Module Name:    src
Committed By:   ad
Date:           Mon Apr 13 19:23:20 UTC 2020

Modified Files:
        src/external/cddl/osnet/dist/uts/common/fs/zfs: zfs_vfsops.c
        src/external/cddl/osnet/sys/sys: vnode.h
        src/sys/coda: coda_namecache.c coda_subr.c coda_vnops.c
        src/sys/fs/msdosfs: msdosfs_denode.c msdosfs_vfsops.c msdosfs_vnops.c
        src/sys/fs/nilfs: nilfs_vnops.c
        src/sys/fs/ntfs: ntfs_vfsops.c
        src/sys/fs/ptyfs: ptyfs_vnops.c
        src/sys/fs/udf: udf_vfsops.c udf_vnops.c
        src/sys/fs/v7fs: v7fs_vnops.c
        src/sys/kern: exec_subr.c vfs_cache.c vfs_getcwd.c vfs_mount.c
            vfs_subr.c vfs_vnode.c vfs_vnops.c
        src/sys/miscfs/fdesc: fdesc_vfsops.c
        src/sys/miscfs/genfs: layer_subr.c layer_vnops.c
        src/sys/miscfs/nullfs: null_vfsops.c
        src/sys/miscfs/overlay: overlay_vfsops.c
        src/sys/miscfs/umapfs: umap_vfsops.c
        src/sys/nfs: nfs_vfsops.c nfs_vnops.c
        src/sys/rump/librump/rumpvfs: rump_vfs.c rumpfs.c
        src/sys/sys: vnode.h
        src/sys/ufs/lfs: lfs_vnops.c
        src/sys/ufs/mfs: mfs_vnops.c
        src/sys/ufs/ufs: ufs_vnops.c

Log Message:
Replace most uses of vp->v_usecount with a call to vrefcnt(vp), a function
that hides the details and does atomic_load_relaxed().  Signature matches
FreeBSD.


To generate a diff of this commit:
cvs rdiff -u -r1.26 -r1.27 \
    src/external/cddl/osnet/dist/uts/common/fs/zfs/zfs_vfsops.c
cvs rdiff -u -r1.15 -r1.16 src/external/cddl/osnet/sys/sys/vnode.h
cvs rdiff -u -r1.26 -r1.27 src/sys/coda/coda_namecache.c
cvs rdiff -u -r1.31 -r1.32 src/sys/coda/coda_subr.c
cvs rdiff -u -r1.110 -r1.111 src/sys/coda/coda_vnops.c
cvs rdiff -u -r1.57 -r1.58 src/sys/fs/msdosfs/msdosfs_denode.c
cvs rdiff -u -r1.134 -r1.135 src/sys/fs/msdosfs/msdosfs_vfsops.c
cvs rdiff -u -r1.100 -r1.101 src/sys/fs/msdosfs/msdosfs_vnops.c
cvs rdiff -u -r1.38 -r1.39 src/sys/fs/nilfs/nilfs_vnops.c
cvs rdiff -u -r1.109 -r1.110 src/sys/fs/ntfs/ntfs_vfsops.c
cvs rdiff -u -r1.57 -r1.58 src/sys/fs/ptyfs/ptyfs_vnops.c
cvs rdiff -u -r1.78 -r1.79 src/sys/fs/udf/udf_vfsops.c
cvs rdiff -u -r1.109 -r1.110 src/sys/fs/udf/udf_vnops.c
cvs rdiff -u -r1.27 -r1.28 src/sys/fs/v7fs/v7fs_vnops.c
cvs rdiff -u -r1.83 -r1.84 src/sys/kern/exec_subr.c
cvs rdiff -u -r1.138 -r1.139 src/sys/kern/vfs_cache.c
cvs rdiff -u -r1.57 -r1.58 src/sys/kern/vfs_getcwd.c
cvs rdiff -u -r1.77 -r1.78 src/sys/kern/vfs_mount.c
cvs rdiff -u -r1.484 -r1.485 src/sys/kern/vfs_subr.c
cvs rdiff -u -r1.119 -r1.120 src/sys/kern/vfs_vnode.c
cvs rdiff -u -r1.210 -r1.211 src/sys/kern/vfs_vnops.c
cvs rdiff -u -r1.95 -r1.96 src/sys/miscfs/fdesc/fdesc_vfsops.c
cvs rdiff -u -r1.37 -r1.38 src/sys/miscfs/genfs/layer_subr.c
cvs rdiff -u -r1.69 -r1.70 src/sys/miscfs/genfs/layer_vnops.c
cvs rdiff -u -r1.98 -r1.99 src/sys/miscfs/nullfs/null_vfsops.c
cvs rdiff -u -r1.70 -r1.71 src/sys/miscfs/overlay/overlay_vfsops.c
cvs rdiff -u -r1.102 -r1.103 src/sys/miscfs/umapfs/umap_vfsops.c
cvs rdiff -u -r1.240 -r1.241 src/sys/nfs/nfs_vfsops.c
cvs rdiff -u -r1.313 -r1.314 src/sys/nfs/nfs_vnops.c
cvs rdiff -u -r1.90 -r1.91 src/sys/rump/librump/rumpvfs/rump_vfs.c
cvs rdiff -u -r1.155 -r1.156 src/sys/rump/librump/rumpvfs/rumpfs.c
cvs rdiff -u -r1.294 -r1.295 src/sys/sys/vnode.h
cvs rdiff -u -r1.331 -r1.332 src/sys/ufs/lfs/lfs_vnops.c
cvs rdiff -u -r1.59 -r1.60 src/sys/ufs/mfs/mfs_vnops.c
cvs rdiff -u -r1.250 -r1.251 src/sys/ufs/ufs/ufs_vnops.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.

Modified files:

Index: src/external/cddl/osnet/dist/uts/common/fs/zfs/zfs_vfsops.c
diff -u src/external/cddl/osnet/dist/uts/common/fs/zfs/zfs_vfsops.c:1.26 src/external/cddl/osnet/dist/uts/common/fs/zfs/zfs_vfsops.c:1.27
--- src/external/cddl/osnet/dist/uts/common/fs/zfs/zfs_vfsops.c:1.26	Fri Jan 17 20:08:06 2020
+++ src/external/cddl/osnet/dist/uts/common/fs/zfs/zfs_vfsops.c	Mon Apr 13 19:23:17 2020
@@ -1994,7 +1994,7 @@ zfs_mount(vfs_t *vfsp, const char *path,
 	mutex_enter(mvp->v_interlock);
 	if ((uap->flags & MS_REMOUNT) == 0 &&
 	    (uap->flags & MS_OVERLAY) == 0 &&
-	    (mvp->v_count != 1 || (mvp->v_flag & VROOT))) {
+	    (vrefcnt(mvp) != 1 || (mvp->v_flag & VROOT))) {
 		mutex_exit(mvp->v_interlock);
 		return (SET_ERROR(EBUSY));
 	}

Index: src/external/cddl/osnet/sys/sys/vnode.h
diff -u src/external/cddl/osnet/sys/sys/vnode.h:1.15 src/external/cddl/osnet/sys/sys/vnode.h:1.16
--- src/external/cddl/osnet/sys/sys/vnode.h:1.15	Sat Jan 12 10:44:36 2019
+++ src/external/cddl/osnet/sys/sys/vnode.h	Mon Apr 13 19:23:17 2020
@@ -1,5 +1,4 @@
-
-/*	$NetBSD: vnode.h,v 1.15 2019/01/12 10:44:36 hannken Exp $	*/
+/*	$NetBSD: vnode.h,v 1.16 2020/04/13 19:23:17 ad Exp $	*/
 
 /*
  * CDDL HEADER START
@@ -156,7 +155,7 @@ int	vn_is_readonly(vnode_t *);
 #define	vn_vfsunlock(vp)	do { } while (0)
 #define	vn_ismntpt(vp)		((vp)->v_type == VDIR && (vp)->v_mountedhere != NULL)
 #define	vn_mountedvfs(vp)	((vp)->v_mountedhere)
-#define vn_has_cached_data(vp)	((vp)->v_uobj.uo_npages != 0)
+#define vn_has_cached_data(vp)	(((vp)->v_iflag & VI_PAGES) != 0)
 #define	vn_exists(vp)		do { } while (0)
 #define	vn_invalid(vp)		do { } while (0)
 #define	vn_free(vp)		do { } while (0)
@@ -166,7 +165,7 @@ int	vn_is_readonly(vnode_t *);
 #define	VN_HOLD(v)	vref(v)
 #define	VN_RELE(v)						      \
 do {								      \
-	if ((v)->v_usecount == 0) {				      \
+	if (vrefcnt(v) == 0) {					      \
 		printf("VN_RELE(%s,%d): %p unused\n", __FILE__, __LINE__, v); \
 		vprint("VN_RELE", (v));				      \
 		panic("VN_RELE");				      \

Index: src/sys/coda/coda_namecache.c
diff -u src/sys/coda/coda_namecache.c:1.26 src/sys/coda/coda_namecache.c:1.27
--- src/sys/coda/coda_namecache.c:1.26	Sat Oct 18 08:33:27 2014
+++ src/sys/coda/coda_namecache.c	Mon Apr 13 19:23:17 2020
@@ -1,4 +1,4 @@
-/*	$NetBSD: coda_namecache.c,v 1.26 2014/10/18 08:33:27 snj Exp $	*/
+/*	$NetBSD: coda_namecache.c,v 1.27 2020/04/13 19:23:17 ad Exp $	*/
 
 /*
  *
@@ -77,7 +77,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: coda_namecache.c,v 1.26 2014/10/18 08:33:27 snj Exp $");
+__KERNEL_RCSID(0, "$NetBSD: coda_namecache.c,v 1.27 2020/04/13 19:23:17 ad Exp $");
 
