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/11.2/sys/fs/nfsclient/nfs_clport.c 333061 2018-04-27 12:57:39Z 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         lockinit(&np->n_excl, PVFS, "nfsupg", VLKTIMEOUT, LK_NOSHARE |
  234             LK_CANRECURSE);
  235 
  236         /* 
  237          * Are we getting the root? If so, make sure the vnode flags
  238          * are correct 
  239          */
  240         if ((nfhp->nfh_len == nmp->nm_fhsize) &&
  241             !bcmp(nfhp->nfh_fh, nmp->nm_fh, nfhp->nfh_len)) {
  242                 if (vp->v_type == VNON)
  243                         vp->v_type = VDIR;
  244                 vp->v_vflag |= VV_ROOT;
  245         }
  246         
  247         np->n_fhp = nfhp;
  248         /*
  249          * For NFSv4, we have to attach the directory file handle and
  250          * file name, so that Open Ops can be done later.
  251          */
  252         if (nmp->nm_flag & NFSMNT_NFSV4) {
  253                 MALLOC(np->n_v4, struct nfsv4node *, sizeof (struct nfsv4node)
  254                     + dnp->n_fhp->nfh_len + cnp->cn_namelen - 1, M_NFSV4NODE,
  255                     M_WAITOK);
  256                 np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len;
  257                 np->n_v4->n4_namelen = cnp->cn_namelen;
  258                 NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
  259                     dnp->n_fhp->nfh_len);
  260                 NFSBCOPY(cnp->cn_nameptr, NFS4NODENAME(np->n_v4),
  261                     cnp->cn_namelen);
  262         } else {
  263                 np->n_v4 = NULL;
  264         }
  265 
  266         /*
  267          * NFS supports recursive and shared locking.
  268          */
  269         lockmgr(vp->v_vnlock, LK_EXCLUSIVE | LK_NOWITNESS, NULL);
  270         VN_LOCK_AREC(vp);
  271         VN_LOCK_ASHARE(vp);
  272         error = insmntque(vp, mntp);
  273         if (error != 0) {
  274                 *npp = NULL;
  275                 mtx_destroy(&np->n_mtx);
  276                 lockdestroy(&np->n_excl);
  277                 FREE((caddr_t)nfhp, M_NFSFH);
  278                 if (np->n_v4 != NULL)
  279                         FREE((caddr_t)np->n_v4, M_NFSV4NODE);
  280                 uma_zfree(newnfsnode_zone, np);
  281                 return (error);
  282         }
  283         error = vfs_hash_insert(vp, hash, lkflags, 
  284             td, &nvp, newnfs_vncmpf, nfhp);
  285         if (error)
  286                 return (error);
  287         if (nvp != NULL) {
  288                 *npp = VTONFS(nvp);
  289                 /* vfs_hash_insert() vput()'s the losing vnode */
  290                 return (0);
  291         }
  292         *npp = np;
  293 
  294         return (0);
  295 }
  296 
  297 /*
  298  * Another variant of nfs_nget(). This one is only used by reopen. It
  299  * takes almost the same args as nfs_nget(), but only succeeds if an entry
  300  * exists in the cache. (Since files should already be "open" with a
  301  * vnode ref cnt on the node when reopen calls this, it should always
  302  * succeed.)
  303  * Also, don't get a vnode lock, since it may already be locked by some
  304  * other process that is handling it. This is ok, since all other threads
  305  * on the client are blocked by the nfsc_lock being exclusively held by the
  306  * caller of this function.
  307  */
  308 int
  309 nfscl_ngetreopen(struct mount *mntp, u_int8_t *fhp, int fhsize,
  310     struct thread *td, struct nfsnode **npp)
  311 {
  312         struct vnode *nvp;
  313         u_int hash;
  314         struct nfsfh *nfhp;
  315         int error;
  316 
  317         *npp = NULL;
  318         /* For forced dismounts, just return error. */
  319         if (NFSCL_FORCEDISM(mntp))
  320                 return (EINTR);
  321         MALLOC(nfhp, struct nfsfh *, sizeof (struct nfsfh) + fhsize,
  322             M_NFSFH, M_WAITOK);
  323         bcopy(fhp, &nfhp->nfh_fh[0], fhsize);
  324         nfhp->nfh_len = fhsize;
  325 
  326         hash = fnv_32_buf(fhp, fhsize, FNV1_32_INIT);
  327 
  328         /*
  329          * First, try to get the vnode locked, but don't block for the lock.
  330          */
  331         error = vfs_hash_get(mntp, hash, (LK_EXCLUSIVE | LK_NOWAIT), td, &nvp,
  332             newnfs_vncmpf, nfhp);
  333         if (error == 0 && nvp != NULL) {
  334                 NFSVOPUNLOCK(nvp, 0);
  335         } else if (error == EBUSY) {
  336                 /*
  337                  * It is safe so long as a vflush() with
  338                  * FORCECLOSE has not been done. Since the Renew thread is
  339                  * stopped and the MNTK_UNMOUNTF flag is set before doing
  340                  * a vflush() with FORCECLOSE, we should be ok here.
  341                  */
  342                 if (NFSCL_FORCEDISM(mntp))
  343                         error = EINTR;
  344                 else {
  345                         vfs_hash_ref(mntp, hash, td, &nvp, newnfs_vncmpf, nfhp);
  346                         if (nvp == NULL) {
  347                                 error = ENOENT;
  348                         } else if ((nvp->v_iflag & VI_DOOMED) != 0) {
  349                                 error = ENOENT;
  350                                 vrele(nvp);
  351                         } else {
  352                                 error = 0;
  353                         }
  354                 }
  355         }
  356         FREE(nfhp, M_NFSFH);
  357         if (error)
  358                 return (error);
  359         if (nvp != NULL) {
  360                 *npp = VTONFS(nvp);
  361                 return (0);
  362         }
  363         return (EINVAL);
  364 }
  365 
  366 static void
  367 nfscl_warn_fileid(struct nfsmount *nmp, struct nfsvattr *oldnap,
  368     struct nfsvattr *newnap)
  369 {
  370         int off;
  371 
  372         if (ncl_fileid_maxwarnings >= 0 &&
  373             ncl_fileid_nwarnings >= ncl_fileid_maxwarnings)
  374                 return;
  375         off = 0;
  376         if (ncl_fileid_maxwarnings >= 0) {
  377                 if (++ncl_fileid_nwarnings >= ncl_fileid_maxwarnings)
  378                         off = 1;
  379         }
  380 
  381         printf("newnfs: server '%s' error: fileid changed. "
  382             "fsid %jx:%jx: expected fileid %#jx, got %#jx. "
  383             "(BROKEN NFS SERVER OR MIDDLEWARE)\n",
  384             nmp->nm_com.nmcom_hostname,
  385             (uintmax_t)nmp->nm_fsid[0],
  386             (uintmax_t)nmp->nm_fsid[1],
  387             (uintmax_t)oldnap->na_fileid,
  388             (uintmax_t)newnap->na_fileid);
  389 
  390         if (off)
  391                 printf("newnfs: Logged %d times about fileid corruption; "
  392                     "going quiet to avoid spamming logs excessively. (Limit "
  393                     "is: %d).\n", ncl_fileid_nwarnings,
  394                     ncl_fileid_maxwarnings);
  395 }
  396 
  397 /*
  398  * Load the attribute cache (that lives in the nfsnode entry) with
  399  * the attributes of the second argument and
  400  * Iff vaper not NULL
  401  *    copy the attributes to *vaper
  402  * Similar to nfs_loadattrcache(), except the attributes are passed in
  403  * instead of being parsed out of the mbuf list.
  404  */
  405 int
  406 nfscl_loadattrcache(struct vnode **vpp, struct nfsvattr *nap, void *nvaper,
  407     void *stuff, int writeattr, int dontshrink)
  408 {
  409         struct vnode *vp = *vpp;
  410         struct vattr *vap, *nvap = &nap->na_vattr, *vaper = nvaper;
  411         struct nfsnode *np;
  412         struct nfsmount *nmp;
  413         struct timespec mtime_save;
  414         u_quad_t nsize;
  415         int setnsize, error, force_fid_err;
  416 
  417         error = 0;
  418         setnsize = 0;
  419         nsize = 0;
  420 
  421         /*
  422          * If v_type == VNON it is a new node, so fill in the v_type,
  423          * n_mtime fields. Check to see if it represents a special 
  424          * device, and if so, check for a possible alias. Once the
  425          * correct vnode has been obtained, fill in the rest of the
  426          * information.
  427          */
  428         np = VTONFS(vp);
  429         NFSLOCKNODE(np);
  430         if (vp->v_type != nvap->va_type) {
  431                 vp->v_type = nvap->va_type;
  432                 if (vp->v_type == VFIFO)
  433                         vp->v_op = &newnfs_fifoops;
  434                 np->n_mtime = nvap->va_mtime;
  435         }
  436         nmp = VFSTONFS(vp->v_mount);
  437         vap = &np->n_vattr.na_vattr;
  438         mtime_save = vap->va_mtime;
  439         if (writeattr) {
  440                 np->n_vattr.na_filerev = nap->na_filerev;
  441                 np->n_vattr.na_size = nap->na_size;
  442                 np->n_vattr.na_mtime = nap->na_mtime;
  443                 np->n_vattr.na_ctime = nap->na_ctime;
  444                 np->n_vattr.na_fsid = nap->na_fsid;
  445                 np->n_vattr.na_mode = nap->na_mode;
  446         } else {
  447                 force_fid_err = 0;
  448                 KFAIL_POINT_ERROR(DEBUG_FP, nfscl_force_fileid_warning,
  449                     force_fid_err);
  450                 /*
  451                  * BROKEN NFS SERVER OR MIDDLEWARE
  452                  *
  453                  * Certain NFS servers (certain old proprietary filers ca.
  454                  * 2006) or broken middleboxes (e.g. WAN accelerator products)
  455                  * will respond to GETATTR requests with results for a
  456                  * different fileid.
  457                  *
  458                  * The WAN accelerator we've observed not only serves stale
  459                  * cache results for a given file, it also occasionally serves
  460                  * results for wholly different files.  This causes surprising
  461                  * problems; for example the cached size attribute of a file
  462                  * may truncate down and then back up, resulting in zero
  463                  * regions in file contents read by applications.  We observed
  464                  * this reliably with Clang and .c files during parallel build.
  465                  * A pcap revealed packet fragmentation and GETATTR RPC
  466                  * responses with wholly wrong fileids.
  467                  */
  468                 if ((np->n_vattr.na_fileid != 0 &&
  469                      np->n_vattr.na_fileid != nap->na_fileid) ||
  470                     force_fid_err) {
  471                         nfscl_warn_fileid(nmp, &np->n_vattr, nap);
  472                         error = EIDRM;
  473                         goto out;
  474                 }
  475                 NFSBCOPY((caddr_t)nap, (caddr_t)&np->n_vattr,
  476                     sizeof (struct nfsvattr));
  477         }
  478 
  479         /*
  480          * For NFSv4, if the node's fsid is not equal to the mount point's
  481          * fsid, return the low order 32bits of the node's fsid. This
  482          * allows getcwd(3) to work. There is a chance that the fsid might
  483          * be the same as a local fs, but since this is in an NFS mount
  484          * point, I don't think that will cause any problems?
  485          */
  486         if (NFSHASNFSV4(nmp) && NFSHASHASSETFSID(nmp) &&
  487             (nmp->nm_fsid[0] != np->n_vattr.na_filesid[0] ||
  488              nmp->nm_fsid[1] != np->n_vattr.na_filesid[1])) {
  489                 /*
  490                  * va_fsid needs to be set to some value derived from
  491                  * np->n_vattr.na_filesid that is not equal
  492                  * vp->v_mount->mnt_stat.f_fsid[0], so that it changes
  493                  * from the value used for the top level server volume
  494                  * in the mounted subtree.
  495                  */
  496                 if (vp->v_mount->mnt_stat.f_fsid.val[0] !=
  497                     (uint32_t)np->n_vattr.na_filesid[0])
  498                         vap->va_fsid = (uint32_t)np->n_vattr.na_filesid[0];
  499                 else
  500                         vap->va_fsid = (uint32_t)hash32_buf(
  501                             np->n_vattr.na_filesid, 2 * sizeof(uint64_t), 0);
  502         } else
  503                 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
  504         np->n_attrstamp = time_second;
  505         if (vap->va_size != np->n_size) {
  506                 if (vap->va_type == VREG) {
  507                         if (dontshrink && vap->va_size < np->n_size) {
  508                                 /*
  509                                  * We've been told not to shrink the file;
  510                                  * zero np->n_attrstamp to indicate that
  511                                  * the attributes are stale.
  512                                  */
  513                                 vap->va_size = np->n_size;
  514                                 np->n_attrstamp = 0;
  515                                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
  516                                 vnode_pager_setsize(vp, np->n_size);
  517                         } else if (np->n_flag & NMODIFIED) {
  518                                 /*
  519                                  * We've modified the file: Use the larger
  520                                  * of our size, and the server's size.
  521                                  */
  522                                 if (vap->va_size < np->n_size) {
  523                                         vap->va_size = np->n_size;
  524                                 } else {
  525                                         np->n_size = vap->va_size;
  526                                         np->n_flag |= NSIZECHANGED;
  527                                 }
  528                                 vnode_pager_setsize(vp, np->n_size);
  529                         } else if (vap->va_size < np->n_size) {
  530                                 /*
  531                                  * When shrinking the size, the call to
  532                                  * vnode_pager_setsize() cannot be done
  533                                  * with the mutex held, so delay it until
  534                                  * after the mtx_unlock call.
  535                                  */
  536                                 nsize = np->n_size = vap->va_size;
  537                                 np->n_flag |= NSIZECHANGED;
  538                                 setnsize = 1;
  539                         } else {
  540                                 np->n_size = vap->va_size;
  541                                 np->n_flag |= NSIZECHANGED;
  542                                 vnode_pager_setsize(vp, np->n_size);
  543                         }
  544                 } else {
  545                         np->n_size = vap->va_size;
  546                 }
  547         }
  548         /*
  549          * The following checks are added to prevent a race between (say)
  550          * a READDIR+ and a WRITE. 
