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SUNRPC: Allow the cache_detail to specify alternative upcall mechanisms

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For events that are rare, such as referral DNS lookups, it makes limited
sense to have a daemon constantly listening for upcalls on a channel. An
alternative in those cases might simply be to run the app that fills the
cache using call_usermodehelper_exec() and friends.

The following patch allows the cache_detail to specify alternative upcall
mechanisms for these particular cases.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2009-08-09 15:14:29 -04:00
commit bc74b4f5e6
6 changed files with 72 additions and 18 deletions
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13
include/linux/sunrpc/cache.h
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@ -70,9 +70,9 @@ struct cache_detail {
char *name;
void (*cache_put)(struct kref *);
void (*cache_request)(struct cache_detail *cd,
struct cache_head *h,
char **bpp, int *blen);
int (*cache_upcall)(struct cache_detail *,
struct cache_head *);
int (*cache_parse)(struct cache_detail *,
char *buf, int len);
@ -135,6 +135,13 @@ extern struct cache_head *
sunrpc_cache_update(struct cache_detail *detail,
struct cache_head *new, struct cache_head *old, int hash);
extern int
sunrpc_cache_pipe_upcall(struct cache_detail *detail, struct cache_head *h,
void (*cache_request)(struct cache_detail *,
struct cache_head *,
char **,
int *));
extern void cache_clean_deferred(void *owner);