fs/btrfs/discard.c

35  * being added to the unused_bgs list, we add it to this first list.  Then
36  * from there, if it becomes fully discarded, we place it onto the unused_bgs
455  * unused and send it to the unused_bgs path.  Otherwise, pass it onto the
480  * bitmaps.  Completely discarded block groups are sent to the unused_bgs path.
670  * Punt unused_bgs list to discard lists.
674  * The unused_bgs list needs to be punted to the discard lists because the
678  * it must be done before going down the unused_bgs path.
686 	list_for_each_entry_safe(block_group, next, &fs_info->unused_bgs,
705  * are completely free and ready for the unused_bgs path.  As discarding will
708  * way to the unused_bgs list.