 #include <sys/param.h>
 #include <sys/errno.h>
@@ -348,12 +348,12 @@ coda_nc_remove(struct coda_cache *cncp, 
 	LIST_REMOVE(cncp, hash);
 	memset(&cncp->hash, 0, sizeof(cncp->hash));
 
-	if ((dcstat == IS_DOWNCALL) && (CTOV(cncp->dcp)->v_usecount == 1)) {
+	if ((dcstat == IS_DOWNCALL) && (vrefcnt(CTOV(cncp->dcp)) == 1)) {
 		cncp->dcp->c_flags |= C_PURGING;
 	}
 	vrele(CTOV(cncp->dcp));
 
-	if ((dcstat == IS_DOWNCALL) && (CTOV(cncp->cp)->v_usecount == 1)) {
+	if ((dcstat == IS_DOWNCALL) && (vrefcnt(CTOV(cncp->cp)) == 1)) {
 		cncp->cp->c_flags |= C_PURGING;
 	}
 	vrele(CTOV(cncp->cp));
@@ -570,7 +570,7 @@ coda_nc_flush(enum dc_status dcstat)
 			memset(&cncp->hash, 0, sizeof(cncp->hash));
 
 			if ((dcstat == IS_DOWNCALL)
-			    && (CTOV(cncp->dcp)->v_usecount == 1))
+			    && (vrefcnt(CTOV(cncp->dcp)) == 1))
 			{
 				cncp->dcp->c_flags |= C_PURGING;
 			}
@@ -584,7 +584,7 @@ coda_nc_flush(enum dc_status dcstat)
 			}
 
 			if ((dcstat == IS_DOWNCALL)
-			    && (CTOV(cncp->cp)->v_usecount == 1))
+			    && (vrefcnt(CTOV(cncp->cp)) == 1))
 			{
 				cncp->cp->c_flags |= C_PURGING;
 			}

Index: src/sys/coda/coda_subr.c
diff -u src/sys/coda/coda_subr.c:1.31 src/sys/coda/coda_subr.c:1.32
--- src/sys/coda/coda_subr.c:1.31	Tue Jan  6 11:24:46 2015
+++ src/sys/coda/coda_subr.c	Mon Apr 13 19:23:17 2020
@@ -1,4 +1,4 @@
-/*	$NetBSD: coda_subr.c,v 1.31 2015/01/06 11:24:46 hannken Exp $	*/
+/*	$NetBSD: coda_subr.c,v 1.32 2020/04/13 19:23:17 ad Exp $	*/
 
 /*
  *
@@ -55,7 +55,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: coda_subr.c,v 1.31 2015/01/06 11:24:46 hannken Exp $");
+__KERNEL_RCSID(0, "$NetBSD: coda_subr.c,v 1.32 2020/04/13 19:23:17 ad Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -220,7 +220,7 @@ coda_testflush_selector(void *cl, struct
 
 	if (cp != NULL)
 		myprintf(("Live cnode fid %s count %d\n",
-		     coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount));
+		     coda_f2s(&cp->c_fid), vrefcnt(CTOV(cp))));
 
 	return false;
 }
@@ -370,8 +370,8 @@ int handleDownCall(int opcode, union out
 		  error = coda_vmflush(cp);
 	      CODADEBUG(CODA_ZAPFILE, myprintf((
 		    "zapfile: fid = %s, refcnt = %d, error = %d\n",
-		    coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount - 1, error)););
-	      if (CTOV(cp)->v_usecount == 1) {
+		    coda_f2s(&cp->c_fid), vrefcnt(CTOV(cp)) - 1, error)););
+	      if (vrefcnt(CTOV(cp)) == 1) {
 		  cp->c_flags |= C_PURGING;
 	      }
 	      mutex_exit(&cp->c_lock);
@@ -394,8 +394,8 @@ int handleDownCall(int opcode, union out
 
 	      CODADEBUG(CODA_ZAPDIR, myprintf((
 		    "zapdir: fid = %s, refcnt = %d\n",
-		    coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount - 1)););
-	      if (CTOV(cp)->v_usecount == 1) {
+		    coda_f2s(&cp->c_fid), vrefcnt(CTOV(cp)) - 1)););
+	      if (vrefcnt(CTOV(cp)) == 1) {
 		  cp->c_flags |= C_PURGING;
 	      }
 	      mutex_exit(&cp->c_lock);
@@ -427,8 +427,8 @@ int handleDownCall(int opcode, union out
 	      }
 	      CODADEBUG(CODA_PURGEFID, myprintf((
 			 "purgefid: fid = %s, refcnt = %d, error = %d\n",
-			 coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount - 1, error)););
-	      if (CTOV(cp)->v_usecount == 1) {
+			 coda_f2s(&cp->c_fid), vrefcnt(CTOV(cp)) - 1, error)););
+	      if (vrefcnt(CTOV(cp)) == 1) {
 		  cp->c_flags |= C_PURGING;
 	      }
 	      mutex_exit(&cp->c_lock);

Index: src/sys/coda/coda_vnops.c
diff -u src/sys/coda/coda_vnops.c:1.110 src/sys/coda/coda_vnops.c:1.111
--- src/sys/coda/coda_vnops.c:1.110	Mon Feb 24 20:53:11 2020
+++ src/sys/coda/coda_vnops.c	Mon Apr 13 19:23:17 2020
@@ -1,4 +1,4 @@
-/*	$NetBSD: coda_vnops.c,v 1.110 2020/02/24 20:53:11 ad Exp $	*/
+/*	$NetBSD: coda_vnops.c,v 1.111 2020/04/13 19:23:17 ad Exp $	*/
 
 /*
  *
@@ -46,7 +46,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: coda_vnops.c,v 1.110 2020/02/24 20:53:11 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: coda_vnops.c,v 1.111 2020/04/13 19:23:17 ad Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -329,7 +329,7 @@ coda_close(void *v)
 	if (cp->c_ovp) {
 #ifdef	CODA_VERBOSE
 	    printf("%s: destroying container %d, ufs vp %p of vp %p/cp %p\n",
-		__func__, vp->v_usecount, cp->c_ovp, vp, cp);
+		__func__, vrefcnt(vp), cp->c_ovp, vp, cp);
 #endif
 #ifdef	hmm
 	    vgone(cp->c_ovp);
@@ -465,7 +465,7 @@ coda_rdwr(vnode_t *vp, struct uio *uiop,
 
     /* Have UFS handle the call. */
     CODADEBUG(CODA_RDWR, myprintf(("%s: fid = %s, refcnt = %d\n", __func__,
-	coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount)); )
+	coda_f2s(&cp->c_fid), vrefcnt(CTOV(cp)))); )
 
     if (rw == UIO_READ) {
 	error = VOP_READ(cfvp, uiop, ioflag, cred);
@@ -850,8 +850,8 @@ coda_inactive(void *v)
 
 #ifdef CODA_VERBOSE
     /* Sanity checks that perhaps should be panic. */
-    if (vp->v_usecount > 1)
-	printf("%s: %p usecount %d\n", __func__, vp, vp->v_usecount);
+    if (vrefcnt(vp) > 1)
+	printf("%s: %p usecount %d\n", __func__, vp, vrefcnt(vp));
     if (cp->c_ovp != NULL)
 	printf("%s: %p ovp != NULL\n", __func__, vp);
 #endif
@@ -1569,7 +1569,7 @@ coda_readdir(void *v)
 
 	/* Have UFS handle the call. */
 	CODADEBUG(CODA_READDIR, myprintf(("%s: fid = %s, refcnt = %d\n",
-	    __func__, coda_f2s(&cp->c_fid), vp->v_usecount)); )
+	    __func__, coda_f2s(&cp->c_fid), vrefcnt(vp))); )
 	saved_type = vp->v_type;
 	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
 	vp->v_type = VDIR; /* pretend the container file is a dir */
@@ -1661,7 +1661,7 @@ coda_reclaim(void *v)
 #endif
     } else {
 #ifdef OLD_DIAGNOSTIC
-	if (vp->v_usecount != 0)
+	if (vrefcnt(vp) != 0)
 	    print("%s: pushing active %p\n", __func__, vp);
 	if (VTOC(vp)->c_ovp) {
 	    panic("%s: c_ovp not void", __func__);

Index: src/sys/fs/msdosfs/msdosfs_denode.c
diff -u src/sys/fs/msdosfs/msdosfs_denode.c:1.57 src/sys/fs/msdosfs/msdosfs_denode.c:1.58
--- src/sys/fs/msdosfs/msdosfs_denode.c:1.57	Mon May 28 21:04:37 2018
+++ src/sys/fs/msdosfs/msdosfs_denode.c	Mon Apr 13 19:23:17 2020
@@ -1,4 +1,4 @@
-/*	$NetBSD: msdosfs_denode.c,v 1.57 2018/05/28 21:04:37 chs Exp $	*/
+/*	$NetBSD: msdosfs_denode.c,v 1.58 2020/04/13 19:23:17 ad Exp $	*/
 
 /*-
  * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
@@ -48,7 +48,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: msdosfs_denode.c,v 1.57 2018/05/28 21:04:37 chs Exp $");
+__KERNEL_RCSID(0, "$NetBSD: msdosfs_denode.c,v 1.58 2020/04/13 19:23:17 ad Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -611,8 +611,8 @@ out:
 	 * so that it can be reused immediately.
 	 */
 #ifdef MSDOSFS_DEBUG
-	printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n",
-		vp->v_usecount, dep->de_Name[0]);
+	printf("msdosfs_inactive(): usecount %d, de_Name[0] %x\n",
+		vrefcnt(vp), dep->de_Name[0]);
 #endif
 	*ap->a_recycle = (dep->de_Name[0] == SLOT_DELETED);
 

