From: Filipe Manana <fdmanana@suse.com>
To: fstests@vger.kernel.org
Cc: linux-btrfs@vger.kernel.org, Filipe Manana <fdmanana@suse.com>
Subject: [PATCH v2] fstests: add generic test to verify xattr replace operations are atomic
Date: Mon, 10 Nov 2014 00:48:21 +0000 [thread overview]
Message-ID: <1415580501-26604-1-git-send-email-fdmanana@suse.com> (raw)
In-Reply-To: <1415392826-11606-1-git-send-email-fdmanana@suse.com>
This test verifies that replacing a xattr's value is an atomic
operation. This is motivated by an issue in btrfs where replacing
a xattr's value wasn't an atomic operation, it consisted of
removing the old value and then inserting the new value in a
btree. This made readers (getxattr and listxattrs) not getting
neither the old nor the new value during a short time window.
Signed-off-by: Filipe Manana <fdmanana@suse.com>
---
V2: Several changes after Dave's review. Renamed test file, added test to the
metadata category and filtered xattr value out of getfattr to include it
in the golden output.
tests/generic/036 | 102 +++++
tests/generic/036.out | 1001 +++++++++++++++++++++++++++++++++++++++++++++++++
tests/generic/group | 1 +
3 files changed, 1104 insertions(+)
create mode 100755 tests/generic/036
create mode 100644 tests/generic/036.out
diff --git a/tests/generic/036 b/tests/generic/036
new file mode 100755
index 0000000..ff5bef7
--- /dev/null
+++ b/tests/generic/036
@@ -0,0 +1,102 @@
+#! /bin/bash
+# FSQA Test No. 036
+#
+# Verify that replacing a xattr's value is an atomic operation.
+# This is motivated by an issue in btrfs where replacing a xattr's value
+# wasn't an atomic operation, it consisted of removing the old value and
+# then inserting the new value in a btree. This made readers (getxattr
+# and listxattrs) not getting neither the old nor the new value during
+# a short time window.
+#
+# The btrfs issue was fixed by the following linux kernel patch:
+#
+# Btrfs: make xattr replace operations atomic
+#
+#-----------------------------------------------------------------------
+#
+# Copyright (C) 2014 SUSE Linux Products GmbH. All Rights Reserved.
+# Author: Filipe Manana <fdmanana@suse.com>
+#
+# 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"
+tmp=/tmp/$$
+status=1 # failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+ kill $setter_pid
+ rm -f $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+. ./common/attr
+
+# real QA test starts here
+_need_to_be_root
+_supported_fs generic
+_supported_os Linux
+_require_scratch
+_require_attrs
+
+rm -f $seqres.full
+
+xattr_name="user.something"
+xattr_value1="foobar"
+xattr_value2="rabbit_hole"
+
+set_xattr_loop()
+{
+ local name=$1
+ local cur_val=$xattr_value1
+ while true; do
+ $SETFATTR_PROG -n $xattr_name -v $cur_val $SCRATCH_MNT/$name
+ if [ "$cur_val" == "$xattr_value1" ]; then
+ cur_val=$xattr_value2
+ else
+ cur_val=$xattr_value1
+ fi
+ done
+}
+
+value_filter()
+{
+ grep "$xattr_name=" | cut -d '=' -f 2 | \
+ sed -e "s/$xattr_value1/GOOD/" -e "s/$xattr_value2/GOOD/"
+}
+
+_scratch_mkfs >>$seqres.full 2>&1
+_scratch_mount
+
+test_file="test_xattr_replace"
+touch $SCRATCH_MNT/$test_file
+$SETFATTR_PROG -n $xattr_name -v $xattr_value1 $SCRATCH_MNT/$test_file
+
+set_xattr_loop $test_file &
+setter_pid=$!
+
+for ((i = 0; i < 1000; i++)); do
+ $GETFATTR_PROG --absolute-names -n $xattr_name \
+ $SCRATCH_MNT/$test_file | value_filter
+done
+
+status=0
+exit
diff --git a/tests/generic/036.out b/tests/generic/036.out
new file mode 100644
index 0000000..c440719
--- /dev/null
+++ b/tests/generic/036.out
@@ -0,0 +1,1001 @@
+QA output created by 036
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diff --git a/tests/generic/group b/tests/generic/group
index 9c82a6f..4b67df7 100644
--- a/tests/generic/group
+++ b/tests/generic/group
@@ -38,6 +38,7 @@
033 auto quick rw
034 auto quick metadata log
035 auto quick
+036 metadata auto quick
053 acl repair auto quick
062 attr udf auto quick
068 other auto freeze dangerous stress
--
1.9.1
prev parent reply other threads:[~2014-11-10 0:49 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-07 20:40 [PATCH] fstests: add generic test to verify xattr replace operations are atomic Filipe Manana
2014-11-09 23:45 ` Dave Chinner
2014-11-10 0:49 ` Filipe David Manana
2014-11-10 1:31 ` Dave Chinner
2014-11-10 11:53 ` Filipe David Manana
2014-11-10 19:47 ` Dave Chinner
2014-11-10 0:48 ` Filipe Manana [this message]
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