  551          * READDIR+, WRITE requests sent out.
  552          * READDIR+ resp, WRITE resp received on client.
  553          * However, the WRITE resp was handled before the READDIR+ resp
  554          * causing the post op attrs from the write to be loaded first
  555          * and the attrs from the READDIR+ to be loaded later. If this 
  556          * happens, we have stale attrs loaded into the attrcache.
  557          * We detect this by for the mtime moving back. We invalidate the 
  558          * attrcache when this happens.
  559          */
  560         if (timespeccmp(&mtime_save, &vap->va_mtime, >)) {
  561                 /* Size changed or mtime went backwards */
  562                 np->n_attrstamp = 0;
  563                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
  564         }
  565         if (vaper != NULL) {
  566                 NFSBCOPY((caddr_t)vap, (caddr_t)vaper, sizeof(*vap));
  567                 if (np->n_flag & NCHG) {
  568                         if (np->n_flag & NACC)
  569                                 vaper->va_atime = np->n_atim;
  570                         if (np->n_flag & NUPD)
  571                                 vaper->va_mtime = np->n_mtim;
  572                 }
  573         }
  574 
  575 out:
  576 #ifdef KDTRACE_HOOKS
  577         if (np->n_attrstamp != 0)
  578                 KDTRACE_NFS_ATTRCACHE_LOAD_DONE(vp, vap, error);
  579 #endif
  580         NFSUNLOCKNODE(np);
  581         if (setnsize)
  582                 vnode_pager_setsize(vp, nsize);
  583         return (error);
  584 }
  585 
  586 /*
  587  * Fill in the client id name. For these bytes:
  588  * 1 - they must be unique
  589  * 2 - they should be persistent across client reboots
  590  * 1 is more critical than 2
  591  * Use the mount point's unique id plus either the uuid or, if that
  592  * isn't set, random junk.
  593  */
  594 void
  595 nfscl_fillclid(u_int64_t clval, char *uuid, u_int8_t *cp, u_int16_t idlen)
  596 {
  597         int uuidlen;
  598 
  599         /*
  600          * First, put in the 64bit mount point identifier.
  601          */
  602         if (idlen >= sizeof (u_int64_t)) {
  603                 NFSBCOPY((caddr_t)&clval, cp, sizeof (u_int64_t));
  604                 cp += sizeof (u_int64_t);
  605                 idlen -= sizeof (u_int64_t);
  606         }
  607 
  608         /*
  609          * If uuid is non-zero length, use it.
  610          */
  611         uuidlen = strlen(uuid);
  612         if (uuidlen > 0 && idlen >= uuidlen) {
  613                 NFSBCOPY(uuid, cp, uuidlen);
  614                 cp += uuidlen;
  615                 idlen -= uuidlen;
  616         }
  617 
  618         /*
  619          * This only normally happens if the uuid isn't set.
  620          */
  621         while (idlen > 0) {
  622                 *cp++ = (u_int8_t)(arc4random() % 256);
  623                 idlen--;
  624         }
  625 }
  626 
  627 /*
  628  * Fill in a lock owner name. For now, pid + the process's creation time.
  629  */
  630 void
  631 nfscl_filllockowner(void *id, u_int8_t *cp, int flags)
  632 {
  633         union {
  634                 u_int32_t       lval;
  635                 u_int8_t        cval[4];
  636         } tl;
  637         struct proc *p;
  638 
  639         if (id == NULL) {
  640                 /* Return the single open_owner of all 0 bytes. */
  641                 bzero(cp, NFSV4CL_LOCKNAMELEN);
  642                 return;
  643         }
  644         if ((flags & F_POSIX) != 0) {
  645                 p = (struct proc *)id;
  646                 tl.lval = p->p_pid;
  647                 *cp++ = tl.cval[0];
  648                 *cp++ = tl.cval[1];
  649                 *cp++ = tl.cval[2];
  650                 *cp++ = tl.cval[3];
  651                 tl.lval = p->p_stats->p_start.tv_sec;
  652                 *cp++ = tl.cval[0];
  653                 *cp++ = tl.cval[1];
  654                 *cp++ = tl.cval[2];
  655                 *cp++ = tl.cval[3];
  656                 tl.lval = p->p_stats->p_start.tv_usec;
  657                 *cp++ = tl.cval[0];
  658                 *cp++ = tl.cval[1];
  659                 *cp++ = tl.cval[2];
  660                 *cp = tl.cval[3];
  661         } else if ((flags & F_FLOCK) != 0) {
  662                 bcopy(&id, cp, sizeof(id));
  663                 bzero(&cp[sizeof(id)], NFSV4CL_LOCKNAMELEN - sizeof(id));
  664         } else {
  665                 printf("nfscl_filllockowner: not F_POSIX or F_FLOCK\n");
  666                 bzero(cp, NFSV4CL_LOCKNAMELEN);
  667         }
  668 }
  669 
  670 /*
  671  * Find the parent process for the thread passed in as an argument.
  672  * If none exists, return NULL, otherwise return a thread for the parent.
  673  * (Can be any of the threads, since it is only used for td->td_proc.)
  674  */
  675 NFSPROC_T *
  676 nfscl_getparent(struct thread *td)
  677 {
  678         struct proc *p;
  679         struct thread *ptd;
  680 
  681         if (td == NULL)
  682                 return (NULL);
  683         p = td->td_proc;
  684         if (p->p_pid == 0)
  685                 return (NULL);
  686         p = p->p_pptr;
  687         if (p == NULL)
  688                 return (NULL);
  689         ptd = TAILQ_FIRST(&p->p_threads);
  690         return (ptd);
  691 }
  692 
  693 /*
  694  * Start up the renew kernel thread.
  695  */
  696 static void
  697 start_nfscl(void *arg)
  698 {
  699         struct nfsclclient *clp;
  700         struct thread *td;
  701 
  702         clp = (struct nfsclclient *)arg;
  703         td = TAILQ_FIRST(&clp->nfsc_renewthread->p_threads);
  704         nfscl_renewthread(clp, td);
  705         kproc_exit(0);
  706 }
  707 
  708 void
  709 nfscl_start_renewthread(struct nfsclclient *clp)
  710 {
  711 
  712         kproc_create(start_nfscl, (void *)clp, &clp->nfsc_renewthread, 0, 0,
  713             "nfscl");
  714 }
  715 
  716 /*
  717  * Handle wcc_data.
  718  * For NFSv4, it assumes that nfsv4_wccattr() was used to set up the getattr
  719  * as the first Op after PutFH.
  720  * (For NFSv4, the postop attributes are after the Op, so they can't be
  721  *  parsed here. A separate call to nfscl_postop_attr() is required.)
