gfs2: use bio op accessors

Separate the op from the rq_flag_bits and have gfs2
set/get the bio using bio_set_op_attrs/bio_op.

Signed-off-by: Mike Christie <mchristi@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

fs/gfs2/log.c

@@ -657,7 +657,7 @@ static void log_write_header(struct gfs2_sbd *sdp, u32 flags)
 	struct gfs2_log_header *lh;
 	unsigned int tail;
 	u32 hash;
-	int rw = WRITE_FLUSH_FUA | REQ_META;
+	int op_flags = WRITE_FLUSH_FUA | REQ_META;
 	struct page *page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
 	enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);
 	lh = page_address(page);
@@ -682,12 +682,12 @@ static void log_write_header(struct gfs2_sbd *sdp, u32 flags)
 	if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags)) {
 		gfs2_ordered_wait(sdp);
 		log_flush_wait(sdp);
-		rw = WRITE_SYNC | REQ_META | REQ_PRIO;
+		op_flags = WRITE_SYNC | REQ_META | REQ_PRIO;
 	}
 
 	sdp->sd_log_idle = (tail == sdp->sd_log_flush_head);
 	gfs2_log_write_page(sdp, page);
-	gfs2_log_flush_bio(sdp, rw);
+	gfs2_log_flush_bio(sdp, REQ_OP_WRITE, op_flags);
 	log_flush_wait(sdp);
 
 	if (sdp->sd_log_tail != tail)
@@ -738,7 +738,7 @@ void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl,
 
 	gfs2_ordered_write(sdp);
 	lops_before_commit(sdp, tr);
-	gfs2_log_flush_bio(sdp, WRITE);
+	gfs2_log_flush_bio(sdp, REQ_OP_WRITE, 0);
 
 	if (sdp->sd_log_head != sdp->sd_log_flush_head) {
 		log_flush_wait(sdp);