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    SubjectRe: [PATCH][RFC] splice support
    Andrew Morton wrote:

    >Linus Torvalds <torvalds@osdl.org> wrote:
    >
    >>Right now "flags" doesn't do anything at all, and you should just pass in
    >>zero.
    >>
    >
    >In that case perhaps we should be enforcing flags==0 so that future
    >flags-using applications will reliably fail on old flags-not-understanding
    >kernels.
    >
    >But that won't work if we later define a bit in flags to mean "behave like
    >old kernels used to". So perhaps we should require that bits 0-15 of
    >`flags' be zero and not care about bits 16-31.
    >
    >IOW: it might be best to make `flags' just go away, and add new syscalls in
    >the future as appropriate.
    >

    Well it is always going to transfer data from infd to outfd, isn't it?
    If something comes up that does not do that, then that should be a new
    syscall rather than a new flag.

    flags just modify the manner of the transfer I think. Things should still
    work if some flag is not supported, perhaps just not with optimal
    performance. That said, unsupported flags probably should fail, shouldn't
    they? The application / library could then retry with flags = 0.

    --

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