linux-kernel - Re: [PATCH RFC 4/7] md/raid10: convert read/write to use bio_submit

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Message-ID: <aLaPHctB8IgtD_Sg@infradead.org>
Date: Mon, 1 Sep 2025 23:30:53 -0700
From: Christoph Hellwig <hch@...radead.org>
To: John Garry <john.g.garry@...cle.com>
Cc: Christoph Hellwig <hch@...radead.org>,
	anthony <antmbox@...ngman.org.uk>,
	Yu Kuai <yukuai1@...weicloud.com>, 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 4/7] md/raid10: convert read/write to use
 bio_submit_split()

On Tue, Sep 02, 2025 at 07:18:01AM +0100, John Garry wrote:
> BTW, do we realistically expect atomic writes HW support and bad blocks ever
> to meet?

That's the point I'm trying to make.  bad block tracking is stupid
with modern hardware.  Both SSDs and HDDs are overprovisioned on
physical "blocks", and once they run out fine grained bad block tracking
is not going to help.  І really do not understand why md even tries
to do this bad block tracking, but claiming to support atomic writes
while it does is actively harmful.