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/nfsclient/nfs_clport.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/11.1/sys/fs/nfsclient/nfs_clport.c 317520 2017-04-27 20:14:54Z rmacklem $");
   36 
   37 #include "opt_inet.h"
   38 #include "opt_inet6.h"
   39 
   40 #include <sys/capsicum.h>
   41 
   42 /*
   43  * generally, I don't like #includes inside .h files, but it seems to
   44  * be the easiest way to handle the port.
   45  */
   46 #include <sys/fail.h>
   47 #include <sys/hash.h>
   48 #include <sys/sysctl.h>
   49 #include <fs/nfs/nfsport.h>
   50 #include <netinet/in_fib.h>
   51 #include <netinet/if_ether.h>
   52 #include <netinet6/ip6_var.h>
   53 #include <net/if_types.h>
   54 
   55 #include <fs/nfsclient/nfs_kdtrace.h>
   56 
   57 #ifdef KDTRACE_HOOKS
   58 dtrace_nfsclient_attrcache_flush_probe_func_t
   59                 dtrace_nfscl_attrcache_flush_done_probe;
   60 uint32_t        nfscl_attrcache_flush_done_id;
   61 
   62 dtrace_nfsclient_attrcache_get_hit_probe_func_t
   63                 dtrace_nfscl_attrcache_get_hit_probe;
   64 uint32_t        nfscl_attrcache_get_hit_id;
   65 
   66 dtrace_nfsclient_attrcache_get_miss_probe_func_t
   67                 dtrace_nfscl_attrcache_get_miss_probe;
   68 uint32_t        nfscl_attrcache_get_miss_id;
   69 
   70 dtrace_nfsclient_attrcache_load_probe_func_t
   71                 dtrace_nfscl_attrcache_load_done_probe;
   72 uint32_t        nfscl_attrcache_load_done_id;
   73 #endif /* !KDTRACE_HOOKS */
   74 
   75 extern u_int32_t newnfs_true, newnfs_false, newnfs_xdrneg1;
   76 extern struct vop_vector newnfs_vnodeops;
   77 extern struct vop_vector newnfs_fifoops;
   78 extern uma_zone_t newnfsnode_zone;
   79 extern struct buf_ops buf_ops_newnfs;
   80 extern int ncl_pbuf_freecnt;
   81 extern short nfsv4_cbport;
   82 extern int nfscl_enablecallb;
   83 extern int nfs_numnfscbd;
   84 extern int nfscl_inited;
   85 struct mtx ncl_iod_mutex;
   86 NFSDLOCKMUTEX;
   87 
   88 extern void (*ncl_call_invalcaches)(struct vnode *);
   89 
   90 SYSCTL_DECL(_vfs_nfs);
   91 static int ncl_fileid_maxwarnings = 10;
   92 SYSCTL_INT(_vfs_nfs, OID_AUTO, fileid_maxwarnings, CTLFLAG_RWTUN,
   93     &ncl_fileid_maxwarnings, 0,
   94     "Limit fileid corruption warnings; 0 is off; -1 is unlimited");
   95 static volatile int ncl_fileid_nwarnings;
   96 
   97 static void nfscl_warn_fileid(struct nfsmount *, struct nfsvattr *,
   98     struct nfsvattr *);
   99 
  100 /*
  101  * Comparison function for vfs_hash functions.
  102  */
  103 int
  104 newnfs_vncmpf(struct vnode *vp, void *arg)
  105 {
  106         struct nfsfh *nfhp = (struct nfsfh *)arg;
  107         struct nfsnode *np = VTONFS(vp);
  108 
  109         if (np->n_fhp->nfh_len != nfhp->nfh_len ||
  110             NFSBCMP(np->n_fhp->nfh_fh, nfhp->nfh_fh, nfhp->nfh_len))
  111                 return (1);
  112         return (0);
  113 }
  114 
  115 /*
  116  * Look up a vnode/nfsnode by file handle.
  117  * Callers must check for mount points!!
  118  * In all cases, a pointer to a
  119  * nfsnode structure is returned.
  120  * This variant takes a "struct nfsfh *" as second argument and uses
  121  * that structure up, either by hanging off the nfsnode or FREEing it.
  122  */
  123 int
  124 nfscl_nget(struct mount *mntp, struct vnode *dvp, struct nfsfh *nfhp,
  125     struct componentname *cnp, struct thread *td, struct nfsnode **npp,
  126     void *stuff, int lkflags)
  127 {
  128         struct nfsnode *np, *dnp;
  129         struct vnode *vp, *nvp;
  130         struct nfsv4node *newd, *oldd;
  131         int error;
  132         u_int hash;
  133         struct nfsmount *nmp;
  134 
  135         nmp = VFSTONFS(mntp);
  136         dnp = VTONFS(dvp);
  137         *npp = NULL;
  138 
  139         hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len, FNV1_32_INIT);
  140 
  141         error = vfs_hash_get(mntp, hash, lkflags,
  142             td, &nvp, newnfs_vncmpf, nfhp);
  143         if (error == 0 && nvp != NULL) {
  144                 /*
  145                  * I believe there is a slight chance that vgonel() could
  146                  * get called on this vnode between when NFSVOPLOCK() drops
  147                  * the VI_LOCK() and vget() acquires it again, so that it
  148                  * hasn't yet had v_usecount incremented. If this were to
  149                  * happen, the VI_DOOMED flag would be set, so check for
  150                  * that here. Since we now have the v_usecount incremented,
  151                  * we should be ok until we vrele() it, if the VI_DOOMED
  152                  * flag isn't set now.
  153                  */
  154                 VI_LOCK(nvp);
  155                 if ((nvp->v_iflag & VI_DOOMED)) {
  156                         VI_UNLOCK(nvp);
  157                         vrele(nvp);
  158                         error = ENOENT;
  159                 } else {
  160                         VI_UNLOCK(nvp);
  161                 }
  162         }
  163         if (error) {
  164                 FREE((caddr_t)nfhp, M_NFSFH);
  165                 return (error);
  166         }
  167         if (nvp != NULL) {
  168                 np = VTONFS(nvp);
  169                 /*
  170                  * For NFSv4, check to see if it is the same name and
  171                  * replace the name, if it is different.
  172                  */
  173                 oldd = newd = NULL;
  174                 if ((nmp->nm_flag & NFSMNT_NFSV4) && np->n_v4 != NULL &&
  175                     nvp->v_type == VREG &&
  176                     (np->n_v4->n4_namelen != cnp->cn_namelen ||
  177                      NFSBCMP(cnp->cn_nameptr, NFS4NODENAME(np->n_v4),
  178                      cnp->cn_namelen) ||
  179                      dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen ||
  180                      NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
  181                      dnp->n_fhp->nfh_len))) {
  182                     MALLOC(newd, struct nfsv4node *,
  183                         sizeof (struct nfsv4node) + dnp->n_fhp->nfh_len +
  184                         + cnp->cn_namelen - 1, M_NFSV4NODE, M_WAITOK);
  185                     NFSLOCKNODE(np);
  186                     if (newd != NULL && np->n_v4 != NULL && nvp->v_type == VREG
  187                         && (np->n_v4->n4_namelen != cnp->cn_namelen ||
  188                          NFSBCMP(cnp->cn_nameptr, NFS4NODENAME(np->n_v4),
  189                          cnp->cn_namelen) ||
  190                          dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen ||
  191                          NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
  192                          dnp->n_fhp->nfh_len))) {
  193                         oldd = np->n_v4;
  194                         np->n_v4 = newd;
  195                         newd = NULL;
  196                         np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len;
  197                         np->n_v4->n4_namelen = cnp->cn_namelen;
  198                         NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
  199                             dnp->n_fhp->nfh_len);
  200                         NFSBCOPY(cnp->cn_nameptr, NFS4NODENAME(np->n_v4),
  201                             cnp->cn_namelen);
  202                     }
  203                     NFSUNLOCKNODE(np);
  204                 }
  205                 if (newd != NULL)
  206                         FREE((caddr_t)newd, M_NFSV4NODE);
  207                 if (oldd != NULL)
  208                         FREE((caddr_t)oldd, M_NFSV4NODE);
  209                 *npp = np;
  210                 FREE((caddr_t)nfhp, M_NFSFH);
  211                 return (0);
  212         }
  213         np = uma_zalloc(newnfsnode_zone, M_WAITOK | M_ZERO);
  214 
  215         error = getnewvnode(nfs_vnode_tag, mntp, &newnfs_vnodeops, &nvp);
  216         if (error) {
  217                 uma_zfree(newnfsnode_zone, np);
  218                 FREE((caddr_t)nfhp, M_NFSFH);
  219                 return (error);
  220         }
  221         vp = nvp;
  222         KASSERT(vp->v_bufobj.bo_bsize != 0, ("nfscl_nget: bo_bsize == 0"));
  223         vp->v_bufobj.bo_ops = &buf_ops_newnfs;
  224         vp->v_data = np;
  225         np->n_vnode = vp;
  226         /* 
  227          * Initialize the mutex even if the vnode is going to be a loser.
