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/9.0/sys/fs/nfsserver/nfs_nfsdport.c 225617 2011-09-16 13:58:51Z kmacy $");
   36 
   37 #include <sys/capability.h>
   38 
   39 /*
   40  * Functions that perform the vfs operations required by the routines in
   41  * nfsd_serv.c. It is hoped that this change will make the server more
   42  * portable.
   43  */
   44 
   45 #include <fs/nfs/nfsport.h>
   46 #include <sys/hash.h>
   47 #include <sys/sysctl.h>
   48 #include <nlm/nlm_prot.h>
   49 #include <nlm/nlm.h>
   50 
   51 FEATURE(nfsd, "NFSv4 server");
   52 
   53 extern u_int32_t newnfs_true, newnfs_false, newnfs_xdrneg1;
   54 extern int nfsrv_useacl;
   55 extern int newnfs_numnfsd;
   56 extern struct mount nfsv4root_mnt;
   57 extern struct nfsrv_stablefirst nfsrv_stablefirst;
   58 extern void (*nfsd_call_servertimer)(void);
   59 extern SVCPOOL  *nfsrvd_pool;
   60 struct vfsoptlist nfsv4root_opt, nfsv4root_newopt;
   61 NFSDLOCKMUTEX;
   62 struct mtx nfs_cache_mutex;
   63 struct mtx nfs_v4root_mutex;
   64 struct nfsrvfh nfs_rootfh, nfs_pubfh;
   65 int nfs_pubfhset = 0, nfs_rootfhset = 0;
   66 struct proc *nfsd_master_proc = NULL;
   67 static pid_t nfsd_master_pid = (pid_t)-1;
   68 static char nfsd_master_comm[MAXCOMLEN + 1];
   69 static struct timeval nfsd_master_start;
   70 static uint32_t nfsv4_sysid = 0;
   71 
   72 static int nfssvc_srvcall(struct thread *, struct nfssvc_args *,
   73     struct ucred *);
   74 
   75 int nfsrv_enable_crossmntpt = 1;
   76 static int nfs_commit_blks;
   77 static int nfs_commit_miss;
   78 extern int nfsrv_issuedelegs;
   79 extern int nfsrv_dolocallocks;
   80 
   81 SYSCTL_NODE(_vfs, OID_AUTO, nfsd, CTLFLAG_RW, 0, "New NFS server");
   82 SYSCTL_INT(_vfs_nfsd, OID_AUTO, mirrormnt, CTLFLAG_RW,
   83     &nfsrv_enable_crossmntpt, 0, "Enable nfsd to cross mount points");
   84 SYSCTL_INT(_vfs_nfsd, OID_AUTO, commit_blks, CTLFLAG_RW, &nfs_commit_blks,
   85     0, "");
   86 SYSCTL_INT(_vfs_nfsd, OID_AUTO, commit_miss, CTLFLAG_RW, &nfs_commit_miss,
   87     0, "");
   88 SYSCTL_INT(_vfs_nfsd, OID_AUTO, issue_delegations, CTLFLAG_RW,
   89     &nfsrv_issuedelegs, 0, "Enable nfsd to issue delegations");
   90 SYSCTL_INT(_vfs_nfsd, OID_AUTO, enable_locallocks, CTLFLAG_RW,
   91     &nfsrv_dolocallocks, 0, "Enable nfsd to acquire local locks on files");
   92 
   93 #define NUM_HEURISTIC           1017
   94 #define NHUSE_INIT              64
   95 #define NHUSE_INC               16
   96 #define NHUSE_MAX               2048
   97 
   98 static struct nfsheur {
   99         struct vnode *nh_vp;    /* vp to match (unreferenced pointer) */
  100         off_t nh_nextr;         /* next offset for sequential detection */
  101         int nh_use;             /* use count for selection */
  102         int nh_seqcount;        /* heuristic */
  103 } nfsheur[NUM_HEURISTIC];
  104 
  105 
  106 /*
  107  * Get attributes into nfsvattr structure.
  108  */
  109 int
  110 nfsvno_getattr(struct vnode *vp, struct nfsvattr *nvap, struct ucred *cred,
  111     struct thread *p, int vpislocked)
  112 {
  113         int error, lockedit = 0;
  114 
  115         if (vpislocked == 0) {
  116                 /*
  117                  * When vpislocked == 0, the vnode is either exclusively
  118                  * locked by this thread or not locked by this thread.
  119                  * As such, shared lock it, if not exclusively locked.
  120                  */
  121                 if (NFSVOPISLOCKED(vp) != LK_EXCLUSIVE) {
  122                         lockedit = 1;
  123                         NFSVOPLOCK(vp, LK_SHARED | LK_RETRY);
  124                 }
  125         }
  126         error = VOP_GETATTR(vp, &nvap->na_vattr, cred);
  127         if (lockedit != 0)
  128                 NFSVOPUNLOCK(vp, 0);
  129 
  130         NFSEXITCODE(error);
  131         return (error);
  132 }
  133 
  134 /*
  135  * Get a file handle for a vnode.
  136  */
  137 int
  138 nfsvno_getfh(struct vnode *vp, fhandle_t *fhp, struct thread *p)
  139 {
  140         int error;
  141 
  142         NFSBZERO((caddr_t)fhp, sizeof(fhandle_t));
  143         fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid;
  144         error = VOP_VPTOFH(vp, &fhp->fh_fid);
  145 
  146         NFSEXITCODE(error);
  147         return (error);
  148 }
  149 
  150 /*
  151  * Perform access checking for vnodes obtained from file handles that would
  152  * refer to files already opened by a Unix client. You cannot just use
  153  * vn_writechk() and VOP_ACCESSX() for two reasons.
  154  * 1 - You must check for exported rdonly as well as MNT_RDONLY for the write
  155  *     case.
  156  * 2 - The owner is to be given access irrespective of mode bits for some
  157  *     operations, so that processes that chmod after opening a file don't
  158  *     break.
  159  */
  160 int
  161 nfsvno_accchk(struct vnode *vp, accmode_t accmode, struct ucred *cred,
  162     struct nfsexstuff *exp, struct thread *p, int override, int vpislocked,
  163     u_int32_t *supportedtypep)
  164 {
  165         struct vattr vattr;
  166         int error = 0, getret = 0;
  167 
  168         if (vpislocked == 0) {
  169                 if (NFSVOPLOCK(vp, LK_SHARED) != 0) {
  170                         error = EPERM;
  171                         goto out;
  172                 }
  173         }
  174         if (accmode & VWRITE) {
  175                 /* Just vn_writechk() changed to check rdonly */
  176                 /*
  177                  * Disallow write attempts on read-only file systems;
  178                  * unless the file is a socket or a block or character
  179                  * device resident on the file system.
  180                  */
  181                 if (NFSVNO_EXRDONLY(exp) ||
  182                     (vp->v_mount->mnt_flag & MNT_RDONLY)) {
  183                         switch (vp->v_type) {
  184                         case VREG:
  185                         case VDIR:
  186                         case VLNK:
  187                                 error = EROFS;
  188                         default:
  189                                 break;
  190                         }
  191                 }
  192                 /*
  193                  * If there's shared text associated with
  194                  * the inode, try to free it up once.  If
  195                  * we fail, we can't allow writing.
  196                  */
  197                 if ((vp->v_vflag & VV_TEXT) != 0 && error == 0)
  198                         error = ETXTBSY;
  199         }
  200         if (error != 0) {
  201                 if (vpislocked == 0)
  202                         NFSVOPUNLOCK(vp, 0);
  203                 goto out;
  204         }
  205 
  206         /*
  207          * Should the override still be applied when ACLs are enabled?
  208          */
  209         error = VOP_ACCESSX(vp, accmode, cred, p);
  210         if (error != 0 && (accmode & (VDELETE | VDELETE_CHILD))) {
  211                 /*
  212                  * Try again with VEXPLICIT_DENY, to see if the test for
  213                  * deletion is supported.
  214                  */
  215                 error = VOP_ACCESSX(vp, accmode | VEXPLICIT_DENY, cred, p);
  216                 if (error == 0) {
  217                         if (vp->v_type == VDIR) {
  218                                 accmode &= ~(VDELETE | VDELETE_CHILD);
  219                                 accmode |= VWRITE;
  220                                 error = VOP_ACCESSX(vp, accmode, cred, p);
  221                         } else if (supportedtypep != NULL) {
  222                                 *supportedtypep &= ~NFSACCESS_DELETE;
  223                         }
  224                 }
  225         }
  226 
  227         /*
  228          * Allow certain operations for the owner (reads and writes
  229          * on files that are already open).
  230          */
  231         if (override != NFSACCCHK_NOOVERRIDE &&
  232             (error == EPERM || error == EACCES)) {
  233                 if (cred->cr_uid == 0 && (override & NFSACCCHK_ALLOWROOT))
  234                         error = 0;
  235                 else if (override & NFSACCCHK_ALLOWOWNER) {
  236                         getret = VOP_GETATTR(vp, &vattr, cred);
  237                         if (getret == 0 && cred->cr_uid == vattr.va_uid)
  238                                 error = 0;
  239                 }
  240         }
  241         if (vpislocked == 0)
  242                 NFSVOPUNLOCK(vp, 0);
  243 
  244 out:
  245         NFSEXITCODE(error);
  246         return (error);
  247 }
  248 
  249 /*
  250  * Set attribute(s) vnop.
  251  */
  252 int
  253 nfsvno_setattr(struct vnode *vp, struct nfsvattr *nvap, struct ucred *cred,
  254     struct thread *p, struct nfsexstuff *exp)
  255 {
  256         int error;
  257 
  258         error = VOP_SETATTR(vp, &nvap->na_vattr, cred);
  259         NFSEXITCODE(error);
  260         return (error);
  261 }
  262 
  263 /*
  264  * Set up nameidata for a lookup() call and do it
  265  * For the cases where we are crossing mount points
  266  * (looking up the public fh path or the v4 root path when
  267  *  not using a pseudo-root fs), set/release the Giant lock,
  268  * as required.
  269  */
  270 int
  271 nfsvno_namei(struct nfsrv_descript *nd, struct nameidata *ndp,
  272     struct vnode *dp, int islocked, struct nfsexstuff *exp, struct thread *p,
  273     struct vnode **retdirp)
  274 {
  275         struct componentname *cnp = &ndp->ni_cnd;
  276         int i;
  277         struct iovec aiov;
  278         struct uio auio;
  279         int lockleaf = (cnp->cn_flags & LOCKLEAF) != 0, linklen;
  280         int error = 0, crossmnt;
  281         char *cp;
  282 
  283         *retdirp = NULL;
  284         cnp->cn_nameptr = cnp->cn_pnbuf;
  285         ndp->ni_strictrelative = 0;
  286         /*
  287          * Extract and set starting directory.
  288          */
  289         if (dp->v_type != VDIR) {
  290                 if (islocked)
  291                         vput(dp);
  292                 else
  293                         vrele(dp);
  294                 nfsvno_relpathbuf(ndp);
  295                 error = ENOTDIR;
  296                 goto out1;
  297         }
  298         if (islocked)
  299                 NFSVOPUNLOCK(dp, 0);
  300         VREF(dp);
  301         *retdirp = dp;
  302         if (NFSVNO_EXRDONLY(exp))
  303                 cnp->cn_flags |= RDONLY;
  304         ndp->ni_segflg = UIO_SYSSPACE;
  305         crossmnt = 1;
  306 
  307         if (nd->nd_flag & ND_PUBLOOKUP) {
  308                 ndp->ni_loopcnt = 0;
  309                 if (cnp->cn_pnbuf[0] == '/') {
  310                         vrele(dp);
  311                         /*
  312                          * Check for degenerate pathnames here, since lookup()
  313                          * panics on them.
  314                          */
  315                         for (i = 1; i < ndp->ni_pathlen; i++)
  316                                 if (cnp->cn_pnbuf[i] != '/')
  317                                         break;
  318                         if (i == ndp->ni_pathlen) {
  319                                 error = NFSERR_ACCES;
  320                                 goto out;
  321                         }
  322                         dp = rootvnode;
  323                         VREF(dp);
  324                 }
  325         } else if ((nfsrv_enable_crossmntpt == 0 && NFSVNO_EXPORTED(exp)) ||
  326             (nd->nd_flag & ND_NFSV4) == 0) {
  327                 /*
  328                  * Only cross mount points for NFSv4 when doing a
  329                  * mount while traversing the file system above
  330                  * the mount point, unless nfsrv_enable_crossmntpt is set.
  331                  */
  332                 cnp->cn_flags |= NOCROSSMOUNT;
  333                 crossmnt = 0;
  334         }
  335 
  336         /*
  337          * Initialize for scan, set ni_startdir and bump ref on dp again
  338          * becuase lookup() will dereference ni_startdir.
  339          */
  340 
  341         cnp->cn_thread = p;
  342         ndp->ni_startdir = dp;
  343         ndp->ni_rootdir = rootvnode;
  344 
  345         if (!lockleaf)
  346                 cnp->cn_flags |= LOCKLEAF;
  347         for (;;) {
  348                 cnp->cn_nameptr = cnp->cn_pnbuf;
  349                 /*
  350                  * Call lookup() to do the real work.  If an error occurs,
  351                  * ndp->ni_vp and ni_dvp are left uninitialized or NULL and
  352                  * we do not have to dereference anything before returning.
  353                  * In either case ni_startdir will be dereferenced and NULLed
  354                  * out.
  355                  */
  356                 error = lookup(ndp);
  357                 if (error)
  358                         break;
  359 
  360                 /*
  361                  * Check for encountering a symbolic link.  Trivial
  362                  * termination occurs if no symlink encountered.
  363                  */
  364                 if ((cnp->cn_flags & ISSYMLINK) == 0) {
  365                         if ((cnp->cn_flags & (SAVENAME | SAVESTART)) == 0)
  366                                 nfsvno_relpathbuf(ndp);
  367                         if (ndp->ni_vp && !lockleaf)
  368                                 NFSVOPUNLOCK(ndp->ni_vp, 0);
  369                         break;
  370                 }
  371 
  372                 /*
  373                  * Validate symlink
  374                  */
  375                 if ((cnp->cn_flags & LOCKPARENT) && ndp->ni_pathlen == 1)
  376                         NFSVOPUNLOCK(ndp->ni_dvp, 0);
  377                 if (!(nd->nd_flag & ND_PUBLOOKUP)) {
  378                         error = EINVAL;
  379                         goto badlink2;
  380                 }
  381 
  382                 if (ndp->ni_loopcnt++ >= MAXSYMLINKS) {
  383                         error = ELOOP;
  384                         goto badlink2;
  385                 }
  386                 if (ndp->ni_pathlen > 1)
  387                         cp = uma_zalloc(namei_zone, M_WAITOK);
  388                 else
  389                         cp = cnp->cn_pnbuf;
  390                 aiov.iov_base = cp;
  391                 aiov.iov_len = MAXPATHLEN;
  392                 auio.uio_iov = &aiov;
  393                 auio.uio_iovcnt = 1;
  394                 auio.uio_offset = 0;
  395                 auio.uio_rw = UIO_READ;
  396                 auio.uio_segflg = UIO_SYSSPACE;
  397                 auio.uio_td = NULL;
  398                 auio.uio_resid = MAXPATHLEN;
  399                 error = VOP_READLINK(ndp->ni_vp, &auio, cnp->cn_cred);
  400                 if (error) {
  401                 badlink1:
  402                         if (ndp->ni_pathlen > 1)
  403                                 uma_zfree(namei_zone, cp);
  404                 badlink2:
  405                         vrele(ndp->ni_dvp);
  406                         vput(ndp->ni_vp);
  407                         break;
  408                 }
  409                 linklen = MAXPATHLEN - auio.uio_resid;
  410                 if (linklen == 0) {
  411                         error = ENOENT;
  412                         goto badlink1;
  413                 }
  414                 if (linklen + ndp->ni_pathlen >= MAXPATHLEN) {
  415                         error = ENAMETOOLONG;
  416                         goto badlink1;
  417                 }
  418 
  419                 /*
  420                  * Adjust or replace path
  421                  */
  422                 if (ndp->ni_pathlen > 1) {
  423                         NFSBCOPY(ndp->ni_next, cp + linklen, ndp->ni_pathlen);
  424                         uma_zfree(namei_zone, cnp->cn_pnbuf);
  425                         cnp->cn_pnbuf = cp;
  426                 } else
  427                         cnp->cn_pnbuf[linklen] = '\0';
  428                 ndp->ni_pathlen += linklen;
  429 
  430                 /*
  431                  * Cleanup refs for next loop and check if root directory
  432                  * should replace current directory.  Normally ni_dvp
  433                  * becomes the new base directory and is cleaned up when
  434                  * we loop.  Explicitly null pointers after invalidation
  435                  * to clarify operation.
