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block: remove REQ_HARDBARRIER

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REQ_HARDBARRIER is dead now, so remove the leftovers.  What's left
at this point is:

 - various checks inside the block layer.
 - sanity checks in bio based drivers.
 - now unused bio_empty_barrier helper.
 - Xen blockfront use of BLKIF_OP_WRITE_BARRIER - it's dead for a while,
   but Xen really needs to sort out it's barrier situaton.
 - setting of ordered tags in uas - dead code copied from old scsi
   drivers.
 - scsi different retry for barriers - it's dead and should have been
   removed when flushes were converted to FS requests.
 - blktrace handling of barriers - removed.  Someone who knows blktrace
   better should add support for REQ_FLUSH and REQ_FUA, though.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Christoph Hellwig 2010-11-10 14:54:09 +01:00 • committed by Jens Axboe
parent 00e375e7e9
commit 02e031cbc8
11 changed files with 11 additions and 51 deletions
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4
include/linux/bio.h
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@ -66,10 +66,6 @@
#define bio_offset(bio) bio_iovec((bio))->bv_offset
#define bio_segments(bio) ((bio)->bi_vcnt - (bio)->bi_idx)
#define bio_sectors(bio) ((bio)->bi_size >> 9)
#define bio_empty_barrier(bio) \
((bio->bi_rw & REQ_HARDBARRIER) && \
!bio_has_data(bio) && \
!(bio->bi_rw & REQ_DISCARD))
static inline unsigned int bio_cur_bytes(struct bio *bio)
{