Index: src/sys/fs/msdosfs/msdosfs_vfsops.c
diff -u src/sys/fs/msdosfs/msdosfs_vfsops.c:1.134 src/sys/fs/msdosfs/msdosfs_vfsops.c:1.135
--- src/sys/fs/msdosfs/msdosfs_vfsops.c:1.134	Sat Apr  4 20:49:30 2020
+++ src/sys/fs/msdosfs/msdosfs_vfsops.c	Mon Apr 13 19:23:17 2020
@@ -1,4 +1,4 @@
-/*	$NetBSD: msdosfs_vfsops.c,v 1.134 2020/04/04 20:49:30 ad Exp $	*/
+/*	$NetBSD: msdosfs_vfsops.c,v 1.135 2020/04/13 19:23:17 ad Exp $	*/
 
 /*-
  * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
@@ -48,7 +48,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: msdosfs_vfsops.c,v 1.134 2020/04/04 20:49:30 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: msdosfs_vfsops.c,v 1.135 2020/04/13 19:23:17 ad Exp $");
 
 #if defined(_KERNEL_OPT)
 #include "opt_compat_netbsd.h"
@@ -926,7 +926,7 @@ msdosfs_unmount(struct mount *mp, int mn
 
 		printf("msdosfs_umount(): just before calling VOP_CLOSE()\n");
 		printf("flag %08x, usecount %d, writecount %d, holdcnt %d\n",
-		    vp->v_vflag | vp->v_iflag | vp->v_uflag, vp->v_usecount,
+		    vp->v_vflag | vp->v_iflag | vp->v_uflag, vrefcnt(vp),
 		    vp->v_writecount, vp->v_holdcnt);
 		printf("mount %p, op %p\n",
 		    vp->v_mount, vp->v_op);

Index: src/sys/fs/msdosfs/msdosfs_vnops.c
diff -u src/sys/fs/msdosfs/msdosfs_vnops.c:1.100 src/sys/fs/msdosfs/msdosfs_vnops.c:1.101
--- src/sys/fs/msdosfs/msdosfs_vnops.c:1.100	Sun Feb 23 15:46:40 2020
+++ src/sys/fs/msdosfs/msdosfs_vnops.c	Mon Apr 13 19:23:17 2020
@@ -1,4 +1,4 @@
-/*	$NetBSD: msdosfs_vnops.c,v 1.100 2020/02/23 15:46:40 ad Exp $	*/
+/*	$NetBSD: msdosfs_vnops.c,v 1.101 2020/04/13 19:23:17 ad Exp $	*/
 
 /*-
  * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
@@ -48,7 +48,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: msdosfs_vnops.c,v 1.100 2020/02/23 15:46:40 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: msdosfs_vnops.c,v 1.101 2020/04/13 19:23:17 ad Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -173,7 +173,7 @@ msdosfs_close(void *v)
 	struct denode *dep = VTODE(vp);
 
 	mutex_enter(vp->v_interlock);
-	if (vp->v_usecount > 1)
+	if (vrefcnt(vp) > 1)
 		DETIMES(dep, NULL, NULL, NULL, dep->de_pmp->pm_gmtoff);
 	mutex_exit(vp->v_interlock);
 	return (0);
@@ -731,8 +731,8 @@ msdosfs_remove(void *v)
 	else
 		error = removede(ddep, dep);
 #ifdef MSDOSFS_DEBUG
-	printf("msdosfs_remove(), dep %p, v_usecount %d\n",
-		dep, ap->a_vp->v_usecount);
+	printf("msdosfs_remove(), dep %p, usecount %d\n",
+		dep, vrefcnt(ap->a_vp));
 #endif
 	VN_KNOTE(ap->a_vp, NOTE_DELETE);
 	VN_KNOTE(ap->a_dvp, NOTE_WRITE);

Index: src/sys/fs/nilfs/nilfs_vnops.c
diff -u src/sys/fs/nilfs/nilfs_vnops.c:1.38 src/sys/fs/nilfs/nilfs_vnops.c:1.39
--- src/sys/fs/nilfs/nilfs_vnops.c:1.38	Fri Dec 27 09:41:51 2019
+++ src/sys/fs/nilfs/nilfs_vnops.c	Mon Apr 13 19:23:18 2020
@@ -1,4 +1,4 @@
-/* $NetBSD: nilfs_vnops.c,v 1.38 2019/12/27 09:41:51 msaitoh Exp $ */
+/*	$NetBSD: nilfs_vnops.c,v 1.39 2020/04/13 19:23:18 ad Exp $	*/
 
 /*
  * Copyright (c) 2008, 2009 Reinoud Zandijk
@@ -28,7 +28,7 @@
 
 #include <sys/cdefs.h>
 #ifndef lint
-__KERNEL_RCSID(0, "$NetBSD: nilfs_vnops.c,v 1.38 2019/12/27 09:41:51 msaitoh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: nilfs_vnops.c,v 1.39 2020/04/13 19:23:18 ad Exp $");
 #endif /* not lint */
 
 
@@ -976,8 +976,8 @@ nilfs_close(void *v)
 	nilfs_node = nilfs_node;	/* shut up gcc */
 
 	mutex_enter(vp->v_interlock);
-		if (vp->v_usecount > 1)
-			nilfs_itimes(nilfs_node, NULL, NULL, NULL);
+	if (vrefcnt(vp) > 1)
+		nilfs_itimes(nilfs_node, NULL, NULL, NULL);
 	mutex_exit(vp->v_interlock);
 
 	return 0;

Index: src/sys/fs/ntfs/ntfs_vfsops.c
diff -u src/sys/fs/ntfs/ntfs_vfsops.c:1.109 src/sys/fs/ntfs/ntfs_vfsops.c:1.110
--- src/sys/fs/ntfs/ntfs_vfsops.c:1.109	Fri Jan 17 20:08:08 2020
+++ src/sys/fs/ntfs/ntfs_vfsops.c	Mon Apr 13 19:23:18 2020
@@ -1,4 +1,4 @@
-/*	$NetBSD: ntfs_vfsops.c,v 1.109 2020/01/17 20:08:08 ad Exp $	*/
+/*	$NetBSD: ntfs_vfsops.c,v 1.110 2020/04/13 19:23:18 ad Exp $	*/
 
 /*-
  * Copyright (c) 1998, 1999 Semen Ustimenko
@@ -29,7 +29,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ntfs_vfsops.c,v 1.109 2020/01/17 20:08:08 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ntfs_vfsops.c,v 1.110 2020/04/13 19:23:18 ad Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -526,7 +526,7 @@ ntfs_unmount(struct mount *mp, int mntfl
 	/* Check if only system vnodes are rest */
 	for (i = 0; i < NTFS_SYSNODESNUM; i++)
 		if ((ntmp->ntm_sysvn[i]) &&
-		    (ntmp->ntm_sysvn[i]->v_usecount > 1))
+		    (vrefcnt(ntmp->ntm_sysvn[i]) > 1))
 			return (EBUSY);
 
 	/* Dereference all system vnodes */

Index: src/sys/fs/ptyfs/ptyfs_vnops.c
diff -u src/sys/fs/ptyfs/ptyfs_vnops.c:1.57 src/sys/fs/ptyfs/ptyfs_vnops.c:1.58
--- src/sys/fs/ptyfs/ptyfs_vnops.c:1.57	Thu Sep 26 20:57:19 2019
+++ src/sys/fs/ptyfs/ptyfs_vnops.c	Mon Apr 13 19:23:18 2020
@@ -1,4 +1,4 @@
-/*	$NetBSD: ptyfs_vnops.c,v 1.57 2019/09/26 20:57:19 christos Exp $	*/
+/*	$NetBSD: ptyfs_vnops.c,v 1.58 2020/04/13 19:23:18 ad Exp $	*/
 
 /*
  * Copyright (c) 1993, 1995
@@ -76,7 +76,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ptyfs_vnops.c,v 1.57 2019/09/26 20:57:19 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ptyfs_vnops.c,v 1.58 2020/04/13 19:23:18 ad Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -798,7 +798,7 @@ ptyfs_close(void *v)
 	struct ptyfsnode *ptyfs = VTOPTYFS(vp);
 
 	mutex_enter(vp->v_interlock);
-	if (vp->v_usecount > 1)
+	if (vrefcnt(vp) > 1)
 		PTYFS_ITIMES(ptyfs, NULL, NULL, NULL);
 	mutex_exit(vp->v_interlock);
 

Index: src/sys/fs/udf/udf_vfsops.c
diff -u src/sys/fs/udf/udf_vfsops.c:1.78 src/sys/fs/udf/udf_vfsops.c:1.79
--- src/sys/fs/udf/udf_vfsops.c:1.78	Mon Mar 16 21:20:10 2020
+++ src/sys/fs/udf/udf_vfsops.c	Mon Apr 13 19:23:18 2020
@@ -1,4 +1,4 @@
-/* $NetBSD: udf_vfsops.c,v 1.78 2020/03/16 21:20:10 pgoyette Exp $ */
+/* $NetBSD: udf_vfsops.c,v 1.79 2020/04/13 19:23:18 ad Exp $ */
 
 /*
  * Copyright (c) 2006, 2008 Reinoud Zandijk
@@ -28,7 +28,7 @@
 
 #include <sys/cdefs.h>
 #ifndef lint
-__KERNEL_RCSID(0, "$NetBSD: udf_vfsops.c,v 1.78 2020/03/16 21:20:10 pgoyette Exp $");
+__KERNEL_RCSID(0, "$NetBSD: udf_vfsops.c,v 1.79 2020/04/13 19:23:18 ad Exp $");
 #endif /* not lint */
 
 
@@ -445,8 +445,8 @@ udf_sanity_selector(void *cl, struct vno
 	if (VOP_ISLOCKED(vp) == LK_EXCLUSIVE) {
 		printf("  is locked\n");
 	}
-	if (vp->v_usecount > 1)
-		printf("  more than one usecount %d\n", vp->v_usecount);
+	if (vrefcnt(vp) > 1)
+		printf("  more than one usecount %d\n", vrefcnt(vp));
 	return false;
 }
 

