int extent_readpages(struct extent_io_tree *tree,
                     struct address_space *mapping,
-                    struct list_head *pages, unsigned nr_pages,
-                    get_extent_t get_extent)
+                    struct list_head *pages, unsigned nr_pages)
 {
        struct bio *bio = NULL;
        unsigned page_idx;
                pagepool[nr++] = page;
                if (nr < ARRAY_SIZE(pagepool))
                        continue;
-               __extent_readpages(tree, pagepool, nr, get_extent, &em_cached,
-                                  &bio, &bio_flags, &prev_em_start);
+               __extent_readpages(tree, pagepool, nr, btrfs_get_extent,
+                               &em_cached, &bio, &bio_flags, &prev_em_start);
                nr = 0;
        }
        if (nr)
-               __extent_readpages(tree, pagepool, nr, get_extent, &em_cached,
-                                  &bio, &bio_flags, &prev_em_start);
+               __extent_readpages(tree, pagepool, nr, btrfs_get_extent,
+                               &em_cached, &bio, &bio_flags, &prev_em_start);
 
        if (em_cached)
                free_extent_map(em_cached);
 
                            struct writeback_control *wbc);
 int extent_readpages(struct extent_io_tree *tree,
                     struct address_space *mapping,
-                    struct list_head *pages, unsigned nr_pages,
-                    get_extent_t get_extent);
+                    struct list_head *pages, unsigned nr_pages);
 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
                __u64 start, __u64 len);
 void set_page_extent_mapped(struct page *page);
 
 {
        struct extent_io_tree *tree;
        tree = &BTRFS_I(mapping->host)->io_tree;
-       return extent_readpages(tree, mapping, pages, nr_pages,
-                               btrfs_get_extent);
+       return extent_readpages(tree, mapping, pages, nr_pages);
 }
 static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags)
 {