  722  */
  723 int
  724 nfscl_wcc_data(struct nfsrv_descript *nd, struct vnode *vp,
  725     struct nfsvattr *nap, int *flagp, int *wccflagp, void *stuff)
  726 {
  727         u_int32_t *tl;
  728         struct nfsnode *np = VTONFS(vp);
  729         struct nfsvattr nfsva;
  730         int error = 0;
  731 
  732         if (wccflagp != NULL)
  733                 *wccflagp = 0;
  734         if (nd->nd_flag & ND_NFSV3) {
  735                 *flagp = 0;
  736                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
  737                 if (*tl == newnfs_true) {
  738                         NFSM_DISSECT(tl, u_int32_t *, 6 * NFSX_UNSIGNED);
  739                         if (wccflagp != NULL) {
  740                                 mtx_lock(&np->n_mtx);
  741                                 *wccflagp = (np->n_mtime.tv_sec ==
  742                                     fxdr_unsigned(u_int32_t, *(tl + 2)) &&
  743                                     np->n_mtime.tv_nsec ==
  744                                     fxdr_unsigned(u_int32_t, *(tl + 3)));
  745                                 mtx_unlock(&np->n_mtx);
  746                         }
  747                 }
  748                 error = nfscl_postop_attr(nd, nap, flagp, stuff);
  749                 if (wccflagp != NULL && *flagp == 0)
  750                         *wccflagp = 0;
  751         } else if ((nd->nd_flag & (ND_NOMOREDATA | ND_NFSV4 | ND_V4WCCATTR))
  752             == (ND_NFSV4 | ND_V4WCCATTR)) {
  753                 error = nfsv4_loadattr(nd, NULL, &nfsva, NULL,
  754                     NULL, 0, NULL, NULL, NULL, NULL, NULL, 0,
  755                     NULL, NULL, NULL, NULL, NULL);
  756                 if (error)
  757                         return (error);
  758                 /*
  759                  * Get rid of Op# and status for next op.
  760                  */
  761                 NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
  762                 if (*++tl)
  763                         nd->nd_flag |= ND_NOMOREDATA;
  764                 if (wccflagp != NULL &&
  765                     nfsva.na_vattr.va_mtime.tv_sec != 0) {
  766                         mtx_lock(&np->n_mtx);
  767                         *wccflagp = (np->n_mtime.tv_sec ==
  768                             nfsva.na_vattr.va_mtime.tv_sec &&
  769                             np->n_mtime.tv_nsec ==
  770                             nfsva.na_vattr.va_mtime.tv_sec);
  771                         mtx_unlock(&np->n_mtx);
  772                 }
  773         }
  774 nfsmout:
  775         return (error);
  776 }
  777 
  778 /*
  779  * Get postop attributes.
  780  */
  781 int
  782 nfscl_postop_attr(struct nfsrv_descript *nd, struct nfsvattr *nap, int *retp,
  783     void *stuff)
  784 {
  785         u_int32_t *tl;
  786         int error = 0;
  787 
  788         *retp = 0;
  789         if (nd->nd_flag & ND_NOMOREDATA)
  790                 return (error);
  791         if (nd->nd_flag & ND_NFSV3) {
  792                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
  793                 *retp = fxdr_unsigned(int, *tl);
  794         } else if (nd->nd_flag & ND_NFSV4) {
  795                 /*
  796                  * For NFSv4, the postop attr are at the end, so no point
  797                  * in looking if nd_repstat != 0.
  798                  */
  799                 if (!nd->nd_repstat) {
  800                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
  801                         if (*(tl + 1))
  802                                 /* should never happen since nd_repstat != 0 */
  803                                 nd->nd_flag |= ND_NOMOREDATA;
  804                         else
  805                                 *retp = 1;
  806                 }
  807         } else if (!nd->nd_repstat) {
  808                 /* For NFSv2, the attributes are here iff nd_repstat == 0 */
  809                 *retp = 1;
  810         }
  811         if (*retp) {
  812                 error = nfsm_loadattr(nd, nap);
  813                 if (error)
  814                         *retp = 0;
  815         }
  816 nfsmout:
  817         return (error);
  818 }
  819 
  820 /*
  821  * Fill in the setable attributes. The full argument indicates whether
  822  * to fill in them all or just mode and time.
  823  */
  824 void
  825 nfscl_fillsattr(struct nfsrv_descript *nd, struct vattr *vap,
  826     struct vnode *vp, int flags, u_int32_t rdev)
  827 {
  828         u_int32_t *tl;
  829         struct nfsv2_sattr *sp;
  830         nfsattrbit_t attrbits;
  831 
  832         switch (nd->nd_flag & (ND_NFSV2 | ND_NFSV3 | ND_NFSV4)) {
  833         case ND_NFSV2:
  834                 NFSM_BUILD(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
  835                 if (vap->va_mode == (mode_t)VNOVAL)
  836                         sp->sa_mode = newnfs_xdrneg1;
  837                 else
  838                         sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode);
  839                 if (vap->va_uid == (uid_t)VNOVAL)
  840                         sp->sa_uid = newnfs_xdrneg1;
  841                 else
  842                         sp->sa_uid = txdr_unsigned(vap->va_uid);
  843                 if (vap->va_gid == (gid_t)VNOVAL)
  844                         sp->sa_gid = newnfs_xdrneg1;
  845                 else
  846                         sp->sa_gid = txdr_unsigned(vap->va_gid);
  847                 if (flags & NFSSATTR_SIZE0)
  848                         sp->sa_size = 0;
  849                 else if (flags & NFSSATTR_SIZENEG1)
  850                         sp->sa_size = newnfs_xdrneg1;
  851                 else if (flags & NFSSATTR_SIZERDEV)
  852                         sp->sa_size = txdr_unsigned(rdev);
  853                 else
  854                         sp->sa_size = txdr_unsigned(vap->va_size);
  855                 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
  856                 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
  857                 break;
  858         case ND_NFSV3:
  859                 if (vap->va_mode != (mode_t)VNOVAL) {
  860                         NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
  861                         *tl++ = newnfs_true;
  862                         *tl = txdr_unsigned(vap->va_mode);
  863                 } else {
  864                         NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
  865                         *tl = newnfs_false;
  866                 }
  867                 if ((flags & NFSSATTR_FULL) && vap->va_uid != (uid_t)VNOVAL) {
  868                         NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
  869                         *tl++ = newnfs_true;
  870                         *tl = txdr_unsigned(vap->va_uid);
  871                 } else {
  872                         NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
