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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved.
#
# FSQA Test No. 177
#
# Test that a file fsync works after punching a hole for the same file range
# multiple times and that after log/journal replay the file's content is
# correct.
#
# This test is motivated by a bug found in btrfs.
#
. ./common/preamble
_begin_fstest auto quick prealloc metadata punch log fiemap
# Override the default cleanup function.
_cleanup()
{
_cleanup_flakey
cd /
rm -f $tmp.*
}
# Import common functions.
. ./common/filter
. ./common/punch
. ./common/dmflakey
# real QA test starts here
_supported_fs generic
_require_scratch
_require_xfs_io_command "fpunch"
_require_xfs_io_command "fiemap"
_require_dm_target flakey
_scratch_mkfs >>$seqres.full 2>&1
_require_metadata_journaling $SCRATCH_DEV
_init_flakey
_mount_flakey
BLOCK_SIZE=$(_get_file_block_size $SCRATCH_MNT)
# Create out test file with some data and then fsync it.
# We do the fsync only to make sure the last fsync we do in this test triggers
# the fast code path of btrfs' fsync implementation, a condition necessary to
# trigger the bug btrfs had.
$XFS_IO_PROG -f -c "pwrite -S 0xaa 0K $(($BLOCK_SIZE * 32))" \
-c "fsync" \
$SCRATCH_MNT/foobar | _filter_xfs_io_blocks_modified
# Now punch a hole against the range [96K, 128K[.
$XFS_IO_PROG -c "fpunch $(($BLOCK_SIZE * 24)) $(($BLOCK_SIZE * 8))" $SCRATCH_MNT/foobar
# Punch another hole against a range that overlaps the previous range and ends
# beyond eof.
$XFS_IO_PROG -c "fpunch $(($BLOCK_SIZE * 16)) $(($BLOCK_SIZE * 32))" $SCRATCH_MNT/foobar
# Punch another hole against a range that overlaps the first range ([96K, 128K[)
# and ends at eof.
$XFS_IO_PROG -c "fpunch $(($BLOCK_SIZE * 8)) $(($BLOCK_SIZE * 24))" $SCRATCH_MNT/foobar
# Fsync our file. We want to verify that, after a power failure and mounting the
# filesystem again, the file content reflects all the hole punch operations.
$XFS_IO_PROG -c "fsync" $SCRATCH_MNT/foobar
echo "File digest before power failure:"
od -t x1 $SCRATCH_MNT/foobar | _filter_od
echo "Fiemap before power failure:"
$XFS_IO_PROG -c "fiemap -v" $SCRATCH_MNT/foobar | _filter_fiemap $BLOCK_SIZE
_flakey_drop_and_remount
echo "File digest after log replay:"
# Must match the same digest we got before the power failure.
od -t x1 $SCRATCH_MNT/foobar | _filter_od
echo "Fiemap after log replay:"
# Must match the same extent listing we got before the power failure.
$XFS_IO_PROG -c "fiemap -v" $SCRATCH_MNT/foobar | _filter_fiemap $BLOCK_SIZE
_unmount_flakey
status=0
exit
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