sys/fs/nfsserver/nfs_nfsdstate.c

   1 /*-
   2  * Copyright (c) 2009 Rick Macklem, University of Guelph
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  */
  27
  28 #include <sys/cdefs.h>
  29 __FBSDID("$FreeBSD$");
  30
  31 #ifndef APPLEKEXT
  32 #include <fs/nfs/nfsport.h>
  33
  34 struct nfsrv_stablefirst nfsrv_stablefirst;
  35 int nfsrv_issuedelegs = 0;
  36 int nfsrv_dolocallocks = 0;
  37 struct nfsv4lock nfsv4rootfs_lock;
  38
  39 extern int newnfs_numnfsd;
  40 extern struct nfsstatsv1 nfsstatsv1;
  41 extern int nfsrv_lease;
  42 extern struct timeval nfsboottime;
  43 extern u_int32_t newnfs_true, newnfs_false;
  44 NFSV4ROOTLOCKMUTEX;
  45 NFSSTATESPINLOCK;
  46
  47 SYSCTL_DECL(_vfs_nfsd);
  48 int     nfsrv_statehashsize = NFSSTATEHASHSIZE;
  49 SYSCTL_INT(_vfs_nfsd, OID_AUTO, statehashsize, CTLFLAG_RDTUN,
  50     &nfsrv_statehashsize, 0,
  51     "Size of state hash table set via loader.conf");
  52
  53 int     nfsrv_clienthashsize = NFSCLIENTHASHSIZE;
  54 SYSCTL_INT(_vfs_nfsd, OID_AUTO, clienthashsize, CTLFLAG_RDTUN,
  55     &nfsrv_clienthashsize, 0,
  56     "Size of client hash table set via loader.conf");
  57
  58 int     nfsrv_lockhashsize = NFSLOCKHASHSIZE;
  59 SYSCTL_INT(_vfs_nfsd, OID_AUTO, fhhashsize, CTLFLAG_RDTUN,
  60     &nfsrv_lockhashsize, 0,
  61     "Size of file handle hash table set via loader.conf");
  62
  63 int     nfsrv_sessionhashsize = NFSSESSIONHASHSIZE;
  64 SYSCTL_INT(_vfs_nfsd, OID_AUTO, sessionhashsize, CTLFLAG_RDTUN,
  65     &nfsrv_sessionhashsize, 0,
  66     "Size of session hash table set via loader.conf");
  67
  68 static int      nfsrv_v4statelimit = NFSRV_V4STATELIMIT;
  69 SYSCTL_INT(_vfs_nfsd, OID_AUTO, v4statelimit, CTLFLAG_RWTUN,
  70     &nfsrv_v4statelimit, 0,
  71     "High water limit for NFSv4 opens+locks+delegations");
  72
  73 static int      nfsrv_writedelegifpos = 0;
  74 SYSCTL_INT(_vfs_nfsd, OID_AUTO, writedelegifpos, CTLFLAG_RW,
  75     &nfsrv_writedelegifpos, 0,
  76     "Issue a write delegation for read opens if possible");
  77
  78 /*
  79  * Hash lists for nfs V4.
  80  */
  81 struct nfsclienthashhead        *nfsclienthash;
  82 struct nfslockhashhead          *nfslockhash;
  83 struct nfssessionhash           *nfssessionhash;
  84 #endif  /* !APPLEKEXT */
  85
  86 static u_int32_t nfsrv_openpluslock = 0, nfsrv_delegatecnt = 0;
  87 static time_t nfsrvboottime;
  88 static int nfsrv_returnoldstateid = 0, nfsrv_clients = 0;
  89 static int nfsrv_clienthighwater = NFSRV_CLIENTHIGHWATER;
  90 static int nfsrv_nogsscallback = 0;
  91
  92 /* local functions */
  93 static void nfsrv_dumpaclient(struct nfsclient *clp,
  94     struct nfsd_dumpclients *dumpp);
  95 static void nfsrv_freeopenowner(struct nfsstate *stp, int cansleep,
  96     NFSPROC_T *p);
  97 static int nfsrv_freeopen(struct nfsstate *stp, vnode_t vp, int cansleep,
  98     NFSPROC_T *p);
  99 static void nfsrv_freelockowner(struct nfsstate *stp, vnode_t vp, int cansleep,
 100     NFSPROC_T *p);
 101 static void nfsrv_freeallnfslocks(struct nfsstate *stp, vnode_t vp,
 102     int cansleep, NFSPROC_T *p);
 103 static void nfsrv_freenfslock(struct nfslock *lop);
 104 static void nfsrv_freenfslockfile(struct nfslockfile *lfp);
 105 static void nfsrv_freedeleg(struct nfsstate *);
 106 static int nfsrv_getstate(struct nfsclient *clp, nfsv4stateid_t *stateidp,
 107     u_int32_t flags, struct nfsstate **stpp);
 108 static void nfsrv_getowner(struct nfsstatehead *hp, struct nfsstate *new_stp,
 109     struct nfsstate **stpp);
 110 static int nfsrv_getlockfh(vnode_t vp, u_short flags,
 111     struct nfslockfile *new_lfp, fhandle_t *nfhp, NFSPROC_T *p);
 112 static int nfsrv_getlockfile(u_short flags, struct nfslockfile **new_lfpp,
 113     struct nfslockfile **lfpp, fhandle_t *nfhp, int lockit);
 114 static void nfsrv_insertlock(struct nfslock *new_lop,
 115     struct nfslock *insert_lop, struct nfsstate *stp, struct nfslockfile *lfp);
 116 static void nfsrv_updatelock(struct nfsstate *stp, struct nfslock **new_lopp,
 117     struct nfslock **other_lopp, struct nfslockfile *lfp);
 118 static int nfsrv_getipnumber(u_char *cp);
 119 static int nfsrv_checkrestart(nfsquad_t clientid, u_int32_t flags,
 120     nfsv4stateid_t *stateidp, int specialid);
 121 static int nfsrv_checkgrace(struct nfsrv_descript *nd, struct nfsclient *clp,
 122     u_int32_t flags);
 123 static int nfsrv_docallback(struct nfsclient *clp, int procnum,
 124     nfsv4stateid_t *stateidp, int trunc, fhandle_t *fhp,
 125     struct nfsvattr *nap, nfsattrbit_t *attrbitp, NFSPROC_T *p);
 126 static int nfsrv_cbcallargs(struct nfsrv_descript *nd, struct nfsclient *clp,
 127     uint32_t callback, int op, const char *optag, struct nfsdsession **sepp);
 128 static u_int32_t nfsrv_nextclientindex(void);
 129 static u_int32_t nfsrv_nextstateindex(struct nfsclient *clp);
 130 static void nfsrv_markstable(struct nfsclient *clp);
 131 static int nfsrv_checkstable(struct nfsclient *clp);
 132 static int nfsrv_clientconflict(struct nfsclient *clp, int *haslockp, struct
 133     vnode *vp, NFSPROC_T *p);
 134 static int nfsrv_delegconflict(struct nfsstate *stp, int *haslockp,
 135     NFSPROC_T *p, vnode_t vp);
 136 static int nfsrv_cleandeleg(vnode_t vp, struct nfslockfile *lfp,
 137     struct nfsclient *clp, int *haslockp, NFSPROC_T *p);
 138 static int nfsrv_notsamecredname(struct nfsrv_descript *nd,
 139     struct nfsclient *clp);
 140 static time_t nfsrv_leaseexpiry(void);
 141 static void nfsrv_delaydelegtimeout(struct nfsstate *stp);
 142 static int nfsrv_checkseqid(struct nfsrv_descript *nd, u_int32_t seqid,
 143     struct nfsstate *stp, struct nfsrvcache *op);
 144 static int nfsrv_nootherstate(struct nfsstate *stp);
 145 static int nfsrv_locallock(vnode_t vp, struct nfslockfile *lfp, int flags,
 146     uint64_t first, uint64_t end, struct nfslockconflict *cfp, NFSPROC_T *p);
 147 static void nfsrv_localunlock(vnode_t vp, struct nfslockfile *lfp,
 148     uint64_t init_first, uint64_t init_end, NFSPROC_T *p);
 149 static int nfsrv_dolocal(vnode_t vp, struct nfslockfile *lfp, int flags,
 150     int oldflags, uint64_t first, uint64_t end, struct nfslockconflict *cfp,
 151     NFSPROC_T *p);
 152 static void nfsrv_locallock_rollback(vnode_t vp, struct nfslockfile *lfp,
 153     NFSPROC_T *p);
 154 static void nfsrv_locallock_commit(struct nfslockfile *lfp, int flags,
 155     uint64_t first, uint64_t end);
 156 static void nfsrv_locklf(struct nfslockfile *lfp);
 157 static void nfsrv_unlocklf(struct nfslockfile *lfp);
 158 static struct nfsdsession *nfsrv_findsession(uint8_t *sessionid);
 159 static int nfsrv_freesession(struct nfsdsession *sep, uint8_t *sessionid);
 160 static int nfsv4_setcbsequence(struct nfsrv_descript *nd, struct nfsclient *clp,
 161     int dont_replycache, struct nfsdsession **sepp);
 162 static int nfsv4_getcbsession(struct nfsclient *clp, struct nfsdsession **sepp);
 163
 164 /*
 165  * Scan the client list for a match and either return the current one,
 166  * create a new entry or return an error.
 167  * If returning a non-error, the clp structure must either be linked into
 168  * the client list or free'd.
 169  */
 170 APPLESTATIC int
 171 nfsrv_setclient(struct nfsrv_descript *nd, struct nfsclient **new_clpp,
 172     nfsquad_t *clientidp, nfsquad_t *confirmp, NFSPROC_T *p)
 173 {
 174         struct nfsclient *clp = NULL, *new_clp = *new_clpp;
 175         int i, error = 0;
 176         struct nfsstate *stp, *tstp;
 177         struct sockaddr_in *sad, *rad;
 178         int zapit = 0, gotit, hasstate = 0, igotlock;
 179         static u_int64_t confirm_index = 0;
 180
 181         /*
 182          * Check for state resource limit exceeded.
 183          */
 184         if (nfsrv_openpluslock > nfsrv_v4statelimit) {
 185                 error = NFSERR_RESOURCE;
 186                 goto out;
 187         }
 188
 189         if (nfsrv_issuedelegs == 0 ||
 190             ((nd->nd_flag & ND_GSS) != 0 && nfsrv_nogsscallback != 0))
 191                 /*
 192                  * Don't do callbacks when delegations are disabled or
 193                  * for AUTH_GSS unless enabled via nfsrv_nogsscallback.
 194                  * If establishing a callback connection is attempted
 195                  * when a firewall is blocking the callback path, the
 196                  * server may wait too long for the connect attempt to
 197                  * succeed during the Open. Some clients, such as Linux,
 198                  * may timeout and give up on the Open before the server
 199                  * replies. Also, since AUTH_GSS callbacks are not
 200                  * yet interoperability tested, they might cause the
 201                  * server to crap out, if they get past the Init call to
 202                  * the client.
 203                  */
 204                 new_clp->lc_program = 0;
 205
 206         /* Lock out other nfsd threads */
 207         NFSLOCKV4ROOTMUTEX();
 208         nfsv4_relref(&nfsv4rootfs_lock);
 209         do {
 210                 igotlock = nfsv4_lock(&nfsv4rootfs_lock, 1, NULL,
 211                     NFSV4ROOTLOCKMUTEXPTR, NULL);
 212         } while (!igotlock);
 213         NFSUNLOCKV4ROOTMUTEX();
 214
 215         /*
 216          * Search for a match in the client list.
 217          */
 218         gotit = i = 0;
 219         while (i < nfsrv_clienthashsize && !gotit) {
 220             LIST_FOREACH(clp, &nfsclienthash[i], lc_hash) {
 221                 if (new_clp->lc_idlen == clp->lc_idlen &&
 222                     !NFSBCMP(new_clp->lc_id, clp->lc_id, clp->lc_idlen)) {
 223                         gotit = 1;
 224                         break;
 225                 }
 226             }
 227             if (gotit == 0)
 228                 i++;
 229         }
 230         if (!gotit ||
 231             (clp->lc_flags & (LCL_NEEDSCONFIRM | LCL_ADMINREVOKED))) {
 232                 if ((nd->nd_flag & ND_NFSV41) != 0 && confirmp->lval[1] != 0) {
 233                         /*
 234                          * For NFSv4.1, if confirmp->lval[1] is non-zero, the
 235                          * client is trying to update a confirmed clientid.
 236                          */
 237                         NFSLOCKV4ROOTMUTEX();
 238                         nfsv4_unlock(&nfsv4rootfs_lock, 1);
 239                         NFSUNLOCKV4ROOTMUTEX();
 240                         confirmp->lval[1] = 0;
 241                         error = NFSERR_NOENT;
 242                         goto out;
 243                 }
 244                 /*
 245                  * Get rid of the old one.
 246                  */
 247                 if (i != nfsrv_clienthashsize) {
 248                         LIST_REMOVE(clp, lc_hash);
 249                         nfsrv_cleanclient(clp, p);
 250                         nfsrv_freedeleglist(&clp->lc_deleg);
 251                         nfsrv_freedeleglist(&clp->lc_olddeleg);
 252                         zapit = 1;
 253                 }
 254                 /*
 255                  * Add it after assigning a client id to it.
 256                  */
 257                 new_clp->lc_flags |= LCL_NEEDSCONFIRM;
 258                 if ((nd->nd_flag & ND_NFSV41) != 0)
 259                         new_clp->lc_confirm.lval[0] = confirmp->lval[0] =
 260                             ++confirm_index;
 261                 else
 262                         confirmp->qval = new_clp->lc_confirm.qval =
 263                             ++confirm_index;
 264                 clientidp->lval[0] = new_clp->lc_clientid.lval[0] =
 265                     (u_int32_t)nfsrvboottime;
 266                 clientidp->lval[1] = new_clp->lc_clientid.lval[1] =
 267                     nfsrv_nextclientindex();
 268                 new_clp->lc_stateindex = 0;
 269                 new_clp->lc_statemaxindex = 0;
 270                 new_clp->lc_cbref = 0;
 271                 new_clp->lc_expiry = nfsrv_leaseexpiry();
 272                 LIST_INIT(&new_clp->lc_open);
 273                 LIST_INIT(&new_clp->lc_deleg);
 274                 LIST_INIT(&new_clp->lc_olddeleg);
 275                 LIST_INIT(&new_clp->lc_session);
 276                 for (i = 0; i < nfsrv_statehashsize; i++)
 277                         LIST_INIT(&new_clp->lc_stateid[i]);
 278                 LIST_INSERT_HEAD(NFSCLIENTHASH(new_clp->lc_clientid), new_clp,
 279                     lc_hash);
 280                 nfsstatsv1.srvclients++;
 281                 nfsrv_openpluslock++;
 282                 nfsrv_clients++;
 283                 NFSLOCKV4ROOTMUTEX();
 284                 nfsv4_unlock(&nfsv4rootfs_lock, 1);
 285                 NFSUNLOCKV4ROOTMUTEX();
 286                 if (zapit)
 287                         nfsrv_zapclient(clp, p);
 288                 *new_clpp = NULL;
 289                 goto out;
 290         }
 291
 292         /*
 293          * Now, handle the cases where the id is already issued.
 294          */
 295         if (nfsrv_notsamecredname(nd, clp)) {
 296             /*
 297              * Check to see if there is expired state that should go away.
 298              */
 299             if (clp->lc_expiry < NFSD_MONOSEC &&
 300                 (!LIST_EMPTY(&clp->lc_open) || !LIST_EMPTY(&clp->lc_deleg))) {
 301                 nfsrv_cleanclient(clp, p);
 302                 nfsrv_freedeleglist(&clp->lc_deleg);
 303             }
 304
 305             /*
 306              * If there is outstanding state, then reply NFSERR_CLIDINUSE per
 307              * RFC3530 Sec. 8.1.2 last para.
 308              */
 309             if (!LIST_EMPTY(&clp->lc_deleg)) {
 310                 hasstate = 1;
 311             } else if (LIST_EMPTY(&clp->lc_open)) {
 312                 hasstate = 0;
 313             } else {
 314                 hasstate = 0;
 315                 /* Look for an Open on the OpenOwner */
 316                 LIST_FOREACH(stp, &clp->lc_open, ls_list) {
 317                     if (!LIST_EMPTY(&stp->ls_open)) {
 318                         hasstate = 1;
 319                         break;
 320                     }
 321                 }
 322             }
 323             if (hasstate) {
 324                 /*
 325                  * If the uid doesn't match, return NFSERR_CLIDINUSE after
 326                  * filling out the correct ipaddr and portnum.
 327                  */
 328                 sad = NFSSOCKADDR(new_clp->lc_req.nr_nam, struct sockaddr_in *);
 329                 rad = NFSSOCKADDR(clp->lc_req.nr_nam, struct sockaddr_in *);
 330                 sad->sin_addr.s_addr = rad->sin_addr.s_addr;
 331                 sad->sin_port = rad->sin_port;
 332                 NFSLOCKV4ROOTMUTEX();
 333                 nfsv4_unlock(&nfsv4rootfs_lock, 1);
 334                 NFSUNLOCKV4ROOTMUTEX();
 335                 error = NFSERR_CLIDINUSE;
 336                 goto out;
 337             }
 338         }
 339
 340         if (NFSBCMP(new_clp->lc_verf, clp->lc_verf, NFSX_VERF)) {
 341                 /*
 342                  * If the verifier has changed, the client has rebooted
 343                  * and a new client id is issued. The old state info
 344                  * can be thrown away once the SETCLIENTID_CONFIRM occurs.
 345                  */
 346                 LIST_REMOVE(clp, lc_hash);
 347                 new_clp->lc_flags |= LCL_NEEDSCONFIRM;
 348                 if ((nd->nd_flag & ND_NFSV41) != 0)
 349                         new_clp->lc_confirm.lval[0] = confirmp->lval[0] =
 350                             ++confirm_index;
 351                 else
 352                         confirmp->qval = new_clp->lc_confirm.qval =
 353                             ++confirm_index;
 354                 clientidp->lval[0] = new_clp->lc_clientid.lval[0] =
 355                     nfsrvboottime;
 356                 clientidp->lval[1] = new_clp->lc_clientid.lval[1] =
 357                     nfsrv_nextclientindex();
 358                 new_clp->lc_stateindex = 0;
 359                 new_clp->lc_statemaxindex = 0;
 360                 new_clp->lc_cbref = 0;
 361                 new_clp->lc_expiry = nfsrv_leaseexpiry();
 362
 363                 /*
 364                  * Save the state until confirmed.
 365                  */
 366                 LIST_NEWHEAD(&new_clp->lc_open, &clp->lc_open, ls_list);
 367                 LIST_FOREACH(tstp, &new_clp->lc_open, ls_list)
 368                         tstp->ls_clp = new_clp;
 369                 LIST_NEWHEAD(&new_clp->lc_deleg, &clp->lc_deleg, ls_list);
 370                 LIST_FOREACH(tstp, &new_clp->lc_deleg, ls_list)
 371                         tstp->ls_clp = new_clp;
 372                 LIST_NEWHEAD(&new_clp->lc_olddeleg, &clp->lc_olddeleg,
 373                     ls_list);
 374                 LIST_FOREACH(tstp, &new_clp->lc_olddeleg, ls_list)
 375                         tstp->ls_clp = new_clp;
 376                 for (i = 0; i < nfsrv_statehashsize; i++) {
 377                         LIST_NEWHEAD(&new_clp->lc_stateid[i],
 378                             &clp->lc_stateid[i], ls_hash);
 379                         LIST_FOREACH(tstp, &new_clp->lc_stateid[i], ls_hash)
 380                                 tstp->ls_clp = new_clp;
 381                 }
 382                 LIST_INSERT_HEAD(NFSCLIENTHASH(new_clp->lc_clientid), new_clp,
 383                     lc_hash);
 384                 nfsstatsv1.srvclients++;
 385                 nfsrv_openpluslock++;
 386                 nfsrv_clients++;
 387                 NFSLOCKV4ROOTMUTEX();
 388                 nfsv4_unlock(&nfsv4rootfs_lock, 1);
 389                 NFSUNLOCKV4ROOTMUTEX();
 390
 391                 /*
 392                  * Must wait until any outstanding callback on the old clp
 393                  * completes.
 394                  */
 395                 NFSLOCKSTATE();
 396                 while (clp->lc_cbref) {
 397                         clp->lc_flags |= LCL_WAKEUPWANTED;
 398                         (void)mtx_sleep(clp, NFSSTATEMUTEXPTR, PZERO - 1,
 399                             "nfsd clp", 10 * hz);
 400                 }
 401                 NFSUNLOCKSTATE();
 402                 nfsrv_zapclient(clp, p);
 403                 *new_clpp = NULL;
 404                 goto out;
 405         }
 406
 407         /* For NFSv4.1, mark that we found a confirmed clientid. */
 408         if ((nd->nd_flag & ND_NFSV41) != 0) {
 409                 clientidp->lval[0] = clp->lc_clientid.lval[0];
 410                 clientidp->lval[1] = clp->lc_clientid.lval[1];
 411                 confirmp->lval[0] = 0;  /* Ignored by client */
 412                 confirmp->lval[1] = 1;
 413         } else {
 414                 /*
 415                  * id and verifier match, so update the net address info
 416                  * and get rid of any existing callback authentication
 417                  * handle, so a new one will be acquired.
 418                  */
 419                 LIST_REMOVE(clp, lc_hash);
 420                 new_clp->lc_flags |= (LCL_NEEDSCONFIRM | LCL_DONTCLEAN);
 421                 new_clp->lc_expiry = nfsrv_leaseexpiry();
 422                 confirmp->qval = new_clp->lc_confirm.qval = ++confirm_index;
 423                 clientidp->lval[0] = new_clp->lc_clientid.lval[0] =
 424                     clp->lc_clientid.lval[0];
 425                 clientidp->lval[1] = new_clp->lc_clientid.lval[1] =
 426                     clp->lc_clientid.lval[1];
 427                 new_clp->lc_delegtime = clp->lc_delegtime;
 428                 new_clp->lc_stateindex = clp->lc_stateindex;
 429                 new_clp->lc_statemaxindex = clp->lc_statemaxindex;
 430                 new_clp->lc_cbref = 0;
 431                 LIST_NEWHEAD(&new_clp->lc_open, &clp->lc_open, ls_list);
 432                 LIST_FOREACH(tstp, &new_clp->lc_open, ls_list)
 433                         tstp->ls_clp = new_clp;
 434                 LIST_NEWHEAD(&new_clp->lc_deleg, &clp->lc_deleg, ls_list);
 435                 LIST_FOREACH(tstp, &new_clp->lc_deleg, ls_list)
 436                         tstp->ls_clp = new_clp;
 437                 LIST_NEWHEAD(&new_clp->lc_olddeleg, &clp->lc_olddeleg, ls_list);
 438                 LIST_FOREACH(tstp, &new_clp->lc_olddeleg, ls_list)
 439                         tstp->ls_clp = new_clp;
 440                 for (i = 0; i < nfsrv_statehashsize; i++) {
 441                         LIST_NEWHEAD(&new_clp->lc_stateid[i],
 442                             &clp->lc_stateid[i], ls_hash);
 443                         LIST_FOREACH(tstp, &new_clp->lc_stateid[i], ls_hash)
 444                                 tstp->ls_clp = new_clp;
 445                 }
 446                 LIST_INSERT_HEAD(NFSCLIENTHASH(new_clp->lc_clientid), new_clp,
 447                     lc_hash);
 448                 nfsstatsv1.srvclients++;
 449                 nfsrv_openpluslock++;
 450                 nfsrv_clients++;
 451         }
 452         NFSLOCKV4ROOTMUTEX();
 453         nfsv4_unlock(&nfsv4rootfs_lock, 1);
 454         NFSUNLOCKV4ROOTMUTEX();
 455
 456         if ((nd->nd_flag & ND_NFSV41) == 0) {
 457                 /*
 458                  * Must wait until any outstanding callback on the old clp
 459                  * completes.
 460                  */
 461                 NFSLOCKSTATE();
 462                 while (clp->lc_cbref) {
 463                         clp->lc_flags |= LCL_WAKEUPWANTED;
 464                         (void)mtx_sleep(clp, NFSSTATEMUTEXPTR, PZERO - 1,
 465                             "nfsdclp", 10 * hz);
 466                 }
 467                 NFSUNLOCKSTATE();
 468                 nfsrv_zapclient(clp, p);
 469                 *new_clpp = NULL;
 470         }
 471
 472 out:
 473         NFSEXITCODE2(error, nd);
 474         return (error);
 475 }
 476
 477 /*
 478  * Check to see if the client id exists and optionally confirm it.
 479  */
 480 APPLESTATIC int
 481 nfsrv_getclient(nfsquad_t clientid, int opflags, struct nfsclient **clpp,
 482     struct nfsdsession *nsep, nfsquad_t confirm, uint32_t cbprogram,
 483     struct nfsrv_descript *nd, NFSPROC_T *p)
 484 {
 485         struct nfsclient *clp;
 486         struct nfsstate *stp;
 487         int i;
 488         struct nfsclienthashhead *hp;
 489         int error = 0, igotlock, doneok;
 490         struct nfssessionhash *shp;
 491         struct nfsdsession *sep;
 492         uint64_t sessid[2];
 493         static uint64_t next_sess = 0;
 494
 495         if (clpp)
 496                 *clpp = NULL;
 497         if ((nd == NULL || (nd->nd_flag & ND_NFSV41) == 0 ||
 498             opflags != CLOPS_RENEW) && nfsrvboottime != clientid.lval[0]) {
 499                 error = NFSERR_STALECLIENTID;
 500                 goto out;
 501         }
 502
 503         /*
 504          * If called with opflags == CLOPS_RENEW, the State Lock is
 505          * already held. Otherwise, we need to get either that or,
 506          * for the case of Confirm, lock out the nfsd threads.
 507          */
 508         if (opflags & CLOPS_CONFIRM) {
 509                 NFSLOCKV4ROOTMUTEX();
 510                 nfsv4_relref(&nfsv4rootfs_lock);
 511                 do {
 512                         igotlock = nfsv4_lock(&nfsv4rootfs_lock, 1, NULL,
 513                             NFSV4ROOTLOCKMUTEXPTR, NULL);
 514                 } while (!igotlock);
 515                 /*
 516                  * Create a new sessionid here, since we need to do it where
 517                  * there is a mutex held to serialize update of next_sess.
 518                  */
 519                 if ((nd->nd_flag & ND_NFSV41) != 0) {
 520                         sessid[0] = ++next_sess;
 521                         sessid[1] = clientid.qval;
 522                 }
 523                 NFSUNLOCKV4ROOTMUTEX();
 524         } else if (opflags != CLOPS_RENEW) {
 525                 NFSLOCKSTATE();
 526         }
 527
 528         /* For NFSv4.1, the clp is acquired from the associated session. */
 529         if (nd != NULL && (nd->nd_flag & ND_NFSV41) != 0 &&
 530             opflags == CLOPS_RENEW) {
 531                 clp = NULL;
 532                 if ((nd->nd_flag & ND_HASSEQUENCE) != 0) {
 533                         shp = NFSSESSIONHASH(nd->nd_sessionid);
 534                         NFSLOCKSESSION(shp);
 535                         sep = nfsrv_findsession(nd->nd_sessionid);
 536                         if (sep != NULL)
 537                                 clp = sep->sess_clp;
 538                         NFSUNLOCKSESSION(shp);
 539                 }
 540         } else {
 541                 hp = NFSCLIENTHASH(clientid);
 542                 LIST_FOREACH(clp, hp, lc_hash) {
 543                         if (clp->lc_clientid.lval[1] == clientid.lval[1])
 544                                 break;
 545                 }
 546         }
 547         if (clp == NULL) {
 548                 if (opflags & CLOPS_CONFIRM)
 549                         error = NFSERR_STALECLIENTID;
 550                 else
 551                         error = NFSERR_EXPIRED;
 552         } else if (clp->lc_flags & LCL_ADMINREVOKED) {
 553                 /*
 554                  * If marked admin revoked, just return the error.
 555                  */
 556                 error = NFSERR_ADMINREVOKED;
 557         }
 558         if (error) {
 559                 if (opflags & CLOPS_CONFIRM) {
 560                         NFSLOCKV4ROOTMUTEX();
 561                         nfsv4_unlock(&nfsv4rootfs_lock, 1);
 562                         NFSUNLOCKV4ROOTMUTEX();
 563                 } else if (opflags != CLOPS_RENEW) {
 564                         NFSUNLOCKSTATE();
 565                 }
 566                 goto out;
 567         }
 568
 569         /*
 570          * Perform any operations specified by the opflags.
 571          */
 572         if (opflags & CLOPS_CONFIRM) {
 573                 if (((nd->nd_flag & ND_NFSV41) != 0 &&
 574                      clp->lc_confirm.lval[0] != confirm.lval[0]) ||
 575                     ((nd->nd_flag & ND_NFSV41) == 0 &&
 576                      clp->lc_confirm.qval != confirm.qval))
 577                         error = NFSERR_STALECLIENTID;
 578                 else if (nfsrv_notsamecredname(nd, clp))
 579                         error = NFSERR_CLIDINUSE;
 580
 581                 if (!error) {
 582                     if ((clp->lc_flags & (LCL_NEEDSCONFIRM | LCL_DONTCLEAN)) ==
 583                         LCL_NEEDSCONFIRM) {
 584                         /*
 585                          * Hang onto the delegations (as old delegations)
 586                          * for an Open with CLAIM_DELEGATE_PREV unless in
 587                          * grace, but get rid of the rest of the state.
 588                          */
 589                         nfsrv_cleanclient(clp, p);
 590                         nfsrv_freedeleglist(&clp->lc_olddeleg);
 591                         if (nfsrv_checkgrace(nd, clp, 0)) {
 592                             /* In grace, so just delete delegations */
 593                             nfsrv_freedeleglist(&clp->lc_deleg);
 594                         } else {
 595                             LIST_FOREACH(stp, &clp->lc_deleg, ls_list)
 596                                 stp->ls_flags |= NFSLCK_OLDDELEG;
 597                             clp->lc_delegtime = NFSD_MONOSEC +
 598                                 nfsrv_lease + NFSRV_LEASEDELTA;
 599                             LIST_NEWHEAD(&clp->lc_olddeleg, &clp->lc_deleg,
 600                                 ls_list);
 601                         }
 602                         if ((nd->nd_flag & ND_NFSV41) != 0)
 603                             clp->lc_program = cbprogram;
 604                     }
 605                     clp->lc_flags &= ~(LCL_NEEDSCONFIRM | LCL_DONTCLEAN);
 606                     if (clp->lc_program)
 607                         clp->lc_flags |= LCL_NEEDSCBNULL;
 608                     /* For NFSv4.1, link the session onto the client. */
 609                     if (nsep != NULL) {
 610                         /* Hold a reference on the xprt for a backchannel. */
 611                         if ((nsep->sess_crflags & NFSV4CRSESS_CONNBACKCHAN)
 612                             != 0 && clp->lc_req.nr_client == NULL) {
 613                             clp->lc_req.nr_client = (struct __rpc_client *)
 614                                 clnt_bck_create(nd->nd_xprt->xp_socket,
 615                                 cbprogram, NFSV4_CBVERS);
 616                             if (clp->lc_req.nr_client != NULL) {
 617                                 SVC_ACQUIRE(nd->nd_xprt);
 618                                 nd->nd_xprt->xp_p2 =
 619                                     clp->lc_req.nr_client->cl_private;
 620                                 /* Disable idle timeout. */
 621                                 nd->nd_xprt->xp_idletimeout = 0;
 622                                 nsep->sess_cbsess.nfsess_xprt = nd->nd_xprt;
 623                             } else
 624                                 nsep->sess_crflags &= ~NFSV4CRSESS_CONNBACKCHAN;
 625                         }
 626                         NFSBCOPY(sessid, nsep->sess_sessionid,
 627                             NFSX_V4SESSIONID);
 628                         NFSBCOPY(sessid, nsep->sess_cbsess.nfsess_sessionid,
 629                             NFSX_V4SESSIONID);
 630                         shp = NFSSESSIONHASH(nsep->sess_sessionid);
 631                         NFSLOCKSTATE();
 632                         NFSLOCKSESSION(shp);
 633                         LIST_INSERT_HEAD(&shp->list, nsep, sess_hash);
 634                         LIST_INSERT_HEAD(&clp->lc_session, nsep, sess_list);
 635                         nsep->sess_clp = clp;
 636                         NFSUNLOCKSESSION(shp);
 637                         NFSUNLOCKSTATE();
 638                     }
 639                 }
 640         } else if (clp->lc_flags & LCL_NEEDSCONFIRM) {
 641                 error = NFSERR_EXPIRED;
 642         }
 643
 644         /*
 645          * If called by the Renew Op, we must check the principal.
 646          */
 647         if (!error && (opflags & CLOPS_RENEWOP)) {
 648             if (nfsrv_notsamecredname(nd, clp)) {
 649                 doneok = 0;
 650                 for (i = 0; i < nfsrv_statehashsize && doneok == 0; i++) {
 651                     LIST_FOREACH(stp, &clp->lc_stateid[i], ls_hash) {
 652                         if ((stp->ls_flags & NFSLCK_OPEN) &&
 653                             stp->ls_uid == nd->nd_cred->cr_uid) {
 654                                 doneok = 1;
 655                                 break;
 656                         }
 657                     }
 658                 }
 659                 if (!doneok)
 660                         error = NFSERR_ACCES;
 661             }
 662             if (!error && (clp->lc_flags & LCL_CBDOWN))
 663                 error = NFSERR_CBPATHDOWN;
 664         }
 665         if ((!error || error == NFSERR_CBPATHDOWN) &&
 666              (opflags & CLOPS_RENEW)) {
 667                 clp->lc_expiry = nfsrv_leaseexpiry();
 668         }
 669         if (opflags & CLOPS_CONFIRM) {
 670                 NFSLOCKV4ROOTMUTEX();
 671                 nfsv4_unlock(&nfsv4rootfs_lock, 1);
 672                 NFSUNLOCKV4ROOTMUTEX();
 673         } else if (opflags != CLOPS_RENEW) {
 674                 NFSUNLOCKSTATE();
 675         }
 676         if (clpp)
 677                 *clpp = clp;
 678
 679 out:
 680         NFSEXITCODE2(error, nd);
 681         return (error);
 682 }
 683
 684 /*
 685  * Perform the NFSv4.1 destroy clientid.
