The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/nfsclient/nfs_clstate.c

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    1 /*-
    2  * Copyright (c) 2009 Rick Macklem, University of Guelph
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: releng/8.2/sys/fs/nfsclient/nfs_clstate.c 214819 2010-11-05 02:12:18Z rmacklem $");
   30 
   31 /*
   32  * These functions implement the client side state handling for NFSv4.
   33  * NFSv4 state handling:
   34  * - A lockowner is used to determine lock contention, so it
   35  *   corresponds directly to a Posix pid. (1 to 1 mapping)
   36  * - The correct granularity of an OpenOwner is not nearly so
   37  *   obvious. An OpenOwner does the following:
   38  *   - provides a serial sequencing of Open/Close/Lock-with-new-lockowner
   39  *   - is used to check for Open/Share contention (not applicable to
   40  *     this client, since all Opens are Deny_None)
   41  *   As such, I considered both extreme.
   42  *   1 OpenOwner per ClientID - Simple to manage, but fully serializes
   43  *   all Open, Close and Lock (with a new lockowner) Ops.
   44  *   1 OpenOwner for each Open - This one results in an OpenConfirm for
   45  *   every Open, for most servers.
   46  *   So, I chose to use the same mapping as I did for LockOwnwers.
   47  *   The main concern here is that you can end up with multiple Opens
   48  *   for the same File Handle, but on different OpenOwners (opens
   49  *   inherited from parents, grandparents...) and you do not know
   50  *   which of these the vnodeop close applies to. This is handled by
   51  *   delaying the Close Op(s) until all of the Opens have been closed.
   52  *   (It is not yet obvious if this is the correct granularity.)
   53  * - How the code handles serialization:
   54  *   - For the ClientId, it uses an exclusive lock while getting its
   55  *     SetClientId and during recovery. Otherwise, it uses a shared
   56  *     lock via a reference count.
   57  *   - For the rest of the data structures, it uses an SMP mutex
   58  *     (once the nfs client is SMP safe) and doesn't sleep while
   59  *     manipulating the linked lists.
   60  *   - The serialization of Open/Close/Lock/LockU falls out in the
   61  *     "wash", since OpenOwners and LockOwners are both mapped from
   62  *     Posix pid. In other words, there is only one Posix pid using
   63  *     any given owner, so that owner is serialized. (If you change
   64  *     the granularity of the OpenOwner, then code must be added to
   65  *     serialize Ops on the OpenOwner.)
   66  * - When to get rid of OpenOwners and LockOwners.
   67  *   - When a process exits, it calls nfscl_cleanup(), which goes
   68  *     through the client list looking for all Open and Lock Owners.
   69  *     When one is found, it is marked "defunct" or in the case of
   70  *     an OpenOwner without any Opens, freed.
   71  *     The renew thread scans for defunct Owners and gets rid of them,
   72  *     if it can. The LockOwners will also be deleted when the
   73  *     associated Open is closed.
   74  *   - If the LockU or Close Op(s) fail during close in a way
   75  *     that could be recovered upon retry, they are relinked to the
   76  *     ClientId's defunct open list and retried by the renew thread
   77  *     until they succeed or an unmount/recovery occurs.
   78  *     (Since we are done with them, they do not need to be recovered.)
   79  */
   80 
   81 #ifndef APPLEKEXT
   82 #include <fs/nfs/nfsport.h>
   83 
   84 /*
   85  * Global variables
   86  */
   87 extern struct nfsstats newnfsstats;
   88 extern struct nfsreqhead nfsd_reqq;
   89 NFSREQSPINLOCK;
   90 NFSCLSTATEMUTEX;
   91 int nfscl_inited = 0;
   92 struct nfsclhead nfsclhead;     /* Head of clientid list */
   93 int nfscl_deleghighwater = NFSCLDELEGHIGHWATER;
   94 #endif  /* !APPLEKEXT */
   95 
   96 static int nfscl_delegcnt = 0;
   97 static int nfscl_getopen(struct nfsclownerhead *, u_int8_t *, int, u_int8_t *,
   98     NFSPROC_T *, u_int32_t, struct nfsclowner **, struct nfsclopen **);
   99 static void nfscl_clrelease(struct nfsclclient *);
  100 static void nfscl_cleanclient(struct nfsclclient *);
  101 static void nfscl_expireclient(struct nfsclclient *, struct nfsmount *,
  102     struct ucred *, NFSPROC_T *);
  103 static int nfscl_expireopen(struct nfsclclient *, struct nfsclopen *,
  104     struct nfsmount *, struct ucred *, NFSPROC_T *);
  105 static void nfscl_recover(struct nfsclclient *, struct ucred *, NFSPROC_T *);
  106 static void nfscl_insertlock(struct nfscllockowner *, struct nfscllock *,
  107     struct nfscllock *, int);
  108 static int nfscl_updatelock(struct nfscllockowner *, struct nfscllock **,
  109     struct nfscllock **, int);
  110 static void nfscl_delegreturnall(struct nfsclclient *, NFSPROC_T *);
  111 static u_int32_t nfscl_nextcbident(void);
  112 static mount_t nfscl_getmnt(u_int32_t);
  113 static struct nfscldeleg *nfscl_finddeleg(struct nfsclclient *, u_int8_t *,
  114     int);
  115 static int nfscl_checkconflict(struct nfscllockownerhead *, struct nfscllock *,
  116     u_int8_t *, struct nfscllock **);
  117 static void nfscl_freelockowner(struct nfscllockowner *, int);
  118 static void nfscl_freealllocks(struct nfscllockownerhead *, int);
  119 static int nfscl_localconflict(struct nfsclclient *, u_int8_t *, int,
  120     struct nfscllock *, u_int8_t *, struct nfscldeleg *, struct nfscllock **);
  121 static void nfscl_newopen(struct nfsclclient *, struct nfscldeleg *,
  122     struct nfsclowner **, struct nfsclowner **, struct nfsclopen **,
  123     struct nfsclopen **, u_int8_t *, u_int8_t *, int, int *);
  124 static int nfscl_moveopen(vnode_t , struct nfsclclient *,
  125     struct nfsmount *, struct nfsclopen *, struct nfsclowner *,
  126     struct nfscldeleg *, struct ucred *, NFSPROC_T *);
  127 static void nfscl_totalrecall(struct nfsclclient *);
  128 static int nfscl_relock(vnode_t , struct nfsclclient *, struct nfsmount *,
  129     struct nfscllockowner *, struct nfscllock *, struct ucred *, NFSPROC_T *);
  130 static int nfscl_tryopen(struct nfsmount *, vnode_t , u_int8_t *, int,
  131     u_int8_t *, int, u_int32_t, struct nfsclopen *, u_int8_t *, int,
  132     struct nfscldeleg **, int, u_int32_t, struct ucred *, NFSPROC_T *);
  133 static int nfscl_trylock(struct nfsmount *, vnode_t , u_int8_t *,
  134     int, struct nfscllockowner *, int, int, u_int64_t, u_int64_t, short,
  135     struct ucred *, NFSPROC_T *);
  136 static int nfsrpc_reopen(struct nfsmount *, u_int8_t *, int, u_int32_t,
  137     struct nfsclopen *, struct nfscldeleg **, struct ucred *, NFSPROC_T *);
  138 static void nfscl_freedeleg(struct nfscldeleghead *, struct nfscldeleg *);
  139 static int nfscl_errmap(struct nfsrv_descript *);
  140 static void nfscl_cleanup_common(struct nfsclclient *, u_int8_t *);
  141 static int nfscl_recalldeleg(struct nfsclclient *, struct nfsmount *,
  142     struct nfscldeleg *, vnode_t, struct ucred *, NFSPROC_T *, int);
  143 static void nfscl_freeopenowner(struct nfsclowner *, int);
  144 static void nfscl_cleandeleg(struct nfscldeleg *);
  145 static int nfscl_trydelegreturn(struct nfscldeleg *, struct ucred *,
  146     struct nfsmount *, NFSPROC_T *);
  147 
  148 static short nfscberr_null[] = {
  149         0,
  150         0,
  151 };
  152 
  153 static short nfscberr_getattr[] = {
  154         NFSERR_RESOURCE,
  155         NFSERR_BADHANDLE,
  156         NFSERR_BADXDR,
  157         NFSERR_RESOURCE,
  158         NFSERR_SERVERFAULT,
  159         0,
  160 };
  161 
  162 static short nfscberr_recall[] = {
  163         NFSERR_RESOURCE,
  164         NFSERR_BADHANDLE,
  165         NFSERR_BADSTATEID,
  166         NFSERR_BADXDR,
  167         NFSERR_RESOURCE,
  168         NFSERR_SERVERFAULT,
  169         0,
  170 };
  171 
  172 static short *nfscl_cberrmap[] = {
  173         nfscberr_null,
  174         nfscberr_null,
  175         nfscberr_null,
  176         nfscberr_getattr,
  177         nfscberr_recall
  178 };
  179 
  180 #define NETFAMILY(clp) \
  181                 (((clp)->nfsc_flags & NFSCLFLAGS_AFINET6) ? AF_INET6 : AF_INET)
  182 
  183 /*
  184  * Called for an open operation.
  185  * If the nfhp argument is NULL, just get an openowner.
  186  */
  187 APPLESTATIC int
  188 nfscl_open(vnode_t vp, u_int8_t *nfhp, int fhlen, u_int32_t amode, int usedeleg,
  189     struct ucred *cred, NFSPROC_T *p, struct nfsclowner **owpp,
  190     struct nfsclopen **opp, int *newonep, int *retp, int lockit)
  191 {
  192         struct nfsclclient *clp;
  193         struct nfsclowner *owp, *nowp;
  194         struct nfsclopen *op = NULL, *nop = NULL;
  195         struct nfscldeleg *dp;
  196         struct nfsclownerhead *ohp;
  197         u_int8_t own[NFSV4CL_LOCKNAMELEN];
  198         int ret;
  199 
  200         if (newonep != NULL)
  201                 *newonep = 0;
  202         if (opp != NULL)
  203                 *opp = NULL;
  204         if (owpp != NULL)
  205                 *owpp = NULL;
  206 
  207         /*
  208          * Might need one or both of these, so MALLOC them now, to
  209          * avoid a tsleep() in MALLOC later.
  210          */
  211         MALLOC(nowp, struct nfsclowner *, sizeof (struct nfsclowner),
  212             M_NFSCLOWNER, M_WAITOK);
  213         if (nfhp != NULL)
  214             MALLOC(nop, struct nfsclopen *, sizeof (struct nfsclopen) +
  215                 fhlen - 1, M_NFSCLOPEN, M_WAITOK);
  216         ret = nfscl_getcl(vp, cred, p, &clp);
  217         if (ret != 0) {
  218                 FREE((caddr_t)nowp, M_NFSCLOWNER);
  219                 if (nop != NULL)
  220                         FREE((caddr_t)nop, M_NFSCLOPEN);
  221                 return (ret);
  222         }
  223 
  224         /*
  225          * Get the Open iff it already exists.
  226          * If none found, add the new one or return error, depending upon
  227          * "create".
  228          */
  229         nfscl_filllockowner(p, own);
  230         NFSLOCKCLSTATE();
  231         dp = NULL;
  232         /* First check the delegation list */
  233         if (nfhp != NULL && usedeleg) {
  234                 LIST_FOREACH(dp, NFSCLDELEGHASH(clp, nfhp, fhlen), nfsdl_hash) {
  235                         if (dp->nfsdl_fhlen == fhlen &&
  236                             !NFSBCMP(nfhp, dp->nfsdl_fh, fhlen)) {
  237                                 if (!(amode & NFSV4OPEN_ACCESSWRITE) ||
  238                                     (dp->nfsdl_flags & NFSCLDL_WRITE))
  239                                         break;
  240                                 dp = NULL;
  241                                 break;
  242                         }
  243                 }
  244         }
  245 
  246         if (dp != NULL)
  247                 ohp = &dp->nfsdl_owner;
  248         else
  249                 ohp = &clp->nfsc_owner;
  250         /* Now, search for an openowner */
  251         LIST_FOREACH(owp, ohp, nfsow_list) {
  252                 if (!NFSBCMP(owp->nfsow_owner, own, NFSV4CL_LOCKNAMELEN))
  253                         break;
  254         }
  255 
  256         /*
  257          * Create a new open, as required.
  258          */
  259         nfscl_newopen(clp, dp, &owp, &nowp, &op, &nop, own, nfhp, fhlen,
  260             newonep);
  261 
  262         /*
  263          * Serialize modifications to the open owner for multiple threads
  264          * within the same process using a read/write sleep lock.
  265          */
  266         if (lockit)
  267                 nfscl_lockexcl(&owp->nfsow_rwlock, NFSCLSTATEMUTEXPTR);
  268         NFSUNLOCKCLSTATE();
  269         if (nowp != NULL)
  270                 FREE((caddr_t)nowp, M_NFSCLOWNER);
  271         if (nop != NULL)
  272                 FREE((caddr_t)nop, M_NFSCLOPEN);
  273         if (owpp != NULL)
  274                 *owpp = owp;
  275         if (opp != NULL)
  276                 *opp = op;
  277         if (retp != NULL) {
  278                 if (nfhp != NULL && dp != NULL && nop == NULL)
  279                         /* new local open on delegation */
  280                         *retp = NFSCLOPEN_SETCRED;
  281                 else
  282                         *retp = NFSCLOPEN_OK;
  283         }
  284 
  285         /*
  286          * Now, check the mode on the open and return the appropriate
  287          * value.
  288          */
  289         if (op != NULL && (amode & ~(op->nfso_mode))) {
  290                 op->nfso_mode |= amode;
  291                 if (retp != NULL && dp == NULL)
  292                         *retp = NFSCLOPEN_DOOPEN;
  293         }
  294         return (0);
  295 }
  296 
  297 /*
  298  * Create a new open, as required.
  299  */
  300 static void
  301 nfscl_newopen(struct nfsclclient *clp, struct nfscldeleg *dp,
  302     struct nfsclowner **owpp, struct nfsclowner **nowpp, struct nfsclopen **opp,
  303     struct nfsclopen **nopp, u_int8_t *own, u_int8_t *fhp, int fhlen,
  304     int *newonep)
  305 {
  306         struct nfsclowner *owp = *owpp, *nowp;
  307         struct nfsclopen *op, *nop;
  308 
  309         if (nowpp != NULL)
  310                 nowp = *nowpp;
  311         else
  312                 nowp = NULL;
  313         if (nopp != NULL)
  314                 nop = *nopp;
  315         else
  316                 nop = NULL;
  317         if (owp == NULL && nowp != NULL) {
  318                 NFSBCOPY(own, nowp->nfsow_owner, NFSV4CL_LOCKNAMELEN);
  319                 LIST_INIT(&nowp->nfsow_open);
  320                 nowp->nfsow_clp = clp;
  321                 nowp->nfsow_seqid = 0;
  322                 nowp->nfsow_defunct = 0;
  323                 nfscl_lockinit(&nowp->nfsow_rwlock);
  324                 if (dp != NULL) {
  325                         newnfsstats.cllocalopenowners++;
  326                         LIST_INSERT_HEAD(&dp->nfsdl_owner, nowp, nfsow_list);
  327                 } else {
  328                         newnfsstats.clopenowners++;
  329                         LIST_INSERT_HEAD(&clp->nfsc_owner, nowp, nfsow_list);
  330                 }
  331                 owp = *owpp = nowp;
  332                 *nowpp = NULL;
  333                 if (newonep != NULL)
  334                         *newonep = 1;
  335         }
  336 
  337          /* If an fhp has been specified, create an Open as well. */
  338         if (fhp != NULL) {
  339                 /* and look for the correct open, based upon FH */
  340                 LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
  341                         if (op->nfso_fhlen == fhlen &&
  342                             !NFSBCMP(op->nfso_fh, fhp, fhlen))
  343                                 break;
  344                 }
  345                 if (op == NULL && nop != NULL) {
  346                         nop->nfso_own = owp;
  347                         nop->nfso_mode = 0;
  348                         nop->nfso_opencnt = 0;
  349                         nop->nfso_posixlock = 1;
  350                         nop->nfso_fhlen = fhlen;
  351                         NFSBCOPY(fhp, nop->nfso_fh, fhlen);
  352                         LIST_INIT(&nop->nfso_lock);
  353                         nop->nfso_stateid.seqid = 0;
  354                         nop->nfso_stateid.other[0] = 0;
  355                         nop->nfso_stateid.other[1] = 0;
  356                         nop->nfso_stateid.other[2] = 0;
  357                         if (dp != NULL) {
  358                                 TAILQ_REMOVE(&clp->nfsc_deleg, dp, nfsdl_list);
  359                                 TAILQ_INSERT_HEAD(&clp->nfsc_deleg, dp,
  360                                     nfsdl_list);
  361                                 dp->nfsdl_timestamp = NFSD_MONOSEC + 120;
  362                                 newnfsstats.cllocalopens++;
  363                         } else {
  364                                 newnfsstats.clopens++;
  365                         }
  366                         LIST_INSERT_HEAD(&owp->nfsow_open, nop, nfso_list);
  367                         *opp = nop;
  368                         *nopp = NULL;
  369                         if (newonep != NULL)
  370                                 *newonep = 1;
  371                 } else {
  372                         *opp = op;
  373                 }
  374         }
  375 }
  376 
  377 /*
  378  * Called to find/add a delegation to a client.
  379  */
  380 APPLESTATIC int
  381 nfscl_deleg(mount_t mp, struct nfsclclient *clp, u_int8_t *nfhp,
  382     int fhlen, struct ucred *cred, NFSPROC_T *p, struct nfscldeleg **dpp)
  383 {
  384         struct nfscldeleg *dp = *dpp, *tdp;
  385 
  386         /*
  387          * First, if we have received a Read delegation for a file on a
  388          * read/write file system, just return it, because they aren't
  389          * useful, imho.
  390          */
  391         if (mp != NULL && dp != NULL && !NFSMNT_RDONLY(mp) &&
  392             (dp->nfsdl_flags & NFSCLDL_READ)) {
  393                 (void) nfscl_trydelegreturn(dp, cred, VFSTONFS(mp), p);
  394                 FREE((caddr_t)dp, M_NFSCLDELEG);
  395                 *dpp = NULL;
  396                 return (0);
  397         }
  398 
  399         /* Look for the correct deleg, based upon FH */
  400         NFSLOCKCLSTATE();
  401         tdp = nfscl_finddeleg(clp, nfhp, fhlen);
  402         if (tdp == NULL) {
  403                 if (dp == NULL) {
  404                         NFSUNLOCKCLSTATE();
  405                         return (NFSERR_BADSTATEID);
  406                 }
  407                 *dpp = NULL;
  408                 TAILQ_INSERT_HEAD(&clp->nfsc_deleg, dp, nfsdl_list);
  409                 LIST_INSERT_HEAD(NFSCLDELEGHASH(clp, nfhp, fhlen), dp,
  410                     nfsdl_hash);
  411                 dp->nfsdl_timestamp = NFSD_MONOSEC + 120;
  412                 newnfsstats.cldelegates++;
  413                 nfscl_delegcnt++;
  414         } else {
  415                 /*
  416                  * Delegation already exists, what do we do if a new one??
  417                  */
  418                 if (dp != NULL) {
  419                         printf("Deleg already exists!\n");
  420                         FREE((caddr_t)dp, M_NFSCLDELEG);
  421                         *dpp = NULL;
  422                 } else {
  423                         *dpp = tdp;
  424                 }
  425         }
  426         NFSUNLOCKCLSTATE();
  427         return (0);
  428 }
  429 
  430 /*
  431  * Find a delegation for this file handle. Return NULL upon failure.
  432  */
  433 static struct nfscldeleg *
  434 nfscl_finddeleg(struct nfsclclient *clp, u_int8_t *fhp, int fhlen)
  435 {
  436         struct nfscldeleg *dp;
  437 
  438         LIST_FOREACH(dp, NFSCLDELEGHASH(clp, fhp, fhlen), nfsdl_hash) {
  439             if (dp->nfsdl_fhlen == fhlen &&
  440                 !NFSBCMP(dp->nfsdl_fh, fhp, fhlen))
  441                 break;
  442         }
  443         return (dp);
  444 }
  445 
  446 /*
  447  * Get a stateid for an I/O operation. First, look for an open and iff
  448  * found, return either a lockowner stateid or the open stateid.
  449  * If no Open is found, just return error and the special stateid of all zeros.
  450  */
  451 APPLESTATIC int
  452 nfscl_getstateid(vnode_t vp, u_int8_t *nfhp, int fhlen, u_int32_t mode,
  453     struct ucred *cred, NFSPROC_T *p, nfsv4stateid_t *stateidp,
  454     void **lckpp)
  455 {
  456         struct nfsclclient *clp;
  457         struct nfsclowner *owp;
  458         struct nfsclopen *op = NULL;
  459         struct nfscllockowner *lp;
  460         struct nfscldeleg *dp;
  461         struct nfsnode *np;
  462         u_int8_t own[NFSV4CL_LOCKNAMELEN];
  463         int error, done;
  464 
  465         *lckpp = NULL;
  466         /*
  467          * Initially, just set the special stateid of all zeros.
  468          */
  469         stateidp->seqid = 0;
  470         stateidp->other[0] = 0;
  471         stateidp->other[1] = 0;
  472         stateidp->other[2] = 0;
  473         if (vnode_vtype(vp) != VREG)
  474                 return (EISDIR);
  475         np = VTONFS(vp);
  476         NFSLOCKCLSTATE();
  477         clp = nfscl_findcl(VFSTONFS(vnode_mount(vp)));
  478         if (clp == NULL) {
  479                 NFSUNLOCKCLSTATE();
  480                 return (EACCES);
  481         }
  482 
  483         /*
  484          * Wait for recovery to complete.
  485          */
  486         while ((clp->nfsc_flags & NFSCLFLAGS_RECVRINPROG))
  487                 (void) nfsmsleep(&clp->nfsc_flags, NFSCLSTATEMUTEXPTR,
  488                     PZERO, "nfsrecvr", NULL);
  489 
  490         /*
  491          * First, look for a delegation.
  492          */
  493         LIST_FOREACH(dp, NFSCLDELEGHASH(clp, nfhp, fhlen), nfsdl_hash) {
  494                 if (dp->nfsdl_fhlen == fhlen &&
  495                     !NFSBCMP(nfhp, dp->nfsdl_fh, fhlen)) {
  496                         if (!(mode & NFSV4OPEN_ACCESSWRITE) ||
  497                             (dp->nfsdl_flags & NFSCLDL_WRITE)) {
  498                                 stateidp->seqid = dp->nfsdl_stateid.seqid;
  499                                 stateidp->other[0] = dp->nfsdl_stateid.other[0];
  500                                 stateidp->other[1] = dp->nfsdl_stateid.other[1];
  501                                 stateidp->other[2] = dp->nfsdl_stateid.other[2];
  502                                 if (!(np->n_flag & NDELEGRECALL)) {
  503                                         TAILQ_REMOVE(&clp->nfsc_deleg, dp,
  504                                             nfsdl_list);
  505                                         TAILQ_INSERT_HEAD(&clp->nfsc_deleg, dp,
  506                                             nfsdl_list);
  507                                         dp->nfsdl_timestamp = NFSD_MONOSEC +
  508                                             120;
  509                                         dp->nfsdl_rwlock.nfslock_usecnt++;
  510                                         *lckpp = (void *)&dp->nfsdl_rwlock;
  511                                 }
  512                                 NFSUNLOCKCLSTATE();
  513                                 return (0);
  514                         }
  515                         break;
  516                 }
  517         }
  518 
  519         if (p != NULL) {
  520                 /*
  521                  * If p != NULL, we want to search the parentage tree
  522                  * for a matching OpenOwner and use that.
