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tabanus
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Joined: 11 Jun 2004
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Location: UK
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 Posted: Sun Dec 30, 2012 1:36 am Post subject: Root Filesystem Mounting Read Only [Solved] |
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I decided to re-install Gentoo to move from 32 to 64 bit. But now, the root file system is getting mounted read only. I can manually re-mount read-write at the end of the boot process, but I'd prefer a proper solution.
The error seems to come when starting the root service, and I get the error:
"root filesystem could not be mounted read/write"
The stage 3 that I installed had openrc-0.11.8. Downgrading to 0.11.6 made no difference
In my kernel config (gentoo-sources-3.7.1) I have
# CONFIG_DEVTMPFS is not set
CONFIG_TMPFS=y
CONFIG_TMPFS_POSIX_ACL=y
CONFIG_TMPFS_XATTR=y
I tried initially with CONFIG_DEVTMPFS=y but it didn't work either.
Re-installing udev not helped either.
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Last edited by tabanus on Sun Dec 30, 2012 3:01 pm; edited 1 time in total |
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BillWho
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| Posted: Sun Dec 30, 2012 1:47 am Post subject: |
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tabanus,
This might not solve your problem immediately, but these should be set: CONFIG_DEVTMPFS=y and CONFIG_DEVTMPFS_MOUNT=y
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tabanus
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Joined: 11 Jun 2004
Posts: 577
Location: UK
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| Posted: Sun Dec 30, 2012 2:53 am Post subject: |
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| BillWho wrote: | tabanus,
This might not solve your problem immediately, but these should be set: CONFIG_DEVTMPFS=y and CONFIG_DEVTMPFS_MOUNT=y |
OK, I've re-set them, not made any difference though, and my old 32-bit install doesn't have this set.
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duby2291
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Joined: 17 Oct 2004
Posts: 405
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| Posted: Sun Dec 30, 2012 3:25 am Post subject: |
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| tabanus wrote: | | BillWho wrote: | tabanus,
This might not solve your problem immediately, but these should be set: CONFIG_DEVTMPFS=y and CONFIG_DEVTMPFS_MOUNT=y |
OK, I've re-set them, not made any difference though, and my old 32-bit install doesn't have this set. |
Under psuedo-filesystems in menuconfig make sure tmpfs is checked. I already went through the rounds with that problem just a few days ago. I had exactly the same symptoms you describe.
EDIT: i didnt read your opening post well enough. It seems you already have tmpfs set.
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BillWho
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| Posted: Sun Dec 30, 2012 4:21 am Post subject: |
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tabanus,
wgetpaste dmesg and paste your fstab and menu.config or grub.cfg whichever one you're using.
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tabanus
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Joined: 11 Jun 2004
Posts: 577
Location: UK
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| Posted: Sun Dec 30, 2012 12:16 pm Post subject: |
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| duby2291 wrote: | Under psuedo-filesystems in menuconfig make sure tmpfs is checked. I already went through the rounds with that problem just a few days ago. I had exactly the same symptoms you describe.
EDIT: i didnt read your opening post well enough. It seems you already have tmpfs set. |
Yep saw your message thread
| BillWho wrote: | | wgetpaste dmesg and paste your fstab and menu.config or grub.cfg whichever one you're using. |
Kernel Config: http://pastebin.com/WKY02Pgq
dmesg: http://pastebin.com/KVpCwiwq
grub.conf:
| Code: | default 0
timeout 2
splashimage=(hd0,0)/grub/splash.xpm.gz
title=64bit Gentoo
root (hd0,0)
kernel /boot/bzImage root=/dev/sda1
title=32bit Gentoo.
root (hd0,0)
kernel /boot/bzImage-32 root=/dev/sdb2
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fstab:
| Code: | # <fs> <mountpoint> <type> <opts> <dump/pass>
UUID="58659a40-b6a5-42ab-b253-b2ee4d4cea84" /boot ext2 noauto,noatime 1 2
/dev/sda1 / ext4 noatime,data=writeback,discard 0 1
UUID="fa4a676a-b4e5-45bf-be7f-f29c9468b802" /mnt/DVD xfs noatime 0 2
/dev/sdb6 none swap sw 0 0
UUID="844e50aa-bf73-49e3-90c8-46737b5aa948" /home ext4 noatime 0 2
/home/.portage /usr/portage none bind 0 0
shm /dev/shm tmpfs nodev,nosuid,noexec 0 0
tmpfs /var/tmp/portage tmpfs size=3G 0 0 |
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gabrielg
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Joined: 16 Nov 2012
Posts: 74
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| Posted: Sun Dec 30, 2012 1:08 pm Post subject: |
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This one is suspicious, even though it doesn't hint to mounting anything read only:
| Code: |
EXT4-fs (sda1): Cannot change data mode on remount
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Did you try fiddling with your data mode in /etc/fstab?
It might not help, but I used to pass this to the kernel:
I cannot remember whether this was a genkernel requirement only though.
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BillWho
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| Posted: Sun Dec 30, 2012 2:21 pm Post subject: |
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tabanus,
To take the process of elimination approach, try just defaults or noatime for your root mount options in fstab.
According to man mount, sufficient testing hasn't yet been done for discard although that could be outdated.
Also you can append rootfstype=ext4 as gabrielg suggested.
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tabanus
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Joined: 11 Jun 2004
Posts: 577
Location: UK
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| Posted: Sun Dec 30, 2012 3:00 pm Post subject: |
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Thanks for the replies. Taking out data=writeback seems to have done the trick.
I think the difference with my old 32-bit install on this SSD is that I also did "tune2fs -o discard" to enable trim on the drive, and there appears to be some incompatibility with "data=writeback".
Not sure which I want most though, trim or no journalling.
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