 686  */
 687 int
 688 nfsrv_destroyclient(nfsquad_t clientid, NFSPROC_T *p)
 689 {
 690         struct nfsclient *clp;
 691         struct nfsclienthashhead *hp;
 692         int error = 0, i, igotlock;
 693
 694         if (nfsrvboottime != clientid.lval[0]) {
 695                 error = NFSERR_STALECLIENTID;
 696                 goto out;
 697         }
 698
 699         /* Lock out other nfsd threads */
 700         NFSLOCKV4ROOTMUTEX();
 701         nfsv4_relref(&nfsv4rootfs_lock);
 702         do {
 703                 igotlock = nfsv4_lock(&nfsv4rootfs_lock, 1, NULL,
 704                     NFSV4ROOTLOCKMUTEXPTR, NULL);
 705         } while (igotlock == 0);
 706         NFSUNLOCKV4ROOTMUTEX();
 707
 708         hp = NFSCLIENTHASH(clientid);
 709         LIST_FOREACH(clp, hp, lc_hash) {
 710                 if (clp->lc_clientid.lval[1] == clientid.lval[1])
 711                         break;
 712         }
 713         if (clp == NULL) {
 714                 NFSLOCKV4ROOTMUTEX();
 715                 nfsv4_unlock(&nfsv4rootfs_lock, 1);
 716                 NFSUNLOCKV4ROOTMUTEX();
 717                 /* Just return ok, since it is gone. */
 718                 goto out;
 719         }
 720
 721         /* Scan for state on the clientid. */
 722         for (i = 0; i < nfsrv_statehashsize; i++)
 723                 if (!LIST_EMPTY(&clp->lc_stateid[i])) {
 724                         NFSLOCKV4ROOTMUTEX();
 725                         nfsv4_unlock(&nfsv4rootfs_lock, 1);
 726                         NFSUNLOCKV4ROOTMUTEX();
 727                         error = NFSERR_CLIENTIDBUSY;
 728                         goto out;
 729                 }
 730         if (!LIST_EMPTY(&clp->lc_session) || !LIST_EMPTY(&clp->lc_deleg)) {
 731                 NFSLOCKV4ROOTMUTEX();
 732                 nfsv4_unlock(&nfsv4rootfs_lock, 1);
 733                 NFSUNLOCKV4ROOTMUTEX();
 734                 error = NFSERR_CLIENTIDBUSY;
 735                 goto out;
 736         }
 737
 738         /* Destroy the clientid and return ok. */
 739         nfsrv_cleanclient(clp, p);
 740         nfsrv_freedeleglist(&clp->lc_deleg);
 741         nfsrv_freedeleglist(&clp->lc_olddeleg);
 742         LIST_REMOVE(clp, lc_hash);
 743         NFSLOCKV4ROOTMUTEX();
 744         nfsv4_unlock(&nfsv4rootfs_lock, 1);
 745         NFSUNLOCKV4ROOTMUTEX();
 746         nfsrv_zapclient(clp, p);
 747 out:
 748         NFSEXITCODE2(error, nd);
 749         return (error);
 750 }
 751
 752 /*
 753  * Called from the new nfssvc syscall to admin revoke a clientid.
 754  * Returns 0 for success, error otherwise.
 755  */
 756 APPLESTATIC int
 757 nfsrv_adminrevoke(struct nfsd_clid *revokep, NFSPROC_T *p)
 758 {
 759         struct nfsclient *clp = NULL;
 760         int i, error = 0;
 761         int gotit, igotlock;
 762
 763         /*
 764          * First, lock out the nfsd so that state won't change while the
 765          * revocation record is being written to the stable storage restart
 766          * file.
 767          */
 768         NFSLOCKV4ROOTMUTEX();
 769         do {
 770                 igotlock = nfsv4_lock(&nfsv4rootfs_lock, 1, NULL,
 771                     NFSV4ROOTLOCKMUTEXPTR, NULL);
 772         } while (!igotlock);
 773         NFSUNLOCKV4ROOTMUTEX();
 774
 775         /*
 776          * Search for a match in the client list.
 777          */
 778         gotit = i = 0;
 779         while (i < nfsrv_clienthashsize && !gotit) {
 780             LIST_FOREACH(clp, &nfsclienthash[i], lc_hash) {
 781                 if (revokep->nclid_idlen == clp->lc_idlen &&
 782                     !NFSBCMP(revokep->nclid_id, clp->lc_id, clp->lc_idlen)) {
 783                         gotit = 1;
 784                         break;
 785                 }
 786             }
 787             i++;
 788         }
 789         if (!gotit) {
 790                 NFSLOCKV4ROOTMUTEX();
 791                 nfsv4_unlock(&nfsv4rootfs_lock, 0);
 792                 NFSUNLOCKV4ROOTMUTEX();
 793                 error = EPERM;
 794                 goto out;
 795         }
 796
 797         /*
 798          * Now, write out the revocation record
 799          */
 800         nfsrv_writestable(clp->lc_id, clp->lc_idlen, NFSNST_REVOKE, p);
 801         nfsrv_backupstable();
 802
 803         /*
 804          * and clear out the state, marking the clientid revoked.
 805          */
 806         clp->lc_flags &= ~LCL_CALLBACKSON;
 807         clp->lc_flags |= LCL_ADMINREVOKED;
 808         nfsrv_cleanclient(clp, p);
 809         nfsrv_freedeleglist(&clp->lc_deleg);
 810         nfsrv_freedeleglist(&clp->lc_olddeleg);
 811         NFSLOCKV4ROOTMUTEX();
 812         nfsv4_unlock(&nfsv4rootfs_lock, 0);
 813         NFSUNLOCKV4ROOTMUTEX();
 814
 815 out:
 816         NFSEXITCODE(error);
 817         return (error);
 818 }
 819
 820 /*
 821  * Dump out stats for all clients. Called from nfssvc(2), that is used
 822  * nfsstatsv1.
 823  */
 824 APPLESTATIC void
 825 nfsrv_dumpclients(struct nfsd_dumpclients *dumpp, int maxcnt)
 826 {
 827         struct nfsclient *clp;
 828         int i = 0, cnt = 0;
 829
 830         /*
 831          * First, get a reference on the nfsv4rootfs_lock so that an
 832          * exclusive lock cannot be acquired while dumping the clients.
 833          */
 834         NFSLOCKV4ROOTMUTEX();
 835         nfsv4_getref(&nfsv4rootfs_lock, NULL, NFSV4ROOTLOCKMUTEXPTR, NULL);
 836         NFSUNLOCKV4ROOTMUTEX();
 837         NFSLOCKSTATE();
 838         /*
 839          * Rattle through the client lists until done.
 840          */
 841         while (i < nfsrv_clienthashsize && cnt < maxcnt) {
 842             clp = LIST_FIRST(&nfsclienthash[i]);
 843             while (clp != LIST_END(&nfsclienthash[i]) && cnt < maxcnt) {
 844                 nfsrv_dumpaclient(clp, &dumpp[cnt]);
 845                 cnt++;
 846                 clp = LIST_NEXT(clp, lc_hash);
 847             }
 848             i++;
 849         }
 850         if (cnt < maxcnt)
 851             dumpp[cnt].ndcl_clid.nclid_idlen = 0;
 852         NFSUNLOCKSTATE();
 853         NFSLOCKV4ROOTMUTEX();
 854         nfsv4_relref(&nfsv4rootfs_lock);
 855         NFSUNLOCKV4ROOTMUTEX();
 856 }
 857
 858 /*
 859  * Dump stats for a client. Must be called with the NFSSTATELOCK and spl'd.
 860  */
 861 static void
 862 nfsrv_dumpaclient(struct nfsclient *clp, struct nfsd_dumpclients *dumpp)
 863 {
 864         struct nfsstate *stp, *openstp, *lckownstp;
 865         struct nfslock *lop;
 866         struct sockaddr *sad;
 867         struct sockaddr_in *rad;
 868         struct sockaddr_in6 *rad6;
 869
 870         dumpp->ndcl_nopenowners = dumpp->ndcl_nlockowners = 0;
 871         dumpp->ndcl_nopens = dumpp->ndcl_nlocks = 0;
 872         dumpp->ndcl_ndelegs = dumpp->ndcl_nolddelegs = 0;
 873         dumpp->ndcl_flags = clp->lc_flags;
 874         dumpp->ndcl_clid.nclid_idlen = clp->lc_idlen;
 875         NFSBCOPY(clp->lc_id, dumpp->ndcl_clid.nclid_id, clp->lc_idlen);
 876         sad = NFSSOCKADDR(clp->lc_req.nr_nam, struct sockaddr *);
 877         dumpp->ndcl_addrfam = sad->sa_family;
 878         if (sad->sa_family == AF_INET) {
 879                 rad = (struct sockaddr_in *)sad;
 880                 dumpp->ndcl_cbaddr.sin_addr = rad->sin_addr;
 881         } else {
 882                 rad6 = (struct sockaddr_in6 *)sad;
 883                 dumpp->ndcl_cbaddr.sin6_addr = rad6->sin6_addr;
 884         }
 885
 886         /*
 887          * Now, scan the state lists and total up the opens and locks.
 888          */
 889         LIST_FOREACH(stp, &clp->lc_open, ls_list) {
 890             dumpp->ndcl_nopenowners++;
 891             LIST_FOREACH(openstp, &stp->ls_open, ls_list) {
 892                 dumpp->ndcl_nopens++;
 893                 LIST_FOREACH(lckownstp, &openstp->ls_open, ls_list) {
 894                     dumpp->ndcl_nlockowners++;
 895                     LIST_FOREACH(lop, &lckownstp->ls_lock, lo_lckowner) {
 896                         dumpp->ndcl_nlocks++;
 897                     }
 898                 }
 899             }
 900         }
 901
 902         /*
 903          * and the delegation lists.
 904          */
 905         LIST_FOREACH(stp, &clp->lc_deleg, ls_list) {
 906             dumpp->ndcl_ndelegs++;
 907         }
 908         LIST_FOREACH(stp, &clp->lc_olddeleg, ls_list) {
 909             dumpp->ndcl_nolddelegs++;
 910         }
 911 }
 912
 913 /*
 914  * Dump out lock stats for a file.
 915  */
 916 APPLESTATIC void
 917 nfsrv_dumplocks(vnode_t vp, struct nfsd_dumplocks *ldumpp, int maxcnt,
 918     NFSPROC_T *p)
 919 {
 920         struct nfsstate *stp;
 921         struct nfslock *lop;
 922         int cnt = 0;
 923         struct nfslockfile *lfp;
 924         struct sockaddr *sad;
 925         struct sockaddr_in *rad;
 926         struct sockaddr_in6 *rad6;
 927         int ret;
 928         fhandle_t nfh;
 929
 930         ret = nfsrv_getlockfh(vp, 0, NULL, &nfh, p);
 931         /*
 932          * First, get a reference on the nfsv4rootfs_lock so that an
 933          * exclusive lock on it cannot be acquired while dumping the locks.
 934          */
 935         NFSLOCKV4ROOTMUTEX();
 936         nfsv4_getref(&nfsv4rootfs_lock, NULL, NFSV4ROOTLOCKMUTEXPTR, NULL);
 937         NFSUNLOCKV4ROOTMUTEX();
 938         NFSLOCKSTATE();
 939         if (!ret)
 940                 ret = nfsrv_getlockfile(0, NULL, &lfp, &nfh, 0);
 941         if (ret) {
 942                 ldumpp[0].ndlck_clid.nclid_idlen = 0;
 943                 NFSUNLOCKSTATE();
 944                 NFSLOCKV4ROOTMUTEX();
 945                 nfsv4_relref(&nfsv4rootfs_lock);
 946                 NFSUNLOCKV4ROOTMUTEX();
 947                 return;
 948         }
 949
 950         /*
 951          * For each open share on file, dump it out.
 952          */
 953         stp = LIST_FIRST(&lfp->lf_open);
 954         while (stp != LIST_END(&lfp->lf_open) && cnt < maxcnt) {
 955                 ldumpp[cnt].ndlck_flags = stp->ls_flags;
 956                 ldumpp[cnt].ndlck_stateid.seqid = stp->ls_stateid.seqid;
 957                 ldumpp[cnt].ndlck_stateid.other[0] = stp->ls_stateid.other[0];
 958                 ldumpp[cnt].ndlck_stateid.other[1] = stp->ls_stateid.other[1];
 959                 ldumpp[cnt].ndlck_stateid.other[2] = stp->ls_stateid.other[2];
 960                 ldumpp[cnt].ndlck_owner.nclid_idlen =
 961                     stp->ls_openowner->ls_ownerlen;
 962                 NFSBCOPY(stp->ls_openowner->ls_owner,
 963                     ldumpp[cnt].ndlck_owner.nclid_id,
 964                     stp->ls_openowner->ls_ownerlen);
 965                 ldumpp[cnt].ndlck_clid.nclid_idlen = stp->ls_clp->lc_idlen;
 966                 NFSBCOPY(stp->ls_clp->lc_id, ldumpp[cnt].ndlck_clid.nclid_id,
 967                     stp->ls_clp->lc_idlen);
 968                 sad=NFSSOCKADDR(stp->ls_clp->lc_req.nr_nam, struct sockaddr *);
 969                 ldumpp[cnt].ndlck_addrfam = sad->sa_family;
 970                 if (sad->sa_family == AF_INET) {
 971                         rad = (struct sockaddr_in *)sad;
 972                         ldumpp[cnt].ndlck_cbaddr.sin_addr = rad->sin_addr;
 973                 } else {
 974                         rad6 = (struct sockaddr_in6 *)sad;
 975                         ldumpp[cnt].ndlck_cbaddr.sin6_addr = rad6->sin6_addr;
 976                 }
 977                 stp = LIST_NEXT(stp, ls_file);
 978                 cnt++;
 979         }
 980
 981         /*
 982          * and all locks.
 983          */
 984         lop = LIST_FIRST(&lfp->lf_lock);
 985         while (lop != LIST_END(&lfp->lf_lock) && cnt < maxcnt) {
 986                 stp = lop->lo_stp;
 987                 ldumpp[cnt].ndlck_flags = lop->lo_flags;
 988                 ldumpp[cnt].ndlck_first = lop->lo_first;
 989                 ldumpp[cnt].ndlck_end = lop->lo_end;
 990                 ldumpp[cnt].ndlck_stateid.seqid = stp->ls_stateid.seqid;
 991                 ldumpp[cnt].ndlck_stateid.other[0] = stp->ls_stateid.other[0];
 992                 ldumpp[cnt].ndlck_stateid.other[1] = stp->ls_stateid.other[1];
 993                 ldumpp[cnt].ndlck_stateid.other[2] = stp->ls_stateid.other[2];
 994                 ldumpp[cnt].ndlck_owner.nclid_idlen = stp->ls_ownerlen;
 995                 NFSBCOPY(stp->ls_owner, ldumpp[cnt].ndlck_owner.nclid_id,
 996                     stp->ls_ownerlen);
 997                 ldumpp[cnt].ndlck_clid.nclid_idlen = stp->ls_clp->lc_idlen;
 998                 NFSBCOPY(stp->ls_clp->lc_id, ldumpp[cnt].ndlck_clid.nclid_id,
 999                     stp->ls_clp->lc_idlen);
1000                 sad=NFSSOCKADDR(stp->ls_clp->lc_req.nr_nam, struct sockaddr *);
1001                 ldumpp[cnt].ndlck_addrfam = sad->sa_family;
1002                 if (sad->sa_family == AF_INET) {
1003                         rad = (struct sockaddr_in *)sad;
1004                         ldumpp[cnt].ndlck_cbaddr.sin_addr = rad->sin_addr;
1005                 } else {
1006                         rad6 = (struct sockaddr_in6 *)sad;
1007                         ldumpp[cnt].ndlck_cbaddr.sin6_addr = rad6->sin6_addr;
1008                 }
1009                 lop = LIST_NEXT(lop, lo_lckfile);
1010                 cnt++;
1011         }
1012
1013         /*
1014          * and the delegations.
1015          */
1016         stp = LIST_FIRST(&lfp->lf_deleg);
1017         while (stp != LIST_END(&lfp->lf_deleg) && cnt < maxcnt) {
1018                 ldumpp[cnt].ndlck_flags = stp->ls_flags;
1019                 ldumpp[cnt].ndlck_stateid.seqid = stp->ls_stateid.seqid;
1020                 ldumpp[cnt].ndlck_stateid.other[0] = stp->ls_stateid.other[0];
1021                 ldumpp[cnt].ndlck_stateid.other[1] = stp->ls_stateid.other[1];
1022                 ldumpp[cnt].ndlck_stateid.other[2] = stp->ls_stateid.other[2];
1023                 ldumpp[cnt].ndlck_owner.nclid_idlen = 0;
1024                 ldumpp[cnt].ndlck_clid.nclid_idlen = stp->ls_clp->lc_idlen;
1025                 NFSBCOPY(stp->ls_clp->lc_id, ldumpp[cnt].ndlck_clid.nclid_id,
1026                     stp->ls_clp->lc_idlen);
1027                 sad=NFSSOCKADDR(stp->ls_clp->lc_req.nr_nam, struct sockaddr *);
1028                 ldumpp[cnt].ndlck_addrfam = sad->sa_family;
1029                 if (sad->sa_family == AF_INET) {
1030                         rad = (struct sockaddr_in *)sad;
1031                         ldumpp[cnt].ndlck_cbaddr.sin_addr = rad->sin_addr;
1032                 } else {
1033                         rad6 = (struct sockaddr_in6 *)sad;
1034                         ldumpp[cnt].ndlck_cbaddr.sin6_addr = rad6->sin6_addr;
1035                 }
1036                 stp = LIST_NEXT(stp, ls_file);
1037                 cnt++;
1038         }
1039
1040         /*
1041          * If list isn't full, mark end of list by setting the client name
1042          * to zero length.
1043          */
1044         if (cnt < maxcnt)
1045                 ldumpp[cnt].ndlck_clid.nclid_idlen = 0;
1046         NFSUNLOCKSTATE();
1047         NFSLOCKV4ROOTMUTEX();
1048         nfsv4_relref(&nfsv4rootfs_lock);
1049         NFSUNLOCKV4ROOTMUTEX();
1050 }
1051
1052 /*
1053  * Server timer routine. It can scan any linked list, so long
1054  * as it holds the spin/mutex lock and there is no exclusive lock on
1055  * nfsv4rootfs_lock.
1056  * (For OpenBSD, a kthread is ok. For FreeBSD, I think it is ok
1057  *  to do this from a callout, since the spin locks work. For
1058  *  Darwin, I'm not sure what will work correctly yet.)
1059  * Should be called once per second.
1060  */
1061 APPLESTATIC void
1062 nfsrv_servertimer(void)
1063 {
1064         struct nfsclient *clp, *nclp;
1065         struct nfsstate *stp, *nstp;
1066         int got_ref, i;
1067
1068         /*
1069          * Make sure nfsboottime is set. This is used by V3 as well
1070          * as V4. Note that nfsboottime is not nfsrvboottime, which is
1071          * only used by the V4 server for leases.
1072          */
1073         if (nfsboottime.tv_sec == 0)
1074                 NFSSETBOOTTIME(nfsboottime);
1075
1076         /*
1077          * If server hasn't started yet, just return.
1078          */
1079         NFSLOCKSTATE();
1080         if (nfsrv_stablefirst.nsf_eograce == 0) {
1081                 NFSUNLOCKSTATE();
1082                 return;
1083         }
1084         if (!(nfsrv_stablefirst.nsf_flags & NFSNSF_UPDATEDONE)) {
1085                 if (!(nfsrv_stablefirst.nsf_flags & NFSNSF_GRACEOVER) &&
1086                     NFSD_MONOSEC > nfsrv_stablefirst.nsf_eograce)
1087                         nfsrv_stablefirst.nsf_flags |=
1088                             (NFSNSF_GRACEOVER | NFSNSF_NEEDLOCK);
1089                 NFSUNLOCKSTATE();
1090                 return;
1091         }
1092
1093         /*
1094          * Try and get a reference count on the nfsv4rootfs_lock so that
1095          * no nfsd thread can acquire an exclusive lock on it before this
1096          * call is done. If it is already exclusively locked, just return.
1097          */
1098         NFSLOCKV4ROOTMUTEX();
1099         got_ref = nfsv4_getref_nonblock(&nfsv4rootfs_lock);
1100         NFSUNLOCKV4ROOTMUTEX();
1101         if (got_ref == 0) {
1102                 NFSUNLOCKSTATE();
1103                 return;
1104         }
1105
1106         /*
1107          * For each client...
1108          */
1109         for (i = 0; i < nfsrv_clienthashsize; i++) {
1110             clp = LIST_FIRST(&nfsclienthash[i]);
1111             while (clp != LIST_END(&nfsclienthash[i])) {
1112                 nclp = LIST_NEXT(clp, lc_hash);
1113                 if (!(clp->lc_flags & LCL_EXPIREIT)) {
1114                     if (((clp->lc_expiry + NFSRV_STALELEASE) < NFSD_MONOSEC
1115                          && ((LIST_EMPTY(&clp->lc_deleg)
1116                               && LIST_EMPTY(&clp->lc_open)) ||
1117                              nfsrv_clients > nfsrv_clienthighwater)) ||
1118                         (clp->lc_expiry + NFSRV_MOULDYLEASE) < NFSD_MONOSEC ||
1119                         (clp->lc_expiry < NFSD_MONOSEC &&
1120                          (nfsrv_openpluslock * 10 / 9) > nfsrv_v4statelimit)) {
1121                         /*
1122                          * Lease has expired several nfsrv_lease times ago:
1123                          * PLUS
1124                          *    - no state is associated with it
1125                          *    OR
1126                          *    - above high water mark for number of clients
1127                          *      (nfsrv_clienthighwater should be large enough
1128                          *       that this only occurs when clients fail to
1129                          *       use the same nfs_client_id4.id. Maybe somewhat
1130                          *       higher that the maximum number of clients that
1131                          *       will mount this server?)
1132                          * OR
1133                          * Lease has expired a very long time ago
1134                          * OR
1135                          * Lease has expired PLUS the number of opens + locks
1136                          * has exceeded 90% of capacity
1137                          *
1138                          * --> Mark for expiry. The actual expiry will be done
1139                          *     by an nfsd sometime soon.
1140                          */
1141                         clp->lc_flags |= LCL_EXPIREIT;
1142                         nfsrv_stablefirst.nsf_flags |=
1143                             (NFSNSF_NEEDLOCK | NFSNSF_EXPIREDCLIENT);
1144                     } else {
1145                         /*
1146                          * If there are no opens, increment no open tick cnt
1147                          * If time exceeds NFSNOOPEN, mark it to be thrown away
1148                          * otherwise, if there is an open, reset no open time
1149                          * Hopefully, this will avoid excessive re-creation
1150                          * of open owners and subsequent open confirms.
1151                          */
1152                         stp = LIST_FIRST(&clp->lc_open);
1153                         while (stp != LIST_END(&clp->lc_open)) {
1154                                 nstp = LIST_NEXT(stp, ls_list);
1155                                 if (LIST_EMPTY(&stp->ls_open)) {
1156                                         stp->ls_noopens++;
1157                                         if (stp->ls_noopens > NFSNOOPEN ||
1158                                             (nfsrv_openpluslock * 2) >
1159                                             nfsrv_v4statelimit)
1160                                                 nfsrv_stablefirst.nsf_flags |=
1161                                                         NFSNSF_NOOPENS;
1162                                 } else {
1163                                         stp->ls_noopens = 0;
1164                                 }
1165                                 stp = nstp;
1166                         }
1167                     }
1168                 }
1169                 clp = nclp;
1170             }
1171         }
1172         NFSUNLOCKSTATE();
1173         NFSLOCKV4ROOTMUTEX();
1174         nfsv4_relref(&nfsv4rootfs_lock);
1175         NFSUNLOCKV4ROOTMUTEX();
1176 }
1177
1178 /*
1179  * The following set of functions free up the various data structures.
1180  */
1181 /*
1182  * Clear out all open/lock state related to this nfsclient.
1183  * Caller must hold an exclusive lock on nfsv4rootfs_lock, so that
1184  * there are no other active nfsd threads.
1185  */
1186 APPLESTATIC void
1187 nfsrv_cleanclient(struct nfsclient *clp, NFSPROC_T *p)
1188 {
1189         struct nfsstate *stp, *nstp;
1190         struct nfsdsession *sep, *nsep;
1191
1192         LIST_FOREACH_SAFE(stp, &clp->lc_open, ls_list, nstp)
1193                 nfsrv_freeopenowner(stp, 1, p);
1194         if ((clp->lc_flags & LCL_ADMINREVOKED) == 0)
1195                 LIST_FOREACH_SAFE(sep, &clp->lc_session, sess_list, nsep)
1196                         (void)nfsrv_freesession(sep, NULL);
1197 }
1198
1199 /*
1200  * Free a client that has been cleaned. It should also already have been
1201  * removed from the lists.
1202  * (Just to be safe w.r.t. newnfs_disconnect(), call this function when
1203  *  softclock interrupts are enabled.)
1204  */
1205 APPLESTATIC void
1206 nfsrv_zapclient(struct nfsclient *clp, NFSPROC_T *p)
1207 {
1208
1209 #ifdef notyet
1210         if ((clp->lc_flags & (LCL_GSS | LCL_CALLBACKSON)) ==
1211              (LCL_GSS | LCL_CALLBACKSON) &&
1212             (clp->lc_hand.nfsh_flag & NFSG_COMPLETE) &&
1213             clp->lc_handlelen > 0) {
1214                 clp->lc_hand.nfsh_flag &= ~NFSG_COMPLETE;
1215                 clp->lc_hand.nfsh_flag |= NFSG_DESTROYED;
1216                 (void) nfsrv_docallback(clp, NFSV4PROC_CBNULL,
1217                         NULL, 0, NULL, NULL, NULL, p);
1218         }
1219 #endif
1220         newnfs_disconnect(&clp->lc_req);
1221         NFSSOCKADDRFREE(clp->lc_req.nr_nam);
1222         NFSFREEMUTEX(&clp->lc_req.nr_mtx);
1223         free(clp->lc_stateid, M_NFSDCLIENT);
1224         free(clp, M_NFSDCLIENT);
1225         NFSLOCKSTATE();
1226         nfsstatsv1.srvclients--;
1227         nfsrv_openpluslock--;
1228         nfsrv_clients--;
1229         NFSUNLOCKSTATE();
1230 }
1231
1232 /*
1233  * Free a list of delegation state structures.
1234  * (This function will also free all nfslockfile structures that no
1235  *  longer have associated state.)
1236  */
1237 APPLESTATIC void
1238 nfsrv_freedeleglist(struct nfsstatehead *sthp)
1239 {
1240         struct nfsstate *stp, *nstp;
1241
1242         LIST_FOREACH_SAFE(stp, sthp, ls_list, nstp) {
1243                 nfsrv_freedeleg(stp);
1244         }
1245         LIST_INIT(sthp);
1246 }
1247
1248 /*
1249  * Free up a delegation.
1250  */
1251 static void
1252 nfsrv_freedeleg(struct nfsstate *stp)
1253 {
1254         struct nfslockfile *lfp;
1255
1256         LIST_REMOVE(stp, ls_hash);
1257         LIST_REMOVE(stp, ls_list);
1258         LIST_REMOVE(stp, ls_file);
1259         lfp = stp->ls_lfp;
1260         if (LIST_EMPTY(&lfp->lf_open) &&
1261             LIST_EMPTY(&lfp->lf_lock) && LIST_EMPTY(&lfp->lf_deleg) &&
1262             LIST_EMPTY(&lfp->lf_locallock) && LIST_EMPTY(&lfp->lf_rollback) &&
1263             lfp->lf_usecount == 0 &&
1264             nfsv4_testlock(&lfp->lf_locallock_lck) == 0)
1265                 nfsrv_freenfslockfile(lfp);
1266         FREE((caddr_t)stp, M_NFSDSTATE);
1267         nfsstatsv1.srvdelegates--;
1268         nfsrv_openpluslock--;
1269         nfsrv_delegatecnt--;
1270 }
1271
1272 /*
1273  * This function frees an open owner and all associated opens.
1274  */
1275 static void
1276 nfsrv_freeopenowner(struct nfsstate *stp, int cansleep, NFSPROC_T *p)
1277 {
1278         struct nfsstate *nstp, *tstp;
1279
1280         LIST_REMOVE(stp, ls_list);
1281         /*
1282          * Now, free all associated opens.
1283          */
1284         nstp = LIST_FIRST(&stp->ls_open);
1285         while (nstp != LIST_END(&stp->ls_open)) {
1286                 tstp = nstp;
1287                 nstp = LIST_NEXT(nstp, ls_list);
1288                 (void) nfsrv_freeopen(tstp, NULL, cansleep, p);
1289         }
1290         if (stp->ls_op)
1291                 nfsrvd_derefcache(stp->ls_op);
1292         FREE((caddr_t)stp, M_NFSDSTATE);
1293         nfsstatsv1.srvopenowners--;
1294         nfsrv_openpluslock--;
1295 }
1296
1297 /*
1298  * This function frees an open (nfsstate open structure) with all associated
1299  * lock_owners and locks. It also frees the nfslockfile structure iff there
1300  * are no other opens on the file.
1301  * Returns 1 if it free'd the nfslockfile, 0 otherwise.
1302  */
1303 static int
1304 nfsrv_freeopen(struct nfsstate *stp, vnode_t vp, int cansleep, NFSPROC_T *p)
1305 {
1306         struct nfsstate *nstp, *tstp;
1307         struct nfslockfile *lfp;
1308         int ret;
1309
1310         LIST_REMOVE(stp, ls_hash);
1311         LIST_REMOVE(stp, ls_list);
1312         LIST_REMOVE(stp, ls_file);
1313
1314         lfp = stp->ls_lfp;
1315         /*
1316          * Now, free all lockowners associated with this open.
1317          */
1318         LIST_FOREACH_SAFE(tstp, &stp->ls_open, ls_list, nstp)
1319                 nfsrv_freelockowner(tstp, vp, cansleep, p);
1320
1321         /*
1322          * The nfslockfile is freed here if there are no locks
1323          * associated with the open.
1324          * If there are locks associated with the open, the
1325          * nfslockfile structure can be freed via nfsrv_freelockowner().
1326          * Acquire the state mutex to avoid races with calls to
1327          * nfsrv_getlockfile().
1328          */
1329         if (cansleep != 0)
1330                 NFSLOCKSTATE();
1331         if (lfp != NULL && LIST_EMPTY(&lfp->lf_open) &&
1332             LIST_EMPTY(&lfp->lf_deleg) && LIST_EMPTY(&lfp->lf_lock) &&
1333             LIST_EMPTY(&lfp->lf_locallock) && LIST_EMPTY(&lfp->lf_rollback) &&
1334             lfp->lf_usecount == 0 &&
1335             (cansleep != 0 || nfsv4_testlock(&lfp->lf_locallock_lck) == 0)) {
1336                 nfsrv_freenfslockfile(lfp);
1337                 ret = 1;
1338         } else
1339                 ret = 0;
1340         if (cansleep != 0)
1341                 NFSUNLOCKSTATE();
1342         FREE((caddr_t)stp, M_NFSDSTATE);
1343         nfsstatsv1.srvopens--;
1344         nfsrv_openpluslock--;
1345         return (ret);
1346 }
1347
1348 /*
1349  * Frees a lockowner and all associated locks.
1350  */
1351 static void
1352 nfsrv_freelockowner(struct nfsstate *stp, vnode_t vp, int cansleep,
1353     NFSPROC_T *p)
1354 {
1355
1356         LIST_REMOVE(stp, ls_hash);
1357         LIST_REMOVE(stp, ls_list);
1358         nfsrv_freeallnfslocks(stp, vp, cansleep, p);
1359         if (stp->ls_op)
1360                 nfsrvd_derefcache(stp->ls_op);
1361         FREE((caddr_t)stp, M_NFSDSTATE);
1362         nfsstatsv1.srvlockowners--;
1363         nfsrv_openpluslock--;
1364 }
1365
1366 /*
1367  * Free all the nfs locks on a lockowner.
1368  */
1369 static void
1370 nfsrv_freeallnfslocks(struct nfsstate *stp, vnode_t vp, int cansleep,
1371     NFSPROC_T *p)
1372 {
1373         struct nfslock *lop, *nlop;
1374         struct nfsrollback *rlp, *nrlp;
1375         struct nfslockfile *lfp = NULL;
1376         int gottvp = 0;
1377         vnode_t tvp = NULL;
1378         uint64_t first, end;
1379
1380         if (vp != NULL)
1381                 ASSERT_VOP_UNLOCKED(vp, "nfsrv_freeallnfslocks: vnode locked");
1382         lop = LIST_FIRST(&stp->ls_lock);
1383         while (lop != LIST_END(&stp->ls_lock)) {
1384                 nlop = LIST_NEXT(lop, lo_lckowner);
1385                 /*
1386                  * Since all locks should be for the same file, lfp should
1387                  * not change.
1388                  */
1389                 if (lfp == NULL)
1390                         lfp = lop->lo_lfp;
1391                 else if (lfp != lop->lo_lfp)
1392                         panic("allnfslocks");
1393                 /*
1394                  * If vp is NULL and cansleep != 0, a vnode must be acquired
1395                  * from the file handle. This only occurs when called from
1396                  * nfsrv_cleanclient().
1397                  */
1398                 if (gottvp == 0) {
1399                         if (nfsrv_dolocallocks == 0)
1400                                 tvp = NULL;
1401                         else if (vp == NULL && cansleep != 0) {
1402                                 tvp = nfsvno_getvp(&lfp->lf_fh);
1403                                 NFSVOPUNLOCK(tvp, 0);
1404                         } else
1405                                 tvp = vp;
1406                         gottvp = 1;
1407                 }
1408
1409                 if (tvp != NULL) {
1410                         if (cansleep == 0)
1411                                 panic("allnfs2");
1412                         first = lop->lo_first;
1413                         end = lop->lo_end;
1414                         nfsrv_freenfslock(lop);
1415                         nfsrv_localunlock(tvp, lfp, first, end, p);
1416                         LIST_FOREACH_SAFE(rlp, &lfp->lf_rollback, rlck_list,
1417                             nrlp)
1418                                 free(rlp, M_NFSDROLLBACK);
1419                         LIST_INIT(&lfp->lf_rollback);
1420                 } else
1421                         nfsrv_freenfslock(lop);
1422                 lop = nlop;
1423         }
1424         if (vp == NULL && tvp != NULL)
1425                 vrele(tvp);
1426 }
1427
1428 /*
1429  * Free an nfslock structure.
