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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. 211
#
# Test that if we fsync a file with prealloc extents that start before and
# after the file's size, we don't end up with missing parts of the extents
# and implicit file holes after a power failure. Test both without and with
# the NO_HOLES feature.
#
. ./common/preamble
_begin_fstest auto quick log prealloc fiemap
# Override the default cleanup function.
_cleanup()
{
_cleanup_flakey
cd /
rm -f $tmp.*
}
. ./common/filter
. ./common/dmflakey
_supported_fs btrfs
_require_scratch
_require_xfs_io_command "falloc" "-k"
# fiemap needed by _count_extents()
_require_xfs_io_command "fiemap"
_require_btrfs_fs_feature "no_holes"
_require_btrfs_mkfs_feature "no-holes"
_require_dm_target flakey
run_test()
{
# Create our test file with 2 consecutive prealloc extents, each with a size
# of 128Kb, and covering the range from 0 to 256Kb, with a file size of 0.
# Then fsync the file to record both extents in a log tree.
$XFS_IO_PROG -f -c "falloc -k 0 128K" $SCRATCH_MNT/foo
$XFS_IO_PROG -c "falloc -k 128K 128K" $SCRATCH_MNT/foo
$XFS_IO_PROG -c "fsync" $SCRATCH_MNT/foo
# Now do a redudant extent allocation for the range from 0 to 64Kb. This will
# merely increase the file size from 0 to 64Kb. Instead we could also do a
# truncate to set the file size to 64Kb.
$XFS_IO_PROG -c "falloc 0 64K" $SCRATCH_MNT/foo
# Fsync the file, so we update the log with the new file size. Here btrfs
# used to incorrectly set the number of bytes to 64Kb for the prealloc extent
# that covers the file range from 0 to 128Kb.
$XFS_IO_PROG -c "fsync" $SCRATCH_MNT/foo
# Now set the file size to 256K with a truncate and then fsync the file. We
# want to verify the log tree doesn't end up with an implicit hole for the
# file range from 64Kb to 128Kb. That would lead to an implicit hole after
# replaying the log and losing part of the prealloc extent, so a future write
# to anywhere in the file range from 64Kb to 128Kb would result in allocating
# a new extent and not use the extent previously allocated with fallocate().
$XFS_IO_PROG -c "truncate 256K" -c "fsync" $SCRATCH_MNT/foo
# Simulate a power failure and then mount again the filesystem to replay the
# log tree.
_flakey_drop_and_remount
# Unmount the filesystem and run 'btrfs check'/fsck to verify that we don't
# have a missing hole for the file range from 64K to 128K.
_unmount_flakey
_check_scratch_fs $FLAKEY_DEV
_mount_flakey
# Now write to the file range from 0 to 128K. After this we should still have
# rwo extents in our file, corresponding to the 2 extents we allocated before
# using fallocate(). In particular writing to the file range from 64Kb to
# 128Kb should not have allocated a new extent.
$XFS_IO_PROG -c "pwrite -S 0xab 0 128K" $SCRATCH_MNT/foo | _filter_xfs_io
echo "File extent count after write: $(_count_extents $SCRATCH_MNT/foo)"
}
_scratch_mkfs -O ^no-holes >>$seqres.full 2>&1
_require_metadata_journaling $SCRATCH_DEV
_init_flakey
_mount_flakey
echo "Testing without NO_HOLES feature"
run_test
_unmount_flakey
_cleanup_flakey
_scratch_mkfs -O no-holes >>$seqres.full 2>&1
_require_metadata_journaling $SCRATCH_DEV
_init_flakey
_mount_flakey
echo
echo "Testing with the NO_HOLES feature"
run_test
_unmount_flakey
status=0
exit
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