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 #include <sys/capsicum.h>
  38
  39 /*
  40  * Functions that perform the vfs operations required by the routines in
  41  * nfsd_serv.c. It is hoped that this change will make the server more
  42  * portable.
  43  */
  44
  45 #include <fs/nfs/nfsport.h>
  46 #include <sys/hash.h>
  47 #include <sys/sysctl.h>
  48 #include <nlm/nlm_prot.h>
  49 #include <nlm/nlm.h>
  50
  51 FEATURE(nfsd, "NFSv4 server");
  52
  53 extern u_int32_t newnfs_true, newnfs_false, newnfs_xdrneg1;
  54 extern int nfsrv_useacl;
  55 extern int newnfs_numnfsd;
  56 extern struct mount nfsv4root_mnt;
  57 extern struct nfsrv_stablefirst nfsrv_stablefirst;
  58 extern void (*nfsd_call_servertimer)(void);
  59 extern SVCPOOL  *nfsrvd_pool;
  60 extern struct nfsv4lock nfsd_suspend_lock;
  61 extern struct nfssessionhash nfssessionhash[NFSSESSIONHASHSIZE];
  62 struct vfsoptlist nfsv4root_opt, nfsv4root_newopt;
  63 NFSDLOCKMUTEX;
  64 struct nfsrchash_bucket nfsrchash_table[NFSRVCACHE_HASHSIZE];
  65 struct nfsrchash_bucket nfsrcahash_table[NFSRVCACHE_HASHSIZE];
  66 struct mtx nfsrc_udpmtx;
  67 struct mtx nfs_v4root_mutex;
  68 struct nfsrvfh nfs_rootfh, nfs_pubfh;
  69 int nfs_pubfhset = 0, nfs_rootfhset = 0;
  70 struct proc *nfsd_master_proc = NULL;
  71 int nfsd_debuglevel = 0;
  72 static pid_t nfsd_master_pid = (pid_t)-1;
  73 static char nfsd_master_comm[MAXCOMLEN + 1];
  74 static struct timeval nfsd_master_start;
  75 static uint32_t nfsv4_sysid = 0;
  76
  77 static int nfssvc_srvcall(struct thread *, struct nfssvc_args *,
  78     struct ucred *);
  79
  80 int nfsrv_enable_crossmntpt = 1;
  81 static int nfs_commit_blks;
  82 static int nfs_commit_miss;
  83 extern int nfsrv_issuedelegs;
  84 extern int nfsrv_dolocallocks;
  85 extern int nfsd_enable_stringtouid;
  86
  87 SYSCTL_NODE(_vfs, OID_AUTO, nfsd, CTLFLAG_RW, 0, "NFS server");
  88 SYSCTL_INT(_vfs_nfsd, OID_AUTO, mirrormnt, CTLFLAG_RW,
  89     &nfsrv_enable_crossmntpt, 0, "Enable nfsd to cross mount points");
  90 SYSCTL_INT(_vfs_nfsd, OID_AUTO, commit_blks, CTLFLAG_RW, &nfs_commit_blks,
  91     0, "");
  92 SYSCTL_INT(_vfs_nfsd, OID_AUTO, commit_miss, CTLFLAG_RW, &nfs_commit_miss,
  93     0, "");
  94 SYSCTL_INT(_vfs_nfsd, OID_AUTO, issue_delegations, CTLFLAG_RW,
  95     &nfsrv_issuedelegs, 0, "Enable nfsd to issue delegations");
  96 SYSCTL_INT(_vfs_nfsd, OID_AUTO, enable_locallocks, CTLFLAG_RW,
  97     &nfsrv_dolocallocks, 0, "Enable nfsd to acquire local locks on files");
  98 SYSCTL_INT(_vfs_nfsd, OID_AUTO, debuglevel, CTLFLAG_RW, &nfsd_debuglevel,
  99     0, "Debug level for NFS server");
 100 SYSCTL_INT(_vfs_nfsd, OID_AUTO, enable_stringtouid, CTLFLAG_RW,
 101     &nfsd_enable_stringtouid, 0, "Enable nfsd to accept numeric owner_names");
 102
 103 #define MAX_REORDERED_RPC       16
 104 #define NUM_HEURISTIC           1031
 105 #define NHUSE_INIT              64
 106 #define NHUSE_INC               16
 107 #define NHUSE_MAX               2048
 108
 109 static struct nfsheur {
 110         struct vnode *nh_vp;    /* vp to match (unreferenced pointer) */
 111         off_t nh_nextoff;       /* next offset for sequential detection */
 112         int nh_use;             /* use count for selection */
 113         int nh_seqcount;        /* heuristic */
 114 } nfsheur[NUM_HEURISTIC];
 115
 116
 117 /*
 118  * Heuristic to detect sequential operation.
 119  */
 120 static struct nfsheur *
 121 nfsrv_sequential_heuristic(struct uio *uio, struct vnode *vp)
 122 {
 123         struct nfsheur *nh;
 124         int hi, try;
 125
 126         /* Locate best candidate. */
 127         try = 32;
 128         hi = ((int)(vm_offset_t)vp / sizeof(struct vnode)) % NUM_HEURISTIC;
 129         nh = &nfsheur[hi];
 130         while (try--) {
 131                 if (nfsheur[hi].nh_vp == vp) {
 132                         nh = &nfsheur[hi];
 133                         break;
 134                 }
 135                 if (nfsheur[hi].nh_use > 0)
 136                         --nfsheur[hi].nh_use;
 137                 hi = (hi + 1) % NUM_HEURISTIC;
 138                 if (nfsheur[hi].nh_use < nh->nh_use)
 139                         nh = &nfsheur[hi];
 140         }
 141
 142         /* Initialize hint if this is a new file. */
 143         if (nh->nh_vp != vp) {
 144                 nh->nh_vp = vp;
 145                 nh->nh_nextoff = uio->uio_offset;
 146                 nh->nh_use = NHUSE_INIT;
 147                 if (uio->uio_offset == 0)
 148                         nh->nh_seqcount = 4;
 149                 else
 150                         nh->nh_seqcount = 1;
 151         }
 152
 153         /* Calculate heuristic. */
 154         if ((uio->uio_offset == 0 && nh->nh_seqcount > 0) ||
 155             uio->uio_offset == nh->nh_nextoff) {
 156                 /* See comments in vfs_vnops.c:sequential_heuristic(). */
 157                 nh->nh_seqcount += howmany(uio->uio_resid, 16384);
 158                 if (nh->nh_seqcount > IO_SEQMAX)
 159                         nh->nh_seqcount = IO_SEQMAX;
 160         } else if (qabs(uio->uio_offset - nh->nh_nextoff) <= MAX_REORDERED_RPC *
 161             imax(vp->v_mount->mnt_stat.f_iosize, uio->uio_resid)) {
 162                 /* Probably a reordered RPC, leave seqcount alone. */
 163         } else if (nh->nh_seqcount > 1) {
 164                 nh->nh_seqcount /= 2;
 165         } else {
 166                 nh->nh_seqcount = 0;
 167         }
 168         nh->nh_use += NHUSE_INC;
 169         if (nh->nh_use > NHUSE_MAX)
 170                 nh->nh_use = NHUSE_MAX;
 171         return (nh);
 172 }
 173
 174 /*
 175  * Get attributes into nfsvattr structure.
 176  */
 177 int
 178 nfsvno_getattr(struct vnode *vp, struct nfsvattr *nvap, struct ucred *cred,
 179     struct thread *p, int vpislocked)
 180 {
 181         int error, lockedit = 0;
 182
 183         if (vpislocked == 0) {
 184                 /*
 185                  * When vpislocked == 0, the vnode is either exclusively
 186                  * locked by this thread or not locked by this thread.
 187                  * As such, shared lock it, if not exclusively locked.
 188                  */
 189                 if (NFSVOPISLOCKED(vp) != LK_EXCLUSIVE) {
 190                         lockedit = 1;
 191                         NFSVOPLOCK(vp, LK_SHARED | LK_RETRY);
 192                 }
 193         }
 194         error = VOP_GETATTR(vp, &nvap->na_vattr, cred);
 195         if (lockedit != 0)
 196                 NFSVOPUNLOCK(vp, 0);
 197
 198         NFSEXITCODE(error);
 199         return (error);
 200 }
 201
 202 /*
 203  * Get a file handle for a vnode.
 204  */
 205 int
 206 nfsvno_getfh(struct vnode *vp, fhandle_t *fhp, struct thread *p)
 207 {
 208         int error;
 209
 210         NFSBZERO((caddr_t)fhp, sizeof(fhandle_t));
 211         fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid;
 212         error = VOP_VPTOFH(vp, &fhp->fh_fid);
 213
 214         NFSEXITCODE(error);
 215         return (error);
 216 }
 217
 218 /*
 219  * Perform access checking for vnodes obtained from file handles that would
 220  * refer to files already opened by a Unix client. You cannot just use
 221  * vn_writechk() and VOP_ACCESSX() for two reasons.
 222  * 1 - You must check for exported rdonly as well as MNT_RDONLY for the write
 223  *     case.
 224  * 2 - The owner is to be given access irrespective of mode bits for some
 225  *     operations, so that processes that chmod after opening a file don't
 226  *     break.
 227  */
 228 int
 229 nfsvno_accchk(struct vnode *vp, accmode_t accmode, struct ucred *cred,
 230     struct nfsexstuff *exp, struct thread *p, int override, int vpislocked,
 231     u_int32_t *supportedtypep)
 232 {
 233         struct vattr vattr;
 234         int error = 0, getret = 0;
 235
 236         if (vpislocked == 0) {
 237                 if (NFSVOPLOCK(vp, LK_SHARED) != 0) {
 238                         error = EPERM;
 239                         goto out;
 240                 }
 241         }
 242         if (accmode & VWRITE) {
 243                 /* Just vn_writechk() changed to check rdonly */
 244                 /*
 245                  * Disallow write attempts on read-only file systems;
 246                  * unless the file is a socket or a block or character
 247                  * device resident on the file system.
 248                  */
 249                 if (NFSVNO_EXRDONLY(exp) ||
 250                     (vp->v_mount->mnt_flag & MNT_RDONLY)) {
 251                         switch (vp->v_type) {
 252                         case VREG:
 253                         case VDIR:
 254                         case VLNK:
 255                                 error = EROFS;
 256                         default:
 257                                 break;
 258                         }
 259                 }
 260                 /*
 261                  * If there's shared text associated with
 262                  * the inode, try to free it up once.  If
 263                  * we fail, we can't allow writing.
 264                  */
 265                 if (VOP_IS_TEXT(vp) && error == 0)
 266                         error = ETXTBSY;
 267         }
 268         if (error != 0) {
 269                 if (vpislocked == 0)
 270                         NFSVOPUNLOCK(vp, 0);
 271                 goto out;
 272         }
 273
 274         /*
 275          * Should the override still be applied when ACLs are enabled?
 276          */
 277         error = VOP_ACCESSX(vp, accmode, cred, p);
 278         if (error != 0 && (accmode & (VDELETE | VDELETE_CHILD))) {
 279                 /*
 280                  * Try again with VEXPLICIT_DENY, to see if the test for
 281                  * deletion is supported.
 282                  */
 283                 error = VOP_ACCESSX(vp, accmode | VEXPLICIT_DENY, cred, p);
 284                 if (error == 0) {
 285                         if (vp->v_type == VDIR) {
 286                                 accmode &= ~(VDELETE | VDELETE_CHILD);
 287                                 accmode |= VWRITE;
 288                                 error = VOP_ACCESSX(vp, accmode, cred, p);
 289                         } else if (supportedtypep != NULL) {
 290                                 *supportedtypep &= ~NFSACCESS_DELETE;
 291                         }
 292                 }
 293         }
 294
 295         /*
 296          * Allow certain operations for the owner (reads and writes
 297          * on files that are already open).
 298          */
 299         if (override != NFSACCCHK_NOOVERRIDE &&
 300             (error == EPERM || error == EACCES)) {
 301                 if (cred->cr_uid == 0 && (override & NFSACCCHK_ALLOWROOT))
 302                         error = 0;
 303                 else if (override & NFSACCCHK_ALLOWOWNER) {
 304                         getret = VOP_GETATTR(vp, &vattr, cred);
 305                         if (getret == 0 && cred->cr_uid == vattr.va_uid)
 306                                 error = 0;
 307                 }
 308         }
 309         if (vpislocked == 0)
 310                 NFSVOPUNLOCK(vp, 0);
 311
 312 out:
 313         NFSEXITCODE(error);
 314         return (error);
 315 }
 316
 317 /*
 318  * Set attribute(s) vnop.
 319  */
 320 int
 321 nfsvno_setattr(struct vnode *vp, struct nfsvattr *nvap, struct ucred *cred,
 322     struct thread *p, struct nfsexstuff *exp)
 323 {
 324         int error;
 325
 326         error = VOP_SETATTR(vp, &nvap->na_vattr, cred);
 327         NFSEXITCODE(error);
 328         return (error);
 329 }
 330
 331 /*
 332  * Set up nameidata for a lookup() call and do it.
 333  */
 334 int
 335 nfsvno_namei(struct nfsrv_descript *nd, struct nameidata *ndp,
 336     struct vnode *dp, int islocked, struct nfsexstuff *exp, struct thread *p,
 337     struct vnode **retdirp)
 338 {
 339         struct componentname *cnp = &ndp->ni_cnd;
 340         int i;
 341         struct iovec aiov;
 342         struct uio auio;
 343         int lockleaf = (cnp->cn_flags & LOCKLEAF) != 0, linklen;
 344         int error = 0, crossmnt;
 345         char *cp;
 346
 347         *retdirp = NULL;
 348         cnp->cn_nameptr = cnp->cn_pnbuf;
 349         ndp->ni_strictrelative = 0;
 350         /*
 351          * Extract and set starting directory.
 352          */
 353         if (dp->v_type != VDIR) {
 354                 if (islocked)
 355                         vput(dp);
 356                 else
 357                         vrele(dp);
 358                 nfsvno_relpathbuf(ndp);
 359                 error = ENOTDIR;
 360                 goto out1;
 361         }
 362         if (islocked)
 363                 NFSVOPUNLOCK(dp, 0);
 364         VREF(dp);
 365         *retdirp = dp;
 366         if (NFSVNO_EXRDONLY(exp))
 367                 cnp->cn_flags |= RDONLY;
 368         ndp->ni_segflg = UIO_SYSSPACE;
 369         crossmnt = 1;
 370
 371         if (nd->nd_flag & ND_PUBLOOKUP) {
 372                 ndp->ni_loopcnt = 0;
 373                 if (cnp->cn_pnbuf[0] == '/') {
 374                         vrele(dp);
 375                         /*
 376                          * Check for degenerate pathnames here, since lookup()
 377                          * panics on them.
 378                          */
 379                         for (i = 1; i < ndp->ni_pathlen; i++)
 380                                 if (cnp->cn_pnbuf[i] != '/')
 381                                         break;
 382                         if (i == ndp->ni_pathlen) {
 383                                 error = NFSERR_ACCES;
 384                                 goto out;
 385                         }
 386                         dp = rootvnode;
 387                         VREF(dp);
 388                 }
 389         } else if ((nfsrv_enable_crossmntpt == 0 && NFSVNO_EXPORTED(exp)) ||
 390             (nd->nd_flag & ND_NFSV4) == 0) {
 391                 /*
 392                  * Only cross mount points for NFSv4 when doing a
 393                  * mount while traversing the file system above
 394                  * the mount point, unless nfsrv_enable_crossmntpt is set.
 395                  */
 396                 cnp->cn_flags |= NOCROSSMOUNT;
 397                 crossmnt = 0;
 398         }
 399
 400         /*
 401          * Initialize for scan, set ni_startdir and bump ref on dp again
 402          * because lookup() will dereference ni_startdir.
 403          */
 404
 405         cnp->cn_thread = p;
 406         ndp->ni_startdir = dp;
 407         ndp->ni_rootdir = rootvnode;
 408         ndp->ni_topdir = NULL;
 409
 410         if (!lockleaf)
 411                 cnp->cn_flags |= LOCKLEAF;
 412         for (;;) {
 413                 cnp->cn_nameptr = cnp->cn_pnbuf;
 414                 /*
 415                  * Call lookup() to do the real work.  If an error occurs,
 416                  * ndp->ni_vp and ni_dvp are left uninitialized or NULL and
 417                  * we do not have to dereference anything before returning.
 418                  * In either case ni_startdir will be dereferenced and NULLed
 419                  * out.
 420                  */
 421                 error = lookup(ndp);
 422                 if (error)
 423                         break;
 424
 425                 /*
 426                  * Check for encountering a symbolic link.  Trivial
 427                  * termination occurs if no symlink encountered.
