Re: [PATCH RFC md-6.16 v3 07/19] md/md-bitmap: add a new helper skip_sync_blocks() in bitmap_operations

[Xiao Ni <xni@redhat.com>]

在 2025/5/12 上午9:19, Yu Kuai 写道:
> From: Yu Kuai <yukuai3@huawei.com>
>
> This helper is used to check if blocks can be skipped before calling
> into pers->sync_request(), llbiltmap will use this helper to skip


typo error s/llbiltmap/llbitmap/g

> resync for unwritten/clean data blocks, and recovery/check/repair for
> unwritten data blocks;
>
> Signed-off-by: Yu Kuai <yukuai3@huawei.com>
> ---
>   drivers/md/md-bitmap.h | 1 +
>   drivers/md/md.c        | 7 +++++++
>   2 files changed, 8 insertions(+)
>
> diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
> index 41d09c6d0c14..13be2a10801a 100644
> --- a/drivers/md/md-bitmap.h
> +++ b/drivers/md/md-bitmap.h
> @@ -99,6 +99,7 @@ struct bitmap_operations {
>   	void (*end_discard)(struct mddev *mddev, sector_t offset,
>   			    unsigned long sectors);
>   
> +	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);
> diff --git a/drivers/md/md.c b/drivers/md/md.c
> index 4329ecfbe8ff..c23ee9c19cf9 100644
> --- a/drivers/md/md.c
> +++ b/drivers/md/md.c
> @@ -9370,6 +9370,12 @@ 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) {
> @@ -9385,6 +9391,7 @@ 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. */