  873                         *tl = newnfs_false;
  874                 }
  875                 if ((flags & NFSSATTR_FULL) && vap->va_gid != (gid_t)VNOVAL) {
  876                         NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
  877                         *tl++ = newnfs_true;
  878                         *tl = txdr_unsigned(vap->va_gid);
  879                 } else {
  880                         NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
  881                         *tl = newnfs_false;
  882                 }
  883                 if ((flags & NFSSATTR_FULL) && vap->va_size != VNOVAL) {
  884                         NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
  885                         *tl++ = newnfs_true;
  886                         txdr_hyper(vap->va_size, tl);
  887                 } else {
  888                         NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
  889                         *tl = newnfs_false;
  890                 }
  891                 if (vap->va_atime.tv_sec != VNOVAL) {
  892                         if ((vap->va_vaflags & VA_UTIMES_NULL) == 0) {
  893                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
  894                                 *tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT);
  895                                 txdr_nfsv3time(&vap->va_atime, tl);
  896                         } else {
  897                                 NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
  898                                 *tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER);
  899                         }
  900                 } else {
  901                         NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
  902                         *tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE);
  903                 }
  904                 if (vap->va_mtime.tv_sec != VNOVAL) {
  905                         if ((vap->va_vaflags & VA_UTIMES_NULL) == 0) {
  906                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
  907                                 *tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT);
  908                                 txdr_nfsv3time(&vap->va_mtime, tl);
  909                         } else {
  910                                 NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
  911                                 *tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER);
  912                         }
  913                 } else {
  914                         NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
  915                         *tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE);
  916                 }
  917                 break;
  918         case ND_NFSV4:
  919                 NFSZERO_ATTRBIT(&attrbits);
  920                 if (vap->va_mode != (mode_t)VNOVAL)
  921                         NFSSETBIT_ATTRBIT(&attrbits, NFSATTRBIT_MODE);
  922                 if ((flags & NFSSATTR_FULL) && vap->va_uid != (uid_t)VNOVAL)
  923                         NFSSETBIT_ATTRBIT(&attrbits, NFSATTRBIT_OWNER);
  924                 if ((flags & NFSSATTR_FULL) && vap->va_gid != (gid_t)VNOVAL)
  925                         NFSSETBIT_ATTRBIT(&attrbits, NFSATTRBIT_OWNERGROUP);
  926                 if ((flags & NFSSATTR_FULL) && vap->va_size != VNOVAL)
  927                         NFSSETBIT_ATTRBIT(&attrbits, NFSATTRBIT_SIZE);
  928                 if (vap->va_atime.tv_sec != VNOVAL)
  929                         NFSSETBIT_ATTRBIT(&attrbits, NFSATTRBIT_TIMEACCESSSET);
  930                 if (vap->va_mtime.tv_sec != VNOVAL)
  931                         NFSSETBIT_ATTRBIT(&attrbits, NFSATTRBIT_TIMEMODIFYSET);
  932                 (void) nfsv4_fillattr(nd, vp->v_mount, vp, NULL, vap, NULL, 0,
  933                     &attrbits, NULL, NULL, 0, 0, 0, 0, (uint64_t)0);
  934                 break;
  935         }
  936 }
  937 
  938 /*
  939  * nfscl_request() - mostly a wrapper for newnfs_request().
  940  */
  941 int
  942 nfscl_request(struct nfsrv_descript *nd, struct vnode *vp, NFSPROC_T *p,
  943     struct ucred *cred, void *stuff)
  944 {
  945         int ret, vers;
  946         struct nfsmount *nmp;
  947 
  948         nmp = VFSTONFS(vp->v_mount);
  949         if (nd->nd_flag & ND_NFSV4)
  950                 vers = NFS_VER4;
  951         else if (nd->nd_flag & ND_NFSV3)
  952                 vers = NFS_VER3;
  953         else
  954                 vers = NFS_VER2;
  955         ret = newnfs_request(nd, nmp, NULL, &nmp->nm_sockreq, vp, p, cred,
  956                 NFS_PROG, vers, NULL, 1, NULL, NULL);
  957         return (ret);
  958 }
  959 
  960 /*
  961  * fill in this bsden's variant of statfs using nfsstatfs.
  962  */
  963 void
  964 nfscl_loadsbinfo(struct nfsmount *nmp, struct nfsstatfs *sfp, void *statfs)
  965 {
  966         struct statfs *sbp = (struct statfs *)statfs;
  967 
  968         if (nmp->nm_flag & (NFSMNT_NFSV3 | NFSMNT_NFSV4)) {
  969                 sbp->f_bsize = NFS_FABLKSIZE;
  970                 sbp->f_blocks = sfp->sf_tbytes / NFS_FABLKSIZE;
  971                 sbp->f_bfree = sfp->sf_fbytes / NFS_FABLKSIZE;
  972                 /*
  973                  * Although sf_abytes is uint64_t and f_bavail is int64_t,
  974                  * the value after dividing by NFS_FABLKSIZE is small
  975                  * enough that it will fit in 63bits, so it is ok to
  976                  * assign it to f_bavail without fear that it will become
  977                  * negative.
  978                  */
  979                 sbp->f_bavail = sfp->sf_abytes / NFS_FABLKSIZE;
  980                 sbp->f_files = sfp->sf_tfiles;
  981                 /* Since f_ffree is int64_t, clip it to 63bits. */
  982                 if (sfp->sf_ffiles > INT64_MAX)
  983                         sbp->f_ffree = INT64_MAX;
  984                 else
  985                         sbp->f_ffree = sfp->sf_ffiles;
  986         } else if ((nmp->nm_flag & NFSMNT_NFSV4) == 0) {
  987                 /*
  988                  * The type casts to (int32_t) ensure that this code is
  989                  * compatible with the old NFS client, in that it will
  990                  * propagate bit31 to the high order bits. This may or may
  991                  * not be correct for NFSv2, but since it is a legacy
  992                  * environment, I'd rather retain backwards compatibility.
  993                  */
  994                 sbp->f_bsize = (int32_t)sfp->sf_bsize;
  995                 sbp->f_blocks = (int32_t)sfp->sf_blocks;
  996                 sbp->f_bfree = (int32_t)sfp->sf_bfree;
  997                 sbp->f_bavail = (int32_t)sfp->sf_bavail;
  998                 sbp->f_files = 0;
  999                 sbp->f_ffree = 0;
 1000         }
 1001 }
 1002 
 1003 /*
 1004  * Use the fsinfo stuff to update the mount point.
