md/raid5: refactor raid5 "run"
.. so that the code to create the private data structures is separate. This will help with future code to change the level of an active array. Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown
parent
34817e8c39
commit
91adb56473
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@ -4164,33 +4164,147 @@ static struct attribute_group raid5_attrs_group = {
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.attrs = raid5_attrs,
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};
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static int run(mddev_t *mddev)
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static raid5_conf_t *setup_conf(mddev_t *mddev)
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{
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raid5_conf_t *conf;
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int raid_disk, memory;
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mdk_rdev_t *rdev;
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struct disk_info *disk;
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int working_disks = 0;
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if (mddev->level != 5 && mddev->level != 4 && mddev->level != 6) {
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if (mddev->new_level != 5
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&& mddev->new_level != 4
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&& mddev->new_level != 6) {
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printk(KERN_ERR "raid5: %s: raid level not set to 4/5/6 (%d)\n",
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mdname(mddev), mddev->level);
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return -EIO;
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mdname(mddev), mddev->new_level);
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return ERR_PTR(-EIO);
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}
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if ((mddev->level == 5 && !algorithm_valid_raid5(mddev->layout)) ||
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(mddev->level == 6 && !algorithm_valid_raid6(mddev->layout))) {
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if ((mddev->new_level == 5
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&& !algorithm_valid_raid5(mddev->new_layout)) ||
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(mddev->new_level == 6
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&& !algorithm_valid_raid6(mddev->new_layout))) {
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printk(KERN_ERR "raid5: %s: layout %d not supported\n",
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mdname(mddev), mddev->layout);
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return -EIO;
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mdname(mddev), mddev->new_layout);
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return ERR_PTR(-EIO);
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}
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if (mddev->new_level == 6 && mddev->raid_disks < 4) {
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printk(KERN_ERR "raid6: not enough configured devices for %s (%d, minimum 4)\n",
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mdname(mddev), mddev->raid_disks);
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return ERR_PTR(-EINVAL);
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}
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if (mddev->chunk_size < PAGE_SIZE) {
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printk(KERN_ERR "md/raid5: chunk_size must be at least "
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"PAGE_SIZE but %d < %ld\n",
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mddev->chunk_size, PAGE_SIZE);
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return -EINVAL;
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if (!mddev->new_chunk || mddev->new_chunk % PAGE_SIZE) {
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printk(KERN_ERR "raid5: invalid chunk size %d for %s\n",
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mddev->new_chunk, mdname(mddev));
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return ERR_PTR(-EINVAL);
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}
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conf = kzalloc(sizeof(raid5_conf_t), GFP_KERNEL);
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if (conf == NULL)
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goto abort;
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conf->raid_disks = mddev->raid_disks;
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if (mddev->reshape_position == MaxSector)
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conf->previous_raid_disks = mddev->raid_disks;
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else
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conf->previous_raid_disks = mddev->raid_disks - mddev->delta_disks;
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conf->disks = kzalloc(conf->raid_disks * sizeof(struct disk_info),
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GFP_KERNEL);
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if (!conf->disks)
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goto abort;
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conf->mddev = mddev;
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if ((conf->stripe_hashtbl = kzalloc(PAGE_SIZE, GFP_KERNEL)) == NULL)
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goto abort;
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if (mddev->new_level == 6) {
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conf->spare_page = alloc_page(GFP_KERNEL);
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if (!conf->spare_page)
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goto abort;
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}
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spin_lock_init(&conf->device_lock);
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init_waitqueue_head(&conf->wait_for_stripe);
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init_waitqueue_head(&conf->wait_for_overlap);
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INIT_LIST_HEAD(&conf->handle_list);
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INIT_LIST_HEAD(&conf->hold_list);
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INIT_LIST_HEAD(&conf->delayed_list);
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INIT_LIST_HEAD(&conf->bitmap_list);
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INIT_LIST_HEAD(&conf->inactive_list);
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atomic_set(&conf->active_stripes, 0);
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atomic_set(&conf->preread_active_stripes, 0);
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atomic_set(&conf->active_aligned_reads, 0);
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conf->bypass_threshold = BYPASS_THRESHOLD;
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pr_debug("raid5: run(%s) called.\n", mdname(mddev));
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list_for_each_entry(rdev, &mddev->disks, same_set) {
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raid_disk = rdev->raid_disk;
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if (raid_disk >= conf->raid_disks
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|| raid_disk < 0)
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continue;
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disk = conf->disks + raid_disk;
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disk->rdev = rdev;
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if (test_bit(In_sync, &rdev->flags)) {
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char b[BDEVNAME_SIZE];
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printk(KERN_INFO "raid5: device %s operational as raid"
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" disk %d\n", bdevname(rdev->bdev,b),
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raid_disk);
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} else
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/* Cannot rely on bitmap to complete recovery */
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conf->fullsync = 1;
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}
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conf->chunk_size = mddev->new_chunk;
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conf->level = mddev->new_level;
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if (conf->level == 6)
