btrfs: do not BUG_ON() on failure to update inode when setting xattr

We are doing a BUG_ON() if we fail to update an inode after setting (or
clearing) a xattr, but there's really no reason to not instead simply
abort the transaction and return the error to the caller. This should be
a rare error because we have previously reserved enough metadata space to
update the inode and the delayed inode should have already been setup, so
an -ENOSPC or -ENOMEM, which are the possible errors, are very unlikely to
happen.

So replace the BUG_ON()s with a transaction abort.

CC: stable@vger.kernel.org # 4.9+
Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/xattr.c b/fs/btrfs/xattr.c
index 9632d0f..367bb87 100644 (file)
--- a/fs/btrfs/xattr.c
+++ b/fs/btrfs/xattr.c
@@ -262,7 +262,8 @@ int btrfs_setxattr_trans(struct inode *inode, const char *name,
        inode_inc_iversion(inode);
        inode->i_ctime = current_time(inode);
        ret = btrfs_update_inode(trans, root, BTRFS_I(inode));
-       BUG_ON(ret);
+       if (ret)
+               btrfs_abort_transaction(trans, ret);
 out:
        if (start_trans)
                btrfs_end_transaction(trans);
@@ -416,7 +417,8 @@ static int btrfs_xattr_handler_set_prop(const struct xattr_handler *handler,
                inode_inc_iversion(inode);
                inode->i_ctime = current_time(inode);
                ret = btrfs_update_inode(trans, root, BTRFS_I(inode));
-               BUG_ON(ret);
+               if (ret)
+                       btrfs_abort_transaction(trans, ret);
        }
 
        btrfs_end_transaction(trans);