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Don't attempt to reverse collapse non OBJ_INTERNAL objects.

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This commit is contained in:
David Greenman 1995-03-07 17:25:46 +00:00
parent 05048ea000
commit be6d5bfac7
1 changed files with 19 additions and 6 deletions
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25
sys/vm/vm_object.c
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@ -61,7 +61,7 @@
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*
* $Id: vm_object.c,v 1.27 1995/02/22 10:00:16 davidg Exp $
* $Id: vm_object.c,v 1.28 1995/03/01 23:29:57 davidg Exp $
*/
/*
@ -259,11 +259,16 @@ vm_object_deallocate(object)
* Lose the reference
*/
vm_object_lock(object);
if (--(object->ref_count) != 0) {
if (object->ref_count == 1) {
object->ref_count--;
if (object->ref_count != 0) {
if ((object->ref_count == 1) &&
(object->flags & OBJ_INTERNAL)) {
vm_object_t robject;
robject = object->reverse_shadow_head.tqh_first;
if( robject) {
if ((robject != NULL) &&
(robject->flags & OBJ_INTERNAL)) {
int s;
robject->ref_count += 2;
object->ref_count += 2;
@ -313,6 +318,12 @@ vm_object_deallocate(object)
*/
if ((object->flags & OBJ_CANPERSIST) &&
(object->resident_page_count != 0)) {
vm_pager_t pager = object->pager;
vn_pager_t vnp = (vn_pager_t) pager->pg_data;
if (pager->pg_type == PG_VNODE) {
vnp->vnp_vp->v_flag &= ~VTEXT;
}
TAILQ_INSERT_TAIL(&vm_object_cached_list, object,
cached_list);
@ -363,10 +374,10 @@ vm_object_terminate(object)
vm_object_lock(shadow_object);
if (shadow_object->copy == object)
shadow_object->copy = NULL;
/*
#if 0
else if (shadow_object->copy != NULL)
panic("vm_object_terminate: copy/shadow inconsistency");
*/
#endif
vm_object_unlock(shadow_object);
}
if (object->pager && (object->pager->pg_type == PG_VNODE)) {
@ -442,6 +453,8 @@ vm_object_terminate(object)
while ((p = object->memq.tqh_first) != NULL) {
VM_PAGE_CHECK(p);
vm_page_lock_queues();
if (p->flags & PG_BUSY)
printf("vm_object_terminate: freeing busy page\n");
PAGE_WAKEUP(p);
vm_page_free(p);
cnt.v_pfree++;