4.9-stable review patch.  If anyone has any objections, please let me know.

------------------


From: "Darrick J. Wong" <darrick.w...@oracle.com>

commit 4fd29ec47212c8cbf98916af519019ccc5e58e49 upstream.

Check the return value of xfs_trans_reserve_quota_nblks for errors.

Signed-off-by: Darrick J. Wong <darrick.w...@oracle.com>
Reviewed-by: Dave Chinner <dchin...@redhat.com>
Signed-off-by: Dave Chinner <da...@fromorbit.com>
Cc: Christoph Hellwig <h...@lst.de>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 fs/xfs/libxfs/xfs_bmap.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -4902,8 +4902,11 @@ xfs_bmap_del_extent_delay(
         * sb counters as we might have to borrow some blocks for the
         * indirect block accounting.
         */
-       xfs_trans_reserve_quota_nblks(NULL, ip, -((long)del->br_blockcount), 0,
+       error = xfs_trans_reserve_quota_nblks(NULL, ip,
+                       -((long)del->br_blockcount), 0,
                        isrt ? XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS);
+       if (error)
+               return error;
        ip->i_delayed_blks -= del->br_blockcount;
 
        if (whichfork == XFS_COW_FORK)


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