  228          * This simplifies the logic in reclaim, which can then unconditionally
  229          * destroy the mutex (in the case of the loser, or if hash_insert
  230          * happened to return an error no special casing is needed).
  231          */
  232         mtx_init(&np->n_mtx, "NEWNFSnode lock", NULL, MTX_DEF | MTX_DUPOK);
  233 
  234         /* 
  235          * Are we getting the root? If so, make sure the vnode flags
  236          * are correct 
  237          */
  238         if ((nfhp->nfh_len == nmp->nm_fhsize) &&
  239             !bcmp(nfhp->nfh_fh, nmp->nm_fh, nfhp->nfh_len)) {
  240                 if (vp->v_type == VNON)
  241                         vp->v_type = VDIR;
  242                 vp->v_vflag |= VV_ROOT;
  243         }
  244         
  245         np->n_fhp = nfhp;
  246         /*
  247          * For NFSv4, we have to attach the directory file handle and
  248          * file name, so that Open Ops can be done later.
  249          */
  250         if (nmp->nm_flag & NFSMNT_NFSV4) {
  251                 MALLOC(np->n_v4, struct nfsv4node *, sizeof (struct nfsv4node)
  252                     + dnp->n_fhp->nfh_len + cnp->cn_namelen - 1, M_NFSV4NODE,
  253                     M_WAITOK);
  254                 np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len;
  255                 np->n_v4->n4_namelen = cnp->cn_namelen;
  256                 NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
  257                     dnp->n_fhp->nfh_len);
  258                 NFSBCOPY(cnp->cn_nameptr, NFS4NODENAME(np->n_v4),
  259                     cnp->cn_namelen);
  260         } else {
  261                 np->n_v4 = NULL;
  262         }
  263 
  264         /*
  265          * NFS supports recursive and shared locking.
  266          */
  267         lockmgr(vp->v_vnlock, LK_EXCLUSIVE | LK_NOWITNESS, NULL);
  268         VN_LOCK_AREC(vp);
  269         VN_LOCK_ASHARE(vp);
  270         error = insmntque(vp, mntp);
  271         if (error != 0) {
  272                 *npp = NULL;
  273                 mtx_destroy(&np->n_mtx);
  274                 FREE((caddr_t)nfhp, M_NFSFH);
  275                 if (np->n_v4 != NULL)
  276                         FREE((caddr_t)np->n_v4, M_NFSV4NODE);
  277                 uma_zfree(newnfsnode_zone, np);
  278                 return (error);
  279         }
  280         error = vfs_hash_insert(vp, hash, lkflags, 
  281             td, &nvp, newnfs_vncmpf, nfhp);
  282         if (error)
  283                 return (error);
  284         if (nvp != NULL) {
  285                 *npp = VTONFS(nvp);
  286                 /* vfs_hash_insert() vput()'s the losing vnode */
  287                 return (0);
  288         }
  289         *npp = np;
  290 
  291         return (0);
  292 }
  293 
  294 /*
  295  * Another variant of nfs_nget(). This one is only used by reopen. It
  296  * takes almost the same args as nfs_nget(), but only succeeds if an entry
  297  * exists in the cache. (Since files should already be "open" with a
  298  * vnode ref cnt on the node when reopen calls this, it should always
  299  * succeed.)
  300  * Also, don't get a vnode lock, since it may already be locked by some
  301  * other process that is handling it. This is ok, since all other threads
  302  * on the client are blocked by the nfsc_lock being exclusively held by the
  303  * caller of this function.
  304  */
  305 int
  306 nfscl_ngetreopen(struct mount *mntp, u_int8_t *fhp, int fhsize,
  307     struct thread *td, struct nfsnode **npp)
  308 {
  309         struct vnode *nvp;
  310         u_int hash;
  311         struct nfsfh *nfhp;
  312         int error;
  313 
  314         *npp = NULL;
  315         /* For forced dismounts, just return error. */
  316         if ((mntp->mnt_kern_flag & MNTK_UNMOUNTF))
  317                 return (EINTR);
  318         MALLOC(nfhp, struct nfsfh *, sizeof (struct nfsfh) + fhsize,
  319             M_NFSFH, M_WAITOK);
  320         bcopy(fhp, &nfhp->nfh_fh[0], fhsize);
  321         nfhp->nfh_len = fhsize;
  322 
  323         hash = fnv_32_buf(fhp, fhsize, FNV1_32_INIT);
  324 
  325         /*
  326          * First, try to get the vnode locked, but don't block for the lock.
  327          */
  328         error = vfs_hash_get(mntp, hash, (LK_EXCLUSIVE | LK_NOWAIT), td, &nvp,
  329             newnfs_vncmpf, nfhp);
  330         if (error == 0 && nvp != NULL) {
  331                 NFSVOPUNLOCK(nvp, 0);
  332         } else if (error == EBUSY) {
  333                 /*
  334                  * It is safe so long as a vflush() with
  335                  * FORCECLOSE has not been done. Since the Renew thread is
  336                  * stopped and the MNTK_UNMOUNTF flag is set before doing
  337                  * a vflush() with FORCECLOSE, we should be ok here.
  338                  */
  339                 if ((mntp->mnt_kern_flag & MNTK_UNMOUNTF))
  340                         error = EINTR;
  341                 else {
  342                         vfs_hash_ref(mntp, hash, td, &nvp, newnfs_vncmpf, nfhp);
  343                         if (nvp == NULL) {
  344                                 error = ENOENT;
  345                         } else if ((nvp->v_iflag & VI_DOOMED) != 0) {
  346                                 error = ENOENT;
  347                                 vrele(nvp);
  348                         } else {
  349                                 error = 0;
  350                         }
  351                 }
  352         }
  353         FREE(nfhp, M_NFSFH);
  354         if (error)
  355                 return (error);
  356         if (nvp != NULL) {
  357                 *npp = VTONFS(nvp);
  358                 return (0);
  359         }
  360         return (EINVAL);
  361 }
  362 
  363 static void
  364 nfscl_warn_fileid(struct nfsmount *nmp, struct nfsvattr *oldnap,
  365     struct nfsvattr *newnap)
  366 {
  367         int off;
  368 
  369         if (ncl_fileid_maxwarnings >= 0 &&
  370             ncl_fileid_nwarnings >= ncl_fileid_maxwarnings)
  371                 return;
  372         off = 0;
  373         if (ncl_fileid_maxwarnings >= 0) {
  374                 if (++ncl_fileid_nwarnings >= ncl_fileid_maxwarnings)
  375                         off = 1;
  376         }
  377 
  378         printf("newnfs: server '%s' error: fileid changed. "
  379             "fsid %jx:%jx: expected fileid %#jx, got %#jx. "
  380             "(BROKEN NFS SERVER OR MIDDLEWARE)\n",
  381             nmp->nm_com.nmcom_hostname,
  382             (uintmax_t)nmp->nm_fsid[0],
  383             (uintmax_t)nmp->nm_fsid[1],
  384             (uintmax_t)oldnap->na_fileid,
  385             (uintmax_t)newnap->na_fileid);
  386 
  387         if (off)
  388                 printf("newnfs: Logged %d times about fileid corruption; "
  389                     "going quiet to avoid spamming logs excessively. (Limit "
  390                     "is: %d).\n", ncl_fileid_nwarnings,
  391                     ncl_fileid_maxwarnings);
  392 }
  393 
  394 /*
  395  * Load the attribute cache (that lives in the nfsnode entry) with
  396  * the attributes of the second argument and
  397  * Iff vaper not NULL
  398  *    copy the attributes to *vaper
  399  * Similar to nfs_loadattrcache(), except the attributes are passed in
  400  * instead of being parsed out of the mbuf list.
