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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2016, Oracle and/or its affiliates. All Rights Reserved.
#
# FS QA Test No. 308
#
# Test recovery of "lost" CoW blocks:
# - Use the debugger to fake a leftover CoW extent
# - See if mount/umount fixes it
#
. ./common/preamble
_begin_fstest auto quick clone
# Import common functions.
. ./common/filter
. ./common/reflink
# real QA test starts here
_supported_fs xfs
_require_scratch_reflink
echo "Format"
_scratch_mkfs > $seqres.full 2>&1
_scratch_mount >> $seqres.full
is_rmap=$(_xfs_has_feature $SCRATCH_MNT rmapbt -v)
_scratch_xfs_unmount_dirty
_get_agf_data() {
field="$1"
shift
_scratch_xfs_db -c 'agf 1' "$@" -c "p $field" | awk '{print $3}'
}
_set_agf_data() {
field="$1"
value="$2"
shift; shift
_scratch_xfs_db -x -c 'agf 1' "$@" -c "write $field -- $value" >> $seqres.full
}
_get_sb_data() {
_scratch_xfs_get_sb_field "$@"
}
_set_sb_data() {
_scratch_xfs_set_sb_field "$@" >> $seqres.full
}
_filter_leftover() {
grep "^leftover" | sed -e "s/[0-9]\+/NR/g"
}
_dump_status() {
echo "** " "$@"
_scratch_xfs_db -c 'sb 0' -c p
echo "** agf header"
_scratch_xfs_db -c 'agf 1' -c p
echo "** refcntbt"
_scratch_xfs_db -c 'agf 1' -c 'addr refcntroot' -c p
echo "** rmapbt"
test $is_rmap -gt 0 && _scratch_xfs_db -c 'agf 1' -c 'addr rmaproot' -c p
echo "** bnobt"
_scratch_xfs_db -c 'agf 1' -c 'addr bnoroot' -c p
echo "** cntbt"
_scratch_xfs_db -c 'agf 1' -c 'addr cntroot' -c p
}
echo "We need AG1 to have a single free extent"
bno_lvl=$(_get_agf_data level -c 'addr bnoroot')
bno_nr=$(_get_agf_data numrecs -c 'addr bnoroot')
refc_lvl=$(_get_agf_data level -c 'addr refcntroot')
refc_nr=$(_get_agf_data numrecs -c 'addr refcntroot')
test $bno_lvl -eq 0 || echo " AG 1 bnobt must only have one level"
test $bno_nr -eq 1 || echo " AG 1 bnobt must only have one record"
test $refc_lvl -eq 0 || echo " AG 1 refcountbt must only have one level"
test $refc_nr -eq 0 || echo " AG 1 refcountbt must only have one record"
if [ $is_rmap -gt 0 ]; then
rmap_lvl=$(_get_agf_data level -c 'addr rmaproot')
rmap_nr=$(_get_agf_data numrecs -c 'addr rmaproot')
test $rmap_lvl -eq 0 || echo " AG 1 rmapbt must only have one level"
fi
echo "Find our extent and old counter values"
bno=$(_get_agf_data "recs[1].startblock" -c 'addr bnoroot')
len=$(_get_agf_data "recs[1].blockcount" -c 'addr bnoroot')
agf_freeblks=$(_get_agf_data freeblks)
sb_fdblocks=$(_get_sb_data fdblocks)
test $len -ge 200 || echo " AG 1 doesn't have enough free blocks"
# Take the last 100 blocks of the free extent
debris_len=100
debris_bno=$((bno + len - debris_len))
echo "Remove the extent from the freesp btrees"
_set_agf_data "recs[1].blockcount" $((len - debris_len)) -c 'addr bnoroot'
_set_agf_data "recs[1].blockcount" $((len - debris_len)) -c 'addr cntroot'
_set_agf_data longest $((len - debris_len))
_set_agf_data freeblks $((agf_freeblks - debris_len))
_set_sb_data fdblocks $((sb_fdblocks - debris_len))
echo "Add the extent to the refcount btree"
_set_agf_data numrecs 1 -c 'addr refcntroot'
_set_agf_data "recs[1].startblock" $debris_bno -c 'addr refcntroot'
_set_agf_data "recs[1].blockcount" $debris_len -c 'addr refcntroot'
_set_agf_data "recs[1].refcount" 1 -c 'addr refcntroot'
_set_agf_data "recs[1].cowflag" 1 -c 'addr refcntroot'
if [ $is_rmap -gt 0 ]; then
rmap_nr=$((rmap_nr + 1))
_set_agf_data numrecs $rmap_nr -c 'addr rmaproot'
_set_agf_data "recs[$rmap_nr].startblock" $debris_bno -c 'addr rmaproot'
_set_agf_data "recs[$rmap_nr].blockcount" $debris_len -c 'addr rmaproot'
_set_agf_data "recs[$rmap_nr].owner" -9 -c 'addr rmaproot'
_set_agf_data "recs[$rmap_nr].offset" 0 -c 'addr rmaproot'
fi
_dump_status "broken fs config" >> $seqres.full
echo "Look for leftover warning in xfs_repair"
_scratch_xfs_repair -n 2>&1 | _filter_leftover
echo "Mount filesystem"
_scratch_mount
_scratch_unmount
_dump_status "supposedly fixed fs config" >> $seqres.full
echo "Look for no more leftover warning in xfs_check"
_scratch_xfs_check | _filter_leftover
echo "Look for no more leftover warning in xfs_repair"
_scratch_xfs_repair -n 2>&1 | _filter_leftover
# success, all done
status=0
exit
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