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From: Rick Macklem <rmacklem@FreeBSD.org>
Date: Sat, 16 Apr 2011 22:15:59 +0000 (UTC)
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Subject: svn commit: r220731 - head/sys/fs/nfsclient
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Author: rmacklem
Date: Sat Apr 16 22:15:59 2011
New Revision: 220731
URL: http://svn.freebsd.org/changeset/base/220731

Log:
  Add mutex locking on the nfs node in ncl_inactive() for the
  experimental NFS client.
  
  MFC after:	2 weeks

Modified:
  head/sys/fs/nfsclient/nfs_clnode.c

Modified: head/sys/fs/nfsclient/nfs_clnode.c
==============================================================================
--- head/sys/fs/nfsclient/nfs_clnode.c	Sat Apr 16 16:20:51 2011	(r220730)
+++ head/sys/fs/nfsclient/nfs_clnode.c	Sat Apr 16 22:15:59 2011	(r220731)
@@ -202,12 +202,14 @@ ncl_inactive(struct vop_inactive_args *a
 		(void) nfsrpc_close(vp, 1, ap->a_td);
 	}
 
+	mtx_lock(&np->n_mtx);
 	if (vp->v_type != VDIR) {
 		sp = np->n_sillyrename;
 		np->n_sillyrename = NULL;
 	} else
 		sp = NULL;
 	if (sp) {
+		mtx_unlock(&np->n_mtx);
 		(void) ncl_vinvalbuf(vp, 0, ap->a_td, 1);
 		/*
 		 * Remove the silly file that was rename'd earlier
@@ -216,8 +218,10 @@ ncl_inactive(struct vop_inactive_args *a
 		crfree(sp->s_cred);
 		vrele(sp->s_dvp);
 		FREE((caddr_t)sp, M_NEWNFSREQ);
+		mtx_lock(&np->n_mtx);
 	}
 	np->n_flag &= NMODIFIED;
+	mtx_unlock(&np->n_mtx);
 	return (0);
 }