  523                  */
  524                 nfscl_filllockowner(p, own);
  525                 error = nfscl_getopen(&clp->nfsc_owner, nfhp, fhlen, NULL, p,
  526                     mode, NULL, &op);
  527                 if (error == 0) {
  528                         /* now look for a lockowner */
  529                         LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
  530                                 if (!NFSBCMP(lp->nfsl_owner, own,
  531                                     NFSV4CL_LOCKNAMELEN)) {
  532                                         stateidp->seqid =
  533                                             lp->nfsl_stateid.seqid;
  534                                         stateidp->other[0] =
  535                                             lp->nfsl_stateid.other[0];
  536                                         stateidp->other[1] =
  537                                             lp->nfsl_stateid.other[1];
  538                                         stateidp->other[2] =
  539                                             lp->nfsl_stateid.other[2];
  540                                         NFSUNLOCKCLSTATE();
  541                                         return (0);
  542                                 }
  543                         }
  544                 }
  545         }
  546         if (op == NULL) {
  547                 /* If not found, just look for any OpenOwner that will work. */
  548                 done = 0;
  549                 owp = LIST_FIRST(&clp->nfsc_owner);
  550                 while (!done && owp != NULL) {
  551                         LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
  552                                 if (op->nfso_fhlen == fhlen &&
  553                                     !NFSBCMP(op->nfso_fh, nfhp, fhlen) &&
  554                                     (mode & op->nfso_mode) == mode) {
  555                                         done = 1;
  556                                         break;
  557                                 }
  558                         }
  559                         if (!done)
  560                                 owp = LIST_NEXT(owp, nfsow_list);
  561                 }
  562                 if (!done) {
  563                         NFSUNLOCKCLSTATE();
  564                         return (ENOENT);
  565                 }
  566                 /* for read aheads or write behinds, use the open cred */
  567                 newnfs_copycred(&op->nfso_cred, cred);
  568         }
  569 
  570         /*
  571          * No lock stateid, so return the open stateid.
  572          */
  573         stateidp->seqid = op->nfso_stateid.seqid;
  574         stateidp->other[0] = op->nfso_stateid.other[0];
  575         stateidp->other[1] = op->nfso_stateid.other[1];
  576         stateidp->other[2] = op->nfso_stateid.other[2];
  577         NFSUNLOCKCLSTATE();
  578         return (0);
  579 }
  580 
  581 /*
  582  * Get an existing open. Search up the parentage tree for a match and
  583  * return with the first one found.
  584  */
  585 static int
  586 nfscl_getopen(struct nfsclownerhead *ohp, u_int8_t *nfhp, int fhlen,
  587     u_int8_t *rown, NFSPROC_T *p, u_int32_t mode, struct nfsclowner **owpp,
  588     struct nfsclopen **opp)
  589 {
  590         struct nfsclowner *owp = NULL;
  591         struct nfsclopen *op;
  592         NFSPROC_T *nproc;
  593         u_int8_t own[NFSV4CL_LOCKNAMELEN], *ownp;
  594 
  595         nproc = p;
  596         op = NULL;
  597         while (op == NULL && (nproc != NULL || rown != NULL)) {
  598                 if (nproc != NULL) {
  599                         nfscl_filllockowner(nproc, own);
  600                         ownp = own;
  601                 } else {
  602                         ownp = rown;
  603                 }
  604                 /* Search the client list */
  605                 LIST_FOREACH(owp, ohp, nfsow_list) {
  606                         if (!NFSBCMP(owp->nfsow_owner, ownp,
  607                             NFSV4CL_LOCKNAMELEN))
  608                                 break;
  609                 }
  610                 if (owp != NULL) {
  611                         /* and look for the correct open */
  612                         LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
  613                                 if (op->nfso_fhlen == fhlen &&
  614                                     !NFSBCMP(op->nfso_fh, nfhp, fhlen)
  615                                     && (op->nfso_mode & mode) == mode) {
  616                                         break;
  617                                 }
  618                         }
  619                 }
  620                 if (rown != NULL)
  621                         break;
  622                 if (op == NULL)
  623                         nproc = nfscl_getparent(nproc);
  624         }
  625         if (op == NULL) {
  626                 return (EBADF);
  627         }
  628         if (owpp)
  629                 *owpp = owp;
  630         *opp = op;
  631         return (0);
  632 }
  633 
  634 /*
  635  * Release use of an open owner. Called when open operations are done
  636  * with the open owner.
  637  */
  638 APPLESTATIC void
  639 nfscl_ownerrelease(struct nfsclowner *owp, __unused int error,
  640     __unused int candelete, int unlocked)
  641 {
  642 
  643         if (owp == NULL)
  644                 return;
  645         NFSLOCKCLSTATE();
  646         if (!unlocked)
  647                 nfscl_lockunlock(&owp->nfsow_rwlock);
  648         nfscl_clrelease(owp->nfsow_clp);
  649         NFSUNLOCKCLSTATE();
  650 }
  651 
  652 /*
  653  * Release use of an open structure under an open owner.
  654  */
  655 APPLESTATIC void
  656 nfscl_openrelease(struct nfsclopen *op, int error, int candelete)
  657 {
  658         struct nfsclclient *clp;
  659         struct nfsclowner *owp;
  660 
  661         if (op == NULL)
  662                 return;
  663         NFSLOCKCLSTATE();
  664         owp = op->nfso_own;
  665         nfscl_lockunlock(&owp->nfsow_rwlock);
  666         clp = owp->nfsow_clp;
  667         if (error && candelete && op->nfso_opencnt == 0)
  668                 nfscl_freeopen(op, 0);
  669         nfscl_clrelease(clp);
  670         NFSUNLOCKCLSTATE();
  671 }
  672 
  673 /*
  674  * Called to get a clientid structure. It will optionally lock the
  675  * client data structures to do the SetClientId/SetClientId_confirm,
  676  * but will release that lock and return the clientid with a refernce
  677  * count on it.
  678  * If the "cred" argument is NULL, a new clientid should not be created.
  679  * If the "p" argument is NULL, a SetClientID/SetClientIDConfirm cannot
  680  * be done.
  681  * It always clpp with a reference count on it, unless returning an error.
  682  */
  683 APPLESTATIC int
  684 nfscl_getcl(vnode_t vp, struct ucred *cred, NFSPROC_T *p,
  685     struct nfsclclient **clpp)
  686 {
  687         struct nfsclclient *clp;
  688         struct nfsclclient *newclp = NULL;
  689         struct nfscllockowner *lp, *nlp;
  690         struct nfsmount *nmp = VFSTONFS(vnode_mount(vp));
  691         char uuid[HOSTUUIDLEN];
  692         int igotlock = 0, error, trystalecnt, clidinusedelay, i;
  693         u_int16_t idlen = 0;
  694 
  695         if (cred != NULL) {
  696                 getcredhostuuid(cred, uuid, sizeof uuid);
  697                 idlen = strlen(uuid);
  698                 if (idlen > 0)
  699                         idlen += sizeof (u_int64_t);
  700                 else
  701                         idlen += sizeof (u_int64_t) + 16; /* 16 random bytes */
  702                 MALLOC(newclp, struct nfsclclient *,
  703                     sizeof (struct nfsclclient) + idlen - 1, M_NFSCLCLIENT,
  704                     M_WAITOK);
  705         }
  706         NFSLOCKCLSTATE();
  707         clp = nmp->nm_clp;
  708         if (clp == NULL) {
  709                 if (newclp == NULL) {
  710                         NFSUNLOCKCLSTATE();
  711                         return (EACCES);
  712                 }
  713                 clp = newclp;
  714                 NFSBZERO((caddr_t)clp, sizeof(struct nfsclclient) + idlen - 1);
  715                 clp->nfsc_idlen = idlen;
  716                 LIST_INIT(&clp->nfsc_owner);
  717                 TAILQ_INIT(&clp->nfsc_deleg);
  718                 for (i = 0; i < NFSCLDELEGHASHSIZE; i++)
  719                         LIST_INIT(&clp->nfsc_deleghash[i]);
  720                 LIST_INIT(&clp->nfsc_defunctlockowner);
  721                 clp->nfsc_flags = NFSCLFLAGS_INITED;
  722                 clp->nfsc_clientidrev = 1;
  723                 clp->nfsc_cbident = nfscl_nextcbident();
  724                 nfscl_fillclid(nmp->nm_clval, uuid, clp->nfsc_id,
  725                     clp->nfsc_idlen);
  726                 LIST_INSERT_HEAD(&nfsclhead, clp, nfsc_list);
  727                 nmp->nm_clp = clp;
  728                 clp->nfsc_nmp = nmp;
  729                 NFSUNLOCKCLSTATE();
  730                 nfscl_start_renewthread(clp);
  731         } else {
  732                 NFSUNLOCKCLSTATE();
  733                 if (newclp != NULL)
  734                         FREE((caddr_t)newclp, M_NFSCLCLIENT);
  735         }
  736         NFSLOCKCLSTATE();
  737         while ((clp->nfsc_flags & NFSCLFLAGS_HASCLIENTID) == 0 && !igotlock)
  738                 igotlock = nfsv4_lock(&clp->nfsc_lock, 1, NULL,
  739                     NFSCLSTATEMUTEXPTR);
  740         if (!igotlock)
  741                 nfsv4_getref(&clp->nfsc_lock, NULL, NFSCLSTATEMUTEXPTR);
  742         NFSUNLOCKCLSTATE();
  743 
  744         /*
  745          * If it needs a clientid, do the setclientid now.
  746          */
  747         if ((clp->nfsc_flags & NFSCLFLAGS_HASCLIENTID) == 0) {
  748                 if (!igotlock)
  749                         panic("nfscl_clget");
  750                 if (p == NULL || cred == NULL) {
  751                         NFSLOCKCLSTATE();
  752                         nfsv4_unlock(&clp->nfsc_lock, 0);
  753                         NFSUNLOCKCLSTATE();
  754                         return (EACCES);
  755                 }
  756                 /* get rid of defunct lockowners */
  757                 LIST_FOREACH_SAFE(lp, &clp->nfsc_defunctlockowner, nfsl_list,
  758                     nlp) {
  759                         nfscl_freelockowner(lp, 0);
  760                 }
  761                 /*
  762                  * If RFC3530 Sec. 14.2.33 is taken literally,
  763                  * NFSERR_CLIDINUSE will be returned persistently for the
  764                  * case where a new mount of the same file system is using
  765                  * a different principal. In practice, NFSERR_CLIDINUSE is
  766                  * only returned when there is outstanding unexpired state
  767                  * on the clientid. As such, try for twice the lease
  768                  * interval, if we know what that is. Otherwise, make a
  769                  * wild ass guess.
  770                  * The case of returning NFSERR_STALECLIENTID is far less
  771                  * likely, but might occur if there is a significant delay
  772                  * between doing the SetClientID and SetClientIDConfirm Ops,
  773                  * such that the server throws away the clientid before
  774                  * receiving the SetClientIDConfirm.
  775                  */
  776                 if (clp->nfsc_renew > 0)
  777                         clidinusedelay = NFSCL_LEASE(clp->nfsc_renew) * 2;
  778                 else
  779                         clidinusedelay = 120;
  780                 trystalecnt = 3;
  781                 do {
  782                         error = nfsrpc_setclient(VFSTONFS(vnode_mount(vp)),
  783                             clp, cred, p);
  784                         if (error == NFSERR_STALECLIENTID ||
  785                             error == NFSERR_STALEDONTRECOVER ||
  786                             error == NFSERR_CLIDINUSE) {
  787                                 (void) nfs_catnap(PZERO, error, "nfs_setcl");
  788                         }
  789                 } while (((error == NFSERR_STALECLIENTID ||
  790                      error == NFSERR_STALEDONTRECOVER) && --trystalecnt > 0) ||
  791                     (error == NFSERR_CLIDINUSE && --clidinusedelay > 0));
  792                 if (error) {
  793                         NFSLOCKCLSTATE();
  794                         nfsv4_unlock(&clp->nfsc_lock, 0);
  795                         NFSUNLOCKCLSTATE();
  796                         return (error);
  797                 }
  798                 clp->nfsc_flags |= NFSCLFLAGS_HASCLIENTID;
  799         }
  800         if (igotlock) {
  801                 NFSLOCKCLSTATE();
  802                 nfsv4_unlock(&clp->nfsc_lock, 1);
  803                 NFSUNLOCKCLSTATE();
  804         }
  805 
  806         *clpp = clp;
  807         return (0);
  808 }
  809 
  810 /*
  811  * Get a reference to a clientid and return it, if valid.
  812  */
  813 APPLESTATIC struct nfsclclient *
  814 nfscl_findcl(struct nfsmount *nmp)
  815 {
  816         struct nfsclclient *clp;
  817 
  818         clp = nmp->nm_clp;
  819         if (clp == NULL || !(clp->nfsc_flags & NFSCLFLAGS_HASCLIENTID))
  820                 return (NULL);
  821         return (clp);
  822 }
  823 
  824 /*
  825  * Release the clientid structure. It may be locked or reference counted.
  826  */
  827 static void
  828 nfscl_clrelease(struct nfsclclient *clp)
  829 {
  830 
  831         if (clp->nfsc_lock.nfslock_lock & NFSV4LOCK_LOCK)
  832                 nfsv4_unlock(&clp->nfsc_lock, 0);
  833         else
  834                 nfsv4_relref(&clp->nfsc_lock);
  835 }
  836 
  837 /*
  838  * External call for nfscl_clrelease.
  839  */
  840 APPLESTATIC void
  841 nfscl_clientrelease(struct nfsclclient *clp)
  842 {
  843 
  844         NFSLOCKCLSTATE();
  845         if (clp->nfsc_lock.nfslock_lock & NFSV4LOCK_LOCK)
  846                 nfsv4_unlock(&clp->nfsc_lock, 0);
  847         else
  848                 nfsv4_relref(&clp->nfsc_lock);
  849         NFSUNLOCKCLSTATE();
  850 }
  851 
  852 /*
  853  * Called when wanting to lock a byte region.
  854  */
  855 APPLESTATIC int
  856 nfscl_getbytelock(vnode_t vp, u_int64_t off, u_int64_t len,
  857     short type, struct ucred *cred, NFSPROC_T *p, struct nfsclclient *rclp,
  858     int recovery, u_int8_t *rownp, u_int8_t *ropenownp,
  859     struct nfscllockowner **lpp, int *newonep, int *donelocallyp)
  860 {
  861         struct nfscllockowner *lp;
  862         struct nfsclopen *op;
  863         struct nfsclclient *clp;
  864         struct nfscllockowner *nlp;
  865         struct nfscllock *nlop, *otherlop;
  866         struct nfscldeleg *dp = NULL, *ldp = NULL;
  867         struct nfscllockownerhead *lhp = NULL;
  868         struct nfsnode *np;
  869         u_int8_t own[NFSV4CL_LOCKNAMELEN], *ownp;
  870         int error = 0, ret, donelocally = 0;
  871         u_int32_t mode;
  872 
  873         if (type == F_WRLCK)
  874                 mode = NFSV4OPEN_ACCESSWRITE;
  875         else
  876                 mode = NFSV4OPEN_ACCESSREAD;
  877         np = VTONFS(vp);
  878         *lpp = NULL;
  879         *newonep = 0;
  880         *donelocallyp = 0;
  881 
  882         /*
  883          * Might need these, so MALLOC them now, to
  884          * avoid a tsleep() in MALLOC later.
  885          */
  886         MALLOC(nlp, struct nfscllockowner *,
  887             sizeof (struct nfscllockowner), M_NFSCLLOCKOWNER, M_WAITOK);
  888         MALLOC(otherlop, struct nfscllock *,
  889             sizeof (struct nfscllock), M_NFSCLLOCK, M_WAITOK);
  890         MALLOC(nlop, struct nfscllock *,
  891             sizeof (struct nfscllock), M_NFSCLLOCK, M_WAITOK);
  892         nlop->nfslo_type = type;
  893         nlop->nfslo_first = off;
  894         if (len == NFS64BITSSET) {
  895                 nlop->nfslo_end = NFS64BITSSET;
  896         } else {
  897                 nlop->nfslo_end = off + len;
  898                 if (nlop->nfslo_end <= nlop->nfslo_first)
  899                         error = NFSERR_INVAL;
  900         }
  901 
  902         if (!error) {
  903                 if (recovery)
  904                         clp = rclp;
  905                 else
  906                         error = nfscl_getcl(vp, cred, p, &clp);
  907         }
  908         if (error) {
  909                 FREE((caddr_t)nlp, M_NFSCLLOCKOWNER);
  910                 FREE((caddr_t)otherlop, M_NFSCLLOCK);
  911                 FREE((caddr_t)nlop, M_NFSCLLOCK);
  912                 return (error);
  913         }
  914 
  915         op = NULL;
  916         if (recovery) {
  917                 ownp = rownp;
  918         } else {
  919                 nfscl_filllockowner(p, own);
  920                 ownp = own;
  921         }
  922         if (!recovery) {
  923                 NFSLOCKCLSTATE();
  924                 /*
  925                  * First, search for a delegation. If one exists for this file,
  926                  * the lock can be done locally against it, so long as there
  927                  * isn't a local lock conflict.
  928                  */
  929                 ldp = dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh,
  930                     np->n_fhp->nfh_len);
  931                 /* Just sanity check for correct type of delegation */
  932                 if (dp != NULL && ((dp->nfsdl_flags &
  933                     (NFSCLDL_RECALL | NFSCLDL_DELEGRET)) != 0 ||
  934                      (type == F_WRLCK &&
  935                       (dp->nfsdl_flags & NFSCLDL_WRITE) == 0)))
  936                         dp = NULL;
  937         }
  938         if (dp != NULL) {
  939                 /* Now, find the associated open to get the correct openowner */
  940                 ret = nfscl_getopen(&dp->nfsdl_owner, np->n_fhp->nfh_fh,
  941                     np->n_fhp->nfh_len, NULL, p, mode, NULL, &op);
  942                 if (ret)
  943                         ret = nfscl_getopen(&clp->nfsc_owner,
  944                             np->n_fhp->nfh_fh, np->n_fhp->nfh_len, NULL, p,
  945                             mode, NULL, &op);
  946                 if (!ret) {
  947                         lhp = &dp->nfsdl_lock;
  948                         TAILQ_REMOVE(&clp->nfsc_deleg, dp, nfsdl_list);
  949                         TAILQ_INSERT_HEAD(&clp->nfsc_deleg, dp, nfsdl_list);
  950                         dp->nfsdl_timestamp = NFSD_MONOSEC + 120;
  951                         donelocally = 1;
  952                 } else {
  953                         dp = NULL;
  954                 }
  955         }
  956         if (!donelocally) {
  957                 /*
  958                  * Get the related Open.
  959                  */
  960                 if (recovery)
  961                         error = nfscl_getopen(&clp->nfsc_owner,
  962                             np->n_fhp->nfh_fh, np->n_fhp->nfh_len, ropenownp,
  963                             NULL, mode, NULL, &op);
  964                 else
  965                         error = nfscl_getopen(&clp->nfsc_owner,
  966                             np->n_fhp->nfh_fh, np->n_fhp->nfh_len, NULL, p,
  967                             mode, NULL, &op);
  968                 if (!error)
  969                         lhp = &op->nfso_lock;
  970         }
  971         if (!error && !recovery)
  972                 error = nfscl_localconflict(clp, np->n_fhp->nfh_fh,
  973                     np->n_fhp->nfh_len, nlop, ownp, ldp, NULL);
  974         if (error) {
  975                 if (!recovery) {
  976                         nfscl_clrelease(clp);
  977                         NFSUNLOCKCLSTATE();
  978                 }
  979                 FREE((caddr_t)nlp, M_NFSCLLOCKOWNER);
  980                 FREE((caddr_t)otherlop, M_NFSCLLOCK);
  981                 FREE((caddr_t)nlop, M_NFSCLLOCK);
  982                 return (error);
  983         }
  984 
  985         /*
  986          * Ok, see if a lockowner exists and create one, as required.
  987          */
  988         LIST_FOREACH(lp, lhp, nfsl_list) {
  989                 if (!NFSBCMP(lp->nfsl_owner, ownp, NFSV4CL_LOCKNAMELEN))
  990                         break;
  991         }
  992         if (lp == NULL) {
  993                 NFSBCOPY(ownp, nlp->nfsl_owner, NFSV4CL_LOCKNAMELEN);
  994                 if (recovery)
  995                         NFSBCOPY(ropenownp, nlp->nfsl_openowner,
  996                             NFSV4CL_LOCKNAMELEN);
  997                 else
  998                         NFSBCOPY(op->nfso_own->nfsow_owner, nlp->nfsl_openowner,
  999                             NFSV4CL_LOCKNAMELEN);
 1000                 nlp->nfsl_seqid = 0;
 1001                 nlp->nfsl_defunct = 0;
 1002                 nlp->nfsl_inprog = NULL;
 1003                 nfscl_lockinit(&nlp->nfsl_rwlock);
 1004                 LIST_INIT(&nlp->nfsl_lock);
 1005                 if (donelocally) {
 1006                         nlp->nfsl_open = NULL;
 1007                         newnfsstats.cllocallockowners++;
 1008                 } else {
 1009                         nlp->nfsl_open = op;
 1010                         newnfsstats.cllockowners++;
 1011                 }
 1012                 LIST_INSERT_HEAD(lhp, nlp, nfsl_list);
 1013                 lp = nlp;
 1014                 nlp = NULL;
 1015                 *newonep = 1;
 1016         }
 1017 
 1018         /*
 1019          * Now, update the byte ranges for locks.
 1020          */
 1021         ret = nfscl_updatelock(lp, &nlop, &otherlop, donelocally);
 1022         if (!ret)
 1023                 donelocally = 1;
 1024         if (donelocally) {
 1025                 *donelocallyp = 1;
 1026                 if (!recovery)
 1027                         nfscl_clrelease(clp);
 1028         } else {
 1029                 /*
 1030                  * Serial modifications on the lock owner for multiple threads
 1031                  * for the same process using a read/write lock.
 1032                  */
 1033                 if (!recovery)
 1034                         nfscl_lockexcl(&lp->nfsl_rwlock, NFSCLSTATEMUTEXPTR);
 1035         }
 1036         if (!recovery)
 1037                 NFSUNLOCKCLSTATE();
 1038 
 1039         if (nlp)
 1040                 FREE((caddr_t)nlp, M_NFSCLLOCKOWNER);
 1041         if (nlop)
 1042                 FREE((caddr_t)nlop, M_NFSCLLOCK);
 1043         if (otherlop)
 1044                 FREE((caddr_t)otherlop, M_NFSCLLOCK);
 1045 
 1046         *lpp = lp;
 1047         return (0);
 1048 }
 1049 
 1050 /*
 1051  * Called to unlock a byte range, for LockU.
