#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# FS QA Test No. 653
#
# See what happens if we MMAP CoW blocks 2-4 of a page's worth of blocks when
# the second block is a hole.  (MMAP version of generic/218,220)
#
# This test is dependent on the system page size, so we cannot use md5 in
# the golden output; we can only compare to a check file.
#
. ./common/preamble
_begin_fstest auto quick clone prealloc

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

# real QA test starts here
_require_scratch_reflink
_require_xfs_io_command "falloc"

pagesz=$(getconf PAGE_SIZE)
blksz=$((pagesz / 4))

echo "Format and mount"
_scratch_mkfs_blocksized $blksz > $seqres.full 2>&1
_scratch_mount >> $seqres.full 2>&1

testdir=$SCRATCH_MNT/test-$seq
mkdir $testdir

real_blksz=$(_get_file_block_size $testdir)
test $real_blksz != $blksz && _notrun "Failed to format with small blocksize."

echo "Create the original files"
_pwrite_byte 0x61 0 $pagesz $testdir/file1 >> $seqres.full

$XFS_IO_PROG -f -c "truncate $pagesz" $testdir/file2 >> $seqres.full
$XFS_IO_PROG -f -c "truncate $pagesz" $testdir/file2.chk >> $seqres.full

_reflink_range $testdir/file1 $blksz $testdir/file2 $((blksz * 2)) $blksz >> $seqres.full
_pwrite_byte 0x61 $((blksz * 2)) $blksz $testdir/file2.chk >> $seqres.full
_scratch_cycle_mount

echo "Compare files"
cmp -s $testdir/file1 $testdir/file2 && echo "file1 and file2 should not match."
cmp -s $testdir/file2 $testdir/file2.chk || echo "file2 and file2.chk don't match."

echo "CoW and unmount"
$XFS_IO_PROG -f -c "mmap 0 $pagesz" \
    -c "mwrite -S 0x63 $((blksz + 17)) $((blksz * 3 - 34))" $testdir/file2 >> $seqres.full
$XFS_IO_PROG -f -c "mmap 0 $pagesz" \
    -c "mwrite -S 0x63 $((blksz + 17)) $((blksz * 3 - 34))" $testdir/file2.chk >> $seqres.full
_scratch_cycle_mount

echo "Compare files"
cmp -s $testdir/file1 $testdir/file2 && echo "file1 and file2 should not match."
cmp -s $testdir/file2 $testdir/file2.chk || echo "file2 and file2.chk don't match."

# success, all done
status=0
exit