rbd: use rbd_dev consistently

Most variables that represent a struct rbd_device are named
"rbd_dev", but in some cases "dev" is used instead.  Change all the
"dev" references so they use "rbd_dev" consistently, to make it
clear from the name that we're working with an RBD device (as
opposed to, for example, a struct device).  Similarly, change the
name of the "dev" field in struct rbd_notify_info to be "rbd_dev".

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

drivers/block/rbd.c

@@ -582,35 +582,36 @@ static int snap_by_name(struct rbd_image_header *header, const char *snap_name,
 	return -ENOENT;
 }
 
-static int rbd_header_set_snap(struct rbd_device *dev, u64 *size)
+static int rbd_header_set_snap(struct rbd_device *rbd_dev, u64 *size)
 {
-	struct rbd_image_header *header = &dev->header;
+	struct rbd_image_header *header = &rbd_dev->header;
 	struct ceph_snap_context *snapc = header->snapc;
 	int ret = -ENOENT;
 
-	down_write(&dev->header_rwsem);
+	down_write(&rbd_dev->header_rwsem);
 
-	if (!memcmp(dev->snap_name, RBD_SNAP_HEAD_NAME,
+	if (!memcmp(rbd_dev->snap_name, RBD_SNAP_HEAD_NAME,
 		    sizeof (RBD_SNAP_HEAD_NAME))) {
 		if (header->total_snaps)
 			snapc->seq = header->snap_seq;
 		else
 			snapc->seq = 0;
-		dev->snap_id = CEPH_NOSNAP;
-		dev->read_only = 0;
+		rbd_dev->snap_id = CEPH_NOSNAP;
+		rbd_dev->read_only = 0;
 		if (size)
 			*size = header->image_size;
 	} else {
-		ret = snap_by_name(header, dev->snap_name, &snapc->seq, size);
+		ret = snap_by_name(header, rbd_dev->snap_name,
+					&snapc->seq, size);
 		if (ret < 0)
 			goto done;
-		dev->snap_id = snapc->seq;
-		dev->read_only = 1;
+		rbd_dev->snap_id = snapc->seq;
+		rbd_dev->read_only = 1;
 	}
 
 	ret = 0;
 done:
-	up_write(&dev->header_rwsem);
+	up_write(&rbd_dev->header_rwsem);
 	return ret;
 }
 
@@ -854,7 +855,7 @@ static void rbd_coll_end_req(struct rbd_request *req,
  * Send ceph osd request
  */
 static int rbd_do_request(struct request *rq,
-			  struct rbd_device *dev,
+			  struct rbd_device *rbd_dev,
 			  struct ceph_snap_context *snapc,
 			  u64 snapid,
 			  const char *obj, u64 ofs, u64 len,
@@ -895,13 +896,13 @@ static int rbd_do_request(struct request *rq,
 
 	dout("rbd_do_request obj=%s ofs=%lld len=%lld\n", obj, len, ofs);
 
-	down_read(&dev->header_rwsem);
+	down_read(&rbd_dev->header_rwsem);
 
-	osdc = &dev->rbd_client->client->osdc;
+	osdc = &rbd_dev->rbd_client->client->osdc;
 	req = ceph_osdc_alloc_request(osdc, flags, snapc, ops,
 					false, GFP_NOIO, pages, bio);
 	if (!req) {
-		up_read(&dev->header_rwsem);
+		up_read(&rbd_dev->header_rwsem);
 		ret = -ENOMEM;
 		goto done_pages;
 	}
@@ -926,7 +927,7 @@ static int rbd_do_request(struct request *rq,
 	layout->fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER);
 	layout->fl_stripe_count = cpu_to_le32(1);
 	layout->fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER);
-	layout->fl_pg_pool = cpu_to_le32(dev->pool_id);
+	layout->fl_pg_pool = cpu_to_le32(rbd_dev->pool_id);
 	ceph_calc_raw_layout(osdc, layout, snapid, ofs, &len, &bno,
 				req, ops);
 
