diff options
| -rw-r--r-- | drivers/md/md.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index b669971d4782..179ee4afe937 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -4053,6 +4053,34 @@ static struct md_sysfs_entry md_level = __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); static ssize_t +new_level_show(struct mddev *mddev, char *page) +{ + return sprintf(page, "%d\n", mddev->new_level); +} + +static ssize_t +new_level_store(struct mddev *mddev, const char *buf, size_t len) +{ + unsigned int n; + int err; + + err = kstrtouint(buf, 10, &n); + if (err < 0) + return err; + err = mddev_lock(mddev); + if (err) + return err; + + mddev->new_level = n; + md_update_sb(mddev, 1); + + mddev_unlock(mddev); + return len; +} +static struct md_sysfs_entry md_new_level = +__ATTR(new_level, 0664, new_level_show, new_level_store); + +static ssize_t layout_show(struct mddev *mddev, char *page) { /* just a number, not meaningful for all levels */ @@ -5583,6 +5611,7 @@ __ATTR(serialize_policy, S_IRUGO | S_IWUSR, serialize_policy_show, static struct attribute *md_default_attrs[] = { &md_level.attr, + &md_new_level.attr, &md_layout.attr, &md_raid_disks.attr, &md_uuid.attr, |