kernel: replace mini_fo with overlayfs for 2.6.37

SVN-Revision: 26209

15 files changed, 2995 insertions, 8490 deletions

diff --git a/target/linux/generic/config-2.6.37 b/target/linux/generic/config-2.6.37
index d225c6a1af..949294720e 100644
--- a/target/linux/generic/config-2.6.37
+++ b/target/linux/generic/config-2.6.37
@@ -582,8 +582,9 @@ CONFIG_EXPERIMENTAL=y
 # CONFIG_EXT3_FS_XATTR is not set
 # CONFIG_EXT4_DEBUG is not set
 # CONFIG_EXT4_FS is not set
+# CONFIG_EXT4_FS_POSIX_ACL is not set
 # CONFIG_EXT4_FS_SECURITY is not set
-# CONFIG_EXT4_FS_XATTR is not set
+CONFIG_EXT4_FS_XATTR=y
 CONFIG_EXT4_USE_FOR_EXT23=y
 CONFIG_EXTRA_FIRMWARE=""
 CONFIG_EXTRA_TARGETS=""
@@ -1122,9 +1123,11 @@ CONFIG_JFFS2_CMODE_PRIORITY=y
 CONFIG_JFFS2_COMPRESSION_OPTIONS=y
 CONFIG_JFFS2_FS=y
 CONFIG_JFFS2_FS_DEBUG=0
+# CONFIG_JFFS2_FS_POSIX_ACL is not set
+# CONFIG_JFFS2_FS_SECURITY is not set
 # CONFIG_JFFS2_FS_WBUF_VERIFY is not set
 CONFIG_JFFS2_FS_WRITEBUFFER=y
-# CONFIG_JFFS2_FS_XATTR is not set
+CONFIG_JFFS2_FS_XATTR=y
 CONFIG_JFFS2_LZMA=y
 # CONFIG_JFFS2_LZO is not set
 CONFIG_JFFS2_RTIME=y
@@ -1301,7 +1304,6 @@ CONFIG_MII=y
 # CONFIG_MIKROTIK_RB532 is not set
 # CONFIG_MINIX_FS is not set
 # CONFIG_MINIX_SUBPARTITION is not set
-CONFIG_MINI_FO=y
 # CONFIG_MIPS_ALCHEMY is not set
 # CONFIG_MIPS_COBALT is not set
 # CONFIG_MIPS_FPU_EMU is not set
@@ -1715,6 +1717,7 @@ CONFIG_NLS_DEFAULT="iso8859-1"
 # CONFIG_OMFS_FS is not set
 # CONFIG_ORION_WATCHDOG is not set
 # CONFIG_OSF_PARTITION is not set
+CONFIG_OVERLAYFS_FS=y
 # CONFIG_P54_COMMON is not set
 CONFIG_PACKET=y
 # CONFIG_PAGE_POISONING is not set
diff --git a/target/linux/generic/patches-2.6.37/209-mini_fo.patch b/target/linux/generic/patches-2.6.37/209-mini_fo.patch
deleted file mode 100644
index 065f186d5b..0000000000
--- a/target/linux/generic/patches-2.6.37/209-mini_fo.patch
+++ /dev/null
@@ -1,7786 +0,0 @@
---- a/fs/Kconfig
-+++ b/fs/Kconfig
-@@ -183,6 +183,7 @@ source "fs/logfs/Kconfig"
- source "fs/cramfs/Kconfig"
- source "fs/squashfs/Kconfig"
- source "fs/freevxfs/Kconfig"
-+source "fs/mini_fo/Kconfig"
- source "fs/minix/Kconfig"
- source "fs/omfs/Kconfig"
- source "fs/hpfs/Kconfig"
---- a/fs/Makefile
-+++ b/fs/Makefile
-@@ -74,6 +74,7 @@ obj-$(CONFIG_SQUASHFS)		+= squashfs/
- obj-y				+= ramfs/
- obj-$(CONFIG_HUGETLBFS)		+= hugetlbfs/
- obj-$(CONFIG_CODA_FS)		+= coda/
-+obj-$(CONFIG_MINI_FO)		+= mini_fo/
- obj-$(CONFIG_MINIX_FS)		+= minix/
- obj-$(CONFIG_FAT_FS)		+= fat/
- obj-$(CONFIG_BFS_FS)		+= bfs/
---- /dev/null
-+++ b/fs/mini_fo/aux.c
-@@ -0,0 +1,577 @@
-+/*
-+ * Copyright (c) 1997-2003 Erez Zadok
-+ * Copyright (c) 2001-2003 Stony Brook University
-+ *
-+ * For specific licensing information, see the COPYING file distributed with
-+ * this package, or get one from ftp://ftp.filesystems.org/pub/fist/COPYING.
-+ *
-+ * This Copyright notice must be kept intact and distributed with all
-+ * fistgen sources INCLUDING sources generated by fistgen.
-+ */
-+/*
-+ * Copyright (C) 2004, 2005 Markus Klotzbuecher <mk@creamnet.de>
-+ *
-+ * This program is free software; you can redistribute it and/or
-+ * modify it under the terms of the GNU General Public License
-+ * as published by the Free Software Foundation; either version
-+ * 2 of the License, or (at your option) any later version.
-+ */
-+/*
-+ *  $Id$
-+ */
-+
-+#ifdef HAVE_CONFIG_H
-+# include <config.h>
-+#endif
-+
-+#include "fist.h"
-+#include "mini_fo.h"
-+
-+/* check if file exists in storage  */
-+int exists_in_storage(dentry_t *dentry)
-+{
-+	check_mini_fo_dentry(dentry);
-+	if(dtost(dentry) == MODIFIED || dtost(dentry) == CREATED || dtost(dentry) == DEL_REWRITTEN)
-+		return 1;
-+	return 0;
-+}
-+
-+/* check if dentry is in an existing state */
-+int is_mini_fo_existant(dentry_t *dentry)
-+{
-+	check_mini_fo_dentry(dentry);
-+
-+	if(dtost(dentry) == DELETED || dtost(dentry) == NON_EXISTANT)
-+		return 0;
-+	else
-+		return 1;
-+}
-+
-+/*
-+ * This function will create a negative storage dentry for
-+ * dentry, what is required for many create like options.
-+ * It will create the storage structure if necessary.
-+ */
-+int get_neg_sto_dentry(dentry_t *dentry)
-+{
-+	int err = 0;
-+	unsigned int len;
-+	const unsigned char *name;
-+
-+	if(!dentry ||
-+	   !dtopd(dentry) ||
-+	   !(dtost(dentry) == UNMODIFIED ||
-+	     dtost(dentry) == NON_EXISTANT ||
-+	     dtost(dentry) == DELETED)) {
-+		printk(KERN_CRIT "mini_fo: get_neg_sto_dentry: invalid dentry passed.\n");
-+		err = -1;
-+		goto out;
-+	}
-+	/* Have we got a neg. dentry already? */
-+	if(dtohd2(dentry)) {
-+		err = 0;
-+		goto out;
-+	}
-+	if(dtost(dentry->d_parent) == UNMODIFIED) {
-+		/* build sto struct */
-+		err = build_sto_structure(dentry->d_parent->d_parent, dentry->d_parent);
-+		if(err ||
-+		   dtost(dentry->d_parent) != MODIFIED) {
-+			printk(KERN_CRIT "mini_fo: get_neg_sto_dentry: ERROR building sto structure.\n");
-+			err = -1;
-+			goto out;
-+		}
-+	}
-+
-+	len = dentry->d_name.len;
-+	name = dentry->d_name.name;
-+
-+	dtohd2(dentry) =
-+		lookup_one_len(name, dtohd2(dentry->d_parent), len);
-+
-+ out:
-+	return err;
-+}
-+
-+int check_mini_fo_dentry(dentry_t *dentry)
-+{
-+ 	ASSERT(dentry != NULL);
-+	ASSERT(dtopd(dentry) != NULL);
-+	ASSERT((dtohd(dentry) != NULL) || (dtohd2(dentry) != NULL));
-+
-+/* 	if(dtost(dentry) == MODIFIED) { */
-+/* 		ASSERT(dentry->d_inode != NULL); */
-+/* 		ASSERT(dtohd(dentry) != NULL); */
-+/* 		ASSERT(dtohd(dentry)->d_inode != NULL); */
-+/* 		ASSERT(dtohd2(dentry) != NULL); */
-+/* 		ASSERT(dtohd2(dentry)->d_inode != NULL); */
-+/* 	} */
-+/* 	else if(dtost(dentry) == UNMODIFIED) { */
-+/* 		ASSERT(dentry->d_inode != NULL); */
-+/* 		ASSERT( */
-+/* 	} */
-+	return 0;
-+}
-+
-+int check_mini_fo_file(file_t *file)
-+{
-+	ASSERT(file != NULL);
-+	ASSERT(ftopd(file) != NULL);
-+	ASSERT(file->f_dentry != NULL);
-+
-+	/* violent checking, check depending of state and type
-+	 *	if(S_ISDIR(file->f_dentry->d_inode->i_mode)) {}
-+	 */
-+	ASSERT((ftohf(file) != NULL) || (ftohf2(file) != NULL));
-+	return 0;
-+}
-+
-+int check_mini_fo_inode(inode_t *inode)
-+{
-+	ASSERT(inode != NULL);
-+	ASSERT(itopd(inode) != NULL);
-+	ASSERT((itohi(inode) != NULL) || (itohi2(inode) != NULL));
-+	return 0;
-+}
-+
-+/*
-+ * will walk a base path as provided by get_mini_fo_bpath and return
-+ * the (hopefully ;-) ) positive dentry of the renamed base dir.
-+ *
-+ * This does some work of path_init.
-+ */
-+dentry_t *bpath_walk(super_block_t *sb, char *bpath)
-+{
-+	int err;
-+        struct vfsmount *mnt;
-+	struct nameidata nd;
-+
-+	/* be paranoid */
-+	if(!bpath || bpath[0] != '/') {
-+		printk(KERN_CRIT "mini_fo: bpath_walk: Invalid string.\n");
-+		return NULL;
-+	}
-+	if(!sb || !stopd(sb)) {
-+		printk(KERN_CRIT "mini_fo: bpath_walk: Invalid sb.\n");
-+		return NULL;
-+	}
-+
-+	/* fix this: how do I reach this lock?
-+	 * read_lock(&current->fs->lock); */
-+	mnt = mntget(stopd(sb)->hidden_mnt);
-+	/* read_unlock(&current->fs->lock); */
-+
-+	err = vfs_path_lookup(mnt->mnt_root, mnt, bpath+1, 0, &nd);
-+
-+	/* validate */
-+	if (err || !nd.dentry || !nd.dentry->d_inode) {
-+		printk(KERN_CRIT "mini_fo: bpath_walk: path_walk failed.\n");
-+		return NULL;
-+	}
-+	return nd.dentry;
-+}
-+
-+
-+/* returns the full path of the basefile incl. its name */
-+int get_mini_fo_bpath(dentry_t *dentry, char **bpath, int *bpath_len)
-+{
-+	char *buf_walker;
-+	int len = 0;
-+	dentry_t *sky_walker;
-+
-+	if(!dentry || !dtohd(dentry)) {
-+		printk(KERN_CRIT "mini_fo: get_mini_fo_bpath: invalid dentry passed.\n");
-+		return -1;
-+	}
-+	sky_walker = dtohd(dentry);
-+
-+	do {
-+		len += sky_walker->d_name.len + 1 ; /* 1 for '/' */
-+		sky_walker = sky_walker->d_parent;
-+	} while(sky_walker != stopd(dentry->d_inode->i_sb)->base_dir_dentry);
-+
-+	/* 1 to oil the loop */
-+	*bpath = (char*)  kmalloc(len + 1, GFP_KERNEL);
-+	if(!*bpath) {
-+		printk(KERN_CRIT "mini_fo: get_mini_fo_bpath: out of mem.\n");
-+		return -1;
-+	}
-+	buf_walker = *bpath+len; /* put it on last char */
-+	*buf_walker = '\n';
-+	sky_walker = dtohd(dentry);
-+
-+	do {
-+		buf_walker -= sky_walker->d_name.len;
-+		strncpy(buf_walker,
-+			sky_walker->d_name.name,
-+			sky_walker->d_name.len);
-+		*(--buf_walker) = '/';
-+		sky_walker = sky_walker->d_parent;
-+	} while(sky_walker != stopd(dentry->d_inode->i_sb)->base_dir_dentry);
-+
-+	/* bpath_len doesn't count newline! */
-+	*bpath_len = len;
-+ 	return 0;
-+}
-+
-+int mini_fo_cp_cont(dentry_t *tgt_dentry, struct vfsmount *tgt_mnt,
-+		    dentry_t *src_dentry, struct vfsmount *src_mnt)
-+{
-+	void *buf;
-+	mm_segment_t old_fs;
-+	file_t *tgt_file;
-+	file_t *src_file;
-+	int bytes, len, tmp, err;
-+	err = 0;
-+
-+	if(!(tgt_dentry->d_inode && src_dentry->d_inode)) {
-+		printk(KERN_CRIT "mini_fo_cp_cont: ERROR, neg. dentry passed.\n");
-+		err = -EINVAL;
-+		goto out;
-+	}
-+
-+	dget(tgt_dentry);
-+	dget(src_dentry);
-+	mntget(tgt_mnt);
-+	mntget(src_mnt);
-+
-+	/* open file write only */
-+	tgt_file = dentry_open(tgt_dentry, tgt_mnt, 0x1);
-+	if(!tgt_file || IS_ERR(tgt_file)) {
-+		printk(KERN_CRIT "mini_fo_cp_cont: ERROR opening target file.\n");
-+		err = PTR_ERR(tgt_file);
-+		goto out_err;
-+	}
-+
-+	/* open file read only */
-+	src_file = dentry_open(src_dentry, src_mnt, 0x0);
-+	if(!src_file || IS_ERR(src_file)) {
-+		printk(KERN_CRIT "mini_fo_cp_cont: ERROR opening source file.\n");
-+		err = PTR_ERR(src_file);
-+
-+		/* close target file */
-+		fput(tgt_file);
-+		goto out_err;
-+	}
-+
-+	/* check if the filesystem(s) support read respective write */
-+	if(!src_file->f_op->read || !tgt_file->f_op->write) {
-+		printk(KERN_CRIT "mini_fo_cp_cont: ERROR, no fs read or write support.\n");
-+		err = -EPERM;
-+		goto out_close;
-+	}
-+
-+	/* allocate a page for transfering the data */
-+	buf = (void *) __get_free_page(GFP_KERNEL);
-+	if(!buf) {
-+		printk(KERN_CRIT "mini_fo_cp_cont: ERROR, out of kernel mem.\n");
-+		goto out_err;
-+	}
-+
-+	tgt_file->f_pos = 0;
-+	src_file->f_pos = 0;
-+
-+	old_fs = get_fs();
-+	set_fs(KERNEL_DS);
-+
-+	/* Doing this I assume that a read operation will return a full
-+	 * buffer while there is still data to read, and a less than
-+	 * full buffer when all data has been read.
-+	 */
-+	bytes = len = PAGE_SIZE;
-+	while(bytes == len) {
-+		bytes = src_file->f_op->read(src_file, buf, len,
-+					     &src_file->f_pos);
-+		tmp = tgt_file->f_op->write(tgt_file, buf, bytes,
-+					    &tgt_file->f_pos);
-+		if(tmp != bytes) {
-+			printk(KERN_CRIT "mini_fo_cp_cont: ERROR writing.\n");
-+			goto out_close_unset;
-+		}
-+	}
-+
-+	free_page((unsigned long) buf);
-+	set_fs(old_fs);
-+	fput(tgt_file);
-+	fput(src_file);
-+	goto out;
-+
-+ out_close_unset:
-+	free_page((unsigned long) buf);
-+	set_fs(old_fs);
-+
-+ out_close:
-+	fput(tgt_file);
-+	fput(src_file);
-+
-+ out_err:
-+	dput(tgt_dentry);
-+	dput(src_dentry);
-+
-+	/* mk: not sure if this need to be done */
-+	mntput(tgt_mnt);
-+	mntput(src_mnt);
-+
-+ out:
-+	return err;
-+}
-+
-+/* mk:
-+ * ndl (no-duplicate list) stuff
-+ * This is used in mini_fo_readdir, to save the storage directory contents
-+ * and later when reading base, match them against the list in order
-+ * to avoid duplicates.
-+ */
-+
-+/* add a file specified by name and len to the ndl
-+ * Return values: 0 on success, <0 on failure.
-+ */
-+int ndl_add_entry(struct readdir_data *rd, const char *name, int len)
-+{
-+	struct ndl_entry *tmp_entry;
-+
-+	tmp_entry = (struct ndl_entry *)
-+		kmalloc(sizeof(struct ndl_entry), GFP_KERNEL);
-+	if(!tmp_entry) {
-+                printk(KERN_CRIT "mini_fo: ndl_add_entry: out of mem.\n");
-+                return -ENOMEM;
-+        }
-+        tmp_entry->name = (char*) kmalloc(len, GFP_KERNEL);
-+        if(!tmp_entry->name) {
-+                printk(KERN_CRIT "mini_fo: ndl_add_entry: out of mem.\n");
-+                return -ENOMEM;
-+        }
-+	strncpy(tmp_entry->name, name, len);
-+        tmp_entry->len = len;
-+
-+        list_add(&tmp_entry->list, &rd->ndl_list);
-+        rd->ndl_size++;
-+        return 0;
-+}
-+
-+/* delete all list entries and free memory */
-+void ndl_put_list(struct readdir_data *rd)
-+{
-+	struct list_head *tmp;
-+	struct ndl_entry *tmp_entry;
-+
-+	if(rd->ndl_size <= 0)
-+		return;
-+	while(!list_empty(&rd->ndl_list)) {
-+		tmp = rd->ndl_list.next;
-+                list_del(tmp);
-+                tmp_entry = list_entry(tmp, struct ndl_entry, list);
-+		kfree(tmp_entry->name);
-+                kfree(tmp_entry);
-+        }
-+	rd->ndl_size = 0;
-+}
-+
-+/* Check if a file specified by name and len is in the ndl
-+ * Return value: 0 if not in list, 1 if file is found in ndl.
-+ */
-+int ndl_check_entry(struct readdir_data *rd, const char *name, int len)
-+{
-+	struct list_head *tmp;
-+	struct ndl_entry *tmp_entry;
-+
-+	if(rd->ndl_size <= 0)
-+		return 0;
-+
-+	list_for_each(tmp, &rd->ndl_list) {
-+                tmp_entry = list_entry(tmp, struct ndl_entry, list);
-+                if(tmp_entry->len != len)
-+                        continue;
-+                if(!strncmp(tmp_entry->name, name, len))
-+                        return 1;
-+        }
-+        return 0;
-+}
-+
-+/* mk:
-+ * Recursive function to create corresponding directorys in the storage fs.
-+ * The function will build the storage directorys up to dentry.
-+ */
-+int build_sto_structure(dentry_t *dir, dentry_t *dentry)
-+{
-+	int err;
-+	dentry_t *hidden_sto_dentry;
-+	dentry_t *hidden_sto_dir_dentry;
-+
-+	if(dentry->d_parent != dir) {
-+		printk(KERN_CRIT "mini_fo: build_sto_structure: invalid parameter or meta data corruption [1].\n");
-+		return 1;
-+	}
-+
-+       	if(dtost(dir) != MODIFIED) {
-+		err = build_sto_structure(dir->d_parent, dentry->d_parent);
-+		if(err)
-+			return err;
-+	}
-+
-+	/* ok, coming back again. */
-+	check_mini_fo_dentry(dentry);
-+	hidden_sto_dentry = dtohd2(dentry);
-+
-+	if(!hidden_sto_dentry) {
-+		/*
-+		 * This is the case after creating the first
-+		 * hidden_sto_dentry.
-+		 * After one negative storage_dentry, all pointers to
-+		 * hidden_storage dentries are set to NULL. We need to
-+		 * create the negative dentry before we create the storage
-+		 * file.
-+		 */
-+		unsigned int len;
-+		const unsigned char *name;
-+		len = dtohd(dentry)->d_name.len;
-+		name = dtohd(dentry)->d_name.name;
-+		hidden_sto_dentry = lookup_one_len(name, dtohd2(dir), len);
-+		dtohd2(dentry) = hidden_sto_dentry;
-+	}
-+
-+	/* was:	hidden_sto_dir_dentry = lock_parent(hidden_sto_dentry); */
-+	hidden_sto_dir_dentry = dget(hidden_sto_dentry->d_parent);
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+	mutex_lock(&hidden_sto_dir_dentry->d_inode->i_mutex);
-+#else
-+	down(&hidden_sto_dir_dentry->d_inode->i_sem);
-+#endif
-+	/* lets be safe */
-+	if(dtohd2(dir) != hidden_sto_dir_dentry) {
-+		printk(KERN_CRIT "mini_fo: build_sto_structure: invalid parameter or meta data corruption [2].\n");
-+		return 1;
-+	}
-+
-+	/* check for errors in lock_parent */
-+	err = PTR_ERR(hidden_sto_dir_dentry);
-+	if(IS_ERR(hidden_sto_dir_dentry)) {
-+		printk(KERN_CRIT "mini_fo: build_sto_structure: lock_parent failed.\n");
-+		return err;
-+	}
-+
-+	err = vfs_mkdir(hidden_sto_dir_dentry->d_inode,
-+			hidden_sto_dentry,
-+			dir->d_inode->i_mode);
-+
-+	if(err) {
-+		printk(KERN_CRIT "mini_fo: build_sto_structure: failed to create storage dir [1].\n");
-+		/* was: unlock_dir(dir); */
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+		mutex_unlock(&dir->d_inode->i_mutex);
-+#else
-+		up(&dir->d_inode->i_sem);
-+#endif
-+		dput(dir);
-+		return err;
-+	}
-+
-+	/* everything ok! */
-+	if(!dtohd2(dentry)->d_inode) {
-+		printk(KERN_CRIT "mini_fo: build_sto_structure: failed to create storage dir [2].\n");
-+		/* was: unlock_dir(dir); */
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+		mutex_unlock(&dir->d_inode->i_mutex);
-+#else
-+		up(&dir->d_inode->i_sem);
-+#endif
-+		dput(dir);
-+		return 1;
-+	}
-+
-+	/* interpose the new inode and set new state */
-+	itohi2(dentry->d_inode) = igrab(dtohd2(dentry)->d_inode);
-+	dtopd(dentry)->state = MODIFIED;
-+
-+	/* initalize the wol list */
-+	itopd(dentry->d_inode)->deleted_list_size = -1;
-+	itopd(dentry->d_inode)->renamed_list_size = -1;
-+	meta_build_lists(dentry);
-+
-+	fist_copy_attr_all(dentry->d_inode, itohi2(dentry->d_inode));
-+	fist_copy_attr_timesizes(dir->d_inode,
-+				 hidden_sto_dir_dentry->d_inode);
-+	dir->d_inode->i_nlink++;
-+	/* was: unlock_dir(hidden_sto_dir_dentry); */
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+	mutex_unlock(&hidden_sto_dir_dentry->d_inode->i_mutex);
-+#else
-+	up(&hidden_sto_dir_dentry->d_inode->i_sem);
-+#endif
-+	dput(hidden_sto_dir_dentry);
-+	return 0;
-+}
-+
-+
-+#if 0 /* unused */
-+
-+/*
-+ * Read "len" bytes from "filename" into "buf".
-+ * "buf" is in kernel space.
-+ */
-+int
-+mini_fo_read_file(const char *filename, void *buf, int len)
-+{
-+    file_t *filp;
-+    mm_segment_t oldfs;
-+    int bytes;
-+    /* Chroot? Maybe NULL isn't right here */
-+    filp = filp_open(filename, O_RDONLY, 0);
-+    if (!filp || IS_ERR(filp)) {
-+	printk("mini_fo_read_file err %d\n", (int) PTR_ERR(filp));
-+	return -1;  /* or do something else */
-+    }
-+
-+    if (!filp->f_op->read)
-+	return -2;  /* file(system) doesn't allow reads */
-+
-+    /* now read len bytes from offset 0 */
-+    filp->f_pos = 0;		/* start offset */
-+    oldfs = get_fs();
-+    set_fs(KERNEL_DS);
-+    bytes = filp->f_op->read(filp, buf, len, &filp->f_pos);
-+    set_fs(oldfs);
-+
-+    /* close the file */
-+    fput(filp);
-+
-+    return bytes;
-+}
-+
-+
-+
-+/*
-+ * Write "len" bytes from "buf" to "filename"
-+ * "buf" is in kernel space.
-+ */
-+int
-+mini_fo_write_file(const char *filename, void *buf, int len)
-+{
-+    file_t *filp;
-+    mm_segment_t oldfs;
-+    int bytes;
-+				/* Chroot? Maybe NULL isn't right here */
-+    filp = filp_open(filename, O_RDWR|O_CREAT, 0640);
-+    if (!filp || IS_ERR(filp)) {
-+	printk("mini_fo_write_file err %d\n", (int) PTR_ERR(filp));
-+	return -1;  /* or do something else */
-+    }
-+
-+    if (!filp->f_op->write)
-+	return -2;  /* file(system) doesn't allow writes */
-+
-+    /* now write len bytes from offset 0 */
-+    filp->f_pos = 0;		/* start offset */
-+    oldfs = get_fs();
-+    set_fs(KERNEL_DS);
-+    bytes = filp->f_op->write(filp, buf, len, &filp->f_pos);
-+    set_fs(oldfs);
-+
-+    /* close the file */
-+    fput(filp);
-+
-+    return bytes;
-+}
-+
-+#endif /* unused */
-+
---- /dev/null
-+++ b/fs/mini_fo/ChangeLog
-@@ -0,0 +1,281 @@
-+2006-01-24  Markus Klotzbuecher  <mk@mary.denx.de>
-+
-+	* Add tons of ugly ifdefs to Ed L. Cashin's mutex patch to
-+          retain backwards compatibility.
-+
-+2006-01-24  Ed L. Cashin <ecashin@coraid.com>
-+
-+	* Support for the new mutex infrastructure
-+	(7892f2f48d165a34b0b8130c8a195dfd807b8cb6)
-+
-+2005-10-15  Markus Klotzbuecher  <mk@localhost.localdomain>
-+
-+	* Bugfix for a serious memory leak in mini_fo_follow_link.
-+
-+2005-09-21  Markus Klotzbuecher  <mk@mary>
-+
-+	* new release 0.6.1
-+
-+	* fix of a compiler warning due to changes in 2.6.13
-+
-+2005-09-21  Klaus Wenninger  <klaus.wenninger@siemens.com>
-+
-+	* file.c: readdir: fix for a bug that caused directory entries
-+          to show up twice when using storage filesystems such as
-+          minixfs or pramfs.
-+
-+2005-06-30  Eric Lammerts <eric@lammerts.org>
-+
-+	* fix for an oops when overwriting a binary thats beeing
-+          executed.
-+
-+2005-06-09    <mk@mary>
-+
-+	* Renamed overlay to mini_fo-overlay.
-+
-+	* Added mini_fo-merge script to allow merging of storage and base
-+	after making modifications.
-+
-+2005-05-22  root  <mk@mary>
-+
-+	* Added overlay script that allows to easily mount mini_fo ontop
-+	of a given base directory
-+
-+2005-05-10    <mk@mary>
-+
-+	* inode.c: xattr functions return -EOPNOSUPP instead of
-+          -ENOSUPP, what confuses "ls -l"
-+
-+	* Changed license from LGPL to GPL.
-+
-+2005-05-08  root  <mk@mary>
-+
-+	* Makefile: clean it up and added make install and make
-+          uninstall.
-+
-+2005-05-06    <mk@mary>
-+
-+	* merged devel branch back to main. [v0-6-0-pre3]
-+
-+	* removed unused files print.c and fist_ioctl. [devel-0-0-18]
-+
-+	* ioctl: removed fist_ioctl stuff, that is not needed for
-+          now.
-+
-+2005-05-03    <mk@mary>
-+
-+	* file.c: simplified mini_fo_open and mini_fo_setattr using
-+          new state changing functions. [devel-0-0-17]
-+
-+	* inode.c: Fixed getattr state bug (see below) in 2.4 function
-+          mini_fo_inode revalidate.
-+
-+	* inode.c: found an other bug in mini_fo_getattr. States are not
-+	  reliable in this function, as a file can be opened, unlinked and
-+	  the getattr function called. This results in a deleted dentry
-+	  with an inode. Fix is to ignore states and simply use the inode
-+	  available.
-+
-+2005-04-29    <mk@mary>
-+
-+	* file.c: Bugfix and cleanup in fasync and fsync. [devel-0-0-16]
-+
-+	* file.c: do not use mini_fo_lock so the generic version is
-+          used (I guess).
-+
-+	* inode.c: getattr, never call getattr on lower files, as this
-+          will cause the inum to change.
-+
-+	* inode.c: rename_reg_file renamed to rename_nondir, as it
-+          doesn't matter as long it't not a dir. Removed all
-+          rename_dev_file etc.
-+
-+	* tagged as devel-0-0-15
-+
-+	* inode.c: added support for chosing support for extended
-+          attrs at compile time by XATTR define in mini_fo.h .
-+
-+	* inode.c: fixed mini_fo_getattr to use mini_fo inode and not
-+          lower again, what avoids inode number changes that confused
-+          rm again. This is the proper solution.
-+
-+2005-04-24    <mk@mary>
-+
-+	* all files: updated Copyright notive to 2005. [devel-0-0-14]
-+
-+	* inode.c: fixed mini_fo_getattr to not change the inode
-+          number, even if lower files change.
-+
-+	* super.c: fixed a bug that caused deleted base file to show
-+          up suddenly after some time, or after creating a special
-+          file. The problem was that after some time or after special
-+          file creating sync_sb_inodes is called by the vfs, that
-+          called our mini_fo_put_inode. There was (wrongly) called
-+          __meta_put_lists, that nuked the lists, although the inode
-+          was going to continue its life. Moving __meta_put_lists to
-+          mini_fo_clear_inode, where an inode is really destroyed,
-+          solved the problem.
-+
-+
-+2005-04-23    <mk@mary>
-+
-+	* state.c, aux.c: more cleaning up and
-+          simplifications. [devel-0-0-13]
-+
-+	* inode.c: implemented mini_fo_getattr, that was required for
-+          2.6 because inode_revalidate has been remove there, and the
-+	  old "du" bug returned.
-+
-+
-+2005-04-20    <mk@mary>
-+
-+	* aux.c: get_neg_sto_dentry(): allow to be called for dentries
-+          in state UNMODIFIED, NON_EXISTANT _and_ DELETED.
-+
-+2005-04-19    <mk@mary>
-+
-+	* Fixed a bug under 2.6 that caused files deleted via mini_fo
-+          not to be deleted properly and therefore the fs filled up
-+          untill no memory was left. [devel-0-0-12]
-+
-+	* Added basic hard link support. This means that creating
-+          hardlinks will work, but existing ones will be treated as
-+          individual files. [devel-0-0-11]
-+
-+2005-04-17    <mk@mary>
-+
-+	* Bugfixes
-+
-+2005-04-13  root  <mk@mary>
-+
-+	* Added file state.c for the state transition
-+          functions. Doesn't work very well yet, though...
-+
-+2005-04-12    <mk@mary>
-+
-+	* Porting to 2.6 started, which is easier than expected, also
-+          due to Olivier previous work.
-+
-+2005-04-08    <mk@mary>
-+
-+	* Fixed the bug that caused du to return invalid sizes of
-+          directory trees. The problem was that
-+          mini_fo_inode_revalidate didn't always copy the attributes
-+          from the base inode properly.
-+
-+2005-04-01  Markus Klotzbuecher  <mk@chasey>
-+
-+	* Merged devel branch back to main trunk and updated the
-+          RELEASE notes. This will be 0-6-0-pre1.
-+
-+2005-03-31  Markus Klotzbuecher  <mk@chasey>
-+
-+	* Fixed some bugs in rename_reg_file, that only showed up in
-+          the kernel compile test. Kernel compiles cleanly ontop of
-+          mini_fo, now also make mrproper etc. work. Seems pretty stable.
-+
-+2005-03-28  Markus Klotzbuecher  <mk@chasey>
-+
-+	* Many, many directory renaming bugfixes and a lot of other
-+          cleanup. Dir renaming seems to work relatively stable.
-+
-+2005-03-22  Markus Klotzbuecher  <mk@chasey>
-+
-+	* Finished implementing lightweight directory renaming. Some
-+          basic testing indicates it works fine.
-+	  Next is to implement testcases for the testsuite and confirm
-+          everything is really working ok.
-+
-+2005-03-18  Markus Klotzbuecher  <mk@chasey>
-+
-+	* Finished implementing meta.c stuff required for directory
-+          renaming.
-+
-+2005-03-17  Markus Klotzbuecher  <mk@chasey>
-+
-+	* Fixed all compile warnings + an extremly old bug that
-+          somehow crept in while reworking the wol stuff to the META
-+          system. Turning on -Werror again... :-)
-+
-+	* Fixed some bugs in the new rename_reg_file function.
-+
-+	* Rewrote mini_fo rename and split it into several
-+          subfunctions, that handle the different types
-+          seperately. Rewrote the regular file function aswell, as it
-+          was implemented somewhat inefficient.
-+
-+2005-03-16  Markus Klotzbuecher  <mk@chasey>
-+
-+	* Implemented new META subsystem, removed old WOL stuff in favor
-+	  if it.
-+
-+	* After some basic testing everything seems ok...
-+
-+2005-03-11  Markus Klotzbuecher  <mk@chasey>
-+
-+	* Renaming a non regular file caused trouble because I always
-+	  tried to copy the contents. Now I only do this for regular
-+	  files. mini_fo_rename still isn't implemented properly, renaming
-+	  of device files, symlinks etc. results in a empty regular file
-+	  instead of the proper type.
-+
-+	* Directory renaming suddenly works! What a surprise! I guess
-+          this is because renaming is implemented as making a copy and
-+          removing the original. Still this might not work
-+          everywhere...
-+
-+2005-03-09  Markus Klotzbuecher  <mk@chasey>
-+
-+	* Bugfix, when a mini_fo directory that exists in storage
-+  	  (state: MODIFIED, CREATED and DEL_REWRITTEN) is deleted, a
-+  	  possibly existing WOL file contained in it needs to be
-+  	  deleted too.
-+
-+	* Starting cleanup: defined state names in order to get rid of
-+          the state numbers.
-+
-+2005-03-08  Markus Klotzbuecher  <mk@chasey>
-+
-+	* Makefile fix, fist_ioctl was built against wrong sources if ARCH=um
-+
-+	* Fixed a bug in dentry.c, mini_fo_d_hash. In state 4 =
-+          DEL_REWRITTEN the hash was calculated from the base dentry,
-+          which was wrong and and caused assertions in
-+          __mini_fo_hidden_dentry to fail.
-+
-+2005-02-21    <mk@mary>
-+
-+	* Implemented directory deleting (inode.c)
-+
-+	* main.c: made mini_fo_parse_options a little more robust.
-+
-+2004-12-22    <mk@mary>
-+
-+	* Makefile cleanup and uml stuff, removed unneccessary files
-+
-+	* Created a new and hopefully more informative README
-+
-+	* CHANGELOG: created a new CHANGELOG and added old entries reversely
-+
-+
-+2004-10-24 Gleb Natapov <gleb@nbase.co.il>
-+
-+	* Fix: owner and group where not correctly copied from base to
-+          storage.
-+
-+
-+2004-10-05 Gleb Natapov <gleb@nbase.co.il>
-+
-+	* Implementation of fsync, fasync and lock mini_fo functions.
-+
-+
-+2004-09-29 Bob Lee <bob@pantasys.com>
-+
-+	* Fix of a serious pointer bug
-+
-+
-+2004-09-28 Gleb Natapov <gleb@nbase.co.il>
-+
-+	* Implementation of mini_fo_mknod and mini_fo_rename, support
-+          for device files.
-+
---- /dev/null
-+++ b/fs/mini_fo/dentry.c
-@@ -0,0 +1,244 @@
-+/*
-+ * Copyright (c) 1997-2003 Erez Zadok
-+ * Copyright (c) 2001-2003 Stony Brook University
-+ *
-+ * For specific licensing information, see the COPYING file distributed with
-+ * this package, or get one from ftp://ftp.filesystems.org/pub/fist/COPYING.
-+ *
-+ * This Copyright notice must be kept intact and distributed with all
-+ * fistgen sources INCLUDING sources generated by fistgen.
-+ */
-+/*
-+ * Copyright (C) 2004, 2005 Markus Klotzbuecher <mk@creamnet.de>
-+ *
-+ * This program is free software; you can redistribute it and/or
-+ * modify it under the terms of the GNU General Public License
-+ * as published by the Free Software Foundation; either version
-+ * 2 of the License, or (at your option) any later version.
-+ */
-+
-+/*
-+ *  $Id$
-+ */
-+
-+#ifdef HAVE_CONFIG_H
-+# include <config.h>
-+#endif
-+
-+#include "fist.h"
-+#include "mini_fo.h"
-+
-+/*
-+ * THIS IS A BOOLEAN FUNCTION: returns 1 if valid, 0 otherwise.
-+ */
-+STATIC int
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+mini_fo_d_revalidate(dentry_t *dentry, struct nameidata *nd)
-+#else
-+mini_fo_d_revalidate(dentry_t *dentry, int flags)
-+#endif
-+{
-+	int err1 = 1; /* valid = 1, invalid = 0 */
-+	int err2 = 1;
-+	dentry_t *hidden_dentry;
-+	dentry_t *hidden_sto_dentry;
-+
-+
-+	check_mini_fo_dentry(dentry);
-+
-+	hidden_dentry  = dtohd(dentry);
-+	hidden_sto_dentry = dtohd2(dentry);
-+
-+	if(hidden_dentry &&
-+	   hidden_dentry->d_op &&
-+	   hidden_dentry->d_op->d_revalidate) {
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+		err1 = hidden_dentry->d_op->d_revalidate(hidden_dentry, nd);
-+#else
-+		err1 = hidden_dentry->d_op->d_revalidate(hidden_dentry, flags);
-+#endif
-+	}
-+	if(hidden_sto_dentry &&
-+	   hidden_sto_dentry->d_op &&
-+	   hidden_sto_dentry->d_op->d_revalidate) {
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+		err2 = hidden_sto_dentry->d_op->d_revalidate(hidden_sto_dentry,
-+							     nd);
-+#else
-+		err2 = hidden_sto_dentry->d_op->d_revalidate(hidden_sto_dentry,
-+							     flags);
-+#endif
-+	}
-+
-+	/* mk: if one of the lower level dentries are valid,
-+	 * the mini_fo dentry is too.
-+	 */
-+	return (err1 || err2);
-+}
-+
-+
-+STATIC int
-+mini_fo_d_hash(dentry_t *dentry, qstr_t *name)
-+{
-+	int err = 0;
-+	dentry_t *hidden_dentry;
-+	dentry_t *hidden_sto_dentry;
-+
-+	/* hidden_dentry = mini_fo_hidden_dentry(dentry);
-+	 * hidden_sto_dentry = mini_fo_hidden_sto_dentry(dentry); */
-+
-+	/* state 1, 3, 4, 5: build the hash for the storage dentry */
-+	if((dtopd(dentry)->state == MODIFIED) ||
-+	   (dtopd(dentry)->state == CREATED) ||
-+	   (dtopd(dentry)->state == DEL_REWRITTEN) ||
-+	   (dtopd(dentry)->state == DELETED)) {
-+		hidden_sto_dentry = dtohd2(dentry);
-+		if(hidden_sto_dentry &&
-+		   hidden_sto_dentry->d_op &&
-+		   hidden_sto_dentry->d_op->d_hash) {
-+			err = hidden_sto_dentry->d_op->d_hash(hidden_sto_dentry, name);
-+		}
-+		goto out;
-+	}
-+	/* state 2: build the hash for the base dentry */
-+	if(dtopd(dentry)->state == UNMODIFIED) {
-+		hidden_dentry = dtohd(dentry);
-+		if(hidden_dentry &&
-+		   hidden_dentry->d_op &&
-+		   hidden_dentry->d_op->d_hash) {
-+			err = hidden_dentry->d_op->d_hash(hidden_dentry, name);
-+		}
-+		goto out;
-+	}
-+	/* state 6: build hash for the dentry that exists */
-+	if(dtopd(dentry)->state == NON_EXISTANT) {
-+		hidden_sto_dentry = dtohd2(dentry);
-+		if(hidden_sto_dentry &&
-+		   hidden_sto_dentry->d_op &&
-+		   hidden_sto_dentry->d_op->d_hash) {
-+			err = hidden_sto_dentry->d_op->d_hash(hidden_sto_dentry, name);
-+			goto out;
-+		}
-+		hidden_dentry = dtohd(dentry);
-+		if(hidden_dentry &&
-+		   hidden_dentry->d_op &&
-+		   hidden_dentry->d_op->d_hash) {
-+			err = hidden_dentry->d_op->d_hash(hidden_dentry, name);
-+			goto out;
-+		}
-+	}
-+
-+	printk(KERN_CRIT "mini_fo: d_hash: invalid state detected.\n");
-+
-+ out:
-+	return err;
-+}
-+
-+
-+STATIC int
-+mini_fo_d_compare(dentry_t *dentry, qstr_t *a, qstr_t *b)
-+{
-+	int err;
-+	dentry_t *hidden_dentry=NULL;
-+
-+	/* hidden_dentry = mini_fo_hidden_dentry(dentry); */
-+	if(dtohd2(dentry))
-+		hidden_dentry = dtohd2(dentry);
-+	else if(dtohd(dentry))
-+		hidden_dentry = dtohd(dentry);
-+
-+	if (hidden_dentry && hidden_dentry->d_op && hidden_dentry->d_op->d_compare) {
-+		err = hidden_dentry->d_op->d_compare(hidden_dentry, a, b);
-+	} else {
-+		err = ((a->len != b->len) || memcmp(a->name, b->name, b->len));
-+	}
-+
-+	return err;
-+}
-+
-+
-+int
-+mini_fo_d_delete(dentry_t *dentry)
-+{
-+	dentry_t *hidden_dentry;
-+	dentry_t *hidden_sto_dentry;
-+	int err = 0;
-+
-+	/* this could be a negative dentry, so check first */
-+	if (!dtopd(dentry)) {
-+		printk(KERN_CRIT "mini_fo_d_delete: negative dentry passed.\n");
-+		goto out;
-+	}
-+	hidden_dentry = dtohd(dentry);
-+	hidden_sto_dentry = dtohd2(dentry);
-+
-+	if(hidden_dentry) {
-+		if(hidden_dentry->d_op &&
-+		   hidden_dentry->d_op->d_delete) {
-+			err = hidden_dentry->d_op->d_delete(hidden_dentry);
-+		}
-+	}
-+	if(hidden_sto_dentry) {
-+		if(hidden_sto_dentry->d_op &&
-+		   hidden_sto_dentry->d_op->d_delete) {
-+			err = hidden_sto_dentry->d_op->d_delete(hidden_sto_dentry);
-+		}
-+	}
-+
-+ out:
-+	return err;
-+}
-+
-+
-+void
-+mini_fo_d_release(dentry_t *dentry)
-+{
-+	dentry_t *hidden_dentry;
-+	dentry_t *hidden_sto_dentry;
-+
-+
-+	/* this could be a negative dentry, so check first */
-+	if (!dtopd(dentry)) {
-+		printk(KERN_CRIT "mini_fo_d_release: no private data.\n");
-+		goto out;
-+	}
-+	hidden_dentry = dtohd(dentry);
-+	hidden_sto_dentry = dtohd2(dentry);
-+
-+	if(hidden_dentry) {
-+		/* decrement hidden dentry's counter and free its inode */
-+		dput(hidden_dentry);
-+	}
-+	if(hidden_sto_dentry) {
-+                /* decrement hidden dentry's counter and free its inode */
-+		dput(hidden_sto_dentry);
-+	}
-+
-+	/* free private data (mini_fo_dentry_info) here */
-+	kfree(dtopd(dentry));
-+	__dtopd(dentry) = NULL;	/* just to be safe */
-+ out:
-+	return;
-+}
-+
-+
-+/*
-+ * we don't really need mini_fo_d_iput, because dentry_iput will call iput() if
-+ * mini_fo_d_iput is not defined. We left this implemented for ease of
-+ * tracing/debugging.
-+ */
-+void
-+mini_fo_d_iput(dentry_t *dentry, inode_t *inode)
-+{
-+	iput(inode);
-+}
-+
-+
-+struct dentry_operations mini_fo_dops = {
-+	d_revalidate:	mini_fo_d_revalidate,
-+	d_hash:		mini_fo_d_hash,
-+	d_compare:		mini_fo_d_compare,
-+	d_release:		mini_fo_d_release,
-+	d_delete:		mini_fo_d_delete,
-+	d_iput:		mini_fo_d_iput,
-+};
---- /dev/null
-+++ b/fs/mini_fo/file.c
-@@ -0,0 +1,713 @@
-+/*
-+ * Copyright (c) 1997-2003 Erez Zadok
-+ * Copyright (c) 2001-2003 Stony Brook University
-+ *
-+ * For specific licensing information, see the COPYING file distributed with
-+ * this package, or get one from ftp://ftp.filesystems.org/pub/fist/COPYING.
-+ *
-+ * This Copyright notice must be kept intact and distributed with all
-+ * fistgen sources INCLUDING sources generated by fistgen.
-+ */
-+/*
-+ * Copyright (C) 2004, 2005 Markus Klotzbuecher <mk@creamnet.de>
-+ *
-+ * This program is free software; you can redistribute it and/or
-+ * modify it under the terms of the GNU General Public License
-+ * as published by the Free Software Foundation; either version
-+ * 2 of the License, or (at your option) any later version.
-+ */
-+
-+/*
-+ *  $Id$
-+ */
-+
-+#ifdef HAVE_CONFIG_H
-+# include <config.h>
-+#endif
-+
-+#include "fist.h"
-+#include "mini_fo.h"
-+#define ROUND_UP(x) (((x)+sizeof(long)-1) & ~(sizeof(long)-1))
-+
-+/*******************
-+ * File Operations *
-+ *******************/
-+
-+STATIC loff_t
-+mini_fo_llseek(file_t *file, loff_t offset, int origin)
-+{
-+	loff_t err;
-+	file_t *hidden_file = NULL;
-+
-+	if(S_ISDIR(file->f_dentry->d_inode->i_mode)) {
-+		/* Check if trying to llseek from a directory */
-+		err = -EISDIR;
-+		goto out;
-+	}
-+	if (ftopd(file) != NULL) {
-+		if(ftohf2(file)) {
-+			hidden_file = ftohf2(file);
-+		} else {
-+			hidden_file = ftohf(file);
-+		}
-+	}
-+
-+	/* always set hidden position to this one */
-+	hidden_file->f_pos = file->f_pos;
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+	memcpy(&(hidden_file->f_ra),
-+	       &(file->f_ra),
-+	       sizeof(struct file_ra_state));
-+#else
-+	if (file->f_reada) { /* update readahead information if needed */
-+		hidden_file->f_reada = file->f_reada;
-+		hidden_file->f_ramax = file->f_ramax;
-+		hidden_file->f_raend = file->f_raend;
-+		hidden_file->f_ralen = file->f_ralen;
-+		hidden_file->f_rawin = file->f_rawin;
-+	}
-+#endif
-+	if (hidden_file->f_op && hidden_file->f_op->llseek)
-+		err = hidden_file->f_op->llseek(hidden_file, offset, origin);
-+	else
-+		err = generic_file_llseek(hidden_file, offset, origin);
-+
-+	if (err < 0)
-+		goto out;
-+
-+	if (err != file->f_pos) {
-+		file->f_pos = err;
-+		// ION maybe this?
-+		// 	file->f_pos = hidden_file->f_pos;
-+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
-+		file->f_reada = 0;
-+#endif
-+		file->f_version++;
-+	}
-+
-+ out:
-+	return err;
-+}
-+
-+
-+/* mk: fanout capable */
-+STATIC ssize_t
-+mini_fo_read(file_t *file, char *buf, size_t count, loff_t *ppos)
-+{
-+	int err = -EINVAL;
-+	file_t *hidden_file = NULL;
-+	loff_t pos = *ppos;
-+
-+	if(S_ISDIR(file->f_dentry->d_inode->i_mode)) {
-+		/* Check if trying to read from a directory */
-+		/* printk(KERN_CRIT "mini_fo_read: ERROR: trying to read data from a directory.\n"); */
-+		err = -EISDIR;
-+		goto out;
-+	}
-+
-+	if (ftopd(file) != NULL) {
-+		if(ftohf2(file)) {
-+			hidden_file = ftohf2(file);
-+		} else {
-+			hidden_file = ftohf(file);
-+		}
-+	}
-+
-+	if (!hidden_file->f_op || !hidden_file->f_op->read)
-+		goto out;
-+
-+	err = hidden_file->f_op->read(hidden_file, buf, count, &pos);
-+	*ppos = pos;
-+
-+	if (err >= 0) {
-+		/* atime should also be updated for reads of size zero or more */
-+		fist_copy_attr_atime(file->f_dentry->d_inode,
-+				     hidden_file->f_dentry->d_inode);
-+	}
-+
-+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
-+	/*
-+	 * MAJOR HACK
-+	 * because pread() does not have any way to tell us that it is
-+	 * our caller, then we don't know for sure if we have to update
-+	 * the file positions.  This hack relies on read() having passed us
-+	 * the "real" pointer of its struct file's f_pos field.
-+	 */
-+	if (ppos == &file->f_pos)
-+		hidden_file->f_pos = *ppos = pos;
-+	if (hidden_file->f_reada) { /* update readahead information if needed */
-+		file->f_reada = hidden_file->f_reada;
-+		file->f_ramax = hidden_file->f_ramax;
-+		file->f_raend = hidden_file->f_raend;
-+		file->f_ralen = hidden_file->f_ralen;
-+		file->f_rawin = hidden_file->f_rawin;
-+	}
-+#else
-+	memcpy(&(file->f_ra),&(hidden_file->f_ra),sizeof(struct file_ra_state));
-+#endif
-+
-+ out:
-+	return err;
-+}
-+
-+
-+/* this mini_fo_write() does not modify data pages! */
-+STATIC ssize_t
-+mini_fo_write(file_t *file, const char *buf, size_t count, loff_t *ppos)
-+{
-+	int err = -EINVAL;
-+	file_t *hidden_file = NULL;
-+	inode_t *inode;
-+	inode_t *hidden_inode;
-+	loff_t pos = *ppos;
-+
-+	/* mk: fan out: */
-+	if (ftopd(file) != NULL) {
-+		if(ftohf2(file)) {
-+			hidden_file = ftohf2(file);
-+		} else {
-+			/* This is bad! We have no storage file to write to. This
-+			 * should never happen because if a file is opened for
-+			 * writing, a copy should have been made earlier.
-+			 */
-+			printk(KERN_CRIT "mini_fo: write : ERROR, no storage file to write.\n");
-+			err = -EINVAL;
-+			goto out;
-+		}
-+	}
-+
-+	inode = file->f_dentry->d_inode;
-+	hidden_inode = itohi2(inode);
-+	if(!hidden_inode) {
-+		printk(KERN_CRIT "mini_fo: write: no sto inode found, not good.\n");
-+		goto out;
-+	}
-+
-+	if (!hidden_file->f_op || !hidden_file->f_op->write)
-+		goto out;
-+
-+	/* adjust for append -- seek to the end of the file */
-+	if (file->f_flags & O_APPEND)
-+		pos = inode->i_size;
-+
-+	err = hidden_file->f_op->write(hidden_file, buf, count, &pos);
-+
-+	/*
-+	 * copy ctime and mtime from lower layer attributes
-+	 * atime is unchanged for both layers
-+	 */
-+	if (err >= 0)
-+		fist_copy_attr_times(inode, hidden_inode);
-+
-+	*ppos = pos;
-+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
-+	/*
-+	 * XXX: MAJOR HACK
-+	 *
-+	 * because pwrite() does not have any way to tell us that it is
-+	 * our caller, then we don't know for sure if we have to update
-+	 * the file positions.  This hack relies on write() having passed us
-+	 * the "real" pointer of its struct file's f_pos field.
-+	 */
-+	if (ppos == &file->f_pos)
-+		hidden_file->f_pos = *ppos = pos;
-+#endif
-+	/* update this inode's size */
-+	if (pos > inode->i_size)
-+		inode->i_size = pos;
-+
-+ out:
-+	return err;
-+}
-+
-+/* Global variable to hold a file_t pointer.
