Re: [PATCH v7 3/4] md/raid0: Move queue limit setup before r0conf initialization

["Yu Kuai" <yukuai@fnnas.com>]

Hi,

在 2025/10/27 15:29, linan122@huawei.com 写道:
> From: Li Nan <linan122@huawei.com>
>
> Prepare for making logical blocksize configurable.
>
> Move raid0_set_limits() before create_strip_zones(). It is safe as fields
> modified in create_strip_zones() do not involve mddev configuration, and
> rdev modifications there are not used in raid0_set_limits().
>
> 'blksize' in create_strip_zones() fetches mddev's logical block size. This
> change has no impact until logical block size becomes configurable.
>
> Signed-off-by: Li Nan <linan122@huawei.com>
> ---
>   drivers/md/raid0.c | 13 +++++++------
>   1 file changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
> index e443e478645a..49477b560cc9 100644
> --- a/drivers/md/raid0.c
> +++ b/drivers/md/raid0.c
> @@ -68,7 +68,7 @@ static int create_strip_zones(struct mddev *mddev, struct r0conf **private_conf)
>   	struct strip_zone *zone;
>   	int cnt;
>   	struct r0conf *conf = kzalloc(sizeof(*conf), GFP_KERNEL);
> -	unsigned blksize = 512;
> +	unsigned int blksize = queue_logical_block_size(mddev->gendisk->queue);
>   
>   	*private_conf = ERR_PTR(-ENOMEM);
>   	if (!conf)

I think the following setting of blksize can be removed as well.

blksize = max(blksize, ...)

Thanks,
Kuai

> @@ -405,6 +405,12 @@ static int raid0_run(struct mddev *mddev)
>   	if (md_check_no_bitmap(mddev))
>   		return -EINVAL;
>   
> +	if (!mddev_is_dm(mddev)) {
> +		ret = raid0_set_limits(mddev);
> +		if (ret)
> +			return ret;
> +	}
> +
>   	/* if private is not null, we are here after takeover */
>   	if (mddev->private == NULL) {
>   		ret = create_strip_zones(mddev, &conf);
> @@ -413,11 +419,6 @@ static int raid0_run(struct mddev *mddev)
>   		mddev->private = conf;
>   	}
>   	conf = mddev->private;
> -	if (!mddev_is_dm(mddev)) {
> -		ret = raid0_set_limits(mddev);
> -		if (ret)
> -			return ret;
> -	}
>   
>   	/* calculate array device size */
>   	md_set_array_sectors(mddev, raid0_size(mddev, 0, 0));