On Fri, Aug 08, 2025 at 02:58:03PM +0800, Chao Yu wrote:
> w/ below change [1], f2fs will enable lookup_mode=perf by default, it
> will change f2fs dirent lookup method from linear based lookup to hash
> based lookup.
>
> So that, f2fs will ignore sb.s_encoding_flags by default, which is not
> compatible w/ f2fs/012 testcase, in where it will control lookup method
> by configuring this flag w/ fsck.f2fs.
>
> To avoid failure of f2fs/012, let's check whether f2fs has supported
> "lookup_mode=auto" mount option, mount w/ the option if it can,
> otherwise, don't.
>
> [1]
> https://lore.kernel.org/linux-f2fs-devel/20250805065228.1473089-1-chul...@google.com
>
> Cc: Daniel Lee <chul...@google.com>
> Signed-off-by: Chao Yu <c...@kernel.org>
> ---
With this patch, I always get below error:
f2fs/012 2s ... - output mismatch (see
/root/git/xfstests/results//f2fs/012.out.bad)
--- tests/f2fs/012.out 2025-07-21 13:33:12.379585206 +0800
+++ /root/git/xfstests/results//f2fs/012.out.bad 2025-08-15
23:51:54.156835560 +0800
@@ -1,2 +1,4 @@
QA output created by 012
+mount: /mnt/scratch: wrong fs type, bad option, bad superblock on
/dev/sda6, missing codepage or helper program, or other error.
+ dmesg(1) may have more information after failed mount system call.
Silence is golden
...
(Run 'diff -u /root/git/xfstests/tests/f2fs/012.out
/root/git/xfstests/results//f2fs/012.out.bad' to see the entire diff)
Then test passed without this patch:
f2fs/012 2s ... 3s
Ran: f2fs/012
Passed all 1 tests
> tests/f2fs/012 | 13 +++++++++++--
> 1 file changed, 11 insertions(+), 2 deletions(-)
>
> diff --git a/tests/f2fs/012 b/tests/f2fs/012
> index b3df9a8f..15fc8f0c 100755
> --- a/tests/f2fs/012
> +++ b/tests/f2fs/012
> @@ -22,6 +22,15 @@ _require_scratch_nocheck
> _require_command "$F2FS_IO_PROG" f2fs_io
> _require_command "$F2FS_INJECT_PROG" inject.f2fs
>
> +#check whether f2fs supports "lookup_mode=x" mount option
> +mntopt=""
> +_scratch_mkfs -O casefold -C utf8 >> $seqres.full
> +_try_scratch_mount "-o lookup_mode=auto"
> +if [ $? == 0 ]; then
> + mntopt="-o lookup_mode=auto"
> + _scratch_unmount
> +fi
> +
> check_lookup()
> {
> local nolinear_lookup=$1
> @@ -30,7 +39,7 @@ check_lookup()
> local redheart=$dir/$'\u2764\ufe0f'
>
> _scratch_mkfs -O casefold -C utf8 >> $seqres.full
> - _scratch_mount
> + _scratch_mount $mntopt
>
> mkdir $dir
> $F2FS_IO_PROG setflags casefold $dir >> $seqres.full
> @@ -52,7 +61,7 @@ check_lookup()
>
> $F2FS_INJECT_PROG --dent --mb d_hash --nid $ino --val 0x9a2ea068
> $SCRATCH_DEV >> $seqres.full
>
> - _scratch_mount
> + _scratch_mount $mntopt
> if [ $nolinear_lookup == "1" ]; then
> [ -f $redheart ] && _fail "red heart file should not exist"
> else
> --
> 2.40.1
>
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