1430  */
1431 static void
1432 nfsrv_freenfslock(struct nfslock *lop)
1433 {
1434
1435         if (lop->lo_lckfile.le_prev != NULL) {
1436                 LIST_REMOVE(lop, lo_lckfile);
1437                 nfsstatsv1.srvlocks--;
1438                 nfsrv_openpluslock--;
1439         }
1440         LIST_REMOVE(lop, lo_lckowner);
1441         FREE((caddr_t)lop, M_NFSDLOCK);
1442 }
1443
1444 /*
1445  * This function frees an nfslockfile structure.
1446  */
1447 static void
1448 nfsrv_freenfslockfile(struct nfslockfile *lfp)
1449 {
1450
1451         LIST_REMOVE(lfp, lf_hash);
1452         FREE((caddr_t)lfp, M_NFSDLOCKFILE);
1453 }
1454
1455 /*
1456  * This function looks up an nfsstate structure via stateid.
1457  */
1458 static int
1459 nfsrv_getstate(struct nfsclient *clp, nfsv4stateid_t *stateidp, __unused u_int32_t flags,
1460     struct nfsstate **stpp)
1461 {
1462         struct nfsstate *stp;
1463         struct nfsstatehead *hp;
1464         int error = 0;
1465
1466         *stpp = NULL;
1467         hp = NFSSTATEHASH(clp, *stateidp);
1468         LIST_FOREACH(stp, hp, ls_hash) {
1469                 if (!NFSBCMP(stp->ls_stateid.other, stateidp->other,
1470                         NFSX_STATEIDOTHER))
1471                         break;
1472         }
1473
1474         /*
1475          * If no state id in list, return NFSERR_BADSTATEID.
1476          */
1477         if (stp == LIST_END(hp)) {
1478                 error = NFSERR_BADSTATEID;
1479                 goto out;
1480         }
1481         *stpp = stp;
1482
1483 out:
1484         NFSEXITCODE(error);
1485         return (error);
1486 }
1487
1488 /*
1489  * This function gets an nfsstate structure via owner string.
1490  */
1491 static void
1492 nfsrv_getowner(struct nfsstatehead *hp, struct nfsstate *new_stp,
1493     struct nfsstate **stpp)
1494 {
1495         struct nfsstate *stp;
1496
1497         *stpp = NULL;
1498         LIST_FOREACH(stp, hp, ls_list) {
1499                 if (new_stp->ls_ownerlen == stp->ls_ownerlen &&
1500                   !NFSBCMP(new_stp->ls_owner,stp->ls_owner,stp->ls_ownerlen)) {
1501                         *stpp = stp;
1502                         return;
1503                 }
1504         }
1505 }
1506
1507 /*
1508  * Lock control function called to update lock status.
1509  * Returns 0 upon success, -1 if there is no lock and the flags indicate
1510  * that one isn't to be created and an NFSERR_xxx for other errors.
1511  * The structures new_stp and new_lop are passed in as pointers that should
1512  * be set to NULL if the structure is used and shouldn't be free'd.
1513  * For the NFSLCK_TEST and NFSLCK_CHECK cases, the structures are
1514  * never used and can safely be allocated on the stack. For all other
1515  * cases, *new_stpp and *new_lopp should be malloc'd before the call,
1516  * in case they are used.
1517  */
1518 APPLESTATIC int
1519 nfsrv_lockctrl(vnode_t vp, struct nfsstate **new_stpp,
1520     struct nfslock **new_lopp, struct nfslockconflict *cfp,
1521     nfsquad_t clientid, nfsv4stateid_t *stateidp,
1522     __unused struct nfsexstuff *exp,
1523     struct nfsrv_descript *nd, NFSPROC_T *p)
1524 {
1525         struct nfslock *lop;
1526         struct nfsstate *new_stp = *new_stpp;
1527         struct nfslock *new_lop = *new_lopp;
1528         struct nfsstate *tstp, *mystp, *nstp;
1529         int specialid = 0;
1530         struct nfslockfile *lfp;
1531         struct nfslock *other_lop = NULL;
1532         struct nfsstate *stp, *lckstp = NULL;
1533         struct nfsclient *clp = NULL;
1534         u_int32_t bits;
1535         int error = 0, haslock = 0, ret, reterr;
1536         int getlckret, delegation = 0, filestruct_locked, vnode_unlocked = 0;
1537         fhandle_t nfh;
1538         uint64_t first, end;
1539         uint32_t lock_flags;
1540
1541         if (new_stp->ls_flags & (NFSLCK_CHECK | NFSLCK_SETATTR)) {
1542                 /*
1543                  * Note the special cases of "all 1s" or "all 0s" stateids and
1544                  * let reads with all 1s go ahead.
1545                  */
1546                 if (new_stp->ls_stateid.seqid == 0x0 &&
1547                     new_stp->ls_stateid.other[0] == 0x0 &&
1548                     new_stp->ls_stateid.other[1] == 0x0 &&
1549                     new_stp->ls_stateid.other[2] == 0x0)
1550                         specialid = 1;
1551                 else if (new_stp->ls_stateid.seqid == 0xffffffff &&
1552                     new_stp->ls_stateid.other[0] == 0xffffffff &&
1553                     new_stp->ls_stateid.other[1] == 0xffffffff &&
1554                     new_stp->ls_stateid.other[2] == 0xffffffff)
1555                         specialid = 2;
1556         }
1557
1558         /*
1559          * Check for restart conditions (client and server).
1560          */
1561         error = nfsrv_checkrestart(clientid, new_stp->ls_flags,
1562             &new_stp->ls_stateid, specialid);
1563         if (error)
1564                 goto out;
1565
1566         /*
1567          * Check for state resource limit exceeded.
1568          */
1569         if ((new_stp->ls_flags & NFSLCK_LOCK) &&
1570             nfsrv_openpluslock > nfsrv_v4statelimit) {
1571                 error = NFSERR_RESOURCE;
1572                 goto out;
1573         }
1574
1575         /*
1576          * For the lock case, get another nfslock structure,
1577          * just in case we need it.
1578          * Malloc now, before we start sifting through the linked lists,
1579          * in case we have to wait for memory.
1580          */
1581 tryagain:
1582         if (new_stp->ls_flags & NFSLCK_LOCK)
1583                 MALLOC(other_lop, struct nfslock *, sizeof (struct nfslock),
1584                     M_NFSDLOCK, M_WAITOK);
1585         filestruct_locked = 0;
1586         reterr = 0;
1587         lfp = NULL;
1588
1589         /*
1590          * Get the lockfile structure for CFH now, so we can do a sanity
1591          * check against the stateid, before incrementing the seqid#, since
1592          * we want to return NFSERR_BADSTATEID on failure and the seqid#
1593          * shouldn't be incremented for this case.
1594          * If nfsrv_getlockfile() returns -1, it means "not found", which
1595          * will be handled later.
1596          * If we are doing Lock/LockU and local locking is enabled, sleep
1597          * lock the nfslockfile structure.
1598          */
1599         getlckret = nfsrv_getlockfh(vp, new_stp->ls_flags, NULL, &nfh, p);
1600         NFSLOCKSTATE();
1601         if (getlckret == 0) {
1602                 if ((new_stp->ls_flags & (NFSLCK_LOCK | NFSLCK_UNLOCK)) != 0 &&
1603                     nfsrv_dolocallocks != 0 && nd->nd_repstat == 0) {
1604                         getlckret = nfsrv_getlockfile(new_stp->ls_flags, NULL,
1605                             &lfp, &nfh, 1);
1606                         if (getlckret == 0)
1607                                 filestruct_locked = 1;
1608                 } else
1609                         getlckret = nfsrv_getlockfile(new_stp->ls_flags, NULL,
1610                             &lfp, &nfh, 0);
1611         }
1612         if (getlckret != 0 && getlckret != -1)
1613                 reterr = getlckret;
1614
1615         if (filestruct_locked != 0) {
1616                 LIST_INIT(&lfp->lf_rollback);
1617                 if ((new_stp->ls_flags & NFSLCK_LOCK)) {
1618                         /*
1619                          * For local locking, do the advisory locking now, so
1620                          * that any conflict can be detected. A failure later
1621                          * can be rolled back locally. If an error is returned,
1622                          * struct nfslockfile has been unlocked and any local
1623                          * locking rolled back.
1624                          */
1625                         NFSUNLOCKSTATE();
1626                         if (vnode_unlocked == 0) {
1627                                 ASSERT_VOP_ELOCKED(vp, "nfsrv_lockctrl1");
1628                                 vnode_unlocked = 1;
1629                                 NFSVOPUNLOCK(vp, 0);
1630                         }
1631                         reterr = nfsrv_locallock(vp, lfp,
1632                             (new_lop->lo_flags & (NFSLCK_READ | NFSLCK_WRITE)),
1633                             new_lop->lo_first, new_lop->lo_end, cfp, p);
1634                         NFSLOCKSTATE();
1635                 }
1636         }
1637
1638         if (specialid == 0) {
1639             if (new_stp->ls_flags & NFSLCK_TEST) {
1640                 /*
1641                  * RFC 3530 does not list LockT as an op that renews a
1642                  * lease, but the consensus seems to be that it is ok
1643                  * for a server to do so.
1644                  */
1645                 error = nfsrv_getclient(clientid, CLOPS_RENEW, &clp, NULL,
1646                     (nfsquad_t)((u_quad_t)0), 0, nd, p);
1647
1648                 /*
1649                  * Since NFSERR_EXPIRED, NFSERR_ADMINREVOKED are not valid
1650                  * error returns for LockT, just go ahead and test for a lock,
1651                  * since there are no locks for this client, but other locks
1652                  * can conflict. (ie. same client will always be false)
1653                  */
1654                 if (error == NFSERR_EXPIRED || error == NFSERR_ADMINREVOKED)
1655                     error = 0;
1656                 lckstp = new_stp;
1657             } else {
1658               error = nfsrv_getclient(clientid, CLOPS_RENEW, &clp, NULL,
1659                 (nfsquad_t)((u_quad_t)0), 0, nd, p);
1660               if (error == 0)
1661                 /*
1662                  * Look up the stateid
1663                  */
1664                 error = nfsrv_getstate(clp, &new_stp->ls_stateid,
1665                   new_stp->ls_flags, &stp);
1666               /*
1667                * do some sanity checks for an unconfirmed open or a
1668                * stateid that refers to the wrong file, for an open stateid
1669                */
1670               if (error == 0 && (stp->ls_flags & NFSLCK_OPEN) &&
1671                   ((stp->ls_openowner->ls_flags & NFSLCK_NEEDSCONFIRM) ||
1672                    (getlckret == 0 && stp->ls_lfp != lfp))){
1673                       /*
1674                        * NFSLCK_SETATTR should return OK rather than NFSERR_BADSTATEID
1675                        * The only exception is using SETATTR with SIZE.
1676                        * */
1677                     if ((new_stp->ls_flags &
1678                          (NFSLCK_SETATTR | NFSLCK_CHECK)) != NFSLCK_SETATTR)
1679                              error = NFSERR_BADSTATEID;
1680               }
1681
1682                 if (error == 0 &&
1683                   (stp->ls_flags & (NFSLCK_DELEGREAD | NFSLCK_DELEGWRITE)) &&
1684                   getlckret == 0 && stp->ls_lfp != lfp)
1685                         error = NFSERR_BADSTATEID;
1686
1687               /*
1688                * If the lockowner stateid doesn't refer to the same file,
1689                * I believe that is considered ok, since some clients will
1690                * only create a single lockowner and use that for all locks
1691                * on all files.
1692                * For now, log it as a diagnostic, instead of considering it
1693                * a BadStateid.
1694                */
1695               if (error == 0 && (stp->ls_flags &
1696                   (NFSLCK_OPEN | NFSLCK_DELEGREAD | NFSLCK_DELEGWRITE)) == 0 &&
1697                   getlckret == 0 && stp->ls_lfp != lfp) {
1698 #ifdef DIAGNOSTIC
1699                   printf("Got a lock statid for different file open\n");
1700 #endif
1701                   /*
1702                   error = NFSERR_BADSTATEID;
1703                   */
1704               }
1705
1706               if (error == 0) {
1707                     if (new_stp->ls_flags & NFSLCK_OPENTOLOCK) {
1708                         /*
1709                          * If haslock set, we've already checked the seqid.
1710                          */
1711                         if (!haslock) {
1712                             if (stp->ls_flags & NFSLCK_OPEN)
1713                                 error = nfsrv_checkseqid(nd, new_stp->ls_seq,
1714                                     stp->ls_openowner, new_stp->ls_op);
1715                             else
1716                                 error = NFSERR_BADSTATEID;
1717                         }
1718                         if (!error)
1719                             nfsrv_getowner(&stp->ls_open, new_stp, &lckstp);
1720                         if (lckstp)
1721                             /*
1722                              * I believe this should be an error, but it
1723                              * isn't obvious what NFSERR_xxx would be
1724                              * appropriate, so I'll use NFSERR_INVAL for now.
1725                              */
1726                             error = NFSERR_INVAL;
1727                         else
1728                             lckstp = new_stp;
1729                     } else if (new_stp->ls_flags&(NFSLCK_LOCK|NFSLCK_UNLOCK)) {
1730                         /*
1731                          * If haslock set, ditto above.
1732                          */
1733                         if (!haslock) {
1734                             if (stp->ls_flags & NFSLCK_OPEN)
1735                                 error = NFSERR_BADSTATEID;
1736                             else
1737                                 error = nfsrv_checkseqid(nd, new_stp->ls_seq,
1738                                     stp, new_stp->ls_op);
1739                         }
1740                         lckstp = stp;
1741                     } else {
1742                         lckstp = stp;
1743                     }
1744               }
1745               /*
1746                * If the seqid part of the stateid isn't the same, return
1747                * NFSERR_OLDSTATEID for cases other than I/O Ops.
1748                * For I/O Ops, only return NFSERR_OLDSTATEID if
1749                * nfsrv_returnoldstateid is set. (The consensus on the email
1750                * list was that most clients would prefer to not receive
1751                * NFSERR_OLDSTATEID for I/O Ops, but the RFC suggests that that
1752                * is what will happen, so I use the nfsrv_returnoldstateid to
1753                * allow for either server configuration.)
1754                */
1755               if (!error && stp->ls_stateid.seqid!=new_stp->ls_stateid.seqid &&
1756                   (((nd->nd_flag & ND_NFSV41) == 0 &&
1757                    (!(new_stp->ls_flags & NFSLCK_CHECK) ||
1758                     nfsrv_returnoldstateid)) ||
1759                    ((nd->nd_flag & ND_NFSV41) != 0 &&
1760                     new_stp->ls_stateid.seqid != 0)))
1761                     error = NFSERR_OLDSTATEID;
1762             }
1763         }
1764
1765         /*
1766          * Now we can check for grace.
1767          */
1768         if (!error)
1769                 error = nfsrv_checkgrace(nd, clp, new_stp->ls_flags);
1770         if ((new_stp->ls_flags & NFSLCK_RECLAIM) && !error &&
1771                 nfsrv_checkstable(clp))
1772                 error = NFSERR_NOGRACE;
1773         /*
1774          * If we successfully Reclaimed state, note that.
1775          */
1776         if ((new_stp->ls_flags & NFSLCK_RECLAIM) && !error)
1777                 nfsrv_markstable(clp);
1778
1779         /*
1780          * At this point, either error == NFSERR_BADSTATEID or the
1781          * seqid# has been updated, so we can return any error.
1782          * If error == 0, there may be an error in:
1783          *    nd_repstat - Set by the calling function.
1784          *    reterr - Set above, if getting the nfslockfile structure
1785          *       or acquiring the local lock failed.
1786          *    (If both of these are set, nd_repstat should probably be
1787          *     returned, since that error was detected before this
1788          *     function call.)
1789          */
1790         if (error != 0 || nd->nd_repstat != 0 || reterr != 0) {
1791                 if (error == 0) {
1792                         if (nd->nd_repstat != 0)
1793                                 error = nd->nd_repstat;
1794                         else
1795                                 error = reterr;
1796                 }
1797                 if (filestruct_locked != 0) {
1798                         /* Roll back local locks. */
1799                         NFSUNLOCKSTATE();
1800                         if (vnode_unlocked == 0) {
1801                                 ASSERT_VOP_ELOCKED(vp, "nfsrv_lockctrl2");
1802                                 vnode_unlocked = 1;
1803                                 NFSVOPUNLOCK(vp, 0);
1804                         }
1805                         nfsrv_locallock_rollback(vp, lfp, p);
1806                         NFSLOCKSTATE();
1807                         nfsrv_unlocklf(lfp);
1808                 }
1809                 NFSUNLOCKSTATE();
1810                 goto out;
1811         }
1812
1813         /*
1814          * Check the nfsrv_getlockfile return.
1815          * Returned -1 if no structure found.
1816          */
1817         if (getlckret == -1) {
1818                 error = NFSERR_EXPIRED;
1819                 /*
1820                  * Called from lockt, so no lock is OK.
1821                  */
1822                 if (new_stp->ls_flags & NFSLCK_TEST) {
1823                         error = 0;
1824                 } else if (new_stp->ls_flags &
1825                     (NFSLCK_CHECK | NFSLCK_SETATTR)) {
1826                         /*
1827                          * Called to check for a lock, OK if the stateid is all
1828                          * 1s or all 0s, but there should be an nfsstate
1829                          * otherwise.
1830                          * (ie. If there is no open, I'll assume no share
1831                          *  deny bits.)
1832                          */
1833                         if (specialid)
1834                                 error = 0;
1835                         else
1836                                 error = NFSERR_BADSTATEID;
1837                 }
1838                 NFSUNLOCKSTATE();
1839                 goto out;
1840         }
1841
1842         /*
1843          * For NFSLCK_CHECK and NFSLCK_LOCK, test for a share conflict.
1844          * For NFSLCK_CHECK, allow a read if write access is granted,
1845          * but check for a deny. For NFSLCK_LOCK, require correct access,
1846          * which implies a conflicting deny can't exist.
1847          */
1848         if (new_stp->ls_flags & (NFSLCK_CHECK | NFSLCK_LOCK)) {
1849             /*
1850              * Four kinds of state id:
1851              * - specialid (all 0s or all 1s), only for NFSLCK_CHECK
1852              * - stateid for an open
1853              * - stateid for a delegation
1854              * - stateid for a lock owner
1855              */
1856             if (!specialid) {
1857                 if (stp->ls_flags & (NFSLCK_DELEGREAD | NFSLCK_DELEGWRITE)) {
1858                     delegation = 1;
1859                     mystp = stp;
1860                     nfsrv_delaydelegtimeout(stp);
1861                 } else if (stp->ls_flags & NFSLCK_OPEN) {
1862                     mystp = stp;
1863                 } else {
1864                     mystp = stp->ls_openstp;
1865                 }
1866                 /*
1867                  * If locking or checking, require correct access
1868                  * bit set.
1869                  */
1870                 if (((new_stp->ls_flags & NFSLCK_LOCK) &&
1871                      !((new_lop->lo_flags >> NFSLCK_LOCKSHIFT) &
1872                        mystp->ls_flags & NFSLCK_ACCESSBITS)) ||
1873                     ((new_stp->ls_flags & (NFSLCK_CHECK|NFSLCK_READACCESS)) ==
1874                       (NFSLCK_CHECK | NFSLCK_READACCESS) &&
1875                      !(mystp->ls_flags & NFSLCK_READACCESS)) ||
1876                     ((new_stp->ls_flags & (NFSLCK_CHECK|NFSLCK_WRITEACCESS)) ==
1877                       (NFSLCK_CHECK | NFSLCK_WRITEACCESS) &&
1878                      !(mystp->ls_flags & NFSLCK_WRITEACCESS))) {
1879                         if (filestruct_locked != 0) {
1880                                 /* Roll back local locks. */
1881                                 NFSUNLOCKSTATE();
1882                                 if (vnode_unlocked == 0) {
1883                                         ASSERT_VOP_ELOCKED(vp,
1884                                             "nfsrv_lockctrl3");
1885                                         vnode_unlocked = 1;
1886                                         NFSVOPUNLOCK(vp, 0);
1887                                 }
1888                                 nfsrv_locallock_rollback(vp, lfp, p);
1889                                 NFSLOCKSTATE();
1890                                 nfsrv_unlocklf(lfp);
1891                         }
1892                         NFSUNLOCKSTATE();
1893                         error = NFSERR_OPENMODE;
1894                         goto out;
1895                 }
1896             } else
1897                 mystp = NULL;
1898             if ((new_stp->ls_flags & NFSLCK_CHECK) && !delegation) {
1899                 /*
1900                  * Check for a conflicting deny bit.
1901                  */
1902                 LIST_FOREACH(tstp, &lfp->lf_open, ls_file) {
1903                     if (tstp != mystp) {
1904                         bits = tstp->ls_flags;
1905                         bits >>= NFSLCK_SHIFT;
1906                         if (new_stp->ls_flags & bits & NFSLCK_ACCESSBITS) {
1907                             KASSERT(vnode_unlocked == 0,
1908                                 ("nfsrv_lockctrl: vnode unlocked1"));
1909                             ret = nfsrv_clientconflict(tstp->ls_clp, &haslock,
1910                                 vp, p);
1911                             if (ret == 1) {
1912                                 /*
1913                                 * nfsrv_clientconflict unlocks state
1914                                  * when it returns non-zero.
1915                                  */
1916                                 lckstp = NULL;
1917                                 goto tryagain;
1918                             }
1919                             if (ret == 0)
1920                                 NFSUNLOCKSTATE();
1921                             if (ret == 2)
1922                                 error = NFSERR_PERM;
1923                             else
1924                                 error = NFSERR_OPENMODE;
1925                             goto out;
1926                         }
1927                     }
1928                 }
1929
1930                 /* We're outta here */
1931                 NFSUNLOCKSTATE();
1932                 goto out;
1933             }
1934         }
1935
1936         /*
1937          * For setattr, just get rid of all the Delegations for other clients.
1938          */
1939         if (new_stp->ls_flags & NFSLCK_SETATTR) {
1940                 KASSERT(vnode_unlocked == 0,
1941                     ("nfsrv_lockctrl: vnode unlocked2"));
1942                 ret = nfsrv_cleandeleg(vp, lfp, clp, &haslock, p);
1943                 if (ret) {
1944                         /*
1945                          * nfsrv_cleandeleg() unlocks state when it
1946                          * returns non-zero.
1947                          */
1948                         if (ret == -1) {
1949                                 lckstp = NULL;
1950                                 goto tryagain;
1951                         }
1952                         error = ret;
1953                         goto out;
1954                 }
1955                 if (!(new_stp->ls_flags & NFSLCK_CHECK) ||
1956                     (LIST_EMPTY(&lfp->lf_open) && LIST_EMPTY(&lfp->lf_lock) &&
1957                      LIST_EMPTY(&lfp->lf_deleg))) {
1958                         NFSUNLOCKSTATE();
1959                         goto out;
1960                 }
1961         }
1962
1963         /*
1964          * Check for a conflicting delegation. If one is found, call
1965          * nfsrv_delegconflict() to handle it. If the v4root lock hasn't
1966          * been set yet, it will get the lock. Otherwise, it will recall
1967          * the delegation. Then, we try try again...
1968          * I currently believe the conflict algorithm to be:
1969          * For Lock Ops (Lock/LockT/LockU)
1970          * - there is a conflict iff a different client has a write delegation
1971          * For Reading (Read Op)
1972          * - there is a conflict iff a different client has a write delegation
1973          *   (the specialids are always a different client)
1974          * For Writing (Write/Setattr of size)
1975          * - there is a conflict if a different client has any delegation
1976          * - there is a conflict if the same client has a read delegation
1977          *   (I don't understand why this isn't allowed, but that seems to be
1978          *    the current consensus?)
1979          */
1980         tstp = LIST_FIRST(&lfp->lf_deleg);
1981         while (tstp != LIST_END(&lfp->lf_deleg)) {
1982             nstp = LIST_NEXT(tstp, ls_file);
1983             if ((((new_stp->ls_flags&(NFSLCK_LOCK|NFSLCK_UNLOCK|NFSLCK_TEST))||
1984                  ((new_stp->ls_flags & NFSLCK_CHECK) &&
1985                   (new_lop->lo_flags & NFSLCK_READ))) &&
1986                   clp != tstp->ls_clp &&
1987                  (tstp->ls_flags & NFSLCK_DELEGWRITE)) ||
1988                  ((new_stp->ls_flags & NFSLCK_CHECK) &&
1989                    (new_lop->lo_flags & NFSLCK_WRITE) &&
1990                   (clp != tstp->ls_clp ||
1991                    (tstp->ls_flags & NFSLCK_DELEGREAD)))) {
1992                 ret = 0;
1993                 if (filestruct_locked != 0) {
1994                         /* Roll back local locks. */
1995                         NFSUNLOCKSTATE();
1996                         if (vnode_unlocked == 0) {
1997                                 ASSERT_VOP_ELOCKED(vp, "nfsrv_lockctrl4");
1998                                 NFSVOPUNLOCK(vp, 0);
1999                         }
2000                         nfsrv_locallock_rollback(vp, lfp, p);
2001                         NFSLOCKSTATE();
2002                         nfsrv_unlocklf(lfp);
2003                         NFSUNLOCKSTATE();
2004                         NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
2005                         vnode_unlocked = 0;
2006                         if ((vp->v_iflag & VI_DOOMED) != 0)
2007                                 ret = NFSERR_SERVERFAULT;
2008                         NFSLOCKSTATE();
2009                 }
2010                 if (ret == 0)
2011                         ret = nfsrv_delegconflict(tstp, &haslock, p, vp);
2012                 if (ret) {
2013                     /*
2014                      * nfsrv_delegconflict unlocks state when it
2015                      * returns non-zero, which it always does.
2016                      */
2017                     if (other_lop) {
2018                         FREE((caddr_t)other_lop, M_NFSDLOCK);
2019                         other_lop = NULL;
2020                     }
2021                     if (ret == -1) {
2022                         lckstp = NULL;
2023                         goto tryagain;
2024                     }
2025                     error = ret;
2026                     goto out;
2027                 }
2028                 /* Never gets here. */
2029             }
2030             tstp = nstp;
2031         }
2032
2033         /*
2034          * Handle the unlock case by calling nfsrv_updatelock().
2035          * (Should I have done some access checking above for unlock? For now,
2036          *  just let it happen.)
2037          */
2038         if (new_stp->ls_flags & NFSLCK_UNLOCK) {
2039                 first = new_lop->lo_first;
2040                 end = new_lop->lo_end;
2041                 nfsrv_updatelock(stp, new_lopp, &other_lop, lfp);
2042                 stateidp->seqid = ++(stp->ls_stateid.seqid);
2043                 if ((nd->nd_flag & ND_NFSV41) != 0 && stateidp->seqid == 0)
2044                         stateidp->seqid = stp->ls_stateid.seqid = 1;
2045                 stateidp->other[0] = stp->ls_stateid.other[0];
2046                 stateidp->other[1] = stp->ls_stateid.other[1];
2047                 stateidp->other[2] = stp->ls_stateid.other[2];
2048                 if (filestruct_locked != 0) {
2049                         NFSUNLOCKSTATE();
2050                         if (vnode_unlocked == 0) {
2051                                 ASSERT_VOP_ELOCKED(vp, "nfsrv_lockctrl5");
2052                                 vnode_unlocked = 1;
2053                                 NFSVOPUNLOCK(vp, 0);
2054                         }
2055                         /* Update the local locks. */
2056                         nfsrv_localunlock(vp, lfp, first, end, p);
2057                         NFSLOCKSTATE();
2058                         nfsrv_unlocklf(lfp);
2059                 }
2060                 NFSUNLOCKSTATE();
2061                 goto out;
2062         }
2063
2064         /*
2065          * Search for a conflicting lock. A lock conflicts if:
2066          * - the lock range overlaps and
2067          * - at least one lock is a write lock and
2068          * - it is not owned by the same lock owner
2069          */
2070         if (!delegation) {
2071           LIST_FOREACH(lop, &lfp->lf_lock, lo_lckfile) {
2072             if (new_lop->lo_end > lop->lo_first &&
2073                 new_lop->lo_first < lop->lo_end &&
2074                 (new_lop->lo_flags == NFSLCK_WRITE ||
2075                  lop->lo_flags == NFSLCK_WRITE) &&
2076                 lckstp != lop->lo_stp &&
2077                 (clp != lop->lo_stp->ls_clp ||
2078                  lckstp->ls_ownerlen != lop->lo_stp->ls_ownerlen ||
2079                  NFSBCMP(lckstp->ls_owner, lop->lo_stp->ls_owner,
2080                     lckstp->ls_ownerlen))) {
2081                 if (other_lop) {
2082                     FREE((caddr_t)other_lop, M_NFSDLOCK);
2083                     other_lop = NULL;
2084                 }
2085                 if (vnode_unlocked != 0)
2086                     ret = nfsrv_clientconflict(lop->lo_stp->ls_clp, &haslock,
2087                         NULL, p);
2088                 else
2089                     ret = nfsrv_clientconflict(lop->lo_stp->ls_clp, &haslock,
2090                         vp, p);
2091                 if (ret == 1) {
2092                     if (filestruct_locked != 0) {
2093                         if (vnode_unlocked == 0) {
2094                                 ASSERT_VOP_ELOCKED(vp, "nfsrv_lockctrl6");
2095                                 NFSVOPUNLOCK(vp, 0);
2096                         }
2097                         /* Roll back local locks. */
2098                         nfsrv_locallock_rollback(vp, lfp, p);
2099                         NFSLOCKSTATE();
2100                         nfsrv_unlocklf(lfp);
2101                         NFSUNLOCKSTATE();
2102                         NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
2103                         vnode_unlocked = 0;
2104                         if ((vp->v_iflag & VI_DOOMED) != 0) {
2105                                 error = NFSERR_SERVERFAULT;
2106                                 goto out;
2107                         }
2108                     }
2109                     /*
2110                      * nfsrv_clientconflict() unlocks state when it
2111                      * returns non-zero.
2112                      */
2113                     lckstp = NULL;
2114                     goto tryagain;
2115                 }
2116                 /*
2117                  * Found a conflicting lock, so record the conflict and
2118                  * return the error.
2119                  */
2120                 if (cfp != NULL && ret == 0) {
2121                     cfp->cl_clientid.lval[0]=lop->lo_stp->ls_stateid.other[0];
2122                     cfp->cl_clientid.lval[1]=lop->lo_stp->ls_stateid.other[1];
2123                     cfp->cl_first = lop->lo_first;
2124                     cfp->cl_end = lop->lo_end;
2125                     cfp->cl_flags = lop->lo_flags;
2126                     cfp->cl_ownerlen = lop->lo_stp->ls_ownerlen;
2127                     NFSBCOPY(lop->lo_stp->ls_owner, cfp->cl_owner,
2128                         cfp->cl_ownerlen);
2129                 }
2130                 if (ret == 2)
2131                     error = NFSERR_PERM;
2132                 else if (new_stp->ls_flags & NFSLCK_RECLAIM)
2133                     error = NFSERR_RECLAIMCONFLICT;
2134                 else if (new_stp->ls_flags & NFSLCK_CHECK)
2135                     error = NFSERR_LOCKED;
2136                 else
2137                     error = NFSERR_DENIED;
2138                 if (filestruct_locked != 0 && ret == 0) {
2139                         /* Roll back local locks. */
2140                         NFSUNLOCKSTATE();
2141                         if (vnode_unlocked == 0) {
2142                                 ASSERT_VOP_ELOCKED(vp, "nfsrv_lockctrl7");
2143                                 vnode_unlocked = 1;
2144                                 NFSVOPUNLOCK(vp, 0);
2145                         }
2146                         nfsrv_locallock_rollback(vp, lfp, p);
2147                         NFSLOCKSTATE();
2148                         nfsrv_unlocklf(lfp);
2149                 }
2150                 if (ret == 0)
2151                         NFSUNLOCKSTATE();
2152                 goto out;
2153             }
2154           }
2155         }
2156
2157         /*
2158          * We only get here if there was no lock that conflicted.
2159          */
2160         if (new_stp->ls_flags & (NFSLCK_TEST | NFSLCK_CHECK)) {
2161                 NFSUNLOCKSTATE();
2162                 goto out;
2163         }
2164
2165         /*
2166          * We only get here when we are creating or modifying a lock.
2167          * There are two variants:
2168          * - exist_lock_owner where lock_owner exists
2169          * - open_to_lock_owner with new lock_owner
2170          */
2171         first = new_lop->lo_first;
2172         end = new_lop->lo_end;
2173         lock_flags = new_lop->lo_flags;
2174         if (!(new_stp->ls_flags & NFSLCK_OPENTOLOCK)) {
2175                 nfsrv_updatelock(lckstp, new_lopp, &other_lop, lfp);
2176                 stateidp->seqid = ++(lckstp->ls_stateid.seqid);
2177                 if ((nd->nd_flag & ND_NFSV41) != 0 && stateidp->seqid == 0)
2178                         stateidp->seqid = lckstp->ls_stateid.seqid = 1;
2179                 stateidp->other[0] = lckstp->ls_stateid.other[0];
2180                 stateidp->other[1] = lckstp->ls_stateid.other[1];
2181                 stateidp->other[2] = lckstp->ls_stateid.other[2];
2182         } else {
2183                 /*
2184                  * The new open_to_lock_owner case.
2185                  * Link the new nfsstate into the lists.
