sunrpc: add auth_unix hash_cred() function

Add a hash_cred() function for auth_unix, using both the
uid and gid from the auth_cred.

Signed-off-by: Frank Sorenson <sorenson@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/net/sunrpc/auth_unix.c b/net/sunrpc/auth_unix.c
index a99278c984e8..4c0c572af2da 100644
--- a/net/sunrpc/auth_unix.c
+++ b/net/sunrpc/auth_unix.c
@@ -46,6 +46,14 @@ unx_destroy(struct rpc_auth *auth)
         rpcauth_clear_credcache(auth->au_credcache);
 }
 
+static int
+unx_hash_cred(struct auth_cred *acred, unsigned int hashbits)
+{
+        return hash_64(from_kgid(&init_user_ns, acred->gid) |
+                ((u64)from_kuid(&init_user_ns, acred->uid) <<
+                        (sizeof(gid_t) * 8)), hashbits);
+}
+
 /*
  * Lookup AUTH_UNIX creds for current process
  */
@@ -220,6 +228,7 @@ const struct rpc_authops authunix_ops = {
         .au_name        = "UNIX",
         .create         = unx_create,
         .destroy        = unx_destroy,
+        .hash_cred      = unx_hash_cred,
         .lookup_cred    = unx_lookup_cred,
         .crcreate       = unx_create_cred,
 };