@@ -935,7 +936,7 @@ static int rbd_do_request(struct request *rq,
 				snapc,
 				&mtime,
 				req->r_oid, req->r_oid_len);
-	up_read(&dev->header_rwsem);
+	up_read(&rbd_dev->header_rwsem);
 
 	if (linger_req) {
 		ceph_osdc_set_request_linger(osdc, req);
@@ -1012,7 +1013,7 @@ static void rbd_simple_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg
 /*
  * Do a synchronous ceph osd operation
  */
-static int rbd_req_sync_op(struct rbd_device *dev,
+static int rbd_req_sync_op(struct rbd_device *rbd_dev,
 			   struct ceph_snap_context *snapc,
 			   u64 snapid,
 			   int opcode,
@@ -1049,7 +1050,7 @@ static int rbd_req_sync_op(struct rbd_device *dev,
 		}
 	}
 
-	ret = rbd_do_request(NULL, dev, snapc, snapid,
+	ret = rbd_do_request(NULL, rbd_dev, snapc, snapid,
 			  obj, ofs, len, NULL,
 			  pages, num_pages,
 			  flags,
@@ -1076,7 +1077,7 @@ done:
  * Do an asynchronous ceph osd operation
  */
 static int rbd_do_op(struct request *rq,
-		     struct rbd_device *rbd_dev ,
+		     struct rbd_device *rbd_dev,
 		     struct ceph_snap_context *snapc,
 		     u64 snapid,
 		     int opcode, int flags, int num_reply,
@@ -1168,7 +1169,7 @@ static int rbd_req_read(struct request *rq,
 /*
  * Request sync osd read
  */
-static int rbd_req_sync_read(struct rbd_device *dev,
+static int rbd_req_sync_read(struct rbd_device *rbd_dev,
 			  struct ceph_snap_context *snapc,
 			  u64 snapid,
 			  const char *obj,
@@ -1176,7 +1177,7 @@ static int rbd_req_sync_read(struct rbd_device *dev,
 			  char *buf,
 			  u64 *ver)
 {
-	return rbd_req_sync_op(dev, NULL,
+	return rbd_req_sync_op(rbd_dev, NULL,
 			       snapid,
 			       CEPH_OSD_OP_READ,
 			       CEPH_OSD_FLAG_READ,
@@ -1187,7 +1188,7 @@ static int rbd_req_sync_read(struct rbd_device *dev,
 /*
  * Request sync osd watch
  */
-static int rbd_req_sync_notify_ack(struct rbd_device *dev,
+static int rbd_req_sync_notify_ack(struct rbd_device *rbd_dev,
 				   u64 ver,
 				   u64 notify_id,
 				   const char *obj)
@@ -1199,11 +1200,11 @@ static int rbd_req_sync_notify_ack(struct rbd_device *dev,
 	if (ret < 0)
 		return ret;
 
-	ops[0].watch.ver = cpu_to_le64(dev->header.obj_version);
+	ops[0].watch.ver = cpu_to_le64(rbd_dev->header.obj_version);
 	ops[0].watch.cookie = notify_id;
 	ops[0].watch.flag = 0;
 
-	ret = rbd_do_request(NULL, dev, NULL, CEPH_NOSNAP,
+	ret = rbd_do_request(NULL, rbd_dev, NULL, CEPH_NOSNAP,
 			  obj, 0, 0, NULL,
 			  NULL, 0,
 			  CEPH_OSD_FLAG_READ,
@@ -1218,54 +1219,54 @@ static int rbd_req_sync_notify_ack(struct rbd_device *dev,
 
 static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data)
 {
-	struct rbd_device *dev = (struct rbd_device *)data;
+	struct rbd_device *rbd_dev = (struct rbd_device *)data;
 	int rc;
 
-	if (!dev)
+	if (!rbd_dev)
 		return;
 
-	dout("rbd_watch_cb %s notify_id=%lld opcode=%d\n", dev->obj_md_name,
+	dout("rbd_watch_cb %s notify_id=%lld opcode=%d\n", rbd_dev->obj_md_name,
 		notify_id, (int)opcode);
 	mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
-	rc = __rbd_refresh_header(dev);
+	rc = __rbd_refresh_header(rbd_dev);
 	mutex_unlock(&ctl_mutex);
 	if (rc)
 		pr_warning(RBD_DRV_NAME "%d got notification but failed to "
-			   " update snaps: %d\n", dev->major, rc);
+			   " update snaps: %d\n", rbd_dev->major, rc);
 
