Re: ext4 features

[Trond Myklebust]

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

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/