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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1989, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * This code is derived from software contributed to Berkeley by
    8  * Rick Macklem at The University of Guelph.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  */
   35 
   36 #include <sys/cdefs.h>
   37 __FBSDID("$FreeBSD: head/sys/fs/nfsclient/nfs_clport.c 346217 2019-04-15 01:27:15Z rmacklem $");
   38 
   39 #include "opt_inet.h"
   40 #include "opt_inet6.h"
   41 
   42 #include <sys/capsicum.h>
   43 
   44 /*
   45  * generally, I don't like #includes inside .h files, but it seems to
   46  * be the easiest way to handle the port.
   47  */
   48 #include <sys/fail.h>
   49 #include <sys/hash.h>
   50 #include <sys/sysctl.h>
   51 #include <fs/nfs/nfsport.h>
   52 #include <netinet/in_fib.h>
   53 #include <netinet/if_ether.h>
   54 #include <netinet6/ip6_var.h>
   55 #include <net/if_types.h>
   56 
   57 #include <fs/nfsclient/nfs_kdtrace.h>
   58 
   59 #ifdef KDTRACE_HOOKS
   60 dtrace_nfsclient_attrcache_flush_probe_func_t
   61                 dtrace_nfscl_attrcache_flush_done_probe;
   62 uint32_t        nfscl_attrcache_flush_done_id;
   63 
   64 dtrace_nfsclient_attrcache_get_hit_probe_func_t
   65                 dtrace_nfscl_attrcache_get_hit_probe;
   66 uint32_t        nfscl_attrcache_get_hit_id;
   67 
   68 dtrace_nfsclient_attrcache_get_miss_probe_func_t
   69                 dtrace_nfscl_attrcache_get_miss_probe;
   70 uint32_t        nfscl_attrcache_get_miss_id;
   71 
   72 dtrace_nfsclient_attrcache_load_probe_func_t
   73                 dtrace_nfscl_attrcache_load_done_probe;
   74 uint32_t        nfscl_attrcache_load_done_id;
   75 #endif /* !KDTRACE_HOOKS */
   76 
   77 extern u_int32_t newnfs_true, newnfs_false, newnfs_xdrneg1;
   78 extern struct vop_vector newnfs_vnodeops;
   79 extern struct vop_vector newnfs_fifoops;
   80 extern uma_zone_t newnfsnode_zone;
   81 extern struct buf_ops buf_ops_newnfs;
   82 extern uma_zone_t ncl_pbuf_zone;
   83 extern short nfsv4_cbport;
   84 extern int nfscl_enablecallb;
   85 extern int nfs_numnfscbd;
   86 extern int nfscl_inited;
   87 struct mtx ncl_iod_mutex;
   88 NFSDLOCKMUTEX;
   89 extern struct mtx nfsrv_dslock_mtx;
   90 
   91 extern void (*ncl_call_invalcaches)(struct vnode *);
   92 
   93 SYSCTL_DECL(_vfs_nfs);
   94 static int ncl_fileid_maxwarnings = 10;
   95 SYSCTL_INT(_vfs_nfs, OID_AUTO, fileid_maxwarnings, CTLFLAG_RWTUN,
   96     &ncl_fileid_maxwarnings, 0,
   97     "Limit fileid corruption warnings; 0 is off; -1 is unlimited");
   98 static volatile int ncl_fileid_nwarnings;
   99 
  100 static void nfscl_warn_fileid(struct nfsmount *, struct nfsvattr *,
  101     struct nfsvattr *);
  102 
  103 /*
  104  * Comparison function for vfs_hash functions.
  105  */
  106 int
  107 newnfs_vncmpf(struct vnode *vp, void *arg)
  108 {
  109         struct nfsfh *nfhp = (struct nfsfh *)arg;
  110         struct nfsnode *np = VTONFS(vp);
  111 
  112         if (np->n_fhp->nfh_len != nfhp->nfh_len ||
  113             NFSBCMP(np->n_fhp->nfh_fh, nfhp->nfh_fh, nfhp->nfh_len))
  114                 return (1);
  115         return (0);
  116 }
  117 
  118 /*
  119  * Look up a vnode/nfsnode by file handle.
  120  * Callers must check for mount points!!
  121  * In all cases, a pointer to a
  122  * nfsnode structure is returned.
  123  * This variant takes a "struct nfsfh *" as second argument and uses
  124  * that structure up, either by hanging off the nfsnode or FREEing it.
  125  */
  126 int
  127 nfscl_nget(struct mount *mntp, struct vnode *dvp, struct nfsfh *nfhp,
  128     struct componentname *cnp, struct thread *td, struct nfsnode **npp,
  129     void *stuff, int lkflags)
  130 {
  131         struct nfsnode *np, *dnp;
  132         struct vnode *vp, *nvp;
  133         struct nfsv4node *newd, *oldd;
  134         int error;
  135         u_int hash;
  136         struct nfsmount *nmp;
  137 
  138         nmp = VFSTONFS(mntp);
  139         dnp = VTONFS(dvp);
  140         *npp = NULL;
  141 
  142         hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len, FNV1_32_INIT);
  143 
  144         error = vfs_hash_get(mntp, hash, lkflags,
  145             td, &nvp, newnfs_vncmpf, nfhp);
  146         if (error == 0 && nvp != NULL) {
  147                 /*
  148                  * I believe there is a slight chance that vgonel() could
  149                  * get called on this vnode between when NFSVOPLOCK() drops
  150                  * the VI_LOCK() and vget() acquires it again, so that it
  151                  * hasn't yet had v_usecount incremented. If this were to
  152                  * happen, the VI_DOOMED flag would be set, so check for
  153                  * that here. Since we now have the v_usecount incremented,
  154                  * we should be ok until we vrele() it, if the VI_DOOMED
  155                  * flag isn't set now.
  156                  */
  157                 VI_LOCK(nvp);
  158                 if ((nvp->v_iflag & VI_DOOMED)) {
  159                         VI_UNLOCK(nvp);
  160                         vrele(nvp);
  161                         error = ENOENT;
  162                 } else {
  163                         VI_UNLOCK(nvp);
  164                 }
  165         }
  166         if (error) {
  167                 free(nfhp, M_NFSFH);
  168                 return (error);
  169         }
  170         if (nvp != NULL) {
  171                 np = VTONFS(nvp);
  172                 /*
  173                  * For NFSv4, check to see if it is the same name and
  174                  * replace the name, if it is different.