 428                  */
 429                 if ((cnp->cn_flags & ISSYMLINK) == 0) {
 430                         if ((cnp->cn_flags & (SAVENAME | SAVESTART)) == 0)
 431                                 nfsvno_relpathbuf(ndp);
 432                         if (ndp->ni_vp && !lockleaf)
 433                                 NFSVOPUNLOCK(ndp->ni_vp, 0);
 434                         break;
 435                 }
 436
 437                 /*
 438                  * Validate symlink
 439                  */
 440                 if ((cnp->cn_flags & LOCKPARENT) && ndp->ni_pathlen == 1)
 441                         NFSVOPUNLOCK(ndp->ni_dvp, 0);
 442                 if (!(nd->nd_flag & ND_PUBLOOKUP)) {
 443                         error = EINVAL;
 444                         goto badlink2;
 445                 }
 446
 447                 if (ndp->ni_loopcnt++ >= MAXSYMLINKS) {
 448                         error = ELOOP;
 449                         goto badlink2;
 450                 }
 451                 if (ndp->ni_pathlen > 1)
 452                         cp = uma_zalloc(namei_zone, M_WAITOK);
 453                 else
 454                         cp = cnp->cn_pnbuf;
 455                 aiov.iov_base = cp;
 456                 aiov.iov_len = MAXPATHLEN;
 457                 auio.uio_iov = &aiov;
 458                 auio.uio_iovcnt = 1;
 459                 auio.uio_offset = 0;
 460                 auio.uio_rw = UIO_READ;
 461                 auio.uio_segflg = UIO_SYSSPACE;
 462                 auio.uio_td = NULL;
 463                 auio.uio_resid = MAXPATHLEN;
 464                 error = VOP_READLINK(ndp->ni_vp, &auio, cnp->cn_cred);
 465                 if (error) {
 466                 badlink1:
 467                         if (ndp->ni_pathlen > 1)
 468                                 uma_zfree(namei_zone, cp);
 469                 badlink2:
 470                         vrele(ndp->ni_dvp);
 471                         vput(ndp->ni_vp);
 472                         break;
 473                 }
 474                 linklen = MAXPATHLEN - auio.uio_resid;
 475                 if (linklen == 0) {
 476                         error = ENOENT;
 477                         goto badlink1;
 478                 }
 479                 if (linklen + ndp->ni_pathlen >= MAXPATHLEN) {
 480                         error = ENAMETOOLONG;
 481                         goto badlink1;
 482                 }
 483
 484                 /*
 485                  * Adjust or replace path
 486                  */
 487                 if (ndp->ni_pathlen > 1) {
 488                         NFSBCOPY(ndp->ni_next, cp + linklen, ndp->ni_pathlen);
 489                         uma_zfree(namei_zone, cnp->cn_pnbuf);
 490                         cnp->cn_pnbuf = cp;
 491                 } else
 492                         cnp->cn_pnbuf[linklen] = '\0';
 493                 ndp->ni_pathlen += linklen;
 494
 495                 /*
 496                  * Cleanup refs for next loop and check if root directory
 497                  * should replace current directory.  Normally ni_dvp
 498                  * becomes the new base directory and is cleaned up when
 499                  * we loop.  Explicitly null pointers after invalidation
 500                  * to clarify operation.
 501                  */
 502                 vput(ndp->ni_vp);
 503                 ndp->ni_vp = NULL;
 504
 505                 if (cnp->cn_pnbuf[0] == '/') {
 506                         vrele(ndp->ni_dvp);
 507                         ndp->ni_dvp = ndp->ni_rootdir;
 508                         VREF(ndp->ni_dvp);
 509                 }
 510                 ndp->ni_startdir = ndp->ni_dvp;
 511                 ndp->ni_dvp = NULL;
 512         }
 513         if (!lockleaf)
 514                 cnp->cn_flags &= ~LOCKLEAF;
 515
 516 out:
 517         if (error) {
 518                 nfsvno_relpathbuf(ndp);
 519                 ndp->ni_vp = NULL;
 520                 ndp->ni_dvp = NULL;
 521                 ndp->ni_startdir = NULL;
 522         } else if ((ndp->ni_cnd.cn_flags & (WANTPARENT|LOCKPARENT)) == 0) {
 523                 ndp->ni_dvp = NULL;
 524         }
 525
 526 out1:
 527         NFSEXITCODE2(error, nd);
 528         return (error);
 529 }
 530
 531 /*
 532  * Set up a pathname buffer and return a pointer to it and, optionally
 533  * set a hash pointer.
 534  */
 535 void
 536 nfsvno_setpathbuf(struct nameidata *ndp, char **bufpp, u_long **hashpp)
 537 {
 538         struct componentname *cnp = &ndp->ni_cnd;
 539
 540         cnp->cn_flags |= (NOMACCHECK | HASBUF);
 541         cnp->cn_pnbuf = uma_zalloc(namei_zone, M_WAITOK);
 542         if (hashpp != NULL)
 543                 *hashpp = NULL;
 544         *bufpp = cnp->cn_pnbuf;
 545 }
 546
 547 /*
 548  * Release the above path buffer, if not released by nfsvno_namei().
 549  */
 550 void
 551 nfsvno_relpathbuf(struct nameidata *ndp)
 552 {
 553
 554         if ((ndp->ni_cnd.cn_flags & HASBUF) == 0)
 555                 panic("nfsrelpath");
 556         uma_zfree(namei_zone, ndp->ni_cnd.cn_pnbuf);
 557         ndp->ni_cnd.cn_flags &= ~HASBUF;
 558 }
 559
 560 /*
 561  * Readlink vnode op into an mbuf list.
 562  */
 563 int
 564 nfsvno_readlink(struct vnode *vp, struct ucred *cred, struct thread *p,
 565     struct mbuf **mpp, struct mbuf **mpendp, int *lenp)
 566 {
 567         struct iovec iv[(NFS_MAXPATHLEN+MLEN-1)/MLEN];
 568         struct iovec *ivp = iv;
 569         struct uio io, *uiop = &io;
 570         struct mbuf *mp, *mp2 = NULL, *mp3 = NULL;
 571         int i, len, tlen, error = 0;
 572
 573         len = 0;
 574         i = 0;
 575         while (len < NFS_MAXPATHLEN) {
 576                 NFSMGET(mp);
 577                 MCLGET(mp, M_WAITOK);
 578                 mp->m_len = M_SIZE(mp);
 579                 if (len == 0) {
 580                         mp3 = mp2 = mp;
 581                 } else {
 582                         mp2->m_next = mp;
 583                         mp2 = mp;
 584                 }
 585                 if ((len + mp->m_len) > NFS_MAXPATHLEN) {
 586                         mp->m_len = NFS_MAXPATHLEN - len;
 587                         len = NFS_MAXPATHLEN;
 588                 } else {
 589                         len += mp->m_len;
 590                 }
 591                 ivp->iov_base = mtod(mp, caddr_t);
 592                 ivp->iov_len = mp->m_len;
 593                 i++;
 594                 ivp++;
 595         }
 596         uiop->uio_iov = iv;
 597         uiop->uio_iovcnt = i;
 598         uiop->uio_offset = 0;
 599         uiop->uio_resid = len;
 600         uiop->uio_rw = UIO_READ;
 601         uiop->uio_segflg = UIO_SYSSPACE;
 602         uiop->uio_td = NULL;
 603         error = VOP_READLINK(vp, uiop, cred);
 604         if (error) {
 605                 m_freem(mp3);
 606                 *lenp = 0;
 607                 goto out;
 608         }
 609         if (uiop->uio_resid > 0) {
 610                 len -= uiop->uio_resid;
 611                 tlen = NFSM_RNDUP(len);
 612                 nfsrv_adj(mp3, NFS_MAXPATHLEN - tlen, tlen - len);
 613         }
 614         *lenp = len;
 615         *mpp = mp3;
 616         *mpendp = mp;
 617
 618 out:
 619         NFSEXITCODE(error);
 620         return (error);
 621 }
 622
 623 /*
 624  * Read vnode op call into mbuf list.
 625  */
 626 int
 627 nfsvno_read(struct vnode *vp, off_t off, int cnt, struct ucred *cred,
 628     struct thread *p, struct mbuf **mpp, struct mbuf **mpendp)
 629 {
 630         struct mbuf *m;
 631         int i;
 632         struct iovec *iv;
 633         struct iovec *iv2;
 634         int error = 0, len, left, siz, tlen, ioflag = 0;
 635         struct mbuf *m2 = NULL, *m3;
 636         struct uio io, *uiop = &io;
 637         struct nfsheur *nh;
 638
 639         len = left = NFSM_RNDUP(cnt);
 640         m3 = NULL;
 641         /*
 642          * Generate the mbuf list with the uio_iov ref. to it.
 643          */
 644         i = 0;
 645         while (left > 0) {
 646                 NFSMGET(m);
 647                 MCLGET(m, M_WAITOK);
 648                 m->m_len = 0;
 649                 siz = min(M_TRAILINGSPACE(m), left);
 650                 left -= siz;
 651                 i++;
 652                 if (m3)
 653                         m2->m_next = m;
 654                 else
 655                         m3 = m;
 656                 m2 = m;
 657         }
 658         MALLOC(iv, struct iovec *, i * sizeof (struct iovec),
 659             M_TEMP, M_WAITOK);
 660         uiop->uio_iov = iv2 = iv;
 661         m = m3;
 662         left = len;
 663         i = 0;
 664         while (left > 0) {
 665                 if (m == NULL)
 666                         panic("nfsvno_read iov");
 667                 siz = min(M_TRAILINGSPACE(m), left);
 668                 if (siz > 0) {
 669                         iv->iov_base = mtod(m, caddr_t) + m->m_len;
 670                         iv->iov_len = siz;
 671                         m->m_len += siz;
 672                         left -= siz;
 673                         iv++;
 674                         i++;
 675                 }
 676                 m = m->m_next;
 677         }
 678         uiop->uio_iovcnt = i;
 679         uiop->uio_offset = off;
 680         uiop->uio_resid = len;
 681         uiop->uio_rw = UIO_READ;
 682         uiop->uio_segflg = UIO_SYSSPACE;
 683         uiop->uio_td = NULL;
 684         nh = nfsrv_sequential_heuristic(uiop, vp);
 685         ioflag |= nh->nh_seqcount << IO_SEQSHIFT;
 686         error = VOP_READ(vp, uiop, IO_NODELOCKED | ioflag, cred);
 687         FREE((caddr_t)iv2, M_TEMP);
 688         if (error) {
 689                 m_freem(m3);
 690                 *mpp = NULL;
 691                 goto out;
 692         }
 693         nh->nh_nextoff = uiop->uio_offset;
 694         tlen = len - uiop->uio_resid;
 695         cnt = cnt < tlen ? cnt : tlen;
 696         tlen = NFSM_RNDUP(cnt);
 697         if (tlen == 0) {
 698                 m_freem(m3);
 699                 m3 = NULL;
 700         } else if (len != tlen || tlen != cnt)
 701                 nfsrv_adj(m3, len - tlen, tlen - cnt);
 702         *mpp = m3;
 703         *mpendp = m2;
 704
 705 out:
 706         NFSEXITCODE(error);
 707         return (error);
 708 }
 709
 710 /*
 711  * Write vnode op from an mbuf list.
 712  */
 713 int
 714 nfsvno_write(struct vnode *vp, off_t off, int retlen, int cnt, int stable,
 715     struct mbuf *mp, char *cp, struct ucred *cred, struct thread *p)
 716 {
 717         struct iovec *ivp;
 718         int i, len;
 719         struct iovec *iv;
 720         int ioflags, error;
 721         struct uio io, *uiop = &io;
 722         struct nfsheur *nh;
 723
 724         MALLOC(ivp, struct iovec *, cnt * sizeof (struct iovec), M_TEMP,
 725             M_WAITOK);
 726         uiop->uio_iov = iv = ivp;
 727         uiop->uio_iovcnt = cnt;
 728         i = mtod(mp, caddr_t) + mp->m_len - cp;
 729         len = retlen;
 730         while (len > 0) {
 731                 if (mp == NULL)
 732                         panic("nfsvno_write");
 733                 if (i > 0) {
 734                         i = min(i, len);
 735                         ivp->iov_base = cp;
 736                         ivp->iov_len = i;
 737                         ivp++;
 738                         len -= i;
 739                 }
 740                 mp = mp->m_next;
 741                 if (mp) {
 742                         i = mp->m_len;
 743                         cp = mtod(mp, caddr_t);
 744                 }
 745         }
 746
 747         if (stable == NFSWRITE_UNSTABLE)
 748                 ioflags = IO_NODELOCKED;
 749         else
 750                 ioflags = (IO_SYNC | IO_NODELOCKED);
 751         uiop->uio_resid = retlen;
 752         uiop->uio_rw = UIO_WRITE;
 753         uiop->uio_segflg = UIO_SYSSPACE;
 754         NFSUIOPROC(uiop, p);
 755         uiop->uio_offset = off;
 756         nh = nfsrv_sequential_heuristic(uiop, vp);
 757         ioflags |= nh->nh_seqcount << IO_SEQSHIFT;
 758         error = VOP_WRITE(vp, uiop, ioflags, cred);
 759         if (error == 0)
 760                 nh->nh_nextoff = uiop->uio_offset;
 761         FREE((caddr_t)iv, M_TEMP);
 762
 763         NFSEXITCODE(error);
 764         return (error);
 765 }
 766
 767 /*
 768  * Common code for creating a regular file (plus special files for V2).
 769  */
 770 int
 771 nfsvno_createsub(struct nfsrv_descript *nd, struct nameidata *ndp,
 772     struct vnode **vpp, struct nfsvattr *nvap, int *exclusive_flagp,
 773     int32_t *cverf, NFSDEV_T rdev, struct thread *p, struct nfsexstuff *exp)
 774 {
 775         u_quad_t tempsize;
 776         int error;
 777
 778         error = nd->nd_repstat;
 779         if (!error && ndp->ni_vp == NULL) {
 780                 if (nvap->na_type == VREG || nvap->na_type == VSOCK) {
 781                         vrele(ndp->ni_startdir);
 782                         error = VOP_CREATE(ndp->ni_dvp,
 783                             &ndp->ni_vp, &ndp->ni_cnd, &nvap->na_vattr);
 784                         vput(ndp->ni_dvp);
 785                         nfsvno_relpathbuf(ndp);
 786                         if (!error) {
 787                                 if (*exclusive_flagp) {
 788                                         *exclusive_flagp = 0;
 789                                         NFSVNO_ATTRINIT(nvap);
 790                                         nvap->na_atime.tv_sec = cverf[0];
 791                                         nvap->na_atime.tv_nsec = cverf[1];
 792                                         error = VOP_SETATTR(ndp->ni_vp,
 793                                             &nvap->na_vattr, nd->nd_cred);
 794                                 }
 795                         }
 796                 /*
 797                  * NFS V2 Only. nfsrvd_mknod() does this for V3.
 798                  * (This implies, just get out on an error.)
 799                  */
 800                 } else if (nvap->na_type == VCHR || nvap->na_type == VBLK ||
 801                         nvap->na_type == VFIFO) {
 802                         if (nvap->na_type == VCHR && rdev == 0xffffffff)
 803                                 nvap->na_type = VFIFO;
 804                         if (nvap->na_type != VFIFO &&
 805                             (error = priv_check_cred(nd->nd_cred,
 806                              PRIV_VFS_MKNOD_DEV, 0))) {
 807                                 vrele(ndp->ni_startdir);
 808                                 nfsvno_relpathbuf(ndp);
 809                                 vput(ndp->ni_dvp);
 810                                 goto out;
 811                         }
 812                         nvap->na_rdev = rdev;
 813                         error = VOP_MKNOD(ndp->ni_dvp, &ndp->ni_vp,
 814                             &ndp->ni_cnd, &nvap->na_vattr);
 815                         vput(ndp->ni_dvp);
 816                         nfsvno_relpathbuf(ndp);
 817                         vrele(ndp->ni_startdir);
 818                         if (error)
 819                                 goto out;
 820                 } else {
 821                         vrele(ndp->ni_startdir);
 822                         nfsvno_relpathbuf(ndp);
 823                         vput(ndp->ni_dvp);
 824                         error = ENXIO;
 825                         goto out;
 826                 }
 827                 *vpp = ndp->ni_vp;
 828         } else {
 829                 /*
 830                  * Handle cases where error is already set and/or
 831                  * the file exists.
 832                  * 1 - clean up the lookup
 833                  * 2 - iff !error and na_size set, truncate it
 834                  */
 835                 vrele(ndp->ni_startdir);
 836                 nfsvno_relpathbuf(ndp);
 837                 *vpp = ndp->ni_vp;
 838                 if (ndp->ni_dvp == *vpp)
 839                         vrele(ndp->ni_dvp);
 840                 else
 841                         vput(ndp->ni_dvp);
 842                 if (!error && nvap->na_size != VNOVAL) {
 843                         error = nfsvno_accchk(*vpp, VWRITE,
 844                             nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
 845                             NFSACCCHK_VPISLOCKED, NULL);
 846                         if (!error) {
 847                                 tempsize = nvap->na_size;
 848                                 NFSVNO_ATTRINIT(nvap);
 849                                 nvap->na_size = tempsize;
 850                                 error = VOP_SETATTR(*vpp,
 851                                     &nvap->na_vattr, nd->nd_cred);
 852                         }
 853                 }
 854                 if (error)
 855                         vput(*vpp);
 856         }
 857
 858 out:
 859         NFSEXITCODE(error);
 860         return (error);
 861 }
 862
 863 /*
 864  * Do a mknod vnode op.
 865  */
 866 int
 867 nfsvno_mknod(struct nameidata *ndp, struct nfsvattr *nvap, struct ucred *cred,
 868     struct thread *p)
 869 {
 870         int error = 0;
 871         enum vtype vtyp;
 872
 873         vtyp = nvap->na_type;
 874         /*
 875          * Iff doesn't exist, create it.
