Commit 89732017 authored Nov 10, 2025 by Yongpeng Yang Committed by Jaegeuk Kim Dec 04, 2025

f2fs: add a sysfs entry to show max open zones



This patch adds a sysfs entry showing the max zones that F2FS can write
concurrently.

Signed-off-by: Yongpeng Yang <yangyongpeng@xiaomi.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

parent 581251e0

Documentation/ABI/testing/sysfs-fs-f2fs

+6 −0

Original line number	Diff line number	Diff line
		@@ -643,6 +643,12 @@ Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
		Description: Shows the number of unusable blocks in a section which was defined by
		the zone capacity reported by underlying zoned device.

		What: /sys/fs/f2fs/<disk>/max_open_zones
		Date: November 2025
		Contact: "Yongpeng Yang" <yangyongpeng@xiaomi.com>
		Description: Shows the max number of zones that F2FS can write concurrently when a zoned
		device is mounted.

		What: /sys/fs/f2fs/<disk>/current_atomic_write
		Date: July 2022
		Contact: "Daeho Jeong" <daehojeong@google.com>

fs/f2fs/sysfs.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -1213,6 +1213,7 @@ F2FS_SBI_GENERAL_RW_ATTR(last_age_weight);
		F2FS_SBI_GENERAL_RW_ATTR(max_read_extent_count);
		#ifdef CONFIG_BLK_DEV_ZONED
		F2FS_SBI_GENERAL_RO_ATTR(unusable_blocks_per_sec);
		F2FS_SBI_GENERAL_RO_ATTR(max_open_zones);
		F2FS_SBI_GENERAL_RW_ATTR(blkzone_alloc_policy);
		#endif
		F2FS_SBI_GENERAL_RW_ATTR(carve_out);
		@@ -1388,6 +1389,7 @@ static struct attribute *f2fs_attrs[] = {
		#endif
		#ifdef CONFIG_BLK_DEV_ZONED
		ATTR_LIST(unusable_blocks_per_sec),
		ATTR_LIST(max_open_zones),
		ATTR_LIST(blkzone_alloc_policy),
		#endif
		#ifdef CONFIG_F2FS_FS_COMPRESSION