 @@ -1,3661 +0,0 @@
 /*	$NetBSD: nfs_vnops.c,v 1.268 2008/11/19 18:36:10 ad Exp $	*/
 /*
  * Copyright (c) 1989, 1993
  *	The Regents of the University of California.  All rights reserved.
  * This code is derived from software contributed to Berkeley by
  * Rick Macklem at The University of Guelph.
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  * 3. Neither the name of the University nor the names of its contributors
  *    may be used to endorse or promote products derived from this software
  *    without specific prior written permission.
  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *	@(#)nfs_vnops.c	8.19 (Berkeley) 7/31/95
  */
 /*
  * vnode op calls for Sun NFS version 2 and 3
  */
 #include <sys/cdefs.h>
 __KERNEL_RCSID(0, "$NetBSD: nfs_vnops.c,v 1.268 2008/11/19 18:36:10 ad Exp $");
 #ifdef _KERNEL_OPT
 #include "opt_nfs.h"
 #include "opt_uvmhist.h"
 #endif
 #include <sys/param.h>
 #include <sys/proc.h>
 #include <sys/kernel.h>
 #include <sys/systm.h>
 #include <sys/resourcevar.h>
 #include <sys/mount.h>
 #include <sys/buf.h>
 #include <sys/condvar.h>
 #include <sys/disk.h>
 #include <sys/malloc.h>
 #include <sys/kmem.h>
 #include <sys/mbuf.h>
 #include <sys/mutex.h>
 #include <sys/namei.h>
 #include <sys/vnode.h>
 #include <sys/dirent.h>
 #include <sys/fcntl.h>
 #include <sys/hash.h>
 #include <sys/lockf.h>
 #include <sys/stat.h>
 #include <sys/unistd.h>
 #include <sys/kauth.h>
 #include <uvm/uvm_extern.h>
 #include <uvm/uvm.h>
 #include <miscfs/fifofs/fifo.h>
 #include <miscfs/genfs/genfs.h>
 #include <miscfs/genfs/genfs_node.h>
 #include <miscfs/specfs/specdev.h>
 #include <nfs/rpcv2.h>
 #include <nfs/nfsproto.h>
 #include <nfs/nfs.h>
 #include <nfs/nfsnode.h>
 #include <nfs/nfsmount.h>
 #include <nfs/xdr_subs.h>
 #include <nfs/nfsm_subs.h>
 #include <nfs/nfs_var.h>
 #include <net/if.h>
 #include <netinet/in.h>
 #include <netinet/in_var.h>
 /*
  * Global vfs data structures for nfs
  */
 int (**nfsv2_vnodeop_p) __P((void *));
 const struct vnodeopv_entry_desc nfsv2_vnodeop_entries[] = {
 	{ &vop_default_desc, vn_default_error },
 	{ &vop_lookup_desc, nfs_lookup },		/* lookup */
 	{ &vop_create_desc, nfs_create },		/* create */
 	{ &vop_mknod_desc, nfs_mknod },			/* mknod */
 	{ &vop_open_desc, nfs_open },			/* open */
 	{ &vop_close_desc, nfs_close },			/* close */
 	{ &vop_access_desc, nfs_access },		/* access */
 	{ &vop_getattr_desc, nfs_getattr },		/* getattr */
 	{ &vop_setattr_desc, nfs_setattr },		/* setattr */
 	{ &vop_read_desc, nfs_read },			/* read */
 	{ &vop_write_desc, nfs_write },			/* write */
 	{ &vop_fcntl_desc, genfs_fcntl },		/* fcntl */
 	{ &vop_ioctl_desc, nfs_ioctl },			/* ioctl */
 	{ &vop_poll_desc, nfs_poll },			/* poll */
 	{ &vop_kqfilter_desc, nfs_kqfilter },		/* kqfilter */
 	{ &vop_revoke_desc, nfs_revoke },		/* revoke */
 	{ &vop_mmap_desc, nfs_mmap },			/* mmap */
 	{ &vop_fsync_desc, nfs_fsync },			/* fsync */
 	{ &vop_seek_desc, nfs_seek },			/* seek */
 	{ &vop_remove_desc, nfs_remove },		/* remove */
 	{ &vop_link_desc, nfs_link },			/* link */
 	{ &vop_rename_desc, nfs_rename },		/* rename */
 	{ &vop_mkdir_desc, nfs_mkdir },			/* mkdir */
 	{ &vop_rmdir_desc, nfs_rmdir },			/* rmdir */
 	{ &vop_symlink_desc, nfs_symlink },		/* symlink */
 	{ &vop_readdir_desc, nfs_readdir },		/* readdir */
 	{ &vop_readlink_desc, nfs_readlink },		/* readlink */
 	{ &vop_abortop_desc, nfs_abortop },		/* abortop */
 	{ &vop_inactive_desc, nfs_inactive },		/* inactive */
 	{ &vop_reclaim_desc, nfs_reclaim },		/* reclaim */
 	{ &vop_lock_desc, nfs_lock },			/* lock */
 	{ &vop_unlock_desc, nfs_unlock },		/* unlock */
 	{ &vop_bmap_desc, nfs_bmap },			/* bmap */
 	{ &vop_strategy_desc, nfs_strategy },		/* strategy */
 	{ &vop_print_desc, nfs_print },			/* print */
 	{ &vop_islocked_desc, nfs_islocked },		/* islocked */
 	{ &vop_pathconf_desc, nfs_pathconf },		/* pathconf */
 	{ &vop_advlock_desc, nfs_advlock },		/* advlock */
 	{ &vop_bwrite_desc, genfs_badop },		/* bwrite */
 	{ &vop_getpages_desc, nfs_getpages },		/* getpages */
 	{ &vop_putpages_desc, genfs_putpages },		/* putpages */
 	{ NULL, NULL }
 };
 const struct vnodeopv_desc nfsv2_vnodeop_opv_desc =
 	{ &nfsv2_vnodeop_p, nfsv2_vnodeop_entries };
 /*
  * Special device vnode ops
  */
 int (**spec_nfsv2nodeop_p) __P((void *));
 const struct vnodeopv_entry_desc spec_nfsv2nodeop_entries[] = {
 	{ &vop_default_desc, vn_default_error },
 	{ &vop_lookup_desc, spec_lookup },		/* lookup */
 	{ &vop_create_desc, spec_create },		/* create */
 	{ &vop_mknod_desc, spec_mknod },		/* mknod */
 	{ &vop_open_desc, spec_open },			/* open */
 	{ &vop_close_desc, nfsspec_close },		/* close */
 	{ &vop_access_desc, nfsspec_access },		/* access */
 	{ &vop_getattr_desc, nfs_getattr },		/* getattr */
 	{ &vop_setattr_desc, nfs_setattr },		/* setattr */
 	{ &vop_read_desc, nfsspec_read },		/* read */
 	{ &vop_write_desc, nfsspec_write },		/* write */
 	{ &vop_fcntl_desc, genfs_fcntl },		/* fcntl */
 	{ &vop_ioctl_desc, spec_ioctl },		/* ioctl */
 	{ &vop_poll_desc, spec_poll },			/* poll */
 	{ &vop_kqfilter_desc, spec_kqfilter },		/* kqfilter */
 	{ &vop_revoke_desc, spec_revoke },		/* revoke */
 	{ &vop_mmap_desc, spec_mmap },			/* mmap */
 	{ &vop_fsync_desc, spec_fsync },		/* fsync */
 	{ &vop_seek_desc, spec_seek },			/* seek */
 	{ &vop_remove_desc, spec_remove },		/* remove */
 	{ &vop_link_desc, spec_link },			/* link */
 	{ &vop_rename_desc, spec_rename },		/* rename */
 	{ &vop_mkdir_desc, spec_mkdir },		/* mkdir */
 	{ &vop_rmdir_desc, spec_rmdir },		/* rmdir */
 	{ &vop_symlink_desc, spec_symlink },		/* symlink */
 	{ &vop_readdir_desc, spec_readdir },		/* readdir */
 	{ &vop_readlink_desc, spec_readlink },		/* readlink */
 	{ &vop_abortop_desc, spec_abortop },		/* abortop */
 	{ &vop_inactive_desc, nfs_inactive },		/* inactive */
 	{ &vop_reclaim_desc, nfs_reclaim },		/* reclaim */
 	{ &vop_lock_desc, nfs_lock },			/* lock */
 	{ &vop_unlock_desc, nfs_unlock },		/* unlock */
 	{ &vop_bmap_desc, spec_bmap },			/* bmap */
 	{ &vop_strategy_desc, spec_strategy },		/* strategy */
 	{ &vop_print_desc, nfs_print },			/* print */
 	{ &vop_islocked_desc, nfs_islocked },		/* islocked */
 	{ &vop_pathconf_desc, spec_pathconf },		/* pathconf */
 	{ &vop_advlock_desc, spec_advlock },		/* advlock */
 	{ &vop_bwrite_desc, spec_bwrite },		/* bwrite */
 	{ &vop_getpages_desc, spec_getpages },		/* getpages */
 	{ &vop_putpages_desc, spec_putpages },		/* putpages */
 	{ NULL, NULL }
 };
 const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc =
 	{ &spec_nfsv2nodeop_p, spec_nfsv2nodeop_entries };
 int (**fifo_nfsv2nodeop_p) __P((void *));
 const struct vnodeopv_entry_desc fifo_nfsv2nodeop_entries[] = {
 	{ &vop_default_desc, vn_default_error },
 	{ &vop_lookup_desc, fifo_lookup },		/* lookup */
 	{ &vop_create_desc, fifo_create },		/* create */
 	{ &vop_mknod_desc, fifo_mknod },		/* mknod */
 	{ &vop_open_desc, fifo_open },			/* open */
 	{ &vop_close_desc, nfsfifo_close },		/* close */
 	{ &vop_access_desc, nfsspec_access },		/* access */
 	{ &vop_getattr_desc, nfs_getattr },		/* getattr */
 	{ &vop_setattr_desc, nfs_setattr },		/* setattr */
 	{ &vop_read_desc, nfsfifo_read },		/* read */
 	{ &vop_write_desc, nfsfifo_write },		/* write */
 	{ &vop_fcntl_desc, genfs_fcntl },		/* fcntl */
 	{ &vop_ioctl_desc, fifo_ioctl },		/* ioctl */
 	{ &vop_poll_desc, fifo_poll },			/* poll */
 	{ &vop_kqfilter_desc, fifo_kqfilter },		/* kqfilter */
 	{ &vop_revoke_desc, fifo_revoke },		/* revoke */
 	{ &vop_mmap_desc, fifo_mmap },			/* mmap */
 	{ &vop_fsync_desc, nfs_fsync },			/* fsync */
 	{ &vop_seek_desc, fifo_seek },			/* seek */
 	{ &vop_remove_desc, fifo_remove },		/* remove */
 	{ &vop_link_desc, fifo_link },			/* link */
 	{ &vop_rename_desc, fifo_rename },		/* rename */
 	{ &vop_mkdir_desc, fifo_mkdir },		/* mkdir */
 	{ &vop_rmdir_desc, fifo_rmdir },		/* rmdir */
 	{ &vop_symlink_desc, fifo_symlink },		/* symlink */
 	{ &vop_readdir_desc, fifo_readdir },		/* readdir */
 	{ &vop_readlink_desc, fifo_readlink },		/* readlink */
 	{ &vop_abortop_desc, fifo_abortop },		/* abortop */
 	{ &vop_inactive_desc, nfs_inactive },		/* inactive */
 	{ &vop_reclaim_desc, nfs_reclaim },		/* reclaim */
 	{ &vop_lock_desc, nfs_lock },			/* lock */
 	{ &vop_unlock_desc, nfs_unlock },		/* unlock */
 	{ &vop_bmap_desc, fifo_bmap },			/* bmap */
 	{ &vop_strategy_desc, genfs_badop },		/* strategy */
 	{ &vop_print_desc, nfs_print },			/* print */
 	{ &vop_islocked_desc, nfs_islocked },		/* islocked */
 	{ &vop_pathconf_desc, fifo_pathconf },		/* pathconf */
 	{ &vop_advlock_desc, fifo_advlock },		/* advlock */
 	{ &vop_bwrite_desc, genfs_badop },		/* bwrite */
 	{ &vop_putpages_desc, fifo_putpages }, 		/* putpages */
 	{ NULL, NULL }
 };
 const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc =
 	{ &fifo_nfsv2nodeop_p, fifo_nfsv2nodeop_entries };
 static int nfs_linkrpc(struct vnode *, struct vnode *, const char *,
     size_t, kauth_cred_t, struct lwp *);
 static void nfs_writerpc_extfree(struct mbuf *, void *, size_t, void *);
 /*
  * Global variables
  */
 extern u_int32_t nfs_true, nfs_false;
 extern u_int32_t nfs_xdrneg1;
 extern const nfstype nfsv3_type[9];
 int nfs_numasync = 0;
 #define	DIRHDSIZ	_DIRENT_NAMEOFF(dp)
 #define UIO_ADVANCE(uio, siz) \
     (void)((uio)->uio_resid -= (siz), \
     (uio)->uio_iov->iov_base = (char *)(uio)->uio_iov->iov_base + (siz), \
     (uio)->uio_iov->iov_len -= (siz))
 static void nfs_cache_enter(struct vnode *, struct vnode *,
     struct componentname *);
 static void
 nfs_cache_enter(struct vnode *dvp, struct vnode *vp,
     struct componentname *cnp)
 	struct nfsnode *dnp = VTONFS(dvp);
 	if (vp != NULL) {
 		struct nfsnode *np = VTONFS(vp);
 		np->n_ctime = np->n_vattr->va_ctime.tv_sec;
 	if (!timespecisset(&dnp->n_nctime))
 		dnp->n_nctime = dnp->n_vattr->va_mtime;
 	cache_enter(dvp, vp, cnp);
 /*
  * nfs null call from vfs.
  */
 int
 nfs_null(vp, cred, l)
 	struct vnode *vp;
 	kauth_cred_t cred;
 	struct lwp *l;
 	char *bpos, *dpos;
 	int error = 0;
 	struct mbuf *mreq, *mrep, *md, *mb;
 	struct nfsnode *np = VTONFS(vp);
 	nfsm_reqhead(np, NFSPROC_NULL, 0);
 	nfsm_request(np, NFSPROC_NULL, l, cred);
 	nfsm_reqdone;
 	return (error);
 /*
  * nfs access vnode op.
  * For nfs version 2, just return ok. File accesses may fail later.
  * For nfs version 3, use the access rpc to check accessibility. If file modes
  * are changed on the server, accesses might still fail later.
  */
 int
 nfs_access(v)
 	void *v;
 	struct vop_access_args /* {
 		struct vnode *a_vp;
 		int  a_mode;
 		kauth_cred_t a_cred;
 	} */ *ap = v;
 	struct vnode *vp = ap->a_vp;
 #ifndef NFS_V2_ONLY
 	u_int32_t *tl;
 	char *cp;
 	int32_t t1, t2;
 	char *bpos, *dpos, *cp2;
 	int error = 0, attrflag;
 	struct mbuf *mreq, *mrep, *md, *mb;
 	u_int32_t mode, rmode;
 	const int v3 = NFS_ISV3(vp);
 #endif
 	int cachevalid;
 	struct nfsnode *np = VTONFS(vp);
 	struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 	cachevalid = (np->n_accstamp != -1 &&
 	    (time_uptime - np->n_accstamp) < nfs_attrtimeo(nmp, np) &&
 	    np->n_accuid == kauth_cred_geteuid(ap->a_cred));
 	/*
 	 * Check access cache first. If this request has been made for this
 	 * uid shortly before, use the cached result.
