drivers/md/raid5.c

921 	int dd_idx;
952 	dd_idx = 0;
953 	while (dd_idx == sh->pd_idx || dd_idx == sh->qd_idx)
954 		dd_idx++;
955 	if (head->dev[dd_idx].towrite->bi_opf != sh->dev[dd_idx].towrite->bi_opf ||
956 	    bio_op(head->dev[dd_idx].towrite) != bio_op(sh->dev[dd_idx].towrite))
2959 			      int previous, int *dd_idx,
2988 	*dd_idx = sector_div(stripe, data_disks);
3002 			if (*dd_idx >= pd_idx)
3003 				(*dd_idx)++;
3007 			if (*dd_idx >= pd_idx)
3008 				(*dd_idx)++;
3012 			*dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks;
3016 			*dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks;
3020 			(*dd_idx)++;
3036 				(*dd_idx)++;	/* Q D D D P */
3038 			} else if (*dd_idx >= pd_idx)
3039 				(*dd_idx) += 2; /* D D P Q D */
3045 				(*dd_idx)++;	/* Q D D D P */
3047 			} else if (*dd_idx >= pd_idx)
3048 				(*dd_idx) += 2; /* D D P Q D */
3053 			*dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks;
3058 			*dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks;
3064 			(*dd_idx) += 2;
3078 				(*dd_idx)++;	/* Q D D D P */
3080 			} else if (*dd_idx >= pd_idx)
3081 				(*dd_idx) += 2; /* D D P Q D */
3094 				(*dd_idx)++;	/* Q D D D P */
3096 			} else if (*dd_idx >= pd_idx)
3097 				(*dd_idx) += 2; /* D D P Q D */
3105 			*dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks;
3112 			if (*dd_idx >= pd_idx)
3113 				(*dd_idx)++;
3119 			if (*dd_idx >= pd_idx)
3120 				(*dd_idx)++;
3126 			*dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1);
3132 			*dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1);
3138 			(*dd_idx)++;
3173 	int dummy1, dd_idx = i;
3271 	if (check != sh->sector || dummy1 != dd_idx || sh2.pd_idx != sh->pd_idx
3446 				int dd_idx, int forwrite)
3459 		bip = &sh->dev[dd_idx].towrite;
3461 		bip = &sh->dev[dd_idx].toread;
3488 			    (i == dd_idx || sh->dev[i].towrite)) {
3506 			     int dd_idx, int forwrite, int previous)
3513 		bip = &sh->dev[dd_idx].towrite;
3517 		bip = &sh->dev[dd_idx].toread;
3535 		sector_t sector = sh->dev[dd_idx].sector;
3536 		for (bi=sh->dev[dd_idx].towrite;
3537 		     sector < sh->dev[dd_idx].sector + RAID5_STRIPE_SECTORS(conf) &&
3539 		     bi = r5_next_bio(conf, bi, sh->dev[dd_idx].sector)) {
3543 		if (sector >= sh->dev[dd_idx].sector + RAID5_STRIPE_SECTORS(conf))
3544 			if (!test_and_set_bit(R5_OVERWRITE, &sh->dev[dd_idx].flags))
3549 		 (*bip)->bi_iter.bi_sector, sh->sector, dd_idx,
3550 		 sh->dev[dd_idx].sector);
3584 			   int dd_idx, int forwrite, int previous)
3588 	if (stripe_bio_overlaps(sh, bi, dd_idx, forwrite)) {
3589 		set_bit(R5_Overlap, &sh->dev[dd_idx].flags);
3594 	__add_stripe_bio(sh, bi, dd_idx, forwrite, previous);
3606 	int dd_idx;
3614 			     &dd_idx, sh);
4587 			int dd_idx, j;
4593 							  &dd_idx, NULL);
4603 			   test_bit(R5_Expanded, &sh2->dev[dd_idx].flags)) {
4611 			tx = async_memcpy(sh2->dev[dd_idx].page,
4612 					  sh->dev[i].page, sh2->dev[dd_idx].offset,
4616 			set_bit(R5_Expanded, &sh2->dev[dd_idx].flags);
4617 			set_bit(R5_UPTODATE, &sh2->dev[dd_idx].flags);
5455 	int dd_idx;
5464 				      &dd_idx, NULL);
5470 	rdev = conf->disks[dd_idx].replacement;
5473 		rdev = conf->disks[dd_idx].rdev;
5832 	int dd_idx;
5834 	for (dd_idx = 0; dd_idx < sh->disks; dd_idx++) {
5835 		if (dd_idx == sh->pd_idx || dd_idx == sh->qd_idx)
5838 		min_sector = min(min_sector, sh->dev[dd_idx].sector);
5839 		max_sector = max(max_sector, sh->dev[dd_idx].sector);
5858 	int dd_idx;
5863 	for (dd_idx = 0; dd_idx < sh->disks; dd_idx++) {
5864 		struct r5dev *dev = &sh->dev[dd_idx];
5866 		if (dd_idx == sh->pd_idx || dd_idx == sh->qd_idx)
5873 		if (stripe_bio_overlaps(sh, bi, dd_idx, forwrite)) {
5883 	for (dd_idx = 0; dd_idx < sh->disks; dd_idx++) {
5884 		struct r5dev *dev = &sh->dev[dd_idx];
5886 		if (dd_idx == sh->pd_idx || dd_idx == sh->qd_idx)
5893 		__add_stripe_bio(sh, bi, dd_idx, forwrite, previous);
5912 	int seq, dd_idx;
5942 					  &dd_idx, NULL);
6032 	int dd_idx;
6039 	sector = raid5_compute_sector(conf, r_sector, 0, &dd_idx, &sh);
6047 	dd_idx++;
6048 	while (dd_idx == sh.pd_idx || dd_idx == sh.qd_idx)
6049 		dd_idx++;
6050 	if (dd_idx >= raid_disks)
6209 	int dd_idx;
6395 				     1, &dd_idx, NULL);
6399 				     1, &dd_idx, NULL);
6565 	 * it will be only one 'dd_idx' and only need one call to raid5_compute_sector.
6568 	int dd_idx;
6576 				      0, &dd_idx, NULL);
6597 		if (!add_stripe_bio(sh, raid_bio, dd_idx, 0, 0)) {
6604 		set_bit(R5_ReadNoMerge, &sh->dev[dd_idx].flags);