Index: stable/11/sys/fs/nfsserver/nfs_nfsdport.c
===================================================================
--- stable/11/sys/fs/nfsserver/nfs_nfsdport.c	(revision 312419)
+++ stable/11/sys/fs/nfsserver/nfs_nfsdport.c	(revision 312420)
@@ -1,3439 +1,3422 @@
 /*-
  * 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.
  * 4. 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.
  *
  */
 
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
 #include <sys/capsicum.h>
 
 /*
  * Functions that perform the vfs operations required by the routines in
  * nfsd_serv.c. It is hoped that this change will make the server more
  * portable.
  */
 
 #include <fs/nfs/nfsport.h>
 #include <sys/hash.h>
 #include <sys/sysctl.h>
 #include <nlm/nlm_prot.h>
 #include <nlm/nlm.h>
 
 FEATURE(nfsd, "NFSv4 server");
 
 extern u_int32_t newnfs_true, newnfs_false, newnfs_xdrneg1;
 extern int nfsrv_useacl;
 extern int newnfs_numnfsd;
 extern struct mount nfsv4root_mnt;
 extern struct nfsrv_stablefirst nfsrv_stablefirst;
 extern void (*nfsd_call_servertimer)(void);
 extern SVCPOOL	*nfsrvd_pool;
 extern struct nfsv4lock nfsd_suspend_lock;
 extern struct nfsclienthashhead *nfsclienthash;
 extern struct nfslockhashhead *nfslockhash;
 extern struct nfssessionhash *nfssessionhash;
 extern int nfsrv_sessionhashsize;
 extern struct nfsstatsv1 nfsstatsv1;
 struct vfsoptlist nfsv4root_opt, nfsv4root_newopt;
 NFSDLOCKMUTEX;
 struct nfsrchash_bucket nfsrchash_table[NFSRVCACHE_HASHSIZE];
 struct nfsrchash_bucket nfsrcahash_table[NFSRVCACHE_HASHSIZE];
 struct mtx nfsrc_udpmtx;
 struct mtx nfs_v4root_mutex;
 struct nfsrvfh nfs_rootfh, nfs_pubfh;
 int nfs_pubfhset = 0, nfs_rootfhset = 0;
 struct proc *nfsd_master_proc = NULL;
 int nfsd_debuglevel = 0;
 static pid_t nfsd_master_pid = (pid_t)-1;
 static char nfsd_master_comm[MAXCOMLEN + 1];
 static struct timeval nfsd_master_start;
 static uint32_t nfsv4_sysid = 0;
 
 static int nfssvc_srvcall(struct thread *, struct nfssvc_args *,
     struct ucred *);
 
 int nfsrv_enable_crossmntpt = 1;
 static int nfs_commit_blks;
 static int nfs_commit_miss;
 extern int nfsrv_issuedelegs;
 extern int nfsrv_dolocallocks;
 extern int nfsd_enable_stringtouid;
 
 SYSCTL_NODE(_vfs, OID_AUTO, nfsd, CTLFLAG_RW, 0, "NFS server");
 SYSCTL_INT(_vfs_nfsd, OID_AUTO, mirrormnt, CTLFLAG_RW,
     &nfsrv_enable_crossmntpt, 0, "Enable nfsd to cross mount points");
 SYSCTL_INT(_vfs_nfsd, OID_AUTO, commit_blks, CTLFLAG_RW, &nfs_commit_blks,
     0, "");
 SYSCTL_INT(_vfs_nfsd, OID_AUTO, commit_miss, CTLFLAG_RW, &nfs_commit_miss,
     0, "");
 SYSCTL_INT(_vfs_nfsd, OID_AUTO, issue_delegations, CTLFLAG_RW,
     &nfsrv_issuedelegs, 0, "Enable nfsd to issue delegations");
 SYSCTL_INT(_vfs_nfsd, OID_AUTO, enable_locallocks, CTLFLAG_RW,
     &nfsrv_dolocallocks, 0, "Enable nfsd to acquire local locks on files");
 SYSCTL_INT(_vfs_nfsd, OID_AUTO, debuglevel, CTLFLAG_RW, &nfsd_debuglevel,
     0, "Debug level for NFS server");
 SYSCTL_INT(_vfs_nfsd, OID_AUTO, enable_stringtouid, CTLFLAG_RW,
     &nfsd_enable_stringtouid, 0, "Enable nfsd to accept numeric owner_names");
 
 #define	MAX_REORDERED_RPC	16
 #define	NUM_HEURISTIC		1031
 #define	NHUSE_INIT		64
 #define	NHUSE_INC		16
 #define	NHUSE_MAX		2048
 
 static struct nfsheur {
 	struct vnode *nh_vp;	/* vp to match (unreferenced pointer) */
 	off_t nh_nextoff;	/* next offset for sequential detection */
 	int nh_use;		/* use count for selection */
 	int nh_seqcount;	/* heuristic */
 } nfsheur[NUM_HEURISTIC];
 
 
 /*
  * Heuristic to detect sequential operation.
  */
 static struct nfsheur *
 nfsrv_sequential_heuristic(struct uio *uio, struct vnode *vp)
 {
 	struct nfsheur *nh;
 	int hi, try;
 
 	/* Locate best candidate. */
 	try = 32;
 	hi = ((int)(vm_offset_t)vp / sizeof(struct vnode)) % NUM_HEURISTIC;
 	nh = &nfsheur[hi];
 	while (try--) {
 		if (nfsheur[hi].nh_vp == vp) {
 			nh = &nfsheur[hi];
 			break;
 		}
 		if (nfsheur[hi].nh_use > 0)
 			--nfsheur[hi].nh_use;
 		hi = (hi + 1) % NUM_HEURISTIC;
 		if (nfsheur[hi].nh_use < nh->nh_use)
 			nh = &nfsheur[hi];
 	}
 
 	/* Initialize hint if this is a new file. */
 	if (nh->nh_vp != vp) {
 		nh->nh_vp = vp;
 		nh->nh_nextoff = uio->uio_offset;
 		nh->nh_use = NHUSE_INIT;
 		if (uio->uio_offset == 0)
 			nh->nh_seqcount = 4;
 		else
 			nh->nh_seqcount = 1;
 	}
 
 	/* Calculate heuristic. */
 	if ((uio->uio_offset == 0 && nh->nh_seqcount > 0) ||
 	    uio->uio_offset == nh->nh_nextoff) {
 		/* See comments in vfs_vnops.c:sequential_heuristic(). */
 		nh->nh_seqcount += howmany(uio->uio_resid, 16384);
 		if (nh->nh_seqcount > IO_SEQMAX)
 			nh->nh_seqcount = IO_SEQMAX;
 	} else if (qabs(uio->uio_offset - nh->nh_nextoff) <= MAX_REORDERED_RPC *
 	    imax(vp->v_mount->mnt_stat.f_iosize, uio->uio_resid)) {
 		/* Probably a reordered RPC, leave seqcount alone. */
 	} else if (nh->nh_seqcount > 1) {
 		nh->nh_seqcount /= 2;
 	} else {
 		nh->nh_seqcount = 0;
 	}
 	nh->nh_use += NHUSE_INC;
 	if (nh->nh_use > NHUSE_MAX)
 		nh->nh_use = NHUSE_MAX;
 	return (nh);
 }
 
 /*
  * Get attributes into nfsvattr structure.
  */
 int
 nfsvno_getattr(struct vnode *vp, struct nfsvattr *nvap, struct ucred *cred,
     struct thread *p, int vpislocked)
 {
 	int error, lockedit = 0;
 
 	if (vpislocked == 0) {
 		/*
 		 * When vpislocked == 0, the vnode is either exclusively
 		 * locked by this thread or not locked by this thread.
 		 * As such, shared lock it, if not exclusively locked.
 		 */
 		if (NFSVOPISLOCKED(vp) != LK_EXCLUSIVE) {
 			lockedit = 1;
 			NFSVOPLOCK(vp, LK_SHARED | LK_RETRY);
 		}
 	}
 	error = VOP_GETATTR(vp, &nvap->na_vattr, cred);
 	if (lockedit != 0)
 		NFSVOPUNLOCK(vp, 0);
 
 	NFSEXITCODE(error);
 	return (error);
 }
 
 /*
  * Get a file handle for a vnode.
  */
 int
 nfsvno_getfh(struct vnode *vp, fhandle_t *fhp, struct thread *p)
 {
 	int error;
 
 	NFSBZERO((caddr_t)fhp, sizeof(fhandle_t));
 	fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid;
 	error = VOP_VPTOFH(vp, &fhp->fh_fid);
 
 	NFSEXITCODE(error);
 	return (error);
 }
 
 /*
  * Perform access checking for vnodes obtained from file handles that would
  * refer to files already opened by a Unix client. You cannot just use
  * vn_writechk() and VOP_ACCESSX() for two reasons.
  * 1 - You must check for exported rdonly as well as MNT_RDONLY for the write
  *     case.
  * 2 - The owner is to be given access irrespective of mode bits for some
  *     operations, so that processes that chmod after opening a file don't
  *     break.
  */
 int
 nfsvno_accchk(struct vnode *vp, accmode_t accmode, struct ucred *cred,
     struct nfsexstuff *exp, struct thread *p, int override, int vpislocked,
     u_int32_t *supportedtypep)
 {
 	struct vattr vattr;
 	int error = 0, getret = 0;
 
 	if (vpislocked == 0) {
 		if (NFSVOPLOCK(vp, LK_SHARED) != 0) {
 			error = EPERM;
 			goto out;
 		}
 	}
 	if (accmode & VWRITE) {
 		/* Just vn_writechk() changed to check rdonly */
 		/*
 		 * Disallow write attempts on read-only file systems;
 		 * unless the file is a socket or a block or character
 		 * device resident on the file system.
 		 */
 		if (NFSVNO_EXRDONLY(exp) ||
 		    (vp->v_mount->mnt_flag & MNT_RDONLY)) {
 			switch (vp->v_type) {
 			case VREG:
 			case VDIR:
 			case VLNK:
 				error = EROFS;
 			default:
 				break;
 			}
 		}
 		/*
 		 * If there's shared text associated with
 		 * the inode, try to free it up once.  If
 		 * we fail, we can't allow writing.
 		 */
 		if (VOP_IS_TEXT(vp) && error == 0)
 			error = ETXTBSY;
 	}
 	if (error != 0) {
 		if (vpislocked == 0)
 			NFSVOPUNLOCK(vp, 0);
 		goto out;
 	}
 
 	/*
 	 * Should the override still be applied when ACLs are enabled?
 	 */
 	error = VOP_ACCESSX(vp, accmode, cred, p);
 	if (error != 0 && (accmode & (VDELETE | VDELETE_CHILD))) {
 		/*
 		 * Try again with VEXPLICIT_DENY, to see if the test for
 		 * deletion is supported.
 		 */
 		error = VOP_ACCESSX(vp, accmode | VEXPLICIT_DENY, cred, p);
 		if (error == 0) {
 			if (vp->v_type == VDIR) {
 				accmode &= ~(VDELETE | VDELETE_CHILD);
 				accmode |= VWRITE;
 				error = VOP_ACCESSX(vp, accmode, cred, p);
 			} else if (supportedtypep != NULL) {
 				*supportedtypep &= ~NFSACCESS_DELETE;
 			}
 		}
 	}
 
 	/*
 	 * Allow certain operations for the owner (reads and writes
 	 * on files that are already open).
 	 */
 	if (override != NFSACCCHK_NOOVERRIDE &&
 	    (error == EPERM || error == EACCES)) {
 		if (cred->cr_uid == 0 && (override & NFSACCCHK_ALLOWROOT))
 			error = 0;
 		else if (override & NFSACCCHK_ALLOWOWNER) {
 			getret = VOP_GETATTR(vp, &vattr, cred);
 			if (getret == 0 && cred->cr_uid == vattr.va_uid)
 				error = 0;
 		}
 	}
 	if (vpislocked == 0)
 		NFSVOPUNLOCK(vp, 0);
 
 out:
 	NFSEXITCODE(error);
 	return (error);
 }
 
 /*
  * Set attribute(s) vnop.
  */
 int
 nfsvno_setattr(struct vnode *vp, struct nfsvattr *nvap, struct ucred *cred,
     struct thread *p, struct nfsexstuff *exp)
 {
 	int error;
 
 	error = VOP_SETATTR(vp, &nvap->na_vattr, cred);
 	NFSEXITCODE(error);
 	return (error);
 }
 
 /*
  * Set up nameidata for a lookup() call and do it.
  */
 int
 nfsvno_namei(struct nfsrv_descript *nd, struct nameidata *ndp,
     struct vnode *dp, int islocked, struct nfsexstuff *exp, struct thread *p,
     struct vnode **retdirp)
 {
 	struct componentname *cnp = &ndp->ni_cnd;
 	int i;
 	struct iovec aiov;
 	struct uio auio;
 	int lockleaf = (cnp->cn_flags & LOCKLEAF) != 0, linklen;
 	int error = 0, crossmnt;
 	char *cp;
 
 	*retdirp = NULL;
 	cnp->cn_nameptr = cnp->cn_pnbuf;
 	ndp->ni_lcf = 0;
 	/*
 	 * Extract and set starting directory.
 	 */
 	if (dp->v_type != VDIR) {
 		if (islocked)
 			vput(dp);
 		else
 			vrele(dp);
 		nfsvno_relpathbuf(ndp);
 		error = ENOTDIR;
 		goto out1;
 	}
 	if (islocked)
 		NFSVOPUNLOCK(dp, 0);
 	VREF(dp);
 	*retdirp = dp;
 	if (NFSVNO_EXRDONLY(exp))
 		cnp->cn_flags |= RDONLY;
 	ndp->ni_segflg = UIO_SYSSPACE;
 	crossmnt = 1;
 
 	if (nd->nd_flag & ND_PUBLOOKUP) {
 		ndp->ni_loopcnt = 0;
 		if (cnp->cn_pnbuf[0] == '/') {
 			vrele(dp);
 			/*
 			 * Check for degenerate pathnames here, since lookup()
 			 * panics on them.
 			 */
 			for (i = 1; i < ndp->ni_pathlen; i++)
 				if (cnp->cn_pnbuf[i] != '/')
 					break;
 			if (i == ndp->ni_pathlen) {
 				error = NFSERR_ACCES;
 				goto out;
 			}
 			dp = rootvnode;
 			VREF(dp);
 		}
 	} else if ((nfsrv_enable_crossmntpt == 0 && NFSVNO_EXPORTED(exp)) ||
 	    (nd->nd_flag & ND_NFSV4) == 0) {
 		/*
 		 * Only cross mount points for NFSv4 when doing a
 		 * mount while traversing the file system above
 		 * the mount point, unless nfsrv_enable_crossmntpt is set.
 		 */
 		cnp->cn_flags |= NOCROSSMOUNT;
 		crossmnt = 0;
 	}
 
 	/*
 	 * Initialize for scan, set ni_startdir and bump ref on dp again
 	 * because lookup() will dereference ni_startdir.
 	 */
 
 	cnp->cn_thread = p;
 	ndp->ni_startdir = dp;
 	ndp->ni_rootdir = rootvnode;
 	ndp->ni_topdir = NULL;
 
 	if (!lockleaf)
 		cnp->cn_flags |= LOCKLEAF;
 	for (;;) {
 		cnp->cn_nameptr = cnp->cn_pnbuf;
 		/*
 		 * Call lookup() to do the real work.  If an error occurs,
 		 * ndp->ni_vp and ni_dvp are left uninitialized or NULL and
 		 * we do not have to dereference anything before returning.
 		 * In either case ni_startdir will be dereferenced and NULLed
 		 * out.
 		 */
 		error = lookup(ndp);
 		if (error)
 			break;
 
 		/*
 		 * Check for encountering a symbolic link.  Trivial
 		 * termination occurs if no symlink encountered.
 		 */
 		if ((cnp->cn_flags & ISSYMLINK) == 0) {
 			if ((cnp->cn_flags & (SAVENAME | SAVESTART)) == 0)
 				nfsvno_relpathbuf(ndp);
 			if (ndp->ni_vp && !lockleaf)
 				NFSVOPUNLOCK(ndp->ni_vp, 0);
 			break;
 		}
 