  436                  */
  437                 vput(ndp->ni_vp);
  438                 ndp->ni_vp = NULL;
  439 
  440                 if (cnp->cn_pnbuf[0] == '/') {
  441                         vrele(ndp->ni_dvp);
  442                         ndp->ni_dvp = ndp->ni_rootdir;
  443                         VREF(ndp->ni_dvp);
  444                 }
  445                 ndp->ni_startdir = ndp->ni_dvp;
  446                 ndp->ni_dvp = NULL;
  447         }
  448         if (!lockleaf)
  449                 cnp->cn_flags &= ~LOCKLEAF;
  450 
  451 out:
  452         if (error) {
  453                 uma_zfree(namei_zone, cnp->cn_pnbuf);
  454                 ndp->ni_vp = NULL;
  455                 ndp->ni_dvp = NULL;
  456                 ndp->ni_startdir = NULL;
  457                 cnp->cn_flags &= ~HASBUF;
  458         } else if ((ndp->ni_cnd.cn_flags & (WANTPARENT|LOCKPARENT)) == 0) {
  459                 ndp->ni_dvp = NULL;
  460         }
  461 
  462 out1:
  463         NFSEXITCODE2(error, nd);
  464         return (error);
  465 }
  466 
  467 /*
  468  * Set up a pathname buffer and return a pointer to it and, optionally
  469  * set a hash pointer.
  470  */
  471 void
  472 nfsvno_setpathbuf(struct nameidata *ndp, char **bufpp, u_long **hashpp)
  473 {
  474         struct componentname *cnp = &ndp->ni_cnd;
  475 
  476         cnp->cn_flags |= (NOMACCHECK | HASBUF);
  477         cnp->cn_pnbuf = uma_zalloc(namei_zone, M_WAITOK);
  478         if (hashpp != NULL)
  479                 *hashpp = NULL;
  480         *bufpp = cnp->cn_pnbuf;
  481 }
  482 
  483 /*
  484  * Release the above path buffer, if not released by nfsvno_namei().
  485  */
  486 void
  487 nfsvno_relpathbuf(struct nameidata *ndp)
  488 {
  489 
  490         if ((ndp->ni_cnd.cn_flags & HASBUF) == 0)
  491                 panic("nfsrelpath");
  492         uma_zfree(namei_zone, ndp->ni_cnd.cn_pnbuf);
  493         ndp->ni_cnd.cn_flags &= ~HASBUF;
  494 }
  495 
  496 /*
  497  * Readlink vnode op into an mbuf list.
  498  */
  499 int
  500 nfsvno_readlink(struct vnode *vp, struct ucred *cred, struct thread *p,
  501     struct mbuf **mpp, struct mbuf **mpendp, int *lenp)
  502 {
  503         struct iovec iv[(NFS_MAXPATHLEN+MLEN-1)/MLEN];
  504         struct iovec *ivp = iv;
  505         struct uio io, *uiop = &io;
  506         struct mbuf *mp, *mp2 = NULL, *mp3 = NULL;
  507         int i, len, tlen, error = 0;
  508 
  509         len = 0;
  510         i = 0;
  511         while (len < NFS_MAXPATHLEN) {
  512                 NFSMGET(mp);
  513                 MCLGET(mp, M_WAIT);
  514                 mp->m_len = NFSMSIZ(mp);
  515                 if (len == 0) {
  516                         mp3 = mp2 = mp;
  517                 } else {
  518                         mp2->m_next = mp;
  519                         mp2 = mp;
  520                 }
  521                 if ((len + mp->m_len) > NFS_MAXPATHLEN) {
  522                         mp->m_len = NFS_MAXPATHLEN - len;
  523                         len = NFS_MAXPATHLEN;
  524                 } else {
  525                         len += mp->m_len;
  526                 }
  527                 ivp->iov_base = mtod(mp, caddr_t);
  528                 ivp->iov_len = mp->m_len;
  529                 i++;
  530                 ivp++;
  531         }
  532         uiop->uio_iov = iv;
  533         uiop->uio_iovcnt = i;
  534         uiop->uio_offset = 0;
  535         uiop->uio_resid = len;
  536         uiop->uio_rw = UIO_READ;
  537         uiop->uio_segflg = UIO_SYSSPACE;
  538         uiop->uio_td = NULL;
  539         error = VOP_READLINK(vp, uiop, cred);
  540         if (error) {
  541                 m_freem(mp3);
  542                 *lenp = 0;
  543                 goto out;
  544         }
  545         if (uiop->uio_resid > 0) {
  546                 len -= uiop->uio_resid;
  547                 tlen = NFSM_RNDUP(len);
  548                 nfsrv_adj(mp3, NFS_MAXPATHLEN - tlen, tlen - len);
  549         }
  550         *lenp = len;
  551         *mpp = mp3;
  552         *mpendp = mp;
  553 
  554 out:
  555         NFSEXITCODE(error);
  556         return (error);
  557 }
  558 
  559 /*
  560  * Read vnode op call into mbuf list.
  561  */
  562 int
  563 nfsvno_read(struct vnode *vp, off_t off, int cnt, struct ucred *cred,
  564     struct thread *p, struct mbuf **mpp, struct mbuf **mpendp)
  565 {
  566         struct mbuf *m;
  567         int i;
  568         struct iovec *iv;
  569         struct iovec *iv2;
  570         int error = 0, len, left, siz, tlen, ioflag = 0, hi, try = 32;
  571         struct mbuf *m2 = NULL, *m3;
  572         struct uio io, *uiop = &io;
  573         struct nfsheur *nh;
  574 
  575         /*
  576          * Calculate seqcount for heuristic
  577          */
  578         /*
  579          * Locate best candidate
  580          */
  581 
  582         hi = ((int)(vm_offset_t)vp / sizeof(struct vnode)) % NUM_HEURISTIC;
  583         nh = &nfsheur[hi];
  584 
  585         while (try--) {
  586                 if (nfsheur[hi].nh_vp == vp) {
  587                         nh = &nfsheur[hi];
  588                         break;
  589                 }
  590                 if (nfsheur[hi].nh_use > 0)
  591                         --nfsheur[hi].nh_use;
  592                 hi = (hi + 1) % NUM_HEURISTIC;
  593                 if (nfsheur[hi].nh_use < nh->nh_use)
  594                         nh = &nfsheur[hi];
  595         }
  596 
  597         if (nh->nh_vp != vp) {
  598                 nh->nh_vp = vp;
  599                 nh->nh_nextr = off;
  600                 nh->nh_use = NHUSE_INIT;
  601                 if (off == 0)
  602                         nh->nh_seqcount = 4;
  603                 else
  604                         nh->nh_seqcount = 1;
  605         }
  606 
  607         /*
  608          * Calculate heuristic
  609          */
  610 
  611         if ((off == 0 && nh->nh_seqcount > 0) || off == nh->nh_nextr) {
  612                 if (++nh->nh_seqcount > IO_SEQMAX)
  613                         nh->nh_seqcount = IO_SEQMAX;
  614         } else if (nh->nh_seqcount > 1) {
  615                 nh->nh_seqcount = 1;
  616         } else {
  617                 nh->nh_seqcount = 0;
  618         }
  619         nh->nh_use += NHUSE_INC;
  620         if (nh->nh_use > NHUSE_MAX)
  621                 nh->nh_use = NHUSE_MAX;
  622         ioflag |= nh->nh_seqcount << IO_SEQSHIFT;
  623 
  624         len = left = NFSM_RNDUP(cnt);
  625         m3 = NULL;
  626         /*
  627          * Generate the mbuf list with the uio_iov ref. to it.
  628          */
  629         i = 0;
  630         while (left > 0) {
  631                 NFSMGET(m);
  632                 MCLGET(m, M_WAIT);
  633                 m->m_len = 0;
  634                 siz = min(M_TRAILINGSPACE(m), left);
  635                 left -= siz;
  636                 i++;
  637                 if (m3)
  638                         m2->m_next = m;
  639                 else
  640                         m3 = m;
  641                 m2 = m;
  642         }
  643         MALLOC(iv, struct iovec *, i * sizeof (struct iovec),
  644             M_TEMP, M_WAITOK);
  645         uiop->uio_iov = iv2 = iv;
  646         m = m3;
  647         left = len;
  648         i = 0;
  649         while (left > 0) {
  650                 if (m == NULL)
  651                         panic("nfsvno_read iov");
  652                 siz = min(M_TRAILINGSPACE(m), left);
  653                 if (siz > 0) {
  654                         iv->iov_base = mtod(m, caddr_t) + m->m_len;
  655                         iv->iov_len = siz;
  656                         m->m_len += siz;
  657                         left -= siz;
  658                         iv++;
  659                         i++;
  660                 }
  661                 m = m->m_next;
  662         }
  663         uiop->uio_iovcnt = i;
  664         uiop->uio_offset = off;
  665         uiop->uio_resid = len;
  666         uiop->uio_rw = UIO_READ;
  667         uiop->uio_segflg = UIO_SYSSPACE;
  668         error = VOP_READ(vp, uiop, IO_NODELOCKED | ioflag, cred);
  669         FREE((caddr_t)iv2, M_TEMP);
  670         if (error) {
  671                 m_freem(m3);
  672                 *mpp = NULL;
  673                 goto out;
  674         }
  675         tlen = len - uiop->uio_resid;
  676         cnt = cnt < tlen ? cnt : tlen;
  677         tlen = NFSM_RNDUP(cnt);
  678         if (tlen == 0) {
  679                 m_freem(m3);
  680                 m3 = NULL;
  681         } else if (len != tlen || tlen != cnt)
  682                 nfsrv_adj(m3, len - tlen, tlen - cnt);
  683         *mpp = m3;
  684         *mpendp = m2;
  685 
  686 out:
  687         NFSEXITCODE(error);
  688         return (error);
  689 }
  690 
  691 /*
  692  * Write vnode op from an mbuf list.
  693  */
  694 int
  695 nfsvno_write(struct vnode *vp, off_t off, int retlen, int cnt, int stable,
  696     struct mbuf *mp, char *cp, struct ucred *cred, struct thread *p)
  697 {
  698         struct iovec *ivp;
  699         int i, len;
  700         struct iovec *iv;
  701         int ioflags, error;
  702         struct uio io, *uiop = &io;
  703 
  704         MALLOC(ivp, struct iovec *, cnt * sizeof (struct iovec), M_TEMP,
  705             M_WAITOK);
  706         uiop->uio_iov = iv = ivp;
  707         uiop->uio_iovcnt = cnt;
  708         i = mtod(mp, caddr_t) + mp->m_len - cp;
  709         len = retlen;
  710         while (len > 0) {
  711                 if (mp == NULL)
  712                         panic("nfsvno_write");
  713                 if (i > 0) {
  714                         i = min(i, len);
  715                         ivp->iov_base = cp;
  716                         ivp->iov_len = i;
  717                         ivp++;
  718                         len -= i;
  719                 }
  720                 mp = mp->m_next;
  721                 if (mp) {
  722                         i = mp->m_len;
  723                         cp = mtod(mp, caddr_t);
  724                 }
  725         }
  726 
  727         if (stable == NFSWRITE_UNSTABLE)
  728                 ioflags = IO_NODELOCKED;
  729         else
  730                 ioflags = (IO_SYNC | IO_NODELOCKED);
  731         uiop->uio_resid = retlen;
  732         uiop->uio_rw = UIO_WRITE;
  733         uiop->uio_segflg = UIO_SYSSPACE;
  734         NFSUIOPROC(uiop, p);
  735         uiop->uio_offset = off;
  736         error = VOP_WRITE(vp, uiop, ioflags, cred);
  737         FREE((caddr_t)iv, M_TEMP);
  738 
  739         NFSEXITCODE(error);
  740         return (error);
  741 }
  742 
  743 /*
  744  * Common code for creating a regular file (plus special files for V2).
  745  */
  746 int
  747 nfsvno_createsub(struct nfsrv_descript *nd, struct nameidata *ndp,
  748     struct vnode **vpp, struct nfsvattr *nvap, int *exclusive_flagp,
  749     int32_t *cverf, NFSDEV_T rdev, struct thread *p, struct nfsexstuff *exp)
  750 {
  751         u_quad_t tempsize;
  752         int error;
  753 
  754         error = nd->nd_repstat;
  755         if (!error && ndp->ni_vp == NULL) {
  756                 if (nvap->na_type == VREG || nvap->na_type == VSOCK) {
  757                         vrele(ndp->ni_startdir);
  758                         error = VOP_CREATE(ndp->ni_dvp,
  759                             &ndp->ni_vp, &ndp->ni_cnd, &nvap->na_vattr);
  760                         vput(ndp->ni_dvp);
  761                         nfsvno_relpathbuf(ndp);
  762                         if (!error) {
  763                                 if (*exclusive_flagp) {
  764                                         *exclusive_flagp = 0;
  765                                         NFSVNO_ATTRINIT(nvap);
  766                                         nvap->na_atime.tv_sec = cverf[0];
  767                                         nvap->na_atime.tv_nsec = cverf[1];
  768                                         error = VOP_SETATTR(ndp->ni_vp,
  769                                             &nvap->na_vattr, nd->nd_cred);
  770                                 }
  771                         }
  772                 /*
  773                  * NFS V2 Only. nfsrvd_mknod() does this for V3.
  774                  * (This implies, just get out on an error.)
  775                  */
  776                 } else if (nvap->na_type == VCHR || nvap->na_type == VBLK ||
  777                         nvap->na_type == VFIFO) {
  778                         if (nvap->na_type == VCHR && rdev == 0xffffffff)
  779                                 nvap->na_type = VFIFO;
  780                         if (nvap->na_type != VFIFO &&
  781                             (error = priv_check_cred(nd->nd_cred,
  782                              PRIV_VFS_MKNOD_DEV, 0))) {
  783                                 vrele(ndp->ni_startdir);
  784                                 nfsvno_relpathbuf(ndp);
  785                                 vput(ndp->ni_dvp);
  786                                 goto out;
  787                         }
  788                         nvap->na_rdev = rdev;
  789                         error = VOP_MKNOD(ndp->ni_dvp, &ndp->ni_vp,
  790                             &ndp->ni_cnd, &nvap->na_vattr);
  791                         vput(ndp->ni_dvp);
  792                         nfsvno_relpathbuf(ndp);
  793                         vrele(ndp->ni_startdir);
  794                         if (error)
  795                                 goto out;
  796                 } else {
  797                         vrele(ndp->ni_startdir);
  798                         nfsvno_relpathbuf(ndp);
  799                         vput(ndp->ni_dvp);
  800                         error = ENXIO;
  801                         goto out;
  802                 }
  803                 *vpp = ndp->ni_vp;
  804         } else {
  805                 /*
  806                  * Handle cases where error is already set and/or
  807                  * the file exists.
  808                  * 1 - clean up the lookup
  809                  * 2 - iff !error and na_size set, truncate it
  810                  */
  811                 vrele(ndp->ni_startdir);
  812                 nfsvno_relpathbuf(ndp);
  813                 *vpp = ndp->ni_vp;
  814                 if (ndp->ni_dvp == *vpp)
  815                         vrele(ndp->ni_dvp);
  816                 else
  817                         vput(ndp->ni_dvp);
  818                 if (!error && nvap->na_size != VNOVAL) {
  819                         error = nfsvno_accchk(*vpp, VWRITE,
  820                             nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
  821                             NFSACCCHK_VPISLOCKED, NULL);
  822                         if (!error) {
  823                                 tempsize = nvap->na_size;
  824                                 NFSVNO_ATTRINIT(nvap);
  825                                 nvap->na_size = tempsize;
  826                                 error = VOP_SETATTR(*vpp,
  827                                     &nvap->na_vattr, nd->nd_cred);
  828                         }
  829                 }
  830                 if (error)
  831                         vput(*vpp);
  832         }
  833 
  834 out:
  835         NFSEXITCODE(error);
  836         return (error);
  837 }
  838 
  839 /*
  840  * Do a mknod vnode op.
  841  */
  842 int
  843 nfsvno_mknod(struct nameidata *ndp, struct nfsvattr *nvap, struct ucred *cred,
  844     struct thread *p)
  845 {
  846         int error = 0;
  847         enum vtype vtyp;
  848 
  849         vtyp = nvap->na_type;
  850         /*
  851          * Iff doesn't exist, create it.
  852          */
  853         if (ndp->ni_vp) {
  854                 vrele(ndp->ni_startdir);
  855                 nfsvno_relpathbuf(ndp);
  856                 vput(ndp->ni_dvp);
  857                 vrele(ndp->ni_vp);
  858                 error = EEXIST;
  859                 goto out;
  860         }
  861         if (vtyp != VCHR && vtyp != VBLK && vtyp != VSOCK && vtyp != VFIFO) {
  862                 vrele(ndp->ni_startdir);
  863                 nfsvno_relpathbuf(ndp);
  864                 vput(ndp->ni_dvp);
  865                 error = NFSERR_BADTYPE;
  866                 goto out;
  867         }
  868         if (vtyp == VSOCK) {
  869                 vrele(ndp->ni_startdir);
  870                 error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp,
  871                     &ndp->ni_cnd, &nvap->na_vattr);
  872                 vput(ndp->ni_dvp);
  873                 nfsvno_relpathbuf(ndp);
  874         } else {
  875                 if (nvap->na_type != VFIFO &&
  876                     (error = priv_check_cred(cred, PRIV_VFS_MKNOD_DEV, 0))) {
  877                         vrele(ndp->ni_startdir);
  878                         nfsvno_relpathbuf(ndp);
  879                         vput(ndp->ni_dvp);
  880                         goto out;
  881                 }
  882                 error = VOP_MKNOD(ndp->ni_dvp, &ndp->ni_vp,
  883                     &ndp->ni_cnd, &nvap->na_vattr);
  884                 vput(ndp->ni_dvp);
  885                 nfsvno_relpathbuf(ndp);
  886                 vrele(ndp->ni_startdir);
  887                 /*
  888                  * Since VOP_MKNOD returns the ni_vp, I can't
  889                  * see any reason to do the lookup.
