On Tue, Jun 16, 2015 at 01:42:54PM +0800, Tom Yan wrote: > [tom@localhost ~]$ mount | grep sda2 > /dev/sda2 on / type btrfs (rw,relatime,ssd,space_cache) > > [tom@localhost ~]$ cat /proc/self/mountinfo | grep sda2 > 19 0 0:17 /arch / rw,relatime shared:1 - btrfs /dev/sda2 rw,ssd,space_cache > > [tom@localhost ~]$ findmnt /dev/sda2 > TARGET SOURCE FSTYPE OPTIONS > / /dev/sda2[/arch] btrfs rw,relatime,ssd,space_cache > > It won't be shown as a mount option. Ah, good point. Yes, the subvolume directory is interpreted as FS mount root, I forgot this btrfs feature. Karel -- Karel Zak <kzak@xxxxxxxxxx> http://karelzak.blogspot.com -- To unsubscribe from this list: send the line "unsubscribe util-linux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html