check that mount structures are empty before deleteing them

SCCS-vsn: sys/kern/vfs_syscalls.c 7.77

diff --git a/usr/src/sys/kern/vfs_syscalls.c b/usr/src/sys/kern/vfs_syscalls.c
index 9f40c9a..54f2850 100644 (file)
--- a/usr/src/sys/kern/vfs_syscalls.c
+++ b/usr/src/sys/kern/vfs_syscalls.c
@@ -4,7 +4,7 @@
  *
  * %sccs.include.redist.c%
  *
  *
  * %sccs.include.redist.c%
  *

- *     @(#)vfs_syscalls.c      7.76 (Berkeley) %G%
+ *     @(#)vfs_syscalls.c      7.77 (Berkeley) %G%

  */
 
 #include "param.h"
  */
 
 #include "param.h"


@@ -250,6 +250,8 @@ dounmount(mp, flags, p)
        } else {
                vrele(coveredvp);
                vfs_remove(mp);
        } else {
                vrele(coveredvp);
                vfs_remove(mp);

+               if (mp->mnt_mounth != NULL)
+                       panic("unmount: dangling vnode");

                free((caddr_t)mp, M_MOUNT);
        }
        return (error);
                free((caddr_t)mp, M_MOUNT);
        }
        return (error);