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