 	 */
 	if (cachevalid) {
 		if (!np->n_accerror) {
 			if  ((np->n_accmode & ap->a_mode) == ap->a_mode)
 				return np->n_accerror;
 		} else if ((np->n_accmode & ap->a_mode) == np->n_accmode)
 			return np->n_accerror;
 #ifndef NFS_V2_ONLY
 	/*
 	 * For nfs v3, do an access rpc, otherwise you are stuck emulating
 	 * ufs_access() locally using the vattr. This may not be correct,
 	 * since the server may apply other access criteria such as
 	 * client uid-->server uid mapping that we do not know about, but
 	 * this is better than just returning anything that is lying about
 	 * in the cache.
 	 */
 	if (v3) {
 		nfsstats.rpccnt[NFSPROC_ACCESS]++;
 		nfsm_reqhead(np, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED);
 		nfsm_fhtom(np, v3);
 		nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
 		if (ap->a_mode & VREAD)
 			mode = NFSV3ACCESS_READ;
 		else
 			mode = 0;
 		if (vp->v_type != VDIR) {
 			if (ap->a_mode & VWRITE)
 				mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND);
 			if (ap->a_mode & VEXEC)
 				mode |= NFSV3ACCESS_EXECUTE;
 		} else {
 			if (ap->a_mode & VWRITE)
 				mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND |
 					 NFSV3ACCESS_DELETE);
 			if (ap->a_mode & VEXEC)
 				mode |= NFSV3ACCESS_LOOKUP;
 		*tl = txdr_unsigned(mode);
 		nfsm_request(np, NFSPROC_ACCESS, curlwp, ap->a_cred);
 		nfsm_postop_attr(vp, attrflag, 0);
 		if (!error) {
 			nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
 			rmode = fxdr_unsigned(u_int32_t, *tl);
 			/*
 			 * The NFS V3 spec does not clarify whether or not
 			 * the returned access bits can be a superset of
 			 * the ones requested, so...
 			 */
 			if ((rmode & mode) != mode)
 				error = EACCES;
 		nfsm_reqdone;
 	} else
 #endif
 		return (nfsspec_access(ap));
 #ifndef NFS_V2_ONLY
 	/*
 	 * Disallow write attempts on filesystems mounted read-only;
 	 * unless the file is a socket, fifo, or a block or character
 	 * device resident on the filesystem.
 	 */
 	if (!error && (ap->a_mode & VWRITE) &&
 	    (vp->v_mount->mnt_flag & MNT_RDONLY)) {
 		switch (vp->v_type) {
 		case VREG:
 		case VDIR:
 		case VLNK:
 			error = EROFS;
 		default:
 			break;
 	if (!error || error == EACCES) {
 		/*
 		 * If we got the same result as for a previous,
 		 * different request, OR it in. Don't update
 		 * the timestamp in that case.
 		 */
 		if (cachevalid && np->n_accstamp != -1 &&
 		    error == np->n_accerror) {
 			if (!error)
 				np->n_accmode |= ap->a_mode;
 			else if ((np->n_accmode & ap->a_mode) == ap->a_mode)
 				np->n_accmode = ap->a_mode;
 		} else {
 			np->n_accstamp = time_uptime;
 			np->n_accuid = kauth_cred_geteuid(ap->a_cred);
 			np->n_accmode = ap->a_mode;
 			np->n_accerror = error;
 	return (error);
 #endif
 /*
  * nfs open vnode op
  * Check to see if the type is ok
  * and that deletion is not in progress.
  * For paged in text files, you will need to flush the page cache
  * if consistency is lost.
  */
 /* ARGSUSED */
 int
 nfs_open(v)
 	void *v;
 	struct vop_open_args /* {
 		struct vnode *a_vp;
 		int  a_mode;
 		kauth_cred_t a_cred;
 	} */ *ap = v;
 	struct vnode *vp = ap->a_vp;
 	struct nfsnode *np = VTONFS(vp);
 	int error;
 	if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) {
 		return (EACCES);
 	if (ap->a_mode & FREAD) {
 		if (np->n_rcred != NULL)
 			kauth_cred_free(np->n_rcred);
 		np->n_rcred = ap->a_cred;
 		kauth_cred_hold(np->n_rcred);
 	if (ap->a_mode & FWRITE) {
 		if (np->n_wcred != NULL)
 			kauth_cred_free(np->n_wcred);
 		np->n_wcred = ap->a_cred;
 		kauth_cred_hold(np->n_wcred);
 	error = nfs_flushstalebuf(vp, ap->a_cred, curlwp, 0);
 	if (error)
 		return error;
 	NFS_INVALIDATE_ATTRCACHE(np); /* For Open/Close consistency */
 	return (0);
 /*
  * nfs close vnode op
  * What an NFS client should do upon close after writing is a debatable issue.
  * Most NFS clients push delayed writes to the server upon close, basically for
  * two reasons:
  * 1 - So that any write errors may be reported back to the client process
  *     doing the close system call. By far the two most likely errors are
  *     NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure.
  * 2 - To put a worst case upper bound on cache inconsistency between
  *     multiple clients for the file.
  * There is also a consistency problem for Version 2 of the protocol w.r.t.
  * not being able to tell if other clients are writing a file concurrently,
  * since there is no way of knowing if the changed modify time in the reply
  * is only due to the write for this client.
  * (NFS Version 3 provides weak cache consistency data in the reply that
  *  should be sufficient to detect and handle this case.)
  * The current code does the following:
  * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers
  * for NFS Version 3 - flush dirty buffers to the server but don't invalidate
  *                     or commit them (this satisfies 1 and 2 except for the
  *                     case where the server crashes after this close but
  *                     before the commit RPC, which is felt to be "good
  *                     enough". Changing the last argument to nfs_flush() to
  *                     a 1 would force a commit operation, if it is felt a
  *                     commit is necessary now.
  */
 /* ARGSUSED */
 int
 nfs_close(v)
 	void *v;
 	struct vop_close_args /* {
 		struct vnodeop_desc *a_desc;
 		struct vnode *a_vp;
 		int  a_fflag;
 		kauth_cred_t a_cred;
 	} */ *ap = v;
 	struct vnode *vp = ap->a_vp;
 	struct nfsnode *np = VTONFS(vp);
 	int error = 0;
 	UVMHIST_FUNC("nfs_close"); UVMHIST_CALLED(ubchist);
 	if (vp->v_type == VREG) {
 	    if (np->n_flag & NMODIFIED) {
 #ifndef NFS_V2_ONLY
 		if (NFS_ISV3(vp)) {
 		    error = nfs_flush(vp, ap->a_cred, MNT_WAIT, curlwp, 0);
 		    np->n_flag &= ~NMODIFIED;
 		} else
 #endif
 		    error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, curlwp, 1);
 		NFS_INVALIDATE_ATTRCACHE(np);
 	    if (np->n_flag & NWRITEERR) {
 		np->n_flag &= ~NWRITEERR;
 		error = np->n_error;
 	UVMHIST_LOG(ubchist, "returning %d", error,0,0,0);
 	return (error);
 /*
  * nfs getattr call from vfs.
  */
 int
 nfs_getattr(v)
 	void *v;
 	struct vop_getattr_args /* {
 		struct vnode *a_vp;
 		struct vattr *a_vap;
 		kauth_cred_t a_cred;
 	} */ *ap = v;
 	struct vnode *vp = ap->a_vp;
 	struct nfsnode *np = VTONFS(vp);
 	char *cp;
 	u_int32_t *tl;
 	int32_t t1, t2;
 	char *bpos, *dpos;
 	int error = 0;
 	struct mbuf *mreq, *mrep, *md, *mb;
 	const int v3 = NFS_ISV3(vp);
 	/*
 	 * Update local times for special files.
 	 */
 	if (np->n_flag & (NACC | NUPD))
 		np->n_flag |= NCHG;
 	/*
 	 * if we have delayed truncation, do it now.
 	 */
 	nfs_delayedtruncate(vp);
 	/*
 	 * First look in the cache.
 	 */
 	if (nfs_getattrcache(vp, ap->a_vap) == 0)
 		return (0);
 	nfsstats.rpccnt[NFSPROC_GETATTR]++;
 	nfsm_reqhead(np, NFSPROC_GETATTR, NFSX_FH(v3));
 	nfsm_fhtom(np, v3);
 	nfsm_request(np, NFSPROC_GETATTR, curlwp, ap->a_cred);
 	if (!error) {
 		nfsm_loadattr(vp, ap->a_vap, 0);
 		if (vp->v_type == VDIR &&
 		    ap->a_vap->va_blocksize < NFS_DIRFRAGSIZ)
 			ap->a_vap->va_blocksize = NFS_DIRFRAGSIZ;
 	nfsm_reqdone;
 	return (error);
 /*
  * nfs setattr call.
  */
 int
 nfs_setattr(v)
 	void *v;
 	struct vop_setattr_args /* {
 		struct vnodeop_desc *a_desc;
 		struct vnode *a_vp;
 		struct vattr *a_vap;
 		kauth_cred_t a_cred;
 	} */ *ap = v;
 	struct vnode *vp = ap->a_vp;
 	struct nfsnode *np = VTONFS(vp);
 	struct vattr *vap = ap->a_vap;
 	int error = 0;
 	u_quad_t tsize = 0;
 	/*
 	 * Setting of flags is not supported.
 	 */
 	if (vap->va_flags != VNOVAL)
 		return (EOPNOTSUPP);
 	/*
 	 * Disallow write attempts if the filesystem is mounted read-only.
 	 */
   	if ((vap->va_uid != (uid_t)VNOVAL ||
 	    vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
 	    vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) &&
 	    (vp->v_mount->mnt_flag & MNT_RDONLY))
 		return (EROFS);
 	if (vap->va_size != VNOVAL) {
 		if (vap->va_size > VFSTONFS(vp->v_mount)->nm_maxfilesize) {
 			return EFBIG;
  		switch (vp->v_type) {
  		case VDIR:
  			return (EISDIR);
  		case VCHR:
  		case VBLK:
  		case VSOCK:
  		case VFIFO:
 			if (vap->va_mtime.tv_sec == VNOVAL &&
 			    vap->va_atime.tv_sec == VNOVAL &&
 			    vap->va_mode == (mode_t)VNOVAL &&
 			    vap->va_uid == (uid_t)VNOVAL &&
 			    vap->va_gid == (gid_t)VNOVAL)
 				return (0);
  			vap->va_size = VNOVAL;
  			break;
  		default:
 			/*
 			 * Disallow write attempts if the filesystem is
 			 * mounted read-only.
 			 */
 			if (vp->v_mount->mnt_flag & MNT_RDONLY)
 				return (EROFS);
 			genfs_node_wrlock(vp);
  			uvm_vnp_setsize(vp, vap->va_size);
  			tsize = np->n_size;
 			np->n_size = vap->va_size;
  			if (vap->va_size == 0)
  				error = nfs_vinvalbuf(vp, 0,
  				     ap->a_cred, curlwp, 1);
 			else
 				error = nfs_vinvalbuf(vp, V_SAVE,
 				     ap->a_cred, curlwp, 1);
 			if (error) {
 				uvm_vnp_setsize(vp, tsize);
 				genfs_node_unlock(vp);
 				return (error);
  			np->n_vattr->va_size = vap->va_size;
   	} else {
 		/*
 		 * flush files before setattr because a later write of
 		 * cached data might change timestamps or reset sugid bits
 		 */
 		if ((vap->va_mtime.tv_sec != VNOVAL ||
 		     vap->va_atime.tv_sec != VNOVAL ||
 		     vap->va_mode != VNOVAL) &&
 		    vp->v_type == VREG &&
   		    (error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred,
 		 			   curlwp, 1)) == EINTR)
 			return (error);
 	error = nfs_setattrrpc(vp, vap, ap->a_cred, curlwp);
 	if (vap->va_size != VNOVAL) {
 		if (error) {
 			np->n_size = np->n_vattr->va_size = tsize;
 			uvm_vnp_setsize(vp, np->n_size);
 		genfs_node_unlock(vp);
 	VN_KNOTE(vp, NOTE_ATTRIB);
 	return (error);
 /*
  * Do an nfs setattr rpc.
  */
 int
 nfs_setattrrpc(vp, vap, cred, l)
 	struct vnode *vp;
 	struct vattr *vap;
 	kauth_cred_t cred;
 	struct lwp *l;
 	struct nfsv2_sattr *sp;
 	char *cp;
 	int32_t t1, t2;
 	char *bpos, *dpos;
 	u_int32_t *tl;
 	int error = 0;
 	struct mbuf *mreq, *mrep, *md, *mb;
 	const int v3 = NFS_ISV3(vp);
 	struct nfsnode *np = VTONFS(vp);
 #ifndef NFS_V2_ONLY
 	int wccflag = NFSV3_WCCRATTR;
 	char *cp2;
 #endif
 	nfsstats.rpccnt[NFSPROC_SETATTR]++;
 	nfsm_reqhead(np, NFSPROC_SETATTR, NFSX_FH(v3) + NFSX_SATTR(v3));
 	nfsm_fhtom(np, v3);
 #ifndef NFS_V2_ONLY
 	if (v3) {
 		nfsm_v3attrbuild(vap, true);
 		nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
 		*tl = nfs_false;
 	} else {
 #endif
 		nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
 		if (vap->va_mode == (mode_t)VNOVAL)
 			sp->sa_mode = nfs_xdrneg1;
 		else
 			sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode);
 		if (vap->va_uid == (uid_t)VNOVAL)
 			sp->sa_uid = nfs_xdrneg1;
 		else
 			sp->sa_uid = txdr_unsigned(vap->va_uid);
 		if (vap->va_gid == (gid_t)VNOVAL)
 			sp->sa_gid = nfs_xdrneg1;
 		else
 			sp->sa_gid = txdr_unsigned(vap->va_gid);
 		sp->sa_size = txdr_unsigned(vap->va_size);
 		txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
 		txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
 #ifndef NFS_V2_ONLY
 #endif
 	nfsm_request(np, NFSPROC_SETATTR, l, cred);
 #ifndef NFS_V2_ONLY
 	if (v3) {
 		nfsm_wcc_data(vp, wccflag, NAC_NOTRUNC, false);
 	} else
 #endif
 		nfsm_loadattr(vp, (struct vattr *)0, NAC_NOTRUNC);
 	nfsm_reqdone;
 	return (error);
 /*
  * nfs lookup call, one step at a time...
  * First look in cache
  * If not found, unlock the directory nfsnode and do the rpc
  * This code is full of lock/unlock statements and checks, because
  * we continue after cache_lookup has finished (we need to check
  * with the attr cache and do an rpc if it has timed out). This means
  * that the locking effects of cache_lookup have to be taken into
  * account.
  */
 int
 nfs_lookup(v)
 	void *v;
 	struct vop_lookup_args /* {
 		struct vnodeop_desc *a_desc;
 		struct vnode *a_dvp;
 		struct vnode **a_vpp;
 		struct componentname *a_cnp;
 	} */ *ap = v;
 	struct componentname *cnp = ap->a_cnp;
 	struct vnode *dvp = ap->a_dvp;
 	struct vnode **vpp = ap->a_vpp;
 	int flags;
 	struct vnode *newvp;
 	u_int32_t *tl;
 	char *cp;
 	int32_t t1, t2;
 	char *bpos, *dpos, *cp2;
 	struct mbuf *mreq, *mrep, *md, *mb;
 	long len;
 	nfsfh_t *fhp;
 	struct nfsnode *np;
 	int error = 0, attrflag, fhsize;
 	const int v3 = NFS_ISV3(dvp);
 	flags = cnp->cn_flags;
 	*vpp = NULLVP;
 	newvp = NULLVP;
 	if ((flags & ISLASTCN) && (dvp->v_mount->mnt_flag & MNT_RDONLY) &&
 	    (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
 		return (EROFS);
 	if (dvp->v_type != VDIR)
 		return (ENOTDIR);
 	/*
 	 * RFC1813(nfsv3) 3.2 says clients should handle "." by themselves.
