sys/fs/nfsserver/nfs_nfsdport.c

   1 /*-
   2  * Copyright (c) 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Rick Macklem at The University of Guelph.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 4. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  */
  33
  34 #include <sys/cdefs.h>
  35 __FBSDID("$FreeBSD$");
  36
  37 /*
  38  * Functions that perform the vfs operations required by the routines in
  39  * nfsd_serv.c. It is hoped that this change will make the server more
  40  * portable.
  41  */
  42
  43 #include <fs/nfs/nfsport.h>
  44 #include <sys/hash.h>
  45 #include <sys/sysctl.h>
  46 #include <nlm/nlm_prot.h>
  47 #include <nlm/nlm.h>
  48
  49 extern u_int32_t newnfs_true, newnfs_false, newnfs_xdrneg1;
  50 extern int nfsv4root_set;
  51 extern int nfsrv_useacl;
  52 extern int newnfs_numnfsd;
  53 extern struct mount nfsv4root_mnt;
  54 extern struct nfsrv_stablefirst nfsrv_stablefirst;
  55 extern void (*nfsd_call_servertimer)(void);
  56 struct vfsoptlist nfsv4root_opt, nfsv4root_newopt;
  57 NFSDLOCKMUTEX;
  58 struct mtx nfs_cache_mutex;
  59 struct mtx nfs_v4root_mutex;
  60 struct nfsrvfh nfs_rootfh, nfs_pubfh;
  61 int nfs_pubfhset = 0, nfs_rootfhset = 0;
  62 static uint32_t nfsv4_sysid = 0;
  63
  64 static int nfssvc_srvcall(struct thread *, struct nfssvc_args *,
  65     struct ucred *);
  66
  67 static int enable_crossmntpt = 1;
  68 static int nfs_commit_blks;
  69 static int nfs_commit_miss;
  70 extern int nfsrv_issuedelegs;
  71 extern int nfsrv_dolocallocks;
  72
  73 SYSCTL_DECL(_vfs_newnfs);
  74 SYSCTL_INT(_vfs_newnfs, OID_AUTO, mirrormnt, CTLFLAG_RW, &enable_crossmntpt,
  75     0, "Enable nfsd to cross mount points");
  76 SYSCTL_INT(_vfs_newnfs, OID_AUTO, commit_blks, CTLFLAG_RW, &nfs_commit_blks,
  77     0, "");
  78 SYSCTL_INT(_vfs_newnfs, OID_AUTO, commit_miss, CTLFLAG_RW, &nfs_commit_miss,
  79     0, "");
  80 SYSCTL_INT(_vfs_newnfs, OID_AUTO, issue_delegations, CTLFLAG_RW,
  81     &nfsrv_issuedelegs, 0, "Enable nfsd to issue delegations");
  82 SYSCTL_INT(_vfs_newnfs, OID_AUTO, enable_locallocks, CTLFLAG_RW,
  83     &nfsrv_dolocallocks, 0, "Enable nfsd to acquire local locks on files");
  84
  85 #define NUM_HEURISTIC           1017
  86 #define NHUSE_INIT              64
  87 #define NHUSE_INC               16
  88 #define NHUSE_MAX               2048
  89
  90 static struct nfsheur {
  91         struct vnode *nh_vp;    /* vp to match (unreferenced pointer) */
  92         off_t nh_nextr;         /* next offset for sequential detection */
  93         int nh_use;             /* use count for selection */
  94         int nh_seqcount;        /* heuristic */
  95 } nfsheur[NUM_HEURISTIC];
  96
  97
  98 /*
  99  * Get attributes into nfsvattr structure.
 100  */
 101 int
 102 nfsvno_getattr(struct vnode *vp, struct nfsvattr *nvap, struct ucred *cred,
 103     struct thread *p)
 104 {
 105         int error, lockedit = 0;
 106
 107         /* Since FreeBSD insists the vnode be locked... */
 108         if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
 109                 lockedit = 1;
 110                 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY, p);
 111         }
 112         error = VOP_GETATTR(vp, &nvap->na_vattr, cred);
 113         if (lockedit)
 114                 NFSVOPUNLOCK(vp, 0, p);
 115         return (error);
 116 }
 117
 118 /*
 119  * Get a file handle for a vnode.
 120  */
 121 int
 122 nfsvno_getfh(struct vnode *vp, fhandle_t *fhp, struct thread *p)
 123 {
 124         int error;
 125
 126         NFSBZERO((caddr_t)fhp, sizeof(fhandle_t));
 127         fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid;
 128         error = VOP_VPTOFH(vp, &fhp->fh_fid);
 129         return (error);
 130 }
 131
 132 /*
 133  * Perform access checking for vnodes obtained from file handles that would
 134  * refer to files already opened by a Unix client. You cannot just use
 135  * vn_writechk() and VOP_ACCESSX() for two reasons.
 136  * 1 - You must check for exported rdonly as well as MNT_RDONLY for the write
 137  *     case.
 138  * 2 - The owner is to be given access irrespective of mode bits for some
 139  *     operations, so that processes that chmod after opening a file don't
 140  *     break.
 141  */
 142 int
 143 nfsvno_accchk(struct vnode *vp, accmode_t accmode, struct ucred *cred,
 144     struct nfsexstuff *exp, struct thread *p, int override, int vpislocked,
 145     u_int32_t *supportedtypep)
 146 {
 147         struct vattr vattr;
 148         int error = 0, getret = 0;
 149
 150         if (accmode & VWRITE) {
 151                 /* Just vn_writechk() changed to check rdonly */
 152                 /*
 153                  * Disallow write attempts on read-only file systems;
 154                  * unless the file is a socket or a block or character
 155                  * device resident on the file system.
 156                  */
 157                 if (NFSVNO_EXRDONLY(exp) ||
 158                     (vp->v_mount->mnt_flag & MNT_RDONLY)) {
 159                         switch (vp->v_type) {
 160                         case VREG:
 161                         case VDIR:
 162                         case VLNK:
 163                                 return (EROFS);
 164                         default:
 165                                 break;
 166                         }
 167                 }
 168                 /*
 169                  * If there's shared text associated with
 170                  * the inode, try to free it up once.  If
 171                  * we fail, we can't allow writing.
 172                  */
 173                 if (vp->v_vflag & VV_TEXT)
 174                         return (ETXTBSY);
 175         }
 176         if (vpislocked == 0)
 177                 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY, p);
 178
 179         /*
 180          * Should the override still be applied when ACLs are enabled?
 181          */
 182         error = VOP_ACCESSX(vp, accmode, cred, p);
 183         if (error != 0 && (accmode & (VDELETE | VDELETE_CHILD))) {
 184                 /*
 185                  * Try again with VEXPLICIT_DENY, to see if the test for
 186                  * deletion is supported.
 187                  */
 188                 error = VOP_ACCESSX(vp, accmode | VEXPLICIT_DENY, cred, p);
 189                 if (error == 0) {
 190                         if (vp->v_type == VDIR) {
 191                                 accmode &= ~(VDELETE | VDELETE_CHILD);
 192                                 accmode |= VWRITE;
 193                                 error = VOP_ACCESSX(vp, accmode, cred, p);
 194                         } else if (supportedtypep != NULL) {
 195                                 *supportedtypep &= ~NFSACCESS_DELETE;
 196                         }
 197                 }
 198         }
 199
 200         /*
 201          * Allow certain operations for the owner (reads and writes
 202          * on files that are already open).
 203          */
 204         if (override != NFSACCCHK_NOOVERRIDE &&
 205             (error == EPERM || error == EACCES)) {
 206                 if (cred->cr_uid == 0 && (override & NFSACCCHK_ALLOWROOT))
 207                         error = 0;
 208                 else if (override & NFSACCCHK_ALLOWOWNER) {
 209                         getret = VOP_GETATTR(vp, &vattr, cred);
 210                         if (getret == 0 && cred->cr_uid == vattr.va_uid)
 211                                 error = 0;
 212                 }
 213         }
 214         if (vpislocked == 0)
 215                 NFSVOPUNLOCK(vp, 0, p);
 216         return (error);
 217 }
 218
 219 /*
 220  * Set attribute(s) vnop.
 221  */
 222 int
 223 nfsvno_setattr(struct vnode *vp, struct nfsvattr *nvap, struct ucred *cred,
 224     struct thread *p, struct nfsexstuff *exp)
 225 {
 226         int error;
 227
 228         error = VOP_SETATTR(vp, &nvap->na_vattr, cred);
 229         return (error);
 230 }
 231
 232 /*
 233  * Set up nameidata for a lookup() call and do it
 234  * For the cases where we are crossing mount points
 235  * (looking up the public fh path or the v4 root path when
 236  *  not using a pseudo-root fs), set/release the Giant lock,
 237  * as required.
 238  */
 239 int
 240 nfsvno_namei(struct nfsrv_descript *nd, struct nameidata *ndp,
 241     struct vnode *dp, int islocked, struct nfsexstuff *exp, struct thread *p,
 242     struct vnode **retdirp)
 243 {
 244         struct componentname *cnp = &ndp->ni_cnd;
 245         int i;
 246         struct iovec aiov;
 247         struct uio auio;
 248         int lockleaf = (cnp->cn_flags & LOCKLEAF) != 0, linklen;
 249         int error = 0, crossmnt;
 250         char *cp;
 251
 252         *retdirp = NULL;
 253         cnp->cn_nameptr = cnp->cn_pnbuf;
 254         /*
 255          * Extract and set starting directory.
 256          */
 257         if (dp->v_type != VDIR) {
 258                 if (islocked)
 259                         vput(dp);
 260                 else
 261                         vrele(dp);
 262                 nfsvno_relpathbuf(ndp);
 263                 return (ENOTDIR);
 264         }
 265         if (islocked)
 266                 NFSVOPUNLOCK(dp, 0, p);
 267         VREF(dp);
 268         *retdirp = dp;
 269         if (NFSVNO_EXRDONLY(exp))
 270                 cnp->cn_flags |= RDONLY;
 271         ndp->ni_segflg = UIO_SYSSPACE;
 272         crossmnt = 1;
 273
 274         if (nd->nd_flag & ND_PUBLOOKUP) {
 275                 ndp->ni_loopcnt = 0;
 276                 if (cnp->cn_pnbuf[0] == '/') {
 277                         vrele(dp);
 278                         /*
 279                          * Check for degenerate pathnames here, since lookup()
 280                          * panics on them.
 281                          */
 282                         for (i = 1; i < ndp->ni_pathlen; i++)
 283                                 if (cnp->cn_pnbuf[i] != '/')
 284                                         break;
 285                         if (i == ndp->ni_pathlen) {
 286                                 error = NFSERR_ACCES;
 287                                 goto out;
 288                         }
 289                         dp = rootvnode;
 290                         VREF(dp);
 291                 }
 292         } else if ((enable_crossmntpt == 0 && NFSVNO_EXPORTED(exp)) ||
 293             (nd->nd_flag & ND_NFSV4) == 0) {
 294                 /*
 295                  * Only cross mount points for NFSv4 when doing a
 296                  * mount while traversing the file system above
 297                  * the mount point, unless enable_crossmntpt is set.
 298                  */
 299                 cnp->cn_flags |= NOCROSSMOUNT;
 300                 crossmnt = 0;
 301         }
 302
 303         /*
 304          * Initialize for scan, set ni_startdir and bump ref on dp again
 305          * becuase lookup() will dereference ni_startdir.
 306          */
 307
 308         cnp->cn_thread = p;
 309         ndp->ni_startdir = dp;
 310         ndp->ni_rootdir = rootvnode;
 311
 312         if (!lockleaf)
 313                 cnp->cn_flags |= LOCKLEAF;
 314         for (;;) {
 315                 cnp->cn_nameptr = cnp->cn_pnbuf;
 316                 /*
 317                  * Call lookup() to do the real work.  If an error occurs,
 318                  * ndp->ni_vp and ni_dvp are left uninitialized or NULL and
 319                  * we do not have to dereference anything before returning.
 320                  * In either case ni_startdir will be dereferenced and NULLed
 321                  * out.
 322                  */
 323                 if (exp->nes_vfslocked)
 324                         ndp->ni_cnd.cn_flags |= GIANTHELD;
 325                 error = lookup(ndp);
 326                 /*
 327                  * The Giant lock should only change when
 328                  * crossing mount points.
 329                  */
 330                 if (crossmnt) {
 331                         exp->nes_vfslocked =
 332                             (ndp->ni_cnd.cn_flags & GIANTHELD) != 0;
 333                         ndp->ni_cnd.cn_flags &= ~GIANTHELD;
 334                 }
 335                 if (error)
 336                         break;
 337
 338                 /*
 339                  * Check for encountering a symbolic link.  Trivial
 340                  * termination occurs if no symlink encountered.
 341                  */
 342                 if ((cnp->cn_flags & ISSYMLINK) == 0) {
 343                         if ((cnp->cn_flags & (SAVENAME | SAVESTART)) == 0)
 344                                 nfsvno_relpathbuf(ndp);
 345                         if (ndp->ni_vp && !lockleaf)
 346                                 NFSVOPUNLOCK(ndp->ni_vp, 0, p);
 347                         break;
 348                 }
 349
 350                 /*
 351                  * Validate symlink
 352                  */
 353                 if ((cnp->cn_flags & LOCKPARENT) && ndp->ni_pathlen == 1)
 354                         NFSVOPUNLOCK(ndp->ni_dvp, 0, p);
 355                 if (!(nd->nd_flag & ND_PUBLOOKUP)) {
 356                         error = EINVAL;
 357                         goto badlink2;
 358                 }
 359
 360                 if (ndp->ni_loopcnt++ >= MAXSYMLINKS) {
 361                         error = ELOOP;
 362                         goto badlink2;
 363                 }
 364                 if (ndp->ni_pathlen > 1)
 365                         cp = uma_zalloc(namei_zone, M_WAITOK);
 366                 else
 367                         cp = cnp->cn_pnbuf;
 368                 aiov.iov_base = cp;
 369                 aiov.iov_len = MAXPATHLEN;
 370                 auio.uio_iov = &aiov;
 371                 auio.uio_iovcnt = 1;
 372                 auio.uio_offset = 0;
 373                 auio.uio_rw = UIO_READ;
 374                 auio.uio_segflg = UIO_SYSSPACE;
 375                 auio.uio_td = NULL;
 376                 auio.uio_resid = MAXPATHLEN;
 377                 error = VOP_READLINK(ndp->ni_vp, &auio, cnp->cn_cred);
 378                 if (error) {
 379                 badlink1:
 380                         if (ndp->ni_pathlen > 1)
 381                                 uma_zfree(namei_zone, cp);
 382                 badlink2:
 383                         vrele(ndp->ni_dvp);
 384                         vput(ndp->ni_vp);
 385                         break;
 386                 }
 387                 linklen = MAXPATHLEN - auio.uio_resid;
 388                 if (linklen == 0) {
 389                         error = ENOENT;
 390                         goto badlink1;
 391                 }
 392                 if (linklen + ndp->ni_pathlen >= MAXPATHLEN) {
 393                         error = ENAMETOOLONG;
 394                         goto badlink1;
 395                 }
 396
 397                 /*
 398                  * Adjust or replace path
 399                  */
 400                 if (ndp->ni_pathlen > 1) {
 401                         NFSBCOPY(ndp->ni_next, cp + linklen, ndp->ni_pathlen);
 402                         uma_zfree(namei_zone, cnp->cn_pnbuf);
 403                         cnp->cn_pnbuf = cp;
 404                 } else
 405                         cnp->cn_pnbuf[linklen] = '\0';
 406                 ndp->ni_pathlen += linklen;
 407
 408                 /*
 409                  * Cleanup refs for next loop and check if root directory
 410                  * should replace current directory.  Normally ni_dvp
 411                  * becomes the new base directory and is cleaned up when
 412                  * we loop.  Explicitly null pointers after invalidation
 413                  * to clarify operation.
