28  * o pbuf can wrap only at a block boundary
60 		 * 2. We cannot wrap except on a block boundary.  in pio_copy()
76 		 * If the wrap comes before or matches the data end,  in pio_copy()
77 		 * copy until until the wrap, then wrap.  in pio_copy()
81 		 * and nothing will get written, but we will wrap in  in pio_copy()
95 		/* write 8-byte non-SOP, non-wrap chunk data */  in pio_copy()
102 	/* at this point we have wrapped if we are going to wrap */  in pio_copy()
115 	 * as we only wrap on a block boundary  in pio_copy()
291 		 * 2. We cannot wrap except on a block boundary.  in seg_pio_copy_start()
307 		 * If the wrap comes before or matches the data end,  in seg_pio_copy_start()
308 		 * copy until until the wrap, then wrap.  in seg_pio_copy_start()
312 		 * and nothing will get written, but we will wrap in  in seg_pio_copy_start()
326 		/* write 8-byte non-SOP, non-wrap chunk data */  in seg_pio_copy_start()
333 	/* at this point we have wrapped if we are going to wrap */  in seg_pio_copy_start()
368 		 * wrap because we are still in the first block and  in mid_copy_mix()
369 		 * can only wrap on block boundaries.  in mid_copy_mix()
398 	 * - at the wrap  in mid_copy_mix()
402 	 * If the wrap comes before or matches the data end,  in mid_copy_mix()
403 	 * copy until until the wrap, then wrap.  in mid_copy_mix()
405 	 * If dest is at the wrap, we will fall into the if,  in mid_copy_mix()
406 	 * not do the loop, when wrap.  in mid_copy_mix()
423 	/* write 8-byte non-SOP, non-wrap chunk data */  in mid_copy_mix()
442 		 * Check for wrap and the possibility the write  in mid_copy_mix()
448 		 * we cannot have wrapped. We do the wrap check first as that  in mid_copy_mix()
494 		 * wrap because we are still in the first block and  in mid_copy_straight()
495 		 * can only wrap on block boundaries.  in mid_copy_straight()
524 	 * - at the wrap  in mid_copy_straight()
528 	 * If the wrap comes before or matches the data end,  in mid_copy_straight()
529 	 * copy until until the wrap, then wrap.  in mid_copy_straight()
531 	 * If dest is at the wrap, we will fall into the if,  in mid_copy_straight()
532 	 * not do the loop, when wrap.  in mid_copy_straight()
549 	/* write 8-byte non-SOP, non-wrap chunk data */  in mid_copy_straight()
622 			 * cannot have wrapped.  We do the wrap check first  in seg_pio_copy_mid()
675 	 * cannot have wrapped.  We do the wrap check first as that is  in seg_pio_copy_end()