  890                  */
  891         }
  892 
  893 out:
  894         NFSEXITCODE(error);
  895         return (error);
  896 }
  897 
  898 /*
  899  * Mkdir vnode op.
  900  */
  901 int
  902 nfsvno_mkdir(struct nameidata *ndp, struct nfsvattr *nvap, uid_t saved_uid,
  903     struct ucred *cred, struct thread *p, struct nfsexstuff *exp)
  904 {
  905         int error = 0;
  906 
  907         if (ndp->ni_vp != NULL) {
  908                 if (ndp->ni_dvp == ndp->ni_vp)
  909                         vrele(ndp->ni_dvp);
  910                 else
  911                         vput(ndp->ni_dvp);
  912                 vrele(ndp->ni_vp);
  913                 nfsvno_relpathbuf(ndp);
  914                 error = EEXIST;
  915                 goto out;
  916         }
  917         error = VOP_MKDIR(ndp->ni_dvp, &ndp->ni_vp, &ndp->ni_cnd,
  918             &nvap->na_vattr);
  919         vput(ndp->ni_dvp);
  920         nfsvno_relpathbuf(ndp);
  921 
  922 out:
  923         NFSEXITCODE(error);
  924         return (error);
  925 }
  926 
  927 /*
  928  * symlink vnode op.
  929  */
  930 int
  931 nfsvno_symlink(struct nameidata *ndp, struct nfsvattr *nvap, char *pathcp,
  932     int pathlen, int not_v2, uid_t saved_uid, struct ucred *cred, struct thread *p,
  933     struct nfsexstuff *exp)
  934 {
  935         int error = 0;
  936 
  937         if (ndp->ni_vp) {
  938                 vrele(ndp->ni_startdir);
  939                 nfsvno_relpathbuf(ndp);
  940                 if (ndp->ni_dvp == ndp->ni_vp)
  941                         vrele(ndp->ni_dvp);
  942                 else
  943                         vput(ndp->ni_dvp);
  944                 vrele(ndp->ni_vp);
  945                 error = EEXIST;
  946                 goto out;
  947         }
  948 
  949         error = VOP_SYMLINK(ndp->ni_dvp, &ndp->ni_vp, &ndp->ni_cnd,
  950             &nvap->na_vattr, pathcp);
  951         vput(ndp->ni_dvp);
  952         vrele(ndp->ni_startdir);
  953         nfsvno_relpathbuf(ndp);
  954         /*
  955          * Although FreeBSD still had the lookup code in
  956          * it for 7/current, there doesn't seem to be any
  957          * point, since VOP_SYMLINK() returns the ni_vp.
  958          * Just vput it for v2.
  959          */
  960         if (!not_v2 && !error)
  961                 vput(ndp->ni_vp);
  962 
  963 out:
  964         NFSEXITCODE(error);
  965         return (error);
  966 }
  967 
  968 /*
  969  * Parse symbolic link arguments.
  970  * This function has an ugly side effect. It will MALLOC() an area for
  971  * the symlink and set iov_base to point to it, only if it succeeds.
  972  * So, if it returns with uiop->uio_iov->iov_base != NULL, that must
  973  * be FREE'd later.
  974  */
  975 int
  976 nfsvno_getsymlink(struct nfsrv_descript *nd, struct nfsvattr *nvap,
  977     struct thread *p, char **pathcpp, int *lenp)
  978 {
  979         u_int32_t *tl;
  980         char *pathcp = NULL;
  981         int error = 0, len;
  982         struct nfsv2_sattr *sp;
  983 
  984         *pathcpp = NULL;
  985         *lenp = 0;
  986         if ((nd->nd_flag & ND_NFSV3) &&
  987             (error = nfsrv_sattr(nd, nvap, NULL, NULL, p)))
  988                 goto nfsmout;
  989         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
  990         len = fxdr_unsigned(int, *tl);
  991         if (len > NFS_MAXPATHLEN || len <= 0) {
  992                 error = EBADRPC;
  993                 goto nfsmout;
  994         }
  995         MALLOC(pathcp, caddr_t, len + 1, M_TEMP, M_WAITOK);
  996         error = nfsrv_mtostr(nd, pathcp, len);
  997         if (error)
  998                 goto nfsmout;
  999         if (nd->nd_flag & ND_NFSV2) {
 1000                 NFSM_DISSECT(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
 1001                 nvap->na_mode = fxdr_unsigned(u_int16_t, sp->sa_mode);
 1002         }
 1003         *pathcpp = pathcp;
 1004         *lenp = len;
 1005         NFSEXITCODE2(0, nd);
 1006         return (0);
 1007 nfsmout:
 1008         if (pathcp)
 1009                 free(pathcp, M_TEMP);
 1010         NFSEXITCODE2(error, nd);
 1011         return (error);
 1012 }
 1013 
 1014 /*
 1015  * Remove a non-directory object.
 1016  */
 1017 int
 1018 nfsvno_removesub(struct nameidata *ndp, int is_v4, struct ucred *cred,
 1019     struct thread *p, struct nfsexstuff *exp)
 1020 {
 1021         struct vnode *vp;
 1022         int error = 0;
 1023 
 1024         vp = ndp->ni_vp;
 1025         if (vp->v_type == VDIR)
 1026                 error = NFSERR_ISDIR;
 1027         else if (is_v4)
 1028                 error = nfsrv_checkremove(vp, 1, p);
 1029         if (!error)
 1030                 error = VOP_REMOVE(ndp->ni_dvp, vp, &ndp->ni_cnd);
 1031         if (ndp->ni_dvp == vp)
 1032                 vrele(ndp->ni_dvp);
 1033         else
 1034                 vput(ndp->ni_dvp);
 1035         vput(vp);
 1036         NFSEXITCODE(error);
 1037         return (error);
 1038 }
 1039 
 1040 /*
 1041  * Remove a directory.
 1042  */
 1043 int
 1044 nfsvno_rmdirsub(struct nameidata *ndp, int is_v4, struct ucred *cred,
 1045     struct thread *p, struct nfsexstuff *exp)
 1046 {
 1047         struct vnode *vp;
 1048         int error = 0;
 1049 
 1050         vp = ndp->ni_vp;
 1051         if (vp->v_type != VDIR) {
 1052                 error = ENOTDIR;
 1053                 goto out;
 1054         }
 1055         /*
 1056          * No rmdir "." please.
 1057          */
 1058         if (ndp->ni_dvp == vp) {
 1059                 error = EINVAL;
 1060                 goto out;
 1061         }
 1062         /*
 1063          * The root of a mounted filesystem cannot be deleted.
 1064          */
 1065         if (vp->v_vflag & VV_ROOT)
 1066                 error = EBUSY;
 1067 out:
 1068         if (!error)
 1069                 error = VOP_RMDIR(ndp->ni_dvp, vp, &ndp->ni_cnd);
 1070         if (ndp->ni_dvp == vp)
 1071                 vrele(ndp->ni_dvp);
 1072         else
 1073                 vput(ndp->ni_dvp);
 1074         vput(vp);
 1075         NFSEXITCODE(error);
 1076         return (error);
 1077 }
 1078 
 1079 /*
 1080  * Rename vnode op.
 1081  */
 1082 int
 1083 nfsvno_rename(struct nameidata *fromndp, struct nameidata *tondp,
 1084     u_int32_t ndstat, u_int32_t ndflag, struct ucred *cred, struct thread *p)
 1085 {
 1086         struct vnode *fvp, *tvp, *tdvp;
 1087         int error = 0;
 1088 
 1089         fvp = fromndp->ni_vp;
 1090         if (ndstat) {
 1091                 vrele(fromndp->ni_dvp);
 1092                 vrele(fvp);
 1093                 error = ndstat;
 1094                 goto out1;
 1095         }
 1096         tdvp = tondp->ni_dvp;
 1097         tvp = tondp->ni_vp;
 1098         if (tvp != NULL) {
 1099                 if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
 1100                         error = (ndflag & ND_NFSV2) ? EISDIR : EEXIST;
 1101                         goto out;
 1102                 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
 1103                         error = (ndflag & ND_NFSV2) ? ENOTDIR : EEXIST;
 1104                         goto out;
 1105                 }
 1106                 if (tvp->v_type == VDIR && tvp->v_mountedhere) {
 1107                         error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
 1108                         goto out;
 1109                 }
 1110 
 1111                 /*
 1112                  * A rename to '.' or '..' results in a prematurely
 1113                  * unlocked vnode on FreeBSD5, so I'm just going to fail that
 1114                  * here.
 1115                  */
 1116                 if ((tondp->ni_cnd.cn_namelen == 1 &&
 1117                      tondp->ni_cnd.cn_nameptr[0] == '.') ||
 1118                     (tondp->ni_cnd.cn_namelen == 2 &&
 1119                      tondp->ni_cnd.cn_nameptr[0] == '.' &&
 1120                      tondp->ni_cnd.cn_nameptr[1] == '.')) {
 1121                         error = EINVAL;
 1122                         goto out;
 1123                 }
 1124         }
 1125         if (fvp->v_type == VDIR && fvp->v_mountedhere) {
 1126                 error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
 1127                 goto out;
 1128         }
 1129         if (fvp->v_mount != tdvp->v_mount) {
 1130                 error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
 1131                 goto out;
 1132         }
 1133         if (fvp == tdvp) {
 1134                 error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EINVAL;
 1135                 goto out;
 1136         }
 1137         if (fvp == tvp) {
 1138                 /*
 1139                  * If source and destination are the same, there is nothing to
 1140                  * do. Set error to -1 to indicate this.
 1141                  */
 1142                 error = -1;
 1143                 goto out;
 1144         }
 1145         if (ndflag & ND_NFSV4) {
 1146                 if (NFSVOPLOCK(fvp, LK_EXCLUSIVE) == 0) {
 1147                         error = nfsrv_checkremove(fvp, 0, p);
 1148                         NFSVOPUNLOCK(fvp, 0);
 1149                 } else
 1150                         error = EPERM;
 1151                 if (tvp && !error)
 1152                         error = nfsrv_checkremove(tvp, 1, p);
 1153         } else {
 1154                 /*
 1155                  * For NFSv2 and NFSv3, try to get rid of the delegation, so
 1156                  * that the NFSv4 client won't be confused by the rename.
 1157                  * Since nfsd_recalldelegation() can only be called on an
 1158                  * unlocked vnode at this point and fvp is the file that will
 1159                  * still exist after the rename, just do fvp.
 1160                  */
 1161                 nfsd_recalldelegation(fvp, p);
 1162         }
 1163 out:
 1164         if (!error) {
 1165                 error = VOP_RENAME(fromndp->ni_dvp, fromndp->ni_vp,
 1166                     &fromndp->ni_cnd, tondp->ni_dvp, tondp->ni_vp,
 1167                     &tondp->ni_cnd);
 1168         } else {
 1169                 if (tdvp == tvp)
 1170                         vrele(tdvp);
 1171                 else
 1172                         vput(tdvp);
 1173                 if (tvp)
 1174                         vput(tvp);
 1175                 vrele(fromndp->ni_dvp);
 1176                 vrele(fvp);
 1177                 if (error == -1)
 1178                         error = 0;
 1179         }
 1180         vrele(tondp->ni_startdir);
 1181         nfsvno_relpathbuf(tondp);
 1182 out1:
 1183         vrele(fromndp->ni_startdir);
 1184         nfsvno_relpathbuf(fromndp);
 1185         NFSEXITCODE(error);
 1186         return (error);
 1187 }
 1188 
 1189 /*
 1190  * Link vnode op.
 1191  */
 1192 int
 1193 nfsvno_link(struct nameidata *ndp, struct vnode *vp, struct ucred *cred,
 1194     struct thread *p, struct nfsexstuff *exp)
 1195 {
 1196         struct vnode *xp;
 1197         int error = 0;
 1198 
 1199         xp = ndp->ni_vp;
 1200         if (xp != NULL) {
 1201                 error = EEXIST;
 1202         } else {
 1203                 xp = ndp->ni_dvp;
 1204                 if (vp->v_mount != xp->v_mount)
 1205                         error = EXDEV;
 1206         }
 1207         if (!error) {
 1208                 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
 1209                 if ((vp->v_iflag & VI_DOOMED) == 0)
 1210                         error = VOP_LINK(ndp->ni_dvp, vp, &ndp->ni_cnd);
 1211                 else
 1212                         error = EPERM;
 1213                 if (ndp->ni_dvp == vp)
 1214                         vrele(ndp->ni_dvp);
 1215                 else
 1216                         vput(ndp->ni_dvp);
 1217                 NFSVOPUNLOCK(vp, 0);
 1218         } else {
 1219                 if (ndp->ni_dvp == ndp->ni_vp)
 1220                         vrele(ndp->ni_dvp);
 1221                 else
 1222                         vput(ndp->ni_dvp);
 1223                 if (ndp->ni_vp)
 1224                         vrele(ndp->ni_vp);
 1225         }
 1226         nfsvno_relpathbuf(ndp);
 1227         NFSEXITCODE(error);
 1228         return (error);
 1229 }
 1230 
 1231 /*
 1232  * Do the fsync() appropriate for the commit.
 1233  */
 1234 int
 1235 nfsvno_fsync(struct vnode *vp, u_int64_t off, int cnt, struct ucred *cred,
 1236     struct thread *td)
 1237 {
 1238         int error = 0;
 1239 
 1240         if (cnt > MAX_COMMIT_COUNT) {
 1241                 /*
 1242                  * Give up and do the whole thing
 1243                  */
 1244                 if (vp->v_object &&
 1245                    (vp->v_object->flags & OBJ_MIGHTBEDIRTY)) {
 1246                         VM_OBJECT_LOCK(vp->v_object);
 1247                         vm_object_page_clean(vp->v_object, 0, 0, OBJPC_SYNC);
 1248                         VM_OBJECT_UNLOCK(vp->v_object);
 1249                 }
 1250                 error = VOP_FSYNC(vp, MNT_WAIT, td);
 1251         } else {
 1252                 /*
 1253                  * Locate and synchronously write any buffers that fall
 1254                  * into the requested range.  Note:  we are assuming that
 1255                  * f_iosize is a power of 2.
 1256                  */
 1257                 int iosize = vp->v_mount->mnt_stat.f_iosize;
 1258                 int iomask = iosize - 1;
 1259                 struct bufobj *bo;
 1260                 daddr_t lblkno;
 1261 
 1262                 /*
 1263                  * Align to iosize boundry, super-align to page boundry.
 1264                  */
 1265                 if (off & iomask) {
 1266                         cnt += off & iomask;
 1267                         off &= ~(u_quad_t)iomask;
 1268                 }
 1269                 if (off & PAGE_MASK) {
 1270                         cnt += off & PAGE_MASK;
 1271                         off &= ~(u_quad_t)PAGE_MASK;
 1272                 }
 1273                 lblkno = off / iosize;
 1274 
 1275                 if (vp->v_object &&
 1276                    (vp->v_object->flags & OBJ_MIGHTBEDIRTY)) {
 1277                         VM_OBJECT_LOCK(vp->v_object);
 1278                         vm_object_page_clean(vp->v_object, off, off + cnt,
 1279                             OBJPC_SYNC);
 1280                         VM_OBJECT_UNLOCK(vp->v_object);
 1281                 }
 1282 
 1283                 bo = &vp->v_bufobj;
 1284                 BO_LOCK(bo);
 1285                 while (cnt > 0) {
 1286                         struct buf *bp;
 1287 
 1288                         /*
 1289                          * If we have a buffer and it is marked B_DELWRI we
 1290                          * have to lock and write it.  Otherwise the prior
 1291                          * write is assumed to have already been committed.
 1292                          *
 1293                          * gbincore() can return invalid buffers now so we
 1294                          * have to check that bit as well (though B_DELWRI
 1295                          * should not be set if B_INVAL is set there could be
 1296                          * a race here since we haven't locked the buffer).
 1297                          */
 1298                         if ((bp = gbincore(&vp->v_bufobj, lblkno)) != NULL) {
 1299                                 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_SLEEPFAIL |
 1300                                     LK_INTERLOCK, BO_MTX(bo)) == ENOLCK) {
 1301                                         BO_LOCK(bo);
 1302                                         continue; /* retry */
 1303                                 }
 1304                                 if ((bp->b_flags & (B_DELWRI|B_INVAL)) ==
 1305                                     B_DELWRI) {
 1306                                         bremfree(bp);
 1307                                         bp->b_flags &= ~B_ASYNC;
 1308                                         bwrite(bp);
 1309                                         ++nfs_commit_miss;
 1310                                 } else
 1311                                         BUF_UNLOCK(bp);
 1312                                 BO_LOCK(bo);
 1313                         }
 1314                         ++nfs_commit_blks;
 1315                         if (cnt < iosize)
 1316                                 break;
 1317                         cnt -= iosize;
 1318                         ++lblkno;
 1319                 }
 1320                 BO_UNLOCK(bo);
 1321         }
 1322         NFSEXITCODE(error);
 1323         return (error);
 1324 }
 1325 
 1326 /*
 1327  * Statfs vnode op.
 1328  */
 1329 int
 1330 nfsvno_statfs(struct vnode *vp, struct statfs *sf)
 1331 {
 1332         int error;
 1333 
 1334         error = VFS_STATFS(vp->v_mount, sf);
 1335         if (error == 0) {
 1336                 /*
 1337                  * Since NFS handles these values as unsigned on the
 1338                  * wire, there is no way to represent negative values,
 1339                  * so set them to 0. Without this, they will appear
 1340                  * to be very large positive values for clients like
 1341                  * Solaris10.
