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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2018 SUSE Linux Products GmbH. All Rights Reserved.
#
# FSQA Test No. 159
#
# Test that when we have the no-holes mode enabled and a specific metadata
# layout, if we punch a hole and fsync the file, at replay time the whole
# hole was preserved.
#
. ./common/preamble
_begin_fstest auto quick punch log
# Override the default cleanup function.
_cleanup()
{
_cleanup_flakey
cd /
rm -f $tmp.*
}
. ./common/filter
. ./common/dmflakey
_supported_fs btrfs
_require_scratch
_require_dm_target flakey
_require_xfs_io_command "fpunch"
_require_odirect
run_test()
{
local punch_offset=$1
# We create the filesystem with a node size of 64Kb because we need to
# create a specific metadata layout in order to trigger the bug we are
# testing. At the moment the node size can not be smaller then the
# system's page size, so given that the largest possible page size is
# 64Kb and by default the node size is set to the system's page size
# value, we explicitly create a filesystem with a 64Kb node size.
_scratch_mkfs -O no-holes -n $((64 * 1024)) >>$seqres.full 2>&1
_require_metadata_journaling $SCRATCH_DEV
_init_flakey
_mount_flakey
# Create our test file with 832 extents of 256Kb each. Before each
# extent, there is a 256Kb hole (except for the first extent, which
# starts at offset 0). This creates two leafs in the filesystem tree.
# We use direct IO to ensure we get exactly 256K extents (with buffered
# IO we can get writeback triggered at any time and therefore get
# extents smaller than 256K).
for ((i = 0; i <= 831; i++)); do
local offset=$((i * 2 * 256 * 1024))
$XFS_IO_PROG -f -d -c "pwrite -S 0xab -b 256K $offset 256K" \
$SCRATCH_MNT/foobar >/dev/null
done
# Make sure everything done so far is durably persisted.
sync
# Now punch a hole that covers part of the extent at offset
# "$punch_offset".
# We want to punch a hole that starts in the middle of the last extent
# item in the first leaf. On a system without selinux enabled that is
# the extent that starts at offset 216530944, while on a system with it
# enabled it is the extent that starts at offset 216006656 (because
# selinux causes a xattr item to be added to our test file).
$XFS_IO_PROG -c "fpunch $((punch_offset + 128 * 1024 - 4000)) 256K" \
-c "fsync" \
$SCRATCH_MNT/foobar
echo "File digest before power failure:"
md5sum $SCRATCH_MNT/foobar | _filter_scratch
# Simulate a power failure and mount the filesystem to check that
# replaying the fsync log/journal succeeds and our test file has the
# expected content.
_flakey_drop_and_remount
echo "File digest after power failure and log replay:"
md5sum $SCRATCH_MNT/foobar | _filter_scratch
_unmount_flakey
_cleanup_flakey
}
run_test 216006656
run_test 216530944
status=0
exit
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