sys/fs/nfsserver/nfs_nfsdport.c

   1 /*-
   2  * Copyright (c) 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Rick Macklem at The University of Guelph.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 4. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  */
  33
  34 #include <sys/cdefs.h>
  35 __FBSDID("$FreeBSD$");
  36
  37 #include <sys/capability.h>
  38
  39 /*
  40  * Functions that perform the vfs operations required by the routines in
  41  * nfsd_serv.c. It is hoped that this change will make the server more
  42  * portable.
  43  */
  44
  45 #include <fs/nfs/nfsport.h>
  46 #include <sys/hash.h>
  47 #include <sys/sysctl.h>
  48 #include <nlm/nlm_prot.h>
  49 #include <nlm/nlm.h>
  50
  51 FEATURE(nfsd, "NFSv4 server");
  52
  53 extern u_int32_t newnfs_true, newnfs_false, newnfs_xdrneg1;
  54 extern int nfsrv_useacl;
  55 extern int newnfs_numnfsd;
  56 extern struct mount nfsv4root_mnt;
  57 extern struct nfsrv_stablefirst nfsrv_stablefirst;
  58 extern void (*nfsd_call_servertimer)(void);
  59 extern SVCPOOL  *nfsrvd_pool;
  60 struct vfsoptlist nfsv4root_opt, nfsv4root_newopt;
  61 NFSDLOCKMUTEX;
  62 struct mtx nfs_cache_mutex;
  63 struct mtx nfs_v4root_mutex;
  64 struct nfsrvfh nfs_rootfh, nfs_pubfh;
  65 int nfs_pubfhset = 0, nfs_rootfhset = 0;
  66 struct proc *nfsd_master_proc = NULL;
  67 static pid_t nfsd_master_pid = (pid_t)-1;
  68 static char nfsd_master_comm[MAXCOMLEN + 1];
  69 static struct timeval nfsd_master_start;
  70 static uint32_t nfsv4_sysid = 0;
  71
  72 static int nfssvc_srvcall(struct thread *, struct nfssvc_args *,
  73     struct ucred *);
  74
  75 int nfsrv_enable_crossmntpt = 1;
  76 static int nfs_commit_blks;
  77 static int nfs_commit_miss;
  78 extern int nfsrv_issuedelegs;
  79 extern int nfsrv_dolocallocks;
  80
  81 SYSCTL_NODE(_vfs, OID_AUTO, nfsd, CTLFLAG_RW, 0, "New NFS server");
  82 SYSCTL_INT(_vfs_nfsd, OID_AUTO, mirrormnt, CTLFLAG_RW,
  83     &nfsrv_enable_crossmntpt, 0, "Enable nfsd to cross mount points");
  84 SYSCTL_INT(_vfs_nfsd, OID_AUTO, commit_blks, CTLFLAG_RW, &nfs_commit_blks,
  85     0, "");
  86 SYSCTL_INT(_vfs_nfsd, OID_AUTO, commit_miss, CTLFLAG_RW, &nfs_commit_miss,
  87     0, "");
  88 SYSCTL_INT(_vfs_nfsd, OID_AUTO, issue_delegations, CTLFLAG_RW,
  89     &nfsrv_issuedelegs, 0, "Enable nfsd to issue delegations");
  90 SYSCTL_INT(_vfs_nfsd, OID_AUTO, enable_locallocks, CTLFLAG_RW,
  91     &nfsrv_dolocallocks, 0, "Enable nfsd to acquire local locks on files");
  92
  93 #define NUM_HEURISTIC           1017
  94 #define NHUSE_INIT              64
  95 #define NHUSE_INC               16
  96 #define NHUSE_MAX               2048
  97
  98 static struct nfsheur {
  99         struct vnode *nh_vp;    /* vp to match (unreferenced pointer) */
 100         off_t nh_nextr;         /* next offset for sequential detection */
 101         int nh_use;             /* use count for selection */
 102         int nh_seqcount;        /* heuristic */
 103 } nfsheur[NUM_HEURISTIC];
 104
 105
 106 /*
 107  * Get attributes into nfsvattr structure.
 108  */
 109 int
 110 nfsvno_getattr(struct vnode *vp, struct nfsvattr *nvap, struct ucred *cred,
 111     struct thread *p, int vpislocked)
 112 {
 113         int error, lockedit = 0;
 114
 115         if (vpislocked == 0) {
 116                 /*
 117                  * When vpislocked == 0, the vnode is either exclusively
 118                  * locked by this thread or not locked by this thread.
 119                  * As such, shared lock it, if not exclusively locked.
 120                  */
 121                 if (NFSVOPISLOCKED(vp) != LK_EXCLUSIVE) {
 122                         lockedit = 1;
 123                         NFSVOPLOCK(vp, LK_SHARED | LK_RETRY);
 124                 }
 125         }
 126         error = VOP_GETATTR(vp, &nvap->na_vattr, cred);
 127         if (lockedit != 0)
 128                 NFSVOPUNLOCK(vp, 0);
 129
 130         NFSEXITCODE(error);
 131         return (error);
 132 }
 133
 134 /*
 135  * Get a file handle for a vnode.
 136  */
 137 int
 138 nfsvno_getfh(struct vnode *vp, fhandle_t *fhp, struct thread *p)
 139 {
 140         int error;
 141
 142         NFSBZERO((caddr_t)fhp, sizeof(fhandle_t));
 143         fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid;
 144         error = VOP_VPTOFH(vp, &fhp->fh_fid);
 145
 146         NFSEXITCODE(error);
 147         return (error);
 148 }
 149
 150 /*
 151  * Perform access checking for vnodes obtained from file handles that would
 152  * refer to files already opened by a Unix client. You cannot just use
 153  * vn_writechk() and VOP_ACCESSX() for two reasons.
 154  * 1 - You must check for exported rdonly as well as MNT_RDONLY for the write
 155  *     case.
 156  * 2 - The owner is to be given access irrespective of mode bits for some
 157  *     operations, so that processes that chmod after opening a file don't
 158  *     break.
 159  */
 160 int
 161 nfsvno_accchk(struct vnode *vp, accmode_t accmode, struct ucred *cred,
 162     struct nfsexstuff *exp, struct thread *p, int override, int vpislocked,
 163     u_int32_t *supportedtypep)
 164 {
 165         struct vattr vattr;
 166         int error = 0, getret = 0;
 167
 168         if (vpislocked == 0) {
 169                 if (NFSVOPLOCK(vp, LK_SHARED) != 0) {
 170                         error = EPERM;
 171                         goto out;
 172                 }
 173         }
 174         if (accmode & VWRITE) {
 175                 /* Just vn_writechk() changed to check rdonly */
 176                 /*
 177                  * Disallow write attempts on read-only file systems;
 178                  * unless the file is a socket or a block or character
 179                  * device resident on the file system.
 180                  */
 181                 if (NFSVNO_EXRDONLY(exp) ||
 182                     (vp->v_mount->mnt_flag & MNT_RDONLY)) {
 183                         switch (vp->v_type) {
 184                         case VREG:
 185                         case VDIR:
 186                         case VLNK:
 187                                 error = EROFS;
 188                         default:
 189                                 break;
 190                         }
 191                 }
 192                 /*
 193                  * If there's shared text associated with
 194                  * the inode, try to free it up once.  If
 195                  * we fail, we can't allow writing.
 196                  */
 197                 if ((vp->v_vflag & VV_TEXT) != 0 && error == 0)
 198                         error = ETXTBSY;
 199         }
 200         if (error != 0) {
 201                 if (vpislocked == 0)
 202                         NFSVOPUNLOCK(vp, 0);
 203                 goto out;
 204         }
 205
 206         /*
 207          * Should the override still be applied when ACLs are enabled?
 208          */
 209         error = VOP_ACCESSX(vp, accmode, cred, p);
 210         if (error != 0 && (accmode & (VDELETE | VDELETE_CHILD))) {
 211                 /*
 212                  * Try again with VEXPLICIT_DENY, to see if the test for
 213                  * deletion is supported.
 214                  */
 215                 error = VOP_ACCESSX(vp, accmode | VEXPLICIT_DENY, cred, p);
 216                 if (error == 0) {
 217                         if (vp->v_type == VDIR) {
 218                                 accmode &= ~(VDELETE | VDELETE_CHILD);
 219                                 accmode |= VWRITE;
 220                                 error = VOP_ACCESSX(vp, accmode, cred, p);
 221                         } else if (supportedtypep != NULL) {
 222                                 *supportedtypep &= ~NFSACCESS_DELETE;
 223                         }
 224                 }
 225         }
 226
 227         /*
 228          * Allow certain operations for the owner (reads and writes
 229          * on files that are already open).
 230          */
 231         if (override != NFSACCCHK_NOOVERRIDE &&
 232             (error == EPERM || error == EACCES)) {
 233                 if (cred->cr_uid == 0 && (override & NFSACCCHK_ALLOWROOT))
 234                         error = 0;
 235                 else if (override & NFSACCCHK_ALLOWOWNER) {
 236                         getret = VOP_GETATTR(vp, &vattr, cred);
 237                         if (getret == 0 && cred->cr_uid == vattr.va_uid)
 238                                 error = 0;
 239                 }
 240         }
 241         if (vpislocked == 0)
 242                 NFSVOPUNLOCK(vp, 0);
 243
 244 out:
 245         NFSEXITCODE(error);
 246         return (error);
 247 }
 248
 249 /*
 250  * Set attribute(s) vnop.
 251  */
 252 int
 253 nfsvno_setattr(struct vnode *vp, struct nfsvattr *nvap, struct ucred *cred,
 254     struct thread *p, struct nfsexstuff *exp)
 255 {
 256         int error;
 257
 258         error = VOP_SETATTR(vp, &nvap->na_vattr, cred);
 259         NFSEXITCODE(error);
 260         return (error);
 261 }
 262
 263 /*
 264  * Set up nameidata for a lookup() call and do it
 265  * For the cases where we are crossing mount points
 266  * (looking up the public fh path or the v4 root path when
 267  *  not using a pseudo-root fs), set/release the Giant lock,
 268  * as required.
 269  */
 270 int
 271 nfsvno_namei(struct nfsrv_descript *nd, struct nameidata *ndp,
 272     struct vnode *dp, int islocked, struct nfsexstuff *exp, struct thread *p,
 273     struct vnode **retdirp)
 274 {
 275         struct componentname *cnp = &ndp->ni_cnd;
 276         int i;
 277         struct iovec aiov;
 278         struct uio auio;
 279         int lockleaf = (cnp->cn_flags & LOCKLEAF) != 0, linklen;
 280         int error = 0, crossmnt;
 281         char *cp;
 282
 283         *retdirp = NULL;
 284         cnp->cn_nameptr = cnp->cn_pnbuf;
 285         ndp->ni_strictrelative = 0;
 286         /*
 287          * Extract and set starting directory.
 288          */
 289         if (dp->v_type != VDIR) {
 290                 if (islocked)
 291                         vput(dp);
 292                 else
 293                         vrele(dp);
 294                 nfsvno_relpathbuf(ndp);
 295                 error = ENOTDIR;
 296                 goto out1;
 297         }
 298         if (islocked)
 299                 NFSVOPUNLOCK(dp, 0);
 300         VREF(dp);
 301         *retdirp = dp;
 302         if (NFSVNO_EXRDONLY(exp))
 303                 cnp->cn_flags |= RDONLY;
 304         ndp->ni_segflg = UIO_SYSSPACE;
 305         crossmnt = 1;
 306
 307         if (nd->nd_flag & ND_PUBLOOKUP) {
 308                 ndp->ni_loopcnt = 0;
 309                 if (cnp->cn_pnbuf[0] == '/') {
 310                         vrele(dp);
 311                         /*
 312                          * Check for degenerate pathnames here, since lookup()
 313                          * panics on them.
 314                          */
 315                         for (i = 1; i < ndp->ni_pathlen; i++)
 316                                 if (cnp->cn_pnbuf[i] != '/')
 317                                         break;
 318                         if (i == ndp->ni_pathlen) {
 319                                 error = NFSERR_ACCES;
 320                                 goto out;
 321                         }
 322                         dp = rootvnode;
 323                         VREF(dp);
 324                 }
 325         } else if ((nfsrv_enable_crossmntpt == 0 && NFSVNO_EXPORTED(exp)) ||
 326             (nd->nd_flag & ND_NFSV4) == 0) {
 327                 /*
 328                  * Only cross mount points for NFSv4 when doing a
 329                  * mount while traversing the file system above
 330                  * the mount point, unless nfsrv_enable_crossmntpt is set.
 331                  */
 332                 cnp->cn_flags |= NOCROSSMOUNT;
 333                 crossmnt = 0;
 334         }
 335
 336         /*
 337          * Initialize for scan, set ni_startdir and bump ref on dp again
 338          * becuase lookup() will dereference ni_startdir.
 339          */
 340
 341         cnp->cn_thread = p;
 342         ndp->ni_startdir = dp;
 343         ndp->ni_rootdir = rootvnode;
 344
 345         if (!lockleaf)
 346                 cnp->cn_flags |= LOCKLEAF;
 347         for (;;) {
 348                 cnp->cn_nameptr = cnp->cn_pnbuf;
 349                 /*
 350                  * Call lookup() to do the real work.  If an error occurs,
 351                  * ndp->ni_vp and ni_dvp are left uninitialized or NULL and
 352                  * we do not have to dereference anything before returning.
 353                  * In either case ni_startdir will be dereferenced and NULLed
 354                  * out.
 355                  */
 356                 error = lookup(ndp);
 357                 if (error)
 358                         break;
 359
 360                 /*
 361                  * Check for encountering a symbolic link.  Trivial
 362                  * termination occurs if no symlink encountered.
 363                  */
 364                 if ((cnp->cn_flags & ISSYMLINK) == 0) {
 365                         if ((cnp->cn_flags & (SAVENAME | SAVESTART)) == 0)
 366                                 nfsvno_relpathbuf(ndp);
 367                         if (ndp->ni_vp && !lockleaf)
 368                                 NFSVOPUNLOCK(ndp->ni_vp, 0);
 369                         break;
 370                 }
 371
 372                 /*
 373                  * Validate symlink
 374                  */
 375                 if ((cnp->cn_flags & LOCKPARENT) && ndp->ni_pathlen == 1)
 376                         NFSVOPUNLOCK(ndp->ni_dvp, 0);
 377                 if (!(nd->nd_flag & ND_PUBLOOKUP)) {
 378                         error = EINVAL;
 379                         goto badlink2;
 380                 }
 381
 382                 if (ndp->ni_loopcnt++ >= MAXSYMLINKS) {
 383                         error = ELOOP;
 384                         goto badlink2;
 385                 }
 386                 if (ndp->ni_pathlen > 1)
 387                         cp = uma_zalloc(namei_zone, M_WAITOK);
 388                 else
 389                         cp = cnp->cn_pnbuf;
 390                 aiov.iov_base = cp;
 391                 aiov.iov_len = MAXPATHLEN;
 392                 auio.uio_iov = &aiov;
 393                 auio.uio_iovcnt = 1;
 394                 auio.uio_offset = 0;
 395                 auio.uio_rw = UIO_READ;
 396                 auio.uio_segflg = UIO_SYSSPACE;
 397                 auio.uio_td = NULL;
 398                 auio.uio_resid = MAXPATHLEN;
 399                 error = VOP_READLINK(ndp->ni_vp, &auio, cnp->cn_cred);
 400                 if (error) {
 401                 badlink1:
 402                         if (ndp->ni_pathlen > 1)
 403                                 uma_zfree(namei_zone, cp);
 404                 badlink2:
 405                         vrele(ndp->ni_dvp);
 406                         vput(ndp->ni_vp);
 407                         break;
 408                 }
 409                 linklen = MAXPATHLEN - auio.uio_resid;
 410                 if (linklen == 0) {
 411                         error = ENOENT;
 412                         goto badlink1;
 413                 }
 414                 if (linklen + ndp->ni_pathlen >= MAXPATHLEN) {
 415                         error = ENAMETOOLONG;
 416                         goto badlink1;
 417                 }
 418
 419                 /*
 420                  * Adjust or replace path
 421                  */
 422                 if (ndp->ni_pathlen > 1) {
 423                         NFSBCOPY(ndp->ni_next, cp + linklen, ndp->ni_pathlen);
 424                         uma_zfree(namei_zone, cnp->cn_pnbuf);
 425                         cnp->cn_pnbuf = cp;
 426                 } else
 427                         cnp->cn_pnbuf[linklen] = '\0';
 428                 ndp->ni_pathlen += linklen;
 429
 430                 /*
 431                  * Cleanup refs for next loop and check if root directory
 432                  * should replace current directory.  Normally ni_dvp
 433                  * becomes the new base directory and is cleaned up when
 434                  * we loop.  Explicitly null pointers after invalidation
 435                  * to clarify operation.