 1342                  */
 1343                 if (sf->f_bavail < 0)
 1344                         sf->f_bavail = 0;
 1345                 if (sf->f_ffree < 0)
 1346                         sf->f_ffree = 0;
 1347         }
 1348         NFSEXITCODE(error);
 1349         return (error);
 1350 }
 1351 
 1352 /*
 1353  * Do the vnode op stuff for Open. Similar to nfsvno_createsub(), but
 1354  * must handle nfsrv_opencheck() calls after any other access checks.
 1355  */
 1356 void
 1357 nfsvno_open(struct nfsrv_descript *nd, struct nameidata *ndp,
 1358     nfsquad_t clientid, nfsv4stateid_t *stateidp, struct nfsstate *stp,
 1359     int *exclusive_flagp, struct nfsvattr *nvap, int32_t *cverf, int create,
 1360     NFSACL_T *aclp, nfsattrbit_t *attrbitp, struct ucred *cred, struct thread *p,
 1361     struct nfsexstuff *exp, struct vnode **vpp)
 1362 {
 1363         struct vnode *vp = NULL;
 1364         u_quad_t tempsize;
 1365         struct nfsexstuff nes;
 1366 
 1367         if (ndp->ni_vp == NULL)
 1368                 nd->nd_repstat = nfsrv_opencheck(clientid,
 1369                     stateidp, stp, NULL, nd, p, nd->nd_repstat);
 1370         if (!nd->nd_repstat) {
 1371                 if (ndp->ni_vp == NULL) {
 1372                         vrele(ndp->ni_startdir);
 1373                         nd->nd_repstat = VOP_CREATE(ndp->ni_dvp,
 1374                             &ndp->ni_vp, &ndp->ni_cnd, &nvap->na_vattr);
 1375                         vput(ndp->ni_dvp);
 1376                         nfsvno_relpathbuf(ndp);
 1377                         if (!nd->nd_repstat) {
 1378                                 if (*exclusive_flagp) {
 1379                                         *exclusive_flagp = 0;
 1380                                         NFSVNO_ATTRINIT(nvap);
 1381                                         nvap->na_atime.tv_sec = cverf[0];
 1382                                         nvap->na_atime.tv_nsec = cverf[1];
 1383                                         nd->nd_repstat = VOP_SETATTR(ndp->ni_vp,
 1384                                             &nvap->na_vattr, cred);
 1385                                 } else {
 1386                                         nfsrv_fixattr(nd, ndp->ni_vp, nvap,
 1387                                             aclp, p, attrbitp, exp);
 1388                                 }
 1389                         }
 1390                         vp = ndp->ni_vp;
 1391                 } else {
 1392                         if (ndp->ni_startdir)
 1393                                 vrele(ndp->ni_startdir);
 1394                         nfsvno_relpathbuf(ndp);
 1395                         vp = ndp->ni_vp;
 1396                         if (create == NFSV4OPEN_CREATE) {
 1397                                 if (ndp->ni_dvp == vp)
 1398                                         vrele(ndp->ni_dvp);
 1399                                 else
 1400                                         vput(ndp->ni_dvp);
 1401                         }
 1402                         if (NFSVNO_ISSETSIZE(nvap) && vp->v_type == VREG) {
 1403                                 if (ndp->ni_cnd.cn_flags & RDONLY)
 1404                                         NFSVNO_SETEXRDONLY(&nes);
 1405                                 else
 1406                                         NFSVNO_EXINIT(&nes);
 1407                                 nd->nd_repstat = nfsvno_accchk(vp, 
 1408                                     VWRITE, cred, &nes, p,
 1409                                     NFSACCCHK_NOOVERRIDE,
 1410                                     NFSACCCHK_VPISLOCKED, NULL);
 1411                                 nd->nd_repstat = nfsrv_opencheck(clientid,
 1412                                     stateidp, stp, vp, nd, p, nd->nd_repstat);
 1413                                 if (!nd->nd_repstat) {
 1414                                         tempsize = nvap->na_size;
 1415                                         NFSVNO_ATTRINIT(nvap);
 1416                                         nvap->na_size = tempsize;
 1417                                         nd->nd_repstat = VOP_SETATTR(vp,
 1418                                             &nvap->na_vattr, cred);
 1419                                 }
 1420                         } else if (vp->v_type == VREG) {
 1421                                 nd->nd_repstat = nfsrv_opencheck(clientid,
 1422                                     stateidp, stp, vp, nd, p, nd->nd_repstat);
 1423                         }
 1424                 }
 1425         } else {
 1426                 if (ndp->ni_cnd.cn_flags & HASBUF)
 1427                         nfsvno_relpathbuf(ndp);
 1428                 if (ndp->ni_startdir && create == NFSV4OPEN_CREATE) {
 1429                         vrele(ndp->ni_startdir);
 1430                         if (ndp->ni_dvp == ndp->ni_vp)
 1431                                 vrele(ndp->ni_dvp);
 1432                         else
 1433                                 vput(ndp->ni_dvp);
 1434                         if (ndp->ni_vp)
 1435                                 vput(ndp->ni_vp);
 1436                 }
 1437         }
 1438         *vpp = vp;
 1439 
 1440         NFSEXITCODE2(0, nd);
 1441 }
 1442 
 1443 /*
 1444  * Updates the file rev and sets the mtime and ctime
 1445  * to the current clock time, returning the va_filerev and va_Xtime
 1446  * values.
 1447  */
 1448 void
 1449 nfsvno_updfilerev(struct vnode *vp, struct nfsvattr *nvap,
 1450     struct ucred *cred, struct thread *p)
 1451 {
 1452         struct vattr va;
 1453 
 1454         VATTR_NULL(&va);
 1455         getnanotime(&va.va_mtime);
 1456         (void) VOP_SETATTR(vp, &va, cred);
 1457         (void) nfsvno_getattr(vp, nvap, cred, p, 1);
 1458 }
 1459 
 1460 /*
 1461  * Glue routine to nfsv4_fillattr().
 1462  */
 1463 int
 1464 nfsvno_fillattr(struct nfsrv_descript *nd, struct mount *mp, struct vnode *vp,
 1465     struct nfsvattr *nvap, fhandle_t *fhp, int rderror, nfsattrbit_t *attrbitp,
 1466     struct ucred *cred, struct thread *p, int isdgram, int reterr,
 1467     int supports_nfsv4acls, int at_root, uint64_t mounted_on_fileno)
 1468 {
 1469         int error;
 1470 
 1471         error = nfsv4_fillattr(nd, mp, vp, NULL, &nvap->na_vattr, fhp, rderror,
 1472             attrbitp, cred, p, isdgram, reterr, supports_nfsv4acls, at_root,
 1473             mounted_on_fileno);
 1474         NFSEXITCODE2(0, nd);
 1475         return (error);
 1476 }
 1477 
 1478 /* Since the Readdir vnode ops vary, put the entire functions in here. */
 1479 /*
 1480  * nfs readdir service
 1481  * - mallocs what it thinks is enough to read
 1482  *      count rounded up to a multiple of DIRBLKSIZ <= NFS_MAXREADDIR
 1483  * - calls VOP_READDIR()
 1484  * - loops around building the reply
 1485  *      if the output generated exceeds count break out of loop
 1486  *      The NFSM_CLGET macro is used here so that the reply will be packed
 1487  *      tightly in mbuf clusters.
 1488  * - it trims out records with d_fileno == 0
 1489  *      this doesn't matter for Unix clients, but they might confuse clients
 1490  *      for other os'.
 1491  * - it trims out records with d_type == DT_WHT
 1492  *      these cannot be seen through NFS (unless we extend the protocol)
 1493  *     The alternate call nfsrvd_readdirplus() does lookups as well.
 1494  * PS: The NFS protocol spec. does not clarify what the "count" byte
 1495  *      argument is a count of.. just name strings and file id's or the
 1496  *      entire reply rpc or ...
 1497  *      I tried just file name and id sizes and it confused the Sun client,
 1498  *      so I am using the full rpc size now. The "paranoia.." comment refers
 1499  *      to including the status longwords that are not a part of the dir.
 1500  *      "entry" structures, but are in the rpc.
 1501  */
 1502 int
 1503 nfsrvd_readdir(struct nfsrv_descript *nd, int isdgram,
 1504     struct vnode *vp, struct thread *p, struct nfsexstuff *exp)
 1505 {
 1506         struct dirent *dp;
 1507         u_int32_t *tl;
 1508         int dirlen;
 1509         char *cpos, *cend, *rbuf;
 1510         struct nfsvattr at;
 1511         int nlen, error = 0, getret = 1;
 1512         int siz, cnt, fullsiz, eofflag, ncookies;
 1513         u_int64_t off, toff, verf;
 1514         u_long *cookies = NULL, *cookiep;
 1515         struct uio io;
 1516         struct iovec iv;
 1517         int not_zfs;
 1518 
 1519         if (nd->nd_repstat) {
 1520                 nfsrv_postopattr(nd, getret, &at);
 1521                 goto out;
 1522         }
 1523         if (nd->nd_flag & ND_NFSV2) {
 1524                 NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 1525                 off = fxdr_unsigned(u_quad_t, *tl++);
 1526         } else {
 1527                 NFSM_DISSECT(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
 1528                 off = fxdr_hyper(tl);
 1529                 tl += 2;
 1530                 verf = fxdr_hyper(tl);
 1531                 tl += 2;
 1532         }
 1533         toff = off;
 1534         cnt = fxdr_unsigned(int, *tl);
 1535         if (cnt > NFS_SRVMAXDATA(nd) || cnt < 0)
 1536                 cnt = NFS_SRVMAXDATA(nd);
 1537         siz = ((cnt + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1));
 1538         fullsiz = siz;
 1539         if (nd->nd_flag & ND_NFSV3) {
 1540                 nd->nd_repstat = getret = nfsvno_getattr(vp, &at, nd->nd_cred,
 1541                     p, 1);
 1542 #if 0
 1543                 /*
 1544                  * va_filerev is not sufficient as a cookie verifier,
 1545                  * since it is not supposed to change when entries are
 1546                  * removed/added unless that offset cookies returned to
 1547                  * the client are no longer valid.
 1548                  */
 1549                 if (!nd->nd_repstat && toff && verf != at.na_filerev)
 1550                         nd->nd_repstat = NFSERR_BAD_COOKIE;
 1551 #endif
 1552         }
 1553         if (nd->nd_repstat == 0 && cnt == 0) {
 1554                 if (nd->nd_flag & ND_NFSV2)
 1555                         /* NFSv2 does not have NFSERR_TOOSMALL */
 1556                         nd->nd_repstat = EPERM;
 1557                 else
 1558                         nd->nd_repstat = NFSERR_TOOSMALL;
 1559         }
 1560         if (!nd->nd_repstat)
 1561                 nd->nd_repstat = nfsvno_accchk(vp, VEXEC,
 1562                     nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
 1563                     NFSACCCHK_VPISLOCKED, NULL);
 1564         if (nd->nd_repstat) {
 1565                 vput(vp);
 1566                 if (nd->nd_flag & ND_NFSV3)
 1567                         nfsrv_postopattr(nd, getret, &at);
 1568                 goto out;
 1569         }
 1570         not_zfs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "zfs");
 1571         MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
 1572 again:
 1573         eofflag = 0;
 1574         if (cookies) {
 1575                 free((caddr_t)cookies, M_TEMP);
 1576                 cookies = NULL;
 1577         }
 1578 
 1579         iv.iov_base = rbuf;
 1580         iv.iov_len = siz;
 1581         io.uio_iov = &iv;
 1582         io.uio_iovcnt = 1;
 1583         io.uio_offset = (off_t)off;
 1584         io.uio_resid = siz;
 1585         io.uio_segflg = UIO_SYSSPACE;
 1586         io.uio_rw = UIO_READ;
 1587         io.uio_td = NULL;
 1588         nd->nd_repstat = VOP_READDIR(vp, &io, nd->nd_cred, &eofflag, &ncookies,
 1589             &cookies);
 1590         off = (u_int64_t)io.uio_offset;
 1591         if (io.uio_resid)
 1592                 siz -= io.uio_resid;
 1593 
 1594         if (!cookies && !nd->nd_repstat)
 1595                 nd->nd_repstat = NFSERR_PERM;
 1596         if (nd->nd_flag & ND_NFSV3) {
 1597                 getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
 1598                 if (!nd->nd_repstat)
 1599                         nd->nd_repstat = getret;
 1600         }
 1601 
 1602         /*
 1603          * Handles the failed cases. nd->nd_repstat == 0 past here.
 1604          */
 1605         if (nd->nd_repstat) {
 1606                 vput(vp);
 1607                 free((caddr_t)rbuf, M_TEMP);
 1608                 if (cookies)
 1609                         free((caddr_t)cookies, M_TEMP);
 1610                 if (nd->nd_flag & ND_NFSV3)
 1611                         nfsrv_postopattr(nd, getret, &at);
 1612                 goto out;
 1613         }
 1614         /*
 1615          * If nothing read, return eof
 1616          * rpc reply
 1617          */
 1618         if (siz == 0) {
 1619                 vput(vp);
 1620                 if (nd->nd_flag & ND_NFSV2) {
 1621                         NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 1622                 } else {
 1623                         nfsrv_postopattr(nd, getret, &at);
 1624                         NFSM_BUILD(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
 1625                         txdr_hyper(at.na_filerev, tl);
 1626                         tl += 2;
 1627                 }
 1628                 *tl++ = newnfs_false;
 1629                 *tl = newnfs_true;
 1630                 FREE((caddr_t)rbuf, M_TEMP);
 1631                 FREE((caddr_t)cookies, M_TEMP);
 1632                 goto out;
 1633         }
 1634 
 1635         /*
 1636          * Check for degenerate cases of nothing useful read.
 1637          * If so go try again
 1638          */
 1639         cpos = rbuf;
 1640         cend = rbuf + siz;
 1641         dp = (struct dirent *)cpos;
 1642         cookiep = cookies;
 1643 
 1644         /*
 1645          * For some reason FreeBSD's ufs_readdir() chooses to back the
 1646          * directory offset up to a block boundary, so it is necessary to
 1647          * skip over the records that precede the requested offset. This
 1648          * requires the assumption that file offset cookies monotonically
 1649          * increase.
 1650          * Since the offset cookies don't monotonically increase for ZFS,
 1651          * this is not done when ZFS is the file system.
 1652          */
 1653         while (cpos < cend && ncookies > 0 &&
 1654             (dp->d_fileno == 0 || dp->d_type == DT_WHT ||
 1655              (not_zfs != 0 && ((u_quad_t)(*cookiep)) <= toff))) {
 1656                 cpos += dp->d_reclen;
 1657                 dp = (struct dirent *)cpos;
 1658                 cookiep++;
 1659                 ncookies--;
 1660         }
 1661         if (cpos >= cend || ncookies == 0) {
 1662                 siz = fullsiz;
 1663                 toff = off;
 1664                 goto again;
 1665         }
 1666         vput(vp);
 1667 
 1668         /*
 1669          * dirlen is the size of the reply, including all XDR and must
 1670          * not exceed cnt. For NFSv2, RFC1094 didn't clearly indicate
 1671          * if the XDR should be included in "count", but to be safe, we do.
 1672          * (Include the two booleans at the end of the reply in dirlen now.)
 1673          */
 1674         if (nd->nd_flag & ND_NFSV3) {
 1675                 nfsrv_postopattr(nd, getret, &at);
 1676                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 1677                 txdr_hyper(at.na_filerev, tl);
 1678                 dirlen = NFSX_V3POSTOPATTR + NFSX_VERF + 2 * NFSX_UNSIGNED;
 1679         } else {
 1680                 dirlen = 2 * NFSX_UNSIGNED;
 1681         }
 1682 
 1683         /* Loop through the records and build reply */
 1684         while (cpos < cend && ncookies > 0) {
 1685                 nlen = dp->d_namlen;
 1686                 if (dp->d_fileno != 0 && dp->d_type != DT_WHT &&
 1687                         nlen <= NFS_MAXNAMLEN) {
 1688                         if (nd->nd_flag & ND_NFSV3)
 1689                                 dirlen += (6*NFSX_UNSIGNED + NFSM_RNDUP(nlen));
 1690                         else
 1691                                 dirlen += (4*NFSX_UNSIGNED + NFSM_RNDUP(nlen));
 1692                         if (dirlen > cnt) {
 1693                                 eofflag = 0;
 1694                                 break;
 1695                         }
 1696 
 1697                         /*
 1698                          * Build the directory record xdr from
 1699                          * the dirent entry.
 1700                          */
 1701                         if (nd->nd_flag & ND_NFSV3) {
 1702                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
 1703                                 *tl++ = newnfs_true;
 1704                                 *tl++ = 0;
 1705                         } else {
 1706                                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 1707                                 *tl++ = newnfs_true;
 1708                         }
 1709                         *tl = txdr_unsigned(dp->d_fileno);
 1710                         (void) nfsm_strtom(nd, dp->d_name, nlen);
 1711                         if (nd->nd_flag & ND_NFSV3) {
 1712                                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 1713                                 *tl++ = 0;
 1714                         } else
 1715                                 NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
 1716                         *tl = txdr_unsigned(*cookiep);
 1717                 }
 1718                 cpos += dp->d_reclen;
 1719                 dp = (struct dirent *)cpos;
 1720                 cookiep++;
 1721                 ncookies--;
 1722         }
 1723         if (cpos < cend)
 1724                 eofflag = 0;
 1725         NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 1726         *tl++ = newnfs_false;
 1727         if (eofflag)
 1728                 *tl = newnfs_true;
 1729         else
 1730                 *tl = newnfs_false;
 1731         FREE((caddr_t)rbuf, M_TEMP);
 1732         FREE((caddr_t)cookies, M_TEMP);
 1733 
 1734 out:
 1735         NFSEXITCODE2(0, nd);
 1736         return (0);
 1737 nfsmout:
 1738         vput(vp);
 1739         NFSEXITCODE2(error, nd);
 1740         return (error);
 1741 }
 1742 
 1743 /*
 1744  * Readdirplus for V3 and Readdir for V4.
