Remove VOP_LEASE and supporting functions. This hasn't been used since

the removal of NQNFS, but was left in in case it was required for NFSv4.
Since our new NFSv4 client and server can't use it for their
requirements, GC the old mechanism, as well as other unused lease-
related code and interfaces.

Due to its impact on kernel programming and binary interfaces, this
change should not be MFC'd.

Proposed by:    jeff
Reviewed by:    jeff
Discussed with: rmacklem, zach loafman @ isilon

22 files changed, 4 insertions, 124 deletions

diff --git a/sys/cddl/compat/opensolaris/sys/vnode.h b/sys/cddl/compat/opensolaris/sys/vnode.h
index 616e11a..68288a7 100644
--- a/sys/cddl/compat/opensolaris/sys/vnode.h
+++ b/sys/cddl/compat/opensolaris/sys/vnode.h
@@ -217,7 +217,6 @@ zfs_vn_rdwr(enum uio_rw rw, vnode_t *vp, caddr_t base, ssize_t len,
 	vfslocked = VFS_LOCK_GIANT(vp->v_mount);
 	if (rw == UIO_WRITE) {
 		ioflag = IO_SYNC;
-		VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
 	} else {
 		ioflag = IO_DIRECT;
 	}
diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c
index f213d10..7792f6e 100644
--- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c
+++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c
@@ -4577,7 +4577,6 @@ vop_deleteextattr {
 		ZFS_EXIT(zfsvfs);
 		return (error);
 	}
-	VOP_LEASE(nd.ni_dvp, td, ap->a_cred, LEASE_WRITE);
 	error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd);
 
 	vput(nd.ni_dvp);
@@ -4639,7 +4638,6 @@ vop_setextattr {
 		return (error);
 	}
 
-	VOP_LEASE(vp, td, ap->a_cred, LEASE_WRITE);
 	VATTR_NULL(&va);
 	va.va_size = 0;
 	error = VOP_SETATTR(vp, &va, ap->a_cred);
diff --git a/sys/fs/devfs/devfs_vnops.c b/sys/fs/devfs/devfs_vnops.c
index b890da7..215f943 100644
--- a/sys/fs/devfs/devfs_vnops.c
+++ b/sys/fs/devfs/devfs_vnops.c
@@ -1549,7 +1549,6 @@ static struct vop_vector devfs_specops = {
 	.vop_create =		VOP_PANIC,
 	.vop_fsync =		devfs_fsync,
 	.vop_getattr =		devfs_getattr,
-	.vop_lease =		VOP_NULL,
 	.vop_link =		VOP_PANIC,
 	.vop_mkdir =		VOP_PANIC,
 	.vop_mknod =		VOP_PANIC,
diff --git a/sys/fs/fifofs/fifo_vnops.c b/sys/fs/fifofs/fifo_vnops.c
index c8bc5ab4..66963bc 100644
--- a/sys/fs/fifofs/fifo_vnops.c
+++ b/sys/fs/fifofs/fifo_vnops.c
@@ -118,7 +118,6 @@ struct vop_vector fifo_specops = {
 	.vop_getattr =		VOP_EBADF,
 	.vop_ioctl =		fifo_ioctl,
 	.vop_kqfilter =		fifo_kqfilter,
-	.vop_lease =		VOP_NULL,
 	.vop_link =		VOP_PANIC,
 	.vop_mkdir =		VOP_PANIC,
 	.vop_mknod =		VOP_PANIC,
diff --git a/sys/fs/unionfs/union_subr.c b/sys/fs/unionfs/union_subr.c
index beaef2f..69165e3 100644
--- a/sys/fs/unionfs/union_subr.c
+++ b/sys/fs/unionfs/union_subr.c
@@ -805,10 +805,6 @@ unionfs_mkshadowdir(struct unionfs_mount *ump, struct vnode *udvp,
 
