[PATCH] fstests: btrfs/049: add regression test for compress-force=lzo mount option
From: Qu Wenruo <hidden>
Date: 2021-11-12 02:35:57
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 fix is titled "btrfs: fix a out-of-boundary access for
copy_compressed_data_to_page()".
This patch will add such regression test for compress-force=lzo mount
option against incompressible data.
Signed-off-by: Qu Wenruo <redacted>
---
tests/btrfs/049 | 41 +++++++++++++++++++++++++++++++++++++++++
tests/btrfs/049.out | 1 +
2 files changed, 42 insertions(+)
create mode 100755 tests/btrfs/049
diff --git a/tests/btrfs/049 b/tests/btrfs/049
new file mode 100755
index 00000000..5a73f738
--- /dev/null
+++ b/tests/btrfs/049@@ -0,0 +1,41 @@ +#! /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 compress-force=lzo hits 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 + +_scratch_mkfs >> $seqres.full +_scratch_mount -o compress-force=lzo + +$XFS_IO_PROG -f -c "pwrite -i /dev/urandom 0 4k" $SCRATCH_MNT/file > /dev/null + +# With kernel commit d4088803f511 ("btrfs: subpage: make lzo_compress_pages() +# compatible"), the kernel would crash when writing back above data. +_scratch_unmount + +echo "Silence is golden" + +# success, all done +status=0 +exit
diff --git a/tests/btrfs/049.out b/tests/btrfs/049.out
index cb0061b3..c69568ad 100644
--- a/tests/btrfs/049.out
+++ b/tests/btrfs/049.out@@ -1 +1,2 @@ QA output created by 049 +Silence is golden
--
2.33.0