 1745  */
 1746 int
 1747 nfsrvd_readdirplus(struct nfsrv_descript *nd, int isdgram,
 1748     struct vnode *vp, struct thread *p, struct nfsexstuff *exp)
 1749 {
 1750         struct dirent *dp;
 1751         u_int32_t *tl;
 1752         int dirlen;
 1753         char *cpos, *cend, *rbuf;
 1754         struct vnode *nvp;
 1755         fhandle_t nfh;
 1756         struct nfsvattr nva, at, *nvap = &nva;
 1757         struct mbuf *mb0, *mb1;
 1758         struct nfsreferral *refp;
 1759         int nlen, r, error = 0, getret = 1, usevget = 1;
 1760         int siz, cnt, fullsiz, eofflag, ncookies, entrycnt;
 1761         caddr_t bpos0, bpos1;
 1762         u_int64_t off, toff, verf;
 1763         u_long *cookies = NULL, *cookiep;
 1764         nfsattrbit_t attrbits, rderrbits, savbits;
 1765         struct uio io;
 1766         struct iovec iv;
 1767         struct componentname cn;
 1768         int at_root, needs_unbusy, not_zfs, supports_nfsv4acls;
 1769         struct mount *mp, *new_mp;
 1770         uint64_t mounted_on_fileno;
 1771 
 1772         if (nd->nd_repstat) {
 1773                 nfsrv_postopattr(nd, getret, &at);
 1774                 goto out;
 1775         }
 1776         NFSM_DISSECT(tl, u_int32_t *, 6 * NFSX_UNSIGNED);
 1777         off = fxdr_hyper(tl);
 1778         toff = off;
 1779         tl += 2;
 1780         verf = fxdr_hyper(tl);
 1781         tl += 2;
 1782         siz = fxdr_unsigned(int, *tl++);
 1783         cnt = fxdr_unsigned(int, *tl);
 1784 
 1785         /*
 1786          * Use the server's maximum data transfer size as the upper bound
 1787          * on reply datalen.
 1788          */
 1789         if (cnt > NFS_SRVMAXDATA(nd) || cnt < 0)
 1790                 cnt = NFS_SRVMAXDATA(nd);
 1791 
 1792         /*
 1793          * siz is a "hint" of how much directory information (name, fileid,
 1794          * cookie) should be in the reply. At least one client "hints" 0,
 1795          * so I set it to cnt for that case. I also round it up to the
 1796          * next multiple of DIRBLKSIZ.
 1797          */
 1798         if (siz <= 0)
 1799                 siz = cnt;
 1800         siz = ((siz + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1));
 1801 
 1802         if (nd->nd_flag & ND_NFSV4) {
 1803                 error = nfsrv_getattrbits(nd, &attrbits, NULL, NULL);
 1804                 if (error)
 1805                         goto nfsmout;
 1806                 NFSSET_ATTRBIT(&savbits, &attrbits);
 1807                 NFSCLRNOTFILLABLE_ATTRBIT(&attrbits);
 1808                 NFSZERO_ATTRBIT(&rderrbits);
 1809                 NFSSETBIT_ATTRBIT(&rderrbits, NFSATTRBIT_RDATTRERROR);
 1810         } else {
 1811                 NFSZERO_ATTRBIT(&attrbits);
 1812         }
 1813         fullsiz = siz;
 1814         nd->nd_repstat = getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
 1815         if (!nd->nd_repstat) {
 1816             if (off && verf != at.na_filerev) {
 1817                 /*
 1818                  * va_filerev is not sufficient as a cookie verifier,
 1819                  * since it is not supposed to change when entries are
 1820                  * removed/added unless that offset cookies returned to
 1821                  * the client are no longer valid.
 1822                  */
 1823 #if 0
 1824                 if (nd->nd_flag & ND_NFSV4) {
 1825                         nd->nd_repstat = NFSERR_NOTSAME;
 1826                 } else {
 1827                         nd->nd_repstat = NFSERR_BAD_COOKIE;
 1828                 }
 1829 #endif
 1830             } else if ((nd->nd_flag & ND_NFSV4) && off == 0 && verf != 0) {
 1831                 nd->nd_repstat = NFSERR_BAD_COOKIE;
 1832             }
 1833         }
 1834         if (!nd->nd_repstat && vp->v_type != VDIR)
 1835                 nd->nd_repstat = NFSERR_NOTDIR;
 1836         if (!nd->nd_repstat && cnt == 0)
 1837                 nd->nd_repstat = NFSERR_TOOSMALL;
 1838         if (!nd->nd_repstat)
 1839                 nd->nd_repstat = nfsvno_accchk(vp, VEXEC,
 1840                     nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
 1841                     NFSACCCHK_VPISLOCKED, NULL);
 1842         if (nd->nd_repstat) {
 1843                 vput(vp);
 1844                 if (nd->nd_flag & ND_NFSV3)
 1845                         nfsrv_postopattr(nd, getret, &at);
 1846                 goto out;
 1847         }
 1848         not_zfs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "zfs");
 1849 
 1850         MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
 1851 again:
 1852         eofflag = 0;
 1853         if (cookies) {
 1854                 free((caddr_t)cookies, M_TEMP);
 1855                 cookies = NULL;
 1856         }
 1857 
 1858         iv.iov_base = rbuf;
 1859         iv.iov_len = siz;
 1860         io.uio_iov = &iv;
 1861         io.uio_iovcnt = 1;
 1862         io.uio_offset = (off_t)off;
 1863         io.uio_resid = siz;
 1864         io.uio_segflg = UIO_SYSSPACE;
 1865         io.uio_rw = UIO_READ;
 1866         io.uio_td = NULL;
 1867         nd->nd_repstat = VOP_READDIR(vp, &io, nd->nd_cred, &eofflag, &ncookies,
 1868             &cookies);
 1869         off = (u_int64_t)io.uio_offset;
 1870         if (io.uio_resid)
 1871                 siz -= io.uio_resid;
 1872 
 1873         getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
 1874 
 1875         if (!cookies && !nd->nd_repstat)
 1876                 nd->nd_repstat = NFSERR_PERM;
 1877         if (!nd->nd_repstat)
 1878                 nd->nd_repstat = getret;
 1879         if (nd->nd_repstat) {
 1880                 vput(vp);
 1881                 if (cookies)
 1882                         free((caddr_t)cookies, M_TEMP);
 1883                 free((caddr_t)rbuf, M_TEMP);
 1884                 if (nd->nd_flag & ND_NFSV3)
 1885                         nfsrv_postopattr(nd, getret, &at);
 1886                 goto out;
 1887         }
 1888         /*
 1889          * If nothing read, return eof
 1890          * rpc reply
 1891          */
 1892         if (siz == 0) {
 1893                 vput(vp);
 1894                 if (nd->nd_flag & ND_NFSV3)
 1895                         nfsrv_postopattr(nd, getret, &at);
 1896                 NFSM_BUILD(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
 1897                 txdr_hyper(at.na_filerev, tl);
 1898                 tl += 2;
 1899                 *tl++ = newnfs_false;
 1900                 *tl = newnfs_true;
 1901                 free((caddr_t)cookies, M_TEMP);
 1902                 free((caddr_t)rbuf, M_TEMP);
 1903                 goto out;
 1904         }
 1905 
 1906         /*
 1907          * Check for degenerate cases of nothing useful read.
 1908          * If so go try again
 1909          */
 1910         cpos = rbuf;
 1911         cend = rbuf + siz;
 1912         dp = (struct dirent *)cpos;
 1913         cookiep = cookies;
 1914 
 1915         /*
 1916          * For some reason FreeBSD's ufs_readdir() chooses to back the
 1917          * directory offset up to a block boundary, so it is necessary to
 1918          * skip over the records that precede the requested offset. This
 1919          * requires the assumption that file offset cookies monotonically
 1920          * increase.
 1921          * Since the offset cookies don't monotonically increase for ZFS,
 1922          * this is not done when ZFS is the file system.
 1923          */
 1924         while (cpos < cend && ncookies > 0 &&
 1925           (dp->d_fileno == 0 || dp->d_type == DT_WHT ||
 1926            (not_zfs != 0 && ((u_quad_t)(*cookiep)) <= toff) ||
 1927            ((nd->nd_flag & ND_NFSV4) &&
 1928             ((dp->d_namlen == 1 && dp->d_name[0] == '.') ||
 1929              (dp->d_namlen==2 && dp->d_name[0]=='.' && dp->d_name[1]=='.'))))) {
 1930                 cpos += dp->d_reclen;
 1931                 dp = (struct dirent *)cpos;
 1932                 cookiep++;
 1933                 ncookies--;
 1934         }
 1935         if (cpos >= cend || ncookies == 0) {
 1936                 siz = fullsiz;
 1937                 toff = off;
 1938                 goto again;
 1939         }
 1940 
 1941         /*
 1942          * Busy the file system so that the mount point won't go away
 1943          * and, as such, VFS_VGET() can be used safely.
 1944          */
 1945         mp = vp->v_mount;
 1946         vfs_ref(mp);
 1947         NFSVOPUNLOCK(vp, 0);
 1948         nd->nd_repstat = vfs_busy(mp, 0);
 1949         vfs_rel(mp);
 1950         if (nd->nd_repstat != 0) {
 1951                 vrele(vp);
 1952                 free(cookies, M_TEMP);
 1953                 free(rbuf, M_TEMP);
 1954                 if (nd->nd_flag & ND_NFSV3)
 1955                         nfsrv_postopattr(nd, getret, &at);
 1956                 goto out;
 1957         }
 1958 
 1959         /*
 1960          * Save this position, in case there is an error before one entry
 1961          * is created.
 1962          */
 1963         mb0 = nd->nd_mb;
 1964         bpos0 = nd->nd_bpos;
 1965 
 1966         /*
 1967          * Fill in the first part of the reply.
 1968          * dirlen is the reply length in bytes and cannot exceed cnt.
 1969          * (Include the two booleans at the end of the reply in dirlen now,
 1970          *  so we recognize when we have exceeded cnt.)
 1971          */
 1972         if (nd->nd_flag & ND_NFSV3) {
 1973                 dirlen = NFSX_V3POSTOPATTR + NFSX_VERF + 2 * NFSX_UNSIGNED;
 1974                 nfsrv_postopattr(nd, getret, &at);
 1975         } else {
 1976                 dirlen = NFSX_VERF + 2 * NFSX_UNSIGNED;
 1977         }
 1978         NFSM_BUILD(tl, u_int32_t *, NFSX_VERF);
 1979         txdr_hyper(at.na_filerev, tl);
 1980 
 1981         /*
 1982          * Save this position, in case there is an empty reply needed.
 1983          */
 1984         mb1 = nd->nd_mb;
 1985         bpos1 = nd->nd_bpos;
 1986 
 1987         /* Loop through the records and build reply */
 1988         entrycnt = 0;
 1989         while (cpos < cend && ncookies > 0 && dirlen < cnt) {
 1990                 nlen = dp->d_namlen;
 1991                 if (dp->d_fileno != 0 && dp->d_type != DT_WHT &&
 1992                     nlen <= NFS_MAXNAMLEN &&
 1993                     ((nd->nd_flag & ND_NFSV3) || nlen > 2 ||
 1994                      (nlen==2 && (dp->d_name[0]!='.' || dp->d_name[1]!='.'))
 1995                       || (nlen == 1 && dp->d_name[0] != '.'))) {
 1996                         /*
 1997                          * Save the current position in the reply, in case
 1998                          * this entry exceeds cnt.
 1999                          */
 2000                         mb1 = nd->nd_mb;
 2001                         bpos1 = nd->nd_bpos;
 2002         
 2003                         /*
 2004                          * For readdir_and_lookup get the vnode using
 2005                          * the file number.
 2006                          */
 2007                         nvp = NULL;
 2008                         refp = NULL;
 2009                         r = 0;
 2010                         at_root = 0;
 2011                         needs_unbusy = 0;
 2012                         new_mp = mp;
 2013                         mounted_on_fileno = (uint64_t)dp->d_fileno;
 2014                         if ((nd->nd_flag & ND_NFSV3) ||
 2015                             NFSNONZERO_ATTRBIT(&savbits)) {
 2016                                 if (nd->nd_flag & ND_NFSV4)
 2017                                         refp = nfsv4root_getreferral(NULL,
 2018                                             vp, dp->d_fileno);
 2019                                 if (refp == NULL) {
 2020                                         if (usevget)
 2021                                                 r = VFS_VGET(mp, dp->d_fileno,
 2022                                                     LK_SHARED, &nvp);
 2023                                         else
 2024                                                 r = EOPNOTSUPP;
 2025                                         if (r == EOPNOTSUPP) {
 2026                                                 if (usevget) {
 2027                                                         usevget = 0;
 2028                                                         cn.cn_nameiop = LOOKUP;
 2029                                                         cn.cn_lkflags =
 2030                                                             LK_SHARED |
 2031                                                             LK_RETRY;
 2032                                                         cn.cn_cred =
 2033                                                             nd->nd_cred;
 2034                                                         cn.cn_thread = p;
 2035                                                 }
 2036                                                 cn.cn_nameptr = dp->d_name;
 2037                                                 cn.cn_namelen = nlen;
 2038                                                 cn.cn_flags = ISLASTCN |
 2039                                                     NOFOLLOW | LOCKLEAF |
 2040                                                     MPSAFE;
 2041                                                 if (nlen == 2 &&
 2042                                                     dp->d_name[0] == '.' &&
 2043                                                     dp->d_name[1] == '.')
 2044                                                         cn.cn_flags |=
 2045                                                             ISDOTDOT;
 2046                                                 if (NFSVOPLOCK(vp, LK_SHARED)
 2047                                                     != 0) {
 2048                                                         nd->nd_repstat = EPERM;
 2049                                                         break;
 2050                                                 }
 2051                                                 if ((vp->v_vflag & VV_ROOT) != 0
 2052                                                     && (cn.cn_flags & ISDOTDOT)
 2053                                                     != 0) {
 2054                                                         vref(vp);
 2055                                                         nvp = vp;
 2056                                                         r = 0;
 2057                                                 } else {
 2058                                                         r = VOP_LOOKUP(vp, &nvp,
 2059                                                             &cn);
 2060                                                         if (vp != nvp)
 2061                                                                 NFSVOPUNLOCK(vp,
 2062                                                                     0);
 2063                                                 }
 2064                                         }
 2065 
 2066                                         /*
 2067                                          * For NFSv4, check to see if nvp is
 2068                                          * a mount point and get the mount
 2069                                          * point vnode, as required.
