Author: kib
Date: Thu Jan 10 18:24:48 2013
New Revision: 245262
URL: http://svnweb.freebsd.org/changeset/base/245262
Log:
When nullfs mount is forcibly unmounted and nullfs vnode is reclaimed,
get back the leased write reference from the lower vnode. There is no
other path which can correct v_writecount on the lowervp.
Reported by: flo
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Modified:
head/sys/fs/nullfs/null_vnops.c
Modified: head/sys/fs/nullfs/null_vnops.c
==============================================================================
--- head/sys/fs/nullfs/null_vnops.c Thu Jan 10 18:04:42 2013
(r245261)
+++ head/sys/fs/nullfs/null_vnops.c Thu Jan 10 18:24:48 2013
(r245262)
@@ -740,6 +740,14 @@ null_reclaim(struct vop_reclaim_args *ap
vp->v_object = NULL;
vp->v_vnlock = &vp->v_lock;
VI_UNLOCK(vp);
+
+ /*
+ * If we were opened for write, we leased one write reference
+ * to the lower vnode. If this is a reclamation due to the
+ * forced unmount, undo the reference now.
+ */
+ if (vp->v_writecount > 0)
+ VOP_ADD_WRITECOUNT(lowervp, -1);
vput(lowervp);
free(xp, M_NULLFSNODE);
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