A new and improved version for the 2.3.40 kernel, and with a patch
for util-linux-2.10e:
ftp://icaftp.epfl.ch/pub/people/almesber/misc/umount-root-5.tar.gz
The main improvement here is that it can forcibly chroot processes
sitting on the root of a file system. This avoids all the problems
with kernel threads that don't CLONE_FS from init, daemonize(), or
exit_fs(). (Adding exit_fs is dangerous - e.g. my change to lockd
in umount-root-4 would probably have crashed lockd when forking a
reclaimer.)
In order to keep umount semantics sane, I've added two new flags.
A patch for the latest version of util-linux teaches umount the
new tricks. I've also added an option -x to keep umount(8) from
trying to be clever. (E.g. translating /dev/hda1 -> / or
attempting turn an umount into a remount. Both are very bad ideas
in this particular scenario.)
This is probably the last version before I send it to Linus. So
please give it a good beating.
- Werner
P.S. No, there's unfortunately no easy way to generalize this into
an umount -f that can get rid of arbitrary processes.
fuser -km is your friend ...
-- _________________________________________________________________________ / Werner Almesberger, ICA, EPFL, CH werner.almesberger@ica.epfl.ch / /_IN_N_032__Tel_+41_21_693_6621__Fax_+41_21_693_6610_____________________/- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/
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