 2070                                          */
 2071                                         if (r == 0 &&
 2072                                             nfsrv_enable_crossmntpt != 0 &&
 2073                                             (nd->nd_flag & ND_NFSV4) != 0 &&
 2074                                             nvp->v_type == VDIR &&
 2075                                             nvp->v_mountedhere != NULL) {
 2076                                                 new_mp = nvp->v_mountedhere;
 2077                                                 r = vfs_busy(new_mp, 0);
 2078                                                 vput(nvp);
 2079                                                 nvp = NULL;
 2080                                                 if (r == 0) {
 2081                                                         r = VFS_ROOT(new_mp,
 2082                                                             LK_SHARED, &nvp);
 2083                                                         needs_unbusy = 1;
 2084                                                         if (r == 0)
 2085                                                                 at_root = 1;
 2086                                                 }
 2087                                         }
 2088                                 }
 2089                                 if (!r) {
 2090                                     if (refp == NULL &&
 2091                                         ((nd->nd_flag & ND_NFSV3) ||
 2092                                          NFSNONZERO_ATTRBIT(&attrbits))) {
 2093                                         r = nfsvno_getfh(nvp, &nfh, p);
 2094                                         if (!r)
 2095                                             r = nfsvno_getattr(nvp, nvap,
 2096                                                 nd->nd_cred, p, 1);
 2097                                     }
 2098                                 } else {
 2099                                     nvp = NULL;
 2100                                 }
 2101                                 if (r) {
 2102                                         if (!NFSISSET_ATTRBIT(&attrbits,
 2103                                             NFSATTRBIT_RDATTRERROR)) {
 2104                                                 if (nvp != NULL)
 2105                                                         vput(nvp);
 2106                                                 if (needs_unbusy != 0)
 2107                                                         vfs_unbusy(new_mp);
 2108                                                 nd->nd_repstat = r;
 2109                                                 break;
 2110                                         }
 2111                                 }
 2112                         }
 2113 
 2114                         /*
 2115                          * Build the directory record xdr
 2116                          */
 2117                         if (nd->nd_flag & ND_NFSV3) {
 2118                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
 2119                                 *tl++ = newnfs_true;
 2120                                 *tl++ = 0;
 2121                                 *tl = txdr_unsigned(dp->d_fileno);
 2122                                 dirlen += nfsm_strtom(nd, dp->d_name, nlen);
 2123                                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 2124                                 *tl++ = 0;
 2125                                 *tl = txdr_unsigned(*cookiep);
 2126                                 nfsrv_postopattr(nd, 0, nvap);
 2127                                 dirlen += nfsm_fhtom(nd,(u_int8_t *)&nfh,0,1);
 2128                                 dirlen += (5*NFSX_UNSIGNED+NFSX_V3POSTOPATTR);
 2129                                 if (nvp != NULL)
 2130                                         vput(nvp);
 2131                         } else {
 2132                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
 2133                                 *tl++ = newnfs_true;
 2134                                 *tl++ = 0;
 2135                                 *tl = txdr_unsigned(*cookiep);
 2136                                 dirlen += nfsm_strtom(nd, dp->d_name, nlen);
 2137                                 if (nvp != NULL) {
 2138                                         supports_nfsv4acls =
 2139                                             nfs_supportsnfsv4acls(nvp);
 2140                                         NFSVOPUNLOCK(nvp, 0);
 2141                                 } else
 2142                                         supports_nfsv4acls = 0;
 2143                                 if (refp != NULL) {
 2144                                         dirlen += nfsrv_putreferralattr(nd,
 2145                                             &savbits, refp, 0,
 2146                                             &nd->nd_repstat);
 2147                                         if (nd->nd_repstat) {
 2148                                                 if (nvp != NULL)
 2149                                                         vrele(nvp);
 2150                                                 if (needs_unbusy != 0)
 2151                                                         vfs_unbusy(new_mp);
 2152                                                 break;
 2153                                         }
 2154                                 } else if (r) {
 2155                                         dirlen += nfsvno_fillattr(nd, new_mp,
 2156                                             nvp, nvap, &nfh, r, &rderrbits,
 2157                                             nd->nd_cred, p, isdgram, 0,
 2158                                             supports_nfsv4acls, at_root,
 2159                                             mounted_on_fileno);
 2160                                 } else {
 2161                                         dirlen += nfsvno_fillattr(nd, new_mp,
 2162                                             nvp, nvap, &nfh, r, &attrbits,
 2163                                             nd->nd_cred, p, isdgram, 0,
 2164                                             supports_nfsv4acls, at_root,
 2165                                             mounted_on_fileno);
 2166                                 }
 2167                                 if (nvp != NULL)
 2168                                         vrele(nvp);
 2169                                 dirlen += (3 * NFSX_UNSIGNED);
 2170                         }
 2171                         if (needs_unbusy != 0)
 2172                                 vfs_unbusy(new_mp);
 2173                         if (dirlen <= cnt)
 2174                                 entrycnt++;
 2175                 }
 2176                 cpos += dp->d_reclen;
 2177                 dp = (struct dirent *)cpos;
 2178                 cookiep++;
 2179                 ncookies--;
 2180         }
 2181         vrele(vp);
 2182         vfs_unbusy(mp);
 2183 
 2184         /*
 2185          * If dirlen > cnt, we must strip off the last entry. If that
 2186          * results in an empty reply, report NFSERR_TOOSMALL.
 2187          */
 2188         if (dirlen > cnt || nd->nd_repstat) {
 2189                 if (!nd->nd_repstat && entrycnt == 0)
 2190                         nd->nd_repstat = NFSERR_TOOSMALL;
 2191                 if (nd->nd_repstat)
 2192                         newnfs_trimtrailing(nd, mb0, bpos0);
 2193                 else
 2194                         newnfs_trimtrailing(nd, mb1, bpos1);
 2195                 eofflag = 0;
 2196         } else if (cpos < cend)
 2197                 eofflag = 0;
 2198         if (!nd->nd_repstat) {
 2199                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 2200                 *tl++ = newnfs_false;
 2201                 if (eofflag)
 2202                         *tl = newnfs_true;
 2203                 else
 2204                         *tl = newnfs_false;
 2205         }
 2206         FREE((caddr_t)cookies, M_TEMP);
 2207         FREE((caddr_t)rbuf, M_TEMP);
 2208 
 2209 out:
 2210         NFSEXITCODE2(0, nd);
 2211         return (0);
 2212 nfsmout:
 2213         vput(vp);
 2214         NFSEXITCODE2(error, nd);
 2215         return (error);
 2216 }
 2217 
 2218 /*
 2219  * Get the settable attributes out of the mbuf list.
 2220  * (Return 0 or EBADRPC)
 2221  */
 2222 int
 2223 nfsrv_sattr(struct nfsrv_descript *nd, struct nfsvattr *nvap,
 2224     nfsattrbit_t *attrbitp, NFSACL_T *aclp, struct thread *p)
 2225 {
 2226         u_int32_t *tl;
 2227         struct nfsv2_sattr *sp;
 2228         struct timeval curtime;
 2229         int error = 0, toclient = 0;
 2230 
 2231         switch (nd->nd_flag & (ND_NFSV2 | ND_NFSV3 | ND_NFSV4)) {
 2232         case ND_NFSV2:
 2233                 NFSM_DISSECT(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
 2234                 /*
 2235                  * Some old clients didn't fill in the high order 16bits.
 2236                  * --> check the low order 2 bytes for 0xffff
 2237                  */
 2238                 if ((fxdr_unsigned(int, sp->sa_mode) & 0xffff) != 0xffff)
 2239                         nvap->na_mode = nfstov_mode(sp->sa_mode);
 2240                 if (sp->sa_uid != newnfs_xdrneg1)
 2241                         nvap->na_uid = fxdr_unsigned(uid_t, sp->sa_uid);
 2242                 if (sp->sa_gid != newnfs_xdrneg1)
 2243                         nvap->na_gid = fxdr_unsigned(gid_t, sp->sa_gid);
 2244                 if (sp->sa_size != newnfs_xdrneg1)
 2245                         nvap->na_size = fxdr_unsigned(u_quad_t, sp->sa_size);
 2246                 if (sp->sa_atime.nfsv2_sec != newnfs_xdrneg1) {
 2247 #ifdef notyet
 2248                         fxdr_nfsv2time(&sp->sa_atime, &nvap->na_atime);
 2249 #else
 2250                         nvap->na_atime.tv_sec =
 2251                                 fxdr_unsigned(u_int32_t,sp->sa_atime.nfsv2_sec);
 2252                         nvap->na_atime.tv_nsec = 0;
 2253 #endif
 2254                 }
 2255                 if (sp->sa_mtime.nfsv2_sec != newnfs_xdrneg1)
 2256                         fxdr_nfsv2time(&sp->sa_mtime, &nvap->na_mtime);
 2257                 break;
 2258         case ND_NFSV3:
 2259                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2260                 if (*tl == newnfs_true) {
 2261                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2262                         nvap->na_mode = nfstov_mode(*tl);
 2263                 }
 2264                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2265                 if (*tl == newnfs_true) {
 2266                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2267                         nvap->na_uid = fxdr_unsigned(uid_t, *tl);
 2268                 }
 2269                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2270                 if (*tl == newnfs_true) {
 2271                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2272                         nvap->na_gid = fxdr_unsigned(gid_t, *tl);
 2273                 }
 2274                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2275                 if (*tl == newnfs_true) {
 2276                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 2277                         nvap->na_size = fxdr_hyper(tl);
 2278                 }
 2279                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2280                 switch (fxdr_unsigned(int, *tl)) {
 2281                 case NFSV3SATTRTIME_TOCLIENT:
 2282                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 2283                         fxdr_nfsv3time(tl, &nvap->na_atime);
 2284                         toclient = 1;
 2285                         break;
 2286                 case NFSV3SATTRTIME_TOSERVER:
 2287                         NFSGETTIME(&curtime);
 2288                         nvap->na_atime.tv_sec = curtime.tv_sec;
 2289                         nvap->na_atime.tv_nsec = curtime.tv_usec * 1000;
 2290                         nvap->na_vaflags |= VA_UTIMES_NULL;
 2291                         break;
 2292                 };
 2293                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2294                 switch (fxdr_unsigned(int, *tl)) {
 2295                 case NFSV3SATTRTIME_TOCLIENT:
 2296                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 2297                         fxdr_nfsv3time(tl, &nvap->na_mtime);
 2298                         nvap->na_vaflags &= ~VA_UTIMES_NULL;
 2299                         break;
 2300                 case NFSV3SATTRTIME_TOSERVER:
 2301                         NFSGETTIME(&curtime);
 2302                         nvap->na_mtime.tv_sec = curtime.tv_sec;
 2303                         nvap->na_mtime.tv_nsec = curtime.tv_usec * 1000;
 2304                         if (!toclient)
 2305                                 nvap->na_vaflags |= VA_UTIMES_NULL;
 2306                         break;
 2307                 };
 2308                 break;
 2309         case ND_NFSV4:
 2310                 error = nfsv4_sattr(nd, nvap, attrbitp, aclp, p);
 2311         };
 2312 nfsmout:
 2313         NFSEXITCODE2(error, nd);
 2314         return (error);
 2315 }
 2316 
 2317 /*
 2318  * Handle the setable attributes for V4.
 2319  * Returns NFSERR_BADXDR if it can't be parsed, 0 otherwise.
 2320  */
 2321 int
 2322 nfsv4_sattr(struct nfsrv_descript *nd, struct nfsvattr *nvap,
 2323     nfsattrbit_t *attrbitp, NFSACL_T *aclp, struct thread *p)
 2324 {
 2325         u_int32_t *tl;
 2326         int attrsum = 0;
 2327         int i, j;
 2328         int error, attrsize, bitpos, aclsize, aceerr, retnotsup = 0;
 2329         int toclient = 0;
 2330         u_char *cp, namestr[NFSV4_SMALLSTR + 1];
 2331         uid_t uid;
 2332         gid_t gid;
 2333         struct timeval curtime;
 2334 
 2335         error = nfsrv_getattrbits(nd, attrbitp, NULL, &retnotsup);
 2336         if (error)
 2337                 goto nfsmout;
 2338         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2339         attrsize = fxdr_unsigned(int, *tl);
 2340 
 2341         /*
 2342          * Loop around getting the setable attributes. If an unsupported
 2343          * one is found, set nd_repstat == NFSERR_ATTRNOTSUPP and return.
 2344          */
 2345         if (retnotsup) {
 2346                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
 2347                 bitpos = NFSATTRBIT_MAX;
 2348         } else {
 2349                 bitpos = 0;
 2350         }
 2351         for (; bitpos < NFSATTRBIT_MAX; bitpos++) {
 2352             if (attrsum > attrsize) {
 2353                 error = NFSERR_BADXDR;
 2354                 goto nfsmout;
 2355             }
 2356             if (NFSISSET_ATTRBIT(attrbitp, bitpos))
 2357                 switch (bitpos) {
 2358                 case NFSATTRBIT_SIZE:
 2359                         NFSM_DISSECT(tl, u_int32_t *, NFSX_HYPER);
 2360                         nvap->na_size = fxdr_hyper(tl);
 2361                         attrsum += NFSX_HYPER;
 2362                         break;
 2363                 case NFSATTRBIT_ACL:
 2364                         error = nfsrv_dissectacl(nd, aclp, &aceerr, &aclsize,
 2365                             p);
 2366                         if (error)
 2367                                 goto nfsmout;
 2368                         if (aceerr && !nd->nd_repstat)
 2369                                 nd->nd_repstat = aceerr;
 2370                         attrsum += aclsize;
 2371                         break;
 2372                 case NFSATTRBIT_ARCHIVE:
 2373                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2374                         if (!nd->nd_repstat)
 2375                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
 2376                         attrsum += NFSX_UNSIGNED;
 2377                         break;
 2378                 case NFSATTRBIT_HIDDEN:
 2379                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2380                         if (!nd->nd_repstat)
 2381                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
 2382                         attrsum += NFSX_UNSIGNED;
 2383                         break;
 2384                 case NFSATTRBIT_MIMETYPE:
 2385                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2386                         i = fxdr_unsigned(int, *tl);
 2387                         error = nfsm_advance(nd, NFSM_RNDUP(i), -1);
 2388                         if (error)
 2389                                 goto nfsmout;
 2390                         if (!nd->nd_repstat)
 2391                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
 2392                         attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(i));
 2393                         break;
 2394                 case NFSATTRBIT_MODE:
 2395                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2396                         nvap->na_mode = nfstov_mode(*tl);
 2397                         attrsum += NFSX_UNSIGNED;
 2398                         break;
 2399                 case NFSATTRBIT_OWNER:
 2400                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2401                         j = fxdr_unsigned(int, *tl);
 2402                         if (j < 0) {
 2403                                 error = NFSERR_BADXDR;
 2404                                 goto nfsmout;
 2405                         }
 2406                         if (j > NFSV4_SMALLSTR)
 2407                                 cp = malloc(j + 1, M_NFSSTRING, M_WAITOK);
 2408                         else
 2409                                 cp = namestr;
 2410                         error = nfsrv_mtostr(nd, cp, j);
 2411                         if (error) {
 2412                                 if (j > NFSV4_SMALLSTR)
 2413                                         free(cp, M_NFSSTRING);
 2414                                 goto nfsmout;
 2415                         }
 2416                         if (!nd->nd_repstat) {
 2417                                 nd->nd_repstat = nfsv4_strtouid(cp,j,&uid,p);
 2418                                 if (!nd->nd_repstat)
 2419                                         nvap->na_uid = uid;
 2420                         }
 2421                         if (j > NFSV4_SMALLSTR)
 2422                                 free(cp, M_NFSSTRING);
 2423                         attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(j));
 2424                         break;
 2425                 case NFSATTRBIT_OWNERGROUP:
 2426                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2427                         j = fxdr_unsigned(int, *tl);
 2428                         if (j < 0) {
 2429                                 error = NFSERR_BADXDR;
 2430                                 goto nfsmout;
 2431                         }
 2432                         if (j > NFSV4_SMALLSTR)
 2433                                 cp = malloc(j + 1, M_NFSSTRING, M_WAITOK);
 2434                         else
 2435                                 cp = namestr;
 2436                         error = nfsrv_mtostr(nd, cp, j);
 2437                         if (error) {
 2438                                 if (j > NFSV4_SMALLSTR)
 2439                                         free(cp, M_NFSSTRING);
 2440                                 goto nfsmout;
 2441                         }
 2442                         if (!nd->nd_repstat) {
 2443                                 nd->nd_repstat = nfsv4_strtogid(cp,j,&gid,p);
 2444                                 if (!nd->nd_repstat)
 2445                                         nvap->na_gid = gid;
 2446                         }
 2447                         if (j > NFSV4_SMALLSTR)
 2448                                 free(cp, M_NFSSTRING);
 2449                         attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(j));
 2450                         break;
 2451                 case NFSATTRBIT_SYSTEM:
 2452                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2453                         if (!nd->nd_repstat)
 2454                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
 2455                         attrsum += NFSX_UNSIGNED;
 2456                         break;
 2457                 case NFSATTRBIT_TIMEACCESSSET:
 2458                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2459                         attrsum += NFSX_UNSIGNED;
 2460                         if (fxdr_unsigned(int, *tl)==NFSV4SATTRTIME_TOCLIENT) {
 2461                             NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
 2462                             fxdr_nfsv4time(tl, &nvap->na_atime);
 2463                             toclient = 1;
 2464                             attrsum += NFSX_V4TIME;
 2465                         } else {
 2466                             NFSGETTIME(&curtime);
 2467                             nvap->na_atime.tv_sec = curtime.tv_sec;
 2468                             nvap->na_atime.tv_nsec = curtime.tv_usec * 1000;
 2469                             nvap->na_vaflags |= VA_UTIMES_NULL;
 2470                         }
 2471                         break;
 2472                 case NFSATTRBIT_TIMEBACKUP:
 2473                         NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
 2474                         if (!nd->nd_repstat)
 2475                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
 2476                         attrsum += NFSX_V4TIME;
 2477                         break;
 2478                 case NFSATTRBIT_TIMECREATE:
 2479                         NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
 2480                         if (!nd->nd_repstat)
 2481                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
 2482                         attrsum += NFSX_V4TIME;
 2483                         break;
 2484                 case NFSATTRBIT_TIMEMODIFYSET:
 2485                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2486                         attrsum += NFSX_UNSIGNED;
 2487                         if (fxdr_unsigned(int, *tl)==NFSV4SATTRTIME_TOCLIENT) {
 2488                             NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
 2489                             fxdr_nfsv4time(tl, &nvap->na_mtime);
 2490                             nvap->na_vaflags &= ~VA_UTIMES_NULL;
 2491                             attrsum += NFSX_V4TIME;
 2492                         } else {
 2493                             NFSGETTIME(&curtime);
 2494                             nvap->na_mtime.tv_sec = curtime.tv_sec;
 2495                             nvap->na_mtime.tv_nsec = curtime.tv_usec * 1000;
 2496                             if (!toclient)
 2497                                 nvap->na_vaflags |= VA_UTIMES_NULL;
 2498                         }
 2499                         break;
 2500                 default:
 2501                         nd->nd_repstat = NFSERR_ATTRNOTSUPP;
 2502                         /*
 2503                          * set bitpos so we drop out of the loop.
 2504                          */
 2505                         bitpos = NFSATTRBIT_MAX;
 2506                         break;
 2507                 };
 2508         }
 2509 
 2510         /*
 2511          * some clients pad the attrlist, so we need to skip over the
 2512          * padding.