 876          */
 877         if (ndp->ni_vp) {
 878                 vrele(ndp->ni_startdir);
 879                 nfsvno_relpathbuf(ndp);
 880                 vput(ndp->ni_dvp);
 881                 vrele(ndp->ni_vp);
 882                 error = EEXIST;
 883                 goto out;
 884         }
 885         if (vtyp != VCHR && vtyp != VBLK && vtyp != VSOCK && vtyp != VFIFO) {
 886                 vrele(ndp->ni_startdir);
 887                 nfsvno_relpathbuf(ndp);
 888                 vput(ndp->ni_dvp);
 889                 error = NFSERR_BADTYPE;
 890                 goto out;
 891         }
 892         if (vtyp == VSOCK) {
 893                 vrele(ndp->ni_startdir);
 894                 error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp,
 895                     &ndp->ni_cnd, &nvap->na_vattr);
 896                 vput(ndp->ni_dvp);
 897                 nfsvno_relpathbuf(ndp);
 898         } else {
 899                 if (nvap->na_type != VFIFO &&
 900                     (error = priv_check_cred(cred, PRIV_VFS_MKNOD_DEV, 0))) {
 901                         vrele(ndp->ni_startdir);
 902                         nfsvno_relpathbuf(ndp);
 903                         vput(ndp->ni_dvp);
 904                         goto out;
 905                 }
 906                 error = VOP_MKNOD(ndp->ni_dvp, &ndp->ni_vp,
 907                     &ndp->ni_cnd, &nvap->na_vattr);
 908                 vput(ndp->ni_dvp);
 909                 nfsvno_relpathbuf(ndp);
 910                 vrele(ndp->ni_startdir);
 911                 /*
 912                  * Since VOP_MKNOD returns the ni_vp, I can't
 913                  * see any reason to do the lookup.
 914                  */
 915         }
 916
 917 out:
 918         NFSEXITCODE(error);
 919         return (error);
 920 }
 921
 922 /*
 923  * Mkdir vnode op.
 924  */
 925 int
 926 nfsvno_mkdir(struct nameidata *ndp, struct nfsvattr *nvap, uid_t saved_uid,
 927     struct ucred *cred, struct thread *p, struct nfsexstuff *exp)
 928 {
 929         int error = 0;
 930
 931         if (ndp->ni_vp != NULL) {
 932                 if (ndp->ni_dvp == ndp->ni_vp)
 933                         vrele(ndp->ni_dvp);
 934                 else
 935                         vput(ndp->ni_dvp);
 936                 vrele(ndp->ni_vp);
 937                 nfsvno_relpathbuf(ndp);
 938                 error = EEXIST;
 939                 goto out;
 940         }
 941         error = VOP_MKDIR(ndp->ni_dvp, &ndp->ni_vp, &ndp->ni_cnd,
 942             &nvap->na_vattr);
 943         vput(ndp->ni_dvp);
 944         nfsvno_relpathbuf(ndp);
 945
 946 out:
 947         NFSEXITCODE(error);
 948         return (error);
 949 }
 950
 951 /*
 952  * symlink vnode op.
 953  */
 954 int
 955 nfsvno_symlink(struct nameidata *ndp, struct nfsvattr *nvap, char *pathcp,
 956     int pathlen, int not_v2, uid_t saved_uid, struct ucred *cred, struct thread *p,
 957     struct nfsexstuff *exp)
 958 {
 959         int error = 0;
 960
 961         if (ndp->ni_vp) {
 962                 vrele(ndp->ni_startdir);
 963                 nfsvno_relpathbuf(ndp);
 964                 if (ndp->ni_dvp == ndp->ni_vp)
 965                         vrele(ndp->ni_dvp);
 966                 else
 967                         vput(ndp->ni_dvp);
 968                 vrele(ndp->ni_vp);
 969                 error = EEXIST;
 970                 goto out;
 971         }
 972
 973         error = VOP_SYMLINK(ndp->ni_dvp, &ndp->ni_vp, &ndp->ni_cnd,
 974             &nvap->na_vattr, pathcp);
 975         vput(ndp->ni_dvp);
 976         vrele(ndp->ni_startdir);
 977         nfsvno_relpathbuf(ndp);
 978         /*
 979          * Although FreeBSD still had the lookup code in
 980          * it for 7/current, there doesn't seem to be any
 981          * point, since VOP_SYMLINK() returns the ni_vp.
 982          * Just vput it for v2.
 983          */
 984         if (!not_v2 && !error)
 985                 vput(ndp->ni_vp);
 986
 987 out:
 988         NFSEXITCODE(error);
 989         return (error);
 990 }
 991
 992 /*
 993  * Parse symbolic link arguments.
 994  * This function has an ugly side effect. It will MALLOC() an area for
 995  * the symlink and set iov_base to point to it, only if it succeeds.
 996  * So, if it returns with uiop->uio_iov->iov_base != NULL, that must
 997  * be FREE'd later.
 998  */
 999 int
1000 nfsvno_getsymlink(struct nfsrv_descript *nd, struct nfsvattr *nvap,
1001     struct thread *p, char **pathcpp, int *lenp)
1002 {
1003         u_int32_t *tl;
1004         char *pathcp = NULL;
1005         int error = 0, len;
1006         struct nfsv2_sattr *sp;
1007
1008         *pathcpp = NULL;
1009         *lenp = 0;
1010         if ((nd->nd_flag & ND_NFSV3) &&
1011             (error = nfsrv_sattr(nd, NULL, nvap, NULL, NULL, p)))
1012                 goto nfsmout;
1013         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
1014         len = fxdr_unsigned(int, *tl);
1015         if (len > NFS_MAXPATHLEN || len <= 0) {
1016                 error = EBADRPC;
1017                 goto nfsmout;
1018         }
1019         MALLOC(pathcp, caddr_t, len + 1, M_TEMP, M_WAITOK);
1020         error = nfsrv_mtostr(nd, pathcp, len);
1021         if (error)
1022                 goto nfsmout;
1023         if (nd->nd_flag & ND_NFSV2) {
1024                 NFSM_DISSECT(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
1025                 nvap->na_mode = fxdr_unsigned(u_int16_t, sp->sa_mode);
1026         }
1027         *pathcpp = pathcp;
1028         *lenp = len;
1029         NFSEXITCODE2(0, nd);
1030         return (0);
1031 nfsmout:
1032         if (pathcp)
1033                 free(pathcp, M_TEMP);
1034         NFSEXITCODE2(error, nd);
1035         return (error);
1036 }
1037
1038 /*
1039  * Remove a non-directory object.
1040  */
1041 int
1042 nfsvno_removesub(struct nameidata *ndp, int is_v4, struct ucred *cred,
1043     struct thread *p, struct nfsexstuff *exp)
1044 {
1045         struct vnode *vp;
1046         int error = 0;
1047
1048         vp = ndp->ni_vp;
1049         if (vp->v_type == VDIR)
1050                 error = NFSERR_ISDIR;
1051         else if (is_v4)
1052                 error = nfsrv_checkremove(vp, 1, p);
1053         if (!error)
1054                 error = VOP_REMOVE(ndp->ni_dvp, vp, &ndp->ni_cnd);
1055         if (ndp->ni_dvp == vp)
1056                 vrele(ndp->ni_dvp);
1057         else
1058                 vput(ndp->ni_dvp);
1059         vput(vp);
1060         if ((ndp->ni_cnd.cn_flags & SAVENAME) != 0)
1061                 nfsvno_relpathbuf(ndp);
1062         NFSEXITCODE(error);
1063         return (error);
1064 }
1065
1066 /*
1067  * Remove a directory.
1068  */
1069 int
1070 nfsvno_rmdirsub(struct nameidata *ndp, int is_v4, struct ucred *cred,
1071     struct thread *p, struct nfsexstuff *exp)
1072 {
1073         struct vnode *vp;
1074         int error = 0;
1075
1076         vp = ndp->ni_vp;
1077         if (vp->v_type != VDIR) {
1078                 error = ENOTDIR;
1079                 goto out;
1080         }
1081         /*
1082          * No rmdir "." please.
1083          */
1084         if (ndp->ni_dvp == vp) {
1085                 error = EINVAL;
1086                 goto out;
1087         }
1088         /*
1089          * The root of a mounted filesystem cannot be deleted.
1090          */
1091         if (vp->v_vflag & VV_ROOT)
1092                 error = EBUSY;
1093 out:
1094         if (!error)
1095                 error = VOP_RMDIR(ndp->ni_dvp, vp, &ndp->ni_cnd);
1096         if (ndp->ni_dvp == vp)
1097                 vrele(ndp->ni_dvp);
1098         else
1099                 vput(ndp->ni_dvp);
1100         vput(vp);
1101         if ((ndp->ni_cnd.cn_flags & SAVENAME) != 0)
1102                 nfsvno_relpathbuf(ndp);
1103         NFSEXITCODE(error);
1104         return (error);
1105 }
1106
1107 /*
1108  * Rename vnode op.
1109  */
1110 int
1111 nfsvno_rename(struct nameidata *fromndp, struct nameidata *tondp,
1112     u_int32_t ndstat, u_int32_t ndflag, struct ucred *cred, struct thread *p)
1113 {
1114         struct vnode *fvp, *tvp, *tdvp;
1115         int error = 0;
1116
1117         fvp = fromndp->ni_vp;
1118         if (ndstat) {
1119                 vrele(fromndp->ni_dvp);
1120                 vrele(fvp);
1121                 error = ndstat;
1122                 goto out1;
1123         }
1124         tdvp = tondp->ni_dvp;
1125         tvp = tondp->ni_vp;
1126         if (tvp != NULL) {
1127                 if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
1128                         error = (ndflag & ND_NFSV2) ? EISDIR : EEXIST;
1129                         goto out;
1130                 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
1131                         error = (ndflag & ND_NFSV2) ? ENOTDIR : EEXIST;
1132                         goto out;
1133                 }
1134                 if (tvp->v_type == VDIR && tvp->v_mountedhere) {
1135                         error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
1136                         goto out;
1137                 }
1138
1139                 /*
1140                  * A rename to '.' or '..' results in a prematurely
1141                  * unlocked vnode on FreeBSD5, so I'm just going to fail that
1142                  * here.
1143                  */
1144                 if ((tondp->ni_cnd.cn_namelen == 1 &&
1145                      tondp->ni_cnd.cn_nameptr[0] == '.') ||
1146                     (tondp->ni_cnd.cn_namelen == 2 &&
1147                      tondp->ni_cnd.cn_nameptr[0] == '.' &&
1148                      tondp->ni_cnd.cn_nameptr[1] == '.')) {
1149                         error = EINVAL;
1150                         goto out;
1151                 }
1152         }
1153         if (fvp->v_type == VDIR && fvp->v_mountedhere) {
1154                 error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
1155                 goto out;
1156         }
1157         if (fvp->v_mount != tdvp->v_mount) {
1158                 error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
1159                 goto out;
1160         }
1161         if (fvp == tdvp) {
1162                 error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EINVAL;
1163                 goto out;
1164         }
1165         if (fvp == tvp) {
1166                 /*
1167                  * If source and destination are the same, there is nothing to
1168                  * do. Set error to -1 to indicate this.
1169                  */
1170                 error = -1;
1171                 goto out;
1172         }
1173         if (ndflag & ND_NFSV4) {
1174                 if (NFSVOPLOCK(fvp, LK_EXCLUSIVE) == 0) {
1175                         error = nfsrv_checkremove(fvp, 0, p);
1176                         NFSVOPUNLOCK(fvp, 0);
1177                 } else
1178                         error = EPERM;
1179                 if (tvp && !error)
1180                         error = nfsrv_checkremove(tvp, 1, p);
1181         } else {
1182                 /*
1183                  * For NFSv2 and NFSv3, try to get rid of the delegation, so
1184                  * that the NFSv4 client won't be confused by the rename.
1185                  * Since nfsd_recalldelegation() can only be called on an
1186                  * unlocked vnode at this point and fvp is the file that will
1187                  * still exist after the rename, just do fvp.
1188                  */
1189                 nfsd_recalldelegation(fvp, p);
1190         }
1191 out:
1192         if (!error) {
1193                 error = VOP_RENAME(fromndp->ni_dvp, fromndp->ni_vp,
1194                     &fromndp->ni_cnd, tondp->ni_dvp, tondp->ni_vp,
1195                     &tondp->ni_cnd);
1196         } else {
1197                 if (tdvp == tvp)
1198                         vrele(tdvp);
1199                 else
1200                         vput(tdvp);
1201                 if (tvp)
1202                         vput(tvp);
1203                 vrele(fromndp->ni_dvp);
1204                 vrele(fvp);
1205                 if (error == -1)
1206                         error = 0;
1207         }
1208         vrele(tondp->ni_startdir);
1209         nfsvno_relpathbuf(tondp);
1210 out1:
1211         vrele(fromndp->ni_startdir);
1212         nfsvno_relpathbuf(fromndp);
1213         NFSEXITCODE(error);
1214         return (error);
1215 }
1216
1217 /*
1218  * Link vnode op.
1219  */
1220 int
1221 nfsvno_link(struct nameidata *ndp, struct vnode *vp, struct ucred *cred,
1222     struct thread *p, struct nfsexstuff *exp)
1223 {
1224         struct vnode *xp;
1225         int error = 0;
1226
1227         xp = ndp->ni_vp;
1228         if (xp != NULL) {
1229                 error = EEXIST;
1230         } else {
1231                 xp = ndp->ni_dvp;
1232                 if (vp->v_mount != xp->v_mount)
1233                         error = EXDEV;
1234         }
1235         if (!error) {
1236                 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
1237                 if ((vp->v_iflag & VI_DOOMED) == 0)
1238                         error = VOP_LINK(ndp->ni_dvp, vp, &ndp->ni_cnd);
1239                 else
1240                         error = EPERM;
1241                 if (ndp->ni_dvp == vp)
1242                         vrele(ndp->ni_dvp);
1243                 else
1244                         vput(ndp->ni_dvp);
1245                 NFSVOPUNLOCK(vp, 0);
1246         } else {
1247                 if (ndp->ni_dvp == ndp->ni_vp)
1248                         vrele(ndp->ni_dvp);
1249                 else
1250                         vput(ndp->ni_dvp);
1251                 if (ndp->ni_vp)
1252                         vrele(ndp->ni_vp);
1253         }
1254         nfsvno_relpathbuf(ndp);
1255         NFSEXITCODE(error);
1256         return (error);
1257 }
1258
1259 /*
1260  * Do the fsync() appropriate for the commit.
1261  */
1262 int
1263 nfsvno_fsync(struct vnode *vp, u_int64_t off, int cnt, struct ucred *cred,
1264     struct thread *td)
1265 {
1266         int error = 0;
1267
1268         /*
1269          * RFC 1813 3.3.21: if count is 0, a flush from offset to the end of
1270          * file is done.  At this time VOP_FSYNC does not accept offset and
1271          * byte count parameters so call VOP_FSYNC the whole file for now.
1272          * The same is true for NFSv4: RFC 3530 Sec. 14.2.3.
1273          * File systems that do not use the buffer cache (as indicated
1274          * by MNTK_USES_BCACHE not being set) must use VOP_FSYNC().
1275          */
1276         if (cnt == 0 || cnt > MAX_COMMIT_COUNT ||
1277             (vp->v_mount->mnt_kern_flag & MNTK_USES_BCACHE) == 0) {
1278                 /*
1279                  * Give up and do the whole thing
1280                  */
1281                 if (vp->v_object &&
1282                    (vp->v_object->flags & OBJ_MIGHTBEDIRTY)) {
1283                         VM_OBJECT_WLOCK(vp->v_object);
1284                         vm_object_page_clean(vp->v_object, 0, 0, OBJPC_SYNC);
1285                         VM_OBJECT_WUNLOCK(vp->v_object);
1286                 }
1287                 error = VOP_FSYNC(vp, MNT_WAIT, td);
1288         } else {
1289                 /*
1290                  * Locate and synchronously write any buffers that fall
1291                  * into the requested range.  Note:  we are assuming that
1292                  * f_iosize is a power of 2.
1293                  */
1294                 int iosize = vp->v_mount->mnt_stat.f_iosize;
1295                 int iomask = iosize - 1;
1296                 struct bufobj *bo;
1297                 daddr_t lblkno;
1298
1299                 /*
1300                  * Align to iosize boundry, super-align to page boundry.
1301                  */
1302                 if (off & iomask) {
1303                         cnt += off & iomask;
1304                         off &= ~(u_quad_t)iomask;
1305                 }
1306                 if (off & PAGE_MASK) {
1307                         cnt += off & PAGE_MASK;
1308                         off &= ~(u_quad_t)PAGE_MASK;
1309                 }
1310                 lblkno = off / iosize;
1311
1312                 if (vp->v_object &&
1313                    (vp->v_object->flags & OBJ_MIGHTBEDIRTY)) {
1314                         VM_OBJECT_WLOCK(vp->v_object);
1315                         vm_object_page_clean(vp->v_object, off, off + cnt,
1316                             OBJPC_SYNC);
1317                         VM_OBJECT_WUNLOCK(vp->v_object);
1318                 }
1319
1320                 bo = &vp->v_bufobj;
1321                 BO_LOCK(bo);
1322                 while (cnt > 0) {
1323                         struct buf *bp;
1324
1325                         /*
1326                          * If we have a buffer and it is marked B_DELWRI we
1327                          * have to lock and write it.  Otherwise the prior
1328                          * write is assumed to have already been committed.
