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/8.1/sys/fs/nfsclient/nfs_clstate.c 207455 2010-05-01 00:50:51Z 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 & NFSCLDL_RECALL) ||
  933                     (type == F_WRLCK && !(dp->nfsdl_flags & NFSCLDL_WRITE))))
  934                         dp = NULL;
  935         }
  936         if (dp != NULL) {
  937                 /* Now, find the associated open to get the correct openowner */
  938                 ret = nfscl_getopen(&dp->nfsdl_owner, np->n_fhp->nfh_fh,
  939                     np->n_fhp->nfh_len, NULL, p, mode, NULL, &op);
  940                 if (ret)
  941                         ret = nfscl_getopen(&clp->nfsc_owner,
  942                             np->n_fhp->nfh_fh, np->n_fhp->nfh_len, NULL, p,
  943                             mode, NULL, &op);
  944                 if (!ret) {
  945                         lhp = &dp->nfsdl_lock;
  946                         TAILQ_REMOVE(&clp->nfsc_deleg, dp, nfsdl_list);
  947                         TAILQ_INSERT_HEAD(&clp->nfsc_deleg, dp, nfsdl_list);
  948                         dp->nfsdl_timestamp = NFSD_MONOSEC + 120;
  949                         donelocally = 1;
  950                 } else {
  951                         dp = NULL;
  952                 }
  953         }
  954         if (!donelocally) {
  955                 /*
  956                  * Get the related Open.
  957                  */
  958                 if (recovery)
  959                         error = nfscl_getopen(&clp->nfsc_owner,
  960                             np->n_fhp->nfh_fh, np->n_fhp->nfh_len, ropenownp,
  961                             NULL, mode, NULL, &op);
  962                 else
  963                         error = nfscl_getopen(&clp->nfsc_owner,
  964                             np->n_fhp->nfh_fh, np->n_fhp->nfh_len, NULL, p,
  965                             mode, NULL, &op);
  966                 if (!error)
  967                         lhp = &op->nfso_lock;
  968         }
  969         if (!error && !recovery)
  970                 error = nfscl_localconflict(clp, np->n_fhp->nfh_fh,
  971                     np->n_fhp->nfh_len, nlop, ownp, ldp, NULL);
  972         if (error) {
  973                 if (!recovery) {
  974                         nfscl_clrelease(clp);
  975                         NFSUNLOCKCLSTATE();
  976                 }
  977                 FREE((caddr_t)nlp, M_NFSCLLOCKOWNER);
  978                 FREE((caddr_t)otherlop, M_NFSCLLOCK);
  979                 FREE((caddr_t)nlop, M_NFSCLLOCK);
  980                 return (error);
  981         }
  982 
  983         /*
  984          * Ok, see if a lockowner exists and create one, as required.
  985          */
  986         LIST_FOREACH(lp, lhp, nfsl_list) {
  987                 if (!NFSBCMP(lp->nfsl_owner, ownp, NFSV4CL_LOCKNAMELEN))
  988                         break;
  989         }
  990         if (lp == NULL) {
  991                 NFSBCOPY(ownp, nlp->nfsl_owner, NFSV4CL_LOCKNAMELEN);
  992                 if (recovery)
  993                         NFSBCOPY(ropenownp, nlp->nfsl_openowner,
  994                             NFSV4CL_LOCKNAMELEN);
  995                 else
  996                         NFSBCOPY(op->nfso_own->nfsow_owner, nlp->nfsl_openowner,
  997                             NFSV4CL_LOCKNAMELEN);
  998                 nlp->nfsl_seqid = 0;
  999                 nlp->nfsl_defunct = 0;
 1000                 nlp->nfsl_inprog = NULL;
 1001                 nfscl_lockinit(&nlp->nfsl_rwlock);
 1002                 LIST_INIT(&nlp->nfsl_lock);
 1003                 if (donelocally) {
 1004                         nlp->nfsl_open = NULL;
 1005                         newnfsstats.cllocallockowners++;
 1006                 } else {
 1007                         nlp->nfsl_open = op;
 1008                         newnfsstats.cllockowners++;
 1009                 }
 1010                 LIST_INSERT_HEAD(lhp, nlp, nfsl_list);
 1011                 lp = nlp;
 1012                 nlp = NULL;
 1013                 *newonep = 1;
 1014         }
 1015 
 1016         /*
 1017          * Now, update the byte ranges for locks.
 1018          */
 1019         ret = nfscl_updatelock(lp, &nlop, &otherlop, donelocally);
 1020         if (!ret)
 1021                 donelocally = 1;
 1022         if (donelocally) {
 1023                 *donelocallyp = 1;
 1024                 if (!recovery)
 1025                         nfscl_clrelease(clp);
 1026         } else {
 1027                 /*
 1028                  * Serial modifications on the lock owner for multiple threads
 1029                  * for the same process using a read/write lock.
 1030                  */
 1031                 if (!recovery)
 1032                         nfscl_lockexcl(&lp->nfsl_rwlock, NFSCLSTATEMUTEXPTR);
 1033         }
 1034         if (!recovery)
 1035                 NFSUNLOCKCLSTATE();
 1036 
 1037         if (nlp)
 1038                 FREE((caddr_t)nlp, M_NFSCLLOCKOWNER);
 1039         if (nlop)
 1040                 FREE((caddr_t)nlop, M_NFSCLLOCK);
 1041         if (otherlop)
 1042                 FREE((caddr_t)otherlop, M_NFSCLLOCK);
 1043 
 1044         *lpp = lp;
 1045         return (0);
 1046 }
 1047 
 1048 /*
 1049  * Called to unlock a byte range, for LockU.
 1050  */
 1051 APPLESTATIC int
 1052 nfscl_relbytelock(vnode_t vp, u_int64_t off, u_int64_t len,
 1053     __unused struct ucred *cred, NFSPROC_T *p, int callcnt,
 1054     struct nfsclclient *clp, struct nfscllockowner **lpp, int *dorpcp)
 1055 {
 1056         struct nfscllockowner *lp;
 1057         struct nfsclowner *owp;
 1058         struct nfsclopen *op;
 1059         struct nfscllock *nlop, *other_lop = NULL;
 1060         struct nfscldeleg *dp;
 1061         struct nfsnode *np;
 1062         u_int8_t own[NFSV4CL_LOCKNAMELEN];
 1063         int ret = 0, fnd;
 1064 
 1065         np = VTONFS(vp);
 1066         *lpp = NULL;
 1067         *dorpcp = 0;
 1068 
 1069         /*
 1070          * Might need these, so MALLOC them now, to
 1071          * avoid a tsleep() in MALLOC later.
 1072          */
 1073         MALLOC(nlop, struct nfscllock *,
 1074             sizeof (struct nfscllock), M_NFSCLLOCK, M_WAITOK);
 1075         nlop->nfslo_type = F_UNLCK;
 1076         nlop->nfslo_first = off;
 1077         if (len == NFS64BITSSET) {
 1078                 nlop->nfslo_end = NFS64BITSSET;
 1079         } else {
 1080                 nlop->nfslo_end = off + len;
 1081                 if (nlop->nfslo_end <= nlop->nfslo_first) {
 1082                         FREE((caddr_t)nlop, M_NFSCLLOCK);
 1083                         return (NFSERR_INVAL);
 1084                 }
 1085         }
 1086         if (callcnt == 0) {
 1087                 MALLOC(other_lop, struct nfscllock *,
 1088                     sizeof (struct nfscllock), M_NFSCLLOCK, M_WAITOK);
 1089                 *other_lop = *nlop;
 1090         }
 1091         nfscl_filllockowner(p, own);
 1092         dp = NULL;
 1093         NFSLOCKCLSTATE();
 1094         if (callcnt == 0)
 1095                 dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh,
 1096                     np->n_fhp->nfh_len);
 1097 
 1098         /*
 1099          * First, unlock any local regions on a delegation.
 1100          */
 1101         if (dp != NULL) {
 1102                 /* Look for this lockowner. */
 1103                 LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
 1104                         if (!NFSBCMP(lp->nfsl_owner, own,
 1105                             NFSV4CL_LOCKNAMELEN))
 1106                                 break;
 1107                 }
 1108                 if (lp != NULL)
 1109                         /* Use other_lop, so nlop is still available */
 1110                         (void)nfscl_updatelock(lp, &other_lop, NULL, 1);
 1111         }
 1112 
 1113         /*
 1114          * Now, find a matching open/lockowner that hasn't already been done,
 1115          * as marked by nfsl_inprog.
 1116          */
 1117         lp = NULL;
 1118         fnd = 0;
 1119         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 1120             LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 1121                 if (op->nfso_fhlen == np->n_fhp->nfh_len &&
 1122                     !NFSBCMP(op->nfso_fh, np->n_fhp->nfh_fh, op->nfso_fhlen)) {
 1123                     LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
 1124                         if (lp->nfsl_inprog == NULL &&
 1125                             !NFSBCMP(lp->nfsl_owner, own,
 1126                              NFSV4CL_LOCKNAMELEN)) {
 1127                                 fnd = 1;
 1128                                 break;
 1129                         }
 1130                     }
 1131                     if (fnd)
 1132                         break;
 1133                 }
 1134             }
 1135             if (fnd)
 1136                 break;
 1137         }
 1138 
 1139         if (lp != NULL) {
 1140                 ret = nfscl_updatelock(lp, &nlop, NULL, 0);
 1141                 if (ret)
 1142                         *dorpcp = 1;
 1143                 /*
 1144                  * Serial modifications on the lock owner for multiple
 1145                  * threads for the same process using a read/write lock.
 1146                  */
 1147                 lp->nfsl_inprog = p;
 1148                 nfscl_lockexcl(&lp->nfsl_rwlock, NFSCLSTATEMUTEXPTR);
 1149                 *lpp = lp;
 1150         }
 1151         NFSUNLOCKCLSTATE();
 1152         if (nlop)
 1153                 FREE((caddr_t)nlop, M_NFSCLLOCK);
 1154         if (other_lop)
 1155                 FREE((caddr_t)other_lop, M_NFSCLLOCK);
 1156         return (0);
 1157 }
 1158 
 1159 /*
 1160  * Release all lockowners marked in progess for this process and file.
 1161  */
 1162 APPLESTATIC void
 1163 nfscl_releasealllocks(struct nfsclclient *clp, vnode_t vp, NFSPROC_T *p)
 1164 {
 1165         struct nfsclowner *owp;
 1166         struct nfsclopen *op;
 1167         struct nfscllockowner *lp;
 1168         struct nfsnode *np;
 1169         u_int8_t own[NFSV4CL_LOCKNAMELEN];
 1170 
 1171         np = VTONFS(vp);
 1172         nfscl_filllockowner(p, own);
 1173         NFSLOCKCLSTATE();
 1174         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 1175             LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 1176                 if (op->nfso_fhlen == np->n_fhp->nfh_len &&
 1177                     !NFSBCMP(op->nfso_fh, np->n_fhp->nfh_fh, op->nfso_fhlen)) {
 1178                     LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
 1179                         if (lp->nfsl_inprog == p &&
 1180                             !NFSBCMP(lp->nfsl_owner, own,
 1181                             NFSV4CL_LOCKNAMELEN)) {
 1182                             lp->nfsl_inprog = NULL;
 1183                             nfscl_lockunlock(&lp->nfsl_rwlock);
 1184                         }
 1185                     }
 1186                 }
 1187             }
 1188         }
 1189         nfscl_clrelease(clp);
 1190         NFSUNLOCKCLSTATE();
 1191 }
 1192 
 1193 /*
 1194  * Called to find out if any bytes within the byte range specified are
 1195  * write locked by the calling process. Used to determine if flushing
 1196  * is required before a LockU.
 1197  * If in doubt, return 1, so the flush will occur.
 1198  */
 1199 APPLESTATIC int
 1200 nfscl_checkwritelocked(vnode_t vp, struct flock *fl,
 1201     struct ucred *cred, NFSPROC_T *p)
 1202 {
 1203         struct nfsclowner *owp;
 1204         struct nfscllockowner *lp;
 1205         struct nfsclopen *op;
 1206         struct nfsclclient *clp;
 1207         struct nfscllock *lop;
 1208         struct nfscldeleg *dp;
 1209         struct nfsnode *np;
 1210         u_int64_t off, end;
 1211         u_int8_t own[NFSV4CL_LOCKNAMELEN];
 1212         int error = 0;
 1213 
 1214         np = VTONFS(vp);
 1215         switch (fl->l_whence) {
 1216         case SEEK_SET:
 1217         case SEEK_CUR:
 1218                 /*
 1219                  * Caller is responsible for adding any necessary offset
 1220                  * when SEEK_CUR is used.
 1221                  */
 1222                 off = fl->l_start;
 1223                 break;
 1224         case SEEK_END:
 1225                 off = np->n_size + fl->l_start;
 1226                 break;
 1227         default:
 1228                 return (1);
 1229         };
 1230         if (fl->l_len != 0) {
 1231                 end = off + fl->l_len;
 1232                 if (end < off)
 1233                         return (1);
 1234         } else {
 1235                 end = NFS64BITSSET;
 1236         }
 1237 
 1238         error = nfscl_getcl(vp, cred, p, &clp);
 1239         if (error)
 1240                 return (1);
 1241         nfscl_filllockowner(p, own);
 1242         NFSLOCKCLSTATE();
 1243 
 1244         /*
 1245          * First check the delegation locks.
 1246          */
 1247         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 1248         if (dp != NULL) {
 1249                 LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
 1250                         if (!NFSBCMP(lp->nfsl_owner, own,
 1251                             NFSV4CL_LOCKNAMELEN))
 1252                                 break;
 1253                 }
 1254                 if (lp != NULL) {
 1255                         LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
 1256                                 if (lop->nfslo_first >= end)
 1257                                         break;
 1258                                 if (lop->nfslo_end <= off)
 1259                                         continue;
 1260                                 if (lop->nfslo_type == F_WRLCK) {
 1261                                         nfscl_clrelease(clp);
 1262                                         NFSUNLOCKCLSTATE();
 1263                                         return (1);
 1264                                 }
 1265                         }
 1266                 }
 1267         }
 1268 
 1269         /*
 1270          * Now, check state against the server.
 1271          */
 1272         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 1273             LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 1274                 if (op->nfso_fhlen == np->n_fhp->nfh_len &&
 1275                     !NFSBCMP(op->nfso_fh, np->n_fhp->nfh_fh, op->nfso_fhlen)) {
 1276                     LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
 1277                         if (!NFSBCMP(lp->nfsl_owner, own,
 1278                             NFSV4CL_LOCKNAMELEN))
 1279                             break;
 1280                     }
 1281                     if (lp != NULL) {
 1282                         LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
 1283                             if (lop->nfslo_first >= end)
 1284                                 break;
 1285                             if (lop->nfslo_end <= off)
 1286                                 continue;
 1287                             if (lop->nfslo_type == F_WRLCK) {
 1288                                 nfscl_clrelease(clp);
 1289                                 NFSUNLOCKCLSTATE();
 1290                                 return (1);
 1291                             }
 1292                         }
 1293                     }
 1294                 }
 1295             }
 1296         }
 1297         nfscl_clrelease(clp);
 1298         NFSUNLOCKCLSTATE();
 1299         return (0);
 1300 }
 1301 
 1302 /*
 1303  * Release a byte range lock owner structure.
 1304  */
 1305 APPLESTATIC void
 1306 nfscl_lockrelease(struct nfscllockowner *lp, int error, int candelete)
 1307 {
 1308         struct nfsclclient *clp;
 1309 
 1310         if (lp == NULL)
 1311                 return;
 1312         NFSLOCKCLSTATE();
 1313         clp = lp->nfsl_open->nfso_own->nfsow_clp;
 1314         if (error != 0 && candelete &&
 1315             (lp->nfsl_rwlock.nfslock_lock & NFSV4LOCK_WANTED) == 0)
 1316                 nfscl_freelockowner(lp, 0);
 1317         else
 1318                 nfscl_lockunlock(&lp->nfsl_rwlock);
 1319         nfscl_clrelease(clp);
 1320         NFSUNLOCKCLSTATE();
 1321 }
 1322 
 1323 /*
 1324  * Free up an open structure and any associated byte range lock structures.
 1325  */
 1326 APPLESTATIC void
 1327 nfscl_freeopen(struct nfsclopen *op, int local)
 1328 {
 1329 
 1330         LIST_REMOVE(op, nfso_list);
 1331         nfscl_freealllocks(&op->nfso_lock, local);
 1332         FREE((caddr_t)op, M_NFSCLOPEN);
 1333         if (local)
 1334                 newnfsstats.cllocalopens--;
 1335         else
 1336                 newnfsstats.clopens--;
 1337 }
 1338 
 1339 /*
 1340  * Free up all lock owners and associated locks.
 1341  */
 1342 static void
 1343 nfscl_freealllocks(struct nfscllockownerhead *lhp, int local)
 1344 {
 1345         struct nfscllockowner *lp, *nlp;
 1346 
 1347         LIST_FOREACH_SAFE(lp, lhp, nfsl_list, nlp) {
 1348                 if ((lp->nfsl_rwlock.nfslock_lock & NFSV4LOCK_WANTED))
 1349                         panic("nfscllckw");
 1350                 nfscl_freelockowner(lp, local);
 1351         }
 1352 }
 1353 
 1354 /*
 1355  * Called for an Open when NFSERR_EXPIRED is received from the server.
 1356  * If there are no byte range locks nor a Share Deny lost, try to do a
 1357  * fresh Open. Otherwise, free the open.
