217 	if (idx == sh->pd_idx)  in raid6_idx_to_slot()
807 	while (dd_idx == sh->pd_idx || dd_idx == sh->qd_idx)  in stripe_add_to_batch_list()
1354 		if (i == sh->qd_idx || i == sh->pd_idx ||  in set_syndrome_sources()
1547 	int count = 0, pd_idx = sh->pd_idx, i;  in ops_run_prexor5()  local
1551 	struct page *xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page;  in ops_run_prexor5()
1658 	int pd_idx = sh->pd_idx;  in ops_complete_reconstruct()  local
1675 		if (dev->written || i == pd_idx || i == qd_idx) {  in ops_complete_reconstruct()
1705 	int count, pd_idx = sh->pd_idx, i;  in ops_run_reconstruct5()  local
1717 		if (pd_idx == i)  in ops_run_reconstruct5()
1724 		set_bit(R5_Discard, &sh->dev[pd_idx].flags);  in ops_run_reconstruct5()
1736 		xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page;  in ops_run_reconstruct5()
1743 		xor_dest = sh->dev[pd_idx].page;  in ops_run_reconstruct5()
1746 			if (i != pd_idx)  in ops_run_reconstruct5()
1799 		if (sh->pd_idx == i || sh->qd_idx == i)  in ops_run_reconstruct6()
1806 		set_bit(R5_Discard, &sh->dev[sh->pd_idx].flags);  in ops_run_reconstruct6()
1859 	int pd_idx = sh->pd_idx;  in ops_run_check_p()  local
1873 	xor_dest = sh->dev[pd_idx].page;  in ops_run_check_p()
1876 		if (i == pd_idx || i == qd_idx)  in ops_run_check_p()
2543 	int pd_idx, qd_idx;  in raid5_compute_sector()  local
2571 	pd_idx = qd_idx = -1;  in raid5_compute_sector()
2574 		pd_idx = data_disks;  in raid5_compute_sector()
2579 			pd_idx = data_disks - sector_div(stripe2, raid_disks);  in raid5_compute_sector()
2580 			if (*dd_idx >= pd_idx)  in raid5_compute_sector()
2584 			pd_idx = sector_div(stripe2, raid_disks);  in raid5_compute_sector()
2585 			if (*dd_idx >= pd_idx)  in raid5_compute_sector()
2589 			pd_idx = data_disks - sector_div(stripe2, raid_disks);  in raid5_compute_sector()
2590 			*dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks;  in raid5_compute_sector()
2593 			pd_idx = sector_div(stripe2, raid_disks);  in raid5_compute_sector()
2594 			*dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks;  in raid5_compute_sector()
2597 			pd_idx = 0;  in raid5_compute_sector()
2601 			pd_idx = data_disks;  in raid5_compute_sector()
2611 			pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks);  in raid5_compute_sector()
2612 			qd_idx = pd_idx + 1;  in raid5_compute_sector()
2613 			if (pd_idx == raid_disks-1) {  in raid5_compute_sector()
2616 			} else if (*dd_idx >= pd_idx)  in raid5_compute_sector()
2620 			pd_idx = sector_div(stripe2, raid_disks);  in raid5_compute_sector()
2621 			qd_idx = pd_idx + 1;  in raid5_compute_sector()
2622 			if (pd_idx == raid_disks-1) {  in raid5_compute_sector()
2625 			} else if (*dd_idx >= pd_idx)  in raid5_compute_sector()
2629 			pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks);  in raid5_compute_sector()
2630 			qd_idx = (pd_idx + 1) % raid_disks;  in raid5_compute_sector()
2631 			*dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks;  in raid5_compute_sector()
2634 			pd_idx = sector_div(stripe2, raid_disks);  in raid5_compute_sector()
2635 			qd_idx = (pd_idx + 1) % raid_disks;  in raid5_compute_sector()
2636 			*dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks;  in raid5_compute_sector()
2640 			pd_idx = 0;  in raid5_compute_sector()
2645 			pd_idx = data_disks;  in raid5_compute_sector()
2653 			pd_idx = sector_div(stripe2, raid_disks);  in raid5_compute_sector()
2654 			qd_idx = pd_idx + 1;  in raid5_compute_sector()
2655 			if (pd_idx == raid_disks-1) {  in raid5_compute_sector()
2658 			} else if (*dd_idx >= pd_idx)  in raid5_compute_sector()
2669 			pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks);  in raid5_compute_sector()
2670 			qd_idx = pd_idx + 1;  in raid5_compute_sector()
2671 			if (pd_idx == raid_disks-1) {  in raid5_compute_sector()
2674 			} else if (*dd_idx >= pd_idx)  in raid5_compute_sector()
2681 			pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks);  in raid5_compute_sector()
2682 			qd_idx = (pd_idx + raid_disks - 1) % raid_disks;  in raid5_compute_sector()
2683 			*dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks;  in raid5_compute_sector()
2689 			pd_idx = data_disks - sector_div(stripe2, raid_disks-1);  in raid5_compute_sector()
2690 			if (*dd_idx >= pd_idx)  in raid5_compute_sector()
2696 			pd_idx = sector_div(stripe2, raid_disks-1);  in raid5_compute_sector()
2697 			if (*dd_idx >= pd_idx)  in raid5_compute_sector()
2703 			pd_idx = data_disks - sector_div(stripe2, raid_disks-1);  in raid5_compute_sector()