 		/*
 		 * Validate symlink
 		 */
 		if ((cnp->cn_flags & LOCKPARENT) && ndp->ni_pathlen == 1)
 			NFSVOPUNLOCK(ndp->ni_dvp, 0);
 		if (!(nd->nd_flag & ND_PUBLOOKUP)) {
 			error = EINVAL;
 			goto badlink2;
 		}
 
 		if (ndp->ni_loopcnt++ >= MAXSYMLINKS) {
 			error = ELOOP;
 			goto badlink2;
 		}
 		if (ndp->ni_pathlen > 1)
 			cp = uma_zalloc(namei_zone, M_WAITOK);
 		else
 			cp = cnp->cn_pnbuf;
 		aiov.iov_base = cp;
 		aiov.iov_len = MAXPATHLEN;
 		auio.uio_iov = &aiov;
 		auio.uio_iovcnt = 1;
 		auio.uio_offset = 0;
 		auio.uio_rw = UIO_READ;
 		auio.uio_segflg = UIO_SYSSPACE;
 		auio.uio_td = NULL;
 		auio.uio_resid = MAXPATHLEN;
 		error = VOP_READLINK(ndp->ni_vp, &auio, cnp->cn_cred);
 		if (error) {
 		badlink1:
 			if (ndp->ni_pathlen > 1)
 				uma_zfree(namei_zone, cp);
 		badlink2:
 			vrele(ndp->ni_dvp);
 			vput(ndp->ni_vp);
 			break;
 		}
 		linklen = MAXPATHLEN - auio.uio_resid;
 		if (linklen == 0) {
 			error = ENOENT;
 			goto badlink1;
 		}
 		if (linklen + ndp->ni_pathlen >= MAXPATHLEN) {
 			error = ENAMETOOLONG;
 			goto badlink1;
 		}
 
 		/*
 		 * Adjust or replace path
 		 */
 		if (ndp->ni_pathlen > 1) {
 			NFSBCOPY(ndp->ni_next, cp + linklen, ndp->ni_pathlen);
 			uma_zfree(namei_zone, cnp->cn_pnbuf);
 			cnp->cn_pnbuf = cp;
 		} else
 			cnp->cn_pnbuf[linklen] = '\0';
 		ndp->ni_pathlen += linklen;
 
 		/*
 		 * Cleanup refs for next loop and check if root directory
 		 * should replace current directory.  Normally ni_dvp
 		 * becomes the new base directory and is cleaned up when
 		 * we loop.  Explicitly null pointers after invalidation
 		 * to clarify operation.
 		 */
 		vput(ndp->ni_vp);
 		ndp->ni_vp = NULL;
 
 		if (cnp->cn_pnbuf[0] == '/') {
 			vrele(ndp->ni_dvp);
 			ndp->ni_dvp = ndp->ni_rootdir;
 			VREF(ndp->ni_dvp);
 		}
 		ndp->ni_startdir = ndp->ni_dvp;
 		ndp->ni_dvp = NULL;
 	}
 	if (!lockleaf)
 		cnp->cn_flags &= ~LOCKLEAF;
 
 out:
 	if (error) {
 		nfsvno_relpathbuf(ndp);
 		ndp->ni_vp = NULL;
 		ndp->ni_dvp = NULL;
 		ndp->ni_startdir = NULL;
 	} else if ((ndp->ni_cnd.cn_flags & (WANTPARENT|LOCKPARENT)) == 0) {
 		ndp->ni_dvp = NULL;
 	}
 
 out1:
 	NFSEXITCODE2(error, nd);
 	return (error);
 }
 
 /*
  * Set up a pathname buffer and return a pointer to it and, optionally
  * set a hash pointer.
  */
 void
 nfsvno_setpathbuf(struct nameidata *ndp, char **bufpp, u_long **hashpp)
 {
 	struct componentname *cnp = &ndp->ni_cnd;
 
 	cnp->cn_flags |= (NOMACCHECK | HASBUF);
 	cnp->cn_pnbuf = uma_zalloc(namei_zone, M_WAITOK);
 	if (hashpp != NULL)
 		*hashpp = NULL;
 	*bufpp = cnp->cn_pnbuf;
 }
 
 /*
  * Release the above path buffer, if not released by nfsvno_namei().
  */
 void
 nfsvno_relpathbuf(struct nameidata *ndp)
 {
 
 	if ((ndp->ni_cnd.cn_flags & HASBUF) == 0)
 		panic("nfsrelpath");
 	uma_zfree(namei_zone, ndp->ni_cnd.cn_pnbuf);
 	ndp->ni_cnd.cn_flags &= ~HASBUF;
 }
 
 /*
  * Readlink vnode op into an mbuf list.
  */
 int
 nfsvno_readlink(struct vnode *vp, struct ucred *cred, struct thread *p,
     struct mbuf **mpp, struct mbuf **mpendp, int *lenp)
 {
 	struct iovec iv[(NFS_MAXPATHLEN+MLEN-1)/MLEN];
 	struct iovec *ivp = iv;
 	struct uio io, *uiop = &io;
 	struct mbuf *mp, *mp2 = NULL, *mp3 = NULL;
 	int i, len, tlen, error = 0;
 
 	len = 0;
 	i = 0;
 	while (len < NFS_MAXPATHLEN) {
 		NFSMGET(mp);
 		MCLGET(mp, M_WAITOK);
 		mp->m_len = M_SIZE(mp);
 		if (len == 0) {
 			mp3 = mp2 = mp;
 		} else {
 			mp2->m_next = mp;
 			mp2 = mp;
 		}
 		if ((len + mp->m_len) > NFS_MAXPATHLEN) {
 			mp->m_len = NFS_MAXPATHLEN - len;
 			len = NFS_MAXPATHLEN;
 		} else {
 			len += mp->m_len;
 		}
 		ivp->iov_base = mtod(mp, caddr_t);
 		ivp->iov_len = mp->m_len;
 		i++;
 		ivp++;
 	}
 	uiop->uio_iov = iv;
 	uiop->uio_iovcnt = i;
 	uiop->uio_offset = 0;
 	uiop->uio_resid = len;
 	uiop->uio_rw = UIO_READ;
 	uiop->uio_segflg = UIO_SYSSPACE;
 	uiop->uio_td = NULL;
 	error = VOP_READLINK(vp, uiop, cred);
 	if (error) {
 		m_freem(mp3);
 		*lenp = 0;
 		goto out;
 	}
 	if (uiop->uio_resid > 0) {
 		len -= uiop->uio_resid;
 		tlen = NFSM_RNDUP(len);
 		nfsrv_adj(mp3, NFS_MAXPATHLEN - tlen, tlen - len);
 	}
 	*lenp = len;
 	*mpp = mp3;
 	*mpendp = mp;
 
 out:
 	NFSEXITCODE(error);
 	return (error);
 }
 
 /*
  * Read vnode op call into mbuf list.
  */
 int
 nfsvno_read(struct vnode *vp, off_t off, int cnt, struct ucred *cred,
     struct thread *p, struct mbuf **mpp, struct mbuf **mpendp)
 {
 	struct mbuf *m;
 	int i;
 	struct iovec *iv;
 	struct iovec *iv2;
 	int error = 0, len, left, siz, tlen, ioflag = 0;
 	struct mbuf *m2 = NULL, *m3;
 	struct uio io, *uiop = &io;
 	struct nfsheur *nh;
 
 	len = left = NFSM_RNDUP(cnt);
 	m3 = NULL;
 	/*
 	 * Generate the mbuf list with the uio_iov ref. to it.
 	 */
 	i = 0;
 	while (left > 0) {
 		NFSMGET(m);
 		MCLGET(m, M_WAITOK);
 		m->m_len = 0;
 		siz = min(M_TRAILINGSPACE(m), left);
 		left -= siz;
 		i++;
 		if (m3)
 			m2->m_next = m;
 		else
 			m3 = m;
 		m2 = m;
 	}
 	MALLOC(iv, struct iovec *, i * sizeof (struct iovec),
 	    M_TEMP, M_WAITOK);
 	uiop->uio_iov = iv2 = iv;
 	m = m3;
 	left = len;
 	i = 0;
 	while (left > 0) {
 		if (m == NULL)
 			panic("nfsvno_read iov");
 		siz = min(M_TRAILINGSPACE(m), left);
 		if (siz > 0) {
 			iv->iov_base = mtod(m, caddr_t) + m->m_len;
 			iv->iov_len = siz;
 			m->m_len += siz;
 			left -= siz;
 			iv++;
 			i++;
 		}
 		m = m->m_next;
 	}
 	uiop->uio_iovcnt = i;
 	uiop->uio_offset = off;
 	uiop->uio_resid = len;
 	uiop->uio_rw = UIO_READ;
 	uiop->uio_segflg = UIO_SYSSPACE;
 	uiop->uio_td = NULL;
 	nh = nfsrv_sequential_heuristic(uiop, vp);
 	ioflag |= nh->nh_seqcount << IO_SEQSHIFT;
 	/* XXX KDM make this more systematic? */
 	nfsstatsv1.srvbytes[NFSV4OP_READ] += uiop->uio_resid;
 	error = VOP_READ(vp, uiop, IO_NODELOCKED | ioflag, cred);
 	FREE((caddr_t)iv2, M_TEMP);
 	if (error) {
 		m_freem(m3);
 		*mpp = NULL;
 		goto out;
 	}
 	nh->nh_nextoff = uiop->uio_offset;
 	tlen = len - uiop->uio_resid;
 	cnt = cnt < tlen ? cnt : tlen;
 	tlen = NFSM_RNDUP(cnt);
 	if (tlen == 0) {
 		m_freem(m3);
 		m3 = NULL;
 	} else if (len != tlen || tlen != cnt)
 		nfsrv_adj(m3, len - tlen, tlen - cnt);
 	*mpp = m3;
 	*mpendp = m2;
 
 out:
 	NFSEXITCODE(error);
 	return (error);
 }
 
 /*
  * Write vnode op from an mbuf list.
  */
 int
 nfsvno_write(struct vnode *vp, off_t off, int retlen, int cnt, int stable,
     struct mbuf *mp, char *cp, struct ucred *cred, struct thread *p)
 {
 	struct iovec *ivp;
 	int i, len;
 	struct iovec *iv;
 	int ioflags, error;
 	struct uio io, *uiop = &io;
 	struct nfsheur *nh;
 
 	MALLOC(ivp, struct iovec *, cnt * sizeof (struct iovec), M_TEMP,
 	    M_WAITOK);
 	uiop->uio_iov = iv = ivp;
 	uiop->uio_iovcnt = cnt;
 	i = mtod(mp, caddr_t) + mp->m_len - cp;
 	len = retlen;
 	while (len > 0) {
 		if (mp == NULL)
 			panic("nfsvno_write");
 		if (i > 0) {
 			i = min(i, len);
 			ivp->iov_base = cp;
 			ivp->iov_len = i;
 			ivp++;
 			len -= i;
 		}
 		mp = mp->m_next;
 		if (mp) {
 			i = mp->m_len;
 			cp = mtod(mp, caddr_t);
 		}
 	}
 
 	if (stable == NFSWRITE_UNSTABLE)
 		ioflags = IO_NODELOCKED;
 	else
 		ioflags = (IO_SYNC | IO_NODELOCKED);
 	uiop->uio_resid = retlen;
 	uiop->uio_rw = UIO_WRITE;
 	uiop->uio_segflg = UIO_SYSSPACE;
 	NFSUIOPROC(uiop, p);
 	uiop->uio_offset = off;
 	nh = nfsrv_sequential_heuristic(uiop, vp);
 	ioflags |= nh->nh_seqcount << IO_SEQSHIFT;
 	/* XXX KDM make this more systematic? */
 	nfsstatsv1.srvbytes[NFSV4OP_WRITE] += uiop->uio_resid;
 	error = VOP_WRITE(vp, uiop, ioflags, cred);
 	if (error == 0)
 		nh->nh_nextoff = uiop->uio_offset;
 	FREE((caddr_t)iv, M_TEMP);
 
 	NFSEXITCODE(error);
 	return (error);
 }
 
 /*
  * Common code for creating a regular file (plus special files for V2).
  */
 int
 nfsvno_createsub(struct nfsrv_descript *nd, struct nameidata *ndp,
     struct vnode **vpp, struct nfsvattr *nvap, int *exclusive_flagp,
     int32_t *cverf, NFSDEV_T rdev, struct thread *p, struct nfsexstuff *exp)
 {
 	u_quad_t tempsize;
 	int error;
 
 	error = nd->nd_repstat;
 	if (!error && ndp->ni_vp == NULL) {
 		if (nvap->na_type == VREG || nvap->na_type == VSOCK) {
 			vrele(ndp->ni_startdir);
 			error = VOP_CREATE(ndp->ni_dvp,
 			    &ndp->ni_vp, &ndp->ni_cnd, &nvap->na_vattr);
 			vput(ndp->ni_dvp);
 			nfsvno_relpathbuf(ndp);
 			if (!error) {
 				if (*exclusive_flagp) {
 					*exclusive_flagp = 0;
 					NFSVNO_ATTRINIT(nvap);
 					nvap->na_atime.tv_sec = cverf[0];
 					nvap->na_atime.tv_nsec = cverf[1];
 					error = VOP_SETATTR(ndp->ni_vp,
 					    &nvap->na_vattr, nd->nd_cred);
 					if (error != 0) {
 						vput(ndp->ni_vp);
 						ndp->ni_vp = NULL;
 						error = NFSERR_NOTSUPP;
 					}
 				}
 			}
 		/*
 		 * NFS V2 Only. nfsrvd_mknod() does this for V3.
 		 * (This implies, just get out on an error.)
 		 */
 		} else if (nvap->na_type == VCHR || nvap->na_type == VBLK ||
 			nvap->na_type == VFIFO) {
 			if (nvap->na_type == VCHR && rdev == 0xffffffff)
 				nvap->na_type = VFIFO;
                         if (nvap->na_type != VFIFO &&
 			    (error = priv_check_cred(nd->nd_cred,
 			     PRIV_VFS_MKNOD_DEV, 0))) {
 				vrele(ndp->ni_startdir);
 				nfsvno_relpathbuf(ndp);
 				vput(ndp->ni_dvp);
 				goto out;
 			}
 			nvap->na_rdev = rdev;
 			error = VOP_MKNOD(ndp->ni_dvp, &ndp->ni_vp,
 			    &ndp->ni_cnd, &nvap->na_vattr);
 			vput(ndp->ni_dvp);
 			nfsvno_relpathbuf(ndp);
 			vrele(ndp->ni_startdir);
 			if (error)
 				goto out;
 		} else {
 			vrele(ndp->ni_startdir);
 			nfsvno_relpathbuf(ndp);
 			vput(ndp->ni_dvp);
 			error = ENXIO;
 			goto out;
 		}
 		*vpp = ndp->ni_vp;
 	} else {
 		/*
 		 * Handle cases where error is already set and/or
 		 * the file exists.
 		 * 1 - clean up the lookup
 		 * 2 - iff !error and na_size set, truncate it
 		 */
 		vrele(ndp->ni_startdir);
 		nfsvno_relpathbuf(ndp);
 		*vpp = ndp->ni_vp;
 		if (ndp->ni_dvp == *vpp)
 			vrele(ndp->ni_dvp);
 		else
 			vput(ndp->ni_dvp);
 		if (!error && nvap->na_size != VNOVAL) {
 			error = nfsvno_accchk(*vpp, VWRITE,
 			    nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
 			    NFSACCCHK_VPISLOCKED, NULL);
 			if (!error) {
 				tempsize = nvap->na_size;
 				NFSVNO_ATTRINIT(nvap);
 				nvap->na_size = tempsize;
 				error = VOP_SETATTR(*vpp,
 				    &nvap->na_vattr, nd->nd_cred);
 			}
 		}
 		if (error)
 			vput(*vpp);
 	}
 
