Commit f196d728 authored by Yu Kuai's avatar Yu Kuai
Browse files

md/md-bitmap: add a new method skip_sync_blocks() in bitmap_operations 

This method is used to check if blocks can be skipped before calling
into pers->sync_request(), llbitmap will use this method to skip
resync for unwritten/clean data blocks, and recovery/check/repair for
unwritten data blocks;

Link: https://lore.kernel.org/linux-raid/20250829080426.1441678-8-yukuai1@huaweicloud.com


Signed-off-by: default avatarYu Kuai <yukuai3@huawei.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarXiao Ni <xni@redhat.com>
Reviewed-by: default avatarHannes Reinecke <hare@suse.de>
Reviewed-by: default avatarLi Nan <linan122@huawei.com>
parent fb8cc3b0

drivers/md/md-bitmap.h

+1 −0
Original line number Diff line number Diff line
@@ -89,6 +89,7 @@ struct bitmap_operations { 
	md_bitmap_fn *start_discard;

	md_bitmap_fn *end_discard;



	sector_t (*skip_sync_blocks)(struct mddev *mddev, sector_t offset);

	bool (*start_sync)(struct mddev *mddev, sector_t offset,

			   sector_t *blocks, bool degraded);

	void (*end_sync)(struct mddev *mddev, sector_t offset, sector_t *blocks);

drivers/md/md.c

+7 −0
Original line number Diff line number Diff line
@@ -9460,6 +9460,12 @@ void md_do_sync(struct md_thread *thread) 
		if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))

			break;



		if (mddev->bitmap_ops && mddev->bitmap_ops->skip_sync_blocks) {

			sectors = mddev->bitmap_ops->skip_sync_blocks(mddev, j);

			if (sectors)

				goto update;

		}



		sectors = mddev->pers->sync_request(mddev, j, max_sectors,

						    &skipped);

		if (sectors == 0) {
@@ -9475,6 +9481,7 @@ void md_do_sync(struct md_thread *thread) 
		if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))

			break;



update:

		j += sectors;

		if (j > max_sectors)

			/* when skipping, extra large numbers can be returned. */