Change the kernel's ucred API as follows:

- crhold() returns a reference to the ucred whose refcount it bumps.
- crcopy() now simply copies the credentials from one credential to
  another and has no return value.
- a new crshared() primitive is added which returns true if a ucred's
  refcount is > 1 and false (0) otherwise.

1 files changed, 2 insertions, 4 deletions

diff --git a/sys/kern/vfs_cluster.c b/sys/kern/vfs_cluster.c
index b685740..1960c28 100644
--- a/sys/kern/vfs_cluster.c
+++ b/sys/kern/vfs_cluster.c
@@ -774,10 +774,8 @@ cluster_wbuild(vp, size, start_lbn, len)
 		bp->b_op = tbp->b_op;
 		bp->b_bufsize = 0;
 		bp->b_npages = 0;
-		if (tbp->b_wcred != NOCRED) {
-		    bp->b_wcred = tbp->b_wcred;
-		    crhold(bp->b_wcred);
-		}
+		if (tbp->b_wcred != NOCRED)
+			bp->b_wcred = crhold(tbp->b_wcred);
 
 		bp->b_blkno = tbp->b_blkno;
 		bp->b_lblkno = tbp->b_lblkno;