From: Felix Fietkau 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 --- --- a/fs/jffs2/dir.c +++ b/fs/jffs2/dir.c @@ -756,6 +756,24 @@ 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) @@ -766,7 +784,7 @@ 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 @@ -832,9 +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 */