Message-ID: <CALTww2-z_YXTfgxxuTH1Qb_dp46sORiG=iD4S=Lh7_RZYqd8yA@mail.gmail.com>
Date: Tue, 14 May 2024 14:39:15 +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, yi.zhang@...wei.com, yangerkun@...wei.com, 
	"yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH md-6.10 1/9] md: rearrange recovery_flage

On Tue, May 14, 2024 at 2:16 PM Yu Kuai <yukuai1@...weicloud.com> wrote:
>
> Hi,
>
> 在 2024/05/14 13:51, Xiao Ni 写道:
> > 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?
>
> There is a typo, I'm not sure what you mean yet. Can you show how you
> add your logs? I think comment is right.

Sorry. I added logs in the wrong places. You're right. Data check has
the three bits. So, the comments are right.


>
>  From action_store:
>
>                  if (cmd_match(page, "check"))
>                          set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
>                  else if (!cmd_match(page, "repair"))
>                          return -EINVAL;
>                  clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
>                  set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
>                  set_bit(MD_RECOVERY_SYNC, &mddev->recovery);

Yes.

Best Regards
Xiao

>
>  From md_do_sync:
>
>          if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
>                  if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
>                          desc = "data-check";
>                          action = "check";
>                  } else if (test_bit(MD_RECOVERY_REQUESTED,
> &mddev->recovery)) {
>                          desc = "requested-resync";
>                          action = "repair";
>                  } else
>                          desc = "resync";
>
> Thanks,
> Kuai
>
> >
> > 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
> >>
> >
> >
> > .
> >
>
>

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