Messages in this thread | | | From | "Lever, Charles" <> | Subject | RE: tmpfs, NFS, file handles | Date | Thu, 21 Feb 2002 08:16:04 -0800 |
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> That means you are only hashing inodes exported by NFS, and you have > a pretty good guarantee of uniqueness (providing time doesn't go > backwards).
this may be obvious... apologies.
don't use the TOD directly -- it can go backwards if ntpd or an admin sets it back. better to use a monotonically increasing number that you completely control yourself.
also, if your timer resolution isn't good enough, a window opens where two generated "uniquifiers" can be the same for all intents and purposes.
if there's nothing else we've learned from NFS, it's that using timestamps is a lousy way of managing cache coherency and file identity. ;-) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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