diff options
| -rw-r--r-- | net/sunrpc/auth.c | 44 |
1 files changed, 35 insertions, 9 deletions
diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c index 2bc7bb82b162..360decdddc78 100644 --- a/net/sunrpc/auth.c +++ b/net/sunrpc/auth.c @@ -80,6 +80,10 @@ static struct kernel_param_ops param_ops_hashtbl_sz = { module_param_named(auth_hashtable_size, auth_hashbits, hashtbl_sz, 0644); MODULE_PARM_DESC(auth_hashtable_size, "RPC credential cache hashtable size"); +static unsigned long auth_max_cred_cachesize = ULONG_MAX; +module_param(auth_max_cred_cachesize, ulong, 0644); +MODULE_PARM_DESC(auth_max_cred_cachesize, "RPC credential maximum total cache size"); + static u32 pseudoflavor_to_flavor(u32 flavor) { if (flavor > RPC_AUTH_MAXFLAVOR) @@ -481,6 +485,20 @@ rpcauth_prune_expired(struct list_head *free, int nr_to_scan) return freed; } +static unsigned long +rpcauth_cache_do_shrink(int nr_to_scan) +{ + LIST_HEAD(free); + unsigned long freed; + + spin_lock(&rpc_credcache_lock); + freed = rpcauth_prune_expired(&free, nr_to_scan); + spin_unlock(&rpc_credcache_lock); + rpcauth_destroy_credlist(&free); + + return freed; +} + /* * Run memory cache shrinker. */ @@ -488,9 +506,6 @@ static unsigned long rpcauth_cache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) { - LIST_HEAD(free); - unsigned long freed; - if ((sc->gfp_mask & GFP_KERNEL) != GFP_KERNEL) return SHRINK_STOP; @@ -498,12 +513,7 @@ rpcauth_cache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) if (list_empty(&cred_unused)) return SHRINK_STOP; - spin_lock(&rpc_credcache_lock); - freed = rpcauth_prune_expired(&free, sc->nr_to_scan); - spin_unlock(&rpc_credcache_lock); - rpcauth_destroy_credlist(&free); - - return freed; + return rpcauth_cache_do_shrink(sc->nr_to_scan); } static unsigned long @@ -513,6 +523,21 @@ rpcauth_cache_shrink_count(struct shrinker *shrink, struct shrink_control *sc) return (number_cred_unused / 100) * sysctl_vfs_cache_pressure; } +static void +rpcauth_cache_enforce_limit(void) +{ + unsigned long diff; + unsigned int nr_to_scan; + + if (number_cred_unused <= auth_max_cred_cachesize) + return; + diff = number_cred_unused - auth_max_cred_cachesize; + nr_to_scan = 100; + if (diff < nr_to_scan) + nr_to_scan = diff; + rpcauth_cache_do_shrink(nr_to_scan); +} + /* * Look up a process' credentials in the authentication cache */ @@ -566,6 +591,7 @@ rpcauth_lookup_credcache(struct rpc_auth *auth, struct auth_cred * acred, } else list_add_tail(&new->cr_lru, &free); spin_unlock(&cache->lock); + rpcauth_cache_enforce_limit(); found: if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && cred->cr_ops->cr_init != NULL && |