sys/fs/nfsserver/nfs_nfsdport.c

   1 /*-
   2  * Copyright (c) 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Rick Macklem at The University of Guelph.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 4. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  */
  33
  34 #include <sys/cdefs.h>
  35 __FBSDID("$FreeBSD$");
  36
  37 #include <sys/capability.h>
  38
  39 /*
  40  * Functions that perform the vfs operations required by the routines in
  41  * nfsd_serv.c. It is hoped that this change will make the server more
  42  * portable.
  43  */
  44
  45 #include <fs/nfs/nfsport.h>
  46 #include <sys/hash.h>
  47 #include <sys/sysctl.h>
  48 #include <nlm/nlm_prot.h>
  49 #include <nlm/nlm.h>
  50
  51 FEATURE(nfsd, "NFSv4 server");
  52
  53 extern u_int32_t newnfs_true, newnfs_false, newnfs_xdrneg1;
  54 extern int nfsrv_useacl;
  55 extern int newnfs_numnfsd;
  56 extern struct mount nfsv4root_mnt;
  57 extern struct nfsrv_stablefirst nfsrv_stablefirst;
  58 extern void (*nfsd_call_servertimer)(void);
  59 extern SVCPOOL  *nfsrvd_pool;
  60 extern struct nfsv4lock nfsd_suspend_lock;
  61 extern struct nfssessionhash nfssessionhash[NFSSESSIONHASHSIZE];
  62 struct vfsoptlist nfsv4root_opt, nfsv4root_newopt;
  63 NFSDLOCKMUTEX;
  64 struct nfsrchash_bucket nfsrchash_table[NFSRVCACHE_HASHSIZE];
  65 struct nfsrchash_bucket nfsrcahash_table[NFSRVCACHE_HASHSIZE];
  66 struct mtx nfsrc_udpmtx;
  67 struct mtx nfs_v4root_mutex;
  68 struct nfsrvfh nfs_rootfh, nfs_pubfh;
  69 int nfs_pubfhset = 0, nfs_rootfhset = 0;
  70 struct proc *nfsd_master_proc = NULL;
  71 int nfsd_debuglevel = 0;
  72 static pid_t nfsd_master_pid = (pid_t)-1;
  73 static char nfsd_master_comm[MAXCOMLEN + 1];
  74 static struct timeval nfsd_master_start;
  75 static uint32_t nfsv4_sysid = 0;
  76
  77 static int nfssvc_srvcall(struct thread *, struct nfssvc_args *,
  78     struct ucred *);
  79
  80 int nfsrv_enable_crossmntpt = 1;
  81 static int nfs_commit_blks;
  82 static int nfs_commit_miss;
  83 extern int nfsrv_issuedelegs;
  84 extern int nfsrv_dolocallocks;
  85 extern int nfsd_enable_stringtouid;
  86
  87 SYSCTL_NODE(_vfs, OID_AUTO, nfsd, CTLFLAG_RW, 0, "New NFS server");
  88 SYSCTL_INT(_vfs_nfsd, OID_AUTO, mirrormnt, CTLFLAG_RW,
  89     &nfsrv_enable_crossmntpt, 0, "Enable nfsd to cross mount points");
  90 SYSCTL_INT(_vfs_nfsd, OID_AUTO, commit_blks, CTLFLAG_RW, &nfs_commit_blks,
  91     0, "");
  92 SYSCTL_INT(_vfs_nfsd, OID_AUTO, commit_miss, CTLFLAG_RW, &nfs_commit_miss,
  93     0, "");
  94 SYSCTL_INT(_vfs_nfsd, OID_AUTO, issue_delegations, CTLFLAG_RW,
  95     &nfsrv_issuedelegs, 0, "Enable nfsd to issue delegations");
  96 SYSCTL_INT(_vfs_nfsd, OID_AUTO, enable_locallocks, CTLFLAG_RW,
  97     &nfsrv_dolocallocks, 0, "Enable nfsd to acquire local locks on files");
  98 SYSCTL_INT(_vfs_nfsd, OID_AUTO, debuglevel, CTLFLAG_RW, &nfsd_debuglevel,
  99     0, "Debug level for new nfs server");
 100 SYSCTL_INT(_vfs_nfsd, OID_AUTO, enable_stringtouid, CTLFLAG_RW,
 101     &nfsd_enable_stringtouid, 0, "Enable nfsd to accept numeric owner_names");
 102
 103 #define MAX_REORDERED_RPC       16
 104 #define NUM_HEURISTIC           1031
 105 #define NHUSE_INIT              64
 106 #define NHUSE_INC               16
 107 #define NHUSE_MAX               2048
 108
 109 static struct nfsheur {
 110         struct vnode *nh_vp;    /* vp to match (unreferenced pointer) */
 111         off_t nh_nextoff;       /* next offset for sequential detection */
 112         int nh_use;             /* use count for selection */
 113         int nh_seqcount;        /* heuristic */
 114 } nfsheur[NUM_HEURISTIC];
 115
 116
 117 /*
 118  * Heuristic to detect sequential operation.
 119  */
 120 static struct nfsheur *
 121 nfsrv_sequential_heuristic(struct uio *uio, struct vnode *vp)
 122 {
 123         struct nfsheur *nh;
 124         int hi, try;
 125
 126         /* Locate best candidate. */
 127         try = 32;
 128         hi = ((int)(vm_offset_t)vp / sizeof(struct vnode)) % NUM_HEURISTIC;
 129         nh = &nfsheur[hi];
 130         while (try--) {
 131                 if (nfsheur[hi].nh_vp == vp) {
 132                         nh = &nfsheur[hi];
 133                         break;
 134                 }
 135                 if (nfsheur[hi].nh_use > 0)
 136                         --nfsheur[hi].nh_use;
 137                 hi = (hi + 1) % NUM_HEURISTIC;
 138                 if (nfsheur[hi].nh_use < nh->nh_use)
 139                         nh = &nfsheur[hi];
 140         }
 141
 142         /* Initialize hint if this is a new file. */
 143         if (nh->nh_vp != vp) {
 144                 nh->nh_vp = vp;
 145                 nh->nh_nextoff = uio->uio_offset;
 146                 nh->nh_use = NHUSE_INIT;
 147                 if (uio->uio_offset == 0)
 148                         nh->nh_seqcount = 4;
 149                 else
 150                         nh->nh_seqcount = 1;
 151         }
 152
 153         /* Calculate heuristic. */
 154         if ((uio->uio_offset == 0 && nh->nh_seqcount > 0) ||
 155             uio->uio_offset == nh->nh_nextoff) {
 156                 /* See comments in vfs_vnops.c:sequential_heuristic(). */
 157                 nh->nh_seqcount += howmany(uio->uio_resid, 16384);
 158                 if (nh->nh_seqcount > IO_SEQMAX)
 159                         nh->nh_seqcount = IO_SEQMAX;
 160         } else if (qabs(uio->uio_offset - nh->nh_nextoff) <= MAX_REORDERED_RPC *
 161             imax(vp->v_mount->mnt_stat.f_iosize, uio->uio_resid)) {
 162                 /* Probably a reordered RPC, leave seqcount alone. */
 163         } else if (nh->nh_seqcount > 1) {
 164                 nh->nh_seqcount /= 2;
 165         } else {
 166                 nh->nh_seqcount = 0;
 167         }
 168         nh->nh_use += NHUSE_INC;
 169         if (nh->nh_use > NHUSE_MAX)
 170                 nh->nh_use = NHUSE_MAX;
 171         return (nh);
 172 }
 173
 174 /*
 175  * Get attributes into nfsvattr structure.
 176  */
 177 int
 178 nfsvno_getattr(struct vnode *vp, struct nfsvattr *nvap, struct ucred *cred,
 179     struct thread *p, int vpislocked)
 180 {
 181         int error, lockedit = 0;
 182
 183         if (vpislocked == 0) {
 184                 /*
 185                  * When vpislocked == 0, the vnode is either exclusively
 186                  * locked by this thread or not locked by this thread.
 187                  * As such, shared lock it, if not exclusively locked.
 188                  */
 189                 if (NFSVOPISLOCKED(vp) != LK_EXCLUSIVE) {
 190                         lockedit = 1;
 191                         NFSVOPLOCK(vp, LK_SHARED | LK_RETRY);
 192                 }
 193         }
 194         error = VOP_GETATTR(vp, &nvap->na_vattr, cred);
 195         if (lockedit != 0)
 196                 NFSVOPUNLOCK(vp, 0);
 197
 198         NFSEXITCODE(error);
 199         return (error);
 200 }
 201
 202 /*
 203  * Get a file handle for a vnode.
 204  */
 205 int
 206 nfsvno_getfh(struct vnode *vp, fhandle_t *fhp, struct thread *p)
 207 {
 208         int error;
 209
 210         NFSBZERO((caddr_t)fhp, sizeof(fhandle_t));
 211         fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid;
 212         error = VOP_VPTOFH(vp, &fhp->fh_fid);
 213
 214         NFSEXITCODE(error);
 215         return (error);
 216 }
 217
 218 /*
 219  * Perform access checking for vnodes obtained from file handles that would
 220  * refer to files already opened by a Unix client. You cannot just use
 221  * vn_writechk() and VOP_ACCESSX() for two reasons.
 222  * 1 - You must check for exported rdonly as well as MNT_RDONLY for the write
 223  *     case.
 224  * 2 - The owner is to be given access irrespective of mode bits for some
 225  *     operations, so that processes that chmod after opening a file don't
 226  *     break.
 227  */
 228 int
 229 nfsvno_accchk(struct vnode *vp, accmode_t accmode, struct ucred *cred,
 230     struct nfsexstuff *exp, struct thread *p, int override, int vpislocked,
 231     u_int32_t *supportedtypep)
 232 {
 233         struct vattr vattr;
 234         int error = 0, getret = 0;
 235
 236         if (vpislocked == 0) {
 237                 if (NFSVOPLOCK(vp, LK_SHARED) != 0) {
 238                         error = EPERM;
 239                         goto out;
 240                 }
 241         }
 242         if (accmode & VWRITE) {
 243                 /* Just vn_writechk() changed to check rdonly */
 244                 /*
 245                  * Disallow write attempts on read-only file systems;
 246                  * unless the file is a socket or a block or character
 247                  * device resident on the file system.
 248                  */
 249                 if (NFSVNO_EXRDONLY(exp) ||
 250                     (vp->v_mount->mnt_flag & MNT_RDONLY)) {
 251                         switch (vp->v_type) {
 252                         case VREG:
 253                         case VDIR:
 254                         case VLNK:
 255                                 error = EROFS;
 256                         default:
 257                                 break;
 258                         }
 259                 }
 260                 /*
 261                  * If there's shared text associated with
 262                  * the inode, try to free it up once.  If
 263                  * we fail, we can't allow writing.
 264                  */
 265                 if (VOP_IS_TEXT(vp) && error == 0)
 266                         error = ETXTBSY;
 267         }
 268         if (error != 0) {
 269                 if (vpislocked == 0)
 270                         NFSVOPUNLOCK(vp, 0);
 271                 goto out;
 272         }
 273
 274         /*
 275          * Should the override still be applied when ACLs are enabled?
 276          */
 277         error = VOP_ACCESSX(vp, accmode, cred, p);
 278         if (error != 0 && (accmode & (VDELETE | VDELETE_CHILD))) {
 279                 /*
 280                  * Try again with VEXPLICIT_DENY, to see if the test for
 281                  * deletion is supported.
 282                  */
 283                 error = VOP_ACCESSX(vp, accmode | VEXPLICIT_DENY, cred, p);
 284                 if (error == 0) {
 285                         if (vp->v_type == VDIR) {
 286                                 accmode &= ~(VDELETE | VDELETE_CHILD);
 287                                 accmode |= VWRITE;
 288                                 error = VOP_ACCESSX(vp, accmode, cred, p);
 289                         } else if (supportedtypep != NULL) {
 290                                 *supportedtypep &= ~NFSACCESS_DELETE;
 291                         }
 292                 }
 293         }
 294
 295         /*
 296          * Allow certain operations for the owner (reads and writes
 297          * on files that are already open).
 298          */
 299         if (override != NFSACCCHK_NOOVERRIDE &&
 300             (error == EPERM || error == EACCES)) {
 301                 if (cred->cr_uid == 0 && (override & NFSACCCHK_ALLOWROOT))
 302                         error = 0;
 303                 else if (override & NFSACCCHK_ALLOWOWNER) {
 304                         getret = VOP_GETATTR(vp, &vattr, cred);
 305                         if (getret == 0 && cred->cr_uid == vattr.va_uid)
 306                                 error = 0;
 307                 }
 308         }
 309         if (vpislocked == 0)
 310                 NFSVOPUNLOCK(vp, 0);
 311
 312 out:
 313         NFSEXITCODE(error);
 314         return (error);
 315 }
 316
 317 /*
 318  * Set attribute(s) vnop.
 319  */
 320 int
 321 nfsvno_setattr(struct vnode *vp, struct nfsvattr *nvap, struct ucred *cred,
 322     struct thread *p, struct nfsexstuff *exp)
 323 {
 324         int error;
 325
 326         error = VOP_SETATTR(vp, &nvap->na_vattr, cred);
 327         NFSEXITCODE(error);
 328         return (error);
 329 }
 330
 331 /*
 332  * Set up nameidata for a lookup() call and do it.
 333  */
 334 int
 335 nfsvno_namei(struct nfsrv_descript *nd, struct nameidata *ndp,
 336     struct vnode *dp, int islocked, struct nfsexstuff *exp, struct thread *p,
 337     struct vnode **retdirp)
 338 {
 339         struct componentname *cnp = &ndp->ni_cnd;
 340         int i;
 341         struct iovec aiov;
 342         struct uio auio;
 343         int lockleaf = (cnp->cn_flags & LOCKLEAF) != 0, linklen;
 344         int error = 0, crossmnt;
 345         char *cp;
 346
 347         *retdirp = NULL;
 348         cnp->cn_nameptr = cnp->cn_pnbuf;
 349         ndp->ni_strictrelative = 0;
 350         /*
 351          * Extract and set starting directory.
 352          */
 353         if (dp->v_type != VDIR) {
 354                 if (islocked)
 355                         vput(dp);
 356                 else
 357                         vrele(dp);
 358                 nfsvno_relpathbuf(ndp);
 359                 error = ENOTDIR;
 360                 goto out1;
 361         }
 362         if (islocked)
 363                 NFSVOPUNLOCK(dp, 0);
 364         VREF(dp);
 365         *retdirp = dp;
 366         if (NFSVNO_EXRDONLY(exp))
 367                 cnp->cn_flags |= RDONLY;
 368         ndp->ni_segflg = UIO_SYSSPACE;
 369         crossmnt = 1;
 370
 371         if (nd->nd_flag & ND_PUBLOOKUP) {
 372                 ndp->ni_loopcnt = 0;
 373                 if (cnp->cn_pnbuf[0] == '/') {
 374                         vrele(dp);
 375                         /*
 376                          * Check for degenerate pathnames here, since lookup()
 377                          * panics on them.
 378                          */
 379                         for (i = 1; i < ndp->ni_pathlen; i++)
 380                                 if (cnp->cn_pnbuf[i] != '/')
 381                                         break;
 382                         if (i == ndp->ni_pathlen) {
 383                                 error = NFSERR_ACCES;
 384                                 goto out;
 385                         }
 386                         dp = rootvnode;
 387                         VREF(dp);
 388                 }
 389         } else if ((nfsrv_enable_crossmntpt == 0 && NFSVNO_EXPORTED(exp)) ||
 390             (nd->nd_flag & ND_NFSV4) == 0) {
 391                 /*
 392                  * Only cross mount points for NFSv4 when doing a
 393                  * mount while traversing the file system above
 394                  * the mount point, unless nfsrv_enable_crossmntpt is set.
 395                  */
 396                 cnp->cn_flags |= NOCROSSMOUNT;
 397                 crossmnt = 0;
 398         }
 399
 400         /*
 401          * Initialize for scan, set ni_startdir and bump ref on dp again
 402          * because lookup() will dereference ni_startdir.
 403          */
 404
 405         cnp->cn_thread = p;
 406         ndp->ni_startdir = dp;
 407         ndp->ni_rootdir = rootvnode;
 408         ndp->ni_topdir = NULL;
 409
 410         if (!lockleaf)
 411                 cnp->cn_flags |= LOCKLEAF;
 412         for (;;) {
 413                 cnp->cn_nameptr = cnp->cn_pnbuf;
 414                 /*
 415                  * Call lookup() to do the real work.  If an error occurs,
 416                  * ndp->ni_vp and ni_dvp are left uninitialized or NULL and
 417                  * we do not have to dereference anything before returning.
 418                  * In either case ni_startdir will be dereferenced and NULLed
 419                  * out.
 420                  */
 421                 error = lookup(ndp);
 422                 if (error)
 423                         break;
 424
 425                 /*
 426                  * Check for encountering a symbolic link.  Trivial
 427                  * termination occurs if no symlink encountered.
