436 	struct extent_map *split = NULL;  in btrfs_drop_extent_cache()  local
451 		if (!split)  in btrfs_drop_extent_cache()
452 			split = alloc_extent_map();  in btrfs_drop_extent_cache()
455 		BUG_ON(!split || !split2); /* -ENOMEM */  in btrfs_drop_extent_cache()
483 			split->start = em->start;  in btrfs_drop_extent_cache()
484 			split->len = start - em->start;  in btrfs_drop_extent_cache()
485 			split->orig_start = em->orig_start;  in btrfs_drop_extent_cache()
486 			split->block_start = em->block_start;  in btrfs_drop_extent_cache()
489 				split->block_len = em->block_len;  in btrfs_drop_extent_cache()
491 				split->block_len = split->len;  in btrfs_drop_extent_cache()
493 			split->bdev = em->bdev;  in btrfs_drop_extent_cache()
494 			split->flags = flags;  in btrfs_drop_extent_cache()
495 			split->compress_type = em->compress_type;  in btrfs_drop_extent_cache()
496 			ret = add_extent_mapping(em_tree, split);  in btrfs_drop_extent_cache()
498 			free_extent_map(split);  in btrfs_drop_extent_cache()
499 			split = split2;  in btrfs_drop_extent_cache()
506 			split->start = start + len;  in btrfs_drop_extent_cache()
507 			split->len = em->start + em->len - (start + len);  in btrfs_drop_extent_cache()
508 			split->bdev = em->bdev;  in btrfs_drop_extent_cache()
509 			split->flags = flags;  in btrfs_drop_extent_cache()
510 			split->compress_type = em->compress_type;  in btrfs_drop_extent_cache()
513 				split->block_len = em->block_len;  in btrfs_drop_extent_cache()
514 				split->block_start = em->block_start;  in btrfs_drop_extent_cache()
515 				split->orig_start = em->orig_start;  in btrfs_drop_extent_cache()
517 				split->block_len = split->len;  in btrfs_drop_extent_cache()
518 				split->block_start = em->block_start + diff;  in btrfs_drop_extent_cache()
519 				split->orig_start = split->start;  in btrfs_drop_extent_cache()
522 			ret = add_extent_mapping(em_tree, split);  in btrfs_drop_extent_cache()
524 			free_extent_map(split);  in btrfs_drop_extent_cache()
525 			split = NULL;  in btrfs_drop_extent_cache()
534 	if (split)  in btrfs_drop_extent_cache()
535 		free_extent_map(split);  in btrfs_drop_extent_cache()
859 	u64 split;  in btrfs_mark_extent_written()  local
873 	split = start;  in btrfs_mark_extent_written()
876 	key.offset = split;  in btrfs_mark_extent_written()
949 			split = end;  in btrfs_mark_extent_written()
951 		new_key.offset = split;  in btrfs_mark_extent_written()
966 						split - key.offset);  in btrfs_mark_extent_written()
971 		btrfs_set_file_extent_offset(leaf, fi, split - orig_offset);  in btrfs_mark_extent_written()
973 						extent_end - split);  in btrfs_mark_extent_written()
981 		if (split == start) {  in btrfs_mark_extent_written()