 	if ((error = vn_start_write(udvp, &mp, V_WAIT | PCATCH)))
 		goto unionfs_mkshadowdir_free_out;
-	if ((error = VOP_LEASE(udvp, td, cn.cn_cred, LEASE_WRITE))) {
-		vn_finished_write(mp);
-		goto unionfs_mkshadowdir_free_out;
-	}
 	unionfs_create_uppervattr_core(ump, &lva, &va, td);
 
 	error = VOP_MKDIR(udvp, &uvp, &cn, &va);
@@ -874,8 +870,7 @@ unionfs_mkwhiteout(struct vnode *dvp, struct componentname *cnp,
 
 	if ((error = vn_start_write(dvp, &mp, V_WAIT | PCATCH)))
 		goto unionfs_mkwhiteout_free_out;
-	if (!(error = VOP_LEASE(dvp, td, td->td_ucred, LEASE_WRITE)))
-		error = VOP_WHITEOUT(dvp, &cn, CREATE);
+	error = VOP_WHITEOUT(dvp, &cn, CREATE);
 
 	vn_finished_write(mp);
 
@@ -949,9 +944,6 @@ unionfs_vn_create_on_upper(struct vnode **vpp, struct vnode *udvp,
 		goto unionfs_vn_create_on_upper_free_out1;
 	}
 
-	if ((error = VOP_LEASE(udvp, td, cred, LEASE_WRITE)) != 0)
-		goto unionfs_vn_create_on_upper_free_out1;
-
 	if ((error = VOP_CREATE(udvp, &vp, &cn, uvap)) != 0)
 		goto unionfs_vn_create_on_upper_free_out1;
 
@@ -999,10 +991,6 @@ unionfs_copyfile_core(struct vnode *lvp, struct vnode *uvp,
 	uio.uio_segflg = UIO_SYSSPACE;
 	uio.uio_offset = 0;
 
-	if ((error = VOP_LEASE(lvp, td, cred, LEASE_READ)) != 0)
-		return (error);
-	if ((error = VOP_LEASE(uvp, td, cred, LEASE_WRITE)) != 0)
-		return (error);
 	buf = malloc(MAXBSIZE, M_TEMP, M_WAITOK);
 
 	while (error == 0) {
diff --git a/sys/fs/unionfs/union_vnops.c b/sys/fs/unionfs/union_vnops.c
index d16851d..8505cac 100644
--- a/sys/fs/unionfs/union_vnops.c
+++ b/sys/fs/unionfs/union_vnops.c
@@ -902,27 +902,6 @@ unionfs_write(struct vop_write_args *ap)
 }
 
 static int
-unionfs_lease(struct vop_lease_args *ap)
-{
-	int error;
-	struct unionfs_node *unp;
-	struct vnode   *vp;
-
-	UNIONFS_INTERNAL_DEBUG("unionfs_lease: enter\n");
-
-	KASSERT_UNIONFS_VNODE(ap->a_vp);
-
-	unp = VTOUNIONFS(ap->a_vp);
-	vp = (unp->un_uppervp != NULLVP ? unp->un_uppervp : unp->un_lowervp);
-
-	error = VOP_LEASE(vp, ap->a_td, ap->a_cred, ap->a_flag);
-
-	UNIONFS_INTERNAL_DEBUG("unionfs_lease: lease (%d)\n", error);
-
-	return (error);
-}
-
-static int
 unionfs_ioctl(struct vop_ioctl_args *ap)
 {
 	int error;
@@ -947,7 +926,7 @@ unionfs_ioctl(struct vop_ioctl_args *ap)
 	error = VOP_IOCTL(ovp, ap->a_command, ap->a_data, ap->a_fflag,
 	    ap->a_cred, ap->a_td);
 
