svc: Move the authinfo cache to svc_xprt.

Move the authinfo cache to svc_xprt. This allows both the TCP and RDMA
transports to share this logic. A flag bit is used to determine if
auth information is to be cached or not. Previously, this code looked
at the transport protocol.

I've also changed the spin_lock/unlock logic so that a lock is not taken for
transports that are not caching auth info.

Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
Acked-by: Neil Brown <neilb@suse.de>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Greg Banks <gnb@sgi.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

1 files changed, 29 insertions, 25 deletions

diff --git a/net/sunrpc/svcauth_unix.c b/net/sunrpc/svcauth_unix.c
index 411479411b21..6815157bd65c 100644
--- a/net/sunrpc/svcauth_unix.c
+++ b/net/sunrpc/svcauth_unix.c
@@ -384,41 +384,45 @@ void svcauth_unix_purge(void)
 static inline struct ip_map *
 ip_map_cached_get(struct svc_rqst *rqstp)
 {
-        struct ip_map *ipm;
-        struct svc_sock *svsk = rqstp->rq_sock;
-        spin_lock(&svsk->sk_lock);
-        ipm = svsk->sk_info_authunix;
-        if (ipm != NULL) {
-                if (!cache_valid(&ipm->h)) {
-                        /*
-                         * The entry has been invalidated since it was
-                         * remembered, e.g. by a second mount from the
-                         * same IP address.
-                         */
-                        svsk->sk_info_authunix = NULL;
-                        spin_unlock(&svsk->sk_lock);
-                        cache_put(&ipm->h, &ip_map_cache);
-                        return NULL;
+        struct ip_map *ipm = NULL;
+        struct svc_xprt *xprt = rqstp->rq_xprt;
+
+        if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
+                spin_lock(&xprt->xpt_lock);
+                ipm = xprt->xpt_auth_cache;
+                if (ipm != NULL) {
+                        if (!cache_valid(&ipm->h)) {
+                                /*
+                                 * The entry has been invalidated since it was
+                                 * remembered, e.g. by a second mount from the
+                                 * same IP address.
+                                 */
+                                xprt->xpt_auth_cache = NULL;
+                                spin_unlock(&xprt->xpt_lock);
+                                cache_put(&ipm->h, &ip_map_cache);
+                                return NULL;
+                        }
+                        cache_get(&ipm->h);
                 }
-                cache_get(&ipm->h);
+                spin_unlock(&xprt->xpt_lock);
         }
-        spin_unlock(&svsk->sk_lock);
         return ipm;
 }
 
 static inline void
 ip_map_cached_put(struct svc_rqst *rqstp, struct ip_map *ipm)
 {
-        struct svc_sock *svsk = rqstp->rq_sock;
+        struct svc_xprt *xprt = rqstp->rq_xprt;
 
-        spin_lock(&svsk->sk_lock);
-        if (svsk->sk_sock->type == SOCK_STREAM &&
-            svsk->sk_info_authunix == NULL) {
-                /* newly cached, keep the reference */
-                svsk->sk_info_authunix = ipm;
-                ipm = NULL;
+        if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
+                spin_lock(&xprt->xpt_lock);
+                if (xprt->xpt_auth_cache == NULL) {
+                        /* newly cached, keep the reference */
+                        xprt->xpt_auth_cache = ipm;
+                        ipm = NULL;
+                }
+                spin_unlock(&xprt->xpt_lock);
         }
-        spin_unlock(&svsk->sk_lock);
         if (ipm)
                 cache_put(&ipm->h, &ip_map_cache);
 }