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


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

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    1 /*-
    2  * Copyright (c) 2009 Rick Macklem, University of Guelph
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: releng/8.0/sys/fs/nfsclient/nfs_clstate.c 195819 2009-07-22 14:32:28Z 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 extrema.
   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 serailization:
   54  *   - For the ClientId, is 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 *, struct nfscllock *,
  120     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 *);
  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                 *retp = NFSCLOPEN_OK;
  279 
  280         /*
  281          * Now, check the mode on the open and return the appropriate
  282          * value.
  283          */
  284         if (op != NULL && (amode & ~(op->nfso_mode))) {
  285                 op->nfso_mode |= amode;
  286                 if (retp != NULL && dp == NULL)
  287                         *retp = NFSCLOPEN_DOOPEN;
  288         }
  289         return (0);
  290 }
  291 
  292 /*
  293  * Create a new open, as required.
  294  */
  295 static void
  296 nfscl_newopen(struct nfsclclient *clp, struct nfscldeleg *dp,
  297     struct nfsclowner **owpp, struct nfsclowner **nowpp, struct nfsclopen **opp,
  298     struct nfsclopen **nopp, u_int8_t *own, u_int8_t *fhp, int fhlen,
  299     int *newonep)
  300 {
  301         struct nfsclowner *owp = *owpp, *nowp;
  302         struct nfsclopen *op, *nop;
  303 
  304         if (nowpp != NULL)
  305                 nowp = *nowpp;
  306         else
  307                 nowp = NULL;
  308         if (nopp != NULL)
  309                 nop = *nopp;
  310         else
  311                 nop = NULL;
  312         if (owp == NULL && nowp != NULL) {
  313                 NFSBCOPY(own, nowp->nfsow_owner, NFSV4CL_LOCKNAMELEN);
  314                 LIST_INIT(&nowp->nfsow_open);
  315                 nowp->nfsow_clp = clp;
  316                 nowp->nfsow_seqid = 0;
  317                 nowp->nfsow_defunct = 0;
  318                 nfscl_lockinit(&nowp->nfsow_rwlock);
  319                 if (dp != NULL) {
  320                         newnfsstats.cllocalopenowners++;
  321                         LIST_INSERT_HEAD(&dp->nfsdl_owner, nowp, nfsow_list);
  322                 } else {
  323                         newnfsstats.clopenowners++;
  324                         LIST_INSERT_HEAD(&clp->nfsc_owner, nowp, nfsow_list);
  325                 }
  326                 owp = *owpp = nowp;
  327                 *nowpp = NULL;
  328                 if (newonep != NULL)
  329                         *newonep = 1;
  330         }
  331 
  332          /* If an fhp has been specified, create an Open as well. */
  333         if (fhp != NULL) {
  334                 /* and look for the correct open, based upon FH */
  335                 LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
  336                         if (op->nfso_fhlen == fhlen &&
  337                             !NFSBCMP(op->nfso_fh, fhp, fhlen))
  338                                 break;
  339                 }
  340                 if (op == NULL && nop != NULL) {
  341                         nop->nfso_own = owp;
  342                         nop->nfso_mode = 0;
  343                         nop->nfso_opencnt = 0;
  344                         nop->nfso_posixlock = 1;
  345                         nop->nfso_fhlen = fhlen;
  346                         NFSBCOPY(fhp, nop->nfso_fh, fhlen);
  347                         LIST_INIT(&nop->nfso_lock);
  348                         nop->nfso_stateid.seqid = 0;
  349                         nop->nfso_stateid.other[0] = 0;
  350                         nop->nfso_stateid.other[1] = 0;
  351                         nop->nfso_stateid.other[2] = 0;
  352                         if (dp != NULL) {
  353                                 TAILQ_REMOVE(&clp->nfsc_deleg, dp, nfsdl_list);
  354                                 TAILQ_INSERT_HEAD(&clp->nfsc_deleg, dp,
  355                                     nfsdl_list);
  356                                 dp->nfsdl_timestamp = NFSD_MONOSEC + 120;
  357                                 newnfsstats.cllocalopens++;
  358                         } else {
  359                                 newnfsstats.clopens++;
  360                         }
  361                         LIST_INSERT_HEAD(&owp->nfsow_open, nop, nfso_list);
  362                         *opp = nop;
  363                         *nopp = NULL;
  364                         if (newonep != NULL)
  365                                 *newonep = 1;
  366                 } else {
  367                         *opp = op;
  368                 }
  369         }
  370 }
  371 
  372 /*
  373  * Called to find/add a delegation to a client.
  374  */
  375 APPLESTATIC int
  376 nfscl_deleg(mount_t mp, struct nfsclclient *clp, u_int8_t *nfhp,
  377     int fhlen, struct ucred *cred, NFSPROC_T *p, struct nfscldeleg **dpp)
  378 {
  379         struct nfscldeleg *dp = *dpp, *tdp;
  380 
  381         /*
  382          * First, if we have received a Read delegation for a file on a
  383          * read/write file system, just return it, because they aren't
  384          * useful, imho.
  385          */
  386         if (mp != NULL && dp != NULL && !NFSMNT_RDONLY(mp) &&
  387             (dp->nfsdl_flags & NFSCLDL_READ)) {
  388                 (void) nfscl_trydelegreturn(dp, cred, VFSTONFS(mp), p);
  389                 FREE((caddr_t)dp, M_NFSCLDELEG);
  390                 *dpp = NULL;
  391                 return (0);
  392         }
  393 
  394         /* Look for the correct deleg, based upon FH */
  395         NFSLOCKCLSTATE();
  396         tdp = nfscl_finddeleg(clp, nfhp, fhlen);
  397         if (tdp == NULL) {
  398                 if (dp == NULL) {
  399                         NFSUNLOCKCLSTATE();
  400                         return (NFSERR_BADSTATEID);
  401                 }
  402                 *dpp = NULL;
  403                 TAILQ_INSERT_HEAD(&clp->nfsc_deleg, dp, nfsdl_list);
  404                 LIST_INSERT_HEAD(NFSCLDELEGHASH(clp, nfhp, fhlen), dp,
  405                     nfsdl_hash);
  406                 dp->nfsdl_timestamp = NFSD_MONOSEC + 120;
  407                 newnfsstats.cldelegates++;
  408                 nfscl_delegcnt++;
  409         } else {
  410                 /*
  411                  * Delegation already exists, what do we do if a new one??
  412                  */
  413                 if (dp != NULL) {
  414                         printf("Deleg already exists!\n");
  415                         FREE((caddr_t)dp, M_NFSCLDELEG);
  416                         *dpp = NULL;
  417                 } else {
  418                         *dpp = tdp;
  419                 }
  420         }
  421         NFSUNLOCKCLSTATE();
  422         return (0);
  423 }
  424 
  425 /*
  426  * Find a delegation for this file handle. Return NULL upon failure.
  427  */
  428 static struct nfscldeleg *
  429 nfscl_finddeleg(struct nfsclclient *clp, u_int8_t *fhp, int fhlen)
  430 {
  431         struct nfscldeleg *dp;
  432 
  433         LIST_FOREACH(dp, NFSCLDELEGHASH(clp, fhp, fhlen), nfsdl_hash) {
  434             if (dp->nfsdl_fhlen == fhlen &&
  435                 !NFSBCMP(dp->nfsdl_fh, fhp, fhlen))
  436                 break;
  437         }
  438         return (dp);
  439 }
  440 
  441 /*
  442  * Get a stateid for an I/O operation. First, look for an open and iff
  443  * found, return either a lockowner stateid or the open stateid.