 414                  */
 415                 vput(ndp->ni_vp);
 416                 ndp->ni_vp = NULL;
 417
 418                 if (cnp->cn_pnbuf[0] == '/') {
 419                         vrele(ndp->ni_dvp);
 420                         ndp->ni_dvp = ndp->ni_rootdir;
 421                         VREF(ndp->ni_dvp);
 422                 }
 423                 ndp->ni_startdir = ndp->ni_dvp;
 424                 ndp->ni_dvp = NULL;
 425         }
 426         if (!lockleaf)
 427                 cnp->cn_flags &= ~LOCKLEAF;
 428
 429 out:
 430         if (error) {
 431                 uma_zfree(namei_zone, cnp->cn_pnbuf);
 432                 ndp->ni_vp = NULL;
 433                 ndp->ni_dvp = NULL;
 434                 ndp->ni_startdir = NULL;
 435                 cnp->cn_flags &= ~HASBUF;
 436         } else if ((ndp->ni_cnd.cn_flags & (WANTPARENT|LOCKPARENT)) == 0) {
 437                 ndp->ni_dvp = NULL;
 438         }
 439         return (error);
 440 }
 441
 442 /*
 443  * Set up a pathname buffer and return a pointer to it and, optionally
 444  * set a hash pointer.
 445  */
 446 void
 447 nfsvno_setpathbuf(struct nameidata *ndp, char **bufpp, u_long **hashpp)
 448 {
 449         struct componentname *cnp = &ndp->ni_cnd;
 450
 451         cnp->cn_flags |= (NOMACCHECK | HASBUF);
 452         cnp->cn_pnbuf = uma_zalloc(namei_zone, M_WAITOK);
 453         if (hashpp != NULL)
 454                 *hashpp = NULL;
 455         *bufpp = cnp->cn_pnbuf;
 456 }
 457
 458 /*
 459  * Release the above path buffer, if not released by nfsvno_namei().
 460  */
 461 void
 462 nfsvno_relpathbuf(struct nameidata *ndp)
 463 {
 464
 465         if ((ndp->ni_cnd.cn_flags & HASBUF) == 0)
 466                 panic("nfsrelpath");
 467         uma_zfree(namei_zone, ndp->ni_cnd.cn_pnbuf);
 468         ndp->ni_cnd.cn_flags &= ~HASBUF;
 469 }
 470
 471 /*
 472  * Readlink vnode op into an mbuf list.
 473  */
 474 int
 475 nfsvno_readlink(struct vnode *vp, struct ucred *cred, struct thread *p,
 476     struct mbuf **mpp, struct mbuf **mpendp, int *lenp)
 477 {
 478         struct iovec iv[(NFS_MAXPATHLEN+MLEN-1)/MLEN];
 479         struct iovec *ivp = iv;
 480         struct uio io, *uiop = &io;
 481         struct mbuf *mp, *mp2 = NULL, *mp3 = NULL;
 482         int i, len, tlen, error;
 483
 484         len = 0;
 485         i = 0;
 486         while (len < NFS_MAXPATHLEN) {
 487                 NFSMGET(mp);
 488                 MCLGET(mp, M_WAIT);
 489                 mp->m_len = NFSMSIZ(mp);
 490                 if (len == 0) {
 491                         mp3 = mp2 = mp;
 492                 } else {
 493                         mp2->m_next = mp;
 494                         mp2 = mp;
 495                 }
 496                 if ((len + mp->m_len) > NFS_MAXPATHLEN) {
 497                         mp->m_len = NFS_MAXPATHLEN - len;
 498                         len = NFS_MAXPATHLEN;
 499                 } else {
 500                         len += mp->m_len;
 501                 }
 502                 ivp->iov_base = mtod(mp, caddr_t);
 503                 ivp->iov_len = mp->m_len;
 504                 i++;
 505                 ivp++;
 506         }
 507         uiop->uio_iov = iv;
 508         uiop->uio_iovcnt = i;
 509         uiop->uio_offset = 0;
 510         uiop->uio_resid = len;
 511         uiop->uio_rw = UIO_READ;
 512         uiop->uio_segflg = UIO_SYSSPACE;
 513         uiop->uio_td = NULL;
 514         error = VOP_READLINK(vp, uiop, cred);
 515         if (error) {
 516                 m_freem(mp3);
 517                 *lenp = 0;
 518                 return (error);
 519         }
 520         if (uiop->uio_resid > 0) {
 521                 len -= uiop->uio_resid;
 522                 tlen = NFSM_RNDUP(len);
 523                 nfsrv_adj(mp3, NFS_MAXPATHLEN - tlen, tlen - len);
 524         }
 525         *lenp = len;
 526         *mpp = mp3;
 527         *mpendp = mp;
 528         return (0);
 529 }
 530
 531 /*
 532  * Read vnode op call into mbuf list.
 533  */
 534 int
 535 nfsvno_read(struct vnode *vp, off_t off, int cnt, struct ucred *cred,
 536     struct thread *p, struct mbuf **mpp, struct mbuf **mpendp)
 537 {
 538         struct mbuf *m;
 539         int i;
 540         struct iovec *iv;
 541         struct iovec *iv2;
 542         int error = 0, len, left, siz, tlen, ioflag = 0, hi, try = 32;
 543         struct mbuf *m2 = NULL, *m3;
 544         struct uio io, *uiop = &io;
 545         struct nfsheur *nh;
 546
 547         /*
 548          * Calculate seqcount for heuristic
 549          */
 550         /*
 551          * Locate best candidate
 552          */
 553
 554         hi = ((int)(vm_offset_t)vp / sizeof(struct vnode)) % NUM_HEURISTIC;
 555         nh = &nfsheur[hi];
 556
 557         while (try--) {
 558                 if (nfsheur[hi].nh_vp == vp) {
 559                         nh = &nfsheur[hi];
 560                         break;
 561                 }
 562                 if (nfsheur[hi].nh_use > 0)
 563                         --nfsheur[hi].nh_use;
 564                 hi = (hi + 1) % NUM_HEURISTIC;
 565                 if (nfsheur[hi].nh_use < nh->nh_use)
 566                         nh = &nfsheur[hi];
 567         }
 568
 569         if (nh->nh_vp != vp) {
 570                 nh->nh_vp = vp;
 571                 nh->nh_nextr = off;
 572                 nh->nh_use = NHUSE_INIT;
 573                 if (off == 0)
 574                         nh->nh_seqcount = 4;
 575                 else
 576                         nh->nh_seqcount = 1;
 577         }
 578
 579         /*
 580          * Calculate heuristic
 581          */
 582
 583         if ((off == 0 && nh->nh_seqcount > 0) || off == nh->nh_nextr) {
 584                 if (++nh->nh_seqcount > IO_SEQMAX)
 585                         nh->nh_seqcount = IO_SEQMAX;
 586         } else if (nh->nh_seqcount > 1) {
 587                 nh->nh_seqcount = 1;
 588         } else {
 589                 nh->nh_seqcount = 0;
 590         }
 591         nh->nh_use += NHUSE_INC;
 592         if (nh->nh_use > NHUSE_MAX)
 593                 nh->nh_use = NHUSE_MAX;
 594         ioflag |= nh->nh_seqcount << IO_SEQSHIFT;
 595
 596         len = left = NFSM_RNDUP(cnt);
 597         m3 = NULL;
 598         /*
 599          * Generate the mbuf list with the uio_iov ref. to it.
 600          */
 601         i = 0;
 602         while (left > 0) {
 603                 NFSMGET(m);
 604                 MCLGET(m, M_WAIT);
 605                 m->m_len = 0;
 606                 siz = min(M_TRAILINGSPACE(m), left);
 607                 left -= siz;
 608                 i++;
 609                 if (m3)
 610                         m2->m_next = m;
 611                 else
 612                         m3 = m;
 613                 m2 = m;
 614         }
 615         MALLOC(iv, struct iovec *, i * sizeof (struct iovec),
 616             M_TEMP, M_WAITOK);
 617         uiop->uio_iov = iv2 = iv;
 618         m = m3;
 619         left = len;
 620         i = 0;
 621         while (left > 0) {
 622                 if (m == NULL)
 623                         panic("nfsvno_read iov");
 624                 siz = min(M_TRAILINGSPACE(m), left);
 625                 if (siz > 0) {
 626                         iv->iov_base = mtod(m, caddr_t) + m->m_len;
 627                         iv->iov_len = siz;
 628                         m->m_len += siz;
 629                         left -= siz;
 630                         iv++;
 631                         i++;
 632                 }
 633                 m = m->m_next;
 634         }
 635         uiop->uio_iovcnt = i;
 636         uiop->uio_offset = off;
 637         uiop->uio_resid = len;
 638         uiop->uio_rw = UIO_READ;
 639         uiop->uio_segflg = UIO_SYSSPACE;
 640         error = VOP_READ(vp, uiop, IO_NODELOCKED | ioflag, cred);
 641         FREE((caddr_t)iv2, M_TEMP);
 642         if (error) {
 643                 m_freem(m3);
 644                 *mpp = NULL;
 645                 return (error);
 646         }
 647         tlen = len - uiop->uio_resid;
 648         cnt = cnt < tlen ? cnt : tlen;
 649         tlen = NFSM_RNDUP(cnt);
 650         if (tlen == 0) {
 651                 m_freem(m3);
 652                 m3 = NULL;
 653         } else if (len != tlen || tlen != cnt)
 654                 nfsrv_adj(m3, len - tlen, tlen - cnt);
 655         *mpp = m3;
 656         *mpendp = m2;
 657         return (0);
 658 }
 659
 660 /*
 661  * Write vnode op from an mbuf list.
 662  */
 663 int
 664 nfsvno_write(struct vnode *vp, off_t off, int retlen, int cnt, int stable,
 665     struct mbuf *mp, char *cp, struct ucred *cred, struct thread *p)
 666 {
 667         struct iovec *ivp;
 668         int i, len;
 669         struct iovec *iv;
 670         int ioflags, error;
 671         struct uio io, *uiop = &io;
 672
 673         MALLOC(ivp, struct iovec *, cnt * sizeof (struct iovec), M_TEMP,
 674             M_WAITOK);
 675         uiop->uio_iov = iv = ivp;
 676         uiop->uio_iovcnt = cnt;
 677         i = mtod(mp, caddr_t) + mp->m_len - cp;
 678         len = retlen;
 679         while (len > 0) {
 680                 if (mp == NULL)
 681                         panic("nfsvno_write");
 682                 if (i > 0) {
 683                         i = min(i, len);
 684                         ivp->iov_base = cp;
 685                         ivp->iov_len = i;
 686                         ivp++;
 687                         len -= i;
 688                 }
 689                 mp = mp->m_next;
 690                 if (mp) {
 691                         i = mp->m_len;
 692                         cp = mtod(mp, caddr_t);
 693                 }
 694         }
 695
 696         if (stable == NFSWRITE_UNSTABLE)
 697                 ioflags = IO_NODELOCKED;
 698         else
 699                 ioflags = (IO_SYNC | IO_NODELOCKED);
 700         uiop->uio_resid = retlen;
 701         uiop->uio_rw = UIO_WRITE;
 702         uiop->uio_segflg = UIO_SYSSPACE;
 703         NFSUIOPROC(uiop, p);
 704         uiop->uio_offset = off;
 705         error = VOP_WRITE(vp, uiop, ioflags, cred);
 706         FREE((caddr_t)iv, M_TEMP);
 707         return (error);
 708 }
 709
 710 /*
 711  * Common code for creating a regular file (plus special files for V2).
 712  */
 713 int
 714 nfsvno_createsub(struct nfsrv_descript *nd, struct nameidata *ndp,
 715     struct vnode **vpp, struct nfsvattr *nvap, int *exclusive_flagp,
 716     int32_t *cverf, NFSDEV_T rdev, struct thread *p, struct nfsexstuff *exp)
 717 {
 718         u_quad_t tempsize;
 719         int error;
 720
 721         error = nd->nd_repstat;
 722         if (!error && ndp->ni_vp == NULL) {
 723                 if (nvap->na_type == VREG || nvap->na_type == VSOCK) {
 724                         vrele(ndp->ni_startdir);
 725                         error = VOP_CREATE(ndp->ni_dvp,
 726                             &ndp->ni_vp, &ndp->ni_cnd, &nvap->na_vattr);
 727                         vput(ndp->ni_dvp);
 728                         nfsvno_relpathbuf(ndp);
 729                         if (!error) {
 730                                 if (*exclusive_flagp) {
 731                                         *exclusive_flagp = 0;
 732                                         NFSVNO_ATTRINIT(nvap);
 733                                         nvap->na_atime.tv_sec = cverf[0];
 734                                         nvap->na_atime.tv_nsec = cverf[1];
 735                                         error = VOP_SETATTR(ndp->ni_vp,
 736                                             &nvap->na_vattr, nd->nd_cred);
 737                                 }
 738                         }
 739                 /*
 740                  * NFS V2 Only. nfsrvd_mknod() does this for V3.
 741                  * (This implies, just get out on an error.)
 742                  */
 743                 } else if (nvap->na_type == VCHR || nvap->na_type == VBLK ||
 744                         nvap->na_type == VFIFO) {
 745                         if (nvap->na_type == VCHR && rdev == 0xffffffff)
 746                                 nvap->na_type = VFIFO;
 747                         if (nvap->na_type != VFIFO &&
 748                             (error = priv_check_cred(nd->nd_cred,
 749                              PRIV_VFS_MKNOD_DEV, 0))) {
 750                                 vrele(ndp->ni_startdir);
 751                                 nfsvno_relpathbuf(ndp);
 752                                 vput(ndp->ni_dvp);
 753                                 return (error);
 754                         }
 755                         nvap->na_rdev = rdev;
 756                         error = VOP_MKNOD(ndp->ni_dvp, &ndp->ni_vp,
 757                             &ndp->ni_cnd, &nvap->na_vattr);
 758                         vput(ndp->ni_dvp);
 759                         nfsvno_relpathbuf(ndp);
 760                         if (error) {
 761                                 vrele(ndp->ni_startdir);
 762                                 return (error);
 763                         }
 764                 } else {
 765                         vrele(ndp->ni_startdir);
 766                         nfsvno_relpathbuf(ndp);
 767                         vput(ndp->ni_dvp);
 768                         return (ENXIO);
 769                 }
 770                 *vpp = ndp->ni_vp;
 771         } else {
 772                 /*
 773                  * Handle cases where error is already set and/or
 774                  * the file exists.
 775                  * 1 - clean up the lookup
 776                  * 2 - iff !error and na_size set, truncate it
 777                  */
 778                 vrele(ndp->ni_startdir);
 779                 nfsvno_relpathbuf(ndp);
 780                 *vpp = ndp->ni_vp;
 781                 if (ndp->ni_dvp == *vpp)
 782                         vrele(ndp->ni_dvp);
 783                 else
 784                         vput(ndp->ni_dvp);
 785                 if (!error && nvap->na_size != VNOVAL) {
 786                         error = nfsvno_accchk(*vpp, VWRITE,
 787                             nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
 788                             NFSACCCHK_VPISLOCKED, NULL);
 789                         if (!error) {
 790                                 tempsize = nvap->na_size;
 791                                 NFSVNO_ATTRINIT(nvap);
 792                                 nvap->na_size = tempsize;
 793                                 error = VOP_SETATTR(*vpp,
 794                                     &nvap->na_vattr, nd->nd_cred);
 795                         }
 796                 }
 797                 if (error)
 798                         vput(*vpp);
 799         }
 800         return (error);
 801 }
 802
 803 /*
 804  * Do a mknod vnode op.
 805  */
 806 int
 807 nfsvno_mknod(struct nameidata *ndp, struct nfsvattr *nvap, struct ucred *cred,
 808     struct thread *p)
 809 {
 810         int error = 0;
 811         enum vtype vtyp;
 812
 813         vtyp = nvap->na_type;
 814         /*
 815          * Iff doesn't exist, create it.