  175                  */
  176                 oldd = newd = NULL;
  177                 if ((nmp->nm_flag & NFSMNT_NFSV4) && np->n_v4 != NULL &&
  178                     nvp->v_type == VREG &&
  179                     (np->n_v4->n4_namelen != cnp->cn_namelen ||
  180                      NFSBCMP(cnp->cn_nameptr, NFS4NODENAME(np->n_v4),
  181                      cnp->cn_namelen) ||
  182                      dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen ||
  183                      NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
  184                      dnp->n_fhp->nfh_len))) {
  185                     newd = malloc(
  186                         sizeof (struct nfsv4node) + dnp->n_fhp->nfh_len +
  187                         + cnp->cn_namelen - 1, M_NFSV4NODE, M_WAITOK);
  188                     NFSLOCKNODE(np);
  189                     if (newd != NULL && np->n_v4 != NULL && nvp->v_type == VREG
  190                         && (np->n_v4->n4_namelen != cnp->cn_namelen ||
  191                          NFSBCMP(cnp->cn_nameptr, NFS4NODENAME(np->n_v4),
  192                          cnp->cn_namelen) ||
  193                          dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen ||
  194                          NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
  195                          dnp->n_fhp->nfh_len))) {
  196                         oldd = np->n_v4;
  197                         np->n_v4 = newd;
  198                         newd = NULL;
  199                         np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len;
  200                         np->n_v4->n4_namelen = cnp->cn_namelen;
  201                         NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
  202                             dnp->n_fhp->nfh_len);
  203                         NFSBCOPY(cnp->cn_nameptr, NFS4NODENAME(np->n_v4),
  204                             cnp->cn_namelen);
  205                     }
  206                     NFSUNLOCKNODE(np);
  207                 }
  208                 if (newd != NULL)
  209                         free(newd, M_NFSV4NODE);
  210                 if (oldd != NULL)
  211                         free(oldd, M_NFSV4NODE);
  212                 *npp = np;
  213                 free(nfhp, M_NFSFH);
  214                 return (0);
  215         }
  216         np = uma_zalloc(newnfsnode_zone, M_WAITOK | M_ZERO);
  217 
  218         error = getnewvnode(nfs_vnode_tag, mntp, &newnfs_vnodeops, &nvp);
  219         if (error) {
  220                 uma_zfree(newnfsnode_zone, np);
  221                 free(nfhp, M_NFSFH);
  222                 return (error);
  223         }
  224         vp = nvp;
  225         KASSERT(vp->v_bufobj.bo_bsize != 0, ("nfscl_nget: bo_bsize == 0"));
  226         vp->v_bufobj.bo_ops = &buf_ops_newnfs;
  227         vp->v_data = np;
  228         np->n_vnode = vp;
  229         /* 
  230          * Initialize the mutex even if the vnode is going to be a loser.
  231          * This simplifies the logic in reclaim, which can then unconditionally
  232          * destroy the mutex (in the case of the loser, or if hash_insert
  233          * happened to return an error no special casing is needed).
  234          */
  235         mtx_init(&np->n_mtx, "NEWNFSnode lock", NULL, MTX_DEF | MTX_DUPOK);
  236         lockinit(&np->n_excl, PVFS, "nfsupg", VLKTIMEOUT, LK_NOSHARE |
  237             LK_CANRECURSE);
  238 
  239         /* 
  240          * Are we getting the root? If so, make sure the vnode flags
  241          * are correct 
  242          */
  243         if ((nfhp->nfh_len == nmp->nm_fhsize) &&
  244             !bcmp(nfhp->nfh_fh, nmp->nm_fh, nfhp->nfh_len)) {
  245                 if (vp->v_type == VNON)
  246                         vp->v_type = VDIR;
  247                 vp->v_vflag |= VV_ROOT;
  248         }
  249         
  250         np->n_fhp = nfhp;
  251         /*
  252          * For NFSv4, we have to attach the directory file handle and
  253          * file name, so that Open Ops can be done later.
  254          */
  255         if (nmp->nm_flag & NFSMNT_NFSV4) {
  256                 np->n_v4 = malloc(sizeof (struct nfsv4node)
  257                     + dnp->n_fhp->nfh_len + cnp->cn_namelen - 1, M_NFSV4NODE,
  258                     M_WAITOK);
  259                 np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len;
  260                 np->n_v4->n4_namelen = cnp->cn_namelen;
  261                 NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
  262                     dnp->n_fhp->nfh_len);
  263                 NFSBCOPY(cnp->cn_nameptr, NFS4NODENAME(np->n_v4),
  264                     cnp->cn_namelen);
  265         } else {
  266                 np->n_v4 = NULL;
  267         }
  268 
  269         /*
  270          * NFS supports recursive and shared locking.
  271          */
  272         lockmgr(vp->v_vnlock, LK_EXCLUSIVE | LK_NOWITNESS, NULL);
  273         VN_LOCK_AREC(vp);
  274         VN_LOCK_ASHARE(vp);
  275         error = insmntque(vp, mntp);
  276         if (error != 0) {
  277                 *npp = NULL;
  278                 mtx_destroy(&np->n_mtx);
  279                 lockdestroy(&np->n_excl);
  280                 free(nfhp, M_NFSFH);
  281                 if (np->n_v4 != NULL)
  282                         free(np->n_v4, M_NFSV4NODE);
  283                 uma_zfree(newnfsnode_zone, np);
  284                 return (error);
  285         }
  286         error = vfs_hash_insert(vp, hash, lkflags, 
  287             td, &nvp, newnfs_vncmpf, nfhp);
  288         if (error)
  289                 return (error);
  290         if (nvp != NULL) {
  291                 *npp = VTONFS(nvp);
  292                 /* vfs_hash_insert() vput()'s the losing vnode */
  293                 return (0);
  294         }
  295         *npp = np;
  296 
  297         return (0);
  298 }
  299 
  300 /*
  301  * Another variant of nfs_nget(). This one is only used by reopen. It
  302  * takes almost the same args as nfs_nget(), but only succeeds if an entry
  303  * exists in the cache. (Since files should already be "open" with a
  304  * vnode ref cnt on the node when reopen calls this, it should always
  305  * succeed.)
  306  * Also, don't get a vnode lock, since it may already be locked by some
  307  * other process that is handling it. This is ok, since all other threads
  308  * on the client are blocked by the nfsc_lock being exclusively held by the
  309  * caller of this function.
  310  */
  311 int
  312 nfscl_ngetreopen(struct mount *mntp, u_int8_t *fhp, int fhsize,
  313     struct thread *td, struct nfsnode **npp)
  314 {
  315         struct vnode *nvp;
  316         u_int hash;
  317         struct nfsfh *nfhp;
  318         int error;
  319 
  320         *npp = NULL;
  321         /* For forced dismounts, just return error. */
  322         if (NFSCL_FORCEDISM(mntp))
  323                 return (EINTR);
  324         nfhp = malloc(sizeof (struct nfsfh) + fhsize,
  325             M_NFSFH, M_WAITOK);
  326         bcopy(fhp, &nfhp->nfh_fh[0], fhsize);
  327         nfhp->nfh_len = fhsize;
  328 
  329         hash = fnv_32_buf(fhp, fhsize, FNV1_32_INIT);
  330 
  331         /*
  332          * First, try to get the vnode locked, but don't block for the lock.
  333          */
  334         error = vfs_hash_get(mntp, hash, (LK_EXCLUSIVE | LK_NOWAIT), td, &nvp,
  335             newnfs_vncmpf, nfhp);
  336         if (error == 0 && nvp != NULL) {
  337                 NFSVOPUNLOCK(nvp, 0);
  338         } else if (error == EBUSY) {
  339                 /*
  340                  * It is safe so long as a vflush() with
  341                  * FORCECLOSE has not been done. Since the Renew thread is
  342                  * stopped and the MNTK_UNMOUNTF flag is set before doing
  343                  * a vflush() with FORCECLOSE, we should be ok here.
