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 struct vfsoptlist nfsv4root_opt, nfsv4root_newopt;
  61 NFSDLOCKMUTEX;
  62 struct mtx nfs_cache_mutex;
  63 struct mtx nfs_v4root_mutex;
  64 struct nfsrvfh nfs_rootfh, nfs_pubfh;
  65 int nfs_pubfhset = 0, nfs_rootfhset = 0;
  66 struct proc *nfsd_master_proc = NULL;
  67 static pid_t nfsd_master_pid = (pid_t)-1;
  68 static char nfsd_master_comm[MAXCOMLEN + 1];
  69 static struct timeval nfsd_master_start;
  70 static uint32_t nfsv4_sysid = 0;
  71
  72 static int nfssvc_srvcall(struct thread *, struct nfssvc_args *,
  73     struct ucred *);
  74
  75 int nfsrv_enable_crossmntpt = 1;
  76 static int nfs_commit_blks;
  77 static int nfs_commit_miss;
  78 extern int nfsrv_issuedelegs;
  79 extern int nfsrv_dolocallocks;
  80
  81 SYSCTL_NODE(_vfs, OID_AUTO, nfsd, CTLFLAG_RW, 0, "New NFS server");
  82 SYSCTL_INT(_vfs_nfsd, OID_AUTO, mirrormnt, CTLFLAG_RW,
  83     &nfsrv_enable_crossmntpt, 0, "Enable nfsd to cross mount points");
  84 SYSCTL_INT(_vfs_nfsd, OID_AUTO, commit_blks, CTLFLAG_RW, &nfs_commit_blks,
  85     0, "");
  86 SYSCTL_INT(_vfs_nfsd, OID_AUTO, commit_miss, CTLFLAG_RW, &nfs_commit_miss,
  87     0, "");
  88 SYSCTL_INT(_vfs_nfsd, OID_AUTO, issue_delegations, CTLFLAG_RW,
  89     &nfsrv_issuedelegs, 0, "Enable nfsd to issue delegations");
  90 SYSCTL_INT(_vfs_nfsd, OID_AUTO, enable_locallocks, CTLFLAG_RW,
  91     &nfsrv_dolocallocks, 0, "Enable nfsd to acquire local locks on files");
  92
  93 #define MAX_REORDERED_RPC       16
  94 #define NUM_HEURISTIC           1031
  95 #define NHUSE_INIT              64
  96 #define NHUSE_INC               16
  97 #define NHUSE_MAX               2048
  98
  99 static struct nfsheur {
 100         struct vnode *nh_vp;    /* vp to match (unreferenced pointer) */
 101         off_t nh_nextoff;       /* next offset for sequential detection */
 102         int nh_use;             /* use count for selection */
 103         int nh_seqcount;        /* heuristic */
 104 } nfsheur[NUM_HEURISTIC];
 105
 106
 107 /*
 108  * Heuristic to detect sequential operation.
 109  */
 110 static struct nfsheur *
 111 nfsrv_sequential_heuristic(struct uio *uio, struct vnode *vp)
 112 {
 113         struct nfsheur *nh;
 114         int hi, try;
 115
 116         /* Locate best candidate. */
 117         try = 32;
 118         hi = ((int)(vm_offset_t)vp / sizeof(struct vnode)) % NUM_HEURISTIC;
 119         nh = &nfsheur[hi];
 120         while (try--) {
 121                 if (nfsheur[hi].nh_vp == vp) {
 122                         nh = &nfsheur[hi];
 123                         break;
 124                 }
 125                 if (nfsheur[hi].nh_use > 0)
 126                         --nfsheur[hi].nh_use;
 127                 hi = (hi + 1) % NUM_HEURISTIC;
 128                 if (nfsheur[hi].nh_use < nh->nh_use)
 129                         nh = &nfsheur[hi];
 130         }
 131
 132         /* Initialize hint if this is a new file. */
 133         if (nh->nh_vp != vp) {
 134                 nh->nh_vp = vp;
 135                 nh->nh_nextoff = uio->uio_offset;
 136                 nh->nh_use = NHUSE_INIT;
 137                 if (uio->uio_offset == 0)
 138                         nh->nh_seqcount = 4;
 139                 else
 140                         nh->nh_seqcount = 1;
 141         }
 142
 143         /* Calculate heuristic. */
 144         if ((uio->uio_offset == 0 && nh->nh_seqcount > 0) ||
 145             uio->uio_offset == nh->nh_nextoff) {
 146                 /* See comments in vfs_vnops.c:sequential_heuristic(). */
 147                 nh->nh_seqcount += howmany(uio->uio_resid, 16384);
 148                 if (nh->nh_seqcount > IO_SEQMAX)
 149                         nh->nh_seqcount = IO_SEQMAX;
 150         } else if (qabs(uio->uio_offset - nh->nh_nextoff) <= MAX_REORDERED_RPC *
 151             imax(vp->v_mount->mnt_stat.f_iosize, uio->uio_resid)) {
 152                 /* Probably a reordered RPC, leave seqcount alone. */
 153         } else if (nh->nh_seqcount > 1) {
 154                 nh->nh_seqcount /= 2;
 155         } else {
 156                 nh->nh_seqcount = 0;
 157         }
 158         nh->nh_use += NHUSE_INC;
 159         if (nh->nh_use > NHUSE_MAX)
 160                 nh->nh_use = NHUSE_MAX;
 161         return (nh);
 162 }
 163
 164 /*
 165  * Get attributes into nfsvattr structure.
 166  */
 167 int
 168 nfsvno_getattr(struct vnode *vp, struct nfsvattr *nvap, struct ucred *cred,
 169     struct thread *p, int vpislocked)
 170 {
 171         int error, lockedit = 0;
 172
 173         if (vpislocked == 0) {
 174                 /*
 175                  * When vpislocked == 0, the vnode is either exclusively
 176                  * locked by this thread or not locked by this thread.
 177                  * As such, shared lock it, if not exclusively locked.
 178                  */
 179                 if (NFSVOPISLOCKED(vp) != LK_EXCLUSIVE) {
 180                         lockedit = 1;
 181                         NFSVOPLOCK(vp, LK_SHARED | LK_RETRY);
 182                 }
 183         }
 184         error = VOP_GETATTR(vp, &nvap->na_vattr, cred);
 185         if (lockedit != 0)
 186                 NFSVOPUNLOCK(vp, 0);
 187
 188         NFSEXITCODE(error);
 189         return (error);
 190 }
 191
 192 /*
 193  * Get a file handle for a vnode.
 194  */
 195 int
 196 nfsvno_getfh(struct vnode *vp, fhandle_t *fhp, struct thread *p)
 197 {
 198         int error;
 199
 200         NFSBZERO((caddr_t)fhp, sizeof(fhandle_t));
 201         fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid;
 202         error = VOP_VPTOFH(vp, &fhp->fh_fid);
 203
 204         NFSEXITCODE(error);
 205         return (error);
 206 }
 207
 208 /*
 209  * Perform access checking for vnodes obtained from file handles that would
 210  * refer to files already opened by a Unix client. You cannot just use
 211  * vn_writechk() and VOP_ACCESSX() for two reasons.
 212  * 1 - You must check for exported rdonly as well as MNT_RDONLY for the write
 213  *     case.
 214  * 2 - The owner is to be given access irrespective of mode bits for some
 215  *     operations, so that processes that chmod after opening a file don't
 216  *     break.
 217  */
 218 int
 219 nfsvno_accchk(struct vnode *vp, accmode_t accmode, struct ucred *cred,
 220     struct nfsexstuff *exp, struct thread *p, int override, int vpislocked,
 221     u_int32_t *supportedtypep)
 222 {
 223         struct vattr vattr;
 224         int error = 0, getret = 0;
 225
 226         if (vpislocked == 0) {
 227                 if (NFSVOPLOCK(vp, LK_SHARED) != 0) {
 228                         error = EPERM;
 229                         goto out;
 230                 }
 231         }
 232         if (accmode & VWRITE) {
 233                 /* Just vn_writechk() changed to check rdonly */
 234                 /*
 235                  * Disallow write attempts on read-only file systems;
 236                  * unless the file is a socket or a block or character
 237                  * device resident on the file system.
 238                  */
 239                 if (NFSVNO_EXRDONLY(exp) ||
 240                     (vp->v_mount->mnt_flag & MNT_RDONLY)) {
 241                         switch (vp->v_type) {
 242                         case VREG:
 243                         case VDIR:
 244                         case VLNK:
 245                                 error = EROFS;
 246                         default:
 247                                 break;
 248                         }
 249                 }
 250                 /*
 251                  * If there's shared text associated with
 252                  * the inode, try to free it up once.  If
 253                  * we fail, we can't allow writing.
 254                  */
 255                 if ((vp->v_vflag & VV_TEXT) != 0 && error == 0)
 256                         error = ETXTBSY;
 257         }
 258         if (error != 0) {
 259                 if (vpislocked == 0)
 260                         NFSVOPUNLOCK(vp, 0);
 261                 goto out;
 262         }
 263
 264         /*
 265          * Should the override still be applied when ACLs are enabled?
 266          */
 267         error = VOP_ACCESSX(vp, accmode, cred, p);
 268         if (error != 0 && (accmode & (VDELETE | VDELETE_CHILD))) {
 269                 /*
 270                  * Try again with VEXPLICIT_DENY, to see if the test for
 271                  * deletion is supported.
 272                  */
 273                 error = VOP_ACCESSX(vp, accmode | VEXPLICIT_DENY, cred, p);
 274                 if (error == 0) {
 275                         if (vp->v_type == VDIR) {
 276                                 accmode &= ~(VDELETE | VDELETE_CHILD);
 277                                 accmode |= VWRITE;
 278                                 error = VOP_ACCESSX(vp, accmode, cred, p);
 279                         } else if (supportedtypep != NULL) {
 280                                 *supportedtypep &= ~NFSACCESS_DELETE;
 281                         }
 282                 }
 283         }
 284
 285         /*
 286          * Allow certain operations for the owner (reads and writes
 287          * on files that are already open).
 288          */
 289         if (override != NFSACCCHK_NOOVERRIDE &&
 290             (error == EPERM || error == EACCES)) {
 291                 if (cred->cr_uid == 0 && (override & NFSACCCHK_ALLOWROOT))
 292                         error = 0;
 293                 else if (override & NFSACCCHK_ALLOWOWNER) {
 294                         getret = VOP_GETATTR(vp, &vattr, cred);
 295                         if (getret == 0 && cred->cr_uid == vattr.va_uid)
 296                                 error = 0;
 297                 }
 298         }
 299         if (vpislocked == 0)
 300                 NFSVOPUNLOCK(vp, 0);
 301
 302 out:
 303         NFSEXITCODE(error);
 304         return (error);
 305 }
 306
 307 /*
 308  * Set attribute(s) vnop.
 309  */
 310 int
 311 nfsvno_setattr(struct vnode *vp, struct nfsvattr *nvap, struct ucred *cred,
 312     struct thread *p, struct nfsexstuff *exp)
 313 {
 314         int error;
 315
 316         error = VOP_SETATTR(vp, &nvap->na_vattr, cred);
 317         NFSEXITCODE(error);
 318         return (error);
 319 }
 320
 321 /*
 322  * Set up nameidata for a lookup() call and do it.