 out:
 	NFSEXITCODE(error);
 	return (error);
 }
 
 /*
  * Do a mknod vnode op.
  */
 int
 nfsvno_mknod(struct nameidata *ndp, struct nfsvattr *nvap, struct ucred *cred,
     struct thread *p)
 {
 	int error = 0;
 	enum vtype vtyp;
 
 	vtyp = nvap->na_type;
 	/*
 	 * Iff doesn't exist, create it.
 	 */
 	if (ndp->ni_vp) {
 		vrele(ndp->ni_startdir);
 		nfsvno_relpathbuf(ndp);
 		vput(ndp->ni_dvp);
 		vrele(ndp->ni_vp);
 		error = EEXIST;
 		goto out;
 	}
 	if (vtyp != VCHR && vtyp != VBLK && vtyp != VSOCK && vtyp != VFIFO) {
 		vrele(ndp->ni_startdir);
 		nfsvno_relpathbuf(ndp);
 		vput(ndp->ni_dvp);
 		error = NFSERR_BADTYPE;
 		goto out;
 	}
 	if (vtyp == VSOCK) {
 		vrele(ndp->ni_startdir);
 		error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp,
 		    &ndp->ni_cnd, &nvap->na_vattr);
 		vput(ndp->ni_dvp);
 		nfsvno_relpathbuf(ndp);
 	} else {
 		if (nvap->na_type != VFIFO &&
 		    (error = priv_check_cred(cred, PRIV_VFS_MKNOD_DEV, 0))) {
 			vrele(ndp->ni_startdir);
 			nfsvno_relpathbuf(ndp);
 			vput(ndp->ni_dvp);
 			goto out;
 		}
 		error = VOP_MKNOD(ndp->ni_dvp, &ndp->ni_vp,
 		    &ndp->ni_cnd, &nvap->na_vattr);
 		vput(ndp->ni_dvp);
 		nfsvno_relpathbuf(ndp);
 		vrele(ndp->ni_startdir);
 		/*
 		 * Since VOP_MKNOD returns the ni_vp, I can't
 		 * see any reason to do the lookup.
 		 */
 	}
 
 out:
 	NFSEXITCODE(error);
 	return (error);
 }
 
 /*
  * Mkdir vnode op.
  */
 int
 nfsvno_mkdir(struct nameidata *ndp, struct nfsvattr *nvap, uid_t saved_uid,
     struct ucred *cred, struct thread *p, struct nfsexstuff *exp)
 {
 	int error = 0;
 
 	if (ndp->ni_vp != NULL) {
 		if (ndp->ni_dvp == ndp->ni_vp)
 			vrele(ndp->ni_dvp);
 		else
 			vput(ndp->ni_dvp);
 		vrele(ndp->ni_vp);
 		nfsvno_relpathbuf(ndp);
 		error = EEXIST;
 		goto out;
 	}
 	error = VOP_MKDIR(ndp->ni_dvp, &ndp->ni_vp, &ndp->ni_cnd,
 	    &nvap->na_vattr);
 	vput(ndp->ni_dvp);
 	nfsvno_relpathbuf(ndp);
 
 out:
 	NFSEXITCODE(error);
 	return (error);
 }
 
 /*
  * symlink vnode op.
  */
 int
 nfsvno_symlink(struct nameidata *ndp, struct nfsvattr *nvap, char *pathcp,
     int pathlen, int not_v2, uid_t saved_uid, struct ucred *cred, struct thread *p,
     struct nfsexstuff *exp)
 {
 	int error = 0;
 
 	if (ndp->ni_vp) {
 		vrele(ndp->ni_startdir);
 		nfsvno_relpathbuf(ndp);
 		if (ndp->ni_dvp == ndp->ni_vp)
 			vrele(ndp->ni_dvp);
 		else
 			vput(ndp->ni_dvp);
 		vrele(ndp->ni_vp);
 		error = EEXIST;
 		goto out;
 	}
 
 	error = VOP_SYMLINK(ndp->ni_dvp, &ndp->ni_vp, &ndp->ni_cnd,
 	    &nvap->na_vattr, pathcp);
 	vput(ndp->ni_dvp);
 	vrele(ndp->ni_startdir);
 	nfsvno_relpathbuf(ndp);
 	/*
 	 * Although FreeBSD still had the lookup code in
 	 * it for 7/current, there doesn't seem to be any
 	 * point, since VOP_SYMLINK() returns the ni_vp.
 	 * Just vput it for v2.
 	 */
 	if (!not_v2 && !error)
 		vput(ndp->ni_vp);
 
 out:
 	NFSEXITCODE(error);
 	return (error);
 }
 
 /*
  * Parse symbolic link arguments.
  * This function has an ugly side effect. It will MALLOC() an area for
  * the symlink and set iov_base to point to it, only if it succeeds.
  * So, if it returns with uiop->uio_iov->iov_base != NULL, that must
  * be FREE'd later.
  */
 int
 nfsvno_getsymlink(struct nfsrv_descript *nd, struct nfsvattr *nvap,
     struct thread *p, char **pathcpp, int *lenp)
 {
 	u_int32_t *tl;
 	char *pathcp = NULL;
 	int error = 0, len;
 	struct nfsv2_sattr *sp;
 
 	*pathcpp = NULL;
 	*lenp = 0;
 	if ((nd->nd_flag & ND_NFSV3) &&
 	    (error = nfsrv_sattr(nd, NULL, nvap, NULL, NULL, p)))
 		goto nfsmout;
 	NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 	len = fxdr_unsigned(int, *tl);
 	if (len > NFS_MAXPATHLEN || len <= 0) {
 		error = EBADRPC;
 		goto nfsmout;
 	}
 	MALLOC(pathcp, caddr_t, len + 1, M_TEMP, M_WAITOK);
 	error = nfsrv_mtostr(nd, pathcp, len);
 	if (error)
 		goto nfsmout;
 	if (nd->nd_flag & ND_NFSV2) {
 		NFSM_DISSECT(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
 		nvap->na_mode = fxdr_unsigned(u_int16_t, sp->sa_mode);
 	}
 	*pathcpp = pathcp;
 	*lenp = len;
 	NFSEXITCODE2(0, nd);
 	return (0);
 nfsmout:
 	if (pathcp)
 		free(pathcp, M_TEMP);
 	NFSEXITCODE2(error, nd);
 	return (error);
 }
 
 /*
  * Remove a non-directory object.
  */
 int
 nfsvno_removesub(struct nameidata *ndp, int is_v4, struct ucred *cred,
     struct thread *p, struct nfsexstuff *exp)
 {
 	struct vnode *vp;
 	int error = 0;
 
 	vp = ndp->ni_vp;
 	if (vp->v_type == VDIR)
 		error = NFSERR_ISDIR;
 	else if (is_v4)
 		error = nfsrv_checkremove(vp, 1, p);
 	if (!error)
 		error = VOP_REMOVE(ndp->ni_dvp, vp, &ndp->ni_cnd);
 	if (ndp->ni_dvp == vp)
 		vrele(ndp->ni_dvp);
 	else
 		vput(ndp->ni_dvp);
 	vput(vp);
 	if ((ndp->ni_cnd.cn_flags & SAVENAME) != 0)
 		nfsvno_relpathbuf(ndp);
 	NFSEXITCODE(error);
 	return (error);
 }
 
 /*
  * Remove a directory.
  */
 int
 nfsvno_rmdirsub(struct nameidata *ndp, int is_v4, struct ucred *cred,
     struct thread *p, struct nfsexstuff *exp)
 {
 	struct vnode *vp;
 	int error = 0;
 
 	vp = ndp->ni_vp;
 	if (vp->v_type != VDIR) {
 		error = ENOTDIR;
 		goto out;
 	}
 	/*
 	 * No rmdir "." please.
 	 */
 	if (ndp->ni_dvp == vp) {
 		error = EINVAL;
 		goto out;
 	}
 	/*
 	 * The root of a mounted filesystem cannot be deleted.
 	 */
 	if (vp->v_vflag & VV_ROOT)
 		error = EBUSY;
 out:
 	if (!error)
 		error = VOP_RMDIR(ndp->ni_dvp, vp, &ndp->ni_cnd);
 	if (ndp->ni_dvp == vp)
 		vrele(ndp->ni_dvp);
 	else
 		vput(ndp->ni_dvp);
 	vput(vp);
 	if ((ndp->ni_cnd.cn_flags & SAVENAME) != 0)
 		nfsvno_relpathbuf(ndp);
 	NFSEXITCODE(error);
 	return (error);
 }
 
 /*
  * Rename vnode op.
  */
 int
 nfsvno_rename(struct nameidata *fromndp, struct nameidata *tondp,
     u_int32_t ndstat, u_int32_t ndflag, struct ucred *cred, struct thread *p)
 {
 	struct vnode *fvp, *tvp, *tdvp;
 	int error = 0;
 
 	fvp = fromndp->ni_vp;
 	if (ndstat) {
 		vrele(fromndp->ni_dvp);
 		vrele(fvp);
 		error = ndstat;
 		goto out1;
 	}
 	tdvp = tondp->ni_dvp;
 	tvp = tondp->ni_vp;
 	if (tvp != NULL) {
 		if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
 			error = (ndflag & ND_NFSV2) ? EISDIR : EEXIST;
 			goto out;
 		} else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
 			error = (ndflag & ND_NFSV2) ? ENOTDIR : EEXIST;
 			goto out;
 		}
 		if (tvp->v_type == VDIR && tvp->v_mountedhere) {
 			error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
 			goto out;
 		}
 
 		/*
 		 * A rename to '.' or '..' results in a prematurely
 		 * unlocked vnode on FreeBSD5, so I'm just going to fail that
 		 * here.
 		 */
 		if ((tondp->ni_cnd.cn_namelen == 1 &&
 		     tondp->ni_cnd.cn_nameptr[0] == '.') ||
 		    (tondp->ni_cnd.cn_namelen == 2 &&
 		     tondp->ni_cnd.cn_nameptr[0] == '.' &&
 		     tondp->ni_cnd.cn_nameptr[1] == '.')) {
 			error = EINVAL;
 			goto out;
 		}
 	}
 	if (fvp->v_type == VDIR && fvp->v_mountedhere) {
 		error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
 		goto out;
 	}
 	if (fvp->v_mount != tdvp->v_mount) {
 		error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
 		goto out;
 	}
 	if (fvp == tdvp) {
 		error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EINVAL;
 		goto out;
 	}
 	if (fvp == tvp) {
 		/*
 		 * If source and destination are the same, there is nothing to
 		 * do. Set error to -1 to indicate this.
 		 */
 		error = -1;
 		goto out;
 	}
 	if (ndflag & ND_NFSV4) {
 		if (NFSVOPLOCK(fvp, LK_EXCLUSIVE) == 0) {
 			error = nfsrv_checkremove(fvp, 0, p);
 			NFSVOPUNLOCK(fvp, 0);
 		} else
 			error = EPERM;
 		if (tvp && !error)
 			error = nfsrv_checkremove(tvp, 1, p);
 	} else {
 		/*
 		 * For NFSv2 and NFSv3, try to get rid of the delegation, so
 		 * that the NFSv4 client won't be confused by the rename.
 		 * Since nfsd_recalldelegation() can only be called on an
 		 * unlocked vnode at this point and fvp is the file that will
 		 * still exist after the rename, just do fvp.
 		 */
 		nfsd_recalldelegation(fvp, p);
 	}
 out:
 	if (!error) {
 		error = VOP_RENAME(fromndp->ni_dvp, fromndp->ni_vp,
 		    &fromndp->ni_cnd, tondp->ni_dvp, tondp->ni_vp,
 		    &tondp->ni_cnd);
 	} else {
 		if (tdvp == tvp)
 			vrele(tdvp);
 		else
 			vput(tdvp);
 		if (tvp)
 			vput(tvp);
 		vrele(fromndp->ni_dvp);
 		vrele(fvp);
 		if (error == -1)
 			error = 0;
 	}
 	vrele(tondp->ni_startdir);
 	nfsvno_relpathbuf(tondp);
 out1:
 	vrele(fromndp->ni_startdir);
 	nfsvno_relpathbuf(fromndp);
 	NFSEXITCODE(error);
 	return (error);
 }
 
 /*
  * Link vnode op.
  */
 int
 nfsvno_link(struct nameidata *ndp, struct vnode *vp, struct ucred *cred,
     struct thread *p, struct nfsexstuff *exp)
 {
 	struct vnode *xp;
 	int error = 0;
 
 	xp = ndp->ni_vp;
 	if (xp != NULL) {
 		error = EEXIST;
 	} else {
 		xp = ndp->ni_dvp;
 		if (vp->v_mount != xp->v_mount)
 			error = EXDEV;
 	}
 	if (!error) {
 		NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
 		if ((vp->v_iflag & VI_DOOMED) == 0)
 			error = VOP_LINK(ndp->ni_dvp, vp, &ndp->ni_cnd);
 		else
 			error = EPERM;
 		if (ndp->ni_dvp == vp)
 			vrele(ndp->ni_dvp);
 		else
 			vput(ndp->ni_dvp);
 		NFSVOPUNLOCK(vp, 0);
 	} else {
 		if (ndp->ni_dvp == ndp->ni_vp)
 			vrele(ndp->ni_dvp);
 		else
 			vput(ndp->ni_dvp);
 		if (ndp->ni_vp)
 			vrele(ndp->ni_vp);
 	}
 	nfsvno_relpathbuf(ndp);
 	NFSEXITCODE(error);
 	return (error);
 }
 
 /*
  * Do the fsync() appropriate for the commit.
  */
 int
 nfsvno_fsync(struct vnode *vp, u_int64_t off, int cnt, struct ucred *cred,
     struct thread *td)
 {
 	int error = 0;
 
 	/*
 	 * RFC 1813 3.3.21: if count is 0, a flush from offset to the end of
 	 * file is done.  At this time VOP_FSYNC does not accept offset and
 	 * byte count parameters so call VOP_FSYNC the whole file for now.
 	 * The same is true for NFSv4: RFC 3530 Sec. 14.2.3.
 	 * File systems that do not use the buffer cache (as indicated
 	 * by MNTK_USES_BCACHE not being set) must use VOP_FSYNC().
 	 */
 	if (cnt == 0 || cnt > MAX_COMMIT_COUNT ||
 	    (vp->v_mount->mnt_kern_flag & MNTK_USES_BCACHE) == 0) {
 		/*
 		 * Give up and do the whole thing
 		 */
 		if (vp->v_object &&
 		   (vp->v_object->flags & OBJ_MIGHTBEDIRTY)) {
 			VM_OBJECT_WLOCK(vp->v_object);
 			vm_object_page_clean(vp->v_object, 0, 0, OBJPC_SYNC);
 			VM_OBJECT_WUNLOCK(vp->v_object);
 		}
 		error = VOP_FSYNC(vp, MNT_WAIT, td);
 	} else {
 		/*
 		 * Locate and synchronously write any buffers that fall
 		 * into the requested range.  Note:  we are assuming that
 		 * f_iosize is a power of 2.
 		 */
 		int iosize = vp->v_mount->mnt_stat.f_iosize;
 		int iomask = iosize - 1;
 		struct bufobj *bo;
 		daddr_t lblkno;
 
 		/*
 		 * Align to iosize boundary, super-align to page boundary.
 		 */
 		if (off & iomask) {
 			cnt += off & iomask;
 			off &= ~(u_quad_t)iomask;
 		}
 		if (off & PAGE_MASK) {
 			cnt += off & PAGE_MASK;
 			off &= ~(u_quad_t)PAGE_MASK;
 		}
 		lblkno = off / iosize;
 
 		if (vp->v_object &&
 		   (vp->v_object->flags & OBJ_MIGHTBEDIRTY)) {
 			VM_OBJECT_WLOCK(vp->v_object);
 			vm_object_page_clean(vp->v_object, off, off + cnt,
 			    OBJPC_SYNC);
 			VM_OBJECT_WUNLOCK(vp->v_object);
 		}
 
 		bo = &vp->v_bufobj;
 		BO_LOCK(bo);
 		while (cnt > 0) {
 			struct buf *bp;
 
