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Commit 124afba2 authored by Alex Elder's avatar Alex Elder Committed by Sage Weil
Browse files

rbd: encapsulate probing for parent devices 



Encapsulate the code that probes for an rbd device's parent images
into a new function, rbd_dev_probe_parent().

Signed-off-by: default avatarAlex Elder <elder@inktank.com>
Reviewed-by: default avatarJosh Durgin <josh.durgin@inktank.com>
parent b5156e76

drivers/block/rbd.c

+44 −38
Original line number Diff line number Diff line
@@ -4702,11 +4702,49 @@ static int rbd_dev_v2_probe(struct rbd_device *rbd_dev) 
	return ret;

}



static int rbd_dev_probe_finish(struct rbd_device *rbd_dev)

static int rbd_dev_probe_parent(struct rbd_device *rbd_dev)

{

	struct rbd_device *parent = NULL;

	struct rbd_spec *parent_spec = NULL;

	struct rbd_client *rbdc = NULL;

	struct rbd_spec *parent_spec;

	struct rbd_client *rbdc;

	int ret;



	if (!rbd_dev->parent_spec)

		return 0;

	/*

	 * We need to pass a reference to the client and the parent

	 * spec when creating the parent rbd_dev.  Images related by

	 * parent/child relationships always share both.

	 */

	parent_spec = rbd_spec_get(rbd_dev->parent_spec);

	rbdc = __rbd_get_client(rbd_dev->rbd_client);



	ret = -ENOMEM;

	parent = rbd_dev_create(rbdc, parent_spec);

	if (!parent)

		goto out_err;



	ret = rbd_dev_image_probe(parent);

	if (ret < 0)

		goto out_err;

	rbd_dev->parent = parent;



	return 0;

out_err:

	if (parent) {

		rbd_spec_put(rbd_dev->parent_spec);

		kfree(rbd_dev->header_name);

		rbd_dev_destroy(parent);

	} else {

		rbd_put_client(rbdc);

		rbd_spec_put(parent_spec);

	}



	return ret;

}



static int rbd_dev_probe_finish(struct rbd_device *rbd_dev)

{

	int ret;



	/* no need to lock here, as rbd_dev is not registered yet */
@@ -4747,34 +4785,9 @@ static int rbd_dev_probe_finish(struct rbd_device *rbd_dev) 
	if (ret)

		goto err_out_disk;



	/*

	 * At this point cleanup in the event of an error is the job

	 * of the sysfs code (initiated by rbd_bus_del_dev()).

	 */

	/* Probe the parent if there is one */



	if (rbd_dev->parent_spec) {

		/*

		 * We need to pass a reference to the client and the

		 * parent spec when creating the parent rbd_dev.

		 * Images related by parent/child relationships

		 * always share both.

		 */

		parent_spec = rbd_spec_get(rbd_dev->parent_spec);

		rbdc = __rbd_get_client(rbd_dev->rbd_client);



		parent = rbd_dev_create(rbdc, parent_spec);

		if (!parent) {

			ret = -ENOMEM;

			goto err_out_spec;

		}

		rbdc = NULL;		/* parent now owns reference */

		parent_spec = NULL;	/* parent now owns reference */

		ret = rbd_dev_image_probe(parent);

		if (ret < 0)

			goto err_out_parent;

		rbd_dev->parent = parent;

	}

	ret = rbd_dev_probe_parent(rbd_dev);

	if (ret)

		goto err_out_bus;



	ret = rbd_dev_header_watch_sync(rbd_dev, 1);

	if (ret)
@@ -4791,13 +4804,6 @@ static int rbd_dev_probe_finish(struct rbd_device *rbd_dev) 


	return ret;



err_out_parent:

	rbd_spec_put(rbd_dev->parent_spec);

	kfree(rbd_dev->header_name);

	rbd_dev_destroy(parent);

err_out_spec:

	rbd_spec_put(parent_spec);

	rbd_put_client(rbdc);

err_out_bus:

	/* this will also clean up rest of rbd_dev stuff */