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Commit e2839308 authored by Alex Elder's avatar Alex Elder
Browse files

rbd: rename rbd_id_get() 



This should have been done as part of this commit:

    commit de71a297
    Author: Alex Elder <elder@inktank.com>
    Date:   Tue Jul 3 16:01:19 2012 -0500
    rbd: rename rbd_device->id

rbd_id_get() is assigning the rbd_dev->dev_id field.  Change the
name of that function as well as rbd_id_put() and rbd_id_max
to reflect what they are affecting.

Add some dynamic debug statements related to rbd device id activity.

Signed-off-by: default avatarAlex Elder <elder@inktank.com>
Reviewed-by: default avatarJosh Durgin <josh.durgin@inktank.com>
parent aafb230e

drivers/block/rbd.c

+15 −10
Original line number Diff line number Diff line
@@ -2304,26 +2304,28 @@ static int rbd_init_watch_dev(struct rbd_device *rbd_dev) 
	return ret;

}



static atomic64_t rbd_id_max = ATOMIC64_INIT(0);

static atomic64_t rbd_dev_id_max = ATOMIC64_INIT(0);



/*

 * Get a unique rbd identifier for the given new rbd_dev, and add

 * the rbd_dev to the global list.  The minimum rbd id is 1.

 */

static void rbd_id_get(struct rbd_device *rbd_dev)

static void rbd_dev_id_get(struct rbd_device *rbd_dev)

{

	rbd_dev->dev_id = atomic64_inc_return(&rbd_id_max);

	rbd_dev->dev_id = atomic64_inc_return(&rbd_dev_id_max);



	spin_lock(&rbd_dev_list_lock);

	list_add_tail(&rbd_dev->node, &rbd_dev_list);

	spin_unlock(&rbd_dev_list_lock);

	dout("rbd_dev %p given dev id %llu\n", rbd_dev,

		(unsigned long long) rbd_dev->dev_id);

}



/*

 * Remove an rbd_dev from the global list, and record that its

 * identifier is no longer in use.

 */

static void rbd_id_put(struct rbd_device *rbd_dev)

static void rbd_dev_id_put(struct rbd_device *rbd_dev)

{

	struct list_head *tmp;

	int rbd_id = rbd_dev->dev_id;
@@ -2331,6 +2333,8 @@ static void rbd_id_put(struct rbd_device *rbd_dev) 


	rbd_assert(rbd_id > 0);



	dout("rbd_dev %p released dev id %llu\n", rbd_dev,

		(unsigned long long) rbd_dev->dev_id);

	spin_lock(&rbd_dev_list_lock);

	list_del_init(&rbd_dev->node);
@@ -2338,7 +2342,7 @@ static void rbd_id_put(struct rbd_device *rbd_dev) 
	 * If the id being "put" is not the current maximum, there

	 * is nothing special we need to do.

	 */

	if (rbd_id != atomic64_read(&rbd_id_max)) {

	if (rbd_id != atomic64_read(&rbd_dev_id_max)) {

		spin_unlock(&rbd_dev_list_lock);

		return;

	}
@@ -2359,12 +2363,13 @@ static void rbd_id_put(struct rbd_device *rbd_dev) 
	spin_unlock(&rbd_dev_list_lock);



	/*

	 * The max id could have been updated by rbd_id_get(), in

	 * The max id could have been updated by rbd_dev_id_get(), in

	 * which case it now accurately reflects the new maximum.

	 * Be careful not to overwrite the maximum value in that

	 * case.

	 */

	atomic64_cmpxchg(&rbd_id_max, rbd_id, max_id);

	atomic64_cmpxchg(&rbd_dev_id_max, rbd_id, max_id);

	dout("  max dev id has been reset\n");

}



/*
@@ -2563,7 +2568,7 @@ static ssize_t rbd_add(struct bus_type *bus, 
	init_rwsem(&rbd_dev->header_rwsem);



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

	rbd_id_get(rbd_dev);

	rbd_dev_id_get(rbd_dev);



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

	BUILD_BUG_ON(DEV_NAME_LEN
@@ -2631,7 +2636,7 @@ static ssize_t rbd_add(struct bus_type *bus, 
		kfree(rbd_dev->image_name);

		kfree(rbd_dev->pool_name);

	}

	rbd_id_put(rbd_dev);

	rbd_dev_id_put(rbd_dev);

err_nomem:

	kfree(rbd_dev);

	kfree(options);
@@ -2683,7 +2688,7 @@ static void rbd_dev_release(struct device *dev) 
	kfree(rbd_dev->header_name);

	kfree(rbd_dev->pool_name);

	kfree(rbd_dev->image_name);

	rbd_id_put(rbd_dev);

	rbd_dev_id_put(rbd_dev);

	kfree(rbd_dev);



	/* release module ref */