2186                  */
2187                 new_stp->ls_seq = new_stp->ls_opentolockseq;
2188                 nfsrvd_refcache(new_stp->ls_op);
2189                 stateidp->seqid = new_stp->ls_stateid.seqid = 1;
2190                 stateidp->other[0] = new_stp->ls_stateid.other[0] =
2191                     clp->lc_clientid.lval[0];
2192                 stateidp->other[1] = new_stp->ls_stateid.other[1] =
2193                     clp->lc_clientid.lval[1];
2194                 stateidp->other[2] = new_stp->ls_stateid.other[2] =
2195                     nfsrv_nextstateindex(clp);
2196                 new_stp->ls_clp = clp;
2197                 LIST_INIT(&new_stp->ls_lock);
2198                 new_stp->ls_openstp = stp;
2199                 new_stp->ls_lfp = lfp;
2200                 nfsrv_insertlock(new_lop, (struct nfslock *)new_stp, new_stp,
2201                     lfp);
2202                 LIST_INSERT_HEAD(NFSSTATEHASH(clp, new_stp->ls_stateid),
2203                     new_stp, ls_hash);
2204                 LIST_INSERT_HEAD(&stp->ls_open, new_stp, ls_list);
2205                 *new_lopp = NULL;
2206                 *new_stpp = NULL;
2207                 nfsstatsv1.srvlockowners++;
2208                 nfsrv_openpluslock++;
2209         }
2210         if (filestruct_locked != 0) {
2211                 NFSUNLOCKSTATE();
2212                 nfsrv_locallock_commit(lfp, lock_flags, first, end);
2213                 NFSLOCKSTATE();
2214                 nfsrv_unlocklf(lfp);
2215         }
2216         NFSUNLOCKSTATE();
2217
2218 out:
2219         if (haslock) {
2220                 NFSLOCKV4ROOTMUTEX();
2221                 nfsv4_unlock(&nfsv4rootfs_lock, 1);
2222                 NFSUNLOCKV4ROOTMUTEX();
2223         }
2224         if (vnode_unlocked != 0) {
2225                 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
2226                 if (error == 0 && (vp->v_iflag & VI_DOOMED) != 0)
2227                         error = NFSERR_SERVERFAULT;
2228         }
2229         if (other_lop)
2230                 FREE((caddr_t)other_lop, M_NFSDLOCK);
2231         NFSEXITCODE2(error, nd);
2232         return (error);
2233 }
2234
2235 /*
2236  * Check for state errors for Open.
2237  * repstat is passed back out as an error if more critical errors
2238  * are not detected.
2239  */
2240 APPLESTATIC int
2241 nfsrv_opencheck(nfsquad_t clientid, nfsv4stateid_t *stateidp,
2242     struct nfsstate *new_stp, vnode_t vp, struct nfsrv_descript *nd,
2243     NFSPROC_T *p, int repstat)
2244 {
2245         struct nfsstate *stp, *nstp;
2246         struct nfsclient *clp;
2247         struct nfsstate *ownerstp;
2248         struct nfslockfile *lfp, *new_lfp;
2249         int error = 0, haslock = 0, ret, readonly = 0, getfhret = 0;
2250
2251         if ((new_stp->ls_flags & NFSLCK_SHAREBITS) == NFSLCK_READACCESS)
2252                 readonly = 1;
2253         /*
2254          * Check for restart conditions (client and server).
2255          */
2256         error = nfsrv_checkrestart(clientid, new_stp->ls_flags,
2257                 &new_stp->ls_stateid, 0);
2258         if (error)
2259                 goto out;
2260
2261         /*
2262          * Check for state resource limit exceeded.
2263          * Technically this should be SMP protected, but the worst
2264          * case error is "out by one or two" on the count when it
2265          * returns NFSERR_RESOURCE and the limit is just a rather
2266          * arbitrary high water mark, so no harm is done.
2267          */
2268         if (nfsrv_openpluslock > nfsrv_v4statelimit) {
2269                 error = NFSERR_RESOURCE;
2270                 goto out;
2271         }
2272
2273 tryagain:
2274         MALLOC(new_lfp, struct nfslockfile *, sizeof (struct nfslockfile),
2275             M_NFSDLOCKFILE, M_WAITOK);
2276         if (vp)
2277                 getfhret = nfsrv_getlockfh(vp, new_stp->ls_flags, new_lfp,
2278                     NULL, p);
2279         NFSLOCKSTATE();
2280         /*
2281          * Get the nfsclient structure.
2282          */
2283         error = nfsrv_getclient(clientid, CLOPS_RENEW, &clp, NULL,
2284             (nfsquad_t)((u_quad_t)0), 0, nd, p);
2285
2286         /*
2287          * Look up the open owner. See if it needs confirmation and
2288          * check the seq#, as required.
2289          */
2290         if (!error)
2291                 nfsrv_getowner(&clp->lc_open, new_stp, &ownerstp);
2292
2293         if (!error && ownerstp) {
2294                 error = nfsrv_checkseqid(nd, new_stp->ls_seq, ownerstp,
2295                     new_stp->ls_op);
2296                 /*
2297                  * If the OpenOwner hasn't been confirmed, assume the
2298                  * old one was a replay and this one is ok.
2299                  * See: RFC3530 Sec. 14.2.18.
2300                  */
2301                 if (error == NFSERR_BADSEQID &&
2302                     (ownerstp->ls_flags & NFSLCK_NEEDSCONFIRM))
2303                         error = 0;
2304         }
2305
2306         /*
2307          * Check for grace.
2308          */
2309         if (!error)
2310                 error = nfsrv_checkgrace(nd, clp, new_stp->ls_flags);
2311         if ((new_stp->ls_flags & NFSLCK_RECLAIM) && !error &&
2312                 nfsrv_checkstable(clp))
2313                 error = NFSERR_NOGRACE;
2314
2315         /*
2316          * If none of the above errors occurred, let repstat be
2317          * returned.
2318          */
2319         if (repstat && !error)
2320                 error = repstat;
2321         if (error) {
2322                 NFSUNLOCKSTATE();
2323                 if (haslock) {
2324                         NFSLOCKV4ROOTMUTEX();
2325                         nfsv4_unlock(&nfsv4rootfs_lock, 1);
2326                         NFSUNLOCKV4ROOTMUTEX();
2327                 }
2328                 free((caddr_t)new_lfp, M_NFSDLOCKFILE);
2329                 goto out;
2330         }
2331
2332         /*
2333          * If vp == NULL, the file doesn't exist yet, so return ok.
2334          * (This always happens on the first pass, so haslock must be 0.)
2335          */
2336         if (vp == NULL) {
2337                 NFSUNLOCKSTATE();
2338                 FREE((caddr_t)new_lfp, M_NFSDLOCKFILE);
2339                 goto out;
2340         }
2341
2342         /*
2343          * Get the structure for the underlying file.
2344          */
2345         if (getfhret)
2346                 error = getfhret;
2347         else
2348                 error = nfsrv_getlockfile(new_stp->ls_flags, &new_lfp, &lfp,
2349                     NULL, 0);
2350         if (new_lfp)
2351                 FREE((caddr_t)new_lfp, M_NFSDLOCKFILE);
2352         if (error) {
2353                 NFSUNLOCKSTATE();
2354                 if (haslock) {
2355                         NFSLOCKV4ROOTMUTEX();
2356                         nfsv4_unlock(&nfsv4rootfs_lock, 1);
2357                         NFSUNLOCKV4ROOTMUTEX();
2358                 }
2359                 goto out;
2360         }
2361
2362         /*
2363          * Search for a conflicting open/share.
2364          */
2365         if (new_stp->ls_flags & NFSLCK_DELEGCUR) {
2366             /*
2367              * For Delegate_Cur, search for the matching Delegation,
2368              * which indicates no conflict.
2369              * An old delegation should have been recovered by the
2370              * client doing a Claim_DELEGATE_Prev, so I won't let
2371              * it match and return NFSERR_EXPIRED. Should I let it
2372              * match?
2373              */
2374             LIST_FOREACH(stp, &lfp->lf_deleg, ls_file) {
2375                 if (!(stp->ls_flags & NFSLCK_OLDDELEG) &&
2376                     (((nd->nd_flag & ND_NFSV41) != 0 &&
2377                     stateidp->seqid == 0) ||
2378                     stateidp->seqid == stp->ls_stateid.seqid) &&
2379                     !NFSBCMP(stateidp->other, stp->ls_stateid.other,
2380                           NFSX_STATEIDOTHER))
2381                         break;
2382             }
2383             if (stp == LIST_END(&lfp->lf_deleg) ||
2384                 ((new_stp->ls_flags & NFSLCK_WRITEACCESS) &&
2385                  (stp->ls_flags & NFSLCK_DELEGREAD))) {
2386                 NFSUNLOCKSTATE();
2387                 if (haslock) {
2388                         NFSLOCKV4ROOTMUTEX();
2389                         nfsv4_unlock(&nfsv4rootfs_lock, 1);
2390                         NFSUNLOCKV4ROOTMUTEX();
2391                 }
2392                 error = NFSERR_EXPIRED;
2393                 goto out;
2394             }
2395         }
2396
2397         /*
2398          * Check for access/deny bit conflicts. I check for the same
2399          * owner as well, in case the client didn't bother.
2400          */
2401         LIST_FOREACH(stp, &lfp->lf_open, ls_file) {
2402                 if (!(new_stp->ls_flags & NFSLCK_DELEGCUR) &&
2403                     (((new_stp->ls_flags & NFSLCK_ACCESSBITS) &
2404                       ((stp->ls_flags>>NFSLCK_SHIFT) & NFSLCK_ACCESSBITS))||
2405                      ((stp->ls_flags & NFSLCK_ACCESSBITS) &
2406                       ((new_stp->ls_flags>>NFSLCK_SHIFT)&NFSLCK_ACCESSBITS)))){
2407                         ret = nfsrv_clientconflict(stp->ls_clp,&haslock,vp,p);
2408                         if (ret == 1) {
2409                                 /*
2410                                  * nfsrv_clientconflict() unlocks
2411                                  * state when it returns non-zero.
2412                                  */
2413                                 goto tryagain;
2414                         }
2415                         if (ret == 2)
2416                                 error = NFSERR_PERM;
2417                         else if (new_stp->ls_flags & NFSLCK_RECLAIM)
2418                                 error = NFSERR_RECLAIMCONFLICT;
2419                         else
2420                                 error = NFSERR_SHAREDENIED;
2421                         if (ret == 0)
2422                                 NFSUNLOCKSTATE();
2423                         if (haslock) {
2424                                 NFSLOCKV4ROOTMUTEX();
2425                                 nfsv4_unlock(&nfsv4rootfs_lock, 1);
2426                                 NFSUNLOCKV4ROOTMUTEX();
2427                         }
2428                         goto out;
2429                 }
2430         }
2431
2432         /*
2433          * Check for a conflicting delegation. If one is found, call
2434          * nfsrv_delegconflict() to handle it. If the v4root lock hasn't
2435          * been set yet, it will get the lock. Otherwise, it will recall
2436          * the delegation. Then, we try try again...
2437          * (If NFSLCK_DELEGCUR is set, it has a delegation, so there
2438          *  isn't a conflict.)
2439          * I currently believe the conflict algorithm to be:
2440          * For Open with Read Access and Deny None
2441          * - there is a conflict iff a different client has a write delegation
2442          * For Open with other Write Access or any Deny except None
2443          * - there is a conflict if a different client has any delegation
2444          * - there is a conflict if the same client has a read delegation
2445          *   (The current consensus is that this last case should be
2446          *    considered a conflict since the client with a read delegation
2447          *    could have done an Open with ReadAccess and WriteDeny
2448          *    locally and then not have checked for the WriteDeny.)
2449          * Don't check for a Reclaim, since that will be dealt with
2450          * by nfsrv_openctrl().
2451          */
2452         if (!(new_stp->ls_flags &
2453                 (NFSLCK_DELEGPREV | NFSLCK_DELEGCUR | NFSLCK_RECLAIM))) {
2454             stp = LIST_FIRST(&lfp->lf_deleg);
2455             while (stp != LIST_END(&lfp->lf_deleg)) {
2456                 nstp = LIST_NEXT(stp, ls_file);
2457                 if ((readonly && stp->ls_clp != clp &&
2458                        (stp->ls_flags & NFSLCK_DELEGWRITE)) ||
2459                     (!readonly && (stp->ls_clp != clp ||
2460                          (stp->ls_flags & NFSLCK_DELEGREAD)))) {
2461                         ret = nfsrv_delegconflict(stp, &haslock, p, vp);
2462                         if (ret) {
2463                             /*
2464                              * nfsrv_delegconflict() unlocks state
2465                              * when it returns non-zero.
2466                              */
2467                             if (ret == -1)
2468                                 goto tryagain;
2469                             error = ret;
2470                             goto out;
2471                         }
2472                 }
2473                 stp = nstp;
2474             }
2475         }
2476         NFSUNLOCKSTATE();
2477         if (haslock) {
2478                 NFSLOCKV4ROOTMUTEX();
2479                 nfsv4_unlock(&nfsv4rootfs_lock, 1);
2480                 NFSUNLOCKV4ROOTMUTEX();
2481         }
2482
2483 out:
2484         NFSEXITCODE2(error, nd);
2485         return (error);
2486 }
2487
2488 /*
2489  * Open control function to create/update open state for an open.
2490  */
2491 APPLESTATIC int
2492 nfsrv_openctrl(struct nfsrv_descript *nd, vnode_t vp,
2493     struct nfsstate **new_stpp, nfsquad_t clientid, nfsv4stateid_t *stateidp,
2494     nfsv4stateid_t *delegstateidp, u_int32_t *rflagsp, struct nfsexstuff *exp,
2495     NFSPROC_T *p, u_quad_t filerev)
2496 {
2497         struct nfsstate *new_stp = *new_stpp;
2498         struct nfsstate *stp, *nstp;
2499         struct nfsstate *openstp = NULL, *new_open, *ownerstp, *new_deleg;
2500         struct nfslockfile *lfp, *new_lfp;
2501         struct nfsclient *clp;
2502         int error = 0, haslock = 0, ret, delegate = 1, writedeleg = 1;
2503         int readonly = 0, cbret = 1, getfhret = 0;
2504
2505         if ((new_stp->ls_flags & NFSLCK_SHAREBITS) == NFSLCK_READACCESS)
2506                 readonly = 1;
2507         /*
2508          * Check for restart conditions (client and server).
2509          * (Paranoia, should have been detected by nfsrv_opencheck().)
2510          * If an error does show up, return NFSERR_EXPIRED, since the
2511          * the seqid# has already been incremented.
2512          */
2513         error = nfsrv_checkrestart(clientid, new_stp->ls_flags,
2514             &new_stp->ls_stateid, 0);
2515         if (error) {
2516                 printf("Nfsd: openctrl unexpected restart err=%d\n",
2517                     error);
2518                 error = NFSERR_EXPIRED;
2519                 goto out;
2520         }
2521
2522 tryagain:
2523         MALLOC(new_lfp, struct nfslockfile *, sizeof (struct nfslockfile),
2524             M_NFSDLOCKFILE, M_WAITOK);
2525         MALLOC(new_open, struct nfsstate *, sizeof (struct nfsstate),
2526             M_NFSDSTATE, M_WAITOK);
2527         MALLOC(new_deleg, struct nfsstate *, sizeof (struct nfsstate),
2528             M_NFSDSTATE, M_WAITOK);
2529         getfhret = nfsrv_getlockfh(vp, new_stp->ls_flags, new_lfp,
2530             NULL, p);
2531         NFSLOCKSTATE();
2532         /*
2533          * Get the client structure. Since the linked lists could be changed
2534          * by other nfsd processes if this process does a tsleep(), one of
2535          * two things must be done.
2536          * 1 - don't tsleep()
2537          * or
2538          * 2 - get the nfsv4_lock() { indicated by haslock == 1 }
2539          *     before using the lists, since this lock stops the other
2540          *     nfsd. This should only be used for rare cases, since it
2541          *     essentially single threads the nfsd.
2542          *     At this time, it is only done for cases where the stable
2543          *     storage file must be written prior to completion of state
2544          *     expiration.
2545          */
2546         error = nfsrv_getclient(clientid, CLOPS_RENEW, &clp, NULL,
2547             (nfsquad_t)((u_quad_t)0), 0, nd, p);
2548         if (!error && (clp->lc_flags & LCL_NEEDSCBNULL) &&
2549             clp->lc_program) {
2550                 /*
2551                  * This happens on the first open for a client
2552                  * that supports callbacks.
2553                  */
2554                 NFSUNLOCKSTATE();
2555                 /*
2556                  * Although nfsrv_docallback() will sleep, clp won't
2557                  * go away, since they are only removed when the
2558                  * nfsv4_lock() has blocked the nfsd threads. The
2559                  * fields in clp can change, but having multiple
2560                  * threads do this Null callback RPC should be
2561                  * harmless.
2562                  */
2563                 cbret = nfsrv_docallback(clp, NFSV4PROC_CBNULL,
2564                     NULL, 0, NULL, NULL, NULL, p);
2565                 NFSLOCKSTATE();
2566                 clp->lc_flags &= ~LCL_NEEDSCBNULL;
2567                 if (!cbret)
2568                         clp->lc_flags |= LCL_CALLBACKSON;
2569         }
2570
2571         /*
2572          * Look up the open owner. See if it needs confirmation and
2573          * check the seq#, as required.
2574          */
2575         if (!error)
2576                 nfsrv_getowner(&clp->lc_open, new_stp, &ownerstp);
2577
2578         if (error) {
2579                 NFSUNLOCKSTATE();
2580                 printf("Nfsd: openctrl unexpected state err=%d\n",
2581                         error);
2582                 free((caddr_t)new_lfp, M_NFSDLOCKFILE);
2583                 free((caddr_t)new_open, M_NFSDSTATE);
2584                 free((caddr_t)new_deleg, M_NFSDSTATE);
2585                 if (haslock) {
2586                         NFSLOCKV4ROOTMUTEX();
2587                         nfsv4_unlock(&nfsv4rootfs_lock, 1);
2588                         NFSUNLOCKV4ROOTMUTEX();
2589                 }
2590                 error = NFSERR_EXPIRED;
2591                 goto out;
2592         }
2593
2594         if (new_stp->ls_flags & NFSLCK_RECLAIM)
2595                 nfsrv_markstable(clp);
2596
2597         /*
2598          * Get the structure for the underlying file.
2599          */
2600         if (getfhret)
2601                 error = getfhret;
2602         else
2603                 error = nfsrv_getlockfile(new_stp->ls_flags, &new_lfp, &lfp,
2604                     NULL, 0);
2605         if (new_lfp)
2606                 FREE((caddr_t)new_lfp, M_NFSDLOCKFILE);
2607         if (error) {
2608                 NFSUNLOCKSTATE();
2609                 printf("Nfsd openctrl unexpected getlockfile err=%d\n",
2610                     error);
2611                 free((caddr_t)new_open, M_NFSDSTATE);
2612                 free((caddr_t)new_deleg, M_NFSDSTATE);
2613                 if (haslock) {
2614                         NFSLOCKV4ROOTMUTEX();
2615                         nfsv4_unlock(&nfsv4rootfs_lock, 1);
2616                         NFSUNLOCKV4ROOTMUTEX();
2617                 }
2618                 goto out;
2619         }
2620
2621         /*
2622          * Search for a conflicting open/share.
2623          */
2624         if (new_stp->ls_flags & NFSLCK_DELEGCUR) {
2625             /*
2626              * For Delegate_Cur, search for the matching Delegation,
2627              * which indicates no conflict.
2628              * An old delegation should have been recovered by the
2629              * client doing a Claim_DELEGATE_Prev, so I won't let
2630              * it match and return NFSERR_EXPIRED. Should I let it
2631              * match?
2632              */
2633             LIST_FOREACH(stp, &lfp->lf_deleg, ls_file) {
2634                 if (!(stp->ls_flags & NFSLCK_OLDDELEG) &&
2635                     (((nd->nd_flag & ND_NFSV41) != 0 &&
2636                     stateidp->seqid == 0) ||
2637                     stateidp->seqid == stp->ls_stateid.seqid) &&
2638                     !NFSBCMP(stateidp->other, stp->ls_stateid.other,
2639                         NFSX_STATEIDOTHER))
2640                         break;
2641             }
2642             if (stp == LIST_END(&lfp->lf_deleg) ||
2643                 ((new_stp->ls_flags & NFSLCK_WRITEACCESS) &&
2644                  (stp->ls_flags & NFSLCK_DELEGREAD))) {
2645                 NFSUNLOCKSTATE();
2646                 printf("Nfsd openctrl unexpected expiry\n");
2647                 free((caddr_t)new_open, M_NFSDSTATE);
2648                 free((caddr_t)new_deleg, M_NFSDSTATE);
2649                 if (haslock) {
2650                         NFSLOCKV4ROOTMUTEX();
2651                         nfsv4_unlock(&nfsv4rootfs_lock, 1);
2652                         NFSUNLOCKV4ROOTMUTEX();
2653                 }
2654                 error = NFSERR_EXPIRED;
2655                 goto out;
2656             }
2657
2658             /*
2659              * Don't issue a Delegation, since one already exists and
2660              * delay delegation timeout, as required.
2661              */
2662             delegate = 0;
2663             nfsrv_delaydelegtimeout(stp);
2664         }
2665
2666         /*
2667          * Check for access/deny bit conflicts. I also check for the
2668          * same owner, since the client might not have bothered to check.
2669          * Also, note an open for the same file and owner, if found,
2670          * which is all we do here for Delegate_Cur, since conflict
2671          * checking is already done.
2672          */
2673         LIST_FOREACH(stp, &lfp->lf_open, ls_file) {
2674                 if (ownerstp && stp->ls_openowner == ownerstp)
2675                         openstp = stp;
2676                 if (!(new_stp->ls_flags & NFSLCK_DELEGCUR)) {
2677                     /*
2678                      * If another client has the file open, the only
2679                      * delegation that can be issued is a Read delegation
2680                      * and only if it is a Read open with Deny none.
2681                      */
2682                     if (clp != stp->ls_clp) {
2683                         if ((stp->ls_flags & NFSLCK_SHAREBITS) ==
2684                             NFSLCK_READACCESS)
2685                             writedeleg = 0;
2686                         else
2687                             delegate = 0;
2688                     }
2689                     if(((new_stp->ls_flags & NFSLCK_ACCESSBITS) &
2690                         ((stp->ls_flags>>NFSLCK_SHIFT) & NFSLCK_ACCESSBITS))||
2691                        ((stp->ls_flags & NFSLCK_ACCESSBITS) &
2692                         ((new_stp->ls_flags>>NFSLCK_SHIFT)&NFSLCK_ACCESSBITS))){
2693                         ret = nfsrv_clientconflict(stp->ls_clp,&haslock,vp,p);
2694                         if (ret == 1) {
2695                                 /*
2696                                  * nfsrv_clientconflict() unlocks state
2697                                  * when it returns non-zero.
2698                                  */
2699                                 free((caddr_t)new_open, M_NFSDSTATE);
2700                                 free((caddr_t)new_deleg, M_NFSDSTATE);
2701                                 openstp = NULL;
2702                                 goto tryagain;
2703                         }
2704                         if (ret == 2)
2705                                 error = NFSERR_PERM;
2706                         else if (new_stp->ls_flags & NFSLCK_RECLAIM)
2707                                 error = NFSERR_RECLAIMCONFLICT;
2708                         else
2709                                 error = NFSERR_SHAREDENIED;
2710                         if (ret == 0)
2711                                 NFSUNLOCKSTATE();
2712                         if (haslock) {
2713                                 NFSLOCKV4ROOTMUTEX();
2714                                 nfsv4_unlock(&nfsv4rootfs_lock, 1);
2715                                 NFSUNLOCKV4ROOTMUTEX();
2716                         }
2717                         free((caddr_t)new_open, M_NFSDSTATE);
2718                         free((caddr_t)new_deleg, M_NFSDSTATE);
2719                         printf("nfsd openctrl unexpected client cnfl\n");
2720                         goto out;
2721                     }
2722                 }
2723         }
2724
2725         /*
2726          * Check for a conflicting delegation. If one is found, call
2727          * nfsrv_delegconflict() to handle it. If the v4root lock hasn't
2728          * been set yet, it will get the lock. Otherwise, it will recall
2729          * the delegation. Then, we try try again...
2730          * (If NFSLCK_DELEGCUR is set, it has a delegation, so there
2731          *  isn't a conflict.)
2732          * I currently believe the conflict algorithm to be:
2733          * For Open with Read Access and Deny None
2734          * - there is a conflict iff a different client has a write delegation
2735          * For Open with other Write Access or any Deny except None
2736          * - there is a conflict if a different client has any delegation
2737          * - there is a conflict if the same client has a read delegation
2738          *   (The current consensus is that this last case should be
2739          *    considered a conflict since the client with a read delegation
2740          *    could have done an Open with ReadAccess and WriteDeny
2741          *    locally and then not have checked for the WriteDeny.)
2742          */
2743         if (!(new_stp->ls_flags & (NFSLCK_DELEGPREV | NFSLCK_DELEGCUR))) {
2744             stp = LIST_FIRST(&lfp->lf_deleg);
2745             while (stp != LIST_END(&lfp->lf_deleg)) {
2746                 nstp = LIST_NEXT(stp, ls_file);
2747                 if (stp->ls_clp != clp && (stp->ls_flags & NFSLCK_DELEGREAD))
2748                         writedeleg = 0;
2749                 else
2750                         delegate = 0;
2751                 if ((readonly && stp->ls_clp != clp &&
2752                        (stp->ls_flags & NFSLCK_DELEGWRITE)) ||
2753                     (!readonly && (stp->ls_clp != clp ||
2754                          (stp->ls_flags & NFSLCK_DELEGREAD)))) {
2755                     if (new_stp->ls_flags & NFSLCK_RECLAIM) {
2756                         delegate = 2;
2757                     } else {
2758                         ret = nfsrv_delegconflict(stp, &haslock, p, vp);
2759                         if (ret) {
2760                             /*
2761                              * nfsrv_delegconflict() unlocks state
2762                              * when it returns non-zero.
2763                              */
2764                             printf("Nfsd openctrl unexpected deleg cnfl\n");
2765                             free((caddr_t)new_open, M_NFSDSTATE);
2766                             free((caddr_t)new_deleg, M_NFSDSTATE);
2767                             if (ret == -1) {
2768                                 openstp = NULL;
2769                                 goto tryagain;
2770                             }
2771                             error = ret;
2772                             goto out;
2773                         }
2774                     }
2775                 }
2776                 stp = nstp;
2777             }
2778         }
2779
2780         /*
2781          * We only get here if there was no open that conflicted.
2782          * If an open for the owner exists, or in the access/deny bits.
2783          * Otherwise it is a new open. If the open_owner hasn't been
2784          * confirmed, replace the open with the new one needing confirmation,
2785          * otherwise add the open.
2786          */
2787         if (new_stp->ls_flags & NFSLCK_DELEGPREV) {
2788             /*
2789              * Handle NFSLCK_DELEGPREV by searching the old delegations for
2790              * a match. If found, just move the old delegation to the current
2791              * delegation list and issue open. If not found, return
2792              * NFSERR_EXPIRED.
2793              */
2794             LIST_FOREACH(stp, &clp->lc_olddeleg, ls_list) {
2795                 if (stp->ls_lfp == lfp) {
2796                     /* Found it */
2797                     if (stp->ls_clp != clp)
2798                         panic("olddeleg clp");
2799                     LIST_REMOVE(stp, ls_list);
2800                     LIST_REMOVE(stp, ls_hash);
2801                     stp->ls_flags &= ~NFSLCK_OLDDELEG;
2802                     stp->ls_stateid.seqid = delegstateidp->seqid = 1;
2803                     stp->ls_stateid.other[0] = delegstateidp->other[0] =
2804                         clp->lc_clientid.lval[0];
2805                     stp->ls_stateid.other[1] = delegstateidp->other[1] =
2806                         clp->lc_clientid.lval[1];
2807                     stp->ls_stateid.other[2] = delegstateidp->other[2] =
2808                         nfsrv_nextstateindex(clp);
2809                     stp->ls_compref = nd->nd_compref;
2810                     LIST_INSERT_HEAD(&clp->lc_deleg, stp, ls_list);
2811                     LIST_INSERT_HEAD(NFSSTATEHASH(clp,
2812                         stp->ls_stateid), stp, ls_hash);
2813                     if (stp->ls_flags & NFSLCK_DELEGWRITE)
2814                         *rflagsp |= NFSV4OPEN_WRITEDELEGATE;
2815                     else
2816                         *rflagsp |= NFSV4OPEN_READDELEGATE;
2817                     clp->lc_delegtime = NFSD_MONOSEC +
2818                         nfsrv_lease + NFSRV_LEASEDELTA;
2819
2820                     /*
2821                      * Now, do the associated open.
2822                      */
2823                     new_open->ls_stateid.seqid = 1;
2824                     new_open->ls_stateid.other[0] = clp->lc_clientid.lval[0];
2825                     new_open->ls_stateid.other[1] = clp->lc_clientid.lval[1];
2826                     new_open->ls_stateid.other[2] = nfsrv_nextstateindex(clp);
2827                     new_open->ls_flags = (new_stp->ls_flags&NFSLCK_DENYBITS)|
2828                         NFSLCK_OPEN;
2829                     if (stp->ls_flags & NFSLCK_DELEGWRITE)
2830                         new_open->ls_flags |= (NFSLCK_READACCESS |
2831                             NFSLCK_WRITEACCESS);
2832                     else
2833                         new_open->ls_flags |= NFSLCK_READACCESS;
2834                     new_open->ls_uid = new_stp->ls_uid;
2835                     new_open->ls_lfp = lfp;
2836                     new_open->ls_clp = clp;
2837                     LIST_INIT(&new_open->ls_open);
2838                     LIST_INSERT_HEAD(&lfp->lf_open, new_open, ls_file);
2839                     LIST_INSERT_HEAD(NFSSTATEHASH(clp, new_open->ls_stateid),
2840                         new_open, ls_hash);
2841                     /*
2842                      * and handle the open owner
2843                      */
2844                     if (ownerstp) {
2845                         new_open->ls_openowner = ownerstp;
2846                         LIST_INSERT_HEAD(&ownerstp->ls_open,new_open,ls_list);
2847                     } else {
2848                         new_open->ls_openowner = new_stp;
2849                         new_stp->ls_flags = 0;
2850                         nfsrvd_refcache(new_stp->ls_op);
2851                         new_stp->ls_noopens = 0;
2852                         LIST_INIT(&new_stp->ls_open);
2853                         LIST_INSERT_HEAD(&new_stp->ls_open, new_open, ls_list);
2854                         LIST_INSERT_HEAD(&clp->lc_open, new_stp, ls_list);
2855                         *new_stpp = NULL;
2856                         nfsstatsv1.srvopenowners++;
2857                         nfsrv_openpluslock++;
2858                     }
2859                     openstp = new_open;
2860                     new_open = NULL;
2861                     nfsstatsv1.srvopens++;
2862                     nfsrv_openpluslock++;
2863                     break;
2864                 }
2865             }
2866             if (stp == LIST_END(&clp->lc_olddeleg))
2867                 error = NFSERR_EXPIRED;
2868         } else if (new_stp->ls_flags & (NFSLCK_DELEGREAD | NFSLCK_DELEGWRITE)) {
2869             /*
2870              * Scan to see that no delegation for this client and file
2871              * doesn't already exist.
2872              * There also shouldn't yet be an Open for this file and
2873              * openowner.
2874              */
2875             LIST_FOREACH(stp, &lfp->lf_deleg, ls_file) {
2876                 if (stp->ls_clp == clp)
2877                     break;
2878             }
2879             if (stp == LIST_END(&lfp->lf_deleg) && openstp == NULL) {
2880                 /*
2881                  * This is the Claim_Previous case with a delegation
2882                  * type != Delegate_None.
2883                  */
2884                 /*
2885                  * First, add the delegation. (Although we must issue the
2886                  * delegation, we can also ask for an immediate return.)
2887                  */
2888                 new_deleg->ls_stateid.seqid = delegstateidp->seqid = 1;
2889                 new_deleg->ls_stateid.other[0] = delegstateidp->other[0] =
2890                     clp->lc_clientid.lval[0];
2891                 new_deleg->ls_stateid.other[1] = delegstateidp->other[1] =
2892                     clp->lc_clientid.lval[1];
2893                 new_deleg->ls_stateid.other[2] = delegstateidp->other[2] =
2894                     nfsrv_nextstateindex(clp);
2895                 if (new_stp->ls_flags & NFSLCK_DELEGWRITE) {
2896                     new_deleg->ls_flags = (NFSLCK_DELEGWRITE |
2897                         NFSLCK_READACCESS | NFSLCK_WRITEACCESS);
2898                     *rflagsp |= NFSV4OPEN_WRITEDELEGATE;
2899                 } else {
2900                     new_deleg->ls_flags = (NFSLCK_DELEGREAD |
2901                         NFSLCK_READACCESS);
2902                     *rflagsp |= NFSV4OPEN_READDELEGATE;
2903                 }
2904                 new_deleg->ls_uid = new_stp->ls_uid;
2905                 new_deleg->ls_lfp = lfp;
2906                 new_deleg->ls_clp = clp;
2907                 new_deleg->ls_filerev = filerev;
2908                 new_deleg->ls_compref = nd->nd_compref;
2909                 LIST_INSERT_HEAD(&lfp->lf_deleg, new_deleg, ls_file);
2910                 LIST_INSERT_HEAD(NFSSTATEHASH(clp,
2911                     new_deleg->ls_stateid), new_deleg, ls_hash);
2912                 LIST_INSERT_HEAD(&clp->lc_deleg, new_deleg, ls_list);
2913                 new_deleg = NULL;
2914                 if (delegate == 2 || nfsrv_issuedelegs == 0 ||
2915                     (clp->lc_flags & (LCL_CALLBACKSON | LCL_CBDOWN)) !=
2916                      LCL_CALLBACKSON ||
2917                     NFSRV_V4DELEGLIMIT(nfsrv_delegatecnt) ||
2918                     !NFSVNO_DELEGOK(vp))
2919                     *rflagsp |= NFSV4OPEN_RECALL;
2920                 nfsstatsv1.srvdelegates++;
2921                 nfsrv_openpluslock++;
2922                 nfsrv_delegatecnt++;
2923
2924                 /*
2925                  * Now, do the associated open.