 323  */
 324 int
 325 nfsvno_namei(struct nfsrv_descript *nd, struct nameidata *ndp,
 326     struct vnode *dp, int islocked, struct nfsexstuff *exp, struct thread *p,
 327     struct vnode **retdirp)
 328 {
 329         struct componentname *cnp = &ndp->ni_cnd;
 330         int i;
 331         struct iovec aiov;
 332         struct uio auio;
 333         int lockleaf = (cnp->cn_flags & LOCKLEAF) != 0, linklen;
 334         int error = 0, crossmnt;
 335         char *cp;
 336
 337         *retdirp = NULL;
 338         cnp->cn_nameptr = cnp->cn_pnbuf;
 339         ndp->ni_strictrelative = 0;
 340         /*
 341          * Extract and set starting directory.
 342          */
 343         if (dp->v_type != VDIR) {
 344                 if (islocked)
 345                         vput(dp);
 346                 else
 347                         vrele(dp);
 348                 nfsvno_relpathbuf(ndp);
 349                 error = ENOTDIR;
 350                 goto out1;
 351         }
 352         if (islocked)
 353                 NFSVOPUNLOCK(dp, 0);
 354         VREF(dp);
 355         *retdirp = dp;
 356         if (NFSVNO_EXRDONLY(exp))
 357                 cnp->cn_flags |= RDONLY;
 358         ndp->ni_segflg = UIO_SYSSPACE;
 359         crossmnt = 1;
 360
 361         if (nd->nd_flag & ND_PUBLOOKUP) {
 362                 ndp->ni_loopcnt = 0;
 363                 if (cnp->cn_pnbuf[0] == '/') {
 364                         vrele(dp);
 365                         /*
 366                          * Check for degenerate pathnames here, since lookup()
 367                          * panics on them.
 368                          */
 369                         for (i = 1; i < ndp->ni_pathlen; i++)
 370                                 if (cnp->cn_pnbuf[i] != '/')
 371                                         break;
 372                         if (i == ndp->ni_pathlen) {
 373                                 error = NFSERR_ACCES;
 374                                 goto out;
 375                         }
 376                         dp = rootvnode;
 377                         VREF(dp);
 378                 }
 379         } else if ((nfsrv_enable_crossmntpt == 0 && NFSVNO_EXPORTED(exp)) ||
 380             (nd->nd_flag & ND_NFSV4) == 0) {
 381                 /*
 382                  * Only cross mount points for NFSv4 when doing a
 383                  * mount while traversing the file system above
 384                  * the mount point, unless nfsrv_enable_crossmntpt is set.
 385                  */
 386                 cnp->cn_flags |= NOCROSSMOUNT;
 387                 crossmnt = 0;
 388         }
 389
 390         /*
 391          * Initialize for scan, set ni_startdir and bump ref on dp again
 392          * becuase lookup() will dereference ni_startdir.
 393          */
 394
 395         cnp->cn_thread = p;
 396         ndp->ni_startdir = dp;
 397         ndp->ni_rootdir = rootvnode;
 398         ndp->ni_topdir = NULL;
 399
 400         if (!lockleaf)
 401                 cnp->cn_flags |= LOCKLEAF;
 402         for (;;) {
 403                 cnp->cn_nameptr = cnp->cn_pnbuf;
 404                 /*
 405                  * Call lookup() to do the real work.  If an error occurs,
 406                  * ndp->ni_vp and ni_dvp are left uninitialized or NULL and
 407                  * we do not have to dereference anything before returning.
 408                  * In either case ni_startdir will be dereferenced and NULLed
 409                  * out.
 410                  */
 411                 error = lookup(ndp);
 412                 if (error)
 413                         break;
 414
 415                 /*
 416                  * Check for encountering a symbolic link.  Trivial
 417                  * termination occurs if no symlink encountered.
 418                  */
 419                 if ((cnp->cn_flags & ISSYMLINK) == 0) {
 420                         if ((cnp->cn_flags & (SAVENAME | SAVESTART)) == 0)
 421                                 nfsvno_relpathbuf(ndp);
 422                         if (ndp->ni_vp && !lockleaf)
 423                                 NFSVOPUNLOCK(ndp->ni_vp, 0);
 424                         break;
 425                 }
 426
 427                 /*
 428                  * Validate symlink
 429                  */
 430                 if ((cnp->cn_flags & LOCKPARENT) && ndp->ni_pathlen == 1)
 431                         NFSVOPUNLOCK(ndp->ni_dvp, 0);
 432                 if (!(nd->nd_flag & ND_PUBLOOKUP)) {
 433                         error = EINVAL;
 434                         goto badlink2;
 435                 }
 436
 437                 if (ndp->ni_loopcnt++ >= MAXSYMLINKS) {
 438                         error = ELOOP;
 439                         goto badlink2;
 440                 }
 441                 if (ndp->ni_pathlen > 1)
 442                         cp = uma_zalloc(namei_zone, M_WAITOK);
 443                 else
 444                         cp = cnp->cn_pnbuf;
 445                 aiov.iov_base = cp;
 446                 aiov.iov_len = MAXPATHLEN;
 447                 auio.uio_iov = &aiov;
 448                 auio.uio_iovcnt = 1;
 449                 auio.uio_offset = 0;
 450                 auio.uio_rw = UIO_READ;
 451                 auio.uio_segflg = UIO_SYSSPACE;
 452                 auio.uio_td = NULL;
 453                 auio.uio_resid = MAXPATHLEN;
 454                 error = VOP_READLINK(ndp->ni_vp, &auio, cnp->cn_cred);
 455                 if (error) {
 456                 badlink1:
 457                         if (ndp->ni_pathlen > 1)
 458                                 uma_zfree(namei_zone, cp);
 459                 badlink2:
 460                         vrele(ndp->ni_dvp);
 461                         vput(ndp->ni_vp);
 462                         break;
 463                 }
 464                 linklen = MAXPATHLEN - auio.uio_resid;
 465                 if (linklen == 0) {
 466                         error = ENOENT;
 467                         goto badlink1;
 468                 }
 469                 if (linklen + ndp->ni_pathlen >= MAXPATHLEN) {
 470                         error = ENAMETOOLONG;
 471                         goto badlink1;
 472                 }
 473
 474                 /*
 475                  * Adjust or replace path
 476                  */
 477                 if (ndp->ni_pathlen > 1) {
 478                         NFSBCOPY(ndp->ni_next, cp + linklen, ndp->ni_pathlen);
 479                         uma_zfree(namei_zone, cnp->cn_pnbuf);
 480                         cnp->cn_pnbuf = cp;
 481                 } else
 482                         cnp->cn_pnbuf[linklen] = '\0';
 483                 ndp->ni_pathlen += linklen;
 484
 485                 /*
 486                  * Cleanup refs for next loop and check if root directory
 487                  * should replace current directory.  Normally ni_dvp
 488                  * becomes the new base directory and is cleaned up when
 489                  * we loop.  Explicitly null pointers after invalidation
 490                  * to clarify operation.
 491                  */
 492                 vput(ndp->ni_vp);
 493                 ndp->ni_vp = NULL;
 494
 495                 if (cnp->cn_pnbuf[0] == '/') {
 496                         vrele(ndp->ni_dvp);
 497                         ndp->ni_dvp = ndp->ni_rootdir;
 498                         VREF(ndp->ni_dvp);
 499                 }
 500                 ndp->ni_startdir = ndp->ni_dvp;
 501                 ndp->ni_dvp = NULL;
 502         }
 503         if (!lockleaf)
 504                 cnp->cn_flags &= ~LOCKLEAF;
 505
 506 out:
 507         if (error) {
 508                 uma_zfree(namei_zone, cnp->cn_pnbuf);
 509                 ndp->ni_vp = NULL;
 510                 ndp->ni_dvp = NULL;
 511                 ndp->ni_startdir = NULL;
 512                 cnp->cn_flags &= ~HASBUF;
 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_WAIT);
 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_WAIT);
 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 && vp->v_type != VDIR)
1578                 nd->nd_repstat = NFSERR_NOTDIR;
1579         if (nd->nd_repstat == 0 && cnt == 0) {
1580                 if (nd->nd_flag & ND_NFSV2)
1581                         /* NFSv2 does not have NFSERR_TOOSMALL */
1582                         nd->nd_repstat = EPERM;
1583                 else
1584                         nd->nd_repstat = NFSERR_TOOSMALL;
1585         }
1586         if (!nd->nd_repstat)
1587                 nd->nd_repstat = nfsvno_accchk(vp, VEXEC,
1588                     nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
1589                     NFSACCCHK_VPISLOCKED, NULL);
1590         if (nd->nd_repstat) {
1591                 vput(vp);
1592                 if (nd->nd_flag & ND_NFSV3)
1593                         nfsrv_postopattr(nd, getret, &at);
1594                 goto out;
1595         }
1596         not_zfs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "zfs");
1597         MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
1598 again:
1599         eofflag = 0;
1600         if (cookies) {
1601                 free((caddr_t)cookies, M_TEMP);
1602                 cookies = NULL;
1603         }
1604
1605         iv.iov_base = rbuf;
1606         iv.iov_len = siz;
1607         io.uio_iov = &iv;
1608         io.uio_iovcnt = 1;
1609         io.uio_offset = (off_t)off;
1610         io.uio_resid = siz;
1611         io.uio_segflg = UIO_SYSSPACE;
1612         io.uio_rw = UIO_READ;
1613         io.uio_td = NULL;
1614         nd->nd_repstat = VOP_READDIR(vp, &io, nd->nd_cred, &eofflag, &ncookies,
1615             &cookies);
1616         off = (u_int64_t)io.uio_offset;
1617         if (io.uio_resid)
1618                 siz -= io.uio_resid;
1619
1620         if (!cookies && !nd->nd_repstat)
1621                 nd->nd_repstat = NFSERR_PERM;
1622         if (nd->nd_flag & ND_NFSV3) {
1623                 getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
1624                 if (!nd->nd_repstat)
1625                         nd->nd_repstat = getret;
1626         }
1627
1628         /*
1629          * Handles the failed cases. nd->nd_repstat == 0 past here.
1630          */
1631         if (nd->nd_repstat) {
1632                 vput(vp);
1633                 free((caddr_t)rbuf, M_TEMP);
1634                 if (cookies)
1635                         free((caddr_t)cookies, M_TEMP);
1636                 if (nd->nd_flag & ND_NFSV3)
1637                         nfsrv_postopattr(nd, getret, &at);
1638                 goto out;
1639         }
1640         /*
1641          * If nothing read, return eof
1642          * rpc reply
1643          */
1644         if (siz == 0) {
1645                 vput(vp);
1646                 if (nd->nd_flag & ND_NFSV2) {
1647                         NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1648                 } else {
1649                         nfsrv_postopattr(nd, getret, &at);
1650                         NFSM_BUILD(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
1651                         txdr_hyper(at.na_filerev, tl);
1652                         tl += 2;
1653                 }
1654                 *tl++ = newnfs_false;
1655                 *tl = newnfs_true;
1656                 FREE((caddr_t)rbuf, M_TEMP);
1657                 FREE((caddr_t)cookies, M_TEMP);
1658                 goto out;
1659         }
1660
1661         /*
1662          * Check for degenerate cases of nothing useful read.
1663          * If so go try again
1664          */
1665         cpos = rbuf;
1666         cend = rbuf + siz;
1667         dp = (struct dirent *)cpos;
1668         cookiep = cookies;
1669
1670         /*
1671          * For some reason FreeBSD's ufs_readdir() chooses to back the
1672          * directory offset up to a block boundary, so it is necessary to
1673          * skip over the records that precede the requested offset. This
1674          * requires the assumption that file offset cookies monotonically
1675          * increase.
