kernel: split patches folder up into backport, pending and hack folders

* properly format/comment all patches
* merge debloat patches
* merge Kconfig patches
* merge swconfig patches
* merge hotplug patches
* drop 200-fix_localversion.patch - upstream
* drop 222-arm_zimage_none.patch - unused
* drop 252-mv_cesa_depends.patch - no longer required
* drop 410-mtd-move-forward-declaration-of-struct-mtd_info.patch - unused
* drop 661-fq_codel_keep_dropped_stats.patch - outdated
* drop 702-phy_add_aneg_done_function.patch - upstream
* drop 840-rtc7301.patch - unused
* drop 841-rtc_pt7c4338.patch - upstream
* drop 921-use_preinit_as_init.patch - unused
* drop spio-gpio-old and gpio-mmc - unused

Signed-off-by: John Crispin <john@phrozen.org>

1 files changed, 343 insertions, 0 deletions

diff --git a/target/linux/generic/pending-4.4/052-02-ubifs-Implement-RENAME_WHITEOUT.patch b/target/linux/generic/pending-4.4/052-02-ubifs-Implement-RENAME_WHITEOUT.patch
new file mode 100644
index 0000000000..c2ec904939
--- /dev/null
+++ b/target/linux/generic/pending-4.4/052-02-ubifs-Implement-RENAME_WHITEOUT.patch
@@ -0,0 +1,343 @@
+From: Richard Weinberger <richard@nod.at>
+Date: Tue, 13 Sep 2016 16:18:56 +0200
+Subject: [PATCH] ubifs: Implement RENAME_WHITEOUT
+
+Adds RENAME_WHITEOUT support to UBIFS, we implement
+it in the same way as ext4 and xfs do.
+For an overview of other ways to implement it please
+refere to commit 7dcf5c3e4527 ("xfs: add RENAME_WHITEOUT support").
+
+Signed-off-by: Richard Weinberger <richard@nod.at>
+---
+
+--- a/fs/ubifs/dir.c
++++ b/fs/ubifs/dir.c
+@@ -301,8 +301,8 @@ out_budg:
+ 	return err;
+ }
+ 
+-static int ubifs_tmpfile(struct inode *dir, struct dentry *dentry,
+-			 umode_t mode)
++static int do_tmpfile(struct inode *dir, struct dentry *dentry,
++		      umode_t mode, struct inode **whiteout)
+ {
+ 	struct inode *inode;
+ 	struct ubifs_info *c = dir->i_sb->s_fs_info;
+@@ -336,14 +336,27 @@ static int ubifs_tmpfile(struct inode *d
+ 	}
+ 	ui = ubifs_inode(inode);
+ 
++	if (whiteout) {
++		init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
++		ubifs_assert(inode->i_op == &ubifs_file_inode_operations);
++	}
++
+ 	err = ubifs_init_security(dir, inode, &dentry->d_name);
+ 	if (err)
+ 		goto out_inode;
+ 
+ 	mutex_lock(&ui->ui_mutex);
+ 	insert_inode_hash(inode);
+-	d_tmpfile(dentry, inode);
++
++	if (whiteout) {
++		mark_inode_dirty(inode);
++		drop_nlink(inode);
++		*whiteout = inode;
++	} else {
++		d_tmpfile(dentry, inode);
++	}
+ 	ubifs_assert(ui->dirty);
++
+ 	instantiated = 1;
+ 	mutex_unlock(&ui->ui_mutex);
+ 
+@@ -371,6 +384,12 @@ out_budg:
+ 	return err;
+ }
+ 
++static int ubifs_tmpfile(struct inode *dir, struct dentry *dentry,
++			 umode_t mode)
++{
++	return do_tmpfile(dir, dentry, mode, NULL);
++}
++
+ /**
+  * vfs_dent_type - get VFS directory entry type.
+  * @type: UBIFS directory entry type
+@@ -1003,37 +1022,43 @@ out_budg:
+ }
+ 
+ /**
+- * lock_3_inodes - a wrapper for locking three UBIFS inodes.
++ * lock_4_inodes - a wrapper for locking three UBIFS inodes.