  444  * If no Open is found, just return error and the special stateid of all zeros.
  445  */
  446 APPLESTATIC int
  447 nfscl_getstateid(vnode_t vp, u_int8_t *nfhp, int fhlen, u_int32_t mode,
  448     struct ucred *cred, NFSPROC_T *p, nfsv4stateid_t *stateidp,
  449     void **lckpp)
  450 {
  451         struct nfsclclient *clp;
  452         struct nfsclowner *owp;
  453         struct nfsclopen *op = NULL;
  454         struct nfscllockowner *lp;
  455         struct nfscldeleg *dp;
  456         struct nfsnode *np;
  457         u_int8_t own[NFSV4CL_LOCKNAMELEN];
  458         int error, done;
  459 
  460         *lckpp = NULL;
  461         /*
  462          * Initially, just set the special stateid of all zeros.
  463          */
  464         stateidp->seqid = 0;
  465         stateidp->other[0] = 0;
  466         stateidp->other[1] = 0;
  467         stateidp->other[2] = 0;
  468         if (vnode_vtype(vp) != VREG)
  469                 return (EISDIR);
  470         np = VTONFS(vp);
  471         NFSLOCKCLSTATE();
  472         clp = nfscl_findcl(VFSTONFS(vnode_mount(vp)));
  473         if (clp == NULL) {
  474                 NFSUNLOCKCLSTATE();
  475                 return (EACCES);
  476         }
  477 
  478         /*
  479          * First, look for a delegation.
  480          */
  481         LIST_FOREACH(dp, NFSCLDELEGHASH(clp, nfhp, fhlen), nfsdl_hash) {
  482                 if (dp->nfsdl_fhlen == fhlen &&
  483                     !NFSBCMP(nfhp, dp->nfsdl_fh, fhlen)) {
  484                         if (!(mode & NFSV4OPEN_ACCESSWRITE) ||
  485                             (dp->nfsdl_flags & NFSCLDL_WRITE)) {
  486                                 stateidp->seqid = dp->nfsdl_stateid.seqid;
  487                                 stateidp->other[0] = dp->nfsdl_stateid.other[0];
  488                                 stateidp->other[1] = dp->nfsdl_stateid.other[1];
  489                                 stateidp->other[2] = dp->nfsdl_stateid.other[2];
  490                                 if (!(np->n_flag & NDELEGRECALL)) {
  491                                         TAILQ_REMOVE(&clp->nfsc_deleg, dp,
  492                                             nfsdl_list);
  493                                         TAILQ_INSERT_HEAD(&clp->nfsc_deleg, dp,
  494                                             nfsdl_list);
  495                                         dp->nfsdl_timestamp = NFSD_MONOSEC +
  496                                             120;
  497                                         dp->nfsdl_rwlock.nfslock_usecnt++;
  498                                         *lckpp = (void *)&dp->nfsdl_rwlock;
  499                                 }
  500                                 NFSUNLOCKCLSTATE();
  501                                 return (0);
  502                         }
  503                         break;
  504                 }
  505         }
  506 
  507         if (p != NULL) {
  508                 /*
  509                  * If p != NULL, we want to search the parentage tree
  510                  * for a matching OpenOwner and use that.
  511                  */
  512                 nfscl_filllockowner(p, own);
  513                 error = nfscl_getopen(&clp->nfsc_owner, nfhp, fhlen, NULL, p,
  514                     mode, NULL, &op);
  515                 if (error == 0) {
  516                         /* now look for a lockowner */
  517                         LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
  518                                 if (!NFSBCMP(lp->nfsl_owner, own,
  519                                     NFSV4CL_LOCKNAMELEN)) {
  520                                         stateidp->seqid =
  521                                             lp->nfsl_stateid.seqid;
  522                                         stateidp->other[0] =
  523                                             lp->nfsl_stateid.other[0];
  524                                         stateidp->other[1] =
  525                                             lp->nfsl_stateid.other[1];
  526                                         stateidp->other[2] =
  527                                             lp->nfsl_stateid.other[2];
  528                                         NFSUNLOCKCLSTATE();
  529                                         return (0);
  530                                 }
  531                         }
  532                 }
  533         }
  534         if (op == NULL) {
  535                 /* If not found, just look for any OpenOwner that will work. */
  536                 done = 0;
  537                 owp = LIST_FIRST(&clp->nfsc_owner);
  538                 while (!done && owp != NULL) {
  539                         LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
  540                                 if (op->nfso_fhlen == fhlen &&
  541                                     !NFSBCMP(op->nfso_fh, nfhp, fhlen) &&
  542                                     (mode & op->nfso_mode) == mode) {
  543                                         done = 1;
  544                                         break;
  545                                 }
  546                         }
  547                         if (!done)
  548                                 owp = LIST_NEXT(owp, nfsow_list);
  549                 }
  550                 if (!done) {
  551                         NFSUNLOCKCLSTATE();
  552                         return (ENOENT);
  553                 }
  554                 /* for read aheads or write behinds, use the open cred */
  555                 newnfs_copycred(&op->nfso_cred, cred);
  556         }
  557 
  558         /*
  559          * No lock stateid, so return the open stateid.
  560          */
  561         stateidp->seqid = op->nfso_stateid.seqid;
  562         stateidp->other[0] = op->nfso_stateid.other[0];
  563         stateidp->other[1] = op->nfso_stateid.other[1];
  564         stateidp->other[2] = op->nfso_stateid.other[2];
  565         NFSUNLOCKCLSTATE();
  566         return (0);
  567 }
  568 
  569 /*
  570  * Get an existing open. Search up the parentage tree for a match and
  571  * return with the first one found.
  572  */
  573 static int
  574 nfscl_getopen(struct nfsclownerhead *ohp, u_int8_t *nfhp, int fhlen,
  575     u_int8_t *rown, NFSPROC_T *p, u_int32_t mode, struct nfsclowner **owpp,
  576     struct nfsclopen **opp)
  577 {
  578         struct nfsclowner *owp = NULL;
  579         struct nfsclopen *op;
  580         NFSPROC_T *nproc;
  581         u_int8_t own[NFSV4CL_LOCKNAMELEN], *ownp;
  582 
  583         nproc = p;
  584         op = NULL;
  585         while (op == NULL && (nproc != NULL || rown != NULL)) {
  586                 if (nproc != NULL) {
  587                         nfscl_filllockowner(nproc, own);
  588                         ownp = own;
  589                 } else {
  590                         ownp = rown;
  591                 }
  592                 /* Search the client list */
  593                 LIST_FOREACH(owp, ohp, nfsow_list) {
  594                         if (!NFSBCMP(owp->nfsow_owner, ownp,
  595                             NFSV4CL_LOCKNAMELEN))
  596                                 break;
  597                 }
  598                 if (owp != NULL) {
  599                         /* and look for the correct open */
  600                         LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
  601                                 if (op->nfso_fhlen == fhlen &&
  602                                     !NFSBCMP(op->nfso_fh, nfhp, fhlen)
  603                                     && (op->nfso_mode & mode) == mode) {
  604                                         break;
  605                                 }
  606                         }
  607                 }
  608                 if (rown != NULL)
  609                         break;
  610                 if (op == NULL)
  611                         nproc = nfscl_getparent(nproc);
  612         }
  613         if (op == NULL) {
  614                 return (EBADF);
  615         }
  616         if (owpp)
  617                 *owpp = owp;
  618         *opp = op;
  619         return (0);
  620 }
  621 
  622 /*
  623  * Release use of an open owner. Called when open operations are done
  624  * with the open owner.
