2.4.1

 mm

diff -u --recursive --new-file v2.4.0/linux/mm/filemap.c linux/mm/filemap.c
--- v2.4.0/linux/mm/filemap.c   Tue Jan  2 18:59:45 2001
+++ linux/mm/filemap.c   Mon Jan 15 17:14:41 2001
@@ -143,7 +143,8 @@
    list_add(&page->list, &mapping->dirty_pages);
    spin_unlock(&pagecache_lock);
 
-   mark_inode_dirty_pages(mapping->host);
+   if (mapping->host)
+      mark_inode_dirty_pages(mapping->host);
 }
 
 /**
@@ -306,7 +307,7 @@
     */
    age_page_up(page);
    if (inactive_shortage() > inactive_target / 2 && free_shortage())
-         wakeup_kswapd(0);
+         wakeup_kswapd();
 not_found:
    return page;
 }
@@ -974,10 +975,6 @@
  *   accessed sequentially.
  */
    if (ahead) {
-      if (reada_ok == 2) {
-         run_task_queue(&tq_disk);
-      }
-
       filp->f_ralen += ahead;
       filp->f_rawin += filp->f_ralen;
       filp->f_raend = raend + ahead + 1;
@@ -1835,7 +1832,8 @@
    n->vm_end = end;
    setup_read_behavior(n, behavior);
    n->vm_raend = 0;
-   get_file(n->vm_file);
+   if (n->vm_file)
+      get_file(n->vm_file);
    if (n->vm_ops && n->vm_ops->open)
       n->vm_ops->open(n);
    lock_vma_mappings(vma);
@@ -1861,7 +1859,8 @@
    n->vm_pgoff += (n->vm_start - vma->vm_start) >> PAGE_SHIFT;
    setup_read_behavior(n, behavior);
    n->vm_raend = 0;
-   get_file(n->vm_file);
+   if (n->vm_file)
+      get_file(n->vm_file);
    if (n->vm_ops && n->vm_ops->open)
       n->vm_ops->open(n);
    lock_vma_mappings(vma);
@@ -1893,7 +1892,8 @@
    right->vm_pgoff += (right->vm_start - left->vm_start) >> PAGE_SHIFT;
    left->vm_raend = 0;
    right->vm_raend = 0;
-   atomic_add(2, &vma->vm_file->f_count);
+   if (vma->vm_file)
+      atomic_add(2, &vma->vm_file->f_count);
 
    if (vma->vm_ops && vma->vm_ops->open) {
       vma->vm_ops->open(left);