 1005  */
 1006 void
 1007 nfscl_loadfsinfo(struct nfsmount *nmp, struct nfsfsinfo *fsp)
 1008 {
 1009 
 1010         if ((nmp->nm_wsize == 0 || fsp->fs_wtpref < nmp->nm_wsize) &&
 1011             fsp->fs_wtpref >= NFS_FABLKSIZE)
 1012                 nmp->nm_wsize = (fsp->fs_wtpref + NFS_FABLKSIZE - 1) &
 1013                     ~(NFS_FABLKSIZE - 1);
 1014         if (fsp->fs_wtmax < nmp->nm_wsize && fsp->fs_wtmax > 0) {
 1015                 nmp->nm_wsize = fsp->fs_wtmax & ~(NFS_FABLKSIZE - 1);
 1016                 if (nmp->nm_wsize == 0)
 1017                         nmp->nm_wsize = fsp->fs_wtmax;
 1018         }
 1019         if (nmp->nm_wsize < NFS_FABLKSIZE)
 1020                 nmp->nm_wsize = NFS_FABLKSIZE;
 1021         if ((nmp->nm_rsize == 0 || fsp->fs_rtpref < nmp->nm_rsize) &&
 1022             fsp->fs_rtpref >= NFS_FABLKSIZE)
 1023                 nmp->nm_rsize = (fsp->fs_rtpref + NFS_FABLKSIZE - 1) &
 1024                     ~(NFS_FABLKSIZE - 1);
 1025         if (fsp->fs_rtmax < nmp->nm_rsize && fsp->fs_rtmax > 0) {
 1026                 nmp->nm_rsize = fsp->fs_rtmax & ~(NFS_FABLKSIZE - 1);
 1027                 if (nmp->nm_rsize == 0)
 1028                         nmp->nm_rsize = fsp->fs_rtmax;
 1029         }
 1030         if (nmp->nm_rsize < NFS_FABLKSIZE)
 1031                 nmp->nm_rsize = NFS_FABLKSIZE;
 1032         if ((nmp->nm_readdirsize == 0 || fsp->fs_dtpref < nmp->nm_readdirsize)
 1033             && fsp->fs_dtpref >= NFS_DIRBLKSIZ)
 1034                 nmp->nm_readdirsize = (fsp->fs_dtpref + NFS_DIRBLKSIZ - 1) &
 1035                     ~(NFS_DIRBLKSIZ - 1);
 1036         if (fsp->fs_rtmax < nmp->nm_readdirsize && fsp->fs_rtmax > 0) {
 1037                 nmp->nm_readdirsize = fsp->fs_rtmax & ~(NFS_DIRBLKSIZ - 1);
 1038                 if (nmp->nm_readdirsize == 0)
 1039                         nmp->nm_readdirsize = fsp->fs_rtmax;
 1040         }
 1041         if (nmp->nm_readdirsize < NFS_DIRBLKSIZ)
 1042                 nmp->nm_readdirsize = NFS_DIRBLKSIZ;
 1043         if (fsp->fs_maxfilesize > 0 &&
 1044             fsp->fs_maxfilesize < nmp->nm_maxfilesize)
 1045                 nmp->nm_maxfilesize = fsp->fs_maxfilesize;
 1046         nmp->nm_mountp->mnt_stat.f_iosize = newnfs_iosize(nmp);
 1047         nmp->nm_state |= NFSSTA_GOTFSINFO;
 1048 }
 1049 
 1050 /*
 1051  * Lookups source address which should be used to communicate with
 1052  * @nmp and stores it inside @pdst.
 1053  *
 1054  * Returns 0 on success.
 1055  */
 1056 u_int8_t *
 1057 nfscl_getmyip(struct nfsmount *nmp, struct in6_addr *paddr, int *isinet6p)
 1058 {
 1059 #if defined(INET6) || defined(INET)
 1060         int error, fibnum;
 1061 
 1062         fibnum = curthread->td_proc->p_fibnum;
 1063 #endif
 1064 #ifdef INET
 1065         if (nmp->nm_nam->sa_family == AF_INET) {
 1066                 struct sockaddr_in *sin;
 1067                 struct nhop4_extended nh_ext;
 1068 
 1069                 sin = (struct sockaddr_in *)nmp->nm_nam;
 1070                 CURVNET_SET(CRED_TO_VNET(nmp->nm_sockreq.nr_cred));
 1071                 error = fib4_lookup_nh_ext(fibnum, sin->sin_addr, 0, 0,
 1072                     &nh_ext);
 1073                 CURVNET_RESTORE();
 1074                 if (error != 0)
 1075                         return (NULL);
 1076 
 1077                 if ((ntohl(nh_ext.nh_src.s_addr) >> IN_CLASSA_NSHIFT) ==
 1078                     IN_LOOPBACKNET) {
 1079                         /* Ignore loopback addresses */
 1080                         return (NULL);
 1081                 }
 1082 
 1083                 *isinet6p = 0;
 1084                 *((struct in_addr *)paddr) = nh_ext.nh_src;
 1085 
 1086                 return (u_int8_t *)paddr;
 1087         }
 1088 #endif
 1089 #ifdef INET6
 1090         if (nmp->nm_nam->sa_family == AF_INET6) {
 1091                 struct sockaddr_in6 *sin6;
 1092 
 1093                 sin6 = (struct sockaddr_in6 *)nmp->nm_nam;
 1094 
 1095                 CURVNET_SET(CRED_TO_VNET(nmp->nm_sockreq.nr_cred));
 1096                 error = in6_selectsrc_addr(fibnum, &sin6->sin6_addr,
 1097                     sin6->sin6_scope_id, NULL, paddr, NULL);
 1098                 CURVNET_RESTORE();
 1099                 if (error != 0)
 1100                         return (NULL);
 1101 
 1102                 if (IN6_IS_ADDR_LOOPBACK(paddr))
 1103                         return (NULL);
 1104 
 1105                 /* Scope is embedded in */
 1106                 *isinet6p = 1;
 1107 
 1108                 return (u_int8_t *)paddr;
 1109         }
 1110 #endif
 1111         return (NULL);
 1112 }
 1113 
 1114 /*
 1115  * Copy NFS uid, gids from the cred structure.
 1116  */
 1117 void
 1118 newnfs_copyincred(struct ucred *cr, struct nfscred *nfscr)
 1119 {
 1120         int i;
 1121 
 1122         KASSERT(cr->cr_ngroups >= 0,
 1123             ("newnfs_copyincred: negative cr_ngroups"));
 1124         nfscr->nfsc_uid = cr->cr_uid;
 1125         nfscr->nfsc_ngroups = MIN(cr->cr_ngroups, NFS_MAXGRPS + 1);
 1126         for (i = 0; i < nfscr->nfsc_ngroups; i++)
 1127                 nfscr->nfsc_groups[i] = cr->cr_groups[i];
 1128 }
 1129 
 1130 
 1131 /*
 1132  * Do any client specific initialization.
 1133  */
 1134 void
 1135 nfscl_init(void)
 1136 {
 1137         static int inited = 0;
 1138 
 1139         if (inited)
 1140                 return;
 1141         inited = 1;
 1142         nfscl_inited = 1;
 1143         ncl_pbuf_freecnt = nswbuf / 2 + 1;
 1144 }
 1145 
 1146 /*
 1147  * Check each of the attributes to be set, to ensure they aren't already
 1148  * the correct value. Disable setting ones already correct.
 1149  */
 1150 int
 1151 nfscl_checksattr(struct vattr *vap, struct nfsvattr *nvap)
 1152 {
 1153 
 1154         if (vap->va_mode != (mode_t)VNOVAL) {
 1155                 if (vap->va_mode == nvap->na_mode)
 1156                         vap->va_mode = (mode_t)VNOVAL;
 1157         }
 1158         if (vap->va_uid != (uid_t)VNOVAL) {
 1159                 if (vap->va_uid == nvap->na_uid)
 1160                         vap->va_uid = (uid_t)VNOVAL;
 1161         }
 1162         if (vap->va_gid != (gid_t)VNOVAL) {
 1163                 if (vap->va_gid == nvap->na_gid)
 1164                         vap->va_gid = (gid_t)VNOVAL;
 1165         }
 1166         if (vap->va_size != VNOVAL) {
 1167                 if (vap->va_size == nvap->na_size)
 1168                         vap->va_size = VNOVAL;
 1169         }
 1170 
 1171         /*
 1172          * We are normally called with only a partially initialized
 1173          * VAP.  Since the NFSv3 spec says that server may use the
 1174          * file attributes to store the verifier, the spec requires
 1175          * us to do a SETATTR RPC. FreeBSD servers store the verifier
 1176          * in atime, but we can't really assume that all servers will
 1177          * so we ensure that our SETATTR sets both atime and mtime.
