text: /*	$OpenBSD: nfs_subs.c,v 1.131 2016/04/29 14:40:36 beck Exp $	*/
  /*	$NetBSD: nfs_subs.c,v 1.27.4.3 1996/07/08 20:34:24 jtc Exp $	*/
  
  /*
   * Copyright (c) 1989, 1993
   *	The Regents of the University of California.  All rights reserved.
   *
   * This code is derived from software contributed to Berkeley by
   * Rick Macklem at The University of Guelph.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   *	@(#)nfs_subs.c	8.8 (Berkeley) 5/22/95
   */
  
  
  /*
   * These functions support the macros and help fiddle mbuf chains for
   * the nfs op functions. They do things like create the rpc header and
   * copy data between mbuf chains and uio lists.
   */
  #include <sys/param.h>
  #include <sys/systm.h>
  #include <sys/kernel.h>
  #include <sys/mount.h>
  #include <sys/vnode.h>
  #include <sys/namei.h>
  #include <sys/mbuf.h>
  #include <sys/socket.h>
  #include <sys/socketvar.h>
  #include <sys/stat.h>
  #include <sys/pool.h>
  #include <sys/time.h>
  
  #include <nfs/rpcv2.h>
  #include <nfs/nfsproto.h>
  #include <nfs/nfsnode.h>
  #include <nfs/nfs.h>
  #include <nfs/xdr_subs.h>
  #include <nfs/nfsm_subs.h>
  #include <nfs/nfsmount.h>
  #include <nfs/nfs_var.h>
  
  #include <uvm/uvm_extern.h>
  
  #include <netinet/in.h>
  
  #include <crypto/idgen.h>
  
  int	nfs_attrtimeo(struct nfsnode *np);
  
  /*
   * Data items converted to xdr at startup, since they are constant
   * This is kinda hokey, but may save a little time doing byte swaps
   */
  u_int32_t nfs_xdrneg1;
  u_int32_t rpc_call, rpc_vers, rpc_reply, rpc_msgdenied, rpc_autherr,
  	rpc_mismatch, rpc_auth_unix, rpc_msgaccepted;
  u_int32_t nfs_prog, nfs_true, nfs_false;
  
  /* And other global data */
  nfstype nfsv2_type[9] = { NFNON, NFREG, NFDIR, NFBLK, NFCHR, NFLNK, NFNON,
  		      NFCHR, NFNON };
  nfstype nfsv3_type[9] = { NFNON, NFREG, NFDIR, NFBLK, NFCHR, NFLNK, NFSOCK,
  		      NFFIFO, NFNON };
  enum vtype nv2tov_type[8] = { VNON, VREG, VDIR, VBLK, VCHR, VLNK, VNON, VNON };
  enum vtype nv3tov_type[8]={ VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VFIFO };
  int nfs_ticks;
  struct nfsstats nfsstats;
  
  /*
   * Mapping of old NFS Version 2 RPC numbers to generic numbers.
   */
  int nfsv3_procid[NFS_NPROCS] = {
  	NFSPROC_NULL,
  	NFSPROC_GETATTR,
  	NFSPROC_SETATTR,
  	NFSPROC_NOOP,
  	NFSPROC_LOOKUP,
  	NFSPROC_READLINK,
  	NFSPROC_READ,
  	NFSPROC_NOOP,
  	NFSPROC_WRITE,
  	NFSPROC_CREATE,
  	NFSPROC_REMOVE,
  	NFSPROC_RENAME,
  	NFSPROC_LINK,
  	NFSPROC_SYMLINK,
  	NFSPROC_MKDIR,
  	NFSPROC_RMDIR,
  	NFSPROC_READDIR,
  	NFSPROC_FSSTAT,
  	NFSPROC_NOOP,
  	NFSPROC_NOOP,
  	NFSPROC_NOOP,
  	NFSPROC_NOOP,
  	NFSPROC_NOOP
  };
  
  /*
   * and the reverse mapping from generic to Version 2 procedure numbers
   */
  int nfsv2_procid[NFS_NPROCS] = {
  	NFSV2PROC_NULL,
  	NFSV2PROC_GETATTR,
  	NFSV2PROC_SETATTR,
  	NFSV2PROC_LOOKUP,
  	NFSV2PROC_NOOP,
  	NFSV2PROC_READLINK,
  	NFSV2PROC_READ,
  	NFSV2PROC_WRITE,
  	NFSV2PROC_CREATE,
  	NFSV2PROC_MKDIR,
  	NFSV2PROC_SYMLINK,
  	NFSV2PROC_CREATE,
  	NFSV2PROC_REMOVE,
  	NFSV2PROC_RMDIR,
  	NFSV2PROC_RENAME,
  	NFSV2PROC_LINK,
  	NFSV2PROC_READDIR,
  	NFSV2PROC_NOOP,
  	NFSV2PROC_STATFS,
  	NFSV2PROC_NOOP,
  	NFSV2PROC_NOOP,
  	NFSV2PROC_NOOP,
  	NFSV2PROC_NOOP
  };
  
  /*
   * Maps errno values to nfs error numbers.
   * Use NFSERR_IO as the catch all for ones not specifically defined in
   * RFC 1094.
   */
  static u_char nfsrv_v2errmap[] = {
    NFSERR_PERM,	NFSERR_NOENT,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,
    NFSERR_NXIO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,
    NFSERR_IO,	NFSERR_IO,	NFSERR_ACCES,	NFSERR_IO,	NFSERR_IO,
    NFSERR_IO,	NFSERR_EXIST,	NFSERR_IO,	NFSERR_NODEV,	NFSERR_NOTDIR,
    NFSERR_ISDIR,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,
    NFSERR_IO,	NFSERR_FBIG,	NFSERR_NOSPC,	NFSERR_IO,	NFSERR_ROFS,
    NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,
    NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,
    NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,
    NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,
    NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,
    NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,
    NFSERR_IO,	NFSERR_IO,	NFSERR_NAMETOL,	NFSERR_IO,	NFSERR_IO,
    NFSERR_NOTEMPTY, NFSERR_IO,	NFSERR_IO,	NFSERR_DQUOT,	NFSERR_STALE
    /* Everything after this maps to NFSERR_IO, so far */
  };
  
  /*
   * Maps errno values to nfs error numbers.
   * Although it is not obvious whether or not NFS clients really care if
   * a returned error value is in the specified list for the procedure, the
   * safest thing to do is filter them appropriately. For Version 2, the
   * X/Open XNFS document is the only specification that defines error values
   * for each RPC (The RFC simply lists all possible error values for all RPCs),
   * so I have decided to not do this for Version 2.
   * The first entry is the default error return and the rest are the valid
   * errors for that RPC in increasing numeric order.
   */
  static short nfsv3err_null[] = {
  	0,
  	0,
  };
  
  static short nfsv3err_getattr[] = {
  	NFSERR_IO,
  	NFSERR_IO,
  	NFSERR_STALE,
  	NFSERR_BADHANDLE,
  	NFSERR_SERVERFAULT,
  	0,
  };
  
  static short nfsv3err_setattr[] = {
  	NFSERR_IO,
  	NFSERR_PERM,
  	NFSERR_IO,
  	NFSERR_ACCES,
  	NFSERR_INVAL,
  	NFSERR_NOSPC,
  	NFSERR_ROFS,
  	NFSERR_DQUOT,
  	NFSERR_STALE,
  	NFSERR_BADHANDLE,
  	NFSERR_NOT_SYNC,
  	NFSERR_SERVERFAULT,
  	0,
  };
  
  static short nfsv3err_lookup[] = {
  	NFSERR_IO,
  	NFSERR_NOENT,
  	NFSERR_IO,
  	NFSERR_ACCES,
  	NFSERR_NOTDIR,
  	NFSERR_NAMETOL,
  	NFSERR_STALE,
  	NFSERR_BADHANDLE,
  	NFSERR_SERVERFAULT,
  	0,
  };
  
  static short nfsv3err_access[] = {
  	NFSERR_IO,
  	NFSERR_IO,
  	NFSERR_STALE,
  	NFSERR_BADHANDLE,
  	NFSERR_SERVERFAULT,
  	0,
  };
  
  static short nfsv3err_readlink[] = {
  	NFSERR_IO,
  	NFSERR_IO,
  	NFSERR_ACCES,
  	NFSERR_INVAL,
  	NFSERR_STALE,
  	NFSERR_BADHANDLE,
  	NFSERR_NOTSUPP,
  	NFSERR_SERVERFAULT,
  	0,
  };
  