 1052  */
 1053 APPLESTATIC int
 1054 nfscl_relbytelock(vnode_t vp, u_int64_t off, u_int64_t len,
 1055     __unused struct ucred *cred, NFSPROC_T *p, int callcnt,
 1056     struct nfsclclient *clp, struct nfscllockowner **lpp, int *dorpcp)
 1057 {
 1058         struct nfscllockowner *lp;
 1059         struct nfsclowner *owp;
 1060         struct nfsclopen *op;
 1061         struct nfscllock *nlop, *other_lop = NULL;
 1062         struct nfscldeleg *dp;
 1063         struct nfsnode *np;
 1064         u_int8_t own[NFSV4CL_LOCKNAMELEN];
 1065         int ret = 0, fnd;
 1066 
 1067         np = VTONFS(vp);
 1068         *lpp = NULL;
 1069         *dorpcp = 0;
 1070 
 1071         /*
 1072          * Might need these, so MALLOC them now, to
 1073          * avoid a tsleep() in MALLOC later.
 1074          */
 1075         MALLOC(nlop, struct nfscllock *,
 1076             sizeof (struct nfscllock), M_NFSCLLOCK, M_WAITOK);
 1077         nlop->nfslo_type = F_UNLCK;
 1078         nlop->nfslo_first = off;
 1079         if (len == NFS64BITSSET) {
 1080                 nlop->nfslo_end = NFS64BITSSET;
 1081         } else {
 1082                 nlop->nfslo_end = off + len;
 1083                 if (nlop->nfslo_end <= nlop->nfslo_first) {
 1084                         FREE((caddr_t)nlop, M_NFSCLLOCK);
 1085                         return (NFSERR_INVAL);
 1086                 }
 1087         }
 1088         if (callcnt == 0) {
 1089                 MALLOC(other_lop, struct nfscllock *,
 1090                     sizeof (struct nfscllock), M_NFSCLLOCK, M_WAITOK);
 1091                 *other_lop = *nlop;
 1092         }
 1093         nfscl_filllockowner(p, own);
 1094         dp = NULL;
 1095         NFSLOCKCLSTATE();
 1096         if (callcnt == 0)
 1097                 dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh,
 1098                     np->n_fhp->nfh_len);
 1099 
 1100         /*
 1101          * First, unlock any local regions on a delegation.
 1102          */
 1103         if (dp != NULL) {
 1104                 /* Look for this lockowner. */
 1105                 LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
 1106                         if (!NFSBCMP(lp->nfsl_owner, own,
 1107                             NFSV4CL_LOCKNAMELEN))
 1108                                 break;
 1109                 }
 1110                 if (lp != NULL)
 1111                         /* Use other_lop, so nlop is still available */
 1112                         (void)nfscl_updatelock(lp, &other_lop, NULL, 1);
 1113         }
 1114 
 1115         /*
 1116          * Now, find a matching open/lockowner that hasn't already been done,
 1117          * as marked by nfsl_inprog.
 1118          */
 1119         lp = NULL;
 1120         fnd = 0;
 1121         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 1122             LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 1123                 if (op->nfso_fhlen == np->n_fhp->nfh_len &&
 1124                     !NFSBCMP(op->nfso_fh, np->n_fhp->nfh_fh, op->nfso_fhlen)) {
 1125                     LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
 1126                         if (lp->nfsl_inprog == NULL &&
 1127                             !NFSBCMP(lp->nfsl_owner, own,
 1128                              NFSV4CL_LOCKNAMELEN)) {
 1129                                 fnd = 1;
 1130                                 break;
 1131                         }
 1132                     }
 1133                     if (fnd)
 1134                         break;
 1135                 }
 1136             }
 1137             if (fnd)
 1138                 break;
 1139         }
 1140 
 1141         if (lp != NULL) {
 1142                 ret = nfscl_updatelock(lp, &nlop, NULL, 0);
 1143                 if (ret)
 1144                         *dorpcp = 1;
 1145                 /*
 1146                  * Serial modifications on the lock owner for multiple
 1147                  * threads for the same process using a read/write lock.
 1148                  */
 1149                 lp->nfsl_inprog = p;
 1150                 nfscl_lockexcl(&lp->nfsl_rwlock, NFSCLSTATEMUTEXPTR);
 1151                 *lpp = lp;
 1152         }
 1153         NFSUNLOCKCLSTATE();
 1154         if (nlop)
 1155                 FREE((caddr_t)nlop, M_NFSCLLOCK);
 1156         if (other_lop)
 1157                 FREE((caddr_t)other_lop, M_NFSCLLOCK);
 1158         return (0);
 1159 }
 1160 
 1161 /*
 1162  * Release all lockowners marked in progess for this process and file.
 1163  */
 1164 APPLESTATIC void
 1165 nfscl_releasealllocks(struct nfsclclient *clp, vnode_t vp, NFSPROC_T *p)
 1166 {
 1167         struct nfsclowner *owp;
 1168         struct nfsclopen *op;
 1169         struct nfscllockowner *lp;
 1170         struct nfsnode *np;
 1171         u_int8_t own[NFSV4CL_LOCKNAMELEN];
 1172 
 1173         np = VTONFS(vp);
 1174         nfscl_filllockowner(p, own);
 1175         NFSLOCKCLSTATE();
 1176         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 1177             LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 1178                 if (op->nfso_fhlen == np->n_fhp->nfh_len &&
 1179                     !NFSBCMP(op->nfso_fh, np->n_fhp->nfh_fh, op->nfso_fhlen)) {
 1180                     LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
 1181                         if (lp->nfsl_inprog == p &&
 1182                             !NFSBCMP(lp->nfsl_owner, own,
 1183                             NFSV4CL_LOCKNAMELEN)) {
 1184                             lp->nfsl_inprog = NULL;
 1185                             nfscl_lockunlock(&lp->nfsl_rwlock);
 1186                         }
 1187                     }
 1188                 }
 1189             }
 1190         }
 1191         nfscl_clrelease(clp);
 1192         NFSUNLOCKCLSTATE();
 1193 }
 1194 
 1195 /*
 1196  * Called to find out if any bytes within the byte range specified are
 1197  * write locked by the calling process. Used to determine if flushing
 1198  * is required before a LockU.
 1199  * If in doubt, return 1, so the flush will occur.
 1200  */
 1201 APPLESTATIC int
 1202 nfscl_checkwritelocked(vnode_t vp, struct flock *fl,
 1203     struct ucred *cred, NFSPROC_T *p)
 1204 {
 1205         struct nfsclowner *owp;
 1206         struct nfscllockowner *lp;
 1207         struct nfsclopen *op;
 1208         struct nfsclclient *clp;
 1209         struct nfscllock *lop;
 1210         struct nfscldeleg *dp;
 1211         struct nfsnode *np;
 1212         u_int64_t off, end;
 1213         u_int8_t own[NFSV4CL_LOCKNAMELEN];
 1214         int error = 0;
 1215 
 1216         np = VTONFS(vp);
 1217         switch (fl->l_whence) {
 1218         case SEEK_SET:
 1219         case SEEK_CUR:
 1220                 /*
 1221                  * Caller is responsible for adding any necessary offset
 1222                  * when SEEK_CUR is used.
 1223                  */
 1224                 off = fl->l_start;
 1225                 break;
 1226         case SEEK_END:
 1227                 off = np->n_size + fl->l_start;
 1228                 break;
 1229         default:
 1230                 return (1);
 1231         };
 1232         if (fl->l_len != 0) {
 1233                 end = off + fl->l_len;
 1234                 if (end < off)
 1235                         return (1);
 1236         } else {
 1237                 end = NFS64BITSSET;
 1238         }
 1239 
 1240         error = nfscl_getcl(vp, cred, p, &clp);
 1241         if (error)
 1242                 return (1);
 1243         nfscl_filllockowner(p, own);
 1244         NFSLOCKCLSTATE();
 1245 
 1246         /*
 1247          * First check the delegation locks.
 1248          */
 1249         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 1250         if (dp != NULL) {
 1251                 LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
 1252                         if (!NFSBCMP(lp->nfsl_owner, own,
 1253                             NFSV4CL_LOCKNAMELEN))
 1254                                 break;
 1255                 }
 1256                 if (lp != NULL) {
 1257                         LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
 1258                                 if (lop->nfslo_first >= end)
 1259                                         break;
 1260                                 if (lop->nfslo_end <= off)
 1261                                         continue;
 1262                                 if (lop->nfslo_type == F_WRLCK) {
 1263                                         nfscl_clrelease(clp);
 1264                                         NFSUNLOCKCLSTATE();
 1265                                         return (1);
 1266                                 }
 1267                         }
 1268                 }
 1269         }
 1270 
 1271         /*
 1272          * Now, check state against the server.
 1273          */
 1274         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 1275             LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 1276                 if (op->nfso_fhlen == np->n_fhp->nfh_len &&
 1277                     !NFSBCMP(op->nfso_fh, np->n_fhp->nfh_fh, op->nfso_fhlen)) {
 1278                     LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
 1279                         if (!NFSBCMP(lp->nfsl_owner, own,
 1280                             NFSV4CL_LOCKNAMELEN))
 1281                             break;
 1282                     }
 1283                     if (lp != NULL) {
 1284                         LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
 1285                             if (lop->nfslo_first >= end)
 1286                                 break;
 1287                             if (lop->nfslo_end <= off)
 1288                                 continue;
 1289                             if (lop->nfslo_type == F_WRLCK) {
 1290                                 nfscl_clrelease(clp);
 1291                                 NFSUNLOCKCLSTATE();
 1292                                 return (1);
 1293                             }
 1294                         }
 1295                     }
 1296                 }
 1297             }
 1298         }
 1299         nfscl_clrelease(clp);
 1300         NFSUNLOCKCLSTATE();
 1301         return (0);
 1302 }
 1303 
 1304 /*
 1305  * Release a byte range lock owner structure.
 1306  */
 1307 APPLESTATIC void
 1308 nfscl_lockrelease(struct nfscllockowner *lp, int error, int candelete)
 1309 {
 1310         struct nfsclclient *clp;
 1311 
 1312         if (lp == NULL)
 1313                 return;
 1314         NFSLOCKCLSTATE();
 1315         clp = lp->nfsl_open->nfso_own->nfsow_clp;
 1316         if (error != 0 && candelete &&
 1317             (lp->nfsl_rwlock.nfslock_lock & NFSV4LOCK_WANTED) == 0)
 1318                 nfscl_freelockowner(lp, 0);
 1319         else
 1320                 nfscl_lockunlock(&lp->nfsl_rwlock);
 1321         nfscl_clrelease(clp);
 1322         NFSUNLOCKCLSTATE();
 1323 }
 1324 
 1325 /*
 1326  * Free up an open structure and any associated byte range lock structures.
 1327  */
 1328 APPLESTATIC void
 1329 nfscl_freeopen(struct nfsclopen *op, int local)
 1330 {
 1331 
 1332         LIST_REMOVE(op, nfso_list);
 1333         nfscl_freealllocks(&op->nfso_lock, local);
 1334         FREE((caddr_t)op, M_NFSCLOPEN);
 1335         if (local)
 1336                 newnfsstats.cllocalopens--;
 1337         else
 1338                 newnfsstats.clopens--;
 1339 }
 1340 
 1341 /*
 1342  * Free up all lock owners and associated locks.
 1343  */
 1344 static void
 1345 nfscl_freealllocks(struct nfscllockownerhead *lhp, int local)
 1346 {
 1347         struct nfscllockowner *lp, *nlp;
 1348 
 1349         LIST_FOREACH_SAFE(lp, lhp, nfsl_list, nlp) {
 1350                 if ((lp->nfsl_rwlock.nfslock_lock & NFSV4LOCK_WANTED))
 1351                         panic("nfscllckw");
 1352                 nfscl_freelockowner(lp, local);
 1353         }
 1354 }
 1355 
 1356 /*
 1357  * Called for an Open when NFSERR_EXPIRED is received from the server.
 1358  * If there are no byte range locks nor a Share Deny lost, try to do a
 1359  * fresh Open. Otherwise, free the open.
 1360  */
 1361 static int
 1362 nfscl_expireopen(struct nfsclclient *clp, struct nfsclopen *op,
 1363     struct nfsmount *nmp, struct ucred *cred, NFSPROC_T *p)
 1364 {
 1365         struct nfscllockowner *lp;
 1366         struct nfscldeleg *dp;
 1367         int mustdelete = 0, error;
 1368 
 1369         /*
 1370          * Look for any byte range lock(s).
 1371          */
 1372         LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
 1373                 if (!LIST_EMPTY(&lp->nfsl_lock)) {
 1374                         mustdelete = 1;
 1375                         break;
 1376                 }
 1377         }
 1378 
 1379         /*
 1380          * If no byte range lock(s) nor a Share deny, try to re-open.
 1381          */
 1382         if (!mustdelete && (op->nfso_mode & NFSLCK_DENYBITS) == 0) {
 1383                 newnfs_copycred(&op->nfso_cred, cred);
 1384                 dp = NULL;
 1385                 error = nfsrpc_reopen(nmp, op->nfso_fh,
 1386                     op->nfso_fhlen, op->nfso_mode, op, &dp, cred, p);
 1387                 if (error) {
 1388                         mustdelete = 1;
 1389                         if (dp != NULL) {
 1390                                 FREE((caddr_t)dp, M_NFSCLDELEG);
 1391                                 dp = NULL;
 1392                         }
 1393                 }
 1394                 if (dp != NULL)
 1395                         nfscl_deleg(nmp->nm_mountp, clp, op->nfso_fh,
 1396                             op->nfso_fhlen, cred, p, &dp);
 1397         }
 1398 
 1399         /*
 1400          * If a byte range lock or Share deny or couldn't re-open, free it.
 1401          */
 1402         if (mustdelete)
 1403                 nfscl_freeopen(op, 0);
 1404         return (mustdelete);
 1405 }
 1406 
 1407 /*
 1408  * Free up an open owner structure.
 1409  */
 1410 static void
 1411 nfscl_freeopenowner(struct nfsclowner *owp, int local)
 1412 {
 1413 
 1414         LIST_REMOVE(owp, nfsow_list);
 1415         FREE((caddr_t)owp, M_NFSCLOWNER);
 1416         if (local)
 1417                 newnfsstats.cllocalopenowners--;
 1418         else
 1419                 newnfsstats.clopenowners--;
 1420 }
 1421 
 1422 /*
 1423  * Free up a byte range lock owner structure.
 1424  */
 1425 static void
 1426 nfscl_freelockowner(struct nfscllockowner *lp, int local)
 1427 {
 1428         struct nfscllock *lop, *nlop;
 1429 
 1430         LIST_REMOVE(lp, nfsl_list);
 1431         LIST_FOREACH_SAFE(lop, &lp->nfsl_lock, nfslo_list, nlop) {
 1432                 nfscl_freelock(lop, local);
 1433         }
 1434         FREE((caddr_t)lp, M_NFSCLLOCKOWNER);
 1435         if (local)
 1436                 newnfsstats.cllocallockowners--;
 1437         else
 1438                 newnfsstats.cllockowners--;
 1439 }
 1440 
 1441 /*
 1442  * Free up a byte range lock structure.
 1443  */
 1444 APPLESTATIC void
 1445 nfscl_freelock(struct nfscllock *lop, int local)
 1446 {
 1447 
 1448         LIST_REMOVE(lop, nfslo_list);
 1449         FREE((caddr_t)lop, M_NFSCLLOCK);
 1450         if (local)
 1451                 newnfsstats.cllocallocks--;
 1452         else
 1453                 newnfsstats.cllocks--;
 1454 }
 1455 
 1456 /*
 1457  * Clean out the state related to a delegation.
 1458  */
 1459 static void
 1460 nfscl_cleandeleg(struct nfscldeleg *dp)
 1461 {
 1462         struct nfsclowner *owp, *nowp;
 1463         struct nfsclopen *op;
 1464 
 1465         LIST_FOREACH_SAFE(owp, &dp->nfsdl_owner, nfsow_list, nowp) {
 1466                 op = LIST_FIRST(&owp->nfsow_open);
 1467                 if (op != NULL) {
 1468                         if (LIST_NEXT(op, nfso_list) != NULL)
 1469                                 panic("nfscleandel");
 1470                         nfscl_freeopen(op, 1);
 1471                 }
 1472                 nfscl_freeopenowner(owp, 1);
 1473         }
 1474         nfscl_freealllocks(&dp->nfsdl_lock, 1);
 1475 }
 1476 
 1477 /*
 1478  * Free a delegation.
 1479  */
 1480 static void
 1481 nfscl_freedeleg(struct nfscldeleghead *hdp, struct nfscldeleg *dp)
 1482 {
 1483 
 1484         TAILQ_REMOVE(hdp, dp, nfsdl_list);
 1485         LIST_REMOVE(dp, nfsdl_hash);
 1486         FREE((caddr_t)dp, M_NFSCLDELEG);
 1487         newnfsstats.cldelegates--;
 1488         nfscl_delegcnt--;
 1489 }
 1490 
 1491 /*
 1492  * Free up all state related to this client structure.
 1493  */
 1494 static void
 1495 nfscl_cleanclient(struct nfsclclient *clp)
 1496 {
 1497         struct nfsclowner *owp, *nowp;
 1498         struct nfsclopen *op, *nop;
 1499         struct nfscllockowner *lp, *nlp;
 1500 
 1501 
 1502         /* get rid of defunct lockowners */
 1503         LIST_FOREACH_SAFE(lp, &clp->nfsc_defunctlockowner, nfsl_list, nlp) {
 1504                 nfscl_freelockowner(lp, 0);
 1505         }
 1506 
 1507         /* Now, all the OpenOwners, etc. */
 1508         LIST_FOREACH_SAFE(owp, &clp->nfsc_owner, nfsow_list, nowp) {
 1509                 LIST_FOREACH_SAFE(op, &owp->nfsow_open, nfso_list, nop) {
 1510                         nfscl_freeopen(op, 0);
 1511                 }
 1512                 nfscl_freeopenowner(owp, 0);
 1513         }
 1514 }
 1515 
 1516 /*
 1517  * Called when an NFSERR_EXPIRED is received from the server.
 1518  */
 1519 static void
 1520 nfscl_expireclient(struct nfsclclient *clp, struct nfsmount *nmp,
 1521     struct ucred *cred, NFSPROC_T *p)
 1522 {
 1523         struct nfsclowner *owp, *nowp, *towp;
 1524         struct nfsclopen *op, *nop, *top;
 1525         struct nfscldeleg *dp, *ndp;
 1526         int ret, printed = 0;
 1527 
 1528         /*
 1529          * First, merge locally issued Opens into the list for the server.
 1530          */
 1531         dp = TAILQ_FIRST(&clp->nfsc_deleg);
 1532         while (dp != NULL) {
 1533             ndp = TAILQ_NEXT(dp, nfsdl_list);
 1534             owp = LIST_FIRST(&dp->nfsdl_owner);
 1535             while (owp != NULL) {
 1536                 nowp = LIST_NEXT(owp, nfsow_list);
 1537                 op = LIST_FIRST(&owp->nfsow_open);
 1538                 if (op != NULL) {
 1539                     if (LIST_NEXT(op, nfso_list) != NULL)
 1540                         panic("nfsclexp");
 1541                     LIST_FOREACH(towp, &clp->nfsc_owner, nfsow_list) {
 1542                         if (!NFSBCMP(towp->nfsow_owner, owp->nfsow_owner,
 1543                             NFSV4CL_LOCKNAMELEN))
 1544                             break;
 1545                     }
 1546                     if (towp != NULL) {
 1547                         /* Merge opens in */
 1548                         LIST_FOREACH(top, &towp->nfsow_open, nfso_list) {
 1549                             if (top->nfso_fhlen == op->nfso_fhlen &&
 1550                                 !NFSBCMP(top->nfso_fh, op->nfso_fh,
 1551                                  op->nfso_fhlen)) {
 1552                                 top->nfso_mode |= op->nfso_mode;
 1553                                 top->nfso_opencnt += op->nfso_opencnt;
 1554                                 break;
 1555                             }
 1556                         }
 1557                         if (top == NULL) {
 1558                             /* Just add the open to the owner list */
 1559                             LIST_REMOVE(op, nfso_list);
 1560                             op->nfso_own = towp;
 1561                             LIST_INSERT_HEAD(&towp->nfsow_open, op, nfso_list);
 1562                             newnfsstats.cllocalopens--;
 1563                             newnfsstats.clopens++;
 1564                         }
 1565                     } else {
 1566                         /* Just add the openowner to the client list */
 1567                         LIST_REMOVE(owp, nfsow_list);
 1568                         owp->nfsow_clp = clp;
 1569                         LIST_INSERT_HEAD(&clp->nfsc_owner, owp, nfsow_list);
 1570                         newnfsstats.cllocalopenowners--;
 1571                         newnfsstats.clopenowners++;
 1572                         newnfsstats.cllocalopens--;
 1573                         newnfsstats.clopens++;
 1574                     }
 1575                 }
 1576                 owp = nowp;
 1577             }
 1578             if (!printed && !LIST_EMPTY(&dp->nfsdl_lock)) {
 1579                 printed = 1;
 1580                 printf("nfsv4 expired locks lost\n");
 1581             }
 1582             nfscl_cleandeleg(dp);
 1583             nfscl_freedeleg(&clp->nfsc_deleg, dp);
 1584             dp = ndp;
 1585         }
 1586         if (!TAILQ_EMPTY(&clp->nfsc_deleg))
 1587             panic("nfsclexp");
 1588 
 1589         /*
 1590          * Now, try and reopen against the server.
 1591          */
 1592         LIST_FOREACH_SAFE(owp, &clp->nfsc_owner, nfsow_list, nowp) {
 1593                 owp->nfsow_seqid = 0;
 1594                 LIST_FOREACH_SAFE(op, &owp->nfsow_open, nfso_list, nop) {
 1595                         ret = nfscl_expireopen(clp, op, nmp, cred, p);
 1596                         if (ret && !printed) {
 1597                                 printed = 1;
 1598                                 printf("nfsv4 expired locks lost\n");
 1599                         }
 1600                 }
 1601                 if (LIST_EMPTY(&owp->nfsow_open))
 1602                         nfscl_freeopenowner(owp, 0);
 1603         }
 1604 }
 1605 
 1606 #ifndef __FreeBSD__
 1607 /*
 1608  * Called from exit() upon process termination.
 1609  */
 1610 APPLESTATIC void
 1611 nfscl_cleanup(NFSPROC_T *p)
 1612 {
 1613         struct nfsclclient *clp;
 1614         u_int8_t own[NFSV4CL_LOCKNAMELEN];
 1615 
 1616         if (!nfscl_inited)
 1617                 return;
 1618         nfscl_filllockowner(p, own);
 1619 
 1620         NFSLOCKCLSTATE();
 1621         /*
 1622          * Loop through all the clientids, looking for the OpenOwners.
 1623          */
 1624         LIST_FOREACH(clp, &nfsclhead, nfsc_list)
 1625                 nfscl_cleanup_common(clp, own);
 1626         NFSUNLOCKCLSTATE();
 1627 }
 1628 #endif  /* !__FreeBSD__ */
 1629 
 1630 /*
 1631  * Common code used by nfscl_cleanup() and nfscl_cleanupkext().