 	 */
 	if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
 		error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred);
 		if (error)
 			return error;
 		if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN))
 			return EISDIR;
 		VREF(dvp);
 		*vpp = dvp;
 		if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
 			cnp->cn_flags |= SAVENAME;
 		return 0;
 	np = VTONFS(dvp);
 	/*
 	 * Before tediously performing a linear scan of the directory,
 	 * check the name cache to see if the directory/name pair
 	 * we are looking for is known already.
 	 * If the directory/name pair is found in the name cache,
 	 * we have to ensure the directory has not changed from
 	 * the time the cache entry has been created. If it has,
 	 * the cache entry has to be ignored.
 	 */
 	error = cache_lookup_raw(dvp, vpp, cnp);
 	KASSERT(dvp != *vpp);
 	if (error >= 0) {
 		struct vattr vattr;
 		int err2;
 		if (error && error != ENOENT) {
 			*vpp = NULLVP;
 			return error;
 		err2 = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred);
 		if (err2 != 0) {
 			if (error == 0)
 				vrele(*vpp);
 			*vpp = NULLVP;
 			return err2;
 		if (VOP_GETATTR(dvp, &vattr, cnp->cn_cred)
 		    || timespeccmp(&vattr.va_mtime,
 		    &VTONFS(dvp)->n_nctime, !=)) {
 			if (error == 0) {
 				vrele(*vpp);
 				*vpp = NULLVP;
 			cache_purge1(dvp, NULL, PURGE_CHILDREN);
 			timespecclear(&np->n_nctime);
 			goto dorpc;
 		if (error == ENOENT) {
 			goto noentry;
 		newvp = *vpp;
 		if (!VOP_GETATTR(newvp, &vattr, cnp->cn_cred)
 		    && vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime) {
 			nfsstats.lookupcache_hits++;
 			if ((flags & ISDOTDOT) != 0) {
 				VOP_UNLOCK(dvp, 0);
 			error = vn_lock(newvp, LK_EXCLUSIVE);
 			if ((flags & ISDOTDOT) != 0) {
 				vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
 			if (error) {
 				/* newvp has been revoked. */
 				vrele(newvp);
 				*vpp = NULL;
 				return error;
 			if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
 				cnp->cn_flags |= SAVENAME;
 			KASSERT(newvp->v_type != VNON);
 			return (0);
 		cache_purge1(newvp, NULL, PURGE_PARENTS);
 		vrele(newvp);
 		*vpp = NULLVP;
 dorpc:
 #if 0
 	/*
 	 * because nfsv3 has the same CREATE semantics as ours,
 	 * we don't have to perform LOOKUPs beforehand.
 	 * XXX ideally we can do the same for nfsv2 in the case of !O_EXCL.
 	 * XXX although we have no way to know if O_EXCL is requested or not.
 	 */
 	if (v3 && cnp->cn_nameiop == CREATE &&
 	    (flags & (ISLASTCN|ISDOTDOT)) == ISLASTCN &&
 	    (dvp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
 		cnp->cn_flags |= SAVENAME;
 		return (EJUSTRETURN);
 #endif /* 0 */
 	error = 0;
 	newvp = NULLVP;
 	nfsstats.lookupcache_misses++;
 	nfsstats.rpccnt[NFSPROC_LOOKUP]++;
 	len = cnp->cn_namelen;
 	nfsm_reqhead(np, NFSPROC_LOOKUP,
 		NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len));
 	nfsm_fhtom(np, v3);
 	nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN);
 	nfsm_request(np, NFSPROC_LOOKUP, curlwp, cnp->cn_cred);
 	if (error) {
 		nfsm_postop_attr(dvp, attrflag, 0);
 		m_freem(mrep);
 		goto nfsmout;
 	nfsm_getfh(fhp, fhsize, v3);
 	/*
 	 * Handle RENAME case...
 	 */
 	if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) {
 		if (NFS_CMPFH(np, fhp, fhsize)) {
 			m_freem(mrep);
 			return (EISDIR);
 		error = nfs_nget(dvp->v_mount, fhp, fhsize, &np);
 		if (error) {
 			m_freem(mrep);
 			return error;
 		newvp = NFSTOV(np);
 #ifndef NFS_V2_ONLY
 		if (v3) {
 			nfsm_postop_attr(newvp, attrflag, 0);
 			nfsm_postop_attr(dvp, attrflag, 0);
 		} else
 #endif
 			nfsm_loadattr(newvp, (struct vattr *)0, 0);
 		*vpp = newvp;
 		m_freem(mrep);
 		cnp->cn_flags |= SAVENAME;
 		goto validate;
 	/*
 	 * The postop attr handling is duplicated for each if case,
 	 * because it should be done while dvp is locked (unlocking
 	 * dvp is different for each case).
 	 */
 	if (NFS_CMPFH(np, fhp, fhsize)) {
 		/*
 		 * "." lookup
 		 */
 		VREF(dvp);
 		newvp = dvp;
 #ifndef NFS_V2_ONLY
 		if (v3) {
 			nfsm_postop_attr(newvp, attrflag, 0);
 			nfsm_postop_attr(dvp, attrflag, 0);
 		} else
 #endif
 			nfsm_loadattr(newvp, (struct vattr *)0, 0);
 	} else if (flags & ISDOTDOT) {
 		/*
 		 * ".." lookup
 		 */
 		VOP_UNLOCK(dvp, 0);
 		error = nfs_nget(dvp->v_mount, fhp, fhsize, &np);
 		vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
 		if (error) {
 			m_freem(mrep);
 			return error;
 		newvp = NFSTOV(np);
 #ifndef NFS_V2_ONLY
 		if (v3) {
 			nfsm_postop_attr(newvp, attrflag, 0);
 			nfsm_postop_attr(dvp, attrflag, 0);
 		} else
 #endif
 			nfsm_loadattr(newvp, (struct vattr *)0, 0);
 	} else {
 		/*
 		 * Other lookups.
 		 */
 		error = nfs_nget(dvp->v_mount, fhp, fhsize, &np);
 		if (error) {
 			m_freem(mrep);
 			return error;
 		newvp = NFSTOV(np);
 #ifndef NFS_V2_ONLY
 		if (v3) {
 			nfsm_postop_attr(newvp, attrflag, 0);
 			nfsm_postop_attr(dvp, attrflag, 0);
 		} else
 #endif
 			nfsm_loadattr(newvp, (struct vattr *)0, 0);
 	if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
 		cnp->cn_flags |= SAVENAME;
 	if ((cnp->cn_flags & MAKEENTRY) &&
 	    (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN))) {
 		nfs_cache_enter(dvp, newvp, cnp);
 	*vpp = newvp;
 	nfsm_reqdone;
 	if (error) {
 		/*
 		 * We get here only because of errors returned by
 		 * the RPC. Otherwise we'll have returned above
 		 * (the nfsm_* macros will jump to nfsm_reqdone
 		 * on error).
 		 */
 		if (error == ENOENT && (cnp->cn_flags & MAKEENTRY) &&
 		    cnp->cn_nameiop != CREATE) {
 			nfs_cache_enter(dvp, NULL, cnp);
 		if (newvp != NULLVP) {
 			if (newvp == dvp) {
 				vrele(newvp);
 			} else {
 				vput(newvp);
 noentry:
 		if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
 		    (flags & ISLASTCN) && error == ENOENT) {
 			if (dvp->v_mount->mnt_flag & MNT_RDONLY) {
 				error = EROFS;
 			} else {
 				error = EJUSTRETURN;
 				cnp->cn_flags |= SAVENAME;
 		*vpp = NULL;
 		return error;
 validate:
 	/*
 	 * make sure we have valid type and size.
 	 */
 	newvp = *vpp;
 	if (newvp->v_type == VNON) {
 		struct vattr vattr; /* dummy */
 		KASSERT(VTONFS(newvp)->n_attrstamp == 0);
 		error = VOP_GETATTR(newvp, &vattr, cnp->cn_cred);
 		if (error) {
 			vput(newvp);
 			*vpp = NULL;
 	return error;
 /*
  * nfs read call.
  * Just call nfs_bioread() to do the work.
  */
 int
 nfs_read(v)
 	void *v;
 	struct vop_read_args /* {
 		struct vnode *a_vp;
 		struct uio *a_uio;
 		int  a_ioflag;
 		kauth_cred_t a_cred;
 	} */ *ap = v;
 	struct vnode *vp = ap->a_vp;
 	if (vp->v_type != VREG)
 		return EISDIR;
 	return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred, 0));
 /*
  * nfs readlink call
  */
 int
 nfs_readlink(v)
 	void *v;
 	struct vop_readlink_args /* {
 		struct vnode *a_vp;
 		struct uio *a_uio;
 		kauth_cred_t a_cred;
 	} */ *ap = v;
 	struct vnode *vp = ap->a_vp;
 	struct nfsnode *np = VTONFS(vp);
 	if (vp->v_type != VLNK)
 		return (EPERM);
 	if (np->n_rcred != NULL) {
 		kauth_cred_free(np->n_rcred);
 	np->n_rcred = ap->a_cred;
 	kauth_cred_hold(np->n_rcred);
 	return (nfs_bioread(vp, ap->a_uio, 0, ap->a_cred, 0));
 /*
  * Do a readlink rpc.
  * Called by nfs_doio() from below the buffer cache.
  */
 int
 nfs_readlinkrpc(vp, uiop, cred)
 	struct vnode *vp;
 	struct uio *uiop;
 	kauth_cred_t cred;
 	u_int32_t *tl;
 	char *cp;
 	int32_t t1, t2;
 	char *bpos, *dpos, *cp2;
 	int error = 0;
 	uint32_t len;
 	struct mbuf *mreq, *mrep, *md, *mb;
 	const int v3 = NFS_ISV3(vp);
 	struct nfsnode *np = VTONFS(vp);
 #ifndef NFS_V2_ONLY
 	int attrflag;
 #endif
 	nfsstats.rpccnt[NFSPROC_READLINK]++;
 	nfsm_reqhead(np, NFSPROC_READLINK, NFSX_FH(v3));
 	nfsm_fhtom(np, v3);
 	nfsm_request(np, NFSPROC_READLINK, curlwp, cred);
 #ifndef NFS_V2_ONLY
 	if (v3)
 		nfsm_postop_attr(vp, attrflag, 0);
 #endif
 	if (!error) {
 #ifndef NFS_V2_ONLY
 		if (v3) {
 			nfsm_dissect(tl, uint32_t *, NFSX_UNSIGNED);
 			len = fxdr_unsigned(uint32_t, *tl);
 			if (len > MAXPATHLEN) {
 				/*
 				 * this pathname is too long for us.
 				 */
 				m_freem(mrep);
 				/* Solaris returns EINVAL. should we follow? */
 				error = ENAMETOOLONG;
 				goto nfsmout;
 		} else
 #endif
 			nfsm_strsiz(len, NFS_MAXPATHLEN);
 		nfsm_mtouio(uiop, len);
 	nfsm_reqdone;
 	return (error);
 /*
  * nfs read rpc call
  * Ditto above
  */
 int
 nfs_readrpc(vp, uiop)
 	struct vnode *vp;
 	struct uio *uiop;
 	u_int32_t *tl;
 	char *cp;
 	int32_t t1, t2;
 	char *bpos, *dpos, *cp2;
 	struct mbuf *mreq, *mrep, *md, *mb;
 	struct nfsmount *nmp;
 	int error = 0, len, retlen, tsiz, eof, byte_count;
 	const int v3 = NFS_ISV3(vp);
 	struct nfsnode *np = VTONFS(vp);
 #ifndef NFS_V2_ONLY
 	int attrflag;
 #endif
 #ifndef nolint
 	eof = 0;
 #endif
 	nmp = VFSTONFS(vp->v_mount);
 	tsiz = uiop->uio_resid;
 	if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize)
 		return (EFBIG);
 	iostat_busy(nmp->nm_stats);
 	byte_count = 0; /* count bytes actually transferred */
 	while (tsiz > 0) {
 		nfsstats.rpccnt[NFSPROC_READ]++;
 		len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz;
 		nfsm_reqhead(np, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3);
 		nfsm_fhtom(np, v3);
 		nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED * 3);
 #ifndef NFS_V2_ONLY
 		if (v3) {
 			txdr_hyper(uiop->uio_offset, tl);
 			*(tl + 2) = txdr_unsigned(len);
 		} else
 #endif
 			*tl++ = txdr_unsigned(uiop->uio_offset);
 			*tl++ = txdr_unsigned(len);
 			*tl = 0;
 		nfsm_request(np, NFSPROC_READ, curlwp, np->n_rcred);
 #ifndef NFS_V2_ONLY
 		if (v3) {
 			nfsm_postop_attr(vp, attrflag, NAC_NOTRUNC);
 			if (error) {
 				m_freem(mrep);
 				goto nfsmout;
 			nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 			eof = fxdr_unsigned(int, *(tl + 1));
 		} else
 #endif
 			nfsm_loadattr(vp, (struct vattr *)0, NAC_NOTRUNC);
 		nfsm_strsiz(retlen, nmp->nm_rsize);
 		nfsm_mtouio(uiop, retlen);
 		m_freem(mrep);
 		tsiz -= retlen;
 		byte_count += retlen;
 #ifndef NFS_V2_ONLY
 		if (v3) {
 			if (eof || retlen == 0)
 				tsiz = 0;
 		} else
 #endif
 		if (retlen < len)
 			tsiz = 0;
 nfsmout:
 	iostat_unbusy(nmp->nm_stats, byte_count, 1);
 	return (error);
 struct nfs_writerpc_context {
 	kmutex_t nwc_lock;
 	kcondvar_t nwc_cv;
 	int nwc_mbufcount;
 };
 /*
  * free mbuf used to refer protected pages while write rpc call.
  * called at splvm.
