NFS/NFSD/SUNRPC: replace generic creds with 'struct cred'.

SUNRPC has two sorts of credentials, both of which appear as
"struct rpc_cred".
There are "generic credentials" which are supplied by clients
such as NFS and passed in 'struct rpc_message' to indicate
which user should be used to authorize the request, and there
are low-level credentials such as AUTH_NULL, AUTH_UNIX, AUTH_GSS
which describe the credential to be sent over the wires.

This patch replaces all the generic credentials by 'struct cred'
pointers - the credential structure used throughout Linux.

For machine credentials, there is a special 'struct cred *' pointer
which is statically allocated and recognized where needed as
having a special meaning.  A look-up of a low-level cred will
map this to a machine credential.

Signed-off-by: NeilBrown <neilb@suse.com>
Acked-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

33 files changed, 261 insertions, 343 deletions

diff --git a/fs/lockd/clntproc.c b/fs/lockd/clntproc.c
index d20b92f271c2..7c80c28df971 100644
--- a/fs/lockd/clntproc.c
+++ b/fs/lockd/clntproc.c
@@ -256,7 +256,7 @@ static int nlm_wait_on_grace(wait_queue_head_t *queue)
  * Generic NLM call
  */
 static int
-nlmclnt_call(struct rpc_cred *cred, struct nlm_rqst *req, u32 proc)
+nlmclnt_call(const struct cred *cred, struct nlm_rqst *req, u32 proc)
 {
 	struct nlm_host	*host = req->a_host;
 	struct rpc_clnt	*clnt;
@@ -401,7 +401,7 @@ int nlm_async_reply(struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *t
  *      completion in order to be able to correctly track the lock
  *      state.
  */
-static int nlmclnt_async_call(struct rpc_cred *cred, struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *tk_ops)
+static int nlmclnt_async_call(const struct cred *cred, struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *tk_ops)
 {
 	struct rpc_message msg = {
 		.rpc_argp	= &req->a_args,
@@ -510,7 +510,7 @@ static int do_vfs_lock(struct file_lock *fl)
 static int
 nlmclnt_lock(struct nlm_rqst *req, struct file_lock *fl)
 {
-	struct rpc_cred *cred = nfs_file_cred(fl->fl_file);
+	const struct cred *cred = nfs_file_cred(fl->fl_file);
 	struct nlm_host	*host = req->a_host;
 	struct nlm_res	*resp = &req->a_res;
 	struct nlm_wait *block = NULL;
diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index d3781cd983f6..690221747b47 100644
--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -584,7 +584,7 @@ static int decode_sector_number(__be32 **rp, sector_t *sp)
 
 static struct nfs4_deviceid_node *
 bl_find_get_deviceid(struct nfs_server *server,
-		const struct nfs4_deviceid *id, struct rpc_cred *cred,
+		const struct nfs4_deviceid *id, const struct cred *cred,
 		gfp_t gfp_mask)
 {
 	struct nfs4_deviceid_node *node;
diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index 6ec2f78c1e19..885363ca8569 100644
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -26,10 +26,8 @@
 
 static void nfs_free_delegation(struct nfs_delegation *delegation)
 {
-	if (delegation->cred) {
-		put_rpccred(delegation->cred);
-		delegation->cred = NULL;
-	}
+	put_cred(delegation->cred);
+	delegation->cred = NULL;
 	kfree_rcu(delegation, rcu);
 }
 
@@ -178,13 +176,13 @@ again:
  * @pagemod_limit: write delegation "space_limit"
  *
  */
-void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred,
+void nfs_inode_reclaim_delegation(struct inode *inode, const struct cred *cred,
 				  fmode_t type,
 				  const nfs4_stateid *stateid,
 				  unsigned long pagemod_limit)
 {
 	struct nfs_delegation *delegation;
-	struct rpc_cred *oldcred = NULL;
+	const struct cred *oldcred = NULL;
 
