Re: Supporting FALLOC_FL_WRITE_ZEROES in NFS4.2 with WRITE_SAME?

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On Tue, Mar 18, 2025 at 2:17 PM Trond Myklebust <trondmy@xxxxxxxxxxxxxxx> wrote:
>
> On Tue, 2025-03-18 at 14:03 -0700, Rick Macklem wrote:
> >
> > The problem I see is that WRITE_SAME isn't defined in a way where the
> > NFSv4 server can only implement zero'ng and fail the rest.
> > As such. I am thinking that a new operation for NFSv4.2 that does
> > writing
> > of zeros might be preferable to trying to (mis)use WROTE_SAME.
>
> Why wouldn't you just implement DEALLOCATE?
Not my area of expertise, but I believe some like to know that
zeros have overwritten the data instead of the data just being unallocated
(blocks still sitting around with the data in it).

rick

>
> --
> Trond Myklebust
> Linux NFS client maintainer, Hammerspace
> trond.myklebust@xxxxxxxxxxxxxxx
>
>





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