  static short nfsv3err_read[] = {
  	NFSERR_IO,
  	NFSERR_IO,
  	NFSERR_NXIO,
  	NFSERR_ACCES,
  	NFSERR_INVAL,
  	NFSERR_STALE,
  	NFSERR_BADHANDLE,
  	NFSERR_SERVERFAULT,
  	0,
  };
  
  static short nfsv3err_write[] = {
  	NFSERR_IO,
  	NFSERR_IO,
  	NFSERR_ACCES,
  	NFSERR_INVAL,
  	NFSERR_FBIG,
  	NFSERR_NOSPC,
  	NFSERR_ROFS,
  	NFSERR_DQUOT,
  	NFSERR_STALE,
  	NFSERR_BADHANDLE,
  	NFSERR_SERVERFAULT,
  	0,
  };
  
  static short nfsv3err_create[] = {
  	NFSERR_IO,
  	NFSERR_IO,
  	NFSERR_ACCES,
  	NFSERR_EXIST,
  	NFSERR_NOTDIR,
  	NFSERR_NOSPC,
  	NFSERR_ROFS,
  	NFSERR_NAMETOL,
  	NFSERR_DQUOT,
  	NFSERR_STALE,
  	NFSERR_BADHANDLE,
  	NFSERR_NOTSUPP,
  	NFSERR_SERVERFAULT,
  	0,
  };
  
  static short nfsv3err_mkdir[] = {
  	NFSERR_IO,
  	NFSERR_IO,
  	NFSERR_ACCES,
  	NFSERR_EXIST,
  	NFSERR_NOTDIR,
  	NFSERR_NOSPC,
  	NFSERR_ROFS,
  	NFSERR_NAMETOL,
  	NFSERR_DQUOT,
  	NFSERR_STALE,
  	NFSERR_BADHANDLE,
  	NFSERR_NOTSUPP,
  	NFSERR_SERVERFAULT,
  	0,
  };
  
  static short nfsv3err_symlink[] = {
  	NFSERR_IO,
  	NFSERR_IO,
  	NFSERR_ACCES,
  	NFSERR_EXIST,
  	NFSERR_NOTDIR,
  	NFSERR_NOSPC,
  	NFSERR_ROFS,
  	NFSERR_NAMETOL,
  	NFSERR_DQUOT,
  	NFSERR_STALE,
  	NFSERR_BADHANDLE,
  	NFSERR_NOTSUPP,
  	NFSERR_SERVERFAULT,
  	0,
  };
  
  static short nfsv3err_mknod[] = {
  	NFSERR_IO,
  	NFSERR_IO,
  	NFSERR_ACCES,
  	NFSERR_EXIST,
  	NFSERR_NOTDIR,
  	NFSERR_NOSPC,
  	NFSERR_ROFS,
  	NFSERR_NAMETOL,
  	NFSERR_DQUOT,
  	NFSERR_STALE,
  	NFSERR_BADHANDLE,
  	NFSERR_NOTSUPP,
  	NFSERR_SERVERFAULT,
  	NFSERR_BADTYPE,
  	0,
  };
  
  static short nfsv3err_remove[] = {
  	NFSERR_IO,
  	NFSERR_NOENT,
  	NFSERR_IO,
  	NFSERR_ACCES,
  	NFSERR_NOTDIR,
  	NFSERR_ROFS,
  	NFSERR_NAMETOL,
  	NFSERR_STALE,
  	NFSERR_BADHANDLE,
  	NFSERR_SERVERFAULT,
  	0,
  };
  
  static short nfsv3err_rmdir[] = {
  	NFSERR_IO,
  	NFSERR_NOENT,
  	NFSERR_IO,
  	NFSERR_ACCES,
  	NFSERR_EXIST,
  	NFSERR_NOTDIR,
  	NFSERR_INVAL,
  	NFSERR_ROFS,
  	NFSERR_NAMETOL,
  	NFSERR_NOTEMPTY,
  	NFSERR_STALE,
  	NFSERR_BADHANDLE,
  	NFSERR_NOTSUPP,
  	NFSERR_SERVERFAULT,
  	0,
  };
  
  static short nfsv3err_rename[] = {
  	NFSERR_IO,
  	NFSERR_NOENT,
  	NFSERR_IO,
  	NFSERR_ACCES,
  	NFSERR_EXIST,
  	NFSERR_XDEV,
  	NFSERR_NOTDIR,
  	NFSERR_ISDIR,
  	NFSERR_INVAL,
  	NFSERR_NOSPC,
  	NFSERR_ROFS,
  	NFSERR_MLINK,
  	NFSERR_NAMETOL,
  	NFSERR_NOTEMPTY,
  	NFSERR_DQUOT,
  	NFSERR_STALE,
  	NFSERR_BADHANDLE,
  	NFSERR_NOTSUPP,
  	NFSERR_SERVERFAULT,
  	0,
  };
  
  static short nfsv3err_link[] = {
  	NFSERR_IO,
  	NFSERR_IO,
  	NFSERR_ACCES,
  	NFSERR_EXIST,
  	NFSERR_XDEV,
  	NFSERR_NOTDIR,
  	NFSERR_INVAL,
  	NFSERR_NOSPC,
  	NFSERR_ROFS,
  	NFSERR_MLINK,
  	NFSERR_NAMETOL,
  	NFSERR_DQUOT,
  	NFSERR_STALE,
  	NFSERR_BADHANDLE,
  	NFSERR_NOTSUPP,
  	NFSERR_SERVERFAULT,
  	0,
  };
  
  static short nfsv3err_readdir[] = {
  	NFSERR_IO,
  	NFSERR_IO,
  	NFSERR_ACCES,
  	NFSERR_NOTDIR,
  	NFSERR_STALE,
  	NFSERR_BADHANDLE,
  	NFSERR_BAD_COOKIE,
  	NFSERR_TOOSMALL,
  	NFSERR_SERVERFAULT,
  	0,
  };
  
  static short nfsv3err_readdirplus[] = {
  	NFSERR_IO,
  	NFSERR_IO,
  	NFSERR_ACCES,
  	NFSERR_NOTDIR,
  	NFSERR_STALE,
  	NFSERR_BADHANDLE,
  	NFSERR_BAD_COOKIE,
  	NFSERR_NOTSUPP,
  	NFSERR_TOOSMALL,
  	NFSERR_SERVERFAULT,
  	0,
  };
  
  static short nfsv3err_fsstat[] = {
  	NFSERR_IO,
  	NFSERR_IO,
  	NFSERR_STALE,
  	NFSERR_BADHANDLE,
  	NFSERR_SERVERFAULT,
  	0,
  };
  
  static short nfsv3err_fsinfo[] = {
  	NFSERR_STALE,
  	NFSERR_STALE,
  	NFSERR_BADHANDLE,
  	NFSERR_SERVERFAULT,
  	0,
  };
  
  static short nfsv3err_pathconf[] = {
  	NFSERR_STALE,
  	NFSERR_STALE,
  	NFSERR_BADHANDLE,
  	NFSERR_SERVERFAULT,
  	0,
  };
  
  static short nfsv3err_commit[] = {
  	NFSERR_IO,
  	NFSERR_IO,
  	NFSERR_STALE,
  	NFSERR_BADHANDLE,
  	NFSERR_SERVERFAULT,
  	0,
  };
  
  static short *nfsrv_v3errmap[] = {
  	nfsv3err_null,
  	nfsv3err_getattr,
  	nfsv3err_setattr,
  	nfsv3err_lookup,
  	nfsv3err_access,
  	nfsv3err_readlink,
  	nfsv3err_read,
  	nfsv3err_write,
  	nfsv3err_create,
  	nfsv3err_mkdir,
  	nfsv3err_symlink,
  	nfsv3err_mknod,
  	nfsv3err_remove,
  	nfsv3err_rmdir,
  	nfsv3err_rename,
  	nfsv3err_link,
  	nfsv3err_readdir,
  	nfsv3err_readdirplus,
  	nfsv3err_fsstat,
  	nfsv3err_fsinfo,
  	nfsv3err_pathconf,
  	nfsv3err_commit,
  };
  
  struct pool nfsreqpl;
  
  /*
   * Create the header for an rpc request packet
   * The hsiz is the size of the rest of the nfs request header.
   * (just used to decide if a cluster is a good idea)
   */
  struct mbuf *
  nfsm_reqhead(int hsiz)
  {
  	struct mbuf *mb;
  
  	MGET(mb, M_WAIT, MT_DATA);
  	if (hsiz > MLEN)
  		MCLGET(mb, M_WAIT);
  	mb->m_len = 0;
  	
