#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2017, Oracle and/or its affiliates.  All Rights Reserved.
#
# FS QA Test No. 436
#
# Ensure that we don't leak inodes when CoW recovery fails.
#
# Use xfs_fsr to inject bmap redo items in the log for a linked file and
# an unlinked file; and then corrupt the refcount btree to ensure that
# the CoW garbage collection (and therefore the mount) fail.
#
# On a subsequent mount attempt, we should be able to replay the bmap
# items for the linked and unlinked files without prematurely truncating
# the unlinked inode and without leaking the linked inode, and we should
# be able to release all the inodes when we're aborting the mount.
#
seq=`basename "$0"`
seqres="$RESULT_DIR/$seq"
echo "QA output created by $seq"

here=`pwd`
tmp=/tmp/$$
status=1    # failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15

_cleanup()
{
	cd /
	rm -rf "$tmp".*
}

# get standard environment, filters and checks
. ./common/rc
. ./common/filter
. ./common/attr
. ./common/reflink
. ./common/inject
. ./common/module

# real QA test starts here
_supported_fs xfs
_require_loadable_fs_module "xfs"
_require_scratch_reflink
_require_cp_reflink
_require_command "$XFS_FSR_PROG" "xfs_fsr"
_require_xfs_io_error_injection "bmap_finish_one"
_require_xfs_scratch_rmapbt

rm -f "$seqres.full"

echo "Format and mount"
_scratch_mkfs > "$seqres.full" 2>&1
_scratch_mount -o noquota >> "$seqres.full" 2>&1

testdir="$SCRATCH_MNT/test-$seq"
blksz=65536
blks=3
mkdir "$testdir"

echo "Create a many-block file"
_pwrite_byte 0x62 0 $((blksz * blks)) $testdir/file1 >> $seqres.full
_pwrite_byte 0x63 0 $blksz $testdir/file2 >> $seqres.full
_reflink_range $testdir/file2 0 $testdir/file1 $blksz $blksz >> $seqres.full
_scratch_cycle_mount noquota

echo "Inject error"
_scratch_inject_error "bmap_finish_one"

echo "Defrag the file"
$XFS_FSR_PROG -v -d $testdir/file1 >> $seqres.full 2>&1

echo "FS should be shut down, touch will fail"
touch $SCRATCH_MNT/badfs 2>&1 | _filter_scratch

echo "Remount to replay log" | tee /dev/ttyprintk
_scratch_unmount
_scratch_dump_log >> $seqres.full
_scratch_xfs_db -x -c 'agf 0' -c 'addr refcntroot' -c 'fuzz -d recs[1].startblock ones' >> $seqres.full
_scratch_xfs_db -x -c 'agf 0' -c 'addr refcntroot' -c p >> $seqres.full
_try_scratch_mount -o noquota >> $seqres.full 2>&1
_scratch_unmount 2> /dev/null
rm -f ${RESULT_DIR}/require_scratch

echo "See if we leak"
_reload_fs_module "xfs"

# success, all done
status=0
exit