  625  */
  626 APPLESTATIC void
  627 nfscl_ownerrelease(struct nfsclowner *owp, __unused int error,
  628     __unused int candelete, int unlocked)
  629 {
  630 
  631         if (owp == NULL)
  632                 return;
  633         NFSLOCKCLSTATE();
  634         if (!unlocked)
  635                 nfscl_lockunlock(&owp->nfsow_rwlock);
  636         nfscl_clrelease(owp->nfsow_clp);
  637         NFSUNLOCKCLSTATE();
  638 }
  639 
  640 /*
  641  * Release use of an open structure under an open owner.
  642  */
  643 APPLESTATIC void
  644 nfscl_openrelease(struct nfsclopen *op, int error, int candelete)
  645 {
  646         struct nfsclclient *clp;
  647         struct nfsclowner *owp;
  648 
  649         if (op == NULL)
  650                 return;
  651         NFSLOCKCLSTATE();
  652         owp = op->nfso_own;
  653         nfscl_lockunlock(&owp->nfsow_rwlock);
  654         clp = owp->nfsow_clp;
  655         if (error && candelete && op->nfso_opencnt == 0)
  656                 nfscl_freeopen(op, 0);
  657         nfscl_clrelease(clp);
  658         NFSUNLOCKCLSTATE();
  659 }
  660 
  661 /*
  662  * Called to get a clientid structure. It will optionally lock the
  663  * client data structures to do the SetClientId/SetClientId_confirm,
  664  * but will release that lock and return the clientid with a refernce
  665  * count on it.
  666  * If the "cred" argument is NULL, a new clientid should not be created.
  667  * If the "p" argument is NULL, a SetClientID/SetClientIDConfirm cannot
  668  * be done.
  669  * It always clpp with a reference count on it, unless returning an error.
  670  */
  671 APPLESTATIC int
  672 nfscl_getcl(vnode_t vp, struct ucred *cred, NFSPROC_T *p,
  673     struct nfsclclient **clpp)
  674 {
  675         struct nfsclclient *clp;
  676         struct nfsclclient *newclp = NULL;
  677         struct nfscllockowner *lp, *nlp;
  678         struct nfsmount *nmp = VFSTONFS(vnode_mount(vp));
  679         char uuid[HOSTUUIDLEN];
  680         int igotlock = 0, error, trystalecnt, clidinusedelay, i;
  681         u_int16_t idlen = 0;
  682 
  683         if (cred != NULL) {
  684                 getcredhostuuid(cred, uuid, sizeof uuid);
  685                 idlen = strlen(uuid);
  686                 if (idlen > 0)
  687                         idlen += sizeof (u_int64_t);
  688                 else
  689                         idlen += sizeof (u_int64_t) + 16; /* 16 random bytes */
  690                 MALLOC(newclp, struct nfsclclient *,
  691                     sizeof (struct nfsclclient) + idlen - 1, M_NFSCLCLIENT,
  692                     M_WAITOK);
  693         }
  694         NFSLOCKCLSTATE();
  695         clp = nmp->nm_clp;
  696         if (clp == NULL) {
  697                 if (newclp == NULL) {
  698                         NFSUNLOCKCLSTATE();
  699                         return (EACCES);
  700                 }
  701                 clp = newclp;
  702                 NFSBZERO((caddr_t)clp, sizeof(struct nfsclclient) + idlen - 1);
  703                 clp->nfsc_idlen = idlen;
  704                 LIST_INIT(&clp->nfsc_owner);
  705                 TAILQ_INIT(&clp->nfsc_deleg);
  706                 for (i = 0; i < NFSCLDELEGHASHSIZE; i++)
  707                         LIST_INIT(&clp->nfsc_deleghash[i]);
  708                 LIST_INIT(&clp->nfsc_defunctlockowner);
  709                 clp->nfsc_flags = NFSCLFLAGS_INITED;
  710                 clp->nfsc_clientidrev = 1;
  711                 clp->nfsc_cbident = nfscl_nextcbident();
  712                 nfscl_fillclid(nmp->nm_clval, uuid, clp->nfsc_id,
  713                     clp->nfsc_idlen);
  714                 LIST_INSERT_HEAD(&nfsclhead, clp, nfsc_list);
  715                 nmp->nm_clp = clp;
  716                 clp->nfsc_nmp = nmp;
  717                 NFSUNLOCKCLSTATE();
  718                 nfscl_start_renewthread(clp);
  719         } else {
  720                 NFSUNLOCKCLSTATE();
  721                 if (newclp != NULL)
  722                         FREE((caddr_t)newclp, M_NFSCLCLIENT);
  723         }
  724         NFSLOCKCLSTATE();
  725         while ((clp->nfsc_flags & NFSCLFLAGS_HASCLIENTID) == 0 && !igotlock)
  726                 igotlock = nfsv4_lock(&clp->nfsc_lock, 1, NULL,
  727                     NFSCLSTATEMUTEXPTR);
  728         if (!igotlock)
  729                 nfsv4_getref(&clp->nfsc_lock, NULL, NFSCLSTATEMUTEXPTR);
  730         NFSUNLOCKCLSTATE();
  731 
  732         /*
  733          * If it needs a clientid, do the setclientid now.
  734          */
  735         if ((clp->nfsc_flags & NFSCLFLAGS_HASCLIENTID) == 0) {
  736                 if (!igotlock)
  737                         panic("nfscl_clget");
  738                 if (p == NULL || cred == NULL) {
  739                         NFSLOCKCLSTATE();
  740                         nfsv4_unlock(&clp->nfsc_lock, 0);
  741                         NFSUNLOCKCLSTATE();
  742                         return (EACCES);
  743                 }
  744                 /* get rid of defunct lockowners */
  745                 LIST_FOREACH_SAFE(lp, &clp->nfsc_defunctlockowner, nfsl_list,
  746                     nlp) {
  747                         nfscl_freelockowner(lp, 0);
  748                 }
  749                 /*
  750                  * If RFC3530 Sec. 14.2.33 is taken literally,
  751                  * NFSERR_CLIDINUSE will be returned persistently for the
  752                  * case where a new mount of the same file system is using
  753                  * a different principal. In practice, NFSERR_CLIDINUSE is
  754                  * only returned when there is outstanding unexpired state
  755                  * on the clientid. As such, try for twice the lease
  756                  * interval, if we know what that is. Otherwise, make a
  757                  * wild ass guess.
  758                  * The case of returning NFSERR_STALECLIENTID is far less
  759                  * likely, but might occur if there is a significant delay
  760                  * between doing the SetClientID and SetClientIDConfirm Ops,
  761                  * such that the server throws away the clientid before
  762                  * receiving the SetClientIDConfirm.