  	/* Finally, return values */
  	return (mb);
  }
  
  /*
   * Return an unpredictable XID in XDR form.
   */
  u_int32_t
  nfs_get_xid(void)
  {
  	static struct idgen32_ctx nfs_xid_ctx;
  	static int called = 0;
  
  	if (!called) {
  		called = 1;
  		idgen32_init(&nfs_xid_ctx);
  	}
  	return (txdr_unsigned(idgen32(&nfs_xid_ctx)));
  }
  
  /*
   * Build the RPC header and fill in the authorization info.
   * Right now we are pretty centric around RPCAUTH_UNIX, in the
   * future, this function will need some love to be able to handle
   * other authorization methods, such as Kerberos.
   */
  void
  nfsm_rpchead(struct nfsreq *req, struct ucred *cr, int auth_type)
  {
  	struct mbuf	*mb;
  	u_int32_t	*tl;
  	int		i, authsiz, auth_len, ngroups;
  
  	KASSERT(auth_type == RPCAUTH_UNIX);
  
  	/*
  	 * RPCAUTH_UNIX fits in an hdr mbuf, in the future other
  	 * authorization methods need to figure out their own sizes
  	 * and allocate and chain mbuf's accorindgly.
  	 */
  	mb = req->r_mreq;
  
  	/*
  	 * We need to start out by finding how big the authorization cred
  	 * and verifer are for the auth_type, to be able to correctly
  	 * align the mbuf header/chain.
  	 */
  	switch (auth_type) {
  	case RPCAUTH_UNIX:
  		/*
  		 * In the RPCAUTH_UNIX case, the size is the static
  		 * part as shown in RFC1831 + the number of groups,
  		 * RPCAUTH_UNIX has a zero verifer.
  		 */
  		if (cr->cr_ngroups > req->r_nmp->nm_numgrps)
  			ngroups = req->r_nmp->nm_numgrps;
  		else
  			ngroups = cr->cr_ngroups;
  
  		auth_len = (ngroups << 2) + 5 * NFSX_UNSIGNED;
  		authsiz = nfsm_rndup(auth_len);
  		/* The authorization size + the size of the static part */
  		MH_ALIGN(mb, authsiz + 10 * NFSX_UNSIGNED);
  		break;
  	}
  
  	mb->m_len = 0;
  
  	/* First the RPC header. */
  	tl = nfsm_build(&mb, 6 * NFSX_UNSIGNED);
  
  	/* Get a new (non-zero) xid */
  	*tl++ = req->r_xid = nfs_get_xid();
  	*tl++ = rpc_call;
  	*tl++ = rpc_vers;
  	*tl++ = nfs_prog;
  	if (ISSET(req->r_nmp->nm_flag, NFSMNT_NFSV3)) {
  		*tl++ = txdr_unsigned(NFS_VER3);
  		*tl = txdr_unsigned(req->r_procnum);
  	} else {
  		*tl++ = txdr_unsigned(NFS_VER2);
  		*tl = txdr_unsigned(nfsv2_procid[req->r_procnum]);
  	}
  
  	/* The Authorization cred and its verifier */
  	switch (auth_type) {
  	case RPCAUTH_UNIX:
  		tl = nfsm_build(&mb, auth_len + 4 * NFSX_UNSIGNED);
  		*tl++ = txdr_unsigned(RPCAUTH_UNIX);
  		*tl++ = txdr_unsigned(authsiz);
  
  		/* The authorization cred */
  		*tl++ = 0;		/* stamp */
  		*tl++ = 0;		/* NULL hostname */
  		*tl++ = txdr_unsigned(cr->cr_uid);
  		*tl++ = txdr_unsigned(cr->cr_gid);
  		*tl++ = txdr_unsigned(ngroups);
  		for (i = 0; i < ngroups; i++)
  			*tl++ = txdr_unsigned(cr->cr_groups[i]);
  		/* The authorization verifier */
  		*tl++ = txdr_unsigned(RPCAUTH_NULL);
  		*tl = 0;
  		break;
  	}
  
  	mb->m_pkthdr.len += authsiz + 10 * NFSX_UNSIGNED;
  	mb->m_pkthdr.ph_ifidx = 0;
  }
  
  /*
   * copies mbuf chain to the uio scatter/gather list
   */
  int
  nfsm_mbuftouio(struct mbuf **mrep, struct uio *uiop, int siz, caddr_t *dpos)
  {
  	char *mbufcp, *uiocp;
  	int xfer, left, len;
  	struct mbuf *mp;
  	long uiosiz, rem;
  	int error = 0;
  
  	mp = *mrep;
  	mbufcp = *dpos;
  	len = mtod(mp, caddr_t)+mp->m_len-mbufcp;
  	rem = nfsm_padlen(siz);
  	while (siz > 0) {
  		if (uiop->uio_iovcnt <= 0 || uiop->uio_iov == NULL)
  			return (EFBIG);
  		left = uiop->uio_iov->iov_len;
  		uiocp = uiop->uio_iov->iov_base;
  		if (left > siz)
  			left = siz;
  		uiosiz = left;
  		while (left > 0) {
  			while (len == 0) {
  				mp = mp->m_next;
  				if (mp == NULL)
  					return (EBADRPC);
  				mbufcp = mtod(mp, caddr_t);
  				len = mp->m_len;
  			}
  			xfer = (left > len) ? len : left;
  			if (uiop->uio_segflg == UIO_SYSSPACE)
  				memcpy(uiocp, mbufcp, xfer);
  			else
  				copyout(mbufcp, uiocp, xfer);
  			left -= xfer;
  			len -= xfer;
  			mbufcp += xfer;
  			uiocp += xfer;
  			uiop->uio_offset += xfer;
  			uiop->uio_resid -= xfer;
  		}
  		if (uiop->uio_iov->iov_len <= siz) {
  			uiop->uio_iovcnt--;
  			uiop->uio_iov++;
  		} else {
  			uiop->uio_iov->iov_base =
  			    (char *)uiop->uio_iov->iov_base + uiosiz;
  			uiop->uio_iov->iov_len -= uiosiz;
  		}
  		siz -= uiosiz;
  	}
  	*dpos = mbufcp;
  	*mrep = mp;
  	if (rem > 0) {
  		if (len < rem)
  			error = nfs_adv(mrep, dpos, rem, len);
  		else
  			*dpos += rem;
  	}
  	return (error);
  }
  
  /*
   * Copy a uio scatter/gather list to an mbuf chain.
   */
  void
  nfsm_uiotombuf(struct mbuf **mp, struct uio *uiop, size_t len)
  {
  	struct mbuf *mb, *mb2;
  	size_t xfer, pad;
  
  	mb = *mp;
  
  	pad = nfsm_padlen(len);
  
  	/* XXX -- the following should be done by the caller */
  	uiop->uio_resid = len;
  	uiop->uio_rw = UIO_WRITE;
  
  	while (len) {
  		xfer = ulmin(len, M_TRAILINGSPACE(mb));
  		uiomove(mb_offset(mb), xfer, uiop);
  		mb->m_len += xfer;
  		len -= xfer;
  		if (len > 0) {
  			MGET(mb2, M_WAIT, MT_DATA);
  			if (len > MLEN)
  				MCLGET(mb2, M_WAIT);
  			mb2->m_len = 0;
  			mb->m_next = mb2;
  			mb = mb2;
  		}
  	}
  
  	if (pad > 0) {
  		if (pad > M_TRAILINGSPACE(mb)) {
  			MGET(mb2, M_WAIT, MT_DATA);
  			mb2->m_len = 0;
  			mb->m_next = mb2;
  			mb = mb2;
  		}
  		memset(mb_offset(mb), 0, pad);
  		mb->m_len += pad;
  	}
  