-+ * This serves to allow mini_fo_filldir function to know which file is
-+ * beeing read, which is required for two reasons:
-+ *
-+ *   - be able to call wol functions in order to avoid listing deleted
-+ *     base files.
-+ *   - if we're reading a directory which is in state 1, we need to
-+ *     maintain a list (in mini_fo_filldir) of which files allready
-+ *     have been copied to userspace,to detect files existing in base
-+ *     and storage and not list them twice.
-+ */
-+filldir_t mini_fo_filldir_orig;
-+file_t *mini_fo_filldir_file;
-+
-+/* mainly copied from fs/readdir.c */
-+STATIC int
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
-+mini_fo_filldir(void * __buf, const char * name, int namlen, loff_t offset,
-+		  u64 ino, unsigned int d_type)
-+#else
-+mini_fo_filldir(void * __buf, const char * name, int namlen, loff_t offset,
-+		  ino_t ino, unsigned int d_type)
-+#endif
-+{
-+	struct getdents_callback * buf = (struct getdents_callback *) __buf;
-+	file_t* file = mini_fo_filldir_file;
-+
-+	/* In theses states we filter meta files in storage (WOL) */
-+	if(file && (dtopd(file->f_dentry)->state == MODIFIED ||
-+		    dtopd(file->f_dentry)->state == CREATED ||
-+		    dtopd(file->f_dentry)->state == DEL_REWRITTEN)) {
-+
-+		int tmp = strlen(META_FILENAME);
-+		if(tmp  == namlen) {
-+			if(!strncmp(name, META_FILENAME, namlen))
-+				return 0;
-+		}
-+	}
-+
-+	/* check if we are merging the contents of storage and base */
-+	if(file && dtopd(file->f_dentry)->state == MODIFIED) {
-+		/* check if we are still reading storage contents, if
-+		 * yes, we just save the name of the file for duplicate
-+		 * checking later. */
-+
-+		if(!ftopd(file)->rd.sto_done) {
-+			/* put file into ndl list */
-+			if(ndl_add_entry(&ftopd(file)->rd, name, namlen))
-+				printk(KERN_CRIT "mini_fo_filldir: Error adding to ndl.\n");
-+		} else {
-+			/* check if file has been deleted */
-+			if(meta_check_d_entry(file->f_dentry, name, namlen))
-+				return 0;
-+
-+			/* do duplicate checking */
-+			if(ndl_check_entry(&ftopd(file)->rd, name, namlen))
-+				return 0;
-+		}
-+	}
-+
-+	return mini_fo_filldir_orig(buf, name, namlen, offset, ino, d_type);
-+}
-+
-+
-+STATIC int
-+mini_fo_readdir(file_t *file, void *dirent, filldir_t filldir)
-+{
-+	int err = 0;/* mk: ??? -ENOTDIR; */
-+	file_t *hidden_file = NULL;
-+	file_t *hidden_sto_file = NULL;
-+	inode_t *inode;
-+	struct getdents_callback *buf;
-+	int oldcount;
-+
-+#if defined(FIST_FILTER_NAME) || defined(FIST_FILTER_SCA)
-+	struct mini_fo_getdents_callback buf;
-+#endif /* FIST_FILTER_NAME || FIST_FILTER_SCA */
-+
-+	buf = (struct getdents_callback *) dirent;
-+	oldcount = buf->count;
-+	inode = file->f_dentry->d_inode;
-+	mini_fo_filldir_file = file;
-+	mini_fo_filldir_orig = filldir;
-+
-+	ftopd(file)->rd.sto_done = 0;
-+	do {
-+		if (ftopd(file) != NULL) {
-+			if(ftohf2(file)) {
-+				hidden_sto_file = ftohf2(file);
-+				err = vfs_readdir(hidden_sto_file, mini_fo_filldir, dirent);
-+				file->f_pos = hidden_sto_file->f_pos;
-+				if (err > 0)
-+					fist_copy_attr_atime(inode, hidden_sto_file->f_dentry->d_inode);
-+				/* not finshed yet, we'll be called again */
-+				if (buf->count != oldcount)
-+					break;
-+			}
-+
-+			ftopd(file)->rd.sto_done = 1;
-+
-+			if(ftohf(file)) {
-+				hidden_file = ftohf(file);
-+				err = vfs_readdir(hidden_file, mini_fo_filldir, dirent);
-+				file->f_pos = hidden_file->f_pos;
-+				if (err > 0)
-+					fist_copy_attr_atime(inode, hidden_file->f_dentry->d_inode);
-+			}
-+
-+		}
-+	} while (0);
-+
-+	/* mk:
-+	 * we need to check if all the directory data has been copied to userspace,
-+	 * or if we will be called again by userspace to complete the operation.
-+	 */
-+	if(buf->count == oldcount) {
-+		ndl_put_list(&ftopd(file)->rd);
-+	}
-+
-+	/* unset this, safe */
-+	mini_fo_filldir_file = NULL;
-+	return err;
-+}
-+
-+
-+STATIC unsigned int
-+mini_fo_poll(file_t *file, poll_table *wait)
-+{
-+	unsigned int mask = DEFAULT_POLLMASK;
-+	file_t *hidden_file = NULL;
-+
-+	if (ftopd(file) != NULL) {
-+		if(ftohf2(file)) {
-+			hidden_file = ftohf2(file);
-+		} else {
-+			hidden_file = ftohf(file);
-+		}
-+	}
-+
-+	if (!hidden_file->f_op || !hidden_file->f_op->poll)
-+		goto out;
-+
-+	mask = hidden_file->f_op->poll(hidden_file, wait);
-+
-+ out:
-+	return mask;
-+}
-+
-+/* FIST-LITE special version of mmap */
-+STATIC int
-+mini_fo_mmap(file_t *file, vm_area_t *vma)
-+{
-+	int err = 0;
-+	file_t *hidden_file = NULL;
-+
-+	/* fanout capability */
-+	if (ftopd(file) != NULL) {
-+		if(ftohf2(file)) {
-+			hidden_file = ftohf2(file);
-+		} else {
-+			hidden_file = ftohf(file);
-+		}
-+	}
-+
-+	ASSERT(hidden_file != NULL);
-+	ASSERT(hidden_file->f_op != NULL);
-+	ASSERT(hidden_file->f_op->mmap != NULL);
-+
-+	vma->vm_file = hidden_file;
-+	err = hidden_file->f_op->mmap(hidden_file, vma);
-+	get_file(hidden_file); /* make sure it doesn't get freed on us */
-+	fput(file);	       /* no need to keep extra ref on ours */
-+
-+	return err;
-+}
-+
-+
-+
-+STATIC int
-+mini_fo_open(inode_t *inode, file_t *file)
-+{
-+	int err = 0;
-+ 	int hidden_flags;
-+	file_t *hidden_file = NULL;
-+	dentry_t *hidden_dentry = NULL;
-+
-+	/* fanout stuff */
-+	file_t *hidden_sto_file = NULL;
-+	dentry_t *hidden_sto_dentry = NULL;
-+
-+	__ftopd(file) =
-+		kmalloc(sizeof(struct mini_fo_file_info), GFP_KERNEL);
-+	if (!ftopd(file)) {
-+		err = -ENOMEM;
-+		goto out;
-+	}
-+
-+	/* init the readdir_helper structure */
-+	INIT_LIST_HEAD(&ftopd(file)->rd.ndl_list);
-+	ftopd(file)->rd.ndl_size = 0;
-+
-+	/* In certain paths this could stay uninitalized and cause trouble */
-+	ftohf(file) = NULL;
-+	ftohf2(file) = NULL;
-+	hidden_flags = file->f_flags;
-+
-+	/* create storage files? */
-+	if(dtost(file->f_dentry) == UNMODIFIED) {
-+		if(!IS_WRITE_FLAG(file->f_flags)) {
-+			hidden_dentry = dtohd(file->f_dentry);
-+			dget(hidden_dentry);
-+			/* dentry_open will decrement mnt refcnt if err.
-+			 * otherwise fput() will do an mntput() for us upon file close. */
-+			mntget(stopd(inode->i_sb)->hidden_mnt);
-+			hidden_file = dentry_open(hidden_dentry,
-+						  stopd(inode->i_sb)->hidden_mnt,
-+						  hidden_flags);
-+			if (IS_ERR(hidden_file)) {
-+				err = PTR_ERR(hidden_file);
-+				dput(hidden_dentry);
-+				goto out;
-+			}
-+			ftohf(file) = hidden_file;	/* link two files */
-+			goto out;
-+		}
-+		else {
-+			if(S_ISDIR(file->f_dentry->d_inode->i_mode)) {
-+				err = dir_unmod_to_mod(file->f_dentry);
-+			} else
-+				err = nondir_unmod_to_mod(file->f_dentry, 1);
-+
-+			if (err) {
-+				printk("mini_fo_open: ERROR creating storage file.\n");
-+				goto out;
-+			}
-+		}
-+	}
-+	hidden_sto_dentry = dtohd2(file->f_dentry);
-+	dget(hidden_sto_dentry);
-+
-+	if(dtopd(file->f_dentry)->state == MODIFIED) {
-+		/* Directorys are special, interpose on both lower level files */
-+		if(S_ISDIR(itohi(inode)->i_mode)) {
-+			/* check for invalid file types of lower level files */
-+			if(!(S_ISDIR(itohi(inode)->i_mode) && S_ISDIR(itohi2(inode)->i_mode))) {
-+				printk(KERN_CRIT "mini_fo_open: meta data corruption detected.\n");
-+				dput(hidden_sto_dentry);
-+				err = -EINVAL;
-+				goto out;
-+			}
-+
-+			/* lower level directorys are ok, open the base file */
-+			hidden_dentry = dtohd(file->f_dentry);
-+			dget(hidden_dentry);
-+
-+			mntget(stopd(inode->i_sb)->hidden_mnt);
-+			hidden_file = dentry_open(hidden_dentry,
-+						  stopd(inode->i_sb)->hidden_mnt,
-+						  hidden_flags);
-+			if (IS_ERR(hidden_file)) {
-+				err = PTR_ERR(hidden_file);
-+				dput(hidden_dentry);
-+				dput(hidden_sto_dentry);
-+				goto out;
-+			}
-+			ftohf(file) = hidden_file; /* link the two files */
-+		}
-+	}
-+
-+	if(!exists_in_storage(file->f_dentry)) {
-+		printk(KERN_CRIT "mini_fo_open: invalid file state detected.\n");
-+		err = -EINVAL;
-+		dput(hidden_sto_dentry);
-+
-+		/* If the base file has been opened, we need to close it here */
-+		if(ftohf(file)) {
-+			if (hidden_file->f_op && hidden_file->f_op->flush)
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
-+				hidden_file->f_op->flush(hidden_file, NULL);
-+#else
-+				hidden_file->f_op->flush(hidden_file);
-+#endif
-+			dput(hidden_dentry);
-+		}
-+		goto out;
-+	}
-+
-+	/* ok, now we can safely open the storage file */
-+	mntget(stopd(inode->i_sb)->hidden_mnt2);
-+	hidden_sto_file = dentry_open(hidden_sto_dentry,
-+				      stopd(inode->i_sb)->hidden_mnt2,
-+				      hidden_flags);
-+
-+	/* dentry_open dputs the dentry if it fails */
-+	if (IS_ERR(hidden_sto_file)) {
-+		err = PTR_ERR(hidden_sto_file);
-+		/* close base file if open */
-+		if(ftohf(file)) {
-+			if (hidden_file->f_op && hidden_file->f_op->flush)
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
-+				hidden_file->f_op->flush(hidden_file, NULL);
-+#else
-+				hidden_file->f_op->flush(hidden_file);
-+#endif
-+			dput(hidden_dentry);
-+		}
-+		goto out;
-+	}
-+	ftohf2(file) = hidden_sto_file; /* link storage file */
-+
-+ out:
-+	if (err < 0 && ftopd(file)) {
-+		kfree(ftopd(file));
-+	}
-+	return err;
-+}
-+
-+STATIC int
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
-+mini_fo_flush(file_t *file, fl_owner_t id)
-+#else
-+mini_fo_flush(file_t *file)
-+#endif
-+{
-+	int err1 = 0;		/* assume ok (see open.c:close_fp) */
-+	int err2 = 0;
-+	file_t *hidden_file = NULL;
-+
-+	check_mini_fo_file(file);
-+
-+	/* mk: we don't do any state checking here, as its not worth the time.
-+	 * Just flush the lower level files if they exist.
-+	 */
-+	if(ftopd(file) != NULL) {
-+		if(ftohf(file) != NULL) {
-+			hidden_file = ftohf(file);
-+			if (hidden_file->f_op && hidden_file->f_op->flush)
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
-+				err1 = hidden_file->f_op->flush(hidden_file, id);
-+#else
-+				err1 = hidden_file->f_op->flush(hidden_file);
-+#endif
-+		}
-+		if(ftohf2(file) != NULL) {
-+			hidden_file = ftohf2(file);
-+			if (hidden_file->f_op && hidden_file->f_op->flush)
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
-+				err2 = hidden_file->f_op->flush(hidden_file, id);
-+#else
-+				err2 = hidden_file->f_op->flush(hidden_file);
-+#endif
-+		}
-+	}
-+	return (err1 | err2);
-+}
-+
-+
-+STATIC int
-+mini_fo_release(inode_t *inode, file_t *file)
-+{
-+	int err = 0;
-+	file_t *hidden_file = NULL;
-+
-+	if (ftopd(file) != NULL) {
-+		if(ftohf(file)) {
-+			hidden_file = ftohf(file);
-+			fput(hidden_file);
-+		}
-+		if(ftohf2(file)) {
-+			hidden_file = ftohf2(file);
-+			fput(hidden_file);
-+		}
-+		kfree(ftopd(file));
-+	}
-+	return err;
-+}
-+
-+STATIC int
-+mini_fo_fsync(file_t *file, dentry_t *dentry, int datasync)
-+{
-+	int err1 = 0;
-+	int err2 = 0;
-+	file_t *hidden_file = NULL;
-+	dentry_t *hidden_dentry;
-+
-+	check_mini_fo_file(file);
-+
-+	if ((hidden_file = ftohf(file)) != NULL) {
-+		hidden_dentry = dtohd(dentry);
-+		if (hidden_file->f_op && hidden_file->f_op->fsync) {
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+			mutex_lock(&hidden_dentry->d_inode->i_mutex);
-+#else
-+			down(&hidden_dentry->d_inode->i_sem);
-+#endif
-+			err1 = hidden_file->f_op->fsync(hidden_file, hidden_dentry, datasync);
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+			mutex_unlock(&hidden_dentry->d_inode->i_mutex);
-+#else
-+			up(&hidden_dentry->d_inode->i_sem);
-+#endif
-+		}
-+	}
-+
-+	if ((hidden_file = ftohf2(file)) != NULL) {
-+		hidden_dentry = dtohd2(dentry);
-+		if (hidden_file->f_op && hidden_file->f_op->fsync) {
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+			mutex_lock(&hidden_dentry->d_inode->i_mutex);
-+#else
-+			down(&hidden_dentry->d_inode->i_sem);
-+#endif
-+			err2 = hidden_file->f_op->fsync(hidden_file, hidden_dentry, datasync);
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+			mutex_unlock(&hidden_dentry->d_inode->i_mutex);
-+#else
-+			up(&hidden_dentry->d_inode->i_sem);
-+#endif
-+		}
-+	}
-+	else
-+		goto err;
-+
-+err:
-+	return (err1 || err2);
-+}
-+
-+
-+STATIC int
-+mini_fo_fasync(int fd, file_t *file, int flag)
-+{
-+	int err1 = 0;
-+	int err2 = 0;
-+
-+	file_t *hidden_file = NULL;
-+
-+	check_mini_fo_file(file);
-+
-+	if((hidden_file = ftohf(file)) != NULL) {
-+		err1 = hidden_file->f_op->fasync(fd, hidden_file, flag);
-+	}
-+	if((hidden_file = ftohf2(file)) != NULL) {
-+		err2 = hidden_file->f_op->fasync(fd, hidden_file, flag);
-+	}
-+
-+	return (err1 || err2);
-+}
-+
-+
-+
-+struct file_operations mini_fo_dir_fops =
-+	{
-+		read:	generic_read_dir,
-+		write:	mini_fo_write,
-+		readdir: mini_fo_readdir,
-+		poll:	mini_fo_poll,
-+		/* ioctl:	mini_fo_ioctl, */
-+		mmap:	mini_fo_mmap,
-+		open:	mini_fo_open,
-+		flush:	mini_fo_flush,
-+		release: mini_fo_release,
-+		fsync:	mini_fo_fsync,
-+		fasync:	mini_fo_fasync,
-+		/* not needed lock:	mini_fo_lock, */
-+		/* not needed: readv */
-+		/* not needed: writev */
-+		/* not implemented: sendpage */
-+		/* not implemented: get_unmapped_area */
-+	};
-+
-+struct file_operations mini_fo_main_fops =
-+	{
-+		llseek:	mini_fo_llseek,
-+		read:	mini_fo_read,
-+		write:	mini_fo_write,
-+		readdir: mini_fo_readdir,
-+		poll:	mini_fo_poll,
-+		/* ioctl:	mini_fo_ioctl, */
-+		mmap:	mini_fo_mmap,
-+		open:	mini_fo_open,
-+		flush:	mini_fo_flush,
-+		release: mini_fo_release,
-+		fsync:	mini_fo_fsync,
-+		fasync:	mini_fo_fasync,
-+		/* not needed: lock:	mini_fo_lock, */
-+		/* not needed: readv */
-+		/* not needed: writev */
-+		/* not implemented: sendpage */
-+		/* not implemented: get_unmapped_area */
-+	};
---- /dev/null
-+++ b/fs/mini_fo/fist.h
-@@ -0,0 +1,254 @@
-+/*
-+ * Copyright (c) 1997-2003 Erez Zadok
-+ * Copyright (c) 2001-2003 Stony Brook University
-+ *
-+ * For specific licensing information, see the COPYING file distributed with
-+ * this package, or get one from ftp://ftp.filesystems.org/pub/fist/COPYING.
-+ *
-+ * This Copyright notice must be kept intact and distributed with all
-+ * fistgen sources INCLUDING sources generated by fistgen.
-+ */
-+/*
-+ * Copyright (C) 2004, 2005 Markus Klotzbuecher <mk@creamnet.de>
-+ *
-+ * This program is free software; you can redistribute it and/or
-+ * modify it under the terms of the GNU General Public License
-+ * as published by the Free Software Foundation; either version
-+ * 2 of the License, or (at your option) any later version.
-+ */
-+
-+
-+/*
-+ *  $Id$
-+ */
-+
-+#ifndef __FIST_H_
-+#define __FIST_H_
-+
-+/*
-+ * KERNEL ONLY CODE:
-+ */
-+#ifdef __KERNEL__
-+#include <linux/version.h>
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33)
-+#include <generated/autoconf.h>
-+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,19)
-+#include <linux/autoconf.h>
-+#else
-+#include <linux/config.h>
-+#endif
-+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
-+#ifdef CONFIG_MODVERSIONS
-+# define MODVERSIONS
-+# include <linux/modversions.h>
-+#endif /* CONFIG_MODVERSIONS */
-+#endif /* KERNEL_VERSION < 2.6.0 */
-+#include <linux/sched.h>
-+#include <linux/kernel.h>
-+#include <linux/mm.h>
-+#include <linux/string.h>
-+#include <linux/stat.h>
-+#include <linux/errno.h>
-+#include <linux/wait.h>
-+#include <linux/limits.h>
-+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
-+#include <linux/locks.h>
-+#else
-+#include <linux/buffer_head.h>
-+#include <linux/pagemap.h>
-+#include <linux/namei.h>
-+#include <linux/module.h>
-+#include <linux/mount.h>
-+#include <linux/page-flags.h>
-+#include <linux/writeback.h>
-+#include <linux/statfs.h>
-+#endif
-+#include <linux/smp.h>
-+#include <linux/smp_lock.h>
-+#include <linux/file.h>
-+#include <linux/slab.h>
-+#include <linux/vmalloc.h>
-+#include <linux/poll.h>
-+#include <linux/list.h>
-+#include <linux/init.h>
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,20)
-+#include <linux/xattr.h>
-+#endif
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+#include <linux/security.h>
-+#endif
-+
-+#include <linux/swap.h>
-+
-+#include <asm/system.h>
-+/* #include <asm/segment.h> */
-+#include <asm/mman.h>
-+#include <linux/seq_file.h>
-+
-+/*
-+ * MACROS:
-+ */
-+
-+/* those mapped to ATTR_* were copied from linux/fs.h */
-+#define FA_MODE		ATTR_MODE
-+#define FA_UID		ATTR_UID
-+#define FA_GID		ATTR_GID
-+#define FA_SIZE		ATTR_SIZE
-+#define FA_ATIME	ATTR_ATIME
-+#define FA_MTIME	ATTR_MTIME
-+#define FA_CTIME	ATTR_CTIME
-+#define FA_ATIME_SET	ATTR_ATIME_SET
-+#define FA_MTIME_SET	ATTR_MTIME_SET
-+#define FA_FORCE	ATTR_FORCE
-+#define FA_ATTR_FLAGS	ATTR_ATTR_FLAG
-+
-+/* must be greater than all other ATTR_* flags! */
-+#define FA_NLINK	2048
-+#define FA_BLKSIZE	4096
-+#define FA_BLOCKS	8192
-+#define FA_TIMES	(FA_ATIME|FA_MTIME|FA_CTIME)
-+#define FA_ALL		0
-+
-+/* macros to manage changes between kernels */
-+#define INODE_DATA(i)	(&(i)->i_data)
-+
-+#define MIN(x,y) ((x < y) ? (x) : (y))
-+#define MAX(x,y) ((x > y) ? (x) : (y))
-+#define MAXPATHLEN PATH_MAX
-+
-+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,5)
-+# define lookup_one_len(a,b,c) lookup_one(a,b)
-+#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(2,4,5) */
-+
-+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,8)
-+# define generic_file_llseek default_llseek
-+#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(2,4,8) */
-+
-+#ifndef SEEK_SET
-+# define SEEK_SET 0
-+#endif /* not SEEK_SET */
-+
-+#ifndef SEEK_CUR
-+# define SEEK_CUR 1
-+#endif /* not SEEK_CUR */
-+
-+#ifndef SEEK_END
-+# define SEEK_END 2
-+#endif /* not SEEK_END */
-+
-+#ifndef DEFAULT_POLLMASK
-+# define DEFAULT_POLLMASK (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)
-+#endif /* not DEFAULT_POLLMASK */
-+
-+/* XXX: fix this so fistgen generates kfree() code directly */
-+#define kfree_s(a,b) kfree(a)
-+
-+/*
-+ * TYPEDEFS:
-+ */
-+typedef struct dentry dentry_t;
-+typedef struct file file_t;
-+typedef struct inode inode_t;
-+typedef inode_t vnode_t;
-+typedef struct page page_t;
-+typedef struct qstr qstr_t;
-+typedef struct super_block super_block_t;
-+typedef super_block_t vfs_t;
-+typedef struct vm_area_struct vm_area_t;
-+
-+
-+/*
-+ * EXTERNALS:
-+ */
-+
-+#define FPPF(str,page) printk("PPF %s 0x%x/%d: Lck:%d Err:%d Ref:%d Upd:%d Other::%d:%d:%d:%d:\n", \
-+		str, \
-+		(int) page, \
-+		(int) page->index, \
-+		(PageLocked(page) ? 1 : 0), \
-+		(PageError(page) ? 1 : 0), \
-+		(PageReferenced(page) ? 1 : 0), \
-+		(Page_Uptodate(page) ? 1 : 0), \
-+		(PageDecrAfter(page) ? 1 : 0), \
-+		(PageSlab(page) ? 1 : 0), \
-+		(PageSwapCache(page) ? 1 : 0), \
-+		(PageReserved(page) ? 1 : 0) \
-+		)
-+#define EZKDBG printk("EZK %s:%d:%s\n",__FILE__,__LINE__,__FUNCTION__)
-+#if 0
-+# define EZKDBG1 printk("EZK %s:%d\n",__FILE__,__LINE__)
-+#else
-+# define EZKDBG1
-+#endif
-+
-+extern int fist_get_debug_value(void);
-+extern int fist_set_debug_value(int val);
-+#if 0 /* mini_fo doesn't need these */
-+extern void fist_dprint_internal(int level, char *str,...);
-+extern void fist_print_dentry(char *str, const dentry_t *dentry);
-+extern void fist_print_inode(char *str, const inode_t *inode);
-+extern void fist_print_file(char *str, const file_t *file);
-+extern void fist_print_buffer_flags(char *str, struct buffer_head *buffer);
-+extern void fist_print_page_flags(char *str, page_t *page);
-+extern void fist_print_page_bytes(char *str, page_t *page);
-+extern void fist_print_pte_flags(char *str, const page_t *page);
-+extern void fist_checkinode(inode_t *inode, char *msg);
-+extern void fist_print_sb(char *str, const super_block_t *sb);
-+
-+/* §$% by mk: special debug functions */
-+extern void fist_mk_print_dentry(char *str, const dentry_t *dentry);
-+extern void fist_mk_print_inode(char *str, const inode_t *inode);
-+
-+extern char *add_indent(void);
-+extern char *del_indent(void);
-+#endif/* mini_fo doesn't need these */
-+
-+
-+#define STATIC
-+#define ASSERT(EX)	\
-+do {	\
-+    if (!(EX)) {	\
-+	printk(KERN_CRIT "ASSERTION FAILED: %s at %s:%d (%s)\n", #EX,	\
-+	       __FILE__, __LINE__, __FUNCTION__);	\
-+	(*((char *)0))=0;	\
-+    }	\
-+} while (0)
-+/* same ASSERT, but tell me who was the caller of the function */
-+#define ASSERT2(EX)	\
-+do {	\
-+    if (!(EX)) {	\
-+	printk(KERN_CRIT "ASSERTION FAILED (caller): %s at %s:%d (%s)\n", #EX,	\
-+	       file, line, func);	\
-+	(*((char *)0))=0;	\
-+    }	\
-+} while (0)
-+
-+#if 0 /* mini_fo doesn't need these */
-+#define dprintk(format, args...) printk(KERN_DEBUG format, ##args)
-+#define fist_dprint(level, str, args...) fist_dprint_internal(level, KERN_DEBUG str, ## args)
-+#define print_entry_location() fist_dprint(4, "%sIN:  %s %s:%d\n", add_indent(), __FUNCTION__, __FILE__, __LINE__)
-+#define print_exit_location() fist_dprint(4, "%s OUT: %s %s:%d\n", del_indent(), __FUNCTION__, __FILE__, __LINE__)
-+#define print_exit_status(status) fist_dprint(4, "%s OUT: %s %s:%d, STATUS: %d\n", del_indent(), __FUNCTION__, __FILE__, __LINE__, status)
-+#define print_exit_pointer(status) \
-+do { \
-+  if (IS_ERR(status)) \
-+    fist_dprint(4, "%s OUT: %s %s:%d, RESULT: %ld\n", del_indent(), __FUNCTION__, __FILE__, __LINE__, PTR_ERR(status)); \
-+  else \
-+    fist_dprint(4, "%s OUT: %s %s:%d, RESULT: 0x%x\n", del_indent(), __FUNCTION__, __FILE__, __LINE__, PTR_ERR(status)); \
-+} while (0)
-+#endif/* mini_fo doesn't need these */
-+
-+#endif /* __KERNEL__ */
-+
-+
-+/*
-+ * DEFINITIONS FOR USER AND KERNEL CODE:
-+ * (Note: ioctl numbers 1--9 are reserved for fistgen, the rest
-+ *  are auto-generated automatically based on the user's .fist file.)
-+ */
-+# define FIST_IOCTL_GET_DEBUG_VALUE	_IOR(0x15, 1, int)
-+# define FIST_IOCTL_SET_DEBUG_VALUE	_IOW(0x15, 2, int)
-+
-+#endif /* not __FIST_H_ */
---- /dev/null
-+++ b/fs/mini_fo/inode.c
-@@ -0,0 +1,1564 @@
-+/*
-+ * Copyright (c) 1997-2003 Erez Zadok
-+ * Copyright (c) 2001-2003 Stony Brook University
-+ *
-+ * For specific licensing information, see the COPYING file distributed with
-+ * this package, or get one from ftp://ftp.filesystems.org/pub/fist/COPYING.
-+ *
-+ * This Copyright notice must be kept intact and distributed with all
-+ * fistgen sources INCLUDING sources generated by fistgen.
-+ */
-+/*
-+ * Copyright (C) 2004, 2005 Markus Klotzbuecher <mk@creamnet.de>
-+ *
-+ * This program is free software; you can redistribute it and/or
-+ * modify it under the terms of the GNU General Public License
-+ * as published by the Free Software Foundation; either version
-+ * 2 of the License, or (at your option) any later version.
-+ */
-+
-+/*
-+ *  $Id$
-+ */
-+
-+#ifdef HAVE_CONFIG_H
-+# include <config.h>
-+#endif
-+
-+#include "fist.h"
-+#include "mini_fo.h"
-+
-+STATIC int
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+mini_fo_create(inode_t *dir, dentry_t *dentry, int mode, struct nameidata *nd)
-+#else
-+mini_fo_create(inode_t *dir, dentry_t *dentry, int mode)
-+#endif
-+{
-+	int err = 0;
-+
-+	check_mini_fo_dentry(dentry);
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+	err = create_sto_reg_file(dentry, mode, nd);
-+#else
-+	err = create_sto_reg_file(dentry, mode);
-+#endif
-+	check_mini_fo_dentry(dentry);
-+	return err;
-+}
-+
-+
-+STATIC dentry_t *
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+mini_fo_lookup(inode_t *dir, dentry_t *dentry, struct nameidata* nd)
-+#else
-+mini_fo_lookup(inode_t *dir, dentry_t *dentry)
-+#endif
-+{
-+	int err = 0;
-+	dentry_t *hidden_dir_dentry;
-+	dentry_t *hidden_dentry = NULL;
-+
-+	dentry_t *hidden_sto_dir_dentry;
-+	dentry_t *hidden_sto_dentry = NULL;
-+
-+	/* whiteout flag */
-+	int del_flag = 0;
-+	char *bpath = NULL;
-+
-+	const char *name;
-+	unsigned int namelen;
-+
-+	/* Don't allow lookups of META-files */
-+	namelen = strlen(META_FILENAME);
-+	if(namelen == dentry->d_name.len) {
-+		if(!strncmp(dentry->d_name.name, META_FILENAME, namelen)) {
-+			err = -ENOENT;
-+			goto out;
-+		}
-+	}
-+
-+	hidden_dir_dentry = dtohd(dentry->d_parent);
-+	hidden_sto_dir_dentry = dtohd2(dentry->d_parent);
-+
-+	name = dentry->d_name.name;
-+	namelen = dentry->d_name.len;
-+
-+	/* must initialize dentry operations */
-+	dentry->d_op = &mini_fo_dops;
-+
-+	/* setup the del_flag */
-+	del_flag = __meta_check_d_entry(dir, name, namelen);
-+	bpath = __meta_check_r_entry(dir, name, namelen);
-+
-+	/* perform the lookups of base and storage files:
-+	 *
-+	 * This caused some serious trouble, as a lookup_one_len passing
-+	 * a negative dentry oopses. Solution is to only do the lookup
-+	 * if the dentry is positive, else we set it to NULL
-+	 * More trouble, who said a *_dir_dentry can't be NULL?
-+	 */
-+	if(bpath) {
-+		/* Cross-Interposing (C), yeah! */
-+		hidden_dentry = bpath_walk(dir->i_sb, bpath);
-+		if(!hidden_dentry || !hidden_dentry->d_inode) {
-+			printk(KERN_CRIT "mini_fo_lookup: bpath_walk failed.\n");
-+			err= -EINVAL;
-+			goto out;
-+		}
-+
-+		/* this can be set up safely without fear of spaghetti
-+		 * interposing as it is only used for copying times */
-+		hidden_dir_dentry = hidden_dentry->d_parent;
-+		kfree(bpath);
-+	}
-+	else if(hidden_dir_dentry && hidden_dir_dentry->d_inode)
-+		hidden_dentry =
-+			lookup_one_len(name, hidden_dir_dentry, namelen);
-+	else
-+		hidden_dentry = NULL;
-+
-+	if(hidden_sto_dir_dentry && hidden_sto_dir_dentry->d_inode)
-+		hidden_sto_dentry =
-+			lookup_one_len(name, hidden_sto_dir_dentry, namelen);
-+	else
-+		hidden_sto_dentry =  NULL;
-+
-+	/* catch error in lookup */
-+	if (IS_ERR(hidden_dentry) || IS_ERR(hidden_sto_dentry)) {
-+		/* mk: we need to call dput on the dentry, whose
-+		 * lookup_one_len operation failed, in order to avoid
-+		 * unmount trouble.
-+		 */
-+		if(IS_ERR(hidden_dentry)) {
-+			printk(KERN_CRIT "mini_fo_lookup: ERR from base dentry, lookup failed.\n");
-+			err = PTR_ERR(hidden_dentry);
-+		} else {
-+			dput(hidden_dentry);
-+		}
-+		if(IS_ERR(hidden_sto_dentry)) {
-+			printk(KERN_CRIT "mini_fo_lookup: ERR from storage dentry, lookup failed.\n");
-+			err = PTR_ERR(hidden_sto_dentry);
-+		} else {
-+			dput(hidden_sto_dentry);
-+		}
-+		goto out;
-+	}
-+
-+	/* allocate dentry private data */
-+	__dtopd(dentry) = (struct mini_fo_dentry_info *)
-+		kmalloc(sizeof(struct mini_fo_dentry_info), GFP_KERNEL);
-+
-+	if (!dtopd(dentry)) {
-+		err = -ENOMEM;
-+		goto out_dput;
-+	}
-+
-+	/* check for different states of the mini_fo file to be looked up. */
-+
-+	/* state 1, file has been modified */
-+	if(hidden_dentry && hidden_sto_dentry &&
-+	   hidden_dentry->d_inode && hidden_sto_dentry->d_inode && !del_flag) {
-+
-+		/* update parent directory's atime */
-+		fist_copy_attr_atime(dir, hidden_sto_dir_dentry->d_inode);
-+
-+		dtopd(dentry)->state = MODIFIED;
-+		dtohd(dentry) = hidden_dentry;
-+		dtohd2(dentry) = hidden_sto_dentry;
-+
-+		err = mini_fo_tri_interpose(hidden_dentry,
-+					    hidden_sto_dentry,
-+					    dentry, dir->i_sb, 1);
-+		if (err) {
-+			printk(KERN_CRIT "mini_fo_lookup: error interposing (state1).\n");
-+			goto out_free;
-+		}
-+		goto out;
-+	}
-+	/* state 2, file is unmodified */
-+	if(hidden_dentry && hidden_dentry->d_inode && !del_flag) {
-+
-+		fist_copy_attr_atime(dir, hidden_dir_dentry->d_inode);
-+
-+		dtopd(dentry)->state = UNMODIFIED;
-+		dtohd(dentry) = hidden_dentry;
-+		dtohd2(dentry) = hidden_sto_dentry; /* could be negative */
-+
-+		err = mini_fo_tri_interpose(hidden_dentry,
-+					    hidden_sto_dentry,
-+					    dentry, dir->i_sb, 1);
-+		if (err) {
-+			printk(KERN_CRIT "mini_fo_lookup: error interposing (state2).\n");
-+			goto out_free;
-+		}
-+		goto out;
-+	}
-+	/* state 3, file has been newly created */
-+	if(hidden_sto_dentry && hidden_sto_dentry->d_inode && !del_flag) {
-+
-+		fist_copy_attr_atime(dir, hidden_sto_dir_dentry->d_inode);
-+		dtopd(dentry)->state = CREATED;
-+		dtohd(dentry) = hidden_dentry; /* could be negative */
-+		dtohd2(dentry) = hidden_sto_dentry;
-+
-+		err = mini_fo_tri_interpose(hidden_dentry,
-+					    hidden_sto_dentry,
-+					    dentry, dir->i_sb, 1);
-+		if (err) {
-+			printk(KERN_CRIT "mini_fo_lookup: error interposing (state3).\n");
-+			goto out_free;
-+		}
-+		goto out;
-+	}
-+
-+	/* state 4, file has deleted and created again. */
-+	if(hidden_dentry && hidden_sto_dentry &&
-+	   hidden_dentry->d_inode &&
-+	   hidden_sto_dentry->d_inode && del_flag) {
-+
-+		fist_copy_attr_atime(dir, hidden_sto_dir_dentry->d_inode);
-+		dtopd(dentry)->state = DEL_REWRITTEN;
-+		dtohd(dentry) = NULL;
-+		dtohd2(dentry) = hidden_sto_dentry;
-+
-+		err = mini_fo_tri_interpose(NULL,
-+					    hidden_sto_dentry,
-+					    dentry, dir->i_sb, 1);
-+		if (err) {
-+			printk(KERN_CRIT "mini_fo_lookup: error interposing (state4).\n");
-+			goto out_free;
-+		}
-+		/* We will never need this dentry again, as the file has been
-+		 * deleted from base */
-+		dput(hidden_dentry);
-+		goto out;
-+	}
-+	/* state 5, file has been deleted in base */
-+	if(hidden_dentry && hidden_sto_dentry &&
-+	   hidden_dentry->d_inode &&
-+	   !hidden_sto_dentry->d_inode && del_flag) {
-+
-+		/* check which parents atime we need for updating */
-+		if(hidden_sto_dir_dentry->d_inode)
-+			fist_copy_attr_atime(dir,
-+					     hidden_sto_dir_dentry->d_inode);
-+		else
-+			fist_copy_attr_atime(dir,
-+					     hidden_dir_dentry->d_inode);
-+
-+		dtopd(dentry)->state = DELETED;
-+		dtohd(dentry) = NULL;
-+		dtohd2(dentry) = hidden_sto_dentry;
-+
-+		/* add negative dentry to dcache to speed up lookups */
-+		d_add(dentry, NULL);
-+		dput(hidden_dentry);
-+		goto out;
-+	}
-+	/* state 6, file does not exist */
-+	if(((hidden_dentry && !hidden_dentry->d_inode) ||
-+	    (hidden_sto_dentry && !hidden_sto_dentry->d_inode)) && !del_flag)
-+		{
-+			/* check which parents atime we need for updating */
-+			if(hidden_sto_dir_dentry && hidden_sto_dir_dentry->d_inode)
-+				fist_copy_attr_atime(dir, hidden_sto_dir_dentry->d_inode);
-+			else
-+				fist_copy_attr_atime(dir, hidden_dir_dentry->d_inode);
-+
-+			dtopd(dentry)->state = NON_EXISTANT;
-+			dtohd(dentry) = hidden_dentry;
-+			dtohd2(dentry) = hidden_sto_dentry;
-+			d_add(dentry, NULL);
-+			goto out;
-+		}
-+
-+	/* if we get to here, were in an invalid state. bad. */
-+	printk(KERN_CRIT "mini_fo_lookup: ERROR, meta data corruption detected.\n");
-+
-+	/* end state checking */
-+ out_free:
-+	d_drop(dentry);		/* so that our bad dentry will get destroyed */
-+	kfree(dtopd(dentry));
-+	__dtopd(dentry) = NULL;	/* be safe */
-+
-+ out_dput:
-+	if(hidden_dentry)
-+		dput(hidden_dentry);
-+	if(hidden_sto_dentry)
-+		dput(hidden_sto_dentry); /* drops usage count and marks for release */
-+
-+ out:
-+	/* initalize wol if file exists and is directory */
-+	if(dentry->d_inode) {
-+		if(S_ISDIR(dentry->d_inode->i_mode)) {
-+			itopd(dentry->d_inode)->deleted_list_size = -1;
-+			itopd(dentry->d_inode)->renamed_list_size = -1;
-+			meta_build_lists(dentry);
-+		}
-+	}
-+	return ERR_PTR(err);
-+}
-+
-+
-+STATIC int
-+mini_fo_link(dentry_t *old_dentry, inode_t *dir, dentry_t *new_dentry)
-+{
-+	int err;
-+	dentry_t *hidden_old_dentry;
-+	dentry_t *hidden_new_dentry;
-+	dentry_t *hidden_dir_dentry;
-+
-+
-+	check_mini_fo_dentry(old_dentry);
-+	check_mini_fo_dentry(new_dentry);
-+	check_mini_fo_inode(dir);
-+
-+	/* no links to directorys and existing targets target allowed */
-+	if(S_ISDIR(old_dentry->d_inode->i_mode) ||
-+	   is_mini_fo_existant(new_dentry)) {
-+		err = -EPERM;
-+		goto out;
-+	}
-+
-+	/* bring it directly from unmod to del_rew */
-+	if(dtost(old_dentry) == UNMODIFIED) {
-+		err = nondir_unmod_to_mod(old_dentry, 1);
-+		if(err) {
-+			err = -EINVAL;
-+			goto out;
-+		}
-+		err = meta_add_d_entry(old_dentry->d_parent,
-+				       old_dentry->d_name.name,
-+				       old_dentry->d_name.len);
-+		if(err) {
-+			err = -EINVAL;
-+			goto out;
-+		}
-+		dput(dtohd(old_dentry));
-+		dtohd(old_dentry) = NULL;
-+		dtost(old_dentry) = DEL_REWRITTEN;
-+	}
-+
-+	err = get_neg_sto_dentry(new_dentry);
-+	if(err) {
-+		err = -EINVAL;
-+		goto out;
-+	}
-+
-+	hidden_old_dentry = dtohd2(old_dentry);
-+	hidden_new_dentry = dtohd2(new_dentry);
-+
-+	dget(hidden_old_dentry);
-+	dget(hidden_new_dentry);
-+
-+	/* was: hidden_dir_dentry = lock_parent(hidden_new_dentry); */
-+	hidden_dir_dentry = dget(hidden_new_dentry->d_parent);
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+	mutex_lock(&hidden_dir_dentry->d_inode->i_mutex);
-+#else
-+	down(&hidden_dir_dentry->d_inode->i_sem);
-+#endif
-+
-+	err = vfs_link(hidden_old_dentry,
-+		       hidden_dir_dentry->d_inode,
-+		       hidden_new_dentry);
-+	if (err || !hidden_new_dentry->d_inode)
-+		goto out_lock;
-+
-+	dtost(new_dentry) = CREATED;
-+ 	err = mini_fo_tri_interpose(NULL, hidden_new_dentry, new_dentry, dir->i_sb, 0);
-+	if (err)
-+		goto out_lock;
-+
-+	fist_copy_attr_timesizes(dir, hidden_new_dentry->d_inode);
-+	/* propagate number of hard-links */
-+	old_dentry->d_inode->i_nlink = itohi2(old_dentry->d_inode)->i_nlink;
-+
-+ out_lock:
-+	/* was: unlock_dir(hidden_dir_dentry); */
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+	mutex_unlock(&hidden_dir_dentry->d_inode->i_mutex);
-+#else
-+	up(&hidden_dir_dentry->d_inode->i_sem);
-+#endif
-+	dput(hidden_dir_dentry);
-+
-+	dput(hidden_new_dentry);
-+	dput(hidden_old_dentry);
-+	if (!new_dentry->d_inode)
-+		d_drop(new_dentry);
-+
-+ out:
-+	return err;
-+}
-+
-+
-+STATIC int
-+mini_fo_unlink(inode_t *dir, dentry_t *dentry)
-+{
-+	int err = 0;
-+
-+	dget(dentry);
-+	if(dtopd(dentry)->state == MODIFIED) {
-+		err = nondir_mod_to_del(dentry);
-+		goto out;
-+	}
-+	else if(dtopd(dentry)->state == UNMODIFIED) {
-+		err = nondir_unmod_to_del(dentry);
-+		goto out;
-+	}
-+	else if(dtopd(dentry)->state == CREATED) {
-+		err = nondir_creat_to_del(dentry);
-+		goto out;
-+	}
-+	else if(dtopd(dentry)->state == DEL_REWRITTEN) {
-+		err = nondir_del_rew_to_del(dentry);
-+		goto out;
-+	}
-+
-+	printk(KERN_CRIT "mini_fo_unlink: ERROR, invalid state detected.\n");
-+
-+ out:
-+	fist_copy_attr_times(dir, itohi2(dentry->d_parent->d_inode));
-+
-+	if(!err) {
-+		/* is this causing my pain? d_delete(dentry); */
-+		d_drop(dentry);
-+	}
-+
-+	dput(dentry);
-+	return err;
-+}
-+
-+
-+STATIC int
-+mini_fo_symlink(inode_t *dir, dentry_t *dentry, const char *symname)
-+{
-+	int err=0;
-+	dentry_t *hidden_sto_dentry;
-+	dentry_t *hidden_sto_dir_dentry;
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+        umode_t mode;
-+#endif
-+
-+	/* Fail if the symlink file exists */
-+	if(!(dtost(dentry) == DELETED ||
-+	     dtost(dentry) == NON_EXISTANT)) {
-+		err = -EEXIST;
-+		goto out;
-+	}
-+
-+	err = get_neg_sto_dentry(dentry);
-+	if(err) {
-+		err = -EINVAL;
-+		goto out;
-+	}
-+	hidden_sto_dentry = dtohd2(dentry);
-+
-+	dget(hidden_sto_dentry);
-+	/* was: hidden_sto_dir_dentry = lock_parent(hidden_sto_dentry); */
-+	hidden_sto_dir_dentry = dget(hidden_sto_dentry->d_parent);
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+	mutex_lock(&hidden_sto_dir_dentry->d_inode->i_mutex);
-+#else
-+	down(&hidden_sto_dir_dentry->d_inode->i_sem);
-+#endif
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+	mode = S_IALLUGO;
-+	err = vfs_symlink(hidden_sto_dir_dentry->d_inode,
-+			  hidden_sto_dentry, symname, mode);
-+#else
-+	err = vfs_symlink(hidden_sto_dir_dentry->d_inode,
-+			  hidden_sto_dentry,
-+			  symname);
-+#endif
-+	if (err || !hidden_sto_dentry->d_inode)
-+                goto out_lock;
-+
-+        if(dtost(dentry) == DELETED) {
-+                dtost(dentry) = DEL_REWRITTEN;
-+                err = mini_fo_tri_interpose(NULL, hidden_sto_dentry, dentry, dir->i_sb, 0);
-+                if(err)
-+                        goto out_lock;
-+        } else if(dtost(dentry) == NON_EXISTANT) {
-+                dtost(dentry) = CREATED;
-+                err = mini_fo_tri_interpose(dtohd(dentry), hidden_sto_dentry, dentry, dir->i_sb, 0);
-+                if(err)
-+                        goto out_lock;
-+        }
-+	fist_copy_attr_timesizes(dir, hidden_sto_dir_dentry->d_inode);
-+
-+ out_lock:
-+        /* was: unlock_dir(hidden_sto_dir_dentry); */
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+	mutex_unlock(&hidden_sto_dir_dentry->d_inode->i_mutex);
-+#else
-+	up(&hidden_sto_dir_dentry->d_inode->i_sem);
-+#endif
-+	dput(hidden_sto_dir_dentry);
-+
-+        dput(hidden_sto_dentry);
-+        if (!dentry->d_inode)
-+                d_drop(dentry);
-+ out:
-+        return err;
-+}
-+
-+STATIC int
-+mini_fo_mkdir(inode_t *dir, dentry_t *dentry, int mode)
-+{
-+	int err;
-+
-+	err = create_sto_dir(dentry, mode);
-+
-+	check_mini_fo_dentry(dentry);
-+
-+	return err;
-+}
-+
-+
-+STATIC int
-+mini_fo_rmdir(inode_t *dir, dentry_t *dentry)
-+{
-+	int err = 0;
-+
-+	dentry_t *hidden_sto_dentry;
-+	dentry_t *hidden_sto_dir_dentry;
-+	dentry_t *meta_dentry;
-+	inode_t *hidden_sto_dir = NULL;
-+
-+	check_mini_fo_dentry(dentry);
-+	check_mini_fo_inode(dir);
-+
-+	dget(dentry);
-+	if(dtopd(dentry)->state == MODIFIED) {
-+		/* XXX: disabled, because it does not bother to check files on
-+		 * the original filesystem - just a hack, but better than simply
-+		 * removing it without testing */
-+		err = -EINVAL;
-+		goto out;
-+
-+		hidden_sto_dir = itohi2(dir);
-+		hidden_sto_dentry = dtohd2(dentry);
-+
-+		/* was:hidden_sto_dir_dentry = lock_parent(hidden_sto_dentry); */
-+		hidden_sto_dir_dentry = dget(hidden_sto_dentry->d_parent);
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+		mutex_lock(&hidden_sto_dir_dentry->d_inode->i_mutex);
-+#else
-+		down(&hidden_sto_dir_dentry->d_inode->i_sem);
-+#endif
-+
-+		/* Delete an old WOL file contained in the storage dir */
-+		meta_dentry = lookup_one_len(META_FILENAME,
-+					     hidden_sto_dentry,
-+					     strlen(META_FILENAME));
-+		if(meta_dentry->d_inode) {
-+			err = vfs_unlink(hidden_sto_dentry->d_inode, meta_dentry);
-+			dput(meta_dentry);
-+			if(!err)
-+				d_delete(meta_dentry);
-+		}
-+
-+		err = vfs_rmdir(hidden_sto_dir, hidden_sto_dentry);
-+		dput(hidden_sto_dentry);
-+		if(!err)
-+			d_delete(hidden_sto_dentry);
-+
-+		/* propagate number of hard-links */
-+		dentry->d_inode->i_nlink = itohi2(dentry->d_inode)->i_nlink;
-+
-+		dput(dtohd(dentry));
-+
-+		dtohd(dentry) = NULL;
-+		dtopd(dentry)->state = DELETED;
-+
-+		/* carefull with R files */
-+		if( __meta_is_r_entry(dir,
-+				      dentry->d_name.name,
-+				      dentry->d_name.len) == 1) {
-+			err = meta_remove_r_entry(dentry->d_parent,
-+						  dentry->d_name.name,
-+						  dentry->d_name.len);
-+			if(err) {
-+				printk(KERN_CRIT "mini_fo: rmdir: meta_remove_r_entry failed.\n");
-+				goto out;
-+			}
-+		}
-+		else {
-+			/* ok, add deleted file to META */
-+			meta_add_d_entry(dentry->d_parent,
-+					 dentry->d_name.name,
-+					 dentry->d_name.len);
-+		}
-+		/* was: unlock_dir(hidden_sto_dir_dentry); */
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+		mutex_unlock(&hidden_sto_dir_dentry->d_inode->i_mutex);
-+#else
-+		up(&hidden_sto_dir_dentry->d_inode->i_sem);
-+#endif
-+		dput(hidden_sto_dir_dentry);
-+		goto out;
-+	}
-+	else if(dtopd(dentry)->state == UNMODIFIED) {
-+		/* XXX: simply adding it to the delete list here is fscking dangerous!
-+		 * as a temporary hack, i will disable rmdir on unmodified directories
-+		 * for now.
