288 static inline void update_head_pos(int disk, struct r1bio *r1_bio)  in update_head_pos()  argument
292 	conf->mirrors[disk].head_position =  in update_head_pos()
518 	int disk;  in read_balance()  local
550 	for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) {  in read_balance()
557 		rdev = rcu_dereference(conf->mirrors[disk].rdev);  in read_balance()
558 		if (r1_bio->bios[disk] == IO_BLOCKED  in read_balance()
578 				best_dist_disk = disk;  in read_balance()
579 				best_pending_disk = disk;  in read_balance()
606 					best_disk = disk;  in read_balance()
618 		dist = abs(this_sector - conf->mirrors[disk].head_position);  in read_balance()
620 			best_disk = disk;  in read_balance()
624 		if (conf->mirrors[disk].next_seq_sect == this_sector  in read_balance()
627 			struct raid1_info *mirror = &conf->mirrors[disk];  in read_balance()
629 			best_disk = disk;  in read_balance()
655 			best_disk = disk;  in read_balance()
664 			best_pending_disk = disk;  in read_balance()
669 			best_dist_disk = disk;  in read_balance()
720 		int disk;  in raid1_mergeable_bvec()  local
722 		for (disk = 0; disk < conf->raid_disks * 2; disk++) {  in raid1_mergeable_bvec()
724 				conf->mirrors[disk].rdev);  in raid1_mergeable_bvec()
2319 	int disk;  in handle_read_error()  local
2347 	disk = read_balance(conf, r1_bio, &max_sectors);  in handle_read_error()
2348 	if (disk == -1) {  in handle_read_error()
2361 		r1_bio->read_disk = disk;  in handle_read_error()
2366 		rdev = conf->mirrors[disk].rdev;  in handle_read_error()
2491 	int disk = -1;  in sync_request()  local
2594 					if (disk < 0)  in sync_request()
2595 						disk = i;  in sync_request()
2622 	if (disk < 0)  in sync_request()
2623 		disk = wonly;  in sync_request()
2624 	r1_bio->read_disk = disk;  in sync_request()
2726 	} while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES);  in sync_request()
2765 	struct raid1_info *disk;  in setup_conf()  local
2804 			disk = conf->mirrors + mddev->raid_disks + disk_idx;  in setup_conf()
2806 			disk = conf->mirrors + disk_idx;  in setup_conf()
2808 		if (disk->rdev)  in setup_conf()
2810 		disk->rdev = rdev;  in setup_conf()
2815 		disk->head_position = 0;  in setup_conf()
2816 		disk->seq_start = MaxSector;  in setup_conf()
2835 		disk = conf->mirrors + i;  in setup_conf()
2838 		    disk[conf->raid_disks].rdev) {  in setup_conf()
2840 			if (!disk->rdev) {  in setup_conf()
2844 				disk->rdev =  in setup_conf()
2845 					disk[conf->raid_disks].rdev;  in setup_conf()
2846 				disk[conf->raid_disks].rdev = NULL;  in setup_conf()
2847 			} else if (!test_bit(In_sync, &disk->rdev->flags))  in setup_conf()
2852 		if (!disk->rdev ||  in setup_conf()
2853 		    !test_bit(In_sync, &disk->rdev->flags)) {  in setup_conf()
2854 			disk->head_position = 0;  in setup_conf()
2855 			if (disk->rdev &&  in setup_conf()
2856 			    (disk->rdev->saved_raid_disk < 0))  in setup_conf()