Index: src/sys/fs/udf/udf_vnops.c
diff -u src/sys/fs/udf/udf_vnops.c:1.109 src/sys/fs/udf/udf_vnops.c:1.110
--- src/sys/fs/udf/udf_vnops.c:1.109	Sun Feb 23 15:46:41 2020
+++ src/sys/fs/udf/udf_vnops.c	Mon Apr 13 19:23:18 2020
@@ -1,4 +1,4 @@
-/* $NetBSD: udf_vnops.c,v 1.109 2020/02/23 15:46:41 ad Exp $ */
+/* $NetBSD: udf_vnops.c,v 1.110 2020/04/13 19:23:18 ad Exp $ */
 
 /*
  * Copyright (c) 2006, 2008 Reinoud Zandijk
@@ -32,7 +32,7 @@
 
 #include <sys/cdefs.h>
 #ifndef lint
-__KERNEL_RCSID(0, "$NetBSD: udf_vnops.c,v 1.109 2020/02/23 15:46:41 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: udf_vnops.c,v 1.110 2020/04/13 19:23:18 ad Exp $");
 #endif /* not lint */
 
 
@@ -1386,8 +1386,8 @@ udf_close(void *v)
 	}
 
 	mutex_enter(vp->v_interlock);
-		if (vp->v_usecount > 1)
-			udf_itimes(udf_node, NULL, NULL, NULL);
+	if (vrefcnt(vp) > 1)
+		udf_itimes(udf_node, NULL, NULL, NULL);
 	mutex_exit(vp->v_interlock);
 
 	return 0;

Index: src/sys/fs/v7fs/v7fs_vnops.c
diff -u src/sys/fs/v7fs/v7fs_vnops.c:1.27 src/sys/fs/v7fs/v7fs_vnops.c:1.28
--- src/sys/fs/v7fs/v7fs_vnops.c:1.27	Fri Jan 17 20:08:09 2020
+++ src/sys/fs/v7fs/v7fs_vnops.c	Mon Apr 13 19:23:18 2020
@@ -1,4 +1,4 @@
-/*	$NetBSD: v7fs_vnops.c,v 1.27 2020/01/17 20:08:09 ad Exp $	*/
+/*	$NetBSD: v7fs_vnops.c,v 1.28 2020/04/13 19:23:18 ad Exp $	*/
 
 /*-
  * Copyright (c) 2004, 2011 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: v7fs_vnops.c,v 1.27 2020/01/17 20:08:09 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: v7fs_vnops.c,v 1.28 2020/04/13 19:23:18 ad Exp $");
 #if defined _KERNEL_OPT
 #include "opt_v7fs.h"
 #endif
@@ -138,7 +138,7 @@ v7fs_lookup(void *v)
 		if ((nameiop == RENAME) && islastcn) {
 			return EISDIR; /* t_vnops rename_dir(3) */
 		}
-		vref(dvp); /* v_usecount++ */
+		vref(dvp); /* usecount++ */
 		*a->a_vpp = dvp;
 		DPRINTF("done.(.)\n");
 		return 0;
@@ -717,9 +717,9 @@ v7fs_remove(void *v)
 
 out:
 	if (dvp == vp)
-		vrele(vp); /* v_usecount-- of unlocked vp */
+		vrele(vp); /* usecount-- of unlocked vp */
 	else
-		vput(vp); /* unlock vp and then v_usecount-- */
+		vput(vp); /* unlock vp and then usecount-- */
 
 	return error;
 }

Index: src/sys/kern/exec_subr.c
diff -u src/sys/kern/exec_subr.c:1.83 src/sys/kern/exec_subr.c:1.84
--- src/sys/kern/exec_subr.c:1.83	Sun Jan 12 18:30:58 2020
+++ src/sys/kern/exec_subr.c	Mon Apr 13 19:23:18 2020
@@ -1,4 +1,4 @@
-/*	$NetBSD: exec_subr.c,v 1.83 2020/01/12 18:30:58 ad Exp $	*/
+/*	$NetBSD: exec_subr.c,v 1.84 2020/04/13 19:23:18 ad Exp $	*/
 
 /*
  * Copyright (c) 1993, 1994, 1996 Christopher G. Demetriou
@@ -31,7 +31,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: exec_subr.c,v 1.83 2020/01/12 18:30:58 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: exec_subr.c,v 1.84 2020/04/13 19:23:18 ad Exp $");
 
 #include "opt_pax.h"
 
@@ -87,7 +87,7 @@ new_vmcmd(struct exec_vmcmd_set *evsp,
 
 	VMCMD_EVCNT_INCR(calls);
 	KASSERT(proc != vmcmd_map_pagedvn || (vp->v_iflag & VI_TEXT));
-	KASSERT(vp == NULL || vp->v_usecount > 0);
+	KASSERT(vp == NULL || vrefcnt(vp) > 0);
 
 	if (evsp->evs_used >= evsp->evs_cnt)
 		vmcmdset_extend(evsp);

Index: src/sys/kern/vfs_cache.c
diff -u src/sys/kern/vfs_cache.c:1.138 src/sys/kern/vfs_cache.c:1.139
--- src/sys/kern/vfs_cache.c:1.138	Fri Apr 10 16:55:40 2020
+++ src/sys/kern/vfs_cache.c	Mon Apr 13 19:23:18 2020
@@ -1,4 +1,4 @@
-/*	$NetBSD: vfs_cache.c,v 1.138 2020/04/10 16:55:40 ad Exp $	*/
+/*	$NetBSD: vfs_cache.c,v 1.139 2020/04/13 19:23:18 ad Exp $	*/
 
 /*-
  * Copyright (c) 2008, 2019, 2020 The NetBSD Foundation, Inc.
@@ -172,7 +172,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: vfs_cache.c,v 1.138 2020/04/10 16:55:40 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: vfs_cache.c,v 1.139 2020/04/13 19:23:18 ad Exp $");
 
 #define __NAMECACHE_PRIVATE
 #ifdef _KERNEL_OPT
@@ -673,7 +673,7 @@ cache_lookup_linked(struct vnode *dvp, c
 		}
 		*plock = &dvi->vi_nc_lock;
 	} else if (*plock == NULL) {
-		KASSERT(dvp->v_usecount > 0);
+		KASSERT(vrefcnt(dvp) > 0);
 	}
 
 	/*

Index: src/sys/kern/vfs_getcwd.c
diff -u src/sys/kern/vfs_getcwd.c:1.57 src/sys/kern/vfs_getcwd.c:1.58
--- src/sys/kern/vfs_getcwd.c:1.57	Sat Apr  4 20:49:30 2020
+++ src/sys/kern/vfs_getcwd.c	Mon Apr 13 19:23:18 2020
@@ -1,4 +1,4 @@
-/* $NetBSD: vfs_getcwd.c,v 1.57 2020/04/04 20:49:30 ad Exp $ */
+/* $NetBSD: vfs_getcwd.c,v 1.58 2020/04/13 19:23:18 ad Exp $ */
 
 /*-
  * Copyright (c) 1999, 2020 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: vfs_getcwd.c,v 1.57 2020/04/04 20:49:30 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: vfs_getcwd.c,v 1.58 2020/04/13 19:23:18 ad Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -527,7 +527,7 @@ vnode_to_path(char *path, size_t len, st
 	char *bp, *bend;
 	struct vnode *dvp;
 
-	KASSERT(vp->v_usecount > 0);
+	KASSERT(vrefcnt(vp) > 0);
 
 	bp = bend = &path[len];
 	*(--bp) = '\0';

Index: src/sys/kern/vfs_mount.c
diff -u src/sys/kern/vfs_mount.c:1.77 src/sys/kern/vfs_mount.c:1.78
--- src/sys/kern/vfs_mount.c:1.77	Mon Apr 13 15:54:45 2020
+++ src/sys/kern/vfs_mount.c	Mon Apr 13 19:23:18 2020
@@ -1,4 +1,4 @@
-/*	$NetBSD: vfs_mount.c,v 1.77 2020/04/13 15:54:45 maxv Exp $	*/
+/*	$NetBSD: vfs_mount.c,v 1.78 2020/04/13 19:23:18 ad Exp $	*/
 
 /*-
  * Copyright (c) 1997-2020 The NetBSD Foundation, Inc.
@@ -67,7 +67,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: vfs_mount.c,v 1.77 2020/04/13 15:54:45 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: vfs_mount.c,v 1.78 2020/04/13 19:23:18 ad Exp $");
 
 #include <sys/param.h>
 #include <sys/kernel.h>
@@ -395,7 +395,7 @@ vfs_vnode_iterator_destroy(struct vnode_
 	kmutex_t *lock;
 
 	KASSERT(vnis_marker(mvp));
-	if (mvp->v_usecount != 0) {
+	if (vrefcnt(mvp) != 0) {
 		lock = mvp->v_mount->mnt_vnodelock;
 		mutex_enter(lock);
 		TAILQ_REMOVE(&mvp->v_mount->mnt_vnodelist, mvip, vi_mntvnodes);
@@ -581,7 +581,7 @@ vflush_one(vnode_t *vp, vnode_t *skipvp,
 	 * kill them.
 	 */
 	if (flags & FORCECLOSE) {
-		if (vp->v_usecount > 1 &&
+		if (vrefcnt(vp) > 1 &&
 		    (vp->v_type == VBLK || vp->v_type == VCHR))
 			vcache_make_anon(vp);
 		else
@@ -651,7 +651,7 @@ mount_checkdirs(vnode_t *olddp)
 	struct proc *p;
 	bool retry;
 
-	if (olddp->v_usecount == 1) {
+	if (vrefcnt(olddp) == 1) {
 		return;
 	}
 	if (VFS_ROOT(olddp->v_mountedhere, LK_EXCLUSIVE, &newdp))

