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MFC: r307694
[FreeBSD/stable/10.git] / 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 nfsstats newnfsstats;
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 TUNABLE_INT("vfs.nfsd.statehashsize", &nfsrv_statehashsize);
50 SYSCTL_INT(_vfs_nfsd, OID_AUTO, statehashsize, CTLFLAG_RDTUN,
51     &nfsrv_statehashsize, 0,
52     "Size of state hash table set via loader.conf");
53
54 int     nfsrv_clienthashsize = NFSCLIENTHASHSIZE;
55 TUNABLE_INT("vfs.nfsd.clienthashsize", &nfsrv_clienthashsize);
56 SYSCTL_INT(_vfs_nfsd, OID_AUTO, clienthashsize, CTLFLAG_RDTUN,
57     &nfsrv_clienthashsize, 0,
58     "Size of client hash table set via loader.conf");
59
60 int     nfsrv_lockhashsize = NFSLOCKHASHSIZE;
61 TUNABLE_INT("vfs.nfsd.fhhashsize", &nfsrv_lockhashsize);
62 SYSCTL_INT(_vfs_nfsd, OID_AUTO, fhhashsize, CTLFLAG_RDTUN,
63     &nfsrv_lockhashsize, 0,
64     "Size of file handle hash table set via loader.conf");
65
66 int     nfsrv_sessionhashsize = NFSSESSIONHASHSIZE;
67 TUNABLE_INT("vfs.nfsd.sessionhashsize", &nfsrv_sessionhashsize);
68 SYSCTL_INT(_vfs_nfsd, OID_AUTO, sessionhashsize, CTLFLAG_RDTUN,
69     &nfsrv_sessionhashsize, 0,
70     "Size of session hash table set via loader.conf");
71
72 static int      nfsrv_v4statelimit = NFSRV_V4STATELIMIT;
73 TUNABLE_INT("vfs.nfsd.v4statelimit", &nfsrv_v4statelimit);
74 SYSCTL_INT(_vfs_nfsd, OID_AUTO, v4statelimit, CTLFLAG_RWTUN,
75     &nfsrv_v4statelimit, 0,
76     "High water limit for NFSv4 opens+locks+delegations");
77
78 static int      nfsrv_writedelegifpos = 0;
79 SYSCTL_INT(_vfs_nfsd, OID_AUTO, writedelegifpos, CTLFLAG_RW,
80     &nfsrv_writedelegifpos, 0,
81     "Issue a write delegation for read opens if possible");
82
83 /*
84  * Hash lists for nfs V4.
85  */
86 struct nfsclienthashhead        *nfsclienthash;
87 struct nfslockhashhead          *nfslockhash;
88 struct nfssessionhash           *nfssessionhash;
89 #endif  /* !APPLEKEXT */
90
91 static u_int32_t nfsrv_openpluslock = 0, nfsrv_delegatecnt = 0;
92 static time_t nfsrvboottime;
93 static int nfsrv_returnoldstateid = 0, nfsrv_clients = 0;
94 static int nfsrv_clienthighwater = NFSRV_CLIENTHIGHWATER;
95 static int nfsrv_nogsscallback = 0;
96
97 /* local functions */
98 static void nfsrv_dumpaclient(struct nfsclient *clp,
99     struct nfsd_dumpclients *dumpp);
100 static void nfsrv_freeopenowner(struct nfsstate *stp, int cansleep,
101     NFSPROC_T *p);
102 static int nfsrv_freeopen(struct nfsstate *stp, vnode_t vp, int cansleep,
103     NFSPROC_T *p);
104 static void nfsrv_freelockowner(struct nfsstate *stp, vnode_t vp, int cansleep,
105     NFSPROC_T *p);
106 static void nfsrv_freeallnfslocks(struct nfsstate *stp, vnode_t vp,
107     int cansleep, NFSPROC_T *p);
108 static void nfsrv_freenfslock(struct nfslock *lop);
109 static void nfsrv_freenfslockfile(struct nfslockfile *lfp);
110 static void nfsrv_freedeleg(struct nfsstate *);
111 static int nfsrv_getstate(struct nfsclient *clp, nfsv4stateid_t *stateidp, 
112     u_int32_t flags, struct nfsstate **stpp);
113 static void nfsrv_getowner(struct nfsstatehead *hp, struct nfsstate *new_stp,
114     struct nfsstate **stpp);
115 static int nfsrv_getlockfh(vnode_t vp, u_short flags,
116     struct nfslockfile *new_lfp, fhandle_t *nfhp, NFSPROC_T *p);
117 static int nfsrv_getlockfile(u_short flags, struct nfslockfile **new_lfpp,
118     struct nfslockfile **lfpp, fhandle_t *nfhp, int lockit);
119 static void nfsrv_insertlock(struct nfslock *new_lop,
120     struct nfslock *insert_lop, struct nfsstate *stp, struct nfslockfile *lfp);
121 static void nfsrv_updatelock(struct nfsstate *stp, struct nfslock **new_lopp,
122     struct nfslock **other_lopp, struct nfslockfile *lfp);
123 static int nfsrv_getipnumber(u_char *cp);
124 static int nfsrv_checkrestart(nfsquad_t clientid, u_int32_t flags,
125     nfsv4stateid_t *stateidp, int specialid);
126 static int nfsrv_checkgrace(struct nfsrv_descript *nd, struct nfsclient *clp,
127     u_int32_t flags);
128 static int nfsrv_docallback(struct nfsclient *clp, int procnum,
129     nfsv4stateid_t *stateidp, int trunc, fhandle_t *fhp,
130     struct nfsvattr *nap, nfsattrbit_t *attrbitp, NFSPROC_T *p);
131 static int nfsrv_cbcallargs(struct nfsrv_descript *nd, struct nfsclient *clp,
132     uint32_t callback, int op, const char *optag, struct nfsdsession **sepp);
133 static u_int32_t nfsrv_nextclientindex(void);
134 static u_int32_t nfsrv_nextstateindex(struct nfsclient *clp);
135 static void nfsrv_markstable(struct nfsclient *clp);
136 static int nfsrv_checkstable(struct nfsclient *clp);
137 static int nfsrv_clientconflict(struct nfsclient *clp, int *haslockp, struct 
138     vnode *vp, NFSPROC_T *p);
139 static int nfsrv_delegconflict(struct nfsstate *stp, int *haslockp,
140     NFSPROC_T *p, vnode_t vp);
141 static int nfsrv_cleandeleg(vnode_t vp, struct nfslockfile *lfp,
142     struct nfsclient *clp, int *haslockp, NFSPROC_T *p);
143 static int nfsrv_notsamecredname(struct nfsrv_descript *nd,
144     struct nfsclient *clp);
145 static time_t nfsrv_leaseexpiry(void);
146 static void nfsrv_delaydelegtimeout(struct nfsstate *stp);
147 static int nfsrv_checkseqid(struct nfsrv_descript *nd, u_int32_t seqid,
148     struct nfsstate *stp, struct nfsrvcache *op);
149 static int nfsrv_nootherstate(struct nfsstate *stp);
150 static int nfsrv_locallock(vnode_t vp, struct nfslockfile *lfp, int flags,
151     uint64_t first, uint64_t end, struct nfslockconflict *cfp, NFSPROC_T *p);
152 static void nfsrv_localunlock(vnode_t vp, struct nfslockfile *lfp,
153     uint64_t init_first, uint64_t init_end, NFSPROC_T *p);
154 static int nfsrv_dolocal(vnode_t vp, struct nfslockfile *lfp, int flags,
155     int oldflags, uint64_t first, uint64_t end, struct nfslockconflict *cfp,
156     NFSPROC_T *p);
157 static void nfsrv_locallock_rollback(vnode_t vp, struct nfslockfile *lfp,
158     NFSPROC_T *p);
159 static void nfsrv_locallock_commit(struct nfslockfile *lfp, int flags,
160     uint64_t first, uint64_t end);
161 static void nfsrv_locklf(struct nfslockfile *lfp);
162 static void nfsrv_unlocklf(struct nfslockfile *lfp);
163 static struct nfsdsession *nfsrv_findsession(uint8_t *sessionid);
164 static int nfsrv_freesession(struct nfsdsession *sep, uint8_t *sessionid);
165 static int nfsv4_setcbsequence(struct nfsrv_descript *nd, struct nfsclient *clp,
166     int dont_replycache, struct nfsdsession **sepp);
167 static int nfsv4_getcbsession(struct nfsclient *clp, struct nfsdsession **sepp);
168
169 /*
170  * Scan the client list for a match and either return the current one,
171  * create a new entry or return an error.
172  * If returning a non-error, the clp structure must either be linked into
173  * the client list or free'd.
174  */
175 APPLESTATIC int
176 nfsrv_setclient(struct nfsrv_descript *nd, struct nfsclient **new_clpp,
177     nfsquad_t *clientidp, nfsquad_t *confirmp, NFSPROC_T *p)
178 {
179         struct nfsclient *clp = NULL, *new_clp = *new_clpp;
180         int i, error = 0;
181         struct nfsstate *stp, *tstp;
182         struct sockaddr_in *sad, *rad;
183         int zapit = 0, gotit, hasstate = 0, igotlock;
184         static u_int64_t confirm_index = 0;
185
186         /*
187          * Check for state resource limit exceeded.
188          */
189         if (nfsrv_openpluslock > nfsrv_v4statelimit) {
190                 error = NFSERR_RESOURCE;
191                 goto out;
192         }
193
194         if (nfsrv_issuedelegs == 0 ||
195             ((nd->nd_flag & ND_GSS) != 0 && nfsrv_nogsscallback != 0))
196                 /*
197                  * Don't do callbacks when delegations are disabled or
198                  * for AUTH_GSS unless enabled via nfsrv_nogsscallback.
199                  * If establishing a callback connection is attempted
200                  * when a firewall is blocking the callback path, the
201                  * server may wait too long for the connect attempt to
202                  * succeed during the Open. Some clients, such as Linux,
203                  * may timeout and give up on the Open before the server
204                  * replies. Also, since AUTH_GSS callbacks are not
205                  * yet interoperability tested, they might cause the
206                  * server to crap out, if they get past the Init call to
207                  * the client.
208                  */
209                 new_clp->lc_program = 0;
210
211         /* Lock out other nfsd threads */
212         NFSLOCKV4ROOTMUTEX();
213         nfsv4_relref(&nfsv4rootfs_lock);
214         do {
215                 igotlock = nfsv4_lock(&nfsv4rootfs_lock, 1, NULL,
216                     NFSV4ROOTLOCKMUTEXPTR, NULL);
217         } while (!igotlock);
218         NFSUNLOCKV4ROOTMUTEX();
219
220         /*
221          * Search for a match in the client list.
222          */
223         gotit = i = 0;
224         while (i < nfsrv_clienthashsize && !gotit) {
225             LIST_FOREACH(clp, &nfsclienthash[i], lc_hash) {
226                 if (new_clp->lc_idlen == clp->lc_idlen &&
227                     !NFSBCMP(new_clp->lc_id, clp->lc_id, clp->lc_idlen)) {
228                         gotit = 1;
229                         break;
230                 }
231             }
232             if (gotit == 0)
233                 i++;
234         }
235         if (!gotit ||
236             (clp->lc_flags & (LCL_NEEDSCONFIRM | LCL_ADMINREVOKED))) {
237                 if ((nd->nd_flag & ND_NFSV41) != 0 && confirmp->lval[1] != 0) {
238                         /*
239                          * For NFSv4.1, if confirmp->lval[1] is non-zero, the
240                          * client is trying to update a confirmed clientid.
241                          */
242                         NFSLOCKV4ROOTMUTEX();
243                         nfsv4_unlock(&nfsv4rootfs_lock, 1);
244                         NFSUNLOCKV4ROOTMUTEX();
245                         confirmp->lval[1] = 0;
246                         error = NFSERR_NOENT;
247                         goto out;
248                 }
249                 /*
250                  * Get rid of the old one.
251                  */
252                 if (i != nfsrv_clienthashsize) {
253                         LIST_REMOVE(clp, lc_hash);
254                         nfsrv_cleanclient(clp, p);
255                         nfsrv_freedeleglist(&clp->lc_deleg);
256                         nfsrv_freedeleglist(&clp->lc_olddeleg);
257                         zapit = 1;
258                 }
259                 /*
260                  * Add it after assigning a client id to it.
261                  */
262                 new_clp->lc_flags |= LCL_NEEDSCONFIRM;
263                 if ((nd->nd_flag & ND_NFSV41) != 0)
264                         new_clp->lc_confirm.lval[0] = confirmp->lval[0] =
265                             ++confirm_index;
266                 else
267                         confirmp->qval = new_clp->lc_confirm.qval =
268                             ++confirm_index;
269                 clientidp->lval[0] = new_clp->lc_clientid.lval[0] =
270                     (u_int32_t)nfsrvboottime;
271                 clientidp->lval[1] = new_clp->lc_clientid.lval[1] =
272                     nfsrv_nextclientindex();
273                 new_clp->lc_stateindex = 0;
274                 new_clp->lc_statemaxindex = 0;
275                 new_clp->lc_cbref = 0;
276                 new_clp->lc_expiry = nfsrv_leaseexpiry();
277                 LIST_INIT(&new_clp->lc_open);
278                 LIST_INIT(&new_clp->lc_deleg);
279                 LIST_INIT(&new_clp->lc_olddeleg);
280                 LIST_INIT(&new_clp->lc_session);
281                 for (i = 0; i < nfsrv_statehashsize; i++)
282                         LIST_INIT(&new_clp->lc_stateid[i]);
283                 LIST_INSERT_HEAD(NFSCLIENTHASH(new_clp->lc_clientid), new_clp,
284                     lc_hash);
285                 newnfsstats.srvclients++;
286                 nfsrv_openpluslock++;
287                 nfsrv_clients++;
288                 NFSLOCKV4ROOTMUTEX();
289                 nfsv4_unlock(&nfsv4rootfs_lock, 1);
290                 NFSUNLOCKV4ROOTMUTEX();
291                 if (zapit)
292                         nfsrv_zapclient(clp, p);
293                 *new_clpp = NULL;
294                 goto out;
295         }
296
297         /*
298          * Now, handle the cases where the id is already issued.
299          */
300         if (nfsrv_notsamecredname(nd, clp)) {
301             /*
302              * Check to see if there is expired state that should go away.
303              */
304             if (clp->lc_expiry < NFSD_MONOSEC &&
305                 (!LIST_EMPTY(&clp->lc_open) || !LIST_EMPTY(&clp->lc_deleg))) {
306                 nfsrv_cleanclient(clp, p);
307                 nfsrv_freedeleglist(&clp->lc_deleg);
308             }
309
310             /*
311              * If there is outstanding state, then reply NFSERR_CLIDINUSE per
312              * RFC3530 Sec. 8.1.2 last para.
313              */
314             if (!LIST_EMPTY(&clp->lc_deleg)) {
315                 hasstate = 1;
316             } else if (LIST_EMPTY(&clp->lc_open)) {
317                 hasstate = 0;
318             } else {
319                 hasstate = 0;
320                 /* Look for an Open on the OpenOwner */
321                 LIST_FOREACH(stp, &clp->lc_open, ls_list) {
322                     if (!LIST_EMPTY(&stp->ls_open)) {
323                         hasstate = 1;
324                         break;
325                     }
326                 }
327             }
328             if (hasstate) {
329                 /*
330                  * If the uid doesn't match, return NFSERR_CLIDINUSE after
331                  * filling out the correct ipaddr and portnum.
332                  */
333                 sad = NFSSOCKADDR(new_clp->lc_req.nr_nam, struct sockaddr_in *);
334                 rad = NFSSOCKADDR(clp->lc_req.nr_nam, struct sockaddr_in *);
335                 sad->sin_addr.s_addr = rad->sin_addr.s_addr;
336                 sad->sin_port = rad->sin_port;
337                 NFSLOCKV4ROOTMUTEX();
338                 nfsv4_unlock(&nfsv4rootfs_lock, 1);
339                 NFSUNLOCKV4ROOTMUTEX();
340                 error = NFSERR_CLIDINUSE;
341                 goto out;
342             }
343         }
344
345         if (NFSBCMP(new_clp->lc_verf, clp->lc_verf, NFSX_VERF)) {
346                 /*
347                  * If the verifier has changed, the client has rebooted
348                  * and a new client id is issued. The old state info
349                  * can be thrown away once the SETCLIENTID_CONFIRM occurs.
350                  */
351                 LIST_REMOVE(clp, lc_hash);
352                 new_clp->lc_flags |= LCL_NEEDSCONFIRM;
353                 if ((nd->nd_flag & ND_NFSV41) != 0)
354                         new_clp->lc_confirm.lval[0] = confirmp->lval[0] =
355                             ++confirm_index;
356                 else
357                         confirmp->qval = new_clp->lc_confirm.qval =
358                             ++confirm_index;
359                 clientidp->lval[0] = new_clp->lc_clientid.lval[0] =
360                     nfsrvboottime;
361                 clientidp->lval[1] = new_clp->lc_clientid.lval[1] =
362                     nfsrv_nextclientindex();
363                 new_clp->lc_stateindex = 0;
364                 new_clp->lc_statemaxindex = 0;
365                 new_clp->lc_cbref = 0;
366                 new_clp->lc_expiry = nfsrv_leaseexpiry();
367
368                 /*
369                  * Save the state until confirmed.
370                  */
371                 LIST_NEWHEAD(&new_clp->lc_open, &clp->lc_open, ls_list);
372                 LIST_FOREACH(tstp, &new_clp->lc_open, ls_list)
373                         tstp->ls_clp = new_clp;
374                 LIST_NEWHEAD(&new_clp->lc_deleg, &clp->lc_deleg, ls_list);
375                 LIST_FOREACH(tstp, &new_clp->lc_deleg, ls_list)
376                         tstp->ls_clp = new_clp;
377                 LIST_NEWHEAD(&new_clp->lc_olddeleg, &clp->lc_olddeleg,
378                     ls_list);
379                 LIST_FOREACH(tstp, &new_clp->lc_olddeleg, ls_list)
380                         tstp->ls_clp = new_clp;
381                 for (i = 0; i < nfsrv_statehashsize; i++) {
382                         LIST_NEWHEAD(&new_clp->lc_stateid[i],
383                             &clp->lc_stateid[i], ls_hash);
384                         LIST_FOREACH(tstp, &new_clp->lc_stateid[i], ls_hash)
385                                 tstp->ls_clp = new_clp;
386                 }
387                 LIST_INSERT_HEAD(NFSCLIENTHASH(new_clp->lc_clientid), new_clp,
388                     lc_hash);
389                 newnfsstats.srvclients++;
390                 nfsrv_openpluslock++;
391                 nfsrv_clients++;
392                 NFSLOCKV4ROOTMUTEX();
393                 nfsv4_unlock(&nfsv4rootfs_lock, 1);
394                 NFSUNLOCKV4ROOTMUTEX();
395
396                 /*
397                  * Must wait until any outstanding callback on the old clp
398                  * completes.
399                  */
400                 NFSLOCKSTATE();
401                 while (clp->lc_cbref) {
402                         clp->lc_flags |= LCL_WAKEUPWANTED;
403                         (void)mtx_sleep(clp, NFSSTATEMUTEXPTR, PZERO - 1,
404                             "nfsd clp", 10 * hz);
405                 }
406                 NFSUNLOCKSTATE();
407                 nfsrv_zapclient(clp, p);
408                 *new_clpp = NULL;
409                 goto out;
410         }
411
412         /* For NFSv4.1, mark that we found a confirmed clientid. */
413         if ((nd->nd_flag & ND_NFSV41) != 0) {
414                 clientidp->lval[0] = clp->lc_clientid.lval[0];
415                 clientidp->lval[1] = clp->lc_clientid.lval[1];
416                 confirmp->lval[0] = 0;  /* Ignored by client */
417                 confirmp->lval[1] = 1;
418         } else {
419                 /*
420                  * id and verifier match, so update the net address info
421                  * and get rid of any existing callback authentication
422                  * handle, so a new one will be acquired.
423                  */
424                 LIST_REMOVE(clp, lc_hash);
425                 new_clp->lc_flags |= (LCL_NEEDSCONFIRM | LCL_DONTCLEAN);
426                 new_clp->lc_expiry = nfsrv_leaseexpiry();
427                 confirmp->qval = new_clp->lc_confirm.qval = ++confirm_index;
428                 clientidp->lval[0] = new_clp->lc_clientid.lval[0] =
429                     clp->lc_clientid.lval[0];
430                 clientidp->lval[1] = new_clp->lc_clientid.lval[1] =
431                     clp->lc_clientid.lval[1];
432                 new_clp->lc_delegtime = clp->lc_delegtime;
433                 new_clp->lc_stateindex = clp->lc_stateindex;
434                 new_clp->lc_statemaxindex = clp->lc_statemaxindex;
435                 new_clp->lc_cbref = 0;
436                 LIST_NEWHEAD(&new_clp->lc_open, &clp->lc_open, ls_list);
437                 LIST_FOREACH(tstp, &new_clp->lc_open, ls_list)
438                         tstp->ls_clp = new_clp;
439                 LIST_NEWHEAD(&new_clp->lc_deleg, &clp->lc_deleg, ls_list);
440                 LIST_FOREACH(tstp, &new_clp->lc_deleg, ls_list)
441                         tstp->ls_clp = new_clp;
442                 LIST_NEWHEAD(&new_clp->lc_olddeleg, &clp->lc_olddeleg, ls_list);
443                 LIST_FOREACH(tstp, &new_clp->lc_olddeleg, ls_list)
444                         tstp->ls_clp = new_clp;
445                 for (i = 0; i < nfsrv_statehashsize; i++) {
446                         LIST_NEWHEAD(&new_clp->lc_stateid[i],
447                             &clp->lc_stateid[i], ls_hash);
448                         LIST_FOREACH(tstp, &new_clp->lc_stateid[i], ls_hash)
449                                 tstp->ls_clp = new_clp;
450                 }
451                 LIST_INSERT_HEAD(NFSCLIENTHASH(new_clp->lc_clientid), new_clp,
452                     lc_hash);
453                 newnfsstats.srvclients++;
454                 nfsrv_openpluslock++;
455                 nfsrv_clients++;
456         }
457         NFSLOCKV4ROOTMUTEX();
458         nfsv4_unlock(&nfsv4rootfs_lock, 1);
459         NFSUNLOCKV4ROOTMUTEX();
460
461         if ((nd->nd_flag & ND_NFSV41) == 0) {
462                 /*
463                  * Must wait until any outstanding callback on the old clp
464                  * completes.
465                  */
466                 NFSLOCKSTATE();
467                 while (clp->lc_cbref) {
468                         clp->lc_flags |= LCL_WAKEUPWANTED;
469                         (void)mtx_sleep(clp, NFSSTATEMUTEXPTR, PZERO - 1,
470                             "nfsdclp", 10 * hz);
471                 }
472                 NFSUNLOCKSTATE();
473                 nfsrv_zapclient(clp, p);
474                 *new_clpp = NULL;
475         }
476
477 out:
478         NFSEXITCODE2(error, nd);
479         return (error);
480 }
481
482 /*
483  * Check to see if the client id exists and optionally confirm it.
484  */
485 APPLESTATIC int
486 nfsrv_getclient(nfsquad_t clientid, int opflags, struct nfsclient **clpp,
487     struct nfsdsession *nsep, nfsquad_t confirm, uint32_t cbprogram,
488     struct nfsrv_descript *nd, NFSPROC_T *p)
489 {
490         struct nfsclient *clp;
491         struct nfsstate *stp;
492         int i;
493         struct nfsclienthashhead *hp;
494         int error = 0, igotlock, doneok;
495         struct nfssessionhash *shp;
496         struct nfsdsession *sep;
497         uint64_t sessid[2];
498         static uint64_t next_sess = 0;
499
500         if (clpp)
501                 *clpp = NULL;
502         if ((nd == NULL || (nd->nd_flag & ND_NFSV41) == 0 ||
503             opflags != CLOPS_RENEW) && nfsrvboottime != clientid.lval[0]) {
504                 error = NFSERR_STALECLIENTID;
505                 goto out;
506         }
507
508         /*
509          * If called with opflags == CLOPS_RENEW, the State Lock is
510          * already held. Otherwise, we need to get either that or,
511          * for the case of Confirm, lock out the nfsd threads.
512          */
513         if (opflags & CLOPS_CONFIRM) {
514                 NFSLOCKV4ROOTMUTEX();
515                 nfsv4_relref(&nfsv4rootfs_lock);
516                 do {
517                         igotlock = nfsv4_lock(&nfsv4rootfs_lock, 1, NULL,
518                             NFSV4ROOTLOCKMUTEXPTR, NULL);
519                 } while (!igotlock);
520                 /*
521                  * Create a new sessionid here, since we need to do it where
522                  * there is a mutex held to serialize update of next_sess.
523                  */
524                 if ((nd->nd_flag & ND_NFSV41) != 0) {
525                         sessid[0] = ++next_sess;
526                         sessid[1] = clientid.qval;
527                 }
528                 NFSUNLOCKV4ROOTMUTEX();
529         } else if (opflags != CLOPS_RENEW) {
530                 NFSLOCKSTATE();
531         }
532
533         /* For NFSv4.1, the clp is acquired from the associated session. */
534         if (nd != NULL && (nd->nd_flag & ND_NFSV41) != 0 &&
535             opflags == CLOPS_RENEW) {
536                 clp = NULL;
537                 if ((nd->nd_flag & ND_HASSEQUENCE) != 0) {
538                         shp = NFSSESSIONHASH(nd->nd_sessionid);
539                         NFSLOCKSESSION(shp);
540                         sep = nfsrv_findsession(nd->nd_sessionid);
541                         if (sep != NULL)
542                                 clp = sep->sess_clp;
543                         NFSUNLOCKSESSION(shp);
544                 }
545         } else {
546                 hp = NFSCLIENTHASH(clientid);
547                 LIST_FOREACH(clp, hp, lc_hash) {
548                         if (clp->lc_clientid.lval[1] == clientid.lval[1])
549                                 break;
550                 }
551         }
552         if (clp == NULL) {
553                 if (opflags & CLOPS_CONFIRM)
554                         error = NFSERR_STALECLIENTID;
555                 else
556                         error = NFSERR_EXPIRED;
557         } else if (clp->lc_flags & LCL_ADMINREVOKED) {
558                 /*
559                  * If marked admin revoked, just return the error.
560                  */
561                 error = NFSERR_ADMINREVOKED;
562         }
563         if (error) {
564                 if (opflags & CLOPS_CONFIRM) {
565                         NFSLOCKV4ROOTMUTEX();
566                         nfsv4_unlock(&nfsv4rootfs_lock, 1);
567                         NFSUNLOCKV4ROOTMUTEX();
568                 } else if (opflags != CLOPS_RENEW) {
569                         NFSUNLOCKSTATE();
570                 }
571                 goto out;
572         }
573
574         /*
575          * Perform any operations specified by the opflags.
576          */
577         if (opflags & CLOPS_CONFIRM) {
578                 if (((nd->nd_flag & ND_NFSV41) != 0 &&
579                      clp->lc_confirm.lval[0] != confirm.lval[0]) ||
580                     ((nd->nd_flag & ND_NFSV41) == 0 &&
581                      clp->lc_confirm.qval != confirm.qval))
582                         error = NFSERR_STALECLIENTID;
583                 else if (nfsrv_notsamecredname(nd, clp))
584                         error = NFSERR_CLIDINUSE;
585
586                 if (!error) {
587                     if ((clp->lc_flags & (LCL_NEEDSCONFIRM | LCL_DONTCLEAN)) ==
588                         LCL_NEEDSCONFIRM) {
589                         /*
590                          * Hang onto the delegations (as old delegations)
591                          * for an Open with CLAIM_DELEGATE_PREV unless in
592                          * grace, but get rid of the rest of the state.
593                          */
594                         nfsrv_cleanclient(clp, p);
595                         nfsrv_freedeleglist(&clp->lc_olddeleg);
596                         if (nfsrv_checkgrace(nd, clp, 0)) {
597                             /* In grace, so just delete delegations */
598                             nfsrv_freedeleglist(&clp->lc_deleg);
599                         } else {
600                             LIST_FOREACH(stp, &clp->lc_deleg, ls_list)
601                                 stp->ls_flags |= NFSLCK_OLDDELEG;
602                             clp->lc_delegtime = NFSD_MONOSEC +
603                                 nfsrv_lease + NFSRV_LEASEDELTA;
604                             LIST_NEWHEAD(&clp->lc_olddeleg, &clp->lc_deleg,
605                                 ls_list);
606                         }
607                         if ((nd->nd_flag & ND_NFSV41) != 0)
608                             clp->lc_program = cbprogram;
609                     }
610                     clp->lc_flags &= ~(LCL_NEEDSCONFIRM | LCL_DONTCLEAN);
611                     if (clp->lc_program)
612                         clp->lc_flags |= LCL_NEEDSCBNULL;
613                     /* For NFSv4.1, link the session onto the client. */
614                     if (nsep != NULL) {
615                         /* Hold a reference on the xprt for a backchannel. */
616                         if ((nsep->sess_crflags & NFSV4CRSESS_CONNBACKCHAN)
617                             != 0 && clp->lc_req.nr_client == NULL) {
618                             clp->lc_req.nr_client = (struct __rpc_client *)
619                                 clnt_bck_create(nd->nd_xprt->xp_socket,
620                                 cbprogram, NFSV4_CBVERS);
621                             if (clp->lc_req.nr_client != NULL) {
622                                 SVC_ACQUIRE(nd->nd_xprt);
623                                 nd->nd_xprt->xp_p2 =
624                                     clp->lc_req.nr_client->cl_private;
625                                 /* Disable idle timeout. */
626                                 nd->nd_xprt->xp_idletimeout = 0;
627                                 nsep->sess_cbsess.nfsess_xprt = nd->nd_xprt;
628                             } else
629                                 nsep->sess_crflags &= ~NFSV4CRSESS_CONNBACKCHAN;
630                         }
631                         NFSBCOPY(sessid, nsep->sess_sessionid,
632                             NFSX_V4SESSIONID);
633                         NFSBCOPY(sessid, nsep->sess_cbsess.nfsess_sessionid,
634                             NFSX_V4SESSIONID);
635                         shp = NFSSESSIONHASH(nsep->sess_sessionid);
636                         NFSLOCKSTATE();
637                         NFSLOCKSESSION(shp);
638                         LIST_INSERT_HEAD(&shp->list, nsep, sess_hash);
639                         LIST_INSERT_HEAD(&clp->lc_session, nsep, sess_list);
640                         nsep->sess_clp = clp;
641                         NFSUNLOCKSESSION(shp);
642                         NFSUNLOCKSTATE();
643                     }
644                 }
645         } else if (clp->lc_flags & LCL_NEEDSCONFIRM) {
646                 error = NFSERR_EXPIRED;
647         }
648
649         /*
650          * If called by the Renew Op, we must check the principal.
651          */
652         if (!error && (opflags & CLOPS_RENEWOP)) {
653             if (nfsrv_notsamecredname(nd, clp)) {
654                 doneok = 0;
655                 for (i = 0; i < nfsrv_statehashsize && doneok == 0; i++) {
656                     LIST_FOREACH(stp, &clp->lc_stateid[i], ls_hash) {
657                         if ((stp->ls_flags & NFSLCK_OPEN) &&
658                             stp->ls_uid == nd->nd_cred->cr_uid) {
659                                 doneok = 1;
660                                 break;
661                         }
662                     }
663                 }
664                 if (!doneok)
665                         error = NFSERR_ACCES;
666             }
667             if (!error && (clp->lc_flags & LCL_CBDOWN))
668                 error = NFSERR_CBPATHDOWN;
669         }
670         if ((!error || error == NFSERR_CBPATHDOWN) &&
671              (opflags & CLOPS_RENEW)) {
672                 clp->lc_expiry = nfsrv_leaseexpiry();
673         }
674         if (opflags & CLOPS_CONFIRM) {
675                 NFSLOCKV4ROOTMUTEX();
676                 nfsv4_unlock(&nfsv4rootfs_lock, 1);
677                 NFSUNLOCKV4ROOTMUTEX();
678         } else if (opflags != CLOPS_RENEW) {
679                 NFSUNLOCKSTATE();
680         }
681         if (clpp)
682                 *clpp = clp;
683
684 out:
685         NFSEXITCODE2(error, nd);
686         return (error);
687 }
688
689 /*
690  * Perform the NFSv4.1 destroy clientid.
