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    SubjectRe: Interface for the new fallocate() system call
    On Fri, Mar 30, 2007 at 02:14:17AM -0500, Jakub Jelinek wrote:
    > Wouldn't
    > int fallocate(loff_t offset, loff_t len, int fd, int mode)
    > work on both s390 and ppc/arm? glibc will certainly wrap it and
    > reorder the arguments as needed, so there is no need to keep fd first.

    This should work on all the platforms. The only concern I can think of
    here is the convention being followed till now, where all the entities on
    which the action has to be performed by the kernel (say fd, file/device
    name, pid etc.) is the first argument of the system call. If we can live
    with the small exception here, fine.

    Or else, we may have to implement the

    int fd, int mode, loff_t offset, loff_t len

    as the layout of arguments here. I think only s390 will have a problem
    with this, and we can think of a workaround for it (may be similar to
    what ARM did to implement sync_file_range() system call) :

    asmlinkage long sys_s390_fallocate(int fd, loff_t offset, loff_t len, int mode)
    return sys_fallocate(fd, offset, len, mode);

    To me both the approaches look slightly unconventional. But, we need to
    compromise somewhere to make things work on all the platforms.

    Any thoughts on which one of the above should we finalize on ?

    Amit Arora
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