 436                  */
 437                 vput(ndp->ni_vp);
 438                 ndp->ni_vp = NULL;
 439
 440                 if (cnp->cn_pnbuf[0] == '/') {
 441                         vrele(ndp->ni_dvp);
 442                         ndp->ni_dvp = ndp->ni_rootdir;
 443                         VREF(ndp->ni_dvp);
 444                 }
 445                 ndp->ni_startdir = ndp->ni_dvp;
 446                 ndp->ni_dvp = NULL;
 447         }
 448         if (!lockleaf)
 449                 cnp->cn_flags &= ~LOCKLEAF;
 450
 451 out:
 452         if (error) {
 453                 uma_zfree(namei_zone, cnp->cn_pnbuf);
 454                 ndp->ni_vp = NULL;
 455                 ndp->ni_dvp = NULL;
 456                 ndp->ni_startdir = NULL;
 457                 cnp->cn_flags &= ~HASBUF;
 458         } else if ((ndp->ni_cnd.cn_flags & (WANTPARENT|LOCKPARENT)) == 0) {
 459                 ndp->ni_dvp = NULL;
 460         }
 461
 462 out1:
 463         NFSEXITCODE2(error, nd);
 464         return (error);
 465 }
 466
 467 /*
 468  * Set up a pathname buffer and return a pointer to it and, optionally
 469  * set a hash pointer.
 470  */
 471 void
 472 nfsvno_setpathbuf(struct nameidata *ndp, char **bufpp, u_long **hashpp)
 473 {
 474         struct componentname *cnp = &ndp->ni_cnd;
 475
 476         cnp->cn_flags |= (NOMACCHECK | HASBUF);
 477         cnp->cn_pnbuf = uma_zalloc(namei_zone, M_WAITOK);
 478         if (hashpp != NULL)
 479                 *hashpp = NULL;
 480         *bufpp = cnp->cn_pnbuf;
 481 }
 482
 483 /*
 484  * Release the above path buffer, if not released by nfsvno_namei().
 485  */
 486 void
 487 nfsvno_relpathbuf(struct nameidata *ndp)
 488 {
 489
 490         if ((ndp->ni_cnd.cn_flags & HASBUF) == 0)
 491                 panic("nfsrelpath");
 492         uma_zfree(namei_zone, ndp->ni_cnd.cn_pnbuf);
 493         ndp->ni_cnd.cn_flags &= ~HASBUF;
 494 }
 495
 496 /*
 497  * Readlink vnode op into an mbuf list.
 498  */
 499 int
 500 nfsvno_readlink(struct vnode *vp, struct ucred *cred, struct thread *p,
 501     struct mbuf **mpp, struct mbuf **mpendp, int *lenp)
 502 {
 503         struct iovec iv[(NFS_MAXPATHLEN+MLEN-1)/MLEN];
 504         struct iovec *ivp = iv;
 505         struct uio io, *uiop = &io;
 506         struct mbuf *mp, *mp2 = NULL, *mp3 = NULL;
 507         int i, len, tlen, error = 0;
 508
 509         len = 0;
 510         i = 0;
 511         while (len < NFS_MAXPATHLEN) {
 512                 NFSMGET(mp);
 513                 MCLGET(mp, M_WAIT);
 514                 mp->m_len = NFSMSIZ(mp);
 515                 if (len == 0) {
 516                         mp3 = mp2 = mp;
 517                 } else {
 518                         mp2->m_next = mp;
 519                         mp2 = mp;
 520                 }
 521                 if ((len + mp->m_len) > NFS_MAXPATHLEN) {
 522                         mp->m_len = NFS_MAXPATHLEN - len;
 523                         len = NFS_MAXPATHLEN;
 524                 } else {
 525                         len += mp->m_len;
 526                 }
 527                 ivp->iov_base = mtod(mp, caddr_t);
 528                 ivp->iov_len = mp->m_len;
 529                 i++;
 530                 ivp++;
 531         }
 532         uiop->uio_iov = iv;
 533         uiop->uio_iovcnt = i;
 534         uiop->uio_offset = 0;
 535         uiop->uio_resid = len;
 536         uiop->uio_rw = UIO_READ;
 537         uiop->uio_segflg = UIO_SYSSPACE;
 538         uiop->uio_td = NULL;
 539         error = VOP_READLINK(vp, uiop, cred);
 540         if (error) {
 541                 m_freem(mp3);
 542                 *lenp = 0;
 543                 goto out;
 544         }
 545         if (uiop->uio_resid > 0) {
 546                 len -= uiop->uio_resid;
 547                 tlen = NFSM_RNDUP(len);
 548                 nfsrv_adj(mp3, NFS_MAXPATHLEN - tlen, tlen - len);
 549         }
 550         *lenp = len;
 551         *mpp = mp3;
 552         *mpendp = mp;
 553
 554 out:
 555         NFSEXITCODE(error);
 556         return (error);
 557 }
 558
 559 /*
 560  * Read vnode op call into mbuf list.
 561  */
 562 int
 563 nfsvno_read(struct vnode *vp, off_t off, int cnt, struct ucred *cred,
 564     struct thread *p, struct mbuf **mpp, struct mbuf **mpendp)
 565 {
 566         struct mbuf *m;
 567         int i;
 568         struct iovec *iv;
 569         struct iovec *iv2;
 570         int error = 0, len, left, siz, tlen, ioflag = 0, hi, try = 32;
 571         struct mbuf *m2 = NULL, *m3;
 572         struct uio io, *uiop = &io;
 573         struct nfsheur *nh;
 574
 575         /*
 576          * Calculate seqcount for heuristic
 577          */
 578         /*
 579          * Locate best candidate
 580          */
 581
 582         hi = ((int)(vm_offset_t)vp / sizeof(struct vnode)) % NUM_HEURISTIC;
 583         nh = &nfsheur[hi];
 584
 585         while (try--) {
 586                 if (nfsheur[hi].nh_vp == vp) {
 587                         nh = &nfsheur[hi];
 588                         break;
 589                 }
 590                 if (nfsheur[hi].nh_use > 0)
 591                         --nfsheur[hi].nh_use;
 592                 hi = (hi + 1) % NUM_HEURISTIC;
 593                 if (nfsheur[hi].nh_use < nh->nh_use)
 594                         nh = &nfsheur[hi];
 595         }
 596
 597         if (nh->nh_vp != vp) {
 598                 nh->nh_vp = vp;
 599                 nh->nh_nextr = off;
 600                 nh->nh_use = NHUSE_INIT;
 601                 if (off == 0)
 602                         nh->nh_seqcount = 4;
 603                 else
 604                         nh->nh_seqcount = 1;
 605         }
 606
 607         /*
 608          * Calculate heuristic
 609          */
 610
 611         if ((off == 0 && nh->nh_seqcount > 0) || off == nh->nh_nextr) {
 612                 if (++nh->nh_seqcount > IO_SEQMAX)
 613                         nh->nh_seqcount = IO_SEQMAX;
 614         } else if (nh->nh_seqcount > 1) {
 615                 nh->nh_seqcount = 1;
 616         } else {
 617                 nh->nh_seqcount = 0;
 618         }
 619         nh->nh_use += NHUSE_INC;
 620         if (nh->nh_use > NHUSE_MAX)
 621                 nh->nh_use = NHUSE_MAX;
 622         ioflag |= nh->nh_seqcount << IO_SEQSHIFT;
 623
 624         len = left = NFSM_RNDUP(cnt);
 625         m3 = NULL;
 626         /*
 627          * Generate the mbuf list with the uio_iov ref. to it.
 628          */
 629         i = 0;
 630         while (left > 0) {
 631                 NFSMGET(m);
 632                 MCLGET(m, M_WAIT);
 633                 m->m_len = 0;
 634                 siz = min(M_TRAILINGSPACE(m), left);
 635                 left -= siz;
 636                 i++;
 637                 if (m3)
 638                         m2->m_next = m;
 639                 else
 640                         m3 = m;
 641                 m2 = m;
 642         }
 643         MALLOC(iv, struct iovec *, i * sizeof (struct iovec),
 644             M_TEMP, M_WAITOK);
 645         uiop->uio_iov = iv2 = iv;
 646         m = m3;
 647         left = len;
 648         i = 0;
 649         while (left > 0) {
 650                 if (m == NULL)
 651                         panic("nfsvno_read iov");
 652                 siz = min(M_TRAILINGSPACE(m), left);
 653                 if (siz > 0) {
 654                         iv->iov_base = mtod(m, caddr_t) + m->m_len;
 655                         iv->iov_len = siz;
 656                         m->m_len += siz;
 657                         left -= siz;
 658                         iv++;
 659                         i++;
 660                 }
 661                 m = m->m_next;
 662         }
 663         uiop->uio_iovcnt = i;
 664         uiop->uio_offset = off;
 665         uiop->uio_resid = len;
 666         uiop->uio_rw = UIO_READ;
 667         uiop->uio_segflg = UIO_SYSSPACE;
 668         error = VOP_READ(vp, uiop, IO_NODELOCKED | ioflag, cred);
 669         FREE((caddr_t)iv2, M_TEMP);
 670         if (error) {
 671                 m_freem(m3);
 672                 *mpp = NULL;
 673                 goto out;
 674         }
 675         tlen = len - uiop->uio_resid;
 676         cnt = cnt < tlen ? cnt : tlen;
 677         tlen = NFSM_RNDUP(cnt);
 678         if (tlen == 0) {
 679                 m_freem(m3);
 680                 m3 = NULL;
 681         } else if (len != tlen || tlen != cnt)
 682                 nfsrv_adj(m3, len - tlen, tlen - cnt);
 683         *mpp = m3;
 684         *mpendp = m2;
 685
 686 out:
 687         NFSEXITCODE(error);
 688         return (error);
 689 }
 690
 691 /*
 692  * Write vnode op from an mbuf list.
 693  */
 694 int
 695 nfsvno_write(struct vnode *vp, off_t off, int retlen, int cnt, int stable,
 696     struct mbuf *mp, char *cp, struct ucred *cred, struct thread *p)
 697 {
 698         struct iovec *ivp;
 699         int i, len;
 700         struct iovec *iv;
 701         int ioflags, error;
 702         struct uio io, *uiop = &io;
 703
 704         MALLOC(ivp, struct iovec *, cnt * sizeof (struct iovec), M_TEMP,
 705             M_WAITOK);
 706         uiop->uio_iov = iv = ivp;
 707         uiop->uio_iovcnt = cnt;
 708         i = mtod(mp, caddr_t) + mp->m_len - cp;
 709         len = retlen;
 710         while (len > 0) {
 711                 if (mp == NULL)
 712                         panic("nfsvno_write");
 713                 if (i > 0) {
 714                         i = min(i, len);
 715                         ivp->iov_base = cp;
 716                         ivp->iov_len = i;
 717                         ivp++;
 718                         len -= i;
 719                 }
 720                 mp = mp->m_next;
 721                 if (mp) {
 722                         i = mp->m_len;
 723                         cp = mtod(mp, caddr_t);
 724                 }
 725         }
 726
 727         if (stable == NFSWRITE_UNSTABLE)
 728                 ioflags = IO_NODELOCKED;
 729         else
 730                 ioflags = (IO_SYNC | IO_NODELOCKED);
 731         uiop->uio_resid = retlen;
 732         uiop->uio_rw = UIO_WRITE;
 733         uiop->uio_segflg = UIO_SYSSPACE;
 734         NFSUIOPROC(uiop, p);
 735         uiop->uio_offset = off;
 736         error = VOP_WRITE(vp, uiop, ioflags, cred);
 737         FREE((caddr_t)iv, M_TEMP);
 738
 739         NFSEXITCODE(error);
 740         return (error);
 741 }
 742
 743 /*
 744  * Common code for creating a regular file (plus special files for V2).
 745  */
 746 int
 747 nfsvno_createsub(struct nfsrv_descript *nd, struct nameidata *ndp,
 748     struct vnode **vpp, struct nfsvattr *nvap, int *exclusive_flagp,
 749     int32_t *cverf, NFSDEV_T rdev, struct thread *p, struct nfsexstuff *exp)
 750 {
 751         u_quad_t tempsize;
 752         int error;
 753
 754         error = nd->nd_repstat;
 755         if (!error && ndp->ni_vp == NULL) {
 756                 if (nvap->na_type == VREG || nvap->na_type == VSOCK) {
 757                         vrele(ndp->ni_startdir);
 758                         error = VOP_CREATE(ndp->ni_dvp,
 759                             &ndp->ni_vp, &ndp->ni_cnd, &nvap->na_vattr);
 760                         vput(ndp->ni_dvp);
 761                         nfsvno_relpathbuf(ndp);
 762                         if (!error) {
 763                                 if (*exclusive_flagp) {
 764                                         *exclusive_flagp = 0;
 765                                         NFSVNO_ATTRINIT(nvap);
 766                                         nvap->na_atime.tv_sec = cverf[0];
 767                                         nvap->na_atime.tv_nsec = cverf[1];
 768                                         error = VOP_SETATTR(ndp->ni_vp,
 769                                             &nvap->na_vattr, nd->nd_cred);
 770                                 }
 771                         }
 772                 /*
 773                  * NFS V2 Only. nfsrvd_mknod() does this for V3.
 774                  * (This implies, just get out on an error.)
 775                  */
 776                 } else if (nvap->na_type == VCHR || nvap->na_type == VBLK ||
 777                         nvap->na_type == VFIFO) {
 778                         if (nvap->na_type == VCHR && rdev == 0xffffffff)
 779                                 nvap->na_type = VFIFO;
 780                         if (nvap->na_type != VFIFO &&
 781                             (error = priv_check_cred(nd->nd_cred,
 782                              PRIV_VFS_MKNOD_DEV, 0))) {
 783                                 vrele(ndp->ni_startdir);
 784                                 nfsvno_relpathbuf(ndp);
 785                                 vput(ndp->ni_dvp);
 786                                 goto out;
 787                         }
 788                         nvap->na_rdev = rdev;
 789                         error = VOP_MKNOD(ndp->ni_dvp, &ndp->ni_vp,
 790                             &ndp->ni_cnd, &nvap->na_vattr);
 791                         vput(ndp->ni_dvp);
 792                         nfsvno_relpathbuf(ndp);
 793                         vrele(ndp->ni_startdir);
 794                         if (error)
 795                                 goto out;
 796                 } else {
 797                         vrele(ndp->ni_startdir);
 798                         nfsvno_relpathbuf(ndp);
 799                         vput(ndp->ni_dvp);
 800                         error = ENXIO;
 801                         goto out;
 802                 }
 803                 *vpp = ndp->ni_vp;
 804         } else {
 805                 /*
 806                  * Handle cases where error is already set and/or
 807                  * the file exists.
 808                  * 1 - clean up the lookup
 809                  * 2 - iff !error and na_size set, truncate it
 810                  */
 811                 vrele(ndp->ni_startdir);
 812                 nfsvno_relpathbuf(ndp);
 813                 *vpp = ndp->ni_vp;
 814                 if (ndp->ni_dvp == *vpp)
 815                         vrele(ndp->ni_dvp);
 816                 else
 817                         vput(ndp->ni_dvp);
 818                 if (!error && nvap->na_size != VNOVAL) {
 819                         error = nfsvno_accchk(*vpp, VWRITE,
 820                             nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
 821                             NFSACCCHK_VPISLOCKED, NULL);
 822                         if (!error) {
 823                                 tempsize = nvap->na_size;
 824                                 NFSVNO_ATTRINIT(nvap);
 825                                 nvap->na_size = tempsize;
 826                                 error = VOP_SETATTR(*vpp,
 827                                     &nvap->na_vattr, nd->nd_cred);
 828                         }
 829                 }
 830                 if (error)
 831                         vput(*vpp);
 832         }
 833
 834 out:
 835         NFSEXITCODE(error);
 836         return (error);
 837 }
 838
 839 /*
 840  * Do a mknod vnode op.
 841  */
 842 int
 843 nfsvno_mknod(struct nameidata *ndp, struct nfsvattr *nvap, struct ucred *cred,
 844     struct thread *p)
 845 {
 846         int error = 0;
 847         enum vtype vtyp;
 848
 849         vtyp = nvap->na_type;
 850         /*
 851          * Iff doesn't exist, create it.
