There's only one caller.
Signed-off-by: David Sterba <dsterba@suse.com>
 }
 
 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
-                         get_extent_t *get_extent,
                          struct writeback_control *wbc)
 {
        int ret;
        struct extent_page_data epd = {
                .bio = NULL,
                .tree = tree,
-               .get_extent = get_extent,
+               .get_extent = btrfs_get_extent,
                .extent_locked = 0,
                .sync_io = wbc->sync_mode == WB_SYNC_ALL,
        };
 
 int extent_invalidatepage(struct extent_io_tree *tree,
                          struct page *page, unsigned long offset);
 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
-                         get_extent_t *get_extent,
                          struct writeback_control *wbc);
 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
                              u64 start, u64 end, int mode);
 
                return AOP_WRITEPAGE_ACTIVATE;
        }
        tree = &BTRFS_I(page->mapping->host)->io_tree;
-       ret = extent_write_full_page(tree, page, btrfs_get_extent, wbc);
+       ret = extent_write_full_page(tree, page, wbc);
        btrfs_add_delayed_iput(inode);
        return ret;
 }