1676          * Since the offset cookies don't monotonically increase for ZFS,
1677          * this is not done when ZFS is the file system.
1678          */
1679         while (cpos < cend && ncookies > 0 &&
1680             (dp->d_fileno == 0 || dp->d_type == DT_WHT ||
1681              (not_zfs != 0 && ((u_quad_t)(*cookiep)) <= toff))) {
1682                 cpos += dp->d_reclen;
1683                 dp = (struct dirent *)cpos;
1684                 cookiep++;
1685                 ncookies--;
1686         }
1687         if (cpos >= cend || ncookies == 0) {
1688                 siz = fullsiz;
1689                 toff = off;
1690                 goto again;
1691         }
1692         vput(vp);
1693
1694         /*
1695          * dirlen is the size of the reply, including all XDR and must
1696          * not exceed cnt. For NFSv2, RFC1094 didn't clearly indicate
1697          * if the XDR should be included in "count", but to be safe, we do.
1698          * (Include the two booleans at the end of the reply in dirlen now.)
1699          */
1700         if (nd->nd_flag & ND_NFSV3) {
1701                 nfsrv_postopattr(nd, getret, &at);
1702                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1703                 txdr_hyper(at.na_filerev, tl);
1704                 dirlen = NFSX_V3POSTOPATTR + NFSX_VERF + 2 * NFSX_UNSIGNED;
1705         } else {
1706                 dirlen = 2 * NFSX_UNSIGNED;
1707         }
1708
1709         /* Loop through the records and build reply */
1710         while (cpos < cend && ncookies > 0) {
1711                 nlen = dp->d_namlen;
1712                 if (dp->d_fileno != 0 && dp->d_type != DT_WHT &&
1713                         nlen <= NFS_MAXNAMLEN) {
1714                         if (nd->nd_flag & ND_NFSV3)
1715                                 dirlen += (6*NFSX_UNSIGNED + NFSM_RNDUP(nlen));
1716                         else
1717                                 dirlen += (4*NFSX_UNSIGNED + NFSM_RNDUP(nlen));
1718                         if (dirlen > cnt) {
1719                                 eofflag = 0;
1720                                 break;
1721                         }
1722
1723                         /*
1724                          * Build the directory record xdr from
1725                          * the dirent entry.
1726                          */
1727                         if (nd->nd_flag & ND_NFSV3) {
1728                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1729                                 *tl++ = newnfs_true;
1730                                 *tl++ = 0;
1731                         } else {
1732                                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1733                                 *tl++ = newnfs_true;
1734                         }
1735                         *tl = txdr_unsigned(dp->d_fileno);
1736                         (void) nfsm_strtom(nd, dp->d_name, nlen);
1737                         if (nd->nd_flag & ND_NFSV3) {
1738                                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1739                                 *tl++ = 0;
1740                         } else
1741                                 NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
1742                         *tl = txdr_unsigned(*cookiep);
1743                 }
1744                 cpos += dp->d_reclen;
1745                 dp = (struct dirent *)cpos;
1746                 cookiep++;
1747                 ncookies--;
1748         }
1749         if (cpos < cend)
1750                 eofflag = 0;
1751         NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1752         *tl++ = newnfs_false;
1753         if (eofflag)
1754                 *tl = newnfs_true;
1755         else
1756                 *tl = newnfs_false;
1757         FREE((caddr_t)rbuf, M_TEMP);
1758         FREE((caddr_t)cookies, M_TEMP);
1759
1760 out:
1761         NFSEXITCODE2(0, nd);
1762         return (0);
1763 nfsmout:
1764         vput(vp);
1765         NFSEXITCODE2(error, nd);
1766         return (error);
1767 }
1768
1769 /*
1770  * Readdirplus for V3 and Readdir for V4.
1771  */
1772 int
1773 nfsrvd_readdirplus(struct nfsrv_descript *nd, int isdgram,
1774     struct vnode *vp, struct thread *p, struct nfsexstuff *exp)
1775 {
1776         struct dirent *dp;
1777         u_int32_t *tl;
1778         int dirlen;
1779         char *cpos, *cend, *rbuf;
1780         struct vnode *nvp;
1781         fhandle_t nfh;
1782         struct nfsvattr nva, at, *nvap = &nva;
1783         struct mbuf *mb0, *mb1;
1784         struct nfsreferral *refp;
1785         int nlen, r, error = 0, getret = 1, usevget = 1;
1786         int siz, cnt, fullsiz, eofflag, ncookies, entrycnt;
1787         caddr_t bpos0, bpos1;
1788         u_int64_t off, toff, verf;
1789         u_long *cookies = NULL, *cookiep;
1790         nfsattrbit_t attrbits, rderrbits, savbits;
1791         struct uio io;
1792         struct iovec iv;
1793         struct componentname cn;
1794         int at_root, needs_unbusy, not_zfs, supports_nfsv4acls;
1795         struct mount *mp, *new_mp;
1796         uint64_t mounted_on_fileno;
1797
1798         if (nd->nd_repstat) {
1799                 nfsrv_postopattr(nd, getret, &at);
1800                 goto out;
1801         }
1802         NFSM_DISSECT(tl, u_int32_t *, 6 * NFSX_UNSIGNED);
1803         off = fxdr_hyper(tl);
1804         toff = off;
1805         tl += 2;
1806         verf = fxdr_hyper(tl);
1807         tl += 2;
1808         siz = fxdr_unsigned(int, *tl++);
1809         cnt = fxdr_unsigned(int, *tl);
1810
1811         /*
1812          * Use the server's maximum data transfer size as the upper bound
1813          * on reply datalen.
1814          */
1815         if (cnt > NFS_SRVMAXDATA(nd) || cnt < 0)
1816                 cnt = NFS_SRVMAXDATA(nd);
1817
1818         /*
1819          * siz is a "hint" of how much directory information (name, fileid,
1820          * cookie) should be in the reply. At least one client "hints" 0,
1821          * so I set it to cnt for that case. I also round it up to the
1822          * next multiple of DIRBLKSIZ.
1823          */
1824         if (siz <= 0)
1825                 siz = cnt;
1826         siz = ((siz + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1));
1827
1828         if (nd->nd_flag & ND_NFSV4) {
1829                 error = nfsrv_getattrbits(nd, &attrbits, NULL, NULL);
1830                 if (error)
1831                         goto nfsmout;
1832                 NFSSET_ATTRBIT(&savbits, &attrbits);
1833                 NFSCLRNOTFILLABLE_ATTRBIT(&attrbits);
1834                 NFSZERO_ATTRBIT(&rderrbits);
1835                 NFSSETBIT_ATTRBIT(&rderrbits, NFSATTRBIT_RDATTRERROR);
1836         } else {
1837                 NFSZERO_ATTRBIT(&attrbits);
1838         }
1839         fullsiz = siz;
1840         nd->nd_repstat = getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
1841         if (!nd->nd_repstat) {
1842             if (off && verf != at.na_filerev) {
1843                 /*
1844                  * va_filerev is not sufficient as a cookie verifier,
1845                  * since it is not supposed to change when entries are
1846                  * removed/added unless that offset cookies returned to
1847                  * the client are no longer valid.
1848                  */
1849 #if 0
1850                 if (nd->nd_flag & ND_NFSV4) {
1851                         nd->nd_repstat = NFSERR_NOTSAME;
1852                 } else {
1853                         nd->nd_repstat = NFSERR_BAD_COOKIE;
1854                 }
1855 #endif
1856             } else if ((nd->nd_flag & ND_NFSV4) && off == 0 && verf != 0) {
1857                 nd->nd_repstat = NFSERR_BAD_COOKIE;
1858             }
1859         }
1860         if (!nd->nd_repstat && vp->v_type != VDIR)
1861                 nd->nd_repstat = NFSERR_NOTDIR;
1862         if (!nd->nd_repstat && cnt == 0)
1863                 nd->nd_repstat = NFSERR_TOOSMALL;
1864         if (!nd->nd_repstat)
1865                 nd->nd_repstat = nfsvno_accchk(vp, VEXEC,
1866                     nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
1867                     NFSACCCHK_VPISLOCKED, NULL);
1868         if (nd->nd_repstat) {
1869                 vput(vp);
1870                 if (nd->nd_flag & ND_NFSV3)
1871                         nfsrv_postopattr(nd, getret, &at);
1872                 goto out;
1873         }
1874         not_zfs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "zfs");
1875
1876         MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
1877 again:
1878         eofflag = 0;
1879         if (cookies) {
1880                 free((caddr_t)cookies, M_TEMP);
1881                 cookies = NULL;
1882         }
1883
1884         iv.iov_base = rbuf;
1885         iv.iov_len = siz;
1886         io.uio_iov = &iv;
1887         io.uio_iovcnt = 1;
1888         io.uio_offset = (off_t)off;
1889         io.uio_resid = siz;
1890         io.uio_segflg = UIO_SYSSPACE;
1891         io.uio_rw = UIO_READ;
1892         io.uio_td = NULL;
1893         nd->nd_repstat = VOP_READDIR(vp, &io, nd->nd_cred, &eofflag, &ncookies,
1894             &cookies);
1895         off = (u_int64_t)io.uio_offset;
1896         if (io.uio_resid)
1897                 siz -= io.uio_resid;
1898
1899         getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
1900
1901         if (!cookies && !nd->nd_repstat)
1902                 nd->nd_repstat = NFSERR_PERM;
1903         if (!nd->nd_repstat)
1904                 nd->nd_repstat = getret;
1905         if (nd->nd_repstat) {
1906                 vput(vp);
1907                 if (cookies)
1908                         free((caddr_t)cookies, M_TEMP);
1909                 free((caddr_t)rbuf, M_TEMP);
1910                 if (nd->nd_flag & ND_NFSV3)
1911                         nfsrv_postopattr(nd, getret, &at);
1912                 goto out;
1913         }
1914         /*
1915          * If nothing read, return eof
1916          * rpc reply
1917          */
1918         if (siz == 0) {
1919                 vput(vp);
1920                 if (nd->nd_flag & ND_NFSV3)
1921                         nfsrv_postopattr(nd, getret, &at);
1922                 NFSM_BUILD(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
1923                 txdr_hyper(at.na_filerev, tl);
1924                 tl += 2;
1925                 *tl++ = newnfs_false;
1926                 *tl = newnfs_true;
1927                 free((caddr_t)cookies, M_TEMP);
1928                 free((caddr_t)rbuf, M_TEMP);
1929                 goto out;
1930         }
1931
1932         /*
1933          * Check for degenerate cases of nothing useful read.
1934          * If so go try again
1935          */
1936         cpos = rbuf;
1937         cend = rbuf + siz;
1938         dp = (struct dirent *)cpos;
1939         cookiep = cookies;
1940
1941         /*
1942          * For some reason FreeBSD's ufs_readdir() chooses to back the
1943          * directory offset up to a block boundary, so it is necessary to
1944          * skip over the records that precede the requested offset. This
1945          * requires the assumption that file offset cookies monotonically
1946          * increase.
1947          * Since the offset cookies don't monotonically increase for ZFS,
1948          * this is not done when ZFS is the file system.