Index: src/sys/kern/vfs_subr.c
diff -u src/sys/kern/vfs_subr.c:1.484 src/sys/kern/vfs_subr.c:1.485
--- src/sys/kern/vfs_subr.c:1.484	Sat Mar 14 20:45:23 2020
+++ src/sys/kern/vfs_subr.c	Mon Apr 13 19:23:18 2020
@@ -1,4 +1,4 @@
-/*	$NetBSD: vfs_subr.c,v 1.484 2020/03/14 20:45:23 ad Exp $	*/
+/*	$NetBSD: vfs_subr.c,v 1.485 2020/04/13 19:23:18 ad Exp $	*/
 
 /*-
  * Copyright (c) 1997, 1998, 2004, 2005, 2007, 2008, 2019, 2020
@@ -69,7 +69,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: vfs_subr.c,v 1.484 2020/03/14 20:45:23 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: vfs_subr.c,v 1.485 2020/04/13 19:23:18 ad Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_ddb.h"
@@ -1104,7 +1104,7 @@ vprint_common(struct vnode *vp, const ch
 	    ARRAY_PRINT(vp->v_type, vnode_types), vp->v_type,
 	    vp->v_mount, vp->v_mountedhere);
 	(*pr)("%susecount %d writecount %d holdcount %d\n", prefix,
-	    vp->v_usecount, vp->v_writecount, vp->v_holdcnt);
+	    vrefcnt(vp), vp->v_writecount, vp->v_holdcnt);
 	(*pr)("%ssize %" PRIx64 " writesize %" PRIx64 " numoutput %d\n",
 	    prefix, vp->v_size, vp->v_writesize, vp->v_numoutput);
 	(*pr)("%sdata %p lock %p\n", prefix, vp->v_data, &vip->vi_lock);

Index: src/sys/kern/vfs_vnode.c
diff -u src/sys/kern/vfs_vnode.c:1.119 src/sys/kern/vfs_vnode.c:1.120
--- src/sys/kern/vfs_vnode.c:1.119	Mon Apr 13 15:54:45 2020
+++ src/sys/kern/vfs_vnode.c	Mon Apr 13 19:23:18 2020
@@ -1,4 +1,4 @@
-/*	$NetBSD: vfs_vnode.c,v 1.119 2020/04/13 15:54:45 maxv Exp $	*/
+/*	$NetBSD: vfs_vnode.c,v 1.120 2020/04/13 19:23:18 ad Exp $	*/
 
 /*-
  * Copyright (c) 1997-2011, 2019, 2020 The NetBSD Foundation, Inc.
@@ -155,7 +155,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: vfs_vnode.c,v 1.119 2020/04/13 15:54:45 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: vfs_vnode.c,v 1.120 2020/04/13 19:23:18 ad Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_pax.h"
@@ -236,6 +236,16 @@ extern int		(**dead_vnodeop_p)(void *);
 extern int		(**spec_vnodeop_p)(void *);
 extern struct vfsops	dead_vfsops;
 
+/*
+ * Return the current usecount of a vnode.
+ */
+inline int
+vrefcnt(struct vnode *vp)
+{
+
+	return atomic_load_relaxed(&vp->v_usecount);
+}
+
 /* Vnode state operations and diagnostics. */
 
 #if defined(DIAGNOSTIC)
@@ -254,6 +264,7 @@ _vstate_assert(vnode_t *vp, enum vnode_s
     bool has_lock)
 {
 	vnode_impl_t *vip = VNODE_TO_VIMPL(vp);
+	int refcnt = vrefcnt(vp);
 
 	if (!has_lock) {
 		/*
@@ -261,7 +272,7 @@ _vstate_assert(vnode_t *vp, enum vnode_s
 		 * without loooking first.
 		 */
 		membar_enter();
-		if (state == VS_ACTIVE && vp->v_usecount > 0 &&
+		if (state == VS_ACTIVE && refcnt > 0 &&
 		    (vip->vi_state == VS_LOADED || vip->vi_state == VS_BLOCKED))
 			return;
 		if (vip->vi_state == state)
@@ -271,7 +282,7 @@ _vstate_assert(vnode_t *vp, enum vnode_s
 
 	KASSERTMSG(mutex_owned(vp->v_interlock), "at %s:%d", func, line);
 
-	if ((state == VS_ACTIVE && vp->v_usecount > 0 &&
+	if ((state == VS_ACTIVE && refcnt > 0 &&
 	    (vip->vi_state == VS_LOADED || vip->vi_state == VS_BLOCKED)) ||
 	    vip->vi_state == state) {
 		if (!has_lock)
@@ -279,7 +290,7 @@ _vstate_assert(vnode_t *vp, enum vnode_s
 		return;
 	}
 	vnpanic(vp, "state is %s, usecount %d, expected %s at %s:%d",
-	    vstate_name(vip->vi_state), vp->v_usecount,
+	    vstate_name(vip->vi_state), refcnt,
 	    vstate_name(state), func, line);
 }
 
@@ -319,6 +330,7 @@ vstate_assert_change(vnode_t *vp, enum v
     const char *func, int line)
 {
 	vnode_impl_t *vip = VNODE_TO_VIMPL(vp);
+	int refcnt = vrefcnt(vp);
 
 	KASSERTMSG(mutex_owned(vp->v_interlock), "at %s:%d", func, line);
 	if (from == VS_LOADING)
@@ -333,9 +345,9 @@ vstate_assert_change(vnode_t *vp, enum v
 	if (vip->vi_state != from)
 		vnpanic(vp, "from is %s, expected %s at %s:%d\n",
 		    vstate_name(vip->vi_state), vstate_name(from), func, line);
-	if ((from == VS_BLOCKED || to == VS_BLOCKED) && vp->v_usecount != 1)
+	if ((from == VS_BLOCKED || to == VS_BLOCKED) && refcnt != 1)
 		vnpanic(vp, "%s to %s with usecount %d at %s:%d",
-		    vstate_name(from), vstate_name(to), vp->v_usecount,
+		    vstate_name(from), vstate_name(to), refcnt,
 		    func, line);
 
 	vip->vi_state = to;
@@ -568,13 +580,13 @@ vdrain_remove(vnode_t *vp)
 	KASSERT(mutex_owned(&vdrain_lock));
 
 	/* Probe usecount (unlocked). */
-	if (vp->v_usecount > 0)
+	if (vrefcnt(vp) > 0)
 		return;
 	/* Try v_interlock -- we lock the wrong direction! */
 	if (!mutex_tryenter(vp->v_interlock))
 		return;
 	/* Probe usecount and state. */
-	if (vp->v_usecount > 0 || VSTATE_GET(vp) != VS_LOADED) {
+	if (vrefcnt(vp) > 0 || VSTATE_GET(vp) != VS_LOADED) {
 		mutex_exit(vp->v_interlock);
 		return;
 	}
@@ -617,7 +629,7 @@ vdrain_vrele(vnode_t *vp)
 	 * First remove the vnode from the vrele list.
 	 * Put it on the last lru list, the last vrele()
 	 * will put it back onto the right list before
-	 * its v_usecount reaches zero.
+	 * its usecount reaches zero.
 	 */
 	KASSERT(vip->vi_lrulisthd == &lru_list[LRU_VRELE]);
 	TAILQ_REMOVE(vip->vi_lrulisthd, vip, vi_lrulist);
@@ -715,13 +727,13 @@ vput(vnode_t *vp)
 	int lktype;
 
 	/*
-	 * Do an unlocked check of v_usecount.  If it looks like we're not
+	 * Do an unlocked check of the usecount.  If it looks like we're not
 	 * about to drop the last reference, then unlock the vnode and try
 	 * to drop the reference.  If it ends up being the last reference
 	 * after all, vrelel() can fix it all up.  Most of the time this
 	 * will all go to plan.
 	 */
-	if (atomic_load_relaxed(&vp->v_usecount) > 1) {
+	if (vrefcnt(vp) > 1) {
 		VOP_UNLOCK(vp);
 		if (vtryrele(vp)) {
 			return;
@@ -768,7 +780,7 @@ vrelel(vnode_t *vp, int flags, int lktyp
 		mutex_exit(vp->v_interlock);
 		return;
 	}
-	if (vp->v_usecount <= 0 || vp->v_writecount != 0) {
+	if (vrefcnt(vp) <= 0 || vp->v_writecount != 0) {
 		vnpanic(vp, "%s: bad ref count", __func__);
 	}
 
@@ -869,7 +881,7 @@ vrelel(vnode_t *vp, int flags, int lktyp
 		} else {
 			VOP_UNLOCK(vp);
 		}
-		KASSERT(vp->v_usecount > 0);
+		KASSERT(vrefcnt(vp) > 0);
 	}
 
 	if (atomic_dec_uint_nv(&vp->v_usecount) != 0) {
@@ -930,7 +942,7 @@ void
 vref(vnode_t *vp)
 {
 
-	KASSERT(atomic_load_relaxed(&vp->v_usecount) != 0);
+	KASSERT(vrefcnt(vp) > 0);
 
 	atomic_inc_uint(&vp->v_usecount);
 }
@@ -945,7 +957,7 @@ vholdl(vnode_t *vp)
 
 	KASSERT(mutex_owned(vp->v_interlock));
 
-	if (vp->v_holdcnt++ == 0 && vp->v_usecount == 0)
+	if (vp->v_holdcnt++ == 0 && vrefcnt(vp) == 0)
 		lru_requeue(vp, lru_which(vp));
 }
 
@@ -976,7 +988,7 @@ holdrelel(vnode_t *vp)
 	}
 
 	vp->v_holdcnt--;
-	if (vp->v_holdcnt == 0 && vp->v_usecount == 0)
+	if (vp->v_holdcnt == 0 && vrefcnt(vp) == 0)
 		lru_requeue(vp, lru_which(vp));
 }
 
@@ -1004,7 +1016,7 @@ vrecycle(vnode_t *vp)
 
