--- mm/mincore.c.old	2007-03-24 19:55:01.000000000 -0500
+++ mm/mincore.c	2007-03-24 20:13:43.000000000 -0500
@@ -43,7 +43,8 @@
  * all the arguments, we hold the mmap semaphore: we should
  * just return the amount of info we're asked for.
  */
-static long do_mincore(unsigned long addr, unsigned char *vec, unsigned long pages)
+static long do_mincore(unsigned long addr, unsigned char *vec, unsigned long pages,
+        struct file** file_struct)
 {
 	unsigned long i, nr, pgoff;
 	struct vm_area_struct *vma = find_vma(current->mm, addr);
@@ -64,7 +65,19 @@
 	 * this is what we've traditionally done, so we'll just
 	 * continue doing it.
 	 */
-	if (!vma->vm_file)
+
+    /* 
+     * Initialize file pointer to the value in the first vma structure
+     */
+
+    if ( *file_struct == NULL && vma->vm_file )
+        *file_struct = vma->vm_file;
+
+    /*
+     * Return an error if the is no file mapped of the file is different
+     */
+ 
+	if (!vma->vm_file || vma->vm_file != *file_struct)
 		return -ENOMEM;
 
 	/*
@@ -115,6 +128,7 @@
 	long retval;
 	unsigned long pages;
 	unsigned char *tmp;
+    static struct file* file = NULL;
 
 	/* Check the start address: needs to be page-aligned.. */
  	if (start & ~PAGE_CACHE_MASK)
@@ -142,7 +156,7 @@
 		 * the temporary buffer size.
 		 */
 		down_read(&current->mm->mmap_sem);
-		retval = do_mincore(start, tmp, min(pages, PAGE_SIZE));
+		retval = do_mincore(start, tmp, min(pages, PAGE_SIZE), &file);
 		up_read(&current->mm->mmap_sem);
 
 		if (retval <= 0)