linux-kernel - Re: [PATCH 1/5] md/raid5: Refactor raid5_get_active

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Date:   Mon, 01 Aug 2022 08:47:40 -0300
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Song Liu <song@...nel.org>, Christoph Hellwig <hch@...radead.org>
CC:     open list <linux-kernel@...r.kernel.org>,
        linux-raid <linux-raid@...r.kernel.org>,
        Guoqing Jiang <guoqing.jiang@...ux.dev>,
        Stephen Bates <sbates@...thlin.com>,
        Martin Oliveira <Martin.Oliveira@...eticom.com>,
        David Sloan <David.Sloan@...eticom.com>
Subject: Re: [PATCH 1/5] md/raid5: Refactor raid5_get_active_stripe()



On July 29, 2022 7:48:48 PM ADT, Song Liu <song@...nel.org> wrote:
>On Thu, Jul 28, 2022 at 7:13 AM Christoph Hellwig <hch@...radead.org> wrote:
>>
>> On Wed, Jul 27, 2022 at 03:05:56PM -0600, Logan Gunthorpe wrote:
>> > Refactor the raid5_get_active_stripe() to read more linearly in
>> > the order it's typically executed.
>> >
>> > The init_stripe() call is called if a free stripe is found and the
>> > function is exited early which removes a lot of if (sh) checks and
>> > unindents the following code.
>> >
>> > Remove the while loop in favour of the 'goto retry' pattern, which
>> > reduces indentation further. And use a 'goto wait_for_stripe' instead
>> > of an additional indent seeing it is the unusual path and this makes
>> > the code easier to read.
>> >
>> > No functional changes intended. Will make subsequent changes
>> > in patches easier to understand.
>>
>> I find the new loop even more confusing than the old one.  I'd go
>> with something like the version below (on top of the whol md-next tree
>> that pulled this in way too fast..)
>
>This looks good to me. Christoph, would you mind send official patch
>for this?
>
>Thanks,
>Song

I'm on vacation this week, but I'd be happy to send patches addressing Christoph's feedback when I'm back next week.

Thanks,

Logan