sys/fs/nfsclient/nfs_clstate.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2009 Rick Macklem, University of Guelph
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  */
  29
  30 #include <sys/cdefs.h>
  31 __FBSDID("$FreeBSD$");
  32
  33 /*
  34  * These functions implement the client side state handling for NFSv4.
  35  * NFSv4 state handling:
  36  * - A lockowner is used to determine lock contention, so it
  37  *   corresponds directly to a Posix pid. (1 to 1 mapping)
  38  * - The correct granularity of an OpenOwner is not nearly so
  39  *   obvious. An OpenOwner does the following:
  40  *   - provides a serial sequencing of Open/Close/Lock-with-new-lockowner
  41  *   - is used to check for Open/Share contention (not applicable to
  42  *     this client, since all Opens are Deny_None)
  43  *   As such, I considered both extreme.
  44  *   1 OpenOwner per ClientID - Simple to manage, but fully serializes
  45  *   all Open, Close and Lock (with a new lockowner) Ops.
  46  *   1 OpenOwner for each Open - This one results in an OpenConfirm for
  47  *   every Open, for most servers.
  48  *   So, I chose to use the same mapping as I did for LockOwnwers.
  49  *   The main concern here is that you can end up with multiple Opens
  50  *   for the same File Handle, but on different OpenOwners (opens
  51  *   inherited from parents, grandparents...) and you do not know
  52  *   which of these the vnodeop close applies to. This is handled by
  53  *   delaying the Close Op(s) until all of the Opens have been closed.
  54  *   (It is not yet obvious if this is the correct granularity.)
  55  * - How the code handles serialization:
  56  *   - For the ClientId, it uses an exclusive lock while getting its
  57  *     SetClientId and during recovery. Otherwise, it uses a shared
  58  *     lock via a reference count.
  59  *   - For the rest of the data structures, it uses an SMP mutex
  60  *     (once the nfs client is SMP safe) and doesn't sleep while
  61  *     manipulating the linked lists.
  62  *   - The serialization of Open/Close/Lock/LockU falls out in the
  63  *     "wash", since OpenOwners and LockOwners are both mapped from
  64  *     Posix pid. In other words, there is only one Posix pid using
  65  *     any given owner, so that owner is serialized. (If you change
  66  *     the granularity of the OpenOwner, then code must be added to
  67  *     serialize Ops on the OpenOwner.)
  68  * - When to get rid of OpenOwners and LockOwners.
  69  *   - The function nfscl_cleanup_common() is executed after a process exits.
  70  *     It goes through the client list looking for all Open and Lock Owners.
  71  *     When one is found, it is marked "defunct" or in the case of
  72  *     an OpenOwner without any Opens, freed.
  73  *     The renew thread scans for defunct Owners and gets rid of them,
  74  *     if it can. The LockOwners will also be deleted when the
  75  *     associated Open is closed.
  76  *   - If the LockU or Close Op(s) fail during close in a way
  77  *     that could be recovered upon retry, they are relinked to the
  78  *     ClientId's defunct open list and retried by the renew thread
  79  *     until they succeed or an unmount/recovery occurs.
  80  *     (Since we are done with them, they do not need to be recovered.)
  81  */
  82
  83 #include <fs/nfs/nfsport.h>
  84
  85 /*
  86  * Global variables
  87  */
  88 extern struct nfsstatsv1 nfsstatsv1;
  89 extern struct nfsreqhead nfsd_reqq;
  90 extern u_int32_t newnfs_false, newnfs_true;
  91 extern int nfscl_debuglevel;
  92 extern int nfscl_enablecallb;
  93 extern int nfs_numnfscbd;
  94 NFSREQSPINLOCK;
  95 NFSCLSTATEMUTEX;
  96 int nfscl_inited = 0;
  97 struct nfsclhead nfsclhead;     /* Head of clientid list */
  98 int nfscl_deleghighwater = NFSCLDELEGHIGHWATER;
  99 int nfscl_layouthighwater = NFSCLLAYOUTHIGHWATER;
 100
 101 static int nfscl_delegcnt = 0;
 102 static int nfscl_layoutcnt = 0;
 103 static int nfscl_getopen(struct nfsclownerhead *, u_int8_t *, int, u_int8_t *,
 104     u_int8_t *, u_int32_t, struct nfscllockowner **, struct nfsclopen **);
 105 static bool nfscl_checkown(struct nfsclowner *, struct nfsclopen *, uint8_t *,
 106     uint8_t *, struct nfscllockowner **, struct nfsclopen **,
 107     struct nfsclopen **);
 108 static void nfscl_clrelease(struct nfsclclient *);
 109 static void nfscl_cleanclient(struct nfsclclient *);
 110 static void nfscl_expireclient(struct nfsclclient *, struct nfsmount *,
 111     struct ucred *, NFSPROC_T *);
 112 static int nfscl_expireopen(struct nfsclclient *, struct nfsclopen *,
 113     struct nfsmount *, struct ucred *, NFSPROC_T *);
 114 static void nfscl_recover(struct nfsclclient *, bool *, struct ucred *,
 115     NFSPROC_T *);
 116 static void nfscl_insertlock(struct nfscllockowner *, struct nfscllock *,
 117     struct nfscllock *, int);
 118 static int nfscl_updatelock(struct nfscllockowner *, struct nfscllock **,
 119     struct nfscllock **, int);
 120 static void nfscl_delegreturnall(struct nfsclclient *, NFSPROC_T *);
 121 static u_int32_t nfscl_nextcbident(void);
 122 static mount_t nfscl_getmnt(int, uint8_t *, u_int32_t, struct nfsclclient **);
 123 static struct nfsclclient *nfscl_getclnt(u_int32_t);
 124 static struct nfsclclient *nfscl_getclntsess(uint8_t *);
 125 static struct nfscldeleg *nfscl_finddeleg(struct nfsclclient *, u_int8_t *,
 126     int);
 127 static void nfscl_retoncloselayout(vnode_t, struct nfsclclient *, uint8_t *,
 128     int, struct nfsclrecalllayout **);
 129 static void nfscl_reldevinfo_locked(struct nfscldevinfo *);
 130 static struct nfscllayout *nfscl_findlayout(struct nfsclclient *, u_int8_t *,
 131     int);
 132 static struct nfscldevinfo *nfscl_finddevinfo(struct nfsclclient *, uint8_t *);
 133 static int nfscl_checkconflict(struct nfscllockownerhead *, struct nfscllock *,
 134     u_int8_t *, struct nfscllock **);
 135 static void nfscl_freealllocks(struct nfscllockownerhead *, int);
 136 static int nfscl_localconflict(struct nfsclclient *, u_int8_t *, int,
 137     struct nfscllock *, u_int8_t *, struct nfscldeleg *, struct nfscllock **);
 138 static void nfscl_newopen(struct nfsclclient *, struct nfscldeleg *,
 139     struct nfsclowner **, struct nfsclowner **, struct nfsclopen **,
 140     struct nfsclopen **, u_int8_t *, u_int8_t *, int, struct ucred *, int *);
 141 static int nfscl_moveopen(vnode_t , struct nfsclclient *,
 142     struct nfsmount *, struct nfsclopen *, struct nfsclowner *,
 143     struct nfscldeleg *, struct ucred *, NFSPROC_T *);
 144 static void nfscl_totalrecall(struct nfsclclient *);
 145 static int nfscl_relock(vnode_t , struct nfsclclient *, struct nfsmount *,
 146     struct nfscllockowner *, struct nfscllock *, struct ucred *, NFSPROC_T *);
 147 static int nfscl_tryopen(struct nfsmount *, vnode_t , u_int8_t *, int,
 148     u_int8_t *, int, u_int32_t, struct nfsclopen *, u_int8_t *, int,
 149     struct nfscldeleg **, int, u_int32_t, struct ucred *, NFSPROC_T *);
 150 static int nfscl_trylock(struct nfsmount *, vnode_t , u_int8_t *,
 151     int, struct nfscllockowner *, int, int, u_int64_t, u_int64_t, short,
 152     struct ucred *, NFSPROC_T *);
 153 static int nfsrpc_reopen(struct nfsmount *, u_int8_t *, int, u_int32_t,
 154     struct nfsclopen *, struct nfscldeleg **, struct ucred *, NFSPROC_T *);
 155 static void nfscl_freedeleg(struct nfscldeleghead *, struct nfscldeleg *,
 156     bool);
 157 static int nfscl_errmap(struct nfsrv_descript *, u_int32_t);
 158 static void nfscl_cleanup_common(struct nfsclclient *, u_int8_t *);
 159 static int nfscl_recalldeleg(struct nfsclclient *, struct nfsmount *,
 160     struct nfscldeleg *, vnode_t, struct ucred *, NFSPROC_T *, int,
 161     vnode_t *);
 162 static void nfscl_freeopenowner(struct nfsclowner *, int);
 163 static void nfscl_cleandeleg(struct nfscldeleg *);
 164 static int nfscl_trydelegreturn(struct nfscldeleg *, struct ucred *,
 165     struct nfsmount *, NFSPROC_T *);
 166 static void nfscl_emptylockowner(struct nfscllockowner *,
 167     struct nfscllockownerfhhead *);
 168 static void nfscl_mergeflayouts(struct nfsclflayouthead *,
 169     struct nfsclflayouthead *);
 170 static int nfscl_layoutrecall(int, struct nfscllayout *, uint32_t, uint64_t,
 171     uint64_t, uint32_t, uint32_t, uint32_t, char *, struct nfsclrecalllayout *);
 172 static int nfscl_seq(uint32_t, uint32_t);
 173 static void nfscl_layoutreturn(struct nfsmount *, struct nfscllayout *,
 174     struct ucred *, NFSPROC_T *);
 175 static void nfscl_dolayoutcommit(struct nfsmount *, struct nfscllayout *,
 176     struct ucred *, NFSPROC_T *);
 177
 178 static short nfscberr_null[] = {
 179         0,
 180         0,
 181 };
 182
 183 static short nfscberr_getattr[] = {
 184         NFSERR_RESOURCE,
 185         NFSERR_BADHANDLE,
 186         NFSERR_BADXDR,
 187         NFSERR_RESOURCE,
 188         NFSERR_SERVERFAULT,
 189         0,
 190 };
 191
 192 static short nfscberr_recall[] = {
 193         NFSERR_RESOURCE,
 194         NFSERR_BADHANDLE,
 195         NFSERR_BADSTATEID,
 196         NFSERR_BADXDR,
 197         NFSERR_RESOURCE,
 198         NFSERR_SERVERFAULT,
 199         0,
 200 };
 201
 202 static short *nfscl_cberrmap[] = {
 203         nfscberr_null,
 204         nfscberr_null,
 205         nfscberr_null,
 206         nfscberr_getattr,
 207         nfscberr_recall
 208 };
 209
 210 #define NETFAMILY(clp) \
 211                 (((clp)->nfsc_flags & NFSCLFLAGS_AFINET6) ? AF_INET6 : AF_INET)
 212
 213 /*
 214  * Called for an open operation.
 215  * If the nfhp argument is NULL, just get an openowner.
 216  */
 217 int
 218 nfscl_open(vnode_t vp, u_int8_t *nfhp, int fhlen, u_int32_t amode, int usedeleg,
 219     struct ucred *cred, NFSPROC_T *p, struct nfsclowner **owpp,
 220     struct nfsclopen **opp, int *newonep, int *retp, int lockit)
 221 {
 222         struct nfsclclient *clp;
 223         struct nfsclowner *owp, *nowp;
 224         struct nfsclopen *op = NULL, *nop = NULL;
 225         struct nfscldeleg *dp;
 226         struct nfsclownerhead *ohp;
 227         u_int8_t own[NFSV4CL_LOCKNAMELEN];
 228         int ret;
 229
 230         if (newonep != NULL)
 231                 *newonep = 0;
 232         if (opp != NULL)
 233                 *opp = NULL;
 234         if (owpp != NULL)
 235                 *owpp = NULL;
 236
 237         /*
 238          * Might need one or both of these, so MALLOC them now, to
 239          * avoid a tsleep() in MALLOC later.
 240          */
 241         nowp = malloc(sizeof (struct nfsclowner),
 242             M_NFSCLOWNER, M_WAITOK);
 243         if (nfhp != NULL)
 244             nop = malloc(sizeof (struct nfsclopen) +
 245                 fhlen - 1, M_NFSCLOPEN, M_WAITOK);
 246         ret = nfscl_getcl(vp->v_mount, cred, p, 1, &clp);
 247         if (ret != 0) {
 248                 free(nowp, M_NFSCLOWNER);
 249                 if (nop != NULL)
 250                         free(nop, M_NFSCLOPEN);
 251                 return (ret);
 252         }
 253
 254         /*
 255          * Get the Open iff it already exists.
 256          * If none found, add the new one or return error, depending upon
 257          * "create".
 258          */
 259         NFSLOCKCLSTATE();
 260         dp = NULL;
 261         /* First check the delegation list */
 262         if (nfhp != NULL && usedeleg) {
 263                 LIST_FOREACH(dp, NFSCLDELEGHASH(clp, nfhp, fhlen), nfsdl_hash) {
 264                         if (dp->nfsdl_fhlen == fhlen &&
 265                             !NFSBCMP(nfhp, dp->nfsdl_fh, fhlen)) {
 266                                 if (!(amode & NFSV4OPEN_ACCESSWRITE) ||
 267                                     (dp->nfsdl_flags & NFSCLDL_WRITE))
 268                                         break;
 269                                 dp = NULL;
 270                                 break;
 271                         }
 272                 }
 273         }
 274
 275         /* For NFSv4.1/4.2 and this option, use a single open_owner. */
 276         if (NFSHASONEOPENOWN(VFSTONFS(vp->v_mount)))
 277                 nfscl_filllockowner(NULL, own, F_POSIX);
 278         else
 279                 nfscl_filllockowner(p->td_proc, own, F_POSIX);
 280         if (dp != NULL)
 281                 ohp = &dp->nfsdl_owner;
 282         else
 283                 ohp = &clp->nfsc_owner;
 284         /* Now, search for an openowner */
 285         LIST_FOREACH(owp, ohp, nfsow_list) {
 286                 if (!NFSBCMP(owp->nfsow_owner, own, NFSV4CL_LOCKNAMELEN))
 287                         break;
 288         }
 289
 290         /*
 291          * Create a new open, as required.
 292          */
 293         nfscl_newopen(clp, dp, &owp, &nowp, &op, &nop, own, nfhp, fhlen,
 294             cred, newonep);
 295
 296         /*
 297          * Now, check the mode on the open and return the appropriate
 298          * value.
 299          */
 300         if (retp != NULL) {
 301                 if (nfhp != NULL && dp != NULL && nop == NULL)
 302                         /* new local open on delegation */
 303                         *retp = NFSCLOPEN_SETCRED;
 304                 else
 305                         *retp = NFSCLOPEN_OK;
 306         }
 307         if (op != NULL && (amode & ~(op->nfso_mode))) {
 308                 op->nfso_mode |= amode;
 309                 if (retp != NULL && dp == NULL)
 310                         *retp = NFSCLOPEN_DOOPEN;
 311         }
 312
 313         /*
 314          * Serialize modifications to the open owner for multiple threads
 315          * within the same process using a read/write sleep lock.
 316          * For NFSv4.1 and a single OpenOwner, allow concurrent open operations
 317          * by acquiring a shared lock.  The close operations still use an
 318          * exclusive lock for this case.
 319          */
 320         if (lockit != 0) {
 321                 if (NFSHASONEOPENOWN(VFSTONFS(vp->v_mount))) {
 322                         /*
 323                          * Get a shared lock on the OpenOwner, but first
 324                          * wait for any pending exclusive lock, so that the
 325                          * exclusive locker gets priority.
 326                          */
 327                         nfsv4_lock(&owp->nfsow_rwlock, 0, NULL,
 328                             NFSCLSTATEMUTEXPTR, NULL);
 329                         nfsv4_getref(&owp->nfsow_rwlock, NULL,
 330                             NFSCLSTATEMUTEXPTR, NULL);
 331                 } else
 332                         nfscl_lockexcl(&owp->nfsow_rwlock, NFSCLSTATEMUTEXPTR);
 333         }
 334         NFSUNLOCKCLSTATE();
 335         if (nowp != NULL)
 336                 free(nowp, M_NFSCLOWNER);
 337         if (nop != NULL)
 338                 free(nop, M_NFSCLOPEN);
 339         if (owpp != NULL)
 340                 *owpp = owp;
 341         if (opp != NULL)
 342                 *opp = op;
 343         return (0);
 344 }
 345
 346 /*
 347  * Create a new open, as required.
 348  */
 349 static void
 350 nfscl_newopen(struct nfsclclient *clp, struct nfscldeleg *dp,
 351     struct nfsclowner **owpp, struct nfsclowner **nowpp, struct nfsclopen **opp,
 352     struct nfsclopen **nopp, u_int8_t *own, u_int8_t *fhp, int fhlen,
 353     struct ucred *cred, int *newonep)
 354 {
 355         struct nfsclowner *owp = *owpp, *nowp;
 356         struct nfsclopen *op, *nop;
 357
 358         if (nowpp != NULL)
 359                 nowp = *nowpp;
 360         else
 361                 nowp = NULL;
 362         if (nopp != NULL)
 363                 nop = *nopp;
 364         else
 365                 nop = NULL;
 366         if (owp == NULL && nowp != NULL) {
 367                 NFSBCOPY(own, nowp->nfsow_owner, NFSV4CL_LOCKNAMELEN);
 368                 LIST_INIT(&nowp->nfsow_open);
 369                 nowp->nfsow_clp = clp;
 370                 nowp->nfsow_seqid = 0;
 371                 nowp->nfsow_defunct = 0;
 372                 nfscl_lockinit(&nowp->nfsow_rwlock);
 373                 if (dp != NULL) {
 374                         nfsstatsv1.cllocalopenowners++;
 375                         LIST_INSERT_HEAD(&dp->nfsdl_owner, nowp, nfsow_list);
 376                 } else {
 377                         nfsstatsv1.clopenowners++;
 378                         LIST_INSERT_HEAD(&clp->nfsc_owner, nowp, nfsow_list);
 379                 }
 380                 owp = *owpp = nowp;
 381                 *nowpp = NULL;
 382                 if (newonep != NULL)
 383                         *newonep = 1;
 384         }
 385
 386          /* If an fhp has been specified, create an Open as well. */
 387         if (fhp != NULL) {
 388                 /* and look for the correct open, based upon FH */
 389                 LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 390                         if (op->nfso_fhlen == fhlen &&
 391                             !NFSBCMP(op->nfso_fh, fhp, fhlen))
 392                                 break;
 393                 }
 394                 if (op == NULL && nop != NULL) {
 395                         nop->nfso_own = owp;
 396                         nop->nfso_mode = 0;
 397                         nop->nfso_opencnt = 0;
 398                         nop->nfso_posixlock = 1;
 399                         nop->nfso_fhlen = fhlen;
 400                         NFSBCOPY(fhp, nop->nfso_fh, fhlen);
 401                         LIST_INIT(&nop->nfso_lock);
 402                         nop->nfso_stateid.seqid = 0;
 403                         nop->nfso_stateid.other[0] = 0;
 404                         nop->nfso_stateid.other[1] = 0;
 405                         nop->nfso_stateid.other[2] = 0;
 406                         KASSERT(cred != NULL, ("%s: cred NULL\n", __func__));
 407                         newnfs_copyincred(cred, &nop->nfso_cred);
 408                         if (dp != NULL) {
 409                                 TAILQ_REMOVE(&clp->nfsc_deleg, dp, nfsdl_list);
 410                                 TAILQ_INSERT_HEAD(&clp->nfsc_deleg, dp,
 411                                     nfsdl_list);
 412                                 dp->nfsdl_timestamp = NFSD_MONOSEC + 120;
 413                                 nfsstatsv1.cllocalopens++;
 414                         } else {
 415                                 nfsstatsv1.clopens++;
 416                         }
 417                         LIST_INSERT_HEAD(&owp->nfsow_open, nop, nfso_list);
 418                         *opp = nop;
 419                         *nopp = NULL;
 420                         if (newonep != NULL)
 421                                 *newonep = 1;
 422                 } else {
 423                         *opp = op;
 424                 }
 425         }
 426 }
 427
 428 /*
 429  * Called to find/add a delegation to a client.
 430  */
 431 int
 432 nfscl_deleg(mount_t mp, struct nfsclclient *clp, u_int8_t *nfhp,
 433     int fhlen, struct ucred *cred, NFSPROC_T *p, struct nfscldeleg **dpp)
 434 {
 435         struct nfscldeleg *dp = *dpp, *tdp;
 436
 437         /*
 438          * First, if we have received a Read delegation for a file on a
 439          * read/write file system, just return it, because they aren't
 440          * useful, imho.
 441          */
 442         if (mp != NULL && dp != NULL && !NFSMNT_RDONLY(mp) &&
 443             (dp->nfsdl_flags & NFSCLDL_READ)) {
 444                 (void) nfscl_trydelegreturn(dp, cred, VFSTONFS(mp), p);
 445                 free(dp, M_NFSCLDELEG);
 446                 *dpp = NULL;
 447                 return (0);
 448         }
 449
 450         /* Look for the correct deleg, based upon FH */
 451         NFSLOCKCLSTATE();
 452         tdp = nfscl_finddeleg(clp, nfhp, fhlen);
 453         if (tdp == NULL) {
 454                 if (dp == NULL) {
 455                         NFSUNLOCKCLSTATE();
 456                         return (NFSERR_BADSTATEID);
 457                 }
 458                 *dpp = NULL;
 459                 TAILQ_INSERT_HEAD(&clp->nfsc_deleg, dp, nfsdl_list);
 460                 LIST_INSERT_HEAD(NFSCLDELEGHASH(clp, nfhp, fhlen), dp,
 461                     nfsdl_hash);
 462                 dp->nfsdl_timestamp = NFSD_MONOSEC + 120;
 463                 nfsstatsv1.cldelegates++;
 464                 nfscl_delegcnt++;
 465         } else {
 466                 /*
 467                  * Delegation already exists, what do we do if a new one??
 468                  */
 469                 if (dp != NULL) {
 470                         printf("Deleg already exists!\n");
 471                         free(dp, M_NFSCLDELEG);
 472                         *dpp = NULL;
 473                 } else {
 474                         *dpp = tdp;
 475                 }
 476         }
 477         NFSUNLOCKCLSTATE();
 478         return (0);
 479 }
 480
 481 /*
 482  * Find a delegation for this file handle. Return NULL upon failure.
 483  */
 484 static struct nfscldeleg *
 485 nfscl_finddeleg(struct nfsclclient *clp, u_int8_t *fhp, int fhlen)
 486 {
 487         struct nfscldeleg *dp;
 488
 489         LIST_FOREACH(dp, NFSCLDELEGHASH(clp, fhp, fhlen), nfsdl_hash) {
 490             if (dp->nfsdl_fhlen == fhlen &&
 491                 !NFSBCMP(dp->nfsdl_fh, fhp, fhlen))
 492                 break;
 493         }
 494         return (dp);
 495 }
 496
 497 /*
 498  * Get a stateid for an I/O operation. First, look for an open and iff
 499  * found, return either a lockowner stateid or the open stateid.
 500  * If no Open is found, just return error and the special stateid of all zeros.
 501  */
 502 int
 503 nfscl_getstateid(vnode_t vp, u_int8_t *nfhp, int fhlen, u_int32_t mode,
 504     int fords, struct ucred *cred, NFSPROC_T *p, nfsv4stateid_t *stateidp,
 505     void **lckpp)
 506 {
 507         struct nfsclclient *clp;
 508         struct nfsclowner *owp;
 509         struct nfsclopen *op = NULL, *top;
 510         struct nfscllockowner *lp;
 511         struct nfscldeleg *dp;
 512         struct nfsnode *np;
 513         struct nfsmount *nmp;
 514         u_int8_t own[NFSV4CL_LOCKNAMELEN];
 515         int error;
 516         bool done;
 517
 518         *lckpp = NULL;
 519         /*
 520          * Initially, just set the special stateid of all zeros.
 521          * (Don't do this for a DS, since the special stateid can't be used.)
 522          */
 523         if (fords == 0) {
 524                 stateidp->seqid = 0;
 525                 stateidp->other[0] = 0;
 526                 stateidp->other[1] = 0;
 527                 stateidp->other[2] = 0;
 528         }
 529         if (vnode_vtype(vp) != VREG)
 530                 return (EISDIR);
 531         np = VTONFS(vp);
 532         nmp = VFSTONFS(vp->v_mount);
 533         NFSLOCKCLSTATE();
 534         clp = nfscl_findcl(nmp);
 535         if (clp == NULL) {
 536                 NFSUNLOCKCLSTATE();
 537                 return (EACCES);
 538         }
 539
 540         /*
 541          * Wait for recovery to complete.
 542          */
 543         while ((clp->nfsc_flags & NFSCLFLAGS_RECVRINPROG))
 544                 (void) nfsmsleep(&clp->nfsc_flags, NFSCLSTATEMUTEXPTR,
 545                     PZERO, "nfsrecvr", NULL);
 546
 547         /*
 548          * First, look for a delegation.
 549          */
 550         LIST_FOREACH(dp, NFSCLDELEGHASH(clp, nfhp, fhlen), nfsdl_hash) {
 551                 if (dp->nfsdl_fhlen == fhlen &&
 552                     !NFSBCMP(nfhp, dp->nfsdl_fh, fhlen)) {
 553                         if (!(mode & NFSV4OPEN_ACCESSWRITE) ||
 554                             (dp->nfsdl_flags & NFSCLDL_WRITE)) {
 555                                 stateidp->seqid = dp->nfsdl_stateid.seqid;
 556                                 stateidp->other[0] = dp->nfsdl_stateid.other[0];
 557                                 stateidp->other[1] = dp->nfsdl_stateid.other[1];
 558                                 stateidp->other[2] = dp->nfsdl_stateid.other[2];
 559                                 if (!(np->n_flag & NDELEGRECALL)) {
 560                                         TAILQ_REMOVE(&clp->nfsc_deleg, dp,
 561                                             nfsdl_list);
 562                                         TAILQ_INSERT_HEAD(&clp->nfsc_deleg, dp,
 563                                             nfsdl_list);
 564                                         dp->nfsdl_timestamp = NFSD_MONOSEC +
 565                                             120;
 566                                         dp->nfsdl_rwlock.nfslock_usecnt++;
 567                                         *lckpp = (void *)&dp->nfsdl_rwlock;
 568                                 }
 569                                 NFSUNLOCKCLSTATE();
 570                                 return (0);
 571                         }
 572                         break;
 573                 }
 574         }
 575
 576         if (p != NULL) {
 577                 /*
 578                  * If p != NULL, we want to search the parentage tree
 579                  * for a matching OpenOwner and use that.
 580                  */
 581                 if (NFSHASONEOPENOWN(VFSTONFS(vp->v_mount)))
 582                         nfscl_filllockowner(NULL, own, F_POSIX);
 583                 else
 584                         nfscl_filllockowner(p->td_proc, own, F_POSIX);
 585                 lp = NULL;
 586                 error = nfscl_getopen(&clp->nfsc_owner, nfhp, fhlen, own, own,
 587                     mode, &lp, &op);
 588                 if (error == 0 && lp != NULL && fords == 0) {
 589                         /* Don't return a lock stateid for a DS. */
 590                         stateidp->seqid =
 591                             lp->nfsl_stateid.seqid;
 592                         stateidp->other[0] =
 593                             lp->nfsl_stateid.other[0];
 594                         stateidp->other[1] =
 595                             lp->nfsl_stateid.other[1];
 596                         stateidp->other[2] =
 597                             lp->nfsl_stateid.other[2];
 598                         NFSUNLOCKCLSTATE();
 599                         return (0);
 600                 }
 601         }
 602         if (op == NULL) {
 603                 /* If not found, just look for any OpenOwner that will work. */
 604                 top = NULL;
 605                 done = false;
 606                 LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 607                         LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 608                                 if (op->nfso_fhlen == fhlen &&
 609                                     !NFSBCMP(op->nfso_fh, nfhp, fhlen)) {
 610                                         if (top == NULL && (op->nfso_mode &
 611                                             NFSV4OPEN_ACCESSWRITE) != 0 &&
 612                                             (mode & NFSV4OPEN_ACCESSREAD) != 0)
 613                                                 top = op;
 614                                         if ((mode & op->nfso_mode) == mode) {
 615                                                 done = true;
 616                                                 break;
 617                                         }
 618                                 }
 619                         }
 620                         if (done)
 621                                 break;
 622                 }
 623                 if (!done) {
 624                         NFSCL_DEBUG(2, "openmode top=%p\n", top);
 625                         if (top == NULL || NFSHASOPENMODE(nmp)) {
 626                                 NFSUNLOCKCLSTATE();
 627                                 return (ENOENT);
 628                         } else
 629                                 op = top;
 630                 }
 631                 /*
 632                  * For read aheads or write behinds, use the open cred.
 633                  * A read ahead or write behind is indicated by p == NULL.
 634                  */
 635                 if (p == NULL)
 636                         newnfs_copycred(&op->nfso_cred, cred);
 637         }
 638
 639         /*
 640          * No lock stateid, so return the open stateid.
 641          */
 642         stateidp->seqid = op->nfso_stateid.seqid;
 643         stateidp->other[0] = op->nfso_stateid.other[0];
 644         stateidp->other[1] = op->nfso_stateid.other[1];
 645         stateidp->other[2] = op->nfso_stateid.other[2];
 646         NFSUNLOCKCLSTATE();
 647         return (0);
 648 }
 649
 650 /*
 651  * Search for a matching file, mode and, optionally, lockowner.
 652  */
 653 static int
 654 nfscl_getopen(struct nfsclownerhead *ohp, u_int8_t *nfhp, int fhlen,
 655     u_int8_t *openown, u_int8_t *lockown, u_int32_t mode,
 656     struct nfscllockowner **lpp, struct nfsclopen **opp)
 657 {
 658         struct nfsclowner *owp;
 659         struct nfsclopen *op, *rop, *rop2;
 660         bool keep_looping;
 661
 662         if (lpp != NULL)
 663                 *lpp = NULL;
 664         /*
 665          * rop will be set to the open to be returned. There are three
 666          * variants of this, all for an open of the correct file:
 667          * 1 - A match of lockown.
