mirror of
https://github.com/linux-apfs/apfstests.git
synced 2026-05-01 15:01:44 -07:00
Josef Bacik
17c22e556f
I discovered a problem in btrfs where we'd end up pointing at a block we hadn't written out yet. This is triggered by a race when two different files on two different subvolumes fsync. This test exercises this path with dm-log-writes, and then replays the log at every FUA to verify the file system is still mountable and the log is replayable. This test is to verify the fix btrfs: fix incorrect updating of log root tree actually fixed the problem. Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Eryu Guan <guaneryu@gmail.com>
111 lines
2.4 KiB
Bash
Executable File
111 lines
2.4 KiB
Bash
Executable File
#! /bin/bash
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# SPDX-License-Identifier: GPL-2.0
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# Copyright (c) 2019 Facebook. All Rights Reserved.
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#
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# FS QA Test 196
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#
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# Test multi subvolume fsync to test a bug where we'd end up pointing at a block
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# we haven't written. This was fixed by the patch
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#
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# btrfs: fix incorrect updating of log root tree
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#
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# Will do log replay and check the filesystem.
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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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here=`pwd`
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tmp=/tmp/$$
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fio_config=$tmp.fio
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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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cd /
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_log_writes_cleanup &> /dev/null
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_dmthin_cleanup
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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/dmthin
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. ./common/dmlogwrites
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# remove previous $seqres.full before test
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rm -f $seqres.full
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# real QA test starts here
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# Modify as appropriate.
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_supported_fs btrfs
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_supported_os Linux
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# Use thin device as replay device, which requires $SCRATCH_DEV
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_require_scratch_nocheck
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# and we need extra device as log device
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_require_log_writes
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_require_dm_target thin-pool
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cat >$fio_config <<EOF
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[global]
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readwrite=write
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fallocate=none
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bs=4k
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fsync=1
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size=128k
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EOF
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for i in $(seq 0 49); do
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echo "[foo$i]" >> $fio_config
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echo "filename=$SCRATCH_MNT/$i/file" >> $fio_config
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done
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_require_fio $fio_config
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cat $fio_config >> $seqres.full
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# Use a thin device to provide deterministic discard behavior. Discards are used
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# by the log replay tool for fast zeroing to prevent out-of-order replay issues.
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_dmthin_init
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_log_writes_init $DMTHIN_VOL_DEV
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_log_writes_mkfs >> $seqres.full 2>&1
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_log_writes_mark mkfs
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_log_writes_mount
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# First create all the subvolumes
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for i in $(seq 0 49); do
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$BTRFS_UTIL_PROG subvolume create "$SCRATCH_MNT/$i" > /dev/null
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done
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$FIO_PROG $fio_config > /dev/null 2>&1
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_log_writes_unmount
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_log_writes_remove
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prev=$(_log_writes_mark_to_entry_number mkfs)
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[ -z "$prev" ] && _fail "failed to locate entry mark 'mkfs'"
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cur=$(_log_writes_find_next_fua $prev)
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[ -z "$cur" ] && _fail "failed to locate next FUA write"
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while [ ! -z "$cur" ]; do
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_log_writes_replay_log_range $cur $DMTHIN_VOL_DEV >> $seqres.full
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# We need to mount the fs because btrfsck won't bother checking the log.
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_dmthin_mount
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_dmthin_check_fs
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prev=$cur
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cur=$(_log_writes_find_next_fua $(($cur + 1)))
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[ -z "$cur" ] && break
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done
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echo "Silence is golden"
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# success, all done
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status=0
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exit
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