[arch-general] Mounted ext4 filesystem without journal

[Alexander Kapshuk]

Most probably due to a buggy custom kernel, fsck on /dev/sda2, i.e the
root partition, failed with a rootfs prompt and an invitation to run
fsck on /dev/sda2 presented.
On having done that and rebooted, when performing fsck on /dev/sda2,
the system reported that:
/dev/sda2 had not been cleanly unmounted
0.4% non-contiguous blocks
mounting /dev/sda2 on real root
EXT4-fs (sda2) mounted filesystem without journal
Root device mounted successfully, but /sbin/init does not exist.

The wiki article on fsck troubleshooting,
https://wiki.archlinux.org/index.php/Fsck#Troubleshooting, suggests
using tune2fs to write a new journal to /dev/sda2.
But it doesn't seem to be available when in rootfs.

Booting into the Arch Linux installation CD and mounting /dev/sda2
over /mnt reveals lost+found as the sole contents of the directory.
As an experiment, mounting /dev/sda1 over /mnt confirms the presence
of all the files there are on my boot partition.

Any pointers on how to proceed with this would be much appreciated.