1329                          *
1330                          * gbincore() can return invalid buffers now so we
1331                          * have to check that bit as well (though B_DELWRI
1332                          * should not be set if B_INVAL is set there could be
1333                          * a race here since we haven't locked the buffer).
1334                          */
1335                         if ((bp = gbincore(&vp->v_bufobj, lblkno)) != NULL) {
1336                                 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_SLEEPFAIL |
1337                                     LK_INTERLOCK, BO_LOCKPTR(bo)) == ENOLCK) {
1338                                         BO_LOCK(bo);
1339                                         continue; /* retry */
1340                                 }
1341                                 if ((bp->b_flags & (B_DELWRI|B_INVAL)) ==
1342                                     B_DELWRI) {
1343                                         bremfree(bp);
1344                                         bp->b_flags &= ~B_ASYNC;
1345                                         bwrite(bp);
1346                                         ++nfs_commit_miss;
1347                                 } else
1348                                         BUF_UNLOCK(bp);
1349                                 BO_LOCK(bo);
1350                         }
1351                         ++nfs_commit_blks;
1352                         if (cnt < iosize)
1353                                 break;
1354                         cnt -= iosize;
1355                         ++lblkno;
1356                 }
1357                 BO_UNLOCK(bo);
1358         }
1359         NFSEXITCODE(error);
1360         return (error);
1361 }
1362
1363 /*
1364  * Statfs vnode op.
1365  */
1366 int
1367 nfsvno_statfs(struct vnode *vp, struct statfs *sf)
1368 {
1369         int error;
1370
1371         error = VFS_STATFS(vp->v_mount, sf);
1372         if (error == 0) {
1373                 /*
1374                  * Since NFS handles these values as unsigned on the
1375                  * wire, there is no way to represent negative values,
1376                  * so set them to 0. Without this, they will appear
1377                  * to be very large positive values for clients like
1378                  * Solaris10.
1379                  */
1380                 if (sf->f_bavail < 0)
1381                         sf->f_bavail = 0;
1382                 if (sf->f_ffree < 0)
1383                         sf->f_ffree = 0;
1384         }
1385         NFSEXITCODE(error);
1386         return (error);
1387 }
1388
1389 /*
1390  * Do the vnode op stuff for Open. Similar to nfsvno_createsub(), but
1391  * must handle nfsrv_opencheck() calls after any other access checks.
1392  */
1393 void
1394 nfsvno_open(struct nfsrv_descript *nd, struct nameidata *ndp,
1395     nfsquad_t clientid, nfsv4stateid_t *stateidp, struct nfsstate *stp,
1396     int *exclusive_flagp, struct nfsvattr *nvap, int32_t *cverf, int create,
1397     NFSACL_T *aclp, nfsattrbit_t *attrbitp, struct ucred *cred, struct thread *p,
1398     struct nfsexstuff *exp, struct vnode **vpp)
1399 {
1400         struct vnode *vp = NULL;
1401         u_quad_t tempsize;
1402         struct nfsexstuff nes;
1403
1404         if (ndp->ni_vp == NULL)
1405                 nd->nd_repstat = nfsrv_opencheck(clientid,
1406                     stateidp, stp, NULL, nd, p, nd->nd_repstat);
1407         if (!nd->nd_repstat) {
1408                 if (ndp->ni_vp == NULL) {
1409                         vrele(ndp->ni_startdir);
1410                         nd->nd_repstat = VOP_CREATE(ndp->ni_dvp,
1411                             &ndp->ni_vp, &ndp->ni_cnd, &nvap->na_vattr);
1412                         vput(ndp->ni_dvp);
1413                         nfsvno_relpathbuf(ndp);
1414                         if (!nd->nd_repstat) {
1415                                 if (*exclusive_flagp) {
1416                                         *exclusive_flagp = 0;
1417                                         NFSVNO_ATTRINIT(nvap);
1418                                         nvap->na_atime.tv_sec = cverf[0];
1419                                         nvap->na_atime.tv_nsec = cverf[1];
1420                                         nd->nd_repstat = VOP_SETATTR(ndp->ni_vp,
1421                                             &nvap->na_vattr, cred);
1422                                 } else {
1423                                         nfsrv_fixattr(nd, ndp->ni_vp, nvap,
1424                                             aclp, p, attrbitp, exp);
1425                                 }
1426                         }
1427                         vp = ndp->ni_vp;
1428                 } else {
1429                         if (ndp->ni_startdir)
1430                                 vrele(ndp->ni_startdir);
1431                         nfsvno_relpathbuf(ndp);
1432                         vp = ndp->ni_vp;
1433                         if (create == NFSV4OPEN_CREATE) {
1434                                 if (ndp->ni_dvp == vp)
1435                                         vrele(ndp->ni_dvp);
1436                                 else
1437                                         vput(ndp->ni_dvp);
1438                         }
1439                         if (NFSVNO_ISSETSIZE(nvap) && vp->v_type == VREG) {
1440                                 if (ndp->ni_cnd.cn_flags & RDONLY)
1441                                         NFSVNO_SETEXRDONLY(&nes);
1442                                 else
1443                                         NFSVNO_EXINIT(&nes);
1444                                 nd->nd_repstat = nfsvno_accchk(vp,
1445                                     VWRITE, cred, &nes, p,
1446                                     NFSACCCHK_NOOVERRIDE,
1447                                     NFSACCCHK_VPISLOCKED, NULL);
1448                                 nd->nd_repstat = nfsrv_opencheck(clientid,
1449                                     stateidp, stp, vp, nd, p, nd->nd_repstat);
1450                                 if (!nd->nd_repstat) {
1451                                         tempsize = nvap->na_size;
1452                                         NFSVNO_ATTRINIT(nvap);
1453                                         nvap->na_size = tempsize;
1454                                         nd->nd_repstat = VOP_SETATTR(vp,
1455                                             &nvap->na_vattr, cred);
1456                                 }
1457                         } else if (vp->v_type == VREG) {
1458                                 nd->nd_repstat = nfsrv_opencheck(clientid,
1459                                     stateidp, stp, vp, nd, p, nd->nd_repstat);
1460                         }
1461                 }
1462         } else {
1463                 if (ndp->ni_cnd.cn_flags & HASBUF)
1464                         nfsvno_relpathbuf(ndp);
1465                 if (ndp->ni_startdir && create == NFSV4OPEN_CREATE) {
1466                         vrele(ndp->ni_startdir);
1467                         if (ndp->ni_dvp == ndp->ni_vp)
1468                                 vrele(ndp->ni_dvp);
1469                         else
1470                                 vput(ndp->ni_dvp);
1471                         if (ndp->ni_vp)
1472                                 vput(ndp->ni_vp);
1473                 }
1474         }
1475         *vpp = vp;
1476
1477         NFSEXITCODE2(0, nd);
1478 }
1479
1480 /*
1481  * Updates the file rev and sets the mtime and ctime
1482  * to the current clock time, returning the va_filerev and va_Xtime
1483  * values.
1484  * Return ESTALE to indicate the vnode is VI_DOOMED.
1485  */
1486 int
1487 nfsvno_updfilerev(struct vnode *vp, struct nfsvattr *nvap,
1488     struct ucred *cred, struct thread *p)
1489 {
1490         struct vattr va;
1491
1492         VATTR_NULL(&va);
1493         vfs_timestamp(&va.va_mtime);
1494         if (NFSVOPISLOCKED(vp) != LK_EXCLUSIVE) {
1495                 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
1496                 if ((vp->v_iflag & VI_DOOMED) != 0)
1497                         return (ESTALE);
1498         }
1499         (void) VOP_SETATTR(vp, &va, cred);
1500         (void) nfsvno_getattr(vp, nvap, cred, p, 1);
1501         return (0);
1502 }
1503
1504 /*
1505  * Glue routine to nfsv4_fillattr().
1506  */
1507 int
1508 nfsvno_fillattr(struct nfsrv_descript *nd, struct mount *mp, struct vnode *vp,
1509     struct nfsvattr *nvap, fhandle_t *fhp, int rderror, nfsattrbit_t *attrbitp,
1510     struct ucred *cred, struct thread *p, int isdgram, int reterr,
1511     int supports_nfsv4acls, int at_root, uint64_t mounted_on_fileno)
1512 {
1513         int error;
1514
1515         error = nfsv4_fillattr(nd, mp, vp, NULL, &nvap->na_vattr, fhp, rderror,
1516             attrbitp, cred, p, isdgram, reterr, supports_nfsv4acls, at_root,
1517             mounted_on_fileno);
1518         NFSEXITCODE2(0, nd);
1519         return (error);
1520 }
1521
1522 /* Since the Readdir vnode ops vary, put the entire functions in here. */
1523 /*
1524  * nfs readdir service
1525  * - mallocs what it thinks is enough to read
1526  *      count rounded up to a multiple of DIRBLKSIZ <= NFS_MAXREADDIR
1527  * - calls VOP_READDIR()
1528  * - loops around building the reply
1529  *      if the output generated exceeds count break out of loop
1530  *      The NFSM_CLGET macro is used here so that the reply will be packed
1531  *      tightly in mbuf clusters.
1532  * - it trims out records with d_fileno == 0
1533  *      this doesn't matter for Unix clients, but they might confuse clients
1534  *      for other os'.
1535  * - it trims out records with d_type == DT_WHT
1536  *      these cannot be seen through NFS (unless we extend the protocol)
1537  *     The alternate call nfsrvd_readdirplus() does lookups as well.
1538  * PS: The NFS protocol spec. does not clarify what the "count" byte
1539  *      argument is a count of.. just name strings and file id's or the
1540  *      entire reply rpc or ...
1541  *      I tried just file name and id sizes and it confused the Sun client,
1542  *      so I am using the full rpc size now. The "paranoia.." comment refers
1543  *      to including the status longwords that are not a part of the dir.
1544  *      "entry" structures, but are in the rpc.
1545  */
1546 int
1547 nfsrvd_readdir(struct nfsrv_descript *nd, int isdgram,
1548     struct vnode *vp, struct thread *p, struct nfsexstuff *exp)
1549 {
1550         struct dirent *dp;
1551         u_int32_t *tl;
1552         int dirlen;
1553         char *cpos, *cend, *rbuf;
1554         struct nfsvattr at;
1555         int nlen, error = 0, getret = 1;
1556         int siz, cnt, fullsiz, eofflag, ncookies;
1557         u_int64_t off, toff, verf;
1558         u_long *cookies = NULL, *cookiep;
1559         struct uio io;
1560         struct iovec iv;
1561         int is_ufs;
1562
1563         if (nd->nd_repstat) {
1564                 nfsrv_postopattr(nd, getret, &at);
1565                 goto out;
1566         }
1567         if (nd->nd_flag & ND_NFSV2) {
1568                 NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1569                 off = fxdr_unsigned(u_quad_t, *tl++);
1570         } else {
1571                 NFSM_DISSECT(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
1572                 off = fxdr_hyper(tl);
1573                 tl += 2;
1574                 verf = fxdr_hyper(tl);
1575                 tl += 2;
1576         }
1577         toff = off;
1578         cnt = fxdr_unsigned(int, *tl);
1579         if (cnt > NFS_SRVMAXDATA(nd) || cnt < 0)
1580                 cnt = NFS_SRVMAXDATA(nd);
1581         siz = ((cnt + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1));
1582         fullsiz = siz;
1583         if (nd->nd_flag & ND_NFSV3) {
1584                 nd->nd_repstat = getret = nfsvno_getattr(vp, &at, nd->nd_cred,
1585                     p, 1);
1586 #if 0
1587                 /*
1588                  * va_filerev is not sufficient as a cookie verifier,
1589                  * since it is not supposed to change when entries are
1590                  * removed/added unless that offset cookies returned to
1591                  * the client are no longer valid.
1592                  */
1593                 if (!nd->nd_repstat && toff && verf != at.na_filerev)
1594                         nd->nd_repstat = NFSERR_BAD_COOKIE;
1595 #endif
1596         }
1597         if (!nd->nd_repstat && vp->v_type != VDIR)
1598                 nd->nd_repstat = NFSERR_NOTDIR;
1599         if (nd->nd_repstat == 0 && cnt == 0) {
1600                 if (nd->nd_flag & ND_NFSV2)
1601                         /* NFSv2 does not have NFSERR_TOOSMALL */
1602                         nd->nd_repstat = EPERM;
1603                 else
1604                         nd->nd_repstat = NFSERR_TOOSMALL;
1605         }
1606         if (!nd->nd_repstat)
1607                 nd->nd_repstat = nfsvno_accchk(vp, VEXEC,
1608                     nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
1609                     NFSACCCHK_VPISLOCKED, NULL);
1610         if (nd->nd_repstat) {
1611                 vput(vp);
1612                 if (nd->nd_flag & ND_NFSV3)
1613                         nfsrv_postopattr(nd, getret, &at);
1614                 goto out;
1615         }
1616         is_ufs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "ufs") == 0;
1617         MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
1618 again:
1619         eofflag = 0;
1620         if (cookies) {
1621                 free((caddr_t)cookies, M_TEMP);
1622                 cookies = NULL;
1623         }
1624
1625         iv.iov_base = rbuf;
1626         iv.iov_len = siz;
1627         io.uio_iov = &iv;
1628         io.uio_iovcnt = 1;
1629         io.uio_offset = (off_t)off;
1630         io.uio_resid = siz;
1631         io.uio_segflg = UIO_SYSSPACE;
1632         io.uio_rw = UIO_READ;
1633         io.uio_td = NULL;
1634         nd->nd_repstat = VOP_READDIR(vp, &io, nd->nd_cred, &eofflag, &ncookies,
1635             &cookies);
1636         off = (u_int64_t)io.uio_offset;
1637         if (io.uio_resid)
1638                 siz -= io.uio_resid;
1639
1640         if (!cookies && !nd->nd_repstat)
1641                 nd->nd_repstat = NFSERR_PERM;
1642         if (nd->nd_flag & ND_NFSV3) {
1643                 getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
1644                 if (!nd->nd_repstat)
1645                         nd->nd_repstat = getret;
1646         }
1647
1648         /*
1649          * Handles the failed cases. nd->nd_repstat == 0 past here.
1650          */
1651         if (nd->nd_repstat) {
1652                 vput(vp);
1653                 free((caddr_t)rbuf, M_TEMP);
1654                 if (cookies)
1655                         free((caddr_t)cookies, M_TEMP);
1656                 if (nd->nd_flag & ND_NFSV3)
1657                         nfsrv_postopattr(nd, getret, &at);
1658                 goto out;
1659         }
1660         /*
1661          * If nothing read, return eof
1662          * rpc reply
1663          */
1664         if (siz == 0) {
1665                 vput(vp);
1666                 if (nd->nd_flag & ND_NFSV2) {
1667                         NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1668                 } else {
1669                         nfsrv_postopattr(nd, getret, &at);
1670                         NFSM_BUILD(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
1671                         txdr_hyper(at.na_filerev, tl);
1672                         tl += 2;
1673                 }
1674                 *tl++ = newnfs_false;
1675                 *tl = newnfs_true;
1676                 FREE((caddr_t)rbuf, M_TEMP);
1677                 FREE((caddr_t)cookies, M_TEMP);
1678                 goto out;
1679         }
1680
1681         /*
1682          * Check for degenerate cases of nothing useful read.
1683          * If so go try again
1684          */
1685         cpos = rbuf;
1686         cend = rbuf + siz;
1687         dp = (struct dirent *)cpos;
1688         cookiep = cookies;
1689
1690         /*
1691          * For some reason FreeBSD's ufs_readdir() chooses to back the
1692          * directory offset up to a block boundary, so it is necessary to
1693          * skip over the records that precede the requested offset. This
1694          * requires the assumption that file offset cookies monotonically
1695          * increase.
1696          */
1697         while (cpos < cend && ncookies > 0 &&
1698             (dp->d_fileno == 0 || dp->d_type == DT_WHT ||
1699              (is_ufs == 1 && ((u_quad_t)(*cookiep)) <= toff))) {
1700                 cpos += dp->d_reclen;
1701                 dp = (struct dirent *)cpos;
1702                 cookiep++;
1703                 ncookies--;
1704         }
1705         if (cpos >= cend || ncookies == 0) {
1706                 siz = fullsiz;
1707                 toff = off;
1708                 goto again;
1709         }
1710         vput(vp);
1711
1712         /*
1713          * dirlen is the size of the reply, including all XDR and must
1714          * not exceed cnt. For NFSv2, RFC1094 didn't clearly indicate
1715          * if the XDR should be included in "count", but to be safe, we do.
1716          * (Include the two booleans at the end of the reply in dirlen now.)
