The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/nfsserver/nfs_nfsdport.c

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    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: releng/8.4/sys/fs/nfsserver/nfs_nfsdport.c 250062 2013-04-29 20:16:25Z des $");
   36 
   37 /*
   38  * Functions that perform the vfs operations required by the routines in
   39  * nfsd_serv.c. It is hoped that this change will make the server more
   40  * portable.
   41  */
   42 
   43 #include <fs/nfs/nfsport.h>
   44 #include <sys/hash.h>
   45 #include <sys/sysctl.h>
   46 #include <nlm/nlm_prot.h>
   47 #include <nlm/nlm.h>
   48 
   49 extern u_int32_t newnfs_true, newnfs_false, newnfs_xdrneg1;
   50 extern int nfsrv_useacl;
   51 extern int newnfs_numnfsd;
   52 extern struct mount nfsv4root_mnt;
   53 extern struct nfsrv_stablefirst nfsrv_stablefirst;
   54 extern void (*nfsd_call_servertimer)(void);
   55 extern SVCPOOL  *nfsrvd_pool;
   56 struct vfsoptlist nfsv4root_opt, nfsv4root_newopt;
   57 NFSDLOCKMUTEX;
   58 struct mtx nfs_cache_mutex;
   59 struct mtx nfs_v4root_mutex;
   60 struct nfsrvfh nfs_rootfh, nfs_pubfh;
   61 int nfs_pubfhset = 0, nfs_rootfhset = 0;
   62 struct proc *nfsd_master_proc = NULL;
   63 static pid_t nfsd_master_pid = (pid_t)-1;
   64 static char nfsd_master_comm[MAXCOMLEN + 1];
   65 static struct timeval nfsd_master_start;
   66 static uint32_t nfsv4_sysid = 0;
   67 
   68 static int nfssvc_srvcall(struct thread *, struct nfssvc_args *,
   69     struct ucred *);
   70 
   71 int nfsrv_enable_crossmntpt = 1;
   72 static int nfs_commit_blks;
   73 static int nfs_commit_miss;
   74 extern int nfsrv_issuedelegs;
   75 extern int nfsrv_dolocallocks;
   76 
   77 SYSCTL_DECL(_vfs_newnfs);
   78 SYSCTL_INT(_vfs_newnfs, OID_AUTO, mirrormnt, CTLFLAG_RW,
   79     &nfsrv_enable_crossmntpt, 0, "Enable nfsd to cross mount points");
   80 SYSCTL_INT(_vfs_newnfs, OID_AUTO, commit_blks, CTLFLAG_RW, &nfs_commit_blks,
   81     0, "");
   82 SYSCTL_INT(_vfs_newnfs, OID_AUTO, commit_miss, CTLFLAG_RW, &nfs_commit_miss,
   83     0, "");
   84 SYSCTL_INT(_vfs_newnfs, OID_AUTO, issue_delegations, CTLFLAG_RW,
   85     &nfsrv_issuedelegs, 0, "Enable nfsd to issue delegations");
   86 SYSCTL_INT(_vfs_newnfs, OID_AUTO, enable_locallocks, CTLFLAG_RW,
   87     &nfsrv_dolocallocks, 0, "Enable nfsd to acquire local locks on files");
   88 
   89 #define MAX_REORDERED_RPC       16
   90 #define NUM_HEURISTIC           1031
   91 #define NHUSE_INIT              64
   92 #define NHUSE_INC               16
   93 #define NHUSE_MAX               2048
   94 
   95 static struct nfsheur {
   96         struct vnode *nh_vp;    /* vp to match (unreferenced pointer) */
   97         off_t nh_nextoff;       /* next offset for sequential detection */
   98         int nh_use;             /* use count for selection */
   99         int nh_seqcount;        /* heuristic */
  100 } nfsheur[NUM_HEURISTIC];
  101 
  102 
  103 /*
  104  * Heuristic to detect sequential operation.
  105  */
  106 static struct nfsheur *
  107 nfsrv_sequential_heuristic(struct uio *uio, struct vnode *vp)
  108 {
  109         struct nfsheur *nh;
  110         int hi, try;
  111 
  112         /* Locate best candidate. */
  113         try = 32;
  114         hi = ((int)(vm_offset_t)vp / sizeof(struct vnode)) % NUM_HEURISTIC;
  115         nh = &nfsheur[hi];
  116         while (try--) {
  117                 if (nfsheur[hi].nh_vp == vp) {
  118                         nh = &nfsheur[hi];
  119                         break;
  120                 }
  121                 if (nfsheur[hi].nh_use > 0)
  122                         --nfsheur[hi].nh_use;
  123                 hi = (hi + 1) % NUM_HEURISTIC;
  124                 if (nfsheur[hi].nh_use < nh->nh_use)
  125                         nh = &nfsheur[hi];
  126         }
  127 
  128         /* Initialize hint if this is a new file. */
  129         if (nh->nh_vp != vp) {
  130                 nh->nh_vp = vp;
  131                 nh->nh_nextoff = uio->uio_offset;
  132                 nh->nh_use = NHUSE_INIT;
  133                 if (uio->uio_offset == 0)
  134                         nh->nh_seqcount = 4;
  135                 else
  136                         nh->nh_seqcount = 1;
  137         }
  138 
  139         /* Calculate heuristic. */
  140         if ((uio->uio_offset == 0 && nh->nh_seqcount > 0) ||
  141             uio->uio_offset == nh->nh_nextoff) {
  142                 /* See comments in vfs_vnops.c:sequential_heuristic(). */
  143                 nh->nh_seqcount += howmany(uio->uio_resid, 16384);
  144                 if (nh->nh_seqcount > IO_SEQMAX)
  145                         nh->nh_seqcount = IO_SEQMAX;
  146         } else if (qabs(uio->uio_offset - nh->nh_nextoff) <= MAX_REORDERED_RPC *
  147             imax(vp->v_mount->mnt_stat.f_iosize, uio->uio_resid)) {
  148                 /* Probably a reordered RPC, leave seqcount alone. */
  149         } else if (nh->nh_seqcount > 1) {
  150                 nh->nh_seqcount /= 2;
  151         } else {
  152                 nh->nh_seqcount = 0;
  153         }
  154         nh->nh_use += NHUSE_INC;
  155         if (nh->nh_use > NHUSE_MAX)
  156                 nh->nh_use = NHUSE_MAX;
  157         return (nh);
  158 }
  159 
  160 /*
  161  * Get attributes into nfsvattr structure.
  162  */
  163 int
  164 nfsvno_getattr(struct vnode *vp, struct nfsvattr *nvap, struct ucred *cred,
  165     struct thread *p, int vpislocked)
  166 {
  167         int error, lockedit = 0;
  168 
  169         if (vpislocked == 0) {
  170                 /*
  171                  * When vpislocked == 0, the vnode is either exclusively
  172                  * locked by this thread or not locked by this thread.
  173                  * As such, shared lock it, if not exclusively locked.
  174                  */
  175                 if (NFSVOPISLOCKED(vp) != LK_EXCLUSIVE) {
  176                         lockedit = 1;
  177                         NFSVOPLOCK(vp, LK_SHARED | LK_RETRY);
  178                 }
  179         }
  180         error = VOP_GETATTR(vp, &nvap->na_vattr, cred);
  181         if (lockedit != 0)
  182                 NFSVOPUNLOCK(vp, 0);
  183 
  184         NFSEXITCODE(error);
  185         return (error);
  186 }
  187 
  188 /*
  189  * Get a file handle for a vnode.
  190  */
  191 int
  192 nfsvno_getfh(struct vnode *vp, fhandle_t *fhp, struct thread *p)
  193 {
  194         int error;
  195 
  196         NFSBZERO((caddr_t)fhp, sizeof(fhandle_t));
  197         fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid;
  198         error = VOP_VPTOFH(vp, &fhp->fh_fid);
  199 
  200         NFSEXITCODE(error);
  201         return (error);
  202 }
  203 
  204 /*
  205  * Perform access checking for vnodes obtained from file handles that would
  206  * refer to files already opened by a Unix client. You cannot just use
  207  * vn_writechk() and VOP_ACCESSX() for two reasons.
  208  * 1 - You must check for exported rdonly as well as MNT_RDONLY for the write
  209  *     case.
  210  * 2 - The owner is to be given access irrespective of mode bits for some
  211  *     operations, so that processes that chmod after opening a file don't
  212  *     break.
  213  */
  214 int
  215 nfsvno_accchk(struct vnode *vp, accmode_t accmode, struct ucred *cred,
  216     struct nfsexstuff *exp, struct thread *p, int override, int vpislocked,
  217     u_int32_t *supportedtypep)
  218 {
  219         struct vattr vattr;
  220         int error = 0, getret = 0;
  221 
  222         if (vpislocked == 0) {
  223                 if (NFSVOPLOCK(vp, LK_SHARED) != 0) {
  224                         error = EPERM;
  225                         goto out;
  226                 }
  227         }
  228         if (accmode & VWRITE) {
  229                 /* Just vn_writechk() changed to check rdonly */
  230                 /*
  231                  * Disallow write attempts on read-only file systems;
  232                  * unless the file is a socket or a block or character
  233                  * device resident on the file system.
  234                  */
  235                 if (NFSVNO_EXRDONLY(exp) ||
  236                     (vp->v_mount->mnt_flag & MNT_RDONLY)) {
  237                         switch (vp->v_type) {
  238                         case VREG:
  239                         case VDIR:
  240                         case VLNK:
  241                                 error = EROFS;
  242                         default:
  243                                 break;
  244                         }
  245                 }
  246                 /*
  247                  * If there's shared text associated with
  248                  * the inode, try to free it up once.  If
  249                  * we fail, we can't allow writing.
  250                  */
  251                 if ((vp->v_vflag & VV_TEXT) != 0 && error == 0)
  252                         error = ETXTBSY;
  253         }
  254         if (error != 0) {
  255                 if (vpislocked == 0)
  256                         NFSVOPUNLOCK(vp, 0);
  257                 goto out;
  258         }
  259 
  260         /*
  261          * Should the override still be applied when ACLs are enabled?
  262          */
  263         error = VOP_ACCESSX(vp, accmode, cred, p);
  264         if (error != 0 && (accmode & (VDELETE | VDELETE_CHILD))) {
  265                 /*
  266                  * Try again with VEXPLICIT_DENY, to see if the test for
  267                  * deletion is supported.
  268                  */
  269                 error = VOP_ACCESSX(vp, accmode | VEXPLICIT_DENY, cred, p);
  270                 if (error == 0) {
  271                         if (vp->v_type == VDIR) {
  272                                 accmode &= ~(VDELETE | VDELETE_CHILD);
  273                                 accmode |= VWRITE;
  274                                 error = VOP_ACCESSX(vp, accmode, cred, p);
  275                         } else if (supportedtypep != NULL) {
  276                                 *supportedtypep &= ~NFSACCESS_DELETE;
  277                         }
  278                 }
  279         }
  280 
  281         /*
  282          * Allow certain operations for the owner (reads and writes
  283          * on files that are already open).
  284          */
  285         if (override != NFSACCCHK_NOOVERRIDE &&
  286             (error == EPERM || error == EACCES)) {
  287                 if (cred->cr_uid == 0 && (override & NFSACCCHK_ALLOWROOT))
  288                         error = 0;
  289                 else if (override & NFSACCCHK_ALLOWOWNER) {
  290                         getret = VOP_GETATTR(vp, &vattr, cred);
  291                         if (getret == 0 && cred->cr_uid == vattr.va_uid)
  292                                 error = 0;
  293                 }
  294         }
  295         if (vpislocked == 0)
  296                 NFSVOPUNLOCK(vp, 0);
  297 
  298 out:
  299         NFSEXITCODE(error);
  300         return (error);
  301 }
  302 
  303 /*
  304  * Set attribute(s) vnop.
  305  */
  306 int
  307 nfsvno_setattr(struct vnode *vp, struct nfsvattr *nvap, struct ucred *cred,
  308     struct thread *p, struct nfsexstuff *exp)
  309 {
  310         int error;
  311 
  312         error = VOP_SETATTR(vp, &nvap->na_vattr, cred);
  313         NFSEXITCODE(error);
  314         return (error);
  315 }
  316 
  317 /*
  318  * Set up nameidata for a lookup() call and do it.
  319  */
  320 int
  321 nfsvno_namei(struct nfsrv_descript *nd, struct nameidata *ndp,
  322     struct vnode *dp, int islocked, struct nfsexstuff *exp, struct thread *p,
  323     struct vnode **retdirp)
  324 {
  325         struct componentname *cnp = &ndp->ni_cnd;
  326         int i;
  327         struct iovec aiov;
  328         struct uio auio;
  329         int lockleaf = (cnp->cn_flags & LOCKLEAF) != 0, linklen;
  330         int error = 0, crossmnt;
  331         char *cp;
  332 
  333         *retdirp = NULL;
  334         cnp->cn_nameptr = cnp->cn_pnbuf;
  335         /*
  336          * Extract and set starting directory.
  337          */
  338         if (dp->v_type != VDIR) {
  339                 if (islocked)
  340                         vput(dp);
  341                 else
  342                         vrele(dp);
  343                 nfsvno_relpathbuf(ndp);
  344                 error = ENOTDIR;
  345                 goto out1;
  346         }
  347         if (islocked)
  348                 NFSVOPUNLOCK(dp, 0);
  349         VREF(dp);
  350         *retdirp = dp;
  351         if (NFSVNO_EXRDONLY(exp))
  352                 cnp->cn_flags |= RDONLY;
  353         ndp->ni_segflg = UIO_SYSSPACE;
  354         crossmnt = 1;
  355 
  356         if (nd->nd_flag & ND_PUBLOOKUP) {
  357                 ndp->ni_loopcnt = 0;
  358                 if (cnp->cn_pnbuf[0] == '/') {
  359                         vrele(dp);
  360                         /*
  361                          * Check for degenerate pathnames here, since lookup()
  362                          * panics on them.
  363                          */
  364                         for (i = 1; i < ndp->ni_pathlen; i++)
  365                                 if (cnp->cn_pnbuf[i] != '/')
  366                                         break;
  367                         if (i == ndp->ni_pathlen) {
  368                                 error = NFSERR_ACCES;
  369                                 goto out;
  370                         }
  371                         dp = rootvnode;
  372                         VREF(dp);
  373                 }
  374         } else if ((nfsrv_enable_crossmntpt == 0 && NFSVNO_EXPORTED(exp)) ||
  375             (nd->nd_flag & ND_NFSV4) == 0) {
  376                 /*
  377                  * Only cross mount points for NFSv4 when doing a
  378                  * mount while traversing the file system above
  379                  * the mount point, unless nfsrv_enable_crossmntpt is set.
  380                  */
  381                 cnp->cn_flags |= NOCROSSMOUNT;
  382                 crossmnt = 0;
  383         }
  384 
  385         /*
  386          * Initialize for scan, set ni_startdir and bump ref on dp again
  387          * becuase lookup() will dereference ni_startdir.
  388          */
  389 
  390         cnp->cn_thread = p;
  391         ndp->ni_startdir = dp;
  392         ndp->ni_rootdir = rootvnode;
  393         ndp->ni_topdir = NULL;
  394 
  395         if (!lockleaf)
  396                 cnp->cn_flags |= LOCKLEAF;
  397         for (;;) {
  398                 cnp->cn_nameptr = cnp->cn_pnbuf;
  399                 /*
  400                  * Call lookup() to do the real work.  If an error occurs,
  401                  * ndp->ni_vp and ni_dvp are left uninitialized or NULL and
  402                  * we do not have to dereference anything before returning.
  403                  * In either case ni_startdir will be dereferenced and NULLed
  404                  * out.
  405                  */
  406                 error = lookup(ndp);
  407                 if (error)
  408                         break;
  409 
  410                 /*
  411                  * Check for encountering a symbolic link.  Trivial
  412                  * termination occurs if no symlink encountered.
  413                  */
  414                 if ((cnp->cn_flags & ISSYMLINK) == 0) {
  415                         if ((cnp->cn_flags & (SAVENAME | SAVESTART)) == 0)
  416                                 nfsvno_relpathbuf(ndp);
  417                         if (ndp->ni_vp && !lockleaf)
  418                                 NFSVOPUNLOCK(ndp->ni_vp, 0);
  419                         break;
  420                 }
  421 
  422                 /*
  423                  * Validate symlink
  424                  */
  425                 if ((cnp->cn_flags & LOCKPARENT) && ndp->ni_pathlen == 1)
  426                         NFSVOPUNLOCK(ndp->ni_dvp, 0);
  427                 if (!(nd->nd_flag & ND_PUBLOOKUP)) {
  428                         error = EINVAL;
  429                         goto badlink2;
  430                 }
  431 
  432                 if (ndp->ni_loopcnt++ >= MAXSYMLINKS) {
  433                         error = ELOOP;
  434                         goto badlink2;
  435                 }
  436                 if (ndp->ni_pathlen > 1)
  437                         cp = uma_zalloc(namei_zone, M_WAITOK);
  438                 else
  439                         cp = cnp->cn_pnbuf;
  440                 aiov.iov_base = cp;
  441                 aiov.iov_len = MAXPATHLEN;
  442                 auio.uio_iov = &aiov;
  443                 auio.uio_iovcnt = 1;
  444                 auio.uio_offset = 0;
  445                 auio.uio_rw = UIO_READ;
  446                 auio.uio_segflg = UIO_SYSSPACE;
  447                 auio.uio_td = NULL;
  448                 auio.uio_resid = MAXPATHLEN;
  449                 error = VOP_READLINK(ndp->ni_vp, &auio, cnp->cn_cred);
  450                 if (error) {
  451                 badlink1:
  452                         if (ndp->ni_pathlen > 1)
  453                                 uma_zfree(namei_zone, cp);
  454                 badlink2:
  455                         vrele(ndp->ni_dvp);
  456                         vput(ndp->ni_vp);
  457                         break;
  458                 }
  459                 linklen = MAXPATHLEN - auio.uio_resid;
  460                 if (linklen == 0) {
  461                         error = ENOENT;
  462                         goto badlink1;
  463                 }
  464                 if (linklen + ndp->ni_pathlen >= MAXPATHLEN) {
  465                         error = ENAMETOOLONG;
  466                         goto badlink1;
  467                 }
  468 
  469                 /*
  470                  * Adjust or replace path
  471                  */
  472                 if (ndp->ni_pathlen > 1) {
  473                         NFSBCOPY(ndp->ni_next, cp + linklen, ndp->ni_pathlen);
  474                         uma_zfree(namei_zone, cnp->cn_pnbuf);
  475                         cnp->cn_pnbuf = cp;
  476                 } else
  477                         cnp->cn_pnbuf[linklen] = '\0';
  478                 ndp->ni_pathlen += linklen;
  479 
  480                 /*
  481                  * Cleanup refs for next loop and check if root directory
  482                  * should replace current directory.  Normally ni_dvp
  483                  * becomes the new base directory and is cleaned up when
  484                  * we loop.  Explicitly null pointers after invalidation
  485                  * to clarify operation.
