@@ -767,7 +767,13 @@ xfs_reflink_end_cow(
/* If there is a hole at end_fsb - 1 go to the previous extent */
if (eof || 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_bmbt_get_all(xfs_iext_get_ext(ifp, --idx), &got);
}
@@ -841,6 +847,7 @@ xfs_reflink_end_cow(
out_defer:
xfs_defer_cancel(&dfops);
+out_cancel:
xfs_trans_cancel(tp);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
out: