tests/generic/719

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0-or-later
# Copyright (c) 2022 Oracle.  All Rights Reserved.
#
# FS QA Test No. 719
#
# Test atomic file replacement when (a) the length is the same; (b) the length
# is different; and (c) someone modifies the original file and we need to
# cancel the update.  The staging file is created empty, which implies that the
# caller wants a full file replacement.

. ./common/preamble
_begin_fstest auto quick fiexchange

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

# Import common functions.
. ./common/filter

_require_xfs_io_command exchangerange
_require_xfs_io_command startupdate '-e'
_require_test

filesnap() {
	echo "$1"
	md5sum $2 | _filter_test_dir
}

mkfile() {
	rm -f $dir/a
	_pwrite_byte 0x58 0 $((blksz * nrblks)) $dir/a >> $seqres.full
	sync
}

dir=$TEST_DIR/test-$seq
mkdir -p $dir
blksz=65536
nrblks=64

# Use the atomic file update staging prototype in xfs_io to update a file.
mkfile
filesnap "before commit" $dir/a

$XFS_IO_PROG \
	-c 'startupdate -e' \
	-c "pwrite -S 0x60 0 $((blksz * nrblks))" \
	-c 'commitupdate -q' \
	"$dir/a" 2>&1 | _filter_xfs_io | _filter_test_dir

filesnap "after commit" $dir/a
echo

# Use the atomic file updates to replace a file with a shorter file.
mkfile
filesnap "before shorten commit" $dir/a

$XFS_IO_PROG \
	-c 'startupdate -e' \
	-c 'pwrite -S 0x60 0 55k' \
	-c 'commitupdate -q' \
	"$dir/a" 2>&1 | _filter_xfs_io | _filter_test_dir

filesnap "after shorten commit" $dir/a
echo

# Use the atomic file updates to replace a file with a longer file.
mkfile
filesnap "before lengthen commit" $dir/a

$XFS_IO_PROG \
	-c 'startupdate -e' \
	-c "pwrite -S 0x60 0 $(( (blksz * nrblks) + 37373 ))" \
	-c 'commitupdate -q' \
	"$dir/a" 2>&1 | _filter_xfs_io | _filter_test_dir

filesnap "after lengthen commit" $dir/a
echo

# Now try the update but with the A file open separately so that we clobber
# mtime and fail the update.
mkfile
filesnap "before fail commit" $dir/a

$XFS_IO_PROG \
	-c "open $dir/a" \
	-c 'startupdate -e ' \
	-c 'pwrite -S 0x58 44k 55k -b 1m' \
	-c 'file 0' \
	-c 'close' \
	-c 'pwrite -S 0x61 22k 11k -b 1m' \
	-c 'commitupdate -q' \
	"$dir/a" 2>&1 | _filter_xfs_io | _filter_test_dir

filesnap "after fail commit" $dir/a
echo

# success, all done
status=0
exit