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    SubjectRe: [PATCH 1/7] Introduce the pagetable_operations and associated helper macros.
    On Mon, Feb 19, 2007 at 10:31:34AM -0800, Adam Litke wrote:
    > Signed-off-by: Adam Litke <agl@us.ibm.com>
    > ---
    >
    > include/linux/mm.h | 25 +++++++++++++++++++++++++
    > 1 files changed, 25 insertions(+), 0 deletions(-)
    >
    > diff --git a/include/linux/mm.h b/include/linux/mm.h
    > index 2d2c08d..a2fa66d 100644
    > --- a/include/linux/mm.h
    > +++ b/include/linux/mm.h
    > @@ -98,6 +98,7 @@ struct vm_area_struct {
    >
    > /* Function pointers to deal with this struct. */
    > struct vm_operations_struct * vm_ops;
    > + struct pagetable_operations_struct * pagetable_ops;
    >
    > /* Information about our backing store: */
    > unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE
    > @@ -218,6 +219,30 @@ struct vm_operations_struct {
    > };
    >
    > struct mmu_gather;
    > +
    > +struct pagetable_operations_struct {
    > + int (*fault)(struct mm_struct *mm,
    > + struct vm_area_struct *vma,
    > + unsigned long address, int write_access);
    > + int (*copy_vma)(struct mm_struct *dst, struct mm_struct *src,
    > + struct vm_area_struct *vma);
    > + int (*pin_pages)(struct mm_struct *mm, struct vm_area_struct *vma,
    > + struct page **pages, struct vm_area_struct **vmas,
    > + unsigned long *position, int *length, int i);
    > + void (*change_protection)(struct vm_area_struct *vma,
    > + unsigned long address, unsigned long end, pgprot_t newprot);
    > + unsigned long (*unmap_page_range)(struct vm_area_struct *vma,
    > + unsigned long address, unsigned long end, long *zap_work);
    > + void (*free_pgtable_range)(struct mmu_gather **tlb,
    > + unsigned long addr, unsigned long end,
    > + unsigned long floor, unsigned long ceiling);
    > +};

    I don't think adding another operation vector is a good idea. But I'd
    rather extend the vma operations vector to deal with all nessecary
    buts ubstead if addubg a second one.

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