rbd: move rbd_opts to struct rbd_device

The rbd options don't really apply to the ceph client.  So don't
store a pointer to it in the ceph_client structure, and put them
(a struct, not a pointer) into the rbd_dev structure proper.

Pass the rbd device structure to rbd_client_create() so it can
assign rbd_dev->rbdc if successful, and have it return an error code
instead of the rbd client pointer.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Yehuda Sadeh <yehuda@inktank.com>

drivers/block/rbd.c

@@ -98,7 +98,6 @@ struct rbd_options {
  */
 struct rbd_client {
 	struct ceph_client	*client;
-	struct rbd_options	*rbd_opts;
 	struct kref		kref;
 	struct list_head	node;
 };
@@ -152,6 +151,7 @@ struct rbd_device {
 	struct gendisk		*disk;		/* blkdev's gendisk and rq */
 	struct request_queue	*q;
 
+	struct rbd_options	rbd_opts;
 	struct rbd_client	*rbd_client;
 
 	char			name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */
@@ -273,8 +273,7 @@ static const struct block_device_operations rbd_bd_ops = {
  * Initialize an rbd client instance.
  * We own *ceph_opts.
  */
-static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts,
-					    struct rbd_options *rbd_opts)
+static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts)
 {
 	struct rbd_client *rbdc;
 	int ret = -ENOMEM;
@@ -298,8 +297,6 @@ static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts,
 	if (ret < 0)
 		goto out_err;
 
-	rbdc->rbd_opts = rbd_opts;
-
 	spin_lock(&rbd_client_list_lock);
 	list_add_tail(&rbdc->node, &rbd_client_list);
 	spin_unlock(&rbd_client_list_lock);
@@ -402,42 +399,33 @@ static int parse_rbd_opts_token(char *c, void *private)
  * Get a ceph client with specific addr and configuration, if one does
  * not exist create it.
  */
-static struct rbd_client *rbd_get_client(const char *mon_addr,
-					 size_t mon_addr_len,
-					 char *options)
+static int rbd_get_client(struct rbd_device *rbd_dev, const char *mon_addr,
+				size_t mon_addr_len, char *options)
 {
-	struct rbd_client *rbdc;
+	struct rbd_options *rbd_opts = &rbd_dev->rbd_opts;
 	struct ceph_options *ceph_opts;
-	struct rbd_options *rbd_opts;
-
-	rbd_opts = kzalloc(sizeof(*rbd_opts), GFP_KERNEL);
-	if (!rbd_opts)
-		return ERR_PTR(-ENOMEM);
+	struct rbd_client *rbdc;
 
 	rbd_opts->notify_timeout = RBD_NOTIFY_TIMEOUT_DEFAULT;
 
 	ceph_opts = ceph_parse_options(options, mon_addr,
 					mon_addr + mon_addr_len,
 					parse_rbd_opts_token, rbd_opts);
-	if (IS_ERR(ceph_opts)) {
-		kfree(rbd_opts);
-		return ERR_CAST(ceph_opts);
-	}
+	if (IS_ERR(ceph_opts))
+		return PTR_ERR(ceph_opts);
 
 	rbdc = rbd_client_find(ceph_opts);
 	if (rbdc) {
 		/* using an existing client */
 		ceph_destroy_options(ceph_opts);
-		kfree(rbd_opts);
-
-		return rbdc;
-	}
-
-	rbdc = rbd_client_create(ceph_opts, rbd_opts);
+	} else {
+		rbdc = rbd_client_create(ceph_opts);
 		if (IS_ERR(rbdc))
-		kfree(rbd_opts);
+			return PTR_ERR(rbdc);
+	}
+	rbd_dev->rbd_client = rbdc;
 
-	return rbdc;
+	return 0;
 }
 
 /*
@@ -455,7 +443,6 @@ static void rbd_client_release(struct kref *kref)
 	spin_unlock(&rbd_client_list_lock);
 
 	ceph_destroy_client(rbdc->client);
-	kfree(rbdc->rbd_opts);
 	kfree(rbdc);
 }
 
@@ -2533,13 +2520,9 @@ static ssize_t rbd_add(struct bus_type *bus,
 	if (rc)
 		goto err_put_id;
 
-	rbd_dev->rbd_client = rbd_get_client(mon_addrs, mon_addrs_size - 1,
-						options);
-	if (IS_ERR(rbd_dev->rbd_client)) {
-		rc = PTR_ERR(rbd_dev->rbd_client);
-		rbd_dev->rbd_client = NULL;
+	rc = rbd_get_client(rbd_dev, mon_addrs, mon_addrs_size - 1, options);
+	if (rc < 0)
 		goto err_put_id;
-	}
 
 	/* pick the pool */
 	osdc = &rbd_dev->rbd_client->client->osdc;