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Diffstat (limited to 'fs/fscache/netfs.c')
-rw-r--r--fs/fscache/netfs.c81
1 files changed, 20 insertions, 61 deletions
diff --git a/fs/fscache/netfs.c b/fs/fscache/netfs.c
index a5998dfab7e7..c2f605483cc5 100644
--- a/fs/fscache/netfs.c
+++ b/fs/fscache/netfs.c
@@ -14,85 +14,51 @@
#include <linux/slab.h>
#include "internal.h"
-static LIST_HEAD(fscache_netfs_list);
-
/*
* register a network filesystem for caching
*/
int __fscache_register_netfs(struct fscache_netfs *netfs)
{
- struct fscache_netfs *ptr;
- struct fscache_cookie *cookie;
- int ret;
+ struct fscache_cookie *candidate, *cookie;
_enter("{%s}", netfs->name);
- INIT_LIST_HEAD(&netfs->link);
-
/* allocate a cookie for the primary index */
- cookie = kmem_cache_zalloc(fscache_cookie_jar, GFP_KERNEL);
-
- if (!cookie) {
+ candidate = fscache_alloc_cookie(&fscache_fsdef_index,
+ &fscache_fsdef_netfs_def,
+ netfs->name, strlen(netfs->name),
+ &netfs->version, sizeof(netfs->version),
+ netfs, 0);
+ if (!candidate) {
_leave(" = -ENOMEM");
return -ENOMEM;
}
- cookie->key_len = strlen(netfs->name);
- if (cookie->key_len <= sizeof(cookie->inline_key)) {
- memcpy(cookie->inline_key, netfs->name, strlen(netfs->name));
- } else {
- ret = -ENOMEM;
- cookie->key = kmemdup(netfs->name, cookie->key_len, GFP_KERNEL);
- if (!cookie->key)
- goto nomem;
- }
-
- cookie->aux_len = sizeof(netfs->version);
- memcpy(cookie->inline_aux, &netfs->version, cookie->aux_len);
-
- /* initialise the primary index cookie */
- 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;
- cookie->type = FSCACHE_COOKIE_TYPE_INDEX;
-
- spin_lock_init(&cookie->lock);
- spin_lock_init(&cookie->stores_lock);
- INIT_HLIST_HEAD(&cookie->backing_objects);
+ candidate->flags = 1 << FSCACHE_COOKIE_ENABLED;
/* check the netfs type is not already present */
- 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;
+ cookie = fscache_hash_cookie(candidate);
+ if (!cookie)
+ goto already_registered;
+ if (cookie != candidate) {
+ trace_fscache_cookie(candidate, fscache_cookie_discard, 1);
+ fscache_free_cookie(candidate);
}
fscache_cookie_get(cookie->parent, fscache_cookie_get_register_netfs);
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);
trace_fscache_netfs(netfs);
+ _leave(" = 0");
+ return 0;
already_registered:
- up_write(&fscache_addremove_sem);
-
-nomem:
- if (ret < 0)
- kmem_cache_free(fscache_cookie_jar, cookie);
-
- _leave(" = %d", ret);
- return ret;
+ fscache_cookie_put(candidate, fscache_cookie_put_dup_netfs);
+ _leave(" = -EEXIST");
+ return -EEXIST;
}
EXPORT_SYMBOL(__fscache_register_netfs);
@@ -104,15 +70,8 @@ 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, NULL, false);
-
- up_write(&fscache_addremove_sem);
-
- pr_notice("Netfs '%s' unregistered from caching\n",
- netfs->name);
+ pr_notice("Netfs '%s' unregistered from caching\n", netfs->name);
_leave("");
}