md/raid1: add takeover support for raid5->raid1
A 2-device raid5 array can now be converted to raid1. Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown
parent
6eef4b21ff
commit
709ae4879a
2 changed files with 122 additions and 78 deletions
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@ -677,6 +677,7 @@ static void raise_barrier(conf_t *conf)
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static void lower_barrier(conf_t *conf)
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{
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unsigned long flags;
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BUG_ON(conf->barrier <= 0);
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spin_lock_irqsave(&conf->resync_lock, flags);
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conf->barrier--;
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spin_unlock_irqrestore(&conf->resync_lock, flags);
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@ -1960,74 +1961,48 @@ static sector_t raid1_size(mddev_t *mddev, sector_t sectors, int raid_disks)
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return mddev->dev_sectors;
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}
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static int run(mddev_t *mddev)
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static conf_t *setup_conf(mddev_t *mddev)
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{
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conf_t *conf;
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int i, j, disk_idx;
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int i;
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mirror_info_t *disk;
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mdk_rdev_t *rdev;
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int err = -ENOMEM;
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if (mddev->level != 1) {
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printk("raid1: %s: raid level not set to mirroring (%d)\n",
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mdname(mddev), mddev->level);
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goto out;
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}
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if (mddev->reshape_position != MaxSector) {
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printk("raid1: %s: reshape_position set but not supported\n",
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mdname(mddev));
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goto out;
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}
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/*
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* copy the already verified devices into our private RAID1
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* bookkeeping area. [whatever we allocate in run(),
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* should be freed in stop()]
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*/
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conf = kzalloc(sizeof(conf_t), GFP_KERNEL);
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mddev->private = conf;
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if (!conf)
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goto out_no_mem;
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goto abort;
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conf->mirrors = kzalloc(sizeof(struct mirror_info)*mddev->raid_disks,
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GFP_KERNEL);
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if (!conf->mirrors)
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goto out_no_mem;
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goto abort;
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conf->tmppage = alloc_page(GFP_KERNEL);
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if (!conf->tmppage)
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goto out_no_mem;
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goto abort;
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conf->poolinfo = kmalloc(sizeof(*conf->poolinfo), GFP_KERNEL);
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conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL);
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if (!conf->poolinfo)
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goto out_no_mem;
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conf->poolinfo->mddev = NULL;
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goto abort;
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conf->poolinfo->raid_disks = mddev->raid_disks;
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conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc,
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r1bio_pool_free,
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conf->poolinfo);
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if (!conf->r1bio_pool)
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goto out_no_mem;
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goto abort;
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conf->poolinfo->mddev = mddev;
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spin_lock_init(&conf->device_lock);
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mddev->queue->queue_lock = &conf->device_lock;
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list_for_each_entry(rdev, &mddev->disks, same_set) {
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disk_idx = rdev->raid_disk;
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int disk_idx = rdev->raid_disk;
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if (disk_idx >= mddev->raid_disks
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|| disk_idx < 0)
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continue;
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disk = conf->mirrors + disk_idx;
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disk->rdev = rdev;
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disk_stack_limits(mddev->gendisk, rdev->bdev,
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rdev->data_offset << 9);
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/* as we don't honour merge_bvec_fn, we must never risk
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* violating it, so limit ->max_sector to one PAGE, as
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* a one page request is never in violation.
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*/
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if (rdev->bdev->bd_disk->queue->merge_bvec_fn &&
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queue_max_sectors(mddev->queue) > (PAGE_SIZE>>9))
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blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9);
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disk->head_position = 0;
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}
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@ -2041,8 +2016,7 @@ static int run(mddev_t *mddev)
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bio_list_init(&conf->pending_bio_list);
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bio_list_init(&conf->flushing_bio_list);
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mddev->degraded = 0;
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conf->last_used = -1;
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for (i = 0; i < conf->raid_disks; i++) {
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disk = conf->mirrors + i;
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@ -2050,38 +2024,97 @@ static int run(mddev_t *mddev)
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if (!disk->rdev ||
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!test_bit(In_sync, &disk->rdev->flags)) {
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disk->head_position = 0;
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mddev->degraded++;
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if (disk->rdev)
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conf->fullsync = 1;
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} else if (conf->last_used < 0)
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/*
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* The first working device is used as a
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* starting point to read balancing.
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*/
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conf->last_used = i;
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}
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}
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if (mddev->degraded == conf->raid_disks) {
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err = -EIO;
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if (conf->last_used < 0) {
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printk(KERN_ERR "raid1: no operational mirrors for %s\n",
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mdname(mddev));
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goto out_free_conf;
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goto abort;
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}
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if (conf->raid_disks - mddev->degraded == 1)
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mddev->recovery_cp = MaxSector;
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/*
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* find the first working one and use it as a starting point
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* to read balancing.