 	rcu_read_lock();
 	delegation = rcu_dereference(NFS_I(inode)->delegation);
@@ -195,12 +193,12 @@ void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred,
 			delegation->type = type;
 			delegation->pagemod_limit = pagemod_limit;
 			oldcred = delegation->cred;
-			delegation->cred = get_rpccred(cred);
+			delegation->cred = get_cred(cred);
 			clear_bit(NFS_DELEGATION_NEED_RECLAIM,
 				  &delegation->flags);
 			spin_unlock(&delegation->lock);
 			rcu_read_unlock();
-			put_rpccred(oldcred);
+			put_cred(oldcred);
 			trace_nfs4_reclaim_delegation(inode, type);
 			return;
 		}
@@ -341,7 +339,7 @@ nfs_update_inplace_delegation(struct nfs_delegation *delegation,
  *
  * Returns zero on success, or a negative errno value.
  */
-int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred,
+int nfs_inode_set_delegation(struct inode *inode, const struct cred *cred,
 				  fmode_t type,
 				  const nfs4_stateid *stateid,
 				  unsigned long pagemod_limit)
@@ -360,7 +358,7 @@ int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred,
 	delegation->type = type;
 	delegation->pagemod_limit = pagemod_limit;
 	delegation->change_attr = inode_peek_iversion_raw(inode);
-	delegation->cred = get_rpccred(cred);
+	delegation->cred = get_cred(cred);
 	delegation->inode = inode;
 	delegation->flags = 1<<NFS_DELEGATION_REFERENCED;
 	spin_lock_init(&delegation->lock);
@@ -1047,7 +1045,7 @@ void nfs_reap_expired_delegations(struct nfs_client *clp)
 	struct nfs_delegation *delegation;
 	struct nfs_server *server;
 	struct inode *inode;
-	struct rpc_cred *cred;
+	const struct cred *cred;
 	nfs4_stateid stateid;
 
 restart:
@@ -1069,7 +1067,7 @@ restart:
 				nfs_sb_deactive(server->super);
 				goto restart;
 			}
-			cred = get_rpccred_rcu(delegation->cred);
+			cred = get_cred_rcu(delegation->cred);
 			nfs4_stateid_copy(&stateid, &delegation->stateid);
 			clear_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags);
 			rcu_read_unlock();
@@ -1078,7 +1076,7 @@ restart:
 				nfs_revoke_delegation(inode, &stateid);
 				nfs_inode_find_state_and_recover(inode, &stateid);
 			}
-			put_rpccred(cred);
+			put_cred(cred);
 			if (nfs4_server_rebooted(clp)) {
 				nfs_inode_mark_test_expired_delegation(server,inode);
 				iput(inode);
@@ -1173,7 +1171,7 @@ out:
  * otherwise "false" is returned.
  */
 bool nfs4_copy_delegation_stateid(struct inode *inode, fmode_t flags,
-		nfs4_stateid *dst, struct rpc_cred **cred)
+		nfs4_stateid *dst, const struct cred **cred)
 {
 	struct nfs_inode *nfsi = NFS_I(inode);
 	struct nfs_delegation *delegation;
@@ -1187,7 +1185,7 @@ bool nfs4_copy_delegation_stateid(struct inode *inode, fmode_t flags,
 		nfs4_stateid_copy(dst, &delegation->stateid);
 		nfs_mark_delegation_referenced(delegation);
 		if (cred)
-			*cred = get_rpccred(delegation->cred);
+			*cred = get_cred(delegation->cred);
 	}
 	rcu_read_unlock();
 	return ret;
diff --git a/fs/nfs/delegation.h b/fs/nfs/delegation.h
index bb1ef8c37af4..dcbf3394ba0e 100644
--- a/fs/nfs/delegation.h
+++ b/fs/nfs/delegation.h
@@ -15,7 +15,7 @@
  */
 struct nfs_delegation {
 	struct list_head super_list;
-	struct rpc_cred *cred;
+	const struct cred *cred;
 	struct inode *inode;
 	nfs4_stateid stateid;
 	fmode_t type;
@@ -36,9 +36,9 @@ enum {
 	NFS_DELEGATION_TEST_EXPIRED,
 };
 
-int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred,
+int nfs_inode_set_delegation(struct inode *inode, const struct cred *cred,
 		fmode_t type, const nfs4_stateid *stateid, unsigned long pagemod_limit);
-void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred,
+void nfs_inode_reclaim_delegation(struct inode *inode, const struct cred *cred,
 		fmode_t type, const nfs4_stateid *stateid, unsigned long pagemod_limit);
 int nfs4_inode_return_delegation(struct inode *inode);
 int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid);
@@ -60,10 +60,10 @@ void nfs_mark_test_expired_all_delegations(struct nfs_client *clp);
 void nfs_reap_expired_delegations(struct nfs_client *clp);
 