 852          */
 853         if (ndp->ni_vp) {
 854                 vrele(ndp->ni_startdir);
 855                 nfsvno_relpathbuf(ndp);
 856                 vput(ndp->ni_dvp);
 857                 vrele(ndp->ni_vp);
 858                 error = EEXIST;
 859                 goto out;
 860         }
 861         if (vtyp != VCHR && vtyp != VBLK && vtyp != VSOCK && vtyp != VFIFO) {
 862                 vrele(ndp->ni_startdir);
 863                 nfsvno_relpathbuf(ndp);
 864                 vput(ndp->ni_dvp);
 865                 error = NFSERR_BADTYPE;
 866                 goto out;
 867         }
 868         if (vtyp == VSOCK) {
 869                 vrele(ndp->ni_startdir);
 870                 error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp,
 871                     &ndp->ni_cnd, &nvap->na_vattr);
 872                 vput(ndp->ni_dvp);
 873                 nfsvno_relpathbuf(ndp);
 874         } else {
 875                 if (nvap->na_type != VFIFO &&
 876                     (error = priv_check_cred(cred, PRIV_VFS_MKNOD_DEV, 0))) {
 877                         vrele(ndp->ni_startdir);
 878                         nfsvno_relpathbuf(ndp);
 879                         vput(ndp->ni_dvp);
 880                         goto out;
 881                 }
 882                 error = VOP_MKNOD(ndp->ni_dvp, &ndp->ni_vp,
 883                     &ndp->ni_cnd, &nvap->na_vattr);
 884                 vput(ndp->ni_dvp);
 885                 nfsvno_relpathbuf(ndp);
 886                 vrele(ndp->ni_startdir);
 887                 /*
 888                  * Since VOP_MKNOD returns the ni_vp, I can't
 889                  * see any reason to do the lookup.
 890                  */
 891         }
 892
 893 out:
 894         NFSEXITCODE(error);
 895         return (error);
 896 }
 897
 898 /*
 899  * Mkdir vnode op.
 900  */
 901 int
 902 nfsvno_mkdir(struct nameidata *ndp, struct nfsvattr *nvap, uid_t saved_uid,
 903     struct ucred *cred, struct thread *p, struct nfsexstuff *exp)
 904 {
 905         int error = 0;
 906
 907         if (ndp->ni_vp != NULL) {
 908                 if (ndp->ni_dvp == ndp->ni_vp)
 909                         vrele(ndp->ni_dvp);
 910                 else
 911                         vput(ndp->ni_dvp);
 912                 vrele(ndp->ni_vp);
 913                 nfsvno_relpathbuf(ndp);
 914                 error = EEXIST;
 915                 goto out;
 916         }
 917         error = VOP_MKDIR(ndp->ni_dvp, &ndp->ni_vp, &ndp->ni_cnd,
 918             &nvap->na_vattr);
 919         vput(ndp->ni_dvp);
 920         nfsvno_relpathbuf(ndp);
 921
 922 out:
 923         NFSEXITCODE(error);
 924         return (error);
 925 }
 926
 927 /*
 928  * symlink vnode op.
 929  */
 930 int
 931 nfsvno_symlink(struct nameidata *ndp, struct nfsvattr *nvap, char *pathcp,
 932     int pathlen, int not_v2, uid_t saved_uid, struct ucred *cred, struct thread *p,
 933     struct nfsexstuff *exp)
 934 {
 935         int error = 0;
 936
 937         if (ndp->ni_vp) {
 938                 vrele(ndp->ni_startdir);
 939                 nfsvno_relpathbuf(ndp);
 940                 if (ndp->ni_dvp == ndp->ni_vp)
 941                         vrele(ndp->ni_dvp);
 942                 else
 943                         vput(ndp->ni_dvp);
 944                 vrele(ndp->ni_vp);
 945                 error = EEXIST;
 946                 goto out;
 947         }
 948
 949         error = VOP_SYMLINK(ndp->ni_dvp, &ndp->ni_vp, &ndp->ni_cnd,
 950             &nvap->na_vattr, pathcp);
 951         vput(ndp->ni_dvp);
 952         vrele(ndp->ni_startdir);
 953         nfsvno_relpathbuf(ndp);
 954         /*
 955          * Although FreeBSD still had the lookup code in
 956          * it for 7/current, there doesn't seem to be any
 957          * point, since VOP_SYMLINK() returns the ni_vp.
 958          * Just vput it for v2.
 959          */
 960         if (!not_v2 && !error)
 961                 vput(ndp->ni_vp);
 962
 963 out:
 964         NFSEXITCODE(error);
 965         return (error);
 966 }
 967
 968 /*
 969  * Parse symbolic link arguments.
 970  * This function has an ugly side effect. It will MALLOC() an area for
 971  * the symlink and set iov_base to point to it, only if it succeeds.
 972  * So, if it returns with uiop->uio_iov->iov_base != NULL, that must
 973  * be FREE'd later.
 974  */
 975 int
 976 nfsvno_getsymlink(struct nfsrv_descript *nd, struct nfsvattr *nvap,
 977     struct thread *p, char **pathcpp, int *lenp)
 978 {
 979         u_int32_t *tl;
 980         char *pathcp = NULL;
 981         int error = 0, len;
 982         struct nfsv2_sattr *sp;
 983
 984         *pathcpp = NULL;
 985         *lenp = 0;
 986         if ((nd->nd_flag & ND_NFSV3) &&
 987             (error = nfsrv_sattr(nd, nvap, NULL, NULL, p)))
 988                 goto nfsmout;
 989         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 990         len = fxdr_unsigned(int, *tl);
 991         if (len > NFS_MAXPATHLEN || len <= 0) {
 992                 error = EBADRPC;
 993                 goto nfsmout;
 994         }
 995         MALLOC(pathcp, caddr_t, len + 1, M_TEMP, M_WAITOK);
 996         error = nfsrv_mtostr(nd, pathcp, len);
 997         if (error)
 998                 goto nfsmout;
 999         if (nd->nd_flag & ND_NFSV2) {
1000                 NFSM_DISSECT(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
1001                 nvap->na_mode = fxdr_unsigned(u_int16_t, sp->sa_mode);
1002         }
1003         *pathcpp = pathcp;
1004         *lenp = len;
1005         NFSEXITCODE2(0, nd);
1006         return (0);
1007 nfsmout:
1008         if (pathcp)
1009                 free(pathcp, M_TEMP);
1010         NFSEXITCODE2(error, nd);
1011         return (error);
1012 }
1013
1014 /*
1015  * Remove a non-directory object.
1016  */
1017 int
1018 nfsvno_removesub(struct nameidata *ndp, int is_v4, struct ucred *cred,
1019     struct thread *p, struct nfsexstuff *exp)
1020 {
1021         struct vnode *vp;
1022         int error = 0;
1023
1024         vp = ndp->ni_vp;
1025         if (vp->v_type == VDIR)
1026                 error = NFSERR_ISDIR;
1027         else if (is_v4)
1028                 error = nfsrv_checkremove(vp, 1, p);
1029         if (!error)
1030                 error = VOP_REMOVE(ndp->ni_dvp, vp, &ndp->ni_cnd);
1031         if (ndp->ni_dvp == vp)
1032                 vrele(ndp->ni_dvp);
1033         else
1034                 vput(ndp->ni_dvp);
1035         vput(vp);
1036         NFSEXITCODE(error);
1037         return (error);
1038 }
1039
1040 /*
1041  * Remove a directory.
1042  */
1043 int
1044 nfsvno_rmdirsub(struct nameidata *ndp, int is_v4, struct ucred *cred,
1045     struct thread *p, struct nfsexstuff *exp)
1046 {
1047         struct vnode *vp;
1048         int error = 0;
1049
1050         vp = ndp->ni_vp;
1051         if (vp->v_type != VDIR) {
1052                 error = ENOTDIR;
1053                 goto out;
1054         }
1055         /*
1056          * No rmdir "." please.
1057          */
1058         if (ndp->ni_dvp == vp) {
1059                 error = EINVAL;
1060                 goto out;
1061         }
1062         /*
1063          * The root of a mounted filesystem cannot be deleted.
1064          */
1065         if (vp->v_vflag & VV_ROOT)
1066                 error = EBUSY;
1067 out:
1068         if (!error)
1069                 error = VOP_RMDIR(ndp->ni_dvp, vp, &ndp->ni_cnd);
1070         if (ndp->ni_dvp == vp)
1071                 vrele(ndp->ni_dvp);
1072         else
1073                 vput(ndp->ni_dvp);
1074         vput(vp);
1075         NFSEXITCODE(error);
1076         return (error);
1077 }
1078
1079 /*
1080  * Rename vnode op.
1081  */
1082 int
1083 nfsvno_rename(struct nameidata *fromndp, struct nameidata *tondp,
1084     u_int32_t ndstat, u_int32_t ndflag, struct ucred *cred, struct thread *p)
1085 {
1086         struct vnode *fvp, *tvp, *tdvp;
1087         int error = 0;
1088
1089         fvp = fromndp->ni_vp;
1090         if (ndstat) {
1091                 vrele(fromndp->ni_dvp);
1092                 vrele(fvp);
1093                 error = ndstat;
1094                 goto out1;
1095         }
1096         tdvp = tondp->ni_dvp;
1097         tvp = tondp->ni_vp;
1098         if (tvp != NULL) {
1099                 if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
1100                         error = (ndflag & ND_NFSV2) ? EISDIR : EEXIST;
1101                         goto out;
1102                 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
1103                         error = (ndflag & ND_NFSV2) ? ENOTDIR : EEXIST;
1104                         goto out;
1105                 }
1106                 if (tvp->v_type == VDIR && tvp->v_mountedhere) {
1107                         error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
1108                         goto out;
1109                 }
1110
1111                 /*
1112                  * A rename to '.' or '..' results in a prematurely
1113                  * unlocked vnode on FreeBSD5, so I'm just going to fail that
1114                  * here.
1115                  */
1116                 if ((tondp->ni_cnd.cn_namelen == 1 &&
1117                      tondp->ni_cnd.cn_nameptr[0] == '.') ||
1118                     (tondp->ni_cnd.cn_namelen == 2 &&
1119                      tondp->ni_cnd.cn_nameptr[0] == '.' &&
1120                      tondp->ni_cnd.cn_nameptr[1] == '.')) {
1121                         error = EINVAL;
1122                         goto out;
1123                 }
1124         }
1125         if (fvp->v_type == VDIR && fvp->v_mountedhere) {
1126                 error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
1127                 goto out;
1128         }
1129         if (fvp->v_mount != tdvp->v_mount) {
1130                 error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
1131                 goto out;
1132         }
1133         if (fvp == tdvp) {
1134                 error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EINVAL;
1135                 goto out;
1136         }
1137         if (fvp == tvp) {
1138                 /*
1139                  * If source and destination are the same, there is nothing to
1140                  * do. Set error to -1 to indicate this.
1141                  */
1142                 error = -1;
1143                 goto out;
1144         }
1145         if (ndflag & ND_NFSV4) {
1146                 if (NFSVOPLOCK(fvp, LK_EXCLUSIVE) == 0) {
1147                         error = nfsrv_checkremove(fvp, 0, p);
1148                         NFSVOPUNLOCK(fvp, 0);
1149                 } else
1150                         error = EPERM;
1151                 if (tvp && !error)
1152                         error = nfsrv_checkremove(tvp, 1, p);
1153         } else {
1154                 /*
1155                  * For NFSv2 and NFSv3, try to get rid of the delegation, so
1156                  * that the NFSv4 client won't be confused by the rename.
1157                  * Since nfsd_recalldelegation() can only be called on an
1158                  * unlocked vnode at this point and fvp is the file that will
1159                  * still exist after the rename, just do fvp.
1160                  */
1161                 nfsd_recalldelegation(fvp, p);
1162         }
1163 out:
1164         if (!error) {
1165                 error = VOP_RENAME(fromndp->ni_dvp, fromndp->ni_vp,
1166                     &fromndp->ni_cnd, tondp->ni_dvp, tondp->ni_vp,
1167                     &tondp->ni_cnd);
1168         } else {
1169                 if (tdvp == tvp)
1170                         vrele(tdvp);
1171                 else
1172                         vput(tdvp);
1173                 if (tvp)
1174                         vput(tvp);
1175                 vrele(fromndp->ni_dvp);
1176                 vrele(fvp);
1177                 if (error == -1)
1178                         error = 0;
1179         }
1180         vrele(tondp->ni_startdir);
1181         nfsvno_relpathbuf(tondp);
1182 out1:
1183         vrele(fromndp->ni_startdir);
1184         nfsvno_relpathbuf(fromndp);
1185         NFSEXITCODE(error);
1186         return (error);
1187 }
1188
1189 /*
1190  * Link vnode op.
1191  */
1192 int
1193 nfsvno_link(struct nameidata *ndp, struct vnode *vp, struct ucred *cred,
1194     struct thread *p, struct nfsexstuff *exp)
1195 {
1196         struct vnode *xp;
1197         int error = 0;
1198
1199         xp = ndp->ni_vp;
1200         if (xp != NULL) {
1201                 error = EEXIST;
1202         } else {
1203                 xp = ndp->ni_dvp;
1204                 if (vp->v_mount != xp->v_mount)
1205                         error = EXDEV;
1206         }
1207         if (!error) {
1208                 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
1209                 if ((vp->v_iflag & VI_DOOMED) == 0)
1210                         error = VOP_LINK(ndp->ni_dvp, vp, &ndp->ni_cnd);
1211                 else
1212                         error = EPERM;
1213                 if (ndp->ni_dvp == vp)
1214                         vrele(ndp->ni_dvp);
1215                 else
1216                         vput(ndp->ni_dvp);
1217                 NFSVOPUNLOCK(vp, 0);
1218         } else {
1219                 if (ndp->ni_dvp == ndp->ni_vp)
1220                         vrele(ndp->ni_dvp);
1221                 else
1222                         vput(ndp->ni_dvp);
1223                 if (ndp->ni_vp)
1224                         vrele(ndp->ni_vp);
1225         }
1226         nfsvno_relpathbuf(ndp);
1227         NFSEXITCODE(error);
1228         return (error);
1229 }
1230
1231 /*
1232  * Do the fsync() appropriate for the commit.
1233  */
1234 int
1235 nfsvno_fsync(struct vnode *vp, u_int64_t off, int cnt, struct ucred *cred,
1236     struct thread *td)
1237 {
1238         int error = 0;
1239
1240         if (cnt > MAX_COMMIT_COUNT) {
1241                 /*
1242                  * Give up and do the whole thing
1243                  */
1244                 if (vp->v_object &&
1245                    (vp->v_object->flags & OBJ_MIGHTBEDIRTY)) {
1246                         VM_OBJECT_LOCK(vp->v_object);
1247                         vm_object_page_clean(vp->v_object, 0, 0, OBJPC_SYNC);
1248                         VM_OBJECT_UNLOCK(vp->v_object);
1249                 }
1250                 error = VOP_FSYNC(vp, MNT_WAIT, td);
1251         } else {
1252                 /*
1253                  * Locate and synchronously write any buffers that fall
1254                  * into the requested range.  Note:  we are assuming that
1255                  * f_iosize is a power of 2.
1256                  */
1257                 int iosize = vp->v_mount->mnt_stat.f_iosize;
1258                 int iomask = iosize - 1;
1259                 struct bufobj *bo;
1260                 daddr_t lblkno;
1261
1262                 /*
1263                  * Align to iosize boundry, super-align to page boundry.
1264                  */
1265                 if (off & iomask) {
1266                         cnt += off & iomask;
1267                         off &= ~(u_quad_t)iomask;
1268                 }
1269                 if (off & PAGE_MASK) {
1270                         cnt += off & PAGE_MASK;
1271                         off &= ~(u_quad_t)PAGE_MASK;
1272                 }
1273                 lblkno = off / iosize;
1274
1275                 if (vp->v_object &&
1276                    (vp->v_object->flags & OBJ_MIGHTBEDIRTY)) {
1277                         VM_OBJECT_LOCK(vp->v_object);
1278                         vm_object_page_clean(vp->v_object, off, off + cnt,
1279                             OBJPC_SYNC);
1280                         VM_OBJECT_UNLOCK(vp->v_object);
1281                 }
1282
1283                 bo = &vp->v_bufobj;
1284                 BO_LOCK(bo);
1285                 while (cnt > 0) {
1286                         struct buf *bp;
1287
1288                         /*
1289                          * If we have a buffer and it is marked B_DELWRI we
1290                          * have to lock and write it.  Otherwise the prior
1291                          * write is assumed to have already been committed.
1292                          *
1293                          * gbincore() can return invalid buffers now so we
1294                          * have to check that bit as well (though B_DELWRI
1295                          * should not be set if B_INVAL is set there could be
1296                          * a race here since we haven't locked the buffer).