 428                  */
 429                 if ((cnp->cn_flags & ISSYMLINK) == 0) {
 430                         if ((cnp->cn_flags & (SAVENAME | SAVESTART)) == 0)
 431                                 nfsvno_relpathbuf(ndp);
 432                         if (ndp->ni_vp && !lockleaf)
 433                                 NFSVOPUNLOCK(ndp->ni_vp, 0);
 434                         break;
 435                 }
 436
 437                 /*
 438                  * Validate symlink
 439                  */
 440                 if ((cnp->cn_flags & LOCKPARENT) && ndp->ni_pathlen == 1)
 441                         NFSVOPUNLOCK(ndp->ni_dvp, 0);
 442                 if (!(nd->nd_flag & ND_PUBLOOKUP)) {
 443                         error = EINVAL;
 444                         goto badlink2;
 445                 }
 446
 447                 if (ndp->ni_loopcnt++ >= MAXSYMLINKS) {
 448                         error = ELOOP;
 449                         goto badlink2;
 450                 }
 451                 if (ndp->ni_pathlen > 1)
 452                         cp = uma_zalloc(namei_zone, M_WAITOK);
 453                 else
 454                         cp = cnp->cn_pnbuf;
 455                 aiov.iov_base = cp;
 456                 aiov.iov_len = MAXPATHLEN;
 457                 auio.uio_iov = &aiov;
 458                 auio.uio_iovcnt = 1;
 459                 auio.uio_offset = 0;
 460                 auio.uio_rw = UIO_READ;
 461                 auio.uio_segflg = UIO_SYSSPACE;
 462                 auio.uio_td = NULL;
 463                 auio.uio_resid = MAXPATHLEN;
 464                 error = VOP_READLINK(ndp->ni_vp, &auio, cnp->cn_cred);
 465                 if (error) {
 466                 badlink1:
 467                         if (ndp->ni_pathlen > 1)
 468                                 uma_zfree(namei_zone, cp);
 469                 badlink2:
 470                         vrele(ndp->ni_dvp);
 471                         vput(ndp->ni_vp);
 472                         break;
 473                 }
 474                 linklen = MAXPATHLEN - auio.uio_resid;
 475                 if (linklen == 0) {
 476                         error = ENOENT;
 477                         goto badlink1;
 478                 }
 479                 if (linklen + ndp->ni_pathlen >= MAXPATHLEN) {
 480                         error = ENAMETOOLONG;
 481                         goto badlink1;
 482                 }
 483
 484                 /*
 485                  * Adjust or replace path
 486                  */
 487                 if (ndp->ni_pathlen > 1) {
 488                         NFSBCOPY(ndp->ni_next, cp + linklen, ndp->ni_pathlen);
 489                         uma_zfree(namei_zone, cnp->cn_pnbuf);
 490                         cnp->cn_pnbuf = cp;
 491                 } else
 492                         cnp->cn_pnbuf[linklen] = '\0';
 493                 ndp->ni_pathlen += linklen;
 494
 495                 /*
 496                  * Cleanup refs for next loop and check if root directory
 497                  * should replace current directory.  Normally ni_dvp
 498                  * becomes the new base directory and is cleaned up when
 499                  * we loop.  Explicitly null pointers after invalidation
 500                  * to clarify operation.
 501                  */
 502                 vput(ndp->ni_vp);
 503                 ndp->ni_vp = NULL;
 504
 505                 if (cnp->cn_pnbuf[0] == '/') {
 506                         vrele(ndp->ni_dvp);
 507                         ndp->ni_dvp = ndp->ni_rootdir;
 508                         VREF(ndp->ni_dvp);
 509                 }
 510                 ndp->ni_startdir = ndp->ni_dvp;
 511                 ndp->ni_dvp = NULL;
 512         }
 513         if (!lockleaf)
 514                 cnp->cn_flags &= ~LOCKLEAF;
 515
 516 out:
 517         if (error) {
 518                 nfsvno_relpathbuf(ndp);
 519                 ndp->ni_vp = NULL;
 520                 ndp->ni_dvp = NULL;
 521                 ndp->ni_startdir = NULL;
 522         } else if ((ndp->ni_cnd.cn_flags & (WANTPARENT|LOCKPARENT)) == 0) {
 523                 ndp->ni_dvp = NULL;
 524         }
 525
 526 out1:
 527         NFSEXITCODE2(error, nd);
 528         return (error);
 529 }
 530
 531 /*
 532  * Set up a pathname buffer and return a pointer to it and, optionally
 533  * set a hash pointer.
 534  */
 535 void
 536 nfsvno_setpathbuf(struct nameidata *ndp, char **bufpp, u_long **hashpp)
 537 {
 538         struct componentname *cnp = &ndp->ni_cnd;
 539
 540         cnp->cn_flags |= (NOMACCHECK | HASBUF);
 541         cnp->cn_pnbuf = uma_zalloc(namei_zone, M_WAITOK);
 542         if (hashpp != NULL)
 543                 *hashpp = NULL;
 544         *bufpp = cnp->cn_pnbuf;
 545 }
 546
 547 /*
 548  * Release the above path buffer, if not released by nfsvno_namei().
 549  */
 550 void
 551 nfsvno_relpathbuf(struct nameidata *ndp)
 552 {
 553
 554         if ((ndp->ni_cnd.cn_flags & HASBUF) == 0)
 555                 panic("nfsrelpath");
 556         uma_zfree(namei_zone, ndp->ni_cnd.cn_pnbuf);
 557         ndp->ni_cnd.cn_flags &= ~HASBUF;
 558 }
 559
 560 /*
 561  * Readlink vnode op into an mbuf list.
 562  */
 563 int
 564 nfsvno_readlink(struct vnode *vp, struct ucred *cred, struct thread *p,
 565     struct mbuf **mpp, struct mbuf **mpendp, int *lenp)
 566 {
 567         struct iovec iv[(NFS_MAXPATHLEN+MLEN-1)/MLEN];
 568         struct iovec *ivp = iv;
 569         struct uio io, *uiop = &io;
 570         struct mbuf *mp, *mp2 = NULL, *mp3 = NULL;
 571         int i, len, tlen, error = 0;
 572
 573         len = 0;
 574         i = 0;
 575         while (len < NFS_MAXPATHLEN) {
 576                 NFSMGET(mp);
 577                 MCLGET(mp, M_WAITOK);
 578                 mp->m_len = NFSMSIZ(mp);
 579                 if (len == 0) {
 580                         mp3 = mp2 = mp;
 581                 } else {
 582                         mp2->m_next = mp;
 583                         mp2 = mp;
 584                 }
 585                 if ((len + mp->m_len) > NFS_MAXPATHLEN) {
 586                         mp->m_len = NFS_MAXPATHLEN - len;
 587                         len = NFS_MAXPATHLEN;
 588                 } else {
 589                         len += mp->m_len;
 590                 }
 591                 ivp->iov_base = mtod(mp, caddr_t);
 592                 ivp->iov_len = mp->m_len;
 593                 i++;
 594                 ivp++;
 595         }
 596         uiop->uio_iov = iv;
 597         uiop->uio_iovcnt = i;
 598         uiop->uio_offset = 0;
 599         uiop->uio_resid = len;
 600         uiop->uio_rw = UIO_READ;
 601         uiop->uio_segflg = UIO_SYSSPACE;
 602         uiop->uio_td = NULL;
 603         error = VOP_READLINK(vp, uiop, cred);
 604         if (error) {
 605                 m_freem(mp3);
 606                 *lenp = 0;
 607                 goto out;
 608         }
 609         if (uiop->uio_resid > 0) {
 610                 len -= uiop->uio_resid;
 611                 tlen = NFSM_RNDUP(len);
 612                 nfsrv_adj(mp3, NFS_MAXPATHLEN - tlen, tlen - len);
 613         }
 614         *lenp = len;
 615         *mpp = mp3;
 616         *mpendp = mp;
 617
 618 out:
 619         NFSEXITCODE(error);
 620         return (error);
 621 }
 622
 623 /*
 624  * Read vnode op call into mbuf list.
 625  */
 626 int
 627 nfsvno_read(struct vnode *vp, off_t off, int cnt, struct ucred *cred,
 628     struct thread *p, struct mbuf **mpp, struct mbuf **mpendp)
 629 {
 630         struct mbuf *m;
 631         int i;
 632         struct iovec *iv;
 633         struct iovec *iv2;
 634         int error = 0, len, left, siz, tlen, ioflag = 0;
 635         struct mbuf *m2 = NULL, *m3;
 636         struct uio io, *uiop = &io;
 637         struct nfsheur *nh;
 638
 639         len = left = NFSM_RNDUP(cnt);
 640         m3 = NULL;
 641         /*
 642          * Generate the mbuf list with the uio_iov ref. to it.
 643          */
 644         i = 0;
 645         while (left > 0) {
 646                 NFSMGET(m);
 647                 MCLGET(m, M_WAITOK);
 648                 m->m_len = 0;
 649                 siz = min(M_TRAILINGSPACE(m), left);
 650                 left -= siz;
 651                 i++;
 652                 if (m3)
 653                         m2->m_next = m;
 654                 else
 655                         m3 = m;
 656                 m2 = m;
 657         }
 658         MALLOC(iv, struct iovec *, i * sizeof (struct iovec),
 659             M_TEMP, M_WAITOK);
 660         uiop->uio_iov = iv2 = iv;
 661         m = m3;
 662         left = len;
 663         i = 0;
 664         while (left > 0) {
 665                 if (m == NULL)
 666                         panic("nfsvno_read iov");
 667                 siz = min(M_TRAILINGSPACE(m), left);
 668                 if (siz > 0) {
 669                         iv->iov_base = mtod(m, caddr_t) + m->m_len;
 670                         iv->iov_len = siz;
 671                         m->m_len += siz;
 672                         left -= siz;
 673                         iv++;
 674                         i++;
 675                 }
 676                 m = m->m_next;
 677         }
 678         uiop->uio_iovcnt = i;
 679         uiop->uio_offset = off;
 680         uiop->uio_resid = len;
 681         uiop->uio_rw = UIO_READ;
 682         uiop->uio_segflg = UIO_SYSSPACE;
 683         uiop->uio_td = NULL;
 684         nh = nfsrv_sequential_heuristic(uiop, vp);
 685         ioflag |= nh->nh_seqcount << IO_SEQSHIFT;
 686         error = VOP_READ(vp, uiop, IO_NODELOCKED | ioflag, cred);
 687         FREE((caddr_t)iv2, M_TEMP);
 688         if (error) {
 689                 m_freem(m3);
 690                 *mpp = NULL;
 691                 goto out;
 692         }
 693         nh->nh_nextoff = uiop->uio_offset;
 694         tlen = len - uiop->uio_resid;
 695         cnt = cnt < tlen ? cnt : tlen;
 696         tlen = NFSM_RNDUP(cnt);
 697         if (tlen == 0) {
 698                 m_freem(m3);
 699                 m3 = NULL;
 700         } else if (len != tlen || tlen != cnt)
 701                 nfsrv_adj(m3, len - tlen, tlen - cnt);
 702         *mpp = m3;
 703         *mpendp = m2;
 704
 705 out:
 706         NFSEXITCODE(error);
 707         return (error);
 708 }
 709
 710 /*
 711  * Write vnode op from an mbuf list.
 712  */
 713 int
 714 nfsvno_write(struct vnode *vp, off_t off, int retlen, int cnt, int stable,
 715     struct mbuf *mp, char *cp, struct ucred *cred, struct thread *p)
 716 {
 717         struct iovec *ivp;
 718         int i, len;
 719         struct iovec *iv;
 720         int ioflags, error;
 721         struct uio io, *uiop = &io;
 722         struct nfsheur *nh;
 723
 724         MALLOC(ivp, struct iovec *, cnt * sizeof (struct iovec), M_TEMP,
 725             M_WAITOK);
 726         uiop->uio_iov = iv = ivp;
 727         uiop->uio_iovcnt = cnt;
 728         i = mtod(mp, caddr_t) + mp->m_len - cp;
 729         len = retlen;
 730         while (len > 0) {
 731                 if (mp == NULL)
 732                         panic("nfsvno_write");
 733                 if (i > 0) {
 734                         i = min(i, len);
 735                         ivp->iov_base = cp;
 736                         ivp->iov_len = i;
 737                         ivp++;
 738                         len -= i;
 739                 }
 740                 mp = mp->m_next;
 741                 if (mp) {
 742                         i = mp->m_len;
 743                         cp = mtod(mp, caddr_t);
 744                 }
 745         }
 746
 747         if (stable == NFSWRITE_UNSTABLE)
 748                 ioflags = IO_NODELOCKED;
 749         else
 750                 ioflags = (IO_SYNC | IO_NODELOCKED);
 751         uiop->uio_resid = retlen;
 752         uiop->uio_rw = UIO_WRITE;
 753         uiop->uio_segflg = UIO_SYSSPACE;
 754         NFSUIOPROC(uiop, p);
 755         uiop->uio_offset = off;
 756         nh = nfsrv_sequential_heuristic(uiop, vp);
 757         ioflags |= nh->nh_seqcount << IO_SEQSHIFT;
 758         error = VOP_WRITE(vp, uiop, ioflags, cred);
 759         if (error == 0)
 760                 nh->nh_nextoff = uiop->uio_offset;
 761         FREE((caddr_t)iv, M_TEMP);
 762
 763         NFSEXITCODE(error);
 764         return (error);
 765 }
 766
 767 /*
 768  * Common code for creating a regular file (plus special files for V2).
 769  */
 770 int
 771 nfsvno_createsub(struct nfsrv_descript *nd, struct nameidata *ndp,
 772     struct vnode **vpp, struct nfsvattr *nvap, int *exclusive_flagp,
 773     int32_t *cverf, NFSDEV_T rdev, struct thread *p, struct nfsexstuff *exp)
 774 {
 775         u_quad_t tempsize;
 776         int error;
 777
 778         error = nd->nd_repstat;
 779         if (!error && ndp->ni_vp == NULL) {
 780                 if (nvap->na_type == VREG || nvap->na_type == VSOCK) {
 781                         vrele(ndp->ni_startdir);
 782                         error = VOP_CREATE(ndp->ni_dvp,
 783                             &ndp->ni_vp, &ndp->ni_cnd, &nvap->na_vattr);
 784                         vput(ndp->ni_dvp);
 785                         nfsvno_relpathbuf(ndp);
 786                         if (!error) {
 787                                 if (*exclusive_flagp) {
 788                                         *exclusive_flagp = 0;
 789                                         NFSVNO_ATTRINIT(nvap);
 790                                         nvap->na_atime.tv_sec = cverf[0];
 791                                         nvap->na_atime.tv_nsec = cverf[1];
 792                                         error = VOP_SETATTR(ndp->ni_vp,
 793                                             &nvap->na_vattr, nd->nd_cred);
 794                                 }
 795                         }
 796                 /*
 797                  * NFS V2 Only. nfsrvd_mknod() does this for V3.
 798                  * (This implies, just get out on an error.)
 799                  */
 800                 } else if (nvap->na_type == VCHR || nvap->na_type == VBLK ||
 801                         nvap->na_type == VFIFO) {
 802                         if (nvap->na_type == VCHR && rdev == 0xffffffff)
 803                                 nvap->na_type = VFIFO;
 804                         if (nvap->na_type != VFIFO &&
 805                             (error = priv_check_cred(nd->nd_cred,
 806                              PRIV_VFS_MKNOD_DEV, 0))) {
 807                                 vrele(ndp->ni_startdir);
 808                                 nfsvno_relpathbuf(ndp);
 809                                 vput(ndp->ni_dvp);
 810                                 goto out;
 811                         }
 812                         nvap->na_rdev = rdev;
 813                         error = VOP_MKNOD(ndp->ni_dvp, &ndp->ni_vp,
 814                             &ndp->ni_cnd, &nvap->na_vattr);
 815                         vput(ndp->ni_dvp);
 816                         nfsvno_relpathbuf(ndp);
 817                         vrele(ndp->ni_startdir);
 818                         if (error)
 819                                 goto out;
 820                 } else {
 821                         vrele(ndp->ni_startdir);
 822                         nfsvno_relpathbuf(ndp);
 823                         vput(ndp->ni_dvp);
 824                         error = ENXIO;
 825                         goto out;
 826                 }
 827                 *vpp = ndp->ni_vp;
 828         } else {
 829                 /*
 830                  * Handle cases where error is already set and/or
 831                  * the file exists.
 832                  * 1 - clean up the lookup
 833                  * 2 - iff !error and na_size set, truncate it
 834                  */
 835                 vrele(ndp->ni_startdir);
 836                 nfsvno_relpathbuf(ndp);
 837                 *vpp = ndp->ni_vp;
 838                 if (ndp->ni_dvp == *vpp)
 839                         vrele(ndp->ni_dvp);
 840                 else
 841                         vput(ndp->ni_dvp);
 842                 if (!error && nvap->na_size != VNOVAL) {
 843                         error = nfsvno_accchk(*vpp, VWRITE,
 844                             nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
 845                             NFSACCCHK_VPISLOCKED, NULL);
 846                         if (!error) {
 847                                 tempsize = nvap->na_size;
 848                                 NFSVNO_ATTRINIT(nvap);
 849                                 nvap->na_size = tempsize;
 850                                 error = VOP_SETATTR(*vpp,
 851                                     &nvap->na_vattr, nd->nd_cred);
 852                         }
 853                 }
 854                 if (error)
 855                         vput(*vpp);
 856         }
 857
 858 out:
 859         NFSEXITCODE(error);
 860         return (error);
 861 }
 862
 863 /*
 864  * Do a mknod vnode op.