2926                  */
2927                 new_open->ls_stateid.seqid = 1;
2928                 new_open->ls_stateid.other[0] = clp->lc_clientid.lval[0];
2929                 new_open->ls_stateid.other[1] = clp->lc_clientid.lval[1];
2930                 new_open->ls_stateid.other[2] = nfsrv_nextstateindex(clp);
2931                 new_open->ls_flags = (new_stp->ls_flags & NFSLCK_DENYBITS) |
2932                     NFSLCK_OPEN;
2933                 if (new_stp->ls_flags & NFSLCK_DELEGWRITE)
2934                         new_open->ls_flags |= (NFSLCK_READACCESS |
2935                             NFSLCK_WRITEACCESS);
2936                 else
2937                         new_open->ls_flags |= NFSLCK_READACCESS;
2938                 new_open->ls_uid = new_stp->ls_uid;
2939                 new_open->ls_lfp = lfp;
2940                 new_open->ls_clp = clp;
2941                 LIST_INIT(&new_open->ls_open);
2942                 LIST_INSERT_HEAD(&lfp->lf_open, new_open, ls_file);
2943                 LIST_INSERT_HEAD(NFSSTATEHASH(clp, new_open->ls_stateid),
2944                    new_open, ls_hash);
2945                 /*
2946                  * and handle the open owner
2947                  */
2948                 if (ownerstp) {
2949                     new_open->ls_openowner = ownerstp;
2950                     LIST_INSERT_HEAD(&ownerstp->ls_open, new_open, ls_list);
2951                 } else {
2952                     new_open->ls_openowner = new_stp;
2953                     new_stp->ls_flags = 0;
2954                     nfsrvd_refcache(new_stp->ls_op);
2955                     new_stp->ls_noopens = 0;
2956                     LIST_INIT(&new_stp->ls_open);
2957                     LIST_INSERT_HEAD(&new_stp->ls_open, new_open, ls_list);
2958                     LIST_INSERT_HEAD(&clp->lc_open, new_stp, ls_list);
2959                     *new_stpp = NULL;
2960                     nfsstatsv1.srvopenowners++;
2961                     nfsrv_openpluslock++;
2962                 }
2963                 openstp = new_open;
2964                 new_open = NULL;
2965                 nfsstatsv1.srvopens++;
2966                 nfsrv_openpluslock++;
2967             } else {
2968                 error = NFSERR_RECLAIMCONFLICT;
2969             }
2970         } else if (ownerstp) {
2971                 if (ownerstp->ls_flags & NFSLCK_NEEDSCONFIRM) {
2972                     /* Replace the open */
2973                     if (ownerstp->ls_op)
2974                         nfsrvd_derefcache(ownerstp->ls_op);
2975                     ownerstp->ls_op = new_stp->ls_op;
2976                     nfsrvd_refcache(ownerstp->ls_op);
2977                     ownerstp->ls_seq = new_stp->ls_seq;
2978                     *rflagsp |= NFSV4OPEN_RESULTCONFIRM;
2979                     stp = LIST_FIRST(&ownerstp->ls_open);
2980                     stp->ls_flags = (new_stp->ls_flags & NFSLCK_SHAREBITS) |
2981                         NFSLCK_OPEN;
2982                     stp->ls_stateid.seqid = 1;
2983                     stp->ls_uid = new_stp->ls_uid;
2984                     if (lfp != stp->ls_lfp) {
2985                         LIST_REMOVE(stp, ls_file);
2986                         LIST_INSERT_HEAD(&lfp->lf_open, stp, ls_file);
2987                         stp->ls_lfp = lfp;
2988                     }
2989                     openstp = stp;
2990                 } else if (openstp) {
2991                     openstp->ls_flags |= (new_stp->ls_flags & NFSLCK_SHAREBITS);
2992                     openstp->ls_stateid.seqid++;
2993                     if ((nd->nd_flag & ND_NFSV41) != 0 &&
2994                         openstp->ls_stateid.seqid == 0)
2995                         openstp->ls_stateid.seqid = 1;
2996
2997                     /*
2998                      * This is where we can choose to issue a delegation.
2999                      */
3000                     if (delegate == 0 || writedeleg == 0 ||
3001                         NFSVNO_EXRDONLY(exp) || (readonly != 0 &&
3002                         nfsrv_writedelegifpos == 0) ||
3003                         !NFSVNO_DELEGOK(vp) ||
3004                         (new_stp->ls_flags & NFSLCK_WANTRDELEG) != 0 ||
3005                         (clp->lc_flags & (LCL_CALLBACKSON | LCL_CBDOWN)) !=
3006                          LCL_CALLBACKSON)
3007                         *rflagsp |= NFSV4OPEN_WDCONTENTION;
3008                     else if (nfsrv_issuedelegs == 0 ||
3009                         NFSRV_V4DELEGLIMIT(nfsrv_delegatecnt))
3010                         *rflagsp |= NFSV4OPEN_WDRESOURCE;
3011                     else if ((new_stp->ls_flags & NFSLCK_WANTNODELEG) != 0)
3012                         *rflagsp |= NFSV4OPEN_WDNOTWANTED;
3013                     else {
3014                         new_deleg->ls_stateid.seqid = delegstateidp->seqid = 1;
3015                         new_deleg->ls_stateid.other[0] = delegstateidp->other[0]
3016                             = clp->lc_clientid.lval[0];
3017                         new_deleg->ls_stateid.other[1] = delegstateidp->other[1]
3018                             = clp->lc_clientid.lval[1];
3019                         new_deleg->ls_stateid.other[2] = delegstateidp->other[2]
3020                             = nfsrv_nextstateindex(clp);
3021                         new_deleg->ls_flags = (NFSLCK_DELEGWRITE |
3022                             NFSLCK_READACCESS | NFSLCK_WRITEACCESS);
3023                         *rflagsp |= NFSV4OPEN_WRITEDELEGATE;
3024                         new_deleg->ls_uid = new_stp->ls_uid;
3025                         new_deleg->ls_lfp = lfp;
3026                         new_deleg->ls_clp = clp;
3027                         new_deleg->ls_filerev = filerev;
3028                         new_deleg->ls_compref = nd->nd_compref;
3029                         LIST_INSERT_HEAD(&lfp->lf_deleg, new_deleg, ls_file);
3030                         LIST_INSERT_HEAD(NFSSTATEHASH(clp,
3031                             new_deleg->ls_stateid), new_deleg, ls_hash);
3032                         LIST_INSERT_HEAD(&clp->lc_deleg, new_deleg, ls_list);
3033                         new_deleg = NULL;
3034                         nfsstatsv1.srvdelegates++;
3035                         nfsrv_openpluslock++;
3036                         nfsrv_delegatecnt++;
3037                     }
3038                 } else {
3039                     new_open->ls_stateid.seqid = 1;
3040                     new_open->ls_stateid.other[0] = clp->lc_clientid.lval[0];
3041                     new_open->ls_stateid.other[1] = clp->lc_clientid.lval[1];
3042                     new_open->ls_stateid.other[2] = nfsrv_nextstateindex(clp);
3043                     new_open->ls_flags = (new_stp->ls_flags & NFSLCK_SHAREBITS)|
3044                         NFSLCK_OPEN;
3045                     new_open->ls_uid = new_stp->ls_uid;
3046                     new_open->ls_openowner = ownerstp;
3047                     new_open->ls_lfp = lfp;
3048                     new_open->ls_clp = clp;
3049                     LIST_INIT(&new_open->ls_open);
3050                     LIST_INSERT_HEAD(&lfp->lf_open, new_open, ls_file);
3051                     LIST_INSERT_HEAD(&ownerstp->ls_open, new_open, ls_list);
3052                     LIST_INSERT_HEAD(NFSSTATEHASH(clp, new_open->ls_stateid),
3053                         new_open, ls_hash);
3054                     openstp = new_open;
3055                     new_open = NULL;
3056                     nfsstatsv1.srvopens++;
3057                     nfsrv_openpluslock++;
3058
3059                     /*
3060                      * This is where we can choose to issue a delegation.
3061                      */
3062                     if (delegate == 0 || (writedeleg == 0 && readonly == 0) ||
3063                         !NFSVNO_DELEGOK(vp) ||
3064                         (clp->lc_flags & (LCL_CALLBACKSON | LCL_CBDOWN)) !=
3065                          LCL_CALLBACKSON)
3066                         *rflagsp |= NFSV4OPEN_WDCONTENTION;
3067                     else if (nfsrv_issuedelegs == 0 ||
3068                         NFSRV_V4DELEGLIMIT(nfsrv_delegatecnt))
3069                         *rflagsp |= NFSV4OPEN_WDRESOURCE;
3070                     else if ((new_stp->ls_flags & NFSLCK_WANTNODELEG) != 0)
3071                         *rflagsp |= NFSV4OPEN_WDNOTWANTED;
3072                     else {
3073                         new_deleg->ls_stateid.seqid = delegstateidp->seqid = 1;
3074                         new_deleg->ls_stateid.other[0] = delegstateidp->other[0]
3075                             = clp->lc_clientid.lval[0];
3076                         new_deleg->ls_stateid.other[1] = delegstateidp->other[1]
3077                             = clp->lc_clientid.lval[1];
3078                         new_deleg->ls_stateid.other[2] = delegstateidp->other[2]
3079                             = nfsrv_nextstateindex(clp);
3080                         if (writedeleg && !NFSVNO_EXRDONLY(exp) &&
3081                             (nfsrv_writedelegifpos || !readonly) &&
3082                             (new_stp->ls_flags & NFSLCK_WANTRDELEG) == 0) {
3083                             new_deleg->ls_flags = (NFSLCK_DELEGWRITE |
3084                                 NFSLCK_READACCESS | NFSLCK_WRITEACCESS);
3085                             *rflagsp |= NFSV4OPEN_WRITEDELEGATE;
3086                         } else {
3087                             new_deleg->ls_flags = (NFSLCK_DELEGREAD |
3088                                 NFSLCK_READACCESS);
3089                             *rflagsp |= NFSV4OPEN_READDELEGATE;
3090                         }
3091                         new_deleg->ls_uid = new_stp->ls_uid;
3092                         new_deleg->ls_lfp = lfp;
3093                         new_deleg->ls_clp = clp;
3094                         new_deleg->ls_filerev = filerev;
3095                         new_deleg->ls_compref = nd->nd_compref;
3096                         LIST_INSERT_HEAD(&lfp->lf_deleg, new_deleg, ls_file);
3097                         LIST_INSERT_HEAD(NFSSTATEHASH(clp,
3098                             new_deleg->ls_stateid), new_deleg, ls_hash);
3099                         LIST_INSERT_HEAD(&clp->lc_deleg, new_deleg, ls_list);
3100                         new_deleg = NULL;
3101                         nfsstatsv1.srvdelegates++;
3102                         nfsrv_openpluslock++;
3103                         nfsrv_delegatecnt++;
3104                     }
3105                 }
3106         } else {
3107                 /*
3108                  * New owner case. Start the open_owner sequence with a
3109                  * Needs confirmation (unless a reclaim) and hang the
3110                  * new open off it.
3111                  */
3112                 new_open->ls_stateid.seqid = 1;
3113                 new_open->ls_stateid.other[0] = clp->lc_clientid.lval[0];
3114                 new_open->ls_stateid.other[1] = clp->lc_clientid.lval[1];
3115                 new_open->ls_stateid.other[2] = nfsrv_nextstateindex(clp);
3116                 new_open->ls_flags = (new_stp->ls_flags & NFSLCK_SHAREBITS) |
3117                     NFSLCK_OPEN;
3118                 new_open->ls_uid = new_stp->ls_uid;
3119                 LIST_INIT(&new_open->ls_open);
3120                 new_open->ls_openowner = new_stp;
3121                 new_open->ls_lfp = lfp;
3122                 new_open->ls_clp = clp;
3123                 LIST_INSERT_HEAD(&lfp->lf_open, new_open, ls_file);
3124                 if (new_stp->ls_flags & NFSLCK_RECLAIM) {
3125                         new_stp->ls_flags = 0;
3126                 } else if ((nd->nd_flag & ND_NFSV41) != 0) {
3127                         /* NFSv4.1 never needs confirmation. */
3128                         new_stp->ls_flags = 0;
3129
3130                         /*
3131                          * This is where we can choose to issue a delegation.
3132                          */
3133                         if (delegate && nfsrv_issuedelegs &&
3134                             (writedeleg || readonly) &&
3135                             (clp->lc_flags & (LCL_CALLBACKSON | LCL_CBDOWN)) ==
3136                              LCL_CALLBACKSON &&
3137                             !NFSRV_V4DELEGLIMIT(nfsrv_delegatecnt) &&
3138                             NFSVNO_DELEGOK(vp) &&
3139                             ((nd->nd_flag & ND_NFSV41) == 0 ||
3140                              (new_stp->ls_flags & NFSLCK_WANTNODELEG) == 0)) {
3141                                 new_deleg->ls_stateid.seqid =
3142                                     delegstateidp->seqid = 1;
3143                                 new_deleg->ls_stateid.other[0] =
3144                                     delegstateidp->other[0]
3145                                     = clp->lc_clientid.lval[0];
3146                                 new_deleg->ls_stateid.other[1] =
3147                                     delegstateidp->other[1]
3148                                     = clp->lc_clientid.lval[1];
3149                                 new_deleg->ls_stateid.other[2] =
3150                                     delegstateidp->other[2]
3151                                     = nfsrv_nextstateindex(clp);
3152                                 if (writedeleg && !NFSVNO_EXRDONLY(exp) &&
3153                                     (nfsrv_writedelegifpos || !readonly) &&
3154                                     ((nd->nd_flag & ND_NFSV41) == 0 ||
3155                                      (new_stp->ls_flags & NFSLCK_WANTRDELEG) ==
3156                                      0)) {
3157                                         new_deleg->ls_flags =
3158                                             (NFSLCK_DELEGWRITE |
3159                                              NFSLCK_READACCESS |
3160                                              NFSLCK_WRITEACCESS);
3161                                         *rflagsp |= NFSV4OPEN_WRITEDELEGATE;
3162                                 } else {
3163                                         new_deleg->ls_flags =
3164                                             (NFSLCK_DELEGREAD |
3165                                              NFSLCK_READACCESS);
3166                                         *rflagsp |= NFSV4OPEN_READDELEGATE;
3167                                 }
3168                                 new_deleg->ls_uid = new_stp->ls_uid;
3169                                 new_deleg->ls_lfp = lfp;
3170                                 new_deleg->ls_clp = clp;
3171                                 new_deleg->ls_filerev = filerev;
3172                                 new_deleg->ls_compref = nd->nd_compref;
3173                                 LIST_INSERT_HEAD(&lfp->lf_deleg, new_deleg,
3174                                     ls_file);
3175                                 LIST_INSERT_HEAD(NFSSTATEHASH(clp,
3176                                     new_deleg->ls_stateid), new_deleg, ls_hash);
3177                                 LIST_INSERT_HEAD(&clp->lc_deleg, new_deleg,
3178                                     ls_list);
3179                                 new_deleg = NULL;
3180                                 nfsstatsv1.srvdelegates++;
3181                                 nfsrv_openpluslock++;
3182                                 nfsrv_delegatecnt++;
3183                         }
3184                 } else {
3185                         *rflagsp |= NFSV4OPEN_RESULTCONFIRM;
3186                         new_stp->ls_flags = NFSLCK_NEEDSCONFIRM;
3187                 }
3188                 nfsrvd_refcache(new_stp->ls_op);
3189                 new_stp->ls_noopens = 0;
3190                 LIST_INIT(&new_stp->ls_open);
3191                 LIST_INSERT_HEAD(&new_stp->ls_open, new_open, ls_list);
3192                 LIST_INSERT_HEAD(&clp->lc_open, new_stp, ls_list);
3193                 LIST_INSERT_HEAD(NFSSTATEHASH(clp, new_open->ls_stateid),
3194                     new_open, ls_hash);
3195                 openstp = new_open;
3196                 new_open = NULL;
3197                 *new_stpp = NULL;
3198                 nfsstatsv1.srvopens++;
3199                 nfsrv_openpluslock++;
3200                 nfsstatsv1.srvopenowners++;
3201                 nfsrv_openpluslock++;
3202         }
3203         if (!error) {
3204                 stateidp->seqid = openstp->ls_stateid.seqid;
3205                 stateidp->other[0] = openstp->ls_stateid.other[0];
3206                 stateidp->other[1] = openstp->ls_stateid.other[1];
3207                 stateidp->other[2] = openstp->ls_stateid.other[2];
3208         }
3209         NFSUNLOCKSTATE();
3210         if (haslock) {
3211                 NFSLOCKV4ROOTMUTEX();
3212                 nfsv4_unlock(&nfsv4rootfs_lock, 1);
3213                 NFSUNLOCKV4ROOTMUTEX();
3214         }
3215         if (new_open)
3216                 FREE((caddr_t)new_open, M_NFSDSTATE);
3217         if (new_deleg)
3218                 FREE((caddr_t)new_deleg, M_NFSDSTATE);
3219
3220 out:
3221         NFSEXITCODE2(error, nd);
3222         return (error);
3223 }
3224
3225 /*
3226  * Open update. Does the confirm, downgrade and close.
3227  */
3228 APPLESTATIC int
3229 nfsrv_openupdate(vnode_t vp, struct nfsstate *new_stp, nfsquad_t clientid,
3230     nfsv4stateid_t *stateidp, struct nfsrv_descript *nd, NFSPROC_T *p)
3231 {
3232         struct nfsstate *stp, *ownerstp;
3233         struct nfsclient *clp;
3234         struct nfslockfile *lfp;
3235         u_int32_t bits;
3236         int error = 0, gotstate = 0, len = 0;
3237         u_char client[NFSV4_OPAQUELIMIT];
3238
3239         /*
3240          * Check for restart conditions (client and server).
3241          */
3242         error = nfsrv_checkrestart(clientid, new_stp->ls_flags,
3243             &new_stp->ls_stateid, 0);
3244         if (error)
3245                 goto out;
3246
3247         NFSLOCKSTATE();
3248         /*
3249          * Get the open structure via clientid and stateid.
3250          */
3251         error = nfsrv_getclient(clientid, CLOPS_RENEW, &clp, NULL,
3252             (nfsquad_t)((u_quad_t)0), 0, nd, p);
3253         if (!error)
3254                 error = nfsrv_getstate(clp, &new_stp->ls_stateid,
3255                     new_stp->ls_flags, &stp);
3256
3257         /*
3258          * Sanity check the open.
3259          */
3260         if (!error && (!(stp->ls_flags & NFSLCK_OPEN) ||
3261                 (!(new_stp->ls_flags & NFSLCK_CONFIRM) &&
3262                  (stp->ls_openowner->ls_flags & NFSLCK_NEEDSCONFIRM)) ||
3263                 ((new_stp->ls_flags & NFSLCK_CONFIRM) &&
3264                  (!(stp->ls_openowner->ls_flags & NFSLCK_NEEDSCONFIRM)))))
3265                 error = NFSERR_BADSTATEID;
3266
3267         if (!error)
3268                 error = nfsrv_checkseqid(nd, new_stp->ls_seq,
3269                     stp->ls_openowner, new_stp->ls_op);
3270         if (!error && stp->ls_stateid.seqid != new_stp->ls_stateid.seqid &&
3271             (((nd->nd_flag & ND_NFSV41) == 0 &&
3272               !(new_stp->ls_flags & NFSLCK_CONFIRM)) ||
3273              ((nd->nd_flag & ND_NFSV41) != 0 &&
3274               new_stp->ls_stateid.seqid != 0)))
3275                 error = NFSERR_OLDSTATEID;
3276         if (!error && vnode_vtype(vp) != VREG) {
3277                 if (vnode_vtype(vp) == VDIR)
3278                         error = NFSERR_ISDIR;
3279                 else
3280                         error = NFSERR_INVAL;
3281         }
3282
3283         if (error) {
3284                 /*
3285                  * If a client tries to confirm an Open with a bad
3286                  * seqid# and there are no byte range locks or other Opens
3287                  * on the openowner, just throw it away, so the next use of the
3288                  * openowner will start a fresh seq#.
3289                  */
3290                 if (error == NFSERR_BADSEQID &&
3291                     (new_stp->ls_flags & NFSLCK_CONFIRM) &&
3292                     nfsrv_nootherstate(stp))
3293                         nfsrv_freeopenowner(stp->ls_openowner, 0, p);
3294                 NFSUNLOCKSTATE();
3295                 goto out;
3296         }
3297
3298         /*
3299          * Set the return stateid.
3300          */
3301         stateidp->seqid = stp->ls_stateid.seqid + 1;
3302         if ((nd->nd_flag & ND_NFSV41) != 0 && stateidp->seqid == 0)
3303                 stateidp->seqid = 1;
3304         stateidp->other[0] = stp->ls_stateid.other[0];
3305         stateidp->other[1] = stp->ls_stateid.other[1];
3306         stateidp->other[2] = stp->ls_stateid.other[2];
3307         /*
3308          * Now, handle the three cases.
3309          */
3310         if (new_stp->ls_flags & NFSLCK_CONFIRM) {
3311                 /*
3312                  * If the open doesn't need confirmation, it seems to me that
3313                  * there is a client error, but I'll just log it and keep going?
3314                  */
3315                 if (!(stp->ls_openowner->ls_flags & NFSLCK_NEEDSCONFIRM))
3316                         printf("Nfsv4d: stray open confirm\n");
3317                 stp->ls_openowner->ls_flags = 0;
3318                 stp->ls_stateid.seqid++;
3319                 if ((nd->nd_flag & ND_NFSV41) != 0 &&
3320                     stp->ls_stateid.seqid == 0)
3321                         stp->ls_stateid.seqid = 1;
3322                 if (!(clp->lc_flags & LCL_STAMPEDSTABLE)) {
3323                         clp->lc_flags |= LCL_STAMPEDSTABLE;
3324                         len = clp->lc_idlen;
3325                         NFSBCOPY(clp->lc_id, client, len);
3326                         gotstate = 1;
3327                 }
3328                 NFSUNLOCKSTATE();
3329         } else if (new_stp->ls_flags & NFSLCK_CLOSE) {
3330                 ownerstp = stp->ls_openowner;
3331                 lfp = stp->ls_lfp;
3332                 if (nfsrv_dolocallocks != 0 && !LIST_EMPTY(&stp->ls_open)) {
3333                         /* Get the lf lock */
3334                         nfsrv_locklf(lfp);
3335                         NFSUNLOCKSTATE();
3336                         ASSERT_VOP_ELOCKED(vp, "nfsrv_openupdate");
3337                         NFSVOPUNLOCK(vp, 0);
3338                         if (nfsrv_freeopen(stp, vp, 1, p) == 0) {
3339                                 NFSLOCKSTATE();
3340                                 nfsrv_unlocklf(lfp);
3341                                 NFSUNLOCKSTATE();
3342                         }
3343                         NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
3344                 } else {
3345                         (void) nfsrv_freeopen(stp, NULL, 0, p);
3346                         NFSUNLOCKSTATE();
3347                 }
3348         } else {
3349                 /*
3350                  * Update the share bits, making sure that the new set are a
3351                  * subset of the old ones.
3352                  */
3353                 bits = (new_stp->ls_flags & NFSLCK_SHAREBITS);
3354                 if (~(stp->ls_flags) & bits) {
3355                         NFSUNLOCKSTATE();
3356                         error = NFSERR_INVAL;
3357                         goto out;
3358                 }
3359                 stp->ls_flags = (bits | NFSLCK_OPEN);
3360                 stp->ls_stateid.seqid++;
3361                 if ((nd->nd_flag & ND_NFSV41) != 0 &&
3362                     stp->ls_stateid.seqid == 0)
3363                         stp->ls_stateid.seqid = 1;
3364                 NFSUNLOCKSTATE();
3365         }
3366
3367         /*
3368          * If the client just confirmed its first open, write a timestamp
3369          * to the stable storage file.
3370          */
3371         if (gotstate != 0) {
3372                 nfsrv_writestable(client, len, NFSNST_NEWSTATE, p);
3373                 nfsrv_backupstable();
3374         }
3375
3376 out:
3377         NFSEXITCODE2(error, nd);
3378         return (error);
3379 }
3380
3381 /*
3382  * Delegation update. Does the purge and return.
3383  */
3384 APPLESTATIC int
3385 nfsrv_delegupdate(struct nfsrv_descript *nd, nfsquad_t clientid,
3386     nfsv4stateid_t *stateidp, vnode_t vp, int op, struct ucred *cred,
3387     NFSPROC_T *p)
3388 {
3389         struct nfsstate *stp;
3390         struct nfsclient *clp;
3391         int error = 0;
3392         fhandle_t fh;
3393
3394         /*
3395          * Do a sanity check against the file handle for DelegReturn.
3396          */
3397         if (vp) {
3398                 error = nfsvno_getfh(vp, &fh, p);
3399                 if (error)
3400                         goto out;
3401         }
3402         /*
3403          * Check for restart conditions (client and server).
3404          */
3405         if (op == NFSV4OP_DELEGRETURN)
3406                 error = nfsrv_checkrestart(clientid, NFSLCK_DELEGRETURN,
3407                         stateidp, 0);
3408         else
3409                 error = nfsrv_checkrestart(clientid, NFSLCK_DELEGPURGE,
3410                         stateidp, 0);
3411
3412         NFSLOCKSTATE();
3413         /*
3414          * Get the open structure via clientid and stateid.
3415          */
3416         if (!error)
3417             error = nfsrv_getclient(clientid, CLOPS_RENEW, &clp, NULL,
3418                 (nfsquad_t)((u_quad_t)0), 0, nd, p);
3419         if (error) {
3420                 if (error == NFSERR_CBPATHDOWN)
3421                         error = 0;
3422                 if (error == NFSERR_STALECLIENTID && op == NFSV4OP_DELEGRETURN)
3423                         error = NFSERR_STALESTATEID;
3424         }
3425         if (!error && op == NFSV4OP_DELEGRETURN) {
3426             error = nfsrv_getstate(clp, stateidp, NFSLCK_DELEGRETURN, &stp);
3427             if (!error && stp->ls_stateid.seqid != stateidp->seqid &&
3428                 ((nd->nd_flag & ND_NFSV41) == 0 || stateidp->seqid != 0))
3429                 error = NFSERR_OLDSTATEID;
3430         }
3431         /*
3432          * NFSERR_EXPIRED means that the state has gone away,
3433          * so Delegations have been purged. Just return ok.
3434          */
3435         if (error == NFSERR_EXPIRED && op == NFSV4OP_DELEGPURGE) {
3436                 NFSUNLOCKSTATE();
3437                 error = 0;
3438                 goto out;
3439         }
3440         if (error) {
3441                 NFSUNLOCKSTATE();
3442                 goto out;
3443         }
3444
3445         if (op == NFSV4OP_DELEGRETURN) {
3446                 if (NFSBCMP((caddr_t)&fh, (caddr_t)&stp->ls_lfp->lf_fh,
3447                     sizeof (fhandle_t))) {
3448                         NFSUNLOCKSTATE();
3449                         error = NFSERR_BADSTATEID;
3450                         goto out;
3451                 }
3452                 nfsrv_freedeleg(stp);
3453         } else {
3454                 nfsrv_freedeleglist(&clp->lc_olddeleg);
3455         }
3456         NFSUNLOCKSTATE();
3457         error = 0;
3458
3459 out:
3460         NFSEXITCODE(error);
3461         return (error);
3462 }
3463
3464 /*
3465  * Release lock owner.
3466  */
3467 APPLESTATIC int
3468 nfsrv_releaselckown(struct nfsstate *new_stp, nfsquad_t clientid,
3469     NFSPROC_T *p)
3470 {
3471         struct nfsstate *stp, *nstp, *openstp, *ownstp;
3472         struct nfsclient *clp;
3473         int error = 0;
3474
3475         /*
3476          * Check for restart conditions (client and server).
3477          */
3478         error = nfsrv_checkrestart(clientid, new_stp->ls_flags,
3479             &new_stp->ls_stateid, 0);
3480         if (error)
3481                 goto out;
3482
3483         NFSLOCKSTATE();
3484         /*
3485          * Get the lock owner by name.
3486          */
3487         error = nfsrv_getclient(clientid, CLOPS_RENEW, &clp, NULL,
3488             (nfsquad_t)((u_quad_t)0), 0, NULL, p);
3489         if (error) {
3490                 NFSUNLOCKSTATE();
3491                 goto out;
3492         }
3493         LIST_FOREACH(ownstp, &clp->lc_open, ls_list) {
3494             LIST_FOREACH(openstp, &ownstp->ls_open, ls_list) {
3495                 stp = LIST_FIRST(&openstp->ls_open);
3496                 while (stp != LIST_END(&openstp->ls_open)) {
3497                     nstp = LIST_NEXT(stp, ls_list);
3498                     /*
3499                      * If the owner matches, check for locks and
3500                      * then free or return an error.
3501                      */
3502                     if (stp->ls_ownerlen == new_stp->ls_ownerlen &&
3503                         !NFSBCMP(stp->ls_owner, new_stp->ls_owner,
3504                          stp->ls_ownerlen)){
3505                         if (LIST_EMPTY(&stp->ls_lock)) {
3506                             nfsrv_freelockowner(stp, NULL, 0, p);
3507                         } else {
3508                             NFSUNLOCKSTATE();
3509                             error = NFSERR_LOCKSHELD;
3510                             goto out;
3511                         }
3512                     }
3513                     stp = nstp;
3514                 }
3515             }
3516         }
3517         NFSUNLOCKSTATE();
3518
3519 out:
3520         NFSEXITCODE(error);
3521         return (error);
3522 }
3523
3524 /*
3525  * Get the file handle for a lock structure.
3526  */
3527 static int
3528 nfsrv_getlockfh(vnode_t vp, u_short flags, struct nfslockfile *new_lfp,
3529     fhandle_t *nfhp, NFSPROC_T *p)
3530 {
3531         fhandle_t *fhp = NULL;
3532         int error;
3533
3534         /*
3535          * For lock, use the new nfslock structure, otherwise just
3536          * a fhandle_t on the stack.
3537          */
3538         if (flags & NFSLCK_OPEN) {
3539                 KASSERT(new_lfp != NULL, ("nfsrv_getlockfh: new_lfp NULL"));
3540                 fhp = &new_lfp->lf_fh;
3541         } else if (nfhp) {
3542                 fhp = nfhp;
3543         } else {
3544                 panic("nfsrv_getlockfh");
3545         }
3546         error = nfsvno_getfh(vp, fhp, p);
3547         NFSEXITCODE(error);
3548         return (error);
3549 }
3550
3551 /*
3552  * Get an nfs lock structure. Allocate one, as required, and return a
3553  * pointer to it.
3554  * Returns an NFSERR_xxx upon failure or -1 to indicate no current lock.
3555  */
3556 static int
3557 nfsrv_getlockfile(u_short flags, struct nfslockfile **new_lfpp,
3558     struct nfslockfile **lfpp, fhandle_t *nfhp, int lockit)
3559 {
3560         struct nfslockfile *lfp;
3561         fhandle_t *fhp = NULL, *tfhp;
3562         struct nfslockhashhead *hp;
3563         struct nfslockfile *new_lfp = NULL;
3564
3565         /*
3566          * For lock, use the new nfslock structure, otherwise just
3567          * a fhandle_t on the stack.
3568          */
3569         if (flags & NFSLCK_OPEN) {
3570                 new_lfp = *new_lfpp;
3571                 fhp = &new_lfp->lf_fh;
3572         } else if (nfhp) {
3573                 fhp = nfhp;
3574         } else {
3575                 panic("nfsrv_getlockfile");
3576         }
3577
3578         hp = NFSLOCKHASH(fhp);
3579         LIST_FOREACH(lfp, hp, lf_hash) {
3580                 tfhp = &lfp->lf_fh;
3581                 if (NFSVNO_CMPFH(fhp, tfhp)) {
3582                         if (lockit)
3583                                 nfsrv_locklf(lfp);
3584                         *lfpp = lfp;
3585                         return (0);
3586                 }
3587         }
3588         if (!(flags & NFSLCK_OPEN))
3589                 return (-1);
3590
3591         /*
3592          * No match, so chain the new one into the list.
3593          */
3594         LIST_INIT(&new_lfp->lf_open);
3595         LIST_INIT(&new_lfp->lf_lock);
3596         LIST_INIT(&new_lfp->lf_deleg);
3597         LIST_INIT(&new_lfp->lf_locallock);
3598         LIST_INIT(&new_lfp->lf_rollback);
3599         new_lfp->lf_locallock_lck.nfslock_usecnt = 0;
3600         new_lfp->lf_locallock_lck.nfslock_lock = 0;
3601         new_lfp->lf_usecount = 0;
3602         LIST_INSERT_HEAD(hp, new_lfp, lf_hash);
3603         *lfpp = new_lfp;
3604         *new_lfpp = NULL;
3605         return (0);
3606 }
3607
3608 /*
3609  * This function adds a nfslock lock structure to the list for the associated
3610  * nfsstate and nfslockfile structures. It will be inserted after the
3611  * entry pointed at by insert_lop.
3612  */
3613 static void
3614 nfsrv_insertlock(struct nfslock *new_lop, struct nfslock *insert_lop,
3615     struct nfsstate *stp, struct nfslockfile *lfp)
3616 {
3617         struct nfslock *lop, *nlop;
3618
3619         new_lop->lo_stp = stp;
3620         new_lop->lo_lfp = lfp;
3621
3622         if (stp != NULL) {
3623                 /* Insert in increasing lo_first order */
3624                 lop = LIST_FIRST(&lfp->lf_lock);
3625                 if (lop == LIST_END(&lfp->lf_lock) ||
3626                     new_lop->lo_first <= lop->lo_first) {
3627                         LIST_INSERT_HEAD(&lfp->lf_lock, new_lop, lo_lckfile);
3628                 } else {
3629                         nlop = LIST_NEXT(lop, lo_lckfile);
3630                         while (nlop != LIST_END(&lfp->lf_lock) &&
3631                                nlop->lo_first < new_lop->lo_first) {
3632                                 lop = nlop;
3633                                 nlop = LIST_NEXT(lop, lo_lckfile);
3634                         }
3635                         LIST_INSERT_AFTER(lop, new_lop, lo_lckfile);
3636                 }
3637         } else {
3638                 new_lop->lo_lckfile.le_prev = NULL;     /* list not used */
3639         }
3640
3641         /*
3642          * Insert after insert_lop, which is overloaded as stp or lfp for
3643          * an empty list.