-+		 */
-+		err = -EINVAL;
-+		goto out;
-+
-+		err = get_neg_sto_dentry(dentry);
-+		if(err) {
-+			err = -EINVAL;
-+			goto out;
-+		}
-+
-+		/* dput base dentry, this will relase the inode and free the
-+		 * dentry, as we will never need it again. */
-+		dput(dtohd(dentry));
-+		dtohd(dentry) = NULL;
-+		dtopd(dentry)->state = DELETED;
-+
-+		/* add deleted file to META-file */
-+		meta_add_d_entry(dentry->d_parent,
-+				 dentry->d_name.name,
-+				 dentry->d_name.len);
-+		goto out;
-+	}
-+	else if(dtopd(dentry)->state == CREATED) {
-+		hidden_sto_dir = itohi2(dir);
-+		hidden_sto_dentry = dtohd2(dentry);
-+
-+		/* was: hidden_sto_dir_dentry = lock_parent(hidden_sto_dentry);*/
-+		hidden_sto_dir_dentry = dget(hidden_sto_dentry->d_parent);
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+		mutex_lock(&hidden_sto_dir_dentry->d_inode->i_mutex);
-+#else
-+		down(&hidden_sto_dir_dentry->d_inode->i_sem);
-+#endif
-+
-+		/* Delete an old WOL file contained in the storage dir */
-+		meta_dentry = lookup_one_len(META_FILENAME,
-+					     hidden_sto_dentry,
-+					     strlen(META_FILENAME));
-+		if(meta_dentry->d_inode) {
-+			/* is this necessary? dget(meta_dentry); */
-+			err = vfs_unlink(hidden_sto_dentry->d_inode,
-+					 meta_dentry);
-+			dput(meta_dentry);
-+			if(!err)
-+				d_delete(meta_dentry);
-+		}
-+
-+		err = vfs_rmdir(hidden_sto_dir, hidden_sto_dentry);
-+		dput(hidden_sto_dentry);
-+		if(!err)
-+			d_delete(hidden_sto_dentry);
-+
-+		/* propagate number of hard-links */
-+		dentry->d_inode->i_nlink = itohi2(dentry->d_inode)->i_nlink;
-+		dtopd(dentry)->state = NON_EXISTANT;
-+
-+		/* was: unlock_dir(hidden_sto_dir_dentry); */
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+		mutex_unlock(&hidden_sto_dir_dentry->d_inode->i_mutex);
-+#else
-+		up(&hidden_sto_dir_dentry->d_inode->i_sem);
-+#endif
-+		dput(hidden_sto_dir_dentry);
-+
-+		goto out;
-+	}
-+	else if(dtopd(dentry)->state == DEL_REWRITTEN) {
-+		hidden_sto_dir = itohi2(dir);
-+		hidden_sto_dentry = dtohd2(dentry);
-+
-+		/* was: hidden_sto_dir_dentry = lock_parent(hidden_sto_dentry);*/
-+		hidden_sto_dir_dentry = dget(hidden_sto_dentry->d_parent);
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+		mutex_lock(&hidden_sto_dir_dentry->d_inode->i_mutex);
-+#else
-+		down(&hidden_sto_dir_dentry->d_inode->i_sem);
-+#endif
-+
-+		/* Delete an old WOL file contained in the storage dir */
-+		meta_dentry = lookup_one_len(META_FILENAME,
-+					     hidden_sto_dentry,
-+					     strlen(META_FILENAME));
-+		if(meta_dentry->d_inode) {
-+			/* is this necessary? dget(meta_dentry); */
-+			err = vfs_unlink(hidden_sto_dentry->d_inode,
-+					 meta_dentry);
-+			dput(meta_dentry);
-+			if(!err)
-+				d_delete(meta_dentry);
-+		}
-+
-+		err = vfs_rmdir(hidden_sto_dir, hidden_sto_dentry);
-+		dput(hidden_sto_dentry);
-+		if(!err)
-+			d_delete(hidden_sto_dentry);
-+
-+		/* propagate number of hard-links */
-+		dentry->d_inode->i_nlink = itohi2(dentry->d_inode)->i_nlink;
-+		dtopd(dentry)->state = DELETED;
-+		/* was: unlock_dir(hidden_sto_dir_dentry); */
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+		mutex_unlock(&hidden_sto_dir_dentry->d_inode->i_mutex);
-+#else
-+		up(&hidden_sto_dir_dentry->d_inode->i_sem);
-+#endif
-+		dput(hidden_sto_dir_dentry);
-+		goto out;
-+	}
-+
-+	printk(KERN_CRIT "mini_fo_rmdir: ERROR, invalid state detected.\n");
-+
-+ out:
-+	if(!err) {
-+		d_drop(dentry);
-+	}
-+
-+	fist_copy_attr_times(dir, itohi2(dentry->d_parent->d_inode));
-+	dput(dentry);
-+
-+	return err;
-+}
-+
-+
-+STATIC int
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+mini_fo_mknod(inode_t *dir, dentry_t *dentry, int mode, dev_t dev)
-+#else
-+mini_fo_mknod(inode_t *dir, dentry_t *dentry, int mode, int dev)
-+#endif
-+{
-+	int err = 0;
-+
-+	check_mini_fo_dentry(dentry);
-+
-+	err = create_sto_nod(dentry, mode, dev);
-+	if(err) {
-+		printk(KERN_CRIT "mini_fo_mknod: creating sto nod failed.\n");
-+		err = -EINVAL;
-+	}
-+
-+	check_mini_fo_dentry(dentry);
-+	return err;
-+}
-+
-+
-+STATIC int
-+mini_fo_rename(inode_t *old_dir, dentry_t *old_dentry,
-+	       inode_t *new_dir, dentry_t *new_dentry)
-+{
-+	/* dispatch */
-+	if(S_ISDIR(old_dentry->d_inode->i_mode))
-+		return rename_directory(old_dir, old_dentry, new_dir, new_dentry);
-+	return rename_nondir(old_dir, old_dentry, new_dir, new_dentry);
-+
-+}
-+
-+int rename_directory(inode_t *old_dir, dentry_t *old_dentry,
-+		     inode_t *new_dir, dentry_t *new_dentry)
-+{
-+	int err, bpath_len;
-+	char *bpath;
-+
-+	dentry_t *hidden_old_dentry;
-+	dentry_t *hidden_new_dentry;
-+	dentry_t *hidden_old_dir_dentry;
-+	dentry_t *hidden_new_dir_dentry;
-+
-+	err = 0;
-+	bpath = NULL;
-+	bpath_len = 0;
-+
-+	/* this is a test, chuck out if it works */
-+	if(!(dtopd(new_dentry)->state == DELETED ||
-+	     dtopd(new_dentry)->state == NON_EXISTANT)) {
-+		printk(KERN_CRIT "mini_fo: rename_directory: \
-+                                  uh, ah, new_dentry not negative.\n");
-+		/* return -1; */
-+	}
-+
-+	/* state = UNMODIFIED */
-+	if(dtopd(old_dentry)->state == UNMODIFIED) {
-+		err = dir_unmod_to_mod(old_dentry);
-+		if (err)
-+			goto out;
-+	}
-+
-+	/* state = MODIFIED */
-+	if(dtopd(old_dentry)->state == MODIFIED) {
-+		bpath = meta_check_r_entry(old_dentry->d_parent,
-+					   old_dentry->d_name.name,
-+					   old_dentry->d_name.len);
-+		if(bpath) {
-+			err = meta_remove_r_entry(old_dentry->d_parent,
-+						  old_dentry->d_name.name,
-+						  old_dentry->d_name.len);
-+			if(err) {
-+				printk(KERN_CRIT "mini_fo: rename_directory:\
-+                                                   meta_remove_r_entry \
-+                                                  failed.\n");
-+				goto out;
-+			}
-+			err = meta_add_r_entry(new_dentry->d_parent,
-+					       bpath,
-+					       strlen(bpath),
-+					       new_dentry->d_name.name,
-+					       new_dentry->d_name.len);
-+			kfree(bpath);
-+		}
-+		else {/* wol it */
-+			err = meta_add_d_entry(old_dentry->d_parent,
-+					       old_dentry->d_name.name,
-+					       old_dentry->d_name.len);
-+			if (err)
-+				goto out;
-+			/* put it on rename list */
-+			err = get_mini_fo_bpath(old_dentry,
-+						&bpath,
-+						&bpath_len);
-+			if (err)
-+				goto out;
-+			err = meta_add_r_entry(new_dentry->d_parent,
-+					       bpath, bpath_len,
-+					       new_dentry->d_name.name,
-+					       new_dentry->d_name.len);
-+			if (err)
-+				goto out;
-+		}
-+		/* no state change, MODIFIED stays MODIFIED */
-+	}
-+	/* state = CREATED */
-+	if(dtopd(old_dentry)->state == CREATED ||
-+	   dtopd(old_dentry)->state == DEL_REWRITTEN) {
-+		if(dtohd(old_dentry))
-+			dput(dtohd(old_dentry));
-+
-+		if(dtopd(new_dentry)->state == DELETED) {
-+			dtopd(old_dentry)->state = DEL_REWRITTEN;
-+			dtohd(old_dentry) = NULL;
-+		}
-+		else if(dtopd(new_dentry)->state == NON_EXISTANT) {
-+			dtopd(old_dentry)->state = CREATED;
-+			/* steal new dentry's neg. base dentry */
-+			dtohd(old_dentry) = dtohd(new_dentry);
-+			dtohd(new_dentry) = NULL;
-+		}
-+	}
-+	if(dtopd(new_dentry)->state == UNMODIFIED ||
-+	   dtopd(new_dentry)->state == NON_EXISTANT) {
-+		err = get_neg_sto_dentry(new_dentry);
-+		if(err)
-+			goto out;
-+	}
-+
-+	/* now move sto file */
-+	hidden_old_dentry = dtohd2(old_dentry);
-+	hidden_new_dentry = dtohd2(new_dentry);
-+
-+	dget(hidden_old_dentry);
-+	dget(hidden_new_dentry);
-+
-+	hidden_old_dir_dentry = dget(hidden_old_dentry->d_parent);
-+	hidden_new_dir_dentry = dget(hidden_new_dentry->d_parent);
-+	double_lock(hidden_old_dir_dentry, hidden_new_dir_dentry);
-+
-+	err = vfs_rename(hidden_old_dir_dentry->d_inode, hidden_old_dentry,
-+			 hidden_new_dir_dentry->d_inode, hidden_new_dentry);
-+	if(err)
-+		goto out_lock;
-+
-+	fist_copy_attr_all(new_dir, hidden_new_dir_dentry->d_inode);
-+	if (new_dir != old_dir)
-+		fist_copy_attr_all(old_dir,
-+				   hidden_old_dir_dentry->d_inode);
-+
-+ out_lock:
-+	/* double_unlock will dput the new/old parent dentries
-+	 * whose refcnts were incremented via get_parent above. */
-+	double_unlock(hidden_old_dir_dentry, hidden_new_dir_dentry);
-+	dput(hidden_new_dentry);
-+	dput(hidden_old_dentry);
-+
-+ out:
-+	return err;
-+}
-+
-+int rename_nondir(inode_t *old_dir, dentry_t *old_dentry,
-+		  inode_t *new_dir, dentry_t *new_dentry)
-+{
-+	int err=0;
-+
-+	check_mini_fo_dentry(old_dentry);
-+	check_mini_fo_dentry(new_dentry);
-+	check_mini_fo_inode(old_dir);
-+	check_mini_fo_inode(new_dir);
-+
-+	/* state: UNMODIFIED */
-+	if(dtost(old_dentry) == UNMODIFIED) {
-+		err = nondir_unmod_to_mod(old_dentry, 1);
-+		if(err) {
-+			err = -EINVAL;
-+			goto out;
-+		}
-+	}
-+
-+	/* the easy states */
-+	if(exists_in_storage(old_dentry)) {
-+
-+		dentry_t *hidden_old_dentry;
-+		dentry_t *hidden_new_dentry;
-+		dentry_t *hidden_old_dir_dentry;
-+		dentry_t *hidden_new_dir_dentry;
-+
-+		/* if old file is MODIFIED, add it to the deleted_list */
-+		if(dtopd(old_dentry)->state == MODIFIED) {
-+			meta_add_d_entry(old_dentry->d_parent,
-+					 old_dentry->d_name.name,
-+					 old_dentry->d_name.len);
-+
-+			dput(dtohd(old_dentry));
-+		}
-+		/* if old file is CREATED, we only release the base dentry */
-+		if(dtopd(old_dentry)->state == CREATED) {
-+			if(dtohd(old_dentry))
-+				dput(dtohd(old_dentry));
-+		}
-+
-+		/* now setup the new states (depends on new_dentry state) */
-+		/* new dentry state =  MODIFIED */
-+		if(dtopd(new_dentry)->state == MODIFIED) {
-+			meta_add_d_entry(new_dentry->d_parent,
-+					 new_dentry->d_name.name,
-+					 new_dentry->d_name.len);
-+
-+			/* new dentry will be d_put'ed later by the vfs
-+			 * so don't do it here
-+			 * dput(dtohd(new_dentry));
-+			 */
-+			dtohd(old_dentry) = NULL;
-+			dtopd(old_dentry)->state = DEL_REWRITTEN;
-+		}
-+		/* new dentry state =  UNMODIFIED */
-+		else if(dtopd(new_dentry)->state == UNMODIFIED) {
-+			if(get_neg_sto_dentry(new_dentry))
-+				return -EINVAL;
-+
-+			meta_add_d_entry(new_dentry->d_parent,
-+					 new_dentry->d_name.name,
-+					 new_dentry->d_name.len);
-+
-+			/* is this right??? */
-+			/*dput(dtohd(new_dentry));*/
-+			dtohd(old_dentry) = NULL;
-+			dtopd(old_dentry)->state = DEL_REWRITTEN;
-+		}
-+		/* new dentry state =  CREATED */
-+		else if(dtopd(new_dentry)->state == CREATED) {
-+			/* we keep the neg. base dentry (if exists) */
-+			dtohd(old_dentry) = dtohd(new_dentry);
-+			/* ...and set it to Null, or we'll get
-+			 * dcache.c:345 if it gets dput twice... */
-+			dtohd(new_dentry) = NULL;
-+			dtopd(old_dentry)->state = CREATED;
-+		}
-+		/* new dentry state =  NON_EXISTANT */
-+		else if(dtopd(new_dentry)->state == NON_EXISTANT) {
-+			if(get_neg_sto_dentry(new_dentry))
-+				return -EINVAL;
-+
-+			/* we keep the neg. base dentry (if exists) */
-+			dtohd(old_dentry) = dtohd(new_dentry);
-+			/* ...and set it to Null, or we'll get
-+			 * Dr. dcache.c:345 if it gets dput twice... */
-+			dtohd(new_dentry) = NULL;
-+			dtopd(old_dentry)->state = CREATED;
-+		}
-+		/* new dentry state =  DEL_REWRITTEN or DELETED */
-+		else if(dtopd(new_dentry)->state == DEL_REWRITTEN ||
-+			dtopd(new_dentry)->state == DELETED) {
-+			dtohd(old_dentry) = NULL;
-+			dtopd(old_dentry)->state = DEL_REWRITTEN;
-+		}
-+		else { /* not possible, uhh, ahh */
-+			printk(KERN_CRIT
-+			       "mini_fo: rename_reg_file: invalid state detected [1].\n");
-+			return -1;
-+		}
-+
-+		/* now we definitely have a sto file */
-+		hidden_old_dentry = dtohd2(old_dentry);
-+		hidden_new_dentry = dtohd2(new_dentry);
-+
-+		dget(hidden_old_dentry);
-+		dget(hidden_new_dentry);
-+
-+		hidden_old_dir_dentry = dget(hidden_old_dentry->d_parent);
-+		hidden_new_dir_dentry = dget(hidden_new_dentry->d_parent);
-+		double_lock(hidden_old_dir_dentry, hidden_new_dir_dentry);
-+
-+		err = vfs_rename(hidden_old_dir_dentry->d_inode,
-+				 hidden_old_dentry,
-+				 hidden_new_dir_dentry->d_inode,
-+				 hidden_new_dentry);
-+		if(err)
-+			goto out_lock;
-+
-+		fist_copy_attr_all(new_dir, hidden_new_dir_dentry->d_inode);
-+		if (new_dir != old_dir)
-+			fist_copy_attr_all(old_dir, hidden_old_dir_dentry->d_inode);
-+
-+	out_lock:
-+		/* double_unlock will dput the new/old parent dentries
-+		 * whose refcnts were incremented via get_parent above.
-+		 */
-+		double_unlock(hidden_old_dir_dentry, hidden_new_dir_dentry);
-+		dput(hidden_new_dentry);
-+		dput(hidden_old_dentry);
-+	out:
-+		return err;
-+	}
-+	else { /* invalid state */
-+		printk(KERN_CRIT "mini_fo: rename_reg_file: ERROR: invalid state detected [2].\n");
-+		return -1;
-+	}
-+}
-+
-+
-+STATIC int
-+mini_fo_readlink(dentry_t *dentry, char *buf, int bufsiz)
-+{
-+	int err=0;
-+	dentry_t *hidden_dentry = NULL;
-+
-+	if(dtohd2(dentry) && dtohd2(dentry)->d_inode) {
-+		hidden_dentry = dtohd2(dentry);
-+	} else if(dtohd(dentry) && dtohd(dentry)->d_inode) {
-+		hidden_dentry = dtohd(dentry);
-+	} else {
-+		goto out;
-+	}
-+
-+	if (!hidden_dentry->d_inode->i_op ||
-+	    !hidden_dentry->d_inode->i_op->readlink) {
-+		err = -EINVAL;		goto out;
-+	}
-+
-+	err = hidden_dentry->d_inode->i_op->readlink(hidden_dentry,
-+						     buf,
-+						     bufsiz);
-+	if (err > 0)
-+		fist_copy_attr_atime(dentry->d_inode, hidden_dentry->d_inode);
-+
-+ out:
-+	return err;
-+}
-+
-+
-+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,13)
-+static int mini_fo_follow_link(dentry_t *dentry, struct nameidata *nd)
-+#else
-+static void* mini_fo_follow_link(dentry_t *dentry, struct nameidata *nd)
-+#endif
-+{
-+	char *buf;
-+	int len = PAGE_SIZE, err;
-+	mm_segment_t old_fs;
-+
-+	/* in 2.6 this is freed by mini_fo_put_link called by __do_follow_link */
-+	buf = kmalloc(len, GFP_KERNEL);
-+	if (!buf) {
-+		err = -ENOMEM;
-+		goto out;
-+	}
-+
-+	/* read the symlink, and then we will follow it */
-+	old_fs = get_fs();
-+	set_fs(KERNEL_DS);
-+	err = dentry->d_inode->i_op->readlink(dentry, buf, len);
-+	set_fs(old_fs);
-+	if (err < 0) {
-+		kfree(buf);
-+		buf = NULL;
-+		goto out;
-+	}
-+	buf[err] = 0;
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+        nd_set_link(nd, buf);
-+        err = 0;
-+#else
-+	err = vfs_follow_link(nd, buf);
-+#endif
-+
-+ out:
-+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
-+	kfree(buf);
-+#endif
-+
-+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,13)
-+        return err;
-+#else
-+        return ERR_PTR(err);
-+#endif
-+}
-+
-+STATIC
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,13)
-+void mini_fo_put_link(struct dentry *dentry, struct nameidata *nd)
-+#else
-+void mini_fo_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
-+#endif
-+{
-+        char *link;
-+        link = nd_get_link(nd);
-+        kfree(link);
-+}
-+#endif
-+
-+STATIC int
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+mini_fo_permission(inode_t *inode, int mask, struct nameidata *nd)
-+#else
-+mini_fo_permission(inode_t *inode, int mask)
-+#endif
-+{
-+	inode_t *hidden_inode;
-+	int mode;
-+	int err;
-+
-+	if(itohi2(inode)) {
-+		hidden_inode = itohi2(inode);
-+	} else {
-+		hidden_inode = itohi(inode);
-+	}
-+	mode = inode->i_mode;
-+
-+	/* not really needed, as permission handles everything:
-+	 *	err = vfs_permission(inode, mask);
-+	 *	if (err)
-+	 *		goto out;
-+	 */
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+	err = permission(hidden_inode, mask, nd);
-+#else
-+	err = permission(hidden_inode, mask);
-+#endif
-+
-+	/*  out: */
-+	return err;
-+}
-+
-+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
-+STATIC int
-+mini_fo_inode_revalidate(dentry_t *dentry)
-+{
-+	int err = 0;
-+	dentry_t *hidden_dentry;
-+	inode_t *hidden_inode;
-+
-+	ASSERT(dentry->d_inode);
-+	ASSERT(itopd(dentry->d_inode));
-+
-+	if(itohi2(dentry->d_inode)) {
-+                hidden_dentry = dtohd2(dentry);
-+		hidden_inode = hidden_dentry->d_inode;
-+	} else if(itohi(dentry->d_inode)) {
-+                hidden_dentry = dtohd(dentry);
-+		hidden_inode = hidden_dentry->d_inode;
-+	} else {
-+                printk(KERN_CRIT "mini_fo_inode_revalidate: ERROR, invalid state detected.\n");
-+                err = -ENOENT;
-+                goto out;
-+        }
-+	if (hidden_inode && hidden_inode->i_op && hidden_inode->i_op->revalidate){
-+		err = hidden_inode->i_op->revalidate(hidden_dentry);
-+		if (err)
-+			goto out;
-+	}
-+	fist_copy_attr_all(dentry->d_inode, hidden_inode);
-+ out:
-+	return err;
-+}
-+#endif
-+
-+STATIC int
-+mini_fo_setattr(dentry_t *dentry, struct iattr *ia)
-+{
-+	int err = 0;
-+
-+	check_mini_fo_dentry(dentry);
-+
-+	if(!is_mini_fo_existant(dentry)) {
-+		printk(KERN_CRIT "mini_fo_setattr: ERROR, invalid state detected [1].\n");
-+		goto out;
-+	}
-+
-+	if(dtost(dentry) == UNMODIFIED) {
-+		if(!IS_COPY_FLAG(ia->ia_valid))
-+			goto out; /* we ignore these changes to base */
-+
-+		if(S_ISDIR(dentry->d_inode->i_mode)) {
-+			err = dir_unmod_to_mod(dentry);
-+		} else {
-+			/* we copy contents if file is not beeing truncated */
-+			if(S_ISREG(dentry->d_inode->i_mode) &&
-+			   !(ia->ia_size == 0 && (ia->ia_valid & ATTR_SIZE))) {
-+				err = nondir_unmod_to_mod(dentry, 1);
-+			} else
-+				err = nondir_unmod_to_mod(dentry, 0);
-+		}
-+		if(err) {
-+			err = -EINVAL;
-+			printk(KERN_CRIT "mini_fo_setattr: ERROR changing states.\n");
-+			goto out;
-+		}
-+	}
-+	if(!exists_in_storage(dentry)) {
-+		printk(KERN_CRIT "mini_fo_setattr: ERROR, invalid state detected [2].\n");
-+		err = -EINVAL;
-+		goto out;
-+	}
-+	ASSERT(dentry->d_inode);
-+	ASSERT(dtohd2(dentry));
-+	ASSERT(itopd(dentry->d_inode));
-+	ASSERT(itohi2(dentry->d_inode));
-+
-+	err = notify_change(dtohd2(dentry), ia);
-+	fist_copy_attr_all(dentry->d_inode, itohi2(dentry->d_inode));
-+ out:
-+	return err;
-+}
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+STATIC int
-+mini_fo_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
-+{
-+	int err = 0;
-+        dentry_t *hidden_dentry;
-+
-+	ASSERT(dentry->d_inode);
-+	ASSERT(itopd(dentry->d_inode));
-+
-+	if(itohi2(dentry->d_inode)) {
-+                hidden_dentry = dtohd2(dentry);
-+	} else if(itohi(dentry->d_inode)) {
-+                hidden_dentry = dtohd(dentry);
-+	} else {
-+                printk(KERN_CRIT "mini_fo_getattr: ERROR, invalid state detected.\n");
-+                err = -ENOENT;
-+                goto out;
-+        }
-+	fist_copy_attr_all(dentry->d_inode, hidden_dentry->d_inode);
-+
-+	ASSERT(hidden_dentry);
-+	ASSERT(hidden_dentry->d_inode);
-+	ASSERT(hidden_dentry->d_inode->i_op);
-+
-+	generic_fillattr(dentry->d_inode, stat);
-+	if (!stat->blksize) {
-+		struct super_block *s = hidden_dentry->d_inode->i_sb;
-+		unsigned blocks;
-+		blocks = (stat->size+s->s_blocksize-1) >> s->s_blocksize_bits;
-+		stat->blocks = (s->s_blocksize / 512) * blocks;
-+		stat->blksize = s->s_blocksize;
-+	}
-+ out:
-+        return err;
-+}
-+#endif
-+
-+#if defined(XATTR) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,20))
-+#if 0 /* no xattr_alloc() and xattr_free() */
-+/* This is lifted from fs/xattr.c */
-+static void *
-+xattr_alloc(size_t size, size_t limit)
-+{
-+	void *ptr;
-+
-+	if (size > limit)
-+		return ERR_PTR(-E2BIG);
-+
-+	if (!size)	/* size request, no buffer is needed */
-+		return NULL;
-+	else if (size <= PAGE_SIZE)
-+		ptr = kmalloc((unsigned long) size, GFP_KERNEL);
-+	else
-+		ptr = vmalloc((unsigned long) size);
-+	if (!ptr)
-+		return ERR_PTR(-ENOMEM);
-+	return ptr;
-+}
-+
-+static void
-+xattr_free(void *ptr, size_t size)
-+{
-+	if (!size)	/* size request, no buffer was needed */
-+		return;
-+	else if (size <= PAGE_SIZE)
-+		kfree(ptr);
-+	else
-+		vfree(ptr);
-+}
-+#endif /* no xattr_alloc() and xattr_free() */
-+
-+/* BKL held by caller.
-+ * dentry->d_inode->i_sem down
-+ */
-+STATIC int
-+mini_fo_getxattr(struct dentry *dentry, const char *name, void *value, size_t size) {
-+	struct dentry *hidden_dentry = NULL;
-+	int err = -EOPNOTSUPP;
-+	/* Define these anyway so we don't need as much ifdef'ed code. */
-+	char *encoded_name = NULL;
-+	char *encoded_value = NULL;
-+
-+	check_mini_fo_dentry(dentry);
-+
-+	if(exists_in_storage(dentry))
-+		hidden_dentry = dtohd2(dentry);
-+	else
-+		hidden_dentry = dtohd(dentry);
-+
-+	ASSERT(hidden_dentry);
-+	ASSERT(hidden_dentry->d_inode);
-+	ASSERT(hidden_dentry->d_inode->i_op);
-+
-+	if (hidden_dentry->d_inode->i_op->getxattr) {
-+		encoded_name = (char *)name;
-+		encoded_value = (char *)value;
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+		mutex_lock(&hidden_dentry->d_inode->i_mutex);
-+#else
-+		down(&hidden_dentry->d_inode->i_sem);
-+#endif
-+		/* lock_kernel() already done by caller. */
-+		err = hidden_dentry->d_inode->i_op->getxattr(hidden_dentry, encoded_name, encoded_value, size);
-+		/* unlock_kernel() will be done by caller. */
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+		mutex_unlock(&hidden_dentry->d_inode->i_mutex);
-+#else
-+		up(&hidden_dentry->d_inode->i_sem);
-+#endif
-+	}
-+	return err;
-+}
-+
-+/* BKL held by caller.
-+ * dentry->d_inode->i_sem down
-+ */
-+STATIC int
-+#if ((LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,21) \
-+     && LINUX_VERSION_CODE <= KERNEL_VERSION(2,4,23)) \
-+     || LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
-+mini_fo_setxattr(struct dentry *dentry, const char *name,
-+		 const void *value, size_t size, int flags)
-+#else
-+mini_fo_setxattr(struct dentry *dentry, const char *name,
-+		 void *value, size_t size, int flags)
-+#endif
-+
-+{
-+	struct dentry *hidden_dentry = NULL;
-+	int err = -EOPNOTSUPP;
-+
-+	/* Define these anyway, so we don't have as much ifdef'ed code. */
-+	char *encoded_value = NULL;
-+	char *encoded_name = NULL;
-+
-+	check_mini_fo_dentry(dentry);
-+
-+	if(exists_in_storage(dentry))
-+		hidden_dentry = dtohd2(dentry);
-+	else
-+		hidden_dentry = dtohd(dentry);
-+
-+	ASSERT(hidden_dentry);
-+	ASSERT(hidden_dentry->d_inode);
-+	ASSERT(hidden_dentry->d_inode->i_op);
-+
-+	if (hidden_dentry->d_inode->i_op->setxattr) {
-+		encoded_name = (char *)name;
-+		encoded_value = (char *)value;
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+		mutex_lock(&hidden_dentry->d_inode->i_mutex);
-+#else
-+		down(&hidden_dentry->d_inode->i_sem);
-+#endif
-+		/* lock_kernel() already done by caller. */
-+		err = hidden_dentry->d_inode->i_op->setxattr(hidden_dentry, encoded_name, encoded_value, size, flags);
-+		/* unlock_kernel() will be done by caller. */
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+		mutex_unlock(&hidden_dentry->d_inode->i_mutex);
-+#else
-+		up(&hidden_dentry->d_inode->i_sem);
-+#endif
-+	}
-+	return err;
-+}
-+
-+/* BKL held by caller.
-+ * dentry->d_inode->i_sem down
-+ */
-+STATIC int
-+mini_fo_removexattr(struct dentry *dentry, const char *name) {
-+	struct dentry *hidden_dentry = NULL;
-+	int err = -EOPNOTSUPP;
-+	char *encoded_name;
-+
-+	check_mini_fo_dentry(dentry);
-+
-+	if(exists_in_storage(dentry))
-+		hidden_dentry = dtohd2(dentry);
-+	else
-+		hidden_dentry = dtohd(dentry);
-+
-+	ASSERT(hidden_dentry);
-+	ASSERT(hidden_dentry->d_inode);
-+	ASSERT(hidden_dentry->d_inode->i_op);
-+
-+	if (hidden_dentry->d_inode->i_op->removexattr) {
-+		encoded_name = (char *)name;
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+		mutex_lock(&hidden_dentry->d_inode->i_mutex);
-+#else
-+		down(&hidden_dentry->d_inode->i_sem);
-+#endif
-+		/* lock_kernel() already done by caller. */
-+		err = hidden_dentry->d_inode->i_op->removexattr(hidden_dentry, encoded_name);
-+		/* unlock_kernel() will be done by caller. */
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+		mutex_unlock(&hidden_dentry->d_inode->i_mutex);
-+#else
-+		up(&hidden_dentry->d_inode->i_sem);
-+#endif
-+	}
-+	return err;
-+}
-+
-+/* BKL held by caller.
-+ * dentry->d_inode->i_sem down
-+ */
-+STATIC int
-+mini_fo_listxattr(struct dentry *dentry, char *list, size_t size) {
-+	struct dentry *hidden_dentry = NULL;
-+	int err = -EOPNOTSUPP;
-+	char *encoded_list = NULL;
-+
-+	check_mini_fo_dentry(dentry);
-+
-+	if(exists_in_storage(dentry))
-+		hidden_dentry = dtohd2(dentry);
-+	else
-+		hidden_dentry = dtohd(dentry);
-+
-+	ASSERT(hidden_dentry);
-+	ASSERT(hidden_dentry->d_inode);
-+	ASSERT(hidden_dentry->d_inode->i_op);
-+
-+	if (hidden_dentry->d_inode->i_op->listxattr) {
-+		encoded_list = list;
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+		mutex_lock(&hidden_dentry->d_inode->i_mutex);
-+#else
-+		down(&hidden_dentry->d_inode->i_sem);
-+#endif
-+		/* lock_kernel() already done by caller. */
-+		err = hidden_dentry->d_inode->i_op->listxattr(hidden_dentry, encoded_list, size);
-+		/* unlock_kernel() will be done by caller. */
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+		mutex_unlock(&hidden_dentry->d_inode->i_mutex);
-+#else
-+		up(&hidden_dentry->d_inode->i_sem);
-+#endif
-+	}
-+	return err;
-+}
-+# endif /* defined(XATTR) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,20)) */
-+
-+struct inode_operations mini_fo_symlink_iops =
-+	{
-+		readlink:	mini_fo_readlink,
-+		follow_link: mini_fo_follow_link,
-+		/* mk: permission:	mini_fo_permission, */
-+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
-+		revalidate:	mini_fo_inode_revalidate,
-+#endif
-+		setattr:	mini_fo_setattr,
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+		getattr:	mini_fo_getattr,
-+		put_link:       mini_fo_put_link,
-+#endif
-+
-+#if defined(XATTR) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,20))
-+		setxattr:	mini_fo_setxattr,
-+		getxattr:	mini_fo_getxattr,
-+		listxattr:	mini_fo_listxattr,
-+		removexattr: mini_fo_removexattr
-+# endif /* defined(XATTR) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,20)) */
-+	};
-+
-+struct inode_operations mini_fo_dir_iops =
-+	{
-+		create:	mini_fo_create,
-+		lookup:	mini_fo_lookup,
-+		link:	mini_fo_link,
-+		unlink:	mini_fo_unlink,
-+		symlink:	mini_fo_symlink,
-+		mkdir:	mini_fo_mkdir,
-+		rmdir:	mini_fo_rmdir,
-+		mknod:	mini_fo_mknod,
-+		rename:	mini_fo_rename,
-+		/* no readlink/follow_link for non-symlinks */
-+		// off because we have setattr
-+		//    truncate:	mini_fo_truncate,
-+		/* mk:permission:	mini_fo_permission, */
-+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
-+		revalidate:	mini_fo_inode_revalidate,
-+#endif
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+		getattr:	mini_fo_getattr,
-+#endif
-+		setattr:	mini_fo_setattr,
-+#if defined(XATTR) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,20))
-+		setxattr:	mini_fo_setxattr,
-+		getxattr:	mini_fo_getxattr,
-+		listxattr:	mini_fo_listxattr,
-+		removexattr: mini_fo_removexattr
-+# endif /* XATTR && LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,20) */
-+	};
-+
-+struct inode_operations mini_fo_main_iops =
-+	{
-+		/* permission:	mini_fo_permission, */
-+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
-+		revalidate:	mini_fo_inode_revalidate,
-+#endif
-+		setattr:	mini_fo_setattr,
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+		getattr:	mini_fo_getattr,
-+#endif
-+#if defined(XATTR) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,20))
-+		setxattr:	mini_fo_setxattr,
-+		getxattr:	mini_fo_getxattr,
-+		listxattr:	mini_fo_listxattr,
-+		removexattr:    mini_fo_removexattr
-+# endif /* XATTR && LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,20) */
-+	};
---- /dev/null
-+++ b/fs/mini_fo/main.c
-@@ -0,0 +1,423 @@
-+/*
-+ * Copyright (c) 1997-2003 Erez Zadok
-+ * Copyright (c) 2001-2003 Stony Brook University
-+ *
-+ * For specific licensing information, see the COPYING file distributed with
-+ * this package, or get one from ftp://ftp.filesystems.org/pub/fist/COPYING.
-+ *
-+ * This Copyright notice must be kept intact and distributed with all
-+ * fistgen sources INCLUDING sources generated by fistgen.
-+ */
-+/*
-+ * Copyright (C) 2004, 2005 Markus Klotzbuecher <mk@creamnet.de>
-+ *
-+ * This program is free software; you can redistribute it and/or
-+ * modify it under the terms of the GNU General Public License
-+ * as published by the Free Software Foundation; either version
-+ * 2 of the License, or (at your option) any later version.
-+ */
-+
-+/*
-+ *  $Id$
-+ */
-+
-+#ifdef HAVE_CONFIG_H
-+# include <config.h>
-+#endif
-+
-+#include "fist.h"
-+#include "mini_fo.h"
-+#include <linux/module.h>
-+
-+/* This definition must only appear after we include <linux/module.h> */
-+#ifndef MODULE_LICENSE
-+# define MODULE_LICENSE(bison)
-+#endif /* not MODULE_LICENSE */
-+
-+/*
-+ * This is the mini_fo tri interpose function, which extends the
-+ * functionality of the regular interpose by interposing a higher
-+ * level inode on top of two lower level ones: the base filesystem
-+ * inode and the storage filesystem inode.
-+ *
-+ *  sb we pass is mini_fo's super_block
-+ */
-+int
-+mini_fo_tri_interpose(dentry_t *hidden_dentry,
-+		      dentry_t *hidden_sto_dentry,
-+		      dentry_t *dentry, super_block_t *sb, int flag)
-+{
-+	inode_t *hidden_inode = NULL;
-+	inode_t *hidden_sto_inode = NULL; /* store corresponding storage inode */
-+	int err = 0;
-+	inode_t *inode;
-+
-+	/* Pointer to hidden_sto_inode if exists, else to hidden_inode.
-+	 * This is used to copy the attributes of the correct inode. */
-+	inode_t *master_inode;
-+
-+	if(hidden_dentry)
-+		hidden_inode = hidden_dentry->d_inode;
-+	if(hidden_sto_dentry)
-+		hidden_sto_inode = hidden_sto_dentry->d_inode;
-+
-+	ASSERT(dentry->d_inode == NULL);
-+
-+	/* mk: One of the inodes associated with the dentrys is likely to
-+	 * be NULL, so carefull:
-+	 */
-+	ASSERT((hidden_inode != NULL) || (hidden_sto_inode != NULL));
-+
-+	if(hidden_sto_inode)
-+		master_inode = hidden_sto_inode;
-+	else
-+		master_inode = hidden_inode;
-+
-+	/*
-+	 * We allocate our new inode below, by calling iget.
-+	 * iget will call our read_inode which will initialize some
-+	 * of the new inode's fields
-+	 */
-+
-+	/*
-+	 * original: inode = iget(sb, hidden_inode->i_ino);
-+	 */
-+	inode = iget(sb, iunique(sb, 25));
-+	if (!inode) {
-+		err = -EACCES;		/* should be impossible??? */
-+		goto out;
-+	}
-+
-+	/*
-+	 * interpose the inode if not already interposed
-+	 *   this is possible if the inode is being reused
-+	 * XXX: what happens if we get_empty_inode() but there's another already?
-+	 * for now, ASSERT() that this can't happen; fix later.
-+	 */
-+	if (itohi(inode) != NULL) {
-+		printk(KERN_CRIT "mini_fo_tri_interpose: itohi(inode) != NULL.\n");
-+	}
-+	if (itohi2(inode) != NULL) {
-+		printk(KERN_CRIT "mini_fo_tri_interpose: itohi2(inode) != NULL.\n");
-+	}
-+
-+	/* mk: Carefull, igrab can't handle NULL inodes (ok, why should it?), so
-+	 * we need to check here:
-+	 */
-+	if(hidden_inode)
-+		itohi(inode) = igrab(hidden_inode);
-+	else
-+		itohi(inode) = NULL;
-+
-+	if(hidden_sto_inode)
-+		itohi2(inode) = igrab(hidden_sto_inode);
-+	else
-+		itohi2(inode) = NULL;
-+
-+
-+	/* Use different set of inode ops for symlinks & directories*/
-+	if (S_ISLNK(master_inode->i_mode))
-+		inode->i_op = &mini_fo_symlink_iops;
-+	else if (S_ISDIR(master_inode->i_mode))
-+		inode->i_op = &mini_fo_dir_iops;
-+
-+	/* Use different set of file ops for directories */
-+	if (S_ISDIR(master_inode->i_mode))
-+		inode->i_fop = &mini_fo_dir_fops;
-+
-+	/* properly initialize special inodes */
-+	if (S_ISBLK(master_inode->i_mode) || S_ISCHR(master_inode->i_mode) ||
-+	    S_ISFIFO(master_inode->i_mode) || S_ISSOCK(master_inode->i_mode)) {
-+		init_special_inode(inode, master_inode->i_mode, master_inode->i_rdev);
-+	}
-+
-+	/* Fix our inode's address operations to that of the lower inode */
-+	if (inode->i_mapping->a_ops != master_inode->i_mapping->a_ops) {
-+		inode->i_mapping->a_ops = master_inode->i_mapping->a_ops;
-+	}
-+
-+	/* only (our) lookup wants to do a d_add */
-+	if (flag)
-+		d_add(dentry, inode);
-+	else
-+		d_instantiate(dentry, inode);
-+
-+	ASSERT(dtopd(dentry) != NULL);
-+
-+	/* all well, copy inode attributes */
-+	fist_copy_attr_all(inode, master_inode);
-+
-+ out:
-+	return err;
-+}
-+
-+/* parse mount options "base=" and "sto=" */
-+dentry_t *
-+mini_fo_parse_options(super_block_t *sb, char *options)
-+{
-+	dentry_t *hidden_root = ERR_PTR(-EINVAL);
-+	dentry_t *hidden_root2 = ERR_PTR(-EINVAL);
-+	struct nameidata nd, nd2;
-+	char *name, *tmp, *end;
-+	int err = 0;
-+
-+	/* We don't want to go off the end of our arguments later on. */
-+	for (end = options; *end; end++);
-+
-+	while (options < end) {
-+		tmp = options;
-+		while (*tmp && *tmp != ',')
-+			tmp++;
-+		*tmp = '\0';
-+		if (!strncmp("base=", options, 5)) {
-+			name = options + 5;
-+			printk(KERN_INFO "mini_fo: using base directory: %s\n", name);
-+
-+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
-+			if (path_init(name, LOOKUP_FOLLOW, &nd))
-+				err = path_walk(name, &nd);
-+#else
-+			err = path_lookup(name, LOOKUP_FOLLOW, &nd);
-+#endif
-+			if (err) {
-+				printk(KERN_CRIT "mini_fo: error accessing hidden directory '%s'\n", name);
-+				hidden_root = ERR_PTR(err);
-+				goto out;
-+			}
-+			hidden_root = nd.dentry;
-+			stopd(sb)->base_dir_dentry = nd.dentry;
-+			stopd(sb)->hidden_mnt = nd.mnt;
-+
-+		} else if(!strncmp("sto=", options, 4)) {
-+			/* parse the storage dir */
-+			name = options + 4;
-+			printk(KERN_INFO "mini_fo: using storage directory: %s\n", name);
-+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
-+			if(path_init(name, LOOKUP_FOLLOW, &nd2))
-+				err = path_walk(name, &nd2);
-+#else
-+                        err = path_lookup(name, LOOKUP_FOLLOW, &nd2);
-+#endif
-+			if(err) {
-+				printk(KERN_CRIT "mini_fo: error accessing hidden storage directory '%s'\n", name);
-+
-+				hidden_root2 = ERR_PTR(err);
-+				goto out;
-+			}
-+			hidden_root2 = nd2.dentry;
-+			stopd(sb)->storage_dir_dentry = nd2.dentry;
-+			stopd(sb)->hidden_mnt2 = nd2.mnt;
-+			stohs2(sb) = hidden_root2->d_sb;
-+
-+			/* validate storage dir, this is done in
-+			 * mini_fo_read_super for the base directory.
-+			 */
-+			if (IS_ERR(hidden_root2)) {
-+				printk(KERN_WARNING "mini_fo_parse_options: storage dentry lookup failed (err = %ld)\n", PTR_ERR(hidden_root2));
-+				goto out;
-+			}
-+			if (!hidden_root2->d_inode) {
-+				printk(KERN_WARNING "mini_fo_parse_options: no storage dir to interpose on.\n");
-+				goto out;
-+			}
-+			stohs2(sb) = hidden_root2->d_sb;
-+		} else {
-+			printk(KERN_WARNING "mini_fo: unrecognized option '%s'\n", options);
-+			hidden_root = ERR_PTR(-EINVAL);
-+			goto out;
-+		}
-+		options = tmp + 1;
-+	}
-+
-+ out:
-+	if(IS_ERR(hidden_root2))
-+		return hidden_root2;
-+	return hidden_root;
-+}
-+
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+static int
-+#else
-+super_block_t *
-+#endif
-+mini_fo_read_super(super_block_t *sb, void *raw_data, int silent)
-+{
-+	dentry_t *hidden_root;
-+	int err = 0;
-+
-+	if (!raw_data) {
-+		printk(KERN_WARNING "mini_fo_read_super: missing argument\n");
-+		err = -EINVAL;
-+		goto out;
-+	}
-+	/*
-+	 * Allocate superblock private data
-+	 */
-+	__stopd(sb) = kmalloc(sizeof(struct mini_fo_sb_info), GFP_KERNEL);
-+	if (!stopd(sb)) {
-+		printk(KERN_WARNING "%s: out of memory\n", __FUNCTION__);
-+		err = -ENOMEM;
-+		goto out;
-+	}
-+	stohs(sb) = NULL;
-+
-+	hidden_root = mini_fo_parse_options(sb, raw_data);
-+	if (IS_ERR(hidden_root)) {
-+		printk(KERN_WARNING "mini_fo_read_super: lookup_dentry failed (err = %ld)\n", PTR_ERR(hidden_root));
-+		err = PTR_ERR(hidden_root);
-+		goto out_free;
-+	}
-+	if (!hidden_root->d_inode) {
-+		printk(KERN_WARNING "mini_fo_read_super: no directory to interpose on\n");
-+		goto out_free;
-+	}
-+	stohs(sb) = hidden_root->d_sb;
-+
-+	/*
-+	 * Linux 2.4.2-ac3 and beyond has code in
-+	 * mm/filemap.c:generic_file_write() that requires sb->s_maxbytes
-+	 * to be populated.  If not set, all write()s under that sb will
-+	 * return 0.
-+	 *
-+	 * Linux 2.4.4+ automatically sets s_maxbytes to MAX_NON_LFS;
-+	 * the filesystem should override it only if it supports LFS.
-+	 */
-+	/* non-SCA code is good to go with LFS */
-+	sb->s_maxbytes = hidden_root->d_sb->s_maxbytes;
-+
-+	sb->s_op = &mini_fo_sops;
-+	/*
-+	 * we can't use d_alloc_root if we want to use
-+	 * our own interpose function unchanged,
-+	 * so we simply replicate *most* of the code in d_alloc_root here
-+	 */
-+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
-+	sb->s_root = d_alloc(NULL, &(const struct qstr) { "/", 1, 0 });
-+#else
-+	sb->s_root = d_alloc(NULL, &(const struct qstr){hash: 0, name: "/", len : 1});
-+#endif
-+	if (IS_ERR(sb->s_root)) {
-+		printk(KERN_WARNING "mini_fo_read_super: d_alloc failed\n");
-+		err = -ENOMEM;
-+		goto out_dput;
-+	}
-+
-+	sb->s_root->d_op = &mini_fo_dops;
-+	sb->s_root->d_sb = sb;
-+	sb->s_root->d_parent = sb->s_root;
-+
-+	/* link the upper and lower dentries */
-+	__dtopd(sb->s_root) = (struct mini_fo_dentry_info *)
-+		kmalloc(sizeof(struct mini_fo_dentry_info), GFP_KERNEL);
-+	if (!dtopd(sb->s_root)) {
-+		err = -ENOMEM;
-+		goto out_dput2;
-+	}
-+	dtopd(sb->s_root)->state = MODIFIED;
-+	dtohd(sb->s_root) = hidden_root;
-+
-+	/* fanout relevant, interpose on storage root dentry too */
-+	dtohd2(sb->s_root) = stopd(sb)->storage_dir_dentry;
-+
-+	/* ...and call tri-interpose to interpose root dir inodes
-+	 * if (mini_fo_interpose(hidden_root, sb->s_root, sb, 0))
-+	 */
-+	if(mini_fo_tri_interpose(hidden_root, dtohd2(sb->s_root), sb->s_root, sb, 0))
-+		goto out_dput2;
-+
-+	/* initalize the wol list */
-+	itopd(sb->s_root->d_inode)->deleted_list_size = -1;
-+	itopd(sb->s_root->d_inode)->renamed_list_size = -1;
-+	meta_build_lists(sb->s_root);
-+
-+	goto out;
-+
-+ out_dput2:
-+	dput(sb->s_root);
-+ out_dput:
-+	dput(hidden_root);
-+	dput(dtohd2(sb->s_root)); /* release the hidden_sto_dentry too */
-+ out_free:
-+	kfree(stopd(sb));
-+	__stopd(sb) = NULL;
-+ out:
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+        return err;
-+#else
-+        if (err) {
-+		return ERR_PTR(err);
-+        } else {
-+		return sb;
-+        }
-+#endif
-+}
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
-+static int mini_fo_get_sb(struct file_system_type *fs_type,
-+					  int flags, const char *dev_name,
-+					  void *raw_data, struct vfsmount *mnt)
-+{
-+	return get_sb_nodev(fs_type, flags, raw_data, mini_fo_read_super, mnt);
-+}
-+#else
-+static struct super_block *mini_fo_get_sb(struct file_system_type *fs_type,
-+					  int flags, const char *dev_name,
-+					  void *raw_data)
-+{
-+	return get_sb_nodev(fs_type, flags, raw_data, mini_fo_read_super);
-+}
-+#endif
-+
-+void mini_fo_kill_block_super(struct super_block *sb)
-+{
-+	generic_shutdown_super(sb);
-+	/*
-+	 *      XXX: BUG: Halcrow: Things get unstable sometime after this point:
-+	 *      lib/rwsem-spinlock.c:127: spin_is_locked on uninitialized
-+	 *      fs/fs-writeback.c:402: spin_lock(fs/super.c:a0381828) already
-+	 *      locked by fs/fs-writeback.c/402
-+	 *
-+	 *      Apparently, someone's not releasing a lock on sb_lock...
-+	 */
-+}
-+
-+static struct file_system_type mini_fo_fs_type = {
-+	.owner          = THIS_MODULE,
-+	.name           = "mini_fo",
-+	.get_sb         = mini_fo_get_sb,
-+	.kill_sb        = mini_fo_kill_block_super,
-+	.fs_flags       = 0,
-+};
-+
-+
-+#else
-+static DECLARE_FSTYPE(mini_fo_fs_type, "mini_fo", mini_fo_read_super, 0);
-+#endif
-+
-+static int __init init_mini_fo_fs(void)
-+{
-+	printk("Registering mini_fo version $Id$\n");
-+	return register_filesystem(&mini_fo_fs_type);
-+}
-+static void __exit exit_mini_fo_fs(void)
-+{
-+	printk("Unregistering mini_fo version $Id$\n");
-+	unregister_filesystem(&mini_fo_fs_type);
-+}
-+
-+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
-+EXPORT_NO_SYMBOLS;
-+#endif
-+
-+MODULE_AUTHOR("Erez Zadok <ezk@cs.sunysb.edu>");
-+MODULE_DESCRIPTION("FiST-generated mini_fo filesystem");
-+MODULE_LICENSE("GPL");
-+
-+/* MODULE_PARM(fist_debug_var, "i"); */
-+/* MODULE_PARM_DESC(fist_debug_var, "Debug level"); */
-+
-+module_init(init_mini_fo_fs)
-+module_exit(exit_mini_fo_fs)
---- /dev/null
-+++ b/fs/mini_fo/Makefile
-@@ -0,0 +1,17 @@
-+#
-+# Makefile for mini_fo 2.4 and 2.6 Linux kernels
-+#
-+# Copyright (C) 2004, 2005 Markus Klotzbuecher <mk@creamnet.de>
-+#
-+# This program is free software; you can redistribute it and/or
-+# modify it under the terms of the GNU General Public License
-+# as published by the Free Software Foundation; either version
-+# 2 of the License, or (at your option) any later version.
-+#
-+
-+obj-$(CONFIG_MINI_FO) := mini_fo.o
-+mini_fo-objs   := meta.o dentry.o file.o inode.o main.o super.o state.o aux.o
-+
-+# dependencies
-+${mini_fo-objs}: mini_fo.h fist.h
-+
---- /dev/null
-+++ b/fs/mini_fo/meta.c
-@@ -0,0 +1,1000 @@
-+/*
-+ * Copyright (C) 2004, 2005 Markus Klotzbuecher <mk@creamnet.de>
-+ *
-+ * This program is free software; you can redistribute it and/or
-+ * modify it under the terms of the GNU General Public License
-+ * as published by the Free Software Foundation; either version
-+ * 2 of the License, or (at your option) any later version.
