[PATCH] fstests: generic: Check if cycle mount and sleep can affect fiemap result

* [PATCH] fstests: generic: Check if cycle mount and sleep can affect fiemap result
@ 2017-04-03  7:09 ` Qu Wenruo
  0 siblings, 0 replies; 17+ messages in thread
From: Qu Wenruo @ 2017-04-03  7:09 UTC (permalink / raw)
  To: linux-btrfs, fstests

As long as we don't modify the on-disk data, fiemap result should always
be constant.

Operation like cycle mount and sleep should not affect fiemap result.
While unfortunately, btrfs doesn't follow that behavior.

Btrfs fiemap sometimes return merged result, while after cycle mount, it
returns split result. Furthermore after a snap, btrfs returns merged
result again.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
---
 tests/generic/422     | 127 ++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/generic/422.out |   2 +
 tests/generic/group   |   1 +
 3 files changed, 130 insertions(+)
 create mode 100755 tests/generic/422
 create mode 100644 tests/generic/422.out

diff --git a/tests/generic/422 b/tests/generic/422
new file mode 100755
index 0000000..4ca4476
--- /dev/null
+++ b/tests/generic/422
@@ -0,0 +1,127 @@
+#! /bin/bash
+# FS QA Test 422
+#
+# Test if a file system returns constant fiemap result after remount and
+# fiemap.
+# Unfortunately, btrfs doesn't follow this behavior.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2017 Fujitsu.  All Rights Reserved.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it would be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write the Free Software Foundation,
+# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#-----------------------------------------------------------------------
+#
+
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1	# failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+	cd /
+	rm -f $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# real QA test starts here
+
+# Modify as appropriate.
+_supported_fs generic
+_supported_os IRIX Linux
+_require_scratch
+
+block_size=$((64 * 1024))
+block_count=32
+dst=$SCRATCH_MNT/file
+sleeptime=3
+
+# It's almost 100% for btrfs to trigger inconstant fiemap result 
+# just in case
+runtime=$((2 * $LOAD_FACTOR))
+
+# record fiemap as checkpoint, and output the hash of fiemap result
+# to stdout
+fiemap_checkpoint()
+{
+	local number=$1
+	local message=$2
+
+	echo "=== $message ===" >> $seqres.full
+	$XFS_IO_PROG -c "fiemap -v" $dst > ${tmp}.cp$number
+	cat ${tmp}.cp${number} >> $seqres.full
+
+	md5sum ${tmp}.cp${number} | cut -d ' ' -f 1
+}
+
+do_test()
+{
+	local number=$1
+
+	# Use 16 times of file size to ensure we have enough space
+	_scratch_mkfs_sized $((16 * $block_size * $block_count)) \
+		> /dev/null 2>&1
+	_scratch_mount 
+
+	echo "====== Loop $number ======" >> $seqres.full
+	touch $dst
+	# Xfsprogs 4.9.0 still has a bug that xfs_io "open" with O_SYNC command
+	# doesn't work well with "pwrite", although it gets fixed in v4.10.0,
+	# use dd here to avoid it won't hurt for non-xfs developers
+	dd if=/dev/zero of=$dst bs=$block_size count=$block_count oflag=dsync \
+		status=none 2>&1
+
+	hash1=$(fiemap_checkpoint 1 "Fiemap just after dsync write")
+
+	# Sleep should not modify fiemap result
+	sleep $sleeptime
+
+	hash2=$(fiemap_checkpoint 2 "Fiemap after dsync write and sleep")
+
+	# cycle mount should not modify fiemap result
+	_scratch_cycle_mount
+
+	hash3=$(fiemap_checkpoint 3 "Fiemap after cycle mount")
+
+	# Sleep should not modify fiemap result
+	sleep $sleeptime
+
+	hash4=$(fiemap_checkpoint 4 "Fiemap after cycle mount and sleep")
+
+	_scratch_unmount
+
+	if [ $hash1 != $hash2 -o $hash2 != $hash3 -o $hash3 != $hash4 ]; then
+		echo "Inconstant fiemap result detected"
+	fi
+	echo >> $seqres.full
+}
+
+for i in $(seq 1 $runtime); do
+	do_test $i
+done
+
+echo "Silence is golden"
+# success, all done
+status=0
+exit
diff --git a/tests/generic/422.out b/tests/generic/422.out
new file mode 100644
index 0000000..f70693f
--- /dev/null
+++ b/tests/generic/422.out
@@ -0,0 +1,2 @@
+QA output created by 422
+Silence is golden
diff --git a/tests/generic/group b/tests/generic/group
index 3c7c5e4..86d2325 100644
--- a/tests/generic/group
+++ b/tests/generic/group
@@ -424,3 +424,4 @@
 419 auto quick encrypt
 420 auto quick punch
 421 auto quick encrypt dangerous
+422 auto
-- 
2.9.3




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