diff options
| -rw-r--r-- | drivers/md/raid1.c | 35 | ||||
| -rw-r--r-- | drivers/md/raid1.h | 11 |
2 files changed, 12 insertions, 34 deletions
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index d3d3568b4fb1..fb96c0c2db40 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -497,9 +497,8 @@ static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sect const sector_t this_sector = r1_bio->sector; int sectors; int best_good_sectors; - int start_disk; int best_disk; - int i; + int disk; sector_t best_dist; struct md_rdev *rdev; int choose_first; @@ -517,23 +516,16 @@ static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sect best_good_sectors = 0; if (conf->mddev->recovery_cp < MaxSector && - (this_sector + sectors >= conf->next_resync)) { + (this_sector + sectors >= conf->next_resync)) choose_first = 1; - start_disk = 0; - } else { + else choose_first = 0; - start_disk = conf->last_used; - } - for (i = 0 ; i < conf->raid_disks * 2 ; i++) { + for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) { sector_t dist; sector_t first_bad; int bad_sectors; - int disk = start_disk + i; - if (disk >= conf->raid_disks * 2) - disk -= conf->raid_disks * 2; - rdev = rcu_dereference(conf->mirrors[disk].rdev); if (r1_bio->bios[disk] == IO_BLOCKED || rdev == NULL @@ -594,7 +586,7 @@ static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sect dist = abs(this_sector - conf->mirrors[disk].head_position); if (choose_first /* Don't change to another disk for sequential reads */ - || conf->next_seq_sect == this_sector + || conf->mirrors[disk].next_seq_sect == this_sector || dist == 0 /* If device is idle, use it */ || atomic_read(&rdev->nr_pending) == 0) { @@ -620,8 +612,7 @@ static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sect goto retry; } sectors = best_good_sectors; - conf->next_seq_sect = this_sector + sectors; - conf->last_used = best_disk; + conf->mirrors[best_disk].next_seq_sect = this_sector + sectors; } rcu_read_unlock(); *max_sectors = sectors; @@ -2599,7 +2590,6 @@ static struct r1conf *setup_conf(struct mddev *mddev) conf->recovery_disabled = mddev->recovery_disabled - 1; err = -EIO; - conf->last_used = -1; for (i = 0; i < conf->raid_disks * 2; i++) { disk = conf->mirrors + i; @@ -2625,19 +2615,9 @@ static struct r1conf *setup_conf(struct mddev *mddev) if (disk->rdev && (disk->rdev->saved_raid_disk < 0)) conf->fullsync = 1; - } else if (conf->last_used < 0) - /* - * The first working device is used as a - * starting point to read balancing. - */ - conf->last_used = i; + } } - if (conf->last_used < 0) { - printk(KERN_ERR "md/raid1:%s: no operational mirrors\n", - mdname(mddev)); - goto abort; - } err = -ENOMEM; conf->thread = md_register_thread(raid1d, mddev, "raid1"); if (!conf->thread) { @@ -2894,7 +2874,6 @@ static int raid1_reshape(struct mddev *mddev) conf->raid_disks = mddev->raid_disks = raid_disks; mddev->delta_disks = 0; - conf->last_used = 0; /* just make sure it is in-range */ lower_barrier(conf); set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); diff --git a/drivers/md/raid1.h b/drivers/md/raid1.h index 4e3613daaea2..3770b4a27662 100644 --- a/drivers/md/raid1.h +++ b/drivers/md/raid1.h @@ -4,6 +4,11 @@ struct raid1_info { struct md_rdev *rdev; sector_t head_position; + + /* When choose the best device for a read (read_balance()) + * we try to keep sequential reads one the same device + */ + sector_t next_seq_sect; }; /* @@ -29,12 +34,6 @@ struct r1conf { */ int raid_disks; - /* When choose the best device for a read (read_balance()) - * we try to keep sequential reads one the same device - * using 'last_used' and 'next_seq_sect' - */ - int last_used; - sector_t next_seq_sect; /* During resync, read_balancing is only allowed on the part * of the array that has been resynced. 'next_resync' tells us * where that is. |