[PATCH v2] fstests: btrfs/179 call sync qgroup counts

[Anand Jain <anand.jain@oracle.com>]

On some systems btrfs/179 fails because the check finds that there is
difference in the qgroup counts.

So as the intention of the test case is to test any hang like situation
during heavy snapshot create/delete operation with quota enabled, so
make sure the qgroup counts are consistent at the end of the test case,
so to make the check happy.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
---
v2: Use subvolume sync at the end of the test case.
    Patch title changed.

 tests/btrfs/179 | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/tests/btrfs/179 b/tests/btrfs/179
index 4a24ea419a7e..8795d59c01f8 100755
--- a/tests/btrfs/179
+++ b/tests/btrfs/179
@@ -109,6 +109,15 @@ wait $snapshot_pid
 kill $delete_pid
 wait $delete_pid
 
+# By the async nature of qgroup tree scan and subvolume delete, the latest
+# qgroup counts at the time of umount might not be upto date, if it isn't
+# then the check will report the difference in count. The difference in
+# qgroup counts are anyway updated in the following mount, so it is not a
+# real issue that this test case is trying to verify. So make sure the
+# qgroup counts are in sync before unmount happens.
+
+$BTRFS_UTIL_PROG subvolume sync $SCRATCH_MNT >> $seqres.full
+
 # success, all done
 echo "Silence is golden"
 
-- 
1.8.3.1