linux-master/mm/zpool.c

22 	struct zpool_driver *driver;
31  * @driver:	driver to register
33 void zpool_register_driver(struct zpool_driver *driver)
36 	atomic_set(&driver->refcount, 0);
37 	list_add(&driver->list, &drivers_head);
44  * @driver:	driver to unregister.
46  * Module usage counting is used to prevent using a driver
50  * failure, the driver is in use and must remain available.
52 int zpool_unregister_driver(struct zpool_driver *driver)
57 	refcount = atomic_read(&driver->refcount);
62 		list_del(&driver->list);
72 	struct zpool_driver *driver;
75 	list_for_each_entry(driver, &drivers_head, list) {
76 		if (!strcmp(driver->type, type)) {
77 			bool got = try_module_get(driver->owner);
80 				atomic_inc(&driver->refcount);
82 			return got ? driver : NULL;
90 static void zpool_put_driver(struct zpool_driver *driver)
92 	atomic_dec(&driver->refcount);
93 	module_put(driver->owner);
97  * zpool_has_pool() - Check if the pool driver is available
100  * This checks if the @type pool driver is available.  This will try to load
116 	struct zpool_driver *driver = zpool_get_driver(type);
118 	if (!driver) {
120 		driver = zpool_get_driver(type);
123 	if (!driver)
126 	zpool_put_driver(driver);
149 	struct zpool_driver *driver;
154 	driver = zpool_get_driver(type);
156 	if (!driver) {
158 		driver = zpool_get_driver(type);
161 	if (!driver) {
162 		pr_err("no driver for type %s\n", type);
169 		zpool_put_driver(driver);
173 	zpool->driver = driver;
174 	zpool->pool = driver->create(name, gfp);
178 		zpool_put_driver(driver);
201 	pr_debug("destroying pool type %s\n", zpool->driver->type);
203 	zpool->driver->destroy(zpool->pool);
204 	zpool_put_driver(zpool->driver);
220 	return zpool->driver->type;
236 	return zpool->driver->malloc_support_movable;
258 	return zpool->driver->malloc(zpool->pool, size, gfp, handle);
277 	zpool->driver->free(zpool->pool, handle);
305 	return zpool->driver->map(zpool->pool, handle, mapmode);
320 	zpool->driver->unmap(zpool->pool, handle);
333 	return zpool->driver->total_size(zpool->pool);
351 	return zpool->driver->sleep_mapped;