 			/*
 			 * If we have a buffer and it is marked B_DELWRI we
 			 * have to lock and write it.  Otherwise the prior
 			 * write is assumed to have already been committed.
 			 *
 			 * gbincore() can return invalid buffers now so we
 			 * have to check that bit as well (though B_DELWRI
 			 * should not be set if B_INVAL is set there could be
 			 * a race here since we haven't locked the buffer).
 			 */
 			if ((bp = gbincore(&vp->v_bufobj, lblkno)) != NULL) {
 				if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_SLEEPFAIL |
 				    LK_INTERLOCK, BO_LOCKPTR(bo)) == ENOLCK) {
 					BO_LOCK(bo);
 					continue; /* retry */
 				}
 			    	if ((bp->b_flags & (B_DELWRI|B_INVAL)) ==
 				    B_DELWRI) {
 					bremfree(bp);
 					bp->b_flags &= ~B_ASYNC;
 					bwrite(bp);
 					++nfs_commit_miss;
 				} else
 					BUF_UNLOCK(bp);
 				BO_LOCK(bo);
 			}
 			++nfs_commit_blks;
 			if (cnt < iosize)
 				break;
 			cnt -= iosize;
 			++lblkno;
 		}
 		BO_UNLOCK(bo);
 	}
 	NFSEXITCODE(error);
 	return (error);
 }
 
 /*
  * Statfs vnode op.
  */
 int
 nfsvno_statfs(struct vnode *vp, struct statfs *sf)
 {
 	int error;
 
 	error = VFS_STATFS(vp->v_mount, sf);
 	if (error == 0) {
 		/*
 		 * Since NFS handles these values as unsigned on the
 		 * wire, there is no way to represent negative values,
 		 * so set them to 0. Without this, they will appear
 		 * to be very large positive values for clients like
 		 * Solaris10.
 		 */
 		if (sf->f_bavail < 0)
 			sf->f_bavail = 0;
 		if (sf->f_ffree < 0)
 			sf->f_ffree = 0;
 	}
 	NFSEXITCODE(error);
 	return (error);
 }
 
 /*
  * Do the vnode op stuff for Open. Similar to nfsvno_createsub(), but
  * must handle nfsrv_opencheck() calls after any other access checks.
  */
 void
 nfsvno_open(struct nfsrv_descript *nd, struct nameidata *ndp,
     nfsquad_t clientid, nfsv4stateid_t *stateidp, struct nfsstate *stp,
     int *exclusive_flagp, struct nfsvattr *nvap, int32_t *cverf, int create,
     NFSACL_T *aclp, nfsattrbit_t *attrbitp, struct ucred *cred, struct thread *p,
     struct nfsexstuff *exp, struct vnode **vpp)
 {
 	struct vnode *vp = NULL;
 	u_quad_t tempsize;
 	struct nfsexstuff nes;
 
 	if (ndp->ni_vp == NULL)
 		nd->nd_repstat = nfsrv_opencheck(clientid,
 		    stateidp, stp, NULL, nd, p, nd->nd_repstat);
 	if (!nd->nd_repstat) {
 		if (ndp->ni_vp == NULL) {
 			vrele(ndp->ni_startdir);
 			nd->nd_repstat = VOP_CREATE(ndp->ni_dvp,
 			    &ndp->ni_vp, &ndp->ni_cnd, &nvap->na_vattr);
 			vput(ndp->ni_dvp);
 			nfsvno_relpathbuf(ndp);
 			if (!nd->nd_repstat) {
 				if (*exclusive_flagp) {
 					*exclusive_flagp = 0;
 					NFSVNO_ATTRINIT(nvap);
 					nvap->na_atime.tv_sec = cverf[0];
 					nvap->na_atime.tv_nsec = cverf[1];
 					nd->nd_repstat = VOP_SETATTR(ndp->ni_vp,
 					    &nvap->na_vattr, cred);
 					if (nd->nd_repstat != 0) {
 						vput(ndp->ni_vp);
 						ndp->ni_vp = NULL;
 						nd->nd_repstat = NFSERR_NOTSUPP;
 					}
 				} else {
 					nfsrv_fixattr(nd, ndp->ni_vp, nvap,
 					    aclp, p, attrbitp, exp);
 				}
 			}
 			vp = ndp->ni_vp;
 		} else {
 			if (ndp->ni_startdir)
 				vrele(ndp->ni_startdir);
 			nfsvno_relpathbuf(ndp);
 			vp = ndp->ni_vp;
 			if (create == NFSV4OPEN_CREATE) {
 				if (ndp->ni_dvp == vp)
 					vrele(ndp->ni_dvp);
 				else
 					vput(ndp->ni_dvp);
 			}
 			if (NFSVNO_ISSETSIZE(nvap) && vp->v_type == VREG) {
 				if (ndp->ni_cnd.cn_flags & RDONLY)
 					NFSVNO_SETEXRDONLY(&nes);
 				else
 					NFSVNO_EXINIT(&nes);
 				nd->nd_repstat = nfsvno_accchk(vp, 
 				    VWRITE, cred, &nes, p,
 				    NFSACCCHK_NOOVERRIDE,
 				    NFSACCCHK_VPISLOCKED, NULL);
 				nd->nd_repstat = nfsrv_opencheck(clientid,
 				    stateidp, stp, vp, nd, p, nd->nd_repstat);
 				if (!nd->nd_repstat) {
 					tempsize = nvap->na_size;
 					NFSVNO_ATTRINIT(nvap);
 					nvap->na_size = tempsize;
 					nd->nd_repstat = VOP_SETATTR(vp,
 					    &nvap->na_vattr, cred);
 				}
 			} else if (vp->v_type == VREG) {
 				nd->nd_repstat = nfsrv_opencheck(clientid,
 				    stateidp, stp, vp, nd, p, nd->nd_repstat);
 			}
 		}
 	} else {
 		if (ndp->ni_cnd.cn_flags & HASBUF)
 			nfsvno_relpathbuf(ndp);
 		if (ndp->ni_startdir && create == NFSV4OPEN_CREATE) {
 			vrele(ndp->ni_startdir);
 			if (ndp->ni_dvp == ndp->ni_vp)
 				vrele(ndp->ni_dvp);
 			else
 				vput(ndp->ni_dvp);
 			if (ndp->ni_vp)
 				vput(ndp->ni_vp);
 		}
 	}
 	*vpp = vp;
 
 	NFSEXITCODE2(0, nd);
 }
 
 /*
  * Updates the file rev and sets the mtime and ctime
  * to the current clock time, returning the va_filerev and va_Xtime
  * values.
  * Return ESTALE to indicate the vnode is VI_DOOMED.
  */
 int
 nfsvno_updfilerev(struct vnode *vp, struct nfsvattr *nvap,
     struct ucred *cred, struct thread *p)
 {
 	struct vattr va;
 
 	VATTR_NULL(&va);
 	vfs_timestamp(&va.va_mtime);
 	if (NFSVOPISLOCKED(vp) != LK_EXCLUSIVE) {
 		NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
 		if ((vp->v_iflag & VI_DOOMED) != 0)
 			return (ESTALE);
 	}
 	(void) VOP_SETATTR(vp, &va, cred);
 	(void) nfsvno_getattr(vp, nvap, cred, p, 1);
 	return (0);
 }
 
 /*
  * Glue routine to nfsv4_fillattr().
  */
 int
 nfsvno_fillattr(struct nfsrv_descript *nd, struct mount *mp, struct vnode *vp,
     struct nfsvattr *nvap, fhandle_t *fhp, int rderror, nfsattrbit_t *attrbitp,
     struct ucred *cred, struct thread *p, int isdgram, int reterr,
     int supports_nfsv4acls, int at_root, uint64_t mounted_on_fileno)
 {
 	int error;
 
 	error = nfsv4_fillattr(nd, mp, vp, NULL, &nvap->na_vattr, fhp, rderror,
 	    attrbitp, cred, p, isdgram, reterr, supports_nfsv4acls, at_root,
 	    mounted_on_fileno);
 	NFSEXITCODE2(0, nd);
 	return (error);
 }
 
 /* Since the Readdir vnode ops vary, put the entire functions in here. */
 /*
  * nfs readdir service
  * - mallocs what it thinks is enough to read
  *	count rounded up to a multiple of DIRBLKSIZ <= NFS_MAXREADDIR
  * - calls VOP_READDIR()
  * - loops around building the reply
  *	if the output generated exceeds count break out of loop
  *	The NFSM_CLGET macro is used here so that the reply will be packed
  *	tightly in mbuf clusters.
  * - it trims out records with d_fileno == 0
  *	this doesn't matter for Unix clients, but they might confuse clients
  *	for other os'.
  * - it trims out records with d_type == DT_WHT
  *	these cannot be seen through NFS (unless we extend the protocol)
  *     The alternate call nfsrvd_readdirplus() does lookups as well.
  * PS: The NFS protocol spec. does not clarify what the "count" byte
  *	argument is a count of.. just name strings and file id's or the
  *	entire reply rpc or ...
  *	I tried just file name and id sizes and it confused the Sun client,
  *	so I am using the full rpc size now. The "paranoia.." comment refers
  *	to including the status longwords that are not a part of the dir.
  *	"entry" structures, but are in the rpc.
  */
 int
 nfsrvd_readdir(struct nfsrv_descript *nd, int isdgram,
     struct vnode *vp, struct thread *p, struct nfsexstuff *exp)
 {
 	struct dirent *dp;
 	u_int32_t *tl;
 	int dirlen;
 	char *cpos, *cend, *rbuf;
 	struct nfsvattr at;
 	int nlen, error = 0, getret = 1;
 	int siz, cnt, fullsiz, eofflag, ncookies;
 	u_int64_t off, toff, verf;
 	u_long *cookies = NULL, *cookiep;
 	struct uio io;
 	struct iovec iv;
 	int is_ufs;
 
 	if (nd->nd_repstat) {
 		nfsrv_postopattr(nd, getret, &at);
 		goto out;
 	}
 	if (nd->nd_flag & ND_NFSV2) {
 		NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 		off = fxdr_unsigned(u_quad_t, *tl++);
 	} else {
 		NFSM_DISSECT(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
 		off = fxdr_hyper(tl);
 		tl += 2;
 		verf = fxdr_hyper(tl);
 		tl += 2;
 	}
 	toff = off;
 	cnt = fxdr_unsigned(int, *tl);
 	if (cnt > NFS_SRVMAXDATA(nd) || cnt < 0)
 		cnt = NFS_SRVMAXDATA(nd);
 	siz = ((cnt + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1));
 	fullsiz = siz;
 	if (nd->nd_flag & ND_NFSV3) {
 		nd->nd_repstat = getret = nfsvno_getattr(vp, &at, nd->nd_cred,
 		    p, 1);
 #if 0
 		/*
 		 * va_filerev is not sufficient as a cookie verifier,
 		 * since it is not supposed to change when entries are
 		 * removed/added unless that offset cookies returned to
 		 * the client are no longer valid.
 		 */
 		if (!nd->nd_repstat && toff && verf != at.na_filerev)
 			nd->nd_repstat = NFSERR_BAD_COOKIE;
 #endif
 	}
 	if (!nd->nd_repstat && vp->v_type != VDIR)
 		nd->nd_repstat = NFSERR_NOTDIR;
 	if (nd->nd_repstat == 0 && cnt == 0) {
 		if (nd->nd_flag & ND_NFSV2)
 			/* NFSv2 does not have NFSERR_TOOSMALL */
 			nd->nd_repstat = EPERM;
 		else
 			nd->nd_repstat = NFSERR_TOOSMALL;
 	}
 	if (!nd->nd_repstat)
 		nd->nd_repstat = nfsvno_accchk(vp, VEXEC,
 		    nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
 		    NFSACCCHK_VPISLOCKED, NULL);
 	if (nd->nd_repstat) {
 		vput(vp);
 		if (nd->nd_flag & ND_NFSV3)
 			nfsrv_postopattr(nd, getret, &at);
 		goto out;
 	}
 	is_ufs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "ufs") == 0;
 	MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
 again:
 	eofflag = 0;
 	if (cookies) {
 		free((caddr_t)cookies, M_TEMP);
 		cookies = NULL;
 	}
 
 	iv.iov_base = rbuf;
 	iv.iov_len = siz;
 	io.uio_iov = &iv;
 	io.uio_iovcnt = 1;
 	io.uio_offset = (off_t)off;
 	io.uio_resid = siz;
 	io.uio_segflg = UIO_SYSSPACE;
 	io.uio_rw = UIO_READ;
 	io.uio_td = NULL;
 	nd->nd_repstat = VOP_READDIR(vp, &io, nd->nd_cred, &eofflag, &ncookies,
 	    &cookies);
 	off = (u_int64_t)io.uio_offset;
 	if (io.uio_resid)
 		siz -= io.uio_resid;
 
 	if (!cookies && !nd->nd_repstat)
 		nd->nd_repstat = NFSERR_PERM;
 	if (nd->nd_flag & ND_NFSV3) {
 		getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
 		if (!nd->nd_repstat)
 			nd->nd_repstat = getret;
 	}
 
 	/*
 	 * Handles the failed cases. nd->nd_repstat == 0 past here.
 	 */
 	if (nd->nd_repstat) {
 		vput(vp);
 		free((caddr_t)rbuf, M_TEMP);
 		if (cookies)
 			free((caddr_t)cookies, M_TEMP);
 		if (nd->nd_flag & ND_NFSV3)
 			nfsrv_postopattr(nd, getret, &at);
 		goto out;
 	}
 	/*
 	 * If nothing read, return eof
 	 * rpc reply
 	 */
 	if (siz == 0) {
 		vput(vp);
 		if (nd->nd_flag & ND_NFSV2) {
 			NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 		} else {
 			nfsrv_postopattr(nd, getret, &at);
 			NFSM_BUILD(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
 			txdr_hyper(at.na_filerev, tl);
 			tl += 2;
 		}
 		*tl++ = newnfs_false;
 		*tl = newnfs_true;
 		FREE((caddr_t)rbuf, M_TEMP);
 		FREE((caddr_t)cookies, M_TEMP);
 		goto out;
 	}
 
 	/*
 	 * Check for degenerate cases of nothing useful read.
 	 * If so go try again
 	 */
 	cpos = rbuf;
 	cend = rbuf + siz;
 	dp = (struct dirent *)cpos;
 	cookiep = cookies;
 
 	/*
 	 * For some reason FreeBSD's ufs_readdir() chooses to back the
 	 * directory offset up to a block boundary, so it is necessary to
 	 * skip over the records that precede the requested offset. This
 	 * requires the assumption that file offset cookies monotonically
 	 * increase.
 	 */
 	while (cpos < cend && ncookies > 0 &&
 	    (dp->d_fileno == 0 || dp->d_type == DT_WHT ||
 	     (is_ufs == 1 && ((u_quad_t)(*cookiep)) <= toff))) {
 		cpos += dp->d_reclen;
 		dp = (struct dirent *)cpos;
 		cookiep++;
 		ncookies--;
 	}
 	if (cpos >= cend || ncookies == 0) {
 		siz = fullsiz;
 		toff = off;
 		goto again;
 	}
 	vput(vp);
 
 	/*
 	 * dirlen is the size of the reply, including all XDR and must
 	 * not exceed cnt. For NFSv2, RFC1094 didn't clearly indicate
 	 * if the XDR should be included in "count", but to be safe, we do.
 	 * (Include the two booleans at the end of the reply in dirlen now.)
 	 */
 	if (nd->nd_flag & ND_NFSV3) {
 		nfsrv_postopattr(nd, getret, &at);
 		NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 		txdr_hyper(at.na_filerev, tl);
 		dirlen = NFSX_V3POSTOPATTR + NFSX_VERF + 2 * NFSX_UNSIGNED;
 	} else {
 		dirlen = 2 * NFSX_UNSIGNED;
 	}
 