 1358  */
 1359 static int
 1360 nfscl_expireopen(struct nfsclclient *clp, struct nfsclopen *op,
 1361     struct nfsmount *nmp, struct ucred *cred, NFSPROC_T *p)
 1362 {
 1363         struct nfscllockowner *lp;
 1364         struct nfscldeleg *dp;
 1365         int mustdelete = 0, error;
 1366 
 1367         /*
 1368          * Look for any byte range lock(s).
 1369          */
 1370         LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
 1371                 if (!LIST_EMPTY(&lp->nfsl_lock)) {
 1372                         mustdelete = 1;
 1373                         break;
 1374                 }
 1375         }
 1376 
 1377         /*
 1378          * If no byte range lock(s) nor a Share deny, try to re-open.
 1379          */
 1380         if (!mustdelete && (op->nfso_mode & NFSLCK_DENYBITS) == 0) {
 1381                 newnfs_copycred(&op->nfso_cred, cred);
 1382                 dp = NULL;
 1383                 error = nfsrpc_reopen(nmp, op->nfso_fh,
 1384                     op->nfso_fhlen, op->nfso_mode, op, &dp, cred, p);
 1385                 if (error) {
 1386                         mustdelete = 1;
 1387                         if (dp != NULL) {
 1388                                 FREE((caddr_t)dp, M_NFSCLDELEG);
 1389                                 dp = NULL;
 1390                         }
 1391                 }
 1392                 if (dp != NULL)
 1393                         nfscl_deleg(nmp->nm_mountp, clp, op->nfso_fh,
 1394                             op->nfso_fhlen, cred, p, &dp);
 1395         }
 1396 
 1397         /*
 1398          * If a byte range lock or Share deny or couldn't re-open, free it.
 1399          */
 1400         if (mustdelete)
 1401                 nfscl_freeopen(op, 0);
 1402         return (mustdelete);
 1403 }
 1404 
 1405 /*
 1406  * Free up an open owner structure.
 1407  */
 1408 static void
 1409 nfscl_freeopenowner(struct nfsclowner *owp, int local)
 1410 {
 1411 
 1412         LIST_REMOVE(owp, nfsow_list);
 1413         FREE((caddr_t)owp, M_NFSCLOWNER);
 1414         if (local)
 1415                 newnfsstats.cllocalopenowners--;
 1416         else
 1417                 newnfsstats.clopenowners--;
 1418 }
 1419 
 1420 /*
 1421  * Free up a byte range lock owner structure.
 1422  */
 1423 static void
 1424 nfscl_freelockowner(struct nfscllockowner *lp, int local)
 1425 {
 1426         struct nfscllock *lop, *nlop;
 1427 
 1428         LIST_REMOVE(lp, nfsl_list);
 1429         LIST_FOREACH_SAFE(lop, &lp->nfsl_lock, nfslo_list, nlop) {
 1430                 nfscl_freelock(lop, local);
 1431         }
 1432         FREE((caddr_t)lp, M_NFSCLLOCKOWNER);
 1433         if (local)
 1434                 newnfsstats.cllocallockowners--;
 1435         else
 1436                 newnfsstats.cllockowners--;
 1437 }
 1438 
 1439 /*
 1440  * Free up a byte range lock structure.
 1441  */
 1442 APPLESTATIC void
 1443 nfscl_freelock(struct nfscllock *lop, int local)
 1444 {
 1445 
 1446         LIST_REMOVE(lop, nfslo_list);
 1447         FREE((caddr_t)lop, M_NFSCLLOCK);
 1448         if (local)
 1449                 newnfsstats.cllocallocks--;
 1450         else
 1451                 newnfsstats.cllocks--;
 1452 }
 1453 
 1454 /*
 1455  * Clean out the state related to a delegation.
 1456  */
 1457 static void
 1458 nfscl_cleandeleg(struct nfscldeleg *dp)
 1459 {
 1460         struct nfsclowner *owp, *nowp;
 1461         struct nfsclopen *op;
 1462 
 1463         LIST_FOREACH_SAFE(owp, &dp->nfsdl_owner, nfsow_list, nowp) {
 1464                 op = LIST_FIRST(&owp->nfsow_open);
 1465                 if (op != NULL) {
 1466                         if (LIST_NEXT(op, nfso_list) != NULL)
 1467                                 panic("nfscleandel");
 1468                         nfscl_freeopen(op, 1);
 1469                 }
 1470                 nfscl_freeopenowner(owp, 1);
 1471         }
 1472         nfscl_freealllocks(&dp->nfsdl_lock, 1);
 1473 }
 1474 
 1475 /*
 1476  * Free a delegation.
 1477  */
 1478 static void
 1479 nfscl_freedeleg(struct nfscldeleghead *hdp, struct nfscldeleg *dp)
 1480 {
 1481 
 1482         TAILQ_REMOVE(hdp, dp, nfsdl_list);
 1483         LIST_REMOVE(dp, nfsdl_hash);
 1484         FREE((caddr_t)dp, M_NFSCLDELEG);
 1485         newnfsstats.cldelegates--;
 1486         nfscl_delegcnt--;
 1487 }
 1488 
 1489 /*
 1490  * Free up all state related to this client structure.
 1491  */
 1492 static void
 1493 nfscl_cleanclient(struct nfsclclient *clp)
 1494 {
 1495         struct nfsclowner *owp, *nowp;
 1496         struct nfsclopen *op, *nop;
 1497         struct nfscllockowner *lp, *nlp;
 1498 
 1499 
 1500         /* get rid of defunct lockowners */
 1501         LIST_FOREACH_SAFE(lp, &clp->nfsc_defunctlockowner, nfsl_list, nlp) {
 1502                 nfscl_freelockowner(lp, 0);
 1503         }
 1504 
 1505         /* Now, all the OpenOwners, etc. */
 1506         LIST_FOREACH_SAFE(owp, &clp->nfsc_owner, nfsow_list, nowp) {
 1507                 LIST_FOREACH_SAFE(op, &owp->nfsow_open, nfso_list, nop) {
 1508                         nfscl_freeopen(op, 0);
 1509                 }
 1510                 nfscl_freeopenowner(owp, 0);
 1511         }
 1512 }
 1513 
 1514 /*
 1515  * Called when an NFSERR_EXPIRED is received from the server.
 1516  */
 1517 static void
 1518 nfscl_expireclient(struct nfsclclient *clp, struct nfsmount *nmp,
 1519     struct ucred *cred, NFSPROC_T *p)
 1520 {
 1521         struct nfsclowner *owp, *nowp, *towp;
 1522         struct nfsclopen *op, *nop, *top;
 1523         struct nfscldeleg *dp, *ndp;
 1524         int ret, printed = 0;
 1525 
 1526         /*
 1527          * First, merge locally issued Opens into the list for the server.
 1528          */
 1529         dp = TAILQ_FIRST(&clp->nfsc_deleg);
 1530         while (dp != NULL) {
 1531             ndp = TAILQ_NEXT(dp, nfsdl_list);
 1532             owp = LIST_FIRST(&dp->nfsdl_owner);
 1533             while (owp != NULL) {
 1534                 nowp = LIST_NEXT(owp, nfsow_list);
 1535                 op = LIST_FIRST(&owp->nfsow_open);
 1536                 if (op != NULL) {
 1537                     if (LIST_NEXT(op, nfso_list) != NULL)
 1538                         panic("nfsclexp");
 1539                     LIST_FOREACH(towp, &clp->nfsc_owner, nfsow_list) {
 1540                         if (!NFSBCMP(towp->nfsow_owner, owp->nfsow_owner,
 1541                             NFSV4CL_LOCKNAMELEN))
 1542                             break;
 1543                     }
 1544                     if (towp != NULL) {
 1545                         /* Merge opens in */
 1546                         LIST_FOREACH(top, &towp->nfsow_open, nfso_list) {
 1547                             if (top->nfso_fhlen == op->nfso_fhlen &&
 1548                                 !NFSBCMP(top->nfso_fh, op->nfso_fh,
 1549                                  op->nfso_fhlen)) {
 1550                                 top->nfso_mode |= op->nfso_mode;
 1551                                 top->nfso_opencnt += op->nfso_opencnt;
 1552                                 break;
 1553                             }
 1554                         }
 1555                         if (top == NULL) {
 1556                             /* Just add the open to the owner list */
 1557                             LIST_REMOVE(op, nfso_list);
 1558                             op->nfso_own = towp;
 1559                             LIST_INSERT_HEAD(&towp->nfsow_open, op, nfso_list);
 1560                             newnfsstats.cllocalopens--;
 1561                             newnfsstats.clopens++;
 1562                         }
 1563                     } else {
 1564                         /* Just add the openowner to the client list */
 1565                         LIST_REMOVE(owp, nfsow_list);
 1566                         owp->nfsow_clp = clp;
 1567                         LIST_INSERT_HEAD(&clp->nfsc_owner, owp, nfsow_list);
 1568                         newnfsstats.cllocalopenowners--;
 1569                         newnfsstats.clopenowners++;
 1570                         newnfsstats.cllocalopens--;
 1571                         newnfsstats.clopens++;
 1572                     }
 1573                 }
 1574                 owp = nowp;
 1575             }
 1576             if (!printed && !LIST_EMPTY(&dp->nfsdl_lock)) {
 1577                 printed = 1;
 1578                 printf("nfsv4 expired locks lost\n");
 1579             }
 1580             nfscl_cleandeleg(dp);
 1581             nfscl_freedeleg(&clp->nfsc_deleg, dp);
 1582             dp = ndp;
 1583         }
 1584         if (!TAILQ_EMPTY(&clp->nfsc_deleg))
 1585             panic("nfsclexp");
 1586 
 1587         /*
 1588          * Now, try and reopen against the server.
 1589          */
 1590         LIST_FOREACH_SAFE(owp, &clp->nfsc_owner, nfsow_list, nowp) {
 1591                 owp->nfsow_seqid = 0;
 1592                 LIST_FOREACH_SAFE(op, &owp->nfsow_open, nfso_list, nop) {
 1593                         ret = nfscl_expireopen(clp, op, nmp, cred, p);
 1594                         if (ret && !printed) {
 1595                                 printed = 1;
 1596                                 printf("nfsv4 expired locks lost\n");
 1597                         }
 1598                 }
 1599                 if (LIST_EMPTY(&owp->nfsow_open))
 1600                         nfscl_freeopenowner(owp, 0);
 1601         }
 1602 }
 1603 
 1604 #ifndef __FreeBSD__
 1605 /*
 1606  * Called from exit() upon process termination.
 1607  */
 1608 APPLESTATIC void
 1609 nfscl_cleanup(NFSPROC_T *p)
 1610 {
 1611         struct nfsclclient *clp;
 1612         u_int8_t own[NFSV4CL_LOCKNAMELEN];
 1613 
 1614         if (!nfscl_inited)
 1615                 return;
 1616         nfscl_filllockowner(p, own);
 1617 
 1618         NFSLOCKCLSTATE();
 1619         /*
 1620          * Loop through all the clientids, looking for the OpenOwners.
 1621          */
 1622         LIST_FOREACH(clp, &nfsclhead, nfsc_list)
 1623                 nfscl_cleanup_common(clp, own);
 1624         NFSUNLOCKCLSTATE();
 1625 }
 1626 #endif  /* !__FreeBSD__ */
 1627 
 1628 /*
 1629  * Common code used by nfscl_cleanup() and nfscl_cleanupkext().
 1630  * Must be called with CLSTATE lock held.
 1631  */
 1632 static void
 1633 nfscl_cleanup_common(struct nfsclclient *clp, u_int8_t *own)
 1634 {
 1635         struct nfsclowner *owp, *nowp;
 1636         struct nfsclopen *op;
 1637         struct nfscllockowner *lp, *nlp;
 1638         struct nfscldeleg *dp;
 1639 
 1640         /* First, get rid of local locks on delegations. */
 1641         TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
 1642                 LIST_FOREACH_SAFE(lp, &dp->nfsdl_lock, nfsl_list, nlp) {
 1643                     if (!NFSBCMP(lp->nfsl_owner, own, NFSV4CL_LOCKNAMELEN)) {
 1644                         if ((lp->nfsl_rwlock.nfslock_lock & NFSV4LOCK_WANTED))
 1645                             panic("nfscllckw");
 1646                         nfscl_freelockowner(lp, 1);
 1647                     }
 1648                 }
 1649         }
 1650         owp = LIST_FIRST(&clp->nfsc_owner);
 1651         while (owp != NULL) {
 1652                 nowp = LIST_NEXT(owp, nfsow_list);
 1653                 if (!NFSBCMP(owp->nfsow_owner, own,
 1654                     NFSV4CL_LOCKNAMELEN)) {
 1655                         /*
 1656                          * If there are children that haven't closed the
 1657                          * file descriptors yet, the opens will still be
 1658                          * here. For that case, let the renew thread clear
 1659                          * out the OpenOwner later.
 1660                          */
 1661                         if (LIST_EMPTY(&owp->nfsow_open))
 1662                                 nfscl_freeopenowner(owp, 0);
 1663                         else
 1664                                 owp->nfsow_defunct = 1;
 1665                 } else {
 1666                         /* look for lockowners on other opens */
 1667                         LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 1668                                 LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
 1669                                         if (!NFSBCMP(lp->nfsl_owner, own,
 1670                                             NFSV4CL_LOCKNAMELEN))
 1671                                                 lp->nfsl_defunct = 1;
 1672                                 }
 1673                         }
 1674                 }
 1675                 owp = nowp;
 1676         }
 1677 
 1678         /* and check the defunct list */
 1679         LIST_FOREACH(lp, &clp->nfsc_defunctlockowner, nfsl_list) {
 1680                 if (!NFSBCMP(lp->nfsl_owner, own, NFSV4CL_LOCKNAMELEN))
 1681                     lp->nfsl_defunct = 1;
 1682         }
 1683 }
 1684 
 1685 #if defined(APPLEKEXT) || defined(__FreeBSD__)
 1686 /*
 1687  * Simulate the call nfscl_cleanup() by looking for open owners associated
 1688  * with processes that no longer exist, since a call to nfscl_cleanup()
 1689  * can't be patched into exit().
 1690  */
 1691 static void
 1692 nfscl_cleanupkext(struct nfsclclient *clp)
 1693 {
 1694         struct nfsclowner *owp, *nowp;
 1695         struct nfscllockowner *lp;
 1696 
 1697         NFSPROCLISTLOCK();
 1698         NFSLOCKCLSTATE();
 1699         LIST_FOREACH_SAFE(owp, &clp->nfsc_owner, nfsow_list, nowp) {
 1700                 if (nfscl_procdoesntexist(owp->nfsow_owner))
 1701                         nfscl_cleanup_common(clp, owp->nfsow_owner);
 1702         }
 1703 
 1704         /* and check the defunct list */
 1705         LIST_FOREACH(lp, &clp->nfsc_defunctlockowner, nfsl_list) {
 1706                 if (nfscl_procdoesntexist(lp->nfsl_owner))
 1707                         lp->nfsl_defunct = 1;
 1708         }
 1709         NFSUNLOCKCLSTATE();
 1710         NFSPROCLISTUNLOCK();
 1711 }
 1712 #endif  /* APPLEKEXT || __FreeBSD__ */
 1713 
 1714 /*
 1715  * Called from nfs umount to free up the clientid.
 1716  */
 1717 APPLESTATIC void
 1718 nfscl_umount(struct nfsmount *nmp, NFSPROC_T *p)
 1719 {
 1720         struct nfsclclient *clp;
 1721         struct ucred *cred;
 1722         int igotlock;
 1723 
 1724         clp = nmp->nm_clp;
 1725         if (clp != NULL) {
 1726                 if ((clp->nfsc_flags & NFSCLFLAGS_INITED) == 0)
 1727                         panic("nfscl umount");
 1728         
 1729                 /*
 1730                  * First, handshake with the nfscl renew thread, to terminate
 1731                  * it.
 1732                  */
 1733                 clp->nfsc_flags |= NFSCLFLAGS_UMOUNT;
 1734                 while (clp->nfsc_flags & NFSCLFLAGS_HASTHREAD)
 1735                         (void) tsleep((caddr_t)clp, PWAIT, "nfsclumnt", hz);
 1736         
 1737                 NFSLOCKCLSTATE();
 1738                 do {
 1739                         igotlock = nfsv4_lock(&clp->nfsc_lock, 1, NULL,
 1740                             NFSCLSTATEMUTEXPTR);
 1741                 } while (!igotlock);
 1742                 NFSUNLOCKCLSTATE();
 1743         
 1744                 /*
 1745                  * Free up all the state. It will expire on the server, but
 1746                  * maybe we should do a SetClientId/SetClientIdConfirm so
 1747                  * the server throws it away?
 1748                  */
 1749                 LIST_REMOVE(clp, nfsc_list);
 1750                 nfscl_delegreturnall(clp, p);
 1751                 cred = newnfs_getcred();
 1752                 (void) nfsrpc_setclient(nmp, clp, cred, p);
 1753                 nfscl_cleanclient(clp);
 1754                 nmp->nm_clp = NULL;
 1755                 NFSFREECRED(cred);
 1756                 FREE((caddr_t)clp, M_NFSCLCLIENT);
 1757         }
 1758 
 1759 }
 1760 
 1761 /*
 1762  * This function is called when a server replies with NFSERR_STALECLIENTID
 1763  * or NFSERR_STALESTATEID. It traverses the clientid lists, doing Opens
 1764  * and Locks with reclaim. If these fail, it deletes the corresponding state.
