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-rw-r--r--include/linux/fscache.h16
1 files changed, 15 insertions, 1 deletions
diff --git a/include/linux/fscache.h b/include/linux/fscache.h
index b195c2e1ef6a..245b48646efa 100644
--- a/include/linux/fscache.h
+++ b/include/linux/fscache.h
@@ -178,6 +178,13 @@ extern void __fscache_unregister_netfs(struct fscache_netfs *);
178extern struct fscache_cache_tag *__fscache_lookup_cache_tag(const char *); 178extern struct fscache_cache_tag *__fscache_lookup_cache_tag(const char *);
179extern void __fscache_release_cache_tag(struct fscache_cache_tag *); 179extern void __fscache_release_cache_tag(struct fscache_cache_tag *);
180 180
181extern struct fscache_cookie *__fscache_acquire_cookie(
182 struct fscache_cookie *,
183 const struct fscache_cookie_def *,
184 void *);
185extern void __fscache_relinquish_cookie(struct fscache_cookie *, int);
186extern void __fscache_update_cookie(struct fscache_cookie *);
187
181/** 188/**
182 * fscache_register_netfs - Register a filesystem as desiring caching services 189 * fscache_register_netfs - Register a filesystem as desiring caching services
183 * @netfs: The description of the filesystem 190 * @netfs: The description of the filesystem
@@ -269,7 +276,10 @@ struct fscache_cookie *fscache_acquire_cookie(
269 const struct fscache_cookie_def *def, 276 const struct fscache_cookie_def *def,
270 void *netfs_data) 277 void *netfs_data)
271{ 278{
272 return NULL; 279 if (fscache_cookie_valid(parent))
280 return __fscache_acquire_cookie(parent, def, netfs_data);
281 else
282 return NULL;
273} 283}
274 284
275/** 285/**
@@ -287,6 +297,8 @@ struct fscache_cookie *fscache_acquire_cookie(
287static inline 297static inline
288void fscache_relinquish_cookie(struct fscache_cookie *cookie, int retire) 298void fscache_relinquish_cookie(struct fscache_cookie *cookie, int retire)
289{ 299{
300 if (fscache_cookie_valid(cookie))
301 __fscache_relinquish_cookie(cookie, retire);
290} 302}
291 303
292/** 304/**
@@ -302,6 +314,8 @@ void fscache_relinquish_cookie(struct fscache_cookie *cookie, int retire)
302static inline 314static inline
303void fscache_update_cookie(struct fscache_cookie *cookie) 315void fscache_update_cookie(struct fscache_cookie *cookie)
304{ 316{
317 if (fscache_cookie_valid(cookie))
318 __fscache_update_cookie(cookie);
305} 319}
306 320
307/** 321/**