 816          */
 817         if (ndp->ni_vp) {
 818                 vrele(ndp->ni_startdir);
 819                 nfsvno_relpathbuf(ndp);
 820                 vput(ndp->ni_dvp);
 821                 vrele(ndp->ni_vp);
 822                 return (EEXIST);
 823         }
 824         if (vtyp != VCHR && vtyp != VBLK && vtyp != VSOCK && vtyp != VFIFO) {
 825                 vrele(ndp->ni_startdir);
 826                 nfsvno_relpathbuf(ndp);
 827                 vput(ndp->ni_dvp);
 828                 return (NFSERR_BADTYPE);
 829         }
 830         if (vtyp == VSOCK) {
 831                 vrele(ndp->ni_startdir);
 832                 error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp,
 833                     &ndp->ni_cnd, &nvap->na_vattr);
 834                 vput(ndp->ni_dvp);
 835                 nfsvno_relpathbuf(ndp);
 836         } else {
 837                 if (nvap->na_type != VFIFO &&
 838                     (error = priv_check_cred(cred, PRIV_VFS_MKNOD_DEV, 0))) {
 839                         vrele(ndp->ni_startdir);
 840                         nfsvno_relpathbuf(ndp);
 841                         vput(ndp->ni_dvp);
 842                         return (error);
 843                 }
 844                 error = VOP_MKNOD(ndp->ni_dvp, &ndp->ni_vp,
 845                     &ndp->ni_cnd, &nvap->na_vattr);
 846                 vput(ndp->ni_dvp);
 847                 nfsvno_relpathbuf(ndp);
 848                 if (error)
 849                         vrele(ndp->ni_startdir);
 850                 /*
 851                  * Since VOP_MKNOD returns the ni_vp, I can't
 852                  * see any reason to do the lookup.
 853                  */
 854         }
 855         return (error);
 856 }
 857
 858 /*
 859  * Mkdir vnode op.
 860  */
 861 int
 862 nfsvno_mkdir(struct nameidata *ndp, struct nfsvattr *nvap, uid_t saved_uid,
 863     struct ucred *cred, struct thread *p, struct nfsexstuff *exp)
 864 {
 865         int error = 0;
 866
 867         if (ndp->ni_vp != NULL) {
 868                 if (ndp->ni_dvp == ndp->ni_vp)
 869                         vrele(ndp->ni_dvp);
 870                 else
 871                         vput(ndp->ni_dvp);
 872                 vrele(ndp->ni_vp);
 873                 nfsvno_relpathbuf(ndp);
 874                 return (EEXIST);
 875         }
 876         error = VOP_MKDIR(ndp->ni_dvp, &ndp->ni_vp, &ndp->ni_cnd,
 877             &nvap->na_vattr);
 878         vput(ndp->ni_dvp);
 879         nfsvno_relpathbuf(ndp);
 880         return (error);
 881 }
 882
 883 /*
 884  * symlink vnode op.
 885  */
 886 int
 887 nfsvno_symlink(struct nameidata *ndp, struct nfsvattr *nvap, char *pathcp,
 888     int pathlen, int not_v2, uid_t saved_uid, struct ucred *cred, struct thread *p,
 889     struct nfsexstuff *exp)
 890 {
 891         int error = 0;
 892
 893         if (ndp->ni_vp) {
 894                 vrele(ndp->ni_startdir);
 895                 nfsvno_relpathbuf(ndp);
 896                 if (ndp->ni_dvp == ndp->ni_vp)
 897                         vrele(ndp->ni_dvp);
 898                 else
 899                         vput(ndp->ni_dvp);
 900                 vrele(ndp->ni_vp);
 901                 return (EEXIST);
 902         }
 903
 904         error = VOP_SYMLINK(ndp->ni_dvp, &ndp->ni_vp, &ndp->ni_cnd,
 905             &nvap->na_vattr, pathcp);
 906         vput(ndp->ni_dvp);
 907         vrele(ndp->ni_startdir);
 908         nfsvno_relpathbuf(ndp);
 909         /*
 910          * Although FreeBSD still had the lookup code in
 911          * it for 7/current, there doesn't seem to be any
 912          * point, since VOP_SYMLINK() returns the ni_vp.
 913          * Just vput it for v2.
 914          */
 915         if (!not_v2 && !error)
 916                 vput(ndp->ni_vp);
 917         return (error);
 918 }
 919
 920 /*
 921  * Parse symbolic link arguments.
 922  * This function has an ugly side effect. It will MALLOC() an area for
 923  * the symlink and set iov_base to point to it, only if it succeeds.
 924  * So, if it returns with uiop->uio_iov->iov_base != NULL, that must
 925  * be FREE'd later.
 926  */
 927 int
 928 nfsvno_getsymlink(struct nfsrv_descript *nd, struct nfsvattr *nvap,
 929     struct thread *p, char **pathcpp, int *lenp)
 930 {
 931         u_int32_t *tl;
 932         char *pathcp = NULL;
 933         int error = 0, len;
 934         struct nfsv2_sattr *sp;
 935
 936         *pathcpp = NULL;
 937         *lenp = 0;
 938         if ((nd->nd_flag & ND_NFSV3) &&
 939             (error = nfsrv_sattr(nd, nvap, NULL, NULL, p)))
 940                 goto nfsmout;
 941         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 942         len = fxdr_unsigned(int, *tl);
 943         if (len > NFS_MAXPATHLEN || len <= 0) {
 944                 error = EBADRPC;
 945                 goto nfsmout;
 946         }
 947         MALLOC(pathcp, caddr_t, len + 1, M_TEMP, M_WAITOK);
 948         error = nfsrv_mtostr(nd, pathcp, len);
 949         if (error)
 950                 goto nfsmout;
 951         if (nd->nd_flag & ND_NFSV2) {
 952                 NFSM_DISSECT(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
 953                 nvap->na_mode = fxdr_unsigned(u_int16_t, sp->sa_mode);
 954         }
 955         *pathcpp = pathcp;
 956         *lenp = len;
 957         return (0);
 958 nfsmout:
 959         if (pathcp)
 960                 free(pathcp, M_TEMP);
 961         return (error);
 962 }
 963
 964 /*
 965  * Remove a non-directory object.
 966  */
 967 int
 968 nfsvno_removesub(struct nameidata *ndp, int is_v4, struct ucred *cred,
 969     struct thread *p, struct nfsexstuff *exp)
 970 {
 971         struct vnode *vp;
 972         int error = 0;
 973
 974         vp = ndp->ni_vp;
 975         if (vp->v_type == VDIR)
 976                 error = NFSERR_ISDIR;
 977         else if (is_v4)
 978                 error = nfsrv_checkremove(vp, 1, p);
 979         if (!error)
 980                 error = VOP_REMOVE(ndp->ni_dvp, vp, &ndp->ni_cnd);
 981         if (ndp->ni_dvp == vp)
 982                 vrele(ndp->ni_dvp);
 983         else
 984                 vput(ndp->ni_dvp);
 985         vput(vp);
 986         return (error);
 987 }
 988
 989 /*
 990  * Remove a directory.
 991  */
 992 int
 993 nfsvno_rmdirsub(struct nameidata *ndp, int is_v4, struct ucred *cred,
 994     struct thread *p, struct nfsexstuff *exp)
 995 {
 996         struct vnode *vp;
 997         int error = 0;
 998
 999         vp = ndp->ni_vp;
1000         if (vp->v_type != VDIR) {
1001                 error = ENOTDIR;
1002                 goto out;
1003         }
1004         /*
1005          * No rmdir "." please.
1006          */
1007         if (ndp->ni_dvp == vp) {
1008                 error = EINVAL;
1009                 goto out;
1010         }
1011         /*
1012          * The root of a mounted filesystem cannot be deleted.
1013          */
1014         if (vp->v_vflag & VV_ROOT)
1015                 error = EBUSY;
1016 out:
1017         if (!error)
1018                 error = VOP_RMDIR(ndp->ni_dvp, vp, &ndp->ni_cnd);
1019         if (ndp->ni_dvp == vp)
1020                 vrele(ndp->ni_dvp);
1021         else
1022                 vput(ndp->ni_dvp);
1023         vput(vp);
1024         return (error);
1025 }
1026
1027 /*
1028  * Rename vnode op.
1029  */
1030 int
1031 nfsvno_rename(struct nameidata *fromndp, struct nameidata *tondp,
1032     u_int32_t ndstat, u_int32_t ndflag, struct ucred *cred, struct thread *p)
1033 {
1034         struct vnode *fvp, *tvp, *tdvp;
1035         int error = 0;
1036
1037         fvp = fromndp->ni_vp;
1038         if (ndstat) {
1039                 vrele(fromndp->ni_dvp);
1040                 vrele(fvp);
1041                 error = ndstat;
1042                 goto out1;
1043         }
1044         tdvp = tondp->ni_dvp;
1045         tvp = tondp->ni_vp;
1046         if (tvp != NULL) {
1047                 if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
1048                         error = (ndflag & ND_NFSV2) ? EISDIR : EEXIST;
1049                         goto out;
1050                 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
1051                         error = (ndflag & ND_NFSV2) ? ENOTDIR : EEXIST;
1052                         goto out;
1053                 }
1054                 if (tvp->v_type == VDIR && tvp->v_mountedhere) {
1055                         error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
1056                         goto out;
1057                 }
1058
1059                 /*
1060                  * A rename to '.' or '..' results in a prematurely
1061                  * unlocked vnode on FreeBSD5, so I'm just going to fail that
1062                  * here.
1063                  */
1064                 if ((tondp->ni_cnd.cn_namelen == 1 &&
1065                      tondp->ni_cnd.cn_nameptr[0] == '.') ||
1066                     (tondp->ni_cnd.cn_namelen == 2 &&
1067                      tondp->ni_cnd.cn_nameptr[0] == '.' &&
1068                      tondp->ni_cnd.cn_nameptr[1] == '.')) {
1069                         error = EINVAL;
1070                         goto out;
1071                 }
1072         }
1073         if (fvp->v_type == VDIR && fvp->v_mountedhere) {
1074                 error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
1075                 goto out;
1076         }
1077         if (fvp->v_mount != tdvp->v_mount) {
1078                 error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
1079                 goto out;
1080         }
1081         if (fvp == tdvp) {
1082                 error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EINVAL;
1083                 goto out;
1084         }
1085         if (fvp == tvp) {
1086                 /*
1087                  * If source and destination are the same, there is nothing to
1088                  * do. Set error to -1 to indicate this.
1089                  */
1090                 error = -1;
1091                 goto out;
1092         }
1093         if (ndflag & ND_NFSV4) {
1094                 NFSVOPLOCK(fvp, LK_EXCLUSIVE | LK_RETRY, p);
1095                 error = nfsrv_checkremove(fvp, 0, p);
1096                 NFSVOPUNLOCK(fvp, 0, p);
1097                 if (tvp && !error)
1098                         error = nfsrv_checkremove(tvp, 1, p);
1099         } else {
1100                 /*
1101                  * For NFSv2 and NFSv3, try to get rid of the delegation, so
1102                  * that the NFSv4 client won't be confused by the rename.
1103                  * Since nfsd_recalldelegation() can only be called on an
1104                  * unlocked vnode at this point and fvp is the file that will
1105                  * still exist after the rename, just do fvp.
1106                  */
1107                 nfsd_recalldelegation(fvp, p);
1108         }
1109 out:
1110         if (!error) {
1111                 error = VOP_RENAME(fromndp->ni_dvp, fromndp->ni_vp,
1112                     &fromndp->ni_cnd, tondp->ni_dvp, tondp->ni_vp,
1113                     &tondp->ni_cnd);
1114         } else {
1115                 if (tdvp == tvp)
1116                         vrele(tdvp);
1117                 else
1118                         vput(tdvp);
1119                 if (tvp)
1120                         vput(tvp);
1121                 vrele(fromndp->ni_dvp);
1122                 vrele(fvp);
1123                 if (error == -1)
1124                         error = 0;
1125         }
1126         vrele(tondp->ni_startdir);
1127         nfsvno_relpathbuf(tondp);
1128 out1:
1129         vrele(fromndp->ni_startdir);
1130         nfsvno_relpathbuf(fromndp);
1131         return (error);
1132 }
1133
1134 /*
1135  * Link vnode op.
1136  */
1137 int
1138 nfsvno_link(struct nameidata *ndp, struct vnode *vp, struct ucred *cred,
1139     struct thread *p, struct nfsexstuff *exp)
1140 {
1141         struct vnode *xp;
1142         int error = 0;
1143
1144         xp = ndp->ni_vp;
1145         if (xp != NULL) {
1146                 error = EEXIST;
1147         } else {
1148                 xp = ndp->ni_dvp;
1149                 if (vp->v_mount != xp->v_mount)
1150                         error = EXDEV;
1151         }
1152         if (!error) {
1153                 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY, p);
1154                 error = VOP_LINK(ndp->ni_dvp, vp, &ndp->ni_cnd);
1155                 if (ndp->ni_dvp == vp)
1156                         vrele(ndp->ni_dvp);
1157                 else
1158                         vput(ndp->ni_dvp);
1159                 NFSVOPUNLOCK(vp, 0, p);
1160         } else {
1161                 if (ndp->ni_dvp == ndp->ni_vp)
1162                         vrele(ndp->ni_dvp);
1163                 else
1164                         vput(ndp->ni_dvp);
1165                 if (ndp->ni_vp)
1166                         vrele(ndp->ni_vp);
1167         }
1168         nfsvno_relpathbuf(ndp);
1169         return (error);
1170 }
1171
1172 /*
1173  * Do the fsync() appropriate for the commit.
1174  */
1175 int
1176 nfsvno_fsync(struct vnode *vp, u_int64_t off, int cnt, struct ucred *cred,
1177     struct thread *td)
1178 {
1179         int error = 0;
1180
1181         if (cnt > MAX_COMMIT_COUNT) {
1182                 /*
1183                  * Give up and do the whole thing
1184                  */
1185                 if (vp->v_object &&
1186                    (vp->v_object->flags & OBJ_MIGHTBEDIRTY)) {
1187                         VM_OBJECT_LOCK(vp->v_object);
1188                         vm_object_page_clean(vp->v_object, 0, 0, OBJPC_SYNC);
1189                         VM_OBJECT_UNLOCK(vp->v_object);
1190                 }
1191                 error = VOP_FSYNC(vp, MNT_WAIT, td);
1192         } else {
1193                 /*
1194                  * Locate and synchronously write any buffers that fall
1195                  * into the requested range.  Note:  we are assuming that
1196                  * f_iosize is a power of 2.
1197                  */
1198                 int iosize = vp->v_mount->mnt_stat.f_iosize;
1199                 int iomask = iosize - 1;
1200                 struct bufobj *bo;
1201                 daddr_t lblkno;
1202
1203                 /*
1204                  * Align to iosize boundry, super-align to page boundry.
1205                  */
1206                 if (off & iomask) {
1207                         cnt += off & iomask;
1208                         off &= ~(u_quad_t)iomask;
1209                 }
1210                 if (off & PAGE_MASK) {
1211                         cnt += off & PAGE_MASK;
1212                         off &= ~(u_quad_t)PAGE_MASK;
1213                 }
1214                 lblkno = off / iosize;
1215
1216                 if (vp->v_object &&
1217                    (vp->v_object->flags & OBJ_MIGHTBEDIRTY)) {
1218                         VM_OBJECT_LOCK(vp->v_object);
1219                         vm_object_page_clean(vp->v_object, off / PAGE_SIZE, (cnt + PAGE_MASK) / PAGE_SIZE, OBJPC_SYNC);
1220                         VM_OBJECT_UNLOCK(vp->v_object);
1221                 }
1222
1223                 bo = &vp->v_bufobj;
1224                 BO_LOCK(bo);
1225                 while (cnt > 0) {
1226                         struct buf *bp;
1227
1228                         /*
1229                          * If we have a buffer and it is marked B_DELWRI we
1230                          * have to lock and write it.  Otherwise the prior
1231                          * write is assumed to have already been committed.
1232                          *
1233                          * gbincore() can return invalid buffers now so we
1234                          * have to check that bit as well (though B_DELWRI
1235                          * should not be set if B_INVAL is set there could be
1236                          * a race here since we haven't locked the buffer).