  401  */
  402 int
  403 nfscl_loadattrcache(struct vnode **vpp, struct nfsvattr *nap, void *nvaper,
  404     void *stuff, int writeattr, int dontshrink)
  405 {
  406         struct vnode *vp = *vpp;
  407         struct vattr *vap, *nvap = &nap->na_vattr, *vaper = nvaper;
  408         struct nfsnode *np;
  409         struct nfsmount *nmp;
  410         struct timespec mtime_save;
  411         u_quad_t nsize;
  412         int setnsize, error, force_fid_err;
  413 
  414         error = 0;
  415         setnsize = 0;
  416         nsize = 0;
  417 
  418         /*
  419          * If v_type == VNON it is a new node, so fill in the v_type,
  420          * n_mtime fields. Check to see if it represents a special 
  421          * device, and if so, check for a possible alias. Once the
  422          * correct vnode has been obtained, fill in the rest of the
  423          * information.
  424          */
  425         np = VTONFS(vp);
  426         NFSLOCKNODE(np);
  427         if (vp->v_type != nvap->va_type) {
  428                 vp->v_type = nvap->va_type;
  429                 if (vp->v_type == VFIFO)
  430                         vp->v_op = &newnfs_fifoops;
  431                 np->n_mtime = nvap->va_mtime;
  432         }
  433         nmp = VFSTONFS(vp->v_mount);
  434         vap = &np->n_vattr.na_vattr;
  435         mtime_save = vap->va_mtime;
  436         if (writeattr) {
  437                 np->n_vattr.na_filerev = nap->na_filerev;
  438                 np->n_vattr.na_size = nap->na_size;
  439                 np->n_vattr.na_mtime = nap->na_mtime;
  440                 np->n_vattr.na_ctime = nap->na_ctime;
  441                 np->n_vattr.na_fsid = nap->na_fsid;
  442                 np->n_vattr.na_mode = nap->na_mode;
  443         } else {
  444                 force_fid_err = 0;
  445                 KFAIL_POINT_ERROR(DEBUG_FP, nfscl_force_fileid_warning,
  446                     force_fid_err);
  447                 /*
  448                  * BROKEN NFS SERVER OR MIDDLEWARE
  449                  *
  450                  * Certain NFS servers (certain old proprietary filers ca.
  451                  * 2006) or broken middleboxes (e.g. WAN accelerator products)
  452                  * will respond to GETATTR requests with results for a
  453                  * different fileid.
  454                  *
  455                  * The WAN accelerator we've observed not only serves stale
  456                  * cache results for a given file, it also occasionally serves
  457                  * results for wholly different files.  This causes surprising
  458                  * problems; for example the cached size attribute of a file
  459                  * may truncate down and then back up, resulting in zero
  460                  * regions in file contents read by applications.  We observed
  461                  * this reliably with Clang and .c files during parallel build.
  462                  * A pcap revealed packet fragmentation and GETATTR RPC
  463                  * responses with wholly wrong fileids.
  464                  */
  465                 if ((np->n_vattr.na_fileid != 0 &&
  466                      np->n_vattr.na_fileid != nap->na_fileid) ||
  467                     force_fid_err) {
  468                         nfscl_warn_fileid(nmp, &np->n_vattr, nap);
  469                         error = EIDRM;
  470                         goto out;
  471                 }
  472                 NFSBCOPY((caddr_t)nap, (caddr_t)&np->n_vattr,
  473                     sizeof (struct nfsvattr));
  474         }
  475 
  476         /*
  477          * For NFSv4, if the node's fsid is not equal to the mount point's
  478          * fsid, return the low order 32bits of the node's fsid. This
  479          * allows getcwd(3) to work. There is a chance that the fsid might
  480          * be the same as a local fs, but since this is in an NFS mount
  481          * point, I don't think that will cause any problems?
  482          */
  483         if (NFSHASNFSV4(nmp) && NFSHASHASSETFSID(nmp) &&
  484             (nmp->nm_fsid[0] != np->n_vattr.na_filesid[0] ||
  485              nmp->nm_fsid[1] != np->n_vattr.na_filesid[1])) {
  486                 /*
  487                  * va_fsid needs to be set to some value derived from
  488                  * np->n_vattr.na_filesid that is not equal
  489                  * vp->v_mount->mnt_stat.f_fsid[0], so that it changes
  490                  * from the value used for the top level server volume
  491                  * in the mounted subtree.
  492                  */
  493                 if (vp->v_mount->mnt_stat.f_fsid.val[0] !=
  494                     (uint32_t)np->n_vattr.na_filesid[0])
  495                         vap->va_fsid = (uint32_t)np->n_vattr.na_filesid[0];
  496                 else
  497                         vap->va_fsid = (uint32_t)hash32_buf(
  498                             np->n_vattr.na_filesid, 2 * sizeof(uint64_t), 0);
  499         } else
  500                 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
  501         np->n_attrstamp = time_second;
  502         if (vap->va_size != np->n_size) {
  503                 if (vap->va_type == VREG) {
  504                         if (dontshrink && vap->va_size < np->n_size) {
  505                                 /*
  506                                  * We've been told not to shrink the file;
  507                                  * zero np->n_attrstamp to indicate that
  508                                  * the attributes are stale.
  509                                  */
  510                                 vap->va_size = np->n_size;
  511                                 np->n_attrstamp = 0;
  512                                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
  513                                 vnode_pager_setsize(vp, np->n_size);
  514                         } else if (np->n_flag & NMODIFIED) {
  515                                 /*
  516                                  * We've modified the file: Use the larger
  517                                  * of our size, and the server's size.
  518                                  */
  519                                 if (vap->va_size < np->n_size) {
  520                                         vap->va_size = np->n_size;
  521                                 } else {
  522                                         np->n_size = vap->va_size;
  523                                         np->n_flag |= NSIZECHANGED;
  524                                 }
  525                                 vnode_pager_setsize(vp, np->n_size);
  526                         } else if (vap->va_size < np->n_size) {
  527                                 /*
  528                                  * When shrinking the size, the call to
  529                                  * vnode_pager_setsize() cannot be done
  530                                  * with the mutex held, so delay it until
  531                                  * after the mtx_unlock call.
  532                                  */
  533                                 nsize = np->n_size = vap->va_size;
  534                                 np->n_flag |= NSIZECHANGED;
  535                                 setnsize = 1;
  536                         } else {
  537                                 np->n_size = vap->va_size;
  538                                 np->n_flag |= NSIZECHANGED;
  539                                 vnode_pager_setsize(vp, np->n_size);
  540                         }
  541                 } else {
  542                         np->n_size = vap->va_size;
  543                 }
  544         }
  545         /*
  546          * The following checks are added to prevent a race between (say)
  547          * a READDIR+ and a WRITE. 
  548          * READDIR+, WRITE requests sent out.
  549          * READDIR+ resp, WRITE resp received on client.