  486                  */
  487                 vput(ndp->ni_vp);
  488                 ndp->ni_vp = NULL;
  489 
  490                 if (cnp->cn_pnbuf[0] == '/') {
  491                         vrele(ndp->ni_dvp);
  492                         ndp->ni_dvp = ndp->ni_rootdir;
  493                         VREF(ndp->ni_dvp);
  494                 }
  495                 ndp->ni_startdir = ndp->ni_dvp;
  496                 ndp->ni_dvp = NULL;
  497         }
  498         if (!lockleaf)
  499                 cnp->cn_flags &= ~LOCKLEAF;
  500 
  501 out:
  502         if (error) {
  503                 uma_zfree(namei_zone, cnp->cn_pnbuf);
  504                 ndp->ni_vp = NULL;
  505                 ndp->ni_dvp = NULL;
  506                 ndp->ni_startdir = NULL;
  507                 cnp->cn_flags &= ~HASBUF;
  508         } else if ((ndp->ni_cnd.cn_flags & (WANTPARENT|LOCKPARENT)) == 0) {
  509                 ndp->ni_dvp = NULL;
  510         }
  511 
  512 out1:
  513         NFSEXITCODE2(error, nd);
  514         return (error);
  515 }
  516 
  517 /*
  518  * Set up a pathname buffer and return a pointer to it and, optionally
  519  * set a hash pointer.
  520  */
  521 void
  522 nfsvno_setpathbuf(struct nameidata *ndp, char **bufpp, u_long **hashpp)
  523 {
  524         struct componentname *cnp = &ndp->ni_cnd;
  525 
  526         cnp->cn_flags |= (NOMACCHECK | HASBUF);
  527         cnp->cn_pnbuf = uma_zalloc(namei_zone, M_WAITOK);
  528         if (hashpp != NULL)
  529                 *hashpp = NULL;
  530         *bufpp = cnp->cn_pnbuf;
  531 }
  532 
  533 /*
  534  * Release the above path buffer, if not released by nfsvno_namei().
  535  */
  536 void
  537 nfsvno_relpathbuf(struct nameidata *ndp)
  538 {
  539 
  540         if ((ndp->ni_cnd.cn_flags & HASBUF) == 0)
  541                 panic("nfsrelpath");
  542         uma_zfree(namei_zone, ndp->ni_cnd.cn_pnbuf);
  543         ndp->ni_cnd.cn_flags &= ~HASBUF;
  544 }
  545 
  546 /*
  547  * Readlink vnode op into an mbuf list.
  548  */
  549 int
  550 nfsvno_readlink(struct vnode *vp, struct ucred *cred, struct thread *p,
  551     struct mbuf **mpp, struct mbuf **mpendp, int *lenp)
  552 {
  553         struct iovec iv[(NFS_MAXPATHLEN+MLEN-1)/MLEN];
  554         struct iovec *ivp = iv;
  555         struct uio io, *uiop = &io;
  556         struct mbuf *mp, *mp2 = NULL, *mp3 = NULL;
  557         int i, len, tlen, error = 0;
  558 
  559         len = 0;
  560         i = 0;
  561         while (len < NFS_MAXPATHLEN) {
  562                 NFSMGET(mp);
  563                 MCLGET(mp, M_WAIT);
  564                 mp->m_len = NFSMSIZ(mp);
  565                 if (len == 0) {
  566                         mp3 = mp2 = mp;
  567                 } else {
  568                         mp2->m_next = mp;
  569                         mp2 = mp;
  570                 }
  571                 if ((len + mp->m_len) > NFS_MAXPATHLEN) {
  572                         mp->m_len = NFS_MAXPATHLEN - len;
  573                         len = NFS_MAXPATHLEN;
  574                 } else {
  575                         len += mp->m_len;
  576                 }
  577                 ivp->iov_base = mtod(mp, caddr_t);
  578                 ivp->iov_len = mp->m_len;
  579                 i++;
  580                 ivp++;
  581         }
  582         uiop->uio_iov = iv;
  583         uiop->uio_iovcnt = i;
  584         uiop->uio_offset = 0;
  585         uiop->uio_resid = len;
  586         uiop->uio_rw = UIO_READ;
  587         uiop->uio_segflg = UIO_SYSSPACE;
  588         uiop->uio_td = NULL;
  589         error = VOP_READLINK(vp, uiop, cred);
  590         if (error) {
  591                 m_freem(mp3);
  592                 *lenp = 0;
  593                 goto out;
  594         }
  595         if (uiop->uio_resid > 0) {
  596                 len -= uiop->uio_resid;
  597                 tlen = NFSM_RNDUP(len);
  598                 nfsrv_adj(mp3, NFS_MAXPATHLEN - tlen, tlen - len);
  599         }
  600         *lenp = len;
  601         *mpp = mp3;
  602         *mpendp = mp;
  603 
  604 out:
  605         NFSEXITCODE(error);
  606         return (error);
  607 }
  608 
  609 /*
  610  * Read vnode op call into mbuf list.
  611  */
  612 int
  613 nfsvno_read(struct vnode *vp, off_t off, int cnt, struct ucred *cred,
  614     struct thread *p, struct mbuf **mpp, struct mbuf **mpendp)
  615 {
  616         struct mbuf *m;
  617         int i;
  618         struct iovec *iv;
  619         struct iovec *iv2;
  620         int error = 0, len, left, siz, tlen, ioflag = 0;
  621         struct mbuf *m2 = NULL, *m3;
  622         struct uio io, *uiop = &io;
  623         struct nfsheur *nh;
  624 
  625         len = left = NFSM_RNDUP(cnt);
  626         m3 = NULL;
  627         /*
  628          * Generate the mbuf list with the uio_iov ref. to it.
  629          */
  630         i = 0;
  631         while (left > 0) {
  632                 NFSMGET(m);
  633                 MCLGET(m, M_WAIT);
  634                 m->m_len = 0;
  635                 siz = min(M_TRAILINGSPACE(m), left);
  636                 left -= siz;
  637                 i++;
  638                 if (m3)
  639                         m2->m_next = m;
  640                 else
  641                         m3 = m;
  642                 m2 = m;
  643         }
  644         MALLOC(iv, struct iovec *, i * sizeof (struct iovec),
  645             M_TEMP, M_WAITOK);
  646         uiop->uio_iov = iv2 = iv;
  647         m = m3;
  648         left = len;
  649         i = 0;
  650         while (left > 0) {
  651                 if (m == NULL)
  652                         panic("nfsvno_read iov");
  653                 siz = min(M_TRAILINGSPACE(m), left);
  654                 if (siz > 0) {
  655                         iv->iov_base = mtod(m, caddr_t) + m->m_len;
  656                         iv->iov_len = siz;
  657                         m->m_len += siz;
  658                         left -= siz;
  659                         iv++;
  660                         i++;
  661                 }
  662                 m = m->m_next;
  663         }
  664         uiop->uio_iovcnt = i;
  665         uiop->uio_offset = off;
  666         uiop->uio_resid = len;
  667         uiop->uio_rw = UIO_READ;
  668         uiop->uio_segflg = UIO_SYSSPACE;
  669         nh = nfsrv_sequential_heuristic(uiop, vp);
  670         ioflag |= nh->nh_seqcount << IO_SEQSHIFT;
  671         error = VOP_READ(vp, uiop, IO_NODELOCKED | ioflag, cred);
  672         FREE((caddr_t)iv2, M_TEMP);
  673         if (error) {
  674                 m_freem(m3);
  675                 *mpp = NULL;
  676                 goto out;
  677         }
  678         nh->nh_nextoff = uiop->uio_offset;
  679         tlen = len - uiop->uio_resid;
  680         cnt = cnt < tlen ? cnt : tlen;
  681         tlen = NFSM_RNDUP(cnt);
  682         if (tlen == 0) {
  683                 m_freem(m3);
  684                 m3 = NULL;
  685         } else if (len != tlen || tlen != cnt)
  686                 nfsrv_adj(m3, len - tlen, tlen - cnt);
  687         *mpp = m3;
  688         *mpendp = m2;
  689 
  690 out:
  691         NFSEXITCODE(error);
  692         return (error);
  693 }
  694 
  695 /*
  696  * Write vnode op from an mbuf list.
  697  */
  698 int
  699 nfsvno_write(struct vnode *vp, off_t off, int retlen, int cnt, int stable,
  700     struct mbuf *mp, char *cp, struct ucred *cred, struct thread *p)
  701 {
  702         struct iovec *ivp;
  703         int i, len;
  704         struct iovec *iv;
  705         int ioflags, error;
  706         struct uio io, *uiop = &io;
  707         struct nfsheur *nh;
  708 
  709         MALLOC(ivp, struct iovec *, cnt * sizeof (struct iovec), M_TEMP,
  710             M_WAITOK);
  711         uiop->uio_iov = iv = ivp;
  712         uiop->uio_iovcnt = cnt;
  713         i = mtod(mp, caddr_t) + mp->m_len - cp;
  714         len = retlen;
  715         while (len > 0) {
  716                 if (mp == NULL)
  717                         panic("nfsvno_write");
  718                 if (i > 0) {
  719                         i = min(i, len);
  720                         ivp->iov_base = cp;
  721                         ivp->iov_len = i;
  722                         ivp++;
  723                         len -= i;
  724                 }
  725                 mp = mp->m_next;
  726                 if (mp) {
  727                         i = mp->m_len;
  728                         cp = mtod(mp, caddr_t);
  729                 }
  730         }
  731 
  732         if (stable == NFSWRITE_UNSTABLE)
  733                 ioflags = IO_NODELOCKED;
  734         else
  735                 ioflags = (IO_SYNC | IO_NODELOCKED);
  736         uiop->uio_resid = retlen;
  737         uiop->uio_rw = UIO_WRITE;
  738         uiop->uio_segflg = UIO_SYSSPACE;
  739         NFSUIOPROC(uiop, p);
  740         uiop->uio_offset = off;
  741         nh = nfsrv_sequential_heuristic(uiop, vp);
  742         ioflags |= nh->nh_seqcount << IO_SEQSHIFT;
  743         error = VOP_WRITE(vp, uiop, ioflags, cred);
  744         if (error == 0)
  745                 nh->nh_nextoff = uiop->uio_offset;
  746         FREE((caddr_t)iv, M_TEMP);
  747 
  748         NFSEXITCODE(error);
  749         return (error);
  750 }
  751 
  752 /*
  753  * Common code for creating a regular file (plus special files for V2).
  754  */
  755 int
  756 nfsvno_createsub(struct nfsrv_descript *nd, struct nameidata *ndp,
  757     struct vnode **vpp, struct nfsvattr *nvap, int *exclusive_flagp,
  758     int32_t *cverf, NFSDEV_T rdev, struct thread *p, struct nfsexstuff *exp)
  759 {
  760         u_quad_t tempsize;
  761         int error;
  762 
  763         error = nd->nd_repstat;
  764         if (!error && ndp->ni_vp == NULL) {
  765                 if (nvap->na_type == VREG || nvap->na_type == VSOCK) {
  766                         vrele(ndp->ni_startdir);
  767                         error = VOP_CREATE(ndp->ni_dvp,
  768                             &ndp->ni_vp, &ndp->ni_cnd, &nvap->na_vattr);
  769                         vput(ndp->ni_dvp);
  770                         nfsvno_relpathbuf(ndp);
  771                         if (!error) {
  772                                 if (*exclusive_flagp) {
  773                                         *exclusive_flagp = 0;
  774                                         NFSVNO_ATTRINIT(nvap);
  775                                         nvap->na_atime.tv_sec = cverf[0];
  776                                         nvap->na_atime.tv_nsec = cverf[1];
  777                                         error = VOP_SETATTR(ndp->ni_vp,
  778                                             &nvap->na_vattr, nd->nd_cred);
  779                                 }
  780                         }
  781                 /*
  782                  * NFS V2 Only. nfsrvd_mknod() does this for V3.
  783                  * (This implies, just get out on an error.)
  784                  */
  785                 } else if (nvap->na_type == VCHR || nvap->na_type == VBLK ||
  786                         nvap->na_type == VFIFO) {
  787                         if (nvap->na_type == VCHR && rdev == 0xffffffff)
  788                                 nvap->na_type = VFIFO;
  789                         if (nvap->na_type != VFIFO &&
  790                             (error = priv_check_cred(nd->nd_cred,
  791                              PRIV_VFS_MKNOD_DEV, 0))) {
  792                                 vrele(ndp->ni_startdir);
  793                                 nfsvno_relpathbuf(ndp);
  794                                 vput(ndp->ni_dvp);
  795                                 goto out;
  796                         }
  797                         nvap->na_rdev = rdev;
  798                         error = VOP_MKNOD(ndp->ni_dvp, &ndp->ni_vp,
  799                             &ndp->ni_cnd, &nvap->na_vattr);
  800                         vput(ndp->ni_dvp);
  801                         nfsvno_relpathbuf(ndp);
  802                         vrele(ndp->ni_startdir);
  803                         if (error)
  804                                 goto out;
  805                 } else {
  806                         vrele(ndp->ni_startdir);
  807                         nfsvno_relpathbuf(ndp);
  808                         vput(ndp->ni_dvp);
  809                         error = ENXIO;
  810                         goto out;
  811                 }
  812                 *vpp = ndp->ni_vp;
  813         } else {
  814                 /*
  815                  * Handle cases where error is already set and/or
  816                  * the file exists.
  817                  * 1 - clean up the lookup
  818                  * 2 - iff !error and na_size set, truncate it
  819                  */
  820                 vrele(ndp->ni_startdir);
  821                 nfsvno_relpathbuf(ndp);
  822                 *vpp = ndp->ni_vp;
  823                 if (ndp->ni_dvp == *vpp)
  824                         vrele(ndp->ni_dvp);
  825                 else
  826                         vput(ndp->ni_dvp);
  827                 if (!error && nvap->na_size != VNOVAL) {
  828                         error = nfsvno_accchk(*vpp, VWRITE,
  829                             nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
  830                             NFSACCCHK_VPISLOCKED, NULL);
  831                         if (!error) {
  832                                 tempsize = nvap->na_size;
  833                                 NFSVNO_ATTRINIT(nvap);
  834                                 nvap->na_size = tempsize;
  835                                 error = VOP_SETATTR(*vpp,
  836                                     &nvap->na_vattr, nd->nd_cred);
  837                         }
  838                 }
  839                 if (error)
  840                         vput(*vpp);
  841         }
  842 
  843 out:
  844         NFSEXITCODE(error);
  845         return (error);
  846 }
  847 
  848 /*
  849  * Do a mknod vnode op.
  850  */
  851 int
  852 nfsvno_mknod(struct nameidata *ndp, struct nfsvattr *nvap, struct ucred *cred,
  853     struct thread *p)
  854 {
  855         int error = 0;
  856         enum vtype vtyp;
  857 
  858         vtyp = nvap->na_type;
  859         /*
  860          * Iff doesn't exist, create it.
  861          */
  862         if (ndp->ni_vp) {
  863                 vrele(ndp->ni_startdir);
  864                 nfsvno_relpathbuf(ndp);
  865                 vput(ndp->ni_dvp);
  866                 vrele(ndp->ni_vp);
  867                 error = EEXIST;
  868                 goto out;
  869         }
  870         if (vtyp != VCHR && vtyp != VBLK && vtyp != VSOCK && vtyp != VFIFO) {
  871                 vrele(ndp->ni_startdir);
  872                 nfsvno_relpathbuf(ndp);
  873                 vput(ndp->ni_dvp);
  874                 error = NFSERR_BADTYPE;
  875                 goto out;
  876         }
  877         if (vtyp == VSOCK) {
  878                 vrele(ndp->ni_startdir);
  879                 error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp,
  880                     &ndp->ni_cnd, &nvap->na_vattr);
  881                 vput(ndp->ni_dvp);
  882                 nfsvno_relpathbuf(ndp);
  883         } else {
  884                 if (nvap->na_type != VFIFO &&
  885                     (error = priv_check_cred(cred, PRIV_VFS_MKNOD_DEV, 0))) {
  886                         vrele(ndp->ni_startdir);
  887                         nfsvno_relpathbuf(ndp);
  888                         vput(ndp->ni_dvp);
  889                         goto out;
  890                 }
  891                 error = VOP_MKNOD(ndp->ni_dvp, &ndp->ni_vp,
  892                     &ndp->ni_cnd, &nvap->na_vattr);
  893                 vput(ndp->ni_dvp);
  894                 nfsvno_relpathbuf(ndp);
  895                 vrele(ndp->ni_startdir);
  896                 /*
  897                  * Since VOP_MKNOD returns the ni_vp, I can't
  898                  * see any reason to do the lookup.