-	UNIONFS_INTERNAL_DEBUG("unionfs_ioctl: lease (%d)\n", error);
+	UNIONFS_INTERNAL_DEBUG("unionfs_ioctl: leave (%d)\n", error);
 
 	return (error);
 }
@@ -2461,7 +2440,6 @@ struct vop_vector unionfs_vnodeops = {
 	.vop_getwritemount =	unionfs_getwritemount,
 	.vop_inactive =		unionfs_inactive,
 	.vop_ioctl =		unionfs_ioctl,
-	.vop_lease =		unionfs_lease,
 	.vop_link =		unionfs_link,
 	.vop_listextattr =	unionfs_listextattr,
 	.vop_lock1 =		unionfs_lock,
diff --git a/sys/kern/kern_acct.c b/sys/kern/kern_acct.c
index d45e3b7..8355ca5 100644
--- a/sys/kern/kern_acct.c
+++ b/sys/kern/kern_acct.c
@@ -436,7 +436,6 @@ acct_process(struct thread *td)
 	 * Write the accounting information to the file.
 	 */
 	vfslocked = VFS_LOCK_GIANT(acct_vp->v_mount);
-	VOP_LEASE(acct_vp, td, acct_cred, LEASE_WRITE);
 	ret = vn_rdwr(UIO_WRITE, acct_vp, (caddr_t)&acct, sizeof (acct),
 	    (off_t)0, UIO_SYSSPACE, IO_APPEND|IO_UNIT, acct_cred, NOCRED,
 	    (int *)0, td);
diff --git a/sys/kern/kern_alq.c b/sys/kern/kern_alq.c
index 512f358..9f37244 100644
--- a/sys/kern/kern_alq.c
+++ b/sys/kern/kern_alq.c
@@ -293,7 +293,6 @@ alq_doio(struct alq *alq)
 	vfslocked = VFS_LOCK_GIANT(vp->v_mount);
 	vn_start_write(vp, &mp, V_WAIT);
 	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
-	VOP_LEASE(vp, td, alq->aq_cred, LEASE_WRITE);
 	/*
 	 * XXX: VOP_WRITE error checks are ignored.
 	 */
diff --git a/sys/kern/kern_ktrace.c b/sys/kern/kern_ktrace.c
index 6ccf2c0..6e680fb 100644
--- a/sys/kern/kern_ktrace.c
+++ b/sys/kern/kern_ktrace.c
@@ -992,7 +992,6 @@ ktr_writerequest(struct thread *td, struct ktr_request *req)
 	vfslocked = VFS_LOCK_GIANT(vp->v_mount);
 	vn_start_write(vp, &mp, V_WAIT);
 	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
-	(void)VOP_LEASE(vp, td, cred, LEASE_WRITE);
 #ifdef MAC
 	error = mac_vnode_check_write(cred, NOCRED, vp);
 	if (error == 0)
diff --git a/sys/kern/kern_sig.c b/sys/kern/kern_sig.c
index 7460c13..5c1d553 100644
--- a/sys/kern/kern_sig.c
+++ b/sys/kern/kern_sig.c
@@ -2984,7 +2984,6 @@ restart:
 	if (set_core_nodump_flag)
 		vattr.va_flags = UF_NODUMP;
 	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
-	VOP_LEASE(vp, td, cred, LEASE_WRITE);
 	VOP_SETATTR(vp, &vattr, cred);
 	VOP_UNLOCK(vp, 0);
 	vn_finished_write(mp);
diff --git a/sys/kern/kern_time.c b/sys/kern/kern_time.c
index 99c1a53..3aea2bd 100644
--- a/sys/kern/kern_time.c
+++ b/sys/kern/kern_time.c
@@ -74,7 +74,6 @@ static uma_zone_t	itimer_zone = NULL;
 
 static int	settime(struct thread *, struct timeval *);
 static void	timevalfix(struct timeval *);
-static void	no_lease_updatetime(int);
 
 static void	itimer_start(void);
 static int	itimer_init(void *, int, int);
@@ -106,14 +105,6 @@ int		itimespecfix(struct timespec *ts);
 SYSINIT(posix_timer, SI_SUB_P1003_1B, SI_ORDER_FIRST+4, itimer_start, NULL);
 
