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("$FreeBSD$");
   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 #include <net/route/nhop.h>
   57 
   58 #include <fs/nfsclient/nfs_kdtrace.h>
   59 
   60 #ifdef KDTRACE_HOOKS
   61 dtrace_nfsclient_attrcache_flush_probe_func_t
   62                 dtrace_nfscl_attrcache_flush_done_probe;
   63 uint32_t        nfscl_attrcache_flush_done_id;
   64 
   65 dtrace_nfsclient_attrcache_get_hit_probe_func_t
   66                 dtrace_nfscl_attrcache_get_hit_probe;
   67 uint32_t        nfscl_attrcache_get_hit_id;
   68 
   69 dtrace_nfsclient_attrcache_get_miss_probe_func_t
   70                 dtrace_nfscl_attrcache_get_miss_probe;
   71 uint32_t        nfscl_attrcache_get_miss_id;
   72 
   73 dtrace_nfsclient_attrcache_load_probe_func_t
   74                 dtrace_nfscl_attrcache_load_done_probe;
   75 uint32_t        nfscl_attrcache_load_done_id;
   76 #endif /* !KDTRACE_HOOKS */
   77 
   78 extern u_int32_t newnfs_true, newnfs_false, newnfs_xdrneg1;
   79 extern struct vop_vector newnfs_vnodeops;
   80 extern struct vop_vector newnfs_fifoops;
   81 extern uma_zone_t newnfsnode_zone;
   82 extern struct buf_ops buf_ops_newnfs;
   83 extern uma_zone_t ncl_pbuf_zone;
   84 extern short nfsv4_cbport;
   85 extern int nfscl_enablecallb;
   86 extern int nfs_numnfscbd;
   87 extern int nfscl_inited;
   88 struct mtx ncl_iod_mutex;
   89 NFSDLOCKMUTEX;
   90 extern struct mtx nfsrv_dslock_mtx;
   91 
   92 extern void (*ncl_call_invalcaches)(struct vnode *);
   93 
   94 SYSCTL_DECL(_vfs_nfs);
   95 static int ncl_fileid_maxwarnings = 10;
   96 SYSCTL_INT(_vfs_nfs, OID_AUTO, fileid_maxwarnings, CTLFLAG_RWTUN,
   97     &ncl_fileid_maxwarnings, 0,
   98     "Limit fileid corruption warnings; 0 is off; -1 is unlimited");
   99 static volatile int ncl_fileid_nwarnings;
  100 
  101 static void nfscl_warn_fileid(struct nfsmount *, struct nfsvattr *,
  102     struct nfsvattr *);
  103 
  104 /*
  105  * Comparison function for vfs_hash functions.
  106  */
  107 int
  108 newnfs_vncmpf(struct vnode *vp, void *arg)
  109 {
  110         struct nfsfh *nfhp = (struct nfsfh *)arg;
  111         struct nfsnode *np = VTONFS(vp);
  112 
  113         if (np->n_fhp->nfh_len != nfhp->nfh_len ||
  114             NFSBCMP(np->n_fhp->nfh_fh, nfhp->nfh_fh, nfhp->nfh_len))
  115                 return (1);
  116         return (0);
  117 }
  118 
  119 /*
  120  * Look up a vnode/nfsnode by file handle.
  121  * Callers must check for mount points!!
  122  * In all cases, a pointer to a
  123  * nfsnode structure is returned.
  124  * This variant takes a "struct nfsfh *" as second argument and uses
  125  * that structure up, either by hanging off the nfsnode or FREEing it.
  126  */
  127 int
  128 nfscl_nget(struct mount *mntp, struct vnode *dvp, struct nfsfh *nfhp,
  129     struct componentname *cnp, struct thread *td, struct nfsnode **npp,
  130     int lkflags)
  131 {
  132         struct nfsnode *np, *dnp;
  133         struct vnode *vp, *nvp;
  134         struct nfsv4node *newd, *oldd;
  135         int error;
  136         u_int hash;
  137         struct nfsmount *nmp;
  138 
  139         nmp = VFSTONFS(mntp);
  140         dnp = VTONFS(dvp);
  141         *npp = NULL;
  142 
  143         hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len, FNV1_32_INIT);
  144 
  145         error = vfs_hash_get(mntp, hash, lkflags,
  146             td, &nvp, newnfs_vncmpf, nfhp);
  147         if (error == 0 && nvp != NULL) {
  148                 /*
  149                  * I believe there is a slight chance that vgonel() could
  150                  * get called on this vnode between when NFSVOPLOCK() drops
  151                  * the VI_LOCK() and vget() acquires it again, so that it
  152                  * hasn't yet had v_usecount incremented. If this were to
  153                  * happen, the VIRF_DOOMED flag would be set, so check for
  154                  * that here. Since we now have the v_usecount incremented,
  155                  * we should be ok until we vrele() it, if the VIRF_DOOMED
  156                  * flag isn't set now.
  157                  */
  158                 VI_LOCK(nvp);
  159                 if (VN_IS_DOOMED(nvp)) {
  160                         VI_UNLOCK(nvp);
  161                         vrele(nvp);
  162                         error = ENOENT;
  163                 } else {
  164                         VI_UNLOCK(nvp);
  165                 }
  166         }
  167         if (error) {
  168                 free(nfhp, M_NFSFH);
  169                 return (error);
  170         }
  171         if (nvp != NULL) {
  172                 np = VTONFS(nvp);
  173                 /*
  174                  * For NFSv4, check to see if it is the same name and
  175                  * replace the name, if it is different.
  176                  */
  177                 oldd = newd = NULL;
  178                 if ((nmp->nm_flag & NFSMNT_NFSV4) && np->n_v4 != NULL &&
  179                     nvp->v_type == VREG &&
  180                     (np->n_v4->n4_namelen != cnp->cn_namelen ||
  181                      NFSBCMP(cnp->cn_nameptr, NFS4NODENAME(np->n_v4),
  182                      cnp->cn_namelen) ||
  183                      dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen ||
  184                      NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
  185                      dnp->n_fhp->nfh_len))) {
  186                     newd = malloc(
  187                         sizeof (struct nfsv4node) + dnp->n_fhp->nfh_len +
  188                         + cnp->cn_namelen - 1, M_NFSV4NODE, M_WAITOK);
  189                     NFSLOCKNODE(np);
  190                     if (newd != NULL && np->n_v4 != NULL && nvp->v_type == VREG
  191                         && (np->n_v4->n4_namelen != cnp->cn_namelen ||
  192                          NFSBCMP(cnp->cn_nameptr, NFS4NODENAME(np->n_v4),
  193                          cnp->cn_namelen) ||
  194                          dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen ||
  195                          NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
  196                          dnp->n_fhp->nfh_len))) {
  197                         oldd = np->n_v4;
  198                         np->n_v4 = newd;
  199                         newd = NULL;
  200                         np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len;
  201                         np->n_v4->n4_namelen = cnp->cn_namelen;
  202                         NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
  203                             dnp->n_fhp->nfh_len);
  204                         NFSBCOPY(cnp->cn_nameptr, NFS4NODENAME(np->n_v4),
  205                             cnp->cn_namelen);
  206                     }
  207                     NFSUNLOCKNODE(np);
  208                 }
  209                 if (newd != NULL)
  210                         free(newd, M_NFSV4NODE);
  211                 if (oldd != NULL)
  212                         free(oldd, M_NFSV4NODE);
  213                 *npp = np;
  214                 free(nfhp, M_NFSFH);
  215                 return (0);
  216         }
  217         np = uma_zalloc(newnfsnode_zone, M_WAITOK | M_ZERO);
  218 
  219         error = getnewvnode(nfs_vnode_tag, mntp, &newnfs_vnodeops, &nvp);
  220         if (error) {
  221                 uma_zfree(newnfsnode_zone, np);
  222                 free(nfhp, M_NFSFH);
  223                 return (error);
  224         }
  225         vp = nvp;
  226         KASSERT(vp->v_bufobj.bo_bsize != 0, ("nfscl_nget: bo_bsize == 0"));
  227         vp->v_bufobj.bo_ops = &buf_ops_newnfs;
  228         vp->v_data = np;
  229         np->n_vnode = vp;
  230         /* 
  231          * Initialize the mutex even if the vnode is going to be a loser.
