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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2014 SUSE Linux Products GmbH. All Rights Reserved.
#
# FSQA Test No. 078
#
# Regression test for a btrfs issue where creation of readonly snapshots caused
# the filesystem to get into an inconsistent state.
#
# This regression was introduced in the 3.17 kernel and fixed by reverting the
# following linux kernel commit:
#
# Btrfs: race free update of commit root for ro snapshots
# 9c3b306e1c9e6be4be09e99a8fe2227d1005effc
#
. ./common/preamble
_begin_fstest auto snapshot
tmp=`mktemp -d`
# Override the default cleanup function.
_cleanup()
{
rm -fr $tmp
}
# Import common functions.
. ./common/filter
# real QA test starts here
_supported_fs btrfs
_require_scratch
workout()
{
ops=$1
procs=$2
num_snapshots=$3
_scratch_mkfs >> $seqres.full 2>&1
_scratch_mount
snapshot_cmd="$BTRFS_UTIL_PROG subvolume snapshot -r $SCRATCH_MNT"
snapshot_cmd="$snapshot_cmd $SCRATCH_MNT/snap_\`date +'%H_%M_%S_%N'\`"
run_check $FSSTRESS_PROG -p $procs \
-x "$snapshot_cmd" -X $num_snapshots -d $SCRATCH_MNT -n $ops
}
ops=8000
procs=4
snapshots=100
workout $ops $procs $snapshots
# The fstests framework runs a file system check against the scratch device
# automatically when a test case finishes (if the test calls _require_scratch).
# That filesystem check (btrfsck, btrfs.fsck) failed reporting several fs
# inconsistencies. Therefore there's no need to call _check_scratch_fs here.
echo "Silence is golden"
status=0
exit
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