691  */
692 int
693 nfsrv_destroyclient(nfsquad_t clientid, NFSPROC_T *p)
694 {
695         struct nfsclient *clp;
696         struct nfsclienthashhead *hp;
697         int error = 0, i, igotlock;
698
699         if (nfsrvboottime != clientid.lval[0]) {
700                 error = NFSERR_STALECLIENTID;
701                 goto out;
702         }
703
704         /* Lock out other nfsd threads */
705         NFSLOCKV4ROOTMUTEX();
706         nfsv4_relref(&nfsv4rootfs_lock);
707         do {
708                 igotlock = nfsv4_lock(&nfsv4rootfs_lock, 1, NULL,
709                     NFSV4ROOTLOCKMUTEXPTR, NULL);
710         } while (igotlock == 0);
711         NFSUNLOCKV4ROOTMUTEX();
712
713         hp = NFSCLIENTHASH(clientid);
714         LIST_FOREACH(clp, hp, lc_hash) {
715                 if (clp->lc_clientid.lval[1] == clientid.lval[1])
716                         break;
717         }
718         if (clp == NULL) {
719                 NFSLOCKV4ROOTMUTEX();
720                 nfsv4_unlock(&nfsv4rootfs_lock, 1);
721                 NFSUNLOCKV4ROOTMUTEX();
722                 /* Just return ok, since it is gone. */
723                 goto out;
724         }
725
726         /* Scan for state on the clientid. */
727         for (i = 0; i < nfsrv_statehashsize; i++)
728                 if (!LIST_EMPTY(&clp->lc_stateid[i])) {
729                         NFSLOCKV4ROOTMUTEX();
730                         nfsv4_unlock(&nfsv4rootfs_lock, 1);
731                         NFSUNLOCKV4ROOTMUTEX();
732                         error = NFSERR_CLIENTIDBUSY;
733                         goto out;
734                 }
735         if (!LIST_EMPTY(&clp->lc_session) || !LIST_EMPTY(&clp->lc_deleg)) {
736                 NFSLOCKV4ROOTMUTEX();
737                 nfsv4_unlock(&nfsv4rootfs_lock, 1);
738                 NFSUNLOCKV4ROOTMUTEX();
739                 error = NFSERR_CLIENTIDBUSY;
740                 goto out;
741         }
742
743         /* Destroy the clientid and return ok. */
744         nfsrv_cleanclient(clp, p);
745         nfsrv_freedeleglist(&clp->lc_deleg);
746         nfsrv_freedeleglist(&clp->lc_olddeleg);
747         LIST_REMOVE(clp, lc_hash);
748         NFSLOCKV4ROOTMUTEX();
749         nfsv4_unlock(&nfsv4rootfs_lock, 1);
750         NFSUNLOCKV4ROOTMUTEX();
751         nfsrv_zapclient(clp, p);
752 out:
753         NFSEXITCODE2(error, nd);
754         return (error);
755 }
756
757 /*
758  * Called from the new nfssvc syscall to admin revoke a clientid.
759  * Returns 0 for success, error otherwise.
760  */
761 APPLESTATIC int
762 nfsrv_adminrevoke(struct nfsd_clid *revokep, NFSPROC_T *p)
763 {
764         struct nfsclient *clp = NULL;
765         int i, error = 0;
766         int gotit, igotlock;
767
768         /*
769          * First, lock out the nfsd so that state won't change while the
770          * revocation record is being written to the stable storage restart
771          * file.
772          */
773         NFSLOCKV4ROOTMUTEX();
774         do {
775                 igotlock = nfsv4_lock(&nfsv4rootfs_lock, 1, NULL,
776                     NFSV4ROOTLOCKMUTEXPTR, NULL);
777         } while (!igotlock);
778         NFSUNLOCKV4ROOTMUTEX();
779
780         /*
781          * Search for a match in the client list.
782          */
783         gotit = i = 0;
784         while (i < nfsrv_clienthashsize && !gotit) {
785             LIST_FOREACH(clp, &nfsclienthash[i], lc_hash) {
786                 if (revokep->nclid_idlen == clp->lc_idlen &&
787                     !NFSBCMP(revokep->nclid_id, clp->lc_id, clp->lc_idlen)) {
788                         gotit = 1;
789                         break;
790                 }
791             }
792             i++;
793         }
794         if (!gotit) {
795                 NFSLOCKV4ROOTMUTEX();
796                 nfsv4_unlock(&nfsv4rootfs_lock, 0);
797                 NFSUNLOCKV4ROOTMUTEX();
798                 error = EPERM;
799                 goto out;
800         }
801
802         /*
803          * Now, write out the revocation record
804          */
805         nfsrv_writestable(clp->lc_id, clp->lc_idlen, NFSNST_REVOKE, p);
806         nfsrv_backupstable();
807
808         /*
809          * and clear out the state, marking the clientid revoked.
810          */
811         clp->lc_flags &= ~LCL_CALLBACKSON;
812         clp->lc_flags |= LCL_ADMINREVOKED;
813         nfsrv_cleanclient(clp, p);
814         nfsrv_freedeleglist(&clp->lc_deleg);
815         nfsrv_freedeleglist(&clp->lc_olddeleg);
816         NFSLOCKV4ROOTMUTEX();
817         nfsv4_unlock(&nfsv4rootfs_lock, 0);
818         NFSUNLOCKV4ROOTMUTEX();
819
820 out:
821         NFSEXITCODE(error);
822         return (error);
823 }
824
825 /*
826  * Dump out stats for all clients. Called from nfssvc(2), that is used
827  * newnfsstats.
828  */
829 APPLESTATIC void
830 nfsrv_dumpclients(struct nfsd_dumpclients *dumpp, int maxcnt)
831 {
832         struct nfsclient *clp;
833         int i = 0, cnt = 0;
834
835         /*
836          * First, get a reference on the nfsv4rootfs_lock so that an
837          * exclusive lock cannot be acquired while dumping the clients.
838          */
839         NFSLOCKV4ROOTMUTEX();
840         nfsv4_getref(&nfsv4rootfs_lock, NULL, NFSV4ROOTLOCKMUTEXPTR, NULL);
841         NFSUNLOCKV4ROOTMUTEX();
842         NFSLOCKSTATE();
843         /*
844          * Rattle through the client lists until done.
845          */
846         while (i < nfsrv_clienthashsize && cnt < maxcnt) {
847             clp = LIST_FIRST(&nfsclienthash[i]);
848             while (clp != LIST_END(&nfsclienthash[i]) && cnt < maxcnt) {
849                 nfsrv_dumpaclient(clp, &dumpp[cnt]);
850                 cnt++;
851                 clp = LIST_NEXT(clp, lc_hash);
852             }
853             i++;
854         }
855         if (cnt < maxcnt)
856             dumpp[cnt].ndcl_clid.nclid_idlen = 0;
857         NFSUNLOCKSTATE();
858         NFSLOCKV4ROOTMUTEX();
859         nfsv4_relref(&nfsv4rootfs_lock);
860         NFSUNLOCKV4ROOTMUTEX();
861 }
862
863 /*
864  * Dump stats for a client. Must be called with the NFSSTATELOCK and spl'd.
865  */
866 static void
867 nfsrv_dumpaclient(struct nfsclient *clp, struct nfsd_dumpclients *dumpp)
868 {
869         struct nfsstate *stp, *openstp, *lckownstp;
870         struct nfslock *lop;
871         struct sockaddr *sad;
872         struct sockaddr_in *rad;
873         struct sockaddr_in6 *rad6;
874
875         dumpp->ndcl_nopenowners = dumpp->ndcl_nlockowners = 0;
876         dumpp->ndcl_nopens = dumpp->ndcl_nlocks = 0;
877         dumpp->ndcl_ndelegs = dumpp->ndcl_nolddelegs = 0;
878         dumpp->ndcl_flags = clp->lc_flags;
879         dumpp->ndcl_clid.nclid_idlen = clp->lc_idlen;
880         NFSBCOPY(clp->lc_id, dumpp->ndcl_clid.nclid_id, clp->lc_idlen);
881         sad = NFSSOCKADDR(clp->lc_req.nr_nam, struct sockaddr *);
882         dumpp->ndcl_addrfam = sad->sa_family;
883         if (sad->sa_family == AF_INET) {
884                 rad = (struct sockaddr_in *)sad;
885                 dumpp->ndcl_cbaddr.sin_addr = rad->sin_addr;
886         } else {
887                 rad6 = (struct sockaddr_in6 *)sad;
888                 dumpp->ndcl_cbaddr.sin6_addr = rad6->sin6_addr;
889         }
890
891         /*
892          * Now, scan the state lists and total up the opens and locks.
893          */
894         LIST_FOREACH(stp, &clp->lc_open, ls_list) {
895             dumpp->ndcl_nopenowners++;
896             LIST_FOREACH(openstp, &stp->ls_open, ls_list) {
897                 dumpp->ndcl_nopens++;
898                 LIST_FOREACH(lckownstp, &openstp->ls_open, ls_list) {
899                     dumpp->ndcl_nlockowners++;
900                     LIST_FOREACH(lop, &lckownstp->ls_lock, lo_lckowner) {
901                         dumpp->ndcl_nlocks++;
902                     }
903                 }
904             }
905         }
906
907         /*
908          * and the delegation lists.
909          */
910         LIST_FOREACH(stp, &clp->lc_deleg, ls_list) {
911             dumpp->ndcl_ndelegs++;
912         }
913         LIST_FOREACH(stp, &clp->lc_olddeleg, ls_list) {
914             dumpp->ndcl_nolddelegs++;
915         }
916 }
917
918 /*
919  * Dump out lock stats for a file.
920  */
921 APPLESTATIC void
922 nfsrv_dumplocks(vnode_t vp, struct nfsd_dumplocks *ldumpp, int maxcnt,
923     NFSPROC_T *p)
924 {
925         struct nfsstate *stp;
926         struct nfslock *lop;
927         int cnt = 0;
928         struct nfslockfile *lfp;
929         struct sockaddr *sad;
930         struct sockaddr_in *rad;
931         struct sockaddr_in6 *rad6;
932         int ret;
933         fhandle_t nfh;
934
935         ret = nfsrv_getlockfh(vp, 0, NULL, &nfh, p);
936         /*
937          * First, get a reference on the nfsv4rootfs_lock so that an
938          * exclusive lock on it cannot be acquired while dumping the locks.
939          */
940         NFSLOCKV4ROOTMUTEX();
941         nfsv4_getref(&nfsv4rootfs_lock, NULL, NFSV4ROOTLOCKMUTEXPTR, NULL);
942         NFSUNLOCKV4ROOTMUTEX();
943         NFSLOCKSTATE();
944         if (!ret)
945                 ret = nfsrv_getlockfile(0, NULL, &lfp, &nfh, 0);
946         if (ret) {
947                 ldumpp[0].ndlck_clid.nclid_idlen = 0;
948                 NFSUNLOCKSTATE();
949                 NFSLOCKV4ROOTMUTEX();
950                 nfsv4_relref(&nfsv4rootfs_lock);
951                 NFSUNLOCKV4ROOTMUTEX();
952                 return;
953         }
954
955         /*
956          * For each open share on file, dump it out.
957          */
958         stp = LIST_FIRST(&lfp->lf_open);
959         while (stp != LIST_END(&lfp->lf_open) && cnt < maxcnt) {
960                 ldumpp[cnt].ndlck_flags = stp->ls_flags;
961                 ldumpp[cnt].ndlck_stateid.seqid = stp->ls_stateid.seqid;
962                 ldumpp[cnt].ndlck_stateid.other[0] = stp->ls_stateid.other[0];
963                 ldumpp[cnt].ndlck_stateid.other[1] = stp->ls_stateid.other[1];
964                 ldumpp[cnt].ndlck_stateid.other[2] = stp->ls_stateid.other[2];
965                 ldumpp[cnt].ndlck_owner.nclid_idlen =
966                     stp->ls_openowner->ls_ownerlen;
967                 NFSBCOPY(stp->ls_openowner->ls_owner,
968                     ldumpp[cnt].ndlck_owner.nclid_id,
969                     stp->ls_openowner->ls_ownerlen);
970                 ldumpp[cnt].ndlck_clid.nclid_idlen = stp->ls_clp->lc_idlen;
971                 NFSBCOPY(stp->ls_clp->lc_id, ldumpp[cnt].ndlck_clid.nclid_id,
972                     stp->ls_clp->lc_idlen);
973                 sad=NFSSOCKADDR(stp->ls_clp->lc_req.nr_nam, struct sockaddr *);
974                 ldumpp[cnt].ndlck_addrfam = sad->sa_family;
975                 if (sad->sa_family == AF_INET) {
976                         rad = (struct sockaddr_in *)sad;
977                         ldumpp[cnt].ndlck_cbaddr.sin_addr = rad->sin_addr;
978                 } else {
979                         rad6 = (struct sockaddr_in6 *)sad;
980                         ldumpp[cnt].ndlck_cbaddr.sin6_addr = rad6->sin6_addr;
981                 }
982                 stp = LIST_NEXT(stp, ls_file);
983                 cnt++;
984         }
985
986         /*
987          * and all locks.
988          */
989         lop = LIST_FIRST(&lfp->lf_lock);
990         while (lop != LIST_END(&lfp->lf_lock) && cnt < maxcnt) {
991                 stp = lop->lo_stp;
992                 ldumpp[cnt].ndlck_flags = lop->lo_flags;
993                 ldumpp[cnt].ndlck_first = lop->lo_first;
994                 ldumpp[cnt].ndlck_end = lop->lo_end;
995                 ldumpp[cnt].ndlck_stateid.seqid = stp->ls_stateid.seqid;
996                 ldumpp[cnt].ndlck_stateid.other[0] = stp->ls_stateid.other[0];
997                 ldumpp[cnt].ndlck_stateid.other[1] = stp->ls_stateid.other[1];
998                 ldumpp[cnt].ndlck_stateid.other[2] = stp->ls_stateid.other[2];
999                 ldumpp[cnt].ndlck_owner.nclid_idlen = stp->ls_ownerlen;
1000                 NFSBCOPY(stp->ls_owner, ldumpp[cnt].ndlck_owner.nclid_id,
1001                     stp->ls_ownerlen);
1002                 ldumpp[cnt].ndlck_clid.nclid_idlen = stp->ls_clp->lc_idlen;
1003                 NFSBCOPY(stp->ls_clp->lc_id, ldumpp[cnt].ndlck_clid.nclid_id,
1004                     stp->ls_clp->lc_idlen);
1005                 sad=NFSSOCKADDR(stp->ls_clp->lc_req.nr_nam, struct sockaddr *);
1006                 ldumpp[cnt].ndlck_addrfam = sad->sa_family;
1007                 if (sad->sa_family == AF_INET) {
1008                         rad = (struct sockaddr_in *)sad;
1009                         ldumpp[cnt].ndlck_cbaddr.sin_addr = rad->sin_addr;
1010                 } else {
1011                         rad6 = (struct sockaddr_in6 *)sad;
1012                         ldumpp[cnt].ndlck_cbaddr.sin6_addr = rad6->sin6_addr;
1013                 }
1014                 lop = LIST_NEXT(lop, lo_lckfile);
1015                 cnt++;
1016         }
1017
1018         /*
1019          * and the delegations.
1020          */
1021         stp = LIST_FIRST(&lfp->lf_deleg);
1022         while (stp != LIST_END(&lfp->lf_deleg) && cnt < maxcnt) {
1023                 ldumpp[cnt].ndlck_flags = stp->ls_flags;
1024                 ldumpp[cnt].ndlck_stateid.seqid = stp->ls_stateid.seqid;
1025                 ldumpp[cnt].ndlck_stateid.other[0] = stp->ls_stateid.other[0];
1026                 ldumpp[cnt].ndlck_stateid.other[1] = stp->ls_stateid.other[1];
1027                 ldumpp[cnt].ndlck_stateid.other[2] = stp->ls_stateid.other[2];
1028                 ldumpp[cnt].ndlck_owner.nclid_idlen = 0;
1029                 ldumpp[cnt].ndlck_clid.nclid_idlen = stp->ls_clp->lc_idlen;
1030                 NFSBCOPY(stp->ls_clp->lc_id, ldumpp[cnt].ndlck_clid.nclid_id,
1031                     stp->ls_clp->lc_idlen);
1032                 sad=NFSSOCKADDR(stp->ls_clp->lc_req.nr_nam, struct sockaddr *);
1033                 ldumpp[cnt].ndlck_addrfam = sad->sa_family;
1034                 if (sad->sa_family == AF_INET) {
1035                         rad = (struct sockaddr_in *)sad;
1036                         ldumpp[cnt].ndlck_cbaddr.sin_addr = rad->sin_addr;
1037                 } else {
1038                         rad6 = (struct sockaddr_in6 *)sad;
1039                         ldumpp[cnt].ndlck_cbaddr.sin6_addr = rad6->sin6_addr;
1040                 }
1041                 stp = LIST_NEXT(stp, ls_file);
1042                 cnt++;
1043         }
1044
1045         /*
1046          * If list isn't full, mark end of list by setting the client name
1047          * to zero length.
1048          */
1049         if (cnt < maxcnt)
1050                 ldumpp[cnt].ndlck_clid.nclid_idlen = 0;
1051         NFSUNLOCKSTATE();
1052         NFSLOCKV4ROOTMUTEX();
1053         nfsv4_relref(&nfsv4rootfs_lock);
1054         NFSUNLOCKV4ROOTMUTEX();
1055 }
1056
1057 /*
1058  * Server timer routine. It can scan any linked list, so long
1059  * as it holds the spin/mutex lock and there is no exclusive lock on
1060  * nfsv4rootfs_lock.
1061  * (For OpenBSD, a kthread is ok. For FreeBSD, I think it is ok
1062  *  to do this from a callout, since the spin locks work. For
1063  *  Darwin, I'm not sure what will work correctly yet.)
1064  * Should be called once per second.
1065  */
1066 APPLESTATIC void
1067 nfsrv_servertimer(void)
1068 {
1069         struct nfsclient *clp, *nclp;
1070         struct nfsstate *stp, *nstp;
1071         int got_ref, i;
1072
1073         /*
1074          * Make sure nfsboottime is set. This is used by V3 as well
1075          * as V4. Note that nfsboottime is not nfsrvboottime, which is
1076          * only used by the V4 server for leases.
1077          */
1078         if (nfsboottime.tv_sec == 0)
1079                 NFSSETBOOTTIME(nfsboottime);
1080
1081         /*
1082          * If server hasn't started yet, just return.
1083          */
1084         NFSLOCKSTATE();
1085         if (nfsrv_stablefirst.nsf_eograce == 0) {
1086                 NFSUNLOCKSTATE();
1087                 return;
1088         }
1089         if (!(nfsrv_stablefirst.nsf_flags & NFSNSF_UPDATEDONE)) {
1090                 if (!(nfsrv_stablefirst.nsf_flags & NFSNSF_GRACEOVER) &&
1091                     NFSD_MONOSEC > nfsrv_stablefirst.nsf_eograce)
1092                         nfsrv_stablefirst.nsf_flags |=
1093                             (NFSNSF_GRACEOVER | NFSNSF_NEEDLOCK);
1094                 NFSUNLOCKSTATE();
1095                 return;
1096         }
1097
1098         /*
1099          * Try and get a reference count on the nfsv4rootfs_lock so that
1100          * no nfsd thread can acquire an exclusive lock on it before this
1101          * call is done. If it is already exclusively locked, just return.
1102          */
1103         NFSLOCKV4ROOTMUTEX();
1104         got_ref = nfsv4_getref_nonblock(&nfsv4rootfs_lock);
1105         NFSUNLOCKV4ROOTMUTEX();
1106         if (got_ref == 0) {
1107                 NFSUNLOCKSTATE();
1108                 return;
1109         }
1110
1111         /*
1112          * For each client...
1113          */
1114         for (i = 0; i < nfsrv_clienthashsize; i++) {
1115             clp = LIST_FIRST(&nfsclienthash[i]);
1116             while (clp != LIST_END(&nfsclienthash[i])) {
1117                 nclp = LIST_NEXT(clp, lc_hash);
1118                 if (!(clp->lc_flags & LCL_EXPIREIT)) {
1119                     if (((clp->lc_expiry + NFSRV_STALELEASE) < NFSD_MONOSEC
1120                          && ((LIST_EMPTY(&clp->lc_deleg)
1121                               && LIST_EMPTY(&clp->lc_open)) ||
1122                              nfsrv_clients > nfsrv_clienthighwater)) ||
1123                         (clp->lc_expiry + NFSRV_MOULDYLEASE) < NFSD_MONOSEC ||
1124                         (clp->lc_expiry < NFSD_MONOSEC &&
1125                          (nfsrv_openpluslock * 10 / 9) > nfsrv_v4statelimit)) {
1126                         /*
1127                          * Lease has expired several nfsrv_lease times ago:
1128                          * PLUS
1129                          *    - no state is associated with it
1130                          *    OR
1131                          *    - above high water mark for number of clients
1132                          *      (nfsrv_clienthighwater should be large enough
1133                          *       that this only occurs when clients fail to
1134                          *       use the same nfs_client_id4.id. Maybe somewhat
1135                          *       higher that the maximum number of clients that
1136                          *       will mount this server?)
1137                          * OR
1138                          * Lease has expired a very long time ago
1139                          * OR
1140                          * Lease has expired PLUS the number of opens + locks
1141                          * has exceeded 90% of capacity
1142                          *
1143                          * --> Mark for expiry. The actual expiry will be done
1144                          *     by an nfsd sometime soon.
1145                          */
1146                         clp->lc_flags |= LCL_EXPIREIT;
1147                         nfsrv_stablefirst.nsf_flags |=
1148                             (NFSNSF_NEEDLOCK | NFSNSF_EXPIREDCLIENT);
1149                     } else {
1150                         /*
1151                          * If there are no opens, increment no open tick cnt
1152                          * If time exceeds NFSNOOPEN, mark it to be thrown away
1153                          * otherwise, if there is an open, reset no open time
1154                          * Hopefully, this will avoid excessive re-creation
1155                          * of open owners and subsequent open confirms.
1156                          */
1157                         stp = LIST_FIRST(&clp->lc_open);
1158                         while (stp != LIST_END(&clp->lc_open)) {
1159                                 nstp = LIST_NEXT(stp, ls_list);
1160                                 if (LIST_EMPTY(&stp->ls_open)) {
1161                                         stp->ls_noopens++;
1162                                         if (stp->ls_noopens > NFSNOOPEN ||
1163                                             (nfsrv_openpluslock * 2) >
1164                                             nfsrv_v4statelimit)
1165                                                 nfsrv_stablefirst.nsf_flags |=
1166                                                         NFSNSF_NOOPENS;
1167                                 } else {
1168                                         stp->ls_noopens = 0;
1169                                 }
1170                                 stp = nstp;
1171                         }
1172                     }
1173                 }
1174                 clp = nclp;
1175             }
1176         }
1177         NFSUNLOCKSTATE();
1178         NFSLOCKV4ROOTMUTEX();
1179         nfsv4_relref(&nfsv4rootfs_lock);
1180         NFSUNLOCKV4ROOTMUTEX();
1181 }
1182
1183 /*
1184  * The following set of functions free up the various data structures.
1185  */
1186 /*
1187  * Clear out all open/lock state related to this nfsclient.
1188  * Caller must hold an exclusive lock on nfsv4rootfs_lock, so that
1189  * there are no other active nfsd threads.
1190  */
1191 APPLESTATIC void
1192 nfsrv_cleanclient(struct nfsclient *clp, NFSPROC_T *p)
1193 {
1194         struct nfsstate *stp, *nstp;
1195         struct nfsdsession *sep, *nsep;
1196
1197         LIST_FOREACH_SAFE(stp, &clp->lc_open, ls_list, nstp)
1198                 nfsrv_freeopenowner(stp, 1, p);
1199         if ((clp->lc_flags & LCL_ADMINREVOKED) == 0)
1200                 LIST_FOREACH_SAFE(sep, &clp->lc_session, sess_list, nsep)
1201                         (void)nfsrv_freesession(sep, NULL);
1202 }
1203
1204 /*
1205  * Free a client that has been cleaned. It should also already have been
1206  * removed from the lists.
1207  * (Just to be safe w.r.t. newnfs_disconnect(), call this function when
1208  *  softclock interrupts are enabled.)
1209  */
1210 APPLESTATIC void
1211 nfsrv_zapclient(struct nfsclient *clp, NFSPROC_T *p)
1212 {
1213
1214 #ifdef notyet
1215         if ((clp->lc_flags & (LCL_GSS | LCL_CALLBACKSON)) ==
1216              (LCL_GSS | LCL_CALLBACKSON) &&
1217             (clp->lc_hand.nfsh_flag & NFSG_COMPLETE) &&
1218             clp->lc_handlelen > 0) {
1219                 clp->lc_hand.nfsh_flag &= ~NFSG_COMPLETE;
1220                 clp->lc_hand.nfsh_flag |= NFSG_DESTROYED;
1221                 (void) nfsrv_docallback(clp, NFSV4PROC_CBNULL,
1222                         NULL, 0, NULL, NULL, NULL, p);
1223         }
1224 #endif
1225         newnfs_disconnect(&clp->lc_req);
1226         NFSSOCKADDRFREE(clp->lc_req.nr_nam);
1227         NFSFREEMUTEX(&clp->lc_req.nr_mtx);
1228         free(clp->lc_stateid, M_NFSDCLIENT);
1229         free(clp, M_NFSDCLIENT);
1230         NFSLOCKSTATE();
1231         newnfsstats.srvclients--;
1232         nfsrv_openpluslock--;
1233         nfsrv_clients--;
1234         NFSUNLOCKSTATE();
1235 }
1236
1237 /*
1238  * Free a list of delegation state structures.
1239  * (This function will also free all nfslockfile structures that no
1240  *  longer have associated state.)
1241  */
1242 APPLESTATIC void
1243 nfsrv_freedeleglist(struct nfsstatehead *sthp)
1244 {
1245         struct nfsstate *stp, *nstp;
1246
1247         LIST_FOREACH_SAFE(stp, sthp, ls_list, nstp) {
1248                 nfsrv_freedeleg(stp);
1249         }
1250         LIST_INIT(sthp);
1251 }
1252
1253 /*
1254  * Free up a delegation.
1255  */
1256 static void
1257 nfsrv_freedeleg(struct nfsstate *stp)
1258 {
1259         struct nfslockfile *lfp;
1260
1261         LIST_REMOVE(stp, ls_hash);
1262         LIST_REMOVE(stp, ls_list);
1263         LIST_REMOVE(stp, ls_file);
1264         lfp = stp->ls_lfp;
1265         if (LIST_EMPTY(&lfp->lf_open) &&
1266             LIST_EMPTY(&lfp->lf_lock) && LIST_EMPTY(&lfp->lf_deleg) &&
1267             LIST_EMPTY(&lfp->lf_locallock) && LIST_EMPTY(&lfp->lf_rollback) &&
1268             lfp->lf_usecount == 0 &&
1269             nfsv4_testlock(&lfp->lf_locallock_lck) == 0)
1270                 nfsrv_freenfslockfile(lfp);
1271         FREE((caddr_t)stp, M_NFSDSTATE);
1272         newnfsstats.srvdelegates--;
1273         nfsrv_openpluslock--;
1274         nfsrv_delegatecnt--;
1275 }
1276
1277 /*
1278  * This function frees an open owner and all associated opens.
1279  */
1280 static void
1281 nfsrv_freeopenowner(struct nfsstate *stp, int cansleep, NFSPROC_T *p)
1282 {
1283         struct nfsstate *nstp, *tstp;
1284
1285         LIST_REMOVE(stp, ls_list);
1286         /*
1287          * Now, free all associated opens.
1288          */
1289         nstp = LIST_FIRST(&stp->ls_open);
1290         while (nstp != LIST_END(&stp->ls_open)) {
1291                 tstp = nstp;
1292                 nstp = LIST_NEXT(nstp, ls_list);
1293                 (void) nfsrv_freeopen(tstp, NULL, cansleep, p);
1294         }
1295         if (stp->ls_op)
1296                 nfsrvd_derefcache(stp->ls_op);
1297         FREE((caddr_t)stp, M_NFSDSTATE);
1298         newnfsstats.srvopenowners--;
1299         nfsrv_openpluslock--;
1300 }
1301
1302 /*
1303  * This function frees an open (nfsstate open structure) with all associated
1304  * lock_owners and locks. It also frees the nfslockfile structure iff there
1305  * are no other opens on the file.
1306  * Returns 1 if it free'd the nfslockfile, 0 otherwise.
1307  */
1308 static int
1309 nfsrv_freeopen(struct nfsstate *stp, vnode_t vp, int cansleep, NFSPROC_T *p)
1310 {
1311         struct nfsstate *nstp, *tstp;
1312         struct nfslockfile *lfp;
1313         int ret;
1314
1315         LIST_REMOVE(stp, ls_hash);
1316         LIST_REMOVE(stp, ls_list);
1317         LIST_REMOVE(stp, ls_file);
1318
1319         lfp = stp->ls_lfp;
1320         /*
1321          * Now, free all lockowners associated with this open.
1322          */
1323         LIST_FOREACH_SAFE(tstp, &stp->ls_open, ls_list, nstp)
1324                 nfsrv_freelockowner(tstp, vp, cansleep, p);
1325
1326         /*
1327          * The nfslockfile is freed here if there are no locks
1328          * associated with the open.
1329          * If there are locks associated with the open, the
1330          * nfslockfile structure can be freed via nfsrv_freelockowner().
1331          * Acquire the state mutex to avoid races with calls to
1332          * nfsrv_getlockfile().
1333          */
1334         if (cansleep != 0)
1335                 NFSLOCKSTATE();
1336         if (lfp != NULL && LIST_EMPTY(&lfp->lf_open) &&
1337             LIST_EMPTY(&lfp->lf_deleg) && LIST_EMPTY(&lfp->lf_lock) &&
1338             LIST_EMPTY(&lfp->lf_locallock) && LIST_EMPTY(&lfp->lf_rollback) &&
1339             lfp->lf_usecount == 0 &&
1340             (cansleep != 0 || nfsv4_testlock(&lfp->lf_locallock_lck) == 0)) {
1341                 nfsrv_freenfslockfile(lfp);
1342                 ret = 1;
1343         } else
1344                 ret = 0;
1345         if (cansleep != 0)
1346                 NFSUNLOCKSTATE();
1347         FREE((caddr_t)stp, M_NFSDSTATE);
1348         newnfsstats.srvopens--;
1349         nfsrv_openpluslock--;
1350         return (ret);
1351 }
1352
1353 /*
1354  * Frees a lockowner and all associated locks.
1355  */
1356 static void
1357 nfsrv_freelockowner(struct nfsstate *stp, vnode_t vp, int cansleep,
1358     NFSPROC_T *p)
1359 {
1360
1361         LIST_REMOVE(stp, ls_hash);
1362         LIST_REMOVE(stp, ls_list);
1363         nfsrv_freeallnfslocks(stp, vp, cansleep, p);
1364         if (stp->ls_op)
1365                 nfsrvd_derefcache(stp->ls_op);
1366         FREE((caddr_t)stp, M_NFSDSTATE);
1367         newnfsstats.srvlockowners--;
1368         nfsrv_openpluslock--;
1369 }
1370
1371 /*
1372  * Free all the nfs locks on a lockowner.
1373  */
1374 static void
1375 nfsrv_freeallnfslocks(struct nfsstate *stp, vnode_t vp, int cansleep,
1376     NFSPROC_T *p)
1377 {
1378         struct nfslock *lop, *nlop;
1379         struct nfsrollback *rlp, *nrlp;
1380         struct nfslockfile *lfp = NULL;
1381         int gottvp = 0;
1382         vnode_t tvp = NULL;
1383         uint64_t first, end;
1384
1385         if (vp != NULL)
1386                 ASSERT_VOP_UNLOCKED(vp, "nfsrv_freeallnfslocks: vnode locked");
1387         lop = LIST_FIRST(&stp->ls_lock);
1388         while (lop != LIST_END(&stp->ls_lock)) {
1389                 nlop = LIST_NEXT(lop, lo_lckowner);
1390                 /*
1391                  * Since all locks should be for the same file, lfp should
1392                  * not change.
1393                  */
1394                 if (lfp == NULL)
1395                         lfp = lop->lo_lfp;
1396                 else if (lfp != lop->lo_lfp)
1397                         panic("allnfslocks");
1398                 /*
1399                  * If vp is NULL and cansleep != 0, a vnode must be acquired
1400                  * from the file handle. This only occurs when called from
1401                  * nfsrv_cleanclient().
1402                  */
1403                 if (gottvp == 0) {
1404                         if (nfsrv_dolocallocks == 0)
1405                                 tvp = NULL;
1406                         else if (vp == NULL && cansleep != 0) {
1407                                 tvp = nfsvno_getvp(&lfp->lf_fh);
1408                                 NFSVOPUNLOCK(tvp, 0);
1409                         } else
1410                                 tvp = vp;
1411                         gottvp = 1;
1412                 }
1413
1414                 if (tvp != NULL) {
1415                         if (cansleep == 0)
1416                                 panic("allnfs2");
1417                         first = lop->lo_first;
1418                         end = lop->lo_end;
1419                         nfsrv_freenfslock(lop);
1420                         nfsrv_localunlock(tvp, lfp, first, end, p);
1421                         LIST_FOREACH_SAFE(rlp, &lfp->lf_rollback, rlck_list,
1422                             nrlp)
1423                                 free(rlp, M_NFSDROLLBACK);
1424                         LIST_INIT(&lfp->lf_rollback);
1425                 } else
1426                         nfsrv_freenfslock(lop);
1427                 lop = nlop;
1428         }
1429         if (vp == NULL && tvp != NULL)
1430                 vrele(tvp);
1431 }
1432
1433 /*
1434  * Free an nfslock structure.
1435  */
1436 static void
1437 nfsrv_freenfslock(struct nfslock *lop)
1438 {
1439
1440         if (lop->lo_lckfile.le_prev != NULL) {
1441                 LIST_REMOVE(lop, lo_lckfile);
1442                 newnfsstats.srvlocks--;
1443                 nfsrv_openpluslock--;
1444         }
1445         LIST_REMOVE(lop, lo_lckowner);
1446         FREE((caddr_t)lop, M_NFSDLOCK);
1447 }
1448
1449 /*
1450  * This function frees an nfslockfile structure.
1451  */
1452 static void
1453 nfsrv_freenfslockfile(struct nfslockfile *lfp)
1454 {
1455
1456         LIST_REMOVE(lfp, lf_hash);
1457         FREE((caddr_t)lfp, M_NFSDLOCKFILE);
1458 }
1459
1460 /*
1461  * This function looks up an nfsstate structure via stateid.
1462  */
1463 static int
1464 nfsrv_getstate(struct nfsclient *clp, nfsv4stateid_t *stateidp, __unused u_int32_t flags,
1465     struct nfsstate **stpp)
1466 {
1467         struct nfsstate *stp;
1468         struct nfsstatehead *hp;
1469         int error = 0;
1470
1471         *stpp = NULL;
1472         hp = NFSSTATEHASH(clp, *stateidp);
1473         LIST_FOREACH(stp, hp, ls_hash) {
1474                 if (!NFSBCMP(stp->ls_stateid.other, stateidp->other,
1475                         NFSX_STATEIDOTHER))
1476                         break;
1477         }
1478
1479         /*
1480          * If no state id in list, return NFSERR_BADSTATEID.