 1632  * Must be called with CLSTATE lock held.
 1633  */
 1634 static void
 1635 nfscl_cleanup_common(struct nfsclclient *clp, u_int8_t *own)
 1636 {
 1637         struct nfsclowner *owp, *nowp;
 1638         struct nfsclopen *op;
 1639         struct nfscllockowner *lp, *nlp;
 1640         struct nfscldeleg *dp;
 1641 
 1642         /* First, get rid of local locks on delegations. */
 1643         TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
 1644                 LIST_FOREACH_SAFE(lp, &dp->nfsdl_lock, nfsl_list, nlp) {
 1645                     if (!NFSBCMP(lp->nfsl_owner, own, NFSV4CL_LOCKNAMELEN)) {
 1646                         if ((lp->nfsl_rwlock.nfslock_lock & NFSV4LOCK_WANTED))
 1647                             panic("nfscllckw");
 1648                         nfscl_freelockowner(lp, 1);
 1649                     }
 1650                 }
 1651         }
 1652         owp = LIST_FIRST(&clp->nfsc_owner);
 1653         while (owp != NULL) {
 1654                 nowp = LIST_NEXT(owp, nfsow_list);
 1655                 if (!NFSBCMP(owp->nfsow_owner, own,
 1656                     NFSV4CL_LOCKNAMELEN)) {
 1657                         /*
 1658                          * If there are children that haven't closed the
 1659                          * file descriptors yet, the opens will still be
 1660                          * here. For that case, let the renew thread clear
 1661                          * out the OpenOwner later.
 1662                          */
 1663                         if (LIST_EMPTY(&owp->nfsow_open))
 1664                                 nfscl_freeopenowner(owp, 0);
 1665                         else
 1666                                 owp->nfsow_defunct = 1;
 1667                 } else {
 1668                         /* look for lockowners on other opens */
 1669                         LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 1670                                 LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
 1671                                         if (!NFSBCMP(lp->nfsl_owner, own,
 1672                                             NFSV4CL_LOCKNAMELEN))
 1673                                                 lp->nfsl_defunct = 1;
 1674                                 }
 1675                         }
 1676                 }
 1677                 owp = nowp;
 1678         }
 1679 
 1680         /* and check the defunct list */
 1681         LIST_FOREACH(lp, &clp->nfsc_defunctlockowner, nfsl_list) {
 1682                 if (!NFSBCMP(lp->nfsl_owner, own, NFSV4CL_LOCKNAMELEN))
 1683                     lp->nfsl_defunct = 1;
 1684         }
 1685 }
 1686 
 1687 #if defined(APPLEKEXT) || defined(__FreeBSD__)
 1688 /*
 1689  * Simulate the call nfscl_cleanup() by looking for open owners associated
 1690  * with processes that no longer exist, since a call to nfscl_cleanup()
 1691  * can't be patched into exit().
 1692  */
 1693 static void
 1694 nfscl_cleanupkext(struct nfsclclient *clp)
 1695 {
 1696         struct nfsclowner *owp, *nowp;
 1697         struct nfscllockowner *lp;
 1698 
 1699         NFSPROCLISTLOCK();
 1700         NFSLOCKCLSTATE();
 1701         LIST_FOREACH_SAFE(owp, &clp->nfsc_owner, nfsow_list, nowp) {
 1702                 if (nfscl_procdoesntexist(owp->nfsow_owner))
 1703                         nfscl_cleanup_common(clp, owp->nfsow_owner);
 1704         }
 1705 
 1706         /* and check the defunct list */
 1707         LIST_FOREACH(lp, &clp->nfsc_defunctlockowner, nfsl_list) {
 1708                 if (nfscl_procdoesntexist(lp->nfsl_owner))
 1709                         lp->nfsl_defunct = 1;
 1710         }
 1711         NFSUNLOCKCLSTATE();
 1712         NFSPROCLISTUNLOCK();
 1713 }
 1714 #endif  /* APPLEKEXT || __FreeBSD__ */
 1715 
 1716 /*
 1717  * Called from nfs umount to free up the clientid.
 1718  */
 1719 APPLESTATIC void
 1720 nfscl_umount(struct nfsmount *nmp, NFSPROC_T *p)
 1721 {
 1722         struct nfsclclient *clp;
 1723         struct ucred *cred;
 1724         int igotlock;
 1725 
 1726         clp = nmp->nm_clp;
 1727         if (clp != NULL) {
 1728                 if ((clp->nfsc_flags & NFSCLFLAGS_INITED) == 0)
 1729                         panic("nfscl umount");
 1730         
 1731                 /*
 1732                  * First, handshake with the nfscl renew thread, to terminate
 1733                  * it.
 1734                  */
 1735                 clp->nfsc_flags |= NFSCLFLAGS_UMOUNT;
 1736                 while (clp->nfsc_flags & NFSCLFLAGS_HASTHREAD)
 1737                         (void) tsleep((caddr_t)clp, PWAIT, "nfsclumnt", hz);
 1738         
 1739                 NFSLOCKCLSTATE();
 1740                 do {
 1741                         igotlock = nfsv4_lock(&clp->nfsc_lock, 1, NULL,
 1742                             NFSCLSTATEMUTEXPTR);
 1743                 } while (!igotlock);
 1744                 NFSUNLOCKCLSTATE();
 1745         
 1746                 /*
 1747                  * Free up all the state. It will expire on the server, but
 1748                  * maybe we should do a SetClientId/SetClientIdConfirm so
 1749                  * the server throws it away?
 1750                  */
 1751                 LIST_REMOVE(clp, nfsc_list);
 1752                 nfscl_delegreturnall(clp, p);
 1753                 cred = newnfs_getcred();
 1754                 (void) nfsrpc_setclient(nmp, clp, cred, p);
 1755                 nfscl_cleanclient(clp);
 1756                 nmp->nm_clp = NULL;
 1757                 NFSFREECRED(cred);
 1758                 FREE((caddr_t)clp, M_NFSCLCLIENT);
 1759         }
 1760 
 1761 }
 1762 
 1763 /*
 1764  * This function is called when a server replies with NFSERR_STALECLIENTID
 1765  * or NFSERR_STALESTATEID. It traverses the clientid lists, doing Opens
 1766  * and Locks with reclaim. If these fail, it deletes the corresponding state.
 1767  */
 1768 static void
 1769 nfscl_recover(struct nfsclclient *clp, struct ucred *cred, NFSPROC_T *p)
 1770 {
 1771         struct nfsclowner *owp, *nowp;
 1772         struct nfsclopen *op, *nop;
 1773         struct nfscllockowner *lp, *nlp;
 1774         struct nfscllock *lop, *nlop;
 1775         struct nfscldeleg *dp, *ndp, *tdp;
 1776         struct nfsmount *nmp;
 1777         struct ucred *tcred;
 1778         struct nfsclopenhead extra_open;
 1779         struct nfscldeleghead extra_deleg;
 1780         struct nfsreq *rep;
 1781         u_int64_t len;
 1782         u_int32_t delegtype = NFSV4OPEN_DELEGATEWRITE, mode;
 1783         int igotlock = 0, error, trycnt, firstlock, s;
 1784 
 1785         /*
 1786          * First, lock the client structure, so everyone else will
 1787          * block when trying to use state.
 1788          */
 1789         NFSLOCKCLSTATE();
 1790         clp->nfsc_flags |= NFSCLFLAGS_RECVRINPROG;
 1791         do {
 1792                 igotlock = nfsv4_lock(&clp->nfsc_lock, 1, NULL,
 1793                     NFSCLSTATEMUTEXPTR);
 1794         } while (!igotlock);
 1795         NFSUNLOCKCLSTATE();
 1796 
 1797         nmp = clp->nfsc_nmp;
 1798         if (nmp == NULL)
 1799                 panic("nfscl recover");
 1800         trycnt = 5;
 1801         do {
 1802                 error = nfsrpc_setclient(nmp, clp, cred, p);
 1803         } while ((error == NFSERR_STALECLIENTID ||
 1804              error == NFSERR_STALEDONTRECOVER) && --trycnt > 0);
 1805         if (error) {
 1806                 nfscl_cleanclient(clp);
 1807                 NFSLOCKCLSTATE();
 1808                 clp->nfsc_flags &= ~(NFSCLFLAGS_HASCLIENTID |
 1809                     NFSCLFLAGS_RECOVER | NFSCLFLAGS_RECVRINPROG);
 1810                 wakeup(&clp->nfsc_flags);
 1811                 nfsv4_unlock(&clp->nfsc_lock, 0);
 1812                 NFSUNLOCKCLSTATE();
 1813                 return;
 1814         }
 1815         clp->nfsc_flags |= NFSCLFLAGS_HASCLIENTID;
 1816         clp->nfsc_flags &= ~NFSCLFLAGS_RECOVER;
 1817 
 1818         /*
 1819          * Mark requests already queued on the server, so that they don't
 1820          * initiate another recovery cycle. Any requests already in the
 1821          * queue that handle state information will have the old stale
 1822          * clientid/stateid and will get a NFSERR_STALESTATEID or
 1823          * NFSERR_STALECLIENTID reply from the server. This will be
 1824          * translated to NFSERR_STALEDONTRECOVER when R_DONTRECOVER is set.
 1825          */
 1826         s = splsoftclock();
 1827         NFSLOCKREQ();
 1828         TAILQ_FOREACH(rep, &nfsd_reqq, r_chain) {
 1829                 if (rep->r_nmp == nmp)
 1830                         rep->r_flags |= R_DONTRECOVER;
 1831         }
 1832         NFSUNLOCKREQ();
 1833         splx(s);
 1834 
 1835         /* get rid of defunct lockowners */
 1836         LIST_FOREACH_SAFE(lp, &clp->nfsc_defunctlockowner, nfsl_list, nlp) {
 1837                 nfscl_freelockowner(lp, 0);
 1838         }
 1839 
 1840         /*
 1841          * Now, mark all delegations "need reclaim".
 1842          */
 1843         TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list)
 1844                 dp->nfsdl_flags |= NFSCLDL_NEEDRECLAIM;
 1845 
 1846         TAILQ_INIT(&extra_deleg);
 1847         LIST_INIT(&extra_open);
 1848         /*
 1849          * Now traverse the state lists, doing Open and Lock Reclaims.
 1850          */
 1851         tcred = newnfs_getcred();
 1852         owp = LIST_FIRST(&clp->nfsc_owner);
 1853         while (owp != NULL) {
 1854             nowp = LIST_NEXT(owp, nfsow_list);
 1855             owp->nfsow_seqid = 0;
 1856             op = LIST_FIRST(&owp->nfsow_open);
 1857             while (op != NULL) {
 1858                 nop = LIST_NEXT(op, nfso_list);
 1859                 if (error != NFSERR_NOGRACE) {
 1860                     /* Search for a delegation to reclaim with the open */
 1861                     TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
 1862                         if (!(dp->nfsdl_flags & NFSCLDL_NEEDRECLAIM))
 1863                             continue;
 1864                         if ((dp->nfsdl_flags & NFSCLDL_WRITE)) {
 1865                             mode = NFSV4OPEN_ACCESSWRITE;
 1866                             delegtype = NFSV4OPEN_DELEGATEWRITE;
 1867                         } else {
 1868                             mode = NFSV4OPEN_ACCESSREAD;
 1869                             delegtype = NFSV4OPEN_DELEGATEREAD;
 1870                         }
 1871                         if ((op->nfso_mode & mode) == mode &&
 1872                             op->nfso_fhlen == dp->nfsdl_fhlen &&
 1873                             !NFSBCMP(op->nfso_fh, dp->nfsdl_fh, op->nfso_fhlen))
 1874                             break;
 1875                     }
 1876                     ndp = dp;
 1877                     if (dp == NULL)
 1878                         delegtype = NFSV4OPEN_DELEGATENONE;
 1879                     newnfs_copycred(&op->nfso_cred, tcred);
 1880                     error = nfscl_tryopen(nmp, NULL, op->nfso_fh,
 1881                         op->nfso_fhlen, op->nfso_fh, op->nfso_fhlen,
 1882                         op->nfso_mode, op, NULL, 0, &ndp, 1, delegtype,
 1883                         tcred, p);
 1884                     if (!error) {
 1885                         /* Handle any replied delegation */
 1886                         if (ndp != NULL && ((ndp->nfsdl_flags & NFSCLDL_WRITE)
 1887                             || NFSMNT_RDONLY(nmp->nm_mountp))) {
 1888                             if ((ndp->nfsdl_flags & NFSCLDL_WRITE))
 1889                                 mode = NFSV4OPEN_ACCESSWRITE;
 1890                             else
 1891                                 mode = NFSV4OPEN_ACCESSREAD;
 1892                             TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
 1893                                 if (!(dp->nfsdl_flags & NFSCLDL_NEEDRECLAIM))
 1894                                     continue;
 1895                                 if ((op->nfso_mode & mode) == mode &&
 1896                                     op->nfso_fhlen == dp->nfsdl_fhlen &&
 1897                                     !NFSBCMP(op->nfso_fh, dp->nfsdl_fh,
 1898                                     op->nfso_fhlen)) {
 1899                                     dp->nfsdl_stateid = ndp->nfsdl_stateid;
 1900                                     dp->nfsdl_sizelimit = ndp->nfsdl_sizelimit;
 1901                                     dp->nfsdl_ace = ndp->nfsdl_ace;
 1902                                     dp->nfsdl_change = ndp->nfsdl_change;
 1903                                     dp->nfsdl_flags &= ~NFSCLDL_NEEDRECLAIM;
 1904                                     if ((ndp->nfsdl_flags & NFSCLDL_RECALL))
 1905                                         dp->nfsdl_flags |= NFSCLDL_RECALL;
 1906                                     FREE((caddr_t)ndp, M_NFSCLDELEG);
 1907                                     ndp = NULL;
 1908                                     break;
 1909                                 }
 1910                             }
 1911                         }
 1912                         if (ndp != NULL)
 1913                             TAILQ_INSERT_HEAD(&extra_deleg, ndp, nfsdl_list);
 1914 
 1915                         /* and reclaim all byte range locks */
 1916                         lp = LIST_FIRST(&op->nfso_lock);
 1917                         while (lp != NULL) {
 1918                             nlp = LIST_NEXT(lp, nfsl_list);
 1919                             lp->nfsl_seqid = 0;
 1920                             firstlock = 1;
 1921                             lop = LIST_FIRST(&lp->nfsl_lock);
 1922                             while (lop != NULL) {
 1923                                 nlop = LIST_NEXT(lop, nfslo_list);
 1924                                 if (lop->nfslo_end == NFS64BITSSET)
 1925                                     len = NFS64BITSSET;
 1926                                 else
 1927                                     len = lop->nfslo_end - lop->nfslo_first;
 1928                                 if (error != NFSERR_NOGRACE)
 1929                                     error = nfscl_trylock(nmp, NULL,
 1930                                         op->nfso_fh, op->nfso_fhlen, lp,
 1931                                         firstlock, 1, lop->nfslo_first, len,
 1932                                         lop->nfslo_type, tcred, p);
 1933                                 if (error != 0)
 1934                                     nfscl_freelock(lop, 0);
 1935                                 else
 1936                                     firstlock = 0;
 1937                                 lop = nlop;
 1938                             }
 1939                             /* If no locks, but a lockowner, just delete it. */
 1940                             if (LIST_EMPTY(&lp->nfsl_lock))
 1941                                 nfscl_freelockowner(lp, 0);
 1942                             lp = nlp;
 1943                         }
 1944                     } else {
 1945                         nfscl_freeopen(op, 0);
 1946                     }
 1947                 }
 1948                 op = nop;
 1949             }
 1950             owp = nowp;
 1951         }
 1952 
 1953         /*
 1954          * Now, try and get any delegations not yet reclaimed by cobbling
 1955          * to-gether an appropriate open.
 1956          */
 1957         nowp = NULL;
 1958         dp = TAILQ_FIRST(&clp->nfsc_deleg);
 1959         while (dp != NULL) {
 1960             ndp = TAILQ_NEXT(dp, nfsdl_list);
 1961             if ((dp->nfsdl_flags & NFSCLDL_NEEDRECLAIM)) {
 1962                 if (nowp == NULL) {
 1963                     MALLOC(nowp, struct nfsclowner *,
 1964                         sizeof (struct nfsclowner), M_NFSCLOWNER, M_WAITOK);
 1965                     /*
 1966                      * Name must be as long an largest possible
 1967                      * NFSV4CL_LOCKNAMELEN. 12 for now.
 1968                      */
 1969                     NFSBCOPY("RECLAIMDELEG", nowp->nfsow_owner,
 1970                         NFSV4CL_LOCKNAMELEN);
 1971                     LIST_INIT(&nowp->nfsow_open);
 1972                     nowp->nfsow_clp = clp;
 1973                     nowp->nfsow_seqid = 0;
 1974                     nowp->nfsow_defunct = 0;
 1975                     nfscl_lockinit(&nowp->nfsow_rwlock);
 1976                 }
 1977                 nop = NULL;
 1978                 if (error != NFSERR_NOGRACE) {
 1979                     MALLOC(nop, struct nfsclopen *, sizeof (struct nfsclopen) +
 1980                         dp->nfsdl_fhlen - 1, M_NFSCLOPEN, M_WAITOK);
 1981                     nop->nfso_own = nowp;
 1982                     if ((dp->nfsdl_flags & NFSCLDL_WRITE)) {
 1983                         nop->nfso_mode = NFSV4OPEN_ACCESSWRITE;
 1984                         delegtype = NFSV4OPEN_DELEGATEWRITE;
 1985                     } else {
 1986                         nop->nfso_mode = NFSV4OPEN_ACCESSREAD;
 1987                         delegtype = NFSV4OPEN_DELEGATEREAD;
 1988                     }
 1989                     nop->nfso_opencnt = 0;
 1990                     nop->nfso_posixlock = 1;
 1991                     nop->nfso_fhlen = dp->nfsdl_fhlen;
 1992                     NFSBCOPY(dp->nfsdl_fh, nop->nfso_fh, dp->nfsdl_fhlen);
 1993                     LIST_INIT(&nop->nfso_lock);
 1994                     nop->nfso_stateid.seqid = 0;
 1995                     nop->nfso_stateid.other[0] = 0;
 1996                     nop->nfso_stateid.other[1] = 0;
 1997                     nop->nfso_stateid.other[2] = 0;
 1998                     newnfs_copycred(&dp->nfsdl_cred, tcred);
 1999                     newnfs_copyincred(tcred, &nop->nfso_cred);
 2000                     tdp = NULL;
 2001                     error = nfscl_tryopen(nmp, NULL, nop->nfso_fh,
 2002                         nop->nfso_fhlen, nop->nfso_fh, nop->nfso_fhlen,
 2003                         nop->nfso_mode, nop, NULL, 0, &tdp, 1,
 2004                         delegtype, tcred, p);
 2005                     if (tdp != NULL) {
 2006                         if ((tdp->nfsdl_flags & NFSCLDL_WRITE))
 2007                             mode = NFSV4OPEN_ACCESSWRITE;
 2008                         else
 2009                             mode = NFSV4OPEN_ACCESSREAD;
 2010                         if ((nop->nfso_mode & mode) == mode &&
 2011                             nop->nfso_fhlen == tdp->nfsdl_fhlen &&
 2012                             !NFSBCMP(nop->nfso_fh, tdp->nfsdl_fh,
 2013                             nop->nfso_fhlen)) {
 2014                             dp->nfsdl_stateid = tdp->nfsdl_stateid;
 2015                             dp->nfsdl_sizelimit = tdp->nfsdl_sizelimit;
 2016                             dp->nfsdl_ace = tdp->nfsdl_ace;
 2017                             dp->nfsdl_change = tdp->nfsdl_change;
 2018                             dp->nfsdl_flags &= ~NFSCLDL_NEEDRECLAIM;
 2019                             if ((tdp->nfsdl_flags & NFSCLDL_RECALL))
 2020                                 dp->nfsdl_flags |= NFSCLDL_RECALL;
 2021                             FREE((caddr_t)tdp, M_NFSCLDELEG);
 2022                         } else {
 2023                             TAILQ_INSERT_HEAD(&extra_deleg, tdp, nfsdl_list);
 2024                         }
 2025                     }
 2026                 }
 2027                 if (error) {
 2028                     if (nop != NULL)
 2029                         FREE((caddr_t)nop, M_NFSCLOPEN);
 2030                     /*
 2031                      * Couldn't reclaim it, so throw the state
 2032                      * away. Ouch!!
 2033                      */
 2034                     nfscl_cleandeleg(dp);
 2035                     nfscl_freedeleg(&clp->nfsc_deleg, dp);
 2036                 } else {
 2037                     LIST_INSERT_HEAD(&extra_open, nop, nfso_list);
 2038                 }
 2039             }
 2040             dp = ndp;
 2041         }
 2042 
 2043         /*
 2044          * Now, get rid of extra Opens and Delegations.
 2045          */
 2046         LIST_FOREACH_SAFE(op, &extra_open, nfso_list, nop) {
 2047                 do {
 2048                         newnfs_copycred(&op->nfso_cred, tcred);
 2049                         error = nfscl_tryclose(op, tcred, nmp, p);
 2050                         if (error == NFSERR_GRACE)
 2051                                 (void) nfs_catnap(PZERO, error, "nfsexcls");
 2052                 } while (error == NFSERR_GRACE);
 2053                 LIST_REMOVE(op, nfso_list);
 2054                 FREE((caddr_t)op, M_NFSCLOPEN);
 2055         }
 2056         if (nowp != NULL)
 2057                 FREE((caddr_t)nowp, M_NFSCLOWNER);
 2058 
 2059         TAILQ_FOREACH_SAFE(dp, &extra_deleg, nfsdl_list, ndp) {
 2060                 do {
 2061                         newnfs_copycred(&dp->nfsdl_cred, tcred);
 2062                         error = nfscl_trydelegreturn(dp, tcred, nmp, p);
 2063                         if (error == NFSERR_GRACE)
 2064                                 (void) nfs_catnap(PZERO, error, "nfsexdlg");
 2065                 } while (error == NFSERR_GRACE);
 2066                 TAILQ_REMOVE(&extra_deleg, dp, nfsdl_list);
 2067                 FREE((caddr_t)dp, M_NFSCLDELEG);
 2068         }
 2069 
 2070         NFSLOCKCLSTATE();
 2071         clp->nfsc_flags &= ~NFSCLFLAGS_RECVRINPROG;
 2072         wakeup(&clp->nfsc_flags);
 2073         nfsv4_unlock(&clp->nfsc_lock, 0);
 2074         NFSUNLOCKCLSTATE();
 2075         NFSFREECRED(tcred);
 2076 }
 2077 
 2078 /*
 2079  * This function is called when a server replies with NFSERR_EXPIRED.
 2080  * It deletes all state for the client and does a fresh SetClientId/confirm.
 2081  * XXX Someday it should post a signal to the process(es) that hold the
 2082  * state, so they know that lock state has been lost.