 865  */
 866 int
 867 nfsvno_mknod(struct nameidata *ndp, struct nfsvattr *nvap, struct ucred *cred,
 868     struct thread *p)
 869 {
 870         int error = 0;
 871         enum vtype vtyp;
 872
 873         vtyp = nvap->na_type;
 874         /*
 875          * Iff doesn't exist, create it.
 876          */
 877         if (ndp->ni_vp) {
 878                 vrele(ndp->ni_startdir);
 879                 nfsvno_relpathbuf(ndp);
 880                 vput(ndp->ni_dvp);
 881                 vrele(ndp->ni_vp);
 882                 error = EEXIST;
 883                 goto out;
 884         }
 885         if (vtyp != VCHR && vtyp != VBLK && vtyp != VSOCK && vtyp != VFIFO) {
 886                 vrele(ndp->ni_startdir);
 887                 nfsvno_relpathbuf(ndp);
 888                 vput(ndp->ni_dvp);
 889                 error = NFSERR_BADTYPE;
 890                 goto out;
 891         }
 892         if (vtyp == VSOCK) {
 893                 vrele(ndp->ni_startdir);
 894                 error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp,
 895                     &ndp->ni_cnd, &nvap->na_vattr);
 896                 vput(ndp->ni_dvp);
 897                 nfsvno_relpathbuf(ndp);
 898         } else {
 899                 if (nvap->na_type != VFIFO &&
 900                     (error = priv_check_cred(cred, PRIV_VFS_MKNOD_DEV, 0))) {
 901                         vrele(ndp->ni_startdir);
 902                         nfsvno_relpathbuf(ndp);
 903                         vput(ndp->ni_dvp);
 904                         goto out;
 905                 }
 906                 error = VOP_MKNOD(ndp->ni_dvp, &ndp->ni_vp,
 907                     &ndp->ni_cnd, &nvap->na_vattr);
 908                 vput(ndp->ni_dvp);
 909                 nfsvno_relpathbuf(ndp);
 910                 vrele(ndp->ni_startdir);
 911                 /*
 912                  * Since VOP_MKNOD returns the ni_vp, I can't
 913                  * see any reason to do the lookup.
 914                  */
 915         }
 916
 917 out:
 918         NFSEXITCODE(error);
 919         return (error);
 920 }
 921
 922 /*
 923  * Mkdir vnode op.
 924  */
 925 int
 926 nfsvno_mkdir(struct nameidata *ndp, struct nfsvattr *nvap, uid_t saved_uid,
 927     struct ucred *cred, struct thread *p, struct nfsexstuff *exp)
 928 {
 929         int error = 0;
 930
 931         if (ndp->ni_vp != NULL) {
 932                 if (ndp->ni_dvp == ndp->ni_vp)
 933                         vrele(ndp->ni_dvp);
 934                 else
 935                         vput(ndp->ni_dvp);
 936                 vrele(ndp->ni_vp);
 937                 nfsvno_relpathbuf(ndp);
 938                 error = EEXIST;
 939                 goto out;
 940         }
 941         error = VOP_MKDIR(ndp->ni_dvp, &ndp->ni_vp, &ndp->ni_cnd,
 942             &nvap->na_vattr);
 943         vput(ndp->ni_dvp);
 944         nfsvno_relpathbuf(ndp);
 945
 946 out:
 947         NFSEXITCODE(error);
 948         return (error);
 949 }
 950
 951 /*
 952  * symlink vnode op.
 953  */
 954 int
 955 nfsvno_symlink(struct nameidata *ndp, struct nfsvattr *nvap, char *pathcp,
 956     int pathlen, int not_v2, uid_t saved_uid, struct ucred *cred, struct thread *p,
 957     struct nfsexstuff *exp)
 958 {
 959         int error = 0;
 960
 961         if (ndp->ni_vp) {
 962                 vrele(ndp->ni_startdir);
 963                 nfsvno_relpathbuf(ndp);
 964                 if (ndp->ni_dvp == ndp->ni_vp)
 965                         vrele(ndp->ni_dvp);
 966                 else
 967                         vput(ndp->ni_dvp);
 968                 vrele(ndp->ni_vp);
 969                 error = EEXIST;
 970                 goto out;
 971         }
 972
 973         error = VOP_SYMLINK(ndp->ni_dvp, &ndp->ni_vp, &ndp->ni_cnd,
 974             &nvap->na_vattr, pathcp);
 975         vput(ndp->ni_dvp);
 976         vrele(ndp->ni_startdir);
 977         nfsvno_relpathbuf(ndp);
 978         /*
 979          * Although FreeBSD still had the lookup code in
 980          * it for 7/current, there doesn't seem to be any
 981          * point, since VOP_SYMLINK() returns the ni_vp.
 982          * Just vput it for v2.
 983          */
 984         if (!not_v2 && !error)
 985                 vput(ndp->ni_vp);
 986
 987 out:
 988         NFSEXITCODE(error);
 989         return (error);
 990 }
 991
 992 /*
 993  * Parse symbolic link arguments.
 994  * This function has an ugly side effect. It will MALLOC() an area for
 995  * the symlink and set iov_base to point to it, only if it succeeds.
 996  * So, if it returns with uiop->uio_iov->iov_base != NULL, that must
 997  * be FREE'd later.
 998  */
 999 int
1000 nfsvno_getsymlink(struct nfsrv_descript *nd, struct nfsvattr *nvap,
1001     struct thread *p, char **pathcpp, int *lenp)
1002 {
1003         u_int32_t *tl;
1004         char *pathcp = NULL;
1005         int error = 0, len;
1006         struct nfsv2_sattr *sp;
1007
1008         *pathcpp = NULL;
1009         *lenp = 0;
1010         if ((nd->nd_flag & ND_NFSV3) &&
1011             (error = nfsrv_sattr(nd, nvap, NULL, NULL, p)))
1012                 goto nfsmout;
1013         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
1014         len = fxdr_unsigned(int, *tl);
1015         if (len > NFS_MAXPATHLEN || len <= 0) {
1016                 error = EBADRPC;
1017                 goto nfsmout;
1018         }
1019         MALLOC(pathcp, caddr_t, len + 1, M_TEMP, M_WAITOK);
1020         error = nfsrv_mtostr(nd, pathcp, len);
1021         if (error)
1022                 goto nfsmout;
1023         if (nd->nd_flag & ND_NFSV2) {
1024                 NFSM_DISSECT(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
1025                 nvap->na_mode = fxdr_unsigned(u_int16_t, sp->sa_mode);
1026         }
1027         *pathcpp = pathcp;
1028         *lenp = len;
1029         NFSEXITCODE2(0, nd);
1030         return (0);
1031 nfsmout:
1032         if (pathcp)
1033                 free(pathcp, M_TEMP);
1034         NFSEXITCODE2(error, nd);
1035         return (error);
1036 }
1037
1038 /*
1039  * Remove a non-directory object.
1040  */
1041 int
1042 nfsvno_removesub(struct nameidata *ndp, int is_v4, struct ucred *cred,
1043     struct thread *p, struct nfsexstuff *exp)
1044 {
1045         struct vnode *vp;
1046         int error = 0;
1047
1048         vp = ndp->ni_vp;
1049         if (vp->v_type == VDIR)
1050                 error = NFSERR_ISDIR;
1051         else if (is_v4)
1052                 error = nfsrv_checkremove(vp, 1, p);
1053         if (!error)
1054                 error = VOP_REMOVE(ndp->ni_dvp, vp, &ndp->ni_cnd);
1055         if (ndp->ni_dvp == vp)
1056                 vrele(ndp->ni_dvp);
1057         else
1058                 vput(ndp->ni_dvp);
1059         vput(vp);
1060         if ((ndp->ni_cnd.cn_flags & SAVENAME) != 0)
1061                 nfsvno_relpathbuf(ndp);
1062         NFSEXITCODE(error);
1063         return (error);
1064 }
1065
1066 /*
1067  * Remove a directory.
1068  */
1069 int
1070 nfsvno_rmdirsub(struct nameidata *ndp, int is_v4, struct ucred *cred,
1071     struct thread *p, struct nfsexstuff *exp)
1072 {
1073         struct vnode *vp;
1074         int error = 0;
1075
1076         vp = ndp->ni_vp;
1077         if (vp->v_type != VDIR) {
1078                 error = ENOTDIR;
1079                 goto out;
1080         }
1081         /*
1082          * No rmdir "." please.
1083          */
1084         if (ndp->ni_dvp == vp) {
1085                 error = EINVAL;
1086                 goto out;
1087         }
1088         /*
1089          * The root of a mounted filesystem cannot be deleted.
1090          */
1091         if (vp->v_vflag & VV_ROOT)
1092                 error = EBUSY;
1093 out:
1094         if (!error)
1095                 error = VOP_RMDIR(ndp->ni_dvp, vp, &ndp->ni_cnd);
1096         if (ndp->ni_dvp == vp)
1097                 vrele(ndp->ni_dvp);
1098         else
1099                 vput(ndp->ni_dvp);
1100         vput(vp);
1101         if ((ndp->ni_cnd.cn_flags & SAVENAME) != 0)
1102                 nfsvno_relpathbuf(ndp);
1103         NFSEXITCODE(error);
1104         return (error);
1105 }
1106
1107 /*
1108  * Rename vnode op.
1109  */
1110 int
1111 nfsvno_rename(struct nameidata *fromndp, struct nameidata *tondp,
1112     u_int32_t ndstat, u_int32_t ndflag, struct ucred *cred, struct thread *p)
1113 {
1114         struct vnode *fvp, *tvp, *tdvp;
1115         int error = 0;
1116
1117         fvp = fromndp->ni_vp;
1118         if (ndstat) {
1119                 vrele(fromndp->ni_dvp);
1120                 vrele(fvp);
1121                 error = ndstat;
1122                 goto out1;
1123         }
1124         tdvp = tondp->ni_dvp;
1125         tvp = tondp->ni_vp;
1126         if (tvp != NULL) {
1127                 if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
1128                         error = (ndflag & ND_NFSV2) ? EISDIR : EEXIST;
1129                         goto out;
1130                 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
1131                         error = (ndflag & ND_NFSV2) ? ENOTDIR : EEXIST;
1132                         goto out;
1133                 }
1134                 if (tvp->v_type == VDIR && tvp->v_mountedhere) {
1135                         error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
1136                         goto out;
1137                 }
1138
1139                 /*
1140                  * A rename to '.' or '..' results in a prematurely
1141                  * unlocked vnode on FreeBSD5, so I'm just going to fail that
1142                  * here.
1143                  */
1144                 if ((tondp->ni_cnd.cn_namelen == 1 &&
1145                      tondp->ni_cnd.cn_nameptr[0] == '.') ||
1146                     (tondp->ni_cnd.cn_namelen == 2 &&
1147                      tondp->ni_cnd.cn_nameptr[0] == '.' &&
1148                      tondp->ni_cnd.cn_nameptr[1] == '.')) {
1149                         error = EINVAL;
1150                         goto out;
1151                 }
1152         }
1153         if (fvp->v_type == VDIR && fvp->v_mountedhere) {
1154                 error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
1155                 goto out;
1156         }
1157         if (fvp->v_mount != tdvp->v_mount) {
1158                 error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
1159                 goto out;
1160         }
1161         if (fvp == tdvp) {
1162                 error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EINVAL;
1163                 goto out;
1164         }
1165         if (fvp == tvp) {
1166                 /*
1167                  * If source and destination are the same, there is nothing to
1168                  * do. Set error to -1 to indicate this.
1169                  */
1170                 error = -1;
1171                 goto out;
1172         }
1173         if (ndflag & ND_NFSV4) {
1174                 if (NFSVOPLOCK(fvp, LK_EXCLUSIVE) == 0) {
1175                         error = nfsrv_checkremove(fvp, 0, p);
1176                         NFSVOPUNLOCK(fvp, 0);
1177                 } else
1178                         error = EPERM;
1179                 if (tvp && !error)
1180                         error = nfsrv_checkremove(tvp, 1, p);
1181         } else {
1182                 /*
1183                  * For NFSv2 and NFSv3, try to get rid of the delegation, so
1184                  * that the NFSv4 client won't be confused by the rename.
1185                  * Since nfsd_recalldelegation() can only be called on an
1186                  * unlocked vnode at this point and fvp is the file that will
1187                  * still exist after the rename, just do fvp.
1188                  */
1189                 nfsd_recalldelegation(fvp, p);
1190         }
1191 out:
1192         if (!error) {
1193                 error = VOP_RENAME(fromndp->ni_dvp, fromndp->ni_vp,
1194                     &fromndp->ni_cnd, tondp->ni_dvp, tondp->ni_vp,
1195                     &tondp->ni_cnd);
1196         } else {
1197                 if (tdvp == tvp)
1198                         vrele(tdvp);
1199                 else
1200                         vput(tdvp);
1201                 if (tvp)
1202                         vput(tvp);
1203                 vrele(fromndp->ni_dvp);
1204                 vrele(fvp);
1205                 if (error == -1)
1206                         error = 0;
1207         }
1208         vrele(tondp->ni_startdir);
1209         nfsvno_relpathbuf(tondp);
1210 out1:
1211         vrele(fromndp->ni_startdir);
1212         nfsvno_relpathbuf(fromndp);
1213         NFSEXITCODE(error);
1214         return (error);
1215 }
1216
1217 /*
1218  * Link vnode op.
1219  */
1220 int
1221 nfsvno_link(struct nameidata *ndp, struct vnode *vp, struct ucred *cred,
1222     struct thread *p, struct nfsexstuff *exp)
1223 {
1224         struct vnode *xp;
1225         int error = 0;
1226
1227         xp = ndp->ni_vp;
1228         if (xp != NULL) {
1229                 error = EEXIST;
1230         } else {
1231                 xp = ndp->ni_dvp;
1232                 if (vp->v_mount != xp->v_mount)
1233                         error = EXDEV;
1234         }
1235         if (!error) {
1236                 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
1237                 if ((vp->v_iflag & VI_DOOMED) == 0)
1238                         error = VOP_LINK(ndp->ni_dvp, vp, &ndp->ni_cnd);
1239                 else
1240                         error = EPERM;
1241                 if (ndp->ni_dvp == vp)
1242                         vrele(ndp->ni_dvp);
1243                 else
1244                         vput(ndp->ni_dvp);
1245                 NFSVOPUNLOCK(vp, 0);
1246         } else {
1247                 if (ndp->ni_dvp == ndp->ni_vp)
1248                         vrele(ndp->ni_dvp);
1249                 else
1250                         vput(ndp->ni_dvp);
1251                 if (ndp->ni_vp)
1252                         vrele(ndp->ni_vp);
1253         }
1254         nfsvno_relpathbuf(ndp);
1255         NFSEXITCODE(error);
1256         return (error);
1257 }
1258
1259 /*
1260  * Do the fsync() appropriate for the commit.
1261  */
1262 int
1263 nfsvno_fsync(struct vnode *vp, u_int64_t off, int cnt, struct ucred *cred,
1264     struct thread *td)
1265 {
1266         int error = 0;
1267
1268         /*
1269          * RFC 1813 3.3.21: if count is 0, a flush from offset to the end of
1270          * file is done.  At this time VOP_FSYNC does not accept offset and
1271          * byte count parameters so call VOP_FSYNC the whole file for now.
1272          * The same is true for NFSv4: RFC 3530 Sec. 14.2.3.
1273          */
1274         if (cnt == 0 || cnt > MAX_COMMIT_COUNT) {
1275                 /*
1276                  * Give up and do the whole thing
1277                  */
1278                 if (vp->v_object &&
1279                    (vp->v_object->flags & OBJ_MIGHTBEDIRTY)) {
1280                         VM_OBJECT_WLOCK(vp->v_object);
1281                         vm_object_page_clean(vp->v_object, 0, 0, OBJPC_SYNC);
1282                         VM_OBJECT_WUNLOCK(vp->v_object);
1283                 }
1284                 error = VOP_FSYNC(vp, MNT_WAIT, td);
1285         } else {
1286                 /*
1287                  * Locate and synchronously write any buffers that fall
1288                  * into the requested range.  Note:  we are assuming that
1289                  * f_iosize is a power of 2.
1290                  */
1291                 int iosize = vp->v_mount->mnt_stat.f_iosize;
1292                 int iomask = iosize - 1;
1293                 struct bufobj *bo;
1294                 daddr_t lblkno;
1295
1296                 /*
1297                  * Align to iosize boundry, super-align to page boundry.
1298                  */
1299                 if (off & iomask) {
1300                         cnt += off & iomask;
1301                         off &= ~(u_quad_t)iomask;
1302                 }
1303                 if (off & PAGE_MASK) {
1304                         cnt += off & PAGE_MASK;
1305                         off &= ~(u_quad_t)PAGE_MASK;
1306                 }
1307                 lblkno = off / iosize;
1308
1309                 if (vp->v_object &&
1310                    (vp->v_object->flags & OBJ_MIGHTBEDIRTY)) {
1311                         VM_OBJECT_WLOCK(vp->v_object);
1312                         vm_object_page_clean(vp->v_object, off, off + cnt,
1313                             OBJPC_SYNC);
1314                         VM_OBJECT_WUNLOCK(vp->v_object);
1315                 }
1316
1317                 bo = &vp->v_bufobj;
1318                 BO_LOCK(bo);
1319                 while (cnt > 0) {
1320                         struct buf *bp;
1321
1322                         /*
1323                          * If we have a buffer and it is marked B_DELWRI we
1324                          * have to lock and write it.  Otherwise the prior
1325                          * write is assumed to have already been committed.