 1178          * Set the VA_UTIMES_NULL flag for this case, so that
 1179          * the server's time will be used.  This is needed to
 1180          * work around a bug in some Solaris servers, where
 1181          * setting the time TOCLIENT causes the Setattr RPC
 1182          * to return NFS_OK, but not set va_mode.
 1183          */
 1184         if (vap->va_mtime.tv_sec == VNOVAL) {
 1185                 vfs_timestamp(&vap->va_mtime);
 1186                 vap->va_vaflags |= VA_UTIMES_NULL;
 1187         }
 1188         if (vap->va_atime.tv_sec == VNOVAL)
 1189                 vap->va_atime = vap->va_mtime;
 1190         return (1);
 1191 }
 1192 
 1193 /*
 1194  * Map nfsv4 errors to errno.h errors.
 1195  * The uid and gid arguments are only used for NFSERR_BADOWNER and that
 1196  * error should only be returned for the Open, Create and Setattr Ops.
 1197  * As such, most calls can just pass in 0 for those arguments.
 1198  */
 1199 APPLESTATIC int
 1200 nfscl_maperr(struct thread *td, int error, uid_t uid, gid_t gid)
 1201 {
 1202         struct proc *p;
 1203 
 1204         if (error < 10000 || error >= NFSERR_STALEWRITEVERF)
 1205                 return (error);
 1206         if (td != NULL)
 1207                 p = td->td_proc;
 1208         else
 1209                 p = NULL;
 1210         switch (error) {
 1211         case NFSERR_BADOWNER:
 1212                 tprintf(p, LOG_INFO,
 1213                     "No name and/or group mapping for uid,gid:(%d,%d)\n",
 1214                     uid, gid);
 1215                 return (EPERM);
 1216         case NFSERR_BADNAME:
 1217         case NFSERR_BADCHAR:
 1218                 printf("nfsv4 char/name not handled by server\n");
 1219                 return (ENOENT);
 1220         case NFSERR_STALECLIENTID:
 1221         case NFSERR_STALESTATEID:
 1222         case NFSERR_EXPIRED:
 1223         case NFSERR_BADSTATEID:
 1224         case NFSERR_BADSESSION:
 1225                 printf("nfsv4 recover err returned %d\n", error);
 1226                 return (EIO);
 1227         case NFSERR_BADHANDLE:
 1228         case NFSERR_SERVERFAULT:
 1229         case NFSERR_BADTYPE:
 1230         case NFSERR_FHEXPIRED:
 1231         case NFSERR_RESOURCE:
 1232         case NFSERR_MOVED:
 1233         case NFSERR_NOFILEHANDLE:
 1234         case NFSERR_MINORVERMISMATCH:
 1235         case NFSERR_OLDSTATEID:
 1236         case NFSERR_BADSEQID:
 1237         case NFSERR_LEASEMOVED:
 1238         case NFSERR_RECLAIMBAD:
 1239         case NFSERR_BADXDR:
 1240         case NFSERR_OPILLEGAL:
 1241                 printf("nfsv4 client/server protocol prob err=%d\n",
 1242                     error);
 1243                 return (EIO);
 1244         default:
 1245                 tprintf(p, LOG_INFO, "nfsv4 err=%d\n", error);
 1246                 return (EIO);
 1247         };
 1248 }
 1249 
 1250 /*
 1251  * Check to see if the process for this owner exists. Return 1 if it doesn't
 1252  * and 0 otherwise.
 1253  */
 1254 int
 1255 nfscl_procdoesntexist(u_int8_t *own)
 1256 {
 1257         union {
 1258                 u_int32_t       lval;
 1259                 u_int8_t        cval[4];
 1260         } tl;
 1261         struct proc *p;
 1262         pid_t pid;
 1263         int i, ret = 0;
 1264 
 1265         /* For the single open_owner of all 0 bytes, just return 0. */
 1266         for (i = 0; i < NFSV4CL_LOCKNAMELEN; i++)
 1267                 if (own[i] != 0)
 1268                         break;
 1269         if (i == NFSV4CL_LOCKNAMELEN)
 1270                 return (0);
 1271 
 1272         tl.cval[0] = *own++;
 1273         tl.cval[1] = *own++;
 1274         tl.cval[2] = *own++;
 1275         tl.cval[3] = *own++;
 1276         pid = tl.lval;
 1277         p = pfind_locked(pid);
 1278         if (p == NULL)
 1279                 return (1);
 1280         if (p->p_stats == NULL) {
 1281                 PROC_UNLOCK(p);
 1282                 return (0);
 1283         }
 1284         tl.cval[0] = *own++;
 1285         tl.cval[1] = *own++;
 1286         tl.cval[2] = *own++;
 1287         tl.cval[3] = *own++;
 1288         if (tl.lval != p->p_stats->p_start.tv_sec) {
 1289                 ret = 1;
 1290         } else {
 1291                 tl.cval[0] = *own++;
 1292                 tl.cval[1] = *own++;
 1293                 tl.cval[2] = *own++;
 1294                 tl.cval[3] = *own;
 1295                 if (tl.lval != p->p_stats->p_start.tv_usec)
 1296                         ret = 1;
 1297         }
 1298         PROC_UNLOCK(p);
 1299         return (ret);
 1300 }
 1301 
 1302 /*
 1303  * - nfs pseudo system call for the client
 1304  */
 1305 /*
 1306  * MPSAFE
 1307  */
 1308 static int
 1309 nfssvc_nfscl(struct thread *td, struct nfssvc_args *uap)
 1310 {
 1311         struct file *fp;
 1312         struct nfscbd_args nfscbdarg;
 1313         struct nfsd_nfscbd_args nfscbdarg2;
 1314         struct nameidata nd;
 1315         struct nfscl_dumpmntopts dumpmntopts;
 1316         cap_rights_t rights;
 1317         char *buf;
 1318         int error;
 1319         struct mount *mp;
 1320         struct nfsmount *nmp;
 1321 
 1322         if (uap->flag & NFSSVC_CBADDSOCK) {
 1323                 error = copyin(uap->argp, (caddr_t)&nfscbdarg, sizeof(nfscbdarg));
 1324                 if (error)
 1325                         return (error);
 1326                 /*
 1327                  * Since we don't know what rights might be required,
 1328                  * pretend that we need them all. It is better to be too
 1329                  * careful than too reckless.
