I would like to avoid modifying rootflags inside grub config so if I change anything in fstab I don't have to change that in other places as well. Unless grub-mkconfig can somehow be taught to parse fstab and set the rootflags according to it. On 20 January 2016 at 21:43, Devon Smith <devo8604@xxxxxxxxx> wrote: > Garmine, > If you are using grub2 you should be able to add that option in > your grub config, then regenerate it, that will make that option > permanent and you wont have to add it every time at boot. Also, if > 'ro' is in your kernel params at boot, then im pretty sure masking the > remount service will ensure that your root remains mounted ro... > > Devon > > On Wed, Jan 20, 2016 at 1:34 PM, Garmine 42 <mikro001@xxxxxxxxx> wrote: >> On 20 January 2016 at 21:18, Leonid Isaev >> <leonid.isaev@xxxxxxxxxxxxxxxxx> wrote: >>> On Wed, Jan 20, 2016 at 09:01:22PM +0100, Garmine 42 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. >>> >>> Why is it ignored? >>> /dev/sda4 on / type btrfs (ro,nodev,relatime,compress=zlib,ssd,space_cache,autodefrag,subvolid=257,subvol=/_root) >>> ^^^^^^^^^^^ >> >> The linux-btrfs discussion suggests that some mount options might be >> unchanged after a remount even if it should change based on the fstab. >> >> Although that particular discussion's exact problem was something else >> in my opinion, so they might be wrong on that. The fix for that >> problem was including the problematic option (space_cache=v2) in the >> rootflags parameter. Considering the cmdline size is limited and I >> want to avoid modifying that all the time, I want to mount the root >> volume with the correct flags in the first place. >> >>> Also, there is fstab in the initramfs: >>> $ lsinitcpio /boot/initramfs-linux.img | grep fstab >>> etc/fstab >> >> That fstab is an empty file (ran in an uncompreseed initrd): >> % wc -c etc/fstab >> 0 etc/fstab >> >>> Have you tried masking the systemd-remount-fs.service? >> >> First I will try to exclude root= and rootflags= parameters from the >> cmdline and include the fstab via mkinitcpio and see if it finds the >> root. Do I want to mask remount-fs in this case? >> >>> Cheers, >>> -- >>> Leonid Isaev >>> GPG fingerprints: DA92 034D B4A8 EC51 7EA6 20DF 9291 EE8A 043C B8C4 >>> C0DF 20D0 C075 C3F1 E1BE 775A A7AE F6CB 164B 5A6D
