[PATCH 3/6] xfs/531: Fix test to execute in multi-block directory config

[Chandan Babu R <chandanrlinux@gmail.com>]

xfs/531 attempts to create $testfile after reduce_max_iextents error tag is
injected. Creation of $testfile fails when using a multi-block directory test
configuration because,
1. A directory can have a pseudo maximum extent count of 10.
2. In the worst case a directory entry creation operation can consume
   (XFS_DA_NODE_MAXDEPTH + 1 + 1) * (Nr fs blocks in a single directory block)
   extents.
   With 1k fs block size and 4k directory block size, this evaluates to,
   (5 + 1 + 1) * 4
   = 7 * 4
   = 28
   > 10 (Pseudo maximum inode extent count).

This commit fixes the issue by creating $testfile before injecting
reduce_max_iextents error tag.

Reported-by: Darrick J. Wong <djwong@kernel.org>
Suggested-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandanrlinux@gmail.com>
---
 tests/xfs/531     | 11 ++++++++---
 tests/xfs/531.out |  9 ++++++++-
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/tests/xfs/531 b/tests/xfs/531
index caec7848..935c52b0 100755
--- a/tests/xfs/531
+++ b/tests/xfs/531
@@ -49,13 +49,15 @@ nr_blks=30
 
 testfile=$SCRATCH_MNT/testfile
 
-echo "Inject reduce_max_iextents error tag"
-_scratch_inject_error reduce_max_iextents 1
-
 for op in fpunch finsert fcollapse fzero; do
 	echo "* $op regular file"
 
 	echo "Create \$testfile"
+	touch $testfile
+
+	echo "Inject reduce_max_iextents error tag"
+	_scratch_inject_error reduce_max_iextents 1
+
 	$XFS_IO_PROG -f -s \
 		     -c "pwrite -b $((nr_blks * bsize)) 0 $((nr_blks * bsize))" \
 		     $testfile  >> $seqres.full
@@ -75,6 +77,9 @@ for op in fpunch finsert fcollapse fzero; do
 		exit 1
 	fi
 
+	echo "Disable reduce_max_iextents error tag"
+	_scratch_inject_error reduce_max_iextents 0
+
 	rm $testfile
 done
 
diff --git a/tests/xfs/531.out b/tests/xfs/531.out
index f85776c9..6ac90787 100644
--- a/tests/xfs/531.out
+++ b/tests/xfs/531.out
@@ -1,19 +1,26 @@
 QA output created by 531
 Format and mount fs
-Inject reduce_max_iextents error tag
 * fpunch regular file
 Create $testfile
+Inject reduce_max_iextents error tag
 fpunch alternating blocks
 Verify $testfile's extent count
+Disable reduce_max_iextents error tag
 * finsert regular file
 Create $testfile
+Inject reduce_max_iextents error tag
 finsert alternating blocks
 Verify $testfile's extent count
+Disable reduce_max_iextents error tag
 * fcollapse regular file
 Create $testfile
+Inject reduce_max_iextents error tag
 fcollapse alternating blocks
 Verify $testfile's extent count
+Disable reduce_max_iextents error tag
 * fzero regular file
 Create $testfile
+Inject reduce_max_iextents error tag
 fzero alternating blocks
 Verify $testfile's extent count
+Disable reduce_max_iextents error tag
-- 
2.29.2