-+ */
-+
-+#ifdef HAVE_CONFIG_H
-+# include <config.h>
-+#endif /* HAVE_CONFIG_H */
-+#include "fist.h"
-+#include "mini_fo.h"
-+
-+int meta_build_lists(dentry_t *dentry)
-+{
-+	struct mini_fo_inode_info *inode_info;
-+
-+	dentry_t *meta_dentry = 0;
-+	file_t *meta_file = 0;
-+	mm_segment_t old_fs;
-+	void *buf;
-+
-+	int bytes, len;
-+	struct vfsmount *meta_mnt;
-+	char *entry;
-+
-+	inode_info = itopd(dentry->d_inode);
-+	if(!(inode_info->deleted_list_size == -1 &&
-+	     inode_info->renamed_list_size == -1)) {
-+		printk(KERN_CRIT "mini_fo: meta_build_lists: \
-+                                  Error, list(s) not virgin.\n");
-+		return -1;
-+	}
-+
-+	/* init our meta lists */
-+	INIT_LIST_HEAD(&inode_info->deleted_list);
-+	inode_info->deleted_list_size = 0;
-+
-+	INIT_LIST_HEAD(&inode_info->renamed_list);
-+	inode_info->renamed_list_size = 0;
-+
-+  	/* might there be a META-file? */
-+	if(dtohd2(dentry) && dtohd2(dentry)->d_inode) {
-+		meta_dentry = lookup_one_len(META_FILENAME,
-+					     dtohd2(dentry),
-+					     strlen(META_FILENAME));
-+		if(!meta_dentry->d_inode) {
-+			dput(meta_dentry);
-+			goto out_ok;
-+		}
-+		/* $%& err, is this correct? */
-+		meta_mnt = stopd(dentry->d_inode->i_sb)->hidden_mnt2;
-+		mntget(meta_mnt);
-+
-+
-+		/* open META-file for reading */
-+		meta_file = dentry_open(meta_dentry, meta_mnt, 0x0);
-+		if(!meta_file || IS_ERR(meta_file)) {
-+			printk(KERN_CRIT "mini_fo: meta_build_lists: \
-+                                          ERROR opening META file.\n");
-+			goto out_err;
-+		}
-+
-+		/* check if fs supports reading */
-+		if(!meta_file->f_op->read) {
-+			printk(KERN_CRIT "mini_fo: meta_build_lists: \
-+                                          ERROR, fs does not support reading.\n");
-+			goto out_err_close;
-+		}
-+
-+		/* allocate a page for transfering the data */
-+		buf = (void *) __get_free_page(GFP_KERNEL);
-+		if(!buf) {
-+			printk(KERN_CRIT "mini_fo: meta_build_lists: \
-+                                          ERROR, out of mem.\n");
-+			goto out_err_close;
-+		}
-+		meta_file->f_pos = 0;
-+		old_fs = get_fs();
-+		set_fs(KERNEL_DS);
-+		do {
-+			char *c;
-+			bytes = meta_file->f_op->read(meta_file, buf, PAGE_SIZE, &meta_file->f_pos);
-+			if(bytes == PAGE_SIZE) {
-+				/* trim a cut off filename and adjust f_pos to get it next time */
-+				for(c = (char*) buf+PAGE_SIZE;
-+				    *c != '\n';
-+				    c--, bytes--, meta_file->f_pos--);
-+			}
-+			entry = (char *) buf;
-+			while(entry < (char *) buf+bytes) {
-+
-+				char *old_path;
-+				char *dir_name;
-+				int old_len, new_len;
-+
-+				/* len without '\n'*/
-+				len = (int) (strchr(entry, '\n') - entry);
-+				switch (*entry) {
-+				case 'D':
-+					/* format: "D filename" */
-+					meta_list_add_d_entry(dentry,
-+							      entry+2,
-+							      len-2);
-+					break;
-+				case 'R':
-+					/* format: "R path/xy/dir newDir" */
-+					old_path = entry+2;
-+					dir_name = strchr(old_path, ' ') + 1;
-+					old_len =  dir_name - old_path - 1;
-+					new_len = ((int) entry) + len - ((int ) dir_name);
-+					meta_list_add_r_entry(dentry,
-+							      old_path,
-+							      old_len,
-+							      dir_name,
-+							      new_len);
-+					break;
-+				default:
-+					/* unknown entry type detected */
-+					break;
-+				}
-+				entry += len+1;
-+			}
-+
-+		} while(meta_file->f_pos < meta_dentry->d_inode->i_size);
-+
-+		free_page((unsigned long) buf);
-+		set_fs(old_fs);
-+		fput(meta_file);
-+	}
-+	goto out_ok;
-+
-+ out_err_close:
-+	fput(meta_file);
-+ out_err:
-+	mntput(meta_mnt);
-+	dput(meta_dentry);
-+	return -1;
-+ out_ok:
-+	return 1; /* check this!!! inode_info->wol_size; */
-+}
-+
-+/* cleanups up all lists and free's the mem by dentry */
-+int meta_put_lists(dentry_t *dentry)
-+{
-+	if(!dentry || !dentry->d_inode) {
-+		printk("mini_fo: meta_put_lists: invalid dentry passed.\n");
-+		return -1;
-+	}
-+	return __meta_put_lists(dentry->d_inode);
-+}
-+
-+/* cleanups up all lists and free's the mem by inode */
-+int __meta_put_lists(inode_t *inode)
-+{
-+	int err = 0;
-+	if(!inode || !itopd(inode)) {
-+		printk("mini_fo: __meta_put_lists: invalid inode passed.\n");
-+		return -1;
-+	}
-+	err = __meta_put_d_list(inode);
-+	err |= __meta_put_r_list(inode);
-+	return err;
-+}
-+
-+int meta_sync_lists(dentry_t *dentry)
-+{
-+	int err = 0;
-+	if(!dentry || !dentry->d_inode) {
-+		printk("mini_fo: meta_sync_lists: \
-+                        invalid dentry passed.\n");
-+		return -1;
-+	}
-+	err = meta_sync_d_list(dentry, 0);
-+	err |= meta_sync_r_list(dentry, 1);
-+	return err;
-+}
-+
-+
-+/* remove all D entries from the renamed list and free the mem */
-+int __meta_put_d_list(inode_t *inode)
-+{
-+	struct list_head *tmp;
-+        struct deleted_entry *del_entry;
-+        struct mini_fo_inode_info *inode_info;
-+
-+	if(!inode || !itopd(inode)) {
-+		printk(KERN_CRIT "mini_fo: __meta_put_d_list: \
-+                                  invalid inode passed.\n");
-+		return -1;
-+	}
-+	inode_info = itopd(inode);
-+
-+        /* nuke the DELETED-list */
-+        if(inode_info->deleted_list_size <= 0)
-+		return 0;
-+
-+	while(!list_empty(&inode_info->deleted_list)) {
-+		tmp = inode_info->deleted_list.next;
-+		list_del(tmp);
-+		del_entry = list_entry(tmp, struct deleted_entry, list);
-+		kfree(del_entry->name);
-+		kfree(del_entry);
-+	}
-+	inode_info->deleted_list_size = 0;
-+
-+	return 0;
-+}
-+
-+/* remove all R entries from the renamed list and free the mem */
-+int __meta_put_r_list(inode_t *inode)
-+{
-+	struct list_head *tmp;
-+	struct renamed_entry *ren_entry;
-+        struct mini_fo_inode_info *inode_info;
-+
-+	if(!inode || !itopd(inode)) {
-+		printk(KERN_CRIT "mini_fo: meta_put_r_list: invalid inode.\n");
-+		return -1;
-+	}
-+	inode_info = itopd(inode);
-+
-+        /* nuke the RENAMED-list */
-+        if(inode_info->renamed_list_size <= 0)
-+		return 0;
-+
-+	while(!list_empty(&inode_info->renamed_list)) {
-+		tmp = inode_info->renamed_list.next;
-+		list_del(tmp);
-+		ren_entry = list_entry(tmp, struct renamed_entry, list);
-+		kfree(ren_entry->new_name);
-+		kfree(ren_entry->old_name);
-+		kfree(ren_entry);
-+	}
-+	inode_info->renamed_list_size = 0;
-+
-+	return 0;
-+}
-+
-+int meta_add_d_entry(dentry_t *dentry, const char *name, int len)
-+{
-+	int err = 0;
-+	err = meta_list_add_d_entry(dentry, name, len);
-+	err |= meta_write_d_entry(dentry,name,len);
-+	return err;
-+}
-+
-+/* add a D entry to the deleted list */
-+int meta_list_add_d_entry(dentry_t *dentry, const char *name, int len)
-+{
-+        struct deleted_entry *del_entry;
-+        struct mini_fo_inode_info *inode_info;
-+
-+	if(!dentry || !dentry->d_inode) {
-+		printk(KERN_CRIT "mini_fo: meta_list_add_d_entry: \
-+                                  invalid dentry passed.\n");
-+		return -1;
-+	}
-+	inode_info = itopd(dentry->d_inode);
-+
-+        if(inode_info->deleted_list_size < 0)
-+                return -1;
-+
-+        del_entry = (struct deleted_entry *)
-+		kmalloc(sizeof(struct deleted_entry), GFP_KERNEL);
-+        del_entry->name = (char*) kmalloc(len, GFP_KERNEL);
-+        if(!del_entry || !del_entry->name) {
-+                printk(KERN_CRIT "mini_fo: meta_list_add_d_entry: \
-+                                  out of mem.\n");
-+		kfree(del_entry->name);
-+		kfree(del_entry);
-+                return -ENOMEM;
-+        }
-+
-+        strncpy(del_entry->name, name, len);
-+        del_entry->len = len;
-+
-+        list_add(&del_entry->list, &inode_info->deleted_list);
-+        inode_info->deleted_list_size++;
-+        return 0;
-+}
-+
-+int meta_add_r_entry(dentry_t *dentry,
-+			  const char *old_name, int old_len,
-+			  const char *new_name, int new_len)
-+{
-+	int err = 0;
-+	err = meta_list_add_r_entry(dentry,
-+				    old_name, old_len,
-+				    new_name, new_len);
-+	err |= meta_write_r_entry(dentry,
-+				  old_name, old_len,
-+				  new_name, new_len);
-+	return err;
-+}
-+
-+/* add a R entry to the renamed list */
-+int meta_list_add_r_entry(dentry_t *dentry,
-+			  const char *old_name, int old_len,
-+			  const char *new_name, int new_len)
-+{
-+        struct renamed_entry *ren_entry;
-+        struct mini_fo_inode_info *inode_info;
-+
-+	if(!dentry || !dentry->d_inode) {
-+		printk(KERN_CRIT "mini_fo: meta_list_add_r_entry: \
-+                                  invalid dentry passed.\n");
-+		return -1;
-+	}
-+	inode_info = itopd(dentry->d_inode);
-+
-+        if(inode_info->renamed_list_size < 0)
-+                return -1;
-+
-+        ren_entry = (struct renamed_entry *)
-+		kmalloc(sizeof(struct renamed_entry), GFP_KERNEL);
-+        ren_entry->old_name = (char*) kmalloc(old_len, GFP_KERNEL);
-+        ren_entry->new_name = (char*) kmalloc(new_len, GFP_KERNEL);
-+
-+        if(!ren_entry || !ren_entry->old_name || !ren_entry->new_name) {
-+                printk(KERN_CRIT "mini_fo: meta_list_add_r_entry: \
-+                                  out of mem.\n");
-+		kfree(ren_entry->new_name);
-+		kfree(ren_entry->old_name);
-+		kfree(ren_entry);
-+                return -ENOMEM;
-+        }
-+
-+        strncpy(ren_entry->old_name, old_name, old_len);
-+        ren_entry->old_len = old_len;
-+        strncpy(ren_entry->new_name, new_name, new_len);
-+        ren_entry->new_len = new_len;
-+
-+        list_add(&ren_entry->list, &inode_info->renamed_list);
-+        inode_info->renamed_list_size++;
-+        return 0;
-+}
-+
-+
-+int meta_remove_r_entry(dentry_t *dentry, const char *name, int len)
-+{
-+	int err = 0;
-+	if(!dentry || !dentry->d_inode) {
-+		printk(KERN_CRIT
-+		       "mini_fo: meta_remove_r_entry: \
-+                        invalid dentry passed.\n");
-+		return -1;
-+	}
-+
-+	err = meta_list_remove_r_entry(dentry, name, len);
-+	err |= meta_sync_lists(dentry);
-+	return err;
-+}
-+
-+int meta_list_remove_r_entry(dentry_t *dentry, const char *name, int len)
-+{
-+	if(!dentry || !dentry->d_inode) {
-+		printk(KERN_CRIT
-+		       "mini_fo: meta_list_remove_r_entry: \
-+                        invalid dentry passed.\n");
-+		return -1;
-+	}
-+	return __meta_list_remove_r_entry(dentry->d_inode, name, len);
-+}
-+
-+int __meta_list_remove_r_entry(inode_t *inode, const char *name, int len)
-+{
-+	struct list_head *tmp;
-+        struct renamed_entry *ren_entry;
-+        struct mini_fo_inode_info *inode_info;
-+
-+	if(!inode || !itopd(inode))
-+		printk(KERN_CRIT
-+		       "mini_fo: __meta_list_remove_r_entry: \
-+                        invalid inode passed.\n");
-+	inode_info = itopd(inode);
-+
-+        if(inode_info->renamed_list_size < 0)
-+                return -1;
-+        if(inode_info->renamed_list_size == 0)
-+                return 1;
-+
-+	list_for_each(tmp, &inode_info->renamed_list) {
-+		ren_entry = list_entry(tmp, struct renamed_entry, list);
-+		if(ren_entry->new_len != len)
-+			continue;
-+
-+		if(!strncmp(ren_entry->new_name, name, len)) {
-+			list_del(tmp);
-+			kfree(ren_entry->new_name);
-+			kfree(ren_entry->old_name);
-+			kfree(ren_entry);
-+			inode_info->renamed_list_size--;
-+			return 0;
-+		}
-+	}
-+	return 1;
-+}
-+
-+
-+/* append a single D entry to the meta file */
-+int meta_write_d_entry(dentry_t *dentry, const char *name, int len)
-+{
-+	dentry_t *meta_dentry = 0;
-+        file_t *meta_file = 0;
-+        mm_segment_t old_fs;
-+
-+        int bytes, err;
-+        struct vfsmount *meta_mnt = 0;
-+        char *buf;
-+
-+	err = 0;
-+
-+	if(itopd(dentry->d_inode)->deleted_list_size < 0) {
-+		err = -1;
-+		goto out;
-+	}
-+
-+	if(dtopd(dentry)->state == UNMODIFIED) {
-+                err = build_sto_structure(dentry->d_parent, dentry);
-+                if(err) {
-+                        printk(KERN_CRIT "mini_fo: meta_write_d_entry: \
-+                                          build_sto_structure failed.\n");
-+			goto out;
-+                }
-+        }
-+	meta_dentry = lookup_one_len(META_FILENAME,
-+				     dtohd2(dentry), strlen (META_FILENAME));
-+
-+	/* We need to create a META-file */
-+        if(!meta_dentry->d_inode) {
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+		vfs_create(dtohd2(dentry)->d_inode,
-+			   meta_dentry,
-+			   S_IRUSR | S_IWUSR,
-+			   NULL);
-+#else
-+                vfs_create(dtohd2(dentry)->d_inode,
-+			   meta_dentry,
-+			   S_IRUSR | S_IWUSR);
-+#endif
-+	}
-+        /* open META-file for writing */
-+        meta_file = dentry_open(meta_dentry, meta_mnt, 0x1);
-+        if(!meta_file || IS_ERR(meta_file)) {
-+                printk(KERN_CRIT "mini_fo: meta_write_d_entry: \
-+                                  ERROR opening meta file.\n");
-+                mntput(meta_mnt); /* $%& is this necessary? */
-+                dput(meta_dentry);
-+		err = -1;
-+                goto out;
-+        }
-+
-+        /* check if fs supports writing */
-+        if(!meta_file->f_op->write) {
-+                printk(KERN_CRIT "mini_fo: meta_write_d_entry: \
-+                                  ERROR, fs does not support writing.\n");
-+                goto out_err_close;
-+        }
-+
-+	meta_file->f_pos = meta_dentry->d_inode->i_size; /* append */
-+        old_fs = get_fs();
-+        set_fs(KERNEL_DS);
-+
-+	/* size: len for name, 1 for \n and 2 for "D " */
-+	buf = (char *) kmalloc(len+3, GFP_KERNEL);
-+	if (!buf) {
-+		printk(KERN_CRIT "mini_fo: meta_write_d_entry: \
-+                                  out of mem.\n");
-+		return -ENOMEM;
-+	}
-+
-+	buf[0] = 'D';
-+	buf[1] = ' ';
-+	strncpy(buf+2, name, len);
-+	buf[len+2] = '\n';
-+	bytes = meta_file->f_op->write(meta_file, buf, len+3,
-+				       &meta_file->f_pos);
-+	if(bytes != len+3) {
-+		printk(KERN_CRIT "mini_fo: meta_write_d_entry: \
-+                                  ERROR writing.\n");
-+		err = -1;
-+	}
-+	kfree(buf);
-+	set_fs(old_fs);
-+
-+ out_err_close:
-+	fput(meta_file);
-+ out:
-+	return err;
-+}
-+
-+/* append a single R entry to the meta file */
-+int meta_write_r_entry(dentry_t *dentry,
-+		       const char *old_name, int old_len,
-+		       const char *new_name, int new_len)
-+{
-+	dentry_t *meta_dentry = 0;
-+        file_t *meta_file = 0;
-+        mm_segment_t old_fs;
-+
-+        int bytes, err, buf_len;
-+	struct vfsmount *meta_mnt = 0;
-+        char *buf;
-+
-+
-+	err = 0;
-+
-+	if(itopd(dentry->d_inode)->renamed_list_size < 0) {
-+		err = -1;
-+		goto out;
-+	}
-+
-+	/* build the storage structure? */
-+	if(dtopd(dentry)->state == UNMODIFIED) {
-+                err = build_sto_structure(dentry->d_parent, dentry);
-+                if(err) {
-+                        printk(KERN_CRIT "mini_fo: meta_write_r_entry: \
-+                                          build_sto_structure failed.\n");
-+			goto out;
-+                }
-+        }
-+	meta_dentry = lookup_one_len(META_FILENAME,
-+				     dtohd2(dentry),
-+				     strlen (META_FILENAME));
-+        if(!meta_dentry->d_inode) {
-+                /* We need to create a META-file */
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+                vfs_create(dtohd2(dentry)->d_inode,
-+			   meta_dentry, S_IRUSR | S_IWUSR, NULL);
-+#else
-+                vfs_create(dtohd2(dentry)->d_inode,
-+			   meta_dentry, S_IRUSR | S_IWUSR);
-+#endif
-+	}
-+        /* open META-file for writing */
-+        meta_file = dentry_open(meta_dentry, meta_mnt, 0x1);
-+        if(!meta_file || IS_ERR(meta_file)) {
-+                printk(KERN_CRIT "mini_fo: meta_write_r_entry: \
-+                                  ERROR opening meta file.\n");
-+                mntput(meta_mnt);
-+                dput(meta_dentry);
-+		err = -1;
-+                goto out;
-+        }
-+
-+        /* check if fs supports writing */
-+        if(!meta_file->f_op->write) {
-+                printk(KERN_CRIT "mini_fo: meta_write_r_entry: \
-+                                  ERROR, fs does not support writing.\n");
-+                goto out_err_close;
-+        }
-+
-+	meta_file->f_pos = meta_dentry->d_inode->i_size; /* append */
-+        old_fs = get_fs();
-+        set_fs(KERNEL_DS);
-+
-+	/* size: 2 for "R ", old_len+new_len for names, 1 blank+1 \n */
-+	buf_len = old_len + new_len + 4;
-+	buf = (char *) kmalloc(buf_len, GFP_KERNEL);
-+	if (!buf) {
-+		printk(KERN_CRIT "mini_fo: meta_write_r_entry: out of mem.\n");
-+		return -ENOMEM;
-+	}
-+
-+	buf[0] = 'R';
-+	buf[1] = ' ';
-+	strncpy(buf + 2, old_name, old_len);
-+	buf[old_len + 2] = ' ';
-+	strncpy(buf + old_len + 3, new_name, new_len);
-+	buf[buf_len -1] = '\n';
-+	bytes = meta_file->f_op->write(meta_file, buf, buf_len, &meta_file->f_pos);
-+	if(bytes != buf_len) {
-+		printk(KERN_CRIT "mini_fo: meta_write_r_entry: ERROR writing.\n");
-+		err = -1;
-+	}
-+
-+	kfree(buf);
-+	set_fs(old_fs);
-+
-+ out_err_close:
-+	fput(meta_file);
-+ out:
-+	return err;
-+}
-+
-+/* sync D list to disk, append data if app_flag is 1 */
-+/* check the meta_mnt, which seems not to be used (properly)  */
-+
-+int meta_sync_d_list(dentry_t *dentry, int app_flag)
-+{
-+	dentry_t *meta_dentry;
-+        file_t *meta_file;
-+        mm_segment_t old_fs;
-+
-+        int bytes, err;
-+        struct vfsmount *meta_mnt;
-+        char *buf;
-+
-+	struct list_head *tmp;
-+        struct deleted_entry *del_entry;
-+        struct mini_fo_inode_info *inode_info;
-+
-+	err = 0;
-+	meta_file=0;
-+	meta_mnt=0;
-+
-+	if(!dentry || !dentry->d_inode) {
-+		printk(KERN_CRIT "mini_fo: meta_sync_d_list: \
-+                                  invalid inode passed.\n");
-+		err = -1;
-+		goto out;
-+	}
-+	inode_info = itopd(dentry->d_inode);
-+
-+        if(inode_info->deleted_list_size < 0) {
-+		err = -1;
-+		goto out;
-+	}
-+
-+	/* ok, there is something to sync */
-+
-+	/* build the storage structure? */
-+        if(!dtohd2(dentry) && !itohi2(dentry->d_inode)) {
-+                err = build_sto_structure(dentry->d_parent, dentry);
-+                if(err) {
-+                        printk(KERN_CRIT "mini_fo: meta_sync_d_list: \
-+                                          build_sto_structure failed.\n");
-+			goto out;
-+                }
-+        }
-+	meta_dentry = lookup_one_len(META_FILENAME,
-+				     dtohd2(dentry),
-+				     strlen(META_FILENAME));
-+        if(!meta_dentry->d_inode) {
-+                /* We need to create a META-file */
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+                vfs_create(dtohd2(dentry)->d_inode,
-+			   meta_dentry, S_IRUSR | S_IWUSR, NULL);
-+#else
-+                vfs_create(dtohd2(dentry)->d_inode,
-+			   meta_dentry, S_IRUSR | S_IWUSR);
-+#endif
-+		app_flag = 0;
-+	}
-+	/* need we truncate the meta file? */
-+	if(!app_flag) {
-+		struct iattr newattrs;
-+                newattrs.ia_size = 0;
-+                newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME;
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+		mutex_lock(&meta_dentry->d_inode->i_mutex);
-+#else
-+                down(&meta_dentry->d_inode->i_sem);
-+#endif
-+                err = notify_change(meta_dentry, &newattrs);
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+		mutex_unlock(&meta_dentry->d_inode->i_mutex);
-+#else
-+                up(&meta_dentry->d_inode->i_sem);
-+#endif
-+
-+                if(err || meta_dentry->d_inode->i_size != 0) {
-+                        printk(KERN_CRIT "mini_fo: meta_sync_d_list: \
-+                                          ERROR truncating meta file.\n");
-+                        goto out_err_close;
-+		}
-+	}
-+
-+        /* open META-file for writing */
-+        meta_file = dentry_open(meta_dentry, meta_mnt, 0x1);
-+        if(!meta_file || IS_ERR(meta_file)) {
-+                printk(KERN_CRIT "mini_fo: meta_sync_d_list: \
-+                                  ERROR opening meta file.\n");
-+		/* we don't mntget so we dont't mntput (for now)
-+		 * mntput(meta_mnt);
-+		 */
-+		dput(meta_dentry);
-+		err = -1;
-+                goto out;
-+        }
-+
-+        /* check if fs supports writing */
-+        if(!meta_file->f_op->write) {
-+                printk(KERN_CRIT "mini_fo: meta_sync_d_list: \
-+                                  ERROR, fs does not support writing.\n");
-+                goto out_err_close;
-+        }
-+
-+	meta_file->f_pos = meta_dentry->d_inode->i_size; /* append */
-+        old_fs = get_fs();
-+        set_fs(KERNEL_DS);
-+
-+	/* here we go... */
-+        list_for_each(tmp, &inode_info->deleted_list) {
-+		del_entry = list_entry(tmp, struct deleted_entry, list);
-+
-+		/* size: len for name, 1 for \n and 2 for "D " */
-+		buf = (char *) kmalloc(del_entry->len+3, GFP_KERNEL);
-+		if (!buf) {
-+			printk(KERN_CRIT "mini_fo: meta_sync_d_list: \
-+                                          out of mem.\n");
-+			return -ENOMEM;
-+		}
-+
-+		buf[0] = 'D';
-+		buf[1] = ' ';
-+		strncpy(buf+2, del_entry->name, del_entry->len);
-+		buf[del_entry->len+2] = '\n';
-+		bytes = meta_file->f_op->write(meta_file, buf,
-+					       del_entry->len+3,
-+					       &meta_file->f_pos);
-+		if(bytes != del_entry->len+3) {
-+			printk(KERN_CRIT "mini_fo: meta_sync_d_list: \
-+                                          ERROR writing.\n");
-+			err |= -1;
-+		}
-+		kfree(buf);
-+	}
-+	set_fs(old_fs);
-+
-+ out_err_close:
-+	fput(meta_file);
-+ out:
-+	return err;
-+
-+}
-+
-+int meta_sync_r_list(dentry_t *dentry, int app_flag)
-+{
-+	dentry_t *meta_dentry;
-+        file_t *meta_file;
-+        mm_segment_t old_fs;
-+
-+        int bytes, err, buf_len;
-+        struct vfsmount *meta_mnt;
-+        char *buf;
-+
-+	struct list_head *tmp;
-+        struct renamed_entry *ren_entry;
-+        struct mini_fo_inode_info *inode_info;
-+
-+	err = 0;
-+	meta_file=0;
-+	meta_mnt=0;
-+
-+	if(!dentry || !dentry->d_inode) {
-+		printk(KERN_CRIT "mini_fo: meta_sync_r_list: \
-+                                  invalid dentry passed.\n");
-+		err = -1;
-+		goto out;
-+	}
-+	inode_info = itopd(dentry->d_inode);
-+
-+        if(inode_info->deleted_list_size < 0) {
-+		err = -1;
-+		goto out;
-+	}
-+
-+	/* ok, there is something to sync */
-+
-+	/* build the storage structure? */
-+        if(!dtohd2(dentry) && !itohi2(dentry->d_inode)) {
-+                err = build_sto_structure(dentry->d_parent, dentry);
-+                if(err) {
-+                        printk(KERN_CRIT "mini_fo: meta_sync_r_list: \
-+                                          build_sto_structure failed.\n");
-+			goto out;
-+                }
-+        }
-+	meta_dentry = lookup_one_len(META_FILENAME,
-+				     dtohd2(dentry),
-+				     strlen(META_FILENAME));
-+        if(!meta_dentry->d_inode) {
-+                /* We need to create a META-file */
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+                vfs_create(dtohd2(dentry)->d_inode,
-+			   meta_dentry, S_IRUSR | S_IWUSR, NULL);
-+#else
-+                vfs_create(dtohd2(dentry)->d_inode,
-+			   meta_dentry, S_IRUSR | S_IWUSR);
-+#endif
-+		app_flag = 0;
-+	}
-+	/* need we truncate the meta file? */
-+	if(!app_flag) {
-+		struct iattr newattrs;
-+                newattrs.ia_size = 0;
-+                newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME;
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+		mutex_lock(&meta_dentry->d_inode->i_mutex);
-+#else
-+                down(&meta_dentry->d_inode->i_sem);
-+#endif
-+                err = notify_change(meta_dentry, &newattrs);
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+		mutex_unlock(&meta_dentry->d_inode->i_mutex);
-+#else
-+                up(&meta_dentry->d_inode->i_sem);
-+#endif
-+                if(err || meta_dentry->d_inode->i_size != 0) {
-+                        printk(KERN_CRIT "mini_fo: meta_sync_r_list: \
-+                                          ERROR truncating meta file.\n");
-+                        goto out_err_close;
-+		}
-+	}
-+
-+        /* open META-file for writing */
-+        meta_file = dentry_open(meta_dentry, meta_mnt, 0x1);
-+        if(!meta_file || IS_ERR(meta_file)) {
-+                printk(KERN_CRIT "mini_fo: meta_sync_r_list: \
-+                                  ERROR opening meta file.\n");
-+		/* we don't mntget so we dont't mntput (for now)
-+		 * mntput(meta_mnt);
-+		 */
-+		dput(meta_dentry);
-+		err = -1;
-+                goto out;
-+        }
-+
-+        /* check if fs supports writing */
-+        if(!meta_file->f_op->write) {
-+                printk(KERN_CRIT "mini_fo: meta_sync_r_list: \
-+                                  ERROR, fs does not support writing.\n");
-+                goto out_err_close;
-+        }
-+
-+	meta_file->f_pos = meta_dentry->d_inode->i_size; /* append */
-+        old_fs = get_fs();
-+        set_fs(KERNEL_DS);
-+
-+	/* here we go... */
-+        list_for_each(tmp, &inode_info->renamed_list) {
-+		ren_entry = list_entry(tmp, struct renamed_entry, list);
-+		/* size:
-+		 * 2 for "R ", old_len+new_len for names, 1 blank+1 \n */
-+		buf_len = ren_entry->old_len + ren_entry->new_len + 4;
-+		buf = (char *) kmalloc(buf_len, GFP_KERNEL);
-+		if (!buf) {
-+			printk(KERN_CRIT "mini_fo: meta_sync_r_list: \
-+                                          out of mem.\n");
-+			return -ENOMEM;
-+		}
-+		buf[0] = 'R';
-+		buf[1] = ' ';
-+		strncpy(buf + 2, ren_entry->old_name, ren_entry->old_len);
-+		buf[ren_entry->old_len + 2] = ' ';
-+		strncpy(buf + ren_entry->old_len + 3,
-+			ren_entry->new_name, ren_entry->new_len);
-+		buf[buf_len - 1] = '\n';
-+		bytes = meta_file->f_op->write(meta_file, buf,
-+					       buf_len, &meta_file->f_pos);
-+		if(bytes != buf_len) {
-+			printk(KERN_CRIT "mini_fo: meta_sync_r_list: \
-+                                          ERROR writing.\n");
-+			err |= -1;
-+		}
-+		kfree(buf);
-+	}
-+	set_fs(old_fs);
-+
-+ out_err_close:
-+	fput(meta_file);
-+ out:
-+	return err;
-+}
-+
-+int meta_check_d_entry(dentry_t *dentry, const char *name, int len)
-+{
-+	if(!dentry || !dentry->d_inode)
-+		printk(KERN_CRIT "mini_fo: meta_check_d_dentry: \
-+                                  invalid dentry passed.\n");
-+	return __meta_check_d_entry(dentry->d_inode, name, len);
-+}
-+
-+int __meta_check_d_entry(inode_t *inode, const char *name, int len)
-+{
-+	struct list_head *tmp;
-+        struct deleted_entry *del_entry;
-+        struct mini_fo_inode_info *inode_info;
-+
-+	if(!inode || !itopd(inode))
-+		printk(KERN_CRIT "mini_fo: __meta_check_d_dentry: \
-+                                  invalid inode passed.\n");
-+
-+        inode_info = itopd(inode);
-+
-+        if(inode_info->deleted_list_size <= 0)
-+                return 0;
-+
-+        list_for_each(tmp, &inode_info->deleted_list) {
-+		del_entry = list_entry(tmp, struct deleted_entry, list);
-+		if(del_entry->len != len)
-+			continue;
-+
-+		if(!strncmp(del_entry->name, name, len))
-+			return 1;
-+	}
-+	return 0;
-+}
-+
-+/*
-+ * check if file has been renamed and return path to orig. base dir.
-+ * Implements no error return values so far, what of course sucks.
-+ * String is null terminated.'
-+ */
-+char* meta_check_r_entry(dentry_t *dentry, const char *name, int len)
-+{
-+	if(!dentry || !dentry->d_inode) {
-+		printk(KERN_CRIT "mini_fo: meta_check_r_dentry: \
-+                                  invalid dentry passed.\n");
-+		return NULL;
-+	}
-+	return __meta_check_r_entry(dentry->d_inode, name, len);
-+}
-+
-+char* __meta_check_r_entry(inode_t *inode, const char *name, int len)
-+{
-+	struct list_head *tmp;
-+        struct renamed_entry *ren_entry;
-+        struct mini_fo_inode_info *inode_info;
-+	char *old_path;
-+
-+	if(!inode || !itopd(inode)) {
-+		printk(KERN_CRIT "mini_fo: meta_check_r_dentry: \
-+                                  invalid inode passed.\n");
-+		return NULL;
-+	}
-+	inode_info = itopd(inode);
-+
-+        if(inode_info->renamed_list_size <= 0)
-+                return NULL;
-+
-+        list_for_each(tmp, &inode_info->renamed_list) {
-+		ren_entry = list_entry(tmp, struct renamed_entry, list);
-+		if(ren_entry->new_len != len)
-+			continue;
-+
-+		if(!strncmp(ren_entry->new_name, name, len)) {
-+			old_path = (char *)
-+				kmalloc(ren_entry->old_len+1, GFP_KERNEL);
-+			strncpy(old_path,
-+				ren_entry->old_name,
-+				ren_entry->old_len);
-+			old_path[ren_entry->old_len]='\0';
-+			return old_path;
-+		}
-+	}
-+	return NULL;
-+}
-+
-+/*
-+ * This version only checks if entry exists and return:
-+ *     1 if exists,
-+ *     0 if not,
-+ *    -1 if error.
-+ */
-+int meta_is_r_entry(dentry_t *dentry, const char *name, int len)
-+{
-+	if(!dentry || !dentry->d_inode) {
-+		printk(KERN_CRIT "mini_fo: meta_check_r_dentry [2]: \
-+                                  invalid dentry passed.\n");
-+		return -1;
-+	}
-+	return __meta_is_r_entry(dentry->d_inode, name, len);
-+}
-+
-+int __meta_is_r_entry(inode_t *inode, const char *name, int len)
-+{
-+	struct list_head *tmp;
-+        struct renamed_entry *ren_entry;
-+        struct mini_fo_inode_info *inode_info;
-+
-+	if(!inode || !itopd(inode)) {
-+		printk(KERN_CRIT "mini_fo: meta_check_r_dentry [2]: \
-+                                  invalid inode passed.\n");
-+		return -1;
-+	}
-+	inode_info = itopd(inode);
-+
-+        if(inode_info->renamed_list_size <= 0)
-+                return -1;
-+
-+        list_for_each(tmp, &inode_info->renamed_list) {
-+		ren_entry = list_entry(tmp, struct renamed_entry, list);
-+		if(ren_entry->new_len != len)
-+			continue;
-+
-+		if(!strncmp(ren_entry->new_name, name, len))
-+			return 1;
-+	}
-+	return 0;
-+}
-+
---- /dev/null
-+++ b/fs/mini_fo/mini_fo.h
-@@ -0,0 +1,510 @@
-+/*
-+ * Copyright (c) 1997-2003 Erez Zadok
-+ * Copyright (c) 2001-2003 Stony Brook University
-+ *
-+ * For specific licensing information, see the COPYING file distributed with
-+ * this package, or get one from ftp://ftp.filesystems.org/pub/fist/COPYING.
-+ *
-+ * This Copyright notice must be kept intact and distributed with all
-+ * fistgen sources INCLUDING sources generated by fistgen.
-+ */
-+/*
-+ * Copyright (C) 2004, 2005 Markus Klotzbuecher <mk@creamnet.de>
-+ *
-+ * This program is free software; you can redistribute it and/or
-+ * modify it under the terms of the GNU General Public License
-+ * as published by the Free Software Foundation; either version
-+ * 2 of the License, or (at your option) any later version.
-+ */
-+
-+/*
-+ *  $Id$
-+ */
-+
-+#ifndef __MINI_FO_H_
-+#define __MINI_FO_H_
-+
-+#ifdef __KERNEL__
-+
-+/* META stuff */
-+#define META_FILENAME "META_dAfFgHE39ktF3HD2sr"
-+
-+/* use xattrs? */
-+#define XATTR
-+
-+/* File attributes that when changed, result in a file beeing copied to storage */
-+#define COPY_FLAGS ATTR_MODE | ATTR_UID | ATTR_GID | ATTR_SIZE
-+
-+/*
-+ * mini_fo filestates
-+ */
-+#define MODIFIED       1
-+#define UNMODIFIED     2
-+#define CREATED        3
-+#define DEL_REWRITTEN  4
-+#define DELETED        5
-+#define NON_EXISTANT   6
-+
-+/* fist file systems superblock magic */
-+# define MINI_FO_SUPER_MAGIC 0xf15f
-+
-+/*
-+ * STRUCTURES:
-+ */
-+
-+/* mini_fo inode data in memory */
-+struct mini_fo_inode_info {
-+	inode_t *wii_inode;
-+	inode_t *wii_inode2; /* pointer to storage inode */
-+
-+	/* META-data lists */
-+	/* deleted list, ex wol */
-+	struct list_head deleted_list;
-+	int deleted_list_size;
-+
-+	/* renamed list */
-+	struct list_head renamed_list;
-+	int renamed_list_size;
-+
-+	/* add other lists here ... */
-+};
-+
-+/* mini_fo dentry data in memory */
-+struct mini_fo_dentry_info {
-+	dentry_t *wdi_dentry;
-+	dentry_t *wdi_dentry2; /* pointer to  storage dentry */
-+	unsigned int state;  /* state of the mini_fo dentry */
-+};
-+
-+
-+/* mini_fo super-block data in memory */
-+struct mini_fo_sb_info {
-+	super_block_t *wsi_sb, *wsi_sb2; /* mk: might point to the same sb */
-+	struct vfsmount *hidden_mnt, *hidden_mnt2;
-+	dentry_t *base_dir_dentry;
-+	dentry_t *storage_dir_dentry;
-+	;
-+};
-+
-+/* readdir_data, readdir helper struct */
-+struct readdir_data {
-+	struct list_head ndl_list; /* linked list head ptr */
-+	int ndl_size; /* list size */
-+	int sto_done; /* flag to show that the storage dir entries have
-+		       * all been read an now follow base entries */
-+};
-+
-+/* file private data. */
-+struct mini_fo_file_info {
-+	struct file *wfi_file;
-+	struct file *wfi_file2; /* pointer to storage file */
-+	struct readdir_data rd;
-+};
-+
-+/* struct ndl_entry */
-+struct ndl_entry {
-+	struct list_head list;
-+	char *name;
-+	int len;
-+};
-+
-+/********************************
-+ *  META-data structures
-+ ********************************/
-+
-+/* deleted entry */
-+struct deleted_entry {
-+	struct list_head list;
-+	char *name;
-+	int len;
-+};
-+
-+/* renamed entry */
-+struct renamed_entry {
-+	struct list_head list;
-+	char *old_name;     /* old directory with full path */
-+	int old_len;        /* length of above string */
-+	char *new_name;     /* new directory name */
-+	int new_len;        /* length of above string */
-+};
-+
-+/* attr_change entry */
-+struct attr_change_entry {
-+	struct list_head list;
-+	char *name;
-+	int len;
-+};
-+
-+/* link entry */
-+struct link_entry {
-+	struct list_head list;
-+	int links_moved;
-+	int inum_base;
-+	int inum_sto;
-+	char *weird_name;
-+	int weird_name_len;
-+};
-+
-+
-+/* Some other stuff required for mini_fo_filldir64, copied from
-+ * fs/readdir.c
-+ */
-+
-+#define ROUND_UP64(x) (((x)+sizeof(u64)-1) & ~(sizeof(u64)-1))
-+#define NAME_OFFSET(de) ((int) ((de)->d_name - (char *) (de)))
-+
-+
-+struct linux_dirent64 {
-+        u64             d_ino;
-+        s64             d_off;
-+        unsigned short  d_reclen;
-+        unsigned char   d_type;
-+        char            d_name[0];
-+};
-+
-+
-+struct getdents_callback64 {
-+        struct linux_dirent64 * current_dir;
-+        struct linux_dirent64 * previous;
-+        int count;
-+        int error;
-+};
-+
-+struct linux_dirent {
-+	unsigned long   d_ino;
-+	unsigned long   d_off;
-+	unsigned short  d_reclen;
-+	char            d_name[1];
-+};
-+
-+struct getdents_callback {
-+	struct linux_dirent * current_dir;
-+	struct linux_dirent * previous;
-+	int count;
-+	int error;
-+};
-+
-+
-+/*
-+ * MACROS:
-+ */
-+
-+/* file TO private_data */
-+# define ftopd(file) ((struct mini_fo_file_info *)((file)->private_data))
-+# define __ftopd(file) ((file)->private_data)
-+/* file TO hidden_file */
-+# define ftohf(file) ((ftopd(file))->wfi_file)
-+# define ftohf2(file) ((ftopd(file))->wfi_file2)
-+
-+/* inode TO private_data */
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
-+# define itopd(ino) ((struct mini_fo_inode_info *)(ino)->i_private)
-+# define __itopd(ino) ((ino)->i_private)
-+#else
-+# define itopd(ino) ((struct mini_fo_inode_info *)(ino)->u.generic_ip)
-+# define __itopd(ino) ((ino)->u.generic_ip)
-+#endif
-+/* inode TO hidden_inode */
-+# define itohi(ino) (itopd(ino)->wii_inode)
-+# define itohi2(ino) (itopd(ino)->wii_inode2)
-+
-+/* superblock TO private_data */
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+# define stopd(super) ((struct mini_fo_sb_info *)(super)->s_fs_info)
-+# define __stopd(super) ((super)->s_fs_info)
-+#else
-+# define stopd(super) ((struct mini_fo_sb_info *)(super)->u.generic_sbp)
-+# define __stopd(super) ((super)->u.generic_sbp)
-+#endif
-+
-+/* unused? # define vfs2priv stopd */
-+/* superblock TO hidden_superblock */
-+
-+# define stohs(super) (stopd(super)->wsi_sb)
-+# define stohs2(super) (stopd(super)->wsi_sb2)
-+
-+/* dentry TO private_data */
-+# define dtopd(dentry) ((struct mini_fo_dentry_info *)(dentry)->d_fsdata)
-+# define __dtopd(dentry) ((dentry)->d_fsdata)
-+/* dentry TO hidden_dentry */
-+# define dtohd(dent) (dtopd(dent)->wdi_dentry)
-+# define dtohd2(dent) (dtopd(dent)->wdi_dentry2)
-+
-+/* dentry to state */
-+# define dtost(dent) (dtopd(dent)->state)
-+# define sbt(sb) ((sb)->s_type->name)
-+
-+#define IS_WRITE_FLAG(flag) (flag & (O_RDWR | O_WRONLY | O_APPEND))
-+#define IS_COPY_FLAG(flag) (flag & (COPY_FLAGS))
-+
-+/* macros to simplify non-SCA code */
-+#  define MALLOC_PAGE_POINTERS(hidden_pages, num_hidden_pages)
-+#  define MALLOC_PAGEDATA_POINTERS(hidden_pages_data, num_hidden_pages)
-+#  define FREE_PAGE_POINTERS(hidden_pages, num)
-+#  define FREE_PAGEDATA_POINTERS(hidden_pages_data, num)
-+#  define FOR_EACH_PAGE
-+#  define CURRENT_HIDDEN_PAGE hidden_page
-+#  define CURRENT_HIDDEN_PAGEDATA hidden_page_data
-+#  define CURRENT_HIDDEN_PAGEINDEX page->index
-+
-+/*
-+ * EXTERNALS:
-+ */
-+extern struct file_operations mini_fo_main_fops;
-+extern struct file_operations mini_fo_dir_fops;
-+extern struct inode_operations mini_fo_main_iops;
-+extern struct inode_operations mini_fo_dir_iops;
-+extern struct inode_operations mini_fo_symlink_iops;
-+extern struct super_operations mini_fo_sops;
-+extern struct dentry_operations mini_fo_dops;
-+extern struct vm_operations_struct mini_fo_shared_vmops;
-+extern struct vm_operations_struct mini_fo_private_vmops;
-+extern struct address_space_operations mini_fo_aops;
-+
-+#if 0 /* unused by mini_fo */
-+extern int mini_fo_interpose(dentry_t *hidden_dentry, dentry_t *this_dentry, super_block_t *sb, int flag);
-+#if defined(FIST_FILTER_DATA) || defined(FIST_FILTER_SCA)
-+extern page_t *mini_fo_get1page(file_t *file, int index);
-+extern int mini_fo_fill_zeros(file_t *file, page_t *page, unsigned from);
-+# endif /* FIST_FILTER_DATA || FIST_FILTER_SCA */
-+
-+
-+#  define mini_fo_hidden_dentry(d) __mini_fo_hidden_dentry(__FILE__,__FUNCTION__,__LINE__,(d))
-+#  define mini_fo_hidden_sto_dentry(d) __mini_fo_hidden_sto_dentry(__FILE__,__FUNCTION__,__LINE__,(d))
-+
-+extern dentry_t *__mini_fo_hidden_dentry(char *file, char *func, int line, dentry_t *this_dentry);
-+extern dentry_t *__mini_fo_hidden_sto_dentry(char *file, char *func, int line, dentry_t *this_dentry);
-+
-+extern int mini_fo_read_file(const char *filename, void *buf, int len);
-+extern int mini_fo_write_file(const char *filename, void *buf, int len);
-+extern dentry_t *fist_lookup(dentry_t *dir, const char *name, vnode_t **out, uid_t uid, gid_t gid);
-+#endif /* unused by mini_fo */
-+
-+/* state transition functions */
-+extern int nondir_unmod_to_mod(dentry_t *dentry, int cp_flag);
-+extern int nondir_del_rew_to_del(dentry_t *dentry);
-+extern int nondir_creat_to_del(dentry_t *dentry);
-+extern int nondir_mod_to_del(dentry_t *dentry);
-+extern int nondir_unmod_to_del(dentry_t *dentry);
-+
-+extern int dir_unmod_to_mod(dentry_t *dentry);
-+
-+/* rename specials */
-+extern int rename_directory(inode_t *old_dir, dentry_t *old_dentry, inode_t *new_dir, dentry_t *new_dentry);
-+extern int rename_nondir(inode_t *old_dir, dentry_t *old_dentry, inode_t *new_dir, dentry_t *new_dentry);
-+
-+/* misc stuff */
-+extern int mini_fo_tri_interpose(dentry_t *hidden_dentry,
-+				 dentry_t *hidden_sto_dentry,
-+				 dentry_t *dentry,
-+				 super_block_t *sb, int flag);
-+
-+extern int mini_fo_cp_cont(dentry_t *tgt_dentry, struct vfsmount *tgt_mnt,
-+			   dentry_t *src_dentry, struct vfsmount *src_mnt);
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+extern int mini_fo_create(inode_t *dir, dentry_t *dentry, int mode, struct nameidata *nd);
-+
-+extern int create_sto_nod(dentry_t *dentry, int mode, dev_t dev);
-+extern int create_sto_reg_file(dentry_t *dentry, int mode, struct nameidata *nd);
-+#else
-+extern int mini_fo_create(inode_t *dir, dentry_t *dentry, int mode);
-+
-+extern int create_sto_nod(dentry_t *dentry, int mode, int dev);
-+extern int create_sto_reg_file(dentry_t *dentry, int mode);
-+#endif
-+
-+extern int create_sto_dir(dentry_t *dentry, int mode);
-+
-+extern int exists_in_storage(dentry_t *dentry);
-+extern int is_mini_fo_existant(dentry_t *dentry);
-+extern int get_neg_sto_dentry(dentry_t *dentry);
-+extern int build_sto_structure(dentry_t *dir, dentry_t *dentry);
-+extern int get_mini_fo_bpath(dentry_t *dentry, char **bpath, int *bpath_len);
-+extern dentry_t *bpath_walk(super_block_t *sb, char *bpath);
-+extern int bpath_put(dentry_t *dentry);
-+
-+/* check_mini_fo types functions */
-+extern int check_mini_fo_dentry(dentry_t *dentry);
-+extern int check_mini_fo_file(file_t *file);
-+extern int check_mini_fo_inode(inode_t *inode);
-+
-+/* General meta functions, can be called from outside of meta.c */
-+extern int meta_build_lists(dentry_t *dentry);
-+extern int meta_put_lists(dentry_t *dentry);
-+extern int __meta_put_lists(inode_t *inode);
-+
-+extern int meta_add_d_entry(dentry_t *dentry, const char *name, int len);
-+extern int meta_add_r_entry(dentry_t *dentry,
-+			    const char *old_name, int old_len,
-+			    const char *new_name, int new_len);
-+
-+extern int meta_remove_r_entry(dentry_t *dentry, const char *name, int len);
-+
-+extern int meta_check_d_entry(dentry_t *dentry, const char *name, int len);
-+extern int __meta_check_d_entry(inode_t *inode, const char *name, int len);
-+
-+extern char* meta_check_r_entry(dentry_t *dentry, const char *name, int len);
-+extern char* __meta_check_r_entry(inode_t *inode, const char *name, int len);
-+extern int meta_is_r_entry(dentry_t *dentry, const char *name, int len);
-+extern int __meta_is_r_entry(inode_t *inode, const char *name, int len);
-+
-+/* Specific meta functions, should be called only inside meta.c */
-+extern int __meta_put_d_list(inode_t *inode);
-+extern int __meta_put_r_list(inode_t *inode);
-+
-+extern int meta_list_add_d_entry(dentry_t *dentry,
-+				 const char *name, int len);
-+extern int meta_list_add_r_entry(dentry_t *dentry,
-+				 const char *old_name, int old_len,
-+				 const char *new_name, int new_len);
-+
-+extern int meta_list_remove_r_entry(dentry_t *dentry,
-+				    const char *name, int len);
-+
-+extern int __meta_list_remove_r_entry(inode_t *inode,
-+				      const char *name, int len);
-+
-+extern int meta_write_d_entry(dentry_t *dentry, const char *name, int len);
-+extern int meta_write_r_entry(dentry_t *dentry,
-+			      const char *old_name, int old_len,
-+			      const char *new_name, int new_len);
-+
-+extern int meta_sync_lists(dentry_t *dentry);
-+extern int meta_sync_d_list(dentry_t *dentry, int app_flag);
-+extern int meta_sync_r_list(dentry_t *dentry, int app_flag);
-+
-+/* ndl stuff */
-+extern int ndl_add_entry(struct readdir_data *rd, const char *name, int len);
-+extern void ndl_put_list(struct readdir_data *rd);
-+extern int ndl_check_entry(struct readdir_data *rd,
-+			   const char *name, int len);
-+
-+
-+# define copy_inode_size(dst, src) \
-+    dst->i_size = src->i_size; \
-+    dst->i_blocks = src->i_blocks;
-+
-+static inline void
-+fist_copy_attr_atime(inode_t *dest, const inode_t *src)
-+{
-+	ASSERT(dest != NULL);
-+	ASSERT(src != NULL);
-+	dest->i_atime = src->i_atime;
-+}
-+static inline void
-+fist_copy_attr_times(inode_t *dest, const inode_t *src)
-+{
-+	ASSERT(dest != NULL);
-+	ASSERT(src != NULL);
-+	dest->i_atime = src->i_atime;
-+	dest->i_mtime = src->i_mtime;
-+	dest->i_ctime = src->i_ctime;
-+}
-+static inline void
-+fist_copy_attr_timesizes(inode_t *dest, const inode_t *src)
-+{
-+	ASSERT(dest != NULL);
-+	ASSERT(src != NULL);
-+	dest->i_atime = src->i_atime;
-+	dest->i_mtime = src->i_mtime;
-+	dest->i_ctime = src->i_ctime;
-+	copy_inode_size(dest, src);
-+}
-+static inline void
-+fist_copy_attr_all(inode_t *dest, const inode_t *src)
-+{
-+	ASSERT(dest != NULL);
-+	ASSERT(src != NULL);
-+	dest->i_mode = src->i_mode;
-+	dest->i_nlink = src->i_nlink;
-+	dest->i_uid = src->i_uid;
-+	dest->i_gid = src->i_gid;
-+	dest->i_rdev = src->i_rdev;
-+	dest->i_atime = src->i_atime;
-+	dest->i_mtime = src->i_mtime;
-+	dest->i_ctime = src->i_ctime;
-+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
-+	dest->i_blksize = src->i_blksize;
-+#endif
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,12)
-+	dest->i_blkbits = src->i_blkbits;
-+# endif /* linux 2.4.12 and newer */
-+	copy_inode_size(dest, src);
-+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
-+	dest->i_attr_flags = src->i_attr_flags;
-+#else
-+	dest->i_flags = src->i_flags;
-+#endif
-+}
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+/* copied from linux/fs.h */
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+static inline void double_lock(struct dentry *d1, struct dentry *d2)
-+{
-+	struct mutex *m1 = &d1->d_inode->i_mutex;
-+	struct mutex *m2 = &d2->d_inode->i_mutex;
-+	if (m1 != m2) {
-+		if ((unsigned long) m1 < (unsigned long) m2) {
-+			struct mutex *tmp = m2;
-+			m2 = m1; m1 = tmp;
-+		}
-+		mutex_lock(m1);
-+	}
-+	mutex_lock(m2);
-+}
-+
-+static inline void double_unlock(struct dentry *d1, struct dentry *d2)
-+{
-+	struct mutex *m1 = &d1->d_inode->i_mutex;
-+	struct mutex *m2 = &d2->d_inode->i_mutex;
-+	mutex_unlock(m1);
-+	if (m1 != m2)
-+		mutex_unlock(m2);
-+	dput(d1);
-+	dput(d2);
-+}
-+
-+#else
-+static inline void double_down(struct semaphore *s1, struct semaphore *s2)
-+{
-+        if (s1 != s2) {
-+                if ((unsigned long) s1 < (unsigned long) s2) {
-+                        struct semaphore *tmp = s2;
-+                        s2 = s1; s1 = tmp;
-+                }
-+                down(s1);
-+        }
-+        down(s2);
-+}
-+
-+static inline void double_up(struct semaphore *s1, struct semaphore *s2)
-+{
-+        up(s1);
-+        if (s1 != s2)
-+                up(s2);
-+}
-+
-+static inline void double_lock(struct dentry *d1, struct dentry *d2)
-+{
-+        double_down(&d1->d_inode->i_sem, &d2->d_inode->i_sem);
-+}
-+
-+static inline void double_unlock(struct dentry *d1, struct dentry *d2)
-+{
-+        double_up(&d1->d_inode->i_sem,&d2->d_inode->i_sem);
-+        dput(d1);
-+        dput(d2);
-+}
-+#endif   /* if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16) */
-+#endif  /* if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0) */
-+#endif /* __KERNEL__ */
-+
-+/*
-+ * Definitions for user and kernel code
-+ */
-+
-+/* ioctls */
-+
-+#endif	/* not __MINI_FO_H_ */
---- /dev/null
-+++ b/fs/mini_fo/mini_fo-merge
-@@ -0,0 +1,180 @@
-+#!/bin/bash
-+#
-+# Copyright (C) 2005 Markus Klotzbuecher <mk@creamnet.de>
-+# This program is free software; you can redistribute it and/or
-+# modify it under the terms of the GNU General Public License
-+# as published by the Free Software Foundation; either version
-+# 2 of the License, or (at your option) any later version.
