Re: [LSF/MM/BPF TOPIC] Implementing the NFS v4.2 WRITE_SAME operation: VFS or NFS ioctl() ?

[Christoph Hellwig <hch@infradead.org>]

On Tue, Jan 14, 2025 at 04:38:03PM -0500, Anna Schumaker wrote:
> I've seen a few requests for implementing the NFS v4.2 WRITE_SAME [1] operation over the last few months [2][3] to accelerate writing patterns of data on the server, so it's been in the back of my mind for a future project. I'll need to write some code somewhere so NFS & NFSD can handle this request. I could keep any implementation internal to NFS / NFSD, but I'd like to find out if local filesystems would find this sort of feature useful and if I should put it in the VFS instead.

Well, one actual not very detailed request, and one question from a poster
who just asks random questions on the list all the time for no good reason.

If you care about it prototype first, check is feasible and see if it
gives the expected results.  After that you can report back with the
findings and have an architectural discussion.  But unless that gets
stuck you should be easily do that on the list instead of wasting
meetings slots on hand wavy stuff.