 1765  */
 1766 static void
 1767 nfscl_recover(struct nfsclclient *clp, struct ucred *cred, NFSPROC_T *p)
 1768 {
 1769         struct nfsclowner *owp, *nowp;
 1770         struct nfsclopen *op, *nop;
 1771         struct nfscllockowner *lp, *nlp;
 1772         struct nfscllock *lop, *nlop;
 1773         struct nfscldeleg *dp, *ndp, *tdp;
 1774         struct nfsmount *nmp;
 1775         struct ucred *tcred;
 1776         struct nfsclopenhead extra_open;
 1777         struct nfscldeleghead extra_deleg;
 1778         struct nfsreq *rep;
 1779         u_int64_t len;
 1780         u_int32_t delegtype = NFSV4OPEN_DELEGATEWRITE, mode;
 1781         int igotlock = 0, error, trycnt, firstlock, s;
 1782 
 1783         /*
 1784          * First, lock the client structure, so everyone else will
 1785          * block when trying to use state.
 1786          */
 1787         NFSLOCKCLSTATE();
 1788         clp->nfsc_flags |= NFSCLFLAGS_RECVRINPROG;
 1789         do {
 1790                 igotlock = nfsv4_lock(&clp->nfsc_lock, 1, NULL,
 1791                     NFSCLSTATEMUTEXPTR);
 1792         } while (!igotlock);
 1793         NFSUNLOCKCLSTATE();
 1794 
 1795         nmp = clp->nfsc_nmp;
 1796         if (nmp == NULL)
 1797                 panic("nfscl recover");
 1798         trycnt = 5;
 1799         do {
 1800                 error = nfsrpc_setclient(nmp, clp, cred, p);
 1801         } while ((error == NFSERR_STALECLIENTID ||
 1802              error == NFSERR_STALEDONTRECOVER) && --trycnt > 0);
 1803         if (error) {
 1804                 nfscl_cleanclient(clp);
 1805                 NFSLOCKCLSTATE();
 1806                 clp->nfsc_flags &= ~(NFSCLFLAGS_HASCLIENTID |
 1807                     NFSCLFLAGS_RECOVER | NFSCLFLAGS_RECVRINPROG);
 1808                 wakeup(&clp->nfsc_flags);
 1809                 nfsv4_unlock(&clp->nfsc_lock, 0);
 1810                 NFSUNLOCKCLSTATE();
 1811                 return;
 1812         }
 1813         clp->nfsc_flags |= NFSCLFLAGS_HASCLIENTID;
 1814         clp->nfsc_flags &= ~NFSCLFLAGS_RECOVER;
 1815 
 1816         /*
 1817          * Mark requests already queued on the server, so that they don't
 1818          * initiate another recovery cycle. Any requests already in the
 1819          * queue that handle state information will have the old stale
 1820          * clientid/stateid and will get a NFSERR_STALESTATEID or
 1821          * NFSERR_STALECLIENTID reply from the server. This will be
 1822          * translated to NFSERR_STALEDONTRECOVER when R_DONTRECOVER is set.
 1823          */
 1824         s = splsoftclock();
 1825         NFSLOCKREQ();
 1826         TAILQ_FOREACH(rep, &nfsd_reqq, r_chain) {
 1827                 if (rep->r_nmp == nmp)
 1828                         rep->r_flags |= R_DONTRECOVER;
 1829         }
 1830         NFSUNLOCKREQ();
 1831         splx(s);
 1832 
 1833         /* get rid of defunct lockowners */
 1834         LIST_FOREACH_SAFE(lp, &clp->nfsc_defunctlockowner, nfsl_list, nlp) {
 1835                 nfscl_freelockowner(lp, 0);
 1836         }
 1837 
 1838         /*
 1839          * Now, mark all delegations "need reclaim".
 1840          */
 1841         TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list)
 1842                 dp->nfsdl_flags |= NFSCLDL_NEEDRECLAIM;
 1843 
 1844         TAILQ_INIT(&extra_deleg);
 1845         LIST_INIT(&extra_open);
 1846         /*
 1847          * Now traverse the state lists, doing Open and Lock Reclaims.
 1848          */
 1849         tcred = newnfs_getcred();
 1850         owp = LIST_FIRST(&clp->nfsc_owner);
 1851         while (owp != NULL) {
 1852             nowp = LIST_NEXT(owp, nfsow_list);
 1853             owp->nfsow_seqid = 0;
 1854             op = LIST_FIRST(&owp->nfsow_open);
 1855             while (op != NULL) {
 1856                 nop = LIST_NEXT(op, nfso_list);
 1857                 if (error != NFSERR_NOGRACE) {
 1858                     /* Search for a delegation to reclaim with the open */
 1859                     TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
 1860                         if (!(dp->nfsdl_flags & NFSCLDL_NEEDRECLAIM))
 1861                             continue;
 1862                         if ((dp->nfsdl_flags & NFSCLDL_WRITE)) {
 1863                             mode = NFSV4OPEN_ACCESSWRITE;
 1864                             delegtype = NFSV4OPEN_DELEGATEWRITE;
 1865                         } else {
 1866                             mode = NFSV4OPEN_ACCESSREAD;
 1867                             delegtype = NFSV4OPEN_DELEGATEREAD;
 1868                         }
 1869                         if ((op->nfso_mode & mode) == mode &&
 1870                             op->nfso_fhlen == dp->nfsdl_fhlen &&
 1871                             !NFSBCMP(op->nfso_fh, dp->nfsdl_fh, op->nfso_fhlen))
 1872                             break;
 1873                     }
 1874                     ndp = dp;
 1875                     if (dp == NULL)
 1876                         delegtype = NFSV4OPEN_DELEGATENONE;
 1877                     newnfs_copycred(&op->nfso_cred, tcred);
 1878                     error = nfscl_tryopen(nmp, NULL, op->nfso_fh,
 1879                         op->nfso_fhlen, op->nfso_fh, op->nfso_fhlen,
 1880                         op->nfso_mode, op, NULL, 0, &ndp, 1, delegtype,
 1881                         tcred, p);
 1882                     if (!error) {
 1883                         /* Handle any replied delegation */
 1884                         if (ndp != NULL && ((ndp->nfsdl_flags & NFSCLDL_WRITE)
 1885                             || NFSMNT_RDONLY(nmp->nm_mountp))) {
 1886                             if ((ndp->nfsdl_flags & NFSCLDL_WRITE))
 1887                                 mode = NFSV4OPEN_ACCESSWRITE;
 1888                             else
 1889                                 mode = NFSV4OPEN_ACCESSREAD;
 1890                             TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
 1891                                 if (!(dp->nfsdl_flags & NFSCLDL_NEEDRECLAIM))
 1892                                     continue;
 1893                                 if ((op->nfso_mode & mode) == mode &&
 1894                                     op->nfso_fhlen == dp->nfsdl_fhlen &&
 1895                                     !NFSBCMP(op->nfso_fh, dp->nfsdl_fh,
 1896                                     op->nfso_fhlen)) {
 1897                                     dp->nfsdl_stateid = ndp->nfsdl_stateid;
 1898                                     dp->nfsdl_sizelimit = ndp->nfsdl_sizelimit;
 1899                                     dp->nfsdl_ace = ndp->nfsdl_ace;
 1900                                     dp->nfsdl_change = ndp->nfsdl_change;
 1901                                     dp->nfsdl_flags &= ~NFSCLDL_NEEDRECLAIM;
 1902                                     if ((ndp->nfsdl_flags & NFSCLDL_RECALL))
 1903                                         dp->nfsdl_flags |= NFSCLDL_RECALL;
 1904                                     FREE((caddr_t)ndp, M_NFSCLDELEG);
 1905                                     ndp = NULL;
 1906                                     break;
 1907                                 }
 1908                             }
 1909                         }
 1910                         if (ndp != NULL)
 1911                             TAILQ_INSERT_HEAD(&extra_deleg, ndp, nfsdl_list);
 1912 
 1913                         /* and reclaim all byte range locks */
 1914                         lp = LIST_FIRST(&op->nfso_lock);
 1915                         while (lp != NULL) {
 1916                             nlp = LIST_NEXT(lp, nfsl_list);
 1917                             lp->nfsl_seqid = 0;
 1918                             firstlock = 1;
 1919                             lop = LIST_FIRST(&lp->nfsl_lock);
 1920                             while (lop != NULL) {
 1921                                 nlop = LIST_NEXT(lop, nfslo_list);
 1922                                 if (lop->nfslo_end == NFS64BITSSET)
 1923                                     len = NFS64BITSSET;
 1924                                 else
 1925                                     len = lop->nfslo_end - lop->nfslo_first;
 1926                                 if (error != NFSERR_NOGRACE)
 1927                                     error = nfscl_trylock(nmp, NULL,
 1928                                         op->nfso_fh, op->nfso_fhlen, lp,
 1929                                         firstlock, 1, lop->nfslo_first, len,
 1930                                         lop->nfslo_type, tcred, p);
 1931                                 if (error != 0)
 1932                                     nfscl_freelock(lop, 0);
 1933                                 else
 1934                                     firstlock = 0;
 1935                                 lop = nlop;
 1936                             }
 1937                             /* If no locks, but a lockowner, just delete it. */
 1938                             if (LIST_EMPTY(&lp->nfsl_lock))
 1939                                 nfscl_freelockowner(lp, 0);
 1940                             lp = nlp;
 1941                         }
 1942                     } else {
 1943                         nfscl_freeopen(op, 0);
 1944                     }
 1945                 }
 1946                 op = nop;
 1947             }
 1948             owp = nowp;
 1949         }
 1950 
 1951         /*
 1952          * Now, try and get any delegations not yet reclaimed by cobbling
 1953          * to-gether an appropriate open.
 1954          */
 1955         nowp = NULL;
 1956         dp = TAILQ_FIRST(&clp->nfsc_deleg);
 1957         while (dp != NULL) {
 1958             ndp = TAILQ_NEXT(dp, nfsdl_list);
 1959             if ((dp->nfsdl_flags & NFSCLDL_NEEDRECLAIM)) {
 1960                 if (nowp == NULL) {
 1961                     MALLOC(nowp, struct nfsclowner *,
 1962                         sizeof (struct nfsclowner), M_NFSCLOWNER, M_WAITOK);
 1963                     /*
 1964                      * Name must be as long an largest possible
 1965                      * NFSV4CL_LOCKNAMELEN. 12 for now.
 1966                      */
 1967                     NFSBCOPY("RECLAIMDELEG", nowp->nfsow_owner,
 1968                         NFSV4CL_LOCKNAMELEN);
 1969                     LIST_INIT(&nowp->nfsow_open);
 1970                     nowp->nfsow_clp = clp;
 1971                     nowp->nfsow_seqid = 0;
 1972                     nowp->nfsow_defunct = 0;
 1973                     nfscl_lockinit(&nowp->nfsow_rwlock);
 1974                 }
 1975                 nop = NULL;
 1976                 if (error != NFSERR_NOGRACE) {
 1977                     MALLOC(nop, struct nfsclopen *, sizeof (struct nfsclopen) +
 1978                         dp->nfsdl_fhlen - 1, M_NFSCLOPEN, M_WAITOK);
 1979                     nop->nfso_own = nowp;
 1980                     if ((dp->nfsdl_flags & NFSCLDL_WRITE)) {
 1981                         nop->nfso_mode = NFSV4OPEN_ACCESSWRITE;
 1982                         delegtype = NFSV4OPEN_DELEGATEWRITE;
 1983                     } else {
 1984                         nop->nfso_mode = NFSV4OPEN_ACCESSREAD;
 1985                         delegtype = NFSV4OPEN_DELEGATEREAD;
 1986                     }
 1987                     nop->nfso_opencnt = 0;
 1988                     nop->nfso_posixlock = 1;
 1989                     nop->nfso_fhlen = dp->nfsdl_fhlen;
 1990                     NFSBCOPY(dp->nfsdl_fh, nop->nfso_fh, dp->nfsdl_fhlen);
 1991                     LIST_INIT(&nop->nfso_lock);
 1992                     nop->nfso_stateid.seqid = 0;
 1993                     nop->nfso_stateid.other[0] = 0;
 1994                     nop->nfso_stateid.other[1] = 0;
 1995                     nop->nfso_stateid.other[2] = 0;
 1996                     newnfs_copycred(&dp->nfsdl_cred, tcred);
 1997                     newnfs_copyincred(tcred, &nop->nfso_cred);
 1998                     tdp = NULL;
 1999                     error = nfscl_tryopen(nmp, NULL, nop->nfso_fh,
 2000                         nop->nfso_fhlen, nop->nfso_fh, nop->nfso_fhlen,
 2001                         nop->nfso_mode, nop, NULL, 0, &tdp, 1,
 2002                         delegtype, tcred, p);
 2003                     if (tdp != NULL) {
 2004                         if ((tdp->nfsdl_flags & NFSCLDL_WRITE))
 2005                             mode = NFSV4OPEN_ACCESSWRITE;
 2006                         else
 2007                             mode = NFSV4OPEN_ACCESSREAD;
 2008                         if ((nop->nfso_mode & mode) == mode &&
 2009                             nop->nfso_fhlen == tdp->nfsdl_fhlen &&
 2010                             !NFSBCMP(nop->nfso_fh, tdp->nfsdl_fh,
 2011                             nop->nfso_fhlen)) {
 2012                             dp->nfsdl_stateid = tdp->nfsdl_stateid;
 2013                             dp->nfsdl_sizelimit = tdp->nfsdl_sizelimit;
 2014                             dp->nfsdl_ace = tdp->nfsdl_ace;
 2015                             dp->nfsdl_change = tdp->nfsdl_change;
 2016                             dp->nfsdl_flags &= ~NFSCLDL_NEEDRECLAIM;
 2017                             if ((tdp->nfsdl_flags & NFSCLDL_RECALL))
 2018                                 dp->nfsdl_flags |= NFSCLDL_RECALL;
 2019                             FREE((caddr_t)tdp, M_NFSCLDELEG);
 2020                         } else {
 2021                             TAILQ_INSERT_HEAD(&extra_deleg, tdp, nfsdl_list);
 2022                         }
 2023                     }
 2024                 }
 2025                 if (error) {
 2026                     if (nop != NULL)
 2027                         FREE((caddr_t)nop, M_NFSCLOPEN);
 2028                     /*
 2029                      * Couldn't reclaim it, so throw the state
 2030                      * away. Ouch!!
 2031                      */
 2032                     nfscl_cleandeleg(dp);
 2033                     nfscl_freedeleg(&clp->nfsc_deleg, dp);
 2034                 } else {
 2035                     LIST_INSERT_HEAD(&extra_open, nop, nfso_list);
 2036                 }
 2037             }
 2038             dp = ndp;
 2039         }
 2040 
 2041         /*
 2042          * Now, get rid of extra Opens and Delegations.
 2043          */
 2044         LIST_FOREACH_SAFE(op, &extra_open, nfso_list, nop) {
 2045                 do {
 2046                         newnfs_copycred(&op->nfso_cred, tcred);
 2047                         error = nfscl_tryclose(op, tcred, nmp, p);
 2048                         if (error == NFSERR_GRACE)
 2049                                 (void) nfs_catnap(PZERO, error, "nfsexcls");
 2050                 } while (error == NFSERR_GRACE);
 2051                 LIST_REMOVE(op, nfso_list);
 2052                 FREE((caddr_t)op, M_NFSCLOPEN);
 2053         }
 2054         if (nowp != NULL)
 2055                 FREE((caddr_t)nowp, M_NFSCLOWNER);
 2056 
 2057         TAILQ_FOREACH_SAFE(dp, &extra_deleg, nfsdl_list, ndp) {
 2058                 do {
 2059                         newnfs_copycred(&dp->nfsdl_cred, tcred);
 2060                         error = nfscl_trydelegreturn(dp, tcred, nmp, p);
 2061                         if (error == NFSERR_GRACE)
 2062                                 (void) nfs_catnap(PZERO, error, "nfsexdlg");
 2063                 } while (error == NFSERR_GRACE);
 2064                 TAILQ_REMOVE(&extra_deleg, dp, nfsdl_list);
 2065                 FREE((caddr_t)dp, M_NFSCLDELEG);
 2066         }
 2067 
 2068         NFSLOCKCLSTATE();
 2069         clp->nfsc_flags &= ~NFSCLFLAGS_RECVRINPROG;
 2070         wakeup(&clp->nfsc_flags);
 2071         nfsv4_unlock(&clp->nfsc_lock, 0);
 2072         NFSUNLOCKCLSTATE();
 2073         NFSFREECRED(tcred);
 2074 }
 2075 
 2076 /*
 2077  * This function is called when a server replies with NFSERR_EXPIRED.
 2078  * It deletes all state for the client and does a fresh SetClientId/confirm.
 2079  * XXX Someday it should post a signal to the process(es) that hold the
 2080  * state, so they know that lock state has been lost.
 2081  */
 2082 APPLESTATIC int
 2083 nfscl_hasexpired(struct nfsclclient *clp, u_int32_t clidrev, NFSPROC_T *p)
 2084 {
 2085         struct nfscllockowner *lp, *nlp;
 2086         struct nfsmount *nmp;
 2087         struct ucred *cred;
 2088         int igotlock = 0, error, trycnt;
 2089 
 2090         /*
 2091          * If the clientid has gone away or a new SetClientid has already
 2092          * been done, just return ok.
 2093          */
 2094         if (clp == NULL || clidrev != clp->nfsc_clientidrev)
 2095                 return (0);
 2096 
 2097         /*
 2098          * First, lock the client structure, so everyone else will
 2099          * block when trying to use state. Also, use NFSCLFLAGS_EXPIREIT so
 2100          * that only one thread does the work.