-+#
-+
-+BASE=
-+STO=
-+HELP=
-+DRYRUN=
-+VERBOSE=
-+TMP="/tmp/"
-+META_NAME="META_dAfFgHE39ktF3HD2sr"
-+SKIP_DEL_LIST="skip-delete-list.mini_fo-merge"
-+
-+COMMAND=
-+exec_command()
-+{
-+    if [ x$DRYRUN == "xset" ]; then
-+	echo "  would run: $COMMAND"
-+    elif ! [ x$DRYRUN == "xset" ]; then
-+	if [ x$VERBOSE == "xset" ]; then
-+	    echo "  running: $COMMAND"
-+	fi
-+	eval $COMMAND
-+    fi
-+}
-+
-+usage()
-+{
-+cat <<EOF
-+
-+USAGE: $0 -b <base dir> -s <storage dir>
-+Version 0.1
-+
-+This script merges the contents of a mini_fo storage file system back
-+to the base file system.
-+
-+!!! Warning: This will modify the base filesystem and can destroy data
-+             if used wrongly.
-+
-+Options:
-+     -b <base dir>
-+          the directory of the base file system.
-+
-+     -s <storage dir>
-+          the directory of the storage file system.
-+
-+     -d   dry run, will not change anything and print the commands that
-+          would be executed.
-+
-+     -t   tmp dir for storing temporary file. default: $TMP
-+
-+     -v   show what operations are performed.
-+
-+     -h   displays this message.
-+
-+EOF
-+}
-+
-+# parse parameters
-+while getopts hdvt:b:s: OPTS
-+  do
-+  case $OPTS in
-+      h)  HELP="set";;
-+      d)  DRYRUN="set";;
-+      v)  VERBOSE="set";;
-+      b)  BASE="$OPTARG";;
-+      s)  STO="$OPTARG";;
-+      t)  TMP="$OPTARG";;
-+      ?)  usage
-+	  exit 1;;
-+  esac
-+done
-+
-+if [ "x$HELP" == "xset" ]; then
-+    usage
-+    exit -1
-+fi
-+
-+if ! [ -d "$BASE" ] || ! [ -d "$STO" ]; then
-+    echo -e "$0:\n Error, -s and/or -b argument missing. type $0 -h for help."
-+    exit -1;
-+fi
-+
-+# get full paths
-+pushd $STO; STO=`pwd`; popd
-+pushd $BASE; BASE=`pwd`; popd
-+TMP=${TMP%/}
-+
-+
-+cat<<EOF
-+###############################################################################
-+# mini_fo-merge
-+#
-+# base dir:       $BASE
-+# storage dir:    $STO
-+# meta filename:  $META_NAME
-+# dry run:        $DRYRUN
-+# verbose:        $VERBOSE
-+# tmp files:      $TMP
-+###############################################################################
-+
-+EOF
-+
-+rm $TMP/$SKIP_DEL_LIST
-+
-+# first process all renamed dirs
-+echo "Merging renamed directories..."
-+pushd $STO &> /dev/null
-+find . -name $META_NAME -type f -print0  | xargs -0 -e grep  -e '^R ' | tr -s ':R' ' ' | while read ENTRY; do
-+    echo "entry: $ENTRY"
-+    META_FILE=`echo $ENTRY | cut -d ' ' -f 1`
-+    OLD_B_DIR=`echo $ENTRY | cut -d ' ' -f 2 | sed -e 's/\///'`
-+    NEW_NAME=`echo $ENTRY | cut -d ' ' -f 3`
-+    NEW_B_DIR=`echo $META_FILE | sed -e "s/$META_NAME/$NEW_NAME/" | sed -e 's/^\.\///'`
-+    echo "META_FILE: $META_FILE"
-+    echo "OLD_B_DIR: $OLD_B_DIR"
-+    echo "NEW_NAME: $NEW_NAME"
-+    echo  "NEW_B_DIR: $NEW_B_DIR"
-+
-+    pushd $BASE &> /dev/null
-+    # remove an existing dir in storage
-+    COMMAND="rm -rf $NEW_B_DIR"; exec_command
-+    COMMAND="cp -R $OLD_B_DIR $NEW_B_DIR"; exec_command
-+    echo ""
-+    popd &> /dev/null
-+
-+    # remember this dir to exclude it from deleting later
-+    echo $NEW_B_DIR >> $TMP/$SKIP_DEL_LIST
-+done
-+
-+# delete all whiteouted files from base
-+echo -e "\nDeleting whiteout'ed files from base file system..."
-+find . -name $META_NAME -type f -print0  | xargs -0 -e grep  -e '^D ' | sed -e 's/:D//' | while read ENTRY; do
-+    META_FILE=`echo $ENTRY | cut -d ' ' -f 1`
-+    DEL_NAME=`echo $ENTRY | cut -d ' ' -f 2`
-+    DEL_FILE=`echo $META_FILE | sed -e "s/$META_NAME/$DEL_NAME/" | sed -e 's/^\.\///'`
-+    grep -x $DEL_FILE $TMP/$SKIP_DEL_LIST &> /dev/null
-+    if [ $? -ne 0 ]; then
-+	pushd $BASE &> /dev/null
-+	COMMAND="rm -rf $DEL_FILE"; exec_command
-+	popd &> /dev/null
-+    else
-+	echo "  excluding: $DEL_FILE as in skip-del-list."
-+    fi
-+done
-+
-+# create all dirs and update permissions
-+echo -e "\nSetting up directory structures in base file system..."
-+find . -type d | sed -e 's/^\.\///' | while read DIR; do
-+    PERMS=`stat -c %a $DIR`
-+    DIR_UID=`stat -c %u $DIR`
-+    DIR_GID=`stat -c %g $DIR`
-+    pushd $BASE &> /dev/null
-+    if ! [ -d $DIR ]; then
-+	COMMAND="mkdir -p $DIR"; exec_command
-+    fi
-+    COMMAND="chmod $PERMS $DIR"; exec_command
-+    COMMAND="chown $DIR_UID:$DIR_GID $DIR"; exec_command
-+    popd &> /dev/null
-+done
-+
-+# merge all non-directory files
-+echo -e "\nMerging all non-directory files...."
-+for i in b c p f l s; do
-+    find . -type $i | sed -e 's/^\.\///' | grep -v "$META_NAME" | while read FILE; do
-+	pushd $BASE #&> /dev/null
-+	COMMAND="cp -df $STO/$FILE $BASE/$FILE"; exec_command
-+	popd &> /dev/null
-+    done
-+done
-+popd &> /dev/null
-+
-+#rm $TMP/$SKIP_DEL_LIST
-+
-+echo "Done!"
---- /dev/null
-+++ b/fs/mini_fo/mini_fo-overlay
-@@ -0,0 +1,130 @@
-+#!/bin/bash
-+#
-+# Copyright (C) 2005 Markus Klotzbuecher <mk@creamnet.de>
-+# This program is free software; you can redistribute it and/or
-+# modify it under the terms of the GNU General Public License
-+# as published by the Free Software Foundation; either version
-+# 2 of the License, or (at your option) any later version.
-+#
-+
-+HELP=
-+SUFF=
-+MNTP=
-+MNT_DIR="/mnt"
-+STO=
-+STO_DIR="/tmp"
-+BASE=
-+
-+usage()
-+{
-+cat <<EOF
-+
-+Usage: $0 [-s suffix] [-d sto_dir_dir] [-m mount point] base_dir
-+Version 0.1
-+
-+This script overlays the given base directory using the mini_fo file
-+system. If only the base directory base_dir is given, $0
-+will use a storage directory called "sto-<base_dir_name>" in $STO_DIR,
-+and mount point "mini_fo-<base_dir_dir>" in $MNT_DIR.
-+
-+Options:
-+     -s <suffix>
-+          add given suffix to storage directory and the mount
-+          point. This is usefull for overlaying one base directory
-+          several times and avoiding conflicts with storage directory
-+          names and mount points.
-+
-+     -d <sto_dir_dir>
-+          change the directory in which the storage directory will be
-+          created (default is currently "$STO_DIR".
-+
-+     -m <mount point>
-+          use an alternative directory to create the mini_fo
-+          mountpoint (default is currently "$MNT_DIR".
-+
-+     -h   displays this message.
-+
-+EOF
-+exit 1;
-+}
-+
-+while getopts hm:s:d: OPTS
-+  do
-+  case $OPTS in
-+      s)  SUFF="$OPTARG";;
-+      d)  STO_DIR="$OPTARG";;
-+      m)  MNT_DIR="$OPTARG";;
-+      h)  HELP="set";;
-+      ?)  usage
-+	  exit 1;;
-+  esac
-+done
-+shift $(($OPTIND - 1))
-+
-+BASE="$1"
-+
-+if [ "x$HELP" == "xset" ]; then
-+    usage
-+    exit -1
-+fi
-+
-+# fix suffix
-+if [ "x$SUFF" != "x" ]; then
-+    SUFF="-$SUFF"
-+fi
-+
-+# kill trailing slashes
-+MNT_DIR=${MNT_DIR%/}
-+STO_DIR=${STO_DIR%/}
-+BASE=${BASE%/}
-+
-+
-+if ! [ -d "$BASE" ]; then
-+    echo "invalid base dir $BASE, run $0 -h for help."
-+    exit -1
-+fi
-+
-+# check opts
-+if ! [ -d "$MNT_DIR" ]; then
-+    echo "invalid mount dir $MNT_DIR, run $0 -h for help."
-+    exit -1
-+fi
-+
-+if ! [ -d "$STO_DIR" ]; then
-+    echo "invalid sto_dir_dir $STO_DIR, run $0 -h for help."
-+    exit -1
-+fi
-+
-+MNTP="$MNT_DIR/mini_fo-`basename $BASE`$SUFF"
-+STO="$STO_DIR/sto-`basename $BASE`$SUFF"
-+
-+# create the mount point if it doesn't exist
-+mkdir -p $MNTP
-+if [ $? -ne 0 ]; then
-+    echo "Error, failed to create mount point $MNTP"
-+fi
-+
-+mkdir -p $STO
-+if [ $? -ne 0 ]; then
-+    echo "Error, failed to create storage dir $STO"
-+fi
-+
-+# check if fs is already mounted
-+mount | grep mini_fo | grep $MNTP &> /dev/null
-+if [ $? -eq 0 ]; then
-+    echo "Error, existing mini_fo mount at $MNTP."
-+    exit -1
-+fi
-+
-+mount | grep mini_fo | grep $STO &> /dev/null
-+if [ $? -eq 0 ]; then
-+    echo "Error, $STO seems to be used already."
-+    exit -1
-+fi
-+
-+# mount
-+mount -t mini_fo -o base=$BASE,sto=$STO $BASE $MNTP
-+
-+if [ $? -ne 0 ]; then
-+    echo "Error, mounting failed, maybe no permisson to mount?"
-+fi
---- /dev/null
-+++ b/fs/mini_fo/mmap.c
-@@ -0,0 +1,637 @@
-+/*
-+ * Copyright (c) 1997-2003 Erez Zadok
-+ * Copyright (c) 2001-2003 Stony Brook University
-+ *
-+ * For specific licensing information, see the COPYING file distributed with
-+ * this package, or get one from ftp://ftp.filesystems.org/pub/fist/COPYING.
-+ *
-+ * This Copyright notice must be kept intact and distributed with all
-+ * fistgen sources INCLUDING sources generated by fistgen.
-+ */
-+/*
-+ * Copyright (C) 2004, 2005 Markus Klotzbuecher <mk@creamnet.de>
-+ *
-+ * This program is free software; you can redistribute it and/or
-+ * modify it under the terms of the GNU General Public License
-+ * as published by the Free Software Foundation; either version
-+ * 2 of the License, or (at your option) any later version.
-+ */
-+
-+/*
-+ *  $Id$
-+ */
-+
-+#ifdef HAVE_CONFIG_H
-+# include <config.h>
-+#endif /* HAVE_CONFIG_H */
-+
-+#include "fist.h"
-+#include "mini_fo.h"
-+
-+
-+#ifdef FIST_COUNT_WRITES
-+/* for counting writes in the middle vs. regular writes */
-+unsigned long count_writes = 0, count_writes_middle = 0;
-+#endif /* FIST_COUNT_WRITES */
-+
-+/* forward declaration of commit write and prepare write */
-+STATIC int mini_fo_commit_write(file_t *file, page_t *page, unsigned from, unsigned to);
-+STATIC int mini_fo_prepare_write(file_t *file, page_t *page, unsigned from, unsigned to);
-+
-+
-+/*
-+ * Function for handling creation of holes when lseek-ing past the
-+ * end of the file and then writing some data.
-+ */
-+int
-+mini_fo_fill_zeros(file_t* file, page_t *page, unsigned from)
-+{
-+	int err = 0;
-+	dentry_t *dentry = file->f_dentry;
-+	inode_t *inode = dentry->d_inode;
-+	page_t *tmp_page;
-+	int index;
-+
-+	print_entry_location();
-+
-+	for (index = inode->i_size >> PAGE_CACHE_SHIFT; index < page->index; index++) {
-+		tmp_page = mini_fo_get1page(file, index);
-+		if (IS_ERR(tmp_page)) {
-+			err = PTR_ERR(tmp_page);
-+			goto out;
-+		}
-+
-+		/*
-+		 * zero out rest of the contents of the page between the appropriate
-+		 * offsets.
-+		 */
-+		memset((char*)page_address(tmp_page) + (inode->i_size & ~PAGE_CACHE_MASK), 0, PAGE_CACHE_SIZE - (inode->i_size & ~PAGE_CACHE_MASK));
-+
-+		if (! (err = mini_fo_prepare_write(file, tmp_page, 0, PAGE_CACHE_SIZE)))
-+			err = mini_fo_commit_write(file, tmp_page, 0, PAGE_CACHE_SIZE);
-+
-+		page_cache_release(tmp_page);
-+		if (err < 0)
-+			goto out;
-+		if (current->need_resched)
-+			schedule();
-+	}
-+
-+	/* zero out appropriate parts of last page */
-+
-+	/*
-+	 * if the encoding type is block, then adjust the 'from' (where the
-+	 * zeroing will start) offset appropriately
-+	 */
-+	from = from & (~(FIST_ENCODING_BLOCKSIZE - 1));
-+
-+	if ((from - (inode->i_size & ~PAGE_CACHE_MASK)) > 0) {
-+
-+		memset((char*)page_address(page) + (inode->i_size & ~PAGE_CACHE_MASK), 0, from - (inode->i_size & ~PAGE_CACHE_MASK));
-+		if (! (err = mini_fo_prepare_write(file, page, 0, PAGE_CACHE_SIZE)))
-+			err = mini_fo_commit_write(file, page, 0, PAGE_CACHE_SIZE);
-+
-+		if (err < 0)
-+			goto out;
-+		if (current->need_resched)
-+			schedule();
-+	}
-+
-+ out:
-+	print_exit_status(err);
-+	return err;
-+}
-+
-+
-+
-+STATIC int
-+mini_fo_writepage(page_t *page)
-+{
-+	int err = -EIO;
-+	inode_t *inode;
-+	inode_t *hidden_inode;
-+	page_t *hidden_page;
-+	char *kaddr, *hidden_kaddr;
-+
-+	print_entry_location();
-+
-+	inode = page->mapping->host;
-+	hidden_inode = itohi(inode);
-+
-+	/*
-+	 * writepage is called when shared mmap'ed files need to write
-+	 * their pages, while prepare/commit_write are called from the
-+	 * non-paged write() interface.  (However, in 2.3 the two interfaces
-+	 * share the same cache, while in 2.2 they didn't.)
-+	 *
-+	 * So we pretty much have to duplicate much of what commit_write does.
-+	 */
-+
-+	/* find lower page (returns a locked page) */
-+	hidden_page = grab_cache_page(hidden_inode->i_mapping, page->index);
-+	if (!hidden_page)
-+		goto out;
-+
-+	/* get page address, and encode it */
-+	kaddr = (char *) kmap(page);
-+	hidden_kaddr = (char*) kmap(hidden_page);
-+	mini_fo_encode_block(kaddr, hidden_kaddr, PAGE_CACHE_SIZE, inode, inode->i_sb, page->index);
-+	/* if encode_block could fail, then return error */
-+	kunmap(page);
-+	kunmap(hidden_page);
-+
-+	/* call lower writepage (expects locked page) */
-+	err = hidden_inode->i_mapping->a_ops->writepage(hidden_page);
-+
-+	/*
-+	 * update mtime and ctime of lower level file system
-+	 * mini_fo' mtime and ctime are updated by generic_file_write
-+	 */
-+	hidden_inode->i_mtime = hidden_inode->i_ctime = CURRENT_TIME;
-+
-+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,1)
-+	UnlockPage(hidden_page);	/* b/c grab_cache_page locked it */
-+# endif /* kernel older than 2.4.1 */
-+	page_cache_release(hidden_page); /* b/c grab_cache_page increased refcnt */
-+
-+	if (err)
-+		ClearPageUptodate(page);
-+	else
-+		SetPageUptodate(page);
-+ out:
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,1)
-+	UnlockPage(page);
-+# endif /* kernel 2.4.1 and newer */
-+	print_exit_status(err);
-+	return err;
-+}
-+
-+
-+/*
-+ * get one page from cache or lower f/s, return error otherwise.
-+ * returns unlocked, up-to-date page (if ok), with increased refcnt.
-+ */
-+page_t *
-+mini_fo_get1page(file_t *file, int index)
-+{
-+	page_t *page;
-+	dentry_t *dentry;
-+	inode_t *inode;
-+	struct address_space *mapping;
-+	int err;
-+
-+	print_entry_location();
-+
-+	dentry = file->f_dentry; /* CPW: Moved below print_entry_location */
-+	inode = dentry->d_inode;
-+	mapping = inode->i_mapping;
-+
-+	fist_dprint(8, "%s: read page index %d pid %d\n", __FUNCTION__, index, current->pid);
-+	if (index < 0) {
-+		printk("%s BUG: index=%d\n", __FUNCTION__, index);
-+		page = ERR_PTR(-EIO);
-+		goto out;
-+	}
-+	page = read_cache_page(mapping,
-+			       index,
-+			       (filler_t *) mapping->a_ops->readpage,
-+			       (void *) file);
-+	if (IS_ERR(page))
-+		goto out;
-+	wait_on_page(page);
-+	if (!Page_Uptodate(page)) {
-+		lock_page(page);
-+		err = mapping->a_ops->readpage(file, page);
-+		if (err) {
-+			page = ERR_PTR(err);
-+			goto out;
-+		}
-+		wait_on_page(page);
-+		if (!Page_Uptodate(page)) {
-+			page = ERR_PTR(-EIO);
-+			goto out;
-+		}
-+	}
-+
-+ out:
-+	print_exit_pointer(page);
-+	return page;
-+}
-+
-+
-+/*
-+ * get one page from cache or lower f/s, return error otherwise.
-+ * similar to get1page, but doesn't guarantee that it will return
-+ * an unlocked page.
-+ */
-+page_t *
-+mini_fo_get1page_cached(file_t *file, int index)
-+{
-+	page_t *page;
-+	dentry_t *dentry;
-+	inode_t *inode;
-+	struct address_space *mapping;
-+	int err;
-+
-+	print_entry_location();
-+
-+	dentry = file->f_dentry; /* CPW: Moved below print_entry_location */
-+	inode = dentry->d_inode;
-+	mapping = inode->i_mapping;
-+
-+	fist_dprint(8, "%s: read page index %d pid %d\n", __FUNCTION__, index, current->pid);
-+	if (index < 0) {
-+		printk("%s BUG: index=%d\n", __FUNCTION__, index);
-+		page = ERR_PTR(-EIO);
-+		goto out;
-+	}
-+	page = read_cache_page(mapping,
-+			       index,
-+			       (filler_t *) mapping->a_ops->readpage,
-+			       (void *) file);
-+	if (IS_ERR(page))
-+		goto out;
-+
-+ out:
-+	print_exit_pointer(page);
-+	return page;
-+}
-+
-+
-+/*
-+ * readpage is called from generic_page_read and the fault handler.
-+ * If your file system uses generic_page_read for the read op, it
-+ * must implement readpage.
-+ *
-+ * Readpage expects a locked page, and must unlock it.
-+ */
-+STATIC int
-+mini_fo_do_readpage(file_t *file, page_t *page)
-+{
-+	int err = -EIO;
-+	dentry_t *dentry;
-+	file_t *hidden_file = NULL;
-+	dentry_t *hidden_dentry;
-+	inode_t *inode;
-+	inode_t *hidden_inode;
-+	char *page_data;
-+	page_t *hidden_page;
-+	char *hidden_page_data;
-+	int real_size;
-+
-+	print_entry_location();
-+
-+	dentry = file->f_dentry; /* CPW: Moved below print_entry_location */
-+	if (ftopd(file) != NULL)
-+		hidden_file = ftohf(file);
-+	hidden_dentry = dtohd(dentry);
-+	inode = dentry->d_inode;
-+	hidden_inode = itohi(inode);
-+
-+	fist_dprint(7, "%s: requesting page %d from file %s\n", __FUNCTION__, page->index, dentry->d_name.name);
-+
-+	MALLOC_PAGE_POINTERS(hidden_pages, num_hidden_pages);
-+	MALLOC_PAGEDATA_POINTERS(hidden_pages_data, num_hidden_pages);
-+	FOR_EACH_PAGE
-+		CURRENT_HIDDEN_PAGE = NULL;
-+
-+	/* find lower page (returns a locked page) */
-+	FOR_EACH_PAGE {
-+		fist_dprint(8, "%s: Current page index = %d\n", __FUNCTION__, CURRENT_HIDDEN_PAGEINDEX);
-+		CURRENT_HIDDEN_PAGE = read_cache_page(hidden_inode->i_mapping,
-+						      CURRENT_HIDDEN_PAGEINDEX,
-+						      (filler_t *) hidden_inode->i_mapping->a_ops->readpage,
-+						      (void *) hidden_file);
-+		if (IS_ERR(CURRENT_HIDDEN_PAGE)) {
-+			err = PTR_ERR(CURRENT_HIDDEN_PAGE);
-+			CURRENT_HIDDEN_PAGE = NULL;
-+			goto out_release;
-+		}
-+	}
-+
-+	/*
-+	 * wait for the page data to show up
-+	 * (signaled by readpage as unlocking the page)
-+	 */
-+	FOR_EACH_PAGE {
-+		wait_on_page(CURRENT_HIDDEN_PAGE);
-+		if (!Page_Uptodate(CURRENT_HIDDEN_PAGE)) {
-+			/*
-+			 * call readpage() again if we returned from wait_on_page with a
-+			 * page that's not up-to-date; that can happen when a partial
-+			 * page has a few buffers which are ok, but not the whole
-+			 * page.
-+			 */
-+			lock_page(CURRENT_HIDDEN_PAGE);
-+			err = hidden_inode->i_mapping->a_ops->readpage(hidden_file,
-+								       CURRENT_HIDDEN_PAGE);
-+			if (err) {
-+				CURRENT_HIDDEN_PAGE = NULL;
-+				goto out_release;
-+			}
-+			wait_on_page(CURRENT_HIDDEN_PAGE);
-+			if (!Page_Uptodate(CURRENT_HIDDEN_PAGE)) {
-+				err = -EIO;
-+				goto out_release;
-+			}
-+		}
-+	}
-+
-+	/* map pages, get their addresses */
-+	page_data = (char *) kmap(page);
-+	FOR_EACH_PAGE
-+		CURRENT_HIDDEN_PAGEDATA = (char *) kmap(CURRENT_HIDDEN_PAGE);
-+
-+	/* if decode_block could fail, then return error */
-+	err = 0;
-+	real_size = hidden_inode->i_size - (page->index << PAGE_CACHE_SHIFT);
-+	if (real_size <= 0)
-+		memset(page_data, 0, PAGE_CACHE_SIZE);
-+	else if (real_size < PAGE_CACHE_SIZE) {
-+		mini_fo_decode_block(hidden_page_data, page_data, real_size, inode, inode->i_sb, page->index);
-+		memset(page_data + real_size, 0, PAGE_CACHE_SIZE - real_size);
-+	} else
-+		mini_fo_decode_block(hidden_page_data, page_data, PAGE_CACHE_SIZE, inode, inode->i_sb, page->index);
-+
-+	FOR_EACH_PAGE
-+		kunmap(CURRENT_HIDDEN_PAGE);
-+	kunmap(page);
-+
-+ out_release:
-+	FOR_EACH_PAGE
-+		if (CURRENT_HIDDEN_PAGE)
-+			page_cache_release(CURRENT_HIDDEN_PAGE); /* undo read_cache_page */
-+
-+	FREE_PAGE_POINTERS(hidden_pages, num_hidden_pages);
-+	FREE_PAGEDATA_POINTERS(hidden_pages_data, num_hidden_pages);
-+
-+ out:
-+	if (err == 0)
-+		SetPageUptodate(page);
-+	else
-+		ClearPageUptodate(page);
-+
-+	print_exit_status(err);
-+	return err;
-+}
-+
-+
-+STATIC int
-+mini_fo_readpage(file_t *file, page_t *page)
-+{
-+	int err;
-+	print_entry_location();
-+
-+	err = mini_fo_do_readpage(file, page);
-+
-+	/*
-+	 * we have to unlock our page, b/c we _might_ have gotten a locked page.
-+	 * but we no longer have to wakeup on our page here, b/c UnlockPage does
-+	 * it
-+	 */
-+	UnlockPage(page);
-+
-+	print_exit_status(err);
-+	return err;
-+}
-+
-+
-+STATIC int
-+mini_fo_prepare_write(file_t *file, page_t *page, unsigned from, unsigned to)
-+{
-+	int err = 0;
-+
-+	print_entry_location();
-+
-+	/*
-+	 * we call kmap(page) only here, and do the kunmap
-+	 * and the actual downcalls, including unlockpage and uncache
-+	 * in commit_write.
-+	 */
-+	kmap(page);
-+
-+	/* fast path for whole page writes */
-+	if (from == 0 && to == PAGE_CACHE_SIZE)
-+		goto out;
-+	/* read the page to "revalidate" our data */
-+	/* call the helper function which doesn't unlock the page */
-+	if (!Page_Uptodate(page))
-+		err = mini_fo_do_readpage(file, page);
-+
-+ out:
-+	print_exit_status(err);
-+	return err;
-+}
-+
-+
-+
-+STATIC int
-+mini_fo_commit_write(file_t *file, page_t *page, unsigned from, unsigned to)
-+{
-+	int err = -ENOMEM;
-+	inode_t *inode;
-+	inode_t *hidden_inode;
-+	page_t *hidden_page;
-+	file_t *hidden_file = NULL;
-+	loff_t pos;
-+	unsigned bytes = to - from;
-+	unsigned hidden_from, hidden_to, hidden_bytes;
-+
-+	print_entry_location();
-+
-+	inode = page->mapping->host; /* CPW: Moved below print_entry_location */
-+	hidden_inode = itohi(inode);
-+
-+	ASSERT(file != NULL);
-+	/*
-+	 * here we have a kmapped page, with data from the user copied
-+	 * into it.  we need to encode_block it, and then call the lower
-+	 * commit_write.  We also need to simulate same behavior of
-+	 * generic_file_write, and call prepare_write on the lower f/s first.
-+	 */
-+#ifdef FIST_COUNT_WRITES
-+	count_writes++;
-+# endif /* FIST_COUNT_WRITES */
-+
-+	/* this is append and/or extend -- we can't have holes so fill them in */
-+	if (page->index > (hidden_inode->i_size >> PAGE_CACHE_SHIFT)) {
-+		page_t *tmp_page;
-+		int index;
-+		for (index = hidden_inode->i_size >> PAGE_CACHE_SHIFT; index < page->index; index++) {
-+			tmp_page = mini_fo_get1page(file, index);
-+			if (IS_ERR(tmp_page)) {
-+				err = PTR_ERR(tmp_page);
-+				goto out;
-+			}
-+			/* zero out the contents of the page at the appropriate offsets */
-+			memset((char*)page_address(tmp_page) + (inode->i_size & ~PAGE_CACHE_MASK), 0, PAGE_CACHE_SIZE - (inode->i_size & ~PAGE_CACHE_MASK));
-+			if (!(err = mini_fo_prepare_write(file, tmp_page, 0, PAGE_CACHE_SIZE)))
-+				err = mini_fo_commit_write(file, tmp_page, 0, PAGE_CACHE_SIZE);
-+			page_cache_release(tmp_page);
-+			if (err < 0)
-+				goto out;
-+			if (current->need_resched)
-+				schedule();
-+		}
-+	}
-+
-+	if (ftopd(file) != NULL)
-+		hidden_file = ftohf(file);
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+	mutex_lock(&hidden_inode->i_mutex);
-+#else
-+	down(&hidden_inode->i_sem);
-+#endif
-+	/* find lower page (returns a locked page) */
-+	hidden_page = grab_cache_page(hidden_inode->i_mapping, page->index);
-+	if (!hidden_page)
-+		goto out;
-+
-+#if FIST_ENCODING_BLOCKSIZE > 1
-+#  error encoding_blocksize greater than 1 is not yet supported
-+# endif /* FIST_ENCODING_BLOCKSIZE > 1 */
-+
-+	hidden_from = from & (~(FIST_ENCODING_BLOCKSIZE - 1));
-+	hidden_to = ((to + FIST_ENCODING_BLOCKSIZE - 1) & (~(FIST_ENCODING_BLOCKSIZE - 1)));
-+	if ((page->index << PAGE_CACHE_SHIFT) + to > hidden_inode->i_size) {
-+
-+		/*
-+		 * if this call to commit_write had introduced holes and the code
-+		 * for handling holes was invoked, then the beginning of this page
-+		 * must be zeroed out
-+		 * zero out bytes from 'size_of_file%pagesize' to 'from'.
-+		 */
-+		if ((hidden_from - (inode->i_size & ~PAGE_CACHE_MASK)) > 0)
-+			memset((char*)page_address(page) + (inode->i_size & ~PAGE_CACHE_MASK), 0, hidden_from - (inode->i_size & ~PAGE_CACHE_MASK));
-+
-+	}
-+	hidden_bytes = hidden_to - hidden_from;
-+
-+	/* call lower prepare_write */
-+	err = -EINVAL;
-+	if (hidden_inode->i_mapping &&
-+	    hidden_inode->i_mapping->a_ops &&
-+	    hidden_inode->i_mapping->a_ops->prepare_write)
-+		err = hidden_inode->i_mapping->a_ops->prepare_write(hidden_file,
-+								    hidden_page,
-+								    hidden_from,
-+								    hidden_to);
-+	if (err)
-+		/* don't leave locked pages behind, esp. on an ENOSPC */
-+		goto out_unlock;
-+
-+	fist_dprint(8, "%s: encoding %d bytes\n", __FUNCTION__, hidden_bytes);
-+	mini_fo_encode_block((char *) page_address(page) + hidden_from, (char*) page_address(hidden_page) + hidden_from, hidden_bytes, inode, inode->i_sb, page->index);
-+	/* if encode_block could fail, then goto unlock and return error */
-+
-+	/* call lower commit_write */
-+	err = hidden_inode->i_mapping->a_ops->commit_write(hidden_file,
-+							   hidden_page,
-+							   hidden_from,
-+							   hidden_to);
-+
-+	if (err < 0)
-+		goto out_unlock;
-+
-+	err = bytes;	/* convert error to no. of bytes */
-+
-+	inode->i_blocks = hidden_inode->i_blocks;
-+	/* we may have to update i_size */
-+	pos = (page->index << PAGE_CACHE_SHIFT) + to;
-+	if (pos > inode->i_size)
-+		inode->i_size = pos;
-+
-+	/*
-+	 * update mtime and ctime of lower level file system
-+	 * mini_fo' mtime and ctime are updated by generic_file_write
-+	 */
-+	hidden_inode->i_mtime = hidden_inode->i_ctime = CURRENT_TIME;
-+
-+	mark_inode_dirty_sync(inode);
-+
-+ out_unlock:
-+	UnlockPage(hidden_page);
-+	page_cache_release(hidden_page);
-+	kunmap(page);		/* kmap was done in prepare_write */
-+ out:
-+	/* we must set our page as up-to-date */
-+	if (err < 0)
-+		ClearPageUptodate(page);
-+	else
-+		SetPageUptodate(page);
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+	mutex_unlock(&hidden_inode->i_mutex);
-+#else
-+	up(&hidden_inode->i_sem);
-+#endif
-+	print_exit_status(err);
-+	return err;			/* assume all is ok */
-+}
-+
-+
-+STATIC int
-+mini_fo_bmap(struct address_space *mapping, long block)
-+{
-+	int err = 0;
-+	inode_t *inode;
-+	inode_t *hidden_inode;
-+
-+	print_entry_location();
-+
-+	inode = (inode_t *) mapping->host;
-+	hidden_inode = itohi(inode);
-+
-+	if (hidden_inode->i_mapping->a_ops->bmap)
-+		err = hidden_inode->i_mapping->a_ops->bmap(hidden_inode->i_mapping, block);
-+	print_exit_location();
-+	return err;
-+}
-+
-+
-+/*
-+ * This function is copied verbatim from mm/filemap.c.
-+ * XXX: It should be simply moved to some header file instead -- bug Al about it!
-+ */
-+static inline int sync_page(struct page *page)
-+{
-+	struct address_space *mapping = page->mapping;
-+
-+	if (mapping && mapping->a_ops && mapping->a_ops->sync_page)
-+		return mapping->a_ops->sync_page(page);
-+	return 0;
-+}
-+
-+
-+/*
-+ * XXX: we may not need this function if not FIST_FILTER_DATA.
-+ * FIXME: for FIST_FILTER_SCA, get all lower pages and sync them each.
-+ */
-+STATIC int
-+mini_fo_sync_page(page_t *page)
-+{
-+	int err = 0;
-+	inode_t *inode;
-+	inode_t *hidden_inode;
-+	page_t *hidden_page;
-+
-+	print_entry_location();
-+
-+	inode = page->mapping->host; /* CPW: Moved below print_entry_location */
-+	hidden_inode = itohi(inode);
-+
-+	/* find lower page (returns a locked page) */
-+	hidden_page = grab_cache_page(hidden_inode->i_mapping, page->index);
-+	if (!hidden_page)
-+		goto out;
-+
-+	err = sync_page(hidden_page);
-+
-+	UnlockPage(hidden_page);	/* b/c grab_cache_page locked it */
-+	page_cache_release(hidden_page); /* b/c grab_cache_page increased refcnt */
-+
-+ out:
-+	print_exit_status(err);
-+	return err;
-+}
---- /dev/null
-+++ b/fs/mini_fo/README
-@@ -0,0 +1,163 @@
-+README for the mini_fo overlay file system
-+=========================================
-+
-+
-+WHAT IS MINI_FO?
-+----------------
-+
-+mini_fo is a virtual kernel file system that can make read-only
-+file systems writable. This is done by redirecting modifying operations
-+to a writeable location called "storage directory", and leaving the
-+original data in the "base directory" untouched. When reading, the
-+file system merges the modifed and original data so that only the
-+newest versions will appear. This occurs transparently to the user,
-+who can access the data like on any other read-write file system.
-+
-+Base and storage directories may be located on the same or on
-+different partitions and may be of different file system types. While
-+the storage directory obviously needs to be writable, the base may or
-+may not be writable, what doesn't matter as it will no be modified
-+anyway.
-+
-+
-+WHAT IS GOOD FOR?
-+-----------------
-+
-+The primary purpose of the mini_fo file system is to allow easy
-+software updates to embedded systems, that often store their root
-+file system in a read-only flash file system, but there are many
-+more as for example sandboxing, or for allowing live-cds to
-+permanently store information.
-+
-+
-+BUILDING
-+--------
-+This should be simple. Adjust the Makefile to point to the correct
-+kernel headers you want to build the module for. Then:
-+
-+    # make
-+
-+should build "mini_fo.o" for a 2.4 kernel or "mini_fo.ko" for a 2.6
-+kernel.
-+
-+If you are building the module for you current kernel, you can install
-+the module (as root):
-+
-+    # make install
-+
-+or uninstall with
-+
-+    # make uninstall
-+
-+
-+USING THE FILE SYSTEM
-+--------------------
-+
-+the general mount syntax is:
-+
-+   mount -t mini_fo -o base=<base directory>,sto=<storage directory>\
-+                            <base directory> <mount point>
-+
-+Example:
-+
-+You have mounted a cdrom to /mnt/cdrom and want to modifiy some files
-+on it:
-+
-+load the module (as root)
-+
-+    # insmod mini_fo.o for a 2.4 kernel or
-+
-+    # insmod mini_fo.ko for a 2.6 kernel
-+
-+
-+create a storage dir in tmp and a mountpoint for mini_fo:
-+
-+    # mkdir /tmp/sto
-+    # mkdir /mnt/mini_fo
-+
-+and mount the mini_fo file system:
-+
-+    # mount -t mini_fo -o base=/mnt/cdrom,sto=/tmp/sto /mnt/cdrom /mnt/mini_fo
-+
-+
-+Now the data stored on the cd can be accessed via the mini_fo
-+mountpoint just like any read-write file system, files can be modified
-+and deleted, new ones can be created and so on. When done unmount the
-+file system:
-+
-+    # unmount /mnt/mini_fo
-+
-+Note that if the file system is mounted again using the same storage
-+file system, of course it will appear in the modified state again. If
-+you remount it using an new empty storage directory, it will be
-+unmodified. Therefore by executing:
-+
-+    # cd /tmp/sto
-+    # rm -rf *
-+
-+you can nuke all the changes you made to the original file system. But
-+ remember NEVER do this while the mini_fo file system is mounted!
-+
-+
-+Alternatively you can use the mini_fo-overlay bash script, that
-+simplifies managing mini_fo mounts. See TOOLS Section.
-+
-+
-+TOOLS
-+-----
-+
-+mini_fo-merge (experimental):
-+
-+This is a bash script that will merge changes contained in the storage
-+directory back to the base directory. This allows mini_fo to function
-+as a cache file system by overlaying a slow (network, ...) file system
-+and using a fast (ramdisk, ...) as storage. When done, changes can be
-+merged back to the (slow) base with mini_fo-merge. See "mini_fo-merge
-+-h" for details.
-+
-+It can be usefull for merging changes back after a successfull test
-+(patches, software updates...)
-+
-+
-+mini_fo-overlay:
-+
-+This bash script simplifies managing one or more mini_fo mounts. For
-+overlaying a directory called "basedir1", you can just call:
-+
-+    # mini_fo-overlay basedir1
-+
-+This will mount mini_fo with "basedir1" as base, "/tmp/sto-basedir1/"
-+as storage to "/mnt/mini_fo-basedir1/". It has more options though,
-+type "mini_fo-overlay -h" for details.
-+
-+
-+DOCUMENTATION, REPORTING BUGS, GETTING HELP
-+-------------------------------------------
-+
-+Please visit the mini_fo project page at:
-+
-+http://www.denx.de/twiki/bin/view/Know/MiniFOHome
-+
-+
-+WARNINGS
-+--------
-+
-+Never modify the base or the storage directorys while the mini_fo
-+file system is mounted, or you might crash you system. Simply accessing
-+and reading should not cause any trouble.
-+
-+Exporting a mini_fo mount point via NFS has not been tested, and may
-+or may not work.
-+
-+Check the RELEASE_NOTES for details on bugs and features.
-+
-+
-+
-+Copyright (C) 2004, 2005 Markus Klotzbuecher <mk@creamnet.de>
-+
-+This program is free software; you can redistribute it and/or
-+modify it under the terms of the GNU General Public License
-+as published by the Free Software Foundation; either version
-+2 of the License, or (at your option) any later version.
-+
-+
---- /dev/null
-+++ b/fs/mini_fo/RELEASE_NOTES
-@@ -0,0 +1,111 @@
-+Release:	mini_fo-0.6.1 (v0-6-1)
-+Date:		21.09.2005
-+
-+
-+Changes:
-+--------
-+v0-6-1:
-+
-+- bugfixes (see ChangeLog)
-+
-+- two helper scripts "mini_fo_merge" and "mini_fo_overlay" (see
-+  README for details).
-+
-+v0-6-0:
-+
-+- Support for 2.4 and 2.6 (see Makefile)
-+
-+- Partial hard link support (creating works as expected, but already
-+  existing links in the base file system will be treated as if they
-+  were individual files).
-+
-+- Various bugfixes and cleanups.
-+
-+
-+v0-6-0-pre1:
-+
-+- This is mini_fo-0-6-0-pre1! This release is a complete rewrite of
-+  many vital mini_fo parts such as the old whiteout list code which
-+  has been replaced by the new META subsystem.
-+
-+- Light weight directory renaming implemented. This means if a
-+  directory is renamed via the mini_fo filesystem this will no longer
-+  result in a complete copy in storage, instead only one empty
-+  directory will be created. All base filed contained in the original
-+  directory stay there until modified.
-+
-+- Special files (creating, renaming, deleting etc.) now working.
-+
-+- Many bugfixes and cleanup, mini_fo is now a lot more stable.
-+
-+
-+v0-5-10:
-+
-+- Final release of the 0-5-* versions. Next will be a complete rewrite
-+  of many features. This release contains several bugfixes related to
-+  directory renaming.
-+
-+
-+v0-5-10-pre6:
-+
-+- Lots of cleanup and several bugfixes related to directory deleting
-+
-+- Directory renaming suddenly works, what is most likely due to the
-+  fact tha that "mv" is smart: if the classic rename doesn't work it
-+  will assume that source and target file are on different fs and will
-+  copy the directory and try to remove the source directory. Until
-+  directory removing wasn't implemented, it would fail to do this and
-+  rollback.
-+  So, directory renaming works for now, but it doesn't yet do what you
-+  would expect from a overlay fs, so use with care.
-+
-+
-+v0-5-10-pre5:
-+
-+- implemented directory deleting
-+- made parsing of mount options more stable
-+- New format of mount options! (See README)
-+- I can't reproduce the unknown panic with 2.4.25 anymore, so I'll
-+  happily assume it never existed!
-+
-+
-+Implemented features:
-+---------------------
-+
-+- creating hard links (see BUGS on already existing hard links)
-+- lightweight directory renaming
-+- renaming device files, pipes, sockets, etc.
-+- creating, renaming, deleting of special files
-+- deleting directorys
-+- general directory reading (simple "ls" )
-+- creating files in existing directorys
-+- creating directorys
-+- renaming files.
-+- reading and writing files (involves opening)
-+- appending to files (creates copy in storage)
-+- deleting files
-+- llseek works too, what allows editors to work
-+- persistency (a deleted file stay deleted over remounts)
-+- use of symbolic links
-+- creating of device files
-+
-+
-+Not (yet) implemented features:
-+-------------------------------
-+
-+- full hard link support.
-+
-+
-+
-+BUGS:
-+-----
-+
-+Hard links in the base file system will be treated as individual
-+files, not as links to one inode.
-+
-+The main problem with hard links isn't allowing to create them, but
-+their pure existence. If you modify a base hard link, the changes made
-+will only show up on this link, the other link will remain in the
-+original state. I hope to fix this someday. Please note that this does
-+not effect the special hard links '.' and '..', that are handled
-+seperately by the lower fs.
---- /dev/null
-+++ b/fs/mini_fo/state.c
-@@ -0,0 +1,620 @@
-+/*
-+ * Copyright (C) 2005 Markus Klotzbuecher <mk@creamnet.de>
-+ *
-+ * This program is free software; you can redistribute it and/or
-+ * modify it under the terms of the GNU General Public License
-+ * as published by the Free Software Foundation; either version
-+ * 2 of the License, or (at your option) any later version.
