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authorDavid Howells <dhowells@redhat.com>2009-04-03 16:42:37 +0100
committerDavid Howells <dhowells@redhat.com>2009-04-03 16:42:37 +0100
commit0e04d4cefcf4d8fbbdb2c50e93ad541582933fd2 (patch)
tree97c4cda6a2c246660e6a5c718a9272375cdb259c /include
parenta6891645cf2ddd4778096848a864580e7258faba (diff)
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')
-rw-r--r--include/linux/fscache.h9
1 files changed, 8 insertions, 1 deletions
diff --git a/include/linux/fscache.h b/include/linux/fscache.h
index feb3b0e0af4..9584c094d69 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);
}
/**