 	/* Loop through the records and build reply */
 	while (cpos < cend && ncookies > 0) {
 		nlen = dp->d_namlen;
 		if (dp->d_fileno != 0 && dp->d_type != DT_WHT &&
 			nlen <= NFS_MAXNAMLEN) {
 			if (nd->nd_flag & ND_NFSV3)
 				dirlen += (6*NFSX_UNSIGNED + NFSM_RNDUP(nlen));
 			else
 				dirlen += (4*NFSX_UNSIGNED + NFSM_RNDUP(nlen));
 			if (dirlen > cnt) {
 				eofflag = 0;
 				break;
 			}
 
 			/*
 			 * Build the directory record xdr from
 			 * the dirent entry.
 			 */
 			if (nd->nd_flag & ND_NFSV3) {
 				NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
 				*tl++ = newnfs_true;
 				*tl++ = 0;
 			} else {
 				NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 				*tl++ = newnfs_true;
 			}
 			*tl = txdr_unsigned(dp->d_fileno);
 			(void) nfsm_strtom(nd, dp->d_name, nlen);
 			if (nd->nd_flag & ND_NFSV3) {
 				NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 				*tl++ = 0;
 			} else
 				NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
 			*tl = txdr_unsigned(*cookiep);
 		}
 		cpos += dp->d_reclen;
 		dp = (struct dirent *)cpos;
 		cookiep++;
 		ncookies--;
 	}
 	if (cpos < cend)
 		eofflag = 0;
 	NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 	*tl++ = newnfs_false;
 	if (eofflag)
 		*tl = newnfs_true;
 	else
 		*tl = newnfs_false;
 	FREE((caddr_t)rbuf, M_TEMP);
 	FREE((caddr_t)cookies, M_TEMP);
 
 out:
 	NFSEXITCODE2(0, nd);
 	return (0);
 nfsmout:
 	vput(vp);
 	NFSEXITCODE2(error, nd);
 	return (error);
 }
 
 /*
  * Readdirplus for V3 and Readdir for V4.
  */
 int
 nfsrvd_readdirplus(struct nfsrv_descript *nd, int isdgram,
     struct vnode *vp, struct thread *p, struct nfsexstuff *exp)
 {
 	struct dirent *dp;
 	u_int32_t *tl;
 	int dirlen;
 	char *cpos, *cend, *rbuf;
 	struct vnode *nvp;
 	fhandle_t nfh;
 	struct nfsvattr nva, at, *nvap = &nva;
 	struct mbuf *mb0, *mb1;
 	struct nfsreferral *refp;
 	int nlen, r, error = 0, getret = 1, usevget = 1;
 	int siz, cnt, fullsiz, eofflag, ncookies, entrycnt;
 	caddr_t bpos0, bpos1;
 	u_int64_t off, toff, verf;
 	u_long *cookies = NULL, *cookiep;
 	nfsattrbit_t attrbits, rderrbits, savbits;
 	struct uio io;
 	struct iovec iv;
 	struct componentname cn;
 	int at_root, is_ufs, is_zfs, needs_unbusy, supports_nfsv4acls;
 	struct mount *mp, *new_mp;
 	uint64_t mounted_on_fileno;
 
 	if (nd->nd_repstat) {
 		nfsrv_postopattr(nd, getret, &at);
 		goto out;
 	}
 	NFSM_DISSECT(tl, u_int32_t *, 6 * NFSX_UNSIGNED);
 	off = fxdr_hyper(tl);
 	toff = off;
 	tl += 2;
 	verf = fxdr_hyper(tl);
 	tl += 2;
 	siz = fxdr_unsigned(int, *tl++);
 	cnt = fxdr_unsigned(int, *tl);
 
 	/*
 	 * Use the server's maximum data transfer size as the upper bound
 	 * on reply datalen.
 	 */
 	if (cnt > NFS_SRVMAXDATA(nd) || cnt < 0)
 		cnt = NFS_SRVMAXDATA(nd);
 
 	/*
 	 * siz is a "hint" of how much directory information (name, fileid,
 	 * cookie) should be in the reply. At least one client "hints" 0,
 	 * so I set it to cnt for that case. I also round it up to the
 	 * next multiple of DIRBLKSIZ.
 	 */
 	if (siz <= 0)
 		siz = cnt;
 	siz = ((siz + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1));
 
 	if (nd->nd_flag & ND_NFSV4) {
 		error = nfsrv_getattrbits(nd, &attrbits, NULL, NULL);
 		if (error)
 			goto nfsmout;
 		NFSSET_ATTRBIT(&savbits, &attrbits);
 		NFSCLRNOTFILLABLE_ATTRBIT(&attrbits);
 		NFSZERO_ATTRBIT(&rderrbits);
 		NFSSETBIT_ATTRBIT(&rderrbits, NFSATTRBIT_RDATTRERROR);
 	} else {
 		NFSZERO_ATTRBIT(&attrbits);
 	}
 	fullsiz = siz;
 	nd->nd_repstat = getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
 	if (!nd->nd_repstat) {
 	    if (off && verf != at.na_filerev) {
 		/*
 		 * va_filerev is not sufficient as a cookie verifier,
 		 * since it is not supposed to change when entries are
 		 * removed/added unless that offset cookies returned to
 		 * the client are no longer valid.
 		 */
 #if 0
 		if (nd->nd_flag & ND_NFSV4) {
 			nd->nd_repstat = NFSERR_NOTSAME;
 		} else {
 			nd->nd_repstat = NFSERR_BAD_COOKIE;
 		}
 #endif
 	    } else if ((nd->nd_flag & ND_NFSV4) && off == 0 && verf != 0) {
 		nd->nd_repstat = NFSERR_BAD_COOKIE;
 	    }
 	}
 	if (!nd->nd_repstat && vp->v_type != VDIR)
 		nd->nd_repstat = NFSERR_NOTDIR;
 	if (!nd->nd_repstat && cnt == 0)
 		nd->nd_repstat = NFSERR_TOOSMALL;
 	if (!nd->nd_repstat)
 		nd->nd_repstat = nfsvno_accchk(vp, VEXEC,
 		    nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
 		    NFSACCCHK_VPISLOCKED, NULL);
 	if (nd->nd_repstat) {
 		vput(vp);
 		if (nd->nd_flag & ND_NFSV3)
 			nfsrv_postopattr(nd, getret, &at);
 		goto out;
 	}
 	is_ufs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "ufs") == 0;
 	is_zfs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "zfs") == 0;
 
 	MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
 again:
 	eofflag = 0;
 	if (cookies) {
 		free((caddr_t)cookies, M_TEMP);
 		cookies = NULL;
 	}
 
 	iv.iov_base = rbuf;
 	iv.iov_len = siz;
 	io.uio_iov = &iv;
 	io.uio_iovcnt = 1;
 	io.uio_offset = (off_t)off;
 	io.uio_resid = siz;
 	io.uio_segflg = UIO_SYSSPACE;
 	io.uio_rw = UIO_READ;
 	io.uio_td = NULL;
 	nd->nd_repstat = VOP_READDIR(vp, &io, nd->nd_cred, &eofflag, &ncookies,
 	    &cookies);
 	off = (u_int64_t)io.uio_offset;
 	if (io.uio_resid)
 		siz -= io.uio_resid;
 
 	getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
 
 	if (!cookies && !nd->nd_repstat)
 		nd->nd_repstat = NFSERR_PERM;
 	if (!nd->nd_repstat)
 		nd->nd_repstat = getret;
 	if (nd->nd_repstat) {
 		vput(vp);
 		if (cookies)
 			free((caddr_t)cookies, M_TEMP);
 		free((caddr_t)rbuf, M_TEMP);
 		if (nd->nd_flag & ND_NFSV3)
 			nfsrv_postopattr(nd, getret, &at);
 		goto out;
 	}
 	/*
 	 * If nothing read, return eof
 	 * rpc reply
 	 */
 	if (siz == 0) {
 		vput(vp);
 		if (nd->nd_flag & ND_NFSV3)
 			nfsrv_postopattr(nd, getret, &at);
 		NFSM_BUILD(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
 		txdr_hyper(at.na_filerev, tl);
 		tl += 2;
 		*tl++ = newnfs_false;
 		*tl = newnfs_true;
 		free((caddr_t)cookies, M_TEMP);
 		free((caddr_t)rbuf, M_TEMP);
 		goto out;
 	}
 
 	/*
 	 * Check for degenerate cases of nothing useful read.
 	 * If so go try again
 	 */
 	cpos = rbuf;
 	cend = rbuf + siz;
 	dp = (struct dirent *)cpos;
 	cookiep = cookies;
 
 	/*
 	 * For some reason FreeBSD's ufs_readdir() chooses to back the
 	 * directory offset up to a block boundary, so it is necessary to
 	 * skip over the records that precede the requested offset. This
 	 * requires the assumption that file offset cookies monotonically
 	 * increase.
 	 */
 	while (cpos < cend && ncookies > 0 &&
 	  (dp->d_fileno == 0 || dp->d_type == DT_WHT ||
 	   (is_ufs == 1 && ((u_quad_t)(*cookiep)) <= toff) ||
 	   ((nd->nd_flag & ND_NFSV4) &&
 	    ((dp->d_namlen == 1 && dp->d_name[0] == '.') ||
 	     (dp->d_namlen==2 && dp->d_name[0]=='.' && dp->d_name[1]=='.'))))) {
 		cpos += dp->d_reclen;
 		dp = (struct dirent *)cpos;
 		cookiep++;
 		ncookies--;
 	}
 	if (cpos >= cend || ncookies == 0) {
 		siz = fullsiz;
 		toff = off;
 		goto again;
 	}
 
 	/*
 	 * Busy the file system so that the mount point won't go away
 	 * and, as such, VFS_VGET() can be used safely.
 	 */
 	mp = vp->v_mount;
 	vfs_ref(mp);
 	NFSVOPUNLOCK(vp, 0);
 	nd->nd_repstat = vfs_busy(mp, 0);
 	vfs_rel(mp);
 	if (nd->nd_repstat != 0) {
 		vrele(vp);
 		free(cookies, M_TEMP);
 		free(rbuf, M_TEMP);
 		if (nd->nd_flag & ND_NFSV3)
 			nfsrv_postopattr(nd, getret, &at);
 		goto out;
 	}
 
 	/*
-	 * Check to see if entries in this directory can be safely acquired
-	 * via VFS_VGET() or if a switch to VOP_LOOKUP() is required.
-	 * ZFS snapshot directories need VOP_LOOKUP(), so that any
-	 * automount of the snapshot directory that is required will
-	 * be done.
-	 * This needs to be done here for NFSv4, since NFSv4 never does
-	 * a VFS_VGET() for "." or "..".
+	 * For now ZFS requires VOP_LOOKUP as a workaround.  Until ino_t is changed
+	 * to 64 bit type a ZFS filesystem with over 1 billion files in it
+	 * will suffer from 64bit -> 32bit truncation.
 	 */
-	if (is_zfs == 1) {
-		r = VFS_VGET(mp, at.na_fileid, LK_SHARED, &nvp);
-		if (r == EOPNOTSUPP) {
-			usevget = 0;
-			cn.cn_nameiop = LOOKUP;
-			cn.cn_lkflags = LK_SHARED | LK_RETRY;
-			cn.cn_cred = nd->nd_cred;
-			cn.cn_thread = p;
-		} else if (r == 0)
-			vput(nvp);
-	}
+	if (is_zfs == 1)
+		usevget = 0;
 
+	cn.cn_nameiop = LOOKUP;
+	cn.cn_lkflags = LK_SHARED | LK_RETRY;
+	cn.cn_cred = nd->nd_cred;
+	cn.cn_thread = p;
+
 	/*
 	 * Save this position, in case there is an error before one entry
 	 * is created.
 	 */
 	mb0 = nd->nd_mb;
 	bpos0 = nd->nd_bpos;
 
 	/*
 	 * Fill in the first part of the reply.
 	 * dirlen is the reply length in bytes and cannot exceed cnt.
 	 * (Include the two booleans at the end of the reply in dirlen now,
 	 *  so we recognize when we have exceeded cnt.)
 	 */
 	if (nd->nd_flag & ND_NFSV3) {
 		dirlen = NFSX_V3POSTOPATTR + NFSX_VERF + 2 * NFSX_UNSIGNED;
 		nfsrv_postopattr(nd, getret, &at);
 	} else {
 		dirlen = NFSX_VERF + 2 * NFSX_UNSIGNED;
 	}
 	NFSM_BUILD(tl, u_int32_t *, NFSX_VERF);
 	txdr_hyper(at.na_filerev, tl);
 
 	/*
 	 * Save this position, in case there is an empty reply needed.
 	 */
 	mb1 = nd->nd_mb;
 	bpos1 = nd->nd_bpos;
 
 	/* Loop through the records and build reply */
 	entrycnt = 0;
 	while (cpos < cend && ncookies > 0 && dirlen < cnt) {
 		nlen = dp->d_namlen;
 		if (dp->d_fileno != 0 && dp->d_type != DT_WHT &&
 		    nlen <= NFS_MAXNAMLEN &&
 		    ((nd->nd_flag & ND_NFSV3) || nlen > 2 ||
 		     (nlen==2 && (dp->d_name[0]!='.' || dp->d_name[1]!='.'))
 		      || (nlen == 1 && dp->d_name[0] != '.'))) {
 			/*
 			 * Save the current position in the reply, in case
 			 * this entry exceeds cnt.
 			 */
 			mb1 = nd->nd_mb;
 			bpos1 = nd->nd_bpos;
 	
 			/*
 			 * For readdir_and_lookup get the vnode using
 			 * the file number.
 			 */
 			nvp = NULL;
 			refp = NULL;
 			r = 0;
 			at_root = 0;
 			needs_unbusy = 0;
 			new_mp = mp;
 			mounted_on_fileno = (uint64_t)dp->d_fileno;
 			if ((nd->nd_flag & ND_NFSV3) ||
 			    NFSNONZERO_ATTRBIT(&savbits)) {
 				if (nd->nd_flag & ND_NFSV4)
 					refp = nfsv4root_getreferral(NULL,
 					    vp, dp->d_fileno);
 				if (refp == NULL) {
 					if (usevget)
 						r = VFS_VGET(mp, dp->d_fileno,
 						    LK_SHARED, &nvp);
 					else
 						r = EOPNOTSUPP;
 					if (r == EOPNOTSUPP) {
-						if (usevget) {
-							usevget = 0;
-							cn.cn_nameiop = LOOKUP;
-							cn.cn_lkflags =
-							    LK_SHARED |
-							    LK_RETRY;
-							cn.cn_cred =
-							    nd->nd_cred;
-							cn.cn_thread = p;
-						}
+						usevget = 0;
 						cn.cn_nameptr = dp->d_name;
 						cn.cn_namelen = nlen;
 						cn.cn_flags = ISLASTCN |
 						    NOFOLLOW | LOCKLEAF;
 						if (nlen == 2 &&
 						    dp->d_name[0] == '.' &&
 						    dp->d_name[1] == '.')
 							cn.cn_flags |=
 							    ISDOTDOT;
 						if (NFSVOPLOCK(vp, LK_SHARED)
 						    != 0) {
 							nd->nd_repstat = EPERM;
 							break;
 						}
 						if ((vp->v_vflag & VV_ROOT) != 0
 						    && (cn.cn_flags & ISDOTDOT)
 						    != 0) {
 							vref(vp);
 							nvp = vp;
 							r = 0;
 						} else {
 							r = VOP_LOOKUP(vp, &nvp,
 							    &cn);
 							if (vp != nvp)
 								NFSVOPUNLOCK(vp,
 								    0);
 						}
 					}
 
