--- linux-2.6.30.i686/fs/nfs/file.c.org
+++ linux-2.6.30.i686/fs/nfs/file.c
@@ -337,15 +337,15 @@ static int nfs_write_begin(struct file *
 			struct page **pagep, void **fsdata)
 {
 	int ret;
-	pgoff_t index;
+	pgoff_t index = pos >> PAGE_CACHE_SHIFT;
 	struct page *page;
-	index = pos >> PAGE_CACHE_SHIFT;
 
 	dfprintk(PAGECACHE, "NFS: write_begin(%s/%s(%ld), %u@%lld)\n",
 		file->f_path.dentry->d_parent->d_name.name,
 		file->f_path.dentry->d_name.name,
 		mapping->host->i_ino, len, (long long) pos);
 
+start:
 	/*
 	 * Prevent starvation issues if someone is doing a consistency
 	 * sync-to-disk
@@ -364,6 +364,12 @@ static int nfs_write_begin(struct file *
 	if (ret) {
 		unlock_page(page);
 		page_cache_release(page);
+	} else if ((file->f_mode & FMODE_READ) && !PageUptodate(page) &&
+		   ((pos & (PAGE_CACHE_SIZE - 1)) || len != PAGE_CACHE_SIZE)) {
+		ret = nfs_readpage(file, page);
+		page_cache_release(page);
+		if (!ret)
+			goto start;
 	}
 	return ret;
 }