  899                  */
  900         }
  901 
  902 out:
  903         NFSEXITCODE(error);
  904         return (error);
  905 }
  906 
  907 /*
  908  * Mkdir vnode op.
  909  */
  910 int
  911 nfsvno_mkdir(struct nameidata *ndp, struct nfsvattr *nvap, uid_t saved_uid,
  912     struct ucred *cred, struct thread *p, struct nfsexstuff *exp)
  913 {
  914         int error = 0;
  915 
  916         if (ndp->ni_vp != NULL) {
  917                 if (ndp->ni_dvp == ndp->ni_vp)
  918                         vrele(ndp->ni_dvp);
  919                 else
  920                         vput(ndp->ni_dvp);
  921                 vrele(ndp->ni_vp);
  922                 nfsvno_relpathbuf(ndp);
  923                 error = EEXIST;
  924                 goto out;
  925         }
  926         error = VOP_MKDIR(ndp->ni_dvp, &ndp->ni_vp, &ndp->ni_cnd,
  927             &nvap->na_vattr);
  928         vput(ndp->ni_dvp);
  929         nfsvno_relpathbuf(ndp);
  930 
  931 out:
  932         NFSEXITCODE(error);
  933         return (error);
  934 }
  935 
  936 /*
  937  * symlink vnode op.
  938  */
  939 int
  940 nfsvno_symlink(struct nameidata *ndp, struct nfsvattr *nvap, char *pathcp,
  941     int pathlen, int not_v2, uid_t saved_uid, struct ucred *cred, struct thread *p,
  942     struct nfsexstuff *exp)
  943 {
  944         int error = 0;
  945 
  946         if (ndp->ni_vp) {
  947                 vrele(ndp->ni_startdir);
  948                 nfsvno_relpathbuf(ndp);
  949                 if (ndp->ni_dvp == ndp->ni_vp)
  950                         vrele(ndp->ni_dvp);
  951                 else
  952                         vput(ndp->ni_dvp);
  953                 vrele(ndp->ni_vp);
  954                 error = EEXIST;
  955                 goto out;
  956         }
  957 
  958         error = VOP_SYMLINK(ndp->ni_dvp, &ndp->ni_vp, &ndp->ni_cnd,
  959             &nvap->na_vattr, pathcp);
  960         vput(ndp->ni_dvp);
  961         vrele(ndp->ni_startdir);
  962         nfsvno_relpathbuf(ndp);
  963         /*
  964          * Although FreeBSD still had the lookup code in
  965          * it for 7/current, there doesn't seem to be any
  966          * point, since VOP_SYMLINK() returns the ni_vp.
  967          * Just vput it for v2.
  968          */
  969         if (!not_v2 && !error)
  970                 vput(ndp->ni_vp);
  971 
  972 out:
  973         NFSEXITCODE(error);
  974         return (error);
  975 }
  976 
  977 /*
  978  * Parse symbolic link arguments.
  979  * This function has an ugly side effect. It will MALLOC() an area for
  980  * the symlink and set iov_base to point to it, only if it succeeds.
  981  * So, if it returns with uiop->uio_iov->iov_base != NULL, that must
  982  * be FREE'd later.
  983  */
  984 int
  985 nfsvno_getsymlink(struct nfsrv_descript *nd, struct nfsvattr *nvap,
  986     struct thread *p, char **pathcpp, int *lenp)
  987 {
  988         u_int32_t *tl;
  989         char *pathcp = NULL;
  990         int error = 0, len;
  991         struct nfsv2_sattr *sp;
  992 
  993         *pathcpp = NULL;
  994         *lenp = 0;
  995         if ((nd->nd_flag & ND_NFSV3) &&
  996             (error = nfsrv_sattr(nd, nvap, NULL, NULL, p)))
  997                 goto nfsmout;
  998         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
  999         len = fxdr_unsigned(int, *tl);
 1000         if (len > NFS_MAXPATHLEN || len <= 0) {
 1001                 error = EBADRPC;
 1002                 goto nfsmout;
 1003         }
 1004         MALLOC(pathcp, caddr_t, len + 1, M_TEMP, M_WAITOK);
 1005         error = nfsrv_mtostr(nd, pathcp, len);
 1006         if (error)
 1007                 goto nfsmout;
 1008         if (nd->nd_flag & ND_NFSV2) {
 1009                 NFSM_DISSECT(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
 1010                 nvap->na_mode = fxdr_unsigned(u_int16_t, sp->sa_mode);
 1011         }
 1012         *pathcpp = pathcp;
 1013         *lenp = len;
 1014         NFSEXITCODE2(0, nd);
 1015         return (0);
 1016 nfsmout:
 1017         if (pathcp)
 1018                 free(pathcp, M_TEMP);
 1019         NFSEXITCODE2(error, nd);
 1020         return (error);
 1021 }
 1022 
 1023 /*
 1024  * Remove a non-directory object.
 1025  */
 1026 int
 1027 nfsvno_removesub(struct nameidata *ndp, int is_v4, struct ucred *cred,
 1028     struct thread *p, struct nfsexstuff *exp)
 1029 {
 1030         struct vnode *vp;
 1031         int error = 0;
 1032 
 1033         vp = ndp->ni_vp;
 1034         if (vp->v_type == VDIR)
 1035                 error = NFSERR_ISDIR;
 1036         else if (is_v4)
 1037                 error = nfsrv_checkremove(vp, 1, p);
 1038         if (!error)
 1039                 error = VOP_REMOVE(ndp->ni_dvp, vp, &ndp->ni_cnd);
 1040         if (ndp->ni_dvp == vp)
 1041                 vrele(ndp->ni_dvp);
 1042         else
 1043                 vput(ndp->ni_dvp);
 1044         vput(vp);
 1045         if ((ndp->ni_cnd.cn_flags & SAVENAME) != 0)
 1046                 nfsvno_relpathbuf(ndp);
 1047         NFSEXITCODE(error);
 1048         return (error);
 1049 }
 1050 
 1051 /*
 1052  * Remove a directory.
 1053  */
 1054 int
 1055 nfsvno_rmdirsub(struct nameidata *ndp, int is_v4, struct ucred *cred,
 1056     struct thread *p, struct nfsexstuff *exp)
 1057 {
 1058         struct vnode *vp;
 1059         int error = 0;
 1060 
 1061         vp = ndp->ni_vp;
 1062         if (vp->v_type != VDIR) {
 1063                 error = ENOTDIR;
 1064                 goto out;
 1065         }
 1066         /*
 1067          * No rmdir "." please.
 1068          */
 1069         if (ndp->ni_dvp == vp) {
 1070                 error = EINVAL;
 1071                 goto out;
 1072         }
 1073         /*
 1074          * The root of a mounted filesystem cannot be deleted.
 1075          */
 1076         if (vp->v_vflag & VV_ROOT)
 1077                 error = EBUSY;
 1078 out:
 1079         if (!error)
 1080                 error = VOP_RMDIR(ndp->ni_dvp, vp, &ndp->ni_cnd);
 1081         if (ndp->ni_dvp == vp)
 1082                 vrele(ndp->ni_dvp);
 1083         else
 1084                 vput(ndp->ni_dvp);
 1085         vput(vp);
 1086         if ((ndp->ni_cnd.cn_flags & SAVENAME) != 0)
 1087                 nfsvno_relpathbuf(ndp);
 1088         NFSEXITCODE(error);
 1089         return (error);
 1090 }
 1091 
 1092 /*
 1093  * Rename vnode op.
 1094  */
 1095 int
 1096 nfsvno_rename(struct nameidata *fromndp, struct nameidata *tondp,
 1097     u_int32_t ndstat, u_int32_t ndflag, struct ucred *cred, struct thread *p)
 1098 {
 1099         struct vnode *fvp, *tvp, *tdvp;
 1100         int error = 0;
 1101 
 1102         fvp = fromndp->ni_vp;
 1103         if (ndstat) {
 1104                 vrele(fromndp->ni_dvp);
 1105                 vrele(fvp);
 1106                 error = ndstat;
 1107                 goto out1;
 1108         }
 1109         tdvp = tondp->ni_dvp;
 1110         tvp = tondp->ni_vp;
 1111         if (tvp != NULL) {
 1112                 if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
 1113                         error = (ndflag & ND_NFSV2) ? EISDIR : EEXIST;
 1114                         goto out;
 1115                 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
 1116                         error = (ndflag & ND_NFSV2) ? ENOTDIR : EEXIST;
 1117                         goto out;
 1118                 }
 1119                 if (tvp->v_type == VDIR && tvp->v_mountedhere) {
 1120                         error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
 1121                         goto out;
 1122                 }
 1123 
 1124                 /*
 1125                  * A rename to '.' or '..' results in a prematurely
 1126                  * unlocked vnode on FreeBSD5, so I'm just going to fail that
 1127                  * here.
 1128                  */
 1129                 if ((tondp->ni_cnd.cn_namelen == 1 &&
 1130                      tondp->ni_cnd.cn_nameptr[0] == '.') ||
 1131                     (tondp->ni_cnd.cn_namelen == 2 &&
 1132                      tondp->ni_cnd.cn_nameptr[0] == '.' &&
 1133                      tondp->ni_cnd.cn_nameptr[1] == '.')) {
 1134                         error = EINVAL;
 1135                         goto out;
 1136                 }
 1137         }
 1138         if (fvp->v_type == VDIR && fvp->v_mountedhere) {
 1139                 error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
 1140                 goto out;
 1141         }
 1142         if (fvp->v_mount != tdvp->v_mount) {
 1143                 error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
 1144                 goto out;
 1145         }
 1146         if (fvp == tdvp) {
 1147                 error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EINVAL;
 1148                 goto out;
 1149         }
 1150         if (fvp == tvp) {
 1151                 /*
 1152                  * If source and destination are the same, there is nothing to
 1153                  * do. Set error to -1 to indicate this.
 1154                  */
 1155                 error = -1;
 1156                 goto out;
 1157         }
 1158         if (ndflag & ND_NFSV4) {
 1159                 if (NFSVOPLOCK(fvp, LK_EXCLUSIVE) == 0) {
 1160                         error = nfsrv_checkremove(fvp, 0, p);
 1161                         NFSVOPUNLOCK(fvp, 0);
 1162                 } else
 1163                         error = EPERM;
 1164                 if (tvp && !error)
 1165                         error = nfsrv_checkremove(tvp, 1, p);
 1166         } else {
 1167                 /*
 1168                  * For NFSv2 and NFSv3, try to get rid of the delegation, so
 1169                  * that the NFSv4 client won't be confused by the rename.
 1170                  * Since nfsd_recalldelegation() can only be called on an
 1171                  * unlocked vnode at this point and fvp is the file that will
 1172                  * still exist after the rename, just do fvp.
 1173                  */
 1174                 nfsd_recalldelegation(fvp, p);
 1175         }
 1176 out:
 1177         if (!error) {
 1178                 error = VOP_RENAME(fromndp->ni_dvp, fromndp->ni_vp,
 1179                     &fromndp->ni_cnd, tondp->ni_dvp, tondp->ni_vp,
 1180                     &tondp->ni_cnd);
 1181         } else {
 1182                 if (tdvp == tvp)
 1183                         vrele(tdvp);
 1184                 else
 1185                         vput(tdvp);
 1186                 if (tvp)
 1187                         vput(tvp);
 1188                 vrele(fromndp->ni_dvp);
 1189                 vrele(fvp);
 1190                 if (error == -1)
 1191                         error = 0;
 1192         }
 1193         vrele(tondp->ni_startdir);
 1194         nfsvno_relpathbuf(tondp);
 1195 out1:
 1196         vrele(fromndp->ni_startdir);
 1197         nfsvno_relpathbuf(fromndp);
 1198         NFSEXITCODE(error);
 1199         return (error);
 1200 }
 1201 
 1202 /*
 1203  * Link vnode op.
 1204  */
 1205 int
 1206 nfsvno_link(struct nameidata *ndp, struct vnode *vp, struct ucred *cred,
 1207     struct thread *p, struct nfsexstuff *exp)
 1208 {
 1209         struct vnode *xp;
 1210         int error = 0;
 1211 
 1212         xp = ndp->ni_vp;
 1213         if (xp != NULL) {
 1214                 error = EEXIST;
 1215         } else {
 1216                 xp = ndp->ni_dvp;
 1217                 if (vp->v_mount != xp->v_mount)
 1218                         error = EXDEV;
 1219         }
 1220         if (!error) {
 1221                 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
 1222                 if ((vp->v_iflag & VI_DOOMED) == 0)
 1223                         error = VOP_LINK(ndp->ni_dvp, vp, &ndp->ni_cnd);
 1224                 else
 1225                         error = EPERM;
 1226                 if (ndp->ni_dvp == vp)
 1227                         vrele(ndp->ni_dvp);
 1228                 else
 1229                         vput(ndp->ni_dvp);
 1230                 NFSVOPUNLOCK(vp, 0);
 1231         } else {
 1232                 if (ndp->ni_dvp == ndp->ni_vp)
 1233                         vrele(ndp->ni_dvp);
 1234                 else
 1235                         vput(ndp->ni_dvp);
 1236                 if (ndp->ni_vp)
 1237                         vrele(ndp->ni_vp);
 1238         }
 1239         nfsvno_relpathbuf(ndp);
 1240         NFSEXITCODE(error);
 1241         return (error);
 1242 }
 1243 
 1244 /*
 1245  * Do the fsync() appropriate for the commit.
 1246  */
 1247 int
 1248 nfsvno_fsync(struct vnode *vp, u_int64_t off, int cnt, struct ucred *cred,
 1249     struct thread *td)
 1250 {
 1251         int error = 0;
 1252 
 1253         /*
 1254          * RFC 1813 3.3.21: if count is 0, a flush from offset to the end of
 1255          * file is done.  At this time VOP_FSYNC does not accept offset and
 1256          * byte count parameters so call VOP_FSYNC the whole file for now.
 1257          * The same is true for NFSv4: RFC 3530 Sec. 14.2.3.
 1258          */
 1259         if (cnt == 0 || cnt > MAX_COMMIT_COUNT) {
 1260                 /*
 1261                  * Give up and do the whole thing
 1262                  */
 1263                 if (vp->v_object &&
 1264                    (vp->v_object->flags & OBJ_MIGHTBEDIRTY)) {
 1265                         VM_OBJECT_LOCK(vp->v_object);
 1266                         vm_object_page_clean(vp->v_object, 0, 0, OBJPC_SYNC);
 1267                         VM_OBJECT_UNLOCK(vp->v_object);
 1268                 }
 1269                 error = VOP_FSYNC(vp, MNT_WAIT, td);
 1270         } else {
 1271                 /*
 1272                  * Locate and synchronously write any buffers that fall
 1273                  * into the requested range.  Note:  we are assuming that
 1274                  * f_iosize is a power of 2.
 1275                  */
 1276                 int iosize = vp->v_mount->mnt_stat.f_iosize;
 1277                 int iomask = iosize - 1;
 1278                 struct bufobj *bo;
 1279                 daddr_t lblkno;
 1280 
 1281                 /*
 1282                  * Align to iosize boundry, super-align to page boundry.
 1283                  */
 1284                 if (off & iomask) {
 1285                         cnt += off & iomask;
 1286                         off &= ~(u_quad_t)iomask;
 1287                 }
 1288                 if (off & PAGE_MASK) {
 1289                         cnt += off & PAGE_MASK;
 1290                         off &= ~(u_quad_t)PAGE_MASK;
 1291                 }
 1292                 lblkno = off / iosize;
 1293 
 1294                 if (vp->v_object &&
 1295                    (vp->v_object->flags & OBJ_MIGHTBEDIRTY)) {
 1296                         VM_OBJECT_LOCK(vp->v_object);
 1297                         vm_object_page_clean(vp->v_object, OFF_TO_IDX(off),
 1298                             OFF_TO_IDX(off + cnt + PAGE_MASK), OBJPC_SYNC);
 1299                         VM_OBJECT_UNLOCK(vp->v_object);
 1300                 }
 1301 
 1302                 bo = &vp->v_bufobj;
 1303                 BO_LOCK(bo);
 1304                 while (cnt > 0) {
 1305                         struct buf *bp;
 1306 
 1307                         /*
 1308                          * If we have a buffer and it is marked B_DELWRI we
 1309                          * have to lock and write it.  Otherwise the prior
 1310                          * write is assumed to have already been committed.
 1311                          *
 1312                          * gbincore() can return invalid buffers now so we
 1313                          * have to check that bit as well (though B_DELWRI
 1314                          * should not be set if B_INVAL is set there could be
 1315                          * a race here since we haven't locked the buffer).
