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Commit 803ea134 authored by Andreas Gruenbacher's avatar Andreas Gruenbacher Committed by Philipp Reisner
Browse files

drbd: Add struct drbd_resource->devices 



This allows to access the volumes of a resource by number.

Signed-off-by: default avatarAndreas Gruenbacher <agruen@linbit.com>
Signed-off-by: default avatarPhilipp Reisner <philipp.reisner@linbit.com>
parent 93e4bf7a

drivers/block/drbd/drbd_int.h

+2 −0
Original line number Diff line number Diff line
@@ -539,6 +539,7 @@ enum { 
struct drbd_resource {

	char *name;

	struct kref kref;

	struct idr devices;		/* volume number to device mapping */

	struct list_head connections;

	struct list_head resources;

};
@@ -1202,6 +1203,7 @@ extern rwlock_t global_state_lock; 
extern int conn_lowest_minor(struct drbd_connection *connection);

enum drbd_ret_code drbd_create_minor(struct drbd_connection *connection, unsigned int minor, int vnr);

extern void drbd_destroy_device(struct kref *kref);

extern void drbd_delete_minor(struct drbd_device *mdev);



extern struct drbd_resource *drbd_create_resource(const char *name);

extern void drbd_free_resource(struct drbd_resource *resource);

drivers/block/drbd/drbd_main.c

+48 −14
Original line number Diff line number Diff line
@@ -2162,7 +2162,8 @@ static void drbd_release_all_peer_reqs(struct drbd_device *device) 
void drbd_destroy_device(struct kref *kref)

{

	struct drbd_device *device = container_of(kref, struct drbd_device, kref);

	struct drbd_connection *connection = first_peer_device(device)->connection;

	struct drbd_resource *resource = device->resource;

	struct drbd_connection *connection;



	del_timer_sync(&device->request_timer);
@@ -2196,7 +2197,9 @@ void drbd_destroy_device(struct kref *kref) 
	kfree(first_peer_device(device));

	kfree(device);



	for_each_connection(connection, resource)

		kref_put(&connection->kref, drbd_destroy_connection);

	kref_put(&resource->kref, drbd_destroy_resource);

}



/* One global retry thread, if we need to push back some bio and have it
@@ -2282,6 +2285,7 @@ void drbd_destroy_resource(struct kref *kref) 
	struct drbd_resource *resource =

		container_of(kref, struct drbd_resource, kref);



	idr_destroy(&resource->devices);

	kfree(resource->name);

	kfree(resource);

}
@@ -2321,14 +2325,8 @@ static void drbd_cleanup(void) 


	drbd_genl_unregister();



	idr_for_each_entry(&drbd_devices, device, i) {

		idr_remove(&drbd_devices, device_to_minor(device));

		idr_remove(&first_peer_device(device)->connection->volumes, device->vnr);

		destroy_workqueue(device->submit.wq);

		del_gendisk(device->vdisk);

		/* synchronize_rcu(); No other threads running at this point */

		kref_put(&device->kref, drbd_destroy_device);

	}

	idr_for_each_entry(&drbd_devices, device, i)

		drbd_delete_minor(device);



	/* not _rcu since, no other updater anymore. Genl already unregistered */

	for_each_resource_safe(resource, tmp, &drbd_resources) {
@@ -2543,6 +2541,7 @@ struct drbd_resource *drbd_create_resource(const char *name) 
		return NULL;

	}

	kref_init(&resource->kref);

	idr_init(&resource->devices);

	INIT_LIST_HEAD(&resource->connections);

	list_add_tail_rcu(&resource->resources, &drbd_resources);

	return resource;
@@ -2658,6 +2657,7 @@ static int init_submitter(struct drbd_device *device) 


enum drbd_ret_code drbd_create_minor(struct drbd_connection *connection, unsigned int minor, int vnr)

{

	struct drbd_resource *resource = connection->resource;

	struct drbd_device *device;

	struct drbd_peer_device *peer_device;

	struct gendisk *disk;
@@ -2673,14 +2673,17 @@ enum drbd_ret_code drbd_create_minor(struct drbd_connection *connection, unsigne 
	device = kzalloc(sizeof(struct drbd_device), GFP_KERNEL);

	if (!device)

		return ERR_NOMEM;

	kref_init(&device->kref);



	peer_device = kzalloc(sizeof(struct drbd_peer_device), GFP_KERNEL);

	if (!peer_device)

		goto out_no_peer_device;



