forked from luck/tmp_suning_uos_patched
[PATCH] md: Add sysfs access to raid6 stripe cache size
.. just as we already have for raid5. Signed-off-by: Neil Brown <neilb@suse.de> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown
Linus Torvalds
parent
978f946bb6
commit
35849c75d7
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@ -115,7 +115,7 @@ static void __release_stripe(raid6_conf_t *conf, struct stripe_head *sh)
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list_add_tail(&sh->lru, &conf->inactive_list);
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atomic_dec(&conf->active_stripes);
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if (!conf->inactive_blocked ||
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atomic_read(&conf->active_stripes) < (NR_STRIPES*3/4))
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atomic_read(&conf->active_stripes) < (conf->max_nr_stripes*3/4))
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wake_up(&conf->wait_for_stripe);
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}
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}
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@ -273,7 +273,8 @@ static struct stripe_head *get_active_stripe(raid6_conf_t *conf, sector_t sector
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conf->inactive_blocked = 1;
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wait_event_lock_irq(conf->wait_for_stripe,
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!list_empty(&conf->inactive_list) &&
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(atomic_read(&conf->active_stripes) < (NR_STRIPES *3/4)
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(atomic_read(&conf->active_stripes)
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< (conf->max_nr_stripes *3/4)
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|| !conf->inactive_blocked),
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conf->device_lock,
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unplug_slaves(conf->mddev);
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@ -302,9 +303,31 @@ static struct stripe_head *get_active_stripe(raid6_conf_t *conf, sector_t sector
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return sh;
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}
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static int grow_stripes(raid6_conf_t *conf, int num)
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static int grow_one_stripe(raid6_conf_t *conf)
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{
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struct stripe_head *sh;
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sh = kmem_cache_alloc(conf->slab_cache, GFP_KERNEL);
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if (!sh)
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return 0;
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memset(sh, 0, sizeof(*sh) + (conf->raid_disks-1)*sizeof(struct r5dev));
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sh->raid_conf = conf;
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spin_lock_init(&sh->lock);
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if (grow_buffers(sh, conf->raid_disks)) {
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shrink_buffers(sh, conf->raid_disks);
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kmem_cache_free(conf->slab_cache, sh);
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return 0;
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}
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/* we just created an active stripe so... */
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atomic_set(&sh->count, 1);
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atomic_inc(&conf->active_stripes);
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INIT_LIST_HEAD(&sh->lru);
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release_stripe(sh);
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return 1;
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}
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static int grow_stripes(raid6_conf_t *conf, int num)
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{
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kmem_cache_t *sc;
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int devs = conf->raid_disks;
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@ -316,44 +339,33 @@ static int grow_stripes(raid6_conf_t *conf, int num)
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if (!sc)
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return 1;
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conf->slab_cache = sc;
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while (num--) {
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sh = kmem_cache_alloc(sc, GFP_KERNEL);
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if (!sh)
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while (num--)
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if (!grow_one_stripe(conf))
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return 1;
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memset(sh, 0, sizeof(*sh) + (devs-1)*sizeof(struct r5dev));
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sh->raid_conf = conf;
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spin_lock_init(&sh->lock);
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if (grow_buffers(sh, conf->raid_disks)) {
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shrink_buffers(sh, conf->raid_disks);
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kmem_cache_free(sc, sh);
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return 1;
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}
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/* we just created an active stripe so... */
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atomic_set(&sh->count, 1);
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atomic_inc(&conf->active_stripes);
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INIT_LIST_HEAD(&sh->lru);
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release_stripe(sh);
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}
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return 0;
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}
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static int drop_one_stripe(raid6_conf_t *conf)
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{
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struct stripe_head *sh;
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spin_lock_irq(&conf->device_lock);
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sh = get_free_stripe(conf);
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spin_unlock_irq(&conf->device_lock);
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if (!sh)
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return 0;
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if (atomic_read(&sh->count))
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BUG();
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shrink_buffers(sh, conf->raid_disks);
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kmem_cache_free(conf->slab_cache, sh);
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atomic_dec(&conf->active_stripes);
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return 1;
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}
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static void shrink_stripes(raid6_conf_t *conf)
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{
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struct stripe_head *sh;
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while (drop_one_stripe(conf))
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;
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while (1) {
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spin_lock_irq(&conf->device_lock);
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sh = get_free_stripe(conf);
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spin_unlock_irq(&conf->device_lock);
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if (!sh)
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break;
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if (atomic_read(&sh->count))
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BUG();
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shrink_buffers(sh, conf->raid_disks);
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kmem_cache_free(conf->slab_cache, sh);
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atomic_dec(&conf->active_stripes);
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}
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kmem_cache_destroy(conf->slab_cache);
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conf->slab_cache = NULL;
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}
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@ -1912,6 +1924,74 @@ static void raid6d (mddev_t *mddev)
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PRINTK("--- raid6d inactive\n");
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}
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static ssize_t
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raid6_show_stripe_cache_size(mddev_t *mddev, char *page)
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{
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raid6_conf_t *conf = mddev_to_conf(mddev);
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if (conf)
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return sprintf(page, "%d\n", conf->max_nr_stripes);
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else
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return 0;
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}
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static ssize_t
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raid6_store_stripe_cache_size(mddev_t *mddev, const char *page, size_t len)
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{
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raid6_conf_t *conf = mddev_to_conf(mddev);
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char *end;
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int new;
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if (len >= PAGE_SIZE)
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return -EINVAL;
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if (!conf)
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return -ENODEV;
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new = simple_strtoul(page, &end, 10);
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if (!*page || (*end && *end != '\n') )
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return -EINVAL;
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if (new <= 16 || new > 32768)
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return -EINVAL;
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while (new < conf->max_nr_stripes) {
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if (drop_one_stripe(conf))
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conf->max_nr_stripes--;
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else
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break;
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}
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while (new > conf->max_nr_stripes) {
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if (grow_one_stripe(conf))
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conf->max_nr_stripes++;
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else break;
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}
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return len;
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}
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static struct md_sysfs_entry
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raid6_stripecache_size = __ATTR(stripe_cache_size, S_IRUGO | S_IWUSR,
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raid6_show_stripe_cache_size,
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raid6_store_stripe_cache_size);
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static ssize_t
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stripe_cache_active_show(mddev_t *mddev, char *page)
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{
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raid6_conf_t *conf = mddev_to_conf(mddev);
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if (conf)
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return sprintf(page, "%d\n", atomic_read(&conf->active_stripes));
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else
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return 0;
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}
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static struct md_sysfs_entry
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raid6_stripecache_active = __ATTR_RO(stripe_cache_active);
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static struct attribute *raid6_attrs[] = {
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&raid6_stripecache_size.attr,
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&raid6_stripecache_active.attr,
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NULL,
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};
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static struct attribute_group raid6_attrs_group = {
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.name = NULL,
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.attrs = raid6_attrs,
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};
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static int run(mddev_t *mddev)
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{
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raid6_conf_t *conf;
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@ -2095,6 +2175,7 @@ static int stop (mddev_t *mddev)
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shrink_stripes(conf);
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kfree(conf->stripe_hashtbl);
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blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
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sysfs_remove_group(&mddev->kobj, &raid6_attrs_group);
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kfree(conf);
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mddev->private = NULL;
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return 0;
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