linux-kernel - Re: [PATCH -next v4 0/7] md: make rdev addition and removal independent from daemon thread

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Message-ID: <CAPhsuW4rQ1V7EHgfpfx9rL2=pUAcjr+Eint2iD0_EfVAbzcKOQ@mail.gmail.com>
Date:   Thu, 24 Aug 2023 23:39:43 -0700
From:   Song Liu <song@...nel.org>
To:     Yu Kuai <yukuai1@...weicloud.com>
Cc:     xni@...hat.com, linux-raid@...r.kernel.org,
        linux-kernel@...r.kernel.org, yukuai3@...wei.com,
        yi.zhang@...wei.com, yangerkun@...wei.com
Subject: Re: [PATCH -next v4 0/7] md: make rdev addition and removal
 independent from daemon thread

On Thu, Aug 24, 2023 at 8:20 PM Yu Kuai <yukuai1@...weicloud.com> wrote:
>
> From: Yu Kuai <yukuai3@...wei.com>
>
> Changes in v4:
>  - add some review tag;
>  - add comments to make code more readadble for patch 4,6;
>  - rework patch 7 a litter;

Applied v4 to md-next. But this set won't go into 6.6.

Thanks,
Song

>
> Changes in v3:
>  - rename md_choose_sync_direction() to md_choose_sync_action() in patch 2;
>  - fix an error in patch 3;
>  - add flush_work(&mddev->sync_work) while change read-only array to
>  read-write;
>
> Changes in v2:
>  - remove patch 1 from v1 and some related patches, those patches will
>  be sent later when rcu protection for rdev is removed.
>  - add patch 2.
>
> This is the third patchset to do some preparatory work to synchronize
> io with array reconfiguration.
>
> 1) The first patchset refactor 'active_io', make sure that mddev_suspend()
> will wait for io to be done. [1]
>
> 2) The second patchset remove 'quiesce' callback from mddev_suspend(), so
> that mddev_suspend() doesn't rely on 'quiesce' callback is registered,
> and can be used for all personalites; [2]
>
> 3) This patchset make array reconfiguration independent from daemon thread,
> and synchronize it with io will be much easier because io may rely on
> daemon thread to be done.
>
> More patchset on the way!
>
> Yu Kuai (7):
>   md: use separate work_struct for md_start_sync()
>   md: factor out a helper to choose sync action from md_check_recovery()
>   md: delay choosing sync action to md_start_sync()
>   md: factor out a helper rdev_removeable() from remove_and_add_spares()
>   md: factor out a helper rdev_is_spare() from remove_and_add_spares()
>   md: factor out a helper rdev_addable() from remove_and_add_spares()
>   md: delay remove_and_add_spares() for read only array to
>     md_start_sync()
>
>  drivers/md/md.c | 308 +++++++++++++++++++++++++++++++++---------------
>  drivers/md/md.h |   5 +-
>  2 files changed, 218 insertions(+), 95 deletions(-)
>
> --
> 2.39.2
>