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- From: Felix Fietkau <nbd@nbd.name>
- Subject: 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
- @@ -752,6 +752,24 @@ 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,
- unsigned int flags)
- @@ -762,7 +780,7 @@ static int jffs2_rename (struct inode *o
- uint8_t type;
- uint32_t now;
-
- - if (flags & ~RENAME_NOREPLACE)
- + if (flags & ~(RENAME_NOREPLACE|RENAME_WHITEOUT))
- return -EINVAL;
-
- /* The VFS will check for us and prevent trying to rename a
- @@ -828,9 +846,14 @@ 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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