 2083  */
 2084 APPLESTATIC int
 2085 nfscl_hasexpired(struct nfsclclient *clp, u_int32_t clidrev, NFSPROC_T *p)
 2086 {
 2087         struct nfscllockowner *lp, *nlp;
 2088         struct nfsmount *nmp;
 2089         struct ucred *cred;
 2090         int igotlock = 0, error, trycnt;
 2091 
 2092         /*
 2093          * If the clientid has gone away or a new SetClientid has already
 2094          * been done, just return ok.
 2095          */
 2096         if (clp == NULL || clidrev != clp->nfsc_clientidrev)
 2097                 return (0);
 2098 
 2099         /*
 2100          * First, lock the client structure, so everyone else will
 2101          * block when trying to use state. Also, use NFSCLFLAGS_EXPIREIT so
 2102          * that only one thread does the work.
 2103          */
 2104         NFSLOCKCLSTATE();
 2105         clp->nfsc_flags |= NFSCLFLAGS_EXPIREIT;
 2106         do {
 2107                 igotlock = nfsv4_lock(&clp->nfsc_lock, 1, NULL,
 2108                     NFSCLSTATEMUTEXPTR);
 2109         } while (!igotlock && (clp->nfsc_flags & NFSCLFLAGS_EXPIREIT));
 2110         if ((clp->nfsc_flags & NFSCLFLAGS_EXPIREIT) == 0) {
 2111                 if (igotlock)
 2112                         nfsv4_unlock(&clp->nfsc_lock, 0);
 2113                 NFSUNLOCKCLSTATE();
 2114                 return (0);
 2115         }
 2116         clp->nfsc_flags |= NFSCLFLAGS_RECVRINPROG;
 2117         NFSUNLOCKCLSTATE();
 2118 
 2119         nmp = clp->nfsc_nmp;
 2120         if (nmp == NULL)
 2121                 panic("nfscl expired");
 2122         cred = newnfs_getcred();
 2123         trycnt = 5;
 2124         do {
 2125                 error = nfsrpc_setclient(nmp, clp, cred, p);
 2126         } while ((error == NFSERR_STALECLIENTID ||
 2127              error == NFSERR_STALEDONTRECOVER) && --trycnt > 0);
 2128         if (error) {
 2129                 /*
 2130                  * Clear out any state.
 2131                  */
 2132                 nfscl_cleanclient(clp);
 2133                 NFSLOCKCLSTATE();
 2134                 clp->nfsc_flags &= ~(NFSCLFLAGS_HASCLIENTID |
 2135                     NFSCLFLAGS_RECOVER);
 2136         } else {
 2137                 /* get rid of defunct lockowners */
 2138                 LIST_FOREACH_SAFE(lp, &clp->nfsc_defunctlockowner, nfsl_list,
 2139                     nlp) {
 2140                         nfscl_freelockowner(lp, 0);
 2141                 }
 2142 
 2143                 /*
 2144                  * Expire the state for the client.
 2145                  */
 2146                 nfscl_expireclient(clp, nmp, cred, p);
 2147                 NFSLOCKCLSTATE();
 2148                 clp->nfsc_flags |= NFSCLFLAGS_HASCLIENTID;
 2149                 clp->nfsc_flags &= ~NFSCLFLAGS_RECOVER;
 2150         }
 2151         clp->nfsc_flags &= ~(NFSCLFLAGS_EXPIREIT | NFSCLFLAGS_RECVRINPROG);
 2152         wakeup(&clp->nfsc_flags);
 2153         nfsv4_unlock(&clp->nfsc_lock, 0);
 2154         NFSUNLOCKCLSTATE();
 2155         NFSFREECRED(cred);
 2156         return (error);
 2157 }
 2158 
 2159 /*
 2160  * This function inserts a lock in the list after insert_lop.
 2161  */
 2162 static void
 2163 nfscl_insertlock(struct nfscllockowner *lp, struct nfscllock *new_lop,
 2164     struct nfscllock *insert_lop, int local)
 2165 {
 2166 
 2167         if ((struct nfscllockowner *)insert_lop == lp)
 2168                 LIST_INSERT_HEAD(&lp->nfsl_lock, new_lop, nfslo_list);
 2169         else
 2170                 LIST_INSERT_AFTER(insert_lop, new_lop, nfslo_list);
 2171         if (local)
 2172                 newnfsstats.cllocallocks++;
 2173         else
 2174                 newnfsstats.cllocks++;
 2175 }
 2176 
 2177 /*
 2178  * This function updates the locking for a lock owner and given file. It
 2179  * maintains a list of lock ranges ordered on increasing file offset that
 2180  * are NFSCLLOCK_READ or NFSCLLOCK_WRITE and non-overlapping (aka POSIX style).
 2181  * It always adds new_lop to the list and sometimes uses the one pointed
 2182  * at by other_lopp.
 2183  * Returns 1 if the locks were modified, 0 otherwise.
 2184  */
 2185 static int
 2186 nfscl_updatelock(struct nfscllockowner *lp, struct nfscllock **new_lopp,
 2187     struct nfscllock **other_lopp, int local)
 2188 {
 2189         struct nfscllock *new_lop = *new_lopp;
 2190         struct nfscllock *lop, *tlop, *ilop;
 2191         struct nfscllock *other_lop;
 2192         int unlock = 0, modified = 0;
 2193         u_int64_t tmp;
 2194 
 2195         /*
 2196          * Work down the list until the lock is merged.
 2197          */
 2198         if (new_lop->nfslo_type == F_UNLCK)
 2199                 unlock = 1;
 2200         ilop = (struct nfscllock *)lp;
 2201         lop = LIST_FIRST(&lp->nfsl_lock);
 2202         while (lop != NULL) {
 2203             /*
 2204              * Only check locks for this file that aren't before the start of
 2205              * new lock's range.
 2206              */
 2207             if (lop->nfslo_end >= new_lop->nfslo_first) {
 2208                 if (new_lop->nfslo_end < lop->nfslo_first) {
 2209                     /*
 2210                      * If the new lock ends before the start of the
 2211                      * current lock's range, no merge, just insert
 2212                      * the new lock.
 2213                      */
 2214                     break;
 2215                 }
 2216                 if (new_lop->nfslo_type == lop->nfslo_type ||
 2217                     (new_lop->nfslo_first <= lop->nfslo_first &&
 2218                      new_lop->nfslo_end >= lop->nfslo_end)) {
 2219                     /*
 2220                      * This lock can be absorbed by the new lock/unlock.
 2221                      * This happens when it covers the entire range
 2222                      * of the old lock or is contiguous
 2223                      * with the old lock and is of the same type or an
 2224                      * unlock.
 2225                      */
 2226                     if (new_lop->nfslo_type != lop->nfslo_type ||
 2227                         new_lop->nfslo_first != lop->nfslo_first ||
 2228                         new_lop->nfslo_end != lop->nfslo_end)
 2229                         modified = 1;
 2230                     if (lop->nfslo_first < new_lop->nfslo_first)
 2231                         new_lop->nfslo_first = lop->nfslo_first;
 2232                     if (lop->nfslo_end > new_lop->nfslo_end)
 2233                         new_lop->nfslo_end = lop->nfslo_end;
 2234                     tlop = lop;
 2235                     lop = LIST_NEXT(lop, nfslo_list);
 2236                     nfscl_freelock(tlop, local);
 2237                     continue;
 2238                 }
 2239 
 2240                 /*
 2241                  * All these cases are for contiguous locks that are not the
 2242                  * same type, so they can't be merged.
 2243                  */
 2244                 if (new_lop->nfslo_first <= lop->nfslo_first) {
 2245                     /*
 2246                      * This case is where the new lock overlaps with the
 2247                      * first part of the old lock. Move the start of the
 2248                      * old lock to just past the end of the new lock. The
 2249                      * new lock will be inserted in front of the old, since
 2250                      * ilop hasn't been updated. (We are done now.)
 2251                      */
 2252                     if (lop->nfslo_first != new_lop->nfslo_end) {
 2253                         lop->nfslo_first = new_lop->nfslo_end;
 2254                         modified = 1;
 2255                     }
 2256                     break;
 2257                 }
 2258                 if (new_lop->nfslo_end >= lop->nfslo_end) {
 2259                     /*
 2260                      * This case is where the new lock overlaps with the
 2261                      * end of the old lock's range. Move the old lock's
 2262                      * end to just before the new lock's first and insert
 2263                      * the new lock after the old lock.
 2264                      * Might not be done yet, since the new lock could
 2265                      * overlap further locks with higher ranges.
 2266                      */
 2267                     if (lop->nfslo_end != new_lop->nfslo_first) {
 2268                         lop->nfslo_end = new_lop->nfslo_first;
 2269                         modified = 1;
 2270                     }
 2271                     ilop = lop;
 2272                     lop = LIST_NEXT(lop, nfslo_list);
 2273                     continue;
 2274                 }
 2275                 /*
 2276                  * The final case is where the new lock's range is in the
 2277                  * middle of the current lock's and splits the current lock
 2278                  * up. Use *other_lopp to handle the second part of the
 2279                  * split old lock range. (We are done now.)
 2280                  * For unlock, we use new_lop as other_lop and tmp, since
 2281                  * other_lop and new_lop are the same for this case.
 2282                  * We noted the unlock case above, so we don't need
 2283                  * new_lop->nfslo_type any longer.
 2284                  */
 2285                 tmp = new_lop->nfslo_first;
 2286                 if (unlock) {
 2287                     other_lop = new_lop;
 2288                     *new_lopp = NULL;
 2289                 } else {
 2290                     other_lop = *other_lopp;
 2291                     *other_lopp = NULL;
 2292                 }
 2293                 other_lop->nfslo_first = new_lop->nfslo_end;
 2294                 other_lop->nfslo_end = lop->nfslo_end;
 2295                 other_lop->nfslo_type = lop->nfslo_type;
 2296                 lop->nfslo_end = tmp;
 2297                 nfscl_insertlock(lp, other_lop, lop, local);
 2298                 ilop = lop;
 2299                 modified = 1;
 2300                 break;
 2301             }
 2302             ilop = lop;
 2303             lop = LIST_NEXT(lop, nfslo_list);
 2304             if (lop == NULL)
 2305                 break;
 2306         }
 2307 
 2308         /*
 2309          * Insert the new lock in the list at the appropriate place.
 2310          */
 2311         if (!unlock) {
 2312                 nfscl_insertlock(lp, new_lop, ilop, local);
 2313                 *new_lopp = NULL;
 2314                 modified = 1;
 2315         }
 2316         return (modified);
 2317 }
 2318 
 2319 /*
 2320  * This function must be run as a kernel thread.
 2321  * It does Renew Ops and recovery, when required.
 2322  */
 2323 APPLESTATIC void
 2324 nfscl_renewthread(struct nfsclclient *clp, NFSPROC_T *p)
 2325 {
 2326         struct nfsclowner *owp, *nowp;
 2327         struct nfsclopen *op;
 2328         struct nfscllockowner *lp, *nlp, *olp;
 2329         struct nfscldeleghead dh;
 2330         struct nfscllockownerhead lh;
 2331         struct nfscldeleg *dp, *ndp;
 2332         struct ucred *cred;
 2333         u_int32_t clidrev;
 2334         int error, cbpathdown, islept, igotlock, ret, clearok;
 2335         uint32_t recover_done_time = 0;
 2336 
 2337         cred = newnfs_getcred();
 2338         NFSLOCKCLSTATE();
 2339         clp->nfsc_flags |= NFSCLFLAGS_HASTHREAD;
 2340         NFSUNLOCKCLSTATE();
 2341         for(;;) {
 2342                 newnfs_setroot(cred);
 2343                 cbpathdown = 0;
 2344                 if (clp->nfsc_flags & NFSCLFLAGS_RECOVER) {
 2345                         /*
 2346                          * Only allow one recover within 1/2 of the lease
 2347                          * duration (nfsc_renew).
 2348                          */
 2349                         if (recover_done_time < NFSD_MONOSEC) {
 2350                                 recover_done_time = NFSD_MONOSEC +
 2351                                     clp->nfsc_renew;
 2352                                 nfscl_recover(clp, cred, p);
 2353                         } else {
 2354                                 NFSLOCKCLSTATE();
 2355                                 clp->nfsc_flags &= ~NFSCLFLAGS_RECOVER;
 2356                                 NFSUNLOCKCLSTATE();
 2357                         }
 2358                 }
 2359                 if (clp->nfsc_expire <= NFSD_MONOSEC &&
 2360                     (clp->nfsc_flags & NFSCLFLAGS_HASCLIENTID)) {
 2361                         clp->nfsc_expire = NFSD_MONOSEC + clp->nfsc_renew;
 2362                         clidrev = clp->nfsc_clientidrev;
 2363                         error = nfsrpc_renew(clp, cred, p);
 2364                         if (error == NFSERR_CBPATHDOWN)
 2365                             cbpathdown = 1;
 2366                         else if (error == NFSERR_STALECLIENTID) {
 2367                             NFSLOCKCLSTATE();
 2368                             clp->nfsc_flags |= NFSCLFLAGS_RECOVER;
 2369                             NFSUNLOCKCLSTATE();
 2370                         } else if (error == NFSERR_EXPIRED)
 2371                             (void) nfscl_hasexpired(clp, clidrev, p);
 2372                 }
 2373 
 2374                 LIST_INIT(&lh);
 2375                 TAILQ_INIT(&dh);
 2376                 NFSLOCKCLSTATE();
 2377                 if (cbpathdown)
 2378                         /* It's a Total Recall! */
 2379                         nfscl_totalrecall(clp);
 2380 
 2381                 /*
 2382                  * Now, handle defunct owners.
 2383                  */
 2384                 owp = LIST_FIRST(&clp->nfsc_owner);
 2385                 while (owp != NULL) {
 2386                     nowp = LIST_NEXT(owp, nfsow_list);
 2387                     if (LIST_EMPTY(&owp->nfsow_open)) {
 2388                         if (owp->nfsow_defunct)
 2389                             nfscl_freeopenowner(owp, 0);
 2390                     } else {
 2391                         LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 2392                             lp = LIST_FIRST(&op->nfso_lock);
 2393                             while (lp != NULL) {
 2394                                 nlp = LIST_NEXT(lp, nfsl_list);
 2395                                 if (lp->nfsl_defunct &&
 2396                                     LIST_EMPTY(&lp->nfsl_lock)) {
 2397                                     LIST_FOREACH(olp, &lh, nfsl_list) {
 2398                                         if (!NFSBCMP(olp->nfsl_owner,
 2399                                             lp->nfsl_owner,NFSV4CL_LOCKNAMELEN))
 2400                                             break;
 2401                                     }
 2402                                     if (olp == NULL) {
 2403                                         LIST_REMOVE(lp, nfsl_list);
 2404                                         LIST_INSERT_HEAD(&lh, lp, nfsl_list);
 2405                                     } else {
 2406                                         nfscl_freelockowner(lp, 0);
 2407                                     }
 2408                                 }
 2409                                 lp = nlp;
 2410                             }
 2411                         }
 2412                     }
 2413                     owp = nowp;
 2414                 }
 2415 
 2416                 /* also search the defunct list */
 2417                 lp = LIST_FIRST(&clp->nfsc_defunctlockowner);
 2418                 while (lp != NULL) {
 2419                     nlp = LIST_NEXT(lp, nfsl_list);
 2420                     if (lp->nfsl_defunct) {
 2421                         LIST_FOREACH(olp, &lh, nfsl_list) {
 2422                             if (!NFSBCMP(olp->nfsl_owner, lp->nfsl_owner,
 2423                                 NFSV4CL_LOCKNAMELEN))
 2424                                 break;
 2425                         }
 2426                         if (olp == NULL) {
 2427                             LIST_REMOVE(lp, nfsl_list);
 2428                             LIST_INSERT_HEAD(&lh, lp, nfsl_list);
 2429                         } else {
 2430                             nfscl_freelockowner(lp, 0);
 2431                         }
 2432                     }
 2433                     lp = nlp;
 2434                 }
 2435                 /* and release defunct lock owners */
 2436                 LIST_FOREACH_SAFE(lp, &lh, nfsl_list, nlp) {
 2437                     nfscl_freelockowner(lp, 0);
 2438                 }
 2439 
 2440                 /*
 2441                  * Do the recall on any delegations. To avoid trouble, always
 2442                  * come back up here after having slept.
 2443                  */
 2444                 igotlock = 0;
 2445 tryagain:
 2446                 dp = TAILQ_FIRST(&clp->nfsc_deleg);
 2447                 while (dp != NULL) {
 2448                         ndp = TAILQ_NEXT(dp, nfsdl_list);
 2449                         if ((dp->nfsdl_flags & NFSCLDL_RECALL)) {
 2450                                 /*
 2451                                  * Wait for outstanding I/O ops to be done.
 2452                                  */
 2453                                 if (dp->nfsdl_rwlock.nfslock_usecnt > 0) {
 2454                                     if (igotlock) {
 2455                                         nfsv4_unlock(&clp->nfsc_lock, 0);
 2456                                         igotlock = 0;
 2457                                     }
 2458                                     dp->nfsdl_rwlock.nfslock_lock |=
 2459                                         NFSV4LOCK_WANTED;
 2460                                     (void) nfsmsleep(&dp->nfsdl_rwlock,
 2461                                         NFSCLSTATEMUTEXPTR, PZERO, "nfscld",
 2462                                         NULL);
 2463                                     goto tryagain;
 2464                                 }
 2465                                 while (!igotlock) {
 2466                                     igotlock = nfsv4_lock(&clp->nfsc_lock, 1,
 2467                                         &islept, NFSCLSTATEMUTEXPTR);
 2468                                     if (islept)
 2469                                         goto tryagain;
 2470                                 }
 2471                                 NFSUNLOCKCLSTATE();
 2472                                 newnfs_copycred(&dp->nfsdl_cred, cred);
 2473                                 ret = nfscl_recalldeleg(clp, clp->nfsc_nmp, dp,
 2474                                     NULL, cred, p, 1);
 2475                                 if (!ret) {
 2476                                     nfscl_cleandeleg(dp);
 2477                                     TAILQ_REMOVE(&clp->nfsc_deleg, dp,
 2478                                         nfsdl_list);
 2479                                     LIST_REMOVE(dp, nfsdl_hash);
 2480                                     TAILQ_INSERT_HEAD(&dh, dp, nfsdl_list);
 2481                                     nfscl_delegcnt--;
 2482                                     newnfsstats.cldelegates--;
 2483                                 }
 2484                                 NFSLOCKCLSTATE();
 2485                         }
 2486                         dp = ndp;
 2487                 }
 2488 
 2489                 /*
 2490                  * Clear out old delegations, if we are above the high water
 2491                  * mark. Only clear out ones with no state related to them.
 2492                  * The tailq list is in LRU order.
 2493                  */
 2494                 dp = TAILQ_LAST(&clp->nfsc_deleg, nfscldeleghead);
 2495                 while (nfscl_delegcnt > nfscl_deleghighwater && dp != NULL) {
 2496                     ndp = TAILQ_PREV(dp, nfscldeleghead, nfsdl_list);
 2497                     if (dp->nfsdl_rwlock.nfslock_usecnt == 0 &&
 2498                         dp->nfsdl_rwlock.nfslock_lock == 0 &&
 2499                         dp->nfsdl_timestamp < NFSD_MONOSEC &&
 2500                         (dp->nfsdl_flags & (NFSCLDL_RECALL | NFSCLDL_ZAPPED |
 2501                           NFSCLDL_NEEDRECLAIM | NFSCLDL_DELEGRET)) == 0) {
 2502                         clearok = 1;
 2503                         LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
 2504                             op = LIST_FIRST(&owp->nfsow_open);
 2505                             if (op != NULL) {
 2506                                 clearok = 0;
 2507                                 break;
 2508                             }
 2509                         }
 2510                         if (clearok) {
 2511                             LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
 2512                                 if (!LIST_EMPTY(&lp->nfsl_lock)) {
 2513                                     clearok = 0;
 2514                                     break;
 2515                                 }
 2516                             }
 2517                         }
 2518                         if (clearok) {
 2519                             TAILQ_REMOVE(&clp->nfsc_deleg, dp, nfsdl_list);
 2520                             LIST_REMOVE(dp, nfsdl_hash);
 2521                             TAILQ_INSERT_HEAD(&dh, dp, nfsdl_list);
 2522                             nfscl_delegcnt--;
 2523                             newnfsstats.cldelegates--;
 2524                         }
 2525                     }
 2526                     dp = ndp;
 2527                 }
 2528                 if (igotlock)
 2529                         nfsv4_unlock(&clp->nfsc_lock, 0);
 2530                 NFSUNLOCKCLSTATE();
 2531 
 2532                 /*
 2533                  * Delegreturn any delegations cleaned out or recalled.
 2534                  */
 2535                 TAILQ_FOREACH_SAFE(dp, &dh, nfsdl_list, ndp) {
 2536                         newnfs_copycred(&dp->nfsdl_cred, cred);
 2537                         (void) nfscl_trydelegreturn(dp, cred, clp->nfsc_nmp, p);
 2538                         TAILQ_REMOVE(&dh, dp, nfsdl_list);
 2539                         FREE((caddr_t)dp, M_NFSCLDELEG);
 2540                 }
 2541 
 2542 #if defined(APPLEKEXT) || defined(__FreeBSD__)
 2543                 /*
 2544                  * Simulate the calls to nfscl_cleanup() when a process
 2545                  * exits, since the call can't be patched into exit().
 2546                  */
 2547                 {
 2548                         struct timespec mytime;
 2549                         static time_t prevsec = 0;
 2550 
 2551                         NFSGETNANOTIME(&mytime);
 2552                         if (prevsec != mytime.tv_sec) {
 2553                                 prevsec = mytime.tv_sec;
 2554                                 nfscl_cleanupkext(clp);
 2555                         }
 2556                 }
 2557 #endif  /* APPLEKEXT || __FreeBSD__ */
 2558 
 2559                 if ((clp->nfsc_flags & NFSCLFLAGS_RECOVER) == 0)
 2560                     (void) tsleep((caddr_t)clp, PWAIT, "nfscl", hz);
 2561                 if (clp->nfsc_flags & NFSCLFLAGS_UMOUNT) {
 2562                         NFSFREECRED(cred);
 2563                         clp->nfsc_flags &= ~NFSCLFLAGS_HASTHREAD;
 2564                         wakeup((caddr_t)clp);
 2565                         return;
 2566                 }
 2567         }
 2568 }
 2569 
 2570 /*
 2571  * Initiate state recovery. Called when NFSERR_STALECLIENTID or
 2572  * NFSERR_STALESTATEID is received.
 2573  */
 2574 APPLESTATIC void
 2575 nfscl_initiate_recovery(struct nfsclclient *clp)
 2576 {
 2577 
 2578         if (clp == NULL)
 2579                 return;
 2580         NFSLOCKCLSTATE();
 2581         clp->nfsc_flags |= NFSCLFLAGS_RECOVER;
 2582         NFSUNLOCKCLSTATE();
 2583         wakeup((caddr_t)clp);
 2584 }
 2585 
 2586 /*
 2587  * Dump out the state stuff for debugging.