 					/*
 					 * For NFSv4, check to see if nvp is
 					 * a mount point and get the mount
 					 * point vnode, as required.
 					 */
 					if (r == 0 &&
 					    nfsrv_enable_crossmntpt != 0 &&
 					    (nd->nd_flag & ND_NFSV4) != 0 &&
 					    nvp->v_type == VDIR &&
 					    nvp->v_mountedhere != NULL) {
 						new_mp = nvp->v_mountedhere;
 						r = vfs_busy(new_mp, 0);
 						vput(nvp);
 						nvp = NULL;
 						if (r == 0) {
 							r = VFS_ROOT(new_mp,
 							    LK_SHARED, &nvp);
 							needs_unbusy = 1;
 							if (r == 0)
 								at_root = 1;
 						}
 					}
 				}
 				if (!r) {
 				    if (refp == NULL &&
 					((nd->nd_flag & ND_NFSV3) ||
 					 NFSNONZERO_ATTRBIT(&attrbits))) {
 					r = nfsvno_getfh(nvp, &nfh, p);
 					if (!r)
 					    r = nfsvno_getattr(nvp, nvap,
 						nd->nd_cred, p, 1);
 					if (r == 0 && is_zfs == 1 &&
 					    nfsrv_enable_crossmntpt != 0 &&
 					    (nd->nd_flag & ND_NFSV4) != 0 &&
 					    nvp->v_type == VDIR &&
 					    vp->v_mount != nvp->v_mount) {
 					    /*
 					     * For a ZFS snapshot, there is a
 					     * pseudo mount that does not set
 					     * v_mountedhere, so it needs to
 					     * be detected via a different
 					     * mount structure.
 					     */
 					    at_root = 1;
 					    if (new_mp == mp)
 						new_mp = nvp->v_mount;
 					}
 				    }
 				} else {
 				    nvp = NULL;
 				}
 				if (r) {
 					if (!NFSISSET_ATTRBIT(&attrbits,
 					    NFSATTRBIT_RDATTRERROR)) {
 						if (nvp != NULL)
 							vput(nvp);
 						if (needs_unbusy != 0)
 							vfs_unbusy(new_mp);
 						nd->nd_repstat = r;
 						break;
 					}
 				}
 			}
 
 			/*
 			 * Build the directory record xdr
 			 */
 			if (nd->nd_flag & ND_NFSV3) {
 				NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
 				*tl++ = newnfs_true;
 				*tl++ = 0;
 				*tl = txdr_unsigned(dp->d_fileno);
 				dirlen += nfsm_strtom(nd, dp->d_name, nlen);
 				NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 				*tl++ = 0;
 				*tl = txdr_unsigned(*cookiep);
 				nfsrv_postopattr(nd, 0, nvap);
 				dirlen += nfsm_fhtom(nd,(u_int8_t *)&nfh,0,1);
 				dirlen += (5*NFSX_UNSIGNED+NFSX_V3POSTOPATTR);
 				if (nvp != NULL)
 					vput(nvp);
 			} else {
 				NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
 				*tl++ = newnfs_true;
 				*tl++ = 0;
 				*tl = txdr_unsigned(*cookiep);
 				dirlen += nfsm_strtom(nd, dp->d_name, nlen);
 				if (nvp != NULL) {
 					supports_nfsv4acls =
 					    nfs_supportsnfsv4acls(nvp);
 					NFSVOPUNLOCK(nvp, 0);
 				} else
 					supports_nfsv4acls = 0;
 				if (refp != NULL) {
 					dirlen += nfsrv_putreferralattr(nd,
 					    &savbits, refp, 0,
 					    &nd->nd_repstat);
 					if (nd->nd_repstat) {
 						if (nvp != NULL)
 							vrele(nvp);
 						if (needs_unbusy != 0)
 							vfs_unbusy(new_mp);
 						break;
 					}
 				} else if (r) {
 					dirlen += nfsvno_fillattr(nd, new_mp,
 					    nvp, nvap, &nfh, r, &rderrbits,
 					    nd->nd_cred, p, isdgram, 0,
 					    supports_nfsv4acls, at_root,
 					    mounted_on_fileno);
 				} else {
 					dirlen += nfsvno_fillattr(nd, new_mp,
 					    nvp, nvap, &nfh, r, &attrbits,
 					    nd->nd_cred, p, isdgram, 0,
 					    supports_nfsv4acls, at_root,
 					    mounted_on_fileno);
 				}
 				if (nvp != NULL)
 					vrele(nvp);
 				dirlen += (3 * NFSX_UNSIGNED);
 			}
 			if (needs_unbusy != 0)
 				vfs_unbusy(new_mp);
 			if (dirlen <= cnt)
 				entrycnt++;
 		}
 		cpos += dp->d_reclen;
 		dp = (struct dirent *)cpos;
 		cookiep++;
 		ncookies--;
 	}
 	vrele(vp);
 	vfs_unbusy(mp);
 
 	/*
 	 * If dirlen > cnt, we must strip off the last entry. If that
 	 * results in an empty reply, report NFSERR_TOOSMALL.
 	 */
 	if (dirlen > cnt || nd->nd_repstat) {
 		if (!nd->nd_repstat && entrycnt == 0)
 			nd->nd_repstat = NFSERR_TOOSMALL;
 		if (nd->nd_repstat) {
 			newnfs_trimtrailing(nd, mb0, bpos0);
 			if (nd->nd_flag & ND_NFSV3)
 				nfsrv_postopattr(nd, getret, &at);
 		} else
 			newnfs_trimtrailing(nd, mb1, bpos1);
 		eofflag = 0;
 	} else if (cpos < cend)
 		eofflag = 0;
 	if (!nd->nd_repstat) {
 		NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 		*tl++ = newnfs_false;
 		if (eofflag)
 			*tl = newnfs_true;
 		else
 			*tl = newnfs_false;
 	}
 	FREE((caddr_t)cookies, M_TEMP);
 	FREE((caddr_t)rbuf, M_TEMP);
 
 out:
 	NFSEXITCODE2(0, nd);
 	return (0);
 nfsmout:
 	vput(vp);
 	NFSEXITCODE2(error, nd);
 	return (error);
 }
 
 /*
  * Get the settable attributes out of the mbuf list.
  * (Return 0 or EBADRPC)
  */
 int
 nfsrv_sattr(struct nfsrv_descript *nd, vnode_t vp, struct nfsvattr *nvap,
     nfsattrbit_t *attrbitp, NFSACL_T *aclp, struct thread *p)
 {
 	u_int32_t *tl;
 	struct nfsv2_sattr *sp;
 	int error = 0, toclient = 0;
 
 	switch (nd->nd_flag & (ND_NFSV2 | ND_NFSV3 | ND_NFSV4)) {
 	case ND_NFSV2:
 		NFSM_DISSECT(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
 		/*
 		 * Some old clients didn't fill in the high order 16bits.
 		 * --> check the low order 2 bytes for 0xffff
 		 */
 		if ((fxdr_unsigned(int, sp->sa_mode) & 0xffff) != 0xffff)
 			nvap->na_mode = nfstov_mode(sp->sa_mode);
 		if (sp->sa_uid != newnfs_xdrneg1)
 			nvap->na_uid = fxdr_unsigned(uid_t, sp->sa_uid);
 		if (sp->sa_gid != newnfs_xdrneg1)
 			nvap->na_gid = fxdr_unsigned(gid_t, sp->sa_gid);
 		if (sp->sa_size != newnfs_xdrneg1)
 			nvap->na_size = fxdr_unsigned(u_quad_t, sp->sa_size);
 		if (sp->sa_atime.nfsv2_sec != newnfs_xdrneg1) {
 #ifdef notyet
 			fxdr_nfsv2time(&sp->sa_atime, &nvap->na_atime);
 #else
 			nvap->na_atime.tv_sec =
 				fxdr_unsigned(u_int32_t,sp->sa_atime.nfsv2_sec);
 			nvap->na_atime.tv_nsec = 0;
 #endif
 		}
 		if (sp->sa_mtime.nfsv2_sec != newnfs_xdrneg1)
 			fxdr_nfsv2time(&sp->sa_mtime, &nvap->na_mtime);
 		break;
 	case ND_NFSV3:
 		NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 		if (*tl == newnfs_true) {
 			NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 			nvap->na_mode = nfstov_mode(*tl);
 		}
 		NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 		if (*tl == newnfs_true) {
 			NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 			nvap->na_uid = fxdr_unsigned(uid_t, *tl);
 		}
 		NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 		if (*tl == newnfs_true) {
 			NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 			nvap->na_gid = fxdr_unsigned(gid_t, *tl);
 		}
 		NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 		if (*tl == newnfs_true) {
 			NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 			nvap->na_size = fxdr_hyper(tl);
 		}
 		NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 		switch (fxdr_unsigned(int, *tl)) {
 		case NFSV3SATTRTIME_TOCLIENT:
 			NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 			fxdr_nfsv3time(tl, &nvap->na_atime);
 			toclient = 1;
 			break;
 		case NFSV3SATTRTIME_TOSERVER:
 			vfs_timestamp(&nvap->na_atime);
 			nvap->na_vaflags |= VA_UTIMES_NULL;
 			break;
 		}
 		NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 		switch (fxdr_unsigned(int, *tl)) {
 		case NFSV3SATTRTIME_TOCLIENT:
 			NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 			fxdr_nfsv3time(tl, &nvap->na_mtime);
 			nvap->na_vaflags &= ~VA_UTIMES_NULL;
 			break;
 		case NFSV3SATTRTIME_TOSERVER:
 			vfs_timestamp(&nvap->na_mtime);
 			if (!toclient)
 				nvap->na_vaflags |= VA_UTIMES_NULL;
 			break;
 		}
 		break;
 	case ND_NFSV4:
 		error = nfsv4_sattr(nd, vp, nvap, attrbitp, aclp, p);
 	}
 nfsmout:
 	NFSEXITCODE2(error, nd);
 	return (error);
 }
 
 /*
  * Handle the setable attributes for V4.
  * Returns NFSERR_BADXDR if it can't be parsed, 0 otherwise.
  */
 int
 nfsv4_sattr(struct nfsrv_descript *nd, vnode_t vp, struct nfsvattr *nvap,
     nfsattrbit_t *attrbitp, NFSACL_T *aclp, struct thread *p)
 {
 	u_int32_t *tl;
 	int attrsum = 0;
 	int i, j;
 	int error, attrsize, bitpos, aclsize, aceerr, retnotsup = 0;
 	int toclient = 0;
 	u_char *cp, namestr[NFSV4_SMALLSTR + 1];
 	uid_t uid;
 	gid_t gid;
 
 	error = nfsrv_getattrbits(nd, attrbitp, NULL, &retnotsup);
 	if (error)
 		goto nfsmout;
 	NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 	attrsize = fxdr_unsigned(int, *tl);
 
 	/*
 	 * Loop around getting the setable attributes. If an unsupported
 	 * one is found, set nd_repstat == NFSERR_ATTRNOTSUPP and return.
 	 */
 	if (retnotsup) {
 		nd->nd_repstat = NFSERR_ATTRNOTSUPP;
 		bitpos = NFSATTRBIT_MAX;
 	} else {
 		bitpos = 0;
 	}
 	for (; bitpos < NFSATTRBIT_MAX; bitpos++) {
 	    if (attrsum > attrsize) {
 		error = NFSERR_BADXDR;
 		goto nfsmout;
 	    }
 	    if (NFSISSET_ATTRBIT(attrbitp, bitpos))
 		switch (bitpos) {
 		case NFSATTRBIT_SIZE:
 			NFSM_DISSECT(tl, u_int32_t *, NFSX_HYPER);
                      if (vp != NULL && vp->v_type != VREG) {
                             error = (vp->v_type == VDIR) ? NFSERR_ISDIR :
                                 NFSERR_INVAL;
                             goto nfsmout;
 			}
 			nvap->na_size = fxdr_hyper(tl);
 			attrsum += NFSX_HYPER;
 			break;
 		case NFSATTRBIT_ACL:
 			error = nfsrv_dissectacl(nd, aclp, &aceerr, &aclsize,
 			    p);
 			if (error)
 				goto nfsmout;
 			if (aceerr && !nd->nd_repstat)
 				nd->nd_repstat = aceerr;
 			attrsum += aclsize;
 			break;
 		case NFSATTRBIT_ARCHIVE:
 			NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 			if (!nd->nd_repstat)
 				nd->nd_repstat = NFSERR_ATTRNOTSUPP;
 			attrsum += NFSX_UNSIGNED;
 			break;
 		case NFSATTRBIT_HIDDEN:
 			NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 			if (!nd->nd_repstat)
 				nd->nd_repstat = NFSERR_ATTRNOTSUPP;
 			attrsum += NFSX_UNSIGNED;
 			break;
 		case NFSATTRBIT_MIMETYPE:
 			NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 			i = fxdr_unsigned(int, *tl);
 			error = nfsm_advance(nd, NFSM_RNDUP(i), -1);
 			if (error)
 				goto nfsmout;
 			if (!nd->nd_repstat)
 				nd->nd_repstat = NFSERR_ATTRNOTSUPP;
 			attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(i));
 			break;
 		case NFSATTRBIT_MODE:
 			NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 			nvap->na_mode = nfstov_mode(*tl);
 			attrsum += NFSX_UNSIGNED;
 			break;
 		case NFSATTRBIT_OWNER:
 			NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 			j = fxdr_unsigned(int, *tl);
 			if (j < 0) {
 				error = NFSERR_BADXDR;
 				goto nfsmout;
 			}
 			if (j > NFSV4_SMALLSTR)
 				cp = malloc(j + 1, M_NFSSTRING, M_WAITOK);
 			else
 				cp = namestr;
 			error = nfsrv_mtostr(nd, cp, j);
 			if (error) {
 				if (j > NFSV4_SMALLSTR)
 					free(cp, M_NFSSTRING);
 				goto nfsmout;
 			}
 			if (!nd->nd_repstat) {
 				nd->nd_repstat = nfsv4_strtouid(nd, cp, j, &uid,
 				    p);
 				if (!nd->nd_repstat)
 					nvap->na_uid = uid;
 			}
 			if (j > NFSV4_SMALLSTR)
 				free(cp, M_NFSSTRING);
 			attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(j));
 			break;
 		case NFSATTRBIT_OWNERGROUP:
 			NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 			j = fxdr_unsigned(int, *tl);
 			if (j < 0) {
 				error = NFSERR_BADXDR;
 				goto nfsmout;
 			}
 			if (j > NFSV4_SMALLSTR)
 				cp = malloc(j + 1, M_NFSSTRING, M_WAITOK);
 			else
 				cp = namestr;
 			error = nfsrv_mtostr(nd, cp, j);
 			if (error) {
 				if (j > NFSV4_SMALLSTR)
 					free(cp, M_NFSSTRING);
 				goto nfsmout;
 			}
 			if (!nd->nd_repstat) {
 				nd->nd_repstat = nfsv4_strtogid(nd, cp, j, &gid,
 				    p);
 				if (!nd->nd_repstat)
 					nvap->na_gid = gid;
 			}
 			if (j > NFSV4_SMALLSTR)
 				free(cp, M_NFSSTRING);
 			attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(j));
 			break;
 		case NFSATTRBIT_SYSTEM:
 			NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 			if (!nd->nd_repstat)
 				nd->nd_repstat = NFSERR_ATTRNOTSUPP;
 			attrsum += NFSX_UNSIGNED;
 			break;
 		case NFSATTRBIT_TIMEACCESSSET:
 			NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 			attrsum += NFSX_UNSIGNED;
 			if (fxdr_unsigned(int, *tl)==NFSV4SATTRTIME_TOCLIENT) {
 			    NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
 			    fxdr_nfsv4time(tl, &nvap->na_atime);
 			    toclient = 1;
 			    attrsum += NFSX_V4TIME;
 			} else {
 			    vfs_timestamp(&nvap->na_atime);
 			    nvap->na_vaflags |= VA_UTIMES_NULL;
 			}
 			break;
 		case NFSATTRBIT_TIMEBACKUP:
 			NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
 			if (!nd->nd_repstat)
 				nd->nd_repstat = NFSERR_ATTRNOTSUPP;
 			attrsum += NFSX_V4TIME;
 			break;
 		case NFSATTRBIT_TIMECREATE:
 			NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
 			if (!nd->nd_repstat)
 				nd->nd_repstat = NFSERR_ATTRNOTSUPP;
 			attrsum += NFSX_V4TIME;
 			break;
 		case NFSATTRBIT_TIMEMODIFYSET:
 			NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 			attrsum += NFSX_UNSIGNED;
 			if (fxdr_unsigned(int, *tl)==NFSV4SATTRTIME_TOCLIENT) {
 			    NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
 			    fxdr_nfsv4time(tl, &nvap->na_mtime);
 			    nvap->na_vaflags &= ~VA_UTIMES_NULL;
 			    attrsum += NFSX_V4TIME;
 			} else {
 			    vfs_timestamp(&nvap->na_mtime);
 			    if (!toclient)
 				nvap->na_vaflags |= VA_UTIMES_NULL;
 			}
 			break;
 		default:
 			nd->nd_repstat = NFSERR_ATTRNOTSUPP;
 			/*
 			 * set bitpos so we drop out of the loop.
 			 */
 			bitpos = NFSATTRBIT_MAX;
 			break;
 		}
 	}
 