 668          * 2 - A match of the openown, when no lockown match exists.
 669          * 3 - A match for any open, if no openown or lockown match exists.
 670          * Looking for #2 over #3 probably isn't necessary, but since
 671          * RFC3530 is vague w.r.t. the relationship between openowners and
 672          * lockowners, I think this is the safer way to go.
 673          */
 674         rop = NULL;
 675         rop2 = NULL;
 676         keep_looping = true;
 677         /* Search the client list */
 678         LIST_FOREACH(owp, ohp, nfsow_list) {
 679                 /* and look for the correct open */
 680                 LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 681                         if (op->nfso_fhlen == fhlen &&
 682                             !NFSBCMP(op->nfso_fh, nfhp, fhlen)
 683                             && (op->nfso_mode & mode) == mode)
 684                                 keep_looping = nfscl_checkown(owp, op, openown,
 685                                     lockown, lpp, &rop, &rop2);
 686                         if (!keep_looping)
 687                                 break;
 688                 }
 689                 if (!keep_looping)
 690                         break;
 691         }
 692         if (rop == NULL)
 693                 rop = rop2;
 694         if (rop == NULL)
 695                 return (EBADF);
 696         *opp = rop;
 697         return (0);
 698 }
 699
 700 /* Check for an owner match. */
 701 static bool
 702 nfscl_checkown(struct nfsclowner *owp, struct nfsclopen *op, uint8_t *openown,
 703     uint8_t *lockown, struct nfscllockowner **lpp, struct nfsclopen **ropp,
 704     struct nfsclopen **ropp2)
 705 {
 706         struct nfscllockowner *lp;
 707         bool keep_looping;
 708
 709         keep_looping = true;
 710         if (lpp != NULL) {
 711                 /* Now look for a matching lockowner. */
 712                 LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
 713                         if (!NFSBCMP(lp->nfsl_owner, lockown,
 714                             NFSV4CL_LOCKNAMELEN)) {
 715                                 *lpp = lp;
 716                                 *ropp = op;
 717                                 return (false);
 718                         }
 719                 }
 720         }
 721         if (*ropp == NULL && !NFSBCMP(owp->nfsow_owner, openown,
 722             NFSV4CL_LOCKNAMELEN)) {
 723                 *ropp = op;
 724                 if (lpp == NULL)
 725                         keep_looping = false;
 726         }
 727         if (*ropp2 == NULL)
 728                 *ropp2 = op;
 729         return (keep_looping);
 730 }
 731
 732 /*
 733  * Release use of an open owner. Called when open operations are done
 734  * with the open owner.
 735  */
 736 void
 737 nfscl_ownerrelease(struct nfsmount *nmp, struct nfsclowner *owp,
 738     __unused int error, __unused int candelete, int unlocked)
 739 {
 740
 741         if (owp == NULL)
 742                 return;
 743         NFSLOCKCLSTATE();
 744         if (unlocked == 0) {
 745                 if (NFSHASONEOPENOWN(nmp))
 746                         nfsv4_relref(&owp->nfsow_rwlock);
 747                 else
 748                         nfscl_lockunlock(&owp->nfsow_rwlock);
 749         }
 750         nfscl_clrelease(owp->nfsow_clp);
 751         NFSUNLOCKCLSTATE();
 752 }
 753
 754 /*
 755  * Release use of an open structure under an open owner.
 756  */
 757 void
 758 nfscl_openrelease(struct nfsmount *nmp, struct nfsclopen *op, int error,
 759     int candelete)
 760 {
 761         struct nfsclclient *clp;
 762         struct nfsclowner *owp;
 763
 764         if (op == NULL)
 765                 return;
 766         NFSLOCKCLSTATE();
 767         owp = op->nfso_own;
 768         if (NFSHASONEOPENOWN(nmp))
 769                 nfsv4_relref(&owp->nfsow_rwlock);
 770         else
 771                 nfscl_lockunlock(&owp->nfsow_rwlock);
 772         clp = owp->nfsow_clp;
 773         if (error && candelete && op->nfso_opencnt == 0)
 774                 nfscl_freeopen(op, 0);
 775         nfscl_clrelease(clp);
 776         NFSUNLOCKCLSTATE();
 777 }
 778
 779 /*
 780  * Called to get a clientid structure. It will optionally lock the
 781  * client data structures to do the SetClientId/SetClientId_confirm,
 782  * but will release that lock and return the clientid with a reference
 783  * count on it.
 784  * If the "cred" argument is NULL, a new clientid should not be created.
 785  * If the "p" argument is NULL, a SetClientID/SetClientIDConfirm cannot
 786  * be done.
 787  * The start_renewthread argument tells nfscl_getcl() to start a renew
 788  * thread if this creates a new clp.
 789  * It always clpp with a reference count on it, unless returning an error.
 790  */
 791 int
 792 nfscl_getcl(struct mount *mp, struct ucred *cred, NFSPROC_T *p,
 793     int start_renewthread, struct nfsclclient **clpp)
 794 {
 795         struct nfsclclient *clp;
 796         struct nfsclclient *newclp = NULL;
 797         struct nfsmount *nmp;
 798         char uuid[HOSTUUIDLEN];
 799         int igotlock = 0, error, trystalecnt, clidinusedelay, i;
 800         u_int16_t idlen = 0;
 801
 802         nmp = VFSTONFS(mp);
 803         if (cred != NULL) {
 804                 getcredhostuuid(cred, uuid, sizeof uuid);
 805                 idlen = strlen(uuid);
 806                 if (idlen > 0)
 807                         idlen += sizeof (u_int64_t);
 808                 else
 809                         idlen += sizeof (u_int64_t) + 16; /* 16 random bytes */
 810                 newclp = malloc(
 811                     sizeof (struct nfsclclient) + idlen - 1, M_NFSCLCLIENT,
 812                     M_WAITOK | M_ZERO);
 813         }
 814         NFSLOCKCLSTATE();
 815         /*
 816          * If a forced dismount is already in progress, don't
 817          * allocate a new clientid and get out now. For the case where
 818          * clp != NULL, this is a harmless optimization.
 819          */
 820         if (NFSCL_FORCEDISM(mp)) {
 821                 NFSUNLOCKCLSTATE();
 822                 if (newclp != NULL)
 823                         free(newclp, M_NFSCLCLIENT);
 824                 return (EBADF);
 825         }
 826         clp = nmp->nm_clp;
 827         if (clp == NULL) {
 828                 if (newclp == NULL) {
 829                         NFSUNLOCKCLSTATE();
 830                         return (EACCES);
 831                 }
 832                 clp = newclp;
 833                 clp->nfsc_idlen = idlen;
 834                 LIST_INIT(&clp->nfsc_owner);
 835                 TAILQ_INIT(&clp->nfsc_deleg);
 836                 TAILQ_INIT(&clp->nfsc_layout);
 837                 LIST_INIT(&clp->nfsc_devinfo);
 838                 for (i = 0; i < NFSCLDELEGHASHSIZE; i++)
 839                         LIST_INIT(&clp->nfsc_deleghash[i]);
 840                 for (i = 0; i < NFSCLLAYOUTHASHSIZE; i++)
 841                         LIST_INIT(&clp->nfsc_layouthash[i]);
 842                 clp->nfsc_flags = NFSCLFLAGS_INITED;
 843                 clp->nfsc_clientidrev = 1;
 844                 clp->nfsc_cbident = nfscl_nextcbident();
 845                 nfscl_fillclid(nmp->nm_clval, uuid, clp->nfsc_id,
 846                     clp->nfsc_idlen);
 847                 LIST_INSERT_HEAD(&nfsclhead, clp, nfsc_list);
 848                 nmp->nm_clp = clp;
 849                 clp->nfsc_nmp = nmp;
 850                 NFSUNLOCKCLSTATE();
 851                 if (start_renewthread != 0)
 852                         nfscl_start_renewthread(clp);
 853         } else {
 854                 NFSUNLOCKCLSTATE();
 855                 if (newclp != NULL)
 856                         free(newclp, M_NFSCLCLIENT);
 857         }
 858         NFSLOCKCLSTATE();
 859         while ((clp->nfsc_flags & NFSCLFLAGS_HASCLIENTID) == 0 && !igotlock &&
 860             !NFSCL_FORCEDISM(mp))
 861                 igotlock = nfsv4_lock(&clp->nfsc_lock, 1, NULL,
 862                     NFSCLSTATEMUTEXPTR, mp);
 863         if (igotlock == 0) {
 864                 /*
 865                  * Call nfsv4_lock() with "iwantlock == 0" so that it will
 866                  * wait for a pending exclusive lock request.  This gives the
 867                  * exclusive lock request priority over this shared lock
 868                  * request.
 869                  * An exclusive lock on nfsc_lock is used mainly for server
 870                  * crash recoveries.
 871                  */
 872                 nfsv4_lock(&clp->nfsc_lock, 0, NULL, NFSCLSTATEMUTEXPTR, mp);
 873                 nfsv4_getref(&clp->nfsc_lock, NULL, NFSCLSTATEMUTEXPTR, mp);
 874         }
 875         if (igotlock == 0 && NFSCL_FORCEDISM(mp)) {
 876                 /*
 877                  * Both nfsv4_lock() and nfsv4_getref() know to check
 878                  * for NFSCL_FORCEDISM() and return without sleeping to
 879                  * wait for the exclusive lock to be released, since it
 880                  * might be held by nfscl_umount() and we need to get out
 881                  * now for that case and not wait until nfscl_umount()
 882                  * releases it.
 883                  */
 884                 NFSUNLOCKCLSTATE();
 885                 return (EBADF);
 886         }
 887         NFSUNLOCKCLSTATE();
 888
 889         /*
 890          * If it needs a clientid, do the setclientid now.
 891          */
 892         if ((clp->nfsc_flags & NFSCLFLAGS_HASCLIENTID) == 0) {
 893                 if (!igotlock)
 894                         panic("nfscl_clget");
 895                 if (p == NULL || cred == NULL) {
 896                         NFSLOCKCLSTATE();
 897                         nfsv4_unlock(&clp->nfsc_lock, 0);
 898                         NFSUNLOCKCLSTATE();
 899                         return (EACCES);
 900                 }
 901                 /*
 902                  * If RFC3530 Sec. 14.2.33 is taken literally,
 903                  * NFSERR_CLIDINUSE will be returned persistently for the
 904                  * case where a new mount of the same file system is using
 905                  * a different principal. In practice, NFSERR_CLIDINUSE is
 906                  * only returned when there is outstanding unexpired state
 907                  * on the clientid. As such, try for twice the lease
 908                  * interval, if we know what that is. Otherwise, make a
 909                  * wild ass guess.
 910                  * The case of returning NFSERR_STALECLIENTID is far less
 911                  * likely, but might occur if there is a significant delay
 912                  * between doing the SetClientID and SetClientIDConfirm Ops,
 913                  * such that the server throws away the clientid before
 914                  * receiving the SetClientIDConfirm.
 915                  */
 916                 if (clp->nfsc_renew > 0)
 917                         clidinusedelay = NFSCL_LEASE(clp->nfsc_renew) * 2;
 918                 else
 919                         clidinusedelay = 120;
 920                 trystalecnt = 3;
 921                 do {
 922                         error = nfsrpc_setclient(nmp, clp, 0, NULL, cred, p);
 923                         if (error == NFSERR_STALECLIENTID ||
 924                             error == NFSERR_STALEDONTRECOVER ||
 925                             error == NFSERR_BADSESSION ||
 926                             error == NFSERR_CLIDINUSE) {
 927                                 (void) nfs_catnap(PZERO, error, "nfs_setcl");
 928                         }
 929                 } while (((error == NFSERR_STALECLIENTID ||
 930                      error == NFSERR_BADSESSION ||
 931                      error == NFSERR_STALEDONTRECOVER) && --trystalecnt > 0) ||
 932                     (error == NFSERR_CLIDINUSE && --clidinusedelay > 0));
 933                 if (error) {
 934                         NFSLOCKCLSTATE();
 935                         nfsv4_unlock(&clp->nfsc_lock, 0);
 936                         NFSUNLOCKCLSTATE();
 937                         return (error);
 938                 }
 939                 clp->nfsc_flags |= NFSCLFLAGS_HASCLIENTID;
 940         }
 941         if (igotlock) {
 942                 NFSLOCKCLSTATE();
 943                 nfsv4_unlock(&clp->nfsc_lock, 1);
 944                 NFSUNLOCKCLSTATE();
 945         }
 946
 947         *clpp = clp;
 948         return (0);
 949 }
 950
 951 /*
 952  * Get a reference to a clientid and return it, if valid.
 953  */
 954 struct nfsclclient *
 955 nfscl_findcl(struct nfsmount *nmp)
 956 {
 957         struct nfsclclient *clp;
 958
 959         clp = nmp->nm_clp;
 960         if (clp == NULL || !(clp->nfsc_flags & NFSCLFLAGS_HASCLIENTID))
 961                 return (NULL);
 962         return (clp);
 963 }
 964
 965 /*
 966  * Release the clientid structure. It may be locked or reference counted.
 967  */
 968 static void
 969 nfscl_clrelease(struct nfsclclient *clp)
 970 {
 971
 972         if (clp->nfsc_lock.nfslock_lock & NFSV4LOCK_LOCK)
 973                 nfsv4_unlock(&clp->nfsc_lock, 0);
 974         else
 975                 nfsv4_relref(&clp->nfsc_lock);
 976 }
 977
 978 /*
 979  * External call for nfscl_clrelease.
 980  */
 981 void
 982 nfscl_clientrelease(struct nfsclclient *clp)
 983 {
 984
 985         NFSLOCKCLSTATE();
 986         if (clp->nfsc_lock.nfslock_lock & NFSV4LOCK_LOCK)
 987                 nfsv4_unlock(&clp->nfsc_lock, 0);
 988         else
 989                 nfsv4_relref(&clp->nfsc_lock);
 990         NFSUNLOCKCLSTATE();
 991 }
 992
 993 /*
 994  * Called when wanting to lock a byte region.
 995  */
 996 int
 997 nfscl_getbytelock(vnode_t vp, u_int64_t off, u_int64_t len,
 998     short type, struct ucred *cred, NFSPROC_T *p, struct nfsclclient *rclp,
 999     int recovery, void *id, int flags, u_int8_t *rownp, u_int8_t *ropenownp,
1000     struct nfscllockowner **lpp, int *newonep, int *donelocallyp)
1001 {
1002         struct nfscllockowner *lp;
1003         struct nfsclopen *op;
1004         struct nfsclclient *clp;
1005         struct nfscllockowner *nlp;
1006         struct nfscllock *nlop, *otherlop;
1007         struct nfscldeleg *dp = NULL, *ldp = NULL;
1008         struct nfscllockownerhead *lhp = NULL;
1009         struct nfsnode *np;
1010         u_int8_t own[NFSV4CL_LOCKNAMELEN], *ownp, openown[NFSV4CL_LOCKNAMELEN];
1011         u_int8_t *openownp;
1012         int error = 0, ret, donelocally = 0;
1013         u_int32_t mode;
1014
1015         /* For Lock Ops, the open mode doesn't matter, so use 0 to match any. */
1016         mode = 0;
1017         np = VTONFS(vp);
1018         *lpp = NULL;
1019         lp = NULL;
1020         *newonep = 0;
1021         *donelocallyp = 0;
1022
1023         /*
1024          * Might need these, so MALLOC them now, to
1025          * avoid a tsleep() in MALLOC later.
1026          */
1027         nlp = malloc(
1028             sizeof (struct nfscllockowner), M_NFSCLLOCKOWNER, M_WAITOK);
1029         otherlop = malloc(
1030             sizeof (struct nfscllock), M_NFSCLLOCK, M_WAITOK);
1031         nlop = malloc(
1032             sizeof (struct nfscllock), M_NFSCLLOCK, M_WAITOK);
1033         nlop->nfslo_type = type;
1034         nlop->nfslo_first = off;
1035         if (len == NFS64BITSSET) {
1036                 nlop->nfslo_end = NFS64BITSSET;
1037         } else {
1038                 nlop->nfslo_end = off + len;
1039                 if (nlop->nfslo_end <= nlop->nfslo_first)
1040                         error = NFSERR_INVAL;
1041         }
1042
1043         if (!error) {
1044                 if (recovery)
1045                         clp = rclp;
1046                 else
1047                         error = nfscl_getcl(vp->v_mount, cred, p, 1, &clp);
1048         }
1049         if (error) {
1050                 free(nlp, M_NFSCLLOCKOWNER);
1051                 free(otherlop, M_NFSCLLOCK);
1052                 free(nlop, M_NFSCLLOCK);
1053                 return (error);
1054         }
1055
1056         op = NULL;
1057         if (recovery) {
1058                 ownp = rownp;
1059                 openownp = ropenownp;
1060         } else {
1061                 nfscl_filllockowner(id, own, flags);
1062                 ownp = own;
1063                 if (NFSHASONEOPENOWN(VFSTONFS(vp->v_mount)))
1064                         nfscl_filllockowner(NULL, openown, F_POSIX);
1065                 else
1066                         nfscl_filllockowner(p->td_proc, openown, F_POSIX);
1067                 openownp = openown;
1068         }
1069         if (!recovery) {
1070                 NFSLOCKCLSTATE();
1071                 /*
1072                  * First, search for a delegation. If one exists for this file,
1073                  * the lock can be done locally against it, so long as there
1074                  * isn't a local lock conflict.
1075                  */
1076                 ldp = dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh,
1077                     np->n_fhp->nfh_len);
1078                 /* Just sanity check for correct type of delegation */
1079                 if (dp != NULL && ((dp->nfsdl_flags &
1080                     (NFSCLDL_RECALL | NFSCLDL_DELEGRET)) != 0 ||
1081                      (type == F_WRLCK &&
1082                       (dp->nfsdl_flags & NFSCLDL_WRITE) == 0)))
1083                         dp = NULL;
1084         }
1085         if (dp != NULL) {
1086                 /* Now, find an open and maybe a lockowner. */
1087                 ret = nfscl_getopen(&dp->nfsdl_owner, np->n_fhp->nfh_fh,
1088                     np->n_fhp->nfh_len, openownp, ownp, mode, NULL, &op);
1089                 if (ret)
1090                         ret = nfscl_getopen(&clp->nfsc_owner,
1091                             np->n_fhp->nfh_fh, np->n_fhp->nfh_len, openownp,
1092                             ownp, mode, NULL, &op);
1093                 if (!ret) {
1094                         lhp = &dp->nfsdl_lock;
1095                         TAILQ_REMOVE(&clp->nfsc_deleg, dp, nfsdl_list);
1096                         TAILQ_INSERT_HEAD(&clp->nfsc_deleg, dp, nfsdl_list);
1097                         dp->nfsdl_timestamp = NFSD_MONOSEC + 120;
1098                         donelocally = 1;
1099                 } else {
1100                         dp = NULL;
1101                 }
1102         }
1103         if (!donelocally) {
1104                 /*
1105                  * Get the related Open and maybe lockowner.
1106                  */
1107                 error = nfscl_getopen(&clp->nfsc_owner,
1108                     np->n_fhp->nfh_fh, np->n_fhp->nfh_len, openownp,
1109                     ownp, mode, &lp, &op);
1110                 if (!error)
1111                         lhp = &op->nfso_lock;
1112         }
1113         if (!error && !recovery)
1114                 error = nfscl_localconflict(clp, np->n_fhp->nfh_fh,
1115                     np->n_fhp->nfh_len, nlop, ownp, ldp, NULL);
1116         if (error) {
1117                 if (!recovery) {
1118                         nfscl_clrelease(clp);
1119                         NFSUNLOCKCLSTATE();
1120                 }
1121                 free(nlp, M_NFSCLLOCKOWNER);
1122                 free(otherlop, M_NFSCLLOCK);
1123                 free(nlop, M_NFSCLLOCK);
1124                 return (error);
1125         }
1126
1127         /*
1128          * Ok, see if a lockowner exists and create one, as required.
1129          */
1130         if (lp == NULL)
1131                 LIST_FOREACH(lp, lhp, nfsl_list) {
1132                         if (!NFSBCMP(lp->nfsl_owner, ownp, NFSV4CL_LOCKNAMELEN))
1133                                 break;
1134                 }
1135         if (lp == NULL) {
1136                 NFSBCOPY(ownp, nlp->nfsl_owner, NFSV4CL_LOCKNAMELEN);
1137                 if (recovery)
1138                         NFSBCOPY(ropenownp, nlp->nfsl_openowner,
1139                             NFSV4CL_LOCKNAMELEN);
1140                 else
1141                         NFSBCOPY(op->nfso_own->nfsow_owner, nlp->nfsl_openowner,
1142                             NFSV4CL_LOCKNAMELEN);
1143                 nlp->nfsl_seqid = 0;
1144                 nlp->nfsl_lockflags = flags;
1145                 nlp->nfsl_inprog = NULL;
1146                 nfscl_lockinit(&nlp->nfsl_rwlock);
1147                 LIST_INIT(&nlp->nfsl_lock);
1148                 if (donelocally) {
1149                         nlp->nfsl_open = NULL;
1150                         nfsstatsv1.cllocallockowners++;
1151                 } else {
1152                         nlp->nfsl_open = op;
1153                         nfsstatsv1.cllockowners++;
1154                 }
1155                 LIST_INSERT_HEAD(lhp, nlp, nfsl_list);
1156                 lp = nlp;
1157                 nlp = NULL;
1158                 *newonep = 1;
1159         }
1160
1161         /*
1162          * Now, update the byte ranges for locks.
1163          */
1164         ret = nfscl_updatelock(lp, &nlop, &otherlop, donelocally);
1165         if (!ret)
1166                 donelocally = 1;
1167         if (donelocally) {
1168                 *donelocallyp = 1;
1169                 if (!recovery)
1170                         nfscl_clrelease(clp);
1171         } else {
1172                 /*
1173                  * Serial modifications on the lock owner for multiple threads
1174                  * for the same process using a read/write lock.
1175                  */
1176                 if (!recovery)
1177                         nfscl_lockexcl(&lp->nfsl_rwlock, NFSCLSTATEMUTEXPTR);
1178         }
1179         if (!recovery)
1180                 NFSUNLOCKCLSTATE();
1181
1182         if (nlp)
1183                 free(nlp, M_NFSCLLOCKOWNER);
1184         if (nlop)
1185                 free(nlop, M_NFSCLLOCK);
1186         if (otherlop)
1187                 free(otherlop, M_NFSCLLOCK);
1188
1189         *lpp = lp;
1190         return (0);
1191 }
1192
1193 /*
1194  * Called to unlock a byte range, for LockU.
1195  */
1196 int
1197 nfscl_relbytelock(vnode_t vp, u_int64_t off, u_int64_t len,
1198     __unused struct ucred *cred, NFSPROC_T *p, int callcnt,
1199     struct nfsclclient *clp, void *id, int flags,
1200     struct nfscllockowner **lpp, int *dorpcp)
1201 {
1202         struct nfscllockowner *lp;
1203         struct nfsclowner *owp;
1204         struct nfsclopen *op;
1205         struct nfscllock *nlop, *other_lop = NULL;
1206         struct nfscldeleg *dp;
1207         struct nfsnode *np;
1208         u_int8_t own[NFSV4CL_LOCKNAMELEN];
1209         int ret = 0, fnd;
1210
1211         np = VTONFS(vp);
1212         *lpp = NULL;
1213         *dorpcp = 0;
1214
1215         /*
1216          * Might need these, so MALLOC them now, to
1217          * avoid a tsleep() in MALLOC later.
1218          */
1219         nlop = malloc(
1220             sizeof (struct nfscllock), M_NFSCLLOCK, M_WAITOK);
1221         nlop->nfslo_type = F_UNLCK;
1222         nlop->nfslo_first = off;
1223         if (len == NFS64BITSSET) {
1224                 nlop->nfslo_end = NFS64BITSSET;
1225         } else {
1226                 nlop->nfslo_end = off + len;
1227                 if (nlop->nfslo_end <= nlop->nfslo_first) {
1228                         free(nlop, M_NFSCLLOCK);
1229                         return (NFSERR_INVAL);
1230                 }
1231         }
1232         if (callcnt == 0) {
1233                 other_lop = malloc(
1234                     sizeof (struct nfscllock), M_NFSCLLOCK, M_WAITOK);
1235                 *other_lop = *nlop;
1236         }
1237         nfscl_filllockowner(id, own, flags);
1238         dp = NULL;
1239         NFSLOCKCLSTATE();
1240         if (callcnt == 0)
1241                 dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh,
1242                     np->n_fhp->nfh_len);
1243
1244         /*
1245          * First, unlock any local regions on a delegation.
1246          */
1247         if (dp != NULL) {
1248                 /* Look for this lockowner. */
1249                 LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
1250                         if (!NFSBCMP(lp->nfsl_owner, own,
1251                             NFSV4CL_LOCKNAMELEN))
1252                                 break;
1253                 }
1254                 if (lp != NULL)
1255                         /* Use other_lop, so nlop is still available */
1256                         (void)nfscl_updatelock(lp, &other_lop, NULL, 1);
1257         }
1258
1259         /*
1260          * Now, find a matching open/lockowner that hasn't already been done,
1261          * as marked by nfsl_inprog.
1262          */
1263         lp = NULL;
1264         fnd = 0;
1265         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
1266             LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
1267                 if (op->nfso_fhlen == np->n_fhp->nfh_len &&
1268                     !NFSBCMP(op->nfso_fh, np->n_fhp->nfh_fh, op->nfso_fhlen)) {
1269                     LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
1270                         if (lp->nfsl_inprog == NULL &&
1271                             !NFSBCMP(lp->nfsl_owner, own,
1272                              NFSV4CL_LOCKNAMELEN)) {
1273                                 fnd = 1;
1274                                 break;
1275                         }
1276                     }
1277                     if (fnd)
1278                         break;
1279                 }
1280             }
1281             if (fnd)
1282                 break;
1283         }
1284
1285         if (lp != NULL) {
1286                 ret = nfscl_updatelock(lp, &nlop, NULL, 0);
1287                 if (ret)
1288                         *dorpcp = 1;
1289                 /*
1290                  * Serial modifications on the lock owner for multiple
1291                  * threads for the same process using a read/write lock.
1292                  */
1293                 lp->nfsl_inprog = p;
1294                 nfscl_lockexcl(&lp->nfsl_rwlock, NFSCLSTATEMUTEXPTR);
1295                 *lpp = lp;
1296         }
1297         NFSUNLOCKCLSTATE();
1298         if (nlop)
1299                 free(nlop, M_NFSCLLOCK);
1300         if (other_lop)
1301                 free(other_lop, M_NFSCLLOCK);
1302         return (0);
1303 }
1304
1305 /*
1306  * Release all lockowners marked in progess for this process and file.
1307  */
1308 void
1309 nfscl_releasealllocks(struct nfsclclient *clp, vnode_t vp, NFSPROC_T *p,
1310     void *id, int flags)
1311 {
1312         struct nfsclowner *owp;
1313         struct nfsclopen *op;
1314         struct nfscllockowner *lp;
1315         struct nfsnode *np;
1316         u_int8_t own[NFSV4CL_LOCKNAMELEN];
1317
1318         np = VTONFS(vp);
1319         nfscl_filllockowner(id, own, flags);
1320         NFSLOCKCLSTATE();
1321         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
1322             LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
1323                 if (op->nfso_fhlen == np->n_fhp->nfh_len &&
1324                     !NFSBCMP(op->nfso_fh, np->n_fhp->nfh_fh, op->nfso_fhlen)) {
1325                     LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
1326                         if (lp->nfsl_inprog == p &&
1327                             !NFSBCMP(lp->nfsl_owner, own,
1328                             NFSV4CL_LOCKNAMELEN)) {
1329                             lp->nfsl_inprog = NULL;
1330                             nfscl_lockunlock(&lp->nfsl_rwlock);
1331                         }
1332                     }
1333                 }
1334             }
1335         }
1336         nfscl_clrelease(clp);
1337         NFSUNLOCKCLSTATE();
1338 }
1339
1340 /*
1341  * Called to find out if any bytes within the byte range specified are
1342  * write locked by the calling process. Used to determine if flushing
1343  * is required before a LockU.
1344  * If in doubt, return 1, so the flush will occur.
1345  */
1346 int
1347 nfscl_checkwritelocked(vnode_t vp, struct flock *fl,
1348     struct ucred *cred, NFSPROC_T *p, void *id, int flags)
1349 {
1350         struct nfsclowner *owp;
1351         struct nfscllockowner *lp;
1352         struct nfsclopen *op;
1353         struct nfsclclient *clp;
1354         struct nfscllock *lop;
1355         struct nfscldeleg *dp;
1356         struct nfsnode *np;
1357         u_int64_t off, end;
1358         u_int8_t own[NFSV4CL_LOCKNAMELEN];
1359         int error = 0;
1360
1361         np = VTONFS(vp);
1362         switch (fl->l_whence) {
1363         case SEEK_SET:
1364         case SEEK_CUR:
1365                 /*
1366                  * Caller is responsible for adding any necessary offset
1367                  * when SEEK_CUR is used.
1368                  */
1369                 off = fl->l_start;
1370                 break;
1371         case SEEK_END:
1372                 off = np->n_size + fl->l_start;
1373                 break;
1374         default:
1375                 return (1);
1376         }
1377         if (fl->l_len != 0) {
1378                 end = off + fl->l_len;
1379                 if (end < off)
1380                         return (1);
1381         } else {
1382                 end = NFS64BITSSET;
1383         }
1384
1385         error = nfscl_getcl(vp->v_mount, cred, p, 1, &clp);
1386         if (error)
1387                 return (1);
1388         nfscl_filllockowner(id, own, flags);
1389         NFSLOCKCLSTATE();
1390
1391         /*
1392          * First check the delegation locks.