 2101          */
 2102         NFSLOCKCLSTATE();
 2103         clp->nfsc_flags |= NFSCLFLAGS_EXPIREIT;
 2104         do {
 2105                 igotlock = nfsv4_lock(&clp->nfsc_lock, 1, NULL,
 2106                     NFSCLSTATEMUTEXPTR);
 2107         } while (!igotlock && (clp->nfsc_flags & NFSCLFLAGS_EXPIREIT));
 2108         if ((clp->nfsc_flags & NFSCLFLAGS_EXPIREIT) == 0) {
 2109                 if (igotlock)
 2110                         nfsv4_unlock(&clp->nfsc_lock, 0);
 2111                 NFSUNLOCKCLSTATE();
 2112                 return (0);
 2113         }
 2114         clp->nfsc_flags |= NFSCLFLAGS_RECVRINPROG;
 2115         NFSUNLOCKCLSTATE();
 2116 
 2117         nmp = clp->nfsc_nmp;
 2118         if (nmp == NULL)
 2119                 panic("nfscl expired");
 2120         cred = newnfs_getcred();
 2121         trycnt = 5;
 2122         do {
 2123                 error = nfsrpc_setclient(nmp, clp, cred, p);
 2124         } while ((error == NFSERR_STALECLIENTID ||
 2125              error == NFSERR_STALEDONTRECOVER) && --trycnt > 0);
 2126         if (error) {
 2127                 /*
 2128                  * Clear out any state.
 2129                  */
 2130                 nfscl_cleanclient(clp);
 2131                 NFSLOCKCLSTATE();
 2132                 clp->nfsc_flags &= ~(NFSCLFLAGS_HASCLIENTID |
 2133                     NFSCLFLAGS_RECOVER);
 2134         } else {
 2135                 /* get rid of defunct lockowners */
 2136                 LIST_FOREACH_SAFE(lp, &clp->nfsc_defunctlockowner, nfsl_list,
 2137                     nlp) {
 2138                         nfscl_freelockowner(lp, 0);
 2139                 }
 2140 
 2141                 /*
 2142                  * Expire the state for the client.
 2143                  */
 2144                 nfscl_expireclient(clp, nmp, cred, p);
 2145                 NFSLOCKCLSTATE();
 2146                 clp->nfsc_flags |= NFSCLFLAGS_HASCLIENTID;
 2147                 clp->nfsc_flags &= ~NFSCLFLAGS_RECOVER;
 2148         }
 2149         clp->nfsc_flags &= ~(NFSCLFLAGS_EXPIREIT | NFSCLFLAGS_RECVRINPROG);
 2150         wakeup(&clp->nfsc_flags);
 2151         nfsv4_unlock(&clp->nfsc_lock, 0);
 2152         NFSUNLOCKCLSTATE();
 2153         NFSFREECRED(cred);
 2154         return (error);
 2155 }
 2156 
 2157 /*
 2158  * This function inserts a lock in the list after insert_lop.
 2159  */
 2160 static void
 2161 nfscl_insertlock(struct nfscllockowner *lp, struct nfscllock *new_lop,
 2162     struct nfscllock *insert_lop, int local)
 2163 {
 2164 
 2165         if ((struct nfscllockowner *)insert_lop == lp)
 2166                 LIST_INSERT_HEAD(&lp->nfsl_lock, new_lop, nfslo_list);
 2167         else
 2168                 LIST_INSERT_AFTER(insert_lop, new_lop, nfslo_list);
 2169         if (local)
 2170                 newnfsstats.cllocallocks++;
 2171         else
 2172                 newnfsstats.cllocks++;
 2173 }
 2174 
 2175 /*
 2176  * This function updates the locking for a lock owner and given file. It
 2177  * maintains a list of lock ranges ordered on increasing file offset that
 2178  * are NFSCLLOCK_READ or NFSCLLOCK_WRITE and non-overlapping (aka POSIX style).
 2179  * It always adds new_lop to the list and sometimes uses the one pointed
 2180  * at by other_lopp.
 2181  * Returns 1 if the locks were modified, 0 otherwise.
 2182  */
 2183 static int
 2184 nfscl_updatelock(struct nfscllockowner *lp, struct nfscllock **new_lopp,
 2185     struct nfscllock **other_lopp, int local)
 2186 {
 2187         struct nfscllock *new_lop = *new_lopp;
 2188         struct nfscllock *lop, *tlop, *ilop;
 2189         struct nfscllock *other_lop;
 2190         int unlock = 0, modified = 0;
 2191         u_int64_t tmp;
 2192 
 2193         /*
 2194          * Work down the list until the lock is merged.
 2195          */
 2196         if (new_lop->nfslo_type == F_UNLCK)
 2197                 unlock = 1;
 2198         ilop = (struct nfscllock *)lp;
 2199         lop = LIST_FIRST(&lp->nfsl_lock);
 2200         while (lop != NULL) {
 2201             /*
 2202              * Only check locks for this file that aren't before the start of
 2203              * new lock's range.
 2204              */
 2205             if (lop->nfslo_end >= new_lop->nfslo_first) {
 2206                 if (new_lop->nfslo_end < lop->nfslo_first) {
 2207                     /*
 2208                      * If the new lock ends before the start of the
 2209                      * current lock's range, no merge, just insert
 2210                      * the new lock.
 2211                      */
 2212                     break;
 2213                 }
 2214                 if (new_lop->nfslo_type == lop->nfslo_type ||
 2215                     (new_lop->nfslo_first <= lop->nfslo_first &&
 2216                      new_lop->nfslo_end >= lop->nfslo_end)) {
 2217                     /*
 2218                      * This lock can be absorbed by the new lock/unlock.
 2219                      * This happens when it covers the entire range
 2220                      * of the old lock or is contiguous
 2221                      * with the old lock and is of the same type or an
 2222                      * unlock.
 2223                      */
 2224                     if (new_lop->nfslo_type != lop->nfslo_type ||
 2225                         new_lop->nfslo_first != lop->nfslo_first ||
 2226                         new_lop->nfslo_end != lop->nfslo_end)
 2227                         modified = 1;
 2228                     if (lop->nfslo_first < new_lop->nfslo_first)
 2229                         new_lop->nfslo_first = lop->nfslo_first;
 2230                     if (lop->nfslo_end > new_lop->nfslo_end)
 2231                         new_lop->nfslo_end = lop->nfslo_end;
 2232                     tlop = lop;
 2233                     lop = LIST_NEXT(lop, nfslo_list);
 2234                     nfscl_freelock(tlop, local);
 2235                     continue;
 2236                 }
 2237 
 2238                 /*
 2239                  * All these cases are for contiguous locks that are not the
 2240                  * same type, so they can't be merged.
 2241                  */
 2242                 if (new_lop->nfslo_first <= lop->nfslo_first) {
 2243                     /*
 2244                      * This case is where the new lock overlaps with the
 2245                      * first part of the old lock. Move the start of the
 2246                      * old lock to just past the end of the new lock. The
 2247                      * new lock will be inserted in front of the old, since
 2248                      * ilop hasn't been updated. (We are done now.)
 2249                      */
 2250                     if (lop->nfslo_first != new_lop->nfslo_end) {
 2251                         lop->nfslo_first = new_lop->nfslo_end;
 2252                         modified = 1;
 2253                     }
 2254                     break;
 2255                 }
 2256                 if (new_lop->nfslo_end >= lop->nfslo_end) {
 2257                     /*
 2258                      * This case is where the new lock overlaps with the
 2259                      * end of the old lock's range. Move the old lock's
 2260                      * end to just before the new lock's first and insert
 2261                      * the new lock after the old lock.
 2262                      * Might not be done yet, since the new lock could
 2263                      * overlap further locks with higher ranges.
 2264                      */
 2265                     if (lop->nfslo_end != new_lop->nfslo_first) {
 2266                         lop->nfslo_end = new_lop->nfslo_first;
 2267                         modified = 1;
 2268                     }
 2269                     ilop = lop;
 2270                     lop = LIST_NEXT(lop, nfslo_list);
 2271                     continue;
 2272                 }
 2273                 /*
 2274                  * The final case is where the new lock's range is in the
 2275                  * middle of the current lock's and splits the current lock
 2276                  * up. Use *other_lopp to handle the second part of the
 2277                  * split old lock range. (We are done now.)
 2278                  * For unlock, we use new_lop as other_lop and tmp, since
 2279                  * other_lop and new_lop are the same for this case.
 2280                  * We noted the unlock case above, so we don't need
 2281                  * new_lop->nfslo_type any longer.
 2282                  */
 2283                 tmp = new_lop->nfslo_first;
 2284                 if (unlock) {
 2285                     other_lop = new_lop;
 2286                     *new_lopp = NULL;
 2287                 } else {
 2288                     other_lop = *other_lopp;
 2289                     *other_lopp = NULL;
 2290                 }
 2291                 other_lop->nfslo_first = new_lop->nfslo_end;
 2292                 other_lop->nfslo_end = lop->nfslo_end;
 2293                 other_lop->nfslo_type = lop->nfslo_type;
 2294                 lop->nfslo_end = tmp;
 2295                 nfscl_insertlock(lp, other_lop, lop, local);
 2296                 ilop = lop;
 2297                 modified = 1;
 2298                 break;
 2299             }
 2300             ilop = lop;
 2301             lop = LIST_NEXT(lop, nfslo_list);
 2302             if (lop == NULL)
 2303                 break;
 2304         }
 2305 
 2306         /*
 2307          * Insert the new lock in the list at the appropriate place.
 2308          */
 2309         if (!unlock) {
 2310                 nfscl_insertlock(lp, new_lop, ilop, local);
 2311                 *new_lopp = NULL;
 2312                 modified = 1;
 2313         }
 2314         return (modified);
 2315 }
 2316 
 2317 /*
 2318  * This function must be run as a kernel thread.
 2319  * It does Renew Ops and recovery, when required.
 2320  */
 2321 APPLESTATIC void
 2322 nfscl_renewthread(struct nfsclclient *clp, NFSPROC_T *p)
 2323 {
 2324         struct nfsclowner *owp, *nowp;
 2325         struct nfsclopen *op;
 2326         struct nfscllockowner *lp, *nlp, *olp;
 2327         struct nfscldeleghead dh;
 2328         struct nfscllockownerhead lh;
 2329         struct nfscldeleg *dp, *ndp;
 2330         struct ucred *cred;
 2331         u_int32_t clidrev;
 2332         int error, cbpathdown, islept, igotlock, ret, clearok;
 2333         uint32_t recover_done_time = 0;
 2334 
 2335         cred = newnfs_getcred();
 2336         NFSLOCKCLSTATE();
 2337         clp->nfsc_flags |= NFSCLFLAGS_HASTHREAD;
 2338         NFSUNLOCKCLSTATE();
 2339         for(;;) {
 2340                 newnfs_setroot(cred);
 2341                 cbpathdown = 0;
 2342                 if (clp->nfsc_flags & NFSCLFLAGS_RECOVER) {
 2343                         /*
 2344                          * Only allow one recover within 1/2 of the lease
 2345                          * duration (nfsc_renew).
 2346                          */
 2347                         if (recover_done_time < NFSD_MONOSEC) {
 2348                                 recover_done_time = NFSD_MONOSEC +
 2349                                     clp->nfsc_renew;
 2350                                 nfscl_recover(clp, cred, p);
 2351                         } else {
 2352                                 NFSLOCKCLSTATE();
 2353                                 clp->nfsc_flags &= ~NFSCLFLAGS_RECOVER;
 2354                                 NFSUNLOCKCLSTATE();
 2355                         }
 2356                 }
 2357                 if (clp->nfsc_expire <= NFSD_MONOSEC &&
 2358                     (clp->nfsc_flags & NFSCLFLAGS_HASCLIENTID)) {
 2359                         clp->nfsc_expire = NFSD_MONOSEC + clp->nfsc_renew;
 2360                         clidrev = clp->nfsc_clientidrev;
 2361                         error = nfsrpc_renew(clp, cred, p);
 2362                         if (error == NFSERR_CBPATHDOWN)
 2363                             cbpathdown = 1;
 2364                         else if (error == NFSERR_STALECLIENTID) {
 2365                             NFSLOCKCLSTATE();
 2366                             clp->nfsc_flags |= NFSCLFLAGS_RECOVER;
 2367                             NFSUNLOCKCLSTATE();
 2368                         } else if (error == NFSERR_EXPIRED)
 2369                             (void) nfscl_hasexpired(clp, clidrev, p);
 2370                 }
 2371 
 2372                 LIST_INIT(&lh);
 2373                 TAILQ_INIT(&dh);
 2374                 NFSLOCKCLSTATE();
 2375                 if (cbpathdown)
 2376                         /* It's a Total Recall! */
 2377                         nfscl_totalrecall(clp);
 2378 
 2379                 /*
 2380                  * Now, handle defunct owners.
 2381                  */
 2382                 owp = LIST_FIRST(&clp->nfsc_owner);
 2383                 while (owp != NULL) {
 2384                     nowp = LIST_NEXT(owp, nfsow_list);
 2385                     if (LIST_EMPTY(&owp->nfsow_open)) {
 2386                         if (owp->nfsow_defunct)
 2387                             nfscl_freeopenowner(owp, 0);
 2388                     } else {
 2389                         LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 2390                             lp = LIST_FIRST(&op->nfso_lock);
 2391                             while (lp != NULL) {
 2392                                 nlp = LIST_NEXT(lp, nfsl_list);
 2393                                 if (lp->nfsl_defunct &&
 2394                                     LIST_EMPTY(&lp->nfsl_lock)) {
 2395                                     LIST_FOREACH(olp, &lh, nfsl_list) {
 2396                                         if (!NFSBCMP(olp->nfsl_owner,
 2397                                             lp->nfsl_owner,NFSV4CL_LOCKNAMELEN))
 2398                                             break;
 2399                                     }
 2400                                     if (olp == NULL) {
 2401                                         LIST_REMOVE(lp, nfsl_list);
 2402                                         LIST_INSERT_HEAD(&lh, lp, nfsl_list);
 2403                                     } else {
 2404                                         nfscl_freelockowner(lp, 0);
 2405                                     }
 2406                                 }
 2407                                 lp = nlp;
 2408                             }
 2409                         }
 2410                     }
 2411                     owp = nowp;
 2412                 }
 2413 
 2414                 /* also search the defunct list */
 2415                 lp = LIST_FIRST(&clp->nfsc_defunctlockowner);
 2416                 while (lp != NULL) {
 2417                     nlp = LIST_NEXT(lp, nfsl_list);
 2418                     if (lp->nfsl_defunct) {
 2419                         LIST_FOREACH(olp, &lh, nfsl_list) {
 2420                             if (!NFSBCMP(olp->nfsl_owner, lp->nfsl_owner,
 2421                                 NFSV4CL_LOCKNAMELEN))
 2422                                 break;
 2423                         }
 2424                         if (olp == NULL) {
 2425                             LIST_REMOVE(lp, nfsl_list);
 2426                             LIST_INSERT_HEAD(&lh, lp, nfsl_list);
 2427                         } else {
 2428                             nfscl_freelockowner(lp, 0);
 2429                         }
 2430                     }
 2431                     lp = nlp;
 2432                 }
 2433                 /* and release defunct lock owners */
 2434                 LIST_FOREACH_SAFE(lp, &lh, nfsl_list, nlp) {
 2435                     nfscl_freelockowner(lp, 0);
 2436                 }
 2437 
 2438                 /*
 2439                  * Do the recall on any delegations. To avoid trouble, always
 2440                  * come back up here after having slept.
 2441                  */
 2442                 igotlock = 0;
 2443 tryagain:
 2444                 dp = TAILQ_FIRST(&clp->nfsc_deleg);
 2445                 while (dp != NULL) {
 2446                         ndp = TAILQ_NEXT(dp, nfsdl_list);
 2447                         if ((dp->nfsdl_flags & NFSCLDL_RECALL)) {
 2448                                 /*
 2449                                  * Wait for outstanding I/O ops to be done.
 2450                                  */
 2451                                 if (dp->nfsdl_rwlock.nfslock_usecnt > 0) {
 2452                                     if (igotlock) {
 2453                                         nfsv4_unlock(&clp->nfsc_lock, 0);
 2454                                         igotlock = 0;
 2455                                     }
 2456                                     dp->nfsdl_rwlock.nfslock_lock |=
 2457                                         NFSV4LOCK_WANTED;
 2458                                     (void) nfsmsleep(&dp->nfsdl_rwlock,
 2459                                         NFSCLSTATEMUTEXPTR, PZERO, "nfscld",
 2460                                         NULL);
 2461                                     goto tryagain;
 2462                                 }
 2463                                 while (!igotlock) {
 2464                                     igotlock = nfsv4_lock(&clp->nfsc_lock, 1,
 2465                                         &islept, NFSCLSTATEMUTEXPTR);
 2466                                     if (islept)
 2467                                         goto tryagain;
 2468                                 }
 2469                                 NFSUNLOCKCLSTATE();
 2470                                 newnfs_copycred(&dp->nfsdl_cred, cred);
 2471                                 ret = nfscl_recalldeleg(clp, clp->nfsc_nmp, dp,
 2472                                     NULL, cred, p, 1);
 2473                                 if (!ret) {
 2474                                     nfscl_cleandeleg(dp);
 2475                                     TAILQ_REMOVE(&clp->nfsc_deleg, dp,
 2476                                         nfsdl_list);
 2477                                     LIST_REMOVE(dp, nfsdl_hash);
 2478                                     TAILQ_INSERT_HEAD(&dh, dp, nfsdl_list);
 2479                                     nfscl_delegcnt--;
 2480                                     newnfsstats.cldelegates--;
 2481                                 }
 2482                                 NFSLOCKCLSTATE();
 2483                         }
 2484                         dp = ndp;
 2485                 }
 2486 
 2487                 /*
 2488                  * Clear out old delegations, if we are above the high water
 2489                  * mark. Only clear out ones with no state related to them.