  344                  */
  345                 if (NFSCL_FORCEDISM(mntp))
  346                         error = EINTR;
  347                 else {
  348                         vfs_hash_ref(mntp, hash, td, &nvp, newnfs_vncmpf, nfhp);
  349                         if (nvp == NULL) {
  350                                 error = ENOENT;
  351                         } else if ((nvp->v_iflag & VI_DOOMED) != 0) {
  352                                 error = ENOENT;
  353                                 vrele(nvp);
  354                         } else {
  355                                 error = 0;
  356                         }
  357                 }
  358         }
  359         free(nfhp, M_NFSFH);
  360         if (error)
  361                 return (error);
  362         if (nvp != NULL) {
  363                 *npp = VTONFS(nvp);
  364                 return (0);
  365         }
  366         return (EINVAL);
  367 }
  368 
  369 static void
  370 nfscl_warn_fileid(struct nfsmount *nmp, struct nfsvattr *oldnap,
  371     struct nfsvattr *newnap)
  372 {
  373         int off;
  374 
  375         if (ncl_fileid_maxwarnings >= 0 &&
  376             ncl_fileid_nwarnings >= ncl_fileid_maxwarnings)
  377                 return;
  378         off = 0;
  379         if (ncl_fileid_maxwarnings >= 0) {
  380                 if (++ncl_fileid_nwarnings >= ncl_fileid_maxwarnings)
  381                         off = 1;
  382         }
  383 
  384         printf("newnfs: server '%s' error: fileid changed. "
  385             "fsid %jx:%jx: expected fileid %#jx, got %#jx. "
  386             "(BROKEN NFS SERVER OR MIDDLEWARE)\n",
  387             nmp->nm_com.nmcom_hostname,
  388             (uintmax_t)nmp->nm_fsid[0],
  389             (uintmax_t)nmp->nm_fsid[1],
  390             (uintmax_t)oldnap->na_fileid,
  391             (uintmax_t)newnap->na_fileid);
  392 
  393         if (off)
  394                 printf("newnfs: Logged %d times about fileid corruption; "
  395                     "going quiet to avoid spamming logs excessively. (Limit "
  396                     "is: %d).\n", ncl_fileid_nwarnings,
  397                     ncl_fileid_maxwarnings);
  398 }
  399 
  400 /*
  401  * Load the attribute cache (that lives in the nfsnode entry) with
  402  * the attributes of the second argument and
  403  * Iff vaper not NULL
  404  *    copy the attributes to *vaper
  405  * Similar to nfs_loadattrcache(), except the attributes are passed in
  406  * instead of being parsed out of the mbuf list.
  407  */
  408 int
  409 nfscl_loadattrcache(struct vnode **vpp, struct nfsvattr *nap, void *nvaper,
  410     void *stuff, int writeattr, int dontshrink)
  411 {
  412         struct vnode *vp = *vpp;
  413         struct vattr *vap, *nvap = &nap->na_vattr, *vaper = nvaper;
  414         struct nfsnode *np;
  415         struct nfsmount *nmp;
  416         struct timespec mtime_save;
  417         u_quad_t nsize;
  418         int setnsize, error, force_fid_err;
  419 
  420         error = 0;
  421         setnsize = 0;
  422         nsize = 0;
  423 
  424         /*
  425          * If v_type == VNON it is a new node, so fill in the v_type,
  426          * n_mtime fields. Check to see if it represents a special 
  427          * device, and if so, check for a possible alias. Once the
  428          * correct vnode has been obtained, fill in the rest of the
  429          * information.
  430          */
  431         np = VTONFS(vp);
  432         NFSLOCKNODE(np);
  433         if (vp->v_type != nvap->va_type) {
  434                 vp->v_type = nvap->va_type;
  435                 if (vp->v_type == VFIFO)
  436                         vp->v_op = &newnfs_fifoops;
  437                 np->n_mtime = nvap->va_mtime;
  438         }
  439         nmp = VFSTONFS(vp->v_mount);
  440         vap = &np->n_vattr.na_vattr;
  441         mtime_save = vap->va_mtime;
  442         if (writeattr) {
  443                 np->n_vattr.na_filerev = nap->na_filerev;
  444                 np->n_vattr.na_size = nap->na_size;
  445                 np->n_vattr.na_mtime = nap->na_mtime;
  446                 np->n_vattr.na_ctime = nap->na_ctime;
  447                 np->n_vattr.na_fsid = nap->na_fsid;
  448                 np->n_vattr.na_mode = nap->na_mode;
  449         } else {
  450                 force_fid_err = 0;
  451                 KFAIL_POINT_ERROR(DEBUG_FP, nfscl_force_fileid_warning,
  452                     force_fid_err);
  453                 /*
  454                  * BROKEN NFS SERVER OR MIDDLEWARE
  455                  *
  456                  * Certain NFS servers (certain old proprietary filers ca.
  457                  * 2006) or broken middleboxes (e.g. WAN accelerator products)
  458                  * will respond to GETATTR requests with results for a
  459                  * different fileid.
  460                  *
  461                  * The WAN accelerator we've observed not only serves stale
  462                  * cache results for a given file, it also occasionally serves
  463                  * results for wholly different files.  This causes surprising
  464                  * problems; for example the cached size attribute of a file
  465                  * may truncate down and then back up, resulting in zero
  466                  * regions in file contents read by applications.  We observed
  467                  * this reliably with Clang and .c files during parallel build.
  468                  * A pcap revealed packet fragmentation and GETATTR RPC
  469                  * responses with wholly wrong fileids.
  470                  */
  471                 if ((np->n_vattr.na_fileid != 0 &&
  472                      np->n_vattr.na_fileid != nap->na_fileid) ||
  473                     force_fid_err) {
  474                         nfscl_warn_fileid(nmp, &np->n_vattr, nap);
  475                         error = EIDRM;
  476                         goto out;
  477                 }
  478                 NFSBCOPY((caddr_t)nap, (caddr_t)&np->n_vattr,
  479                     sizeof (struct nfsvattr));
  480         }
  481 
  482         /*
  483          * For NFSv4, if the node's fsid is not equal to the mount point's
  484          * fsid, return the low order 32bits of the node's fsid. This
  485          * allows getcwd(3) to work. There is a chance that the fsid might
  486          * be the same as a local fs, but since this is in an NFS mount
  487          * point, I don't think that will cause any problems?
  488          */
  489         if (NFSHASNFSV4(nmp) && NFSHASHASSETFSID(nmp) &&
  490             (nmp->nm_fsid[0] != np->n_vattr.na_filesid[0] ||
  491              nmp->nm_fsid[1] != np->n_vattr.na_filesid[1])) {
  492                 /*
  493                  * va_fsid needs to be set to some value derived from
  494                  * np->n_vattr.na_filesid that is not equal
  495                  * vp->v_mount->mnt_stat.f_fsid[0], so that it changes
  496                  * from the value used for the top level server volume
  497                  * in the mounted subtree.
  498                  */
  499                 vn_fsid(vp, vap);
  500                 if ((uint32_t)vap->va_fsid == np->n_vattr.na_filesid[0])
  501                         vap->va_fsid = hash32_buf(
  502                             np->n_vattr.na_filesid, 2 * sizeof(uint64_t), 0);
  503         } else
  504                 vn_fsid(vp, vap);
  505         np->n_attrstamp = time_second;
  506         if (vap->va_size != np->n_size) {
  507                 if (vap->va_type == VREG) {
  508                         if (dontshrink && vap->va_size < np->n_size) {
  509                                 /*
  510                                  * We've been told not to shrink the file;
  511                                  * zero np->n_attrstamp to indicate that
  512                                  * the attributes are stale.
  513                                  */
  514                                 vap->va_size = np->n_size;
  515                                 np->n_attrstamp = 0;
  516                                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
  517                                 vnode_pager_setsize(vp, np->n_size);
  518                         } else if (np->n_flag & NMODIFIED) {
  519                                 /*
  520                                  * We've modified the file: Use the larger
  521                                  * of our size, and the server's size.
  522                                  */
  523                                 if (vap->va_size < np->n_size) {
  524                                         vap->va_size = np->n_size;
  525                                 } else {
  526                                         np->n_size = vap->va_size;
  527                                         np->n_flag |= NSIZECHANGED;
  528                                 }
  529                                 vnode_pager_setsize(vp, np->n_size);
  530                         } else if (vap->va_size < np->n_size) {
  531                                 /*
  532                                  * When shrinking the size, the call to
  533                                  * vnode_pager_setsize() cannot be done
  534                                  * with the mutex held, so delay it until
  535                                  * after the mtx_unlock call.
