linux-kernel - Re: [STABLE 5.15+] f2fs: sysfs: add encoding

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Message-ID: <20250723082639.GP11056@google.com>
Date: Wed, 23 Jul 2025 09:26:39 +0100
From: Lee Jones <lee@...nel.org>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Chao Yu <chao@...nel.org>, stable@...r.kernel.org,
	Sasha Levin <sashal@...nel.org>, jaegeuk@...nel.org,
	linux-f2fs-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: [STABLE 5.15+] f2fs: sysfs: add encoding_flags entry

On Wed, 02 Jul 2025, Greg Kroah-Hartman wrote:

> On Tue, Jun 24, 2025 at 11:00:39AM +0100, Lee Jones wrote:
> > On Wed, 16 Apr 2025, Chao Yu wrote:
> > 
> > > This patch adds a new sysfs entry /sys/fs/f2fs/<disk>/encoding_flags,
> > > it is a read-only entry to show the value of sb.s_encoding_flags, the
> > > value is hexadecimal.
> > > 
> > > ===========================      ==========
> > > Flag_Name                        Flag_Value
> > > ===========================      ==========
> > > SB_ENC_STRICT_MODE_FL            0x00000001
> > > SB_ENC_NO_COMPAT_FALLBACK_FL     0x00000002
> > > ===========================      ==========
> > > 
> > > case#1
> > > mkfs.f2fs -f -O casefold -C utf8:strict /dev/vda
> > > mount /dev/vda /mnt/f2fs
> > > cat /sys/fs/f2fs/vda/encoding_flags
> > > 1
> > > 
> > > case#2
> > > mkfs.f2fs -f -O casefold -C utf8 /dev/vda
> > > fsck.f2fs --nolinear-lookup=1 /dev/vda
> > > mount /dev/vda /mnt/f2fs
> > > cat /sys/fs/f2fs/vda/encoding_flags
> > > 2
> > > 
> > > Signed-off-by: Chao Yu <chao@...nel.org>
> > > ---
> > >  Documentation/ABI/testing/sysfs-fs-f2fs | 13 +++++++++++++
> > >  fs/f2fs/sysfs.c                         |  9 +++++++++
> > >  2 files changed, 22 insertions(+)
> > 
> > This patch, commit 617e0491abe4 ("f2fs: sysfs: export linear_lookup in
> > features directory") upstream, needs to find its way into all Stable
> > branches containing upstream commit 91b587ba79e1 ("f2fs: Introduce
> > linear search for dentries"), which is essentially linux-5.15.y and
> > newer.
> > 
> > stable/linux-5.4.y:
> > MISSING:     f2fs: Introduce linear search for dentries
> > MISSING:     f2fs: sysfs: export linear_lookup in features directory
> > 
> > stable/linux-5.10.y:
> > MISSING:     f2fs: Introduce linear search for dentries
> > MISSING:     f2fs: sysfs: export linear_lookup in features directory
> > 
> > stable/linux-5.15.y:
> > b0938ffd39ae f2fs: Introduce linear search for dentries [5.15.179]
> > MISSING:     f2fs: sysfs: export linear_lookup in features directory
> > 
> > stable/linux-6.1.y:
> > de605097eb17 f2fs: Introduce linear search for dentries [6.1.129]
> > MISSING:     f2fs: sysfs: export linear_lookup in features directory
> > 
> > stable/linux-6.6.y:
> > 0bf2adad03e1 f2fs: Introduce linear search for dentries [6.6.76]
> > MISSING:     f2fs: sysfs: export linear_lookup in features directory
> > 
> > stable/linux-6.12.y:
> > 00d1943fe46d f2fs: Introduce linear search for dentries [6.12.13]
> > MISSING:     f2fs: sysfs: export linear_lookup in features directory
> > 
> > mainline:
> > 91b587ba79e1 f2fs: Introduce linear search for dentries
> > 617e0491abe4 f2fs: sysfs: export linear_lookup in features directory
> 
> Great, then can someone submit these in a format we can apply them in?
> or do clean cherry-picks work properly?

Does this work:

Please backport upstream commit:

  617e0491abe4 f2fs: sysfs: export linear_lookup in features directory

... to all stable branches up to and including linux-5.15.y.

If there are conflicts, I can do the backport myself and submit as patches.

-- 
Lee Jones [李琼斯]