+  * @inode1: first inode
+  * @inode2: second inode
+  * @inode3: third inode
++ * @inode4: fouth inode
+  *
+  * This function is used for 'ubifs_rename()' and @inode1 may be the same as
+- * @inode2 whereas @inode3 may be %NULL.
++ * @inode2 whereas @inode3 and @inode4 may be %NULL.
+  *
+  * We do not implement any tricks to guarantee strict lock ordering, because
+  * VFS has already done it for us on the @i_mutex. So this is just a simple
+  * wrapper function.
+  */
+-static void lock_3_inodes(struct inode *inode1, struct inode *inode2,
+-			  struct inode *inode3)
++static void lock_4_inodes(struct inode *inode1, struct inode *inode2,
++			  struct inode *inode3, struct inode *inode4)
+ {
+ 	mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1);
+ 	if (inode2 != inode1)
+ 		mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2);
+ 	if (inode3)
+ 		mutex_lock_nested(&ubifs_inode(inode3)->ui_mutex, WB_MUTEX_3);
++	if (inode4)
++		mutex_lock_nested(&ubifs_inode(inode4)->ui_mutex, WB_MUTEX_4);
+ }
+ 
+ /**
+- * unlock_3_inodes - a wrapper for unlocking three UBIFS inodes for rename.
++ * unlock_4_inodes - a wrapper for unlocking three UBIFS inodes for rename.
+  * @inode1: first inode
+  * @inode2: second inode
+  * @inode3: third inode
++ * @inode4: fouth inode
+  */
+-static void unlock_3_inodes(struct inode *inode1, struct inode *inode2,
+-			    struct inode *inode3)
++static void unlock_4_inodes(struct inode *inode1, struct inode *inode2,
++			    struct inode *inode3, struct inode *inode4)
+ {
++	if (inode4)
++		mutex_unlock(&ubifs_inode(inode4)->ui_mutex);
+ 	if (inode3)
+ 		mutex_unlock(&ubifs_inode(inode3)->ui_mutex);
+ 	if (inode1 != inode2)
+@@ -1042,12 +1067,15 @@ static void unlock_3_inodes(struct inode
+ }
+ 
+ static int ubifs_rename(struct inode *old_dir, struct dentry *old_dentry,
+-			struct inode *new_dir, struct dentry *new_dentry)
++			struct inode *new_dir, struct dentry *new_dentry,
++			unsigned int flags)
+ {
+ 	struct ubifs_info *c = old_dir->i_sb->s_fs_info;
+ 	struct inode *old_inode = d_inode(old_dentry);
+ 	struct inode *new_inode = d_inode(new_dentry);
++	struct inode *whiteout = NULL;
+ 	struct ubifs_inode *old_inode_ui = ubifs_inode(old_inode);
++	struct ubifs_inode *whiteout_ui = NULL;
+ 	int err, release, sync = 0, move = (new_dir != old_dir);
+ 	int is_dir = S_ISDIR(old_inode->i_mode);
+ 	int unlink = !!new_inode;
+@@ -1069,9 +1097,13 @@ static int ubifs_rename(struct inode *ol
+ 	 * separately.