1326                          *
1327                          * gbincore() can return invalid buffers now so we
1328                          * have to check that bit as well (though B_DELWRI
1329                          * should not be set if B_INVAL is set there could be
1330                          * a race here since we haven't locked the buffer).
1331                          */
1332                         if ((bp = gbincore(&vp->v_bufobj, lblkno)) != NULL) {
1333                                 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_SLEEPFAIL |
1334                                     LK_INTERLOCK, BO_LOCKPTR(bo)) == ENOLCK) {
1335                                         BO_LOCK(bo);
1336                                         continue; /* retry */
1337                                 }
1338                                 if ((bp->b_flags & (B_DELWRI|B_INVAL)) ==
1339                                     B_DELWRI) {
1340                                         bremfree(bp);
1341                                         bp->b_flags &= ~B_ASYNC;
1342                                         bwrite(bp);
1343                                         ++nfs_commit_miss;
1344                                 } else
1345                                         BUF_UNLOCK(bp);
1346                                 BO_LOCK(bo);
1347                         }
1348                         ++nfs_commit_blks;
1349                         if (cnt < iosize)
1350                                 break;
1351                         cnt -= iosize;
1352                         ++lblkno;
1353                 }
1354                 BO_UNLOCK(bo);
1355         }
1356         NFSEXITCODE(error);
1357         return (error);
1358 }
1359
1360 /*
1361  * Statfs vnode op.
1362  */
1363 int
1364 nfsvno_statfs(struct vnode *vp, struct statfs *sf)
1365 {
1366         int error;
1367
1368         error = VFS_STATFS(vp->v_mount, sf);
1369         if (error == 0) {
1370                 /*
1371                  * Since NFS handles these values as unsigned on the
1372                  * wire, there is no way to represent negative values,
1373                  * so set them to 0. Without this, they will appear
1374                  * to be very large positive values for clients like
1375                  * Solaris10.
1376                  */
1377                 if (sf->f_bavail < 0)
1378                         sf->f_bavail = 0;
1379                 if (sf->f_ffree < 0)
1380                         sf->f_ffree = 0;
1381         }
1382         NFSEXITCODE(error);
1383         return (error);
1384 }
1385
1386 /*
1387  * Do the vnode op stuff for Open. Similar to nfsvno_createsub(), but
1388  * must handle nfsrv_opencheck() calls after any other access checks.
1389  */
1390 void
1391 nfsvno_open(struct nfsrv_descript *nd, struct nameidata *ndp,
1392     nfsquad_t clientid, nfsv4stateid_t *stateidp, struct nfsstate *stp,
1393     int *exclusive_flagp, struct nfsvattr *nvap, int32_t *cverf, int create,
1394     NFSACL_T *aclp, nfsattrbit_t *attrbitp, struct ucred *cred, struct thread *p,
1395     struct nfsexstuff *exp, struct vnode **vpp)
1396 {
1397         struct vnode *vp = NULL;
1398         u_quad_t tempsize;
1399         struct nfsexstuff nes;
1400
1401         if (ndp->ni_vp == NULL)
1402                 nd->nd_repstat = nfsrv_opencheck(clientid,
1403                     stateidp, stp, NULL, nd, p, nd->nd_repstat);
1404         if (!nd->nd_repstat) {
1405                 if (ndp->ni_vp == NULL) {
1406                         vrele(ndp->ni_startdir);
1407                         nd->nd_repstat = VOP_CREATE(ndp->ni_dvp,
1408                             &ndp->ni_vp, &ndp->ni_cnd, &nvap->na_vattr);
1409                         vput(ndp->ni_dvp);
1410                         nfsvno_relpathbuf(ndp);
1411                         if (!nd->nd_repstat) {
1412                                 if (*exclusive_flagp) {
1413                                         *exclusive_flagp = 0;
1414                                         NFSVNO_ATTRINIT(nvap);
1415                                         nvap->na_atime.tv_sec = cverf[0];
1416                                         nvap->na_atime.tv_nsec = cverf[1];
1417                                         nd->nd_repstat = VOP_SETATTR(ndp->ni_vp,
1418                                             &nvap->na_vattr, cred);
1419                                 } else {
1420                                         nfsrv_fixattr(nd, ndp->ni_vp, nvap,
1421                                             aclp, p, attrbitp, exp);
1422                                 }
1423                         }
1424                         vp = ndp->ni_vp;
1425                 } else {
1426                         if (ndp->ni_startdir)
1427                                 vrele(ndp->ni_startdir);
1428                         nfsvno_relpathbuf(ndp);
1429                         vp = ndp->ni_vp;
1430                         if (create == NFSV4OPEN_CREATE) {
1431                                 if (ndp->ni_dvp == vp)
1432                                         vrele(ndp->ni_dvp);
1433                                 else
1434                                         vput(ndp->ni_dvp);
1435                         }
1436                         if (NFSVNO_ISSETSIZE(nvap) && vp->v_type == VREG) {
1437                                 if (ndp->ni_cnd.cn_flags & RDONLY)
1438                                         NFSVNO_SETEXRDONLY(&nes);
1439                                 else
1440                                         NFSVNO_EXINIT(&nes);
1441                                 nd->nd_repstat = nfsvno_accchk(vp,
1442                                     VWRITE, cred, &nes, p,
1443                                     NFSACCCHK_NOOVERRIDE,
1444                                     NFSACCCHK_VPISLOCKED, NULL);
1445                                 nd->nd_repstat = nfsrv_opencheck(clientid,
1446                                     stateidp, stp, vp, nd, p, nd->nd_repstat);
1447                                 if (!nd->nd_repstat) {
1448                                         tempsize = nvap->na_size;
1449                                         NFSVNO_ATTRINIT(nvap);
1450                                         nvap->na_size = tempsize;
1451                                         nd->nd_repstat = VOP_SETATTR(vp,
1452                                             &nvap->na_vattr, cred);
1453                                 }
1454                         } else if (vp->v_type == VREG) {
1455                                 nd->nd_repstat = nfsrv_opencheck(clientid,
1456                                     stateidp, stp, vp, nd, p, nd->nd_repstat);
1457                         }
1458                 }
1459         } else {
1460                 if (ndp->ni_cnd.cn_flags & HASBUF)
1461                         nfsvno_relpathbuf(ndp);
1462                 if (ndp->ni_startdir && create == NFSV4OPEN_CREATE) {
1463                         vrele(ndp->ni_startdir);
1464                         if (ndp->ni_dvp == ndp->ni_vp)
1465                                 vrele(ndp->ni_dvp);
1466                         else
1467                                 vput(ndp->ni_dvp);
1468                         if (ndp->ni_vp)
1469                                 vput(ndp->ni_vp);
1470                 }
1471         }
1472         *vpp = vp;
1473
1474         NFSEXITCODE2(0, nd);
1475 }
1476
1477 /*
1478  * Updates the file rev and sets the mtime and ctime
1479  * to the current clock time, returning the va_filerev and va_Xtime
1480  * values.
1481  * Return ESTALE to indicate the vnode is VI_DOOMED.
1482  */
1483 int
1484 nfsvno_updfilerev(struct vnode *vp, struct nfsvattr *nvap,
1485     struct ucred *cred, struct thread *p)
1486 {
1487         struct vattr va;
1488
1489         VATTR_NULL(&va);
1490         vfs_timestamp(&va.va_mtime);
1491         if (NFSVOPISLOCKED(vp) != LK_EXCLUSIVE) {
1492                 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
1493                 if ((vp->v_iflag & VI_DOOMED) != 0)
1494                         return (ESTALE);
1495         }
1496         (void) VOP_SETATTR(vp, &va, cred);
1497         (void) nfsvno_getattr(vp, nvap, cred, p, 1);
1498         return (0);
1499 }
1500
1501 /*
1502  * Glue routine to nfsv4_fillattr().
1503  */
1504 int
1505 nfsvno_fillattr(struct nfsrv_descript *nd, struct mount *mp, struct vnode *vp,
1506     struct nfsvattr *nvap, fhandle_t *fhp, int rderror, nfsattrbit_t *attrbitp,
1507     struct ucred *cred, struct thread *p, int isdgram, int reterr,
1508     int supports_nfsv4acls, int at_root, uint64_t mounted_on_fileno)
1509 {
1510         int error;
1511
1512         error = nfsv4_fillattr(nd, mp, vp, NULL, &nvap->na_vattr, fhp, rderror,
1513             attrbitp, cred, p, isdgram, reterr, supports_nfsv4acls, at_root,
1514             mounted_on_fileno);
1515         NFSEXITCODE2(0, nd);
1516         return (error);
1517 }
1518
1519 /* Since the Readdir vnode ops vary, put the entire functions in here. */
1520 /*
1521  * nfs readdir service
1522  * - mallocs what it thinks is enough to read
1523  *      count rounded up to a multiple of DIRBLKSIZ <= NFS_MAXREADDIR
1524  * - calls VOP_READDIR()
1525  * - loops around building the reply
1526  *      if the output generated exceeds count break out of loop
1527  *      The NFSM_CLGET macro is used here so that the reply will be packed
1528  *      tightly in mbuf clusters.
1529  * - it trims out records with d_fileno == 0
1530  *      this doesn't matter for Unix clients, but they might confuse clients
1531  *      for other os'.
1532  * - it trims out records with d_type == DT_WHT
1533  *      these cannot be seen through NFS (unless we extend the protocol)
1534  *     The alternate call nfsrvd_readdirplus() does lookups as well.
1535  * PS: The NFS protocol spec. does not clarify what the "count" byte
1536  *      argument is a count of.. just name strings and file id's or the
1537  *      entire reply rpc or ...
1538  *      I tried just file name and id sizes and it confused the Sun client,
1539  *      so I am using the full rpc size now. The "paranoia.." comment refers
1540  *      to including the status longwords that are not a part of the dir.
1541  *      "entry" structures, but are in the rpc.
1542  */
1543 int
1544 nfsrvd_readdir(struct nfsrv_descript *nd, int isdgram,
1545     struct vnode *vp, struct thread *p, struct nfsexstuff *exp)
1546 {
1547         struct dirent *dp;
1548         u_int32_t *tl;
1549         int dirlen;
1550         char *cpos, *cend, *rbuf;
1551         struct nfsvattr at;
1552         int nlen, error = 0, getret = 1;
1553         int siz, cnt, fullsiz, eofflag, ncookies;
1554         u_int64_t off, toff, verf;
1555         u_long *cookies = NULL, *cookiep;
1556         struct uio io;
1557         struct iovec iv;
1558         int is_ufs;
1559
1560         if (nd->nd_repstat) {
1561                 nfsrv_postopattr(nd, getret, &at);
1562                 goto out;
1563         }
1564         if (nd->nd_flag & ND_NFSV2) {
1565                 NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1566                 off = fxdr_unsigned(u_quad_t, *tl++);
1567         } else {
1568                 NFSM_DISSECT(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
1569                 off = fxdr_hyper(tl);
1570                 tl += 2;
1571                 verf = fxdr_hyper(tl);
1572                 tl += 2;
1573         }
1574         toff = off;
1575         cnt = fxdr_unsigned(int, *tl);
1576         if (cnt > NFS_SRVMAXDATA(nd) || cnt < 0)
1577                 cnt = NFS_SRVMAXDATA(nd);
1578         siz = ((cnt + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1));
1579         fullsiz = siz;
1580         if (nd->nd_flag & ND_NFSV3) {
1581                 nd->nd_repstat = getret = nfsvno_getattr(vp, &at, nd->nd_cred,
1582                     p, 1);
1583 #if 0
1584                 /*
1585                  * va_filerev is not sufficient as a cookie verifier,
1586                  * since it is not supposed to change when entries are
1587                  * removed/added unless that offset cookies returned to
1588                  * the client are no longer valid.
1589                  */
1590                 if (!nd->nd_repstat && toff && verf != at.na_filerev)
1591                         nd->nd_repstat = NFSERR_BAD_COOKIE;
1592 #endif
1593         }
1594         if (!nd->nd_repstat && vp->v_type != VDIR)
1595                 nd->nd_repstat = NFSERR_NOTDIR;
1596         if (nd->nd_repstat == 0 && cnt == 0) {
1597                 if (nd->nd_flag & ND_NFSV2)
1598                         /* NFSv2 does not have NFSERR_TOOSMALL */
1599                         nd->nd_repstat = EPERM;
1600                 else
1601                         nd->nd_repstat = NFSERR_TOOSMALL;
1602         }
1603         if (!nd->nd_repstat)
1604                 nd->nd_repstat = nfsvno_accchk(vp, VEXEC,
1605                     nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
1606                     NFSACCCHK_VPISLOCKED, NULL);
1607         if (nd->nd_repstat) {
1608                 vput(vp);
1609                 if (nd->nd_flag & ND_NFSV3)
1610                         nfsrv_postopattr(nd, getret, &at);
1611                 goto out;
1612         }
1613         is_ufs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "ufs") == 0;
1614         MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
1615 again:
1616         eofflag = 0;
1617         if (cookies) {
1618                 free((caddr_t)cookies, M_TEMP);
1619                 cookies = NULL;
1620         }
1621
1622         iv.iov_base = rbuf;
1623         iv.iov_len = siz;
1624         io.uio_iov = &iv;
1625         io.uio_iovcnt = 1;
1626         io.uio_offset = (off_t)off;
1627         io.uio_resid = siz;
1628         io.uio_segflg = UIO_SYSSPACE;
1629         io.uio_rw = UIO_READ;
1630         io.uio_td = NULL;
1631         nd->nd_repstat = VOP_READDIR(vp, &io, nd->nd_cred, &eofflag, &ncookies,
1632             &cookies);
1633         off = (u_int64_t)io.uio_offset;
1634         if (io.uio_resid)
1635                 siz -= io.uio_resid;
1636
1637         if (!cookies && !nd->nd_repstat)
1638                 nd->nd_repstat = NFSERR_PERM;
1639         if (nd->nd_flag & ND_NFSV3) {
1640                 getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
1641                 if (!nd->nd_repstat)
1642                         nd->nd_repstat = getret;
1643         }
1644
1645         /*
1646          * Handles the failed cases. nd->nd_repstat == 0 past here.
1647          */
1648         if (nd->nd_repstat) {
1649                 vput(vp);
1650                 free((caddr_t)rbuf, M_TEMP);
1651                 if (cookies)
1652                         free((caddr_t)cookies, M_TEMP);
1653                 if (nd->nd_flag & ND_NFSV3)
1654                         nfsrv_postopattr(nd, getret, &at);
1655                 goto out;
1656         }
1657         /*
1658          * If nothing read, return eof
1659          * rpc reply
1660          */
1661         if (siz == 0) {
1662                 vput(vp);
1663                 if (nd->nd_flag & ND_NFSV2) {
1664                         NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1665                 } else {
1666                         nfsrv_postopattr(nd, getret, &at);
1667                         NFSM_BUILD(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
1668                         txdr_hyper(at.na_filerev, tl);
1669                         tl += 2;
1670                 }
1671                 *tl++ = newnfs_false;
1672                 *tl = newnfs_true;
1673                 FREE((caddr_t)rbuf, M_TEMP);
1674                 FREE((caddr_t)cookies, M_TEMP);
1675                 goto out;
1676         }
1677
1678         /*
1679          * Check for degenerate cases of nothing useful read.
1680          * If so go try again
1681          */
1682         cpos = rbuf;
1683         cend = rbuf + siz;
1684         dp = (struct dirent *)cpos;
1685         cookiep = cookies;
1686
1687         /*
1688          * For some reason FreeBSD's ufs_readdir() chooses to back the
1689          * directory offset up to a block boundary, so it is necessary to
1690          * skip over the records that precede the requested offset. This
1691          * requires the assumption that file offset cookies monotonically
1692          * increase.
1693          */
1694         while (cpos < cend && ncookies > 0 &&
1695             (dp->d_fileno == 0 || dp->d_type == DT_WHT ||
1696              (is_ufs == 1 && ((u_quad_t)(*cookiep)) <= toff))) {
1697                 cpos += dp->d_reclen;
1698                 dp = (struct dirent *)cpos;
1699                 cookiep++;
1700                 ncookies--;
1701         }
1702         if (cpos >= cend || ncookies == 0) {
1703                 siz = fullsiz;
1704                 toff = off;
1705                 goto again;
1706         }
1707         vput(vp);
1708
1709         /*
1710          * dirlen is the size of the reply, including all XDR and must
1711          * not exceed cnt. For NFSv2, RFC1094 didn't clearly indicate
1712          * if the XDR should be included in "count", but to be safe, we do.
1713          * (Include the two booleans at the end of the reply in dirlen now.)