  	*mp = mb;
  }
  
  /*
   * Copy a buffer to an mbuf chain
   */
  void
  nfsm_buftombuf(struct mbuf **mp, void *buf, size_t len)
  {
  	struct iovec iov;
  	struct uio io;
  
  	iov.iov_base = buf;
  	iov.iov_len = len;
  
  	io.uio_iov = &iov;
  	io.uio_iovcnt = 1;
  	io.uio_resid = len;
  	io.uio_segflg = UIO_SYSSPACE;
  	io.uio_rw = UIO_WRITE;
  
  	nfsm_uiotombuf(mp, &io, len);
  }
  
  /*
   * Copy a string to an mbuf chain
   */
  void
  nfsm_strtombuf(struct mbuf **mp, void *str, size_t len)
  {
  	struct iovec iov[2];
  	struct uio io;
  	uint32_t strlen;
  
  	strlen = txdr_unsigned(len);
  
  	iov[0].iov_base = &strlen;
  	iov[0].iov_len = sizeof(uint32_t);
  	iov[1].iov_base = str;
  	iov[1].iov_len = len;
  
  	io.uio_iov = iov;
  	io.uio_iovcnt = 2;
  	io.uio_resid = sizeof(uint32_t) + len;
  	io.uio_segflg = UIO_SYSSPACE;
  	io.uio_rw = UIO_WRITE;
  
  	nfsm_uiotombuf(mp, &io, io.uio_resid);
  }
  
  /*
   * Help break down an mbuf chain by setting the first siz bytes contiguous
   * pointed to by returned val.
   * This is used by the macros nfsm_dissect and nfsm_dissecton for tough
   * cases. (The macros use the vars. dpos and dpos2)
   */
  int
  nfsm_disct(struct mbuf **mdp, caddr_t *dposp, int siz, int left, caddr_t *cp2)
  {
  	struct mbuf *mp, *mp2;
  	int siz2, xfer;
  	caddr_t p;
  
  	mp = *mdp;
  	while (left == 0) {
  		*mdp = mp = mp->m_next;
  		if (mp == NULL)
  			return (EBADRPC);
  		left = mp->m_len;
  		*dposp = mtod(mp, caddr_t);
  	}
  	if (left >= siz) {
  		*cp2 = *dposp;
  		*dposp += siz;
  	} else if (mp->m_next == NULL) {
  		return (EBADRPC);
  	} else if (siz > MHLEN) {
  		panic("nfs S too big");
  	} else {
  		MGET(mp2, M_WAIT, MT_DATA);
  		mp2->m_next = mp->m_next;
  		mp->m_next = mp2;
  		mp->m_len -= left;
  		mp = mp2;
  		*cp2 = p = mtod(mp, caddr_t);
  		bcopy(*dposp, p, left);		/* Copy what was left */
  		siz2 = siz-left;
  		p += left;
  		mp2 = mp->m_next;
  		/* Loop around copying up the siz2 bytes */
  		while (siz2 > 0) {
  			if (mp2 == NULL)
  				return (EBADRPC);
  			xfer = (siz2 > mp2->m_len) ? mp2->m_len : siz2;
  			if (xfer > 0) {
  				bcopy(mtod(mp2, caddr_t), p, xfer);
  				mp2->m_data += xfer;
  				mp2->m_len -= xfer;
  				p += xfer;
  				siz2 -= xfer;
  			}
  			if (siz2 > 0)
  				mp2 = mp2->m_next;
  		}
  		mp->m_len = siz;
  		*mdp = mp2;
  		*dposp = mtod(mp2, caddr_t);
  	}
  	return (0);
  }
  
  /*
   * Advance the position in the mbuf chain.
   */
  int
  nfs_adv(struct mbuf **mdp, caddr_t *dposp, int offs, int left)
  {
  	struct mbuf *m;
  	int s;
  
  	m = *mdp;
  	s = left;
  	while (s < offs) {
  		offs -= s;
  		m = m->m_next;
  		if (m == NULL)
  			return (EBADRPC);
  		s = m->m_len;
  	}
  	*mdp = m;
  	*dposp = mtod(m, caddr_t)+offs;
  	return (0);
  }
  
  /*
   * Called once to initialize data structures...
   */
  void
  nfs_init(void)
  {
  	rpc_vers = txdr_unsigned(RPC_VER2);
  	rpc_call = txdr_unsigned(RPC_CALL);
  	rpc_reply = txdr_unsigned(RPC_REPLY);
  	rpc_msgdenied = txdr_unsigned(RPC_MSGDENIED);
  	rpc_msgaccepted = txdr_unsigned(RPC_MSGACCEPTED);
  	rpc_mismatch = txdr_unsigned(RPC_MISMATCH);
  	rpc_autherr = txdr_unsigned(RPC_AUTHERR);
  	rpc_auth_unix = txdr_unsigned(RPCAUTH_UNIX);
  	nfs_prog = txdr_unsigned(NFS_PROG);
  	nfs_true = txdr_unsigned(1);
  	nfs_false = txdr_unsigned(0);
  	nfs_xdrneg1 = txdr_unsigned(-1);
  	nfs_ticks = (hz * NFS_TICKINTVL + 500) / 1000;
  	if (nfs_ticks < 1)
  		nfs_ticks = 1;
  #ifdef NFSSERVER
  	nfsrv_init(0);			/* Init server data structures */
  	nfsrv_initcache();		/* Init the server request cache */
  #endif /* NFSSERVER */
  
  	pool_init(&nfsreqpl, sizeof(struct nfsreq), 0, 0, PR_WAITOK,
  	    "nfsreqpl", NULL);
  }
  
  #ifdef NFSCLIENT
  int
  nfs_vfs_init(struct vfsconf *vfsp)
  {
  	extern struct pool nfs_node_pool;
  
  	TAILQ_INIT(&nfs_bufq);
  
  	pool_init(&nfs_node_pool, sizeof(struct nfsnode), 0, 0, PR_WAITOK,
  	    "nfsnodepl", NULL);
  
  	return (0);
  }
  
  /*
   * Attribute cache routines.
   * nfs_loadattrcache() - loads or updates the cache contents from attributes
   *	that are on the mbuf list
   * nfs_getattrcache() - returns valid attributes if found in cache, returns
   *	error otherwise
   */
  
  /*
   * Load the attribute cache (that lives in the nfsnode entry) with
   * the values on the mbuf list and
   * Iff vap not NULL
   *    copy the attributes to *vaper
   */
  int
  nfs_loadattrcache(struct vnode **vpp, struct mbuf **mdp, caddr_t *dposp,
      struct vattr *vaper)
  {
  	struct vnode *vp = *vpp;
  	struct vattr *vap;
  	struct nfs_fattr *fp;
  	extern struct vops nfs_specvops;
  	struct nfsnode *np;
  	int32_t t1;
  	caddr_t cp2;
  	int error = 0;
  	int32_t rdev;
  	struct mbuf *md;
  	enum vtype vtyp;
  	mode_t vmode;
  	struct timespec mtime;
  	struct vnode *nvp;
  	int v3 = NFS_ISV3(vp);
  	uid_t uid;
  	gid_t gid;
  
  	md = *mdp;
  	t1 = (mtod(md, caddr_t) + md->m_len) - *dposp;
  	error = nfsm_disct(mdp, dposp, NFSX_FATTR(v3), t1, &cp2);
  	if (error)
  		return (error);
  	fp = (struct nfs_fattr *)cp2;
  	if (v3) {
  		vtyp = nfsv3tov_type(fp->fa_type);
  		vmode = fxdr_unsigned(mode_t, fp->fa_mode);
  		rdev = makedev(fxdr_unsigned(u_int32_t, fp->fa3_rdev.specdata1),
  			fxdr_unsigned(u_int32_t, fp->fa3_rdev.specdata2));
  		fxdr_nfsv3time(&fp->fa3_mtime, &mtime);
  	} else {
  		vtyp = nfsv2tov_type(fp->fa_type);
  		vmode = fxdr_unsigned(mode_t, fp->fa_mode);
  		if (vtyp == VNON || vtyp == VREG)
  			vtyp = IFTOVT(vmode);
  		rdev = fxdr_unsigned(int32_t, fp->fa2_rdev);
  		fxdr_nfsv2time(&fp->fa2_mtime, &mtime);
  
  		/*
  		 * Really ugly NFSv2 kludge.
  		 */
  		if (vtyp == VCHR && rdev == 0xffffffff)
  			vtyp = VFIFO;
  	}
  