3644          */
3645         if (stp == NULL && (struct nfslockfile *)insert_lop == lfp)
3646                 LIST_INSERT_HEAD(&lfp->lf_locallock, new_lop, lo_lckowner);
3647         else if ((struct nfsstate *)insert_lop == stp)
3648                 LIST_INSERT_HEAD(&stp->ls_lock, new_lop, lo_lckowner);
3649         else
3650                 LIST_INSERT_AFTER(insert_lop, new_lop, lo_lckowner);
3651         if (stp != NULL) {
3652                 nfsstatsv1.srvlocks++;
3653                 nfsrv_openpluslock++;
3654         }
3655 }
3656
3657 /*
3658  * This function updates the locking for a lock owner and given file. It
3659  * maintains a list of lock ranges ordered on increasing file offset that
3660  * are NFSLCK_READ or NFSLCK_WRITE and non-overlapping (aka POSIX style).
3661  * It always adds new_lop to the list and sometimes uses the one pointed
3662  * at by other_lopp.
3663  */
3664 static void
3665 nfsrv_updatelock(struct nfsstate *stp, struct nfslock **new_lopp,
3666     struct nfslock **other_lopp, struct nfslockfile *lfp)
3667 {
3668         struct nfslock *new_lop = *new_lopp;
3669         struct nfslock *lop, *tlop, *ilop;
3670         struct nfslock *other_lop = *other_lopp;
3671         int unlock = 0, myfile = 0;
3672         u_int64_t tmp;
3673
3674         /*
3675          * Work down the list until the lock is merged.
3676          */
3677         if (new_lop->lo_flags & NFSLCK_UNLOCK)
3678                 unlock = 1;
3679         if (stp != NULL) {
3680                 ilop = (struct nfslock *)stp;
3681                 lop = LIST_FIRST(&stp->ls_lock);
3682         } else {
3683                 ilop = (struct nfslock *)lfp;
3684                 lop = LIST_FIRST(&lfp->lf_locallock);
3685         }
3686         while (lop != NULL) {
3687             /*
3688              * Only check locks for this file that aren't before the start of
3689              * new lock's range.
3690              */
3691             if (lop->lo_lfp == lfp) {
3692               myfile = 1;
3693               if (lop->lo_end >= new_lop->lo_first) {
3694                 if (new_lop->lo_end < lop->lo_first) {
3695                         /*
3696                          * If the new lock ends before the start of the
3697                          * current lock's range, no merge, just insert
3698                          * the new lock.
3699                          */
3700                         break;
3701                 }
3702                 if (new_lop->lo_flags == lop->lo_flags ||
3703                     (new_lop->lo_first <= lop->lo_first &&
3704                      new_lop->lo_end >= lop->lo_end)) {
3705                         /*
3706                          * This lock can be absorbed by the new lock/unlock.
3707                          * This happens when it covers the entire range
3708                          * of the old lock or is contiguous
3709                          * with the old lock and is of the same type or an
3710                          * unlock.
3711                          */
3712                         if (lop->lo_first < new_lop->lo_first)
3713                                 new_lop->lo_first = lop->lo_first;
3714                         if (lop->lo_end > new_lop->lo_end)
3715                                 new_lop->lo_end = lop->lo_end;
3716                         tlop = lop;
3717                         lop = LIST_NEXT(lop, lo_lckowner);
3718                         nfsrv_freenfslock(tlop);
3719                         continue;
3720                 }
3721
3722                 /*
3723                  * All these cases are for contiguous locks that are not the
3724                  * same type, so they can't be merged.
3725                  */
3726                 if (new_lop->lo_first <= lop->lo_first) {
3727                         /*
3728                          * This case is where the new lock overlaps with the
3729                          * first part of the old lock. Move the start of the
3730                          * old lock to just past the end of the new lock. The
3731                          * new lock will be inserted in front of the old, since
3732                          * ilop hasn't been updated. (We are done now.)
3733                          */
3734                         lop->lo_first = new_lop->lo_end;
3735                         break;
3736                 }
3737                 if (new_lop->lo_end >= lop->lo_end) {
3738                         /*
3739                          * This case is where the new lock overlaps with the
3740                          * end of the old lock's range. Move the old lock's
3741                          * end to just before the new lock's first and insert
3742                          * the new lock after the old lock.
3743                          * Might not be done yet, since the new lock could
3744                          * overlap further locks with higher ranges.
3745                          */
3746                         lop->lo_end = new_lop->lo_first;
3747                         ilop = lop;
3748                         lop = LIST_NEXT(lop, lo_lckowner);
3749                         continue;
3750                 }
3751                 /*
3752                  * The final case is where the new lock's range is in the
3753                  * middle of the current lock's and splits the current lock
3754                  * up. Use *other_lopp to handle the second part of the
3755                  * split old lock range. (We are done now.)
3756                  * For unlock, we use new_lop as other_lop and tmp, since
3757                  * other_lop and new_lop are the same for this case.
3758                  * We noted the unlock case above, so we don't need
3759                  * new_lop->lo_flags any longer.
3760                  */
3761                 tmp = new_lop->lo_first;
3762                 if (other_lop == NULL) {
3763                         if (!unlock)
3764                                 panic("nfsd srv update unlock");
3765                         other_lop = new_lop;
3766                         *new_lopp = NULL;
3767                 }
3768                 other_lop->lo_first = new_lop->lo_end;
3769                 other_lop->lo_end = lop->lo_end;
3770                 other_lop->lo_flags = lop->lo_flags;
3771                 other_lop->lo_stp = stp;
3772                 other_lop->lo_lfp = lfp;
3773                 lop->lo_end = tmp;
3774                 nfsrv_insertlock(other_lop, lop, stp, lfp);
3775                 *other_lopp = NULL;
3776                 ilop = lop;
3777                 break;
3778               }
3779             }
3780             ilop = lop;
3781             lop = LIST_NEXT(lop, lo_lckowner);
3782             if (myfile && (lop == NULL || lop->lo_lfp != lfp))
3783                 break;
3784         }
3785
3786         /*
3787          * Insert the new lock in the list at the appropriate place.
3788          */
3789         if (!unlock) {
3790                 nfsrv_insertlock(new_lop, ilop, stp, lfp);
3791                 *new_lopp = NULL;
3792         }
3793 }
3794
3795 /*
3796  * This function handles sequencing of locks, etc.
3797  * It returns an error that indicates what the caller should do.
3798  */
3799 static int
3800 nfsrv_checkseqid(struct nfsrv_descript *nd, u_int32_t seqid,
3801     struct nfsstate *stp, struct nfsrvcache *op)
3802 {
3803         int error = 0;
3804
3805         if ((nd->nd_flag & ND_NFSV41) != 0)
3806                 /* NFSv4.1 ignores the open_seqid and lock_seqid. */
3807                 goto out;
3808         if (op != nd->nd_rp)
3809                 panic("nfsrvstate checkseqid");
3810         if (!(op->rc_flag & RC_INPROG))
3811                 panic("nfsrvstate not inprog");
3812         if (stp->ls_op && stp->ls_op->rc_refcnt <= 0) {
3813                 printf("refcnt=%d\n", stp->ls_op->rc_refcnt);
3814                 panic("nfsrvstate op refcnt");
3815         }
3816         if ((stp->ls_seq + 1) == seqid) {
3817                 if (stp->ls_op)
3818                         nfsrvd_derefcache(stp->ls_op);
3819                 stp->ls_op = op;
3820                 nfsrvd_refcache(op);
3821                 stp->ls_seq = seqid;
3822                 goto out;
3823         } else if (stp->ls_seq == seqid && stp->ls_op &&
3824                 op->rc_xid == stp->ls_op->rc_xid &&
3825                 op->rc_refcnt == 0 &&
3826                 op->rc_reqlen == stp->ls_op->rc_reqlen &&
3827                 op->rc_cksum == stp->ls_op->rc_cksum) {
3828                 if (stp->ls_op->rc_flag & RC_INPROG) {
3829                         error = NFSERR_DONTREPLY;
3830                         goto out;
3831                 }
3832                 nd->nd_rp = stp->ls_op;
3833                 nd->nd_rp->rc_flag |= RC_INPROG;
3834                 nfsrvd_delcache(op);
3835                 error = NFSERR_REPLYFROMCACHE;
3836                 goto out;
3837         }
3838         error = NFSERR_BADSEQID;
3839
3840 out:
3841         NFSEXITCODE2(error, nd);
3842         return (error);
3843 }
3844
3845 /*
3846  * Get the client ip address for callbacks. If the strings can't be parsed,
3847  * just set lc_program to 0 to indicate no callbacks are possible.
3848  * (For cases where the address can't be parsed or is 0.0.0.0.0.0, set
3849  *  the address to the client's transport address. This won't be used
3850  *  for callbacks, but can be printed out by nfsstats for info.)
3851  * Return error if the xdr can't be parsed, 0 otherwise.
3852  */
3853 APPLESTATIC int
3854 nfsrv_getclientipaddr(struct nfsrv_descript *nd, struct nfsclient *clp)
3855 {
3856         u_int32_t *tl;
3857         u_char *cp, *cp2;
3858         int i, j;
3859         struct sockaddr_in *rad, *sad;
3860         u_char protocol[5], addr[24];
3861         int error = 0, cantparse = 0;
3862         union {
3863                 u_long ival;
3864                 u_char cval[4];
3865         } ip;
3866         union {
3867                 u_short sval;
3868                 u_char cval[2];
3869         } port;
3870
3871         rad = NFSSOCKADDR(clp->lc_req.nr_nam, struct sockaddr_in *);
3872         rad->sin_family = AF_INET;
3873         rad->sin_len = sizeof (struct sockaddr_in);
3874         rad->sin_addr.s_addr = 0;
3875         rad->sin_port = 0;
3876         clp->lc_req.nr_client = NULL;
3877         clp->lc_req.nr_lock = 0;
3878         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
3879         i = fxdr_unsigned(int, *tl);
3880         if (i >= 3 && i <= 4) {
3881                 error = nfsrv_mtostr(nd, protocol, i);
3882                 if (error)
3883                         goto nfsmout;
3884                 if (!strcmp(protocol, "tcp")) {
3885                         clp->lc_flags |= LCL_TCPCALLBACK;
3886                         clp->lc_req.nr_sotype = SOCK_STREAM;
3887                         clp->lc_req.nr_soproto = IPPROTO_TCP;
3888                 } else if (!strcmp(protocol, "udp")) {
3889                         clp->lc_req.nr_sotype = SOCK_DGRAM;
3890                         clp->lc_req.nr_soproto = IPPROTO_UDP;
3891                 } else {
3892                         cantparse = 1;
3893                 }
3894         } else {
3895                 cantparse = 1;
3896                 if (i > 0) {
3897                         error = nfsm_advance(nd, NFSM_RNDUP(i), -1);
3898                         if (error)
3899                                 goto nfsmout;
3900                 }
3901         }
3902         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
3903         i = fxdr_unsigned(int, *tl);
3904         if (i < 0) {
3905                 error = NFSERR_BADXDR;
3906                 goto nfsmout;
3907         } else if (i == 0) {
3908                 cantparse = 1;
3909         } else if (!cantparse && i <= 23 && i >= 11) {
3910                 error = nfsrv_mtostr(nd, addr, i);
3911                 if (error)
3912                         goto nfsmout;
3913
3914                 /*
3915                  * Parse out the address fields. We expect 6 decimal numbers
3916                  * separated by '.'s.
3917                  */
3918                 cp = addr;
3919                 i = 0;
3920                 while (*cp && i < 6) {
3921                         cp2 = cp;
3922                         while (*cp2 && *cp2 != '.')
3923                                 cp2++;
3924                         if (*cp2)
3925                                 *cp2++ = '\0';
3926                         else if (i != 5) {
3927                                 cantparse = 1;
3928                                 break;
3929                         }
3930                         j = nfsrv_getipnumber(cp);
3931                         if (j >= 0) {
3932                                 if (i < 4)
3933                                         ip.cval[3 - i] = j;
3934                                 else
3935                                         port.cval[5 - i] = j;
3936                         } else {
3937                                 cantparse = 1;
3938                                 break;
3939                         }
3940                         cp = cp2;
3941                         i++;
3942                 }
3943                 if (!cantparse) {
3944                         if (ip.ival != 0x0) {
3945                                 rad->sin_addr.s_addr = htonl(ip.ival);
3946                                 rad->sin_port = htons(port.sval);
3947                         } else {
3948                                 cantparse = 1;
3949                         }
3950                 }
3951         } else {
3952                 cantparse = 1;
3953                 if (i > 0) {
3954                         error = nfsm_advance(nd, NFSM_RNDUP(i), -1);
3955                         if (error)
3956                                 goto nfsmout;
3957                 }
3958         }
3959         if (cantparse) {
3960                 sad = NFSSOCKADDR(nd->nd_nam, struct sockaddr_in *);
3961                 rad->sin_addr.s_addr = sad->sin_addr.s_addr;
3962                 rad->sin_port = 0x0;
3963                 clp->lc_program = 0;
3964         }
3965 nfsmout:
3966         NFSEXITCODE2(error, nd);
3967         return (error);
3968 }
3969
3970 /*
3971  * Turn a string of up to three decimal digits into a number. Return -1 upon
3972  * error.
3973  */
3974 static int
3975 nfsrv_getipnumber(u_char *cp)
3976 {
3977         int i = 0, j = 0;
3978
3979         while (*cp) {
3980                 if (j > 2 || *cp < '0' || *cp > '9')
3981                         return (-1);
3982                 i *= 10;
3983                 i += (*cp - '0');
3984                 cp++;
3985                 j++;
3986         }
3987         if (i < 256)
3988                 return (i);
3989         return (-1);
3990 }
3991
3992 /*
3993  * This function checks for restart conditions.
3994  */
3995 static int
3996 nfsrv_checkrestart(nfsquad_t clientid, u_int32_t flags,
3997     nfsv4stateid_t *stateidp, int specialid)
3998 {
3999         int ret = 0;
4000
4001         /*
4002          * First check for a server restart. Open, LockT, ReleaseLockOwner
4003          * and DelegPurge have a clientid, the rest a stateid.
4004          */
4005         if (flags &
4006             (NFSLCK_OPEN | NFSLCK_TEST | NFSLCK_RELEASE | NFSLCK_DELEGPURGE)) {
4007                 if (clientid.lval[0] != nfsrvboottime) {
4008                         ret = NFSERR_STALECLIENTID;
4009                         goto out;
4010                 }
4011         } else if (stateidp->other[0] != nfsrvboottime &&
4012                 specialid == 0) {
4013                 ret = NFSERR_STALESTATEID;
4014                 goto out;
4015         }
4016
4017         /*
4018          * Read, Write, Setattr and LockT can return NFSERR_GRACE and do
4019          * not use a lock/open owner seqid#, so the check can be done now.
4020          * (The others will be checked, as required, later.)
4021          */
4022         if (!(flags & (NFSLCK_CHECK | NFSLCK_TEST)))
4023                 goto out;
4024
4025         NFSLOCKSTATE();
4026         ret = nfsrv_checkgrace(NULL, NULL, flags);
4027         NFSUNLOCKSTATE();
4028
4029 out:
4030         NFSEXITCODE(ret);
4031         return (ret);
4032 }
4033
4034 /*
4035  * Check for grace.
4036  */
4037 static int
4038 nfsrv_checkgrace(struct nfsrv_descript *nd, struct nfsclient *clp,
4039     u_int32_t flags)
4040 {
4041         int error = 0;
4042
4043         if ((nfsrv_stablefirst.nsf_flags & NFSNSF_GRACEOVER) != 0) {
4044                 if (flags & NFSLCK_RECLAIM) {
4045                         error = NFSERR_NOGRACE;
4046                         goto out;
4047                 }
4048         } else {
4049                 if (!(flags & NFSLCK_RECLAIM)) {
4050                         error = NFSERR_GRACE;
4051                         goto out;
4052                 }
4053                 if (nd != NULL && clp != NULL &&
4054                     (nd->nd_flag & ND_NFSV41) != 0 &&
4055                     (clp->lc_flags & LCL_RECLAIMCOMPLETE) != 0) {
4056                         error = NFSERR_NOGRACE;
4057                         goto out;
4058                 }
4059
4060                 /*
4061                  * If grace is almost over and we are still getting Reclaims,
4062                  * extend grace a bit.
4063                  */
4064                 if ((NFSD_MONOSEC + NFSRV_LEASEDELTA) >
4065                     nfsrv_stablefirst.nsf_eograce)
4066                         nfsrv_stablefirst.nsf_eograce = NFSD_MONOSEC +
4067                                 NFSRV_LEASEDELTA;
4068         }
4069
4070 out:
4071         NFSEXITCODE(error);
4072         return (error);
4073 }
4074
4075 /*
4076  * Do a server callback.
4077  */
4078 static int
4079 nfsrv_docallback(struct nfsclient *clp, int procnum,
4080     nfsv4stateid_t *stateidp, int trunc, fhandle_t *fhp,
4081     struct nfsvattr *nap, nfsattrbit_t *attrbitp, NFSPROC_T *p)
4082 {
4083         mbuf_t m;
4084         u_int32_t *tl;
4085         struct nfsrv_descript nfsd, *nd = &nfsd;
4086         struct ucred *cred;
4087         int error = 0;
4088         u_int32_t callback;
4089         struct nfsdsession *sep = NULL;
4090
4091         cred = newnfs_getcred();
4092         NFSLOCKSTATE(); /* mostly for lc_cbref++ */
4093         if (clp->lc_flags & LCL_NEEDSCONFIRM) {
4094                 NFSUNLOCKSTATE();
4095                 panic("docallb");
4096         }
4097         clp->lc_cbref++;
4098
4099         /*
4100          * Fill the callback program# and version into the request
4101          * structure for newnfs_connect() to use.
4102          */
4103         clp->lc_req.nr_prog = clp->lc_program;
4104 #ifdef notnow
4105         if ((clp->lc_flags & LCL_NFSV41) != 0)
4106                 clp->lc_req.nr_vers = NFSV41_CBVERS;
4107         else
4108 #endif
4109                 clp->lc_req.nr_vers = NFSV4_CBVERS;
4110
4111         /*
4112          * First, fill in some of the fields of nd and cr.
4113          */
4114         nd->nd_flag = ND_NFSV4;
4115         if (clp->lc_flags & LCL_GSS)
4116                 nd->nd_flag |= ND_KERBV;
4117         if ((clp->lc_flags & LCL_NFSV41) != 0)
4118                 nd->nd_flag |= ND_NFSV41;
4119         nd->nd_repstat = 0;
4120         cred->cr_uid = clp->lc_uid;
4121         cred->cr_gid = clp->lc_gid;
4122         callback = clp->lc_callback;
4123         NFSUNLOCKSTATE();
4124         cred->cr_ngroups = 1;
4125
4126         /*
4127          * Get the first mbuf for the request.
4128          */
4129         MGET(m, M_WAITOK, MT_DATA);
4130         mbuf_setlen(m, 0);
4131         nd->nd_mreq = nd->nd_mb = m;
4132         nd->nd_bpos = NFSMTOD(m, caddr_t);
4133
4134         /*
4135          * and build the callback request.
4136          */
4137         if (procnum == NFSV4OP_CBGETATTR) {
4138                 nd->nd_procnum = NFSV4PROC_CBCOMPOUND;
4139                 error = nfsrv_cbcallargs(nd, clp, callback, NFSV4OP_CBGETATTR,
4140                     "CB Getattr", &sep);
4141                 if (error != 0) {
4142                         mbuf_freem(nd->nd_mreq);
4143                         goto errout;
4144                 }
4145                 (void)nfsm_fhtom(nd, (u_int8_t *)fhp, NFSX_MYFH, 0);
4146                 (void)nfsrv_putattrbit(nd, attrbitp);
4147         } else if (procnum == NFSV4OP_CBRECALL) {
4148                 nd->nd_procnum = NFSV4PROC_CBCOMPOUND;
4149                 error = nfsrv_cbcallargs(nd, clp, callback, NFSV4OP_CBRECALL,
4150                     "CB Recall", &sep);
4151                 if (error != 0) {
4152                         mbuf_freem(nd->nd_mreq);
4153                         goto errout;
4154                 }
4155                 NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED + NFSX_STATEID);
4156                 *tl++ = txdr_unsigned(stateidp->seqid);
4157                 NFSBCOPY((caddr_t)stateidp->other, (caddr_t)tl,
4158                     NFSX_STATEIDOTHER);
4159                 tl += (NFSX_STATEIDOTHER / NFSX_UNSIGNED);
4160                 if (trunc)
4161                         *tl = newnfs_true;
4162                 else
4163                         *tl = newnfs_false;
4164                 (void)nfsm_fhtom(nd, (u_int8_t *)fhp, NFSX_MYFH, 0);
4165         } else if (procnum == NFSV4PROC_CBNULL) {
4166                 nd->nd_procnum = NFSV4PROC_CBNULL;
4167                 if ((clp->lc_flags & LCL_NFSV41) != 0) {
4168                         error = nfsv4_getcbsession(clp, &sep);
4169                         if (error != 0) {
4170                                 mbuf_freem(nd->nd_mreq);
4171                                 goto errout;
4172                         }
4173                 }
4174         } else {
4175                 error = NFSERR_SERVERFAULT;
4176                 mbuf_freem(nd->nd_mreq);
4177                 goto errout;
4178         }
4179
4180         /*
4181          * Call newnfs_connect(), as required, and then newnfs_request().
4182          */
4183         (void) newnfs_sndlock(&clp->lc_req.nr_lock);
4184         if (clp->lc_req.nr_client == NULL) {
4185                 if ((clp->lc_flags & LCL_NFSV41) != 0)
4186                         error = ECONNREFUSED;
4187                 else if (nd->nd_procnum == NFSV4PROC_CBNULL)
4188                         error = newnfs_connect(NULL, &clp->lc_req, cred,
4189                             NULL, 1);
4190                 else
4191                         error = newnfs_connect(NULL, &clp->lc_req, cred,
4192                             NULL, 3);
4193         }
4194         newnfs_sndunlock(&clp->lc_req.nr_lock);
4195         if (!error) {
4196                 if ((nd->nd_flag & ND_NFSV41) != 0) {
4197                         KASSERT(sep != NULL, ("sep NULL"));
4198                         if (sep->sess_cbsess.nfsess_xprt != NULL)
4199                                 error = newnfs_request(nd, NULL, clp,
4200                                     &clp->lc_req, NULL, NULL, cred,
4201                                     clp->lc_program, clp->lc_req.nr_vers, NULL,
4202                                     1, NULL, &sep->sess_cbsess);
4203                         else {
4204                                 /*
4205                                  * This should probably never occur, but if a
4206                                  * client somehow does an RPC without a
4207                                  * SequenceID Op that causes a callback just
4208                                  * after the nfsd threads have been terminated
4209                                  * and restared we could conceivably get here
4210                                  * without a backchannel xprt.
4211                                  */
4212                                 printf("nfsrv_docallback: no xprt\n");
4213                                 error = ECONNREFUSED;
4214                         }
4215                         nfsrv_freesession(sep, NULL);
4216                 } else
4217                         error = newnfs_request(nd, NULL, clp, &clp->lc_req,
4218                             NULL, NULL, cred, clp->lc_program,
4219                             clp->lc_req.nr_vers, NULL, 1, NULL, NULL);
4220         }
4221 errout:
4222         NFSFREECRED(cred);
4223
4224         /*
4225          * If error is set here, the Callback path isn't working
4226          * properly, so twiddle the appropriate LCL_ flags.
4227          * (nd_repstat != 0 indicates the Callback path is working,
4228          *  but the callback failed on the client.)
4229          */
4230         if (error) {
4231                 /*
4232                  * Mark the callback pathway down, which disabled issuing
4233                  * of delegations and gets Renew to return NFSERR_CBPATHDOWN.
4234                  */
4235                 NFSLOCKSTATE();
4236                 clp->lc_flags |= LCL_CBDOWN;
4237                 NFSUNLOCKSTATE();
4238         } else {
4239                 /*
4240                  * Callback worked. If the callback path was down, disable
4241                  * callbacks, so no more delegations will be issued. (This
4242                  * is done on the assumption that the callback pathway is
4243                  * flakey.)
4244                  */
4245                 NFSLOCKSTATE();
4246                 if (clp->lc_flags & LCL_CBDOWN)
4247                         clp->lc_flags &= ~(LCL_CBDOWN | LCL_CALLBACKSON);
4248                 NFSUNLOCKSTATE();
4249                 if (nd->nd_repstat)
4250                         error = nd->nd_repstat;
4251                 else if (error == 0 && procnum == NFSV4OP_CBGETATTR)
4252                         error = nfsv4_loadattr(nd, NULL, nap, NULL, NULL, 0,
4253                             NULL, NULL, NULL, NULL, NULL, 0, NULL, NULL, NULL,
4254                             p, NULL);
4255                 mbuf_freem(nd->nd_mrep);
4256         }
4257         NFSLOCKSTATE();
4258         clp->lc_cbref--;
4259         if ((clp->lc_flags & LCL_WAKEUPWANTED) && clp->lc_cbref == 0) {
4260                 clp->lc_flags &= ~LCL_WAKEUPWANTED;
4261                 wakeup(clp);
4262         }
4263         NFSUNLOCKSTATE();
4264
4265         NFSEXITCODE(error);
4266         return (error);
4267 }
4268
4269 /*
4270  * Set up the compound RPC for the callback.
4271  */
4272 static int
4273 nfsrv_cbcallargs(struct nfsrv_descript *nd, struct nfsclient *clp,
4274     uint32_t callback, int op, const char *optag, struct nfsdsession **sepp)
4275 {
4276         uint32_t *tl;
4277         int error, len;
4278
4279         len = strlen(optag);
4280         (void)nfsm_strtom(nd, optag, len);
4281         NFSM_BUILD(tl, uint32_t *, 4 * NFSX_UNSIGNED);
4282         if ((nd->nd_flag & ND_NFSV41) != 0) {
4283                 *tl++ = txdr_unsigned(NFSV41_MINORVERSION);
4284                 *tl++ = txdr_unsigned(callback);
4285                 *tl++ = txdr_unsigned(2);
4286                 *tl = txdr_unsigned(NFSV4OP_CBSEQUENCE);
4287                 error = nfsv4_setcbsequence(nd, clp, 1, sepp);
4288                 if (error != 0)
4289                         return (error);
4290                 NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
4291                 *tl = txdr_unsigned(op);
4292         } else {
4293                 *tl++ = txdr_unsigned(NFSV4_MINORVERSION);
4294                 *tl++ = txdr_unsigned(callback);
4295                 *tl++ = txdr_unsigned(1);
4296                 *tl = txdr_unsigned(op);
4297         }
4298         return (0);
4299 }
4300
4301 /*
4302  * Return the next index# for a clientid. Mostly just increment and return
4303  * the next one, but... if the 32bit unsigned does actually wrap around,
4304  * it should be rebooted.
4305  * At an average rate of one new client per second, it will wrap around in
4306  * approximately 136 years. (I think the server will have been shut
4307  * down or rebooted before then.)
4308  */
4309 static u_int32_t
4310 nfsrv_nextclientindex(void)
4311 {
4312         static u_int32_t client_index = 0;
4313
4314         client_index++;
4315         if (client_index != 0)
4316                 return (client_index);
4317
4318         printf("%s: out of clientids\n", __func__);
4319         return (client_index);
4320 }
4321
4322 /*
4323  * Return the next index# for a stateid. Mostly just increment and return
4324  * the next one, but... if the 32bit unsigned does actually wrap around
4325  * (will a BSD server stay up that long?), find
4326  * new start and end values.
4327  */
4328 static u_int32_t
4329 nfsrv_nextstateindex(struct nfsclient *clp)
4330 {
4331         struct nfsstate *stp;
4332         int i;
4333         u_int32_t canuse, min_index, max_index;
4334
4335         if (!(clp->lc_flags & LCL_INDEXNOTOK)) {
4336                 clp->lc_stateindex++;
4337                 if (clp->lc_stateindex != clp->lc_statemaxindex)
4338                         return (clp->lc_stateindex);
4339         }
4340
4341         /*
4342          * Yuck, we've hit the end.
4343          * Look for a new min and max.
4344          */
4345         min_index = 0;
4346         max_index = 0xffffffff;
4347         for (i = 0; i < nfsrv_statehashsize; i++) {
4348             LIST_FOREACH(stp, &clp->lc_stateid[i], ls_hash) {
4349                 if (stp->ls_stateid.other[2] > 0x80000000) {
4350                     if (stp->ls_stateid.other[2] < max_index)
4351                         max_index = stp->ls_stateid.other[2];
4352                 } else {
4353                     if (stp->ls_stateid.other[2] > min_index)
4354                         min_index = stp->ls_stateid.other[2];
4355                 }
4356             }
4357         }
4358
4359         /*
4360          * Yikes, highly unlikely, but I'll handle it anyhow.
4361          */
4362         if (min_index == 0x80000000 && max_index == 0x80000001) {
4363             canuse = 0;
4364             /*
4365              * Loop around until we find an unused entry. Return that
4366              * and set LCL_INDEXNOTOK, so the search will continue next time.
4367              * (This is one of those rare cases where a goto is the
4368              *  cleanest way to code the loop.)
4369              */
4370 tryagain:
4371             for (i = 0; i < nfsrv_statehashsize; i++) {
4372                 LIST_FOREACH(stp, &clp->lc_stateid[i], ls_hash) {
4373                     if (stp->ls_stateid.other[2] == canuse) {
4374                         canuse++;
4375                         goto tryagain;
4376                     }
4377                 }
4378             }
4379             clp->lc_flags |= LCL_INDEXNOTOK;
4380             return (canuse);
4381         }
4382
4383         /*
4384          * Ok to start again from min + 1.
4385          */
4386         clp->lc_stateindex = min_index + 1;
4387         clp->lc_statemaxindex = max_index;
4388         clp->lc_flags &= ~LCL_INDEXNOTOK;
4389         return (clp->lc_stateindex);
4390 }
4391
4392 /*
4393  * The following functions handle the stable storage file that deals with
4394  * the edge conditions described in RFC3530 Sec. 8.6.3.
4395  * The file is as follows:
4396  * - a single record at the beginning that has the lease time of the
4397  *   previous server instance (before the last reboot) and the nfsrvboottime
4398  *   values for the previous server boots.
4399  *   These previous boot times are used to ensure that the current
4400  *   nfsrvboottime does not, somehow, get set to a previous one.
4401  *   (This is important so that Stale ClientIDs and StateIDs can
4402  *    be recognized.)
4403  *   The number of previous nfsvrboottime values precedes the list.
4404  * - followed by some number of appended records with:
4405  *   - client id string
4406  *   - flag that indicates it is a record revoking state via lease
4407  *     expiration or similar
4408  *     OR has successfully acquired state.
4409  * These structures vary in length, with the client string at the end, up
4410  * to NFSV4_OPAQUELIMIT in size.
4411  *
4412  * At the end of the grace period, the file is truncated, the first
4413  * record is rewritten with updated information and any acquired state
4414  * records for successful reclaims of state are written.
4415  *
4416  * Subsequent records are appended when the first state is issued to
4417  * a client and when state is revoked for a client.
4418  *
4419  * When reading the file in, state issued records that come later in
4420  * the file override older ones, since the append log is in cronological order.
4421  * If, for some reason, the file can't be read, the grace period is
4422  * immediately terminated and all reclaims get NFSERR_NOGRACE.
4423  */
4424
4425 /*
4426  * Read in the stable storage file. Called by nfssvc() before the nfsd
4427  * processes start servicing requests.
4428  */
4429 APPLESTATIC void
4430 nfsrv_setupstable(NFSPROC_T *p)
4431 {
4432         struct nfsrv_stablefirst *sf = &nfsrv_stablefirst;
4433         struct nfsrv_stable *sp, *nsp;
4434         struct nfst_rec *tsp;
4435         int error, i, tryagain;
4436         off_t off = 0;
4437         ssize_t aresid, len;
4438
4439         /*
4440          * If NFSNSF_UPDATEDONE is set, this is a restart of the nfsds without
4441          * a reboot, so state has not been lost.
4442          */
4443         if (sf->nsf_flags & NFSNSF_UPDATEDONE)
4444                 return;
4445         /*
4446          * Set Grace over just until the file reads successfully.
4447          */
4448         nfsrvboottime = time_second;
4449         LIST_INIT(&sf->nsf_head);
4450         sf->nsf_flags = (NFSNSF_GRACEOVER | NFSNSF_NEEDLOCK);
4451         sf->nsf_eograce = NFSD_MONOSEC + NFSRV_LEASEDELTA;
4452         if (sf->nsf_fp == NULL)
4453                 return;
4454         error = NFSD_RDWR(UIO_READ, NFSFPVNODE(sf->nsf_fp),
4455             (caddr_t)&sf->nsf_rec, sizeof (struct nfsf_rec), off, UIO_SYSSPACE,
4456             0, NFSFPCRED(sf->nsf_fp), &aresid, p);
4457         if (error || aresid || sf->nsf_numboots == 0 ||
4458                 sf->nsf_numboots > NFSNSF_MAXNUMBOOTS)
4459                 return;
4460
4461         /*
4462          * Now, read in the boottimes.
4463          */
4464         sf->nsf_bootvals = (time_t *)malloc((sf->nsf_numboots + 1) *
4465                 sizeof (time_t), M_TEMP, M_WAITOK);
4466         off = sizeof (struct nfsf_rec);
4467         error = NFSD_RDWR(UIO_READ, NFSFPVNODE(sf->nsf_fp),
4468             (caddr_t)sf->nsf_bootvals, sf->nsf_numboots * sizeof (time_t), off,
4469             UIO_SYSSPACE, 0, NFSFPCRED(sf->nsf_fp), &aresid, p);
4470         if (error || aresid) {
4471                 free((caddr_t)sf->nsf_bootvals, M_TEMP);
4472                 sf->nsf_bootvals = NULL;
4473                 return;
4474         }
4475
4476         /*
4477          * Make sure this nfsrvboottime is different from all recorded
4478          * previous ones.
4479          */
4480         do {
4481                 tryagain = 0;
4482                 for (i = 0; i < sf->nsf_numboots; i++) {
4483                         if (nfsrvboottime == sf->nsf_bootvals[i]) {
4484                                 nfsrvboottime++;
4485                                 tryagain = 1;
4486                                 break;
4487                         }
4488                 }
4489         } while (tryagain);
4490
4491         sf->nsf_flags |= NFSNSF_OK;
4492         off += (sf->nsf_numboots * sizeof (time_t));
4493
4494         /*
4495          * Read through the file, building a list of records for grace
4496          * checking.
