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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2014 Red Hat, Inc. All Rights Reserved.
#
# FS QA Test No. 002
#
# Test that garbage in old v4 superblocks doesn't trip verifiers during growfs
#
# Older kernels sometimes left garbage in the unused portions
# of the superblock during growfs; with the new verifiers this initially
# caused failures during a subsequent growfs; see
# 10e6e65 xfs: be more forgiving of a v4 secondary sb w/ junk in v5 fields
# for further explanation. (NB: while the commit log was good, the
# patch had a bug which was subsequently fixed)
#
. ./common/preamble
_begin_fstest auto quick growfs
# Import common functions.
. ./common/filter
# Modify as appropriate.
_supported_fs xfs
_require_scratch_nocheck
_require_no_large_scratch_dev
_require_xfs_nocrc
_scratch_mkfs_xfs -m crc=0 -d size=128m >> $seqres.full 2>&1 || _fail "mkfs failed"
# Scribble past a couple V4 secondary superblocks to populate sb_crc
# (We can't write to the structure member because it doesn't exist
# on a v4 superblock, so we use the data type & "write fill")
_scratch_xfs_db -x -c "sb 1" -c "type data" -c "write fill 0xff 224 4"
_scratch_xfs_db -x -c "sb 2" -c "type data" -c "write fill 0xff 224 4"
_scratch_mount
# This should pass
$XFS_GROWFS_PROG $SCRATCH_MNT >> $seqres.full 2>&1 || _fail "growfs failed"
# success, all done
status=0
exit
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