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

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Message-ID: <2025070253-erased-armadillo-0984@gregkh>
Date: Wed, 2 Jul 2025 12:20:30 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Lee Jones <lee@...nel.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 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?

thanks,

greg k-h