new locking scheme

[unix-history] / usr / src / sys / miscfs / union / union_vfsops.c

diff --git a/usr/src/sys/miscfs/union/union_vfsops.c b/usr/src/sys/miscfs/union/union_vfsops.c
index 2139392..0df9f55 100644 (file)
--- a/usr/src/sys/miscfs/union/union_vfsops.c
+++ b/usr/src/sys/miscfs/union/union_vfsops.c
@@ -8,7 +8,7 @@
  *
  * %sccs.include.redist.c%
  *
  *
  * %sccs.include.redist.c%
  *

- *     @(#)union_vfsops.c      1.9 (Berkeley) %G%
+ *     @(#)union_vfsops.c      2.1 (Berkeley) %G%

  */
 
 /*
  */
 
 /*


@@ -309,6 +309,7 @@ union_root(mp, vpp)
         * Return locked reference to root.
         */
        VREF(um->um_uppervp);
         * Return locked reference to root.
         */
        VREF(um->um_uppervp);

+       VOP_LOCK(um->um_uppervp);

        if (um->um_lowervp)
                VREF(um->um_lowervp);
        error = union_allocvp(vpp, mp,
        if (um->um_lowervp)
                VREF(um->um_lowervp);
        error = union_allocvp(vpp, mp,