  763                  */
  764                 if (clp->nfsc_renew > 0)
  765                         clidinusedelay = NFSCL_LEASE(clp->nfsc_renew) * 2;
  766                 else
  767                         clidinusedelay = 120;
  768                 trystalecnt = 3;
  769                 do {
  770                         error = nfsrpc_setclient(VFSTONFS(vnode_mount(vp)),
  771                             clp, cred, p);
  772                         if (error == NFSERR_STALECLIENTID ||
  773                             error == NFSERR_STALEDONTRECOVER ||
  774                             error == NFSERR_CLIDINUSE) {
  775                                 (void) nfs_catnap(PZERO, "nfs_setcl");
  776                         }
  777                 } while (((error == NFSERR_STALECLIENTID ||
  778                      error == NFSERR_STALEDONTRECOVER) && --trystalecnt > 0) ||
  779                     (error == NFSERR_CLIDINUSE && --clidinusedelay > 0));
  780                 if (error) {
  781                         NFSLOCKCLSTATE();
  782                         nfsv4_unlock(&clp->nfsc_lock, 0);
  783                         NFSUNLOCKCLSTATE();
  784                         return (error);
  785                 }
  786                 clp->nfsc_flags |= NFSCLFLAGS_HASCLIENTID;
  787         }
  788         if (igotlock) {
  789                 NFSLOCKCLSTATE();
  790                 nfsv4_unlock(&clp->nfsc_lock, 1);
  791                 NFSUNLOCKCLSTATE();
  792         }
  793 
  794         *clpp = clp;
  795         return (0);
  796 }
  797 
  798 /*
  799  * Get a reference to a clientid and return it, if valid.
  800  */
  801 APPLESTATIC struct nfsclclient *
  802 nfscl_findcl(struct nfsmount *nmp)
  803 {
  804         struct nfsclclient *clp;
  805 
  806         clp = nmp->nm_clp;
  807         if (clp == NULL || !(clp->nfsc_flags & NFSCLFLAGS_HASCLIENTID))
  808                 return (NULL);
  809         return (clp);
  810 }
  811 
  812 /*
  813  * Release the clientid structure. It may be locked or reference counted.
  814  */
  815 static void
  816 nfscl_clrelease(struct nfsclclient *clp)
  817 {
  818 
  819         if (clp->nfsc_lock.nfslock_lock & NFSV4LOCK_LOCK)
  820                 nfsv4_unlock(&clp->nfsc_lock, 0);
  821         else
  822                 nfsv4_relref(&clp->nfsc_lock);
  823 }
  824 
  825 /*
  826  * External call for nfscl_clrelease.
  827  */
  828 APPLESTATIC void
  829 nfscl_clientrelease(struct nfsclclient *clp)
  830 {
  831 
  832         NFSLOCKCLSTATE();
  833         if (clp->nfsc_lock.nfslock_lock & NFSV4LOCK_LOCK)
  834                 nfsv4_unlock(&clp->nfsc_lock, 0);
  835         else
  836                 nfsv4_relref(&clp->nfsc_lock);
  837         NFSUNLOCKCLSTATE();
  838 }
  839 
  840 /*
  841  * Called when wanting to lock a byte region.
  842  */
  843 APPLESTATIC int
  844 nfscl_getbytelock(vnode_t vp, u_int64_t off, u_int64_t len,
  845     short type, struct ucred *cred, NFSPROC_T *p, struct nfsclclient *rclp,
  846     int recovery, u_int8_t *rownp, u_int8_t *ropenownp,
  847     struct nfscllockowner **lpp, int *newonep, int *donelocallyp)
  848 {
  849         struct nfscllockowner *lp;
  850         struct nfsclopen *op;
  851         struct nfsclclient *clp;
  852         struct nfscllockowner *nlp;
  853         struct nfscllock *nlop, *otherlop;
  854         struct nfscldeleg *dp = NULL, *ldp = NULL;
  855         struct nfscllockownerhead *lhp = NULL;
  856         struct nfsnode *np;
  857         u_int8_t own[NFSV4CL_LOCKNAMELEN], *ownp;
  858         int error = 0, ret, donelocally = 0;
  859         u_int32_t mode;
  860 
  861         if (type == F_WRLCK)
  862                 mode = NFSV4OPEN_ACCESSWRITE;
  863         else
  864                 mode = NFSV4OPEN_ACCESSREAD;
  865         np = VTONFS(vp);
  866         *lpp = NULL;
  867         *newonep = 0;
  868         *donelocallyp = 0;
  869 
  870         /*
  871          * Might need these, so MALLOC them now, to
  872          * avoid a tsleep() in MALLOC later.
  873          */
  874         MALLOC(nlp, struct nfscllockowner *,
  875             sizeof (struct nfscllockowner), M_NFSCLLOCKOWNER, M_WAITOK);
  876         MALLOC(otherlop, struct nfscllock *,
  877             sizeof (struct nfscllock), M_NFSCLLOCK, M_WAITOK);
  878         MALLOC(nlop, struct nfscllock *,
  879             sizeof (struct nfscllock), M_NFSCLLOCK, M_WAITOK);
  880         nlop->nfslo_type = type;
  881         nlop->nfslo_first = off;
  882         if (len == NFS64BITSSET) {
  883                 nlop->nfslo_end = NFS64BITSSET;
  884         } else {
  885                 nlop->nfslo_end = off + len;
  886                 if (nlop->nfslo_end <= nlop->nfslo_first)
  887                         error = NFSERR_INVAL;
  888         }
  889 
  890         if (!error) {
  891                 if (recovery)
  892                         clp = rclp;
  893                 else
  894                         error = nfscl_getcl(vp, cred, p, &clp);
  895         }
  896         if (error) {
  897                 FREE((caddr_t)nlp, M_NFSCLLOCKOWNER);
  898                 FREE((caddr_t)otherlop, M_NFSCLLOCK);
  899                 FREE((caddr_t)nlop, M_NFSCLLOCK);
  900                 return (error);
  901         }
  902 
  903         op = NULL;
  904         if (recovery) {
  905                 ownp = rownp;
  906         } else {
  907                 nfscl_filllockowner(p, own);
  908                 ownp = own;
  909         }
  910         if (!recovery) {
  911                 NFSLOCKCLSTATE();
  912                 /*
  913                  * First, search for a delegation. If one exists for this file,
  914                  * the lock can be done locally against it, so long as there
  915                  * isn't a local lock conflict.
  916                  */
  917                 ldp = dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh,
  918                     np->n_fhp->nfh_len);
  919                 /* Just sanity check for correct type of delegation */
  920                 if (dp != NULL && ((dp->nfsdl_flags & NFSCLDL_RECALL) ||
  921                     (type == F_WRLCK && !(dp->nfsdl_flags & NFSCLDL_WRITE))))
  922                         dp = NULL;
  923         }
  924         if (dp != NULL) {
  925                 /* Now, find the associated open to get the correct openowner */
  926                 ret = nfscl_getopen(&dp->nfsdl_owner, np->n_fhp->nfh_fh,
  927                     np->n_fhp->nfh_len, NULL, p, mode, NULL, &op);
  928                 if (ret)
  929                         ret = nfscl_getopen(&clp->nfsc_owner,
  930                             np->n_fhp->nfh_fh, np->n_fhp->nfh_len, NULL, p,
  931                             mode, NULL, &op);
  932                 if (!ret) {
  933                         lhp = &dp->nfsdl_lock;
  934                         TAILQ_REMOVE(&clp->nfsc_deleg, dp, nfsdl_list);
  935                         TAILQ_INSERT_HEAD(&clp->nfsc_deleg, dp, nfsdl_list);
  936                         dp->nfsdl_timestamp = NFSD_MONOSEC + 120;
  937                         donelocally = 1;
  938                 } else {
  939                         dp = NULL;
  940                 }
  941         }
  942         if (!donelocally) {
  943                 /*
  944                  * Get the related Open.
