skip match_mddev_units check for special roles

match_mddev_units is used to check whether 2 RAID arrays share
same disk(s). Arrays that share disk(s) will not do resync at the
same time for better performance (fewer HDD seek). However, this
check should not apply to Spare, Faulty, and Journal disks, as
they do not paticipate in resync.

In this patch, match_mddev_units skips check for disks with flag
"Faulty" or "Journal" or raid_disk < 0.

Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: NeilBrown <neilb@suse.com>
This commit is contained in:
Song Liu 2015-09-03 23:00:35 -07:00 коммит произвёл NeilBrown
Родитель 253f9fd41a
Коммит 0b020e85bd
1 изменённых файлов: 12 добавлений и 2 удалений

Просмотреть файл

@ -1935,13 +1935,23 @@ static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
struct md_rdev *rdev, *rdev2;
rcu_read_lock();
rdev_for_each_rcu(rdev, mddev1)
rdev_for_each_rcu(rdev2, mddev2)
rdev_for_each_rcu(rdev, mddev1) {
if (test_bit(Faulty, &rdev->flags) ||
test_bit(Journal, &rdev->flags) ||
rdev->raid_disk == -1)
continue;
rdev_for_each_rcu(rdev2, mddev2) {
if (test_bit(Faulty, &rdev2->flags) ||
test_bit(Journal, &rdev2->flags) ||
rdev2->raid_disk == -1)
continue;
if (rdev->bdev->bd_contains ==
rdev2->bdev->bd_contains) {
rcu_read_unlock();
return 1;
}
}
}
rcu_read_unlock();
return 0;
}