  536                                  */
  537                                 nsize = np->n_size = vap->va_size;
  538                                 np->n_flag |= NSIZECHANGED;
  539                                 setnsize = 1;
  540                         } else {
  541                                 np->n_size = vap->va_size;
  542                                 np->n_flag |= NSIZECHANGED;
  543                                 vnode_pager_setsize(vp, np->n_size);
  544                         }
  545                 } else {
  546                         np->n_size = vap->va_size;
  547                 }
  548         }
  549         /*
  550          * The following checks are added to prevent a race between (say)
  551          * a READDIR+ and a WRITE. 
  552          * READDIR+, WRITE requests sent out.
  553          * READDIR+ resp, WRITE resp received on client.
  554          * However, the WRITE resp was handled before the READDIR+ resp
  555          * causing the post op attrs from the write to be loaded first
  556          * and the attrs from the READDIR+ to be loaded later. If this 
  557          * happens, we have stale attrs loaded into the attrcache.
  558          * We detect this by for the mtime moving back. We invalidate the 
  559          * attrcache when this happens.
  560          */
  561         if (timespeccmp(&mtime_save, &vap->va_mtime, >)) {
  562                 /* Size changed or mtime went backwards */
  563                 np->n_attrstamp = 0;
  564                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
  565         }
  566         if (vaper != NULL) {
  567                 NFSBCOPY((caddr_t)vap, (caddr_t)vaper, sizeof(*vap));
  568                 if (np->n_flag & NCHG) {
  569                         if (np->n_flag & NACC)
  570                                 vaper->va_atime = np->n_atim;
  571                         if (np->n_flag & NUPD)
  572                                 vaper->va_mtime = np->n_mtim;
  573                 }
  574         }
  575 
  576 out:
  577 #ifdef KDTRACE_HOOKS
  578         if (np->n_attrstamp != 0)
  579                 KDTRACE_NFS_ATTRCACHE_LOAD_DONE(vp, vap, error);
  580 #endif
  581         NFSUNLOCKNODE(np);
  582         if (setnsize)
  583                 vnode_pager_setsize(vp, nsize);
  584         return (error);
  585 }
  586 
  587 /*
  588  * Fill in the client id name. For these bytes:
  589  * 1 - they must be unique
  590  * 2 - they should be persistent across client reboots
  591  * 1 is more critical than 2
  592  * Use the mount point's unique id plus either the uuid or, if that
  593  * isn't set, random junk.
  594  */
  595 void
  596 nfscl_fillclid(u_int64_t clval, char *uuid, u_int8_t *cp, u_int16_t idlen)
  597 {
  598         int uuidlen;
  599 
  600         /*
  601          * First, put in the 64bit mount point identifier.
  602          */
  603         if (idlen >= sizeof (u_int64_t)) {
  604                 NFSBCOPY((caddr_t)&clval, cp, sizeof (u_int64_t));
  605                 cp += sizeof (u_int64_t);
  606                 idlen -= sizeof (u_int64_t);
  607         }
  608 
  609         /*
  610          * If uuid is non-zero length, use it.
  611          */
  612         uuidlen = strlen(uuid);
  613         if (uuidlen > 0 && idlen >= uuidlen) {
  614                 NFSBCOPY(uuid, cp, uuidlen);
  615                 cp += uuidlen;
  616                 idlen -= uuidlen;
  617         }
  618 
  619         /*
  620          * This only normally happens if the uuid isn't set.
  621          */
  622         while (idlen > 0) {
  623                 *cp++ = (u_int8_t)(arc4random() % 256);
  624                 idlen--;
  625         }
  626 }
  627 
  628 /*
  629  * Fill in a lock owner name. For now, pid + the process's creation time.
  630  */
  631 void
  632 nfscl_filllockowner(void *id, u_int8_t *cp, int flags)
  633 {
  634         union {
  635                 u_int32_t       lval;
  636                 u_int8_t        cval[4];
  637         } tl;
  638         struct proc *p;
  639 
  640         if (id == NULL) {
  641                 /* Return the single open_owner of all 0 bytes. */
  642                 bzero(cp, NFSV4CL_LOCKNAMELEN);
  643                 return;
  644         }
  645         if ((flags & F_POSIX) != 0) {
  646                 p = (struct proc *)id;
  647                 tl.lval = p->p_pid;
  648                 *cp++ = tl.cval[0];
  649                 *cp++ = tl.cval[1];
  650                 *cp++ = tl.cval[2];
  651                 *cp++ = tl.cval[3];
  652                 tl.lval = p->p_stats->p_start.tv_sec;
  653                 *cp++ = tl.cval[0];
  654                 *cp++ = tl.cval[1];
  655                 *cp++ = tl.cval[2];
  656                 *cp++ = tl.cval[3];
  657                 tl.lval = p->p_stats->p_start.tv_usec;
  658                 *cp++ = tl.cval[0];
  659                 *cp++ = tl.cval[1];
  660                 *cp++ = tl.cval[2];
  661                 *cp = tl.cval[3];
  662         } else if ((flags & F_FLOCK) != 0) {
  663                 bcopy(&id, cp, sizeof(id));
  664                 bzero(&cp[sizeof(id)], NFSV4CL_LOCKNAMELEN - sizeof(id));
  665         } else {
  666                 printf("nfscl_filllockowner: not F_POSIX or F_FLOCK\n");
  667                 bzero(cp, NFSV4CL_LOCKNAMELEN);
  668         }
  669 }
  670 
  671 /*
  672  * Find the parent process for the thread passed in as an argument.
  673  * If none exists, return NULL, otherwise return a thread for the parent.
  674  * (Can be any of the threads, since it is only used for td->td_proc.)
  675  */
  676 NFSPROC_T *
  677 nfscl_getparent(struct thread *td)
  678 {
  679         struct proc *p;
  680         struct thread *ptd;
  681 
  682         if (td == NULL)
  683                 return (NULL);
  684         p = td->td_proc;
  685         if (p->p_pid == 0)
  686                 return (NULL);
  687         p = p->p_pptr;
  688         if (p == NULL)
  689                 return (NULL);
  690         ptd = TAILQ_FIRST(&p->p_threads);
  691         return (ptd);
  692 }
  693 
  694 /*
  695  * Start up the renew kernel thread.
  696  */
  697 static void
  698 start_nfscl(void *arg)
  699 {
  700         struct nfsclclient *clp;
  701         struct thread *td;
  702 
  703         clp = (struct nfsclclient *)arg;
  704         td = TAILQ_FIRST(&clp->nfsc_renewthread->p_threads);
  705         nfscl_renewthread(clp, td);
  706         kproc_exit(0);
  707 }
  708 
  709 void
  710 nfscl_start_renewthread(struct nfsclclient *clp)
  711 {
  712 
  713         kproc_create(start_nfscl, (void *)clp, &clp->nfsc_renewthread, 0, 0,
  714             "nfscl");
  715 }
  716 
  717 /*
  718  * Handle wcc_data.
  719  * For NFSv4, it assumes that nfsv4_wccattr() was used to set up the getattr
  720  * as the first Op after PutFH.
  721  * (For NFSv4, the postop attributes are after the Op, so they can't be
  722  *  parsed here. A separate call to nfscl_postop_attr() is required.)