1949          */
1950         while (cpos < cend && ncookies > 0 &&
1951           (dp->d_fileno == 0 || dp->d_type == DT_WHT ||
1952            (not_zfs != 0 && ((u_quad_t)(*cookiep)) <= toff) ||
1953            ((nd->nd_flag & ND_NFSV4) &&
1954             ((dp->d_namlen == 1 && dp->d_name[0] == '.') ||
1955              (dp->d_namlen==2 && dp->d_name[0]=='.' && dp->d_name[1]=='.'))))) {
1956                 cpos += dp->d_reclen;
1957                 dp = (struct dirent *)cpos;
1958                 cookiep++;
1959                 ncookies--;
1960         }
1961         if (cpos >= cend || ncookies == 0) {
1962                 siz = fullsiz;
1963                 toff = off;
1964                 goto again;
1965         }
1966
1967         /*
1968          * Busy the file system so that the mount point won't go away
1969          * and, as such, VFS_VGET() can be used safely.
1970          */
1971         mp = vp->v_mount;
1972         vfs_ref(mp);
1973         NFSVOPUNLOCK(vp, 0);
1974         nd->nd_repstat = vfs_busy(mp, 0);
1975         vfs_rel(mp);
1976         if (nd->nd_repstat != 0) {
1977                 vrele(vp);
1978                 free(cookies, M_TEMP);
1979                 free(rbuf, M_TEMP);
1980                 if (nd->nd_flag & ND_NFSV3)
1981                         nfsrv_postopattr(nd, getret, &at);
1982                 goto out;
1983         }
1984
1985         /*
1986          * Save this position, in case there is an error before one entry
1987          * is created.
1988          */
1989         mb0 = nd->nd_mb;
1990         bpos0 = nd->nd_bpos;
1991
1992         /*
1993          * Fill in the first part of the reply.
1994          * dirlen is the reply length in bytes and cannot exceed cnt.
1995          * (Include the two booleans at the end of the reply in dirlen now,
1996          *  so we recognize when we have exceeded cnt.)
1997          */
1998         if (nd->nd_flag & ND_NFSV3) {
1999                 dirlen = NFSX_V3POSTOPATTR + NFSX_VERF + 2 * NFSX_UNSIGNED;
2000                 nfsrv_postopattr(nd, getret, &at);
2001         } else {
2002                 dirlen = NFSX_VERF + 2 * NFSX_UNSIGNED;
2003         }
2004         NFSM_BUILD(tl, u_int32_t *, NFSX_VERF);
2005         txdr_hyper(at.na_filerev, tl);
2006
2007         /*
2008          * Save this position, in case there is an empty reply needed.
2009          */
2010         mb1 = nd->nd_mb;
2011         bpos1 = nd->nd_bpos;
2012
2013         /* Loop through the records and build reply */
2014         entrycnt = 0;
2015         while (cpos < cend && ncookies > 0 && dirlen < cnt) {
2016                 nlen = dp->d_namlen;
2017                 if (dp->d_fileno != 0 && dp->d_type != DT_WHT &&
2018                     nlen <= NFS_MAXNAMLEN &&
2019                     ((nd->nd_flag & ND_NFSV3) || nlen > 2 ||
2020                      (nlen==2 && (dp->d_name[0]!='.' || dp->d_name[1]!='.'))
2021                       || (nlen == 1 && dp->d_name[0] != '.'))) {
2022                         /*
2023                          * Save the current position in the reply, in case
2024                          * this entry exceeds cnt.
2025                          */
2026                         mb1 = nd->nd_mb;
2027                         bpos1 = nd->nd_bpos;
2028
2029                         /*
2030                          * For readdir_and_lookup get the vnode using
2031                          * the file number.
2032                          */
2033                         nvp = NULL;
2034                         refp = NULL;
2035                         r = 0;
2036                         at_root = 0;
2037                         needs_unbusy = 0;
2038                         new_mp = mp;
2039                         mounted_on_fileno = (uint64_t)dp->d_fileno;
2040                         if ((nd->nd_flag & ND_NFSV3) ||
2041                             NFSNONZERO_ATTRBIT(&savbits)) {
2042                                 if (nd->nd_flag & ND_NFSV4)
2043                                         refp = nfsv4root_getreferral(NULL,
2044                                             vp, dp->d_fileno);
2045                                 if (refp == NULL) {
2046                                         if (usevget)
2047                                                 r = VFS_VGET(mp, dp->d_fileno,
2048                                                     LK_SHARED, &nvp);
2049                                         else
2050                                                 r = EOPNOTSUPP;
2051                                         if (r == EOPNOTSUPP) {
2052                                                 if (usevget) {
2053                                                         usevget = 0;
2054                                                         cn.cn_nameiop = LOOKUP;
2055                                                         cn.cn_lkflags =
2056                                                             LK_SHARED |
2057                                                             LK_RETRY;
2058                                                         cn.cn_cred =
2059                                                             nd->nd_cred;
2060                                                         cn.cn_thread = p;
2061                                                 }
2062                                                 cn.cn_nameptr = dp->d_name;
2063                                                 cn.cn_namelen = nlen;
2064                                                 cn.cn_flags = ISLASTCN |
2065                                                     NOFOLLOW | LOCKLEAF |
2066                                                     MPSAFE;
2067                                                 if (nlen == 2 &&
2068                                                     dp->d_name[0] == '.' &&
2069                                                     dp->d_name[1] == '.')
2070                                                         cn.cn_flags |=
2071                                                             ISDOTDOT;
2072                                                 if (NFSVOPLOCK(vp, LK_SHARED)
2073                                                     != 0) {
2074                                                         nd->nd_repstat = EPERM;
2075                                                         break;
2076                                                 }
2077                                                 if ((vp->v_vflag & VV_ROOT) != 0
2078                                                     && (cn.cn_flags & ISDOTDOT)
2079                                                     != 0) {
2080                                                         vref(vp);
2081                                                         nvp = vp;
2082                                                         r = 0;
2083                                                 } else {
2084                                                         r = VOP_LOOKUP(vp, &nvp,
2085                                                             &cn);
2086                                                         if (vp != nvp)
2087                                                                 NFSVOPUNLOCK(vp,
2088                                                                     0);
2089                                                 }
2090                                         }
2091
2092                                         /*
2093                                          * For NFSv4, check to see if nvp is
2094                                          * a mount point and get the mount
2095                                          * point vnode, as required.
2096                                          */
2097                                         if (r == 0 &&
2098                                             nfsrv_enable_crossmntpt != 0 &&
2099                                             (nd->nd_flag & ND_NFSV4) != 0 &&
2100                                             nvp->v_type == VDIR &&
2101                                             nvp->v_mountedhere != NULL) {
2102                                                 new_mp = nvp->v_mountedhere;
2103                                                 r = vfs_busy(new_mp, 0);
2104                                                 vput(nvp);
2105                                                 nvp = NULL;
2106                                                 if (r == 0) {
2107                                                         r = VFS_ROOT(new_mp,
2108                                                             LK_SHARED, &nvp);
2109                                                         needs_unbusy = 1;
2110                                                         if (r == 0)
2111                                                                 at_root = 1;
2112                                                 }
2113                                         }
2114                                 }
2115                                 if (!r) {
2116                                     if (refp == NULL &&
2117                                         ((nd->nd_flag & ND_NFSV3) ||
2118                                          NFSNONZERO_ATTRBIT(&attrbits))) {
2119                                         r = nfsvno_getfh(nvp, &nfh, p);
2120                                         if (!r)
2121                                             r = nfsvno_getattr(nvp, nvap,
2122                                                 nd->nd_cred, p, 1);
2123                                     }
2124                                 } else {
2125                                     nvp = NULL;
2126                                 }
2127                                 if (r) {
2128                                         if (!NFSISSET_ATTRBIT(&attrbits,
2129                                             NFSATTRBIT_RDATTRERROR)) {
2130                                                 if (nvp != NULL)
2131                                                         vput(nvp);
2132                                                 if (needs_unbusy != 0)
2133                                                         vfs_unbusy(new_mp);
2134                                                 nd->nd_repstat = r;
2135                                                 break;
2136                                         }
2137                                 }
2138                         }
2139
2140                         /*
2141                          * Build the directory record xdr
2142                          */
2143                         if (nd->nd_flag & ND_NFSV3) {
2144                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
2145                                 *tl++ = newnfs_true;
2146                                 *tl++ = 0;
2147                                 *tl = txdr_unsigned(dp->d_fileno);
2148                                 dirlen += nfsm_strtom(nd, dp->d_name, nlen);
2149                                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2150                                 *tl++ = 0;
2151                                 *tl = txdr_unsigned(*cookiep);
2152                                 nfsrv_postopattr(nd, 0, nvap);
2153                                 dirlen += nfsm_fhtom(nd,(u_int8_t *)&nfh,0,1);
2154                                 dirlen += (5*NFSX_UNSIGNED+NFSX_V3POSTOPATTR);
2155                                 if (nvp != NULL)
2156                                         vput(nvp);
2157                         } else {
2158                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
2159                                 *tl++ = newnfs_true;
2160                                 *tl++ = 0;
2161                                 *tl = txdr_unsigned(*cookiep);
2162                                 dirlen += nfsm_strtom(nd, dp->d_name, nlen);
2163                                 if (nvp != NULL) {
2164                                         supports_nfsv4acls =
2165                                             nfs_supportsnfsv4acls(nvp);
2166                                         NFSVOPUNLOCK(nvp, 0);
2167                                 } else
2168                                         supports_nfsv4acls = 0;
2169                                 if (refp != NULL) {
2170                                         dirlen += nfsrv_putreferralattr(nd,
2171                                             &savbits, refp, 0,
2172                                             &nd->nd_repstat);
2173                                         if (nd->nd_repstat) {
2174                                                 if (nvp != NULL)
2175                                                         vrele(nvp);
2176                                                 if (needs_unbusy != 0)
2177                                                         vfs_unbusy(new_mp);
2178                                                 break;
2179                                         }
2180                                 } else if (r) {
2181                                         dirlen += nfsvno_fillattr(nd, new_mp,
2182                                             nvp, nvap, &nfh, r, &rderrbits,
2183                                             nd->nd_cred, p, isdgram, 0,
2184                                             supports_nfsv4acls, at_root,
2185                                             mounted_on_fileno);
2186                                 } else {
2187                                         dirlen += nfsvno_fillattr(nd, new_mp,
2188                                             nvp, nvap, &nfh, r, &attrbits,
2189                                             nd->nd_cred, p, isdgram, 0,
2190                                             supports_nfsv4acls, at_root,
2191                                             mounted_on_fileno);
2192                                 }
2193                                 if (nvp != NULL)
2194                                         vrele(nvp);
2195                                 dirlen += (3 * NFSX_UNSIGNED);
2196                         }
2197                         if (needs_unbusy != 0)
2198                                 vfs_unbusy(new_mp);
2199                         if (dirlen <= cnt)
2200                                 entrycnt++;
2201                 }
2202                 cpos += dp->d_reclen;
2203                 dp = (struct dirent *)cpos;
2204                 cookiep++;
2205                 ncookies--;
2206         }
2207         vrele(vp);
2208         vfs_unbusy(mp);
2209
2210         /*
2211          * If dirlen > cnt, we must strip off the last entry. If that
2212          * results in an empty reply, report NFSERR_TOOSMALL.
