291 static inline void update_head_pos(int disk, struct r1bio *r1_bio)  in update_head_pos()  argument
295 	conf->mirrors[disk].head_position =  in update_head_pos()
520 	int disk;  in read_balance()  local
552 	for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) {  in read_balance()
559 		rdev = rcu_dereference(conf->mirrors[disk].rdev);  in read_balance()
560 		if (r1_bio->bios[disk] == IO_BLOCKED  in read_balance()
579 				best_dist_disk = disk;  in read_balance()
580 				best_pending_disk = disk;  in read_balance()
607 					best_disk = disk;  in read_balance()
619 		dist = abs(this_sector - conf->mirrors[disk].head_position);  in read_balance()
621 			best_disk = disk;  in read_balance()
625 		if (conf->mirrors[disk].next_seq_sect == this_sector  in read_balance()
628 			struct raid1_info *mirror = &conf->mirrors[disk];  in read_balance()
630 			best_disk = disk;  in read_balance()
656 			best_disk = disk;  in read_balance()
665 			best_pending_disk = disk;  in read_balance()
670 			best_dist_disk = disk;  in read_balance()
2289 	int disk;  in handle_read_error()  local
2317 	disk = read_balance(conf, r1_bio, &max_sectors);  in handle_read_error()
2318 	if (disk == -1) {  in handle_read_error()
2331 		r1_bio->read_disk = disk;  in handle_read_error()
2336 		rdev = conf->mirrors[disk].rdev;  in handle_read_error()
2484 	int disk = -1;  in sync_request()  local
2597 					if (disk < 0)  in sync_request()
2598 						disk = i;  in sync_request()
2625 	if (disk < 0)  in sync_request()
2626 		disk = wonly;  in sync_request()
2627 	r1_bio->read_disk = disk;  in sync_request()
2729 	} while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES);  in sync_request()
2778 	struct raid1_info *disk;  in setup_conf()  local
2817 			disk = conf->mirrors + mddev->raid_disks + disk_idx;  in setup_conf()
2819 			disk = conf->mirrors + disk_idx;  in setup_conf()
2821 		if (disk->rdev)  in setup_conf()
2823 		disk->rdev = rdev;  in setup_conf()
2826 		disk->head_position = 0;  in setup_conf()
2827 		disk->seq_start = MaxSector;  in setup_conf()
2847 		disk = conf->mirrors + i;  in setup_conf()
2850 		    disk[conf->raid_disks].rdev) {  in setup_conf()
2852 			if (!disk->rdev) {  in setup_conf()
2856 				disk->rdev =  in setup_conf()
2857 					disk[conf->raid_disks].rdev;  in setup_conf()
2858 				disk[conf->raid_disks].rdev = NULL;  in setup_conf()
2859 			} else if (!test_bit(In_sync, &disk->rdev->flags))  in setup_conf()
2864 		if (!disk->rdev ||  in setup_conf()
2865 		    !test_bit(In_sync, &disk->rdev->flags)) {  in setup_conf()
2866 			disk->head_position = 0;  in setup_conf()
2867 			if (disk->rdev &&  in setup_conf()
2868 			    (disk->rdev->saved_raid_disk < 0))  in setup_conf()