  723  */
  724 int
  725 nfscl_wcc_data(struct nfsrv_descript *nd, struct vnode *vp,
  726     struct nfsvattr *nap, int *flagp, int *wccflagp, void *stuff)
  727 {
  728         u_int32_t *tl;
  729         struct nfsnode *np = VTONFS(vp);
  730         struct nfsvattr nfsva;
  731         int error = 0;
  732 
  733         if (wccflagp != NULL)
  734                 *wccflagp = 0;
  735         if (nd->nd_flag & ND_NFSV3) {
  736                 *flagp = 0;
  737                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
  738                 if (*tl == newnfs_true) {
  739                         NFSM_DISSECT(tl, u_int32_t *, 6 * NFSX_UNSIGNED);
  740                         if (wccflagp != NULL) {
  741                                 mtx_lock(&np->n_mtx);
  742                                 *wccflagp = (np->n_mtime.tv_sec ==
  743                                     fxdr_unsigned(u_int32_t, *(tl + 2)) &&
  744                                     np->n_mtime.tv_nsec ==
  745                                     fxdr_unsigned(u_int32_t, *(tl + 3)));
  746                                 mtx_unlock(&np->n_mtx);
  747                         }
  748                 }
  749                 error = nfscl_postop_attr(nd, nap, flagp, stuff);
  750                 if (wccflagp != NULL && *flagp == 0)
  751                         *wccflagp = 0;
  752         } else if ((nd->nd_flag & (ND_NOMOREDATA | ND_NFSV4 | ND_V4WCCATTR))
  753             == (ND_NFSV4 | ND_V4WCCATTR)) {
  754                 error = nfsv4_loadattr(nd, NULL, &nfsva, NULL,
  755                     NULL, 0, NULL, NULL, NULL, NULL, NULL, 0,
  756                     NULL, NULL, NULL, NULL, NULL);
  757                 if (error)
  758                         return (error);
  759                 /*
  760                  * Get rid of Op# and status for next op.
  761                  */
  762                 NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
  763                 if (*++tl)
  764                         nd->nd_flag |= ND_NOMOREDATA;
  765                 if (wccflagp != NULL &&
  766                     nfsva.na_vattr.va_mtime.tv_sec != 0) {
  767                         mtx_lock(&np->n_mtx);
  768                         *wccflagp = (np->n_mtime.tv_sec ==
  769                             nfsva.na_vattr.va_mtime.tv_sec &&
  770                             np->n_mtime.tv_nsec ==
  771                             nfsva.na_vattr.va_mtime.tv_sec);
  772                         mtx_unlock(&np->n_mtx);
  773                 }
  774         }
  775 nfsmout:
  776         return (error);
  777 }
  778 
  779 /*
  780  * Get postop attributes.
  781  */
  782 int
  783 nfscl_postop_attr(struct nfsrv_descript *nd, struct nfsvattr *nap, int *retp,
  784     void *stuff)
  785 {
  786         u_int32_t *tl;
  787         int error = 0;
  788 
  789         *retp = 0;
  790         if (nd->nd_flag & ND_NOMOREDATA)
  791                 return (error);
  792         if (nd->nd_flag & ND_NFSV3) {
  793                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
  794                 *retp = fxdr_unsigned(int, *tl);
  795         } else if (nd->nd_flag & ND_NFSV4) {
  796                 /*
  797                  * For NFSv4, the postop attr are at the end, so no point
  798                  * in looking if nd_repstat != 0.
  799                  */
  800                 if (!nd->nd_repstat) {
  801                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
  802                         if (*(tl + 1))
  803                                 /* should never happen since nd_repstat != 0 */
  804                                 nd->nd_flag |= ND_NOMOREDATA;
  805                         else
  806                                 *retp = 1;
  807                 }
  808         } else if (!nd->nd_repstat) {
  809                 /* For NFSv2, the attributes are here iff nd_repstat == 0 */
  810                 *retp = 1;
  811         }
  812         if (*retp) {
  813                 error = nfsm_loadattr(nd, nap);
  814                 if (error)
  815                         *retp = 0;
  816         }
  817 nfsmout:
  818         return (error);
  819 }
  820 
  821 /*
  822  * nfscl_request() - mostly a wrapper for newnfs_request().
  823  */
  824 int
  825 nfscl_request(struct nfsrv_descript *nd, struct vnode *vp, NFSPROC_T *p,
  826     struct ucred *cred, void *stuff)
  827 {
  828         int ret, vers;
  829         struct nfsmount *nmp;
  830 
  831         nmp = VFSTONFS(vp->v_mount);
  832         if (nd->nd_flag & ND_NFSV4)
  833                 vers = NFS_VER4;
  834         else if (nd->nd_flag & ND_NFSV3)
  835                 vers = NFS_VER3;
  836         else
  837                 vers = NFS_VER2;
  838         ret = newnfs_request(nd, nmp, NULL, &nmp->nm_sockreq, vp, p, cred,
  839                 NFS_PROG, vers, NULL, 1, NULL, NULL);
  840         return (ret);
  841 }
  842 
  843 /*
  844  * fill in this bsden's variant of statfs using nfsstatfs.
  845  */
  846 void
  847 nfscl_loadsbinfo(struct nfsmount *nmp, struct nfsstatfs *sfp, void *statfs)
  848 {
  849         struct statfs *sbp = (struct statfs *)statfs;
  850 
  851         if (nmp->nm_flag & (NFSMNT_NFSV3 | NFSMNT_NFSV4)) {
  852                 sbp->f_bsize = NFS_FABLKSIZE;
  853                 sbp->f_blocks = sfp->sf_tbytes / NFS_FABLKSIZE;
  854                 sbp->f_bfree = sfp->sf_fbytes / NFS_FABLKSIZE;
  855                 /*
  856                  * Although sf_abytes is uint64_t and f_bavail is int64_t,
  857                  * the value after dividing by NFS_FABLKSIZE is small
  858                  * enough that it will fit in 63bits, so it is ok to
  859                  * assign it to f_bavail without fear that it will become
  860                  * negative.
  861                  */
  862                 sbp->f_bavail = sfp->sf_abytes / NFS_FABLKSIZE;
  863                 sbp->f_files = sfp->sf_tfiles;
  864                 /* Since f_ffree is int64_t, clip it to 63bits. */
  865                 if (sfp->sf_ffiles > INT64_MAX)
  866                         sbp->f_ffree = INT64_MAX;
  867                 else
  868                         sbp->f_ffree = sfp->sf_ffiles;
  869         } else if ((nmp->nm_flag & NFSMNT_NFSV4) == 0) {
  870                 /*
  871                  * The type casts to (int32_t) ensure that this code is
  872                  * compatible with the old NFS client, in that it will
  873                  * propagate bit31 to the high order bits. This may or may
  874                  * not be correct for NFSv2, but since it is a legacy
  875                  * environment, I'd rather retain backwards compatibility.
  876                  */
  877                 sbp->f_bsize = (int32_t)sfp->sf_bsize;
  878                 sbp->f_blocks = (int32_t)sfp->sf_blocks;
  879                 sbp->f_bfree = (int32_t)sfp->sf_bfree;
  880                 sbp->f_bavail = (int32_t)sfp->sf_bavail;
  881                 sbp->f_files = 0;
  882                 sbp->f_ffree = 0;
  883         }
  884 }
  885 
  886 /*
  887  * Use the fsinfo stuff to update the mount point.
