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| author | David Howells <dhowells@redhat.com> | 2009-04-03 19:42:38 +0400 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2009-04-03 19:42:38 +0400 |
| commit | 726dd7ff10c217dd74329c94643dc8ebea27334b (patch) | |
| tree | 9bd5b011f945fca4f1b057f7e7750414b1fd9fbd /include | |
| parent | 955d00917f0c094e0f2fb88df967e980ab66b8ca (diff) | |
| download | linux-726dd7ff10c217dd74329c94643dc8ebea27334b.tar.xz | |
FS-Cache: Add netfs registration
Add functions to register and unregister a network filesystem or other client
of the FS-Cache service. This allocates and releases the cookie representing
the top-level index for a netfs, and makes it available to the netfs.
If the FS-Cache facility is disabled, then the calls are optimised away at
compile time.
Note that whilst this patch may appear to work with FS-Cache enabled and a
netfs attempting to use it, it will leak the cookie it allocates for the netfs
as fscache_relinquish_cookie() is implemented in a later patch. This will
cause the slab code to emit a warning when the module is removed.
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.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/include/linux/fscache.h b/include/linux/fscache.h index 9584c094d69f..b195c2e1ef6a 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 int __fscache_register_netfs(struct fscache_netfs *); +extern void __fscache_unregister_netfs(struct fscache_netfs *); extern struct fscache_cache_tag *__fscache_lookup_cache_tag(const char *); extern void __fscache_release_cache_tag(struct fscache_cache_tag *); @@ -188,7 +190,10 @@ extern void __fscache_release_cache_tag(struct fscache_cache_tag *); static inline int fscache_register_netfs(struct fscache_netfs *netfs) { - return 0; + if (fscache_available()) + return __fscache_register_netfs(netfs); + else + return 0; } /** @@ -205,6 +210,8 @@ int fscache_register_netfs(struct fscache_netfs *netfs) static inline void fscache_unregister_netfs(struct fscache_netfs *netfs) { + if (fscache_available()) + __fscache_unregister_netfs(netfs); } /** |