geom/raid/tr_raid1e.c

55     "Amount of the disk to rebuild each read/write cycle of the rebuild.");
63     "Fraction of the I/O bandwidth to use when disk busy for rebuild.");
149     int *disk, off_t *offset, off_t *start)
160 	*disk = (nstrip * N) % vol->v_disks_count;
161 	/* Strip start position in disk. */
166 P2V(struct g_raid_volume *vol, int disk, off_t offset,
176 	nstrip = (offset / strip_size) * vol->v_disks_count + disk;
339     struct g_raid_disk *disk)
345 	 * We don't fail the last disk in the pack, since it still has decent
346 	 * data on it and that's better than failing the disk if it is the root
360 	g_raid_fail_disk(sc, sd, disk);
438 	int disk, copy, best;
455 		V2P(vol, virtual, &disk, &offset, &start);
461 		/* Find disk with most accurate data. */
462 		best = g_raid_tr_raid1e_select_read_disk(vol, disk,
465 			/* There is no any valid disk. */
469 			/* Some other disk has better data. */
481 	    ((disk + best >= vol->v_disks_count) ? vol->v_strip_size : 0);
486 	bp->bio_caller1 = &vol->v_subdisks[(disk + best) % vol->v_disks_count];
546 		    "No failed disk to rebuild.  night night.");
635  * Select the disk to read from.  Take into account: subdisk state, running
636  * error recovery, average disk load, head position and possible cache hits.
676 		/* If disk head is precisely in position - highly prefer it. */
680 		/* If disk head is close to position - prefer it. */
717 		KASSERT(best >= 0, ("No readable disk in volume %s!",
856 	 * even when the disk is busy.  Be sure to only count real I/O
857 	 * to the disk.  All 'SPECIAL' I/O is traffic generated to the disk
898 	int error, do_write, copy, disk, best;
1008 		 * another disk drive, if available, before erroring out the
1030 		V2P(vol, virtual, &disk, &offset, &start);
1032 		/* Find the other disk, and try to do the I/O to it. */
1035 		    disk, offset, start, mask);
1037 			disk += best;
1038 			if (disk >= vol->v_disks_count) {
1039 				disk -= vol->v_disks_count;
1049 			nsd = &vol->v_subdisks[disk];
1069 		 * through.  This will happen when there's only one good disk.
1082 		V2P(vol, virtual, &disk, &offset, &start);
1084 		/* Find best disk to write. */
1086 		    disk, offset, start, ~mask);
1088 			disk += best;
1089 			if (disk >= vol->v_disks_count) {
1090 				disk -= vol->v_disks_count;
1100 			g_raid_subdisk_iostart(&vol->v_subdisks[disk], cbp);
1107 		 * For any write errors, we agressively fail the disk since
1117 		V2P(vol, virtual, &disk, &offset, &start);
1121 				vol->v_subdisks[(disk + copy) %