2435  *  1) Merge trimmed areas together
2436  *  2) Let untrimmed areas coalesce with trimmed areas
2444  * space is trimmed, it will prevent aggregating trimmed new region and
2780  * it on loading of a block group, we want to consider it trimmed.
3056  * Walk @block_group's free space rb_tree to determine if everything is trimmed.
3662 	u64 trimmed = 0;  in do_trimming()  local
3674 	ret = btrfs_discard_extent(fs_info, start, bytes, &trimmed);  in do_trimming()
3676 		*total_trimmed += trimmed;  in do_trimming()
3738 		/* Skip bitmaps and if async, already trimmed entries */  in trim_no_bitmap()
3906 		 * Bitmaps are marked trimmed lossily now to prevent constant  in trim_bitmaps()
3934 			 * We lossily consider a bitmap trimmed if we only skip  in trim_bitmaps()
3948 		 * We already trimmed a region, but are using the locking above  in trim_bitmaps()
4020 			   u64 *trimmed, u64 start, u64 end, u64 minlen)  in btrfs_trim_block_group()  argument
4028 	*trimmed = 0;  in btrfs_trim_block_group()
4038 	ret = trim_no_bitmap(block_group, trimmed, start, end, minlen, false);  in btrfs_trim_block_group()
4042 	ret = trim_bitmaps(block_group, trimmed, start, end, minlen, 0, false);  in btrfs_trim_block_group()
4053 				   u64 *trimmed, u64 start, u64 end, u64 minlen,  in btrfs_trim_block_group_extents()  argument
4058 	*trimmed = 0;  in btrfs_trim_block_group_extents()
4068 	ret = trim_no_bitmap(block_group, trimmed, start, end, minlen, async);  in btrfs_trim_block_group_extents()
4075 				   u64 *trimmed, u64 start, u64 end, u64 minlen,  in btrfs_trim_block_group_bitmaps()  argument
4080 	*trimmed = 0;  in btrfs_trim_block_group_bitmaps()
4090 	ret = trim_bitmaps(block_group, trimmed, start, end, minlen, maxlen,  in btrfs_trim_block_group_bitmaps()