  550          * However, the WRITE resp was handled before the READDIR+ resp
  551          * causing the post op attrs from the write to be loaded first
  552          * and the attrs from the READDIR+ to be loaded later. If this 
  553          * happens, we have stale attrs loaded into the attrcache.
  554          * We detect this by for the mtime moving back. We invalidate the 
  555          * attrcache when this happens.
  556          */
  557         if (timespeccmp(&mtime_save, &vap->va_mtime, >)) {
  558                 /* Size changed or mtime went backwards */
  559                 np->n_attrstamp = 0;
  560                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
  561         }
  562         if (vaper != NULL) {
  563                 NFSBCOPY((caddr_t)vap, (caddr_t)vaper, sizeof(*vap));
  564                 if (np->n_flag & NCHG) {
  565                         if (np->n_flag & NACC)
  566                                 vaper->va_atime = np->n_atim;
  567                         if (np->n_flag & NUPD)
  568                                 vaper->va_mtime = np->n_mtim;
  569                 }
  570         }
  571 
  572 out:
  573 #ifdef KDTRACE_HOOKS
  574         if (np->n_attrstamp != 0)
  575                 KDTRACE_NFS_ATTRCACHE_LOAD_DONE(vp, vap, error);
  576 #endif
  577         NFSUNLOCKNODE(np);
  578         if (setnsize)
  579                 vnode_pager_setsize(vp, nsize);
  580         return (error);
  581 }
  582 
  583 /*
  584  * Fill in the client id name. For these bytes:
  585  * 1 - they must be unique
  586  * 2 - they should be persistent across client reboots
  587  * 1 is more critical than 2
  588  * Use the mount point's unique id plus either the uuid or, if that
  589  * isn't set, random junk.
  590  */
  591 void
  592 nfscl_fillclid(u_int64_t clval, char *uuid, u_int8_t *cp, u_int16_t idlen)
  593 {
  594         int uuidlen;
  595 
  596         /*
  597          * First, put in the 64bit mount point identifier.
  598          */
  599         if (idlen >= sizeof (u_int64_t)) {
  600                 NFSBCOPY((caddr_t)&clval, cp, sizeof (u_int64_t));
  601                 cp += sizeof (u_int64_t);
  602                 idlen -= sizeof (u_int64_t);
  603         }
  604 
  605         /*
  606          * If uuid is non-zero length, use it.
  607          */
  608         uuidlen = strlen(uuid);
  609         if (uuidlen > 0 && idlen >= uuidlen) {
  610                 NFSBCOPY(uuid, cp, uuidlen);
  611                 cp += uuidlen;
  612                 idlen -= uuidlen;
  613         }
  614 
  615         /*
  616          * This only normally happens if the uuid isn't set.
  617          */
  618         while (idlen > 0) {
  619                 *cp++ = (u_int8_t)(arc4random() % 256);
  620                 idlen--;
  621         }
  622 }
  623 
  624 /*
  625  * Fill in a lock owner name. For now, pid + the process's creation time.
  626  */
  627 void
  628 nfscl_filllockowner(void *id, u_int8_t *cp, int flags)
  629 {
  630         union {
  631                 u_int32_t       lval;
  632                 u_int8_t        cval[4];
  633         } tl;
  634         struct proc *p;
  635 
  636         if (id == NULL) {
  637                 /* Return the single open_owner of all 0 bytes. */
  638                 bzero(cp, NFSV4CL_LOCKNAMELEN);
  639                 return;
  640         }
  641         if ((flags & F_POSIX) != 0) {
  642                 p = (struct proc *)id;
  643                 tl.lval = p->p_pid;
  644                 *cp++ = tl.cval[0];
  645                 *cp++ = tl.cval[1];
  646                 *cp++ = tl.cval[2];
  647                 *cp++ = tl.cval[3];
  648                 tl.lval = p->p_stats->p_start.tv_sec;
  649                 *cp++ = tl.cval[0];
  650                 *cp++ = tl.cval[1];
  651                 *cp++ = tl.cval[2];
  652                 *cp++ = tl.cval[3];
  653                 tl.lval = p->p_stats->p_start.tv_usec;
  654                 *cp++ = tl.cval[0];
  655                 *cp++ = tl.cval[1];
  656                 *cp++ = tl.cval[2];
  657                 *cp = tl.cval[3];
  658         } else if ((flags & F_FLOCK) != 0) {
  659                 bcopy(&id, cp, sizeof(id));
  660                 bzero(&cp[sizeof(id)], NFSV4CL_LOCKNAMELEN - sizeof(id));
  661         } else {
  662                 printf("nfscl_filllockowner: not F_POSIX or F_FLOCK\n");
  663                 bzero(cp, NFSV4CL_LOCKNAMELEN);
  664         }
  665 }
  666 
  667 /*
  668  * Find the parent process for the thread passed in as an argument.
  669  * If none exists, return NULL, otherwise return a thread for the parent.
  670  * (Can be any of the threads, since it is only used for td->td_proc.)
  671  */
  672 NFSPROC_T *
  673 nfscl_getparent(struct thread *td)
  674 {
  675         struct proc *p;
  676         struct thread *ptd;
  677 
  678         if (td == NULL)
  679                 return (NULL);
  680         p = td->td_proc;
  681         if (p->p_pid == 0)
  682                 return (NULL);
  683         p = p->p_pptr;
  684         if (p == NULL)
  685                 return (NULL);
  686         ptd = TAILQ_FIRST(&p->p_threads);
  687         return (ptd);
  688 }
  689 
  690 /*
  691  * Start up the renew kernel thread.
  692  */
  693 static void
  694 start_nfscl(void *arg)
  695 {
  696         struct nfsclclient *clp;
  697         struct thread *td;
  698 
  699         clp = (struct nfsclclient *)arg;
  700         td = TAILQ_FIRST(&clp->nfsc_renewthread->p_threads);
  701         nfscl_renewthread(clp, td);
  702         kproc_exit(0);
  703 }
  704 
  705 void
  706 nfscl_start_renewthread(struct nfsclclient *clp)
  707 {
  708 
  709         kproc_create(start_nfscl, (void *)clp, &clp->nfsc_renewthread, 0, 0,
  710             "nfscl");
  711 }
  712 
  713 /*
  714  * Handle wcc_data.
  715  * For NFSv4, it assumes that nfsv4_wccattr() was used to set up the getattr
  716  * as the first Op after PutFH.
  717  * (For NFSv4, the postop attributes are after the Op, so they can't be
  718  *  parsed here. A separate call to nfscl_postop_attr() is required.)
  719  */
  720 int
  721 nfscl_wcc_data(struct nfsrv_descript *nd, struct vnode *vp,
  722     struct nfsvattr *nap, int *flagp, int *wccflagp, void *stuff)
  723 {
  724         u_int32_t *tl;
  725         struct nfsnode *np = VTONFS(vp);
  726         struct nfsvattr nfsva;
  727         int error = 0;
  728 
  729         if (wccflagp != NULL)
  730                 *wccflagp = 0;
  731         if (nd->nd_flag & ND_NFSV3) {
  732                 *flagp = 0;
  733                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
  734                 if (*tl == newnfs_true) {
  735                         NFSM_DISSECT(tl, u_int32_t *, 6 * NFSX_UNSIGNED);
  736                         if (wccflagp != NULL) {
  737                                 mtx_lock(&np->n_mtx);
  738                                 *wccflagp = (np->n_mtime.tv_sec ==
  739                                     fxdr_unsigned(u_int32_t, *(tl + 2)) &&
  740                                     np->n_mtime.tv_nsec ==
  741                                     fxdr_unsigned(u_int32_t, *(tl + 3)));
  742                                 mtx_unlock(&np->n_mtx);
  743                         }
  744                 }
  745                 error = nfscl_postop_attr(nd, nap, flagp, stuff);
  746         } else if ((nd->nd_flag & (ND_NOMOREDATA | ND_NFSV4 | ND_V4WCCATTR))
  747             == (ND_NFSV4 | ND_V4WCCATTR)) {
  748                 error = nfsv4_loadattr(nd, NULL, &nfsva, NULL,
  749                     NULL, 0, NULL, NULL, NULL, NULL, NULL, 0,
  750                     NULL, NULL, NULL, NULL, NULL);
  751                 if (error)
  752                         return (error);
  753                 /*
  754                  * Get rid of Op# and status for next op.