 
-static void 
-no_lease_updatetime(deltat)
-	int deltat;
-{
-}
-
-void (*lease_updatetime)(int)  = no_lease_updatetime;
-
 static int
 settime(struct thread *td, struct timeval *tv)
 {
@@ -168,9 +159,6 @@ settime(struct thread *td, struct timeval *tv)
 	ts.tv_nsec = tv->tv_usec * 1000;
 	mtx_lock(&Giant);
 	tc_setclock(&ts);
-	(void) splsoftclock();
-	lease_updatetime(delta.tv_sec);
-	splx(s);
 	resettodr();
 	mtx_unlock(&Giant);
 	return (0);
diff --git a/sys/kern/uipc_usrreq.c b/sys/kern/uipc_usrreq.c
index 517784a..6ddc837 100644
--- a/sys/kern/uipc_usrreq.c
+++ b/sys/kern/uipc_usrreq.c
@@ -457,10 +457,8 @@ restart:
 	error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
 	    &vattr);
 #endif
-	if (error == 0) {
-		VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
+	if (error == 0)
 		error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
-	}
 	NDFREE(&nd, NDF_ONLY_PNBUF);
 	vput(nd.ni_dvp);
 	if (error) {
diff --git a/sys/kern/vfs_acl.c b/sys/kern/vfs_acl.c
index 760b0e7..6a7c461 100644
--- a/sys/kern/vfs_acl.c
+++ b/sys/kern/vfs_acl.c
@@ -91,7 +91,6 @@ vacl_set_acl(struct thread *td, struct vnode *vp, acl_type_t type,
 	error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
 	if (error != 0)
 		return (error);
-	VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
 	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
 #ifdef MAC
 	error = mac_vnode_check_setacl(td->td_ucred, vp, type, &inkernacl);
@@ -117,7 +116,6 @@ vacl_get_acl(struct thread *td, struct vnode *vp, acl_type_t type,
 	struct acl inkernelacl;
 	int error;
 
-	VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
 	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
 #ifdef MAC
 	error = mac_vnode_check_getacl(td->td_ucred, vp, type);
@@ -146,7 +144,6 @@ vacl_delete(struct thread *td, struct vnode *vp, acl_type_t type)
 	error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
 	if (error)
 		return (error);
-	VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
 	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
 #ifdef MAC
 	error = mac_vnode_check_deleteacl(td->td_ucred, vp, type);
diff --git a/sys/kern/vfs_default.c b/sys/kern/vfs_default.c
index 1001497..2fe64b3 100644
--- a/sys/kern/vfs_default.c
+++ b/sys/kern/vfs_default.c
@@ -98,7 +98,6 @@ struct vop_vector default_vnodeops = {
 	.vop_ioctl =		VOP_ENOTTY,
 	.vop_kqfilter =		vop_stdkqfilter,
 	.vop_islocked =		vop_stdislocked,
-	.vop_lease =		VOP_NULL,
 	.vop_lock1 =		vop_stdlock,
 	.vop_lookup =		vop_nolookup,
 	.vop_open =		VOP_NULL,
diff --git a/sys/kern/vfs_extattr.c b/sys/kern/vfs_extattr.c
index c8b59d9..18890b7 100644
--- a/sys/kern/vfs_extattr.c
+++ b/sys/kern/vfs_extattr.c
@@ -175,7 +175,6 @@ extattr_set_vp(struct vnode *vp, int attrnamespace, const char *attrname,
 	error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
 	if (error)
 		return (error);
-	VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
 	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
 
 	aiov.iov_base = data;
@@ -341,7 +340,6 @@ extattr_get_vp(struct vnode *vp, int attrnamespace, const char *attrname,
 	int error;
 
