Re: minor patch for 2.1.111 fs/open.c

Bill Hawes (
Tue, 28 Jul 1998 20:16:30 -0700

Richard Gooch wrote:

> Could this possibly be related to an ongoing problem I've observed
> with corrupted /etc/mtab files? As you know, mount(8) creates
> /etc/mtab~ with O_EXCL for locking purposes. I have noticed for a long
> time now that sometimes (say when stopping automount daemons) that
> /etc/mtab gets corrupted. I've looked at the mount(8) code and it
> appears to be doing the correct thing. It may be that there is a race
> condition with open(2) and O_EXCL (I have an SMP machine).

I think the stale dentry problem would be very rare, as it requires a failed
open and a dput() that blocks long enough for some other task to try to walk
the inuse filps list.

OTOH, checking to remount r/o is one of the cases that has to use the inuse
filps list, and this could be related to something with /etc/mtab.


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