[XFS] Remove some off_t abuse in pagebuf_offset and the page_io routine,

after some careful analysis.

SGI Modid: 2.5.x-xfs:slinx:140039a

fs/xfs/pagebuf/page_buf.c

@@ -1460,7 +1460,7 @@ pagebuf_mapout_locked(
 caddr_t
 pagebuf_offset(
 	page_buf_t		*pb,
-	off_t			offset)
+	size_t			offset)
 {
 	struct page		*page;
 

fs/xfs/pagebuf/page_buf.h

@@ -329,7 +329,7 @@ extern int pagebuf_iorequest(		/* start real I/O		*/
 extern int pagebuf_iowait(		/* wait for buffer I/O done	*/
 		page_buf_t *);		/* buffer to wait on		*/
 
-extern caddr_t	pagebuf_offset(page_buf_t *, off_t);
+extern caddr_t	pagebuf_offset(page_buf_t *, size_t);
 
 extern void pagebuf_iomove(		/* move data in/out of pagebuf	*/
 		page_buf_t *,		/* buffer to manipulate		*/

fs/xfs/xfs_buf.h

@@ -153,7 +153,7 @@ typedef struct pb_target xfs_buftarg_t;
 
 #define XFS_BUF_PTR(bp)		(xfs_caddr_t)((bp)->pb_addr)
 
-extern inline xfs_caddr_t xfs_buf_offset(page_buf_t *bp, off_t offset)
+extern inline xfs_caddr_t xfs_buf_offset(page_buf_t *bp, size_t offset)
 {
 	if (bp->pb_flags & PBF_MAPPED)
 		return XFS_BUF_PTR(bp) + offset;