1393          */
1394         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
1395         if (dp != NULL) {
1396                 LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
1397                         if (!NFSBCMP(lp->nfsl_owner, own,
1398                             NFSV4CL_LOCKNAMELEN))
1399                                 break;
1400                 }
1401                 if (lp != NULL) {
1402                         LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
1403                                 if (lop->nfslo_first >= end)
1404                                         break;
1405                                 if (lop->nfslo_end <= off)
1406                                         continue;
1407                                 if (lop->nfslo_type == F_WRLCK) {
1408                                         nfscl_clrelease(clp);
1409                                         NFSUNLOCKCLSTATE();
1410                                         return (1);
1411                                 }
1412                         }
1413                 }
1414         }
1415
1416         /*
1417          * Now, check state against the server.
1418          */
1419         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
1420             LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
1421                 if (op->nfso_fhlen == np->n_fhp->nfh_len &&
1422                     !NFSBCMP(op->nfso_fh, np->n_fhp->nfh_fh, op->nfso_fhlen)) {
1423                     LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
1424                         if (!NFSBCMP(lp->nfsl_owner, own,
1425                             NFSV4CL_LOCKNAMELEN))
1426                             break;
1427                     }
1428                     if (lp != NULL) {
1429                         LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
1430                             if (lop->nfslo_first >= end)
1431                                 break;
1432                             if (lop->nfslo_end <= off)
1433                                 continue;
1434                             if (lop->nfslo_type == F_WRLCK) {
1435                                 nfscl_clrelease(clp);
1436                                 NFSUNLOCKCLSTATE();
1437                                 return (1);
1438                             }
1439                         }
1440                     }
1441                 }
1442             }
1443         }
1444         nfscl_clrelease(clp);
1445         NFSUNLOCKCLSTATE();
1446         return (0);
1447 }
1448
1449 /*
1450  * Release a byte range lock owner structure.
1451  */
1452 void
1453 nfscl_lockrelease(struct nfscllockowner *lp, int error, int candelete)
1454 {
1455         struct nfsclclient *clp;
1456
1457         if (lp == NULL)
1458                 return;
1459         NFSLOCKCLSTATE();
1460         clp = lp->nfsl_open->nfso_own->nfsow_clp;
1461         if (error != 0 && candelete &&
1462             (lp->nfsl_rwlock.nfslock_lock & NFSV4LOCK_WANTED) == 0)
1463                 nfscl_freelockowner(lp, 0);
1464         else
1465                 nfscl_lockunlock(&lp->nfsl_rwlock);
1466         nfscl_clrelease(clp);
1467         NFSUNLOCKCLSTATE();
1468 }
1469
1470 /*
1471  * Free up an open structure and any associated byte range lock structures.
1472  */
1473 void
1474 nfscl_freeopen(struct nfsclopen *op, int local)
1475 {
1476
1477         LIST_REMOVE(op, nfso_list);
1478         nfscl_freealllocks(&op->nfso_lock, local);
1479         free(op, M_NFSCLOPEN);
1480         if (local)
1481                 nfsstatsv1.cllocalopens--;
1482         else
1483                 nfsstatsv1.clopens--;
1484 }
1485
1486 /*
1487  * Free up all lock owners and associated locks.
1488  */
1489 static void
1490 nfscl_freealllocks(struct nfscllockownerhead *lhp, int local)
1491 {
1492         struct nfscllockowner *lp, *nlp;
1493
1494         LIST_FOREACH_SAFE(lp, lhp, nfsl_list, nlp) {
1495                 if ((lp->nfsl_rwlock.nfslock_lock & NFSV4LOCK_WANTED))
1496                         panic("nfscllckw");
1497                 nfscl_freelockowner(lp, local);
1498         }
1499 }
1500
1501 /*
1502  * Called for an Open when NFSERR_EXPIRED is received from the server.
1503  * If there are no byte range locks nor a Share Deny lost, try to do a
1504  * fresh Open. Otherwise, free the open.
1505  */
1506 static int
1507 nfscl_expireopen(struct nfsclclient *clp, struct nfsclopen *op,
1508     struct nfsmount *nmp, struct ucred *cred, NFSPROC_T *p)
1509 {
1510         struct nfscllockowner *lp;
1511         struct nfscldeleg *dp;
1512         int mustdelete = 0, error;
1513
1514         /*
1515          * Look for any byte range lock(s).
1516          */
1517         LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
1518                 if (!LIST_EMPTY(&lp->nfsl_lock)) {
1519                         mustdelete = 1;
1520                         break;
1521                 }
1522         }
1523
1524         /*
1525          * If no byte range lock(s) nor a Share deny, try to re-open.
1526          */
1527         if (!mustdelete && (op->nfso_mode & NFSLCK_DENYBITS) == 0) {
1528                 newnfs_copycred(&op->nfso_cred, cred);
1529                 dp = NULL;
1530                 error = nfsrpc_reopen(nmp, op->nfso_fh,
1531                     op->nfso_fhlen, op->nfso_mode, op, &dp, cred, p);
1532                 if (error) {
1533                         mustdelete = 1;
1534                         if (dp != NULL) {
1535                                 free(dp, M_NFSCLDELEG);
1536                                 dp = NULL;
1537                         }
1538                 }
1539                 if (dp != NULL)
1540                         nfscl_deleg(nmp->nm_mountp, clp, op->nfso_fh,
1541                             op->nfso_fhlen, cred, p, &dp);
1542         }
1543
1544         /*
1545          * If a byte range lock or Share deny or couldn't re-open, free it.
1546          */
1547         if (mustdelete)
1548                 nfscl_freeopen(op, 0);
1549         return (mustdelete);
1550 }
1551
1552 /*
1553  * Free up an open owner structure.
1554  */
1555 static void
1556 nfscl_freeopenowner(struct nfsclowner *owp, int local)
1557 {
1558
1559         LIST_REMOVE(owp, nfsow_list);
1560         free(owp, M_NFSCLOWNER);
1561         if (local)
1562                 nfsstatsv1.cllocalopenowners--;
1563         else
1564                 nfsstatsv1.clopenowners--;
1565 }
1566
1567 /*
1568  * Free up a byte range lock owner structure.
1569  */
1570 void
1571 nfscl_freelockowner(struct nfscllockowner *lp, int local)
1572 {
1573         struct nfscllock *lop, *nlop;
1574
1575         LIST_REMOVE(lp, nfsl_list);
1576         LIST_FOREACH_SAFE(lop, &lp->nfsl_lock, nfslo_list, nlop) {
1577                 nfscl_freelock(lop, local);
1578         }
1579         free(lp, M_NFSCLLOCKOWNER);
1580         if (local)
1581                 nfsstatsv1.cllocallockowners--;
1582         else
1583                 nfsstatsv1.cllockowners--;
1584 }
1585
1586 /*
1587  * Free up a byte range lock structure.
1588  */
1589 void
1590 nfscl_freelock(struct nfscllock *lop, int local)
1591 {
1592
1593         LIST_REMOVE(lop, nfslo_list);
1594         free(lop, M_NFSCLLOCK);
1595         if (local)
1596                 nfsstatsv1.cllocallocks--;
1597         else
1598                 nfsstatsv1.cllocks--;
1599 }
1600
1601 /*
1602  * Clean out the state related to a delegation.
1603  */
1604 static void
1605 nfscl_cleandeleg(struct nfscldeleg *dp)
1606 {
1607         struct nfsclowner *owp, *nowp;
1608         struct nfsclopen *op;
1609
1610         LIST_FOREACH_SAFE(owp, &dp->nfsdl_owner, nfsow_list, nowp) {
1611                 op = LIST_FIRST(&owp->nfsow_open);
1612                 if (op != NULL) {
1613                         if (LIST_NEXT(op, nfso_list) != NULL)
1614                                 panic("nfscleandel");
1615                         nfscl_freeopen(op, 1);
1616                 }
1617                 nfscl_freeopenowner(owp, 1);
1618         }
1619         nfscl_freealllocks(&dp->nfsdl_lock, 1);
1620 }
1621
1622 /*
1623  * Free a delegation.
1624  */
1625 static void
1626 nfscl_freedeleg(struct nfscldeleghead *hdp, struct nfscldeleg *dp, bool freeit)
1627 {
1628
1629         TAILQ_REMOVE(hdp, dp, nfsdl_list);
1630         LIST_REMOVE(dp, nfsdl_hash);
1631         if (freeit)
1632                 free(dp, M_NFSCLDELEG);
1633         nfsstatsv1.cldelegates--;
1634         nfscl_delegcnt--;
1635 }
1636
1637 /*
1638  * Free up all state related to this client structure.
1639  */
1640 static void
1641 nfscl_cleanclient(struct nfsclclient *clp)
1642 {
1643         struct nfsclowner *owp, *nowp;
1644         struct nfsclopen *op, *nop;
1645         struct nfscllayout *lyp, *nlyp;
1646         struct nfscldevinfo *dip, *ndip;
1647
1648         TAILQ_FOREACH_SAFE(lyp, &clp->nfsc_layout, nfsly_list, nlyp)
1649                 nfscl_freelayout(lyp);
1650
1651         LIST_FOREACH_SAFE(dip, &clp->nfsc_devinfo, nfsdi_list, ndip)
1652                 nfscl_freedevinfo(dip);
1653
1654         /* Now, all the OpenOwners, etc. */
1655         LIST_FOREACH_SAFE(owp, &clp->nfsc_owner, nfsow_list, nowp) {
1656                 LIST_FOREACH_SAFE(op, &owp->nfsow_open, nfso_list, nop) {
1657                         nfscl_freeopen(op, 0);
1658                 }
1659                 nfscl_freeopenowner(owp, 0);
1660         }
1661 }
1662
1663 /*
1664  * Called when an NFSERR_EXPIRED is received from the server.
1665  */
1666 static void
1667 nfscl_expireclient(struct nfsclclient *clp, struct nfsmount *nmp,
1668     struct ucred *cred, NFSPROC_T *p)
1669 {
1670         struct nfsclowner *owp, *nowp, *towp;
1671         struct nfsclopen *op, *nop, *top;
1672         struct nfscldeleg *dp, *ndp;
1673         int ret, printed = 0;
1674
1675         /*
1676          * First, merge locally issued Opens into the list for the server.
1677          */
1678         dp = TAILQ_FIRST(&clp->nfsc_deleg);
1679         while (dp != NULL) {
1680             ndp = TAILQ_NEXT(dp, nfsdl_list);
1681             owp = LIST_FIRST(&dp->nfsdl_owner);
1682             while (owp != NULL) {
1683                 nowp = LIST_NEXT(owp, nfsow_list);
1684                 op = LIST_FIRST(&owp->nfsow_open);
1685                 if (op != NULL) {
1686                     if (LIST_NEXT(op, nfso_list) != NULL)
1687                         panic("nfsclexp");
1688                     LIST_FOREACH(towp, &clp->nfsc_owner, nfsow_list) {
1689                         if (!NFSBCMP(towp->nfsow_owner, owp->nfsow_owner,
1690                             NFSV4CL_LOCKNAMELEN))
1691                             break;
1692                     }
1693                     if (towp != NULL) {
1694                         /* Merge opens in */
1695                         LIST_FOREACH(top, &towp->nfsow_open, nfso_list) {
1696                             if (top->nfso_fhlen == op->nfso_fhlen &&
1697                                 !NFSBCMP(top->nfso_fh, op->nfso_fh,
1698                                  op->nfso_fhlen)) {
1699                                 top->nfso_mode |= op->nfso_mode;
1700                                 top->nfso_opencnt += op->nfso_opencnt;
1701                                 break;
1702                             }
1703                         }
1704                         if (top == NULL) {
1705                             /* Just add the open to the owner list */
1706                             LIST_REMOVE(op, nfso_list);
1707                             op->nfso_own = towp;
1708                             LIST_INSERT_HEAD(&towp->nfsow_open, op, nfso_list);
1709                             nfsstatsv1.cllocalopens--;
1710                             nfsstatsv1.clopens++;
1711                         }
1712                     } else {
1713                         /* Just add the openowner to the client list */
1714                         LIST_REMOVE(owp, nfsow_list);
1715                         owp->nfsow_clp = clp;
1716                         LIST_INSERT_HEAD(&clp->nfsc_owner, owp, nfsow_list);
1717                         nfsstatsv1.cllocalopenowners--;
1718                         nfsstatsv1.clopenowners++;
1719                         nfsstatsv1.cllocalopens--;
1720                         nfsstatsv1.clopens++;
1721                     }
1722                 }
1723                 owp = nowp;
1724             }
1725             if (!printed && !LIST_EMPTY(&dp->nfsdl_lock)) {
1726                 printed = 1;
1727                 printf("nfsv4 expired locks lost\n");
1728             }
1729             nfscl_cleandeleg(dp);
1730             nfscl_freedeleg(&clp->nfsc_deleg, dp, true);
1731             dp = ndp;
1732         }
1733         if (!TAILQ_EMPTY(&clp->nfsc_deleg))
1734             panic("nfsclexp");
1735
1736         /*
1737          * Now, try and reopen against the server.
1738          */
1739         LIST_FOREACH_SAFE(owp, &clp->nfsc_owner, nfsow_list, nowp) {
1740                 owp->nfsow_seqid = 0;
1741                 LIST_FOREACH_SAFE(op, &owp->nfsow_open, nfso_list, nop) {
1742                         ret = nfscl_expireopen(clp, op, nmp, cred, p);
1743                         if (ret && !printed) {
1744                                 printed = 1;
1745                                 printf("nfsv4 expired locks lost\n");
1746                         }
1747                 }
1748                 if (LIST_EMPTY(&owp->nfsow_open))
1749                         nfscl_freeopenowner(owp, 0);
1750         }
1751 }
1752
1753 /*
1754  * This function must be called after the process represented by "own" has
1755  * exited. Must be called with CLSTATE lock held.
1756  */
1757 static void
1758 nfscl_cleanup_common(struct nfsclclient *clp, u_int8_t *own)
1759 {
1760         struct nfsclowner *owp, *nowp;
1761         struct nfscllockowner *lp, *nlp;
1762         struct nfscldeleg *dp;
1763
1764         /* First, get rid of local locks on delegations. */
1765         TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
1766                 LIST_FOREACH_SAFE(lp, &dp->nfsdl_lock, nfsl_list, nlp) {
1767                     if (!NFSBCMP(lp->nfsl_owner, own, NFSV4CL_LOCKNAMELEN)) {
1768                         if ((lp->nfsl_rwlock.nfslock_lock & NFSV4LOCK_WANTED))
1769                             panic("nfscllckw");
1770                         nfscl_freelockowner(lp, 1);
1771                     }
1772                 }
1773         }
1774         owp = LIST_FIRST(&clp->nfsc_owner);
1775         while (owp != NULL) {
1776                 nowp = LIST_NEXT(owp, nfsow_list);
1777                 if (!NFSBCMP(owp->nfsow_owner, own,
1778                     NFSV4CL_LOCKNAMELEN)) {
1779                         /*
1780                          * If there are children that haven't closed the
1781                          * file descriptors yet, the opens will still be
1782                          * here. For that case, let the renew thread clear
1783                          * out the OpenOwner later.
1784                          */
1785                         if (LIST_EMPTY(&owp->nfsow_open))
1786                                 nfscl_freeopenowner(owp, 0);
1787                         else
1788                                 owp->nfsow_defunct = 1;
1789                 }
1790                 owp = nowp;
1791         }
1792 }
1793
1794 /*
1795  * Find open/lock owners for processes that have exited.
1796  */
1797 static void
1798 nfscl_cleanupkext(struct nfsclclient *clp, struct nfscllockownerfhhead *lhp)
1799 {
1800         struct nfsclowner *owp, *nowp;
1801         struct nfsclopen *op;
1802         struct nfscllockowner *lp, *nlp;
1803         struct nfscldeleg *dp;
1804
1805         /*
1806          * All the pidhash locks must be acquired, since they are sx locks
1807          * and must be acquired before the mutexes.  The pid(s) that will
1808          * be used aren't known yet, so all the locks need to be acquired.
1809          * Fortunately, this function is only performed once/sec.
1810          */
1811         pidhash_slockall();
1812         NFSLOCKCLSTATE();
1813         LIST_FOREACH_SAFE(owp, &clp->nfsc_owner, nfsow_list, nowp) {
1814                 LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
1815                         LIST_FOREACH_SAFE(lp, &op->nfso_lock, nfsl_list, nlp) {
1816                                 if (LIST_EMPTY(&lp->nfsl_lock))
1817                                         nfscl_emptylockowner(lp, lhp);
1818                         }
1819                 }
1820                 if (nfscl_procdoesntexist(owp->nfsow_owner))
1821                         nfscl_cleanup_common(clp, owp->nfsow_owner);
1822         }
1823
1824         /*
1825          * For the single open_owner case, these lock owners need to be
1826          * checked to see if they still exist separately.
1827          * This is because nfscl_procdoesntexist() never returns true for
1828          * the single open_owner so that the above doesn't ever call
1829          * nfscl_cleanup_common().
1830          */
1831         TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
1832                 LIST_FOREACH_SAFE(lp, &dp->nfsdl_lock, nfsl_list, nlp) {
1833                         if (nfscl_procdoesntexist(lp->nfsl_owner))
1834                                 nfscl_cleanup_common(clp, lp->nfsl_owner);
1835                 }
1836         }
1837         NFSUNLOCKCLSTATE();
1838         pidhash_sunlockall();
1839 }
1840
1841 /*
1842  * Take the empty lock owner and move it to the local lhp list if the
1843  * associated process no longer exists.
1844  */
1845 static void
1846 nfscl_emptylockowner(struct nfscllockowner *lp,
1847     struct nfscllockownerfhhead *lhp)
1848 {
1849         struct nfscllockownerfh *lfhp, *mylfhp;
1850         struct nfscllockowner *nlp;
1851         int fnd_it;
1852
1853         /* If not a Posix lock owner, just return. */
1854         if ((lp->nfsl_lockflags & F_POSIX) == 0)
1855                 return;
1856
1857         fnd_it = 0;
1858         mylfhp = NULL;
1859         /*
1860          * First, search to see if this lock owner is already in the list.
1861          * If it is, then the associated process no longer exists.
1862          */
1863         SLIST_FOREACH(lfhp, lhp, nfslfh_list) {
1864                 if (lfhp->nfslfh_len == lp->nfsl_open->nfso_fhlen &&
1865                     !NFSBCMP(lfhp->nfslfh_fh, lp->nfsl_open->nfso_fh,
1866                     lfhp->nfslfh_len))
1867                         mylfhp = lfhp;
1868                 LIST_FOREACH(nlp, &lfhp->nfslfh_lock, nfsl_list)
1869                         if (!NFSBCMP(nlp->nfsl_owner, lp->nfsl_owner,
1870                             NFSV4CL_LOCKNAMELEN))
1871                                 fnd_it = 1;
1872         }
1873         /* If not found, check if process still exists. */
1874         if (fnd_it == 0 && nfscl_procdoesntexist(lp->nfsl_owner) == 0)
1875                 return;
1876
1877         /* Move the lock owner over to the local list. */
1878         if (mylfhp == NULL) {
1879                 mylfhp = malloc(sizeof(struct nfscllockownerfh), M_TEMP,
1880                     M_NOWAIT);
1881                 if (mylfhp == NULL)
1882                         return;
1883                 mylfhp->nfslfh_len = lp->nfsl_open->nfso_fhlen;
1884                 NFSBCOPY(lp->nfsl_open->nfso_fh, mylfhp->nfslfh_fh,
1885                     mylfhp->nfslfh_len);
1886                 LIST_INIT(&mylfhp->nfslfh_lock);
1887                 SLIST_INSERT_HEAD(lhp, mylfhp, nfslfh_list);
1888         }
1889         LIST_REMOVE(lp, nfsl_list);
1890         LIST_INSERT_HEAD(&mylfhp->nfslfh_lock, lp, nfsl_list);
1891 }
1892
1893 static int      fake_global;    /* Used to force visibility of MNTK_UNMOUNTF */
1894 /*
1895  * Called from nfs umount to free up the clientid.
1896  */
1897 void
1898 nfscl_umount(struct nfsmount *nmp, NFSPROC_T *p)
1899 {
1900         struct nfsclclient *clp;
1901         struct ucred *cred;
1902         int igotlock;
1903
1904         /*
1905          * For the case that matters, this is the thread that set
1906          * MNTK_UNMOUNTF, so it will see it set. The code that follows is
1907          * done to ensure that any thread executing nfscl_getcl() after
1908          * this time, will see MNTK_UNMOUNTF set. nfscl_getcl() uses the
1909          * mutex for NFSLOCKCLSTATE(), so it is "m" for the following
1910          * explanation, courtesy of Alan Cox.
1911          * What follows is a snippet from Alan Cox's email at:
1912          * https://docs.FreeBSD.org/cgi/mid.cgi?BANLkTikR3d65zPHo9==08ZfJ2vmqZucEvw
1913          *
1914          * 1. Set MNTK_UNMOUNTF
1915          * 2. Acquire a standard FreeBSD mutex "m".
1916          * 3. Update some data structures.
1917          * 4. Release mutex "m".
1918          *
1919          * Then, other threads that acquire "m" after step 4 has occurred will
1920          * see MNTK_UNMOUNTF as set.  But, other threads that beat thread X to
1921          * step 2 may or may not see MNTK_UNMOUNTF as set.
1922          */
1923         NFSLOCKCLSTATE();
1924         if ((nmp->nm_mountp->mnt_kern_flag & MNTK_UNMOUNTF) != 0) {
1925                 fake_global++;
1926                 NFSUNLOCKCLSTATE();
1927                 NFSLOCKCLSTATE();
1928         }
1929
1930         clp = nmp->nm_clp;
1931         if (clp != NULL) {
1932                 if ((clp->nfsc_flags & NFSCLFLAGS_INITED) == 0)
1933                         panic("nfscl umount");
1934
1935                 /*
1936                  * First, handshake with the nfscl renew thread, to terminate
1937                  * it.
1938                  */
1939                 clp->nfsc_flags |= NFSCLFLAGS_UMOUNT;
1940                 while (clp->nfsc_flags & NFSCLFLAGS_HASTHREAD)
1941                         (void)mtx_sleep(clp, NFSCLSTATEMUTEXPTR, PWAIT,
1942                             "nfsclumnt", hz);
1943
1944                 /*
1945                  * Now, get the exclusive lock on the client state, so
1946                  * that no uses of the state are still in progress.
1947                  */
1948                 do {
1949                         igotlock = nfsv4_lock(&clp->nfsc_lock, 1, NULL,
1950                             NFSCLSTATEMUTEXPTR, NULL);
1951                 } while (!igotlock);
1952                 NFSUNLOCKCLSTATE();
1953
1954                 /*
1955                  * Free up all the state. It will expire on the server, but
1956                  * maybe we should do a SetClientId/SetClientIdConfirm so
1957                  * the server throws it away?
1958                  */
1959                 LIST_REMOVE(clp, nfsc_list);
1960                 nfscl_delegreturnall(clp, p);
1961                 cred = newnfs_getcred();
1962                 if (NFSHASNFSV4N(nmp)) {
1963                         (void)nfsrpc_destroysession(nmp, clp, cred, p);
1964                         (void)nfsrpc_destroyclient(nmp, clp, cred, p);
1965                 } else
1966                         (void)nfsrpc_setclient(nmp, clp, 0, NULL, cred, p);
1967                 nfscl_cleanclient(clp);
1968                 nmp->nm_clp = NULL;
1969                 NFSFREECRED(cred);
1970                 free(clp, M_NFSCLCLIENT);
1971         } else
1972                 NFSUNLOCKCLSTATE();
1973 }
1974
1975 /*
1976  * This function is called when a server replies with NFSERR_STALECLIENTID
1977  * NFSERR_STALESTATEID or NFSERR_BADSESSION. It traverses the clientid lists,
1978  * doing Opens and Locks with reclaim. If these fail, it deletes the
1979  * corresponding state.
1980  */
1981 static void
1982 nfscl_recover(struct nfsclclient *clp, bool *retokp, struct ucred *cred,
1983     NFSPROC_T *p)
1984 {
1985         struct nfsclowner *owp, *nowp;
1986         struct nfsclopen *op, *nop;
1987         struct nfscllockowner *lp, *nlp;
1988         struct nfscllock *lop, *nlop;
1989         struct nfscldeleg *dp, *ndp, *tdp;
1990         struct nfsmount *nmp;
1991         struct ucred *tcred;
1992         struct nfsclopenhead extra_open;
1993         struct nfscldeleghead extra_deleg;
1994         struct nfsreq *rep;
1995         u_int64_t len;
1996         u_int32_t delegtype = NFSV4OPEN_DELEGATEWRITE, mode;
1997         int i, igotlock = 0, error, trycnt, firstlock;
1998         struct nfscllayout *lyp, *nlyp;
1999
2000         /*
2001          * First, lock the client structure, so everyone else will
2002          * block when trying to use state.
2003          */
2004         NFSLOCKCLSTATE();
2005         clp->nfsc_flags |= NFSCLFLAGS_RECVRINPROG;
2006         do {
2007                 igotlock = nfsv4_lock(&clp->nfsc_lock, 1, NULL,
2008                     NFSCLSTATEMUTEXPTR, NULL);
2009         } while (!igotlock);
2010         NFSUNLOCKCLSTATE();
2011
2012         nmp = clp->nfsc_nmp;
2013         if (nmp == NULL)
2014                 panic("nfscl recover");
2015
2016         /*
2017          * For now, just get rid of all layouts. There may be a need
2018          * to do LayoutCommit Ops with reclaim == true later.
2019          */
2020         TAILQ_FOREACH_SAFE(lyp, &clp->nfsc_layout, nfsly_list, nlyp)
2021                 nfscl_freelayout(lyp);
2022         TAILQ_INIT(&clp->nfsc_layout);
2023         for (i = 0; i < NFSCLLAYOUTHASHSIZE; i++)
2024                 LIST_INIT(&clp->nfsc_layouthash[i]);
2025
2026         trycnt = 5;
2027         tcred = NULL;
2028         do {
2029                 error = nfsrpc_setclient(nmp, clp, 1, retokp, cred, p);
2030         } while ((error == NFSERR_STALECLIENTID ||
2031              error == NFSERR_BADSESSION ||
2032              error == NFSERR_STALEDONTRECOVER) && --trycnt > 0);
2033         if (error) {
2034                 NFSLOCKCLSTATE();
2035                 clp->nfsc_flags &= ~(NFSCLFLAGS_RECOVER |
2036                     NFSCLFLAGS_RECVRINPROG);
2037                 wakeup(&clp->nfsc_flags);
2038                 nfsv4_unlock(&clp->nfsc_lock, 0);
2039                 NFSUNLOCKCLSTATE();
2040                 return;
2041         }
2042         clp->nfsc_flags |= NFSCLFLAGS_HASCLIENTID;
2043         clp->nfsc_flags &= ~NFSCLFLAGS_RECOVER;
2044
2045         /*
2046          * Mark requests already queued on the server, so that they don't
2047          * initiate another recovery cycle. Any requests already in the
2048          * queue that handle state information will have the old stale
2049          * clientid/stateid and will get a NFSERR_STALESTATEID,
2050          * NFSERR_STALECLIENTID or NFSERR_BADSESSION reply from the server.
2051          * This will be translated to NFSERR_STALEDONTRECOVER when
2052          * R_DONTRECOVER is set.
2053          */
2054         NFSLOCKREQ();
2055         TAILQ_FOREACH(rep, &nfsd_reqq, r_chain) {
2056                 if (rep->r_nmp == nmp)
2057                         rep->r_flags |= R_DONTRECOVER;
2058         }
2059         NFSUNLOCKREQ();
2060
2061         /*
2062          * If nfsrpc_setclient() returns *retokp == true,
2063          * no more recovery is needed.
2064          */
2065         if (*retokp)
2066                 goto out;
2067
2068         /*
2069          * Now, mark all delegations "need reclaim".
2070          */
2071         TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list)
2072                 dp->nfsdl_flags |= NFSCLDL_NEEDRECLAIM;
2073
2074         TAILQ_INIT(&extra_deleg);
2075         LIST_INIT(&extra_open);
2076         /*
2077          * Now traverse the state lists, doing Open and Lock Reclaims.