  232          * This simplifies the logic in reclaim, which can then unconditionally
  233          * destroy the mutex (in the case of the loser, or if hash_insert
  234          * happened to return an error no special casing is needed).
  235          */
  236         mtx_init(&np->n_mtx, "NEWNFSnode lock", NULL, MTX_DEF | MTX_DUPOK);
  237         lockinit(&np->n_excl, PVFS, "nfsupg", VLKTIMEOUT, LK_NOSHARE |
  238             LK_CANRECURSE);
  239 
  240         /* 
  241          * Are we getting the root? If so, make sure the vnode flags
  242          * are correct 
  243          */
  244         if ((nfhp->nfh_len == nmp->nm_fhsize) &&
  245             !bcmp(nfhp->nfh_fh, nmp->nm_fh, nfhp->nfh_len)) {
  246                 if (vp->v_type == VNON)
  247                         vp->v_type = VDIR;
  248                 vp->v_vflag |= VV_ROOT;
  249         }
  250 
  251         vp->v_vflag |= VV_VMSIZEVNLOCK;
  252 
  253         np->n_fhp = nfhp;
  254         /*
  255          * For NFSv4, we have to attach the directory file handle and
  256          * file name, so that Open Ops can be done later.
  257          */
  258         if (nmp->nm_flag & NFSMNT_NFSV4) {
  259                 np->n_v4 = malloc(sizeof (struct nfsv4node)
  260                     + dnp->n_fhp->nfh_len + cnp->cn_namelen - 1, M_NFSV4NODE,
  261                     M_WAITOK);
  262                 np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len;
  263                 np->n_v4->n4_namelen = cnp->cn_namelen;
  264                 NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
  265                     dnp->n_fhp->nfh_len);
  266                 NFSBCOPY(cnp->cn_nameptr, NFS4NODENAME(np->n_v4),
  267                     cnp->cn_namelen);
  268         } else {
  269                 np->n_v4 = NULL;
  270         }
  271 
  272         /*
  273          * NFS supports recursive and shared locking.
  274          */
  275         lockmgr(vp->v_vnlock, LK_EXCLUSIVE | LK_NOWITNESS, NULL);
  276         VN_LOCK_AREC(vp);
  277         VN_LOCK_ASHARE(vp);
  278         error = insmntque(vp, mntp);
  279         if (error != 0) {
  280                 *npp = NULL;
  281                 mtx_destroy(&np->n_mtx);
  282                 lockdestroy(&np->n_excl);
  283                 free(nfhp, M_NFSFH);
  284                 if (np->n_v4 != NULL)
  285                         free(np->n_v4, M_NFSV4NODE);
  286                 uma_zfree(newnfsnode_zone, np);
  287                 return (error);
  288         }
  289         vn_set_state(vp, VSTATE_CONSTRUCTED);
  290         error = vfs_hash_insert(vp, hash, lkflags, 
  291             td, &nvp, newnfs_vncmpf, nfhp);
  292         if (error)
  293                 return (error);
  294         if (nvp != NULL) {
  295                 *npp = VTONFS(nvp);
  296                 /* vfs_hash_insert() vput()'s the losing vnode */
  297                 return (0);
  298         }
  299         *npp = np;
  300 
  301         return (0);
  302 }
  303 
  304 /*
  305  * Another variant of nfs_nget(). This one is only used by reopen. It
  306  * takes almost the same args as nfs_nget(), but only succeeds if an entry
  307  * exists in the cache. (Since files should already be "open" with a
  308  * vnode ref cnt on the node when reopen calls this, it should always
  309  * succeed.)
  310  * Also, don't get a vnode lock, since it may already be locked by some
  311  * other process that is handling it. This is ok, since all other threads
  312  * on the client are blocked by the nfsc_lock being exclusively held by the
  313  * caller of this function.
  314  */
  315 int
  316 nfscl_ngetreopen(struct mount *mntp, u_int8_t *fhp, int fhsize,
  317     struct thread *td, struct nfsnode **npp)
  318 {
  319         struct vnode *nvp;
  320         u_int hash;
  321         struct nfsfh *nfhp;
  322         int error;
  323 
  324         *npp = NULL;
  325         /* For forced dismounts, just return error. */
  326         if (NFSCL_FORCEDISM(mntp))
  327                 return (EINTR);
  328         nfhp = malloc(sizeof (struct nfsfh) + fhsize,
  329             M_NFSFH, M_WAITOK);
  330         bcopy(fhp, &nfhp->nfh_fh[0], fhsize);
  331         nfhp->nfh_len = fhsize;
  332 
  333         hash = fnv_32_buf(fhp, fhsize, FNV1_32_INIT);
  334 
  335         /*
  336          * First, try to get the vnode locked, but don't block for the lock.
  337          */
  338         error = vfs_hash_get(mntp, hash, (LK_EXCLUSIVE | LK_NOWAIT), td, &nvp,
  339             newnfs_vncmpf, nfhp);
  340         if (error == 0 && nvp != NULL) {
  341                 NFSVOPUNLOCK(nvp);
  342         } else if (error == EBUSY) {
  343                 /*
  344                  * It is safe so long as a vflush() with
  345                  * FORCECLOSE has not been done. Since the Renew thread is
  346                  * stopped and the MNTK_UNMOUNTF flag is set before doing
  347                  * a vflush() with FORCECLOSE, we should be ok here.
  348                  */
  349                 if (NFSCL_FORCEDISM(mntp))
  350                         error = EINTR;
  351                 else {
  352                         vfs_hash_ref(mntp, hash, td, &nvp, newnfs_vncmpf, nfhp);
  353                         if (nvp == NULL) {
  354                                 error = ENOENT;
  355                         } else if (VN_IS_DOOMED(nvp)) {
  356                                 error = ENOENT;
  357                                 vrele(nvp);
  358                         } else {
  359                                 error = 0;
  360                         }
  361                 }
  362         }
  363         free(nfhp, M_NFSFH);
  364         if (error)
  365                 return (error);
  366         if (nvp != NULL) {
  367                 *npp = VTONFS(nvp);
  368                 return (0);
  369         }
  370         return (EINVAL);
  371 }
  372 
  373 static void
  374 nfscl_warn_fileid(struct nfsmount *nmp, struct nfsvattr *oldnap,
  375     struct nfsvattr *newnap)
  376 {
  377         int off;
  378 
  379         if (ncl_fileid_maxwarnings >= 0 &&
  380             ncl_fileid_nwarnings >= ncl_fileid_maxwarnings)
  381                 return;
  382         off = 0;
  383         if (ncl_fileid_maxwarnings >= 0) {
  384                 if (++ncl_fileid_nwarnings >= ncl_fileid_maxwarnings)
  385                         off = 1;
  386         }
  387 
  388         printf("newnfs: server '%s' error: fileid changed. "
  389             "fsid %jx:%jx: expected fileid %#jx, got %#jx. "
  390             "(BROKEN NFS SERVER OR MIDDLEWARE)\n",
  391             nmp->nm_com.nmcom_hostname,
  392             (uintmax_t)nmp->nm_fsid[0],
  393             (uintmax_t)nmp->nm_fsid[1],
  394             (uintmax_t)oldnap->na_fileid,
  395             (uintmax_t)newnap->na_fileid);
  396 
  397         if (off)
  398                 printf("newnfs: Logged %d times about fileid corruption; "
  399                     "going quiet to avoid spamming logs excessively. (Limit "
  400                     "is: %d).\n", ncl_fileid_nwarnings,
  401                     ncl_fileid_maxwarnings);
  402 }
  403 
  404 void
  405 ncl_copy_vattr(struct vattr *dst, struct vattr *src)
  406 {
  407         dst->va_type = src->va_type;
  408         dst->va_mode = src->va_mode;
  409         dst->va_nlink = src->va_nlink;
  410         dst->va_uid = src->va_uid;
  411         dst->va_gid = src->va_gid;
  412         dst->va_fsid = src->va_fsid;
  413         dst->va_fileid = src->va_fileid;
  414         dst->va_size = src->va_size;
  415         dst->va_blocksize = src->va_blocksize;
  416         dst->va_atime = src->va_atime;
  417         dst->va_mtime = src->va_mtime;
  418         dst->va_ctime = src->va_ctime;
  419         dst->va_birthtime = src->va_birthtime;
  420         dst->va_gen = src->va_gen;
  421         dst->va_flags = src->va_flags;
  422         dst->va_rdev = src->va_rdev;
  423         dst->va_bytes = src->va_bytes;
  424         dst->va_filerev = src->va_filerev;
  425 }
  426 
  427 /*
  428  * Load the attribute cache (that lives in the nfsnode entry) with
  429  * the attributes of the second argument and
  430  * Iff vaper not NULL
  431  *    copy the attributes to *vaper
  432  * Similar to nfs_loadattrcache(), except the attributes are passed in
  433  * instead of being parsed out of the mbuf list.