1297                          */
1298                         if ((bp = gbincore(&vp->v_bufobj, lblkno)) != NULL) {
1299                                 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_SLEEPFAIL |
1300                                     LK_INTERLOCK, BO_MTX(bo)) == ENOLCK) {
1301                                         BO_LOCK(bo);
1302                                         continue; /* retry */
1303                                 }
1304                                 if ((bp->b_flags & (B_DELWRI|B_INVAL)) ==
1305                                     B_DELWRI) {
1306                                         bremfree(bp);
1307                                         bp->b_flags &= ~B_ASYNC;
1308                                         bwrite(bp);
1309                                         ++nfs_commit_miss;
1310                                 } else
1311                                         BUF_UNLOCK(bp);
1312                                 BO_LOCK(bo);
1313                         }
1314                         ++nfs_commit_blks;
1315                         if (cnt < iosize)
1316                                 break;
1317                         cnt -= iosize;
1318                         ++lblkno;
1319                 }
1320                 BO_UNLOCK(bo);
1321         }
1322         NFSEXITCODE(error);
1323         return (error);
1324 }
1325
1326 /*
1327  * Statfs vnode op.
1328  */
1329 int
1330 nfsvno_statfs(struct vnode *vp, struct statfs *sf)
1331 {
1332         int error;
1333
1334         error = VFS_STATFS(vp->v_mount, sf);
1335         if (error == 0) {
1336                 /*
1337                  * Since NFS handles these values as unsigned on the
1338                  * wire, there is no way to represent negative values,
1339                  * so set them to 0. Without this, they will appear
1340                  * to be very large positive values for clients like
1341                  * Solaris10.
1342                  */
1343                 if (sf->f_bavail < 0)
1344                         sf->f_bavail = 0;
1345                 if (sf->f_ffree < 0)
1346                         sf->f_ffree = 0;
1347         }
1348         NFSEXITCODE(error);
1349         return (error);
1350 }
1351
1352 /*
1353  * Do the vnode op stuff for Open. Similar to nfsvno_createsub(), but
1354  * must handle nfsrv_opencheck() calls after any other access checks.
1355  */
1356 void
1357 nfsvno_open(struct nfsrv_descript *nd, struct nameidata *ndp,
1358     nfsquad_t clientid, nfsv4stateid_t *stateidp, struct nfsstate *stp,
1359     int *exclusive_flagp, struct nfsvattr *nvap, int32_t *cverf, int create,
1360     NFSACL_T *aclp, nfsattrbit_t *attrbitp, struct ucred *cred, struct thread *p,
1361     struct nfsexstuff *exp, struct vnode **vpp)
1362 {
1363         struct vnode *vp = NULL;
1364         u_quad_t tempsize;
1365         struct nfsexstuff nes;
1366
1367         if (ndp->ni_vp == NULL)
1368                 nd->nd_repstat = nfsrv_opencheck(clientid,
1369                     stateidp, stp, NULL, nd, p, nd->nd_repstat);
1370         if (!nd->nd_repstat) {
1371                 if (ndp->ni_vp == NULL) {
1372                         vrele(ndp->ni_startdir);
1373                         nd->nd_repstat = VOP_CREATE(ndp->ni_dvp,
1374                             &ndp->ni_vp, &ndp->ni_cnd, &nvap->na_vattr);
1375                         vput(ndp->ni_dvp);
1376                         nfsvno_relpathbuf(ndp);
1377                         if (!nd->nd_repstat) {
1378                                 if (*exclusive_flagp) {
1379                                         *exclusive_flagp = 0;
1380                                         NFSVNO_ATTRINIT(nvap);
1381                                         nvap->na_atime.tv_sec = cverf[0];
1382                                         nvap->na_atime.tv_nsec = cverf[1];
1383                                         nd->nd_repstat = VOP_SETATTR(ndp->ni_vp,
1384                                             &nvap->na_vattr, cred);
1385                                 } else {
1386                                         nfsrv_fixattr(nd, ndp->ni_vp, nvap,
1387                                             aclp, p, attrbitp, exp);
1388                                 }
1389                         }
1390                         vp = ndp->ni_vp;
1391                 } else {
1392                         if (ndp->ni_startdir)
1393                                 vrele(ndp->ni_startdir);
1394                         nfsvno_relpathbuf(ndp);
1395                         vp = ndp->ni_vp;
1396                         if (create == NFSV4OPEN_CREATE) {
1397                                 if (ndp->ni_dvp == vp)
1398                                         vrele(ndp->ni_dvp);
1399                                 else
1400                                         vput(ndp->ni_dvp);
1401                         }
1402                         if (NFSVNO_ISSETSIZE(nvap) && vp->v_type == VREG) {
1403                                 if (ndp->ni_cnd.cn_flags & RDONLY)
1404                                         NFSVNO_SETEXRDONLY(&nes);
1405                                 else
1406                                         NFSVNO_EXINIT(&nes);
1407                                 nd->nd_repstat = nfsvno_accchk(vp,
1408                                     VWRITE, cred, &nes, p,
1409                                     NFSACCCHK_NOOVERRIDE,
1410                                     NFSACCCHK_VPISLOCKED, NULL);
1411                                 nd->nd_repstat = nfsrv_opencheck(clientid,
1412                                     stateidp, stp, vp, nd, p, nd->nd_repstat);
1413                                 if (!nd->nd_repstat) {
1414                                         tempsize = nvap->na_size;
1415                                         NFSVNO_ATTRINIT(nvap);
1416                                         nvap->na_size = tempsize;
1417                                         nd->nd_repstat = VOP_SETATTR(vp,
1418                                             &nvap->na_vattr, cred);
1419                                 }
1420                         } else if (vp->v_type == VREG) {
1421                                 nd->nd_repstat = nfsrv_opencheck(clientid,
1422                                     stateidp, stp, vp, nd, p, nd->nd_repstat);
1423                         }
1424                 }
1425         } else {
1426                 if (ndp->ni_cnd.cn_flags & HASBUF)
1427                         nfsvno_relpathbuf(ndp);
1428                 if (ndp->ni_startdir && create == NFSV4OPEN_CREATE) {
1429                         vrele(ndp->ni_startdir);
1430                         if (ndp->ni_dvp == ndp->ni_vp)
1431                                 vrele(ndp->ni_dvp);
1432                         else
1433                                 vput(ndp->ni_dvp);
1434                         if (ndp->ni_vp)
1435                                 vput(ndp->ni_vp);
1436                 }
1437         }
1438         *vpp = vp;
1439
1440         NFSEXITCODE2(0, nd);
1441 }
1442
1443 /*
1444  * Updates the file rev and sets the mtime and ctime
1445  * to the current clock time, returning the va_filerev and va_Xtime
1446  * values.
1447  */
1448 void
1449 nfsvno_updfilerev(struct vnode *vp, struct nfsvattr *nvap,
1450     struct ucred *cred, struct thread *p)
1451 {
1452         struct vattr va;
1453
1454         VATTR_NULL(&va);
1455         getnanotime(&va.va_mtime);
1456         (void) VOP_SETATTR(vp, &va, cred);
1457         (void) nfsvno_getattr(vp, nvap, cred, p, 1);
1458 }
1459
1460 /*
1461  * Glue routine to nfsv4_fillattr().
1462  */
1463 int
1464 nfsvno_fillattr(struct nfsrv_descript *nd, struct mount *mp, struct vnode *vp,
1465     struct nfsvattr *nvap, fhandle_t *fhp, int rderror, nfsattrbit_t *attrbitp,
1466     struct ucred *cred, struct thread *p, int isdgram, int reterr,
1467     int supports_nfsv4acls, int at_root, uint64_t mounted_on_fileno)
1468 {
1469         int error;
1470
1471         error = nfsv4_fillattr(nd, mp, vp, NULL, &nvap->na_vattr, fhp, rderror,
1472             attrbitp, cred, p, isdgram, reterr, supports_nfsv4acls, at_root,
1473             mounted_on_fileno);
1474         NFSEXITCODE2(0, nd);
1475         return (error);
1476 }
1477
1478 /* Since the Readdir vnode ops vary, put the entire functions in here. */
1479 /*
1480  * nfs readdir service
1481  * - mallocs what it thinks is enough to read
1482  *      count rounded up to a multiple of DIRBLKSIZ <= NFS_MAXREADDIR
1483  * - calls VOP_READDIR()
1484  * - loops around building the reply
1485  *      if the output generated exceeds count break out of loop
1486  *      The NFSM_CLGET macro is used here so that the reply will be packed
1487  *      tightly in mbuf clusters.
1488  * - it trims out records with d_fileno == 0
1489  *      this doesn't matter for Unix clients, but they might confuse clients
1490  *      for other os'.
1491  * - it trims out records with d_type == DT_WHT
1492  *      these cannot be seen through NFS (unless we extend the protocol)
1493  *     The alternate call nfsrvd_readdirplus() does lookups as well.
1494  * PS: The NFS protocol spec. does not clarify what the "count" byte
1495  *      argument is a count of.. just name strings and file id's or the
1496  *      entire reply rpc or ...
1497  *      I tried just file name and id sizes and it confused the Sun client,
1498  *      so I am using the full rpc size now. The "paranoia.." comment refers
1499  *      to including the status longwords that are not a part of the dir.
1500  *      "entry" structures, but are in the rpc.
1501  */
1502 int
1503 nfsrvd_readdir(struct nfsrv_descript *nd, int isdgram,
1504     struct vnode *vp, struct thread *p, struct nfsexstuff *exp)
1505 {
1506         struct dirent *dp;
1507         u_int32_t *tl;
1508         int dirlen;
1509         char *cpos, *cend, *rbuf;
1510         struct nfsvattr at;
1511         int nlen, error = 0, getret = 1;
1512         int siz, cnt, fullsiz, eofflag, ncookies;
1513         u_int64_t off, toff, verf;
1514         u_long *cookies = NULL, *cookiep;
1515         struct uio io;
1516         struct iovec iv;
1517         int not_zfs;
1518
1519         if (nd->nd_repstat) {
1520                 nfsrv_postopattr(nd, getret, &at);
1521                 goto out;
1522         }
1523         if (nd->nd_flag & ND_NFSV2) {
1524                 NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1525                 off = fxdr_unsigned(u_quad_t, *tl++);
1526         } else {
1527                 NFSM_DISSECT(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
1528                 off = fxdr_hyper(tl);
1529                 tl += 2;
1530                 verf = fxdr_hyper(tl);
1531                 tl += 2;
1532         }
1533         toff = off;
1534         cnt = fxdr_unsigned(int, *tl);
1535         if (cnt > NFS_SRVMAXDATA(nd) || cnt < 0)
1536                 cnt = NFS_SRVMAXDATA(nd);
1537         siz = ((cnt + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1));
1538         fullsiz = siz;
1539         if (nd->nd_flag & ND_NFSV3) {
1540                 nd->nd_repstat = getret = nfsvno_getattr(vp, &at, nd->nd_cred,
1541                     p, 1);
1542 #if 0
1543                 /*
1544                  * va_filerev is not sufficient as a cookie verifier,
1545                  * since it is not supposed to change when entries are
1546                  * removed/added unless that offset cookies returned to
1547                  * the client are no longer valid.
1548                  */
1549                 if (!nd->nd_repstat && toff && verf != at.na_filerev)
1550                         nd->nd_repstat = NFSERR_BAD_COOKIE;
1551 #endif
1552         }
1553         if (nd->nd_repstat == 0 && cnt == 0) {
1554                 if (nd->nd_flag & ND_NFSV2)
1555                         /* NFSv2 does not have NFSERR_TOOSMALL */
1556                         nd->nd_repstat = EPERM;
1557                 else
1558                         nd->nd_repstat = NFSERR_TOOSMALL;
1559         }
1560         if (!nd->nd_repstat)
1561                 nd->nd_repstat = nfsvno_accchk(vp, VEXEC,
1562                     nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
1563                     NFSACCCHK_VPISLOCKED, NULL);
1564         if (nd->nd_repstat) {
1565                 vput(vp);
1566                 if (nd->nd_flag & ND_NFSV3)
1567                         nfsrv_postopattr(nd, getret, &at);
1568                 goto out;
1569         }
1570         not_zfs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "zfs");
1571         MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
1572 again:
1573         eofflag = 0;
1574         if (cookies) {
1575                 free((caddr_t)cookies, M_TEMP);
1576                 cookies = NULL;
1577         }
1578
1579         iv.iov_base = rbuf;
1580         iv.iov_len = siz;
1581         io.uio_iov = &iv;
1582         io.uio_iovcnt = 1;
1583         io.uio_offset = (off_t)off;
1584         io.uio_resid = siz;
1585         io.uio_segflg = UIO_SYSSPACE;
1586         io.uio_rw = UIO_READ;
1587         io.uio_td = NULL;
1588         nd->nd_repstat = VOP_READDIR(vp, &io, nd->nd_cred, &eofflag, &ncookies,
1589             &cookies);
1590         off = (u_int64_t)io.uio_offset;
1591         if (io.uio_resid)
1592                 siz -= io.uio_resid;
1593
1594         if (!cookies && !nd->nd_repstat)
1595                 nd->nd_repstat = NFSERR_PERM;
1596         if (nd->nd_flag & ND_NFSV3) {
1597                 getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
1598                 if (!nd->nd_repstat)
1599                         nd->nd_repstat = getret;
1600         }
1601
1602         /*
1603          * Handles the failed cases. nd->nd_repstat == 0 past here.
1604          */
1605         if (nd->nd_repstat) {
1606                 vput(vp);
1607                 free((caddr_t)rbuf, M_TEMP);
1608                 if (cookies)
1609                         free((caddr_t)cookies, M_TEMP);
1610                 if (nd->nd_flag & ND_NFSV3)
1611                         nfsrv_postopattr(nd, getret, &at);
1612                 goto out;
1613         }
1614         /*
1615          * If nothing read, return eof
1616          * rpc reply
1617          */
1618         if (siz == 0) {
1619                 vput(vp);
1620                 if (nd->nd_flag & ND_NFSV2) {
1621                         NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1622                 } else {
1623                         nfsrv_postopattr(nd, getret, &at);
1624                         NFSM_BUILD(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
1625                         txdr_hyper(at.na_filerev, tl);
1626                         tl += 2;
1627                 }
1628                 *tl++ = newnfs_false;
1629                 *tl = newnfs_true;
1630                 FREE((caddr_t)rbuf, M_TEMP);
1631                 FREE((caddr_t)cookies, M_TEMP);
1632                 goto out;
1633         }
1634
1635         /*
1636          * Check for degenerate cases of nothing useful read.
1637          * If so go try again
1638          */
1639         cpos = rbuf;
1640         cend = rbuf + siz;
1641         dp = (struct dirent *)cpos;
1642         cookiep = cookies;
1643
1644         /*
1645          * For some reason FreeBSD's ufs_readdir() chooses to back the
1646          * directory offset up to a block boundary, so it is necessary to
1647          * skip over the records that precede the requested offset. This
1648          * requires the assumption that file offset cookies monotonically
1649          * increase.
1650          * Since the offset cookies don't monotonically increase for ZFS,
1651          * this is not done when ZFS is the file system.
1652          */
1653         while (cpos < cend && ncookies > 0 &&
1654             (dp->d_fileno == 0 || dp->d_type == DT_WHT ||
1655              (not_zfs != 0 && ((u_quad_t)(*cookiep)) <= toff))) {
1656                 cpos += dp->d_reclen;
1657                 dp = (struct dirent *)cpos;
1658                 cookiep++;
1659                 ncookies--;
1660         }
1661         if (cpos >= cend || ncookies == 0) {
1662                 siz = fullsiz;
1663                 toff = off;
1664                 goto again;
1665         }
1666         vput(vp);
1667
1668         /*
1669          * dirlen is the size of the reply, including all XDR and must
1670          * not exceed cnt. For NFSv2, RFC1094 didn't clearly indicate
1671          * if the XDR should be included in "count", but to be safe, we do.
1672          * (Include the two booleans at the end of the reply in dirlen now.)
1673          */
1674         if (nd->nd_flag & ND_NFSV3) {
1675                 nfsrv_postopattr(nd, getret, &at);
1676                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1677                 txdr_hyper(at.na_filerev, tl);
1678                 dirlen = NFSX_V3POSTOPATTR + NFSX_VERF + 2 * NFSX_UNSIGNED;
1679         } else {
1680                 dirlen = 2 * NFSX_UNSIGNED;
1681         }
1682
1683         /* Loop through the records and build reply */
1684         while (cpos < cend && ncookies > 0) {
1685                 nlen = dp->d_namlen;
1686                 if (dp->d_fileno != 0 && dp->d_type != DT_WHT &&
1687                         nlen <= NFS_MAXNAMLEN) {
1688                         if (nd->nd_flag & ND_NFSV3)
1689                                 dirlen += (6*NFSX_UNSIGNED + NFSM_RNDUP(nlen));
1690                         else
1691                                 dirlen += (4*NFSX_UNSIGNED + NFSM_RNDUP(nlen));
1692                         if (dirlen > cnt) {
1693                                 eofflag = 0;
1694                                 break;
1695                         }
1696
1697                         /*
1698                          * Build the directory record xdr from
1699                          * the dirent entry.
