mirror of
https://github.com/linux-apfs/apfstests.git
synced 2026-05-01 15:01:44 -07:00
Filipe Manana
e8341568c1
Test that doing a direct IO write against a file range that contains one prealloc extent and one compressed extent works correctly. From the linux kernel 4.0 onwards, this either triggered an assertion failure (leading to a BUG_ON) when CONFIG_BTRFS_ASSERT=y or resulted in an arithmetic underflow of an inode's space reservation for write operations. That issue is fixed by the following linux kernel patch: "Btrfs: fix extent accounting for partial direct IO writes" Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
109 lines
4.0 KiB
Bash
109 lines
4.0 KiB
Bash
#! /bin/bash
|
|
# FSQA Test No. 026
|
|
#
|
|
# Test that doing a direct IO write against a file range that contains one
|
|
# prealloc extent and one compressed extent works correctly.
|
|
#
|
|
#-----------------------------------------------------------------------
|
|
#
|
|
# Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved.
|
|
# Author: Filipe Manana <fdmanana@suse.com>
|
|
#
|
|
# This program is free software; you can redistribute it and/or
|
|
# modify it under the terms of the GNU General Public License as
|
|
# published by the Free Software Foundation.
|
|
#
|
|
# This program is distributed in the hope that it would be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with this program; if not, write the Free Software Foundation,
|
|
# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
#-----------------------------------------------------------------------
|
|
#
|
|
|
|
seq=`basename $0`
|
|
seqres=$RESULT_DIR/$seq
|
|
echo "QA output created by $seq"
|
|
tmp=/tmp/$$
|
|
status=1 # failure is the default!
|
|
trap "_cleanup; exit \$status" 0 1 2 3 15
|
|
|
|
_cleanup()
|
|
{
|
|
cd /
|
|
rm -f $tmp.*
|
|
}
|
|
|
|
# get standard environment, filters and checks
|
|
. ./common/rc
|
|
. ./common/filter
|
|
|
|
# real QA test starts here
|
|
_need_to_be_root
|
|
_supported_fs btrfs
|
|
_supported_os Linux
|
|
_require_scratch
|
|
_require_xfs_io_command "falloc"
|
|
|
|
rm -f $seqres.full
|
|
|
|
_scratch_mkfs >>$seqres.full 2>&1
|
|
_scratch_mount "-o compress"
|
|
|
|
# Create a compressed extent covering the range [700K, 800K[.
|
|
$XFS_IO_PROG -f -s -c "pwrite -S 0xaa -b 100K 700K 100K" $SCRATCH_MNT/foo \
|
|
| _filter_xfs_io
|
|
|
|
# Create prealloc extent covering the range [600K, 700K[.
|
|
$XFS_IO_PROG -c "falloc 600K 100K" $SCRATCH_MNT/foo
|
|
|
|
# Write 80K of data to the range [640K, 720K[ using direct IO. This range covers
|
|
# both the prealloc extent and the compressed extent. Because there's a
|
|
# compressed extent in the range we are writing to, the DIO write code path ends
|
|
# up only writing the first 60k of data, which goes to the prealloc extent, and
|
|
# then falls back to buffered IO for writing the remaining 20K of data - because
|
|
# that remaining data maps to a file range containing a compressed extent.
|
|
# When falling back to buffered IO, we used to trigger an assertion when
|
|
# releasing reserved space due to bad accounting of the inode's outstanding
|
|
# extents counter, which was set to 1 but we ended up decrementing it by 1 twice,
|
|
# once through the ordered extent for the 60K of data we wrote using direct IO,
|
|
# and once through the main direct IO handler (inode.cbtrfs_direct_IO()) because
|
|
# the direct IO write wrote less than 80K of data (60K).
|
|
$XFS_IO_PROG -d -c "pwrite -S 0xbb -b 80K 640K 80K" $SCRATCH_MNT/foo \
|
|
| _filter_xfs_io
|
|
|
|
# Now similar test as above but for very large write operations. This triggers
|
|
# special cases for an inode's outstanding extents accounting, as internally
|
|
# btrfs logically splits extents into 128Mb units.
|
|
$XFS_IO_PROG -f -s \
|
|
-c "pwrite -S 0xaa -b 128M 258M 128M" \
|
|
-c "falloc 0 258M" \
|
|
$SCRATCH_MNT/bar | _filter_xfs_io
|
|
$XFS_IO_PROG -d -c "pwrite -S 0xbb -b 256M 3M 256M" $SCRATCH_MNT/bar \
|
|
| _filter_xfs_io
|
|
|
|
# Now verify the file contents are correct and that they are the same even after
|
|
# unmounting and mounting the fs again (or evicting the page cache).
|
|
#
|
|
# For file foo, all bytes in the range [0, 640K[ must have a value of 0x00, all
|
|
# bytes in the range [640K, 720K[ must have a value of 0xbb and all bytes in the
|
|
# range [720K, 800K[ must have a value of 0xaa.
|
|
#
|
|
# For file bar, all bytes in the range [0, 3M[ must havea value of 0x00, all
|
|
# bytes in the range [3M, 259M[ must have a value of 0xbb and all bytes in the
|
|
# range [259M, 386M[ must have a value of 0xaa.
|
|
#
|
|
echo "File digests before remounting the file system:"
|
|
md5sum $SCRATCH_MNT/foo | _filter_scratch
|
|
md5sum $SCRATCH_MNT/bar | _filter_scratch
|
|
_scratch_remount
|
|
echo "File digests after remounting the file system:"
|
|
md5sum $SCRATCH_MNT/foo | _filter_scratch
|
|
md5sum $SCRATCH_MNT/bar | _filter_scratch
|
|
|
|
status=0
|
|
exit
|