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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# FS QA Test No. 669
#
# Ensuring that copy on write in mmap mode works when the CoW
# range originally covers multiple extents, mixed with reflinked, unwritten,
# hole, regular and delalloc blocks.
# - Create a file with the following repeating sequence of blocks:
# 1. reflinked
# 2. unwritten
# 3. hole
# 4. regular block
# 5. delalloc
# - mmap CoW across the halfway mark, starting with the unwritten extent.
# - Check that the files are now different where we say they're different.
#
. ./common/preamble
_begin_fstest auto quick clone punch prealloc
# Import common functions.
. ./common/filter
. ./common/reflink
# real QA test starts here
_require_scratch_reflink
_require_scratch_delalloc
_require_xfs_io_command "falloc"
_require_xfs_io_command "fpunch"
echo "Format and mount"
_scratch_mkfs > $seqres.full 2>&1
_scratch_mount >> $seqres.full 2>&1
testdir=$SCRATCH_MNT/test-$seq
mkdir $testdir
echo "Create the original files"
blksz=65536
nr=64
filesize=$((blksz * nr))
_sweave_reflink_rainbow $blksz $nr $testdir/file1 $testdir/file3 >> $seqres.full
_scratch_cycle_mount
echo "Compare files"
md5sum $testdir/file1 | _filter_scratch
md5sum $testdir/file3 | _filter_scratch
md5sum $testdir/file1.chk | _filter_scratch
echo "mmap CoW across the transition"
cowoff=$((filesize / 4))
cowsz=$((filesize / 2))
_sweave_reflink_rainbow_delalloc $blksz $nr $testdir/file1 >> $seqres.full
# now cow
mmapsz=$((cowoff + cowsz))
_mwrite_byte 0x63 $cowoff $cowsz $mmapsz $testdir/file1 >> $seqres.full
_mwrite_byte 0x63 $cowoff $cowsz $mmapsz $testdir/file1.chk >> $seqres.full
_scratch_cycle_mount
echo "Compare files"
md5sum $testdir/file1 | _filter_scratch
md5sum $testdir/file3 | _filter_scratch
md5sum $testdir/file1.chk | _filter_scratch
# success, all done
status=0
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