  888  */
  889 void
  890 nfscl_loadfsinfo(struct nfsmount *nmp, struct nfsfsinfo *fsp)
  891 {
  892 
  893         if ((nmp->nm_wsize == 0 || fsp->fs_wtpref < nmp->nm_wsize) &&
  894             fsp->fs_wtpref >= NFS_FABLKSIZE)
  895                 nmp->nm_wsize = (fsp->fs_wtpref + NFS_FABLKSIZE - 1) &
  896                     ~(NFS_FABLKSIZE - 1);
  897         if (fsp->fs_wtmax < nmp->nm_wsize && fsp->fs_wtmax > 0) {
  898                 nmp->nm_wsize = fsp->fs_wtmax & ~(NFS_FABLKSIZE - 1);
  899                 if (nmp->nm_wsize == 0)
  900                         nmp->nm_wsize = fsp->fs_wtmax;
  901         }
  902         if (nmp->nm_wsize < NFS_FABLKSIZE)
  903                 nmp->nm_wsize = NFS_FABLKSIZE;
  904         if ((nmp->nm_rsize == 0 || fsp->fs_rtpref < nmp->nm_rsize) &&
  905             fsp->fs_rtpref >= NFS_FABLKSIZE)
  906                 nmp->nm_rsize = (fsp->fs_rtpref + NFS_FABLKSIZE - 1) &
  907                     ~(NFS_FABLKSIZE - 1);
  908         if (fsp->fs_rtmax < nmp->nm_rsize && fsp->fs_rtmax > 0) {
  909                 nmp->nm_rsize = fsp->fs_rtmax & ~(NFS_FABLKSIZE - 1);
  910                 if (nmp->nm_rsize == 0)
  911                         nmp->nm_rsize = fsp->fs_rtmax;
  912         }
  913         if (nmp->nm_rsize < NFS_FABLKSIZE)
  914                 nmp->nm_rsize = NFS_FABLKSIZE;
  915         if ((nmp->nm_readdirsize == 0 || fsp->fs_dtpref < nmp->nm_readdirsize)
  916             && fsp->fs_dtpref >= NFS_DIRBLKSIZ)
  917                 nmp->nm_readdirsize = (fsp->fs_dtpref + NFS_DIRBLKSIZ - 1) &
  918                     ~(NFS_DIRBLKSIZ - 1);
  919         if (fsp->fs_rtmax < nmp->nm_readdirsize && fsp->fs_rtmax > 0) {
  920                 nmp->nm_readdirsize = fsp->fs_rtmax & ~(NFS_DIRBLKSIZ - 1);
  921                 if (nmp->nm_readdirsize == 0)
  922                         nmp->nm_readdirsize = fsp->fs_rtmax;
  923         }
  924         if (nmp->nm_readdirsize < NFS_DIRBLKSIZ)
  925                 nmp->nm_readdirsize = NFS_DIRBLKSIZ;
  926         if (fsp->fs_maxfilesize > 0 &&
  927             fsp->fs_maxfilesize < nmp->nm_maxfilesize)
  928                 nmp->nm_maxfilesize = fsp->fs_maxfilesize;
  929         nmp->nm_mountp->mnt_stat.f_iosize = newnfs_iosize(nmp);
  930         nmp->nm_state |= NFSSTA_GOTFSINFO;
  931 }
  932 
  933 /*
  934  * Lookups source address which should be used to communicate with
  935  * @nmp and stores it inside @pdst.
  936  *
  937  * Returns 0 on success.
  938  */
  939 u_int8_t *
  940 nfscl_getmyip(struct nfsmount *nmp, struct in6_addr *paddr, int *isinet6p)
  941 {
  942 #if defined(INET6) || defined(INET)
  943         int error, fibnum;
  944 
  945         fibnum = curthread->td_proc->p_fibnum;
  946 #endif
  947 #ifdef INET
  948         if (nmp->nm_nam->sa_family == AF_INET) {
  949                 struct sockaddr_in *sin;
  950                 struct nhop4_extended nh_ext;
  951 
  952                 sin = (struct sockaddr_in *)nmp->nm_nam;
  953                 CURVNET_SET(CRED_TO_VNET(nmp->nm_sockreq.nr_cred));
  954                 error = fib4_lookup_nh_ext(fibnum, sin->sin_addr, 0, 0,
  955                     &nh_ext);
  956                 CURVNET_RESTORE();
  957                 if (error != 0)
  958                         return (NULL);
  959 
  960                 if (IN_LOOPBACK(ntohl(nh_ext.nh_src.s_addr))) {
  961                         /* Ignore loopback addresses */
  962                         return (NULL);
  963                 }
  964 
  965                 *isinet6p = 0;
  966                 *((struct in_addr *)paddr) = nh_ext.nh_src;
  967 
  968                 return (u_int8_t *)paddr;
  969         }
  970 #endif
  971 #ifdef INET6
  972         if (nmp->nm_nam->sa_family == AF_INET6) {
  973                 struct sockaddr_in6 *sin6;
  974 
  975                 sin6 = (struct sockaddr_in6 *)nmp->nm_nam;
  976 
  977                 CURVNET_SET(CRED_TO_VNET(nmp->nm_sockreq.nr_cred));
  978                 error = in6_selectsrc_addr(fibnum, &sin6->sin6_addr,
  979                     sin6->sin6_scope_id, NULL, paddr, NULL);
  980                 CURVNET_RESTORE();
  981                 if (error != 0)
  982                         return (NULL);
  983 
  984                 if (IN6_IS_ADDR_LOOPBACK(paddr))
  985                         return (NULL);
  986 
  987                 /* Scope is embedded in */
  988                 *isinet6p = 1;
  989 
  990                 return (u_int8_t *)paddr;
  991         }
  992 #endif
  993         return (NULL);
  994 }
  995 
  996 /*
  997  * Copy NFS uid, gids from the cred structure.
  998  */
  999 void
 1000 newnfs_copyincred(struct ucred *cr, struct nfscred *nfscr)
 1001 {
 1002         int i;
 1003 
 1004         KASSERT(cr->cr_ngroups >= 0,
 1005             ("newnfs_copyincred: negative cr_ngroups"));
 1006         nfscr->nfsc_uid = cr->cr_uid;
 1007         nfscr->nfsc_ngroups = MIN(cr->cr_ngroups, NFS_MAXGRPS + 1);
 1008         for (i = 0; i < nfscr->nfsc_ngroups; i++)
 1009                 nfscr->nfsc_groups[i] = cr->cr_groups[i];
 1010 }
 1011 
 1012 
 1013 /*
 1014  * Do any client specific initialization.
 1015  */
 1016 void
 1017 nfscl_init(void)
 1018 {
 1019         static int inited = 0;
 1020 
 1021         if (inited)
 1022                 return;
 1023         inited = 1;
 1024         nfscl_inited = 1;
 1025         ncl_pbuf_zone = pbuf_zsecond_create("nfspbuf", nswbuf / 2);
 1026 }
 1027 
 1028 /*
 1029  * Check each of the attributes to be set, to ensure they aren't already
 1030  * the correct value. Disable setting ones already correct.
 1031  */
 1032 int
 1033 nfscl_checksattr(struct vattr *vap, struct nfsvattr *nvap)
 1034 {
 1035 
 1036         if (vap->va_mode != (mode_t)VNOVAL) {
 1037                 if (vap->va_mode == nvap->na_mode)
 1038                         vap->va_mode = (mode_t)VNOVAL;
 1039         }
 1040         if (vap->va_uid != (uid_t)VNOVAL) {
 1041                 if (vap->va_uid == nvap->na_uid)
 1042                         vap->va_uid = (uid_t)VNOVAL;
 1043         }
 1044         if (vap->va_gid != (gid_t)VNOVAL) {
 1045                 if (vap->va_gid == nvap->na_gid)
 1046                         vap->va_gid = (gid_t)VNOVAL;
 1047         }
 1048         if (vap->va_size != VNOVAL) {
 1049                 if (vap->va_size == nvap->na_size)
 1050                         vap->va_size = VNOVAL;
 1051         }
 1052 
 1053         /*
 1054          * We are normally called with only a partially initialized
 1055          * VAP.  Since the NFSv3 spec says that server may use the
 1056          * file attributes to store the verifier, the spec requires
 1057          * us to do a SETATTR RPC. FreeBSD servers store the verifier
 1058          * in atime, but we can't really assume that all servers will
 1059          * so we ensure that our SETATTR sets both atime and mtime.