-+ */
-+
-+#ifdef HAVE_CONFIG_H
-+# include <config.h>
-+#endif /* HAVE_CONFIG_H */
-+
-+#include "fist.h"
-+#include "mini_fo.h"
-+
-+
-+/* create the storage file, setup new states */
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+int create_sto_reg_file(dentry_t *dentry, int mode, struct nameidata *nd)
-+#else
-+int create_sto_reg_file(dentry_t *dentry, int mode)
-+#endif
-+{
-+	int err = 0;
-+	inode_t *dir;
-+	dentry_t *hidden_sto_dentry;
-+	dentry_t *hidden_sto_dir_dentry;
-+
-+	if(exists_in_storage(dentry)) {
-+		printk(KERN_CRIT "mini_fo: create_sto_file: wrong type or state.\n");
-+		err = -EINVAL;
-+		goto out;
-+	}
-+	err = get_neg_sto_dentry(dentry);
-+
-+	if (err) {
-+		printk(KERN_CRIT "mini_fo: create_sto_file: ERROR getting neg. sto dentry.\n");
-+		goto out;
-+	}
-+
-+	dir = dentry->d_parent->d_inode;
-+	hidden_sto_dentry = dtohd2(dentry);
-+
-+	/* lock parent */
-+	hidden_sto_dir_dentry = dget(hidden_sto_dentry->d_parent);
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+	mutex_lock(&hidden_sto_dir_dentry->d_inode->i_mutex);
-+#else
-+        down(&hidden_sto_dir_dentry->d_inode->i_sem);
-+#endif
-+
-+	err = PTR_ERR(hidden_sto_dir_dentry);
-+        if (IS_ERR(hidden_sto_dir_dentry))
-+                goto out;
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+	err = vfs_create(hidden_sto_dir_dentry->d_inode,
-+			 hidden_sto_dentry,
-+			 mode, nd);
-+#else
-+	err = vfs_create(hidden_sto_dir_dentry->d_inode,
-+			 hidden_sto_dentry,
-+			 mode);
-+#endif
-+        if(err) {
-+		printk(KERN_CRIT "mini_fo: create_sto_file: ERROR creating sto file.\n");
-+                goto out_lock;
-+	}
-+
-+	if(!dtohd2(dentry)->d_inode) {
-+		printk(KERN_CRIT "mini_fo: create_sto_file: ERROR creating sto file [2].\n");
-+                err = -EINVAL;
-+                goto out_lock;
-+        }
-+
-+        /* interpose the new inode */
-+        if(dtost(dentry) == DELETED) {
-+                dtost(dentry) = DEL_REWRITTEN;
-+                err = mini_fo_tri_interpose(NULL, hidden_sto_dentry, dentry, dir->i_sb, 0);
-+                if(err)
-+                        goto out_lock;
-+        }
-+        else if(dtost(dentry) == NON_EXISTANT) {
-+                dtost(dentry) = CREATED;
-+                err = mini_fo_tri_interpose(dtohd(dentry), hidden_sto_dentry, dentry, dir->i_sb, 0);
-+                if(err)
-+                        goto out_lock;
-+        }
-+        else if(dtost(dentry) == UNMODIFIED) {
-+                dtost(dentry) = MODIFIED;
-+                /* interpose on new inode */
-+                if(itohi2(dentry->d_inode) != NULL) {
-+                        printk(KERN_CRIT "mini_fo: create_sto_file: invalid inode detected.\n");
-+                        err = -EINVAL;
-+                        goto out_lock;
-+                }
-+                itohi2(dentry->d_inode) = igrab(dtohd2(dentry)->d_inode);
-+	}
-+	fist_copy_attr_timesizes(dentry->d_parent->d_inode,
-+				 hidden_sto_dir_dentry->d_inode);
-+
-+ out_lock:
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+	mutex_unlock(&hidden_sto_dir_dentry->d_inode->i_mutex);
-+#else
-+	up(&hidden_sto_dir_dentry->d_inode->i_sem);
-+#endif
-+        dput(hidden_sto_dir_dentry);
-+ out:
-+	return err;
-+}
-+
-+/* create the sto dir, setup states */
-+int create_sto_dir(dentry_t *dentry, int mode)
-+{
-+	int err = 0;
-+	inode_t *dir;
-+	dentry_t *hidden_sto_dentry;
-+        dentry_t *hidden_sto_dir_dentry;
-+
-+	/* had to take the "!S_ISDIR(mode))" check out, because it failed */
-+	if(exists_in_storage(dentry)) {
-+                printk(KERN_CRIT "mini_fo: create_sto_dir: wrong type or state.\\
-+n");
-+                err = -EINVAL;
-+                goto out;
-+        }
-+
-+	err = get_neg_sto_dentry(dentry);
-+	if(err) {
-+		err = -EINVAL;
-+		goto out;
-+	}
-+
-+	dir = dentry->d_parent->d_inode;
-+	hidden_sto_dentry = dtohd2(dentry);
-+
-+	/* was: hidden_sto_dir_dentry = lock_parent(hidden_sto_dentry); */
-+	hidden_sto_dir_dentry = dget(hidden_sto_dentry->d_parent);
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+	mutex_lock(&hidden_sto_dir_dentry->d_inode->i_mutex);
-+#else
-+	down(&hidden_sto_dir_dentry->d_inode->i_sem);
-+#endif
-+
-+	err = PTR_ERR(hidden_sto_dir_dentry);
-+	if (IS_ERR(hidden_sto_dir_dentry))
-+		goto out;
-+
-+	err = vfs_mkdir(hidden_sto_dir_dentry->d_inode,
-+			hidden_sto_dentry,
-+			mode);
-+	if(err) {
-+		printk(KERN_CRIT "mini_fo: create_sto_dir: ERROR creating sto dir.\n");
-+		goto out_lock;
-+	}
-+
-+	if(!dtohd2(dentry)->d_inode) {
-+		printk(KERN_CRIT "mini_fo: create_sto_dir: ERROR creating sto dir [2].\n");
-+		err = -EINVAL;
-+		goto out_lock;
-+	}
-+
-+	/* interpose the new inode */
-+	if(dtost(dentry) == DELETED) {
-+		dtost(dentry) = DEL_REWRITTEN;
-+		err = mini_fo_tri_interpose(NULL, hidden_sto_dentry, dentry, dir->i_sb, 0);
-+		if(err)
-+			goto out_lock;
-+	}
-+	else if(dtopd(dentry)->state == NON_EXISTANT) {
-+		dtopd(dentry)->state = CREATED;
-+		err = mini_fo_tri_interpose(dtohd(dentry), hidden_sto_dentry, dentry, dir->i_sb, 0);
-+		if(err)
-+			goto out_lock;
-+	}
-+	else if(dtopd(dentry)->state == UNMODIFIED) {
-+		dtopd(dentry)->state = MODIFIED;
-+		/* interpose on new inode */
-+		if(itohi2(dentry->d_inode) != NULL) {
-+			printk(KERN_CRIT "mini_fo:  create_sto_dir: ERROR, invalid inode detected.\n");
-+			err = -EINVAL;
-+			goto out_lock;
-+		}
-+		itohi2(dentry->d_inode) = igrab(dtohd2(dentry)->d_inode);
-+	}
-+
-+	fist_copy_attr_timesizes(dir, hidden_sto_dir_dentry->d_inode);
-+
-+	/* initalize the wol list */
-+	itopd(dentry->d_inode)->deleted_list_size = -1;
-+	itopd(dentry->d_inode)->renamed_list_size = -1;
-+	meta_build_lists(dentry);
-+
-+
-+ out_lock:
-+	/* was: unlock_dir(hidden_sto_dir_dentry); */
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+	mutex_unlock(&hidden_sto_dir_dentry->d_inode->i_mutex);
-+#else
-+	up(&hidden_sto_dir_dentry->d_inode->i_sem);
-+#endif
-+	dput(hidden_sto_dir_dentry);
-+ out:
-+	return err;
-+}
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+int create_sto_nod(dentry_t *dentry, int mode, dev_t dev)
-+#else
-+int create_sto_nod(dentry_t *dentry, int mode, int dev)
-+#endif
-+{
-+	int err = 0;
-+	inode_t *dir;
-+	dentry_t *hidden_sto_dentry;
-+	dentry_t *hidden_sto_dir_dentry;
-+
-+	if(exists_in_storage(dentry)) {
-+		err = -EEXIST;
-+		goto out;
-+	}
-+	err = get_neg_sto_dentry(dentry);
-+
-+	if (err) {
-+                printk(KERN_CRIT "mini_fo: create_sto_nod: ERROR getting neg. sto dentry.\n");
-+                goto out;
-+        }
-+
-+	dir = dentry->d_parent->d_inode;
-+	hidden_sto_dentry = dtohd2(dentry);
-+
-+	/* lock parent */
-+	hidden_sto_dir_dentry = dget(hidden_sto_dentry->d_parent);
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+	mutex_lock(&hidden_sto_dir_dentry->d_inode->i_mutex);
-+#else
-+	down(&hidden_sto_dir_dentry->d_inode->i_sem);
-+#endif
-+
-+	err = PTR_ERR(hidden_sto_dir_dentry);
-+	if (IS_ERR(hidden_sto_dir_dentry))
-+		goto out;
-+
-+	err = vfs_mknod(hidden_sto_dir_dentry->d_inode, hidden_sto_dentry, mode, dev);
-+	if(err)
-+		goto out_lock;
-+
-+	if(!dtohd2(dentry)->d_inode) {
-+		printk(KERN_CRIT "mini_fo: create_sto_nod: creating storage inode failed [1].\n");
-+		err = -EINVAL; /* return something indicating failure */
-+		goto out_lock;
-+	}
-+
-+	/* interpose the new inode */
-+	if(dtost(dentry) == DELETED) {
-+		dtost(dentry) = DEL_REWRITTEN;
-+		err = mini_fo_tri_interpose(NULL, hidden_sto_dentry, dentry, dir->i_sb, 0);
-+		if(err)
-+			goto out_lock;
-+	}
-+	else if(dtost(dentry) == NON_EXISTANT) {
-+		dtost(dentry) = CREATED;
-+		err = mini_fo_tri_interpose(dtohd(dentry), hidden_sto_dentry, dentry, dir->i_sb, 0);
-+		if(err)
-+			goto out_lock;
-+	}
-+	else if(dtost(dentry) == UNMODIFIED) {
-+		dtost(dentry) = MODIFIED;
-+		/* interpose on new inode */
-+		if(itohi2(dentry->d_inode) != NULL) {
-+			printk(KERN_CRIT "mini_fo: create_sto_nod: error, invalid inode detected.\n");
-+			err = -EINVAL;
-+			goto out_lock;
-+		}
-+		itohi2(dentry->d_inode) = igrab(dtohd2(dentry)->d_inode);
-+	}
-+
-+	fist_copy_attr_timesizes(dir, hidden_sto_dir_dentry->d_inode);
-+
-+ out_lock:
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+	mutex_unlock(&hidden_sto_dir_dentry->d_inode->i_mutex);
-+#else
-+	up(&hidden_sto_dir_dentry->d_inode->i_sem);
-+#endif
-+	dput(hidden_sto_dir_dentry);
-+ out:
-+	return err;
-+}
-+
-+
-+/* unimplemented (and possibly not usefull):
-+
-+   nondir-del_to_del_rew
-+   nondir-non_exist_to_creat
-+
-+   dir-unmod_to_del
-+   dir-mod_to_del
-+   dir-creat_to_del
-+   dir-del_rew_to_del
-+   dir-del_to_del_rew
-+   dir-non_exist_to_creat
-+*/
-+
-+
-+/* bring a file of any type from state UNMODIFIED to MODIFIED */
-+int nondir_unmod_to_mod(dentry_t *dentry, int cp_flag)
-+{
-+	int err = 0;
-+	struct vfsmount *tgt_mnt;
-+	struct vfsmount *src_mnt;
-+	dentry_t *tgt_dentry;
-+	dentry_t *src_dentry;
-+	dentry_t *hidden_sto_dentry;
-+	dentry_t *hidden_sto_dir_dentry;
-+
-+	check_mini_fo_dentry(dentry);
-+
-+	if((dtost(dentry) != UNMODIFIED) ||
-+	   S_ISDIR(dentry->d_inode->i_mode)) {
-+		printk(KERN_CRIT "mini_fo: nondir_unmod_to_mod: \
-+                                  wrong type or state.\n");
-+		err = -1;
-+		goto out;
-+	}
-+	err = get_neg_sto_dentry(dentry);
-+
-+	if (err) {
-+		printk(KERN_CRIT "mini_fo: nondir_unmod_to_mod: \
-+                                  ERROR getting neg. sto dentry.\n");
-+		goto out;
-+	}
-+
-+	/* create sto file */
-+	hidden_sto_dentry = dtohd2(dentry);
-+
-+	/* lock parent */
-+	hidden_sto_dir_dentry = dget(hidden_sto_dentry->d_parent);
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+	mutex_lock(&hidden_sto_dir_dentry->d_inode->i_mutex);
-+#else
-+        down(&hidden_sto_dir_dentry->d_inode->i_sem);
-+#endif
-+
-+	err = PTR_ERR(hidden_sto_dir_dentry);
-+        if (IS_ERR(hidden_sto_dir_dentry))
-+                goto out;
-+
-+	/* handle different types of nondirs */
-+	if(S_ISCHR(dentry->d_inode->i_mode) ||
-+	   S_ISBLK(dentry->d_inode->i_mode)) {
-+		err = vfs_mknod(hidden_sto_dir_dentry->d_inode,
-+				hidden_sto_dentry,
-+				dtohd(dentry)->d_inode->i_mode,
-+				dtohd(dentry)->d_inode->i_rdev);
-+	}
-+
-+	else if(S_ISREG(dentry->d_inode->i_mode)) {
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+		err = vfs_create(hidden_sto_dir_dentry->d_inode,
-+				 hidden_sto_dentry,
-+				 dtohd(dentry)->d_inode->i_mode, NULL);
-+#else
-+		err = vfs_create(hidden_sto_dir_dentry->d_inode,
-+				 hidden_sto_dentry,
-+				 dtohd(dentry)->d_inode->i_mode);
-+#endif
-+	}
-+        if(err) {
-+		printk(KERN_CRIT "mini_fo: nondir_unmod_to_mod: \
-+                                  ERROR creating sto file.\n");
-+                goto out_lock;
-+	}
-+
-+	/* interpose on new inode */
-+	if(itohi2(dentry->d_inode) != NULL) {
-+		printk(KERN_CRIT "mini_fo: nondir_unmod_to_mod: \
-+                                  ERROR, invalid inode detected.\n");
-+		err = -EINVAL;
-+		goto out_lock;
-+	}
-+
-+	itohi2(dentry->d_inode) = igrab(dtohd2(dentry)->d_inode);
-+
-+        fist_copy_attr_timesizes(dentry->d_parent->d_inode,
-+				 hidden_sto_dir_dentry->d_inode);
-+	dtost(dentry) = MODIFIED;
-+
-+	/* copy contents if regular file and cp_flag = 1 */
-+	if((cp_flag == 1) && S_ISREG(dentry->d_inode->i_mode)) {
-+
-+		/* unlock first */
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+		mutex_unlock(&hidden_sto_dir_dentry->d_inode->i_mutex);
-+#else
-+		up(&hidden_sto_dir_dentry->d_inode->i_sem);
-+#endif
-+
-+		dput(hidden_sto_dir_dentry);
-+
-+		tgt_dentry = dtohd2(dentry);
-+		tgt_mnt = stopd(dentry->d_inode->i_sb)->hidden_mnt2;
-+		src_dentry = dtohd(dentry);
-+		src_mnt = stopd(dentry->d_inode->i_sb)->hidden_mnt;
-+
-+		err = mini_fo_cp_cont(tgt_dentry, tgt_mnt,
-+				      src_dentry, src_mnt);
-+		if(err) {
-+			printk(KERN_CRIT "mini_fo: nondir_unmod_to_mod: \
-+                                          ERROR copying contents.\n");
-+		}
-+		goto out;
-+	}
-+
-+ out_lock:
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+	mutex_unlock(&hidden_sto_dir_dentry->d_inode->i_mutex);
-+#else
-+	up(&hidden_sto_dir_dentry->d_inode->i_sem);
-+#endif
-+        dput(hidden_sto_dir_dentry);
-+ out:
-+	return err;
-+}
-+
-+/* this function is currently identical to nondir_creat_to_del */
-+int nondir_del_rew_to_del(dentry_t *dentry)
-+{
-+	return nondir_creat_to_del(dentry);
-+}
-+
-+int nondir_creat_to_del(dentry_t *dentry)
-+{
-+	int err = 0;
-+
-+	inode_t *hidden_sto_dir_inode;
-+	dentry_t *hidden_sto_dir_dentry;
-+	dentry_t *hidden_sto_dentry;
-+
-+	check_mini_fo_dentry(dentry);
-+
-+	/* for now this function serves for both state DEL_REWRITTEN and
-+	 * CREATED */
-+	if(!(dtost(dentry) == CREATED || (dtost(dentry) == DEL_REWRITTEN)) ||
-+	   S_ISDIR(dentry->d_inode->i_mode)) {
-+		printk(KERN_CRIT "mini_fo: nondir_mod_to_del/del_rew_to_del: \
-+                                  wrong type or state.\n");
-+		err = -1;
-+		goto out;
-+	}
-+
-+	hidden_sto_dir_inode = itohi2(dentry->d_parent->d_inode);
-+	hidden_sto_dentry = dtohd2(dentry);
-+
-+	/* was: hidden_sto_dir_dentry = lock_parent(hidden_sto_dentry);*/
-+	hidden_sto_dir_dentry = dget(hidden_sto_dentry->d_parent);
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+	mutex_lock(&hidden_sto_dir_dentry->d_inode->i_mutex);
-+#else
-+	down(&hidden_sto_dir_dentry->d_inode->i_sem);
-+#endif
-+
-+	/* avoid destroying the hidden inode if the file is in use */
-+	dget(hidden_sto_dentry);
-+	err = vfs_unlink(hidden_sto_dir_inode, hidden_sto_dentry);
-+	dput(hidden_sto_dentry);
-+	if(!err)
-+		d_delete(hidden_sto_dentry);
-+
-+	/* propagate number of hard-links */
-+	dentry->d_inode->i_nlink = itohi2(dentry->d_inode)->i_nlink;
-+
-+	dtost(dentry) = NON_EXISTANT;
-+
-+	/* was: unlock_dir(hidden_sto_dir_dentry); */
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+	mutex_unlock(&hidden_sto_dir_dentry->d_inode->i_mutex);
-+#else
-+	up(&hidden_sto_dir_dentry->d_inode->i_sem);
-+#endif
-+	dput(hidden_sto_dir_dentry);
-+
-+ out:
-+	return err;
-+}
-+
-+int nondir_mod_to_del(dentry_t *dentry)
-+{
-+	int err;
-+	dentry_t *hidden_sto_dentry;
-+	inode_t *hidden_sto_dir_inode;
-+	dentry_t *hidden_sto_dir_dentry;
-+
-+	check_mini_fo_dentry(dentry);
-+
-+	if(dtost(dentry) != MODIFIED ||
-+	   S_ISDIR(dentry->d_inode->i_mode)) {
-+		printk(KERN_CRIT "mini_fo: nondir_mod_to_del: \
-+                                  wrong type or state.\n");
-+		err = -1;
-+		goto out;
-+	}
-+
-+	hidden_sto_dir_inode = itohi2(dentry->d_parent->d_inode);
-+	hidden_sto_dentry = dtohd2(dentry);
-+
-+	/* was hidden_sto_dir_dentry = lock_parent(hidden_sto_dentry); */
-+	hidden_sto_dir_dentry = dget(hidden_sto_dentry->d_parent);
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+	mutex_lock(&hidden_sto_dir_dentry->d_inode->i_mutex);
-+#else
-+	down(&hidden_sto_dir_dentry->d_inode->i_sem);
-+#endif
-+
-+	/* avoid destroying the hidden inode if the file is in use */
-+	dget(hidden_sto_dentry);
-+	err = vfs_unlink(hidden_sto_dir_inode, hidden_sto_dentry);
-+	dput(hidden_sto_dentry);
-+	if(!err)
-+		d_delete(hidden_sto_dentry);
-+
-+	/* propagate number of hard-links */
-+	dentry->d_inode->i_nlink = itohi2(dentry->d_inode)->i_nlink;
-+
-+	/* dput base dentry, this will relase the inode and free the
-+	 * dentry, as we will never need it again. */
-+	dput(dtohd(dentry));
-+	dtohd(dentry) = NULL;
-+	dtost(dentry) = DELETED;
-+
-+	/* add deleted file to META-file */
-+	meta_add_d_entry(dentry->d_parent,
-+			 dentry->d_name.name,
-+			 dentry->d_name.len);
-+
-+	/* was: unlock_dir(hidden_sto_dir_dentry); */
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-+	mutex_unlock(&hidden_sto_dir_dentry->d_inode->i_mutex);
-+#else
-+	up(&hidden_sto_dir_dentry->d_inode->i_sem);
-+#endif
-+	dput(hidden_sto_dir_dentry);
-+
-+ out:
-+	return err;
-+}
-+
-+int nondir_unmod_to_del(dentry_t *dentry)
-+{
-+	int err = 0;
-+
-+	check_mini_fo_dentry(dentry);
-+
-+	if(dtost(dentry) != UNMODIFIED ||
-+	   S_ISDIR(dentry->d_inode->i_mode)) {
-+		printk(KERN_CRIT "mini_fo: nondir_unmod_to_del: \
-+                                  wrong type or state.\n");
-+		err = -1;
-+		goto out;
-+	}
-+
-+	 /* next we have to get a negative dentry for the storage file */
-+	err = get_neg_sto_dentry(dentry);
-+
-+	if(err)
-+		goto out;
-+
-+	/* add deleted file to META lists */
-+	err = meta_add_d_entry(dentry->d_parent,
-+			       dentry->d_name.name,
-+			       dentry->d_name.len);
-+
-+	if(err)
-+		goto out;
-+
-+	/* dput base dentry, this will relase the inode and free the
-+	 * dentry, as we will never need it again. */
-+	dput(dtohd(dentry));
-+	dtohd(dentry) = NULL;
-+	dtost(dentry) = DELETED;
-+
-+ out:
-+	return err;
-+}
-+
-+/* bring a dir from state UNMODIFIED to MODIFIED */
-+int dir_unmod_to_mod(dentry_t *dentry)
-+{
-+	int err;
-+
-+	check_mini_fo_dentry(dentry);
-+
-+	if(dtost(dentry) != UNMODIFIED ||
-+	   !S_ISDIR(dentry->d_inode->i_mode)) {
-+		printk(KERN_CRIT "mini_fo: dir_unmod_to_mod: \
-+                                  wrong type or state.\n");
-+		err = -1;
-+		goto out;
-+	}
-+
-+	/* this creates our dir incl. sto. structure */
-+	err = build_sto_structure(dentry->d_parent, dentry);
-+	if(err) {
-+		printk(KERN_CRIT "mini_fo: dir_unmod_to_mod: \
-+                                  build_sto_structure failed.\n");
-+		goto out;
-+	}
-+ out:
-+	return err;
-+}
-+
---- /dev/null
-+++ b/fs/mini_fo/super.c
-@@ -0,0 +1,285 @@
-+/*
-+ * Copyright (c) 1997-2003 Erez Zadok
-+ * Copyright (c) 2001-2003 Stony Brook University
-+ *
-+ * For specific licensing information, see the COPYING file distributed with
-+ * this package, or get one from ftp://ftp.filesystems.org/pub/fist/COPYING.
-+ *
-+ * This Copyright notice must be kept intact and distributed with all
-+ * fistgen sources INCLUDING sources generated by fistgen.
-+ */
-+/*
-+ * Copyright (C) 2004, 2005 Markus Klotzbuecher <mk@creamnet.de>
-+ *
-+ * This program is free software; you can redistribute it and/or
-+ * modify it under the terms of the GNU General Public License
-+ * as published by the Free Software Foundation; either version
-+ * 2 of the License, or (at your option) any later version.
-+ */
-+
-+/*
-+ *  $Id$
-+ */
-+
-+#ifdef HAVE_CONFIG_H
-+# include <config.h>
-+#endif
-+
-+#include "fist.h"
-+#include "mini_fo.h"
-+
-+
-+STATIC void
-+mini_fo_read_inode(inode_t *inode)
-+{
-+	static struct address_space_operations mini_fo_empty_aops;
-+
-+	__itopd(inode) = kmalloc(sizeof(struct mini_fo_inode_info), GFP_KERNEL);
-+	if (!itopd(inode)) {
-+		printk("<0>%s:%s:%d: No kernel memory!\n", __FILE__, __FUNCTION__, __LINE__);
-+		ASSERT(NULL);
-+	}
-+	itohi(inode) = NULL;
-+	itohi2(inode) = NULL;
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+	inode->i_version++;
-+#else
-+	inode->i_version = ++event;	/* increment inode version */
-+#endif
-+	inode->i_op = &mini_fo_main_iops;
-+	inode->i_fop = &mini_fo_main_fops;
-+#if 0
-+	/*
-+	 * XXX: To export a file system via NFS, it has to have the
-+	 * FS_REQUIRES_DEV flag, so turn it on.  But should we inherit it from
-+	 * the lower file system, or can we allow our file system to be exported
-+	 * even if the lower one cannot be natively exported.
-+	 */
-+	inode->i_sb->s_type->fs_flags |= FS_REQUIRES_DEV;
-+	/*
-+	 * OK, the above was a hack, which is now turned off because it may
-+	 * cause a panic/oops on some systems.  The correct way to export a
-+	 * "nodev" filesystem is via using nfs-utils > 1.0 and the "fsid=" export
-+	 * parameter, which requires 2.4.20 or later.
-+	 */
-+#endif
-+	/* I don't think ->a_ops is ever allowed to be NULL */
-+	inode->i_mapping->a_ops = &mini_fo_empty_aops;
-+}
-+
-+
-+#if defined(FIST_DEBUG) || defined(FIST_FILTER_SCA)
-+/*
-+ * No need to call write_inode() on the lower inode, as it
-+ * will have been marked 'dirty' anyway. But we might need
-+ * to write some of our own stuff to disk.
-+ */
-+STATIC void
-+mini_fo_write_inode(inode_t *inode, int sync)
-+{
-+	print_entry_location();
-+	print_exit_location();
-+}
-+#endif /* defined(FIST_DEBUG) || defined(FIST_FILTER_SCA) */
-+
-+
-+STATIC void
-+mini_fo_put_inode(inode_t *inode)
-+{
-+	/*
-+	 * This is really funky stuff:
-+	 * Basically, if i_count == 1, iput will then decrement it and this inode will be destroyed.
-+	 * It is currently holding a reference to the hidden inode.
-+	 * Therefore, it needs to release that reference by calling iput on the hidden inode.
-+	 * iput() _will_ do it for us (by calling our clear_inode), but _only_ if i_nlink == 0.
-+	 * The problem is, NFS keeps i_nlink == 1 for silly_rename'd files.
-+	 * So we must for our i_nlink to 0 here to trick iput() into calling our clear_inode.
-+	 */
-+	if (atomic_read(&inode->i_count) == 1)
-+		inode->i_nlink = 0;
-+}
-+
-+
-+#if defined(FIST_DEBUG) || defined(FIST_FILTER_SCA)
-+/*
-+ * we now define delete_inode, because there are two VFS paths that may
-+ * destroy an inode: one of them calls clear inode before doing everything
-+ * else that's needed, and the other is fine.  This way we truncate the inode
-+ * size (and its pages) and then clear our own inode, which will do an iput
-+ * on our and the lower inode.
-+ */
-+STATIC void
-+mini_fo_delete_inode(inode_t *inode)
-+{
-+	print_entry_location();
-+
-+	fist_checkinode(inode, "mini_fo_delete_inode IN");
-+	inode->i_size = 0;		/* every f/s seems to do that */
-+	clear_inode(inode);
-+
-+	print_exit_location();
-+}
-+#endif /* defined(FIST_DEBUG) || defined(FIST_FILTER_SCA) */
-+
-+
-+/* final actions when unmounting a file system */
-+STATIC void
-+mini_fo_put_super(super_block_t *sb)
-+{
-+	if (stopd(sb)) {
-+		mntput(stopd(sb)->hidden_mnt);
-+		mntput(stopd(sb)->hidden_mnt2);
-+
-+		/* mk: no! dput(stopd(sb)->base_dir_dentry);
-+		   dput(stopd(sb)->storage_dir_dentry); */
-+
-+		kfree(stopd(sb));
-+		__stopd(sb) = NULL;
-+	}
-+}
-+
-+
-+#ifdef NOT_NEEDED
-+/*
-+ * This is called in do_umount before put_super.
-+ * The superblock lock is not held yet.
-+ * We probably do not need to define this or call write_super
-+ * on the hidden_sb, because sync_supers() will get to hidden_sb
-+ * sooner or later.  But it is also called from file_fsync()...
-+ */
-+STATIC void
-+mini_fo_write_super(super_block_t *sb)
-+{
-+	return;
-+}
-+#endif /* NOT_NEEDED */
-+
-+
-+STATIC int
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
-+mini_fo_statfs(struct dentry *d, struct kstatfs *buf)
-+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+mini_fo_statfs(super_block_t *sb, struct kstatfs *buf)
-+#else
-+mini_fo_statfs(super_block_t *sb, struct statfs *buf)
-+#endif
-+{
-+	int err = 0;
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
-+	struct dentry *hidden_d;
-+
-+	hidden_d = dtohd(d);
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
-+	err = statfs_by_dentry(hidden_d, buf);
-+#else
-+	err = vfs_statfs(hidden_d, buf);
-+#endif
-+#else
-+	super_block_t *hidden_sb;
-+
-+	hidden_sb = stohs(sb);
-+	err = vfs_statfs(hidden_sb, buf);
-+#endif
-+
-+	return err;
-+}
-+
-+
-+/*
-+ * XXX: not implemented.  This is not allowed yet.
-+ * Should we call this on the hidden_sb?  Probably not.
-+ */
-+STATIC int
-+mini_fo_remount_fs(super_block_t *sb, int *flags, char *data)
-+{
-+	//printk(KERN_CRIT "mini_fo_remount_fs: WARNING, this function is umimplemented.\n");
-+	return -ENOSYS;
-+}
-+
-+
-+/*
-+ * Called by iput() when the inode reference count reached zero
-+ * and the inode is not hashed anywhere.  Used to clear anything
-+ * that needs to be, before the inode is completely destroyed and put
-+ * on the inode free list.
-+ */
-+STATIC void
-+mini_fo_clear_inode(inode_t *inode)
-+{
-+	/*
-+	 * Decrement a reference to a hidden_inode, which was incremented
-+	 * by our read_inode when it was created initially.
-+	 */
-+
-+	/* release the wol_list */
-+	if(S_ISDIR(inode->i_mode)) {
-+		__meta_put_lists(inode);
-+	}
-+
-+	/* mk: fan out fun */
-+	if(itohi(inode))
-+		iput(itohi(inode));
-+	if(itohi2(inode))
-+		iput(itohi2(inode));
-+
-+	// XXX: why this assertion fails?
-+	// because it doesn't like us
-+	// ASSERT((inode->i_state & I_DIRTY) == 0);
-+	kfree(itopd(inode));
-+	__itopd(inode) = NULL;
-+}
-+
-+
-+/*
-+ * Called in do_umount() if the MNT_FORCE flag was used and this
-+ * function is defined.  See comment in linux/fs/super.c:do_umount().
-+ * Used only in nfs, to kill any pending RPC tasks, so that subsequent
-+ * code can actually succeed and won't leave tasks that need handling.
-+ *
-+ * PS. I wonder if this is somehow useful to undo damage that was
-+ * left in the kernel after a user level file server (such as amd)
-+ * dies.
-+ */
-+STATIC void
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
-+mini_fo_umount_begin(struct vfsmount *mnt, int flags)
-+{
-+	struct vfsmount *hidden_mnt;
-+
-+	hidden_mnt = stopd(mnt->mnt_sb)->hidden_mnt;
-+
-+	if (hidden_mnt->mnt_sb->s_op->umount_begin)
-+		hidden_mnt->mnt_sb->s_op->umount_begin(hidden_mnt, flags);
-+
-+}
-+#else
-+mini_fo_umount_begin(super_block_t *sb)
-+{
-+	super_block_t *hidden_sb;
-+
-+	hidden_sb = stohs(sb);
-+
-+	if (hidden_sb->s_op->umount_begin)
-+		hidden_sb->s_op->umount_begin(hidden_sb);
-+
-+}
-+#endif
-+
-+
-+struct super_operations mini_fo_sops =
-+{
-+	read_inode:		mini_fo_read_inode,
-+#if defined(FIST_DEBUG) || defined(FIST_FILTER_SCA)
-+	write_inode:	mini_fo_write_inode,
-+#endif /* defined(FIST_DEBUG) || defined(FIST_FILTER_SCA) */
-+	put_inode:		mini_fo_put_inode,
-+#if defined(FIST_DEBUG) || defined(FIST_FILTER_SCA)
-+	delete_inode:	mini_fo_delete_inode,
-+#endif /* defined(FIST_DEBUG) || defined(FIST_FILTER_SCA) */
-+	put_super:		mini_fo_put_super,
-+	statfs:		mini_fo_statfs,
-+	remount_fs:		mini_fo_remount_fs,
-+	clear_inode:	mini_fo_clear_inode,
-+	umount_begin:	mini_fo_umount_begin,
-+};
---- /dev/null
-+++ b/fs/mini_fo/Kconfig
-@@ -0,0 +1,3 @@
-+config MINI_FO
-+	tristate "Mini fanout overlay filesystem"
-+
diff --git a/target/linux/generic/patches-2.6.37/209-overlayfs.patch b/target/linux/generic/patches-2.6.37/209-overlayfs.patch
new file mode 100644
index 0000000000..386f99ef4e
--- /dev/null
+++ b/target/linux/generic/patches-2.6.37/209-overlayfs.patch
@@ -0,0 +1,2787 @@
+--- a/fs/open.c
++++ b/fs/open.c
+@@ -651,19 +651,19 @@ static inline int __get_file_write_acces
+ 	return error;
+ }
+ 
+-static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
+-					struct file *f,
++static struct file *__dentry_open(struct path *path, struct file *f,
+ 					int (*open)(struct inode *, struct file *),
+ 					const struct cred *cred)
+ {
+ 	struct inode *inode;
+ 	int error;
+ 
++	path_get(path);
+ 	f->f_mode = OPEN_FMODE(f->f_flags) | FMODE_LSEEK |
+ 				FMODE_PREAD | FMODE_PWRITE;
+-	inode = dentry->d_inode;
++	inode = path->dentry->d_inode;
+ 	if (f->f_mode & FMODE_WRITE) {
+-		error = __get_file_write_access(inode, mnt);
++		error = __get_file_write_access(inode, path->mnt);
+ 		if (error)
+ 			goto cleanup_file;
+ 		if (!special_file(inode->i_mode))
+@@ -671,8 +671,7 @@ static struct file *__dentry_open(struct
+ 	}
+ 
+ 	f->f_mapping = inode->i_mapping;
+-	f->f_path.dentry = dentry;
+-	f->f_path.mnt = mnt;
++	f->f_path = *path;
+ 	f->f_pos = 0;
+ 	f->f_op = fops_get(inode->i_fop);
+ 	file_sb_list_add(f, inode->i_sb);
+@@ -718,7 +717,7 @@ cleanup_all:
+ 			 * here, so just reset the state.
+ 			 */
+ 			file_reset_write(f);
+-			mnt_drop_write(mnt);
++			mnt_drop_write(path->mnt);
+ 		}
+ 	}
+ 	file_sb_list_del(f);
+@@ -726,8 +725,7 @@ cleanup_all:
+ 	f->f_path.mnt = NULL;
+ cleanup_file:
+ 	put_filp(f);
+-	dput(dentry);
+-	mntput(mnt);
++	path_put(path);
+ 	return ERR_PTR(error);
+ }
+ 
+@@ -753,14 +751,14 @@ cleanup_file:
+ struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
+ 		int (*open)(struct inode *, struct file *))
+ {
++	struct path path = { .dentry = dentry, .mnt = nd->path.mnt };
+ 	const struct cred *cred = current_cred();
+ 
+ 	if (IS_ERR(nd->intent.open.file))
+ 		goto out;
+ 	if (IS_ERR(dentry))
+ 		goto out_err;
+-	nd->intent.open.file = __dentry_open(dget(dentry), mntget(nd->path.mnt),
+-					     nd->intent.open.file,
++	nd->intent.open.file = __dentry_open(&path, nd->intent.open.file,
+ 					     open, cred);
+ out:
+ 	return nd->intent.open.file;
+@@ -787,10 +785,17 @@ struct file *nameidata_to_filp(struct na
+ 	filp = nd->intent.open.file;
+ 	/* Has the filesystem initialised the file for us? */
+ 	if (filp->f_path.dentry == NULL) {
+-		path_get(&nd->path);
+-		filp = __dentry_open(nd->path.dentry, nd->path.mnt, filp,
+-				     NULL, cred);
++		struct inode *inode = nd->path.dentry->d_inode;
++
++		if (inode->i_op->open) {
++			int flags = filp->f_flags;
++			put_filp(filp);
++			filp = inode->i_op->open(nd->path.dentry, flags, cred);
++		} else {
++			filp = __dentry_open(&nd->path, filp, NULL, cred);
++		}
+ 	}
++
+ 	return filp;
+ }
+ 
+@@ -801,35 +806,45 @@ struct file *nameidata_to_filp(struct na
+ struct file *dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags,
+ 			 const struct cred *cred)
+ {
+-	int error;
++	struct path path = { .dentry = dentry, .mnt = mnt };
++	struct file *ret;
++
++	BUG_ON(!mnt);
++
++	ret = vfs_open(&path, flags, cred);
++	path_put(&path);
++
++	return ret;
++}
++EXPORT_SYMBOL(dentry_open);
++
++/**
++ * vfs_open - open the file at the given path
++ * @path: path to open
++ * @flags: open flags
++ * @cred: credentials to use
++ *
++ * Open the file.  If successful, the returned file will have acquired
++ * an additional reference for path.
++ */
++struct file *vfs_open(struct path *path, int flags, const struct cred *cred)
++{
+ 	struct file *f;
++	struct inode *inode = path->dentry->d_inode;
+ 
+ 	validate_creds(cred);
+ 
+-	/*
+-	 * We must always pass in a valid mount pointer.   Historically
+-	 * callers got away with not passing it, but we must enforce this at
+-	 * the earliest possible point now to avoid strange problems deep in the
+-	 * filesystem stack.
+-	 */
+-	if (!mnt) {
+-		printk(KERN_WARNING "%s called with NULL vfsmount\n", __func__);
+-		dump_stack();
+-		return ERR_PTR(-EINVAL);
+-	}
++	if (inode->i_op->open)
++		return inode->i_op->open(path->dentry, flags, cred);
+ 
+-	error = -ENFILE;
+ 	f = get_empty_filp();
+-	if (f == NULL) {
+-		dput(dentry);
+-		mntput(mnt);
+-		return ERR_PTR(error);
+-	}
++	if (f == NULL)
++		return ERR_PTR(-ENFILE);
+ 
+ 	f->f_flags = flags;
+-	return __dentry_open(dentry, mnt, f, NULL, cred);
++	return __dentry_open(path, f, NULL, cred);
+ }
+-EXPORT_SYMBOL(dentry_open);
++EXPORT_SYMBOL(vfs_open);
+ 
+ static void __put_unused_fd(struct files_struct *files, unsigned int fd)
+ {
+--- a/include/linux/fs.h
++++ b/include/linux/fs.h
+@@ -1574,6 +1574,7 @@ struct inode_operations {
+ 			  loff_t len);
+ 	int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start,
+ 		      u64 len);
++	struct file *(*open)(struct dentry *, int flags, const struct cred *);
+ };
+ 
+ struct seq_file;
+@@ -1975,6 +1976,7 @@ extern int do_fallocate(struct file *fil
+ extern long do_sys_open(int dfd, const char __user *filename, int flags,
+ 			int mode);
+ extern struct file *filp_open(const char *, int, int);
++extern struct file *vfs_open(struct path *, int flags, const struct cred *);
+ extern struct file * dentry_open(struct dentry *, struct vfsmount *, int,
+ 				 const struct cred *);
+ extern int filp_close(struct file *, fl_owner_t id);
+--- a/fs/splice.c
++++ b/fs/splice.c
+@@ -1307,6 +1307,7 @@ long do_splice_direct(struct file *in, l
+ 
+ 	return ret;
+ }
++EXPORT_SYMBOL(do_splice_direct);
+ 
+ static int splice_pipe_to_pipe(struct pipe_inode_info *ipipe,
+ 			       struct pipe_inode_info *opipe,
+--- a/fs/namespace.c
++++ b/fs/namespace.c
+@@ -1307,6 +1307,23 @@ void drop_collected_mounts(struct vfsmou
+ 	release_mounts(&umount_list);
+ }
+ 
++struct vfsmount *clone_private_mount(struct path *path)
++{
++	struct vfsmount *mnt;
++
++	if (IS_MNT_UNBINDABLE(path->mnt))
++		return ERR_PTR(-EINVAL);
++
++	down_read(&namespace_sem);
++	mnt = clone_mnt(path->mnt, path->dentry, CL_PRIVATE);
++	up_read(&namespace_sem);
++	if (!mnt)
++		return ERR_PTR(-ENOMEM);
++
++	return mnt;
++}
++EXPORT_SYMBOL_GPL(clone_private_mount);
++
+ int iterate_mounts(int (*f)(struct vfsmount *, void *), void *arg,
+ 		   struct vfsmount *root)
+ {
+--- a/include/linux/mount.h
++++ b/include/linux/mount.h
+@@ -121,6 +121,9 @@ static inline void mntput(struct vfsmoun
+ 	}
+ }
+ 
++struct path;
++extern struct vfsmount *clone_private_mount(struct path *path);
++
+ extern struct vfsmount *do_kern_mount(const char *fstype, int flags,
+ 				      const char *name, void *data);
+ 
+--- a/fs/Kconfig
++++ b/fs/Kconfig
+@@ -64,6 +64,7 @@ source "fs/quota/Kconfig"
+ 
+ source "fs/autofs4/Kconfig"
+ source "fs/fuse/Kconfig"
++source "fs/overlayfs/Kconfig"
+ 
+ config CUSE
+ 	tristate "Character device in Userspace support"
+--- a/fs/Makefile
++++ b/fs/Makefile
+@@ -103,6 +103,7 @@ obj-$(CONFIG_QNX4FS_FS)		+= qnx4/
+ obj-$(CONFIG_AUTOFS4_FS)	+= autofs4/
+ obj-$(CONFIG_ADFS_FS)		+= adfs/
+ obj-$(CONFIG_FUSE_FS)		+= fuse/
++obj-$(CONFIG_OVERLAYFS_FS)	+= overlayfs/
+ obj-$(CONFIG_UDF_FS)		+= udf/
+ obj-$(CONFIG_SUN_OPENPROMFS)	+= openpromfs/
+ obj-$(CONFIG_OMFS_FS)		+= omfs/
+--- /dev/null
++++ b/fs/overlayfs/Kconfig
+@@ -0,0 +1,4 @@
++config OVERLAYFS_FS
++	tristate "Overlay filesystem support"
++	help
++	  Add support for overlay filesystem.
+--- /dev/null
++++ b/fs/overlayfs/Makefile
+@@ -0,0 +1,5 @@
++#
++# Makefile for the overlay filesystem.
++#
++
++obj-$(CONFIG_OVERLAYFS_FS) += overlayfs.o
+--- /dev/null
++++ b/fs/overlayfs/overlayfs.c
+@@ -0,0 +1,2358 @@
++#include <linux/fs.h>
++#include <linux/namei.h>
++#include <linux/sched.h>
++#include <linux/fs_struct.h>
++#include <linux/file.h>
++#include <linux/xattr.h>
++#include <linux/security.h>
++#include <linux/device_cgroup.h>
++#include <linux/mount.h>
++#include <linux/splice.h>
++#include <linux/slab.h>
++#include <linux/parser.h>
++#include <linux/module.h>
++#include <linux/uaccess.h>
++#include <linux/rbtree.h>
++
++MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>");
++MODULE_DESCRIPTION("Overlay filesystem");
++MODULE_LICENSE("GPL");
++
++#define OVL_COPY_UP_CHUNK_SIZE (1 << 20)
++
++struct ovl_fs {
++	struct vfsmount *upper_mnt;
++	struct vfsmount *lower_mnt;
++};
++
++struct ovl_entry {
++	struct dentry *__upperdentry;
++	struct dentry *lowerdentry;
++	union {
++		struct {
++			u64 version;
++			bool opaque;
++		};
++		struct rcu_head rcu;
++	};
++};
++
++static const char *ovl_whiteout_xattr = "trusted.overlay.whiteout";
++static const char *ovl_opaque_xattr = "trusted.overlay.opaque";
++static const char *ovl_whiteout_symlink = "(overlay-whiteout)";
++
++enum ovl_path_type {
++	OVL_PATH_UPPER,
++	OVL_PATH_MERGE,
++	OVL_PATH_LOWER,
++};
++
++static enum ovl_path_type ovl_path_type(struct dentry *dentry)
++{
++	struct ovl_entry *oe = dentry->d_fsdata;
++
++	if (oe->__upperdentry) {
++		if (oe->lowerdentry && S_ISDIR(dentry->d_inode->i_mode))
++			return OVL_PATH_MERGE;
++		else
++			return OVL_PATH_UPPER;
++	} else {
++		return OVL_PATH_LOWER;
++	}
++}
++
++static struct dentry *ovl_upperdentry_dereference(struct ovl_entry *oe)
++{
++	struct dentry *upperdentry = ACCESS_ONCE(oe->__upperdentry);
++	smp_read_barrier_depends();
++	return upperdentry;
++}
++
++static void ovl_path_upper(struct dentry *dentry, struct path *path)
++{
++	struct ovl_fs *ofs = dentry->d_sb->s_fs_info;
++	struct ovl_entry *oe = dentry->d_fsdata;
++
++	path->mnt = ofs->upper_mnt;
++	path->dentry = ovl_upperdentry_dereference(oe);
++}
++
++static void ovl_path_lower(struct dentry *dentry, struct path *path)
++{
++	struct ovl_fs *ofs = dentry->d_sb->s_fs_info;
++	struct ovl_entry *oe = dentry->d_fsdata;
++
++	path->mnt = ofs->lower_mnt;
++	path->dentry = oe->lowerdentry;
++}
++
++static enum ovl_path_type ovl_path_real(struct dentry *dentry,
++					struct path *path)
++{
++
++	enum ovl_path_type type = ovl_path_type(dentry);
++
++	if (type == OVL_PATH_LOWER)
++		ovl_path_lower(dentry, path);
++	else
++		ovl_path_upper(dentry, path);
++
++	return type;
++}
++
++static struct dentry *ovl_dentry_upper(struct dentry *dentry)
++{
++	struct ovl_entry *oe = dentry->d_fsdata;
++
++	return ovl_upperdentry_dereference(oe);
++}
++
++static struct dentry *ovl_dentry_lower(struct dentry *dentry)
++{
++	struct ovl_entry *oe = dentry->d_fsdata;
++
++	return oe->lowerdentry;
++}
++
++static struct dentry *ovl_dentry_real(struct dentry *dentry)
++{
++	struct ovl_entry *oe = dentry->d_fsdata;
++	struct dentry *realdentry;
++
++	realdentry = ovl_upperdentry_dereference(oe);
++	if (!realdentry)
++		realdentry = oe->lowerdentry;
++
++	return realdentry;
++}
++
++static bool ovl_dentry_is_opaque(struct dentry *dentry)
++{
++	struct ovl_entry *oe = dentry->d_fsdata;
++	return oe->opaque;
++}
++
++static void ovl_dentry_set_opaque(struct dentry *dentry, bool opaque)
++{
++	struct ovl_entry *oe = dentry->d_fsdata;
++	oe->opaque = opaque;
++}
++
++static void ovl_dentry_update(struct dentry *dentry, struct dentry *upperdentry)
++{
++	struct ovl_entry *oe = dentry->d_fsdata;
++
++	WARN_ON(!mutex_is_locked(&upperdentry->d_parent->d_inode->i_mutex));
++	WARN_ON(oe->__upperdentry);
++	smp_wmb();
++	oe->__upperdentry = upperdentry;
++}
++
++static void ovl_dentry_version_inc(struct dentry *dentry)
++{
++	struct ovl_entry *oe = dentry->d_fsdata;
++
++	WARN_ON(!mutex_is_locked(&dentry->d_inode->i_mutex));
++	oe->version++;
++}
++
++static u64 ovl_dentry_version_get(struct dentry *dentry)
++{
++	struct ovl_entry *oe = dentry->d_fsdata;
++
++	WARN_ON(!mutex_is_locked(&dentry->d_inode->i_mutex));
++	return oe->version;
++}
++
++static bool ovl_is_whiteout(struct dentry *dentry)
++{
++	int res;
++	char val;
++
++	if (!dentry)
++		return false;
++	if (!dentry->d_inode)
++		return false;
++	if (!S_ISLNK(dentry->d_inode->i_mode))
++		return false;
++
++	res = vfs_getxattr(dentry, ovl_whiteout_xattr, &val, 1);
++	if (res == 1 && val == 'y')
++		return true;
++
++	return false;
++}
++
++static bool ovl_is_opaquedir(struct dentry *dentry)
++{
++	int res;
++	char val;
++
++	if (!S_ISDIR(dentry->d_inode->i_mode))
++		return false;
++
++	res = vfs_getxattr(dentry, ovl_opaque_xattr, &val, 1);
++	if (res == 1 && val == 'y')
++		return true;
++
++	return false;
++}
++
++struct ovl_cache_entry {
++	const char *name;
++	unsigned int len;
++	unsigned int type;
++	u64 ino;
++	bool is_whiteout;
++	struct list_head l_node;
++	struct rb_node node;
++};
++
++struct ovl_readdir_data {
++	struct rb_root *root;
++	struct list_head *list;
++	struct list_head *middle;
++	struct dentry *dir;
++	int count;
++	int err;
++};
++
++struct ovl_dir_file {
++	bool is_real;
++	bool is_cached;
++	struct list_head cursor;
++	u64 cache_version;
++	struct list_head cache;
++	struct file *realfile;
++};
++
++static struct ovl_cache_entry *ovl_cache_entry_from_node(struct rb_node *n)
++{
++	return container_of(n, struct ovl_cache_entry, node);
++}
++
++static struct ovl_cache_entry *ovl_cache_entry_find(struct rb_root *root,
++						    const char *name, int len)
++{
++	struct rb_node *node = root->rb_node;
++	int cmp;
++
++	while (node) {
++		struct ovl_cache_entry *p = ovl_cache_entry_from_node(node);
++
++		cmp = strncmp(name, p->name, len);
++		if (cmp > 0)
++			node = p->node.rb_right;
++		else if (cmp < 0 || len < p->len)
++			node = p->node.rb_left;
++		else
++			return p;
++	}
++
++	return NULL;
++}
++
++static struct ovl_cache_entry *ovl_cache_entry_new(const char *name, int len,
++						   u64 ino, unsigned int d_type,
++						   bool is_whiteout)
++{
++	struct ovl_cache_entry *p;
++
++	p = kmalloc(sizeof(*p) + len + 1, GFP_KERNEL);
++	if (p) {
++		char *name_copy = (char *) (p + 1);
++		memcpy(name_copy, name, len);
++		name_copy[len] = '\0';
++		p->name = name_copy;
++		p->len = len;
++		p->type = d_type;
++		p->ino = ino;
++		p->is_whiteout = is_whiteout;
++	}
++
++	return p;
++}
++
++static int ovl_cache_entry_add_rb(struct ovl_readdir_data *rdd,
++				  const char *name, int len, u64 ino,
++				  unsigned int d_type, bool is_whiteout)
++{
++	struct rb_node **newp = &rdd->root->rb_node;
++	struct rb_node *parent = NULL;
++	struct ovl_cache_entry *p;
++
++	while (*newp) {
++		int cmp;
++		struct ovl_cache_entry *tmp;
++
++		parent = *newp;
++		tmp = ovl_cache_entry_from_node(*newp);
++		cmp = strncmp(name, tmp->name, len);
++		if (cmp > 0)
++			newp = &tmp->node.rb_right;
++		else if (cmp < 0 || len < tmp->len)
++			newp = &tmp->node.rb_left;
++		else
++			return 0;
++	}
++
++	p = ovl_cache_entry_new(name, len, ino, d_type, is_whiteout);
++	if (p == NULL)
++		return -ENOMEM;
++
++	list_add_tail(&p->l_node, rdd->list);
++	rb_link_node(&p->node, parent, newp);
++	rb_insert_color(&p->node, rdd->root);
++
++	return 0;
++}
++
++static int ovl_fill_lower(void *buf, const char *name, int namelen,
++			    loff_t offset, u64 ino, unsigned int d_type)
++{
++	struct ovl_readdir_data *rdd = buf;
++	struct ovl_cache_entry *p;
++
++	rdd->count++;
++	p = ovl_cache_entry_find(rdd->root, name, namelen);
++	if (p) {
++		list_move_tail(&p->l_node, rdd->middle);
++	} else {
++		p = ovl_cache_entry_new(name, namelen, ino, d_type, false);
++		if (p == NULL)
++			rdd->err = -ENOMEM;
++		else
++			list_add_tail(&p->l_node, rdd->middle);
++	}
++
++	return rdd->err;
++}
++
++static void ovl_cache_free(struct list_head *list)
++{
++	struct ovl_cache_entry *p;
++	struct ovl_cache_entry *n;
++
++	list_for_each_entry_safe(p, n, list, l_node)
++		kfree(p);
++
++	INIT_LIST_HEAD(list);
++}
++
++static int ovl_fill_upper(void *buf, const char *name, int namelen,
++			  loff_t offset, u64 ino, unsigned int d_type)
++{
++	struct ovl_readdir_data *rdd = buf;
++	bool is_whiteout = false;
++
++	rdd->count++;
++	if (d_type == DT_LNK) {
++		struct dentry *dentry;
++
++		dentry = lookup_one_len(name, rdd->dir, namelen);
++		if (IS_ERR(dentry)) {
++			rdd->err = PTR_ERR(dentry);
++			goto out;
++		}
++		is_whiteout = ovl_is_whiteout(dentry);
++		dput(dentry);
++	}
++
++	rdd->err = ovl_cache_entry_add_rb(rdd, name, namelen, ino, d_type,
++					  is_whiteout);
++
++out:
++	return rdd->err;
++}
++
++static int ovl_dir_read(struct path *realpath, struct ovl_readdir_data *rdd,
++			  filldir_t filler)
++{
++	const struct cred *old_cred;
++	struct cred *override_cred;
++	struct file *realfile;
++	int err;
++
++	realfile = vfs_open(realpath, O_RDONLY | O_DIRECTORY, current_cred());
++	if (IS_ERR(realfile))
++		return PTR_ERR(realfile);
++
++	err = -ENOMEM;
++	override_cred = prepare_creds();
++	if (override_cred) {
++		/*
++		 * CAP_SYS_ADMIN for getxattr
++		 * CAP_DAC_OVERRIDE for lookup and unlink
++		 */
++		cap_raise(override_cred->cap_effective, CAP_SYS_ADMIN);
++		cap_raise(override_cred->cap_effective, CAP_DAC_OVERRIDE);
++		old_cred = override_creds(override_cred);
++
++		do {
++			rdd->count = 0;
++			rdd->err = 0;
++			err = vfs_readdir(realfile, filler, rdd);
++			if (err >= 0)
++				err = rdd->err;
++		} while (!err && rdd->count);
++
++		revert_creds(old_cred);
++		put_cred(override_cred);
++	}
++	fput(realfile);
++
++	if (err) {
++		if (rdd->list)
++			ovl_cache_free(rdd->list);
++		return err;
++	}
++
++	return 0;
++}
++
++static void ovl_dir_reset(struct file *file)
++{
++	struct ovl_dir_file *od = file->private_data;
++	enum ovl_path_type type = ovl_path_type(file->f_path.dentry);
++
++	if (ovl_dentry_version_get(file->f_path.dentry) != od->cache_version) {
++		list_del_init(&od->cursor);
++		ovl_cache_free(&od->cache);
++		od->is_cached = false;
++	}
++	WARN_ON(!od->is_real && type != OVL_PATH_MERGE);
++	if (od->is_real && type == OVL_PATH_MERGE) {
++		fput(od->realfile);
++		od->realfile = NULL;
++		od->is_real = false;
++	}
++}
++
++static int ovl_dir_read_merged(struct path *upperpath, struct path *lowerpath,
++			       struct ovl_readdir_data *rdd)
++{
++	int err;
++	struct rb_root root = RB_ROOT;
++	struct list_head middle;
++
++	rdd->root = &root;
++	if (upperpath->dentry) {
++		rdd->dir = upperpath->dentry;
++		err = ovl_dir_read(upperpath, rdd, ovl_fill_upper);
++		if (err)
++			goto out;
++	}
++	/*
++	 * Insert lowerpath entries before upperpath ones, this allows
++	 * offsets to be reasonably constant
++	 */
++	list_add(&middle, rdd->list);
++	rdd->middle = &middle;
++	err = ovl_dir_read(lowerpath, rdd, ovl_fill_lower);
++	list_del(&middle);
++out:
++	rdd->root = NULL;
++
++	return err;
++}
++
++static void ovl_seek_cursor(struct ovl_dir_file *od, loff_t pos)
++{
++	struct list_head *l;
++	loff_t off;
++
++	l = od->cache.next;
++	for (off = 0; off < pos; off++) {
++		if (l == &od->cache)
++			break;
++		l = l->next;
++	}
++	list_move_tail(&od->cursor, l);
++}
++
++static int ovl_readdir(struct file *file, void *buf, filldir_t filler)
++{
++	struct ovl_dir_file *od = file->private_data;
++	int res;
++
++	if (!file->f_pos)
++		ovl_dir_reset(file);
++
++	if (od->is_real) {
++		res = vfs_readdir(od->realfile, filler, buf);
++		file->f_pos = od->realfile->f_pos;
++
++		return res;
++	}
++
++	if (!od->is_cached) {
++		struct path lowerpath;
++		struct path upperpath;
++		struct ovl_readdir_data rdd = { .list = &od->cache };
++
++		ovl_path_lower(file->f_path.dentry, &lowerpath);
++		ovl_path_upper(file->f_path.dentry, &upperpath);
++
++		res = ovl_dir_read_merged(&upperpath, &lowerpath, &rdd);
++		if (res)
++			return res;
++
++		od->cache_version = ovl_dentry_version_get(file->f_path.dentry);
++		od->is_cached = true;
++
++		ovl_seek_cursor(od, file->f_pos);
++	}
++
++	while (od->cursor.next != &od->cache) {
++		int over;
++		loff_t off;
++		struct ovl_cache_entry *p;
++
++		p = list_entry(od->cursor.next, struct ovl_cache_entry, l_node);
++		off = file->f_pos;
++		file->f_pos++;
++		list_move(&od->cursor, &p->l_node);
++
++		if (p->is_whiteout)
++			continue;
++
++		over = filler(buf, p->name, p->len, off, p->ino, p->type);
++		if (over)
++			break;
++	}
++
++	return 0;
++}
++
++static loff_t ovl_dir_llseek(struct file *file, loff_t offset, int origin)
++{
++	loff_t res;
++	struct ovl_dir_file *od = file->private_data;
++
++	mutex_lock(&file->f_dentry->d_inode->i_mutex);
++	if (!file->f_pos)
++		ovl_dir_reset(file);
++
++	if (od->is_real) {
++		res = vfs_llseek(od->realfile, offset, origin);
++		file->f_pos = od->realfile->f_pos;
++	} else {
++		res = -EINVAL;
++
++		switch (origin) {
++		case SEEK_CUR:
++			offset += file->f_pos;
++			break;
++		case SEEK_SET:
++			break;
++		default:
++			goto out_unlock;
++		}
++		if (offset < 0)
++			goto out_unlock;
++
++		if (offset != file->f_pos) {
++			file->f_pos = offset;
++			if (od->is_cached)
++				ovl_seek_cursor(od, offset);
++		}
++		res = offset;
++	}
++out_unlock:
++	mutex_unlock(&file->f_dentry->d_inode->i_mutex);
++
++	return res;
++}
++
++static int ovl_dir_fsync(struct file *file, int datasync)
++{
++	struct ovl_dir_file *od = file->private_data;
++
++	/* May need to reopen directory if it got copied up */
++	if (!od->realfile) {
++		struct path upperpath;
++
++		ovl_path_upper(file->f_path.dentry, &upperpath);
++		od->realfile = vfs_open(&upperpath, O_RDONLY, current_cred());
++		if (IS_ERR(od->realfile))
++			return PTR_ERR(od->realfile);
++	}
++
++	return vfs_fsync(od->realfile, datasync);
++}
++
++static int ovl_dir_release(struct inode *inode, struct file *file)
++{
++	struct ovl_dir_file *od = file->private_data;
++
++	list_del(&od->cursor);
++	ovl_cache_free(&od->cache);
++	if (od->realfile)
++		fput(od->realfile);
++	kfree(od);
++
++	return 0;
++}
++
++static int ovl_dir_open(struct inode *inode, struct file *file)
++{
++	struct path realpath;
++	struct file *realfile;
++	struct ovl_dir_file *od;
++	enum ovl_path_type type;
++
++	od = kzalloc(sizeof(struct ovl_dir_file), GFP_KERNEL);
++	if (!od)
++		return -ENOMEM;
++
++	type = ovl_path_real(file->f_path.dentry, &realpath);
++	realfile = vfs_open(&realpath, file->f_flags, current_cred());
++	if (IS_ERR(realfile)) {
++		kfree(od);
++		return PTR_ERR(realfile);
++	}
++	INIT_LIST_HEAD(&od->cache);
++	INIT_LIST_HEAD(&od->cursor);
++	od->is_cached = false;
++	od->realfile = realfile;
++	od->is_real = (type != OVL_PATH_MERGE);
++	file->private_data = od;
++
++	return 0;
++}
++
++static const struct file_operations ovl_dir_operations = {
++	.read		= generic_read_dir,
++	.open		= ovl_dir_open,
++	.readdir	= ovl_readdir,
++	.llseek		= ovl_dir_llseek,
++	.fsync		= ovl_dir_fsync,
++	.release	= ovl_dir_release,
++};
++
++static const struct inode_operations ovl_dir_inode_operations;
++
++static void ovl_entry_free(struct rcu_head *head)
++{
++	struct ovl_entry *oe = container_of(head, struct ovl_entry, rcu);
++	kfree(oe);
++}
++
++static void ovl_dentry_release(struct dentry *dentry)
++{
++	struct ovl_entry *oe = dentry->d_fsdata;
++
++	if (oe) {
++		dput(oe->__upperdentry);
++		dput(oe->lowerdentry);
++		call_rcu(&oe->rcu, ovl_entry_free);
++	}
++}
++
++static const struct dentry_operations ovl_dentry_operations = {
++	.d_release = ovl_dentry_release,
++};
++
++static struct dentry *ovl_lookup_real(struct dentry *dir, struct qstr *name)
++{
++	struct dentry *dentry;
++
++	mutex_lock(&dir->d_inode->i_mutex);
++	dentry = lookup_one_len(name->name, dir, name->len);
++	mutex_unlock(&dir->d_inode->i_mutex);
++
++	if (IS_ERR(dentry)) {
++		if (PTR_ERR(dentry) == -ENOENT)
++			dentry = NULL;
++	} else if (!dentry->d_inode) {
++		dput(dentry);
++		dentry = NULL;
++	}
++	return dentry;
++}
++
++static struct ovl_entry *ovl_alloc_entry(void)
++{
++	return kzalloc(sizeof(struct ovl_entry), GFP_KERNEL);
++}
++
++static struct inode *ovl_new_inode(struct super_block *sb, umode_t mode,
++				   struct ovl_entry *oe);
++
++static struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
++				   struct nameidata *nd)
++{
++	struct ovl_entry *oe;
++	struct dentry *upperdir;
++	struct dentry *lowerdir;
++	struct dentry *upperdentry = NULL;
++	struct dentry *lowerdentry = NULL;
++	struct inode *inode = NULL;
++	int err;
++
++	err = -ENOMEM;
++	oe = ovl_alloc_entry();
++	if (!oe)
++		goto out;
++
++	upperdir = ovl_dentry_upper(dentry->d_parent);
++	lowerdir = ovl_dentry_lower(dentry->d_parent);
++
++	if (upperdir) {
++		upperdentry = ovl_lookup_real(upperdir, &dentry->d_name);
++		err = PTR_ERR(upperdentry);
++		if (IS_ERR(upperdentry))
++			goto out_put_dir;
++
++		if (lowerdir && upperdentry &&
++		    (S_ISLNK(upperdentry->d_inode->i_mode) ||
++		     S_ISDIR(upperdentry->d_inode->i_mode))) {
++			const struct cred *old_cred;
++			struct cred *override_cred;
++
++			err = -ENOMEM;
++			override_cred = prepare_creds();
++			if (!override_cred)
++				goto out_dput_upper;
++
++			/* CAP_SYS_ADMIN needed for getxattr */
++			cap_raise(override_cred->cap_effective, CAP_SYS_ADMIN);
++			old_cred = override_creds(override_cred);
++
++			if (ovl_is_opaquedir(upperdentry)) {
++				oe->opaque = true;
++			} else if (ovl_is_whiteout(upperdentry)) {
++				dput(upperdentry);
++				upperdentry = NULL;
++				oe->opaque = true;
++			}
++			revert_creds(old_cred);
++			put_cred(override_cred);
++		}
++	}
++	if (lowerdir && !oe->opaque) {
++		lowerdentry = ovl_lookup_real(lowerdir, &dentry->d_name);
++		err = PTR_ERR(lowerdentry);
++		if (IS_ERR(lowerdentry))
++			goto out_dput_upper;
++	}
++
++	if (lowerdentry && upperdentry &&
++	    (!S_ISDIR(upperdentry->d_inode->i_mode) ||
++	     !S_ISDIR(lowerdentry->d_inode->i_mode))) {
++		dput(lowerdentry);
++		lowerdentry = NULL;
++		oe->opaque = true;
++	}
++
++	if (lowerdentry || upperdentry) {
++		struct dentry *realdentry;
++
++		realdentry = upperdentry ? upperdentry : lowerdentry;
++		err = -ENOMEM;
++		inode = ovl_new_inode(dir->i_sb, realdentry->d_inode->i_mode, oe);
++		if (!inode)
++			goto out_dput;
++	}
++
++	if (upperdentry)
++		oe->__upperdentry = upperdentry;
++
++	if (lowerdentry)
++		oe->lowerdentry = lowerdentry;
++
++	dentry->d_fsdata = oe;
++	dentry->d_op = &ovl_dentry_operations;
++	d_add(dentry, inode);
++
++	return NULL;
++
++out_dput:
++	dput(lowerdentry);
++out_dput_upper:
++	dput(upperdentry);
++out_put_dir:
++	kfree(oe);
++out:
++	return ERR_PTR(err);
++}
++
++static int ovl_copy_up_xattr(struct dentry *old, struct dentry *new)
++{
++	ssize_t list_size, size;
++	char *buf, *name, *value;
++	int error;
++
++	if (!old->d_inode->i_op->getxattr ||
++	    !new->d_inode->i_op->getxattr)
++		return 0;
++
++	list_size = vfs_listxattr(old, NULL, 0);
++	if (list_size <= 0) {
++		if (list_size == -EOPNOTSUPP)
++			return 0;
++		return list_size;
++	}
++
++	buf = kzalloc(list_size, GFP_KERNEL);
++	if (!buf)
++		return -ENOMEM;
++
++	error = -ENOMEM;
++	value = kmalloc(XATTR_SIZE_MAX, GFP_KERNEL);
++	if (!value)
++		goto out;
++
++	list_size = vfs_listxattr(old, buf, list_size);
++	if (list_size <= 0) {
++		error = list_size;
++		goto out_free_value;
++	}
++
++	for (name = buf; name < (buf + list_size); name += strlen(name) + 1) {
++		size = vfs_getxattr(old, name, value, XATTR_SIZE_MAX);
++		if (size <= 0) {
++			error = size;
++			goto out_free_value;
++		}
++		error = vfs_setxattr(new, name, value, size, 0);
++		if (error)
++			goto out_free_value;
++	}
++
++out_free_value:
++	kfree(value);
++out:
++	kfree(buf);
++	return error;
++}
++
++static int ovl_copy_up_data(struct path *old, struct path *new, loff_t len)
++{
++	struct file *old_file;
++	struct file *new_file;
++	int error = 0;
++
++	if (len == 0)
++		return 0;
++
++	old_file = vfs_open(old, O_RDONLY, current_cred());
++	if (IS_ERR(old_file))
++		return PTR_ERR(old_file);
++
++	new_file = vfs_open(new, O_WRONLY, current_cred());
++	if (IS_ERR(new_file)) {
++		error = PTR_ERR(new_file);
++		goto out_fput;
++	}
++
++	/* FIXME: copy up sparse files efficiently */
++	while (len) {
++		loff_t offset = new_file->f_pos;
++		size_t this_len = OVL_COPY_UP_CHUNK_SIZE;
++		long bytes;
++
++		if (len < this_len)
++			this_len = len;
++
++		if (signal_pending_state(TASK_KILLABLE, current))
++			return -EINTR;
++
++		bytes = do_splice_direct(old_file, &offset, new_file, this_len,
++				 SPLICE_F_MOVE);
++		if (bytes <= 0) {
++			error = bytes;
++			break;
++		}
++
++		len -= bytes;
++	}
++
++	fput(new_file);
++out_fput:
++	fput(old_file);
++	return error;
++}
++
++static struct dentry *ovl_lookup_create(struct dentry *upperdir,
++					struct dentry *template)
++{
++	int err;
++	struct dentry *newdentry;
++	struct qstr *name = &template->d_name;
++
++	newdentry = lookup_one_len(name->name, upperdir, name->len);
++	if (IS_ERR(newdentry))
++		return newdentry;
++
++	if (newdentry->d_inode) {
++		const struct cred *old_cred;
++		struct cred *override_cred;
++
++		/* No need to check whiteout if lower parent is non-existent */
++		err = -EEXIST;
++		if (!ovl_dentry_lower(template->d_parent))
++			goto out_dput;
++
++		if (!S_ISLNK(newdentry->d_inode->i_mode))
++			goto out_dput;
++
++		err = -ENOMEM;
++		override_cred = prepare_creds();
++		if (!override_cred)
++			goto out_dput;
++
++		/*
++		 * CAP_SYS_ADMIN for getxattr
++		 * CAP_FOWNER for unlink in sticky directory
++		 */
++		cap_raise(override_cred->cap_effective, CAP_SYS_ADMIN);
++		cap_raise(override_cred->cap_effective, CAP_FOWNER);
++		old_cred = override_creds(override_cred);
++
++		err = -EEXIST;
++		if (ovl_is_whiteout(newdentry))
++			err = vfs_unlink(upperdir->d_inode, newdentry);
++
++		revert_creds(old_cred);
++		put_cred(override_cred);
++		if (err)
++			goto out_dput;
++
++		dput(newdentry);
++		newdentry = lookup_one_len(name->name, upperdir, name->len);
++		if (IS_ERR(newdentry))
++			return newdentry;
++
++		/*
++		 * Whiteout just been successfully removed, parent
++		 * i_mutex is still held, there's no way the lookup
++		 * could return positive.
