linux-2.6.33/do_mlock()

参照元†

説明†

• パス: linux-2.6.33/mm/mlock.c

• FIXME: これは何？
  • 説明

引数†

• unsigned long start
• size_t len
• int on

返り値†

• int

参考†

実装†

static int do_mlock(unsigned long start, size_t len, int on)
{
	unsigned long nstart, end, tmp;
	struct vm_area_struct * vma, * prev;
	int error;

• • linux-2.6.33/vm_area_struct

	len = PAGE_ALIGN(len);
	end = start + len;
	if (end < start)
		return -EINVAL;
	if (end == start)
		return 0;

• • linux-2.6.33/PAGE_ALIGN()

	vma = find_vma_prev(current->mm, start, &prev);
	if (!vma || vma->vm_start > start)
		return -ENOMEM;

	if (start > vma->vm_start)
		prev = vma;

• • linux-2.6.33/find_vma_prev()

• linux-2.6.33/current(global)

	for (nstart = start ; ; ) {
		unsigned int newflags;

		/* Here we know that  vma->vm_start <= nstart < vma->vm_end. */

		newflags = vma->vm_flags | VM_LOCKED;
		if (!on)
			newflags &= ~VM_LOCKED;

• • linux-2.6.33/VM_LOCKED

		tmp = vma->vm_end;
		if (tmp > end)
			tmp = end;
		error = mlock_fixup(vma, &prev, nstart, tmp, newflags);
		if (error)
			break;

• • linux-2.6.33/mlock_fixup()

		nstart = tmp;
		if (nstart < prev->vm_end)
			nstart = prev->vm_end;
		if (nstart >= end)
			break;

		vma = prev->vm_next;
		if (!vma || vma->vm_start != nstart) {
			error = -ENOMEM;
			break;
		}
	}
	return error;
}

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• katsuhiro

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