1700                          */
1701                         if (nd->nd_flag & ND_NFSV3) {
1702                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1703                                 *tl++ = newnfs_true;
1704                                 *tl++ = 0;
1705                         } else {
1706                                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1707                                 *tl++ = newnfs_true;
1708                         }
1709                         *tl = txdr_unsigned(dp->d_fileno);
1710                         (void) nfsm_strtom(nd, dp->d_name, nlen);
1711                         if (nd->nd_flag & ND_NFSV3) {
1712                                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1713                                 *tl++ = 0;
1714                         } else
1715                                 NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
1716                         *tl = txdr_unsigned(*cookiep);
1717                 }
1718                 cpos += dp->d_reclen;
1719                 dp = (struct dirent *)cpos;
1720                 cookiep++;
1721                 ncookies--;
1722         }
1723         if (cpos < cend)
1724                 eofflag = 0;
1725         NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1726         *tl++ = newnfs_false;
1727         if (eofflag)
1728                 *tl = newnfs_true;
1729         else
1730                 *tl = newnfs_false;
1731         FREE((caddr_t)rbuf, M_TEMP);
1732         FREE((caddr_t)cookies, M_TEMP);
1733
1734 out:
1735         NFSEXITCODE2(0, nd);
1736         return (0);
1737 nfsmout:
1738         vput(vp);
1739         NFSEXITCODE2(error, nd);
1740         return (error);
1741 }
1742
1743 /*
1744  * Readdirplus for V3 and Readdir for V4.
1745  */
1746 int
1747 nfsrvd_readdirplus(struct nfsrv_descript *nd, int isdgram,
1748     struct vnode *vp, struct thread *p, struct nfsexstuff *exp)
1749 {
1750         struct dirent *dp;
1751         u_int32_t *tl;
1752         int dirlen;
1753         char *cpos, *cend, *rbuf;
1754         struct vnode *nvp;
1755         fhandle_t nfh;
1756         struct nfsvattr nva, at, *nvap = &nva;
1757         struct mbuf *mb0, *mb1;
1758         struct nfsreferral *refp;
1759         int nlen, r, error = 0, getret = 1, usevget = 1;
1760         int siz, cnt, fullsiz, eofflag, ncookies, entrycnt;
1761         caddr_t bpos0, bpos1;
1762         u_int64_t off, toff, verf;
1763         u_long *cookies = NULL, *cookiep;
1764         nfsattrbit_t attrbits, rderrbits, savbits;
1765         struct uio io;
1766         struct iovec iv;
1767         struct componentname cn;
1768         int at_root, needs_unbusy, not_zfs, supports_nfsv4acls;
1769         struct mount *mp, *new_mp;
1770         uint64_t mounted_on_fileno;
1771
1772         if (nd->nd_repstat) {
1773                 nfsrv_postopattr(nd, getret, &at);
1774                 goto out;
1775         }
1776         NFSM_DISSECT(tl, u_int32_t *, 6 * NFSX_UNSIGNED);
1777         off = fxdr_hyper(tl);
1778         toff = off;
1779         tl += 2;
1780         verf = fxdr_hyper(tl);
1781         tl += 2;
1782         siz = fxdr_unsigned(int, *tl++);
1783         cnt = fxdr_unsigned(int, *tl);
1784
1785         /*
1786          * Use the server's maximum data transfer size as the upper bound
1787          * on reply datalen.
1788          */
1789         if (cnt > NFS_SRVMAXDATA(nd) || cnt < 0)
1790                 cnt = NFS_SRVMAXDATA(nd);
1791
1792         /*
1793          * siz is a "hint" of how much directory information (name, fileid,
1794          * cookie) should be in the reply. At least one client "hints" 0,
1795          * so I set it to cnt for that case. I also round it up to the
1796          * next multiple of DIRBLKSIZ.
1797          */
1798         if (siz <= 0)
1799                 siz = cnt;
1800         siz = ((siz + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1));
1801
1802         if (nd->nd_flag & ND_NFSV4) {
1803                 error = nfsrv_getattrbits(nd, &attrbits, NULL, NULL);
1804                 if (error)
1805                         goto nfsmout;
1806                 NFSSET_ATTRBIT(&savbits, &attrbits);
1807                 NFSCLRNOTFILLABLE_ATTRBIT(&attrbits);
1808                 NFSZERO_ATTRBIT(&rderrbits);
1809                 NFSSETBIT_ATTRBIT(&rderrbits, NFSATTRBIT_RDATTRERROR);
1810         } else {
1811                 NFSZERO_ATTRBIT(&attrbits);
1812         }
1813         fullsiz = siz;
1814         nd->nd_repstat = getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
1815         if (!nd->nd_repstat) {
1816             if (off && verf != at.na_filerev) {
1817                 /*
1818                  * va_filerev is not sufficient as a cookie verifier,
1819                  * since it is not supposed to change when entries are
1820                  * removed/added unless that offset cookies returned to
1821                  * the client are no longer valid.
1822                  */
1823 #if 0
1824                 if (nd->nd_flag & ND_NFSV4) {
1825                         nd->nd_repstat = NFSERR_NOTSAME;
1826                 } else {
1827                         nd->nd_repstat = NFSERR_BAD_COOKIE;
1828                 }
1829 #endif
1830             } else if ((nd->nd_flag & ND_NFSV4) && off == 0 && verf != 0) {
1831                 nd->nd_repstat = NFSERR_BAD_COOKIE;
1832             }
1833         }
1834         if (!nd->nd_repstat && vp->v_type != VDIR)
1835                 nd->nd_repstat = NFSERR_NOTDIR;
1836         if (!nd->nd_repstat && cnt == 0)
1837                 nd->nd_repstat = NFSERR_TOOSMALL;
1838         if (!nd->nd_repstat)
1839                 nd->nd_repstat = nfsvno_accchk(vp, VEXEC,
1840                     nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
1841                     NFSACCCHK_VPISLOCKED, NULL);
1842         if (nd->nd_repstat) {
1843                 vput(vp);
1844                 if (nd->nd_flag & ND_NFSV3)
1845                         nfsrv_postopattr(nd, getret, &at);
1846                 goto out;
1847         }
1848         not_zfs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "zfs");
1849
1850         MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
1851 again:
1852         eofflag = 0;
1853         if (cookies) {
1854                 free((caddr_t)cookies, M_TEMP);
1855                 cookies = NULL;
1856         }
1857
1858         iv.iov_base = rbuf;
1859         iv.iov_len = siz;
1860         io.uio_iov = &iv;
1861         io.uio_iovcnt = 1;
1862         io.uio_offset = (off_t)off;
1863         io.uio_resid = siz;
1864         io.uio_segflg = UIO_SYSSPACE;
1865         io.uio_rw = UIO_READ;
1866         io.uio_td = NULL;
1867         nd->nd_repstat = VOP_READDIR(vp, &io, nd->nd_cred, &eofflag, &ncookies,
1868             &cookies);
1869         off = (u_int64_t)io.uio_offset;
1870         if (io.uio_resid)
1871                 siz -= io.uio_resid;
1872
1873         getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
1874
1875         if (!cookies && !nd->nd_repstat)
1876                 nd->nd_repstat = NFSERR_PERM;
1877         if (!nd->nd_repstat)
1878                 nd->nd_repstat = getret;
1879         if (nd->nd_repstat) {
1880                 vput(vp);
1881                 if (cookies)
1882                         free((caddr_t)cookies, M_TEMP);
1883                 free((caddr_t)rbuf, M_TEMP);
1884                 if (nd->nd_flag & ND_NFSV3)
1885                         nfsrv_postopattr(nd, getret, &at);
1886                 goto out;
1887         }
1888         /*
1889          * If nothing read, return eof
1890          * rpc reply
1891          */
1892         if (siz == 0) {
1893                 vput(vp);
1894                 if (nd->nd_flag & ND_NFSV3)
1895                         nfsrv_postopattr(nd, getret, &at);
1896                 NFSM_BUILD(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
1897                 txdr_hyper(at.na_filerev, tl);
1898                 tl += 2;
1899                 *tl++ = newnfs_false;
1900                 *tl = newnfs_true;
1901                 free((caddr_t)cookies, M_TEMP);
1902                 free((caddr_t)rbuf, M_TEMP);
1903                 goto out;
1904         }
1905
1906         /*
1907          * Check for degenerate cases of nothing useful read.
1908          * If so go try again
1909          */
1910         cpos = rbuf;
1911         cend = rbuf + siz;
1912         dp = (struct dirent *)cpos;
1913         cookiep = cookies;
1914
1915         /*
1916          * For some reason FreeBSD's ufs_readdir() chooses to back the
1917          * directory offset up to a block boundary, so it is necessary to
1918          * skip over the records that precede the requested offset. This
1919          * requires the assumption that file offset cookies monotonically
1920          * increase.
1921          * Since the offset cookies don't monotonically increase for ZFS,
1922          * this is not done when ZFS is the file system.
1923          */
1924         while (cpos < cend && ncookies > 0 &&
1925           (dp->d_fileno == 0 || dp->d_type == DT_WHT ||
1926            (not_zfs != 0 && ((u_quad_t)(*cookiep)) <= toff) ||
1927            ((nd->nd_flag & ND_NFSV4) &&
1928             ((dp->d_namlen == 1 && dp->d_name[0] == '.') ||
1929              (dp->d_namlen==2 && dp->d_name[0]=='.' && dp->d_name[1]=='.'))))) {
1930                 cpos += dp->d_reclen;
1931                 dp = (struct dirent *)cpos;
1932                 cookiep++;
1933                 ncookies--;
1934         }
1935         if (cpos >= cend || ncookies == 0) {
1936                 siz = fullsiz;
1937                 toff = off;
1938                 goto again;
1939         }
1940
1941         /*
1942          * Busy the file system so that the mount point won't go away
1943          * and, as such, VFS_VGET() can be used safely.
1944          */
1945         mp = vp->v_mount;
1946         vfs_ref(mp);
1947         NFSVOPUNLOCK(vp, 0);
1948         nd->nd_repstat = vfs_busy(mp, 0);
1949         vfs_rel(mp);
1950         if (nd->nd_repstat != 0) {
1951                 vrele(vp);
1952                 free(cookies, M_TEMP);
1953                 free(rbuf, M_TEMP);
1954                 if (nd->nd_flag & ND_NFSV3)
1955                         nfsrv_postopattr(nd, getret, &at);
1956                 goto out;
1957         }
1958
1959         /*
1960          * Save this position, in case there is an error before one entry
1961          * is created.
1962          */
1963         mb0 = nd->nd_mb;
1964         bpos0 = nd->nd_bpos;
1965
1966         /*
1967          * Fill in the first part of the reply.
1968          * dirlen is the reply length in bytes and cannot exceed cnt.
1969          * (Include the two booleans at the end of the reply in dirlen now,
1970          *  so we recognize when we have exceeded cnt.)
1971          */
1972         if (nd->nd_flag & ND_NFSV3) {
1973                 dirlen = NFSX_V3POSTOPATTR + NFSX_VERF + 2 * NFSX_UNSIGNED;
1974                 nfsrv_postopattr(nd, getret, &at);
1975         } else {
1976                 dirlen = NFSX_VERF + 2 * NFSX_UNSIGNED;
1977         }
1978         NFSM_BUILD(tl, u_int32_t *, NFSX_VERF);
1979         txdr_hyper(at.na_filerev, tl);
1980
1981         /*
1982          * Save this position, in case there is an empty reply needed.
1983          */
1984         mb1 = nd->nd_mb;
1985         bpos1 = nd->nd_bpos;
1986
1987         /* Loop through the records and build reply */
1988         entrycnt = 0;
1989         while (cpos < cend && ncookies > 0 && dirlen < cnt) {
1990                 nlen = dp->d_namlen;
1991                 if (dp->d_fileno != 0 && dp->d_type != DT_WHT &&
1992                     nlen <= NFS_MAXNAMLEN &&
1993                     ((nd->nd_flag & ND_NFSV3) || nlen > 2 ||
1994                      (nlen==2 && (dp->d_name[0]!='.' || dp->d_name[1]!='.'))
1995                       || (nlen == 1 && dp->d_name[0] != '.'))) {
1996                         /*
1997                          * Save the current position in the reply, in case
1998                          * this entry exceeds cnt.
1999                          */
2000                         mb1 = nd->nd_mb;
2001                         bpos1 = nd->nd_bpos;
2002
2003                         /*
2004                          * For readdir_and_lookup get the vnode using
2005                          * the file number.
2006                          */
2007                         nvp = NULL;
2008                         refp = NULL;
2009                         r = 0;
2010                         at_root = 0;
2011                         needs_unbusy = 0;
2012                         new_mp = mp;
2013                         mounted_on_fileno = (uint64_t)dp->d_fileno;
2014                         if ((nd->nd_flag & ND_NFSV3) ||
2015                             NFSNONZERO_ATTRBIT(&savbits)) {
2016                                 if (nd->nd_flag & ND_NFSV4)
2017                                         refp = nfsv4root_getreferral(NULL,
2018                                             vp, dp->d_fileno);
2019                                 if (refp == NULL) {
2020                                         if (usevget)
2021                                                 r = VFS_VGET(mp, dp->d_fileno,
2022                                                     LK_SHARED, &nvp);
2023                                         else
2024                                                 r = EOPNOTSUPP;
2025                                         if (r == EOPNOTSUPP) {
2026                                                 if (usevget) {
2027                                                         usevget = 0;
2028                                                         cn.cn_nameiop = LOOKUP;
2029                                                         cn.cn_lkflags =
2030                                                             LK_SHARED |
2031                                                             LK_RETRY;
2032                                                         cn.cn_cred =
2033                                                             nd->nd_cred;
2034                                                         cn.cn_thread = p;
2035                                                 }
2036                                                 cn.cn_nameptr = dp->d_name;
2037                                                 cn.cn_namelen = nlen;
2038                                                 cn.cn_flags = ISLASTCN |
2039                                                     NOFOLLOW | LOCKLEAF |
2040                                                     MPSAFE;
2041                                                 if (nlen == 2 &&
2042                                                     dp->d_name[0] == '.' &&
2043                                                     dp->d_name[1] == '.')
2044                                                         cn.cn_flags |=
2045                                                             ISDOTDOT;
2046                                                 if (NFSVOPLOCK(vp, LK_SHARED)
2047                                                     != 0) {
2048                                                         nd->nd_repstat = EPERM;
2049                                                         break;
2050                                                 }
2051                                                 if ((vp->v_vflag & VV_ROOT) != 0
2052                                                     && (cn.cn_flags & ISDOTDOT)
2053                                                     != 0) {
2054                                                         vref(vp);
2055                                                         nvp = vp;
2056                                                         r = 0;
2057                                                 } else {
2058                                                         r = VOP_LOOKUP(vp, &nvp,
2059                                                             &cn);
2060                                                         if (vp != nvp)
2061                                                                 NFSVOPUNLOCK(vp,
2062                                                                     0);
2063                                                 }
2064                                         }
2065
2066                                         /*
2067                                          * For NFSv4, check to see if nvp is
2068                                          * a mount point and get the mount
2069                                          * point vnode, as required.
