705 	struct extent_map *split;  in btrfs_drop_extent_map_range()  local
731 	split = alloc_extent_map();  in btrfs_drop_extent_map_range()
779 			if (!split) {  in btrfs_drop_extent_map_range()
780 				split = split2;  in btrfs_drop_extent_map_range()
782 				if (!split)  in btrfs_drop_extent_map_range()
785 			split->start = em->start;  in btrfs_drop_extent_map_range()
786 			split->len = start - em->start;  in btrfs_drop_extent_map_range()
789 				split->orig_start = em->orig_start;  in btrfs_drop_extent_map_range()
790 				split->block_start = em->block_start;  in btrfs_drop_extent_map_range()
793 					split->block_len = em->block_len;  in btrfs_drop_extent_map_range()
795 					split->block_len = split->len;  in btrfs_drop_extent_map_range()
796 				split->orig_block_len = max(split->block_len,  in btrfs_drop_extent_map_range()
798 				split->ram_bytes = em->ram_bytes;  in btrfs_drop_extent_map_range()
800 				split->orig_start = split->start;  in btrfs_drop_extent_map_range()
801 				split->block_len = 0;  in btrfs_drop_extent_map_range()
802 				split->block_start = em->block_start;  in btrfs_drop_extent_map_range()
803 				split->orig_block_len = 0;  in btrfs_drop_extent_map_range()
804 				split->ram_bytes = split->len;  in btrfs_drop_extent_map_range()
807 			split->generation = gen;  in btrfs_drop_extent_map_range()
808 			split->flags = flags;  in btrfs_drop_extent_map_range()
809 			split->compress_type = em->compress_type;  in btrfs_drop_extent_map_range()
810 			replace_extent_mapping(em_tree, em, split, modified);  in btrfs_drop_extent_map_range()
811 			free_extent_map(split);  in btrfs_drop_extent_map_range()
812 			split = split2;  in btrfs_drop_extent_map_range()
816 			if (!split) {  in btrfs_drop_extent_map_range()
817 				split = split2;  in btrfs_drop_extent_map_range()
819 				if (!split)  in btrfs_drop_extent_map_range()
822 			split->start = start + len;  in btrfs_drop_extent_map_range()
823 			split->len = em_end - (start + len);  in btrfs_drop_extent_map_range()
824 			split->block_start = em->block_start;  in btrfs_drop_extent_map_range()
825 			split->flags = flags;  in btrfs_drop_extent_map_range()
826 			split->compress_type = em->compress_type;  in btrfs_drop_extent_map_range()
827 			split->generation = gen;  in btrfs_drop_extent_map_range()
830 				split->orig_block_len = max(em->block_len,  in btrfs_drop_extent_map_range()
833 				split->ram_bytes = em->ram_bytes;  in btrfs_drop_extent_map_range()
835 					split->block_len = em->block_len;  in btrfs_drop_extent_map_range()
836 					split->orig_start = em->orig_start;  in btrfs_drop_extent_map_range()
840 					split->block_len = split->len;  in btrfs_drop_extent_map_range()
841 					split->block_start += diff;  in btrfs_drop_extent_map_range()
842 					split->orig_start = em->orig_start;  in btrfs_drop_extent_map_range()
845 				split->ram_bytes = split->len;  in btrfs_drop_extent_map_range()
846 				split->orig_start = split->start;  in btrfs_drop_extent_map_range()
847 				split->block_len = 0;  in btrfs_drop_extent_map_range()
848 				split->orig_block_len = 0;  in btrfs_drop_extent_map_range()
852 				replace_extent_mapping(em_tree, em, split,  in btrfs_drop_extent_map_range()
857 				ret = add_extent_mapping(em_tree, split,  in btrfs_drop_extent_map_range()
864 			free_extent_map(split);  in btrfs_drop_extent_map_range()
865 			split = NULL;  in btrfs_drop_extent_map_range()
890 				ASSERT(!split);  in btrfs_drop_extent_map_range()
910 	free_extent_map(split);  in btrfs_drop_extent_map_range()