  */
 static void
 nfs_writerpc_extfree(struct mbuf *m, void *tbuf, size_t size, void *arg)
 	struct nfs_writerpc_context *ctx = arg;
 	KASSERT(m != NULL);
 	KASSERT(ctx != NULL);
 	pool_cache_put(mb_cache, m);
 	mutex_enter(&ctx->nwc_lock);
 	if (--ctx->nwc_mbufcount == 0) {
 		cv_signal(&ctx->nwc_cv);
 	mutex_exit(&ctx->nwc_lock);
 /*
  * nfs write call
  */
 int
 nfs_writerpc(vp, uiop, iomode, pageprotected, stalewriteverfp)
 	struct vnode *vp;
 	struct uio *uiop;
 	int *iomode;
 	bool pageprotected;
 	bool *stalewriteverfp;
 	u_int32_t *tl;
 	char *cp;
 	int32_t t1, t2;
 	char *bpos, *dpos;
 	struct mbuf *mreq, *mrep, *md, *mb;
 	struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 	int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR;
 	const int v3 = NFS_ISV3(vp);
 	int committed = NFSV3WRITE_FILESYNC;
 	struct nfsnode *np = VTONFS(vp);
 	struct nfs_writerpc_context ctx;
 	int byte_count;
 	struct lwp *l = NULL;
 	size_t origresid;
 #ifndef NFS_V2_ONLY
 	char *cp2;
 	int rlen, commit;
 #endif
 	mutex_init(&ctx.nwc_lock, MUTEX_DRIVER, IPL_VM);
 	cv_init(&ctx.nwc_cv, "nfsmblk");
 	ctx.nwc_mbufcount = 1;
 	if (vp->v_mount->mnt_flag & MNT_RDONLY) {
 		panic("writerpc readonly vp %p", vp);
 #ifdef DIAGNOSTIC
 	if (uiop->uio_iovcnt != 1)
 		panic("nfs: writerpc iovcnt > 1");
 #endif
 	tsiz = uiop->uio_resid;
 	if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize)
 		return (EFBIG);
 	if (pageprotected) {
 		l = curlwp;
 		uvm_lwp_hold(l);
 retry:
 	origresid = uiop->uio_resid;
 	KASSERT(origresid == uiop->uio_iov->iov_len);
 	iostat_busy(nmp->nm_stats);
 	byte_count = 0; /* count of bytes actually written */
 	while (tsiz > 0) {
 		uint32_t datalen; /* data bytes need to be allocated in mbuf */
 		uint32_t backup;
 		bool stalewriteverf = false;
 		nfsstats.rpccnt[NFSPROC_WRITE]++;
 		len = min(tsiz, nmp->nm_wsize);
 		datalen = pageprotected ? 0 : nfsm_rndup(len);
 		nfsm_reqhead(np, NFSPROC_WRITE,
 			NFSX_FH(v3) + 5 * NFSX_UNSIGNED + datalen);
 		nfsm_fhtom(np, v3);
 #ifndef NFS_V2_ONLY
 		if (v3) {
 			nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
 			txdr_hyper(uiop->uio_offset, tl);
 			tl += 2;
 			*tl++ = txdr_unsigned(len);
 			*tl++ = txdr_unsigned(*iomode);
 			*tl = txdr_unsigned(len);
 		} else
 #endif
 			u_int32_t x;
 			nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
 			/* Set both "begin" and "current" to non-garbage. */
 			x = txdr_unsigned((u_int32_t)uiop->uio_offset);
 			*tl++ = x;      /* "begin offset" */
 			*tl++ = x;      /* "current offset" */
 			x = txdr_unsigned(len);
 			*tl++ = x;      /* total to this offset */
 			*tl = x;        /* size of this write */
 		if (pageprotected) {
 			/*
 			 * since we know pages can't be modified during i/o,
 			 * no need to copy them for us.
 			 */
 			struct mbuf *m;
 			struct iovec *iovp = uiop->uio_iov;
 			m = m_get(M_WAIT, MT_DATA);
 			MCLAIM(m, &nfs_mowner);
 			MEXTADD(m, iovp->iov_base, len, M_MBUF,
 			    nfs_writerpc_extfree, &ctx);
 			m->m_flags |= M_EXT_ROMAP;
 			m->m_len = len;
 			mb->m_next = m;
 			/*
 			 * no need to maintain mb and bpos here
 			 * because no one care them later.
 			 */
 #if 0
 			mb = m;
 			bpos = mtod(void *, mb) + mb->m_len;
 #endif
 			UIO_ADVANCE(uiop, len);
 			uiop->uio_offset += len;
 			mutex_enter(&ctx.nwc_lock);
 			ctx.nwc_mbufcount++;
 			mutex_exit(&ctx.nwc_lock);
 			nfs_zeropad(mb, 0, nfsm_padlen(len));
 		} else {
 			nfsm_uiotom(uiop, len);
 		nfsm_request(np, NFSPROC_WRITE, curlwp, np->n_wcred);
 #ifndef NFS_V2_ONLY
 		if (v3) {
 			wccflag = NFSV3_WCCCHK;
 			nfsm_wcc_data(vp, wccflag, NAC_NOTRUNC, !error);
 			if (!error) {
 				nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED
 					+ NFSX_V3WRITEVERF);
 				rlen = fxdr_unsigned(int, *tl++);
 				if (rlen == 0) {
 					error = NFSERR_IO;
 					m_freem(mrep);
 					break;
 				} else if (rlen < len) {
 					backup = len - rlen;
 					UIO_ADVANCE(uiop, -backup);
 					uiop->uio_offset -= backup;
 					len = rlen;
 				commit = fxdr_unsigned(int, *tl++);
 				/*
 				 * Return the lowest committment level
 				 * obtained by any of the RPCs.
 				 */
 				if (committed == NFSV3WRITE_FILESYNC)
 					committed = commit;
 				else if (committed == NFSV3WRITE_DATASYNC &&
 					commit == NFSV3WRITE_UNSTABLE)
 					committed = commit;
 				mutex_enter(&nmp->nm_lock);
 				if ((nmp->nm_iflag & NFSMNT_HASWRITEVERF) == 0){
 					memcpy(nmp->nm_writeverf, tl,
 					    NFSX_V3WRITEVERF);
 					nmp->nm_iflag |= NFSMNT_HASWRITEVERF;
 				} else if ((nmp->nm_iflag &
 				    NFSMNT_STALEWRITEVERF) ||
 				    memcmp(tl, nmp->nm_writeverf,
 				    NFSX_V3WRITEVERF)) {
 					memcpy(nmp->nm_writeverf, tl,
 					    NFSX_V3WRITEVERF);
 					/*
 					 * note NFSMNT_STALEWRITEVERF
 					 * if we're the first thread to
 					 * notice it.
 					 */
 					if ((nmp->nm_iflag &
 					    NFSMNT_STALEWRITEVERF) == 0) {
 						stalewriteverf = true;
 						nmp->nm_iflag |=
 						    NFSMNT_STALEWRITEVERF;
 				mutex_exit(&nmp->nm_lock);
 		} else
 #endif
 			nfsm_loadattr(vp, (struct vattr *)0, NAC_NOTRUNC);
 		if (wccflag)
 			VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr->va_mtime;
 		m_freem(mrep);
 		if (error)
 			break;
 		tsiz -= len;
 		byte_count += len;
 		if (stalewriteverf) {
 			*stalewriteverfp = true;
 			stalewriteverf = false;
 			if (committed == NFSV3WRITE_UNSTABLE &&
 			    len != origresid) {
 				/*
 				 * if our write requests weren't atomic but
 				 * unstable, datas in previous iterations
 				 * might have already been lost now.
 				 * then, we should resend them to nfsd.
 				 */
 				backup = origresid - tsiz;
 				UIO_ADVANCE(uiop, -backup);
 				uiop->uio_offset -= backup;
 				tsiz = origresid;
 				goto retry;
 nfsmout:
 	iostat_unbusy(nmp->nm_stats, byte_count, 0);
 	if (pageprotected) {
 		/*
 		 * wait until mbufs go away.
 		 * retransmitted mbufs can survive longer than rpc requests
 		 * themselves.
 		 */
 		mutex_enter(&ctx.nwc_lock);
 		ctx.nwc_mbufcount--;
 		while (ctx.nwc_mbufcount > 0) {
 			cv_wait(&ctx.nwc_cv, &ctx.nwc_lock);
 		mutex_exit(&ctx.nwc_lock);
 		uvm_lwp_rele(l);
 	mutex_destroy(&ctx.nwc_lock);
 	cv_destroy(&ctx.nwc_cv);
 	*iomode = committed;
 	if (error)
 		uiop->uio_resid = tsiz;
 	return (error);
 /*
  * nfs mknod rpc
  * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the
  * mode set to specify the file type and the size field for rdev.
  */
 int
 nfs_mknodrpc(dvp, vpp, cnp, vap)
 	struct vnode *dvp;
 	struct vnode **vpp;
 	struct componentname *cnp;
 	struct vattr *vap;
 	struct nfsv2_sattr *sp;
 	u_int32_t *tl;
 	char *cp;
 	int32_t t1, t2;
 	struct vnode *newvp = (struct vnode *)0;
 	struct nfsnode *dnp, *np;
 	char *cp2;
 	char *bpos, *dpos;
 	int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0;
 	struct mbuf *mreq, *mrep, *md, *mb;
 	u_int32_t rdev;
 	const int v3 = NFS_ISV3(dvp);
 	if (vap->va_type == VCHR || vap->va_type == VBLK)
 		rdev = txdr_unsigned(vap->va_rdev);
 	else if (vap->va_type == VFIFO || vap->va_type == VSOCK)
 		rdev = nfs_xdrneg1;
 	else {
 		VOP_ABORTOP(dvp, cnp);
 		vput(dvp);
 		return (EOPNOTSUPP);
 	nfsstats.rpccnt[NFSPROC_MKNOD]++;
 	dnp = VTONFS(dvp);
 	nfsm_reqhead(dnp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED +
 		+ nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3));
 	nfsm_fhtom(dnp, v3);
 	nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
 #ifndef NFS_V2_ONLY
 	if (v3) {
 		nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
 		*tl++ = vtonfsv3_type(vap->va_type);
 		nfsm_v3attrbuild(vap, false);
 		if (vap->va_type == VCHR || vap->va_type == VBLK) {
 			nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 			*tl++ = txdr_unsigned(major(vap->va_rdev));
 			*tl = txdr_unsigned(minor(vap->va_rdev));
 	} else
 #endif
 		nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
 		sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode);
 		sp->sa_uid = nfs_xdrneg1;
 		sp->sa_gid = nfs_xdrneg1;
 		sp->sa_size = rdev;
 		txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
 		txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
 	nfsm_request(dnp, NFSPROC_MKNOD, curlwp, cnp->cn_cred);
 	if (!error) {
 		nfsm_mtofh(dvp, newvp, v3, gotvp);
 		if (!gotvp) {
 			error = nfs_lookitup(dvp, cnp->cn_nameptr,
 			    cnp->cn_namelen, cnp->cn_cred, curlwp, &np);
 			if (!error)
 				newvp = NFSTOV(np);
 #ifndef NFS_V2_ONLY
 	if (v3)
 		nfsm_wcc_data(dvp, wccflag, 0, !error);
 #endif
 	nfsm_reqdone;
 	if (error) {
 		if (newvp)
 			vput(newvp);
 	} else {
 		if (cnp->cn_flags & MAKEENTRY)
 			nfs_cache_enter(dvp, newvp, cnp);
 		*vpp = newvp;
 	PNBUF_PUT(cnp->cn_pnbuf);
 	VTONFS(dvp)->n_flag |= NMODIFIED;
 	if (!wccflag)
 		NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
 	vput(dvp);
 	return (error);
 /*
  * nfs mknod vop
  * just call nfs_mknodrpc() to do the work.
  */
 /* ARGSUSED */
 int
 nfs_mknod(v)
 	void *v;
 	struct vop_mknod_args /* {
 		struct vnode *a_dvp;
 		struct vnode **a_vpp;
 		struct componentname *a_cnp;
 		struct vattr *a_vap;
 	} */ *ap = v;
 	struct vnode *dvp = ap->a_dvp;
 	struct componentname *cnp = ap->a_cnp;
 	int error;
 	error = nfs_mknodrpc(dvp, ap->a_vpp, cnp, ap->a_vap);
 	VN_KNOTE(dvp, NOTE_WRITE);
 	if (error == 0 || error == EEXIST)
 		cache_purge1(dvp, cnp, 0);
 	return (error);
 /*
  * nfs file create call
  */
 int
 nfs_create(v)
 	void *v;
 	struct vop_create_args /* {
 		struct vnode *a_dvp;
 		struct vnode **a_vpp;
 		struct componentname *a_cnp;
 		struct vattr *a_vap;
 	} */ *ap = v;
 	struct vnode *dvp = ap->a_dvp;
 	struct vattr *vap = ap->a_vap;
 	struct componentname *cnp = ap->a_cnp;
 	struct nfsv2_sattr *sp;
 	u_int32_t *tl;
 	char *cp;
 	int32_t t1, t2;
 	struct nfsnode *dnp, *np = (struct nfsnode *)0;
 	struct vnode *newvp = (struct vnode *)0;
 	char *bpos, *dpos, *cp2;
 	int error, wccflag = NFSV3_WCCRATTR, gotvp = 0;
 	struct mbuf *mreq, *mrep, *md, *mb;
 	const int v3 = NFS_ISV3(dvp);
 	u_int32_t excl_mode = NFSV3CREATE_UNCHECKED;
 	/*
 	 * Oops, not for me..
 	 */
 	if (vap->va_type == VSOCK)
 		return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap));
 	KASSERT(vap->va_type == VREG);
 #ifdef VA_EXCLUSIVE
 	if (vap->va_vaflags & VA_EXCLUSIVE) {
 		excl_mode = NFSV3CREATE_EXCLUSIVE;
 #endif
 again:
 	error = 0;
 	nfsstats.rpccnt[NFSPROC_CREATE]++;
 	dnp = VTONFS(dvp);
 	nfsm_reqhead(dnp, NFSPROC_CREATE, NFSX_FH(v3) + 2 * NFSX_UNSIGNED +
 		nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3));
 	nfsm_fhtom(dnp, v3);
 	nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
 #ifndef NFS_V2_ONLY
 	if (v3) {
 		nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
 		if (excl_mode == NFSV3CREATE_EXCLUSIVE) {
 			*tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE);
 			nfsm_build(tl, u_int32_t *, NFSX_V3CREATEVERF);
 			*tl++ = arc4random();
 			*tl = arc4random();
 		} else {
 			*tl = txdr_unsigned(excl_mode);
 			nfsm_v3attrbuild(vap, false);
 	} else
 #endif
 		nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
 		sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode);
 		sp->sa_uid = nfs_xdrneg1;
 		sp->sa_gid = nfs_xdrneg1;
 		sp->sa_size = 0;
 		txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
 		txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
 	nfsm_request(dnp, NFSPROC_CREATE, curlwp, cnp->cn_cred);
 	if (!error) {
 		nfsm_mtofh(dvp, newvp, v3, gotvp);
 		if (!gotvp) {
 			error = nfs_lookitup(dvp, cnp->cn_nameptr,
 			    cnp->cn_namelen, cnp->cn_cred, curlwp, &np);
 			if (!error)
 				newvp = NFSTOV(np);
 #ifndef NFS_V2_ONLY
 	if (v3)
 		nfsm_wcc_data(dvp, wccflag, 0, !error);
 #endif
 	nfsm_reqdone;
 	if (error) {
 		/*
 		 * nfs_request maps NFSERR_NOTSUPP to ENOTSUP.
 		 */
 		if (v3 && error == ENOTSUP) {
 			if (excl_mode == NFSV3CREATE_EXCLUSIVE) {
 				excl_mode = NFSV3CREATE_GUARDED;
 				goto again;
 			} else if (excl_mode == NFSV3CREATE_GUARDED) {
 				excl_mode = NFSV3CREATE_UNCHECKED;
 				goto again;
 	} else if (v3 && (excl_mode == NFSV3CREATE_EXCLUSIVE)) {
 		struct timespec ts;
 		getnanotime(&ts);
 		/*
 		 * make sure that we'll update timestamps as
 		 * most server implementations use them to store
 		 * the create verifier.
 		 * XXX it's better to use TOSERVER always.