  	/*
  	 * If v_type == VNON it is a new node, so fill in the v_type,
  	 * n_mtime fields. Check to see if it represents a special 
  	 * device, and if so, check for a possible alias. Once the
  	 * correct vnode has been obtained, fill in the rest of the
  	 * information.
  	 */
  	np = VTONFS(vp);
  	if (vp->v_type != vtyp) {
  		cache_purge(vp);
  		vp->v_type = vtyp;
  		if (vp->v_type == VFIFO) {
  #ifndef FIFO
  			return (EOPNOTSUPP);
  #else
                          extern struct vops nfs_fifovops;
  			vp->v_op = &nfs_fifovops;
  #endif /* FIFO */
  		}
  		if (vp->v_type == VCHR || vp->v_type == VBLK) {
  			vp->v_op = &nfs_specvops;
  			nvp = checkalias(vp, (dev_t)rdev, vp->v_mount);
  			if (nvp) {
  				/*
  				 * Discard unneeded vnode, but save its nfsnode.
  				 * Since the nfsnode does not have a lock, its
  				 * vnode lock has to be carried over.
  				 */
  
  				nvp->v_data = vp->v_data;
  				vp->v_data = NULL;
  				vp->v_op = &spec_vops;
  				vrele(vp);
  				vgone(vp);
  				/*
  				 * Reinitialize aliased node.
  				 */
  				np->n_vnode = nvp;
  				*vpp = vp = nvp;
  			}
  		}
  		np->n_mtime = mtime;
  	}
  	vap = &np->n_vattr;
  	vap->va_type = vtyp;
  	vap->va_rdev = (dev_t)rdev;
  	vap->va_mtime = mtime;
  	vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
  
  	uid = fxdr_unsigned(uid_t, fp->fa_uid);
  	gid = fxdr_unsigned(gid_t, fp->fa_gid);
  	/* Invalidate access cache if uid, gid or mode changed. */
  	if (np->n_accstamp != -1 &&
  	    (gid != vap->va_gid || uid != vap->va_uid ||
  	    (vmode & 07777) != vap->va_mode))
  		np->n_accstamp = -1;
  
  	vap->va_mode = (vmode & 07777);
  
  	switch (vtyp) {
  	case VBLK:
  		vap->va_blocksize = BLKDEV_IOSIZE;
  		break;
  	case VCHR:
  		vap->va_blocksize = MAXBSIZE;
  		break;
  	default:
  		vap->va_blocksize = v3 ? vp->v_mount->mnt_stat.f_iosize :
  		     fxdr_unsigned(int32_t, fp->fa2_blocksize);
  		break;
  	}
  	if (v3) {
  		vap->va_nlink = fxdr_unsigned(nlink_t, fp->fa_nlink);
  		vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid);
  		vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid);
  		vap->va_size = fxdr_hyper(&fp->fa3_size);
  		vap->va_bytes = fxdr_hyper(&fp->fa3_used);
  		vap->va_fileid = fxdr_hyper(&fp->fa3_fileid);
  		fxdr_nfsv3time(&fp->fa3_atime, &vap->va_atime);
  		fxdr_nfsv3time(&fp->fa3_ctime, &vap->va_ctime);
  		vap->va_flags = 0;
  		vap->va_filerev = 0;
  	} else {
  		vap->va_nlink = fxdr_unsigned(nlink_t, fp->fa_nlink);
  		vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid);
  		vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid);
  		vap->va_size = fxdr_unsigned(u_int32_t, fp->fa2_size);
  		vap->va_bytes =
  		    (u_quad_t)fxdr_unsigned(int32_t, fp->fa2_blocks) *
  		    NFS_FABLKSIZE;
  		vap->va_fileid = fxdr_unsigned(int32_t, fp->fa2_fileid);
  		fxdr_nfsv2time(&fp->fa2_atime, &vap->va_atime);
  		vap->va_flags = 0;
  		vap->va_ctime.tv_sec = fxdr_unsigned(u_int32_t,
  		    fp->fa2_ctime.nfsv2_sec);
  		vap->va_ctime.tv_nsec = 0;
  		vap->va_gen = fxdr_unsigned(u_int32_t,fp->fa2_ctime.nfsv2_usec);
  		vap->va_filerev = 0;
  	}
  
  	if (vap->va_size != np->n_size) {
  		if (vap->va_type == VREG) {
  			if (np->n_flag & NMODIFIED) {
  				if (vap->va_size < np->n_size)
  					vap->va_size = np->n_size;
  				else
  					np->n_size = vap->va_size;
  			} else
  				np->n_size = vap->va_size;
  			uvm_vnp_setsize(vp, np->n_size);
  		} else
  			np->n_size = vap->va_size;
  	}
  	np->n_attrstamp = time_second;
  	if (vaper != NULL) {
  		bcopy(vap, vaper, sizeof(*vap));
  		if (np->n_flag & NCHG) {
  			if (np->n_flag & NACC)
  				vaper->va_atime = np->n_atim;
  			if (np->n_flag & NUPD)
  				vaper->va_mtime = np->n_mtim;
  		}
  	}
  	return (0);
  }
  
  int
  nfs_attrtimeo(struct nfsnode *np)
  {
  	struct vnode *vp = np->n_vnode;
  	struct nfsmount *nmp = VFSTONFS(vp->v_mount);
  	int tenthage = (time_second - np->n_mtime.tv_sec) / 10;
  	int minto, maxto;
  
  	if (vp->v_type == VDIR) {
  		maxto = nmp->nm_acdirmax;
  		minto = nmp->nm_acdirmin;
  	}
  	else {
  		maxto = nmp->nm_acregmax;
  		minto = nmp->nm_acregmin;
  	}
  
  	if (np->n_flag & NMODIFIED || tenthage < minto)
  		return minto;
  	else if (tenthage < maxto)
  		return tenthage;
  	else
  		return maxto;
  }
  
  /*
   * Check the time stamp
   * If the cache is valid, copy contents to *vap and return 0
   * otherwise return an error
   */
  int
  nfs_getattrcache(struct vnode *vp, struct vattr *vaper)
  {
  	struct nfsnode *np = VTONFS(vp);
  	struct vattr *vap;
  
  	if (np->n_attrstamp == 0 ||
  	    (time_second - np->n_attrstamp) >= nfs_attrtimeo(np)) {
  		nfsstats.attrcache_misses++;
  		return (ENOENT);
  	}
  	nfsstats.attrcache_hits++;
  	vap = &np->n_vattr;
  	if (vap->va_size != np->n_size) {
  		if (vap->va_type == VREG) {
  			if (np->n_flag & NMODIFIED) {
  				if (vap->va_size < np->n_size)
  					vap->va_size = np->n_size;
  				else
  					np->n_size = vap->va_size;
  			} else
  				np->n_size = vap->va_size;
  			uvm_vnp_setsize(vp, np->n_size);
  		} else
  			np->n_size = vap->va_size;
  	}
  	bcopy(vap, vaper, sizeof(struct vattr));
  	if (np->n_flag & NCHG) {
  		if (np->n_flag & NACC)
  			vaper->va_atime = np->n_atim;
  		if (np->n_flag & NUPD)
  			vaper->va_mtime = np->n_mtim;
  	}
  	return (0);
  }
  #endif /* NFSCLIENT */
  
  /*
   * Set up nameidata for a lookup() call and do it
   */
  int
  nfs_namei(struct nameidata *ndp, fhandle_t *fhp, int len,
      struct nfssvc_sock *slp, struct mbuf *nam, struct mbuf **mdp,
      caddr_t *dposp, struct vnode **retdirp, struct proc *p)
  {
  	int i, rem;
  	struct mbuf *md;
  	char *fromcp, *tocp;
  	struct vnode *dp;
  	int error, rdonly;
  	struct componentname *cnp = &ndp->ni_cnd;
  
  	*retdirp = NULL;
  	cnp->cn_pnbuf = pool_get(&namei_pool, PR_WAITOK);
  	/*
  	 * Copy the name from the mbuf list to ndp->ni_pnbuf
  	 * and set the various ndp fields appropriately.
  	 */
  	fromcp = *dposp;
  	tocp = cnp->cn_pnbuf;
  	md = *mdp;
  	rem = mtod(md, caddr_t) + md->m_len - fromcp;
  	for (i = 0; i < len; i++) {
  		while (rem == 0) {
  			md = md->m_next;
  			if (md == NULL) {
  				error = EBADRPC;
  				goto out;
  			}
  			fromcp = mtod(md, caddr_t);
  			rem = md->m_len;
  		}
  		if (*fromcp == '\0' || *fromcp == '/') {
  			error = EACCES;
  			goto out;
  		}
  		*tocp++ = *fromcp++;
  		rem--;
  	}
  	*tocp = '\0';
  	*mdp = md;
  	*dposp = fromcp;
  	len = nfsm_padlen(len);
  	if (len > 0) {
  		if (rem >= len)
  			*dposp += len;
  		else if ((error = nfs_adv(mdp, dposp, len, rem)) != 0)
  			goto out;
  	}
  	ndp->ni_pathlen = tocp - cnp->cn_pnbuf;
  	cnp->cn_nameptr = cnp->cn_pnbuf;
  	/*
  	 * Extract and set starting directory.
  	 */
  	error = nfsrv_fhtovp(fhp, 0, &dp, ndp->ni_cnd.cn_cred, slp,
  	    nam, &rdonly);
  	if (error)
  		goto out;
  	if (dp->v_type != VDIR) {
  		vrele(dp);
  		error = ENOTDIR;
  		goto out;
  	}
  	vref(dp);
  	*retdirp = dp;
  	ndp->ni_startdir = dp;
  	if (rdonly)
  		cnp->cn_flags |= (NOCROSSMOUNT | RDONLY);
  	else
  		cnp->cn_flags |= NOCROSSMOUNT;
  