1481          */
1482         if (stp == LIST_END(hp)) {
1483                 error = NFSERR_BADSTATEID;
1484                 goto out;
1485         }
1486         *stpp = stp;
1487
1488 out:
1489         NFSEXITCODE(error);
1490         return (error);
1491 }
1492
1493 /*
1494  * This function gets an nfsstate structure via owner string.
1495  */
1496 static void
1497 nfsrv_getowner(struct nfsstatehead *hp, struct nfsstate *new_stp,
1498     struct nfsstate **stpp)
1499 {
1500         struct nfsstate *stp;
1501
1502         *stpp = NULL;
1503         LIST_FOREACH(stp, hp, ls_list) {
1504                 if (new_stp->ls_ownerlen == stp->ls_ownerlen &&
1505                   !NFSBCMP(new_stp->ls_owner,stp->ls_owner,stp->ls_ownerlen)) {
1506                         *stpp = stp;
1507                         return;
1508                 }
1509         }
1510 }
1511
1512 /*
1513  * Lock control function called to update lock status.
1514  * Returns 0 upon success, -1 if there is no lock and the flags indicate
1515  * that one isn't to be created and an NFSERR_xxx for other errors.
1516  * The structures new_stp and new_lop are passed in as pointers that should
1517  * be set to NULL if the structure is used and shouldn't be free'd.
1518  * For the NFSLCK_TEST and NFSLCK_CHECK cases, the structures are
1519  * never used and can safely be allocated on the stack. For all other
1520  * cases, *new_stpp and *new_lopp should be malloc'd before the call,
1521  * in case they are used.
1522  */
1523 APPLESTATIC int
1524 nfsrv_lockctrl(vnode_t vp, struct nfsstate **new_stpp,
1525     struct nfslock **new_lopp, struct nfslockconflict *cfp,
1526     nfsquad_t clientid, nfsv4stateid_t *stateidp,
1527     __unused struct nfsexstuff *exp,
1528     struct nfsrv_descript *nd, NFSPROC_T *p)
1529 {
1530         struct nfslock *lop;
1531         struct nfsstate *new_stp = *new_stpp;
1532         struct nfslock *new_lop = *new_lopp;
1533         struct nfsstate *tstp, *mystp, *nstp;
1534         int specialid = 0;
1535         struct nfslockfile *lfp;
1536         struct nfslock *other_lop = NULL;
1537         struct nfsstate *stp, *lckstp = NULL;
1538         struct nfsclient *clp = NULL;
1539         u_int32_t bits;
1540         int error = 0, haslock = 0, ret, reterr;
1541         int getlckret, delegation = 0, filestruct_locked, vnode_unlocked = 0;
1542         fhandle_t nfh;
1543         uint64_t first, end;
1544         uint32_t lock_flags;
1545
1546         if (new_stp->ls_flags & (NFSLCK_CHECK | NFSLCK_SETATTR)) {
1547                 /*
1548                  * Note the special cases of "all 1s" or "all 0s" stateids and
1549                  * let reads with all 1s go ahead.
1550                  */
1551                 if (new_stp->ls_stateid.seqid == 0x0 &&
1552                     new_stp->ls_stateid.other[0] == 0x0 &&
1553                     new_stp->ls_stateid.other[1] == 0x0 &&
1554                     new_stp->ls_stateid.other[2] == 0x0)
1555                         specialid = 1;
1556                 else if (new_stp->ls_stateid.seqid == 0xffffffff &&
1557                     new_stp->ls_stateid.other[0] == 0xffffffff &&
1558                     new_stp->ls_stateid.other[1] == 0xffffffff &&
1559                     new_stp->ls_stateid.other[2] == 0xffffffff)
1560                         specialid = 2;
1561         }
1562
1563         /*
1564          * Check for restart conditions (client and server).
1565          */
1566         error = nfsrv_checkrestart(clientid, new_stp->ls_flags,
1567             &new_stp->ls_stateid, specialid);
1568         if (error)
1569                 goto out;
1570
1571         /*
1572          * Check for state resource limit exceeded.
1573          */
1574         if ((new_stp->ls_flags & NFSLCK_LOCK) &&
1575             nfsrv_openpluslock > nfsrv_v4statelimit) {
1576                 error = NFSERR_RESOURCE;
1577                 goto out;
1578         }
1579
1580         /*
1581          * For the lock case, get another nfslock structure,
1582          * just in case we need it.
1583          * Malloc now, before we start sifting through the linked lists,
1584          * in case we have to wait for memory.
1585          */
1586 tryagain:
1587         if (new_stp->ls_flags & NFSLCK_LOCK)
1588                 MALLOC(other_lop, struct nfslock *, sizeof (struct nfslock),
1589                     M_NFSDLOCK, M_WAITOK);
1590         filestruct_locked = 0;
1591         reterr = 0;
1592         lfp = NULL;
1593
1594         /*
1595          * Get the lockfile structure for CFH now, so we can do a sanity
1596          * check against the stateid, before incrementing the seqid#, since
1597          * we want to return NFSERR_BADSTATEID on failure and the seqid#
1598          * shouldn't be incremented for this case.
1599          * If nfsrv_getlockfile() returns -1, it means "not found", which
1600          * will be handled later.
1601          * If we are doing Lock/LockU and local locking is enabled, sleep
1602          * lock the nfslockfile structure.
1603          */
1604         getlckret = nfsrv_getlockfh(vp, new_stp->ls_flags, NULL, &nfh, p);
1605         NFSLOCKSTATE();
1606         if (getlckret == 0) {
1607                 if ((new_stp->ls_flags & (NFSLCK_LOCK | NFSLCK_UNLOCK)) != 0 &&
1608                     nfsrv_dolocallocks != 0 && nd->nd_repstat == 0) {
1609                         getlckret = nfsrv_getlockfile(new_stp->ls_flags, NULL,
1610                             &lfp, &nfh, 1);
1611                         if (getlckret == 0)
1612                                 filestruct_locked = 1;
1613                 } else
1614                         getlckret = nfsrv_getlockfile(new_stp->ls_flags, NULL,
1615                             &lfp, &nfh, 0);
1616         }
1617         if (getlckret != 0 && getlckret != -1)
1618                 reterr = getlckret;
1619
1620         if (filestruct_locked != 0) {
1621                 LIST_INIT(&lfp->lf_rollback);
1622                 if ((new_stp->ls_flags & NFSLCK_LOCK)) {
1623                         /*
1624                          * For local locking, do the advisory locking now, so
1625                          * that any conflict can be detected. A failure later
1626                          * can be rolled back locally. If an error is returned,
1627                          * struct nfslockfile has been unlocked and any local
1628                          * locking rolled back.
1629                          */
1630                         NFSUNLOCKSTATE();
1631                         if (vnode_unlocked == 0) {
1632                                 ASSERT_VOP_ELOCKED(vp, "nfsrv_lockctrl1");
1633                                 vnode_unlocked = 1;
1634                                 NFSVOPUNLOCK(vp, 0);
1635                         }
1636                         reterr = nfsrv_locallock(vp, lfp,
1637                             (new_lop->lo_flags & (NFSLCK_READ | NFSLCK_WRITE)),
1638                             new_lop->lo_first, new_lop->lo_end, cfp, p);
1639                         NFSLOCKSTATE();
1640                 }
1641         }
1642
1643         if (specialid == 0) {
1644             if (new_stp->ls_flags & NFSLCK_TEST) {
1645                 /*
1646                  * RFC 3530 does not list LockT as an op that renews a
1647                  * lease, but the concensus seems to be that it is ok
1648                  * for a server to do so.
1649                  */
1650                 error = nfsrv_getclient(clientid, CLOPS_RENEW, &clp, NULL,
1651                     (nfsquad_t)((u_quad_t)0), 0, nd, p);
1652
1653                 /*
1654                  * Since NFSERR_EXPIRED, NFSERR_ADMINREVOKED are not valid
1655                  * error returns for LockT, just go ahead and test for a lock,
1656                  * since there are no locks for this client, but other locks
1657                  * can conflict. (ie. same client will always be false)
1658                  */
1659                 if (error == NFSERR_EXPIRED || error == NFSERR_ADMINREVOKED)
1660                     error = 0;
1661                 lckstp = new_stp;
1662             } else {
1663               error = nfsrv_getclient(clientid, CLOPS_RENEW, &clp, NULL,
1664                 (nfsquad_t)((u_quad_t)0), 0, nd, p);
1665               if (error == 0)
1666                 /*
1667                  * Look up the stateid
1668                  */
1669                 error = nfsrv_getstate(clp, &new_stp->ls_stateid,
1670                   new_stp->ls_flags, &stp);
1671               /*
1672                * do some sanity checks for an unconfirmed open or a
1673                * stateid that refers to the wrong file, for an open stateid
1674                */
1675               if (error == 0 && (stp->ls_flags & NFSLCK_OPEN) &&
1676                   ((stp->ls_openowner->ls_flags & NFSLCK_NEEDSCONFIRM) ||
1677                    (getlckret == 0 && stp->ls_lfp != lfp)))
1678                         error = NFSERR_BADSTATEID;
1679               if (error == 0 &&
1680                   (stp->ls_flags & (NFSLCK_DELEGREAD | NFSLCK_DELEGWRITE)) &&
1681                   getlckret == 0 && stp->ls_lfp != lfp)
1682                         error = NFSERR_BADSTATEID;
1683
1684               /*
1685                * If the lockowner stateid doesn't refer to the same file,
1686                * I believe that is considered ok, since some clients will
1687                * only create a single lockowner and use that for all locks
1688                * on all files.
1689                * For now, log it as a diagnostic, instead of considering it
1690                * a BadStateid.
1691                */
1692               if (error == 0 && (stp->ls_flags &
1693                   (NFSLCK_OPEN | NFSLCK_DELEGREAD | NFSLCK_DELEGWRITE)) == 0 &&
1694                   getlckret == 0 && stp->ls_lfp != lfp) {
1695 #ifdef DIAGNOSTIC
1696                   printf("Got a lock statid for different file open\n");
1697 #endif
1698                   /*
1699                   error = NFSERR_BADSTATEID;
1700                   */
1701               }
1702
1703               if (error == 0) {
1704                     if (new_stp->ls_flags & NFSLCK_OPENTOLOCK) {
1705                         /*
1706                          * If haslock set, we've already checked the seqid.
1707                          */
1708                         if (!haslock) {
1709                             if (stp->ls_flags & NFSLCK_OPEN)
1710                                 error = nfsrv_checkseqid(nd, new_stp->ls_seq,
1711                                     stp->ls_openowner, new_stp->ls_op);
1712                             else
1713                                 error = NFSERR_BADSTATEID;
1714                         }
1715                         if (!error)
1716                             nfsrv_getowner(&stp->ls_open, new_stp, &lckstp);
1717                         if (lckstp)
1718                             /*
1719                              * I believe this should be an error, but it
1720                              * isn't obvious what NFSERR_xxx would be
1721                              * appropriate, so I'll use NFSERR_INVAL for now.
1722                              */
1723                             error = NFSERR_INVAL;
1724                         else
1725                             lckstp = new_stp;
1726                     } else if (new_stp->ls_flags&(NFSLCK_LOCK|NFSLCK_UNLOCK)) {
1727                         /*
1728                          * If haslock set, ditto above.
1729                          */
1730                         if (!haslock) {
1731                             if (stp->ls_flags & NFSLCK_OPEN)
1732                                 error = NFSERR_BADSTATEID;
1733                             else
1734                                 error = nfsrv_checkseqid(nd, new_stp->ls_seq,
1735                                     stp, new_stp->ls_op);
1736                         }
1737                         lckstp = stp;
1738                     } else {
1739                         lckstp = stp;
1740                     }
1741               }
1742               /*
1743                * If the seqid part of the stateid isn't the same, return
1744                * NFSERR_OLDSTATEID for cases other than I/O Ops.
1745                * For I/O Ops, only return NFSERR_OLDSTATEID if
1746                * nfsrv_returnoldstateid is set. (The concensus on the email
1747                * list was that most clients would prefer to not receive
1748                * NFSERR_OLDSTATEID for I/O Ops, but the RFC suggests that that
1749                * is what will happen, so I use the nfsrv_returnoldstateid to
1750                * allow for either server configuration.)
1751                */
1752               if (!error && stp->ls_stateid.seqid!=new_stp->ls_stateid.seqid &&
1753                   (((nd->nd_flag & ND_NFSV41) == 0 &&
1754                    (!(new_stp->ls_flags & NFSLCK_CHECK) ||
1755                     nfsrv_returnoldstateid)) ||
1756                    ((nd->nd_flag & ND_NFSV41) != 0 &&
1757                     new_stp->ls_stateid.seqid != 0)))
1758                     error = NFSERR_OLDSTATEID;
1759             }
1760         }
1761
1762         /*
1763          * Now we can check for grace.
1764          */
1765         if (!error)
1766                 error = nfsrv_checkgrace(nd, clp, new_stp->ls_flags);
1767         if ((new_stp->ls_flags & NFSLCK_RECLAIM) && !error &&
1768                 nfsrv_checkstable(clp))
1769                 error = NFSERR_NOGRACE;
1770         /*
1771          * If we successfully Reclaimed state, note that.
1772          */
1773         if ((new_stp->ls_flags & NFSLCK_RECLAIM) && !error)
1774                 nfsrv_markstable(clp);
1775
1776         /*
1777          * At this point, either error == NFSERR_BADSTATEID or the
1778          * seqid# has been updated, so we can return any error.
1779          * If error == 0, there may be an error in:
1780          *    nd_repstat - Set by the calling function.
1781          *    reterr - Set above, if getting the nfslockfile structure
1782          *       or acquiring the local lock failed.
1783          *    (If both of these are set, nd_repstat should probably be
1784          *     returned, since that error was detected before this
1785          *     function call.)
1786          */
1787         if (error != 0 || nd->nd_repstat != 0 || reterr != 0) {
1788                 if (error == 0) {
1789                         if (nd->nd_repstat != 0)
1790                                 error = nd->nd_repstat;
1791                         else
1792                                 error = reterr;
1793                 }
1794                 if (filestruct_locked != 0) {
1795                         /* Roll back local locks. */
1796                         NFSUNLOCKSTATE();
1797                         if (vnode_unlocked == 0) {
1798                                 ASSERT_VOP_ELOCKED(vp, "nfsrv_lockctrl2");
1799                                 vnode_unlocked = 1;
1800                                 NFSVOPUNLOCK(vp, 0);
1801                         }
1802                         nfsrv_locallock_rollback(vp, lfp, p);
1803                         NFSLOCKSTATE();
1804                         nfsrv_unlocklf(lfp);
1805                 }
1806                 NFSUNLOCKSTATE();
1807                 goto out;
1808         }
1809
1810         /*
1811          * Check the nfsrv_getlockfile return.
1812          * Returned -1 if no structure found.
1813          */
1814         if (getlckret == -1) {
1815                 error = NFSERR_EXPIRED;
1816                 /*
1817                  * Called from lockt, so no lock is OK.
1818                  */
1819                 if (new_stp->ls_flags & NFSLCK_TEST) {
1820                         error = 0;
1821                 } else if (new_stp->ls_flags &
1822                     (NFSLCK_CHECK | NFSLCK_SETATTR)) {
1823                         /*
1824                          * Called to check for a lock, OK if the stateid is all
1825                          * 1s or all 0s, but there should be an nfsstate
1826                          * otherwise.
1827                          * (ie. If there is no open, I'll assume no share
1828                          *  deny bits.)
1829                          */
1830                         if (specialid)
1831                                 error = 0;
1832                         else
1833                                 error = NFSERR_BADSTATEID;
1834                 }
1835                 NFSUNLOCKSTATE();
1836                 goto out;
1837         }
1838
1839         /*
1840          * For NFSLCK_CHECK and NFSLCK_LOCK, test for a share conflict.
1841          * For NFSLCK_CHECK, allow a read if write access is granted,
1842          * but check for a deny. For NFSLCK_LOCK, require correct access,
1843          * which implies a conflicting deny can't exist.
1844          */
1845         if (new_stp->ls_flags & (NFSLCK_CHECK | NFSLCK_LOCK)) {
1846             /*
1847              * Four kinds of state id:
1848              * - specialid (all 0s or all 1s), only for NFSLCK_CHECK
1849              * - stateid for an open
1850              * - stateid for a delegation
1851              * - stateid for a lock owner
1852              */
1853             if (!specialid) {
1854                 if (stp->ls_flags & (NFSLCK_DELEGREAD | NFSLCK_DELEGWRITE)) {
1855                     delegation = 1;
1856                     mystp = stp;
1857                     nfsrv_delaydelegtimeout(stp);
1858                 } else if (stp->ls_flags & NFSLCK_OPEN) {
1859                     mystp = stp;
1860                 } else {
1861                     mystp = stp->ls_openstp;
1862                 }
1863                 /*
1864                  * If locking or checking, require correct access
1865                  * bit set.
1866                  */
1867                 if (((new_stp->ls_flags & NFSLCK_LOCK) &&
1868                      !((new_lop->lo_flags >> NFSLCK_LOCKSHIFT) &
1869                        mystp->ls_flags & NFSLCK_ACCESSBITS)) ||
1870                     ((new_stp->ls_flags & (NFSLCK_CHECK|NFSLCK_READACCESS)) ==
1871                       (NFSLCK_CHECK | NFSLCK_READACCESS) &&
1872                      !(mystp->ls_flags & NFSLCK_READACCESS)) ||
1873                     ((new_stp->ls_flags & (NFSLCK_CHECK|NFSLCK_WRITEACCESS)) ==
1874                       (NFSLCK_CHECK | NFSLCK_WRITEACCESS) &&
1875                      !(mystp->ls_flags & NFSLCK_WRITEACCESS))) {
1876                         if (filestruct_locked != 0) {
1877                                 /* Roll back local locks. */
1878                                 NFSUNLOCKSTATE();
1879                                 if (vnode_unlocked == 0) {
1880                                         ASSERT_VOP_ELOCKED(vp,
1881                                             "nfsrv_lockctrl3");
1882                                         vnode_unlocked = 1;
1883                                         NFSVOPUNLOCK(vp, 0);
1884                                 }
1885                                 nfsrv_locallock_rollback(vp, lfp, p);
1886                                 NFSLOCKSTATE();
1887                                 nfsrv_unlocklf(lfp);
1888                         }
1889                         NFSUNLOCKSTATE();
1890                         error = NFSERR_OPENMODE;
1891                         goto out;
1892                 }
1893             } else
1894                 mystp = NULL;
1895             if ((new_stp->ls_flags & NFSLCK_CHECK) && !delegation) {
1896                 /*
1897                  * Check for a conflicting deny bit.
1898                  */
1899                 LIST_FOREACH(tstp, &lfp->lf_open, ls_file) {
1900                     if (tstp != mystp) {
1901                         bits = tstp->ls_flags;
1902                         bits >>= NFSLCK_SHIFT;
1903                         if (new_stp->ls_flags & bits & NFSLCK_ACCESSBITS) {
1904                             KASSERT(vnode_unlocked == 0,
1905                                 ("nfsrv_lockctrl: vnode unlocked1"));
1906                             ret = nfsrv_clientconflict(tstp->ls_clp, &haslock,
1907                                 vp, p);
1908                             if (ret == 1) {
1909                                 /*
1910                                 * nfsrv_clientconflict unlocks state
1911                                  * when it returns non-zero.
1912                                  */
1913                                 lckstp = NULL;
1914                                 goto tryagain;
1915                             }
1916                             if (ret == 0)
1917                                 NFSUNLOCKSTATE();
1918                             if (ret == 2)
1919                                 error = NFSERR_PERM;
1920                             else
1921                                 error = NFSERR_OPENMODE;
1922                             goto out;
1923                         }
1924                     }
1925                 }
1926
1927                 /* We're outta here */
1928                 NFSUNLOCKSTATE();
1929                 goto out;
1930             }
1931         }
1932
1933         /*
1934          * For setattr, just get rid of all the Delegations for other clients.
1935          */
1936         if (new_stp->ls_flags & NFSLCK_SETATTR) {
1937                 KASSERT(vnode_unlocked == 0,
1938                     ("nfsrv_lockctrl: vnode unlocked2"));
1939                 ret = nfsrv_cleandeleg(vp, lfp, clp, &haslock, p);
1940                 if (ret) {
1941                         /*
1942                          * nfsrv_cleandeleg() unlocks state when it
1943                          * returns non-zero.
1944                          */
1945                         if (ret == -1) {
1946                                 lckstp = NULL;
1947                                 goto tryagain;
1948                         }
1949                         error = ret;
1950                         goto out;
1951                 }
1952                 if (!(new_stp->ls_flags & NFSLCK_CHECK) ||
1953                     (LIST_EMPTY(&lfp->lf_open) && LIST_EMPTY(&lfp->lf_lock) &&
1954                      LIST_EMPTY(&lfp->lf_deleg))) {
1955                         NFSUNLOCKSTATE();
1956                         goto out;
1957                 }
1958         }
1959
1960         /*
1961          * Check for a conflicting delegation. If one is found, call
1962          * nfsrv_delegconflict() to handle it. If the v4root lock hasn't
1963          * been set yet, it will get the lock. Otherwise, it will recall
1964          * the delegation. Then, we try try again...
1965          * I currently believe the conflict algorithm to be:
1966          * For Lock Ops (Lock/LockT/LockU)
1967          * - there is a conflict iff a different client has a write delegation
1968          * For Reading (Read Op)
1969          * - there is a conflict iff a different client has a write delegation
1970          *   (the specialids are always a different client)
1971          * For Writing (Write/Setattr of size)
1972          * - there is a conflict if a different client has any delegation
1973          * - there is a conflict if the same client has a read delegation
1974          *   (I don't understand why this isn't allowed, but that seems to be
1975          *    the current concensus?)
1976          */
1977         tstp = LIST_FIRST(&lfp->lf_deleg);
1978         while (tstp != LIST_END(&lfp->lf_deleg)) {
1979             nstp = LIST_NEXT(tstp, ls_file);
1980             if ((((new_stp->ls_flags&(NFSLCK_LOCK|NFSLCK_UNLOCK|NFSLCK_TEST))||
1981                  ((new_stp->ls_flags & NFSLCK_CHECK) &&
1982                   (new_lop->lo_flags & NFSLCK_READ))) &&
1983                   clp != tstp->ls_clp &&
1984                  (tstp->ls_flags & NFSLCK_DELEGWRITE)) ||
1985                  ((new_stp->ls_flags & NFSLCK_CHECK) &&
1986                    (new_lop->lo_flags & NFSLCK_WRITE) &&
1987                   (clp != tstp->ls_clp ||
1988                    (tstp->ls_flags & NFSLCK_DELEGREAD)))) {
1989                 ret = 0;
1990                 if (filestruct_locked != 0) {
1991                         /* Roll back local locks. */
1992                         NFSUNLOCKSTATE();
1993                         if (vnode_unlocked == 0) {
1994                                 ASSERT_VOP_ELOCKED(vp, "nfsrv_lockctrl4");
1995                                 NFSVOPUNLOCK(vp, 0);
1996                         }
1997                         nfsrv_locallock_rollback(vp, lfp, p);
1998                         NFSLOCKSTATE();
1999                         nfsrv_unlocklf(lfp);
2000                         NFSUNLOCKSTATE();
2001                         NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
2002                         vnode_unlocked = 0;
2003                         if ((vp->v_iflag & VI_DOOMED) != 0)
2004                                 ret = NFSERR_SERVERFAULT;
2005                         NFSLOCKSTATE();
2006                 }
2007                 if (ret == 0)
2008                         ret = nfsrv_delegconflict(tstp, &haslock, p, vp);
2009                 if (ret) {
2010                     /*
2011                      * nfsrv_delegconflict unlocks state when it
2012                      * returns non-zero, which it always does.
2013                      */
2014                     if (other_lop) {
2015                         FREE((caddr_t)other_lop, M_NFSDLOCK);
2016                         other_lop = NULL;
2017                     }
2018                     if (ret == -1) {
2019                         lckstp = NULL;
2020                         goto tryagain;
2021                     }
2022                     error = ret;
2023                     goto out;
2024                 }
2025                 /* Never gets here. */
2026             }
2027             tstp = nstp;
2028         }
2029
2030         /*
2031          * Handle the unlock case by calling nfsrv_updatelock().
2032          * (Should I have done some access checking above for unlock? For now,
2033          *  just let it happen.)
2034          */
2035         if (new_stp->ls_flags & NFSLCK_UNLOCK) {
2036                 first = new_lop->lo_first;
2037                 end = new_lop->lo_end;
2038                 nfsrv_updatelock(stp, new_lopp, &other_lop, lfp);
2039                 stateidp->seqid = ++(stp->ls_stateid.seqid);
2040                 if ((nd->nd_flag & ND_NFSV41) != 0 && stateidp->seqid == 0)
2041                         stateidp->seqid = stp->ls_stateid.seqid = 1;
2042                 stateidp->other[0] = stp->ls_stateid.other[0];
2043                 stateidp->other[1] = stp->ls_stateid.other[1];
2044                 stateidp->other[2] = stp->ls_stateid.other[2];
2045                 if (filestruct_locked != 0) {
2046                         NFSUNLOCKSTATE();
2047                         if (vnode_unlocked == 0) {
2048                                 ASSERT_VOP_ELOCKED(vp, "nfsrv_lockctrl5");
2049                                 vnode_unlocked = 1;
2050                                 NFSVOPUNLOCK(vp, 0);
2051                         }
2052                         /* Update the local locks. */
2053                         nfsrv_localunlock(vp, lfp, first, end, p);
2054                         NFSLOCKSTATE();
2055                         nfsrv_unlocklf(lfp);
2056                 }
2057                 NFSUNLOCKSTATE();
2058                 goto out;
2059         }
2060
2061         /*
2062          * Search for a conflicting lock. A lock conflicts if:
2063          * - the lock range overlaps and
2064          * - at least one lock is a write lock and
2065          * - it is not owned by the same lock owner
2066          */
2067         if (!delegation) {
2068           LIST_FOREACH(lop, &lfp->lf_lock, lo_lckfile) {
2069             if (new_lop->lo_end > lop->lo_first &&
2070                 new_lop->lo_first < lop->lo_end &&
2071                 (new_lop->lo_flags == NFSLCK_WRITE ||
2072                  lop->lo_flags == NFSLCK_WRITE) &&
2073                 lckstp != lop->lo_stp &&
2074                 (clp != lop->lo_stp->ls_clp ||
2075                  lckstp->ls_ownerlen != lop->lo_stp->ls_ownerlen ||
2076                  NFSBCMP(lckstp->ls_owner, lop->lo_stp->ls_owner,
2077                     lckstp->ls_ownerlen))) {
2078                 if (other_lop) {
2079                     FREE((caddr_t)other_lop, M_NFSDLOCK);
2080                     other_lop = NULL;
2081                 }
2082                 if (vnode_unlocked != 0)
2083                     ret = nfsrv_clientconflict(lop->lo_stp->ls_clp, &haslock,
2084                         NULL, p);
2085                 else
2086                     ret = nfsrv_clientconflict(lop->lo_stp->ls_clp, &haslock,
2087                         vp, p);
2088                 if (ret == 1) {
2089                     if (filestruct_locked != 0) {
2090                         if (vnode_unlocked == 0) {
2091                                 ASSERT_VOP_ELOCKED(vp, "nfsrv_lockctrl6");
2092                                 NFSVOPUNLOCK(vp, 0);
2093                         }
2094                         /* Roll back local locks. */
2095                         nfsrv_locallock_rollback(vp, lfp, p);
2096                         NFSLOCKSTATE();
2097                         nfsrv_unlocklf(lfp);
2098                         NFSUNLOCKSTATE();
2099                         NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
2100                         vnode_unlocked = 0;
2101                         if ((vp->v_iflag & VI_DOOMED) != 0) {
2102                                 error = NFSERR_SERVERFAULT;
2103                                 goto out;
2104                         }
2105                     }
2106                     /*
2107                      * nfsrv_clientconflict() unlocks state when it
2108                      * returns non-zero.
2109                      */
2110                     lckstp = NULL;
2111                     goto tryagain;
2112                 }
2113                 /*
2114                  * Found a conflicting lock, so record the conflict and
2115                  * return the error.
2116                  */
2117                 if (cfp != NULL && ret == 0) {
2118                     cfp->cl_clientid.lval[0]=lop->lo_stp->ls_stateid.other[0];
2119                     cfp->cl_clientid.lval[1]=lop->lo_stp->ls_stateid.other[1];
2120                     cfp->cl_first = lop->lo_first;
2121                     cfp->cl_end = lop->lo_end;
2122                     cfp->cl_flags = lop->lo_flags;
2123                     cfp->cl_ownerlen = lop->lo_stp->ls_ownerlen;
2124                     NFSBCOPY(lop->lo_stp->ls_owner, cfp->cl_owner,
2125                         cfp->cl_ownerlen);
2126                 }
2127                 if (ret == 2)
2128                     error = NFSERR_PERM;
2129                 else if (new_stp->ls_flags & NFSLCK_RECLAIM)
2130                     error = NFSERR_RECLAIMCONFLICT;
2131                 else if (new_stp->ls_flags & NFSLCK_CHECK)
2132                     error = NFSERR_LOCKED;
2133                 else
2134                     error = NFSERR_DENIED;
2135                 if (filestruct_locked != 0 && ret == 0) {
2136                         /* Roll back local locks. */
2137                         NFSUNLOCKSTATE();
2138                         if (vnode_unlocked == 0) {
2139                                 ASSERT_VOP_ELOCKED(vp, "nfsrv_lockctrl7");
2140                                 vnode_unlocked = 1;
2141                                 NFSVOPUNLOCK(vp, 0);
2142                         }
2143                         nfsrv_locallock_rollback(vp, lfp, p);
2144                         NFSLOCKSTATE();
2145                         nfsrv_unlocklf(lfp);
2146                 }
2147                 if (ret == 0)
2148                         NFSUNLOCKSTATE();
2149                 goto out;
2150             }
2151           }
2152         }
2153
2154         /*
2155          * We only get here if there was no lock that conflicted.
2156          */
2157         if (new_stp->ls_flags & (NFSLCK_TEST | NFSLCK_CHECK)) {
2158                 NFSUNLOCKSTATE();
2159                 goto out;
2160         }
2161
2162         /*
2163          * We only get here when we are creating or modifying a lock.
2164          * There are two variants:
2165          * - exist_lock_owner where lock_owner exists
2166          * - open_to_lock_owner with new lock_owner
2167          */
2168         first = new_lop->lo_first;
2169         end = new_lop->lo_end;
2170         lock_flags = new_lop->lo_flags;
2171         if (!(new_stp->ls_flags & NFSLCK_OPENTOLOCK)) {
2172                 nfsrv_updatelock(lckstp, new_lopp, &other_lop, lfp);
2173                 stateidp->seqid = ++(lckstp->ls_stateid.seqid);
2174                 if ((nd->nd_flag & ND_NFSV41) != 0 && stateidp->seqid == 0)
2175                         stateidp->seqid = lckstp->ls_stateid.seqid = 1;
2176                 stateidp->other[0] = lckstp->ls_stateid.other[0];
2177                 stateidp->other[1] = lckstp->ls_stateid.other[1];
2178                 stateidp->other[2] = lckstp->ls_stateid.other[2];
2179         } else {
2180                 /*
2181                  * The new open_to_lock_owner case.
2182                  * Link the new nfsstate into the lists.
2183                  */
2184                 new_stp->ls_seq = new_stp->ls_opentolockseq;
2185                 nfsrvd_refcache(new_stp->ls_op);
2186                 stateidp->seqid = new_stp->ls_stateid.seqid = 1;
2187                 stateidp->other[0] = new_stp->ls_stateid.other[0] =
2188                     clp->lc_clientid.lval[0];
2189                 stateidp->other[1] = new_stp->ls_stateid.other[1] =
2190                     clp->lc_clientid.lval[1];
2191                 stateidp->other[2] = new_stp->ls_stateid.other[2] =
2192                     nfsrv_nextstateindex(clp);
2193                 new_stp->ls_clp = clp;
2194                 LIST_INIT(&new_stp->ls_lock);
2195                 new_stp->ls_openstp = stp;
2196                 new_stp->ls_lfp = lfp;
2197                 nfsrv_insertlock(new_lop, (struct nfslock *)new_stp, new_stp,
2198                     lfp);
2199                 LIST_INSERT_HEAD(NFSSTATEHASH(clp, new_stp->ls_stateid),
2200                     new_stp, ls_hash);
2201                 LIST_INSERT_HEAD(&stp->ls_open, new_stp, ls_list);
2202                 *new_lopp = NULL;
2203                 *new_stpp = NULL;
2204                 newnfsstats.srvlockowners++;
2205                 nfsrv_openpluslock++;
2206         }
2207         if (filestruct_locked != 0) {
2208                 NFSUNLOCKSTATE();
2209                 nfsrv_locallock_commit(lfp, lock_flags, first, end);
2210                 NFSLOCKSTATE();
2211                 nfsrv_unlocklf(lfp);
2212         }
2213         NFSUNLOCKSTATE();
2214
2215 out:
2216         if (haslock) {
2217                 NFSLOCKV4ROOTMUTEX();
2218                 nfsv4_unlock(&nfsv4rootfs_lock, 1);
2219                 NFSUNLOCKV4ROOTMUTEX();
2220         }
2221         if (vnode_unlocked != 0) {
2222                 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
2223                 if (error == 0 && (vp->v_iflag & VI_DOOMED) != 0)
2224                         error = NFSERR_SERVERFAULT;
2225         }
2226         if (other_lop)
2227                 FREE((caddr_t)other_lop, M_NFSDLOCK);
2228         NFSEXITCODE2(error, nd);
2229         return (error);
2230 }
2231
2232 /*
2233  * Check for state errors for Open.
