blob: b60527cb1602b9232eb86c67cc52bf6d200f2fab (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved.
#
# FSQA Test No. 103
#
# Regression test for file read corruption when using compressed extents that
# are shared by multiple consecutive ranges of the same file.
#
. ./common/preamble
_begin_fstest auto quick clone compress
. ./common/filter
_supported_fs btrfs
_require_scratch
_require_cloner
test_clone_and_read_compressed_extent()
{
local mount_opts=$1
_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount $mount_opts
BLOCK_SIZE=$(_get_block_size $SCRATCH_MNT)
# Create a test file with a single extent that is compressed (the
# data we write into it is highly compressible no matter which
# compression algorithm is used, zlib or lzo).
$XFS_IO_PROG -f -c "pwrite -S 0xaa 0K $((1 * $BLOCK_SIZE))" \
-c "pwrite -S 0xbb $((1 * $BLOCK_SIZE)) $((2 * $BLOCK_SIZE))" \
-c "pwrite -S 0xcc $((3 * $BLOCK_SIZE)) $((1 * $BLOCK_SIZE))" \
$SCRATCH_MNT/foo | _filter_xfs_io_blocks_modified
# Now clone our extent into an adjacent offset.
$CLONER_PROG -s $((1 * $BLOCK_SIZE)) -d $((4 * $BLOCK_SIZE)) \
-l $((2 * $BLOCK_SIZE)) $SCRATCH_MNT/foo $SCRATCH_MNT/foo
# Same as before but for this file we clone the extent into a lower
# file offset.
$XFS_IO_PROG -f \
-c "pwrite -S 0xaa $((2 * $BLOCK_SIZE)) $((1 * $BLOCK_SIZE))" \
-c "pwrite -S 0xbb $((3 * $BLOCK_SIZE)) $((2 * $BLOCK_SIZE))" \
-c "pwrite -S 0xcc $((5 * $BLOCK_SIZE)) $((1 * $BLOCK_SIZE))" \
$SCRATCH_MNT/bar | _filter_xfs_io_blocks_modified
$CLONER_PROG -s $((3 * $BLOCK_SIZE)) -d 0 -l $((2 * $BLOCK_SIZE)) \
$SCRATCH_MNT/bar $SCRATCH_MNT/bar
echo "File contents before unmounting filesystem:"
echo "foo:"
od -t x1 $SCRATCH_MNT/foo | _filter_od
echo "bar:"
od -t x1 $SCRATCH_MNT/bar | _filter_od
# Evicting the inode or clearing the page cache before reading again
# the file would also trigger the bug - reads were returning all bytes
# in the range corresponding to the second reference to the extent with
# a value of 0, but the correct data was persisted (it was a bug
# exclusively in the read path). The issue happened only if the same
# readpages() call targeted pages belonging to the first and second
# ranges that point to the same compressed extent.
_scratch_cycle_mount
echo "File contents after mounting filesystem again:"
# Must match the same contents we got before.
echo "foo:"
od -t x1 $SCRATCH_MNT/foo | _filter_od
echo "bar:"
od -t x1 $SCRATCH_MNT/bar | _filter_od
}
echo -e "\nTesting with zlib compression..."
test_clone_and_read_compressed_extent "-o compress=zlib"
_scratch_unmount
echo -e "\nTesting with lzo compression..."
test_clone_and_read_compressed_extent "-o compress=lzo"
status=0
exit
|
