tests/generic/649

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2021 Oracle.  All Rights Reserved.
#
# FS QA Test No. 649
#
# Regression test for commit:
#
# 72a048c1056a ("xfs: only set IOMAP_F_SHARED when providing a srcmap to a write")
#
# If a user creates a sparse shared region in a file, convinces XFS to create a
# copy-on-write delayed allocation reservation spanning both the shared blocks
# and the holes, and then calls the fallocate unshare command to unshare the
# entire sparse region, XFS incorrectly tells iomap that the delalloc blocks
# for the holes are shared, which causes it to error out while trying to
# unshare a hole.
#
. ./common/preamble
_begin_fstest auto clone unshare

# Override the default cleanup function.
_cleanup()
{
	cd /
	rm -r -f $tmp.* $TEST_DIR/$seq
}

# Import common functions.
. ./common/reflink
. ./common/filter

# real QA test starts here

# Modify as appropriate.
_supported_fs generic
_require_cp_reflink
_require_test_reflink
_require_test_program "punch-alternating"
_require_xfs_io_command "fpunch"	# make sure punch-alt can do its job
_require_xfs_io_command "funshare"
test "$FSTYP" = "xfs" && _require_xfs_io_command "cowextsize"

mkdir $TEST_DIR/$seq
file1=$TEST_DIR/$seq/a
file2=$TEST_DIR/$seq/b

$XFS_IO_PROG -f -c "pwrite -S 0x58 -b 10m 0 10m" $file1 >> $seqres.full

f1sum0="$(md5sum $file1 | _filter_test_dir)"

_cp_reflink $file1 $file2
$here/src/punch-alternating -o 1 $file2

f2sum0="$(md5sum $file2 | _filter_test_dir)"

# set cowextsize to the defaults (128k) to force delalloc cow preallocations
test "$FSTYP" = "xfs" && $XFS_IO_PROG -c 'cowextsize 0' $file2
$XFS_IO_PROG -c "funshare 0 10m" $file2

f1sum1="$(md5sum $file1 | _filter_test_dir)"
f2sum1="$(md5sum $file2 | _filter_test_dir)"

test "${f1sum0}" = "${f1sum1}" || echo "file1 should not have changed"
test "${f2sum0}" = "${f2sum1}" || echo "file2 should not have changed"

_test_cycle_mount

f1sum2="$(md5sum $file1 | _filter_test_dir)"
f2sum2="$(md5sum $file2 | _filter_test_dir)"

test "${f1sum2}" = "${f1sum1}" || echo "file1 should not have changed ondisk"
test "${f2sum2}" = "${f2sum1}" || echo "file2 should not have changed ondisk"

# success, all done
echo Silence is golden
status=0
exit