  434  */
  435 int
  436 nfscl_loadattrcache(struct vnode **vpp, struct nfsvattr *nap, void *nvaper,
  437     int writeattr, int dontshrink)
  438 {
  439         struct vnode *vp = *vpp;
  440         struct vattr *vap, *nvap = &nap->na_vattr, *vaper = nvaper;
  441         struct nfsnode *np;
  442         struct nfsmount *nmp;
  443         struct timespec mtime_save;
  444         int error, force_fid_err;
  445         dev_t topfsid;
  446 
  447         error = 0;
  448 
  449         /*
  450          * If v_type == VNON it is a new node, so fill in the v_type,
  451          * n_mtime fields. Check to see if it represents a special 
  452          * device, and if so, check for a possible alias. Once the
  453          * correct vnode has been obtained, fill in the rest of the
  454          * information.
  455          */
  456         np = VTONFS(vp);
  457         NFSLOCKNODE(np);
  458         if (vp->v_type != nvap->va_type) {
  459                 vp->v_type = nvap->va_type;
  460                 if (vp->v_type == VFIFO)
  461                         vp->v_op = &newnfs_fifoops;
  462                 np->n_mtime = nvap->va_mtime;
  463         }
  464         nmp = VFSTONFS(vp->v_mount);
  465         vap = &np->n_vattr.na_vattr;
  466         mtime_save = vap->va_mtime;
  467         if (writeattr) {
  468                 np->n_vattr.na_filerev = nap->na_filerev;
  469                 np->n_vattr.na_size = nap->na_size;
  470                 np->n_vattr.na_mtime = nap->na_mtime;
  471                 np->n_vattr.na_ctime = nap->na_ctime;
  472                 np->n_vattr.na_btime = nap->na_btime;
  473                 np->n_vattr.na_fsid = nap->na_fsid;
  474                 np->n_vattr.na_mode = nap->na_mode;
  475         } else {
  476                 force_fid_err = 0;
  477                 KFAIL_POINT_ERROR(DEBUG_FP, nfscl_force_fileid_warning,
  478                     force_fid_err);
  479                 /*
  480                  * BROKEN NFS SERVER OR MIDDLEWARE
  481                  *
  482                  * Certain NFS servers (certain old proprietary filers ca.
  483                  * 2006) or broken middleboxes (e.g. WAN accelerator products)
  484                  * will respond to GETATTR requests with results for a
  485                  * different fileid.
  486                  *
  487                  * The WAN accelerator we've observed not only serves stale
  488                  * cache results for a given file, it also occasionally serves
  489                  * results for wholly different files.  This causes surprising
  490                  * problems; for example the cached size attribute of a file
  491                  * may truncate down and then back up, resulting in zero
  492                  * regions in file contents read by applications.  We observed
  493                  * this reliably with Clang and .c files during parallel build.
  494                  * A pcap revealed packet fragmentation and GETATTR RPC
  495                  * responses with wholly wrong fileids.
  496                  */
  497                 if ((np->n_vattr.na_fileid != 0 &&
  498                      np->n_vattr.na_fileid != nap->na_fileid) ||
  499                     force_fid_err) {
  500                         nfscl_warn_fileid(nmp, &np->n_vattr, nap);
  501                         error = EIDRM;
  502                         goto out;
  503                 }
  504                 NFSBCOPY((caddr_t)nap, (caddr_t)&np->n_vattr,
  505                     sizeof (struct nfsvattr));
  506         }
  507 
  508         /*
  509          * For NFSv4, the server's export may be a tree of file systems
  510          * where a fileno is a unique value within each file system.
  511          * na_filesid[0,1] uniquely identify the server file system
  512          * and nm_fsid[0,1] is the value for the root file system mounted.
  513          * As such, the value of va_fsid generated by vn_fsid() represents
  514          * the root file system on the server and a different value for
  515          * va_fsid is needed for the other server file systems.  This
  516          * va_fsid is ideally unique for all of the server file systems,
  517          * so a 64bit hash on na_filesid[0,1] is calculated.
  518          * Although highly unlikely that the fnv_64_hash() will be
  519          * the same as the root, test for this case and recalculate the hash.
  520          */
  521         vn_fsid(vp, vap);
  522         if (NFSHASNFSV4(nmp) && NFSHASHASSETFSID(nmp) &&
  523             (nmp->nm_fsid[0] != np->n_vattr.na_filesid[0] ||
  524              nmp->nm_fsid[1] != np->n_vattr.na_filesid[1])) {
  525                 topfsid = vap->va_fsid;
  526                 vap->va_fsid = FNV1_64_INIT;
  527                 do {
  528                         vap->va_fsid = fnv_64_buf(np->n_vattr.na_filesid,
  529                             sizeof(np->n_vattr.na_filesid), vap->va_fsid);
  530                 } while (vap->va_fsid == topfsid);
  531         }
  532 
  533         np->n_attrstamp = time_second;
  534         if (vap->va_size != np->n_size) {
  535                 if (vap->va_type == VREG) {
  536                         if (dontshrink && vap->va_size < np->n_size) {
  537                                 /*
  538                                  * We've been told not to shrink the file;
  539                                  * zero np->n_attrstamp to indicate that
  540                                  * the attributes are stale.
  541                                  */
  542                                 vap->va_size = np->n_size;
  543                                 np->n_attrstamp = 0;
  544                                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
  545                         } else if (np->n_flag & NMODIFIED) {
  546                                 /*
  547                                  * We've modified the file: Use the larger
  548                                  * of our size, and the server's size.
  549                                  */
  550                                 if (vap->va_size < np->n_size) {
  551                                         vap->va_size = np->n_size;
  552                                 } else {
  553                                         np->n_size = vap->va_size;
  554                                         np->n_flag |= NSIZECHANGED;
  555                                 }
  556                         } else {
  557                                 np->n_size = vap->va_size;
  558                                 np->n_flag |= NSIZECHANGED;
  559                         }
  560                 } else {
  561                         np->n_size = vap->va_size;
  562                 }
  563         }
  564         /*
  565          * The following checks are added to prevent a race between (say)
  566          * a READDIR+ and a WRITE. 
  567          * READDIR+, WRITE requests sent out.
  568          * READDIR+ resp, WRITE resp received on client.
  569          * However, the WRITE resp was handled before the READDIR+ resp
  570          * causing the post op attrs from the write to be loaded first
  571          * and the attrs from the READDIR+ to be loaded later. If this 
  572          * happens, we have stale attrs loaded into the attrcache.
  573          * We detect this by for the mtime moving back. We invalidate the 
  574          * attrcache when this happens.
