40  *	constant defines the size of the bitmaps contained in a leaf node
49  *	For a leaf node, a bit is set if the corresponding block is free.  For a
155  * number of leaf nodes of the subtree is L=radix/BLIST_RADIX.  If 'm'
157  * leaf nodes, the total number of tree nodes is 1 + m + m**2 + ... + m**h,
201  *	The smallest blist consists of a single leaf node capable of
221 	 * Include a sentinel node to ensure that cross-leaf scans stay within  in blist_create()
538 			 * Scan leaf.  in blist_stats()
576  * BLST_NEXT_LEAF_ALLOC() - allocate the blocks starting with the next leaf.
578  *	'scan' is a leaf node, and its first block is at address 'start'.  The
579  *	next leaf node could be adjacent, or several nodes away if the least
602 			 * Either there is no next leaf with any free blocks,  in blst_next_leaf_alloc()
603 			 * or we've reached the next leaf and found that some  in blst_next_leaf_alloc()
610 				 * There isn't a next leaf with enough free  in blst_next_leaf_alloc()
619 				 * There was no next leaf.  Back scan up to  in blst_next_leaf_alloc()
620 				 * last leaf.  in blst_next_leaf_alloc()
632 	 * 'scan' is the last leaf that provides blocks.  Clear from 1 to  in blst_next_leaf_alloc()
655 		/* Clear all the bits of this leaf. */  in blst_next_leaf_alloc()
662  * BLST_LEAF_ALLOC() -	allocate at a leaf in the radix tree (a bitmap).
666  *	crosses a leaf boundary.
695 		 * count1 >> num_shifts starting in this leaf.  in blst_leaf_alloc()
739 		/* Check next leaf for some of the blocks we want or need. */  in blst_leaf_alloc()
745 			 * The next leaf cannot supply enough blocks to reach  in blst_leaf_alloc()
748 			 * be satisfied later, by this leaf, if the state of  in blst_leaf_alloc()
749 			 * the next leaf changes, and without any changes to  in blst_leaf_alloc()
750 			 * this leaf.  in blst_leaf_alloc()
757 	/* Clear the allocated bits from this leaf. */  in blst_leaf_alloc()
835  * BLST_LEAF_FREE() -	free allocated block from leaf bitmap
917 	 * Leaf node  in blst_copy()
960  * BLST_LEAF_FILL() -	allocate specific blocks in leaf bitmap