[PATCH 1/2] f2fs: sysfs: add encoding_flags entry

[PATCH 1/2] f2fs: sysfs: add encoding_flags entry

[Chao Yu]

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@kernel.org>
---
 Documentation/ABI/testing/sysfs-fs-f2fs | 13 +++++++++++++
 fs/f2fs/sysfs.c                         |  9 +++++++++
 2 files changed, 22 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
index 59adb7dc6f9e..0dbe6813b709 100644
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -846,3 +846,16 @@ Description:	For several zoned storage devices, vendors will provide extra space
 		reserved_blocks. However, it is not enough, since this extra space should
 		not be shown to users. So, with this new sysfs node, we can hide the space
 		by substracting reserved_blocks from total bytes.
+
+What:		/sys/fs/f2fs/<disk>/encoding_flags
+Date:		April 2025
+Contact:	"Chao Yu" <chao@kernel.org>
+Description:	This 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
+		===========================      ==========
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index 3a3485622691..cf98c5cbb98a 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -274,6 +274,13 @@ static ssize_t encoding_show(struct f2fs_attr *a,
 	return sysfs_emit(buf, "(none)\n");
 }
 
+static ssize_t encoding_flags_show(struct f2fs_attr *a,
+		struct f2fs_sb_info *sbi, char *buf)
+{
+	return sysfs_emit(buf, "%x\n",
+		le16_to_cpu(F2FS_RAW_SUPER(sbi)->s_encoding_flags));
+}
+
 static ssize_t mounted_time_sec_show(struct f2fs_attr *a,
 		struct f2fs_sb_info *sbi, char *buf)
 {
@@ -1158,6 +1165,7 @@ F2FS_GENERAL_RO_ATTR(features);
 F2FS_GENERAL_RO_ATTR(current_reserved_blocks);
 F2FS_GENERAL_RO_ATTR(unusable);
 F2FS_GENERAL_RO_ATTR(encoding);
+F2FS_GENERAL_RO_ATTR(encoding_flags);
 F2FS_GENERAL_RO_ATTR(mounted_time_sec);
 F2FS_GENERAL_RO_ATTR(main_blkaddr);
 F2FS_GENERAL_RO_ATTR(pending_discard);
@@ -1270,6 +1278,7 @@ static struct attribute *f2fs_attrs[] = {
 	ATTR_LIST(reserved_blocks),
 	ATTR_LIST(current_reserved_blocks),
 	ATTR_LIST(encoding),
+	ATTR_LIST(encoding_flags),
 	ATTR_LIST(mounted_time_sec),
 #ifdef CONFIG_F2FS_STAT_FS
 	ATTR_LIST(cp_foreground_calls),
-- 
2.49.0

[PATCH 2/2] f2fs: sysfs: export linear_lookup in features directory

[Chao Yu]

cat /sys/fs/f2fs/features/linear_lookup
supported

Signed-off-by: Chao Yu <chao@kernel.org>
---
 Documentation/ABI/testing/sysfs-fs-f2fs | 2 +-
 fs/f2fs/sysfs.c                         | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
index 0dbe6813b709..c805a48dd3dc 100644
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -270,7 +270,7 @@ Description:	Shows all enabled kernel features.
 		inode_checksum, flexible_inline_xattr, quota_ino,
 		inode_crtime, lost_found, verity, sb_checksum,
 		casefold, readonly, compression, test_dummy_encryption_v2,
-		atomic_write, pin_file, encrypted_casefold.
+		atomic_write, pin_file, encrypted_casefold, linear_lookup.
 
 What:		/sys/fs/f2fs/<disk>/inject_rate
 Date:		May 2016
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index cf98c5cbb98a..75134d69a0bd 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -1207,6 +1207,9 @@ F2FS_FEATURE_RO_ATTR(readonly);
 F2FS_FEATURE_RO_ATTR(compression);
 #endif
 F2FS_FEATURE_RO_ATTR(pin_file);
+#ifdef CONFIG_UNICODE
+F2FS_FEATURE_RO_ATTR(linear_lookup);
+#endif
 
 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
 static struct attribute *f2fs_attrs[] = {
@@ -1356,6 +1359,9 @@ static struct attribute *f2fs_feat_attrs[] = {
 	BASE_ATTR_LIST(compression),
 #endif
 	BASE_ATTR_LIST(pin_file),
+#ifdef CONFIG_UNICODE
+	BASE_ATTR_LIST(linear_lookup),
+#endif
 	NULL,
 };
 ATTRIBUTE_GROUPS(f2fs_feat);
-- 
2.49.0

Re: [f2fs-dev] [PATCH 1/2] f2fs: sysfs: add encoding_flags entry

[patchwork-bot+f2fs]

Hello:

This series was applied to jaegeuk/f2fs.git (dev)
by Jaegeuk Kim <jaegeuk@kernel.org>:

On Wed, 16 Apr 2025 13:48:04 +0800 you 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
> ===========================      ==========
> 
> [...]