1237                          */
1238                         if ((bp = gbincore(&vp->v_bufobj, lblkno)) != NULL) {
1239                                 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_SLEEPFAIL |
1240                                     LK_INTERLOCK, BO_MTX(bo)) == ENOLCK) {
1241                                         BO_LOCK(bo);
1242                                         continue; /* retry */
1243                                 }
1244                                 if ((bp->b_flags & (B_DELWRI|B_INVAL)) ==
1245                                     B_DELWRI) {
1246                                         bremfree(bp);
1247                                         bp->b_flags &= ~B_ASYNC;
1248                                         bwrite(bp);
1249                                         ++nfs_commit_miss;
1250                                 } else
1251                                         BUF_UNLOCK(bp);
1252                                 BO_LOCK(bo);
1253                         }
1254                         ++nfs_commit_blks;
1255                         if (cnt < iosize)
1256                                 break;
1257                         cnt -= iosize;
1258                         ++lblkno;
1259                 }
1260                 BO_UNLOCK(bo);
1261         }
1262         return (error);
1263 }
1264
1265 /*
1266  * Statfs vnode op.
1267  */
1268 int
1269 nfsvno_statfs(struct vnode *vp, struct statfs *sf)
1270 {
1271
1272         return (VFS_STATFS(vp->v_mount, sf));
1273 }
1274
1275 /*
1276  * Do the vnode op stuff for Open. Similar to nfsvno_createsub(), but
1277  * must handle nfsrv_opencheck() calls after any other access checks.
1278  */
1279 void
1280 nfsvno_open(struct nfsrv_descript *nd, struct nameidata *ndp,
1281     nfsquad_t clientid, nfsv4stateid_t *stateidp, struct nfsstate *stp,
1282     int *exclusive_flagp, struct nfsvattr *nvap, int32_t *cverf, int create,
1283     NFSACL_T *aclp, nfsattrbit_t *attrbitp, struct ucred *cred, struct thread *p,
1284     struct nfsexstuff *exp, struct vnode **vpp)
1285 {
1286         struct vnode *vp = NULL;
1287         u_quad_t tempsize;
1288         struct nfsexstuff nes;
1289
1290         if (ndp->ni_vp == NULL)
1291                 nd->nd_repstat = nfsrv_opencheck(clientid,
1292                     stateidp, stp, NULL, nd, p, nd->nd_repstat);
1293         if (!nd->nd_repstat) {
1294                 if (ndp->ni_vp == NULL) {
1295                         vrele(ndp->ni_startdir);
1296                         nd->nd_repstat = VOP_CREATE(ndp->ni_dvp,
1297                             &ndp->ni_vp, &ndp->ni_cnd, &nvap->na_vattr);
1298                         vput(ndp->ni_dvp);
1299                         nfsvno_relpathbuf(ndp);
1300                         if (!nd->nd_repstat) {
1301                                 if (*exclusive_flagp) {
1302                                         *exclusive_flagp = 0;
1303                                         NFSVNO_ATTRINIT(nvap);
1304                                         nvap->na_atime.tv_sec = cverf[0];
1305                                         nvap->na_atime.tv_nsec = cverf[1];
1306                                         nd->nd_repstat = VOP_SETATTR(ndp->ni_vp,
1307                                             &nvap->na_vattr, cred);
1308                                 } else {
1309                                         nfsrv_fixattr(nd, ndp->ni_vp, nvap,
1310                                             aclp, p, attrbitp, exp);
1311                                 }
1312                         }
1313                         vp = ndp->ni_vp;
1314                 } else {
1315                         if (ndp->ni_startdir)
1316                                 vrele(ndp->ni_startdir);
1317                         nfsvno_relpathbuf(ndp);
1318                         vp = ndp->ni_vp;
1319                         if (create == NFSV4OPEN_CREATE) {
1320                                 if (ndp->ni_dvp == vp)
1321                                         vrele(ndp->ni_dvp);
1322                                 else
1323                                         vput(ndp->ni_dvp);
1324                         }
1325                         if (NFSVNO_ISSETSIZE(nvap) && vp->v_type == VREG) {
1326                                 if (ndp->ni_cnd.cn_flags & RDONLY)
1327                                         NFSVNO_SETEXRDONLY(&nes);
1328                                 else
1329                                         NFSVNO_EXINIT(&nes);
1330                                 nd->nd_repstat = nfsvno_accchk(vp,
1331                                     VWRITE, cred, &nes, p,
1332                                     NFSACCCHK_NOOVERRIDE,
1333                                     NFSACCCHK_VPISLOCKED, NULL);
1334                                 nd->nd_repstat = nfsrv_opencheck(clientid,
1335                                     stateidp, stp, vp, nd, p, nd->nd_repstat);
1336                                 if (!nd->nd_repstat) {
1337                                         tempsize = nvap->na_size;
1338                                         NFSVNO_ATTRINIT(nvap);
1339                                         nvap->na_size = tempsize;
1340                                         nd->nd_repstat = VOP_SETATTR(vp,
1341                                             &nvap->na_vattr, cred);
1342                                 }
1343                         } else if (vp->v_type == VREG) {
1344                                 nd->nd_repstat = nfsrv_opencheck(clientid,
1345                                     stateidp, stp, vp, nd, p, nd->nd_repstat);
1346                         }
1347                 }
1348         } else {
1349                 if (ndp->ni_cnd.cn_flags & HASBUF)
1350                         nfsvno_relpathbuf(ndp);
1351                 if (ndp->ni_startdir && create == NFSV4OPEN_CREATE) {
1352                         vrele(ndp->ni_startdir);
1353                         if (ndp->ni_dvp == ndp->ni_vp)
1354                                 vrele(ndp->ni_dvp);
1355                         else
1356                                 vput(ndp->ni_dvp);
1357                         if (ndp->ni_vp)
1358                                 vput(ndp->ni_vp);
1359                 }
1360         }
1361         *vpp = vp;
1362 }
1363
1364 /*
1365  * Updates the file rev and sets the mtime and ctime
1366  * to the current clock time, returning the va_filerev and va_Xtime
1367  * values.
1368  */
1369 void
1370 nfsvno_updfilerev(struct vnode *vp, struct nfsvattr *nvap,
1371     struct ucred *cred, struct thread *p)
1372 {
1373         struct vattr va;
1374
1375         VATTR_NULL(&va);
1376         getnanotime(&va.va_mtime);
1377         (void) VOP_SETATTR(vp, &va, cred);
1378         (void) nfsvno_getattr(vp, nvap, cred, p);
1379 }
1380
1381 /*
1382  * Glue routine to nfsv4_fillattr().
1383  */
1384 int
1385 nfsvno_fillattr(struct nfsrv_descript *nd, struct vnode *vp,
1386     struct nfsvattr *nvap, fhandle_t *fhp, int rderror, nfsattrbit_t *attrbitp,
1387     struct ucred *cred, struct thread *p, int isdgram, int reterr)
1388 {
1389         int error;
1390
1391         error = nfsv4_fillattr(nd, vp, NULL, &nvap->na_vattr, fhp, rderror,
1392             attrbitp, cred, p, isdgram, reterr);
1393         return (error);
1394 }
1395
1396 /* Since the Readdir vnode ops vary, put the entire functions in here. */
1397 /*
1398  * nfs readdir service
1399  * - mallocs what it thinks is enough to read
1400  *      count rounded up to a multiple of DIRBLKSIZ <= NFS_MAXREADDIR
1401  * - calls VOP_READDIR()
1402  * - loops around building the reply
1403  *      if the output generated exceeds count break out of loop
1404  *      The NFSM_CLGET macro is used here so that the reply will be packed
1405  *      tightly in mbuf clusters.
1406  * - it trims out records with d_fileno == 0
1407  *      this doesn't matter for Unix clients, but they might confuse clients
1408  *      for other os'.
1409  * - it trims out records with d_type == DT_WHT
1410  *      these cannot be seen through NFS (unless we extend the protocol)
1411  *     The alternate call nfsrvd_readdirplus() does lookups as well.
1412  * PS: The NFS protocol spec. does not clarify what the "count" byte
1413  *      argument is a count of.. just name strings and file id's or the
1414  *      entire reply rpc or ...
1415  *      I tried just file name and id sizes and it confused the Sun client,
1416  *      so I am using the full rpc size now. The "paranoia.." comment refers
1417  *      to including the status longwords that are not a part of the dir.
1418  *      "entry" structures, but are in the rpc.
1419  */
1420 int
1421 nfsrvd_readdir(struct nfsrv_descript *nd, int isdgram,
1422     struct vnode *vp, struct thread *p, struct nfsexstuff *exp)
1423 {
1424         struct dirent *dp;
1425         u_int32_t *tl;
1426         int dirlen;
1427         char *cpos, *cend, *rbuf;
1428         struct nfsvattr at;
1429         int nlen, error = 0, getret = 1;
1430         int siz, cnt, fullsiz, eofflag, ncookies;
1431         u_int64_t off, toff, verf;
1432         u_long *cookies = NULL, *cookiep;
1433         struct uio io;
1434         struct iovec iv;
1435
1436         if (nd->nd_repstat) {
1437                 nfsrv_postopattr(nd, getret, &at);
1438                 return (0);
1439         }
1440         if (nd->nd_flag & ND_NFSV2) {
1441                 NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1442                 off = fxdr_unsigned(u_quad_t, *tl++);
1443         } else {
1444                 NFSM_DISSECT(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
1445                 off = fxdr_hyper(tl);
1446                 tl += 2;
1447                 verf = fxdr_hyper(tl);
1448                 tl += 2;
1449         }
1450         toff = off;
1451         cnt = fxdr_unsigned(int, *tl);
1452         if (cnt > NFS_SRVMAXDATA(nd) || cnt < 0)
1453                 cnt = NFS_SRVMAXDATA(nd);
1454         siz = ((cnt + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1));
1455         fullsiz = siz;
1456         if (nd->nd_flag & ND_NFSV3) {
1457                 nd->nd_repstat = getret = nfsvno_getattr(vp, &at, nd->nd_cred,
1458                     p);
1459 #if 0
1460                 /*
1461                  * va_filerev is not sufficient as a cookie verifier,
1462                  * since it is not supposed to change when entries are
1463                  * removed/added unless that offset cookies returned to
1464                  * the client are no longer valid.
1465                  */
1466                 if (!nd->nd_repstat && toff && verf != at.na_filerev)
1467                         nd->nd_repstat = NFSERR_BAD_COOKIE;
1468 #endif
1469         }
1470         if (nd->nd_repstat == 0 && cnt == 0) {
1471                 if (nd->nd_flag & ND_NFSV2)
1472                         /* NFSv2 does not have NFSERR_TOOSMALL */
1473                         nd->nd_repstat = EPERM;
1474                 else
1475                         nd->nd_repstat = NFSERR_TOOSMALL;
1476         }
1477         if (!nd->nd_repstat)
1478                 nd->nd_repstat = nfsvno_accchk(vp, VEXEC,
1479                     nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
1480                     NFSACCCHK_VPISLOCKED, NULL);
1481         if (nd->nd_repstat) {
1482                 vput(vp);
1483                 if (nd->nd_flag & ND_NFSV3)
1484                         nfsrv_postopattr(nd, getret, &at);
1485                 return (0);
1486         }
1487         NFSVOPUNLOCK(vp, 0, p);
1488         MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
1489 again:
1490         eofflag = 0;
1491         if (cookies) {
1492                 free((caddr_t)cookies, M_TEMP);
1493                 cookies = NULL;
1494         }
1495
1496         iv.iov_base = rbuf;
1497         iv.iov_len = siz;
1498         io.uio_iov = &iv;
1499         io.uio_iovcnt = 1;
1500         io.uio_offset = (off_t)off;
1501         io.uio_resid = siz;
1502         io.uio_segflg = UIO_SYSSPACE;
1503         io.uio_rw = UIO_READ;
1504         io.uio_td = NULL;
1505         NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY, p);
1506         nd->nd_repstat = VOP_READDIR(vp, &io, nd->nd_cred, &eofflag, &ncookies,
1507             &cookies);
1508         NFSVOPUNLOCK(vp, 0, p);
1509         off = (u_int64_t)io.uio_offset;
1510         if (io.uio_resid)
1511                 siz -= io.uio_resid;
1512
1513         if (!cookies && !nd->nd_repstat)
1514                 nd->nd_repstat = NFSERR_PERM;
1515         if (nd->nd_flag & ND_NFSV3) {
1516                 getret = nfsvno_getattr(vp, &at, nd->nd_cred, p);
1517                 if (!nd->nd_repstat)
1518                         nd->nd_repstat = getret;
1519         }
1520
1521         /*
1522          * Handles the failed cases. nd->nd_repstat == 0 past here.
1523          */
1524         if (nd->nd_repstat) {
1525                 vrele(vp);
1526                 free((caddr_t)rbuf, M_TEMP);
1527                 if (cookies)
1528                         free((caddr_t)cookies, M_TEMP);
1529                 if (nd->nd_flag & ND_NFSV3)
1530                         nfsrv_postopattr(nd, getret, &at);
1531                 return (0);
1532         }
1533         /*
1534          * If nothing read, return eof
1535          * rpc reply
1536          */
1537         if (siz == 0) {
1538                 vrele(vp);
1539                 if (nd->nd_flag & ND_NFSV2) {
1540                         NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1541                 } else {
1542                         nfsrv_postopattr(nd, getret, &at);
1543                         NFSM_BUILD(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
1544                         txdr_hyper(at.na_filerev, tl);
1545                         tl += 2;
1546                 }
1547                 *tl++ = newnfs_false;
1548                 *tl = newnfs_true;
1549                 FREE((caddr_t)rbuf, M_TEMP);
1550                 FREE((caddr_t)cookies, M_TEMP);
1551                 return (0);
1552         }
1553
1554         /*
1555          * Check for degenerate cases of nothing useful read.
1556          * If so go try again
1557          */
1558         cpos = rbuf;
1559         cend = rbuf + siz;
1560         dp = (struct dirent *)cpos;
1561         cookiep = cookies;
1562
1563         /*
1564          * For some reason FreeBSD's ufs_readdir() chooses to back the
1565          * directory offset up to a block boundary, so it is necessary to
1566          * skip over the records that precede the requested offset. This
1567          * requires the assumption that file offset cookies monotonically
1568          * increase.
1569          */
1570         while (cpos < cend && ncookies > 0 &&
1571             (dp->d_fileno == 0 || dp->d_type == DT_WHT ||
1572              ((u_quad_t)(*cookiep)) <= toff)) {
1573                 cpos += dp->d_reclen;
1574                 dp = (struct dirent *)cpos;
1575                 cookiep++;
1576                 ncookies--;
1577         }
1578         if (cpos >= cend || ncookies == 0) {
1579                 siz = fullsiz;
1580                 toff = off;
1581                 goto again;
1582         }
1583
1584         /*
1585          * dirlen is the size of the reply, including all XDR and must
1586          * not exceed cnt. For NFSv2, RFC1094 didn't clearly indicate
1587          * if the XDR should be included in "count", but to be safe, we do.
1588          * (Include the two booleans at the end of the reply in dirlen now.)
1589          */
1590         if (nd->nd_flag & ND_NFSV3) {
1591                 nfsrv_postopattr(nd, getret, &at);
1592                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1593                 txdr_hyper(at.na_filerev, tl);
1594                 dirlen = NFSX_V3POSTOPATTR + NFSX_VERF + 2 * NFSX_UNSIGNED;
1595         } else {
1596                 dirlen = 2 * NFSX_UNSIGNED;
1597         }
1598
1599         /* Loop through the records and build reply */
1600         while (cpos < cend && ncookies > 0) {
1601                 nlen = dp->d_namlen;
1602                 if (dp->d_fileno != 0 && dp->d_type != DT_WHT &&
1603                         nlen <= NFS_MAXNAMLEN) {
1604                         if (nd->nd_flag & ND_NFSV3)
1605                                 dirlen += (6*NFSX_UNSIGNED + NFSM_RNDUP(nlen));
1606                         else
1607                                 dirlen += (4*NFSX_UNSIGNED + NFSM_RNDUP(nlen));
1608                         if (dirlen > cnt) {
1609                                 eofflag = 0;
1610                                 break;
1611                         }
1612
1613                         /*
1614                          * Build the directory record xdr from
1615                          * the dirent entry.
