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Split vmas had no objects. Now fixed.

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When sys_munmap() splits a vma, the new vma had no copy of the objects
in the original vma. Now we fixed that using a vma_copy_links() function
which can also be used as part of fork().
This commit is contained in:
Bahadir Balban
2008-11-07 20:39:11 +02:00
parent 61751a896b
commit daffc1d084
4 changed files with 37 additions and 19 deletions
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20
tasks/mm0/src/task.c
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@@ -129,7 +129,6 @@ int tcb_destroy(struct tcb *task)
int copy_vmas(struct tcb *to, struct tcb *from)
{
struct vm_area *vma, *new_vma;
struct vm_obj_link *vmo_link, *new_link;
list_for_each_entry(vma, &from->vm_area_head->list, list) {
@@ -137,23 +136,8 @@ int copy_vmas(struct tcb *to, struct tcb *from)
new_vma = vma_new(vma->pfn_start, vma->pfn_end - vma->pfn_start,
vma->flags, vma->file_offset);
/* Get the first object on the vma */
BUG_ON(list_empty(&vma->vm_obj_list));
vmo_link = list_entry(vma->vm_obj_list.next,
struct vm_obj_link, list);
do {
/* Create a new link */
new_link = vm_objlink_create();
/* Link object with new link */
vm_link_object(new_link, vmo_link->obj);
/* Add the new link to vma in object order */
list_add_tail(&new_link->list, &new_vma->vm_obj_list);
/* Continue traversing links, doing the same copying */
} while((vmo_link = vma_next_link(&vmo_link->list,
&vma->vm_obj_list)));
/* Copy all object links */
vma_copy_links(new_vma, vma);
/* All link copying is finished, now add the new vma to task */
task_add_vma(to, new_vma);