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