device-dax: implement ->pagesize() for smaps to report MMUPageSize
Given that device-dax is making similar page mapping size guarantees as hugetlbfs, emit the size in smaps and any other kernel path that requests the mapping size of a vma. Link: http://lkml.kernel.org/r/151996255287.27922.18397777516059080245.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.com> Reported-by: Jane Chu <jane.chu@oracle.com> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -439,10 +439,20 @@ static int dev_dax_split(struct vm_area_struct *vma, unsigned long addr)
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return 0;
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}
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static unsigned long dev_dax_pagesize(struct vm_area_struct *vma)
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{
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struct file *filp = vma->vm_file;
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struct dev_dax *dev_dax = filp->private_data;
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struct dax_region *dax_region = dev_dax->region;
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return dax_region->align;
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}
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static const struct vm_operations_struct dax_vm_ops = {
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.fault = dev_dax_fault,
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.huge_fault = dev_dax_huge_fault,
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.split = dev_dax_split,
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.pagesize = dev_dax_pagesize,
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};
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static int dax_mmap(struct file *filp, struct vm_area_struct *vma)
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