linux-kernel - Re: e827091cb1 "block: merge: get the 1st and last bvec via helpers" broken

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Message-ID: <CACVXFVOJA7=_1DUQm06Qn79xZMQXLob79egnwzOEfVreN2Uopw@mail.gmail.com>
Date:	Sat, 12 Mar 2016 16:49:41 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Kent Overstreet <kent.overstreet@...il.com>
Cc:	Ming Lin <mlin@...nel.org>, Jens Axboe <axboe@...nel.dk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: e827091cb1 "block: merge: get the 1st and last bvec via helpers" broken

On Sat, Mar 12, 2016 at 3:43 PM, Kent Overstreet
<kent.overstreet@...il.com> wrote:
> I don't know exactly how it's broken, but with that patch segment counting is
> broken - I'm seeing blk_rq_map_sg() overrun the end of the sgtable.
>
> I suggest reverting it for 4.5...

Kent, could you share your test case? I'd like to figure out the root cause.

BTW, I don't object to revert it given it is close to v4.5 release, but I am
curious how it breaks segment couting.


Thanks,
Ming Lei