svn commit: r341281 - head/sys/vm
Eric van Gyzen
vangyzen at FreeBSD.org
Fri Nov 30 04:18:32 UTC 2018
Author: vangyzen
Date: Fri Nov 30 04:18:31 2018
New Revision: 341281
URL: https://svnweb.freebsd.org/changeset/base/341281
Log:
Add assertions and comment to vm_object_vnode()
Reviewed by: kib
MFC after: 2 weeks
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D2724
Modified:
head/sys/vm/vm_object.c
Modified: head/sys/vm/vm_object.c
==============================================================================
--- head/sys/vm/vm_object.c Fri Nov 30 04:15:56 2018 (r341280)
+++ head/sys/vm/vm_object.c Fri Nov 30 04:18:31 2018 (r341281)
@@ -2306,16 +2306,28 @@ next_page:
}
}
+/*
+ * Return the vnode for the given object, or NULL if none exists.
+ * For tmpfs objects, the function may return NULL if there is
+ * no vnode allocated at the time of the call.
+ */
struct vnode *
vm_object_vnode(vm_object_t object)
{
+ struct vnode *vp;
VM_OBJECT_ASSERT_LOCKED(object);
- if (object->type == OBJT_VNODE)
- return (object->handle);
- if (object->type == OBJT_SWAP && (object->flags & OBJ_TMPFS) != 0)
- return (object->un_pager.swp.swp_tmpfs);
- return (NULL);
+ if (object->type == OBJT_VNODE) {
+ vp = object->handle;
+ KASSERT(vp != NULL, ("%s: OBJT_VNODE has no vnode", __func__));
+ } else if (object->type == OBJT_SWAP &&
+ (object->flags & OBJ_TMPFS) != 0) {
+ vp = object->un_pager.swp.swp_tmpfs;
+ KASSERT(vp != NULL, ("%s: OBJT_TMPFS has no vnode", __func__));
+ } else {
+ vp = NULL;
+ }
+ return (vp);
}
static int
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