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https://github.com/linux-apfs/apfstests.git
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Theodore Ts'o
56ff01f471
The check script requires that it be run as root, so adding individualized checks for this in each teat is not needed. Signed-off-by: Theodore Ts'o <tytso@mit.edu> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dave Chinner <david@fromorbit.com>
102 lines
2.6 KiB
Bash
Executable File
102 lines
2.6 KiB
Bash
Executable File
#! /bin/bash
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# FSQA Test No. 037
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#
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# Verify that replacing a xattr's value is an atomic operation.
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# This is motivated by an issue in btrfs where replacing a xattr's value
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# wasn't an atomic operation, it consisted of removing the old value and
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# then inserting the new value in a btree. This made readers (getxattr
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# and listxattrs) not getting neither the old nor the new value during
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# a short time window.
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#
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# The btrfs issue was fixed by the following linux kernel patch:
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#
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# Btrfs: make xattr replace operations atomic
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#
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#-----------------------------------------------------------------------
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#
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# Copyright (C) 2014 SUSE Linux Products GmbH. All Rights Reserved.
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# Author: Filipe Manana <fdmanana@suse.com>
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it would be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write the Free Software Foundation,
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# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#-----------------------------------------------------------------------
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#
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seq=`basename $0`
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seqres=$RESULT_DIR/$seq
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echo "QA output created by $seq"
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tmp=/tmp/$$
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status=1 # failure is the default!
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trap "_cleanup; exit \$status" 0 1 2 3 15
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_cleanup()
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{
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kill $setter_pid
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rm -f $tmp.*
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}
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# get standard environment, filters and checks
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. ./common/rc
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. ./common/filter
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. ./common/attr
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# real QA test starts here
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_supported_fs generic
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_supported_os Linux
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_require_scratch
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_require_attrs
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rm -f $seqres.full
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xattr_name="user.something"
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xattr_value1="foobar"
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xattr_value2="rabbit_hole"
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set_xattr_loop()
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{
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local name=$1
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local cur_val=$xattr_value1
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while true; do
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$SETFATTR_PROG -n $xattr_name -v $cur_val $SCRATCH_MNT/$name
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if [ "$cur_val" == "$xattr_value1" ]; then
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cur_val=$xattr_value2
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else
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cur_val=$xattr_value1
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fi
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done
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}
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value_filter()
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{
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grep "$xattr_name=" | cut -d '=' -f 2 | \
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sed -e "s/$xattr_value1/GOOD/" -e "s/$xattr_value2/GOOD/"
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}
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_scratch_mkfs >>$seqres.full 2>&1
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_scratch_mount
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test_file="test_xattr_replace"
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touch $SCRATCH_MNT/$test_file
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$SETFATTR_PROG -n $xattr_name -v $xattr_value1 $SCRATCH_MNT/$test_file
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set_xattr_loop $test_file &
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setter_pid=$!
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for ((i = 0; i < 1000; i++)); do
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$GETFATTR_PROG --absolute-names -n $xattr_name \
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$SCRATCH_MNT/$test_file | value_filter
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done
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status=0
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exit
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