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- #define FSCACHE_DEBUG_LEVEL COOKIE
- #include <linux/module.h>
- #include <linux/slab.h>
- #include "internal.h"
- static LIST_HEAD(fscache_netfs_list);
- int __fscache_register_netfs(struct fscache_netfs *netfs)
- {
- struct fscache_netfs *ptr;
- struct fscache_cookie *cookie;
- int ret;
- _enter("{%s}", netfs->name);
- INIT_LIST_HEAD(&netfs->link);
-
- cookie = kmem_cache_zalloc(fscache_cookie_jar, GFP_KERNEL);
- if (!cookie) {
- _leave(" = -ENOMEM");
- return -ENOMEM;
- }
-
- atomic_set(&cookie->usage, 1);
- atomic_set(&cookie->n_children, 0);
- atomic_set(&cookie->n_active, 1);
- cookie->def = &fscache_fsdef_netfs_def;
- cookie->parent = &fscache_fsdef_index;
- cookie->netfs_data = netfs;
- cookie->flags = 1 << FSCACHE_COOKIE_ENABLED;
- spin_lock_init(&cookie->lock);
- spin_lock_init(&cookie->stores_lock);
- INIT_HLIST_HEAD(&cookie->backing_objects);
-
- down_write(&fscache_addremove_sem);
- ret = -EEXIST;
- list_for_each_entry(ptr, &fscache_netfs_list, link) {
- if (strcmp(ptr->name, netfs->name) == 0)
- goto already_registered;
- }
- atomic_inc(&cookie->parent->usage);
- atomic_inc(&cookie->parent->n_children);
- netfs->primary_index = cookie;
- list_add(&netfs->link, &fscache_netfs_list);
- ret = 0;
- pr_notice("Netfs '%s' registered for caching\n", netfs->name);
- already_registered:
- up_write(&fscache_addremove_sem);
- if (ret < 0)
- kmem_cache_free(fscache_cookie_jar, cookie);
- _leave(" = %d", ret);
- return ret;
- }
- EXPORT_SYMBOL(__fscache_register_netfs);
- void __fscache_unregister_netfs(struct fscache_netfs *netfs)
- {
- _enter("{%s.%u}", netfs->name, netfs->version);
- down_write(&fscache_addremove_sem);
- list_del(&netfs->link);
- fscache_relinquish_cookie(netfs->primary_index, 0);
- up_write(&fscache_addremove_sem);
- pr_notice("Netfs '%s' unregistered from caching\n",
- netfs->name);
- _leave("");
- }
- EXPORT_SYMBOL(__fscache_unregister_netfs);
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