vfs: add helper table to convert from mode_t to vnode type

fs/vfs/vfs_vnode.c

@@ -43,6 +43,12 @@
 #include <osv/vnode.h>
 #include "vfs.h"
 
+enum vtype iftovt_tab[16] = {
+	VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON,
+	VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD,
+};
+
+
 /*
  * Memo:
  *
@@ -216,7 +222,8 @@ vput(struct vnode *vp)
 	/*
 	 * Deallocate fs specific vnode data
 	 */
-	VOP_INACTIVE(vp);
+	if (vp->v_op->vop_inactive)
+		VOP_INACTIVE(vp);
 	vfs_unbusy(vp->v_mount);
 	vp->v_nrlocks--;
 	ASSERT(vp->v_nrlocks == 0);

include/osv/vnode.h

@@ -56,7 +56,8 @@ enum vtype {
 	VCHR,	    /* character device */
 	VLNK,	    /* symbolic link */
 	VSOCK,	    /* socks */
-	VFIFO	    /* FIFO */
+	VFIFO,	    /* FIFO */
+	VBAD
 };
 
 /*
@@ -182,6 +183,9 @@ void	 vrele(struct vnode *);
 int	 vcount(struct vnode *);
 void	 vflush(struct mount *);
 
+extern enum vtype iftovt_tab[];
+#define IFTOVT(mode)    (iftovt_tab[((mode) & S_IFMT) >> 12])
+
 __END_DECLS
 
 #endif /* !_SYS_VNODE_H_ */