 2513          */
 2514         if (attrsum > attrsize) {
 2515                 error = NFSERR_BADXDR;
 2516         } else {
 2517                 attrsize = NFSM_RNDUP(attrsize);
 2518                 if (attrsum < attrsize)
 2519                         error = nfsm_advance(nd, attrsize - attrsum, -1);
 2520         }
 2521 nfsmout:
 2522         NFSEXITCODE2(error, nd);
 2523         return (error);
 2524 }
 2525 
 2526 /*
 2527  * Check/setup export credentials.
 2528  */
 2529 int
 2530 nfsd_excred(struct nfsrv_descript *nd, struct nfsexstuff *exp,
 2531     struct ucred *credanon)
 2532 {
 2533         int error = 0;
 2534 
 2535         /*
 2536          * Check/setup credentials.
 2537          */
 2538         if (nd->nd_flag & ND_GSS)
 2539                 exp->nes_exflag &= ~MNT_EXPORTANON;
 2540 
 2541         /*
 2542          * Check to see if the operation is allowed for this security flavor.
 2543          * RFC2623 suggests that the NFSv3 Fsinfo RPC be allowed to
 2544          * AUTH_NONE or AUTH_SYS for file systems requiring RPCSEC_GSS.
 2545          * Also, allow Secinfo, so that it can acquire the correct flavor(s).
 2546          */
 2547         if (nfsvno_testexp(nd, exp) &&
 2548             nd->nd_procnum != NFSV4OP_SECINFO &&
 2549             nd->nd_procnum != NFSPROC_FSINFO) {
 2550                 if (nd->nd_flag & ND_NFSV4)
 2551                         error = NFSERR_WRONGSEC;
 2552                 else
 2553                         error = (NFSERR_AUTHERR | AUTH_TOOWEAK);
 2554                 goto out;
 2555         }
 2556 
 2557         /*
 2558          * Check to see if the file system is exported V4 only.
 2559          */
 2560         if (NFSVNO_EXV4ONLY(exp) && !(nd->nd_flag & ND_NFSV4)) {
 2561                 error = NFSERR_PROGNOTV4;
 2562                 goto out;
 2563         }
 2564 
 2565         /*
 2566          * Now, map the user credentials.
 2567          * (Note that ND_AUTHNONE will only be set for an NFSv3
 2568          *  Fsinfo RPC. If set for anything else, this code might need
 2569          *  to change.)
 2570          */
 2571         if (NFSVNO_EXPORTED(exp) &&
 2572             ((!(nd->nd_flag & ND_GSS) && nd->nd_cred->cr_uid == 0) ||
 2573              NFSVNO_EXPORTANON(exp) ||
 2574              (nd->nd_flag & ND_AUTHNONE))) {
 2575                 nd->nd_cred->cr_uid = credanon->cr_uid;
 2576                 nd->nd_cred->cr_gid = credanon->cr_gid;
 2577                 crsetgroups(nd->nd_cred, credanon->cr_ngroups,
 2578                     credanon->cr_groups);
 2579         }
 2580 
 2581 out:
 2582         NFSEXITCODE2(error, nd);
 2583         return (error);
 2584 }
 2585 
 2586 /*
 2587  * Check exports.
 2588  */
 2589 int
 2590 nfsvno_checkexp(struct mount *mp, struct sockaddr *nam, struct nfsexstuff *exp,
 2591     struct ucred **credp)
 2592 {
 2593         int i, error, *secflavors;
 2594 
 2595         error = VFS_CHECKEXP(mp, nam, &exp->nes_exflag, credp,
 2596             &exp->nes_numsecflavor, &secflavors);
 2597         if (error) {
 2598                 if (nfs_rootfhset) {
 2599                         exp->nes_exflag = 0;
 2600                         exp->nes_numsecflavor = 0;
 2601                         error = 0;
 2602                 }
 2603         } else {
 2604                 /* Copy the security flavors. */
 2605                 for (i = 0; i < exp->nes_numsecflavor; i++)
 2606                         exp->nes_secflavors[i] = secflavors[i];
 2607         }
 2608         NFSEXITCODE(error);
 2609         return (error);
 2610 }
 2611 
 2612 /*
 2613  * Get a vnode for a file handle and export stuff.
 2614  */
 2615 int
 2616 nfsvno_fhtovp(struct mount *mp, fhandle_t *fhp, struct sockaddr *nam,
 2617     int lktype, struct vnode **vpp, struct nfsexstuff *exp,
 2618     struct ucred **credp)
 2619 {
 2620         int i, error, *secflavors;
 2621 
 2622         *credp = NULL;
 2623         exp->nes_numsecflavor = 0;
 2624         if (VFS_NEEDSGIANT(mp))
 2625                 error = ESTALE;
 2626         else
 2627                 error = VFS_FHTOVP(mp, &fhp->fh_fid, LK_EXCLUSIVE, vpp);
 2628         if (error != 0)
 2629                 /* Make sure the server replies ESTALE to the client. */
 2630                 error = ESTALE;
 2631         if (nam && !error) {
 2632                 error = VFS_CHECKEXP(mp, nam, &exp->nes_exflag, credp,
 2633                     &exp->nes_numsecflavor, &secflavors);
 2634                 if (error) {
 2635                         if (nfs_rootfhset) {
 2636                                 exp->nes_exflag = 0;
 2637                                 exp->nes_numsecflavor = 0;
 2638                                 error = 0;
 2639                         } else {
 2640                                 vput(*vpp);
 2641                         }
 2642                 } else {
 2643                         /* Copy the security flavors. */
 2644                         for (i = 0; i < exp->nes_numsecflavor; i++)
 2645                                 exp->nes_secflavors[i] = secflavors[i];
 2646                 }
 2647         }
 2648         if (error == 0 && lktype == LK_SHARED)
 2649                 /*
 2650                  * It would be much better to pass lktype to VFS_FHTOVP(),
 2651                  * but this will have to do until VFS_FHTOVP() has a lock
 2652                  * type argument like VFS_VGET().
 2653                  */
 2654                 NFSVOPLOCK(*vpp, LK_DOWNGRADE | LK_RETRY);
 2655 
 2656         NFSEXITCODE(error);
 2657         return (error);
 2658 }
 2659 
 2660 /*
 2661  * nfsd_fhtovp() - convert a fh to a vnode ptr
 2662  *      - look up fsid in mount list (if not found ret error)
 2663  *      - get vp and export rights by calling nfsvno_fhtovp()
 2664  *      - if cred->cr_uid == 0 or MNT_EXPORTANON set it to credanon
 2665  *        for AUTH_SYS
 2666  *      - if mpp != NULL, return the mount point so that it can
 2667  *        be used for vn_finished_write() by the caller
 2668  */
 2669 void
 2670 nfsd_fhtovp(struct nfsrv_descript *nd, struct nfsrvfh *nfp, int lktype,
 2671     struct vnode **vpp, struct nfsexstuff *exp,
 2672     struct mount **mpp, int startwrite, struct thread *p)
 2673 {
 2674         struct mount *mp;
 2675         struct ucred *credanon;
 2676         fhandle_t *fhp;
 2677 
 2678         fhp = (fhandle_t *)nfp->nfsrvfh_data;
 2679         /*
 2680          * Check for the special case of the nfsv4root_fh.
 2681          */
 2682         mp = vfs_busyfs(&fhp->fh_fsid);
 2683         if (mpp != NULL)
 2684                 *mpp = mp;
 2685         if (mp == NULL) {
 2686                 *vpp = NULL;
 2687                 nd->nd_repstat = ESTALE;
 2688                 goto out;
 2689         }
 2690 
 2691         if (startwrite)
 2692                 vn_start_write(NULL, mpp, V_WAIT);
 2693 
 2694         nd->nd_repstat = nfsvno_fhtovp(mp, fhp, nd->nd_nam, lktype, vpp, exp,
 2695             &credanon);
 2696         vfs_unbusy(mp);
 2697 
 2698         /*
 2699          * For NFSv4 without a pseudo root fs, unexported file handles
 2700          * can be returned, so that Lookup works everywhere.
 2701          */
 2702         if (!nd->nd_repstat && exp->nes_exflag == 0 &&
 2703             !(nd->nd_flag & ND_NFSV4)) {
 2704                 vput(*vpp);
 2705                 nd->nd_repstat = EACCES;
 2706         }
 2707 
 2708         /*
 2709          * Personally, I've never seen any point in requiring a
 2710          * reserved port#, since only in the rare case where the
 2711          * clients are all boxes with secure system priviledges,
 2712          * does it provide any enhanced security, but... some people
 2713          * believe it to be useful and keep putting this code back in.
 2714          * (There is also some "security checker" out there that
 2715          *  complains if the nfs server doesn't enforce this.)
 2716          * However, note the following:
 2717          * RFC3530 (NFSv4) specifies that a reserved port# not be
 2718          *      required.
 2719          * RFC2623 recommends that, if a reserved port# is checked for,
 2720          *      that there be a way to turn that off--> ifdef'd.
 2721          */
 2722 #ifdef NFS_REQRSVPORT
 2723         if (!nd->nd_repstat) {
 2724                 struct sockaddr_in *saddr;
 2725                 struct sockaddr_in6 *saddr6;
 2726 
 2727                 saddr = NFSSOCKADDR(nd->nd_nam, struct sockaddr_in *);
 2728                 saddr6 = NFSSOCKADDR(nd->nd_nam, struct sockaddr_in6 *);
 2729                 if (!(nd->nd_flag & ND_NFSV4) &&
 2730                     ((saddr->sin_family == AF_INET &&
 2731                       ntohs(saddr->sin_port) >= IPPORT_RESERVED) ||
 2732                      (saddr6->sin6_family == AF_INET6 &&
 2733                       ntohs(saddr6->sin6_port) >= IPPORT_RESERVED))) {
 2734                         vput(*vpp);
 2735                         nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
 2736                 }
 2737         }
 2738 #endif  /* NFS_REQRSVPORT */
 2739 
 2740         /*
 2741          * Check/setup credentials.
 2742          */
 2743         if (!nd->nd_repstat) {
 2744                 nd->nd_saveduid = nd->nd_cred->cr_uid;
 2745                 nd->nd_repstat = nfsd_excred(nd, exp, credanon);
 2746                 if (nd->nd_repstat)
 2747                         vput(*vpp);
 2748         }
 2749         if (credanon != NULL)
 2750                 crfree(credanon);
 2751         if (nd->nd_repstat) {
 2752                 if (startwrite)
 2753                         vn_finished_write(mp);
 2754                 *vpp = NULL;
 2755                 if (mpp != NULL)
 2756                         *mpp = NULL;
 2757         }
 2758 
 2759 out:
 2760         NFSEXITCODE2(0, nd);
 2761 }
 2762 
 2763 /*
 2764  * glue for fp.
 2765  */
 2766 int
 2767 fp_getfvp(struct thread *p, int fd, struct file **fpp, struct vnode **vpp)
 2768 {
 2769         struct filedesc *fdp;
 2770         struct file *fp;
 2771         int error = 0;
 2772 
 2773         fdp = p->td_proc->p_fd;
 2774         if (fd >= fdp->fd_nfiles ||
 2775             (fp = fdp->fd_ofiles[fd]) == NULL) {
 2776                 error = EBADF;
 2777                 goto out;
 2778         }
 2779         *fpp = fp;
 2780 
 2781 out:
 2782         NFSEXITCODE(error);
 2783         return (error);
 2784 }
 2785 
 2786 /*
 2787  * Called from nfssvc() to update the exports list. Just call
 2788  * vfs_export(). This has to be done, since the v4 root fake fs isn't
 2789  * in the mount list.
 2790  */
 2791 int
 2792 nfsrv_v4rootexport(void *argp, struct ucred *cred, struct thread *p)
 2793 {
 2794         struct nfsex_args *nfsexargp = (struct nfsex_args *)argp;
 2795         int error = 0;
 2796         struct nameidata nd;
 2797         fhandle_t fh;
 2798 
 2799         error = vfs_export(&nfsv4root_mnt, &nfsexargp->export);
 2800         if ((nfsexargp->export.ex_flags & MNT_DELEXPORT) != 0)
 2801                 nfs_rootfhset = 0;
 2802         else if (error == 0) {
 2803                 if (nfsexargp->fspec == NULL) {
 2804                         error = EPERM;
 2805                         goto out;
 2806                 }
 2807                 /*
 2808                  * If fspec != NULL, this is the v4root path.
 2809                  */
 2810                 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE, UIO_USERSPACE,
 2811                     nfsexargp->fspec, p);
 2812                 if ((error = namei(&nd)) != 0)
 2813                         goto out;
 2814                 error = nfsvno_getfh(nd.ni_vp, &fh, p);
 2815                 vrele(nd.ni_vp);
 2816                 if (!error) {
 2817                         nfs_rootfh.nfsrvfh_len = NFSX_MYFH;
 2818                         NFSBCOPY((caddr_t)&fh,
 2819                             nfs_rootfh.nfsrvfh_data,
 2820                             sizeof (fhandle_t));
 2821                         nfs_rootfhset = 1;
 2822                 }
 2823         }
 2824 
 2825 out:
 2826         NFSEXITCODE(error);
 2827         return (error);
 2828 }
 2829 
 2830 /*
 2831  * Get the tcp socket sequence numbers we need.
 2832  * (Maybe this should be moved to the tcp sources?)
 2833  */
 2834 int
 2835 nfsrv_getsocksndseq(struct socket *so, tcp_seq *maxp, tcp_seq *unap)
 2836 {
 2837         struct inpcb *inp;
 2838         struct tcpcb *tp;
 2839         int error = 0;
 2840 
 2841         inp = sotoinpcb(so);
 2842         KASSERT(inp != NULL, ("nfsrv_getsocksndseq: inp == NULL"));
 2843         INP_RLOCK(inp);
 2844         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 2845                 INP_RUNLOCK(inp);
 2846                 error = EPIPE;
 2847                 goto out;
 2848         }
 2849         tp = intotcpcb(inp);
 2850         if (tp->t_state != TCPS_ESTABLISHED) {
 2851                 INP_RUNLOCK(inp);
 2852                 error = EPIPE;
 2853                 goto out;
 2854         }
 2855         *maxp = tp->snd_max;
 2856         *unap = tp->snd_una;
 2857         INP_RUNLOCK(inp);
 2858 
 2859 out:
 2860         NFSEXITCODE(error);
 2861         return (error);
 2862 }
 2863 
 2864 /*
 2865  * This function needs to test to see if the system is near its limit
 2866  * for memory allocation via malloc() or mget() and return True iff
 2867  * either of these resources are near their limit.
 2868  * XXX (For now, this is just a stub.)
 2869  */
 2870 int nfsrv_testmalloclimit = 0;
 2871 int
 2872 nfsrv_mallocmget_limit(void)
 2873 {
 2874         static int printmesg = 0;
 2875         static int testval = 1;
 2876 
 2877         if (nfsrv_testmalloclimit && (testval++ % 1000) == 0) {
 2878                 if ((printmesg++ % 100) == 0)
 2879                         printf("nfsd: malloc/mget near limit\n");
 2880                 return (1);
 2881         }
 2882         return (0);
 2883 }
 2884 
 2885 /*
 2886  * BSD specific initialization of a mount point.
 2887  */
 2888 void
 2889 nfsd_mntinit(void)
 2890 {
 2891         static int inited = 0;
 2892 
 2893         if (inited)
 2894                 return;
 2895         inited = 1;
 2896         nfsv4root_mnt.mnt_flag = (MNT_RDONLY | MNT_EXPORTED);
 2897         TAILQ_INIT(&nfsv4root_mnt.mnt_nvnodelist);
 2898         nfsv4root_mnt.mnt_export = NULL;
 2899         TAILQ_INIT(&nfsv4root_opt);
 2900         TAILQ_INIT(&nfsv4root_newopt);
 2901         nfsv4root_mnt.mnt_opt = &nfsv4root_opt;
 2902         nfsv4root_mnt.mnt_optnew = &nfsv4root_newopt;
 2903         nfsv4root_mnt.mnt_nvnodelistsize = 0;
 2904 }
 2905 
 2906 /*
 2907  * Get a vnode for a file handle, without checking exports, etc.
 2908  */
 2909 struct vnode *
 2910 nfsvno_getvp(fhandle_t *fhp)
 2911 {
 2912         struct mount *mp;
 2913         struct vnode *vp;
 2914         int error;
 2915 
 2916         mp = vfs_busyfs(&fhp->fh_fsid);
 2917         if (mp == NULL)
 2918                 return (NULL);
 2919         error = VFS_FHTOVP(mp, &fhp->fh_fid, LK_EXCLUSIVE, &vp);
 2920         vfs_unbusy(mp);
 2921         if (error)
 2922                 return (NULL);
 2923         return (vp);
 2924 }
 2925 
 2926 /*
 2927  * Do a local VOP_ADVLOCK().
