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SUNRPC: Allow the cache_detail to specify alternative upcall mechanisms

Browse source 
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 <[email protected]>
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
Download patch file Download diff file Expand all files Collapse all files

7
net/sunrpc/auth_gss/svcauth_gss.c
View file

@ -181,6 +181,11 @@ static void rsi_request(struct cache_detail *cd,
(*bpp)[-1] = '\n';
}
static int rsi_upcall(struct cache_detail *cd, struct cache_head *h)
{
return sunrpc_cache_pipe_upcall(cd, h, rsi_request);
}
static int rsi_parse(struct cache_detail *cd,
char *mesg, int mlen)
@ -270,7 +275,7 @@ static struct cache_detail rsi_cache = {
.hash_table = rsi_table,
.name = "auth.rpcsec.init",
.cache_put = rsi_put,
.cache_request = rsi_request,
.cache_upcall = rsi_upcall,
.cache_parse = rsi_parse,
.match = rsi_match,
.init = rsi_init,

26
net/sunrpc/cache.c
View file

@ -176,7 +176,13 @@ struct cache_head *sunrpc_cache_update(struct cache_detail *detail,
}
EXPORT_SYMBOL_GPL(sunrpc_cache_update);
static int cache_make_upcall(struct cache_detail *detail, struct cache_head *h);
static int cache_make_upcall(struct cache_detail *cd, struct cache_head *h)
{
if (!cd->cache_upcall)
return -EINVAL;
return cd->cache_upcall(cd, h);
}
/*
* This is the generic cache management routine for all
* the authentication caches.
@ -322,7 +328,7 @@ static int create_cache_proc_entries(struct cache_detail *cd)
if (p == NULL)
goto out_nomem;
if (cd->cache_request || cd->cache_parse) {
if (cd->cache_upcall || cd->cache_parse) {
p = proc_create_data("channel", S_IFREG|S_IRUSR|S_IWUSR,
cd->proc_ent, &cache_file_operations, cd);
cd->channel_ent = p;
@ -1080,10 +1086,16 @@ static void warn_no_listener(struct cache_detail *detail)
}
/*
* register an upcall request to user-space.
* register an upcall request to user-space and queue it up for read() by the
* upcall daemon.
*
* Each request is at most one page long.
*/
static int cache_make_upcall(struct cache_detail *detail, struct cache_head *h)
int sunrpc_cache_pipe_upcall(struct cache_detail *detail, struct cache_head *h,
void (*cache_request)(struct cache_detail *,
struct cache_head *,
char **,
int *))
{
char *buf;
@ -1091,9 +1103,6 @@ static int cache_make_upcall(struct cache_detail *detail, struct cache_head *h)
char *bp;
int len;
if (detail->cache_request == NULL)
return -EINVAL;
if (atomic_read(&detail->readers) == 0 &&
detail->last_close < get_seconds() - 30) {
warn_no_listener(detail);
@ -1112,7 +1121,7 @@ static int cache_make_upcall(struct cache_detail *detail, struct cache_head *h)
bp = buf; len = PAGE_SIZE;
detail->cache_request(detail, h, &bp, &len);
cache_request(detail, h, &bp, &len);
if (len < 0) {
kfree(buf);
@ -1130,6 +1139,7 @@ static int cache_make_upcall(struct cache_detail *detail, struct cache_head *h)
wake_up(&queue_wait);
return 0;
}
EXPORT_SYMBOL_GPL(sunrpc_cache_pipe_upcall);
/*
* parse a message from user-space and pass it

14
net/sunrpc/svcauth_unix.c
View file

@ -171,6 +171,11 @@ static void ip_map_request(struct cache_detail *cd,
(*bpp)[-1] = '\n';
}
static int ip_map_upcall(struct cache_detail *cd, struct cache_head *h)
{
return sunrpc_cache_pipe_upcall(cd, h, ip_map_request);
}
static struct ip_map *ip_map_lookup(char *class, struct in6_addr *addr);
static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
@ -289,7 +294,7 @@ struct cache_detail ip_map_cache = {
.hash_table = ip_table,
.name = "auth.unix.ip",
.cache_put = ip_map_put,
.cache_request = ip_map_request,
.cache_upcall = ip_map_upcall,
.cache_parse = ip_map_parse,
.cache_show = ip_map_show,
.match = ip_map_match,
@ -523,6 +528,11 @@ static void unix_gid_request(struct cache_detail *cd,
(*bpp)[-1] = '\n';
}
static int unix_gid_upcall(struct cache_detail *cd, struct cache_head *h)
{
return sunrpc_cache_pipe_upcall(cd, h, unix_gid_request);
}
static struct unix_gid *unix_gid_lookup(uid_t uid);
extern struct cache_detail unix_gid_cache;
@ -622,7 +632,7 @@ struct cache_detail unix_gid_cache = {
.hash_table = gid_table,
.name = "auth.unix.gid",
.cache_put = unix_gid_put,
.cache_request = unix_gid_request,
.cache_upcall = unix_gid_upcall,
.cache_parse = unix_gid_parse,
.cache_show = unix_gid_show,
.match = unix_gid_match,