-	rbd_req_sync_notify_ack(dev, ver, notify_id, dev->obj_md_name);
+	rbd_req_sync_notify_ack(rbd_dev, ver, notify_id, rbd_dev->obj_md_name);
 }
 
 /*
  * Request sync osd watch
  */
-static int rbd_req_sync_watch(struct rbd_device *dev,
+static int rbd_req_sync_watch(struct rbd_device *rbd_dev,
 			      const char *obj,
 			      u64 ver)
 {
 	struct ceph_osd_req_op *ops;
-	struct ceph_osd_client *osdc = &dev->rbd_client->client->osdc;
+	struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
 
 	int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_WATCH, 0);
 	if (ret < 0)
 		return ret;
 
 	ret = ceph_osdc_create_event(osdc, rbd_watch_cb, 0,
-				     (void *)dev, &dev->watch_event);
+				     (void *)rbd_dev, &rbd_dev->watch_event);
 	if (ret < 0)
 		goto fail;
 
 	ops[0].watch.ver = cpu_to_le64(ver);
-	ops[0].watch.cookie = cpu_to_le64(dev->watch_event->cookie);
+	ops[0].watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie);
 	ops[0].watch.flag = 1;
 
-	ret = rbd_req_sync_op(dev, NULL,
+	ret = rbd_req_sync_op(rbd_dev, NULL,
 			      CEPH_NOSNAP,
 			      0,
 			      CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK,
 			      ops,
 			      1, obj, 0, 0, NULL,
-			      &dev->watch_request, NULL);
+			      &rbd_dev->watch_request, NULL);
 
 	if (ret < 0)
 		goto fail_event;
@@ -1274,8 +1275,8 @@ static int rbd_req_sync_watch(struct rbd_device *dev,
 	return 0;
 
 fail_event:
-	ceph_osdc_cancel_event(dev->watch_event);
-	dev->watch_event = NULL;
+	ceph_osdc_cancel_event(rbd_dev->watch_event);
+	rbd_dev->watch_event = NULL;
 fail:
 	rbd_destroy_ops(ops);
 	return ret;
@@ -1284,7 +1285,7 @@ fail:
 /*
  * Request sync osd unwatch
  */
-static int rbd_req_sync_unwatch(struct rbd_device *dev,
+static int rbd_req_sync_unwatch(struct rbd_device *rbd_dev,
 				const char *obj)
 {
 	struct ceph_osd_req_op *ops;
@@ -1294,10 +1295,10 @@ static int rbd_req_sync_unwatch(struct rbd_device *dev,
 		return ret;
 
 	ops[0].watch.ver = 0;
-	ops[0].watch.cookie = cpu_to_le64(dev->watch_event->cookie);
+	ops[0].watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie);
 	ops[0].watch.flag = 0;
 
-	ret = rbd_req_sync_op(dev, NULL,
+	ret = rbd_req_sync_op(rbd_dev, NULL,
 			      CEPH_NOSNAP,
 			      0,
 			      CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK,
@@ -1305,33 +1306,34 @@ static int rbd_req_sync_unwatch(struct rbd_device *dev,
 			      1, obj, 0, 0, NULL, NULL, NULL);
 
 	rbd_destroy_ops(ops);
-	ceph_osdc_cancel_event(dev->watch_event);
-	dev->watch_event = NULL;
+	ceph_osdc_cancel_event(rbd_dev->watch_event);
+	rbd_dev->watch_event = NULL;
 	return ret;
 }
 
 struct rbd_notify_info {
-	struct rbd_device *dev;
+	struct rbd_device *rbd_dev;
 };
 
 static void rbd_notify_cb(u64 ver, u64 notify_id, u8 opcode, void *data)
 {
-	struct rbd_device *dev = (struct rbd_device *)data;
-	if (!dev)
+	struct rbd_device *rbd_dev = (struct rbd_device *)data;
+	if (!rbd_dev)
 		return;
 
-	dout("rbd_notify_cb %s notify_id=%lld opcode=%d\n", dev->obj_md_name,
+	dout("rbd_notify_cb %s notify_id=%lld opcode=%d\n",
+				rbd_dev->obj_md_name,
 		notify_id, (int)opcode);
 }
 