 2928  */
 2929 int
 2930 nfsvno_advlock(struct vnode *vp, int ftype, u_int64_t first,
 2931     u_int64_t end, struct thread *td)
 2932 {
 2933         int error = 0;
 2934         struct flock fl;
 2935         u_int64_t tlen;
 2936 
 2937         if (nfsrv_dolocallocks == 0)
 2938                 goto out;
 2939 
 2940         /* Check for VI_DOOMED here, so that VOP_ADVLOCK() isn't performed. */
 2941         if ((vp->v_iflag & VI_DOOMED) != 0) {
 2942                 error = EPERM;
 2943                 goto out;
 2944         }
 2945 
 2946         fl.l_whence = SEEK_SET;
 2947         fl.l_type = ftype;
 2948         fl.l_start = (off_t)first;
 2949         if (end == NFS64BITSSET) {
 2950                 fl.l_len = 0;
 2951         } else {
 2952                 tlen = end - first;
 2953                 fl.l_len = (off_t)tlen;
 2954         }
 2955         /*
 2956          * For FreeBSD8, the l_pid and l_sysid must be set to the same
 2957          * values for all calls, so that all locks will be held by the
 2958          * nfsd server. (The nfsd server handles conflicts between the
 2959          * various clients.)
 2960          * Since an NFSv4 lockowner is a ClientID plus an array of up to 1024
 2961          * bytes, so it can't be put in l_sysid.
 2962          */
 2963         if (nfsv4_sysid == 0)
 2964                 nfsv4_sysid = nlm_acquire_next_sysid();
 2965         fl.l_pid = (pid_t)0;
 2966         fl.l_sysid = (int)nfsv4_sysid;
 2967 
 2968         NFSVOPUNLOCK(vp, 0);
 2969         if (ftype == F_UNLCK)
 2970                 error = VOP_ADVLOCK(vp, (caddr_t)td->td_proc, F_UNLCK, &fl,
 2971                     (F_POSIX | F_REMOTE));
 2972         else
 2973                 error = VOP_ADVLOCK(vp, (caddr_t)td->td_proc, F_SETLK, &fl,
 2974                     (F_POSIX | F_REMOTE));
 2975         NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
 2976 
 2977 out:
 2978         NFSEXITCODE(error);
 2979         return (error);
 2980 }
 2981 
 2982 /*
 2983  * Check the nfsv4 root exports.
 2984  */
 2985 int
 2986 nfsvno_v4rootexport(struct nfsrv_descript *nd)
 2987 {
 2988         struct ucred *credanon;
 2989         int exflags, error = 0, numsecflavor, *secflavors, i;
 2990 
 2991         error = vfs_stdcheckexp(&nfsv4root_mnt, nd->nd_nam, &exflags,
 2992             &credanon, &numsecflavor, &secflavors);
 2993         if (error) {
 2994                 error = NFSERR_PROGUNAVAIL;
 2995                 goto out;
 2996         }
 2997         if (credanon != NULL)
 2998                 crfree(credanon);
 2999         for (i = 0; i < numsecflavor; i++) {
 3000                 if (secflavors[i] == AUTH_SYS)
 3001                         nd->nd_flag |= ND_EXAUTHSYS;
 3002                 else if (secflavors[i] == RPCSEC_GSS_KRB5)
 3003                         nd->nd_flag |= ND_EXGSS;
 3004                 else if (secflavors[i] == RPCSEC_GSS_KRB5I)
 3005                         nd->nd_flag |= ND_EXGSSINTEGRITY;
 3006                 else if (secflavors[i] == RPCSEC_GSS_KRB5P)
 3007                         nd->nd_flag |= ND_EXGSSPRIVACY;
 3008         }
 3009 
 3010 out:
 3011         NFSEXITCODE(error);
 3012         return (error);
 3013 }
 3014 
 3015 /*
 3016  * Nfs server psuedo system call for the nfsd's
 3017  */
 3018 /*
 3019  * MPSAFE
 3020  */
 3021 static int
 3022 nfssvc_nfsd(struct thread *td, struct nfssvc_args *uap)
 3023 {
 3024         struct file *fp;
 3025         struct nfsd_addsock_args sockarg;
 3026         struct nfsd_nfsd_args nfsdarg;
 3027         int error;
 3028 
 3029         if (uap->flag & NFSSVC_NFSDADDSOCK) {
 3030                 error = copyin(uap->argp, (caddr_t)&sockarg, sizeof (sockarg));
 3031                 if (error)
 3032                         goto out;
 3033                 /*
 3034                  * Since we don't know what rights might be required,
 3035                  * pretend that we need them all. It is better to be too
 3036                  * careful than too reckless.
 3037                  */
 3038                 if ((error = fget(td, sockarg.sock, CAP_SOCK_ALL, &fp)) != 0)
 3039                         goto out;
 3040                 if (fp->f_type != DTYPE_SOCKET) {
 3041                         fdrop(fp, td);
 3042                         error = EPERM;
 3043                         goto out;
 3044                 }
 3045                 error = nfsrvd_addsock(fp);
 3046                 fdrop(fp, td);
 3047         } else if (uap->flag & NFSSVC_NFSDNFSD) {
 3048                 if (uap->argp == NULL) {
 3049                         error = EINVAL;
 3050                         goto out;
 3051                 }
 3052                 error = copyin(uap->argp, (caddr_t)&nfsdarg,
 3053                     sizeof (nfsdarg));
 3054                 if (error)
 3055                         goto out;
 3056                 error = nfsrvd_nfsd(td, &nfsdarg);
 3057         } else {
 3058                 error = nfssvc_srvcall(td, uap, td->td_ucred);
 3059         }
 3060 
 3061 out:
 3062         NFSEXITCODE(error);
 3063         return (error);
 3064 }
 3065 
 3066 static int
 3067 nfssvc_srvcall(struct thread *p, struct nfssvc_args *uap, struct ucred *cred)
 3068 {
 3069         struct nfsex_args export;
 3070         struct file *fp = NULL;
 3071         int stablefd, len;
 3072         struct nfsd_clid adminrevoke;
 3073         struct nfsd_dumplist dumplist;
 3074         struct nfsd_dumpclients *dumpclients;
 3075         struct nfsd_dumplocklist dumplocklist;
 3076         struct nfsd_dumplocks *dumplocks;
 3077         struct nameidata nd;
 3078         vnode_t vp;
 3079         int error = EINVAL;
 3080         struct proc *procp;
 3081 
 3082         if (uap->flag & NFSSVC_PUBLICFH) {
 3083                 NFSBZERO((caddr_t)&nfs_pubfh.nfsrvfh_data,
 3084                     sizeof (fhandle_t));
 3085                 error = copyin(uap->argp,
 3086                     &nfs_pubfh.nfsrvfh_data, sizeof (fhandle_t));
 3087                 if (!error)
 3088                         nfs_pubfhset = 1;
 3089         } else if (uap->flag & NFSSVC_V4ROOTEXPORT) {
 3090                 error = copyin(uap->argp,(caddr_t)&export,
 3091                     sizeof (struct nfsex_args));
 3092                 if (!error)
 3093                         error = nfsrv_v4rootexport(&export, cred, p);
 3094         } else if (uap->flag & NFSSVC_NOPUBLICFH) {
 3095                 nfs_pubfhset = 0;
 3096                 error = 0;
 3097         } else if (uap->flag & NFSSVC_STABLERESTART) {
 3098                 error = copyin(uap->argp, (caddr_t)&stablefd,
 3099                     sizeof (int));
 3100                 if (!error)
 3101                         error = fp_getfvp(p, stablefd, &fp, &vp);
 3102                 if (!error && (NFSFPFLAG(fp) & (FREAD | FWRITE)) != (FREAD | FWRITE))
 3103                         error = EBADF;
 3104                 if (!error && newnfs_numnfsd != 0)
 3105                         error = EPERM;
 3106                 if (!error) {
 3107                         nfsrv_stablefirst.nsf_fp = fp;
 3108                         nfsrv_setupstable(p);
 3109                 }
 3110         } else if (uap->flag & NFSSVC_ADMINREVOKE) {
 3111                 error = copyin(uap->argp, (caddr_t)&adminrevoke,
 3112                     sizeof (struct nfsd_clid));
 3113                 if (!error)
 3114                         error = nfsrv_adminrevoke(&adminrevoke, p);
 3115         } else if (uap->flag & NFSSVC_DUMPCLIENTS) {
 3116                 error = copyin(uap->argp, (caddr_t)&dumplist,
 3117                     sizeof (struct nfsd_dumplist));
 3118                 if (!error && (dumplist.ndl_size < 1 ||
 3119                         dumplist.ndl_size > NFSRV_MAXDUMPLIST))
 3120                         error = EPERM;
 3121                 if (!error) {
 3122                     len = sizeof (struct nfsd_dumpclients) * dumplist.ndl_size;
 3123                     dumpclients = (struct nfsd_dumpclients *)malloc(len,
 3124                         M_TEMP, M_WAITOK);
 3125                     nfsrv_dumpclients(dumpclients, dumplist.ndl_size);
 3126                     error = copyout(dumpclients,
 3127                         CAST_USER_ADDR_T(dumplist.ndl_list), len);
 3128                     free((caddr_t)dumpclients, M_TEMP);
 3129                 }
 3130         } else if (uap->flag & NFSSVC_DUMPLOCKS) {
 3131                 error = copyin(uap->argp, (caddr_t)&dumplocklist,
 3132                     sizeof (struct nfsd_dumplocklist));
 3133                 if (!error && (dumplocklist.ndllck_size < 1 ||
 3134                         dumplocklist.ndllck_size > NFSRV_MAXDUMPLIST))
 3135                         error = EPERM;
 3136                 if (!error)
 3137                         error = nfsrv_lookupfilename(&nd,
 3138                                 dumplocklist.ndllck_fname, p);
 3139                 if (!error) {
 3140                         len = sizeof (struct nfsd_dumplocks) *
 3141                                 dumplocklist.ndllck_size;
 3142                         dumplocks = (struct nfsd_dumplocks *)malloc(len,
 3143                                 M_TEMP, M_WAITOK);
 3144                         nfsrv_dumplocks(nd.ni_vp, dumplocks,
 3145                             dumplocklist.ndllck_size, p);
 3146                         vput(nd.ni_vp);
 3147                         error = copyout(dumplocks,
 3148                             CAST_USER_ADDR_T(dumplocklist.ndllck_list), len);
 3149                         free((caddr_t)dumplocks, M_TEMP);
 3150                 }
 3151         } else if (uap->flag & NFSSVC_BACKUPSTABLE) {
 3152                 procp = p->td_proc;
 3153                 PROC_LOCK(procp);
 3154                 nfsd_master_pid = procp->p_pid;
 3155                 bcopy(procp->p_comm, nfsd_master_comm, MAXCOMLEN + 1);
 3156                 nfsd_master_start = procp->p_stats->p_start;
 3157                 nfsd_master_proc = procp;
 3158                 PROC_UNLOCK(procp);
 3159         }
 3160 
 3161         NFSEXITCODE(error);
 3162         return (error);
 3163 }
 3164 
 3165 /*
 3166  * Check exports.
 3167  * Returns 0 if ok, 1 otherwise.
 3168  */
 3169 int
 3170 nfsvno_testexp(struct nfsrv_descript *nd, struct nfsexstuff *exp)
 3171 {
 3172         int i;
 3173 
 3174         /*
 3175          * This seems odd, but allow the case where the security flavor
 3176          * list is empty. This happens when NFSv4 is traversing non-exported
 3177          * file systems. Exported file systems should always have a non-empty
 3178          * security flavor list.
 3179          */
 3180         if (exp->nes_numsecflavor == 0)
 3181                 return (0);
 3182 
 3183         for (i = 0; i < exp->nes_numsecflavor; i++) {
 3184                 /*
 3185                  * The tests for privacy and integrity must be first,
 3186                  * since ND_GSS is set for everything but AUTH_SYS.
 3187                  */
 3188                 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5P &&
 3189                     (nd->nd_flag & ND_GSSPRIVACY))
 3190                         return (0);
 3191                 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5I &&
 3192                     (nd->nd_flag & ND_GSSINTEGRITY))
 3193                         return (0);
 3194                 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5 &&
 3195                     (nd->nd_flag & ND_GSS))
 3196                         return (0);
 3197                 if (exp->nes_secflavors[i] == AUTH_SYS &&
 3198                     (nd->nd_flag & ND_GSS) == 0)
 3199                         return (0);
 3200         }
 3201         return (1);
 3202 }
 3203 
 3204 /*
 3205  * Calculate a hash value for the fid in a file handle.
 3206  */
 3207 uint32_t
 3208 nfsrv_hashfh(fhandle_t *fhp)
 3209 {
 3210         uint32_t hashval;
 3211 
 3212         hashval = hash32_buf(&fhp->fh_fid, sizeof(struct fid), 0);
 3213         return (hashval);
 3214 }
 3215 
 3216 /*
 3217  * Signal the userland master nfsd to backup the stable restart file.
 3218  */
 3219 void
 3220 nfsrv_backupstable(void)
 3221 {
 3222         struct proc *procp;
 3223 
 3224         if (nfsd_master_proc != NULL) {
 3225                 procp = pfind(nfsd_master_pid);
 3226                 /* Try to make sure it is the correct process. */
 3227                 if (procp == nfsd_master_proc &&
 3228                     procp->p_stats->p_start.tv_sec ==
 3229                     nfsd_master_start.tv_sec &&
 3230                     procp->p_stats->p_start.tv_usec ==
 3231                     nfsd_master_start.tv_usec &&
 3232                     strcmp(procp->p_comm, nfsd_master_comm) == 0)
 3233                         kern_psignal(procp, SIGUSR2);
 3234                 else
 3235                         nfsd_master_proc = NULL;
 3236 
 3237                 if (procp != NULL)
 3238                         PROC_UNLOCK(procp);
 3239         }
 3240 }
 3241 
 3242 extern int (*nfsd_call_nfsd)(struct thread *, struct nfssvc_args *);
 3243 
 3244 /*
 3245  * Called once to initialize data structures...
 3246  */
 3247 static int
 3248 nfsd_modevent(module_t mod, int type, void *data)
 3249 {
 3250         int error = 0;
 3251         static int loaded = 0;
 3252 
 3253         switch (type) {
 3254         case MOD_LOAD:
 3255                 if (loaded)
 3256                         goto out;
 3257                 newnfs_portinit();
 3258                 mtx_init(&nfs_cache_mutex, "nfs_cache_mutex", NULL, MTX_DEF);
 3259                 mtx_init(&nfs_v4root_mutex, "nfs_v4root_mutex", NULL, MTX_DEF);
 3260                 mtx_init(&nfsv4root_mnt.mnt_mtx, "struct mount mtx", NULL,
 3261                     MTX_DEF);
 3262                 lockinit(&nfsv4root_mnt.mnt_explock, PVFS, "explock", 0, 0);
 3263                 nfsrvd_initcache();
 3264                 nfsd_init();
 3265                 NFSD_LOCK();
 3266                 nfsrvd_init(0);
 3267                 NFSD_UNLOCK();
 3268                 nfsd_mntinit();
 3269 #ifdef VV_DISABLEDELEG
 3270                 vn_deleg_ops.vndeleg_recall = nfsd_recalldelegation;
 3271                 vn_deleg_ops.vndeleg_disable = nfsd_disabledelegation;
 3272 #endif
 3273                 nfsd_call_servertimer = nfsrv_servertimer;
 3274                 nfsd_call_nfsd = nfssvc_nfsd;
 3275                 loaded = 1;
 3276                 break;
 3277 
 3278         case MOD_UNLOAD:
 3279                 if (newnfs_numnfsd != 0) {
 3280                         error = EBUSY;
 3281                         break;
 3282                 }
 3283 
 3284 #ifdef VV_DISABLEDELEG
 3285                 vn_deleg_ops.vndeleg_recall = NULL;
 3286                 vn_deleg_ops.vndeleg_disable = NULL;
 3287 #endif
 3288                 nfsd_call_servertimer = NULL;
 3289                 nfsd_call_nfsd = NULL;
 3290 
 3291                 /* Clean out all NFSv4 state. */
 3292                 nfsrv_throwawayallstate(curthread);
 3293 
 3294                 /* Clean the NFS server reply cache */
 3295                 nfsrvd_cleancache();
 3296 
 3297                 /* Free up the krpc server pool. */
 3298                 if (nfsrvd_pool != NULL)
 3299                         svcpool_destroy(nfsrvd_pool);
 3300 
 3301                 /* and get rid of the locks */
 3302                 mtx_destroy(&nfs_cache_mutex);
 3303                 mtx_destroy(&nfs_v4root_mutex);
 3304                 mtx_destroy(&nfsv4root_mnt.mnt_mtx);
 3305                 lockdestroy(&nfsv4root_mnt.mnt_explock);
 3306                 loaded = 0;
 3307                 break;
 3308         default:
 3309                 error = EOPNOTSUPP;
 3310                 break;
 3311         }
 3312 
 3313 out:
 3314         NFSEXITCODE(error);
 3315         return (error);
 3316 }
 3317 static moduledata_t nfsd_mod = {
 3318         "nfsd",
 3319         nfsd_modevent,
 3320         NULL,
 3321 };
 3322 DECLARE_MODULE(nfsd, nfsd_mod, SI_SUB_VFS, SI_ORDER_ANY);
 3323 
 3324 /* So that loader and kldload(2) can find us, wherever we are.. */
 3325 MODULE_VERSION(nfsd, 1);
 3326 MODULE_DEPEND(nfsd, nfscommon, 1, 1, 1);
 3327 MODULE_DEPEND(nfsd, nfslock, 1, 1, 1);
 3328 MODULE_DEPEND(nfsd, nfslockd, 1, 1, 1);
 3329 MODULE_DEPEND(nfsd, krpc, 1, 1, 1);
 3330 MODULE_DEPEND(nfsd, nfssvc, 1, 1, 1);
 3331 

Cache object: 98c8afd03a98c40ff4a76851d584f45e


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