  	/*
  	 * Should be 0, if not someone didn't init ndp with NDINIT,
  	 * go find and murder the offender messily.
  	 */
  	KASSERT (ndp->ni_p_path == NULL && ndp->ni_p_size == 0);
  
  	/*
  	 * And call lookup() to do the real work
  	 */
  	cnp->cn_proc = p;
  	error = vfs_lookup(ndp);
  	if (error)
  		goto out;
  	/*
  	 * Check for encountering a symbolic link
  	 */
  	if (cnp->cn_flags & ISSYMLINK) {
  		if ((cnp->cn_flags & LOCKPARENT) && ndp->ni_pathlen == 1)
  			vput(ndp->ni_dvp);
  		else
  			vrele(ndp->ni_dvp);
  		vput(ndp->ni_vp);
  		ndp->ni_vp = NULL;
  		error = EINVAL;
  		goto out;
  	}
  	/*
  	 * Check for saved name request
  	 */
  	if (cnp->cn_flags & (SAVENAME | SAVESTART)) {
  		cnp->cn_flags |= HASBUF;
  		return (0);
  	}
  out:
  	pool_put(&namei_pool, cnp->cn_pnbuf);
  	return (error);
  }
  
  /*
   * A fiddled version of m_adj() that ensures null fill to a long
   * boundary and only trims off the back end
   */
  void
  nfsm_adj(struct mbuf *mp, int len, int nul)
  {
  	struct mbuf *m;
  	int count, i;
  	char *cp;
  
  	/*
  	 * Trim from tail.  Scan the mbuf chain,
  	 * calculating its length and finding the last mbuf.
  	 * If the adjustment only affects this mbuf, then just
  	 * adjust and return.  Otherwise, rescan and truncate
  	 * after the remaining size.
  	 */
  	count = 0;
  	m = mp;
  	for (;;) {
  		count += m->m_len;
  		if (m->m_next == NULL)
  			break;
  		m = m->m_next;
  	}
  	if (m->m_len > len) {
  		m->m_len -= len;
  		if (nul > 0) {
  			cp = mtod(m, caddr_t)+m->m_len-nul;
  			for (i = 0; i < nul; i++)
  				*cp++ = '\0';
  		}
  		return;
  	}
  	count -= len;
  	if (count < 0)
  		count = 0;
  	/*
  	 * Correct length for chain is "count".
  	 * Find the mbuf with last data, adjust its length,
  	 * and toss data from remaining mbufs on chain.
  	 */
  	for (m = mp; m; m = m->m_next) {
  		if (m->m_len >= count) {
  			m->m_len = count;
  			if (nul > 0) {
  				cp = mtod(m, caddr_t)+m->m_len-nul;
  				for (i = 0; i < nul; i++)
  					*cp++ = '\0';
  			}
  			break;
  		}
  		count -= m->m_len;
  	}
  	for (m = m->m_next;m;m = m->m_next)
  		m->m_len = 0;
  }
  
  /*
   * Make these functions instead of macros, so that the kernel text size
   * doesn't get too big...
   */
  void
  nfsm_srvwcc(struct nfsrv_descript *nfsd, int before_ret,
      struct vattr *before_vap, int after_ret, struct vattr *after_vap,
      struct nfsm_info *info)
  {
  	u_int32_t *tl;
  
  	if (before_ret) {
  		tl = nfsm_build(&info->nmi_mb, NFSX_UNSIGNED);
  		*tl = nfs_false;
  	} else {
  		tl = nfsm_build(&info->nmi_mb, 7 * NFSX_UNSIGNED);
  		*tl++ = nfs_true;
  		txdr_hyper(before_vap->va_size, tl);
  		tl += 2;
  		txdr_nfsv3time(&(before_vap->va_mtime), tl);
  		tl += 2;
  		txdr_nfsv3time(&(before_vap->va_ctime), tl);
  	}
  	nfsm_srvpostop_attr(nfsd, after_ret, after_vap, info);
  }
  
  void
  nfsm_srvpostop_attr(struct nfsrv_descript *nfsd, int after_ret,
      struct vattr *after_vap, struct nfsm_info *info)
  {
  	u_int32_t *tl;
  	struct nfs_fattr *fp;
  
  	if (after_ret) {
  		tl = nfsm_build(&info->nmi_mb, NFSX_UNSIGNED);
  		*tl = nfs_false;
  	} else {
  		tl = nfsm_build(&info->nmi_mb, NFSX_UNSIGNED + NFSX_V3FATTR);
  		*tl++ = nfs_true;
  		fp = (struct nfs_fattr *)tl;
  		nfsm_srvfattr(nfsd, after_vap, fp);
  	}
  }
  
  void
  nfsm_srvfattr(struct nfsrv_descript *nfsd, struct vattr *vap,
      struct nfs_fattr *fp)
  {
  
  	fp->fa_nlink = txdr_unsigned(vap->va_nlink);
  	fp->fa_uid = txdr_unsigned(vap->va_uid);
  	fp->fa_gid = txdr_unsigned(vap->va_gid);
  	if (nfsd->nd_flag & ND_NFSV3) {
  		fp->fa_type = vtonfsv3_type(vap->va_type);
  		fp->fa_mode = vtonfsv3_mode(vap->va_mode);
  		txdr_hyper(vap->va_size, &fp->fa3_size);
  		txdr_hyper(vap->va_bytes, &fp->fa3_used);
  		fp->fa3_rdev.specdata1 = txdr_unsigned(major(vap->va_rdev));
  		fp->fa3_rdev.specdata2 = txdr_unsigned(minor(vap->va_rdev));
  		fp->fa3_fsid.nfsuquad[0] = 0;
  		fp->fa3_fsid.nfsuquad[1] = txdr_unsigned(vap->va_fsid);
  		txdr_hyper(vap->va_fileid, &fp->fa3_fileid);
  		txdr_nfsv3time(&vap->va_atime, &fp->fa3_atime);
  		txdr_nfsv3time(&vap->va_mtime, &fp->fa3_mtime);
  		txdr_nfsv3time(&vap->va_ctime, &fp->fa3_ctime);
  	} else {
  		fp->fa_type = vtonfsv2_type(vap->va_type);
  		fp->fa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode);
  		fp->fa2_size = txdr_unsigned(vap->va_size);
  		fp->fa2_blocksize = txdr_unsigned(vap->va_blocksize);
  		if (vap->va_type == VFIFO)
  			fp->fa2_rdev = 0xffffffff;
  		else
  			fp->fa2_rdev = txdr_unsigned(vap->va_rdev);
  		fp->fa2_blocks = txdr_unsigned(vap->va_bytes / NFS_FABLKSIZE);
  		fp->fa2_fsid = txdr_unsigned(vap->va_fsid);
  		fp->fa2_fileid = txdr_unsigned((u_int32_t)vap->va_fileid);
  		txdr_nfsv2time(&vap->va_atime, &fp->fa2_atime);
  		txdr_nfsv2time(&vap->va_mtime, &fp->fa2_mtime);
  		txdr_nfsv2time(&vap->va_ctime, &fp->fa2_ctime);
  	}
  }
  
  /*
   * nfsrv_fhtovp() - convert a fh to a vnode ptr (optionally locked)
   * 	- look up fsid in mount list (if not found ret error)
   *	- get vp and export rights by calling VFS_FHTOVP() and VFS_CHECKEXP()
   *	- if cred->cr_uid == 0 or MNT_EXPORTANON set it to credanon
   *	- if not lockflag unlock it with VOP_UNLOCK()
   */
  int
  nfsrv_fhtovp(fhandle_t *fhp, int lockflag, struct vnode **vpp,
      struct ucred *cred, struct nfssvc_sock *slp, struct mbuf *nam,
      int *rdonlyp)
  {
  	struct proc *p = curproc;	/* XXX */
  	struct mount *mp;
  	int i;
  	struct ucred *credanon;
  	int error, exflags;
  	struct sockaddr_in *saddr;
  
