NFSv4: Retrieve ACCESS on open if we're not using NFS4_CREATE_EXCLUSIVE

NFS4_CREATE_EXCLUSIVE does not allow the caller to set an access mode,
so for most Linux filesystems, the access call ends up returning no
permissions. However both NFS4_CREATE_EXCLUSIVE4_1 and
NFS4_CREATE_GUARDED allow the client to set the access mode.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

fs/nfs/nfs4proc.c

@@ -1388,9 +1388,6 @@ static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 					sizeof(p->o_arg.u.verifier.data));
 		}
 	}
-	/* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
-	 * will return permission denied for all bits until close */
-	if (!(flags & O_EXCL)) {
 	/* ask server to check for all possible rights as results
 	 * are cached */
 	switch (p->o_arg.claim) {
@@ -1398,18 +1395,16 @@ static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 		break;
 	case NFS4_OPEN_CLAIM_NULL:
 	case NFS4_OPEN_CLAIM_FH:
-			p->o_arg.access = NFS4_ACCESS_READ |
-				NFS4_ACCESS_MODIFY |
-				NFS4_ACCESS_EXTEND |
+		p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
+				  NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE |
 				  NFS4_ACCESS_EXECUTE;
 #ifdef CONFIG_NFS_V4_2
-			if (server->caps & NFS_CAP_XATTR)
-				p->o_arg.access |= NFS4_ACCESS_XAREAD |
-				    NFS4_ACCESS_XAWRITE |
+		if (!(server->caps & NFS_CAP_XATTR))
+			break;
+		p->o_arg.access |= NFS4_ACCESS_XAREAD | NFS4_ACCESS_XAWRITE |
 				   NFS4_ACCESS_XALIST;
 #endif
 	}
-	}
 	p->o_arg.clientid = server->nfs_client->cl_clientid;
 	p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 	p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
@@ -2472,11 +2467,15 @@ static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 	/* Set the create mode (note dependency on the session type) */
 	data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
 	if (data->o_arg.open_flags & O_EXCL) {
+		data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
+		if (clp->cl_mvops->minor_version == 0) {
 			data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
-		if (nfs4_has_persistent_session(clp))
+			/* don't put an ACCESS op in OPEN compound if O_EXCL,
+			 * because ACCESS will return permission denied for
+			 * all bits until close */
+			data->o_res.access_request = data->o_arg.access = 0;
+		} else if (nfs4_has_persistent_session(clp))
 			data->o_arg.createmode = NFS4_CREATE_GUARDED;
-		else if (clp->cl_mvops->minor_version > 0)
-			data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
 	}
 	return;
 unlock_no_action: