Comment 14 for bug 771748

I really don't want to special case btrfs.
But I see that with very large hard-drives it can be a pain.
Note, that earlier mentions of ext4 do not apply here as most of the time it, fsck on ext4 quits reporting filesystems as clean.
Maybe a configuration options should be included to prevent including btrfs fsck into initramfs if one doesn't want to.... but then no btrfsck will be available in the initramfs, when one would want / need it.