  	*vpp = NULL;
  	mp = vfs_getvfs(&fhp->fh_fsid);
  
  	if (!mp)
  		return (ESTALE);
  	error = VFS_CHECKEXP(mp, nam, &exflags, &credanon);
  	if (error)
  		return (error);
  	error = VFS_FHTOVP(mp, &fhp->fh_fid, vpp);
  	if (error)
  		return (error);
  
  	saddr = mtod(nam, struct sockaddr_in *);
  	if (saddr->sin_family == AF_INET &&
  	    (ntohs(saddr->sin_port) >= IPPORT_RESERVED ||
  	    (slp->ns_so->so_type == SOCK_STREAM && ntohs(saddr->sin_port) == 20))) {
  		vput(*vpp);
  		return (NFSERR_AUTHERR | AUTH_TOOWEAK);
  	}
  
  	/* Check/setup credentials. */
  	if (cred->cr_uid == 0 || (exflags & MNT_EXPORTANON)) {
  		cred->cr_uid = credanon->cr_uid;
  		cred->cr_gid = credanon->cr_gid;
  		for (i = 0; i < credanon->cr_ngroups && i < NGROUPS_MAX; i++)
  			cred->cr_groups[i] = credanon->cr_groups[i];
  		cred->cr_ngroups = i;
  	}
  	if (exflags & MNT_EXRDONLY)
  		*rdonlyp = 1;
  	else
  		*rdonlyp = 0;
  	if (!lockflag)
  		VOP_UNLOCK(*vpp, p);
  
  	return (0);
  }
  
  /*
   * This function compares two net addresses by family and returns non zero
   * if they are the same host, or if there is any doubt it returns 0.
   * The AF_INET family is handled as a special case so that address mbufs
   * don't need to be saved to store "struct in_addr", which is only 4 bytes.
   */
  int
  netaddr_match(int family, union nethostaddr *haddr, struct mbuf *nam)
  {
  	struct sockaddr_in *inetaddr;
  
  	switch (family) {
  	case AF_INET:
  		inetaddr = mtod(nam, struct sockaddr_in *);
  		if (inetaddr->sin_family == AF_INET &&
  		    inetaddr->sin_addr.s_addr == haddr->had_inetaddr)
  			return (1);
  		break;
  	default:
  		break;
  	};
  	return (0);
  }
  
  /*
   * The write verifier has changed (probably due to a server reboot), so all
   * B_NEEDCOMMIT blocks will have to be written again. Since they are on the
   * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT
   * flag. Once done the new write verifier can be set for the mount point.
   */
  void
  nfs_clearcommit(struct mount *mp)
  {
  	struct vnode *vp, *nvp;
  	struct buf *bp, *nbp;
  	int s;
  
  	s = splbio();
  loop:
  	for (vp = LIST_FIRST(&mp->mnt_vnodelist); vp != NULL; vp = nvp) {
  		if (vp->v_mount != mp)	/* Paranoia */
  			goto loop;
  		nvp = LIST_NEXT(vp, v_mntvnodes);
  		for (bp = LIST_FIRST(&vp->v_dirtyblkhd); bp != NULL; bp = nbp) {
  			nbp = LIST_NEXT(bp, b_vnbufs);
  			if ((bp->b_flags & (B_BUSY | B_DELWRI | B_NEEDCOMMIT))
  				== (B_DELWRI | B_NEEDCOMMIT))
  				bp->b_flags &= ~B_NEEDCOMMIT;
  		}
  	}
  	splx(s);
  }
  
  void
  nfs_merge_commit_ranges(struct vnode *vp)
  {
  	struct nfsnode *np = VTONFS(vp);
  
  	if (!(np->n_commitflags & NFS_COMMIT_PUSHED_VALID)) {
  		np->n_pushedlo = np->n_pushlo;
  		np->n_pushedhi = np->n_pushhi;
  		np->n_commitflags |= NFS_COMMIT_PUSHED_VALID;
  	} else {
  		if (np->n_pushlo < np->n_pushedlo)
  			np->n_pushedlo = np->n_pushlo;
  		if (np->n_pushhi > np->n_pushedhi)
  			np->n_pushedhi = np->n_pushhi;
  	}
  
  	np->n_pushlo = np->n_pushhi = 0;
  	np->n_commitflags &= ~NFS_COMMIT_PUSH_VALID;
  }
  
  int
  nfs_in_committed_range(struct vnode *vp, struct buf *bp)
  {
  	struct nfsnode *np = VTONFS(vp);
  	off_t lo, hi;
  
  	if (!(np->n_commitflags & NFS_COMMIT_PUSHED_VALID))
  		return 0;
  	lo = (off_t)bp->b_blkno * DEV_BSIZE;
  	hi = lo + bp->b_dirtyend;
  
  	return (lo >= np->n_pushedlo && hi <= np->n_pushedhi);
  }
  
  int
  nfs_in_tobecommitted_range(struct vnode *vp, struct buf *bp)
  {
  	struct nfsnode *np = VTONFS(vp);
  	off_t lo, hi;
  
  	if (!(np->n_commitflags & NFS_COMMIT_PUSH_VALID))
  		return 0;
  	lo = (off_t)bp->b_blkno * DEV_BSIZE;
  	hi = lo + bp->b_dirtyend;
  
  	return (lo >= np->n_pushlo && hi <= np->n_pushhi);
  }
  
  void
  nfs_add_committed_range(struct vnode *vp, struct buf *bp)
  {
  	struct nfsnode *np = VTONFS(vp);
  	off_t lo, hi;
  
  	lo = (off_t)bp->b_blkno * DEV_BSIZE;
  	hi = lo + bp->b_dirtyend;
  
  	if (!(np->n_commitflags & NFS_COMMIT_PUSHED_VALID)) {
  		np->n_pushedlo = lo;
  		np->n_pushedhi = hi;
  		np->n_commitflags |= NFS_COMMIT_PUSHED_VALID;
  	} else {
  		if (hi > np->n_pushedhi)
  			np->n_pushedhi = hi;
  		if (lo < np->n_pushedlo)
  			np->n_pushedlo = lo;
  	}
  }
  
  void
  nfs_del_committed_range(struct vnode *vp, struct buf *bp)
  {
  	struct nfsnode *np = VTONFS(vp);
  	off_t lo, hi;
  
  	if (!(np->n_commitflags & NFS_COMMIT_PUSHED_VALID))
  		return;
  
  	lo = (off_t)bp->b_blkno * DEV_BSIZE;
  	hi = lo + bp->b_dirtyend;
  
  	if (lo > np->n_pushedhi || hi < np->n_pushedlo)
  		return;
  	if (lo <= np->n_pushedlo)
  		np->n_pushedlo = hi;
  	else if (hi >= np->n_pushedhi)
  		np->n_pushedhi = lo;
  	else {
  		/*
  		 * XXX There's only one range. If the deleted range
  		 * is in the middle, pick the largest of the
  		 * contiguous ranges that it leaves.
  		 */
  		if ((np->n_pushedlo - lo) > (hi - np->n_pushedhi))
  			np->n_pushedhi = lo;
  		else
  			np->n_pushedlo = hi;
  	}
  }
  
  void
  nfs_add_tobecommitted_range(struct vnode *vp, struct buf *bp)
  {
  	struct nfsnode *np = VTONFS(vp);
  	off_t lo, hi;
  
  	lo = (off_t)bp->b_blkno * DEV_BSIZE;
  	hi = lo + bp->b_dirtyend;
  
  	if (!(np->n_commitflags & NFS_COMMIT_PUSH_VALID)) {
  		np->n_pushlo = lo;
  		np->n_pushhi = hi;
  		np->n_commitflags |= NFS_COMMIT_PUSH_VALID;
  	} else {
  		if (lo < np->n_pushlo)
  			np->n_pushlo = lo;
  		if (hi > np->n_pushhi)
  			np->n_pushhi = hi;
  	}
  }
  
  void
  nfs_del_tobecommitted_range(struct vnode *vp, struct buf *bp)
  {
  	struct nfsnode *np = VTONFS(vp);
  	off_t lo, hi;
  
  	if (!(np->n_commitflags & NFS_COMMIT_PUSH_VALID))
  		return;
  
  	lo = (off_t)bp->b_blkno * DEV_BSIZE;
  	hi = lo + bp->b_dirtyend;
  
  	if (lo > np->n_pushhi || hi < np->n_pushlo)
  		return;
  
  	if (lo <= np->n_pushlo)
  		np->n_pushlo = hi;
  	else if (hi >= np->n_pushhi)
  		np->n_pushhi = lo;
  	else {
  		/*
  		 * XXX There's only one range. If the deleted range
  		 * is in the middle, pick the largest of the
  		 * contiguous ranges that it leaves.
  		 */
  		if ((np->n_pushlo - lo) > (hi - np->n_pushhi))
  			np->n_pushhi = lo;
  		else
  			np->n_pushlo = hi;
  	}
  }
  
