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Commit 85ae8926 authored by Alex Elder's avatar Alex Elder
Browse files

rbd: defer setting device id 



Hold off setting the device id and formatting the device name
in rbd_add() until just before it's needed.

Signed-off-by: default avatarAlex Elder <elder@inktank.com>
Reviewed-by: default avatarJosh Durgin <josh.durgin@inktank.com>
parent 05fd6f6f

drivers/block/rbd.c

+22 −22
Original line number Diff line number Diff line
@@ -2554,10 +2554,10 @@ static ssize_t rbd_add(struct bus_type *bus, 


	options = kmalloc(count, GFP_KERNEL);

	if (!options)

		goto err_nomem;

		goto err_out_mem;

	rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL);

	if (!rbd_dev)

		goto err_nomem;

		goto err_out_mem;



	/* static rbd_device initialization */

	spin_lock_init(&rbd_dev->lock);
@@ -2565,25 +2565,17 @@ static ssize_t rbd_add(struct bus_type *bus, 
	INIT_LIST_HEAD(&rbd_dev->snaps);

	init_rwsem(&rbd_dev->header_rwsem);



	/* generate unique id: find highest unique id, add one */

	rbd_dev_id_get(rbd_dev);



	/* Fill in the device name, now that we have its id. */

	BUILD_BUG_ON(DEV_NAME_LEN

			< sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH);

	sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->dev_id);



	/* parse add command */

	snap_name = rbd_add_parse_args(rbd_dev, buf,

				&mon_addrs, &mon_addrs_size, options, count);

	if (IS_ERR(snap_name)) {

		rc = PTR_ERR(snap_name);

		goto err_put_id;

		goto err_out_mem;

	}



	rc = rbd_get_client(rbd_dev, mon_addrs, mon_addrs_size - 1, options);

	if (rc < 0)

		goto err_put_id;

		goto err_out_args;



	/* pick the pool */

	osdc = &rbd_dev->rbd_client->client->osdc;
@@ -2616,10 +2608,19 @@ static ssize_t rbd_add(struct bus_type *bus, 
	if (rc)

		goto err_out_header;



	/* register our block device */

	/* generate unique id: find highest unique id, add one */

	rbd_dev_id_get(rbd_dev);



	/* Fill in the device name, now that we have its id. */

	BUILD_BUG_ON(DEV_NAME_LEN

			< sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH);

	sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->dev_id);



	/* Get our block major device number. */



	rc = register_blkdev(0, rbd_dev->name);

	if (rc < 0)

		goto err_out_header;

		goto err_out_id;

	rbd_dev->major = rc;



	rc = rbd_bus_add_dev(rbd_dev);
@@ -2665,19 +2666,18 @@ static ssize_t rbd_add(struct bus_type *bus, 


err_out_blkdev:

	unregister_blkdev(rbd_dev->major, rbd_dev->name);

err_out_id:

	rbd_dev_id_put(rbd_dev);

err_out_header:

	rbd_header_free(&rbd_dev->header);

err_out_client:

	kfree(rbd_dev->header_name);

	rbd_put_client(rbd_dev);

err_put_id:

	if (rbd_dev->pool_name) {

err_out_args:

	kfree(rbd_dev->mapping.snap_name);

	kfree(rbd_dev->image_name);

	kfree(rbd_dev->pool_name);

	}

	rbd_dev_id_put(rbd_dev);

err_nomem:

err_out_mem:

	kfree(rbd_dev);

	kfree(options);