[PATCH 1/7] Introduce the pagetable_operations and associated helper macros.

[Adam Litke <agl@us.ibm.com>]

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 60e0e4a..7089323 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;
+	const 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);
+};
+
+#define has_pt_op(vma, op) \
+	((vma)->pagetable_ops && (vma)->pagetable_ops->op)
+#define pt_op(vma, call) \
+	((vma)->pagetable_ops->call)
+
 struct inode;
 
 #define page_private(page)		((page)->private)