 1316                          */
 1317                         if ((bp = gbincore(&vp->v_bufobj, lblkno)) != NULL) {
 1318                                 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_SLEEPFAIL |
 1319                                     LK_INTERLOCK, BO_MTX(bo)) == ENOLCK) {
 1320                                         BO_LOCK(bo);
 1321                                         continue; /* retry */
 1322                                 }
 1323                                 if ((bp->b_flags & (B_DELWRI|B_INVAL)) ==
 1324                                     B_DELWRI) {
 1325                                         bremfree(bp);
 1326                                         bp->b_flags &= ~B_ASYNC;
 1327                                         bwrite(bp);
 1328                                         ++nfs_commit_miss;
 1329                                 } else
 1330                                         BUF_UNLOCK(bp);
 1331                                 BO_LOCK(bo);
 1332                         }
 1333                         ++nfs_commit_blks;
 1334                         if (cnt < iosize)
 1335                                 break;
 1336                         cnt -= iosize;
 1337                         ++lblkno;
 1338                 }
 1339                 BO_UNLOCK(bo);
 1340         }
 1341         NFSEXITCODE(error);
 1342         return (error);
 1343 }
 1344 
 1345 /*
 1346  * Statfs vnode op.
 1347  */
 1348 int
 1349 nfsvno_statfs(struct vnode *vp, struct statfs *sf)
 1350 {
 1351         int error;
 1352 
 1353         error = VFS_STATFS(vp->v_mount, sf);
 1354         if (error == 0) {
 1355                 /*
 1356                  * Since NFS handles these values as unsigned on the
 1357                  * wire, there is no way to represent negative values,
 1358                  * so set them to 0. Without this, they will appear
 1359                  * to be very large positive values for clients like
 1360                  * Solaris10.
 1361                  */
 1362                 if (sf->f_bavail < 0)
 1363                         sf->f_bavail = 0;
 1364                 if (sf->f_ffree < 0)
 1365                         sf->f_ffree = 0;
 1366         }
 1367         NFSEXITCODE(error);
 1368         return (error);
 1369 }
 1370 
 1371 /*
 1372  * Do the vnode op stuff for Open. Similar to nfsvno_createsub(), but
 1373  * must handle nfsrv_opencheck() calls after any other access checks.
 1374  */
 1375 void
 1376 nfsvno_open(struct nfsrv_descript *nd, struct nameidata *ndp,
 1377     nfsquad_t clientid, nfsv4stateid_t *stateidp, struct nfsstate *stp,
 1378     int *exclusive_flagp, struct nfsvattr *nvap, int32_t *cverf, int create,
 1379     NFSACL_T *aclp, nfsattrbit_t *attrbitp, struct ucred *cred, struct thread *p,
 1380     struct nfsexstuff *exp, struct vnode **vpp)
 1381 {
 1382         struct vnode *vp = NULL;
 1383         u_quad_t tempsize;
 1384         struct nfsexstuff nes;
 1385 
 1386         if (ndp->ni_vp == NULL)
 1387                 nd->nd_repstat = nfsrv_opencheck(clientid,
 1388                     stateidp, stp, NULL, nd, p, nd->nd_repstat);
 1389         if (!nd->nd_repstat) {
 1390                 if (ndp->ni_vp == NULL) {
 1391                         vrele(ndp->ni_startdir);
 1392                         nd->nd_repstat = VOP_CREATE(ndp->ni_dvp,
 1393                             &ndp->ni_vp, &ndp->ni_cnd, &nvap->na_vattr);
 1394                         vput(ndp->ni_dvp);
 1395                         nfsvno_relpathbuf(ndp);
 1396                         if (!nd->nd_repstat) {
 1397                                 if (*exclusive_flagp) {
 1398                                         *exclusive_flagp = 0;
 1399                                         NFSVNO_ATTRINIT(nvap);
 1400                                         nvap->na_atime.tv_sec = cverf[0];
 1401                                         nvap->na_atime.tv_nsec = cverf[1];
 1402                                         nd->nd_repstat = VOP_SETATTR(ndp->ni_vp,
 1403                                             &nvap->na_vattr, cred);
 1404                                 } else {
 1405                                         nfsrv_fixattr(nd, ndp->ni_vp, nvap,
 1406                                             aclp, p, attrbitp, exp);
 1407                                 }
 1408                         }
 1409                         vp = ndp->ni_vp;
 1410                 } else {
 1411                         if (ndp->ni_startdir)
 1412                                 vrele(ndp->ni_startdir);
 1413                         nfsvno_relpathbuf(ndp);
 1414                         vp = ndp->ni_vp;
 1415                         if (create == NFSV4OPEN_CREATE) {
 1416                                 if (ndp->ni_dvp == vp)
 1417                                         vrele(ndp->ni_dvp);
 1418                                 else
 1419                                         vput(ndp->ni_dvp);
 1420                         }
 1421                         if (NFSVNO_ISSETSIZE(nvap) && vp->v_type == VREG) {
 1422                                 if (ndp->ni_cnd.cn_flags & RDONLY)
 1423                                         NFSVNO_SETEXRDONLY(&nes);
 1424                                 else
 1425                                         NFSVNO_EXINIT(&nes);
 1426                                 nd->nd_repstat = nfsvno_accchk(vp, 
 1427                                     VWRITE, cred, &nes, p,
 1428                                     NFSACCCHK_NOOVERRIDE,
 1429                                     NFSACCCHK_VPISLOCKED, NULL);
 1430                                 nd->nd_repstat = nfsrv_opencheck(clientid,
 1431                                     stateidp, stp, vp, nd, p, nd->nd_repstat);
 1432                                 if (!nd->nd_repstat) {
 1433                                         tempsize = nvap->na_size;
 1434                                         NFSVNO_ATTRINIT(nvap);
 1435                                         nvap->na_size = tempsize;
 1436                                         nd->nd_repstat = VOP_SETATTR(vp,
 1437                                             &nvap->na_vattr, cred);
 1438                                 }
 1439                         } else if (vp->v_type == VREG) {
 1440                                 nd->nd_repstat = nfsrv_opencheck(clientid,
 1441                                     stateidp, stp, vp, nd, p, nd->nd_repstat);
 1442                         }
 1443                 }
 1444         } else {
 1445                 if (ndp->ni_cnd.cn_flags & HASBUF)
 1446                         nfsvno_relpathbuf(ndp);
 1447                 if (ndp->ni_startdir && create == NFSV4OPEN_CREATE) {
 1448                         vrele(ndp->ni_startdir);
 1449                         if (ndp->ni_dvp == ndp->ni_vp)
 1450                                 vrele(ndp->ni_dvp);
 1451                         else
 1452                                 vput(ndp->ni_dvp);
 1453                         if (ndp->ni_vp)
 1454                                 vput(ndp->ni_vp);
 1455                 }
 1456         }
 1457         *vpp = vp;
 1458 
 1459         NFSEXITCODE2(0, nd);
 1460 }
 1461 
 1462 /*
 1463  * Updates the file rev and sets the mtime and ctime
 1464  * to the current clock time, returning the va_filerev and va_Xtime
 1465  * values.
 1466  */
 1467 void
 1468 nfsvno_updfilerev(struct vnode *vp, struct nfsvattr *nvap,
 1469     struct ucred *cred, struct thread *p)
 1470 {
 1471         struct vattr va;
 1472 
 1473         VATTR_NULL(&va);
 1474         vfs_timestamp(&va.va_mtime);
 1475         (void) VOP_SETATTR(vp, &va, cred);
 1476         (void) nfsvno_getattr(vp, nvap, cred, p, 1);
 1477 }
 1478 
 1479 /*
 1480  * Glue routine to nfsv4_fillattr().
 1481  */
 1482 int
 1483 nfsvno_fillattr(struct nfsrv_descript *nd, struct mount *mp, struct vnode *vp,
 1484     struct nfsvattr *nvap, fhandle_t *fhp, int rderror, nfsattrbit_t *attrbitp,
 1485     struct ucred *cred, struct thread *p, int isdgram, int reterr,
 1486     int supports_nfsv4acls, int at_root, uint64_t mounted_on_fileno)
 1487 {
 1488         int error;
 1489 
 1490         error = nfsv4_fillattr(nd, mp, vp, NULL, &nvap->na_vattr, fhp, rderror,
 1491             attrbitp, cred, p, isdgram, reterr, supports_nfsv4acls, at_root,
 1492             mounted_on_fileno);
 1493         NFSEXITCODE2(0, nd);
 1494         return (error);
 1495 }
 1496 
 1497 /* Since the Readdir vnode ops vary, put the entire functions in here. */
 1498 /*
 1499  * nfs readdir service
 1500  * - mallocs what it thinks is enough to read
 1501  *      count rounded up to a multiple of DIRBLKSIZ <= NFS_MAXREADDIR
 1502  * - calls VOP_READDIR()
 1503  * - loops around building the reply
 1504  *      if the output generated exceeds count break out of loop
 1505  *      The NFSM_CLGET macro is used here so that the reply will be packed
 1506  *      tightly in mbuf clusters.
 1507  * - it trims out records with d_fileno == 0
 1508  *      this doesn't matter for Unix clients, but they might confuse clients
 1509  *      for other os'.
 1510  * - it trims out records with d_type == DT_WHT
 1511  *      these cannot be seen through NFS (unless we extend the protocol)
 1512  *     The alternate call nfsrvd_readdirplus() does lookups as well.
 1513  * PS: The NFS protocol spec. does not clarify what the "count" byte
 1514  *      argument is a count of.. just name strings and file id's or the
 1515  *      entire reply rpc or ...
 1516  *      I tried just file name and id sizes and it confused the Sun client,
 1517  *      so I am using the full rpc size now. The "paranoia.." comment refers
 1518  *      to including the status longwords that are not a part of the dir.
 1519  *      "entry" structures, but are in the rpc.
 1520  */
 1521 int
 1522 nfsrvd_readdir(struct nfsrv_descript *nd, int isdgram,
 1523     struct vnode *vp, struct thread *p, struct nfsexstuff *exp)
 1524 {
 1525         struct dirent *dp;
 1526         u_int32_t *tl;
 1527         int dirlen;
 1528         char *cpos, *cend, *rbuf;
 1529         struct nfsvattr at;
 1530         int nlen, error = 0, getret = 1;
 1531         int siz, cnt, fullsiz, eofflag, ncookies;
 1532         u_int64_t off, toff, verf;
 1533         u_long *cookies = NULL, *cookiep;
 1534         struct uio io;
 1535         struct iovec iv;
 1536         int not_zfs;
 1537 
 1538         if (nd->nd_repstat) {
 1539                 nfsrv_postopattr(nd, getret, &at);
 1540                 goto out;
 1541         }
 1542         if (nd->nd_flag & ND_NFSV2) {
 1543                 NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 1544                 off = fxdr_unsigned(u_quad_t, *tl++);
 1545         } else {
 1546                 NFSM_DISSECT(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
 1547                 off = fxdr_hyper(tl);
 1548                 tl += 2;
 1549                 verf = fxdr_hyper(tl);
 1550                 tl += 2;
 1551         }
 1552         toff = off;
 1553         cnt = fxdr_unsigned(int, *tl);
 1554         if (cnt > NFS_SRVMAXDATA(nd) || cnt < 0)
 1555                 cnt = NFS_SRVMAXDATA(nd);
 1556         siz = ((cnt + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1));
 1557         fullsiz = siz;
 1558         if (nd->nd_flag & ND_NFSV3) {
 1559                 nd->nd_repstat = getret = nfsvno_getattr(vp, &at, nd->nd_cred,
 1560                     p, 1);
 1561 #if 0
 1562                 /*
 1563                  * va_filerev is not sufficient as a cookie verifier,
 1564                  * since it is not supposed to change when entries are
 1565                  * removed/added unless that offset cookies returned to
 1566                  * the client are no longer valid.
 1567                  */
 1568                 if (!nd->nd_repstat && toff && verf != at.na_filerev)
 1569                         nd->nd_repstat = NFSERR_BAD_COOKIE;
 1570 #endif
 1571         }
 1572         if (!nd->nd_repstat && vp->v_type != VDIR)
 1573                 nd->nd_repstat = NFSERR_NOTDIR;
 1574         if (nd->nd_repstat == 0 && cnt == 0) {
 1575                 if (nd->nd_flag & ND_NFSV2)
 1576                         /* NFSv2 does not have NFSERR_TOOSMALL */
 1577                         nd->nd_repstat = EPERM;
 1578                 else
 1579                         nd->nd_repstat = NFSERR_TOOSMALL;
 1580         }
 1581         if (!nd->nd_repstat)
 1582                 nd->nd_repstat = nfsvno_accchk(vp, VEXEC,
 1583                     nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
 1584                     NFSACCCHK_VPISLOCKED, NULL);
 1585         if (nd->nd_repstat) {
 1586                 vput(vp);
 1587                 if (nd->nd_flag & ND_NFSV3)
 1588                         nfsrv_postopattr(nd, getret, &at);
 1589                 goto out;
 1590         }
 1591         not_zfs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "zfs");
 1592         MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
 1593 again:
 1594         eofflag = 0;
 1595         if (cookies) {
 1596                 free((caddr_t)cookies, M_TEMP);
 1597                 cookies = NULL;
 1598         }
 1599 
 1600         iv.iov_base = rbuf;
 1601         iv.iov_len = siz;
 1602         io.uio_iov = &iv;
 1603         io.uio_iovcnt = 1;
 1604         io.uio_offset = (off_t)off;
 1605         io.uio_resid = siz;
 1606         io.uio_segflg = UIO_SYSSPACE;
 1607         io.uio_rw = UIO_READ;
 1608         io.uio_td = NULL;
 1609         nd->nd_repstat = VOP_READDIR(vp, &io, nd->nd_cred, &eofflag, &ncookies,
 1610             &cookies);
 1611         off = (u_int64_t)io.uio_offset;
 1612         if (io.uio_resid)
 1613                 siz -= io.uio_resid;
 1614 
 1615         if (!cookies && !nd->nd_repstat)
 1616                 nd->nd_repstat = NFSERR_PERM;
 1617         if (nd->nd_flag & ND_NFSV3) {
 1618                 getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
 1619                 if (!nd->nd_repstat)
 1620                         nd->nd_repstat = getret;
 1621         }
 1622 
 1623         /*
 1624          * Handles the failed cases. nd->nd_repstat == 0 past here.
 1625          */
 1626         if (nd->nd_repstat) {
 1627                 vput(vp);
 1628                 free((caddr_t)rbuf, M_TEMP);
 1629                 if (cookies)
 1630                         free((caddr_t)cookies, M_TEMP);
 1631                 if (nd->nd_flag & ND_NFSV3)
 1632                         nfsrv_postopattr(nd, getret, &at);
 1633                 goto out;
 1634         }
 1635         /*
 1636          * If nothing read, return eof
 1637          * rpc reply
 1638          */
 1639         if (siz == 0) {
 1640                 vput(vp);
 1641                 if (nd->nd_flag & ND_NFSV2) {
 1642                         NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 1643                 } else {
 1644                         nfsrv_postopattr(nd, getret, &at);
 1645                         NFSM_BUILD(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
 1646                         txdr_hyper(at.na_filerev, tl);
 1647                         tl += 2;
 1648                 }
 1649                 *tl++ = newnfs_false;
 1650                 *tl = newnfs_true;
 1651                 FREE((caddr_t)rbuf, M_TEMP);
 1652                 FREE((caddr_t)cookies, M_TEMP);
 1653                 goto out;
 1654         }
 1655 
 1656         /*
 1657          * Check for degenerate cases of nothing useful read.
 1658          * If so go try again
 1659          */
 1660         cpos = rbuf;
 1661         cend = rbuf + siz;
 1662         dp = (struct dirent *)cpos;
 1663         cookiep = cookies;
 1664 
 1665         /*
 1666          * For some reason FreeBSD's ufs_readdir() chooses to back the
 1667          * directory offset up to a block boundary, so it is necessary to
 1668          * skip over the records that precede the requested offset. This
 1669          * requires the assumption that file offset cookies monotonically
 1670          * increase.
 1671          * Since the offset cookies don't monotonically increase for ZFS,
 1672          * this is not done when ZFS is the file system.
 1673          */
 1674         while (cpos < cend && ncookies > 0 &&
 1675             (dp->d_fileno == 0 || dp->d_type == DT_WHT ||
 1676              (not_zfs != 0 && ((u_quad_t)(*cookiep)) <= toff))) {
 1677                 cpos += dp->d_reclen;
 1678                 dp = (struct dirent *)cpos;
 1679                 cookiep++;
 1680                 ncookies--;
 1681         }
 1682         if (cpos >= cend || ncookies == 0) {
 1683                 siz = fullsiz;
 1684                 toff = off;
 1685                 goto again;
 1686         }
 1687         vput(vp);
 1688 
 1689         /*
 1690          * dirlen is the size of the reply, including all XDR and must
 1691          * not exceed cnt. For NFSv2, RFC1094 didn't clearly indicate
 1692          * if the XDR should be included in "count", but to be safe, we do.
 1693          * (Include the two booleans at the end of the reply in dirlen now.)
 1694          */
 1695         if (nd->nd_flag & ND_NFSV3) {
 1696                 nfsrv_postopattr(nd, getret, &at);
 1697                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 1698                 txdr_hyper(at.na_filerev, tl);
 1699                 dirlen = NFSX_V3POSTOPATTR + NFSX_VERF + 2 * NFSX_UNSIGNED;
 1700         } else {
 1701                 dirlen = 2 * NFSX_UNSIGNED;
 1702         }
 1703 
 1704         /* Loop through the records and build reply */
 1705         while (cpos < cend && ncookies > 0) {
 1706                 nlen = dp->d_namlen;
 1707                 if (dp->d_fileno != 0 && dp->d_type != DT_WHT &&
 1708                         nlen <= NFS_MAXNAMLEN) {
 1709                         if (nd->nd_flag & ND_NFSV3)
 1710                                 dirlen += (6*NFSX_UNSIGNED + NFSM_RNDUP(nlen));
 1711                         else
 1712                                 dirlen += (4*NFSX_UNSIGNED + NFSM_RNDUP(nlen));
 1713                         if (dirlen > cnt) {
 1714                                 eofflag = 0;
 1715                                 break;
 1716                         }
 1717 
 1718                         /*
 1719                          * Build the directory record xdr from
 1720                          * the dirent entry.