  575          */
  576         if (timespeccmp(&mtime_save, &vap->va_mtime, >)) {
  577                 /* Size changed or mtime went backwards */
  578                 np->n_attrstamp = 0;
  579                 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
  580         }
  581         if (vaper != NULL) {
  582                 ncl_copy_vattr(vaper, vap);
  583                 if (np->n_flag & NCHG) {
  584                         if (np->n_flag & NACC)
  585                                 vaper->va_atime = np->n_atim;
  586                         if (np->n_flag & NUPD)
  587                                 vaper->va_mtime = np->n_mtim;
  588                 }
  589         }
  590 
  591 out:
  592 #ifdef KDTRACE_HOOKS
  593         if (np->n_attrstamp != 0)
  594                 KDTRACE_NFS_ATTRCACHE_LOAD_DONE(vp, vap, error);
  595 #endif
  596         (void)ncl_pager_setsize(vp, NULL);
  597         return (error);
  598 }
  599 
  600 /*
  601  * Call vnode_pager_setsize() if the size of the node changed, as
  602  * recorded in nfsnode vs. v_object, or delay the call if notifying
  603  * the pager is not possible at the moment.
  604  *
  605  * If nsizep is non-NULL, the call is delayed and the new node size is
  606  * provided.  Caller should itself call vnode_pager_setsize() if
  607  * function returned true.  If nsizep is NULL, function tries to call
  608  * vnode_pager_setsize() itself if needed and possible, and the nfs
  609  * node is unlocked unconditionally, the return value is not useful.
  610  */
  611 bool
  612 ncl_pager_setsize(struct vnode *vp, u_quad_t *nsizep)
  613 {
  614         struct nfsnode *np;
  615         vm_object_t object;
  616         struct vattr *vap;
  617         u_quad_t nsize;
  618         bool setnsize;
  619 
  620         np = VTONFS(vp);
  621         NFSASSERTNODE(np);
  622 
  623         vap = &np->n_vattr.na_vattr;
  624         nsize = vap->va_size;
  625         object = vp->v_object;
  626         setnsize = false;
  627 
  628         if (object != NULL && nsize != object->un_pager.vnp.vnp_size) {
  629                 if (VOP_ISLOCKED(vp) == LK_EXCLUSIVE &&
  630                     (curthread->td_pflags2 & TDP2_SBPAGES) == 0)
  631                         setnsize = true;
  632                 else
  633                         np->n_flag |= NVNSETSZSKIP;
  634         }
  635         if (nsizep == NULL) {
  636                 NFSUNLOCKNODE(np);
  637                 if (setnsize)
  638                         vnode_pager_setsize(vp, nsize);
  639                 setnsize = false;
  640         } else {
  641                 *nsizep = nsize;
  642         }
  643         return (setnsize);
  644 }
  645 
  646 /*
  647  * Fill in the client id name. For these bytes:
  648  * 1 - they must be unique
  649  * 2 - they should be persistent across client reboots
  650  * 1 is more critical than 2
  651  * Use the mount point's unique id plus either the uuid or, if that
  652  * isn't set, random junk.
  653  */
  654 void
  655 nfscl_fillclid(u_int64_t clval, char *uuid, u_int8_t *cp, u_int16_t idlen)
  656 {
  657         int uuidlen;
  658 
  659         /*
  660          * First, put in the 64bit mount point identifier.
  661          */
  662         if (idlen >= sizeof (u_int64_t)) {
  663                 NFSBCOPY((caddr_t)&clval, cp, sizeof (u_int64_t));
  664                 cp += sizeof (u_int64_t);
  665                 idlen -= sizeof (u_int64_t);
  666         }
  667 
  668         /*
  669          * If uuid is non-zero length, use it.
  670          */
  671         uuidlen = strlen(uuid);
  672         if (uuidlen > 0 && idlen >= uuidlen) {
  673                 NFSBCOPY(uuid, cp, uuidlen);
  674                 cp += uuidlen;
  675                 idlen -= uuidlen;
  676         }
  677 
  678         /*
  679          * This only normally happens if the uuid isn't set.
  680          */
  681         while (idlen > 0) {
  682                 *cp++ = (u_int8_t)(arc4random() % 256);
  683                 idlen--;
  684         }
  685 }
  686 
  687 /*
  688  * Fill in a lock owner name. For now, pid + the process's creation time.
  689  */
  690 void
  691 nfscl_filllockowner(void *id, u_int8_t *cp, int flags)
  692 {
  693         union {
  694                 u_int32_t       lval;
  695                 u_int8_t        cval[4];
  696         } tl;
  697         struct proc *p;
  698 
  699         if (id == NULL) {
  700                 /* Return the single open_owner of all 0 bytes. */
  701                 bzero(cp, NFSV4CL_LOCKNAMELEN);
  702                 return;
  703         }
  704         if ((flags & F_POSIX) != 0) {
  705                 p = (struct proc *)id;
  706                 tl.lval = p->p_pid;
  707                 *cp++ = tl.cval[0];
  708                 *cp++ = tl.cval[1];
  709                 *cp++ = tl.cval[2];
  710                 *cp++ = tl.cval[3];
  711                 tl.lval = p->p_stats->p_start.tv_sec;
  712                 *cp++ = tl.cval[0];
  713                 *cp++ = tl.cval[1];
  714                 *cp++ = tl.cval[2];
  715                 *cp++ = tl.cval[3];
  716                 tl.lval = p->p_stats->p_start.tv_usec;
  717                 *cp++ = tl.cval[0];
  718                 *cp++ = tl.cval[1];
  719                 *cp++ = tl.cval[2];
  720                 *cp = tl.cval[3];
  721         } else if ((flags & F_FLOCK) != 0) {
  722                 bcopy(&id, cp, sizeof(id));
  723                 bzero(&cp[sizeof(id)], NFSV4CL_LOCKNAMELEN - sizeof(id));
  724         } else {
  725                 printf("nfscl_filllockowner: not F_POSIX or F_FLOCK\n");
  726                 bzero(cp, NFSV4CL_LOCKNAMELEN);
  727         }
  728 }
  729 
  730 /*
  731  * Find the parent process for the thread passed in as an argument.
  732  * If none exists, return NULL, otherwise return a thread for the parent.
  733  * (Can be any of the threads, since it is only used for td->td_proc.)
  734  */
  735 NFSPROC_T *
  736 nfscl_getparent(struct thread *td)
  737 {
  738         struct proc *p;
  739         struct thread *ptd;
  740 
  741         if (td == NULL)
  742                 return (NULL);
  743         p = td->td_proc;
  744         if (p->p_pid == 0)
  745                 return (NULL);
  746         p = p->p_pptr;
  747         if (p == NULL)
  748                 return (NULL);
  749         ptd = TAILQ_FIRST(&p->p_threads);
  750         return (ptd);
  751 }
  752 
  753 /*
  754  * Start up the renew kernel thread.
  755  */
  756 static void
  757 start_nfscl(void *arg)
  758 {
  759         struct nfsclclient *clp;
  760         struct thread *td;
  761 
  762         clp = (struct nfsclclient *)arg;
  763         td = TAILQ_FIRST(&clp->nfsc_renewthread->p_threads);
  764         nfscl_renewthread(clp, td);
  765         kproc_exit(0);
  766 }
  767 
  768 void
  769 nfscl_start_renewthread(struct nfsclclient *clp)
  770 {
  771 
  772         kproc_create(start_nfscl, (void *)clp, &clp->nfsc_renewthread, 0, 0,
  773             "nfscl");
  774 }
  775 
  776 /*
  777  * Handle wcc_data.
  778  * For NFSv4, it assumes that nfsv4_wccattr() was used to set up the getattr
  779  * as the first Op after PutFH.
  780  * (For NFSv4, the postop attributes are after the Op, so they can't be
  781  *  parsed here. A separate call to nfscl_postop_attr() is required.)
