linux-kernel - Re: [BUG] Regression introduced with "block: split bios to max possible length"

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Message-ID: <CACVXFVOjqWqVyO-KbZ1TcWOBSwT=nG4onSuQHW7BOwKKjWGnKQ@mail.gmail.com>
Date:	Sat, 23 Jan 2016 01:48:05 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Keith Busch <keith.busch@...el.com>, Jens Axboe <axboe@...com>,
	Stefan Haberland <sth@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-s390 <linux-s390@...r.kernel.org>,
	Sebastian Ott <sebott@...ux.vnet.ibm.com>
Subject: Re: [BUG] Regression introduced with "block: split bios to max
 possible length"

On Sat, Jan 23, 2016 at 1:03 AM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Fri, Jan 22, 2016 at 7:06 AM, Ming Lei <tom.leiming@...il.com> wrote:
>>
>> Yes, it is one problem, something like below does fix my test
>> with 4K block size.
>
> It just doesn't look very legible.

OK, I will try to make it better.

>
> Also, how could this
>
>> -                       goto split;
>> +                       if (sectors)
>> +                               goto split;
>
> ever matter? If sectors is 0, something is seriously wrong afaik.

I guess that is possible because blk_max_size_offset() depends on
offset and may return a small size which is less than logical
block size.

--
Ming Lei