217 	if (idx == sh->pd_idx)  in raid6_idx_to_slot()
809 	while (dd_idx == sh->pd_idx || dd_idx == sh->qd_idx)  in stripe_add_to_batch_list()
1356 		if (i == sh->qd_idx || i == sh->pd_idx ||  in set_syndrome_sources()
1549 	int count = 0, pd_idx = sh->pd_idx, i;  in ops_run_prexor5()  local
1553 	struct page *xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page;  in ops_run_prexor5()
1660 	int pd_idx = sh->pd_idx;  in ops_complete_reconstruct()  local
1677 		if (dev->written || i == pd_idx || i == qd_idx) {  in ops_complete_reconstruct()
1707 	int count, pd_idx = sh->pd_idx, i;  in ops_run_reconstruct5()  local
1719 		if (pd_idx == i)  in ops_run_reconstruct5()
1726 		set_bit(R5_Discard, &sh->dev[pd_idx].flags);  in ops_run_reconstruct5()
1738 		xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page;  in ops_run_reconstruct5()
1745 		xor_dest = sh->dev[pd_idx].page;  in ops_run_reconstruct5()
1748 			if (i != pd_idx)  in ops_run_reconstruct5()
1801 		if (sh->pd_idx == i || sh->qd_idx == i)  in ops_run_reconstruct6()
1808 		set_bit(R5_Discard, &sh->dev[sh->pd_idx].flags);  in ops_run_reconstruct6()
1861 	int pd_idx = sh->pd_idx;  in ops_run_check_p()  local
1875 	xor_dest = sh->dev[pd_idx].page;  in ops_run_check_p()
1878 		if (i == pd_idx || i == qd_idx)  in ops_run_check_p()
2541 	int pd_idx, qd_idx;  in raid5_compute_sector()  local
2569 	pd_idx = qd_idx = -1;  in raid5_compute_sector()
2572 		pd_idx = data_disks;  in raid5_compute_sector()
2577 			pd_idx = data_disks - sector_div(stripe2, raid_disks);  in raid5_compute_sector()
2578 			if (*dd_idx >= pd_idx)  in raid5_compute_sector()
2582 			pd_idx = sector_div(stripe2, raid_disks);  in raid5_compute_sector()
2583 			if (*dd_idx >= pd_idx)  in raid5_compute_sector()
2587 			pd_idx = data_disks - sector_div(stripe2, raid_disks);  in raid5_compute_sector()
2588 			*dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks;  in raid5_compute_sector()
2591 			pd_idx = sector_div(stripe2, raid_disks);  in raid5_compute_sector()
2592 			*dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks;  in raid5_compute_sector()
2595 			pd_idx = 0;  in raid5_compute_sector()
2599 			pd_idx = data_disks;  in raid5_compute_sector()
2609 			pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks);  in raid5_compute_sector()
2610 			qd_idx = pd_idx + 1;  in raid5_compute_sector()
2611 			if (pd_idx == raid_disks-1) {  in raid5_compute_sector()
2614 			} else if (*dd_idx >= pd_idx)  in raid5_compute_sector()
2618 			pd_idx = sector_div(stripe2, raid_disks);  in raid5_compute_sector()
2619 			qd_idx = pd_idx + 1;  in raid5_compute_sector()
2620 			if (pd_idx == raid_disks-1) {  in raid5_compute_sector()
2623 			} else if (*dd_idx >= pd_idx)  in raid5_compute_sector()
2627 			pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks);  in raid5_compute_sector()
2628 			qd_idx = (pd_idx + 1) % raid_disks;  in raid5_compute_sector()
2629 			*dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks;  in raid5_compute_sector()
2632 			pd_idx = sector_div(stripe2, raid_disks);  in raid5_compute_sector()
2633 			qd_idx = (pd_idx + 1) % raid_disks;  in raid5_compute_sector()
2634 			*dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks;  in raid5_compute_sector()
2638 			pd_idx = 0;  in raid5_compute_sector()
2643 			pd_idx = data_disks;  in raid5_compute_sector()
2651 			pd_idx = sector_div(stripe2, raid_disks);  in raid5_compute_sector()
2652 			qd_idx = pd_idx + 1;  in raid5_compute_sector()
2653 			if (pd_idx == raid_disks-1) {  in raid5_compute_sector()
2656 			} else if (*dd_idx >= pd_idx)  in raid5_compute_sector()
2667 			pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks);  in raid5_compute_sector()
2668 			qd_idx = pd_idx + 1;  in raid5_compute_sector()
2669 			if (pd_idx == raid_disks-1) {  in raid5_compute_sector()
2672 			} else if (*dd_idx >= pd_idx)  in raid5_compute_sector()
2679 			pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks);  in raid5_compute_sector()
2680 			qd_idx = (pd_idx + raid_disks - 1) % raid_disks;  in raid5_compute_sector()
2681 			*dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks;  in raid5_compute_sector()
2687 			pd_idx = data_disks - sector_div(stripe2, raid_disks-1);  in raid5_compute_sector()
2688 			if (*dd_idx >= pd_idx)  in raid5_compute_sector()
2694 			pd_idx = sector_div(stripe2, raid_disks-1);  in raid5_compute_sector()
2695 			if (*dd_idx >= pd_idx)  in raid5_compute_sector()
2701 			pd_idx = data_disks - sector_div(stripe2, raid_disks-1);  in raid5_compute_sector()
