linux-kernel - Re: [PATCH v2 2/2] md: simplify md_seq

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Date:   Tue, 26 Sep 2023 16:09:38 +0200
From:   Mariusz Tkaczyk <mariusz.tkaczyk@...ux.intel.com>
To:     Yu Kuai <yukuai1@...weicloud.com>
Cc:     xni@...hat.com, song@...nel.org, linux-raid@...r.kernel.org,
        linux-kernel@...r.kernel.org, yukuai3@...wei.com,
        yi.zhang@...wei.com, yangerkun@...wei.com
Subject: Re: [PATCH v2 2/2] md: simplify md_seq_ops

On Tue, 26 Sep 2023 10:58:27 +0800
Yu Kuai <yukuai1@...weicloud.com> wrote:

> From: Yu Kuai <yukuai3@...wei.com>
> 
> Before this patch, the implementation is hacky and hard to understand:
> 
> 1) md_seq_start set pos to 1;
> 2) md_seq_show found pos is 1, then print Personalities;
> 3) md_seq_next found pos is 1, then it update pos to the first mddev;
> 4) md_seq_show found pos is not 1 or 2, show mddev;
> 5) md_seq_next found pos is not 1 or 2, update pos to next mddev;
> 6) loop 4-5 until the last mddev, then md_seq_next update pos to 2;
> 7) md_seq_show found pos is 2, then print unused devices;
> 8) md_seq_next found pos is 2, stop;
> 
> This patch remove the magic value and use seq_list_start/next/stop()
> directly, and move printing "Personalities" to md_sep_start(),
> "unsed devices" to md_seq_stop():

Typo md_sep_start()
> 
> 1) md_seq_start print Personalities, and then set pos to first mddev;
> 2) md_seq_show show mddev;
> 3) md_seq_next update pos to next mddev;
> 4) loop 2-3 until the last mddev;
> 5) md_seq_stop print unsed devices;
> 
> Signed-off-by: Yu Kuai <yukuai3@...wei.com>
> ---
LGTM. Nice one. Code looks much better now.

Reviewed-by: Mariusz Tkaczyk <mariusz.tkaczyk@...ux.intel.com>