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FS-Cache: Add cache tag handling

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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>
This commit is contained in:
David Howells
2009-04-03 16:42:37 +01:00
parent a6891645cf
commit 0e04d4cefc
4 changed files with 195 additions and 1 deletions
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9
include/linux/fscache.h
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@@ -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);
}
/**