803 	struct extent_map *split;  in btrfs_drop_extent_map_range()  local
829 	split = alloc_extent_map();  in btrfs_drop_extent_map_range()
877 			if (!split) {  in btrfs_drop_extent_map_range()
878 				split = split2;  in btrfs_drop_extent_map_range()
880 				if (!split)  in btrfs_drop_extent_map_range()
883 			split->start = em->start;  in btrfs_drop_extent_map_range()
884 			split->len = start - em->start;  in btrfs_drop_extent_map_range()
887 				split->disk_bytenr = em->disk_bytenr;  in btrfs_drop_extent_map_range()
888 				split->disk_num_bytes = em->disk_num_bytes;  in btrfs_drop_extent_map_range()
889 				split->offset = em->offset;  in btrfs_drop_extent_map_range()
890 				split->ram_bytes = em->ram_bytes;  in btrfs_drop_extent_map_range()
892 				split->disk_bytenr = em->disk_bytenr;  in btrfs_drop_extent_map_range()
893 				split->disk_num_bytes = 0;  in btrfs_drop_extent_map_range()
894 				split->offset = 0;  in btrfs_drop_extent_map_range()
895 				split->ram_bytes = split->len;  in btrfs_drop_extent_map_range()
898 			split->generation = gen;  in btrfs_drop_extent_map_range()
899 			split->flags = flags;  in btrfs_drop_extent_map_range()
900 			replace_extent_mapping(inode, em, split, modified);  in btrfs_drop_extent_map_range()
901 			free_extent_map(split);  in btrfs_drop_extent_map_range()
902 			split = split2;  in btrfs_drop_extent_map_range()
906 			if (!split) {  in btrfs_drop_extent_map_range()
907 				split = split2;  in btrfs_drop_extent_map_range()
909 				if (!split)  in btrfs_drop_extent_map_range()
912 			split->start = end;  in btrfs_drop_extent_map_range()
913 			split->len = em_end - end;  in btrfs_drop_extent_map_range()
914 			split->disk_bytenr = em->disk_bytenr;  in btrfs_drop_extent_map_range()
915 			split->flags = flags;  in btrfs_drop_extent_map_range()
916 			split->generation = gen;  in btrfs_drop_extent_map_range()
919 				split->disk_num_bytes = em->disk_num_bytes;  in btrfs_drop_extent_map_range()
920 				split->offset = em->offset + end - em->start;  in btrfs_drop_extent_map_range()
921 				split->ram_bytes = em->ram_bytes;  in btrfs_drop_extent_map_range()
923 				split->disk_num_bytes = 0;  in btrfs_drop_extent_map_range()
924 				split->offset = 0;  in btrfs_drop_extent_map_range()
925 				split->ram_bytes = split->len;  in btrfs_drop_extent_map_range()
929 				replace_extent_mapping(inode, em, split, modified);  in btrfs_drop_extent_map_range()
933 				ret = add_extent_mapping(inode, split, modified);  in btrfs_drop_extent_map_range()
939 			free_extent_map(split);  in btrfs_drop_extent_map_range()
940 			split = NULL;  in btrfs_drop_extent_map_range()
965 				ASSERT(!split);  in btrfs_drop_extent_map_range()
985 	free_extent_map(split);  in btrfs_drop_extent_map_range()