+ 	 */
+ 
+-	dbg_gen("dent '%pd' ino %lu in dir ino %lu to dent '%pd' in dir ino %lu",
++	dbg_gen("dent '%pd' ino %lu in dir ino %lu to dent '%pd' in dir ino %lu flags 0x%x",
+ 		old_dentry, old_inode->i_ino, old_dir->i_ino,
+-		new_dentry, new_dir->i_ino);
++		new_dentry, new_dir->i_ino, flags);
++
++	if (flags & ~(RENAME_NOREPLACE | RENAME_WHITEOUT))
++		return -EINVAL;
++
+ 	ubifs_assert(mutex_is_locked(&old_dir->i_mutex));
+ 	ubifs_assert(mutex_is_locked(&new_dir->i_mutex));
+ 	if (unlink)
+@@ -1093,7 +1125,32 @@ static int ubifs_rename(struct inode *ol
+ 		return err;
+ 	}
+ 
+-	lock_3_inodes(old_dir, new_dir, new_inode);
++	if (flags & RENAME_WHITEOUT) {
++		union ubifs_dev_desc *dev = NULL;
++
++		dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
++		if (!dev) {
++			ubifs_release_budget(c, &req);
++			ubifs_release_budget(c, &ino_req);
++			return -ENOMEM;
++		}
++
++		err = do_tmpfile(old_dir, old_dentry, S_IFCHR | WHITEOUT_MODE, &whiteout);
++		if (err) {
++			ubifs_release_budget(c, &req);
++			ubifs_release_budget(c, &ino_req);
++			kfree(dev);
++			return err;
++		}
++
++		whiteout->i_state |= I_LINKABLE;
++		whiteout_ui = ubifs_inode(whiteout);
++		whiteout_ui->data = dev;
++		whiteout_ui->data_len = ubifs_encode_dev(dev, MKDEV(0, 0));
++		ubifs_assert(!whiteout_ui->dirty);
++	}
++
++	lock_4_inodes(old_dir, new_dir, new_inode, whiteout);
+ 
+ 	/*
+ 	 * Like most other Unix systems, set the @i_ctime for inodes on a
+@@ -1163,12 +1220,34 @@ static int ubifs_rename(struct inode *ol
+ 		if (unlink && IS_SYNC(new_inode))
+ 			sync = 1;
+ 	}
+-	err = ubifs_jnl_rename(c, old_dir, old_dentry, new_dir, new_dentry,
++
++	if (whiteout) {
++		struct ubifs_budget_req wht_req = { .dirtied_ino = 1,
++				.dirtied_ino_d = \
++				ALIGN(ubifs_inode(whiteout)->data_len, 8) };
++
++		err = ubifs_budget_space(c, &wht_req);
++		if (err) {
++			ubifs_release_budget(c, &req);
++			ubifs_release_budget(c, &ino_req);
++			kfree(whiteout_ui->data);
++			whiteout_ui->data_len = 0;
++			iput(whiteout);
++			return err;
++		}
++
++		inc_nlink(whiteout);
++		mark_inode_dirty(whiteout);
++		whiteout->i_state &= ~I_LINKABLE;
++		iput(whiteout);
++	}
++
++	err = ubifs_jnl_rename(c, old_dir, old_dentry, new_dir, new_dentry, whiteout,
+ 			       sync);
+ 	if (err)
+ 		goto out_cancel;
+ 
+-	unlock_3_inodes(old_dir, new_dir, new_inode);
++	unlock_4_inodes(old_dir, new_dir, new_inode, whiteout);
+ 	ubifs_release_budget(c, &req);
+ 
+ 	mutex_lock(&old_inode_ui->ui_mutex);
+@@ -1201,7 +1280,11 @@ out_cancel:
+ 				inc_nlink(old_dir);
+ 		}
+ 	}
+-	unlock_3_inodes(old_dir, new_dir, new_inode);
++	if (whiteout) {
++		drop_nlink(whiteout);
++		iput(whiteout);
++	}
++	unlock_4_inodes(old_dir, new_dir, new_inode, whiteout);
+ 	ubifs_release_budget(c, &ino_req);
+ 	ubifs_release_budget(c, &req);
+ 	return err;
+@@ -1255,7 +1338,7 @@ const struct inode_operations ubifs_dir_
+ 	.mkdir       = ubifs_mkdir,
+ 	.rmdir       = ubifs_rmdir,
+ 	.mknod       = ubifs_mknod,
+-	.rename      = ubifs_rename,
++	.rename2     = ubifs_rename,
+ 	.setattr     = ubifs_setattr,
+ 	.getattr     = ubifs_getattr,
+ 	.setxattr    = ubifs_setxattr,
+--- a/fs/ubifs/journal.c
++++ b/fs/ubifs/journal.c
+@@ -917,14 +917,15 @@ int ubifs_jnl_delete_inode(struct ubifs_
+  * @sync: non-zero if the write-buffer has to be synchronized
+  *
+  * This function implements the re-name operation which may involve writing up
+- * to 3 inodes and 2 directory entries. It marks the written inodes as clean
++ * to 4 inodes and 2 directory entries. It marks the written inodes as clean
+  * and returns zero on success. In case of failure, a negative error code is
+  * returned.