 	VFS_ASSERT_GIANT(vp->v_mount);
-	VOP_LEASE(vp, td, td->td_ucred, LEASE_READ);
 	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
 
 	/*
@@ -522,7 +520,6 @@ extattr_delete_vp(struct vnode *vp, int attrnamespace, const char *attrname,
 	error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
 	if (error)
 		return (error);
-	VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
 	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
 
 #ifdef MAC
@@ -664,7 +661,6 @@ extattr_list_vp(struct vnode *vp, int attrnamespace, void *data,
 	int error;
 
 	VFS_ASSERT_GIANT(vp->v_mount);
-	VOP_LEASE(vp, td, td->td_ucred, LEASE_READ);
 	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
 
 	auiop = NULL;
diff --git a/sys/kern/vfs_syscalls.c b/sys/kern/vfs_syscalls.c
index ad69698..202f2d1 100644
--- a/sys/kern/vfs_syscalls.c
+++ b/sys/kern/vfs_syscalls.c
@@ -1161,7 +1161,6 @@ kern_openat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
 	if (flags & O_TRUNC) {
 		if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
 			goto bad;
-		VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
 		VATTR_NULL(&vat);
 		vat.va_size = 0;
 		vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
@@ -1353,7 +1352,6 @@ restart:
 		    &nd.ni_cnd, &vattr);
 #endif
 	if (!error) {
-		VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
 		if (whiteout)
 			error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE);
 		else {
@@ -1460,7 +1458,6 @@ restart:
 	if (error)
 		goto out;
 #endif
-	VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
 	error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
 	if (error == 0)
 		vput(nd.ni_vp);
@@ -1606,8 +1603,6 @@ kern_linkat(struct thread *td, int fd1, int fd2, char *path1, char *path2,
 			error = EEXIST;
 		} else if ((error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY))
 		    == 0) {
-			VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
-			VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
 			error = can_hardlink(vp, td->td_ucred);
 			if (error == 0)
 #ifdef MAC
@@ -1727,7 +1722,6 @@ restart:
 	if (error)
 		goto out2;
 #endif
-	VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
 	error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath);
 	if (error == 0)
 		vput(nd.ni_vp);
@@ -1787,7 +1781,6 @@ restart:
 			return (error);
 		goto restart;
 	}
-	VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
 	error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE);
 	NDFREE(&nd, NDF_ONLY_PNBUF);
 	vput(nd.ni_dvp);
@@ -1893,7 +1886,6 @@ restart:
 		if (error)
 			goto out;
 #endif
-		VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
 		error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd);
 #ifdef MAC
 out:
@@ -2667,7 +2659,6 @@ setfflags(td, vp, flags)
 
 	if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
 		return (error);
-	VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
 	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
 	VATTR_NULL(&vattr);
 	vattr.va_flags = flags;
@@ -2795,7 +2786,6 @@ setfmode(td, vp, mode)
 
 	if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
 		return (error);
-	VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
 	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
 	VATTR_NULL(&vattr);
 	vattr.va_mode = mode & ALLPERMS;
@@ -2958,7 +2948,6 @@ setfown(td, vp, uid, gid)
 
 	if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
 		return (error);
-	VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
 	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
 	VATTR_NULL(&vattr);
 	vattr.va_uid = uid;
@@ -3172,7 +3161,6 @@ setutimes(td, vp, ts, numtimes, nullflag)
 
