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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
parent da77005f0d
commit bc74b4f5e6
6 changed files with 72 additions and 18 deletions
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16
fs/nfsd/nfs4idmap.c
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@@ -145,6 +145,12 @@ idtoname_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
(*bpp)[-1] = '\n';
}
static int
idtoname_upcall(struct cache_detail *cd, struct cache_head *ch)
{
return sunrpc_cache_pipe_upcall(cd, ch, idtoname_request);
}
static int
idtoname_match(struct cache_head *ca, struct cache_head *cb)
{
@@ -192,7 +198,7 @@ static struct cache_detail idtoname_cache = {
.hash_table = idtoname_table,
.name = "nfs4.idtoname",
.cache_put = ent_put,
.cache_request = idtoname_request,
.cache_upcall = idtoname_upcall,
.cache_parse = idtoname_parse,
.cache_show = idtoname_show,
.warn_no_listener = warn_no_idmapd,
@@ -324,6 +330,12 @@ nametoid_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
(*bpp)[-1] = '\n';
}
static int
nametoid_upcall(struct cache_detail *cd, struct cache_head *ch)
{
return sunrpc_cache_pipe_upcall(cd, ch, nametoid_request);
}
static int
nametoid_match(struct cache_head *ca, struct cache_head *cb)
{
@@ -363,7 +375,7 @@ static struct cache_detail nametoid_cache = {
.hash_table = nametoid_table,
.name = "nfs4.nametoid",
.cache_put = ent_put,
.cache_request = nametoid_request,
.cache_upcall = nametoid_upcall,
.cache_parse = nametoid_parse,
.cache_show = nametoid_show,
.warn_no_listener = warn_no_idmapd,