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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2023 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test 303
#
# A regression test to make sure snapshot creation won't cause transaction
# abort if there is already an existing qgroup.
#
. ./common/preamble
_begin_fstest auto quick snapshot subvol qgroup
. ./common/filter
_supported_fs btrfs
_require_scratch
_fixed_by_kernel_commit xxxxxxxxxxxx \
"btrfs: do not abort transaction if there is already an existing qgroup"
_scratch_mkfs >> $seqres.full 2>&1 || _fail "mkfs failed"
_scratch_mount
# Create the first subvolume and get its id.
# This subvolume id should not change no matter if there is an existing
# qgroup for it.
$BTRFS_UTIL_PROG subvolume create "$SCRATCH_MNT/subvol" >> $seqres.full
$BTRFS_UTIL_PROG subvolume snapshot "$SCRATCH_MNT/subvol" \
"$SCRATCH_MNT/snapshot">> $seqres.full
init_subvolid=$(_btrfs_get_subvolid "$SCRATCH_MNT" "snapshot")
if [ -z "$init_subvolid" ]; then
_fail "Unable to get the subvolid of the first snapshot"
fi
echo "Subvolumeid: ${init_subvolid}" >> $seqres.full
_scratch_unmount
# Re-create the fs, as btrfs won't reuse the subvolume id.
_scratch_mkfs >> $seqres.full 2>&1 || _fail "2nd mkfs failed"
_scratch_mount
$BTRFS_UTIL_PROG quota enable "$SCRATCH_MNT" >> $seqres.full
$BTRFS_UTIL_PROG quota rescan -w "$SCRATCH_MNT" >> $seqres.full
# Create a qgroup for the first subvolume, this would make the later
# subvolume creation to find an existing qgroup, and abort transaction.
$BTRFS_UTIL_PROG qgroup create 0/"$init_subvolid" "$SCRATCH_MNT" >> $seqres.full
# Now create the first snapshot, which should have the same subvolid no matter
# if the quota is enabled.
$BTRFS_UTIL_PROG subvolume create "$SCRATCH_MNT/subvol" >> $seqres.full
$BTRFS_UTIL_PROG subvolume snapshot "$SCRATCH_MNT/subvol" \
"$SCRATCH_MNT/snapshot" >> $seqres.full
# Either the snapshot create failed and transaction is aborted thus no
# snapshot here, or we should be able to create the snapshot.
new_subvolid=$(_btrfs_get_subvolid "$SCRATCH_MNT" "snapshot")
echo "Subvolumeid: ${new_subvolid}" >> $seqres.full
if [ -z "$new_subvolid" ]; then
_fail "Unable to get the subvolid of the first snapshot"
fi
# Make sure the subvolumeid for the first snapshot didn't change.
if [ "$new_subvolid" -ne "$init_subvolid" ]; then
_fail "Subvolumeid for the first snapshot changed, has ${new_subvolid} expect ${init_subvolid}"
fi
echo "Silence is golden"
# success, all done
status=0
exit
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