linux-kernel - Re: [PATCH AUTOSEL 4.20 42/77] dm: fix clone_bio() to trigger blk_recount

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Date:   Thu, 14 Feb 2019 22:49:09 -0500
From:   Mike Snitzer <snitzer@...hat.com>
To:     Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 4.20 42/77] dm: fix clone_bio() to trigger
 blk_recount_segments()

On Thu, Feb 14 2019 at  9:08pm -0500,
Sasha Levin <sashal@...nel.org> wrote:

> From: Mike Snitzer <snitzer@...hat.com>
> 
> [ Upstream commit 57c36519e4b949f89381053f7283f5d605595b42 ]
> 
> DM's clone_bio() now benefits from using bio_trim() by fixing the fact
> that clone_bio() wasn't clearing BIO_SEG_VALID like bio_trim() does;
> which triggers blk_recount_segments() via bio_phys_segments().
> 
> Reviewed-by: Ming Lei <ming.lei@...hat.com>
> Signed-off-by: Mike Snitzer <snitzer@...hat.com>
> Signed-off-by: Sasha Levin <sashal@...nel.org>

Please no, I later effectively reverted this change with commit
fa8db4948f522 ("dm: don't use bio_trim() afterall")

(As and aside, I really shouldn't have to defend against stable@ bots
picking up a commit, like 57c36519e4b949f, that wasn't marked for
stable@.)