Prepare for the introduction of NFSv4 state code.

Split out the open() method for regular files from that of
directories.

fs/nfs/dir.c

@@ -35,6 +35,7 @@
 #define NFS_PARANOIA 1
 /* #define NFS_DEBUG_VERBOSE 1 */
 
+static int nfs_opendir(struct inode *, struct file *);
 static int nfs_readdir(struct file *, void *, filldir_t);
 static struct dentry *nfs_lookup(struct inode *, struct dentry *);
 static int nfs_cached_lookup(struct inode *, struct dentry *,
@@ -52,7 +53,7 @@ static int nfs_rename(struct inode *, struct dentry *,
 struct file_operations nfs_dir_operations = {
 	.read		= generic_read_dir,
 	.readdir	= nfs_readdir,
-	.open		= nfs_open,
+	.open		= nfs_opendir,
 	.release	= nfs_release,
 };
 
@@ -71,6 +72,26 @@ struct inode_operations nfs_dir_inode_operations = {
 	.setattr	= nfs_setattr,
 };
 
+/*
+ * Open file
+ */
+static int
+nfs_opendir(struct inode *inode, struct file *filp)
+{
+	struct nfs_server *server = NFS_SERVER(inode);
+	int res = 0;
+
+	lock_kernel();
+	/* Do cto revalidation */
+	if (server->flags & NFS_MOUNT_NOCTO)
+		res = __nfs_revalidate_inode(server, inode);
+	/* Call generic open code in order to cache credentials */
+	if (!res)
+		res = nfs_open(inode, filp);
+	unlock_kernel();
+	return res;
+}
+
 typedef u32 * (*decode_dirent_t)(u32 *, struct nfs_entry *, int);
 typedef struct {
 	struct file	*file;

fs/nfs/file.c

@@ -34,6 +34,7 @@
 
 #define NFSDBG_FACILITY		NFSDBG_FILE
 
+static int nfs_file_open(struct inode *, struct file *);
 static int  nfs_file_mmap(struct file *, struct vm_area_struct *);
 static ssize_t nfs_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void *);
 static ssize_t nfs_file_read(struct kiocb *, char *, size_t, loff_t);
@@ -48,7 +49,7 @@ struct file_operations nfs_file_operations = {
 	.aio_read		= nfs_file_read,
 	.aio_write		= nfs_file_write,
 	.mmap		= nfs_file_mmap,
-	.open		= nfs_open,
+	.open		= nfs_file_open,
 	.flush		= nfs_file_flush,
 	.release	= nfs_release,
 	.fsync		= nfs_fsync,
@@ -67,6 +68,30 @@ struct inode_operations nfs_file_inode_operations = {
 # define IS_SWAPFILE(inode)	(0)
 #endif
 
+/*
+ * Open file
+ */
+static int
+nfs_file_open(struct inode *inode, struct file *filp)
+{
+	struct nfs_server *server = NFS_SERVER(inode);
+	int (*open)(struct inode *, struct file *);
+	int res = 0;
+
+	lock_kernel();
+	/* Do NFSv4 open() call */
+	if ((open = server->rpc_ops->file_open) != NULL)
+		res = open(inode, filp);
+	/* Do cto revalidation */
+	else if (server->flags & NFS_MOUNT_NOCTO)
+		res = __nfs_revalidate_inode(server, inode);
+	/* Call generic open code in order to cache credentials */
+	if (!res)
+		res = nfs_open(inode, filp);
+	unlock_kernel();
+	return res;
+}
+
 /*
  * Flush all dirty pages, and check for write errors.
  *

fs/nfs/inode.c

@@ -855,23 +855,13 @@ int nfs_open(struct inode *inode, struct file *filp)
 {
 	struct rpc_auth *auth;
 	struct rpc_cred *cred;
-	int err = 0;
 
-	lock_kernel();
-	/* Ensure that we revalidate the data cache */
-	if (NFS_SERVER(inode)->flags & NFS_MOUNT_NOCTO) {
-		err = __nfs_revalidate_inode(NFS_SERVER(inode),inode);
-		if (err)
-			goto out;
-	}
 	auth = NFS_CLIENT(inode)->cl_auth;
 	cred = rpcauth_lookupcred(auth, 0);
 	filp->private_data = cred;
 	if (filp->f_mode & FMODE_WRITE)
 		nfs_set_mmcred(inode, cred);
-out:
-	unlock_kernel();
-	return err;
+	return 0;
 }
 
 int nfs_release(struct inode *inode, struct file *filp)

fs/nfs/nfs4proc.c

@@ -1560,6 +1560,16 @@ nfs4_proc_renew(struct nfs_server *server)
 	return rpc_execute(task);
 }
 
+/*
+* To be changed into a real NFSv4 file_open soon. 
+*/
+
+int
+nfs4_proc_file_open(struct inode *inode, struct file *filp)
+{
+	return 0;
+}
+
 struct nfs_rpc_ops	nfs_v4_clientops = {
 	.version	= 4,			/* protocol version */
 	.getroot	= nfs4_proc_get_root,
@@ -1589,6 +1599,7 @@ struct nfs_rpc_ops	nfs_v4_clientops = {
 	.read_setup	= nfs4_proc_read_setup,
 	.write_setup	= nfs4_proc_write_setup,
 	.commit_setup	= nfs4_proc_commit_setup,
+	.file_open      = nfs4_proc_file_open,
 };
 
 /*

include/linux/nfs_xdr.h

@@ -597,6 +597,7 @@ struct nfs_rpc_ops {
 	void	(*read_setup)   (struct nfs_read_data *, unsigned int count);
 	void	(*write_setup)  (struct nfs_write_data *, unsigned int count, int how);
 	void	(*commit_setup) (struct nfs_write_data *, u64 start, u32 len, int how);
+	int	(*file_open)   (struct inode *, struct file *);
 };
 
 /*