 /* NFSv4 delegation-related procedures */
-int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync);
+int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync);
 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid, fmode_t type);
 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid);
-bool nfs4_copy_delegation_stateid(struct inode *inode, fmode_t flags, nfs4_stateid *dst, struct rpc_cred **cred);
+bool nfs4_copy_delegation_stateid(struct inode *inode, fmode_t flags, nfs4_stateid *dst, const struct cred **cred);
 bool nfs4_refresh_delegation_stateid(nfs4_stateid *dst, struct inode *inode);
 
 void nfs_mark_delegation_referenced(struct nfs_delegation *delegation);
diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c
index 1d1c5d127928..63abe705f4ca 100644
--- a/fs/nfs/flexfilelayout/flexfilelayout.c
+++ b/fs/nfs/flexfilelayout/flexfilelayout.c
@@ -224,16 +224,14 @@ static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags)
 
 static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror)
 {
-	struct rpc_cred	*cred;
+	const struct cred	*cred;
 
 	ff_layout_remove_mirror(mirror);
 	kfree(mirror->fh_versions);
 	cred = rcu_access_pointer(mirror->ro_cred);
-	if (cred)
-		put_rpccred(cred);
+	put_cred(cred);
 	cred = rcu_access_pointer(mirror->rw_cred);
-	if (cred)
-		put_rpccred(cred);
+	put_cred(cred);
 	nfs4_ff_layout_put_deviceid(mirror->mirror_ds);
 	kfree(mirror);
 }
@@ -411,9 +409,8 @@ ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
 
 	for (i = 0; i < fls->mirror_array_cnt; i++) {
 		struct nfs4_ff_layout_mirror *mirror;
-		struct auth_cred acred = {};
-		struct rpc_cred	__rcu *cred;
 		struct cred *kcred;
+		const struct cred *cred;
 		kuid_t uid;
 		kgid_t gid;
 		u32 ds_count, fh_count, id;
@@ -504,15 +501,7 @@ ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
 			goto out_err_free;
 		kcred->fsuid = uid;
 		kcred->fsgid = gid;
-		acred.cred = kcred;
-
-		/* find the cred for it */
-		rcu_assign_pointer(cred, rpc_lookup_generic_cred(&acred, 0, gfp_flags));
-		put_cred(kcred);
-		if (IS_ERR(cred)) {
-			rc = PTR_ERR(cred);
-			goto out_err_free;
-		}
+		cred = kcred;
 
 		if (lgr->range.iomode == IOMODE_READ)
 			rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
@@ -1714,7 +1703,7 @@ ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
 	struct pnfs_layout_segment *lseg = hdr->lseg;
 	struct nfs4_pnfs_ds *ds;
 	struct rpc_clnt *ds_clnt;
-	struct rpc_cred *ds_cred;
+	const struct cred *ds_cred;
 	loff_t offset = hdr->args.offset;
 	u32 idx = hdr->pgio_mirror_idx;
 	int vers;
@@ -1765,7 +1754,7 @@ ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
 			  vers == 3 ? &ff_layout_read_call_ops_v3 :
 				      &ff_layout_read_call_ops_v4,
 			  0, RPC_TASK_SOFTCONN);
-	put_rpccred(ds_cred);
+	put_cred(ds_cred);
 	return PNFS_ATTEMPTED;
 
 out_failed:
@@ -1781,7 +1770,7 @@ ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
 	struct pnfs_layout_segment *lseg = hdr->lseg;
 	struct nfs4_pnfs_ds *ds;
 	struct rpc_clnt *ds_clnt;
-	struct rpc_cred *ds_cred;
+	const struct cred *ds_cred;
 	loff_t offset = hdr->args.offset;
 	int vers;
 	struct nfs_fh *fh;
@@ -1830,7 +1819,7 @@ ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
 			  vers == 3 ? &ff_layout_write_call_ops_v3 :
 				      &ff_layout_write_call_ops_v4,
 			  sync, RPC_TASK_SOFTCONN);
-	put_rpccred(ds_cred);
+	put_cred(ds_cred);
 	return PNFS_ATTEMPTED;
 