1717          */
1718         if (nd->nd_flag & ND_NFSV3) {
1719                 nfsrv_postopattr(nd, getret, &at);
1720                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1721                 txdr_hyper(at.na_filerev, tl);
1722                 dirlen = NFSX_V3POSTOPATTR + NFSX_VERF + 2 * NFSX_UNSIGNED;
1723         } else {
1724                 dirlen = 2 * NFSX_UNSIGNED;
1725         }
1726
1727         /* Loop through the records and build reply */
1728         while (cpos < cend && ncookies > 0) {
1729                 nlen = dp->d_namlen;
1730                 if (dp->d_fileno != 0 && dp->d_type != DT_WHT &&
1731                         nlen <= NFS_MAXNAMLEN) {
1732                         if (nd->nd_flag & ND_NFSV3)
1733                                 dirlen += (6*NFSX_UNSIGNED + NFSM_RNDUP(nlen));
1734                         else
1735                                 dirlen += (4*NFSX_UNSIGNED + NFSM_RNDUP(nlen));
1736                         if (dirlen > cnt) {
1737                                 eofflag = 0;
1738                                 break;
1739                         }
1740
1741                         /*
1742                          * Build the directory record xdr from
1743                          * the dirent entry.
1744                          */
1745                         if (nd->nd_flag & ND_NFSV3) {
1746                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1747                                 *tl++ = newnfs_true;
1748                                 *tl++ = 0;
1749                         } else {
1750                                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1751                                 *tl++ = newnfs_true;
1752                         }
1753                         *tl = txdr_unsigned(dp->d_fileno);
1754                         (void) nfsm_strtom(nd, dp->d_name, nlen);
1755                         if (nd->nd_flag & ND_NFSV3) {
1756                                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1757                                 *tl++ = 0;
1758                         } else
1759                                 NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
1760                         *tl = txdr_unsigned(*cookiep);
1761                 }
1762                 cpos += dp->d_reclen;
1763                 dp = (struct dirent *)cpos;
1764                 cookiep++;
1765                 ncookies--;
1766         }
1767         if (cpos < cend)
1768                 eofflag = 0;
1769         NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1770         *tl++ = newnfs_false;
1771         if (eofflag)
1772                 *tl = newnfs_true;
1773         else
1774                 *tl = newnfs_false;
1775         FREE((caddr_t)rbuf, M_TEMP);
1776         FREE((caddr_t)cookies, M_TEMP);
1777
1778 out:
1779         NFSEXITCODE2(0, nd);
1780         return (0);
1781 nfsmout:
1782         vput(vp);
1783         NFSEXITCODE2(error, nd);
1784         return (error);
1785 }
1786
1787 /*
1788  * Readdirplus for V3 and Readdir for V4.
1789  */
1790 int
1791 nfsrvd_readdirplus(struct nfsrv_descript *nd, int isdgram,
1792     struct vnode *vp, struct thread *p, struct nfsexstuff *exp)
1793 {
1794         struct dirent *dp;
1795         u_int32_t *tl;
1796         int dirlen;
1797         char *cpos, *cend, *rbuf;
1798         struct vnode *nvp;
1799         fhandle_t nfh;
1800         struct nfsvattr nva, at, *nvap = &nva;
1801         struct mbuf *mb0, *mb1;
1802         struct nfsreferral *refp;
1803         int nlen, r, error = 0, getret = 1, usevget = 1;
1804         int siz, cnt, fullsiz, eofflag, ncookies, entrycnt;
1805         caddr_t bpos0, bpos1;
1806         u_int64_t off, toff, verf;
1807         u_long *cookies = NULL, *cookiep;
1808         nfsattrbit_t attrbits, rderrbits, savbits;
1809         struct uio io;
1810         struct iovec iv;
1811         struct componentname cn;
1812         int at_root, is_ufs, is_zfs, needs_unbusy, supports_nfsv4acls;
1813         struct mount *mp, *new_mp;
1814         uint64_t mounted_on_fileno;
1815
1816         if (nd->nd_repstat) {
1817                 nfsrv_postopattr(nd, getret, &at);
1818                 goto out;
1819         }
1820         NFSM_DISSECT(tl, u_int32_t *, 6 * NFSX_UNSIGNED);
1821         off = fxdr_hyper(tl);
1822         toff = off;
1823         tl += 2;
1824         verf = fxdr_hyper(tl);
1825         tl += 2;
1826         siz = fxdr_unsigned(int, *tl++);
1827         cnt = fxdr_unsigned(int, *tl);
1828
1829         /*
1830          * Use the server's maximum data transfer size as the upper bound
1831          * on reply datalen.
1832          */
1833         if (cnt > NFS_SRVMAXDATA(nd) || cnt < 0)
1834                 cnt = NFS_SRVMAXDATA(nd);
1835
1836         /*
1837          * siz is a "hint" of how much directory information (name, fileid,
1838          * cookie) should be in the reply. At least one client "hints" 0,
1839          * so I set it to cnt for that case. I also round it up to the
1840          * next multiple of DIRBLKSIZ.
1841          */
1842         if (siz <= 0)
1843                 siz = cnt;
1844         siz = ((siz + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1));
1845
1846         if (nd->nd_flag & ND_NFSV4) {
1847                 error = nfsrv_getattrbits(nd, &attrbits, NULL, NULL);
1848                 if (error)
1849                         goto nfsmout;
1850                 NFSSET_ATTRBIT(&savbits, &attrbits);
1851                 NFSCLRNOTFILLABLE_ATTRBIT(&attrbits);
1852                 NFSZERO_ATTRBIT(&rderrbits);
1853                 NFSSETBIT_ATTRBIT(&rderrbits, NFSATTRBIT_RDATTRERROR);
1854         } else {
1855                 NFSZERO_ATTRBIT(&attrbits);
1856         }
1857         fullsiz = siz;
1858         nd->nd_repstat = getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
1859         if (!nd->nd_repstat) {
1860             if (off && verf != at.na_filerev) {
1861                 /*
1862                  * va_filerev is not sufficient as a cookie verifier,
1863                  * since it is not supposed to change when entries are
1864                  * removed/added unless that offset cookies returned to
1865                  * the client are no longer valid.
1866                  */
1867 #if 0
1868                 if (nd->nd_flag & ND_NFSV4) {
1869                         nd->nd_repstat = NFSERR_NOTSAME;
1870                 } else {
1871                         nd->nd_repstat = NFSERR_BAD_COOKIE;
1872                 }
1873 #endif
1874             } else if ((nd->nd_flag & ND_NFSV4) && off == 0 && verf != 0) {
1875                 nd->nd_repstat = NFSERR_BAD_COOKIE;
1876             }
1877         }
1878         if (!nd->nd_repstat && vp->v_type != VDIR)
1879                 nd->nd_repstat = NFSERR_NOTDIR;
1880         if (!nd->nd_repstat && cnt == 0)
1881                 nd->nd_repstat = NFSERR_TOOSMALL;
1882         if (!nd->nd_repstat)
1883                 nd->nd_repstat = nfsvno_accchk(vp, VEXEC,
1884                     nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
1885                     NFSACCCHK_VPISLOCKED, NULL);
1886         if (nd->nd_repstat) {
1887                 vput(vp);
1888                 if (nd->nd_flag & ND_NFSV3)
1889                         nfsrv_postopattr(nd, getret, &at);
1890                 goto out;
1891         }
1892         is_ufs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "ufs") == 0;
1893         is_zfs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "zfs") == 0;
1894
1895         MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
1896 again:
1897         eofflag = 0;
1898         if (cookies) {
1899                 free((caddr_t)cookies, M_TEMP);
1900                 cookies = NULL;
1901         }
1902
1903         iv.iov_base = rbuf;
1904         iv.iov_len = siz;
1905         io.uio_iov = &iv;
1906         io.uio_iovcnt = 1;
1907         io.uio_offset = (off_t)off;
1908         io.uio_resid = siz;
1909         io.uio_segflg = UIO_SYSSPACE;
1910         io.uio_rw = UIO_READ;
1911         io.uio_td = NULL;
1912         nd->nd_repstat = VOP_READDIR(vp, &io, nd->nd_cred, &eofflag, &ncookies,
1913             &cookies);
1914         off = (u_int64_t)io.uio_offset;
1915         if (io.uio_resid)
1916                 siz -= io.uio_resid;
1917
1918         getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
1919
1920         if (!cookies && !nd->nd_repstat)
1921                 nd->nd_repstat = NFSERR_PERM;
1922         if (!nd->nd_repstat)
1923                 nd->nd_repstat = getret;
1924         if (nd->nd_repstat) {
1925                 vput(vp);
1926                 if (cookies)
1927                         free((caddr_t)cookies, M_TEMP);
1928                 free((caddr_t)rbuf, M_TEMP);
1929                 if (nd->nd_flag & ND_NFSV3)
1930                         nfsrv_postopattr(nd, getret, &at);
1931                 goto out;
1932         }
1933         /*
1934          * If nothing read, return eof
1935          * rpc reply
1936          */
1937         if (siz == 0) {
1938                 vput(vp);
1939                 if (nd->nd_flag & ND_NFSV3)
1940                         nfsrv_postopattr(nd, getret, &at);
1941                 NFSM_BUILD(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
1942                 txdr_hyper(at.na_filerev, tl);
1943                 tl += 2;
1944                 *tl++ = newnfs_false;
1945                 *tl = newnfs_true;
1946                 free((caddr_t)cookies, M_TEMP);
1947                 free((caddr_t)rbuf, M_TEMP);
1948                 goto out;
1949         }
1950
1951         /*
1952          * Check for degenerate cases of nothing useful read.
1953          * If so go try again
1954          */
1955         cpos = rbuf;
1956         cend = rbuf + siz;
1957         dp = (struct dirent *)cpos;
1958         cookiep = cookies;
1959
1960         /*
1961          * For some reason FreeBSD's ufs_readdir() chooses to back the
1962          * directory offset up to a block boundary, so it is necessary to
1963          * skip over the records that precede the requested offset. This
1964          * requires the assumption that file offset cookies monotonically
1965          * increase.
1966          */
1967         while (cpos < cend && ncookies > 0 &&
1968           (dp->d_fileno == 0 || dp->d_type == DT_WHT ||
1969            (is_ufs == 1 && ((u_quad_t)(*cookiep)) <= toff) ||
1970            ((nd->nd_flag & ND_NFSV4) &&
1971             ((dp->d_namlen == 1 && dp->d_name[0] == '.') ||
1972              (dp->d_namlen==2 && dp->d_name[0]=='.' && dp->d_name[1]=='.'))))) {
1973                 cpos += dp->d_reclen;
1974                 dp = (struct dirent *)cpos;
1975                 cookiep++;
1976                 ncookies--;
1977         }
1978         if (cpos >= cend || ncookies == 0) {
1979                 siz = fullsiz;
1980                 toff = off;
1981                 goto again;
1982         }
1983
1984         /*
1985          * Busy the file system so that the mount point won't go away
1986          * and, as such, VFS_VGET() can be used safely.
1987          */
1988         mp = vp->v_mount;
1989         vfs_ref(mp);
1990         NFSVOPUNLOCK(vp, 0);
1991         nd->nd_repstat = vfs_busy(mp, 0);
1992         vfs_rel(mp);
1993         if (nd->nd_repstat != 0) {
1994                 vrele(vp);
1995                 free(cookies, M_TEMP);
1996                 free(rbuf, M_TEMP);
1997                 if (nd->nd_flag & ND_NFSV3)
1998                         nfsrv_postopattr(nd, getret, &at);
1999                 goto out;
2000         }
2001
2002         /*
2003          * Check to see if entries in this directory can be safely acquired
2004          * via VFS_VGET() or if a switch to VOP_LOOKUP() is required.
2005          * ZFS snapshot directories need VOP_LOOKUP(), so that any
2006          * automount of the snapshot directory that is required will
2007          * be done.
2008          * This needs to be done here for NFSv4, since NFSv4 never does
2009          * a VFS_VGET() for "." or "..".
2010          */
2011         if (is_zfs == 1) {
2012                 r = VFS_VGET(mp, at.na_fileid, LK_SHARED, &nvp);
2013                 if (r == EOPNOTSUPP) {
2014                         usevget = 0;
2015                         cn.cn_nameiop = LOOKUP;
2016                         cn.cn_lkflags = LK_SHARED | LK_RETRY;
2017                         cn.cn_cred = nd->nd_cred;
2018                         cn.cn_thread = p;
2019                 } else if (r == 0)
2020                         vput(nvp);
2021         }
2022
2023         /*
2024          * Save this position, in case there is an error before one entry
2025          * is created.
2026          */
2027         mb0 = nd->nd_mb;
2028         bpos0 = nd->nd_bpos;
2029
2030         /*
2031          * Fill in the first part of the reply.
2032          * dirlen is the reply length in bytes and cannot exceed cnt.
2033          * (Include the two booleans at the end of the reply in dirlen now,
2034          *  so we recognize when we have exceeded cnt.)
2035          */
2036         if (nd->nd_flag & ND_NFSV3) {
2037                 dirlen = NFSX_V3POSTOPATTR + NFSX_VERF + 2 * NFSX_UNSIGNED;
2038                 nfsrv_postopattr(nd, getret, &at);
2039         } else {
2040                 dirlen = NFSX_VERF + 2 * NFSX_UNSIGNED;
2041         }
2042         NFSM_BUILD(tl, u_int32_t *, NFSX_VERF);
2043         txdr_hyper(at.na_filerev, tl);
2044
2045         /*
2046          * Save this position, in case there is an empty reply needed.
2047          */
2048         mb1 = nd->nd_mb;
2049         bpos1 = nd->nd_bpos;
2050
2051         /* Loop through the records and build reply */
2052         entrycnt = 0;
2053         while (cpos < cend && ncookies > 0 && dirlen < cnt) {
2054                 nlen = dp->d_namlen;
2055                 if (dp->d_fileno != 0 && dp->d_type != DT_WHT &&
2056                     nlen <= NFS_MAXNAMLEN &&
2057                     ((nd->nd_flag & ND_NFSV3) || nlen > 2 ||
2058                      (nlen==2 && (dp->d_name[0]!='.' || dp->d_name[1]!='.'))
2059                       || (nlen == 1 && dp->d_name[0] != '.'))) {
2060                         /*
2061                          * Save the current position in the reply, in case
2062                          * this entry exceeds cnt.
2063                          */
2064                         mb1 = nd->nd_mb;
2065                         bpos1 = nd->nd_bpos;
2066
2067                         /*
2068                          * For readdir_and_lookup get the vnode using
2069                          * the file number.
2070                          */
2071                         nvp = NULL;
2072                         refp = NULL;
2073                         r = 0;
2074                         at_root = 0;
2075                         needs_unbusy = 0;
2076                         new_mp = mp;
2077                         mounted_on_fileno = (uint64_t)dp->d_fileno;
2078                         if ((nd->nd_flag & ND_NFSV3) ||
2079                             NFSNONZERO_ATTRBIT(&savbits)) {
2080                                 if (nd->nd_flag & ND_NFSV4)
2081                                         refp = nfsv4root_getreferral(NULL,
2082                                             vp, dp->d_fileno);
2083                                 if (refp == NULL) {
2084                                         if (usevget)
2085                                                 r = VFS_VGET(mp, dp->d_fileno,
2086                                                     LK_SHARED, &nvp);
2087                                         else
2088                                                 r = EOPNOTSUPP;
2089                                         if (r == EOPNOTSUPP) {
2090                                                 if (usevget) {
2091                                                         usevget = 0;
2092                                                         cn.cn_nameiop = LOOKUP;
2093                                                         cn.cn_lkflags =
2094                                                             LK_SHARED |
2095                                                             LK_RETRY;
2096                                                         cn.cn_cred =
2097                                                             nd->nd_cred;
2098                                                         cn.cn_thread = p;
2099                                                 }
2100                                                 cn.cn_nameptr = dp->d_name;
2101                                                 cn.cn_namelen = nlen;
2102                                                 cn.cn_flags = ISLASTCN |
2103                                                     NOFOLLOW | LOCKLEAF;
2104                                                 if (nlen == 2 &&
2105                                                     dp->d_name[0] == '.' &&
2106                                                     dp->d_name[1] == '.')
2107                                                         cn.cn_flags |=
2108                                                             ISDOTDOT;
2109                                                 if (NFSVOPLOCK(vp, LK_SHARED)
2110                                                     != 0) {
2111                                                         nd->nd_repstat = EPERM;
2112                                                         break;
2113                                                 }
2114                                                 if ((vp->v_vflag & VV_ROOT) != 0
2115                                                     && (cn.cn_flags & ISDOTDOT)
2116                                                     != 0) {
2117                                                         vref(vp);
2118                                                         nvp = vp;
2119                                                         r = 0;
2120                                                 } else {
2121                                                         r = VOP_LOOKUP(vp, &nvp,
2122                                                             &cn);
2123                                                         if (vp != nvp)
2124                                                                 NFSVOPUNLOCK(vp,
2125                                                                     0);
2126                                                 }
2127                                         }
2128
2129                                         /*
2130                                          * For NFSv4, check to see if nvp is
2131                                          * a mount point and get the mount
2132                                          * point vnode, as required.