 2490                  * The tailq list is in LRU order.
 2491                  */
 2492                 dp = TAILQ_LAST(&clp->nfsc_deleg, nfscldeleghead);
 2493                 while (nfscl_delegcnt > nfscl_deleghighwater && dp != NULL) {
 2494                     ndp = TAILQ_PREV(dp, nfscldeleghead, nfsdl_list);
 2495                     if (dp->nfsdl_rwlock.nfslock_usecnt == 0 &&
 2496                         dp->nfsdl_rwlock.nfslock_lock == 0 &&
 2497                         dp->nfsdl_timestamp < NFSD_MONOSEC &&
 2498                         !(dp->nfsdl_flags & (NFSCLDL_RECALL | NFSCLDL_ZAPPED |
 2499                           NFSCLDL_NEEDRECLAIM))) {
 2500                         clearok = 1;
 2501                         LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
 2502                             op = LIST_FIRST(&owp->nfsow_open);
 2503                             if (op != NULL) {
 2504                                 clearok = 0;
 2505                                 break;
 2506                             }
 2507                         }
 2508                         if (clearok) {
 2509                             LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
 2510                                 if (!LIST_EMPTY(&lp->nfsl_lock)) {
 2511                                     clearok = 0;
 2512                                     break;
 2513                                 }
 2514                             }
 2515                         }
 2516                         if (clearok) {
 2517                             TAILQ_REMOVE(&clp->nfsc_deleg, dp, nfsdl_list);
 2518                             LIST_REMOVE(dp, nfsdl_hash);
 2519                             TAILQ_INSERT_HEAD(&dh, dp, nfsdl_list);
 2520                             nfscl_delegcnt--;
 2521                             newnfsstats.cldelegates--;
 2522                         }
 2523                     }
 2524                     dp = ndp;
 2525                 }
 2526                 if (igotlock)
 2527                         nfsv4_unlock(&clp->nfsc_lock, 0);
 2528                 NFSUNLOCKCLSTATE();
 2529 
 2530                 /*
 2531                  * Delegreturn any delegations cleaned out or recalled.
 2532                  */
 2533                 TAILQ_FOREACH_SAFE(dp, &dh, nfsdl_list, ndp) {
 2534                         newnfs_copycred(&dp->nfsdl_cred, cred);
 2535                         (void) nfscl_trydelegreturn(dp, cred, clp->nfsc_nmp, p);
 2536                         TAILQ_REMOVE(&dh, dp, nfsdl_list);
 2537                         FREE((caddr_t)dp, M_NFSCLDELEG);
 2538                 }
 2539 
 2540 #if defined(APPLEKEXT) || defined(__FreeBSD__)
 2541                 /*
 2542                  * Simulate the calls to nfscl_cleanup() when a process
 2543                  * exits, since the call can't be patched into exit().
 2544                  */
 2545                 {
 2546                         struct timespec mytime;
 2547                         static time_t prevsec = 0;
 2548 
 2549                         NFSGETNANOTIME(&mytime);
 2550                         if (prevsec != mytime.tv_sec) {
 2551                                 prevsec = mytime.tv_sec;
 2552                                 nfscl_cleanupkext(clp);
 2553                         }
 2554                 }
 2555 #endif  /* APPLEKEXT || __FreeBSD__ */
 2556 
 2557                 if ((clp->nfsc_flags & NFSCLFLAGS_RECOVER) == 0)
 2558                     (void) tsleep((caddr_t)clp, PWAIT, "nfscl", hz);
 2559                 if (clp->nfsc_flags & NFSCLFLAGS_UMOUNT) {
 2560                         NFSFREECRED(cred);
 2561                         clp->nfsc_flags &= ~NFSCLFLAGS_HASTHREAD;
 2562                         wakeup((caddr_t)clp);
 2563                         return;
 2564                 }
 2565         }
 2566 }
 2567 
 2568 /*
 2569  * Initiate state recovery. Called when NFSERR_STALECLIENTID or
 2570  * NFSERR_STALESTATEID is received.
 2571  */
 2572 APPLESTATIC void
 2573 nfscl_initiate_recovery(struct nfsclclient *clp)
 2574 {
 2575 
 2576         if (clp == NULL)
 2577                 return;
 2578         NFSLOCKCLSTATE();
 2579         clp->nfsc_flags |= NFSCLFLAGS_RECOVER;
 2580         NFSUNLOCKCLSTATE();
 2581         wakeup((caddr_t)clp);
 2582 }
 2583 
 2584 /*
 2585  * Dump out the state stuff for debugging.
 2586  */
 2587 APPLESTATIC void
 2588 nfscl_dumpstate(struct nfsmount *nmp, int openowner, int opens,
 2589     int lockowner, int locks)
 2590 {
 2591         struct nfsclclient *clp;
 2592         struct nfsclowner *owp;
 2593         struct nfsclopen *op;
 2594         struct nfscllockowner *lp;
 2595         struct nfscllock *lop;
 2596         struct nfscldeleg *dp;
 2597 
 2598         clp = nmp->nm_clp;
 2599         if (clp == NULL) {
 2600                 printf("nfscl dumpstate NULL clp\n");
 2601                 return;
 2602         }
 2603         NFSLOCKCLSTATE();
 2604         TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
 2605           LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
 2606             if (openowner && !LIST_EMPTY(&owp->nfsow_open))
 2607                 printf("owner=0x%x 0x%x 0x%x 0x%x seqid=%d\n",
 2608                     owp->nfsow_owner[0], owp->nfsow_owner[1],
 2609                     owp->nfsow_owner[2], owp->nfsow_owner[3],
 2610                     owp->nfsow_seqid);
 2611             LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 2612                 if (opens)
 2613                     printf("open st=0x%x 0x%x 0x%x cnt=%d fh12=0x%x\n",
 2614                         op->nfso_stateid.other[0], op->nfso_stateid.other[1],
 2615                         op->nfso_stateid.other[2], op->nfso_opencnt,
 2616                         op->nfso_fh[12]);
 2617                 LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
 2618                     if (lockowner)
 2619                         printf("lckown=0x%x 0x%x 0x%x 0x%x seqid=%d st=0x%x 0x%x 0x%x\n",
 2620                             lp->nfsl_owner[0], lp->nfsl_owner[1],
 2621                             lp->nfsl_owner[2], lp->nfsl_owner[3],
 2622                             lp->nfsl_seqid,
 2623                             lp->nfsl_stateid.other[0], lp->nfsl_stateid.other[1],
 2624                             lp->nfsl_stateid.other[2]);
 2625                     LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
 2626                         if (locks)
 2627 #ifdef __FreeBSD__
 2628                             printf("lck typ=%d fst=%ju end=%ju\n",
 2629                                 lop->nfslo_type, (intmax_t)lop->nfslo_first,
 2630                                 (intmax_t)lop->nfslo_end);
 2631 #else
 2632                             printf("lck typ=%d fst=%qd end=%qd\n",
 2633                                 lop->nfslo_type, lop->nfslo_first,
 2634                                 lop->nfslo_end);
 2635 #endif
 2636                     }
 2637                 }
 2638             }
 2639           }
 2640         }
 2641         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 2642             if (openowner && !LIST_EMPTY(&owp->nfsow_open))
 2643                 printf("owner=0x%x 0x%x 0x%x 0x%x seqid=%d\n",
 2644                     owp->nfsow_owner[0], owp->nfsow_owner[1],
 2645                     owp->nfsow_owner[2], owp->nfsow_owner[3],
 2646                     owp->nfsow_seqid);
 2647             LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 2648                 if (opens)
 2649                     printf("open st=0x%x 0x%x 0x%x cnt=%d fh12=0x%x\n",
 2650                         op->nfso_stateid.other[0], op->nfso_stateid.other[1],
 2651                         op->nfso_stateid.other[2], op->nfso_opencnt,
 2652                         op->nfso_fh[12]);
 2653                 LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
 2654                     if (lockowner)
 2655                         printf("lckown=0x%x 0x%x 0x%x 0x%x seqid=%d st=0x%x 0x%x 0x%x\n",
 2656                             lp->nfsl_owner[0], lp->nfsl_owner[1],
 2657                             lp->nfsl_owner[2], lp->nfsl_owner[3],
 2658                             lp->nfsl_seqid,
 2659                             lp->nfsl_stateid.other[0], lp->nfsl_stateid.other[1],
 2660                             lp->nfsl_stateid.other[2]);
 2661                     LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
 2662                         if (locks)
 2663 #ifdef __FreeBSD__
 2664                             printf("lck typ=%d fst=%ju end=%ju\n",
 2665                                 lop->nfslo_type, (intmax_t)lop->nfslo_first,
 2666                                 (intmax_t)lop->nfslo_end);
 2667 #else
 2668                             printf("lck typ=%d fst=%qd end=%qd\n",
 2669                                 lop->nfslo_type, lop->nfslo_first,
 2670                                 lop->nfslo_end);
 2671 #endif
 2672                     }
 2673                 }
 2674             }
 2675         }
 2676         NFSUNLOCKCLSTATE();
 2677 }
 2678 
 2679 /*
 2680  * Check for duplicate open owners and opens.
 2681  * (Only used as a diagnostic aid.)
 2682  */
 2683 APPLESTATIC void
 2684 nfscl_dupopen(vnode_t vp, int dupopens)
 2685 {
 2686         struct nfsclclient *clp;
 2687         struct nfsclowner *owp, *owp2;
 2688         struct nfsclopen *op, *op2;
 2689         struct nfsfh *nfhp;
 2690 
 2691         clp = VFSTONFS(vnode_mount(vp))->nm_clp;
 2692         if (clp == NULL) {
 2693                 printf("nfscl dupopen NULL clp\n");
 2694                 return;
 2695         }
 2696         nfhp = VTONFS(vp)->n_fhp;
 2697         NFSLOCKCLSTATE();
 2698 
 2699         /*
 2700          * First, search for duplicate owners.
 2701          * These should never happen!
 2702          */
 2703         LIST_FOREACH(owp2, &clp->nfsc_owner, nfsow_list) {
 2704             LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 2705                 if (owp != owp2 &&
 2706                     !NFSBCMP(owp->nfsow_owner, owp2->nfsow_owner,
 2707                     NFSV4CL_LOCKNAMELEN)) {
 2708                         NFSUNLOCKCLSTATE();
 2709                         printf("DUP OWNER\n");
 2710                         nfscl_dumpstate(VFSTONFS(vnode_mount(vp)), 1, 1, 0, 0);
 2711                         return;
 2712                 }
 2713             }
 2714         }
 2715 
 2716         /*
 2717          * Now, search for duplicate stateids.
 2718          * These shouldn't happen, either.
 2719          */
 2720         LIST_FOREACH(owp2, &clp->nfsc_owner, nfsow_list) {
 2721             LIST_FOREACH(op2, &owp2->nfsow_open, nfso_list) {
 2722                 LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 2723                     LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 2724                         if (op != op2 &&
 2725                             (op->nfso_stateid.other[0] != 0 ||
 2726                              op->nfso_stateid.other[1] != 0 ||
 2727                              op->nfso_stateid.other[2] != 0) &&
 2728                             op->nfso_stateid.other[0] == op2->nfso_stateid.other[0] &&
 2729                             op->nfso_stateid.other[1] == op2->nfso_stateid.other[1] &&
 2730                             op->nfso_stateid.other[2] == op2->nfso_stateid.other[2]) {
 2731                             NFSUNLOCKCLSTATE();
 2732                             printf("DUP STATEID\n");
 2733                             nfscl_dumpstate(VFSTONFS(vnode_mount(vp)), 1, 1, 0,
 2734                                 0);
 2735                             return;
 2736                         }
 2737                     }
 2738                 }
 2739             }
 2740         }
 2741 
 2742         /*
 2743          * Now search for duplicate opens.
 2744          * Duplicate opens for the same owner
 2745          * should never occur. Other duplicates are
 2746          * possible and are checked for if "dupopens"
 2747          * is true.
 2748          */
 2749         LIST_FOREACH(owp2, &clp->nfsc_owner, nfsow_list) {
 2750             LIST_FOREACH(op2, &owp2->nfsow_open, nfso_list) {
 2751                 if (nfhp->nfh_len == op2->nfso_fhlen &&
 2752                     !NFSBCMP(nfhp->nfh_fh, op2->nfso_fh, nfhp->nfh_len)) {
 2753                     LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 2754                         LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 2755                             if (op != op2 && nfhp->nfh_len == op->nfso_fhlen &&
 2756                                 !NFSBCMP(nfhp->nfh_fh, op->nfso_fh, nfhp->nfh_len) &&
 2757                                 (!NFSBCMP(op->nfso_own->nfsow_owner,
 2758                                  op2->nfso_own->nfsow_owner, NFSV4CL_LOCKNAMELEN) ||
 2759                                  dupopens)) {
 2760                                 if (!NFSBCMP(op->nfso_own->nfsow_owner,
 2761                                     op2->nfso_own->nfsow_owner, NFSV4CL_LOCKNAMELEN)) {
 2762                                     NFSUNLOCKCLSTATE();
 2763                                     printf("BADDUP OPEN\n");
 2764                                 } else {
 2765                                     NFSUNLOCKCLSTATE();
 2766                                     printf("DUP OPEN\n");
 2767                                 }
 2768                                 nfscl_dumpstate(VFSTONFS(vnode_mount(vp)), 1, 1,
 2769                                     0, 0);
 2770                                 return;
 2771                             }
 2772                         }
 2773                     }
 2774                 }
 2775             }
 2776         }
 2777         NFSUNLOCKCLSTATE();
 2778 }
 2779 
 2780 /*
 2781  * During close, find an open that needs to be dereferenced and
 2782  * dereference it. If there are no more opens for this file,
 2783  * log a message to that effect.
 2784  * Opens aren't actually Close'd until VOP_INACTIVE() is performed
 2785  * on the file's vnode.
 2786  * This is the safe way, since it is difficult to identify
 2787  * which open the close is for and I/O can be performed after the
 2788  * close(2) system call when a file is mmap'd.
 2789  * If it returns 0 for success, there will be a referenced
 2790  * clp returned via clpp.
 2791  */
 2792 APPLESTATIC int
 2793 nfscl_getclose(vnode_t vp, struct nfsclclient **clpp)
 2794 {
 2795         struct nfsclclient *clp;
 2796         struct nfsclowner *owp;
 2797         struct nfsclopen *op;
 2798         struct nfscldeleg *dp;
 2799         struct nfsfh *nfhp;
 2800         int error, notdecr;
 2801 
 2802         error = nfscl_getcl(vp, NULL, NULL, &clp);
 2803         if (error)
 2804                 return (error);
 2805         *clpp = clp;
 2806 
 2807         nfhp = VTONFS(vp)->n_fhp;
 2808         notdecr = 1;
 2809         NFSLOCKCLSTATE();
 2810         /*
 2811          * First, look for one under a delegation that was locally issued
 2812          * and just decrement the opencnt for it. Since all my Opens against
 2813          * the server are DENY_NONE, I don't see a problem with hanging
 2814          * onto them. (It is much easier to use one of the extant Opens
 2815          * that I already have on the server when a Delegation is recalled
 2816          * than to do fresh Opens.) Someday, I might need to rethink this, but.
 2817          */
 2818         dp = nfscl_finddeleg(clp, nfhp->nfh_fh, nfhp->nfh_len);
 2819         if (dp != NULL) {
 2820                 LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
 2821                         op = LIST_FIRST(&owp->nfsow_open);
 2822                         if (op != NULL) {
 2823                                 /*
 2824                                  * Since a delegation is for a file, there
 2825                                  * should never be more than one open for
 2826                                  * each openowner.
 2827                                  */
 2828                                 if (LIST_NEXT(op, nfso_list) != NULL)
 2829                                         panic("nfscdeleg opens");
 2830                                 if (notdecr && op->nfso_opencnt > 0) {
 2831                                         notdecr = 0;
 2832                                         op->nfso_opencnt--;
 2833                                         break;
 2834                                 }
 2835                         }
 2836                 }
 2837         }
 2838 
 2839         /* Now process the opens against the server. */
 2840         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 2841                 LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 2842                         if (op->nfso_fhlen == nfhp->nfh_len &&
 2843                             !NFSBCMP(op->nfso_fh, nfhp->nfh_fh,
 2844                             nfhp->nfh_len)) {
 2845                                 /* Found an open, decrement cnt if possible */
 2846                                 if (notdecr && op->nfso_opencnt > 0) {
 2847                                         notdecr = 0;
 2848                                         op->nfso_opencnt--;
 2849                                 }
 2850                                 /*
 2851                                  * There are more opens, so just return.
 2852                                  */
 2853                                 if (op->nfso_opencnt > 0) {
 2854                                         NFSUNLOCKCLSTATE();
 2855                                         return (0);
 2856                                 }
 2857                         }
 2858                 }
 2859         }
 2860         NFSUNLOCKCLSTATE();
 2861         if (notdecr)
 2862                 printf("nfscl: never fnd open\n");
 2863         return (0);
 2864 }
 2865 
 2866 APPLESTATIC int
 2867 nfscl_doclose(vnode_t vp, struct nfsclclient **clpp, NFSPROC_T *p)
 2868 {
 2869         struct nfsclclient *clp;
 2870         struct nfsclowner *owp, *nowp;
 2871         struct nfsclopen *op;
 2872         struct nfscldeleg *dp;
 2873         struct nfsfh *nfhp;
 2874         int error;
 2875 
 2876         error = nfscl_getcl(vp, NULL, NULL, &clp);
 2877         if (error)
 2878                 return (error);
 2879         *clpp = clp;
 2880 
 2881         nfhp = VTONFS(vp)->n_fhp;
 2882         NFSLOCKCLSTATE();
 2883         /*
 2884          * First get rid of the local Open structures, which should be no
 2885          * longer in use.
