Use pgoff_t instead of unsigned long

Convert variables containing page indexes to pgoff_t.
Signed-off-by: NJan Kara <jack@suse.cz>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

mm/filemap.c

@@ -1332,7 +1332,7 @@ int filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 	struct file_ra_state *ra = &file->f_ra;
 	struct inode *inode = mapping->host;
 	struct page *page;
-	unsigned long size;
+	pgoff_t size;
 	int did_readaround = 0;
 	int ret = 0;
 

mm/filemap_xip.c

@@ -56,7 +56,8 @@ do_xip_mapping_read(struct address_space *mapping,
 		    read_actor_t actor)
 {
 	struct inode *inode = mapping->host;
-	unsigned long index, end_index, offset;
+	pgoff_t index, end_index;
+	unsigned long offset;
 	loff_t isize;
 
 	BUG_ON(!mapping->a_ops->get_xip_page);