 1060          * Set the VA_UTIMES_NULL flag for this case, so that
 1061          * the server's time will be used.  This is needed to
 1062          * work around a bug in some Solaris servers, where
 1063          * setting the time TOCLIENT causes the Setattr RPC
 1064          * to return NFS_OK, but not set va_mode.
 1065          */
 1066         if (vap->va_mtime.tv_sec == VNOVAL) {
 1067                 vfs_timestamp(&vap->va_mtime);
 1068                 vap->va_vaflags |= VA_UTIMES_NULL;
 1069         }
 1070         if (vap->va_atime.tv_sec == VNOVAL)
 1071                 vap->va_atime = vap->va_mtime;
 1072         return (1);
 1073 }
 1074 
 1075 /*
 1076  * Map nfsv4 errors to errno.h errors.
 1077  * The uid and gid arguments are only used for NFSERR_BADOWNER and that
 1078  * error should only be returned for the Open, Create and Setattr Ops.
 1079  * As such, most calls can just pass in 0 for those arguments.
 1080  */
 1081 APPLESTATIC int
 1082 nfscl_maperr(struct thread *td, int error, uid_t uid, gid_t gid)
 1083 {
 1084         struct proc *p;
 1085 
 1086         if (error < 10000 || error >= NFSERR_STALEWRITEVERF)
 1087                 return (error);
 1088         if (td != NULL)
 1089                 p = td->td_proc;
 1090         else
 1091                 p = NULL;
 1092         switch (error) {
 1093         case NFSERR_BADOWNER:
 1094                 tprintf(p, LOG_INFO,
 1095                     "No name and/or group mapping for uid,gid:(%d,%d)\n",
 1096                     uid, gid);
 1097                 return (EPERM);
 1098         case NFSERR_BADNAME:
 1099         case NFSERR_BADCHAR:
 1100                 printf("nfsv4 char/name not handled by server\n");
 1101                 return (ENOENT);
 1102         case NFSERR_STALECLIENTID:
 1103         case NFSERR_STALESTATEID:
 1104         case NFSERR_EXPIRED:
 1105         case NFSERR_BADSTATEID:
 1106         case NFSERR_BADSESSION:
 1107                 printf("nfsv4 recover err returned %d\n", error);
 1108                 return (EIO);
 1109         case NFSERR_BADHANDLE:
 1110         case NFSERR_SERVERFAULT:
 1111         case NFSERR_BADTYPE:
 1112         case NFSERR_FHEXPIRED:
 1113         case NFSERR_RESOURCE:
 1114         case NFSERR_MOVED:
 1115         case NFSERR_NOFILEHANDLE:
 1116         case NFSERR_MINORVERMISMATCH:
 1117         case NFSERR_OLDSTATEID:
 1118         case NFSERR_BADSEQID:
 1119         case NFSERR_LEASEMOVED:
 1120         case NFSERR_RECLAIMBAD:
 1121         case NFSERR_BADXDR:
 1122         case NFSERR_OPILLEGAL:
 1123                 printf("nfsv4 client/server protocol prob err=%d\n",
 1124                     error);
 1125                 return (EIO);
 1126         default:
 1127                 tprintf(p, LOG_INFO, "nfsv4 err=%d\n", error);
 1128                 return (EIO);
 1129         };
 1130 }
 1131 
 1132 /*
 1133  * Check to see if the process for this owner exists. Return 1 if it doesn't
 1134  * and 0 otherwise.
 1135  */
 1136 int
 1137 nfscl_procdoesntexist(u_int8_t *own)
 1138 {
 1139         union {
 1140                 u_int32_t       lval;
 1141                 u_int8_t        cval[4];
 1142         } tl;
 1143         struct proc *p;
 1144         pid_t pid;
 1145         int i, ret = 0;
 1146 
 1147         /* For the single open_owner of all 0 bytes, just return 0. */
 1148         for (i = 0; i < NFSV4CL_LOCKNAMELEN; i++)
 1149                 if (own[i] != 0)
 1150                         break;
 1151         if (i == NFSV4CL_LOCKNAMELEN)
 1152                 return (0);
 1153 
 1154         tl.cval[0] = *own++;
 1155         tl.cval[1] = *own++;
 1156         tl.cval[2] = *own++;
 1157         tl.cval[3] = *own++;
 1158         pid = tl.lval;
 1159         p = pfind_any_locked(pid);
 1160         if (p == NULL)
 1161                 return (1);
 1162         if (p->p_stats == NULL) {
 1163                 PROC_UNLOCK(p);
 1164                 return (0);
 1165         }
 1166         tl.cval[0] = *own++;
 1167         tl.cval[1] = *own++;
 1168         tl.cval[2] = *own++;
 1169         tl.cval[3] = *own++;
 1170         if (tl.lval != p->p_stats->p_start.tv_sec) {
 1171                 ret = 1;
 1172         } else {
 1173                 tl.cval[0] = *own++;
 1174                 tl.cval[1] = *own++;
 1175                 tl.cval[2] = *own++;
 1176                 tl.cval[3] = *own;
 1177                 if (tl.lval != p->p_stats->p_start.tv_usec)
 1178                         ret = 1;
 1179         }
 1180         PROC_UNLOCK(p);
 1181         return (ret);
 1182 }
 1183 
 1184 /*
 1185  * - nfs pseudo system call for the client
 1186  */
 1187 /*
 1188  * MPSAFE
 1189  */
 1190 static int
 1191 nfssvc_nfscl(struct thread *td, struct nfssvc_args *uap)
 1192 {
 1193         struct file *fp;
 1194         struct nfscbd_args nfscbdarg;
 1195         struct nfsd_nfscbd_args nfscbdarg2;
 1196         struct nameidata nd;
 1197         struct nfscl_dumpmntopts dumpmntopts;
 1198         cap_rights_t rights;
 1199         char *buf;
 1200         int error;
 1201         struct mount *mp;
 1202         struct nfsmount *nmp;
 1203 
 1204         if (uap->flag & NFSSVC_CBADDSOCK) {
 1205                 error = copyin(uap->argp, (caddr_t)&nfscbdarg, sizeof(nfscbdarg));
 1206                 if (error)
 1207                         return (error);
 1208                 /*
 1209                  * Since we don't know what rights might be required,
 1210                  * pretend that we need them all. It is better to be too
 1211                  * careful than too reckless.