 out_failed:
@@ -1860,7 +1849,7 @@ static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
 	struct pnfs_layout_segment *lseg = data->lseg;
 	struct nfs4_pnfs_ds *ds;
 	struct rpc_clnt *ds_clnt;
-	struct rpc_cred *ds_cred;
+	const struct cred *ds_cred;
 	u32 idx;
 	int vers, ret;
 	struct nfs_fh *fh;
@@ -1900,7 +1889,7 @@ static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
 				   vers == 3 ? &ff_layout_commit_call_ops_v3 :
 					       &ff_layout_commit_call_ops_v4,
 				   how, RPC_TASK_SOFTCONN);
-	put_rpccred(ds_cred);
+	put_cred(ds_cred);
 	return ret;
 out_err:
 	pnfs_generic_prepare_to_resend_writes(data);
diff --git a/fs/nfs/flexfilelayout/flexfilelayout.h b/fs/nfs/flexfilelayout/flexfilelayout.h
index de50a342d5a5..c2626bad466b 100644
--- a/fs/nfs/flexfilelayout/flexfilelayout.h
+++ b/fs/nfs/flexfilelayout/flexfilelayout.h
@@ -81,8 +81,8 @@ struct nfs4_ff_layout_mirror {
 	u32				fh_versions_cnt;
 	struct nfs_fh			*fh_versions;
 	nfs4_stateid			stateid;
-	struct rpc_cred	__rcu		*ro_cred;
-	struct rpc_cred	__rcu		*rw_cred;
+	const struct cred __rcu		*ro_cred;
+	const struct cred __rcu		*rw_cred;
 	refcount_t			ref;
 	spinlock_t			lock;
 	unsigned long			flags;
@@ -229,8 +229,8 @@ nfs4_ff_find_or_create_ds_client(struct pnfs_layout_segment *lseg,
 				 u32 ds_idx,
 				 struct nfs_client *ds_clp,
 				 struct inode *inode);
-struct rpc_cred *ff_layout_get_ds_cred(struct pnfs_layout_segment *lseg,
-				       u32 ds_idx, struct rpc_cred *mdscred);
+const struct cred *ff_layout_get_ds_cred(struct pnfs_layout_segment *lseg,
+				       u32 ds_idx, const struct cred *mdscred);
 bool ff_layout_avoid_mds_available_ds(struct pnfs_layout_segment *lseg);
 bool ff_layout_avoid_read_on_rw(struct pnfs_layout_segment *lseg);
 
diff --git a/fs/nfs/flexfilelayout/flexfilelayoutdev.c b/fs/nfs/flexfilelayout/flexfilelayoutdev.c
index d23347389626..11766a74216d 100644
--- a/fs/nfs/flexfilelayout/flexfilelayoutdev.c
+++ b/fs/nfs/flexfilelayout/flexfilelayoutdev.c
@@ -330,10 +330,10 @@ int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo,
 	return 0;
 }
 
-static struct rpc_cred *
+static const struct cred *
 ff_layout_get_mirror_cred(struct nfs4_ff_layout_mirror *mirror, u32 iomode)
 {
-	struct rpc_cred *cred, __rcu **pcred;
+	const struct cred *cred, __rcu **pcred;
 
 	if (iomode == IOMODE_READ)
 		pcred = &mirror->ro_cred;
@@ -346,7 +346,7 @@ ff_layout_get_mirror_cred(struct nfs4_ff_layout_mirror *mirror, u32 iomode)
 		if (!cred)
 			break;
 
-		cred = get_rpccred_rcu(cred);
+		cred = get_cred_rcu(cred);
 	} while(!cred);
 	rcu_read_unlock();
 	return cred;
@@ -465,19 +465,19 @@ out:
 	return ds;
 }
 
-struct rpc_cred *
+const struct cred *
 ff_layout_get_ds_cred(struct pnfs_layout_segment *lseg, u32 ds_idx,
-		      struct rpc_cred *mdscred)
+		      const struct cred *mdscred)
 {
 	struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx);
-	struct rpc_cred *cred;
+	const struct cred *cred;
 
 	if (mirror && !mirror->mirror_ds->ds_versions[0].tightly_coupled) {
 		cred = ff_layout_get_mirror_cred(mirror, lseg->pls_range.iomode);
 		if (!cred)
-			cred = get_rpccred(mdscred);
+			cred = get_cred(mdscred);
 	} else {
-		cred = get_rpccred(mdscred);
+		cred = get_cred(mdscred);
 	}
 	return cred;
 }
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index aea015743172..094775ea0781 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -950,13 +950,11 @@ struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
 						struct file *filp)
 {
 	struct nfs_open_context *ctx;
-	struct rpc_cred *cred = rpc_lookup_cred();
-	if (IS_ERR(cred))
-		return ERR_CAST(cred);
+	const struct cred *cred = get_current_cred();
 
