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    SubjectRe: [RFC PATCH 1/2] fs: Add dirreadahead syscall and VFS hooks
    On Tue, Jul 29, 2014 at 10:21:50AM +0200, Michael Kerrisk wrote:
    > [CC+=linux-api]
    >
    > On Fri, Jul 25, 2014 at 7:37 PM, Abhi Das <adas@redhat.com> wrote:
    > > Also adds a void *opaque field to struct dir_context that can be
    > > used by filesystems to temporarily store any context as this
    > > struct gets passed around in the fs.

    So the prototype is:

    int dir_readahead(int fd, off64_t offset, unsigned int count);

    Why do we need a new syscall for this?

    $ man 2 readahead
    ....
    ssize_t readahead(int fd, off64_t offset, size_t count);
    ....
    EINVAL fd does not refer to a file type to which readahead() can be applied.


    Cheers,

    Dave.
    --
    Dave Chinner
    david@fromorbit.com


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