2133                                          */
2134                                         if (r == 0 &&
2135                                             nfsrv_enable_crossmntpt != 0 &&
2136                                             (nd->nd_flag & ND_NFSV4) != 0 &&
2137                                             nvp->v_type == VDIR &&
2138                                             nvp->v_mountedhere != NULL) {
2139                                                 new_mp = nvp->v_mountedhere;
2140                                                 r = vfs_busy(new_mp, 0);
2141                                                 vput(nvp);
2142                                                 nvp = NULL;
2143                                                 if (r == 0) {
2144                                                         r = VFS_ROOT(new_mp,
2145                                                             LK_SHARED, &nvp);
2146                                                         needs_unbusy = 1;
2147                                                         if (r == 0)
2148                                                                 at_root = 1;
2149                                                 }
2150                                         }
2151                                 }
2152                                 if (!r) {
2153                                     if (refp == NULL &&
2154                                         ((nd->nd_flag & ND_NFSV3) ||
2155                                          NFSNONZERO_ATTRBIT(&attrbits))) {
2156                                         r = nfsvno_getfh(nvp, &nfh, p);
2157                                         if (!r)
2158                                             r = nfsvno_getattr(nvp, nvap,
2159                                                 nd->nd_cred, p, 1);
2160                                         if (r == 0 && is_zfs == 1 &&
2161                                             nfsrv_enable_crossmntpt != 0 &&
2162                                             (nd->nd_flag & ND_NFSV4) != 0 &&
2163                                             nvp->v_type == VDIR &&
2164                                             vp->v_mount != nvp->v_mount) {
2165                                             /*
2166                                              * For a ZFS snapshot, there is a
2167                                              * pseudo mount that does not set
2168                                              * v_mountedhere, so it needs to
2169                                              * be detected via a different
2170                                              * mount structure.
2171                                              */
2172                                             at_root = 1;
2173                                             if (new_mp == mp)
2174                                                 new_mp = nvp->v_mount;
2175                                         }
2176                                     }
2177                                 } else {
2178                                     nvp = NULL;
2179                                 }
2180                                 if (r) {
2181                                         if (!NFSISSET_ATTRBIT(&attrbits,
2182                                             NFSATTRBIT_RDATTRERROR)) {
2183                                                 if (nvp != NULL)
2184                                                         vput(nvp);
2185                                                 if (needs_unbusy != 0)
2186                                                         vfs_unbusy(new_mp);
2187                                                 nd->nd_repstat = r;
2188                                                 break;
2189                                         }
2190                                 }
2191                         }
2192
2193                         /*
2194                          * Build the directory record xdr
2195                          */
2196                         if (nd->nd_flag & ND_NFSV3) {
2197                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
2198                                 *tl++ = newnfs_true;
2199                                 *tl++ = 0;
2200                                 *tl = txdr_unsigned(dp->d_fileno);
2201                                 dirlen += nfsm_strtom(nd, dp->d_name, nlen);
2202                                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2203                                 *tl++ = 0;
2204                                 *tl = txdr_unsigned(*cookiep);
2205                                 nfsrv_postopattr(nd, 0, nvap);
2206                                 dirlen += nfsm_fhtom(nd,(u_int8_t *)&nfh,0,1);
2207                                 dirlen += (5*NFSX_UNSIGNED+NFSX_V3POSTOPATTR);
2208                                 if (nvp != NULL)
2209                                         vput(nvp);
2210                         } else {
2211                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
2212                                 *tl++ = newnfs_true;
2213                                 *tl++ = 0;
2214                                 *tl = txdr_unsigned(*cookiep);
2215                                 dirlen += nfsm_strtom(nd, dp->d_name, nlen);
2216                                 if (nvp != NULL) {
2217                                         supports_nfsv4acls =
2218                                             nfs_supportsnfsv4acls(nvp);
2219                                         NFSVOPUNLOCK(nvp, 0);
2220                                 } else
2221                                         supports_nfsv4acls = 0;
2222                                 if (refp != NULL) {
2223                                         dirlen += nfsrv_putreferralattr(nd,
2224                                             &savbits, refp, 0,
2225                                             &nd->nd_repstat);
2226                                         if (nd->nd_repstat) {
2227                                                 if (nvp != NULL)
2228                                                         vrele(nvp);
2229                                                 if (needs_unbusy != 0)
2230                                                         vfs_unbusy(new_mp);
2231                                                 break;
2232                                         }
2233                                 } else if (r) {
2234                                         dirlen += nfsvno_fillattr(nd, new_mp,
2235                                             nvp, nvap, &nfh, r, &rderrbits,
2236                                             nd->nd_cred, p, isdgram, 0,
2237                                             supports_nfsv4acls, at_root,
2238                                             mounted_on_fileno);
2239                                 } else {
2240                                         dirlen += nfsvno_fillattr(nd, new_mp,
2241                                             nvp, nvap, &nfh, r, &attrbits,
2242                                             nd->nd_cred, p, isdgram, 0,
2243                                             supports_nfsv4acls, at_root,
2244                                             mounted_on_fileno);
2245                                 }
2246                                 if (nvp != NULL)
2247                                         vrele(nvp);
2248                                 dirlen += (3 * NFSX_UNSIGNED);
2249                         }
2250                         if (needs_unbusy != 0)
2251                                 vfs_unbusy(new_mp);
2252                         if (dirlen <= cnt)
2253                                 entrycnt++;
2254                 }
2255                 cpos += dp->d_reclen;
2256                 dp = (struct dirent *)cpos;
2257                 cookiep++;
2258                 ncookies--;
2259         }
2260         vrele(vp);
2261         vfs_unbusy(mp);
2262
2263         /*
2264          * If dirlen > cnt, we must strip off the last entry. If that
2265          * results in an empty reply, report NFSERR_TOOSMALL.
2266          */
2267         if (dirlen > cnt || nd->nd_repstat) {
2268                 if (!nd->nd_repstat && entrycnt == 0)
2269                         nd->nd_repstat = NFSERR_TOOSMALL;
2270                 if (nd->nd_repstat) {
2271                         newnfs_trimtrailing(nd, mb0, bpos0);
2272                         if (nd->nd_flag & ND_NFSV3)
2273                                 nfsrv_postopattr(nd, getret, &at);
2274                 } else
2275                         newnfs_trimtrailing(nd, mb1, bpos1);
2276                 eofflag = 0;
2277         } else if (cpos < cend)
2278                 eofflag = 0;
2279         if (!nd->nd_repstat) {
2280                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2281                 *tl++ = newnfs_false;
2282                 if (eofflag)
2283                         *tl = newnfs_true;
2284                 else
2285                         *tl = newnfs_false;
2286         }
2287         FREE((caddr_t)cookies, M_TEMP);
2288         FREE((caddr_t)rbuf, M_TEMP);
2289
2290 out:
2291         NFSEXITCODE2(0, nd);
2292         return (0);
2293 nfsmout:
2294         vput(vp);
2295         NFSEXITCODE2(error, nd);
2296         return (error);
2297 }
2298
2299 /*
2300  * Get the settable attributes out of the mbuf list.
2301  * (Return 0 or EBADRPC)
2302  */
2303 int
2304 nfsrv_sattr(struct nfsrv_descript *nd, vnode_t vp, struct nfsvattr *nvap,
2305     nfsattrbit_t *attrbitp, NFSACL_T *aclp, struct thread *p)
2306 {
2307         u_int32_t *tl;
2308         struct nfsv2_sattr *sp;
2309         int error = 0, toclient = 0;
2310
2311         switch (nd->nd_flag & (ND_NFSV2 | ND_NFSV3 | ND_NFSV4)) {
2312         case ND_NFSV2:
2313                 NFSM_DISSECT(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
2314                 /*
2315                  * Some old clients didn't fill in the high order 16bits.
2316                  * --> check the low order 2 bytes for 0xffff
2317                  */
2318                 if ((fxdr_unsigned(int, sp->sa_mode) & 0xffff) != 0xffff)
2319                         nvap->na_mode = nfstov_mode(sp->sa_mode);
2320                 if (sp->sa_uid != newnfs_xdrneg1)
2321                         nvap->na_uid = fxdr_unsigned(uid_t, sp->sa_uid);
2322                 if (sp->sa_gid != newnfs_xdrneg1)
2323                         nvap->na_gid = fxdr_unsigned(gid_t, sp->sa_gid);
2324                 if (sp->sa_size != newnfs_xdrneg1)
2325                         nvap->na_size = fxdr_unsigned(u_quad_t, sp->sa_size);
2326                 if (sp->sa_atime.nfsv2_sec != newnfs_xdrneg1) {
2327 #ifdef notyet
2328                         fxdr_nfsv2time(&sp->sa_atime, &nvap->na_atime);
2329 #else
2330                         nvap->na_atime.tv_sec =
2331                                 fxdr_unsigned(u_int32_t,sp->sa_atime.nfsv2_sec);
2332                         nvap->na_atime.tv_nsec = 0;
2333 #endif
2334                 }
2335                 if (sp->sa_mtime.nfsv2_sec != newnfs_xdrneg1)
2336                         fxdr_nfsv2time(&sp->sa_mtime, &nvap->na_mtime);
2337                 break;
2338         case ND_NFSV3:
2339                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2340                 if (*tl == newnfs_true) {
2341                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2342                         nvap->na_mode = nfstov_mode(*tl);
2343                 }
2344                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2345                 if (*tl == newnfs_true) {
2346                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2347                         nvap->na_uid = fxdr_unsigned(uid_t, *tl);
2348                 }
2349                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2350                 if (*tl == newnfs_true) {
2351                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2352                         nvap->na_gid = fxdr_unsigned(gid_t, *tl);
2353                 }
2354                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2355                 if (*tl == newnfs_true) {
2356                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2357                         nvap->na_size = fxdr_hyper(tl);
2358                 }
2359                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2360                 switch (fxdr_unsigned(int, *tl)) {
2361                 case NFSV3SATTRTIME_TOCLIENT:
2362                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2363                         fxdr_nfsv3time(tl, &nvap->na_atime);
2364                         toclient = 1;
2365                         break;
2366                 case NFSV3SATTRTIME_TOSERVER:
2367                         vfs_timestamp(&nvap->na_atime);
2368                         nvap->na_vaflags |= VA_UTIMES_NULL;
2369                         break;
2370                 };
2371                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2372                 switch (fxdr_unsigned(int, *tl)) {
2373                 case NFSV3SATTRTIME_TOCLIENT:
2374                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2375                         fxdr_nfsv3time(tl, &nvap->na_mtime);
2376                         nvap->na_vaflags &= ~VA_UTIMES_NULL;
2377                         break;
2378                 case NFSV3SATTRTIME_TOSERVER:
2379                         vfs_timestamp(&nvap->na_mtime);
2380                         if (!toclient)
2381                                 nvap->na_vaflags |= VA_UTIMES_NULL;
2382                         break;
2383                 };
2384                 break;
2385         case ND_NFSV4:
2386                 error = nfsv4_sattr(nd, vp, nvap, attrbitp, aclp, p);
2387         };
2388 nfsmout:
2389         NFSEXITCODE2(error, nd);
2390         return (error);
2391 }
2392
2393 /*
2394  * Handle the setable attributes for V4.
2395  * Returns NFSERR_BADXDR if it can't be parsed, 0 otherwise.
2396  */
2397 int
2398 nfsv4_sattr(struct nfsrv_descript *nd, vnode_t vp, struct nfsvattr *nvap,
2399     nfsattrbit_t *attrbitp, NFSACL_T *aclp, struct thread *p)
2400 {
2401         u_int32_t *tl;
2402         int attrsum = 0;
2403         int i, j;
2404         int error, attrsize, bitpos, aclsize, aceerr, retnotsup = 0;
2405         int toclient = 0;
2406         u_char *cp, namestr[NFSV4_SMALLSTR + 1];
2407         uid_t uid;
2408         gid_t gid;
2409
2410         error = nfsrv_getattrbits(nd, attrbitp, NULL, &retnotsup);
2411         if (error)
2412                 goto nfsmout;
2413         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2414         attrsize = fxdr_unsigned(int, *tl);
2415
2416         /*
2417          * Loop around getting the setable attributes. If an unsupported
2418          * one is found, set nd_repstat == NFSERR_ATTRNOTSUPP and return.
2419          */
2420         if (retnotsup) {
2421                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2422                 bitpos = NFSATTRBIT_MAX;
2423         } else {
2424                 bitpos = 0;
2425         }
2426         for (; bitpos < NFSATTRBIT_MAX; bitpos++) {
2427             if (attrsum > attrsize) {
2428                 error = NFSERR_BADXDR;
2429                 goto nfsmout;
2430             }
2431             if (NFSISSET_ATTRBIT(attrbitp, bitpos))
2432                 switch (bitpos) {
2433                 case NFSATTRBIT_SIZE:
2434                         NFSM_DISSECT(tl, u_int32_t *, NFSX_HYPER);
2435                      if (vp != NULL && vp->v_type != VREG) {
2436                             error = (vp->v_type == VDIR) ? NFSERR_ISDIR :
2437                                 NFSERR_INVAL;
2438                             goto nfsmout;
2439                         }
2440                         nvap->na_size = fxdr_hyper(tl);
2441                         attrsum += NFSX_HYPER;
2442                         break;
2443                 case NFSATTRBIT_ACL:
2444                         error = nfsrv_dissectacl(nd, aclp, &aceerr, &aclsize,
2445                             p);
2446                         if (error)
2447                                 goto nfsmout;
2448                         if (aceerr && !nd->nd_repstat)
2449                                 nd->nd_repstat = aceerr;
2450                         attrsum += aclsize;
2451                         break;
2452                 case NFSATTRBIT_ARCHIVE:
2453                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2454                         if (!nd->nd_repstat)
2455                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2456                         attrsum += NFSX_UNSIGNED;
2457                         break;
2458                 case NFSATTRBIT_HIDDEN:
2459                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2460                         if (!nd->nd_repstat)
2461                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2462                         attrsum += NFSX_UNSIGNED;
2463                         break;
2464                 case NFSATTRBIT_MIMETYPE:
2465                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2466                         i = fxdr_unsigned(int, *tl);
2467                         error = nfsm_advance(nd, NFSM_RNDUP(i), -1);
2468                         if (error)
2469                                 goto nfsmout;
2470                         if (!nd->nd_repstat)
2471                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2472                         attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(i));
2473                         break;
2474                 case NFSATTRBIT_MODE:
2475                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2476                         nvap->na_mode = nfstov_mode(*tl);
2477                         attrsum += NFSX_UNSIGNED;
2478                         break;
2479                 case NFSATTRBIT_OWNER:
2480                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2481                         j = fxdr_unsigned(int, *tl);
2482                         if (j < 0) {
2483                                 error = NFSERR_BADXDR;
2484                                 goto nfsmout;
2485                         }
2486                         if (j > NFSV4_SMALLSTR)
2487                                 cp = malloc(j + 1, M_NFSSTRING, M_WAITOK);
2488                         else
2489                                 cp = namestr;
2490                         error = nfsrv_mtostr(nd, cp, j);
2491                         if (error) {
2492                                 if (j > NFSV4_SMALLSTR)
2493                                         free(cp, M_NFSSTRING);
2494                                 goto nfsmout;
2495                         }
2496                         if (!nd->nd_repstat) {
2497                                 nd->nd_repstat = nfsv4_strtouid(nd, cp, j, &uid,
2498                                     p);
2499                                 if (!nd->nd_repstat)
2500                                         nvap->na_uid = uid;
2501                         }
2502                         if (j > NFSV4_SMALLSTR)
2503                                 free(cp, M_NFSSTRING);
2504                         attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(j));
2505                         break;
2506                 case NFSATTRBIT_OWNERGROUP:
2507                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2508                         j = fxdr_unsigned(int, *tl);
2509                         if (j < 0) {
2510                                 error = NFSERR_BADXDR;
2511                                 goto nfsmout;
2512                         }
2513                         if (j > NFSV4_SMALLSTR)
2514                                 cp = malloc(j + 1, M_NFSSTRING, M_WAITOK);
2515                         else
2516                                 cp = namestr;
2517                         error = nfsrv_mtostr(nd, cp, j);
2518                         if (error) {
2519                                 if (j > NFSV4_SMALLSTR)
2520                                         free(cp, M_NFSSTRING);
2521                                 goto nfsmout;
2522                         }
2523                         if (!nd->nd_repstat) {
2524                                 nd->nd_repstat = nfsv4_strtogid(nd, cp, j, &gid,
2525                                     p);
2526                                 if (!nd->nd_repstat)
2527                                         nvap->na_gid = gid;
2528                         }
2529                         if (j > NFSV4_SMALLSTR)
2530                                 free(cp, M_NFSSTRING);
2531                         attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(j));
2532                         break;
2533                 case NFSATTRBIT_SYSTEM:
2534                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2535                         if (!nd->nd_repstat)
2536                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2537                         attrsum += NFSX_UNSIGNED;
2538                         break;
2539                 case NFSATTRBIT_TIMEACCESSSET:
2540                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2541                         attrsum += NFSX_UNSIGNED;
2542                         if (fxdr_unsigned(int, *tl)==NFSV4SATTRTIME_TOCLIENT) {
2543                             NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2544                             fxdr_nfsv4time(tl, &nvap->na_atime);
2545                             toclient = 1;
2546                             attrsum += NFSX_V4TIME;
2547                         } else {
2548                             vfs_timestamp(&nvap->na_atime);
2549                             nvap->na_vaflags |= VA_UTIMES_NULL;
2550                         }
2551                         break;
2552                 case NFSATTRBIT_TIMEBACKUP:
2553                         NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2554                         if (!nd->nd_repstat)
2555                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2556                         attrsum += NFSX_V4TIME;
2557                         break;
2558                 case NFSATTRBIT_TIMECREATE:
2559                         NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2560                         if (!nd->nd_repstat)
2561                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2562                         attrsum += NFSX_V4TIME;
2563                         break;
2564                 case NFSATTRBIT_TIMEMODIFYSET:
2565                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2566                         attrsum += NFSX_UNSIGNED;
2567                         if (fxdr_unsigned(int, *tl)==NFSV4SATTRTIME_TOCLIENT) {
2568                             NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2569                             fxdr_nfsv4time(tl, &nvap->na_mtime);
2570                             nvap->na_vaflags &= ~VA_UTIMES_NULL;
2571                             attrsum += NFSX_V4TIME;
2572                         } else {
2573                             vfs_timestamp(&nvap->na_mtime);
2574                             if (!toclient)
2575                                 nvap->na_vaflags |= VA_UTIMES_NULL;
2576                         }
2577                         break;
2578                 default:
2579                         nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2580                         /*
2581                          * set bitpos so we drop out of the loop.