 	ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
 	if (!ctx) {
-		put_rpccred(cred);
+		put_cred(cred);
 		return ERR_PTR(-ENOMEM);
 	}
 	nfs_sb_active(dentry->d_sb);
@@ -998,8 +996,7 @@ static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
 	}
 	if (inode != NULL)
 		NFS_PROTO(inode)->close_context(ctx, is_sync);
-	if (ctx->cred != NULL)
-		put_rpccred(ctx->cred);
+	put_cred(ctx->cred);
 	dput(ctx->dentry);
 	nfs_sb_deactive(sb);
 	put_rpccred(ctx->ll_cred);
@@ -1044,7 +1041,7 @@ EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
 /*
  * Given an inode, search for an open context with the desired characteristics
  */
-struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
+struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode)
 {
 	struct nfs_inode *nfsi = NFS_I(inode);
 	struct nfs_open_context *pos, *ctx = NULL;
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index ecb6d4317ab4..78d83b4bc398 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -254,7 +254,7 @@ struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
 void nfs_pgio_header_free(struct nfs_pgio_header *);
 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
-		      struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops,
+		      const struct cred *cred, const struct nfs_rpc_ops *rpc_ops,
 		      const struct rpc_call_ops *call_ops, int how, int flags);
 void nfs_free_request(struct nfs_page *req);
 struct nfs_pgio_mirror *
@@ -269,7 +269,7 @@ static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc)
 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
 		const struct nfs_open_context *ctx2)
 {
-	return ctx1->cred == ctx2->cred && ctx1->state == ctx2->state;
+	return cred_fscmp(ctx1->cred, ctx2->cred) == 0 && ctx1->state == ctx2->state;
 }
 
 /* nfs2xdr.c */
@@ -564,10 +564,10 @@ extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
 			    const struct nfs_client_initdata *);
 extern int nfs40_walk_client_list(struct nfs_client *clp,
 				struct nfs_client **result,
-				struct rpc_cred *cred);
+				const struct cred *cred);
 extern int nfs41_walk_client_list(struct nfs_client *clp,
 				struct nfs_client **result,
-				struct rpc_cred *cred);
+				const struct cred *cred);
 extern int nfs4_test_session_trunk(struct rpc_clnt *,
 				struct rpc_xprt *,
 				void *);
diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c
index a2e9e09c3772..a3ad2d46fd42 100644
--- a/fs/nfs/nfs3proc.c
+++ b/fs/nfs/nfs3proc.c
@@ -195,20 +195,15 @@ static int nfs3_proc_access(struct inode *inode, struct nfs_access_entry *entry)
 		.access		= entry->mask,
 	};
 	struct nfs3_accessres	res;
-	struct auth_cred acred = {
-		.cred		= entry->cred,
-	};
 	struct rpc_message msg = {
 		.rpc_proc	= &nfs3_procedures[NFS3PROC_ACCESS],
 		.rpc_argp	= &arg,
 		.rpc_resp	= &res,
-		.rpc_cred	= rpc_lookup_generic_cred(&acred, 0, GFP_NOFS),
+		.rpc_cred	= entry->cred,
 	};
 	int status = -ENOMEM;
 
 	dprintk("NFS call  access\n");
-	if (!msg.rpc_cred)
-		goto out;
 	res.fattr = nfs_alloc_fattr();
 	if (res.fattr == NULL)
 		goto out;
@@ -219,8 +214,6 @@ static int nfs3_proc_access(struct inode *inode, struct nfs_access_entry *entry)
 		nfs_access_set_mask(entry, res.access);
 	nfs_free_fattr(res.fattr);
 out:
-	if (msg.rpc_cred)
-		put_rpccred(msg.rpc_cred);
 	dprintk("NFS reply access: %d\n", status);
 	return status;
 }
@@ -631,15 +624,11 @@ nfs3_proc_readdir(struct dentry *dentry, const struct cred *cred,
 		.verf		= verf,
 		.plus		= plus
 	};
-	struct auth_cred acred = {
-		.cred		= cred,
-	};
 	struct rpc_message	msg = {
 		.rpc_proc	= &nfs3_procedures[NFS3PROC_READDIR],
 		.rpc_argp	= &arg,
 		.rpc_resp	= &res,
-		.rpc_cred	= rpc_lookup_generic_cred(&acred,
-							  0, GFP_NOFS),
+		.rpc_cred	= cred,
 	};
 	int status = -ENOMEM;
 
