[PATCH 0/2] use q->prep_rq_fn for flush requests instead of q->prepare_flush_fn()

[FUJITA Tomonori]

scsi-ml builds flush requests via q->prepare_flush_fn(), however,
builds discard requests via q->prep_rq_fn.

Using two different mechnisms for the similar requests (building
commands in SCSI ULD) doesn't make sense.

Handing both via q->prep_rq_fn makes the code simpler.

We could kill q->prepare_flush_fn(). Except for ide, all the users
just mark flush requests. They can use REQ_FLUSH flag instead. Ide can
do like SCSI.

==
 block/blk-barrier.c |   12 ++++--------
 drivers/scsi/sd.c   |   26 ++++++++++++++++----------
 include/linux/bio.h |    2 ++
 3 files changed, 22 insertions(+), 18 deletions(-)
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