2234  * repstat is passed back out as an error if more critical errors
2235  * are not detected.
2236  */
2237 APPLESTATIC int
2238 nfsrv_opencheck(nfsquad_t clientid, nfsv4stateid_t *stateidp,
2239     struct nfsstate *new_stp, vnode_t vp, struct nfsrv_descript *nd,
2240     NFSPROC_T *p, int repstat)
2241 {
2242         struct nfsstate *stp, *nstp;
2243         struct nfsclient *clp;
2244         struct nfsstate *ownerstp;
2245         struct nfslockfile *lfp, *new_lfp;
2246         int error = 0, haslock = 0, ret, readonly = 0, getfhret = 0;
2247
2248         if ((new_stp->ls_flags & NFSLCK_SHAREBITS) == NFSLCK_READACCESS)
2249                 readonly = 1;
2250         /*
2251          * Check for restart conditions (client and server).
2252          */
2253         error = nfsrv_checkrestart(clientid, new_stp->ls_flags,
2254                 &new_stp->ls_stateid, 0);
2255         if (error)
2256                 goto out;
2257
2258         /*
2259          * Check for state resource limit exceeded.
2260          * Technically this should be SMP protected, but the worst
2261          * case error is "out by one or two" on the count when it
2262          * returns NFSERR_RESOURCE and the limit is just a rather
2263          * arbitrary high water mark, so no harm is done.
2264          */
2265         if (nfsrv_openpluslock > nfsrv_v4statelimit) {
2266                 error = NFSERR_RESOURCE;
2267                 goto out;
2268         }
2269
2270 tryagain:
2271         MALLOC(new_lfp, struct nfslockfile *, sizeof (struct nfslockfile),
2272             M_NFSDLOCKFILE, M_WAITOK);
2273         if (vp)
2274                 getfhret = nfsrv_getlockfh(vp, new_stp->ls_flags, new_lfp,
2275                     NULL, p);
2276         NFSLOCKSTATE();
2277         /*
2278          * Get the nfsclient structure.
2279          */
2280         error = nfsrv_getclient(clientid, CLOPS_RENEW, &clp, NULL,
2281             (nfsquad_t)((u_quad_t)0), 0, nd, p);
2282
2283         /*
2284          * Look up the open owner. See if it needs confirmation and
2285          * check the seq#, as required.
2286          */
2287         if (!error)
2288                 nfsrv_getowner(&clp->lc_open, new_stp, &ownerstp);
2289
2290         if (!error && ownerstp) {
2291                 error = nfsrv_checkseqid(nd, new_stp->ls_seq, ownerstp,
2292                     new_stp->ls_op);
2293                 /*
2294                  * If the OpenOwner hasn't been confirmed, assume the
2295                  * old one was a replay and this one is ok.
2296                  * See: RFC3530 Sec. 14.2.18.
2297                  */
2298                 if (error == NFSERR_BADSEQID &&
2299                     (ownerstp->ls_flags & NFSLCK_NEEDSCONFIRM))
2300                         error = 0;
2301         }
2302
2303         /*
2304          * Check for grace.
2305          */
2306         if (!error)
2307                 error = nfsrv_checkgrace(nd, clp, new_stp->ls_flags);
2308         if ((new_stp->ls_flags & NFSLCK_RECLAIM) && !error &&
2309                 nfsrv_checkstable(clp))
2310                 error = NFSERR_NOGRACE;
2311
2312         /*
2313          * If none of the above errors occurred, let repstat be
2314          * returned.
2315          */
2316         if (repstat && !error)
2317                 error = repstat;
2318         if (error) {
2319                 NFSUNLOCKSTATE();
2320                 if (haslock) {
2321                         NFSLOCKV4ROOTMUTEX();
2322                         nfsv4_unlock(&nfsv4rootfs_lock, 1);
2323                         NFSUNLOCKV4ROOTMUTEX();
2324                 }
2325                 free((caddr_t)new_lfp, M_NFSDLOCKFILE);
2326                 goto out;
2327         }
2328
2329         /*
2330          * If vp == NULL, the file doesn't exist yet, so return ok.
2331          * (This always happens on the first pass, so haslock must be 0.)
2332          */
2333         if (vp == NULL) {
2334                 NFSUNLOCKSTATE();
2335                 FREE((caddr_t)new_lfp, M_NFSDLOCKFILE);
2336                 goto out;
2337         }
2338
2339         /*
2340          * Get the structure for the underlying file.
2341          */
2342         if (getfhret)
2343                 error = getfhret;
2344         else
2345                 error = nfsrv_getlockfile(new_stp->ls_flags, &new_lfp, &lfp,
2346                     NULL, 0);
2347         if (new_lfp)
2348                 FREE((caddr_t)new_lfp, M_NFSDLOCKFILE);
2349         if (error) {
2350                 NFSUNLOCKSTATE();
2351                 if (haslock) {
2352                         NFSLOCKV4ROOTMUTEX();
2353                         nfsv4_unlock(&nfsv4rootfs_lock, 1);
2354                         NFSUNLOCKV4ROOTMUTEX();
2355                 }
2356                 goto out;
2357         }
2358
2359         /*
2360          * Search for a conflicting open/share.
2361          */
2362         if (new_stp->ls_flags & NFSLCK_DELEGCUR) {
2363             /*
2364              * For Delegate_Cur, search for the matching Delegation,
2365              * which indicates no conflict.
2366              * An old delegation should have been recovered by the
2367              * client doing a Claim_DELEGATE_Prev, so I won't let
2368              * it match and return NFSERR_EXPIRED. Should I let it
2369              * match?
2370              */
2371             LIST_FOREACH(stp, &lfp->lf_deleg, ls_file) {
2372                 if (!(stp->ls_flags & NFSLCK_OLDDELEG) &&
2373                     (((nd->nd_flag & ND_NFSV41) != 0 &&
2374                     stateidp->seqid == 0) ||
2375                     stateidp->seqid == stp->ls_stateid.seqid) &&
2376                     !NFSBCMP(stateidp->other, stp->ls_stateid.other,
2377                           NFSX_STATEIDOTHER))
2378                         break;
2379             }
2380             if (stp == LIST_END(&lfp->lf_deleg) ||
2381                 ((new_stp->ls_flags & NFSLCK_WRITEACCESS) &&
2382                  (stp->ls_flags & NFSLCK_DELEGREAD))) {
2383                 NFSUNLOCKSTATE();
2384                 if (haslock) {
2385                         NFSLOCKV4ROOTMUTEX();
2386                         nfsv4_unlock(&nfsv4rootfs_lock, 1);
2387                         NFSUNLOCKV4ROOTMUTEX();
2388                 }
2389                 error = NFSERR_EXPIRED;
2390                 goto out;
2391             }
2392         }
2393
2394         /*
2395          * Check for access/deny bit conflicts. I check for the same
2396          * owner as well, in case the client didn't bother.
2397          */
2398         LIST_FOREACH(stp, &lfp->lf_open, ls_file) {
2399                 if (!(new_stp->ls_flags & NFSLCK_DELEGCUR) &&
2400                     (((new_stp->ls_flags & NFSLCK_ACCESSBITS) &
2401                       ((stp->ls_flags>>NFSLCK_SHIFT) & NFSLCK_ACCESSBITS))||
2402                      ((stp->ls_flags & NFSLCK_ACCESSBITS) &
2403                       ((new_stp->ls_flags>>NFSLCK_SHIFT)&NFSLCK_ACCESSBITS)))){
2404                         ret = nfsrv_clientconflict(stp->ls_clp,&haslock,vp,p);
2405                         if (ret == 1) {
2406                                 /*
2407                                  * nfsrv_clientconflict() unlocks
2408                                  * state when it returns non-zero.
2409                                  */
2410                                 goto tryagain;
2411                         }
2412                         if (ret == 2)
2413                                 error = NFSERR_PERM;
2414                         else if (new_stp->ls_flags & NFSLCK_RECLAIM)
2415                                 error = NFSERR_RECLAIMCONFLICT;
2416                         else
2417                                 error = NFSERR_SHAREDENIED;
2418                         if (ret == 0)
2419                                 NFSUNLOCKSTATE();
2420                         if (haslock) {
2421                                 NFSLOCKV4ROOTMUTEX();
2422                                 nfsv4_unlock(&nfsv4rootfs_lock, 1);
2423                                 NFSUNLOCKV4ROOTMUTEX();
2424                         }
2425                         goto out;
2426                 }
2427         }
2428
2429         /*
2430          * Check for a conflicting delegation. If one is found, call
2431          * nfsrv_delegconflict() to handle it. If the v4root lock hasn't
2432          * been set yet, it will get the lock. Otherwise, it will recall
2433          * the delegation. Then, we try try again...
2434          * (If NFSLCK_DELEGCUR is set, it has a delegation, so there
2435          *  isn't a conflict.)
2436          * I currently believe the conflict algorithm to be:
2437          * For Open with Read Access and Deny None
2438          * - there is a conflict iff a different client has a write delegation
2439          * For Open with other Write Access or any Deny except None
2440          * - there is a conflict if a different client has any delegation
2441          * - there is a conflict if the same client has a read delegation
2442          *   (The current concensus is that this last case should be
2443          *    considered a conflict since the client with a read delegation
2444          *    could have done an Open with ReadAccess and WriteDeny
2445          *    locally and then not have checked for the WriteDeny.)
2446          * Don't check for a Reclaim, since that will be dealt with
2447          * by nfsrv_openctrl().
2448          */
2449         if (!(new_stp->ls_flags &
2450                 (NFSLCK_DELEGPREV | NFSLCK_DELEGCUR | NFSLCK_RECLAIM))) {
2451             stp = LIST_FIRST(&lfp->lf_deleg);
2452             while (stp != LIST_END(&lfp->lf_deleg)) {
2453                 nstp = LIST_NEXT(stp, ls_file);
2454                 if ((readonly && stp->ls_clp != clp &&
2455                        (stp->ls_flags & NFSLCK_DELEGWRITE)) ||
2456                     (!readonly && (stp->ls_clp != clp ||
2457                          (stp->ls_flags & NFSLCK_DELEGREAD)))) {
2458                         ret = nfsrv_delegconflict(stp, &haslock, p, vp);
2459                         if (ret) {
2460                             /*
2461                              * nfsrv_delegconflict() unlocks state
2462                              * when it returns non-zero.
2463                              */
2464                             if (ret == -1)
2465                                 goto tryagain;
2466                             error = ret;
2467                             goto out;
2468                         }
2469                 }
2470                 stp = nstp;
2471             }
2472         }
2473         NFSUNLOCKSTATE();
2474         if (haslock) {
2475                 NFSLOCKV4ROOTMUTEX();
2476                 nfsv4_unlock(&nfsv4rootfs_lock, 1);
2477                 NFSUNLOCKV4ROOTMUTEX();
2478         }
2479
2480 out:
2481         NFSEXITCODE2(error, nd);
2482         return (error);
2483 }
2484
2485 /*
2486  * Open control function to create/update open state for an open.
2487  */
2488 APPLESTATIC int
2489 nfsrv_openctrl(struct nfsrv_descript *nd, vnode_t vp,
2490     struct nfsstate **new_stpp, nfsquad_t clientid, nfsv4stateid_t *stateidp,
2491     nfsv4stateid_t *delegstateidp, u_int32_t *rflagsp, struct nfsexstuff *exp,
2492     NFSPROC_T *p, u_quad_t filerev)
2493 {
2494         struct nfsstate *new_stp = *new_stpp;
2495         struct nfsstate *stp, *nstp;
2496         struct nfsstate *openstp = NULL, *new_open, *ownerstp, *new_deleg;
2497         struct nfslockfile *lfp, *new_lfp;
2498         struct nfsclient *clp;
2499         int error = 0, haslock = 0, ret, delegate = 1, writedeleg = 1;
2500         int readonly = 0, cbret = 1, getfhret = 0;
2501
2502         if ((new_stp->ls_flags & NFSLCK_SHAREBITS) == NFSLCK_READACCESS)
2503                 readonly = 1;
2504         /*
2505          * Check for restart conditions (client and server).
2506          * (Paranoia, should have been detected by nfsrv_opencheck().)
2507          * If an error does show up, return NFSERR_EXPIRED, since the
2508          * the seqid# has already been incremented.
2509          */
2510         error = nfsrv_checkrestart(clientid, new_stp->ls_flags,
2511             &new_stp->ls_stateid, 0);
2512         if (error) {
2513                 printf("Nfsd: openctrl unexpected restart err=%d\n",
2514                     error);
2515                 error = NFSERR_EXPIRED;
2516                 goto out;
2517         }
2518
2519 tryagain:
2520         MALLOC(new_lfp, struct nfslockfile *, sizeof (struct nfslockfile),
2521             M_NFSDLOCKFILE, M_WAITOK);
2522         MALLOC(new_open, struct nfsstate *, sizeof (struct nfsstate),
2523             M_NFSDSTATE, M_WAITOK);
2524         MALLOC(new_deleg, struct nfsstate *, sizeof (struct nfsstate),
2525             M_NFSDSTATE, M_WAITOK);
2526         getfhret = nfsrv_getlockfh(vp, new_stp->ls_flags, new_lfp,
2527             NULL, p);
2528         NFSLOCKSTATE();
2529         /*
2530          * Get the client structure. Since the linked lists could be changed
2531          * by other nfsd processes if this process does a tsleep(), one of
2532          * two things must be done.
2533          * 1 - don't tsleep()
2534          * or
2535          * 2 - get the nfsv4_lock() { indicated by haslock == 1 }
2536          *     before using the lists, since this lock stops the other
2537          *     nfsd. This should only be used for rare cases, since it
2538          *     essentially single threads the nfsd.
2539          *     At this time, it is only done for cases where the stable
2540          *     storage file must be written prior to completion of state
2541          *     expiration.
2542          */
2543         error = nfsrv_getclient(clientid, CLOPS_RENEW, &clp, NULL,
2544             (nfsquad_t)((u_quad_t)0), 0, nd, p);
2545         if (!error && (clp->lc_flags & LCL_NEEDSCBNULL) &&
2546             clp->lc_program) {
2547                 /*
2548                  * This happens on the first open for a client
2549                  * that supports callbacks.
2550                  */
2551                 NFSUNLOCKSTATE();
2552                 /*
2553                  * Although nfsrv_docallback() will sleep, clp won't
2554                  * go away, since they are only removed when the
2555                  * nfsv4_lock() has blocked the nfsd threads. The
2556                  * fields in clp can change, but having multiple
2557                  * threads do this Null callback RPC should be
2558                  * harmless.
2559                  */
2560                 cbret = nfsrv_docallback(clp, NFSV4PROC_CBNULL,
2561                     NULL, 0, NULL, NULL, NULL, p);
2562                 NFSLOCKSTATE();
2563                 clp->lc_flags &= ~LCL_NEEDSCBNULL;
2564                 if (!cbret)
2565                         clp->lc_flags |= LCL_CALLBACKSON;
2566         }
2567
2568         /*
2569          * Look up the open owner. See if it needs confirmation and
2570          * check the seq#, as required.
2571          */
2572         if (!error)
2573                 nfsrv_getowner(&clp->lc_open, new_stp, &ownerstp);
2574
2575         if (error) {
2576                 NFSUNLOCKSTATE();
2577                 printf("Nfsd: openctrl unexpected state err=%d\n",
2578                         error);
2579                 free((caddr_t)new_lfp, M_NFSDLOCKFILE);
2580                 free((caddr_t)new_open, M_NFSDSTATE);
2581                 free((caddr_t)new_deleg, M_NFSDSTATE);
2582                 if (haslock) {
2583                         NFSLOCKV4ROOTMUTEX();
2584                         nfsv4_unlock(&nfsv4rootfs_lock, 1);
2585                         NFSUNLOCKV4ROOTMUTEX();
2586                 }
2587                 error = NFSERR_EXPIRED;
2588                 goto out;
2589         }
2590
2591         if (new_stp->ls_flags & NFSLCK_RECLAIM)
2592                 nfsrv_markstable(clp);
2593
2594         /*
2595          * Get the structure for the underlying file.
2596          */
2597         if (getfhret)
2598                 error = getfhret;
2599         else
2600                 error = nfsrv_getlockfile(new_stp->ls_flags, &new_lfp, &lfp,
2601                     NULL, 0);
2602         if (new_lfp)
2603                 FREE((caddr_t)new_lfp, M_NFSDLOCKFILE);
2604         if (error) {
2605                 NFSUNLOCKSTATE();
2606                 printf("Nfsd openctrl unexpected getlockfile err=%d\n",
2607                     error);
2608                 free((caddr_t)new_open, M_NFSDSTATE);
2609                 free((caddr_t)new_deleg, M_NFSDSTATE);
2610                 if (haslock) {
2611                         NFSLOCKV4ROOTMUTEX();
2612                         nfsv4_unlock(&nfsv4rootfs_lock, 1);
2613                         NFSUNLOCKV4ROOTMUTEX();
2614                 }
2615                 goto out;
2616         }
2617
2618         /*
2619          * Search for a conflicting open/share.
2620          */
2621         if (new_stp->ls_flags & NFSLCK_DELEGCUR) {
2622             /*
2623              * For Delegate_Cur, search for the matching Delegation,
2624              * which indicates no conflict.
2625              * An old delegation should have been recovered by the
2626              * client doing a Claim_DELEGATE_Prev, so I won't let
2627              * it match and return NFSERR_EXPIRED. Should I let it
2628              * match?
2629              */
2630             LIST_FOREACH(stp, &lfp->lf_deleg, ls_file) {
2631                 if (!(stp->ls_flags & NFSLCK_OLDDELEG) &&
2632                     (((nd->nd_flag & ND_NFSV41) != 0 &&
2633                     stateidp->seqid == 0) ||
2634                     stateidp->seqid == stp->ls_stateid.seqid) &&
2635                     !NFSBCMP(stateidp->other, stp->ls_stateid.other,
2636                         NFSX_STATEIDOTHER))
2637                         break;
2638             }
2639             if (stp == LIST_END(&lfp->lf_deleg) ||
2640                 ((new_stp->ls_flags & NFSLCK_WRITEACCESS) &&
2641                  (stp->ls_flags & NFSLCK_DELEGREAD))) {
2642                 NFSUNLOCKSTATE();
2643                 printf("Nfsd openctrl unexpected expiry\n");
2644                 free((caddr_t)new_open, M_NFSDSTATE);
2645                 free((caddr_t)new_deleg, M_NFSDSTATE);
2646                 if (haslock) {
2647                         NFSLOCKV4ROOTMUTEX();
2648                         nfsv4_unlock(&nfsv4rootfs_lock, 1);
2649                         NFSUNLOCKV4ROOTMUTEX();
2650                 }
2651                 error = NFSERR_EXPIRED;
2652                 goto out;
2653             }
2654
2655             /*
2656              * Don't issue a Delegation, since one already exists and
2657              * delay delegation timeout, as required.
2658              */
2659             delegate = 0;
2660             nfsrv_delaydelegtimeout(stp);
2661         }
2662
2663         /*
2664          * Check for access/deny bit conflicts. I also check for the
2665          * same owner, since the client might not have bothered to check.
2666          * Also, note an open for the same file and owner, if found,
2667          * which is all we do here for Delegate_Cur, since conflict
2668          * checking is already done.
2669          */
2670         LIST_FOREACH(stp, &lfp->lf_open, ls_file) {
2671                 if (ownerstp && stp->ls_openowner == ownerstp)
2672                         openstp = stp;
2673                 if (!(new_stp->ls_flags & NFSLCK_DELEGCUR)) {
2674                     /*
2675                      * If another client has the file open, the only
2676                      * delegation that can be issued is a Read delegation
2677                      * and only if it is a Read open with Deny none.
2678                      */
2679                     if (clp != stp->ls_clp) {
2680                         if ((stp->ls_flags & NFSLCK_SHAREBITS) ==
2681                             NFSLCK_READACCESS)
2682                             writedeleg = 0;
2683                         else
2684                             delegate = 0;
2685                     }
2686                     if(((new_stp->ls_flags & NFSLCK_ACCESSBITS) &
2687                         ((stp->ls_flags>>NFSLCK_SHIFT) & NFSLCK_ACCESSBITS))||
2688                        ((stp->ls_flags & NFSLCK_ACCESSBITS) &
2689                         ((new_stp->ls_flags>>NFSLCK_SHIFT)&NFSLCK_ACCESSBITS))){
2690                         ret = nfsrv_clientconflict(stp->ls_clp,&haslock,vp,p);
2691                         if (ret == 1) {
2692                                 /*
2693                                  * nfsrv_clientconflict() unlocks state
2694                                  * when it returns non-zero.
2695                                  */
2696                                 free((caddr_t)new_open, M_NFSDSTATE);
2697                                 free((caddr_t)new_deleg, M_NFSDSTATE);
2698                                 openstp = NULL;
2699                                 goto tryagain;
2700                         }
2701                         if (ret == 2)
2702                                 error = NFSERR_PERM;
2703                         else if (new_stp->ls_flags & NFSLCK_RECLAIM)
2704                                 error = NFSERR_RECLAIMCONFLICT;
2705                         else
2706                                 error = NFSERR_SHAREDENIED;
2707                         if (ret == 0)
2708                                 NFSUNLOCKSTATE();
2709                         if (haslock) {
2710                                 NFSLOCKV4ROOTMUTEX();
2711                                 nfsv4_unlock(&nfsv4rootfs_lock, 1);
2712                                 NFSUNLOCKV4ROOTMUTEX();
2713                         }
2714                         free((caddr_t)new_open, M_NFSDSTATE);
2715                         free((caddr_t)new_deleg, M_NFSDSTATE);
2716                         printf("nfsd openctrl unexpected client cnfl\n");
2717                         goto out;
2718                     }
2719                 }
2720         }
2721
2722         /*
2723          * Check for a conflicting delegation. If one is found, call
2724          * nfsrv_delegconflict() to handle it. If the v4root lock hasn't
2725          * been set yet, it will get the lock. Otherwise, it will recall
2726          * the delegation. Then, we try try again...
2727          * (If NFSLCK_DELEGCUR is set, it has a delegation, so there
2728          *  isn't a conflict.)
2729          * I currently believe the conflict algorithm to be:
2730          * For Open with Read Access and Deny None
2731          * - there is a conflict iff a different client has a write delegation
2732          * For Open with other Write Access or any Deny except None
2733          * - there is a conflict if a different client has any delegation
2734          * - there is a conflict if the same client has a read delegation
2735          *   (The current concensus is that this last case should be
2736          *    considered a conflict since the client with a read delegation
2737          *    could have done an Open with ReadAccess and WriteDeny
2738          *    locally and then not have checked for the WriteDeny.)
2739          */
2740         if (!(new_stp->ls_flags & (NFSLCK_DELEGPREV | NFSLCK_DELEGCUR))) {
2741             stp = LIST_FIRST(&lfp->lf_deleg);
2742             while (stp != LIST_END(&lfp->lf_deleg)) {
2743                 nstp = LIST_NEXT(stp, ls_file);
2744                 if (stp->ls_clp != clp && (stp->ls_flags & NFSLCK_DELEGREAD))
2745                         writedeleg = 0;
2746                 else
2747                         delegate = 0;
2748                 if ((readonly && stp->ls_clp != clp &&
2749                        (stp->ls_flags & NFSLCK_DELEGWRITE)) ||
2750                     (!readonly && (stp->ls_clp != clp ||
2751                          (stp->ls_flags & NFSLCK_DELEGREAD)))) {
2752                     if (new_stp->ls_flags & NFSLCK_RECLAIM) {
2753                         delegate = 2;
2754                     } else {
2755                         ret = nfsrv_delegconflict(stp, &haslock, p, vp);
2756                         if (ret) {
2757                             /*
2758                              * nfsrv_delegconflict() unlocks state
2759                              * when it returns non-zero.
2760                              */
2761                             printf("Nfsd openctrl unexpected deleg cnfl\n");
2762                             free((caddr_t)new_open, M_NFSDSTATE);
2763                             free((caddr_t)new_deleg, M_NFSDSTATE);
2764                             if (ret == -1) {
2765                                 openstp = NULL;
2766                                 goto tryagain;
2767                             }
2768                             error = ret;
2769                             goto out;
2770                         }
2771                     }
2772                 }
2773                 stp = nstp;
2774             }
2775         }
2776
2777         /*
2778          * We only get here if there was no open that conflicted.
2779          * If an open for the owner exists, or in the access/deny bits.
2780          * Otherwise it is a new open. If the open_owner hasn't been
2781          * confirmed, replace the open with the new one needing confirmation,
2782          * otherwise add the open.
2783          */
2784         if (new_stp->ls_flags & NFSLCK_DELEGPREV) {
2785             /*
2786              * Handle NFSLCK_DELEGPREV by searching the old delegations for
2787              * a match. If found, just move the old delegation to the current
2788              * delegation list and issue open. If not found, return
2789              * NFSERR_EXPIRED.
2790              */
2791             LIST_FOREACH(stp, &clp->lc_olddeleg, ls_list) {
2792                 if (stp->ls_lfp == lfp) {
2793                     /* Found it */
2794                     if (stp->ls_clp != clp)
2795                         panic("olddeleg clp");
2796                     LIST_REMOVE(stp, ls_list);
2797                     LIST_REMOVE(stp, ls_hash);
2798                     stp->ls_flags &= ~NFSLCK_OLDDELEG;
2799                     stp->ls_stateid.seqid = delegstateidp->seqid = 1;
2800                     stp->ls_stateid.other[0] = delegstateidp->other[0] =
2801                         clp->lc_clientid.lval[0];
2802                     stp->ls_stateid.other[1] = delegstateidp->other[1] =
2803                         clp->lc_clientid.lval[1];
2804                     stp->ls_stateid.other[2] = delegstateidp->other[2] =
2805                         nfsrv_nextstateindex(clp);
2806                     stp->ls_compref = nd->nd_compref;
2807                     LIST_INSERT_HEAD(&clp->lc_deleg, stp, ls_list);
2808                     LIST_INSERT_HEAD(NFSSTATEHASH(clp,
2809                         stp->ls_stateid), stp, ls_hash);
2810                     if (stp->ls_flags & NFSLCK_DELEGWRITE)
2811                         *rflagsp |= NFSV4OPEN_WRITEDELEGATE;
2812                     else
2813                         *rflagsp |= NFSV4OPEN_READDELEGATE;
2814                     clp->lc_delegtime = NFSD_MONOSEC +
2815                         nfsrv_lease + NFSRV_LEASEDELTA;
2816
2817                     /*
2818                      * Now, do the associated open.
2819                      */
2820                     new_open->ls_stateid.seqid = 1;
2821                     new_open->ls_stateid.other[0] = clp->lc_clientid.lval[0];
2822                     new_open->ls_stateid.other[1] = clp->lc_clientid.lval[1];
2823                     new_open->ls_stateid.other[2] = nfsrv_nextstateindex(clp);
2824                     new_open->ls_flags = (new_stp->ls_flags&NFSLCK_DENYBITS)|
2825                         NFSLCK_OPEN;
2826                     if (stp->ls_flags & NFSLCK_DELEGWRITE)
2827                         new_open->ls_flags |= (NFSLCK_READACCESS |
2828                             NFSLCK_WRITEACCESS);
2829                     else
2830                         new_open->ls_flags |= NFSLCK_READACCESS;
2831                     new_open->ls_uid = new_stp->ls_uid;
2832                     new_open->ls_lfp = lfp;
2833                     new_open->ls_clp = clp;
2834                     LIST_INIT(&new_open->ls_open);
2835                     LIST_INSERT_HEAD(&lfp->lf_open, new_open, ls_file);
2836                     LIST_INSERT_HEAD(NFSSTATEHASH(clp, new_open->ls_stateid),
2837                         new_open, ls_hash);
2838                     /*
2839                      * and handle the open owner
2840                      */
2841                     if (ownerstp) {
2842                         new_open->ls_openowner = ownerstp;
2843                         LIST_INSERT_HEAD(&ownerstp->ls_open,new_open,ls_list);
2844                     } else {
2845                         new_open->ls_openowner = new_stp;
2846                         new_stp->ls_flags = 0;
2847                         nfsrvd_refcache(new_stp->ls_op);
2848                         new_stp->ls_noopens = 0;
2849                         LIST_INIT(&new_stp->ls_open);
2850                         LIST_INSERT_HEAD(&new_stp->ls_open, new_open, ls_list);
2851                         LIST_INSERT_HEAD(&clp->lc_open, new_stp, ls_list);
2852                         *new_stpp = NULL;
2853                         newnfsstats.srvopenowners++;
2854                         nfsrv_openpluslock++;
2855                     }
2856                     openstp = new_open;
2857                     new_open = NULL;
2858                     newnfsstats.srvopens++;
2859                     nfsrv_openpluslock++;
2860                     break;
2861                 }
2862             }
2863             if (stp == LIST_END(&clp->lc_olddeleg))
2864                 error = NFSERR_EXPIRED;
2865         } else if (new_stp->ls_flags & (NFSLCK_DELEGREAD | NFSLCK_DELEGWRITE)) {
2866             /*
2867              * Scan to see that no delegation for this client and file
2868              * doesn't already exist.
2869              * There also shouldn't yet be an Open for this file and
2870              * openowner.
2871              */
2872             LIST_FOREACH(stp, &lfp->lf_deleg, ls_file) {
2873                 if (stp->ls_clp == clp)
2874                     break;
2875             }
2876             if (stp == LIST_END(&lfp->lf_deleg) && openstp == NULL) {
2877                 /*
2878                  * This is the Claim_Previous case with a delegation
2879                  * type != Delegate_None.
2880                  */
2881                 /*
2882                  * First, add the delegation. (Although we must issue the
2883                  * delegation, we can also ask for an immediate return.)
2884                  */
2885                 new_deleg->ls_stateid.seqid = delegstateidp->seqid = 1;
2886                 new_deleg->ls_stateid.other[0] = delegstateidp->other[0] =
2887                     clp->lc_clientid.lval[0];
2888                 new_deleg->ls_stateid.other[1] = delegstateidp->other[1] =
2889                     clp->lc_clientid.lval[1];
2890                 new_deleg->ls_stateid.other[2] = delegstateidp->other[2] =
2891                     nfsrv_nextstateindex(clp);
2892                 if (new_stp->ls_flags & NFSLCK_DELEGWRITE) {
2893                     new_deleg->ls_flags = (NFSLCK_DELEGWRITE |
2894                         NFSLCK_READACCESS | NFSLCK_WRITEACCESS);
2895                     *rflagsp |= NFSV4OPEN_WRITEDELEGATE;
2896                 } else {
2897                     new_deleg->ls_flags = (NFSLCK_DELEGREAD |
2898                         NFSLCK_READACCESS);
2899                     *rflagsp |= NFSV4OPEN_READDELEGATE;
2900                 }
2901                 new_deleg->ls_uid = new_stp->ls_uid;
2902                 new_deleg->ls_lfp = lfp;
2903                 new_deleg->ls_clp = clp;
2904                 new_deleg->ls_filerev = filerev;
2905                 new_deleg->ls_compref = nd->nd_compref;
2906                 LIST_INSERT_HEAD(&lfp->lf_deleg, new_deleg, ls_file);
2907                 LIST_INSERT_HEAD(NFSSTATEHASH(clp,
2908                     new_deleg->ls_stateid), new_deleg, ls_hash);
2909                 LIST_INSERT_HEAD(&clp->lc_deleg, new_deleg, ls_list);
2910                 new_deleg = NULL;
2911                 if (delegate == 2 || nfsrv_issuedelegs == 0 ||
2912                     (clp->lc_flags & (LCL_CALLBACKSON | LCL_CBDOWN)) !=
2913                      LCL_CALLBACKSON ||
2914                     NFSRV_V4DELEGLIMIT(nfsrv_delegatecnt) ||
2915                     !NFSVNO_DELEGOK(vp))
2916                     *rflagsp |= NFSV4OPEN_RECALL;
2917                 newnfsstats.srvdelegates++;
2918                 nfsrv_openpluslock++;
2919                 nfsrv_delegatecnt++;
2920
2921                 /*
2922                  * Now, do the associated open.
