drivers/md/raid5.c

919 	int dd_idx;
950 	dd_idx = 0;
951 	while (dd_idx == sh->pd_idx || dd_idx == sh->qd_idx)
952 		dd_idx++;
953 	if (head->dev[dd_idx].towrite->bi_opf != sh->dev[dd_idx].towrite->bi_opf ||
954 	    bio_op(head->dev[dd_idx].towrite) != bio_op(sh->dev[dd_idx].towrite))
2946 			      int previous, int *dd_idx,
2975 	*dd_idx = sector_div(stripe, data_disks);
2989 			if (*dd_idx >= pd_idx)
2990 				(*dd_idx)++;
2994 			if (*dd_idx >= pd_idx)
2995 				(*dd_idx)++;
2999 			*dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks;
3003 			*dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks;
3007 			(*dd_idx)++;
3023 				(*dd_idx)++;	/* Q D D D P */
3025 			} else if (*dd_idx >= pd_idx)
3026 				(*dd_idx) += 2; /* D D P Q D */
3032 				(*dd_idx)++;	/* Q D D D P */
3034 			} else if (*dd_idx >= pd_idx)
3035 				(*dd_idx) += 2; /* D D P Q D */
3040 			*dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks;
3045 			*dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks;
3051 			(*dd_idx) += 2;
3065 				(*dd_idx)++;	/* Q D D D P */
3067 			} else if (*dd_idx >= pd_idx)
3068 				(*dd_idx) += 2; /* D D P Q D */
3081 				(*dd_idx)++;	/* Q D D D P */
3083 			} else if (*dd_idx >= pd_idx)
3084 				(*dd_idx) += 2; /* D D P Q D */
3092 			*dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks;
3099 			if (*dd_idx >= pd_idx)
3100 				(*dd_idx)++;
3106 			if (*dd_idx >= pd_idx)
3107 				(*dd_idx)++;
3113 			*dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1);
3119 			*dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1);
3125 			(*dd_idx)++;
3160 	int dummy1, dd_idx = i;
3258 	if (check != sh->sector || dummy1 != dd_idx || sh2.pd_idx != sh->pd_idx
3433 				int dd_idx, int forwrite)
3446 		bip = &sh->dev[dd_idx].towrite;
3448 		bip = &sh->dev[dd_idx].toread;
3475 			    (i == dd_idx || sh->dev[i].towrite)) {
3493 			     int dd_idx, int forwrite, int previous)
3500 		bip = &sh->dev[dd_idx].towrite;
3504 		bip = &sh->dev[dd_idx].toread;
3522 		sector_t sector = sh->dev[dd_idx].sector;
3523 		for (bi=sh->dev[dd_idx].towrite;
3524 		     sector < sh->dev[dd_idx].sector + RAID5_STRIPE_SECTORS(conf) &&
3526 		     bi = r5_next_bio(conf, bi, sh->dev[dd_idx].sector)) {
3530 		if (sector >= sh->dev[dd_idx].sector + RAID5_STRIPE_SECTORS(conf))
3531 			if (!test_and_set_bit(R5_OVERWRITE, &sh->dev[dd_idx].flags))
3536 		 (*bip)->bi_iter.bi_sector, sh->sector, dd_idx,
3537 		 sh->dev[dd_idx].sector);
3551 			   int dd_idx, int forwrite, int previous)
3555 	if (stripe_bio_overlaps(sh, bi, dd_idx, forwrite)) {
3556 		set_bit(R5_Overlap, &sh->dev[dd_idx].flags);
3561 	__add_stripe_bio(sh, bi, dd_idx, forwrite, previous);
3573 	int dd_idx;
3581 			     &dd_idx, sh);
4538 			int dd_idx, j;
4544 							  &dd_idx, NULL);
4554 			   test_bit(R5_Expanded, &sh2->dev[dd_idx].flags)) {
4562 			tx = async_memcpy(sh2->dev[dd_idx].page,
4563 					  sh->dev[i].page, sh2->dev[dd_idx].offset,
4567 			set_bit(R5_Expanded, &sh2->dev[dd_idx].flags);
4568 			set_bit(R5_UPTODATE, &sh2->dev[dd_idx].flags);
5399 	int dd_idx;
5408 				      &dd_idx, NULL);
5414 	rdev = conf->disks[dd_idx].replacement;
5417 		rdev = conf->disks[dd_idx].rdev;
5768 	int dd_idx;
5770 	for (dd_idx = 0; dd_idx < sh->disks; dd_idx++) {
5771 		if (dd_idx == sh->pd_idx || dd_idx == sh->qd_idx)
5774 		min_sector = min(min_sector, sh->dev[dd_idx].sector);
5775 		max_sector = max(max_sector, sh->dev[dd_idx].sector);
5794 	int dd_idx;
5798 	for (dd_idx = 0; dd_idx < sh->disks; dd_idx++) {
5799 		struct r5dev *dev = &sh->dev[dd_idx];
5801 		if (dd_idx == sh->pd_idx || dd_idx == sh->qd_idx)
5808 		if (stripe_bio_overlaps(sh, bi, dd_idx, forwrite)) {
5823 	for (dd_idx = 0; dd_idx < sh->disks; dd_idx++) {
5824 		struct r5dev *dev = &sh->dev[dd_idx];
5826 		if (dd_idx == sh->pd_idx || dd_idx == sh->qd_idx)
5833 		__add_stripe_bio(sh, bi, dd_idx, forwrite, previous);
5888 	int dd_idx;
5895 	start = raid5_compute_sector(conf, start, 0, &dd_idx, NULL);
5896 	end = raid5_compute_sector(conf, end, 0, &dd_idx, NULL);
5914 	prev_start = raid5_compute_sector(conf, prev_start, 1, &dd_idx, NULL);
5915 	prev_end = raid5_compute_sector(conf, prev_end, 1, &dd_idx, NULL);
5936 	int seq, dd_idx;
5948 					  &dd_idx, NULL);
6038 	int dd_idx;
6045 	sector = raid5_compute_sector(conf, r_sector, 0, &dd_idx, &sh);
6053 	dd_idx++;
6054 	while (dd_idx == sh.pd_idx || dd_idx == sh.qd_idx)
6055 		dd_idx++;
6056 	if (dd_idx >= raid_disks)
6219 	int dd_idx;
6411 				     1, &dd_idx, NULL);
6415 				     1, &dd_idx, NULL);
6582 	 * it will be only one 'dd_idx' and only need one call to raid5_compute_sector.
6585 	int dd_idx;
6593 				      0, &dd_idx, NULL);
6614 		if (!add_stripe_bio(sh, raid_bio, dd_idx, 0, 0)) {
6621 		set_bit(R5_ReadNoMerge, &sh->dev[dd_idx].flags);