Re: [NFS] Cache flushing

[Timo Sirainen <tss@iki.fi>]

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On Sun, 2007-11-18 at 00:11 +0200, Timo Sirainen wrote:
> > Why can't you simply close(), and then re-open() the file? That is _the_
> > standard way to force an attribute cache revalidation on all NFS
> > versions. The close-to-open caching model, which is implemented on most
> > NFS clients guarantees this.
..
> close()+open() would have been difficult to handle because open() can
> fail, but looks like opening another file descriptor and closing it
> works just as well. Also looks like it works for flushing directories'
> attribute cache (which doesn't seem to work with FreeBSD though).

Actually it works for flushing a directory's attribute cache in
v2.6.17-rc2, but not in v2.6.22. chown() works in v2.6.22 also. Is there
a reason for this change? I guess it anyway means that I'm back to using
chown() for flushing a directory's attribute cache.

The reason for flushing a directory's attribute cache is so that I can
see with stat() if an open file under it has been replaced (if its inode
has changed).

http://dovecot.org/tools/nfstest.c can be used to easily test what works
and what doesn't for cache flushes.


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