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    SubjectRe: [PATCH v4 4/5] cramfs: add mmap support
    On Tue, 3 Oct 2017, Christoph Hellwig wrote:

    > On Tue, Oct 03, 2017 at 11:30:50AM -0400, Nicolas Pitre wrote:
    > > Unless you have a better scheme altogether to suggest of course, given
    > > the existing constraints.
    >
    > I still can't understand why this convoluted fault path that finds
    > vma, attempts with all kinds of races and then tries to update things
    > like vm_ops is even nessecary.
    >
    > We have direct mappings of physical address perfectly working in the
    > DAX code (even with write support!) or in drivers using remap_pfn_range
    > so a really good explanation why neither scheme can be used is needed
    > first.

    I provided that explanation several times by now in my cover letter. And
    separately even to you directly at least once. What else should I do?


    Nicolas

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