  945                  */
  946                 if (recovery)
  947                         error = nfscl_getopen(&clp->nfsc_owner,
  948                             np->n_fhp->nfh_fh, np->n_fhp->nfh_len, ropenownp,
  949                             NULL, mode, NULL, &op);
  950                 else
  951                         error = nfscl_getopen(&clp->nfsc_owner,
  952                             np->n_fhp->nfh_fh, np->n_fhp->nfh_len, NULL, p,
  953                             mode, NULL, &op);
  954                 if (!error)
  955                         lhp = &op->nfso_lock;
  956         }
  957         if (!error && !recovery)
  958                 error = nfscl_localconflict(clp, nlop, ownp, ldp, NULL);
  959         if (error) {
  960                 if (!recovery) {
  961                         nfscl_clrelease(clp);
  962                         NFSUNLOCKCLSTATE();
  963                 }
  964                 FREE((caddr_t)nlp, M_NFSCLLOCKOWNER);
  965                 FREE((caddr_t)otherlop, M_NFSCLLOCK);
  966                 FREE((caddr_t)nlop, M_NFSCLLOCK);
  967                 return (error);
  968         }
  969 
  970         /*
  971          * Ok, see if a lockowner exists and create one, as required.
  972          */
  973         LIST_FOREACH(lp, lhp, nfsl_list) {
  974                 if (!NFSBCMP(lp->nfsl_owner, ownp, NFSV4CL_LOCKNAMELEN))
  975                         break;
  976         }
  977         if (lp == NULL) {
  978                 NFSBCOPY(ownp, nlp->nfsl_owner, NFSV4CL_LOCKNAMELEN);
  979                 if (recovery)
  980                         NFSBCOPY(ropenownp, nlp->nfsl_openowner,
  981                             NFSV4CL_LOCKNAMELEN);
  982                 else
  983                         NFSBCOPY(op->nfso_own->nfsow_owner, nlp->nfsl_openowner,
  984                             NFSV4CL_LOCKNAMELEN);
  985                 nlp->nfsl_seqid = 0;
  986                 nlp->nfsl_defunct = 0;
  987                 nlp->nfsl_inprog = NULL;
  988                 nfscl_lockinit(&nlp->nfsl_rwlock);
  989                 LIST_INIT(&nlp->nfsl_lock);
  990                 if (donelocally) {
  991                         nlp->nfsl_open = NULL;
  992                         newnfsstats.cllocallockowners++;
  993                 } else {
  994                         nlp->nfsl_open = op;
  995                         newnfsstats.cllockowners++;
  996                 }
  997                 LIST_INSERT_HEAD(lhp, nlp, nfsl_list);
  998                 lp = nlp;
  999                 nlp = NULL;
 1000                 *newonep = 1;
 1001         }
 1002 
 1003         /*
 1004          * Now, update the byte ranges for locks.
 1005          */
 1006         ret = nfscl_updatelock(lp, &nlop, &otherlop, donelocally);
 1007         if (!ret)
 1008                 donelocally = 1;
 1009         if (donelocally) {
 1010                 *donelocallyp = 1;
 1011                 if (!recovery)
 1012                         nfscl_clrelease(clp);
 1013         } else {
 1014                 /*
 1015                  * Serial modifications on the lock owner for multiple threads
 1016                  * for the same process using a read/write lock.
 1017                  */
 1018                 if (!recovery)
 1019                         nfscl_lockexcl(&lp->nfsl_rwlock, NFSCLSTATEMUTEXPTR);
 1020         }
 1021         if (!recovery)
 1022                 NFSUNLOCKCLSTATE();
 1023 
 1024         if (nlp)
 1025                 FREE((caddr_t)nlp, M_NFSCLLOCKOWNER);
 1026         if (nlop)
 1027                 FREE((caddr_t)nlop, M_NFSCLLOCK);
 1028         if (otherlop)
 1029                 FREE((caddr_t)otherlop, M_NFSCLLOCK);
 1030 
 1031         *lpp = lp;
 1032         return (0);
 1033 }
 1034 
 1035 /*
 1036  * Called to unlock a byte range, for LockU.
 1037  */
 1038 APPLESTATIC int
 1039 nfscl_relbytelock(vnode_t vp, u_int64_t off, u_int64_t len,
 1040     __unused struct ucred *cred, NFSPROC_T *p, int callcnt,
 1041     struct nfsclclient *clp, struct nfscllockowner **lpp, int *dorpcp)
 1042 {
 1043         struct nfscllockowner *lp;
 1044         struct nfsclowner *owp;
 1045         struct nfsclopen *op;
 1046         struct nfscllock *nlop, *other_lop = NULL;
 1047         struct nfscldeleg *dp;
 1048         struct nfsnode *np;
 1049         u_int8_t own[NFSV4CL_LOCKNAMELEN];
 1050         int ret = 0, fnd, error;
 1051 
 1052         np = VTONFS(vp);
 1053         *lpp = NULL;
 1054         *dorpcp = 0;
 1055 
 1056         /*
 1057          * Might need these, so MALLOC them now, to
 1058          * avoid a tsleep() in MALLOC later.
 1059          */
 1060         MALLOC(nlop, struct nfscllock *,
 1061             sizeof (struct nfscllock), M_NFSCLLOCK, M_WAITOK);
 1062         nlop->nfslo_type = F_UNLCK;
 1063         nlop->nfslo_first = off;
 1064         if (len == NFS64BITSSET) {
 1065                 nlop->nfslo_end = NFS64BITSSET;
 1066         } else {
 1067                 nlop->nfslo_end = off + len;
 1068                 if (nlop->nfslo_end <= nlop->nfslo_first) {
 1069                         FREE((caddr_t)nlop, M_NFSCLLOCK);
 1070                         return (NFSERR_INVAL);
 1071                 }
 1072         }
 1073         if (callcnt == 0) {
 1074                 MALLOC(other_lop, struct nfscllock *,
 1075                     sizeof (struct nfscllock), M_NFSCLLOCK, M_WAITOK);
 1076                 *other_lop = *nlop;
 1077         }
 1078         nfscl_filllockowner(p, own);
 1079         dp = NULL;
 1080         NFSLOCKCLSTATE();
 1081         if (callcnt == 0)
 1082                 dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh,
 1083                     np->n_fhp->nfh_len);
 1084 
 1085         /* Search for a local conflict. */
 1086         error = nfscl_localconflict(clp, nlop, own, dp, NULL);
 1087         if (error) {
 1088                 NFSUNLOCKCLSTATE();
 1089                 FREE((caddr_t)nlop, M_NFSCLLOCK);
 1090                 if (other_lop != NULL)
 1091                         FREE((caddr_t)other_lop, M_NFSCLLOCK);
 1092                 return (error);
 1093         }
 1094 
 1095         /*
 1096          * First, unlock any local regions on a delegation.
 1097          */
 1098         if (dp != NULL) {
 1099                 /* Look for this lockowner. */
 1100                 LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
 1101                         if (!NFSBCMP(lp->nfsl_owner, own,
 1102                             NFSV4CL_LOCKNAMELEN))
 1103                                 break;
 1104                 }
 1105                 if (lp != NULL)
 1106                         /* Use other_lop, so nlop is still available */
 1107                         (void)nfscl_updatelock(lp, &other_lop, NULL, 1);
 1108         }
 1109 
 1110         /*
 1111          * Now, find a matching open/lockowner that hasn't already been done,
 1112          * as marked by nfsl_inprog.