4497          * Each record is between sizeof (struct nfst_rec) and
4498          * sizeof (struct nfst_rec) + NFSV4_OPAQUELIMIT - 1
4499          * and is actually sizeof (struct nfst_rec) + nst_len - 1.
4500          */
4501         tsp = (struct nfst_rec *)malloc(sizeof (struct nfst_rec) +
4502                 NFSV4_OPAQUELIMIT - 1, M_TEMP, M_WAITOK);
4503         do {
4504             error = NFSD_RDWR(UIO_READ, NFSFPVNODE(sf->nsf_fp),
4505                 (caddr_t)tsp, sizeof (struct nfst_rec) + NFSV4_OPAQUELIMIT - 1,
4506                 off, UIO_SYSSPACE, 0, NFSFPCRED(sf->nsf_fp), &aresid, p);
4507             len = (sizeof (struct nfst_rec) + NFSV4_OPAQUELIMIT - 1) - aresid;
4508             if (error || (len > 0 && (len < sizeof (struct nfst_rec) ||
4509                 len < (sizeof (struct nfst_rec) + tsp->len - 1)))) {
4510                 /*
4511                  * Yuck, the file has been corrupted, so just return
4512                  * after clearing out any restart state, so the grace period
4513                  * is over.
4514                  */
4515                 LIST_FOREACH_SAFE(sp, &sf->nsf_head, nst_list, nsp) {
4516                         LIST_REMOVE(sp, nst_list);
4517                         free((caddr_t)sp, M_TEMP);
4518                 }
4519                 free((caddr_t)tsp, M_TEMP);
4520                 sf->nsf_flags &= ~NFSNSF_OK;
4521                 free((caddr_t)sf->nsf_bootvals, M_TEMP);
4522                 sf->nsf_bootvals = NULL;
4523                 return;
4524             }
4525             if (len > 0) {
4526                 off += sizeof (struct nfst_rec) + tsp->len - 1;
4527                 /*
4528                  * Search the list for a matching client.
4529                  */
4530                 LIST_FOREACH(sp, &sf->nsf_head, nst_list) {
4531                         if (tsp->len == sp->nst_len &&
4532                             !NFSBCMP(tsp->client, sp->nst_client, tsp->len))
4533                                 break;
4534                 }
4535                 if (sp == LIST_END(&sf->nsf_head)) {
4536                         sp = (struct nfsrv_stable *)malloc(tsp->len +
4537                                 sizeof (struct nfsrv_stable) - 1, M_TEMP,
4538                                 M_WAITOK);
4539                         NFSBCOPY((caddr_t)tsp, (caddr_t)&sp->nst_rec,
4540                                 sizeof (struct nfst_rec) + tsp->len - 1);
4541                         LIST_INSERT_HEAD(&sf->nsf_head, sp, nst_list);
4542                 } else {
4543                         if (tsp->flag == NFSNST_REVOKE)
4544                                 sp->nst_flag |= NFSNST_REVOKE;
4545                         else
4546                                 /*
4547                                  * A subsequent timestamp indicates the client
4548                                  * did a setclientid/confirm and any previous
4549                                  * revoke is no longer relevant.
4550                                  */
4551                                 sp->nst_flag &= ~NFSNST_REVOKE;
4552                 }
4553             }
4554         } while (len > 0);
4555         free((caddr_t)tsp, M_TEMP);
4556         sf->nsf_flags = NFSNSF_OK;
4557         sf->nsf_eograce = NFSD_MONOSEC + sf->nsf_lease +
4558                 NFSRV_LEASEDELTA;
4559 }
4560
4561 /*
4562  * Update the stable storage file, now that the grace period is over.
4563  */
4564 APPLESTATIC void
4565 nfsrv_updatestable(NFSPROC_T *p)
4566 {
4567         struct nfsrv_stablefirst *sf = &nfsrv_stablefirst;
4568         struct nfsrv_stable *sp, *nsp;
4569         int i;
4570         struct nfsvattr nva;
4571         vnode_t vp;
4572 #if defined(__FreeBSD_version) && (__FreeBSD_version >= 500000)
4573         mount_t mp = NULL;
4574 #endif
4575         int error;
4576
4577         if (sf->nsf_fp == NULL || (sf->nsf_flags & NFSNSF_UPDATEDONE))
4578                 return;
4579         sf->nsf_flags |= NFSNSF_UPDATEDONE;
4580         /*
4581          * Ok, we need to rewrite the stable storage file.
4582          * - truncate to 0 length
4583          * - write the new first structure
4584          * - loop through the data structures, writing out any that
4585          *   have timestamps older than the old boot
4586          */
4587         if (sf->nsf_bootvals) {
4588                 sf->nsf_numboots++;
4589                 for (i = sf->nsf_numboots - 2; i >= 0; i--)
4590                         sf->nsf_bootvals[i + 1] = sf->nsf_bootvals[i];
4591         } else {
4592                 sf->nsf_numboots = 1;
4593                 sf->nsf_bootvals = (time_t *)malloc(sizeof (time_t),
4594                         M_TEMP, M_WAITOK);
4595         }
4596         sf->nsf_bootvals[0] = nfsrvboottime;
4597         sf->nsf_lease = nfsrv_lease;
4598         NFSVNO_ATTRINIT(&nva);
4599         NFSVNO_SETATTRVAL(&nva, size, 0);
4600         vp = NFSFPVNODE(sf->nsf_fp);
4601         vn_start_write(vp, &mp, V_WAIT);
4602         if (NFSVOPLOCK(vp, LK_EXCLUSIVE) == 0) {
4603                 error = nfsvno_setattr(vp, &nva, NFSFPCRED(sf->nsf_fp), p,
4604                     NULL);
4605                 NFSVOPUNLOCK(vp, 0);
4606         } else
4607                 error = EPERM;
4608         vn_finished_write(mp);
4609         if (!error)
4610             error = NFSD_RDWR(UIO_WRITE, vp,
4611                 (caddr_t)&sf->nsf_rec, sizeof (struct nfsf_rec), (off_t)0,
4612                 UIO_SYSSPACE, IO_SYNC, NFSFPCRED(sf->nsf_fp), NULL, p);
4613         if (!error)
4614             error = NFSD_RDWR(UIO_WRITE, vp,
4615                 (caddr_t)sf->nsf_bootvals,
4616                 sf->nsf_numboots * sizeof (time_t),
4617                 (off_t)(sizeof (struct nfsf_rec)),
4618                 UIO_SYSSPACE, IO_SYNC, NFSFPCRED(sf->nsf_fp), NULL, p);
4619         free((caddr_t)sf->nsf_bootvals, M_TEMP);
4620         sf->nsf_bootvals = NULL;
4621         if (error) {
4622                 sf->nsf_flags &= ~NFSNSF_OK;
4623                 printf("EEK! Can't write NfsV4 stable storage file\n");
4624                 return;
4625         }
4626         sf->nsf_flags |= NFSNSF_OK;
4627
4628         /*
4629          * Loop through the list and write out timestamp records for
4630          * any clients that successfully reclaimed state.
4631          */
4632         LIST_FOREACH_SAFE(sp, &sf->nsf_head, nst_list, nsp) {
4633                 if (sp->nst_flag & NFSNST_GOTSTATE) {
4634                         nfsrv_writestable(sp->nst_client, sp->nst_len,
4635                                 NFSNST_NEWSTATE, p);
4636                         sp->nst_clp->lc_flags |= LCL_STAMPEDSTABLE;
4637                 }
4638                 LIST_REMOVE(sp, nst_list);
4639                 free((caddr_t)sp, M_TEMP);
4640         }
4641         nfsrv_backupstable();
4642 }
4643
4644 /*
4645  * Append a record to the stable storage file.
4646  */
4647 APPLESTATIC void
4648 nfsrv_writestable(u_char *client, int len, int flag, NFSPROC_T *p)
4649 {
4650         struct nfsrv_stablefirst *sf = &nfsrv_stablefirst;
4651         struct nfst_rec *sp;
4652         int error;
4653
4654         if (!(sf->nsf_flags & NFSNSF_OK) || sf->nsf_fp == NULL)
4655                 return;
4656         sp = (struct nfst_rec *)malloc(sizeof (struct nfst_rec) +
4657                 len - 1, M_TEMP, M_WAITOK);
4658         sp->len = len;
4659         NFSBCOPY(client, sp->client, len);
4660         sp->flag = flag;
4661         error = NFSD_RDWR(UIO_WRITE, NFSFPVNODE(sf->nsf_fp),
4662             (caddr_t)sp, sizeof (struct nfst_rec) + len - 1, (off_t)0,
4663             UIO_SYSSPACE, (IO_SYNC | IO_APPEND), NFSFPCRED(sf->nsf_fp), NULL, p);
4664         free((caddr_t)sp, M_TEMP);
4665         if (error) {
4666                 sf->nsf_flags &= ~NFSNSF_OK;
4667                 printf("EEK! Can't write NfsV4 stable storage file\n");
4668         }
4669 }
4670
4671 /*
4672  * This function is called during the grace period to mark a client
4673  * that successfully reclaimed state.
4674  */
4675 static void
4676 nfsrv_markstable(struct nfsclient *clp)
4677 {
4678         struct nfsrv_stable *sp;
4679
4680         /*
4681          * First find the client structure.
4682          */
4683         LIST_FOREACH(sp, &nfsrv_stablefirst.nsf_head, nst_list) {
4684                 if (sp->nst_len == clp->lc_idlen &&
4685                     !NFSBCMP(sp->nst_client, clp->lc_id, sp->nst_len))
4686                         break;
4687         }
4688         if (sp == LIST_END(&nfsrv_stablefirst.nsf_head))
4689                 return;
4690
4691         /*
4692          * Now, just mark it and set the nfsclient back pointer.
4693          */
4694         sp->nst_flag |= NFSNST_GOTSTATE;
4695         sp->nst_clp = clp;
4696 }
4697
4698 /*
4699  * This function is called for a reclaim, to see if it gets grace.
4700  * It returns 0 if a reclaim is allowed, 1 otherwise.
4701  */
4702 static int
4703 nfsrv_checkstable(struct nfsclient *clp)
4704 {
4705         struct nfsrv_stable *sp;
4706
4707         /*
4708          * First, find the entry for the client.
4709          */
4710         LIST_FOREACH(sp, &nfsrv_stablefirst.nsf_head, nst_list) {
4711                 if (sp->nst_len == clp->lc_idlen &&
4712                     !NFSBCMP(sp->nst_client, clp->lc_id, sp->nst_len))
4713                         break;
4714         }
4715
4716         /*
4717          * If not in the list, state was revoked or no state was issued
4718          * since the previous reboot, a reclaim is denied.
4719          */
4720         if (sp == LIST_END(&nfsrv_stablefirst.nsf_head) ||
4721             (sp->nst_flag & NFSNST_REVOKE) ||
4722             !(nfsrv_stablefirst.nsf_flags & NFSNSF_OK))
4723                 return (1);
4724         return (0);
4725 }
4726
4727 /*
4728  * Test for and try to clear out a conflicting client. This is called by
4729  * nfsrv_lockctrl() and nfsrv_openctrl() when conflicts with other clients
4730  * a found.
4731  * The trick here is that it can't revoke a conflicting client with an
4732  * expired lease unless it holds the v4root lock, so...
4733  * If no v4root lock, get the lock and return 1 to indicate "try again".
4734  * Return 0 to indicate the conflict can't be revoked and 1 to indicate
4735  * the revocation worked and the conflicting client is "bye, bye", so it
4736  * can be tried again.
4737  * Return 2 to indicate that the vnode is VI_DOOMED after NFSVOPLOCK().
4738  * Unlocks State before a non-zero value is returned.
4739  */
4740 static int
4741 nfsrv_clientconflict(struct nfsclient *clp, int *haslockp, vnode_t vp,
4742     NFSPROC_T *p)
4743 {
4744         int gotlock, lktype = 0;
4745
4746         /*
4747          * If lease hasn't expired, we can't fix it.
4748          */
4749         if (clp->lc_expiry >= NFSD_MONOSEC ||
4750             !(nfsrv_stablefirst.nsf_flags & NFSNSF_UPDATEDONE))
4751                 return (0);
4752         if (*haslockp == 0) {
4753                 NFSUNLOCKSTATE();
4754                 if (vp != NULL) {
4755                         lktype = NFSVOPISLOCKED(vp);
4756                         NFSVOPUNLOCK(vp, 0);
4757                 }
4758                 NFSLOCKV4ROOTMUTEX();
4759                 nfsv4_relref(&nfsv4rootfs_lock);
4760                 do {
4761                         gotlock = nfsv4_lock(&nfsv4rootfs_lock, 1, NULL,
4762                             NFSV4ROOTLOCKMUTEXPTR, NULL);
4763                 } while (!gotlock);
4764                 NFSUNLOCKV4ROOTMUTEX();
4765                 *haslockp = 1;
4766                 if (vp != NULL) {
4767                         NFSVOPLOCK(vp, lktype | LK_RETRY);
4768                         if ((vp->v_iflag & VI_DOOMED) != 0)
4769                                 return (2);
4770                 }
4771                 return (1);
4772         }
4773         NFSUNLOCKSTATE();
4774
4775         /*
4776          * Ok, we can expire the conflicting client.
4777          */
4778         nfsrv_writestable(clp->lc_id, clp->lc_idlen, NFSNST_REVOKE, p);
4779         nfsrv_backupstable();
4780         nfsrv_cleanclient(clp, p);
4781         nfsrv_freedeleglist(&clp->lc_deleg);
4782         nfsrv_freedeleglist(&clp->lc_olddeleg);
4783         LIST_REMOVE(clp, lc_hash);
4784         nfsrv_zapclient(clp, p);
4785         return (1);
4786 }
4787
4788 /*
4789  * Resolve a delegation conflict.
4790  * Returns 0 to indicate the conflict was resolved without sleeping.
4791  * Return -1 to indicate that the caller should check for conflicts again.
4792  * Return > 0 for an error that should be returned, normally NFSERR_DELAY.
4793  *
4794  * Also, manipulate the nfsv4root_lock, as required. It isn't changed
4795  * for a return of 0, since there was no sleep and it could be required
4796  * later. It is released for a return of NFSERR_DELAY, since the caller
4797  * will return that error. It is released when a sleep was done waiting
4798  * for the delegation to be returned or expire (so that other nfsds can
4799  * handle ops). Then, it must be acquired for the write to stable storage.
4800  * (This function is somewhat similar to nfsrv_clientconflict(), but
4801  *  the semantics differ in a couple of subtle ways. The return of 0
4802  *  indicates the conflict was resolved without sleeping here, not
4803  *  that the conflict can't be resolved and the handling of nfsv4root_lock
4804  *  differs, as noted above.)
4805  * Unlocks State before returning a non-zero value.
4806  */
4807 static int
4808 nfsrv_delegconflict(struct nfsstate *stp, int *haslockp, NFSPROC_T *p,
4809     vnode_t vp)
4810 {
4811         struct nfsclient *clp = stp->ls_clp;
4812         int gotlock, error, lktype = 0, retrycnt, zapped_clp;
4813         nfsv4stateid_t tstateid;
4814         fhandle_t tfh;
4815
4816         /*
4817          * If the conflict is with an old delegation...
4818          */
4819         if (stp->ls_flags & NFSLCK_OLDDELEG) {
4820                 /*
4821                  * You can delete it, if it has expired.
4822                  */
4823                 if (clp->lc_delegtime < NFSD_MONOSEC) {
4824                         nfsrv_freedeleg(stp);
4825                         NFSUNLOCKSTATE();
4826                         error = -1;
4827                         goto out;
4828                 }
4829                 NFSUNLOCKSTATE();
4830                 /*
4831                  * During this delay, the old delegation could expire or it
4832                  * could be recovered by the client via an Open with
4833                  * CLAIM_DELEGATE_PREV.
4834                  * Release the nfsv4root_lock, if held.
4835                  */
4836                 if (*haslockp) {
4837                         *haslockp = 0;
4838                         NFSLOCKV4ROOTMUTEX();
4839                         nfsv4_unlock(&nfsv4rootfs_lock, 1);
4840                         NFSUNLOCKV4ROOTMUTEX();
4841                 }
4842                 error = NFSERR_DELAY;
4843                 goto out;
4844         }
4845
4846         /*
4847          * It's a current delegation, so:
4848          * - check to see if the delegation has expired
4849          *   - if so, get the v4root lock and then expire it
4850          */
4851         if (!(stp->ls_flags & NFSLCK_DELEGRECALL)) {
4852                 /*
4853                  * - do a recall callback, since not yet done
4854                  * For now, never allow truncate to be set. To use
4855                  * truncate safely, it must be guaranteed that the
4856                  * Remove, Rename or Setattr with size of 0 will
4857                  * succeed and that would require major changes to
4858                  * the VFS/Vnode OPs.
4859                  * Set the expiry time large enough so that it won't expire
4860                  * until after the callback, then set it correctly, once
4861                  * the callback is done. (The delegation will now time
4862                  * out whether or not the Recall worked ok. The timeout
4863                  * will be extended when ops are done on the delegation
4864                  * stateid, up to the timelimit.)
4865                  */
4866                 stp->ls_delegtime = NFSD_MONOSEC + (2 * nfsrv_lease) +
4867                     NFSRV_LEASEDELTA;
4868                 stp->ls_delegtimelimit = NFSD_MONOSEC + (6 * nfsrv_lease) +
4869                     NFSRV_LEASEDELTA;
4870                 stp->ls_flags |= NFSLCK_DELEGRECALL;
4871
4872                 /*
4873                  * Loop NFSRV_CBRETRYCNT times while the CBRecall replies
4874                  * NFSERR_BADSTATEID or NFSERR_BADHANDLE. This is done
4875                  * in order to try and avoid a race that could happen
4876                  * when a CBRecall request passed the Open reply with
4877                  * the delegation in it when transitting the network.
4878                  * Since nfsrv_docallback will sleep, don't use stp after
4879                  * the call.
4880                  */
4881                 NFSBCOPY((caddr_t)&stp->ls_stateid, (caddr_t)&tstateid,
4882                     sizeof (tstateid));
4883                 NFSBCOPY((caddr_t)&stp->ls_lfp->lf_fh, (caddr_t)&tfh,
4884                     sizeof (tfh));
4885                 NFSUNLOCKSTATE();
4886                 if (*haslockp) {
4887                         *haslockp = 0;
4888                         NFSLOCKV4ROOTMUTEX();
4889                         nfsv4_unlock(&nfsv4rootfs_lock, 1);
4890                         NFSUNLOCKV4ROOTMUTEX();
4891                 }
4892                 retrycnt = 0;
4893                 do {
4894                     error = nfsrv_docallback(clp, NFSV4OP_CBRECALL,
4895                         &tstateid, 0, &tfh, NULL, NULL, p);
4896                     retrycnt++;
4897                 } while ((error == NFSERR_BADSTATEID ||
4898                     error == NFSERR_BADHANDLE) && retrycnt < NFSV4_CBRETRYCNT);
4899                 error = NFSERR_DELAY;
4900                 goto out;
4901         }
4902
4903         if (clp->lc_expiry >= NFSD_MONOSEC &&
4904             stp->ls_delegtime >= NFSD_MONOSEC) {
4905                 NFSUNLOCKSTATE();
4906                 /*
4907                  * A recall has been done, but it has not yet expired.
4908                  * So, RETURN_DELAY.
4909                  */
4910                 if (*haslockp) {
4911                         *haslockp = 0;
4912                         NFSLOCKV4ROOTMUTEX();
4913                         nfsv4_unlock(&nfsv4rootfs_lock, 1);
4914                         NFSUNLOCKV4ROOTMUTEX();
4915                 }
4916                 error = NFSERR_DELAY;
4917                 goto out;
4918         }
4919
4920         /*
4921          * If we don't yet have the lock, just get it and then return,
4922          * since we need that before deleting expired state, such as
4923          * this delegation.
4924          * When getting the lock, unlock the vnode, so other nfsds that
4925          * are in progress, won't get stuck waiting for the vnode lock.
4926          */
4927         if (*haslockp == 0) {
4928                 NFSUNLOCKSTATE();
4929                 if (vp != NULL) {
4930                         lktype = NFSVOPISLOCKED(vp);
4931                         NFSVOPUNLOCK(vp, 0);
4932                 }
4933                 NFSLOCKV4ROOTMUTEX();
4934                 nfsv4_relref(&nfsv4rootfs_lock);
4935                 do {
4936                         gotlock = nfsv4_lock(&nfsv4rootfs_lock, 1, NULL,
4937                             NFSV4ROOTLOCKMUTEXPTR, NULL);
4938                 } while (!gotlock);
4939                 NFSUNLOCKV4ROOTMUTEX();
4940                 *haslockp = 1;
4941                 if (vp != NULL) {
4942                         NFSVOPLOCK(vp, lktype | LK_RETRY);
4943                         if ((vp->v_iflag & VI_DOOMED) != 0) {
4944                                 *haslockp = 0;
4945                                 NFSLOCKV4ROOTMUTEX();
4946                                 nfsv4_unlock(&nfsv4rootfs_lock, 1);
4947                                 NFSUNLOCKV4ROOTMUTEX();
4948                                 error = NFSERR_PERM;
4949                                 goto out;
4950                         }
4951                 }
4952                 error = -1;
4953                 goto out;
4954         }
4955
4956         NFSUNLOCKSTATE();
4957         /*
4958          * Ok, we can delete the expired delegation.
4959          * First, write the Revoke record to stable storage and then
4960          * clear out the conflict.
4961          * Since all other nfsd threads are now blocked, we can safely
4962          * sleep without the state changing.
4963          */
4964         nfsrv_writestable(clp->lc_id, clp->lc_idlen, NFSNST_REVOKE, p);
4965         nfsrv_backupstable();
4966         if (clp->lc_expiry < NFSD_MONOSEC) {
4967                 nfsrv_cleanclient(clp, p);
4968                 nfsrv_freedeleglist(&clp->lc_deleg);
4969                 nfsrv_freedeleglist(&clp->lc_olddeleg);
4970                 LIST_REMOVE(clp, lc_hash);
4971                 zapped_clp = 1;
4972         } else {
4973                 nfsrv_freedeleg(stp);
4974                 zapped_clp = 0;
4975         }
4976         if (zapped_clp)
4977                 nfsrv_zapclient(clp, p);
4978         error = -1;
4979
4980 out:
4981         NFSEXITCODE(error);
4982         return (error);
4983 }
4984
4985 /*
4986  * Check for a remove allowed, if remove is set to 1 and get rid of
4987  * delegations.
4988  */
4989 APPLESTATIC int
4990 nfsrv_checkremove(vnode_t vp, int remove, NFSPROC_T *p)
4991 {
4992         struct nfsstate *stp;
4993         struct nfslockfile *lfp;
4994         int error, haslock = 0;
4995         fhandle_t nfh;
4996
4997         /*
4998          * First, get the lock file structure.
4999          * (A return of -1 means no associated state, so remove ok.)
5000          */
5001         error = nfsrv_getlockfh(vp, NFSLCK_CHECK, NULL, &nfh, p);
5002 tryagain:
5003         NFSLOCKSTATE();
5004         if (!error)
5005                 error = nfsrv_getlockfile(NFSLCK_CHECK, NULL, &lfp, &nfh, 0);
5006         if (error) {
5007                 NFSUNLOCKSTATE();
5008                 if (haslock) {
5009                         NFSLOCKV4ROOTMUTEX();
5010                         nfsv4_unlock(&nfsv4rootfs_lock, 1);
5011                         NFSUNLOCKV4ROOTMUTEX();
5012                 }
5013                 if (error == -1)
5014                         error = 0;
5015                 goto out;
5016         }
5017
5018         /*
5019          * Now, we must Recall any delegations.
5020          */
5021         error = nfsrv_cleandeleg(vp, lfp, NULL, &haslock, p);
5022         if (error) {
5023                 /*
5024                  * nfsrv_cleandeleg() unlocks state for non-zero
5025                  * return.
5026                  */
5027                 if (error == -1)
5028                         goto tryagain;
5029                 if (haslock) {
5030                         NFSLOCKV4ROOTMUTEX();
5031                         nfsv4_unlock(&nfsv4rootfs_lock, 1);
5032                         NFSUNLOCKV4ROOTMUTEX();
5033                 }
5034                 goto out;
5035         }
5036
5037         /*
5038          * Now, look for a conflicting open share.
5039          */
5040         if (remove) {
5041                 /*
5042                  * If the entry in the directory was the last reference to the
5043                  * corresponding filesystem object, the object can be destroyed
5044                  * */
5045                 if(lfp->lf_usecount>1)
5046                         LIST_FOREACH(stp, &lfp->lf_open, ls_file) {
5047                                 if (stp->ls_flags & NFSLCK_WRITEDENY) {
5048                                         error = NFSERR_FILEOPEN;
5049                                         break;
5050                                 }
5051                         }
5052         }
5053
5054         NFSUNLOCKSTATE();
5055         if (haslock) {
5056                 NFSLOCKV4ROOTMUTEX();
5057                 nfsv4_unlock(&nfsv4rootfs_lock, 1);
5058                 NFSUNLOCKV4ROOTMUTEX();
5059         }
5060
5061 out:
5062         NFSEXITCODE(error);
5063         return (error);
5064 }
5065
5066 /*
5067  * Clear out all delegations for the file referred to by lfp.
5068  * May return NFSERR_DELAY, if there will be a delay waiting for
5069  * delegations to expire.
5070  * Returns -1 to indicate it slept while recalling a delegation.
5071  * This function has the side effect of deleting the nfslockfile structure,
5072  * if it no longer has associated state and didn't have to sleep.
5073  * Unlocks State before a non-zero value is returned.
5074  */
5075 static int
5076 nfsrv_cleandeleg(vnode_t vp, struct nfslockfile *lfp,
5077     struct nfsclient *clp, int *haslockp, NFSPROC_T *p)
5078 {
5079         struct nfsstate *stp, *nstp;
5080         int ret = 0;
5081
5082         stp = LIST_FIRST(&lfp->lf_deleg);
5083         while (stp != LIST_END(&lfp->lf_deleg)) {
5084                 nstp = LIST_NEXT(stp, ls_file);
5085                 if (stp->ls_clp != clp) {
5086                         ret = nfsrv_delegconflict(stp, haslockp, p, vp);
5087                         if (ret) {
5088                                 /*
5089                                  * nfsrv_delegconflict() unlocks state
5090                                  * when it returns non-zero.
5091                                  */
5092                                 goto out;
5093                         }
5094                 }
5095                 stp = nstp;
5096         }
5097 out:
5098         NFSEXITCODE(ret);
5099         return (ret);
5100 }
5101
5102 /*
5103  * There are certain operations that, when being done outside of NFSv4,
5104  * require that any NFSv4 delegation for the file be recalled.
5105  * This function is to be called for those cases:
5106  * VOP_RENAME() - When a delegation is being recalled for any reason,
5107  *      the client may have to do Opens against the server, using the file's
5108  *      final component name. If the file has been renamed on the server,
5109  *      that component name will be incorrect and the Open will fail.
5110  * VOP_REMOVE() - Theoretically, a client could Open a file after it has
5111  *      been removed on the server, if there is a delegation issued to
5112  *      that client for the file. I say "theoretically" since clients
5113  *      normally do an Access Op before the Open and that Access Op will
5114  *      fail with ESTALE. Note that NFSv2 and 3 don't even do Opens, so
5115  *      they will detect the file's removal in the same manner. (There is
5116  *      one case where RFC3530 allows a client to do an Open without first
5117  *      doing an Access Op, which is passage of a check against the ACE
5118  *      returned with a Write delegation, but current practice is to ignore
5119  *      the ACE and always do an Access Op.)
5120  *      Since the functions can only be called with an unlocked vnode, this
5121  *      can't be done at this time.
5122  * VOP_ADVLOCK() - When a client holds a delegation, it can issue byte range
5123  *      locks locally in the client, which are not visible to the server. To
5124  *      deal with this, issuing of delegations for a vnode must be disabled
5125  *      and all delegations for the vnode recalled. This is done via the
5126  *      second function, using the VV_DISABLEDELEG vflag on the vnode.
5127  */
5128 APPLESTATIC void
5129 nfsd_recalldelegation(vnode_t vp, NFSPROC_T *p)
5130 {
5131         time_t starttime;
5132         int error;
5133
5134         /*
5135          * First, check to see if the server is currently running and it has
5136          * been called for a regular file when issuing delegations.
5137          */
5138         if (newnfs_numnfsd == 0 || vp->v_type != VREG ||
5139             nfsrv_issuedelegs == 0)
5140                 return;
5141
5142         KASSERT((NFSVOPISLOCKED(vp) != LK_EXCLUSIVE), ("vp %p is locked", vp));
5143         /*
5144          * First, get a reference on the nfsv4rootfs_lock so that an
5145          * exclusive lock cannot be acquired by another thread.
5146          */
5147         NFSLOCKV4ROOTMUTEX();
5148         nfsv4_getref(&nfsv4rootfs_lock, NULL, NFSV4ROOTLOCKMUTEXPTR, NULL);
5149         NFSUNLOCKV4ROOTMUTEX();
5150
5151         /*
5152          * Now, call nfsrv_checkremove() in a loop while it returns
5153          * NFSERR_DELAY. Return upon any other error or when timed out.
5154          */
5155         starttime = NFSD_MONOSEC;
5156         do {
5157                 if (NFSVOPLOCK(vp, LK_EXCLUSIVE) == 0) {
5158                         error = nfsrv_checkremove(vp, 0, p);
5159                         NFSVOPUNLOCK(vp, 0);
5160                 } else
5161                         error = EPERM;
5162                 if (error == NFSERR_DELAY) {
5163                         if (NFSD_MONOSEC - starttime > NFS_REMOVETIMEO)
5164                                 break;
5165                         /* Sleep for a short period of time */
5166                         (void) nfs_catnap(PZERO, 0, "nfsremove");
5167                 }
5168         } while (error == NFSERR_DELAY);
5169         NFSLOCKV4ROOTMUTEX();
5170         nfsv4_relref(&nfsv4rootfs_lock);
5171         NFSUNLOCKV4ROOTMUTEX();
5172 }
5173
5174 APPLESTATIC void
5175 nfsd_disabledelegation(vnode_t vp, NFSPROC_T *p)
5176 {
5177
5178 #ifdef VV_DISABLEDELEG
5179         /*
5180          * First, flag issuance of delegations disabled.
5181          */
5182         atomic_set_long(&vp->v_vflag, VV_DISABLEDELEG);
5183 #endif
5184
5185         /*
5186          * Then call nfsd_recalldelegation() to get rid of all extant
5187          * delegations.
5188          */
5189         nfsd_recalldelegation(vp, p);
5190 }
5191
5192 /*
5193  * Check for conflicting locks, etc. and then get rid of delegations.
5194  * (At one point I thought that I should get rid of delegations for any
5195  *  Setattr, since it could potentially disallow the I/O op (read or write)
5196  *  allowed by the delegation. However, Setattr Ops that aren't changing
5197  *  the size get a stateid of all 0s, so you can't tell if it is a delegation
5198  *  for the same client or a different one, so I decided to only get rid
5199  *  of delegations for other clients when the size is being changed.)
5200  * In general, a Setattr can disable NFS I/O Ops that are outstanding, such
5201  * as Write backs, even if there is no delegation, so it really isn't any
5202  * different?)
5203  */
5204 APPLESTATIC int
5205 nfsrv_checksetattr(vnode_t vp, struct nfsrv_descript *nd,
5206     nfsv4stateid_t *stateidp, struct nfsvattr *nvap, nfsattrbit_t *attrbitp,
5207     struct nfsexstuff *exp, NFSPROC_T *p)
5208 {
5209         struct nfsstate st, *stp = &st;
5210         struct nfslock lo, *lop = &lo;
5211         int error = 0;
5212         nfsquad_t clientid;
5213
5214         if (NFSISSET_ATTRBIT(attrbitp, NFSATTRBIT_SIZE)) {
5215                 stp->ls_flags = (NFSLCK_CHECK | NFSLCK_WRITEACCESS);
5216                 lop->lo_first = nvap->na_size;
5217         } else {
5218                 stp->ls_flags = 0;
5219                 lop->lo_first = 0;
5220         }
5221         if (NFSISSET_ATTRBIT(attrbitp, NFSATTRBIT_OWNER) ||
5222             NFSISSET_ATTRBIT(attrbitp, NFSATTRBIT_OWNERGROUP) ||
5223             NFSISSET_ATTRBIT(attrbitp, NFSATTRBIT_MODE) ||
5224             NFSISSET_ATTRBIT(attrbitp, NFSATTRBIT_ACL))
5225                 stp->ls_flags |= NFSLCK_SETATTR;
5226         if (stp->ls_flags == 0)
5227                 goto out;
5228         lop->lo_end = NFS64BITSSET;
5229         lop->lo_flags = NFSLCK_WRITE;
5230         stp->ls_ownerlen = 0;
5231         stp->ls_op = NULL;
5232         stp->ls_uid = nd->nd_cred->cr_uid;
5233         stp->ls_stateid.seqid = stateidp->seqid;
5234         clientid.lval[0] = stp->ls_stateid.other[0] = stateidp->other[0];
5235         clientid.lval[1] = stp->ls_stateid.other[1] = stateidp->other[1];
5236         stp->ls_stateid.other[2] = stateidp->other[2];
5237         error = nfsrv_lockctrl(vp, &stp, &lop, NULL, clientid,
5238             stateidp, exp, nd, p);
5239
5240 out:
5241         NFSEXITCODE2(error, nd);
5242         return (error);
5243 }
5244
5245 /*
5246  * Check for a write delegation and do a CBGETATTR if there is one, updating
5247  * the attributes, as required.
5248  * Should I return an error if I can't get the attributes? (For now, I'll
5249  * just return ok.