1616                          */
1617                         if (nd->nd_flag & ND_NFSV3) {
1618                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1619                                 *tl++ = newnfs_true;
1620                                 *tl++ = 0;
1621                         } else {
1622                                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1623                                 *tl++ = newnfs_true;
1624                         }
1625                         *tl = txdr_unsigned(dp->d_fileno);
1626                         (void) nfsm_strtom(nd, dp->d_name, nlen);
1627                         if (nd->nd_flag & ND_NFSV3) {
1628                                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1629                                 *tl++ = 0;
1630                         } else
1631                                 NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
1632                         *tl = txdr_unsigned(*cookiep);
1633                 }
1634                 cpos += dp->d_reclen;
1635                 dp = (struct dirent *)cpos;
1636                 cookiep++;
1637                 ncookies--;
1638         }
1639         if (cpos < cend)
1640                 eofflag = 0;
1641         vrele(vp);
1642         NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1643         *tl++ = newnfs_false;
1644         if (eofflag)
1645                 *tl = newnfs_true;
1646         else
1647                 *tl = newnfs_false;
1648         FREE((caddr_t)rbuf, M_TEMP);
1649         FREE((caddr_t)cookies, M_TEMP);
1650         return (0);
1651 nfsmout:
1652         vput(vp);
1653         return (error);
1654 }
1655
1656 /*
1657  * Readdirplus for V3 and Readdir for V4.
1658  */
1659 int
1660 nfsrvd_readdirplus(struct nfsrv_descript *nd, int isdgram,
1661     struct vnode *vp, struct thread *p, struct nfsexstuff *exp)
1662 {
1663         struct dirent *dp;
1664         u_int32_t *tl;
1665         int dirlen;
1666         char *cpos, *cend, *rbuf;
1667         struct vnode *nvp;
1668         fhandle_t nfh;
1669         struct nfsvattr nva, at, *nvap = &nva;
1670         struct mbuf *mb0, *mb1;
1671         struct nfsreferral *refp;
1672         int nlen, r, error = 0, getret = 1, usevget = 1;
1673         int siz, cnt, fullsiz, eofflag, ncookies, entrycnt;
1674         caddr_t bpos0, bpos1;
1675         u_int64_t off, toff, verf;
1676         u_long *cookies = NULL, *cookiep;
1677         nfsattrbit_t attrbits, rderrbits, savbits;
1678         struct uio io;
1679         struct iovec iv;
1680         struct componentname cn;
1681
1682         if (nd->nd_repstat) {
1683                 nfsrv_postopattr(nd, getret, &at);
1684                 return (0);
1685         }
1686         NFSM_DISSECT(tl, u_int32_t *, 6 * NFSX_UNSIGNED);
1687         off = fxdr_hyper(tl);
1688         toff = off;
1689         tl += 2;
1690         verf = fxdr_hyper(tl);
1691         tl += 2;
1692         siz = fxdr_unsigned(int, *tl++);
1693         cnt = fxdr_unsigned(int, *tl);
1694
1695         /*
1696          * Use the server's maximum data transfer size as the upper bound
1697          * on reply datalen.
1698          */
1699         if (cnt > NFS_SRVMAXDATA(nd) || cnt < 0)
1700                 cnt = NFS_SRVMAXDATA(nd);
1701
1702         /*
1703          * siz is a "hint" of how much directory information (name, fileid,
1704          * cookie) should be in the reply. At least one client "hints" 0,
1705          * so I set it to cnt for that case. I also round it up to the
1706          * next multiple of DIRBLKSIZ.
1707          */
1708         if (siz <= 0)
1709                 siz = cnt;
1710         siz = ((siz + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1));
1711
1712         if (nd->nd_flag & ND_NFSV4) {
1713                 error = nfsrv_getattrbits(nd, &attrbits, NULL, NULL);
1714                 if (error)
1715                         goto nfsmout;
1716                 NFSSET_ATTRBIT(&savbits, &attrbits);
1717                 NFSCLRNOTFILLABLE_ATTRBIT(&attrbits);
1718                 NFSZERO_ATTRBIT(&rderrbits);
1719                 NFSSETBIT_ATTRBIT(&rderrbits, NFSATTRBIT_RDATTRERROR);
1720         } else {
1721                 NFSZERO_ATTRBIT(&attrbits);
1722         }
1723         fullsiz = siz;
1724         nd->nd_repstat = getret = nfsvno_getattr(vp, &at, nd->nd_cred, p);
1725         if (!nd->nd_repstat) {
1726             if (off && verf != at.na_filerev) {
1727                 /*
1728                  * va_filerev is not sufficient as a cookie verifier,
1729                  * since it is not supposed to change when entries are
1730                  * removed/added unless that offset cookies returned to
1731                  * the client are no longer valid.
1732                  */
1733 #if 0
1734                 if (nd->nd_flag & ND_NFSV4) {
1735                         nd->nd_repstat = NFSERR_NOTSAME;
1736                 } else {
1737                         nd->nd_repstat = NFSERR_BAD_COOKIE;
1738                 }
1739 #endif
1740             } else if ((nd->nd_flag & ND_NFSV4) && off == 0 && verf != 0) {
1741                 nd->nd_repstat = NFSERR_BAD_COOKIE;
1742             }
1743         }
1744         if (!nd->nd_repstat && vp->v_type != VDIR)
1745                 nd->nd_repstat = NFSERR_NOTDIR;
1746         if (!nd->nd_repstat && cnt == 0)
1747                 nd->nd_repstat = NFSERR_TOOSMALL;
1748         if (!nd->nd_repstat)
1749                 nd->nd_repstat = nfsvno_accchk(vp, VEXEC,
1750                     nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
1751                     NFSACCCHK_VPISLOCKED, NULL);
1752         if (nd->nd_repstat) {
1753                 vput(vp);
1754                 if (nd->nd_flag & ND_NFSV3)
1755                         nfsrv_postopattr(nd, getret, &at);
1756                 return (0);
1757         }
1758
1759         MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
1760 again:
1761         eofflag = 0;
1762         if (cookies) {
1763                 free((caddr_t)cookies, M_TEMP);
1764                 cookies = NULL;
1765         }
1766
1767         iv.iov_base = rbuf;
1768         iv.iov_len = siz;
1769         io.uio_iov = &iv;
1770         io.uio_iovcnt = 1;
1771         io.uio_offset = (off_t)off;
1772         io.uio_resid = siz;
1773         io.uio_segflg = UIO_SYSSPACE;
1774         io.uio_rw = UIO_READ;
1775         io.uio_td = NULL;
1776         nd->nd_repstat = VOP_READDIR(vp, &io, nd->nd_cred, &eofflag, &ncookies,
1777             &cookies);
1778         off = (u_int64_t)io.uio_offset;
1779         if (io.uio_resid)
1780                 siz -= io.uio_resid;
1781
1782         getret = nfsvno_getattr(vp, &at, nd->nd_cred, p);
1783
1784         if (!cookies && !nd->nd_repstat)
1785                 nd->nd_repstat = NFSERR_PERM;
1786         if (!nd->nd_repstat)
1787                 nd->nd_repstat = getret;
1788         if (nd->nd_repstat) {
1789                 vput(vp);
1790                 if (cookies)
1791                         free((caddr_t)cookies, M_TEMP);
1792                 free((caddr_t)rbuf, M_TEMP);
1793                 if (nd->nd_flag & ND_NFSV3)
1794                         nfsrv_postopattr(nd, getret, &at);
1795                 return (0);
1796         }
1797         /*
1798          * If nothing read, return eof
1799          * rpc reply
1800          */
1801         if (siz == 0) {
1802                 vput(vp);
1803                 if (nd->nd_flag & ND_NFSV3)
1804                         nfsrv_postopattr(nd, getret, &at);
1805                 NFSM_BUILD(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
1806                 txdr_hyper(at.na_filerev, tl);
1807                 tl += 2;
1808                 *tl++ = newnfs_false;
1809                 *tl = newnfs_true;
1810                 free((caddr_t)cookies, M_TEMP);
1811                 free((caddr_t)rbuf, M_TEMP);
1812                 return (0);
1813         }
1814
1815         /*
1816          * Check for degenerate cases of nothing useful read.
1817          * If so go try again
1818          */
1819         cpos = rbuf;
1820         cend = rbuf + siz;
1821         dp = (struct dirent *)cpos;
1822         cookiep = cookies;
1823
1824         /*
1825          * For some reason FreeBSD's ufs_readdir() chooses to back the
1826          * directory offset up to a block boundary, so it is necessary to
1827          * skip over the records that precede the requested offset. This
1828          * requires the assumption that file offset cookies monotonically
1829          * increase.
1830          */
1831         while (cpos < cend && ncookies > 0 &&
1832           (dp->d_fileno == 0 || dp->d_type == DT_WHT ||
1833            ((u_quad_t)(*cookiep)) <= toff ||
1834            ((nd->nd_flag & ND_NFSV4) &&
1835             ((dp->d_namlen == 1 && dp->d_name[0] == '.') ||
1836              (dp->d_namlen==2 && dp->d_name[0]=='.' && dp->d_name[1]=='.'))))) {
1837                 cpos += dp->d_reclen;
1838                 dp = (struct dirent *)cpos;
1839                 cookiep++;
1840                 ncookies--;
1841         }
1842         if (cpos >= cend || ncookies == 0) {
1843                 siz = fullsiz;
1844                 toff = off;
1845                 goto again;
1846         }
1847         NFSVOPUNLOCK(vp, 0, p);
1848
1849         /*
1850          * Save this position, in case there is an error before one entry
1851          * is created.
1852          */
1853         mb0 = nd->nd_mb;
1854         bpos0 = nd->nd_bpos;
1855
1856         /*
1857          * Fill in the first part of the reply.
1858          * dirlen is the reply length in bytes and cannot exceed cnt.
1859          * (Include the two booleans at the end of the reply in dirlen now,
1860          *  so we recognize when we have exceeded cnt.)
1861          */
1862         if (nd->nd_flag & ND_NFSV3) {
1863                 dirlen = NFSX_V3POSTOPATTR + NFSX_VERF + 2 * NFSX_UNSIGNED;
1864                 nfsrv_postopattr(nd, getret, &at);
1865         } else {
1866                 dirlen = NFSX_VERF + 2 * NFSX_UNSIGNED;
1867         }
1868         NFSM_BUILD(tl, u_int32_t *, NFSX_VERF);
1869         txdr_hyper(at.na_filerev, tl);
1870
1871         /*
1872          * Save this position, in case there is an empty reply needed.
1873          */
1874         mb1 = nd->nd_mb;
1875         bpos1 = nd->nd_bpos;
1876
1877         /* Loop through the records and build reply */
1878         entrycnt = 0;
1879         while (cpos < cend && ncookies > 0 && dirlen < cnt) {
1880                 nlen = dp->d_namlen;
1881                 if (dp->d_fileno != 0 && dp->d_type != DT_WHT &&
1882                     nlen <= NFS_MAXNAMLEN &&
1883                     ((nd->nd_flag & ND_NFSV3) || nlen > 2 ||
1884                      (nlen==2 && (dp->d_name[0]!='.' || dp->d_name[1]!='.'))
1885                       || (nlen == 1 && dp->d_name[0] != '.'))) {
1886                         /*
1887                          * Save the current position in the reply, in case
1888                          * this entry exceeds cnt.
1889                          */
1890                         mb1 = nd->nd_mb;
1891                         bpos1 = nd->nd_bpos;
1892
1893                         /*
1894                          * For readdir_and_lookup get the vnode using
1895                          * the file number.
1896                          */
1897                         nvp = NULL;
1898                         refp = NULL;
1899                         r = 0;
1900                         if ((nd->nd_flag & ND_NFSV3) ||
1901                             NFSNONZERO_ATTRBIT(&savbits)) {
1902                                 if (nd->nd_flag & ND_NFSV4)
1903                                         refp = nfsv4root_getreferral(NULL,
1904                                             vp, dp->d_fileno);
1905                                 if (refp == NULL) {
1906                                         if (usevget)
1907                                                 r = VFS_VGET(vp->v_mount,
1908                                                     dp->d_fileno, LK_EXCLUSIVE,
1909                                                     &nvp);
1910                                         else
1911                                                 r = EOPNOTSUPP;
1912                                         if (r == EOPNOTSUPP) {
1913                                                 if (usevget) {
1914                                                         usevget = 0;
1915                                                         cn.cn_nameiop = LOOKUP;
1916                                                         cn.cn_lkflags =
1917                                                             LK_EXCLUSIVE |
1918                                                             LK_RETRY;
1919                                                         cn.cn_cred =
1920                                                             nd->nd_cred;
1921                                                         cn.cn_thread = p;
1922                                                 }
1923                                                 cn.cn_nameptr = dp->d_name;
1924                                                 cn.cn_namelen = nlen;
1925                                                 cn.cn_flags = ISLASTCN |
1926                                                     NOFOLLOW | LOCKLEAF |
1927                                                     MPSAFE;
1928                                                 if (nlen == 2 &&
1929                                                     dp->d_name[0] == '.' &&
1930                                                     dp->d_name[1] == '.')
1931                                                         cn.cn_flags |=
1932                                                             ISDOTDOT;
1933                                                 if (!VOP_ISLOCKED(vp))
1934                                                         vn_lock(vp,
1935                                                             LK_EXCLUSIVE |
1936                                                             LK_RETRY);
1937                                                 if ((vp->v_vflag & VV_ROOT) != 0
1938                                                     && (cn.cn_flags & ISDOTDOT)
1939                                                     != 0) {
1940                                                         vref(vp);
1941                                                         nvp = vp;
1942                                                         r = 0;
1943                                                 } else
1944                                                         r = VOP_LOOKUP(vp, &nvp,
1945                                                             &cn);
1946                                         }
1947                                 }
1948                                 if (!r) {
1949                                     if (refp == NULL &&
1950                                         ((nd->nd_flag & ND_NFSV3) ||
1951                                          NFSNONZERO_ATTRBIT(&attrbits))) {
1952                                         r = nfsvno_getfh(nvp, &nfh, p);
1953                                         if (!r)
1954                                             r = nfsvno_getattr(nvp, nvap,
1955                                                 nd->nd_cred, p);
1956                                     }
1957                                 } else {
1958                                     nvp = NULL;
1959                                 }
1960                                 if (r) {
1961                                         if (!NFSISSET_ATTRBIT(&attrbits,
1962                                             NFSATTRBIT_RDATTRERROR)) {
1963                                                 if (nvp != NULL)
1964                                                         vput(nvp);
1965                                                 nd->nd_repstat = r;
1966                                                 break;
1967                                         }
1968                                 }
1969                         }
1970
1971                         /*
1972                          * Build the directory record xdr
1973                          */
1974                         if (nd->nd_flag & ND_NFSV3) {
1975                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1976                                 *tl++ = newnfs_true;
1977                                 *tl++ = 0;
1978                                 *tl = txdr_unsigned(dp->d_fileno);
1979                                 dirlen += nfsm_strtom(nd, dp->d_name, nlen);
1980                                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1981                                 *tl++ = 0;
1982                                 *tl = txdr_unsigned(*cookiep);
1983                                 nfsrv_postopattr(nd, 0, nvap);
1984                                 dirlen += nfsm_fhtom(nd,(u_int8_t *)&nfh,0,1);
1985                                 dirlen += (5*NFSX_UNSIGNED+NFSX_V3POSTOPATTR);
1986                                 if (nvp != NULL)
1987                                         vput(nvp);
1988                         } else {
1989                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1990                                 *tl++ = newnfs_true;
1991                                 *tl++ = 0;
1992                                 *tl = txdr_unsigned(*cookiep);
1993                                 dirlen += nfsm_strtom(nd, dp->d_name, nlen);
1994                                 if (nvp != NULL)
1995                                         NFSVOPUNLOCK(nvp, 0, p);
1996                                 if (refp != NULL) {
1997                                         dirlen += nfsrv_putreferralattr(nd,
1998                                             &savbits, refp, 0,
1999                                             &nd->nd_repstat);
2000                                         if (nd->nd_repstat) {
2001                                                 if (nvp != NULL)
2002                                                         vrele(nvp);
2003                                                 break;
2004                                         }
2005                                 } else if (r) {
2006                                         dirlen += nfsvno_fillattr(nd, nvp, nvap,
2007                                             &nfh, r, &rderrbits, nd->nd_cred,
2008                                             p, isdgram, 0);
2009                                 } else {
2010                                         dirlen += nfsvno_fillattr(nd, nvp, nvap,
2011                                             &nfh, r, &attrbits, nd->nd_cred,
2012                                             p, isdgram, 0);
2013                                 }
2014                                 if (nvp != NULL)
2015                                         vrele(nvp);
2016                                 dirlen += (3 * NFSX_UNSIGNED);
2017                         }
2018                         if (dirlen <= cnt)
2019                                 entrycnt++;
2020                 }
2021                 cpos += dp->d_reclen;
2022                 dp = (struct dirent *)cpos;
2023                 cookiep++;
2024                 ncookies--;
2025         }
2026         if (!usevget && VOP_ISLOCKED(vp))
2027                 vput(vp);
2028         else
2029                 vrele(vp);
2030
2031         /*
2032          * If dirlen > cnt, we must strip off the last entry. If that
2033          * results in an empty reply, report NFSERR_TOOSMALL.