 1721                          */
 1722                         if (nd->nd_flag & ND_NFSV3) {
 1723                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
 1724                                 *tl++ = newnfs_true;
 1725                                 *tl++ = 0;
 1726                         } else {
 1727                                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 1728                                 *tl++ = newnfs_true;
 1729                         }
 1730                         *tl = txdr_unsigned(dp->d_fileno);
 1731                         (void) nfsm_strtom(nd, dp->d_name, nlen);
 1732                         if (nd->nd_flag & ND_NFSV3) {
 1733                                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 1734                                 *tl++ = 0;
 1735                         } else
 1736                                 NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
 1737                         *tl = txdr_unsigned(*cookiep);
 1738                 }
 1739                 cpos += dp->d_reclen;
 1740                 dp = (struct dirent *)cpos;
 1741                 cookiep++;
 1742                 ncookies--;
 1743         }
 1744         if (cpos < cend)
 1745                 eofflag = 0;
 1746         NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 1747         *tl++ = newnfs_false;
 1748         if (eofflag)
 1749                 *tl = newnfs_true;
 1750         else
 1751                 *tl = newnfs_false;
 1752         FREE((caddr_t)rbuf, M_TEMP);
 1753         FREE((caddr_t)cookies, M_TEMP);
 1754 
 1755 out:
 1756         NFSEXITCODE2(0, nd);
 1757         return (0);
 1758 nfsmout:
 1759         vput(vp);
 1760         NFSEXITCODE2(error, nd);
 1761         return (error);
 1762 }
 1763 
 1764 /*
 1765  * Readdirplus for V3 and Readdir for V4.
 1766  */
 1767 int
 1768 nfsrvd_readdirplus(struct nfsrv_descript *nd, int isdgram,
 1769     struct vnode *vp, struct thread *p, struct nfsexstuff *exp)
 1770 {
 1771         struct dirent *dp;
 1772         u_int32_t *tl;
 1773         int dirlen;
 1774         char *cpos, *cend, *rbuf;
 1775         struct vnode *nvp;
 1776         fhandle_t nfh;
 1777         struct nfsvattr nva, at, *nvap = &nva;
 1778         struct mbuf *mb0, *mb1;
 1779         struct nfsreferral *refp;
 1780         int nlen, r, error = 0, getret = 1, usevget = 1;
 1781         int siz, cnt, fullsiz, eofflag, ncookies, entrycnt;
 1782         caddr_t bpos0, bpos1;
 1783         u_int64_t off, toff, verf;
 1784         u_long *cookies = NULL, *cookiep;
 1785         nfsattrbit_t attrbits, rderrbits, savbits;
 1786         struct uio io;
 1787         struct iovec iv;
 1788         struct componentname cn;
 1789         int at_root, needs_unbusy, not_zfs, supports_nfsv4acls;
 1790         struct mount *mp, *new_mp;
 1791         uint64_t mounted_on_fileno;
 1792 
 1793         if (nd->nd_repstat) {
 1794                 nfsrv_postopattr(nd, getret, &at);
 1795                 goto out;
 1796         }
 1797         NFSM_DISSECT(tl, u_int32_t *, 6 * NFSX_UNSIGNED);
 1798         off = fxdr_hyper(tl);
 1799         toff = off;
 1800         tl += 2;
 1801         verf = fxdr_hyper(tl);
 1802         tl += 2;
 1803         siz = fxdr_unsigned(int, *tl++);
 1804         cnt = fxdr_unsigned(int, *tl);
 1805 
 1806         /*
 1807          * Use the server's maximum data transfer size as the upper bound
 1808          * on reply datalen.
 1809          */
 1810         if (cnt > NFS_SRVMAXDATA(nd) || cnt < 0)
 1811                 cnt = NFS_SRVMAXDATA(nd);
 1812 
 1813         /*
 1814          * siz is a "hint" of how much directory information (name, fileid,
 1815          * cookie) should be in the reply. At least one client "hints" 0,
 1816          * so I set it to cnt for that case. I also round it up to the
 1817          * next multiple of DIRBLKSIZ.
 1818          */
 1819         if (siz <= 0)
 1820                 siz = cnt;
 1821         siz = ((siz + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1));
 1822 
 1823         if (nd->nd_flag & ND_NFSV4) {
 1824                 error = nfsrv_getattrbits(nd, &attrbits, NULL, NULL);
 1825                 if (error)
 1826                         goto nfsmout;
 1827                 NFSSET_ATTRBIT(&savbits, &attrbits);
 1828                 NFSCLRNOTFILLABLE_ATTRBIT(&attrbits);
 1829                 NFSZERO_ATTRBIT(&rderrbits);
 1830                 NFSSETBIT_ATTRBIT(&rderrbits, NFSATTRBIT_RDATTRERROR);
 1831         } else {
 1832                 NFSZERO_ATTRBIT(&attrbits);
 1833         }
 1834         fullsiz = siz;
 1835         nd->nd_repstat = getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
 1836         if (!nd->nd_repstat) {
 1837             if (off && verf != at.na_filerev) {
 1838                 /*
 1839                  * va_filerev is not sufficient as a cookie verifier,
 1840                  * since it is not supposed to change when entries are
 1841                  * removed/added unless that offset cookies returned to
 1842                  * the client are no longer valid.
 1843                  */
 1844 #if 0
 1845                 if (nd->nd_flag & ND_NFSV4) {
 1846                         nd->nd_repstat = NFSERR_NOTSAME;
 1847                 } else {
 1848                         nd->nd_repstat = NFSERR_BAD_COOKIE;
 1849                 }
 1850 #endif
 1851             } else if ((nd->nd_flag & ND_NFSV4) && off == 0 && verf != 0) {
 1852                 nd->nd_repstat = NFSERR_BAD_COOKIE;
 1853             }
 1854         }
 1855         if (!nd->nd_repstat && vp->v_type != VDIR)
 1856                 nd->nd_repstat = NFSERR_NOTDIR;
 1857         if (!nd->nd_repstat && cnt == 0)
 1858                 nd->nd_repstat = NFSERR_TOOSMALL;
 1859         if (!nd->nd_repstat)
 1860                 nd->nd_repstat = nfsvno_accchk(vp, VEXEC,
 1861                     nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
 1862                     NFSACCCHK_VPISLOCKED, NULL);
 1863         if (nd->nd_repstat) {
 1864                 vput(vp);
 1865                 if (nd->nd_flag & ND_NFSV3)
 1866                         nfsrv_postopattr(nd, getret, &at);
 1867                 goto out;
 1868         }
 1869         not_zfs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "zfs");
 1870 
 1871         MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
 1872 again:
 1873         eofflag = 0;
 1874         if (cookies) {
 1875                 free((caddr_t)cookies, M_TEMP);
 1876                 cookies = NULL;
 1877         }
 1878 
 1879         iv.iov_base = rbuf;
 1880         iv.iov_len = siz;
 1881         io.uio_iov = &iv;
 1882         io.uio_iovcnt = 1;
 1883         io.uio_offset = (off_t)off;
 1884         io.uio_resid = siz;
 1885         io.uio_segflg = UIO_SYSSPACE;
 1886         io.uio_rw = UIO_READ;
 1887         io.uio_td = NULL;
 1888         nd->nd_repstat = VOP_READDIR(vp, &io, nd->nd_cred, &eofflag, &ncookies,
 1889             &cookies);
 1890         off = (u_int64_t)io.uio_offset;
 1891         if (io.uio_resid)
 1892                 siz -= io.uio_resid;
 1893 
 1894         getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
 1895 
 1896         if (!cookies && !nd->nd_repstat)
 1897                 nd->nd_repstat = NFSERR_PERM;
 1898         if (!nd->nd_repstat)
 1899                 nd->nd_repstat = getret;
 1900         if (nd->nd_repstat) {
 1901                 vput(vp);
 1902                 if (cookies)
 1903                         free((caddr_t)cookies, M_TEMP);
 1904                 free((caddr_t)rbuf, M_TEMP);
 1905                 if (nd->nd_flag & ND_NFSV3)
 1906                         nfsrv_postopattr(nd, getret, &at);
 1907                 goto out;
 1908         }
 1909         /*
 1910          * If nothing read, return eof
 1911          * rpc reply
 1912          */
 1913         if (siz == 0) {
 1914                 vput(vp);
 1915                 if (nd->nd_flag & ND_NFSV3)
 1916                         nfsrv_postopattr(nd, getret, &at);
 1917                 NFSM_BUILD(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
 1918                 txdr_hyper(at.na_filerev, tl);
 1919                 tl += 2;
 1920                 *tl++ = newnfs_false;
 1921                 *tl = newnfs_true;
 1922                 free((caddr_t)cookies, M_TEMP);
 1923                 free((caddr_t)rbuf, M_TEMP);
 1924                 goto out;
 1925         }
 1926 
 1927         /*
 1928          * Check for degenerate cases of nothing useful read.
 1929          * If so go try again
 1930          */
 1931         cpos = rbuf;
 1932         cend = rbuf + siz;
 1933         dp = (struct dirent *)cpos;
 1934         cookiep = cookies;
 1935 
 1936         /*
 1937          * For some reason FreeBSD's ufs_readdir() chooses to back the
 1938          * directory offset up to a block boundary, so it is necessary to
 1939          * skip over the records that precede the requested offset. This
 1940          * requires the assumption that file offset cookies monotonically
 1941          * increase.
 1942          * Since the offset cookies don't monotonically increase for ZFS,
 1943          * this is not done when ZFS is the file system.
 1944          */
 1945         while (cpos < cend && ncookies > 0 &&
 1946           (dp->d_fileno == 0 || dp->d_type == DT_WHT ||
 1947            (not_zfs != 0 && ((u_quad_t)(*cookiep)) <= toff) ||
 1948            ((nd->nd_flag & ND_NFSV4) &&
 1949             ((dp->d_namlen == 1 && dp->d_name[0] == '.') ||
 1950              (dp->d_namlen==2 && dp->d_name[0]=='.' && dp->d_name[1]=='.'))))) {
 1951                 cpos += dp->d_reclen;
 1952                 dp = (struct dirent *)cpos;
 1953                 cookiep++;
 1954                 ncookies--;
 1955         }
 1956         if (cpos >= cend || ncookies == 0) {
 1957                 siz = fullsiz;
 1958                 toff = off;
 1959                 goto again;
 1960         }
 1961 
 1962         /*
 1963          * Busy the file system so that the mount point won't go away
 1964          * and, as such, VFS_VGET() can be used safely.
 1965          */
 1966         mp = vp->v_mount;
 1967         vfs_ref(mp);
 1968         NFSVOPUNLOCK(vp, 0);
 1969         nd->nd_repstat = vfs_busy(mp, 0);
 1970         vfs_rel(mp);
 1971         if (nd->nd_repstat != 0) {
 1972                 vrele(vp);
 1973                 free(cookies, M_TEMP);
 1974                 free(rbuf, M_TEMP);
 1975                 if (nd->nd_flag & ND_NFSV3)
 1976                         nfsrv_postopattr(nd, getret, &at);
 1977                 goto out;
 1978         }
 1979 
 1980         /*
 1981          * Save this position, in case there is an error before one entry
 1982          * is created.
 1983          */
 1984         mb0 = nd->nd_mb;
 1985         bpos0 = nd->nd_bpos;
 1986 
 1987         /*
 1988          * Fill in the first part of the reply.
 1989          * dirlen is the reply length in bytes and cannot exceed cnt.
 1990          * (Include the two booleans at the end of the reply in dirlen now,
 1991          *  so we recognize when we have exceeded cnt.)
 1992          */
 1993         if (nd->nd_flag & ND_NFSV3) {
 1994                 dirlen = NFSX_V3POSTOPATTR + NFSX_VERF + 2 * NFSX_UNSIGNED;
 1995                 nfsrv_postopattr(nd, getret, &at);
 1996         } else {
 1997                 dirlen = NFSX_VERF + 2 * NFSX_UNSIGNED;
 1998         }
 1999         NFSM_BUILD(tl, u_int32_t *, NFSX_VERF);
 2000         txdr_hyper(at.na_filerev, tl);
 2001 
 2002         /*
 2003          * Save this position, in case there is an empty reply needed.
 2004          */
 2005         mb1 = nd->nd_mb;
 2006         bpos1 = nd->nd_bpos;
 2007 
 2008         /* Loop through the records and build reply */
 2009         entrycnt = 0;
 2010         while (cpos < cend && ncookies > 0 && dirlen < cnt) {
 2011                 nlen = dp->d_namlen;
 2012                 if (dp->d_fileno != 0 && dp->d_type != DT_WHT &&
 2013                     nlen <= NFS_MAXNAMLEN &&
 2014                     ((nd->nd_flag & ND_NFSV3) || nlen > 2 ||
 2015                      (nlen==2 && (dp->d_name[0]!='.' || dp->d_name[1]!='.'))
 2016                       || (nlen == 1 && dp->d_name[0] != '.'))) {
 2017                         /*
 2018                          * Save the current position in the reply, in case
 2019                          * this entry exceeds cnt.
 2020                          */
 2021                         mb1 = nd->nd_mb;
 2022                         bpos1 = nd->nd_bpos;
 2023         
 2024                         /*
 2025                          * For readdir_and_lookup get the vnode using
 2026                          * the file number.
 2027                          */
 2028                         nvp = NULL;
 2029                         refp = NULL;
 2030                         r = 0;
 2031                         at_root = 0;
 2032                         needs_unbusy = 0;
 2033                         new_mp = mp;
 2034                         mounted_on_fileno = (uint64_t)dp->d_fileno;
 2035                         if ((nd->nd_flag & ND_NFSV3) ||
 2036                             NFSNONZERO_ATTRBIT(&savbits)) {
 2037                                 if (nd->nd_flag & ND_NFSV4)
 2038                                         refp = nfsv4root_getreferral(NULL,
 2039                                             vp, dp->d_fileno);
 2040                                 if (refp == NULL) {
 2041                                         if (usevget)
 2042                                                 r = VFS_VGET(mp, dp->d_fileno,
 2043                                                     LK_SHARED, &nvp);
 2044                                         else
 2045                                                 r = EOPNOTSUPP;
 2046                                         if (r == EOPNOTSUPP) {
 2047                                                 if (usevget) {
 2048                                                         usevget = 0;
 2049                                                         cn.cn_nameiop = LOOKUP;
 2050                                                         cn.cn_lkflags =
 2051                                                             LK_SHARED |
 2052                                                             LK_RETRY;
 2053                                                         cn.cn_cred =
 2054                                                             nd->nd_cred;
 2055                                                         cn.cn_thread = p;
 2056                                                 }
 2057                                                 cn.cn_nameptr = dp->d_name;
 2058                                                 cn.cn_namelen = nlen;
 2059                                                 cn.cn_flags = ISLASTCN |
 2060                                                     NOFOLLOW | LOCKLEAF |
 2061                                                     MPSAFE;
 2062                                                 if (nlen == 2 &&
 2063                                                     dp->d_name[0] == '.' &&
 2064                                                     dp->d_name[1] == '.')
 2065                                                         cn.cn_flags |=
 2066                                                             ISDOTDOT;
 2067                                                 if (NFSVOPLOCK(vp, LK_SHARED)
 2068                                                     != 0) {
 2069                                                         nd->nd_repstat = EPERM;
 2070                                                         break;
 2071                                                 }
 2072                                                 if ((vp->v_vflag & VV_ROOT) != 0
 2073                                                     && (cn.cn_flags & ISDOTDOT)
 2074                                                     != 0) {
 2075                                                         vref(vp);
 2076                                                         nvp = vp;
 2077                                                         r = 0;
 2078                                                 } else {
 2079                                                         r = VOP_LOOKUP(vp, &nvp,
 2080                                                             &cn);
 2081                                                         if (vp != nvp)
 2082                                                                 NFSVOPUNLOCK(vp,
 2083                                                                     0);
 2084                                                 }
 2085                                         }
 2086 
 2087                                         /*
 2088                                          * For NFSv4, check to see if nvp is
 2089                                          * a mount point and get the mount
 2090                                          * point vnode, as required.
 2091                                          */
 2092                                         if (r == 0 &&
 2093                                             nfsrv_enable_crossmntpt != 0 &&
 2094                                             (nd->nd_flag & ND_NFSV4) != 0 &&
 2095                                             nvp->v_type == VDIR &&
 2096                                             nvp->v_mountedhere != NULL) {
 2097                                                 new_mp = nvp->v_mountedhere;
 2098                                                 r = vfs_busy(new_mp, 0);
 2099                                                 vput(nvp);
 2100                                                 nvp = NULL;
 2101                                                 if (r == 0) {
 2102                                                         r = VFS_ROOT(new_mp,
 2103                                                             LK_SHARED, &nvp);
 2104                                                         needs_unbusy = 1;
 2105                                                         if (r == 0)
 2106                                                                 at_root = 1;
 2107                                                 }
 2108                                         }
 2109                                 }
 2110                                 if (!r) {
 2111                                     if (refp == NULL &&
 2112                                         ((nd->nd_flag & ND_NFSV3) ||
 2113                                          NFSNONZERO_ATTRBIT(&attrbits))) {
 2114                                         r = nfsvno_getfh(nvp, &nfh, p);
 2115                                         if (!r)
 2116                                             r = nfsvno_getattr(nvp, nvap,
 2117                                                 nd->nd_cred, p, 1);
 2118                                     }
 2119                                 } else {
 2120                                     nvp = NULL;
 2121                                 }
 2122                                 if (r) {
 2123                                         if (!NFSISSET_ATTRBIT(&attrbits,
 2124                                             NFSATTRBIT_RDATTRERROR)) {
 2125                                                 if (nvp != NULL)
 2126                                                         vput(nvp);
 2127                                                 if (needs_unbusy != 0)
 2128                                                         vfs_unbusy(new_mp);
 2129                                                 nd->nd_repstat = r;
 2130                                                 break;
 2131                                         }
 2132                                 }
 2133                         }
 2134 
 2135                         /*
 2136                          * Build the directory record xdr
 2137                          */
 2138                         if (nd->nd_flag & ND_NFSV3) {
 2139                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
 2140                                 *tl++ = newnfs_true;
 2141                                 *tl++ = 0;
 2142                                 *tl = txdr_unsigned(dp->d_fileno);
 2143                                 dirlen += nfsm_strtom(nd, dp->d_name, nlen);
 2144                                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 2145                                 *tl++ = 0;
 2146                                 *tl = txdr_unsigned(*cookiep);
 2147                                 nfsrv_postopattr(nd, 0, nvap);
 2148                                 dirlen += nfsm_fhtom(nd,(u_int8_t *)&nfh,0,1);
 2149                                 dirlen += (5*NFSX_UNSIGNED+NFSX_V3POSTOPATTR);
 2150                                 if (nvp != NULL)
 2151                                         vput(nvp);
 2152                         } else {
 2153                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
 2154                                 *tl++ = newnfs_true;
 2155                                 *tl++ = 0;
 2156                                 *tl = txdr_unsigned(*cookiep);
 2157                                 dirlen += nfsm_strtom(nd, dp->d_name, nlen);
 2158                                 if (nvp != NULL) {
 2159                                         supports_nfsv4acls =
 2160                                             nfs_supportsnfsv4acls(nvp);
 2161                                         NFSVOPUNLOCK(nvp, 0);
 2162                                 } else
 2163                                         supports_nfsv4acls = 0;
 2164                                 if (refp != NULL) {
 2165                                         dirlen += nfsrv_putreferralattr(nd,
 2166                                             &savbits, refp, 0,
 2167                                             &nd->nd_repstat);
 2168                                         if (nd->nd_repstat) {
 2169                                                 if (nvp != NULL)
 2170                                                         vrele(nvp);
 2171                                                 if (needs_unbusy != 0)
 2172                                                         vfs_unbusy(new_mp);
 2173                                                 break;
 2174                                         }
 2175                                 } else if (r) {
 2176                                         dirlen += nfsvno_fillattr(nd, new_mp,
 2177                                             nvp, nvap, &nfh, r, &rderrbits,
 2178                                             nd->nd_cred, p, isdgram, 0,
 2179                                             supports_nfsv4acls, at_root,
 2180                                             mounted_on_fileno);
 2181                                 } else {
 2182                                         dirlen += nfsvno_fillattr(nd, new_mp,
 2183                                             nvp, nvap, &nfh, r, &attrbits,
 2184                                             nd->nd_cred, p, isdgram, 0,
 2185                                             supports_nfsv4acls, at_root,
 2186                                             mounted_on_fileno);
 2187                                 }
 2188                                 if (nvp != NULL)
 2189                                         vrele(nvp);
 2190                                 dirlen += (3 * NFSX_UNSIGNED);
 2191                         }
 2192                         if (needs_unbusy != 0)
 2193                                 vfs_unbusy(new_mp);
 2194                         if (dirlen <= cnt)
 2195                                 entrycnt++;
 2196                 }
 2197                 cpos += dp->d_reclen;
 2198                 dp = (struct dirent *)cpos;
 2199                 cookiep++;
 2200                 ncookies--;
 2201         }
 2202         vrele(vp);
 2203         vfs_unbusy(mp);
 2204 
 2205         /*
 2206          * If dirlen > cnt, we must strip off the last entry. If that
 2207          * results in an empty reply, report NFSERR_TOOSMALL.
 2208          */
 2209         if (dirlen > cnt || nd->nd_repstat) {
 2210                 if (!nd->nd_repstat && entrycnt == 0)
 2211                         nd->nd_repstat = NFSERR_TOOSMALL;
 2212                 if (nd->nd_repstat)
 2213                         newnfs_trimtrailing(nd, mb0, bpos0);
 2214                 else
 2215                         newnfs_trimtrailing(nd, mb1, bpos1);
 2216                 eofflag = 0;
 2217         } else if (cpos < cend)
 2218                 eofflag = 0;
 2219         if (!nd->nd_repstat) {
 2220                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 2221                 *tl++ = newnfs_false;
 2222                 if (eofflag)
 2223                         *tl = newnfs_true;
 2224                 else
 2225                         *tl = newnfs_false;
 2226         }
 2227         FREE((caddr_t)cookies, M_TEMP);
 2228         FREE((caddr_t)rbuf, M_TEMP);
 2229 
 2230 out:
 2231         NFSEXITCODE2(0, nd);
 2232         return (0);
 2233 nfsmout:
 2234         vput(vp);
 2235         NFSEXITCODE2(error, nd);
 2236         return (error);
 2237 }
 2238 
 2239 /*
 2240  * Get the settable attributes out of the mbuf list.
 2241  * (Return 0 or EBADRPC)
 2242  */
 2243 int
 2244 nfsrv_sattr(struct nfsrv_descript *nd, struct nfsvattr *nvap,
 2245     nfsattrbit_t *attrbitp, NFSACL_T *aclp, struct thread *p)
 2246 {
 2247         u_int32_t *tl;
 2248         struct nfsv2_sattr *sp;
 2249         int error = 0, toclient = 0;
 2250 
 2251         switch (nd->nd_flag & (ND_NFSV2 | ND_NFSV3 | ND_NFSV4)) {
 2252         case ND_NFSV2:
 2253                 NFSM_DISSECT(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
 2254                 /*
 2255                  * Some old clients didn't fill in the high order 16bits.
 2256                  * --> check the low order 2 bytes for 0xffff
 2257                  */
 2258                 if ((fxdr_unsigned(int, sp->sa_mode) & 0xffff) != 0xffff)
 2259                         nvap->na_mode = nfstov_mode(sp->sa_mode);
 2260                 if (sp->sa_uid != newnfs_xdrneg1)
 2261                         nvap->na_uid = fxdr_unsigned(uid_t, sp->sa_uid);
 2262                 if (sp->sa_gid != newnfs_xdrneg1)
 2263                         nvap->na_gid = fxdr_unsigned(gid_t, sp->sa_gid);
 2264                 if (sp->sa_size != newnfs_xdrneg1)
 2265                         nvap->na_size = fxdr_unsigned(u_quad_t, sp->sa_size);
 2266                 if (sp->sa_atime.nfsv2_sec != newnfs_xdrneg1) {
 2267 #ifdef notyet
 2268                         fxdr_nfsv2time(&sp->sa_atime, &nvap->na_atime);
 2269 #else
 2270                         nvap->na_atime.tv_sec =
 2271                                 fxdr_unsigned(u_int32_t,sp->sa_atime.nfsv2_sec);
 2272                         nvap->na_atime.tv_nsec = 0;
 2273 #endif
 2274                 }
 2275                 if (sp->sa_mtime.nfsv2_sec != newnfs_xdrneg1)
 2276                         fxdr_nfsv2time(&sp->sa_mtime, &nvap->na_mtime);
 2277                 break;
 2278         case ND_NFSV3:
 2279                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2280                 if (*tl == newnfs_true) {
 2281                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2282                         nvap->na_mode = nfstov_mode(*tl);
 2283                 }
 2284                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2285                 if (*tl == newnfs_true) {
 2286                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2287                         nvap->na_uid = fxdr_unsigned(uid_t, *tl);
 2288                 }
 2289                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2290                 if (*tl == newnfs_true) {
 2291                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2292                         nvap->na_gid = fxdr_unsigned(gid_t, *tl);
 2293                 }
 2294                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2295                 if (*tl == newnfs_true) {
 2296                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 2297                         nvap->na_size = fxdr_hyper(tl);
 2298                 }
 2299                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2300                 switch (fxdr_unsigned(int, *tl)) {
 2301                 case NFSV3SATTRTIME_TOCLIENT:
 2302                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 2303                         fxdr_nfsv3time(tl, &nvap->na_atime);
 2304                         toclient = 1;
 2305                         break;
 2306                 case NFSV3SATTRTIME_TOSERVER:
 2307                         vfs_timestamp(&nvap->na_atime);
 2308                         nvap->na_vaflags |= VA_UTIMES_NULL;
 2309                         break;
 2310                 };
 2311                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2312                 switch (fxdr_unsigned(int, *tl)) {
 2313                 case NFSV3SATTRTIME_TOCLIENT:
 2314                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 2315                         fxdr_nfsv3time(tl, &nvap->na_mtime);
 2316                         nvap->na_vaflags &= ~VA_UTIMES_NULL;
 2317                         break;
 2318                 case NFSV3SATTRTIME_TOSERVER:
 2319                         vfs_timestamp(&nvap->na_mtime);
 2320                         if (!toclient)
 2321                                 nvap->na_vaflags |= VA_UTIMES_NULL;
 2322                         break;
 2323                 };
 2324                 break;
 2325         case ND_NFSV4:
 2326                 error = nfsv4_sattr(nd, nvap, attrbitp, aclp, p);
 2327         };
 2328 nfsmout:
 2329         NFSEXITCODE2(error, nd);
 2330         return (error);
 2331 }
 2332 
 2333 /*
 2334  * Handle the setable attributes for V4.
 2335  * Returns NFSERR_BADXDR if it can't be parsed, 0 otherwise.
 2336  */
 2337 int
 2338 nfsv4_sattr(struct nfsrv_descript *nd, struct nfsvattr *nvap,
 2339     nfsattrbit_t *attrbitp, NFSACL_T *aclp, struct thread *p)
 2340 {
 2341         u_int32_t *tl;
 2342         int attrsum = 0;
 2343         int i, j;
 2344         int error, attrsize, bitpos, aclsize, aceerr, retnotsup = 0;
 2345         int toclient = 0;
 2346         u_char *cp, namestr[NFSV4_SMALLSTR + 1];
 2347         uid_t uid;
 2348         gid_t gid;
 2349 
 2350         error = nfsrv_getattrbits(nd, attrbitp, NULL, &retnotsup);
 2351         if (error)
 2352                 goto nfsmout;
 2353         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2354         attrsize = fxdr_unsigned(int, *tl);
 2355 
 2356         /*
 2357          * Loop around getting the setable attributes. If an unsupported
 2358          * one is found, set nd_repstat == NFSERR_ATTRNOTSUPP and return.
 2359          */
 2360         if (retnotsup) {
 2361                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
 2362                 bitpos = NFSATTRBIT_MAX;
 2363         } else {
 2364                 bitpos = 0;
 2365         }
 2366         for (; bitpos < NFSATTRBIT_MAX; bitpos++) {
 2367             if (attrsum > attrsize) {
 2368                 error = NFSERR_BADXDR;
 2369                 goto nfsmout;
 2370             }
 2371             if (NFSISSET_ATTRBIT(attrbitp, bitpos))
 2372                 switch (bitpos) {
 2373                 case NFSATTRBIT_SIZE:
 2374                         NFSM_DISSECT(tl, u_int32_t *, NFSX_HYPER);
 2375                         nvap->na_size = fxdr_hyper(tl);
 2376                         attrsum += NFSX_HYPER;
 2377                         break;
 2378                 case NFSATTRBIT_ACL:
 2379                         error = nfsrv_dissectacl(nd, aclp, &aceerr, &aclsize,
 2380                             p);
 2381                         if (error)
 2382                                 goto nfsmout;
 2383                         if (aceerr && !nd->nd_repstat)
 2384                                 nd->nd_repstat = aceerr;
 2385                         attrsum += aclsize;
 2386                         break;
 2387                 case NFSATTRBIT_ARCHIVE:
 2388                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2389                         if (!nd->nd_repstat)
 2390                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
 2391                         attrsum += NFSX_UNSIGNED;
 2392                         break;
 2393                 case NFSATTRBIT_HIDDEN:
 2394                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2395                         if (!nd->nd_repstat)
 2396                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
 2397                         attrsum += NFSX_UNSIGNED;
 2398                         break;
 2399                 case NFSATTRBIT_MIMETYPE:
 2400                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2401                         i = fxdr_unsigned(int, *tl);
 2402                         error = nfsm_advance(nd, NFSM_RNDUP(i), -1);
 2403                         if (error)
 2404                                 goto nfsmout;
 2405                         if (!nd->nd_repstat)
 2406                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
 2407                         attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(i));
 2408                         break;
 2409                 case NFSATTRBIT_MODE:
 2410                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2411                         nvap->na_mode = nfstov_mode(*tl);
 2412                         attrsum += NFSX_UNSIGNED;
 2413                         break;
 2414                 case NFSATTRBIT_OWNER:
 2415                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2416                         j = fxdr_unsigned(int, *tl);
 2417                         if (j < 0) {
 2418                                 error = NFSERR_BADXDR;
 2419                                 goto nfsmout;
 2420                         }
 2421                         if (j > NFSV4_SMALLSTR)
 2422                                 cp = malloc(j + 1, M_NFSSTRING, M_WAITOK);
 2423                         else
 2424                                 cp = namestr;
 2425                         error = nfsrv_mtostr(nd, cp, j);
 2426                         if (error) {
 2427                                 if (j > NFSV4_SMALLSTR)
 2428                                         free(cp, M_NFSSTRING);
 2429                                 goto nfsmout;
 2430                         }
 2431                         if (!nd->nd_repstat) {
 2432                                 nd->nd_repstat = nfsv4_strtouid(nd, cp, j, &uid,
 2433                                     p);
 2434                                 if (!nd->nd_repstat)
 2435                                         nvap->na_uid = uid;
 2436                         }
 2437                         if (j > NFSV4_SMALLSTR)
 2438                                 free(cp, M_NFSSTRING);
 2439                         attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(j));
 2440                         break;
 2441                 case NFSATTRBIT_OWNERGROUP:
 2442                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2443                         j = fxdr_unsigned(int, *tl);
 2444                         if (j < 0) {
 2445                                 error = NFSERR_BADXDR;
 2446                                 goto nfsmout;
 2447                         }
 2448                         if (j > NFSV4_SMALLSTR)
 2449                                 cp = malloc(j + 1, M_NFSSTRING, M_WAITOK);
 2450                         else
 2451                                 cp = namestr;
 2452                         error = nfsrv_mtostr(nd, cp, j);
 2453                         if (error) {
 2454                                 if (j > NFSV4_SMALLSTR)
 2455                                         free(cp, M_NFSSTRING);
 2456                                 goto nfsmout;
 2457                         }
 2458                         if (!nd->nd_repstat) {
 2459                                 nd->nd_repstat = nfsv4_strtogid(nd, cp, j, &gid,
 2460                                     p);
 2461                                 if (!nd->nd_repstat)
 2462                                         nvap->na_gid = gid;
 2463                         }
 2464                         if (j > NFSV4_SMALLSTR)
 2465                                 free(cp, M_NFSSTRING);
 2466                         attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(j));
 2467                         break;
 2468                 case NFSATTRBIT_SYSTEM:
 2469                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2470                         if (!nd->nd_repstat)
 2471                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
 2472                         attrsum += NFSX_UNSIGNED;
 2473                         break;
 2474                 case NFSATTRBIT_TIMEACCESSSET:
 2475                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2476                         attrsum += NFSX_UNSIGNED;
 2477                         if (fxdr_unsigned(int, *tl)==NFSV4SATTRTIME_TOCLIENT) {
 2478                             NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
 2479                             fxdr_nfsv4time(tl, &nvap->na_atime);
 2480                             toclient = 1;
 2481                             attrsum += NFSX_V4TIME;
 2482                         } else {
 2483                             vfs_timestamp(&nvap->na_atime);
 2484                             nvap->na_vaflags |= VA_UTIMES_NULL;
 2485                         }
 2486                         break;
 2487                 case NFSATTRBIT_TIMEBACKUP:
 2488                         NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
 2489                         if (!nd->nd_repstat)
 2490                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
 2491                         attrsum += NFSX_V4TIME;
 2492                         break;
 2493                 case NFSATTRBIT_TIMECREATE:
 2494                         NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
 2495                         if (!nd->nd_repstat)
 2496                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
 2497                         attrsum += NFSX_V4TIME;
 2498                         break;
 2499                 case NFSATTRBIT_TIMEMODIFYSET:
 2500                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2501                         attrsum += NFSX_UNSIGNED;
 2502                         if (fxdr_unsigned(int, *tl)==NFSV4SATTRTIME_TOCLIENT) {
 2503                             NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
 2504                             fxdr_nfsv4time(tl, &nvap->na_mtime);
 2505                             nvap->na_vaflags &= ~VA_UTIMES_NULL;
 2506                             attrsum += NFSX_V4TIME;
 2507                         } else {
 2508                             vfs_timestamp(&nvap->na_mtime);
 2509                             if (!toclient)
 2510                                 nvap->na_vaflags |= VA_UTIMES_NULL;
 2511                         }
 2512                         break;
 2513                 default:
 2514                         nd->nd_repstat = NFSERR_ATTRNOTSUPP;
 2515                         /*
 2516                          * set bitpos so we drop out of the loop.