 		 */
 		if (vap->va_atime.tv_sec == VNOVAL)
 			vap->va_atime = ts;
 		if (vap->va_mtime.tv_sec == VNOVAL)
 			vap->va_mtime = ts;
 		error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, curlwp);
 	if (error == 0) {
 		if (cnp->cn_flags & MAKEENTRY)
 			nfs_cache_enter(dvp, newvp, cnp);
 		else
 			cache_purge1(dvp, cnp, 0);
 		*ap->a_vpp = newvp;
 	} else {
 		if (newvp)
 			vput(newvp);
 		if (error == EEXIST)
 			cache_purge1(dvp, cnp, 0);
 	PNBUF_PUT(cnp->cn_pnbuf);
 	VTONFS(dvp)->n_flag |= NMODIFIED;
 	if (!wccflag)
 		NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
 	VN_KNOTE(ap->a_dvp, NOTE_WRITE);
 	vput(dvp);
 	return (error);
 /*
  * nfs file remove call
  * 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 a rename is not already in the works
  *	     call nfs_sillyrename() to set it up
  *     else
  *	  do the remove rpc
  */
 int
 nfs_remove(v)
 	void *v;
 	struct vop_remove_args /* {
 		struct vnodeop_desc *a_desc;
 		struct vnode * a_dvp;
 		struct vnode * a_vp;
 		struct componentname * a_cnp;
 	} */ *ap = v;
 	struct vnode *vp = ap->a_vp;
 	struct vnode *dvp = ap->a_dvp;
 	struct componentname *cnp = ap->a_cnp;
 	struct nfsnode *np = VTONFS(vp);
 	int error = 0;
 	struct vattr vattr;
 #ifndef DIAGNOSTIC
 	if ((cnp->cn_flags & HASBUF) == 0)
 		panic("nfs_remove: no name");
 	if (vp->v_usecount < 1)
 		panic("nfs_remove: bad v_usecount");
 #endif
 	if (vp->v_type == VDIR)
 		error = EPERM;
 	else if (vp->v_usecount == 1 || (np->n_sillyrename &&
 	    VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 &&
 	    vattr.va_nlink > 1)) {
 		/*
 		 * Purge the name cache so that the chance of a lookup for
 		 * the name succeeding while the remove is in progress is
 		 * minimized. Without node locking it can still happen, such
 		 * that an I/O op returns ESTALE, but since you get this if
 		 * another host removes the file..
 		 */
 		cache_purge(vp);
 		/*
 		 * throw away biocache buffers, mainly to avoid
 		 * unnecessary delayed writes later.
 		 */
 		error = nfs_vinvalbuf(vp, 0, cnp->cn_cred, curlwp, 1);
 		/* Do the rpc */
 		if (error != EINTR)
 			error = nfs_removerpc(dvp, cnp->cn_nameptr,
 				cnp->cn_namelen, cnp->cn_cred, curlwp);
 	} else if (!np->n_sillyrename)
 		error = nfs_sillyrename(dvp, vp, cnp, false);
 	PNBUF_PUT(cnp->cn_pnbuf);
 	if (!error && nfs_getattrcache(vp, &vattr) == 0 &&
 	    vattr.va_nlink == 1) {
 		np->n_flag |= NREMOVED;
 	NFS_INVALIDATE_ATTRCACHE(np);
 	VN_KNOTE(vp, NOTE_DELETE);
 	VN_KNOTE(dvp, NOTE_WRITE);
 	if (dvp == vp)
 		vrele(vp);
 	else
 		vput(vp);
 	vput(dvp);
 	return (error);
 /*
  * nfs file remove rpc called from nfs_inactive
  */
 int
 nfs_removeit(sp)
 	struct sillyrename *sp;
 	return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 		(struct lwp *)0));
 /*
  * Nfs remove rpc, called from nfs_remove() and nfs_removeit().
  */
 int
 nfs_removerpc(dvp, name, namelen, cred, l)
 	struct vnode *dvp;
 	const char *name;
 	int namelen;
 	kauth_cred_t cred;
 	struct lwp *l;
 	u_int32_t *tl;
 	char *cp;
 #ifndef NFS_V2_ONLY
 	int32_t t1;
 	char *cp2;
 #endif
 	int32_t t2;
 	char *bpos, *dpos;
 	int error = 0, wccflag = NFSV3_WCCRATTR;
 	struct mbuf *mreq, *mrep, *md, *mb;
 	const int v3 = NFS_ISV3(dvp);
 	int rexmit = 0;
 	struct nfsnode *dnp = VTONFS(dvp);
 	nfsstats.rpccnt[NFSPROC_REMOVE]++;
 	nfsm_reqhead(dnp, NFSPROC_REMOVE,
 		NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen));
 	nfsm_fhtom(dnp, v3);
 	nfsm_strtom(name, namelen, NFS_MAXNAMLEN);
 	nfsm_request1(dnp, NFSPROC_REMOVE, l, cred, &rexmit);
 #ifndef NFS_V2_ONLY
 	if (v3)
 		nfsm_wcc_data(dvp, wccflag, 0, !error);
 #endif
 	nfsm_reqdone;
 	VTONFS(dvp)->n_flag |= NMODIFIED;
 	if (!wccflag)
 		NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
 	/*
 	 * Kludge City: If the first reply to the remove rpc is lost..
 	 *   the reply to the retransmitted request will be ENOENT
 	 *   since the file was in fact removed
 	 *   Therefore, we cheat and return success.
 	 */
 	if (rexmit && error == ENOENT)
 		error = 0;
 	return (error);
 /*
  * nfs file rename call
  */
 int
 nfs_rename(v)
 	void *v;
 	struct vop_rename_args  /* {
 		struct vnode *a_fdvp;
 		struct vnode *a_fvp;
 		struct componentname *a_fcnp;
 		struct vnode *a_tdvp;
 		struct vnode *a_tvp;
 		struct componentname *a_tcnp;
 	} */ *ap = v;
 	struct vnode *fvp = ap->a_fvp;
 	struct vnode *tvp = ap->a_tvp;
 	struct vnode *fdvp = ap->a_fdvp;
 	struct vnode *tdvp = ap->a_tdvp;
 	struct componentname *tcnp = ap->a_tcnp;
 	struct componentname *fcnp = ap->a_fcnp;
 	int error;
 #ifndef DIAGNOSTIC
 	if ((tcnp->cn_flags & HASBUF) == 0 ||
 	    (fcnp->cn_flags & HASBUF) == 0)
 		panic("nfs_rename: no name");
 #endif
 	/* Check for cross-device rename */
 	if ((fvp->v_mount != tdvp->v_mount) ||
 	    (tvp && (fvp->v_mount != tvp->v_mount))) {
 		error = EXDEV;
 		goto out;
 	/*
 	 * If the tvp exists and is in use, sillyrename it before doing the
 	 * rename of the new file over it.
 	 * Have sillyrename use link instead of rename if possible,
 	 * 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 &&
 	    tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp, true)) {
 		VN_KNOTE(tvp, NOTE_DELETE);
 		vput(tvp);
 		tvp = NULL;
 	error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen,
 		tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
 		curlwp);
 	VN_KNOTE(fdvp, NOTE_WRITE);
 	VN_KNOTE(tdvp, NOTE_WRITE);
 	if (error == 0 || error == EEXIST) {
 		if (fvp->v_type == VDIR)
 			cache_purge(fvp);
 		else
 			cache_purge1(fdvp, fcnp, 0);
 		if (tvp != NULL && tvp->v_type == VDIR)
 			cache_purge(tvp);
 		else
 			cache_purge1(tdvp, tcnp, 0);
 out:
 	if (tdvp == tvp)
 		vrele(tdvp);
 	else
 		vput(tdvp);
 	if (tvp)
 		vput(tvp);
 	vrele(fdvp);
 	vrele(fvp);
 	return (error);
 /*
  * nfs file rename rpc called from nfs_remove() above
  */
 int
 nfs_renameit(sdvp, scnp, sp)
 	struct vnode *sdvp;
 	struct componentname *scnp;
 	struct sillyrename *sp;
 	return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen,
 		sdvp, sp->s_name, sp->s_namlen, scnp->cn_cred, curlwp));
 /*
  * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit().
  */
 int
 nfs_renamerpc(fdvp, fnameptr, fnamelen, tdvp, tnameptr, tnamelen, cred, l)
 	struct vnode *fdvp;
 	const char *fnameptr;
 	int fnamelen;
 	struct vnode *tdvp;
 	const char *tnameptr;
 	int tnamelen;
 	kauth_cred_t cred;
 	struct lwp *l;
 	u_int32_t *tl;
 	char *cp;
 #ifndef NFS_V2_ONLY
 	int32_t t1;
 	char *cp2;
 #endif
 	int32_t t2;
 	char *bpos, *dpos;
 	int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR;
 	struct mbuf *mreq, *mrep, *md, *mb;
 	const int v3 = NFS_ISV3(fdvp);
 	int rexmit = 0;
 	struct nfsnode *fdnp = VTONFS(fdvp);
 	nfsstats.rpccnt[NFSPROC_RENAME]++;
 	nfsm_reqhead(fdnp, NFSPROC_RENAME,
 		(NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) +
 		nfsm_rndup(tnamelen));
 	nfsm_fhtom(fdnp, v3);
 	nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN);
 	nfsm_fhtom(VTONFS(tdvp), v3);
 	nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN);
 	nfsm_request1(fdnp, NFSPROC_RENAME, l, cred, &rexmit);
 #ifndef NFS_V2_ONLY
 	if (v3) {
 		nfsm_wcc_data(fdvp, fwccflag, 0, !error);
 		nfsm_wcc_data(tdvp, twccflag, 0, !error);
 #endif
 	nfsm_reqdone;
 	VTONFS(fdvp)->n_flag |= NMODIFIED;
 	VTONFS(tdvp)->n_flag |= NMODIFIED;
 	if (!fwccflag)
 		NFS_INVALIDATE_ATTRCACHE(VTONFS(fdvp));
 	if (!twccflag)
 		NFS_INVALIDATE_ATTRCACHE(VTONFS(tdvp));
 	/*
 	 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry.
 	 */
 	if (rexmit && error == ENOENT)
 		error = 0;
 	return (error);
 /*
  * NFS link RPC, called from nfs_link.
  * Assumes dvp and vp locked, and leaves them that way.
  */
 static int
 nfs_linkrpc(struct vnode *dvp, struct vnode *vp, const char *name,
     size_t namelen, kauth_cred_t cred, struct lwp *l)
 	u_int32_t *tl;
 	char *cp;
 #ifndef NFS_V2_ONLY
 	int32_t t1;
 	char *cp2;
 #endif
 	int32_t t2;
 	char *bpos, *dpos;
 	int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0;
 	struct mbuf *mreq, *mrep, *md, *mb;
 	const int v3 = NFS_ISV3(dvp);
 	int rexmit = 0;
 	struct nfsnode *np = VTONFS(vp);
 	nfsstats.rpccnt[NFSPROC_LINK]++;
 	nfsm_reqhead(np, NFSPROC_LINK,
 	    NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(namelen));
 	nfsm_fhtom(np, v3);
 	nfsm_fhtom(VTONFS(dvp), v3);
 	nfsm_strtom(name, namelen, NFS_MAXNAMLEN);
 	nfsm_request1(np, NFSPROC_LINK, l, cred, &rexmit);
 #ifndef NFS_V2_ONLY
 	if (v3) {
 		nfsm_postop_attr(vp, attrflag, 0);
 		nfsm_wcc_data(dvp, wccflag, 0, !error);
 #endif
 	nfsm_reqdone;
 	VTONFS(dvp)->n_flag |= NMODIFIED;
 	if (!attrflag)
 		NFS_INVALIDATE_ATTRCACHE(VTONFS(vp));
 	if (!wccflag)
 		NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
 	/*
 	 * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry.
 	 */
 	if (rexmit && error == EEXIST)
 		error = 0;
 	return error;
 /*
  * nfs hard link create call
  */
 int
 nfs_link(v)
 	void *v;
 	struct vop_link_args /* {
 		struct vnode *a_dvp;
 		struct vnode *a_vp;
 		struct componentname *a_cnp;
 	} */ *ap = v;
 	struct vnode *vp = ap->a_vp;
 	struct vnode *dvp = ap->a_dvp;
 	struct componentname *cnp = ap->a_cnp;
 	int error = 0;
 	if (dvp->v_mount != vp->v_mount) {
 		VOP_ABORTOP(dvp, cnp);
 		vput(dvp);
 		return (EXDEV);
 	if (dvp != vp) {
 		error = vn_lock(vp, LK_EXCLUSIVE);
 		if (error != 0) {
 			VOP_ABORTOP(dvp, cnp);
 			vput(dvp);
 			return error;
 	/*
 	 * Push all writes to the server, so that the attribute cache
 	 * doesn't get "out of sync" with the server.
 	 * XXX There should be a better way!
 	 */
 	VOP_FSYNC(vp, cnp->cn_cred, FSYNC_WAIT, 0, 0);
 	error = nfs_linkrpc(dvp, vp, cnp->cn_nameptr, cnp->cn_namelen,
 	    cnp->cn_cred, curlwp);
 	if (error == 0)
 		cache_purge1(dvp, cnp, 0);
 	PNBUF_PUT(cnp->cn_pnbuf);
 	if (dvp != vp)
 		VOP_UNLOCK(vp, 0);
 	VN_KNOTE(vp, NOTE_LINK);
 	VN_KNOTE(dvp, NOTE_WRITE);
 	vput(dvp);
 	return (error);
 /*
  * nfs symbolic link create call
  */
 int
 nfs_symlink(v)
 	void *v;
 	struct vop_symlink_args /* {
 		struct vnode *a_dvp;
 		struct vnode **a_vpp;
 		struct componentname *a_cnp;
 		struct vattr *a_vap;
 		char *a_target;
 	} */ *ap = v;
 	struct vnode *dvp = ap->a_dvp;
 	struct vattr *vap = ap->a_vap;
 	struct componentname *cnp = ap->a_cnp;
 	struct nfsv2_sattr *sp;
 	u_int32_t *tl;
 	char *cp;
 	int32_t t1, t2;
 	char *bpos, *dpos, *cp2;
 	int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp;
 	struct mbuf *mreq, *mrep, *md, *mb;
 	struct vnode *newvp = (struct vnode *)0;
 	const int v3 = NFS_ISV3(dvp);
 	int rexmit = 0;
 	struct nfsnode *dnp = VTONFS(dvp);
 	*ap->a_vpp = NULL;
 	nfsstats.rpccnt[NFSPROC_SYMLINK]++;
 	slen = strlen(ap->a_target);
 	nfsm_reqhead(dnp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED +
 	    nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3));
 	nfsm_fhtom(dnp, v3);
 	nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
 #ifndef NFS_V2_ONlY
 	if (v3)
 		nfsm_v3attrbuild(vap, false);
 #endif
 	nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN);
 #ifndef NFS_V2_ONlY
 	if (!v3) {
 		nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
 		sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode);
 		sp->sa_uid = nfs_xdrneg1;
 		sp->sa_gid = nfs_xdrneg1;
 		sp->sa_size = nfs_xdrneg1;
 		txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
 		txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
 #endif
 	nfsm_request1(dnp, NFSPROC_SYMLINK, curlwp, cnp->cn_cred,
 	    &rexmit);
 #ifndef NFS_V2_ONlY
 	if (v3) {
 		if (!error)
 			nfsm_mtofh(dvp, newvp, v3, gotvp);
 		nfsm_wcc_data(dvp, wccflag, 0, !error);
 #endif
 	nfsm_reqdone;
 	/*
 	 * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry.
