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    SubjectRe: [PATCH RFC 1/3] vfs: add copy_file_range syscall and vfs helper
    On 04/14/2015 12:53 PM, Christoph Hellwig wrote:
    > On Sat, Apr 11, 2015 at 09:04:02AM -0400, Jeff Layton wrote:
    >> Yuck! How the heck do you clean up the mess if that happens? I guess
    >> you're just stuck redoing the copy with normal READ/WRITE?
    >>
    >> Maybe we need to have the interface return a hard error in that
    >> case and not try to give back any sort of offset?
    >
    > The NFSv4.2 COPY interface is a train wreck. At least for Linux I'd
    > expect us to simply ignore it and only implement my new CLONE operation
    > with sane semantics. That is unless someone can show some real life
    > use case for the inter server copy, in which case we'll have to deal
    > with that mess. But getting that one right at the VFS level will
    > be a nightmare anyway.
    >
    > Make this a vote from me to not support partial copies and just return
    > and error in that case.

    Agreed. Looking at the v4.2 spec, COPY does take ca_consecutive and a ca_synchronous flags that let the client state if the copy should be done consecutively or synchronously. I expected to always set consecutive to "true" for the Linux client.

    Anna

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