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    SubjectRe: [git patches] xfs and block fixes for virtually indexed arches
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    On Fri, 18 Dec 2009 13:44:40 +1100
    Dave Chinner <david@fromorbit.com> wrote:

    > > > So it sounds like we only need a blk_rq_map_vmalloc() using the same
    > > > techniques as the patch set and we're good to go.
    > >
    > > I'm not sure about it.
    > >
    > > As I said before (when I was against this 'adding vmalloc support to
    > > the block layer' stuff), are there potential users of this except for
    > > XFS? Are there anyone who does such a thing now?
    >
    > As Christoph already mentioned, XFS is not passing the vmalloc'd
    > range to the block layer

    Oops, I should have said a vmalloc/vmap area.


    > > This API might be useful for only journaling file systems using log
    > > formats that need large contiguous buffer. Sound like only XFS?
    >
    > FWIW, mapped buffers larger than PAGE_SIZE are used for more than just log
    > recovery in XFS. e.g. filesystems with directory block size larger
    > than page size uses mapped buffers.

    I see, thanks.


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