2923                  */
2924                 new_open->ls_stateid.seqid = 1;
2925                 new_open->ls_stateid.other[0] = clp->lc_clientid.lval[0];
2926                 new_open->ls_stateid.other[1] = clp->lc_clientid.lval[1];
2927                 new_open->ls_stateid.other[2] = nfsrv_nextstateindex(clp);
2928                 new_open->ls_flags = (new_stp->ls_flags & NFSLCK_DENYBITS) |
2929                     NFSLCK_OPEN;
2930                 if (new_stp->ls_flags & NFSLCK_DELEGWRITE)
2931                         new_open->ls_flags |= (NFSLCK_READACCESS |
2932                             NFSLCK_WRITEACCESS);
2933                 else
2934                         new_open->ls_flags |= NFSLCK_READACCESS;
2935                 new_open->ls_uid = new_stp->ls_uid;
2936                 new_open->ls_lfp = lfp;
2937                 new_open->ls_clp = clp;
2938                 LIST_INIT(&new_open->ls_open);
2939                 LIST_INSERT_HEAD(&lfp->lf_open, new_open, ls_file);
2940                 LIST_INSERT_HEAD(NFSSTATEHASH(clp, new_open->ls_stateid),
2941                    new_open, ls_hash);
2942                 /*
2943                  * and handle the open owner
2944                  */
2945                 if (ownerstp) {
2946                     new_open->ls_openowner = ownerstp;
2947                     LIST_INSERT_HEAD(&ownerstp->ls_open, new_open, ls_list);
2948                 } else {
2949                     new_open->ls_openowner = new_stp;
2950                     new_stp->ls_flags = 0;
2951                     nfsrvd_refcache(new_stp->ls_op);
2952                     new_stp->ls_noopens = 0;
2953                     LIST_INIT(&new_stp->ls_open);
2954                     LIST_INSERT_HEAD(&new_stp->ls_open, new_open, ls_list);
2955                     LIST_INSERT_HEAD(&clp->lc_open, new_stp, ls_list);
2956                     *new_stpp = NULL;
2957                     newnfsstats.srvopenowners++;
2958                     nfsrv_openpluslock++;
2959                 }
2960                 openstp = new_open;
2961                 new_open = NULL;
2962                 newnfsstats.srvopens++;
2963                 nfsrv_openpluslock++;
2964             } else {
2965                 error = NFSERR_RECLAIMCONFLICT;
2966             }
2967         } else if (ownerstp) {
2968                 if (ownerstp->ls_flags & NFSLCK_NEEDSCONFIRM) {
2969                     /* Replace the open */
2970                     if (ownerstp->ls_op)
2971                         nfsrvd_derefcache(ownerstp->ls_op);
2972                     ownerstp->ls_op = new_stp->ls_op;
2973                     nfsrvd_refcache(ownerstp->ls_op);
2974                     ownerstp->ls_seq = new_stp->ls_seq;
2975                     *rflagsp |= NFSV4OPEN_RESULTCONFIRM;
2976                     stp = LIST_FIRST(&ownerstp->ls_open);
2977                     stp->ls_flags = (new_stp->ls_flags & NFSLCK_SHAREBITS) |
2978                         NFSLCK_OPEN;
2979                     stp->ls_stateid.seqid = 1;
2980                     stp->ls_uid = new_stp->ls_uid;
2981                     if (lfp != stp->ls_lfp) {
2982                         LIST_REMOVE(stp, ls_file);
2983                         LIST_INSERT_HEAD(&lfp->lf_open, stp, ls_file);
2984                         stp->ls_lfp = lfp;
2985                     }
2986                     openstp = stp;
2987                 } else if (openstp) {
2988                     openstp->ls_flags |= (new_stp->ls_flags & NFSLCK_SHAREBITS);
2989                     openstp->ls_stateid.seqid++;
2990                     if ((nd->nd_flag & ND_NFSV41) != 0 &&
2991                         openstp->ls_stateid.seqid == 0)
2992                         openstp->ls_stateid.seqid = 1;
2993
2994                     /*
2995                      * This is where we can choose to issue a delegation.
2996                      */
2997                     if (delegate == 0 || writedeleg == 0 ||
2998                         NFSVNO_EXRDONLY(exp) || (readonly != 0 &&
2999                         nfsrv_writedelegifpos == 0) ||
3000                         !NFSVNO_DELEGOK(vp) ||
3001                         (new_stp->ls_flags & NFSLCK_WANTRDELEG) != 0 ||
3002                         (clp->lc_flags & (LCL_CALLBACKSON | LCL_CBDOWN)) !=
3003                          LCL_CALLBACKSON)
3004                         *rflagsp |= NFSV4OPEN_WDCONTENTION;
3005                     else if (nfsrv_issuedelegs == 0 ||
3006                         NFSRV_V4DELEGLIMIT(nfsrv_delegatecnt))
3007                         *rflagsp |= NFSV4OPEN_WDRESOURCE;
3008                     else if ((new_stp->ls_flags & NFSLCK_WANTNODELEG) != 0)
3009                         *rflagsp |= NFSV4OPEN_WDNOTWANTED;
3010                     else {
3011                         new_deleg->ls_stateid.seqid = delegstateidp->seqid = 1;
3012                         new_deleg->ls_stateid.other[0] = delegstateidp->other[0]
3013                             = clp->lc_clientid.lval[0];
3014                         new_deleg->ls_stateid.other[1] = delegstateidp->other[1]
3015                             = clp->lc_clientid.lval[1];
3016                         new_deleg->ls_stateid.other[2] = delegstateidp->other[2]
3017                             = nfsrv_nextstateindex(clp);
3018                         new_deleg->ls_flags = (NFSLCK_DELEGWRITE |
3019                             NFSLCK_READACCESS | NFSLCK_WRITEACCESS);
3020                         *rflagsp |= NFSV4OPEN_WRITEDELEGATE;
3021                         new_deleg->ls_uid = new_stp->ls_uid;
3022                         new_deleg->ls_lfp = lfp;
3023                         new_deleg->ls_clp = clp;
3024                         new_deleg->ls_filerev = filerev;
3025                         new_deleg->ls_compref = nd->nd_compref;
3026                         LIST_INSERT_HEAD(&lfp->lf_deleg, new_deleg, ls_file);
3027                         LIST_INSERT_HEAD(NFSSTATEHASH(clp,
3028                             new_deleg->ls_stateid), new_deleg, ls_hash);
3029                         LIST_INSERT_HEAD(&clp->lc_deleg, new_deleg, ls_list);
3030                         new_deleg = NULL;
3031                         newnfsstats.srvdelegates++;
3032                         nfsrv_openpluslock++;
3033                         nfsrv_delegatecnt++;
3034                     }
3035                 } else {
3036                     new_open->ls_stateid.seqid = 1;
3037                     new_open->ls_stateid.other[0] = clp->lc_clientid.lval[0];
3038                     new_open->ls_stateid.other[1] = clp->lc_clientid.lval[1];
3039                     new_open->ls_stateid.other[2] = nfsrv_nextstateindex(clp);
3040                     new_open->ls_flags = (new_stp->ls_flags & NFSLCK_SHAREBITS)|
3041                         NFSLCK_OPEN;
3042                     new_open->ls_uid = new_stp->ls_uid;
3043                     new_open->ls_openowner = ownerstp;
3044                     new_open->ls_lfp = lfp;
3045                     new_open->ls_clp = clp;
3046                     LIST_INIT(&new_open->ls_open);
3047                     LIST_INSERT_HEAD(&lfp->lf_open, new_open, ls_file);
3048                     LIST_INSERT_HEAD(&ownerstp->ls_open, new_open, ls_list);
3049                     LIST_INSERT_HEAD(NFSSTATEHASH(clp, new_open->ls_stateid),
3050                         new_open, ls_hash);
3051                     openstp = new_open;
3052                     new_open = NULL;
3053                     newnfsstats.srvopens++;
3054                     nfsrv_openpluslock++;
3055
3056                     /*
3057                      * This is where we can choose to issue a delegation.
3058                      */
3059                     if (delegate == 0 || (writedeleg == 0 && readonly == 0) ||
3060                         !NFSVNO_DELEGOK(vp) ||
3061                         (clp->lc_flags & (LCL_CALLBACKSON | LCL_CBDOWN)) !=
3062                          LCL_CALLBACKSON)
3063                         *rflagsp |= NFSV4OPEN_WDCONTENTION;
3064                     else if (nfsrv_issuedelegs == 0 ||
3065                         NFSRV_V4DELEGLIMIT(nfsrv_delegatecnt))
3066                         *rflagsp |= NFSV4OPEN_WDRESOURCE;
3067                     else if ((new_stp->ls_flags & NFSLCK_WANTNODELEG) != 0)
3068                         *rflagsp |= NFSV4OPEN_WDNOTWANTED;
3069                     else {
3070                         new_deleg->ls_stateid.seqid = delegstateidp->seqid = 1;
3071                         new_deleg->ls_stateid.other[0] = delegstateidp->other[0]
3072                             = clp->lc_clientid.lval[0];
3073                         new_deleg->ls_stateid.other[1] = delegstateidp->other[1]
3074                             = clp->lc_clientid.lval[1];
3075                         new_deleg->ls_stateid.other[2] = delegstateidp->other[2]
3076                             = nfsrv_nextstateindex(clp);
3077                         if (writedeleg && !NFSVNO_EXRDONLY(exp) &&
3078                             (nfsrv_writedelegifpos || !readonly) &&
3079                             (new_stp->ls_flags & NFSLCK_WANTRDELEG) == 0) {
3080                             new_deleg->ls_flags = (NFSLCK_DELEGWRITE |
3081                                 NFSLCK_READACCESS | NFSLCK_WRITEACCESS);
3082                             *rflagsp |= NFSV4OPEN_WRITEDELEGATE;
3083                         } else {
3084                             new_deleg->ls_flags = (NFSLCK_DELEGREAD |
3085                                 NFSLCK_READACCESS);
3086                             *rflagsp |= NFSV4OPEN_READDELEGATE;
3087                         }
3088                         new_deleg->ls_uid = new_stp->ls_uid;
3089                         new_deleg->ls_lfp = lfp;
3090                         new_deleg->ls_clp = clp;
3091                         new_deleg->ls_filerev = filerev;
3092                         new_deleg->ls_compref = nd->nd_compref;
3093                         LIST_INSERT_HEAD(&lfp->lf_deleg, new_deleg, ls_file);
3094                         LIST_INSERT_HEAD(NFSSTATEHASH(clp,
3095                             new_deleg->ls_stateid), new_deleg, ls_hash);
3096                         LIST_INSERT_HEAD(&clp->lc_deleg, new_deleg, ls_list);
3097                         new_deleg = NULL;
3098                         newnfsstats.srvdelegates++;
3099                         nfsrv_openpluslock++;
3100                         nfsrv_delegatecnt++;
3101                     }
3102                 }
3103         } else {
3104                 /*
3105                  * New owner case. Start the open_owner sequence with a
3106                  * Needs confirmation (unless a reclaim) and hang the
3107                  * new open off it.
3108                  */
3109                 new_open->ls_stateid.seqid = 1;
3110                 new_open->ls_stateid.other[0] = clp->lc_clientid.lval[0];
3111                 new_open->ls_stateid.other[1] = clp->lc_clientid.lval[1];
3112                 new_open->ls_stateid.other[2] = nfsrv_nextstateindex(clp);
3113                 new_open->ls_flags = (new_stp->ls_flags & NFSLCK_SHAREBITS) |
3114                     NFSLCK_OPEN;
3115                 new_open->ls_uid = new_stp->ls_uid;
3116                 LIST_INIT(&new_open->ls_open);
3117                 new_open->ls_openowner = new_stp;
3118                 new_open->ls_lfp = lfp;
3119                 new_open->ls_clp = clp;
3120                 LIST_INSERT_HEAD(&lfp->lf_open, new_open, ls_file);
3121                 if (new_stp->ls_flags & NFSLCK_RECLAIM) {
3122                         new_stp->ls_flags = 0;
3123                 } else if ((nd->nd_flag & ND_NFSV41) != 0) {
3124                         /* NFSv4.1 never needs confirmation. */
3125                         new_stp->ls_flags = 0;
3126
3127                         /*
3128                          * This is where we can choose to issue a delegation.
3129                          */
3130                         if (delegate && nfsrv_issuedelegs &&
3131                             (writedeleg || readonly) &&
3132                             (clp->lc_flags & (LCL_CALLBACKSON | LCL_CBDOWN)) ==
3133                              LCL_CALLBACKSON &&
3134                             !NFSRV_V4DELEGLIMIT(nfsrv_delegatecnt) &&
3135                             NFSVNO_DELEGOK(vp) &&
3136                             ((nd->nd_flag & ND_NFSV41) == 0 ||
3137                              (new_stp->ls_flags & NFSLCK_WANTNODELEG) == 0)) {
3138                                 new_deleg->ls_stateid.seqid =
3139                                     delegstateidp->seqid = 1;
3140                                 new_deleg->ls_stateid.other[0] =
3141                                     delegstateidp->other[0]
3142                                     = clp->lc_clientid.lval[0];
3143                                 new_deleg->ls_stateid.other[1] =
3144                                     delegstateidp->other[1]
3145                                     = clp->lc_clientid.lval[1];
3146                                 new_deleg->ls_stateid.other[2] =
3147                                     delegstateidp->other[2]
3148                                     = nfsrv_nextstateindex(clp);
3149                                 if (writedeleg && !NFSVNO_EXRDONLY(exp) &&
3150                                     (nfsrv_writedelegifpos || !readonly) &&
3151                                     ((nd->nd_flag & ND_NFSV41) == 0 ||
3152                                      (new_stp->ls_flags & NFSLCK_WANTRDELEG) ==
3153                                      0)) {
3154                                         new_deleg->ls_flags =
3155                                             (NFSLCK_DELEGWRITE |
3156                                              NFSLCK_READACCESS |
3157                                              NFSLCK_WRITEACCESS);
3158                                         *rflagsp |= NFSV4OPEN_WRITEDELEGATE;
3159                                 } else {
3160                                         new_deleg->ls_flags =
3161                                             (NFSLCK_DELEGREAD |
3162                                              NFSLCK_READACCESS);
3163                                         *rflagsp |= NFSV4OPEN_READDELEGATE;
3164                                 }
3165                                 new_deleg->ls_uid = new_stp->ls_uid;
3166                                 new_deleg->ls_lfp = lfp;
3167                                 new_deleg->ls_clp = clp;
3168                                 new_deleg->ls_filerev = filerev;
3169                                 new_deleg->ls_compref = nd->nd_compref;
3170                                 LIST_INSERT_HEAD(&lfp->lf_deleg, new_deleg,
3171                                     ls_file);
3172                                 LIST_INSERT_HEAD(NFSSTATEHASH(clp,
3173                                     new_deleg->ls_stateid), new_deleg, ls_hash);
3174                                 LIST_INSERT_HEAD(&clp->lc_deleg, new_deleg,
3175                                     ls_list);
3176                                 new_deleg = NULL;
3177                                 newnfsstats.srvdelegates++;
3178                                 nfsrv_openpluslock++;
3179                                 nfsrv_delegatecnt++;
3180                         }
3181                 } else {
3182                         *rflagsp |= NFSV4OPEN_RESULTCONFIRM;
3183                         new_stp->ls_flags = NFSLCK_NEEDSCONFIRM;
3184                 }
3185                 nfsrvd_refcache(new_stp->ls_op);
3186                 new_stp->ls_noopens = 0;
3187                 LIST_INIT(&new_stp->ls_open);
3188                 LIST_INSERT_HEAD(&new_stp->ls_open, new_open, ls_list);
3189                 LIST_INSERT_HEAD(&clp->lc_open, new_stp, ls_list);
3190                 LIST_INSERT_HEAD(NFSSTATEHASH(clp, new_open->ls_stateid),
3191                     new_open, ls_hash);
3192                 openstp = new_open;
3193                 new_open = NULL;
3194                 *new_stpp = NULL;
3195                 newnfsstats.srvopens++;
3196                 nfsrv_openpluslock++;
3197                 newnfsstats.srvopenowners++;
3198                 nfsrv_openpluslock++;
3199         }
3200         if (!error) {
3201                 stateidp->seqid = openstp->ls_stateid.seqid;
3202                 stateidp->other[0] = openstp->ls_stateid.other[0];
3203                 stateidp->other[1] = openstp->ls_stateid.other[1];
3204                 stateidp->other[2] = openstp->ls_stateid.other[2];
3205         }
3206         NFSUNLOCKSTATE();
3207         if (haslock) {
3208                 NFSLOCKV4ROOTMUTEX();
3209                 nfsv4_unlock(&nfsv4rootfs_lock, 1);
3210                 NFSUNLOCKV4ROOTMUTEX();
3211         }
3212         if (new_open)
3213                 FREE((caddr_t)new_open, M_NFSDSTATE);
3214         if (new_deleg)
3215                 FREE((caddr_t)new_deleg, M_NFSDSTATE);
3216
3217 out:
3218         NFSEXITCODE2(error, nd);
3219         return (error);
3220 }
3221
3222 /*
3223  * Open update. Does the confirm, downgrade and close.
3224  */
3225 APPLESTATIC int
3226 nfsrv_openupdate(vnode_t vp, struct nfsstate *new_stp, nfsquad_t clientid,
3227     nfsv4stateid_t *stateidp, struct nfsrv_descript *nd, NFSPROC_T *p)
3228 {
3229         struct nfsstate *stp, *ownerstp;
3230         struct nfsclient *clp;
3231         struct nfslockfile *lfp;
3232         u_int32_t bits;
3233         int error = 0, gotstate = 0, len = 0;
3234         u_char client[NFSV4_OPAQUELIMIT];
3235
3236         /*
3237          * Check for restart conditions (client and server).
3238          */
3239         error = nfsrv_checkrestart(clientid, new_stp->ls_flags,
3240             &new_stp->ls_stateid, 0);
3241         if (error)
3242                 goto out;
3243
3244         NFSLOCKSTATE();
3245         /*
3246          * Get the open structure via clientid and stateid.
3247          */
3248         error = nfsrv_getclient(clientid, CLOPS_RENEW, &clp, NULL,
3249             (nfsquad_t)((u_quad_t)0), 0, nd, p);
3250         if (!error)
3251                 error = nfsrv_getstate(clp, &new_stp->ls_stateid,
3252                     new_stp->ls_flags, &stp);
3253
3254         /*
3255          * Sanity check the open.
3256          */
3257         if (!error && (!(stp->ls_flags & NFSLCK_OPEN) ||
3258                 (!(new_stp->ls_flags & NFSLCK_CONFIRM) &&
3259                  (stp->ls_openowner->ls_flags & NFSLCK_NEEDSCONFIRM)) ||
3260                 ((new_stp->ls_flags & NFSLCK_CONFIRM) &&
3261                  (!(stp->ls_openowner->ls_flags & NFSLCK_NEEDSCONFIRM)))))
3262                 error = NFSERR_BADSTATEID;
3263
3264         if (!error)
3265                 error = nfsrv_checkseqid(nd, new_stp->ls_seq,
3266                     stp->ls_openowner, new_stp->ls_op);
3267         if (!error && stp->ls_stateid.seqid != new_stp->ls_stateid.seqid &&
3268             (((nd->nd_flag & ND_NFSV41) == 0 &&
3269               !(new_stp->ls_flags & NFSLCK_CONFIRM)) ||
3270              ((nd->nd_flag & ND_NFSV41) != 0 &&
3271               new_stp->ls_stateid.seqid != 0)))
3272                 error = NFSERR_OLDSTATEID;
3273         if (!error && vnode_vtype(vp) != VREG) {
3274                 if (vnode_vtype(vp) == VDIR)
3275                         error = NFSERR_ISDIR;
3276                 else
3277                         error = NFSERR_INVAL;
3278         }
3279
3280         if (error) {
3281                 /*
3282                  * If a client tries to confirm an Open with a bad
3283                  * seqid# and there are no byte range locks or other Opens
3284                  * on the openowner, just throw it away, so the next use of the
3285                  * openowner will start a fresh seq#.
3286                  */
3287                 if (error == NFSERR_BADSEQID &&
3288                     (new_stp->ls_flags & NFSLCK_CONFIRM) &&
3289                     nfsrv_nootherstate(stp))
3290                         nfsrv_freeopenowner(stp->ls_openowner, 0, p);
3291                 NFSUNLOCKSTATE();
3292                 goto out;
3293         }
3294
3295         /*
3296          * Set the return stateid.
3297          */
3298         stateidp->seqid = stp->ls_stateid.seqid + 1;
3299         if ((nd->nd_flag & ND_NFSV41) != 0 && stateidp->seqid == 0)
3300                 stateidp->seqid = 1;
3301         stateidp->other[0] = stp->ls_stateid.other[0];
3302         stateidp->other[1] = stp->ls_stateid.other[1];
3303         stateidp->other[2] = stp->ls_stateid.other[2];
3304         /*
3305          * Now, handle the three cases.
3306          */
3307         if (new_stp->ls_flags & NFSLCK_CONFIRM) {
3308                 /*
3309                  * If the open doesn't need confirmation, it seems to me that
3310                  * there is a client error, but I'll just log it and keep going?
3311                  */
3312                 if (!(stp->ls_openowner->ls_flags & NFSLCK_NEEDSCONFIRM))
3313                         printf("Nfsv4d: stray open confirm\n");
3314                 stp->ls_openowner->ls_flags = 0;
3315                 stp->ls_stateid.seqid++;
3316                 if ((nd->nd_flag & ND_NFSV41) != 0 &&
3317                     stp->ls_stateid.seqid == 0)
3318                         stp->ls_stateid.seqid = 1;
3319                 if (!(clp->lc_flags & LCL_STAMPEDSTABLE)) {
3320                         clp->lc_flags |= LCL_STAMPEDSTABLE;
3321                         len = clp->lc_idlen;
3322                         NFSBCOPY(clp->lc_id, client, len);
3323                         gotstate = 1;
3324                 }
3325                 NFSUNLOCKSTATE();
3326         } else if (new_stp->ls_flags & NFSLCK_CLOSE) {
3327                 ownerstp = stp->ls_openowner;
3328                 lfp = stp->ls_lfp;
3329                 if (nfsrv_dolocallocks != 0 && !LIST_EMPTY(&stp->ls_open)) {
3330                         /* Get the lf lock */
3331                         nfsrv_locklf(lfp);
3332                         NFSUNLOCKSTATE();
3333                         ASSERT_VOP_ELOCKED(vp, "nfsrv_openupdate");
3334                         NFSVOPUNLOCK(vp, 0);
3335                         if (nfsrv_freeopen(stp, vp, 1, p) == 0) {
3336                                 NFSLOCKSTATE();
3337                                 nfsrv_unlocklf(lfp);
3338                                 NFSUNLOCKSTATE();
3339                         }
3340                         NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
3341                 } else {
3342                         (void) nfsrv_freeopen(stp, NULL, 0, p);
3343                         NFSUNLOCKSTATE();
3344                 }
3345         } else {
3346                 /*
3347                  * Update the share bits, making sure that the new set are a
3348                  * subset of the old ones.
3349                  */
3350                 bits = (new_stp->ls_flags & NFSLCK_SHAREBITS);
3351                 if (~(stp->ls_flags) & bits) {
3352                         NFSUNLOCKSTATE();
3353                         error = NFSERR_INVAL;
3354                         goto out;
3355                 }
3356                 stp->ls_flags = (bits | NFSLCK_OPEN);
3357                 stp->ls_stateid.seqid++;
3358                 if ((nd->nd_flag & ND_NFSV41) != 0 &&
3359                     stp->ls_stateid.seqid == 0)
3360                         stp->ls_stateid.seqid = 1;
3361                 NFSUNLOCKSTATE();
3362         }
3363
3364         /*
3365          * If the client just confirmed its first open, write a timestamp
3366          * to the stable storage file.
3367          */
3368         if (gotstate != 0) {
3369                 nfsrv_writestable(client, len, NFSNST_NEWSTATE, p);
3370                 nfsrv_backupstable();
3371         }
3372
3373 out:
3374         NFSEXITCODE2(error, nd);
3375         return (error);
3376 }
3377
3378 /*
3379  * Delegation update. Does the purge and return.
3380  */
3381 APPLESTATIC int
3382 nfsrv_delegupdate(struct nfsrv_descript *nd, nfsquad_t clientid,
3383     nfsv4stateid_t *stateidp, vnode_t vp, int op, struct ucred *cred,
3384     NFSPROC_T *p)
3385 {
3386         struct nfsstate *stp;
3387         struct nfsclient *clp;
3388         int error = 0;
3389         fhandle_t fh;
3390
3391         /*
3392          * Do a sanity check against the file handle for DelegReturn.
3393          */
3394         if (vp) {
3395                 error = nfsvno_getfh(vp, &fh, p);
3396                 if (error)
3397                         goto out;
3398         }
3399         /*
3400          * Check for restart conditions (client and server).
3401          */
3402         if (op == NFSV4OP_DELEGRETURN)
3403                 error = nfsrv_checkrestart(clientid, NFSLCK_DELEGRETURN,
3404                         stateidp, 0);
3405         else
3406                 error = nfsrv_checkrestart(clientid, NFSLCK_DELEGPURGE,
3407                         stateidp, 0);
3408
3409         NFSLOCKSTATE();
3410         /*
3411          * Get the open structure via clientid and stateid.
3412          */
3413         if (!error)
3414             error = nfsrv_getclient(clientid, CLOPS_RENEW, &clp, NULL,
3415                 (nfsquad_t)((u_quad_t)0), 0, nd, p);
3416         if (error) {
3417                 if (error == NFSERR_CBPATHDOWN)
3418                         error = 0;
3419                 if (error == NFSERR_STALECLIENTID && op == NFSV4OP_DELEGRETURN)
3420                         error = NFSERR_STALESTATEID;
3421         }
3422         if (!error && op == NFSV4OP_DELEGRETURN) {
3423             error = nfsrv_getstate(clp, stateidp, NFSLCK_DELEGRETURN, &stp);
3424             if (!error && stp->ls_stateid.seqid != stateidp->seqid &&
3425                 ((nd->nd_flag & ND_NFSV41) == 0 || stateidp->seqid != 0))
3426                 error = NFSERR_OLDSTATEID;
3427         }
3428         /*
3429          * NFSERR_EXPIRED means that the state has gone away,
3430          * so Delegations have been purged. Just return ok.
3431          */
3432         if (error == NFSERR_EXPIRED && op == NFSV4OP_DELEGPURGE) {
3433                 NFSUNLOCKSTATE();
3434                 error = 0;
3435                 goto out;
3436         }
3437         if (error) {
3438                 NFSUNLOCKSTATE();
3439                 goto out;
3440         }
3441
3442         if (op == NFSV4OP_DELEGRETURN) {
3443                 if (NFSBCMP((caddr_t)&fh, (caddr_t)&stp->ls_lfp->lf_fh,
3444                     sizeof (fhandle_t))) {
3445                         NFSUNLOCKSTATE();
3446                         error = NFSERR_BADSTATEID;
3447                         goto out;
3448                 }
3449                 nfsrv_freedeleg(stp);
3450         } else {
3451                 nfsrv_freedeleglist(&clp->lc_olddeleg);
3452         }
3453         NFSUNLOCKSTATE();
3454         error = 0;
3455
3456 out:
3457         NFSEXITCODE(error);
3458         return (error);
3459 }
3460
3461 /*
3462  * Release lock owner.
3463  */
3464 APPLESTATIC int
3465 nfsrv_releaselckown(struct nfsstate *new_stp, nfsquad_t clientid,
3466     NFSPROC_T *p)
3467 {
3468         struct nfsstate *stp, *nstp, *openstp, *ownstp;
3469         struct nfsclient *clp;
3470         int error = 0;
3471
3472         /*
3473          * Check for restart conditions (client and server).
3474          */
3475         error = nfsrv_checkrestart(clientid, new_stp->ls_flags,
3476             &new_stp->ls_stateid, 0);
3477         if (error)
3478                 goto out;
3479
3480         NFSLOCKSTATE();
3481         /*
3482          * Get the lock owner by name.
3483          */
3484         error = nfsrv_getclient(clientid, CLOPS_RENEW, &clp, NULL,
3485             (nfsquad_t)((u_quad_t)0), 0, NULL, p);
3486         if (error) {
3487                 NFSUNLOCKSTATE();
3488                 goto out;
3489         }
3490         LIST_FOREACH(ownstp, &clp->lc_open, ls_list) {
3491             LIST_FOREACH(openstp, &ownstp->ls_open, ls_list) {
3492                 stp = LIST_FIRST(&openstp->ls_open);
3493                 while (stp != LIST_END(&openstp->ls_open)) {
3494                     nstp = LIST_NEXT(stp, ls_list);
3495                     /*
3496                      * If the owner matches, check for locks and
3497                      * then free or return an error.
3498                      */
3499                     if (stp->ls_ownerlen == new_stp->ls_ownerlen &&
3500                         !NFSBCMP(stp->ls_owner, new_stp->ls_owner,
3501                          stp->ls_ownerlen)){
3502                         if (LIST_EMPTY(&stp->ls_lock)) {
3503                             nfsrv_freelockowner(stp, NULL, 0, p);
3504                         } else {
3505                             NFSUNLOCKSTATE();
3506                             error = NFSERR_LOCKSHELD;
3507                             goto out;
3508                         }
3509                     }
3510                     stp = nstp;
3511                 }
3512             }
3513         }
3514         NFSUNLOCKSTATE();
3515
3516 out:
3517         NFSEXITCODE(error);
3518         return (error);
3519 }
3520
3521 /*
3522  * Get the file handle for a lock structure.
3523  */
3524 static int
3525 nfsrv_getlockfh(vnode_t vp, u_short flags, struct nfslockfile *new_lfp,
3526     fhandle_t *nfhp, NFSPROC_T *p)
3527 {
3528         fhandle_t *fhp = NULL;
3529         int error;
3530
3531         /*
3532          * For lock, use the new nfslock structure, otherwise just
3533          * a fhandle_t on the stack.
3534          */
3535         if (flags & NFSLCK_OPEN) {
3536                 KASSERT(new_lfp != NULL, ("nfsrv_getlockfh: new_lfp NULL"));
3537                 fhp = &new_lfp->lf_fh;
3538         } else if (nfhp) {
3539                 fhp = nfhp;
3540         } else {
3541                 panic("nfsrv_getlockfh");
3542         }
3543         error = nfsvno_getfh(vp, fhp, p);
3544         NFSEXITCODE(error);
3545         return (error);
3546 }
3547
3548 /*
3549  * Get an nfs lock structure. Allocate one, as required, and return a
3550  * pointer to it.
3551  * Returns an NFSERR_xxx upon failure or -1 to indicate no current lock.
3552  */
3553 static int
3554 nfsrv_getlockfile(u_short flags, struct nfslockfile **new_lfpp,
3555     struct nfslockfile **lfpp, fhandle_t *nfhp, int lockit)
3556 {
3557         struct nfslockfile *lfp;
3558         fhandle_t *fhp = NULL, *tfhp;
3559         struct nfslockhashhead *hp;
3560         struct nfslockfile *new_lfp = NULL;
3561
3562         /*
3563          * For lock, use the new nfslock structure, otherwise just
3564          * a fhandle_t on the stack.
3565          */
3566         if (flags & NFSLCK_OPEN) {
3567                 new_lfp = *new_lfpp;
3568                 fhp = &new_lfp->lf_fh;
3569         } else if (nfhp) {
3570                 fhp = nfhp;
3571         } else {
3572                 panic("nfsrv_getlockfile");
3573         }
3574
3575         hp = NFSLOCKHASH(fhp);
3576         LIST_FOREACH(lfp, hp, lf_hash) {
3577                 tfhp = &lfp->lf_fh;
3578                 if (NFSVNO_CMPFH(fhp, tfhp)) {
3579                         if (lockit)
3580                                 nfsrv_locklf(lfp);
3581                         *lfpp = lfp;
3582                         return (0);
3583                 }
3584         }
3585         if (!(flags & NFSLCK_OPEN))
3586                 return (-1);
3587
3588         /*
3589          * No match, so chain the new one into the list.
3590          */
3591         LIST_INIT(&new_lfp->lf_open);
3592         LIST_INIT(&new_lfp->lf_lock);
3593         LIST_INIT(&new_lfp->lf_deleg);
3594         LIST_INIT(&new_lfp->lf_locallock);
3595         LIST_INIT(&new_lfp->lf_rollback);
3596         new_lfp->lf_locallock_lck.nfslock_usecnt = 0;
3597         new_lfp->lf_locallock_lck.nfslock_lock = 0;
3598         new_lfp->lf_usecount = 0;
3599         LIST_INSERT_HEAD(hp, new_lfp, lf_hash);
3600         *lfpp = new_lfp;
3601         *new_lfpp = NULL;
3602         return (0);
3603 }
3604
3605 /*
3606  * This function adds a nfslock lock structure to the list for the associated
3607  * nfsstate and nfslockfile structures. It will be inserted after the
3608  * entry pointed at by insert_lop.
3609  */
3610 static void
3611 nfsrv_insertlock(struct nfslock *new_lop, struct nfslock *insert_lop,
3612     struct nfsstate *stp, struct nfslockfile *lfp)
3613 {
3614         struct nfslock *lop, *nlop;
3615
3616         new_lop->lo_stp = stp;
3617         new_lop->lo_lfp = lfp;
3618
3619         if (stp != NULL) {
3620                 /* Insert in increasing lo_first order */
3621                 lop = LIST_FIRST(&lfp->lf_lock);
3622                 if (lop == LIST_END(&lfp->lf_lock) ||
3623                     new_lop->lo_first <= lop->lo_first) {
3624                         LIST_INSERT_HEAD(&lfp->lf_lock, new_lop, lo_lckfile);
3625                 } else {
3626                         nlop = LIST_NEXT(lop, lo_lckfile);
3627                         while (nlop != LIST_END(&lfp->lf_lock) &&
3628                                nlop->lo_first < new_lop->lo_first) {
3629                                 lop = nlop;
3630                                 nlop = LIST_NEXT(lop, lo_lckfile);
3631                         }
3632                         LIST_INSERT_AFTER(lop, new_lop, lo_lckfile);
3633                 }
3634         } else {
3635                 new_lop->lo_lckfile.le_prev = NULL;     /* list not used */
3636         }
3637
3638         /*
3639          * Insert after insert_lop, which is overloaded as stp or lfp for
3640          * an empty list.
3641          */
3642         if (stp == NULL && (struct nfslockfile *)insert_lop == lfp)
3643                 LIST_INSERT_HEAD(&lfp->lf_locallock, new_lop, lo_lckowner);
3644         else if ((struct nfsstate *)insert_lop == stp)
3645                 LIST_INSERT_HEAD(&stp->ls_lock, new_lop, lo_lckowner);
3646         else
3647                 LIST_INSERT_AFTER(insert_lop, new_lop, lo_lckowner);
3648         if (stp != NULL) {
3649                 newnfsstats.srvlocks++;
3650                 nfsrv_openpluslock++;
3651         }
3652 }
3653
3654 /*
3655  * This function updates the locking for a lock owner and given file. It
3656  * maintains a list of lock ranges ordered on increasing file offset that
3657  * are NFSLCK_READ or NFSLCK_WRITE and non-overlapping (aka POSIX style).
3658  * It always adds new_lop to the list and sometimes uses the one pointed
3659  * at by other_lopp.