1714          */
1715         if (nd->nd_flag & ND_NFSV3) {
1716                 nfsrv_postopattr(nd, getret, &at);
1717                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1718                 txdr_hyper(at.na_filerev, tl);
1719                 dirlen = NFSX_V3POSTOPATTR + NFSX_VERF + 2 * NFSX_UNSIGNED;
1720         } else {
1721                 dirlen = 2 * NFSX_UNSIGNED;
1722         }
1723
1724         /* Loop through the records and build reply */
1725         while (cpos < cend && ncookies > 0) {
1726                 nlen = dp->d_namlen;
1727                 if (dp->d_fileno != 0 && dp->d_type != DT_WHT &&
1728                         nlen <= NFS_MAXNAMLEN) {
1729                         if (nd->nd_flag & ND_NFSV3)
1730                                 dirlen += (6*NFSX_UNSIGNED + NFSM_RNDUP(nlen));
1731                         else
1732                                 dirlen += (4*NFSX_UNSIGNED + NFSM_RNDUP(nlen));
1733                         if (dirlen > cnt) {
1734                                 eofflag = 0;
1735                                 break;
1736                         }
1737
1738                         /*
1739                          * Build the directory record xdr from
1740                          * the dirent entry.
1741                          */
1742                         if (nd->nd_flag & ND_NFSV3) {
1743                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1744                                 *tl++ = newnfs_true;
1745                                 *tl++ = 0;
1746                         } else {
1747                                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1748                                 *tl++ = newnfs_true;
1749                         }
1750                         *tl = txdr_unsigned(dp->d_fileno);
1751                         (void) nfsm_strtom(nd, dp->d_name, nlen);
1752                         if (nd->nd_flag & ND_NFSV3) {
1753                                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1754                                 *tl++ = 0;
1755                         } else
1756                                 NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
1757                         *tl = txdr_unsigned(*cookiep);
1758                 }
1759                 cpos += dp->d_reclen;
1760                 dp = (struct dirent *)cpos;
1761                 cookiep++;
1762                 ncookies--;
1763         }
1764         if (cpos < cend)
1765                 eofflag = 0;
1766         NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1767         *tl++ = newnfs_false;
1768         if (eofflag)
1769                 *tl = newnfs_true;
1770         else
1771                 *tl = newnfs_false;
1772         FREE((caddr_t)rbuf, M_TEMP);
1773         FREE((caddr_t)cookies, M_TEMP);
1774
1775 out:
1776         NFSEXITCODE2(0, nd);
1777         return (0);
1778 nfsmout:
1779         vput(vp);
1780         NFSEXITCODE2(error, nd);
1781         return (error);
1782 }
1783
1784 /*
1785  * Readdirplus for V3 and Readdir for V4.
1786  */
1787 int
1788 nfsrvd_readdirplus(struct nfsrv_descript *nd, int isdgram,
1789     struct vnode *vp, struct thread *p, struct nfsexstuff *exp)
1790 {
1791         struct dirent *dp;
1792         u_int32_t *tl;
1793         int dirlen;
1794         char *cpos, *cend, *rbuf;
1795         struct vnode *nvp;
1796         fhandle_t nfh;
1797         struct nfsvattr nva, at, *nvap = &nva;
1798         struct mbuf *mb0, *mb1;
1799         struct nfsreferral *refp;
1800         int nlen, r, error = 0, getret = 1, usevget = 1;
1801         int siz, cnt, fullsiz, eofflag, ncookies, entrycnt;
1802         caddr_t bpos0, bpos1;
1803         u_int64_t off, toff, verf;
1804         u_long *cookies = NULL, *cookiep;
1805         nfsattrbit_t attrbits, rderrbits, savbits;
1806         struct uio io;
1807         struct iovec iv;
1808         struct componentname cn;
1809         int at_root, is_ufs, is_zfs, needs_unbusy, supports_nfsv4acls;
1810         struct mount *mp, *new_mp;
1811         uint64_t mounted_on_fileno;
1812
1813         if (nd->nd_repstat) {
1814                 nfsrv_postopattr(nd, getret, &at);
1815                 goto out;
1816         }
1817         NFSM_DISSECT(tl, u_int32_t *, 6 * NFSX_UNSIGNED);
1818         off = fxdr_hyper(tl);
1819         toff = off;
1820         tl += 2;
1821         verf = fxdr_hyper(tl);
1822         tl += 2;
1823         siz = fxdr_unsigned(int, *tl++);
1824         cnt = fxdr_unsigned(int, *tl);
1825
1826         /*
1827          * Use the server's maximum data transfer size as the upper bound
1828          * on reply datalen.
1829          */
1830         if (cnt > NFS_SRVMAXDATA(nd) || cnt < 0)
1831                 cnt = NFS_SRVMAXDATA(nd);
1832
1833         /*
1834          * siz is a "hint" of how much directory information (name, fileid,
1835          * cookie) should be in the reply. At least one client "hints" 0,
1836          * so I set it to cnt for that case. I also round it up to the
1837          * next multiple of DIRBLKSIZ.
1838          */
1839         if (siz <= 0)
1840                 siz = cnt;
1841         siz = ((siz + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1));
1842
1843         if (nd->nd_flag & ND_NFSV4) {
1844                 error = nfsrv_getattrbits(nd, &attrbits, NULL, NULL);
1845                 if (error)
1846                         goto nfsmout;
1847                 NFSSET_ATTRBIT(&savbits, &attrbits);
1848                 NFSCLRNOTFILLABLE_ATTRBIT(&attrbits);
1849                 NFSZERO_ATTRBIT(&rderrbits);
1850                 NFSSETBIT_ATTRBIT(&rderrbits, NFSATTRBIT_RDATTRERROR);
1851         } else {
1852                 NFSZERO_ATTRBIT(&attrbits);
1853         }
1854         fullsiz = siz;
1855         nd->nd_repstat = getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
1856         if (!nd->nd_repstat) {
1857             if (off && verf != at.na_filerev) {
1858                 /*
1859                  * va_filerev is not sufficient as a cookie verifier,
1860                  * since it is not supposed to change when entries are
1861                  * removed/added unless that offset cookies returned to
1862                  * the client are no longer valid.
1863                  */
1864 #if 0
1865                 if (nd->nd_flag & ND_NFSV4) {
1866                         nd->nd_repstat = NFSERR_NOTSAME;
1867                 } else {
1868                         nd->nd_repstat = NFSERR_BAD_COOKIE;
1869                 }
1870 #endif
1871             } else if ((nd->nd_flag & ND_NFSV4) && off == 0 && verf != 0) {
1872                 nd->nd_repstat = NFSERR_BAD_COOKIE;
1873             }
1874         }
1875         if (!nd->nd_repstat && vp->v_type != VDIR)
1876                 nd->nd_repstat = NFSERR_NOTDIR;
1877         if (!nd->nd_repstat && cnt == 0)
1878                 nd->nd_repstat = NFSERR_TOOSMALL;
1879         if (!nd->nd_repstat)
1880                 nd->nd_repstat = nfsvno_accchk(vp, VEXEC,
1881                     nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
1882                     NFSACCCHK_VPISLOCKED, NULL);
1883         if (nd->nd_repstat) {
1884                 vput(vp);
1885                 if (nd->nd_flag & ND_NFSV3)
1886                         nfsrv_postopattr(nd, getret, &at);
1887                 goto out;
1888         }
1889         is_ufs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "ufs") == 0;
1890         is_zfs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "zfs") == 0;
1891
1892         MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
1893 again:
1894         eofflag = 0;
1895         if (cookies) {
1896                 free((caddr_t)cookies, M_TEMP);
1897                 cookies = NULL;
1898         }
1899
1900         iv.iov_base = rbuf;
1901         iv.iov_len = siz;
1902         io.uio_iov = &iv;
1903         io.uio_iovcnt = 1;
1904         io.uio_offset = (off_t)off;
1905         io.uio_resid = siz;
1906         io.uio_segflg = UIO_SYSSPACE;
1907         io.uio_rw = UIO_READ;
1908         io.uio_td = NULL;
1909         nd->nd_repstat = VOP_READDIR(vp, &io, nd->nd_cred, &eofflag, &ncookies,
1910             &cookies);
1911         off = (u_int64_t)io.uio_offset;
1912         if (io.uio_resid)
1913                 siz -= io.uio_resid;
1914
1915         getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
1916
1917         if (!cookies && !nd->nd_repstat)
1918                 nd->nd_repstat = NFSERR_PERM;
1919         if (!nd->nd_repstat)
1920                 nd->nd_repstat = getret;
1921         if (nd->nd_repstat) {
1922                 vput(vp);
1923                 if (cookies)
1924                         free((caddr_t)cookies, M_TEMP);
1925                 free((caddr_t)rbuf, M_TEMP);
1926                 if (nd->nd_flag & ND_NFSV3)
1927                         nfsrv_postopattr(nd, getret, &at);
1928                 goto out;
1929         }
1930         /*
1931          * If nothing read, return eof
1932          * rpc reply
1933          */
1934         if (siz == 0) {
1935                 vput(vp);
1936                 if (nd->nd_flag & ND_NFSV3)
1937                         nfsrv_postopattr(nd, getret, &at);
1938                 NFSM_BUILD(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
1939                 txdr_hyper(at.na_filerev, tl);
1940                 tl += 2;
1941                 *tl++ = newnfs_false;
1942                 *tl = newnfs_true;
1943                 free((caddr_t)cookies, M_TEMP);
1944                 free((caddr_t)rbuf, M_TEMP);
1945                 goto out;
1946         }
1947
1948         /*
1949          * Check for degenerate cases of nothing useful read.
1950          * If so go try again
1951          */
1952         cpos = rbuf;
1953         cend = rbuf + siz;
1954         dp = (struct dirent *)cpos;
1955         cookiep = cookies;
1956
1957         /*
1958          * For some reason FreeBSD's ufs_readdir() chooses to back the
1959          * directory offset up to a block boundary, so it is necessary to
1960          * skip over the records that precede the requested offset. This
1961          * requires the assumption that file offset cookies monotonically
1962          * increase.
1963          */
1964         while (cpos < cend && ncookies > 0 &&
1965           (dp->d_fileno == 0 || dp->d_type == DT_WHT ||
1966            (is_ufs == 1 && ((u_quad_t)(*cookiep)) <= toff) ||
1967            ((nd->nd_flag & ND_NFSV4) &&
1968             ((dp->d_namlen == 1 && dp->d_name[0] == '.') ||
1969              (dp->d_namlen==2 && dp->d_name[0]=='.' && dp->d_name[1]=='.'))))) {
1970                 cpos += dp->d_reclen;
1971                 dp = (struct dirent *)cpos;
1972                 cookiep++;
1973                 ncookies--;
1974         }
1975         if (cpos >= cend || ncookies == 0) {
1976                 siz = fullsiz;
1977                 toff = off;
1978                 goto again;
1979         }
1980
1981         /*
1982          * Busy the file system so that the mount point won't go away
1983          * and, as such, VFS_VGET() can be used safely.
1984          */
1985         mp = vp->v_mount;
1986         vfs_ref(mp);
1987         NFSVOPUNLOCK(vp, 0);
1988         nd->nd_repstat = vfs_busy(mp, 0);
1989         vfs_rel(mp);
1990         if (nd->nd_repstat != 0) {
1991                 vrele(vp);
1992                 free(cookies, M_TEMP);
1993                 free(rbuf, M_TEMP);
1994                 if (nd->nd_flag & ND_NFSV3)
1995                         nfsrv_postopattr(nd, getret, &at);
1996                 goto out;
1997         }
1998
1999         /*
2000          * Check to see if entries in this directory can be safely acquired
2001          * via VFS_VGET() or if a switch to VOP_LOOKUP() is required.
2002          * ZFS snapshot directories need VOP_LOOKUP(), so that any
2003          * automount of the snapshot directory that is required will
2004          * be done.
2005          * This needs to be done here for NFSv4, since NFSv4 never does
2006          * a VFS_VGET() for "." or "..".
2007          */
2008         if (is_zfs == 1) {
2009                 r = VFS_VGET(mp, at.na_fileid, LK_SHARED, &nvp);
2010                 if (r == EOPNOTSUPP) {
2011                         usevget = 0;
2012                         cn.cn_nameiop = LOOKUP;
2013                         cn.cn_lkflags = LK_SHARED | LK_RETRY;
2014                         cn.cn_cred = nd->nd_cred;
2015                         cn.cn_thread = p;
2016                 } else if (r == 0)
2017                         vput(nvp);
2018         }
2019
2020         /*
2021          * Save this position, in case there is an error before one entry
2022          * is created.
2023          */
2024         mb0 = nd->nd_mb;
2025         bpos0 = nd->nd_bpos;
2026
2027         /*
2028          * Fill in the first part of the reply.
2029          * dirlen is the reply length in bytes and cannot exceed cnt.
2030          * (Include the two booleans at the end of the reply in dirlen now,
2031          *  so we recognize when we have exceeded cnt.)
2032          */
2033         if (nd->nd_flag & ND_NFSV3) {
2034                 dirlen = NFSX_V3POSTOPATTR + NFSX_VERF + 2 * NFSX_UNSIGNED;
2035                 nfsrv_postopattr(nd, getret, &at);
2036         } else {
2037                 dirlen = NFSX_VERF + 2 * NFSX_UNSIGNED;
2038         }
2039         NFSM_BUILD(tl, u_int32_t *, NFSX_VERF);
2040         txdr_hyper(at.na_filerev, tl);
2041
2042         /*
2043          * Save this position, in case there is an empty reply needed.
2044          */
2045         mb1 = nd->nd_mb;
2046         bpos1 = nd->nd_bpos;
2047
2048         /* Loop through the records and build reply */
2049         entrycnt = 0;
2050         while (cpos < cend && ncookies > 0 && dirlen < cnt) {
2051                 nlen = dp->d_namlen;
2052                 if (dp->d_fileno != 0 && dp->d_type != DT_WHT &&
2053                     nlen <= NFS_MAXNAMLEN &&
2054                     ((nd->nd_flag & ND_NFSV3) || nlen > 2 ||
2055                      (nlen==2 && (dp->d_name[0]!='.' || dp->d_name[1]!='.'))
2056                       || (nlen == 1 && dp->d_name[0] != '.'))) {
2057                         /*
2058                          * Save the current position in the reply, in case
2059                          * this entry exceeds cnt.
2060                          */
2061                         mb1 = nd->nd_mb;
2062                         bpos1 = nd->nd_bpos;
2063
2064                         /*
2065                          * For readdir_and_lookup get the vnode using
2066                          * the file number.
2067                          */
2068                         nvp = NULL;
2069                         refp = NULL;
2070                         r = 0;
2071                         at_root = 0;
2072                         needs_unbusy = 0;
2073                         new_mp = mp;
2074                         mounted_on_fileno = (uint64_t)dp->d_fileno;
2075                         if ((nd->nd_flag & ND_NFSV3) ||
2076                             NFSNONZERO_ATTRBIT(&savbits)) {
2077                                 if (nd->nd_flag & ND_NFSV4)
2078                                         refp = nfsv4root_getreferral(NULL,
2079                                             vp, dp->d_fileno);
2080                                 if (refp == NULL) {
2081                                         if (usevget)
2082                                                 r = VFS_VGET(mp, dp->d_fileno,
2083                                                     LK_SHARED, &nvp);
2084                                         else
2085                                                 r = EOPNOTSUPP;
2086                                         if (r == EOPNOTSUPP) {
2087                                                 if (usevget) {
2088                                                         usevget = 0;
2089                                                         cn.cn_nameiop = LOOKUP;
2090                                                         cn.cn_lkflags =
2091                                                             LK_SHARED |
2092                                                             LK_RETRY;
2093                                                         cn.cn_cred =
2094                                                             nd->nd_cred;
2095                                                         cn.cn_thread = p;
2096                                                 }
2097                                                 cn.cn_nameptr = dp->d_name;
2098                                                 cn.cn_namelen = nlen;
2099                                                 cn.cn_flags = ISLASTCN |
2100                                                     NOFOLLOW | LOCKLEAF;
2101                                                 if (nlen == 2 &&
2102                                                     dp->d_name[0] == '.' &&
2103                                                     dp->d_name[1] == '.')
2104                                                         cn.cn_flags |=
2105                                                             ISDOTDOT;
2106                                                 if (NFSVOPLOCK(vp, LK_SHARED)
2107                                                     != 0) {
2108                                                         nd->nd_repstat = EPERM;
2109                                                         break;
2110                                                 }
2111                                                 if ((vp->v_vflag & VV_ROOT) != 0
2112                                                     && (cn.cn_flags & ISDOTDOT)
2113                                                     != 0) {
2114                                                         vref(vp);
2115                                                         nvp = vp;
2116                                                         r = 0;
2117                                                 } else {
2118                                                         r = VOP_LOOKUP(vp, &nvp,
2119                                                             &cn);
2120                                                         if (vp != nvp)
2121                                                                 NFSVOPUNLOCK(vp,
2122                                                                     0);
2123                                                 }
2124                                         }
2125
2126                                         /*
2127                                          * For NFSv4, check to see if nvp is
2128                                          * a mount point and get the mount
2129                                          * point vnode, as required.
2130                                          */
2131                                         if (r == 0 &&
2132                                             nfsrv_enable_crossmntpt != 0 &&
2133                                             (nd->nd_flag & ND_NFSV4) != 0 &&
2134                                             nvp->v_type == VDIR &&
2135                                             nvp->v_mountedhere != NULL) {
2136                                                 new_mp = nvp->v_mountedhere;
2137                                                 r = vfs_busy(new_mp, 0);
2138                                                 vput(nvp);
2139                                                 nvp = NULL;
2140                                                 if (r == 0) {
2141                                                         r = VFS_ROOT(new_mp,
2142                                                             LK_SHARED, &nvp);
2143                                                         needs_unbusy = 1;
2144                                                         if (r == 0)
2145                                                                 at_root = 1;
2146                                                 }
2147                                         }
2148                                 }
2149                                 if (!r) {
2150                                     if (refp == NULL &&
2151                                         ((nd->nd_flag & ND_NFSV3) ||
2152                                          NFSNONZERO_ATTRBIT(&attrbits))) {
2153                                         r = nfsvno_getfh(nvp, &nfh, p);
2154                                         if (!r)
2155                                             r = nfsvno_getattr(nvp, nvap,
2156                                                 nd->nd_cred, p, 1);
2157                                         if (r == 0 && is_zfs == 1 &&
2158                                             nfsrv_enable_crossmntpt != 0 &&
2159                                             (nd->nd_flag & ND_NFSV4) != 0 &&
2160                                             nvp->v_type == VDIR &&
2161                                             vp->v_mount != nvp->v_mount) {
2162                                             /*
2163                                              * For a ZFS snapshot, there is a
2164                                              * pseudo mount that does not set
2165                                              * v_mountedhere, so it needs to
2166                                              * be detected via a different
2167                                              * mount structure.
2168                                              */
2169                                             at_root = 1;
2170                                             if (new_mp == mp)
2171                                                 new_mp = nvp->v_mount;
2172                                         }
2173                                     }
2174                                 } else {
2175                                     nvp = NULL;
2176                                 }
2177                                 if (r) {
2178                                         if (!NFSISSET_ATTRBIT(&attrbits,
2179                                             NFSATTRBIT_RDATTRERROR)) {
2180                                                 if (nvp != NULL)
2181                                                         vput(nvp);
2182                                                 if (needs_unbusy != 0)
2183                                                         vfs_unbusy(new_mp);
2184                                                 nd->nd_repstat = r;
2185                                                 break;
2186                                         }
2187                                 }
2188                         }
2189
2190                         /*
2191                          * Build the directory record xdr
2192                          */
2193                         if (nd->nd_flag & ND_NFSV3) {
2194                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
2195                                 *tl++ = newnfs_true;
2196                                 *tl++ = 0;
2197                                 *tl = txdr_unsigned(dp->d_fileno);
2198                                 dirlen += nfsm_strtom(nd, dp->d_name, nlen);
2199                                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2200                                 *tl++ = 0;
2201                                 *tl = txdr_unsigned(*cookiep);
2202                                 nfsrv_postopattr(nd, 0, nvap);
2203                                 dirlen += nfsm_fhtom(nd,(u_int8_t *)&nfh,0,1);
2204                                 dirlen += (5*NFSX_UNSIGNED+NFSX_V3POSTOPATTR);
2205                                 if (nvp != NULL)
2206                                         vput(nvp);
2207                         } else {
2208                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
2209                                 *tl++ = newnfs_true;
2210                                 *tl++ = 0;
2211                                 *tl = txdr_unsigned(*cookiep);
2212                                 dirlen += nfsm_strtom(nd, dp->d_name, nlen);
2213                                 if (nvp != NULL) {
2214                                         supports_nfsv4acls =
2215                                             nfs_supportsnfsv4acls(nvp);
2216                                         NFSVOPUNLOCK(nvp, 0);
2217                                 } else
2218                                         supports_nfsv4acls = 0;
2219                                 if (refp != NULL) {
2220                                         dirlen += nfsrv_putreferralattr(nd,
2221                                             &savbits, refp, 0,
2222                                             &nd->nd_repstat);
2223                                         if (nd->nd_repstat) {
2224                                                 if (nvp != NULL)
2225                                                         vrele(nvp);
2226                                                 if (needs_unbusy != 0)
2227                                                         vfs_unbusy(new_mp);
2228                                                 break;
2229                                         }
2230                                 } else if (r) {
2231                                         dirlen += nfsvno_fillattr(nd, new_mp,
2232                                             nvp, nvap, &nfh, r, &rderrbits,
2233                                             nd->nd_cred, p, isdgram, 0,
2234                                             supports_nfsv4acls, at_root,
2235                                             mounted_on_fileno);
2236                                 } else {
2237                                         dirlen += nfsvno_fillattr(nd, new_mp,
2238                                             nvp, nvap, &nfh, r, &attrbits,
2239                                             nd->nd_cred, p, isdgram, 0,
2240                                             supports_nfsv4acls, at_root,
2241                                             mounted_on_fileno);
2242                                 }
2243                                 if (nvp != NULL)
2244                                         vrele(nvp);
2245                                 dirlen += (3 * NFSX_UNSIGNED);
2246                         }
2247                         if (needs_unbusy != 0)
2248                                 vfs_unbusy(new_mp);
2249                         if (dirlen <= cnt)
2250                                 entrycnt++;
2251                 }
2252                 cpos += dp->d_reclen;
2253                 dp = (struct dirent *)cpos;
2254                 cookiep++;
2255                 ncookies--;
2256         }
2257         vrele(vp);
2258         vfs_unbusy(mp);
2259
2260         /*
2261          * If dirlen > cnt, we must strip off the last entry. If that
2262          * results in an empty reply, report NFSERR_TOOSMALL.
2263          */
2264         if (dirlen > cnt || nd->nd_repstat) {
2265                 if (!nd->nd_repstat && entrycnt == 0)
2266                         nd->nd_repstat = NFSERR_TOOSMALL;
2267                 if (nd->nd_repstat)
2268                         newnfs_trimtrailing(nd, mb0, bpos0);
2269                 else
2270                         newnfs_trimtrailing(nd, mb1, bpos1);
2271                 eofflag = 0;
2272         } else if (cpos < cend)
2273                 eofflag = 0;
2274         if (!nd->nd_repstat) {
2275                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2276                 *tl++ = newnfs_false;
2277                 if (eofflag)
2278                         *tl = newnfs_true;
2279                 else
2280                         *tl = newnfs_false;
2281         }
2282         FREE((caddr_t)cookies, M_TEMP);
2283         FREE((caddr_t)rbuf, M_TEMP);
2284
2285 out:
2286         NFSEXITCODE2(0, nd);
2287         return (0);
2288 nfsmout:
2289         vput(vp);
2290         NFSEXITCODE2(error, nd);
2291         return (error);
2292 }
2293
2294 /*
2295  * Get the settable attributes out of the mbuf list.
2296  * (Return 0 or EBADRPC)
2297  */
2298 int
2299 nfsrv_sattr(struct nfsrv_descript *nd, struct nfsvattr *nvap,
2300     nfsattrbit_t *attrbitp, NFSACL_T *aclp, struct thread *p)
2301 {
2302         u_int32_t *tl;
2303         struct nfsv2_sattr *sp;
2304         int error = 0, toclient = 0;
2305
2306         switch (nd->nd_flag & (ND_NFSV2 | ND_NFSV3 | ND_NFSV4)) {
2307         case ND_NFSV2:
2308                 NFSM_DISSECT(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
2309                 /*
2310                  * Some old clients didn't fill in the high order 16bits.
2311                  * --> check the low order 2 bytes for 0xffff
2312                  */
2313                 if ((fxdr_unsigned(int, sp->sa_mode) & 0xffff) != 0xffff)
2314                         nvap->na_mode = nfstov_mode(sp->sa_mode);
2315                 if (sp->sa_uid != newnfs_xdrneg1)
2316                         nvap->na_uid = fxdr_unsigned(uid_t, sp->sa_uid);
2317                 if (sp->sa_gid != newnfs_xdrneg1)
2318                         nvap->na_gid = fxdr_unsigned(gid_t, sp->sa_gid);
2319                 if (sp->sa_size != newnfs_xdrneg1)
2320                         nvap->na_size = fxdr_unsigned(u_quad_t, sp->sa_size);
2321                 if (sp->sa_atime.nfsv2_sec != newnfs_xdrneg1) {
2322 #ifdef notyet
2323                         fxdr_nfsv2time(&sp->sa_atime, &nvap->na_atime);
2324 #else
2325                         nvap->na_atime.tv_sec =
2326                                 fxdr_unsigned(u_int32_t,sp->sa_atime.nfsv2_sec);
2327                         nvap->na_atime.tv_nsec = 0;
2328 #endif
2329                 }
2330                 if (sp->sa_mtime.nfsv2_sec != newnfs_xdrneg1)
2331                         fxdr_nfsv2time(&sp->sa_mtime, &nvap->na_mtime);
2332                 break;
2333         case ND_NFSV3:
2334                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2335                 if (*tl == newnfs_true) {
2336                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2337                         nvap->na_mode = nfstov_mode(*tl);
2338                 }
2339                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2340                 if (*tl == newnfs_true) {
2341                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2342                         nvap->na_uid = fxdr_unsigned(uid_t, *tl);
2343                 }
2344                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2345                 if (*tl == newnfs_true) {
2346                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2347                         nvap->na_gid = fxdr_unsigned(gid_t, *tl);
2348                 }
2349                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2350                 if (*tl == newnfs_true) {
2351                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2352                         nvap->na_size = fxdr_hyper(tl);
2353                 }
2354                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2355                 switch (fxdr_unsigned(int, *tl)) {
2356                 case NFSV3SATTRTIME_TOCLIENT:
2357                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2358                         fxdr_nfsv3time(tl, &nvap->na_atime);
2359                         toclient = 1;
2360                         break;
2361                 case NFSV3SATTRTIME_TOSERVER:
2362                         vfs_timestamp(&nvap->na_atime);
2363                         nvap->na_vaflags |= VA_UTIMES_NULL;
2364                         break;
2365                 };
2366                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2367                 switch (fxdr_unsigned(int, *tl)) {
2368                 case NFSV3SATTRTIME_TOCLIENT:
2369                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2370                         fxdr_nfsv3time(tl, &nvap->na_mtime);
2371                         nvap->na_vaflags &= ~VA_UTIMES_NULL;
2372                         break;
2373                 case NFSV3SATTRTIME_TOSERVER:
2374                         vfs_timestamp(&nvap->na_mtime);
2375                         if (!toclient)
2376                                 nvap->na_vaflags |= VA_UTIMES_NULL;
2377                         break;
2378                 };
2379                 break;
2380         case ND_NFSV4:
2381                 error = nfsv4_sattr(nd, nvap, attrbitp, aclp, p);
2382         };
2383 nfsmout:
2384         NFSEXITCODE2(error, nd);
2385         return (error);
2386 }
2387
2388 /*
2389  * Handle the setable attributes for V4.
2390  * Returns NFSERR_BADXDR if it can't be parsed, 0 otherwise.
2391  */
2392 int
2393 nfsv4_sattr(struct nfsrv_descript *nd, struct nfsvattr *nvap,
2394     nfsattrbit_t *attrbitp, NFSACL_T *aclp, struct thread *p)
2395 {
2396         u_int32_t *tl;
2397         int attrsum = 0;
2398         int i, j;
2399         int error, attrsize, bitpos, aclsize, aceerr, retnotsup = 0;
2400         int toclient = 0;
2401         u_char *cp, namestr[NFSV4_SMALLSTR + 1];
2402         uid_t uid;
2403         gid_t gid;
2404
2405         error = nfsrv_getattrbits(nd, attrbitp, NULL, &retnotsup);
2406         if (error)
2407                 goto nfsmout;
2408         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2409         attrsize = fxdr_unsigned(int, *tl);
2410
2411         /*
2412          * Loop around getting the setable attributes. If an unsupported
2413          * one is found, set nd_repstat == NFSERR_ATTRNOTSUPP and return.
2414          */
2415         if (retnotsup) {
2416                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2417                 bitpos = NFSATTRBIT_MAX;
2418         } else {
2419                 bitpos = 0;
2420         }
2421         for (; bitpos < NFSATTRBIT_MAX; bitpos++) {
2422             if (attrsum > attrsize) {
2423                 error = NFSERR_BADXDR;
2424                 goto nfsmout;
2425             }
2426             if (NFSISSET_ATTRBIT(attrbitp, bitpos))
2427                 switch (bitpos) {
2428                 case NFSATTRBIT_SIZE:
2429                         NFSM_DISSECT(tl, u_int32_t *, NFSX_HYPER);
2430                         nvap->na_size = fxdr_hyper(tl);
2431                         attrsum += NFSX_HYPER;
2432                         break;
2433                 case NFSATTRBIT_ACL:
2434                         error = nfsrv_dissectacl(nd, aclp, &aceerr, &aclsize,
2435                             p);
2436                         if (error)
2437                                 goto nfsmout;
2438                         if (aceerr && !nd->nd_repstat)
2439                                 nd->nd_repstat = aceerr;
2440                         attrsum += aclsize;
2441                         break;
2442                 case NFSATTRBIT_ARCHIVE:
2443                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2444                         if (!nd->nd_repstat)
2445                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2446                         attrsum += NFSX_UNSIGNED;
2447                         break;
2448                 case NFSATTRBIT_HIDDEN:
2449                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2450                         if (!nd->nd_repstat)
2451                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2452                         attrsum += NFSX_UNSIGNED;
2453                         break;
2454                 case NFSATTRBIT_MIMETYPE:
2455                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2456                         i = fxdr_unsigned(int, *tl);
2457                         error = nfsm_advance(nd, NFSM_RNDUP(i), -1);
2458                         if (error)
2459                                 goto nfsmout;
2460                         if (!nd->nd_repstat)
2461                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2462                         attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(i));
2463                         break;
2464                 case NFSATTRBIT_MODE:
2465                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2466                         nvap->na_mode = nfstov_mode(*tl);
2467                         attrsum += NFSX_UNSIGNED;
2468                         break;
2469                 case NFSATTRBIT_OWNER:
2470                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2471                         j = fxdr_unsigned(int, *tl);
2472                         if (j < 0) {
2473                                 error = NFSERR_BADXDR;
2474                                 goto nfsmout;
2475                         }
2476                         if (j > NFSV4_SMALLSTR)
2477                                 cp = malloc(j + 1, M_NFSSTRING, M_WAITOK);
2478                         else
2479                                 cp = namestr;
2480                         error = nfsrv_mtostr(nd, cp, j);
2481                         if (error) {
2482                                 if (j > NFSV4_SMALLSTR)
2483                                         free(cp, M_NFSSTRING);
2484                                 goto nfsmout;
2485                         }
2486                         if (!nd->nd_repstat) {
2487                                 nd->nd_repstat = nfsv4_strtouid(nd, cp, j, &uid,
2488                                     p);
2489                                 if (!nd->nd_repstat)
2490                                         nvap->na_uid = uid;
2491                         }
2492                         if (j > NFSV4_SMALLSTR)
2493                                 free(cp, M_NFSSTRING);
2494                         attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(j));
2495                         break;
2496                 case NFSATTRBIT_OWNERGROUP:
2497                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2498                         j = fxdr_unsigned(int, *tl);
2499                         if (j < 0) {
2500                                 error = NFSERR_BADXDR;
2501                                 goto nfsmout;
2502                         }
2503                         if (j > NFSV4_SMALLSTR)
2504                                 cp = malloc(j + 1, M_NFSSTRING, M_WAITOK);
2505                         else
2506                                 cp = namestr;
2507                         error = nfsrv_mtostr(nd, cp, j);
2508                         if (error) {
2509                                 if (j > NFSV4_SMALLSTR)
2510                                         free(cp, M_NFSSTRING);
2511                                 goto nfsmout;
2512                         }
2513                         if (!nd->nd_repstat) {
2514                                 nd->nd_repstat = nfsv4_strtogid(nd, cp, j, &gid,
2515                                     p);
2516                                 if (!nd->nd_repstat)
2517                                         nvap->na_gid = gid;
2518                         }
2519                         if (j > NFSV4_SMALLSTR)
2520                                 free(cp, M_NFSSTRING);
2521                         attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(j));
2522                         break;
2523                 case NFSATTRBIT_SYSTEM:
2524                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2525                         if (!nd->nd_repstat)
2526                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2527                         attrsum += NFSX_UNSIGNED;
2528                         break;
2529                 case NFSATTRBIT_TIMEACCESSSET:
2530                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2531                         attrsum += NFSX_UNSIGNED;
2532                         if (fxdr_unsigned(int, *tl)==NFSV4SATTRTIME_TOCLIENT) {
2533                             NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2534                             fxdr_nfsv4time(tl, &nvap->na_atime);
2535                             toclient = 1;
2536                             attrsum += NFSX_V4TIME;
2537                         } else {
2538                             vfs_timestamp(&nvap->na_atime);
2539                             nvap->na_vaflags |= VA_UTIMES_NULL;
2540                         }
2541                         break;
2542                 case NFSATTRBIT_TIMEBACKUP:
2543                         NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2544                         if (!nd->nd_repstat)
2545                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2546                         attrsum += NFSX_V4TIME;
2547                         break;
2548                 case NFSATTRBIT_TIMECREATE:
2549                         NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2550                         if (!nd->nd_repstat)
2551                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2552                         attrsum += NFSX_V4TIME;
2553                         break;
2554                 case NFSATTRBIT_TIMEMODIFYSET:
2555                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2556                         attrsum += NFSX_UNSIGNED;
2557                         if (fxdr_unsigned(int, *tl)==NFSV4SATTRTIME_TOCLIENT) {
2558                             NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2559                             fxdr_nfsv4time(tl, &nvap->na_mtime);
2560                             nvap->na_vaflags &= ~VA_UTIMES_NULL;
2561                             attrsum += NFSX_V4TIME;
2562                         } else {
2563                             vfs_timestamp(&nvap->na_mtime);
2564                             if (!toclient)
2565                                 nvap->na_vaflags |= VA_UTIMES_NULL;
2566                         }
2567                         break;
2568                 default:
2569                         nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2570                         /*
2571                          * set bitpos so we drop out of the loop.