 	 */
 	if (rexmit && error == EEXIST)
 		error = 0;
 	if (error == 0 || error == EEXIST)
 		cache_purge1(dvp, cnp, 0);
 	if (error == 0 && newvp == NULL) {
 		struct nfsnode *np = NULL;
 		error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
 		    cnp->cn_cred, curlwp, &np);
 		if (error == 0)
 			newvp = NFSTOV(np);
 	if (error) {
 		if (newvp != NULL)
 			vput(newvp);
 	} else {
 		*ap->a_vpp = newvp;
 	PNBUF_PUT(cnp->cn_pnbuf);
 	VTONFS(dvp)->n_flag |= NMODIFIED;
 	if (!wccflag)
 		NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
 	VN_KNOTE(dvp, NOTE_WRITE);
 	vput(dvp);
 	return (error);
 /*
  * nfs make dir call
  */
 int
 nfs_mkdir(v)
 	void *v;
 	struct vop_mkdir_args /* {
 		struct vnode *a_dvp;
 		struct vnode **a_vpp;
 		struct componentname *a_cnp;
 		struct vattr *a_vap;
 	} */ *ap = v;
 	struct vnode *dvp = ap->a_dvp;
 	struct vattr *vap = ap->a_vap;
 	struct componentname *cnp = ap->a_cnp;
 	struct nfsv2_sattr *sp;
 	u_int32_t *tl;
 	char *cp;
 	int32_t t1, t2;
 	int len;
 	struct nfsnode *dnp = VTONFS(dvp), *np = (struct nfsnode *)0;
 	struct vnode *newvp = (struct vnode *)0;
 	char *bpos, *dpos, *cp2;
 	int error = 0, wccflag = NFSV3_WCCRATTR;
 	int gotvp = 0;
 	int rexmit = 0;
 	struct mbuf *mreq, *mrep, *md, *mb;
 	const int v3 = NFS_ISV3(dvp);
 	len = cnp->cn_namelen;
 	nfsstats.rpccnt[NFSPROC_MKDIR]++;
 	nfsm_reqhead(dnp, NFSPROC_MKDIR,
 	  NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3));
 	nfsm_fhtom(dnp, v3);
 	nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN);
 #ifndef NFS_V2_ONLY
 	if (v3) {
 		nfsm_v3attrbuild(vap, false);
 	} else
 #endif
 		nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
 		sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode);
 		sp->sa_uid = nfs_xdrneg1;
 		sp->sa_gid = nfs_xdrneg1;
 		sp->sa_size = nfs_xdrneg1;
 		txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
 		txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
 	nfsm_request1(dnp, NFSPROC_MKDIR, curlwp, cnp->cn_cred, &rexmit);
 	if (!error)
 		nfsm_mtofh(dvp, newvp, v3, gotvp);
 	if (v3)
 		nfsm_wcc_data(dvp, wccflag, 0, !error);
 	nfsm_reqdone;
 	VTONFS(dvp)->n_flag |= NMODIFIED;
 	if (!wccflag)
 		NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
 	/*
 	 * Kludge: Map EEXIST => 0 assuming that you have a reply to a retry
 	 * if we can succeed in looking up the directory.
 	 */
 	if ((rexmit && error == EEXIST) || (!error && !gotvp)) {
 		if (newvp) {
 			vput(newvp);
 			newvp = (struct vnode *)0;
 		error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred,
 			curlwp, &np);
 		if (!error) {
 			newvp = NFSTOV(np);
 			if (newvp->v_type != VDIR || newvp == dvp)
 				error = EEXIST;
 	if (error) {
 		if (newvp) {
 			if (dvp != newvp)
 				vput(newvp);
 			else
 				vrele(newvp);
 	} else {
 		VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK);
 		if (cnp->cn_flags & MAKEENTRY)
 			nfs_cache_enter(dvp, newvp, cnp);
 		*ap->a_vpp = newvp;
 	PNBUF_PUT(cnp->cn_pnbuf);
 	vput(dvp);
 	return (error);
 /*
  * nfs remove directory call
  */
 int
 nfs_rmdir(v)
 	void *v;
 	struct vop_rmdir_args /* {
 		struct vnode *a_dvp;
 		struct vnode *a_vp;
 		struct componentname *a_cnp;
 	} */ *ap = v;
 	struct vnode *vp = ap->a_vp;
 	struct vnode *dvp = ap->a_dvp;
 	struct componentname *cnp = ap->a_cnp;
 	u_int32_t *tl;
 	char *cp;
 #ifndef NFS_V2_ONLY
 	int32_t t1;
 	char *cp2;
 #endif
 	int32_t t2;
 	char *bpos, *dpos;
 	int error = 0, wccflag = NFSV3_WCCRATTR;
 	int rexmit = 0;
 	struct mbuf *mreq, *mrep, *md, *mb;
 	const int v3 = NFS_ISV3(dvp);
 	struct nfsnode *dnp;
 	if (dvp == vp) {
 		vrele(dvp);
 		vput(dvp);
 		PNBUF_PUT(cnp->cn_pnbuf);
 		return (EINVAL);
 	nfsstats.rpccnt[NFSPROC_RMDIR]++;
 	dnp = VTONFS(dvp);
 	nfsm_reqhead(dnp, NFSPROC_RMDIR,
 		NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen));
 	nfsm_fhtom(dnp, v3);
 	nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
 	nfsm_request1(dnp, NFSPROC_RMDIR, curlwp, cnp->cn_cred, &rexmit);
 #ifndef NFS_V2_ONLY
 	if (v3)
 		nfsm_wcc_data(dvp, wccflag, 0, !error);
 #endif
 	nfsm_reqdone;
 	PNBUF_PUT(cnp->cn_pnbuf);
 	VTONFS(dvp)->n_flag |= NMODIFIED;
 	if (!wccflag)
 		NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
 	VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK);
 	VN_KNOTE(vp, NOTE_DELETE);
 	cache_purge(vp);
 	vput(vp);
 	vput(dvp);
 	/*
 	 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry.
 	 */
 	if (rexmit && error == ENOENT)
 		error = 0;
 	return (error);
 /*
  * nfs readdir call
  */
 int
 nfs_readdir(v)
 	void *v;
 	struct vop_readdir_args /* {
 		struct vnode *a_vp;
 		struct uio *a_uio;
 		kauth_cred_t a_cred;
 		int *a_eofflag;
 		off_t **a_cookies;
 		int *a_ncookies;
 	} */ *ap = v;
 	struct vnode *vp = ap->a_vp;
 	struct uio *uio = ap->a_uio;
 	struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 	char *base = uio->uio_iov->iov_base;
 	int tresid, error;
 	size_t count, lost;
 	struct dirent *dp;
 	off_t *cookies = NULL;
 	int ncookies = 0, nc;
 	if (vp->v_type != VDIR)
 		return (EPERM);
 	lost = uio->uio_resid & (NFS_DIRFRAGSIZ - 1);
 	count = uio->uio_resid - lost;
 	if (count <= 0)
 		return (EINVAL);
 	/*
 	 * Call nfs_bioread() to do the real work.
 	 */
 	tresid = uio->uio_resid = count;
 	error = nfs_bioread(vp, uio, 0, ap->a_cred,
 		    ap->a_cookies ? NFSBIO_CACHECOOKIES : 0);
 	if (!error && ap->a_cookies) {
 		ncookies = count / 16;
 		cookies = malloc(sizeof (off_t) * ncookies, M_TEMP, M_WAITOK);
 		*ap->a_cookies = cookies;
 	if (!error && uio->uio_resid == tresid) {
 		uio->uio_resid += lost;
 		nfsstats.direofcache_misses++;
 		if (ap->a_cookies)
 			*ap->a_ncookies = 0;
 		*ap->a_eofflag = 1;
 		return (0);
 	if (!error && ap->a_cookies) {
 		/*
 		 * Only the NFS server and emulations use cookies, and they
 		 * load the directory block into system space, so we can
 		 * just look at it directly.
 		 */
 		if (!VMSPACE_IS_KERNEL_P(uio->uio_vmspace) ||
 		    uio->uio_iovcnt != 1)
 			panic("nfs_readdir: lost in space");
 		for (nc = 0; ncookies-- &&
 		     base < (char *)uio->uio_iov->iov_base; nc++){
 			dp = (struct dirent *) base;
 			if (dp->d_reclen == 0)
 				break;
 			if (nmp->nm_flag & NFSMNT_XLATECOOKIE)
 				*(cookies++) = (off_t)NFS_GETCOOKIE32(dp);
 			else
 				*(cookies++) = NFS_GETCOOKIE(dp);
 			base += dp->d_reclen;
 		uio->uio_resid +=
 		    ((char *)uio->uio_iov->iov_base - base);
 		uio->uio_iov->iov_len +=
 		    ((char *)uio->uio_iov->iov_base - base);
 		uio->uio_iov->iov_base = base;
 		*ap->a_ncookies = nc;
 	uio->uio_resid += lost;
 	*ap->a_eofflag = 0;
 	return (error);
 /*
  * Readdir rpc call.
  * Called from below the buffer cache by nfs_doio().
  */
 int
 nfs_readdirrpc(vp, uiop, cred)
 	struct vnode *vp;
 	struct uio *uiop;
 	kauth_cred_t cred;
 	int len, left;
 	struct dirent *dp = NULL;
 	u_int32_t *tl;
 	char *cp;
 	int32_t t1, t2;
 	char *bpos, *dpos, *cp2;
 	struct mbuf *mreq, *mrep, *md, *mb;
 	struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 	struct nfsnode *dnp = VTONFS(vp);
 	u_quad_t fileno;
 	int error = 0, more_dirs = 1, blksiz = 0, bigenough = 1;
 #ifndef NFS_V2_ONLY
 	int attrflag;
 #endif
 	int nrpcs = 0, reclen;
 	const int v3 = NFS_ISV3(vp);
 #ifdef DIAGNOSTIC
 	/*
 	 * Should be called from buffer cache, so only amount of
 	 * NFS_DIRBLKSIZ will be requested.
 	 */
 	if (uiop->uio_iovcnt != 1 || uiop->uio_resid != NFS_DIRBLKSIZ)
 		panic("nfs readdirrpc bad uio");
 #endif
 	/*
 	 * Loop around doing readdir rpc's of size nm_readdirsize
 	 * truncated to a multiple of NFS_DIRFRAGSIZ.
 	 * The stopping criteria is EOF or buffer full.
 	 */
 	while (more_dirs && bigenough) {
 		/*
 		 * Heuristic: don't bother to do another RPC to further
 		 * fill up this block if there is not much room left. (< 50%
 		 * of the readdir RPC size). This wastes some buffer space
 		 * but can save up to 50% in RPC calls.
 		 */
 		if (nrpcs > 0 && uiop->uio_resid < (nmp->nm_readdirsize / 2)) {
 			bigenough = 0;
 			break;
 		nfsstats.rpccnt[NFSPROC_READDIR]++;
 		nfsm_reqhead(dnp, NFSPROC_READDIR, NFSX_FH(v3) +
 			NFSX_READDIR(v3));
 		nfsm_fhtom(dnp, v3);
 #ifndef NFS_V2_ONLY
 		if (v3) {
 			nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
 			if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE) {
 				txdr_swapcookie3(uiop->uio_offset, tl);
 			} else {
 				txdr_cookie3(uiop->uio_offset, tl);
 			tl += 2;
 			*tl++ = dnp->n_cookieverf.nfsuquad[0];
 			*tl++ = dnp->n_cookieverf.nfsuquad[1];
 		} else
 #endif
 			nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 			*tl++ = txdr_unsigned(uiop->uio_offset);
 		*tl = txdr_unsigned(nmp->nm_readdirsize);
 		nfsm_request(dnp, NFSPROC_READDIR, curlwp, cred);
 		nrpcs++;
 #ifndef NFS_V2_ONLY
 		if (v3) {
 			nfsm_postop_attr(vp, attrflag, 0);
 			if (!error) {
 				nfsm_dissect(tl, u_int32_t *,
 * NFSX_UNSIGNED);
 				dnp->n_cookieverf.nfsuquad[0] = *tl++;
 				dnp->n_cookieverf.nfsuquad[1] = *tl;
 			} else {
 				m_freem(mrep);
 				goto nfsmout;
 #endif
 		nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
 		more_dirs = fxdr_unsigned(int, *tl);
 		/* loop thru the dir entries, doctoring them to 4bsd form */
 		while (more_dirs && bigenough) {
 #ifndef NFS_V2_ONLY
 			if (v3) {
 				nfsm_dissect(tl, u_int32_t *,
 * NFSX_UNSIGNED);
 				fileno = fxdr_hyper(tl);
 				len = fxdr_unsigned(int, *(tl + 2));
 			} else
 #endif
 				nfsm_dissect(tl, u_int32_t *,
 * NFSX_UNSIGNED);
 				fileno = fxdr_unsigned(u_quad_t, *tl++);
 				len = fxdr_unsigned(int, *tl);
 			if (len <= 0 || len > NFS_MAXNAMLEN) {
 				error = EBADRPC;
 				m_freem(mrep);
 				goto nfsmout;
 			/* for cookie stashing */
 			reclen = _DIRENT_RECLEN(dp, len) + 2 * sizeof(off_t);
 			left = NFS_DIRFRAGSIZ - blksiz;
 			if (reclen > left) {
 				memset(uiop->uio_iov->iov_base, 0, left);
 				dp->d_reclen += left;
 				UIO_ADVANCE(uiop, left);
 				blksiz = 0;
 				NFS_STASHCOOKIE(dp, uiop->uio_offset);
 			if (reclen > uiop->uio_resid)
 				bigenough = 0;
 			if (bigenough) {
 				int tlen;
 				dp = (struct dirent *)uiop->uio_iov->iov_base;
 				dp->d_fileno = fileno;
 				dp->d_namlen = len;
 				dp->d_reclen = reclen;
 				dp->d_type = DT_UNKNOWN;
 				blksiz += reclen;
 				if (blksiz == NFS_DIRFRAGSIZ)
 					blksiz = 0;
 				UIO_ADVANCE(uiop, DIRHDSIZ);
 				nfsm_mtouio(uiop, len);
 				tlen = reclen - (DIRHDSIZ + len);
 				(void)memset(uiop->uio_iov->iov_base, 0, tlen);
 				UIO_ADVANCE(uiop, tlen);
 			} else
 				nfsm_adv(nfsm_rndup(len));
 #ifndef NFS_V2_ONLY
 			if (v3) {
 				nfsm_dissect(tl, u_int32_t *,
 * NFSX_UNSIGNED);
 			} else
 #endif
 				nfsm_dissect(tl, u_int32_t *,
 * NFSX_UNSIGNED);
 			if (bigenough) {
 #ifndef NFS_V2_ONLY
 				if (v3) {
 					if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE)
 						uiop->uio_offset =
 						    fxdr_swapcookie3(tl);
 					else
 						uiop->uio_offset =
 						    fxdr_cookie3(tl);
 				else
 #endif
 					uiop->uio_offset =
 					    fxdr_unsigned(off_t, *tl);
 				NFS_STASHCOOKIE(dp, uiop->uio_offset);
 			if (v3)
 				tl += 2;
 			else
 				tl++;
 			more_dirs = fxdr_unsigned(int, *tl);
 		/*
 		 * If at end of rpc data, get the eof boolean
 		 */
 		if (!more_dirs) {
 			nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
 			more_dirs = (fxdr_unsigned(int, *tl) == 0);
 			/*
 			 * kludge: if we got no entries, treat it as EOF.
 			 * some server sometimes send a reply without any
 			 * entries or EOF.
 			 * although it might mean the server has very long name,
 			 * we can't handle such entries anyway.
 			 */
 			if (uiop->uio_resid >= NFS_DIRBLKSIZ)
 				more_dirs = 0;
 		m_freem(mrep);
 	/*
 	 * Fill last record, iff any, out to a multiple of NFS_DIRFRAGSIZ
 	 * by increasing d_reclen for the last record.
