xfs: handle racy AIO in xfs_reflink_end_cow

If we got two AIO writes into a COW area the second one might not have any
COW extents left to convert.  Handle that case gracefully instead of
triggering an assert or accessing beyond the bounds of the extent list.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index 3246815c24d659d83da380c5cce04dd8ee40a101..37e603bf159137dfd38a1210b5d0bb31e5f4829f 100644 (file)
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -736,7 +736,13 @@ xfs_reflink_end_cow(
        /* If there is a hole at end_fsb - 1 go to the previous extent */
        if (!xfs_iext_lookup_extent(ip, ifp, end_fsb - 1, &idx, &got) ||
            got.br_startoff > end_fsb) {
-               ASSERT(idx > 0);
+               /*
+                * In case of racing, overlapping AIO writes no COW extents
+                * might be left by the time I/O completes for the loser of
+                * the race.  In that case we are done.
+                */
+               if (idx <= 0)
+                       goto out_cancel;
                xfs_iext_get_extent(ifp, --idx, &got);
        }
 
@@ -809,6 +815,7 @@ xfs_reflink_end_cow(
 
 out_defer:
        xfs_defer_cancel(&dfops);
+out_cancel:
        xfs_trans_cancel(tp);
        xfs_iunlock(ip, XFS_ILOCK_EXCL);
 out: