+static int submit_extent_page(int rw, struct extent_map_tree *tree,
+ struct page *page, sector_t sector,
+ size_t size, unsigned long offset,
+ struct block_device *bdev,
+ struct bio **bio_ret,
+ int max_pages,
+ bio_end_io_t end_io_func)
+{
+ int ret = 0;
+ struct bio *bio;
+ int nr;
+
+ if (bio_ret && *bio_ret) {
+ bio = *bio_ret;
+ if (bio->bi_sector + (bio->bi_size >> 9) != sector ||
+ bio_add_page(bio, page, size, offset) < size) {
+ ret = submit_one_bio(rw, bio);
+ bio = NULL;
+ } else {
+ return 0;
+ }
+ }
+ nr = min(max_pages, bio_get_nr_vecs(bdev));
+ bio = extent_bio_alloc(bdev, sector, nr, GFP_NOFS | __GFP_HIGH);
+ if (!bio) {
+ printk("failed to allocate bio nr %d\n", nr);
+ }
+ bio_add_page(bio, page, size, offset);
+ bio->bi_end_io = end_io_func;
+ bio->bi_private = tree;
+ if (bio_ret) {
+ *bio_ret = bio;
+ } else {
+ ret = submit_one_bio(rw, bio);
+ }
+
+ return ret;
+}
+