 1212                  */
 1213                 error = fget(td, nfscbdarg.sock,
 1214                     cap_rights_init(&rights, CAP_SOCK_CLIENT), &fp);
 1215                 if (error)
 1216                         return (error);
 1217                 if (fp->f_type != DTYPE_SOCKET) {
 1218                         fdrop(fp, td);
 1219                         return (EPERM);
 1220                 }
 1221                 error = nfscbd_addsock(fp);
 1222                 fdrop(fp, td);
 1223                 if (!error && nfscl_enablecallb == 0) {
 1224                         nfsv4_cbport = nfscbdarg.port;
 1225                         nfscl_enablecallb = 1;
 1226                 }
 1227         } else if (uap->flag & NFSSVC_NFSCBD) {
 1228                 if (uap->argp == NULL) 
 1229                         return (EINVAL);
 1230                 error = copyin(uap->argp, (caddr_t)&nfscbdarg2,
 1231                     sizeof(nfscbdarg2));
 1232                 if (error)
 1233                         return (error);
 1234                 error = nfscbd_nfsd(td, &nfscbdarg2);
 1235         } else if (uap->flag & NFSSVC_DUMPMNTOPTS) {
 1236                 error = copyin(uap->argp, &dumpmntopts, sizeof(dumpmntopts));
 1237                 if (error == 0 && (dumpmntopts.ndmnt_blen < 256 ||
 1238                     dumpmntopts.ndmnt_blen > 1024))
 1239                         error = EINVAL;
 1240                 if (error == 0)
 1241                         error = nfsrv_lookupfilename(&nd,
 1242                             dumpmntopts.ndmnt_fname, td);
 1243                 if (error == 0 && strcmp(nd.ni_vp->v_mount->mnt_vfc->vfc_name,
 1244                     "nfs") != 0) {
 1245                         vput(nd.ni_vp);
 1246                         error = EINVAL;
 1247                 }
 1248                 if (error == 0) {
 1249                         buf = malloc(dumpmntopts.ndmnt_blen, M_TEMP, M_WAITOK);
 1250                         nfscl_retopts(VFSTONFS(nd.ni_vp->v_mount), buf,
 1251                             dumpmntopts.ndmnt_blen);
 1252                         vput(nd.ni_vp);
 1253                         error = copyout(buf, dumpmntopts.ndmnt_buf,
 1254                             dumpmntopts.ndmnt_blen);
 1255                         free(buf, M_TEMP);
 1256                 }
 1257         } else if (uap->flag & NFSSVC_FORCEDISM) {
 1258                 buf = malloc(MNAMELEN + 1, M_TEMP, M_WAITOK);
 1259                 error = copyinstr(uap->argp, buf, MNAMELEN + 1, NULL);
 1260                 if (error == 0) {
 1261                         nmp = NULL;
 1262                         mtx_lock(&mountlist_mtx);
 1263                         TAILQ_FOREACH(mp, &mountlist, mnt_list) {
 1264                                 if (strcmp(mp->mnt_stat.f_mntonname, buf) ==
 1265                                     0 && strcmp(mp->mnt_stat.f_fstypename,
 1266                                     "nfs") == 0 && mp->mnt_data != NULL) {
 1267                                         nmp = VFSTONFS(mp);
 1268                                         NFSDDSLOCK();
 1269                                         if (nfsv4_findmirror(nmp) != NULL) {
 1270                                                 NFSDDSUNLOCK();
 1271                                                 error = ENXIO;
 1272                                                 nmp = NULL;
 1273                                                 break;
 1274                                         }
 1275                                         mtx_lock(&nmp->nm_mtx);
 1276                                         if ((nmp->nm_privflag &
 1277                                             NFSMNTP_FORCEDISM) == 0) {
 1278                                                 nmp->nm_privflag |= 
 1279                                                    (NFSMNTP_FORCEDISM |
 1280                                                     NFSMNTP_CANCELRPCS);
 1281                                                 mtx_unlock(&nmp->nm_mtx);
 1282                                         } else {
 1283                                                 mtx_unlock(&nmp->nm_mtx);
 1284                                                 nmp = NULL;
 1285                                         }
 1286                                         NFSDDSUNLOCK();
 1287                                         break;
 1288                                 }
 1289                         }
 1290                         mtx_unlock(&mountlist_mtx);
 1291 
 1292                         if (nmp != NULL) {
 1293                                 /*
 1294                                  * Call newnfs_nmcancelreqs() to cause
 1295                                  * any RPCs in progress on the mount point to
 1296                                  * fail.
 1297                                  * This will cause any process waiting for an
 1298                                  * RPC to complete while holding a vnode lock
 1299                                  * on the mounted-on vnode (such as "df" or
 1300                                  * a non-forced "umount") to fail.
 1301                                  * This will unlock the mounted-on vnode so
 1302                                  * a forced dismount can succeed.
 1303                                  * Then clear NFSMNTP_CANCELRPCS and wakeup(),
 1304                                  * so that nfs_unmount() can complete.
 1305                                  */
 1306                                 newnfs_nmcancelreqs(nmp);
 1307                                 mtx_lock(&nmp->nm_mtx);
 1308                                 nmp->nm_privflag &= ~NFSMNTP_CANCELRPCS;
 1309                                 wakeup(nmp);
 1310                                 mtx_unlock(&nmp->nm_mtx);
 1311                         } else if (error == 0)
 1312                                 error = EINVAL;
 1313                 }
 1314                 free(buf, M_TEMP);
 1315         } else {
 1316                 error = EINVAL;
 1317         }
 1318         return (error);
 1319 }
 1320 
 1321 extern int (*nfsd_call_nfscl)(struct thread *, struct nfssvc_args *);
 1322 
 1323 /*
 1324  * Called once to initialize data structures...
 1325  */
 1326 static int
 1327 nfscl_modevent(module_t mod, int type, void *data)
 1328 {
 1329         int error = 0;
 1330         static int loaded = 0;
 1331 
 1332         switch (type) {
 1333         case MOD_LOAD:
 1334                 if (loaded)
 1335                         return (0);
 1336                 newnfs_portinit();
 1337                 mtx_init(&ncl_iod_mutex, "ncl_iod_mutex", NULL, MTX_DEF);
 1338                 nfscl_init();
 1339                 NFSD_LOCK();
 1340                 nfsrvd_cbinit(0);
 1341                 NFSD_UNLOCK();
 1342                 ncl_call_invalcaches = ncl_invalcaches;
 1343                 nfsd_call_nfscl = nfssvc_nfscl;
 1344                 loaded = 1;
 1345                 break;
 1346 
 1347         case MOD_UNLOAD:
 1348                 if (nfs_numnfscbd != 0) {
 1349                         error = EBUSY;
 1350                         break;
 1351                 }
 1352 
 1353                 /*
 1354                  * XXX: Unloading of nfscl module is unsupported.
 1355                  */
 1356 #if 0
 1357                 ncl_call_invalcaches = NULL;
 1358                 nfsd_call_nfscl = NULL;
 1359                 uma_zdestroy(ncl_pbuf_zone);
 1360                 /* and get rid of the mutexes */
 1361                 mtx_destroy(&ncl_iod_mutex);
 1362                 loaded = 0;
 1363                 break;
 1364 #else
 1365                 /* FALLTHROUGH */
 1366 #endif
 1367         default:
 1368                 error = EOPNOTSUPP;
 1369                 break;
 1370         }
 1371         return error;
 1372 }
 1373 static moduledata_t nfscl_mod = {
 1374         "nfscl",
 1375         nfscl_modevent,
 1376         NULL,
 1377 };
 1378 DECLARE_MODULE(nfscl, nfscl_mod, SI_SUB_VFS, SI_ORDER_FIRST);
 1379 
 1380 /* So that loader and kldload(2) can find us, wherever we are.. */
 1381 MODULE_VERSION(nfscl, 1);
 1382 MODULE_DEPEND(nfscl, nfscommon, 1, 1, 1);
 1383 MODULE_DEPEND(nfscl, krpc, 1, 1, 1);
 1384 MODULE_DEPEND(nfscl, nfssvc, 1, 1, 1);
 1385 MODULE_DEPEND(nfscl, nfslock, 1, 1, 1);
 1386 

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