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conf->max_degraded = 2;
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else
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conf->max_degraded = 1;
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conf->algorithm = mddev->new_layout;
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conf->max_nr_stripes = NR_STRIPES;
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conf->expand_progress = mddev->reshape_position;
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memory = conf->max_nr_stripes * (sizeof(struct stripe_head) +
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conf->raid_disks * ((sizeof(struct bio) + PAGE_SIZE))) / 1024;
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if (grow_stripes(conf, conf->max_nr_stripes)) {
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printk(KERN_ERR
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"raid5: couldn't allocate %dkB for buffers\n", memory);
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goto abort;
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} else
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printk(KERN_INFO "raid5: allocated %dkB for %s\n",
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memory, mdname(mddev));
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conf->thread = md_register_thread(raid5d, mddev, "%s_raid5");
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if (!conf->thread) {
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printk(KERN_ERR
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"raid5: couldn't allocate thread for %s\n",
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mdname(mddev));
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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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shrink_stripes(conf);
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safe_put_page(conf->spare_page);
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kfree(conf->disks);
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kfree(conf->stripe_hashtbl);
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kfree(conf);
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return ERR_PTR(-EIO);
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} else
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return ERR_PTR(-ENOMEM);
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}
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static int run(mddev_t *mddev)
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{
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raid5_conf_t *conf;
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int working_disks = 0;
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mdk_rdev_t *rdev;
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if (mddev->reshape_position != MaxSector) {
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/* Check that we can continue the reshape.
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* Currently only disks can change, it must
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@ -4241,99 +4355,33 @@ static int run(mddev_t *mddev)
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}
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printk(KERN_INFO "raid5: reshape will continue\n");
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/* OK, we should be able to continue; */
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}
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mddev->private = kzalloc(sizeof (raid5_conf_t), GFP_KERNEL);
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if ((conf = mddev->private) == NULL)
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goto abort;
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if (mddev->reshape_position == MaxSector) {
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conf->previous_raid_disks = conf->raid_disks = mddev->raid_disks;
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} else {
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conf->raid_disks = mddev->raid_disks;
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conf->previous_raid_disks = mddev->raid_disks - mddev->delta_disks;
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BUG_ON(mddev->level != mddev->new_level);
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BUG_ON(mddev->layout != mddev->new_layout);
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BUG_ON(mddev->chunk_size != mddev->new_chunk);
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BUG_ON(mddev->delta_disks != 0);
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}
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conf = setup_conf(mddev);
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conf->disks = kzalloc(conf->raid_disks * sizeof(struct disk_info),
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GFP_KERNEL);
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if (!conf->disks)
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goto abort;
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if (conf == NULL)
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return -EIO;
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if (IS_ERR(conf))
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return PTR_ERR(conf);
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conf->mddev = mddev;
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if ((conf->stripe_hashtbl = kzalloc(PAGE_SIZE, GFP_KERNEL)) == NULL)
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goto abort;
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if (mddev->level == 6) {
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conf->spare_page = alloc_page(GFP_KERNEL);
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if (!conf->spare_page)
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goto abort;
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}
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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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init_waitqueue_head(&conf->wait_for_stripe);
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init_waitqueue_head(&conf->wait_for_overlap);
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INIT_LIST_HEAD(&conf->handle_list);
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INIT_LIST_HEAD(&conf->hold_list);
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INIT_LIST_HEAD(&conf->delayed_list);
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INIT_LIST_HEAD(&conf->bitmap_list);
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INIT_LIST_HEAD(&conf->inactive_list);
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atomic_set(&conf->active_stripes, 0);
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atomic_set(&conf->preread_active_stripes, 0);
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atomic_set(&conf->active_aligned_reads, 0);
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conf->bypass_threshold = BYPASS_THRESHOLD;
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pr_debug("raid5: run(%s) called.\n", mdname(mddev));
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list_for_each_entry(rdev, &mddev->disks, same_set) {
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raid_disk = rdev->raid_disk;
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if (raid_disk >= conf->raid_disks
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|| raid_disk < 0)
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continue;
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disk = conf->disks + raid_disk;
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disk->rdev = rdev;
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if (test_bit(In_sync, &rdev->flags)) {
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char b[BDEVNAME_SIZE];
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printk(KERN_INFO "raid5: device %s operational as raid"
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" disk %d\n", bdevname(rdev->bdev,b),
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raid_disk);
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working_disks++;
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} else
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/* Cannot rely on bitmap to complete recovery */
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conf->fullsync = 1;
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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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/*
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* 0 for a fully functional array, 1 or 2 for a degraded array.
