[PATCH 5/5] xfs/420: only check the extent layout after syncing

[Christoph Hellwig <hch@lst.de>]

This tests validates the correct extent layout for some hairy reflink
related issues.  But until we called sync or fsync we have no gurantee
of any data fork layout, as only writeback moves the extents from the
COW for to the data fork.

Without this we'll see an error if we use COW fork speculative
preallocations for non-overwrites, which is useful to reduce
fragmentation.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 tests/xfs/420 | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tests/xfs/420 b/tests/xfs/420
index a083a12b..aea95c7b 100755
--- a/tests/xfs/420
+++ b/tests/xfs/420
@@ -93,6 +93,8 @@ $XFS_IO_PROG -c "pwrite -S 0x63 $((blksz * 3)) $blksz" $testdir/file2 >> $seqres
 $XFS_IO_PROG -c "pwrite -S 0x63 0 $blksz" $testdir/file3 >> $seqres.full
 $XFS_IO_PROG -c "pwrite -S 0x63 $((blksz * 3)) $blksz" $testdir/file3 >> $seqres.full
 
+sync
+
 $XFS_IO_PROG -c "bmap -ev" -c "bmap -cv" $testdir/file1 >> $seqres.full 2>&1
 $XFS_IO_PROG -c "bmap -ev" -c "bmap -cv" $testdir/file2 >> $seqres.full 2>&1
 $XFS_IO_PROG -c "bmap -ev" -c "bmap -cv" $testdir/file3 >> $seqres.full 2>&1
-- 
2.19.1