[v2,1/2] f2fs/006: add testcase to check out-of-space case

Commit Message

Chao Yu Oct. 23, 2024, 8:16 a.m. UTC

This is a regression test to check whether f2fs handles dirty
data correctly when checkpoint is disabled, if lfs mode is on,
it will trigger OPU for all overwritten data, this will cost
free segments, so f2fs must account overwritten data as OPU
data when calculating free space, otherwise, it may run out
of free segments in f2fs' allocation function, resulting in
panic.

Cc: Jaegeuk Kim <[e-mail]>
Signed-off-by: Chao Yu <[e-mail]>
---
v2:
- add _fixed_by_kernel_commit()
- use _scratch_mkfs_sized() rather than formating size-specified
loop device
- code cleanup
 tests/f2fs/006     | 38 ++++++++++++++++++++++++++++++++++++++
 tests/f2fs/006.out |  6 ++++++
 2 files changed, 44 insertions(+)
 create mode 100755 tests/f2fs/006
 create mode 100644 tests/f2fs/006.out

Comments

Zorro Lang Oct. 25, 2024, 3:44 a.m. UTC | #1

On Wed, Oct 23, 2024 at 04:16:01PM +0800, Chao Yu wrote:
> This is a regression test to check whether f2fs handles dirty
> data correctly when checkpoint is disabled, if lfs mode is on,
> it will trigger OPU for all overwritten data, this will cost
> free segments, so f2fs must account overwritten data as OPU
> data when calculating free space, otherwise, it may run out
> of free segments in f2fs' allocation function, resulting in
> panic.
> 
> Cc: Jaegeuk Kim <[e-mail]>
> Signed-off-by: Chao Yu <[e-mail]>
> ---
> v2:
> - add _fixed_by_kernel_commit()
> - use _scratch_mkfs_sized() rather than formating size-specified
> loop device
> - code cleanup
>  tests/f2fs/006     | 38 ++++++++++++++++++++++++++++++++++++++
>  tests/f2fs/006.out |  6 ++++++
>  2 files changed, 44 insertions(+)
>  create mode 100755 tests/f2fs/006
>  create mode 100644 tests/f2fs/006.out
> 
> diff --git a/tests/f2fs/006 b/tests/f2fs/006
> new file mode 100755
> index 00000000..63d00018
> --- /dev/null
> +++ b/tests/f2fs/006
> @@ -0,0 +1,38 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2024 Oppo.  All Rights Reserved.
> +#
> +# FS QA Test No. f2fs/006
> +#
> +# This is a regression test to check whether f2fs handles dirty
> +# data correctly when checkpoint is disabled, if lfs mode is on,
> +# it will trigger OPU for all overwritten data, this will cost
> +# free segments, so f2fs must account overwritten data as OPU
> +# data when calculating free space, otherwise, it may run out
> +# of free segments in f2fs' allocation function, resulting in
> +# panic.
> +#
> +. ./common/preamble
> +_begin_fstest auto quick
> +
> +_fixed_by_kernel_commit xxxxxxxxxxxx \
> +	"f2fs: fix to account dirty data in __get_secs_required()"
> +
> +testfile=$SCRATCH_MNT/testfile
> +
> +_require_scratch
> +_scratch_mkfs_sized $((1024*1024*100)) >> $seqres.full
> +
> +# use mode=lfs to let f2fs always triggers OPU
> +_scratch_mount -o mode=lfs,checkpoint=disable:10%,noinline_dentry >> $seqres.full
> +
> +dd if=/dev/zero of=$testfile bs=1M count=50 2>/dev/null
> +
> +# it may run out of free space of f2fs and hang kernel
> +dd if=/dev/zero of=$testfile bs=1M count=50 conv=notrunc conv=fsync
> +dd if=/dev/zero of=$testfile bs=1M count=50 conv=notrunc conv=fsync

What kind of failure should be printed at here if test on unfixed kernel?
I got:

# diff -u /root/git/xfstests/tests/f2fs/006.out /root/git/xfstests/results//default/f2fs/006.out.bad|less
--- /root/git/xfstests/tests/f2fs/006.out       2024-10-25 11:33:54.693883281 +0800
+++ /root/git/xfstests/results//default/f2fs/006.out.bad        2024-10-25 11:34:55.907252401 +0800
@@ -1,6 +1,6 @@
 QA output created by 006
 50+0 records in
 50+0 records out
-dd: error writing '/mnt/scratch_f2fs/testfile': No space left on device
-3+0 records in
-2+0 records out
+dd: fsync failed for '/mnt/scratch/testfile': Input/output error
+50+0 records in
+50+0 records out

Does that mean the bug is reproduced?

> +
> +_scratch_remount checkpoint=enable
> +
> +status=0
> +exit
> diff --git a/tests/f2fs/006.out b/tests/f2fs/006.out
> new file mode 100644
> index 00000000..0d7b3910
> --- /dev/null
> +++ b/tests/f2fs/006.out
> @@ -0,0 +1,6 @@
> +QA output created by 006
> +50+0 records in
> +50+0 records out
> +dd: error writing '/mnt/scratch_f2fs/testfile': No space left on device

The "/mnt/scratch_f2fs" should be SCRATCH_MNT, please use _filter_scratch()
by importing common/filter.

> +3+0 records in
> +2+0 records out
> -- 
> 2.40.1
>

Patch

diff --git a/tests/f2fs/006 b/tests/f2fs/006
new file mode 100755
index 00000000..63d00018
--- /dev/null
+++ b/tests/f2fs/006
@@ -0,0 +1,38 @@ 
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2024 Oppo.  All Rights Reserved.
+#
+# FS QA Test No. f2fs/006
+#
+# This is a regression test to check whether f2fs handles dirty
+# data correctly when checkpoint is disabled, if lfs mode is on,
+# it will trigger OPU for all overwritten data, this will cost
+# free segments, so f2fs must account overwritten data as OPU
+# data when calculating free space, otherwise, it may run out
+# of free segments in f2fs' allocation function, resulting in
+# panic.
+#
+. ./common/preamble
+_begin_fstest auto quick
+
+_fixed_by_kernel_commit xxxxxxxxxxxx \
+	"f2fs: fix to account dirty data in __get_secs_required()"
+
+testfile=$SCRATCH_MNT/testfile
+
+_require_scratch
+_scratch_mkfs_sized $((1024*1024*100)) >> $seqres.full
+
+# use mode=lfs to let f2fs always triggers OPU
+_scratch_mount -o mode=lfs,checkpoint=disable:10%,noinline_dentry >> $seqres.full
+
+dd if=/dev/zero of=$testfile bs=1M count=50 2>/dev/null
+
+# it may run out of free space of f2fs and hang kernel
+dd if=/dev/zero of=$testfile bs=1M count=50 conv=notrunc conv=fsync
+dd if=/dev/zero of=$testfile bs=1M count=50 conv=notrunc conv=fsync
+
+_scratch_remount checkpoint=enable
+
+status=0
+exit
diff --git a/tests/f2fs/006.out b/tests/f2fs/006.out
new file mode 100644
index 00000000..0d7b3910
--- /dev/null
+++ b/tests/f2fs/006.out
@@ -0,0 +1,6 @@ 
+QA output created by 006
+50+0 records in
+50+0 records out
+dd: error writing '/mnt/scratch_f2fs/testfile': No space left on device
+3+0 records in
+2+0 records out