NFS: Another cleanup of the read/write request coalescing code

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/include/linux/nfs_page.h b/include/linux/nfs_page.h
index 3ef8e04..91c7b18 100644
--- a/include/linux/nfs_page.h
+++ b/include/linux/nfs_page.h
@@ -50,9 +50,15 @@
 
 struct nfs_pageio_descriptor {
 	struct list_head	pg_list;
+	unsigned long		pg_bytes_written;
 	size_t			pg_count;
 	size_t			pg_bsize;
 	unsigned int		pg_base;
+
+	struct inode		*pg_inode;
+	int			(*pg_doio)(struct inode *, struct list_head *, size_t, int);
+	int 			pg_ioflags;
+	int			pg_error;
 };
 
 #define NFS_WBACK_BUSY(req)	(test_bit(PG_BUSY,&(req)->wb_flags))
@@ -71,10 +77,14 @@
 				struct list_head *dst);
 extern	int nfs_scan_list(struct nfs_inode *nfsi, struct list_head *head, struct list_head *dst,
 			  unsigned long idx_start, unsigned int npages);
-extern  void nfs_pageio_init(struct nfs_pageio_descriptor *desc,
-			     size_t iosize);
+extern	void nfs_pageio_init(struct nfs_pageio_descriptor *desc,
+			     struct inode *inode,
+			     int (*doio)(struct inode *, struct list_head *, size_t, int),
+			     size_t bsize,
+			     int how);
 extern	void nfs_pageio_add_list(struct nfs_pageio_descriptor *,
 				 struct list_head *);
+extern	void nfs_pageio_complete(struct nfs_pageio_descriptor *desc);
 extern  int nfs_wait_on_request(struct nfs_page *);
 extern	void nfs_unlock_request(struct nfs_page *req);
 extern  int nfs_set_page_writeback_locked(struct nfs_page *req);