Messages in this thread | | | Subject | Re: [RFC 11/32] xfs: convert to struct inode_time | From | Roger Willcocks <> | Date | Mon, 02 Jun 2014 12:35:41 +0100 |
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On Mon, 2014-06-02 at 10:28 +1000, Dave Chinner wrote:
> > The 32 bit second counters in timestamps are too small to represent > time beyond the unix epoch (jan 2038) correctly. Extend the on-disk > format for a timestamp to include an 8-bit epoch counter so that we > can extend time for up to 255 Unix epochs. This should be good for > representing timestamps from 1970 to somewhere around 19,000 A.D.... >
I assume you're using an 'epoch' variable and not simply using the padding byte as an eight-bit prefix to the existing 32-bit counter because the existing counter is signed ?
For long term sanity it might make more sense for the eight-bit value to be a simple (sign-extended) prefix from 1970.
So if the feature bit is set it's a 40-bit signed time, which is good for 1970 +/- 17400 years or so.
-- Roger
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