2582                          */
2583                         bitpos = NFSATTRBIT_MAX;
2584                         break;
2585                 };
2586         }
2587
2588         /*
2589          * some clients pad the attrlist, so we need to skip over the
2590          * padding.
2591          */
2592         if (attrsum > attrsize) {
2593                 error = NFSERR_BADXDR;
2594         } else {
2595                 attrsize = NFSM_RNDUP(attrsize);
2596                 if (attrsum < attrsize)
2597                         error = nfsm_advance(nd, attrsize - attrsum, -1);
2598         }
2599 nfsmout:
2600         NFSEXITCODE2(error, nd);
2601         return (error);
2602 }
2603
2604 /*
2605  * Check/setup export credentials.
2606  */
2607 int
2608 nfsd_excred(struct nfsrv_descript *nd, struct nfsexstuff *exp,
2609     struct ucred *credanon)
2610 {
2611         int error = 0;
2612
2613         /*
2614          * Check/setup credentials.
2615          */
2616         if (nd->nd_flag & ND_GSS)
2617                 exp->nes_exflag &= ~MNT_EXPORTANON;
2618
2619         /*
2620          * Check to see if the operation is allowed for this security flavor.
2621          * RFC2623 suggests that the NFSv3 Fsinfo RPC be allowed to
2622          * AUTH_NONE or AUTH_SYS for file systems requiring RPCSEC_GSS.
2623          * Also, allow Secinfo, so that it can acquire the correct flavor(s).
2624          */
2625         if (nfsvno_testexp(nd, exp) &&
2626             nd->nd_procnum != NFSV4OP_SECINFO &&
2627             nd->nd_procnum != NFSPROC_FSINFO) {
2628                 if (nd->nd_flag & ND_NFSV4)
2629                         error = NFSERR_WRONGSEC;
2630                 else
2631                         error = (NFSERR_AUTHERR | AUTH_TOOWEAK);
2632                 goto out;
2633         }
2634
2635         /*
2636          * Check to see if the file system is exported V4 only.
2637          */
2638         if (NFSVNO_EXV4ONLY(exp) && !(nd->nd_flag & ND_NFSV4)) {
2639                 error = NFSERR_PROGNOTV4;
2640                 goto out;
2641         }
2642
2643         /*
2644          * Now, map the user credentials.
2645          * (Note that ND_AUTHNONE will only be set for an NFSv3
2646          *  Fsinfo RPC. If set for anything else, this code might need
2647          *  to change.)
2648          */
2649         if (NFSVNO_EXPORTED(exp) &&
2650             ((!(nd->nd_flag & ND_GSS) && nd->nd_cred->cr_uid == 0) ||
2651              NFSVNO_EXPORTANON(exp) ||
2652              (nd->nd_flag & ND_AUTHNONE))) {
2653                 nd->nd_cred->cr_uid = credanon->cr_uid;
2654                 nd->nd_cred->cr_gid = credanon->cr_gid;
2655                 crsetgroups(nd->nd_cred, credanon->cr_ngroups,
2656                     credanon->cr_groups);
2657         }
2658
2659 out:
2660         NFSEXITCODE2(error, nd);
2661         return (error);
2662 }
2663
2664 /*
2665  * Check exports.
2666  */
2667 int
2668 nfsvno_checkexp(struct mount *mp, struct sockaddr *nam, struct nfsexstuff *exp,
2669     struct ucred **credp)
2670 {
2671         int i, error, *secflavors;
2672
2673         error = VFS_CHECKEXP(mp, nam, &exp->nes_exflag, credp,
2674             &exp->nes_numsecflavor, &secflavors);
2675         if (error) {
2676                 if (nfs_rootfhset) {
2677                         exp->nes_exflag = 0;
2678                         exp->nes_numsecflavor = 0;
2679                         error = 0;
2680                 }
2681         } else {
2682                 /* Copy the security flavors. */
2683                 for (i = 0; i < exp->nes_numsecflavor; i++)
2684                         exp->nes_secflavors[i] = secflavors[i];
2685         }
2686         NFSEXITCODE(error);
2687         return (error);
2688 }
2689
2690 /*
2691  * Get a vnode for a file handle and export stuff.
2692  */
2693 int
2694 nfsvno_fhtovp(struct mount *mp, fhandle_t *fhp, struct sockaddr *nam,
2695     int lktype, struct vnode **vpp, struct nfsexstuff *exp,
2696     struct ucred **credp)
2697 {
2698         int i, error, *secflavors;
2699
2700         *credp = NULL;
2701         exp->nes_numsecflavor = 0;
2702         error = VFS_FHTOVP(mp, &fhp->fh_fid, lktype, vpp);
2703         if (error != 0)
2704                 /* Make sure the server replies ESTALE to the client. */
2705                 error = ESTALE;
2706         if (nam && !error) {
2707                 error = VFS_CHECKEXP(mp, nam, &exp->nes_exflag, credp,
2708                     &exp->nes_numsecflavor, &secflavors);
2709                 if (error) {
2710                         if (nfs_rootfhset) {
2711                                 exp->nes_exflag = 0;
2712                                 exp->nes_numsecflavor = 0;
2713                                 error = 0;
2714                         } else {
2715                                 vput(*vpp);
2716                         }
2717                 } else {
2718                         /* Copy the security flavors. */
2719                         for (i = 0; i < exp->nes_numsecflavor; i++)
2720                                 exp->nes_secflavors[i] = secflavors[i];
2721                 }
2722         }
2723         NFSEXITCODE(error);
2724         return (error);
2725 }
2726
2727 /*
2728  * nfsd_fhtovp() - convert a fh to a vnode ptr
2729  *      - look up fsid in mount list (if not found ret error)
2730  *      - get vp and export rights by calling nfsvno_fhtovp()
2731  *      - if cred->cr_uid == 0 or MNT_EXPORTANON set it to credanon
2732  *        for AUTH_SYS
2733  *      - if mpp != NULL, return the mount point so that it can
2734  *        be used for vn_finished_write() by the caller
2735  */
2736 void
2737 nfsd_fhtovp(struct nfsrv_descript *nd, struct nfsrvfh *nfp, int lktype,
2738     struct vnode **vpp, struct nfsexstuff *exp,
2739     struct mount **mpp, int startwrite, struct thread *p)
2740 {
2741         struct mount *mp;
2742         struct ucred *credanon;
2743         fhandle_t *fhp;
2744
2745         fhp = (fhandle_t *)nfp->nfsrvfh_data;
2746         /*
2747          * Check for the special case of the nfsv4root_fh.
2748          */
2749         mp = vfs_busyfs(&fhp->fh_fsid);
2750         if (mpp != NULL)
2751                 *mpp = mp;
2752         if (mp == NULL) {
2753                 *vpp = NULL;
2754                 nd->nd_repstat = ESTALE;
2755                 goto out;
2756         }
2757
2758         if (startwrite) {
2759                 vn_start_write(NULL, mpp, V_WAIT);
2760                 if (lktype == LK_SHARED && !(MNT_SHARED_WRITES(mp)))
2761                         lktype = LK_EXCLUSIVE;
2762         }
2763         nd->nd_repstat = nfsvno_fhtovp(mp, fhp, nd->nd_nam, lktype, vpp, exp,
2764             &credanon);
2765         vfs_unbusy(mp);
2766
2767         /*
2768          * For NFSv4 without a pseudo root fs, unexported file handles
2769          * can be returned, so that Lookup works everywhere.
2770          */
2771         if (!nd->nd_repstat && exp->nes_exflag == 0 &&
2772             !(nd->nd_flag & ND_NFSV4)) {
2773                 vput(*vpp);
2774                 nd->nd_repstat = EACCES;
2775         }
2776
2777         /*
2778          * Personally, I've never seen any point in requiring a
2779          * reserved port#, since only in the rare case where the
2780          * clients are all boxes with secure system priviledges,
2781          * does it provide any enhanced security, but... some people
2782          * believe it to be useful and keep putting this code back in.
2783          * (There is also some "security checker" out there that
2784          *  complains if the nfs server doesn't enforce this.)
2785          * However, note the following:
2786          * RFC3530 (NFSv4) specifies that a reserved port# not be
2787          *      required.
2788          * RFC2623 recommends that, if a reserved port# is checked for,
2789          *      that there be a way to turn that off--> ifdef'd.
2790          */
2791 #ifdef NFS_REQRSVPORT
2792         if (!nd->nd_repstat) {
2793                 struct sockaddr_in *saddr;
2794                 struct sockaddr_in6 *saddr6;
2795
2796                 saddr = NFSSOCKADDR(nd->nd_nam, struct sockaddr_in *);
2797                 saddr6 = NFSSOCKADDR(nd->nd_nam, struct sockaddr_in6 *);
2798                 if (!(nd->nd_flag & ND_NFSV4) &&
2799                     ((saddr->sin_family == AF_INET &&
2800                       ntohs(saddr->sin_port) >= IPPORT_RESERVED) ||
2801                      (saddr6->sin6_family == AF_INET6 &&
2802                       ntohs(saddr6->sin6_port) >= IPPORT_RESERVED))) {
2803                         vput(*vpp);
2804                         nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
2805                 }
2806         }
2807 #endif  /* NFS_REQRSVPORT */
2808
2809         /*
2810          * Check/setup credentials.
2811          */
2812         if (!nd->nd_repstat) {
2813                 nd->nd_saveduid = nd->nd_cred->cr_uid;
2814                 nd->nd_repstat = nfsd_excred(nd, exp, credanon);
2815                 if (nd->nd_repstat)
2816                         vput(*vpp);
2817         }
2818         if (credanon != NULL)
2819                 crfree(credanon);
2820         if (nd->nd_repstat) {
2821                 if (startwrite)
2822                         vn_finished_write(mp);
2823                 *vpp = NULL;
2824                 if (mpp != NULL)
2825                         *mpp = NULL;
2826         }
2827
2828 out:
2829         NFSEXITCODE2(0, nd);
2830 }
2831
2832 /*
2833  * glue for fp.
2834  */
2835 static int
2836 fp_getfvp(struct thread *p, int fd, struct file **fpp, struct vnode **vpp)
2837 {
2838         struct filedesc *fdp;
2839         struct file *fp;
2840         int error = 0;
2841
2842         fdp = p->td_proc->p_fd;
2843         if (fd < 0 || fd >= fdp->fd_nfiles ||
2844             (fp = fdp->fd_ofiles[fd].fde_file) == NULL) {
2845                 error = EBADF;
2846                 goto out;
2847         }
2848         *fpp = fp;
2849
2850 out:
2851         NFSEXITCODE(error);
2852         return (error);
2853 }
2854
2855 /*
2856  * Called from nfssvc() to update the exports list. Just call
2857  * vfs_export(). This has to be done, since the v4 root fake fs isn't
2858  * in the mount list.
2859  */
2860 int
2861 nfsrv_v4rootexport(void *argp, struct ucred *cred, struct thread *p)
2862 {
2863         struct nfsex_args *nfsexargp = (struct nfsex_args *)argp;
2864         int error = 0;
2865         struct nameidata nd;
2866         fhandle_t fh;
2867
2868         error = vfs_export(&nfsv4root_mnt, &nfsexargp->export);
2869         if ((nfsexargp->export.ex_flags & MNT_DELEXPORT) != 0)
2870                 nfs_rootfhset = 0;
2871         else if (error == 0) {
2872                 if (nfsexargp->fspec == NULL) {
2873                         error = EPERM;
2874                         goto out;
2875                 }
2876                 /*
2877                  * If fspec != NULL, this is the v4root path.
2878                  */
2879                 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE,
2880                     nfsexargp->fspec, p);
2881                 if ((error = namei(&nd)) != 0)
2882                         goto out;
2883                 error = nfsvno_getfh(nd.ni_vp, &fh, p);
2884                 vrele(nd.ni_vp);
2885                 if (!error) {
2886                         nfs_rootfh.nfsrvfh_len = NFSX_MYFH;
2887                         NFSBCOPY((caddr_t)&fh,
2888                             nfs_rootfh.nfsrvfh_data,
2889                             sizeof (fhandle_t));
2890                         nfs_rootfhset = 1;
2891                 }
2892         }
2893
2894 out:
2895         NFSEXITCODE(error);
2896         return (error);
2897 }
2898
2899 /*
2900  * This function needs to test to see if the system is near its limit
2901  * for memory allocation via malloc() or mget() and return True iff
2902  * either of these resources are near their limit.
2903  * XXX (For now, this is just a stub.)
2904  */
2905 int nfsrv_testmalloclimit = 0;
2906 int
2907 nfsrv_mallocmget_limit(void)
2908 {
2909         static int printmesg = 0;
2910         static int testval = 1;
2911
2912         if (nfsrv_testmalloclimit && (testval++ % 1000) == 0) {
2913                 if ((printmesg++ % 100) == 0)
2914                         printf("nfsd: malloc/mget near limit\n");
2915                 return (1);
2916         }
2917         return (0);
2918 }
2919
2920 /*
2921  * BSD specific initialization of a mount point.
2922  */
2923 void
2924 nfsd_mntinit(void)
2925 {
2926         static int inited = 0;
2927
2928         if (inited)
2929                 return;
2930         inited = 1;
2931         nfsv4root_mnt.mnt_flag = (MNT_RDONLY | MNT_EXPORTED);
2932         TAILQ_INIT(&nfsv4root_mnt.mnt_nvnodelist);
2933         TAILQ_INIT(&nfsv4root_mnt.mnt_activevnodelist);
2934         nfsv4root_mnt.mnt_export = NULL;
2935         TAILQ_INIT(&nfsv4root_opt);
2936         TAILQ_INIT(&nfsv4root_newopt);
2937         nfsv4root_mnt.mnt_opt = &nfsv4root_opt;
2938         nfsv4root_mnt.mnt_optnew = &nfsv4root_newopt;
2939         nfsv4root_mnt.mnt_nvnodelistsize = 0;
2940         nfsv4root_mnt.mnt_activevnodelistsize = 0;
2941 }
2942
2943 /*
2944  * Get a vnode for a file handle, without checking exports, etc.
2945  */
2946 struct vnode *
2947 nfsvno_getvp(fhandle_t *fhp)
2948 {
2949         struct mount *mp;
2950         struct vnode *vp;
2951         int error;
2952
2953         mp = vfs_busyfs(&fhp->fh_fsid);
2954         if (mp == NULL)
2955                 return (NULL);
2956         error = VFS_FHTOVP(mp, &fhp->fh_fid, LK_EXCLUSIVE, &vp);
2957         vfs_unbusy(mp);
2958         if (error)
2959                 return (NULL);
2960         return (vp);
2961 }
2962
2963 /*
2964  * Do a local VOP_ADVLOCK().
2965  */
2966 int
2967 nfsvno_advlock(struct vnode *vp, int ftype, u_int64_t first,
2968     u_int64_t end, struct thread *td)
2969 {
2970         int error = 0;
2971         struct flock fl;
2972         u_int64_t tlen;
2973
2974         if (nfsrv_dolocallocks == 0)
2975                 goto out;
2976         ASSERT_VOP_UNLOCKED(vp, "nfsvno_advlock: vp locked");
2977
2978         fl.l_whence = SEEK_SET;
2979         fl.l_type = ftype;
2980         fl.l_start = (off_t)first;
2981         if (end == NFS64BITSSET) {
2982                 fl.l_len = 0;
2983         } else {
2984                 tlen = end - first;
2985                 fl.l_len = (off_t)tlen;
2986         }
2987         /*
2988          * For FreeBSD8, the l_pid and l_sysid must be set to the same
2989          * values for all calls, so that all locks will be held by the
2990          * nfsd server. (The nfsd server handles conflicts between the
2991          * various clients.)
2992          * Since an NFSv4 lockowner is a ClientID plus an array of up to 1024
2993          * bytes, so it can't be put in l_sysid.
2994          */
2995         if (nfsv4_sysid == 0)
2996                 nfsv4_sysid = nlm_acquire_next_sysid();
2997         fl.l_pid = (pid_t)0;
2998         fl.l_sysid = (int)nfsv4_sysid;
2999
3000         if (ftype == F_UNLCK)
3001                 error = VOP_ADVLOCK(vp, (caddr_t)td->td_proc, F_UNLCK, &fl,
3002                     (F_POSIX | F_REMOTE));
3003         else
3004                 error = VOP_ADVLOCK(vp, (caddr_t)td->td_proc, F_SETLK, &fl,
3005                     (F_POSIX | F_REMOTE));
3006
3007 out:
3008         NFSEXITCODE(error);
3009         return (error);
3010 }
3011
3012 /*
3013  * Check the nfsv4 root exports.
