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 <c...@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" <c...@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
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