  755                  */
  756                 NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
  757                 if (*++tl)
  758                         nd->nd_flag |= ND_NOMOREDATA;
  759                 if (wccflagp != NULL &&
  760                     nfsva.na_vattr.va_mtime.tv_sec != 0) {
  761                         mtx_lock(&np->n_mtx);
  762                         *wccflagp = (np->n_mtime.tv_sec ==
  763                             nfsva.na_vattr.va_mtime.tv_sec &&
  764                             np->n_mtime.tv_nsec ==
  765                             nfsva.na_vattr.va_mtime.tv_sec);
  766                         mtx_unlock(&np->n_mtx);
  767                 }
  768         }
  769 nfsmout:
  770         return (error);
  771 }
  772 
  773 /*
  774  * Get postop attributes.
  775  */
  776 int
  777 nfscl_postop_attr(struct nfsrv_descript *nd, struct nfsvattr *nap, int *retp,
  778     void *stuff)
  779 {
  780         u_int32_t *tl;
  781         int error = 0;
  782 
  783         *retp = 0;
  784         if (nd->nd_flag & ND_NOMOREDATA)
  785                 return (error);
  786         if (nd->nd_flag & ND_NFSV3) {
  787                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
  788                 *retp = fxdr_unsigned(int, *tl);
  789         } else if (nd->nd_flag & ND_NFSV4) {
  790                 /*
  791                  * For NFSv4, the postop attr are at the end, so no point
  792                  * in looking if nd_repstat != 0.
  793                  */
  794                 if (!nd->nd_repstat) {
  795                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
  796                         if (*(tl + 1))
  797                                 /* should never happen since nd_repstat != 0 */
  798                                 nd->nd_flag |= ND_NOMOREDATA;
  799                         else
  800                                 *retp = 1;
  801                 }
  802         } else if (!nd->nd_repstat) {
  803                 /* For NFSv2, the attributes are here iff nd_repstat == 0 */
  804                 *retp = 1;
  805         }
  806         if (*retp) {
  807                 error = nfsm_loadattr(nd, nap);
  808                 if (error)
  809                         *retp = 0;
  810         }
  811 nfsmout:
  812         return (error);
  813 }
  814 
  815 /*
  816  * Fill in the setable attributes. The full argument indicates whether
  817  * to fill in them all or just mode and time.
  818  */
  819 void
  820 nfscl_fillsattr(struct nfsrv_descript *nd, struct vattr *vap,
  821     struct vnode *vp, int flags, u_int32_t rdev)
  822 {
  823         u_int32_t *tl;
  824         struct nfsv2_sattr *sp;
  825         nfsattrbit_t attrbits;
  826 
  827         switch (nd->nd_flag & (ND_NFSV2 | ND_NFSV3 | ND_NFSV4)) {
  828         case ND_NFSV2:
  829                 NFSM_BUILD(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
  830                 if (vap->va_mode == (mode_t)VNOVAL)
  831                         sp->sa_mode = newnfs_xdrneg1;
  832                 else
  833                         sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode);
  834                 if (vap->va_uid == (uid_t)VNOVAL)
  835                         sp->sa_uid = newnfs_xdrneg1;
  836                 else
  837                         sp->sa_uid = txdr_unsigned(vap->va_uid);
  838                 if (vap->va_gid == (gid_t)VNOVAL)
  839                         sp->sa_gid = newnfs_xdrneg1;
  840                 else
  841                         sp->sa_gid = txdr_unsigned(vap->va_gid);
  842                 if (flags & NFSSATTR_SIZE0)
  843                         sp->sa_size = 0;
  844                 else if (flags & NFSSATTR_SIZENEG1)
  845                         sp->sa_size = newnfs_xdrneg1;
  846                 else if (flags & NFSSATTR_SIZERDEV)
  847                         sp->sa_size = txdr_unsigned(rdev);
  848                 else
  849                         sp->sa_size = txdr_unsigned(vap->va_size);
  850                 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
  851                 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
  852                 break;
  853         case ND_NFSV3:
  854                 if (vap->va_mode != (mode_t)VNOVAL) {
  855                         NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
  856                         *tl++ = newnfs_true;
  857                         *tl = txdr_unsigned(vap->va_mode);
  858                 } else {
  859                         NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
  860                         *tl = newnfs_false;
  861                 }
  862                 if ((flags & NFSSATTR_FULL) && vap->va_uid != (uid_t)VNOVAL) {
  863                         NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
  864                         *tl++ = newnfs_true;
  865                         *tl = txdr_unsigned(vap->va_uid);
  866                 } else {
  867                         NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
  868                         *tl = newnfs_false;
  869                 }
  870                 if ((flags & NFSSATTR_FULL) && vap->va_gid != (gid_t)VNOVAL) {
  871                         NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
  872                         *tl++ = newnfs_true;
  873                         *tl = txdr_unsigned(vap->va_gid);
  874                 } else {
  875                         NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
  876                         *tl = newnfs_false;
  877                 }
  878                 if ((flags & NFSSATTR_FULL) && vap->va_size != VNOVAL) {
  879                         NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
  880                         *tl++ = newnfs_true;
  881                         txdr_hyper(vap->va_size, tl);
  882                 } else {
  883                         NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
  884                         *tl = newnfs_false;
  885                 }
  886                 if (vap->va_atime.tv_sec != VNOVAL) {
  887                         if ((vap->va_vaflags & VA_UTIMES_NULL) == 0) {
  888                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
  889                                 *tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT);
  890                                 txdr_nfsv3time(&vap->va_atime, tl);
  891                         } else {
  892                                 NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
  893                                 *tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER);
  894                         }
  895                 } else {
  896                         NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
  897                         *tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE);
  898                 }
  899                 if (vap->va_mtime.tv_sec != VNOVAL) {
  900                         if ((vap->va_vaflags & VA_UTIMES_NULL) == 0) {
  901                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
  902                                 *tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT);
  903                                 txdr_nfsv3time(&vap->va_mtime, tl);
  904                         } else {
  905                                 NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
  906                                 *tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER);
  907                         }
  908                 } else {
  909                         NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
  910                         *tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE);
  911                 }
  912                 break;
  913         case ND_NFSV4:
  914                 NFSZERO_ATTRBIT(&attrbits);
  915                 if (vap->va_mode != (mode_t)VNOVAL)
  916                         NFSSETBIT_ATTRBIT(&attrbits, NFSATTRBIT_MODE);
  917                 if ((flags & NFSSATTR_FULL) && vap->va_uid != (uid_t)VNOVAL)
  918                         NFSSETBIT_ATTRBIT(&attrbits, NFSATTRBIT_OWNER);
  919                 if ((flags & NFSSATTR_FULL) && vap->va_gid != (gid_t)VNOVAL)
  920                         NFSSETBIT_ATTRBIT(&attrbits, NFSATTRBIT_OWNERGROUP);
  921                 if ((flags & NFSSATTR_FULL) && vap->va_size != VNOVAL)
  922                         NFSSETBIT_ATTRBIT(&attrbits, NFSATTRBIT_SIZE);
  923                 if (vap->va_atime.tv_sec != VNOVAL)
  924                         NFSSETBIT_ATTRBIT(&attrbits, NFSATTRBIT_TIMEACCESSSET);
  925                 if (vap->va_mtime.tv_sec != VNOVAL)
  926                         NFSSETBIT_ATTRBIT(&attrbits, NFSATTRBIT_TIMEMODIFYSET);
  927                 (void) nfsv4_fillattr(nd, vp->v_mount, vp, NULL, vap, NULL, 0,
  928                     &attrbits, NULL, NULL, 0, 0, 0, 0, (uint64_t)0);
  929                 break;
  930         }
  931 }
  932 
  933 /*
  934  * nfscl_request() - mostly a wrapper for newnfs_request().
