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block, drivers, cgroup: use op_is_write helper instead of checking for REQ_WRITE

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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>
This commit is contained in:
Mike Christie
2016-06-05 14:31:45 -05:00
committed by Jens Axboe
parent dfec8a14fc
commit a8ebb056a8
7 changed files with 11 additions and 11 deletions
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2
include/linux/blk-cgroup.h
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@@ -601,7 +601,7 @@ static inline void blkg_rwstat_add(struct blkg_rwstat *rwstat,
{
struct percpu_counter *cnt;
if (rw & REQ_WRITE)
if (op_is_write(rw))
cnt = &rwstat->cpu_cnt[BLKG_RWSTAT_WRITE];
else
cnt = &rwstat->cpu_cnt[BLKG_RWSTAT_READ];