btrfs: call fsnotify_rmdir() hook

This will allow generating fsnotify delete events after the
fsnotify_nameremove() hook is removed from d_delete().

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Acked-by: David Sterba <dsterba@suse.com>
Signed-off-by: Jan Kara <jack@suse.cz>

fs/btrfs/ioctl.c

@@ -2930,8 +2930,10 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file,
 	inode_lock(inode);
 	err = btrfs_delete_subvolume(dir, dentry);
 	inode_unlock(inode);
-	if (!err)
+	if (!err) {
+		fsnotify_rmdir(dir, dentry);
 		d_delete(dentry);
+	}
 
 out_dput:
 	dput(dentry);