2213          */
2214         if (dirlen > cnt || nd->nd_repstat) {
2215                 if (!nd->nd_repstat && entrycnt == 0)
2216                         nd->nd_repstat = NFSERR_TOOSMALL;
2217                 if (nd->nd_repstat)
2218                         newnfs_trimtrailing(nd, mb0, bpos0);
2219                 else
2220                         newnfs_trimtrailing(nd, mb1, bpos1);
2221                 eofflag = 0;
2222         } else if (cpos < cend)
2223                 eofflag = 0;
2224         if (!nd->nd_repstat) {
2225                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2226                 *tl++ = newnfs_false;
2227                 if (eofflag)
2228                         *tl = newnfs_true;
2229                 else
2230                         *tl = newnfs_false;
2231         }
2232         FREE((caddr_t)cookies, M_TEMP);
2233         FREE((caddr_t)rbuf, M_TEMP);
2234
2235 out:
2236         NFSEXITCODE2(0, nd);
2237         return (0);
2238 nfsmout:
2239         vput(vp);
2240         NFSEXITCODE2(error, nd);
2241         return (error);
2242 }
2243
2244 /*
2245  * Get the settable attributes out of the mbuf list.
2246  * (Return 0 or EBADRPC)
2247  */
2248 int
2249 nfsrv_sattr(struct nfsrv_descript *nd, struct nfsvattr *nvap,
2250     nfsattrbit_t *attrbitp, NFSACL_T *aclp, struct thread *p)
2251 {
2252         u_int32_t *tl;
2253         struct nfsv2_sattr *sp;
2254         struct timeval curtime;
2255         int error = 0, toclient = 0;
2256
2257         switch (nd->nd_flag & (ND_NFSV2 | ND_NFSV3 | ND_NFSV4)) {
2258         case ND_NFSV2:
2259                 NFSM_DISSECT(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
2260                 /*
2261                  * Some old clients didn't fill in the high order 16bits.
2262                  * --> check the low order 2 bytes for 0xffff
2263                  */
2264                 if ((fxdr_unsigned(int, sp->sa_mode) & 0xffff) != 0xffff)
2265                         nvap->na_mode = nfstov_mode(sp->sa_mode);
2266                 if (sp->sa_uid != newnfs_xdrneg1)
2267                         nvap->na_uid = fxdr_unsigned(uid_t, sp->sa_uid);
2268                 if (sp->sa_gid != newnfs_xdrneg1)
2269                         nvap->na_gid = fxdr_unsigned(gid_t, sp->sa_gid);
2270                 if (sp->sa_size != newnfs_xdrneg1)
2271                         nvap->na_size = fxdr_unsigned(u_quad_t, sp->sa_size);
2272                 if (sp->sa_atime.nfsv2_sec != newnfs_xdrneg1) {
2273 #ifdef notyet
2274                         fxdr_nfsv2time(&sp->sa_atime, &nvap->na_atime);
2275 #else
2276                         nvap->na_atime.tv_sec =
2277                                 fxdr_unsigned(u_int32_t,sp->sa_atime.nfsv2_sec);
2278                         nvap->na_atime.tv_nsec = 0;
2279 #endif
2280                 }
2281                 if (sp->sa_mtime.nfsv2_sec != newnfs_xdrneg1)
2282                         fxdr_nfsv2time(&sp->sa_mtime, &nvap->na_mtime);
2283                 break;
2284         case ND_NFSV3:
2285                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2286                 if (*tl == newnfs_true) {
2287                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2288                         nvap->na_mode = nfstov_mode(*tl);
2289                 }
2290                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2291                 if (*tl == newnfs_true) {
2292                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2293                         nvap->na_uid = fxdr_unsigned(uid_t, *tl);
2294                 }
2295                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2296                 if (*tl == newnfs_true) {
2297                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2298                         nvap->na_gid = fxdr_unsigned(gid_t, *tl);
2299                 }
2300                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2301                 if (*tl == newnfs_true) {
2302                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2303                         nvap->na_size = fxdr_hyper(tl);
2304                 }
2305                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2306                 switch (fxdr_unsigned(int, *tl)) {
2307                 case NFSV3SATTRTIME_TOCLIENT:
2308                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2309                         fxdr_nfsv3time(tl, &nvap->na_atime);
2310                         toclient = 1;
2311                         break;
2312                 case NFSV3SATTRTIME_TOSERVER:
2313                         NFSGETTIME(&curtime);
2314                         nvap->na_atime.tv_sec = curtime.tv_sec;
2315                         nvap->na_atime.tv_nsec = curtime.tv_usec * 1000;
2316                         nvap->na_vaflags |= VA_UTIMES_NULL;
2317                         break;
2318                 };
2319                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2320                 switch (fxdr_unsigned(int, *tl)) {
2321                 case NFSV3SATTRTIME_TOCLIENT:
2322                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2323                         fxdr_nfsv3time(tl, &nvap->na_mtime);
2324                         nvap->na_vaflags &= ~VA_UTIMES_NULL;
2325                         break;
2326                 case NFSV3SATTRTIME_TOSERVER:
2327                         NFSGETTIME(&curtime);
2328                         nvap->na_mtime.tv_sec = curtime.tv_sec;
2329                         nvap->na_mtime.tv_nsec = curtime.tv_usec * 1000;
2330                         if (!toclient)
2331                                 nvap->na_vaflags |= VA_UTIMES_NULL;
2332                         break;
2333                 };
2334                 break;
2335         case ND_NFSV4:
2336                 error = nfsv4_sattr(nd, nvap, attrbitp, aclp, p);
2337         };
2338 nfsmout:
2339         NFSEXITCODE2(error, nd);
2340         return (error);
2341 }
2342
2343 /*
2344  * Handle the setable attributes for V4.
2345  * Returns NFSERR_BADXDR if it can't be parsed, 0 otherwise.
2346  */
2347 int
2348 nfsv4_sattr(struct nfsrv_descript *nd, struct nfsvattr *nvap,
2349     nfsattrbit_t *attrbitp, NFSACL_T *aclp, struct thread *p)
2350 {
2351         u_int32_t *tl;
2352         int attrsum = 0;
2353         int i, j;
2354         int error, attrsize, bitpos, aclsize, aceerr, retnotsup = 0;
2355         int toclient = 0;
2356         u_char *cp, namestr[NFSV4_SMALLSTR + 1];
2357         uid_t uid;
2358         gid_t gid;
2359         struct timeval curtime;
2360
2361         error = nfsrv_getattrbits(nd, attrbitp, NULL, &retnotsup);
2362         if (error)
2363                 goto nfsmout;
2364         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2365         attrsize = fxdr_unsigned(int, *tl);
2366
2367         /*
2368          * Loop around getting the setable attributes. If an unsupported
2369          * one is found, set nd_repstat == NFSERR_ATTRNOTSUPP and return.
2370          */
2371         if (retnotsup) {
2372                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2373                 bitpos = NFSATTRBIT_MAX;
2374         } else {
2375                 bitpos = 0;
2376         }
2377         for (; bitpos < NFSATTRBIT_MAX; bitpos++) {
2378             if (attrsum > attrsize) {
2379                 error = NFSERR_BADXDR;
2380                 goto nfsmout;
2381             }
2382             if (NFSISSET_ATTRBIT(attrbitp, bitpos))
2383                 switch (bitpos) {
2384                 case NFSATTRBIT_SIZE:
2385                         NFSM_DISSECT(tl, u_int32_t *, NFSX_HYPER);
2386                         nvap->na_size = fxdr_hyper(tl);
2387                         attrsum += NFSX_HYPER;
2388                         break;
2389                 case NFSATTRBIT_ACL:
2390                         error = nfsrv_dissectacl(nd, aclp, &aceerr, &aclsize,
2391                             p);
2392                         if (error)
2393                                 goto nfsmout;
2394                         if (aceerr && !nd->nd_repstat)
2395                                 nd->nd_repstat = aceerr;
2396                         attrsum += aclsize;
2397                         break;
2398                 case NFSATTRBIT_ARCHIVE:
2399                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2400                         if (!nd->nd_repstat)
2401                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2402                         attrsum += NFSX_UNSIGNED;
2403                         break;
2404                 case NFSATTRBIT_HIDDEN:
2405                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2406                         if (!nd->nd_repstat)
2407                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2408                         attrsum += NFSX_UNSIGNED;
2409                         break;
2410                 case NFSATTRBIT_MIMETYPE:
2411                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2412                         i = fxdr_unsigned(int, *tl);
2413                         error = nfsm_advance(nd, NFSM_RNDUP(i), -1);
2414                         if (error)
2415                                 goto nfsmout;
2416                         if (!nd->nd_repstat)
2417                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2418                         attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(i));
2419                         break;
2420                 case NFSATTRBIT_MODE:
2421                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2422                         nvap->na_mode = nfstov_mode(*tl);
2423                         attrsum += NFSX_UNSIGNED;
2424                         break;
2425                 case NFSATTRBIT_OWNER:
2426                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2427                         j = fxdr_unsigned(int, *tl);
2428                         if (j < 0) {
2429                                 error = NFSERR_BADXDR;
2430                                 goto nfsmout;
2431                         }
2432                         if (j > NFSV4_SMALLSTR)
2433                                 cp = malloc(j + 1, M_NFSSTRING, M_WAITOK);
2434                         else
2435                                 cp = namestr;
2436                         error = nfsrv_mtostr(nd, cp, j);
2437                         if (error) {
2438                                 if (j > NFSV4_SMALLSTR)
2439                                         free(cp, M_NFSSTRING);
2440                                 goto nfsmout;
2441                         }
2442                         if (!nd->nd_repstat) {
2443                                 nd->nd_repstat = nfsv4_strtouid(cp,j,&uid,p);
2444                                 if (!nd->nd_repstat)
2445                                         nvap->na_uid = uid;
2446                         }
2447                         if (j > NFSV4_SMALLSTR)
2448                                 free(cp, M_NFSSTRING);
2449                         attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(j));
2450                         break;
2451                 case NFSATTRBIT_OWNERGROUP:
2452                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2453                         j = fxdr_unsigned(int, *tl);
2454                         if (j < 0) {
2455                                 error = NFSERR_BADXDR;
2456                                 goto nfsmout;
2457                         }
2458                         if (j > NFSV4_SMALLSTR)
2459                                 cp = malloc(j + 1, M_NFSSTRING, M_WAITOK);
2460                         else
2461                                 cp = namestr;
2462                         error = nfsrv_mtostr(nd, cp, j);
2463                         if (error) {
2464                                 if (j > NFSV4_SMALLSTR)
2465                                         free(cp, M_NFSSTRING);
2466                                 goto nfsmout;
2467                         }
2468                         if (!nd->nd_repstat) {
2469                                 nd->nd_repstat = nfsv4_strtogid(cp,j,&gid,p);
2470                                 if (!nd->nd_repstat)
2471                                         nvap->na_gid = gid;
2472                         }
2473                         if (j > NFSV4_SMALLSTR)
2474                                 free(cp, M_NFSSTRING);
2475                         attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(j));
2476                         break;
2477                 case NFSATTRBIT_SYSTEM:
2478                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2479                         if (!nd->nd_repstat)
2480                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2481                         attrsum += NFSX_UNSIGNED;
2482                         break;
2483                 case NFSATTRBIT_TIMEACCESSSET:
2484                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2485                         attrsum += NFSX_UNSIGNED;
2486                         if (fxdr_unsigned(int, *tl)==NFSV4SATTRTIME_TOCLIENT) {
2487                             NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2488                             fxdr_nfsv4time(tl, &nvap->na_atime);
2489                             toclient = 1;
2490                             attrsum += NFSX_V4TIME;
2491                         } else {
2492                             NFSGETTIME(&curtime);
2493                             nvap->na_atime.tv_sec = curtime.tv_sec;
2494                             nvap->na_atime.tv_nsec = curtime.tv_usec * 1000;
2495                             nvap->na_vaflags |= VA_UTIMES_NULL;
2496                         }
2497                         break;
2498                 case NFSATTRBIT_TIMEBACKUP:
2499                         NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2500                         if (!nd->nd_repstat)
2501                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2502                         attrsum += NFSX_V4TIME;
2503                         break;
2504                 case NFSATTRBIT_TIMECREATE:
2505                         NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2506                         if (!nd->nd_repstat)
2507                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2508                         attrsum += NFSX_V4TIME;
2509                         break;
2510                 case NFSATTRBIT_TIMEMODIFYSET:
2511                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2512                         attrsum += NFSX_UNSIGNED;
2513                         if (fxdr_unsigned(int, *tl)==NFSV4SATTRTIME_TOCLIENT) {
2514                             NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2515                             fxdr_nfsv4time(tl, &nvap->na_mtime);
2516                             nvap->na_vaflags &= ~VA_UTIMES_NULL;
2517                             attrsum += NFSX_V4TIME;
2518                         } else {
2519                             NFSGETTIME(&curtime);
2520                             nvap->na_mtime.tv_sec = curtime.tv_sec;
2521                             nvap->na_mtime.tv_nsec = curtime.tv_usec * 1000;
2522                             if (!toclient)
2523                                 nvap->na_vaflags |= VA_UTIMES_NULL;
2524                         }
2525                         break;
2526                 default:
2527                         nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2528                         /*
2529                          * set bitpos so we drop out of the loop.