 1330                  */
 1331                 error = fget(td, nfscbdarg.sock,
 1332                     cap_rights_init(&rights, CAP_SOCK_CLIENT), &fp);
 1333                 if (error)
 1334                         return (error);
 1335                 if (fp->f_type != DTYPE_SOCKET) {
 1336                         fdrop(fp, td);
 1337                         return (EPERM);
 1338                 }
 1339                 error = nfscbd_addsock(fp);
 1340                 fdrop(fp, td);
 1341                 if (!error && nfscl_enablecallb == 0) {
 1342                         nfsv4_cbport = nfscbdarg.port;
 1343                         nfscl_enablecallb = 1;
 1344                 }
 1345         } else if (uap->flag & NFSSVC_NFSCBD) {
 1346                 if (uap->argp == NULL) 
 1347                         return (EINVAL);
 1348                 error = copyin(uap->argp, (caddr_t)&nfscbdarg2,
 1349                     sizeof(nfscbdarg2));
 1350                 if (error)
 1351                         return (error);
 1352                 error = nfscbd_nfsd(td, &nfscbdarg2);
 1353         } else if (uap->flag & NFSSVC_DUMPMNTOPTS) {
 1354                 error = copyin(uap->argp, &dumpmntopts, sizeof(dumpmntopts));
 1355                 if (error == 0 && (dumpmntopts.ndmnt_blen < 256 ||
 1356                     dumpmntopts.ndmnt_blen > 1024))
 1357                         error = EINVAL;
 1358                 if (error == 0)
 1359                         error = nfsrv_lookupfilename(&nd,
 1360                             dumpmntopts.ndmnt_fname, td);
 1361                 if (error == 0 && strcmp(nd.ni_vp->v_mount->mnt_vfc->vfc_name,
 1362                     "nfs") != 0) {
 1363                         vput(nd.ni_vp);
 1364                         error = EINVAL;
 1365                 }
 1366                 if (error == 0) {
 1367                         buf = malloc(dumpmntopts.ndmnt_blen, M_TEMP, M_WAITOK);
 1368                         nfscl_retopts(VFSTONFS(nd.ni_vp->v_mount), buf,
 1369                             dumpmntopts.ndmnt_blen);
 1370                         vput(nd.ni_vp);
 1371                         error = copyout(buf, dumpmntopts.ndmnt_buf,
 1372                             dumpmntopts.ndmnt_blen);
 1373                         free(buf, M_TEMP);
 1374                 }
 1375         } else if (uap->flag & NFSSVC_FORCEDISM) {
 1376                 buf = malloc(MNAMELEN + 1, M_TEMP, M_WAITOK);
 1377                 error = copyinstr(uap->argp, buf, MNAMELEN + 1, NULL);
 1378                 if (error == 0) {
 1379                         nmp = NULL;
 1380                         mtx_lock(&mountlist_mtx);
 1381                         TAILQ_FOREACH(mp, &mountlist, mnt_list) {
 1382                                 if (strcmp(mp->mnt_stat.f_mntonname, buf) ==
 1383                                     0 && strcmp(mp->mnt_stat.f_fstypename,
 1384                                     "nfs") == 0 && mp->mnt_data != NULL) {
 1385                                         nmp = VFSTONFS(mp);
 1386                                         mtx_lock(&nmp->nm_mtx);
 1387                                         if ((nmp->nm_privflag &
 1388                                             NFSMNTP_FORCEDISM) == 0) {
 1389                                                 nmp->nm_privflag |= 
 1390                                                    (NFSMNTP_FORCEDISM |
 1391                                                     NFSMNTP_CANCELRPCS);
 1392                                                 mtx_unlock(&nmp->nm_mtx);
 1393                                         } else {
 1394                                                 mtx_unlock(&nmp->nm_mtx);
 1395                                                 nmp = NULL;
 1396                                         }
 1397                                         break;
 1398                                 }
 1399                         }
 1400                         mtx_unlock(&mountlist_mtx);
 1401 
 1402                         if (nmp != NULL) {
 1403                                 /*
 1404                                  * Call newnfs_nmcancelreqs() to cause
 1405                                  * any RPCs in progress on the mount point to
 1406                                  * fail.
 1407                                  * This will cause any process waiting for an
 1408                                  * RPC to complete while holding a vnode lock
 1409                                  * on the mounted-on vnode (such as "df" or
 1410                                  * a non-forced "umount") to fail.
 1411                                  * This will unlock the mounted-on vnode so
 1412                                  * a forced dismount can succeed.
 1413                                  * Then clear NFSMNTP_CANCELRPCS and wakeup(),
 1414                                  * so that nfs_unmount() can complete.
 1415                                  */
 1416                                 newnfs_nmcancelreqs(nmp);
 1417                                 mtx_lock(&nmp->nm_mtx);
 1418                                 nmp->nm_privflag &= ~NFSMNTP_CANCELRPCS;
 1419                                 wakeup(nmp);
 1420                                 mtx_unlock(&nmp->nm_mtx);
 1421                         } else
 1422                                 error = EINVAL;
 1423                 }
 1424                 free(buf, M_TEMP);
 1425         } else {
 1426                 error = EINVAL;
 1427         }
 1428         return (error);
 1429 }
 1430 
 1431 extern int (*nfsd_call_nfscl)(struct thread *, struct nfssvc_args *);
 1432 
 1433 /*
 1434  * Called once to initialize data structures...
 1435  */
 1436 static int
 1437 nfscl_modevent(module_t mod, int type, void *data)
 1438 {
 1439         int error = 0;
 1440         static int loaded = 0;
 1441 
 1442         switch (type) {
 1443         case MOD_LOAD:
 1444                 if (loaded)
 1445                         return (0);
 1446                 newnfs_portinit();
 1447                 mtx_init(&ncl_iod_mutex, "ncl_iod_mutex", NULL, MTX_DEF);
 1448                 nfscl_init();
 1449                 NFSD_LOCK();
 1450                 nfsrvd_cbinit(0);
 1451                 NFSD_UNLOCK();
 1452                 ncl_call_invalcaches = ncl_invalcaches;
 1453                 nfsd_call_nfscl = nfssvc_nfscl;
 1454                 loaded = 1;
 1455                 break;
 1456 
 1457         case MOD_UNLOAD:
 1458                 if (nfs_numnfscbd != 0) {
 1459                         error = EBUSY;
 1460                         break;
 1461                 }
 1462 
 1463                 /*
 1464                  * XXX: Unloading of nfscl module is unsupported.
 1465                  */
 1466 #if 0
 1467                 ncl_call_invalcaches = NULL;
 1468                 nfsd_call_nfscl = NULL;
 1469                 /* and get rid of the mutexes */
 1470                 mtx_destroy(&ncl_iod_mutex);
 1471                 loaded = 0;
 1472                 break;
 1473 #else
 1474                 /* FALLTHROUGH */
 1475 #endif
 1476         default:
 1477                 error = EOPNOTSUPP;
 1478                 break;
 1479         }
 1480         return error;
 1481 }
 1482 static moduledata_t nfscl_mod = {
 1483         "nfscl",
 1484         nfscl_modevent,
 1485         NULL,
 1486 };
 1487 DECLARE_MODULE(nfscl, nfscl_mod, SI_SUB_VFS, SI_ORDER_FIRST);
 1488 
 1489 /* So that loader and kldload(2) can find us, wherever we are.. */
 1490 MODULE_VERSION(nfscl, 1);
 1491 MODULE_DEPEND(nfscl, nfscommon, 1, 1, 1);
 1492 MODULE_DEPEND(nfscl, krpc, 1, 1, 1);
 1493 MODULE_DEPEND(nfscl, nfssvc, 1, 1, 1);
 1494 MODULE_DEPEND(nfscl, nfslock, 1, 1, 1);
 1495 

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