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

[Garmine 42]

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