2530                          */
2531                         bitpos = NFSATTRBIT_MAX;
2532                         break;
2533                 };
2534         }
2535
2536         /*
2537          * some clients pad the attrlist, so we need to skip over the
2538          * padding.
2539          */
2540         if (attrsum > attrsize) {
2541                 error = NFSERR_BADXDR;
2542         } else {
2543                 attrsize = NFSM_RNDUP(attrsize);
2544                 if (attrsum < attrsize)
2545                         error = nfsm_advance(nd, attrsize - attrsum, -1);
2546         }
2547 nfsmout:
2548         NFSEXITCODE2(error, nd);
2549         return (error);
2550 }
2551
2552 /*
2553  * Check/setup export credentials.
2554  */
2555 int
2556 nfsd_excred(struct nfsrv_descript *nd, struct nfsexstuff *exp,
2557     struct ucred *credanon)
2558 {
2559         int error = 0;
2560
2561         /*
2562          * Check/setup credentials.
2563          */
2564         if (nd->nd_flag & ND_GSS)
2565                 exp->nes_exflag &= ~MNT_EXPORTANON;
2566
2567         /*
2568          * Check to see if the operation is allowed for this security flavor.
2569          * RFC2623 suggests that the NFSv3 Fsinfo RPC be allowed to
2570          * AUTH_NONE or AUTH_SYS for file systems requiring RPCSEC_GSS.
2571          * Also, allow Secinfo, so that it can acquire the correct flavor(s).
2572          */
2573         if (nfsvno_testexp(nd, exp) &&
2574             nd->nd_procnum != NFSV4OP_SECINFO &&
2575             nd->nd_procnum != NFSPROC_FSINFO) {
2576                 if (nd->nd_flag & ND_NFSV4)
2577                         error = NFSERR_WRONGSEC;
2578                 else
2579                         error = (NFSERR_AUTHERR | AUTH_TOOWEAK);
2580                 goto out;
2581         }
2582
2583         /*
2584          * Check to see if the file system is exported V4 only.
2585          */
2586         if (NFSVNO_EXV4ONLY(exp) && !(nd->nd_flag & ND_NFSV4)) {
2587                 error = NFSERR_PROGNOTV4;
2588                 goto out;
2589         }
2590
2591         /*
2592          * Now, map the user credentials.
2593          * (Note that ND_AUTHNONE will only be set for an NFSv3
2594          *  Fsinfo RPC. If set for anything else, this code might need
2595          *  to change.)
2596          */
2597         if (NFSVNO_EXPORTED(exp) &&
2598             ((!(nd->nd_flag & ND_GSS) && nd->nd_cred->cr_uid == 0) ||
2599              NFSVNO_EXPORTANON(exp) ||
2600              (nd->nd_flag & ND_AUTHNONE))) {
2601                 nd->nd_cred->cr_uid = credanon->cr_uid;
2602                 nd->nd_cred->cr_gid = credanon->cr_gid;
2603                 crsetgroups(nd->nd_cred, credanon->cr_ngroups,
2604                     credanon->cr_groups);
2605         }
2606
2607 out:
2608         NFSEXITCODE2(error, nd);
2609         return (error);
2610 }
2611
2612 /*
2613  * Check exports.
2614  */
2615 int
2616 nfsvno_checkexp(struct mount *mp, struct sockaddr *nam, struct nfsexstuff *exp,
2617     struct ucred **credp)
2618 {
2619         int i, error, *secflavors;
2620
2621         error = VFS_CHECKEXP(mp, nam, &exp->nes_exflag, credp,
2622             &exp->nes_numsecflavor, &secflavors);
2623         if (error) {
2624                 if (nfs_rootfhset) {
2625                         exp->nes_exflag = 0;
2626                         exp->nes_numsecflavor = 0;
2627                         error = 0;
2628                 }
2629         } else {
2630                 /* Copy the security flavors. */
2631                 for (i = 0; i < exp->nes_numsecflavor; i++)
2632                         exp->nes_secflavors[i] = secflavors[i];
2633         }
2634         NFSEXITCODE(error);
2635         return (error);
2636 }
2637
2638 /*
2639  * Get a vnode for a file handle and export stuff.
2640  */
2641 int
2642 nfsvno_fhtovp(struct mount *mp, fhandle_t *fhp, struct sockaddr *nam,
2643     int lktype, struct vnode **vpp, struct nfsexstuff *exp,
2644     struct ucred **credp)
2645 {
2646         int i, error, *secflavors;
2647
2648         *credp = NULL;
2649         exp->nes_numsecflavor = 0;
2650         if (VFS_NEEDSGIANT(mp))
2651                 error = ESTALE;
2652         else
2653                 error = VFS_FHTOVP(mp, &fhp->fh_fid, LK_EXCLUSIVE, vpp);
2654         if (error != 0)
2655                 /* Make sure the server replies ESTALE to the client. */
2656                 error = ESTALE;
2657         if (nam && !error) {
2658                 error = VFS_CHECKEXP(mp, nam, &exp->nes_exflag, credp,
2659                     &exp->nes_numsecflavor, &secflavors);
2660                 if (error) {
2661                         if (nfs_rootfhset) {
2662                                 exp->nes_exflag = 0;
2663                                 exp->nes_numsecflavor = 0;
2664                                 error = 0;
2665                         } else {
2666                                 vput(*vpp);
2667                         }
2668                 } else {
2669                         /* Copy the security flavors. */
2670                         for (i = 0; i < exp->nes_numsecflavor; i++)
2671                                 exp->nes_secflavors[i] = secflavors[i];
2672                 }
2673         }
2674         if (error == 0 && lktype == LK_SHARED)
2675                 /*
2676                  * It would be much better to pass lktype to VFS_FHTOVP(),
2677                  * but this will have to do until VFS_FHTOVP() has a lock
2678                  * type argument like VFS_VGET().
2679                  */
2680                 NFSVOPLOCK(*vpp, LK_DOWNGRADE | LK_RETRY);
2681
2682         NFSEXITCODE(error);
2683         return (error);
2684 }
2685
2686 /*
2687  * nfsd_fhtovp() - convert a fh to a vnode ptr
2688  *      - look up fsid in mount list (if not found ret error)
2689  *      - get vp and export rights by calling nfsvno_fhtovp()
2690  *      - if cred->cr_uid == 0 or MNT_EXPORTANON set it to credanon
2691  *        for AUTH_SYS
2692  *      - if mpp != NULL, return the mount point so that it can
2693  *        be used for vn_finished_write() by the caller
2694  */
2695 void
2696 nfsd_fhtovp(struct nfsrv_descript *nd, struct nfsrvfh *nfp, int lktype,
2697     struct vnode **vpp, struct nfsexstuff *exp,
2698     struct mount **mpp, int startwrite, struct thread *p)
2699 {
2700         struct mount *mp;
2701         struct ucred *credanon;
2702         fhandle_t *fhp;
2703
2704         fhp = (fhandle_t *)nfp->nfsrvfh_data;
2705         /*
2706          * Check for the special case of the nfsv4root_fh.
2707          */
2708         mp = vfs_busyfs(&fhp->fh_fsid);
2709         if (mpp != NULL)
2710                 *mpp = mp;
2711         if (mp == NULL) {
2712                 *vpp = NULL;
2713                 nd->nd_repstat = ESTALE;
2714                 goto out;
2715         }
2716
2717         if (startwrite)
2718                 vn_start_write(NULL, mpp, V_WAIT);
2719
2720         nd->nd_repstat = nfsvno_fhtovp(mp, fhp, nd->nd_nam, lktype, vpp, exp,
2721             &credanon);
2722         vfs_unbusy(mp);
2723
2724         /*
2725          * For NFSv4 without a pseudo root fs, unexported file handles
2726          * can be returned, so that Lookup works everywhere.
2727          */
2728         if (!nd->nd_repstat && exp->nes_exflag == 0 &&
2729             !(nd->nd_flag & ND_NFSV4)) {
2730                 vput(*vpp);
2731                 nd->nd_repstat = EACCES;
2732         }
2733
2734         /*
2735          * Personally, I've never seen any point in requiring a
2736          * reserved port#, since only in the rare case where the
2737          * clients are all boxes with secure system priviledges,
2738          * does it provide any enhanced security, but... some people
2739          * believe it to be useful and keep putting this code back in.
2740          * (There is also some "security checker" out there that
2741          *  complains if the nfs server doesn't enforce this.)
2742          * However, note the following:
2743          * RFC3530 (NFSv4) specifies that a reserved port# not be
2744          *      required.
2745          * RFC2623 recommends that, if a reserved port# is checked for,
2746          *      that there be a way to turn that off--> ifdef'd.
2747          */
2748 #ifdef NFS_REQRSVPORT
2749         if (!nd->nd_repstat) {
2750                 struct sockaddr_in *saddr;
2751                 struct sockaddr_in6 *saddr6;
2752
2753                 saddr = NFSSOCKADDR(nd->nd_nam, struct sockaddr_in *);
2754                 saddr6 = NFSSOCKADDR(nd->nd_nam, struct sockaddr_in6 *);
2755                 if (!(nd->nd_flag & ND_NFSV4) &&
2756                     ((saddr->sin_family == AF_INET &&
2757                       ntohs(saddr->sin_port) >= IPPORT_RESERVED) ||
2758                      (saddr6->sin6_family == AF_INET6 &&
2759                       ntohs(saddr6->sin6_port) >= IPPORT_RESERVED))) {
2760                         vput(*vpp);
2761                         nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
2762                 }
2763         }
2764 #endif  /* NFS_REQRSVPORT */
2765
2766         /*
2767          * Check/setup credentials.
2768          */
2769         if (!nd->nd_repstat) {
2770                 nd->nd_saveduid = nd->nd_cred->cr_uid;
2771                 nd->nd_repstat = nfsd_excred(nd, exp, credanon);
2772                 if (nd->nd_repstat)
2773                         vput(*vpp);
2774         }
2775         if (credanon != NULL)
2776                 crfree(credanon);
2777         if (nd->nd_repstat) {
2778                 if (startwrite)
2779                         vn_finished_write(mp);
2780                 *vpp = NULL;
2781                 if (mpp != NULL)
2782                         *mpp = NULL;
2783         }
2784
2785 out:
2786         NFSEXITCODE2(0, nd);
2787 }
2788
2789 /*
2790  * glue for fp.