++		 */
++		WARN_ON(newdentry->d_inode);
++	}
++
++	return newdentry;
++
++out_dput:
++	dput(newdentry);
++	return ERR_PTR(err);
++}
++
++static struct dentry *ovl_upper_create(struct dentry *upperdir,
++				       struct dentry *dentry,
++				       struct kstat *stat, const char *link)
++{
++	int err;
++	struct dentry *newdentry;
++	struct inode *dir = upperdir->d_inode;
++
++	newdentry = ovl_lookup_create(upperdir, dentry);
++	if (IS_ERR(newdentry))
++		goto out;
++
++	switch (stat->mode & S_IFMT) {
++	case S_IFREG:
++		err = vfs_create(dir, newdentry, stat->mode, NULL);
++		break;
++
++	case S_IFDIR:
++		err = vfs_mkdir(dir, newdentry, stat->mode);
++		break;
++
++	case S_IFCHR:
++	case S_IFBLK:
++	case S_IFIFO:
++	case S_IFSOCK:
++		err = vfs_mknod(dir, newdentry, stat->mode, stat->rdev);
++		break;
++
++	case S_IFLNK:
++		err = vfs_symlink(dir, newdentry, link);
++		break;
++
++	default:
++		err = -EPERM;
++	}
++	if (err) {
++		dput(newdentry);
++		newdentry = ERR_PTR(err);
++	}
++
++out:
++	return newdentry;
++
++}
++
++static char *ovl_read_symlink(struct dentry *realdentry)
++{
++	int res;
++	char *buf;
++	struct inode *inode = realdentry->d_inode;
++	mm_segment_t old_fs;
++
++	res = -EINVAL;
++	if (!inode->i_op->readlink)
++		goto err;
++
++	res = -ENOMEM;
++	buf = (char *) __get_free_page(GFP_KERNEL);
++	if (!buf)
++		goto err;
++
++	old_fs = get_fs();
++	set_fs(get_ds());
++	/* The cast to a user pointer is valid due to the set_fs() */
++	res = inode->i_op->readlink(realdentry,
++				    (char __user *)buf, PAGE_SIZE - 1);
++	set_fs(old_fs);
++	if (res < 0) {
++		free_page((unsigned long) buf);
++		goto err;
++	}
++	buf[res] = '\0';
++
++	return buf;
++
++err:
++	return ERR_PTR(res);
++}
++
++static int ovl_set_timestamps(struct dentry *upperdentry, struct kstat *stat)
++{
++	struct iattr attr = {
++		.ia_valid = ATTR_ATIME | ATTR_MTIME | ATTR_ATIME_SET | ATTR_MTIME_SET,
++		.ia_atime = stat->atime,
++		.ia_mtime = stat->mtime,
++	};
++
++	return notify_change(upperdentry, &attr);
++}
++
++static int ovl_set_mode(struct dentry *upperdentry, umode_t mode)
++{
++	struct iattr attr = {
++		.ia_valid = ATTR_MODE,
++		.ia_mode = mode,
++	};
++
++	return notify_change(upperdentry, &attr);
++}
++
++static int ovl_set_opaque(struct dentry *upperdentry)
++{
++	int err;
++	const struct cred *old_cred;
++	struct cred *override_cred;
++
++	override_cred = prepare_creds();
++	if (!override_cred)
++		return -ENOMEM;
++
++	/* CAP_SYS_ADMIN for setxattr of "trusted" namespace */
++	cap_raise(override_cred->cap_effective, CAP_SYS_ADMIN);
++	old_cred = override_creds(override_cred);
++	err = vfs_setxattr(upperdentry, ovl_opaque_xattr, "y", 1, 0);
++	revert_creds(old_cred);
++	put_cred(override_cred);
++
++	return err;
++}
++
++static int ovl_remove_opaque(struct dentry *upperdentry)
++{
++	int err;
++	const struct cred *old_cred;
++	struct cred *override_cred;
++
++	override_cred = prepare_creds();
++	if (!override_cred)
++		return -ENOMEM;
++
++	/* CAP_SYS_ADMIN for removexattr of "trusted" namespace */
++	cap_raise(override_cred->cap_effective, CAP_SYS_ADMIN);
++	old_cred = override_creds(override_cred);
++	err = vfs_removexattr(upperdentry, ovl_opaque_xattr);
++	revert_creds(old_cred);
++	put_cred(override_cred);
++
++	return err;
++}
++
++static int ovl_copy_up_locked(struct dentry *upperdir, struct dentry *dentry,
++			      struct path *lowerpath, struct kstat *stat,
++			      const char *link)
++{
++	int err;
++	struct path newpath;
++	umode_t mode = stat->mode;
++	struct ovl_fs *ofs = dentry->d_sb->s_fs_info;
++
++	/* Can't properly set mode on creation because of the umask */
++	stat->mode &= S_IFMT;
++
++	newpath.mnt = ofs->upper_mnt;
++	newpath.dentry = ovl_upper_create(upperdir, dentry, stat, link);
++	if (IS_ERR(newpath.dentry)) {
++		err = PTR_ERR(newpath.dentry);
++
++		/* Already copied up? */
++		if (err == -EEXIST && ovl_path_type(dentry) != OVL_PATH_LOWER)
++			return 0;
++
++		return err;
++	}
++
++	/* FIXME: recovery from failure to copy up */
++
++	if (S_ISREG(stat->mode)) {
++		err = ovl_copy_up_data(lowerpath, &newpath, stat->size);
++		if (err)
++			return err;
++	}
++
++	err = ovl_copy_up_xattr(lowerpath->dentry, newpath.dentry);
++	if (err)
++		return err;
++
++	mutex_lock(&newpath.dentry->d_inode->i_mutex);
++	if (!S_ISLNK(stat->mode))
++		err = ovl_set_mode(newpath.dentry, mode);
++	if (!err)
++		err = ovl_set_timestamps(newpath.dentry, stat);
++	mutex_unlock(&newpath.dentry->d_inode->i_mutex);
++	if (err)
++		return err;
++
++	ovl_dentry_update(dentry, newpath.dentry);
++
++	/*
++	 * Easiest way to get rid of the lower dentry reference is to
++	 * drop this dentry.  This is neither needed nor possible for
++	 * directories.
++	 */
++	if (!S_ISDIR(stat->mode))
++		d_drop(dentry);
++
++	return 0;
++}
++
++static int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
++			   struct path *lowerpath, struct kstat *stat)
++{
++	int err;
++	struct kstat pstat;
++	struct path parentpath;
++	struct dentry *upperdir;
++	const struct cred *old_cred;
++	struct cred *override_cred;
++	char *link = NULL;
++
++	ovl_path_upper(parent, &parentpath);
++	upperdir = parentpath.dentry;
++
++	err = vfs_getattr(parentpath.mnt, parentpath.dentry, &pstat);
++	if (err)
++		return err;
++
++	if (S_ISLNK(stat->mode)) {
++		link = ovl_read_symlink(lowerpath->dentry);
++		if (IS_ERR(link))
++			return PTR_ERR(link);
++	}
++
++	err = -ENOMEM;
++	override_cred = prepare_creds();
++	if (!override_cred)
++		goto out_free_link;
++
++	override_cred->fsuid = stat->uid;
++	override_cred->fsgid = stat->gid;
++	/*
++	 * CAP_SYS_ADMIN for copying up extended attributes
++	 * CAP_DAC_OVERRIDE for create
++	 * CAP_FOWNER for chmod, timestamp update
++	 * CAP_FSETID for chmod
++	 * CAP_MKNOD for mknod
++	 */
++	cap_raise(override_cred->cap_effective, CAP_SYS_ADMIN);
++	cap_raise(override_cred->cap_effective, CAP_DAC_OVERRIDE);
++	cap_raise(override_cred->cap_effective, CAP_FOWNER);
++	cap_raise(override_cred->cap_effective, CAP_FSETID);
++	cap_raise(override_cred->cap_effective, CAP_MKNOD);
++	old_cred = override_creds(override_cred);
++
++	mutex_lock_nested(&upperdir->d_inode->i_mutex, I_MUTEX_PARENT);
++	/*
++	 * Using upper filesystem locking to protect against copy up
++	 * racing with rename (rename means the copy up was already
++	 * successful).
++	 */
++	if (dentry->d_parent != parent) {
++		WARN_ON((ovl_path_type(dentry) == OVL_PATH_LOWER));
++		err = 0;
++	} else {
++		err = ovl_copy_up_locked(upperdir, dentry, lowerpath,
++					 stat, link);
++		if (!err) {
++			/* Restore timestamps on parent (best effort) */
++			ovl_set_timestamps(upperdir, &pstat);
++		}
++	}
++
++	mutex_unlock(&upperdir->d_inode->i_mutex);
++
++	revert_creds(old_cred);
++	put_cred(override_cred);
++
++out_free_link:
++	if (link)
++		free_page((unsigned long) link);
++
++	return err;
++}
++
++static int ovl_copy_up(struct dentry *dentry)
++{
++	int err;
++
++	err = 0;
++	while (!err) {
++		struct dentry *next;
++		struct dentry *parent;
++		struct path lowerpath;
++		struct kstat stat;
++		enum ovl_path_type type = ovl_path_type(dentry);
++
++		if (type != OVL_PATH_LOWER)
++			break;
++
++		next = dget(dentry);
++		/* find the topmost dentry not yet copied up */
++		for (;;) {
++			parent = dget_parent(next);
++
++			type = ovl_path_type(parent);
++			if (type != OVL_PATH_LOWER)
++				break;
++
++			dput(next);
++			next = parent;
++		}
++
++		ovl_path_lower(next, &lowerpath);
++		err = vfs_getattr(lowerpath.mnt, lowerpath.dentry, &stat);
++		if (!err)
++			err = ovl_copy_up_one(parent, next, &lowerpath, &stat);
++
++		dput(parent);
++		dput(next);
++	}
++
++	return err;
++}
++
++/* Optimize by not copying up the file first and truncating later */
++static int ovl_copy_up_truncate(struct dentry *dentry, loff_t size)
++{
++	int err;
++	struct kstat stat;
++	struct path lowerpath;
++	struct dentry *parent = dget_parent(dentry);
++
++	err = ovl_copy_up(parent);
++	if (err)
++		goto out_dput_parent;
++
++	ovl_path_lower(dentry, &lowerpath);
++	err = vfs_getattr(lowerpath.mnt, lowerpath.dentry, &stat);
++	if (err)
++		goto out_dput_parent;
++
++	if (size < stat.size)
++		stat.size = size;
++
++	err = ovl_copy_up_one(parent, dentry, &lowerpath, &stat);
++
++out_dput_parent:
++	dput(parent);
++	return err;
++}
++
++static int ovl_setattr(struct dentry *dentry, struct iattr *attr)
++{
++	struct dentry *upperdentry;
++	int err;
++
++	if ((attr->ia_valid & ATTR_SIZE) && !ovl_dentry_upper(dentry))
++		err = ovl_copy_up_truncate(dentry, attr->ia_size);
++	else
++		err = ovl_copy_up(dentry);
++	if (err)
++		return err;
++
++	upperdentry = ovl_dentry_upper(dentry);
++
++	if (attr->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
++		attr->ia_valid &= ~ATTR_MODE;
++
++	mutex_lock(&upperdentry->d_inode->i_mutex);
++	err = notify_change(upperdentry, attr);
++	mutex_unlock(&upperdentry->d_inode->i_mutex);
++
++	return err;
++}
++
++static int ovl_getattr(struct vfsmount *mnt, struct dentry *dentry,
++			 struct kstat *stat)
++{
++	struct path realpath;
++
++	ovl_path_real(dentry, &realpath);
++	return vfs_getattr(realpath.mnt, realpath.dentry, stat);
++}
++
++static int ovl_dir_getattr(struct vfsmount *mnt, struct dentry *dentry,
++			 struct kstat *stat)
++{
++	int err;
++	enum ovl_path_type type;
++	struct path realpath;
++
++	type = ovl_path_real(dentry, &realpath);
++	err = vfs_getattr(realpath.mnt, realpath.dentry, stat);
++	if (err)
++		return err;
++
++	stat->dev = dentry->d_sb->s_dev;
++	stat->ino = dentry->d_inode->i_ino;
++
++	/*
++	 * It's probably not worth it to count subdirs to get the
++	 * correct link count.  nlink=1 seems to pacify 'find' and
++	 * other utilities.
++	 */
++	if (type == OVL_PATH_MERGE)
++		stat->nlink = 1;
++
++	return 0;
++}
++
++static int ovl_permission(struct inode *inode, int mask, unsigned int flags)
++{
++	struct ovl_entry *oe;
++	struct dentry *alias = NULL;
++	struct inode *realinode;
++	struct dentry *realdentry;
++	bool is_upper;
++	int err;
++
++	if (S_ISDIR(inode->i_mode)) {
++		oe = inode->i_private;
++	} else if (flags & IPERM_FLAG_RCU) {
++		return -ECHILD;
++	} else {
++		/*
++		 * For non-directories find an alias and get the info
++		 * from there.
++		 */
++		spin_lock(&inode->i_lock);
++		if (WARN_ON(list_empty(&inode->i_dentry))) {
++			spin_unlock(&inode->i_lock);
++			return -ENOENT;
++		}
++		alias = list_entry(inode->i_dentry.next, struct dentry, d_alias);
++		dget(alias);
++		spin_unlock(&inode->i_lock);
++		oe = alias->d_fsdata;
++	}
++
++	realdentry = ovl_upperdentry_dereference(oe);
++	is_upper = true;
++	if (!realdentry) {
++		realdentry = oe->lowerdentry;
++		is_upper = false;
++	}
++
++	/* Careful in RCU walk mode */
++	realinode = ACCESS_ONCE(realdentry->d_inode);
++	if (!realinode) {
++		WARN_ON(!(flags & IPERM_FLAG_RCU));
++		return -ENOENT;
++	}
++
++	if (mask & MAY_WRITE) {
++		umode_t mode = realinode->i_mode;
++
++		/*
++		 * Writes will always be redirected to upper layer, so
++		 * ignore lower layer being read-only.
++		 */
++		err = -EROFS;
++		if (is_upper && IS_RDONLY(realinode) &&
++		    (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)))
++			goto out_dput;
++
++		/*
++		 * Nobody gets write access to an immutable file.
++		 */
++		err = -EACCES;
++		if (IS_IMMUTABLE(realinode))
++			goto out_dput;
++	}
++
++	if (realinode->i_op->permission)
++		err = realinode->i_op->permission(realinode, mask, flags);
++	else
++		err = generic_permission(realinode, mask, flags,
++					 realinode->i_op->check_acl);
++out_dput:
++	dput(alias);
++	return err;
++}
++
++static int ovl_create_object(struct dentry *dentry, int mode, dev_t rdev,
++			     const char *link)
++{
++	int err;
++	struct dentry *newdentry;
++	struct dentry *upperdir;
++	struct inode *inode;
++	struct kstat stat = {
++		.mode = mode,
++		.rdev = rdev,
++	};
++
++	err = -ENOMEM;
++	inode = ovl_new_inode(dentry->d_sb, mode, dentry->d_fsdata);
++	if (!inode)
++		goto out;
++
++	err = ovl_copy_up(dentry->d_parent);
++	if (err)
++		goto out_iput;
++
++	upperdir = ovl_dentry_upper(dentry->d_parent);
++	mutex_lock_nested(&upperdir->d_inode->i_mutex, I_MUTEX_PARENT);
++
++	newdentry = ovl_upper_create(upperdir, dentry, &stat, link);
++	err = PTR_ERR(newdentry);
++	if (IS_ERR(newdentry))
++		goto out_unlock;
++
++	ovl_dentry_version_inc(dentry->d_parent);
++	if (ovl_dentry_is_opaque(dentry) && S_ISDIR(mode)) {
++		err = ovl_set_opaque(newdentry);
++		if (err)
++			goto out_dput;
++	}
++	ovl_dentry_update(dentry, newdentry);
++	d_instantiate(dentry, inode);
++	inode = NULL;
++	newdentry = NULL;
++	err = 0;
++
++out_dput:
++	dput(newdentry);
++out_unlock:
++	mutex_unlock(&upperdir->d_inode->i_mutex);
++out_iput:
++	iput(inode);
++out:
++	return err;
++}
++
++static int ovl_create(struct inode *dir, struct dentry *dentry, int mode,
++			struct nameidata *nd)
++{
++	return ovl_create_object(dentry, (mode & 07777) | S_IFREG, 0, NULL);
++}
++
++static int ovl_mkdir(struct inode *dir, struct dentry *dentry, int mode)
++{
++	return ovl_create_object(dentry, (mode & 07777) | S_IFDIR, 0, NULL);
++}
++
++static int ovl_mknod(struct inode *dir, struct dentry *dentry, int mode,
++		       dev_t rdev)
++{
++	return ovl_create_object(dentry, mode, rdev, NULL);
++}
++
++static int ovl_symlink(struct inode *dir, struct dentry *dentry,
++			 const char *link)
++{
++	return ovl_create_object(dentry, S_IFLNK, 0, link);
++}
++
++struct ovl_link_data {
++	struct dentry *realdentry;
++	void *cookie;
++};
++
++static void *ovl_follow_link(struct dentry *dentry, struct nameidata *nd)
++{
++	void *ret;
++	struct dentry *realdentry;
++	struct inode *realinode;
++
++	realdentry = ovl_dentry_real(dentry);
++	realinode = realdentry->d_inode;
++
++	if (WARN_ON(!realinode->i_op->follow_link))
++		return ERR_PTR(-EPERM);
++
++	ret = realinode->i_op->follow_link(realdentry, nd);
++	if (IS_ERR(ret))
++		return ret;
++
++	if (realinode->i_op->put_link) {
++		struct ovl_link_data *data;
++
++		data = kmalloc(sizeof(struct ovl_link_data), GFP_KERNEL);
++		if (!data) {
++			realinode->i_op->put_link(realdentry, nd, ret);
++			return ERR_PTR(-ENOMEM);
++		}
++		data->realdentry = realdentry;
++		data->cookie = ret;
++
++		return data;
++	} else {
++		return NULL;
++	}
++}
++
++static void ovl_put_link(struct dentry *dentry, struct nameidata *nd, void *c)
++{
++	struct inode *realinode;
++	struct ovl_link_data *data = c;
++
++	if (!data)
++		return;
++
++	realinode = data->realdentry->d_inode;
++	realinode->i_op->put_link(data->realdentry, nd, data->cookie);
++	kfree(data);
++}
++
++static int ovl_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
++{
++	struct path realpath;
++	struct inode *realinode;
++
++	ovl_path_real(dentry, &realpath);
++	realinode = realpath.dentry->d_inode;
++
++	if (!realinode->i_op->readlink)
++		return -EINVAL;
++
++	touch_atime(realpath.mnt, realpath.dentry);
++
++	return realinode->i_op->readlink(realpath.dentry, buf, bufsiz);
++}
++
++static int ovl_whiteout(struct dentry *upperdir, struct dentry *dentry)
++{
++	int err;
++	struct dentry *newdentry;
++	const struct cred *old_cred;
++	struct cred *override_cred;
++
++	/* FIXME: recheck lower dentry to see if whiteout is really needed */
++
++	err = -ENOMEM;
++	override_cred = prepare_creds();
++	if (!override_cred)
++		goto out;
++
++	/*
++	 * CAP_SYS_ADMIN for setxattr
++	 * CAP_DAC_OVERRIDE for symlink creation
++	 */
++	cap_raise(override_cred->cap_effective, CAP_SYS_ADMIN);
++	cap_raise(override_cred->cap_effective, CAP_DAC_OVERRIDE);
++	override_cred->fsuid = 0;
++	override_cred->fsgid = 0;
++	old_cred = override_creds(override_cred);
++
++	newdentry = lookup_one_len(dentry->d_name.name, upperdir,
++				   dentry->d_name.len);
++	err = PTR_ERR(newdentry);
++	if (IS_ERR(newdentry))
++		goto out_put_cred;
++
++	/* Just been removed within the same locked region */
++	WARN_ON(newdentry->d_inode);
++
++	err = vfs_symlink(upperdir->d_inode, newdentry, ovl_whiteout_symlink);
++	if (err)
++		goto out_dput;
++
++	ovl_dentry_version_inc(dentry->d_parent);
++
++	err = vfs_setxattr(newdentry, ovl_whiteout_xattr, "y", 1, 0);
++
++out_dput:
++	dput(newdentry);
++out_put_cred:
++	revert_creds(old_cred);
++	put_cred(override_cred);
++out:
++	return err;
++}
++
++static int ovl_do_remove(struct dentry *dentry, bool is_dir)
++{
++	int err;
++	enum ovl_path_type type;
++	struct path realpath;
++	struct dentry *upperdir;
++
++	err = ovl_copy_up(dentry->d_parent);
++	if (err)
++		return err;
++
++	upperdir = ovl_dentry_upper(dentry->d_parent);
++	mutex_lock_nested(&upperdir->d_inode->i_mutex, I_MUTEX_PARENT);
++	type = ovl_path_real(dentry, &realpath);
++	if (type != OVL_PATH_LOWER) {
++		err = -ESTALE;
++		if (realpath.dentry->d_parent != upperdir)
++			goto out_d_drop;
++
++		if (is_dir)
++			err = vfs_rmdir(upperdir->d_inode, realpath.dentry);
++		else
++			err = vfs_unlink(upperdir->d_inode, realpath.dentry);
++		if (err)
++			goto out_d_drop;
++
++		ovl_dentry_version_inc(dentry->d_parent);
++	}
++
++	if (type != OVL_PATH_UPPER || ovl_dentry_is_opaque(dentry))
++		err = ovl_whiteout(upperdir, dentry);
++
++	/*
++	 * Keeping this dentry hashed would mean having to release
++	 * upperpath/lowerpath, which could only be done if we are the
++	 * sole user of this dentry.  Too tricky...  Just unhash for
++	 * now.
++	 */
++out_d_drop:
++	d_drop(dentry);
++	mutex_unlock(&upperdir->d_inode->i_mutex);
++
++	return err;
++}
++
++static int ovl_unlink(struct inode *dir, struct dentry *dentry)
++{
++	return ovl_do_remove(dentry, false);
++}
++
++static int ovl_check_empty_dir(struct dentry *dentry)
++{
++	int err;
++	struct path lowerpath;
++	struct path upperpath;
++	struct ovl_cache_entry *p;
++	LIST_HEAD(list);
++	struct ovl_readdir_data rdd = { .list = &list };
++
++	ovl_path_upper(dentry, &upperpath);
++	ovl_path_lower(dentry, &lowerpath);
++
++	err = ovl_dir_read_merged(&upperpath, &lowerpath, &rdd);
++	if (err)
++		return err;
++
++	err = 0;
++
++	list_for_each_entry(p, &list, l_node) {
++		if (p->is_whiteout)
++			continue;
++
++		if (p->name[0] == '.') {
++			if (p->len == 1)
++				continue;
++			if (p->len == 2 && p->name[1] == '.')
++				continue;
++		}
++		err = -ENOTEMPTY;
++		break;
++	}
++
++	ovl_cache_free(&list);
++
++	return err;
++}
++
++static int ovl_unlink_whiteout(void *buf, const char *name, int namelen,
++				 loff_t offset, u64 ino, unsigned int d_type)
++{
++	struct ovl_readdir_data *rdd = buf;
++
++	rdd->count++;
++	/* check d_type to filter out "." and ".." */
++	if (d_type == DT_LNK) {
++		struct dentry *dentry;
++
++		dentry = lookup_one_len(name, rdd->dir, namelen);
++		if (IS_ERR(dentry)) {
++			rdd->err = PTR_ERR(dentry);
++		} else {
++			rdd->err = vfs_unlink(rdd->dir->d_inode, dentry);
++			dput(dentry);
++		}
++	}
++
++	return rdd->err;
++}
++
++static int ovl_remove_whiteouts(struct dentry *dentry)
++{
++	struct path upperpath;
++	struct ovl_readdir_data rdd = {	.list = NULL };
++
++	ovl_path_upper(dentry, &upperpath);
++	rdd.dir = upperpath.dentry;
++
++	return ovl_dir_read(&upperpath, &rdd, ovl_unlink_whiteout);
++}
++
++static int ovl_rmdir(struct inode *dir, struct dentry *dentry)
++{
++	int err;
++	enum ovl_path_type type;
++
++	type = ovl_path_type(dentry);
++	if (type != OVL_PATH_UPPER) {
++		err = ovl_check_empty_dir(dentry);
++		if (err)
++			return err;
++
++		if (type == OVL_PATH_MERGE) {
++			err = ovl_remove_whiteouts(dentry);
++			if (err)
++				return err;
++		}
++	}
++
++	return ovl_do_remove(dentry, true);
++}
++
++static int ovl_link(struct dentry *old, struct inode *newdir,
++		    struct dentry *new)
++{
++	int err;
++	struct dentry *olddentry;
++	struct dentry *newdentry;
++	struct dentry *upperdir;
++
++	err = ovl_copy_up(old);
++	if (err)
++		goto out;
++
++	err = ovl_copy_up(new->d_parent);
++	if (err)
++		goto out;
++
++	upperdir = ovl_dentry_upper(new->d_parent);
++	mutex_lock_nested(&upperdir->d_inode->i_mutex, I_MUTEX_PARENT);
++	newdentry = ovl_lookup_create(upperdir, new);
++	err = PTR_ERR(newdentry);
++	if (IS_ERR(newdentry))
++		goto out_unlock;
++
++	olddentry = ovl_dentry_upper(old);
++	err = vfs_link(olddentry, upperdir->d_inode, newdentry);
++	if (!err) {
++		ovl_dentry_version_inc(new->d_parent);
++		ovl_dentry_update(new, newdentry);
++
++		ihold(old->d_inode);
++		d_instantiate(new, old->d_inode);
++	} else {
++		dput(newdentry);
++	}
++out_unlock:
++	mutex_unlock(&upperdir->d_inode->i_mutex);
++out:
++	return err;
++
++}
++
++static int ovl_rename(struct inode *olddir, struct dentry *old,
++			struct inode *newdir, struct dentry *new)
++{
++	int err;
++	enum ovl_path_type old_type;
++	struct dentry *old_upperdir;
++	struct dentry *new_upperdir;
++	struct dentry *olddentry;
++	struct dentry *newdentry;
++	struct dentry *trap;
++	bool is_dir = S_ISDIR(old->d_inode->i_mode);
++
++	/* Don't copy up directory trees */
++	old_type = ovl_path_type(old);
++	if (old_type != OVL_PATH_UPPER && is_dir)
++		return -EXDEV;
++
++	if (new->d_inode) {
++		enum ovl_path_type new_type;
++
++		new_type = ovl_path_type(new);
++
++		if (new_type == OVL_PATH_LOWER && old_type == OVL_PATH_LOWER) {
++			if (ovl_dentry_lower(old)->d_inode ==
++			    ovl_dentry_lower(new)->d_inode)
++				return 0;
++		}
++		if (new_type != OVL_PATH_LOWER && old_type != OVL_PATH_LOWER) {
++			if (ovl_dentry_upper(old)->d_inode ==
++			    ovl_dentry_upper(new)->d_inode)
++				return 0;
++		}
++
++		if (new_type != OVL_PATH_UPPER &&
++		    S_ISDIR(new->d_inode->i_mode)) {
++			err = ovl_check_empty_dir(new);
++			if (err)
++				return err;
++
++			if (new_type == OVL_PATH_MERGE) {
++				err = ovl_remove_whiteouts(new);
++				if (err)
++					return err;
++			}
++		}
++	}
++
++	err = ovl_copy_up(old);
++	if (err)
++		return err;
++
++	err = ovl_copy_up(new->d_parent);
++	if (err)
++		return err;
++
++	old_upperdir = ovl_dentry_upper(old->d_parent);
++	new_upperdir = ovl_dentry_upper(new->d_parent);
++
++	trap = lock_rename(new_upperdir, old_upperdir);
++
++	olddentry = ovl_dentry_upper(old);
++	newdentry = ovl_dentry_upper(new);
++	if (newdentry) {
++		dget(newdentry);
++	} else {
++		newdentry = ovl_lookup_create(new_upperdir, new);
++		err = PTR_ERR(newdentry);
++		if (IS_ERR(newdentry))
++			goto out_unlock;
++	}
++
++	err = -ESTALE;
++	if (olddentry->d_parent != old_upperdir)
++		goto out_dput;
++	if (newdentry->d_parent != new_upperdir)
++		goto out_dput;
++	if (olddentry == trap)
++		goto out_dput;
++	if (newdentry == trap)
++		goto out_dput;
++
++	err = vfs_rename(old_upperdir->d_inode, olddentry,
++			 new_upperdir->d_inode, newdentry);
++
++	if (!err) {
++		bool old_opaque = ovl_dentry_is_opaque(old);
++		bool new_opaque = ovl_dentry_is_opaque(new);
++
++		if (ovl_path_type(new) != OVL_PATH_UPPER)
++			new_opaque = true;
++
++		if (old_type != OVL_PATH_UPPER || old_opaque)
++			err = ovl_whiteout(old_upperdir, old);
++		if (!err && is_dir) {
++			if (old_opaque && !new_opaque) {
++				ovl_remove_opaque(olddentry);
++				ovl_dentry_set_opaque(old, false);
++			}
++			if (!old_opaque && new_opaque) {
++				err = ovl_set_opaque(olddentry);
++				ovl_dentry_set_opaque(old, true);
++			}
++		}
++		ovl_dentry_version_inc(old->d_parent);
++		ovl_dentry_version_inc(new->d_parent);
++	}
++
++out_dput:
++	dput(newdentry);
++out_unlock:
++	unlock_rename(new_upperdir, old_upperdir);
++	return err;
++}
++
++static bool ovl_is_private_xattr(const char *name)
++{
++	return strncmp(name, "trusted.overlay.", 14) == 0;
++}
++
++static int ovl_setxattr(struct dentry *dentry, const char *name,
++			  const void *value, size_t size, int flags)
++{
++	int err;
++	struct dentry *upperdentry;
++
++	if (ovl_is_private_xattr(name))
++		return -EPERM;
++
++	err = ovl_copy_up(dentry);
++	if (err)
++		return err;
++
++	upperdentry = ovl_dentry_upper(dentry);
++	return  vfs_setxattr(upperdentry, name, value, size, flags);
++}
++
++static ssize_t ovl_getxattr(struct dentry *dentry, const char *name,
++			      void *value, size_t size)
++{
++	if (ovl_path_type(dentry->d_parent) == OVL_PATH_MERGE &&
++	    ovl_is_private_xattr(name))
++		return -ENODATA;
++
++	return vfs_getxattr(ovl_dentry_real(dentry), name, value, size);
++}
++
++static ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size)
++{
++	ssize_t res;
++	int off;
++
++	res = vfs_listxattr(ovl_dentry_real(dentry), list, size);
++	if (res <= 0 || size == 0)
++		return res;
++
++	if (ovl_path_type(dentry->d_parent) != OVL_PATH_MERGE)
++		return res;
++
++	/* filter out private xattrs */
++	for (off = 0; off < res;) {
++		char *s = list + off;
++		size_t slen = strlen(s) + 1;
++
++		BUG_ON(off + slen > res);
++
++		if (ovl_is_private_xattr(s)) {
++			res -= slen;
++			memmove(s, s + slen, res - off);
++		} else {
++			off += slen;
++		}
++	}
++
++	return res;
++}
++
++static int ovl_removexattr(struct dentry *dentry, const char *name)
++{
++	int err;
++	struct path realpath;
++	enum ovl_path_type type;
++
++	if (ovl_path_type(dentry->d_parent) == OVL_PATH_MERGE &&
++	    ovl_is_private_xattr(name))
++		return -ENODATA;
++
++	type = ovl_path_real(dentry, &realpath);
++	if (type == OVL_PATH_LOWER) {
++		err = vfs_getxattr(realpath.dentry, name, NULL, 0);
++		if (err < 0)
++			return err;
++
++		err = ovl_copy_up(dentry);
++		if (err)
++			return err;
++
++		ovl_path_upper(dentry, &realpath);
++	}
++
++	return vfs_removexattr(realpath.dentry, name);
++}
++
++static bool ovl_open_need_copy_up(int flags, enum ovl_path_type type,
++				  struct dentry *realdentry)
++{
++	if (type != OVL_PATH_LOWER)
++		return false;
++
++	if (special_file(realdentry->d_inode->i_mode))
++		return false;
++
++	if (!(OPEN_FMODE(flags) & FMODE_WRITE) && !(flags & O_TRUNC))
++		return false;
++
++	return true;
++}
++
++static struct file *ovl_open(struct dentry *dentry, int flags,
++			     const struct cred *cred)
++{
++	int err;
++	struct path realpath;
++	enum ovl_path_type type;
++
++	type = ovl_path_real(dentry, &realpath);
++	if (ovl_open_need_copy_up(flags, type, realpath.dentry)) {
++		if (flags & O_TRUNC)
++			err = ovl_copy_up_truncate(dentry, 0);
++		else
++			err = ovl_copy_up(dentry);
++		if (err)
++			return ERR_PTR(err);
++
++		ovl_path_upper(dentry, &realpath);
++	}
++
++	return vfs_open(&realpath, flags, cred);
++}
++
++static const struct inode_operations ovl_dir_inode_operations = {
++	.lookup		= ovl_lookup,
++	.mkdir		= ovl_mkdir,
++	.symlink	= ovl_symlink,
++	.unlink		= ovl_unlink,
++	.rmdir		= ovl_rmdir,
++	.rename		= ovl_rename,
++	.link		= ovl_link,
++	.setattr	= ovl_setattr,
++	.create		= ovl_create,
++	.mknod		= ovl_mknod,
++	.permission	= ovl_permission,
++	.getattr	= ovl_dir_getattr,
++	.setxattr	= ovl_setxattr,
++	.getxattr	= ovl_getxattr,
++	.listxattr	= ovl_listxattr,
++	.removexattr	= ovl_removexattr,
++};
++
++static const struct inode_operations ovl_file_inode_operations = {
++	.setattr	= ovl_setattr,
++	.permission	= ovl_permission,
++	.getattr	= ovl_getattr,
++	.setxattr	= ovl_setxattr,
++	.getxattr	= ovl_getxattr,
++	.listxattr	= ovl_listxattr,
++	.removexattr	= ovl_removexattr,
++	.open		= ovl_open,
++};
++
++static const struct inode_operations ovl_symlink_inode_operations = {
++	.setattr	= ovl_setattr,
++	.follow_link	= ovl_follow_link,
++	.put_link	= ovl_put_link,
++	.readlink	= ovl_readlink,
++	.getattr	= ovl_getattr,
++	.setxattr	= ovl_setxattr,
++	.getxattr	= ovl_getxattr,
++	.listxattr	= ovl_listxattr,
++	.removexattr	= ovl_removexattr,
++};
++
++static struct inode *ovl_new_inode(struct super_block *sb, umode_t mode,
++				   struct ovl_entry *oe)
++{
++	struct inode *inode;
++
++	inode = new_inode(sb);
++	if (!inode)
++		return NULL;
++
++	mode &= S_IFMT;
++
++	inode->i_ino = get_next_ino();
++	inode->i_mode = mode;
++	inode->i_flags |= S_NOATIME | S_NOCMTIME;
++
++	switch (mode) {
++	case S_IFDIR:
++		inode->i_private = oe;
++		inode->i_op = &ovl_dir_inode_operations;
++		inode->i_fop = &ovl_dir_operations;
++		break;
++
++	case S_IFLNK:
++		inode->i_op = &ovl_symlink_inode_operations;
++		break;
++
++	case S_IFREG:
++	case S_IFSOCK:
++	case S_IFBLK:
++	case S_IFCHR:
++	case S_IFIFO:
++		inode->i_op = &ovl_file_inode_operations;
++		break;
++
++	default:
++		WARN(1, "illegal file type: %i\n", mode);
++		inode = NULL;
++	}
++
++	return inode;
++
++}
++
++static void ovl_put_super(struct super_block *sb)
++{
++	struct ovl_fs *ufs = sb->s_fs_info;
++
++	if (!(sb->s_flags & MS_RDONLY))
++		mnt_drop_write(ufs->upper_mnt);
++
++	mntput(ufs->upper_mnt);
++	mntput(ufs->lower_mnt);
++
++	kfree(ufs);
++}
++
++static int ovl_remount_fs(struct super_block *sb, int *flagsp, char *data)
++{
++	int flags = *flagsp;
++	struct ovl_fs *ufs = sb->s_fs_info;
++
++	/* When remounting rw or ro, we need to adjust the write access to the
++	 * upper fs.
++	 */
++	if (((flags ^ sb->s_flags) & MS_RDONLY) == 0)
++		/* No change to readonly status */
++		return 0;
++
++	if (flags & MS_RDONLY) {
++		mnt_drop_write(ufs->upper_mnt);
++		return 0;
++	} else
++		return mnt_want_write(ufs->upper_mnt);
++}
++
++/**
++ * ovl_statfs
++ * @sb: The overlayfs super block
++ * @buf: The struct kstatfs to fill in with stats
++ *
++ * Get the filesystem statistics.  As writes always target the upper layer
++ * filesystem pass the statfs to the same filesystem.
++ */
++static int ovl_statfs(struct dentry *dentry, struct kstatfs *buf)
++{
++	struct dentry *root_dentry = dentry->d_sb->s_root;
++	struct path path;
++	ovl_path_upper(root_dentry, &path);
++
++	if (!path.dentry->d_sb->s_op->statfs)
++		return -ENOSYS;
++	return path.dentry->d_sb->s_op->statfs(path.dentry, buf);
++}
++
++static const struct super_operations ovl_super_operations = {
++	.put_super	= ovl_put_super,
++	.remount_fs	= ovl_remount_fs,
++	.statfs		= ovl_statfs,
++};
++
++struct ovl_config {
++	char *lowerdir;
++	char *upperdir;
++};
++
++enum {
++	Opt_lowerdir,
++	Opt_upperdir,
++	Opt_err,
++};
++
++static const match_table_t ovl_tokens = {
++	{Opt_lowerdir,			"lowerdir=%s"},
++	{Opt_upperdir,			"upperdir=%s"},
++	{Opt_err,			NULL}
++};
++
++static int ovl_parse_opt(char *opt, struct ovl_config *config)
++{
++	char *p;
++
++	config->upperdir = NULL;
++	config->lowerdir = NULL;
++
++	while ((p = strsep(&opt, ",")) != NULL) {
++		int token;
++		substring_t args[MAX_OPT_ARGS];
++
++		if (!*p)
++			continue;
++
++		token = match_token(p, ovl_tokens, args);
++		switch (token) {
++		case Opt_upperdir:
++			kfree(config->upperdir);
++			config->upperdir = match_strdup(&args[0]);
++			if (!config->upperdir)
++				return -ENOMEM;
++			break;
++
++		case Opt_lowerdir:
++			kfree(config->lowerdir);
++			config->lowerdir = match_strdup(&args[0]);
++			if (!config->lowerdir)
++				return -ENOMEM;
++			break;
++
++		default:
++			return -EINVAL;
++		}
++	}
++	return 0;
++}
++
++static int ovl_fill_super(struct super_block *sb, void *data, int silent)
++{
++	struct path lowerpath;
++	struct path upperpath;
++	struct inode *root_inode;
++	struct dentry *root_dentry;
++	struct ovl_entry *oe;
++	struct ovl_fs *ufs;
++	struct ovl_config config;
++	int err;
++
++	err = ovl_parse_opt((char *) data, &config);
++	if (err)
++		goto out;
++
++	err = -EINVAL;
++	if (!config.upperdir || !config.lowerdir) {
++		printk(KERN_ERR "overlayfs: missing upperdir or lowerdir\n");
++		goto out_free_config;
++	}
++
++	err = -ENOMEM;
++	ufs = kmalloc(sizeof(struct ovl_fs), GFP_KERNEL);
++	if (!ufs)
++		goto out_free_config;
++
++	oe = ovl_alloc_entry();
++	if (oe == NULL)
++		goto out_free_ufs;
++
++	root_inode = ovl_new_inode(sb, S_IFDIR, oe);
++	if (!root_inode)
++		goto out_free_oe;
++
++	err = kern_path(config.upperdir, LOOKUP_FOLLOW, &upperpath);
++	if (err)
++		goto out_put_root;
++
++	err = kern_path(config.lowerdir, LOOKUP_FOLLOW, &lowerpath);
++	if (err)
++		goto out_put_upperpath;
++
++	err = -ENOTDIR;
++	if (!S_ISDIR(upperpath.dentry->d_inode->i_mode) ||
++	    !S_ISDIR(lowerpath.dentry->d_inode->i_mode))
++		goto out_put_lowerpath;
++
++	ufs->upper_mnt = clone_private_mount(&upperpath);
++	err = PTR_ERR(ufs->upper_mnt);
++	if (IS_ERR(ufs->upper_mnt)) {
++		printk(KERN_ERR "overlayfs: failed to clone upperpath\n");
++		goto out_put_lowerpath;
++	}
++
++	ufs->lower_mnt = clone_private_mount(&lowerpath);
++	err = PTR_ERR(ufs->lower_mnt);
++	if (IS_ERR(ufs->lower_mnt)) {
++		printk(KERN_ERR "overlayfs: failed to clone lowerpath\n");
++		goto out_put_upper_mnt;
++	}
++
++	if (!(sb->s_flags & MS_RDONLY)) {
++		err = mnt_want_write(ufs->upper_mnt);
++		if (err)
++			goto out_put_lower_mnt;
++	}
++
++	err = -ENOMEM;
++	root_dentry = d_alloc_root(root_inode);
++	if (!root_dentry)
++		goto out_drop_write;
++
++	mntput(upperpath.mnt);
++	mntput(lowerpath.mnt);
++
++	oe->__upperdentry = upperpath.dentry;
++	oe->lowerdentry = lowerpath.dentry;
++
++	root_dentry->d_fsdata = oe;
++	root_dentry->d_op = &ovl_dentry_operations;
++
++	sb->s_op = &ovl_super_operations;
++	sb->s_root = root_dentry;
++	sb->s_fs_info = ufs;
++
++	return 0;
++
++out_drop_write:
++	if (!(sb->s_flags & MS_RDONLY))
++		mnt_drop_write(ufs->upper_mnt);
++out_put_lower_mnt:
++	mntput(ufs->lower_mnt);
++out_put_upper_mnt:
++	mntput(ufs->upper_mnt);
++out_put_lowerpath:
++	path_put(&lowerpath);
++out_put_upperpath:
++	path_put(&upperpath);
++out_put_root:
++	iput(root_inode);
++out_free_oe:
++	kfree(oe);
++out_free_ufs:
++	kfree(ufs);
++out_free_config:
++	kfree(config.lowerdir);
++	kfree(config.upperdir);
++out:
++	return err;
++}
++
++static int ovl_get_sb(struct file_system_type *fs_type,
++			int flags, const char *dev_name,
++			void *raw_data, struct vfsmount *mnt)
++{
++	return get_sb_nodev(fs_type, flags, raw_data, ovl_fill_super, mnt);
++}
++
++static struct file_system_type ovl_fs_type = {
++	.owner		= THIS_MODULE,
++	.name		= "overlayfs",
++	.get_sb		= ovl_get_sb,
++	.kill_sb	= kill_anon_super,
++};
++
++static int __init ovl_init(void)
++{
++	return register_filesystem(&ovl_fs_type);
++}
++
++static void __exit ovl_exit(void)
++{
++	unregister_filesystem(&ovl_fs_type);
++}
++
++module_init(ovl_init);
++module_exit(ovl_exit);
+--- /dev/null
++++ b/Documentation/filesystems/overlayfs.txt
+@@ -0,0 +1,163 @@
++Written by: Neil Brown <neilb@suse.de>
++
++Overlay Filesystem
++==================
++
++This document describes a prototype for a new approach to providing
++overlay-filesystem functionality in Linux (sometimes referred to as
++union-filesystems).  An overlay-filesystem tries to present a
++filesystem which is the result over overlaying one filesystem on top
++of the other.