2078          */
2079         tcred = newnfs_getcred();
2080         owp = LIST_FIRST(&clp->nfsc_owner);
2081         while (owp != NULL) {
2082             nowp = LIST_NEXT(owp, nfsow_list);
2083             owp->nfsow_seqid = 0;
2084             op = LIST_FIRST(&owp->nfsow_open);
2085             while (op != NULL) {
2086                 nop = LIST_NEXT(op, nfso_list);
2087                 if (error != NFSERR_NOGRACE && error != NFSERR_BADSESSION) {
2088                     /* Search for a delegation to reclaim with the open */
2089                     TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
2090                         if (!(dp->nfsdl_flags & NFSCLDL_NEEDRECLAIM))
2091                             continue;
2092                         if ((dp->nfsdl_flags & NFSCLDL_WRITE)) {
2093                             mode = NFSV4OPEN_ACCESSWRITE;
2094                             delegtype = NFSV4OPEN_DELEGATEWRITE;
2095                         } else {
2096                             mode = NFSV4OPEN_ACCESSREAD;
2097                             delegtype = NFSV4OPEN_DELEGATEREAD;
2098                         }
2099                         if ((op->nfso_mode & mode) == mode &&
2100                             op->nfso_fhlen == dp->nfsdl_fhlen &&
2101                             !NFSBCMP(op->nfso_fh, dp->nfsdl_fh, op->nfso_fhlen))
2102                             break;
2103                     }
2104                     ndp = dp;
2105                     if (dp == NULL)
2106                         delegtype = NFSV4OPEN_DELEGATENONE;
2107                     newnfs_copycred(&op->nfso_cred, tcred);
2108                     error = nfscl_tryopen(nmp, NULL, op->nfso_fh,
2109                         op->nfso_fhlen, op->nfso_fh, op->nfso_fhlen,
2110                         op->nfso_mode, op, NULL, 0, &ndp, 1, delegtype,
2111                         tcred, p);
2112                     if (!error) {
2113                         /* Handle any replied delegation */
2114                         if (ndp != NULL && ((ndp->nfsdl_flags & NFSCLDL_WRITE)
2115                             || NFSMNT_RDONLY(nmp->nm_mountp))) {
2116                             if ((ndp->nfsdl_flags & NFSCLDL_WRITE))
2117                                 mode = NFSV4OPEN_ACCESSWRITE;
2118                             else
2119                                 mode = NFSV4OPEN_ACCESSREAD;
2120                             TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
2121                                 if (!(dp->nfsdl_flags & NFSCLDL_NEEDRECLAIM))
2122                                     continue;
2123                                 if ((op->nfso_mode & mode) == mode &&
2124                                     op->nfso_fhlen == dp->nfsdl_fhlen &&
2125                                     !NFSBCMP(op->nfso_fh, dp->nfsdl_fh,
2126                                     op->nfso_fhlen)) {
2127                                     dp->nfsdl_stateid = ndp->nfsdl_stateid;
2128                                     dp->nfsdl_sizelimit = ndp->nfsdl_sizelimit;
2129                                     dp->nfsdl_ace = ndp->nfsdl_ace;
2130                                     dp->nfsdl_change = ndp->nfsdl_change;
2131                                     dp->nfsdl_flags &= ~NFSCLDL_NEEDRECLAIM;
2132                                     if ((ndp->nfsdl_flags & NFSCLDL_RECALL))
2133                                         dp->nfsdl_flags |= NFSCLDL_RECALL;
2134                                     free(ndp, M_NFSCLDELEG);
2135                                     ndp = NULL;
2136                                     break;
2137                                 }
2138                             }
2139                         }
2140                         if (ndp != NULL)
2141                             TAILQ_INSERT_HEAD(&extra_deleg, ndp, nfsdl_list);
2142
2143                         /* and reclaim all byte range locks */
2144                         lp = LIST_FIRST(&op->nfso_lock);
2145                         while (lp != NULL) {
2146                             nlp = LIST_NEXT(lp, nfsl_list);
2147                             lp->nfsl_seqid = 0;
2148                             firstlock = 1;
2149                             lop = LIST_FIRST(&lp->nfsl_lock);
2150                             while (lop != NULL) {
2151                                 nlop = LIST_NEXT(lop, nfslo_list);
2152                                 if (lop->nfslo_end == NFS64BITSSET)
2153                                     len = NFS64BITSSET;
2154                                 else
2155                                     len = lop->nfslo_end - lop->nfslo_first;
2156                                 error = nfscl_trylock(nmp, NULL,
2157                                     op->nfso_fh, op->nfso_fhlen, lp,
2158                                     firstlock, 1, lop->nfslo_first, len,
2159                                     lop->nfslo_type, tcred, p);
2160                                 if (error != 0)
2161                                     nfscl_freelock(lop, 0);
2162                                 else
2163                                     firstlock = 0;
2164                                 lop = nlop;
2165                             }
2166                             /* If no locks, but a lockowner, just delete it. */
2167                             if (LIST_EMPTY(&lp->nfsl_lock))
2168                                 nfscl_freelockowner(lp, 0);
2169                             lp = nlp;
2170                         }
2171                     }
2172                 }
2173                 if (error != 0 && error != NFSERR_BADSESSION)
2174                     nfscl_freeopen(op, 0);
2175                 op = nop;
2176             }
2177             owp = nowp;
2178         }
2179
2180         /*
2181          * Now, try and get any delegations not yet reclaimed by cobbling
2182          * to-gether an appropriate open.
2183          */
2184         nowp = NULL;
2185         dp = TAILQ_FIRST(&clp->nfsc_deleg);
2186         while (dp != NULL) {
2187             ndp = TAILQ_NEXT(dp, nfsdl_list);
2188             if ((dp->nfsdl_flags & NFSCLDL_NEEDRECLAIM)) {
2189                 if (nowp == NULL) {
2190                     nowp = malloc(
2191                         sizeof (struct nfsclowner), M_NFSCLOWNER, M_WAITOK);
2192                     /*
2193                      * Name must be as long an largest possible
2194                      * NFSV4CL_LOCKNAMELEN. 12 for now.
2195                      */
2196                     NFSBCOPY("RECLAIMDELEG", nowp->nfsow_owner,
2197                         NFSV4CL_LOCKNAMELEN);
2198                     LIST_INIT(&nowp->nfsow_open);
2199                     nowp->nfsow_clp = clp;
2200                     nowp->nfsow_seqid = 0;
2201                     nowp->nfsow_defunct = 0;
2202                     nfscl_lockinit(&nowp->nfsow_rwlock);
2203                 }
2204                 nop = NULL;
2205                 if (error != NFSERR_NOGRACE && error != NFSERR_BADSESSION) {
2206                     nop = malloc(sizeof (struct nfsclopen) +
2207                         dp->nfsdl_fhlen - 1, M_NFSCLOPEN, M_WAITOK);
2208                     nop->nfso_own = nowp;
2209                     if ((dp->nfsdl_flags & NFSCLDL_WRITE)) {
2210                         nop->nfso_mode = NFSV4OPEN_ACCESSWRITE;
2211                         delegtype = NFSV4OPEN_DELEGATEWRITE;
2212                     } else {
2213                         nop->nfso_mode = NFSV4OPEN_ACCESSREAD;
2214                         delegtype = NFSV4OPEN_DELEGATEREAD;
2215                     }
2216                     nop->nfso_opencnt = 0;
2217                     nop->nfso_posixlock = 1;
2218                     nop->nfso_fhlen = dp->nfsdl_fhlen;
2219                     NFSBCOPY(dp->nfsdl_fh, nop->nfso_fh, dp->nfsdl_fhlen);
2220                     LIST_INIT(&nop->nfso_lock);
2221                     nop->nfso_stateid.seqid = 0;
2222                     nop->nfso_stateid.other[0] = 0;
2223                     nop->nfso_stateid.other[1] = 0;
2224                     nop->nfso_stateid.other[2] = 0;
2225                     newnfs_copycred(&dp->nfsdl_cred, tcred);
2226                     newnfs_copyincred(tcred, &nop->nfso_cred);
2227                     tdp = NULL;
2228                     error = nfscl_tryopen(nmp, NULL, nop->nfso_fh,
2229                         nop->nfso_fhlen, nop->nfso_fh, nop->nfso_fhlen,
2230                         nop->nfso_mode, nop, NULL, 0, &tdp, 1,
2231                         delegtype, tcred, p);
2232                     if (tdp != NULL) {
2233                         if ((tdp->nfsdl_flags & NFSCLDL_WRITE))
2234                             mode = NFSV4OPEN_ACCESSWRITE;
2235                         else
2236                             mode = NFSV4OPEN_ACCESSREAD;
2237                         if ((nop->nfso_mode & mode) == mode &&
2238                             nop->nfso_fhlen == tdp->nfsdl_fhlen &&
2239                             !NFSBCMP(nop->nfso_fh, tdp->nfsdl_fh,
2240                             nop->nfso_fhlen)) {
2241                             dp->nfsdl_stateid = tdp->nfsdl_stateid;
2242                             dp->nfsdl_sizelimit = tdp->nfsdl_sizelimit;
2243                             dp->nfsdl_ace = tdp->nfsdl_ace;
2244                             dp->nfsdl_change = tdp->nfsdl_change;
2245                             dp->nfsdl_flags &= ~NFSCLDL_NEEDRECLAIM;
2246                             if ((tdp->nfsdl_flags & NFSCLDL_RECALL))
2247                                 dp->nfsdl_flags |= NFSCLDL_RECALL;
2248                             free(tdp, M_NFSCLDELEG);
2249                         } else {
2250                             TAILQ_INSERT_HEAD(&extra_deleg, tdp, nfsdl_list);
2251                         }
2252                     }
2253                 }
2254                 if (error) {
2255                     if (nop != NULL)
2256                         free(nop, M_NFSCLOPEN);
2257                     /*
2258                      * Couldn't reclaim it, so throw the state
2259                      * away. Ouch!!
2260                      */
2261                     nfscl_cleandeleg(dp);
2262                     nfscl_freedeleg(&clp->nfsc_deleg, dp, true);
2263                 } else {
2264                     LIST_INSERT_HEAD(&extra_open, nop, nfso_list);
2265                 }
2266             }
2267             dp = ndp;
2268         }
2269
2270         /*
2271          * Now, get rid of extra Opens and Delegations.
2272          */
2273         LIST_FOREACH_SAFE(op, &extra_open, nfso_list, nop) {
2274                 do {
2275                         newnfs_copycred(&op->nfso_cred, tcred);
2276                         error = nfscl_tryclose(op, tcred, nmp, p);
2277                         if (error == NFSERR_GRACE)
2278                                 (void) nfs_catnap(PZERO, error, "nfsexcls");
2279                 } while (error == NFSERR_GRACE);
2280                 LIST_REMOVE(op, nfso_list);
2281                 free(op, M_NFSCLOPEN);
2282         }
2283         if (nowp != NULL)
2284                 free(nowp, M_NFSCLOWNER);
2285
2286         TAILQ_FOREACH_SAFE(dp, &extra_deleg, nfsdl_list, ndp) {
2287                 do {
2288                         newnfs_copycred(&dp->nfsdl_cred, tcred);
2289                         error = nfscl_trydelegreturn(dp, tcred, nmp, p);
2290                         if (error == NFSERR_GRACE)
2291                                 (void) nfs_catnap(PZERO, error, "nfsexdlg");
2292                 } while (error == NFSERR_GRACE);
2293                 TAILQ_REMOVE(&extra_deleg, dp, nfsdl_list);
2294                 free(dp, M_NFSCLDELEG);
2295         }
2296
2297         /* For NFSv4.1 or later, do a RECLAIM_COMPLETE. */
2298         if (NFSHASNFSV4N(nmp))
2299                 (void)nfsrpc_reclaimcomplete(nmp, cred, p);
2300
2301 out:
2302         NFSLOCKCLSTATE();
2303         clp->nfsc_flags &= ~NFSCLFLAGS_RECVRINPROG;
2304         wakeup(&clp->nfsc_flags);
2305         nfsv4_unlock(&clp->nfsc_lock, 0);
2306         NFSUNLOCKCLSTATE();
2307         if (tcred != NULL)
2308                 NFSFREECRED(tcred);
2309 }
2310
2311 /*
2312  * This function is called when a server replies with NFSERR_EXPIRED.
2313  * It deletes all state for the client and does a fresh SetClientId/confirm.
2314  * XXX Someday it should post a signal to the process(es) that hold the
2315  * state, so they know that lock state has been lost.
2316  */
2317 int
2318 nfscl_hasexpired(struct nfsclclient *clp, u_int32_t clidrev, NFSPROC_T *p)
2319 {
2320         struct nfsmount *nmp;
2321         struct ucred *cred;
2322         int igotlock = 0, error, trycnt;
2323
2324         /*
2325          * If the clientid has gone away or a new SetClientid has already
2326          * been done, just return ok.
2327          */
2328         if (clp == NULL || clidrev != clp->nfsc_clientidrev)
2329                 return (0);
2330
2331         /*
2332          * First, lock the client structure, so everyone else will
2333          * block when trying to use state. Also, use NFSCLFLAGS_EXPIREIT so
2334          * that only one thread does the work.
2335          */
2336         NFSLOCKCLSTATE();
2337         clp->nfsc_flags |= NFSCLFLAGS_EXPIREIT;
2338         do {
2339                 igotlock = nfsv4_lock(&clp->nfsc_lock, 1, NULL,
2340                     NFSCLSTATEMUTEXPTR, NULL);
2341         } while (!igotlock && (clp->nfsc_flags & NFSCLFLAGS_EXPIREIT));
2342         if ((clp->nfsc_flags & NFSCLFLAGS_EXPIREIT) == 0) {
2343                 if (igotlock)
2344                         nfsv4_unlock(&clp->nfsc_lock, 0);
2345                 NFSUNLOCKCLSTATE();
2346                 return (0);
2347         }
2348         clp->nfsc_flags |= NFSCLFLAGS_RECVRINPROG;
2349         NFSUNLOCKCLSTATE();
2350
2351         nmp = clp->nfsc_nmp;
2352         if (nmp == NULL)
2353                 panic("nfscl expired");
2354         cred = newnfs_getcred();
2355         trycnt = 5;
2356         do {
2357                 error = nfsrpc_setclient(nmp, clp, 0, NULL, cred, p);
2358         } while ((error == NFSERR_STALECLIENTID ||
2359              error == NFSERR_BADSESSION ||
2360              error == NFSERR_STALEDONTRECOVER) && --trycnt > 0);
2361         if (error) {
2362                 NFSLOCKCLSTATE();
2363                 clp->nfsc_flags &= ~NFSCLFLAGS_RECOVER;
2364         } else {
2365                 /*
2366                  * Expire the state for the client.
2367                  */
2368                 nfscl_expireclient(clp, nmp, cred, p);
2369                 NFSLOCKCLSTATE();
2370                 clp->nfsc_flags |= NFSCLFLAGS_HASCLIENTID;
2371                 clp->nfsc_flags &= ~NFSCLFLAGS_RECOVER;
2372         }
2373         clp->nfsc_flags &= ~(NFSCLFLAGS_EXPIREIT | NFSCLFLAGS_RECVRINPROG);
2374         wakeup(&clp->nfsc_flags);
2375         nfsv4_unlock(&clp->nfsc_lock, 0);
2376         NFSUNLOCKCLSTATE();
2377         NFSFREECRED(cred);
2378         return (error);
2379 }
2380
2381 /*
2382  * This function inserts a lock in the list after insert_lop.
2383  */
2384 static void
2385 nfscl_insertlock(struct nfscllockowner *lp, struct nfscllock *new_lop,
2386     struct nfscllock *insert_lop, int local)
2387 {
2388
2389         if ((struct nfscllockowner *)insert_lop == lp)
2390                 LIST_INSERT_HEAD(&lp->nfsl_lock, new_lop, nfslo_list);
2391         else
2392                 LIST_INSERT_AFTER(insert_lop, new_lop, nfslo_list);
2393         if (local)
2394                 nfsstatsv1.cllocallocks++;
2395         else
2396                 nfsstatsv1.cllocks++;
2397 }
2398
2399 /*
2400  * This function updates the locking for a lock owner and given file. It
2401  * maintains a list of lock ranges ordered on increasing file offset that
2402  * are NFSCLLOCK_READ or NFSCLLOCK_WRITE and non-overlapping (aka POSIX style).
2403  * It always adds new_lop to the list and sometimes uses the one pointed
2404  * at by other_lopp.
2405  * Returns 1 if the locks were modified, 0 otherwise.
2406  */
2407 static int
2408 nfscl_updatelock(struct nfscllockowner *lp, struct nfscllock **new_lopp,
2409     struct nfscllock **other_lopp, int local)
2410 {
2411         struct nfscllock *new_lop = *new_lopp;
2412         struct nfscllock *lop, *tlop, *ilop;
2413         struct nfscllock *other_lop;
2414         int unlock = 0, modified = 0;
2415         u_int64_t tmp;
2416
2417         /*
2418          * Work down the list until the lock is merged.
2419          */
2420         if (new_lop->nfslo_type == F_UNLCK)
2421                 unlock = 1;
2422         ilop = (struct nfscllock *)lp;
2423         lop = LIST_FIRST(&lp->nfsl_lock);
2424         while (lop != NULL) {
2425             /*
2426              * Only check locks for this file that aren't before the start of
2427              * new lock's range.
2428              */
2429             if (lop->nfslo_end >= new_lop->nfslo_first) {
2430                 if (new_lop->nfslo_end < lop->nfslo_first) {
2431                     /*
2432                      * If the new lock ends before the start of the
2433                      * current lock's range, no merge, just insert
2434                      * the new lock.
2435                      */
2436                     break;
2437                 }
2438                 if (new_lop->nfslo_type == lop->nfslo_type ||
2439                     (new_lop->nfslo_first <= lop->nfslo_first &&
2440                      new_lop->nfslo_end >= lop->nfslo_end)) {
2441                     /*
2442                      * This lock can be absorbed by the new lock/unlock.
2443                      * This happens when it covers the entire range
2444                      * of the old lock or is contiguous
2445                      * with the old lock and is of the same type or an
2446                      * unlock.
2447                      */
2448                     if (new_lop->nfslo_type != lop->nfslo_type ||
2449                         new_lop->nfslo_first != lop->nfslo_first ||
2450                         new_lop->nfslo_end != lop->nfslo_end)
2451                         modified = 1;
2452                     if (lop->nfslo_first < new_lop->nfslo_first)
2453                         new_lop->nfslo_first = lop->nfslo_first;
2454                     if (lop->nfslo_end > new_lop->nfslo_end)
2455                         new_lop->nfslo_end = lop->nfslo_end;
2456                     tlop = lop;
2457                     lop = LIST_NEXT(lop, nfslo_list);
2458                     nfscl_freelock(tlop, local);
2459                     continue;
2460                 }
2461
2462                 /*
2463                  * All these cases are for contiguous locks that are not the
2464                  * same type, so they can't be merged.
2465                  */
2466                 if (new_lop->nfslo_first <= lop->nfslo_first) {
2467                     /*
2468                      * This case is where the new lock overlaps with the
2469                      * first part of the old lock. Move the start of the
2470                      * old lock to just past the end of the new lock. The
2471                      * new lock will be inserted in front of the old, since
2472                      * ilop hasn't been updated. (We are done now.)
2473                      */
2474                     if (lop->nfslo_first != new_lop->nfslo_end) {
2475                         lop->nfslo_first = new_lop->nfslo_end;
2476                         modified = 1;
2477                     }
2478                     break;
2479                 }
2480                 if (new_lop->nfslo_end >= lop->nfslo_end) {
2481                     /*
2482                      * This case is where the new lock overlaps with the
2483                      * end of the old lock's range. Move the old lock's
2484                      * end to just before the new lock's first and insert
2485                      * the new lock after the old lock.
2486                      * Might not be done yet, since the new lock could
2487                      * overlap further locks with higher ranges.
2488                      */
2489                     if (lop->nfslo_end != new_lop->nfslo_first) {
2490                         lop->nfslo_end = new_lop->nfslo_first;
2491                         modified = 1;
2492                     }
2493                     ilop = lop;
2494                     lop = LIST_NEXT(lop, nfslo_list);
2495                     continue;
2496                 }
2497                 /*
2498                  * The final case is where the new lock's range is in the
2499                  * middle of the current lock's and splits the current lock
2500                  * up. Use *other_lopp to handle the second part of the
2501                  * split old lock range. (We are done now.)
2502                  * For unlock, we use new_lop as other_lop and tmp, since
2503                  * other_lop and new_lop are the same for this case.
2504                  * We noted the unlock case above, so we don't need
2505                  * new_lop->nfslo_type any longer.
2506                  */
2507                 tmp = new_lop->nfslo_first;
2508                 if (unlock) {
2509                     other_lop = new_lop;
2510                     *new_lopp = NULL;
2511                 } else {
2512                     other_lop = *other_lopp;
2513                     *other_lopp = NULL;
2514                 }
2515                 other_lop->nfslo_first = new_lop->nfslo_end;
2516                 other_lop->nfslo_end = lop->nfslo_end;
2517                 other_lop->nfslo_type = lop->nfslo_type;
2518                 lop->nfslo_end = tmp;
2519                 nfscl_insertlock(lp, other_lop, lop, local);
2520                 ilop = lop;
2521                 modified = 1;
2522                 break;
2523             }
2524             ilop = lop;
2525             lop = LIST_NEXT(lop, nfslo_list);
2526             if (lop == NULL)
2527                 break;
2528         }
2529
2530         /*
2531          * Insert the new lock in the list at the appropriate place.
2532          */
2533         if (!unlock) {
2534                 nfscl_insertlock(lp, new_lop, ilop, local);
2535                 *new_lopp = NULL;
2536                 modified = 1;
2537         }
2538         return (modified);
2539 }
2540
2541 /*
2542  * This function must be run as a kernel thread.
2543  * It does Renew Ops and recovery, when required.
2544  */
2545 void
2546 nfscl_renewthread(struct nfsclclient *clp, NFSPROC_T *p)
2547 {
2548         struct nfsclowner *owp, *nowp;
2549         struct nfsclopen *op;
2550         struct nfscllockowner *lp, *nlp;
2551         struct nfscldeleghead dh;
2552         struct nfscldeleg *dp, *ndp;
2553         struct ucred *cred;
2554         u_int32_t clidrev;
2555         int error, cbpathdown, islept, igotlock, ret, clearok;
2556         uint32_t recover_done_time = 0;
2557         time_t mytime;
2558         static time_t prevsec = 0;
2559         struct nfscllockownerfh *lfhp, *nlfhp;
2560         struct nfscllockownerfhhead lfh;
2561         struct nfscllayout *lyp, *nlyp;
2562         struct nfscldevinfo *dip, *ndip;
2563         struct nfscllayouthead rlh;
2564         struct nfsclrecalllayout *recallp;
2565         struct nfsclds *dsp;
2566         bool retok;
2567         struct mount *mp;
2568         vnode_t vp;
2569
2570         cred = newnfs_getcred();
2571         NFSLOCKCLSTATE();
2572         clp->nfsc_flags |= NFSCLFLAGS_HASTHREAD;
2573         mp = clp->nfsc_nmp->nm_mountp;
2574         NFSUNLOCKCLSTATE();
2575         for(;;) {
2576                 newnfs_setroot(cred);
2577                 cbpathdown = 0;
2578                 if (clp->nfsc_flags & NFSCLFLAGS_RECOVER) {
2579                         /*
2580                          * Only allow one full recover within 1/2 of the lease
2581                          * duration (nfsc_renew).
2582                          * retok is value/result.  If passed in set to true,
2583                          * it indicates only a CreateSession operation should
2584                          * be attempted.
2585                          * If it is returned true, it indicates that the
2586                          * recovery only required a CreateSession.
2587                          */
2588                         retok = true;
2589                         if (recover_done_time < NFSD_MONOSEC) {
2590                                 recover_done_time = NFSD_MONOSEC +
2591                                     clp->nfsc_renew;
2592                                 retok = false;
2593                         }
2594                         NFSCL_DEBUG(1, "Doing recovery, only "
2595                             "createsession=%d\n", retok);
2596                         nfscl_recover(clp, &retok, cred, p);
2597                 }
2598                 if (clp->nfsc_expire <= NFSD_MONOSEC &&
2599                     (clp->nfsc_flags & NFSCLFLAGS_HASCLIENTID)) {
2600                         clp->nfsc_expire = NFSD_MONOSEC + clp->nfsc_renew;
2601                         clidrev = clp->nfsc_clientidrev;
2602                         error = nfsrpc_renew(clp, NULL, cred, p);
2603                         if (error == NFSERR_CBPATHDOWN)
2604                             cbpathdown = 1;
2605                         else if (error == NFSERR_STALECLIENTID ||
2606                             error == NFSERR_BADSESSION) {
2607                             NFSLOCKCLSTATE();
2608                             clp->nfsc_flags |= NFSCLFLAGS_RECOVER;
2609                             NFSUNLOCKCLSTATE();
2610                         } else if (error == NFSERR_EXPIRED)
2611                             (void) nfscl_hasexpired(clp, clidrev, p);
2612                 }
2613
2614 checkdsrenew:
2615                 if (NFSHASNFSV4N(clp->nfsc_nmp)) {
2616                         /* Do renews for any DS sessions. */
2617                         NFSLOCKMNT(clp->nfsc_nmp);
2618                         /* Skip first entry, since the MDS is handled above. */
2619                         dsp = TAILQ_FIRST(&clp->nfsc_nmp->nm_sess);
2620                         if (dsp != NULL)
2621                                 dsp = TAILQ_NEXT(dsp, nfsclds_list);
2622                         while (dsp != NULL) {
2623                                 if (dsp->nfsclds_expire <= NFSD_MONOSEC &&
2624                                     dsp->nfsclds_sess.nfsess_defunct == 0) {
2625                                         dsp->nfsclds_expire = NFSD_MONOSEC +
2626                                             clp->nfsc_renew;
2627                                         NFSUNLOCKMNT(clp->nfsc_nmp);
2628                                         (void)nfsrpc_renew(clp, dsp, cred, p);
2629                                         goto checkdsrenew;
2630                                 }
2631                                 dsp = TAILQ_NEXT(dsp, nfsclds_list);
2632                         }
2633                         NFSUNLOCKMNT(clp->nfsc_nmp);
2634                 }
2635
2636                 TAILQ_INIT(&dh);
2637                 NFSLOCKCLSTATE();
2638                 if (cbpathdown)
2639                         /* It's a Total Recall! */
2640                         nfscl_totalrecall(clp);
2641
2642                 /*
2643                  * Now, handle defunct owners.
2644                  */
2645                 LIST_FOREACH_SAFE(owp, &clp->nfsc_owner, nfsow_list, nowp) {
2646                         if (LIST_EMPTY(&owp->nfsow_open)) {
2647                                 if (owp->nfsow_defunct != 0)
2648                                         nfscl_freeopenowner(owp, 0);
2649                         }
2650                 }
2651
2652                 /*
2653                  * Do the recall on any delegations. To avoid trouble, always
2654                  * come back up here after having slept.
2655                  */
2656                 igotlock = 0;
2657 tryagain:
2658                 dp = TAILQ_FIRST(&clp->nfsc_deleg);
2659                 while (dp != NULL) {
2660                         ndp = TAILQ_NEXT(dp, nfsdl_list);
2661                         if ((dp->nfsdl_flags & NFSCLDL_RECALL)) {
2662                                 /*
2663                                  * Wait for outstanding I/O ops to be done.
2664                                  */
2665                                 if (dp->nfsdl_rwlock.nfslock_usecnt > 0) {
2666                                     if (igotlock) {
2667                                         nfsv4_unlock(&clp->nfsc_lock, 0);
2668                                         igotlock = 0;
2669                                     }
2670                                     dp->nfsdl_rwlock.nfslock_lock |=
2671                                         NFSV4LOCK_WANTED;
2672                                     msleep(&dp->nfsdl_rwlock,
2673                                         NFSCLSTATEMUTEXPTR, PVFS, "nfscld",
2674                                         5 * hz);
2675                                     if (NFSCL_FORCEDISM(mp))
2676                                         goto terminate;
2677                                     goto tryagain;
2678                                 }
2679                                 while (!igotlock) {
2680                                     igotlock = nfsv4_lock(&clp->nfsc_lock, 1,
2681                                         &islept, NFSCLSTATEMUTEXPTR, mp);
2682                                     if (igotlock == 0 && NFSCL_FORCEDISM(mp))
2683                                         goto terminate;
2684                                     if (islept)
2685                                         goto tryagain;
2686                                 }
2687                                 NFSUNLOCKCLSTATE();
2688                                 newnfs_copycred(&dp->nfsdl_cred, cred);
2689                                 ret = nfscl_recalldeleg(clp, clp->nfsc_nmp, dp,
2690                                     NULL, cred, p, 1, &vp);
2691                                 if (!ret) {
2692                                     nfscl_cleandeleg(dp);
2693                                     TAILQ_REMOVE(&clp->nfsc_deleg, dp,
2694                                         nfsdl_list);
2695                                     LIST_REMOVE(dp, nfsdl_hash);
2696                                     TAILQ_INSERT_HEAD(&dh, dp, nfsdl_list);
2697                                     nfscl_delegcnt--;
2698                                     nfsstatsv1.cldelegates--;
2699                                 }
2700                                 NFSLOCKCLSTATE();
2701                                 /*
2702                                  * The nfsc_lock must be released before doing
2703                                  * vrele(), since it might call nfs_inactive().
2704                                  * For the unlikely case where the vnode failed
2705                                  * to be acquired by nfscl_recalldeleg(), a
2706                                  * VOP_RECLAIM() should be in progress and it
2707                                  * will return the delegation.
2708                                  */
2709                                 nfsv4_unlock(&clp->nfsc_lock, 0);
2710                                 igotlock = 0;
2711                                 if (vp != NULL) {
2712                                         NFSUNLOCKCLSTATE();
2713                                         vrele(vp);
2714                                         NFSLOCKCLSTATE();
2715                                 }
2716                                 goto tryagain;
2717                         }
2718                         dp = ndp;
2719                 }
2720
2721                 /*
2722                  * Clear out old delegations, if we are above the high water
2723                  * mark. Only clear out ones with no state related to them.
2724                  * The tailq list is in LRU order.
2725                  */
2726                 dp = TAILQ_LAST(&clp->nfsc_deleg, nfscldeleghead);
2727                 while (nfscl_delegcnt > nfscl_deleghighwater && dp != NULL) {
2728                     ndp = TAILQ_PREV(dp, nfscldeleghead, nfsdl_list);
2729                     if (dp->nfsdl_rwlock.nfslock_usecnt == 0 &&
2730                         dp->nfsdl_rwlock.nfslock_lock == 0 &&
2731                         dp->nfsdl_timestamp < NFSD_MONOSEC &&
2732                         (dp->nfsdl_flags & (NFSCLDL_RECALL | NFSCLDL_ZAPPED |
2733                           NFSCLDL_NEEDRECLAIM | NFSCLDL_DELEGRET)) == 0) {
2734                         clearok = 1;
2735                         LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
2736                             op = LIST_FIRST(&owp->nfsow_open);
2737                             if (op != NULL) {
2738                                 clearok = 0;
2739                                 break;
2740                             }
2741                         }
2742                         if (clearok) {
2743                             LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
2744                                 if (!LIST_EMPTY(&lp->nfsl_lock)) {
2745                                     clearok = 0;
2746                                     break;
2747                                 }
2748                             }
2749                         }
2750                         if (clearok) {
2751                             TAILQ_REMOVE(&clp->nfsc_deleg, dp, nfsdl_list);
2752                             LIST_REMOVE(dp, nfsdl_hash);
2753                             TAILQ_INSERT_HEAD(&dh, dp, nfsdl_list);
2754                             nfscl_delegcnt--;
2755                             nfsstatsv1.cldelegates--;
2756                         }
2757                     }
2758                     dp = ndp;
2759                 }
2760                 if (igotlock)
2761                         nfsv4_unlock(&clp->nfsc_lock, 0);
2762
2763                 /*
2764                  * Do the recall on any layouts. To avoid trouble, always
2765                  * come back up here after having slept.