 1113          */
 1114         lp = NULL;
 1115         fnd = 0;
 1116         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 1117             LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 1118                 if (op->nfso_fhlen == np->n_fhp->nfh_len &&
 1119                     !NFSBCMP(op->nfso_fh, np->n_fhp->nfh_fh, op->nfso_fhlen)) {
 1120                     LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
 1121                         if (lp->nfsl_inprog == NULL &&
 1122                             !NFSBCMP(lp->nfsl_owner, own,
 1123                              NFSV4CL_LOCKNAMELEN)) {
 1124                                 fnd = 1;
 1125                                 break;
 1126                         }
 1127                     }
 1128                     if (fnd)
 1129                         break;
 1130                 }
 1131             }
 1132             if (fnd)
 1133                 break;
 1134         }
 1135 
 1136         if (lp != NULL) {
 1137                 ret = nfscl_updatelock(lp, &nlop, NULL, 0);
 1138                 if (ret)
 1139                         *dorpcp = 1;
 1140                 /*
 1141                  * Serial modifications on the lock owner for multiple
 1142                  * threads for the same process using a read/write lock.
 1143                  */
 1144                 lp->nfsl_inprog = p;
 1145                 nfscl_lockexcl(&lp->nfsl_rwlock, NFSCLSTATEMUTEXPTR);
 1146                 *lpp = lp;
 1147         }
 1148         NFSUNLOCKCLSTATE();
 1149         if (nlop)
 1150                 FREE((caddr_t)nlop, M_NFSCLLOCK);
 1151         if (other_lop)
 1152                 FREE((caddr_t)other_lop, M_NFSCLLOCK);
 1153         return (0);
 1154 }
 1155 
 1156 /*
 1157  * Release all lockowners marked in progess for this process and file.
 1158  */
 1159 APPLESTATIC void
 1160 nfscl_releasealllocks(struct nfsclclient *clp, vnode_t vp, NFSPROC_T *p)
 1161 {
 1162         struct nfsclowner *owp;
 1163         struct nfsclopen *op;
 1164         struct nfscllockowner *lp;
 1165         struct nfsnode *np;
 1166         u_int8_t own[NFSV4CL_LOCKNAMELEN];
 1167 
 1168         np = VTONFS(vp);
 1169         nfscl_filllockowner(p, own);
 1170         NFSLOCKCLSTATE();
 1171         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 1172             LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 1173                 if (op->nfso_fhlen == np->n_fhp->nfh_len &&
 1174                     !NFSBCMP(op->nfso_fh, np->n_fhp->nfh_fh, op->nfso_fhlen)) {
 1175                     LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
 1176                         if (lp->nfsl_inprog == p &&
 1177                             !NFSBCMP(lp->nfsl_owner, own,
 1178                             NFSV4CL_LOCKNAMELEN)) {
 1179                             lp->nfsl_inprog = NULL;
 1180                             nfscl_lockunlock(&lp->nfsl_rwlock);
 1181                         }
 1182                     }
 1183                 }
 1184             }
 1185         }
 1186         nfscl_clrelease(clp);
 1187         NFSUNLOCKCLSTATE();
 1188 }
 1189 
 1190 /*
 1191  * Called to find out if any bytes within the byte range specified are
 1192  * write locked by the calling process. Used to determine if flushing
 1193  * is required before a LockU.
 1194  * If in doubt, return 1, so the flush will occur.
 1195  */
 1196 APPLESTATIC int
 1197 nfscl_checkwritelocked(vnode_t vp, struct flock *fl,
 1198     struct ucred *cred, NFSPROC_T *p)
 1199 {
 1200         struct nfsclowner *owp;
 1201         struct nfscllockowner *lp;
 1202         struct nfsclopen *op;
 1203         struct nfsclclient *clp;
 1204         struct nfscllock *lop;
 1205         struct nfscldeleg *dp;
 1206         struct nfsnode *np;
 1207         u_int64_t off, end;
 1208         u_int8_t own[NFSV4CL_LOCKNAMELEN];
 1209         int error = 0;
 1210 
 1211         np = VTONFS(vp);
 1212         switch (fl->l_whence) {
 1213         case SEEK_SET:
 1214         case SEEK_CUR:
 1215                 /*
 1216                  * Caller is responsible for adding any necessary offset
 1217                  * when SEEK_CUR is used.
 1218                  */
 1219                 off = fl->l_start;
 1220                 break;
 1221         case SEEK_END:
 1222                 off = np->n_size + fl->l_start;
 1223                 break;
 1224         default:
 1225                 return (1);
 1226         };
 1227         if (fl->l_len != 0) {
 1228                 end = off + fl->l_len;
 1229                 if (end < off)
 1230                         return (1);
 1231         } else {
 1232                 end = NFS64BITSSET;
 1233         }
 1234 
 1235         error = nfscl_getcl(vp, cred, p, &clp);
 1236         if (error)
 1237                 return (1);
 1238         nfscl_filllockowner(p, own);
 1239         NFSLOCKCLSTATE();
 1240 
 1241         /*
 1242          * First check the delegation locks.
 1243          */
 1244         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 1245         if (dp != NULL) {
 1246                 LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
 1247                         if (!NFSBCMP(lp->nfsl_owner, own,
 1248                             NFSV4CL_LOCKNAMELEN))
 1249                                 break;
 1250                 }
 1251                 if (lp != NULL) {
 1252                         LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
 1253                                 if (lop->nfslo_first >= end)
 1254                                         break;
 1255                                 if (lop->nfslo_end <= off)
 1256                                         continue;
 1257                                 if (lop->nfslo_type == F_WRLCK) {
 1258                                         nfscl_clrelease(clp);
 1259                                         NFSUNLOCKCLSTATE();
 1260                                         return (1);
 1261                                 }
 1262                         }
 1263                 }
 1264         }
 1265 
 1266         /*
 1267          * Now, check state against the server.
 1268          */
 1269         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 1270             LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 1271                 if (op->nfso_fhlen == np->n_fhp->nfh_len &&
 1272                     !NFSBCMP(op->nfso_fh, np->n_fhp->nfh_fh, op->nfso_fhlen)) {
 1273                     LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
 1274                         if (!NFSBCMP(lp->nfsl_owner, own,
 1275                             NFSV4CL_LOCKNAMELEN))
 1276                             break;
 1277                     }
 1278                     if (lp != NULL) {
 1279                         LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
 1280                             if (lop->nfslo_first >= end)
 1281                                 break;
 1282                             if (lop->nfslo_end <= off)
 1283                                 continue;
 1284                             if (lop->nfslo_type == F_WRLCK) {
 1285                                 nfscl_clrelease(clp);
 1286                                 NFSUNLOCKCLSTATE();
 1287                                 return (1);
 1288                             }
 1289                         }
 1290                     }
 1291                 }
 1292             }
 1293         }
 1294         nfscl_clrelease(clp);
 1295         NFSUNLOCKCLSTATE();
 1296         return (0);
 1297 }
 1298 
 1299 /*
 1300  * Release a byte range lock owner structure.