  782  */
  783 int
  784 nfscl_wcc_data(struct nfsrv_descript *nd, struct vnode *vp,
  785     struct nfsvattr *nap, int *flagp, int *wccflagp, uint64_t *repsizep)
  786 {
  787         u_int32_t *tl;
  788         struct nfsnode *np = VTONFS(vp);
  789         struct nfsvattr nfsva;
  790         int error = 0;
  791 
  792         if (wccflagp != NULL)
  793                 *wccflagp = 0;
  794         if (nd->nd_flag & ND_NFSV3) {
  795                 *flagp = 0;
  796                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
  797                 if (*tl == newnfs_true) {
  798                         NFSM_DISSECT(tl, u_int32_t *, 6 * NFSX_UNSIGNED);
  799                         if (wccflagp != NULL) {
  800                                 NFSLOCKNODE(np);
  801                                 *wccflagp = (np->n_mtime.tv_sec ==
  802                                     fxdr_unsigned(u_int32_t, *(tl + 2)) &&
  803                                     np->n_mtime.tv_nsec ==
  804                                     fxdr_unsigned(u_int32_t, *(tl + 3)));
  805                                 NFSUNLOCKNODE(np);
  806                         }
  807                 }
  808                 error = nfscl_postop_attr(nd, nap, flagp);
  809                 if (wccflagp != NULL && *flagp == 0)
  810                         *wccflagp = 0;
  811         } else if ((nd->nd_flag & (ND_NOMOREDATA | ND_NFSV4 | ND_V4WCCATTR))
  812             == (ND_NFSV4 | ND_V4WCCATTR)) {
  813                 error = nfsv4_loadattr(nd, NULL, &nfsva, NULL,
  814                     NULL, 0, NULL, NULL, NULL, NULL, NULL, 0,
  815                     NULL, NULL, NULL, NULL, NULL);
  816                 if (error)
  817                         return (error);
  818                 /*
  819                  * Get rid of Op# and status for next op.
  820                  */
  821                 NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
  822                 if (*++tl)
  823                         nd->nd_flag |= ND_NOMOREDATA;
  824                 if (repsizep != NULL)
  825                         *repsizep = nfsva.na_size;
  826                 if (wccflagp != NULL &&
  827                     nfsva.na_vattr.va_mtime.tv_sec != 0) {
  828                         NFSLOCKNODE(np);
  829                         *wccflagp = (np->n_mtime.tv_sec ==
  830                             nfsva.na_vattr.va_mtime.tv_sec &&
  831                             np->n_mtime.tv_nsec ==
  832                             nfsva.na_vattr.va_mtime.tv_sec);
  833                         NFSUNLOCKNODE(np);
  834                 }
  835         }
  836 nfsmout:
  837         return (error);
  838 }
  839 
  840 /*
  841  * Get postop attributes.
  842  */
  843 int
  844 nfscl_postop_attr(struct nfsrv_descript *nd, struct nfsvattr *nap, int *retp)
  845 {
  846         u_int32_t *tl;
  847         int error = 0;
  848 
  849         *retp = 0;
  850         if (nd->nd_flag & ND_NOMOREDATA)
  851                 return (error);
  852         if (nd->nd_flag & ND_NFSV3) {
  853                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
  854                 *retp = fxdr_unsigned(int, *tl);
  855         } else if (nd->nd_flag & ND_NFSV4) {
  856                 /*
  857                  * For NFSv4, the postop attr are at the end, so no point
  858                  * in looking if nd_repstat != 0.
  859                  */
  860                 if (!nd->nd_repstat) {
  861                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
  862                         if (*(tl + 1))
  863                                 /* should never happen since nd_repstat != 0 */
  864                                 nd->nd_flag |= ND_NOMOREDATA;
  865                         else
  866                                 *retp = 1;
  867                 }
  868         } else if (!nd->nd_repstat) {
  869                 /* For NFSv2, the attributes are here iff nd_repstat == 0 */
  870                 *retp = 1;
  871         }
  872         if (*retp) {
  873                 error = nfsm_loadattr(nd, nap);
  874                 if (error)
  875                         *retp = 0;
  876         }
  877 nfsmout:
  878         return (error);
  879 }
  880 
  881 /*
  882  * nfscl_request() - mostly a wrapper for newnfs_request().
  883  */
  884 int
  885 nfscl_request(struct nfsrv_descript *nd, struct vnode *vp, NFSPROC_T *p,
  886     struct ucred *cred)
  887 {
  888         int ret, vers;
  889         struct nfsmount *nmp;
  890 
  891         nmp = VFSTONFS(vp->v_mount);
  892         if (nd->nd_flag & ND_NFSV4)
  893                 vers = NFS_VER4;
  894         else if (nd->nd_flag & ND_NFSV3)
  895                 vers = NFS_VER3;
  896         else
  897                 vers = NFS_VER2;
  898         ret = newnfs_request(nd, nmp, NULL, &nmp->nm_sockreq, vp, p, cred,
  899                 NFS_PROG, vers, NULL, 1, NULL, NULL);
  900         return (ret);
  901 }
  902 
  903 /*
  904  * fill in this bsden's variant of statfs using nfsstatfs.
  905  */
  906 void
  907 nfscl_loadsbinfo(struct nfsmount *nmp, struct nfsstatfs *sfp, void *statfs)
  908 {
  909         struct statfs *sbp = (struct statfs *)statfs;
  910 
  911         if (nmp->nm_flag & (NFSMNT_NFSV3 | NFSMNT_NFSV4)) {
  912                 sbp->f_bsize = NFS_FABLKSIZE;
  913                 sbp->f_blocks = sfp->sf_tbytes / NFS_FABLKSIZE;
  914                 sbp->f_bfree = sfp->sf_fbytes / NFS_FABLKSIZE;
  915                 /*
  916                  * Although sf_abytes is uint64_t and f_bavail is int64_t,
  917                  * the value after dividing by NFS_FABLKSIZE is small
  918                  * enough that it will fit in 63bits, so it is ok to
  919                  * assign it to f_bavail without fear that it will become
  920                  * negative.
  921                  */
  922                 sbp->f_bavail = sfp->sf_abytes / NFS_FABLKSIZE;
  923                 sbp->f_files = sfp->sf_tfiles;
  924                 /* Since f_ffree is int64_t, clip it to 63bits. */
  925                 if (sfp->sf_ffiles > INT64_MAX)
  926                         sbp->f_ffree = INT64_MAX;
  927                 else
  928                         sbp->f_ffree = sfp->sf_ffiles;
  929         } else if ((nmp->nm_flag & NFSMNT_NFSV4) == 0) {
  930                 /*
  931                  * The type casts to (int32_t) ensure that this code is
  932                  * compatible with the old NFS client, in that it will
  933                  * propagate bit31 to the high order bits. This may or may
  934                  * not be correct for NFSv2, but since it is a legacy
  935                  * environment, I'd rather retain backwards compatibility.
  936                  */
  937                 sbp->f_bsize = (int32_t)sfp->sf_bsize;
  938                 sbp->f_blocks = (int32_t)sfp->sf_blocks;
  939                 sbp->f_bfree = (int32_t)sfp->sf_bfree;
  940                 sbp->f_bavail = (int32_t)sfp->sf_bavail;
  941                 sbp->f_files = 0;
  942                 sbp->f_ffree = 0;
  943         }
  944 }
  945 
  946 /*
  947  * Use the fsinfo stuff to update the mount point.
