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

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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: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Xiao Ni <xni@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Li Nan <linan122@huawei.com>
This commit is contained in:
Yu Kuai 2025-08-29 16:04:22 +08:00
parent fb8cc3b0d9
commit f196d72888
2 changed files with 8 additions and 0 deletions
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1
drivers/md/md-bitmap.h
View File

@ -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);

7
drivers/md/md.c
View File

@ -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. */