5250  */
5251 APPLESTATIC int
5252 nfsrv_checkgetattr(struct nfsrv_descript *nd, vnode_t vp,
5253     struct nfsvattr *nvap, nfsattrbit_t *attrbitp, struct ucred *cred,
5254     NFSPROC_T *p)
5255 {
5256         struct nfsstate *stp;
5257         struct nfslockfile *lfp;
5258         struct nfsclient *clp;
5259         struct nfsvattr nva;
5260         fhandle_t nfh;
5261         int error = 0;
5262         nfsattrbit_t cbbits;
5263         u_quad_t delegfilerev;
5264
5265         NFSCBGETATTR_ATTRBIT(attrbitp, &cbbits);
5266         if (!NFSNONZERO_ATTRBIT(&cbbits))
5267                 goto out;
5268
5269         /*
5270          * Get the lock file structure.
5271          * (A return of -1 means no associated state, so return ok.)
5272          */
5273         error = nfsrv_getlockfh(vp, NFSLCK_CHECK, NULL, &nfh, p);
5274         NFSLOCKSTATE();
5275         if (!error)
5276                 error = nfsrv_getlockfile(NFSLCK_CHECK, NULL, &lfp, &nfh, 0);
5277         if (error) {
5278                 NFSUNLOCKSTATE();
5279                 if (error == -1)
5280                         error = 0;
5281                 goto out;
5282         }
5283
5284         /*
5285          * Now, look for a write delegation.
5286          */
5287         LIST_FOREACH(stp, &lfp->lf_deleg, ls_file) {
5288                 if (stp->ls_flags & NFSLCK_DELEGWRITE)
5289                         break;
5290         }
5291         if (stp == LIST_END(&lfp->lf_deleg)) {
5292                 NFSUNLOCKSTATE();
5293                 goto out;
5294         }
5295         clp = stp->ls_clp;
5296         delegfilerev = stp->ls_filerev;
5297
5298         /*
5299          * If the Write delegation was issued as a part of this Compound RPC
5300          * or if we have an Implied Clientid (used in a previous Op in this
5301          * compound) and it is the client the delegation was issued to,
5302          * just return ok.
5303          * I also assume that it is from the same client iff the network
5304          * host IP address is the same as the callback address. (Not
5305          * exactly correct by the RFC, but avoids a lot of Getattr
5306          * callbacks.)
5307          */
5308         if (nd->nd_compref == stp->ls_compref ||
5309             ((nd->nd_flag & ND_IMPLIEDCLID) &&
5310              clp->lc_clientid.qval == nd->nd_clientid.qval) ||
5311              nfsaddr2_match(clp->lc_req.nr_nam, nd->nd_nam)) {
5312                 NFSUNLOCKSTATE();
5313                 goto out;
5314         }
5315
5316         /*
5317          * We are now done with the delegation state structure,
5318          * so the statelock can be released and we can now tsleep().
5319          */
5320
5321         /*
5322          * Now, we must do the CB Getattr callback, to see if Change or Size
5323          * has changed.
5324          */
5325         if (clp->lc_expiry >= NFSD_MONOSEC) {
5326                 NFSUNLOCKSTATE();
5327                 NFSVNO_ATTRINIT(&nva);
5328                 nva.na_filerev = NFS64BITSSET;
5329                 error = nfsrv_docallback(clp, NFSV4OP_CBGETATTR, NULL,
5330                     0, &nfh, &nva, &cbbits, p);
5331                 if (!error) {
5332                         if ((nva.na_filerev != NFS64BITSSET &&
5333                             nva.na_filerev > delegfilerev) ||
5334                             (NFSVNO_ISSETSIZE(&nva) &&
5335                              nva.na_size != nvap->na_size)) {
5336                                 error = nfsvno_updfilerev(vp, nvap, cred, p);
5337                                 if (NFSVNO_ISSETSIZE(&nva))
5338                                         nvap->na_size = nva.na_size;
5339                         }
5340                 } else
5341                         error = 0;      /* Ignore callback errors for now. */
5342         } else {
5343                 NFSUNLOCKSTATE();
5344         }
5345
5346 out:
5347         NFSEXITCODE2(error, nd);
5348         return (error);
5349 }
5350
5351 /*
5352  * This function looks for openowners that haven't had any opens for
5353  * a while and throws them away. Called by an nfsd when NFSNSF_NOOPENS
5354  * is set.
5355  */
5356 APPLESTATIC void
5357 nfsrv_throwawayopens(NFSPROC_T *p)
5358 {
5359         struct nfsclient *clp, *nclp;
5360         struct nfsstate *stp, *nstp;
5361         int i;
5362
5363         NFSLOCKSTATE();
5364         nfsrv_stablefirst.nsf_flags &= ~NFSNSF_NOOPENS;
5365         /*
5366          * For each client...
5367          */
5368         for (i = 0; i < nfsrv_clienthashsize; i++) {
5369             LIST_FOREACH_SAFE(clp, &nfsclienthash[i], lc_hash, nclp) {
5370                 LIST_FOREACH_SAFE(stp, &clp->lc_open, ls_list, nstp) {
5371                         if (LIST_EMPTY(&stp->ls_open) &&
5372                             (stp->ls_noopens > NFSNOOPEN ||
5373                              (nfsrv_openpluslock * 2) >
5374                              nfsrv_v4statelimit))
5375                                 nfsrv_freeopenowner(stp, 0, p);
5376                 }
5377             }
5378         }
5379         NFSUNLOCKSTATE();
5380 }
5381
5382 /*
5383  * This function checks to see if the credentials are the same.
5384  * Returns 1 for not same, 0 otherwise.
5385  */
5386 static int
5387 nfsrv_notsamecredname(struct nfsrv_descript *nd, struct nfsclient *clp)
5388 {
5389
5390         if (nd->nd_flag & ND_GSS) {
5391                 if (!(clp->lc_flags & LCL_GSS))
5392                         return (1);
5393                 if (clp->lc_flags & LCL_NAME) {
5394                         if (nd->nd_princlen != clp->lc_namelen ||
5395                             NFSBCMP(nd->nd_principal, clp->lc_name,
5396                                 clp->lc_namelen))
5397                                 return (1);
5398                         else
5399                                 return (0);
5400                 }
5401                 if (nd->nd_cred->cr_uid == clp->lc_uid)
5402                         return (0);
5403                 else
5404                         return (1);
5405         } else if (clp->lc_flags & LCL_GSS)
5406                 return (1);
5407         /*
5408          * For AUTH_SYS, allow the same uid or root. (This is underspecified
5409          * in RFC3530, which talks about principals, but doesn't say anything
5410          * about uids for AUTH_SYS.)
5411          */
5412         if (nd->nd_cred->cr_uid == clp->lc_uid || nd->nd_cred->cr_uid == 0)
5413                 return (0);
5414         else
5415                 return (1);
5416 }
5417
5418 /*
5419  * Calculate the lease expiry time.
5420  */
5421 static time_t
5422 nfsrv_leaseexpiry(void)
5423 {
5424
5425         if (nfsrv_stablefirst.nsf_eograce > NFSD_MONOSEC)
5426                 return (NFSD_MONOSEC + 2 * (nfsrv_lease + NFSRV_LEASEDELTA));
5427         return (NFSD_MONOSEC + nfsrv_lease + NFSRV_LEASEDELTA);
5428 }
5429
5430 /*
5431  * Delay the delegation timeout as far as ls_delegtimelimit, as required.
5432  */
5433 static void
5434 nfsrv_delaydelegtimeout(struct nfsstate *stp)
5435 {
5436
5437         if ((stp->ls_flags & NFSLCK_DELEGRECALL) == 0)
5438                 return;
5439
5440         if ((stp->ls_delegtime + 15) > NFSD_MONOSEC &&
5441             stp->ls_delegtime < stp->ls_delegtimelimit) {
5442                 stp->ls_delegtime += nfsrv_lease;
5443                 if (stp->ls_delegtime > stp->ls_delegtimelimit)
5444                         stp->ls_delegtime = stp->ls_delegtimelimit;
5445         }
5446 }
5447
5448 /*
5449  * This function checks to see if there is any other state associated
5450  * with the openowner for this Open.
5451  * It returns 1 if there is no other state, 0 otherwise.
5452  */
5453 static int
5454 nfsrv_nootherstate(struct nfsstate *stp)
5455 {
5456         struct nfsstate *tstp;
5457
5458         LIST_FOREACH(tstp, &stp->ls_openowner->ls_open, ls_list) {
5459                 if (tstp != stp || !LIST_EMPTY(&tstp->ls_lock))
5460                         return (0);
5461         }
5462         return (1);
5463 }
5464
5465 /*
5466  * Create a list of lock deltas (changes to local byte range locking
5467  * that can be rolled back using the list) and apply the changes via
5468  * nfsvno_advlock(). Optionally, lock the list. It is expected that either
5469  * the rollback or update function will be called after this.
5470  * It returns an error (and rolls back, as required), if any nfsvno_advlock()
5471  * call fails. If it returns an error, it will unlock the list.
5472  */
5473 static int
5474 nfsrv_locallock(vnode_t vp, struct nfslockfile *lfp, int flags,
5475     uint64_t first, uint64_t end, struct nfslockconflict *cfp, NFSPROC_T *p)
5476 {
5477         struct nfslock *lop, *nlop;
5478         int error = 0;
5479
5480         /* Loop through the list of locks. */
5481         lop = LIST_FIRST(&lfp->lf_locallock);
5482         while (first < end && lop != NULL) {
5483                 nlop = LIST_NEXT(lop, lo_lckowner);
5484                 if (first >= lop->lo_end) {
5485                         /* not there yet */
5486                         lop = nlop;
5487                 } else if (first < lop->lo_first) {
5488                         /* new one starts before entry in list */
5489                         if (end <= lop->lo_first) {
5490                                 /* no overlap between old and new */
5491                                 error = nfsrv_dolocal(vp, lfp, flags,
5492                                     NFSLCK_UNLOCK, first, end, cfp, p);
5493                                 if (error != 0)
5494                                         break;
5495                                 first = end;
5496                         } else {
5497                                 /* handle fragment overlapped with new one */
5498                                 error = nfsrv_dolocal(vp, lfp, flags,
5499                                     NFSLCK_UNLOCK, first, lop->lo_first, cfp,
5500                                     p);
5501                                 if (error != 0)
5502                                         break;
5503                                 first = lop->lo_first;
5504                         }
5505                 } else {
5506                         /* new one overlaps this entry in list */
5507                         if (end <= lop->lo_end) {
5508                                 /* overlaps all of new one */
5509                                 error = nfsrv_dolocal(vp, lfp, flags,
5510                                     lop->lo_flags, first, end, cfp, p);
5511                                 if (error != 0)
5512                                         break;
5513                                 first = end;
5514                         } else {
5515                                 /* handle fragment overlapped with new one */
5516                                 error = nfsrv_dolocal(vp, lfp, flags,
5517                                     lop->lo_flags, first, lop->lo_end, cfp, p);
5518                                 if (error != 0)
5519                                         break;
5520                                 first = lop->lo_end;
5521                                 lop = nlop;
5522                         }
5523                 }
5524         }
5525         if (first < end && error == 0)
5526                 /* handle fragment past end of list */
5527                 error = nfsrv_dolocal(vp, lfp, flags, NFSLCK_UNLOCK, first,
5528                     end, cfp, p);
5529
5530         NFSEXITCODE(error);
5531         return (error);
5532 }
5533
5534 /*
5535  * Local lock unlock. Unlock all byte ranges that are no longer locked
5536  * by NFSv4. To do this, unlock any subranges of first-->end that
5537  * do not overlap with the byte ranges of any lock in the lfp->lf_lock
5538  * list. This list has all locks for the file held by other
5539  * <clientid, lockowner> tuples. The list is ordered by increasing
5540  * lo_first value, but may have entries that overlap each other, for
5541  * the case of read locks.
5542  */
5543 static void
5544 nfsrv_localunlock(vnode_t vp, struct nfslockfile *lfp, uint64_t init_first,
5545     uint64_t init_end, NFSPROC_T *p)
5546 {
5547         struct nfslock *lop;
5548         uint64_t first, end, prevfirst;
5549
5550         first = init_first;
5551         end = init_end;
5552         while (first < init_end) {
5553                 /* Loop through all nfs locks, adjusting first and end */
5554                 prevfirst = 0;
5555                 LIST_FOREACH(lop, &lfp->lf_lock, lo_lckfile) {
5556                         KASSERT(prevfirst <= lop->lo_first,
5557                             ("nfsv4 locks out of order"));
5558                         KASSERT(lop->lo_first < lop->lo_end,
5559                             ("nfsv4 bogus lock"));
5560                         prevfirst = lop->lo_first;
5561                         if (first >= lop->lo_first &&
5562                             first < lop->lo_end)
5563                                 /*
5564                                  * Overlaps with initial part, so trim
5565                                  * off that initial part by moving first past
5566                                  * it.
5567                                  */
5568                                 first = lop->lo_end;
5569                         else if (end > lop->lo_first &&
5570                             lop->lo_first > first) {
5571                                 /*
5572                                  * This lock defines the end of the
5573                                  * segment to unlock, so set end to the
5574                                  * start of it and break out of the loop.
5575                                  */
5576                                 end = lop->lo_first;
5577                                 break;
5578                         }
5579                         if (first >= end)
5580                                 /*
5581                                  * There is no segment left to do, so
5582                                  * break out of this loop and then exit
5583                                  * the outer while() since first will be set
5584                                  * to end, which must equal init_end here.
5585                                  */
5586                                 break;
5587                 }
5588                 if (first < end) {
5589                         /* Unlock this segment */
5590                         (void) nfsrv_dolocal(vp, lfp, NFSLCK_UNLOCK,
5591                             NFSLCK_READ, first, end, NULL, p);
5592                         nfsrv_locallock_commit(lfp, NFSLCK_UNLOCK,
5593                             first, end);
5594                 }
5595                 /*
5596                  * Now move past this segment and look for any further
5597                  * segment in the range, if there is one.
5598                  */
5599                 first = end;
5600                 end = init_end;
5601         }
5602 }
5603
5604 /*
5605  * Do the local lock operation and update the rollback list, as required.
5606  * Perform the rollback and return the error if nfsvno_advlock() fails.
5607  */
5608 static int
5609 nfsrv_dolocal(vnode_t vp, struct nfslockfile *lfp, int flags, int oldflags,
5610     uint64_t first, uint64_t end, struct nfslockconflict *cfp, NFSPROC_T *p)
5611 {
5612         struct nfsrollback *rlp;
5613         int error = 0, ltype, oldltype;
5614
5615         if (flags & NFSLCK_WRITE)
5616                 ltype = F_WRLCK;
5617         else if (flags & NFSLCK_READ)
5618                 ltype = F_RDLCK;
5619         else
5620                 ltype = F_UNLCK;
5621         if (oldflags & NFSLCK_WRITE)
5622                 oldltype = F_WRLCK;
5623         else if (oldflags & NFSLCK_READ)
5624                 oldltype = F_RDLCK;
5625         else
5626                 oldltype = F_UNLCK;
5627         if (ltype == oldltype || (oldltype == F_WRLCK && ltype == F_RDLCK))
5628                 /* nothing to do */
5629                 goto out;
5630         error = nfsvno_advlock(vp, ltype, first, end, p);
5631         if (error != 0) {
5632                 if (cfp != NULL) {
5633                         cfp->cl_clientid.lval[0] = 0;
5634                         cfp->cl_clientid.lval[1] = 0;
5635                         cfp->cl_first = 0;
5636                         cfp->cl_end = NFS64BITSSET;
5637                         cfp->cl_flags = NFSLCK_WRITE;
5638                         cfp->cl_ownerlen = 5;
5639                         NFSBCOPY("LOCAL", cfp->cl_owner, 5);
5640                 }
5641                 nfsrv_locallock_rollback(vp, lfp, p);
5642         } else if (ltype != F_UNLCK) {
5643                 rlp = malloc(sizeof (struct nfsrollback), M_NFSDROLLBACK,
5644                     M_WAITOK);
5645                 rlp->rlck_first = first;
5646                 rlp->rlck_end = end;
5647                 rlp->rlck_type = oldltype;
5648                 LIST_INSERT_HEAD(&lfp->lf_rollback, rlp, rlck_list);
5649         }
5650
5651 out:
5652         NFSEXITCODE(error);
5653         return (error);
5654 }
5655
5656 /*
5657  * Roll back local lock changes and free up the rollback list.
5658  */
5659 static void
5660 nfsrv_locallock_rollback(vnode_t vp, struct nfslockfile *lfp, NFSPROC_T *p)
5661 {
5662         struct nfsrollback *rlp, *nrlp;
5663
5664         LIST_FOREACH_SAFE(rlp, &lfp->lf_rollback, rlck_list, nrlp) {
5665                 (void) nfsvno_advlock(vp, rlp->rlck_type, rlp->rlck_first,
5666                     rlp->rlck_end, p);
5667                 free(rlp, M_NFSDROLLBACK);
5668         }
5669         LIST_INIT(&lfp->lf_rollback);
5670 }
5671
5672 /*
5673  * Update local lock list and delete rollback list (ie now committed to the
5674  * local locks). Most of the work is done by the internal function.
5675  */
5676 static void
5677 nfsrv_locallock_commit(struct nfslockfile *lfp, int flags, uint64_t first,
5678     uint64_t end)
5679 {
5680         struct nfsrollback *rlp, *nrlp;
5681         struct nfslock *new_lop, *other_lop;
5682
5683         new_lop = malloc(sizeof (struct nfslock), M_NFSDLOCK, M_WAITOK);
5684         if (flags & (NFSLCK_READ | NFSLCK_WRITE))
5685                 other_lop = malloc(sizeof (struct nfslock), M_NFSDLOCK,
5686                     M_WAITOK);
5687         else
5688                 other_lop = NULL;
5689         new_lop->lo_flags = flags;
5690         new_lop->lo_first = first;
5691         new_lop->lo_end = end;
5692         nfsrv_updatelock(NULL, &new_lop, &other_lop, lfp);
5693         if (new_lop != NULL)
5694                 free(new_lop, M_NFSDLOCK);
5695         if (other_lop != NULL)
5696                 free(other_lop, M_NFSDLOCK);
5697
5698         /* and get rid of the rollback list */
5699         LIST_FOREACH_SAFE(rlp, &lfp->lf_rollback, rlck_list, nrlp)
5700                 free(rlp, M_NFSDROLLBACK);
5701         LIST_INIT(&lfp->lf_rollback);
5702 }
5703
5704 /*
5705  * Lock the struct nfslockfile for local lock updating.
5706  */
5707 static void
5708 nfsrv_locklf(struct nfslockfile *lfp)
5709 {
5710         int gotlock;
5711
5712         /* lf_usecount ensures *lfp won't be free'd */
5713         lfp->lf_usecount++;
5714         do {
5715                 gotlock = nfsv4_lock(&lfp->lf_locallock_lck, 1, NULL,
5716                     NFSSTATEMUTEXPTR, NULL);
5717         } while (gotlock == 0);
5718         lfp->lf_usecount--;
5719 }
5720
5721 /*
5722  * Unlock the struct nfslockfile after local lock updating.
5723  */
5724 static void
5725 nfsrv_unlocklf(struct nfslockfile *lfp)
5726 {
5727
5728         nfsv4_unlock(&lfp->lf_locallock_lck, 0);
5729 }
5730
5731 /*
5732  * Clear out all state for the NFSv4 server.
5733  * Must be called by a thread that can sleep when no nfsds are running.
5734  */
5735 void
5736 nfsrv_throwawayallstate(NFSPROC_T *p)
5737 {
5738         struct nfsclient *clp, *nclp;
5739         struct nfslockfile *lfp, *nlfp;
5740         int i;
5741
5742         /*
5743          * For each client, clean out the state and then free the structure.
5744          */
5745         for (i = 0; i < nfsrv_clienthashsize; i++) {
5746                 LIST_FOREACH_SAFE(clp, &nfsclienthash[i], lc_hash, nclp) {
5747                         nfsrv_cleanclient(clp, p);
5748                         nfsrv_freedeleglist(&clp->lc_deleg);
5749                         nfsrv_freedeleglist(&clp->lc_olddeleg);
5750                         free(clp->lc_stateid, M_NFSDCLIENT);
5751                         free(clp, M_NFSDCLIENT);
5752                 }
5753         }
5754
5755         /*
5756          * Also, free up any remaining lock file structures.
5757          */
5758         for (i = 0; i < nfsrv_lockhashsize; i++) {
5759                 LIST_FOREACH_SAFE(lfp, &nfslockhash[i], lf_hash, nlfp) {
5760                         printf("nfsd unload: fnd a lock file struct\n");
5761                         nfsrv_freenfslockfile(lfp);
5762                 }
5763         }
5764 }
5765
5766 /*
5767  * Check the sequence# for the session and slot provided as an argument.
5768  * Also, renew the lease if the session will return NFS_OK.
5769  */
5770 int
5771 nfsrv_checksequence(struct nfsrv_descript *nd, uint32_t sequenceid,
5772     uint32_t *highest_slotidp, uint32_t *target_highest_slotidp, int cache_this,
5773     uint32_t *sflagsp, NFSPROC_T *p)
5774 {
5775         struct nfsdsession *sep;
5776         struct nfssessionhash *shp;
5777         int error;
5778         SVCXPRT *savxprt;
5779
5780         shp = NFSSESSIONHASH(nd->nd_sessionid);
5781         NFSLOCKSESSION(shp);
5782         sep = nfsrv_findsession(nd->nd_sessionid);
5783         if (sep == NULL) {
5784                 NFSUNLOCKSESSION(shp);
5785                 return (NFSERR_BADSESSION);
5786         }
5787         error = nfsv4_seqsession(sequenceid, nd->nd_slotid, *highest_slotidp,
5788             sep->sess_slots, NULL, NFSV4_SLOTS - 1);
5789         if (error != 0) {
5790                 NFSUNLOCKSESSION(shp);
5791                 return (error);
5792         }
5793         if (cache_this != 0)
5794                 nd->nd_flag |= ND_SAVEREPLY;
5795         /* Renew the lease. */
5796         sep->sess_clp->lc_expiry = nfsrv_leaseexpiry();
5797         nd->nd_clientid.qval = sep->sess_clp->lc_clientid.qval;
5798         nd->nd_flag |= ND_IMPLIEDCLID;
5799
5800         /*
5801          * If this session handles the backchannel, save the nd_xprt for this
5802          * RPC, since this is the one being used.
5803          */
5804         if (sep->sess_clp->lc_req.nr_client != NULL &&
5805             (sep->sess_crflags & NFSV4CRSESS_CONNBACKCHAN) != 0) {
5806                 savxprt = sep->sess_cbsess.nfsess_xprt;
5807                 SVC_ACQUIRE(nd->nd_xprt);
5808                 nd->nd_xprt->xp_p2 =
5809                     sep->sess_clp->lc_req.nr_client->cl_private;
5810                 nd->nd_xprt->xp_idletimeout = 0;        /* Disable timeout. */
5811                 sep->sess_cbsess.nfsess_xprt = nd->nd_xprt;
5812                 if (savxprt != NULL)
5813                         SVC_RELEASE(savxprt);
5814         }
5815
5816         *sflagsp = 0;
5817         if (sep->sess_clp->lc_req.nr_client == NULL)
5818                 *sflagsp |= NFSV4SEQ_CBPATHDOWN;
5819         NFSUNLOCKSESSION(shp);
5820         if (error == NFSERR_EXPIRED) {
5821                 *sflagsp |= NFSV4SEQ_EXPIREDALLSTATEREVOKED;
5822                 error = 0;
5823         } else if (error == NFSERR_ADMINREVOKED) {
5824                 *sflagsp |= NFSV4SEQ_ADMINSTATEREVOKED;
5825                 error = 0;
5826         }
5827         *highest_slotidp = *target_highest_slotidp = NFSV4_SLOTS - 1;
5828         return (0);
5829 }
5830
5831 /*
5832  * Check/set reclaim complete for this session/clientid.
5833  */
5834 int
5835 nfsrv_checkreclaimcomplete(struct nfsrv_descript *nd)
5836 {
5837         struct nfsdsession *sep;
5838         struct nfssessionhash *shp;
5839         int error = 0;
5840
5841         shp = NFSSESSIONHASH(nd->nd_sessionid);
5842         NFSLOCKSTATE();
5843         NFSLOCKSESSION(shp);
5844         sep = nfsrv_findsession(nd->nd_sessionid);
5845         if (sep == NULL) {
5846                 NFSUNLOCKSESSION(shp);
5847                 NFSUNLOCKSTATE();
5848                 return (NFSERR_BADSESSION);
5849         }
5850
5851         /* Check to see if reclaim complete has already happened. */
5852         if ((sep->sess_clp->lc_flags & LCL_RECLAIMCOMPLETE) != 0)
5853                 error = NFSERR_COMPLETEALREADY;
5854         else
5855                 sep->sess_clp->lc_flags |= LCL_RECLAIMCOMPLETE;
5856         NFSUNLOCKSESSION(shp);
5857         NFSUNLOCKSTATE();
5858         return (error);
5859 }
5860
5861 /*
5862  * Cache the reply in a session slot.
5863  */
5864 void
5865 nfsrv_cache_session(uint8_t *sessionid, uint32_t slotid, int repstat,
5866    struct mbuf **m)
5867 {
5868         struct nfsdsession *sep;
5869         struct nfssessionhash *shp;
5870
5871         shp = NFSSESSIONHASH(sessionid);
5872         NFSLOCKSESSION(shp);
5873         sep = nfsrv_findsession(sessionid);
5874         if (sep == NULL) {
5875                 NFSUNLOCKSESSION(shp);
5876                 printf("nfsrv_cache_session: no session\n");
5877                 m_freem(*m);
5878                 return;
5879         }
5880         nfsv4_seqsess_cacherep(slotid, sep->sess_slots, repstat, m);
5881         NFSUNLOCKSESSION(shp);
5882 }
5883
5884 /*
5885  * Search for a session that matches the sessionid.
5886  */
5887 static struct nfsdsession *
5888 nfsrv_findsession(uint8_t *sessionid)
5889 {
5890         struct nfsdsession *sep;
5891         struct nfssessionhash *shp;
5892
5893         shp = NFSSESSIONHASH(sessionid);
5894         LIST_FOREACH(sep, &shp->list, sess_hash) {
5895                 if (!NFSBCMP(sessionid, sep->sess_sessionid, NFSX_V4SESSIONID))
5896                         break;
5897         }
5898         return (sep);
5899 }
5900
5901 /*
5902  * Destroy a session.
5903  */
5904 int
5905 nfsrv_destroysession(struct nfsrv_descript *nd, uint8_t *sessionid)
5906 {
5907         int error, samesess;
5908
5909         samesess = 0;
5910         if (!NFSBCMP(sessionid, nd->nd_sessionid, NFSX_V4SESSIONID)) {
5911                 samesess = 1;
5912                 if ((nd->nd_flag & ND_LASTOP) == 0)
5913                         return (NFSERR_BADSESSION);
5914         }
5915         error = nfsrv_freesession(NULL, sessionid);
5916         if (error == 0 && samesess != 0)
5917                 nd->nd_flag &= ~ND_HASSEQUENCE;
5918         return (error);
5919 }
5920
5921 /*
5922  * Free up a session structure.
5923  */
5924 static int
5925 nfsrv_freesession(struct nfsdsession *sep, uint8_t *sessionid)
5926 {
5927         struct nfssessionhash *shp;
5928         int i;
5929
5930         NFSLOCKSTATE();
5931         if (sep == NULL) {
5932                 shp = NFSSESSIONHASH(sessionid);
5933                 NFSLOCKSESSION(shp);
5934                 sep = nfsrv_findsession(sessionid);
5935         } else {
5936                 shp = NFSSESSIONHASH(sep->sess_sessionid);
5937                 NFSLOCKSESSION(shp);
5938         }
5939         if (sep != NULL) {
5940                 sep->sess_refcnt--;
5941                 if (sep->sess_refcnt > 0) {
5942                         NFSUNLOCKSESSION(shp);
5943                         NFSUNLOCKSTATE();
5944                         return (0);
5945                 }
5946                 LIST_REMOVE(sep, sess_hash);
5947                 LIST_REMOVE(sep, sess_list);
5948         }
5949         NFSUNLOCKSESSION(shp);
5950         NFSUNLOCKSTATE();
5951         if (sep == NULL)
5952                 return (NFSERR_BADSESSION);
5953         for (i = 0; i < NFSV4_SLOTS; i++)
5954                 if (sep->sess_slots[i].nfssl_reply != NULL)
5955                         m_freem(sep->sess_slots[i].nfssl_reply);
5956         if (sep->sess_cbsess.nfsess_xprt != NULL)
5957                 SVC_RELEASE(sep->sess_cbsess.nfsess_xprt);
5958         free(sep, M_NFSDSESSION);
5959         return (0);
5960 }
5961
5962 /*
5963  * Free a stateid.
5964  * RFC5661 says that it should fail when there are associated opens, locks
5965  * or delegations. Since stateids represent opens, I don't see how you can
5966  * free an open stateid (it will be free'd when closed), so this function
5967  * only works for lock stateids (freeing the lock_owner) or delegations.
5968  */
5969 int
5970 nfsrv_freestateid(struct nfsrv_descript *nd, nfsv4stateid_t *stateidp,
5971     NFSPROC_T *p)
5972 {
5973         struct nfsclient *clp;
5974         struct nfsstate *stp;
5975         int error;
5976
5977         NFSLOCKSTATE();
5978         /*
5979          * Look up the stateid
5980          */
5981         error = nfsrv_getclient((nfsquad_t)((u_quad_t)0), CLOPS_RENEW, &clp,
5982             NULL, (nfsquad_t)((u_quad_t)0), 0, nd, p);
5983         if (error == 0) {
5984                 /* First, check for a delegation. */
5985                 LIST_FOREACH(stp, &clp->lc_deleg, ls_list) {
5986                         if (!NFSBCMP(stp->ls_stateid.other, stateidp->other,
5987                             NFSX_STATEIDOTHER))
5988                                 break;
5989                 }
5990                 if (stp != NULL) {
5991                         nfsrv_freedeleg(stp);
5992                         NFSUNLOCKSTATE();
5993                         return (error);
5994                 }
5995         }
5996         /* Not a delegation, try for a lock_owner. */
5997         if (error == 0)
5998                 error = nfsrv_getstate(clp, stateidp, 0, &stp);
5999         if (error == 0 && ((stp->ls_flags & (NFSLCK_OPEN | NFSLCK_DELEGREAD |
6000             NFSLCK_DELEGWRITE)) != 0 || (stp->ls_flags & NFSLCK_LOCK) == 0))
6001                 /* Not a lock_owner stateid. */
6002                 error = NFSERR_LOCKSHELD;
6003         if (error == 0 && !LIST_EMPTY(&stp->ls_lock))
6004                 error = NFSERR_LOCKSHELD;
6005         if (error == 0)
6006                 nfsrv_freelockowner(stp, NULL, 0, p);
6007         NFSUNLOCKSTATE();
6008         return (error);
6009 }
6010
6011 /*
6012  * Generate the xdr for an NFSv4.1 CBSequence Operation.
6013  */
6014 static int
6015 nfsv4_setcbsequence(struct nfsrv_descript *nd, struct nfsclient *clp,
6016     int dont_replycache, struct nfsdsession **sepp)
6017 {
6018         struct nfsdsession *sep;
6019         uint32_t *tl, slotseq = 0;
6020         int maxslot, slotpos;
6021         uint8_t sessionid[NFSX_V4SESSIONID];
6022         int error;
6023
6024         error = nfsv4_getcbsession(clp, sepp);
6025         if (error != 0)
6026                 return (error);
6027         sep = *sepp;
6028         (void)nfsv4_sequencelookup(NULL, &sep->sess_cbsess, &slotpos, &maxslot,
6029             &slotseq, sessionid);
6030         KASSERT(maxslot >= 0, ("nfsv4_setcbsequence neg maxslot"));
6031
6032         /* Build the Sequence arguments. */
6033         NFSM_BUILD(tl, uint32_t *, NFSX_V4SESSIONID + 5 * NFSX_UNSIGNED);
6034         bcopy(sessionid, tl, NFSX_V4SESSIONID);
6035         tl += NFSX_V4SESSIONID / NFSX_UNSIGNED;
6036         nd->nd_slotseq = tl;
6037         *tl++ = txdr_unsigned(slotseq);
6038         *tl++ = txdr_unsigned(slotpos);
6039         *tl++ = txdr_unsigned(maxslot);
6040         if (dont_replycache == 0)
6041                 *tl++ = newnfs_true;
6042         else
6043                 *tl++ = newnfs_false;
6044         *tl = 0;                        /* No referring call list, for now. */
6045         nd->nd_flag |= ND_HASSEQUENCE;
6046         return (0);
6047 }
6048
6049 /*
6050  * Get a session for the callback.
6051  */
6052 static int
6053 nfsv4_getcbsession(struct nfsclient *clp, struct nfsdsession **sepp)
6054 {
6055         struct nfsdsession *sep;
6056
6057         NFSLOCKSTATE();
6058         LIST_FOREACH(sep, &clp->lc_session, sess_list) {
6059                 if ((sep->sess_crflags & NFSV4CRSESS_CONNBACKCHAN) != 0)
6060                         break;
6061         }
6062         if (sep == NULL) {
6063                 NFSUNLOCKSTATE();
6064                 return (NFSERR_BADSESSION);
6065         }
6066         sep->sess_refcnt++;
6067         *sepp = sep;
6068         NFSUNLOCKSTATE();
6069         return (0);
6070 }
6071
6072 /*
6073  * Free up all backchannel xprts.  This needs to be done when the nfsd threads
6074  * exit, since those transports will all be going away.
6075  * This is only called after all the nfsd threads are done performing RPCs,
6076  * so locking shouldn't be an issue.
6077  */
6078 APPLESTATIC void
6079 nfsrv_freeallbackchannel_xprts(void)
6080 {
6081         struct nfsdsession *sep;
6082         struct nfsclient *clp;
6083         SVCXPRT *xprt;
6084         int i;
6085
6086         for (i = 0; i < nfsrv_clienthashsize; i++) {
6087                 LIST_FOREACH(clp, &nfsclienthash[i], lc_hash) {
6088                         LIST_FOREACH(sep, &clp->lc_session, sess_list) {
6089                                 xprt = sep->sess_cbsess.nfsess_xprt;
6090                                 sep->sess_cbsess.nfsess_xprt = NULL;
6091                                 if (xprt != NULL)
6092                                         SVC_RELEASE(xprt);
6093                         }
6094                 }
6095         }
6096 }
6097