  948  */
  949 void
  950 nfscl_loadfsinfo(struct nfsmount *nmp, struct nfsfsinfo *fsp)
  951 {
  952 
  953         if ((nmp->nm_wsize == 0 || fsp->fs_wtpref < nmp->nm_wsize) &&
  954             fsp->fs_wtpref >= NFS_FABLKSIZE)
  955                 nmp->nm_wsize = (fsp->fs_wtpref + NFS_FABLKSIZE - 1) &
  956                     ~(NFS_FABLKSIZE - 1);
  957         if (fsp->fs_wtmax < nmp->nm_wsize && fsp->fs_wtmax > 0) {
  958                 nmp->nm_wsize = fsp->fs_wtmax & ~(NFS_FABLKSIZE - 1);
  959                 if (nmp->nm_wsize == 0)
  960                         nmp->nm_wsize = fsp->fs_wtmax;
  961         }
  962         if (nmp->nm_wsize < NFS_FABLKSIZE)
  963                 nmp->nm_wsize = NFS_FABLKSIZE;
  964         if ((nmp->nm_rsize == 0 || fsp->fs_rtpref < nmp->nm_rsize) &&
  965             fsp->fs_rtpref >= NFS_FABLKSIZE)
  966                 nmp->nm_rsize = (fsp->fs_rtpref + NFS_FABLKSIZE - 1) &
  967                     ~(NFS_FABLKSIZE - 1);
  968         if (fsp->fs_rtmax < nmp->nm_rsize && fsp->fs_rtmax > 0) {
  969                 nmp->nm_rsize = fsp->fs_rtmax & ~(NFS_FABLKSIZE - 1);
  970                 if (nmp->nm_rsize == 0)
  971                         nmp->nm_rsize = fsp->fs_rtmax;
  972         }
  973         if (nmp->nm_rsize < NFS_FABLKSIZE)
  974                 nmp->nm_rsize = NFS_FABLKSIZE;
  975         if ((nmp->nm_readdirsize == 0 || fsp->fs_dtpref < nmp->nm_readdirsize)
  976             && fsp->fs_dtpref >= NFS_DIRBLKSIZ)
  977                 nmp->nm_readdirsize = (fsp->fs_dtpref + NFS_DIRBLKSIZ - 1) &
  978                     ~(NFS_DIRBLKSIZ - 1);
  979         if (fsp->fs_rtmax < nmp->nm_readdirsize && fsp->fs_rtmax > 0) {
  980                 nmp->nm_readdirsize = fsp->fs_rtmax & ~(NFS_DIRBLKSIZ - 1);
  981                 if (nmp->nm_readdirsize == 0)
  982                         nmp->nm_readdirsize = fsp->fs_rtmax;
  983         }
  984         if (nmp->nm_readdirsize < NFS_DIRBLKSIZ)
  985                 nmp->nm_readdirsize = NFS_DIRBLKSIZ;
  986         if (fsp->fs_maxfilesize > 0 &&
  987             fsp->fs_maxfilesize < nmp->nm_maxfilesize)
  988                 nmp->nm_maxfilesize = fsp->fs_maxfilesize;
  989         nmp->nm_mountp->mnt_stat.f_iosize = newnfs_iosize(nmp);
  990         nmp->nm_state |= NFSSTA_GOTFSINFO;
  991 }
  992 
  993 /*
  994  * Lookups source address which should be used to communicate with
  995  * @nmp and stores it inside @pdst.
  996  *
  997  * Returns 0 on success.
  998  */
  999 u_int8_t *
 1000 nfscl_getmyip(struct nfsmount *nmp, struct in6_addr *paddr, int *isinet6p)
 1001 {
 1002 #if defined(INET6) || defined(INET)
 1003         int fibnum;
 1004 
 1005         fibnum = curthread->td_proc->p_fibnum;
 1006 #endif
 1007 #ifdef INET
 1008         if (nmp->nm_nam->sa_family == AF_INET) {
 1009                 struct epoch_tracker et;
 1010                 struct nhop_object *nh;
 1011                 struct sockaddr_in *sin;
 1012                 struct in_addr addr = {};
 1013 
 1014                 sin = (struct sockaddr_in *)nmp->nm_nam;
 1015                 NET_EPOCH_ENTER(et);
 1016                 CURVNET_SET(CRED_TO_VNET(nmp->nm_sockreq.nr_cred));
 1017                 nh = fib4_lookup(fibnum, sin->sin_addr, 0, NHR_NONE, 0);
 1018                 if (nh != NULL) {
 1019                         addr = IA_SIN(ifatoia(nh->nh_ifa))->sin_addr;
 1020                         if (IN_LOOPBACK(ntohl(addr.s_addr))) {
 1021                                 /* Ignore loopback addresses */
 1022                                 nh = NULL;
 1023                         }
 1024                 }
 1025                 CURVNET_RESTORE();
 1026                 NET_EPOCH_EXIT(et);
 1027 
 1028                 if (nh == NULL)
 1029                         return (NULL);
 1030                 *isinet6p = 0;
 1031                 *((struct in_addr *)paddr) = addr;
 1032 
 1033                 return (u_int8_t *)paddr;
 1034         }
 1035 #endif
 1036 #ifdef INET6
 1037         if (nmp->nm_nam->sa_family == AF_INET6) {
 1038                 struct epoch_tracker et;
 1039                 struct sockaddr_in6 *sin6;
 1040                 int error;
 1041 
 1042                 sin6 = (struct sockaddr_in6 *)nmp->nm_nam;
 1043 
 1044                 NET_EPOCH_ENTER(et);
 1045                 CURVNET_SET(CRED_TO_VNET(nmp->nm_sockreq.nr_cred));
 1046                 error = in6_selectsrc_addr(fibnum, &sin6->sin6_addr,
 1047                     sin6->sin6_scope_id, NULL, paddr, NULL);
 1048                 CURVNET_RESTORE();
 1049                 NET_EPOCH_EXIT(et);
 1050                 if (error != 0)
 1051                         return (NULL);
 1052 
 1053                 if (IN6_IS_ADDR_LOOPBACK(paddr))
 1054                         return (NULL);
 1055 
 1056                 /* Scope is embedded in */
 1057                 *isinet6p = 1;
 1058 
 1059                 return (u_int8_t *)paddr;
 1060         }
 1061 #endif
 1062         return (NULL);
 1063 }
 1064 
 1065 /*
 1066  * Copy NFS uid, gids from the cred structure.
 1067  */
 1068 void
 1069 newnfs_copyincred(struct ucred *cr, struct nfscred *nfscr)
 1070 {
 1071         int i;
 1072 
 1073         KASSERT(cr->cr_ngroups >= 0,
 1074             ("newnfs_copyincred: negative cr_ngroups"));
 1075         nfscr->nfsc_uid = cr->cr_uid;
 1076         nfscr->nfsc_ngroups = MIN(cr->cr_ngroups, NFS_MAXGRPS + 1);
 1077         for (i = 0; i < nfscr->nfsc_ngroups; i++)
 1078                 nfscr->nfsc_groups[i] = cr->cr_groups[i];
 1079 }
 1080 
 1081 /*
 1082  * Do any client specific initialization.
 1083  */
 1084 void
 1085 nfscl_init(void)
 1086 {
 1087         static int inited = 0;
 1088 
 1089         if (inited)
 1090                 return;
 1091         inited = 1;
 1092         nfscl_inited = 1;
 1093         ncl_pbuf_zone = pbuf_zsecond_create("nfspbuf", nswbuf / 2);
 1094 }
 1095 
 1096 /*
 1097  * Check each of the attributes to be set, to ensure they aren't already
 1098  * the correct value. Disable setting ones already correct.
 1099  */
 1100 int
 1101 nfscl_checksattr(struct vattr *vap, struct nfsvattr *nvap)
 1102 {
 1103 
 1104         if (vap->va_mode != (mode_t)VNOVAL) {
 1105                 if (vap->va_mode == nvap->na_mode)
 1106                         vap->va_mode = (mode_t)VNOVAL;
 1107         }
 1108         if (vap->va_uid != (uid_t)VNOVAL) {
 1109                 if (vap->va_uid == nvap->na_uid)
 1110                         vap->va_uid = (uid_t)VNOVAL;
 1111         }
 1112         if (vap->va_gid != (gid_t)VNOVAL) {
 1113                 if (vap->va_gid == nvap->na_gid)
 1114                         vap->va_gid = (gid_t)VNOVAL;
 1115         }
 1116         if (vap->va_size != VNOVAL) {
 1117                 if (vap->va_size == nvap->na_size)
 1118                         vap->va_size = VNOVAL;
 1119         }
 1120 
 1121         /*
 1122          * We are normally called with only a partially initialized
 1123          * VAP.  Since the NFSv3 spec says that server may use the
 1124          * file attributes to store the verifier, the spec requires
 1125          * us to do a SETATTR RPC. FreeBSD servers store the verifier
 1126          * in atime, but we can't really assume that all servers will
 1127          * so we ensure that our SETATTR sets both atime and mtime.
