SUNRPC: Add a backpointer from the struct rpc_cred to the rpc_auth

Cleans up an issue whereby rpcsec_gss uses the rpc_clnt->cl_auth. If we want
to be able to add several rpc_auths to a single rpc_clnt, then this abuse
must go.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

4 files changed, 8 insertions, 1 deletions

diff --git a/include/linux/sunrpc/auth.h b/include/linux/sunrpc/auth.h
index 534cdc7be58d..8ef27afeea73 100644
--- a/include/linux/sunrpc/auth.h
+++ b/include/linux/sunrpc/auth.h
@@ -30,8 +30,11 @@ struct auth_cred {
 /*
  * Client user credentials
  */
+struct rpc_auth;
+struct rpc_credops;
 struct rpc_cred {
         struct hlist_node       cr_hash;        /* hash chain */
+        struct rpc_auth *       cr_auth;
         struct rpc_credops *    cr_ops;
         unsigned long           cr_expire;      /* when to gc */
         atomic_t                cr_count;       /* ref count */
@@ -60,6 +63,7 @@ struct rpc_cred_cache {
         unsigned long           expire;         /* cache expiry interval */
 };
 
+struct rpc_authops;
 struct rpc_auth {
         unsigned int            au_cslack;      /* call cred size estimate */
                                 /* guess at number of u32's auth adds before
diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
index 4e4ccc5b6fea..e894e2fc360d 100644
--- a/net/sunrpc/auth_gss/auth_gss.c
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -386,7 +386,7 @@ static inline int
 gss_refresh_upcall(struct rpc_task *task)
 {
         struct rpc_cred *cred = task->tk_msg.rpc_cred;
-        struct gss_auth *gss_auth = container_of(task->tk_client->cl_auth,
+        struct gss_auth *gss_auth = container_of(cred->cr_auth,
                         struct gss_auth, rpc_auth);
         struct gss_cred *gss_cred = container_of(cred,
                         struct gss_cred, gc_base);
@@ -741,6 +741,7 @@ gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
          * fail to flag the credential as RPCAUTH_CRED_UPTODATE.
          */
         cred->gc_flags = 0;
+        cred->gc_base.cr_auth = auth;
         cred->gc_base.cr_ops = &gss_credops;
         cred->gc_base.cr_flags = RPCAUTH_CRED_NEW;
         cred->gc_service = gss_auth->service;
diff --git a/net/sunrpc/auth_null.c b/net/sunrpc/auth_null.c
index 3df9fccab2f8..890bd9b3794b 100644
--- a/net/sunrpc/auth_null.c
+++ b/net/sunrpc/auth_null.c
@@ -133,6 +133,7 @@ struct rpc_credops	null_credops = {
 
 static
 struct rpc_cred null_cred = {
+        .cr_auth        = &null_auth,
         .cr_ops         = &null_credops,
         .cr_count       = ATOMIC_INIT(1),
         .cr_flags       = RPCAUTH_CRED_UPTODATE,
diff --git a/net/sunrpc/auth_unix.c b/net/sunrpc/auth_unix.c
index 4e7733aee36e..82300b83045e 100644
--- a/net/sunrpc/auth_unix.c
+++ b/net/sunrpc/auth_unix.c
@@ -92,6 +92,7 @@ unx_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
                 if (i < NFS_NGROUPS)
                   cred->uc_gids[i] = NOGROUP;
         }
+        cred->uc_base.cr_auth = &unix_auth;
         cred->uc_base.cr_ops = &unix_credops;
 
         return (struct rpc_cred *) cred;