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

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Date:	Thu, 21 Jan 2016 15:57:14 +0100
From:	Stefan Haberland <sth@...ux.vnet.ibm.com>
To:	keith.busch@...el.com, axboe@...com, torvalds@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
	Sebastian Ott <sebott@...ux.vnet.ibm.com>
Subject: [BUG] Regression introduced with "block: split bios to max possible
 length"

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.

Could you please fix or revert the patch?

We have following values set for the block queue:

hw_sector_size         4096
logical_block_size     4096
minimum_io_size        4096
physical_block_size    4096
max_hw_sectors_kb       760
max_sectors_kb          760
max_segment_size       4096
max_segments          65535

Regards,
Stefan