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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2020 SUSE Linux Products GmbH. All Rights Reserved.
#
# FSQA Test No. 209
#
# Test a scenario were we fsync a range of a file and have a power failure.
# We want to check that after a power failure and mounting the filesystem, we
# do not end up with a missing file extent representing a hole. This applies
# only when not using the NO_HOLES feature.
#
. ./common/preamble
_begin_fstest auto quick log
# Override the default cleanup function.
_cleanup()
{
_cleanup_flakey
cd /
rm -f $tmp.*
}
. ./common/attr
. ./common/filter
. ./common/dmflakey
_supported_fs btrfs
_require_scratch
_require_dm_target flakey
_require_btrfs_fs_feature "no_holes"
_require_btrfs_mkfs_feature "no-holes"
_require_xfs_io_command "sync_range"
_scratch_mkfs -O ^no-holes >>$seqres.full 2>&1
_require_metadata_journaling $SCRATCH_DEV
_init_flakey
_mount_flakey
# Create a 256K file with a single extent and fsync it to clear the full sync
# bit from the inode - we want the msync below to trigger a fast fsync.
$XFS_IO_PROG -f \
-c "pwrite -S 0xab 0 256K" \
-c "fsync" \
$SCRATCH_MNT/foo | _filter_xfs_io
# Force a transaction commit and wipe out the log tree.
sync
# Dirty 768K of data, increasing the file size to 1Mb, and flush only the range
# from 256K to 512K without updating the log tree (sync_file_range() does not
# trigger fsync, it only starts writeback and waits for it to finish).
$XFS_IO_PROG -c "pwrite -S 0xcd 256K 768K" \
-c "sync_range -abw 256K 256K" \
$SCRATCH_MNT/foo | _filter_xfs_io
# Now dirty the range from 768K to 1M again and sync that range.
$XFS_IO_PROG \
-c "mmap -w 768K 256K" \
-c "mwrite -S 0xef 768K 256K" \
-c "msync -s 768K 256K" \
-c "munmap" \
$SCRATCH_MNT/foo | _filter_xfs_io
echo "File digest before power failure: $(_md5_checksum $SCRATCH_MNT/foo)"
# Simulate a power failure and mount again the filesystem.
_flakey_drop_and_remount
# Should match what we got before the power failure.
echo "File digest after power failure: $(_md5_checksum $SCRATCH_MNT/foo)"
# We also want to check that fsck doesn't fail due to an error of a missing
# file extent item that represents a hole for the range 256K to 512K. The
# fstests framework does the fsck once the test exits.
_unmount_flakey
status=0
exit
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