Remove some unnecessary actions by the zero-copy setup and teardown code.

Remove an incorrect comment.  (Incrementing an object's reference count
does not prevent a process from exiting.  The real concern here is that the
physical page must not be deleted until transmission is complete.  That is
already handled by the VM system and sf_buf_free().)

Tested by:	ken

1 files changed, 1 insertions, 10 deletions

diff --git a/sys/kern/uipc_cow.c b/sys/kern/uipc_cow.c
index 21701e0..dfe2c86 100644
--- a/sys/kern/uipc_cow.c
+++ b/sys/kern/uipc_cow.c
@@ -87,19 +87,15 @@ socow_iodone(void *addr, void *args)
 {	
 	int s;
 	struct sf_buf *sf;
-
-	vm_offset_t paddr; 
 	vm_page_t pp;
 
 	sf = dtosf(addr);
-	paddr = vtophys((vm_offset_t)addr);
-	pp = PHYS_TO_VM_PAGE(paddr);
+	pp = sf->m;
 	s = splvm();
 	/* remove COW mapping  */
 	vm_page_lock_queues();
 	vm_page_cowclear(pp);
 	vm_page_unlock_queues();
-	vm_object_deallocate(pp->object);
 	splx(s);
 	/* note that sf_buf_free() unwires the page for us*/
 	sf_buf_free(addr, NULL);
@@ -152,11 +148,6 @@ socow_setup(struct mbuf *m0, struct uio *uio)
 	vm_page_wire(pp);
 	vm_page_unlock_queues();
 
-	/*
-	 * prevent the process from exiting on us.
-	 */
-	vm_object_reference(pp->object);
-
 	/* 
 	 * attach to mbuf
 	 */