2034          */
2035         if (dirlen > cnt || nd->nd_repstat) {
2036                 if (!nd->nd_repstat && entrycnt == 0)
2037                         nd->nd_repstat = NFSERR_TOOSMALL;
2038                 if (nd->nd_repstat)
2039                         newnfs_trimtrailing(nd, mb0, bpos0);
2040                 else
2041                         newnfs_trimtrailing(nd, mb1, bpos1);
2042                 eofflag = 0;
2043         } else if (cpos < cend)
2044                 eofflag = 0;
2045         if (!nd->nd_repstat) {
2046                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2047                 *tl++ = newnfs_false;
2048                 if (eofflag)
2049                         *tl = newnfs_true;
2050                 else
2051                         *tl = newnfs_false;
2052         }
2053         FREE((caddr_t)cookies, M_TEMP);
2054         FREE((caddr_t)rbuf, M_TEMP);
2055         return (0);
2056 nfsmout:
2057         vput(vp);
2058         return (error);
2059 }
2060
2061 /*
2062  * Get the settable attributes out of the mbuf list.
2063  * (Return 0 or EBADRPC)
2064  */
2065 int
2066 nfsrv_sattr(struct nfsrv_descript *nd, struct nfsvattr *nvap,
2067     nfsattrbit_t *attrbitp, NFSACL_T *aclp, struct thread *p)
2068 {
2069         u_int32_t *tl;
2070         struct nfsv2_sattr *sp;
2071         struct timeval curtime;
2072         int error = 0, toclient = 0;
2073
2074         switch (nd->nd_flag & (ND_NFSV2 | ND_NFSV3 | ND_NFSV4)) {
2075         case ND_NFSV2:
2076                 NFSM_DISSECT(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
2077                 /*
2078                  * Some old clients didn't fill in the high order 16bits.
2079                  * --> check the low order 2 bytes for 0xffff
2080                  */
2081                 if ((fxdr_unsigned(int, sp->sa_mode) & 0xffff) != 0xffff)
2082                         nvap->na_mode = nfstov_mode(sp->sa_mode);
2083                 if (sp->sa_uid != newnfs_xdrneg1)
2084                         nvap->na_uid = fxdr_unsigned(uid_t, sp->sa_uid);
2085                 if (sp->sa_gid != newnfs_xdrneg1)
2086                         nvap->na_gid = fxdr_unsigned(gid_t, sp->sa_gid);
2087                 if (sp->sa_size != newnfs_xdrneg1)
2088                         nvap->na_size = fxdr_unsigned(u_quad_t, sp->sa_size);
2089                 if (sp->sa_atime.nfsv2_sec != newnfs_xdrneg1) {
2090 #ifdef notyet
2091                         fxdr_nfsv2time(&sp->sa_atime, &nvap->na_atime);
2092 #else
2093                         nvap->na_atime.tv_sec =
2094                                 fxdr_unsigned(u_int32_t,sp->sa_atime.nfsv2_sec);
2095                         nvap->na_atime.tv_nsec = 0;
2096 #endif
2097                 }
2098                 if (sp->sa_mtime.nfsv2_sec != newnfs_xdrneg1)
2099                         fxdr_nfsv2time(&sp->sa_mtime, &nvap->na_mtime);
2100                 break;
2101         case ND_NFSV3:
2102                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2103                 if (*tl == newnfs_true) {
2104                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2105                         nvap->na_mode = nfstov_mode(*tl);
2106                 }
2107                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2108                 if (*tl == newnfs_true) {
2109                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2110                         nvap->na_uid = fxdr_unsigned(uid_t, *tl);
2111                 }
2112                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2113                 if (*tl == newnfs_true) {
2114                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2115                         nvap->na_gid = fxdr_unsigned(gid_t, *tl);
2116                 }
2117                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2118                 if (*tl == newnfs_true) {
2119                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2120                         nvap->na_size = fxdr_hyper(tl);
2121                 }
2122                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2123                 switch (fxdr_unsigned(int, *tl)) {
2124                 case NFSV3SATTRTIME_TOCLIENT:
2125                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2126                         fxdr_nfsv3time(tl, &nvap->na_atime);
2127                         toclient = 1;
2128                         break;
2129                 case NFSV3SATTRTIME_TOSERVER:
2130                         NFSGETTIME(&curtime);
2131                         nvap->na_atime.tv_sec = curtime.tv_sec;
2132                         nvap->na_atime.tv_nsec = curtime.tv_usec * 1000;
2133                         nvap->na_vaflags |= VA_UTIMES_NULL;
2134                         break;
2135                 };
2136                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2137                 switch (fxdr_unsigned(int, *tl)) {
2138                 case NFSV3SATTRTIME_TOCLIENT:
2139                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2140                         fxdr_nfsv3time(tl, &nvap->na_mtime);
2141                         nvap->na_vaflags &= ~VA_UTIMES_NULL;
2142                         break;
2143                 case NFSV3SATTRTIME_TOSERVER:
2144                         NFSGETTIME(&curtime);
2145                         nvap->na_mtime.tv_sec = curtime.tv_sec;
2146                         nvap->na_mtime.tv_nsec = curtime.tv_usec * 1000;
2147                         if (!toclient)
2148                                 nvap->na_vaflags |= VA_UTIMES_NULL;
2149                         break;
2150                 };
2151                 break;
2152         case ND_NFSV4:
2153                 error = nfsv4_sattr(nd, nvap, attrbitp, aclp, p);
2154         };
2155 nfsmout:
2156         return (error);
2157 }
2158
2159 /*
2160  * Handle the setable attributes for V4.
2161  * Returns NFSERR_BADXDR if it can't be parsed, 0 otherwise.
2162  */
2163 int
2164 nfsv4_sattr(struct nfsrv_descript *nd, struct nfsvattr *nvap,
2165     nfsattrbit_t *attrbitp, NFSACL_T *aclp, struct thread *p)
2166 {
2167         u_int32_t *tl;
2168         int attrsum = 0;
2169         int i, j;
2170         int error, attrsize, bitpos, aclsize, aceerr, retnotsup = 0;
2171         int toclient = 0;
2172         u_char *cp, namestr[NFSV4_SMALLSTR + 1];
2173         uid_t uid;
2174         gid_t gid;
2175         struct timeval curtime;
2176
2177         error = nfsrv_getattrbits(nd, attrbitp, NULL, &retnotsup);
2178         if (error)
2179                 return (error);
2180         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2181         attrsize = fxdr_unsigned(int, *tl);
2182
2183         /*
2184          * Loop around getting the setable attributes. If an unsupported
2185          * one is found, set nd_repstat == NFSERR_ATTRNOTSUPP and return.
2186          */
2187         if (retnotsup) {
2188                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2189                 bitpos = NFSATTRBIT_MAX;
2190         } else {
2191                 bitpos = 0;
2192         }
2193         for (; bitpos < NFSATTRBIT_MAX; bitpos++) {
2194             if (attrsum > attrsize) {
2195                 error = NFSERR_BADXDR;
2196                 goto nfsmout;
2197             }
2198             if (NFSISSET_ATTRBIT(attrbitp, bitpos))
2199                 switch (bitpos) {
2200                 case NFSATTRBIT_SIZE:
2201                         NFSM_DISSECT(tl, u_int32_t *, NFSX_HYPER);
2202                         nvap->na_size = fxdr_hyper(tl);
2203                         attrsum += NFSX_HYPER;
2204                         break;
2205                 case NFSATTRBIT_ACL:
2206                         error = nfsrv_dissectacl(nd, aclp, &aceerr, &aclsize,
2207                             p);
2208                         if (error)
2209                                 goto nfsmout;
2210                         if (aceerr && !nd->nd_repstat)
2211                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2212                         attrsum += aclsize;
2213                         break;
2214                 case NFSATTRBIT_ARCHIVE:
2215                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2216                         if (!nd->nd_repstat)
2217                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2218                         attrsum += NFSX_UNSIGNED;
2219                         break;
2220                 case NFSATTRBIT_HIDDEN:
2221                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2222                         if (!nd->nd_repstat)
2223                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2224                         attrsum += NFSX_UNSIGNED;
2225                         break;
2226                 case NFSATTRBIT_MIMETYPE:
2227                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2228                         i = fxdr_unsigned(int, *tl);
2229                         error = nfsm_advance(nd, NFSM_RNDUP(i), -1);
2230                         if (error)
2231                                 goto nfsmout;
2232                         if (!nd->nd_repstat)
2233                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2234                         attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(i));
2235                         break;
2236                 case NFSATTRBIT_MODE:
2237                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2238                         nvap->na_mode = nfstov_mode(*tl);
2239                         attrsum += NFSX_UNSIGNED;
2240                         break;
2241                 case NFSATTRBIT_OWNER:
2242                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2243                         j = fxdr_unsigned(int, *tl);
2244                         if (j < 0)
2245                                 return (NFSERR_BADXDR);
2246                         if (j > NFSV4_SMALLSTR)
2247                                 cp = malloc(j + 1, M_NFSSTRING, M_WAITOK);
2248                         else
2249                                 cp = namestr;
2250                         error = nfsrv_mtostr(nd, cp, j);
2251                         if (error) {
2252                                 if (j > NFSV4_SMALLSTR)
2253                                         free(cp, M_NFSSTRING);
2254                                 return (error);
2255                         }
2256                         if (!nd->nd_repstat) {
2257                                 nd->nd_repstat = nfsv4_strtouid(cp,j,&uid,p);
2258                                 if (!nd->nd_repstat)
2259                                         nvap->na_uid = uid;
2260                         }
2261                         if (j > NFSV4_SMALLSTR)
2262                                 free(cp, M_NFSSTRING);
2263                         attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(j));
2264                         break;
2265                 case NFSATTRBIT_OWNERGROUP:
2266                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2267                         j = fxdr_unsigned(int, *tl);
2268                         if (j < 0)
2269                                 return (NFSERR_BADXDR);
2270                         if (j > NFSV4_SMALLSTR)
2271                                 cp = malloc(j + 1, M_NFSSTRING, M_WAITOK);
2272                         else
2273                                 cp = namestr;
2274                         error = nfsrv_mtostr(nd, cp, j);
2275                         if (error) {
2276                                 if (j > NFSV4_SMALLSTR)
2277                                         free(cp, M_NFSSTRING);
2278                                 return (error);
2279                         }
2280                         if (!nd->nd_repstat) {
2281                                 nd->nd_repstat = nfsv4_strtogid(cp,j,&gid,p);
2282                                 if (!nd->nd_repstat)
2283                                         nvap->na_gid = gid;
2284                         }
2285                         if (j > NFSV4_SMALLSTR)
2286                                 free(cp, M_NFSSTRING);
2287                         attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(j));
2288                         break;
2289                 case NFSATTRBIT_SYSTEM:
2290                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2291                         if (!nd->nd_repstat)
2292                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2293                         attrsum += NFSX_UNSIGNED;
2294                         break;
2295                 case NFSATTRBIT_TIMEACCESSSET:
2296                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2297                         attrsum += NFSX_UNSIGNED;
2298                         if (fxdr_unsigned(int, *tl)==NFSV4SATTRTIME_TOCLIENT) {
2299                             NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2300                             fxdr_nfsv4time(tl, &nvap->na_atime);
2301                             toclient = 1;
2302                             attrsum += NFSX_V4TIME;
2303                         } else {
2304                             NFSGETTIME(&curtime);
2305                             nvap->na_atime.tv_sec = curtime.tv_sec;
2306                             nvap->na_atime.tv_nsec = curtime.tv_usec * 1000;
2307                             nvap->na_vaflags |= VA_UTIMES_NULL;
2308                         }
2309                         break;
2310                 case NFSATTRBIT_TIMEBACKUP:
2311                         NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2312                         if (!nd->nd_repstat)
2313                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2314                         attrsum += NFSX_V4TIME;
2315                         break;
2316                 case NFSATTRBIT_TIMECREATE:
2317                         NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2318                         if (!nd->nd_repstat)
2319                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2320                         attrsum += NFSX_V4TIME;
2321                         break;
2322                 case NFSATTRBIT_TIMEMODIFYSET:
2323                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2324                         attrsum += NFSX_UNSIGNED;
2325                         if (fxdr_unsigned(int, *tl)==NFSV4SATTRTIME_TOCLIENT) {
2326                             NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2327                             fxdr_nfsv4time(tl, &nvap->na_mtime);
2328                             nvap->na_vaflags &= ~VA_UTIMES_NULL;
2329                             attrsum += NFSX_V4TIME;
2330                         } else {
2331                             NFSGETTIME(&curtime);
2332                             nvap->na_mtime.tv_sec = curtime.tv_sec;
2333                             nvap->na_mtime.tv_nsec = curtime.tv_usec * 1000;
2334                             if (!toclient)
2335                                 nvap->na_vaflags |= VA_UTIMES_NULL;
2336                         }
2337                         break;
2338                 default:
2339                         nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2340                         /*
2341                          * set bitpos so we drop out of the loop.
2342                          */
2343                         bitpos = NFSATTRBIT_MAX;
2344                         break;
2345                 };
2346         }
2347
2348         /*
2349          * some clients pad the attrlist, so we need to skip over the
2350          * padding.
2351          */
2352         if (attrsum > attrsize) {
2353                 error = NFSERR_BADXDR;
2354         } else {
2355                 attrsize = NFSM_RNDUP(attrsize);
2356                 if (attrsum < attrsize)
2357                         error = nfsm_advance(nd, attrsize - attrsum, -1);
2358         }
2359 nfsmout:
2360         return (error);
2361 }
2362
2363 /*
2364  * Check/setup export credentials.
2365  */
2366 int
2367 nfsd_excred(struct nfsrv_descript *nd, struct nfsexstuff *exp,
2368     struct ucred *credanon)
2369 {
2370         int error = 0;
2371
2372         /*
2373          * Check/setup credentials.
2374          */
2375         if (nd->nd_flag & ND_GSS)
2376                 exp->nes_exflag &= ~MNT_EXPORTANON;
2377
2378         /*
2379          * Check to see if the operation is allowed for this security flavor.
2380          * RFC2623 suggests that the NFSv3 Fsinfo RPC be allowed to
2381          * AUTH_NONE or AUTH_SYS for file systems requiring RPCSEC_GSS.
2382          * Also, allow Secinfo, so that it can acquire the correct flavor(s).