 1128          * Set the VA_UTIMES_NULL flag for this case, so that
 1129          * the server's time will be used.  This is needed to
 1130          * work around a bug in some Solaris servers, where
 1131          * setting the time TOCLIENT causes the Setattr RPC
 1132          * to return NFS_OK, but not set va_mode.
 1133          */
 1134         if (vap->va_mtime.tv_sec == VNOVAL) {
 1135                 vfs_timestamp(&vap->va_mtime);
 1136                 vap->va_vaflags |= VA_UTIMES_NULL;
 1137         }
 1138         if (vap->va_atime.tv_sec == VNOVAL)
 1139                 vap->va_atime = vap->va_mtime;
 1140         return (1);
 1141 }
 1142 
 1143 /*
 1144  * Map nfsv4 errors to errno.h errors.
 1145  * The uid and gid arguments are only used for NFSERR_BADOWNER and that
 1146  * error should only be returned for the Open, Create and Setattr Ops.
 1147  * As such, most calls can just pass in 0 for those arguments.
 1148  */
 1149 int
 1150 nfscl_maperr(struct thread *td, int error, uid_t uid, gid_t gid)
 1151 {
 1152         struct proc *p;
 1153 
 1154         if (error < 10000 || error >= NFSERR_STALEWRITEVERF)
 1155                 return (error);
 1156         if (td != NULL)
 1157                 p = td->td_proc;
 1158         else
 1159                 p = NULL;
 1160         switch (error) {
 1161         case NFSERR_BADOWNER:
 1162                 tprintf(p, LOG_INFO,
 1163                     "No name and/or group mapping for uid,gid:(%d,%d)\n",
 1164                     uid, gid);
 1165                 return (EPERM);
 1166         case NFSERR_BADNAME:
 1167         case NFSERR_BADCHAR:
 1168                 printf("nfsv4 char/name not handled by server\n");
 1169                 return (ENOENT);
 1170         case NFSERR_STALECLIENTID:
 1171         case NFSERR_STALESTATEID:
 1172         case NFSERR_EXPIRED:
 1173         case NFSERR_BADSTATEID:
 1174         case NFSERR_BADSESSION:
 1175                 printf("nfsv4 recover err returned %d\n", error);
 1176                 return (EIO);
 1177         case NFSERR_BADHANDLE:
 1178         case NFSERR_SERVERFAULT:
 1179         case NFSERR_BADTYPE:
 1180         case NFSERR_FHEXPIRED:
 1181         case NFSERR_RESOURCE:
 1182         case NFSERR_MOVED:
 1183         case NFSERR_MINORVERMISMATCH:
 1184         case NFSERR_OLDSTATEID:
 1185         case NFSERR_BADSEQID:
 1186         case NFSERR_LEASEMOVED:
 1187         case NFSERR_RECLAIMBAD:
 1188         case NFSERR_BADXDR:
 1189         case NFSERR_OPILLEGAL:
 1190                 printf("nfsv4 client/server protocol prob err=%d\n",
 1191                     error);
 1192                 return (EIO);
 1193         case NFSERR_NOFILEHANDLE:
 1194                 printf("nfsv4 no file handle: usually means the file "
 1195                     "system is not exported on the NFSv4 server\n");
 1196                 return (EIO);
 1197         case NFSERR_WRONGSEC:
 1198                 tprintf(p, LOG_INFO, "NFSv4 error WrongSec: You probably need a"
 1199                     " Kerberos TGT\n");
 1200                 return (EIO);
 1201         default:
 1202                 tprintf(p, LOG_INFO, "nfsv4 err=%d\n", error);
 1203                 return (EIO);
 1204         };
 1205 }
 1206 
 1207 /*
 1208  * Check to see if the process for this owner exists. Return 1 if it doesn't
 1209  * and 0 otherwise.
 1210  */
 1211 int
 1212 nfscl_procdoesntexist(u_int8_t *own)
 1213 {
 1214         union {
 1215                 u_int32_t       lval;
 1216                 u_int8_t        cval[4];
 1217         } tl;
 1218         struct proc *p;
 1219         pid_t pid;
 1220         int i, ret = 0;
 1221 
 1222         /* For the single open_owner of all 0 bytes, just return 0. */
 1223         for (i = 0; i < NFSV4CL_LOCKNAMELEN; i++)
 1224                 if (own[i] != 0)
 1225                         break;
 1226         if (i == NFSV4CL_LOCKNAMELEN)
 1227                 return (0);
 1228 
 1229         tl.cval[0] = *own++;
 1230         tl.cval[1] = *own++;
 1231         tl.cval[2] = *own++;
 1232         tl.cval[3] = *own++;
 1233         pid = tl.lval;
 1234         p = pfind_any_locked(pid);
 1235         if (p == NULL)
 1236                 return (1);
 1237         if (p->p_stats == NULL) {
 1238                 PROC_UNLOCK(p);
 1239                 return (0);
 1240         }
 1241         tl.cval[0] = *own++;
 1242         tl.cval[1] = *own++;
 1243         tl.cval[2] = *own++;
 1244         tl.cval[3] = *own++;
 1245         if (tl.lval != p->p_stats->p_start.tv_sec) {
 1246                 ret = 1;
 1247         } else {
 1248                 tl.cval[0] = *own++;
 1249                 tl.cval[1] = *own++;
 1250                 tl.cval[2] = *own++;
 1251                 tl.cval[3] = *own;
 1252                 if (tl.lval != p->p_stats->p_start.tv_usec)
 1253                         ret = 1;
 1254         }
 1255         PROC_UNLOCK(p);
 1256         return (ret);
 1257 }
 1258 
 1259 /*
 1260  * - nfs pseudo system call for the client
 1261  */
 1262 /*
 1263  * MPSAFE
 1264  */
 1265 static int
 1266 nfssvc_nfscl(struct thread *td, struct nfssvc_args *uap)
 1267 {
 1268         struct file *fp;
 1269         struct nfscbd_args nfscbdarg;
 1270         struct nfsd_nfscbd_args nfscbdarg2;
 1271         struct nameidata nd;
 1272         struct nfscl_dumpmntopts dumpmntopts;
 1273         cap_rights_t rights;
 1274         char *buf;
 1275         int error;
 1276         struct mount *mp;
 1277         struct nfsmount *nmp;
 1278 
 1279         if (uap->flag & NFSSVC_CBADDSOCK) {
 1280                 error = copyin(uap->argp, (caddr_t)&nfscbdarg, sizeof(nfscbdarg));
 1281                 if (error)
 1282                         return (error);
 1283                 /*
 1284                  * Since we don't know what rights might be required,
 1285                  * pretend that we need them all. It is better to be too
 1286                  * careful than too reckless.
