linux-kernel - Re: [PATCH md-6.10 1/9] md: rearrange recovery

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Date: Mon, 13 May 2024 17:12:33 +0200
From: Mariusz Tkaczyk <mariusz.tkaczyk@...ux.intel.com>
To: Yu Kuai <yukuai1@...weicloud.com>
Cc: agk@...hat.com, snitzer@...nel.org, mpatocka@...hat.com,
 song@...nel.org, xni@...hat.com, dm-devel@...ts.linux.dev,
 linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
 yukuai3@...wei.com, yi.zhang@...wei.com, yangerkun@...wei.com
Subject: Re: [PATCH md-6.10 1/9] md: rearrange recovery_flage

On Thu,  9 May 2024 09:18:52 +0800
Yu Kuai <yukuai1@...weicloud.com> wrote:

There is typo in subject.

> From: Yu Kuai <yukuai3@...wei.com>
> 
> Currently there are lots of flags and the names are confusing, since
> there are two main types of flags, sync thread runnng status and sync
> thread action, rearrange and update comment to improve code readability,
> there are no functional changes.
> 
> Signed-off-by: Yu Kuai <yukuai3@...wei.com>
> ---
>  drivers/md/md.h | 52 ++++++++++++++++++++++++++++++++++++-------------
>  1 file changed, 38 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/md/md.h b/drivers/md/md.h
> index 029dd0491a36..2a1cb7b889e5 100644
> --- a/drivers/md/md.h
> +++ b/drivers/md/md.h
> @@ -551,22 +551,46 @@ struct mddev {
>  };
>  
>  enum recovery_flags {
> +	/* flags for sync thread running status */
> +
> +	/*
> +	 * set when one of sync action is set and new sync thread need to be
> +	 * registered, or just add/remove spares from conf.
> +	 */
> +	MD_RECOVERY_NEEDED,
> +	/* sync thread is running, or about to be started */
> +	MD_RECOVERY_RUNNING,
> +	/* sync thread needs to be aborted for some reason */
> +	MD_RECOVERY_INTR,
> +	/* sync thread is done and is waiting to be unregistered */
> +	MD_RECOVERY_DONE,
> +	/* running sync thread must abort immediately, and not restart */
> +	MD_RECOVERY_FROZEN,
> +	/* waiting for pers->start() to finish */
> +	MD_RECOVERY_WAIT,
> +	/* interrupted because io-error */
> +	MD_RECOVERY_ERROR,
> +
> +	/* flags determines sync action */
> +
> +	/* if just this flag is set, action is resync. */
> +	MD_RECOVERY_SYNC,
> +	/*
> +	 * paired with MD_RECOVERY_SYNC, if MD_RECOVERY_CHECK is not set,
> +	 * action is repair, means user requested resync.
> +	 */
> +	MD_RECOVERY_REQUESTED,
>  	/*
> -	 * If neither SYNC or RESHAPE are set, then it is a recovery.
> +	 * paired with MD_RECOVERY_SYNC and MD_RECOVERY_REQUESTED, action is
> +	 * check.
>  	 */
> -	MD_RECOVERY_RUNNING,	/* a thread is running, or about to be
> started */
> -	MD_RECOVERY_SYNC,	/* actually doing a resync, not a recovery
> */
> -	MD_RECOVERY_RECOVER,	/* doing recovery, or need to try it. */
> -	MD_RECOVERY_INTR,	/* resync needs to be aborted for some
> reason */
> -	MD_RECOVERY_DONE,	/* thread is done and is waiting to be
> reaped */
> -	MD_RECOVERY_NEEDED,	/* we might need to start a
> resync/recover */
> -	MD_RECOVERY_REQUESTED,	/* user-space has requested a sync
> (used with SYNC) */
> -	MD_RECOVERY_CHECK,	/* user-space request for check-only, no
> repair */
> -	MD_RECOVERY_RESHAPE,	/* A reshape is happening */
> -	MD_RECOVERY_FROZEN,	/* User request to abort, and not
> restart, any action */
> -	MD_RECOVERY_ERROR,	/* sync-action interrupted because
> io-error */
> -	MD_RECOVERY_WAIT,	/* waiting for pers->start() to finish */
> -	MD_RESYNCING_REMOTE,	/* remote node is running resync thread
> */
> +	MD_RECOVERY_CHECK,
> +	/* recovery, or need to try it */
> +	MD_RECOVERY_RECOVER,
> +	/* reshape */
> +	MD_RECOVERY_RESHAPE,
> +	/* remote node is running resync thread */
> +	MD_RESYNCING_REMOTE,
>  };
>  
>  enum md_ro_state {

I don't know if it is better readable but I know that Kernel coding style comes
with different approach. I used it for enum mddev_flags in md.h please take a
look.

Also, I get used to comment above, not below enum values but I don't have strong
justification here.

Thanks,
Mariusz