2383          */
2384         if (nfsvno_testexp(nd, exp) &&
2385             nd->nd_procnum != NFSV4OP_SECINFO &&
2386             nd->nd_procnum != NFSPROC_FSINFO) {
2387                 if (nd->nd_flag & ND_NFSV4)
2388                         error = NFSERR_WRONGSEC;
2389                 else
2390                         error = (NFSERR_AUTHERR | AUTH_TOOWEAK);
2391                 return (error);
2392         }
2393
2394         /*
2395          * Check to see if the file system is exported V4 only.
2396          */
2397         if (NFSVNO_EXV4ONLY(exp) && !(nd->nd_flag & ND_NFSV4))
2398                 return (NFSERR_PROGNOTV4);
2399
2400         /*
2401          * Now, map the user credentials.
2402          * (Note that ND_AUTHNONE will only be set for an NFSv3
2403          *  Fsinfo RPC. If set for anything else, this code might need
2404          *  to change.)
2405          */
2406         if (NFSVNO_EXPORTED(exp) &&
2407             ((!(nd->nd_flag & ND_GSS) && nd->nd_cred->cr_uid == 0) ||
2408              NFSVNO_EXPORTANON(exp) ||
2409              (nd->nd_flag & ND_AUTHNONE))) {
2410                 nd->nd_cred->cr_uid = credanon->cr_uid;
2411                 nd->nd_cred->cr_gid = credanon->cr_gid;
2412                 crsetgroups(nd->nd_cred, credanon->cr_ngroups,
2413                     credanon->cr_groups);
2414         }
2415         return (0);
2416 }
2417
2418 /*
2419  * Check exports.
2420  */
2421 int
2422 nfsvno_checkexp(struct mount *mp, struct sockaddr *nam, struct nfsexstuff *exp,
2423     struct ucred **credp)
2424 {
2425         int i, error, *secflavors;
2426
2427         error = VFS_CHECKEXP(mp, nam, &exp->nes_exflag, credp,
2428             &exp->nes_numsecflavor, &secflavors);
2429         if (error) {
2430                 if (nfs_rootfhset) {
2431                         exp->nes_exflag = 0;
2432                         exp->nes_numsecflavor = 0;
2433                         error = 0;
2434                 }
2435         } else {
2436                 /* Copy the security flavors. */
2437                 for (i = 0; i < exp->nes_numsecflavor; i++)
2438                         exp->nes_secflavors[i] = secflavors[i];
2439         }
2440         return (error);
2441 }
2442
2443 /*
2444  * Get a vnode for a file handle and export stuff.
2445  */
2446 int
2447 nfsvno_fhtovp(struct mount *mp, fhandle_t *fhp, struct sockaddr *nam,
2448     struct vnode **vpp, struct nfsexstuff *exp, struct ucred **credp)
2449 {
2450         int i, error, *secflavors;
2451
2452         *credp = NULL;
2453         exp->nes_numsecflavor = 0;
2454         error = VFS_FHTOVP(mp, &fhp->fh_fid, vpp);
2455         if (error != 0)
2456                 /* Make sure the server replies ESTALE to the client. */
2457                 error = ESTALE;
2458         if (nam && !error) {
2459                 error = VFS_CHECKEXP(mp, nam, &exp->nes_exflag, credp,
2460                     &exp->nes_numsecflavor, &secflavors);
2461                 if (error) {
2462                         if (nfs_rootfhset) {
2463                                 exp->nes_exflag = 0;
2464                                 exp->nes_numsecflavor = 0;
2465                                 error = 0;
2466                         } else {
2467                                 vput(*vpp);
2468                         }
2469                 } else {
2470                         /* Copy the security flavors. */
2471                         for (i = 0; i < exp->nes_numsecflavor; i++)
2472                                 exp->nes_secflavors[i] = secflavors[i];
2473                 }
2474         }
2475         return (error);
2476 }
2477
2478 /*
2479  * Do the pathconf vnode op.
2480  */
2481 int
2482 nfsvno_pathconf(struct vnode *vp, int flag, register_t *retf,
2483     struct ucred *cred, struct thread *p)
2484 {
2485         int error;
2486
2487         error = VOP_PATHCONF(vp, flag, retf);
2488         return (error);
2489 }
2490
2491 /*
2492  * nfsd_fhtovp() - convert a fh to a vnode ptr
2493  *      - look up fsid in mount list (if not found ret error)
2494  *      - get vp and export rights by calling nfsvno_fhtovp()
2495  *      - if cred->cr_uid == 0 or MNT_EXPORTANON set it to credanon
2496  *        for AUTH_SYS
2497  * Also handle getting the Giant lock for the file system,
2498  * as required:
2499  * - if same mount point as *mpp
2500  *       do nothing
2501  *   else if *mpp == NULL
2502  *       if already locked
2503  *           leave it locked
2504  *       else
2505  *           call VFS_LOCK_GIANT()
2506  *   else
2507  *       if already locked
2508  *            unlock Giant
2509  *       call VFS_LOCK_GIANT()
2510  */
2511 void
2512 nfsd_fhtovp(struct nfsrv_descript *nd, struct nfsrvfh *nfp,
2513     struct vnode **vpp, struct nfsexstuff *exp,
2514     struct mount **mpp, int startwrite, struct thread *p)
2515 {
2516         struct mount *mp;
2517         struct ucred *credanon;
2518         fhandle_t *fhp;
2519
2520         fhp = (fhandle_t *)nfp->nfsrvfh_data;
2521         /*
2522          * Check for the special case of the nfsv4root_fh.
2523          */
2524         mp = vfs_getvfs(&fhp->fh_fsid);
2525         if (!mp) {
2526                 *vpp = NULL;
2527                 nd->nd_repstat = ESTALE;
2528                 if (*mpp && exp->nes_vfslocked)
2529                         VFS_UNLOCK_GIANT(*mpp);
2530                 *mpp = NULL;
2531                 exp->nes_vfslocked = 0;
2532                 return;
2533         }
2534
2535         /*
2536          * Now, handle Giant for the file system.
2537          */
2538         if (*mpp != NULL && *mpp != mp && exp->nes_vfslocked) {
2539                 VFS_UNLOCK_GIANT(*mpp);
2540                 exp->nes_vfslocked = 0;
2541         }
2542         if (!exp->nes_vfslocked && *mpp != mp)
2543                 exp->nes_vfslocked = VFS_LOCK_GIANT(mp);
2544
2545         *mpp = mp;
2546         if (startwrite)
2547                 vn_start_write(NULL, mpp, V_WAIT);
2548
2549         nd->nd_repstat = nfsvno_fhtovp(mp, fhp, nd->nd_nam, vpp, exp,
2550             &credanon);
2551
2552         /*
2553          * For NFSv4 without a pseudo root fs, unexported file handles
2554          * can be returned, so that Lookup works everywhere.
2555          */
2556         if (!nd->nd_repstat && exp->nes_exflag == 0 &&
2557             !(nd->nd_flag & ND_NFSV4)) {
2558                 vput(*vpp);
2559                 nd->nd_repstat = EACCES;
2560         }
2561
2562         /*
2563          * Personally, I've never seen any point in requiring a
2564          * reserved port#, since only in the rare case where the
2565          * clients are all boxes with secure system priviledges,
2566          * does it provide any enhanced security, but... some people
2567          * believe it to be useful and keep putting this code back in.
2568          * (There is also some "security checker" out there that
2569          *  complains if the nfs server doesn't enforce this.)
2570          * However, note the following:
2571          * RFC3530 (NFSv4) specifies that a reserved port# not be
2572          *      required.
2573          * RFC2623 recommends that, if a reserved port# is checked for,
2574          *      that there be a way to turn that off--> ifdef'd.
2575          */
2576 #ifdef NFS_REQRSVPORT
2577         if (!nd->nd_repstat) {
2578                 struct sockaddr_in *saddr;
2579                 struct sockaddr_in6 *saddr6;
2580
2581                 saddr = NFSSOCKADDR(nd->nd_nam, struct sockaddr_in *);
2582                 saddr6 = NFSSOCKADDR(nd->nd_nam, struct sockaddr_in6 *);
2583                 if (!(nd->nd_flag & ND_NFSV4) &&
2584                     ((saddr->sin_family == AF_INET &&
2585                       ntohs(saddr->sin_port) >= IPPORT_RESERVED) ||
2586                      (saddr6->sin6_family == AF_INET6 &&
2587                       ntohs(saddr6->sin6_port) >= IPPORT_RESERVED))) {
2588                         vput(*vpp);
2589                         nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
2590                 }
2591         }
2592 #endif  /* NFS_REQRSVPORT */
2593
2594         /*
2595          * Check/setup credentials.
2596          */
2597         if (!nd->nd_repstat) {
2598                 nd->nd_saveduid = nd->nd_cred->cr_uid;
2599                 nd->nd_repstat = nfsd_excred(nd, exp, credanon);
2600                 if (nd->nd_repstat)
2601                         vput(*vpp);
2602         }
2603         if (credanon != NULL)
2604                 crfree(credanon);
2605         if (nd->nd_repstat) {
2606                 if (startwrite)
2607                         vn_finished_write(mp);
2608                 if (exp->nes_vfslocked) {
2609                         VFS_UNLOCK_GIANT(mp);
2610                         exp->nes_vfslocked = 0;
2611                 }
2612                 vfs_rel(mp);
2613                 *vpp = NULL;
2614                 *mpp = NULL;
2615         } else {
2616                 vfs_rel(mp);
2617         }
2618 }
2619
2620 /*
2621  * glue for fp.
2622  */
2623 int
2624 fp_getfvp(struct thread *p, int fd, struct file **fpp, struct vnode **vpp)
2625 {
2626         struct filedesc *fdp;
2627         struct file *fp;
2628
2629         fdp = p->td_proc->p_fd;
2630         if (fd >= fdp->fd_nfiles ||
2631             (fp = fdp->fd_ofiles[fd]) == NULL)
2632                 return (EBADF);
2633         *fpp = fp;
2634         return (0);
2635 }
2636
2637 /*
2638  * Called from nfssvc() to update the exports list. Just call
2639  * vfs_export(). This has to be done, since the v4 root fake fs isn't
2640  * in the mount list.
2641  */
2642 int
2643 nfsrv_v4rootexport(void *argp, struct ucred *cred, struct thread *p)
2644 {
2645         struct nfsex_args *nfsexargp = (struct nfsex_args *)argp;
2646         int error;
2647         struct nameidata nd;
2648         fhandle_t fh;
2649
2650         error = vfs_export(&nfsv4root_mnt, &nfsexargp->export);
2651         if ((nfsexargp->export.ex_flags & MNT_DELEXPORT)) {
2652                 nfs_rootfhset = 0;
2653                 nfsv4root_set = 0;
2654         } else if (error == 0) {
2655                 if (nfsexargp->fspec == NULL)
2656                         return (EPERM);
2657                 /*
2658                  * If fspec != NULL, this is the v4root path.
2659                  */
2660                 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE, UIO_USERSPACE,
2661                     nfsexargp->fspec, p);
2662                 if ((error = namei(&nd)) != 0)
2663                         return (error);
2664                 error = nfsvno_getfh(nd.ni_vp, &fh, p);
2665                 vrele(nd.ni_vp);
2666                 if (!error) {
2667                         nfs_rootfh.nfsrvfh_len = NFSX_MYFH;
2668                         NFSBCOPY((caddr_t)&fh,
2669                             nfs_rootfh.nfsrvfh_data,
2670                             sizeof (fhandle_t));
2671                         nfs_rootfhset = 1;
2672                 }
2673         }
2674         return (error);
2675 }
2676
2677 /*
2678  * Get the tcp socket sequence numbers we need.
2679  * (Maybe this should be moved to the tcp sources?)
2680  */
2681 int
2682 nfsrv_getsocksndseq(struct socket *so, tcp_seq *maxp, tcp_seq *unap)
2683 {
2684         struct inpcb *inp;
2685         struct tcpcb *tp;
2686
2687         inp = sotoinpcb(so);
2688         KASSERT(inp != NULL, ("nfsrv_getsocksndseq: inp == NULL"));
2689         INP_RLOCK(inp);
2690         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
2691                 INP_RUNLOCK(inp);
2692                 return (EPIPE);
2693         }
2694         tp = intotcpcb(inp);
2695         if (tp->t_state != TCPS_ESTABLISHED) {
2696                 INP_RUNLOCK(inp);
2697                 return (EPIPE);
2698         }
2699         *maxp = tp->snd_max;
2700         *unap = tp->snd_una;
2701         INP_RUNLOCK(inp);
2702         return (0);
2703 }
2704
2705 /*
2706  * This function needs to test to see if the system is near its limit
2707  * for memory allocation via malloc() or mget() and return True iff
2708  * either of these resources are near their limit.
2709  * XXX (For now, this is just a stub.)
2710  */
2711 int nfsrv_testmalloclimit = 0;
2712 int
2713 nfsrv_mallocmget_limit(void)
2714 {
2715         static int printmesg = 0;
2716         static int testval = 1;
2717
2718         if (nfsrv_testmalloclimit && (testval++ % 1000) == 0) {
2719                 if ((printmesg++ % 100) == 0)
2720                         printf("nfsd: malloc/mget near limit\n");
2721                 return (1);
2722         }
2723         return (0);
2724 }
2725
2726 /*
2727  * BSD specific initialization of a mount point.
2728  */
2729 void
2730 nfsd_mntinit(void)
2731 {
2732         static int inited = 0;
2733
2734         if (inited)
2735                 return;
2736         inited = 1;
2737         nfsv4root_mnt.mnt_flag = (MNT_RDONLY | MNT_EXPORTED);
2738         TAILQ_INIT(&nfsv4root_mnt.mnt_nvnodelist);
2739         nfsv4root_mnt.mnt_export = NULL;
2740         TAILQ_INIT(&nfsv4root_opt);
2741         TAILQ_INIT(&nfsv4root_newopt);
2742         nfsv4root_mnt.mnt_opt = &nfsv4root_opt;
2743         nfsv4root_mnt.mnt_optnew = &nfsv4root_newopt;
2744         nfsv4root_mnt.mnt_nvnodelistsize = 0;
2745 }
2746
2747 /*
2748  * Get a vnode for a file handle, without checking exports, etc.
2749  */
2750 struct vnode *
2751 nfsvno_getvp(fhandle_t *fhp)
2752 {
2753         struct mount *mp;
2754         struct vnode *vp;
2755         int error;
2756
2757         mp = vfs_getvfs(&fhp->fh_fsid);
2758         if (mp == NULL)
2759                 return (NULL);
2760         error = VFS_FHTOVP(mp, &fhp->fh_fid, &vp);
2761         if (error)
2762                 return (NULL);
2763         return (vp);
2764 }
2765
2766 /*
2767  * Check to see it a byte range lock held by a process running
2768  * locally on the server conflicts with the new lock.
2769  */
2770 int
2771 nfsvno_localconflict(struct vnode *vp, int ftype, u_int64_t first,
2772     u_int64_t end, struct nfslockconflict *cfp, struct thread *td)
2773 {
2774         int error;
2775         struct flock fl;
2776
2777         if (!nfsrv_dolocallocks)
2778                 return (0);
2779         fl.l_whence = SEEK_SET;
2780         fl.l_type = ftype;
2781         fl.l_start = (off_t)first;
2782         if (end == NFS64BITSSET)
2783                 fl.l_len = 0;
2784         else
2785                 fl.l_len = (off_t)(end - first);
2786         /*
2787          * For FreeBSD8, the l_pid and l_sysid must be set to the same
2788          * values for all calls, so that all locks will be held by the
2789          * nfsd server. (The nfsd server handles conflicts between the
2790          * various clients.)
2791          * Since an NFSv4 lockowner is a ClientID plus an array of up to 1024
2792          * bytes, so it can't be put in l_sysid.
