I'm waiting the feedback from Kurt for this one, but at least it looks saner
than the previous version ;)

diff -urN ref/fs/nfs/file.c nfs-corruption/fs/nfs/file.c
--- ref/fs/nfs/file.c	Thu Feb 22 03:45:10 2001
+++ nfs-corruption/fs/nfs/file.c	Tue May  8 19:11:57 2001
@@ -39,6 +39,7 @@
 static ssize_t nfs_file_write(struct file *, const char *, size_t, loff_t *);
 static int  nfs_file_flush(struct file *);
 static int  nfs_fsync(struct file *, struct dentry *dentry, int datasync);
+static void nfs_file_close_vma(struct vm_area_struct *);
 
 struct file_operations nfs_file_operations = {
 	read:		nfs_file_read,
@@ -57,6 +58,11 @@
 	setattr:	nfs_notify_change,
 };
 
+static struct vm_operations_struct nfs_file_vm_ops = {
+	nopage:		filemap_nopage,
+	close:		nfs_file_close_vma,
+};
+
 /* Hack for future NFS swap support */
 #ifndef IS_SWAPFILE
 # define IS_SWAPFILE(inode)	(0)
@@ -104,6 +110,20 @@
 	return result;
 }
 
+static void nfs_file_close_vma(struct vm_area_struct * vma)
+{
+	struct inode * inode;
+
+	inode = vma->vm_file->f_dentry->d_inode;
+
+	if (inode->i_state & I_DIRTY_PAGES) {
+		filemap_fdatasync(inode->i_mapping);
+		lock_kernel();
+		nfs_wb_file(inode, vma->vm_file);
+		unlock_kernel();
+	}
+}
+
 static int
 nfs_file_mmap(struct file * file, struct vm_area_struct * vma)
 {
@@ -115,8 +135,11 @@
 		dentry->d_parent->d_name.name, dentry->d_name.name);
 
 	status = nfs_revalidate_inode(NFS_SERVER(inode), inode);
-	if (!status)
+	if (!status) {
 		status = generic_file_mmap(file, vma);
+		if (!status)
+			vma->vm_ops = &nfs_file_vm_ops;
+	}
 	return status;
 }