  935  */
  936 int
  937 nfscl_request(struct nfsrv_descript *nd, struct vnode *vp, NFSPROC_T *p,
  938     struct ucred *cred, void *stuff)
  939 {
  940         int ret, vers;
  941         struct nfsmount *nmp;
  942 
  943         nmp = VFSTONFS(vp->v_mount);
  944         if (nd->nd_flag & ND_NFSV4)
  945                 vers = NFS_VER4;
  946         else if (nd->nd_flag & ND_NFSV3)
  947                 vers = NFS_VER3;
  948         else
  949                 vers = NFS_VER2;
  950         ret = newnfs_request(nd, nmp, NULL, &nmp->nm_sockreq, vp, p, cred,
  951                 NFS_PROG, vers, NULL, 1, NULL, NULL);
  952         return (ret);
  953 }
  954 
  955 /*
  956  * fill in this bsden's variant of statfs using nfsstatfs.
  957  */
  958 void
  959 nfscl_loadsbinfo(struct nfsmount *nmp, struct nfsstatfs *sfp, void *statfs)
  960 {
  961         struct statfs *sbp = (struct statfs *)statfs;
  962 
  963         if (nmp->nm_flag & (NFSMNT_NFSV3 | NFSMNT_NFSV4)) {
  964                 sbp->f_bsize = NFS_FABLKSIZE;
  965                 sbp->f_blocks = sfp->sf_tbytes / NFS_FABLKSIZE;
  966                 sbp->f_bfree = sfp->sf_fbytes / NFS_FABLKSIZE;
  967                 /*
  968                  * Although sf_abytes is uint64_t and f_bavail is int64_t,
  969                  * the value after dividing by NFS_FABLKSIZE is small
  970                  * enough that it will fit in 63bits, so it is ok to
  971                  * assign it to f_bavail without fear that it will become
  972                  * negative.
  973                  */
  974                 sbp->f_bavail = sfp->sf_abytes / NFS_FABLKSIZE;
  975                 sbp->f_files = sfp->sf_tfiles;
  976                 /* Since f_ffree is int64_t, clip it to 63bits. */
  977                 if (sfp->sf_ffiles > INT64_MAX)
  978                         sbp->f_ffree = INT64_MAX;
  979                 else
  980                         sbp->f_ffree = sfp->sf_ffiles;
  981         } else if ((nmp->nm_flag & NFSMNT_NFSV4) == 0) {
  982                 /*
  983                  * The type casts to (int32_t) ensure that this code is
  984                  * compatible with the old NFS client, in that it will
  985                  * propagate bit31 to the high order bits. This may or may
  986                  * not be correct for NFSv2, but since it is a legacy
  987                  * environment, I'd rather retain backwards compatibility.
  988                  */
  989                 sbp->f_bsize = (int32_t)sfp->sf_bsize;
  990                 sbp->f_blocks = (int32_t)sfp->sf_blocks;
  991                 sbp->f_bfree = (int32_t)sfp->sf_bfree;
  992                 sbp->f_bavail = (int32_t)sfp->sf_bavail;
  993                 sbp->f_files = 0;
  994                 sbp->f_ffree = 0;
  995         }
  996 }
  997 
  998 /*
  999  * Use the fsinfo stuff to update the mount point.
 1000  */
 1001 void
 1002 nfscl_loadfsinfo(struct nfsmount *nmp, struct nfsfsinfo *fsp)
 1003 {
 1004 
 1005         if ((nmp->nm_wsize == 0 || fsp->fs_wtpref < nmp->nm_wsize) &&
 1006             fsp->fs_wtpref >= NFS_FABLKSIZE)
 1007                 nmp->nm_wsize = (fsp->fs_wtpref + NFS_FABLKSIZE - 1) &
 1008                     ~(NFS_FABLKSIZE - 1);
 1009         if (fsp->fs_wtmax < nmp->nm_wsize && fsp->fs_wtmax > 0) {
 1010                 nmp->nm_wsize = fsp->fs_wtmax & ~(NFS_FABLKSIZE - 1);
 1011                 if (nmp->nm_wsize == 0)
 1012                         nmp->nm_wsize = fsp->fs_wtmax;
 1013         }
 1014         if (nmp->nm_wsize < NFS_FABLKSIZE)
 1015                 nmp->nm_wsize = NFS_FABLKSIZE;
 1016         if ((nmp->nm_rsize == 0 || fsp->fs_rtpref < nmp->nm_rsize) &&
 1017             fsp->fs_rtpref >= NFS_FABLKSIZE)
 1018                 nmp->nm_rsize = (fsp->fs_rtpref + NFS_FABLKSIZE - 1) &
 1019                     ~(NFS_FABLKSIZE - 1);
 1020         if (fsp->fs_rtmax < nmp->nm_rsize && fsp->fs_rtmax > 0) {
 1021                 nmp->nm_rsize = fsp->fs_rtmax & ~(NFS_FABLKSIZE - 1);
 1022                 if (nmp->nm_rsize == 0)
 1023                         nmp->nm_rsize = fsp->fs_rtmax;
 1024         }
 1025         if (nmp->nm_rsize < NFS_FABLKSIZE)
 1026                 nmp->nm_rsize = NFS_FABLKSIZE;
 1027         if ((nmp->nm_readdirsize == 0 || fsp->fs_dtpref < nmp->nm_readdirsize)
 1028             && fsp->fs_dtpref >= NFS_DIRBLKSIZ)
 1029                 nmp->nm_readdirsize = (fsp->fs_dtpref + NFS_DIRBLKSIZ - 1) &
 1030                     ~(NFS_DIRBLKSIZ - 1);
 1031         if (fsp->fs_rtmax < nmp->nm_readdirsize && fsp->fs_rtmax > 0) {
 1032                 nmp->nm_readdirsize = fsp->fs_rtmax & ~(NFS_DIRBLKSIZ - 1);
 1033                 if (nmp->nm_readdirsize == 0)
 1034                         nmp->nm_readdirsize = fsp->fs_rtmax;
 1035         }
 1036         if (nmp->nm_readdirsize < NFS_DIRBLKSIZ)
 1037                 nmp->nm_readdirsize = NFS_DIRBLKSIZ;
 1038         if (fsp->fs_maxfilesize > 0 &&
 1039             fsp->fs_maxfilesize < nmp->nm_maxfilesize)
 1040                 nmp->nm_maxfilesize = fsp->fs_maxfilesize;
 1041         nmp->nm_mountp->mnt_stat.f_iosize = newnfs_iosize(nmp);
 1042         nmp->nm_state |= NFSSTA_GOTFSINFO;
 1043 }
 1044 
 1045 /*
 1046  * Lookups source address which should be used to communicate with
 1047  * @nmp and stores it inside @pdst.
 1048  *
 1049  * Returns 0 on success.