 	/*
 	 * some clients pad the attrlist, so we need to skip over the
 	 * padding.
 	 */
 	if (attrsum > attrsize) {
 		error = NFSERR_BADXDR;
 	} else {
 		attrsize = NFSM_RNDUP(attrsize);
 		if (attrsum < attrsize)
 			error = nfsm_advance(nd, attrsize - attrsum, -1);
 	}
 nfsmout:
 	NFSEXITCODE2(error, nd);
 	return (error);
 }
 
 /*
  * Check/setup export credentials.
  */
 int
 nfsd_excred(struct nfsrv_descript *nd, struct nfsexstuff *exp,
     struct ucred *credanon)
 {
 	int error = 0;
 
 	/*
 	 * Check/setup credentials.
 	 */
 	if (nd->nd_flag & ND_GSS)
 		exp->nes_exflag &= ~MNT_EXPORTANON;
 
 	/*
 	 * Check to see if the operation is allowed for this security flavor.
 	 * RFC2623 suggests that the NFSv3 Fsinfo RPC be allowed to
 	 * AUTH_NONE or AUTH_SYS for file systems requiring RPCSEC_GSS.
 	 * Also, allow Secinfo, so that it can acquire the correct flavor(s).
 	 */
 	if (nfsvno_testexp(nd, exp) &&
 	    nd->nd_procnum != NFSV4OP_SECINFO &&
 	    nd->nd_procnum != NFSPROC_FSINFO) {
 		if (nd->nd_flag & ND_NFSV4)
 			error = NFSERR_WRONGSEC;
 		else
 			error = (NFSERR_AUTHERR | AUTH_TOOWEAK);
 		goto out;
 	}
 
 	/*
 	 * Check to see if the file system is exported V4 only.
 	 */
 	if (NFSVNO_EXV4ONLY(exp) && !(nd->nd_flag & ND_NFSV4)) {
 		error = NFSERR_PROGNOTV4;
 		goto out;
 	}
 
 	/*
 	 * Now, map the user credentials.
 	 * (Note that ND_AUTHNONE will only be set for an NFSv3
 	 *  Fsinfo RPC. If set for anything else, this code might need
 	 *  to change.)
 	 */
 	if (NFSVNO_EXPORTED(exp)) {
 		if (((nd->nd_flag & ND_GSS) == 0 && nd->nd_cred->cr_uid == 0) ||
 		     NFSVNO_EXPORTANON(exp) ||
 		     (nd->nd_flag & ND_AUTHNONE) != 0) {
 			nd->nd_cred->cr_uid = credanon->cr_uid;
 			nd->nd_cred->cr_gid = credanon->cr_gid;
 			crsetgroups(nd->nd_cred, credanon->cr_ngroups,
 			    credanon->cr_groups);
 		} else if ((nd->nd_flag & ND_GSS) == 0) {
 			/*
 			 * If using AUTH_SYS, call nfsrv_getgrpscred() to see
 			 * if there is a replacement credential with a group
 			 * list set up by "nfsuserd -manage-gids".
 			 * If there is no replacement, nfsrv_getgrpscred()
 			 * simply returns its argument.
 			 */
 			nd->nd_cred = nfsrv_getgrpscred(nd->nd_cred);
 		}
 	}
 
 out:
 	NFSEXITCODE2(error, nd);
 	return (error);
 }
 
 /*
  * Check exports.
  */
 int
 nfsvno_checkexp(struct mount *mp, struct sockaddr *nam, struct nfsexstuff *exp,
     struct ucred **credp)
 {
 	int i, error, *secflavors;
 
 	error = VFS_CHECKEXP(mp, nam, &exp->nes_exflag, credp,
 	    &exp->nes_numsecflavor, &secflavors);
 	if (error) {
 		if (nfs_rootfhset) {
 			exp->nes_exflag = 0;
 			exp->nes_numsecflavor = 0;
 			error = 0;
 		}
 	} else {
 		/* Copy the security flavors. */
 		for (i = 0; i < exp->nes_numsecflavor; i++)
 			exp->nes_secflavors[i] = secflavors[i];
 	}
 	NFSEXITCODE(error);
 	return (error);
 }
 
 /*
  * Get a vnode for a file handle and export stuff.
  */
 int
 nfsvno_fhtovp(struct mount *mp, fhandle_t *fhp, struct sockaddr *nam,
     int lktype, struct vnode **vpp, struct nfsexstuff *exp,
     struct ucred **credp)
 {
 	int i, error, *secflavors;
 
 	*credp = NULL;
 	exp->nes_numsecflavor = 0;
 	error = VFS_FHTOVP(mp, &fhp->fh_fid, lktype, vpp);
 	if (error != 0)
 		/* Make sure the server replies ESTALE to the client. */
 		error = ESTALE;
 	if (nam && !error) {
 		error = VFS_CHECKEXP(mp, nam, &exp->nes_exflag, credp,
 		    &exp->nes_numsecflavor, &secflavors);
 		if (error) {
 			if (nfs_rootfhset) {
 				exp->nes_exflag = 0;
 				exp->nes_numsecflavor = 0;
 				error = 0;
 			} else {
 				vput(*vpp);
 			}
 		} else {
 			/* Copy the security flavors. */
 			for (i = 0; i < exp->nes_numsecflavor; i++)
 				exp->nes_secflavors[i] = secflavors[i];
 		}
 	}
 	NFSEXITCODE(error);
 	return (error);
 }
 
 /*
  * nfsd_fhtovp() - convert a fh to a vnode ptr
  * 	- look up fsid in mount list (if not found ret error)
  *	- get vp and export rights by calling nfsvno_fhtovp()
  *	- if cred->cr_uid == 0 or MNT_EXPORTANON set it to credanon
  *	  for AUTH_SYS
  *	- if mpp != NULL, return the mount point so that it can
  *	  be used for vn_finished_write() by the caller
  */
 void
 nfsd_fhtovp(struct nfsrv_descript *nd, struct nfsrvfh *nfp, int lktype,
     struct vnode **vpp, struct nfsexstuff *exp,
     struct mount **mpp, int startwrite, struct thread *p)
 {
 	struct mount *mp;
 	struct ucred *credanon;
 	fhandle_t *fhp;
 
 	fhp = (fhandle_t *)nfp->nfsrvfh_data;
 	/*
 	 * Check for the special case of the nfsv4root_fh.
 	 */
 	mp = vfs_busyfs(&fhp->fh_fsid);
 	if (mpp != NULL)
 		*mpp = mp;
 	if (mp == NULL) {
 		*vpp = NULL;
 		nd->nd_repstat = ESTALE;
 		goto out;
 	}
 
 	if (startwrite) {
 		vn_start_write(NULL, mpp, V_WAIT);
 		if (lktype == LK_SHARED && !(MNT_SHARED_WRITES(mp)))
 			lktype = LK_EXCLUSIVE;
 	}
 	nd->nd_repstat = nfsvno_fhtovp(mp, fhp, nd->nd_nam, lktype, vpp, exp,
 	    &credanon);
 	vfs_unbusy(mp);
 
 	/*
 	 * For NFSv4 without a pseudo root fs, unexported file handles
 	 * can be returned, so that Lookup works everywhere.
 	 */
 	if (!nd->nd_repstat && exp->nes_exflag == 0 &&
 	    !(nd->nd_flag & ND_NFSV4)) {
 		vput(*vpp);
 		nd->nd_repstat = EACCES;
 	}
 
 	/*
 	 * Personally, I've never seen any point in requiring a
 	 * reserved port#, since only in the rare case where the
 	 * clients are all boxes with secure system privileges,
 	 * does it provide any enhanced security, but... some people
 	 * believe it to be useful and keep putting this code back in.
 	 * (There is also some "security checker" out there that
 	 *  complains if the nfs server doesn't enforce this.)
 	 * However, note the following:
 	 * RFC3530 (NFSv4) specifies that a reserved port# not be
 	 *	required.
 	 * RFC2623 recommends that, if a reserved port# is checked for,
 	 *	that there be a way to turn that off--> ifdef'd.
 	 */
 #ifdef NFS_REQRSVPORT
 	if (!nd->nd_repstat) {
 		struct sockaddr_in *saddr;
 		struct sockaddr_in6 *saddr6;
 
 		saddr = NFSSOCKADDR(nd->nd_nam, struct sockaddr_in *);
 		saddr6 = NFSSOCKADDR(nd->nd_nam, struct sockaddr_in6 *);
 		if (!(nd->nd_flag & ND_NFSV4) &&
 		    ((saddr->sin_family == AF_INET &&
 		      ntohs(saddr->sin_port) >= IPPORT_RESERVED) ||
 		     (saddr6->sin6_family == AF_INET6 &&
 		      ntohs(saddr6->sin6_port) >= IPPORT_RESERVED))) {
 			vput(*vpp);
 			nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
 		}
 	}
 #endif	/* NFS_REQRSVPORT */
 
 	/*
 	 * Check/setup credentials.
 	 */
 	if (!nd->nd_repstat) {
 		nd->nd_saveduid = nd->nd_cred->cr_uid;
 		nd->nd_repstat = nfsd_excred(nd, exp, credanon);
 		if (nd->nd_repstat)
 			vput(*vpp);
 	}
 	if (credanon != NULL)
 		crfree(credanon);
 	if (nd->nd_repstat) {
 		if (startwrite)
 			vn_finished_write(mp);
 		*vpp = NULL;
 		if (mpp != NULL)
 			*mpp = NULL;
 	}
 
 out:
 	NFSEXITCODE2(0, nd);
 }
 
 /*
  * glue for fp.
  */
 static int
 fp_getfvp(struct thread *p, int fd, struct file **fpp, struct vnode **vpp)
 {
 	struct filedesc *fdp;
 	struct file *fp;
 	int error = 0;
 
 	fdp = p->td_proc->p_fd;
 	if (fd < 0 || fd >= fdp->fd_nfiles ||
 	    (fp = fdp->fd_ofiles[fd].fde_file) == NULL) {
 		error = EBADF;
 		goto out;
 	}
 	*fpp = fp;
 
 out:
 	NFSEXITCODE(error);
 	return (error);
 }
 
 /*
  * Called from nfssvc() to update the exports list. Just call
  * vfs_export(). This has to be done, since the v4 root fake fs isn't
  * in the mount list.
  */
 int
 nfsrv_v4rootexport(void *argp, struct ucred *cred, struct thread *p)
 {
 	struct nfsex_args *nfsexargp = (struct nfsex_args *)argp;
 	int error = 0;
 	struct nameidata nd;
 	fhandle_t fh;
 
 	error = vfs_export(&nfsv4root_mnt, &nfsexargp->export);
 	if ((nfsexargp->export.ex_flags & MNT_DELEXPORT) != 0)
 		nfs_rootfhset = 0;
 	else if (error == 0) {
 		if (nfsexargp->fspec == NULL) {
 			error = EPERM;
 			goto out;
 		}
 		/*
 		 * If fspec != NULL, this is the v4root path.
 		 */
 		NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE,
 		    nfsexargp->fspec, p);
 		if ((error = namei(&nd)) != 0)
 			goto out;
 		error = nfsvno_getfh(nd.ni_vp, &fh, p);
 		vrele(nd.ni_vp);
 		if (!error) {
 			nfs_rootfh.nfsrvfh_len = NFSX_MYFH;
 			NFSBCOPY((caddr_t)&fh,
 			    nfs_rootfh.nfsrvfh_data,
 			    sizeof (fhandle_t));
 			nfs_rootfhset = 1;
 		}
 	}
 
 out:
 	NFSEXITCODE(error);
 	return (error);
 }
 
 /*
  * This function needs to test to see if the system is near its limit
  * for memory allocation via malloc() or mget() and return True iff
  * either of these resources are near their limit.
  * XXX (For now, this is just a stub.)
  */
 int nfsrv_testmalloclimit = 0;
 int
 nfsrv_mallocmget_limit(void)
 {
 	static int printmesg = 0;
 	static int testval = 1;
 
 	if (nfsrv_testmalloclimit && (testval++ % 1000) == 0) {
 		if ((printmesg++ % 100) == 0)
 			printf("nfsd: malloc/mget near limit\n");
 		return (1);
 	}
 	return (0);
 }
 
 /*
  * BSD specific initialization of a mount point.
  */
 void
 nfsd_mntinit(void)
 {
 	static int inited = 0;
 
 	if (inited)
 		return;
 	inited = 1;
 	nfsv4root_mnt.mnt_flag = (MNT_RDONLY | MNT_EXPORTED);
 	TAILQ_INIT(&nfsv4root_mnt.mnt_nvnodelist);
 	TAILQ_INIT(&nfsv4root_mnt.mnt_activevnodelist);
 	nfsv4root_mnt.mnt_export = NULL;
 	TAILQ_INIT(&nfsv4root_opt);
 	TAILQ_INIT(&nfsv4root_newopt);
 	nfsv4root_mnt.mnt_opt = &nfsv4root_opt;
 	nfsv4root_mnt.mnt_optnew = &nfsv4root_newopt;
 	nfsv4root_mnt.mnt_nvnodelistsize = 0;
 	nfsv4root_mnt.mnt_activevnodelistsize = 0;
 }
 
 /*
  * Get a vnode for a file handle, without checking exports, etc.
  */
 struct vnode *
 nfsvno_getvp(fhandle_t *fhp)
 {
 	struct mount *mp;
 	struct vnode *vp;
 	int error;
 
 	mp = vfs_busyfs(&fhp->fh_fsid);
 	if (mp == NULL)
 		return (NULL);
 	error = VFS_FHTOVP(mp, &fhp->fh_fid, LK_EXCLUSIVE, &vp);
 	vfs_unbusy(mp);
 	if (error)
 		return (NULL);
 	return (vp);
 }
 