 1301  */
 1302 APPLESTATIC void
 1303 nfscl_lockrelease(struct nfscllockowner *lp, int error, int candelete)
 1304 {
 1305         struct nfsclclient *clp;
 1306 
 1307         if (lp == NULL)
 1308                 return;
 1309         NFSLOCKCLSTATE();
 1310         clp = lp->nfsl_open->nfso_own->nfsow_clp;
 1311         if (error != 0 && candelete &&
 1312             (lp->nfsl_rwlock.nfslock_lock & NFSV4LOCK_WANTED) == 0)
 1313                 nfscl_freelockowner(lp, 0);
 1314         else
 1315                 nfscl_lockunlock(&lp->nfsl_rwlock);
 1316         nfscl_clrelease(clp);
 1317         NFSUNLOCKCLSTATE();
 1318 }
 1319 
 1320 /*
 1321  * Free up an open structure and any associated byte range lock structures.
 1322  */
 1323 APPLESTATIC void
 1324 nfscl_freeopen(struct nfsclopen *op, int local)
 1325 {
 1326 
 1327         LIST_REMOVE(op, nfso_list);
 1328         nfscl_freealllocks(&op->nfso_lock, local);
 1329         FREE((caddr_t)op, M_NFSCLOPEN);
 1330         if (local)
 1331                 newnfsstats.cllocalopens--;
 1332         else
 1333                 newnfsstats.clopens--;
 1334 }
 1335 
 1336 /*
 1337  * Free up all lock owners and associated locks.
 1338  */
 1339 static void
 1340 nfscl_freealllocks(struct nfscllockownerhead *lhp, int local)
 1341 {
 1342         struct nfscllockowner *lp, *nlp;
 1343 
 1344         LIST_FOREACH_SAFE(lp, lhp, nfsl_list, nlp) {
 1345                 if ((lp->nfsl_rwlock.nfslock_lock & NFSV4LOCK_WANTED))
 1346                         panic("nfscllckw");
 1347                 nfscl_freelockowner(lp, local);
 1348         }
 1349 }
 1350 
 1351 /*
 1352  * Called for an Open when NFSERR_EXPIRED is received from the server.
 1353  * If there are no byte range locks nor a Share Deny lost, try to do a
 1354  * fresh Open. Otherwise, free the open.
 1355  */
 1356 static int
 1357 nfscl_expireopen(struct nfsclclient *clp, struct nfsclopen *op,
 1358     struct nfsmount *nmp, struct ucred *cred, NFSPROC_T *p)
 1359 {
 1360         struct nfscllockowner *lp;
 1361         struct nfscldeleg *dp;
 1362         int mustdelete = 0, error;
 1363 
 1364         /*
 1365          * Look for any byte range lock(s).
 1366          */
 1367         LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
 1368                 if (!LIST_EMPTY(&lp->nfsl_lock)) {
 1369                         mustdelete = 1;
 1370                         break;
 1371                 }
 1372         }
 1373 
 1374         /*
 1375          * If no byte range lock(s) nor a Share deny, try to re-open.
 1376          */
 1377         if (!mustdelete && (op->nfso_mode & NFSLCK_DENYBITS) == 0) {
 1378                 newnfs_copycred(&op->nfso_cred, cred);
 1379                 dp = NULL;
 1380                 error = nfsrpc_reopen(nmp, op->nfso_fh,
 1381                     op->nfso_fhlen, op->nfso_mode, op, &dp, cred, p);
 1382                 if (error) {
 1383                         mustdelete = 1;
 1384                         if (dp != NULL) {
 1385                                 FREE((caddr_t)dp, M_NFSCLDELEG);
 1386                                 dp = NULL;
 1387                         }
 1388                 }
 1389                 if (dp != NULL)
 1390                         nfscl_deleg(nmp->nm_mountp, clp, op->nfso_fh,
 1391                             op->nfso_fhlen, cred, p, &dp);
 1392         }
 1393 
 1394         /*
 1395          * If a byte range lock or Share deny or couldn't re-open, free it.
 1396          */
 1397         if (mustdelete)
 1398                 nfscl_freeopen(op, 0);
 1399         return (mustdelete);
 1400 }
 1401 
 1402 /*
 1403  * Free up an open owner structure.
 1404  */
 1405 static void
 1406 nfscl_freeopenowner(struct nfsclowner *owp, int local)
 1407 {
 1408 
 1409         LIST_REMOVE(owp, nfsow_list);
 1410         FREE((caddr_t)owp, M_NFSCLOWNER);
 1411         if (local)
 1412                 newnfsstats.cllocalopenowners--;
 1413         else
 1414                 newnfsstats.clopenowners--;
 1415 }
 1416 
 1417 /*
 1418  * Free up a byte range lock owner structure.
 1419  */
 1420 static void
 1421 nfscl_freelockowner(struct nfscllockowner *lp, int local)
 1422 {
 1423         struct nfscllock *lop, *nlop;
 1424 
 1425         LIST_REMOVE(lp, nfsl_list);
 1426         LIST_FOREACH_SAFE(lop, &lp->nfsl_lock, nfslo_list, nlop) {
 1427                 nfscl_freelock(lop, local);
 1428         }
 1429         FREE((caddr_t)lp, M_NFSCLLOCKOWNER);
 1430         if (local)
 1431                 newnfsstats.cllocallockowners--;
 1432         else
 1433                 newnfsstats.cllockowners--;
 1434 }
 1435 
 1436 /*
 1437  * Free up a byte range lock structure.
 1438  */
 1439 APPLESTATIC void
 1440 nfscl_freelock(struct nfscllock *lop, int local)
 1441 {
 1442 
 1443         LIST_REMOVE(lop, nfslo_list);
 1444         FREE((caddr_t)lop, M_NFSCLLOCK);
 1445         if (local)
 1446                 newnfsstats.cllocallocks--;
 1447         else
 1448                 newnfsstats.cllocks--;
 1449 }
 1450 
 1451 /*
 1452  * Clean out the state related to a delegation.
 1453  */
 1454 static void
 1455 nfscl_cleandeleg(struct nfscldeleg *dp)
 1456 {
 1457         struct nfsclowner *owp, *nowp;
 1458         struct nfsclopen *op;
 1459 
 1460         LIST_FOREACH_SAFE(owp, &dp->nfsdl_owner, nfsow_list, nowp) {
 1461                 op = LIST_FIRST(&owp->nfsow_open);
 1462                 if (op != NULL) {
 1463                         if (LIST_NEXT(op, nfso_list) != NULL)
 1464                                 panic("nfscleandel");
 1465                         nfscl_freeopen(op, 1);
 1466                 }
 1467                 nfscl_freeopenowner(owp, 1);
 1468         }
 1469         nfscl_freealllocks(&dp->nfsdl_lock, 1);
 1470 }
 1471 
 1472 /*
 1473  * Free a delegation.
 1474  */
 1475 static void
 1476 nfscl_freedeleg(struct nfscldeleghead *hdp, struct nfscldeleg *dp)
 1477 {
 1478 
 1479         TAILQ_REMOVE(hdp, dp, nfsdl_list);
 1480         LIST_REMOVE(dp, nfsdl_hash);
 1481         FREE((caddr_t)dp, M_NFSCLDELEG);
 1482         newnfsstats.cldelegates--;
 1483         nfscl_delegcnt--;
 1484 }
 1485 
 1486 /*
 1487  * Free up all state related to this client structure.
