#include <linux/syscalls.h>
#include <linux/mempolicy.h>
#include <linux/hugetlb.h>
+#include <linux/sched.h>
/*
* Any behaviour which results in changes to the vma->vm_flags needs to
if (!file)
return -EBADF;
- if (file->f_mapping->a_ops->get_xip_page) {
+ if (file->f_mapping->a_ops->get_xip_mem) {
/* no bad return value, but ignore advice */
return 0;
}
end = vma->vm_end;
end = ((end - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
- force_page_cache_readahead(file->f_mapping,
- file, start, max_sane_readahead(end - start));
+ force_page_cache_readahead(file->f_mapping, file, start, end - start);
return 0;
}
* Application no longer needs these pages. If the pages are dirty,
* it's OK to just throw them away. The app will be more careful about
* data it wants to keep. Be sure to free swap resources too. The
- * zap_page_range call sets things up for refill_inactive to actually free
+ * zap_page_range call sets things up for shrink_active_list to actually free
* these pages later if no one else has touched them in the meantime,
* although we could add these pages to a global reuse list for
- * refill_inactive to pick up before reclaiming other pages.
+ * shrink_active_list to pick up before reclaiming other pages.
*
* NB: This interface discards data rather than pushes it out to swap,
* as some implementations do. This has performance implications for
break;
default:
- error = -EINVAL;
+ BUG();
break;
}
return error;
}
+static int
+madvise_behavior_valid(int behavior)
+{
+ switch (behavior) {
+ case MADV_DOFORK:
+ case MADV_DONTFORK:
+ case MADV_NORMAL:
+ case MADV_SEQUENTIAL:
+ case MADV_RANDOM:
+ case MADV_REMOVE:
+ case MADV_WILLNEED:
+ case MADV_DONTNEED:
+ return 1;
+
+ default:
+ return 0;
+ }
+}
/*
* The madvise(2) system call.
*
* -EBADF - map exists, but area maps something that isn't a file.
* -EAGAIN - a kernel resource was temporarily unavailable.
*/
-asmlinkage long sys_madvise(unsigned long start, size_t len_in, int behavior)
+SYSCALL_DEFINE3(madvise, unsigned long, start, size_t, len_in, int, behavior)
{
unsigned long end, tmp;
struct vm_area_struct * vma, *prev;
int unmapped_error = 0;
int error = -EINVAL;
+ int write;
size_t len;
- if (madvise_need_mmap_write(behavior))
+ if (!madvise_behavior_valid(behavior))
+ return error;
+
+ write = madvise_need_mmap_write(behavior);
+ if (write)
down_write(¤t->mm->mmap_sem);
else
down_read(¤t->mm->mmap_sem);
vma = find_vma(current->mm, start);
}
out:
- if (madvise_need_mmap_write(behavior))
+ if (write)
up_write(¤t->mm->mmap_sem);
else
up_read(¤t->mm->mmap_sem);