 1050  */
 1051 u_int8_t *
 1052 nfscl_getmyip(struct nfsmount *nmp, struct in6_addr *paddr, int *isinet6p)
 1053 {
 1054 #if defined(INET6) || defined(INET)
 1055         int error, fibnum;
 1056 
 1057         fibnum = curthread->td_proc->p_fibnum;
 1058 #endif
 1059 #ifdef INET
 1060         if (nmp->nm_nam->sa_family == AF_INET) {
 1061                 struct sockaddr_in *sin;
 1062                 struct nhop4_extended nh_ext;
 1063 
 1064                 sin = (struct sockaddr_in *)nmp->nm_nam;
 1065                 CURVNET_SET(CRED_TO_VNET(nmp->nm_sockreq.nr_cred));
 1066                 error = fib4_lookup_nh_ext(fibnum, sin->sin_addr, 0, 0,
 1067                     &nh_ext);
 1068                 CURVNET_RESTORE();
 1069                 if (error != 0)
 1070                         return (NULL);
 1071 
 1072                 if ((ntohl(nh_ext.nh_src.s_addr) >> IN_CLASSA_NSHIFT) ==
 1073                     IN_LOOPBACKNET) {
 1074                         /* Ignore loopback addresses */
 1075                         return (NULL);
 1076                 }
 1077 
 1078                 *isinet6p = 0;
 1079                 *((struct in_addr *)paddr) = nh_ext.nh_src;
 1080 
 1081                 return (u_int8_t *)paddr;
 1082         }
 1083 #endif
 1084 #ifdef INET6
 1085         if (nmp->nm_nam->sa_family == AF_INET6) {
 1086                 struct sockaddr_in6 *sin6;
 1087 
 1088                 sin6 = (struct sockaddr_in6 *)nmp->nm_nam;
 1089 
 1090                 CURVNET_SET(CRED_TO_VNET(nmp->nm_sockreq.nr_cred));
 1091                 error = in6_selectsrc_addr(fibnum, &sin6->sin6_addr,
 1092                     sin6->sin6_scope_id, NULL, paddr, NULL);
 1093                 CURVNET_RESTORE();
 1094                 if (error != 0)
 1095                         return (NULL);
 1096 
 1097                 if (IN6_IS_ADDR_LOOPBACK(paddr))
 1098                         return (NULL);
 1099 
 1100                 /* Scope is embedded in */
 1101                 *isinet6p = 1;
 1102 
 1103                 return (u_int8_t *)paddr;
 1104         }
 1105 #endif
 1106         return (NULL);
 1107 }
 1108 
 1109 /*
 1110  * Copy NFS uid, gids from the cred structure.
 1111  */
 1112 void
 1113 newnfs_copyincred(struct ucred *cr, struct nfscred *nfscr)
 1114 {
 1115         int i;
 1116 
 1117         KASSERT(cr->cr_ngroups >= 0,
 1118             ("newnfs_copyincred: negative cr_ngroups"));
 1119         nfscr->nfsc_uid = cr->cr_uid;
 1120         nfscr->nfsc_ngroups = MIN(cr->cr_ngroups, NFS_MAXGRPS + 1);
 1121         for (i = 0; i < nfscr->nfsc_ngroups; i++)
 1122                 nfscr->nfsc_groups[i] = cr->cr_groups[i];
 1123 }
 1124 
 1125 
 1126 /*
 1127  * Do any client specific initialization.
 1128  */
 1129 void
 1130 nfscl_init(void)
 1131 {
 1132         static int inited = 0;
 1133 
 1134         if (inited)
 1135                 return;
 1136         inited = 1;
 1137         nfscl_inited = 1;
 1138         ncl_pbuf_freecnt = nswbuf / 2 + 1;
 1139 }
 1140 
 1141 /*
 1142  * Check each of the attributes to be set, to ensure they aren't already
 1143  * the correct value. Disable setting ones already correct.
 1144  */
 1145 int
 1146 nfscl_checksattr(struct vattr *vap, struct nfsvattr *nvap)
 1147 {
 1148 
 1149         if (vap->va_mode != (mode_t)VNOVAL) {
 1150                 if (vap->va_mode == nvap->na_mode)
 1151                         vap->va_mode = (mode_t)VNOVAL;
 1152         }
 1153         if (vap->va_uid != (uid_t)VNOVAL) {
 1154                 if (vap->va_uid == nvap->na_uid)
 1155                         vap->va_uid = (uid_t)VNOVAL;
 1156         }
 1157         if (vap->va_gid != (gid_t)VNOVAL) {
 1158                 if (vap->va_gid == nvap->na_gid)
 1159                         vap->va_gid = (gid_t)VNOVAL;
 1160         }
 1161         if (vap->va_size != VNOVAL) {
 1162                 if (vap->va_size == nvap->na_size)
 1163                         vap->va_size = VNOVAL;
 1164         }
 1165 
 1166         /*
 1167          * We are normally called with only a partially initialized
 1168          * VAP.  Since the NFSv3 spec says that server may use the
 1169          * file attributes to store the verifier, the spec requires
 1170          * us to do a SETATTR RPC. FreeBSD servers store the verifier
 1171          * in atime, but we can't really assume that all servers will
 1172          * so we ensure that our SETATTR sets both atime and mtime.
 1173          * Set the VA_UTIMES_NULL flag for this case, so that
 1174          * the server's time will be used.  This is needed to
 1175          * work around a bug in some Solaris servers, where
 1176          * setting the time TOCLIENT causes the Setattr RPC
 1177          * to return NFS_OK, but not set va_mode.
 1178          */
 1179         if (vap->va_mtime.tv_sec == VNOVAL) {
 1180                 vfs_timestamp(&vap->va_mtime);
 1181                 vap->va_vaflags |= VA_UTIMES_NULL;
 1182         }
 1183         if (vap->va_atime.tv_sec == VNOVAL)
 1184                 vap->va_atime = vap->va_mtime;
 1185         return (1);
 1186 }
 1187 
 1188 /*
 1189  * Map nfsv4 errors to errno.h errors.
 1190  * The uid and gid arguments are only used for NFSERR_BADOWNER and that
 1191  * error should only be returned for the Open, Create and Setattr Ops.
 1192  * As such, most calls can just pass in 0 for those arguments.
 1193  */
 1194 APPLESTATIC int
 1195 nfscl_maperr(struct thread *td, int error, uid_t uid, gid_t gid)
 1196 {
 1197         struct proc *p;
 1198 
 1199         if (error < 10000 || error >= NFSERR_STALEWRITEVERF)
 1200                 return (error);
 1201         if (td != NULL)
 1202                 p = td->td_proc;
 1203         else
 1204                 p = NULL;
 1205         switch (error) {
 1206         case NFSERR_BADOWNER:
 1207                 tprintf(p, LOG_INFO,
 1208                     "No name and/or group mapping for uid,gid:(%d,%d)\n",
 1209                     uid, gid);
 1210                 return (EPERM);
 1211         case NFSERR_BADNAME:
 1212         case NFSERR_BADCHAR:
 1213                 printf("nfsv4 char/name not handled by server\n");
 1214                 return (ENOENT);
 1215         case NFSERR_STALECLIENTID:
 1216         case NFSERR_STALESTATEID:
 1217         case NFSERR_EXPIRED:
 1218         case NFSERR_BADSTATEID:
 1219         case NFSERR_BADSESSION:
 1220                 printf("nfsv4 recover err returned %d\n", error);
 1221                 return (EIO);
 1222         case NFSERR_BADHANDLE:
 1223         case NFSERR_SERVERFAULT:
 1224         case NFSERR_BADTYPE:
 1225         case NFSERR_FHEXPIRED:
 1226         case NFSERR_RESOURCE:
 1227         case NFSERR_MOVED:
 1228         case NFSERR_NOFILEHANDLE:
 1229         case NFSERR_MINORVERMISMATCH:
 1230         case NFSERR_OLDSTATEID:
 1231         case NFSERR_BADSEQID:
 1232         case NFSERR_LEASEMOVED:
 1233         case NFSERR_RECLAIMBAD:
 1234         case NFSERR_BADXDR:
 1235         case NFSERR_OPILLEGAL:
 1236                 printf("nfsv4 client/server protocol prob err=%d\n",
 1237                     error);
 1238                 return (EIO);
 1239         default:
 1240                 tprintf(p, LOG_INFO, "nfsv4 err=%d\n", error);
 1241                 return (EIO);
 1242         };
 1243 }
 1244 
 1245 /*
 1246  * Check to see if the process for this owner exists. Return 1 if it doesn't
 1247  * and 0 otherwise.