@@ -649,8 +638,6 @@ nfs3_proc_readdir(struct dentry *dentry, const struct cred *cred,
 	dprintk("NFS call  readdir%s %d\n",
 			plus? "plus" : "", (unsigned int) cookie);
 
-	if (!msg.rpc_cred)
-		return -ENOMEM;
 	res.dir_attr = nfs_alloc_fattr();
 	if (res.dir_attr == NULL)
 		goto out;
@@ -662,7 +649,6 @@ nfs3_proc_readdir(struct dentry *dentry, const struct cred *cred,
 
 	nfs_free_fattr(res.dir_attr);
 out:
-	put_rpccred(msg.rpc_cred);
 	dprintk("NFS reply readdir%s: %d\n",
 			plus? "plus" : "", status);
 	return status;
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index eab41490ce58..993378a8f14f 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -62,7 +62,7 @@ struct nfs4_minor_version_ops {
 	void	(*free_lock_state)(struct nfs_server *,
 			struct nfs4_lock_state *);
 	int	(*test_and_free_expired)(struct nfs_server *,
-			nfs4_stateid *, struct rpc_cred *);
+			nfs4_stateid *, const struct cred *);
 	struct nfs_seqid *
 		(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
 	int	(*session_trunk)(struct rpc_clnt *, struct rpc_xprt *, void *);
@@ -107,7 +107,7 @@ struct nfs4_state_owner {
 	unsigned long        so_expires;
 	struct rb_node	     so_server_node;
 
-	struct rpc_cred	     *so_cred;	 /* Associated cred */
+	const struct cred    *so_cred;	 /* Associated cred */
 
 	spinlock_t	     so_lock;
 	atomic_t	     so_count;
@@ -212,10 +212,10 @@ struct nfs4_state_recovery_ops {
 	int state_flag_bit;
 	int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
 	int (*recover_lock)(struct nfs4_state *, struct file_lock *);
-	int (*establish_clid)(struct nfs_client *, struct rpc_cred *);
-	int (*reclaim_complete)(struct nfs_client *, struct rpc_cred *);
+	int (*establish_clid)(struct nfs_client *, const struct cred *);
+	int (*reclaim_complete)(struct nfs_client *, const struct cred *);
 	int (*detect_trunking)(struct nfs_client *, struct nfs_client **,
-		struct rpc_cred *);
+		const struct cred *);
 };
 
 struct nfs4_opendata {
@@ -245,19 +245,19 @@ struct nfs4_opendata {
 
 struct nfs4_add_xprt_data {
 	struct nfs_client	*clp;
-	struct rpc_cred		*cred;
+	const struct cred	*cred;
 };
 
 struct nfs4_state_maintenance_ops {
-	int (*sched_state_renewal)(struct nfs_client *, struct rpc_cred *, unsigned);
-	struct rpc_cred * (*get_state_renewal_cred)(struct nfs_client *);
-	int (*renew_lease)(struct nfs_client *, struct rpc_cred *);
+	int (*sched_state_renewal)(struct nfs_client *, const struct cred *, unsigned);
+	const struct cred * (*get_state_renewal_cred)(struct nfs_client *);
+	int (*renew_lease)(struct nfs_client *, const struct cred *);
 };
 
 struct nfs4_mig_recovery_ops {
 	int (*get_locations)(struct inode *, struct nfs4_fs_locations *,
-		struct page *, struct rpc_cred *);
-	int (*fsid_present)(struct inode *, struct rpc_cred *);
+		struct page *, const struct cred *);
+	int (*fsid_present)(struct inode *, const struct cred *);
 };
 
