[PATCH v3] fstests: btrfs/049: add regression test for compress-force mount options
From: Qu Wenruo <hidden>
Date: 2021-11-25 06:07:50
Also in:
linux-btrfs
Subsystem:
the rest · Maintainer:
Linus Torvalds
Since kernel commit d4088803f511 ("btrfs: subpage: make lzo_compress_pages()
compatible"), lzo compression no longer respects the max compressed page
limit, and can cause kernel crash.
The upstream fix is 6f019c0e0193 ("btrfs: fix a out-of-bound access in
copy_compressed_data_to_page()").
This patch will add such regression test for all possible compress-force
mount options, including lzo, zstd and zlib.
And since we're here, also make sure the content of the file matches
after a mount cycle.
Signed-off-by: Qu Wenruo <redacted>
---
Changelog:
v2:
- Also test zlib and zstd
- Add file content verification check
v3:
- Use $tmp.good as a known good file source
- Also make sure we didn't get short read for the good copy
---
tests/btrfs/049 | 67 +++++++++++++++++++++++++++++++++++++++++++++
tests/btrfs/049.out | 6 ++++
2 files changed, 73 insertions(+)
create mode 100755 tests/btrfs/049
diff --git a/tests/btrfs/049 b/tests/btrfs/049
new file mode 100755
index 00000000..c1f35dc9
--- /dev/null
+++ b/tests/btrfs/049@@ -0,0 +1,67 @@ +#! /bin/bash +# SPDX-License-Identifier: GPL-2.0 +# Copyright (C) 2021 SUSE Linux Products GmbH. All Rights Reserved. +# +# FS QA Test 049 +# +# Test if btrfs will crash when using compress-force mount option against +# incompressible data +# +. ./common/preamble +_begin_fstest auto quick compress dangerous + +# Override the default cleanup function. +_cleanup() +{ + cd / + rm -r -f $tmp.* +} + +# Import common functions. +. ./common/filter + +# real QA test starts here + +# Modify as appropriate. +_supported_fs btrfs +_require_scratch + +pagesize=$(get_page_size) + +# Read the content from urandom to a known safe location +$XFS_IO_PROG -f -c "pwrite -i /dev/urandom 0 $pagesize" "$tmp.good" > /dev/null + +# Make sure we didn't get short read +if [ $(_get_filesize "$tmp.good") != "$pagesize" ]; then + _fail "Got a short read from /dev/urandom" +fi + +workload() +{ + local compression=$1 + + echo "=== Testing compress-force=$compression ===" + _scratch_mkfs -s "$pagesize">> $seqres.full + _scratch_mount -o compress-force="$compression" + cp "$tmp.good" "$SCRATCH_MNT/$compression" + + # When unpatched, compress-force=lzo would crash at data writeback + _scratch_cycle_mount + + # Make sure the content matches + if [ "$(_md5_checksum $tmp.good)" != \ + "$(_md5_checksum $SCRATCH_MNT/$compression)" ]; then + _fail "Content of '$SCRATCH_MNT/file' mismatch with known good copy" + else + echo "OK" + fi + _scratch_unmount +} + +workload lzo +workload zstd +workload zlib + +# success, all done +status=0 +exit
diff --git a/tests/btrfs/049.out b/tests/btrfs/049.out
index cb0061b3..41bffeaa 100644
--- a/tests/btrfs/049.out
+++ b/tests/btrfs/049.out@@ -1 +1,7 @@ QA output created by 049 +=== Testing compress-force=lzo === +OK +=== Testing compress-force=zstd === +OK +=== Testing compress-force=zlib === +OK
--
2.34.0