+  */
+ int ubifs_jnl_rename(struct ubifs_info *c, const struct inode *old_dir,
+ 		     const struct dentry *old_dentry,
+ 		     const struct inode *new_dir,
+-		     const struct dentry *new_dentry, int sync)
++		     const struct dentry *new_dentry,
++		     const struct inode *whiteout, int sync)
+ {
+ 	void *p;
+ 	union ubifs_key key;
+@@ -980,13 +981,19 @@ int ubifs_jnl_rename(struct ubifs_info *
+ 	zero_dent_node_unused(dent);
+ 	ubifs_prep_grp_node(c, dent, dlen1, 0);
+ 
+-	/* Make deletion dent */
+ 	dent2 = (void *)dent + aligned_dlen1;
+ 	dent2->ch.node_type = UBIFS_DENT_NODE;
+ 	dent_key_init_flash(c, &dent2->key, old_dir->i_ino,
+ 			    &old_dentry->d_name);
+-	dent2->inum = 0;
+-	dent2->type = DT_UNKNOWN;
++
++	if (whiteout) {
++		dent2->inum = cpu_to_le64(whiteout->i_ino);
++		dent2->type = get_dent_type(whiteout->i_mode);
++	} else {
++		/* Make deletion dent */
++		dent2->inum = 0;
++		dent2->type = DT_UNKNOWN;
++	}
+ 	dent2->nlen = cpu_to_le16(old_dentry->d_name.len);
+ 	memcpy(dent2->name, old_dentry->d_name.name, old_dentry->d_name.len);
+ 	dent2->name[old_dentry->d_name.len] = '\0';
+@@ -1035,16 +1042,26 @@ int ubifs_jnl_rename(struct ubifs_info *
+ 	if (err)
+ 		goto out_ro;
+ 
+-	err = ubifs_add_dirt(c, lnum, dlen2);
+-	if (err)
+-		goto out_ro;
+-
+-	dent_key_init(c, &key, old_dir->i_ino, &old_dentry->d_name);
+-	err = ubifs_tnc_remove_nm(c, &key, &old_dentry->d_name);
+-	if (err)
+-		goto out_ro;
++	offs += aligned_dlen1;
++	if (whiteout) {
++		dent_key_init(c, &key, old_dir->i_ino, &old_dentry->d_name);
++		err = ubifs_tnc_add_nm(c, &key, lnum, offs, dlen2, &old_dentry->d_name);
++		if (err)
++			goto out_ro;
++
++		ubifs_delete_orphan(c, whiteout->i_ino);
++	} else {
++		err = ubifs_add_dirt(c, lnum, dlen2);
++		if (err)
++			goto out_ro;
++
++		dent_key_init(c, &key, old_dir->i_ino, &old_dentry->d_name);
++		err = ubifs_tnc_remove_nm(c, &key, &old_dentry->d_name);
++		if (err)
++			goto out_ro;
++	}
+ 
+-	offs += aligned_dlen1 + aligned_dlen2;
++	offs += aligned_dlen2;
+ 	if (new_inode) {
+ 		ino_key_init(c, &key, new_inode->i_ino);
+ 		err = ubifs_tnc_add(c, &key, lnum, offs, ilen);
+--- a/fs/ubifs/ubifs.h
++++ b/fs/ubifs/ubifs.h
+@@ -180,6 +180,7 @@ enum {
+ 	WB_MUTEX_1 = 0,
+ 	WB_MUTEX_2 = 1,
+ 	WB_MUTEX_3 = 2,
++	WB_MUTEX_4 = 3,
+ };
+ 
+ /*
+@@ -1546,7 +1547,8 @@ int ubifs_jnl_delete_inode(struct ubifs_
+ int ubifs_jnl_rename(struct ubifs_info *c, const struct inode *old_dir,
+ 		     const struct dentry *old_dentry,
+ 		     const struct inode *new_dir,
+-		     const struct dentry *new_dentry, int sync);
++		     const struct dentry *new_dentry,
++		     const struct inode *whiteout, int sync);
+ int ubifs_jnl_truncate(struct ubifs_info *c, const struct inode *inode,
+ 		       loff_t old_size, loff_t new_size);
+ int ubifs_jnl_delete_xattr(struct ubifs_info *c, const struct inode *host,