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Commit a4db59ac authored Nov 22, 2019 by Jaegeuk Kim

f2fs: expose main_blkaddr in sysfs



Expose in /sys/fs/f2fs/<blockdev>/main_blkaddr the block address where the
main area starts. This allows user mode programs to determine:

- That pinned files that are made exclusively of fully allocated 2MB
  segments will never be unpinned by the file system.

- Where the main area starts. This is required by programs that want to
  verify if a file is made exclusively of 2MB f2fs segments, the alignment
  boundary for segments starts at this address. Testing for 2MB alignment
  relative to the start of the device is incorrect, because for some
  filesystems main_blkaddr is not at a 2MB boundary relative to the start
  of the device.

The entry will be used when validating reliable pinning file feature proposed
by "f2fs: support aligned pinned file".

Signed-off-by: Ramon Pantin <pantin@google.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

parent 909110c0

Documentation/ABI/testing/sysfs-fs-f2fs

+6 −0

Original line number	Original line	Diff line number	Diff line
	@@ -31,6 +31,12 @@ Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
	Description:		Description:
	Controls the issue rate of segment discard commands.		Controls the issue rate of segment discard commands.

			What: /sys/fs/f2fs/<disk>/max_blkaddr
			Date: November 2019
			Contact: "Ramon Pantin" <pantin@google.com>
			Description:
			Shows first block address of MAIN area.

	What: /sys/fs/f2fs/<disk>/ipu_policy		What: /sys/fs/f2fs/<disk>/ipu_policy
	Date: November 2013		Date: November 2013
	Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>		Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>

Documentation/filesystems/f2fs.txt

+3 −0

Original line number	Original line	Diff line number	Diff line
	@@ -297,6 +297,9 @@ Files in /sys/fs/f2fs/<devname>
	reclaim the prefree segments to free segments.		reclaim the prefree segments to free segments.
	By default, 5% over total # of segments.		By default, 5% over total # of segments.

			main_blkaddr This value gives the first block address of
			MAIN area in the partition.

	max_small_discards This parameter controls the number of discard		max_small_discards This parameter controls the number of discard
	commands that consist small blocks less than 2MB.		commands that consist small blocks less than 2MB.
	The candidates to be discarded are cached until		The candidates to be discarded are cached until

fs/f2fs/sysfs.c

+2 −0

Original line number	Original line	Diff line number	Diff line
	@@ -445,6 +445,7 @@ F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
	F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_idle, gc_mode);		F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_idle, gc_mode);
	F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_urgent, gc_mode);		F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_urgent, gc_mode);
	F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);		F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
			F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, main_blkaddr, main_blkaddr);
	F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, max_small_discards, max_discards);		F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, max_small_discards, max_discards);
	F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, discard_granularity, discard_granularity);		F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, discard_granularity, discard_granularity);
	F2FS_RW_ATTR(RESERVED_BLOCKS, f2fs_sb_info, reserved_blocks, reserved_blocks);		F2FS_RW_ATTR(RESERVED_BLOCKS, f2fs_sb_info, reserved_blocks, reserved_blocks);
	@@ -512,6 +513,7 @@ static struct attribute *f2fs_attrs[] = {
	ATTR_LIST(gc_idle),		ATTR_LIST(gc_idle),
	ATTR_LIST(gc_urgent),		ATTR_LIST(gc_urgent),
	ATTR_LIST(reclaim_segments),		ATTR_LIST(reclaim_segments),
			ATTR_LIST(main_blkaddr),
	ATTR_LIST(max_small_discards),		ATTR_LIST(max_small_discards),
	ATTR_LIST(discard_granularity),		ATTR_LIST(discard_granularity),
	ATTR_LIST(batched_trim_sections),		ATTR_LIST(batched_trim_sections),

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