nullfs on 5.1
tjr at freebsd.org
Fri Jan 9 01:35:52 PST 2004
Florian Weimer wrote:
>I'm trying to use nullfs on FreeBSD 5.1, and run into deadlocks in quite
>simple situations (chroot to tree that contains an alias mount, read
>access to the mounted tree -- no recursive/loop mounts). Processes get
>stuck and hang forever in D state (holding a UFS log according to ps).
One major potential deadlock has been fixed since the release of 5.1. If
you find a reproducible way of deadlocking nullfs on 5.2 or a -current
snapshot less than 6 months old, submit a bug report.
>Is nullfs essentially unsuported, or is it just broken? What's the
>status of unionfs (the manpage is rather discouraging).
Nullfs is unsupported, but works well except for a few outstanding bugs
(e.g. accessing some kinds of special files on the lower layer through
the upper layer causes a panic). Similarly for unionfs. Umapfs is broken
and should be avoided.
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