3660  */
3661 static void
3662 nfsrv_updatelock(struct nfsstate *stp, struct nfslock **new_lopp,
3663     struct nfslock **other_lopp, struct nfslockfile *lfp)
3664 {
3665         struct nfslock *new_lop = *new_lopp;
3666         struct nfslock *lop, *tlop, *ilop;
3667         struct nfslock *other_lop = *other_lopp;
3668         int unlock = 0, myfile = 0;
3669         u_int64_t tmp;
3670
3671         /*
3672          * Work down the list until the lock is merged.
3673          */
3674         if (new_lop->lo_flags & NFSLCK_UNLOCK)
3675                 unlock = 1;
3676         if (stp != NULL) {
3677                 ilop = (struct nfslock *)stp;
3678                 lop = LIST_FIRST(&stp->ls_lock);
3679         } else {
3680                 ilop = (struct nfslock *)lfp;
3681                 lop = LIST_FIRST(&lfp->lf_locallock);
3682         }
3683         while (lop != NULL) {
3684             /*
3685              * Only check locks for this file that aren't before the start of
3686              * new lock's range.
3687              */
3688             if (lop->lo_lfp == lfp) {
3689               myfile = 1;
3690               if (lop->lo_end >= new_lop->lo_first) {
3691                 if (new_lop->lo_end < lop->lo_first) {
3692                         /*
3693                          * If the new lock ends before the start of the
3694                          * current lock's range, no merge, just insert
3695                          * the new lock.
3696                          */
3697                         break;
3698                 }
3699                 if (new_lop->lo_flags == lop->lo_flags ||
3700                     (new_lop->lo_first <= lop->lo_first &&
3701                      new_lop->lo_end >= lop->lo_end)) {
3702                         /*
3703                          * This lock can be absorbed by the new lock/unlock.
3704                          * This happens when it covers the entire range
3705                          * of the old lock or is contiguous
3706                          * with the old lock and is of the same type or an
3707                          * unlock.
3708                          */
3709                         if (lop->lo_first < new_lop->lo_first)
3710                                 new_lop->lo_first = lop->lo_first;
3711                         if (lop->lo_end > new_lop->lo_end)
3712                                 new_lop->lo_end = lop->lo_end;
3713                         tlop = lop;
3714                         lop = LIST_NEXT(lop, lo_lckowner);
3715                         nfsrv_freenfslock(tlop);
3716                         continue;
3717                 }
3718
3719                 /*
3720                  * All these cases are for contiguous locks that are not the
3721                  * same type, so they can't be merged.
3722                  */
3723                 if (new_lop->lo_first <= lop->lo_first) {
3724                         /*
3725                          * This case is where the new lock overlaps with the
3726                          * first part of the old lock. Move the start of the
3727                          * old lock to just past the end of the new lock. The
3728                          * new lock will be inserted in front of the old, since
3729                          * ilop hasn't been updated. (We are done now.)
3730                          */
3731                         lop->lo_first = new_lop->lo_end;
3732                         break;
3733                 }
3734                 if (new_lop->lo_end >= lop->lo_end) {
3735                         /*
3736                          * This case is where the new lock overlaps with the
3737                          * end of the old lock's range. Move the old lock's
3738                          * end to just before the new lock's first and insert
3739                          * the new lock after the old lock.
3740                          * Might not be done yet, since the new lock could
3741                          * overlap further locks with higher ranges.
3742                          */
3743                         lop->lo_end = new_lop->lo_first;
3744                         ilop = lop;
3745                         lop = LIST_NEXT(lop, lo_lckowner);
3746                         continue;
3747                 }
3748                 /*
3749                  * The final case is where the new lock's range is in the
3750                  * middle of the current lock's and splits the current lock
3751                  * up. Use *other_lopp to handle the second part of the
3752                  * split old lock range. (We are done now.)
3753                  * For unlock, we use new_lop as other_lop and tmp, since
3754                  * other_lop and new_lop are the same for this case.
3755                  * We noted the unlock case above, so we don't need
3756                  * new_lop->lo_flags any longer.
3757                  */
3758                 tmp = new_lop->lo_first;
3759                 if (other_lop == NULL) {
3760                         if (!unlock)
3761                                 panic("nfsd srv update unlock");
3762                         other_lop = new_lop;
3763                         *new_lopp = NULL;
3764                 }
3765                 other_lop->lo_first = new_lop->lo_end;
3766                 other_lop->lo_end = lop->lo_end;
3767                 other_lop->lo_flags = lop->lo_flags;
3768                 other_lop->lo_stp = stp;
3769                 other_lop->lo_lfp = lfp;
3770                 lop->lo_end = tmp;
3771                 nfsrv_insertlock(other_lop, lop, stp, lfp);
3772                 *other_lopp = NULL;
3773                 ilop = lop;
3774                 break;
3775               }
3776             }
3777             ilop = lop;
3778             lop = LIST_NEXT(lop, lo_lckowner);
3779             if (myfile && (lop == NULL || lop->lo_lfp != lfp))
3780                 break;
3781         }
3782
3783         /*
3784          * Insert the new lock in the list at the appropriate place.
3785          */
3786         if (!unlock) {
3787                 nfsrv_insertlock(new_lop, ilop, stp, lfp);
3788                 *new_lopp = NULL;
3789         }
3790 }
3791
3792 /*
3793  * This function handles sequencing of locks, etc.
3794  * It returns an error that indicates what the caller should do.
3795  */
3796 static int
3797 nfsrv_checkseqid(struct nfsrv_descript *nd, u_int32_t seqid,
3798     struct nfsstate *stp, struct nfsrvcache *op)
3799 {
3800         int error = 0;
3801
3802         if ((nd->nd_flag & ND_NFSV41) != 0)
3803                 /* NFSv4.1 ignores the open_seqid and lock_seqid. */
3804                 goto out;
3805         if (op != nd->nd_rp)
3806                 panic("nfsrvstate checkseqid");
3807         if (!(op->rc_flag & RC_INPROG))
3808                 panic("nfsrvstate not inprog");
3809         if (stp->ls_op && stp->ls_op->rc_refcnt <= 0) {
3810                 printf("refcnt=%d\n", stp->ls_op->rc_refcnt);
3811                 panic("nfsrvstate op refcnt");
3812         }
3813         if ((stp->ls_seq + 1) == seqid) {
3814                 if (stp->ls_op)
3815                         nfsrvd_derefcache(stp->ls_op);
3816                 stp->ls_op = op;
3817                 nfsrvd_refcache(op);
3818                 stp->ls_seq = seqid;
3819                 goto out;
3820         } else if (stp->ls_seq == seqid && stp->ls_op &&
3821                 op->rc_xid == stp->ls_op->rc_xid &&
3822                 op->rc_refcnt == 0 &&
3823                 op->rc_reqlen == stp->ls_op->rc_reqlen &&
3824                 op->rc_cksum == stp->ls_op->rc_cksum) {
3825                 if (stp->ls_op->rc_flag & RC_INPROG) {
3826                         error = NFSERR_DONTREPLY;
3827                         goto out;
3828                 }
3829                 nd->nd_rp = stp->ls_op;
3830                 nd->nd_rp->rc_flag |= RC_INPROG;
3831                 nfsrvd_delcache(op);
3832                 error = NFSERR_REPLYFROMCACHE;
3833                 goto out;
3834         }
3835         error = NFSERR_BADSEQID;
3836
3837 out:
3838         NFSEXITCODE2(error, nd);
3839         return (error);
3840 }
3841
3842 /*
3843  * Get the client ip address for callbacks. If the strings can't be parsed,
3844  * just set lc_program to 0 to indicate no callbacks are possible.
3845  * (For cases where the address can't be parsed or is 0.0.0.0.0.0, set
3846  *  the address to the client's transport address. This won't be used
3847  *  for callbacks, but can be printed out by newnfsstats for info.)
3848  * Return error if the xdr can't be parsed, 0 otherwise.
3849  */
3850 APPLESTATIC int
3851 nfsrv_getclientipaddr(struct nfsrv_descript *nd, struct nfsclient *clp)
3852 {
3853         u_int32_t *tl;
3854         u_char *cp, *cp2;
3855         int i, j;
3856         struct sockaddr_in *rad, *sad;
3857         u_char protocol[5], addr[24];
3858         int error = 0, cantparse = 0;
3859         union {
3860                 u_long ival;
3861                 u_char cval[4];
3862         } ip;
3863         union {
3864                 u_short sval;
3865                 u_char cval[2];
3866         } port;
3867
3868         rad = NFSSOCKADDR(clp->lc_req.nr_nam, struct sockaddr_in *);
3869         rad->sin_family = AF_INET;
3870         rad->sin_len = sizeof (struct sockaddr_in);
3871         rad->sin_addr.s_addr = 0;
3872         rad->sin_port = 0;
3873         clp->lc_req.nr_client = NULL;
3874         clp->lc_req.nr_lock = 0;
3875         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
3876         i = fxdr_unsigned(int, *tl);
3877         if (i >= 3 && i <= 4) {
3878                 error = nfsrv_mtostr(nd, protocol, i);
3879                 if (error)
3880                         goto nfsmout;
3881                 if (!strcmp(protocol, "tcp")) {
3882                         clp->lc_flags |= LCL_TCPCALLBACK;
3883                         clp->lc_req.nr_sotype = SOCK_STREAM;
3884                         clp->lc_req.nr_soproto = IPPROTO_TCP;
3885                 } else if (!strcmp(protocol, "udp")) {
3886                         clp->lc_req.nr_sotype = SOCK_DGRAM;
3887                         clp->lc_req.nr_soproto = IPPROTO_UDP;
3888                 } else {
3889                         cantparse = 1;
3890                 }
3891         } else {
3892                 cantparse = 1;
3893                 if (i > 0) {
3894                         error = nfsm_advance(nd, NFSM_RNDUP(i), -1);
3895                         if (error)
3896                                 goto nfsmout;
3897                 }
3898         }
3899         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
3900         i = fxdr_unsigned(int, *tl);
3901         if (i < 0) {
3902                 error = NFSERR_BADXDR;
3903                 goto nfsmout;
3904         } else if (i == 0) {
3905                 cantparse = 1;
3906         } else if (!cantparse && i <= 23 && i >= 11) {
3907                 error = nfsrv_mtostr(nd, addr, i);
3908                 if (error)
3909                         goto nfsmout;
3910
3911                 /*
3912                  * Parse out the address fields. We expect 6 decimal numbers
3913                  * separated by '.'s.
3914                  */
3915                 cp = addr;
3916                 i = 0;
3917                 while (*cp && i < 6) {
3918                         cp2 = cp;
3919                         while (*cp2 && *cp2 != '.')
3920                                 cp2++;
3921                         if (*cp2)
3922                                 *cp2++ = '\0';
3923                         else if (i != 5) {
3924                                 cantparse = 1;
3925                                 break;
3926                         }
3927                         j = nfsrv_getipnumber(cp);
3928                         if (j >= 0) {
3929                                 if (i < 4)
3930                                         ip.cval[3 - i] = j;
3931                                 else
3932                                         port.cval[5 - i] = j;
3933                         } else {
3934                                 cantparse = 1;
3935                                 break;
3936                         }
3937                         cp = cp2;
3938                         i++;
3939                 }
3940                 if (!cantparse) {
3941                         if (ip.ival != 0x0) {
3942                                 rad->sin_addr.s_addr = htonl(ip.ival);
3943                                 rad->sin_port = htons(port.sval);
3944                         } else {
3945                                 cantparse = 1;
3946                         }
3947                 }
3948         } else {
3949                 cantparse = 1;
3950                 if (i > 0) {
3951                         error = nfsm_advance(nd, NFSM_RNDUP(i), -1);
3952                         if (error)
3953                                 goto nfsmout;
3954                 }
3955         }
3956         if (cantparse) {
3957                 sad = NFSSOCKADDR(nd->nd_nam, struct sockaddr_in *);
3958                 rad->sin_addr.s_addr = sad->sin_addr.s_addr;
3959                 rad->sin_port = 0x0;
3960                 clp->lc_program = 0;
3961         }
3962 nfsmout:
3963         NFSEXITCODE2(error, nd);
3964         return (error);
3965 }
3966
3967 /*
3968  * Turn a string of up to three decimal digits into a number. Return -1 upon
3969  * error.
3970  */
3971 static int
3972 nfsrv_getipnumber(u_char *cp)
3973 {
3974         int i = 0, j = 0;
3975
3976         while (*cp) {
3977                 if (j > 2 || *cp < '0' || *cp > '9')
3978                         return (-1);
3979                 i *= 10;
3980                 i += (*cp - '0');
3981                 cp++;
3982                 j++;
3983         }
3984         if (i < 256)
3985                 return (i);
3986         return (-1);
3987 }
3988
3989 /*
3990  * This function checks for restart conditions.
3991  */
3992 static int
3993 nfsrv_checkrestart(nfsquad_t clientid, u_int32_t flags,
3994     nfsv4stateid_t *stateidp, int specialid)
3995 {
3996         int ret = 0;
3997
3998         /*
3999          * First check for a server restart. Open, LockT, ReleaseLockOwner
4000          * and DelegPurge have a clientid, the rest a stateid.
4001          */
4002         if (flags &
4003             (NFSLCK_OPEN | NFSLCK_TEST | NFSLCK_RELEASE | NFSLCK_DELEGPURGE)) {
4004                 if (clientid.lval[0] != nfsrvboottime) {
4005                         ret = NFSERR_STALECLIENTID;
4006                         goto out;
4007                 }
4008         } else if (stateidp->other[0] != nfsrvboottime &&
4009                 specialid == 0) {
4010                 ret = NFSERR_STALESTATEID;
4011                 goto out;
4012         }
4013
4014         /*
4015          * Read, Write, Setattr and LockT can return NFSERR_GRACE and do
4016          * not use a lock/open owner seqid#, so the check can be done now.
4017          * (The others will be checked, as required, later.)
4018          */
4019         if (!(flags & (NFSLCK_CHECK | NFSLCK_TEST)))
4020                 goto out;
4021
4022         NFSLOCKSTATE();
4023         ret = nfsrv_checkgrace(NULL, NULL, flags);
4024         NFSUNLOCKSTATE();
4025
4026 out:
4027         NFSEXITCODE(ret);
4028         return (ret);
4029 }
4030
4031 /*
4032  * Check for grace.
4033  */
4034 static int
4035 nfsrv_checkgrace(struct nfsrv_descript *nd, struct nfsclient *clp,
4036     u_int32_t flags)
4037 {
4038         int error = 0;
4039
4040         if ((nfsrv_stablefirst.nsf_flags & NFSNSF_GRACEOVER) != 0) {
4041                 if (flags & NFSLCK_RECLAIM) {
4042                         error = NFSERR_NOGRACE;
4043                         goto out;
4044                 }
4045         } else {
4046                 if (!(flags & NFSLCK_RECLAIM)) {
4047                         error = NFSERR_GRACE;
4048                         goto out;
4049                 }
4050                 if (nd != NULL && clp != NULL &&
4051                     (nd->nd_flag & ND_NFSV41) != 0 &&
4052                     (clp->lc_flags & LCL_RECLAIMCOMPLETE) != 0) {
4053                         error = NFSERR_NOGRACE;
4054                         goto out;
4055                 }
4056
4057                 /*
4058                  * If grace is almost over and we are still getting Reclaims,
4059                  * extend grace a bit.
4060                  */
4061                 if ((NFSD_MONOSEC + NFSRV_LEASEDELTA) >
4062                     nfsrv_stablefirst.nsf_eograce)
4063                         nfsrv_stablefirst.nsf_eograce = NFSD_MONOSEC +
4064                                 NFSRV_LEASEDELTA;
4065         }
4066
4067 out:
4068         NFSEXITCODE(error);
4069         return (error);
4070 }
4071
4072 /*
4073  * Do a server callback.
4074  */
4075 static int
4076 nfsrv_docallback(struct nfsclient *clp, int procnum,
4077     nfsv4stateid_t *stateidp, int trunc, fhandle_t *fhp,
4078     struct nfsvattr *nap, nfsattrbit_t *attrbitp, NFSPROC_T *p)
4079 {
4080         mbuf_t m;
4081         u_int32_t *tl;
4082         struct nfsrv_descript nfsd, *nd = &nfsd;
4083         struct ucred *cred;
4084         int error = 0;
4085         u_int32_t callback;
4086         struct nfsdsession *sep = NULL;
4087
4088         cred = newnfs_getcred();
4089         NFSLOCKSTATE(); /* mostly for lc_cbref++ */
4090         if (clp->lc_flags & LCL_NEEDSCONFIRM) {
4091                 NFSUNLOCKSTATE();
4092                 panic("docallb");
4093         }
4094         clp->lc_cbref++;
4095
4096         /*
4097          * Fill the callback program# and version into the request
4098          * structure for newnfs_connect() to use.
4099          */
4100         clp->lc_req.nr_prog = clp->lc_program;
4101 #ifdef notnow
4102         if ((clp->lc_flags & LCL_NFSV41) != 0)
4103                 clp->lc_req.nr_vers = NFSV41_CBVERS;
4104         else
4105 #endif
4106                 clp->lc_req.nr_vers = NFSV4_CBVERS;
4107
4108         /*
4109          * First, fill in some of the fields of nd and cr.
4110          */
4111         nd->nd_flag = ND_NFSV4;
4112         if (clp->lc_flags & LCL_GSS)
4113                 nd->nd_flag |= ND_KERBV;
4114         if ((clp->lc_flags & LCL_NFSV41) != 0)
4115                 nd->nd_flag |= ND_NFSV41;
4116         nd->nd_repstat = 0;
4117         cred->cr_uid = clp->lc_uid;
4118         cred->cr_gid = clp->lc_gid;
4119         callback = clp->lc_callback;
4120         NFSUNLOCKSTATE();
4121         cred->cr_ngroups = 1;
4122
4123         /*
4124          * Get the first mbuf for the request.
4125          */
4126         MGET(m, M_WAITOK, MT_DATA);
4127         mbuf_setlen(m, 0);
4128         nd->nd_mreq = nd->nd_mb = m;
4129         nd->nd_bpos = NFSMTOD(m, caddr_t);
4130         
4131         /*
4132          * and build the callback request.
4133          */
4134         if (procnum == NFSV4OP_CBGETATTR) {
4135                 nd->nd_procnum = NFSV4PROC_CBCOMPOUND;
4136                 error = nfsrv_cbcallargs(nd, clp, callback, NFSV4OP_CBGETATTR,
4137                     "CB Getattr", &sep);
4138                 if (error != 0) {
4139                         mbuf_freem(nd->nd_mreq);
4140                         goto errout;
4141                 }
4142                 (void)nfsm_fhtom(nd, (u_int8_t *)fhp, NFSX_MYFH, 0);
4143                 (void)nfsrv_putattrbit(nd, attrbitp);
4144         } else if (procnum == NFSV4OP_CBRECALL) {
4145                 nd->nd_procnum = NFSV4PROC_CBCOMPOUND;
4146                 error = nfsrv_cbcallargs(nd, clp, callback, NFSV4OP_CBRECALL,
4147                     "CB Recall", &sep);
4148                 if (error != 0) {
4149                         mbuf_freem(nd->nd_mreq);
4150                         goto errout;
4151                 }
4152                 NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED + NFSX_STATEID);
4153                 *tl++ = txdr_unsigned(stateidp->seqid);
4154                 NFSBCOPY((caddr_t)stateidp->other, (caddr_t)tl,
4155                     NFSX_STATEIDOTHER);
4156                 tl += (NFSX_STATEIDOTHER / NFSX_UNSIGNED);
4157                 if (trunc)
4158                         *tl = newnfs_true;
4159                 else
4160                         *tl = newnfs_false;
4161                 (void)nfsm_fhtom(nd, (u_int8_t *)fhp, NFSX_MYFH, 0);
4162         } else if (procnum == NFSV4PROC_CBNULL) {
4163                 nd->nd_procnum = NFSV4PROC_CBNULL;
4164                 if ((clp->lc_flags & LCL_NFSV41) != 0) {
4165                         error = nfsv4_getcbsession(clp, &sep);
4166                         if (error != 0) {
4167                                 mbuf_freem(nd->nd_mreq);
4168                                 goto errout;
4169                         }
4170                 }
4171         } else {
4172                 error = NFSERR_SERVERFAULT;
4173                 mbuf_freem(nd->nd_mreq);
4174                 goto errout;
4175         }
4176
4177         /*
4178          * Call newnfs_connect(), as required, and then newnfs_request().
4179          */
4180         (void) newnfs_sndlock(&clp->lc_req.nr_lock);
4181         if (clp->lc_req.nr_client == NULL) {
4182                 if ((clp->lc_flags & LCL_NFSV41) != 0)
4183                         error = ECONNREFUSED;
4184                 else if (nd->nd_procnum == NFSV4PROC_CBNULL)
4185                         error = newnfs_connect(NULL, &clp->lc_req, cred,
4186                             NULL, 1);
4187                 else
4188                         error = newnfs_connect(NULL, &clp->lc_req, cred,
4189                             NULL, 3);
4190         }
4191         newnfs_sndunlock(&clp->lc_req.nr_lock);
4192         if (!error) {
4193                 if ((nd->nd_flag & ND_NFSV41) != 0) {
4194                         KASSERT(sep != NULL, ("sep NULL"));
4195                         if (sep->sess_cbsess.nfsess_xprt != NULL)
4196                                 error = newnfs_request(nd, NULL, clp,
4197                                     &clp->lc_req, NULL, NULL, cred,
4198                                     clp->lc_program, clp->lc_req.nr_vers, NULL,
4199                                     1, NULL, &sep->sess_cbsess);
4200                         else {
4201                                 /*
4202                                  * This should probably never occur, but if a
4203                                  * client somehow does an RPC without a
4204                                  * SequenceID Op that causes a callback just
4205                                  * after the nfsd threads have been terminated
4206                                  * and restared we could conceivably get here
4207                                  * without a backchannel xprt.
4208                                  */
4209                                 printf("nfsrv_docallback: no xprt\n");
4210                                 error = ECONNREFUSED;
4211                         }
4212                         nfsrv_freesession(sep, NULL);
4213                 } else
4214                         error = newnfs_request(nd, NULL, clp, &clp->lc_req,
4215                             NULL, NULL, cred, clp->lc_program,
4216                             clp->lc_req.nr_vers, NULL, 1, NULL, NULL);
4217         }
4218 errout:
4219         NFSFREECRED(cred);
4220
4221         /*
4222          * If error is set here, the Callback path isn't working
4223          * properly, so twiddle the appropriate LCL_ flags.
4224          * (nd_repstat != 0 indicates the Callback path is working,
4225          *  but the callback failed on the client.)
4226          */
4227         if (error) {
4228                 /*
4229                  * Mark the callback pathway down, which disabled issuing
4230                  * of delegations and gets Renew to return NFSERR_CBPATHDOWN.
4231                  */
4232                 NFSLOCKSTATE();
4233                 clp->lc_flags |= LCL_CBDOWN;
4234                 NFSUNLOCKSTATE();
4235         } else {
4236                 /*
4237                  * Callback worked. If the callback path was down, disable
4238                  * callbacks, so no more delegations will be issued. (This
4239                  * is done on the assumption that the callback pathway is
4240                  * flakey.)
4241                  */
4242                 NFSLOCKSTATE();
4243                 if (clp->lc_flags & LCL_CBDOWN)
4244                         clp->lc_flags &= ~(LCL_CBDOWN | LCL_CALLBACKSON);
4245                 NFSUNLOCKSTATE();
4246                 if (nd->nd_repstat)
4247                         error = nd->nd_repstat;
4248                 else if (error == 0 && procnum == NFSV4OP_CBGETATTR)
4249                         error = nfsv4_loadattr(nd, NULL, nap, NULL, NULL, 0,
4250                             NULL, NULL, NULL, NULL, NULL, 0, NULL, NULL, NULL,
4251                             p, NULL);
4252                 mbuf_freem(nd->nd_mrep);
4253         }
4254         NFSLOCKSTATE();
4255         clp->lc_cbref--;
4256         if ((clp->lc_flags & LCL_WAKEUPWANTED) && clp->lc_cbref == 0) {
4257                 clp->lc_flags &= ~LCL_WAKEUPWANTED;
4258                 wakeup(clp);
4259         }
4260         NFSUNLOCKSTATE();
4261
4262         NFSEXITCODE(error);
4263         return (error);
4264 }
4265
4266 /*
4267  * Set up the compound RPC for the callback.
4268  */
4269 static int
4270 nfsrv_cbcallargs(struct nfsrv_descript *nd, struct nfsclient *clp,
4271     uint32_t callback, int op, const char *optag, struct nfsdsession **sepp)
4272 {
4273         uint32_t *tl;
4274         int error, len;
4275
4276         len = strlen(optag);
4277         (void)nfsm_strtom(nd, optag, len);
4278         NFSM_BUILD(tl, uint32_t *, 4 * NFSX_UNSIGNED);
4279         if ((nd->nd_flag & ND_NFSV41) != 0) {
4280                 *tl++ = txdr_unsigned(NFSV41_MINORVERSION);
4281                 *tl++ = txdr_unsigned(callback);
4282                 *tl++ = txdr_unsigned(2);
4283                 *tl = txdr_unsigned(NFSV4OP_CBSEQUENCE);
4284                 error = nfsv4_setcbsequence(nd, clp, 1, sepp);
4285                 if (error != 0)
4286                         return (error);
4287                 NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
4288                 *tl = txdr_unsigned(op);
4289         } else {
4290                 *tl++ = txdr_unsigned(NFSV4_MINORVERSION);
4291                 *tl++ = txdr_unsigned(callback);
4292                 *tl++ = txdr_unsigned(1);
4293                 *tl = txdr_unsigned(op);
4294         }
4295         return (0);
4296 }
4297
4298 /*
4299  * Return the next index# for a clientid. Mostly just increment and return
4300  * the next one, but... if the 32bit unsigned does actually wrap around,
4301  * it should be rebooted.
4302  * At an average rate of one new client per second, it will wrap around in
4303  * approximately 136 years. (I think the server will have been shut
4304  * down or rebooted before then.)
4305  */
4306 static u_int32_t
4307 nfsrv_nextclientindex(void)
4308 {
4309         static u_int32_t client_index = 0;
4310
4311         client_index++;
4312         if (client_index != 0)
4313                 return (client_index);
4314
4315         printf("%s: out of clientids\n", __func__);
4316         return (client_index);
4317 }
4318
4319 /*
4320  * Return the next index# for a stateid. Mostly just increment and return
4321  * the next one, but... if the 32bit unsigned does actually wrap around
4322  * (will a BSD server stay up that long?), find
4323  * new start and end values.
4324  */
4325 static u_int32_t
4326 nfsrv_nextstateindex(struct nfsclient *clp)
4327 {
4328         struct nfsstate *stp;
4329         int i;
4330         u_int32_t canuse, min_index, max_index;
4331
4332         if (!(clp->lc_flags & LCL_INDEXNOTOK)) {
4333                 clp->lc_stateindex++;
4334                 if (clp->lc_stateindex != clp->lc_statemaxindex)
4335                         return (clp->lc_stateindex);
4336         }
4337
4338         /*
4339          * Yuck, we've hit the end.
4340          * Look for a new min and max.
4341          */
4342         min_index = 0;
4343         max_index = 0xffffffff;
4344         for (i = 0; i < nfsrv_statehashsize; i++) {
4345             LIST_FOREACH(stp, &clp->lc_stateid[i], ls_hash) {
4346                 if (stp->ls_stateid.other[2] > 0x80000000) {
4347                     if (stp->ls_stateid.other[2] < max_index)
4348                         max_index = stp->ls_stateid.other[2];
4349                 } else {
4350                     if (stp->ls_stateid.other[2] > min_index)
4351                         min_index = stp->ls_stateid.other[2];
4352                 }
4353             }
4354         }
4355
4356         /*
4357          * Yikes, highly unlikely, but I'll handle it anyhow.
4358          */
4359         if (min_index == 0x80000000 && max_index == 0x80000001) {
4360             canuse = 0;
4361             /*
4362              * Loop around until we find an unused entry. Return that
4363              * and set LCL_INDEXNOTOK, so the search will continue next time.
4364              * (This is one of those rare cases where a goto is the
4365              *  cleanest way to code the loop.)
4366              */
4367 tryagain:
4368             for (i = 0; i < nfsrv_statehashsize; i++) {
4369                 LIST_FOREACH(stp, &clp->lc_stateid[i], ls_hash) {
4370                     if (stp->ls_stateid.other[2] == canuse) {
4371                         canuse++;
4372                         goto tryagain;
4373                     }
4374                 }
4375             }
4376             clp->lc_flags |= LCL_INDEXNOTOK;
4377             return (canuse);
4378         }
4379
4380         /*
4381          * Ok to start again from min + 1.
4382          */
4383         clp->lc_stateindex = min_index + 1;
4384         clp->lc_statemaxindex = max_index;
4385         clp->lc_flags &= ~LCL_INDEXNOTOK;
4386         return (clp->lc_stateindex);
4387 }
4388
4389 /*
4390  * The following functions handle the stable storage file that deals with
4391  * the edge conditions described in RFC3530 Sec. 8.6.3.
4392  * The file is as follows:
4393  * - a single record at the beginning that has the lease time of the
4394  *   previous server instance (before the last reboot) and the nfsrvboottime
4395  *   values for the previous server boots.
4396  *   These previous boot times are used to ensure that the current
4397  *   nfsrvboottime does not, somehow, get set to a previous one.
4398  *   (This is important so that Stale ClientIDs and StateIDs can
4399  *    be recognized.)
4400  *   The number of previous nfsvrboottime values preceeds the list.
4401  * - followed by some number of appended records with:
4402  *   - client id string
4403  *   - flag that indicates it is a record revoking state via lease
4404  *     expiration or similar
4405  *     OR has successfully acquired state.
4406  * These structures vary in length, with the client string at the end, up
4407  * to NFSV4_OPAQUELIMIT in size.
4408  *
4409  * At the end of the grace period, the file is truncated, the first
4410  * record is rewritten with updated information and any acquired state
4411  * records for successful reclaims of state are written.
4412  *
4413  * Subsequent records are appended when the first state is issued to
4414  * a client and when state is revoked for a client.
4415  *
4416  * When reading the file in, state issued records that come later in
4417  * the file override older ones, since the append log is in cronological order.
4418  * If, for some reason, the file can't be read, the grace period is
4419  * immediately terminated and all reclaims get NFSERR_NOGRACE.
4420  */
4421
4422 /*
4423  * Read in the stable storage file. Called by nfssvc() before the nfsd
4424  * processes start servicing requests.
4425  */
4426 APPLESTATIC void
4427 nfsrv_setupstable(NFSPROC_T *p)
4428 {
4429         struct nfsrv_stablefirst *sf = &nfsrv_stablefirst;
4430         struct nfsrv_stable *sp, *nsp;
4431         struct nfst_rec *tsp;
4432         int error, i, tryagain;
4433         off_t off = 0;
4434         ssize_t aresid, len;
4435
4436         /*
4437          * If NFSNSF_UPDATEDONE is set, this is a restart of the nfsds without
4438          * a reboot, so state has not been lost.
4439          */
4440         if (sf->nsf_flags & NFSNSF_UPDATEDONE)
4441                 return;
4442         /*
4443          * Set Grace over just until the file reads successfully.
4444          */
4445         nfsrvboottime = time_second;
4446         LIST_INIT(&sf->nsf_head);
4447         sf->nsf_flags = (NFSNSF_GRACEOVER | NFSNSF_NEEDLOCK);
4448         sf->nsf_eograce = NFSD_MONOSEC + NFSRV_LEASEDELTA;
4449         if (sf->nsf_fp == NULL)
4450                 return;
4451         error = NFSD_RDWR(UIO_READ, NFSFPVNODE(sf->nsf_fp),
4452             (caddr_t)&sf->nsf_rec, sizeof (struct nfsf_rec), off, UIO_SYSSPACE,
4453             0, NFSFPCRED(sf->nsf_fp), &aresid, p);
4454         if (error || aresid || sf->nsf_numboots == 0 ||
4455                 sf->nsf_numboots > NFSNSF_MAXNUMBOOTS)
4456                 return;
4457
4458         /*
4459          * Now, read in the boottimes.
4460          */
4461         sf->nsf_bootvals = (time_t *)malloc((sf->nsf_numboots + 1) *
4462                 sizeof (time_t), M_TEMP, M_WAITOK);
4463         off = sizeof (struct nfsf_rec);
4464         error = NFSD_RDWR(UIO_READ, NFSFPVNODE(sf->nsf_fp),
4465             (caddr_t)sf->nsf_bootvals, sf->nsf_numboots * sizeof (time_t), off,
4466             UIO_SYSSPACE, 0, NFSFPCRED(sf->nsf_fp), &aresid, p);
4467         if (error || aresid) {
4468                 free((caddr_t)sf->nsf_bootvals, M_TEMP);
4469                 sf->nsf_bootvals = NULL;
4470                 return;
4471         }
4472
4473         /*
4474          * Make sure this nfsrvboottime is different from all recorded
4475          * previous ones.
4476          */
4477         do {
4478                 tryagain = 0;
4479                 for (i = 0; i < sf->nsf_numboots; i++) {
4480                         if (nfsrvboottime == sf->nsf_bootvals[i]) {
4481                                 nfsrvboottime++;
4482                                 tryagain = 1;
4483                                 break;
4484                         }
4485                 }
4486         } while (tryagain);
4487
4488         sf->nsf_flags |= NFSNSF_OK;
4489         off += (sf->nsf_numboots * sizeof (time_t));
4490
4491         /*
4492          * Read through the file, building a list of records for grace
4493          * checking.
4494          * Each record is between sizeof (struct nfst_rec) and
4495          * sizeof (struct nfst_rec) + NFSV4_OPAQUELIMIT - 1
4496          * and is actually sizeof (struct nfst_rec) + nst_len - 1.