2572                          */
2573                         bitpos = NFSATTRBIT_MAX;
2574                         break;
2575                 };
2576         }
2577
2578         /*
2579          * some clients pad the attrlist, so we need to skip over the
2580          * padding.
2581          */
2582         if (attrsum > attrsize) {
2583                 error = NFSERR_BADXDR;
2584         } else {
2585                 attrsize = NFSM_RNDUP(attrsize);
2586                 if (attrsum < attrsize)
2587                         error = nfsm_advance(nd, attrsize - attrsum, -1);
2588         }
2589 nfsmout:
2590         NFSEXITCODE2(error, nd);
2591         return (error);
2592 }
2593
2594 /*
2595  * Check/setup export credentials.
2596  */
2597 int
2598 nfsd_excred(struct nfsrv_descript *nd, struct nfsexstuff *exp,
2599     struct ucred *credanon)
2600 {
2601         int error = 0;
2602
2603         /*
2604          * Check/setup credentials.
2605          */
2606         if (nd->nd_flag & ND_GSS)
2607                 exp->nes_exflag &= ~MNT_EXPORTANON;
2608
2609         /*
2610          * Check to see if the operation is allowed for this security flavor.
2611          * RFC2623 suggests that the NFSv3 Fsinfo RPC be allowed to
2612          * AUTH_NONE or AUTH_SYS for file systems requiring RPCSEC_GSS.
2613          * Also, allow Secinfo, so that it can acquire the correct flavor(s).
2614          */
2615         if (nfsvno_testexp(nd, exp) &&
2616             nd->nd_procnum != NFSV4OP_SECINFO &&
2617             nd->nd_procnum != NFSPROC_FSINFO) {
2618                 if (nd->nd_flag & ND_NFSV4)
2619                         error = NFSERR_WRONGSEC;
2620                 else
2621                         error = (NFSERR_AUTHERR | AUTH_TOOWEAK);
2622                 goto out;
2623         }
2624
2625         /*
2626          * Check to see if the file system is exported V4 only.
2627          */
2628         if (NFSVNO_EXV4ONLY(exp) && !(nd->nd_flag & ND_NFSV4)) {
2629                 error = NFSERR_PROGNOTV4;
2630                 goto out;
2631         }
2632
2633         /*
2634          * Now, map the user credentials.
2635          * (Note that ND_AUTHNONE will only be set for an NFSv3
2636          *  Fsinfo RPC. If set for anything else, this code might need
2637          *  to change.)
2638          */
2639         if (NFSVNO_EXPORTED(exp) &&
2640             ((!(nd->nd_flag & ND_GSS) && nd->nd_cred->cr_uid == 0) ||
2641              NFSVNO_EXPORTANON(exp) ||
2642              (nd->nd_flag & ND_AUTHNONE))) {
2643                 nd->nd_cred->cr_uid = credanon->cr_uid;
2644                 nd->nd_cred->cr_gid = credanon->cr_gid;
2645                 crsetgroups(nd->nd_cred, credanon->cr_ngroups,
2646                     credanon->cr_groups);
2647         }
2648
2649 out:
2650         NFSEXITCODE2(error, nd);
2651         return (error);
2652 }
2653
2654 /*
2655  * Check exports.
2656  */
2657 int
2658 nfsvno_checkexp(struct mount *mp, struct sockaddr *nam, struct nfsexstuff *exp,
2659     struct ucred **credp)
2660 {
2661         int i, error, *secflavors;
2662
2663         error = VFS_CHECKEXP(mp, nam, &exp->nes_exflag, credp,
2664             &exp->nes_numsecflavor, &secflavors);
2665         if (error) {
2666                 if (nfs_rootfhset) {
2667                         exp->nes_exflag = 0;
2668                         exp->nes_numsecflavor = 0;
2669                         error = 0;
2670                 }
2671         } else {
2672                 /* Copy the security flavors. */
2673                 for (i = 0; i < exp->nes_numsecflavor; i++)
2674                         exp->nes_secflavors[i] = secflavors[i];
2675         }
2676         NFSEXITCODE(error);
2677         return (error);
2678 }
2679
2680 /*
2681  * Get a vnode for a file handle and export stuff.
2682  */
2683 int
2684 nfsvno_fhtovp(struct mount *mp, fhandle_t *fhp, struct sockaddr *nam,
2685     int lktype, struct vnode **vpp, struct nfsexstuff *exp,
2686     struct ucred **credp)
2687 {
2688         int i, error, *secflavors;
2689
2690         *credp = NULL;
2691         exp->nes_numsecflavor = 0;
2692         error = VFS_FHTOVP(mp, &fhp->fh_fid, lktype, vpp);
2693         if (error != 0)
2694                 /* Make sure the server replies ESTALE to the client. */
2695                 error = ESTALE;
2696         if (nam && !error) {
2697                 error = VFS_CHECKEXP(mp, nam, &exp->nes_exflag, credp,
2698                     &exp->nes_numsecflavor, &secflavors);
2699                 if (error) {
2700                         if (nfs_rootfhset) {
2701                                 exp->nes_exflag = 0;
2702                                 exp->nes_numsecflavor = 0;
2703                                 error = 0;
2704                         } else {
2705                                 vput(*vpp);
2706                         }
2707                 } else {
2708                         /* Copy the security flavors. */
2709                         for (i = 0; i < exp->nes_numsecflavor; i++)
2710                                 exp->nes_secflavors[i] = secflavors[i];
2711                 }
2712         }
2713         NFSEXITCODE(error);
2714         return (error);
2715 }
2716
2717 /*
2718  * nfsd_fhtovp() - convert a fh to a vnode ptr
2719  *      - look up fsid in mount list (if not found ret error)
2720  *      - get vp and export rights by calling nfsvno_fhtovp()
2721  *      - if cred->cr_uid == 0 or MNT_EXPORTANON set it to credanon
2722  *        for AUTH_SYS
2723  *      - if mpp != NULL, return the mount point so that it can
2724  *        be used for vn_finished_write() by the caller
2725  */
2726 void
2727 nfsd_fhtovp(struct nfsrv_descript *nd, struct nfsrvfh *nfp, int lktype,
2728     struct vnode **vpp, struct nfsexstuff *exp,
2729     struct mount **mpp, int startwrite, struct thread *p)
2730 {
2731         struct mount *mp;
2732         struct ucred *credanon;
2733         fhandle_t *fhp;
2734
2735         fhp = (fhandle_t *)nfp->nfsrvfh_data;
2736         /*
2737          * Check for the special case of the nfsv4root_fh.
2738          */
2739         mp = vfs_busyfs(&fhp->fh_fsid);
2740         if (mpp != NULL)
2741                 *mpp = mp;
2742         if (mp == NULL) {
2743                 *vpp = NULL;
2744                 nd->nd_repstat = ESTALE;
2745                 goto out;
2746         }
2747
2748         if (startwrite) {
2749                 vn_start_write(NULL, mpp, V_WAIT);
2750                 if (lktype == LK_SHARED && !(MNT_SHARED_WRITES(mp)))
2751                         lktype = LK_EXCLUSIVE;
2752         }
2753         nd->nd_repstat = nfsvno_fhtovp(mp, fhp, nd->nd_nam, lktype, vpp, exp,
2754             &credanon);
2755         vfs_unbusy(mp);
2756
2757         /*
2758          * For NFSv4 without a pseudo root fs, unexported file handles
2759          * can be returned, so that Lookup works everywhere.
2760          */
2761         if (!nd->nd_repstat && exp->nes_exflag == 0 &&
2762             !(nd->nd_flag & ND_NFSV4)) {
2763                 vput(*vpp);
2764                 nd->nd_repstat = EACCES;
2765         }
2766
2767         /*
2768          * Personally, I've never seen any point in requiring a
2769          * reserved port#, since only in the rare case where the
2770          * clients are all boxes with secure system priviledges,
2771          * does it provide any enhanced security, but... some people
2772          * believe it to be useful and keep putting this code back in.
2773          * (There is also some "security checker" out there that
2774          *  complains if the nfs server doesn't enforce this.)
2775          * However, note the following:
2776          * RFC3530 (NFSv4) specifies that a reserved port# not be
2777          *      required.
2778          * RFC2623 recommends that, if a reserved port# is checked for,
2779          *      that there be a way to turn that off--> ifdef'd.
2780          */
2781 #ifdef NFS_REQRSVPORT
2782         if (!nd->nd_repstat) {
2783                 struct sockaddr_in *saddr;
2784                 struct sockaddr_in6 *saddr6;
2785
2786                 saddr = NFSSOCKADDR(nd->nd_nam, struct sockaddr_in *);
2787                 saddr6 = NFSSOCKADDR(nd->nd_nam, struct sockaddr_in6 *);
2788                 if (!(nd->nd_flag & ND_NFSV4) &&
2789                     ((saddr->sin_family == AF_INET &&
2790                       ntohs(saddr->sin_port) >= IPPORT_RESERVED) ||
2791                      (saddr6->sin6_family == AF_INET6 &&
2792                       ntohs(saddr6->sin6_port) >= IPPORT_RESERVED))) {
2793                         vput(*vpp);
2794                         nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
2795                 }
2796         }
2797 #endif  /* NFS_REQRSVPORT */
2798
2799         /*
2800          * Check/setup credentials.
2801          */
2802         if (!nd->nd_repstat) {
2803                 nd->nd_saveduid = nd->nd_cred->cr_uid;
2804                 nd->nd_repstat = nfsd_excred(nd, exp, credanon);
2805                 if (nd->nd_repstat)
2806                         vput(*vpp);
2807         }
2808         if (credanon != NULL)
2809                 crfree(credanon);
2810         if (nd->nd_repstat) {
2811                 if (startwrite)
2812                         vn_finished_write(mp);
2813                 *vpp = NULL;
2814                 if (mpp != NULL)
2815                         *mpp = NULL;
2816         }
2817
2818 out:
2819         NFSEXITCODE2(0, nd);
2820 }
2821
2822 /*
2823  * glue for fp.
2824  */
2825 static int
2826 fp_getfvp(struct thread *p, int fd, struct file **fpp, struct vnode **vpp)
2827 {
2828         struct filedesc *fdp;
2829         struct file *fp;
2830         int error = 0;
2831
2832         fdp = p->td_proc->p_fd;
2833         if (fd < 0 || fd >= fdp->fd_nfiles ||
2834             (fp = fdp->fd_ofiles[fd].fde_file) == NULL) {
2835                 error = EBADF;
2836                 goto out;
2837         }
2838         *fpp = fp;
2839
2840 out:
2841         NFSEXITCODE(error);
2842         return (error);
2843 }
2844
2845 /*
2846  * Called from nfssvc() to update the exports list. Just call
2847  * vfs_export(). This has to be done, since the v4 root fake fs isn't
2848  * in the mount list.
2849  */
2850 int
2851 nfsrv_v4rootexport(void *argp, struct ucred *cred, struct thread *p)
2852 {
2853         struct nfsex_args *nfsexargp = (struct nfsex_args *)argp;
2854         int error = 0;
2855         struct nameidata nd;
2856         fhandle_t fh;
2857
2858         error = vfs_export(&nfsv4root_mnt, &nfsexargp->export);
2859         if ((nfsexargp->export.ex_flags & MNT_DELEXPORT) != 0)
2860                 nfs_rootfhset = 0;
2861         else if (error == 0) {
2862                 if (nfsexargp->fspec == NULL) {
2863                         error = EPERM;
2864                         goto out;
2865                 }
2866                 /*
2867                  * If fspec != NULL, this is the v4root path.
2868                  */
2869                 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE,
2870                     nfsexargp->fspec, p);
2871                 if ((error = namei(&nd)) != 0)
2872                         goto out;
2873                 error = nfsvno_getfh(nd.ni_vp, &fh, p);
2874                 vrele(nd.ni_vp);
2875                 if (!error) {
2876                         nfs_rootfh.nfsrvfh_len = NFSX_MYFH;
2877                         NFSBCOPY((caddr_t)&fh,
2878                             nfs_rootfh.nfsrvfh_data,
2879                             sizeof (fhandle_t));
2880                         nfs_rootfhset = 1;
2881                 }
2882         }
2883
2884 out:
2885         NFSEXITCODE(error);
2886         return (error);
2887 }
2888
2889 /*
2890  * This function needs to test to see if the system is near its limit
2891  * for memory allocation via malloc() or mget() and return True iff
2892  * either of these resources are near their limit.
2893  * XXX (For now, this is just a stub.)
2894  */
2895 int nfsrv_testmalloclimit = 0;
2896 int
2897 nfsrv_mallocmget_limit(void)
2898 {
2899         static int printmesg = 0;
2900         static int testval = 1;
2901
2902         if (nfsrv_testmalloclimit && (testval++ % 1000) == 0) {
2903                 if ((printmesg++ % 100) == 0)
2904                         printf("nfsd: malloc/mget near limit\n");
2905                 return (1);
2906         }
2907         return (0);
2908 }
2909
2910 /*
2911  * BSD specific initialization of a mount point.
2912  */
2913 void
2914 nfsd_mntinit(void)
2915 {
2916         static int inited = 0;
2917
2918         if (inited)
2919                 return;
2920         inited = 1;
2921         nfsv4root_mnt.mnt_flag = (MNT_RDONLY | MNT_EXPORTED);
2922         TAILQ_INIT(&nfsv4root_mnt.mnt_nvnodelist);
2923         TAILQ_INIT(&nfsv4root_mnt.mnt_activevnodelist);
2924         nfsv4root_mnt.mnt_export = NULL;
2925         TAILQ_INIT(&nfsv4root_opt);
2926         TAILQ_INIT(&nfsv4root_newopt);
2927         nfsv4root_mnt.mnt_opt = &nfsv4root_opt;
2928         nfsv4root_mnt.mnt_optnew = &nfsv4root_newopt;
2929         nfsv4root_mnt.mnt_nvnodelistsize = 0;
2930         nfsv4root_mnt.mnt_activevnodelistsize = 0;
2931 }
2932
2933 /*
2934  * Get a vnode for a file handle, without checking exports, etc.
2935  */
2936 struct vnode *
2937 nfsvno_getvp(fhandle_t *fhp)
2938 {
2939         struct mount *mp;
2940         struct vnode *vp;
2941         int error;
2942
2943         mp = vfs_busyfs(&fhp->fh_fsid);
2944         if (mp == NULL)
2945                 return (NULL);
2946         error = VFS_FHTOVP(mp, &fhp->fh_fid, LK_EXCLUSIVE, &vp);
2947         vfs_unbusy(mp);
2948         if (error)
2949                 return (NULL);
2950         return (vp);
2951 }
2952
2953 /*
2954  * Do a local VOP_ADVLOCK().
2955  */
2956 int
2957 nfsvno_advlock(struct vnode *vp, int ftype, u_int64_t first,
2958     u_int64_t end, struct thread *td)
2959 {
2960         int error = 0;
2961         struct flock fl;
2962         u_int64_t tlen;
2963
2964         if (nfsrv_dolocallocks == 0)
2965                 goto out;
2966
2967         /* Check for VI_DOOMED here, so that VOP_ADVLOCK() isn't performed. */
2968         if ((vp->v_iflag & VI_DOOMED) != 0) {
2969                 error = EPERM;
2970                 goto out;
2971         }
2972
2973         fl.l_whence = SEEK_SET;
2974         fl.l_type = ftype;
2975         fl.l_start = (off_t)first;
2976         if (end == NFS64BITSSET) {
2977                 fl.l_len = 0;
2978         } else {
2979                 tlen = end - first;
2980                 fl.l_len = (off_t)tlen;
2981         }
2982         /*
2983          * For FreeBSD8, the l_pid and l_sysid must be set to the same
2984          * values for all calls, so that all locks will be held by the
2985          * nfsd server. (The nfsd server handles conflicts between the
2986          * various clients.)
2987          * Since an NFSv4 lockowner is a ClientID plus an array of up to 1024
2988          * bytes, so it can't be put in l_sysid.
2989          */
2990         if (nfsv4_sysid == 0)
2991                 nfsv4_sysid = nlm_acquire_next_sysid();
2992         fl.l_pid = (pid_t)0;
2993         fl.l_sysid = (int)nfsv4_sysid;
2994
2995         NFSVOPUNLOCK(vp, 0);
2996         if (ftype == F_UNLCK)
2997                 error = VOP_ADVLOCK(vp, (caddr_t)td->td_proc, F_UNLCK, &fl,
2998                     (F_POSIX | F_REMOTE));
2999         else
3000                 error = VOP_ADVLOCK(vp, (caddr_t)td->td_proc, F_SETLK, &fl,
3001                     (F_POSIX | F_REMOTE));
3002         NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
3003
3004 out:
3005         NFSEXITCODE(error);
3006         return (error);
3007 }
3008
3009 /*
3010  * Check the nfsv4 root exports.
