#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2014 Red Hat, Inc.  All Rights Reserved.
#
# FS QA Test No. generic/029
#
# Test mapped writes against truncate down/up to ensure we get the data
# correctly written. This can expose data corruption bugs on filesystems where
# the block size is smaller than the page size.
#
seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"

here=`pwd`
tmp=/tmp/$$
status=1	# failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15

_cleanup()
{
    cd /
    rm -f $tmp.*
}

# get standard environment, filters and checks
. ./common/rc
. ./common/filter

# real QA test starts here

# Modify as appropriate.
_supported_fs generic
_require_scratch

testfile=$SCRATCH_MNT/testfile

_scratch_mkfs > /dev/null 2>&1
_scratch_mount

# first case is just truncate down/truncate up to check that the mapped
# write after the truncate up is correctly handled.
$XFS_IO_PROG -t -f \
-c "truncate 5120"              `# truncate     |                        |` \
-c "pwrite -S 0x58 0 5120"      `# write        |XXXXXXXXXXXXXXXXXXXXXXXX|` \
-c "mmap -rw 0 5120"            `# mmap         |                        |` \
-c "mwrite -S 0x5a 2048 3072"   `# mwrite       |          ZZZZZZZZZZZZZZ|` \
-c "truncate 2048"              `# truncate dn  |         |` \
-c "truncate 5120"              `# truncate up  |                        |` \
-c "mwrite -S 0x59 2048 3072"   `# mwrite       |          YYYYYYYYYYYYYY|` \
-c "close"      \
$testfile | _filter_xfs_io

echo "==== Pre-Remount ==="
hexdump -C $testfile
_scratch_cycle_mount
echo "==== Post-Remount =="
hexdump -C $testfile

rm -f $testfile
sync

# second case is to do a mwrite between the truncate to a block on the
# same page we are truncating within the EOF. This checks that a mapped
# write between truncate down and truncate up a further mapped
# write to the same page into the new space doesn't result in data being lost.
$XFS_IO_PROG -t -f \
-c "truncate 5120"              `# truncate     |                        |` \
-c "pwrite -S 0x58 0 5120"      `# write        |XXXXXXXXXXXXXXXXXXXXXXXX|` \
-c "mmap -rw 0 5120"            `# mmap         |                        |` \
-c "mwrite -S 0x5a 2048 3072"   `# mwrite       |          ZZZZZZZZZZZZZZ|` \
-c "truncate 2048"              `# truncate dn  |         |` \
-c "mwrite -S 0x57 1024 1024"   `# mwrite       |     WWWWW              |` \
-c "truncate 5120"              `# truncate up  |                        |` \
-c "mwrite -S 0x59 2048 3072"   `# mwrite       |          YYYYYYYYYYYYYY|` \
-c "close"      \
$testfile | _filter_xfs_io
 
echo "==== Pre-Remount ==="
hexdump -C $testfile
_scratch_cycle_mount
echo "==== Post-Remount =="
hexdump -C $testfile

# third case is the same as second case, just with non-1k aligned offsets and
# sizes.
$XFS_IO_PROG -t -f \
-c "truncate 5121"              `# truncate     |                        |` \
-c "pwrite -S 0x58 0 5121"      `# write        |XXXXXXXXXXXXXXXXXXXXXXXX|` \
-c "mmap -rw 0 5121"            `# mmap         |                        |` \
-c "mwrite -S 0x5a 2047 3071"   `# mwrite       |          ZZZZZZZZZZZZZZ|` \
-c "truncate 2047"              `# truncate dn  |         |` \
-c "mwrite -S 0x57 513 1025"    `# mwrite       |  WWWWW                 |` \
-c "truncate 5121"              `# truncate up  |                        |` \
-c "mwrite -S 0x59 2047 3071"   `# mwrite       |          YYYYYYYYYYYYYY|` \
-c "close"      \
$testfile | _filter_xfs_io
 
echo "==== Pre-Remount ==="
hexdump -C $testfile
_scratch_cycle_mount
echo "==== Post-Remount =="
hexdump -C $testfile

status=0
exit