libceph: don't set flags in ceph_osdc_alloc_request()

The only thing ceph_osdc_alloc_request() really does with the
flags value it is passed is assign it to the newly-created
osd request structure.  Do that in the caller instead.

Both callers subsequently call ceph_osdc_build_request(), so have
that function (instead of ceph_osdc_alloc_request()) issue a warning
if a request comes through with neither the read nor write flags set.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>

drivers/block/rbd.c

@@ -1148,13 +1148,14 @@ static int rbd_do_request(struct request *rq,
 		(unsigned long long) len, coll, coll_index);
 
 	osdc = &rbd_dev->rbd_client->client->osdc;
-	osd_req = ceph_osdc_alloc_request(osdc, flags, snapc, ops,
+	osd_req = ceph_osdc_alloc_request(osdc, snapc, ops,
 					false, GFP_NOIO, pages, bio);
 	if (!osd_req) {
 		ret = -ENOMEM;
 		goto done_pages;
 	}
 
+	osd_req->r_flags = flags;
 	osd_req->r_callback = rbd_cb;
 
 	rbd_req->rq = rq;

include/linux/ceph/osd_client.h

@@ -213,7 +213,6 @@ extern int ceph_calc_raw_layout(struct ceph_file_layout *layout,
 			struct ceph_osd_req_op *op);
 
 extern struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
-					       int flags,
 					       struct ceph_snap_context *snapc,
 					       struct ceph_osd_req_op *ops,
 					       bool use_mempool,

net/ceph/osd_client.c

@@ -171,7 +171,6 @@ static int get_num_ops(struct ceph_osd_req_op *ops)
 }
 
 struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
-					       int flags,
 					       struct ceph_snap_context *snapc,
 					       struct ceph_osd_req_op *ops,
 					       bool use_mempool,
@@ -208,10 +207,6 @@ struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
 	INIT_LIST_HEAD(&req->r_req_lru_item);
 	INIT_LIST_HEAD(&req->r_osd_item);
 
-	req->r_flags = flags;
-
-	WARN_ON((flags & (CEPH_OSD_FLAG_READ|CEPH_OSD_FLAG_WRITE)) == 0);
-
 	/* create reply message */
 	if (use_mempool)
 		msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
@@ -347,6 +342,8 @@ void ceph_osdc_build_request(struct ceph_osd_request *req,
 	u64 data_len = 0;
 	int i;
 
+	WARN_ON((flags & (CEPH_OSD_FLAG_READ|CEPH_OSD_FLAG_WRITE)) == 0);
+
 	head = msg->front.iov_base;
 	head->snapid = cpu_to_le64(snap_id);
 	op = (void *)(head + 1);
@@ -442,12 +439,12 @@ struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
 	} else
 		ops[1].op = 0;
 
-	req = ceph_osdc_alloc_request(osdc, flags,
-					 snapc, ops,
+	req = ceph_osdc_alloc_request(osdc, snapc, ops,
 					 use_mempool,
 					 GFP_NOFS, NULL, NULL);
 	if (!req)
 		return ERR_PTR(-ENOMEM);
+	req->r_flags = flags;
 
 	/* calculate max write size */
 	r = calc_layout(vino, layout, off, plen, req, ops);