 1248  */
 1249 int
 1250 nfscl_procdoesntexist(u_int8_t *own)
 1251 {
 1252         union {
 1253                 u_int32_t       lval;
 1254                 u_int8_t        cval[4];
 1255         } tl;
 1256         struct proc *p;
 1257         pid_t pid;
 1258         int i, ret = 0;
 1259 
 1260         /* For the single open_owner of all 0 bytes, just return 0. */
 1261         for (i = 0; i < NFSV4CL_LOCKNAMELEN; i++)
 1262                 if (own[i] != 0)
 1263                         break;
 1264         if (i == NFSV4CL_LOCKNAMELEN)
 1265                 return (0);
 1266 
 1267         tl.cval[0] = *own++;
 1268         tl.cval[1] = *own++;
 1269         tl.cval[2] = *own++;
 1270         tl.cval[3] = *own++;
 1271         pid = tl.lval;
 1272         p = pfind_locked(pid);
 1273         if (p == NULL)
 1274                 return (1);
 1275         if (p->p_stats == NULL) {
 1276                 PROC_UNLOCK(p);
 1277                 return (0);
 1278         }
 1279         tl.cval[0] = *own++;
 1280         tl.cval[1] = *own++;
 1281         tl.cval[2] = *own++;
 1282         tl.cval[3] = *own++;
 1283         if (tl.lval != p->p_stats->p_start.tv_sec) {
 1284                 ret = 1;
 1285         } else {
 1286                 tl.cval[0] = *own++;
 1287                 tl.cval[1] = *own++;
 1288                 tl.cval[2] = *own++;
 1289                 tl.cval[3] = *own;
 1290                 if (tl.lval != p->p_stats->p_start.tv_usec)
 1291                         ret = 1;
 1292         }
 1293         PROC_UNLOCK(p);
 1294         return (ret);
 1295 }
 1296 
 1297 /*
 1298  * - nfs pseudo system call for the client
 1299  */
 1300 /*
 1301  * MPSAFE
 1302  */
 1303 static int
 1304 nfssvc_nfscl(struct thread *td, struct nfssvc_args *uap)
 1305 {
 1306         struct file *fp;
 1307         struct nfscbd_args nfscbdarg;
 1308         struct nfsd_nfscbd_args nfscbdarg2;
 1309         struct nameidata nd;
 1310         struct nfscl_dumpmntopts dumpmntopts;
 1311         cap_rights_t rights;
 1312         char *buf;
 1313         int error;
 1314 
 1315         if (uap->flag & NFSSVC_CBADDSOCK) {
 1316                 error = copyin(uap->argp, (caddr_t)&nfscbdarg, sizeof(nfscbdarg));
 1317                 if (error)
 1318                         return (error);
 1319                 /*
 1320                  * Since we don't know what rights might be required,
 1321                  * pretend that we need them all. It is better to be too
 1322                  * careful than too reckless.
 1323                  */
 1324                 error = fget(td, nfscbdarg.sock,
 1325                     cap_rights_init(&rights, CAP_SOCK_CLIENT), &fp);
 1326                 if (error)
 1327                         return (error);
 1328                 if (fp->f_type != DTYPE_SOCKET) {
 1329                         fdrop(fp, td);
 1330                         return (EPERM);
 1331                 }
 1332                 error = nfscbd_addsock(fp);
 1333                 fdrop(fp, td);
 1334                 if (!error && nfscl_enablecallb == 0) {
 1335                         nfsv4_cbport = nfscbdarg.port;
 1336                         nfscl_enablecallb = 1;
 1337                 }
 1338         } else if (uap->flag & NFSSVC_NFSCBD) {
 1339                 if (uap->argp == NULL) 
 1340                         return (EINVAL);
 1341                 error = copyin(uap->argp, (caddr_t)&nfscbdarg2,
 1342                     sizeof(nfscbdarg2));
 1343                 if (error)
 1344                         return (error);
 1345                 error = nfscbd_nfsd(td, &nfscbdarg2);
 1346         } else if (uap->flag & NFSSVC_DUMPMNTOPTS) {
 1347                 error = copyin(uap->argp, &dumpmntopts, sizeof(dumpmntopts));
 1348                 if (error == 0 && (dumpmntopts.ndmnt_blen < 256 ||
 1349                     dumpmntopts.ndmnt_blen > 1024))
 1350                         error = EINVAL;
 1351                 if (error == 0)
 1352                         error = nfsrv_lookupfilename(&nd,
 1353                             dumpmntopts.ndmnt_fname, td);
 1354                 if (error == 0 && strcmp(nd.ni_vp->v_mount->mnt_vfc->vfc_name,
 1355                     "nfs") != 0) {
 1356                         vput(nd.ni_vp);
 1357                         error = EINVAL;
 1358                 }
 1359                 if (error == 0) {
 1360                         buf = malloc(dumpmntopts.ndmnt_blen, M_TEMP, M_WAITOK);
 1361                         nfscl_retopts(VFSTONFS(nd.ni_vp->v_mount), buf,
 1362                             dumpmntopts.ndmnt_blen);
 1363                         vput(nd.ni_vp);
 1364                         error = copyout(buf, dumpmntopts.ndmnt_buf,
 1365                             dumpmntopts.ndmnt_blen);
 1366                         free(buf, M_TEMP);
 1367                 }
 1368         } else {
 1369                 error = EINVAL;
 1370         }
 1371         return (error);
 1372 }
 1373 
 1374 extern int (*nfsd_call_nfscl)(struct thread *, struct nfssvc_args *);
 1375 
 1376 /*
 1377  * Called once to initialize data structures...
 1378  */
 1379 static int
 1380 nfscl_modevent(module_t mod, int type, void *data)
 1381 {
 1382         int error = 0;
 1383         static int loaded = 0;
 1384 
 1385         switch (type) {
 1386         case MOD_LOAD:
 1387                 if (loaded)
 1388                         return (0);
 1389                 newnfs_portinit();
 1390                 mtx_init(&ncl_iod_mutex, "ncl_iod_mutex", NULL, MTX_DEF);
 1391                 nfscl_init();
 1392                 NFSD_LOCK();
 1393                 nfsrvd_cbinit(0);
 1394                 NFSD_UNLOCK();
 1395                 ncl_call_invalcaches = ncl_invalcaches;
 1396                 nfsd_call_nfscl = nfssvc_nfscl;
 1397                 loaded = 1;
 1398                 break;
 1399 
 1400         case MOD_UNLOAD:
 1401                 if (nfs_numnfscbd != 0) {
 1402                         error = EBUSY;
 1403                         break;
 1404                 }
 1405 
 1406                 /*
 1407                  * XXX: Unloading of nfscl module is unsupported.
 1408                  */
 1409 #if 0
 1410                 ncl_call_invalcaches = NULL;
 1411                 nfsd_call_nfscl = NULL;
 1412                 /* and get rid of the mutexes */
 1413                 mtx_destroy(&ncl_iod_mutex);
 1414                 loaded = 0;
 1415                 break;
 1416 #else
 1417                 /* FALLTHROUGH */
 1418 #endif
 1419         default:
 1420                 error = EOPNOTSUPP;
 1421                 break;
 1422         }
 1423         return error;
 1424 }
 1425 static moduledata_t nfscl_mod = {
 1426         "nfscl",
 1427         nfscl_modevent,
 1428         NULL,
 1429 };
 1430 DECLARE_MODULE(nfscl, nfscl_mod, SI_SUB_VFS, SI_ORDER_FIRST);
 1431 
 1432 /* So that loader and kldload(2) can find us, wherever we are.. */
 1433 MODULE_VERSION(nfscl, 1);
 1434 MODULE_DEPEND(nfscl, nfscommon, 1, 1, 1);
 1435 MODULE_DEPEND(nfscl, krpc, 1, 1, 1);
 1436 MODULE_DEPEND(nfscl, nfssvc, 1, 1, 1);
 1437 MODULE_DEPEND(nfscl, nfslock, 1, 1, 1);
 1438 

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