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