linux-kernel - Re: [PATCH RFC 5/7] md/raid5: convert to use bio_submit

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Message-ID: <aK1oksF1icAVAQjp@infradead.org>
Date: Tue, 26 Aug 2025 00:56:02 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Yu Kuai <yukuai1@...weicloud.com>
Cc: Christoph Hellwig <hch@...radead.org>, colyli@...nel.org, hare@...e.de,
	tieren@...as.com, axboe@...nel.dk, tj@...nel.org,
	josef@...icpanda.com, song@...nel.org, akpm@...ux-foundation.org,
	neil@...wn.name, linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	linux-raid@...r.kernel.org, yi.zhang@...wei.com,
	yangerkun@...wei.com, johnny.chenyi@...wei.com,
	"yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH RFC 5/7] md/raid5: convert to use bio_submit_split()

On Tue, Aug 26, 2025 at 09:15:34AM +0800, Yu Kuai wrote:
> > > +		raid_bio->bi_opf &= ~REQ_NOMERGE;
> > 
> > It almost feels as if md wants a little helper that wraps
> > bio_submit_split and also clears REQ_NOMERGE?
> > 
> 
> Yes.
> 
> And with the respect bio_submit_split() set this flag and then we clear
> it, will it make more sense to set this flag after bio_submit_split()
> from block layer?

Yes.