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SubjectRe: NFS locking bug -- limited mtime resolution means nfs_lock() does not provide coherency guarantee
   Date: 	Wed, 13 Sep 2000 12:54:49 +0200 (CEST)
From: Trond Myklebust <>

Don't forget that 2^20 > 10^6, hence if you really want units of
microseconds, you actually only need to save 3 bytes worth of data per

For the purposes of NFS, however the 'microseconds' field doesn't
actually have to mean anything. It's just used as a cookie.
Furthermore, only the mtime field, and to a limited extent the ctime
field, are used for attribute consistency checking.

So this is a really stupid question, but I'll ask it anyway. If you
just need a cookie, is there any way that you might be able to steal a
few bits from i_generation field for that purpose? (This assumes that
we only worry about solving the problem for NFS.)

- Ted
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