diff -ur linux-source-2.6.15-28.57/fs/nfs/file.c linux-source-2.6.15-28.57.1/fs/nfs/file.c
--- linux-source-2.6.15-28.57/fs/nfs/file.c	2006-03-03 06:18:38.000000000 +0900
+++ linux-source-2.6.15-28.57.1/fs/nfs/file.c	2007-08-08 17:58:00.000000000 +0900
@@ -316,6 +316,18 @@
 	return status;
 }
 
+static int nfs_invalidate_page(struct page *page, unsigned long offset)
+{
+	BUG_ON(PagePrivate(page));
+	return 1;
+}
+
+static int nfs_release_page(struct page *page, gfp_t gfp)
+{
+	ClearPageUptodate(page);
+	return 0;
+}
+
 struct address_space_operations nfs_file_aops = {
 	.readpage = nfs_readpage,
 	.readpages = nfs_readpages,
@@ -324,6 +336,8 @@
 	.writepages = nfs_writepages,
 	.prepare_write = nfs_prepare_write,
 	.commit_write = nfs_commit_write,
+	.invalidatepage = nfs_invalidate_page,
+	.releasepage = nfs_release_page,
 #ifdef CONFIG_NFS_DIRECTIO
 	.direct_IO = nfs_direct_IO,
 #endif
diff -ur linux-source-2.6.15-28.57/fs/nfs/pagelist.c linux-source-2.6.15-28.57.1/fs/nfs/pagelist.c
--- linux-source-2.6.15-28.57/fs/nfs/pagelist.c	2006-03-03 06:18:38.000000000 +0900
+++ linux-source-2.6.15-28.57.1/fs/nfs/pagelist.c	2007-08-08 17:59:59.000000000 +0900
@@ -85,6 +85,7 @@
 	atomic_set(&req->wb_complete, 0);
 	req->wb_index	= page->index;
 	page_cache_get(page);
+	SetPagePrivate(page);
 	req->wb_offset  = offset;
 	req->wb_pgbase	= offset;
 	req->wb_bytes   = count;
@@ -147,8 +148,10 @@
  */
 void nfs_clear_request(struct nfs_page *req)
 {
-	if (req->wb_page) {
-		page_cache_release(req->wb_page);
+	struct page *page = req->wb_page;
+	if (page != NULL) {
+		ClearPagePrivate(page);
+		page_cache_release(page);
 		req->wb_page = NULL;
 	}
 }