2070                                          */
2071                                         if (r == 0 &&
2072                                             nfsrv_enable_crossmntpt != 0 &&
2073                                             (nd->nd_flag & ND_NFSV4) != 0 &&
2074                                             nvp->v_type == VDIR &&
2075                                             nvp->v_mountedhere != NULL) {
2076                                                 new_mp = nvp->v_mountedhere;
2077                                                 r = vfs_busy(new_mp, 0);
2078                                                 vput(nvp);
2079                                                 nvp = NULL;
2080                                                 if (r == 0) {
2081                                                         r = VFS_ROOT(new_mp,
2082                                                             LK_SHARED, &nvp);
2083                                                         needs_unbusy = 1;
2084                                                         if (r == 0)
2085                                                                 at_root = 1;
2086                                                 }
2087                                         }
2088                                 }
2089                                 if (!r) {
2090                                     if (refp == NULL &&
2091                                         ((nd->nd_flag & ND_NFSV3) ||
2092                                          NFSNONZERO_ATTRBIT(&attrbits))) {
2093                                         r = nfsvno_getfh(nvp, &nfh, p);
2094                                         if (!r)
2095                                             r = nfsvno_getattr(nvp, nvap,
2096                                                 nd->nd_cred, p, 1);
2097                                     }
2098                                 } else {
2099                                     nvp = NULL;
2100                                 }
2101                                 if (r) {
2102                                         if (!NFSISSET_ATTRBIT(&attrbits,
2103                                             NFSATTRBIT_RDATTRERROR)) {
2104                                                 if (nvp != NULL)
2105                                                         vput(nvp);
2106                                                 if (needs_unbusy != 0)
2107                                                         vfs_unbusy(new_mp);
2108                                                 nd->nd_repstat = r;
2109                                                 break;
2110                                         }
2111                                 }
2112                         }
2113
2114                         /*
2115                          * Build the directory record xdr
2116                          */
2117                         if (nd->nd_flag & ND_NFSV3) {
2118                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
2119                                 *tl++ = newnfs_true;
2120                                 *tl++ = 0;
2121                                 *tl = txdr_unsigned(dp->d_fileno);
2122                                 dirlen += nfsm_strtom(nd, dp->d_name, nlen);
2123                                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2124                                 *tl++ = 0;
2125                                 *tl = txdr_unsigned(*cookiep);
2126                                 nfsrv_postopattr(nd, 0, nvap);
2127                                 dirlen += nfsm_fhtom(nd,(u_int8_t *)&nfh,0,1);
2128                                 dirlen += (5*NFSX_UNSIGNED+NFSX_V3POSTOPATTR);
2129                                 if (nvp != NULL)
2130                                         vput(nvp);
2131                         } else {
2132                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
2133                                 *tl++ = newnfs_true;
2134                                 *tl++ = 0;
2135                                 *tl = txdr_unsigned(*cookiep);
2136                                 dirlen += nfsm_strtom(nd, dp->d_name, nlen);
2137                                 if (nvp != NULL) {
2138                                         supports_nfsv4acls =
2139                                             nfs_supportsnfsv4acls(nvp);
2140                                         NFSVOPUNLOCK(nvp, 0);
2141                                 } else
2142                                         supports_nfsv4acls = 0;
2143                                 if (refp != NULL) {
2144                                         dirlen += nfsrv_putreferralattr(nd,
2145                                             &savbits, refp, 0,
2146                                             &nd->nd_repstat);
2147                                         if (nd->nd_repstat) {
2148                                                 if (nvp != NULL)
2149                                                         vrele(nvp);
2150                                                 if (needs_unbusy != 0)
2151                                                         vfs_unbusy(new_mp);
2152                                                 break;
2153                                         }
2154                                 } else if (r) {
2155                                         dirlen += nfsvno_fillattr(nd, new_mp,
2156                                             nvp, nvap, &nfh, r, &rderrbits,
2157                                             nd->nd_cred, p, isdgram, 0,
2158                                             supports_nfsv4acls, at_root,
2159                                             mounted_on_fileno);
2160                                 } else {
2161                                         dirlen += nfsvno_fillattr(nd, new_mp,
2162                                             nvp, nvap, &nfh, r, &attrbits,
2163                                             nd->nd_cred, p, isdgram, 0,
2164                                             supports_nfsv4acls, at_root,
2165                                             mounted_on_fileno);
2166                                 }
2167                                 if (nvp != NULL)
2168                                         vrele(nvp);
2169                                 dirlen += (3 * NFSX_UNSIGNED);
2170                         }
2171                         if (needs_unbusy != 0)
2172                                 vfs_unbusy(new_mp);
2173                         if (dirlen <= cnt)
2174                                 entrycnt++;
2175                 }
2176                 cpos += dp->d_reclen;
2177                 dp = (struct dirent *)cpos;
2178                 cookiep++;
2179                 ncookies--;
2180         }
2181         vrele(vp);
2182         vfs_unbusy(mp);
2183
2184         /*
2185          * If dirlen > cnt, we must strip off the last entry. If that
2186          * results in an empty reply, report NFSERR_TOOSMALL.
2187          */
2188         if (dirlen > cnt || nd->nd_repstat) {
2189                 if (!nd->nd_repstat && entrycnt == 0)
2190                         nd->nd_repstat = NFSERR_TOOSMALL;
2191                 if (nd->nd_repstat)
2192                         newnfs_trimtrailing(nd, mb0, bpos0);
2193                 else
2194                         newnfs_trimtrailing(nd, mb1, bpos1);
2195                 eofflag = 0;
2196         } else if (cpos < cend)
2197                 eofflag = 0;
2198         if (!nd->nd_repstat) {
2199                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2200                 *tl++ = newnfs_false;
2201                 if (eofflag)
2202                         *tl = newnfs_true;
2203                 else
2204                         *tl = newnfs_false;
2205         }
2206         FREE((caddr_t)cookies, M_TEMP);
2207         FREE((caddr_t)rbuf, M_TEMP);
2208
2209 out:
2210         NFSEXITCODE2(0, nd);
2211         return (0);
2212 nfsmout:
2213         vput(vp);
2214         NFSEXITCODE2(error, nd);
2215         return (error);
2216 }
2217
2218 /*
2219  * Get the settable attributes out of the mbuf list.
2220  * (Return 0 or EBADRPC)
2221  */
2222 int
2223 nfsrv_sattr(struct nfsrv_descript *nd, struct nfsvattr *nvap,
2224     nfsattrbit_t *attrbitp, NFSACL_T *aclp, struct thread *p)
2225 {
2226         u_int32_t *tl;
2227         struct nfsv2_sattr *sp;
2228         struct timeval curtime;
2229         int error = 0, toclient = 0;
2230
2231         switch (nd->nd_flag & (ND_NFSV2 | ND_NFSV3 | ND_NFSV4)) {
2232         case ND_NFSV2:
2233                 NFSM_DISSECT(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
2234                 /*
2235                  * Some old clients didn't fill in the high order 16bits.
2236                  * --> check the low order 2 bytes for 0xffff
2237                  */
2238                 if ((fxdr_unsigned(int, sp->sa_mode) & 0xffff) != 0xffff)
2239                         nvap->na_mode = nfstov_mode(sp->sa_mode);
2240                 if (sp->sa_uid != newnfs_xdrneg1)
2241                         nvap->na_uid = fxdr_unsigned(uid_t, sp->sa_uid);
2242                 if (sp->sa_gid != newnfs_xdrneg1)
2243                         nvap->na_gid = fxdr_unsigned(gid_t, sp->sa_gid);
2244                 if (sp->sa_size != newnfs_xdrneg1)
2245                         nvap->na_size = fxdr_unsigned(u_quad_t, sp->sa_size);
2246                 if (sp->sa_atime.nfsv2_sec != newnfs_xdrneg1) {
2247 #ifdef notyet
2248                         fxdr_nfsv2time(&sp->sa_atime, &nvap->na_atime);
2249 #else
2250                         nvap->na_atime.tv_sec =
2251                                 fxdr_unsigned(u_int32_t,sp->sa_atime.nfsv2_sec);
2252                         nvap->na_atime.tv_nsec = 0;
2253 #endif
2254                 }
2255                 if (sp->sa_mtime.nfsv2_sec != newnfs_xdrneg1)
2256                         fxdr_nfsv2time(&sp->sa_mtime, &nvap->na_mtime);
2257                 break;
2258         case ND_NFSV3:
2259                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2260                 if (*tl == newnfs_true) {
2261                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2262                         nvap->na_mode = nfstov_mode(*tl);
2263                 }
2264                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2265                 if (*tl == newnfs_true) {
2266                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2267                         nvap->na_uid = fxdr_unsigned(uid_t, *tl);
2268                 }
2269                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2270                 if (*tl == newnfs_true) {
2271                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2272                         nvap->na_gid = fxdr_unsigned(gid_t, *tl);
2273                 }
2274                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2275                 if (*tl == newnfs_true) {
2276                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2277                         nvap->na_size = fxdr_hyper(tl);
2278                 }
2279                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2280                 switch (fxdr_unsigned(int, *tl)) {
2281                 case NFSV3SATTRTIME_TOCLIENT:
2282                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2283                         fxdr_nfsv3time(tl, &nvap->na_atime);
2284                         toclient = 1;
2285                         break;
2286                 case NFSV3SATTRTIME_TOSERVER:
2287                         NFSGETTIME(&curtime);
2288                         nvap->na_atime.tv_sec = curtime.tv_sec;
2289                         nvap->na_atime.tv_nsec = curtime.tv_usec * 1000;
2290                         nvap->na_vaflags |= VA_UTIMES_NULL;
2291                         break;
2292                 };
2293                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2294                 switch (fxdr_unsigned(int, *tl)) {
2295                 case NFSV3SATTRTIME_TOCLIENT:
2296                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2297                         fxdr_nfsv3time(tl, &nvap->na_mtime);
2298                         nvap->na_vaflags &= ~VA_UTIMES_NULL;
2299                         break;
2300                 case NFSV3SATTRTIME_TOSERVER:
2301                         NFSGETTIME(&curtime);
2302                         nvap->na_mtime.tv_sec = curtime.tv_sec;
2303                         nvap->na_mtime.tv_nsec = curtime.tv_usec * 1000;
2304                         if (!toclient)
2305                                 nvap->na_vaflags |= VA_UTIMES_NULL;
2306                         break;
2307                 };
2308                 break;
2309         case ND_NFSV4:
2310                 error = nfsv4_sattr(nd, nvap, attrbitp, aclp, p);
2311         };
2312 nfsmout:
2313         NFSEXITCODE2(error, nd);
2314         return (error);
2315 }
2316
2317 /*
2318  * Handle the setable attributes for V4.
2319  * Returns NFSERR_BADXDR if it can't be parsed, 0 otherwise.
2320  */
2321 int
2322 nfsv4_sattr(struct nfsrv_descript *nd, struct nfsvattr *nvap,
2323     nfsattrbit_t *attrbitp, NFSACL_T *aclp, struct thread *p)
2324 {
2325         u_int32_t *tl;
2326         int attrsum = 0;
2327         int i, j;
2328         int error, attrsize, bitpos, aclsize, aceerr, retnotsup = 0;
2329         int toclient = 0;
2330         u_char *cp, namestr[NFSV4_SMALLSTR + 1];
2331         uid_t uid;
2332         gid_t gid;
2333         struct timeval curtime;
2334
2335         error = nfsrv_getattrbits(nd, attrbitp, NULL, &retnotsup);
2336         if (error)
2337                 goto nfsmout;
2338         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2339         attrsize = fxdr_unsigned(int, *tl);
2340
2341         /*
2342          * Loop around getting the setable attributes. If an unsupported
2343          * one is found, set nd_repstat == NFSERR_ATTRNOTSUPP and return.
2344          */
2345         if (retnotsup) {
2346                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2347                 bitpos = NFSATTRBIT_MAX;
2348         } else {
2349                 bitpos = 0;
2350         }
2351         for (; bitpos < NFSATTRBIT_MAX; bitpos++) {
2352             if (attrsum > attrsize) {
2353                 error = NFSERR_BADXDR;
2354                 goto nfsmout;
2355             }
2356             if (NFSISSET_ATTRBIT(attrbitp, bitpos))
2357                 switch (bitpos) {
2358                 case NFSATTRBIT_SIZE:
2359                         NFSM_DISSECT(tl, u_int32_t *, NFSX_HYPER);
2360                         nvap->na_size = fxdr_hyper(tl);
2361                         attrsum += NFSX_HYPER;
2362                         break;
2363                 case NFSATTRBIT_ACL:
2364                         error = nfsrv_dissectacl(nd, aclp, &aceerr, &aclsize,
2365                             p);
2366                         if (error)
2367                                 goto nfsmout;
2368                         if (aceerr && !nd->nd_repstat)
2369                                 nd->nd_repstat = aceerr;
2370                         attrsum += aclsize;
2371                         break;
2372                 case NFSATTRBIT_ARCHIVE:
2373                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2374                         if (!nd->nd_repstat)
2375                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2376                         attrsum += NFSX_UNSIGNED;
2377                         break;
2378                 case NFSATTRBIT_HIDDEN:
2379                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2380                         if (!nd->nd_repstat)
2381                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2382                         attrsum += NFSX_UNSIGNED;
2383                         break;
2384                 case NFSATTRBIT_MIMETYPE:
2385                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2386                         i = fxdr_unsigned(int, *tl);
2387                         error = nfsm_advance(nd, NFSM_RNDUP(i), -1);
2388                         if (error)
2389                                 goto nfsmout;
2390                         if (!nd->nd_repstat)
2391                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2392                         attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(i));
2393                         break;
2394                 case NFSATTRBIT_MODE:
2395                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2396                         nvap->na_mode = nfstov_mode(*tl);
2397                         attrsum += NFSX_UNSIGNED;
2398                         break;
2399                 case NFSATTRBIT_OWNER:
2400                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2401                         j = fxdr_unsigned(int, *tl);
2402                         if (j < 0) {
2403                                 error = NFSERR_BADXDR;
2404                                 goto nfsmout;
2405                         }
2406                         if (j > NFSV4_SMALLSTR)
2407                                 cp = malloc(j + 1, M_NFSSTRING, M_WAITOK);
2408                         else
2409                                 cp = namestr;
2410                         error = nfsrv_mtostr(nd, cp, j);
2411                         if (error) {
2412                                 if (j > NFSV4_SMALLSTR)
2413                                         free(cp, M_NFSSTRING);
2414                                 goto nfsmout;
2415                         }
2416                         if (!nd->nd_repstat) {
2417                                 nd->nd_repstat = nfsv4_strtouid(cp,j,&uid,p);
2418                                 if (!nd->nd_repstat)
2419                                         nvap->na_uid = uid;
2420                         }
2421                         if (j > NFSV4_SMALLSTR)
2422                                 free(cp, M_NFSSTRING);
2423                         attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(j));
2424                         break;
2425                 case NFSATTRBIT_OWNERGROUP:
2426                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2427                         j = fxdr_unsigned(int, *tl);
2428                         if (j < 0) {
2429                                 error = NFSERR_BADXDR;
2430                                 goto nfsmout;
2431                         }
2432                         if (j > NFSV4_SMALLSTR)
2433                                 cp = malloc(j + 1, M_NFSSTRING, M_WAITOK);
2434                         else
2435                                 cp = namestr;
2436                         error = nfsrv_mtostr(nd, cp, j);
2437                         if (error) {
2438                                 if (j > NFSV4_SMALLSTR)
2439                                         free(cp, M_NFSSTRING);
2440                                 goto nfsmout;
2441                         }
2442                         if (!nd->nd_repstat) {
2443                                 nd->nd_repstat = nfsv4_strtogid(cp,j,&gid,p);
2444                                 if (!nd->nd_repstat)
2445                                         nvap->na_gid = gid;
2446                         }
2447                         if (j > NFSV4_SMALLSTR)
2448                                 free(cp, M_NFSSTRING);
2449                         attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(j));
2450                         break;
2451                 case NFSATTRBIT_SYSTEM:
2452                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2453                         if (!nd->nd_repstat)
2454                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2455                         attrsum += NFSX_UNSIGNED;
2456                         break;
2457                 case NFSATTRBIT_TIMEACCESSSET:
2458                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2459                         attrsum += NFSX_UNSIGNED;
2460                         if (fxdr_unsigned(int, *tl)==NFSV4SATTRTIME_TOCLIENT) {
2461                             NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2462                             fxdr_nfsv4time(tl, &nvap->na_atime);
2463                             toclient = 1;
2464                             attrsum += NFSX_V4TIME;
2465                         } else {
2466                             NFSGETTIME(&curtime);
2467                             nvap->na_atime.tv_sec = curtime.tv_sec;
2468                             nvap->na_atime.tv_nsec = curtime.tv_usec * 1000;
2469                             nvap->na_vaflags |= VA_UTIMES_NULL;
2470                         }
2471                         break;
2472                 case NFSATTRBIT_TIMEBACKUP:
2473                         NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2474                         if (!nd->nd_repstat)
2475                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2476                         attrsum += NFSX_V4TIME;
2477                         break;
2478                 case NFSATTRBIT_TIMECREATE:
2479                         NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2480                         if (!nd->nd_repstat)
2481                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2482                         attrsum += NFSX_V4TIME;
2483                         break;
2484                 case NFSATTRBIT_TIMEMODIFYSET:
2485                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2486                         attrsum += NFSX_UNSIGNED;
2487                         if (fxdr_unsigned(int, *tl)==NFSV4SATTRTIME_TOCLIENT) {
2488                             NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2489                             fxdr_nfsv4time(tl, &nvap->na_mtime);
2490                             nvap->na_vaflags &= ~VA_UTIMES_NULL;
2491                             attrsum += NFSX_V4TIME;
2492                         } else {
2493                             NFSGETTIME(&curtime);
2494                             nvap->na_mtime.tv_sec = curtime.tv_sec;
2495                             nvap->na_mtime.tv_nsec = curtime.tv_usec * 1000;
2496                             if (!toclient)
2497                                 nvap->na_vaflags |= VA_UTIMES_NULL;
2498                         }
2499                         break;
2500                 default:
2501                         nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2502                         /*
2503                          * set bitpos so we drop out of the loop.
