Re: [PATCH md-6.10 3/9] md: add new helpers for sync_action

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On Tue 21 May 2024 at 11:25, Xiao Ni <xni@xxxxxxxxxx> wrote:

On Mon, May 20, 2024 at 8:38 PM Su Yue <l@xxxxxxxxxxx> wrote:


On Thu 09 May 2024 at 09:18, Yu Kuai <yukuai1@xxxxxxxxxxxxxxx>
wrote:

> From: Yu Kuai <yukuai3@xxxxxxxxxx>
>
> The new helpers will get current sync_action of the array, > will
> be used
> in later patches to make code cleaner.
>
> Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
> ---
>  drivers/md/md.c | 64
>  +++++++++++++++++++++++++++++++++++++++++++++++++
>  drivers/md/md.h |  3 +++
>  2 files changed, 67 insertions(+)
>
> diff --git a/drivers/md/md.c b/drivers/md/md.c
> index 00bbafcd27bb..48ec35342d1b 100644
> --- a/drivers/md/md.c
> +++ b/drivers/md/md.c
> @@ -69,6 +69,16 @@
>  #include "md-bitmap.h"
>  #include "md-cluster.h"
>
> +static char *action_name[NR_SYNC_ACTIONS] = {
>

Th array will not be modified, so:

static const char * const action_names[NR_SYNC_ACTIONS]

> +     [ACTION_RESYNC]         = "resync",
> +     [ACTION_RECOVER]        = "recover",
> +     [ACTION_CHECK]          = "check",
> +     [ACTION_REPAIR]         = "repair",
> +     [ACTION_RESHAPE]        = "reshape",
> +     [ACTION_FROZEN]         = "frozen",
> +     [ACTION_IDLE]           = "idle",
> +};
> +
> /* pers_list is a list of registered personalities protected > by
>  pers_lock. */
>  static LIST_HEAD(pers_list);
>  static DEFINE_SPINLOCK(pers_lock);
> @@ -4867,6 +4877,60 @@ metadata_store(struct mddev *mddev, > const
> char *buf, size_t len)
>  static struct md_sysfs_entry md_metadata =
>  __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR,
>  metadata_show, metadata_store);
>
> +enum sync_action md_sync_action(struct mddev *mddev)
> +{
> +     unsigned long recovery = mddev->recovery;
> +
> +     /*
> + * frozen has the highest priority, means running > sync_thread
> will be
> + * stopped immediately, and no new sync_thread can > start.
> +      */
> +     if (test_bit(MD_RECOVERY_FROZEN, &recovery))
> +             return ACTION_FROZEN;
> +
> +     /*
> +      * idle means no sync_thread is running, and no new
> sync_thread is
> +      * requested.
> +      */
> +     if (!test_bit(MD_RECOVERY_RUNNING, &recovery) &&
> + (!md_is_rdwr(mddev) || > !test_bit(MD_RECOVERY_NEEDED,
> &recovery)))
> +             return ACTION_IDLE;
My brain was lost sometimes looking into nested conditions of md
code...

agree+

I agree with Xiao Ni's suggestion that more comments about the
array
state should be added.

In fact, I suggest to keep the logic which is in action_show now. The
logic in action_show is easier to understand for me.


I'm in the middle, either of new/old logic looks good to me ;)
Thanks for clarifying.

--
Su
Best Regards
Xiao

> +     if (test_bit(MD_RECOVERY_RESHAPE, &recovery) ||
> +         mddev->reshape_position != MaxSector)
> +             return ACTION_RESHAPE;
> +
> +     if (test_bit(MD_RECOVERY_RECOVER, &recovery))
> +             return ACTION_RECOVER;
> +
>
In action_show, MD_RECOVERY_SYNC is tested first then
MD_RECOVERY_RECOVER.
After looking through the logic of MD_RECOVERY_RECOVER
clear/set_bit, the
change is fine to me. However, better to follow old pattern unless
there
have resons.


> +     if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
> +             if (test_bit(MD_RECOVERY_CHECK, &recovery))
> +                     return ACTION_CHECK;
> +             if (test_bit(MD_RECOVERY_REQUESTED, &recovery))
> +                     return ACTION_REPAIR;
> +             return ACTION_RESYNC;
> +     }
> +
> +     return ACTION_IDLE;
> +}
> +
> +enum sync_action md_sync_action_by_name(char *page)
> +{
> +     enum sync_action action;
> +
> +     for (action = 0; action < NR_SYNC_ACTIONS; ++action) {
> +             if (cmd_match(page, action_name[action]))
> +                     return action;
> +     }
> +
> +     return NR_SYNC_ACTIONS;
> +}
> +
> +char *md_sync_action_name(enum sync_action action)
>

And 'const char *'

--
Su

> +{
> +     return action_name[action];
> +}
> +
>  static ssize_t
>  action_show(struct mddev *mddev, char *page)
>  {
> diff --git a/drivers/md/md.h b/drivers/md/md.h
> index 2edad966f90a..72ca7a796df5 100644
> --- a/drivers/md/md.h
> +++ b/drivers/md/md.h
> @@ -864,6 +864,9 @@ extern void md_unregister_thread(struct
> mddev *mddev, struct md_thread __rcu **t
> extern void md_wakeup_thread(struct md_thread __rcu > *thread);
>  extern void md_check_recovery(struct mddev *mddev);
>  extern void md_reap_sync_thread(struct mddev *mddev);
> +extern enum sync_action md_sync_action(struct mddev *mddev);
> +extern enum sync_action md_sync_action_by_name(char *page);
> +extern char *md_sync_action_name(enum sync_action action);
>  extern bool md_write_start(struct mddev *mddev, struct bio
>  *bi);
> extern void md_write_inc(struct mddev *mddev, struct bio > *bi);
>  extern void md_write_end(struct mddev *mddev);






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