2766                  */
2767                 TAILQ_INIT(&rlh);
2768 tryagain2:
2769                 TAILQ_FOREACH_SAFE(lyp, &clp->nfsc_layout, nfsly_list, nlyp) {
2770                         if ((lyp->nfsly_flags & NFSLY_RECALL) != 0) {
2771                                 /*
2772                                  * Wait for outstanding I/O ops to be done.
2773                                  */
2774                                 if (lyp->nfsly_lock.nfslock_usecnt > 0 ||
2775                                     (lyp->nfsly_lock.nfslock_lock &
2776                                      NFSV4LOCK_LOCK) != 0) {
2777                                         lyp->nfsly_lock.nfslock_lock |=
2778                                             NFSV4LOCK_WANTED;
2779                                         msleep(&lyp->nfsly_lock.nfslock_lock,
2780                                             NFSCLSTATEMUTEXPTR, PVFS, "nfslyp",
2781                                             5 * hz);
2782                                         if (NFSCL_FORCEDISM(mp))
2783                                             goto terminate;
2784                                         goto tryagain2;
2785                                 }
2786                                 /* Move the layout to the recall list. */
2787                                 TAILQ_REMOVE(&clp->nfsc_layout, lyp,
2788                                     nfsly_list);
2789                                 LIST_REMOVE(lyp, nfsly_hash);
2790                                 TAILQ_INSERT_HEAD(&rlh, lyp, nfsly_list);
2791
2792                                 /* Handle any layout commits. */
2793                                 if (!NFSHASNOLAYOUTCOMMIT(clp->nfsc_nmp) &&
2794                                     (lyp->nfsly_flags & NFSLY_WRITTEN) != 0) {
2795                                         lyp->nfsly_flags &= ~NFSLY_WRITTEN;
2796                                         NFSUNLOCKCLSTATE();
2797                                         NFSCL_DEBUG(3, "do layoutcommit\n");
2798                                         nfscl_dolayoutcommit(clp->nfsc_nmp, lyp,
2799                                             cred, p);
2800                                         NFSLOCKCLSTATE();
2801                                         goto tryagain2;
2802                                 }
2803                         }
2804                 }
2805
2806                 /* Now, look for stale layouts. */
2807                 lyp = TAILQ_LAST(&clp->nfsc_layout, nfscllayouthead);
2808                 while (lyp != NULL) {
2809                         nlyp = TAILQ_PREV(lyp, nfscllayouthead, nfsly_list);
2810                         if (lyp->nfsly_timestamp < NFSD_MONOSEC &&
2811                             (lyp->nfsly_flags & NFSLY_RECALL) == 0 &&
2812                             lyp->nfsly_lock.nfslock_usecnt == 0 &&
2813                             lyp->nfsly_lock.nfslock_lock == 0) {
2814                                 NFSCL_DEBUG(4, "ret stale lay=%d\n",
2815                                     nfscl_layoutcnt);
2816                                 recallp = malloc(sizeof(*recallp),
2817                                     M_NFSLAYRECALL, M_NOWAIT);
2818                                 if (recallp == NULL)
2819                                         break;
2820                                 (void)nfscl_layoutrecall(NFSLAYOUTRETURN_FILE,
2821                                     lyp, NFSLAYOUTIOMODE_ANY, 0, UINT64_MAX,
2822                                     lyp->nfsly_stateid.seqid, 0, 0, NULL,
2823                                     recallp);
2824                         }
2825                         lyp = nlyp;
2826                 }
2827
2828                 /*
2829                  * Free up any unreferenced device info structures.
2830                  */
2831                 LIST_FOREACH_SAFE(dip, &clp->nfsc_devinfo, nfsdi_list, ndip) {
2832                         if (dip->nfsdi_layoutrefs == 0 &&
2833                             dip->nfsdi_refcnt == 0) {
2834                                 NFSCL_DEBUG(4, "freeing devinfo\n");
2835                                 LIST_REMOVE(dip, nfsdi_list);
2836                                 nfscl_freedevinfo(dip);
2837                         }
2838                 }
2839                 NFSUNLOCKCLSTATE();
2840
2841                 /* Do layout return(s), as required. */
2842                 TAILQ_FOREACH_SAFE(lyp, &rlh, nfsly_list, nlyp) {
2843                         TAILQ_REMOVE(&rlh, lyp, nfsly_list);
2844                         NFSCL_DEBUG(4, "ret layout\n");
2845                         nfscl_layoutreturn(clp->nfsc_nmp, lyp, cred, p);
2846                         nfscl_freelayout(lyp);
2847                 }
2848
2849                 /*
2850                  * Delegreturn any delegations cleaned out or recalled.
2851                  */
2852                 TAILQ_FOREACH_SAFE(dp, &dh, nfsdl_list, ndp) {
2853                         newnfs_copycred(&dp->nfsdl_cred, cred);
2854                         (void) nfscl_trydelegreturn(dp, cred, clp->nfsc_nmp, p);
2855                         TAILQ_REMOVE(&dh, dp, nfsdl_list);
2856                         free(dp, M_NFSCLDELEG);
2857                 }
2858
2859                 SLIST_INIT(&lfh);
2860                 /*
2861                  * Call nfscl_cleanupkext() once per second to check for
2862                  * open/lock owners where the process has exited.
2863                  */
2864                 mytime = NFSD_MONOSEC;
2865                 if (prevsec != mytime) {
2866                         prevsec = mytime;
2867                         nfscl_cleanupkext(clp, &lfh);
2868                 }
2869
2870                 /*
2871                  * Do a ReleaseLockOwner for all lock owners where the
2872                  * associated process no longer exists, as found by
2873                  * nfscl_cleanupkext().
2874                  */
2875                 newnfs_setroot(cred);
2876                 SLIST_FOREACH_SAFE(lfhp, &lfh, nfslfh_list, nlfhp) {
2877                         LIST_FOREACH_SAFE(lp, &lfhp->nfslfh_lock, nfsl_list,
2878                             nlp) {
2879                                 (void)nfsrpc_rellockown(clp->nfsc_nmp, lp,
2880                                     lfhp->nfslfh_fh, lfhp->nfslfh_len, cred,
2881                                     p);
2882                                 nfscl_freelockowner(lp, 0);
2883                         }
2884                         free(lfhp, M_TEMP);
2885                 }
2886                 SLIST_INIT(&lfh);
2887
2888                 NFSLOCKCLSTATE();
2889                 if ((clp->nfsc_flags & NFSCLFLAGS_RECOVER) == 0)
2890                         (void)mtx_sleep(clp, NFSCLSTATEMUTEXPTR, PWAIT, "nfscl",
2891                             hz);
2892 terminate:
2893                 if (clp->nfsc_flags & NFSCLFLAGS_UMOUNT) {
2894                         clp->nfsc_flags &= ~NFSCLFLAGS_HASTHREAD;
2895                         NFSUNLOCKCLSTATE();
2896                         NFSFREECRED(cred);
2897                         wakeup((caddr_t)clp);
2898                         return;
2899                 }
2900                 NFSUNLOCKCLSTATE();
2901         }
2902 }
2903
2904 /*
2905  * Initiate state recovery. Called when NFSERR_STALECLIENTID,
2906  * NFSERR_STALESTATEID or NFSERR_BADSESSION is received.
2907  */
2908 void
2909 nfscl_initiate_recovery(struct nfsclclient *clp)
2910 {
2911
2912         if (clp == NULL)
2913                 return;
2914         NFSLOCKCLSTATE();
2915         clp->nfsc_flags |= NFSCLFLAGS_RECOVER;
2916         NFSUNLOCKCLSTATE();
2917         wakeup((caddr_t)clp);
2918 }
2919
2920 /*
2921  * Dump out the state stuff for debugging.
2922  */
2923 void
2924 nfscl_dumpstate(struct nfsmount *nmp, int openowner, int opens,
2925     int lockowner, int locks)
2926 {
2927         struct nfsclclient *clp;
2928         struct nfsclowner *owp;
2929         struct nfsclopen *op;
2930         struct nfscllockowner *lp;
2931         struct nfscllock *lop;
2932         struct nfscldeleg *dp;
2933
2934         clp = nmp->nm_clp;
2935         if (clp == NULL) {
2936                 printf("nfscl dumpstate NULL clp\n");
2937                 return;
2938         }
2939         NFSLOCKCLSTATE();
2940         TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
2941           LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
2942             if (openowner && !LIST_EMPTY(&owp->nfsow_open))
2943                 printf("owner=0x%x 0x%x 0x%x 0x%x seqid=%d\n",
2944                     owp->nfsow_owner[0], owp->nfsow_owner[1],
2945                     owp->nfsow_owner[2], owp->nfsow_owner[3],
2946                     owp->nfsow_seqid);
2947             LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
2948                 if (opens)
2949                     printf("open st=0x%x 0x%x 0x%x cnt=%d fh12=0x%x\n",
2950                         op->nfso_stateid.other[0], op->nfso_stateid.other[1],
2951                         op->nfso_stateid.other[2], op->nfso_opencnt,
2952                         op->nfso_fh[12]);
2953                 LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
2954                     if (lockowner)
2955                         printf("lckown=0x%x 0x%x 0x%x 0x%x seqid=%d st=0x%x 0x%x 0x%x\n",
2956                             lp->nfsl_owner[0], lp->nfsl_owner[1],
2957                             lp->nfsl_owner[2], lp->nfsl_owner[3],
2958                             lp->nfsl_seqid,
2959                             lp->nfsl_stateid.other[0], lp->nfsl_stateid.other[1],
2960                             lp->nfsl_stateid.other[2]);
2961                     LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
2962                         if (locks)
2963 #ifdef __FreeBSD__
2964                             printf("lck typ=%d fst=%ju end=%ju\n",
2965                                 lop->nfslo_type, (intmax_t)lop->nfslo_first,
2966                                 (intmax_t)lop->nfslo_end);
2967 #else
2968                             printf("lck typ=%d fst=%qd end=%qd\n",
2969                                 lop->nfslo_type, lop->nfslo_first,
2970                                 lop->nfslo_end);
2971 #endif
2972                     }
2973                 }
2974             }
2975           }
2976         }
2977         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
2978             if (openowner && !LIST_EMPTY(&owp->nfsow_open))
2979                 printf("owner=0x%x 0x%x 0x%x 0x%x seqid=%d\n",
2980                     owp->nfsow_owner[0], owp->nfsow_owner[1],
2981                     owp->nfsow_owner[2], owp->nfsow_owner[3],
2982                     owp->nfsow_seqid);
2983             LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
2984                 if (opens)
2985                     printf("open st=0x%x 0x%x 0x%x cnt=%d fh12=0x%x\n",
2986                         op->nfso_stateid.other[0], op->nfso_stateid.other[1],
2987                         op->nfso_stateid.other[2], op->nfso_opencnt,
2988                         op->nfso_fh[12]);
2989                 LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
2990                     if (lockowner)
2991                         printf("lckown=0x%x 0x%x 0x%x 0x%x seqid=%d st=0x%x 0x%x 0x%x\n",
2992                             lp->nfsl_owner[0], lp->nfsl_owner[1],
2993                             lp->nfsl_owner[2], lp->nfsl_owner[3],
2994                             lp->nfsl_seqid,
2995                             lp->nfsl_stateid.other[0], lp->nfsl_stateid.other[1],
2996                             lp->nfsl_stateid.other[2]);
2997                     LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
2998                         if (locks)
2999 #ifdef __FreeBSD__
3000                             printf("lck typ=%d fst=%ju end=%ju\n",
3001                                 lop->nfslo_type, (intmax_t)lop->nfslo_first,
3002                                 (intmax_t)lop->nfslo_end);
3003 #else
3004                             printf("lck typ=%d fst=%qd end=%qd\n",
3005                                 lop->nfslo_type, lop->nfslo_first,
3006                                 lop->nfslo_end);
3007 #endif
3008                     }
3009                 }
3010             }
3011         }
3012         NFSUNLOCKCLSTATE();
3013 }
3014
3015 /*
3016  * Check for duplicate open owners and opens.
3017  * (Only used as a diagnostic aid.)
3018  */
3019 void
3020 nfscl_dupopen(vnode_t vp, int dupopens)
3021 {
3022         struct nfsclclient *clp;
3023         struct nfsclowner *owp, *owp2;
3024         struct nfsclopen *op, *op2;
3025         struct nfsfh *nfhp;
3026
3027         clp = VFSTONFS(vp->v_mount)->nm_clp;
3028         if (clp == NULL) {
3029                 printf("nfscl dupopen NULL clp\n");
3030                 return;
3031         }
3032         nfhp = VTONFS(vp)->n_fhp;
3033         NFSLOCKCLSTATE();
3034
3035         /*
3036          * First, search for duplicate owners.
3037          * These should never happen!
3038          */
3039         LIST_FOREACH(owp2, &clp->nfsc_owner, nfsow_list) {
3040             LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
3041                 if (owp != owp2 &&
3042                     !NFSBCMP(owp->nfsow_owner, owp2->nfsow_owner,
3043                     NFSV4CL_LOCKNAMELEN)) {
3044                         NFSUNLOCKCLSTATE();
3045                         printf("DUP OWNER\n");
3046                         nfscl_dumpstate(VFSTONFS(vp->v_mount), 1, 1, 0, 0);
3047                         return;
3048                 }
3049             }
3050         }
3051
3052         /*
3053          * Now, search for duplicate stateids.
3054          * These shouldn't happen, either.
3055          */
3056         LIST_FOREACH(owp2, &clp->nfsc_owner, nfsow_list) {
3057             LIST_FOREACH(op2, &owp2->nfsow_open, nfso_list) {
3058                 LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
3059                     LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
3060                         if (op != op2 &&
3061                             (op->nfso_stateid.other[0] != 0 ||
3062                              op->nfso_stateid.other[1] != 0 ||
3063                              op->nfso_stateid.other[2] != 0) &&
3064                             op->nfso_stateid.other[0] == op2->nfso_stateid.other[0] &&
3065                             op->nfso_stateid.other[1] == op2->nfso_stateid.other[1] &&
3066                             op->nfso_stateid.other[2] == op2->nfso_stateid.other[2]) {
3067                             NFSUNLOCKCLSTATE();
3068                             printf("DUP STATEID\n");
3069                             nfscl_dumpstate(VFSTONFS(vp->v_mount), 1, 1, 0, 0);
3070                             return;
3071                         }
3072                     }
3073                 }
3074             }
3075         }
3076
3077         /*
3078          * Now search for duplicate opens.
3079          * Duplicate opens for the same owner
3080          * should never occur. Other duplicates are
3081          * possible and are checked for if "dupopens"
3082          * is true.
3083          */
3084         LIST_FOREACH(owp2, &clp->nfsc_owner, nfsow_list) {
3085             LIST_FOREACH(op2, &owp2->nfsow_open, nfso_list) {
3086                 if (nfhp->nfh_len == op2->nfso_fhlen &&
3087                     !NFSBCMP(nfhp->nfh_fh, op2->nfso_fh, nfhp->nfh_len)) {
3088                     LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
3089                         LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
3090                             if (op != op2 && nfhp->nfh_len == op->nfso_fhlen &&
3091                                 !NFSBCMP(nfhp->nfh_fh, op->nfso_fh, nfhp->nfh_len) &&
3092                                 (!NFSBCMP(op->nfso_own->nfsow_owner,
3093                                  op2->nfso_own->nfsow_owner, NFSV4CL_LOCKNAMELEN) ||
3094                                  dupopens)) {
3095                                 if (!NFSBCMP(op->nfso_own->nfsow_owner,
3096                                     op2->nfso_own->nfsow_owner, NFSV4CL_LOCKNAMELEN)) {
3097                                     NFSUNLOCKCLSTATE();
3098                                     printf("BADDUP OPEN\n");
3099                                 } else {
3100                                     NFSUNLOCKCLSTATE();
3101                                     printf("DUP OPEN\n");
3102                                 }
3103                                 nfscl_dumpstate(VFSTONFS(vp->v_mount), 1, 1, 0,
3104                                     0);
3105                                 return;
3106                             }
3107                         }
3108                     }
3109                 }
3110             }
3111         }
3112         NFSUNLOCKCLSTATE();
3113 }
3114
3115 /*
3116  * During close, find an open that needs to be dereferenced and
3117  * dereference it. If there are no more opens for this file,
3118  * log a message to that effect.
3119  * Opens aren't actually Close'd until VOP_INACTIVE() is performed
3120  * on the file's vnode.
3121  * This is the safe way, since it is difficult to identify
3122  * which open the close is for and I/O can be performed after the
3123  * close(2) system call when a file is mmap'd.
3124  * If it returns 0 for success, there will be a referenced
3125  * clp returned via clpp.
3126  */
3127 int
3128 nfscl_getclose(vnode_t vp, struct nfsclclient **clpp)
3129 {
3130         struct nfsclclient *clp;
3131         struct nfsclowner *owp;
3132         struct nfsclopen *op;
3133         struct nfscldeleg *dp;
3134         struct nfsfh *nfhp;
3135         int error, notdecr;
3136
3137         error = nfscl_getcl(vp->v_mount, NULL, NULL, 1, &clp);
3138         if (error)
3139                 return (error);
3140         *clpp = clp;
3141
3142         nfhp = VTONFS(vp)->n_fhp;
3143         notdecr = 1;
3144         NFSLOCKCLSTATE();
3145         /*
3146          * First, look for one under a delegation that was locally issued
3147          * and just decrement the opencnt for it. Since all my Opens against
3148          * the server are DENY_NONE, I don't see a problem with hanging
3149          * onto them. (It is much easier to use one of the extant Opens
3150          * that I already have on the server when a Delegation is recalled
3151          * than to do fresh Opens.) Someday, I might need to rethink this, but.
3152          */
3153         dp = nfscl_finddeleg(clp, nfhp->nfh_fh, nfhp->nfh_len);
3154         if (dp != NULL) {
3155                 LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
3156                         op = LIST_FIRST(&owp->nfsow_open);
3157                         if (op != NULL) {
3158                                 /*
3159                                  * Since a delegation is for a file, there
3160                                  * should never be more than one open for
3161                                  * each openowner.
3162                                  */
3163                                 if (LIST_NEXT(op, nfso_list) != NULL)
3164                                         panic("nfscdeleg opens");
3165                                 if (notdecr && op->nfso_opencnt > 0) {
3166                                         notdecr = 0;
3167                                         op->nfso_opencnt--;
3168                                         break;
3169                                 }
3170                         }
3171                 }
3172         }
3173
3174         /* Now process the opens against the server. */
3175         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
3176                 LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
3177                         if (op->nfso_fhlen == nfhp->nfh_len &&
3178                             !NFSBCMP(op->nfso_fh, nfhp->nfh_fh,
3179                             nfhp->nfh_len)) {
3180                                 /* Found an open, decrement cnt if possible */
3181                                 if (notdecr && op->nfso_opencnt > 0) {
3182                                         notdecr = 0;
3183                                         op->nfso_opencnt--;
3184                                 }
3185                                 /*
3186                                  * There are more opens, so just return.
3187                                  */
3188                                 if (op->nfso_opencnt > 0) {
3189                                         NFSUNLOCKCLSTATE();
3190                                         return (0);
3191                                 }
3192                         }
3193                 }
3194         }
3195         NFSUNLOCKCLSTATE();
3196         if (notdecr)
3197                 printf("nfscl: never fnd open\n");
3198         return (0);
3199 }
3200
3201 int
3202 nfscl_doclose(vnode_t vp, struct nfsclclient **clpp, NFSPROC_T *p)
3203 {
3204         struct nfsclclient *clp;
3205         struct nfsclowner *owp, *nowp;
3206         struct nfsclopen *op;
3207         struct nfscldeleg *dp;
3208         struct nfsfh *nfhp;
3209         struct nfsclrecalllayout *recallp;
3210         int error;
3211
3212         error = nfscl_getcl(vp->v_mount, NULL, NULL, 1, &clp);
3213         if (error)
3214                 return (error);
3215         *clpp = clp;
3216
3217         nfhp = VTONFS(vp)->n_fhp;
3218         recallp = malloc(sizeof(*recallp), M_NFSLAYRECALL, M_WAITOK);
3219         NFSLOCKCLSTATE();
3220         /*
3221          * First get rid of the local Open structures, which should be no
3222          * longer in use.
3223          */
3224         dp = nfscl_finddeleg(clp, nfhp->nfh_fh, nfhp->nfh_len);
3225         if (dp != NULL) {
3226                 LIST_FOREACH_SAFE(owp, &dp->nfsdl_owner, nfsow_list, nowp) {
3227                         op = LIST_FIRST(&owp->nfsow_open);
3228                         if (op != NULL) {
3229                                 KASSERT((op->nfso_opencnt == 0),
3230                                     ("nfscl: bad open cnt on deleg"));
3231                                 nfscl_freeopen(op, 1);
3232                         }
3233                         nfscl_freeopenowner(owp, 1);
3234                 }
3235         }
3236
3237         /* Return any layouts marked return on close. */
3238         nfscl_retoncloselayout(vp, clp, nfhp->nfh_fh, nfhp->nfh_len, &recallp);
3239
3240         /* Now process the opens against the server. */
3241 lookformore:
3242         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
3243                 op = LIST_FIRST(&owp->nfsow_open);
3244                 while (op != NULL) {
3245                         if (op->nfso_fhlen == nfhp->nfh_len &&
3246                             !NFSBCMP(op->nfso_fh, nfhp->nfh_fh,
3247                             nfhp->nfh_len)) {
3248                                 /* Found an open, close it. */
3249 #ifdef DIAGNOSTIC
3250                                 KASSERT((op->nfso_opencnt == 0),
3251                                     ("nfscl: bad open cnt on server (%d)",
3252                                      op->nfso_opencnt));
3253 #endif
3254                                 NFSUNLOCKCLSTATE();
3255                                 nfsrpc_doclose(VFSTONFS(vp->v_mount), op, p);
3256                                 NFSLOCKCLSTATE();
3257                                 goto lookformore;
3258                         }
3259                         op = LIST_NEXT(op, nfso_list);
3260                 }
3261         }
3262         NFSUNLOCKCLSTATE();
3263         /*
3264          * recallp has been set NULL by nfscl_retoncloselayout() if it was
3265          * used by the function, but calling free() with a NULL pointer is ok.
3266          */
3267         free(recallp, M_NFSLAYRECALL);
3268         return (0);
3269 }
3270
3271 /*
3272  * Return all delegations on this client.
3273  * (Must be called with client sleep lock.)
3274  */
3275 static void
3276 nfscl_delegreturnall(struct nfsclclient *clp, NFSPROC_T *p)
3277 {
3278         struct nfscldeleg *dp, *ndp;
3279         struct ucred *cred;
3280
3281         cred = newnfs_getcred();
3282         TAILQ_FOREACH_SAFE(dp, &clp->nfsc_deleg, nfsdl_list, ndp) {
3283                 nfscl_cleandeleg(dp);
3284                 (void) nfscl_trydelegreturn(dp, cred, clp->nfsc_nmp, p);
3285                 nfscl_freedeleg(&clp->nfsc_deleg, dp, true);
3286         }
3287         NFSFREECRED(cred);
3288 }
3289
3290 /*
3291  * Return any delegation for this vp.
3292  */
3293 void
3294 nfscl_delegreturnvp(vnode_t vp, NFSPROC_T *p)
3295 {
3296         struct nfsclclient *clp;
3297         struct nfscldeleg *dp;
3298         struct ucred *cred;
3299         struct nfsnode *np;
3300
3301         np = VTONFS(vp);
3302         cred = newnfs_getcred();
3303         dp = NULL;
3304         NFSLOCKCLSTATE();
3305         clp = VFSTONFS(vp->v_mount)->nm_clp;
3306         if (clp != NULL)
3307                 dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh,
3308                     np->n_fhp->nfh_len);
3309         if (dp != NULL) {
3310                 nfscl_cleandeleg(dp);
3311                 nfscl_freedeleg(&clp->nfsc_deleg, dp, false);
3312                 NFSUNLOCKCLSTATE();
3313                 newnfs_copycred(&dp->nfsdl_cred, cred);
3314                 nfscl_trydelegreturn(dp, cred, clp->nfsc_nmp, p);
3315                 free(dp, M_NFSCLDELEG);
3316         } else
3317                 NFSUNLOCKCLSTATE();
3318         NFSFREECRED(cred);
3319 }
3320
3321 /*
3322  * Do a callback RPC.
3323  */
3324 void
3325 nfscl_docb(struct nfsrv_descript *nd, NFSPROC_T *p)
3326 {
3327         int clist, gotseq_ok, i, j, k, op, rcalls;
3328         u_int32_t *tl;
3329         struct nfsclclient *clp;
3330         struct nfscldeleg *dp = NULL;
3331         int numops, taglen = -1, error = 0, trunc __unused;
3332         u_int32_t minorvers = 0, retops = 0, *retopsp = NULL, *repp, cbident;
3333         u_char tag[NFSV4_SMALLSTR + 1], *tagstr;
3334         vnode_t vp = NULL;
3335         struct nfsnode *np;
3336         struct vattr va;
3337         struct nfsfh *nfhp;
3338         mount_t mp;
3339         nfsattrbit_t attrbits, rattrbits;
3340         nfsv4stateid_t stateid;
3341         uint32_t seqid, slotid = 0, highslot, cachethis __unused;
3342         uint8_t sessionid[NFSX_V4SESSIONID];
3343         struct mbuf *rep;
3344         struct nfscllayout *lyp;
3345         uint64_t filesid[2], len, off;
3346         int changed, gotone, laytype, recalltype;
3347         uint32_t iomode;
3348         struct nfsclrecalllayout *recallp = NULL;
3349         struct nfsclsession *tsep;
3350
3351         gotseq_ok = 0;
3352         nfsrvd_rephead(nd);
3353         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
3354         taglen = fxdr_unsigned(int, *tl);
3355         if (taglen < 0) {
3356                 error = EBADRPC;
3357                 goto nfsmout;
3358         }
3359         if (taglen <= NFSV4_SMALLSTR)
3360                 tagstr = tag;
3361         else
3362                 tagstr = malloc(taglen + 1, M_TEMP, M_WAITOK);
3363         error = nfsrv_mtostr(nd, tagstr, taglen);
3364         if (error) {
3365                 if (taglen > NFSV4_SMALLSTR)
3366                         free(tagstr, M_TEMP);
3367                 taglen = -1;
3368                 goto nfsmout;
3369         }
3370         (void) nfsm_strtom(nd, tag, taglen);
3371         if (taglen > NFSV4_SMALLSTR) {
3372                 free(tagstr, M_TEMP);
3373         }
3374         NFSM_BUILD(retopsp, u_int32_t *, NFSX_UNSIGNED);
3375         NFSM_DISSECT(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
3376         minorvers = fxdr_unsigned(u_int32_t, *tl++);
3377         if (minorvers != NFSV4_MINORVERSION &&
3378             minorvers != NFSV41_MINORVERSION &&
3379             minorvers != NFSV42_MINORVERSION)
3380                 nd->nd_repstat = NFSERR_MINORVERMISMATCH;
3381         cbident = fxdr_unsigned(u_int32_t, *tl++);
3382         if (nd->nd_repstat)
3383                 numops = 0;
3384         else
3385                 numops = fxdr_unsigned(int, *tl);
3386         /*
3387          * Loop around doing the sub ops.
