This commit introduces a new read-only sysfs entry at /sys/fs/f2fs/<device>/effective_lookup_mode.
This entry displays the actual directory lookup mode F2FS is currently using. This is needed for debugging and verification, as the behavior is determined by both on-disk flags and mount options. Signed-off-by: Daniel Lee <[email protected]> --- v2: - show "auto:perf" or "auto:compat" when lookup_mode is 'auto'. Documentation/ABI/testing/sysfs-fs-f2fs | 15 +++++++++++++++ fs/f2fs/sysfs.c | 18 ++++++++++++++++++ 2 files changed, 33 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs index bc0e7fefc39d..ce189acd1908 100644 --- a/Documentation/ABI/testing/sysfs-fs-f2fs +++ b/Documentation/ABI/testing/sysfs-fs-f2fs @@ -883,3 +883,18 @@ Date: June 2025 Contact: "Daeho Jeong" <[email protected]> Description: Control GC algorithm for boost GC. 0: cost benefit, 1: greedy Default: 1 + +What: /sys/fs/f2fs/<disk>/effective_lookup_mode +Date: August 2025 +Contact: "Daniel Lee" <[email protected]> +Description: + This is a read-only entry to show the effective directory lookup mode + F2FS is currently using for casefolded directories. + This considers both the "lookup_mode" mount option and the on-disk + encoding flag, SB_ENC_NO_COMPAT_FALLBACK_FL. + + Possible values are: + - "perf": Hash-only lookup. + - "compat": Hash-based lookup with a linear search fallback enabled + - "auto:perf": lookup_mode is auto and fallback is disabled on-disk + - "auto:compat": lookup_mode is auto and fallback is enabled on-disk diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c index f736052dea50..82489c78aeda 100644 --- a/fs/f2fs/sysfs.c +++ b/fs/f2fs/sysfs.c @@ -281,6 +281,22 @@ static ssize_t encoding_flags_show(struct f2fs_attr *a, le16_to_cpu(F2FS_RAW_SUPER(sbi)->s_encoding_flags)); } +static ssize_t effective_lookup_mode_show(struct f2fs_attr *a, + struct f2fs_sb_info *sbi, char *buf) +{ + switch (F2FS_OPTION(sbi).lookup_mode) { + case LOOKUP_PERF: + return sysfs_emit(buf, "perf\n"); + case LOOKUP_COMPAT: + return sysfs_emit(buf, "compat\n"); + case LOOKUP_AUTO: + if (sb_no_casefold_compat_fallback(sbi->sb)) + return sysfs_emit(buf, "auto:perf\n"); + return sysfs_emit(buf, "auto:compat\n"); + } + return 0; +} + static ssize_t mounted_time_sec_show(struct f2fs_attr *a, struct f2fs_sb_info *sbi, char *buf) { @@ -1211,6 +1227,7 @@ 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(effective_lookup_mode); F2FS_GENERAL_RO_ATTR(mounted_time_sec); F2FS_GENERAL_RO_ATTR(main_blkaddr); F2FS_GENERAL_RO_ATTR(pending_discard); @@ -1329,6 +1346,7 @@ static struct attribute *f2fs_attrs[] = { ATTR_LIST(current_reserved_blocks), ATTR_LIST(encoding), ATTR_LIST(encoding_flags), + ATTR_LIST(effective_lookup_mode), ATTR_LIST(mounted_time_sec), #ifdef CONFIG_F2FS_STAT_FS ATTR_LIST(cp_foreground_calls), -- 2.50.1.565.gc32cd1483b-goog _______________________________________________ Linux-f2fs-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
