I am using Gentoo Linux and for a while now, the root file system is mounted read-only on booting. For obvious reasons, this is quite annoying as most services do not start up correctly (I do not use a separate file system for /var). After the system is up, I have to log in, remount the root file system read-write, fix /etc/mtab, mount all other file systems in from /etc/fstab and then start up all the missing daemons. I know that there are ways to make a system run properly with a read-only file system, but I would rather restore the old behaviour of a writable root file system.
The strange thing is that after running
mount / -o remount,rw, the file system is mounted in writable mode without any errors. I suspected some problem with fsck, but now I have disabled automatic file system checks on the partition (
tune2fs -c0 -i0).
When I run dmesg, only these lines mention the partition at all, although I am not sure if not something gets lost because /var/log is not writable:
EXT3-fs (sda5): mounted filesystem with writeback data mode</code> EXT3-fs (sda5): using internal journal
The line in /etc/fstab looks like this:
/dev/sda5 / ext3 noatime 0 1
I am using the kernel 2.6.34-gentoo-r6 (the same problem existed with a previous 2.6.31 kernel). I have created it using genkernel 126.96.36.1996. My grub configuration looks like this:
title=Gentoo Linux (2.6.34-gentoo-r6) root (hd0,0) kernel /kernel-genkernel-x86_64-2.6.34-gentoo-r6 root=/dev/ram0 real_root=/dev/sda5 vga=792 CONSOLE=/dev/tty1 resume=/dev/sda6 initrd /initramfs-genkernel-x86_64-2.6.34-gentoo-r6
Apart from that, I run baselayout 2.0.0 with openrc 0.6.3, if that is any important. sysvinit 2.87-r3 is also installed, I don’t know if it’s actually used.
Here is the output of dumpe2fs:
Filesystem volume name: hd-root Last mounted on: <not available> Filesystem UUID: 387432ca-2464-4c61-ba15-11c4af1c0418 Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery sparse_super large_file Filesystem flags: signed_directory_hash Default mount options: (none) Filesystem state: clean Errors behavior: Continue Filesystem OS type: Linux Inode count: 1528912 Block count: 6104692 Reserved block count: 0 Free blocks: 413799 Free inodes: 674036 First block: 0 Block size: 4096 Fragment size: 4096 Reserved GDT blocks: 1022 Blocks per group: 32768 Fragments per group: 32768 Inodes per group: 8176 Inode blocks per group: 511 Filesystem created: Tue Dec 9 14:48:56 2008 Last mount time: Mon Sep 27 00:00:15 2010 Last write time: Sun Sep 26 23:55:12 2010 Mount count: 39 Maximum mount count: -1 Last checked: Sun Sep 26 23:51:51 2010 Check interval: 0 (<none>) Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 256 Journal inode: 8 First orphan inode: 698281 Default directory hash: tea Directory Hash Seed: 4229715b-4ad1-4285-940b-9960db1cb4e1 Journal backup: inode blocks Journal features: journal_incompat_revoke Journal size: 128M Journal length: 32768 Journal sequence: 0x003d9991 Journal start: 1
I have no idea what could cause this problem. I cannot find any error messages, and searching the internet, I only find manuals how to deliberately mount the root filesystem read-