3388          */
3389         for (i = 0; i < numops; i++) {
3390                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
3391                 NFSM_BUILD(repp, u_int32_t *, 2 * NFSX_UNSIGNED);
3392                 *repp++ = *tl;
3393                 op = fxdr_unsigned(int, *tl);
3394                 if (op < NFSV4OP_CBGETATTR ||
3395                    (op > NFSV4OP_CBRECALL && minorvers == NFSV4_MINORVERSION) ||
3396                    (op > NFSV4OP_CBNOTIFYDEVID &&
3397                     minorvers == NFSV41_MINORVERSION) ||
3398                    (op > NFSV4OP_CBOFFLOAD &&
3399                     minorvers == NFSV42_MINORVERSION)) {
3400                     nd->nd_repstat = NFSERR_OPILLEGAL;
3401                     *repp = nfscl_errmap(nd, minorvers);
3402                     retops++;
3403                     break;
3404                 }
3405                 nd->nd_procnum = op;
3406                 if (op < NFSV42_CBNOPS)
3407                         nfsstatsv1.cbrpccnt[nd->nd_procnum]++;
3408                 switch (op) {
3409                 case NFSV4OP_CBGETATTR:
3410                         NFSCL_DEBUG(4, "cbgetattr\n");
3411                         mp = NULL;
3412                         vp = NULL;
3413                         error = nfsm_getfh(nd, &nfhp);
3414                         if (!error)
3415                                 error = nfsrv_getattrbits(nd, &attrbits,
3416                                     NULL, NULL);
3417                         if (error == 0 && i == 0 &&
3418                             minorvers != NFSV4_MINORVERSION)
3419                                 error = NFSERR_OPNOTINSESS;
3420                         if (!error) {
3421                                 mp = nfscl_getmnt(minorvers, sessionid, cbident,
3422                                     &clp);
3423                                 if (mp == NULL)
3424                                         error = NFSERR_SERVERFAULT;
3425                         }
3426                         if (!error) {
3427                                 error = nfscl_ngetreopen(mp, nfhp->nfh_fh,
3428                                     nfhp->nfh_len, p, &np);
3429                                 if (!error)
3430                                         vp = NFSTOV(np);
3431                         }
3432                         if (!error) {
3433                                 NFSZERO_ATTRBIT(&rattrbits);
3434                                 NFSLOCKCLSTATE();
3435                                 dp = nfscl_finddeleg(clp, nfhp->nfh_fh,
3436                                     nfhp->nfh_len);
3437                                 if (dp != NULL) {
3438                                         if (NFSISSET_ATTRBIT(&attrbits,
3439                                             NFSATTRBIT_SIZE)) {
3440                                                 if (vp != NULL)
3441                                                         va.va_size = np->n_size;
3442                                                 else
3443                                                         va.va_size =
3444                                                             dp->nfsdl_size;
3445                                                 NFSSETBIT_ATTRBIT(&rattrbits,
3446                                                     NFSATTRBIT_SIZE);
3447                                         }
3448                                         if (NFSISSET_ATTRBIT(&attrbits,
3449                                             NFSATTRBIT_CHANGE)) {
3450                                                 va.va_filerev =
3451                                                     dp->nfsdl_change;
3452                                                 if (vp == NULL ||
3453                                                     (np->n_flag & NDELEGMOD))
3454                                                         va.va_filerev++;
3455                                                 NFSSETBIT_ATTRBIT(&rattrbits,
3456                                                     NFSATTRBIT_CHANGE);
3457                                         }
3458                                 } else
3459                                         error = NFSERR_SERVERFAULT;
3460                                 NFSUNLOCKCLSTATE();
3461                         }
3462                         if (vp != NULL)
3463                                 vrele(vp);
3464                         if (mp != NULL)
3465                                 vfs_unbusy(mp);
3466                         if (nfhp != NULL)
3467                                 free(nfhp, M_NFSFH);
3468                         if (!error)
3469                                 (void) nfsv4_fillattr(nd, NULL, NULL, NULL, &va,
3470                                     NULL, 0, &rattrbits, NULL, p, 0, 0, 0, 0,
3471                                     (uint64_t)0, NULL);
3472                         break;
3473                 case NFSV4OP_CBRECALL:
3474                         NFSCL_DEBUG(4, "cbrecall\n");
3475                         NFSM_DISSECT(tl, u_int32_t *, NFSX_STATEID +
3476                             NFSX_UNSIGNED);
3477                         stateid.seqid = *tl++;
3478                         NFSBCOPY((caddr_t)tl, (caddr_t)stateid.other,
3479                             NFSX_STATEIDOTHER);
3480                         tl += (NFSX_STATEIDOTHER / NFSX_UNSIGNED);
3481                         trunc = fxdr_unsigned(int, *tl);
3482                         error = nfsm_getfh(nd, &nfhp);
3483                         if (error == 0 && i == 0 &&
3484                             minorvers != NFSV4_MINORVERSION)
3485                                 error = NFSERR_OPNOTINSESS;
3486                         if (!error) {
3487                                 NFSLOCKCLSTATE();
3488                                 if (minorvers == NFSV4_MINORVERSION)
3489                                         clp = nfscl_getclnt(cbident);
3490                                 else
3491                                         clp = nfscl_getclntsess(sessionid);
3492                                 if (clp != NULL) {
3493                                         dp = nfscl_finddeleg(clp, nfhp->nfh_fh,
3494                                             nfhp->nfh_len);
3495                                         if (dp != NULL && (dp->nfsdl_flags &
3496                                             NFSCLDL_DELEGRET) == 0) {
3497                                                 dp->nfsdl_flags |=
3498                                                     NFSCLDL_RECALL;
3499                                                 wakeup((caddr_t)clp);
3500                                         }
3501                                 } else {
3502                                         error = NFSERR_SERVERFAULT;
3503                                 }
3504                                 NFSUNLOCKCLSTATE();
3505                         }
3506                         if (nfhp != NULL)
3507                                 free(nfhp, M_NFSFH);
3508                         break;
3509                 case NFSV4OP_CBLAYOUTRECALL:
3510                         NFSCL_DEBUG(4, "cblayrec\n");
3511                         nfhp = NULL;
3512                         NFSM_DISSECT(tl, uint32_t *, 4 * NFSX_UNSIGNED);
3513                         laytype = fxdr_unsigned(int, *tl++);
3514                         iomode = fxdr_unsigned(uint32_t, *tl++);
3515                         if (newnfs_true == *tl++)
3516                                 changed = 1;
3517                         else
3518                                 changed = 0;
3519                         recalltype = fxdr_unsigned(int, *tl);
3520                         NFSCL_DEBUG(4, "layt=%d iom=%d ch=%d rectyp=%d\n",
3521                             laytype, iomode, changed, recalltype);
3522                         recallp = malloc(sizeof(*recallp), M_NFSLAYRECALL,
3523                             M_WAITOK);
3524                         if (laytype != NFSLAYOUT_NFSV4_1_FILES &&
3525                             laytype != NFSLAYOUT_FLEXFILE)
3526                                 error = NFSERR_NOMATCHLAYOUT;
3527                         else if (recalltype == NFSLAYOUTRETURN_FILE) {
3528                                 error = nfsm_getfh(nd, &nfhp);
3529                                 NFSCL_DEBUG(4, "retfile getfh=%d\n", error);
3530                                 if (error != 0)
3531                                         goto nfsmout;
3532                                 NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_HYPER +
3533                                     NFSX_STATEID);
3534                                 off = fxdr_hyper(tl); tl += 2;
3535                                 len = fxdr_hyper(tl); tl += 2;
3536                                 stateid.seqid = fxdr_unsigned(uint32_t, *tl++);
3537                                 NFSBCOPY(tl, stateid.other, NFSX_STATEIDOTHER);
3538                                 if (minorvers == NFSV4_MINORVERSION)
3539                                         error = NFSERR_NOTSUPP;
3540                                 else if (i == 0)
3541                                         error = NFSERR_OPNOTINSESS;
3542                                 NFSCL_DEBUG(4, "off=%ju len=%ju sq=%u err=%d\n",
3543                                     (uintmax_t)off, (uintmax_t)len,
3544                                     stateid.seqid, error);
3545                                 if (error == 0) {
3546                                         NFSLOCKCLSTATE();
3547                                         clp = nfscl_getclntsess(sessionid);
3548                                         NFSCL_DEBUG(4, "cbly clp=%p\n", clp);
3549                                         if (clp != NULL) {
3550                                                 lyp = nfscl_findlayout(clp,
3551                                                     nfhp->nfh_fh,
3552                                                     nfhp->nfh_len);
3553                                                 NFSCL_DEBUG(4, "cblyp=%p\n",
3554                                                     lyp);
3555                                                 if (lyp != NULL &&
3556                                                     (lyp->nfsly_flags &
3557                                                      (NFSLY_FILES |
3558                                                       NFSLY_FLEXFILE)) != 0 &&
3559                                                     !NFSBCMP(stateid.other,
3560                                                     lyp->nfsly_stateid.other,
3561                                                     NFSX_STATEIDOTHER)) {
3562                                                         error =
3563                                                             nfscl_layoutrecall(
3564                                                             recalltype,
3565                                                             lyp, iomode, off,
3566                                                             len, stateid.seqid,
3567                                                             0, 0, NULL,
3568                                                             recallp);
3569                                                         if (error == 0 &&
3570                                                             stateid.seqid >
3571                                                             lyp->nfsly_stateid.seqid)
3572                                                                 lyp->nfsly_stateid.seqid =
3573                                                                     stateid.seqid;
3574                                                         recallp = NULL;
3575                                                         wakeup(clp);
3576                                                         NFSCL_DEBUG(4,
3577                                                             "aft layrcal=%d "
3578                                                             "layseqid=%d\n",
3579                                                             error,
3580                                                             lyp->nfsly_stateid.seqid);
3581                                                 } else
3582                                                         error =
3583                                                           NFSERR_NOMATCHLAYOUT;
3584                                         } else
3585                                                 error = NFSERR_NOMATCHLAYOUT;
3586                                         NFSUNLOCKCLSTATE();
3587                                 }
3588                                 free(nfhp, M_NFSFH);
3589                         } else if (recalltype == NFSLAYOUTRETURN_FSID) {
3590                                 NFSM_DISSECT(tl, uint32_t *, 2 * NFSX_HYPER);
3591                                 filesid[0] = fxdr_hyper(tl); tl += 2;
3592                                 filesid[1] = fxdr_hyper(tl); tl += 2;
3593                                 gotone = 0;
3594                                 NFSLOCKCLSTATE();
3595                                 clp = nfscl_getclntsess(sessionid);
3596                                 if (clp != NULL) {
3597                                         TAILQ_FOREACH(lyp, &clp->nfsc_layout,
3598                                             nfsly_list) {
3599                                                 if (lyp->nfsly_filesid[0] ==
3600                                                     filesid[0] &&
3601                                                     lyp->nfsly_filesid[1] ==
3602                                                     filesid[1]) {
3603                                                         error =
3604                                                             nfscl_layoutrecall(
3605                                                             recalltype,
3606                                                             lyp, iomode, 0,
3607                                                             UINT64_MAX,
3608                                                             lyp->nfsly_stateid.seqid,
3609                                                             0, 0, NULL,
3610                                                             recallp);
3611                                                         recallp = NULL;
3612                                                         gotone = 1;
3613                                                 }
3614                                         }
3615                                         if (gotone != 0)
3616                                                 wakeup(clp);
3617                                         else
3618                                                 error = NFSERR_NOMATCHLAYOUT;
3619                                 } else
3620                                         error = NFSERR_NOMATCHLAYOUT;
3621                                 NFSUNLOCKCLSTATE();
3622                         } else if (recalltype == NFSLAYOUTRETURN_ALL) {
3623                                 gotone = 0;
3624                                 NFSLOCKCLSTATE();
3625                                 clp = nfscl_getclntsess(sessionid);
3626                                 if (clp != NULL) {
3627                                         TAILQ_FOREACH(lyp, &clp->nfsc_layout,
3628                                             nfsly_list) {
3629                                                 error = nfscl_layoutrecall(
3630                                                     recalltype, lyp, iomode, 0,
3631                                                     UINT64_MAX,
3632                                                     lyp->nfsly_stateid.seqid,
3633                                                     0, 0, NULL, recallp);
3634                                                 recallp = NULL;
3635                                                 gotone = 1;
3636                                         }
3637                                         if (gotone != 0)
3638                                                 wakeup(clp);
3639                                         else
3640                                                 error = NFSERR_NOMATCHLAYOUT;
3641                                 } else
3642                                         error = NFSERR_NOMATCHLAYOUT;
3643                                 NFSUNLOCKCLSTATE();
3644                         } else
3645                                 error = NFSERR_NOMATCHLAYOUT;
3646                         if (recallp != NULL) {
3647                                 free(recallp, M_NFSLAYRECALL);
3648                                 recallp = NULL;
3649                         }
3650                         break;
3651                 case NFSV4OP_CBSEQUENCE:
3652                         NFSM_DISSECT(tl, uint32_t *, NFSX_V4SESSIONID +
3653                             5 * NFSX_UNSIGNED);
3654                         bcopy(tl, sessionid, NFSX_V4SESSIONID);
3655                         tl += NFSX_V4SESSIONID / NFSX_UNSIGNED;
3656                         seqid = fxdr_unsigned(uint32_t, *tl++);
3657                         slotid = fxdr_unsigned(uint32_t, *tl++);
3658                         highslot = fxdr_unsigned(uint32_t, *tl++);
3659                         cachethis = *tl++;
3660                         /* Throw away the referring call stuff. */
3661                         clist = fxdr_unsigned(int, *tl);
3662                         for (j = 0; j < clist; j++) {
3663                                 NFSM_DISSECT(tl, uint32_t *, NFSX_V4SESSIONID +
3664                                     NFSX_UNSIGNED);
3665                                 tl += NFSX_V4SESSIONID / NFSX_UNSIGNED;
3666                                 rcalls = fxdr_unsigned(int, *tl);
3667                                 for (k = 0; k < rcalls; k++) {
3668                                         NFSM_DISSECT(tl, uint32_t *,
3669                                             2 * NFSX_UNSIGNED);
3670                                 }
3671                         }
3672                         NFSLOCKCLSTATE();
3673                         if (i == 0) {
3674                                 clp = nfscl_getclntsess(sessionid);
3675                                 if (clp == NULL)
3676                                         error = NFSERR_SERVERFAULT;
3677                         } else
3678                                 error = NFSERR_SEQUENCEPOS;
3679                         if (error == 0) {
3680                                 tsep = nfsmnt_mdssession(clp->nfsc_nmp);
3681                                 error = nfsv4_seqsession(seqid, slotid,
3682                                     highslot, tsep->nfsess_cbslots, &rep,
3683                                     tsep->nfsess_backslots);
3684                         }
3685                         NFSUNLOCKCLSTATE();
3686                         if (error == 0 || error == NFSERR_REPLYFROMCACHE) {
3687                                 gotseq_ok = 1;
3688                                 if (rep != NULL) {
3689                                         /*
3690                                          * Handle a reply for a retried
3691                                          * callback.  The reply will be
3692                                          * re-inserted in the session cache
3693                                          * by the nfsv4_seqsess_cacherep() call
3694                                          * after out:
3695                                          */
3696                                         KASSERT(error == NFSERR_REPLYFROMCACHE,
3697                                             ("cbsequence: non-NULL rep"));
3698                                         NFSCL_DEBUG(4, "Got cbretry\n");
3699                                         m_freem(nd->nd_mreq);
3700                                         nd->nd_mreq = rep;
3701                                         rep = NULL;
3702                                         goto out;
3703                                 }
3704                                 NFSM_BUILD(tl, uint32_t *,
3705                                     NFSX_V4SESSIONID + 4 * NFSX_UNSIGNED);
3706                                 bcopy(sessionid, tl, NFSX_V4SESSIONID);
3707                                 tl += NFSX_V4SESSIONID / NFSX_UNSIGNED;
3708                                 *tl++ = txdr_unsigned(seqid);
3709                                 *tl++ = txdr_unsigned(slotid);
3710                                 *tl++ = txdr_unsigned(NFSV4_CBSLOTS - 1);
3711                                 *tl = txdr_unsigned(NFSV4_CBSLOTS - 1);
3712                         }
3713                         break;
3714                 default:
3715                         if (i == 0 && minorvers != NFSV4_MINORVERSION)
3716                                 error = NFSERR_OPNOTINSESS;
3717                         else {
3718                                 NFSCL_DEBUG(1, "unsupp callback %d\n", op);
3719                                 error = NFSERR_NOTSUPP;
3720                         }
3721                         break;
3722                 }
3723                 if (error) {
3724                         if (error == EBADRPC || error == NFSERR_BADXDR) {
3725                                 nd->nd_repstat = NFSERR_BADXDR;
3726                         } else {
3727                                 nd->nd_repstat = error;
3728                         }
3729                         error = 0;
3730                 }
3731                 retops++;
3732                 if (nd->nd_repstat) {
3733                         *repp = nfscl_errmap(nd, minorvers);
3734                         break;
3735                 } else
3736                         *repp = 0;      /* NFS4_OK */
3737         }
3738 nfsmout:
3739         if (recallp != NULL)
3740                 free(recallp, M_NFSLAYRECALL);
3741         if (error) {
3742                 if (error == EBADRPC || error == NFSERR_BADXDR)
3743                         nd->nd_repstat = NFSERR_BADXDR;
3744                 else
3745                         printf("nfsv4 comperr1=%d\n", error);
3746         }
3747         if (taglen == -1) {
3748                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
3749                 *tl++ = 0;
3750                 *tl = 0;
3751         } else {
3752                 *retopsp = txdr_unsigned(retops);
3753         }
3754         *nd->nd_errp = nfscl_errmap(nd, minorvers);
3755 out:
3756         if (gotseq_ok != 0) {
3757                 rep = m_copym(nd->nd_mreq, 0, M_COPYALL, M_WAITOK);
3758                 NFSLOCKCLSTATE();
3759                 clp = nfscl_getclntsess(sessionid);
3760                 if (clp != NULL) {
3761                         tsep = nfsmnt_mdssession(clp->nfsc_nmp);
3762                         nfsv4_seqsess_cacherep(slotid, tsep->nfsess_cbslots,
3763                             NFSERR_OK, &rep);
3764                         NFSUNLOCKCLSTATE();
3765                 } else {
3766                         NFSUNLOCKCLSTATE();
3767                         m_freem(rep);
3768                 }
3769         }
3770 }
3771
3772 /*
3773  * Generate the next cbident value. Basically just increment a static value
3774  * and then check that it isn't already in the list, if it has wrapped around.
3775  */
3776 static u_int32_t
3777 nfscl_nextcbident(void)
3778 {
3779         struct nfsclclient *clp;
3780         int matched;
3781         static u_int32_t nextcbident = 0;
3782         static int haswrapped = 0;
3783
3784         nextcbident++;
3785         if (nextcbident == 0)
3786                 haswrapped = 1;
3787         if (haswrapped) {
3788                 /*
3789                  * Search the clientid list for one already using this cbident.
3790                  */
3791                 do {
3792                         matched = 0;
3793                         NFSLOCKCLSTATE();
3794                         LIST_FOREACH(clp, &nfsclhead, nfsc_list) {
3795                                 if (clp->nfsc_cbident == nextcbident) {
3796                                         matched = 1;
3797                                         break;
3798                                 }
3799                         }
3800                         NFSUNLOCKCLSTATE();
3801                         if (matched == 1)
3802                                 nextcbident++;
3803                 } while (matched);
3804         }
3805         return (nextcbident);
3806 }
3807
3808 /*
3809  * Get the mount point related to a given cbident or session and busy it.
3810  */
3811 static mount_t
3812 nfscl_getmnt(int minorvers, uint8_t *sessionid, u_int32_t cbident,
3813     struct nfsclclient **clpp)
3814 {
3815         struct nfsclclient *clp;
3816         mount_t mp;
3817         int error;
3818         struct nfsclsession *tsep;
3819
3820         *clpp = NULL;
3821         NFSLOCKCLSTATE();
3822         LIST_FOREACH(clp, &nfsclhead, nfsc_list) {
3823                 tsep = nfsmnt_mdssession(clp->nfsc_nmp);
3824                 if (minorvers == NFSV4_MINORVERSION) {
3825                         if (clp->nfsc_cbident == cbident)
3826                                 break;
3827                 } else if (!NFSBCMP(tsep->nfsess_sessionid, sessionid,
3828                     NFSX_V4SESSIONID))
3829                         break;
3830         }
3831         if (clp == NULL) {
3832                 NFSUNLOCKCLSTATE();
3833                 return (NULL);
3834         }
3835         mp = clp->nfsc_nmp->nm_mountp;
3836         vfs_ref(mp);
3837         NFSUNLOCKCLSTATE();
3838         error = vfs_busy(mp, 0);
3839         vfs_rel(mp);
3840         if (error != 0)
3841                 return (NULL);
3842         *clpp = clp;
3843         return (mp);
3844 }
3845
3846 /*
3847  * Get the clientid pointer related to a given cbident.
3848  */
3849 static struct nfsclclient *
3850 nfscl_getclnt(u_int32_t cbident)
3851 {
3852         struct nfsclclient *clp;
3853
3854         LIST_FOREACH(clp, &nfsclhead, nfsc_list)
3855                 if (clp->nfsc_cbident == cbident)
3856                         break;
3857         return (clp);
3858 }
3859
3860 /*
3861  * Get the clientid pointer related to a given sessionid.
3862  */
3863 static struct nfsclclient *
3864 nfscl_getclntsess(uint8_t *sessionid)
3865 {
3866         struct nfsclclient *clp;
3867         struct nfsclsession *tsep;
3868
3869         LIST_FOREACH(clp, &nfsclhead, nfsc_list) {
3870                 tsep = nfsmnt_mdssession(clp->nfsc_nmp);
3871                 if (!NFSBCMP(tsep->nfsess_sessionid, sessionid,
3872                     NFSX_V4SESSIONID))
3873                         break;
3874         }
3875         return (clp);
3876 }
3877
3878 /*
3879  * Search for a lock conflict locally on the client. A conflict occurs if
3880  * - not same owner and overlapping byte range and at least one of them is
3881  *   a write lock or this is an unlock.
3882  */
3883 static int
3884 nfscl_localconflict(struct nfsclclient *clp, u_int8_t *fhp, int fhlen,
3885     struct nfscllock *nlop, u_int8_t *own, struct nfscldeleg *dp,
3886     struct nfscllock **lopp)
3887 {
3888         struct nfsclowner *owp;
3889         struct nfsclopen *op;
3890         int ret;
3891
3892         if (dp != NULL) {
3893                 ret = nfscl_checkconflict(&dp->nfsdl_lock, nlop, own, lopp);
3894                 if (ret)
3895                         return (ret);
3896         }
3897         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
3898                 LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
3899                         if (op->nfso_fhlen == fhlen &&
3900                             !NFSBCMP(op->nfso_fh, fhp, fhlen)) {
3901                                 ret = nfscl_checkconflict(&op->nfso_lock, nlop,
3902                                     own, lopp);
3903                                 if (ret)
3904                                         return (ret);
3905                         }
3906                 }
3907         }
3908         return (0);
3909 }
3910
3911 static int
3912 nfscl_checkconflict(struct nfscllockownerhead *lhp, struct nfscllock *nlop,
3913     u_int8_t *own, struct nfscllock **lopp)
3914 {
3915         struct nfscllockowner *lp;
3916         struct nfscllock *lop;
3917
3918         LIST_FOREACH(lp, lhp, nfsl_list) {
3919                 if (NFSBCMP(lp->nfsl_owner, own, NFSV4CL_LOCKNAMELEN)) {
3920                         LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
3921                                 if (lop->nfslo_first >= nlop->nfslo_end)
3922                                         break;
3923                                 if (lop->nfslo_end <= nlop->nfslo_first)
3924                                         continue;
3925                                 if (lop->nfslo_type == F_WRLCK ||
3926                                     nlop->nfslo_type == F_WRLCK ||
3927                                     nlop->nfslo_type == F_UNLCK) {
3928                                         if (lopp != NULL)
3929                                                 *lopp = lop;
3930                                         return (NFSERR_DENIED);
3931                                 }
3932                         }
3933                 }
3934         }
3935         return (0);
3936 }
3937
3938 /*
3939  * Check for a local conflicting lock.
3940  */
3941 int
3942 nfscl_lockt(vnode_t vp, struct nfsclclient *clp, u_int64_t off,
3943     u_int64_t len, struct flock *fl, NFSPROC_T *p, void *id, int flags)
3944 {
3945         struct nfscllock *lop, nlck;
3946         struct nfscldeleg *dp;
3947         struct nfsnode *np;
3948         u_int8_t own[NFSV4CL_LOCKNAMELEN];
3949         int error;
3950
3951         nlck.nfslo_type = fl->l_type;
3952         nlck.nfslo_first = off;
3953         if (len == NFS64BITSSET) {
3954                 nlck.nfslo_end = NFS64BITSSET;
3955         } else {
3956                 nlck.nfslo_end = off + len;
3957                 if (nlck.nfslo_end <= nlck.nfslo_first)
3958                         return (NFSERR_INVAL);
3959         }
3960         np = VTONFS(vp);
3961         nfscl_filllockowner(id, own, flags);
3962         NFSLOCKCLSTATE();
3963         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
3964         error = nfscl_localconflict(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len,
3965             &nlck, own, dp, &lop);
3966         if (error != 0) {
3967                 fl->l_whence = SEEK_SET;
3968                 fl->l_start = lop->nfslo_first;
3969                 if (lop->nfslo_end == NFS64BITSSET)
3970                         fl->l_len = 0;
3971                 else
3972                         fl->l_len = lop->nfslo_end - lop->nfslo_first;
3973                 fl->l_pid = (pid_t)0;
3974                 fl->l_type = lop->nfslo_type;
3975                 error = -1;                     /* no RPC required */
3976         } else if (dp != NULL && ((dp->nfsdl_flags & NFSCLDL_WRITE) ||
3977             fl->l_type == F_RDLCK)) {
3978                 /*
3979                  * The delegation ensures that there isn't a conflicting
3980                  * lock on the server, so return -1 to indicate an RPC
3981                  * isn't required.
3982                  */
3983                 fl->l_type = F_UNLCK;
3984                 error = -1;
3985         }
3986         NFSUNLOCKCLSTATE();
3987         return (error);
3988 }
3989
3990 /*
3991  * Handle Recall of a delegation.
3992  * The clp must be exclusive locked when this is called.
3993  */
3994 static int
3995 nfscl_recalldeleg(struct nfsclclient *clp, struct nfsmount *nmp,
3996     struct nfscldeleg *dp, vnode_t vp, struct ucred *cred, NFSPROC_T *p,
3997     int called_from_renewthread, vnode_t *vpp)
3998 {
3999         struct nfsclowner *owp, *lowp, *nowp;
4000         struct nfsclopen *op, *lop;
4001         struct nfscllockowner *lp;
4002         struct nfscllock *lckp;
4003         struct nfsnode *np;
4004         int error = 0, ret;
4005
4006         if (vp == NULL) {
4007                 KASSERT(vpp != NULL, ("nfscl_recalldeleg: vpp NULL"));
4008                 *vpp = NULL;
4009                 /*
4010                  * First, get a vnode for the file. This is needed to do RPCs.
4011                  */
4012                 ret = nfscl_ngetreopen(nmp->nm_mountp, dp->nfsdl_fh,
4013                     dp->nfsdl_fhlen, p, &np);
4014                 if (ret) {
4015                         /*
4016                          * File isn't open, so nothing to move over to the
4017                          * server.
4018                          */
4019                         return (0);
4020                 }
4021                 vp = NFSTOV(np);
4022                 *vpp = vp;
4023         } else {
4024                 np = VTONFS(vp);
4025         }
4026         dp->nfsdl_flags &= ~NFSCLDL_MODTIMESET;
4027
4028         /*
4029          * Ok, if it's a write delegation, flush data to the server, so
4030          * that close/open consistency is retained.
4031          */
4032         ret = 0;
4033         NFSLOCKNODE(np);
4034         if ((dp->nfsdl_flags & NFSCLDL_WRITE) && (np->n_flag & NMODIFIED)) {
4035                 np->n_flag |= NDELEGRECALL;
4036                 NFSUNLOCKNODE(np);
4037                 ret = ncl_flush(vp, MNT_WAIT, p, 1, called_from_renewthread);
4038                 NFSLOCKNODE(np);
4039                 np->n_flag &= ~NDELEGRECALL;
4040         }
4041         NFSINVALATTRCACHE(np);
4042         NFSUNLOCKNODE(np);
4043         if (ret == EIO && called_from_renewthread != 0) {
4044                 /*
4045                  * If the flush failed with EIO for the renew thread,
4046                  * return now, so that the dirty buffer will be flushed
4047                  * later.
4048                  */
4049                 return (ret);
4050         }
4051
4052         /*
4053          * Now, for each openowner with opens issued locally, move them
4054          * over to state against the server.
4055          */
4056         LIST_FOREACH(lowp, &dp->nfsdl_owner, nfsow_list) {
4057                 lop = LIST_FIRST(&lowp->nfsow_open);
4058                 if (lop != NULL) {
4059                         if (LIST_NEXT(lop, nfso_list) != NULL)
4060                                 panic("nfsdlg mult opens");
4061                         /*
4062                          * Look for the same openowner against the server.
4063                          */
4064                         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
4065                                 if (!NFSBCMP(lowp->nfsow_owner,
4066                                     owp->nfsow_owner, NFSV4CL_LOCKNAMELEN)) {
4067                                         newnfs_copycred(&dp->nfsdl_cred, cred);
4068                                         ret = nfscl_moveopen(vp, clp, nmp, lop,
4069                                             owp, dp, cred, p);
4070                                         if (ret == NFSERR_STALECLIENTID ||
4071                                             ret == NFSERR_STALEDONTRECOVER ||
4072                                             ret == NFSERR_BADSESSION)
4073                                                 return (ret);
4074                                         if (ret) {
4075                                                 nfscl_freeopen(lop, 1);
4076                                                 if (!error)
4077                                                         error = ret;
4078                                         }
4079                                         break;
4080                                 }
4081                         }
4082
4083                         /*
4084                          * If no openowner found, create one and get an open
4085                          * for it.
4086                          */
4087                         if (owp == NULL) {
4088                                 nowp = malloc(
4089                                     sizeof (struct nfsclowner), M_NFSCLOWNER,
4090                                     M_WAITOK);
4091                                 nfscl_newopen(clp, NULL, &owp, &nowp, &op,
4092                                     NULL, lowp->nfsow_owner, dp->nfsdl_fh,
4093                                     dp->nfsdl_fhlen, NULL, NULL);
4094                                 newnfs_copycred(&dp->nfsdl_cred, cred);
4095                                 ret = nfscl_moveopen(vp, clp, nmp, lop,
4096                                     owp, dp, cred, p);
4097                                 if (ret) {
4098                                         nfscl_freeopenowner(owp, 0);
4099                                         if (ret == NFSERR_STALECLIENTID ||
4100                                             ret == NFSERR_STALEDONTRECOVER ||
4101                                             ret == NFSERR_BADSESSION)
4102                                                 return (ret);
4103                                         if (ret) {
4104                                                 nfscl_freeopen(lop, 1);
4105                                                 if (!error)
4106                                                         error = ret;
4107                                         }
4108                                 }
4109                         }
4110                 }
4111         }
4112
4113         /*
4114          * Now, get byte range locks for any locks done locally.
4115          */
4116         LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
4117                 LIST_FOREACH(lckp, &lp->nfsl_lock, nfslo_list) {
4118                         newnfs_copycred(&dp->nfsdl_cred, cred);
4119                         ret = nfscl_relock(vp, clp, nmp, lp, lckp, cred, p);
4120                         if (ret == NFSERR_STALESTATEID ||
4121                             ret == NFSERR_STALEDONTRECOVER ||
4122                             ret == NFSERR_STALECLIENTID ||
4123                             ret == NFSERR_BADSESSION)
4124                                 return (ret);
4125                         if (ret && !error)
4126                                 error = ret;
4127                 }
4128         }
4129         return (error);
4130 }
4131
4132 /*
4133  * Move a locally issued open over to an owner on the state list.
4134  * SIDE EFFECT: If it needs to sleep (do an rpc), it unlocks clstate and
4135  * returns with it unlocked.
4136  */
4137 static int
4138 nfscl_moveopen(vnode_t vp, struct nfsclclient *clp, struct nfsmount *nmp,
4139     struct nfsclopen *lop, struct nfsclowner *owp, struct nfscldeleg *dp,
4140     struct ucred *cred, NFSPROC_T *p)
4141 {
4142         struct nfsclopen *op, *nop;
4143         struct nfscldeleg *ndp;
4144         struct nfsnode *np;
4145         int error = 0, newone;
4146
4147         /*
4148          * First, look for an appropriate open, If found, just increment the
4149          * opencnt in it.