 2886          */
 2887         dp = nfscl_finddeleg(clp, nfhp->nfh_fh, nfhp->nfh_len);
 2888         if (dp != NULL) {
 2889                 LIST_FOREACH_SAFE(owp, &dp->nfsdl_owner, nfsow_list, nowp) {
 2890                         op = LIST_FIRST(&owp->nfsow_open);
 2891                         if (op != NULL) {
 2892                                 KASSERT((op->nfso_opencnt == 0),
 2893                                     ("nfscl: bad open cnt on deleg"));
 2894                                 nfscl_freeopen(op, 1);
 2895                         }
 2896                         nfscl_freeopenowner(owp, 1);
 2897                 }
 2898         }
 2899 
 2900         /* Now process the opens against the server. */
 2901 lookformore:
 2902         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 2903                 op = LIST_FIRST(&owp->nfsow_open);
 2904                 while (op != NULL) {
 2905                         if (op->nfso_fhlen == nfhp->nfh_len &&
 2906                             !NFSBCMP(op->nfso_fh, nfhp->nfh_fh,
 2907                             nfhp->nfh_len)) {
 2908                                 /* Found an open, close it. */
 2909                                 KASSERT((op->nfso_opencnt == 0),
 2910                                     ("nfscl: bad open cnt on server"));
 2911                                 NFSUNLOCKCLSTATE();
 2912                                 nfsrpc_doclose(VFSTONFS(vnode_mount(vp)), op,
 2913                                     p);
 2914                                 NFSLOCKCLSTATE();
 2915                                 goto lookformore;
 2916                         }
 2917                         op = LIST_NEXT(op, nfso_list);
 2918                 }
 2919         }
 2920         NFSUNLOCKCLSTATE();
 2921         return (0);
 2922 }
 2923 
 2924 /*
 2925  * Return all delegations on this client.
 2926  * (Must be called with client sleep lock.)
 2927  */
 2928 static void
 2929 nfscl_delegreturnall(struct nfsclclient *clp, NFSPROC_T *p)
 2930 {
 2931         struct nfscldeleg *dp, *ndp;
 2932         struct ucred *cred;
 2933 
 2934         cred = newnfs_getcred();
 2935         TAILQ_FOREACH_SAFE(dp, &clp->nfsc_deleg, nfsdl_list, ndp) {
 2936                 nfscl_cleandeleg(dp);
 2937                 (void) nfscl_trydelegreturn(dp, cred, clp->nfsc_nmp, p);
 2938                 nfscl_freedeleg(&clp->nfsc_deleg, dp);
 2939         }
 2940         NFSFREECRED(cred);
 2941 }
 2942 
 2943 /*
 2944  * Do a callback RPC.
 2945  */
 2946 APPLESTATIC void
 2947 nfscl_docb(struct nfsrv_descript *nd, NFSPROC_T *p)
 2948 {
 2949         int i, op;
 2950         u_int32_t *tl;
 2951         struct nfsclclient *clp;
 2952         struct nfscldeleg *dp = NULL;
 2953         int numops, taglen = -1, error = 0, trunc, ret = 0;
 2954         u_int32_t minorvers, retops = 0, *retopsp = NULL, *repp, cbident;
 2955         u_char tag[NFSV4_SMALLSTR + 1], *tagstr;
 2956         vnode_t vp = NULL;
 2957         struct nfsnode *np;
 2958         struct vattr va;
 2959         struct nfsfh *nfhp;
 2960         mount_t mp;
 2961         nfsattrbit_t attrbits, rattrbits;
 2962         nfsv4stateid_t stateid;
 2963 
 2964         nfsrvd_rephead(nd);
 2965         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2966         taglen = fxdr_unsigned(int, *tl);
 2967         if (taglen < 0) {
 2968                 error = EBADRPC;
 2969                 goto nfsmout;
 2970         }
 2971         if (taglen <= NFSV4_SMALLSTR)
 2972                 tagstr = tag;
 2973         else
 2974                 tagstr = malloc(taglen + 1, M_TEMP, M_WAITOK);
 2975         error = nfsrv_mtostr(nd, tagstr, taglen);
 2976         if (error) {
 2977                 if (taglen > NFSV4_SMALLSTR)
 2978                         free(tagstr, M_TEMP);
 2979                 taglen = -1;
 2980                 goto nfsmout;
 2981         }
 2982         (void) nfsm_strtom(nd, tag, taglen);
 2983         if (taglen > NFSV4_SMALLSTR) {
 2984                 free(tagstr, M_TEMP);
 2985         }
 2986         NFSM_BUILD(retopsp, u_int32_t *, NFSX_UNSIGNED);
 2987         NFSM_DISSECT(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
 2988         minorvers = fxdr_unsigned(u_int32_t, *tl++);
 2989         if (minorvers != NFSV4_MINORVERSION)
 2990                 nd->nd_repstat = NFSERR_MINORVERMISMATCH;
 2991         cbident = fxdr_unsigned(u_int32_t, *tl++);
 2992         if (nd->nd_repstat)
 2993                 numops = 0;
 2994         else
 2995                 numops = fxdr_unsigned(int, *tl);
 2996         /*
 2997          * Loop around doing the sub ops.
 2998          */
 2999         for (i = 0; i < numops; i++) {
 3000                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 3001                 NFSM_BUILD(repp, u_int32_t *, 2 * NFSX_UNSIGNED);
 3002                 *repp++ = *tl;
 3003                 op = fxdr_unsigned(int, *tl);
 3004                 if (op < NFSV4OP_CBGETATTR || op > NFSV4OP_CBRECALL) {
 3005                     nd->nd_repstat = NFSERR_OPILLEGAL;
 3006                     *repp = nfscl_errmap(nd);
 3007                     retops++;
 3008                     break;
 3009                 }
 3010                 nd->nd_procnum = op;
 3011                 newnfsstats.cbrpccnt[nd->nd_procnum]++;
 3012                 switch (op) {
 3013                 case NFSV4OP_CBGETATTR:
 3014                         clp = NULL;
 3015                         error = nfsm_getfh(nd, &nfhp);
 3016                         if (!error)
 3017                                 error = nfsrv_getattrbits(nd, &attrbits,
 3018                                     NULL, NULL);
 3019                         if (!error) {
 3020                                 mp = nfscl_getmnt(cbident);
 3021                                 if (mp == NULL)
 3022                                         error = NFSERR_SERVERFAULT;
 3023                         }
 3024                         if (!error) {
 3025                                 dp = NULL;
 3026                                 NFSLOCKCLSTATE();
 3027                                 clp = nfscl_findcl(VFSTONFS(mp));
 3028                                 if (clp != NULL)
 3029                                         dp = nfscl_finddeleg(clp, nfhp->nfh_fh,
 3030                                             nfhp->nfh_len);
 3031                                 NFSUNLOCKCLSTATE();
 3032                                 if (dp == NULL)
 3033                                         error = NFSERR_SERVERFAULT;
 3034                         }
 3035                         if (!error) {
 3036                                 ret = nfscl_ngetreopen(mp, nfhp->nfh_fh,
 3037                                     nfhp->nfh_len, p, &np);
 3038                                 if (!ret)
 3039                                         vp = NFSTOV(np);
 3040                         }
 3041                         if (nfhp != NULL)
 3042                                 FREE((caddr_t)nfhp, M_NFSFH);
 3043                         if (!error) {
 3044                                 NFSZERO_ATTRBIT(&rattrbits);
 3045                                 if (NFSISSET_ATTRBIT(&attrbits,
 3046                                     NFSATTRBIT_SIZE)) {
 3047                                         if (!ret)
 3048                                                 va.va_size = np->n_size;
 3049                                         else
 3050                                                 va.va_size = dp->nfsdl_size;
 3051                                         NFSSETBIT_ATTRBIT(&rattrbits,
 3052                                             NFSATTRBIT_SIZE);
 3053                                 }
 3054                                 if (NFSISSET_ATTRBIT(&attrbits,
 3055                                     NFSATTRBIT_CHANGE)) {
 3056                                         va.va_filerev = dp->nfsdl_change;
 3057                                         if (ret || (np->n_flag & NDELEGMOD))
 3058                                                 va.va_filerev++;
 3059                                         NFSSETBIT_ATTRBIT(&rattrbits,
 3060                                             NFSATTRBIT_CHANGE);
 3061                                 }
 3062                                 (void) nfsv4_fillattr(nd, NULL, NULL, &va,
 3063                                     NULL, 0, &rattrbits, NULL, NULL, 0, 0);
 3064                                 if (!ret)
 3065                                         vrele(vp);
 3066                         }
 3067                         break;
 3068                 case NFSV4OP_CBRECALL:
 3069                         clp = NULL;
 3070                         NFSM_DISSECT(tl, u_int32_t *, NFSX_STATEID +
 3071                             NFSX_UNSIGNED);
 3072                         stateid.seqid = *tl++;
 3073                         NFSBCOPY((caddr_t)tl, (caddr_t)stateid.other,
 3074                             NFSX_STATEIDOTHER);
 3075                         tl += (NFSX_STATEIDOTHER / NFSX_UNSIGNED);
 3076                         trunc = fxdr_unsigned(int, *tl);
 3077                         error = nfsm_getfh(nd, &nfhp);
 3078                         if (!error) {
 3079                                 mp = nfscl_getmnt(cbident);
 3080                                 if (mp == NULL)
 3081                                         error = NFSERR_SERVERFAULT;
 3082                         }
 3083                         if (!error) {
 3084                                 NFSLOCKCLSTATE();
 3085                                 clp = nfscl_findcl(VFSTONFS(mp));
 3086                                 if (clp != NULL) {
 3087                                         dp = nfscl_finddeleg(clp, nfhp->nfh_fh,
 3088                                             nfhp->nfh_len);
 3089                                         if (dp != NULL) {
 3090                                                 dp->nfsdl_flags |=
 3091                                                     NFSCLDL_RECALL;
 3092                                                 wakeup((caddr_t)clp);
 3093                                         }
 3094                                 } else {
 3095                                         error = NFSERR_SERVERFAULT;
 3096                                 }
 3097                                 NFSUNLOCKCLSTATE();
 3098                         }
 3099                         if (nfhp != NULL)
 3100                                 FREE((caddr_t)nfhp, M_NFSFH);
 3101                         break;
 3102                 };
 3103                 if (error) {
 3104                         if (error == EBADRPC || error == NFSERR_BADXDR) {
 3105                                 nd->nd_repstat = NFSERR_BADXDR;
 3106                         } else {
 3107                                 nd->nd_repstat = error;
 3108                         }
 3109                         error = 0;
 3110                 }
 3111                 retops++;
 3112                 if (nd->nd_repstat) {
 3113                         *repp = nfscl_errmap(nd);
 3114                         break;
 3115                 } else
 3116                         *repp = 0;      /* NFS4_OK */
 3117         }
 3118 nfsmout:
 3119         if (error) {
 3120                 if (error == EBADRPC || error == NFSERR_BADXDR)
 3121                         nd->nd_repstat = NFSERR_BADXDR;
 3122                 else
 3123                         printf("nfsv4 comperr1=%d\n", error);
 3124         }
 3125         if (taglen == -1) {
 3126                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 3127                 *tl++ = 0;
 3128                 *tl = 0;
 3129         } else {
 3130                 *retopsp = txdr_unsigned(retops);
 3131         }
 3132         *nd->nd_errp = nfscl_errmap(nd);
 3133 }
 3134 
 3135 /*
 3136  * Generate the next cbident value. Basically just increment a static value
 3137  * and then check that it isn't already in the list, if it has wrapped around.
 3138  */
 3139 static u_int32_t
 3140 nfscl_nextcbident(void)
 3141 {
 3142         struct nfsclclient *clp;
 3143         int matched;
 3144         static u_int32_t nextcbident = 0;
 3145         static int haswrapped = 0;
 3146 
 3147         nextcbident++;
 3148         if (nextcbident == 0)
 3149                 haswrapped = 1;
 3150         if (haswrapped) {
 3151                 /*
 3152                  * Search the clientid list for one already using this cbident.
 3153                  */
 3154                 do {
 3155                         matched = 0;
 3156                         NFSLOCKCLSTATE();
 3157                         LIST_FOREACH(clp, &nfsclhead, nfsc_list) {
 3158                                 if (clp->nfsc_cbident == nextcbident) {
 3159                                         matched = 1;
 3160                                         break;
 3161                                 }
 3162                         }
 3163                         NFSUNLOCKCLSTATE();
 3164                         if (matched == 1)
 3165                                 nextcbident++;
 3166                 } while (matched);
 3167         }
 3168         return (nextcbident);
 3169 }
 3170 
 3171 /*
 3172  * Get the mount point related to a given cbident.
 3173  */
 3174 static mount_t
 3175 nfscl_getmnt(u_int32_t cbident)
 3176 {
 3177         struct nfsclclient *clp;
 3178         struct nfsmount *nmp;
 3179 
 3180         NFSLOCKCLSTATE();
 3181         LIST_FOREACH(clp, &nfsclhead, nfsc_list) {
 3182                 if (clp->nfsc_cbident == cbident)
 3183                         break;
 3184         }
 3185         if (clp == NULL) {
 3186                 NFSUNLOCKCLSTATE();
 3187                 return (NULL);
 3188         }
 3189         nmp = clp->nfsc_nmp;
 3190         NFSUNLOCKCLSTATE();
 3191         return (nmp->nm_mountp);
 3192 }
 3193 
 3194 /*
 3195  * Search for a lock conflict locally on the client. A conflict occurs if
 3196  * - not same owner and overlapping byte range and at least one of them is
 3197  *   a write lock or this is an unlock.
 3198  */
 3199 static int
 3200 nfscl_localconflict(struct nfsclclient *clp, u_int8_t *fhp, int fhlen,
 3201     struct nfscllock *nlop, u_int8_t *own, struct nfscldeleg *dp,
 3202     struct nfscllock **lopp)
 3203 {
 3204         struct nfsclowner *owp;
 3205         struct nfsclopen *op;
 3206         int ret;
 3207 
 3208         if (dp != NULL) {
 3209                 ret = nfscl_checkconflict(&dp->nfsdl_lock, nlop, own, lopp);
 3210                 if (ret)
 3211                         return (ret);
 3212         }
 3213         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 3214                 LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 3215                         if (op->nfso_fhlen == fhlen &&
 3216                             !NFSBCMP(op->nfso_fh, fhp, fhlen)) {
 3217                                 ret = nfscl_checkconflict(&op->nfso_lock, nlop,
 3218                                     own, lopp);
 3219                                 if (ret)
 3220                                         return (ret);
 3221                         }
 3222                 }
 3223         }
 3224         return (0);
 3225 }
 3226 
 3227 static int
 3228 nfscl_checkconflict(struct nfscllockownerhead *lhp, struct nfscllock *nlop,
 3229     u_int8_t *own, struct nfscllock **lopp)
 3230 {
 3231         struct nfscllockowner *lp;
 3232         struct nfscllock *lop;
 3233 
 3234         LIST_FOREACH(lp, lhp, nfsl_list) {
 3235                 if (NFSBCMP(lp->nfsl_owner, own, NFSV4CL_LOCKNAMELEN)) {
 3236                         LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
 3237                                 if (lop->nfslo_first >= nlop->nfslo_end)
 3238                                         break;
 3239                                 if (lop->nfslo_end <= nlop->nfslo_first)
 3240                                         continue;
 3241                                 if (lop->nfslo_type == F_WRLCK ||
 3242                                     nlop->nfslo_type == F_WRLCK ||
 3243                                     nlop->nfslo_type == F_UNLCK) {
 3244                                         if (lopp != NULL)
 3245                                                 *lopp = lop;
 3246                                         return (NFSERR_DENIED);
 3247                                 }
 3248                         }
 3249                 }
 3250         }
 3251         return (0);
 3252 }
 3253 
 3254 /*
 3255  * Check for a local conflicting lock.
 3256  */
 3257 APPLESTATIC int
 3258 nfscl_lockt(vnode_t vp, struct nfsclclient *clp, u_int64_t off,
 3259     u_int64_t len, struct flock *fl, NFSPROC_T *p)
 3260 {
 3261         struct nfscllock *lop, nlck;
 3262         struct nfscldeleg *dp;
 3263         struct nfsnode *np;
 3264         u_int8_t own[NFSV4CL_LOCKNAMELEN];
 3265         int error;
 3266 
 3267         nlck.nfslo_type = fl->l_type;
 3268         nlck.nfslo_first = off;
 3269         if (len == NFS64BITSSET) {
 3270                 nlck.nfslo_end = NFS64BITSSET;
 3271         } else {
 3272                 nlck.nfslo_end = off + len;
 3273                 if (nlck.nfslo_end <= nlck.nfslo_first)
 3274                         return (NFSERR_INVAL);
 3275         }
 3276         np = VTONFS(vp);
 3277         nfscl_filllockowner(p, own);
 3278         NFSLOCKCLSTATE();
 3279         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 3280         error = nfscl_localconflict(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len,
 3281             &nlck, own, dp, &lop);
 3282         if (error != 0) {
 3283                 fl->l_whence = SEEK_SET;
 3284                 fl->l_start = lop->nfslo_first;
 3285                 if (lop->nfslo_end == NFS64BITSSET)
 3286                         fl->l_len = 0;
 3287                 else
 3288                         fl->l_len = lop->nfslo_end - lop->nfslo_first;
 3289                 fl->l_pid = (pid_t)0;
 3290                 fl->l_type = lop->nfslo_type;
 3291                 error = -1;                     /* no RPC required */
 3292         } else if (dp != NULL && ((dp->nfsdl_flags & NFSCLDL_WRITE) ||
 3293             fl->l_type == F_RDLCK)) {
 3294                 /*
 3295                  * The delegation ensures that there isn't a conflicting
 3296                  * lock on the server, so return -1 to indicate an RPC
 3297                  * isn't required.