 	if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
 		return (error);
-	VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
 	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
 	setbirthtime = 0;
 	if (numtimes < 3 && !VOP_GETATTR(vp, &vattr, td->td_ucred) &&
@@ -3403,7 +3391,6 @@ kern_truncate(struct thread *td, char *path, enum uio_seg pathseg, off_t length)
 		return (error);
 	}
 	NDFREE(&nd, NDF_ONLY_PNBUF);
-	VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
 	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
 	if (vp->v_type == VDIR)
 		error = EISDIR;
@@ -3647,13 +3634,6 @@ kern_renameat(struct thread *td, int oldfd, char *old, int newfd, char *new,
 #endif
 out:
 	if (!error) {
-		VOP_LEASE(tdvp, td, td->td_ucred, LEASE_WRITE);
-		if (fromnd.ni_dvp != tdvp) {
-			VOP_LEASE(fromnd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
-		}
-		if (tvp) {
-			VOP_LEASE(tvp, td, td->td_ucred, LEASE_WRITE);
-		}
 		error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd,
 				   tond.ni_dvp, tond.ni_vp, &tond.ni_cnd);
 		NDFREE(&fromnd, NDF_ONLY_PNBUF);
@@ -3779,7 +3759,6 @@ restart:
 	if (error)
 		goto out;
 #endif
-	VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
 	error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
 #ifdef MAC
 out:
@@ -3872,8 +3851,6 @@ restart:
 			return (error);
 		goto restart;
 	}
-	VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
-	VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
 	error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
 	vn_finished_write(mp);
 out:
@@ -4462,7 +4439,6 @@ fhopen(td, uap)
 			vrele(vp);
 			goto out;
 		}
-		VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
 		vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);	/* XXX */
 #ifdef MAC
 		/*
diff --git a/sys/kern/vfs_vnops.c b/sys/kern/vfs_vnops.c
index 681c0eb..48a74ac 100644
--- a/sys/kern/vfs_vnops.c
+++ b/sys/kern/vfs_vnops.c
@@ -153,14 +153,10 @@ restart:
 #ifdef MAC
 			error = mac_vnode_check_create(cred, ndp->ni_dvp,
 			    &ndp->ni_cnd, vap);
-			if (error == 0) {
+			if (error == 0)
 #endif
-				VOP_LEASE(ndp->ni_dvp, td, cred, LEASE_WRITE);
 				error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp,
 						   &ndp->ni_cnd, vap);
-#ifdef MAC
-			}
-#endif
 			vput(ndp->ni_dvp);
 			vn_finished_write(mp);
 			if (error) {
@@ -521,7 +517,6 @@ vn_read(fp, uio, active_cred, flags, td)
 	if (fp->f_flag & O_DIRECT)
 		ioflag |= IO_DIRECT;
 	vfslocked = VFS_LOCK_GIANT(vp->v_mount);
-	VOP_LEASE(vp, td, fp->f_cred, LEASE_READ);
 	/*
 	 * According to McKusick the vn lock was protecting f_offset here.
 	 * It is now protected by the FOFFSET_LOCKED flag.
@@ -598,7 +593,6 @@ vn_write(fp, uio, active_cred, flags, td)
 	if (vp->v_type != VCHR &&
 	    (error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
 		goto unlock;
-	VOP_LEASE(vp, td, fp->f_cred, LEASE_WRITE);
 	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
 	if ((flags & FOF_OFFSET) == 0)
 		uio->uio_offset = fp->f_offset;
@@ -642,7 +636,6 @@ vn_truncate(fp, length, active_cred, td)
 		VFS_UNLOCK_GIANT(vfslocked);
 		return (error);
 	}
-	VOP_LEASE(vp, td, active_cred, LEASE_WRITE);
 	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
 	if (vp->v_type == VDIR) {
 		error = EISDIR;
diff --git a/sys/kern/vnode_if.src b/sys/kern/vnode_if.src
index 0e198bf..b7d9cb1 100644
--- a/sys/kern/vnode_if.src
+++ b/sys/kern/vnode_if.src
@@ -199,16 +199,6 @@ vop_write {
 };
 