++
++The result will inevitably fail to look exactly like a normal
++filesystem for various technical reasons.  The expectation is that
++many use cases will be able to ignore these differences.
++
++This approach is 'hybrid' because the objects that appear in the
++filesystem do not all appear to belong to that filesystem.  In many
++case an object accessed in the union will be indistinguishable
++from accessing the corresponding object from the original filesystem.
++This is most obvious from the 'st_dev' field returned by stat(2).
++
++While directories will report an st_dev for the overlay-filesystem,
++all non-directory objects will report an st_dev whichever of the
++'lower' or 'upper' filesystem that is providing the object.  Similarly
++st_ino will only be unique when combined with st_dev, and both of
++these can change over the lifetime of a non-directory object.  Many
++applications and tools ignore these values and will not be affected.
++
++Upper and Lower
++---------------
++
++An overlay filesystem combines two filesystems - an 'upper' filesystem
++and a 'lower' filesystem.  When a name exists in both filesystems, the
++object in the 'upper' filesystem is visible while the object in the
++'lower' filesystem is either hidden or, in the case of directories,
++merged with the 'upper' object.
++
++It would be more correct to refer to an upper and lower 'directory
++tree' rather than 'filesystem' as it is quite possible for both
++directory trees to be in the same filesystem and there is no
++requirement that the root of a filesystem be given for either upper or
++lower.
++
++The lower filesystem can be any filesystem supported by Linux and does
++not need to be writable.  The lower filesystem can even be another
++overlayfs.  The upper filesystem will normally be writable and if it
++is it must support the creation of trusted.* extended attributes, and
++must provide valid d_type in readdir responses, at least for symbolic
++links - so NFS is not suitable.
++
++A read-only overlay of two read-only filesystems may use any
++filesystem type.
++
++Directories
++-----------
++
++Overlaying mainly involved directories.  If a given name appears in both
++upper and lower filesystems and refers to a non-directory in either,
++then the lower object is hidden - the name refers only to the upper
++object.
++
++Where both upper and lower objects are directories, a merged directory
++is formed.
++
++At mount time, the two directories given as mount options are combined
++into a merged directory.  Then whenever a lookup is requested in such
++a merged directory, the lookup is performed in each actual directory
++and the combined result is cached in the dentry belonging to the overlay
++filesystem.  If both actual lookups find directories, both are stored
++and a merged directory is created, otherwise only one is stored: the
++upper if it exists, else the lower.
++
++Only the lists of names from directories are merged.  Other content
++such as metadata and extended attributes are reported for the upper
++directory only.  These attributes of the lower directory are hidden.
++
++whiteouts and opaque directories
++--------------------------------
++
++In order to support rm and rmdir without changing the lower
++filesystem, an overlay filesystem needs to record in the upper filesystem
++that files have been removed.  This is done using whiteouts and opaque
++directories (non-directories are always opaque).
++
++The overlay filesystem uses extended attributes with a
++"trusted.overlay."  prefix to record these details.
++
++A whiteout is created as a symbolic link with target
++"(overlay-whiteout)" and with xattr "trusted.overlay.whiteout" set to "y".
++When a whiteout is found in the upper level of a merged directory, any
++matching name in the lower level is ignored, and the whiteout itself
++is also hidden.
++
++A directory is made opaque by setting the xattr "trusted.overlay.opaque"
++to "y".  Where the upper filesystem contains an opaque directory, any
++directory in the lower filesystem with the same name is ignored.
++
++readdir
++-------
++
++When a 'readdir' request is made on a merged directory, the upper and
++lower directories are each read and the name lists merged in the
++obvious way (upper is read first, then lower - entries that already
++exist are not re-added).  This merged name list is cached in the
++'struct file' and so remains as long as the file is kept open.  If the
++directory is opened and read by two processes at the same time, they
++will each have separate caches.  A seekdir to the start of the
++directory (offset 0) followed by a readdir will cause the cache to be
++discarded and rebuilt.
++
++This means that changes to the merged directory do not appear while a
++directory is being read.  This is unlikely to be noticed by many
++programs.
++
++seek offsets are assigned sequentially when the directories are read.
++Thus if
++  - read part of a directory
++  - remember an offset, and close the directory
++  - re-open the directory some time later
++  - seek to the remembered offset
++
++there may be little correlation between the old and new locations in
++the list of filenames, particularly if anything has changed in the
++directory.
++
++Readdir on directories that are not merged is simply handled by the
++underlying directory (upper or lower).
++
++
++Non-directories
++---------------
++
++Objects that are not directories (files, symlinks, device-special
++files etc) are presented either from the upper or lower filesystem as
++appropriate.  When a file in the lower filesystem is accessed in a way
++the requires write-access; such as opening for write access, changing
++some metadata etc, the file is first copied from the lower filesystem
++to the upper filesystem (copy_up).  Note that creating a hard-link
++also requires copy-up, though of course creation of a symlink does
++not.
++
++The copy_up process first makes sure that the containing directory
++exists in the upper filesystem - creating it and any parents as
++necessary.  It then creates the object with the same metadata (owner,
++mode, mtime, symlink-target etc) and then if the object is a file, the
++data is copied from the lower to the upper filesystem.  Finally any
++extended attributes are copied up.
++
++Once the copy_up is complete, the overlay filesystem simply
++provides direct access to the newly created file in the upper
++filesystem - future operations on the file are barely noticed by the
++overlay filesystem (though an operation on the name of the file such as
++rename or unlink will of course be noticed and handled).
++
++Changes to underlying filesystems
++---------------------------------
++
++Offline changes, when the overlay is not mounted, are allowed to either
++the upper or the lower trees.
++
++Changes to the underlying filesystems while part of a mounted overlay
++filesystem are not allowed.  This is not yet enforced, but will be in
++the future.
diff --git a/target/linux/generic/patches-2.6.37/210-mini_fo_2.6.25_fixes.patch b/target/linux/generic/patches-2.6.37/210-mini_fo_2.6.25_fixes.patch
deleted file mode 100644
index d021ec1b30..0000000000
--- a/target/linux/generic/patches-2.6.37/210-mini_fo_2.6.25_fixes.patch
+++ /dev/null
@@ -1,143 +0,0 @@
---- a/fs/mini_fo/main.c
-+++ b/fs/mini_fo/main.c
-@@ -79,6 +79,7 @@ mini_fo_tri_interpose(dentry_t *hidden_d
- 	 * of the new inode's fields
- 	 */
- 
-+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25)
- 	/*
- 	 * original: inode = iget(sb, hidden_inode->i_ino);
- 	 */
-@@ -87,6 +88,13 @@ mini_fo_tri_interpose(dentry_t *hidden_d
- 		err = -EACCES;		/* should be impossible??? */
- 		goto out;
- 	}
-+#else
-+	inode = mini_fo_iget(sb, iunique(sb, 25));
-+	if (IS_ERR(inode)) {
-+		err = PTR_ERR(inode);
-+		goto out;
-+	}
-+#endif
- 
- 	/*
- 	 * interpose the inode if not already interposed
-@@ -184,9 +192,9 @@ mini_fo_parse_options(super_block_t *sb,
- 				hidden_root = ERR_PTR(err);
- 				goto out;
- 			}
--			hidden_root = nd.dentry;
--			stopd(sb)->base_dir_dentry = nd.dentry;
--			stopd(sb)->hidden_mnt = nd.mnt;
-+			hidden_root = nd_get_dentry(&nd);
-+			stopd(sb)->base_dir_dentry = nd_get_dentry(&nd);
-+			stopd(sb)->hidden_mnt = nd_get_mnt(&nd);
- 
- 		} else if(!strncmp("sto=", options, 4)) {
- 			/* parse the storage dir */
-@@ -204,9 +212,9 @@ mini_fo_parse_options(super_block_t *sb,
- 				hidden_root2 = ERR_PTR(err);
- 				goto out;
- 			}
--			hidden_root2 = nd2.dentry;
--			stopd(sb)->storage_dir_dentry = nd2.dentry;
--			stopd(sb)->hidden_mnt2 = nd2.mnt;
-+			hidden_root2 = nd_get_dentry(&nd2);
-+			stopd(sb)->storage_dir_dentry = nd_get_dentry(&nd2);
-+			stopd(sb)->hidden_mnt2 = nd_get_mnt(&nd2);
- 			stohs2(sb) = hidden_root2->d_sb;
- 
- 			/* validate storage dir, this is done in
---- a/fs/mini_fo/mini_fo.h
-+++ b/fs/mini_fo/mini_fo.h
-@@ -302,6 +302,10 @@ extern int mini_fo_tri_interpose(dentry_
- extern int mini_fo_cp_cont(dentry_t *tgt_dentry, struct vfsmount *tgt_mnt,
- 			   dentry_t *src_dentry, struct vfsmount *src_mnt);
- 
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,25)
-+extern struct inode *mini_fo_iget(struct super_block *sb, unsigned long ino);
-+#endif
-+
- #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
- extern int mini_fo_create(inode_t *dir, dentry_t *dentry, int mode, struct nameidata *nd);
- 
-@@ -501,6 +505,29 @@ static inline void double_unlock(struct
- #endif  /* if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0) */
- #endif /* __KERNEL__ */
- 
-+
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,25)
-+static inline dentry_t *nd_get_dentry(struct nameidata *nd)
-+{
-+	return (nd->path.dentry);
-+}
-+
-+static inline struct vfsmount *nd_get_mnt(struct nameidata *nd)
-+{
-+	return (nd->path.mnt);
-+}
-+#else
-+static inline dentry_t *nd_get_dentry(struct nameidata *nd)
-+{
-+	return (nd->dentry);
-+}
-+
-+static inline struct vfsmount *nd_get_mnt(struct nameidata *nd)
-+{
-+	return (nd->mnt);
-+}
-+#endif
-+
- /*
-  * Definitions for user and kernel code
-  */
---- a/fs/mini_fo/super.c
-+++ b/fs/mini_fo/super.c
-@@ -266,10 +266,31 @@ mini_fo_umount_begin(super_block_t *sb)
- }
- #endif
- 
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,25)
-+struct inode *
-+mini_fo_iget(struct super_block *sb, unsigned long ino)
-+{
-+	struct inode *inode;
-+
-+	inode = iget_locked(sb, ino);
-+	if (!inode)
-+		return ERR_PTR(-ENOMEM);
-+
-+	if (!(inode->i_state & I_NEW))
-+		return inode;
-+
-+	mini_fo_read_inode(inode);
-+
-+	unlock_new_inode(inode);
-+	return inode;
-+}
-+#endif /* if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,25) */
- 
- struct super_operations mini_fo_sops =
- {
-+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25)
- 	read_inode:		mini_fo_read_inode,
-+#endif
- #if defined(FIST_DEBUG) || defined(FIST_FILTER_SCA)
- 	write_inode:	mini_fo_write_inode,
- #endif /* defined(FIST_DEBUG) || defined(FIST_FILTER_SCA) */
---- a/fs/mini_fo/aux.c
-+++ b/fs/mini_fo/aux.c
-@@ -164,11 +164,11 @@ dentry_t *bpath_walk(super_block_t *sb,
- 	err = vfs_path_lookup(mnt->mnt_root, mnt, bpath+1, 0, &nd);
- 
- 	/* validate */
--	if (err || !nd.dentry || !nd.dentry->d_inode) {
-+	if (err || !nd_get_dentry(&nd) || !nd_get_dentry(&nd)->d_inode) {
- 		printk(KERN_CRIT "mini_fo: bpath_walk: path_walk failed.\n");
- 		return NULL;
- 	}
--	return nd.dentry;
-+	return nd_get_dentry(&nd);
- }
- 
- 
diff --git a/target/linux/generic/patches-2.6.37/210-overlayfs_2.6.37_backport.patch b/target/linux/generic/patches-2.6.37/210-overlayfs_2.6.37_backport.patch
new file mode 100644
index 0000000000..b7638c05cd
--- /dev/null
+++ b/target/linux/generic/patches-2.6.37/210-overlayfs_2.6.37_backport.patch
@@ -0,0 +1,78 @@
+--- a/fs/overlayfs/overlayfs.c
++++ b/fs/overlayfs/overlayfs.c
+@@ -28,13 +28,8 @@ struct ovl_fs {
+ struct ovl_entry {
+ 	struct dentry *__upperdentry;
+ 	struct dentry *lowerdentry;
+-	union {
+-		struct {
+-			u64 version;
+-			bool opaque;
+-		};
+-		struct rcu_head rcu;
+-	};
++	u64 version;
++	bool opaque;
+ };
+ 
+ static const char *ovl_whiteout_xattr = "trusted.overlay.whiteout";
+@@ -632,12 +627,6 @@ static const struct file_operations ovl_
+ 
+ static const struct inode_operations ovl_dir_inode_operations;
+ 
+-static void ovl_entry_free(struct rcu_head *head)
+-{
+-	struct ovl_entry *oe = container_of(head, struct ovl_entry, rcu);
+-	kfree(oe);
+-}
+-
+ static void ovl_dentry_release(struct dentry *dentry)
+ {
+ 	struct ovl_entry *oe = dentry->d_fsdata;
+@@ -645,7 +634,7 @@ static void ovl_dentry_release(struct de
+ 	if (oe) {
+ 		dput(oe->__upperdentry);
+ 		dput(oe->lowerdentry);
+-		call_rcu(&oe->rcu, ovl_entry_free);
++		kfree(oe);
+ 	}
+ }
+ 
+@@ -1338,7 +1327,7 @@ static int ovl_dir_getattr(struct vfsmou
+ 	return 0;
+ }
+ 
+-static int ovl_permission(struct inode *inode, int mask, unsigned int flags)
++static int ovl_permission(struct inode *inode, int mask)
+ {
+ 	struct ovl_entry *oe;
+ 	struct dentry *alias = NULL;
+@@ -1349,8 +1338,6 @@ static int ovl_permission(struct inode *
+ 
+ 	if (S_ISDIR(inode->i_mode)) {
+ 		oe = inode->i_private;
+-	} else if (flags & IPERM_FLAG_RCU) {
+-		return -ECHILD;
+ 	} else {
+ 		/*
+ 		 * For non-directories find an alias and get the info
+@@ -1377,7 +1364,6 @@ static int ovl_permission(struct inode *
+ 	/* Careful in RCU walk mode */
+ 	realinode = ACCESS_ONCE(realdentry->d_inode);
+ 	if (!realinode) {
+-		WARN_ON(!(flags & IPERM_FLAG_RCU));
+ 		return -ENOENT;
+ 	}
+ 
+@@ -1402,9 +1388,9 @@ static int ovl_permission(struct inode *
+ 	}
+ 
+ 	if (realinode->i_op->permission)
+-		err = realinode->i_op->permission(realinode, mask, flags);
++		err = realinode->i_op->permission(realinode, mask);
+ 	else
+-		err = generic_permission(realinode, mask, flags,
++		err = generic_permission(realinode, mask,
+ 					 realinode->i_op->check_acl);
+ out_dput:
+ 	dput(alias);
diff --git a/target/linux/generic/patches-2.6.37/211-mini_fo_2.6.25_dentry_open_war.patch b/target/linux/generic/patches-2.6.37/211-mini_fo_2.6.25_dentry_open_war.patch
deleted file mode 100644
index 48a19429b9..0000000000
--- a/target/linux/generic/patches-2.6.37/211-mini_fo_2.6.25_dentry_open_war.patch
+++ /dev/null
@@ -1,66 +0,0 @@
---- a/fs/mini_fo/meta.c
-+++ b/fs/mini_fo/meta.c
-@@ -442,6 +442,11 @@ int meta_write_d_entry(dentry_t *dentry,
- 			   S_IRUSR | S_IWUSR);
- #endif
- 	}
-+
-+	/* $%& err, is this correct? */
-+	meta_mnt = stopd(dentry->d_inode->i_sb)->hidden_mnt2;
-+	mntget(meta_mnt);
-+
-         /* open META-file for writing */
-         meta_file = dentry_open(meta_dentry, meta_mnt, 0x1);
-         if(!meta_file || IS_ERR(meta_file)) {
-@@ -535,6 +540,11 @@ int meta_write_r_entry(dentry_t *dentry,
- 			   meta_dentry, S_IRUSR | S_IWUSR);
- #endif
- 	}
-+
-+	/* $%& err, is this correct? */
-+	meta_mnt = stopd(dentry->d_inode->i_sb)->hidden_mnt2;
-+	mntget(meta_mnt);
-+
-         /* open META-file for writing */
-         meta_file = dentry_open(meta_dentry, meta_mnt, 0x1);
-         if(!meta_file || IS_ERR(meta_file)) {
-@@ -671,14 +681,16 @@ int meta_sync_d_list(dentry_t *dentry, i
- 		}
- 	}
- 
-+	/* $%& err, is this correct? */
-+	meta_mnt = stopd(dentry->d_inode->i_sb)->hidden_mnt2;
-+	mntget(meta_mnt);
-+
-         /* open META-file for writing */
-         meta_file = dentry_open(meta_dentry, meta_mnt, 0x1);
-         if(!meta_file || IS_ERR(meta_file)) {
-                 printk(KERN_CRIT "mini_fo: meta_sync_d_list: \
-                                   ERROR opening meta file.\n");
--		/* we don't mntget so we dont't mntput (for now)
--		 * mntput(meta_mnt);
--		 */
-+		mntput(meta_mnt);
- 		dput(meta_dentry);
- 		err = -1;
-                 goto out;
-@@ -811,14 +823,16 @@ int meta_sync_r_list(dentry_t *dentry, i
- 		}
- 	}
- 
-+	/* $%& err, is this correct? */
-+	meta_mnt = stopd(dentry->d_inode->i_sb)->hidden_mnt2;
-+	mntget(meta_mnt);
-+
-         /* open META-file for writing */
-         meta_file = dentry_open(meta_dentry, meta_mnt, 0x1);
-         if(!meta_file || IS_ERR(meta_file)) {
-                 printk(KERN_CRIT "mini_fo: meta_sync_r_list: \
-                                   ERROR opening meta file.\n");
--		/* we don't mntget so we dont't mntput (for now)
--		 * mntput(meta_mnt);
--		 */
-+		mntput(meta_mnt);
- 		dput(meta_dentry);
- 		err = -1;
-                 goto out;
diff --git a/target/linux/generic/patches-2.6.37/211-overlayfs_fix_readdir_deadlock.patch b/target/linux/generic/patches-2.6.37/211-overlayfs_fix_readdir_deadlock.patch
new file mode 100644
index 0000000000..188be3d889
--- /dev/null
+++ b/target/linux/generic/patches-2.6.37/211-overlayfs_fix_readdir_deadlock.patch
@@ -0,0 +1,124 @@
+--- a/fs/overlayfs/overlayfs.c
++++ b/fs/overlayfs/overlayfs.c
+@@ -248,8 +248,7 @@ static struct ovl_cache_entry *ovl_cache
+ }
+ 
+ static struct ovl_cache_entry *ovl_cache_entry_new(const char *name, int len,
+-						   u64 ino, unsigned int d_type,
+-						   bool is_whiteout)
++						   u64 ino, unsigned int d_type)
+ {
+ 	struct ovl_cache_entry *p;
+ 
+@@ -262,7 +261,7 @@ static struct ovl_cache_entry *ovl_cache
+ 		p->len = len;
+ 		p->type = d_type;
+ 		p->ino = ino;
+-		p->is_whiteout = is_whiteout;
++		p->is_whiteout = false;
+ 	}
+ 
+ 	return p;
+@@ -270,7 +269,7 @@ static struct ovl_cache_entry *ovl_cache
+ 
+ static int ovl_cache_entry_add_rb(struct ovl_readdir_data *rdd,
+ 				  const char *name, int len, u64 ino,
+-				  unsigned int d_type, bool is_whiteout)
++				  unsigned int d_type)
+ {
+ 	struct rb_node **newp = &rdd->root->rb_node;
+ 	struct rb_node *parent = NULL;
+@@ -291,11 +290,18 @@ static int ovl_cache_entry_add_rb(struct
+ 			return 0;
+ 	}
+ 
+-	p = ovl_cache_entry_new(name, len, ino, d_type, is_whiteout);
++	p = ovl_cache_entry_new(name, len, ino, d_type);
+ 	if (p == NULL)
+ 		return -ENOMEM;
+ 
+-	list_add_tail(&p->l_node, rdd->list);
++	/*
++	 * Add links before other types to be able to quicky mark
++	 * any whiteout entries
++	 */
++	if (d_type == DT_LNK)
++		list_add(&p->l_node, rdd->list);
++	else
++		list_add_tail(&p->l_node, rdd->list);
+ 	rb_link_node(&p->node, parent, newp);
+ 	rb_insert_color(&p->node, rdd->root);
+ 
+@@ -313,7 +319,7 @@ static int ovl_fill_lower(void *buf, con
+ 	if (p) {
+ 		list_move_tail(&p->l_node, rdd->middle);
+ 	} else {
+-		p = ovl_cache_entry_new(name, namelen, ino, d_type, false);
++		p = ovl_cache_entry_new(name, namelen, ino, d_type);
+ 		if (p == NULL)
+ 			rdd->err = -ENOMEM;
+ 		else
+@@ -338,26 +344,9 @@ static int ovl_fill_upper(void *buf, con
+ 			  loff_t offset, u64 ino, unsigned int d_type)
+ {
+ 	struct ovl_readdir_data *rdd = buf;
+-	bool is_whiteout = false;
+ 
+ 	rdd->count++;
+-	if (d_type == DT_LNK) {
+-		struct dentry *dentry;
+-
+-		dentry = lookup_one_len(name, rdd->dir, namelen);
+-		if (IS_ERR(dentry)) {
+-			rdd->err = PTR_ERR(dentry);
+-			goto out;
+-		}
+-		is_whiteout = ovl_is_whiteout(dentry);
+-		dput(dentry);
+-	}
+-
+-	rdd->err = ovl_cache_entry_add_rb(rdd, name, namelen, ino, d_type,
+-					  is_whiteout);
+-
+-out:
+-	return rdd->err;
++	return ovl_cache_entry_add_rb(rdd, name, namelen, ino, d_type);
+ }
+ 
+ static int ovl_dir_read(struct path *realpath, struct ovl_readdir_data *rdd,
+@@ -423,6 +412,26 @@ static void ovl_dir_reset(struct file *f
+ 	}
+ }
+ 
++static void ovl_dir_mark_whiteouts(struct ovl_readdir_data *rdd)
++{
++	struct ovl_cache_entry *p;
++	struct dentry *dentry;
++
++	mutex_lock(&rdd->dir->d_inode->i_mutex);
++	list_for_each_entry(p, rdd->list, l_node) {
++		if (p->type != DT_LNK)
++			break;
++
++		dentry = lookup_one_len(p->name, rdd->dir, p->len);
++		if (IS_ERR(dentry))
++			continue;
++
++		p->is_whiteout = ovl_is_whiteout(dentry);
++		dput(dentry);
++	}
++	mutex_unlock(&rdd->dir->d_inode->i_mutex);
++}
++
+ static int ovl_dir_read_merged(struct path *upperpath, struct path *lowerpath,
+ 			       struct ovl_readdir_data *rdd)
+ {
+@@ -436,6 +445,8 @@ static int ovl_dir_read_merged(struct pa
+ 		err = ovl_dir_read(upperpath, rdd, ovl_fill_upper);
+ 		if (err)
+ 			goto out;
++
++		ovl_dir_mark_whiteouts(rdd);
+ 	}
+ 	/*
+ 	 * Insert lowerpath entries before upperpath ones, this allows
diff --git a/target/linux/generic/patches-2.6.37/212-mini_fo_2.6.26_fixes.patch b/target/linux/generic/patches-2.6.37/212-mini_fo_2.6.26_fixes.patch
deleted file mode 100644
index d2a843c82e..0000000000
--- a/target/linux/generic/patches-2.6.37/212-mini_fo_2.6.26_fixes.patch
+++ /dev/null
@@ -1,37 +0,0 @@
---- a/fs/mini_fo/super.c
-+++ b/fs/mini_fo/super.c
-@@ -84,6 +84,7 @@ mini_fo_write_inode(inode_t *inode, int
- #endif /* defined(FIST_DEBUG) || defined(FIST_FILTER_SCA) */
- 
- 
-+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26)
- STATIC void
- mini_fo_put_inode(inode_t *inode)
- {
-@@ -99,6 +100,7 @@ mini_fo_put_inode(inode_t *inode)
- 	if (atomic_read(&inode->i_count) == 1)
- 		inode->i_nlink = 0;
- }
-+#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26) */
- 
- 
- #if defined(FIST_DEBUG) || defined(FIST_FILTER_SCA)
-@@ -242,7 +244,7 @@ mini_fo_clear_inode(inode_t *inode)
-  * dies.
-  */
- STATIC void
--#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
-+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)) && (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26))
- mini_fo_umount_begin(struct vfsmount *mnt, int flags)
- {
- 	struct vfsmount *hidden_mnt;
-@@ -294,7 +296,9 @@ struct super_operations mini_fo_sops =
- #if defined(FIST_DEBUG) || defined(FIST_FILTER_SCA)
- 	write_inode:	mini_fo_write_inode,
- #endif /* defined(FIST_DEBUG) || defined(FIST_FILTER_SCA) */
-+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26)
- 	put_inode:		mini_fo_put_inode,
-+#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26) */
- #if defined(FIST_DEBUG) || defined(FIST_FILTER_SCA)
- 	delete_inode:	mini_fo_delete_inode,
- #endif /* defined(FIST_DEBUG) || defined(FIST_FILTER_SCA) */
diff --git a/target/linux/generic/patches-2.6.37/213-mini_fo_2.6.27_fixes.patch b/target/linux/generic/patches-2.6.37/213-mini_fo_2.6.27_fixes.patch
deleted file mode 100644
index f92c18b254..0000000000
--- a/target/linux/generic/patches-2.6.37/213-mini_fo_2.6.27_fixes.patch
+++ /dev/null
@@ -1,41 +0,0 @@
---- a/fs/mini_fo/inode.c
-+++ b/fs/mini_fo/inode.c
-@@ -439,7 +439,7 @@ mini_fo_symlink(inode_t *dir, dentry_t *
- 	int err=0;
- 	dentry_t *hidden_sto_dentry;
- 	dentry_t *hidden_sto_dir_dentry;
--#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)) && (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,27))
-         umode_t mode;
- #endif
- 
-@@ -466,7 +466,7 @@ mini_fo_symlink(inode_t *dir, dentry_t *
- 	down(&hidden_sto_dir_dentry->d_inode->i_sem);
- #endif
- 
--#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)) && (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,27))
- 	mode = S_IALLUGO;
- 	err = vfs_symlink(hidden_sto_dir_dentry->d_inode,
- 			  hidden_sto_dentry, symname, mode);
-@@ -1128,7 +1128,7 @@ void mini_fo_put_link(struct dentry *den
- #endif
- 
- STATIC int
--#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)) && (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,27))
- mini_fo_permission(inode_t *inode, int mask, struct nameidata *nd)
- #else
- mini_fo_permission(inode_t *inode, int mask)
-@@ -1150,8 +1150,9 @@ mini_fo_permission(inode_t *inode, int m
- 	 *	if (err)
- 	 *		goto out;
- 	 */
--
--#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,27)
-+	err = inode_permission(hidden_inode, mask);
-+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
- 	err = permission(hidden_inode, mask, nd);
- #else
- 	err = permission(hidden_inode, mask);
diff --git a/target/linux/generic/patches-2.6.37/214-mini_fo_2.6.29.patch b/target/linux/generic/patches-2.6.37/214-mini_fo_2.6.29.patch
deleted file mode 100644
index 63d704bf51..0000000000
--- a/target/linux/generic/patches-2.6.37/214-mini_fo_2.6.29.patch
+++ /dev/null
@@ -1,96 +0,0 @@
---- a/fs/mini_fo/aux.c
-+++ b/fs/mini_fo/aux.c
-@@ -236,7 +236,7 @@ int mini_fo_cp_cont(dentry_t *tgt_dentry
- 	mntget(src_mnt);
- 
- 	/* open file write only */
--	tgt_file = dentry_open(tgt_dentry, tgt_mnt, 0x1);
-+	tgt_file = dentry_open(tgt_dentry, tgt_mnt, 0x1, current_cred());
- 	if(!tgt_file || IS_ERR(tgt_file)) {
- 		printk(KERN_CRIT "mini_fo_cp_cont: ERROR opening target file.\n");
- 		err = PTR_ERR(tgt_file);
-@@ -244,7 +244,7 @@ int mini_fo_cp_cont(dentry_t *tgt_dentry
- 	}
- 
- 	/* open file read only */
--	src_file = dentry_open(src_dentry, src_mnt, 0x0);
-+	src_file = dentry_open(src_dentry, src_mnt, 0x0, current_cred());
- 	if(!src_file || IS_ERR(src_file)) {
- 		printk(KERN_CRIT "mini_fo_cp_cont: ERROR opening source file.\n");
- 		err = PTR_ERR(src_file);
---- a/fs/mini_fo/file.c
-+++ b/fs/mini_fo/file.c
-@@ -437,7 +437,7 @@ mini_fo_open(inode_t *inode, file_t *fil
- 			mntget(stopd(inode->i_sb)->hidden_mnt);
- 			hidden_file = dentry_open(hidden_dentry,
- 						  stopd(inode->i_sb)->hidden_mnt,
--						  hidden_flags);
-+						  hidden_flags, file->f_cred);
- 			if (IS_ERR(hidden_file)) {
- 				err = PTR_ERR(hidden_file);
- 				dput(hidden_dentry);
-@@ -479,7 +479,7 @@ mini_fo_open(inode_t *inode, file_t *fil
- 			mntget(stopd(inode->i_sb)->hidden_mnt);
- 			hidden_file = dentry_open(hidden_dentry,
- 						  stopd(inode->i_sb)->hidden_mnt,
--						  hidden_flags);
-+						  hidden_flags, file->f_cred);
- 			if (IS_ERR(hidden_file)) {
- 				err = PTR_ERR(hidden_file);
- 				dput(hidden_dentry);
-@@ -512,7 +512,7 @@ mini_fo_open(inode_t *inode, file_t *fil
- 	mntget(stopd(inode->i_sb)->hidden_mnt2);
- 	hidden_sto_file = dentry_open(hidden_sto_dentry,
- 				      stopd(inode->i_sb)->hidden_mnt2,
--				      hidden_flags);
-+				      hidden_flags, file->f_cred);
- 
- 	/* dentry_open dputs the dentry if it fails */
- 	if (IS_ERR(hidden_sto_file)) {
---- a/fs/mini_fo/meta.c
-+++ b/fs/mini_fo/meta.c
-@@ -56,7 +56,7 @@ int meta_build_lists(dentry_t *dentry)
- 
- 
- 		/* open META-file for reading */
--		meta_file = dentry_open(meta_dentry, meta_mnt, 0x0);
-+		meta_file = dentry_open(meta_dentry, meta_mnt, 0x0, current_cred());
- 		if(!meta_file || IS_ERR(meta_file)) {
- 			printk(KERN_CRIT "mini_fo: meta_build_lists: \
-                                           ERROR opening META file.\n");
-@@ -448,7 +448,7 @@ int meta_write_d_entry(dentry_t *dentry,
- 	mntget(meta_mnt);
- 
-         /* open META-file for writing */
--        meta_file = dentry_open(meta_dentry, meta_mnt, 0x1);
-+        meta_file = dentry_open(meta_dentry, meta_mnt, 0x1, current_cred());
-         if(!meta_file || IS_ERR(meta_file)) {
-                 printk(KERN_CRIT "mini_fo: meta_write_d_entry: \
-                                   ERROR opening meta file.\n");
-@@ -546,7 +546,7 @@ int meta_write_r_entry(dentry_t *dentry,
- 	mntget(meta_mnt);
- 
-         /* open META-file for writing */
--        meta_file = dentry_open(meta_dentry, meta_mnt, 0x1);
-+        meta_file = dentry_open(meta_dentry, meta_mnt, 0x1, current_cred());
-         if(!meta_file || IS_ERR(meta_file)) {
-                 printk(KERN_CRIT "mini_fo: meta_write_r_entry: \
-                                   ERROR opening meta file.\n");
-@@ -686,7 +686,7 @@ int meta_sync_d_list(dentry_t *dentry, i
- 	mntget(meta_mnt);
- 
-         /* open META-file for writing */
--        meta_file = dentry_open(meta_dentry, meta_mnt, 0x1);
-+        meta_file = dentry_open(meta_dentry, meta_mnt, 0x1, current_cred());
-         if(!meta_file || IS_ERR(meta_file)) {
-                 printk(KERN_CRIT "mini_fo: meta_sync_d_list: \
-                                   ERROR opening meta file.\n");
-@@ -828,7 +828,7 @@ int meta_sync_r_list(dentry_t *dentry, i
- 	mntget(meta_mnt);
- 
-         /* open META-file for writing */
--        meta_file = dentry_open(meta_dentry, meta_mnt, 0x1);
-+        meta_file = dentry_open(meta_dentry, meta_mnt, 0x1, current_cred());
-         if(!meta_file || IS_ERR(meta_file)) {
-                 printk(KERN_CRIT "mini_fo: meta_sync_r_list: \
-                                   ERROR opening meta file.\n");
diff --git a/target/linux/generic/patches-2.6.37/215-mini_fo_2.6.30.patch b/target/linux/generic/patches-2.6.37/215-mini_fo_2.6.30.patch
deleted file mode 100644
index 2d20920614..0000000000
--- a/target/linux/generic/patches-2.6.37/215-mini_fo_2.6.30.patch
+++ /dev/null
@@ -1,157 +0,0 @@
---- a/fs/mini_fo/aux.c
-+++ b/fs/mini_fo/aux.c
-@@ -86,8 +86,10 @@ int get_neg_sto_dentry(dentry_t *dentry)
- 	len = dentry->d_name.len;
- 	name = dentry->d_name.name;
- 
-+	mutex_lock(&dtohd2(dentry->d_parent)->d_inode->i_mutex);
- 	dtohd2(dentry) =
- 		lookup_one_len(name, dtohd2(dentry->d_parent), len);
-+	mutex_unlock(&dtohd2(dentry->d_parent)->d_inode->i_mutex);
- 
-  out:
- 	return err;
-@@ -426,7 +428,9 @@ int build_sto_structure(dentry_t *dir, d
- 		const unsigned char *name;
- 		len = dtohd(dentry)->d_name.len;
- 		name = dtohd(dentry)->d_name.name;
-+		mutex_lock(&dtohd2(dir)->d_inode->i_mutex);
- 		hidden_sto_dentry = lookup_one_len(name, dtohd2(dir), len);
-+		mutex_unlock(&dtohd2(dir)->d_inode->i_mutex);
- 		dtohd2(dentry) = hidden_sto_dentry;
- 	}
- 
---- a/fs/mini_fo/inode.c
-+++ b/fs/mini_fo/inode.c
-@@ -113,17 +113,23 @@ mini_fo_lookup(inode_t *dir, dentry_t *d
- 		hidden_dir_dentry = hidden_dentry->d_parent;
- 		kfree(bpath);
- 	}
--	else if(hidden_dir_dentry && hidden_dir_dentry->d_inode)
-+	else if(hidden_dir_dentry && hidden_dir_dentry->d_inode) {
-+		mutex_lock(&hidden_dir_dentry->d_inode->i_mutex);
- 		hidden_dentry =
- 			lookup_one_len(name, hidden_dir_dentry, namelen);
--	else
-+		mutex_unlock(&hidden_dir_dentry->d_inode->i_mutex);
-+	} else {
- 		hidden_dentry = NULL;
-+	}
- 
--	if(hidden_sto_dir_dentry && hidden_sto_dir_dentry->d_inode)
-+	if(hidden_sto_dir_dentry && hidden_sto_dir_dentry->d_inode) {
-+		mutex_lock(&hidden_sto_dir_dentry->d_inode->i_mutex);
- 		hidden_sto_dentry =
- 			lookup_one_len(name, hidden_sto_dir_dentry, namelen);
--	else
-+		mutex_unlock(&hidden_sto_dir_dentry->d_inode->i_mutex);
-+	} else {
- 		hidden_sto_dentry =  NULL;
-+	}
- 
- 	/* catch error in lookup */
- 	if (IS_ERR(hidden_dentry) || IS_ERR(hidden_sto_dentry)) {
-@@ -553,9 +559,11 @@ mini_fo_rmdir(inode_t *dir, dentry_t *de
- #endif
- 
- 		/* Delete an old WOL file contained in the storage dir */
-+		mutex_lock(&hidden_sto_dentry->d_inode->i_mutex);
- 		meta_dentry = lookup_one_len(META_FILENAME,
- 					     hidden_sto_dentry,
- 					     strlen(META_FILENAME));
-+		mutex_unlock(&hidden_sto_dentry->d_inode->i_mutex);
- 		if(meta_dentry->d_inode) {
- 			err = vfs_unlink(hidden_sto_dentry->d_inode, meta_dentry);
- 			dput(meta_dentry);
-@@ -643,9 +651,11 @@ mini_fo_rmdir(inode_t *dir, dentry_t *de
- #endif
- 
- 		/* Delete an old WOL file contained in the storage dir */
-+		mutex_lock(&hidden_sto_dentry->d_inode->i_mutex);
- 		meta_dentry = lookup_one_len(META_FILENAME,
- 					     hidden_sto_dentry,
- 					     strlen(META_FILENAME));
-+		mutex_unlock(&hidden_sto_dentry->d_inode->i_mutex);
- 		if(meta_dentry->d_inode) {
- 			/* is this necessary? dget(meta_dentry); */
- 			err = vfs_unlink(hidden_sto_dentry->d_inode,
-@@ -688,9 +698,11 @@ mini_fo_rmdir(inode_t *dir, dentry_t *de
- #endif
- 
- 		/* Delete an old WOL file contained in the storage dir */
-+		mutex_lock(&hidden_sto_dentry->d_inode->i_mutex);
- 		meta_dentry = lookup_one_len(META_FILENAME,
- 					     hidden_sto_dentry,
- 					     strlen(META_FILENAME));
-+		mutex_unlock(&hidden_sto_dentry->d_inode->i_mutex);
- 		if(meta_dentry->d_inode) {
- 			/* is this necessary? dget(meta_dentry); */
- 			err = vfs_unlink(hidden_sto_dentry->d_inode,
---- a/fs/mini_fo/meta.c
-+++ b/fs/mini_fo/meta.c
-@@ -43,9 +43,11 @@ int meta_build_lists(dentry_t *dentry)
- 
-   	/* might there be a META-file? */
- 	if(dtohd2(dentry) && dtohd2(dentry)->d_inode) {
-+		mutex_lock(&dtohd2(dentry)->d_inode->i_mutex);
- 		meta_dentry = lookup_one_len(META_FILENAME,
- 					     dtohd2(dentry),
- 					     strlen(META_FILENAME));
-+		mutex_unlock(&dtohd2(dentry)->d_inode->i_mutex);
- 		if(!meta_dentry->d_inode) {
- 			dput(meta_dentry);
- 			goto out_ok;
-@@ -426,8 +428,11 @@ int meta_write_d_entry(dentry_t *dentry,
- 			goto out;
-                 }
-         }
-+
-+	mutex_lock(&dtohd2(dentry)->d_inode->i_mutex);
- 	meta_dentry = lookup_one_len(META_FILENAME,
- 				     dtohd2(dentry), strlen (META_FILENAME));
-+	mutex_unlock(&dtohd2(dentry)->d_inode->i_mutex);
- 
- 	/* We need to create a META-file */
-         if(!meta_dentry->d_inode) {
-@@ -527,9 +532,13 @@ int meta_write_r_entry(dentry_t *dentry,
- 			goto out;
-                 }
-         }
-+
-+	mutex_lock(&dtohd2(dentry)->d_inode->i_mutex);
- 	meta_dentry = lookup_one_len(META_FILENAME,
- 				     dtohd2(dentry),
- 				     strlen (META_FILENAME));
-+	mutex_unlock(&dtohd2(dentry)->d_inode->i_mutex);
-+
-         if(!meta_dentry->d_inode) {
-                 /* We need to create a META-file */
- #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-@@ -641,9 +650,13 @@ int meta_sync_d_list(dentry_t *dentry, i
- 			goto out;
-                 }
-         }
-+
-+	mutex_lock(&dtohd2(dentry)->d_inode->i_mutex);
- 	meta_dentry = lookup_one_len(META_FILENAME,
- 				     dtohd2(dentry),
- 				     strlen(META_FILENAME));
-+	mutex_unlock(&dtohd2(dentry)->d_inode->i_mutex);
-+
-         if(!meta_dentry->d_inode) {
-                 /* We need to create a META-file */
- #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-@@ -784,9 +797,13 @@ int meta_sync_r_list(dentry_t *dentry, i
- 			goto out;
-                 }
-         }
-+
-+	mutex_lock(&dtohd2(dentry)->d_inode->i_mutex);
- 	meta_dentry = lookup_one_len(META_FILENAME,
- 				     dtohd2(dentry),
- 				     strlen(META_FILENAME));
-+	mutex_unlock(&dtohd2(dentry)->d_inode->i_mutex);
-+
-         if(!meta_dentry->d_inode) {
-                 /* We need to create a META-file */
- #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
diff --git a/target/linux/generic/patches-2.6.37/216-mini_fo_locking.patch b/target/linux/generic/patches-2.6.37/216-mini_fo_locking.patch
deleted file mode 100644
index 4f075920fb..0000000000
--- a/target/linux/generic/patches-2.6.37/216-mini_fo_locking.patch
+++ /dev/null
@@ -1,25 +0,0 @@
---- a/fs/mini_fo/state.c
-+++ b/fs/mini_fo/state.c
-@@ -537,17 +537,17 @@ int nondir_mod_to_del(dentry_t *dentry)
- 	dtohd(dentry) = NULL;
- 	dtost(dentry) = DELETED;
- 
--	/* add deleted file to META-file */
--	meta_add_d_entry(dentry->d_parent,
--			 dentry->d_name.name,
--			 dentry->d_name.len);
--
- 	/* was: unlock_dir(hidden_sto_dir_dentry); */
- #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
- 	mutex_unlock(&hidden_sto_dir_dentry->d_inode->i_mutex);
- #else
- 	up(&hidden_sto_dir_dentry->d_inode->i_sem);
- #endif
-+	/* add deleted file to META-file */
-+	meta_add_d_entry(dentry->d_parent,
-+			 dentry->d_name.name,
-+			 dentry->d_name.len);
-+
- 	dput(hidden_sto_dir_dentry);
- 
-  out:
diff --git a/target/linux/generic/patches-2.6.37/217-mini_fo_2.6.35.patch b/target/linux/generic/patches-2.6.37/217-mini_fo_2.6.35.patch
deleted file mode 100644
index 61f54f0359..0000000000
--- a/target/linux/generic/patches-2.6.37/217-mini_fo_2.6.35.patch
+++ /dev/null
@@ -1,45 +0,0 @@
---- a/fs/mini_fo/file.c
-+++ b/fs/mini_fo/file.c
-@@ -599,7 +599,7 @@ mini_fo_release(inode_t *inode, file_t *
- }
- 
- STATIC int
--mini_fo_fsync(file_t *file, dentry_t *dentry, int datasync)
-+mini_fo_fsync(file_t *file, int datasync)
- {
- 	int err1 = 0;
- 	int err2 = 0;
-@@ -609,14 +609,14 @@ mini_fo_fsync(file_t *file, dentry_t *de
- 	check_mini_fo_file(file);
- 
- 	if ((hidden_file = ftohf(file)) != NULL) {
--		hidden_dentry = dtohd(dentry);
-+		hidden_dentry = dtohd(file->f_path.dentry);
- 		if (hidden_file->f_op && hidden_file->f_op->fsync) {
- #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
- 			mutex_lock(&hidden_dentry->d_inode->i_mutex);
- #else
- 			down(&hidden_dentry->d_inode->i_sem);
- #endif
--			err1 = hidden_file->f_op->fsync(hidden_file, hidden_dentry, datasync);
-+			err1 = hidden_file->f_op->fsync(hidden_file, datasync);
- #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
- 			mutex_unlock(&hidden_dentry->d_inode->i_mutex);
- #else
-@@ -626,14 +626,14 @@ mini_fo_fsync(file_t *file, dentry_t *de
- 	}
- 
- 	if ((hidden_file = ftohf2(file)) != NULL) {
--		hidden_dentry = dtohd2(dentry);
-+		hidden_dentry = dtohd2(file->f_path.dentry);
- 		if (hidden_file->f_op && hidden_file->f_op->fsync) {
- #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
- 			mutex_lock(&hidden_dentry->d_inode->i_mutex);
- #else
- 			down(&hidden_dentry->d_inode->i_sem);
- #endif
--			err2 = hidden_file->f_op->fsync(hidden_file, hidden_dentry, datasync);
-+			err2 = hidden_file->f_op->fsync(hidden_file, datasync);
- #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
- 			mutex_unlock(&hidden_dentry->d_inode->i_mutex);
- #else
diff --git a/target/linux/generic/patches-2.6.37/217-mini_fo_2.6.36_fixes.patch b/target/linux/generic/patches-2.6.37/217-mini_fo_2.6.36_fixes.patch
deleted file mode 100644
index 79024adbb7..0000000000
--- a/target/linux/generic/patches-2.6.37/217-mini_fo_2.6.36_fixes.patch
+++ /dev/null
@@ -1,43 +0,0 @@
---- a/fs/mini_fo/super.c
-+++ b/fs/mini_fo/super.c
-@@ -76,7 +76,7 @@ mini_fo_read_inode(inode_t *inode)
-  * to write some of our own stuff to disk.
-  */
- STATIC void
--mini_fo_write_inode(inode_t *inode, int sync)
-+mini_fo_write_inode(inode_t *inode, struct writeback_control *wbc)
- {
- 	print_entry_location();
- 	print_exit_location();
-@@ -112,13 +112,14 @@ mini_fo_put_inode(inode_t *inode)
-  * on our and the lower inode.
-  */
- STATIC void
--mini_fo_delete_inode(inode_t *inode)
-+mini_fo_evict_inode(inode_t *inode)
- {
- 	print_entry_location();
- 
--	fist_checkinode(inode, "mini_fo_delete_inode IN");
--	inode->i_size = 0;		/* every f/s seems to do that */
--	clear_inode(inode);
-+	fist_checkinode(inode, "mini_fo_evict_inode IN");
-+	truncate_inode_pages(&inode->i_data, 0); /* FIXME: do we need this? */
-+	invalidate_inode_buffers(inode);
-+	end_writeback(inode);
- 
- 	print_exit_location();
- }
-@@ -300,11 +301,10 @@ struct super_operations mini_fo_sops =
- 	put_inode:		mini_fo_put_inode,
- #endif /* LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26) */
- #if defined(FIST_DEBUG) || defined(FIST_FILTER_SCA)
--	delete_inode:	mini_fo_delete_inode,
-+	evict_inode:	mini_fo_evict_inode,
- #endif /* defined(FIST_DEBUG) || defined(FIST_FILTER_SCA) */
- 	put_super:		mini_fo_put_super,
- 	statfs:		mini_fo_statfs,
- 	remount_fs:		mini_fo_remount_fs,
--	clear_inode:	mini_fo_clear_inode,
- 	umount_begin:	mini_fo_umount_begin,
- };
diff --git a/target/linux/generic/patches-2.6.37/218-mini_fo_dentry_check.patch b/target/linux/generic/patches-2.6.37/218-mini_fo_dentry_check.patch
deleted file mode 100644
index cf53e4826f..0000000000
--- a/target/linux/generic/patches-2.6.37/218-mini_fo_dentry_check.patch
+++ /dev/null
@@ -1,48 +0,0 @@
---- a/fs/mini_fo/meta.c
-+++ b/fs/mini_fo/meta.c
-@@ -48,6 +48,9 @@ int meta_build_lists(dentry_t *dentry)
- 					     dtohd2(dentry),
- 					     strlen(META_FILENAME));
- 		mutex_unlock(&dtohd2(dentry)->d_inode->i_mutex);
-+		if (IS_ERR(meta_dentry))
-+			goto out_ok;
-+
- 		if(!meta_dentry->d_inode) {
- 			dput(meta_dentry);
- 			goto out_ok;
-@@ -433,6 +436,8 @@ int meta_write_d_entry(dentry_t *dentry,
- 	meta_dentry = lookup_one_len(META_FILENAME,
- 				     dtohd2(dentry), strlen (META_FILENAME));
- 	mutex_unlock(&dtohd2(dentry)->d_inode->i_mutex);
-+	if (IS_ERR(meta_dentry))
-+		return PTR_ERR(meta_dentry);
- 
- 	/* We need to create a META-file */
-         if(!meta_dentry->d_inode) {
-@@ -538,6 +543,8 @@ int meta_write_r_entry(dentry_t *dentry,
- 				     dtohd2(dentry),
- 				     strlen (META_FILENAME));
- 	mutex_unlock(&dtohd2(dentry)->d_inode->i_mutex);
-+	if (IS_ERR(meta_dentry))
-+		return PTR_ERR(meta_dentry);
- 
-         if(!meta_dentry->d_inode) {
-                 /* We need to create a META-file */
-@@ -656,6 +663,8 @@ int meta_sync_d_list(dentry_t *dentry, i
- 				     dtohd2(dentry),
- 				     strlen(META_FILENAME));
- 	mutex_unlock(&dtohd2(dentry)->d_inode->i_mutex);
-+	if (IS_ERR(meta_dentry))
-+		return PTR_ERR(meta_dentry);
- 
-         if(!meta_dentry->d_inode) {
-                 /* We need to create a META-file */
-@@ -803,6 +812,8 @@ int meta_sync_r_list(dentry_t *dentry, i
- 				     dtohd2(dentry),
- 				     strlen(META_FILENAME));
- 	mutex_unlock(&dtohd2(dentry)->d_inode->i_mutex);
-+	if (IS_ERR(meta_dentry))
-+		return PTR_ERR(meta_dentry);
- 
-         if(!meta_dentry->d_inode) {
-                 /* We need to create a META-file */