 	 */
 	if (blksiz > 0) {
 		left = NFS_DIRFRAGSIZ - blksiz;
 		memset(uiop->uio_iov->iov_base, 0, left);
 		dp->d_reclen += left;
 		NFS_STASHCOOKIE(dp, uiop->uio_offset);
 		UIO_ADVANCE(uiop, left);
 	/*
 	 * We are now either at the end of the directory or have filled the
 	 * block.
 	 */
 	if (bigenough) {
 		dnp->n_direofoffset = uiop->uio_offset;
 		dnp->n_flag |= NEOFVALID;
 nfsmout:
 	return (error);
 #ifndef NFS_V2_ONLY
 /*
  * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc().
  */
 int
 nfs_readdirplusrpc(vp, uiop, cred)
 	struct vnode *vp;
 	struct uio *uiop;
 	kauth_cred_t cred;
 	int len, left;
 	struct dirent *dp = NULL;
 	u_int32_t *tl;
 	char *cp;
 	int32_t t1, t2;
 	struct vnode *newvp;
 	char *bpos, *dpos, *cp2;
 	struct mbuf *mreq, *mrep, *md, *mb;
 	struct nameidata nami, *ndp = &nami;
 	struct componentname *cnp = &ndp->ni_cnd;
 	struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 	struct nfsnode *dnp = VTONFS(vp), *np;
 	nfsfh_t *fhp;
 	u_quad_t fileno;
 	int error = 0, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i;
 	int attrflag, fhsize, nrpcs = 0, reclen;
 	struct nfs_fattr fattr, *fp;
 #ifdef DIAGNOSTIC
 	if (uiop->uio_iovcnt != 1 || uiop->uio_resid != NFS_DIRBLKSIZ)
 		panic("nfs readdirplusrpc bad uio");
 #endif
 	ndp->ni_dvp = vp;
 	newvp = NULLVP;
 	/*
 	 * Loop around doing readdir rpc's of size nm_readdirsize
 	 * truncated to a multiple of NFS_DIRFRAGSIZ.
 	 * The stopping criteria is EOF or buffer full.
 	 */
 	while (more_dirs && bigenough) {
 		if (nrpcs > 0 && uiop->uio_resid < (nmp->nm_readdirsize / 2)) {
 			bigenough = 0;
 			break;
 		nfsstats.rpccnt[NFSPROC_READDIRPLUS]++;
 		nfsm_reqhead(dnp, NFSPROC_READDIRPLUS,
 			NFSX_FH(1) + 6 * NFSX_UNSIGNED);
 		nfsm_fhtom(dnp, 1);
  		nfsm_build(tl, u_int32_t *, 6 * NFSX_UNSIGNED);
 		if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE) {
 			txdr_swapcookie3(uiop->uio_offset, tl);
 		} else {
 			txdr_cookie3(uiop->uio_offset, tl);
 		tl += 2;
 		*tl++ = dnp->n_cookieverf.nfsuquad[0];
 		*tl++ = dnp->n_cookieverf.nfsuquad[1];
 		*tl++ = txdr_unsigned(nmp->nm_readdirsize);
 		*tl = txdr_unsigned(nmp->nm_rsize);
 		nfsm_request(dnp, NFSPROC_READDIRPLUS, curlwp, cred);
 		nfsm_postop_attr(vp, attrflag, 0);
 		if (error) {
 			m_freem(mrep);
 			goto nfsmout;
 		nrpcs++;
 		nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
 		dnp->n_cookieverf.nfsuquad[0] = *tl++;
 		dnp->n_cookieverf.nfsuquad[1] = *tl++;
 		more_dirs = fxdr_unsigned(int, *tl);
 		/* loop thru the dir entries, doctoring them to 4bsd form */
 		while (more_dirs && bigenough) {
 			nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
 			fileno = fxdr_hyper(tl);
 			len = fxdr_unsigned(int, *(tl + 2));
 			if (len <= 0 || len > NFS_MAXNAMLEN) {
 				error = EBADRPC;
 				m_freem(mrep);
 				goto nfsmout;
 			/* for cookie stashing */
 			reclen = _DIRENT_RECLEN(dp, len) + 2 * sizeof(off_t);
 			left = NFS_DIRFRAGSIZ - blksiz;
 			if (reclen > left) {
 				/*
 				 * DIRFRAGSIZ is aligned, no need to align
 				 * again here.
 				 */
 				memset(uiop->uio_iov->iov_base, 0, left);
 				dp->d_reclen += left;
 				UIO_ADVANCE(uiop, left);
 				NFS_STASHCOOKIE(dp, uiop->uio_offset);
 				blksiz = 0;
 			if (reclen > uiop->uio_resid)
 				bigenough = 0;
 			if (bigenough) {
 				int tlen;
 				dp = (struct dirent *)uiop->uio_iov->iov_base;
 				dp->d_fileno = fileno;
 				dp->d_namlen = len;
 				dp->d_reclen = reclen;
 				dp->d_type = DT_UNKNOWN;
 				blksiz += reclen;
 				if (blksiz == NFS_DIRFRAGSIZ)
 					blksiz = 0;
 				UIO_ADVANCE(uiop, DIRHDSIZ);
 				nfsm_mtouio(uiop, len);
 				tlen = reclen - (DIRHDSIZ + len);
 				(void)memset(uiop->uio_iov->iov_base, 0, tlen);
 				UIO_ADVANCE(uiop, tlen);
 				cnp->cn_nameptr = dp->d_name;
 				cnp->cn_namelen = dp->d_namlen;
 			} else
 				nfsm_adv(nfsm_rndup(len));
 			nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
 			if (bigenough) {
 				if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE)
 					uiop->uio_offset =
 						fxdr_swapcookie3(tl);
 				else
 					uiop->uio_offset =
 						fxdr_cookie3(tl);
 				NFS_STASHCOOKIE(dp, uiop->uio_offset);
 			tl += 2;
 			/*
 			 * Since the attributes are before the file handle
 			 * (sigh), we must skip over the attributes and then
 			 * come back and get them.
 			 */
 			attrflag = fxdr_unsigned(int, *tl);
 			if (attrflag) {
 			    nfsm_dissect(fp, struct nfs_fattr *, NFSX_V3FATTR);
 			    memcpy(&fattr, fp, NFSX_V3FATTR);
 			    nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
 			    doit = fxdr_unsigned(int, *tl);
 			    if (doit) {
 				nfsm_getfh(fhp, fhsize, 1);
 				if (NFS_CMPFH(dnp, fhp, fhsize)) {
 				    VREF(vp);
 				    newvp = vp;
 				    np = dnp;
 				} else {
 				    error = nfs_nget1(vp->v_mount, fhp,
 					fhsize, &np, LK_NOWAIT);
 				    if (!error)
 					newvp = NFSTOV(np);
 				if (!error) {
 				    const char *xcp;
 				    nfs_loadattrcache(&newvp, &fattr, 0, 0);
 				    if (bigenough) {
 					dp->d_type =
 					   IFTODT(VTTOIF(np->n_vattr->va_type));
 					if (cnp->cn_namelen <= NCHNAMLEN) {
 					    ndp->ni_vp = newvp;
 					    xcp = cnp->cn_nameptr +
 						cnp->cn_namelen;
 					    cnp->cn_hash =
 					       namei_hash(cnp->cn_nameptr, &xcp);
 					    nfs_cache_enter(ndp->ni_dvp,
 						ndp->ni_vp, cnp);
 				error = 0;
 			} else {
 			    /* Just skip over the file handle */
 			    nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
 			    i = fxdr_unsigned(int, *tl);
 			    nfsm_adv(nfsm_rndup(i));
 			if (newvp != NULLVP) {
 			    if (newvp == vp)
 				vrele(newvp);
 			    else
 				vput(newvp);
 			    newvp = NULLVP;
 			nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
 			more_dirs = fxdr_unsigned(int, *tl);
 		/*
 		 * If at end of rpc data, get the eof boolean
 		 */
 		if (!more_dirs) {
 			nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
 			more_dirs = (fxdr_unsigned(int, *tl) == 0);
 			/*
 			 * kludge: see a comment in nfs_readdirrpc.
 			 */
 			if (uiop->uio_resid >= NFS_DIRBLKSIZ)
 				more_dirs = 0;
 		m_freem(mrep);
 	/*
 	 * Fill last record, iff any, out to a multiple of NFS_DIRFRAGSIZ
 	 * by increasing d_reclen for the last record.
 	 */
 	if (blksiz > 0) {
 		left = NFS_DIRFRAGSIZ - blksiz;
 		memset(uiop->uio_iov->iov_base, 0, left);
 		dp->d_reclen += left;
 		NFS_STASHCOOKIE(dp, uiop->uio_offset);
 		UIO_ADVANCE(uiop, left);
 	/*
 	 * We are now either at the end of the directory or have filled the
 	 * block.
 	 */
 	if (bigenough) {
 		dnp->n_direofoffset = uiop->uio_offset;
 		dnp->n_flag |= NEOFVALID;
 nfsmout:
 	if (newvp != NULLVP) {
 		if(newvp == vp)
 		    vrele(newvp);
 		else
 		    vput(newvp);
 	return (error);
 #endif
 /*
  * Silly rename. To make the NFS filesystem that is stateless look a little
  * more like the "ufs" a remove of an active vnode is translated to a rename
  * to a funny looking filename that is removed by nfs_inactive on the
  * nfsnode. There is the potential for another process on a different client
  * to create the same funny name between the nfs_lookitup() fails and the
  * nfs_rename() completes, but...
  */
 int
 nfs_sillyrename(dvp, vp, cnp, dolink)
 	struct vnode *dvp, *vp;
 	struct componentname *cnp;
 	bool dolink;
 	struct sillyrename *sp;
 	struct nfsnode *np;
 	int error;
 	short pid;
 	cache_purge(dvp);
 	np = VTONFS(vp);
 #ifndef DIAGNOSTIC
 	if (vp->v_type == VDIR)
 		panic("nfs: sillyrename dir");
 #endif
 	sp = kmem_alloc(sizeof(*sp), KM_SLEEP);
 	sp->s_cred = kauth_cred_dup(cnp->cn_cred);
 	sp->s_dvp = dvp;
 	VREF(dvp);
 	/* Fudge together a funny name */
 	pid = curlwp->l_proc->p_pid;
 	memcpy(sp->s_name, ".nfsAxxxx4.4", 13);
 	sp->s_namlen = 12;
 	sp->s_name[8] = hexdigits[pid & 0xf];
 	sp->s_name[7] = hexdigits[(pid >> 4) & 0xf];
 	sp->s_name[6] = hexdigits[(pid >> 8) & 0xf];
 	sp->s_name[5] = hexdigits[(pid >> 12) & 0xf];
 	/* Try lookitups until we get one that isn't there */
 	while (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 		curlwp, (struct nfsnode **)0) == 0) {
 		sp->s_name[4]++;
 		if (sp->s_name[4] > 'z') {
 			error = EINVAL;
 			goto bad;
 	if (dolink) {
 		error = nfs_linkrpc(dvp, vp, sp->s_name, sp->s_namlen,
 		    sp->s_cred, curlwp);
 		/*
 		 * nfs_request maps NFSERR_NOTSUPP to ENOTSUP.
 		 */
 		if (error == ENOTSUP) {
 			error = nfs_renameit(dvp, cnp, sp);
 	} else {
 		error = nfs_renameit(dvp, cnp, sp);
 	if (error)
 		goto bad;
 	error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
 		curlwp, &np);
 	np->n_sillyrename = sp;
 	return (0);
 bad:
 	vrele(sp->s_dvp);
 	kauth_cred_free(sp->s_cred);
 	kmem_free(sp, sizeof(*sp));
 	return (error);
 /*
  * Look up a file name and optionally either update the file handle or
  * allocate an nfsnode, depending on the value of npp.
  * npp == NULL	--> just do the lookup
  * *npp == NULL --> allocate a new nfsnode and make sure attributes are
  *			handled too
  * *npp != NULL --> update the file handle in the vnode
  */
 int
 nfs_lookitup(dvp, name, len, cred, l, npp)
 	struct vnode *dvp;
 	const char *name;
 	int len;
 	kauth_cred_t cred;
 	struct lwp *l;
 	struct nfsnode **npp;
 	u_int32_t *tl;
 	char *cp;
 	int32_t t1, t2;
 	struct vnode *newvp = (struct vnode *)0;
 	struct nfsnode *np, *dnp = VTONFS(dvp);
 	char *bpos, *dpos, *cp2;
 	int error = 0, fhlen;
 #ifndef NFS_V2_ONLY
 	int attrflag;
 #endif
 	struct mbuf *mreq, *mrep, *md, *mb;
 	nfsfh_t *nfhp;
 	const int v3 = NFS_ISV3(dvp);
 	nfsstats.rpccnt[NFSPROC_LOOKUP]++;
 	nfsm_reqhead(dnp, NFSPROC_LOOKUP,
 		NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len));
 	nfsm_fhtom(dnp, v3);
 	nfsm_strtom(name, len, NFS_MAXNAMLEN);
 	nfsm_request(dnp, NFSPROC_LOOKUP, l, cred);
 	if (npp && !error) {
 		nfsm_getfh(nfhp, fhlen, v3);
 		if (*npp) {
 		    np = *npp;
 		    if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) {
 			kmem_free(np->n_fhp, np->n_fhsize);
 			np->n_fhp = &np->n_fh;
 #if NFS_SMALLFH < NFSX_V3FHMAX
 		    else if (np->n_fhsize <= NFS_SMALLFH && fhlen > NFS_SMALLFH)
 			np->n_fhp = kmem_alloc(fhlen, KM_SLEEP);
 #endif
 		    memcpy(np->n_fhp, nfhp, fhlen);
 		    np->n_fhsize = fhlen;
 		    newvp = NFSTOV(np);
 		} else if (NFS_CMPFH(dnp, nfhp, fhlen)) {
 		    VREF(dvp);
 		    newvp = dvp;
 		    np = dnp;
 		} else {
 		    error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np);
 		    if (error) {
 			m_freem(mrep);
 			return (error);
 		    newvp = NFSTOV(np);
 #ifndef NFS_V2_ONLY
 		if (v3) {
 			nfsm_postop_attr(newvp, attrflag, 0);
 			if (!attrflag && *npp == NULL) {
 				m_freem(mrep);
 				vput(newvp);
 				return (ENOENT);
 		} else
 #endif
 			nfsm_loadattr(newvp, (struct vattr *)0, 0);
 	nfsm_reqdone;
 	if (npp && *npp == NULL) {
 		if (error) {
 			if (newvp)
 				vput(newvp);
 		} else
 			*npp = np;
 	return (error);
 #ifndef NFS_V2_ONLY
 /*
  * Nfs Version 3 commit rpc
  */
 int
 nfs_commit(vp, offset, cnt, l)
 	struct vnode *vp;
 	off_t offset;
 	uint32_t cnt;
 	struct lwp *l;
 	char *cp;
 	u_int32_t *tl;
 	int32_t t1, t2;
 	struct nfsmount *nmp = VFSTONFS(vp->v_mount);
 	char *bpos, *dpos, *cp2;
 	int error = 0, wccflag = NFSV3_WCCRATTR;
 	struct mbuf *mreq, *mrep, *md, *mb;
 	struct nfsnode *np;
 	KASSERT(NFS_ISV3(vp));
 #ifdef NFS_DEBUG_COMMIT
 	printf("commit %lu - %lu\n", (unsigned long)offset,
 	    (unsigned long)(offset + cnt));
 #endif
 	mutex_enter(&nmp->nm_lock);
 	if ((nmp->nm_iflag & NFSMNT_HASWRITEVERF) == 0) {
 		mutex_exit(&nmp->nm_lock);
 		return (0);
 	mutex_exit(&nmp->nm_lock);
 	nfsstats.rpccnt[NFSPROC_COMMIT]++;
 	np = VTONFS(vp);
 	nfsm_reqhead(np, NFSPROC_COMMIT, NFSX_FH(1));
 	nfsm_fhtom(np, 1);
 	nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
 	txdr_hyper(offset, tl);
 	tl += 2;
 	*tl = txdr_unsigned(cnt);
 	nfsm_request(np, NFSPROC_COMMIT, l, np->n_wcred);
 	nfsm_wcc_data(vp, wccflag, NAC_NOTRUNC, false);
 	if (!error) {
 		nfsm_dissect(tl, u_int32_t *, NFSX_V3WRITEVERF);
 		mutex_enter(&nmp->nm_lock);
 		if ((nmp->nm_iflag & NFSMNT_STALEWRITEVERF) ||
 		    memcmp(nmp->nm_writeverf, tl, NFSX_V3WRITEVERF)) {
 			memcpy(nmp->nm_writeverf, tl, NFSX_V3WRITEVERF);
 			error = NFSERR_STALEWRITEVERF;
 			nmp->nm_iflag |= NFSMNT_STALEWRITEVERF;
 		mutex_exit(&nmp->nm_lock);
 	nfsm_reqdone;
 	return (error);
 #endif
 /*
  * Kludge City..
