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

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Message-ID: <56A14EE4.1020008@fb.com>
Date:	Thu, 21 Jan 2016 14:34:28 -0700
From:	Jens Axboe <axboe@...com>
To:	Stefan Haberland <sth@...ux.vnet.ibm.com>, <keith.busch@...el.com>,
	<torvalds@...ux-foundation.org>
CC:	<linux-kernel@...r.kernel.org>, <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 01/21/2016 07:57 AM, Stefan Haberland wrote:
> Hi,
>
> unfortunately commit e36f62042880 "block: split bios to maxpossible length"
> breaks the DASD driver on s390.  We expect the block requests to be
> multiple
> of 4k in size. With the patch applied I see the requests split up in
> multiple
> of 512 byte and therefore the requests get rejected and lots of I/Os fail.

Sigh, that's definitely a bug. I'll take a look at it and see if I can 
get a tested fix in for 4.5-rc1. If not, we'll revert it, again.


-- 
Jens Axboe