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Date: Tue, 16 Jun 2015 10:59:19 +0200
From: Karel Zak <kzak@redhat.com>
To: Tom Yan <tom.ty89@gmail.com>
Cc: james harvey <jamespharvey20@gmail.com>, util-linux@vger.kernel.org
Subject: Re: Mount doesn't show subvol option for btrfs
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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@redhat.com>
 http://karelzak.blogspot.com