1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
8  * Jan-Simon Pendry.
10  * Redistribution and use in source and binary forms, with or without
13  * 1. Redistributions of source code must retain the above copyright
51  * entry is added the lower vnode is VREF'd.  When the
89  * Return a VREF'ed alias for lower vnode if already exists, else 0.
103 	 * Find hash base, and then search the (two-way) linked  in null_hashget_locked()
106 	 * reference count (but NOT the lower vnode's VREF counter).  in null_hashget_locked()
110 		if (a->null_lowervp == lowervp && NULLTOV(a)->v_mount == mp) {  in null_hashget_locked()
118 			vref(vp);  in null_hashget_locked()
152 	hd = NULL_NHASH(xp->null_lowervp);  in null_hashins()
155 		if (oxp->null_lowervp == xp->null_lowervp &&  in null_hashins()
156 		    NULLTOV(oxp)->v_mount == mp) {  in null_hashins()
169 	lockmgr(&vp->v_lock, LK_EXCLUSIVE, NULL);  in null_destroy_proto()
171 	vp->v_data = NULL;  in null_destroy_proto()
172 	vp->v_vnlock = &vp->v_lock;  in null_destroy_proto()
173 	vp->v_op = &dead_vnodeops;  in null_destroy_proto()
196 	VNPASS(lowervp->v_usecount > 0, lowervp);  in null_nodeget()
220 	VNPASS(vp->v_object == NULL, vp);  in null_nodeget()
224 	xp->null_vnode = vp;  in null_nodeget()
225 	xp->null_lowervp = lowervp;  in null_nodeget()
226 	xp->null_flags = 0;  in null_nodeget()
227 	vp->v_type = lowervp->v_type;  in null_nodeget()
228 	vp->v_data = xp;  in null_nodeget()
229 	vp->v_vnlock = lowervp->v_vnlock;  in null_nodeget()
244 		MPASS(lowervp->v_object != NULL);  in null_nodeget()
245 		vp->v_object = lowervp->v_object;  in null_nodeget()
248 	if (lowervp == MOUNTTONULLMOUNT(mp)->nullm_lowerrootvp)  in null_nodeget()
249 		vp->v_vflag |= VV_ROOT;  in null_nodeget()
255 		vp->v_object = NULL;  in null_nodeget()
292 	if (vp->v_op != null_vnodeop_p) {  in null_checkvp()
293 		printf ("null_checkvp: on non-null-node\n");  in null_checkvp()
297 	if (a->null_lowervp == NULLVP) {  in null_checkvp()
301 	VI_LOCK_FLAGS(a->null_lowervp, MTX_DUPOK);  in null_checkvp()
302 	if (a->null_lowervp->v_usecount < 1)  in null_checkvp()
304 		    vp, a->null_lowervp);  in null_checkvp()
305 	VI_UNLOCK(a->null_lowervp);  in null_checkvp()
307 	printf("null %x/%d -> %x/%d [%s, %d]\n",  in null_checkvp()
309 		a->null_lowervp, vrefcnt(a->null_lowervp),  in null_checkvp()
312 	return (a->null_lowervp);  in null_checkvp()