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

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Date: Tue, 14 May 2024 13:51:08 +0800
From: Xiao Ni <xni@...hat.com>
To: Yu Kuai <yukuai1@...weicloud.com>
Cc: agk@...hat.com, snitzer@...nel.org, mpatocka@...hat.com, song@...nel.org, 
	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 Mon, May 13, 2024 at 9:57 AM Yu Kuai <yukuai1@...weicloud.com> wrote:
>
> 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.

Hi Kuai

I did a test as follows:

echo check > /sys/block/md0/md/sync_action
I added some logs in md_do_sync to check these bits. It only prints
MD_RECOVERY_SYNC and MD_RECOVERY_CHECK without MD_RECOVERY_SYNC. So
the comment is not right?

Best Regards
Xiao

>          */
> -       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 {
> --
> 2.39.2
>