 3298                  */
 3299                 fl->l_type = F_UNLCK;
 3300                 error = -1;
 3301         }
 3302         NFSUNLOCKCLSTATE();
 3303         return (error);
 3304 }
 3305 
 3306 /*
 3307  * Handle Recall of a delegation.
 3308  * The clp must be exclusive locked when this is called.
 3309  */
 3310 static int
 3311 nfscl_recalldeleg(struct nfsclclient *clp, struct nfsmount *nmp,
 3312     struct nfscldeleg *dp, vnode_t vp, struct ucred *cred, NFSPROC_T *p,
 3313     int called_from_renewthread)
 3314 {
 3315         struct nfsclowner *owp, *lowp, *nowp;
 3316         struct nfsclopen *op, *lop;
 3317         struct nfscllockowner *lp;
 3318         struct nfscllock *lckp;
 3319         struct nfsnode *np;
 3320         int error = 0, ret, gotvp = 0;
 3321 
 3322         if (vp == NULL) {
 3323                 /*
 3324                  * First, get a vnode for the file. This is needed to do RPCs.
 3325                  */
 3326                 ret = nfscl_ngetreopen(nmp->nm_mountp, dp->nfsdl_fh,
 3327                     dp->nfsdl_fhlen, p, &np);
 3328                 if (ret) {
 3329                         /*
 3330                          * File isn't open, so nothing to move over to the
 3331                          * server.
 3332                          */
 3333                         return (0);
 3334                 }
 3335                 vp = NFSTOV(np);
 3336                 gotvp = 1;
 3337         } else {
 3338                 np = VTONFS(vp);
 3339         }
 3340         dp->nfsdl_flags &= ~NFSCLDL_MODTIMESET;
 3341         NFSINVALATTRCACHE(np);
 3342 
 3343         /*
 3344          * Ok, if it's a write delegation, flush data to the server, so
 3345          * that close/open consistency is retained.
 3346          */
 3347         ret = 0;
 3348         NFSLOCKNODE(np);
 3349         if ((dp->nfsdl_flags & NFSCLDL_WRITE) && (np->n_flag & NMODIFIED)) {
 3350 #ifdef APPLE
 3351                 OSBitOrAtomic((u_int32_t)NDELEGRECALL, (UInt32 *)&np->n_flag);
 3352 #else
 3353                 np->n_flag |= NDELEGRECALL;
 3354 #endif
 3355                 NFSUNLOCKNODE(np);
 3356                 ret = ncl_flush(vp, MNT_WAIT, cred, p, 1,
 3357                     called_from_renewthread);
 3358                 NFSLOCKNODE(np);
 3359 #ifdef APPLE
 3360                 OSBitAndAtomic((int32_t)~(NMODIFIED | NDELEGRECALL), (UInt32 *)&np->n_flag);
 3361 #else
 3362                 np->n_flag &= ~(NMODIFIED | NDELEGRECALL);
 3363 #endif
 3364         }
 3365         NFSUNLOCKNODE(np);
 3366         if (ret == EIO && called_from_renewthread != 0) {
 3367                 /*
 3368                  * If the flush failed with EIO for the renew thread,
 3369                  * return now, so that the dirty buffer will be flushed
 3370                  * later.
 3371                  */
 3372                 if (gotvp != 0)
 3373                         vrele(vp);
 3374                 return (ret);
 3375         }
 3376 
 3377         /*
 3378          * Now, for each openowner with opens issued locally, move them
 3379          * over to state against the server.
 3380          */
 3381         LIST_FOREACH(lowp, &dp->nfsdl_owner, nfsow_list) {
 3382                 lop = LIST_FIRST(&lowp->nfsow_open);
 3383                 if (lop != NULL) {
 3384                         if (LIST_NEXT(lop, nfso_list) != NULL)
 3385                                 panic("nfsdlg mult opens");
 3386                         /*
 3387                          * Look for the same openowner against the server.
 3388                          */
 3389                         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 3390                                 if (!NFSBCMP(lowp->nfsow_owner,
 3391                                     owp->nfsow_owner, NFSV4CL_LOCKNAMELEN)) {
 3392                                         newnfs_copycred(&dp->nfsdl_cred, cred);
 3393                                         ret = nfscl_moveopen(vp, clp, nmp, lop,
 3394                                             owp, dp, cred, p);
 3395                                         if (ret == NFSERR_STALECLIENTID ||
 3396                                             ret == NFSERR_STALEDONTRECOVER) {
 3397                                                 if (gotvp)
 3398                                                         vrele(vp);
 3399                                                 return (ret);
 3400                                         }
 3401                                         if (ret) {
 3402                                                 nfscl_freeopen(lop, 1);
 3403                                                 if (!error)
 3404                                                         error = ret;
 3405                                         }
 3406                                         break;
 3407                                 }
 3408                         }
 3409 
 3410                         /*
 3411                          * If no openowner found, create one and get an open
 3412                          * for it.
 3413                          */
 3414                         if (owp == NULL) {
 3415                                 MALLOC(nowp, struct nfsclowner *,
 3416                                     sizeof (struct nfsclowner), M_NFSCLOWNER,
 3417                                     M_WAITOK);
 3418                                 nfscl_newopen(clp, NULL, &owp, &nowp, &op, 
 3419                                     NULL, lowp->nfsow_owner, dp->nfsdl_fh,
 3420                                     dp->nfsdl_fhlen, NULL);
 3421                                 newnfs_copycred(&dp->nfsdl_cred, cred);
 3422                                 ret = nfscl_moveopen(vp, clp, nmp, lop,
 3423                                     owp, dp, cred, p);
 3424                                 if (ret) {
 3425                                         nfscl_freeopenowner(owp, 0);
 3426                                         if (ret == NFSERR_STALECLIENTID ||
 3427                                             ret == NFSERR_STALEDONTRECOVER) {
 3428                                                 if (gotvp)
 3429                                                         vrele(vp);
 3430                                                 return (ret);
 3431                                         }
 3432                                         if (ret) {
 3433                                                 nfscl_freeopen(lop, 1);
 3434                                                 if (!error)
 3435                                                         error = ret;
 3436                                         }
 3437                                 }
 3438                         }
 3439                 }
 3440         }
 3441 
 3442         /*
 3443          * Now, get byte range locks for any locks done locally.
 3444          */
 3445         LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
 3446                 LIST_FOREACH(lckp, &lp->nfsl_lock, nfslo_list) {
 3447                         newnfs_copycred(&dp->nfsdl_cred, cred);
 3448                         ret = nfscl_relock(vp, clp, nmp, lp, lckp, cred, p);
 3449                         if (ret == NFSERR_STALESTATEID ||
 3450                             ret == NFSERR_STALEDONTRECOVER ||
 3451                             ret == NFSERR_STALECLIENTID) {
 3452                                 if (gotvp)
 3453                                         vrele(vp);
 3454                                 return (ret);
 3455                         }
 3456                         if (ret && !error)
 3457                                 error = ret;
 3458                 }
 3459         }
 3460         if (gotvp)
 3461                 vrele(vp);
 3462         return (error);
 3463 }
 3464 
 3465 /*
 3466  * Move a locally issued open over to an owner on the state list.
 3467  * SIDE EFFECT: If it needs to sleep (do an rpc), it unlocks clstate and
 3468  * returns with it unlocked.
 3469  */
 3470 static int
 3471 nfscl_moveopen(vnode_t vp, struct nfsclclient *clp, struct nfsmount *nmp,
 3472     struct nfsclopen *lop, struct nfsclowner *owp, struct nfscldeleg *dp,
 3473     struct ucred *cred, NFSPROC_T *p)
 3474 {
 3475         struct nfsclopen *op, *nop;
 3476         struct nfscldeleg *ndp;
 3477         struct nfsnode *np;
 3478         int error = 0, newone;
 3479 
 3480         /*
 3481          * First, look for an appropriate open, If found, just increment the
 3482          * opencnt in it.
 3483          */
 3484         LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 3485                 if ((op->nfso_mode & lop->nfso_mode) == lop->nfso_mode &&
 3486                     op->nfso_fhlen == lop->nfso_fhlen &&
 3487                     !NFSBCMP(op->nfso_fh, lop->nfso_fh, op->nfso_fhlen)) {
 3488                         op->nfso_opencnt += lop->nfso_opencnt;
 3489                         nfscl_freeopen(lop, 1);
 3490                         return (0);
 3491                 }
 3492         }
 3493 
 3494         /* No appropriate open, so we have to do one against the server. */
 3495         np = VTONFS(vp);
 3496         MALLOC(nop, struct nfsclopen *, sizeof (struct nfsclopen) +
 3497             lop->nfso_fhlen - 1, M_NFSCLOPEN, M_WAITOK);
 3498         newone = 0;
 3499         nfscl_newopen(clp, NULL, &owp, NULL, &op, &nop, owp->nfsow_owner,
 3500             lop->nfso_fh, lop->nfso_fhlen, &newone);
 3501         ndp = dp;
 3502         error = nfscl_tryopen(nmp, vp, np->n_v4->n4_data, np->n_v4->n4_fhlen,
 3503             lop->nfso_fh, lop->nfso_fhlen, lop->nfso_mode, op,
 3504             NFS4NODENAME(np->n_v4), np->n_v4->n4_namelen, &ndp, 0, 0, cred, p);
 3505         if (error) {
 3506                 if (newone)
 3507                         nfscl_freeopen(op, 0);
 3508         } else {
 3509                 if (newone)
 3510                         newnfs_copyincred(cred, &op->nfso_cred);
 3511                 op->nfso_mode |= lop->nfso_mode;
 3512                 op->nfso_opencnt += lop->nfso_opencnt;
 3513                 nfscl_freeopen(lop, 1);
 3514         }
 3515         if (nop != NULL)
 3516                 FREE((caddr_t)nop, M_NFSCLOPEN);
 3517         if (ndp != NULL) {
 3518                 /*
 3519                  * What should I do with the returned delegation, since the
 3520                  * delegation is being recalled? For now, just printf and
 3521                  * through it away.
 3522                  */
 3523                 printf("Moveopen returned deleg\n");
 3524                 FREE((caddr_t)ndp, M_NFSCLDELEG);
 3525         }
 3526         return (error);
 3527 }
 3528 
 3529 /*
 3530  * Recall all delegations on this client.
 3531  */
 3532 static void
 3533 nfscl_totalrecall(struct nfsclclient *clp)
 3534 {
 3535         struct nfscldeleg *dp;
 3536 
 3537         TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list)
 3538                 dp->nfsdl_flags |= NFSCLDL_RECALL;
 3539 }
 3540 
 3541 /*
 3542  * Relock byte ranges. Called for delegation recall and state expiry.
 3543  */
 3544 static int
 3545 nfscl_relock(vnode_t vp, struct nfsclclient *clp, struct nfsmount *nmp,
 3546     struct nfscllockowner *lp, struct nfscllock *lop, struct ucred *cred,
 3547     NFSPROC_T *p)
 3548 {
 3549         struct nfscllockowner *nlp;
 3550         struct nfsfh *nfhp;
 3551         u_int64_t off, len;
 3552         u_int32_t clidrev = 0;
 3553         int error, newone, donelocally;
 3554 
 3555         off = lop->nfslo_first;
 3556         len = lop->nfslo_end - lop->nfslo_first;
 3557         error = nfscl_getbytelock(vp, off, len, lop->nfslo_type, cred, p,
 3558             clp, 1, lp->nfsl_owner, lp->nfsl_openowner, &nlp, &newone,
 3559             &donelocally);
 3560         if (error || donelocally)
 3561                 return (error);
 3562         if (nmp->nm_clp != NULL)
 3563                 clidrev = nmp->nm_clp->nfsc_clientidrev;
 3564         else
 3565                 clidrev = 0;
 3566         nfhp = VTONFS(vp)->n_fhp;
 3567         error = nfscl_trylock(nmp, vp, nfhp->nfh_fh,
 3568             nfhp->nfh_len, nlp, newone, 0, off,
 3569             len, lop->nfslo_type, cred, p);
 3570         if (error)
 3571                 nfscl_freelockowner(nlp, 0);
 3572         return (error);
 3573 }
 3574 
 3575 /*
 3576  * Called to re-open a file. Basically get a vnode for the file handle
 3577  * and then call nfsrpc_openrpc() to do the rest.
 3578  */
 3579 static int
 3580 nfsrpc_reopen(struct nfsmount *nmp, u_int8_t *fhp, int fhlen,
 3581     u_int32_t mode, struct nfsclopen *op, struct nfscldeleg **dpp,
 3582     struct ucred *cred, NFSPROC_T *p)
 3583 {
 3584         struct nfsnode *np;
 3585         vnode_t vp;
 3586         int error;
 3587 
 3588         error = nfscl_ngetreopen(nmp->nm_mountp, fhp, fhlen, p, &np);
 3589         if (error)
 3590                 return (error);
 3591         vp = NFSTOV(np);
 3592         if (np->n_v4 != NULL) {
 3593                 error = nfscl_tryopen(nmp, vp, np->n_v4->n4_data,
 3594                     np->n_v4->n4_fhlen, fhp, fhlen, mode, op,
 3595                     NFS4NODENAME(np->n_v4), np->n_v4->n4_namelen, dpp, 0, 0,
 3596                     cred, p);
 3597         } else {
 3598                 error = EINVAL;
 3599         }
 3600         vrele(vp);
 3601         return (error);
 3602 }
 3603 
 3604 /*
 3605  * Try an open against the server. Just call nfsrpc_openrpc(), retrying while
 3606  * NFSERR_DELAY. Also, try system credentials, if the passed in credentials
 3607  * fail.
 3608  */
 3609 static int
 3610 nfscl_tryopen(struct nfsmount *nmp, vnode_t vp, u_int8_t *fhp, int fhlen,
 3611     u_int8_t *newfhp, int newfhlen, u_int32_t mode, struct nfsclopen *op,
 3612     u_int8_t *name, int namelen, struct nfscldeleg **ndpp,
 3613     int reclaim, u_int32_t delegtype, struct ucred *cred, NFSPROC_T *p)
 3614 {
 3615         int error;
 3616 
 3617         do {
 3618                 error = nfsrpc_openrpc(nmp, vp, fhp, fhlen, newfhp, newfhlen,
 3619                     mode, op, name, namelen, ndpp, reclaim, delegtype, cred, p,
 3620                     0, 0);
 3621                 if (error == NFSERR_DELAY)
 3622                         (void) nfs_catnap(PZERO, error, "nfstryop");
 3623         } while (error == NFSERR_DELAY);
 3624         if (error == EAUTH || error == EACCES) {
 3625                 /* Try again using system credentials */
 3626                 newnfs_setroot(cred);
 3627                 do {
 3628                     error = nfsrpc_openrpc(nmp, vp, fhp, fhlen, newfhp,
 3629                         newfhlen, mode, op, name, namelen, ndpp, reclaim,
 3630                         delegtype, cred, p, 1, 0);
 3631                     if (error == NFSERR_DELAY)
 3632                         (void) nfs_catnap(PZERO, error, "nfstryop");
 3633                 } while (error == NFSERR_DELAY);
 3634         }
 3635         return (error);
 3636 }
 3637 
 3638 /*
 3639  * Try a byte range lock. Just loop on nfsrpc_lock() while it returns
 3640  * NFSERR_DELAY. Also, retry with system credentials, if the provided
 3641  * cred don't work.
 3642  */
 3643 static int
 3644 nfscl_trylock(struct nfsmount *nmp, vnode_t vp, u_int8_t *fhp,
 3645     int fhlen, struct nfscllockowner *nlp, int newone, int reclaim,
 3646     u_int64_t off, u_int64_t len, short type, struct ucred *cred, NFSPROC_T *p)
 3647 {
 3648         struct nfsrv_descript nfsd, *nd = &nfsd;
 3649         int error;
 3650 
 3651         do {
 3652                 error = nfsrpc_lock(nd, nmp, vp, fhp, fhlen, nlp, newone,
 3653                     reclaim, off, len, type, cred, p, 0);
 3654                 if (!error && nd->nd_repstat == NFSERR_DELAY)
 3655                         (void) nfs_catnap(PZERO, (int)nd->nd_repstat,
 3656                             "nfstrylck");
 3657         } while (!error && nd->nd_repstat == NFSERR_DELAY);
 3658         if (!error)
 3659                 error = nd->nd_repstat;
 3660         if (error == EAUTH || error == EACCES) {
 3661                 /* Try again using root credentials */
 3662                 newnfs_setroot(cred);
 3663                 do {
 3664                         error = nfsrpc_lock(nd, nmp, vp, fhp, fhlen, nlp,
 3665                             newone, reclaim, off, len, type, cred, p, 1);
 3666                         if (!error && nd->nd_repstat == NFSERR_DELAY)
 3667                                 (void) nfs_catnap(PZERO, (int)nd->nd_repstat,
 3668                                     "nfstrylck");
 3669                 } while (!error && nd->nd_repstat == NFSERR_DELAY);
 3670                 if (!error)
 3671                         error = nd->nd_repstat;
 3672         }
 3673         return (error);
 3674 }
 3675 
 3676 /*
 3677  * Try a delegreturn against the server. Just call nfsrpc_delegreturn(),
 3678  * retrying while NFSERR_DELAY. Also, try system credentials, if the passed in
 3679  * credentials fail.
