On Mon, 2017-01-23 at 18:38 +0100, hch wrote:
> On Mon, Jan 23, 2017 at 05:25:34PM +0000, Trond Myklebust wrote:
> > In that case the client will be required to continue to need to
> > send
> > mtime/ctime in order to ensure that we get the same historical
> > semantics w.r.t. ftruncate() vs truncate().
> >
> > IOW: It's not a question of the client being lazy about clearing
> > the
> > flags. It's a question of enforcing the correct semantics.
>
> No, the NFS spec requires the server to add an implicit mtime
> when the size actually changes. In fact the current code has a
> comment
> pointing to the section:
>
> * RFC5661, Section 18.30.4:
> * Changing the size of a file with SETATTR indirectly
> * changes the time_modify and change attributes.
> *
> * (and similar for the older RFCs)
>
> And yes, I've double checked that in the RFC.
Sure, but truncate() on POSIX adds the requirement that the mtime/ctime
should change even when the file size is not changed.
--
Trond Myklebust
Linux NFS client maintainer, PrimaryData
trond.myklebust@xxxxxxxxxxxxxxx
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