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| author | David Howells <dhowells@redhat.com> | 2009-04-03 19:42:37 +0400 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2009-04-03 19:42:37 +0400 |
| commit | 0e04d4cefcf4d8fbbdb2c50e93ad541582933fd2 (patch) | |
| tree | 97c4cda6a2c246660e6a5c718a9272375cdb259c /include/linux/fscache.h | |
| parent | a6891645cf2ddd4778096848a864580e7258faba (diff) | |
| download | linux-0e04d4cefcf4d8fbbdb2c50e93ad541582933fd2.tar.xz | |
FS-Cache: Add cache tag handling
Implement two features of FS-Cache:
(1) The ability to request and release cache tags - names by which a cache may
be known to a netfs, and thus selected for use.
(2) An internal function by which a cache is selected by consulting the netfs,
if the netfs wishes to be consulted.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Steve Dickson <steved@redhat.com>
Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
Diffstat (limited to 'include/linux/fscache.h')
| -rw-r--r-- | include/linux/fscache.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/include/linux/fscache.h b/include/linux/fscache.h index feb3b0e0af4d..9584c094d69f 100644 --- a/include/linux/fscache.h +++ b/include/linux/fscache.h @@ -173,6 +173,8 @@ struct fscache_netfs { * - these are undefined symbols when FS-Cache is not configured and the * optimiser takes care of not using them */ +extern struct fscache_cache_tag *__fscache_lookup_cache_tag(const char *); +extern void __fscache_release_cache_tag(struct fscache_cache_tag *); /** * fscache_register_netfs - Register a filesystem as desiring caching services @@ -218,7 +220,10 @@ void fscache_unregister_netfs(struct fscache_netfs *netfs) static inline struct fscache_cache_tag *fscache_lookup_cache_tag(const char *name) { - return NULL; + if (fscache_available()) + return __fscache_lookup_cache_tag(name); + else + return NULL; } /** @@ -233,6 +238,8 @@ struct fscache_cache_tag *fscache_lookup_cache_tag(const char *name) static inline void fscache_release_cache_tag(struct fscache_cache_tag *tag) { + if (fscache_available()) + __fscache_release_cache_tag(tag); } /** |