2793          */
2794         if (nfsv4_sysid == 0)
2795                 nfsv4_sysid = nlm_acquire_next_sysid();
2796         fl.l_pid = (pid_t)0;
2797         fl.l_sysid = (int)nfsv4_sysid;
2798
2799         NFSVOPUNLOCK(vp, 0, td);
2800         error = VOP_ADVLOCK(vp, (caddr_t)td->td_proc, F_GETLK, &fl,
2801             (F_POSIX | F_REMOTE));
2802         NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY, td);
2803         if (error)
2804                 return (error);
2805         if (fl.l_type == F_UNLCK)
2806                 return (0);
2807         if (cfp != NULL) {
2808                 cfp->cl_clientid.lval[0] = cfp->cl_clientid.lval[1] = 0;
2809                 cfp->cl_first = (u_int64_t)fl.l_start;
2810                 if (fl.l_len == 0)
2811                         cfp->cl_end = NFS64BITSSET;
2812                 else
2813                         cfp->cl_end = (u_int64_t)
2814                             (fl.l_start + fl.l_len);
2815                 if (fl.l_type == F_WRLCK)
2816                         cfp->cl_flags = NFSLCK_WRITE;
2817                 else
2818                         cfp->cl_flags = NFSLCK_READ;
2819                 sprintf(cfp->cl_owner, "LOCALID%d", fl.l_pid);
2820                 cfp->cl_ownerlen = strlen(cfp->cl_owner);
2821                 return (NFSERR_DENIED);
2822         }
2823         return (NFSERR_INVAL);
2824 }
2825
2826 /*
2827  * Do a local VOP_ADVLOCK().
2828  */
2829 int
2830 nfsvno_advlock(struct vnode *vp, int ftype, u_int64_t first,
2831     u_int64_t end, struct thread *td)
2832 {
2833         int error;
2834         struct flock fl;
2835         u_int64_t tlen;
2836
2837         if (nfsrv_dolocallocks == 0)
2838                 return (0);
2839         fl.l_whence = SEEK_SET;
2840         fl.l_type = ftype;
2841         fl.l_start = (off_t)first;
2842         if (end == NFS64BITSSET) {
2843                 fl.l_len = 0;
2844         } else {
2845                 tlen = end - first;
2846                 fl.l_len = (off_t)tlen;
2847         }
2848         /*
2849          * For FreeBSD8, the l_pid and l_sysid must be set to the same
2850          * values for all calls, so that all locks will be held by the
2851          * nfsd server. (The nfsd server handles conflicts between the
2852          * various clients.)
2853          * Since an NFSv4 lockowner is a ClientID plus an array of up to 1024
2854          * bytes, so it can't be put in l_sysid.
2855          */
2856         if (nfsv4_sysid == 0)
2857                 nfsv4_sysid = nlm_acquire_next_sysid();
2858         fl.l_pid = (pid_t)0;
2859         fl.l_sysid = (int)nfsv4_sysid;
2860
2861         NFSVOPUNLOCK(vp, 0, td);
2862         if (ftype == F_UNLCK)
2863                 error = VOP_ADVLOCK(vp, (caddr_t)td->td_proc, F_UNLCK, &fl,
2864                     (F_POSIX | F_REMOTE));
2865         else
2866                 error = VOP_ADVLOCK(vp, (caddr_t)td->td_proc, F_SETLK, &fl,
2867                     (F_POSIX | F_REMOTE));
2868         NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY, td);
2869         return (error);
2870 }
2871
2872 /*
2873  * Unlock an underlying local file system.
2874  */
2875 void
2876 nfsvno_unlockvfs(struct mount *mp)
2877 {
2878
2879         VFS_UNLOCK_GIANT(mp);
2880 }
2881
2882 /*
2883  * Lock an underlying file system, as required, and return
2884  * whether or not it is locked.
2885  */
2886 int
2887 nfsvno_lockvfs(struct mount *mp)
2888 {
2889         int ret;
2890
2891         ret = VFS_LOCK_GIANT(mp);
2892         return (ret);
2893 }
2894
2895 /*
2896  * Check the nfsv4 root exports.
2897  */
2898 int
2899 nfsvno_v4rootexport(struct nfsrv_descript *nd)
2900 {
2901         struct ucred *credanon;
2902         int exflags, error, numsecflavor, *secflavors, i;
2903
2904         error = vfs_stdcheckexp(&nfsv4root_mnt, nd->nd_nam, &exflags,
2905             &credanon, &numsecflavor, &secflavors);
2906         if (error)
2907                 return (NFSERR_PROGUNAVAIL);
2908         if (credanon != NULL)
2909                 crfree(credanon);
2910         for (i = 0; i < numsecflavor; i++) {
2911                 if (secflavors[i] == AUTH_SYS)
2912                         nd->nd_flag |= ND_EXAUTHSYS;
2913                 else if (secflavors[i] == RPCSEC_GSS_KRB5)
2914                         nd->nd_flag |= ND_EXGSS;
2915                 else if (secflavors[i] == RPCSEC_GSS_KRB5I)
2916                         nd->nd_flag |= ND_EXGSSINTEGRITY;
2917                 else if (secflavors[i] == RPCSEC_GSS_KRB5P)
2918                         nd->nd_flag |= ND_EXGSSPRIVACY;
2919         }
2920         return (0);
2921 }
2922
2923 /*
2924  * Nfs server psuedo system call for the nfsd's
2925  */
2926 /*
2927  * MPSAFE
2928  */
2929 static int
2930 nfssvc_nfsd(struct thread *td, struct nfssvc_args *uap)
2931 {
2932         struct file *fp;
2933         struct nfsd_addsock_args sockarg;
2934         struct nfsd_nfsd_args nfsdarg;
2935         int error;
2936
2937         if (uap->flag & NFSSVC_NFSDADDSOCK) {
2938                 error = copyin(uap->argp, (caddr_t)&sockarg, sizeof (sockarg));
2939                 if (error)
2940                         return (error);
2941                 if ((error = fget(td, sockarg.sock, &fp)) != 0) {
2942                         return (error);
2943                 }
2944                 if (fp->f_type != DTYPE_SOCKET) {
2945                         fdrop(fp, td);
2946                         return (EPERM);
2947                 }
2948                 error = nfsrvd_addsock(fp);
2949                 fdrop(fp, td);
2950         } else if (uap->flag & NFSSVC_NFSDNFSD) {
2951                 if (uap->argp == NULL)
2952                         return (EINVAL);
2953                 error = copyin(uap->argp, (caddr_t)&nfsdarg,
2954                     sizeof (nfsdarg));
2955                 if (error)
2956                         return (error);
2957                 error = nfsrvd_nfsd(td, &nfsdarg);
2958         } else {
2959                 error = nfssvc_srvcall(td, uap, td->td_ucred);
2960         }
2961         return (error);
2962 }
2963
2964 static int
2965 nfssvc_srvcall(struct thread *p, struct nfssvc_args *uap, struct ucred *cred)
2966 {
2967         struct nfsex_args export;
2968         struct file *fp = NULL;
2969         int stablefd, len;
2970         struct nfsd_clid adminrevoke;
2971         struct nfsd_dumplist dumplist;
2972         struct nfsd_dumpclients *dumpclients;
2973         struct nfsd_dumplocklist dumplocklist;
2974         struct nfsd_dumplocks *dumplocks;
2975         struct nameidata nd;
2976         vnode_t vp;
2977         int error = EINVAL;
2978
2979         if (uap->flag & NFSSVC_PUBLICFH) {
2980                 NFSBZERO((caddr_t)&nfs_pubfh.nfsrvfh_data,
2981                     sizeof (fhandle_t));
2982                 error = copyin(uap->argp,
2983                     &nfs_pubfh.nfsrvfh_data, sizeof (fhandle_t));
2984                 if (!error)
2985                         nfs_pubfhset = 1;
2986         } else if (uap->flag & NFSSVC_V4ROOTEXPORT) {
2987                 error = copyin(uap->argp,(caddr_t)&export,
2988                     sizeof (struct nfsex_args));
2989                 if (!error)
2990                         error = nfsrv_v4rootexport(&export, cred, p);
2991         } else if (uap->flag & NFSSVC_NOPUBLICFH) {
2992                 nfs_pubfhset = 0;
2993                 error = 0;
2994         } else if (uap->flag & NFSSVC_STABLERESTART) {
2995                 error = copyin(uap->argp, (caddr_t)&stablefd,
2996                     sizeof (int));
2997                 if (!error)
2998                         error = fp_getfvp(p, stablefd, &fp, &vp);
2999                 if (!error && (NFSFPFLAG(fp) & (FREAD | FWRITE)) != (FREAD | FWRITE))
3000                         error = EBADF;
3001                 if (!error && newnfs_numnfsd != 0)
3002                         error = EPERM;
3003                 if (!error) {
3004                         nfsrv_stablefirst.nsf_fp = fp;
3005                         nfsrv_setupstable(p);
3006                 }
3007         } else if (uap->flag & NFSSVC_ADMINREVOKE) {
3008                 error = copyin(uap->argp, (caddr_t)&adminrevoke,
3009                     sizeof (struct nfsd_clid));
3010                 if (!error)
3011                         error = nfsrv_adminrevoke(&adminrevoke, p);
3012         } else if (uap->flag & NFSSVC_DUMPCLIENTS) {
3013                 error = copyin(uap->argp, (caddr_t)&dumplist,
3014                     sizeof (struct nfsd_dumplist));
3015                 if (!error && (dumplist.ndl_size < 1 ||
3016                         dumplist.ndl_size > NFSRV_MAXDUMPLIST))
3017                         error = EPERM;
3018                 if (!error) {
3019                     len = sizeof (struct nfsd_dumpclients) * dumplist.ndl_size;
3020                     dumpclients = (struct nfsd_dumpclients *)malloc(len,
3021                         M_TEMP, M_WAITOK);
3022                     nfsrv_dumpclients(dumpclients, dumplist.ndl_size);
3023                     error = copyout(dumpclients,
3024                         CAST_USER_ADDR_T(dumplist.ndl_list), len);
3025                     free((caddr_t)dumpclients, M_TEMP);
3026                 }
3027         } else if (uap->flag & NFSSVC_DUMPLOCKS) {
3028                 error = copyin(uap->argp, (caddr_t)&dumplocklist,
3029                     sizeof (struct nfsd_dumplocklist));
3030                 if (!error && (dumplocklist.ndllck_size < 1 ||
3031                         dumplocklist.ndllck_size > NFSRV_MAXDUMPLIST))
3032                         error = EPERM;
3033                 if (!error)
3034                         error = nfsrv_lookupfilename(&nd,
3035                                 dumplocklist.ndllck_fname, p);
3036                 if (!error) {
3037                         len = sizeof (struct nfsd_dumplocks) *
3038                                 dumplocklist.ndllck_size;
3039                         dumplocks = (struct nfsd_dumplocks *)malloc(len,
3040                                 M_TEMP, M_WAITOK);
3041                         nfsrv_dumplocks(nd.ni_vp, dumplocks,
3042                             dumplocklist.ndllck_size, p);
3043                         vput(nd.ni_vp);
3044                         error = copyout(dumplocks,
3045                             CAST_USER_ADDR_T(dumplocklist.ndllck_list), len);
3046                         free((caddr_t)dumplocks, M_TEMP);
3047                 }
3048         }
3049         return (error);
3050 }
3051
3052 /*
3053  * Check exports.
3054  * Returns 0 if ok, 1 otherwise.
3055  */
3056 int
3057 nfsvno_testexp(struct nfsrv_descript *nd, struct nfsexstuff *exp)
3058 {
3059         int i;
3060
3061         /*
3062          * This seems odd, but allow the case where the security flavor
3063          * list is empty. This happens when NFSv4 is traversing non-exported
3064          * file systems. Exported file systems should always have a non-empty
3065          * security flavor list.
3066          */
3067         if (exp->nes_numsecflavor == 0)
3068                 return (0);
3069
3070         for (i = 0; i < exp->nes_numsecflavor; i++) {
3071                 /*
3072                  * The tests for privacy and integrity must be first,
3073                  * since ND_GSS is set for everything but AUTH_SYS.
3074                  */
3075                 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5P &&
3076                     (nd->nd_flag & ND_GSSPRIVACY))
3077                         return (0);
3078                 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5I &&
3079                     (nd->nd_flag & ND_GSSINTEGRITY))
3080                         return (0);
3081                 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5 &&
3082                     (nd->nd_flag & ND_GSS))
3083                         return (0);
3084                 if (exp->nes_secflavors[i] == AUTH_SYS &&
3085                     (nd->nd_flag & ND_GSS) == 0)
3086                         return (0);
3087         }
3088         return (1);
3089 }
3090
3091 /*
3092  * Calculate a hash value for the fid in a file handle.
3093  */
3094 uint32_t
3095 nfsrv_hashfh(fhandle_t *fhp)
3096 {
3097         uint32_t hashval;
3098
3099         hashval = hash32_buf(&fhp->fh_fid, sizeof(struct fid), 0);
3100         return (hashval);
3101 }
3102
3103 extern int (*nfsd_call_nfsd)(struct thread *, struct nfssvc_args *);
3104
3105 /*
3106  * Called once to initialize data structures...
3107  */
3108 static int
3109 nfsd_modevent(module_t mod, int type, void *data)
3110 {
3111         int error = 0;
3112         static int loaded = 0;
3113
3114         switch (type) {
3115         case MOD_LOAD:
3116                 if (loaded)
3117                         return (0);
3118                 newnfs_portinit();
3119                 mtx_init(&nfs_cache_mutex, "nfs_cache_mutex", NULL, MTX_DEF);
3120                 mtx_init(&nfs_v4root_mutex, "nfs_v4root_mutex", NULL, MTX_DEF);
3121                 mtx_init(&nfsv4root_mnt.mnt_mtx, "struct mount mtx", NULL,
3122                     MTX_DEF);
3123                 lockinit(&nfsv4root_mnt.mnt_explock, PVFS, "explock", 0, 0);
3124                 nfsrvd_initcache();
3125                 nfsd_init();
3126                 NFSD_LOCK();
3127                 nfsrvd_init(0);
3128                 NFSD_UNLOCK();
3129                 nfsd_mntinit();
3130 #ifdef VV_DISABLEDELEG
3131                 vn_deleg_ops.vndeleg_recall = nfsd_recalldelegation;
3132                 vn_deleg_ops.vndeleg_disable = nfsd_disabledelegation;
3133 #endif
3134                 nfsd_call_servertimer = nfsrv_servertimer;
3135                 nfsd_call_nfsd = nfssvc_nfsd;
3136                 loaded = 1;
3137                 break;
3138
3139         case MOD_UNLOAD:
3140                 if (newnfs_numnfsd != 0) {
3141                         error = EBUSY;
3142                         break;
3143                 }
3144
3145 #ifdef VV_DISABLEDELEG
3146                 vn_deleg_ops.vndeleg_recall = NULL;
3147                 vn_deleg_ops.vndeleg_disable = NULL;
3148 #endif
3149                 nfsd_call_servertimer = NULL;
3150                 nfsd_call_nfsd = NULL;
3151                 /* and get rid of the locks */
3152                 mtx_destroy(&nfs_cache_mutex);
3153                 mtx_destroy(&nfs_v4root_mutex);
3154                 mtx_destroy(&nfsv4root_mnt.mnt_mtx);
3155                 lockdestroy(&nfsv4root_mnt.mnt_explock);
3156                 loaded = 0;
3157                 break;
3158         default:
3159                 error = EOPNOTSUPP;
3160                 break;
3161         }
3162         return error;
3163 }
3164 static moduledata_t nfsd_mod = {
3165         "nfsd",
3166         nfsd_modevent,
3167         NULL,
3168 };
3169 DECLARE_MODULE(nfsd, nfsd_mod, SI_SUB_VFS, SI_ORDER_ANY);
3170
3171 /* So that loader and kldload(2) can find us, wherever we are.. */
3172 MODULE_VERSION(nfsd, 1);
3173 MODULE_DEPEND(nfsd, nfscommon, 1, 1, 1);
3174 MODULE_DEPEND(nfsd, nfslockd, 1, 1, 1);
3175 MODULE_DEPEND(nfsd, krpc, 1, 1, 1);
3176 MODULE_DEPEND(nfsd, nfssvc, 1, 1, 1);
3177