2791  */
2792 int
2793 fp_getfvp(struct thread *p, int fd, struct file **fpp, struct vnode **vpp)
2794 {
2795         struct filedesc *fdp;
2796         struct file *fp;
2797         int error = 0;
2798
2799         fdp = p->td_proc->p_fd;
2800         if (fd >= fdp->fd_nfiles ||
2801             (fp = fdp->fd_ofiles[fd]) == NULL) {
2802                 error = EBADF;
2803                 goto out;
2804         }
2805         *fpp = fp;
2806
2807 out:
2808         NFSEXITCODE(error);
2809         return (error);
2810 }
2811
2812 /*
2813  * Called from nfssvc() to update the exports list. Just call
2814  * vfs_export(). This has to be done, since the v4 root fake fs isn't
2815  * in the mount list.
2816  */
2817 int
2818 nfsrv_v4rootexport(void *argp, struct ucred *cred, struct thread *p)
2819 {
2820         struct nfsex_args *nfsexargp = (struct nfsex_args *)argp;
2821         int error = 0;
2822         struct nameidata nd;
2823         fhandle_t fh;
2824
2825         error = vfs_export(&nfsv4root_mnt, &nfsexargp->export);
2826         if ((nfsexargp->export.ex_flags & MNT_DELEXPORT) != 0)
2827                 nfs_rootfhset = 0;
2828         else if (error == 0) {
2829                 if (nfsexargp->fspec == NULL) {
2830                         error = EPERM;
2831                         goto out;
2832                 }
2833                 /*
2834                  * If fspec != NULL, this is the v4root path.
2835                  */
2836                 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE, UIO_USERSPACE,
2837                     nfsexargp->fspec, p);
2838                 if ((error = namei(&nd)) != 0)
2839                         goto out;
2840                 error = nfsvno_getfh(nd.ni_vp, &fh, p);
2841                 vrele(nd.ni_vp);
2842                 if (!error) {
2843                         nfs_rootfh.nfsrvfh_len = NFSX_MYFH;
2844                         NFSBCOPY((caddr_t)&fh,
2845                             nfs_rootfh.nfsrvfh_data,
2846                             sizeof (fhandle_t));
2847                         nfs_rootfhset = 1;
2848                 }
2849         }
2850
2851 out:
2852         NFSEXITCODE(error);
2853         return (error);
2854 }
2855
2856 /*
2857  * Get the tcp socket sequence numbers we need.
2858  * (Maybe this should be moved to the tcp sources?)
2859  */
2860 int
2861 nfsrv_getsocksndseq(struct socket *so, tcp_seq *maxp, tcp_seq *unap)
2862 {
2863         struct inpcb *inp;
2864         struct tcpcb *tp;
2865         int error = 0;
2866
2867         inp = sotoinpcb(so);
2868         KASSERT(inp != NULL, ("nfsrv_getsocksndseq: inp == NULL"));
2869         INP_RLOCK(inp);
2870         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
2871                 INP_RUNLOCK(inp);
2872                 error = EPIPE;
2873                 goto out;
2874         }
2875         tp = intotcpcb(inp);
2876         if (tp->t_state != TCPS_ESTABLISHED) {
2877                 INP_RUNLOCK(inp);
2878                 error = EPIPE;
2879                 goto out;
2880         }
2881         *maxp = tp->snd_max;
2882         *unap = tp->snd_una;
2883         INP_RUNLOCK(inp);
2884
2885 out:
2886         NFSEXITCODE(error);
2887         return (error);
2888 }
2889
2890 /*
2891  * This function needs to test to see if the system is near its limit
2892  * for memory allocation via malloc() or mget() and return True iff
2893  * either of these resources are near their limit.
2894  * XXX (For now, this is just a stub.)
2895  */
2896 int nfsrv_testmalloclimit = 0;
2897 int
2898 nfsrv_mallocmget_limit(void)
2899 {
2900         static int printmesg = 0;
2901         static int testval = 1;
2902
2903         if (nfsrv_testmalloclimit && (testval++ % 1000) == 0) {
2904                 if ((printmesg++ % 100) == 0)
2905                         printf("nfsd: malloc/mget near limit\n");
2906                 return (1);
2907         }
2908         return (0);
2909 }
2910
2911 /*
2912  * BSD specific initialization of a mount point.
2913  */
2914 void
2915 nfsd_mntinit(void)
2916 {
2917         static int inited = 0;
2918
2919         if (inited)
2920                 return;
2921         inited = 1;
2922         nfsv4root_mnt.mnt_flag = (MNT_RDONLY | MNT_EXPORTED);
2923         TAILQ_INIT(&nfsv4root_mnt.mnt_nvnodelist);
2924         TAILQ_INIT(&nfsv4root_mnt.mnt_activevnodelist);
2925         nfsv4root_mnt.mnt_export = NULL;
2926         TAILQ_INIT(&nfsv4root_opt);
2927         TAILQ_INIT(&nfsv4root_newopt);
2928         nfsv4root_mnt.mnt_opt = &nfsv4root_opt;
2929         nfsv4root_mnt.mnt_optnew = &nfsv4root_newopt;
2930         nfsv4root_mnt.mnt_nvnodelistsize = 0;
2931         nfsv4root_mnt.mnt_activevnodelistsize = 0;
2932 }
2933
2934 /*
2935  * Get a vnode for a file handle, without checking exports, etc.
2936  */
2937 struct vnode *
2938 nfsvno_getvp(fhandle_t *fhp)
2939 {
2940         struct mount *mp;
2941         struct vnode *vp;
2942         int error;
2943
2944         mp = vfs_busyfs(&fhp->fh_fsid);
2945         if (mp == NULL)
2946                 return (NULL);
2947         error = VFS_FHTOVP(mp, &fhp->fh_fid, LK_EXCLUSIVE, &vp);
2948         vfs_unbusy(mp);
2949         if (error)
2950                 return (NULL);
2951         return (vp);
2952 }
2953
2954 /*
2955  * Do a local VOP_ADVLOCK().
2956  */
2957 int
2958 nfsvno_advlock(struct vnode *vp, int ftype, u_int64_t first,
2959     u_int64_t end, struct thread *td)
2960 {
2961         int error = 0;
2962         struct flock fl;
2963         u_int64_t tlen;
2964
2965         if (nfsrv_dolocallocks == 0)
2966                 goto out;
2967
2968         /* Check for VI_DOOMED here, so that VOP_ADVLOCK() isn't performed. */
2969         if ((vp->v_iflag & VI_DOOMED) != 0) {
2970                 error = EPERM;
2971                 goto out;
2972         }
2973
2974         fl.l_whence = SEEK_SET;
2975         fl.l_type = ftype;
2976         fl.l_start = (off_t)first;
2977         if (end == NFS64BITSSET) {
2978                 fl.l_len = 0;
2979         } else {
2980                 tlen = end - first;
2981                 fl.l_len = (off_t)tlen;
2982         }
2983         /*
2984          * For FreeBSD8, the l_pid and l_sysid must be set to the same
2985          * values for all calls, so that all locks will be held by the
2986          * nfsd server. (The nfsd server handles conflicts between the
2987          * various clients.)
2988          * Since an NFSv4 lockowner is a ClientID plus an array of up to 1024
2989          * bytes, so it can't be put in l_sysid.
2990          */
2991         if (nfsv4_sysid == 0)
2992                 nfsv4_sysid = nlm_acquire_next_sysid();
2993         fl.l_pid = (pid_t)0;
2994         fl.l_sysid = (int)nfsv4_sysid;
2995
2996         NFSVOPUNLOCK(vp, 0);
2997         if (ftype == F_UNLCK)
2998                 error = VOP_ADVLOCK(vp, (caddr_t)td->td_proc, F_UNLCK, &fl,
2999                     (F_POSIX | F_REMOTE));
3000         else
3001                 error = VOP_ADVLOCK(vp, (caddr_t)td->td_proc, F_SETLK, &fl,
3002                     (F_POSIX | F_REMOTE));
3003         NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
3004
3005 out:
3006         NFSEXITCODE(error);
3007         return (error);
3008 }
3009
3010 /*
3011  * Check the nfsv4 root exports.
3012  */
3013 int
3014 nfsvno_v4rootexport(struct nfsrv_descript *nd)
3015 {
3016         struct ucred *credanon;
3017         int exflags, error = 0, numsecflavor, *secflavors, i;
3018
3019         error = vfs_stdcheckexp(&nfsv4root_mnt, nd->nd_nam, &exflags,
3020             &credanon, &numsecflavor, &secflavors);
3021         if (error) {
3022                 error = NFSERR_PROGUNAVAIL;
3023                 goto out;
3024         }
3025         if (credanon != NULL)
3026                 crfree(credanon);
3027         for (i = 0; i < numsecflavor; i++) {
3028                 if (secflavors[i] == AUTH_SYS)
3029                         nd->nd_flag |= ND_EXAUTHSYS;
3030                 else if (secflavors[i] == RPCSEC_GSS_KRB5)
3031                         nd->nd_flag |= ND_EXGSS;
3032                 else if (secflavors[i] == RPCSEC_GSS_KRB5I)
3033                         nd->nd_flag |= ND_EXGSSINTEGRITY;
3034                 else if (secflavors[i] == RPCSEC_GSS_KRB5P)
3035                         nd->nd_flag |= ND_EXGSSPRIVACY;
3036         }
3037
3038 out:
3039         NFSEXITCODE(error);
3040         return (error);
3041 }
3042
3043 /*
3044  * Nfs server psuedo system call for the nfsd's
3045  */
3046 /*
3047  * MPSAFE
3048  */
3049 static int
3050 nfssvc_nfsd(struct thread *td, struct nfssvc_args *uap)
3051 {
3052         struct file *fp;
3053         struct nfsd_addsock_args sockarg;
3054         struct nfsd_nfsd_args nfsdarg;
3055         int error;
3056
3057         if (uap->flag & NFSSVC_NFSDADDSOCK) {
3058                 error = copyin(uap->argp, (caddr_t)&sockarg, sizeof (sockarg));
3059                 if (error)
3060                         goto out;
3061                 /*
3062                  * Since we don't know what rights might be required,
3063                  * pretend that we need them all. It is better to be too
3064                  * careful than too reckless.