2702 			*dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1);  in raid5_compute_sector()
2707 			pd_idx = sector_div(stripe2, raid_disks-1);  in raid5_compute_sector()
2708 			*dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1);  in raid5_compute_sector()
2713 			pd_idx = 0;  in raid5_compute_sector()
2725 		sh->pd_idx = pd_idx;  in raid5_compute_sector()
2756 	if (i == sh->pd_idx)  in raid5_compute_blocknr()
2764 			if (i > sh->pd_idx)  in raid5_compute_blocknr()
2769 			if (i < sh->pd_idx)  in raid5_compute_blocknr()
2771 			i -= (sh->pd_idx + 1);  in raid5_compute_blocknr()
2790 			if (sh->pd_idx == raid_disks-1)  in raid5_compute_blocknr()
2792 			else if (i > sh->pd_idx)  in raid5_compute_blocknr()
2797 			if (sh->pd_idx == raid_disks-1)  in raid5_compute_blocknr()
2801 				if (i < sh->pd_idx)  in raid5_compute_blocknr()
2803 				i -= (sh->pd_idx + 2);  in raid5_compute_blocknr()
2813 			if (sh->pd_idx == 0)  in raid5_compute_blocknr()
2817 				if (i < sh->pd_idx)  in raid5_compute_blocknr()
2819 				i -= (sh->pd_idx + 1);  in raid5_compute_blocknr()
2824 			if (i > sh->pd_idx)  in raid5_compute_blocknr()
2829 			if (i < sh->pd_idx)  in raid5_compute_blocknr()
2831 			i -= (sh->pd_idx + 1);  in raid5_compute_blocknr()
2847 	if (check != sh->sector || dummy1 != dd_idx || sh2.pd_idx != sh->pd_idx  in raid5_compute_blocknr()
2860 	int i, pd_idx = sh->pd_idx, qd_idx = sh->qd_idx, disks = sh->disks;  in schedule_reconstruction()  local
2896 		BUG_ON(!(test_bit(R5_UPTODATE, &sh->dev[pd_idx].flags) ||  in schedule_reconstruction()
2897 			test_bit(R5_Wantcompute, &sh->dev[pd_idx].flags)));  in schedule_reconstruction()
2904 			if (i == pd_idx || i == qd_idx)  in schedule_reconstruction()
2928 	set_bit(R5_LOCKED, &sh->dev[pd_idx].flags);  in schedule_reconstruction()
2929 	clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags);  in schedule_reconstruction()
3200 	if (test_and_clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags))  in handle_failed_sync()
3341 		if (s->failed_num[i] != sh->pd_idx &&  in need_this_block()
3514 	    test_bit(R5_Discard, &sh->dev[sh->pd_idx].flags)) {  in handle_stripe_clean_event()
3516 		clear_bit(R5_Discard, &sh->dev[sh->pd_idx].flags);  in handle_stripe_clean_event()
3517 		clear_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags);  in handle_stripe_clean_event()
3583 		if ((dev->towrite || i == sh->pd_idx || i == sh->qd_idx) &&  in handle_stripe_dirtying()
3594 		    i != sh->pd_idx && i != sh->qd_idx &&  in handle_stripe_dirtying()
3615 			if ((dev->towrite || i == sh->pd_idx || i == sh->qd_idx) &&  in handle_stripe_dirtying()
3641 			    i != sh->pd_idx && i != sh->qd_idx &&  in handle_stripe_dirtying()
3702 			clear_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags);  in handle_parity_checks5()
3711 			dev = &sh->dev[sh->pd_idx];  in handle_parity_checks5()
3758 					&sh->dev[sh->pd_idx].flags);  in handle_parity_checks5()
3759 				sh->ops.target = sh->pd_idx;  in handle_parity_checks5()
3779 	int pd_idx = sh->pd_idx;  in handle_parity_checks6()  local
3819 			clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags);  in handle_parity_checks6()
3858 			dev = &sh->dev[pd_idx];  in handle_parity_checks6()
3915 						&sh->dev[pd_idx].flags);  in handle_parity_checks6()
3916 					*target = pd_idx;  in handle_parity_checks6()
3950 		if (i != sh->pd_idx && i != sh->qd_idx) {  in handle_stripe_expansion()
3981 				if (j != sh2->pd_idx &&  in handle_stripe_expansion()
4332 	       atomic_read(&sh->count), sh->pd_idx, sh->qd_idx,  in handle_stripe()
4391 		BUG_ON(!test_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags) &&  in handle_stripe()
4392 		       !test_bit(R5_Discard, &sh->dev[sh->pd_idx].flags));  in handle_stripe()
4399 				(i == sh->pd_idx || i == sh->qd_idx ||  in handle_stripe()
4408 				    ((i == sh->pd_idx || i == sh->qd_idx)  &&  in handle_stripe()
4421 	pdev = &sh->dev[sh->pd_idx];  in handle_stripe()
4422 	s.p_failed = (s.failed >= 1 && s.failed_num[0] == sh->pd_idx)  in handle_stripe()
4423 		|| (s.failed >= 2 && s.failed_num[1] == sh->pd_idx);  in handle_stripe()
4495 		if (test_and_clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags))  in handle_stripe()
5086 		set_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags);  in make_discard_request()
5092 		clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags);  in make_discard_request()
5095 			if (d == sh->pd_idx || d == sh->qd_idx)  in make_discard_request()
5109 			if (d == sh->pd_idx || d == sh->qd_idx)  in make_discard_request()
5493 			if (j == sh->pd_idx)  in reshape_request()