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Message-Id: <20170104155129.2290-1-roman.penyaev@profitbricks.com>
Date: Wed, 4 Jan 2017 16:51:29 +0100
From: Roman Pen <roman.penyaev@...fitbricks.com>
To: unlisted-recipients:; (no To-header on input)
Cc: Roman Pen <roman.penyaev@...fitbricks.com>,
Theodore Ts'o <tytso@....edu>, linux-ext4@...r.kernel.org,
fstests@...r.kernel.org
Subject: [PATCH 1/1] xfstests: ext4/023: reproduces incorrect right shift (insert range)
Test tries to insert many blocks at the same offset to reproduce
the following layout:
block #0 block #1
|ext0 ext1|ext2 ext3 ...|
^
insert of a new block
Because of an incorrect range first block is never reached,
thus ext1 is untouched, resulting to a hole at a wrong offset:
What we got:
block #0 block #1
|ext0 ext1| ext2 ext3 ...|
^
hole at a wrong offset
What we expect:
block #0 block #1
|ext0 ext1|ext2 ext3 ...|
^
hole at a correct offset
Signed-off-by: Roman Pen <roman.penyaev@...fitbricks.com>
Cc: "Theodore Ts'o <tytso@....edu>"
Cc: linux-ext4@...r.kernel.org
Cc: fstests@...r.kernel.org
---
tests/ext4/023 | 124 +++++++++++++++++++++++++++++++++++++++++++++++++++++
tests/ext4/023.out | 2 +
tests/ext4/group | 1 +
3 files changed, 127 insertions(+)
create mode 100755 tests/ext4/023
create mode 100644 tests/ext4/023.out
diff --git a/tests/ext4/023 b/tests/ext4/023
new file mode 100755
index 000000000000..2ca9d2fcf086
--- /dev/null
+++ b/tests/ext4/023
@@ -0,0 +1,124 @@
+#! /bin/bash
+# FS QA Test 023
+#
+# Regression test which reproduces an incorrect right shift
+# (insert range) for the first extent in a range.
+#
+# Test tries to insert many blocks at the same offset to reproduce
+# the following layout:
+#
+# block #0 block #1
+# |ext0 ext1|ext2 ext3 ...|
+# ^
+# insert of a new block
+#
+# Because of an incorrect range first block is never reached,
+# thus ext1 is untouched, resulting to a hole at a wrong offset:
+#
+# What we got:
+#
+# block #0 block #1
+# |ext0 ext1| ext2 ext3 ...|
+# ^
+# hole at a wrong offset
+#
+# What we expect:
+#
+# block #0 block #1
+# |ext0 ext1|ext2 ext3 ...|
+# ^
+# hole at a correct offset
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2017 Roman Penyaev. 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 $seqres.full
+
+# real QA test starts here
+
+# Modify as appropriate.
+_supported_fs ext4
+_supported_os Linux
+_require_test
+_require_dumpe2fs
+
+pattern=$tmp
+testfile=$TEST_DIR/023.file
+
+blksize=`$DUMPE2FS_PROG -h $TEST_DEV 2>/dev/null | grep "Block size" | \
+ awk '{print $3}'`
+
+# Generate a block with a repeating number represented as 4 bytes decimal.
+function generate_pattern() {
+ blkind=$1
+ printf "%04d" $blkind | awk '{ while (c++ < '$(($blksize/4))') \
+ printf "%s", $0 }' > $pattern
+}
+
+echo -n > $testfile
+$XFS_IO_PROG -c "falloc 0 $(($blksize * 2))" $testfile \
+ >> $seqres.full 2>&1
+
+# First block, has 0001 as a pattern
+generate_pattern 1
+$XFS_IO_PROG -c "pwrite -i $pattern 0 $blksize" $testfile \
+ >> $seqres.full 2>&1
+
+# Second block, has 0002 as a pattern
+generate_pattern 2
+$XFS_IO_PROG -c "pwrite -i $pattern $blksize $blksize" $testfile \
+ >> $seqres.full 2>&1
+
+# Insert 998 blocks after the first block
+for (( block=3; block<=1000; block++ )); do
+ $XFS_IO_PROG -c "finsert $blksize $blksize" $testfile \
+ >> $seqres.full 2>&1
+
+ generate_pattern $block
+ $XFS_IO_PROG -c "pwrite -i $pattern $blksize $blksize" $testfile \
+ >> $seqres.full 2>&1
+done
+
+# Avoid offsets because block size can vary.
+# Expected blocks content is the following:
+# 0001 1000 0999 0998 ... 0002
+hexdump -e '16/1 "%_p" "\n"' $testfile | md5sum
+
+# success, all done
+status=0
+exit
diff --git a/tests/ext4/023.out b/tests/ext4/023.out
new file mode 100644
index 000000000000..383e305d43fa
--- /dev/null
+++ b/tests/ext4/023.out
@@ -0,0 +1,2 @@
+QA output created by 023
+d1c3b6f63c5420ca8248ca380a8c00cb -
diff --git a/tests/ext4/group b/tests/ext4/group
index 53fe03e87083..ace5cf1a3d47 100644
--- a/tests/ext4/group
+++ b/tests/ext4/group
@@ -25,6 +25,7 @@
020 auto quick ioctl rw
021 auto quick
022 auto quick attr dangerous
+023 auto quick
271 auto rw quick
301 aio auto ioctl rw stress
302 aio auto ioctl rw stress
--
2.10.2
--
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