 2588  */
 2589 APPLESTATIC void
 2590 nfscl_dumpstate(struct nfsmount *nmp, int openowner, int opens,
 2591     int lockowner, int locks)
 2592 {
 2593         struct nfsclclient *clp;
 2594         struct nfsclowner *owp;
 2595         struct nfsclopen *op;
 2596         struct nfscllockowner *lp;
 2597         struct nfscllock *lop;
 2598         struct nfscldeleg *dp;
 2599 
 2600         clp = nmp->nm_clp;
 2601         if (clp == NULL) {
 2602                 printf("nfscl dumpstate NULL clp\n");
 2603                 return;
 2604         }
 2605         NFSLOCKCLSTATE();
 2606         TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
 2607           LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
 2608             if (openowner && !LIST_EMPTY(&owp->nfsow_open))
 2609                 printf("owner=0x%x 0x%x 0x%x 0x%x seqid=%d\n",
 2610                     owp->nfsow_owner[0], owp->nfsow_owner[1],
 2611                     owp->nfsow_owner[2], owp->nfsow_owner[3],
 2612                     owp->nfsow_seqid);
 2613             LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 2614                 if (opens)
 2615                     printf("open st=0x%x 0x%x 0x%x cnt=%d fh12=0x%x\n",
 2616                         op->nfso_stateid.other[0], op->nfso_stateid.other[1],
 2617                         op->nfso_stateid.other[2], op->nfso_opencnt,
 2618                         op->nfso_fh[12]);
 2619                 LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
 2620                     if (lockowner)
 2621                         printf("lckown=0x%x 0x%x 0x%x 0x%x seqid=%d st=0x%x 0x%x 0x%x\n",
 2622                             lp->nfsl_owner[0], lp->nfsl_owner[1],
 2623                             lp->nfsl_owner[2], lp->nfsl_owner[3],
 2624                             lp->nfsl_seqid,
 2625                             lp->nfsl_stateid.other[0], lp->nfsl_stateid.other[1],
 2626                             lp->nfsl_stateid.other[2]);
 2627                     LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
 2628                         if (locks)
 2629 #ifdef __FreeBSD__
 2630                             printf("lck typ=%d fst=%ju end=%ju\n",
 2631                                 lop->nfslo_type, (intmax_t)lop->nfslo_first,
 2632                                 (intmax_t)lop->nfslo_end);
 2633 #else
 2634                             printf("lck typ=%d fst=%qd end=%qd\n",
 2635                                 lop->nfslo_type, lop->nfslo_first,
 2636                                 lop->nfslo_end);
 2637 #endif
 2638                     }
 2639                 }
 2640             }
 2641           }
 2642         }
 2643         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 2644             if (openowner && !LIST_EMPTY(&owp->nfsow_open))
 2645                 printf("owner=0x%x 0x%x 0x%x 0x%x seqid=%d\n",
 2646                     owp->nfsow_owner[0], owp->nfsow_owner[1],
 2647                     owp->nfsow_owner[2], owp->nfsow_owner[3],
 2648                     owp->nfsow_seqid);
 2649             LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 2650                 if (opens)
 2651                     printf("open st=0x%x 0x%x 0x%x cnt=%d fh12=0x%x\n",
 2652                         op->nfso_stateid.other[0], op->nfso_stateid.other[1],
 2653                         op->nfso_stateid.other[2], op->nfso_opencnt,
 2654                         op->nfso_fh[12]);
 2655                 LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
 2656                     if (lockowner)
 2657                         printf("lckown=0x%x 0x%x 0x%x 0x%x seqid=%d st=0x%x 0x%x 0x%x\n",
 2658                             lp->nfsl_owner[0], lp->nfsl_owner[1],
 2659                             lp->nfsl_owner[2], lp->nfsl_owner[3],
 2660                             lp->nfsl_seqid,
 2661                             lp->nfsl_stateid.other[0], lp->nfsl_stateid.other[1],
 2662                             lp->nfsl_stateid.other[2]);
 2663                     LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
 2664                         if (locks)
 2665 #ifdef __FreeBSD__
 2666                             printf("lck typ=%d fst=%ju end=%ju\n",
 2667                                 lop->nfslo_type, (intmax_t)lop->nfslo_first,
 2668                                 (intmax_t)lop->nfslo_end);
 2669 #else
 2670                             printf("lck typ=%d fst=%qd end=%qd\n",
 2671                                 lop->nfslo_type, lop->nfslo_first,
 2672                                 lop->nfslo_end);
 2673 #endif
 2674                     }
 2675                 }
 2676             }
 2677         }
 2678         NFSUNLOCKCLSTATE();
 2679 }
 2680 
 2681 /*
 2682  * Check for duplicate open owners and opens.
 2683  * (Only used as a diagnostic aid.)
 2684  */
 2685 APPLESTATIC void
 2686 nfscl_dupopen(vnode_t vp, int dupopens)
 2687 {
 2688         struct nfsclclient *clp;
 2689         struct nfsclowner *owp, *owp2;
 2690         struct nfsclopen *op, *op2;
 2691         struct nfsfh *nfhp;
 2692 
 2693         clp = VFSTONFS(vnode_mount(vp))->nm_clp;
 2694         if (clp == NULL) {
 2695                 printf("nfscl dupopen NULL clp\n");
 2696                 return;
 2697         }
 2698         nfhp = VTONFS(vp)->n_fhp;
 2699         NFSLOCKCLSTATE();
 2700 
 2701         /*
 2702          * First, search for duplicate owners.
 2703          * These should never happen!
 2704          */
 2705         LIST_FOREACH(owp2, &clp->nfsc_owner, nfsow_list) {
 2706             LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 2707                 if (owp != owp2 &&
 2708                     !NFSBCMP(owp->nfsow_owner, owp2->nfsow_owner,
 2709                     NFSV4CL_LOCKNAMELEN)) {
 2710                         NFSUNLOCKCLSTATE();
 2711                         printf("DUP OWNER\n");
 2712                         nfscl_dumpstate(VFSTONFS(vnode_mount(vp)), 1, 1, 0, 0);
 2713                         return;
 2714                 }
 2715             }
 2716         }
 2717 
 2718         /*
 2719          * Now, search for duplicate stateids.
 2720          * These shouldn't happen, either.
 2721          */
 2722         LIST_FOREACH(owp2, &clp->nfsc_owner, nfsow_list) {
 2723             LIST_FOREACH(op2, &owp2->nfsow_open, nfso_list) {
 2724                 LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 2725                     LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 2726                         if (op != op2 &&
 2727                             (op->nfso_stateid.other[0] != 0 ||
 2728                              op->nfso_stateid.other[1] != 0 ||
 2729                              op->nfso_stateid.other[2] != 0) &&
 2730                             op->nfso_stateid.other[0] == op2->nfso_stateid.other[0] &&
 2731                             op->nfso_stateid.other[1] == op2->nfso_stateid.other[1] &&
 2732                             op->nfso_stateid.other[2] == op2->nfso_stateid.other[2]) {
 2733                             NFSUNLOCKCLSTATE();
 2734                             printf("DUP STATEID\n");
 2735                             nfscl_dumpstate(VFSTONFS(vnode_mount(vp)), 1, 1, 0,
 2736                                 0);
 2737                             return;
 2738                         }
 2739                     }
 2740                 }
 2741             }
 2742         }
 2743 
 2744         /*
 2745          * Now search for duplicate opens.
 2746          * Duplicate opens for the same owner
 2747          * should never occur. Other duplicates are
 2748          * possible and are checked for if "dupopens"
 2749          * is true.
 2750          */
 2751         LIST_FOREACH(owp2, &clp->nfsc_owner, nfsow_list) {
 2752             LIST_FOREACH(op2, &owp2->nfsow_open, nfso_list) {
 2753                 if (nfhp->nfh_len == op2->nfso_fhlen &&
 2754                     !NFSBCMP(nfhp->nfh_fh, op2->nfso_fh, nfhp->nfh_len)) {
 2755                     LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 2756                         LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 2757                             if (op != op2 && nfhp->nfh_len == op->nfso_fhlen &&
 2758                                 !NFSBCMP(nfhp->nfh_fh, op->nfso_fh, nfhp->nfh_len) &&
 2759                                 (!NFSBCMP(op->nfso_own->nfsow_owner,
 2760                                  op2->nfso_own->nfsow_owner, NFSV4CL_LOCKNAMELEN) ||
 2761                                  dupopens)) {
 2762                                 if (!NFSBCMP(op->nfso_own->nfsow_owner,
 2763                                     op2->nfso_own->nfsow_owner, NFSV4CL_LOCKNAMELEN)) {
 2764                                     NFSUNLOCKCLSTATE();
 2765                                     printf("BADDUP OPEN\n");
 2766                                 } else {
 2767                                     NFSUNLOCKCLSTATE();
 2768                                     printf("DUP OPEN\n");
 2769                                 }
 2770                                 nfscl_dumpstate(VFSTONFS(vnode_mount(vp)), 1, 1,
 2771                                     0, 0);
 2772                                 return;
 2773                             }
 2774                         }
 2775                     }
 2776                 }
 2777             }
 2778         }
 2779         NFSUNLOCKCLSTATE();
 2780 }
 2781 
 2782 /*
 2783  * During close, find an open that needs to be dereferenced and
 2784  * dereference it. If there are no more opens for this file,
 2785  * log a message to that effect.
 2786  * Opens aren't actually Close'd until VOP_INACTIVE() is performed
 2787  * on the file's vnode.
 2788  * This is the safe way, since it is difficult to identify
 2789  * which open the close is for and I/O can be performed after the
 2790  * close(2) system call when a file is mmap'd.
 2791  * If it returns 0 for success, there will be a referenced
 2792  * clp returned via clpp.
 2793  */
 2794 APPLESTATIC int
 2795 nfscl_getclose(vnode_t vp, struct nfsclclient **clpp)
 2796 {
 2797         struct nfsclclient *clp;
 2798         struct nfsclowner *owp;
 2799         struct nfsclopen *op;
 2800         struct nfscldeleg *dp;
 2801         struct nfsfh *nfhp;
 2802         int error, notdecr;
 2803 
 2804         error = nfscl_getcl(vp, NULL, NULL, &clp);
 2805         if (error)
 2806                 return (error);
 2807         *clpp = clp;
 2808 
 2809         nfhp = VTONFS(vp)->n_fhp;
 2810         notdecr = 1;
 2811         NFSLOCKCLSTATE();
 2812         /*
 2813          * First, look for one under a delegation that was locally issued
 2814          * and just decrement the opencnt for it. Since all my Opens against
 2815          * the server are DENY_NONE, I don't see a problem with hanging
 2816          * onto them. (It is much easier to use one of the extant Opens
 2817          * that I already have on the server when a Delegation is recalled
 2818          * than to do fresh Opens.) Someday, I might need to rethink this, but.
 2819          */
 2820         dp = nfscl_finddeleg(clp, nfhp->nfh_fh, nfhp->nfh_len);
 2821         if (dp != NULL) {
 2822                 LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
 2823                         op = LIST_FIRST(&owp->nfsow_open);
 2824                         if (op != NULL) {
 2825                                 /*
 2826                                  * Since a delegation is for a file, there
 2827                                  * should never be more than one open for
 2828                                  * each openowner.
 2829                                  */
 2830                                 if (LIST_NEXT(op, nfso_list) != NULL)
 2831                                         panic("nfscdeleg opens");
 2832                                 if (notdecr && op->nfso_opencnt > 0) {
 2833                                         notdecr = 0;
 2834                                         op->nfso_opencnt--;
 2835                                         break;
 2836                                 }
 2837                         }
 2838                 }
 2839         }
 2840 
 2841         /* Now process the opens against the server. */
 2842         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 2843                 LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 2844                         if (op->nfso_fhlen == nfhp->nfh_len &&
 2845                             !NFSBCMP(op->nfso_fh, nfhp->nfh_fh,
 2846                             nfhp->nfh_len)) {
 2847                                 /* Found an open, decrement cnt if possible */
 2848                                 if (notdecr && op->nfso_opencnt > 0) {
 2849                                         notdecr = 0;
 2850                                         op->nfso_opencnt--;
 2851                                 }
 2852                                 /*
 2853                                  * There are more opens, so just return.
 2854                                  */
 2855                                 if (op->nfso_opencnt > 0) {
 2856                                         NFSUNLOCKCLSTATE();
 2857                                         return (0);
 2858                                 }
 2859                         }
 2860                 }
 2861         }
 2862         NFSUNLOCKCLSTATE();
 2863         if (notdecr)
 2864                 printf("nfscl: never fnd open\n");
 2865         return (0);
 2866 }
 2867 
 2868 APPLESTATIC int
 2869 nfscl_doclose(vnode_t vp, struct nfsclclient **clpp, NFSPROC_T *p)
 2870 {
 2871         struct nfsclclient *clp;
 2872         struct nfsclowner *owp, *nowp;
 2873         struct nfsclopen *op;
 2874         struct nfscldeleg *dp;
 2875         struct nfsfh *nfhp;
 2876         int error;
 2877 
 2878         error = nfscl_getcl(vp, NULL, NULL, &clp);
 2879         if (error)
 2880                 return (error);
 2881         *clpp = clp;
 2882 
 2883         nfhp = VTONFS(vp)->n_fhp;
 2884         NFSLOCKCLSTATE();
 2885         /*
 2886          * First get rid of the local Open structures, which should be no
 2887          * longer in use.
 2888          */
 2889         dp = nfscl_finddeleg(clp, nfhp->nfh_fh, nfhp->nfh_len);
 2890         if (dp != NULL) {
 2891                 LIST_FOREACH_SAFE(owp, &dp->nfsdl_owner, nfsow_list, nowp) {
 2892                         op = LIST_FIRST(&owp->nfsow_open);
 2893                         if (op != NULL) {
 2894                                 KASSERT((op->nfso_opencnt == 0),
 2895                                     ("nfscl: bad open cnt on deleg"));
 2896                                 nfscl_freeopen(op, 1);
 2897                         }
 2898                         nfscl_freeopenowner(owp, 1);
 2899                 }
 2900         }
 2901 
 2902         /* Now process the opens against the server. */
 2903 lookformore:
 2904         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 2905                 op = LIST_FIRST(&owp->nfsow_open);
 2906                 while (op != NULL) {
 2907                         if (op->nfso_fhlen == nfhp->nfh_len &&
 2908                             !NFSBCMP(op->nfso_fh, nfhp->nfh_fh,
 2909                             nfhp->nfh_len)) {
 2910                                 /* Found an open, close it. */
 2911                                 KASSERT((op->nfso_opencnt == 0),
 2912                                     ("nfscl: bad open cnt on server"));
 2913                                 NFSUNLOCKCLSTATE();
 2914                                 nfsrpc_doclose(VFSTONFS(vnode_mount(vp)), op,
 2915                                     p);
 2916                                 NFSLOCKCLSTATE();
 2917                                 goto lookformore;
 2918                         }
 2919                         op = LIST_NEXT(op, nfso_list);
 2920                 }
 2921         }
 2922         NFSUNLOCKCLSTATE();
 2923         return (0);
 2924 }
 2925 
 2926 /*
 2927  * Return all delegations on this client.
 2928  * (Must be called with client sleep lock.)
 2929  */
 2930 static void
 2931 nfscl_delegreturnall(struct nfsclclient *clp, NFSPROC_T *p)
 2932 {
 2933         struct nfscldeleg *dp, *ndp;
 2934         struct ucred *cred;
 2935 
 2936         cred = newnfs_getcred();
 2937         TAILQ_FOREACH_SAFE(dp, &clp->nfsc_deleg, nfsdl_list, ndp) {
 2938                 nfscl_cleandeleg(dp);
 2939                 (void) nfscl_trydelegreturn(dp, cred, clp->nfsc_nmp, p);
 2940                 nfscl_freedeleg(&clp->nfsc_deleg, dp);
 2941         }
 2942         NFSFREECRED(cred);
 2943 }
 2944 
 2945 /*
 2946  * Do a callback RPC.
 2947  */
 2948 APPLESTATIC void
 2949 nfscl_docb(struct nfsrv_descript *nd, NFSPROC_T *p)
 2950 {
 2951         int i, op;
 2952         u_int32_t *tl;
 2953         struct nfsclclient *clp;
 2954         struct nfscldeleg *dp = NULL;
 2955         int numops, taglen = -1, error = 0, trunc, ret = 0;
 2956         u_int32_t minorvers, retops = 0, *retopsp = NULL, *repp, cbident;
 2957         u_char tag[NFSV4_SMALLSTR + 1], *tagstr;
 2958         vnode_t vp = NULL;
 2959         struct nfsnode *np;
 2960         struct vattr va;
 2961         struct nfsfh *nfhp;
 2962         mount_t mp;
 2963         nfsattrbit_t attrbits, rattrbits;
 2964         nfsv4stateid_t stateid;
 2965 
 2966         nfsrvd_rephead(nd);
 2967         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2968         taglen = fxdr_unsigned(int, *tl);
 2969         if (taglen < 0) {
 2970                 error = EBADRPC;
 2971                 goto nfsmout;
 2972         }
 2973         if (taglen <= NFSV4_SMALLSTR)
 2974                 tagstr = tag;
 2975         else
 2976                 tagstr = malloc(taglen + 1, M_TEMP, M_WAITOK);
 2977         error = nfsrv_mtostr(nd, tagstr, taglen);
 2978         if (error) {
 2979                 if (taglen > NFSV4_SMALLSTR)
 2980                         free(tagstr, M_TEMP);
 2981                 taglen = -1;
 2982                 goto nfsmout;
 2983         }
 2984         (void) nfsm_strtom(nd, tag, taglen);
 2985         if (taglen > NFSV4_SMALLSTR) {
 2986                 free(tagstr, M_TEMP);
 2987         }
 2988         NFSM_BUILD(retopsp, u_int32_t *, NFSX_UNSIGNED);
 2989         NFSM_DISSECT(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
 2990         minorvers = fxdr_unsigned(u_int32_t, *tl++);
 2991         if (minorvers != NFSV4_MINORVERSION)
 2992                 nd->nd_repstat = NFSERR_MINORVERMISMATCH;
 2993         cbident = fxdr_unsigned(u_int32_t, *tl++);
 2994         if (nd->nd_repstat)
 2995                 numops = 0;
 2996         else
 2997                 numops = fxdr_unsigned(int, *tl);
 2998         /*
 2999          * Loop around doing the sub ops.
 3000          */
 3001         for (i = 0; i < numops; i++) {
 3002                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 3003                 NFSM_BUILD(repp, u_int32_t *, 2 * NFSX_UNSIGNED);
 3004                 *repp++ = *tl;
 3005                 op = fxdr_unsigned(int, *tl);
 3006                 if (op < NFSV4OP_CBGETATTR || op > NFSV4OP_CBRECALL) {
 3007                     nd->nd_repstat = NFSERR_OPILLEGAL;
 3008                     *repp = nfscl_errmap(nd);
 3009                     retops++;
 3010                     break;
 3011                 }
 3012                 nd->nd_procnum = op;
 3013                 newnfsstats.cbrpccnt[nd->nd_procnum]++;
 3014                 switch (op) {
 3015                 case NFSV4OP_CBGETATTR:
 3016                         clp = NULL;
 3017                         error = nfsm_getfh(nd, &nfhp);
 3018                         if (!error)
 3019                                 error = nfsrv_getattrbits(nd, &attrbits,
 3020                                     NULL, NULL);
 3021                         if (!error) {
 3022                                 mp = nfscl_getmnt(cbident);
 3023                                 if (mp == NULL)
 3024                                         error = NFSERR_SERVERFAULT;
 3025                         }
 3026                         if (!error) {
 3027                                 dp = NULL;
 3028                                 NFSLOCKCLSTATE();
 3029                                 clp = nfscl_findcl(VFSTONFS(mp));
 3030                                 if (clp != NULL)
 3031                                         dp = nfscl_finddeleg(clp, nfhp->nfh_fh,
 3032                                             nfhp->nfh_len);
 3033                                 NFSUNLOCKCLSTATE();
 3034                                 if (dp == NULL)
 3035                                         error = NFSERR_SERVERFAULT;
 3036                         }
 3037                         if (!error) {
 3038                                 ret = nfscl_ngetreopen(mp, nfhp->nfh_fh,
 3039                                     nfhp->nfh_len, p, &np);
 3040                                 if (!ret)
 3041                                         vp = NFSTOV(np);
 3042                         }
 3043                         if (nfhp != NULL)
 3044                                 FREE((caddr_t)nfhp, M_NFSFH);
 3045                         if (!error) {
 3046                                 NFSZERO_ATTRBIT(&rattrbits);
 3047                                 if (NFSISSET_ATTRBIT(&attrbits,
 3048                                     NFSATTRBIT_SIZE)) {
 3049                                         if (!ret)
 3050                                                 va.va_size = np->n_size;
 3051                                         else
 3052                                                 va.va_size = dp->nfsdl_size;
 3053                                         NFSSETBIT_ATTRBIT(&rattrbits,
 3054                                             NFSATTRBIT_SIZE);
 3055                                 }
 3056                                 if (NFSISSET_ATTRBIT(&attrbits,
 3057                                     NFSATTRBIT_CHANGE)) {
 3058                                         va.va_filerev = dp->nfsdl_change;
 3059                                         if (ret || (np->n_flag & NDELEGMOD))
 3060                                                 va.va_filerev++;
 3061                                         NFSSETBIT_ATTRBIT(&rattrbits,
 3062                                             NFSATTRBIT_CHANGE);
 3063                                 }
 3064                                 (void) nfsv4_fillattr(nd, NULL, NULL, &va,
 3065                                     NULL, 0, &rattrbits, NULL, NULL, 0, 0);
 3066                                 if (!ret)
 3067                                         vrele(vp);
 3068                         }
 3069                         break;
 3070                 case NFSV4OP_CBRECALL:
 3071                         clp = NULL;
 3072                         NFSM_DISSECT(tl, u_int32_t *, NFSX_STATEID +
 3073                             NFSX_UNSIGNED);
 3074                         stateid.seqid = *tl++;
 3075                         NFSBCOPY((caddr_t)tl, (caddr_t)stateid.other,
 3076                             NFSX_STATEIDOTHER);
 3077                         tl += (NFSX_STATEIDOTHER / NFSX_UNSIGNED);
 3078                         trunc = fxdr_unsigned(int, *tl);
 3079                         error = nfsm_getfh(nd, &nfhp);
 3080                         if (!error) {
 3081                                 mp = nfscl_getmnt(cbident);
 3082                                 if (mp == NULL)
 3083                                         error = NFSERR_SERVERFAULT;
 3084                         }
 3085                         if (!error) {
 3086                                 NFSLOCKCLSTATE();
 3087                                 clp = nfscl_findcl(VFSTONFS(mp));
 3088                                 if (clp != NULL) {
 3089                                         dp = nfscl_finddeleg(clp, nfhp->nfh_fh,
 3090                                             nfhp->nfh_len);
 3091                                         if (dp != NULL && (dp->nfsdl_flags &
 3092                                             NFSCLDL_DELEGRET) == 0) {
 3093                                                 dp->nfsdl_flags |=
 3094                                                     NFSCLDL_RECALL;
 3095                                                 wakeup((caddr_t)clp);
 3096                                         }
 3097                                 } else {
 3098                                         error = NFSERR_SERVERFAULT;
 3099                                 }
 3100                                 NFSUNLOCKCLSTATE();
 3101                         }
 3102                         if (nfhp != NULL)
 3103                                 FREE((caddr_t)nfhp, M_NFSFH);
 3104                         break;
 3105                 };
 3106                 if (error) {
 3107                         if (error == EBADRPC || error == NFSERR_BADXDR) {
 3108                                 nd->nd_repstat = NFSERR_BADXDR;
 3109                         } else {
 3110                                 nd->nd_repstat = error;
 3111                         }
 3112                         error = 0;
 3113                 }
 3114                 retops++;
 3115                 if (nd->nd_repstat) {
 3116                         *repp = nfscl_errmap(nd);
 3117                         break;
 3118                 } else
 3119                         *repp = 0;      /* NFS4_OK */
 3120         }
 3121 nfsmout:
 3122         if (error) {
 3123                 if (error == EBADRPC || error == NFSERR_BADXDR)
 3124                         nd->nd_repstat = NFSERR_BADXDR;
 3125                 else
 3126                         printf("nfsv4 comperr1=%d\n", error);
 3127         }
 3128         if (taglen == -1) {
 3129                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 3130                 *tl++ = 0;
 3131                 *tl = 0;
 3132         } else {
 3133                 *retopsp = txdr_unsigned(retops);
 3134         }
 3135         *nd->nd_errp = nfscl_errmap(nd);
 3136 }
 3137 
 3138 /*
 3139  * Generate the next cbident value. Basically just increment a static value
 3140  * and then check that it isn't already in the list, if it has wrapped around.