4497          */
4498         tsp = (struct nfst_rec *)malloc(sizeof (struct nfst_rec) +
4499                 NFSV4_OPAQUELIMIT - 1, M_TEMP, M_WAITOK);
4500         do {
4501             error = NFSD_RDWR(UIO_READ, NFSFPVNODE(sf->nsf_fp),
4502                 (caddr_t)tsp, sizeof (struct nfst_rec) + NFSV4_OPAQUELIMIT - 1,
4503                 off, UIO_SYSSPACE, 0, NFSFPCRED(sf->nsf_fp), &aresid, p);
4504             len = (sizeof (struct nfst_rec) + NFSV4_OPAQUELIMIT - 1) - aresid;
4505             if (error || (len > 0 && (len < sizeof (struct nfst_rec) ||
4506                 len < (sizeof (struct nfst_rec) + tsp->len - 1)))) {
4507                 /*
4508                  * Yuck, the file has been corrupted, so just return
4509                  * after clearing out any restart state, so the grace period
4510                  * is over.
4511                  */
4512                 LIST_FOREACH_SAFE(sp, &sf->nsf_head, nst_list, nsp) {
4513                         LIST_REMOVE(sp, nst_list);
4514                         free((caddr_t)sp, M_TEMP);
4515                 }
4516                 free((caddr_t)tsp, M_TEMP);
4517                 sf->nsf_flags &= ~NFSNSF_OK;
4518                 free((caddr_t)sf->nsf_bootvals, M_TEMP);
4519                 sf->nsf_bootvals = NULL;
4520                 return;
4521             }
4522             if (len > 0) {
4523                 off += sizeof (struct nfst_rec) + tsp->len - 1;
4524                 /*
4525                  * Search the list for a matching client.
4526                  */
4527                 LIST_FOREACH(sp, &sf->nsf_head, nst_list) {
4528                         if (tsp->len == sp->nst_len &&
4529                             !NFSBCMP(tsp->client, sp->nst_client, tsp->len))
4530                                 break;
4531                 }
4532                 if (sp == LIST_END(&sf->nsf_head)) {
4533                         sp = (struct nfsrv_stable *)malloc(tsp->len +
4534                                 sizeof (struct nfsrv_stable) - 1, M_TEMP,
4535                                 M_WAITOK);
4536                         NFSBCOPY((caddr_t)tsp, (caddr_t)&sp->nst_rec,
4537                                 sizeof (struct nfst_rec) + tsp->len - 1);
4538                         LIST_INSERT_HEAD(&sf->nsf_head, sp, nst_list);
4539                 } else {
4540                         if (tsp->flag == NFSNST_REVOKE)
4541                                 sp->nst_flag |= NFSNST_REVOKE;
4542                         else
4543                                 /*
4544                                  * A subsequent timestamp indicates the client
4545                                  * did a setclientid/confirm and any previous
4546                                  * revoke is no longer relevant.
4547                                  */
4548                                 sp->nst_flag &= ~NFSNST_REVOKE;
4549                 }
4550             }
4551         } while (len > 0);
4552         free((caddr_t)tsp, M_TEMP);
4553         sf->nsf_flags = NFSNSF_OK;
4554         sf->nsf_eograce = NFSD_MONOSEC + sf->nsf_lease +
4555                 NFSRV_LEASEDELTA;
4556 }
4557
4558 /*
4559  * Update the stable storage file, now that the grace period is over.
4560  */
4561 APPLESTATIC void
4562 nfsrv_updatestable(NFSPROC_T *p)
4563 {
4564         struct nfsrv_stablefirst *sf = &nfsrv_stablefirst;
4565         struct nfsrv_stable *sp, *nsp;
4566         int i;
4567         struct nfsvattr nva;
4568         vnode_t vp;
4569 #if defined(__FreeBSD_version) && (__FreeBSD_version >= 500000)
4570         mount_t mp = NULL;
4571 #endif
4572         int error;
4573
4574         if (sf->nsf_fp == NULL || (sf->nsf_flags & NFSNSF_UPDATEDONE))
4575                 return;
4576         sf->nsf_flags |= NFSNSF_UPDATEDONE;
4577         /*
4578          * Ok, we need to rewrite the stable storage file.
4579          * - truncate to 0 length
4580          * - write the new first structure
4581          * - loop through the data structures, writing out any that
4582          *   have timestamps older than the old boot
4583          */
4584         if (sf->nsf_bootvals) {
4585                 sf->nsf_numboots++;
4586                 for (i = sf->nsf_numboots - 2; i >= 0; i--)
4587                         sf->nsf_bootvals[i + 1] = sf->nsf_bootvals[i];
4588         } else {
4589                 sf->nsf_numboots = 1;
4590                 sf->nsf_bootvals = (time_t *)malloc(sizeof (time_t),
4591                         M_TEMP, M_WAITOK);
4592         }
4593         sf->nsf_bootvals[0] = nfsrvboottime;
4594         sf->nsf_lease = nfsrv_lease;
4595         NFSVNO_ATTRINIT(&nva);
4596         NFSVNO_SETATTRVAL(&nva, size, 0);
4597         vp = NFSFPVNODE(sf->nsf_fp);
4598         vn_start_write(vp, &mp, V_WAIT);
4599         if (NFSVOPLOCK(vp, LK_EXCLUSIVE) == 0) {
4600                 error = nfsvno_setattr(vp, &nva, NFSFPCRED(sf->nsf_fp), p,
4601                     NULL);
4602                 NFSVOPUNLOCK(vp, 0);
4603         } else
4604                 error = EPERM;
4605         vn_finished_write(mp);
4606         if (!error)
4607             error = NFSD_RDWR(UIO_WRITE, vp,
4608                 (caddr_t)&sf->nsf_rec, sizeof (struct nfsf_rec), (off_t)0,
4609                 UIO_SYSSPACE, IO_SYNC, NFSFPCRED(sf->nsf_fp), NULL, p);
4610         if (!error)
4611             error = NFSD_RDWR(UIO_WRITE, vp,
4612                 (caddr_t)sf->nsf_bootvals,
4613                 sf->nsf_numboots * sizeof (time_t),
4614                 (off_t)(sizeof (struct nfsf_rec)),
4615                 UIO_SYSSPACE, IO_SYNC, NFSFPCRED(sf->nsf_fp), NULL, p);
4616         free((caddr_t)sf->nsf_bootvals, M_TEMP);
4617         sf->nsf_bootvals = NULL;
4618         if (error) {
4619                 sf->nsf_flags &= ~NFSNSF_OK;
4620                 printf("EEK! Can't write NfsV4 stable storage file\n");
4621                 return;
4622         }
4623         sf->nsf_flags |= NFSNSF_OK;
4624
4625         /*
4626          * Loop through the list and write out timestamp records for
4627          * any clients that successfully reclaimed state.
4628          */
4629         LIST_FOREACH_SAFE(sp, &sf->nsf_head, nst_list, nsp) {
4630                 if (sp->nst_flag & NFSNST_GOTSTATE) {
4631                         nfsrv_writestable(sp->nst_client, sp->nst_len,
4632                                 NFSNST_NEWSTATE, p);
4633                         sp->nst_clp->lc_flags |= LCL_STAMPEDSTABLE;
4634                 }
4635                 LIST_REMOVE(sp, nst_list);
4636                 free((caddr_t)sp, M_TEMP);
4637         }
4638         nfsrv_backupstable();
4639 }
4640
4641 /*
4642  * Append a record to the stable storage file.
4643  */
4644 APPLESTATIC void
4645 nfsrv_writestable(u_char *client, int len, int flag, NFSPROC_T *p)
4646 {
4647         struct nfsrv_stablefirst *sf = &nfsrv_stablefirst;
4648         struct nfst_rec *sp;
4649         int error;
4650
4651         if (!(sf->nsf_flags & NFSNSF_OK) || sf->nsf_fp == NULL)
4652                 return;
4653         sp = (struct nfst_rec *)malloc(sizeof (struct nfst_rec) +
4654                 len - 1, M_TEMP, M_WAITOK);
4655         sp->len = len;
4656         NFSBCOPY(client, sp->client, len);
4657         sp->flag = flag;
4658         error = NFSD_RDWR(UIO_WRITE, NFSFPVNODE(sf->nsf_fp),
4659             (caddr_t)sp, sizeof (struct nfst_rec) + len - 1, (off_t)0,
4660             UIO_SYSSPACE, (IO_SYNC | IO_APPEND), NFSFPCRED(sf->nsf_fp), NULL, p);
4661         free((caddr_t)sp, M_TEMP);
4662         if (error) {
4663                 sf->nsf_flags &= ~NFSNSF_OK;
4664                 printf("EEK! Can't write NfsV4 stable storage file\n");
4665         }
4666 }
4667
4668 /*
4669  * This function is called during the grace period to mark a client
4670  * that successfully reclaimed state.
4671  */
4672 static void
4673 nfsrv_markstable(struct nfsclient *clp)
4674 {
4675         struct nfsrv_stable *sp;
4676
4677         /*
4678          * First find the client structure.
4679          */
4680         LIST_FOREACH(sp, &nfsrv_stablefirst.nsf_head, nst_list) {
4681                 if (sp->nst_len == clp->lc_idlen &&
4682                     !NFSBCMP(sp->nst_client, clp->lc_id, sp->nst_len))
4683                         break;
4684         }
4685         if (sp == LIST_END(&nfsrv_stablefirst.nsf_head))
4686                 return;
4687
4688         /*
4689          * Now, just mark it and set the nfsclient back pointer.
4690          */
4691         sp->nst_flag |= NFSNST_GOTSTATE;
4692         sp->nst_clp = clp;
4693 }
4694
4695 /*
4696  * This function is called for a reclaim, to see if it gets grace.
4697  * It returns 0 if a reclaim is allowed, 1 otherwise.
4698  */
4699 static int
4700 nfsrv_checkstable(struct nfsclient *clp)
4701 {
4702         struct nfsrv_stable *sp;
4703
4704         /*
4705          * First, find the entry for the client.
4706          */
4707         LIST_FOREACH(sp, &nfsrv_stablefirst.nsf_head, nst_list) {
4708                 if (sp->nst_len == clp->lc_idlen &&
4709                     !NFSBCMP(sp->nst_client, clp->lc_id, sp->nst_len))
4710                         break;
4711         }
4712
4713         /*
4714          * If not in the list, state was revoked or no state was issued
4715          * since the previous reboot, a reclaim is denied.
4716          */
4717         if (sp == LIST_END(&nfsrv_stablefirst.nsf_head) ||
4718             (sp->nst_flag & NFSNST_REVOKE) ||
4719             !(nfsrv_stablefirst.nsf_flags & NFSNSF_OK))
4720                 return (1);
4721         return (0);
4722 }
4723
4724 /*
4725  * Test for and try to clear out a conflicting client. This is called by
4726  * nfsrv_lockctrl() and nfsrv_openctrl() when conflicts with other clients
4727  * a found.
4728  * The trick here is that it can't revoke a conflicting client with an
4729  * expired lease unless it holds the v4root lock, so...
4730  * If no v4root lock, get the lock and return 1 to indicate "try again".
4731  * Return 0 to indicate the conflict can't be revoked and 1 to indicate
4732  * the revocation worked and the conflicting client is "bye, bye", so it
4733  * can be tried again.
4734  * Return 2 to indicate that the vnode is VI_DOOMED after NFSVOPLOCK().
4735  * Unlocks State before a non-zero value is returned.
4736  */
4737 static int
4738 nfsrv_clientconflict(struct nfsclient *clp, int *haslockp, vnode_t vp,
4739     NFSPROC_T *p)
4740 {
4741         int gotlock, lktype = 0;
4742
4743         /*
4744          * If lease hasn't expired, we can't fix it.
4745          */
4746         if (clp->lc_expiry >= NFSD_MONOSEC ||
4747             !(nfsrv_stablefirst.nsf_flags & NFSNSF_UPDATEDONE))
4748                 return (0);
4749         if (*haslockp == 0) {
4750                 NFSUNLOCKSTATE();
4751                 if (vp != NULL) {
4752                         lktype = NFSVOPISLOCKED(vp);
4753                         NFSVOPUNLOCK(vp, 0);
4754                 }
4755                 NFSLOCKV4ROOTMUTEX();
4756                 nfsv4_relref(&nfsv4rootfs_lock);
4757                 do {
4758                         gotlock = nfsv4_lock(&nfsv4rootfs_lock, 1, NULL,
4759                             NFSV4ROOTLOCKMUTEXPTR, NULL);
4760                 } while (!gotlock);
4761                 NFSUNLOCKV4ROOTMUTEX();
4762                 *haslockp = 1;
4763                 if (vp != NULL) {
4764                         NFSVOPLOCK(vp, lktype | LK_RETRY);
4765                         if ((vp->v_iflag & VI_DOOMED) != 0)
4766                                 return (2);
4767                 }
4768                 return (1);
4769         }
4770         NFSUNLOCKSTATE();
4771
4772         /*
4773          * Ok, we can expire the conflicting client.
4774          */
4775         nfsrv_writestable(clp->lc_id, clp->lc_idlen, NFSNST_REVOKE, p);
4776         nfsrv_backupstable();
4777         nfsrv_cleanclient(clp, p);
4778         nfsrv_freedeleglist(&clp->lc_deleg);
4779         nfsrv_freedeleglist(&clp->lc_olddeleg);
4780         LIST_REMOVE(clp, lc_hash);
4781         nfsrv_zapclient(clp, p);
4782         return (1);
4783 }
4784
4785 /*
4786  * Resolve a delegation conflict.
4787  * Returns 0 to indicate the conflict was resolved without sleeping.
4788  * Return -1 to indicate that the caller should check for conflicts again.
4789  * Return > 0 for an error that should be returned, normally NFSERR_DELAY.
4790  *
4791  * Also, manipulate the nfsv4root_lock, as required. It isn't changed
4792  * for a return of 0, since there was no sleep and it could be required
4793  * later. It is released for a return of NFSERR_DELAY, since the caller
4794  * will return that error. It is released when a sleep was done waiting
4795  * for the delegation to be returned or expire (so that other nfsds can
4796  * handle ops). Then, it must be acquired for the write to stable storage.
4797  * (This function is somewhat similar to nfsrv_clientconflict(), but
4798  *  the semantics differ in a couple of subtle ways. The return of 0
4799  *  indicates the conflict was resolved without sleeping here, not
4800  *  that the conflict can't be resolved and the handling of nfsv4root_lock
4801  *  differs, as noted above.)
4802  * Unlocks State before returning a non-zero value.
4803  */
4804 static int
4805 nfsrv_delegconflict(struct nfsstate *stp, int *haslockp, NFSPROC_T *p,
4806     vnode_t vp)
4807 {
4808         struct nfsclient *clp = stp->ls_clp;
4809         int gotlock, error, lktype = 0, retrycnt, zapped_clp;
4810         nfsv4stateid_t tstateid;
4811         fhandle_t tfh;
4812
4813         /*
4814          * If the conflict is with an old delegation...
4815          */
4816         if (stp->ls_flags & NFSLCK_OLDDELEG) {
4817                 /*
4818                  * You can delete it, if it has expired.
4819                  */
4820                 if (clp->lc_delegtime < NFSD_MONOSEC) {
4821                         nfsrv_freedeleg(stp);
4822                         NFSUNLOCKSTATE();
4823                         error = -1;
4824                         goto out;
4825                 }
4826                 NFSUNLOCKSTATE();
4827                 /*
4828                  * During this delay, the old delegation could expire or it
4829                  * could be recovered by the client via an Open with
4830                  * CLAIM_DELEGATE_PREV.
4831                  * Release the nfsv4root_lock, if held.
4832                  */
4833                 if (*haslockp) {
4834                         *haslockp = 0;
4835                         NFSLOCKV4ROOTMUTEX();
4836                         nfsv4_unlock(&nfsv4rootfs_lock, 1);
4837                         NFSUNLOCKV4ROOTMUTEX();
4838                 }
4839                 error = NFSERR_DELAY;
4840                 goto out;
4841         }
4842
4843         /*
4844          * It's a current delegation, so:
4845          * - check to see if the delegation has expired
4846          *   - if so, get the v4root lock and then expire it
4847          */
4848         if (!(stp->ls_flags & NFSLCK_DELEGRECALL)) {
4849                 /*
4850                  * - do a recall callback, since not yet done
4851                  * For now, never allow truncate to be set. To use
4852                  * truncate safely, it must be guaranteed that the
4853                  * Remove, Rename or Setattr with size of 0 will
4854                  * succeed and that would require major changes to
4855                  * the VFS/Vnode OPs.
4856                  * Set the expiry time large enough so that it won't expire
4857                  * until after the callback, then set it correctly, once
4858                  * the callback is done. (The delegation will now time
4859                  * out whether or not the Recall worked ok. The timeout
4860                  * will be extended when ops are done on the delegation
4861                  * stateid, up to the timelimit.)
4862                  */
4863                 stp->ls_delegtime = NFSD_MONOSEC + (2 * nfsrv_lease) +
4864                     NFSRV_LEASEDELTA;
4865                 stp->ls_delegtimelimit = NFSD_MONOSEC + (6 * nfsrv_lease) +
4866                     NFSRV_LEASEDELTA;
4867                 stp->ls_flags |= NFSLCK_DELEGRECALL;
4868
4869                 /*
4870                  * Loop NFSRV_CBRETRYCNT times while the CBRecall replies
4871                  * NFSERR_BADSTATEID or NFSERR_BADHANDLE. This is done
4872                  * in order to try and avoid a race that could happen
4873                  * when a CBRecall request passed the Open reply with
4874                  * the delegation in it when transitting the network.
4875                  * Since nfsrv_docallback will sleep, don't use stp after
4876                  * the call.
4877                  */
4878                 NFSBCOPY((caddr_t)&stp->ls_stateid, (caddr_t)&tstateid,
4879                     sizeof (tstateid));
4880                 NFSBCOPY((caddr_t)&stp->ls_lfp->lf_fh, (caddr_t)&tfh,
4881                     sizeof (tfh));
4882                 NFSUNLOCKSTATE();
4883                 if (*haslockp) {
4884                         *haslockp = 0;
4885                         NFSLOCKV4ROOTMUTEX();
4886                         nfsv4_unlock(&nfsv4rootfs_lock, 1);
4887                         NFSUNLOCKV4ROOTMUTEX();
4888                 }
4889                 retrycnt = 0;
4890                 do {
4891                     error = nfsrv_docallback(clp, NFSV4OP_CBRECALL,
4892                         &tstateid, 0, &tfh, NULL, NULL, p);
4893                     retrycnt++;
4894                 } while ((error == NFSERR_BADSTATEID ||
4895                     error == NFSERR_BADHANDLE) && retrycnt < NFSV4_CBRETRYCNT);
4896                 error = NFSERR_DELAY;
4897                 goto out;
4898         }
4899
4900         if (clp->lc_expiry >= NFSD_MONOSEC &&
4901             stp->ls_delegtime >= NFSD_MONOSEC) {
4902                 NFSUNLOCKSTATE();
4903                 /*
4904                  * A recall has been done, but it has not yet expired.
4905                  * So, RETURN_DELAY.
4906                  */
4907                 if (*haslockp) {
4908                         *haslockp = 0;
4909                         NFSLOCKV4ROOTMUTEX();
4910                         nfsv4_unlock(&nfsv4rootfs_lock, 1);
4911                         NFSUNLOCKV4ROOTMUTEX();
4912                 }
4913                 error = NFSERR_DELAY;
4914                 goto out;
4915         }
4916
4917         /*
4918          * If we don't yet have the lock, just get it and then return,
4919          * since we need that before deleting expired state, such as
4920          * this delegation.
4921          * When getting the lock, unlock the vnode, so other nfsds that
4922          * are in progress, won't get stuck waiting for the vnode lock.
4923          */
4924         if (*haslockp == 0) {
4925                 NFSUNLOCKSTATE();
4926                 if (vp != NULL) {
4927                         lktype = NFSVOPISLOCKED(vp);
4928                         NFSVOPUNLOCK(vp, 0);
4929                 }
4930                 NFSLOCKV4ROOTMUTEX();
4931                 nfsv4_relref(&nfsv4rootfs_lock);
4932                 do {
4933                         gotlock = nfsv4_lock(&nfsv4rootfs_lock, 1, NULL,
4934                             NFSV4ROOTLOCKMUTEXPTR, NULL);
4935                 } while (!gotlock);
4936                 NFSUNLOCKV4ROOTMUTEX();
4937                 *haslockp = 1;
4938                 if (vp != NULL) {
4939                         NFSVOPLOCK(vp, lktype | LK_RETRY);
4940                         if ((vp->v_iflag & VI_DOOMED) != 0) {
4941                                 *haslockp = 0;
4942                                 NFSLOCKV4ROOTMUTEX();
4943                                 nfsv4_unlock(&nfsv4rootfs_lock, 1);
4944                                 NFSUNLOCKV4ROOTMUTEX();
4945                                 error = NFSERR_PERM;
4946                                 goto out;
4947                         }
4948                 }
4949                 error = -1;
4950                 goto out;
4951         }
4952
4953         NFSUNLOCKSTATE();
4954         /*
4955          * Ok, we can delete the expired delegation.
4956          * First, write the Revoke record to stable storage and then
4957          * clear out the conflict.
4958          * Since all other nfsd threads are now blocked, we can safely
4959          * sleep without the state changing.
4960          */
4961         nfsrv_writestable(clp->lc_id, clp->lc_idlen, NFSNST_REVOKE, p);
4962         nfsrv_backupstable();
4963         if (clp->lc_expiry < NFSD_MONOSEC) {
4964                 nfsrv_cleanclient(clp, p);
4965                 nfsrv_freedeleglist(&clp->lc_deleg);
4966                 nfsrv_freedeleglist(&clp->lc_olddeleg);
4967                 LIST_REMOVE(clp, lc_hash);
4968                 zapped_clp = 1;
4969         } else {
4970                 nfsrv_freedeleg(stp);
4971                 zapped_clp = 0;
4972         }
4973         if (zapped_clp)
4974                 nfsrv_zapclient(clp, p);
4975         error = -1;
4976
4977 out:
4978         NFSEXITCODE(error);
4979         return (error);
4980 }
4981
4982 /*
4983  * Check for a remove allowed, if remove is set to 1 and get rid of
4984  * delegations.
4985  */
4986 APPLESTATIC int
4987 nfsrv_checkremove(vnode_t vp, int remove, NFSPROC_T *p)
4988 {
4989         struct nfsstate *stp;
4990         struct nfslockfile *lfp;
4991         int error, haslock = 0;
4992         fhandle_t nfh;
4993
4994         /*
4995          * First, get the lock file structure.
4996          * (A return of -1 means no associated state, so remove ok.)
4997          */
4998         error = nfsrv_getlockfh(vp, NFSLCK_CHECK, NULL, &nfh, p);
4999 tryagain:
5000         NFSLOCKSTATE();
5001         if (!error)
5002                 error = nfsrv_getlockfile(NFSLCK_CHECK, NULL, &lfp, &nfh, 0);
5003         if (error) {
5004                 NFSUNLOCKSTATE();
5005                 if (haslock) {
5006                         NFSLOCKV4ROOTMUTEX();
5007                         nfsv4_unlock(&nfsv4rootfs_lock, 1);
5008                         NFSUNLOCKV4ROOTMUTEX();
5009                 }
5010                 if (error == -1)
5011                         error = 0;
5012                 goto out;
5013         }
5014
5015         /*
5016          * Now, we must Recall any delegations.
5017          */
5018         error = nfsrv_cleandeleg(vp, lfp, NULL, &haslock, p);
5019         if (error) {
5020                 /*
5021                  * nfsrv_cleandeleg() unlocks state for non-zero
5022                  * return.
5023                  */
5024                 if (error == -1)
5025                         goto tryagain;
5026                 if (haslock) {
5027                         NFSLOCKV4ROOTMUTEX();
5028                         nfsv4_unlock(&nfsv4rootfs_lock, 1);
5029                         NFSUNLOCKV4ROOTMUTEX();
5030                 }
5031                 goto out;
5032         }
5033
5034         /*
5035          * Now, look for a conflicting open share.
5036          */
5037         if (remove) {
5038                 LIST_FOREACH(stp, &lfp->lf_open, ls_file) {
5039                         if (stp->ls_flags & NFSLCK_WRITEDENY) {
5040                                 error = NFSERR_FILEOPEN;
5041                                 break;
5042                         }
5043                 }
5044         }
5045
5046         NFSUNLOCKSTATE();
5047         if (haslock) {
5048                 NFSLOCKV4ROOTMUTEX();
5049                 nfsv4_unlock(&nfsv4rootfs_lock, 1);
5050                 NFSUNLOCKV4ROOTMUTEX();
5051         }
5052
5053 out:
5054         NFSEXITCODE(error);
5055         return (error);
5056 }
5057
5058 /*
5059  * Clear out all delegations for the file referred to by lfp.
5060  * May return NFSERR_DELAY, if there will be a delay waiting for
5061  * delegations to expire.
5062  * Returns -1 to indicate it slept while recalling a delegation.
5063  * This function has the side effect of deleting the nfslockfile structure,
5064  * if it no longer has associated state and didn't have to sleep.
5065  * Unlocks State before a non-zero value is returned.
5066  */
5067 static int
5068 nfsrv_cleandeleg(vnode_t vp, struct nfslockfile *lfp,
5069     struct nfsclient *clp, int *haslockp, NFSPROC_T *p)
5070 {
5071         struct nfsstate *stp, *nstp;
5072         int ret = 0;
5073
5074         stp = LIST_FIRST(&lfp->lf_deleg);
5075         while (stp != LIST_END(&lfp->lf_deleg)) {
5076                 nstp = LIST_NEXT(stp, ls_file);
5077                 if (stp->ls_clp != clp) {
5078                         ret = nfsrv_delegconflict(stp, haslockp, p, vp);
5079                         if (ret) {
5080                                 /*
5081                                  * nfsrv_delegconflict() unlocks state
5082                                  * when it returns non-zero.
5083                                  */
5084                                 goto out;
5085                         }
5086                 }
5087                 stp = nstp;
5088         }
5089 out:
5090         NFSEXITCODE(ret);
5091         return (ret);
5092 }
5093
5094 /*
5095  * There are certain operations that, when being done outside of NFSv4,
5096  * require that any NFSv4 delegation for the file be recalled.
5097  * This function is to be called for those cases:
5098  * VOP_RENAME() - When a delegation is being recalled for any reason,
5099  *      the client may have to do Opens against the server, using the file's
5100  *      final component name. If the file has been renamed on the server,
5101  *      that component name will be incorrect and the Open will fail.
5102  * VOP_REMOVE() - Theoretically, a client could Open a file after it has
5103  *      been removed on the server, if there is a delegation issued to
5104  *      that client for the file. I say "theoretically" since clients
5105  *      normally do an Access Op before the Open and that Access Op will
5106  *      fail with ESTALE. Note that NFSv2 and 3 don't even do Opens, so
5107  *      they will detect the file's removal in the same manner. (There is
5108  *      one case where RFC3530 allows a client to do an Open without first
5109  *      doing an Access Op, which is passage of a check against the ACE
5110  *      returned with a Write delegation, but current practice is to ignore
5111  *      the ACE and always do an Access Op.)
5112  *      Since the functions can only be called with an unlocked vnode, this
5113  *      can't be done at this time.
5114  * VOP_ADVLOCK() - When a client holds a delegation, it can issue byte range
5115  *      locks locally in the client, which are not visible to the server. To
5116  *      deal with this, issuing of delegations for a vnode must be disabled
5117  *      and all delegations for the vnode recalled. This is done via the
5118  *      second function, using the VV_DISABLEDELEG vflag on the vnode.
5119  */
5120 APPLESTATIC void
5121 nfsd_recalldelegation(vnode_t vp, NFSPROC_T *p)
5122 {
5123         time_t starttime;
5124         int error;
5125
5126         /*
5127          * First, check to see if the server is currently running and it has
5128          * been called for a regular file when issuing delegations.
5129          */
5130         if (newnfs_numnfsd == 0 || vp->v_type != VREG ||
5131             nfsrv_issuedelegs == 0)
5132                 return;
5133
5134         KASSERT((NFSVOPISLOCKED(vp) != LK_EXCLUSIVE), ("vp %p is locked", vp));
5135         /*
5136          * First, get a reference on the nfsv4rootfs_lock so that an
5137          * exclusive lock cannot be acquired by another thread.
5138          */
5139         NFSLOCKV4ROOTMUTEX();
5140         nfsv4_getref(&nfsv4rootfs_lock, NULL, NFSV4ROOTLOCKMUTEXPTR, NULL);
5141         NFSUNLOCKV4ROOTMUTEX();
5142
5143         /*
5144          * Now, call nfsrv_checkremove() in a loop while it returns
5145          * NFSERR_DELAY. Return upon any other error or when timed out.
5146          */
5147         starttime = NFSD_MONOSEC;
5148         do {
5149                 if (NFSVOPLOCK(vp, LK_EXCLUSIVE) == 0) {
5150                         error = nfsrv_checkremove(vp, 0, p);
5151                         NFSVOPUNLOCK(vp, 0);
5152                 } else
5153                         error = EPERM;
5154                 if (error == NFSERR_DELAY) {
5155                         if (NFSD_MONOSEC - starttime > NFS_REMOVETIMEO)
5156                                 break;
5157                         /* Sleep for a short period of time */
5158                         (void) nfs_catnap(PZERO, 0, "nfsremove");
5159                 }
5160         } while (error == NFSERR_DELAY);
5161         NFSLOCKV4ROOTMUTEX();
5162         nfsv4_relref(&nfsv4rootfs_lock);
5163         NFSUNLOCKV4ROOTMUTEX();
5164 }
5165
5166 APPLESTATIC void
5167 nfsd_disabledelegation(vnode_t vp, NFSPROC_T *p)
5168 {
5169
5170 #ifdef VV_DISABLEDELEG
5171         /*
5172          * First, flag issuance of delegations disabled.
5173          */
5174         atomic_set_long(&vp->v_vflag, VV_DISABLEDELEG);
5175 #endif
5176
5177         /*
5178          * Then call nfsd_recalldelegation() to get rid of all extant
5179          * delegations.
5180          */
5181         nfsd_recalldelegation(vp, p);
5182 }
5183
5184 /*
5185  * Check for conflicting locks, etc. and then get rid of delegations.
5186  * (At one point I thought that I should get rid of delegations for any
5187  *  Setattr, since it could potentially disallow the I/O op (read or write)
5188  *  allowed by the delegation. However, Setattr Ops that aren't changing
5189  *  the size get a stateid of all 0s, so you can't tell if it is a delegation
5190  *  for the same client or a different one, so I decided to only get rid
5191  *  of delegations for other clients when the size is being changed.)
5192  * In general, a Setattr can disable NFS I/O Ops that are outstanding, such
5193  * as Write backs, even if there is no delegation, so it really isn't any
5194  * different?)
5195  */
5196 APPLESTATIC int
5197 nfsrv_checksetattr(vnode_t vp, struct nfsrv_descript *nd,
5198     nfsv4stateid_t *stateidp, struct nfsvattr *nvap, nfsattrbit_t *attrbitp,
5199     struct nfsexstuff *exp, NFSPROC_T *p)
5200 {
5201         struct nfsstate st, *stp = &st;
5202         struct nfslock lo, *lop = &lo;
5203         int error = 0;
5204         nfsquad_t clientid;
5205
5206         if (NFSISSET_ATTRBIT(attrbitp, NFSATTRBIT_SIZE)) {
5207                 stp->ls_flags = (NFSLCK_CHECK | NFSLCK_WRITEACCESS);
5208                 lop->lo_first = nvap->na_size;
5209         } else {
5210                 stp->ls_flags = 0;
5211                 lop->lo_first = 0;
5212         }
5213         if (NFSISSET_ATTRBIT(attrbitp, NFSATTRBIT_OWNER) ||
5214             NFSISSET_ATTRBIT(attrbitp, NFSATTRBIT_OWNERGROUP) ||
5215             NFSISSET_ATTRBIT(attrbitp, NFSATTRBIT_MODE) ||
5216             NFSISSET_ATTRBIT(attrbitp, NFSATTRBIT_ACL))
5217                 stp->ls_flags |= NFSLCK_SETATTR;
5218         if (stp->ls_flags == 0)
5219                 goto out;
5220         lop->lo_end = NFS64BITSSET;
5221         lop->lo_flags = NFSLCK_WRITE;
5222         stp->ls_ownerlen = 0;
5223         stp->ls_op = NULL;
5224         stp->ls_uid = nd->nd_cred->cr_uid;
5225         stp->ls_stateid.seqid = stateidp->seqid;
5226         clientid.lval[0] = stp->ls_stateid.other[0] = stateidp->other[0];
5227         clientid.lval[1] = stp->ls_stateid.other[1] = stateidp->other[1];
5228         stp->ls_stateid.other[2] = stateidp->other[2];
5229         error = nfsrv_lockctrl(vp, &stp, &lop, NULL, clientid,
5230             stateidp, exp, nd, p);
5231
5232 out:
5233         NFSEXITCODE2(error, nd);
5234         return (error);
5235 }
5236
5237 /*
5238  * Check for a write delegation and do a CBGETATTR if there is one, updating
5239  * the attributes, as required.
5240  * Should I return an error if I can't get the attributes? (For now, I'll
5241  * just return ok.
5242  */
5243 APPLESTATIC int
5244 nfsrv_checkgetattr(struct nfsrv_descript *nd, vnode_t vp,
5245     struct nfsvattr *nvap, nfsattrbit_t *attrbitp, struct ucred *cred,
5246     NFSPROC_T *p)
5247 {
5248         struct nfsstate *stp;
5249         struct nfslockfile *lfp;
5250         struct nfsclient *clp;
5251         struct nfsvattr nva;
5252         fhandle_t nfh;
5253         int error = 0;
5254         nfsattrbit_t cbbits;
5255         u_quad_t delegfilerev;
5256
5257         NFSCBGETATTR_ATTRBIT(attrbitp, &cbbits);
5258         if (!NFSNONZERO_ATTRBIT(&cbbits))
5259                 goto out;
5260
5261         /*
5262          * Get the lock file structure.