3014  */
3015 int
3016 nfsvno_v4rootexport(struct nfsrv_descript *nd)
3017 {
3018         struct ucred *credanon;
3019         int exflags, error = 0, numsecflavor, *secflavors, i;
3020
3021         error = vfs_stdcheckexp(&nfsv4root_mnt, nd->nd_nam, &exflags,
3022             &credanon, &numsecflavor, &secflavors);
3023         if (error) {
3024                 error = NFSERR_PROGUNAVAIL;
3025                 goto out;
3026         }
3027         if (credanon != NULL)
3028                 crfree(credanon);
3029         for (i = 0; i < numsecflavor; i++) {
3030                 if (secflavors[i] == AUTH_SYS)
3031                         nd->nd_flag |= ND_EXAUTHSYS;
3032                 else if (secflavors[i] == RPCSEC_GSS_KRB5)
3033                         nd->nd_flag |= ND_EXGSS;
3034                 else if (secflavors[i] == RPCSEC_GSS_KRB5I)
3035                         nd->nd_flag |= ND_EXGSSINTEGRITY;
3036                 else if (secflavors[i] == RPCSEC_GSS_KRB5P)
3037                         nd->nd_flag |= ND_EXGSSPRIVACY;
3038         }
3039
3040 out:
3041         NFSEXITCODE(error);
3042         return (error);
3043 }
3044
3045 /*
3046  * Nfs server psuedo system call for the nfsd's
3047  */
3048 /*
3049  * MPSAFE
3050  */
3051 static int
3052 nfssvc_nfsd(struct thread *td, struct nfssvc_args *uap)
3053 {
3054         struct file *fp;
3055         struct nfsd_addsock_args sockarg;
3056         struct nfsd_nfsd_args nfsdarg;
3057         cap_rights_t rights;
3058         int error;
3059
3060         if (uap->flag & NFSSVC_NFSDADDSOCK) {
3061                 error = copyin(uap->argp, (caddr_t)&sockarg, sizeof (sockarg));
3062                 if (error)
3063                         goto out;
3064                 /*
3065                  * Since we don't know what rights might be required,
3066                  * pretend that we need them all. It is better to be too
3067                  * careful than too reckless.
3068                  */
3069                 error = fget(td, sockarg.sock,
3070                     cap_rights_init(&rights, CAP_SOCK_SERVER), &fp);
3071                 if (error != 0)
3072                         goto out;
3073                 if (fp->f_type != DTYPE_SOCKET) {
3074                         fdrop(fp, td);
3075                         error = EPERM;
3076                         goto out;
3077                 }
3078                 error = nfsrvd_addsock(fp);
3079                 fdrop(fp, td);
3080         } else if (uap->flag & NFSSVC_NFSDNFSD) {
3081                 if (uap->argp == NULL) {
3082                         error = EINVAL;
3083                         goto out;
3084                 }
3085                 error = copyin(uap->argp, (caddr_t)&nfsdarg,
3086                     sizeof (nfsdarg));
3087                 if (error)
3088                         goto out;
3089                 error = nfsrvd_nfsd(td, &nfsdarg);
3090         } else {
3091                 error = nfssvc_srvcall(td, uap, td->td_ucred);
3092         }
3093
3094 out:
3095         NFSEXITCODE(error);
3096         return (error);
3097 }
3098
3099 static int
3100 nfssvc_srvcall(struct thread *p, struct nfssvc_args *uap, struct ucred *cred)
3101 {
3102         struct nfsex_args export;
3103         struct file *fp = NULL;
3104         int stablefd, len;
3105         struct nfsd_clid adminrevoke;
3106         struct nfsd_dumplist dumplist;
3107         struct nfsd_dumpclients *dumpclients;
3108         struct nfsd_dumplocklist dumplocklist;
3109         struct nfsd_dumplocks *dumplocks;
3110         struct nameidata nd;
3111         vnode_t vp;
3112         int error = EINVAL, igotlock;
3113         struct proc *procp;
3114         static int suspend_nfsd = 0;
3115
3116         if (uap->flag & NFSSVC_PUBLICFH) {
3117                 NFSBZERO((caddr_t)&nfs_pubfh.nfsrvfh_data,
3118                     sizeof (fhandle_t));
3119                 error = copyin(uap->argp,
3120                     &nfs_pubfh.nfsrvfh_data, sizeof (fhandle_t));
3121                 if (!error)
3122                         nfs_pubfhset = 1;
3123         } else if (uap->flag & NFSSVC_V4ROOTEXPORT) {
3124                 error = copyin(uap->argp,(caddr_t)&export,
3125                     sizeof (struct nfsex_args));
3126                 if (!error)
3127                         error = nfsrv_v4rootexport(&export, cred, p);
3128         } else if (uap->flag & NFSSVC_NOPUBLICFH) {
3129                 nfs_pubfhset = 0;
3130                 error = 0;
3131         } else if (uap->flag & NFSSVC_STABLERESTART) {
3132                 error = copyin(uap->argp, (caddr_t)&stablefd,
3133                     sizeof (int));
3134                 if (!error)
3135                         error = fp_getfvp(p, stablefd, &fp, &vp);
3136                 if (!error && (NFSFPFLAG(fp) & (FREAD | FWRITE)) != (FREAD | FWRITE))
3137                         error = EBADF;
3138                 if (!error && newnfs_numnfsd != 0)
3139                         error = EPERM;
3140                 if (!error) {
3141                         nfsrv_stablefirst.nsf_fp = fp;
3142                         nfsrv_setupstable(p);
3143                 }
3144         } else if (uap->flag & NFSSVC_ADMINREVOKE) {
3145                 error = copyin(uap->argp, (caddr_t)&adminrevoke,
3146                     sizeof (struct nfsd_clid));
3147                 if (!error)
3148                         error = nfsrv_adminrevoke(&adminrevoke, p);
3149         } else if (uap->flag & NFSSVC_DUMPCLIENTS) {
3150                 error = copyin(uap->argp, (caddr_t)&dumplist,
3151                     sizeof (struct nfsd_dumplist));
3152                 if (!error && (dumplist.ndl_size < 1 ||
3153                         dumplist.ndl_size > NFSRV_MAXDUMPLIST))
3154                         error = EPERM;
3155                 if (!error) {
3156                     len = sizeof (struct nfsd_dumpclients) * dumplist.ndl_size;
3157                     dumpclients = (struct nfsd_dumpclients *)malloc(len,
3158                         M_TEMP, M_WAITOK);
3159                     nfsrv_dumpclients(dumpclients, dumplist.ndl_size);
3160                     error = copyout(dumpclients,
3161                         CAST_USER_ADDR_T(dumplist.ndl_list), len);
3162                     free((caddr_t)dumpclients, M_TEMP);
3163                 }
3164         } else if (uap->flag & NFSSVC_DUMPLOCKS) {
3165                 error = copyin(uap->argp, (caddr_t)&dumplocklist,
3166                     sizeof (struct nfsd_dumplocklist));
3167                 if (!error && (dumplocklist.ndllck_size < 1 ||
3168                         dumplocklist.ndllck_size > NFSRV_MAXDUMPLIST))
3169                         error = EPERM;
3170                 if (!error)
3171                         error = nfsrv_lookupfilename(&nd,
3172                                 dumplocklist.ndllck_fname, p);
3173                 if (!error) {
3174                         len = sizeof (struct nfsd_dumplocks) *
3175                                 dumplocklist.ndllck_size;
3176                         dumplocks = (struct nfsd_dumplocks *)malloc(len,
3177                                 M_TEMP, M_WAITOK);
3178                         nfsrv_dumplocks(nd.ni_vp, dumplocks,
3179                             dumplocklist.ndllck_size, p);
3180                         vput(nd.ni_vp);
3181                         error = copyout(dumplocks,
3182                             CAST_USER_ADDR_T(dumplocklist.ndllck_list), len);
3183                         free((caddr_t)dumplocks, M_TEMP);
3184                 }
3185         } else if (uap->flag & NFSSVC_BACKUPSTABLE) {
3186                 procp = p->td_proc;
3187                 PROC_LOCK(procp);
3188                 nfsd_master_pid = procp->p_pid;
3189                 bcopy(procp->p_comm, nfsd_master_comm, MAXCOMLEN + 1);
3190                 nfsd_master_start = procp->p_stats->p_start;
3191                 nfsd_master_proc = procp;
3192                 PROC_UNLOCK(procp);
3193         } else if ((uap->flag & NFSSVC_SUSPENDNFSD) != 0) {
3194                 NFSLOCKV4ROOTMUTEX();
3195                 if (suspend_nfsd == 0) {
3196                         /* Lock out all nfsd threads */
3197                         do {
3198                                 igotlock = nfsv4_lock(&nfsd_suspend_lock, 1,
3199                                     NULL, NFSV4ROOTLOCKMUTEXPTR, NULL);
3200                         } while (igotlock == 0 && suspend_nfsd == 0);
3201                         suspend_nfsd = 1;
3202                 }
3203                 NFSUNLOCKV4ROOTMUTEX();
3204                 error = 0;
3205         } else if ((uap->flag & NFSSVC_RESUMENFSD) != 0) {
3206                 NFSLOCKV4ROOTMUTEX();
3207                 if (suspend_nfsd != 0) {
3208                         nfsv4_unlock(&nfsd_suspend_lock, 0);
3209                         suspend_nfsd = 0;
3210                 }
3211                 NFSUNLOCKV4ROOTMUTEX();
3212                 error = 0;
3213         }
3214
3215         NFSEXITCODE(error);
3216         return (error);
3217 }
3218
3219 /*
3220  * Check exports.
3221  * Returns 0 if ok, 1 otherwise.
3222  */
3223 int
3224 nfsvno_testexp(struct nfsrv_descript *nd, struct nfsexstuff *exp)
3225 {
3226         int i;
3227
3228         /*
3229          * This seems odd, but allow the case where the security flavor
3230          * list is empty. This happens when NFSv4 is traversing non-exported
3231          * file systems. Exported file systems should always have a non-empty
3232          * security flavor list.
3233          */
3234         if (exp->nes_numsecflavor == 0)
3235                 return (0);
3236
3237         for (i = 0; i < exp->nes_numsecflavor; i++) {
3238                 /*
3239                  * The tests for privacy and integrity must be first,
3240                  * since ND_GSS is set for everything but AUTH_SYS.
3241                  */
3242                 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5P &&
3243                     (nd->nd_flag & ND_GSSPRIVACY))
3244                         return (0);
3245                 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5I &&
3246                     (nd->nd_flag & ND_GSSINTEGRITY))
3247                         return (0);
3248                 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5 &&
3249                     (nd->nd_flag & ND_GSS))
3250                         return (0);
3251                 if (exp->nes_secflavors[i] == AUTH_SYS &&
3252                     (nd->nd_flag & ND_GSS) == 0)
3253                         return (0);
3254         }
3255         return (1);
3256 }
3257
3258 /*
3259  * Calculate a hash value for the fid in a file handle.
3260  */
3261 uint32_t
3262 nfsrv_hashfh(fhandle_t *fhp)
3263 {
3264         uint32_t hashval;
3265
3266         hashval = hash32_buf(&fhp->fh_fid, sizeof(struct fid), 0);
3267         return (hashval);
3268 }
3269
3270 /*
3271  * Calculate a hash value for the sessionid.
3272  */
3273 uint32_t
3274 nfsrv_hashsessionid(uint8_t *sessionid)
3275 {
3276         uint32_t hashval;
3277
3278         hashval = hash32_buf(sessionid, NFSX_V4SESSIONID, 0);
3279         return (hashval);
3280 }
3281
3282 /*
3283  * Signal the userland master nfsd to backup the stable restart file.
3284  */
3285 void
3286 nfsrv_backupstable(void)
3287 {
3288         struct proc *procp;
3289
3290         if (nfsd_master_proc != NULL) {
3291                 procp = pfind(nfsd_master_pid);
3292                 /* Try to make sure it is the correct process. */
3293                 if (procp == nfsd_master_proc &&
3294                     procp->p_stats->p_start.tv_sec ==
3295                     nfsd_master_start.tv_sec &&
3296                     procp->p_stats->p_start.tv_usec ==
3297                     nfsd_master_start.tv_usec &&
3298                     strcmp(procp->p_comm, nfsd_master_comm) == 0)
3299                         kern_psignal(procp, SIGUSR2);
3300                 else
3301                         nfsd_master_proc = NULL;
3302
3303                 if (procp != NULL)
3304                         PROC_UNLOCK(procp);
3305         }
3306 }
3307
3308 extern int (*nfsd_call_nfsd)(struct thread *, struct nfssvc_args *);
3309
3310 /*
3311  * Called once to initialize data structures...
3312  */
3313 static int
3314 nfsd_modevent(module_t mod, int type, void *data)
3315 {
3316         int error = 0, i;
3317         static int loaded = 0;
3318
3319         switch (type) {
3320         case MOD_LOAD:
3321                 if (loaded)
3322                         goto out;
3323                 newnfs_portinit();
3324                 for (i = 0; i < NFSRVCACHE_HASHSIZE; i++) {
3325                         mtx_init(&nfsrchash_table[i].mtx, "nfsrtc", NULL,
3326                             MTX_DEF);
3327                         mtx_init(&nfsrcahash_table[i].mtx, "nfsrtca", NULL,
3328                             MTX_DEF);
3329                 }
3330                 mtx_init(&nfsrc_udpmtx, "nfsuc", NULL, MTX_DEF);
3331                 mtx_init(&nfs_v4root_mutex, "nfs4rt", NULL, MTX_DEF);
3332                 mtx_init(&nfsv4root_mnt.mnt_mtx, "nfs4mnt", NULL, MTX_DEF);
3333                 for (i = 0; i < NFSSESSIONHASHSIZE; i++)
3334                         mtx_init(&nfssessionhash[i].mtx, "nfssm",
3335                             NULL, MTX_DEF);
3336                 lockinit(&nfsv4root_mnt.mnt_explock, PVFS, "explock", 0, 0);
3337                 nfsrvd_initcache();
3338                 nfsd_init();
3339                 NFSD_LOCK();
3340                 nfsrvd_init(0);
3341                 NFSD_UNLOCK();
3342                 nfsd_mntinit();
3343 #ifdef VV_DISABLEDELEG
3344                 vn_deleg_ops.vndeleg_recall = nfsd_recalldelegation;
3345                 vn_deleg_ops.vndeleg_disable = nfsd_disabledelegation;
3346 #endif
3347                 nfsd_call_servertimer = nfsrv_servertimer;
3348                 nfsd_call_nfsd = nfssvc_nfsd;
3349                 loaded = 1;
3350                 break;
3351
3352         case MOD_UNLOAD:
3353                 if (newnfs_numnfsd != 0) {
3354                         error = EBUSY;
3355                         break;
3356                 }
3357
3358 #ifdef VV_DISABLEDELEG
3359                 vn_deleg_ops.vndeleg_recall = NULL;
3360                 vn_deleg_ops.vndeleg_disable = NULL;
3361 #endif
3362                 nfsd_call_servertimer = NULL;
3363                 nfsd_call_nfsd = NULL;
3364
3365                 /* Clean out all NFSv4 state. */
3366                 nfsrv_throwawayallstate(curthread);
3367
3368                 /* Clean the NFS server reply cache */
3369                 nfsrvd_cleancache();
3370
3371                 /* Free up the krpc server pool. */
3372                 if (nfsrvd_pool != NULL)
3373                         svcpool_destroy(nfsrvd_pool);
3374
3375                 /* and get rid of the locks */
3376                 for (i = 0; i < NFSRVCACHE_HASHSIZE; i++) {
3377                         mtx_destroy(&nfsrchash_table[i].mtx);
3378                         mtx_destroy(&nfsrcahash_table[i].mtx);
3379                 }
3380                 mtx_destroy(&nfsrc_udpmtx);
3381                 mtx_destroy(&nfs_v4root_mutex);
3382                 mtx_destroy(&nfsv4root_mnt.mnt_mtx);
3383                 for (i = 0; i < NFSSESSIONHASHSIZE; i++)
3384                         mtx_destroy(&nfssessionhash[i].mtx);
3385                 lockdestroy(&nfsv4root_mnt.mnt_explock);
3386                 loaded = 0;
3387                 break;
3388         default:
3389                 error = EOPNOTSUPP;
3390                 break;
3391         }
3392
3393 out:
3394         NFSEXITCODE(error);
3395         return (error);
3396 }
3397 static moduledata_t nfsd_mod = {
3398         "nfsd",
3399         nfsd_modevent,
3400         NULL,
3401 };
3402 DECLARE_MODULE(nfsd, nfsd_mod, SI_SUB_VFS, SI_ORDER_ANY);
3403
3404 /* So that loader and kldload(2) can find us, wherever we are.. */
3405 MODULE_VERSION(nfsd, 1);
3406 MODULE_DEPEND(nfsd, nfscommon, 1, 1, 1);
3407 MODULE_DEPEND(nfsd, nfslock, 1, 1, 1);
3408 MODULE_DEPEND(nfsd, nfslockd, 1, 1, 1);
3409 MODULE_DEPEND(nfsd, krpc, 1, 1, 1);
3410 MODULE_DEPEND(nfsd, nfssvc, 1, 1, 1);
3411