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- From: Felix Fietkau <nbd@nbd.name>
- Date: Fri, 10 Apr 2015 13:35:29 +0200
- Subject: [PATCH] jffs2: use .rename2 and add RENAME_WHITEOUT support
- It is required for renames on overlayfs
- Signed-off-by: Felix Fietkau <nbd@nbd.name>
- ---
- --- a/fs/jffs2/dir.c
- +++ b/fs/jffs2/dir.c
- @@ -35,7 +35,7 @@ static int jffs2_mkdir (struct inode *,s
- static int jffs2_rmdir (struct inode *,struct dentry *);
- static int jffs2_mknod (struct inode *,struct dentry *,umode_t,dev_t);
- static int jffs2_rename (struct inode *, struct dentry *,
- - struct inode *, struct dentry *);
- + struct inode *, struct dentry *, unsigned int);
-
- const struct file_operations jffs2_dir_operations =
- {
- @@ -57,7 +57,7 @@ const struct inode_operations jffs2_dir_
- .mkdir = jffs2_mkdir,
- .rmdir = jffs2_rmdir,
- .mknod = jffs2_mknod,
- - .rename = jffs2_rename,
- + .rename2 = jffs2_rename,
- .get_acl = jffs2_get_acl,
- .set_acl = jffs2_set_acl,
- .setattr = jffs2_setattr,
- @@ -756,8 +756,27 @@ static int jffs2_mknod (struct inode *di
- return ret;
- }
-
- +static int jffs2_whiteout(struct inode *old_dir, struct dentry *old_dentry)
- +{
- + struct dentry *wh;
- + int err;
- +
- + wh = d_alloc(old_dentry->d_parent, &old_dentry->d_name);
- + if (!wh)
- + return -ENOMEM;
- +
- + err = jffs2_mknod(old_dir, wh, S_IFCHR | WHITEOUT_MODE,
- + WHITEOUT_DEV);
- + if (err)
- + return err;
- +
- + d_rehash(wh);
- + return 0;
- +}
- +
- static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
- - struct inode *new_dir_i, struct dentry *new_dentry)
- + struct inode *new_dir_i, struct dentry *new_dentry,
- + unsigned int flags)
- {
- int ret;
- struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
- @@ -765,6 +784,9 @@ static int jffs2_rename (struct inode *o
- uint8_t type;
- uint32_t now;
-
- + if (flags & ~RENAME_WHITEOUT)
- + return -EINVAL;
- +
- /* The VFS will check for us and prevent trying to rename a
- * file over a directory and vice versa, but if it's a directory,
- * the VFS can't check whether the victim is empty. The filesystem
- @@ -828,9 +850,14 @@ static int jffs2_rename (struct inode *o
- if (d_is_dir(old_dentry) && !victim_f)
- inc_nlink(new_dir_i);
-
- - /* Unlink the original */
- - ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
- - old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
- + if (flags & RENAME_WHITEOUT)
- + /* Replace with whiteout */
- + ret = jffs2_whiteout(old_dir_i, old_dentry);
- + else
- + /* Unlink the original */
- + ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
- + old_dentry->d_name.name,
- + old_dentry->d_name.len, NULL, now);
-
- /* We don't touch inode->i_nlink */
-
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