Messages in this thread | | | From | devnull@spaans ... | Date | Wed, 13 Sep 2000 11:51:45 -0400 | Subject | Re: NFS locking bug -- limited mtime resolution means nfs_lock() does not provide coherency guarantee |
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Date: Wed, 13 Sep 2000 12:54:49 +0200 (CEST) From: Trond Myklebust <trond.myklebust@fys.uio.no>
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 timestamp.
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.)
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