Re: Can't mount subvolume with ro option

["Sébastien ROHAUT" <sebastien.rohaut@free.fr>]

Le 28/06/2014 00:12, Chris Murphy a écrit :
> On Jun 27, 2014, at 4:08 PM, Chris Murphy <lists@colorremedies.com> wrote:
>
>> On Jun 27, 2014, at 2:07 PM, Sébastien ROHAUT <sebastien.rohaut@free.fr> wrote:
>>
>>> Hi,
>>>
>>> In the wiki, it's said we can mount subvolumes with different mount options. nosuid, nodev, rw and ro are listed, as valid generic mount options.
>> This might require 3.15. I don't recall it working with early 3.14 kernels, but by 3.14.3 I'd moved onto testing 3.15.
>
> [root@f20v ~]# mount /dev/sda3 /mnt
> [root@f20v ~]# btrfs subvol create /mnt/test
> Create subvolume '/mnt/test'
> [root@f20v ~]# umount /mnt
> [root@f20v ~]# mount -o ro,subvol=test /dev/sda3 /mnt
> mount: /dev/sda3 is already mounted or /mnt busy
>         /dev/sda3 is already mounted on /
>         /dev/sda3 is already mounted on /home
>         /dev/sda3 is already mounted on /var
>         /dev/sda3 is already mounted on /boot
> [root@f20v ~]# uname -r
> 3.14.6-200.fc20.x86_64
>
>
> I don't know if this feature will be backported to stable kernels. If not, then probably the wiki should say it's a 3.15+ feature.
> Chris Murphy
>
>
Thank you for your answer. I'm actually moving to a Fedora Rawhide (3.16 
kernel).

Sebastien Rohaut