How to retrieve page pointer from vm_area_struct?

How to retrieve page pointer from vm_area_struct?

[Park Chan ho]

Hi all,
I want to retrieve "struct page" pointer from vm_area_struct.
How do I write code below example?

------------example code------------
struct task_struct *p;
struct vm_area_struct *vma;
struct page *page;

for_each_process(p) {
    if (!p->mm) continue;
    for (vma = p->mm->mmap; vma; vma = vma->vm_next) {
       for (i = vma->vm_start; i < vma->vm_end; i += PAGE_SIZE) {
            /* How to get page pointer? */
            page = ???
       }
    }
}

How to retrieve page pointer from vm_area_struct?

[Rajat Sharma]

use get_user_pages, this function works on vma and pin pages in memory
as well, typically used by filesystem Direct I/O implementation.

Thanks,
Rajat

On Sun, Apr 17, 2011 at 9:34 AM, Park Chan ho <parkch98@gmail.com> wrote:
> Hi all,
> I want to retrieve "struct page" pointer from vm_area_struct.
> How do I write code below example?
>
> ------------example code------------
> struct task_struct *p;
> struct vm_area_struct *vma;
> struct page *page;
>
> for_each_process(p) {
> ? ?if (!p->mm) continue;
> ? ?for (vma = p->mm->mmap; vma; vma = vma->vm_next) {
> ? ? ? for (i = vma->vm_start; i < vma->vm_end; i += PAGE_SIZE) {
> ? ? ? ? ? ?/* How to get page pointer? */
> ? ? ? ? ? ?page = ???
> ? ? ? }
> ? ?}
> }
>
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