btrfs: return EPERM upon rmdir on a subvolume

A subvolume cannot be deleted via rmdir, but the error code ENOTEMPTY
is confusing. Return EPERM instead, as this is not permitted.

Signed-off-by: David Sterba <dsterba@suse.cz>

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index d41e467..1c50f7c 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -3200,9 +3200,10 @@ static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
        struct btrfs_trans_handle *trans;
        unsigned long nr = 0;
 
-       if (inode->i_size > BTRFS_EMPTY_DIR_SIZE ||
-           btrfs_ino(inode) == BTRFS_FIRST_FREE_OBJECTID)
+       if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
                return -ENOTEMPTY;
+       if (btrfs_ino(inode) == BTRFS_FIRST_FREE_OBJECTID)
+               return -EPERM;
 
        trans = __unlink_start_trans(dir, dentry);
        if (IS_ERR(trans))