2504                          */
2505                         bitpos = NFSATTRBIT_MAX;
2506                         break;
2507                 };
2508         }
2509
2510         /*
2511          * some clients pad the attrlist, so we need to skip over the
2512          * padding.
2513          */
2514         if (attrsum > attrsize) {
2515                 error = NFSERR_BADXDR;
2516         } else {
2517                 attrsize = NFSM_RNDUP(attrsize);
2518                 if (attrsum < attrsize)
2519                         error = nfsm_advance(nd, attrsize - attrsum, -1);
2520         }
2521 nfsmout:
2522         NFSEXITCODE2(error, nd);
2523         return (error);
2524 }
2525
2526 /*
2527  * Check/setup export credentials.
2528  */
2529 int
2530 nfsd_excred(struct nfsrv_descript *nd, struct nfsexstuff *exp,
2531     struct ucred *credanon)
2532 {
2533         int error = 0;
2534
2535         /*
2536          * Check/setup credentials.
2537          */
2538         if (nd->nd_flag & ND_GSS)
2539                 exp->nes_exflag &= ~MNT_EXPORTANON;
2540
2541         /*
2542          * Check to see if the operation is allowed for this security flavor.
2543          * RFC2623 suggests that the NFSv3 Fsinfo RPC be allowed to
2544          * AUTH_NONE or AUTH_SYS for file systems requiring RPCSEC_GSS.
2545          * Also, allow Secinfo, so that it can acquire the correct flavor(s).
2546          */
2547         if (nfsvno_testexp(nd, exp) &&
2548             nd->nd_procnum != NFSV4OP_SECINFO &&
2549             nd->nd_procnum != NFSPROC_FSINFO) {
2550                 if (nd->nd_flag & ND_NFSV4)
2551                         error = NFSERR_WRONGSEC;
2552                 else
2553                         error = (NFSERR_AUTHERR | AUTH_TOOWEAK);
2554                 goto out;
2555         }
2556
2557         /*
2558          * Check to see if the file system is exported V4 only.
2559          */
2560         if (NFSVNO_EXV4ONLY(exp) && !(nd->nd_flag & ND_NFSV4)) {
2561                 error = NFSERR_PROGNOTV4;
2562                 goto out;
2563         }
2564
2565         /*
2566          * Now, map the user credentials.
2567          * (Note that ND_AUTHNONE will only be set for an NFSv3
2568          *  Fsinfo RPC. If set for anything else, this code might need
2569          *  to change.)
2570          */
2571         if (NFSVNO_EXPORTED(exp) &&
2572             ((!(nd->nd_flag & ND_GSS) && nd->nd_cred->cr_uid == 0) ||
2573              NFSVNO_EXPORTANON(exp) ||
2574              (nd->nd_flag & ND_AUTHNONE))) {
2575                 nd->nd_cred->cr_uid = credanon->cr_uid;
2576                 nd->nd_cred->cr_gid = credanon->cr_gid;
2577                 crsetgroups(nd->nd_cred, credanon->cr_ngroups,
2578                     credanon->cr_groups);
2579         }
2580
2581 out:
2582         NFSEXITCODE2(error, nd);
2583         return (error);
2584 }
2585
2586 /*
2587  * Check exports.
2588  */
2589 int
2590 nfsvno_checkexp(struct mount *mp, struct sockaddr *nam, struct nfsexstuff *exp,
2591     struct ucred **credp)
2592 {
2593         int i, error, *secflavors;
2594
2595         error = VFS_CHECKEXP(mp, nam, &exp->nes_exflag, credp,
2596             &exp->nes_numsecflavor, &secflavors);
2597         if (error) {
2598                 if (nfs_rootfhset) {
2599                         exp->nes_exflag = 0;
2600                         exp->nes_numsecflavor = 0;
2601                         error = 0;
2602                 }
2603         } else {
2604                 /* Copy the security flavors. */
2605                 for (i = 0; i < exp->nes_numsecflavor; i++)
2606                         exp->nes_secflavors[i] = secflavors[i];
2607         }
2608         NFSEXITCODE(error);
2609         return (error);
2610 }
2611
2612 /*
2613  * Get a vnode for a file handle and export stuff.
2614  */
2615 int
2616 nfsvno_fhtovp(struct mount *mp, fhandle_t *fhp, struct sockaddr *nam,
2617     int lktype, struct vnode **vpp, struct nfsexstuff *exp,
2618     struct ucred **credp)
2619 {
2620         int i, error, *secflavors;
2621
2622         *credp = NULL;
2623         exp->nes_numsecflavor = 0;
2624         if (VFS_NEEDSGIANT(mp))
2625                 error = ESTALE;
2626         else
2627                 error = VFS_FHTOVP(mp, &fhp->fh_fid, LK_EXCLUSIVE, vpp);
2628         if (error != 0)
2629                 /* Make sure the server replies ESTALE to the client. */
2630                 error = ESTALE;
2631         if (nam && !error) {
2632                 error = VFS_CHECKEXP(mp, nam, &exp->nes_exflag, credp,
2633                     &exp->nes_numsecflavor, &secflavors);
2634                 if (error) {
2635                         if (nfs_rootfhset) {
2636                                 exp->nes_exflag = 0;
2637                                 exp->nes_numsecflavor = 0;
2638                                 error = 0;
2639                         } else {
2640                                 vput(*vpp);
2641                         }
2642                 } else {
2643                         /* Copy the security flavors. */
2644                         for (i = 0; i < exp->nes_numsecflavor; i++)
2645                                 exp->nes_secflavors[i] = secflavors[i];
2646                 }
2647         }
2648         if (error == 0 && lktype == LK_SHARED)
2649                 /*
2650                  * It would be much better to pass lktype to VFS_FHTOVP(),
2651                  * but this will have to do until VFS_FHTOVP() has a lock
2652                  * type argument like VFS_VGET().
2653                  */
2654                 NFSVOPLOCK(*vpp, LK_DOWNGRADE | LK_RETRY);
2655
2656         NFSEXITCODE(error);
2657         return (error);
2658 }
2659
2660 /*
2661  * nfsd_fhtovp() - convert a fh to a vnode ptr
2662  *      - look up fsid in mount list (if not found ret error)
2663  *      - get vp and export rights by calling nfsvno_fhtovp()
2664  *      - if cred->cr_uid == 0 or MNT_EXPORTANON set it to credanon
2665  *        for AUTH_SYS
2666  *      - if mpp != NULL, return the mount point so that it can
2667  *        be used for vn_finished_write() by the caller
2668  */
2669 void
2670 nfsd_fhtovp(struct nfsrv_descript *nd, struct nfsrvfh *nfp, int lktype,
2671     struct vnode **vpp, struct nfsexstuff *exp,
2672     struct mount **mpp, int startwrite, struct thread *p)
2673 {
2674         struct mount *mp;
2675         struct ucred *credanon;
2676         fhandle_t *fhp;
2677
2678         fhp = (fhandle_t *)nfp->nfsrvfh_data;
2679         /*
2680          * Check for the special case of the nfsv4root_fh.
2681          */
2682         mp = vfs_busyfs(&fhp->fh_fsid);
2683         if (mpp != NULL)
2684                 *mpp = mp;
2685         if (mp == NULL) {
2686                 *vpp = NULL;
2687                 nd->nd_repstat = ESTALE;
2688                 goto out;
2689         }
2690
2691         if (startwrite)
2692                 vn_start_write(NULL, mpp, V_WAIT);
2693
2694         nd->nd_repstat = nfsvno_fhtovp(mp, fhp, nd->nd_nam, lktype, vpp, exp,
2695             &credanon);
2696         vfs_unbusy(mp);
2697
2698         /*
2699          * For NFSv4 without a pseudo root fs, unexported file handles
2700          * can be returned, so that Lookup works everywhere.
2701          */
2702         if (!nd->nd_repstat && exp->nes_exflag == 0 &&
2703             !(nd->nd_flag & ND_NFSV4)) {
2704                 vput(*vpp);
2705                 nd->nd_repstat = EACCES;
2706         }
2707
2708         /*
2709          * Personally, I've never seen any point in requiring a
2710          * reserved port#, since only in the rare case where the
2711          * clients are all boxes with secure system priviledges,
2712          * does it provide any enhanced security, but... some people
2713          * believe it to be useful and keep putting this code back in.
2714          * (There is also some "security checker" out there that
2715          *  complains if the nfs server doesn't enforce this.)
2716          * However, note the following:
2717          * RFC3530 (NFSv4) specifies that a reserved port# not be
2718          *      required.
2719          * RFC2623 recommends that, if a reserved port# is checked for,
2720          *      that there be a way to turn that off--> ifdef'd.
2721          */
2722 #ifdef NFS_REQRSVPORT
2723         if (!nd->nd_repstat) {
2724                 struct sockaddr_in *saddr;
2725                 struct sockaddr_in6 *saddr6;
2726
2727                 saddr = NFSSOCKADDR(nd->nd_nam, struct sockaddr_in *);
2728                 saddr6 = NFSSOCKADDR(nd->nd_nam, struct sockaddr_in6 *);
2729                 if (!(nd->nd_flag & ND_NFSV4) &&
2730                     ((saddr->sin_family == AF_INET &&
2731                       ntohs(saddr->sin_port) >= IPPORT_RESERVED) ||
2732                      (saddr6->sin6_family == AF_INET6 &&
2733                       ntohs(saddr6->sin6_port) >= IPPORT_RESERVED))) {
2734                         vput(*vpp);
2735                         nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
2736                 }
2737         }
2738 #endif  /* NFS_REQRSVPORT */
2739
2740         /*
2741          * Check/setup credentials.
2742          */
2743         if (!nd->nd_repstat) {
2744                 nd->nd_saveduid = nd->nd_cred->cr_uid;
2745                 nd->nd_repstat = nfsd_excred(nd, exp, credanon);
2746                 if (nd->nd_repstat)
2747                         vput(*vpp);
2748         }
2749         if (credanon != NULL)
2750                 crfree(credanon);
2751         if (nd->nd_repstat) {
2752                 if (startwrite)
2753                         vn_finished_write(mp);
2754                 *vpp = NULL;
2755                 if (mpp != NULL)
2756                         *mpp = NULL;
2757         }
2758
2759 out:
2760         NFSEXITCODE2(0, nd);
2761 }
2762
2763 /*
2764  * glue for fp.
2765  */
2766 int
2767 fp_getfvp(struct thread *p, int fd, struct file **fpp, struct vnode **vpp)
2768 {
2769         struct filedesc *fdp;
2770         struct file *fp;
2771         int error = 0;
2772
2773         fdp = p->td_proc->p_fd;
2774         if (fd >= fdp->fd_nfiles ||
2775             (fp = fdp->fd_ofiles[fd]) == NULL) {
2776                 error = EBADF;
2777                 goto out;
2778         }
2779         *fpp = fp;
2780
2781 out:
2782         NFSEXITCODE(error);
2783         return (error);
2784 }
2785
2786 /*
2787  * Called from nfssvc() to update the exports list. Just call
2788  * vfs_export(). This has to be done, since the v4 root fake fs isn't
2789  * in the mount list.
2790  */
2791 int
2792 nfsrv_v4rootexport(void *argp, struct ucred *cred, struct thread *p)
2793 {
2794         struct nfsex_args *nfsexargp = (struct nfsex_args *)argp;
2795         int error = 0;
2796         struct nameidata nd;
2797         fhandle_t fh;
2798
2799         error = vfs_export(&nfsv4root_mnt, &nfsexargp->export);
2800         if ((nfsexargp->export.ex_flags & MNT_DELEXPORT) != 0)
2801                 nfs_rootfhset = 0;
2802         else if (error == 0) {
2803                 if (nfsexargp->fspec == NULL) {
2804                         error = EPERM;
2805                         goto out;
2806                 }
2807                 /*
2808                  * If fspec != NULL, this is the v4root path.
2809                  */
2810                 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE, UIO_USERSPACE,
2811                     nfsexargp->fspec, p);
2812                 if ((error = namei(&nd)) != 0)
2813                         goto out;
2814                 error = nfsvno_getfh(nd.ni_vp, &fh, p);
2815                 vrele(nd.ni_vp);
2816                 if (!error) {
2817                         nfs_rootfh.nfsrvfh_len = NFSX_MYFH;
2818                         NFSBCOPY((caddr_t)&fh,
2819                             nfs_rootfh.nfsrvfh_data,
2820                             sizeof (fhandle_t));
2821                         nfs_rootfhset = 1;
2822                 }
2823         }
2824
2825 out:
2826         NFSEXITCODE(error);
2827         return (error);
2828 }
2829
2830 /*
2831  * Get the tcp socket sequence numbers we need.
2832  * (Maybe this should be moved to the tcp sources?)
2833  */
2834 int
2835 nfsrv_getsocksndseq(struct socket *so, tcp_seq *maxp, tcp_seq *unap)
2836 {
2837         struct inpcb *inp;
2838         struct tcpcb *tp;
2839         int error = 0;
2840
2841         inp = sotoinpcb(so);
2842         KASSERT(inp != NULL, ("nfsrv_getsocksndseq: inp == NULL"));
2843         INP_RLOCK(inp);
2844         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
2845                 INP_RUNLOCK(inp);
2846                 error = EPIPE;
2847                 goto out;
2848         }
2849         tp = intotcpcb(inp);
2850         if (tp->t_state != TCPS_ESTABLISHED) {
2851                 INP_RUNLOCK(inp);
2852                 error = EPIPE;
2853                 goto out;
2854         }
2855         *maxp = tp->snd_max;
2856         *unap = tp->snd_una;
2857         INP_RUNLOCK(inp);
2858
2859 out:
2860         NFSEXITCODE(error);
2861         return (error);
2862 }
2863
2864 /*
2865  * This function needs to test to see if the system is near its limit
2866  * for memory allocation via malloc() or mget() and return True iff
2867  * either of these resources are near their limit.
2868  * XXX (For now, this is just a stub.)
2869  */
2870 int nfsrv_testmalloclimit = 0;
2871 int
2872 nfsrv_mallocmget_limit(void)
2873 {
2874         static int printmesg = 0;
2875         static int testval = 1;
2876
2877         if (nfsrv_testmalloclimit && (testval++ % 1000) == 0) {
2878                 if ((printmesg++ % 100) == 0)
2879                         printf("nfsd: malloc/mget near limit\n");
2880                 return (1);
2881         }
2882         return (0);
2883 }
2884
2885 /*
2886  * BSD specific initialization of a mount point.
2887  */
2888 void
2889 nfsd_mntinit(void)
2890 {
2891         static int inited = 0;
2892
2893         if (inited)
2894                 return;
2895         inited = 1;
2896         nfsv4root_mnt.mnt_flag = (MNT_RDONLY | MNT_EXPORTED);
2897         TAILQ_INIT(&nfsv4root_mnt.mnt_nvnodelist);
2898         nfsv4root_mnt.mnt_export = NULL;
2899         TAILQ_INIT(&nfsv4root_opt);
2900         TAILQ_INIT(&nfsv4root_newopt);
2901         nfsv4root_mnt.mnt_opt = &nfsv4root_opt;
2902         nfsv4root_mnt.mnt_optnew = &nfsv4root_newopt;
2903         nfsv4root_mnt.mnt_nvnodelistsize = 0;
2904 }
2905
2906 /*
2907  * Get a vnode for a file handle, without checking exports, etc.
2908  */
2909 struct vnode *
2910 nfsvno_getvp(fhandle_t *fhp)
2911 {
2912         struct mount *mp;
2913         struct vnode *vp;
2914         int error;
2915
2916         mp = vfs_busyfs(&fhp->fh_fsid);
2917         if (mp == NULL)
2918                 return (NULL);
2919         error = VFS_FHTOVP(mp, &fhp->fh_fid, LK_EXCLUSIVE, &vp);
2920         vfs_unbusy(mp);
2921         if (error)
2922                 return (NULL);
2923         return (vp);
2924 }
2925
2926 /*
2927  * Do a local VOP_ADVLOCK().
