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FROMGIT: f2fs: sysfs: add encoding_flags entry

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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

Bug: 410768629
(cherry picked from commit 3fea0641b06ff4e53d95d07a96764d8951d4ced6
https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git dev)
Link: https://lore.kernel.org/linux-f2fs-devel/20250506074725.12315-1-chao@kernel.org
Change-Id: I8a06c81d74278f148c0619fa905989aa75da8719
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
[Chao: Resolved conflicts in sysfs-fs-f2fs ]
Signed-off-by: Lee Jones <joneslee@google.com>
This commit is contained in:
Chao Yu
2025-05-06 15:47:25 +08:00
committed by Lee Jones
parent 229ec4d838
commit feadd4d974
2 changed files with 22 additions and 0 deletions
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13
Documentation/ABI/testing/sysfs-fs-f2fs
View File

@@ -538,3 +538,16 @@ What: /sys/fs/f2fs/<disk>/last_age_weight
Date: January 2023
Contact: "Ping Xiong" <xiongping1@xiaomi.com>
Description: When DATA SEPARATION is on, it controls the weight of last data block age.
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
============================ ==========

9
fs/f2fs/sysfs.c
View File

@@ -213,6 +213,13 @@ static ssize_t encoding_show(struct f2fs_attr *a,
return sprintf(buf, "(none)");
}
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)
{
@@ -756,6 +763,7 @@ 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);
@@ -870,6 +878,7 @@ 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),