 3141  */
 3142 static u_int32_t
 3143 nfscl_nextcbident(void)
 3144 {
 3145         struct nfsclclient *clp;
 3146         int matched;
 3147         static u_int32_t nextcbident = 0;
 3148         static int haswrapped = 0;
 3149 
 3150         nextcbident++;
 3151         if (nextcbident == 0)
 3152                 haswrapped = 1;
 3153         if (haswrapped) {
 3154                 /*
 3155                  * Search the clientid list for one already using this cbident.
 3156                  */
 3157                 do {
 3158                         matched = 0;
 3159                         NFSLOCKCLSTATE();
 3160                         LIST_FOREACH(clp, &nfsclhead, nfsc_list) {
 3161                                 if (clp->nfsc_cbident == nextcbident) {
 3162                                         matched = 1;
 3163                                         break;
 3164                                 }
 3165                         }
 3166                         NFSUNLOCKCLSTATE();
 3167                         if (matched == 1)
 3168                                 nextcbident++;
 3169                 } while (matched);
 3170         }
 3171         return (nextcbident);
 3172 }
 3173 
 3174 /*
 3175  * Get the mount point related to a given cbident.
 3176  */
 3177 static mount_t
 3178 nfscl_getmnt(u_int32_t cbident)
 3179 {
 3180         struct nfsclclient *clp;
 3181         struct nfsmount *nmp;
 3182 
 3183         NFSLOCKCLSTATE();
 3184         LIST_FOREACH(clp, &nfsclhead, nfsc_list) {
 3185                 if (clp->nfsc_cbident == cbident)
 3186                         break;
 3187         }
 3188         if (clp == NULL) {
 3189                 NFSUNLOCKCLSTATE();
 3190                 return (NULL);
 3191         }
 3192         nmp = clp->nfsc_nmp;
 3193         NFSUNLOCKCLSTATE();
 3194         return (nmp->nm_mountp);
 3195 }
 3196 
 3197 /*
 3198  * Search for a lock conflict locally on the client. A conflict occurs if
 3199  * - not same owner and overlapping byte range and at least one of them is
 3200  *   a write lock or this is an unlock.
 3201  */
 3202 static int
 3203 nfscl_localconflict(struct nfsclclient *clp, u_int8_t *fhp, int fhlen,
 3204     struct nfscllock *nlop, u_int8_t *own, struct nfscldeleg *dp,
 3205     struct nfscllock **lopp)
 3206 {
 3207         struct nfsclowner *owp;
 3208         struct nfsclopen *op;
 3209         int ret;
 3210 
 3211         if (dp != NULL) {
 3212                 ret = nfscl_checkconflict(&dp->nfsdl_lock, nlop, own, lopp);
 3213                 if (ret)
 3214                         return (ret);
 3215         }
 3216         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 3217                 LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 3218                         if (op->nfso_fhlen == fhlen &&
 3219                             !NFSBCMP(op->nfso_fh, fhp, fhlen)) {
 3220                                 ret = nfscl_checkconflict(&op->nfso_lock, nlop,
 3221                                     own, lopp);
 3222                                 if (ret)
 3223                                         return (ret);
 3224                         }
 3225                 }
 3226         }
 3227         return (0);
 3228 }
 3229 
 3230 static int
 3231 nfscl_checkconflict(struct nfscllockownerhead *lhp, struct nfscllock *nlop,
 3232     u_int8_t *own, struct nfscllock **lopp)
 3233 {
 3234         struct nfscllockowner *lp;
 3235         struct nfscllock *lop;
 3236 
 3237         LIST_FOREACH(lp, lhp, nfsl_list) {
 3238                 if (NFSBCMP(lp->nfsl_owner, own, NFSV4CL_LOCKNAMELEN)) {
 3239                         LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
 3240                                 if (lop->nfslo_first >= nlop->nfslo_end)
 3241                                         break;
 3242                                 if (lop->nfslo_end <= nlop->nfslo_first)
 3243                                         continue;
 3244                                 if (lop->nfslo_type == F_WRLCK ||
 3245                                     nlop->nfslo_type == F_WRLCK ||
 3246                                     nlop->nfslo_type == F_UNLCK) {
 3247                                         if (lopp != NULL)
 3248                                                 *lopp = lop;
 3249                                         return (NFSERR_DENIED);
 3250                                 }
 3251                         }
 3252                 }
 3253         }
 3254         return (0);
 3255 }
 3256 
 3257 /*
 3258  * Check for a local conflicting lock.
 3259  */
 3260 APPLESTATIC int
 3261 nfscl_lockt(vnode_t vp, struct nfsclclient *clp, u_int64_t off,
 3262     u_int64_t len, struct flock *fl, NFSPROC_T *p)
 3263 {
 3264         struct nfscllock *lop, nlck;
 3265         struct nfscldeleg *dp;
 3266         struct nfsnode *np;
 3267         u_int8_t own[NFSV4CL_LOCKNAMELEN];
 3268         int error;
 3269 
 3270         nlck.nfslo_type = fl->l_type;
 3271         nlck.nfslo_first = off;
 3272         if (len == NFS64BITSSET) {
 3273                 nlck.nfslo_end = NFS64BITSSET;
 3274         } else {
 3275                 nlck.nfslo_end = off + len;
 3276                 if (nlck.nfslo_end <= nlck.nfslo_first)
 3277                         return (NFSERR_INVAL);
 3278         }
 3279         np = VTONFS(vp);
 3280         nfscl_filllockowner(p, own);
 3281         NFSLOCKCLSTATE();
 3282         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 3283         error = nfscl_localconflict(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len,
 3284             &nlck, own, dp, &lop);
 3285         if (error != 0) {
 3286                 fl->l_whence = SEEK_SET;
 3287                 fl->l_start = lop->nfslo_first;
 3288                 if (lop->nfslo_end == NFS64BITSSET)
 3289                         fl->l_len = 0;
 3290                 else
 3291                         fl->l_len = lop->nfslo_end - lop->nfslo_first;
 3292                 fl->l_pid = (pid_t)0;
 3293                 fl->l_type = lop->nfslo_type;
 3294                 error = -1;                     /* no RPC required */
 3295         } else if (dp != NULL && ((dp->nfsdl_flags & NFSCLDL_WRITE) ||
 3296             fl->l_type == F_RDLCK)) {
 3297                 /*
 3298                  * The delegation ensures that there isn't a conflicting
 3299                  * lock on the server, so return -1 to indicate an RPC
 3300                  * isn't required.
 3301                  */
 3302                 fl->l_type = F_UNLCK;
 3303                 error = -1;
 3304         }
 3305         NFSUNLOCKCLSTATE();
 3306         return (error);
 3307 }
 3308 
 3309 /*
 3310  * Handle Recall of a delegation.
 3311  * The clp must be exclusive locked when this is called.
 3312  */
 3313 static int
 3314 nfscl_recalldeleg(struct nfsclclient *clp, struct nfsmount *nmp,
 3315     struct nfscldeleg *dp, vnode_t vp, struct ucred *cred, NFSPROC_T *p,
 3316     int called_from_renewthread)
 3317 {
 3318         struct nfsclowner *owp, *lowp, *nowp;
 3319         struct nfsclopen *op, *lop;
 3320         struct nfscllockowner *lp;
 3321         struct nfscllock *lckp;
 3322         struct nfsnode *np;
 3323         int error = 0, ret, gotvp = 0;
 3324 
 3325         if (vp == NULL) {
 3326                 /*
 3327                  * First, get a vnode for the file. This is needed to do RPCs.
 3328                  */
 3329                 ret = nfscl_ngetreopen(nmp->nm_mountp, dp->nfsdl_fh,
 3330                     dp->nfsdl_fhlen, p, &np);
 3331                 if (ret) {
 3332                         /*
 3333                          * File isn't open, so nothing to move over to the
 3334                          * server.
 3335                          */
 3336                         return (0);
 3337                 }
 3338                 vp = NFSTOV(np);
 3339                 gotvp = 1;
 3340         } else {
 3341                 np = VTONFS(vp);
 3342         }
 3343         dp->nfsdl_flags &= ~NFSCLDL_MODTIMESET;
 3344 
 3345         /*
 3346          * Ok, if it's a write delegation, flush data to the server, so
 3347          * that close/open consistency is retained.
 3348          */
 3349         ret = 0;
 3350         NFSLOCKNODE(np);
 3351         if ((dp->nfsdl_flags & NFSCLDL_WRITE) && (np->n_flag & NMODIFIED)) {
 3352                 np->n_flag |= NDELEGRECALL;
 3353                 NFSUNLOCKNODE(np);
 3354                 ret = ncl_flush(vp, MNT_WAIT, cred, p, 1,
 3355                     called_from_renewthread);
 3356                 NFSLOCKNODE(np);
 3357                 np->n_flag &= ~NDELEGRECALL;
 3358         }
 3359         NFSINVALATTRCACHE(np);
 3360         NFSUNLOCKNODE(np);
 3361         if (ret == EIO && called_from_renewthread != 0) {
 3362                 /*
 3363                  * If the flush failed with EIO for the renew thread,
 3364                  * return now, so that the dirty buffer will be flushed
 3365                  * later.
 3366                  */
 3367                 if (gotvp != 0)
 3368                         vrele(vp);
 3369                 return (ret);
 3370         }
 3371 
 3372         /*
 3373          * Now, for each openowner with opens issued locally, move them
 3374          * over to state against the server.
 3375          */
 3376         LIST_FOREACH(lowp, &dp->nfsdl_owner, nfsow_list) {
 3377                 lop = LIST_FIRST(&lowp->nfsow_open);
 3378                 if (lop != NULL) {
 3379                         if (LIST_NEXT(lop, nfso_list) != NULL)
 3380                                 panic("nfsdlg mult opens");
 3381                         /*
 3382                          * Look for the same openowner against the server.
 3383                          */
 3384                         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 3385                                 if (!NFSBCMP(lowp->nfsow_owner,
 3386                                     owp->nfsow_owner, NFSV4CL_LOCKNAMELEN)) {
 3387                                         newnfs_copycred(&dp->nfsdl_cred, cred);
 3388                                         ret = nfscl_moveopen(vp, clp, nmp, lop,
 3389                                             owp, dp, cred, p);
 3390                                         if (ret == NFSERR_STALECLIENTID ||
 3391                                             ret == NFSERR_STALEDONTRECOVER) {
 3392                                                 if (gotvp)
 3393                                                         vrele(vp);
 3394                                                 return (ret);
 3395                                         }
 3396                                         if (ret) {
 3397                                                 nfscl_freeopen(lop, 1);
 3398                                                 if (!error)
 3399                                                         error = ret;
 3400                                         }
 3401                                         break;
 3402                                 }
 3403                         }
 3404 
 3405                         /*
 3406                          * If no openowner found, create one and get an open
 3407                          * for it.
 3408                          */
 3409                         if (owp == NULL) {
 3410                                 MALLOC(nowp, struct nfsclowner *,
 3411                                     sizeof (struct nfsclowner), M_NFSCLOWNER,
 3412                                     M_WAITOK);
 3413                                 nfscl_newopen(clp, NULL, &owp, &nowp, &op, 
 3414                                     NULL, lowp->nfsow_owner, dp->nfsdl_fh,
 3415                                     dp->nfsdl_fhlen, NULL);
 3416                                 newnfs_copycred(&dp->nfsdl_cred, cred);
 3417                                 ret = nfscl_moveopen(vp, clp, nmp, lop,
 3418                                     owp, dp, cred, p);
 3419                                 if (ret) {
 3420                                         nfscl_freeopenowner(owp, 0);
 3421                                         if (ret == NFSERR_STALECLIENTID ||
 3422                                             ret == NFSERR_STALEDONTRECOVER) {
 3423                                                 if (gotvp)
 3424                                                         vrele(vp);
 3425                                                 return (ret);
 3426                                         }
 3427                                         if (ret) {
 3428                                                 nfscl_freeopen(lop, 1);
 3429                                                 if (!error)
 3430                                                         error = ret;
 3431                                         }
 3432                                 }
 3433                         }
 3434                 }
 3435         }
 3436 
 3437         /*
 3438          * Now, get byte range locks for any locks done locally.
 3439          */
 3440         LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
 3441                 LIST_FOREACH(lckp, &lp->nfsl_lock, nfslo_list) {
 3442                         newnfs_copycred(&dp->nfsdl_cred, cred);
 3443                         ret = nfscl_relock(vp, clp, nmp, lp, lckp, cred, p);
 3444                         if (ret == NFSERR_STALESTATEID ||
 3445                             ret == NFSERR_STALEDONTRECOVER ||
 3446                             ret == NFSERR_STALECLIENTID) {
 3447                                 if (gotvp)
 3448                                         vrele(vp);
 3449                                 return (ret);
 3450                         }
 3451                         if (ret && !error)
 3452                                 error = ret;
 3453                 }
 3454         }
 3455         if (gotvp)
 3456                 vrele(vp);
 3457         return (error);
 3458 }
 3459 
 3460 /*
 3461  * Move a locally issued open over to an owner on the state list.
 3462  * SIDE EFFECT: If it needs to sleep (do an rpc), it unlocks clstate and
 3463  * returns with it unlocked.
 3464  */
 3465 static int
 3466 nfscl_moveopen(vnode_t vp, struct nfsclclient *clp, struct nfsmount *nmp,
 3467     struct nfsclopen *lop, struct nfsclowner *owp, struct nfscldeleg *dp,
 3468     struct ucred *cred, NFSPROC_T *p)
 3469 {
 3470         struct nfsclopen *op, *nop;
 3471         struct nfscldeleg *ndp;
 3472         struct nfsnode *np;
 3473         int error = 0, newone;
 3474 
 3475         /*
 3476          * First, look for an appropriate open, If found, just increment the
 3477          * opencnt in it.
 3478          */
 3479         LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 3480                 if ((op->nfso_mode & lop->nfso_mode) == lop->nfso_mode &&
 3481                     op->nfso_fhlen == lop->nfso_fhlen &&
 3482                     !NFSBCMP(op->nfso_fh, lop->nfso_fh, op->nfso_fhlen)) {
 3483                         op->nfso_opencnt += lop->nfso_opencnt;
 3484                         nfscl_freeopen(lop, 1);
 3485                         return (0);
 3486                 }
 3487         }
 3488 
 3489         /* No appropriate open, so we have to do one against the server. */
 3490         np = VTONFS(vp);
 3491         MALLOC(nop, struct nfsclopen *, sizeof (struct nfsclopen) +
 3492             lop->nfso_fhlen - 1, M_NFSCLOPEN, M_WAITOK);
 3493         newone = 0;
 3494         nfscl_newopen(clp, NULL, &owp, NULL, &op, &nop, owp->nfsow_owner,
 3495             lop->nfso_fh, lop->nfso_fhlen, &newone);
 3496         ndp = dp;
 3497         error = nfscl_tryopen(nmp, vp, np->n_v4->n4_data, np->n_v4->n4_fhlen,
 3498             lop->nfso_fh, lop->nfso_fhlen, lop->nfso_mode, op,
 3499             NFS4NODENAME(np->n_v4), np->n_v4->n4_namelen, &ndp, 0, 0, cred, p);
 3500         if (error) {
 3501                 if (newone)
 3502                         nfscl_freeopen(op, 0);
 3503         } else {
 3504                 if (newone)
 3505                         newnfs_copyincred(cred, &op->nfso_cred);
 3506                 op->nfso_mode |= lop->nfso_mode;
 3507                 op->nfso_opencnt += lop->nfso_opencnt;
 3508                 nfscl_freeopen(lop, 1);
 3509         }
 3510         if (nop != NULL)
 3511                 FREE((caddr_t)nop, M_NFSCLOPEN);
 3512         if (ndp != NULL) {
 3513                 /*
 3514                  * What should I do with the returned delegation, since the
 3515                  * delegation is being recalled? For now, just printf and
 3516                  * through it away.
 3517                  */
 3518                 printf("Moveopen returned deleg\n");
 3519                 FREE((caddr_t)ndp, M_NFSCLDELEG);
 3520         }
 3521         return (error);
 3522 }
 3523 
 3524 /*
 3525  * Recall all delegations on this client.
 3526  */
 3527 static void
 3528 nfscl_totalrecall(struct nfsclclient *clp)
 3529 {
 3530         struct nfscldeleg *dp;
 3531 
 3532         TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
 3533                 if ((dp->nfsdl_flags & NFSCLDL_DELEGRET) == 0)
 3534                         dp->nfsdl_flags |= NFSCLDL_RECALL;
 3535         }
 3536 }
 3537 
 3538 /*
 3539  * Relock byte ranges. Called for delegation recall and state expiry.
 3540  */
 3541 static int
 3542 nfscl_relock(vnode_t vp, struct nfsclclient *clp, struct nfsmount *nmp,
 3543     struct nfscllockowner *lp, struct nfscllock *lop, struct ucred *cred,
 3544     NFSPROC_T *p)
 3545 {
 3546         struct nfscllockowner *nlp;
 3547         struct nfsfh *nfhp;
 3548         u_int64_t off, len;
 3549         u_int32_t clidrev = 0;
 3550         int error, newone, donelocally;
 3551 
 3552         off = lop->nfslo_first;
 3553         len = lop->nfslo_end - lop->nfslo_first;
 3554         error = nfscl_getbytelock(vp, off, len, lop->nfslo_type, cred, p,
 3555             clp, 1, lp->nfsl_owner, lp->nfsl_openowner, &nlp, &newone,
 3556             &donelocally);
 3557         if (error || donelocally)
 3558                 return (error);
 3559         if (nmp->nm_clp != NULL)
 3560                 clidrev = nmp->nm_clp->nfsc_clientidrev;
 3561         else
 3562                 clidrev = 0;
 3563         nfhp = VTONFS(vp)->n_fhp;
 3564         error = nfscl_trylock(nmp, vp, nfhp->nfh_fh,
 3565             nfhp->nfh_len, nlp, newone, 0, off,
 3566             len, lop->nfslo_type, cred, p);
 3567         if (error)
 3568                 nfscl_freelockowner(nlp, 0);
 3569         return (error);
 3570 }
 3571 
 3572 /*
 3573  * Called to re-open a file. Basically get a vnode for the file handle
 3574  * and then call nfsrpc_openrpc() to do the rest.
 3575  */
 3576 static int
 3577 nfsrpc_reopen(struct nfsmount *nmp, u_int8_t *fhp, int fhlen,
 3578     u_int32_t mode, struct nfsclopen *op, struct nfscldeleg **dpp,
 3579     struct ucred *cred, NFSPROC_T *p)
 3580 {
 3581         struct nfsnode *np;
 3582         vnode_t vp;
 3583         int error;
 3584 
 3585         error = nfscl_ngetreopen(nmp->nm_mountp, fhp, fhlen, p, &np);
 3586         if (error)
 3587                 return (error);
 3588         vp = NFSTOV(np);
 3589         if (np->n_v4 != NULL) {
 3590                 error = nfscl_tryopen(nmp, vp, np->n_v4->n4_data,
 3591                     np->n_v4->n4_fhlen, fhp, fhlen, mode, op,
 3592                     NFS4NODENAME(np->n_v4), np->n_v4->n4_namelen, dpp, 0, 0,
 3593                     cred, p);
 3594         } else {
 3595                 error = EINVAL;
 3596         }
 3597         vrele(vp);
 3598         return (error);
 3599 }
 3600 
 3601 /*
 3602  * Try an open against the server. Just call nfsrpc_openrpc(), retrying while
 3603  * NFSERR_DELAY. Also, try system credentials, if the passed in credentials
 3604  * fail.
 3605  */
 3606 static int
 3607 nfscl_tryopen(struct nfsmount *nmp, vnode_t vp, u_int8_t *fhp, int fhlen,
 3608     u_int8_t *newfhp, int newfhlen, u_int32_t mode, struct nfsclopen *op,
 3609     u_int8_t *name, int namelen, struct nfscldeleg **ndpp,
 3610     int reclaim, u_int32_t delegtype, struct ucred *cred, NFSPROC_T *p)
 3611 {
 3612         int error;
 3613 
 3614         do {
 3615                 error = nfsrpc_openrpc(nmp, vp, fhp, fhlen, newfhp, newfhlen,
 3616                     mode, op, name, namelen, ndpp, reclaim, delegtype, cred, p,
 3617                     0, 0);
 3618                 if (error == NFSERR_DELAY)
 3619                         (void) nfs_catnap(PZERO, error, "nfstryop");
 3620         } while (error == NFSERR_DELAY);
 3621         if (error == EAUTH || error == EACCES) {
 3622                 /* Try again using system credentials */
 3623                 newnfs_setroot(cred);
 3624                 do {
 3625                     error = nfsrpc_openrpc(nmp, vp, fhp, fhlen, newfhp,
 3626                         newfhlen, mode, op, name, namelen, ndpp, reclaim,
 3627                         delegtype, cred, p, 1, 0);
 3628                     if (error == NFSERR_DELAY)
 3629                         (void) nfs_catnap(PZERO, error, "nfstryop");
 3630                 } while (error == NFSERR_DELAY);
 3631         }
 3632         return (error);
 3633 }
 3634 
 3635 /*
 3636  * Try a byte range lock. Just loop on nfsrpc_lock() while it returns
 3637  * NFSERR_DELAY. Also, retry with system credentials, if the provided
 3638  * cred don't work.