 	/* Make sure we hold the last reference. */
 	VSTATE_WAIT_STABLE(vp);
-	if (vp->v_usecount != 1) {
+	if (vrefcnt(vp) != 1) {
 		mutex_exit(vp->v_interlock);
 		return false;
 	}
@@ -1036,7 +1048,7 @@ vrecycle(vnode_t *vp)
 		return false;
 	}
 
-	KASSERT(vp->v_usecount == 1);
+	KASSERT(vrefcnt(vp) == 1);
 	vcache_reclaim(vp);
 	vrelel(vp, 0, LK_NONE);
 
@@ -1085,7 +1097,7 @@ vrevoke(vnode_t *vp)
 	enum vtype type;
 	dev_t dev;
 
-	KASSERT(vp->v_usecount > 0);
+	KASSERT(vrefcnt(vp) > 0);
 
 	mp = vrevoke_suspend_next(NULL, vp->v_mount);
 
@@ -1273,7 +1285,7 @@ vcache_free(vnode_impl_t *vip)
 	vp = VIMPL_TO_VNODE(vip);
 	KASSERT(mutex_owned(vp->v_interlock));
 
-	KASSERT(vp->v_usecount == 0);
+	KASSERT(vrefcnt(vp) == 0);
 	KASSERT(vp->v_holdcnt == 0);
 	KASSERT(vp->v_writecount == 0);
 	lru_requeue(vp, NULL);
@@ -1339,7 +1351,7 @@ vcache_vget(vnode_t *vp)
 
 	/* If this was the last reference to a reclaimed vnode free it now. */
 	if (__predict_false(VSTATE_GET(vp) == VS_RECLAIMED)) {
-		if (vp->v_holdcnt == 0 && vp->v_usecount == 0)
+		if (vp->v_holdcnt == 0 && vrefcnt(vp) == 0)
 			vcache_free(VNODE_TO_VIMPL(vp));
 		else
 			mutex_exit(vp->v_interlock);
@@ -1654,9 +1666,9 @@ vcache_reclaim(vnode_t *vp)
 	KASSERT((vp->v_vflag & VV_LOCKSWORK) == 0 ||
 	    VOP_ISLOCKED(vp) == LK_EXCLUSIVE);
 	KASSERT(mutex_owned(vp->v_interlock));
-	KASSERT(vp->v_usecount != 0);
+	KASSERT(vrefcnt(vp) != 0);
 
-	active = (vp->v_usecount > 1);
+	active = (vrefcnt(vp) > 1);
 	temp_key_len = vip->vi_key.vk_key_len;
 	/*
 	 * Prevent the vnode from being recycled or brought into use

Index: src/sys/kern/vfs_vnops.c
diff -u src/sys/kern/vfs_vnops.c:1.210 src/sys/kern/vfs_vnops.c:1.211
--- src/sys/kern/vfs_vnops.c:1.210	Sun Apr 12 19:56:14 2020
+++ src/sys/kern/vfs_vnops.c	Mon Apr 13 19:23:18 2020
@@ -1,4 +1,4 @@
-/*	$NetBSD: vfs_vnops.c,v 1.210 2020/04/12 19:56:14 christos Exp $	*/
+/*	$NetBSD: vfs_vnops.c,v 1.211 2020/04/13 19:23:18 ad Exp $	*/
 
 /*-
  * Copyright (c) 2009 The NetBSD Foundation, Inc.
@@ -66,7 +66,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: vfs_vnops.c,v 1.210 2020/04/12 19:56:14 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: vfs_vnops.c,v 1.211 2020/04/13 19:23:18 ad Exp $");
 
 #include "veriexec.h"
 
@@ -1041,7 +1041,7 @@ vn_lock(struct vnode *vp, int flags)
 	int error;
 
 #if 0
-	KASSERT(vp->v_usecount > 0 || (vp->v_iflag & VI_ONWORKLST) != 0);
+	KASSERT(vrefcnt(vp) > 0 || (vp->v_iflag & VI_ONWORKLST) != 0);
 #endif
 	KASSERT((flags & ~(LK_SHARED|LK_EXCLUSIVE|LK_NOWAIT|LK_RETRY|
 	    LK_UPGRADE|LK_DOWNGRADE)) == 0);

Index: src/sys/miscfs/fdesc/fdesc_vfsops.c
diff -u src/sys/miscfs/fdesc/fdesc_vfsops.c:1.95 src/sys/miscfs/fdesc/fdesc_vfsops.c:1.96
--- src/sys/miscfs/fdesc/fdesc_vfsops.c:1.95	Sat Mar 21 16:30:39 2020
+++ src/sys/miscfs/fdesc/fdesc_vfsops.c	Mon Apr 13 19:23:18 2020
@@ -1,4 +1,4 @@
-/*	$NetBSD: fdesc_vfsops.c,v 1.95 2020/03/21 16:30:39 pgoyette Exp $	*/
+/*	$NetBSD: fdesc_vfsops.c,v 1.96 2020/04/13 19:23:18 ad Exp $	*/
 
 /*
  * Copyright (c) 1992, 1993, 1995
@@ -41,7 +41,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: fdesc_vfsops.c,v 1.95 2020/03/21 16:30:39 pgoyette Exp $");
+__KERNEL_RCSID(0, "$NetBSD: fdesc_vfsops.c,v 1.96 2020/04/13 19:23:18 ad Exp $");
 
 #if defined(_KERNEL_OPT)
 #include "opt_compat_netbsd.h"
@@ -119,7 +119,7 @@ fdesc_unmount(struct mount *mp, int mntf
 	if (mntflags & MNT_FORCE)
 		flags |= FORCECLOSE;
 
-	if (rtvp->v_usecount > 1 && (mntflags & MNT_FORCE) == 0)
+	if (vrefcnt(rtvp) > 1 && (mntflags & MNT_FORCE) == 0)
 		return (EBUSY);
 	if ((error = vflush(mp, rtvp, flags)) != 0)
 		return (error);

Index: src/sys/miscfs/genfs/layer_subr.c
diff -u src/sys/miscfs/genfs/layer_subr.c:1.37 src/sys/miscfs/genfs/layer_subr.c:1.38
--- src/sys/miscfs/genfs/layer_subr.c:1.37	Sun Nov  9 18:08:07 2014
+++ src/sys/miscfs/genfs/layer_subr.c	Mon Apr 13 19:23:19 2020
@@ -1,4 +1,4 @@
-/*	$NetBSD: layer_subr.c,v 1.37 2014/11/09 18:08:07 maxv Exp $	*/
+/*	$NetBSD: layer_subr.c,v 1.38 2020/04/13 19:23:19 ad Exp $	*/
 
 /*
  * Copyright (c) 1999 National Aeronautics & Space Administration
@@ -69,7 +69,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: layer_subr.c,v 1.37 2014/11/09 18:08:07 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: layer_subr.c,v 1.38 2020/04/13 19:23:19 ad Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -127,7 +127,7 @@ layer_node_create(struct mount *mp, stru
 	 * reference to the lower node.
 	 */
 	vrele(lowervp);
-	KASSERT(lowervp->v_usecount > 0);
+	KASSERT(vrefcnt(lowervp) > 0);
 
 #ifdef LAYERFS_DIAGNOSTIC
 	if (layerfs_debug)
@@ -167,7 +167,7 @@ layer_checkvp(struct vnode *vp, const ch
 		/* wait for debugger */
 		panic("layer_checkvp");
 	}
-	if (a->layer_lowervp->v_usecount < 1) {
+	if (vrefcnt(a->layer_lowervp) < 1) {
 		int i; u_long *p;
 		printf("vp = %p, unref'ed lowervp\n", vp);
 		for (p = (u_long *) a, i = 0; i < 8; i++)
@@ -178,8 +178,8 @@ layer_checkvp(struct vnode *vp, const ch
 	};
 #ifdef notnow
 	printf("layer %p/%d -> %p/%d [%s, %d]\n",
-	        LAYERTOV(a), LAYERTOV(a)->v_usecount,
-		a->layer_lowervp, a->layer_lowervp->v_usecount,
+	        LAYERTOV(a), vrefcnt(LAYERTOV(a)),
+		a->layer_lowervp, vrefcnt(a->layer_lowervp),
 		fil, lno);
 #endif
 	return a->layer_lowervp;

Index: src/sys/miscfs/genfs/layer_vnops.c
diff -u src/sys/miscfs/genfs/layer_vnops.c:1.69 src/sys/miscfs/genfs/layer_vnops.c:1.70
--- src/sys/miscfs/genfs/layer_vnops.c:1.69	Sat Apr  4 20:49:30 2020
+++ src/sys/miscfs/genfs/layer_vnops.c	Mon Apr 13 19:23:19 2020
@@ -1,4 +1,4 @@
-/*	$NetBSD: layer_vnops.c,v 1.69 2020/04/04 20:49:30 ad Exp $	*/
+/*	$NetBSD: layer_vnops.c,v 1.70 2020/04/13 19:23:19 ad Exp $	*/
 
 /*
  * Copyright (c) 1999 National Aeronautics & Space Administration
@@ -170,7 +170,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: layer_vnops.c,v 1.69 2020/04/04 20:49:30 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: layer_vnops.c,v 1.70 2020/04/13 19:23:19 ad Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -692,7 +692,7 @@ layer_revoke(void *v)
 	int error;
 
 	/*
-	 * We will most likely end up in vclean which uses the v_usecount
+	 * We will most likely end up in vclean which uses the usecount
 	 * to determine if a vnode is active.  Take an extra reference on
 	 * the lower vnode so it will always close and inactivate.
 	 */

