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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2019 SUSE Linux Products GmbH. All Rights Reserved.
#
# FSQA Test No. 183
#
# Regression test for read corruption of compressed and shared extents after
# punching holes into a file.
#
. ./common/preamble
_begin_fstest auto quick clone compress punch
. ./common/filter
. ./common/reflink
_supported_fs btrfs
_require_scratch_reflink
_require_xfs_io_command "fpunch"
_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount "-o compress"
# Create a file with 3 consecutive compressed extents, each corresponds to 128Kb
# of data (uncompressed size) and each is stored on disk as a 4Kb extent
# (compressed size, regardless of compression algorithm used).
# Each extent starts with 4Kb of zeroes, while the remaining bytes all have a
# value of 0xff.
$XFS_IO_PROG -f -c "pwrite -S 0xff 0 384K" \
-c "pwrite -S 0x00 0 4K" \
-c "pwrite -S 0x00 128K 4K" \
-c "pwrite -S 0x00 256K 4K" \
$SCRATCH_MNT/foobar | _filter_xfs_io
echo "File digest after initial creation:"
md5sum $SCRATCH_MNT/foobar | _filter_scratch
# Clone the first extent into offsets 128K and 256K.
$XFS_IO_PROG -c "reflink $SCRATCH_MNT/foobar 0 128K 128K" \
-c "reflink $SCRATCH_MNT/foobar 0 256K 128K" \
$SCRATCH_MNT/foobar | _filter_xfs_io
echo "File digest after reflinking:"
md5sum $SCRATCH_MNT/foobar | _filter_scratch
# Punch holes into the regions that are already full of zeroes.
$XFS_IO_PROG -c "fpunch 0 4K" \
-c "fpunch 128K 4K" \
-c "fpunch 256K 4K" \
$SCRATCH_MNT/foobar
echo "File digest after punching holes:"
md5sum $SCRATCH_MNT/foobar | _filter_scratch
echo 1 > /proc/sys/vm/drop_caches
echo "File digest after dropping page cache:"
md5sum $SCRATCH_MNT/foobar | _filter_scratch
status=0
exit
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