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

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From	Stefan Haberland <sth@linux.vnet.ibm.com>
Newsgroups	linux.kernel
Subject	[BUG] Regression introduced with "block: split bios to max possible length"
Date	Thu, 21 Jan 2016 16:00:01 +0100
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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

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[BUG] Regression introduced with "block: split bios to max possible  length" Stefan Haberland <sth@linux.vnet.ibm.com> - 2016-01-21 16:00 +0100
  Re: [BUG] Regression introduced with "block: split bios to max  possible length" Jens Axboe <axboe@fb.com> - 2016-01-21 22:40 +0100
    Re: [BUG] Regression introduced with "block: split bios to max  possible length" Keith Busch <keith.busch@intel.com> - 2016-01-22 00:00 +0100
      Re: [BUG] Regression introduced with "block: split bios to max  possible length" Linus Torvalds <torvalds@linux-foundation.org> - 2016-01-22 02:20 +0100
        Re: [BUG] Regression introduced with "block: split bios to max  possible length" Keith Busch <keith.busch@intel.com> - 2016-01-22 04:30 +0100
          Re: [BUG] Regression introduced with "block: split bios to max  possible length" Linus Torvalds <torvalds@linux-foundation.org> - 2016-01-22 05:20 +0100
            Re: [BUG] Regression introduced with "block: split bios to max  possible length" Keith Busch <keith.busch@intel.com> - 2016-01-22 16:00 +0100
              Re: [BUG] Regression introduced with "block: split bios to max  possible length" Jens Axboe <axboe@fb.com> - 2016-01-22 18:20 +0100
            Re: [BUG] Regression introduced with "block: split bios to max  possible length" Ming Lei <tom.leiming@gmail.com> - 2016-01-22 16:10 +0100
              Re: [BUG] Regression introduced with "block: split bios to max  possible length" Linus Torvalds <torvalds@linux-foundation.org> - 2016-01-22 18:10 +0100
                Re: [BUG] Regression introduced with "block: split bios to max  possible length" Ming Lei <tom.leiming@gmail.com> - 2016-01-22 18:50 +0100

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