  * - make nfs_bmap() essentially a no-op that does no translation
  * - do nfs_strategy() by doing I/O with nfs_readrpc/nfs_writerpc
  *   (Maybe I could use the process's page mapping, but I was concerned that
  *    Kernel Write might not be enabled and also figured copyout() would do
  *    a lot more work than memcpy() and also it currently happens in the
  *    context of the swapper process (2).
  */
 int
 nfs_bmap(v)
 	void *v;
 	struct vop_bmap_args /* {
 		struct vnode *a_vp;
 		daddr_t  a_bn;
 		struct vnode **a_vpp;
 		daddr_t *a_bnp;
 		int *a_runp;
 	} */ *ap = v;
 	struct vnode *vp = ap->a_vp;
 	int bshift = vp->v_mount->mnt_fs_bshift - vp->v_mount->mnt_dev_bshift;
 	if (ap->a_vpp != NULL)
 		*ap->a_vpp = vp;
 	if (ap->a_bnp != NULL)
 		*ap->a_bnp = ap->a_bn << bshift;
 	if (ap->a_runp != NULL)
 		*ap->a_runp = 1024 * 1024; /* XXX */
 	return (0);
 /*
  * Strategy routine.
  * For async requests when nfsiod(s) are running, queue the request by
  * calling nfs_asyncio(), otherwise just all nfs_doio() to do the
  * request.
  */
 int
 nfs_strategy(v)
 	void *v;
 	struct vop_strategy_args *ap = v;
 	struct buf *bp = ap->a_bp;
 	int error = 0;
 	if ((bp->b_flags & (B_PHYS|B_ASYNC)) == (B_PHYS|B_ASYNC))
 		panic("nfs physio/async");
 	/*
 	 * If the op is asynchronous and an i/o daemon is waiting
 	 * queue the request, wake it up and wait for completion
 	 * otherwise just do it ourselves.
 	 */
 	if ((bp->b_flags & B_ASYNC) == 0 || nfs_asyncio(bp))
 		error = nfs_doio(bp);
 	return (error);
 /*
  * fsync vnode op. Just call nfs_flush() with commit == 1.
  */
 /* ARGSUSED */
 int
 nfs_fsync(v)
 	void *v;
 	struct vop_fsync_args /* {
 		struct vnodeop_desc *a_desc;
 		struct vnode * a_vp;
 		kauth_cred_t  a_cred;
 		int  a_flags;
 		off_t offlo;
 		off_t offhi;
 		struct lwp * a_l;
 	} */ *ap = v;
 	struct vnode *vp = ap->a_vp;
 	if (vp->v_type != VREG)
 		return 0;
 	return (nfs_flush(vp, ap->a_cred,
 	    (ap->a_flags & FSYNC_WAIT) != 0 ? MNT_WAIT : 0, curlwp, 1));
 /*
  * Flush all the data associated with a vnode.
  */
 int
 nfs_flush(struct vnode *vp, kauth_cred_t cred, int waitfor, struct lwp *l,
     int commit)
 	struct nfsnode *np = VTONFS(vp);
 	int error;
 	int flushflags = PGO_ALLPAGES|PGO_CLEANIT|PGO_SYNCIO;
 	UVMHIST_FUNC("nfs_flush"); UVMHIST_CALLED(ubchist);
 	mutex_enter(&vp->v_interlock);
 	error = VOP_PUTPAGES(vp, 0, 0, flushflags);
 	if (np->n_flag & NWRITEERR) {
 		error = np->n_error;
 		np->n_flag &= ~NWRITEERR;
 	UVMHIST_LOG(ubchist, "returning %d", error,0,0,0);
 	return (error);
 /*
  * Return POSIX pathconf information applicable to nfs.
  * N.B. The NFS V2 protocol doesn't support this RPC.
  */
 /* ARGSUSED */
 int
 nfs_pathconf(v)
 	void *v;
 	struct vop_pathconf_args /* {
 		struct vnode *a_vp;
 		int a_name;
 		register_t *a_retval;
 	} */ *ap = v;
 	struct nfsv3_pathconf *pcp;
 	struct vnode *vp = ap->a_vp;
 	struct mbuf *mreq, *mrep, *md, *mb;
 	int32_t t1, t2;
 	u_int32_t *tl;
 	char *bpos, *dpos, *cp, *cp2;
 	int error = 0, attrflag;
 #ifndef NFS_V2_ONLY
 	struct nfsmount *nmp;
 	unsigned int l;
 	u_int64_t maxsize;
 #endif
 	const int v3 = NFS_ISV3(vp);
 	struct nfsnode *np = VTONFS(vp);
 	switch (ap->a_name) {
 		/* Names that can be resolved locally. */
 	case _PC_PIPE_BUF:
 		*ap->a_retval = PIPE_BUF;
 		break;
 	case _PC_SYNC_IO:
 		*ap->a_retval = 1;
 		break;
 	/* Names that cannot be resolved locally; do an RPC, if possible. */
 	case _PC_LINK_MAX:
 	case _PC_NAME_MAX:
 	case _PC_CHOWN_RESTRICTED:
 	case _PC_NO_TRUNC:
 		if (!v3) {
 			error = EINVAL;
 			break;
 		nfsstats.rpccnt[NFSPROC_PATHCONF]++;
 		nfsm_reqhead(np, NFSPROC_PATHCONF, NFSX_FH(1));
 		nfsm_fhtom(np, 1);
 		nfsm_request(np, NFSPROC_PATHCONF,
 		    curlwp, curlwp->l_cred);	/* XXX */
 		nfsm_postop_attr(vp, attrflag, 0);
 		if (!error) {
 			nfsm_dissect(pcp, struct nfsv3_pathconf *,
 			    NFSX_V3PATHCONF);
 			switch (ap->a_name) {
 			case _PC_LINK_MAX:
 				*ap->a_retval =
 				    fxdr_unsigned(register_t, pcp->pc_linkmax);
 				break;
 			case _PC_NAME_MAX:
 				*ap->a_retval =
 				    fxdr_unsigned(register_t, pcp->pc_namemax);
 				break;
 			case _PC_CHOWN_RESTRICTED:
 				*ap->a_retval =
 				    (pcp->pc_chownrestricted == nfs_true);
 				break;
 			case _PC_NO_TRUNC:
 				*ap->a_retval =
 				    (pcp->pc_notrunc == nfs_true);
 				break;
 		nfsm_reqdone;
 		break;
 	case _PC_FILESIZEBITS:
 #ifndef NFS_V2_ONLY
 		if (v3) {
 			nmp = VFSTONFS(vp->v_mount);
 			if ((nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0)
 				if ((error = nfs_fsinfo(nmp, vp,
 				    curlwp->l_cred, curlwp)) != 0) /* XXX */
 					break;
 			for (l = 0, maxsize = nmp->nm_maxfilesize;
 			    (maxsize >> l) > 0; l++)
 			*ap->a_retval = l + 1;
 		} else
 #endif
 			*ap->a_retval = 32;	/* NFS V2 limitation */
 		break;
 	default:
 		error = EINVAL;
 		break;
 	return (error);
 /*
  * NFS advisory byte-level locks.
  */
 int
 nfs_advlock(v)
 	void *v;
 	struct vop_advlock_args /* {
 		struct vnode *a_vp;
 		void *a_id;
 		int  a_op;
 		struct flock *a_fl;
 		int  a_flags;
 	} */ *ap = v;
 	struct nfsnode *np = VTONFS(ap->a_vp);
 	return lf_advlock(ap, &np->n_lockf, np->n_size);
 /*
  * Print out the contents of an nfsnode.
  */
 int
 nfs_print(v)
 	void *v;
 	struct vop_print_args /* {
 		struct vnode *a_vp;
 	} */ *ap = v;
 	struct vnode *vp = ap->a_vp;
 	struct nfsnode *np = VTONFS(vp);
 	printf("tag VT_NFS, fileid %lld fsid 0x%lx",
 	    (unsigned long long)np->n_vattr->va_fileid, np->n_vattr->va_fsid);
 	if (vp->v_type == VFIFO)
 		fifo_printinfo(vp);
 	printf("\n");
 	return (0);
 /*
  * nfs unlock wrapper.
  */
 int
 nfs_unlock(void *v)
 	struct vop_unlock_args /* {
 		struct vnode *a_vp;
 		int a_flags;
 	} */ *ap = v;
 	struct vnode *vp = ap->a_vp;
 	/*
 	 * VOP_UNLOCK can be called by nfs_loadattrcache
 	 * with v_data == 0.
 	 */
 	if (VTONFS(vp)) {
 		nfs_delayedtruncate(vp);
 	return genfs_unlock(v);
 /*
  * nfs special file access vnode op.
  * Essentially just get vattr and then imitate iaccess() since the device is
  * local to the client.
  */
 int
 nfsspec_access(v)
 	void *v;
 	struct vop_access_args /* {
 		struct vnode *a_vp;
 		int  a_mode;
 		kauth_cred_t a_cred;
 		struct lwp *a_l;
 	} */ *ap = v;
 	struct vattr va;
 	struct vnode *vp = ap->a_vp;
 	int error;
 	error = VOP_GETATTR(vp, &va, ap->a_cred);
 	if (error)
 		return (error);
         /*
 	 * Disallow write attempts on filesystems mounted read-only;
 	 * unless the file is a socket, fifo, or a block or character
 	 * device resident on the filesystem.
 	 */
 	if ((ap->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
 		switch (vp->v_type) {
 		case VREG:
 		case VDIR:
 		case VLNK:
 			return (EROFS);
 		default:
 			break;
 	return (vaccess(va.va_type, va.va_mode,
 	    va.va_uid, va.va_gid, ap->a_mode, ap->a_cred));
 /*
  * Read wrapper for special devices.
  */
 int
 nfsspec_read(v)
 	void *v;
 	struct vop_read_args /* {
 		struct vnode *a_vp;
 		struct uio *a_uio;
 		int  a_ioflag;
 		kauth_cred_t a_cred;
 	} */ *ap = v;
 	struct nfsnode *np = VTONFS(ap->a_vp);
 	/*
 	 * Set access flag.
 	 */
 	np->n_flag |= NACC;
 	getnanotime(&np->n_atim);
 	return (VOCALL(spec_vnodeop_p, VOFFSET(vop_read), ap));
 /*
  * Write wrapper for special devices.
  */
 int
 nfsspec_write(v)
 	void *v;
 	struct vop_write_args /* {
 		struct vnode *a_vp;
 		struct uio *a_uio;
 		int  a_ioflag;
 		kauth_cred_t a_cred;
 	} */ *ap = v;
 	struct nfsnode *np = VTONFS(ap->a_vp);
 	/*
 	 * Set update flag.
 	 */
 	np->n_flag |= NUPD;
 	getnanotime(&np->n_mtim);
 	return (VOCALL(spec_vnodeop_p, VOFFSET(vop_write), ap));
 /*
  * Close wrapper for special devices.
  * Update the times on the nfsnode then do device close.
  */
 int
 nfsspec_close(v)
 	void *v;
 	struct vop_close_args /* {
 		struct vnode *a_vp;
 		int  a_fflag;
 		kauth_cred_t a_cred;
 		struct lwp *a_l;
 	} */ *ap = v;
 	struct vnode *vp = ap->a_vp;
 	struct nfsnode *np = VTONFS(vp);
 	struct vattr vattr;
 	if (np->n_flag & (NACC | NUPD)) {
 		np->n_flag |= NCHG;
 		if (vp->v_usecount == 1 &&
 		    (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
 			VATTR_NULL(&vattr);
 			if (np->n_flag & NACC)
 				vattr.va_atime = np->n_atim;
 			if (np->n_flag & NUPD)
 				vattr.va_mtime = np->n_mtim;
 			(void)VOP_SETATTR(vp, &vattr, ap->a_cred);
 	return (VOCALL(spec_vnodeop_p, VOFFSET(vop_close), ap));
 /*
  * Read wrapper for fifos.
  */
 int
 nfsfifo_read(v)
 	void *v;
 	struct vop_read_args /* {
 		struct vnode *a_vp;
 		struct uio *a_uio;
 		int  a_ioflag;
 		kauth_cred_t a_cred;
 	} */ *ap = v;
 	struct nfsnode *np = VTONFS(ap->a_vp);
 	/*
 	 * Set access flag.
 	 */
 	np->n_flag |= NACC;
 	getnanotime(&np->n_atim);
 	return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_read), ap));
 /*
  * Write wrapper for fifos.
  */
 int
 nfsfifo_write(v)
 	void *v;
 	struct vop_write_args /* {
 		struct vnode *a_vp;
 		struct uio *a_uio;
 		int  a_ioflag;
 		kauth_cred_t a_cred;
 	} */ *ap = v;
 	struct nfsnode *np = VTONFS(ap->a_vp);
 	/*
 	 * Set update flag.
 	 */
 	np->n_flag |= NUPD;
 	getnanotime(&np->n_mtim);
 	return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_write), ap));
 /*
  * Close wrapper for fifos.
  * Update the times on the nfsnode then do fifo close.
  */
 int
 nfsfifo_close(v)
 	void *v;
 	struct vop_close_args /* {
 		struct vnode *a_vp;
 		int  a_fflag;
 		kauth_cred_t a_cred;
 		struct lwp *a_l;
 	} */ *ap = v;
 	struct vnode *vp = ap->a_vp;
 	struct nfsnode *np = VTONFS(vp);
 	struct vattr vattr;
 	if (np->n_flag & (NACC | NUPD)) {
 		struct timespec ts;
 		getnanotime(&ts);
 		if (np->n_flag & NACC)
 			np->n_atim = ts;
 		if (np->n_flag & NUPD)
 			np->n_mtim = ts;
 		np->n_flag |= NCHG;
 		if (vp->v_usecount == 1 &&
 		    (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
 			VATTR_NULL(&vattr);
 			if (np->n_flag & NACC)
 				vattr.va_atime = np->n_atim;
 			if (np->n_flag & NUPD)
 				vattr.va_mtime = np->n_mtim;
 			(void)VOP_SETATTR(vp, &vattr, ap->a_cred);
 	return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_close), ap));