NFSv4: Make NFSv4 ACCESS calls return attributes too...

It doesn't really make sense to cache an access call without also
revalidating the attributes.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/nfs4proc.c

@@ -62,7 +62,6 @@ struct nfs4_opendata;
 static int _nfs4_proc_open(struct nfs4_opendata *data);
 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
-static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
@@ -1726,10 +1725,16 @@ static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh
 
 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
 {
+	struct nfs_server *server = NFS_SERVER(inode);
+	struct nfs_fattr fattr;
 	struct nfs4_accessargs args = {
 		.fh = NFS_FH(inode),
+		.bitmask = server->attr_bitmask,
+	};
+	struct nfs4_accessres res = {
+		.server = server,
+		.fattr = &fattr,
 	};
-	struct nfs4_accessres res = { 0 };
 	struct rpc_message msg = {
 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
 		.rpc_argp = &args,
@@ -1755,6 +1760,7 @@ static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry
 		if (mode & MAY_EXEC)
 			args.access |= NFS4_ACCESS_EXECUTE;
 	}
+	nfs_fattr_init(&fattr);
 	status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 	if (!status) {
 		entry->mask = 0;
@@ -1764,6 +1770,7 @@ static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry
 			entry->mask |= MAY_WRITE;
 		if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
 			entry->mask |= MAY_EXEC;
+		nfs_refresh_inode(inode, &fattr);
 	}
 	return status;
 }

fs/nfs/nfs4xdr.c

@@ -376,10 +376,12 @@ static int nfs4_stat_to_errno(int);
 				decode_locku_maxsz)
 #define NFS4_enc_access_sz	(compound_encode_hdr_maxsz + \
 				encode_putfh_maxsz + \
-				encode_access_maxsz)
+				encode_access_maxsz + \
+				encode_getattr_maxsz)
 #define NFS4_dec_access_sz	(compound_decode_hdr_maxsz + \
 				decode_putfh_maxsz + \
-				decode_access_maxsz)
+				decode_access_maxsz + \
+				decode_getattr_maxsz)
 #define NFS4_enc_getattr_sz	(compound_encode_hdr_maxsz + \
 				encode_putfh_maxsz + \
 				encode_getattr_maxsz)
@@ -1375,14 +1377,20 @@ static int nfs4_xdr_enc_access(struct rpc_rqst *req, __be32 *p, const struct nfs
 {
 	struct xdr_stream xdr;
 	struct compound_hdr hdr = {
-		.nops = 2,
+		.nops = 3,
 	};
 	int status;
 
 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
 	encode_compound_hdr(&xdr, &hdr);
-	if ((status = encode_putfh(&xdr, args->fh)) == 0)
-		status = encode_access(&xdr, args->access);
+	status = encode_putfh(&xdr, args->fh);
+	if (status != 0)
+		goto out;
+	status = encode_access(&xdr, args->access);
+	if (status != 0)
+		goto out;
+	status = encode_getfattr(&xdr, args->bitmask);
+out:
 	return status;
 }
 
@@ -3784,8 +3792,13 @@ static int nfs4_xdr_dec_access(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_ac
 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
 	if ((status = decode_compound_hdr(&xdr, &hdr)) != 0)
 		goto out;
-	if ((status = decode_putfh(&xdr)) == 0)
-		status = decode_access(&xdr, res);
+	status = decode_putfh(&xdr);
+	if (status != 0)
+		goto out;
+	status = decode_access(&xdr, res);
+	if (status != 0)
+		goto out;
+	decode_getfattr(&xdr, res->fattr, res->server);
 out:
 	return status;
 }

include/linux/nfs_xdr.h

@@ -538,10 +538,13 @@ typedef u64 clientid4;
 
 struct nfs4_accessargs {
 	const struct nfs_fh *		fh;
+	const u32 *			bitmask;
 	u32				access;
 };
 
 struct nfs4_accessres {
+	const struct nfs_server *	server;
+	struct nfs_fattr *		fattr;
 	u32				supported;
 	u32				access;
 };