 3639  */
 3640 static int
 3641 nfscl_trylock(struct nfsmount *nmp, vnode_t vp, u_int8_t *fhp,
 3642     int fhlen, struct nfscllockowner *nlp, int newone, int reclaim,
 3643     u_int64_t off, u_int64_t len, short type, struct ucred *cred, NFSPROC_T *p)
 3644 {
 3645         struct nfsrv_descript nfsd, *nd = &nfsd;
 3646         int error;
 3647 
 3648         do {
 3649                 error = nfsrpc_lock(nd, nmp, vp, fhp, fhlen, nlp, newone,
 3650                     reclaim, off, len, type, cred, p, 0);
 3651                 if (!error && nd->nd_repstat == NFSERR_DELAY)
 3652                         (void) nfs_catnap(PZERO, (int)nd->nd_repstat,
 3653                             "nfstrylck");
 3654         } while (!error && nd->nd_repstat == NFSERR_DELAY);
 3655         if (!error)
 3656                 error = nd->nd_repstat;
 3657         if (error == EAUTH || error == EACCES) {
 3658                 /* Try again using root credentials */
 3659                 newnfs_setroot(cred);
 3660                 do {
 3661                         error = nfsrpc_lock(nd, nmp, vp, fhp, fhlen, nlp,
 3662                             newone, reclaim, off, len, type, cred, p, 1);
 3663                         if (!error && nd->nd_repstat == NFSERR_DELAY)
 3664                                 (void) nfs_catnap(PZERO, (int)nd->nd_repstat,
 3665                                     "nfstrylck");
 3666                 } while (!error && nd->nd_repstat == NFSERR_DELAY);
 3667                 if (!error)
 3668                         error = nd->nd_repstat;
 3669         }
 3670         return (error);
 3671 }
 3672 
 3673 /*
 3674  * Try a delegreturn against the server. Just call nfsrpc_delegreturn(),
 3675  * retrying while NFSERR_DELAY. Also, try system credentials, if the passed in
 3676  * credentials fail.
 3677  */
 3678 static int
 3679 nfscl_trydelegreturn(struct nfscldeleg *dp, struct ucred *cred,
 3680     struct nfsmount *nmp, NFSPROC_T *p)
 3681 {
 3682         int error;
 3683 
 3684         do {
 3685                 error = nfsrpc_delegreturn(dp, cred, nmp, p, 0);
 3686                 if (error == NFSERR_DELAY)
 3687                         (void) nfs_catnap(PZERO, error, "nfstrydp");
 3688         } while (error == NFSERR_DELAY);
 3689         if (error == EAUTH || error == EACCES) {
 3690                 /* Try again using system credentials */
 3691                 newnfs_setroot(cred);
 3692                 do {
 3693                         error = nfsrpc_delegreturn(dp, cred, nmp, p, 1);
 3694                         if (error == NFSERR_DELAY)
 3695                                 (void) nfs_catnap(PZERO, error, "nfstrydp");
 3696                 } while (error == NFSERR_DELAY);
 3697         }
 3698         return (error);
 3699 }
 3700 
 3701 /*
 3702  * Try a close against the server. Just call nfsrpc_closerpc(),
 3703  * retrying while NFSERR_DELAY. Also, try system credentials, if the passed in
 3704  * credentials fail.
 3705  */
 3706 APPLESTATIC int
 3707 nfscl_tryclose(struct nfsclopen *op, struct ucred *cred,
 3708     struct nfsmount *nmp, NFSPROC_T *p)
 3709 {
 3710         struct nfsrv_descript nfsd, *nd = &nfsd;
 3711         int error;
 3712 
 3713         do {
 3714                 error = nfsrpc_closerpc(nd, nmp, op, cred, p, 0);
 3715                 if (error == NFSERR_DELAY)
 3716                         (void) nfs_catnap(PZERO, error, "nfstrycl");
 3717         } while (error == NFSERR_DELAY);
 3718         if (error == EAUTH || error == EACCES) {
 3719                 /* Try again using system credentials */
 3720                 newnfs_setroot(cred);
 3721                 do {
 3722                         error = nfsrpc_closerpc(nd, nmp, op, cred, p, 1);
 3723                         if (error == NFSERR_DELAY)
 3724                                 (void) nfs_catnap(PZERO, error, "nfstrycl");
 3725                 } while (error == NFSERR_DELAY);
 3726         }
 3727         return (error);
 3728 }
 3729 
 3730 /*
 3731  * Decide if a delegation on a file permits close without flushing writes
 3732  * to the server. This might be a big performance win in some environments.
 3733  * (Not useful until the client does caching on local stable storage.)
 3734  */
 3735 APPLESTATIC int
 3736 nfscl_mustflush(vnode_t vp)
 3737 {
 3738         struct nfsclclient *clp;
 3739         struct nfscldeleg *dp;
 3740         struct nfsnode *np;
 3741         struct nfsmount *nmp;
 3742 
 3743         np = VTONFS(vp);
 3744         nmp = VFSTONFS(vnode_mount(vp));
 3745         if (!NFSHASNFSV4(nmp))
 3746                 return (1);
 3747         NFSLOCKCLSTATE();
 3748         clp = nfscl_findcl(nmp);
 3749         if (clp == NULL) {
 3750                 NFSUNLOCKCLSTATE();
 3751                 return (1);
 3752         }
 3753         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 3754         if (dp != NULL && (dp->nfsdl_flags &
 3755             (NFSCLDL_WRITE | NFSCLDL_RECALL | NFSCLDL_DELEGRET)) ==
 3756              NFSCLDL_WRITE &&
 3757             (dp->nfsdl_sizelimit >= np->n_size ||
 3758              !NFSHASSTRICT3530(nmp))) {
 3759                 NFSUNLOCKCLSTATE();
 3760                 return (0);
 3761         }
 3762         NFSUNLOCKCLSTATE();
 3763         return (1);
 3764 }
 3765 
 3766 /*
 3767  * See if a (write) delegation exists for this file.
 3768  */
 3769 APPLESTATIC int
 3770 nfscl_nodeleg(vnode_t vp, int writedeleg)
 3771 {
 3772         struct nfsclclient *clp;
 3773         struct nfscldeleg *dp;
 3774         struct nfsnode *np;
 3775         struct nfsmount *nmp;
 3776 
 3777         np = VTONFS(vp);
 3778         nmp = VFSTONFS(vnode_mount(vp));
 3779         if (!NFSHASNFSV4(nmp))
 3780                 return (1);
 3781         NFSLOCKCLSTATE();
 3782         clp = nfscl_findcl(nmp);
 3783         if (clp == NULL) {
 3784                 NFSUNLOCKCLSTATE();
 3785                 return (1);
 3786         }
 3787         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 3788         if (dp != NULL &&
 3789             (dp->nfsdl_flags & (NFSCLDL_RECALL | NFSCLDL_DELEGRET)) == 0 &&
 3790             (writedeleg == 0 || (dp->nfsdl_flags & NFSCLDL_WRITE) ==
 3791              NFSCLDL_WRITE)) {
 3792                 NFSUNLOCKCLSTATE();
 3793                 return (0);
 3794         }
 3795         NFSUNLOCKCLSTATE();
 3796         return (1);
 3797 }
 3798 
 3799 /*
 3800  * Look for an associated delegation that should be DelegReturned.
 3801  */
 3802 APPLESTATIC int
 3803 nfscl_removedeleg(vnode_t vp, NFSPROC_T *p, nfsv4stateid_t *stp)
 3804 {
 3805         struct nfsclclient *clp;
 3806         struct nfscldeleg *dp;
 3807         struct nfsclowner *owp;
 3808         struct nfscllockowner *lp;
 3809         struct nfsmount *nmp;
 3810         struct ucred *cred;
 3811         struct nfsnode *np;
 3812         int igotlock = 0, triedrecall = 0, needsrecall, retcnt = 0, islept;
 3813 
 3814         nmp = VFSTONFS(vnode_mount(vp));
 3815         np = VTONFS(vp);
 3816         NFSLOCKCLSTATE();
 3817         /*
 3818          * Loop around waiting for:
 3819          * - outstanding I/O operations on delegations to complete
 3820          * - for a delegation on vp that has state, lock the client and
 3821          *   do a recall
 3822          * - return delegation with no state
 3823          */
 3824         while (1) {
 3825                 clp = nfscl_findcl(nmp);
 3826                 if (clp == NULL) {
 3827                         NFSUNLOCKCLSTATE();
 3828                         return (retcnt);
 3829                 }
 3830                 dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh,
 3831                     np->n_fhp->nfh_len);
 3832                 if (dp != NULL) {
 3833                     /*
 3834                      * Wait for outstanding I/O ops to be done.
 3835                      */
 3836                     if (dp->nfsdl_rwlock.nfslock_usecnt > 0) {
 3837                         if (igotlock) {
 3838                             nfsv4_unlock(&clp->nfsc_lock, 0);
 3839                             igotlock = 0;
 3840                         }
 3841                         dp->nfsdl_rwlock.nfslock_lock |= NFSV4LOCK_WANTED;
 3842                         (void) nfsmsleep(&dp->nfsdl_rwlock,
 3843                             NFSCLSTATEMUTEXPTR, PZERO, "nfscld", NULL);
 3844                         continue;
 3845                     }
 3846                     needsrecall = 0;
 3847                     LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
 3848                         if (!LIST_EMPTY(&owp->nfsow_open)) {
 3849                             needsrecall = 1;
 3850                             break;
 3851                         }
 3852                     }
 3853                     if (!needsrecall) {
 3854                         LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
 3855                             if (!LIST_EMPTY(&lp->nfsl_lock)) {
 3856                                 needsrecall = 1;
 3857                                 break;
 3858                             }
 3859                         }
 3860                     }
 3861                     if (needsrecall && !triedrecall) {
 3862                         dp->nfsdl_flags |= NFSCLDL_DELEGRET;
 3863                         islept = 0;
 3864                         while (!igotlock) {
 3865                             igotlock = nfsv4_lock(&clp->nfsc_lock, 1,
 3866                                 &islept, NFSCLSTATEMUTEXPTR);
 3867                             if (islept)
 3868                                 break;
 3869                         }
 3870                         if (islept)
 3871                             continue;
 3872                         NFSUNLOCKCLSTATE();
 3873                         cred = newnfs_getcred();
 3874                         newnfs_copycred(&dp->nfsdl_cred, cred);
 3875                         (void) nfscl_recalldeleg(clp, nmp, dp, vp, cred, p, 0);
 3876                         NFSFREECRED(cred);
 3877                         triedrecall = 1;
 3878                         NFSLOCKCLSTATE();
 3879                         nfsv4_unlock(&clp->nfsc_lock, 0);
 3880                         igotlock = 0;
 3881                         continue;
 3882                     }
 3883                     *stp = dp->nfsdl_stateid;
 3884                     retcnt = 1;
 3885                     nfscl_cleandeleg(dp);
 3886                     nfscl_freedeleg(&clp->nfsc_deleg, dp);
 3887                 }
 3888                 if (igotlock)
 3889                     nfsv4_unlock(&clp->nfsc_lock, 0);
 3890                 NFSUNLOCKCLSTATE();
 3891                 return (retcnt);
 3892         }
 3893 }
 3894 
 3895 /*
 3896  * Look for associated delegation(s) that should be DelegReturned.
 3897  */
 3898 APPLESTATIC int
 3899 nfscl_renamedeleg(vnode_t fvp, nfsv4stateid_t *fstp, int *gotfdp, vnode_t tvp,
 3900     nfsv4stateid_t *tstp, int *gottdp, NFSPROC_T *p)
 3901 {
 3902         struct nfsclclient *clp;
 3903         struct nfscldeleg *dp;
 3904         struct nfsclowner *owp;
 3905         struct nfscllockowner *lp;
 3906         struct nfsmount *nmp;
 3907         struct ucred *cred;
 3908         struct nfsnode *np;
 3909         int igotlock = 0, triedrecall = 0, needsrecall, retcnt = 0, islept;
 3910 
 3911         nmp = VFSTONFS(vnode_mount(fvp));
 3912         *gotfdp = 0;
 3913         *gottdp = 0;
 3914         NFSLOCKCLSTATE();
 3915         /*
 3916          * Loop around waiting for:
 3917          * - outstanding I/O operations on delegations to complete
 3918          * - for a delegation on fvp that has state, lock the client and
 3919          *   do a recall
 3920          * - return delegation(s) with no state.
 3921          */
 3922         while (1) {
 3923                 clp = nfscl_findcl(nmp);
 3924                 if (clp == NULL) {
 3925                         NFSUNLOCKCLSTATE();
 3926                         return (retcnt);
 3927                 }
 3928                 np = VTONFS(fvp);
 3929                 dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh,
 3930                     np->n_fhp->nfh_len);
 3931                 if (dp != NULL && *gotfdp == 0) {
 3932                     /*
 3933                      * Wait for outstanding I/O ops to be done.
 3934                      */
 3935                     if (dp->nfsdl_rwlock.nfslock_usecnt > 0) {
 3936                         if (igotlock) {
 3937                             nfsv4_unlock(&clp->nfsc_lock, 0);
 3938                             igotlock = 0;
 3939                         }
 3940                         dp->nfsdl_rwlock.nfslock_lock |= NFSV4LOCK_WANTED;
 3941                         (void) nfsmsleep(&dp->nfsdl_rwlock,
 3942                             NFSCLSTATEMUTEXPTR, PZERO, "nfscld", NULL);
 3943                         continue;
 3944                     }
 3945                     needsrecall = 0;
 3946                     LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
 3947                         if (!LIST_EMPTY(&owp->nfsow_open)) {
 3948                             needsrecall = 1;
 3949                             break;
 3950                         }
 3951                     }
 3952                     if (!needsrecall) {
 3953                         LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
 3954                             if (!LIST_EMPTY(&lp->nfsl_lock)) {
 3955                                 needsrecall = 1;
 3956                                 break;
 3957                             }
 3958                         }
 3959                     }
 3960                     if (needsrecall && !triedrecall) {
 3961                         dp->nfsdl_flags |= NFSCLDL_DELEGRET;
 3962                         islept = 0;
 3963                         while (!igotlock) {
 3964                             igotlock = nfsv4_lock(&clp->nfsc_lock, 1,
 3965                                 &islept, NFSCLSTATEMUTEXPTR);
 3966                             if (islept)
 3967                                 break;
 3968                         }
 3969                         if (islept)
 3970                             continue;
 3971                         NFSUNLOCKCLSTATE();
 3972                         cred = newnfs_getcred();
 3973                         newnfs_copycred(&dp->nfsdl_cred, cred);
 3974                         (void) nfscl_recalldeleg(clp, nmp, dp, fvp, cred, p, 0);
 3975                         NFSFREECRED(cred);
 3976                         triedrecall = 1;
 3977                         NFSLOCKCLSTATE();
 3978                         nfsv4_unlock(&clp->nfsc_lock, 0);
 3979                         igotlock = 0;
 3980                         continue;
 3981                     }
 3982                     *fstp = dp->nfsdl_stateid;
 3983                     retcnt++;
 3984                     *gotfdp = 1;
 3985                     nfscl_cleandeleg(dp);
 3986                     nfscl_freedeleg(&clp->nfsc_deleg, dp);
 3987                 }
 3988                 if (igotlock) {
 3989                     nfsv4_unlock(&clp->nfsc_lock, 0);
 3990                     igotlock = 0;
 3991                 }
 3992                 if (tvp != NULL) {
 3993                     np = VTONFS(tvp);
 3994                     dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh,
 3995                         np->n_fhp->nfh_len);
 3996                     if (dp != NULL && *gottdp == 0) {
 3997                         /*
 3998                          * Wait for outstanding I/O ops to be done.
 3999                          */
 4000                         if (dp->nfsdl_rwlock.nfslock_usecnt > 0) {
 4001                             dp->nfsdl_rwlock.nfslock_lock |= NFSV4LOCK_WANTED;
 4002                             (void) nfsmsleep(&dp->nfsdl_rwlock,
 4003                                 NFSCLSTATEMUTEXPTR, PZERO, "nfscld", NULL);
 4004                             continue;
 4005                         }
 4006                         LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
 4007                             if (!LIST_EMPTY(&owp->nfsow_open)) {
 4008                                 NFSUNLOCKCLSTATE();
 4009                                 return (retcnt);
 4010                             }
 4011                         }
 4012                         LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
 4013                             if (!LIST_EMPTY(&lp->nfsl_lock)) {
 4014                                 NFSUNLOCKCLSTATE();
 4015                                 return (retcnt);
 4016                             }
 4017                         }
 4018                         *tstp = dp->nfsdl_stateid;
 4019                         retcnt++;
 4020                         *gottdp = 1;
 4021                         nfscl_cleandeleg(dp);
 4022                         nfscl_freedeleg(&clp->nfsc_deleg, dp);
 4023                     }
 4024                 }
 4025                 NFSUNLOCKCLSTATE();
 4026                 return (retcnt);
 4027         }
 4028 }
 4029 
 4030 /*
 4031  * Get a reference on the clientid associated with the mount point.
 4032  * Return 1 if success, 0 otherwise.
 4033  */
 4034 APPLESTATIC int
 4035 nfscl_getref(struct nfsmount *nmp)
 4036 {
 4037         struct nfsclclient *clp;
 4038 
 4039         NFSLOCKCLSTATE();
 4040         clp = nfscl_findcl(nmp);
 4041         if (clp == NULL) {
 4042                 NFSUNLOCKCLSTATE();
 4043                 return (0);
 4044         }
 4045         nfsv4_getref(&clp->nfsc_lock, NULL, NFSCLSTATEMUTEXPTR);
 4046         NFSUNLOCKCLSTATE();
 4047         return (1);
 4048 }
 4049 
 4050 /*
 4051  * Release a reference on a clientid acquired with the above call.
 4052  */
 4053 APPLESTATIC void
 4054 nfscl_relref(struct nfsmount *nmp)
 4055 {
 4056         struct nfsclclient *clp;
 4057 
 4058         NFSLOCKCLSTATE();
 4059         clp = nfscl_findcl(nmp);
 4060         if (clp == NULL) {
 4061                 NFSUNLOCKCLSTATE();
 4062                 return;
 4063         }
 4064         nfsv4_relref(&clp->nfsc_lock);
 4065         NFSUNLOCKCLSTATE();
 4066 }
 4067 
 4068 /*
 4069  * Save the size attribute in the delegation, since the nfsnode
 4070  * is going away.
 4071  */
 4072 APPLESTATIC void
 4073 nfscl_reclaimnode(vnode_t vp)
 4074 {
 4075         struct nfsclclient *clp;
 4076         struct nfscldeleg *dp;
 4077         struct nfsnode *np = VTONFS(vp);
 4078         struct nfsmount *nmp;
 4079 
 4080         nmp = VFSTONFS(vnode_mount(vp));
 4081         if (!NFSHASNFSV4(nmp))
 4082                 return;
 4083         NFSLOCKCLSTATE();
 4084         clp = nfscl_findcl(nmp);
 4085         if (clp == NULL) {
 4086                 NFSUNLOCKCLSTATE();
 4087                 return;
 4088         }
 4089         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 4090         if (dp != NULL && (dp->nfsdl_flags & NFSCLDL_WRITE))
 4091                 dp->nfsdl_size = np->n_size;
 4092         NFSUNLOCKCLSTATE();
 4093 }
 4094 
 4095 /*
 4096  * Get the saved size attribute in the delegation, since it is a
 4097  * newly allocated nfsnode.
 4098  */
 4099 APPLESTATIC void
 4100 nfscl_newnode(vnode_t vp)
 4101 {
 4102         struct nfsclclient *clp;
 4103         struct nfscldeleg *dp;
 4104         struct nfsnode *np = VTONFS(vp);
 4105         struct nfsmount *nmp;
 4106 
 4107         nmp = VFSTONFS(vnode_mount(vp));
 4108         if (!NFSHASNFSV4(nmp))
 4109                 return;
 4110         NFSLOCKCLSTATE();
 4111         clp = nfscl_findcl(nmp);
 4112         if (clp == NULL) {
 4113                 NFSUNLOCKCLSTATE();
 4114                 return;
 4115         }
 4116         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 4117         if (dp != NULL && (dp->nfsdl_flags & NFSCLDL_WRITE))
 4118                 np->n_size = dp->nfsdl_size;
 4119         NFSUNLOCKCLSTATE();
 4120 }
 4121 
 4122 /*
 4123  * If there is a valid write delegation for this file, set the modtime
 4124  * to the local clock time.
 4125  */
 4126 APPLESTATIC void
 4127 nfscl_delegmodtime(vnode_t vp)
 4128 {
 4129         struct nfsclclient *clp;
 4130         struct nfscldeleg *dp;
 4131         struct nfsnode *np = VTONFS(vp);
 4132         struct nfsmount *nmp;
 4133 
 4134         nmp = VFSTONFS(vnode_mount(vp));
 4135         if (!NFSHASNFSV4(nmp))
 4136                 return;
 4137         NFSLOCKCLSTATE();
 4138         clp = nfscl_findcl(nmp);
 4139         if (clp == NULL) {
 4140                 NFSUNLOCKCLSTATE();
 4141                 return;
 4142         }
 4143         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 4144         if (dp != NULL && (dp->nfsdl_flags & NFSCLDL_WRITE)) {
 4145                 NFSGETNANOTIME(&dp->nfsdl_modtime);
 4146                 dp->nfsdl_flags |= NFSCLDL_MODTIMESET;
 4147         }
 4148         NFSUNLOCKCLSTATE();
 4149 }
 4150 
 4151 /*
 4152  * If there is a valid write delegation for this file with a modtime set,
 4153  * put that modtime in mtime.
 4154  */
 4155 APPLESTATIC void
 4156 nfscl_deleggetmodtime(vnode_t vp, struct timespec *mtime)
 4157 {
 4158         struct nfsclclient *clp;
 4159         struct nfscldeleg *dp;
 4160         struct nfsnode *np = VTONFS(vp);
 4161         struct nfsmount *nmp;
 4162 
 4163         nmp = VFSTONFS(vnode_mount(vp));
 4164         if (!NFSHASNFSV4(nmp))
 4165                 return;
 4166         NFSLOCKCLSTATE();
 4167         clp = nfscl_findcl(nmp);
 4168         if (clp == NULL) {
 4169                 NFSUNLOCKCLSTATE();
 4170                 return;
 4171         }
 4172         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 4173         if (dp != NULL &&
 4174             (dp->nfsdl_flags & (NFSCLDL_WRITE | NFSCLDL_MODTIMESET)) ==
 4175             (NFSCLDL_WRITE | NFSCLDL_MODTIMESET))
 4176                 *mtime = dp->nfsdl_modtime;
 4177         NFSUNLOCKCLSTATE();
 4178 }
 4179 
 4180 static int
 4181 nfscl_errmap(struct nfsrv_descript *nd)
 4182 {
 4183         short *defaulterrp, *errp;
 4184 
 4185         if (!nd->nd_repstat)
 4186                 return (0);
 4187         if (nd->nd_procnum == NFSPROC_NOOP)
 4188                 return (txdr_unsigned(nd->nd_repstat & 0xffff));
 4189         if (nd->nd_repstat == EBADRPC)
 4190                 return (txdr_unsigned(NFSERR_BADXDR));
 4191         if (nd->nd_repstat == NFSERR_MINORVERMISMATCH ||
 4192             nd->nd_repstat == NFSERR_OPILLEGAL)
 4193                 return (txdr_unsigned(nd->nd_repstat));
 4194         errp = defaulterrp = nfscl_cberrmap[nd->nd_procnum];
 4195         while (*++errp)
 4196                 if (*errp == (short)nd->nd_repstat)
 4197                         return (txdr_unsigned(nd->nd_repstat));
 4198         return (txdr_unsigned(*defaulterrp));
 4199 }
 4200 

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