 /*
  * Do a local VOP_ADVLOCK().
  */
 int
 nfsvno_advlock(struct vnode *vp, int ftype, u_int64_t first,
     u_int64_t end, struct thread *td)
 {
 	int error = 0;
 	struct flock fl;
 	u_int64_t tlen;
 
 	if (nfsrv_dolocallocks == 0)
 		goto out;
 	ASSERT_VOP_UNLOCKED(vp, "nfsvno_advlock: vp locked");
 
 	fl.l_whence = SEEK_SET;
 	fl.l_type = ftype;
 	fl.l_start = (off_t)first;
 	if (end == NFS64BITSSET) {
 		fl.l_len = 0;
 	} else {
 		tlen = end - first;
 		fl.l_len = (off_t)tlen;
 	}
 	/*
 	 * For FreeBSD8, the l_pid and l_sysid must be set to the same
 	 * values for all calls, so that all locks will be held by the
 	 * nfsd server. (The nfsd server handles conflicts between the
 	 * various clients.)
 	 * Since an NFSv4 lockowner is a ClientID plus an array of up to 1024
 	 * bytes, so it can't be put in l_sysid.
 	 */
 	if (nfsv4_sysid == 0)
 		nfsv4_sysid = nlm_acquire_next_sysid();
 	fl.l_pid = (pid_t)0;
 	fl.l_sysid = (int)nfsv4_sysid;
 
 	if (ftype == F_UNLCK)
 		error = VOP_ADVLOCK(vp, (caddr_t)td->td_proc, F_UNLCK, &fl,
 		    (F_POSIX | F_REMOTE));
 	else
 		error = VOP_ADVLOCK(vp, (caddr_t)td->td_proc, F_SETLK, &fl,
 		    (F_POSIX | F_REMOTE));
 
 out:
 	NFSEXITCODE(error);
 	return (error);
 }
 
 /*
  * Check the nfsv4 root exports.
  */
 int
 nfsvno_v4rootexport(struct nfsrv_descript *nd)
 {
 	struct ucred *credanon;
 	int exflags, error = 0, numsecflavor, *secflavors, i;
 
 	error = vfs_stdcheckexp(&nfsv4root_mnt, nd->nd_nam, &exflags,
 	    &credanon, &numsecflavor, &secflavors);
 	if (error) {
 		error = NFSERR_PROGUNAVAIL;
 		goto out;
 	}
 	if (credanon != NULL)
 		crfree(credanon);
 	for (i = 0; i < numsecflavor; i++) {
 		if (secflavors[i] == AUTH_SYS)
 			nd->nd_flag |= ND_EXAUTHSYS;
 		else if (secflavors[i] == RPCSEC_GSS_KRB5)
 			nd->nd_flag |= ND_EXGSS;
 		else if (secflavors[i] == RPCSEC_GSS_KRB5I)
 			nd->nd_flag |= ND_EXGSSINTEGRITY;
 		else if (secflavors[i] == RPCSEC_GSS_KRB5P)
 			nd->nd_flag |= ND_EXGSSPRIVACY;
 	}
 
 out:
 	NFSEXITCODE(error);
 	return (error);
 }
 
 /*
  * Nfs server pseudo system call for the nfsd's
  */
 /*
  * MPSAFE
  */
 static int
 nfssvc_nfsd(struct thread *td, struct nfssvc_args *uap)
 {
 	struct file *fp;
 	struct nfsd_addsock_args sockarg;
 	struct nfsd_nfsd_args nfsdarg;
 	cap_rights_t rights;
 	int error;
 
 	if (uap->flag & NFSSVC_NFSDADDSOCK) {
 		error = copyin(uap->argp, (caddr_t)&sockarg, sizeof (sockarg));
 		if (error)
 			goto out;
 		/*
 		 * Since we don't know what rights might be required,
 		 * pretend that we need them all. It is better to be too
 		 * careful than too reckless.
 		 */
 		error = fget(td, sockarg.sock,
 		    cap_rights_init(&rights, CAP_SOCK_SERVER), &fp);
 		if (error != 0)
 			goto out;
 		if (fp->f_type != DTYPE_SOCKET) {
 			fdrop(fp, td);
 			error = EPERM;
 			goto out;
 		}
 		error = nfsrvd_addsock(fp);
 		fdrop(fp, td);
 	} else if (uap->flag & NFSSVC_NFSDNFSD) {
 		if (uap->argp == NULL) {
 			error = EINVAL;
 			goto out;
 		}
 		error = copyin(uap->argp, (caddr_t)&nfsdarg,
 		    sizeof (nfsdarg));
 		if (error)
 			goto out;
 		error = nfsrvd_nfsd(td, &nfsdarg);
 	} else {
 		error = nfssvc_srvcall(td, uap, td->td_ucred);
 	}
 
 out:
 	NFSEXITCODE(error);
 	return (error);
 }
 
 static int
 nfssvc_srvcall(struct thread *p, struct nfssvc_args *uap, struct ucred *cred)
 {
 	struct nfsex_args export;
 	struct file *fp = NULL;
 	int stablefd, len;
 	struct nfsd_clid adminrevoke;
 	struct nfsd_dumplist dumplist;
 	struct nfsd_dumpclients *dumpclients;
 	struct nfsd_dumplocklist dumplocklist;
 	struct nfsd_dumplocks *dumplocks;
 	struct nameidata nd;
 	vnode_t vp;
 	int error = EINVAL, igotlock;
 	struct proc *procp;
 	static int suspend_nfsd = 0;
 
 	if (uap->flag & NFSSVC_PUBLICFH) {
 		NFSBZERO((caddr_t)&nfs_pubfh.nfsrvfh_data,
 		    sizeof (fhandle_t));
 		error = copyin(uap->argp,
 		    &nfs_pubfh.nfsrvfh_data, sizeof (fhandle_t));
 		if (!error)
 			nfs_pubfhset = 1;
 	} else if (uap->flag & NFSSVC_V4ROOTEXPORT) {
 		error = copyin(uap->argp,(caddr_t)&export,
 		    sizeof (struct nfsex_args));
 		if (!error)
 			error = nfsrv_v4rootexport(&export, cred, p);
 	} else if (uap->flag & NFSSVC_NOPUBLICFH) {
 		nfs_pubfhset = 0;
 		error = 0;
 	} else if (uap->flag & NFSSVC_STABLERESTART) {
 		error = copyin(uap->argp, (caddr_t)&stablefd,
 		    sizeof (int));
 		if (!error)
 			error = fp_getfvp(p, stablefd, &fp, &vp);
 		if (!error && (NFSFPFLAG(fp) & (FREAD | FWRITE)) != (FREAD | FWRITE))
 			error = EBADF;
 		if (!error && newnfs_numnfsd != 0)
 			error = EPERM;
 		if (!error) {
 			nfsrv_stablefirst.nsf_fp = fp;
 			nfsrv_setupstable(p);
 		}
 	} else if (uap->flag & NFSSVC_ADMINREVOKE) {
 		error = copyin(uap->argp, (caddr_t)&adminrevoke,
 		    sizeof (struct nfsd_clid));
 		if (!error)
 			error = nfsrv_adminrevoke(&adminrevoke, p);
 	} else if (uap->flag & NFSSVC_DUMPCLIENTS) {
 		error = copyin(uap->argp, (caddr_t)&dumplist,
 		    sizeof (struct nfsd_dumplist));
 		if (!error && (dumplist.ndl_size < 1 ||
 			dumplist.ndl_size > NFSRV_MAXDUMPLIST))
 			error = EPERM;
 		if (!error) {
 		    len = sizeof (struct nfsd_dumpclients) * dumplist.ndl_size;
 		    dumpclients = (struct nfsd_dumpclients *)malloc(len,
 			M_TEMP, M_WAITOK);
 		    nfsrv_dumpclients(dumpclients, dumplist.ndl_size);
 		    error = copyout(dumpclients,
 			CAST_USER_ADDR_T(dumplist.ndl_list), len);
 		    free((caddr_t)dumpclients, M_TEMP);
 		}
 	} else if (uap->flag & NFSSVC_DUMPLOCKS) {
 		error = copyin(uap->argp, (caddr_t)&dumplocklist,
 		    sizeof (struct nfsd_dumplocklist));
 		if (!error && (dumplocklist.ndllck_size < 1 ||
 			dumplocklist.ndllck_size > NFSRV_MAXDUMPLIST))
 			error = EPERM;
 		if (!error)
 			error = nfsrv_lookupfilename(&nd,
 				dumplocklist.ndllck_fname, p);
 		if (!error) {
 			len = sizeof (struct nfsd_dumplocks) *
 				dumplocklist.ndllck_size;
 			dumplocks = (struct nfsd_dumplocks *)malloc(len,
 				M_TEMP, M_WAITOK);
 			nfsrv_dumplocks(nd.ni_vp, dumplocks,
 			    dumplocklist.ndllck_size, p);
 			vput(nd.ni_vp);
 			error = copyout(dumplocks,
 			    CAST_USER_ADDR_T(dumplocklist.ndllck_list), len);
 			free((caddr_t)dumplocks, M_TEMP);
 		}
 	} else if (uap->flag & NFSSVC_BACKUPSTABLE) {
 		procp = p->td_proc;
 		PROC_LOCK(procp);
 		nfsd_master_pid = procp->p_pid;
 		bcopy(procp->p_comm, nfsd_master_comm, MAXCOMLEN + 1);
 		nfsd_master_start = procp->p_stats->p_start;
 		nfsd_master_proc = procp;
 		PROC_UNLOCK(procp);
 	} else if ((uap->flag & NFSSVC_SUSPENDNFSD) != 0) {
 		NFSLOCKV4ROOTMUTEX();
 		if (suspend_nfsd == 0) {
 			/* Lock out all nfsd threads */
 			do {
 				igotlock = nfsv4_lock(&nfsd_suspend_lock, 1,
 				    NULL, NFSV4ROOTLOCKMUTEXPTR, NULL);
 			} while (igotlock == 0 && suspend_nfsd == 0);
 			suspend_nfsd = 1;
 		}
 		NFSUNLOCKV4ROOTMUTEX();
 		error = 0;
 	} else if ((uap->flag & NFSSVC_RESUMENFSD) != 0) {
 		NFSLOCKV4ROOTMUTEX();
 		if (suspend_nfsd != 0) {
 			nfsv4_unlock(&nfsd_suspend_lock, 0);
 			suspend_nfsd = 0;
 		}
 		NFSUNLOCKV4ROOTMUTEX();
 		error = 0;
 	}
 
 	NFSEXITCODE(error);
 	return (error);
 }
 
 /*
  * Check exports.
  * Returns 0 if ok, 1 otherwise.
  */
 int
 nfsvno_testexp(struct nfsrv_descript *nd, struct nfsexstuff *exp)
 {
 	int i;
 
 	/*
 	 * This seems odd, but allow the case where the security flavor
 	 * list is empty. This happens when NFSv4 is traversing non-exported
 	 * file systems. Exported file systems should always have a non-empty
 	 * security flavor list.
 	 */
 	if (exp->nes_numsecflavor == 0)
 		return (0);
 
 	for (i = 0; i < exp->nes_numsecflavor; i++) {
 		/*
 		 * The tests for privacy and integrity must be first,
 		 * since ND_GSS is set for everything but AUTH_SYS.
 		 */
 		if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5P &&
 		    (nd->nd_flag & ND_GSSPRIVACY))
 			return (0);
 		if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5I &&
 		    (nd->nd_flag & ND_GSSINTEGRITY))
 			return (0);
 		if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5 &&
 		    (nd->nd_flag & ND_GSS))
 			return (0);
 		if (exp->nes_secflavors[i] == AUTH_SYS &&
 		    (nd->nd_flag & ND_GSS) == 0)
 			return (0);
 	}
 	return (1);
 }
 
 /*
  * Calculate a hash value for the fid in a file handle.
  */
 uint32_t
 nfsrv_hashfh(fhandle_t *fhp)
 {
 	uint32_t hashval;
 
 	hashval = hash32_buf(&fhp->fh_fid, sizeof(struct fid), 0);
 	return (hashval);
 }
 
 /*
  * Calculate a hash value for the sessionid.
  */
 uint32_t
 nfsrv_hashsessionid(uint8_t *sessionid)
 {
 	uint32_t hashval;
 
 	hashval = hash32_buf(sessionid, NFSX_V4SESSIONID, 0);
 	return (hashval);
 }
 
 /*
  * Signal the userland master nfsd to backup the stable restart file.
  */
 void
 nfsrv_backupstable(void)
 {
 	struct proc *procp;
 
 	if (nfsd_master_proc != NULL) {
 		procp = pfind(nfsd_master_pid);
 		/* Try to make sure it is the correct process. */
 		if (procp == nfsd_master_proc &&
 		    procp->p_stats->p_start.tv_sec ==
 		    nfsd_master_start.tv_sec &&
 		    procp->p_stats->p_start.tv_usec ==
 		    nfsd_master_start.tv_usec &&
 		    strcmp(procp->p_comm, nfsd_master_comm) == 0)
 			kern_psignal(procp, SIGUSR2);
 		else
 			nfsd_master_proc = NULL;
 
 		if (procp != NULL)
 			PROC_UNLOCK(procp);
 	}
 }
 
 extern int (*nfsd_call_nfsd)(struct thread *, struct nfssvc_args *);
 
 /*
  * Called once to initialize data structures...
  */
 static int
 nfsd_modevent(module_t mod, int type, void *data)
 {
 	int error = 0, i;
 	static int loaded = 0;
 
 	switch (type) {
 	case MOD_LOAD:
 		if (loaded)
 			goto out;
 		newnfs_portinit();
 		for (i = 0; i < NFSRVCACHE_HASHSIZE; i++) {
 			mtx_init(&nfsrchash_table[i].mtx, "nfsrtc", NULL,
 			    MTX_DEF);
 			mtx_init(&nfsrcahash_table[i].mtx, "nfsrtca", NULL,
 			    MTX_DEF);
 		}
 		mtx_init(&nfsrc_udpmtx, "nfsuc", NULL, MTX_DEF);
 		mtx_init(&nfs_v4root_mutex, "nfs4rt", NULL, MTX_DEF);
 		mtx_init(&nfsv4root_mnt.mnt_mtx, "nfs4mnt", NULL, MTX_DEF);
 		lockinit(&nfsv4root_mnt.mnt_explock, PVFS, "explock", 0, 0);
 		nfsrvd_initcache();
 		nfsd_init();
 		NFSD_LOCK();
 		nfsrvd_init(0);
 		NFSD_UNLOCK();
 		nfsd_mntinit();
 #ifdef VV_DISABLEDELEG
 		vn_deleg_ops.vndeleg_recall = nfsd_recalldelegation;
 		vn_deleg_ops.vndeleg_disable = nfsd_disabledelegation;
 #endif
 		nfsd_call_servertimer = nfsrv_servertimer;
 		nfsd_call_nfsd = nfssvc_nfsd;
 		loaded = 1;
 		break;
 
 	case MOD_UNLOAD:
 		if (newnfs_numnfsd != 0) {
 			error = EBUSY;
 			break;
 		}
 
 #ifdef VV_DISABLEDELEG
 		vn_deleg_ops.vndeleg_recall = NULL;
 		vn_deleg_ops.vndeleg_disable = NULL;
 #endif
 		nfsd_call_servertimer = NULL;
 		nfsd_call_nfsd = NULL;
 
 		/* Clean out all NFSv4 state. */
 		nfsrv_throwawayallstate(curthread);
 
 		/* Clean the NFS server reply cache */
 		nfsrvd_cleancache();
 
 		/* Free up the krpc server pool. */
 		if (nfsrvd_pool != NULL)
 			svcpool_destroy(nfsrvd_pool);
 
 		/* and get rid of the locks */
 		for (i = 0; i < NFSRVCACHE_HASHSIZE; i++) {
 			mtx_destroy(&nfsrchash_table[i].mtx);
 			mtx_destroy(&nfsrcahash_table[i].mtx);
 		}
 		mtx_destroy(&nfsrc_udpmtx);
 		mtx_destroy(&nfs_v4root_mutex);
 		mtx_destroy(&nfsv4root_mnt.mnt_mtx);
 		for (i = 0; i < nfsrv_sessionhashsize; i++)
 			mtx_destroy(&nfssessionhash[i].mtx);
 		lockdestroy(&nfsv4root_mnt.mnt_explock);
 		free(nfsclienthash, M_NFSDCLIENT);
 		free(nfslockhash, M_NFSDLOCKFILE);
 		free(nfssessionhash, M_NFSDSESSION);
 		loaded = 0;
 		break;
 	default:
 		error = EOPNOTSUPP;
 		break;
 	}
 
 out:
 	NFSEXITCODE(error);
 	return (error);
 }
 static moduledata_t nfsd_mod = {
 	"nfsd",
 	nfsd_modevent,
 	NULL,
 };
 DECLARE_MODULE(nfsd, nfsd_mod, SI_SUB_VFS, SI_ORDER_ANY);
 
 /* So that loader and kldload(2) can find us, wherever we are.. */
 MODULE_VERSION(nfsd, 1);
 MODULE_DEPEND(nfsd, nfscommon, 1, 1, 1);
 MODULE_DEPEND(nfsd, nfslock, 1, 1, 1);
 MODULE_DEPEND(nfsd, nfslockd, 1, 1, 1);
 MODULE_DEPEND(nfsd, krpc, 1, 1, 1);
 MODULE_DEPEND(nfsd, nfssvc, 1, 1, 1);
 
Index: stable/11
===================================================================
--- stable/11	(revision 312419)
+++ stable/11	(revision 312420)

Property changes on: stable/11
___________________________________________________________________
Modified: svn:mergeinfo
## -0,0 +0,1 ##
   Merged /head:r311122