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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2014 Filipe Manana. All Rights Reserved.
#
# FS QA Test No. btrfs/037
#
# Test for a btrfs data corruption when using compressed files/extents.
# Under certain cases, it was possible for reads to return random data
# (content from a previously used page) instead of zeroes. This also
# caused partial updates to those regions that were supposed to be filled
# with zeroes to save random (and invalid) data into the file extents.
#
# This is fixed by the commit for the linux kernel titled:
#
# Btrfs: fix data corruption when reading/updating compressed extents
#
. ./common/preamble
_begin_fstest auto quick compress prealloc
tmp=`mktemp -d`
# Override the default cleanup function.
_cleanup()
{
rm -fr $tmp
}
. ./common/filter
_supported_fs btrfs
_require_scratch
_require_xfs_io_command "falloc"
_scratch_mkfs >/dev/null 2>&1
_scratch_mount "-o compress-force=lzo"
$XFS_IO_PROG -f -c "pwrite -S 0x06 -b 18670 266978 18670" \
$SCRATCH_MNT/foobar | _filter_xfs_io
$XFS_IO_PROG -c "falloc 26450 665194" $SCRATCH_MNT/foobar | _filter_xfs_io
$XFS_IO_PROG -c "truncate 542872" $SCRATCH_MNT/foobar | _filter_xfs_io
$XFS_IO_PROG -c "fsync" $SCRATCH_MNT/foobar | _filter_xfs_io
# Expected file items in the fs tree are (from btrfs-debug-tree):
#
# item 4 key (257 INODE_ITEM 0) itemoff 15879 itemsize 160
# inode generation 6 transid 6 size 542872 block group 0 mode 100600
# item 5 key (257 INODE_REF 256) itemoff 15863 itemsize 16
# inode ref index 2 namelen 6 name: foobar
# item 6 key (257 EXTENT_DATA 0) itemoff 15810 itemsize 53
# extent data disk byte 0 nr 0 gen 6
# extent data offset 0 nr 24576 ram 266240
# extent compression 0
# item 7 key (257 EXTENT_DATA 24576) itemoff 15757 itemsize 53
# prealloc data disk byte 12849152 nr 241664 gen 6
# prealloc data offset 0 nr 241664
# item 8 key (257 EXTENT_DATA 266240) itemoff 15704 itemsize 53
# extent data disk byte 12845056 nr 4096 gen 6
# extent data offset 0 nr 20480 ram 20480
# extent compression 2
# item 9 key (257 EXTENT_DATA 286720) itemoff 15651 itemsize 53
# prealloc data disk byte 13090816 nr 405504 gen 6
# prealloc data offset 0 nr 258048
#
# The on disk extent at 266240, contains 5 compressed chunks of file data.
# Each of the first 4 chunks compress 4096 bytes of file data, while the last
# one compresses only 3024 bytes of file data. Because this extent item is not
# the last one in the file, as it followed by a prealloc extent, reads into
# the region [285648 ; 286720[ (length = 4096 - 3024) should return zeroes.
_scratch_unmount
_check_btrfs_filesystem $SCRATCH_DEV
EXPECTED_MD5="b8b0dbb8e02f94123c741c23659a1c0a"
for i in `seq 1 27`
do
_scratch_mount "-o ro"
MD5=`md5sum $SCRATCH_MNT/foobar | cut -f 1 -d ' '`
_scratch_unmount
if [ "${MD5}x" != "${EXPECTED_MD5}x" ]
then
echo "Unexpected file digest (wanted $EXPECTED_MD5, got $MD5)"
fi
done
status=0
exit
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