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FS-Cache: Add netfs registration

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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>
This commit is contained in:
David Howells
2009-04-03 16:42:38 +01:00
parent 955d00917f
commit 726dd7ff10
3 changed files with 113 additions and 2 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 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);
}
/**