linux-kernel - Re: [PATCH v2 04/12] md/raid5: Move common stripe count increment code into __find

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Date:   Wed, 27 Apr 2022 09:33:52 +0800
From:   Guoqing Jiang <guoqing.jiang@...ux.dev>
To:     Logan Gunthorpe <logang@...tatee.com>,
        linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
        Song Liu <song@...nel.org>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Stephen Bates <sbates@...thlin.com>,
        Martin Oliveira <Martin.Oliveira@...eticom.com>,
        David Sloan <David.Sloan@...eticom.com>
Subject: Re: [PATCH v2 04/12] md/raid5: Move common stripe count increment
 code into __find_stripe()



On 4/21/22 3:54 AM, Logan Gunthorpe wrote:
> Both uses of find_stripe() require a fairly complicated dance to
> increment the reference count. Move this into a common find_get_stripe()
> helper.
>
> No functional changes intended.
>
> Signed-off-by: Logan Gunthorpe<logang@...tatee.com>
> ---
>   drivers/md/raid5.c | 133 ++++++++++++++++++++++-----------------------
>   1 file changed, 65 insertions(+), 68 deletions(-)
>
> diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
> index 8e1ece5ce984..a0946af5b1ac 100644
> --- a/drivers/md/raid5.c
> +++ b/drivers/md/raid5.c
> @@ -612,7 +612,7 @@ static void init_stripe(struct stripe_head *sh, sector_t sector, int previous)
>   }

...

>   @@ -624,6 +624,49 @@ static struct stripe_head *__find_stripe(struct r5conf *conf, sector_t sector,
>   	return NULL;
>   }
>   
> +static struct stripe_head *find_get_stripe(struct r5conf *conf,
> +		sector_t sector, short generation, int hash)
> +{

The subject doesn't match the change, maybe something about " md/raid5: 
factor out common stripe count
increment code into find_get_stripe()", just FYI. Otherwise, it 
generally looks good.

Acked-by: Guoqing Jiang <guoqing.jiang@...ux.dev>


Thanks,
Guoqing