 2517                          */
 2518                         bitpos = NFSATTRBIT_MAX;
 2519                         break;
 2520                 };
 2521         }
 2522 
 2523         /*
 2524          * some clients pad the attrlist, so we need to skip over the
 2525          * padding.
 2526          */
 2527         if (attrsum > attrsize) {
 2528                 error = NFSERR_BADXDR;
 2529         } else {
 2530                 attrsize = NFSM_RNDUP(attrsize);
 2531                 if (attrsum < attrsize)
 2532                         error = nfsm_advance(nd, attrsize - attrsum, -1);
 2533         }
 2534 nfsmout:
 2535         NFSEXITCODE2(error, nd);
 2536         return (error);
 2537 }
 2538 
 2539 /*
 2540  * Check/setup export credentials.
 2541  */
 2542 int
 2543 nfsd_excred(struct nfsrv_descript *nd, struct nfsexstuff *exp,
 2544     struct ucred *credanon)
 2545 {
 2546         int error = 0;
 2547 
 2548         /*
 2549          * Check/setup credentials.
 2550          */
 2551         if (nd->nd_flag & ND_GSS)
 2552                 exp->nes_exflag &= ~MNT_EXPORTANON;
 2553 
 2554         /*
 2555          * Check to see if the operation is allowed for this security flavor.
 2556          * RFC2623 suggests that the NFSv3 Fsinfo RPC be allowed to
 2557          * AUTH_NONE or AUTH_SYS for file systems requiring RPCSEC_GSS.
 2558          * Also, allow Secinfo, so that it can acquire the correct flavor(s).
 2559          */
 2560         if (nfsvno_testexp(nd, exp) &&
 2561             nd->nd_procnum != NFSV4OP_SECINFO &&
 2562             nd->nd_procnum != NFSPROC_FSINFO) {
 2563                 if (nd->nd_flag & ND_NFSV4)
 2564                         error = NFSERR_WRONGSEC;
 2565                 else
 2566                         error = (NFSERR_AUTHERR | AUTH_TOOWEAK);
 2567                 goto out;
 2568         }
 2569 
 2570         /*
 2571          * Check to see if the file system is exported V4 only.
 2572          */
 2573         if (NFSVNO_EXV4ONLY(exp) && !(nd->nd_flag & ND_NFSV4)) {
 2574                 error = NFSERR_PROGNOTV4;
 2575                 goto out;
 2576         }
 2577 
 2578         /*
 2579          * Now, map the user credentials.
 2580          * (Note that ND_AUTHNONE will only be set for an NFSv3
 2581          *  Fsinfo RPC. If set for anything else, this code might need
 2582          *  to change.)
 2583          */
 2584         if (NFSVNO_EXPORTED(exp) &&
 2585             ((!(nd->nd_flag & ND_GSS) && nd->nd_cred->cr_uid == 0) ||
 2586              NFSVNO_EXPORTANON(exp) ||
 2587              (nd->nd_flag & ND_AUTHNONE))) {
 2588                 nd->nd_cred->cr_uid = credanon->cr_uid;
 2589                 nd->nd_cred->cr_gid = credanon->cr_gid;
 2590                 crsetgroups(nd->nd_cred, credanon->cr_ngroups,
 2591                     credanon->cr_groups);
 2592         }
 2593 
 2594 out:
 2595         NFSEXITCODE2(error, nd);
 2596         return (error);
 2597 }
 2598 
 2599 /*
 2600  * Check exports.
 2601  */
 2602 int
 2603 nfsvno_checkexp(struct mount *mp, struct sockaddr *nam, struct nfsexstuff *exp,
 2604     struct ucred **credp)
 2605 {
 2606         int i, error, *secflavors;
 2607 
 2608         error = VFS_CHECKEXP(mp, nam, &exp->nes_exflag, credp,
 2609             &exp->nes_numsecflavor, &secflavors);
 2610         if (error) {
 2611                 if (nfs_rootfhset) {
 2612                         exp->nes_exflag = 0;
 2613                         exp->nes_numsecflavor = 0;
 2614                         error = 0;
 2615                 }
 2616         } else {
 2617                 /* Copy the security flavors. */
 2618                 for (i = 0; i < exp->nes_numsecflavor; i++)
 2619                         exp->nes_secflavors[i] = secflavors[i];
 2620         }
 2621         NFSEXITCODE(error);
 2622         return (error);
 2623 }
 2624 
 2625 /*
 2626  * Get a vnode for a file handle and export stuff.
 2627  */
 2628 int
 2629 nfsvno_fhtovp(struct mount *mp, fhandle_t *fhp, struct sockaddr *nam,
 2630     int lktype, struct vnode **vpp, struct nfsexstuff *exp,
 2631     struct ucred **credp)
 2632 {
 2633         int i, error, *secflavors;
 2634 
 2635         *credp = NULL;
 2636         exp->nes_numsecflavor = 0;
 2637         if (VFS_NEEDSGIANT(mp))
 2638                 error = ESTALE;
 2639         else
 2640                 error = VFS_FHTOVP(mp, &fhp->fh_fid, vpp);
 2641         if (error != 0)
 2642                 /* Make sure the server replies ESTALE to the client. */
 2643                 error = ESTALE;
 2644         if (nam && !error) {
 2645                 error = VFS_CHECKEXP(mp, nam, &exp->nes_exflag, credp,
 2646                     &exp->nes_numsecflavor, &secflavors);
 2647                 if (error) {
 2648                         if (nfs_rootfhset) {
 2649                                 exp->nes_exflag = 0;
 2650                                 exp->nes_numsecflavor = 0;
 2651                                 error = 0;
 2652                         } else {
 2653                                 vput(*vpp);
 2654                         }
 2655                 } else {
 2656                         /* Copy the security flavors. */
 2657                         for (i = 0; i < exp->nes_numsecflavor; i++)
 2658                                 exp->nes_secflavors[i] = secflavors[i];
 2659                 }
 2660         }
 2661         if (error == 0 && lktype == LK_SHARED)
 2662                 /*
 2663                  * It would be much better to pass lktype to VFS_FHTOVP(),
 2664                  * but this will have to do until VFS_FHTOVP() has a lock
 2665                  * type argument like VFS_VGET().
 2666                  */
 2667                 NFSVOPLOCK(*vpp, LK_DOWNGRADE | LK_RETRY);
 2668 
 2669         NFSEXITCODE(error);
 2670         return (error);
 2671 }
 2672 
 2673 /*
 2674  * nfsd_fhtovp() - convert a fh to a vnode ptr
 2675  *      - look up fsid in mount list (if not found ret error)
 2676  *      - get vp and export rights by calling nfsvno_fhtovp()
 2677  *      - if cred->cr_uid == 0 or MNT_EXPORTANON set it to credanon
 2678  *        for AUTH_SYS
 2679  *      - if mpp != NULL, return the mount point so that it can
 2680  *        be used for vn_finished_write() by the caller
 2681  */
 2682 void
 2683 nfsd_fhtovp(struct nfsrv_descript *nd, struct nfsrvfh *nfp, int lktype,
 2684     struct vnode **vpp, struct nfsexstuff *exp,
 2685     struct mount **mpp, int startwrite, struct thread *p)
 2686 {
 2687         struct mount *mp;
 2688         struct ucred *credanon;
 2689         fhandle_t *fhp;
 2690 
 2691         fhp = (fhandle_t *)nfp->nfsrvfh_data;
 2692         /*
 2693          * Check for the special case of the nfsv4root_fh.
 2694          */
 2695         mp = vfs_busyfs(&fhp->fh_fsid);
 2696         if (mpp != NULL)
 2697                 *mpp = mp;
 2698         if (mp == NULL) {
 2699                 *vpp = NULL;
 2700                 nd->nd_repstat = ESTALE;
 2701                 goto out;
 2702         }
 2703 
 2704         if (startwrite)
 2705                 vn_start_write(NULL, mpp, V_WAIT);
 2706 
 2707         nd->nd_repstat = nfsvno_fhtovp(mp, fhp, nd->nd_nam, lktype, vpp, exp,
 2708             &credanon);
 2709         vfs_unbusy(mp);
 2710 
 2711         /*
 2712          * For NFSv4 without a pseudo root fs, unexported file handles
 2713          * can be returned, so that Lookup works everywhere.
 2714          */
 2715         if (!nd->nd_repstat && exp->nes_exflag == 0 &&
 2716             !(nd->nd_flag & ND_NFSV4)) {
 2717                 vput(*vpp);
 2718                 nd->nd_repstat = EACCES;
 2719         }
 2720 
 2721         /*
 2722          * Personally, I've never seen any point in requiring a
 2723          * reserved port#, since only in the rare case where the
 2724          * clients are all boxes with secure system priviledges,
 2725          * does it provide any enhanced security, but... some people
 2726          * believe it to be useful and keep putting this code back in.
 2727          * (There is also some "security checker" out there that
 2728          *  complains if the nfs server doesn't enforce this.)
 2729          * However, note the following:
 2730          * RFC3530 (NFSv4) specifies that a reserved port# not be
 2731          *      required.
 2732          * RFC2623 recommends that, if a reserved port# is checked for,
 2733          *      that there be a way to turn that off--> ifdef'd.
 2734          */
 2735 #ifdef NFS_REQRSVPORT
 2736         if (!nd->nd_repstat) {
 2737                 struct sockaddr_in *saddr;
 2738                 struct sockaddr_in6 *saddr6;
 2739 
 2740                 saddr = NFSSOCKADDR(nd->nd_nam, struct sockaddr_in *);
 2741                 saddr6 = NFSSOCKADDR(nd->nd_nam, struct sockaddr_in6 *);
 2742                 if (!(nd->nd_flag & ND_NFSV4) &&
 2743                     ((saddr->sin_family == AF_INET &&
 2744                       ntohs(saddr->sin_port) >= IPPORT_RESERVED) ||
 2745                      (saddr6->sin6_family == AF_INET6 &&
 2746                       ntohs(saddr6->sin6_port) >= IPPORT_RESERVED))) {
 2747                         vput(*vpp);
 2748                         nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
 2749                 }
 2750         }
 2751 #endif  /* NFS_REQRSVPORT */
 2752 
 2753         /*
 2754          * Check/setup credentials.
 2755          */
 2756         if (!nd->nd_repstat) {
 2757                 nd->nd_saveduid = nd->nd_cred->cr_uid;
 2758                 nd->nd_repstat = nfsd_excred(nd, exp, credanon);
 2759                 if (nd->nd_repstat)
 2760                         vput(*vpp);
 2761         }
 2762         if (credanon != NULL)
 2763                 crfree(credanon);
 2764         if (nd->nd_repstat) {
 2765                 if (startwrite)
 2766                         vn_finished_write(mp);
 2767                 *vpp = NULL;
 2768                 if (mpp != NULL)
 2769                         *mpp = NULL;
 2770         }
 2771 
 2772 out:
 2773         NFSEXITCODE2(0, nd);
 2774 }
 2775 
 2776 /*
 2777  * glue for fp.
 2778  */
 2779 int
 2780 fp_getfvp(struct thread *p, int fd, struct file **fpp, struct vnode **vpp)
 2781 {
 2782         struct filedesc *fdp;
 2783         struct file *fp;
 2784         int error = 0;
 2785 
 2786         fdp = p->td_proc->p_fd;
 2787         if (fd >= fdp->fd_nfiles ||
 2788             (fp = fdp->fd_ofiles[fd]) == NULL) {
 2789                 error = EBADF;
 2790                 goto out;
 2791         }
 2792         *fpp = fp;
 2793 
 2794 out:
 2795         NFSEXITCODE(error);
 2796         return (error);
 2797 }
 2798 
 2799 /*
 2800  * Called from nfssvc() to update the exports list. Just call
 2801  * vfs_export(). This has to be done, since the v4 root fake fs isn't
 2802  * in the mount list.
 2803  */
 2804 int
 2805 nfsrv_v4rootexport(void *argp, struct ucred *cred, struct thread *p)
 2806 {
 2807         struct nfsex_args *nfsexargp = (struct nfsex_args *)argp;
 2808         int error = 0;
 2809         struct nameidata nd;
 2810         fhandle_t fh;
 2811 
 2812         error = vfs_export(&nfsv4root_mnt, &nfsexargp->export);
 2813         if ((nfsexargp->export.ex_flags & MNT_DELEXPORT) != 0)
 2814                 nfs_rootfhset = 0;
 2815         else if (error == 0) {
 2816                 if (nfsexargp->fspec == NULL) {
 2817                         error = EPERM;
 2818                         goto out;
 2819                 }
 2820                 /*
 2821                  * If fspec != NULL, this is the v4root path.
 2822                  */
 2823                 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE, UIO_USERSPACE,
 2824                     nfsexargp->fspec, p);
 2825                 if ((error = namei(&nd)) != 0)
 2826                         goto out;
 2827                 error = nfsvno_getfh(nd.ni_vp, &fh, p);
 2828                 vrele(nd.ni_vp);
 2829                 if (!error) {
 2830                         nfs_rootfh.nfsrvfh_len = NFSX_MYFH;
 2831                         NFSBCOPY((caddr_t)&fh,
 2832                             nfs_rootfh.nfsrvfh_data,
 2833                             sizeof (fhandle_t));
 2834                         nfs_rootfhset = 1;
 2835                 }
 2836         }
 2837 
 2838 out:
 2839         NFSEXITCODE(error);
 2840         return (error);
 2841 }
 2842 
 2843 /*
 2844  * Get the tcp socket sequence numbers we need.
 2845  * (Maybe this should be moved to the tcp sources?)
 2846  */
 2847 int
 2848 nfsrv_getsocksndseq(struct socket *so, tcp_seq *maxp, tcp_seq *unap)
 2849 {
 2850         struct inpcb *inp;
 2851         struct tcpcb *tp;
 2852         int error = 0;
 2853 
 2854         inp = sotoinpcb(so);
 2855         KASSERT(inp != NULL, ("nfsrv_getsocksndseq: inp == NULL"));
 2856         INP_RLOCK(inp);
 2857         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 2858                 INP_RUNLOCK(inp);
 2859                 error = EPIPE;
 2860                 goto out;
 2861         }
 2862         tp = intotcpcb(inp);
 2863         if (tp->t_state != TCPS_ESTABLISHED) {
 2864                 INP_RUNLOCK(inp);
 2865                 error = EPIPE;
 2866                 goto out;
 2867         }
 2868         *maxp = tp->snd_max;
 2869         *unap = tp->snd_una;
 2870         INP_RUNLOCK(inp);
 2871 
 2872 out:
 2873         NFSEXITCODE(error);
 2874         return (error);
 2875 }
 2876 
 2877 /*
 2878  * This function needs to test to see if the system is near its limit
 2879  * for memory allocation via malloc() or mget() and return True iff
 2880  * either of these resources are near their limit.
 2881  * XXX (For now, this is just a stub.)
 2882  */
 2883 int nfsrv_testmalloclimit = 0;
 2884 int
 2885 nfsrv_mallocmget_limit(void)
 2886 {
 2887         static int printmesg = 0;
 2888         static int testval = 1;
 2889 
 2890         if (nfsrv_testmalloclimit && (testval++ % 1000) == 0) {
 2891                 if ((printmesg++ % 100) == 0)
 2892                         printf("nfsd: malloc/mget near limit\n");
 2893                 return (1);
 2894         }
 2895         return (0);
 2896 }
 2897 
 2898 /*
 2899  * BSD specific initialization of a mount point.
 2900  */
 2901 void
 2902 nfsd_mntinit(void)
 2903 {
 2904         static int inited = 0;
 2905 
 2906         if (inited)
 2907                 return;
 2908         inited = 1;
 2909         nfsv4root_mnt.mnt_flag = (MNT_RDONLY | MNT_EXPORTED);
 2910         TAILQ_INIT(&nfsv4root_mnt.mnt_nvnodelist);
 2911         nfsv4root_mnt.mnt_export = NULL;
 2912         TAILQ_INIT(&nfsv4root_opt);
 2913         TAILQ_INIT(&nfsv4root_newopt);
 2914         nfsv4root_mnt.mnt_opt = &nfsv4root_opt;
 2915         nfsv4root_mnt.mnt_optnew = &nfsv4root_newopt;
 2916         nfsv4root_mnt.mnt_nvnodelistsize = 0;
 2917 }
 2918 
 2919 /*
 2920  * Get a vnode for a file handle, without checking exports, etc.
 2921  */
 2922 struct vnode *
 2923 nfsvno_getvp(fhandle_t *fhp)
 2924 {
 2925         struct mount *mp;
 2926         struct vnode *vp;
 2927         int error;
 2928 
 2929         mp = vfs_busyfs(&fhp->fh_fsid);
 2930         if (mp == NULL)
 2931                 return (NULL);
 2932         error = VFS_FHTOVP(mp, &fhp->fh_fid, &vp);
 2933         vfs_unbusy(mp);
 2934         if (error)
 2935                 return (NULL);
 2936         return (vp);
 2937 }
 2938 
 2939 /*
 2940  * Do a local VOP_ADVLOCK().