Index: src/sys/miscfs/nullfs/null_vfsops.c
diff -u src/sys/miscfs/nullfs/null_vfsops.c:1.98 src/sys/miscfs/nullfs/null_vfsops.c:1.99
--- src/sys/miscfs/nullfs/null_vfsops.c:1.98	Sat Apr  4 20:49:30 2020
+++ src/sys/miscfs/nullfs/null_vfsops.c	Mon Apr 13 19:23:19 2020
@@ -1,4 +1,4 @@
-/*	$NetBSD: null_vfsops.c,v 1.98 2020/04/04 20:49:30 ad Exp $	*/
+/*	$NetBSD: null_vfsops.c,v 1.99 2020/04/13 19:23:19 ad Exp $	*/
 
 /*
  * Copyright (c) 1999 National Aeronautics & Space Administration
@@ -76,7 +76,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: null_vfsops.c,v 1.98 2020/04/04 20:49:30 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: null_vfsops.c,v 1.99 2020/04/13 19:23:19 ad Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -190,7 +190,7 @@ nullfs_unmount(struct mount *mp, int mnt
 	if (mntflags & MNT_FORCE)
 		flags |= FORCECLOSE;
 
-	if (null_rootvp->v_usecount > 1 && (mntflags & MNT_FORCE) == 0)
+	if (vrefcnt(null_rootvp) > 1 && (mntflags & MNT_FORCE) == 0)
 		return EBUSY;
 
 	if ((error = vflush(mp, null_rootvp, flags)) != 0)

Index: src/sys/miscfs/overlay/overlay_vfsops.c
diff -u src/sys/miscfs/overlay/overlay_vfsops.c:1.70 src/sys/miscfs/overlay/overlay_vfsops.c:1.71
--- src/sys/miscfs/overlay/overlay_vfsops.c:1.70	Sat Mar 21 16:30:39 2020
+++ src/sys/miscfs/overlay/overlay_vfsops.c	Mon Apr 13 19:23:19 2020
@@ -1,4 +1,4 @@
-/*	$NetBSD: overlay_vfsops.c,v 1.70 2020/03/21 16:30:39 pgoyette Exp $	*/
+/*	$NetBSD: overlay_vfsops.c,v 1.71 2020/04/13 19:23:19 ad Exp $	*/
 
 /*
  * Copyright (c) 1999, 2000 National Aeronautics & Space Administration
@@ -74,7 +74,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: overlay_vfsops.c,v 1.70 2020/03/21 16:30:39 pgoyette Exp $");
+__KERNEL_RCSID(0, "$NetBSD: overlay_vfsops.c,v 1.71 2020/04/13 19:23:19 ad Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -215,7 +215,7 @@ ov_unmount(struct mount *mp, int mntflag
 	if (mntflags & MNT_FORCE)
 		flags |= FORCECLOSE;
 
-	if (overlay_rootvp->v_usecount > 1 && (mntflags & MNT_FORCE) == 0)
+	if (vrefcnt(overlay_rootvp) > 1 && (mntflags & MNT_FORCE) == 0)
 		return (EBUSY);
 	if ((error = vflush(mp, overlay_rootvp, flags)) != 0)
 		return (error);

Index: src/sys/miscfs/umapfs/umap_vfsops.c
diff -u src/sys/miscfs/umapfs/umap_vfsops.c:1.102 src/sys/miscfs/umapfs/umap_vfsops.c:1.103
--- src/sys/miscfs/umapfs/umap_vfsops.c:1.102	Mon Mar 16 21:20:11 2020
+++ src/sys/miscfs/umapfs/umap_vfsops.c	Mon Apr 13 19:23:19 2020
@@ -1,4 +1,4 @@
-/*	$NetBSD: umap_vfsops.c,v 1.102 2020/03/16 21:20:11 pgoyette Exp $	*/
+/*	$NetBSD: umap_vfsops.c,v 1.103 2020/04/13 19:23:19 ad Exp $	*/
 
 /*
  * Copyright (c) 1992, 1993
@@ -41,7 +41,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: umap_vfsops.c,v 1.102 2020/03/16 21:20:11 pgoyette Exp $");
+__KERNEL_RCSID(0, "$NetBSD: umap_vfsops.c,v 1.103 2020/04/13 19:23:19 ad Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -274,7 +274,7 @@ umapfs_unmount(struct mount *mp, int mnt
 	if (mntflags & MNT_FORCE)
 		flags |= FORCECLOSE;
 
-	if (rtvp->v_usecount > 1 && (mntflags & MNT_FORCE) == 0)
+	if (vrefcnt(rtvp) > 1 && (mntflags & MNT_FORCE) == 0)
 		return (EBUSY);
 	if ((error = vflush(mp, rtvp, flags)) != 0)
 		return (error);

Index: src/sys/nfs/nfs_vfsops.c
diff -u src/sys/nfs/nfs_vfsops.c:1.240 src/sys/nfs/nfs_vfsops.c:1.241
--- src/sys/nfs/nfs_vfsops.c:1.240	Mon Mar 16 21:20:11 2020
+++ src/sys/nfs/nfs_vfsops.c	Mon Apr 13 19:23:20 2020
@@ -1,4 +1,4 @@
-/*	$NetBSD: nfs_vfsops.c,v 1.240 2020/03/16 21:20:11 pgoyette Exp $	*/
+/*	$NetBSD: nfs_vfsops.c,v 1.241 2020/04/13 19:23:20 ad Exp $	*/
 
 /*
  * Copyright (c) 1989, 1993, 1995
@@ -35,7 +35,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: nfs_vfsops.c,v 1.240 2020/03/16 21:20:11 pgoyette Exp $");
+__KERNEL_RCSID(0, "$NetBSD: nfs_vfsops.c,v 1.241 2020/04/13 19:23:20 ad Exp $");
 
 #if defined(_KERNEL_OPT)
 #include "opt_nfs.h"
@@ -863,7 +863,7 @@ nfs_unmount(struct mount *mp, int mntfla
 	if (error != 0)
 		goto err;
 
-	if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 1) {
+	if ((mntflags & MNT_FORCE) == 0 && vrefcnt(vp) > 1) {
 		VOP_UNLOCK(vp);
 		error = EBUSY;
 		goto err;

Index: src/sys/nfs/nfs_vnops.c
diff -u src/sys/nfs/nfs_vnops.c:1.313 src/sys/nfs/nfs_vnops.c:1.314
--- src/sys/nfs/nfs_vnops.c:1.313	Sun Feb 23 15:46:41 2020
+++ src/sys/nfs/nfs_vnops.c	Mon Apr 13 19:23:20 2020
@@ -1,4 +1,4 @@
-/*	$NetBSD: nfs_vnops.c,v 1.313 2020/02/23 15:46:41 ad Exp $	*/
+/*	$NetBSD: nfs_vnops.c,v 1.314 2020/04/13 19:23:20 ad Exp $	*/
 
 /*
  * Copyright (c) 1989, 1993
@@ -39,7 +39,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: nfs_vnops.c,v 1.313 2020/02/23 15:46:41 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: nfs_vnops.c,v 1.314 2020/04/13 19:23:20 ad Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_nfs.h"
@@ -1729,7 +1729,7 @@ again:
  * To try and make nfs semantics closer to ufs semantics, a file that has
  * other processes using the vnode is renamed instead of removed and then
  * removed later on the last close.
- * - If v_usecount > 1
+ * - If vrefcnt(vp) > 1
  *	  If a rename is not already in the works
  *	     call nfs_sillyrename() to set it up
  *     else
@@ -1752,12 +1752,12 @@ nfs_remove(void *v)
 	struct vattr vattr;
 
 #ifndef DIAGNOSTIC
-	if (vp->v_usecount < 1)
-		panic("nfs_remove: bad v_usecount");
+	if (vrefcnt(vp) < 1)
+		panic("nfs_remove: bad vrefcnt(vp)");
 #endif
 	if (vp->v_type == VDIR)
 		error = EPERM;
-	else if (vp->v_usecount == 1 || (np->n_sillyrename &&
+	else if (vrefcnt(vp) == 1 || (np->n_sillyrename &&
 	    VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 &&
 	    vattr.va_nlink > 1)) {
 		/*
@@ -1886,7 +1886,7 @@ nfs_rename(void *v)
 	 * so that we don't lose the file if the rename fails, and so
 	 * that there's no window when the "to" file doesn't exist.
 	 */
-	if (tvp && tvp->v_usecount > 1 && !VTONFS(tvp)->n_sillyrename &&
+	if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename &&
 	    tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp, true)) {
 		VN_KNOTE(tvp, NOTE_DELETE);
 		vput(tvp);
@@ -3443,7 +3443,7 @@ nfsspec_close(void *v)
 
 	if (np->n_flag & (NACC | NUPD)) {
 		np->n_flag |= NCHG;
-		if (vp->v_usecount == 1 &&
+		if (vrefcnt(vp) == 1 &&
 		    (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
 			vattr_null(&vattr);
 			if (np->n_flag & NACC)
@@ -3527,7 +3527,7 @@ nfsfifo_close(void *v)
 		if (np->n_flag & NUPD)
 			np->n_mtim = ts;
 		np->n_flag |= NCHG;
-		if (vp->v_usecount == 1 &&
+		if (vrefcnt(vp) == 1 &&
 		    (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
 			vattr_null(&vattr);
 			if (np->n_flag & NACC)

Index: src/sys/rump/librump/rumpvfs/rump_vfs.c
diff -u src/sys/rump/librump/rumpvfs/rump_vfs.c:1.90 src/sys/rump/librump/rumpvfs/rump_vfs.c:1.91
--- src/sys/rump/librump/rumpvfs/rump_vfs.c:1.90	Sun Feb 23 15:46:42 2020
+++ src/sys/rump/librump/rumpvfs/rump_vfs.c	Mon Apr 13 19:23:20 2020
@@ -1,4 +1,4 @@
-/*	$NetBSD: rump_vfs.c,v 1.90 2020/02/23 15:46:42 ad Exp $	*/
+/*	$NetBSD: rump_vfs.c,v 1.91 2020/04/13 19:23:20 ad Exp $	*/
 
