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-rw-r--r--target/linux/generic/pending-4.4/052-02-ubifs-Implement-RENAME_WHITEOUT.patch343
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,