linux-kernel - Re: [PATCH v2 01/11] md: merge mddev has_superblock into mddev

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Message-ID: <223a9fac-243d-9ba5-e7da-03999f0a1c75@huaweicloud.com>
Date: Fri, 26 Dec 2025 11:04:32 +0800
From: Li Nan <linan666@...weicloud.com>
To: Yu Kuai <yukuai@...as.com>, song@...nel.org, linux-raid@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, filippo@...ian.org, colyli@...as.com
Subject: Re: [PATCH v2 01/11] md: merge mddev has_superblock into mddev_flags



在 2025/11/24 14:31, Yu Kuai 写道:
> There is not need to use a separate field in struct mddev, there are no
> functional changes.
> 
> Signed-off-by: Yu Kuai <yukuai@...as.com>
> ---
>   drivers/md/md.c | 6 +++---
>   drivers/md/md.h | 3 ++-
>   2 files changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/md/md.c b/drivers/md/md.c
> index 7b5c5967568f..b49fdee11a03 100644
> --- a/drivers/md/md.c
> +++ b/drivers/md/md.c
> @@ -6462,7 +6462,7 @@ int md_run(struct mddev *mddev)
>   	 * the only valid external interface is through the md
>   	 * device.
>   	 */
> -	mddev->has_superblocks = false;
> +	clear_bit(MD_HAS_SUPERBLOCK, &mddev->flags);
>   	rdev_for_each(rdev, mddev) {
>   		if (test_bit(Faulty, &rdev->flags))
>   			continue;
> @@ -6475,7 +6475,7 @@ int md_run(struct mddev *mddev)
>   		}
>   
>   		if (rdev->sb_page)
> -			mddev->has_superblocks = true;
> +			set_bit(MD_HAS_SUPERBLOCK, &mddev->flags);
>   
>   		/* perform some consistency tests on the device.
>   		 * We don't want the data to overlap the metadata,
> @@ -9085,7 +9085,7 @@ void md_write_start(struct mddev *mddev, struct bio *bi)
>   	rcu_read_unlock();
>   	if (did_change)
>   		sysfs_notify_dirent_safe(mddev->sysfs_state);
> -	if (!mddev->has_superblocks)
> +	if (!test_bit(MD_HAS_SUPERBLOCK, &mddev->flags))
>   		return;
>   	wait_event(mddev->sb_wait,
>   		   !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
> diff --git a/drivers/md/md.h b/drivers/md/md.h
> index 6985f2829bbd..b4c9aa600edd 100644
> --- a/drivers/md/md.h
> +++ b/drivers/md/md.h
> @@ -340,6 +340,7 @@ struct md_cluster_operations;
>    *		   array is ready yet.
>    * @MD_BROKEN: This is used to stop writes and mark array as failed.
>    * @MD_DELETED: This device is being deleted
> + * @MD_HAS_SUPERBLOCK: There is persistence sb in member disks.
>    *
>    * change UNSUPPORTED_MDDEV_FLAGS for each array type if new flag is added
>    */
> @@ -356,6 +357,7 @@ enum mddev_flags {
>   	MD_BROKEN,
>   	MD_DO_DELETE,
>   	MD_DELETED,
> +	MD_HAS_SUPERBLOCK,
>   };
>   
>   enum mddev_sb_flags {
> @@ -623,7 +625,6 @@ struct mddev {
>   	/* The sequence number for sync thread */
>   	atomic_t sync_seq;
>   
> -	bool	has_superblocks:1;
>   	bool	fail_last_dev:1;
>   	bool	serialize_policy:1;
>   };

LGTM

Reviewed-by: Li Nan <linan122@...wei.com>


-- 
Thanks,
Nan