 2941  */
 2942 int
 2943 nfsvno_advlock(struct vnode *vp, int ftype, u_int64_t first,
 2944     u_int64_t end, struct thread *td)
 2945 {
 2946         int error = 0;
 2947         struct flock fl;
 2948         u_int64_t tlen;
 2949 
 2950         if (nfsrv_dolocallocks == 0)
 2951                 goto out;
 2952 
 2953         /* Check for VI_DOOMED here, so that VOP_ADVLOCK() isn't performed. */
 2954         if ((vp->v_iflag & VI_DOOMED) != 0) {
 2955                 error = EPERM;
 2956                 goto out;
 2957         }
 2958 
 2959         fl.l_whence = SEEK_SET;
 2960         fl.l_type = ftype;
 2961         fl.l_start = (off_t)first;
 2962         if (end == NFS64BITSSET) {
 2963                 fl.l_len = 0;
 2964         } else {
 2965                 tlen = end - first;
 2966                 fl.l_len = (off_t)tlen;
 2967         }
 2968         /*
 2969          * For FreeBSD8, the l_pid and l_sysid must be set to the same
 2970          * values for all calls, so that all locks will be held by the
 2971          * nfsd server. (The nfsd server handles conflicts between the
 2972          * various clients.)
 2973          * Since an NFSv4 lockowner is a ClientID plus an array of up to 1024
 2974          * bytes, so it can't be put in l_sysid.
 2975          */
 2976         if (nfsv4_sysid == 0)
 2977                 nfsv4_sysid = nlm_acquire_next_sysid();
 2978         fl.l_pid = (pid_t)0;
 2979         fl.l_sysid = (int)nfsv4_sysid;
 2980 
 2981         NFSVOPUNLOCK(vp, 0);
 2982         if (ftype == F_UNLCK)
 2983                 error = VOP_ADVLOCK(vp, (caddr_t)td->td_proc, F_UNLCK, &fl,
 2984                     (F_POSIX | F_REMOTE));
 2985         else
 2986                 error = VOP_ADVLOCK(vp, (caddr_t)td->td_proc, F_SETLK, &fl,
 2987                     (F_POSIX | F_REMOTE));
 2988         NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
 2989 
 2990 out:
 2991         NFSEXITCODE(error);
 2992         return (error);
 2993 }
 2994 
 2995 /*
 2996  * Check the nfsv4 root exports.
 2997  */
 2998 int
 2999 nfsvno_v4rootexport(struct nfsrv_descript *nd)
 3000 {
 3001         struct ucred *credanon;
 3002         int exflags, error = 0, numsecflavor, *secflavors, i;
 3003 
 3004         error = vfs_stdcheckexp(&nfsv4root_mnt, nd->nd_nam, &exflags,
 3005             &credanon, &numsecflavor, &secflavors);
 3006         if (error) {
 3007                 error = NFSERR_PROGUNAVAIL;
 3008                 goto out;
 3009         }
 3010         if (credanon != NULL)
 3011                 crfree(credanon);
 3012         for (i = 0; i < numsecflavor; i++) {
 3013                 if (secflavors[i] == AUTH_SYS)
 3014                         nd->nd_flag |= ND_EXAUTHSYS;
 3015                 else if (secflavors[i] == RPCSEC_GSS_KRB5)
 3016                         nd->nd_flag |= ND_EXGSS;
 3017                 else if (secflavors[i] == RPCSEC_GSS_KRB5I)
 3018                         nd->nd_flag |= ND_EXGSSINTEGRITY;
 3019                 else if (secflavors[i] == RPCSEC_GSS_KRB5P)
 3020                         nd->nd_flag |= ND_EXGSSPRIVACY;
 3021         }
 3022 
 3023 out:
 3024         NFSEXITCODE(error);
 3025         return (error);
 3026 }
 3027 
 3028 /*
 3029  * Nfs server psuedo system call for the nfsd's
 3030  */
 3031 /*
 3032  * MPSAFE
 3033  */
 3034 static int
 3035 nfssvc_nfsd(struct thread *td, struct nfssvc_args *uap)
 3036 {
 3037         struct file *fp;
 3038         struct nfsd_addsock_args sockarg;
 3039         struct nfsd_nfsd_args nfsdarg;
 3040         int error;
 3041 
 3042         if (uap->flag & NFSSVC_NFSDADDSOCK) {
 3043                 error = copyin(uap->argp, (caddr_t)&sockarg, sizeof (sockarg));
 3044                 if (error)
 3045                         goto out;
 3046                 if ((error = fget(td, sockarg.sock, &fp)) != 0)
 3047                         goto out;
 3048                 if (fp->f_type != DTYPE_SOCKET) {
 3049                         fdrop(fp, td);
 3050                         error = EPERM;
 3051                         goto out;
 3052                 }
 3053                 error = nfsrvd_addsock(fp);
 3054                 fdrop(fp, td);
 3055         } else if (uap->flag & NFSSVC_NFSDNFSD) {
 3056                 if (uap->argp == NULL) {
 3057                         error = EINVAL;
 3058                         goto out;
 3059                 }
 3060                 error = copyin(uap->argp, (caddr_t)&nfsdarg,
 3061                     sizeof (nfsdarg));
 3062                 if (error)
 3063                         goto out;
 3064                 error = nfsrvd_nfsd(td, &nfsdarg);
 3065         } else {
 3066                 error = nfssvc_srvcall(td, uap, td->td_ucred);
 3067         }
 3068 
 3069 out:
 3070         NFSEXITCODE(error);
 3071         return (error);
 3072 }
 3073 
 3074 static int
 3075 nfssvc_srvcall(struct thread *p, struct nfssvc_args *uap, struct ucred *cred)
 3076 {
 3077         struct nfsex_args export;
 3078         struct file *fp = NULL;
 3079         int stablefd, len;
 3080         struct nfsd_clid adminrevoke;
 3081         struct nfsd_dumplist dumplist;
 3082         struct nfsd_dumpclients *dumpclients;
 3083         struct nfsd_dumplocklist dumplocklist;
 3084         struct nfsd_dumplocks *dumplocks;
 3085         struct nameidata nd;
 3086         vnode_t vp;
 3087         int error = EINVAL;
 3088         struct proc *procp;
 3089 
 3090         if (uap->flag & NFSSVC_PUBLICFH) {
 3091                 NFSBZERO((caddr_t)&nfs_pubfh.nfsrvfh_data,
 3092                     sizeof (fhandle_t));
 3093                 error = copyin(uap->argp,
 3094                     &nfs_pubfh.nfsrvfh_data, sizeof (fhandle_t));
 3095                 if (!error)
 3096                         nfs_pubfhset = 1;
 3097         } else if (uap->flag & NFSSVC_V4ROOTEXPORT) {
 3098                 error = copyin(uap->argp,(caddr_t)&export,
 3099                     sizeof (struct nfsex_args));
 3100                 if (!error)
 3101                         error = nfsrv_v4rootexport(&export, cred, p);
 3102         } else if (uap->flag & NFSSVC_NOPUBLICFH) {
 3103                 nfs_pubfhset = 0;
 3104                 error = 0;
 3105         } else if (uap->flag & NFSSVC_STABLERESTART) {
 3106                 error = copyin(uap->argp, (caddr_t)&stablefd,
 3107                     sizeof (int));
 3108                 if (!error)
 3109                         error = fp_getfvp(p, stablefd, &fp, &vp);
 3110                 if (!error && (NFSFPFLAG(fp) & (FREAD | FWRITE)) != (FREAD | FWRITE))
 3111                         error = EBADF;
 3112                 if (!error && newnfs_numnfsd != 0)
 3113                         error = EPERM;
 3114                 if (!error) {
 3115                         nfsrv_stablefirst.nsf_fp = fp;
 3116                         nfsrv_setupstable(p);
 3117                 }
 3118         } else if (uap->flag & NFSSVC_ADMINREVOKE) {
 3119                 error = copyin(uap->argp, (caddr_t)&adminrevoke,
 3120                     sizeof (struct nfsd_clid));
 3121                 if (!error)
 3122                         error = nfsrv_adminrevoke(&adminrevoke, p);
 3123         } else if (uap->flag & NFSSVC_DUMPCLIENTS) {
 3124                 error = copyin(uap->argp, (caddr_t)&dumplist,
 3125                     sizeof (struct nfsd_dumplist));
 3126                 if (!error && (dumplist.ndl_size < 1 ||
 3127                         dumplist.ndl_size > NFSRV_MAXDUMPLIST))
 3128                         error = EPERM;
 3129                 if (!error) {
 3130                     len = sizeof (struct nfsd_dumpclients) * dumplist.ndl_size;
 3131                     dumpclients = (struct nfsd_dumpclients *)malloc(len,
 3132                         M_TEMP, M_WAITOK);
 3133                     nfsrv_dumpclients(dumpclients, dumplist.ndl_size);
 3134                     error = copyout(dumpclients,
 3135                         CAST_USER_ADDR_T(dumplist.ndl_list), len);
 3136                     free((caddr_t)dumpclients, M_TEMP);
 3137                 }
 3138         } else if (uap->flag & NFSSVC_DUMPLOCKS) {
 3139                 error = copyin(uap->argp, (caddr_t)&dumplocklist,
 3140                     sizeof (struct nfsd_dumplocklist));
 3141                 if (!error && (dumplocklist.ndllck_size < 1 ||
 3142                         dumplocklist.ndllck_size > NFSRV_MAXDUMPLIST))
 3143                         error = EPERM;
 3144                 if (!error)
 3145                         error = nfsrv_lookupfilename(&nd,
 3146                                 dumplocklist.ndllck_fname, p);
 3147                 if (!error) {
 3148                         len = sizeof (struct nfsd_dumplocks) *
 3149                                 dumplocklist.ndllck_size;
 3150                         dumplocks = (struct nfsd_dumplocks *)malloc(len,
 3151                                 M_TEMP, M_WAITOK);
 3152                         nfsrv_dumplocks(nd.ni_vp, dumplocks,
 3153                             dumplocklist.ndllck_size, p);
 3154                         vput(nd.ni_vp);
 3155                         error = copyout(dumplocks,
 3156                             CAST_USER_ADDR_T(dumplocklist.ndllck_list), len);
 3157                         free((caddr_t)dumplocks, M_TEMP);
 3158                 }
 3159         } else if (uap->flag & NFSSVC_BACKUPSTABLE) {
 3160                 procp = p->td_proc;
 3161                 PROC_LOCK(procp);
 3162                 nfsd_master_pid = procp->p_pid;
 3163                 bcopy(procp->p_comm, nfsd_master_comm, MAXCOMLEN + 1);
 3164                 nfsd_master_start = procp->p_stats->p_start;
 3165                 nfsd_master_proc = procp;
 3166                 PROC_UNLOCK(procp);
 3167         }
 3168 
 3169         NFSEXITCODE(error);
 3170         return (error);
 3171 }
 3172 
 3173 /*
 3174  * Check exports.
 3175  * Returns 0 if ok, 1 otherwise.
 3176  */
 3177 int
 3178 nfsvno_testexp(struct nfsrv_descript *nd, struct nfsexstuff *exp)
 3179 {
 3180         int i;
 3181 
 3182         /*
 3183          * This seems odd, but allow the case where the security flavor
 3184          * list is empty. This happens when NFSv4 is traversing non-exported
 3185          * file systems. Exported file systems should always have a non-empty
 3186          * security flavor list.
 3187          */
 3188         if (exp->nes_numsecflavor == 0)
 3189                 return (0);
 3190 
 3191         for (i = 0; i < exp->nes_numsecflavor; i++) {
 3192                 /*
 3193                  * The tests for privacy and integrity must be first,
 3194                  * since ND_GSS is set for everything but AUTH_SYS.
 3195                  */
 3196                 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5P &&
 3197                     (nd->nd_flag & ND_GSSPRIVACY))
 3198                         return (0);
 3199                 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5I &&
 3200                     (nd->nd_flag & ND_GSSINTEGRITY))
 3201                         return (0);
 3202                 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5 &&
 3203                     (nd->nd_flag & ND_GSS))
 3204                         return (0);
 3205                 if (exp->nes_secflavors[i] == AUTH_SYS &&
 3206                     (nd->nd_flag & ND_GSS) == 0)
 3207                         return (0);
 3208         }
 3209         return (1);
 3210 }
 3211 
 3212 /*
 3213  * Calculate a hash value for the fid in a file handle.
 3214  */
 3215 uint32_t
 3216 nfsrv_hashfh(fhandle_t *fhp)
 3217 {
 3218         uint32_t hashval;
 3219 
 3220         hashval = hash32_buf(&fhp->fh_fid, sizeof(struct fid), 0);
 3221         return (hashval);
 3222 }
 3223 
 3224 /*
 3225  * Signal the userland master nfsd to backup the stable restart file.
 3226  */
 3227 void
 3228 nfsrv_backupstable(void)
 3229 {
 3230         struct proc *procp;
 3231 
 3232         if (nfsd_master_proc != NULL) {
 3233                 procp = pfind(nfsd_master_pid);
 3234                 /* Try to make sure it is the correct process. */
 3235                 if (procp == nfsd_master_proc &&
 3236                     procp->p_stats->p_start.tv_sec ==
 3237                     nfsd_master_start.tv_sec &&
 3238                     procp->p_stats->p_start.tv_usec ==
 3239                     nfsd_master_start.tv_usec &&
 3240                     strcmp(procp->p_comm, nfsd_master_comm) == 0)
 3241                         psignal(procp, SIGUSR2);
 3242                 else
 3243                         nfsd_master_proc = NULL;
 3244 
 3245                 if (procp != NULL)
 3246                         PROC_UNLOCK(procp);
 3247         }
 3248 }
 3249 
 3250 extern int (*nfsd_call_nfsd)(struct thread *, struct nfssvc_args *);
 3251 
 3252 /*
 3253  * Called once to initialize data structures...
 3254  */
 3255 static int
 3256 nfsd_modevent(module_t mod, int type, void *data)
 3257 {
 3258         int error = 0;
 3259         static int loaded = 0;
 3260 
 3261         switch (type) {
 3262         case MOD_LOAD:
 3263                 if (loaded)
 3264                         goto out;
 3265                 newnfs_portinit();
 3266                 mtx_init(&nfs_cache_mutex, "nfs_cache_mutex", NULL, MTX_DEF);
 3267                 mtx_init(&nfs_v4root_mutex, "nfs_v4root_mutex", NULL, MTX_DEF);
 3268                 mtx_init(&nfsv4root_mnt.mnt_mtx, "struct mount mtx", NULL,
 3269                     MTX_DEF);
 3270                 lockinit(&nfsv4root_mnt.mnt_explock, PVFS, "explock", 0, 0);
 3271                 nfsrvd_initcache();
 3272                 nfsd_init();
 3273                 NFSD_LOCK();
 3274                 nfsrvd_init(0);
 3275                 NFSD_UNLOCK();
 3276                 nfsd_mntinit();
 3277 #ifdef VV_DISABLEDELEG
 3278                 vn_deleg_ops.vndeleg_recall = nfsd_recalldelegation;
 3279                 vn_deleg_ops.vndeleg_disable = nfsd_disabledelegation;
 3280 #endif
 3281                 nfsd_call_servertimer = nfsrv_servertimer;
 3282                 nfsd_call_nfsd = nfssvc_nfsd;
 3283                 loaded = 1;
 3284                 break;
 3285 
 3286         case MOD_UNLOAD:
 3287                 if (newnfs_numnfsd != 0) {
 3288                         error = EBUSY;
 3289                         break;
 3290                 }
 3291 
 3292 #ifdef VV_DISABLEDELEG
 3293                 vn_deleg_ops.vndeleg_recall = NULL;
 3294                 vn_deleg_ops.vndeleg_disable = NULL;
 3295 #endif
 3296                 nfsd_call_servertimer = NULL;
 3297                 nfsd_call_nfsd = NULL;
 3298 
 3299                 /* Clean out all NFSv4 state. */
 3300                 nfsrv_throwawayallstate(curthread);
 3301 
 3302                 /* Clean the NFS server reply cache */
 3303                 nfsrvd_cleancache();
 3304 
 3305                 /* Free up the krpc server pool. */
 3306                 if (nfsrvd_pool != NULL)
 3307                         svcpool_destroy(nfsrvd_pool);
 3308 
 3309                 /* and get rid of the locks */
 3310                 mtx_destroy(&nfs_cache_mutex);
 3311                 mtx_destroy(&nfs_v4root_mutex);
 3312                 mtx_destroy(&nfsv4root_mnt.mnt_mtx);
 3313                 lockdestroy(&nfsv4root_mnt.mnt_explock);
 3314                 loaded = 0;
 3315                 break;
 3316         default:
 3317                 error = EOPNOTSUPP;
 3318                 break;
 3319         }
 3320 
 3321 out:
 3322         NFSEXITCODE(error);
 3323         return (error);
 3324 }
 3325 static moduledata_t nfsd_mod = {
 3326         "nfsd",
 3327         nfsd_modevent,
 3328         NULL,
 3329 };
 3330 DECLARE_MODULE(nfsd, nfsd_mod, SI_SUB_VFS, SI_ORDER_ANY);
 3331 
 3332 /* So that loader and kldload(2) can find us, wherever we are.. */
 3333 MODULE_VERSION(nfsd, 1);
 3334 MODULE_DEPEND(nfsd, nfscommon, 1, 1, 1);
 3335 MODULE_DEPEND(nfsd, nfslock, 1, 1, 1);
 3336 MODULE_DEPEND(nfsd, nfslockd, 1, 1, 1);
 3337 MODULE_DEPEND(nfsd, krpc, 1, 1, 1);
 3338 MODULE_DEPEND(nfsd, nfssvc, 1, 1, 1);
 3339 

Cache object: a287069ea07c93c3cfc43ded2a65e609


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