  /*
   * Map errnos to NFS error numbers. For Version 3 also filter out error
   * numbers not specified for the associated procedure.
   */
  int
  nfsrv_errmap(struct nfsrv_descript *nd, int err)
  {
  	short *defaulterrp, *errp;
  
  	if (nd->nd_flag & ND_NFSV3) {
  	    if (nd->nd_procnum <= NFSPROC_COMMIT) {
  		errp = defaulterrp = nfsrv_v3errmap[nd->nd_procnum];
  		while (*++errp) {
  			if (*errp == err)
  				return (err);
  			else if (*errp > err)
  				break;
  		}
  		return ((int)*defaulterrp);
  	    } else
  		return (err & 0xffff);
  	}
  	if (err <= nitems(nfsrv_v2errmap))
  		return ((int)nfsrv_v2errmap[err - 1]);
  	return (NFSERR_IO);
  }
  
  /*
   * If full is non zero, set all fields, otherwise just set mode and time fields
   */
  void
  nfsm_v3attrbuild(struct mbuf **mp, struct vattr *a, int full)
  {
  	struct mbuf *mb;
  	u_int32_t *tl;
  
  	mb = *mp;
  
  	if (a->va_mode != (mode_t)VNOVAL) {
  		tl = nfsm_build(&mb, 2 * NFSX_UNSIGNED);
  		*tl++ = nfs_true;
  		*tl = txdr_unsigned(a->va_mode);
  	} else {
  		tl = nfsm_build(&mb, NFSX_UNSIGNED);
  		*tl = nfs_false;
  	}
  	if (full && a->va_uid != (uid_t)VNOVAL) {
  		tl = nfsm_build(&mb, 2 * NFSX_UNSIGNED);
  		*tl++ = nfs_true;
  		*tl = txdr_unsigned(a->va_uid);
  	} else {
  		tl = nfsm_build(&mb, NFSX_UNSIGNED);
  		*tl = nfs_false;
  	}
  	if (full && a->va_gid != (gid_t)VNOVAL) {
  		tl = nfsm_build(&mb, 2 * NFSX_UNSIGNED);
  		*tl++ = nfs_true;
  		*tl = txdr_unsigned((a)->va_gid);
  	} else {
  		tl = nfsm_build(&mb, NFSX_UNSIGNED);
  		*tl = nfs_false;
  	}
  	if (full && a->va_size != VNOVAL) {
  		tl = nfsm_build(&mb, 3 * NFSX_UNSIGNED);
  		*tl++ = nfs_true;
  		txdr_hyper(a->va_size, tl);
  	} else {
  		tl = nfsm_build(&mb, NFSX_UNSIGNED);
  		*tl = nfs_false;
  	}
  	if (a->va_atime.tv_nsec != VNOVAL) {
  		if (a->va_atime.tv_sec != time_second) {
  			tl = nfsm_build(&mb, 3 * NFSX_UNSIGNED);
  			*tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT);
  			txdr_nfsv3time(&a->va_atime, tl);
  		} else {
  			tl = nfsm_build(&mb, NFSX_UNSIGNED);
  			*tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER);
  		}
  	} else {
  		tl = nfsm_build(&mb, NFSX_UNSIGNED);
  		*tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE);
  	}
  	if (a->va_mtime.tv_nsec != VNOVAL) {
  		if (a->va_mtime.tv_sec != time_second) {
  			tl = nfsm_build(&mb, 3 * NFSX_UNSIGNED);
  			*tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT);
  			txdr_nfsv3time(&a->va_mtime, tl);
  		} else {
  			tl = nfsm_build(&mb, NFSX_UNSIGNED);
  			*tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER);
  		}
  	} else {
  		tl = nfsm_build(&mb, NFSX_UNSIGNED);
  		*tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE);
  	}
  
  	*mp = mb;
  }
  
  /*
   * Ensure a contiguous buffer len bytes long
   */
  void *
  nfsm_build(struct mbuf **mp, u_int len)
  {
  	struct mbuf *mb, *mb2;
  	caddr_t bpos;
  
  	mb = *mp;
  	bpos = mb_offset(mb);
  
  	if (len > M_TRAILINGSPACE(mb)) {
  		MGET(mb2, M_WAIT, MT_DATA);
  		if (len > MLEN)
  			panic("build > MLEN");
  		mb->m_next = mb2;
  		mb = mb2;
  		mb->m_len = 0;
  		bpos = mtod(mb, caddr_t);
  	}
  	mb->m_len += len;
  
  	*mp = mb;
  
  	return (bpos);
  }
  
  void
  nfsm_fhtom(struct nfsm_info *info, struct vnode *v, int v3)
  {
  	struct nfsnode *n = VTONFS(v);
  
  	if (v3) {
  		nfsm_strtombuf(&info->nmi_mb, n->n_fhp, n->n_fhsize);
  	} else {
  		nfsm_buftombuf(&info->nmi_mb, n->n_fhp, NFSX_V2FH);
  	}
  }
  
  void
  nfsm_srvfhtom(struct mbuf **mp, fhandle_t *f, int v3)
  {
  	if (v3) {
  		nfsm_strtombuf(mp, f, NFSX_V3FH);
  	} else {
  		nfsm_buftombuf(mp, f, NFSX_V2FH);
  	}
  }
  
  int
  nfsm_srvsattr(struct mbuf **mp, struct vattr *va, struct mbuf *mrep,
      caddr_t *dposp)
  {
  	struct nfsm_info	info;
  	uint32_t *tl, t1;
  	caddr_t cp2;
  	int error = 0;
  
  	info.nmi_md = *mp;
  	info.nmi_dpos = *dposp;
  
  	nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
  	if (*tl == nfs_true) {
  		nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
  		va->va_mode = nfstov_mode(*tl);
  	}
  
  	nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
  	if (*tl == nfs_true) {
  		nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
  		va->va_uid = fxdr_unsigned(uid_t, *tl);
  	}
  
  	nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
  	if (*tl == nfs_true) {
  		nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
  		va->va_gid = fxdr_unsigned(gid_t, *tl);
  	}
  
  	nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
  	if (*tl == nfs_true) {
  		nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
  		va->va_size = fxdr_hyper(tl);
  	}
  
  	nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
  	switch (fxdr_unsigned(int, *tl)) {
  	case NFSV3SATTRTIME_TOCLIENT:
  		va->va_vaflags |= VA_UTIMES_CHANGE;
  		va->va_vaflags &= ~VA_UTIMES_NULL;
  		nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
  		fxdr_nfsv3time(tl, &va->va_atime);
  		break;
  	case NFSV3SATTRTIME_TOSERVER:
  		va->va_vaflags |= VA_UTIMES_CHANGE;
  		getnanotime(&va->va_atime);
  		break;
  	};
  
  	nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
  	switch (fxdr_unsigned(int, *tl)) {
  	case NFSV3SATTRTIME_TOCLIENT:
  		va->va_vaflags |= VA_UTIMES_CHANGE;
  		va->va_vaflags &= ~VA_UTIMES_NULL;
  		nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
  		fxdr_nfsv3time(tl, &va->va_mtime);
  		break;
  	case NFSV3SATTRTIME_TOSERVER:
  		va->va_vaflags |= VA_UTIMES_CHANGE;
  		getnanotime(&va->va_mtime);
  		break;
  	};
  
  	*dposp = info.nmi_dpos;
  	*mp = info.nmi_md;
  nfsmout:
  	return (error);
  }
  
  void
  txdr_nfsv2time(const struct timespec *from, struct nfsv2_time *to)
  {
  	if (from->tv_nsec == VNOVAL) {
  		to->nfsv2_sec = nfs_xdrneg1;
  		to->nfsv2_usec = nfs_xdrneg1;
  	} else if (from->tv_sec == -1) {
  		/*
  		 * can't request a time of -1; send
  		 * -1.000001 == {-2,999999} instead
  		 */
  		to->nfsv2_sec = htonl(-2);
  		to->nfsv2_usec = htonl(999999);
  	} else {
  		to->nfsv2_sec = htonl(from->tv_sec);
  		to->nfsv2_usec = htonl(from->tv_nsec / 1000);
  	}
  }
  