 1287                  */
 1288                 error = fget(td, nfscbdarg.sock,
 1289                     cap_rights_init_one(&rights, CAP_SOCK_CLIENT), &fp);
 1290                 if (error)
 1291                         return (error);
 1292                 if (fp->f_type != DTYPE_SOCKET) {
 1293                         fdrop(fp, td);
 1294                         return (EPERM);
 1295                 }
 1296                 error = nfscbd_addsock(fp);
 1297                 fdrop(fp, td);
 1298                 if (!error && nfscl_enablecallb == 0) {
 1299                         nfsv4_cbport = nfscbdarg.port;
 1300                         nfscl_enablecallb = 1;
 1301                 }
 1302         } else if (uap->flag & NFSSVC_NFSCBD) {
 1303                 if (uap->argp == NULL) 
 1304                         return (EINVAL);
 1305                 error = copyin(uap->argp, (caddr_t)&nfscbdarg2,
 1306                     sizeof(nfscbdarg2));
 1307                 if (error)
 1308                         return (error);
 1309                 error = nfscbd_nfsd(td, &nfscbdarg2);
 1310         } else if (uap->flag & NFSSVC_DUMPMNTOPTS) {
 1311                 error = copyin(uap->argp, &dumpmntopts, sizeof(dumpmntopts));
 1312                 if (error == 0 && (dumpmntopts.ndmnt_blen < 256 ||
 1313                     dumpmntopts.ndmnt_blen > 1024))
 1314                         error = EINVAL;
 1315                 if (error == 0)
 1316                         error = nfsrv_lookupfilename(&nd,
 1317                             dumpmntopts.ndmnt_fname, td);
 1318                 if (error == 0 && strcmp(nd.ni_vp->v_mount->mnt_vfc->vfc_name,
 1319                     "nfs") != 0) {
 1320                         vput(nd.ni_vp);
 1321                         error = EINVAL;
 1322                 }
 1323                 if (error == 0) {
 1324                         buf = malloc(dumpmntopts.ndmnt_blen, M_TEMP, M_WAITOK |
 1325                             M_ZERO);
 1326                         nfscl_retopts(VFSTONFS(nd.ni_vp->v_mount), buf,
 1327                             dumpmntopts.ndmnt_blen);
 1328                         vput(nd.ni_vp);
 1329                         error = copyout(buf, dumpmntopts.ndmnt_buf,
 1330                             dumpmntopts.ndmnt_blen);
 1331                         free(buf, M_TEMP);
 1332                 }
 1333         } else if (uap->flag & NFSSVC_FORCEDISM) {
 1334                 buf = malloc(MNAMELEN + 1, M_TEMP, M_WAITOK);
 1335                 error = copyinstr(uap->argp, buf, MNAMELEN + 1, NULL);
 1336                 if (error == 0) {
 1337                         nmp = NULL;
 1338                         mtx_lock(&mountlist_mtx);
 1339                         TAILQ_FOREACH(mp, &mountlist, mnt_list) {
 1340                                 if (strcmp(mp->mnt_stat.f_mntonname, buf) ==
 1341                                     0 && strcmp(mp->mnt_stat.f_fstypename,
 1342                                     "nfs") == 0 && mp->mnt_data != NULL) {
 1343                                         nmp = VFSTONFS(mp);
 1344                                         NFSDDSLOCK();
 1345                                         if (nfsv4_findmirror(nmp) != NULL) {
 1346                                                 NFSDDSUNLOCK();
 1347                                                 error = ENXIO;
 1348                                                 nmp = NULL;
 1349                                                 break;
 1350                                         }
 1351                                         mtx_lock(&nmp->nm_mtx);
 1352                                         if ((nmp->nm_privflag &
 1353                                             NFSMNTP_FORCEDISM) == 0) {
 1354                                                 nmp->nm_privflag |= 
 1355                                                    (NFSMNTP_FORCEDISM |
 1356                                                     NFSMNTP_CANCELRPCS);
 1357                                                 mtx_unlock(&nmp->nm_mtx);
 1358                                         } else {
 1359                                                 mtx_unlock(&nmp->nm_mtx);
 1360                                                 nmp = NULL;
 1361                                         }
 1362                                         NFSDDSUNLOCK();
 1363                                         break;
 1364                                 }
 1365                         }
 1366                         mtx_unlock(&mountlist_mtx);
 1367 
 1368                         if (nmp != NULL) {
 1369                                 /*
 1370                                  * Call newnfs_nmcancelreqs() to cause
 1371                                  * any RPCs in progress on the mount point to
 1372                                  * fail.
 1373                                  * This will cause any process waiting for an
 1374                                  * RPC to complete while holding a vnode lock
 1375                                  * on the mounted-on vnode (such as "df" or
 1376                                  * a non-forced "umount") to fail.
 1377                                  * This will unlock the mounted-on vnode so
 1378                                  * a forced dismount can succeed.
 1379                                  * Then clear NFSMNTP_CANCELRPCS and wakeup(),
 1380                                  * so that nfs_unmount() can complete.
 1381                                  */
 1382                                 newnfs_nmcancelreqs(nmp);
 1383                                 mtx_lock(&nmp->nm_mtx);
 1384                                 nmp->nm_privflag &= ~NFSMNTP_CANCELRPCS;
 1385                                 wakeup(nmp);
 1386                                 mtx_unlock(&nmp->nm_mtx);
 1387                         } else if (error == 0)
 1388                                 error = EINVAL;
 1389                 }
 1390                 free(buf, M_TEMP);
 1391         } else {
 1392                 error = EINVAL;
 1393         }
 1394         return (error);
 1395 }
 1396 
 1397 extern int (*nfsd_call_nfscl)(struct thread *, struct nfssvc_args *);
 1398 
 1399 /*
 1400  * Called once to initialize data structures...
 1401  */
 1402 static int
 1403 nfscl_modevent(module_t mod, int type, void *data)
 1404 {
 1405         int error = 0;
 1406         static int loaded = 0;
 1407 
 1408         switch (type) {
 1409         case MOD_LOAD:
 1410                 if (loaded)
 1411                         return (0);
 1412                 newnfs_portinit();
 1413                 mtx_init(&ncl_iod_mutex, "ncl_iod_mutex", NULL, MTX_DEF);
 1414                 nfscl_init();
 1415                 NFSD_LOCK();
 1416                 nfsrvd_cbinit(0);
 1417                 NFSD_UNLOCK();
 1418                 ncl_call_invalcaches = ncl_invalcaches;
 1419                 nfsd_call_nfscl = nfssvc_nfscl;
 1420                 loaded = 1;
 1421                 break;
 1422 
 1423         case MOD_UNLOAD:
 1424                 if (nfs_numnfscbd != 0) {
 1425                         error = EBUSY;
 1426                         break;
 1427                 }
 1428 
 1429                 /*
 1430                  * XXX: Unloading of nfscl module is unsupported.
 1431                  */
 1432 #if 0
 1433                 ncl_call_invalcaches = NULL;
 1434                 nfsd_call_nfscl = NULL;
 1435                 uma_zdestroy(ncl_pbuf_zone);
 1436                 /* and get rid of the mutexes */
 1437                 mtx_destroy(&ncl_iod_mutex);
 1438                 loaded = 0;
 1439                 break;
 1440 #else
 1441                 /* FALLTHROUGH */
 1442 #endif
 1443         default:
 1444                 error = EOPNOTSUPP;
 1445                 break;
 1446         }
 1447         return error;
 1448 }
 1449 static moduledata_t nfscl_mod = {
 1450         "nfscl",
 1451         nfscl_modevent,
 1452         NULL,
 1453 };
 1454 /*
 1455  * This is the main module declaration for the NFS client.  The
 1456  * nfscl_modevent() function is needed to ensure that the module
 1457  * cannot be unloaded, among other things.
 1458  * There is also a module declaration in sys/fs/nfsclient/nfs_clvfsops.c
 1459  * for the name "nfs" within the VFS_SET() macro that defines the "nfs"
 1460  * file system type.
 1461  */
 1462 DECLARE_MODULE(nfscl, nfscl_mod, SI_SUB_VFS, SI_ORDER_FIRST);
 1463 
 1464 /* So that loader and kldload(2) can find us, wherever we are.. */
 1465 MODULE_VERSION(nfscl, 1);
 1466 MODULE_DEPEND(nfscl, nfscommon, 1, 1, 1);
 1467 MODULE_DEPEND(nfscl, krpc, 1, 1, 1);
 1468 MODULE_DEPEND(nfscl, nfssvc, 1, 1, 1);
 1469 MODULE_DEPEND(nfscl, xdr, 1, 1, 1);

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