3011  */
3012 int
3013 nfsvno_v4rootexport(struct nfsrv_descript *nd)
3014 {
3015         struct ucred *credanon;
3016         int exflags, error = 0, numsecflavor, *secflavors, i;
3017
3018         error = vfs_stdcheckexp(&nfsv4root_mnt, nd->nd_nam, &exflags,
3019             &credanon, &numsecflavor, &secflavors);
3020         if (error) {
3021                 error = NFSERR_PROGUNAVAIL;
3022                 goto out;
3023         }
3024         if (credanon != NULL)
3025                 crfree(credanon);
3026         for (i = 0; i < numsecflavor; i++) {
3027                 if (secflavors[i] == AUTH_SYS)
3028                         nd->nd_flag |= ND_EXAUTHSYS;
3029                 else if (secflavors[i] == RPCSEC_GSS_KRB5)
3030                         nd->nd_flag |= ND_EXGSS;
3031                 else if (secflavors[i] == RPCSEC_GSS_KRB5I)
3032                         nd->nd_flag |= ND_EXGSSINTEGRITY;
3033                 else if (secflavors[i] == RPCSEC_GSS_KRB5P)
3034                         nd->nd_flag |= ND_EXGSSPRIVACY;
3035         }
3036
3037 out:
3038         NFSEXITCODE(error);
3039         return (error);
3040 }
3041
3042 /*
3043  * Nfs server psuedo system call for the nfsd's
3044  */
3045 /*
3046  * MPSAFE
3047  */
3048 static int
3049 nfssvc_nfsd(struct thread *td, struct nfssvc_args *uap)
3050 {
3051         struct file *fp;
3052         struct nfsd_addsock_args sockarg;
3053         struct nfsd_nfsd_args nfsdarg;
3054         cap_rights_t rights;
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                 error = fget(td, sockarg.sock,
3067                     cap_rights_init(&rights, CAP_SOCK_SERVER), &fp);
3068                 if (error != 0)
3069                         goto out;
3070                 if (fp->f_type != DTYPE_SOCKET) {
3071                         fdrop(fp, td);
3072                         error = EPERM;
3073                         goto out;
3074                 }
3075                 error = nfsrvd_addsock(fp);
3076                 fdrop(fp, td);
3077         } else if (uap->flag & NFSSVC_NFSDNFSD) {
3078                 if (uap->argp == NULL) {
3079                         error = EINVAL;
3080                         goto out;
3081                 }
3082                 error = copyin(uap->argp, (caddr_t)&nfsdarg,
3083                     sizeof (nfsdarg));
3084                 if (error)
3085                         goto out;
3086                 error = nfsrvd_nfsd(td, &nfsdarg);
3087         } else {
3088                 error = nfssvc_srvcall(td, uap, td->td_ucred);
3089         }
3090
3091 out:
3092         NFSEXITCODE(error);
3093         return (error);
3094 }
3095
3096 static int
3097 nfssvc_srvcall(struct thread *p, struct nfssvc_args *uap, struct ucred *cred)
3098 {
3099         struct nfsex_args export;
3100         struct file *fp = NULL;
3101         int stablefd, len;
3102         struct nfsd_clid adminrevoke;
3103         struct nfsd_dumplist dumplist;
3104         struct nfsd_dumpclients *dumpclients;
3105         struct nfsd_dumplocklist dumplocklist;
3106         struct nfsd_dumplocks *dumplocks;
3107         struct nameidata nd;
3108         vnode_t vp;
3109         int error = EINVAL, igotlock;
3110         struct proc *procp;
3111         static int suspend_nfsd = 0;
3112
3113         if (uap->flag & NFSSVC_PUBLICFH) {
3114                 NFSBZERO((caddr_t)&nfs_pubfh.nfsrvfh_data,
3115                     sizeof (fhandle_t));
3116                 error = copyin(uap->argp,
3117                     &nfs_pubfh.nfsrvfh_data, sizeof (fhandle_t));
3118                 if (!error)
3119                         nfs_pubfhset = 1;
3120         } else if (uap->flag & NFSSVC_V4ROOTEXPORT) {
3121                 error = copyin(uap->argp,(caddr_t)&export,
3122                     sizeof (struct nfsex_args));
3123                 if (!error)
3124                         error = nfsrv_v4rootexport(&export, cred, p);
3125         } else if (uap->flag & NFSSVC_NOPUBLICFH) {
3126                 nfs_pubfhset = 0;
3127                 error = 0;
3128         } else if (uap->flag & NFSSVC_STABLERESTART) {
3129                 error = copyin(uap->argp, (caddr_t)&stablefd,
3130                     sizeof (int));
3131                 if (!error)
3132                         error = fp_getfvp(p, stablefd, &fp, &vp);
3133                 if (!error && (NFSFPFLAG(fp) & (FREAD | FWRITE)) != (FREAD | FWRITE))
3134                         error = EBADF;
3135                 if (!error && newnfs_numnfsd != 0)
3136                         error = EPERM;
3137                 if (!error) {
3138                         nfsrv_stablefirst.nsf_fp = fp;
3139                         nfsrv_setupstable(p);
3140                 }
3141         } else if (uap->flag & NFSSVC_ADMINREVOKE) {
3142                 error = copyin(uap->argp, (caddr_t)&adminrevoke,
3143                     sizeof (struct nfsd_clid));
3144                 if (!error)
3145                         error = nfsrv_adminrevoke(&adminrevoke, p);
3146         } else if (uap->flag & NFSSVC_DUMPCLIENTS) {
3147                 error = copyin(uap->argp, (caddr_t)&dumplist,
3148                     sizeof (struct nfsd_dumplist));
3149                 if (!error && (dumplist.ndl_size < 1 ||
3150                         dumplist.ndl_size > NFSRV_MAXDUMPLIST))
3151                         error = EPERM;
3152                 if (!error) {
3153                     len = sizeof (struct nfsd_dumpclients) * dumplist.ndl_size;
3154                     dumpclients = (struct nfsd_dumpclients *)malloc(len,
3155                         M_TEMP, M_WAITOK);
3156                     nfsrv_dumpclients(dumpclients, dumplist.ndl_size);
3157                     error = copyout(dumpclients,
3158                         CAST_USER_ADDR_T(dumplist.ndl_list), len);
3159                     free((caddr_t)dumpclients, M_TEMP);
3160                 }
3161         } else if (uap->flag & NFSSVC_DUMPLOCKS) {
3162                 error = copyin(uap->argp, (caddr_t)&dumplocklist,
3163                     sizeof (struct nfsd_dumplocklist));
3164                 if (!error && (dumplocklist.ndllck_size < 1 ||
3165                         dumplocklist.ndllck_size > NFSRV_MAXDUMPLIST))
3166                         error = EPERM;
3167                 if (!error)
3168                         error = nfsrv_lookupfilename(&nd,
3169                                 dumplocklist.ndllck_fname, p);
3170                 if (!error) {
3171                         len = sizeof (struct nfsd_dumplocks) *
3172                                 dumplocklist.ndllck_size;
3173                         dumplocks = (struct nfsd_dumplocks *)malloc(len,
3174                                 M_TEMP, M_WAITOK);
3175                         nfsrv_dumplocks(nd.ni_vp, dumplocks,
3176                             dumplocklist.ndllck_size, p);
3177                         vput(nd.ni_vp);
3178                         error = copyout(dumplocks,
3179                             CAST_USER_ADDR_T(dumplocklist.ndllck_list), len);
3180                         free((caddr_t)dumplocks, M_TEMP);
3181                 }
3182         } else if (uap->flag & NFSSVC_BACKUPSTABLE) {
3183                 procp = p->td_proc;
3184                 PROC_LOCK(procp);
3185                 nfsd_master_pid = procp->p_pid;
3186                 bcopy(procp->p_comm, nfsd_master_comm, MAXCOMLEN + 1);
3187                 nfsd_master_start = procp->p_stats->p_start;
3188                 nfsd_master_proc = procp;
3189                 PROC_UNLOCK(procp);
3190         } else if ((uap->flag & NFSSVC_SUSPENDNFSD) != 0) {
3191                 NFSLOCKV4ROOTMUTEX();
3192                 if (suspend_nfsd == 0) {
3193                         /* Lock out all nfsd threads */
3194                         do {
3195                                 igotlock = nfsv4_lock(&nfsd_suspend_lock, 1,
3196                                     NULL, NFSV4ROOTLOCKMUTEXPTR, NULL);
3197                         } while (igotlock == 0 && suspend_nfsd == 0);
3198                         suspend_nfsd = 1;
3199                 }
3200                 NFSUNLOCKV4ROOTMUTEX();
3201                 error = 0;
3202         } else if ((uap->flag & NFSSVC_RESUMENFSD) != 0) {
3203                 NFSLOCKV4ROOTMUTEX();
3204                 if (suspend_nfsd != 0) {
3205                         nfsv4_unlock(&nfsd_suspend_lock, 0);
3206                         suspend_nfsd = 0;
3207                 }
3208                 NFSUNLOCKV4ROOTMUTEX();
3209                 error = 0;
3210         }
3211
3212         NFSEXITCODE(error);
3213         return (error);
3214 }
3215
3216 /*
3217  * Check exports.
3218  * Returns 0 if ok, 1 otherwise.
3219  */
3220 int
3221 nfsvno_testexp(struct nfsrv_descript *nd, struct nfsexstuff *exp)
3222 {
3223         int i;
3224
3225         /*
3226          * This seems odd, but allow the case where the security flavor
3227          * list is empty. This happens when NFSv4 is traversing non-exported
3228          * file systems. Exported file systems should always have a non-empty
3229          * security flavor list.
3230          */
3231         if (exp->nes_numsecflavor == 0)
3232                 return (0);
3233
3234         for (i = 0; i < exp->nes_numsecflavor; i++) {
3235                 /*
3236                  * The tests for privacy and integrity must be first,
3237                  * since ND_GSS is set for everything but AUTH_SYS.
3238                  */
3239                 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5P &&
3240                     (nd->nd_flag & ND_GSSPRIVACY))
3241                         return (0);
3242                 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5I &&
3243                     (nd->nd_flag & ND_GSSINTEGRITY))
3244                         return (0);
3245                 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5 &&
3246                     (nd->nd_flag & ND_GSS))
3247                         return (0);
3248                 if (exp->nes_secflavors[i] == AUTH_SYS &&
3249                     (nd->nd_flag & ND_GSS) == 0)
3250                         return (0);
3251         }
3252         return (1);
3253 }
3254
3255 /*
3256  * Calculate a hash value for the fid in a file handle.
3257  */
3258 uint32_t
3259 nfsrv_hashfh(fhandle_t *fhp)
3260 {
3261         uint32_t hashval;
3262
3263         hashval = hash32_buf(&fhp->fh_fid, sizeof(struct fid), 0);
3264         return (hashval);
3265 }
3266
3267 /*
3268  * Calculate a hash value for the sessionid.
3269  */
3270 uint32_t
3271 nfsrv_hashsessionid(uint8_t *sessionid)
3272 {
3273         uint32_t hashval;
3274
3275         hashval = hash32_buf(sessionid, NFSX_V4SESSIONID, 0);
3276         return (hashval);
3277 }
3278
3279 /*
3280  * Signal the userland master nfsd to backup the stable restart file.
3281  */
3282 void
3283 nfsrv_backupstable(void)
3284 {
3285         struct proc *procp;
3286
3287         if (nfsd_master_proc != NULL) {
3288                 procp = pfind(nfsd_master_pid);
3289                 /* Try to make sure it is the correct process. */
3290                 if (procp == nfsd_master_proc &&
3291                     procp->p_stats->p_start.tv_sec ==
3292                     nfsd_master_start.tv_sec &&
3293                     procp->p_stats->p_start.tv_usec ==
3294                     nfsd_master_start.tv_usec &&
3295                     strcmp(procp->p_comm, nfsd_master_comm) == 0)
3296                         kern_psignal(procp, SIGUSR2);
3297                 else
3298                         nfsd_master_proc = NULL;
3299
3300                 if (procp != NULL)
3301                         PROC_UNLOCK(procp);
3302         }
3303 }
3304
3305 extern int (*nfsd_call_nfsd)(struct thread *, struct nfssvc_args *);
3306
3307 /*
3308  * Called once to initialize data structures...
3309  */
3310 static int
3311 nfsd_modevent(module_t mod, int type, void *data)
3312 {
3313         int error = 0, i;
3314         static int loaded = 0;
3315
3316         switch (type) {
3317         case MOD_LOAD:
3318                 if (loaded)
3319                         goto out;
3320                 newnfs_portinit();
3321                 for (i = 0; i < NFSRVCACHE_HASHSIZE; i++) {
3322                         snprintf(nfsrchash_table[i].lock_name,
3323                             sizeof(nfsrchash_table[i].lock_name), "nfsrc_tcp%d",
3324                             i);
3325                         mtx_init(&nfsrchash_table[i].mtx,
3326                             nfsrchash_table[i].lock_name, NULL, MTX_DEF);
3327                         snprintf(nfsrcahash_table[i].lock_name,
3328                             sizeof(nfsrcahash_table[i].lock_name), "nfsrc_tcpa%d",
3329                             i);
3330                         mtx_init(&nfsrcahash_table[i].mtx,
3331                             nfsrcahash_table[i].lock_name, NULL, MTX_DEF);
3332                 }
3333                 mtx_init(&nfsrc_udpmtx, "nfs_udpcache_mutex", NULL, MTX_DEF);
3334                 mtx_init(&nfs_v4root_mutex, "nfs_v4root_mutex", NULL, MTX_DEF);
3335                 mtx_init(&nfsv4root_mnt.mnt_mtx, "struct mount mtx", NULL,
3336                     MTX_DEF);
3337                 for (i = 0; i < NFSSESSIONHASHSIZE; i++)
3338                         mtx_init(&nfssessionhash[i].mtx, "nfs_session_mutex",
3339                             NULL, MTX_DEF);
3340                 lockinit(&nfsv4root_mnt.mnt_explock, PVFS, "explock", 0, 0);
3341                 nfsrvd_initcache();
3342                 nfsd_init();
3343                 NFSD_LOCK();
3344                 nfsrvd_init(0);
3345                 NFSD_UNLOCK();
3346                 nfsd_mntinit();
3347 #ifdef VV_DISABLEDELEG
3348                 vn_deleg_ops.vndeleg_recall = nfsd_recalldelegation;
3349                 vn_deleg_ops.vndeleg_disable = nfsd_disabledelegation;
3350 #endif
3351                 nfsd_call_servertimer = nfsrv_servertimer;
3352                 nfsd_call_nfsd = nfssvc_nfsd;
3353                 loaded = 1;
3354                 break;
3355
3356         case MOD_UNLOAD:
3357                 if (newnfs_numnfsd != 0) {
3358                         error = EBUSY;
3359                         break;
3360                 }
3361
3362 #ifdef VV_DISABLEDELEG
3363                 vn_deleg_ops.vndeleg_recall = NULL;
3364                 vn_deleg_ops.vndeleg_disable = NULL;
3365 #endif
3366                 nfsd_call_servertimer = NULL;
3367                 nfsd_call_nfsd = NULL;
3368
3369                 /* Clean out all NFSv4 state. */
3370                 nfsrv_throwawayallstate(curthread);
3371
3372                 /* Clean the NFS server reply cache */
3373                 nfsrvd_cleancache();
3374
3375                 /* Free up the krpc server pool. */
3376                 if (nfsrvd_pool != NULL)
3377                         svcpool_destroy(nfsrvd_pool);
3378
3379                 /* and get rid of the locks */
3380                 for (i = 0; i < NFSRVCACHE_HASHSIZE; i++) {
3381                         mtx_destroy(&nfsrchash_table[i].mtx);
3382                         mtx_destroy(&nfsrcahash_table[i].mtx);
3383                 }
3384                 mtx_destroy(&nfsrc_udpmtx);
3385                 mtx_destroy(&nfs_v4root_mutex);
3386                 mtx_destroy(&nfsv4root_mnt.mnt_mtx);
3387                 for (i = 0; i < NFSSESSIONHASHSIZE; i++)
3388                         mtx_destroy(&nfssessionhash[i].mtx);
3389                 lockdestroy(&nfsv4root_mnt.mnt_explock);
3390                 loaded = 0;
3391                 break;
3392         default:
3393                 error = EOPNOTSUPP;
3394                 break;
3395         }
3396
3397 out:
3398         NFSEXITCODE(error);
3399         return (error);
3400 }
3401 static moduledata_t nfsd_mod = {
3402         "nfsd",
3403         nfsd_modevent,
3404         NULL,
3405 };
3406 DECLARE_MODULE(nfsd, nfsd_mod, SI_SUB_VFS, SI_ORDER_ANY);
3407
3408 /* So that loader and kldload(2) can find us, wherever we are.. */
3409 MODULE_VERSION(nfsd, 1);
3410 MODULE_DEPEND(nfsd, nfscommon, 1, 1, 1);
3411 MODULE_DEPEND(nfsd, nfslock, 1, 1, 1);
3412 MODULE_DEPEND(nfsd, nfslockd, 1, 1, 1);
3413 MODULE_DEPEND(nfsd, krpc, 1, 1, 1);
3414 MODULE_DEPEND(nfsd, nfssvc, 1, 1, 1);
3415