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*/
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for (j = 0; j < conf->raid_disks &&
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(!conf->mirrors[j].rdev ||
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!test_bit(In_sync, &conf->mirrors[j].rdev->flags)) ; j++)
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/* nothing */;
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conf->last_used = j;
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mddev->thread = md_register_thread(raid1d, mddev, NULL);
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if (!mddev->thread) {
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err = -ENOMEM;
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conf->thread = md_register_thread(raid1d, mddev, NULL);
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if (!conf->thread) {
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printk(KERN_ERR
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"raid1: couldn't allocate thread for %s\n",
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mdname(mddev));
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goto out_free_conf;
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goto abort;
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}
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return conf;
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abort:
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if (conf) {
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if (conf->r1bio_pool)
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mempool_destroy(conf->r1bio_pool);
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kfree(conf->mirrors);
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safe_put_page(conf->tmppage);
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kfree(conf->poolinfo);
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kfree(conf);
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}
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return ERR_PTR(err);
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}
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static int run(mddev_t *mddev)
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{
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conf_t *conf;
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int i;
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mdk_rdev_t *rdev;
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if (mddev->level != 1) {
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printk("raid1: %s: raid level not set to mirroring (%d)\n",
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mdname(mddev), mddev->level);
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return -EIO;
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}
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if (mddev->reshape_position != MaxSector) {
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printk("raid1: %s: reshape_position set but not supported\n",
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mdname(mddev));
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return -EIO;
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}
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/*
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* copy the already verified devices into our private RAID1
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* bookkeeping area. [whatever we allocate in run(),
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* should be freed in stop()]
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*/
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if (mddev->private == NULL)
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conf = setup_conf(mddev);
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else
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conf = mddev->private;
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if (IS_ERR(conf))
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return PTR_ERR(conf);
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mddev->queue->queue_lock = &conf->device_lock;
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list_for_each_entry(rdev, &mddev->disks, same_set) {
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disk_stack_limits(mddev->gendisk, rdev->bdev,
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rdev->data_offset << 9);
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/* as we don't honour merge_bvec_fn, we must never risk
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* violating it, so limit ->max_sector to one PAGE, as
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* a one page request is never in violation.
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*/
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if (rdev->bdev->bd_disk->queue->merge_bvec_fn &&
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queue_max_sectors(mddev->queue) > (PAGE_SIZE>>9))
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blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9);
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}
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mddev->degraded = 0;
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for (i=0; i < conf->raid_disks; i++)
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if (conf->mirrors[i].rdev == NULL ||
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!test_bit(In_sync, &conf->mirrors[i].rdev->flags) ||
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test_bit(Faulty, &conf->mirrors[i].rdev->flags))
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mddev->degraded++;
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if (conf->raid_disks - mddev->degraded == 1)
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mddev->recovery_cp = MaxSector;
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if (mddev->recovery_cp != MaxSector)
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printk(KERN_NOTICE "raid1: %s is not clean"
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" -- starting background reconstruction\n",
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@ -2090,9 +2123,14 @@ static int run(mddev_t *mddev)
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"raid1: raid set %s active with %d out of %d mirrors\n",
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mdname(mddev), mddev->raid_disks - mddev->degraded,
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mddev->raid_disks);
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/*
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* Ok, everything is just fine now
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*/
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mddev->thread = conf->thread;
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conf->thread = NULL;
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mddev->private = conf;
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md_set_array_sectors(mddev, raid1_size(mddev, 0, 0));
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mddev->queue->unplug_fn = raid1_unplug;
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@ -2100,23 +2138,6 @@ static int run(mddev_t *mddev)
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mddev->queue->backing_dev_info.congested_data = mddev;
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md_integrity_register(mddev);
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return 0;
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out_no_mem:
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printk(KERN_ERR "raid1: couldn't allocate memory for %s\n",
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mdname(mddev));
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out_free_conf:
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if (conf) {
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if (conf->r1bio_pool)
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mempool_destroy(conf->r1bio_pool);
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kfree(conf->mirrors);
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safe_put_page(conf->tmppage);
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kfree(conf->poolinfo);
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kfree(conf);
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mddev->private = NULL;
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}
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out:
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return -EIO;
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}
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static int stop(mddev_t *mddev)
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@ -2302,6 +2323,23 @@ static void raid1_quiesce(mddev_t *mddev, int state)
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}
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}
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static void *raid1_takeover(mddev_t *mddev)
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{
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/* raid1 can take over:
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* raid5 with 2 devices, any layout or chunk size
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*/
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if (mddev->level == 5 && mddev->raid_disks == 2) {
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conf_t *conf;
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mddev->new_level = 1;
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mddev->new_layout = 0;
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mddev->new_chunk_sectors = 0;
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conf = setup_conf(mddev);
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if (!IS_ERR(conf))
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conf->barrier = 1;
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return conf;
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}
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return ERR_PTR(-EINVAL);
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}
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static struct mdk_personality raid1_personality =
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{
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@ -2321,6 +2359,7 @@ static struct mdk_personality raid1_personality =
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.size = raid1_size,
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.check_reshape = raid1_reshape,
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.quiesce = raid1_quiesce,
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.takeover = raid1_takeover,
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};
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static int __init raid_init(void)
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@ -59,6 +59,11 @@ struct r1_private_data_s {
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mempool_t *r1bio_pool;
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mempool_t *r1buf_pool;
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/* When taking over an array from a different personality, we store
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* the new thread here until we fully activate the array.
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*/
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struct mdk_thread_s *thread;
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};
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typedef struct r1_private_data_s conf_t;
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