rbd: drop flags parameter from rbd_req_sync_exec()

All callers of rbd_req_sync_exec() pass CEPH_OSD_FLAG_READ as their
flags argument.  Delete that parameter and use CEPH_OSD_FLAG_READ
within the function.  If we find a need to support write operations
we can add it back again.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>

drivers/block/rbd.c

@@ -1524,7 +1524,6 @@ static int rbd_req_sync_exec(struct rbd_device *rbd_dev,
 			     size_t outbound_size,
 			     char *inbound,
 			     size_t inbound_size,
-			     int flags,
 			     u64 *ver)
 {
 	struct ceph_osd_req_op *ops;
@@ -1555,8 +1554,7 @@ static int rbd_req_sync_exec(struct rbd_device *rbd_dev,
 	ops[0].cls.indata_len = outbound_size;
 
 	ret = rbd_req_sync_op(rbd_dev, NULL,
-			       CEPH_NOSNAP,
-			       flags, ops,
+			       CEPH_NOSNAP, CEPH_OSD_FLAG_READ, ops,
 			       object_name, 0, inbound_size, inbound,
 			       NULL, ver);
 
@@ -2418,8 +2416,7 @@ static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id,
 	ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name,
 				"rbd", "get_size",
 				(char *) &snapid, sizeof (snapid),
-				(char *) &size_buf, sizeof (size_buf),
-				CEPH_OSD_FLAG_READ, NULL);
+				(char *) &size_buf, sizeof (size_buf), NULL);
 	dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret);
 	if (ret < 0)
 		return ret;
@@ -2454,8 +2451,7 @@ static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev)
 	ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name,
 				"rbd", "get_object_prefix",
 				NULL, 0,
-				reply_buf, RBD_OBJ_PREFIX_LEN_MAX,
-				CEPH_OSD_FLAG_READ, NULL);
+				reply_buf, RBD_OBJ_PREFIX_LEN_MAX, NULL);
 	dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret);
 	if (ret < 0)
 		goto out;
@@ -2494,7 +2490,7 @@ static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id,
 				"rbd", "get_features",
 				(char *) &snapid, sizeof (snapid),
 				(char *) &features_buf, sizeof (features_buf),
-				CEPH_OSD_FLAG_READ, NULL);
+				NULL);
 	dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret);
 	if (ret < 0)
 		return ret;
@@ -2549,8 +2545,7 @@ static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev)
 	ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name,
 				"rbd", "get_parent",
 				(char *) &snapid, sizeof (snapid),
-				(char *) reply_buf, size,
-				CEPH_OSD_FLAG_READ, NULL);
+				(char *) reply_buf, size, NULL);
 	dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret);
 	if (ret < 0)
 		goto out_err;
@@ -2615,8 +2610,7 @@ static char *rbd_dev_image_name(struct rbd_device *rbd_dev)
 	ret = rbd_req_sync_exec(rbd_dev, RBD_DIRECTORY,
 				"rbd", "dir_get_name",
 				image_id, image_id_size,
-				(char *) reply_buf, size,
-				CEPH_OSD_FLAG_READ, NULL);
+				(char *) reply_buf, size, NULL);
 	if (ret < 0)
 		goto out;
 	p = reply_buf;
@@ -2722,8 +2716,7 @@ static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev, u64 *ver)
 	ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name,
 				"rbd", "get_snapcontext",
 				NULL, 0,
-				reply_buf, size,
-				CEPH_OSD_FLAG_READ, ver);
+				reply_buf, size, ver);
 	dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret);
 	if (ret < 0)
 		goto out;
@@ -2792,8 +2785,7 @@ static char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, u32 which)
 	ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name,
 				"rbd", "get_snapshot_name",
 				(char *) &snap_id, sizeof (snap_id),
-				reply_buf, size,
-				CEPH_OSD_FLAG_READ, NULL);
+				reply_buf, size, NULL);
 	dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret);
 	if (ret < 0)
 		goto out;
@@ -3401,8 +3393,7 @@ static int rbd_dev_image_id(struct rbd_device *rbd_dev)
 	ret = rbd_req_sync_exec(rbd_dev, object_name,
 				"rbd", "get_id",
 				NULL, 0,
-				response, RBD_IMAGE_ID_LEN_MAX,
-				CEPH_OSD_FLAG_READ, NULL);
+				response, RBD_IMAGE_ID_LEN_MAX, NULL);
 	dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret);
 	if (ret < 0)
 		goto out;