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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test No. btrfs/104
#
# Test btrfs quota group consistency operations during snapshot
# delete. Btrfs has had long standing issues with drop snapshot
# failing to properly account for quota groups. This test crafts
# several snapshot trees with shared and exclusive elements. One of
# the trees is removed and then quota group consistency is checked.
#
# This issue is fixed by the following linux kernel patches:
#
# Btrfs: use btrfs_get_fs_root in resolve_indirect_ref
# Btrfs: keep dropped roots in cache until transaciton commit
# btrfs: qgroup: account shared subtree during snapshot delete
#
. ./common/preamble
_begin_fstest auto qgroup
# Import common functions.
. ./common/filter
# real QA test starts here
_supported_fs btrfs
_require_scratch
_require_btrfs_qgroup_report
# Create an fs tree of a given height at a target location. This is
# done by agressively creating inline extents to expand the number of
# nodes required. We also add an traditional extent so that
# drop_snapshot is forced to walk at least one extent that is not
# stored in metadata.
#
# NOTE: The ability to vary tree height for this test is very useful
# for debugging problems with drop_snapshot(). As a result we retain
# that parameter even though the test below always does level 2 trees.
_explode_fs_tree () {
local level=$1;
local loc="$2";
local n;
if [ -z $loc ]; then
echo "specify location for fileset"
exit 1;
fi
case $level in
1)# this always reproduces level 1 trees
n=10;
;;
2)# this always reproduces level 2 trees
n=1500
;;
3)# this always reproduces level 3 trees
n=1000000;
;;
*)
echo "Can't make level $level trees";
exit 1;
;;
esac
mkdir -p $loc
for i in `seq -w 1 $n`; do
$XFS_IO_PROG -f -c "pwrite 0 4095" $loc/file$i > /dev/null 2>&1
done
$XFS_IO_PROG -f -c "pwrite 0 128k" $loc/extentfile > /dev/null 2>&1
}
# Force the default leaf size as the calculations for making our btree
# heights are based on that.
_scratch_mkfs "--nodesize 16384" >> $seqres.full 2>&1
_scratch_mount
# populate the default subvolume and create a snapshot ('snap1')
_explode_fs_tree 1 $SCRATCH_MNT/files
_run_btrfs_util_prog subvolume snapshot $SCRATCH_MNT $SCRATCH_MNT/snap1
# create new btree nodes in this snapshot. They will become shared
# with the next snapshot we create.
_explode_fs_tree 1 $SCRATCH_MNT/snap1/files-snap1
# create our final snapshot ('snap2'), populate it with
# exclusively owned nodes.
#
# As a result of this action, snap2 will get an implied ref to the
# 128K extent created in the default subvolume.
_run_btrfs_util_prog subvolume snapshot $SCRATCH_MNT/snap1 $SCRATCH_MNT/snap2
_explode_fs_tree 1 $SCRATCH_MNT/snap2/files-snap2
# Enable qgroups now that we have our filesystem prepared. This
# will kick off a scan which we will have to wait for.
_run_btrfs_util_prog quota enable $SCRATCH_MNT
_qgroup_rescan $SCRATCH_MNT
# Remount to clear cache, force everything to disk
_scratch_cycle_mount
# Finally, delete snap1 to trigger btrfs_drop_snapshot(). This
# snapshot is most interesting to delete because it will cause some
# nodes to go exclusively owned for snap2, while some will stay shared
# with the default subvolume. That exercises a maximum of the drop
# snapshot/qgroup interactions.
#
# snap2s imlied ref from to the 128K extent in files/ can be lost by
# the root finding code in qgroup accounting due to snap1 no longer
# providing a path to it. This was fixed by the first two patches
# referenced above.
_run_btrfs_util_prog subvolume delete $SCRATCH_MNT/snap1
# "btrfs filesystem sync" will trigger subvolume deletion
_run_btrfs_util_prog filesystem sync $SCRATCH_MNT
# Qgroup will be checked by fstest at _check_scratch_fs()
status=0
exit
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