2928  */
2929 int
2930 nfsvno_advlock(struct vnode *vp, int ftype, u_int64_t first,
2931     u_int64_t end, struct thread *td)
2932 {
2933         int error = 0;
2934         struct flock fl;
2935         u_int64_t tlen;
2936
2937         if (nfsrv_dolocallocks == 0)
2938                 goto out;
2939
2940         /* Check for VI_DOOMED here, so that VOP_ADVLOCK() isn't performed. */
2941         if ((vp->v_iflag & VI_DOOMED) != 0) {
2942                 error = EPERM;
2943                 goto out;
2944         }
2945
2946         fl.l_whence = SEEK_SET;
2947         fl.l_type = ftype;
2948         fl.l_start = (off_t)first;
2949         if (end == NFS64BITSSET) {
2950                 fl.l_len = 0;
2951         } else {
2952                 tlen = end - first;
2953                 fl.l_len = (off_t)tlen;
2954         }
2955         /*
2956          * For FreeBSD8, the l_pid and l_sysid must be set to the same
2957          * values for all calls, so that all locks will be held by the
2958          * nfsd server. (The nfsd server handles conflicts between the
2959          * various clients.)
2960          * Since an NFSv4 lockowner is a ClientID plus an array of up to 1024
2961          * bytes, so it can't be put in l_sysid.
2962          */
2963         if (nfsv4_sysid == 0)
2964                 nfsv4_sysid = nlm_acquire_next_sysid();
2965         fl.l_pid = (pid_t)0;
2966         fl.l_sysid = (int)nfsv4_sysid;
2967
2968         NFSVOPUNLOCK(vp, 0);
2969         if (ftype == F_UNLCK)
2970                 error = VOP_ADVLOCK(vp, (caddr_t)td->td_proc, F_UNLCK, &fl,
2971                     (F_POSIX | F_REMOTE));
2972         else
2973                 error = VOP_ADVLOCK(vp, (caddr_t)td->td_proc, F_SETLK, &fl,
2974                     (F_POSIX | F_REMOTE));
2975         NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
2976
2977 out:
2978         NFSEXITCODE(error);
2979         return (error);
2980 }
2981
2982 /*
2983  * Check the nfsv4 root exports.
2984  */
2985 int
2986 nfsvno_v4rootexport(struct nfsrv_descript *nd)
2987 {
2988         struct ucred *credanon;
2989         int exflags, error = 0, numsecflavor, *secflavors, i;
2990
2991         error = vfs_stdcheckexp(&nfsv4root_mnt, nd->nd_nam, &exflags,
2992             &credanon, &numsecflavor, &secflavors);
2993         if (error) {
2994                 error = NFSERR_PROGUNAVAIL;
2995                 goto out;
2996         }
2997         if (credanon != NULL)
2998                 crfree(credanon);
2999         for (i = 0; i < numsecflavor; i++) {
3000                 if (secflavors[i] == AUTH_SYS)
3001                         nd->nd_flag |= ND_EXAUTHSYS;
3002                 else if (secflavors[i] == RPCSEC_GSS_KRB5)
3003                         nd->nd_flag |= ND_EXGSS;
3004                 else if (secflavors[i] == RPCSEC_GSS_KRB5I)
3005                         nd->nd_flag |= ND_EXGSSINTEGRITY;
3006                 else if (secflavors[i] == RPCSEC_GSS_KRB5P)
3007                         nd->nd_flag |= ND_EXGSSPRIVACY;
3008         }
3009
3010 out:
3011         NFSEXITCODE(error);
3012         return (error);
3013 }
3014
3015 /*
3016  * Nfs server psuedo system call for the nfsd's
3017  */
3018 /*
3019  * MPSAFE
3020  */
3021 static int
3022 nfssvc_nfsd(struct thread *td, struct nfssvc_args *uap)
3023 {
3024         struct file *fp;
3025         struct nfsd_addsock_args sockarg;
3026         struct nfsd_nfsd_args nfsdarg;
3027         int error;
3028
3029         if (uap->flag & NFSSVC_NFSDADDSOCK) {
3030                 error = copyin(uap->argp, (caddr_t)&sockarg, sizeof (sockarg));
3031                 if (error)
3032                         goto out;
3033                 /*
3034                  * Since we don't know what rights might be required,
3035                  * pretend that we need them all. It is better to be too
3036                  * careful than too reckless.
3037                  */
3038                 if ((error = fget(td, sockarg.sock, CAP_SOCK_ALL, &fp)) != 0)
3039                         goto out;
3040                 if (fp->f_type != DTYPE_SOCKET) {
3041                         fdrop(fp, td);
3042                         error = EPERM;
3043                         goto out;
3044                 }
3045                 error = nfsrvd_addsock(fp);
3046                 fdrop(fp, td);
3047         } else if (uap->flag & NFSSVC_NFSDNFSD) {
3048                 if (uap->argp == NULL) {
3049                         error = EINVAL;
3050                         goto out;
3051                 }
3052                 error = copyin(uap->argp, (caddr_t)&nfsdarg,
3053                     sizeof (nfsdarg));
3054                 if (error)
3055                         goto out;
3056                 error = nfsrvd_nfsd(td, &nfsdarg);
3057         } else {
3058                 error = nfssvc_srvcall(td, uap, td->td_ucred);
3059         }
3060
3061 out:
3062         NFSEXITCODE(error);
3063         return (error);
3064 }
3065
3066 static int
3067 nfssvc_srvcall(struct thread *p, struct nfssvc_args *uap, struct ucred *cred)
3068 {
3069         struct nfsex_args export;
3070         struct file *fp = NULL;
3071         int stablefd, len;
3072         struct nfsd_clid adminrevoke;
3073         struct nfsd_dumplist dumplist;
3074         struct nfsd_dumpclients *dumpclients;
3075         struct nfsd_dumplocklist dumplocklist;
3076         struct nfsd_dumplocks *dumplocks;
3077         struct nameidata nd;
3078         vnode_t vp;
3079         int error = EINVAL;
3080         struct proc *procp;
3081
3082         if (uap->flag & NFSSVC_PUBLICFH) {
3083                 NFSBZERO((caddr_t)&nfs_pubfh.nfsrvfh_data,
3084                     sizeof (fhandle_t));
3085                 error = copyin(uap->argp,
3086                     &nfs_pubfh.nfsrvfh_data, sizeof (fhandle_t));
3087                 if (!error)
3088                         nfs_pubfhset = 1;
3089         } else if (uap->flag & NFSSVC_V4ROOTEXPORT) {
3090                 error = copyin(uap->argp,(caddr_t)&export,
3091                     sizeof (struct nfsex_args));
3092                 if (!error)
3093                         error = nfsrv_v4rootexport(&export, cred, p);
3094         } else if (uap->flag & NFSSVC_NOPUBLICFH) {
3095                 nfs_pubfhset = 0;
3096                 error = 0;
3097         } else if (uap->flag & NFSSVC_STABLERESTART) {
3098                 error = copyin(uap->argp, (caddr_t)&stablefd,
3099                     sizeof (int));
3100                 if (!error)
3101                         error = fp_getfvp(p, stablefd, &fp, &vp);
3102                 if (!error && (NFSFPFLAG(fp) & (FREAD | FWRITE)) != (FREAD | FWRITE))
3103                         error = EBADF;
3104                 if (!error && newnfs_numnfsd != 0)
3105                         error = EPERM;
3106                 if (!error) {
3107                         nfsrv_stablefirst.nsf_fp = fp;
3108                         nfsrv_setupstable(p);
3109                 }
3110         } else if (uap->flag & NFSSVC_ADMINREVOKE) {
3111                 error = copyin(uap->argp, (caddr_t)&adminrevoke,
3112                     sizeof (struct nfsd_clid));
3113                 if (!error)
3114                         error = nfsrv_adminrevoke(&adminrevoke, p);
3115         } else if (uap->flag & NFSSVC_DUMPCLIENTS) {
3116                 error = copyin(uap->argp, (caddr_t)&dumplist,
3117                     sizeof (struct nfsd_dumplist));
3118                 if (!error && (dumplist.ndl_size < 1 ||
3119                         dumplist.ndl_size > NFSRV_MAXDUMPLIST))
3120                         error = EPERM;
3121                 if (!error) {
3122                     len = sizeof (struct nfsd_dumpclients) * dumplist.ndl_size;
3123                     dumpclients = (struct nfsd_dumpclients *)malloc(len,
3124                         M_TEMP, M_WAITOK);
3125                     nfsrv_dumpclients(dumpclients, dumplist.ndl_size);
3126                     error = copyout(dumpclients,
3127                         CAST_USER_ADDR_T(dumplist.ndl_list), len);
3128                     free((caddr_t)dumpclients, M_TEMP);
3129                 }
3130         } else if (uap->flag & NFSSVC_DUMPLOCKS) {
3131                 error = copyin(uap->argp, (caddr_t)&dumplocklist,
3132                     sizeof (struct nfsd_dumplocklist));
3133                 if (!error && (dumplocklist.ndllck_size < 1 ||
3134                         dumplocklist.ndllck_size > NFSRV_MAXDUMPLIST))
3135                         error = EPERM;
3136                 if (!error)
3137                         error = nfsrv_lookupfilename(&nd,
3138                                 dumplocklist.ndllck_fname, p);
3139                 if (!error) {
3140                         len = sizeof (struct nfsd_dumplocks) *
3141                                 dumplocklist.ndllck_size;
3142                         dumplocks = (struct nfsd_dumplocks *)malloc(len,
3143                                 M_TEMP, M_WAITOK);
3144                         nfsrv_dumplocks(nd.ni_vp, dumplocks,
3145                             dumplocklist.ndllck_size, p);
3146                         vput(nd.ni_vp);
3147                         error = copyout(dumplocks,
3148                             CAST_USER_ADDR_T(dumplocklist.ndllck_list), len);
3149                         free((caddr_t)dumplocks, M_TEMP);
3150                 }
3151         } else if (uap->flag & NFSSVC_BACKUPSTABLE) {
3152                 procp = p->td_proc;
3153                 PROC_LOCK(procp);
3154                 nfsd_master_pid = procp->p_pid;
3155                 bcopy(procp->p_comm, nfsd_master_comm, MAXCOMLEN + 1);
3156                 nfsd_master_start = procp->p_stats->p_start;
3157                 nfsd_master_proc = procp;
3158                 PROC_UNLOCK(procp);
3159         }
3160
3161         NFSEXITCODE(error);
3162         return (error);
3163 }
3164
3165 /*
3166  * Check exports.
3167  * Returns 0 if ok, 1 otherwise.
3168  */
3169 int
3170 nfsvno_testexp(struct nfsrv_descript *nd, struct nfsexstuff *exp)
3171 {
3172         int i;
3173
3174         /*
3175          * This seems odd, but allow the case where the security flavor
3176          * list is empty. This happens when NFSv4 is traversing non-exported
3177          * file systems. Exported file systems should always have a non-empty
3178          * security flavor list.
3179          */
3180         if (exp->nes_numsecflavor == 0)
3181                 return (0);
3182
3183         for (i = 0; i < exp->nes_numsecflavor; i++) {
3184                 /*
3185                  * The tests for privacy and integrity must be first,
3186                  * since ND_GSS is set for everything but AUTH_SYS.
3187                  */
3188                 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5P &&
3189                     (nd->nd_flag & ND_GSSPRIVACY))
3190                         return (0);
3191                 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5I &&
3192                     (nd->nd_flag & ND_GSSINTEGRITY))
3193                         return (0);
3194                 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5 &&
3195                     (nd->nd_flag & ND_GSS))
3196                         return (0);
3197                 if (exp->nes_secflavors[i] == AUTH_SYS &&
3198                     (nd->nd_flag & ND_GSS) == 0)
3199                         return (0);
3200         }
3201         return (1);
3202 }
3203
3204 /*
3205  * Calculate a hash value for the fid in a file handle.
3206  */
3207 uint32_t
3208 nfsrv_hashfh(fhandle_t *fhp)
3209 {
3210         uint32_t hashval;
3211
3212         hashval = hash32_buf(&fhp->fh_fid, sizeof(struct fid), 0);
3213         return (hashval);
3214 }
3215
3216 /*
3217  * Signal the userland master nfsd to backup the stable restart file.
3218  */
3219 void
3220 nfsrv_backupstable(void)
3221 {
3222         struct proc *procp;
3223
3224         if (nfsd_master_proc != NULL) {
3225                 procp = pfind(nfsd_master_pid);
3226                 /* Try to make sure it is the correct process. */
3227                 if (procp == nfsd_master_proc &&
3228                     procp->p_stats->p_start.tv_sec ==
3229                     nfsd_master_start.tv_sec &&
3230                     procp->p_stats->p_start.tv_usec ==
3231                     nfsd_master_start.tv_usec &&
3232                     strcmp(procp->p_comm, nfsd_master_comm) == 0)
3233                         kern_psignal(procp, SIGUSR2);
3234                 else
3235                         nfsd_master_proc = NULL;
3236
3237                 if (procp != NULL)
3238                         PROC_UNLOCK(procp);
3239         }
3240 }
3241
3242 extern int (*nfsd_call_nfsd)(struct thread *, struct nfssvc_args *);
3243
3244 /*
3245  * Called once to initialize data structures...
3246  */
3247 static int
3248 nfsd_modevent(module_t mod, int type, void *data)
3249 {
3250         int error = 0;
3251         static int loaded = 0;
3252
3253         switch (type) {
3254         case MOD_LOAD:
3255                 if (loaded)
3256                         goto out;
3257                 newnfs_portinit();
3258                 mtx_init(&nfs_cache_mutex, "nfs_cache_mutex", NULL, MTX_DEF);
3259                 mtx_init(&nfs_v4root_mutex, "nfs_v4root_mutex", NULL, MTX_DEF);
3260                 mtx_init(&nfsv4root_mnt.mnt_mtx, "struct mount mtx", NULL,
3261                     MTX_DEF);
3262                 lockinit(&nfsv4root_mnt.mnt_explock, PVFS, "explock", 0, 0);
3263                 nfsrvd_initcache();
3264                 nfsd_init();
3265                 NFSD_LOCK();
3266                 nfsrvd_init(0);
3267                 NFSD_UNLOCK();
3268                 nfsd_mntinit();
3269 #ifdef VV_DISABLEDELEG
3270                 vn_deleg_ops.vndeleg_recall = nfsd_recalldelegation;
3271                 vn_deleg_ops.vndeleg_disable = nfsd_disabledelegation;
3272 #endif
3273                 nfsd_call_servertimer = nfsrv_servertimer;
3274                 nfsd_call_nfsd = nfssvc_nfsd;
3275                 loaded = 1;
3276                 break;
3277
3278         case MOD_UNLOAD:
3279                 if (newnfs_numnfsd != 0) {
3280                         error = EBUSY;
3281                         break;
3282                 }
3283
3284 #ifdef VV_DISABLEDELEG
3285                 vn_deleg_ops.vndeleg_recall = NULL;
3286                 vn_deleg_ops.vndeleg_disable = NULL;
3287 #endif
3288                 nfsd_call_servertimer = NULL;
3289                 nfsd_call_nfsd = NULL;
3290
3291                 /* Clean out all NFSv4 state. */
3292                 nfsrv_throwawayallstate(curthread);
3293
3294                 /* Clean the NFS server reply cache */
3295                 nfsrvd_cleancache();
3296
3297                 /* Free up the krpc server pool. */
3298                 if (nfsrvd_pool != NULL)
3299                         svcpool_destroy(nfsrvd_pool);
3300
3301                 /* and get rid of the locks */
3302                 mtx_destroy(&nfs_cache_mutex);
3303                 mtx_destroy(&nfs_v4root_mutex);
3304                 mtx_destroy(&nfsv4root_mnt.mnt_mtx);
3305                 lockdestroy(&nfsv4root_mnt.mnt_explock);
3306                 loaded = 0;
3307                 break;
3308         default:
3309                 error = EOPNOTSUPP;
3310                 break;
3311         }
3312
3313 out:
3314         NFSEXITCODE(error);
3315         return (error);
3316 }
3317 static moduledata_t nfsd_mod = {
3318         "nfsd",
3319         nfsd_modevent,
3320         NULL,
3321 };
3322 DECLARE_MODULE(nfsd, nfsd_mod, SI_SUB_VFS, SI_ORDER_ANY);
3323
3324 /* So that loader and kldload(2) can find us, wherever we are.. */
3325 MODULE_VERSION(nfsd, 1);
3326 MODULE_DEPEND(nfsd, nfscommon, 1, 1, 1);
3327 MODULE_DEPEND(nfsd, nfslock, 1, 1, 1);
3328 MODULE_DEPEND(nfsd, nfslockd, 1, 1, 1);
3329 MODULE_DEPEND(nfsd, krpc, 1, 1, 1);
3330 MODULE_DEPEND(nfsd, nfssvc, 1, 1, 1);
3331