Hey all, i've recenty upgraded my diskless nfsroot systems from using
aufs1/2.6.27 to aufs2/2.6.31 (and 2.6.32). I'm having an issue with aufs2
that seems..well..strange.
System details:
=============
Netbooted diskless system, uses a readonly nfsroot and a rw tmpfs. System
root is setup via a custom init script (makes the tmpfs, overlays the tmpfs
ontop of the root fs with aufs, calls pivot_root ..pretty standard diskless
stuff), uses:
mktmpfs /mnt/ramdisk
mount -n -t aufs -o br:/mnt/ramdisk=rw:/=ro none /mnt/initrd
..as the aufs mount command. I'm using the gentoo package of aufs2-20100514
, which is based on aufs2-standalone iirc. i'm compiling with inotify
support but not with nfs-export support (i don't export nfs from the
diskless systems) and the kernel is being patched appropriately. dmesg
shows no errors or messages..
Important notes after bootup:
- original nfs mount for / is in /mnt/initrd/
- original tmpfs mount is in /mnt/initrd/mnt/ramdisk/
The Problem:
============
A few various directories within the filesystem are being erroneously
copied-up(?? i don't know the word for this) to the tmpfs for no apparent
reason and are virtually empty in comparison with the contents of the
nfsroot. Which directories these are seem to change every reboot..
Example:
Usually, if I say, want to try and recompile a kernel -- everything's fine
to begin with.
cd /usr/src/linux ; make oldconfig
After that completes, /mnt/initrd/mnt/ramdisk/usr/src/include/linux may
(usually but not always) exists and is usually empty or nearly empty. The
parent dir only holds a subdir 'linux'. This effectively nullifies
/usr/src/linux/include/linux which makes the next stage of compiling a
kernel rather difficult.
I can, however, rm -f /mnt/initrd/mnt/ramdisk/usr/src/include ..and then
everything's back to normal.
So, since I have no idea where to even start, any suggestions on mount
options to try or other methods to debug this?
Thanks,
Ian
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