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*/
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list_for_each_entry(rdev, &mddev->disks, same_set)
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if (rdev->raid_disk >= 0 &&
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test_bit(In_sync, &rdev->flags))
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working_disks++;
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mddev->degraded = conf->raid_disks - working_disks;
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conf->mddev = mddev;
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conf->chunk_size = mddev->chunk_size;
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conf->level = mddev->level;
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if (conf->level == 6)
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conf->max_degraded = 2;
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else
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conf->max_degraded = 1;
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conf->algorithm = mddev->layout;
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conf->max_nr_stripes = NR_STRIPES;
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conf->expand_progress = mddev->reshape_position;
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/* device size must be a multiple of chunk size */
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mddev->dev_sectors &= ~(mddev->chunk_size / 512 - 1);
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mddev->resync_max_sectors = mddev->dev_sectors;
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if (conf->level == 6 && conf->raid_disks < 4) {
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printk(KERN_ERR "raid6: not enough configured devices for %s (%d, minimum 4)\n",
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mdname(mddev), conf->raid_disks);
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goto abort;
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}
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if (!conf->chunk_size || conf->chunk_size % 4) {
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printk(KERN_ERR "raid5: invalid chunk size %d for %s\n",
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conf->chunk_size, mdname(mddev));
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goto abort;
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}
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if (mddev->degraded > conf->max_degraded) {
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printk(KERN_ERR "raid5: not enough operational devices for %s"
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" (%d/%d failed)\n",
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@ -4341,6 +4389,10 @@ static int run(mddev_t *mddev)
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goto abort;
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}
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/* device size must be a multiple of chunk size */
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mddev->dev_sectors &= ~(mddev->chunk_size / 512 - 1);
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mddev->resync_max_sectors = mddev->dev_sectors;
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if (mddev->degraded > 0 &&
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mddev->recovery_cp != MaxSector) {
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if (mddev->ok_start_degraded)
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@ -4356,27 +4408,6 @@ static int run(mddev_t *mddev)
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}
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}
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{
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mddev->thread = md_register_thread(raid5d, mddev, "%s_raid5");
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if (!mddev->thread) {
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printk(KERN_ERR
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"raid5: couldn't allocate thread for %s\n",
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mdname(mddev));
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goto abort;
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}
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}
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memory = conf->max_nr_stripes * (sizeof(struct stripe_head) +
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conf->raid_disks * ((sizeof(struct bio) + PAGE_SIZE))) / 1024;
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if (grow_stripes(conf, conf->max_nr_stripes)) {
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printk(KERN_ERR
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"raid5: couldn't allocate %dkB for buffers\n", memory);
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shrink_stripes(conf);
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md_unregister_thread(mddev->thread);
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goto abort;
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} else
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printk(KERN_INFO "raid5: allocated %dkB for %s\n",
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memory, mdname(mddev));
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if (mddev->degraded == 0)
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printk("raid5: raid level %d set %s active with %d out of %d"
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" devices, algorithm %d\n", conf->level, mdname(mddev),
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@ -4419,6 +4450,8 @@ static int run(mddev_t *mddev)
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"raid5: failed to create sysfs attributes for %s\n",
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mdname(mddev));
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mddev->queue->queue_lock = &conf->device_lock;
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mddev->queue->unplug_fn = raid5_unplug_device;
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mddev->queue->backing_dev_info.congested_data = mddev;
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mddev->queue->backing_dev_info.congested_fn = raid5_congested;
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@ -4430,7 +4463,11 @@ static int run(mddev_t *mddev)
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return 0;
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abort:
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if (mddev->thread)
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md_unregister_thread(mddev->thread);
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mddev->thread = NULL;
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if (conf) {
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shrink_stripes(conf);
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print_raid5_conf(conf);
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safe_put_page(conf->spare_page);
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kfree(conf->disks);
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@ -386,6 +386,11 @@ struct raid5_private_data {
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int pool_size; /* number of disks in stripeheads in pool */
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spinlock_t device_lock;
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struct disk_info *disks;
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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 raid5_private_data raid5_conf_t;
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