4150          */
4151         LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
4152                 if ((op->nfso_mode & lop->nfso_mode) == lop->nfso_mode &&
4153                     op->nfso_fhlen == lop->nfso_fhlen &&
4154                     !NFSBCMP(op->nfso_fh, lop->nfso_fh, op->nfso_fhlen)) {
4155                         op->nfso_opencnt += lop->nfso_opencnt;
4156                         nfscl_freeopen(lop, 1);
4157                         return (0);
4158                 }
4159         }
4160
4161         /* No appropriate open, so we have to do one against the server. */
4162         np = VTONFS(vp);
4163         nop = malloc(sizeof (struct nfsclopen) +
4164             lop->nfso_fhlen - 1, M_NFSCLOPEN, M_WAITOK);
4165         newone = 0;
4166         nfscl_newopen(clp, NULL, &owp, NULL, &op, &nop, owp->nfsow_owner,
4167             lop->nfso_fh, lop->nfso_fhlen, cred, &newone);
4168         ndp = dp;
4169         error = nfscl_tryopen(nmp, vp, np->n_v4->n4_data, np->n_v4->n4_fhlen,
4170             lop->nfso_fh, lop->nfso_fhlen, lop->nfso_mode, op,
4171             NFS4NODENAME(np->n_v4), np->n_v4->n4_namelen, &ndp, 0, 0, cred, p);
4172         if (error) {
4173                 if (newone)
4174                         nfscl_freeopen(op, 0);
4175         } else {
4176                 op->nfso_mode |= lop->nfso_mode;
4177                 op->nfso_opencnt += lop->nfso_opencnt;
4178                 nfscl_freeopen(lop, 1);
4179         }
4180         if (nop != NULL)
4181                 free(nop, M_NFSCLOPEN);
4182         if (ndp != NULL) {
4183                 /*
4184                  * What should I do with the returned delegation, since the
4185                  * delegation is being recalled? For now, just printf and
4186                  * through it away.
4187                  */
4188                 printf("Moveopen returned deleg\n");
4189                 free(ndp, M_NFSCLDELEG);
4190         }
4191         return (error);
4192 }
4193
4194 /*
4195  * Recall all delegations on this client.
4196  */
4197 static void
4198 nfscl_totalrecall(struct nfsclclient *clp)
4199 {
4200         struct nfscldeleg *dp;
4201
4202         TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
4203                 if ((dp->nfsdl_flags & NFSCLDL_DELEGRET) == 0)
4204                         dp->nfsdl_flags |= NFSCLDL_RECALL;
4205         }
4206 }
4207
4208 /*
4209  * Relock byte ranges. Called for delegation recall and state expiry.
4210  */
4211 static int
4212 nfscl_relock(vnode_t vp, struct nfsclclient *clp, struct nfsmount *nmp,
4213     struct nfscllockowner *lp, struct nfscllock *lop, struct ucred *cred,
4214     NFSPROC_T *p)
4215 {
4216         struct nfscllockowner *nlp;
4217         struct nfsfh *nfhp;
4218         u_int64_t off, len;
4219         int error, newone, donelocally;
4220
4221         off = lop->nfslo_first;
4222         len = lop->nfslo_end - lop->nfslo_first;
4223         error = nfscl_getbytelock(vp, off, len, lop->nfslo_type, cred, p,
4224             clp, 1, NULL, lp->nfsl_lockflags, lp->nfsl_owner,
4225             lp->nfsl_openowner, &nlp, &newone, &donelocally);
4226         if (error || donelocally)
4227                 return (error);
4228         nfhp = VTONFS(vp)->n_fhp;
4229         error = nfscl_trylock(nmp, vp, nfhp->nfh_fh,
4230             nfhp->nfh_len, nlp, newone, 0, off,
4231             len, lop->nfslo_type, cred, p);
4232         if (error)
4233                 nfscl_freelockowner(nlp, 0);
4234         return (error);
4235 }
4236
4237 /*
4238  * Called to re-open a file. Basically get a vnode for the file handle
4239  * and then call nfsrpc_openrpc() to do the rest.
4240  */
4241 static int
4242 nfsrpc_reopen(struct nfsmount *nmp, u_int8_t *fhp, int fhlen,
4243     u_int32_t mode, struct nfsclopen *op, struct nfscldeleg **dpp,
4244     struct ucred *cred, NFSPROC_T *p)
4245 {
4246         struct nfsnode *np;
4247         vnode_t vp;
4248         int error;
4249
4250         error = nfscl_ngetreopen(nmp->nm_mountp, fhp, fhlen, p, &np);
4251         if (error)
4252                 return (error);
4253         vp = NFSTOV(np);
4254         if (np->n_v4 != NULL) {
4255                 error = nfscl_tryopen(nmp, vp, np->n_v4->n4_data,
4256                     np->n_v4->n4_fhlen, fhp, fhlen, mode, op,
4257                     NFS4NODENAME(np->n_v4), np->n_v4->n4_namelen, dpp, 0, 0,
4258                     cred, p);
4259         } else {
4260                 error = EINVAL;
4261         }
4262         vrele(vp);
4263         return (error);
4264 }
4265
4266 /*
4267  * Try an open against the server. Just call nfsrpc_openrpc(), retrying while
4268  * NFSERR_DELAY. Also, try system credentials, if the passed in credentials
4269  * fail.
4270  */
4271 static int
4272 nfscl_tryopen(struct nfsmount *nmp, vnode_t vp, u_int8_t *fhp, int fhlen,
4273     u_int8_t *newfhp, int newfhlen, u_int32_t mode, struct nfsclopen *op,
4274     u_int8_t *name, int namelen, struct nfscldeleg **ndpp,
4275     int reclaim, u_int32_t delegtype, struct ucred *cred, NFSPROC_T *p)
4276 {
4277         int error;
4278
4279         do {
4280                 error = nfsrpc_openrpc(nmp, vp, fhp, fhlen, newfhp, newfhlen,
4281                     mode, op, name, namelen, ndpp, reclaim, delegtype, cred, p,
4282                     0, 0);
4283                 if (error == NFSERR_DELAY)
4284                         (void) nfs_catnap(PZERO, error, "nfstryop");
4285         } while (error == NFSERR_DELAY);
4286         if (error == EAUTH || error == EACCES) {
4287                 /* Try again using system credentials */
4288                 newnfs_setroot(cred);
4289                 do {
4290                     error = nfsrpc_openrpc(nmp, vp, fhp, fhlen, newfhp,
4291                         newfhlen, mode, op, name, namelen, ndpp, reclaim,
4292                         delegtype, cred, p, 1, 0);
4293                     if (error == NFSERR_DELAY)
4294                         (void) nfs_catnap(PZERO, error, "nfstryop");
4295                 } while (error == NFSERR_DELAY);
4296         }
4297         return (error);
4298 }
4299
4300 /*
4301  * Try a byte range lock. Just loop on nfsrpc_lock() while it returns
4302  * NFSERR_DELAY. Also, retry with system credentials, if the provided
4303  * cred don't work.
4304  */
4305 static int
4306 nfscl_trylock(struct nfsmount *nmp, vnode_t vp, u_int8_t *fhp,
4307     int fhlen, struct nfscllockowner *nlp, int newone, int reclaim,
4308     u_int64_t off, u_int64_t len, short type, struct ucred *cred, NFSPROC_T *p)
4309 {
4310         struct nfsrv_descript nfsd, *nd = &nfsd;
4311         int error;
4312
4313         do {
4314                 error = nfsrpc_lock(nd, nmp, vp, fhp, fhlen, nlp, newone,
4315                     reclaim, off, len, type, cred, p, 0);
4316                 if (!error && nd->nd_repstat == NFSERR_DELAY)
4317                         (void) nfs_catnap(PZERO, (int)nd->nd_repstat,
4318                             "nfstrylck");
4319         } while (!error && nd->nd_repstat == NFSERR_DELAY);
4320         if (!error)
4321                 error = nd->nd_repstat;
4322         if (error == EAUTH || error == EACCES) {
4323                 /* Try again using root credentials */
4324                 newnfs_setroot(cred);
4325                 do {
4326                         error = nfsrpc_lock(nd, nmp, vp, fhp, fhlen, nlp,
4327                             newone, reclaim, off, len, type, cred, p, 1);
4328                         if (!error && nd->nd_repstat == NFSERR_DELAY)
4329                                 (void) nfs_catnap(PZERO, (int)nd->nd_repstat,
4330                                     "nfstrylck");
4331                 } while (!error && nd->nd_repstat == NFSERR_DELAY);
4332                 if (!error)
4333                         error = nd->nd_repstat;
4334         }
4335         return (error);
4336 }
4337
4338 /*
4339  * Try a delegreturn against the server. Just call nfsrpc_delegreturn(),
4340  * retrying while NFSERR_DELAY. Also, try system credentials, if the passed in
4341  * credentials fail.
4342  */
4343 static int
4344 nfscl_trydelegreturn(struct nfscldeleg *dp, struct ucred *cred,
4345     struct nfsmount *nmp, NFSPROC_T *p)
4346 {
4347         int error;
4348
4349         do {
4350                 error = nfsrpc_delegreturn(dp, cred, nmp, p, 0);
4351                 if (error == NFSERR_DELAY)
4352                         (void) nfs_catnap(PZERO, error, "nfstrydp");
4353         } while (error == NFSERR_DELAY);
4354         if (error == EAUTH || error == EACCES) {
4355                 /* Try again using system credentials */
4356                 newnfs_setroot(cred);
4357                 do {
4358                         error = nfsrpc_delegreturn(dp, cred, nmp, p, 1);
4359                         if (error == NFSERR_DELAY)
4360                                 (void) nfs_catnap(PZERO, error, "nfstrydp");
4361                 } while (error == NFSERR_DELAY);
4362         }
4363         return (error);
4364 }
4365
4366 /*
4367  * Try a close against the server. Just call nfsrpc_closerpc(),
4368  * retrying while NFSERR_DELAY. Also, try system credentials, if the passed in
4369  * credentials fail.
4370  */
4371 int
4372 nfscl_tryclose(struct nfsclopen *op, struct ucred *cred,
4373     struct nfsmount *nmp, NFSPROC_T *p)
4374 {
4375         struct nfsrv_descript nfsd, *nd = &nfsd;
4376         int error;
4377
4378         do {
4379                 error = nfsrpc_closerpc(nd, nmp, op, cred, p, 0);
4380                 if (error == NFSERR_DELAY)
4381                         (void) nfs_catnap(PZERO, error, "nfstrycl");
4382         } while (error == NFSERR_DELAY);
4383         if (error == EAUTH || error == EACCES) {
4384                 /* Try again using system credentials */
4385                 newnfs_setroot(cred);
4386                 do {
4387                         error = nfsrpc_closerpc(nd, nmp, op, cred, p, 1);
4388                         if (error == NFSERR_DELAY)
4389                                 (void) nfs_catnap(PZERO, error, "nfstrycl");
4390                 } while (error == NFSERR_DELAY);
4391         }
4392         return (error);
4393 }
4394
4395 /*
4396  * Decide if a delegation on a file permits close without flushing writes
4397  * to the server. This might be a big performance win in some environments.
4398  * (Not useful until the client does caching on local stable storage.)
4399  */
4400 int
4401 nfscl_mustflush(vnode_t vp)
4402 {
4403         struct nfsclclient *clp;
4404         struct nfscldeleg *dp;
4405         struct nfsnode *np;
4406         struct nfsmount *nmp;
4407
4408         np = VTONFS(vp);
4409         nmp = VFSTONFS(vp->v_mount);
4410         if (!NFSHASNFSV4(nmp))
4411                 return (1);
4412         NFSLOCKCLSTATE();
4413         clp = nfscl_findcl(nmp);
4414         if (clp == NULL) {
4415                 NFSUNLOCKCLSTATE();
4416                 return (1);
4417         }
4418         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
4419         if (dp != NULL && (dp->nfsdl_flags &
4420             (NFSCLDL_WRITE | NFSCLDL_RECALL | NFSCLDL_DELEGRET)) ==
4421              NFSCLDL_WRITE &&
4422             (dp->nfsdl_sizelimit >= np->n_size ||
4423              !NFSHASSTRICT3530(nmp))) {
4424                 NFSUNLOCKCLSTATE();
4425                 return (0);
4426         }
4427         NFSUNLOCKCLSTATE();
4428         return (1);
4429 }
4430
4431 /*
4432  * See if a (write) delegation exists for this file.
4433  */
4434 int
4435 nfscl_nodeleg(vnode_t vp, int writedeleg)
4436 {
4437         struct nfsclclient *clp;
4438         struct nfscldeleg *dp;
4439         struct nfsnode *np;
4440         struct nfsmount *nmp;
4441
4442         np = VTONFS(vp);
4443         nmp = VFSTONFS(vp->v_mount);
4444         if (!NFSHASNFSV4(nmp))
4445                 return (1);
4446         NFSLOCKCLSTATE();
4447         clp = nfscl_findcl(nmp);
4448         if (clp == NULL) {
4449                 NFSUNLOCKCLSTATE();
4450                 return (1);
4451         }
4452         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
4453         if (dp != NULL &&
4454             (dp->nfsdl_flags & (NFSCLDL_RECALL | NFSCLDL_DELEGRET)) == 0 &&
4455             (writedeleg == 0 || (dp->nfsdl_flags & NFSCLDL_WRITE) ==
4456              NFSCLDL_WRITE)) {
4457                 NFSUNLOCKCLSTATE();
4458                 return (0);
4459         }
4460         NFSUNLOCKCLSTATE();
4461         return (1);
4462 }
4463
4464 /*
4465  * Look for an associated delegation that should be DelegReturned.
4466  */
4467 int
4468 nfscl_removedeleg(vnode_t vp, NFSPROC_T *p, nfsv4stateid_t *stp)
4469 {
4470         struct nfsclclient *clp;
4471         struct nfscldeleg *dp;
4472         struct nfsclowner *owp;
4473         struct nfscllockowner *lp;
4474         struct nfsmount *nmp;
4475         struct ucred *cred;
4476         struct nfsnode *np;
4477         int igotlock = 0, triedrecall = 0, needsrecall, retcnt = 0, islept;
4478
4479         nmp = VFSTONFS(vp->v_mount);
4480         np = VTONFS(vp);
4481         NFSLOCKCLSTATE();
4482         /*
4483          * Loop around waiting for:
4484          * - outstanding I/O operations on delegations to complete
4485          * - for a delegation on vp that has state, lock the client and
4486          *   do a recall
4487          * - return delegation with no state
4488          */
4489         while (1) {
4490                 clp = nfscl_findcl(nmp);
4491                 if (clp == NULL) {
4492                         NFSUNLOCKCLSTATE();
4493                         return (retcnt);
4494                 }
4495                 dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh,
4496                     np->n_fhp->nfh_len);
4497                 if (dp != NULL) {
4498                     /*
4499                      * Wait for outstanding I/O ops to be done.
4500                      */
4501                     if (dp->nfsdl_rwlock.nfslock_usecnt > 0) {
4502                         if (igotlock) {
4503                             nfsv4_unlock(&clp->nfsc_lock, 0);
4504                             igotlock = 0;
4505                         }
4506                         dp->nfsdl_rwlock.nfslock_lock |= NFSV4LOCK_WANTED;
4507                         (void) nfsmsleep(&dp->nfsdl_rwlock,
4508                             NFSCLSTATEMUTEXPTR, PZERO, "nfscld", NULL);
4509                         continue;
4510                     }
4511                     needsrecall = 0;
4512                     LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
4513                         if (!LIST_EMPTY(&owp->nfsow_open)) {
4514                             needsrecall = 1;
4515                             break;
4516                         }
4517                     }
4518                     if (!needsrecall) {
4519                         LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
4520                             if (!LIST_EMPTY(&lp->nfsl_lock)) {
4521                                 needsrecall = 1;
4522                                 break;
4523                             }
4524                         }
4525                     }
4526                     if (needsrecall && !triedrecall) {
4527                         dp->nfsdl_flags |= NFSCLDL_DELEGRET;
4528                         islept = 0;
4529                         while (!igotlock) {
4530                             igotlock = nfsv4_lock(&clp->nfsc_lock, 1,
4531                                 &islept, NFSCLSTATEMUTEXPTR, NULL);
4532                             if (islept)
4533                                 break;
4534                         }
4535                         if (islept)
4536                             continue;
4537                         NFSUNLOCKCLSTATE();
4538                         cred = newnfs_getcred();
4539                         newnfs_copycred(&dp->nfsdl_cred, cred);
4540                         nfscl_recalldeleg(clp, nmp, dp, vp, cred, p, 0, NULL);
4541                         NFSFREECRED(cred);
4542                         triedrecall = 1;
4543                         NFSLOCKCLSTATE();
4544                         nfsv4_unlock(&clp->nfsc_lock, 0);
4545                         igotlock = 0;
4546                         continue;
4547                     }
4548                     *stp = dp->nfsdl_stateid;
4549                     retcnt = 1;
4550                     nfscl_cleandeleg(dp);
4551                     nfscl_freedeleg(&clp->nfsc_deleg, dp, true);
4552                 }
4553                 if (igotlock)
4554                     nfsv4_unlock(&clp->nfsc_lock, 0);
4555                 NFSUNLOCKCLSTATE();
4556                 return (retcnt);
4557         }
4558 }
4559
4560 /*
4561  * Look for associated delegation(s) that should be DelegReturned.
4562  */
4563 int
4564 nfscl_renamedeleg(vnode_t fvp, nfsv4stateid_t *fstp, int *gotfdp, vnode_t tvp,
4565     nfsv4stateid_t *tstp, int *gottdp, NFSPROC_T *p)
4566 {
4567         struct nfsclclient *clp;
4568         struct nfscldeleg *dp;
4569         struct nfsclowner *owp;
4570         struct nfscllockowner *lp;
4571         struct nfsmount *nmp;
4572         struct ucred *cred;
4573         struct nfsnode *np;
4574         int igotlock = 0, triedrecall = 0, needsrecall, retcnt = 0, islept;
4575
4576         nmp = VFSTONFS(fvp->v_mount);
4577         *gotfdp = 0;
4578         *gottdp = 0;
4579         NFSLOCKCLSTATE();
4580         /*
4581          * Loop around waiting for:
4582          * - outstanding I/O operations on delegations to complete
4583          * - for a delegation on fvp that has state, lock the client and
4584          *   do a recall
4585          * - return delegation(s) with no state.
4586          */
4587         while (1) {
4588                 clp = nfscl_findcl(nmp);
4589                 if (clp == NULL) {
4590                         NFSUNLOCKCLSTATE();
4591                         return (retcnt);
4592                 }
4593                 np = VTONFS(fvp);
4594                 dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh,
4595                     np->n_fhp->nfh_len);
4596                 if (dp != NULL && *gotfdp == 0) {
4597                     /*
4598                      * Wait for outstanding I/O ops to be done.
4599                      */
4600                     if (dp->nfsdl_rwlock.nfslock_usecnt > 0) {
4601                         if (igotlock) {
4602                             nfsv4_unlock(&clp->nfsc_lock, 0);
4603                             igotlock = 0;
4604                         }
4605                         dp->nfsdl_rwlock.nfslock_lock |= NFSV4LOCK_WANTED;
4606                         (void) nfsmsleep(&dp->nfsdl_rwlock,
4607                             NFSCLSTATEMUTEXPTR, PZERO, "nfscld", NULL);
4608                         continue;
4609                     }
4610                     needsrecall = 0;
4611                     LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
4612                         if (!LIST_EMPTY(&owp->nfsow_open)) {
4613                             needsrecall = 1;
4614                             break;
4615                         }
4616                     }
4617                     if (!needsrecall) {
4618                         LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
4619                             if (!LIST_EMPTY(&lp->nfsl_lock)) {
4620                                 needsrecall = 1;
4621                                 break;
4622                             }
4623                         }
4624                     }
4625                     if (needsrecall && !triedrecall) {
4626                         dp->nfsdl_flags |= NFSCLDL_DELEGRET;
4627                         islept = 0;
4628                         while (!igotlock) {
4629                             igotlock = nfsv4_lock(&clp->nfsc_lock, 1,
4630                                 &islept, NFSCLSTATEMUTEXPTR, NULL);
4631                             if (islept)
4632                                 break;
4633                         }
4634                         if (islept)
4635                             continue;
4636                         NFSUNLOCKCLSTATE();
4637                         cred = newnfs_getcred();
4638                         newnfs_copycred(&dp->nfsdl_cred, cred);
4639                         nfscl_recalldeleg(clp, nmp, dp, fvp, cred, p, 0, NULL);
4640                         NFSFREECRED(cred);
4641                         triedrecall = 1;
4642                         NFSLOCKCLSTATE();
4643                         nfsv4_unlock(&clp->nfsc_lock, 0);
4644                         igotlock = 0;
4645                         continue;
4646                     }
4647                     *fstp = dp->nfsdl_stateid;
4648                     retcnt++;
4649                     *gotfdp = 1;
4650                     nfscl_cleandeleg(dp);
4651                     nfscl_freedeleg(&clp->nfsc_deleg, dp, true);
4652                 }
4653                 if (igotlock) {
4654                     nfsv4_unlock(&clp->nfsc_lock, 0);
4655                     igotlock = 0;
4656                 }
4657                 if (tvp != NULL) {
4658                     np = VTONFS(tvp);
4659                     dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh,
4660                         np->n_fhp->nfh_len);
4661                     if (dp != NULL && *gottdp == 0) {
4662                         /*
4663                          * Wait for outstanding I/O ops to be done.
4664                          */
4665                         if (dp->nfsdl_rwlock.nfslock_usecnt > 0) {
4666                             dp->nfsdl_rwlock.nfslock_lock |= NFSV4LOCK_WANTED;
4667                             (void) nfsmsleep(&dp->nfsdl_rwlock,
4668                                 NFSCLSTATEMUTEXPTR, PZERO, "nfscld", NULL);
4669                             continue;
4670                         }
4671                         LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
4672                             if (!LIST_EMPTY(&owp->nfsow_open)) {
4673                                 NFSUNLOCKCLSTATE();
4674                                 return (retcnt);
4675                             }
4676                         }
4677                         LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
4678                             if (!LIST_EMPTY(&lp->nfsl_lock)) {
4679                                 NFSUNLOCKCLSTATE();
4680                                 return (retcnt);
4681                             }
4682                         }
4683                         *tstp = dp->nfsdl_stateid;
4684                         retcnt++;
4685                         *gottdp = 1;
4686                         nfscl_cleandeleg(dp);
4687                         nfscl_freedeleg(&clp->nfsc_deleg, dp, true);
4688                     }
4689                 }
4690                 NFSUNLOCKCLSTATE();
4691                 return (retcnt);
4692         }
4693 }
4694
4695 /*
4696  * Get a reference on the clientid associated with the mount point.
4697  * Return 1 if success, 0 otherwise.
4698  */
4699 int
4700 nfscl_getref(struct nfsmount *nmp)
4701 {
4702         struct nfsclclient *clp;
4703
4704         NFSLOCKCLSTATE();
4705         clp = nfscl_findcl(nmp);
4706         if (clp == NULL) {
4707                 NFSUNLOCKCLSTATE();
4708                 return (0);
4709         }
4710         nfsv4_getref(&clp->nfsc_lock, NULL, NFSCLSTATEMUTEXPTR, NULL);
4711         NFSUNLOCKCLSTATE();
4712         return (1);
4713 }
4714
4715 /*
4716  * Release a reference on a clientid acquired with the above call.
4717  */
4718 void
4719 nfscl_relref(struct nfsmount *nmp)
4720 {
4721         struct nfsclclient *clp;
4722
4723         NFSLOCKCLSTATE();
4724         clp = nfscl_findcl(nmp);
4725         if (clp == NULL) {
4726                 NFSUNLOCKCLSTATE();
4727                 return;
4728         }
4729         nfsv4_relref(&clp->nfsc_lock);
4730         NFSUNLOCKCLSTATE();
4731 }
4732
4733 /*
4734  * Save the size attribute in the delegation, since the nfsnode
4735  * is going away.
4736  */
4737 void
4738 nfscl_reclaimnode(vnode_t vp)
4739 {
4740         struct nfsclclient *clp;
4741         struct nfscldeleg *dp;
4742         struct nfsnode *np = VTONFS(vp);
4743         struct nfsmount *nmp;
4744
4745         nmp = VFSTONFS(vp->v_mount);
4746         if (!NFSHASNFSV4(nmp))
4747                 return;
4748         NFSLOCKCLSTATE();
4749         clp = nfscl_findcl(nmp);
4750         if (clp == NULL) {
4751                 NFSUNLOCKCLSTATE();
4752                 return;
4753         }
4754         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
4755         if (dp != NULL && (dp->nfsdl_flags & NFSCLDL_WRITE))
4756                 dp->nfsdl_size = np->n_size;
4757         NFSUNLOCKCLSTATE();
4758 }
4759
4760 /*
4761  * Get the saved size attribute in the delegation, since it is a
4762  * newly allocated nfsnode.
4763  */
4764 void
4765 nfscl_newnode(vnode_t vp)
4766 {
4767         struct nfsclclient *clp;
4768         struct nfscldeleg *dp;
4769         struct nfsnode *np = VTONFS(vp);
4770         struct nfsmount *nmp;
4771
4772         nmp = VFSTONFS(vp->v_mount);
4773         if (!NFSHASNFSV4(nmp))
4774                 return;
4775         NFSLOCKCLSTATE();
4776         clp = nfscl_findcl(nmp);
4777         if (clp == NULL) {
4778                 NFSUNLOCKCLSTATE();
4779                 return;
4780         }
4781         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
4782         if (dp != NULL && (dp->nfsdl_flags & NFSCLDL_WRITE))
4783                 np->n_size = dp->nfsdl_size;
4784         NFSUNLOCKCLSTATE();
4785 }
4786
4787 /*
4788  * If there is a valid write delegation for this file, set the modtime
4789  * to the local clock time.
4790  */
4791 void
4792 nfscl_delegmodtime(vnode_t vp)
4793 {
4794         struct nfsclclient *clp;
4795         struct nfscldeleg *dp;
4796         struct nfsnode *np = VTONFS(vp);
4797         struct nfsmount *nmp;
4798
4799         nmp = VFSTONFS(vp->v_mount);
4800         if (!NFSHASNFSV4(nmp))
4801                 return;
4802         NFSLOCKCLSTATE();
4803         clp = nfscl_findcl(nmp);
4804         if (clp == NULL) {
4805                 NFSUNLOCKCLSTATE();
4806                 return;
4807         }
4808         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
4809         if (dp != NULL && (dp->nfsdl_flags & NFSCLDL_WRITE)) {
4810                 nanotime(&dp->nfsdl_modtime);
4811                 dp->nfsdl_flags |= NFSCLDL_MODTIMESET;
4812         }
4813         NFSUNLOCKCLSTATE();
4814 }
4815
4816 /*
4817  * If there is a valid write delegation for this file with a modtime set,
4818  * put that modtime in mtime.
4819  */
4820 void
4821 nfscl_deleggetmodtime(vnode_t vp, struct timespec *mtime)
4822 {
4823         struct nfsclclient *clp;
4824         struct nfscldeleg *dp;
4825         struct nfsnode *np = VTONFS(vp);
4826         struct nfsmount *nmp;
4827
4828         nmp = VFSTONFS(vp->v_mount);
4829         if (!NFSHASNFSV4(nmp))
4830                 return;
4831         NFSLOCKCLSTATE();
4832         clp = nfscl_findcl(nmp);
4833         if (clp == NULL) {
4834                 NFSUNLOCKCLSTATE();
4835                 return;
4836         }
4837         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
4838         if (dp != NULL &&
4839             (dp->nfsdl_flags & (NFSCLDL_WRITE | NFSCLDL_MODTIMESET)) ==
4840             (NFSCLDL_WRITE | NFSCLDL_MODTIMESET))
4841                 *mtime = dp->nfsdl_modtime;
4842         NFSUNLOCKCLSTATE();
4843 }
4844
4845 static int
4846 nfscl_errmap(struct nfsrv_descript *nd, u_int32_t minorvers)
4847 {
4848         short *defaulterrp, *errp;
4849
4850         if (!nd->nd_repstat)
4851                 return (0);
4852         if (nd->nd_procnum == NFSPROC_NOOP)
4853                 return (txdr_unsigned(nd->nd_repstat & 0xffff));
4854         if (nd->nd_repstat == EBADRPC)
4855                 return (txdr_unsigned(NFSERR_BADXDR));
4856         if (nd->nd_repstat == NFSERR_MINORVERMISMATCH ||
4857             nd->nd_repstat == NFSERR_OPILLEGAL)
4858                 return (txdr_unsigned(nd->nd_repstat));
4859         if (nd->nd_repstat >= NFSERR_BADIOMODE && nd->nd_repstat < 20000 &&
4860             minorvers > NFSV4_MINORVERSION) {
4861                 /* NFSv4.n error. */
4862                 return (txdr_unsigned(nd->nd_repstat));
4863         }
4864         if (nd->nd_procnum < NFSV4OP_CBNOPS)
4865                 errp = defaulterrp = nfscl_cberrmap[nd->nd_procnum];
4866         else
4867                 return (txdr_unsigned(nd->nd_repstat));
4868         while (*++errp)
4869                 if (*errp == (short)nd->nd_repstat)
4870                         return (txdr_unsigned(nd->nd_repstat));
4871         return (txdr_unsigned(*defaulterrp));
4872 }
4873
4874 /*
4875  * Called to find/add a layout to a client.
4876  * This function returns the layout with a refcnt (shared lock) upon
4877  * success (returns 0) or with no lock/refcnt on the layout when an
4878  * error is returned.
4879  * If a layout is passed in via lypp, it is locked (exclusively locked).