3065                  */
3066                 if ((error = fget(td, sockarg.sock, CAP_SOCK_ALL, &fp)) != 0)
3067                         goto out;
3068                 if (fp->f_type != DTYPE_SOCKET) {
3069                         fdrop(fp, td);
3070                         error = EPERM;
3071                         goto out;
3072                 }
3073                 error = nfsrvd_addsock(fp);
3074                 fdrop(fp, td);
3075         } else if (uap->flag & NFSSVC_NFSDNFSD) {
3076                 if (uap->argp == NULL) {
3077                         error = EINVAL;
3078                         goto out;
3079                 }
3080                 error = copyin(uap->argp, (caddr_t)&nfsdarg,
3081                     sizeof (nfsdarg));
3082                 if (error)
3083                         goto out;
3084                 error = nfsrvd_nfsd(td, &nfsdarg);
3085         } else {
3086                 error = nfssvc_srvcall(td, uap, td->td_ucred);
3087         }
3088
3089 out:
3090         NFSEXITCODE(error);
3091         return (error);
3092 }
3093
3094 static int
3095 nfssvc_srvcall(struct thread *p, struct nfssvc_args *uap, struct ucred *cred)
3096 {
3097         struct nfsex_args export;
3098         struct file *fp = NULL;
3099         int stablefd, len;
3100         struct nfsd_clid adminrevoke;
3101         struct nfsd_dumplist dumplist;
3102         struct nfsd_dumpclients *dumpclients;
3103         struct nfsd_dumplocklist dumplocklist;
3104         struct nfsd_dumplocks *dumplocks;
3105         struct nameidata nd;
3106         vnode_t vp;
3107         int error = EINVAL;
3108         struct proc *procp;
3109
3110         if (uap->flag & NFSSVC_PUBLICFH) {
3111                 NFSBZERO((caddr_t)&nfs_pubfh.nfsrvfh_data,
3112                     sizeof (fhandle_t));
3113                 error = copyin(uap->argp,
3114                     &nfs_pubfh.nfsrvfh_data, sizeof (fhandle_t));
3115                 if (!error)
3116                         nfs_pubfhset = 1;
3117         } else if (uap->flag & NFSSVC_V4ROOTEXPORT) {
3118                 error = copyin(uap->argp,(caddr_t)&export,
3119                     sizeof (struct nfsex_args));
3120                 if (!error)
3121                         error = nfsrv_v4rootexport(&export, cred, p);
3122         } else if (uap->flag & NFSSVC_NOPUBLICFH) {
3123                 nfs_pubfhset = 0;
3124                 error = 0;
3125         } else if (uap->flag & NFSSVC_STABLERESTART) {
3126                 error = copyin(uap->argp, (caddr_t)&stablefd,
3127                     sizeof (int));
3128                 if (!error)
3129                         error = fp_getfvp(p, stablefd, &fp, &vp);
3130                 if (!error && (NFSFPFLAG(fp) & (FREAD | FWRITE)) != (FREAD | FWRITE))
3131                         error = EBADF;
3132                 if (!error && newnfs_numnfsd != 0)
3133                         error = EPERM;
3134                 if (!error) {
3135                         nfsrv_stablefirst.nsf_fp = fp;
3136                         nfsrv_setupstable(p);
3137                 }
3138         } else if (uap->flag & NFSSVC_ADMINREVOKE) {
3139                 error = copyin(uap->argp, (caddr_t)&adminrevoke,
3140                     sizeof (struct nfsd_clid));
3141                 if (!error)
3142                         error = nfsrv_adminrevoke(&adminrevoke, p);
3143         } else if (uap->flag & NFSSVC_DUMPCLIENTS) {
3144                 error = copyin(uap->argp, (caddr_t)&dumplist,
3145                     sizeof (struct nfsd_dumplist));
3146                 if (!error && (dumplist.ndl_size < 1 ||
3147                         dumplist.ndl_size > NFSRV_MAXDUMPLIST))
3148                         error = EPERM;
3149                 if (!error) {
3150                     len = sizeof (struct nfsd_dumpclients) * dumplist.ndl_size;
3151                     dumpclients = (struct nfsd_dumpclients *)malloc(len,
3152                         M_TEMP, M_WAITOK);
3153                     nfsrv_dumpclients(dumpclients, dumplist.ndl_size);
3154                     error = copyout(dumpclients,
3155                         CAST_USER_ADDR_T(dumplist.ndl_list), len);
3156                     free((caddr_t)dumpclients, M_TEMP);
3157                 }
3158         } else if (uap->flag & NFSSVC_DUMPLOCKS) {
3159                 error = copyin(uap->argp, (caddr_t)&dumplocklist,
3160                     sizeof (struct nfsd_dumplocklist));
3161                 if (!error && (dumplocklist.ndllck_size < 1 ||
3162                         dumplocklist.ndllck_size > NFSRV_MAXDUMPLIST))
3163                         error = EPERM;
3164                 if (!error)
3165                         error = nfsrv_lookupfilename(&nd,
3166                                 dumplocklist.ndllck_fname, p);
3167                 if (!error) {
3168                         len = sizeof (struct nfsd_dumplocks) *
3169                                 dumplocklist.ndllck_size;
3170                         dumplocks = (struct nfsd_dumplocks *)malloc(len,
3171                                 M_TEMP, M_WAITOK);
3172                         nfsrv_dumplocks(nd.ni_vp, dumplocks,
3173                             dumplocklist.ndllck_size, p);
3174                         vput(nd.ni_vp);
3175                         error = copyout(dumplocks,
3176                             CAST_USER_ADDR_T(dumplocklist.ndllck_list), len);
3177                         free((caddr_t)dumplocks, M_TEMP);
3178                 }
3179         } else if (uap->flag & NFSSVC_BACKUPSTABLE) {
3180                 procp = p->td_proc;
3181                 PROC_LOCK(procp);
3182                 nfsd_master_pid = procp->p_pid;
3183                 bcopy(procp->p_comm, nfsd_master_comm, MAXCOMLEN + 1);
3184                 nfsd_master_start = procp->p_stats->p_start;
3185                 nfsd_master_proc = procp;
3186                 PROC_UNLOCK(procp);
3187         }
3188
3189         NFSEXITCODE(error);
3190         return (error);
3191 }
3192
3193 /*
3194  * Check exports.
3195  * Returns 0 if ok, 1 otherwise.
3196  */
3197 int
3198 nfsvno_testexp(struct nfsrv_descript *nd, struct nfsexstuff *exp)
3199 {
3200         int i;
3201
3202         /*
3203          * This seems odd, but allow the case where the security flavor
3204          * list is empty. This happens when NFSv4 is traversing non-exported
3205          * file systems. Exported file systems should always have a non-empty
3206          * security flavor list.
3207          */
3208         if (exp->nes_numsecflavor == 0)
3209                 return (0);
3210
3211         for (i = 0; i < exp->nes_numsecflavor; i++) {
3212                 /*
3213                  * The tests for privacy and integrity must be first,
3214                  * since ND_GSS is set for everything but AUTH_SYS.
3215                  */
3216                 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5P &&
3217                     (nd->nd_flag & ND_GSSPRIVACY))
3218                         return (0);
3219                 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5I &&
3220                     (nd->nd_flag & ND_GSSINTEGRITY))
3221                         return (0);
3222                 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5 &&
3223                     (nd->nd_flag & ND_GSS))
3224                         return (0);
3225                 if (exp->nes_secflavors[i] == AUTH_SYS &&
3226                     (nd->nd_flag & ND_GSS) == 0)
3227                         return (0);
3228         }
3229         return (1);
3230 }
3231
3232 /*
3233  * Calculate a hash value for the fid in a file handle.
3234  */
3235 uint32_t
3236 nfsrv_hashfh(fhandle_t *fhp)
3237 {
3238         uint32_t hashval;
3239
3240         hashval = hash32_buf(&fhp->fh_fid, sizeof(struct fid), 0);
3241         return (hashval);
3242 }
3243
3244 /*
3245  * Signal the userland master nfsd to backup the stable restart file.
3246  */
3247 void
3248 nfsrv_backupstable(void)
3249 {
3250         struct proc *procp;
3251
3252         if (nfsd_master_proc != NULL) {
3253                 procp = pfind(nfsd_master_pid);
3254                 /* Try to make sure it is the correct process. */
3255                 if (procp == nfsd_master_proc &&
3256                     procp->p_stats->p_start.tv_sec ==
3257                     nfsd_master_start.tv_sec &&
3258                     procp->p_stats->p_start.tv_usec ==
3259                     nfsd_master_start.tv_usec &&
3260                     strcmp(procp->p_comm, nfsd_master_comm) == 0)
3261                         kern_psignal(procp, SIGUSR2);
3262                 else
3263                         nfsd_master_proc = NULL;
3264
3265                 if (procp != NULL)
3266                         PROC_UNLOCK(procp);
3267         }
3268 }
3269
3270 extern int (*nfsd_call_nfsd)(struct thread *, struct nfssvc_args *);
3271
3272 /*
3273  * Called once to initialize data structures...
3274  */
3275 static int
3276 nfsd_modevent(module_t mod, int type, void *data)
3277 {
3278         int error = 0;
3279         static int loaded = 0;
3280
3281         switch (type) {
3282         case MOD_LOAD:
3283                 if (loaded)
3284                         goto out;
3285                 newnfs_portinit();
3286                 mtx_init(&nfs_cache_mutex, "nfs_cache_mutex", NULL, MTX_DEF);
3287                 mtx_init(&nfs_v4root_mutex, "nfs_v4root_mutex", NULL, MTX_DEF);
3288                 mtx_init(&nfsv4root_mnt.mnt_mtx, "struct mount mtx", NULL,
3289                     MTX_DEF);
3290                 lockinit(&nfsv4root_mnt.mnt_explock, PVFS, "explock", 0, 0);
3291                 nfsrvd_initcache();
3292                 nfsd_init();
3293                 NFSD_LOCK();
3294                 nfsrvd_init(0);
3295                 NFSD_UNLOCK();
3296                 nfsd_mntinit();
3297 #ifdef VV_DISABLEDELEG
3298                 vn_deleg_ops.vndeleg_recall = nfsd_recalldelegation;
3299                 vn_deleg_ops.vndeleg_disable = nfsd_disabledelegation;
3300 #endif
3301                 nfsd_call_servertimer = nfsrv_servertimer;
3302                 nfsd_call_nfsd = nfssvc_nfsd;
3303                 loaded = 1;
3304                 break;
3305
3306         case MOD_UNLOAD:
3307                 if (newnfs_numnfsd != 0) {
3308                         error = EBUSY;
3309                         break;
3310                 }
3311
3312 #ifdef VV_DISABLEDELEG
3313                 vn_deleg_ops.vndeleg_recall = NULL;
3314                 vn_deleg_ops.vndeleg_disable = NULL;
3315 #endif
3316                 nfsd_call_servertimer = NULL;
3317                 nfsd_call_nfsd = NULL;
3318
3319                 /* Clean out all NFSv4 state. */
3320                 nfsrv_throwawayallstate(curthread);
3321
3322                 /* Clean the NFS server reply cache */
3323                 nfsrvd_cleancache();
3324
3325                 /* Free up the krpc server pool. */
3326                 if (nfsrvd_pool != NULL)
3327                         svcpool_destroy(nfsrvd_pool);
3328
3329                 /* and get rid of the locks */
3330                 mtx_destroy(&nfs_cache_mutex);
3331                 mtx_destroy(&nfs_v4root_mutex);
3332                 mtx_destroy(&nfsv4root_mnt.mnt_mtx);
3333                 lockdestroy(&nfsv4root_mnt.mnt_explock);
3334                 loaded = 0;
3335                 break;
3336         default:
3337                 error = EOPNOTSUPP;
3338                 break;
3339         }
3340
3341 out:
3342         NFSEXITCODE(error);
3343         return (error);
3344 }
3345 static moduledata_t nfsd_mod = {
3346         "nfsd",
3347         nfsd_modevent,
3348         NULL,
3349 };
3350 DECLARE_MODULE(nfsd, nfsd_mod, SI_SUB_VFS, SI_ORDER_ANY);
3351
3352 /* So that loader and kldload(2) can find us, wherever we are.. */
3353 MODULE_VERSION(nfsd, 1);
3354 MODULE_DEPEND(nfsd, nfscommon, 1, 1, 1);
3355 MODULE_DEPEND(nfsd, nfslock, 1, 1, 1);
3356 MODULE_DEPEND(nfsd, nfslockd, 1, 1, 1);
3357 MODULE_DEPEND(nfsd, krpc, 1, 1, 1);
3358 MODULE_DEPEND(nfsd, nfssvc, 1, 1, 1);
3359