diff options
| -rw-r--r-- | sys/include/vm/obj.h | 8 | ||||
| -rw-r--r-- | sys/vm/vm_obj.c | 5 |
2 files changed, 13 insertions, 0 deletions
diff --git a/sys/include/vm/obj.h b/sys/include/vm/obj.h index 6129889..c1c2f17 100644 --- a/sys/include/vm/obj.h +++ b/sys/include/vm/obj.h @@ -42,9 +42,17 @@ struct vm_object { struct vm_pagerops *pgops; /* Pager operations */ uint8_t is_anon : 1; /* Is an anonymous mapping */ + int ref; /* Ref count */ struct vnode *vnode; /* Only used if `is_anon` is 0 */ }; +#define vm_object_ref(OBJPTR) (++(OBJPTR)->ref) +#define vm_object_unref(OBJPTR) do { \ + if ((OBJPTR)->ref > 1) { \ + --(OBJPTR)->ref; \ + } \ + } while (0); + int vm_obj_init(struct vm_object **res, struct vnode *vnode); int vm_obj_destroy(struct vm_object *obj); diff --git a/sys/vm/vm_obj.c b/sys/vm/vm_obj.c index 589ca47..7487b47 100644 --- a/sys/vm/vm_obj.c +++ b/sys/vm/vm_obj.c @@ -59,6 +59,7 @@ vm_obj_init(struct vm_object **res, struct vnode *vnode) memset(obj, 0, sizeof(struct vm_object)); obj->vnode = vnode; + obj->ref = 1; vm_set_pgops(obj, vnode); *res = obj; @@ -73,6 +74,10 @@ vm_obj_destroy(struct vm_object *obj) if (vp->vmobj != NULL) vp->vmobj = NULL; + /* Check the ref count */ + if (obj->ref > 1) + return -EBUSY; + dynfree(obj); return 0; } |