4880  */
4881 int
4882 nfscl_layout(struct nfsmount *nmp, vnode_t vp, u_int8_t *fhp, int fhlen,
4883     nfsv4stateid_t *stateidp, int layouttype, int retonclose,
4884     struct nfsclflayouthead *fhlp, struct nfscllayout **lypp,
4885     struct ucred *cred, NFSPROC_T *p)
4886 {
4887         struct nfsclclient *clp;
4888         struct nfscllayout *lyp, *tlyp;
4889         struct nfsclflayout *flp;
4890         struct nfsnode *np = VTONFS(vp);
4891         mount_t mp;
4892         int layout_passed_in;
4893
4894         mp = nmp->nm_mountp;
4895         layout_passed_in = 1;
4896         tlyp = NULL;
4897         lyp = *lypp;
4898         if (lyp == NULL) {
4899                 layout_passed_in = 0;
4900                 tlyp = malloc(sizeof(*tlyp) + fhlen - 1, M_NFSLAYOUT,
4901                     M_WAITOK | M_ZERO);
4902         }
4903
4904         NFSLOCKCLSTATE();
4905         clp = nmp->nm_clp;
4906         if (clp == NULL) {
4907                 if (layout_passed_in != 0)
4908                         nfsv4_unlock(&lyp->nfsly_lock, 0);
4909                 NFSUNLOCKCLSTATE();
4910                 if (tlyp != NULL)
4911                         free(tlyp, M_NFSLAYOUT);
4912                 return (EPERM);
4913         }
4914         if (lyp == NULL) {
4915                 /*
4916                  * Although no lyp was passed in, another thread might have
4917                  * allocated one. If one is found, just increment it's ref
4918                  * count and return it.
4919                  */
4920                 lyp = nfscl_findlayout(clp, fhp, fhlen);
4921                 if (lyp == NULL) {
4922                         lyp = tlyp;
4923                         tlyp = NULL;
4924                         lyp->nfsly_stateid.seqid = stateidp->seqid;
4925                         lyp->nfsly_stateid.other[0] = stateidp->other[0];
4926                         lyp->nfsly_stateid.other[1] = stateidp->other[1];
4927                         lyp->nfsly_stateid.other[2] = stateidp->other[2];
4928                         lyp->nfsly_lastbyte = 0;
4929                         LIST_INIT(&lyp->nfsly_flayread);
4930                         LIST_INIT(&lyp->nfsly_flayrw);
4931                         LIST_INIT(&lyp->nfsly_recall);
4932                         lyp->nfsly_filesid[0] = np->n_vattr.na_filesid[0];
4933                         lyp->nfsly_filesid[1] = np->n_vattr.na_filesid[1];
4934                         lyp->nfsly_clp = clp;
4935                         if (layouttype == NFSLAYOUT_FLEXFILE)
4936                                 lyp->nfsly_flags = NFSLY_FLEXFILE;
4937                         else
4938                                 lyp->nfsly_flags = NFSLY_FILES;
4939                         if (retonclose != 0)
4940                                 lyp->nfsly_flags |= NFSLY_RETONCLOSE;
4941                         lyp->nfsly_fhlen = fhlen;
4942                         NFSBCOPY(fhp, lyp->nfsly_fh, fhlen);
4943                         TAILQ_INSERT_HEAD(&clp->nfsc_layout, lyp, nfsly_list);
4944                         LIST_INSERT_HEAD(NFSCLLAYOUTHASH(clp, fhp, fhlen), lyp,
4945                             nfsly_hash);
4946                         lyp->nfsly_timestamp = NFSD_MONOSEC + 120;
4947                         nfscl_layoutcnt++;
4948                 } else {
4949                         if (retonclose != 0)
4950                                 lyp->nfsly_flags |= NFSLY_RETONCLOSE;
4951                         if (stateidp->seqid > lyp->nfsly_stateid.seqid)
4952                                 lyp->nfsly_stateid.seqid = stateidp->seqid;
4953                         TAILQ_REMOVE(&clp->nfsc_layout, lyp, nfsly_list);
4954                         TAILQ_INSERT_HEAD(&clp->nfsc_layout, lyp, nfsly_list);
4955                         lyp->nfsly_timestamp = NFSD_MONOSEC + 120;
4956                 }
4957                 nfsv4_getref(&lyp->nfsly_lock, NULL, NFSCLSTATEMUTEXPTR, mp);
4958                 if (NFSCL_FORCEDISM(mp)) {
4959                         NFSUNLOCKCLSTATE();
4960                         if (tlyp != NULL)
4961                                 free(tlyp, M_NFSLAYOUT);
4962                         return (EPERM);
4963                 }
4964                 *lypp = lyp;
4965         } else if (stateidp->seqid > lyp->nfsly_stateid.seqid)
4966                 lyp->nfsly_stateid.seqid = stateidp->seqid;
4967
4968         /* Merge the new list of File Layouts into the list. */
4969         flp = LIST_FIRST(fhlp);
4970         if (flp != NULL) {
4971                 if (flp->nfsfl_iomode == NFSLAYOUTIOMODE_READ)
4972                         nfscl_mergeflayouts(&lyp->nfsly_flayread, fhlp);
4973                 else
4974                         nfscl_mergeflayouts(&lyp->nfsly_flayrw, fhlp);
4975         }
4976         if (layout_passed_in != 0)
4977                 nfsv4_unlock(&lyp->nfsly_lock, 1);
4978         NFSUNLOCKCLSTATE();
4979         if (tlyp != NULL)
4980                 free(tlyp, M_NFSLAYOUT);
4981         return (0);
4982 }
4983
4984 /*
4985  * Search for a layout by MDS file handle.
4986  * If one is found, it is returned with a refcnt (shared lock) iff
4987  * retflpp returned non-NULL and locked (exclusive locked) iff retflpp is
4988  * returned NULL.
4989  */
4990 struct nfscllayout *
4991 nfscl_getlayout(struct nfsclclient *clp, uint8_t *fhp, int fhlen,
4992     uint64_t off, struct nfsclflayout **retflpp, int *recalledp)
4993 {
4994         struct nfscllayout *lyp;
4995         mount_t mp;
4996         int error, igotlock;
4997
4998         mp = clp->nfsc_nmp->nm_mountp;
4999         *recalledp = 0;
5000         *retflpp = NULL;
5001         NFSLOCKCLSTATE();
5002         lyp = nfscl_findlayout(clp, fhp, fhlen);
5003         if (lyp != NULL) {
5004                 if ((lyp->nfsly_flags & NFSLY_RECALL) == 0) {
5005                         TAILQ_REMOVE(&clp->nfsc_layout, lyp, nfsly_list);
5006                         TAILQ_INSERT_HEAD(&clp->nfsc_layout, lyp, nfsly_list);
5007                         lyp->nfsly_timestamp = NFSD_MONOSEC + 120;
5008                         error = nfscl_findlayoutforio(lyp, off,
5009                             NFSV4OPEN_ACCESSREAD, retflpp);
5010                         if (error == 0)
5011                                 nfsv4_getref(&lyp->nfsly_lock, NULL,
5012                                     NFSCLSTATEMUTEXPTR, mp);
5013                         else {
5014                                 do {
5015                                         igotlock = nfsv4_lock(&lyp->nfsly_lock,
5016                                             1, NULL, NFSCLSTATEMUTEXPTR, mp);
5017                                 } while (igotlock == 0 && !NFSCL_FORCEDISM(mp));
5018                                 *retflpp = NULL;
5019                         }
5020                         if (NFSCL_FORCEDISM(mp)) {
5021                                 lyp = NULL;
5022                                 *recalledp = 1;
5023                         }
5024                 } else {
5025                         lyp = NULL;
5026                         *recalledp = 1;
5027                 }
5028         }
5029         NFSUNLOCKCLSTATE();
5030         return (lyp);
5031 }
5032
5033 /*
5034  * Search for a layout by MDS file handle. If one is found, mark in to be
5035  * recalled, if it already marked "return on close".
5036  */
5037 static void
5038 nfscl_retoncloselayout(vnode_t vp, struct nfsclclient *clp, uint8_t *fhp,
5039     int fhlen, struct nfsclrecalllayout **recallpp)
5040 {
5041         struct nfscllayout *lyp;
5042         uint32_t iomode;
5043
5044         if (vp->v_type != VREG || !NFSHASPNFS(VFSTONFS(vp->v_mount)) ||
5045             nfscl_enablecallb == 0 || nfs_numnfscbd == 0 ||
5046             (VTONFS(vp)->n_flag & NNOLAYOUT) != 0)
5047                 return;
5048         lyp = nfscl_findlayout(clp, fhp, fhlen);
5049         if (lyp != NULL && (lyp->nfsly_flags & (NFSLY_RETONCLOSE |
5050             NFSLY_RECALL)) == NFSLY_RETONCLOSE) {
5051                 iomode = 0;
5052                 if (!LIST_EMPTY(&lyp->nfsly_flayread))
5053                         iomode |= NFSLAYOUTIOMODE_READ;
5054                 if (!LIST_EMPTY(&lyp->nfsly_flayrw))
5055                         iomode |= NFSLAYOUTIOMODE_RW;
5056                 (void)nfscl_layoutrecall(NFSLAYOUTRETURN_FILE, lyp, iomode,
5057                     0, UINT64_MAX, lyp->nfsly_stateid.seqid, 0, 0, NULL,
5058                     *recallpp);
5059                 NFSCL_DEBUG(4, "retoncls recall iomode=%d\n", iomode);
5060                 *recallpp = NULL;
5061         }
5062 }
5063
5064 /*
5065  * Mark the layout to be recalled and with an error.
5066  * Also, disable the dsp from further use.
5067  */
5068 void
5069 nfscl_dserr(uint32_t op, uint32_t stat, struct nfscldevinfo *dp,
5070     struct nfscllayout *lyp, struct nfsclds *dsp)
5071 {
5072         struct nfsclrecalllayout *recallp;
5073         uint32_t iomode;
5074
5075         printf("DS being disabled, error=%d\n", stat);
5076         /* Set up the return of the layout. */
5077         recallp = malloc(sizeof(*recallp), M_NFSLAYRECALL, M_WAITOK);
5078         iomode = 0;
5079         NFSLOCKCLSTATE();
5080         if ((lyp->nfsly_flags & NFSLY_RECALL) == 0) {
5081                 if (!LIST_EMPTY(&lyp->nfsly_flayread))
5082                         iomode |= NFSLAYOUTIOMODE_READ;
5083                 if (!LIST_EMPTY(&lyp->nfsly_flayrw))
5084                         iomode |= NFSLAYOUTIOMODE_RW;
5085                 (void)nfscl_layoutrecall(NFSLAYOUTRETURN_FILE, lyp, iomode,
5086                     0, UINT64_MAX, lyp->nfsly_stateid.seqid, stat, op,
5087                     dp->nfsdi_deviceid, recallp);
5088                 NFSUNLOCKCLSTATE();
5089                 NFSCL_DEBUG(4, "nfscl_dserr recall iomode=%d\n", iomode);
5090         } else {
5091                 NFSUNLOCKCLSTATE();
5092                 free(recallp, M_NFSLAYRECALL);
5093         }
5094
5095         /* And shut the TCP connection down. */
5096         nfscl_cancelreqs(dsp);
5097 }
5098
5099 /*
5100  * Cancel all RPCs for this "dsp" by closing the connection.
5101  * Also, mark the session as defunct.
5102  * If NFSCLDS_SAMECONN is set, the connection is shared with other DSs and
5103  * cannot be shut down.
5104  */
5105 void
5106 nfscl_cancelreqs(struct nfsclds *dsp)
5107 {
5108         struct __rpc_client *cl;
5109         static int non_event;
5110
5111         NFSLOCKDS(dsp);
5112         if ((dsp->nfsclds_flags & (NFSCLDS_CLOSED | NFSCLDS_SAMECONN)) == 0 &&
5113             dsp->nfsclds_sockp != NULL &&
5114             dsp->nfsclds_sockp->nr_client != NULL) {
5115                 dsp->nfsclds_flags |= NFSCLDS_CLOSED;
5116                 cl = dsp->nfsclds_sockp->nr_client;
5117                 dsp->nfsclds_sess.nfsess_defunct = 1;
5118                 NFSUNLOCKDS(dsp);
5119                 CLNT_CLOSE(cl);
5120                 /*
5121                  * This 1sec sleep is done to reduce the number of reconnect
5122                  * attempts made on the DS while it has failed.
5123                  */
5124                 tsleep(&non_event, PVFS, "ndscls", hz);
5125                 return;
5126         }
5127         NFSUNLOCKDS(dsp);
5128 }
5129
5130 /*
5131  * Dereference a layout.
5132  */
5133 void
5134 nfscl_rellayout(struct nfscllayout *lyp, int exclocked)
5135 {
5136
5137         NFSLOCKCLSTATE();
5138         if (exclocked != 0)
5139                 nfsv4_unlock(&lyp->nfsly_lock, 0);
5140         else
5141                 nfsv4_relref(&lyp->nfsly_lock);
5142         NFSUNLOCKCLSTATE();
5143 }
5144
5145 /*
5146  * Search for a devinfo by deviceid. If one is found, return it after
5147  * acquiring a reference count on it.
5148  */
5149 struct nfscldevinfo *
5150 nfscl_getdevinfo(struct nfsclclient *clp, uint8_t *deviceid,
5151     struct nfscldevinfo *dip)
5152 {
5153
5154         NFSLOCKCLSTATE();
5155         if (dip == NULL)
5156                 dip = nfscl_finddevinfo(clp, deviceid);
5157         if (dip != NULL)
5158                 dip->nfsdi_refcnt++;
5159         NFSUNLOCKCLSTATE();
5160         return (dip);
5161 }
5162
5163 /*
5164  * Dereference a devinfo structure.
5165  */
5166 static void
5167 nfscl_reldevinfo_locked(struct nfscldevinfo *dip)
5168 {
5169
5170         dip->nfsdi_refcnt--;
5171         if (dip->nfsdi_refcnt == 0)
5172                 wakeup(&dip->nfsdi_refcnt);
5173 }
5174
5175 /*
5176  * Dereference a devinfo structure.
5177  */
5178 void
5179 nfscl_reldevinfo(struct nfscldevinfo *dip)
5180 {
5181
5182         NFSLOCKCLSTATE();
5183         nfscl_reldevinfo_locked(dip);
5184         NFSUNLOCKCLSTATE();
5185 }
5186
5187 /*
5188  * Find a layout for this file handle. Return NULL upon failure.
5189  */
5190 static struct nfscllayout *
5191 nfscl_findlayout(struct nfsclclient *clp, u_int8_t *fhp, int fhlen)
5192 {
5193         struct nfscllayout *lyp;
5194
5195         LIST_FOREACH(lyp, NFSCLLAYOUTHASH(clp, fhp, fhlen), nfsly_hash)
5196                 if (lyp->nfsly_fhlen == fhlen &&
5197                     !NFSBCMP(lyp->nfsly_fh, fhp, fhlen))
5198                         break;
5199         return (lyp);
5200 }
5201
5202 /*
5203  * Find a devinfo for this deviceid. Return NULL upon failure.
5204  */
5205 static struct nfscldevinfo *
5206 nfscl_finddevinfo(struct nfsclclient *clp, uint8_t *deviceid)
5207 {
5208         struct nfscldevinfo *dip;
5209
5210         LIST_FOREACH(dip, &clp->nfsc_devinfo, nfsdi_list)
5211                 if (NFSBCMP(dip->nfsdi_deviceid, deviceid, NFSX_V4DEVICEID)
5212                     == 0)
5213                         break;
5214         return (dip);
5215 }
5216
5217 /*
5218  * Merge the new file layout list into the main one, maintaining it in
5219  * increasing offset order.
5220  */
5221 static void
5222 nfscl_mergeflayouts(struct nfsclflayouthead *fhlp,
5223     struct nfsclflayouthead *newfhlp)
5224 {
5225         struct nfsclflayout *flp, *nflp, *prevflp, *tflp;
5226
5227         flp = LIST_FIRST(fhlp);
5228         prevflp = NULL;
5229         LIST_FOREACH_SAFE(nflp, newfhlp, nfsfl_list, tflp) {
5230                 while (flp != NULL && flp->nfsfl_off < nflp->nfsfl_off) {
5231                         prevflp = flp;
5232                         flp = LIST_NEXT(flp, nfsfl_list);
5233                 }
5234                 if (prevflp == NULL)
5235                         LIST_INSERT_HEAD(fhlp, nflp, nfsfl_list);
5236                 else
5237                         LIST_INSERT_AFTER(prevflp, nflp, nfsfl_list);
5238                 prevflp = nflp;
5239         }
5240 }
5241
5242 /*
5243  * Add this nfscldevinfo to the client, if it doesn't already exist.
5244  * This function consumes the structure pointed at by dip, if not NULL.
5245  */
5246 int
5247 nfscl_adddevinfo(struct nfsmount *nmp, struct nfscldevinfo *dip, int ind,
5248     struct nfsclflayout *flp)
5249 {
5250         struct nfsclclient *clp;
5251         struct nfscldevinfo *tdip;
5252         uint8_t *dev;
5253
5254         NFSLOCKCLSTATE();
5255         clp = nmp->nm_clp;
5256         if (clp == NULL) {
5257                 NFSUNLOCKCLSTATE();
5258                 if (dip != NULL)
5259                         free(dip, M_NFSDEVINFO);
5260                 return (ENODEV);
5261         }
5262         if ((flp->nfsfl_flags & NFSFL_FILE) != 0)
5263                 dev = flp->nfsfl_dev;
5264         else
5265                 dev = flp->nfsfl_ffm[ind].dev;
5266         tdip = nfscl_finddevinfo(clp, dev);
5267         if (tdip != NULL) {
5268                 tdip->nfsdi_layoutrefs++;
5269                 if ((flp->nfsfl_flags & NFSFL_FILE) != 0)
5270                         flp->nfsfl_devp = tdip;
5271                 else
5272                         flp->nfsfl_ffm[ind].devp = tdip;
5273                 nfscl_reldevinfo_locked(tdip);
5274                 NFSUNLOCKCLSTATE();
5275                 if (dip != NULL)
5276                         free(dip, M_NFSDEVINFO);
5277                 return (0);
5278         }
5279         if (dip != NULL) {
5280                 LIST_INSERT_HEAD(&clp->nfsc_devinfo, dip, nfsdi_list);
5281                 dip->nfsdi_layoutrefs = 1;
5282                 if ((flp->nfsfl_flags & NFSFL_FILE) != 0)
5283                         flp->nfsfl_devp = dip;
5284                 else
5285                         flp->nfsfl_ffm[ind].devp = dip;
5286         }
5287         NFSUNLOCKCLSTATE();
5288         if (dip == NULL)
5289                 return (ENODEV);
5290         return (0);
5291 }
5292
5293 /*
5294  * Free up a layout structure and associated file layout structure(s).
5295  */
5296 void
5297 nfscl_freelayout(struct nfscllayout *layp)
5298 {
5299         struct nfsclflayout *flp, *nflp;
5300         struct nfsclrecalllayout *rp, *nrp;
5301
5302         LIST_FOREACH_SAFE(flp, &layp->nfsly_flayread, nfsfl_list, nflp) {
5303                 LIST_REMOVE(flp, nfsfl_list);
5304                 nfscl_freeflayout(flp);
5305         }
5306         LIST_FOREACH_SAFE(flp, &layp->nfsly_flayrw, nfsfl_list, nflp) {
5307                 LIST_REMOVE(flp, nfsfl_list);
5308                 nfscl_freeflayout(flp);
5309         }
5310         LIST_FOREACH_SAFE(rp, &layp->nfsly_recall, nfsrecly_list, nrp) {
5311                 LIST_REMOVE(rp, nfsrecly_list);
5312                 free(rp, M_NFSLAYRECALL);
5313         }
5314         nfscl_layoutcnt--;
5315         free(layp, M_NFSLAYOUT);
5316 }
5317
5318 /*
5319  * Free up a file layout structure.
5320  */
5321 void
5322 nfscl_freeflayout(struct nfsclflayout *flp)
5323 {
5324         int i, j;
5325
5326         if ((flp->nfsfl_flags & NFSFL_FILE) != 0) {
5327                 for (i = 0; i < flp->nfsfl_fhcnt; i++)
5328                         free(flp->nfsfl_fh[i], M_NFSFH);
5329                 if (flp->nfsfl_devp != NULL)
5330                         flp->nfsfl_devp->nfsdi_layoutrefs--;
5331         }
5332         if ((flp->nfsfl_flags & NFSFL_FLEXFILE) != 0)
5333                 for (i = 0; i < flp->nfsfl_mirrorcnt; i++) {
5334                         for (j = 0; j < flp->nfsfl_ffm[i].fhcnt; j++)
5335                                 free(flp->nfsfl_ffm[i].fh[j], M_NFSFH);
5336                         if (flp->nfsfl_ffm[i].devp != NULL)
5337                                 flp->nfsfl_ffm[i].devp->nfsdi_layoutrefs--;
5338                 }
5339         free(flp, M_NFSFLAYOUT);
5340 }
5341
5342 /*
5343  * Free up a file layout devinfo structure.
5344  */
5345 void
5346 nfscl_freedevinfo(struct nfscldevinfo *dip)
5347 {
5348
5349         free(dip, M_NFSDEVINFO);
5350 }
5351
5352 /*
5353  * Mark any layouts that match as recalled.
5354  */
5355 static int
5356 nfscl_layoutrecall(int recalltype, struct nfscllayout *lyp, uint32_t iomode,
5357     uint64_t off, uint64_t len, uint32_t stateseqid, uint32_t stat, uint32_t op,
5358     char *devid, struct nfsclrecalllayout *recallp)
5359 {
5360         struct nfsclrecalllayout *rp, *orp;
5361
5362         recallp->nfsrecly_recalltype = recalltype;
5363         recallp->nfsrecly_iomode = iomode;
5364         recallp->nfsrecly_stateseqid = stateseqid;
5365         recallp->nfsrecly_off = off;
5366         recallp->nfsrecly_len = len;
5367         recallp->nfsrecly_stat = stat;
5368         recallp->nfsrecly_op = op;
5369         if (devid != NULL)
5370                 NFSBCOPY(devid, recallp->nfsrecly_devid, NFSX_V4DEVICEID);
5371         /*
5372          * Order the list as file returns first, followed by fsid and any
5373          * returns, both in increasing stateseqid order.
5374          * Note that the seqids wrap around, so 1 is after 0xffffffff.
5375          * (I'm not sure this is correct because I find RFC5661 confusing
5376          *  on this, but hopefully it will work ok.)
5377          */
5378         orp = NULL;
5379         LIST_FOREACH(rp, &lyp->nfsly_recall, nfsrecly_list) {
5380                 orp = rp;
5381                 if ((recalltype == NFSLAYOUTRETURN_FILE &&
5382                      (rp->nfsrecly_recalltype != NFSLAYOUTRETURN_FILE ||
5383                       nfscl_seq(stateseqid, rp->nfsrecly_stateseqid) != 0)) ||
5384                     (recalltype != NFSLAYOUTRETURN_FILE &&
5385                      rp->nfsrecly_recalltype != NFSLAYOUTRETURN_FILE &&
5386                      nfscl_seq(stateseqid, rp->nfsrecly_stateseqid) != 0)) {
5387                         LIST_INSERT_BEFORE(rp, recallp, nfsrecly_list);
5388                         break;
5389                 }
5390
5391                 /*
5392                  * Put any error return on all the file returns that will
5393                  * preceed this one.
5394                  */
5395                 if (rp->nfsrecly_recalltype == NFSLAYOUTRETURN_FILE &&
5396                    stat != 0 && rp->nfsrecly_stat == 0) {
5397                         rp->nfsrecly_stat = stat;
5398                         rp->nfsrecly_op = op;
5399                         if (devid != NULL)
5400                                 NFSBCOPY(devid, rp->nfsrecly_devid,
5401                                     NFSX_V4DEVICEID);
5402                 }
5403         }
5404         if (rp == NULL) {
5405                 if (orp == NULL)
5406                         LIST_INSERT_HEAD(&lyp->nfsly_recall, recallp,
5407                             nfsrecly_list);
5408                 else
5409                         LIST_INSERT_AFTER(orp, recallp, nfsrecly_list);
5410         }
5411         lyp->nfsly_flags |= NFSLY_RECALL;
5412         wakeup(lyp->nfsly_clp);
5413         return (0);
5414 }
5415
5416 /*
5417  * Compare the two seqids for ordering. The trick is that the seqids can
5418  * wrap around from 0xffffffff->0, so check for the cases where one
5419  * has wrapped around.
5420  * Return 1 if seqid1 comes before seqid2, 0 otherwise.
5421  */
5422 static int
5423 nfscl_seq(uint32_t seqid1, uint32_t seqid2)
5424 {
5425
5426         if (seqid2 > seqid1 && (seqid2 - seqid1) >= 0x7fffffff)
5427                 /* seqid2 has wrapped around. */
5428                 return (0);
5429         if (seqid1 > seqid2 && (seqid1 - seqid2) >= 0x7fffffff)
5430                 /* seqid1 has wrapped around. */
5431                 return (1);
5432         if (seqid1 <= seqid2)
5433                 return (1);
5434         return (0);
5435 }
5436
5437 /*
5438  * Do a layout return for each of the recalls.
5439  */
5440 static void
5441 nfscl_layoutreturn(struct nfsmount *nmp, struct nfscllayout *lyp,
5442     struct ucred *cred, NFSPROC_T *p)
5443 {
5444         struct nfsclrecalllayout *rp;
5445         nfsv4stateid_t stateid;
5446         int layouttype;
5447
5448         NFSBCOPY(lyp->nfsly_stateid.other, stateid.other, NFSX_STATEIDOTHER);
5449         stateid.seqid = lyp->nfsly_stateid.seqid;
5450         if ((lyp->nfsly_flags & NFSLY_FILES) != 0)
5451                 layouttype = NFSLAYOUT_NFSV4_1_FILES;
5452         else
5453                 layouttype = NFSLAYOUT_FLEXFILE;
5454         LIST_FOREACH(rp, &lyp->nfsly_recall, nfsrecly_list) {
5455                 (void)nfsrpc_layoutreturn(nmp, lyp->nfsly_fh,
5456                     lyp->nfsly_fhlen, 0, layouttype,
5457                     rp->nfsrecly_iomode, rp->nfsrecly_recalltype,
5458                     rp->nfsrecly_off, rp->nfsrecly_len,
5459                     &stateid, cred, p, rp->nfsrecly_stat, rp->nfsrecly_op,
5460                     rp->nfsrecly_devid);
5461         }
5462 }
5463
5464 /*
5465  * Do the layout commit for a file layout.
5466  */
5467 static void
5468 nfscl_dolayoutcommit(struct nfsmount *nmp, struct nfscllayout *lyp,
5469     struct ucred *cred, NFSPROC_T *p)
5470 {
5471         struct nfsclflayout *flp;
5472         uint64_t len;
5473         int error, layouttype;
5474
5475         if ((lyp->nfsly_flags & NFSLY_FILES) != 0)
5476                 layouttype = NFSLAYOUT_NFSV4_1_FILES;
5477         else
5478                 layouttype = NFSLAYOUT_FLEXFILE;
5479         LIST_FOREACH(flp, &lyp->nfsly_flayrw, nfsfl_list) {
5480                 if (layouttype == NFSLAYOUT_FLEXFILE &&
5481                     (flp->nfsfl_fflags & NFSFLEXFLAG_NO_LAYOUTCOMMIT) != 0) {
5482                         NFSCL_DEBUG(4, "Flex file: no layoutcommit\n");
5483                         /* If not supported, don't bother doing it. */
5484                         NFSLOCKMNT(nmp);
5485                         nmp->nm_state |= NFSSTA_NOLAYOUTCOMMIT;
5486                         NFSUNLOCKMNT(nmp);
5487                         break;
5488                 } else if (flp->nfsfl_off <= lyp->nfsly_lastbyte) {
5489                         len = flp->nfsfl_end - flp->nfsfl_off;
5490                         error = nfsrpc_layoutcommit(nmp, lyp->nfsly_fh,
5491                             lyp->nfsly_fhlen, 0, flp->nfsfl_off, len,
5492                             lyp->nfsly_lastbyte, &lyp->nfsly_stateid,
5493                             layouttype, cred, p, NULL);
5494                         NFSCL_DEBUG(4, "layoutcommit err=%d\n", error);
5495                         if (error == NFSERR_NOTSUPP) {
5496                                 /* If not supported, don't bother doing it. */
5497                                 NFSLOCKMNT(nmp);
5498                                 nmp->nm_state |= NFSSTA_NOLAYOUTCOMMIT;
5499                                 NFSUNLOCKMNT(nmp);
5500                                 break;
5501                         }
5502                 }
5503         }
5504 }
5505
5506 /*
5507  * Commit all layouts for a file (vnode).
5508  */
5509 int
5510 nfscl_layoutcommit(vnode_t vp, NFSPROC_T *p)
5511 {
5512         struct nfsclclient *clp;
5513         struct nfscllayout *lyp;
5514         struct nfsnode *np = VTONFS(vp);
5515         mount_t mp;
5516         struct nfsmount *nmp;
5517
5518         mp = vp->v_mount;
5519         nmp = VFSTONFS(mp);
5520         if (NFSHASNOLAYOUTCOMMIT(nmp))
5521                 return (0);
5522         NFSLOCKCLSTATE();
5523         clp = nmp->nm_clp;
5524         if (clp == NULL) {
5525                 NFSUNLOCKCLSTATE();
5526                 return (EPERM);
5527         }
5528         lyp = nfscl_findlayout(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
5529         if (lyp == NULL) {
5530                 NFSUNLOCKCLSTATE();
5531                 return (EPERM);
5532         }
5533         nfsv4_getref(&lyp->nfsly_lock, NULL, NFSCLSTATEMUTEXPTR, mp);
5534         if (NFSCL_FORCEDISM(mp)) {
5535                 NFSUNLOCKCLSTATE();
5536                 return (EPERM);
5537         }
5538 tryagain:
5539         if ((lyp->nfsly_flags & NFSLY_WRITTEN) != 0) {
5540                 lyp->nfsly_flags &= ~NFSLY_WRITTEN;
5541                 NFSUNLOCKCLSTATE();
5542                 NFSCL_DEBUG(4, "do layoutcommit2\n");
5543                 nfscl_dolayoutcommit(clp->nfsc_nmp, lyp, NFSPROCCRED(p), p);
5544                 NFSLOCKCLSTATE();
5545                 goto tryagain;
5546         }
5547         nfsv4_relref(&lyp->nfsly_lock);
5548         NFSUNLOCKCLSTATE();
5549         return (0);
5550 }