Hello, In linux-live scripts, I'm using aufs to join read-only branches with one writable branch at the top, so my setup is like the following:
/union := /mnt/changes (a rw branch) /mnt/images/br1 (a ro branch) /mnt/images/br2 (a ro branch) /mnt/images/br3 (a ro branch) /mnt/images/br4 (a ro branch) :: (xino path is somewhere else, in /mnt/xino/, not in the rw branch) During reboot, some processes which can't be killed (eg. init) are running from the union, (/union/sbin/init for example). My goal is to properly save all filesystem modifications in the writable branch. So first I tried to cleanly unmount the union, but it's busy and can't be unmounted. So, if the union can't be unmounted, I thought to remove the writable branch from it, using 'mount -o remount,del:/mnt/changes aufs /union'. Unfortunately this doesn't work either and there is no info in dmesg why that failed. I think aufs thinks the branch is busy. But I believe there are no more open files from the writable branch, so it shouldn't fail. Using lsof shows that only /union/dev/initctl is open, but /union/dev is overmounted by tmpfs, so the file is not in fact in the union, but somewhere else. Is there a possible way to find out what's wrong? How to debug why aufs doesn't want to delete the branch? Some kind of 'lsof' for aufs, which would show me what files are open on the given branch, or why the branch is busy. Thank you very much for any help. Tomas M ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/
