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

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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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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)