block, drivers, cgroup: use op_is_write helper instead of checking for REQ_WRITE
authorMike Christie <mchristi@redhat.com>
Sun, 5 Jun 2016 19:31:45 +0000 (14:31 -0500)
committerJens Axboe <axboe@fb.com>
Tue, 7 Jun 2016 19:41:38 +0000 (13:41 -0600)
commita8ebb056a8aeb58aafef0af241a6b3ac34ac86bd
treea656dfc59d3082470756b7828361eedfce5f49a5
parentdfec8a14fc9043039e3c04807caf39dc71102816
block, drivers, cgroup: use op_is_write helper instead of checking for REQ_WRITE

We currently set REQ_WRITE/WRITE for all non READ IOs
like discard, flush, writesame, etc. In the next patches where we
no longer set up the op as a bitmap, we will not be able to
detect a operation direction like writesame by testing if REQ_WRITE is
set.

This patch converts the drivers and cgroup to use the
op_is_write helper. This should just cover the simple
cases. I did dm, md and bcache in their own patches
because they were more involved.

Signed-off-by: Mike Christie <mchristi@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
block/blk-core.c
block/blk-merge.c
drivers/ata/libata-scsi.c
drivers/block/loop.c
drivers/block/umem.c
drivers/scsi/osd/osd_initiator.c
include/linux/blk-cgroup.h