- Replace v_flag with v_iflag and v_vflag

 - v_vflag is protected by the vnode lock and is used when synchronization
   with VOP calls is needed.
 - v_iflag is protected by interlock and is used for dealing with vnode
   management issues.  These flags include X/O LOCK, FREE, DOOMED, etc.
 - All accesses to v_iflag and v_vflag have either been locked or marked with
   mp_fixme's.
 - Many ASSERT_VOP_LOCKED calls have been added where the locking was not
   clear.
 - Many functions in vfs_subr.c were restructured to provide for stronger
   locking.

Idea stolen from:	BSD/OS

1 files changed, 5 insertions, 1 deletions

diff --git a/sys/fs/nwfs/nwfs_io.c b/sys/fs/nwfs/nwfs_io.c
index 9c7d5fa1e85d..ffcef2afba3f 100644
--- a/sys/fs/nwfs/nwfs_io.c
+++ b/sys/fs/nwfs/nwfs_io.c
@@ -599,9 +599,13 @@ nwfs_vinvalbuf(vp, flags, cred, td, intrflg)
 /*	struct nwmount *nmp = VTONWFS(vp);*/
 	int error = 0, slpflag, slptimeo;
 
-	if (vp->v_flag & VXLOCK) {
+	VI_LOCK(vp);
+	if (vp->v_iflag & VI_XLOCK) {
+		VI_UNLOCK(vp);
 		return (0);
 	}
+	VI_UNLOCK(vp);
+
 	if (intrflg) {
 		slpflag = PCATCH;
 		slptimeo = 2 * hz;