2704 			*dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1);  in raid5_compute_sector()
2709 			pd_idx = sector_div(stripe2, raid_disks-1);  in raid5_compute_sector()
2710 			*dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1);  in raid5_compute_sector()
2715 			pd_idx = 0;  in raid5_compute_sector()
2727 		sh->pd_idx = pd_idx;  in raid5_compute_sector()
2758 	if (i == sh->pd_idx)  in compute_blocknr()
2766 			if (i > sh->pd_idx)  in compute_blocknr()
2771 			if (i < sh->pd_idx)  in compute_blocknr()
2773 			i -= (sh->pd_idx + 1);  in compute_blocknr()
2792 			if (sh->pd_idx == raid_disks-1)  in compute_blocknr()
2794 			else if (i > sh->pd_idx)  in compute_blocknr()
2799 			if (sh->pd_idx == raid_disks-1)  in compute_blocknr()
2803 				if (i < sh->pd_idx)  in compute_blocknr()
2805 				i -= (sh->pd_idx + 2);  in compute_blocknr()
2815 			if (sh->pd_idx == 0)  in compute_blocknr()
2819 				if (i < sh->pd_idx)  in compute_blocknr()
2821 				i -= (sh->pd_idx + 1);  in compute_blocknr()
2826 			if (i > sh->pd_idx)  in compute_blocknr()
2831 			if (i < sh->pd_idx)  in compute_blocknr()
2833 			i -= (sh->pd_idx + 1);  in compute_blocknr()
2849 	if (check != sh->sector || dummy1 != dd_idx || sh2.pd_idx != sh->pd_idx  in compute_blocknr()
2862 	int i, pd_idx = sh->pd_idx, qd_idx = sh->qd_idx, disks = sh->disks;  in schedule_reconstruction()  local
2898 		BUG_ON(!(test_bit(R5_UPTODATE, &sh->dev[pd_idx].flags) ||  in schedule_reconstruction()
2899 			test_bit(R5_Wantcompute, &sh->dev[pd_idx].flags)));  in schedule_reconstruction()
2906 			if (i == pd_idx || i == qd_idx)  in schedule_reconstruction()
2930 	set_bit(R5_LOCKED, &sh->dev[pd_idx].flags);  in schedule_reconstruction()
2931 	clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags);  in schedule_reconstruction()
3196 	if (test_and_clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags))  in handle_failed_sync()
3337 		if (s->failed_num[i] != sh->pd_idx &&  in need_this_block()
3508 	    test_bit(R5_Discard, &sh->dev[sh->pd_idx].flags)) {  in handle_stripe_clean_event()
3510 		clear_bit(R5_Discard, &sh->dev[sh->pd_idx].flags);  in handle_stripe_clean_event()
3511 		clear_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags);  in handle_stripe_clean_event()
3577 		if ((dev->towrite || i == sh->pd_idx || i == sh->qd_idx) &&  in handle_stripe_dirtying()
3588 		    i != sh->pd_idx && i != sh->qd_idx &&  in handle_stripe_dirtying()
3609 			if ((dev->towrite || i == sh->pd_idx || i == sh->qd_idx) &&  in handle_stripe_dirtying()
3635 			    i != sh->pd_idx && i != sh->qd_idx &&  in handle_stripe_dirtying()
3696 			clear_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags);  in handle_parity_checks5()
3705 			dev = &sh->dev[sh->pd_idx];  in handle_parity_checks5()
3752 					&sh->dev[sh->pd_idx].flags);  in handle_parity_checks5()
3753 				sh->ops.target = sh->pd_idx;  in handle_parity_checks5()
3773 	int pd_idx = sh->pd_idx;  in handle_parity_checks6()  local
3813 			clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags);  in handle_parity_checks6()
3852 			dev = &sh->dev[pd_idx];  in handle_parity_checks6()
3909 						&sh->dev[pd_idx].flags);  in handle_parity_checks6()
3910 					*target = pd_idx;  in handle_parity_checks6()
3944 		if (i != sh->pd_idx && i != sh->qd_idx) {  in handle_stripe_expansion()
3975 				if (j != sh2->pd_idx &&  in handle_stripe_expansion()
4323 	       atomic_read(&sh->count), sh->pd_idx, sh->qd_idx,  in handle_stripe()
4379 		BUG_ON(!test_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags) &&  in handle_stripe()
4380 		       !test_bit(R5_Discard, &sh->dev[sh->pd_idx].flags));  in handle_stripe()
4387 				(i == sh->pd_idx || i == sh->qd_idx ||  in handle_stripe()
4396 				    ((i == sh->pd_idx || i == sh->qd_idx)  &&  in handle_stripe()
4409 	pdev = &sh->dev[sh->pd_idx];  in handle_stripe()
4410 	s.p_failed = (s.failed >= 1 && s.failed_num[0] == sh->pd_idx)  in handle_stripe()
4411 		|| (s.failed >= 2 && s.failed_num[1] == sh->pd_idx);  in handle_stripe()
4483 		if (test_and_clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags))  in handle_stripe()
5091 		set_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags);  in make_discard_request()
5097 		clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags);  in make_discard_request()
5100 			if (d == sh->pd_idx || d == sh->qd_idx)  in make_discard_request()
5114 			if (d == sh->pd_idx || d == sh->qd_idx)  in make_discard_request()
5480 			if (j == sh->pd_idx)  in reshape_request()