 /*
  * Copyright (c) 2008 Antti Kantee.  All Rights Reserved.
@@ -29,7 +29,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: rump_vfs.c,v 1.90 2020/02/23 15:46:42 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: rump_vfs.c,v 1.91 2020/04/13 19:23:20 ad Exp $");
 
 #include <sys/param.h>
 #include <sys/buf.h>
@@ -382,7 +382,7 @@ int
 rump_vp_getref(struct vnode *vp)
 {
 
-	return vp->v_usecount;
+	return vrefcnt(vp);
 }
 
 void

Index: src/sys/rump/librump/rumpvfs/rumpfs.c
diff -u src/sys/rump/librump/rumpvfs/rumpfs.c:1.155 src/sys/rump/librump/rumpvfs/rumpfs.c:1.156
--- src/sys/rump/librump/rumpvfs/rumpfs.c:1.155	Sat Apr  4 19:24:51 2020
+++ src/sys/rump/librump/rumpvfs/rumpfs.c	Mon Apr 13 19:23:20 2020
@@ -1,4 +1,4 @@
-/*	$NetBSD: rumpfs.c,v 1.155 2020/04/04 19:24:51 kamil Exp $	*/
+/*	$NetBSD: rumpfs.c,v 1.156 2020/04/13 19:23:20 ad Exp $	*/
 
 /*
  * Copyright (c) 2009, 2010, 2011 Antti Kantee.  All Rights Reserved.
@@ -26,7 +26,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: rumpfs.c,v 1.155 2020/04/04 19:24:51 kamil Exp $");
+__KERNEL_RCSID(0, "$NetBSD: rumpfs.c,v 1.156 2020/04/13 19:23:20 ad Exp $");
 
 #include <sys/param.h>
 #include <sys/atomic.h>
@@ -1906,7 +1906,7 @@ rumpfs_unmount(struct mount *mp, int mnt
 	if (panicstr || mntflags & MNT_FORCE)
 		flags |= FORCECLOSE;
 
-	if (rfsmp->rfsmp_rvp->v_usecount > 1 && (flags & FORCECLOSE) == 0)
+	if (vrefcnt(rfsmp->rfsmp_rvp) > 1 && (flags & FORCECLOSE) == 0)
 		return EBUSY;
 
 	if ((error = vflush(mp, rfsmp->rfsmp_rvp, flags)) != 0)

Index: src/sys/sys/vnode.h
diff -u src/sys/sys/vnode.h:1.294 src/sys/sys/vnode.h:1.295
--- src/sys/sys/vnode.h:1.294	Sun Mar 22 18:32:42 2020
+++ src/sys/sys/vnode.h	Mon Apr 13 19:23:20 2020
@@ -1,7 +1,7 @@
-/*	$NetBSD: vnode.h,v 1.294 2020/03/22 18:32:42 ad Exp $	*/
+/*	$NetBSD: vnode.h,v 1.295 2020/04/13 19:23:20 ad Exp $	*/
 
 /*-
- * Copyright (c) 2008 The NetBSD Foundation, Inc.
+ * Copyright (c) 2008, 2020 The NetBSD Foundation, Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -516,6 +516,7 @@ int	vdead_check(struct vnode *, int);
 void	vrevoke(struct vnode *);
 void	vremfree(struct vnode *);
 void	vshareilock(struct vnode *, struct vnode *);
+int	vrefcnt(struct vnode *);
 int	vcache_get(struct mount *, const void *, size_t, struct vnode **);
 int	vcache_new(struct mount *, struct vnode *,
 	    struct vattr *, kauth_cred_t, void *, struct vnode **);

Index: src/sys/ufs/lfs/lfs_vnops.c
diff -u src/sys/ufs/lfs/lfs_vnops.c:1.331 src/sys/ufs/lfs/lfs_vnops.c:1.332
--- src/sys/ufs/lfs/lfs_vnops.c:1.331	Sun Feb 23 15:46:42 2020
+++ src/sys/ufs/lfs/lfs_vnops.c	Mon Apr 13 19:23:20 2020
@@ -1,4 +1,4 @@
-/*	$NetBSD: lfs_vnops.c,v 1.331 2020/02/23 15:46:42 ad Exp $	*/
+/*	$NetBSD: lfs_vnops.c,v 1.332 2020/04/13 19:23:20 ad Exp $	*/
 
 /*-
  * Copyright (c) 1999, 2000, 2001, 2002, 2003 The NetBSD Foundation, Inc.
@@ -125,7 +125,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: lfs_vnops.c,v 1.331 2020/02/23 15:46:42 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: lfs_vnops.c,v 1.332 2020/04/13 19:23:20 ad Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_compat_netbsd.h"
@@ -1346,7 +1346,7 @@ lfs_close(void *v)
 	    vp->v_mount->mnt_iflag & IMNT_UNMOUNT)
 		return 0;
 
-	if (vp->v_usecount > 1 && vp != ip->i_lfs->lfs_ivnode) {
+	if (vrefcnt(vp) > 1 && vp != ip->i_lfs->lfs_ivnode) {
 		LFS_ITIMES(ip, NULL, NULL, NULL);
 	}
 	return (0);
@@ -1373,7 +1373,7 @@ lfsspec_close(void *v)
 	KASSERT(VOP_ISLOCKED(vp) == LK_EXCLUSIVE);
 
 	ip = VTOI(vp);
-	if (vp->v_usecount > 1) {
+	if (vrefcnt(vp) > 1) {
 		LFS_ITIMES(ip, NULL, NULL, NULL);
 	}
 	return (VOCALL (spec_vnodeop_p, VOFFSET(vop_close), ap));
@@ -1400,7 +1400,7 @@ lfsfifo_close(void *v)
 	KASSERT(VOP_ISLOCKED(vp) == LK_EXCLUSIVE);
 
 	ip = VTOI(vp);
-	if (ap->a_vp->v_usecount > 1) {
+	if (vrefcnt(ap->a_vp) > 1) {
 		LFS_ITIMES(ip, NULL, NULL, NULL);
 	}
 	return (VOCALL (fifo_vnodeop_p, VOFFSET(vop_close), ap));

Index: src/sys/ufs/mfs/mfs_vnops.c
diff -u src/sys/ufs/mfs/mfs_vnops.c:1.59 src/sys/ufs/mfs/mfs_vnops.c:1.60
--- src/sys/ufs/mfs/mfs_vnops.c:1.59	Wed Feb 20 10:03:55 2019
+++ src/sys/ufs/mfs/mfs_vnops.c	Mon Apr 13 19:23:20 2020
@@ -1,4 +1,4 @@
-/*	$NetBSD: mfs_vnops.c,v 1.59 2019/02/20 10:03:55 hannken Exp $	*/
+/*	$NetBSD: mfs_vnops.c,v 1.60 2020/04/13 19:23:20 ad Exp $	*/
 
 /*
  * Copyright (c) 1989, 1993
@@ -32,7 +32,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: mfs_vnops.c,v 1.59 2019/02/20 10:03:55 hannken Exp $");
+__KERNEL_RCSID(0, "$NetBSD: mfs_vnops.c,v 1.60 2020/04/13 19:23:20 ad Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -140,7 +140,7 @@ mfs_strategy(void *v)
 	struct buf *bp = ap->a_bp;
 	struct mfsnode *mfsp;
 
-	if (vp->v_type != VBLK || vp->v_usecount == 0)
+	if (vp->v_type != VBLK || vrefcnt(vp) == 0)
 		panic("mfs_strategy: bad dev");
 	mfsp = VTOMFS(vp);
 	/* check for mini-root access */

Index: src/sys/ufs/ufs/ufs_vnops.c
diff -u src/sys/ufs/ufs/ufs_vnops.c:1.250 src/sys/ufs/ufs/ufs_vnops.c:1.251
--- src/sys/ufs/ufs/ufs_vnops.c:1.250	Sat Apr  4 20:49:31 2020
+++ src/sys/ufs/ufs/ufs_vnops.c	Mon Apr 13 19:23:20 2020
@@ -1,4 +1,4 @@
-/*	$NetBSD: ufs_vnops.c,v 1.250 2020/04/04 20:49:31 ad Exp $	*/
+/*	$NetBSD: ufs_vnops.c,v 1.251 2020/04/13 19:23:20 ad Exp $	*/
 
 /*-
  * Copyright (c) 2008, 2020 The NetBSD Foundation, Inc.
@@ -66,7 +66,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ufs_vnops.c,v 1.250 2020/04/04 20:49:31 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ufs_vnops.c,v 1.251 2020/04/13 19:23:20 ad Exp $");
 
 #if defined(_KERNEL_OPT)
 #include "opt_ffs.h"
@@ -250,7 +250,7 @@ ufs_close(void *v)
 	struct vnode	*vp;
 
 	vp = ap->a_vp;
-	if (vp->v_usecount > 1)
+	if (vrefcnt(vp) > 1)
 		UFS_ITIMES(vp, NULL, NULL, NULL);
 	return (0);
 }
@@ -1669,7 +1669,7 @@ ufsspec_close(void *v)
 	struct vnode	*vp;
 
 	vp = ap->a_vp;
-	if (vp->v_usecount > 1)
+	if (vrefcnt(vp) > 1)
 		UFS_ITIMES(vp, NULL, NULL, NULL);
 	return (VOCALL (spec_vnodeop_p, VOFFSET(vop_close), ap));
 }
@@ -1730,7 +1730,7 @@ ufsfifo_close(void *v)
 	struct vnode	*vp;
 
 	vp = ap->a_vp;
-	if (ap->a_vp->v_usecount > 1)
+	if (vrefcnt(ap->a_vp) > 1)
 		UFS_ITIMES(vp, NULL, NULL, NULL);
 	return (VOCALL (fifo_vnodeop_p, VOFFSET(vop_close), ap));
 }

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