[arch-general] Mounting root according to fstab the first time (fstab in initrd)?

[Garmine 42]

P.s.: link to the mailing list thread about the mentioned discussion:
http://article.gmane.org/gmane.comp.file-systems.btrfs/52312

On 20 January 2016 at 21:01, Garmine 42 <mikro001 at gmail.com> wrote:
> There was a discussion on the linux-btrfs mailing list about this, and
> for example the btrfs space_cache option can not be changed with a
> remount - this causes the fstab file's space_cache option to be
> basically ignored. I want to eliminate this kind of issue on my setup,
> that's why I need to avoid root being remounted. Instead I want root
> to be mounted with the options specified in fstab the first (and only)
> time.
>
> On 20 January 2016 at 20:56, Devon Smith <devo8604 at gmail.com> wrote:
>> According to this page:
>> http://www.freedesktop.org/software/systemd/man/systemd-remount-fs.service.html
>>
>> The systemd remount service remounts your root file system according
>> to what is listed in fstab. This includes mounting root with the mount
>> options listed therein.
>>
>> If you need something else, what exactly are you trying to do?
>>
>> Devon
>>
>> On Wed, Jan 20, 2016 at 12:16 PM, Garmine 42 <mikro001 at gmail.com> wrote:
>>> Hi!
>>>
>>> My concern is that there are a few mount flags which can not be
>>> changed with a remount (at least on some FSes such as btrfs).
>>>
>>> Now as far as I understand, the kernel mounts root RO after boot using
>>> the root and rootflags parameters. I also found that you can include
>>> /etc/fstab in the initrd. How can I convince the kernel to mount every
>>> volume including the root according to fstab instead of the kernel
>>> paramters?
>>>
>>> In case the kernel isn't the one which reads fstab (which I suspect),
>>> can I include some binary in the initrd that would read fstab and
>>> handle the mounting for me?
>>>
>>> Or should I just scrap the whole above idea and write something
>>> that'll a) read the root volume's options from fstab and put it on the
>>> cmdline through e.g. a grub-mkconfig script?
>>>
>>> Thanks in advance!
>>>
>>> Regards,
>>> Garmine