	INIT_LIST_HEAD(&device->peer_devices);

	list_add(&peer_device->peer_devices, &device->peer_devices);

	kref_get(&resource->kref);

	device->resource = resource;

	kref_get(&connection->kref);

	device->resource = connection->resource;

	peer_device->connection = connection;

	peer_device->device = device;
@@ -2723,7 +2726,7 @@ enum drbd_ret_code drbd_create_minor(struct drbd_connection *connection, unsigne 
	blk_queue_max_hw_sectors(q, DRBD_MAX_BIO_SIZE_SAFE >> 8);

	blk_queue_bounce_limit(q, BLK_BOUNCE_ANY);

	blk_queue_merge_bvec(q, drbd_merge_bvec);

	q->queue_lock = &first_peer_device(device)->connection->req_lock; /* needed since we use */

	q->queue_lock = &connection->req_lock;



	device->md_io_page = alloc_page(GFP_KERNEL);

	if (!device->md_io_page)
@@ -2742,6 +2745,17 @@ enum drbd_ret_code drbd_create_minor(struct drbd_connection *connection, unsigne 
		}

		goto out_no_minor_idr;

	}

	kref_get(&device->kref);



	id = idr_alloc(&resource->devices, device, vnr, vnr + 1, GFP_KERNEL);

	if (id < 0) {

		if (id == -ENOSPC) {

			err = ERR_MINOR_EXISTS;

			drbd_msg_put_info("requested minor exists already");

		}

		goto out_idr_remove_minor;

	}

	kref_get(&device->kref);



	id = idr_alloc(&connection->volumes, device, vnr, vnr + 1, GFP_KERNEL);

	if (id < 0) {
@@ -2749,8 +2763,9 @@ enum drbd_ret_code drbd_create_minor(struct drbd_connection *connection, unsigne 
			err = ERR_INVALID_REQUEST;

			drbd_msg_put_info("requested volume exists already");

		}

		goto out_idr_remove_minor;

		goto out_idr_remove_from_resource;

	}

	kref_get(&device->kref);



	if (init_submitter(device)) {

		err = ERR_NOMEM;
@@ -2759,7 +2774,6 @@ enum drbd_ret_code drbd_create_minor(struct drbd_connection *connection, unsigne 
	}



	add_disk(disk);

	kref_init(&device->kref); /* one ref for both idrs and the the add_disk */



	/* inherit the connection state */

	device->state.conn = connection->cstate;
@@ -2770,6 +2784,8 @@ enum drbd_ret_code drbd_create_minor(struct drbd_connection *connection, unsigne 


out_idr_remove_vol:

	idr_remove(&connection->volumes, vnr);

out_idr_remove_from_resource:

	idr_remove(&resource->devices, vnr);

out_idr_remove_minor:

	idr_remove(&drbd_devices, minor);

	synchronize_rcu();
@@ -2783,11 +2799,29 @@ enum drbd_ret_code drbd_create_minor(struct drbd_connection *connection, unsigne 
	blk_cleanup_queue(q);

out_no_q:

	kref_put(&connection->kref, drbd_destroy_connection);

	kref_put(&resource->kref, drbd_destroy_resource);

out_no_peer_device:

	kfree(device);

	return err;

}



void drbd_delete_minor(struct drbd_device *device)

{

	struct drbd_resource *resource = device->resource;

	struct drbd_connection *connection;

	int refs = 3;



	for_each_connection(connection, resource) {

		idr_remove(&connection->volumes, device->vnr);

		refs++;

	}

	idr_remove(&resource->devices, device->vnr);

	idr_remove(&drbd_devices, device_to_minor(device));

	del_gendisk(device->vdisk);

	synchronize_rcu();

	kref_sub(&device->kref, refs, drbd_destroy_device);

}



int __init drbd_init(void)

{

	int err;

drivers/block/drbd/drbd_nl.c

+1 −6
Original line number Diff line number Diff line
@@ -3324,12 +3324,7 @@ static enum drbd_ret_code adm_del_minor(struct drbd_device *device) 
	    device->state.role == R_SECONDARY) {

		_drbd_request_state(device, NS(conn, C_WF_REPORT_PARAMS),

				    CS_VERBOSE + CS_WAIT_COMPLETE);

		idr_remove(&first_peer_device(device)->connection->volumes, device->vnr);

		idr_remove(&drbd_devices, device_to_minor(device));

		destroy_workqueue(device->submit.wq);

		del_gendisk(device->vdisk);

		synchronize_rcu();

		kref_put(&device->kref, drbd_destroy_device);

		drbd_delete_minor(device);

		return NO_ERROR;

	} else

		return ERR_MINOR_CONFIGURED;