 extern const struct dentry_operations nfs4_dentry_operations;
@@ -286,21 +286,21 @@ extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *,
 			  struct rpc_message *, struct nfs4_sequence_args *,
 			  struct nfs4_sequence_res *, int);
 extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int);
-extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *);
-extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *);
+extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, const struct cred *, struct nfs4_setclientid_res *);
+extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, const struct cred *);
 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool);
-extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, struct rpc_cred *cred);
-extern int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred);
+extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, const struct cred *cred);
+extern int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred);
 extern int nfs4_destroy_clientid(struct nfs_client *clp);
-extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *);
-extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *);
+extern int nfs4_init_clientid(struct nfs_client *, const struct cred *);
+extern int nfs41_init_clientid(struct nfs_client *, const struct cred *);
 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
 				  struct nfs4_fs_locations *, struct page *);
 extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *,
-		struct page *page, struct rpc_cred *);
-extern int nfs4_proc_fsid_present(struct inode *, struct rpc_cred *);
+		struct page *page, const struct cred *);
+extern int nfs4_proc_fsid_present(struct inode *, const struct cred *);
 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, const struct qstr *,
 			    struct nfs_fh *, struct nfs_fattr *);
 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
@@ -312,8 +312,8 @@ extern int nfs4_set_rw_stateid(nfs4_stateid *stateid,
 
 #if defined(CONFIG_NFS_V4_1)
 extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *);
-extern int nfs4_proc_create_session(struct nfs_client *, struct rpc_cred *);
-extern int nfs4_proc_destroy_session(struct nfs4_session *, struct rpc_cred *);
+extern int nfs4_proc_create_session(struct nfs_client *, const struct cred *);
+extern int nfs4_proc_destroy_session(struct nfs4_session *, const struct cred *);
 extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
 		struct nfs_fsinfo *fsinfo);
 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
@@ -443,16 +443,16 @@ extern void nfs4_set_lease_period(struct nfs_client *clp,
 
 
 /* nfs4state.c */
-struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp);
-struct rpc_cred *nfs4_get_machine_cred(struct nfs_client *clp);
-struct rpc_cred *nfs4_get_renew_cred(struct nfs_client *clp);
+const struct cred *nfs4_get_clid_cred(struct nfs_client *clp);
+const struct cred *nfs4_get_machine_cred(struct nfs_client *clp);
+const struct cred *nfs4_get_renew_cred(struct nfs_client *clp);
 int nfs4_discover_server_trunking(struct nfs_client *clp,
 			struct nfs_client **);
 int nfs40_discover_server_trunking(struct nfs_client *clp,
-			struct nfs_client **, struct rpc_cred *);
+			struct nfs_client **, const struct cred *);
 #if defined(CONFIG_NFS_V4_1)
 int nfs41_discover_server_trunking(struct nfs_client *clp,
-			struct nfs_client **, struct rpc_cred *);
+			struct nfs_client **, const struct cred *);
 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
 extern void nfs41_notify_server(struct nfs_client *);
 #else
@@ -461,7 +461,7 @@ static inline void nfs4_schedule_session_recovery(struct nfs4_session *session,
 }
 #endif /* CONFIG_NFS_V4_1 */
 
-extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *, gfp_t);
+extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, const struct cred *, gfp_t);
 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
 extern void nfs4_purge_state_owners(struct nfs_server *);
 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
@@ -487,7 +487,7 @@ extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
 extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t,
 		const struct nfs_lock_context *, nfs4_stateid *,
-		struct rpc_cred **);
+		const struct cred **);
 extern bool nfs4_refresh_open_stateid(nfs4_stateid *dst,
 		struct nfs4_state *state);
 extern bool nfs4_copy_open_stateid(nfs4_stateid *dst,
diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c
index 8f53455c4765..2548405da1f7 100644
--- a/fs/nfs/nfs4client.c
+++ b/fs/nfs/nfs4client.c
@@ -545,7 +545,7 @@ static int nfs4_match_client(struct nfs_client  *pos,  struct nfs_client *new,
  */
 int nfs40_walk_client_list(struct nfs_client *new,
 			   struct nfs_client **result,
-			   struct rpc_cred *cred)
+			   const struct cred *cred)
 {
 	struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
 	struct nfs_client *pos, *prev = NULL;
@@ -711,7 +711,7 @@ out_err:
  */
 int nfs41_walk_client_list(struct nfs_client *new,