static int do_mlockall(int flags)
{
int error;
unsigned int def_flags;
struct vm_area_struct * vma;
if (!capable(CAP_IPC_LOCK))
return -EPERM;
def_flags = 0;
if (flags & MCL_FUTURE)
def_flags = VM_LOCKED;
current->mm->def_flags = def_flags;
error = 0;
for (vma = current->mm->mmap; vma ; vma = vma->vm_next) {
unsigned int newflags;
newflags = vma->vm_flags | VM_LOCKED;
if (!(flags & MCL_CURRENT))
newflags &= ~VM_LOCKED;
/* Ignore errors */
mlock_fixup(vma, vma->vm_start, vma->vm_end, newflags);
}
return error;
}
static int do_mlock(unsigned long start, size_t len, int on)
{
unsigned long nstart, end, tmp;
struct vm_area_struct * vma, * next;
int error;
if (on && !capable(CAP_IPC_LOCK))
return -EPERM;
len = PAGE_ALIGN(len);
end = start + len;
if (end < start)
return -EINVAL;
if (end == start)
return 0;
vma = find_vma(current->mm, start);
if (!vma || vma->vm_start > start)
return -ENOMEM;
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;
if (vma->vm_end >= end) {
error = mlock_fixup(vma, nstart, end, newflags);
break;
}
tmp = vma->vm_end;
next = vma->vm_next;
error = mlock_fixup(vma, nstart, tmp, newflags);
if (error)
break;
nstart = tmp;
vma = next;
if (!vma || vma->vm_start != nstart) {
error = -ENOMEM;
break;
}
}
return error;
}
static int do_mlockall(int flags)
{
struct vm_area_struct * vma;
unsigned int def_flags = 0;
if (flags & MCL_FUTURE)
def_flags = VM_LOCKED;
current->mm->def_flags = def_flags;
if (flags == MCL_FUTURE)
goto out;
for (vma = current->mm->mmap; vma ; vma = vma->vm_next) {
unsigned int newflags;
newflags = vma->vm_flags | VM_LOCKED;
if (!(flags & MCL_CURRENT))
newflags &= ~VM_LOCKED;
/* Ignore errors */
mlock_fixup(vma, vma->vm_start, vma->vm_end, newflags);
}
out:
return 0;
}