5263          * (A return of -1 means no associated state, so return ok.)
5264          */
5265         error = nfsrv_getlockfh(vp, NFSLCK_CHECK, NULL, &nfh, p);
5266         NFSLOCKSTATE();
5267         if (!error)
5268                 error = nfsrv_getlockfile(NFSLCK_CHECK, NULL, &lfp, &nfh, 0);
5269         if (error) {
5270                 NFSUNLOCKSTATE();
5271                 if (error == -1)
5272                         error = 0;
5273                 goto out;
5274         }
5275
5276         /*
5277          * Now, look for a write delegation.
5278          */
5279         LIST_FOREACH(stp, &lfp->lf_deleg, ls_file) {
5280                 if (stp->ls_flags & NFSLCK_DELEGWRITE)
5281                         break;
5282         }
5283         if (stp == LIST_END(&lfp->lf_deleg)) {
5284                 NFSUNLOCKSTATE();
5285                 goto out;
5286         }
5287         clp = stp->ls_clp;
5288         delegfilerev = stp->ls_filerev;
5289
5290         /*
5291          * If the Write delegation was issued as a part of this Compound RPC
5292          * or if we have an Implied Clientid (used in a previous Op in this
5293          * compound) and it is the client the delegation was issued to,
5294          * just return ok.
5295          * I also assume that it is from the same client iff the network
5296          * host IP address is the same as the callback address. (Not
5297          * exactly correct by the RFC, but avoids a lot of Getattr
5298          * callbacks.)
5299          */
5300         if (nd->nd_compref == stp->ls_compref ||
5301             ((nd->nd_flag & ND_IMPLIEDCLID) &&
5302              clp->lc_clientid.qval == nd->nd_clientid.qval) ||
5303              nfsaddr2_match(clp->lc_req.nr_nam, nd->nd_nam)) {
5304                 NFSUNLOCKSTATE();
5305                 goto out;
5306         }
5307
5308         /*
5309          * We are now done with the delegation state structure,
5310          * so the statelock can be released and we can now tsleep().
5311          */
5312
5313         /*
5314          * Now, we must do the CB Getattr callback, to see if Change or Size
5315          * has changed.
5316          */
5317         if (clp->lc_expiry >= NFSD_MONOSEC) {
5318                 NFSUNLOCKSTATE();
5319                 NFSVNO_ATTRINIT(&nva);
5320                 nva.na_filerev = NFS64BITSSET;
5321                 error = nfsrv_docallback(clp, NFSV4OP_CBGETATTR, NULL,
5322                     0, &nfh, &nva, &cbbits, p);
5323                 if (!error) {
5324                         if ((nva.na_filerev != NFS64BITSSET &&
5325                             nva.na_filerev > delegfilerev) ||
5326                             (NFSVNO_ISSETSIZE(&nva) &&
5327                              nva.na_size != nvap->na_size)) {
5328                                 error = nfsvno_updfilerev(vp, nvap, cred, p);
5329                                 if (NFSVNO_ISSETSIZE(&nva))
5330                                         nvap->na_size = nva.na_size;
5331                         }
5332                 } else
5333                         error = 0;      /* Ignore callback errors for now. */
5334         } else {
5335                 NFSUNLOCKSTATE();
5336         }
5337
5338 out:
5339         NFSEXITCODE2(error, nd);
5340         return (error);
5341 }
5342
5343 /*
5344  * This function looks for openowners that haven't had any opens for
5345  * a while and throws them away. Called by an nfsd when NFSNSF_NOOPENS
5346  * is set.
5347  */
5348 APPLESTATIC void
5349 nfsrv_throwawayopens(NFSPROC_T *p)
5350 {
5351         struct nfsclient *clp, *nclp;
5352         struct nfsstate *stp, *nstp;
5353         int i;
5354
5355         NFSLOCKSTATE();
5356         nfsrv_stablefirst.nsf_flags &= ~NFSNSF_NOOPENS;
5357         /*
5358          * For each client...
5359          */
5360         for (i = 0; i < nfsrv_clienthashsize; i++) {
5361             LIST_FOREACH_SAFE(clp, &nfsclienthash[i], lc_hash, nclp) {
5362                 LIST_FOREACH_SAFE(stp, &clp->lc_open, ls_list, nstp) {
5363                         if (LIST_EMPTY(&stp->ls_open) &&
5364                             (stp->ls_noopens > NFSNOOPEN ||
5365                              (nfsrv_openpluslock * 2) >
5366                              nfsrv_v4statelimit))
5367                                 nfsrv_freeopenowner(stp, 0, p);
5368                 }
5369             }
5370         }
5371         NFSUNLOCKSTATE();
5372 }
5373
5374 /*
5375  * This function checks to see if the credentials are the same.
5376  * Returns 1 for not same, 0 otherwise.
5377  */
5378 static int
5379 nfsrv_notsamecredname(struct nfsrv_descript *nd, struct nfsclient *clp)
5380 {
5381
5382         if (nd->nd_flag & ND_GSS) {
5383                 if (!(clp->lc_flags & LCL_GSS))
5384                         return (1);
5385                 if (clp->lc_flags & LCL_NAME) {
5386                         if (nd->nd_princlen != clp->lc_namelen ||
5387                             NFSBCMP(nd->nd_principal, clp->lc_name,
5388                                 clp->lc_namelen))
5389                                 return (1);
5390                         else
5391                                 return (0);
5392                 }
5393                 if (nd->nd_cred->cr_uid == clp->lc_uid)
5394                         return (0);
5395                 else
5396                         return (1);
5397         } else if (clp->lc_flags & LCL_GSS)
5398                 return (1);
5399         /*
5400          * For AUTH_SYS, allow the same uid or root. (This is underspecified
5401          * in RFC3530, which talks about principals, but doesn't say anything
5402          * about uids for AUTH_SYS.)
5403          */
5404         if (nd->nd_cred->cr_uid == clp->lc_uid || nd->nd_cred->cr_uid == 0)
5405                 return (0);
5406         else
5407                 return (1);
5408 }
5409
5410 /*
5411  * Calculate the lease expiry time.
5412  */
5413 static time_t
5414 nfsrv_leaseexpiry(void)
5415 {
5416
5417         if (nfsrv_stablefirst.nsf_eograce > NFSD_MONOSEC)
5418                 return (NFSD_MONOSEC + 2 * (nfsrv_lease + NFSRV_LEASEDELTA));
5419         return (NFSD_MONOSEC + nfsrv_lease + NFSRV_LEASEDELTA);
5420 }
5421
5422 /*
5423  * Delay the delegation timeout as far as ls_delegtimelimit, as required.
5424  */
5425 static void
5426 nfsrv_delaydelegtimeout(struct nfsstate *stp)
5427 {
5428
5429         if ((stp->ls_flags & NFSLCK_DELEGRECALL) == 0)
5430                 return;
5431
5432         if ((stp->ls_delegtime + 15) > NFSD_MONOSEC &&
5433             stp->ls_delegtime < stp->ls_delegtimelimit) {
5434                 stp->ls_delegtime += nfsrv_lease;
5435                 if (stp->ls_delegtime > stp->ls_delegtimelimit)
5436                         stp->ls_delegtime = stp->ls_delegtimelimit;
5437         }
5438 }
5439
5440 /*
5441  * This function checks to see if there is any other state associated
5442  * with the openowner for this Open.
5443  * It returns 1 if there is no other state, 0 otherwise.
5444  */
5445 static int
5446 nfsrv_nootherstate(struct nfsstate *stp)
5447 {
5448         struct nfsstate *tstp;
5449
5450         LIST_FOREACH(tstp, &stp->ls_openowner->ls_open, ls_list) {
5451                 if (tstp != stp || !LIST_EMPTY(&tstp->ls_lock))
5452                         return (0);
5453         }
5454         return (1);
5455 }
5456
5457 /*
5458  * Create a list of lock deltas (changes to local byte range locking
5459  * that can be rolled back using the list) and apply the changes via
5460  * nfsvno_advlock(). Optionally, lock the list. It is expected that either
5461  * the rollback or update function will be called after this.
5462  * It returns an error (and rolls back, as required), if any nfsvno_advlock()
5463  * call fails. If it returns an error, it will unlock the list.
5464  */
5465 static int
5466 nfsrv_locallock(vnode_t vp, struct nfslockfile *lfp, int flags,
5467     uint64_t first, uint64_t end, struct nfslockconflict *cfp, NFSPROC_T *p)
5468 {
5469         struct nfslock *lop, *nlop;
5470         int error = 0;
5471
5472         /* Loop through the list of locks. */
5473         lop = LIST_FIRST(&lfp->lf_locallock);
5474         while (first < end && lop != NULL) {
5475                 nlop = LIST_NEXT(lop, lo_lckowner);
5476                 if (first >= lop->lo_end) {
5477                         /* not there yet */
5478                         lop = nlop;
5479                 } else if (first < lop->lo_first) {
5480                         /* new one starts before entry in list */
5481                         if (end <= lop->lo_first) {
5482                                 /* no overlap between old and new */
5483                                 error = nfsrv_dolocal(vp, lfp, flags,
5484                                     NFSLCK_UNLOCK, first, end, cfp, p);
5485                                 if (error != 0)
5486                                         break;
5487                                 first = end;
5488                         } else {
5489                                 /* handle fragment overlapped with new one */
5490                                 error = nfsrv_dolocal(vp, lfp, flags,
5491                                     NFSLCK_UNLOCK, first, lop->lo_first, cfp,
5492                                     p);
5493                                 if (error != 0)
5494                                         break;
5495                                 first = lop->lo_first;
5496                         }
5497                 } else {
5498                         /* new one overlaps this entry in list */
5499                         if (end <= lop->lo_end) {
5500                                 /* overlaps all of new one */
5501                                 error = nfsrv_dolocal(vp, lfp, flags,
5502                                     lop->lo_flags, first, end, cfp, p);
5503                                 if (error != 0)
5504                                         break;
5505                                 first = end;
5506                         } else {
5507                                 /* handle fragment overlapped with new one */
5508                                 error = nfsrv_dolocal(vp, lfp, flags,
5509                                     lop->lo_flags, first, lop->lo_end, cfp, p);
5510                                 if (error != 0)
5511                                         break;
5512                                 first = lop->lo_end;
5513                                 lop = nlop;
5514                         }
5515                 }
5516         }
5517         if (first < end && error == 0)
5518                 /* handle fragment past end of list */
5519                 error = nfsrv_dolocal(vp, lfp, flags, NFSLCK_UNLOCK, first,
5520                     end, cfp, p);
5521
5522         NFSEXITCODE(error);
5523         return (error);
5524 }
5525
5526 /*
5527  * Local lock unlock. Unlock all byte ranges that are no longer locked
5528  * by NFSv4. To do this, unlock any subranges of first-->end that
5529  * do not overlap with the byte ranges of any lock in the lfp->lf_lock
5530  * list. This list has all locks for the file held by other
5531  * <clientid, lockowner> tuples. The list is ordered by increasing
5532  * lo_first value, but may have entries that overlap each other, for
5533  * the case of read locks.
5534  */
5535 static void
5536 nfsrv_localunlock(vnode_t vp, struct nfslockfile *lfp, uint64_t init_first,
5537     uint64_t init_end, NFSPROC_T *p)
5538 {
5539         struct nfslock *lop;
5540         uint64_t first, end, prevfirst;
5541
5542         first = init_first;
5543         end = init_end;
5544         while (first < init_end) {
5545                 /* Loop through all nfs locks, adjusting first and end */
5546                 prevfirst = 0;
5547                 LIST_FOREACH(lop, &lfp->lf_lock, lo_lckfile) {
5548                         KASSERT(prevfirst <= lop->lo_first,
5549                             ("nfsv4 locks out of order"));
5550                         KASSERT(lop->lo_first < lop->lo_end,
5551                             ("nfsv4 bogus lock"));
5552                         prevfirst = lop->lo_first;
5553                         if (first >= lop->lo_first &&
5554                             first < lop->lo_end)
5555                                 /*
5556                                  * Overlaps with initial part, so trim
5557                                  * off that initial part by moving first past
5558                                  * it.
5559                                  */
5560                                 first = lop->lo_end;
5561                         else if (end > lop->lo_first &&
5562                             lop->lo_first > first) {
5563                                 /*
5564                                  * This lock defines the end of the
5565                                  * segment to unlock, so set end to the
5566                                  * start of it and break out of the loop.
5567                                  */
5568                                 end = lop->lo_first;
5569                                 break;
5570                         }
5571                         if (first >= end)
5572                                 /*
5573                                  * There is no segment left to do, so
5574                                  * break out of this loop and then exit
5575                                  * the outer while() since first will be set
5576                                  * to end, which must equal init_end here.
5577                                  */
5578                                 break;
5579                 }
5580                 if (first < end) {
5581                         /* Unlock this segment */
5582                         (void) nfsrv_dolocal(vp, lfp, NFSLCK_UNLOCK,
5583                             NFSLCK_READ, first, end, NULL, p);
5584                         nfsrv_locallock_commit(lfp, NFSLCK_UNLOCK,
5585                             first, end);
5586                 }
5587                 /*
5588                  * Now move past this segment and look for any further
5589                  * segment in the range, if there is one.
5590                  */
5591                 first = end;
5592                 end = init_end;
5593         }
5594 }
5595
5596 /*
5597  * Do the local lock operation and update the rollback list, as required.
5598  * Perform the rollback and return the error if nfsvno_advlock() fails.
5599  */
5600 static int
5601 nfsrv_dolocal(vnode_t vp, struct nfslockfile *lfp, int flags, int oldflags,
5602     uint64_t first, uint64_t end, struct nfslockconflict *cfp, NFSPROC_T *p)
5603 {
5604         struct nfsrollback *rlp;
5605         int error = 0, ltype, oldltype;
5606
5607         if (flags & NFSLCK_WRITE)
5608                 ltype = F_WRLCK;
5609         else if (flags & NFSLCK_READ)
5610                 ltype = F_RDLCK;
5611         else
5612                 ltype = F_UNLCK;
5613         if (oldflags & NFSLCK_WRITE)
5614                 oldltype = F_WRLCK;
5615         else if (oldflags & NFSLCK_READ)
5616                 oldltype = F_RDLCK;
5617         else
5618                 oldltype = F_UNLCK;
5619         if (ltype == oldltype || (oldltype == F_WRLCK && ltype == F_RDLCK))
5620                 /* nothing to do */
5621                 goto out;
5622         error = nfsvno_advlock(vp, ltype, first, end, p);
5623         if (error != 0) {
5624                 if (cfp != NULL) {
5625                         cfp->cl_clientid.lval[0] = 0;
5626                         cfp->cl_clientid.lval[1] = 0;
5627                         cfp->cl_first = 0;
5628                         cfp->cl_end = NFS64BITSSET;
5629                         cfp->cl_flags = NFSLCK_WRITE;
5630                         cfp->cl_ownerlen = 5;
5631                         NFSBCOPY("LOCAL", cfp->cl_owner, 5);
5632                 }
5633                 nfsrv_locallock_rollback(vp, lfp, p);
5634         } else if (ltype != F_UNLCK) {
5635                 rlp = malloc(sizeof (struct nfsrollback), M_NFSDROLLBACK,
5636                     M_WAITOK);
5637                 rlp->rlck_first = first;
5638                 rlp->rlck_end = end;
5639                 rlp->rlck_type = oldltype;
5640                 LIST_INSERT_HEAD(&lfp->lf_rollback, rlp, rlck_list);
5641         }
5642
5643 out:
5644         NFSEXITCODE(error);
5645         return (error);
5646 }
5647
5648 /*
5649  * Roll back local lock changes and free up the rollback list.
5650  */
5651 static void
5652 nfsrv_locallock_rollback(vnode_t vp, struct nfslockfile *lfp, NFSPROC_T *p)
5653 {
5654         struct nfsrollback *rlp, *nrlp;
5655
5656         LIST_FOREACH_SAFE(rlp, &lfp->lf_rollback, rlck_list, nrlp) {
5657                 (void) nfsvno_advlock(vp, rlp->rlck_type, rlp->rlck_first,
5658                     rlp->rlck_end, p);
5659                 free(rlp, M_NFSDROLLBACK);
5660         }
5661         LIST_INIT(&lfp->lf_rollback);
5662 }
5663
5664 /*
5665  * Update local lock list and delete rollback list (ie now committed to the
5666  * local locks). Most of the work is done by the internal function.
5667  */
5668 static void
5669 nfsrv_locallock_commit(struct nfslockfile *lfp, int flags, uint64_t first,
5670     uint64_t end)
5671 {
5672         struct nfsrollback *rlp, *nrlp;
5673         struct nfslock *new_lop, *other_lop;
5674
5675         new_lop = malloc(sizeof (struct nfslock), M_NFSDLOCK, M_WAITOK);
5676         if (flags & (NFSLCK_READ | NFSLCK_WRITE))
5677                 other_lop = malloc(sizeof (struct nfslock), M_NFSDLOCK,
5678                     M_WAITOK);
5679         else
5680                 other_lop = NULL;
5681         new_lop->lo_flags = flags;
5682         new_lop->lo_first = first;
5683         new_lop->lo_end = end;
5684         nfsrv_updatelock(NULL, &new_lop, &other_lop, lfp);
5685         if (new_lop != NULL)
5686                 free(new_lop, M_NFSDLOCK);
5687         if (other_lop != NULL)
5688                 free(other_lop, M_NFSDLOCK);
5689
5690         /* and get rid of the rollback list */
5691         LIST_FOREACH_SAFE(rlp, &lfp->lf_rollback, rlck_list, nrlp)
5692                 free(rlp, M_NFSDROLLBACK);
5693         LIST_INIT(&lfp->lf_rollback);
5694 }
5695
5696 /*
5697  * Lock the struct nfslockfile for local lock updating.
5698  */
5699 static void
5700 nfsrv_locklf(struct nfslockfile *lfp)
5701 {
5702         int gotlock;
5703
5704         /* lf_usecount ensures *lfp won't be free'd */
5705         lfp->lf_usecount++;
5706         do {
5707                 gotlock = nfsv4_lock(&lfp->lf_locallock_lck, 1, NULL,
5708                     NFSSTATEMUTEXPTR, NULL);
5709         } while (gotlock == 0);
5710         lfp->lf_usecount--;
5711 }
5712
5713 /*
5714  * Unlock the struct nfslockfile after local lock updating.
5715  */
5716 static void
5717 nfsrv_unlocklf(struct nfslockfile *lfp)
5718 {
5719
5720         nfsv4_unlock(&lfp->lf_locallock_lck, 0);
5721 }
5722
5723 /*
5724  * Clear out all state for the NFSv4 server.
5725  * Must be called by a thread that can sleep when no nfsds are running.
5726  */
5727 void
5728 nfsrv_throwawayallstate(NFSPROC_T *p)
5729 {
5730         struct nfsclient *clp, *nclp;
5731         struct nfslockfile *lfp, *nlfp;
5732         int i;
5733
5734         /*
5735          * For each client, clean out the state and then free the structure.
5736          */
5737         for (i = 0; i < nfsrv_clienthashsize; i++) {
5738                 LIST_FOREACH_SAFE(clp, &nfsclienthash[i], lc_hash, nclp) {
5739                         nfsrv_cleanclient(clp, p);
5740                         nfsrv_freedeleglist(&clp->lc_deleg);
5741                         nfsrv_freedeleglist(&clp->lc_olddeleg);
5742                         free(clp->lc_stateid, M_NFSDCLIENT);
5743                         free(clp, M_NFSDCLIENT);
5744                 }
5745         }
5746
5747         /*
5748          * Also, free up any remaining lock file structures.
5749          */
5750         for (i = 0; i < nfsrv_lockhashsize; i++) {
5751                 LIST_FOREACH_SAFE(lfp, &nfslockhash[i], lf_hash, nlfp) {
5752                         printf("nfsd unload: fnd a lock file struct\n");
5753                         nfsrv_freenfslockfile(lfp);
5754                 }
5755         }
5756 }
5757
5758 /*
5759  * Check the sequence# for the session and slot provided as an argument.
5760  * Also, renew the lease if the session will return NFS_OK.
5761  */
5762 int
5763 nfsrv_checksequence(struct nfsrv_descript *nd, uint32_t sequenceid,
5764     uint32_t *highest_slotidp, uint32_t *target_highest_slotidp, int cache_this,
5765     uint32_t *sflagsp, NFSPROC_T *p)
5766 {
5767         struct nfsdsession *sep;
5768         struct nfssessionhash *shp;
5769         int error;
5770         SVCXPRT *savxprt;
5771
5772         shp = NFSSESSIONHASH(nd->nd_sessionid);
5773         NFSLOCKSESSION(shp);
5774         sep = nfsrv_findsession(nd->nd_sessionid);
5775         if (sep == NULL) {
5776                 NFSUNLOCKSESSION(shp);
5777                 return (NFSERR_BADSESSION);
5778         }
5779         error = nfsv4_seqsession(sequenceid, nd->nd_slotid, *highest_slotidp,
5780             sep->sess_slots, NULL, NFSV4_SLOTS - 1);
5781         if (error != 0) {
5782                 NFSUNLOCKSESSION(shp);
5783                 return (error);
5784         }
5785         if (cache_this != 0)
5786                 nd->nd_flag |= ND_SAVEREPLY;
5787         /* Renew the lease. */
5788         sep->sess_clp->lc_expiry = nfsrv_leaseexpiry();
5789         nd->nd_clientid.qval = sep->sess_clp->lc_clientid.qval;
5790         nd->nd_flag |= ND_IMPLIEDCLID;
5791
5792         /*
5793          * If this session handles the backchannel, save the nd_xprt for this
5794          * RPC, since this is the one being used.
5795          */
5796         if (sep->sess_clp->lc_req.nr_client != NULL &&
5797             (sep->sess_crflags & NFSV4CRSESS_CONNBACKCHAN) != 0) {
5798                 savxprt = sep->sess_cbsess.nfsess_xprt;
5799                 SVC_ACQUIRE(nd->nd_xprt);
5800                 nd->nd_xprt->xp_p2 =
5801                     sep->sess_clp->lc_req.nr_client->cl_private;
5802                 nd->nd_xprt->xp_idletimeout = 0;        /* Disable timeout. */
5803                 sep->sess_cbsess.nfsess_xprt = nd->nd_xprt;
5804                 if (savxprt != NULL)
5805                         SVC_RELEASE(savxprt);
5806         }
5807
5808         *sflagsp = 0;
5809         if (sep->sess_clp->lc_req.nr_client == NULL)
5810                 *sflagsp |= NFSV4SEQ_CBPATHDOWN;
5811         NFSUNLOCKSESSION(shp);
5812         if (error == NFSERR_EXPIRED) {
5813                 *sflagsp |= NFSV4SEQ_EXPIREDALLSTATEREVOKED;
5814                 error = 0;
5815         } else if (error == NFSERR_ADMINREVOKED) {
5816                 *sflagsp |= NFSV4SEQ_ADMINSTATEREVOKED;
5817                 error = 0;
5818         }
5819         *highest_slotidp = *target_highest_slotidp = NFSV4_SLOTS - 1;
5820         return (0);
5821 }
5822
5823 /*
5824  * Check/set reclaim complete for this session/clientid.
5825  */
5826 int
5827 nfsrv_checkreclaimcomplete(struct nfsrv_descript *nd)
5828 {
5829         struct nfsdsession *sep;
5830         struct nfssessionhash *shp;
5831         int error = 0;
5832
5833         shp = NFSSESSIONHASH(nd->nd_sessionid);
5834         NFSLOCKSTATE();
5835         NFSLOCKSESSION(shp);
5836         sep = nfsrv_findsession(nd->nd_sessionid);
5837         if (sep == NULL) {
5838                 NFSUNLOCKSESSION(shp);
5839                 NFSUNLOCKSTATE();
5840                 return (NFSERR_BADSESSION);
5841         }
5842
5843         /* Check to see if reclaim complete has already happened. */
5844         if ((sep->sess_clp->lc_flags & LCL_RECLAIMCOMPLETE) != 0)
5845                 error = NFSERR_COMPLETEALREADY;
5846         else
5847                 sep->sess_clp->lc_flags |= LCL_RECLAIMCOMPLETE;
5848         NFSUNLOCKSESSION(shp);
5849         NFSUNLOCKSTATE();
5850         return (error);
5851 }
5852
5853 /*
5854  * Cache the reply in a session slot.
5855  */
5856 void
5857 nfsrv_cache_session(uint8_t *sessionid, uint32_t slotid, int repstat,
5858    struct mbuf **m)
5859 {
5860         struct nfsdsession *sep;
5861         struct nfssessionhash *shp;
5862
5863         shp = NFSSESSIONHASH(sessionid);
5864         NFSLOCKSESSION(shp);
5865         sep = nfsrv_findsession(sessionid);
5866         if (sep == NULL) {
5867                 NFSUNLOCKSESSION(shp);
5868                 printf("nfsrv_cache_session: no session\n");
5869                 m_freem(*m);
5870                 return;
5871         }
5872         nfsv4_seqsess_cacherep(slotid, sep->sess_slots, repstat, m);
5873         NFSUNLOCKSESSION(shp);
5874 }
5875
5876 /*
5877  * Search for a session that matches the sessionid.
5878  */
5879 static struct nfsdsession *
5880 nfsrv_findsession(uint8_t *sessionid)
5881 {
5882         struct nfsdsession *sep;
5883         struct nfssessionhash *shp;
5884
5885         shp = NFSSESSIONHASH(sessionid);
5886         LIST_FOREACH(sep, &shp->list, sess_hash) {
5887                 if (!NFSBCMP(sessionid, sep->sess_sessionid, NFSX_V4SESSIONID))
5888                         break;
5889         }
5890         return (sep);
5891 }
5892
5893 /*
5894  * Destroy a session.
5895  */
5896 int
5897 nfsrv_destroysession(struct nfsrv_descript *nd, uint8_t *sessionid)
5898 {
5899         int error, samesess;
5900
5901         samesess = 0;
5902         if (!NFSBCMP(sessionid, nd->nd_sessionid, NFSX_V4SESSIONID)) {
5903                 samesess = 1;
5904                 if ((nd->nd_flag & ND_LASTOP) == 0)
5905                         return (NFSERR_BADSESSION);
5906         }
5907         error = nfsrv_freesession(NULL, sessionid);
5908         if (error == 0 && samesess != 0)
5909                 nd->nd_flag &= ~ND_HASSEQUENCE;
5910         return (error);
5911 }
5912
5913 /*
5914  * Free up a session structure.
5915  */
5916 static int
5917 nfsrv_freesession(struct nfsdsession *sep, uint8_t *sessionid)
5918 {
5919         struct nfssessionhash *shp;
5920         int i;
5921
5922         NFSLOCKSTATE();
5923         if (sep == NULL) {
5924                 shp = NFSSESSIONHASH(sessionid);
5925                 NFSLOCKSESSION(shp);
5926                 sep = nfsrv_findsession(sessionid);
5927         } else {
5928                 shp = NFSSESSIONHASH(sep->sess_sessionid);
5929                 NFSLOCKSESSION(shp);
5930         }
5931         if (sep != NULL) {
5932                 sep->sess_refcnt--;
5933                 if (sep->sess_refcnt > 0) {
5934                         NFSUNLOCKSESSION(shp);
5935                         NFSUNLOCKSTATE();
5936                         return (0);
5937                 }
5938                 LIST_REMOVE(sep, sess_hash);
5939                 LIST_REMOVE(sep, sess_list);
5940         }
5941         NFSUNLOCKSESSION(shp);
5942         NFSUNLOCKSTATE();
5943         if (sep == NULL)
5944                 return (NFSERR_BADSESSION);
5945         for (i = 0; i < NFSV4_SLOTS; i++)
5946                 if (sep->sess_slots[i].nfssl_reply != NULL)
5947                         m_freem(sep->sess_slots[i].nfssl_reply);
5948         if (sep->sess_cbsess.nfsess_xprt != NULL)
5949                 SVC_RELEASE(sep->sess_cbsess.nfsess_xprt);
5950         free(sep, M_NFSDSESSION);
5951         return (0);
5952 }
5953
5954 /*
5955  * Free a stateid.
5956  * RFC5661 says that it should fail when there are associated opens, locks
5957  * or delegations. Since stateids represent opens, I don't see how you can
5958  * free an open stateid (it will be free'd when closed), so this function
5959  * only works for lock stateids (freeing the lock_owner) or delegations.
5960  */
5961 int
5962 nfsrv_freestateid(struct nfsrv_descript *nd, nfsv4stateid_t *stateidp,
5963     NFSPROC_T *p)
5964 {
5965         struct nfsclient *clp;
5966         struct nfsstate *stp;
5967         int error;
5968
5969         NFSLOCKSTATE();
5970         /*
5971          * Look up the stateid
5972          */
5973         error = nfsrv_getclient((nfsquad_t)((u_quad_t)0), CLOPS_RENEW, &clp,
5974             NULL, (nfsquad_t)((u_quad_t)0), 0, nd, p);
5975         if (error == 0) {
5976                 /* First, check for a delegation. */
5977                 LIST_FOREACH(stp, &clp->lc_deleg, ls_list) {
5978                         if (!NFSBCMP(stp->ls_stateid.other, stateidp->other,
5979                             NFSX_STATEIDOTHER))
5980                                 break;
5981                 }
5982                 if (stp != NULL) {
5983                         nfsrv_freedeleg(stp);
5984                         NFSUNLOCKSTATE();
5985                         return (error);
5986                 }
5987         }
5988         /* Not a delegation, try for a lock_owner. */
5989         if (error == 0)
5990                 error = nfsrv_getstate(clp, stateidp, 0, &stp);
5991         if (error == 0 && ((stp->ls_flags & (NFSLCK_OPEN | NFSLCK_DELEGREAD |
5992             NFSLCK_DELEGWRITE)) != 0 || (stp->ls_flags & NFSLCK_LOCK) == 0))
5993                 /* Not a lock_owner stateid. */
5994                 error = NFSERR_LOCKSHELD;
5995         if (error == 0 && !LIST_EMPTY(&stp->ls_lock))
5996                 error = NFSERR_LOCKSHELD;
5997         if (error == 0)
5998                 nfsrv_freelockowner(stp, NULL, 0, p);
5999         NFSUNLOCKSTATE();
6000         return (error);
6001 }
6002
6003 /*
6004  * Generate the xdr for an NFSv4.1 CBSequence Operation.
6005  */
6006 static int
6007 nfsv4_setcbsequence(struct nfsrv_descript *nd, struct nfsclient *clp,
6008     int dont_replycache, struct nfsdsession **sepp)
6009 {
6010         struct nfsdsession *sep;
6011         uint32_t *tl, slotseq = 0;
6012         int maxslot, slotpos;
6013         uint8_t sessionid[NFSX_V4SESSIONID];
6014         int error;
6015
6016         error = nfsv4_getcbsession(clp, sepp);
6017         if (error != 0)
6018                 return (error);
6019         sep = *sepp;
6020         (void)nfsv4_sequencelookup(NULL, &sep->sess_cbsess, &slotpos, &maxslot,
6021             &slotseq, sessionid);
6022         KASSERT(maxslot >= 0, ("nfsv4_setcbsequence neg maxslot"));
6023
6024         /* Build the Sequence arguments. */
6025         NFSM_BUILD(tl, uint32_t *, NFSX_V4SESSIONID + 5 * NFSX_UNSIGNED);
6026         bcopy(sessionid, tl, NFSX_V4SESSIONID);
6027         tl += NFSX_V4SESSIONID / NFSX_UNSIGNED;
6028         nd->nd_slotseq = tl;
6029         *tl++ = txdr_unsigned(slotseq);
6030         *tl++ = txdr_unsigned(slotpos);
6031         *tl++ = txdr_unsigned(maxslot);
6032         if (dont_replycache == 0)
6033                 *tl++ = newnfs_true;
6034         else
6035                 *tl++ = newnfs_false;
6036         *tl = 0;                        /* No referring call list, for now. */
6037         nd->nd_flag |= ND_HASSEQUENCE;
6038         return (0);
6039 }
6040
6041 /*
6042  * Get a session for the callback.
6043  */
6044 static int
6045 nfsv4_getcbsession(struct nfsclient *clp, struct nfsdsession **sepp)
6046 {
6047         struct nfsdsession *sep;
6048
6049         NFSLOCKSTATE();
6050         LIST_FOREACH(sep, &clp->lc_session, sess_list) {
6051                 if ((sep->sess_crflags & NFSV4CRSESS_CONNBACKCHAN) != 0)
6052                         break;
6053         }
6054         if (sep == NULL) {
6055                 NFSUNLOCKSTATE();
6056                 return (NFSERR_BADSESSION);
6057         }
6058         sep->sess_refcnt++;
6059         *sepp = sep;
6060         NFSUNLOCKSTATE();
6061         return (0);
6062 }
6063
6064 /*
6065  * Free up all backchannel xprts.  This needs to be done when the nfsd threads
6066  * exit, since those transports will all be going away.
6067  * This is only called after all the nfsd threads are done performing RPCs,
6068  * so locking shouldn't be an issue.
6069  */
6070 APPLESTATIC void
6071 nfsrv_freeallbackchannel_xprts(void)
6072 {
6073         struct nfsdsession *sep;
6074         struct nfsclient *clp;
6075         SVCXPRT *xprt;
6076         int i;
6077
6078         for (i = 0; i < nfsrv_clienthashsize; i++) {
6079                 LIST_FOREACH(clp, &nfsclienthash[i], lc_hash) {
6080                         LIST_FOREACH(sep, &clp->lc_session, sess_list) {
6081                                 xprt = sep->sess_cbsess.nfsess_xprt;
6082                                 sep->sess_cbsess.nfsess_xprt = NULL;
6083                                 if (xprt != NULL)
6084                                         SVC_RELEASE(xprt);
6085                         }
6086                 }
6087         }
6088 }
6089