linux-kernel - [PATCH 5.17 030/140] btrfs: do not BUG_ON() on failure to update inode when setting xattr

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Date:   Tue, 10 May 2022 15:07:00 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Qu Wenruo <wqu@...e.com>,
        Anand Jain <anand.jain@...cle.com>,
        Filipe Manana <fdmanana@...e.com>,
        David Sterba <dsterba@...e.com>
Subject: [PATCH 5.17 030/140] btrfs: do not BUG_ON() on failure to update inode when setting xattr

From: Filipe Manana <fdmanana@...e.com>

commit 193b4e83986d7ee6caa8ceefb5ee9f58240fbee0 upstream.

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@...r.kernel.org # 4.9+
Reviewed-by: Qu Wenruo <wqu@...e.com>
Reviewed-by: Anand Jain <anand.jain@...cle.com>
Signed-off-by: Filipe Manana <fdmanana@...e.com>
Reviewed-by: David Sterba <dsterba@...e.com>
Signed-off-by: David Sterba <dsterba@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/btrfs/xattr.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/fs/btrfs/xattr.c
+++ b/fs/btrfs/xattr.c
@@ -262,7 +262,8 @@ int btrfs_setxattr_trans(struct inode *i
 	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(
 		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);