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#define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)

/*

 * These are the virtual MM functions - opening of an area, closing and

 * unmapping it (needed to keep files on disk up-to-date etc), pointer

 * to the functions called when a no-page or a wp-page exception occurs. 

 */

struct vm_operations_struct {

	void (*open)(struct vm_area_struct * area);

	void (*close)(struct vm_area_struct * area);

	int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);

	/* notification that a previously read-only page is about to become

	 * writable, if an error is returned it will cause a SIGBUS */

	int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf);

	/* called by access_process_vm when get_user_pages() fails, typically

	 * for use by special VMAs that can switch between memory and hardware

	 */

	int (*access)(struct vm_area_struct *vma, unsigned long addr,

		      void *buf, int len, int write);

#ifdef CONFIG_NUMA

	/*

	 * set_policy() op must add a reference to any non-NULL @new mempolicy

	 * to hold the policy upon return.  Caller should pass NULL @new to

	 * remove a policy and fall back to surrounding context--i.e. do not

	 * install a MPOL_DEFAULT policy, nor the task or system default

	 * mempolicy.

	 */

	int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new);

	/*

	 * get_policy() op must add reference [mpol_get()] to any policy at

	 * (vma,addr) marked as MPOL_SHARED.  The shared policy infrastructure

	 * in mm/mempolicy.c will do this automatically.

	 * get_policy() must NOT add a ref if the policy at (vma,addr) is not

	 * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.

	 * If no [shared/vma] mempolicy exists at the addr, get_policy() op

	 * must return NULL--i.e., do not "fallback" to task or system default

	 * policy.

	 */

	struct mempolicy *(*get_policy)(struct vm_area_struct *vma,

					unsigned long addr);

	int (*migrate)(struct vm_area_struct *vma, const nodemask_t *from,

		const nodemask_t *to, unsigned long flags);

#endif

	/* called by sys_remap_file_pages() to populate non-linear mapping */

	int (*remap_pages)(struct vm_area_struct *vma, unsigned long addr,