Re: [PATCH RFC 2/7] md/raid0: convert raid0_handle_discard() to use bio_submit_split()

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To: Yu Kuai <yukuai1@xxxxxxxxxxxxxxx>
Subject: Re: [PATCH RFC 2/7] md/raid0: convert raid0_handle_discard() to use bio_submit_split()
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Mon, 25 Aug 2025 03:57:04 -0700
Cc: hch@xxxxxxxxxxxxx, colyli@xxxxxxxxxx, hare@xxxxxxx, tieren@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx, axboe@xxxxxxxxx, tj@xxxxxxxxxx, josef@xxxxxxxxxxxxxx, song@xxxxxxxxxx, yukuai3@xxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, neil@xxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, cgroups@xxxxxxxxxxxxxxx, linux-raid@xxxxxxxxxxxxxxx, yi.zhang@xxxxxxxxxx, yangerkun@xxxxxxxxxx, johnny.chenyi@xxxxxxxxxx
In-reply-to: <20250825093700.3731633-3-yukuai1@huaweicloud.com>
References: <20250825093700.3731633-1-yukuai1@huaweicloud.com> <20250825093700.3731633-3-yukuai1@huaweicloud.com>

On Mon, Aug 25, 2025 at 05:36:55PM +0800, Yu Kuai wrote:
> +		bio = bio_submit_split(bio,
> +				zone->zone_end - bio->bi_iter.bi_sector,
> +				&mddev->bio_set);

Do you know why raid0 and linear use mddev->bio_set for splitting
instead of their own split bio_sets like raid1/10/5?  Is this safe?

Otherwise this looks nice.

Follow-Ups:
- Re: [PATCH RFC 2/7] md/raid0: convert raid0_handle_discard() to use bio_submit_split()
  - From: Yu Kuai

References:
- [PATCH RFC 0/7] block: fix disordered IO in the case recursive split
  - From: Yu Kuai
- [PATCH RFC 2/7] md/raid0: convert raid0_handle_discard() to use bio_submit_split()
  - From: Yu Kuai

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