 3680  */
 3681 static int
 3682 nfscl_trydelegreturn(struct nfscldeleg *dp, struct ucred *cred,
 3683     struct nfsmount *nmp, NFSPROC_T *p)
 3684 {
 3685         int error;
 3686 
 3687         do {
 3688                 error = nfsrpc_delegreturn(dp, cred, nmp, p, 0);
 3689                 if (error == NFSERR_DELAY)
 3690                         (void) nfs_catnap(PZERO, error, "nfstrydp");
 3691         } while (error == NFSERR_DELAY);
 3692         if (error == EAUTH || error == EACCES) {
 3693                 /* Try again using system credentials */
 3694                 newnfs_setroot(cred);
 3695                 do {
 3696                         error = nfsrpc_delegreturn(dp, cred, nmp, p, 1);
 3697                         if (error == NFSERR_DELAY)
 3698                                 (void) nfs_catnap(PZERO, error, "nfstrydp");
 3699                 } while (error == NFSERR_DELAY);
 3700         }
 3701         return (error);
 3702 }
 3703 
 3704 /*
 3705  * Try a close against the server. Just call nfsrpc_closerpc(),
 3706  * retrying while NFSERR_DELAY. Also, try system credentials, if the passed in
 3707  * credentials fail.
 3708  */
 3709 APPLESTATIC int
 3710 nfscl_tryclose(struct nfsclopen *op, struct ucred *cred,
 3711     struct nfsmount *nmp, NFSPROC_T *p)
 3712 {
 3713         struct nfsrv_descript nfsd, *nd = &nfsd;
 3714         int error;
 3715 
 3716         do {
 3717                 error = nfsrpc_closerpc(nd, nmp, op, cred, p, 0);
 3718                 if (error == NFSERR_DELAY)
 3719                         (void) nfs_catnap(PZERO, error, "nfstrycl");
 3720         } while (error == NFSERR_DELAY);
 3721         if (error == EAUTH || error == EACCES) {
 3722                 /* Try again using system credentials */
 3723                 newnfs_setroot(cred);
 3724                 do {
 3725                         error = nfsrpc_closerpc(nd, nmp, op, cred, p, 1);
 3726                         if (error == NFSERR_DELAY)
 3727                                 (void) nfs_catnap(PZERO, error, "nfstrycl");
 3728                 } while (error == NFSERR_DELAY);
 3729         }
 3730         return (error);
 3731 }
 3732 
 3733 /*
 3734  * Decide if a delegation on a file permits close without flushing writes
 3735  * to the server. This might be a big performance win in some environments.
 3736  * (Not useful until the client does caching on local stable storage.)
 3737  */
 3738 APPLESTATIC int
 3739 nfscl_mustflush(vnode_t vp)
 3740 {
 3741         struct nfsclclient *clp;
 3742         struct nfscldeleg *dp;
 3743         struct nfsnode *np;
 3744         struct nfsmount *nmp;
 3745 
 3746         np = VTONFS(vp);
 3747         nmp = VFSTONFS(vnode_mount(vp));
 3748         if (!NFSHASNFSV4(nmp))
 3749                 return (1);
 3750         NFSLOCKCLSTATE();
 3751         clp = nfscl_findcl(nmp);
 3752         if (clp == NULL) {
 3753                 NFSUNLOCKCLSTATE();
 3754                 return (1);
 3755         }
 3756         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 3757         if (dp != NULL && (dp->nfsdl_flags & (NFSCLDL_WRITE | NFSCLDL_RECALL))
 3758              == NFSCLDL_WRITE &&
 3759             (dp->nfsdl_sizelimit >= np->n_size ||
 3760              !NFSHASSTRICT3530(nmp))) {
 3761                 NFSUNLOCKCLSTATE();
 3762                 return (0);
 3763         }
 3764         NFSUNLOCKCLSTATE();
 3765         return (1);
 3766 }
 3767 
 3768 /*
 3769  * See if a (write) delegation exists for this file.
 3770  */
 3771 APPLESTATIC int
 3772 nfscl_nodeleg(vnode_t vp, int writedeleg)
 3773 {
 3774         struct nfsclclient *clp;
 3775         struct nfscldeleg *dp;
 3776         struct nfsnode *np;
 3777         struct nfsmount *nmp;
 3778 
 3779         np = VTONFS(vp);
 3780         nmp = VFSTONFS(vnode_mount(vp));
 3781         if (!NFSHASNFSV4(nmp))
 3782                 return (1);
 3783         NFSLOCKCLSTATE();
 3784         clp = nfscl_findcl(nmp);
 3785         if (clp == NULL) {
 3786                 NFSUNLOCKCLSTATE();
 3787                 return (1);
 3788         }
 3789         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 3790         if (dp != NULL && (dp->nfsdl_flags & NFSCLDL_RECALL) == 0 &&
 3791             (writedeleg == 0 || (dp->nfsdl_flags & NFSCLDL_WRITE)
 3792              == NFSCLDL_WRITE)) {
 3793                 NFSUNLOCKCLSTATE();
 3794                 return (0);
 3795         }
 3796         NFSUNLOCKCLSTATE();
 3797         return (1);
 3798 }
 3799 
 3800 /*
 3801  * Look for an associated delegation that should be DelegReturned.
 3802  */
 3803 APPLESTATIC int
 3804 nfscl_removedeleg(vnode_t vp, NFSPROC_T *p, nfsv4stateid_t *stp)
 3805 {
 3806         struct nfsclclient *clp;
 3807         struct nfscldeleg *dp;
 3808         struct nfsclowner *owp;
 3809         struct nfscllockowner *lp;
 3810         struct nfsmount *nmp;
 3811         struct ucred *cred;
 3812         struct nfsnode *np;
 3813         int igotlock = 0, triedrecall = 0, needsrecall, retcnt = 0, islept;
 3814 
 3815         nmp = VFSTONFS(vnode_mount(vp));
 3816         np = VTONFS(vp);
 3817         NFSLOCKCLSTATE();
 3818         /*
 3819          * Loop around waiting for:
 3820          * - outstanding I/O operations on delegations to complete
 3821          * - for a delegation on vp that has state, lock the client and
 3822          *   do a recall
 3823          * - return delegation with no state
 3824          */
 3825         while (1) {
 3826                 clp = nfscl_findcl(nmp);
 3827                 if (clp == NULL) {
 3828                         NFSUNLOCKCLSTATE();
 3829                         return (retcnt);
 3830                 }
 3831                 dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh,
 3832                     np->n_fhp->nfh_len);
 3833                 if (dp != NULL) {
 3834                     /*
 3835                      * Wait for outstanding I/O ops to be done.
 3836                      */
 3837                     if (dp->nfsdl_rwlock.nfslock_usecnt > 0) {
 3838                         if (igotlock) {
 3839                             nfsv4_unlock(&clp->nfsc_lock, 0);
 3840                             igotlock = 0;
 3841                         }
 3842                         dp->nfsdl_rwlock.nfslock_lock |= NFSV4LOCK_WANTED;
 3843                         (void) nfsmsleep(&dp->nfsdl_rwlock,
 3844                             NFSCLSTATEMUTEXPTR, PZERO, "nfscld", NULL);
 3845                         continue;
 3846                     }
 3847                     needsrecall = 0;
 3848                     LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
 3849                         if (!LIST_EMPTY(&owp->nfsow_open)) {
 3850                             needsrecall = 1;
 3851                             break;
 3852                         }
 3853                     }
 3854                     if (!needsrecall) {
 3855                         LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
 3856                             if (!LIST_EMPTY(&lp->nfsl_lock)) {
 3857                                 needsrecall = 1;
 3858                                 break;
 3859                             }
 3860                         }
 3861                     }
 3862                     if (needsrecall && !triedrecall) {
 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                         islept = 0;
 3962                         while (!igotlock) {
 3963                             igotlock = nfsv4_lock(&clp->nfsc_lock, 1,
 3964                                 &islept, NFSCLSTATEMUTEXPTR);
 3965                             if (islept)
 3966                                 break;
 3967                         }
 3968                         if (islept)
 3969                             continue;
 3970                         NFSUNLOCKCLSTATE();
 3971                         cred = newnfs_getcred();
 3972                         newnfs_copycred(&dp->nfsdl_cred, cred);
 3973                         (void) nfscl_recalldeleg(clp, nmp, dp, fvp, cred, p, 0);
 3974                         NFSFREECRED(cred);
 3975                         triedrecall = 1;
 3976                         NFSLOCKCLSTATE();
 3977                         nfsv4_unlock(&clp->nfsc_lock, 0);
 3978                         igotlock = 0;
 3979                         continue;
 3980                     }
 3981                     *fstp = dp->nfsdl_stateid;
 3982                     retcnt++;
 3983                     *gotfdp = 1;
 3984                     nfscl_cleandeleg(dp);
 3985                     nfscl_freedeleg(&clp->nfsc_deleg, dp);
 3986                 }
 3987                 if (igotlock) {
 3988                     nfsv4_unlock(&clp->nfsc_lock, 0);
 3989                     igotlock = 0;
 3990                 }
 3991                 if (tvp != NULL) {
 3992                     np = VTONFS(tvp);
 3993                     dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh,
 3994                         np->n_fhp->nfh_len);
 3995                     if (dp != NULL && *gottdp == 0) {
 3996                         /*
 3997                          * Wait for outstanding I/O ops to be done.
 3998                          */
 3999                         if (dp->nfsdl_rwlock.nfslock_usecnt > 0) {
 4000                             dp->nfsdl_rwlock.nfslock_lock |= NFSV4LOCK_WANTED;
 4001                             (void) nfsmsleep(&dp->nfsdl_rwlock,
 4002                                 NFSCLSTATEMUTEXPTR, PZERO, "nfscld", NULL);
 4003                             continue;
 4004                         }
 4005                         LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
 4006                             if (!LIST_EMPTY(&owp->nfsow_open)) {
 4007                                 NFSUNLOCKCLSTATE();
 4008                                 return (retcnt);
 4009                             }
 4010                         }
 4011                         LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
 4012                             if (!LIST_EMPTY(&lp->nfsl_lock)) {
 4013                                 NFSUNLOCKCLSTATE();
 4014                                 return (retcnt);
 4015                             }
 4016                         }
 4017                         *tstp = dp->nfsdl_stateid;
 4018                         retcnt++;
 4019                         *gottdp = 1;
 4020                         nfscl_cleandeleg(dp);
 4021                         nfscl_freedeleg(&clp->nfsc_deleg, dp);
 4022                     }
 4023                 }
 4024                 NFSUNLOCKCLSTATE();
 4025                 return (retcnt);
 4026         }
 4027 }
 4028 
 4029 /*
 4030  * Get a reference on the clientid associated with the mount point.
 4031  * Return 1 if success, 0 otherwise.
 4032  */
 4033 APPLESTATIC int
 4034 nfscl_getref(struct nfsmount *nmp)
 4035 {
 4036         struct nfsclclient *clp;
 4037 
 4038         NFSLOCKCLSTATE();
 4039         clp = nfscl_findcl(nmp);
 4040         if (clp == NULL) {
 4041                 NFSUNLOCKCLSTATE();
 4042                 return (0);
 4043         }
 4044         nfsv4_getref(&clp->nfsc_lock, NULL, NFSCLSTATEMUTEXPTR);
 4045         NFSUNLOCKCLSTATE();
 4046         return (1);
 4047 }
 4048 
 4049 /*
 4050  * Release a reference on a clientid acquired with the above call.
 4051  */
 4052 APPLESTATIC void
 4053 nfscl_relref(struct nfsmount *nmp)
 4054 {
 4055         struct nfsclclient *clp;
 4056 
 4057         NFSLOCKCLSTATE();
 4058         clp = nfscl_findcl(nmp);
 4059         if (clp == NULL) {
 4060                 NFSUNLOCKCLSTATE();
 4061                 return;
 4062         }
 4063         nfsv4_relref(&clp->nfsc_lock);
 4064         NFSUNLOCKCLSTATE();
 4065 }
 4066 
 4067 /*
 4068  * Save the size attribute in the delegation, since the nfsnode
 4069  * is going away.
 4070  */
 4071 APPLESTATIC void
 4072 nfscl_reclaimnode(vnode_t vp)
 4073 {
 4074         struct nfsclclient *clp;
 4075         struct nfscldeleg *dp;
 4076         struct nfsnode *np = VTONFS(vp);
 4077         struct nfsmount *nmp;
 4078 
 4079         nmp = VFSTONFS(vnode_mount(vp));
 4080         if (!NFSHASNFSV4(nmp))
 4081                 return;
 4082         NFSLOCKCLSTATE();
 4083         clp = nfscl_findcl(nmp);
 4084         if (clp == NULL) {
 4085                 NFSUNLOCKCLSTATE();
 4086                 return;
 4087         }
 4088         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 4089         if (dp != NULL && (dp->nfsdl_flags & NFSCLDL_WRITE))
 4090                 dp->nfsdl_size = np->n_size;
 4091         NFSUNLOCKCLSTATE();
 4092 }
 4093 
 4094 /*
 4095  * Get the saved size attribute in the delegation, since it is a
 4096  * newly allocated nfsnode.
 4097  */
 4098 APPLESTATIC void
 4099 nfscl_newnode(vnode_t vp)
 4100 {
 4101         struct nfsclclient *clp;
 4102         struct nfscldeleg *dp;
 4103         struct nfsnode *np = VTONFS(vp);
 4104         struct nfsmount *nmp;
 4105 
 4106         nmp = VFSTONFS(vnode_mount(vp));
 4107         if (!NFSHASNFSV4(nmp))
 4108                 return;
 4109         NFSLOCKCLSTATE();
 4110         clp = nfscl_findcl(nmp);
 4111         if (clp == NULL) {
 4112                 NFSUNLOCKCLSTATE();
 4113                 return;
 4114         }
 4115         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 4116         if (dp != NULL && (dp->nfsdl_flags & NFSCLDL_WRITE))
 4117                 np->n_size = dp->nfsdl_size;
 4118         NFSUNLOCKCLSTATE();
 4119 }
 4120 
 4121 /*
 4122  * If there is a valid write delegation for this file, set the modtime
 4123  * to the local clock time.
 4124  */
 4125 APPLESTATIC void
 4126 nfscl_delegmodtime(vnode_t vp)
 4127 {
 4128         struct nfsclclient *clp;
 4129         struct nfscldeleg *dp;
 4130         struct nfsnode *np = VTONFS(vp);
 4131         struct nfsmount *nmp;
 4132 
 4133         nmp = VFSTONFS(vnode_mount(vp));
 4134         if (!NFSHASNFSV4(nmp))
 4135                 return;
 4136         NFSLOCKCLSTATE();
 4137         clp = nfscl_findcl(nmp);
 4138         if (clp == NULL) {
 4139                 NFSUNLOCKCLSTATE();
 4140                 return;
 4141         }
 4142         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 4143         if (dp != NULL && (dp->nfsdl_flags & NFSCLDL_WRITE)) {
 4144                 NFSGETNANOTIME(&dp->nfsdl_modtime);
 4145                 dp->nfsdl_flags |= NFSCLDL_MODTIMESET;
 4146         }
 4147         NFSUNLOCKCLSTATE();
 4148 }
 4149 
 4150 /*
 4151  * If there is a valid write delegation for this file with a modtime set,
 4152  * put that modtime in mtime.
 4153  */
 4154 APPLESTATIC void
 4155 nfscl_deleggetmodtime(vnode_t vp, struct timespec *mtime)
 4156 {
 4157         struct nfsclclient *clp;
 4158         struct nfscldeleg *dp;
 4159         struct nfsnode *np = VTONFS(vp);
 4160         struct nfsmount *nmp;
 4161 
 4162         nmp = VFSTONFS(vnode_mount(vp));
 4163         if (!NFSHASNFSV4(nmp))
 4164                 return;
 4165         NFSLOCKCLSTATE();
 4166         clp = nfscl_findcl(nmp);
 4167         if (clp == NULL) {
 4168                 NFSUNLOCKCLSTATE();
 4169                 return;
 4170         }
 4171         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 4172         if (dp != NULL &&
 4173             (dp->nfsdl_flags & (NFSCLDL_WRITE | NFSCLDL_MODTIMESET)) ==
 4174             (NFSCLDL_WRITE | NFSCLDL_MODTIMESET))
 4175                 *mtime = dp->nfsdl_modtime;
 4176         NFSUNLOCKCLSTATE();
 4177 }
 4178 
 4179 static int
 4180 nfscl_errmap(struct nfsrv_descript *nd)
 4181 {
 4182         short *defaulterrp, *errp;
 4183 
 4184         if (!nd->nd_repstat)
 4185                 return (0);
 4186         if (nd->nd_procnum == NFSPROC_NOOP)
 4187                 return (txdr_unsigned(nd->nd_repstat & 0xffff));
 4188         if (nd->nd_repstat == EBADRPC)
 4189                 return (txdr_unsigned(NFSERR_BADXDR));
 4190         if (nd->nd_repstat == NFSERR_MINORVERMISMATCH ||
 4191             nd->nd_repstat == NFSERR_OPILLEGAL)
 4192                 return (txdr_unsigned(nd->nd_repstat));
 4193         errp = defaulterrp = nfscl_cberrmap[nd->nd_procnum];
 4194         while (*++errp)
 4195                 if (*errp == (short)nd->nd_repstat)
 4196                         return (txdr_unsigned(nd->nd_repstat));
 4197         return (txdr_unsigned(*defaulterrp));
 4198 }
 4199 

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