 
-%% lease	vp	= = =
-
-vop_lease {
-	IN struct vnode *vp;
-	IN struct thread *td;
-	IN struct ucred *cred;
-	IN int flag;
-};
-
-
 %% ioctl	vp	U U U
 
 vop_ioctl {
diff --git a/sys/nfs4client/nfs4_vnops.c b/sys/nfs4client/nfs4_vnops.c
index acfd318..af85494 100644
--- a/sys/nfs4client/nfs4_vnops.c
+++ b/sys/nfs4client/nfs4_vnops.c
@@ -173,7 +173,6 @@ struct vop_vector nfs4_vnodeops = {
 	.vop_getpages =		nfs_getpages,
 	.vop_putpages =		nfs_putpages,
 	.vop_inactive =		nfs_inactive,
-	.vop_lease =		VOP_NULL,
 	.vop_link =		nfs4_link,
 	.vop_lookup =		nfs4_lookup,
 	.vop_mkdir =		nfs4_mkdir,
diff --git a/sys/nfsclient/nfs_vnops.c b/sys/nfsclient/nfs_vnops.c
index b363429..2093b3f 100644
--- a/sys/nfsclient/nfs_vnops.c
+++ b/sys/nfsclient/nfs_vnops.c
@@ -168,7 +168,6 @@ struct vop_vector nfs_vnodeops = {
 	.vop_getpages =		nfs_getpages,
 	.vop_putpages =		nfs_putpages,
 	.vop_inactive =		nfs_inactive,
-	.vop_lease =		VOP_NULL,
 	.vop_link =		nfs_link,
 	.vop_lookup =		nfs_lookup,
 	.vop_mkdir =		nfs_mkdir,
diff --git a/sys/sys/vnode.h b/sys/sys/vnode.h
index 2ad3eae..0a3d1dc 100644
--- a/sys/sys/vnode.h
+++ b/sys/sys/vnode.h
@@ -412,14 +412,6 @@ extern	struct uma_zone *namei_zone;
 extern	int prtactive;			/* nonzero to call vprint() */
 extern	struct vattr va_null;		/* predefined null vattr structure */
 
-/*
- * Macro/function to check for client cache inconsistency w.r.t. leasing.
- */
-#define	LEASE_READ	0x1		/* Check lease for readers */
-#define	LEASE_WRITE	0x2		/* Check lease for modifiers */
-
-extern void	(*lease_updatetime)(int deltat);
-
 #define	VI_LOCK(vp)	mtx_lock(&(vp)->v_interlock)
 #define	VI_LOCK_FLAGS(vp, flags) mtx_lock_flags(&(vp)->v_interlock, (flags))
 #define	VI_TRYLOCK(vp)	mtx_trylock(&(vp)->v_interlock)
@@ -587,8 +579,6 @@ struct uio;
 struct vattr;
 struct vnode;
 
-extern int	(*lease_check_hook)(struct vop_lease_args *);
-
 /* cache_* may belong in namei.h. */
 void	cache_enter(struct vnode *dvp, struct vnode *vp,
 	    struct componentname *cnp);
@@ -607,7 +597,6 @@ int	insmntque1(struct vnode *vp, struct mount *mp,
 	    void (*dtr)(struct vnode *, void *), void *dtr_arg);
 int	insmntque(struct vnode *vp, struct mount *mp);
 u_quad_t init_va_filerev(void);
-int	lease_check(struct vop_lease_args *ap);
 int	speedup_syncer(void);
 #define textvp_fullpath(p, rb, rfb) \
 	vn_fullpath(FIRST_THREAD_IN_PROC(p), (p)->p_textvp, rb, rfb)
diff --git a/sys/ufs/ffs/ffs_snapshot.c b/sys/ufs/ffs/ffs_snapshot.c
index b45532e..a6e73f5 100644
--- a/sys/ufs/ffs/ffs_snapshot.c
+++ b/sys/ufs/ffs/ffs_snapshot.c
@@ -278,7 +278,6 @@ restart:
 			return (error);
 		goto restart;
 	}
-	VOP_LEASE(nd.ni_dvp, td, KERNCRED, LEASE_WRITE);
 	error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vat);
 	VOP_UNLOCK(nd.ni_dvp, 0);
 	if (error) {