93 	/* This blocks if we are low on resources */  in extAlloc()
116 		 * extent if we can allocate the blocks immediately  in extAlloc()
127 	/* allocate the disk blocks for the extent.  initially, extBalloc()  in extAlloc()
128 	 * will try to allocate disk blocks for the requested size (xlen).  in extAlloc()
129 	 * if this fails (xlen contiguous free blocks not available), it'll  in extAlloc()
130 	 * try to allocate a smaller number of blocks (producing a smaller  in extAlloc()
131 	 * extent), with this smaller number of blocks consisting of the  in extAlloc()
132 	 * requested number of blocks rounded down to the next smaller  in extAlloc()
134 	 * and retry the allocation until the number of blocks to allocate  in extAlloc()
135 	 * is smaller than the number of blocks per page.  in extAlloc()
143 	/* Allocate blocks to quota. */  in extAlloc()
164 	 * free the newly allocated blocks and return the error.  in extAlloc()
223 	/* This blocks if we are low on resources */  in extRealloc()
232 	 * number of blocks.  in extRealloc()
248 	/* try to allocated the request number of blocks for the  in extRealloc()
251 	 * try to allocate a new set of blocks large enough for the  in extRealloc()
259 	/* Allocat blocks to quota. */  in extRealloc()
321 		/* perform the insert.  if it fails, free the blocks  in extRealloc()
480  * FUNCTION:	allocate disk blocks to form an extent.
482  *		initially, we will try to allocate disk blocks for the
484  *		contiguous free blocks not available), we'll try to allocate
485  *		a smaller number of blocks (producing a smaller extent), with
486  *		this smaller number of blocks consisting of the requested
487  *		number of blocks rounded down to the next smaller power of 2
489  *		retry the allocation until the number of blocks to allocate
490  *		is smaller than the number of blocks per page.
497  *		   exit, this value is set to the number of blocks actually
518 	/* get the number of blocks to initially attempt to allocate.  in extBalloc()
519 	 * we'll first try the number of blocks requested unless this  in extBalloc()
521 	 * blocks in the map. in that case, we'll start off with the  in extBalloc()
530 	/* try to allocate blocks */  in extBalloc()
575  *		to a new set of blocks.  If moving the extent, we initially
576  *		will try to allocate disk blocks for the requested size
577  *		(newnblks).  if this fails (new contiguous free blocks not
579  *		blocks (producing a smaller extent), with this smaller
580  *		number of blocks consisting of the requested number of
581  *		blocks rounded down to the next smaller power of 2
583  *		retry the allocation until the number of blocks to allocate
584  *		is smaller than the number of blocks per page.
589  *	nblks	 - number of blocks within the extents current allocation.
591  *		   the new desired extent size (number of blocks).  on
593  *		   new size (new number of blocks).
617 	 * try to move the extent to a new set of blocks.  in extBrealloc()
627  * FUNCTION:	round down a specified number of blocks to the next