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SUNRPC: Add lockless lookup of the server's auth domain 

Avoid taking the global auth_domain_lock in most lookups of the auth domain
by adding an RCU protected lookup.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Trond Myklebust 2018-10-01 10:41:44 -04:00 committed by J. Bruce Fields
parent 30382d6ce5
commit 608a0ab2f5
4 changed files with 36 additions and 6 deletions
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1
include/linux/sunrpc/svcauth.h
View File

@ -82,6 +82,7 @@ struct auth_domain {
struct hlist_node hash;
char *name;
struct auth_ops *flavour;
struct rcu_head rcu_head;
};
/*

9
net/sunrpc/auth_gss/svcauth_gss.c
View File

@ -1764,14 +1764,21 @@ out_err:
}
static void
svcauth_gss_domain_release(struct auth_domain *dom)
svcauth_gss_domain_release_rcu(struct rcu_head *head)
{
struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head);
struct gss_domain *gd = container_of(dom, struct gss_domain, h);
kfree(dom->name);
kfree(gd);
}
static void
svcauth_gss_domain_release(struct auth_domain *dom)
{
call_rcu(&dom->rcu_head, svcauth_gss_domain_release_rcu);
}
static struct auth_ops svcauthops_gss = {
.name = "rpcsec_gss",
.owner = THIS_MODULE,

22
net/sunrpc/svcauth.c
View File

@ -143,10 +143,11 @@ static struct hlist_head auth_domain_table[DN_HASHMAX];
static DEFINE_SPINLOCK(auth_domain_lock);
static void auth_domain_release(struct kref *kref)
__releases(&auth_domain_lock)
{
struct auth_domain *dom = container_of(kref, struct auth_domain, ref);
hlist_del(&dom->hash);
hlist_del_rcu(&dom->hash);
dom->flavour->domain_release(dom);
spin_unlock(&auth_domain_lock);
}
@ -175,7 +176,7 @@ auth_domain_lookup(char *name, struct auth_domain *new)
}
}
if (new)
hlist_add_head(&new->hash, head);
hlist_add_head_rcu(&new->hash, head);
spin_unlock(&auth_domain_lock);
return new;
}
@ -183,6 +184,21 @@ EXPORT_SYMBOL_GPL(auth_domain_lookup);
struct auth_domain *auth_domain_find(char *name)
{
return auth_domain_lookup(name, NULL);
struct auth_domain *hp;
struct hlist_head *head;
head = &auth_domain_table[hash_str(name, DN_HASHBITS)];
rcu_read_lock();
hlist_for_each_entry_rcu(hp, head, hash) {
if (strcmp(hp->name, name)==0) {
if (!kref_get_unless_zero(&hp->ref))
hp = NULL;
rcu_read_unlock();
return hp;
}
}
rcu_read_unlock();
return NULL;
}
EXPORT_SYMBOL_GPL(auth_domain_find);

10
net/sunrpc/svcauth_unix.c
View File

@ -37,20 +37,26 @@ struct unix_domain {
extern struct auth_ops svcauth_null;
extern struct auth_ops svcauth_unix;
static void svcauth_unix_domain_release(struct auth_domain *dom)
static void svcauth_unix_domain_release_rcu(struct rcu_head *head)
{
struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head);
struct unix_domain *ud = container_of(dom, struct unix_domain, h);
kfree(dom->name);
kfree(ud);
}
static void svcauth_unix_domain_release(struct auth_domain *dom)
{
call_rcu(&dom->rcu_head, svcauth_unix_domain_release_rcu);
}
struct auth_domain *unix_domain_find(char *name)
{
struct auth_domain *rv;
struct unix_domain *new = NULL;
rv = auth_domain_lookup(name, NULL);
rv = auth_domain_find(name);
while(1) {
if (rv) {
if (new && rv != &new->h)