Here is the summary with links:
  - [f2fs-dev,1/2] f2fs: sysfs: add encoding_flags entry
    https://git.kernel.org/jaegeuk/f2fs/c/0d56663919d2
  - [f2fs-dev,2/2] f2fs: sysfs: export linear_lookup in features directory
    https://git.kernel.org/jaegeuk/f2fs/c/217fc63224a9

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html

[STABLE 5.15+] f2fs: sysfs: add encoding_flags entry

[Lee Jones]

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@kernel.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

> diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs
> b/Documentation/ABI/testing/sysfs-fs-f2fs index
> 59adb7dc6f9e..0dbe6813b709 100644 ---
> a/Documentation/ABI/testing/sysfs-fs-f2fs +++
> b/Documentation/ABI/testing/sysfs-fs-f2fs @@ -846,3 +846,16 @@
> Description:	For several zoned storage devices, vendors will provide
> extra space reserved_blocks. However, it is not enough, since this
> extra space should not be shown to users. So, with this new sysfs
> node, we can hide the space by substracting reserved_blocks from total
> bytes. + +What:		/sys/fs/f2fs/<disk>/encoding_flags
> +Date:		April 2025 +Contact:	"Chao Yu"
> <chao@kernel.org> +Description:	This 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 +
> ===========================      ========== diff --git
> a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c index 3a3485622691..cf98c5cbb98a
> 100644 --- a/fs/f2fs/sysfs.c +++ b/fs/f2fs/sysfs.c @@ -274,6 +274,13
> @@ static ssize_t encoding_show(struct f2fs_attr *a, return
> sysfs_emit(buf, "(none)\n"); }
>  
> +static ssize_t encoding_flags_show(struct f2fs_attr *a, +
> struct f2fs_sb_info *sbi, char *buf) +{ +	return sysfs_emit(buf,
> "%x\n", +
> le16_to_cpu(F2FS_RAW_SUPER(sbi)->s_encoding_flags)); +} + static
> ssize_t mounted_time_sec_show(struct f2fs_attr *a, struct f2fs_sb_info
> *sbi, char *buf) { @@ -1158,6 +1165,7 @@
> F2FS_GENERAL_RO_ATTR(features);
> F2FS_GENERAL_RO_ATTR(current_reserved_blocks);
> F2FS_GENERAL_RO_ATTR(unusable); F2FS_GENERAL_RO_ATTR(encoding);
> +F2FS_GENERAL_RO_ATTR(encoding_flags);
> F2FS_GENERAL_RO_ATTR(mounted_time_sec);
> F2FS_GENERAL_RO_ATTR(main_blkaddr);
> F2FS_GENERAL_RO_ATTR(pending_discard); @@ -1270,6 +1278,7 @@ static
> struct attribute *f2fs_attrs[] = { ATTR_LIST(reserved_blocks),
> ATTR_LIST(current_reserved_blocks), ATTR_LIST(encoding), +
> ATTR_LIST(encoding_flags), ATTR_LIST(mounted_time_sec), #ifdef
> CONFIG_F2FS_STAT_FS ATTR_LIST(cp_foreground_calls), -- 2.49.0
> 

-- 
Lee Jones [李琼斯]

Re: [STABLE 5.15+] f2fs: sysfs: add encoding_flags entry

[Greg Kroah-Hartman]

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@kernel.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

Re: [STABLE 5.15+] f2fs: sysfs: add encoding_flags entry

[Lee Jones]

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@kernel.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]

Re: [STABLE 5.15+] f2fs: sysfs: add encoding_flags entry

[Greg Kroah-Hartman]

On Wed, Jul 23, 2025 at 09:26:39AM +0100, Lee Jones wrote:
> 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@kernel.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.

There are conflicts, it doesn't apply to 6.1.y or 5.15.y :(

thanks,

greg k-h

Re: [STABLE 5.15+] f2fs: sysfs: add encoding_flags entry

[Lee Jones]

On Wed, 23 Jul 2025, Greg Kroah-Hartman wrote:

> On Wed, Jul 23, 2025 at 09:26:39AM +0100, Lee Jones wrote:
> > 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@kernel.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.
> 
> There are conflicts, it doesn't apply to 6.1.y or 5.15.y :(

Okay, thanks for trying.  Leave it with me.

-- 
Lee Jones [李琼斯]