 /*
  * Request sync osd notify
  */
-static int rbd_req_sync_notify(struct rbd_device *dev,
+static int rbd_req_sync_notify(struct rbd_device *rbd_dev,
 		          const char *obj)
 {
 	struct ceph_osd_req_op *ops;
-	struct ceph_osd_client *osdc = &dev->rbd_client->client->osdc;
+	struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
 	struct ceph_osd_event *event;
 	struct rbd_notify_info info;
 	int payload_len = sizeof(u32) + sizeof(u32);
@@ -1341,7 +1343,7 @@ static int rbd_req_sync_notify(struct rbd_device *dev,
 	if (ret < 0)
 		return ret;
 
-	info.dev = dev;
+	info.rbd_dev = rbd_dev;
 
 	ret = ceph_osdc_create_event(osdc, rbd_notify_cb, 1,
 				     (void *)&info, &event);
@@ -1354,7 +1356,7 @@ static int rbd_req_sync_notify(struct rbd_device *dev,
 	ops[0].watch.prot_ver = RADOS_NOTIFY_VER;
 	ops[0].watch.timeout = 12;
 
-	ret = rbd_req_sync_op(dev, NULL,
+	ret = rbd_req_sync_op(rbd_dev, NULL,
 			       CEPH_NOSNAP,
 			       0,
 			       CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK,
@@ -1378,7 +1380,7 @@ fail:
 /*
  * Request sync osd read
  */
-static int rbd_req_sync_exec(struct rbd_device *dev,
+static int rbd_req_sync_exec(struct rbd_device *rbd_dev,
 			     const char *obj,
 			     const char *cls,
 			     const char *method,
@@ -1402,7 +1404,7 @@ static int rbd_req_sync_exec(struct rbd_device *dev,
 	ops[0].cls.indata = data;
 	ops[0].cls.indata_len = len;
 
-	ret = rbd_req_sync_op(dev, NULL,
+	ret = rbd_req_sync_op(rbd_dev, NULL,
 			       CEPH_NOSNAP,
 			       0,
 			       CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK,
@@ -1633,7 +1635,7 @@ out_dh:
 /*
  * create a snapshot
  */
-static int rbd_header_add_snap(struct rbd_device *dev,
+static int rbd_header_add_snap(struct rbd_device *rbd_dev,
 			       const char *snap_name,
 			       gfp_t gfp_flags)
 {
@@ -1645,11 +1647,11 @@ static int rbd_header_add_snap(struct rbd_device *dev,
 	struct ceph_mon_client *monc;
 
 	/* we should create a snapshot only if we're pointing at the head */
-	if (dev->snap_id != CEPH_NOSNAP)
+	if (rbd_dev->snap_id != CEPH_NOSNAP)
 		return -EINVAL;
 
-	monc = &dev->rbd_client->client->monc;
-	ret = ceph_monc_create_snapid(monc, dev->pool_id, &new_snapid);
+	monc = &rbd_dev->rbd_client->client->monc;
+	ret = ceph_monc_create_snapid(monc, rbd_dev->pool_id, &new_snapid);
 	dout("created snapid=%lld\n", new_snapid);
 	if (ret < 0)
 		return ret;
@@ -1664,7 +1666,8 @@ static int rbd_header_add_snap(struct rbd_device *dev,
 	ceph_encode_string_safe(&p, e, snap_name, name_len, bad);
 	ceph_encode_64_safe(&p, e, new_snapid, bad);
 
-	ret = rbd_req_sync_exec(dev, dev->obj_md_name, "rbd", "snap_add",
+	ret = rbd_req_sync_exec(rbd_dev, rbd_dev->obj_md_name,
+				"rbd", "snap_add",
 				data, p - data, &ver);
 
 	kfree(data);
@@ -1672,9 +1675,9 @@ static int rbd_header_add_snap(struct rbd_device *dev,
 	if (ret < 0)
 		return ret;
 
-	down_write(&dev->header_rwsem);
-	dev->header.snapc->seq = new_snapid;
-	up_write(&dev->header_rwsem);
+	down_write(&rbd_dev->header_rwsem);
+	rbd_dev->header.snapc->seq = new_snapid;
+	up_write(&rbd_dev->header_rwsem);
 
 	return 0;
 bad: