Messages in this thread | | | Subject | Re: ext4 features | From | Trond Myklebust <> | Date | Wed, 05 Jul 2006 15:33:53 -0400 |
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On Wed, 2006-07-05 at 08:59 -0400, J. Bruce Fields wrote: > On Wed, Jul 05, 2006 at 08:24:29AM -0400, Bill Davidsen wrote: > > Theodore Tso wrote: > > >Some of the ideas which have been tossed about include: > > > > > > * nanosecond timestamps, and support for time beyond the 2038 > > > > The 2nd one is probably more urgent than the first. I can see a general > > benefit from timestamp in ms, beyond that seems to be a specialty > > requirement best provided at the application level rather than the bits > > of a trillion inodes which need no such thing. > > What's urgently needed for NFS (and I suspect for most other > applications demanding higher timestamps) isn't really nanosecond > precision so much as something that's guaranteed to increase whenever > the file changes.
NFS doesn't necessarily require monotonicity either. The only real requirement that knfsd has is that the timestamp needs to change every time the file data (mtime+ctime) and/or metadata (ctime only) is changed.
Applications like 'make' OTOH, probably would be happier if the timestamps are guaranteed to be monotonic.
Cheers, Trond
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