block: use the same failfast bits for bio and request

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bio and request use the same set of failfast bits.  This patch makes
the following changes to simplify things.

* enumify BIO_RW* bits and reorder bits such that BIOS_RW_FAILFAST_*
  bits coincide with __REQ_FAILFAST_* bits.

* The above pushes BIO_RW_AHEAD out of sync with __REQ_FAILFAST_DEV
  but the matching is useless anyway.  init_request_from_bio() is
  responsible for setting FAILFAST bits on FS requests and non-FS
  requests never use BIO_RW_AHEAD.  Drop the code and comment from
  blk_rq_bio_prep().

* Define REQ_FAILFAST_MASK which is OR of all FAILFAST bits and
  simplify FAILFAST flags handling in init_request_from_bio().

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

...

This commit is contained in:

Tejun Heo 2009-07-03 17:48:16 +09:00 • committed by Jens Axboe

parent 0d03d59d9b

commit a82afdfcb8

3 changed files with 34 additions and 32 deletions

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19

block/blk-core.c

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43

include/linux/bio.h

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4

include/linux/blkdev.h

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