 1488  */
 1489 static void
 1490 nfscl_cleanclient(struct nfsclclient *clp)
 1491 {
 1492         struct nfsclowner *owp, *nowp;
 1493         struct nfsclopen *op, *nop;
 1494         struct nfscllockowner *lp, *nlp;
 1495 
 1496 
 1497         /* get rid of defunct lockowners */
 1498         LIST_FOREACH_SAFE(lp, &clp->nfsc_defunctlockowner, nfsl_list, nlp) {
 1499                 nfscl_freelockowner(lp, 0);
 1500         }
 1501 
 1502         /* Now, all the OpenOwners, etc. */
 1503         LIST_FOREACH_SAFE(owp, &clp->nfsc_owner, nfsow_list, nowp) {
 1504                 LIST_FOREACH_SAFE(op, &owp->nfsow_open, nfso_list, nop) {
 1505                         nfscl_freeopen(op, 0);
 1506                 }
 1507                 nfscl_freeopenowner(owp, 0);
 1508         }
 1509 }
 1510 
 1511 /*
 1512  * Called when an NFSERR_EXPIRED is received from the server.
 1513  */
 1514 static void
 1515 nfscl_expireclient(struct nfsclclient *clp, struct nfsmount *nmp,
 1516     struct ucred *cred, NFSPROC_T *p)
 1517 {
 1518         struct nfsclowner *owp, *nowp, *towp;
 1519         struct nfsclopen *op, *nop, *top;
 1520         struct nfscldeleg *dp, *ndp;
 1521         int ret, printed = 0;
 1522 
 1523         /*
 1524          * First, merge locally issued Opens into the list for the server.
 1525          */
 1526         dp = TAILQ_FIRST(&clp->nfsc_deleg);
 1527         while (dp != NULL) {
 1528             ndp = TAILQ_NEXT(dp, nfsdl_list);
 1529             owp = LIST_FIRST(&dp->nfsdl_owner);
 1530             while (owp != NULL) {
 1531                 nowp = LIST_NEXT(owp, nfsow_list);
 1532                 op = LIST_FIRST(&owp->nfsow_open);
 1533                 if (op != NULL) {
 1534                     if (LIST_NEXT(op, nfso_list) != NULL)
 1535                         panic("nfsclexp");
 1536                     LIST_FOREACH(towp, &clp->nfsc_owner, nfsow_list) {
 1537                         if (!NFSBCMP(towp->nfsow_owner, owp->nfsow_owner,
 1538                             NFSV4CL_LOCKNAMELEN))
 1539                             break;
 1540                     }
 1541                     if (towp != NULL) {
 1542                         /* Merge opens in */
 1543                         LIST_FOREACH(top, &towp->nfsow_open, nfso_list) {
 1544                             if (top->nfso_fhlen == op->nfso_fhlen &&
 1545                                 !NFSBCMP(top->nfso_fh, op->nfso_fh,
 1546                                  op->nfso_fhlen)) {
 1547                                 top->nfso_mode |= op->nfso_mode;
 1548                                 top->nfso_opencnt += op->nfso_opencnt;
 1549                                 break;
 1550                             }
 1551                         }
 1552                         if (top == NULL) {
 1553                             /* Just add the open to the owner list */
 1554                             LIST_REMOVE(op, nfso_list);
 1555                             op->nfso_own = towp;
 1556                             LIST_INSERT_HEAD(&towp->nfsow_open, op, nfso_list);
 1557                             newnfsstats.cllocalopens--;
 1558                             newnfsstats.clopens++;
 1559                         }
 1560                     } else {
 1561                         /* Just add the openowner to the client list */
 1562                         LIST_REMOVE(owp, nfsow_list);
 1563                         owp->nfsow_clp = clp;
 1564                         LIST_INSERT_HEAD(&clp->nfsc_owner, owp, nfsow_list);
 1565                         newnfsstats.cllocalopenowners--;
 1566                         newnfsstats.clopenowners++;
 1567                         newnfsstats.cllocalopens--;
 1568                         newnfsstats.clopens++;
 1569                     }
 1570                 }
 1571                 owp = nowp;
 1572             }
 1573             if (!printed && !LIST_EMPTY(&dp->nfsdl_lock)) {
 1574                 printed = 1;
 1575                 printf("nfsv4 expired locks lost\n");
 1576             }
 1577             nfscl_cleandeleg(dp);
 1578             nfscl_freedeleg(&clp->nfsc_deleg, dp);
 1579             dp = ndp;
 1580         }
 1581         if (!TAILQ_EMPTY(&clp->nfsc_deleg))
 1582             panic("nfsclexp");
 1583 
 1584         /*
 1585          * Now, try and reopen against the server.
 1586          */
 1587         LIST_FOREACH_SAFE(owp, &clp->nfsc_owner, nfsow_list, nowp) {
 1588                 owp->nfsow_seqid = 0;
 1589                 LIST_FOREACH_SAFE(op, &owp->nfsow_open, nfso_list, nop) {
 1590                         ret = nfscl_expireopen(clp, op, nmp, cred, p);
 1591                         if (ret && !printed) {
 1592                                 printed = 1;
 1593                                 printf("nfsv4 expired locks lost\n");
 1594                         }
 1595                 }
 1596                 if (LIST_EMPTY(&owp->nfsow_open))
 1597                         nfscl_freeopenowner(owp, 0);
 1598         }
 1599 }
 1600 
 1601 #ifndef __FreeBSD__
 1602 /*
 1603  * Called from exit() upon process termination.
 1604  */
 1605 APPLESTATIC void
 1606 nfscl_cleanup(NFSPROC_T *p)
 1607 {
 1608         struct nfsclclient *clp;
 1609         u_int8_t own[NFSV4CL_LOCKNAMELEN];
 1610 
 1611         if (!nfscl_inited)
 1612                 return;
 1613         nfscl_filllockowner(p, own);
 1614 
 1615         NFSLOCKCLSTATE();
 1616         /*
 1617          * Loop through all the clientids, looking for the OpenOwners.
 1618          */
 1619         LIST_FOREACH(clp, &nfsclhead, nfsc_list)
 1620                 nfscl_cleanup_common(clp, own);
 1621         NFSUNLOCKCLSTATE();
 1622 }
 1623 #endif  /* !__FreeBSD__ */
 1624 
 1625 /*
 1626  * Common code used by nfscl_cleanup() and nfscl_cleanupkext().
 1627  * Must be called with CLSTATE lock held.
 1628  */
 1629 static void
 1630 nfscl_cleanup_common(struct nfsclclient *clp, u_int8_t *own)
 1631 {
 1632         struct nfsclowner *owp, *nowp;
 1633         struct nfsclopen *op;
 1634         struct nfscllockowner *lp, *nlp;
 1635         struct nfscldeleg *dp;
 1636 
 1637         /* First, get rid of local locks on delegations. */
 1638         TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
 1639                 LIST_FOREACH_SAFE(lp, &dp->nfsdl_lock, nfsl_list, nlp) {
 1640                     if (!NFSBCMP(lp->nfsl_owner, own, NFSV4CL_LOCKNAMELEN)) {
 1641                         if ((lp->nfsl_rwlock.nfslock_lock & NFSV4LOCK_WANTED))
 1642                             panic("nfscllckw");
 1643                         nfscl_freelockowner(lp, 1);
 1644                     }
 1645                 }
 1646         }
 1647         owp = LIST_FIRST(&clp->nfsc_owner);
 1648         while (owp != NULL) {
 1649                 nowp = LIST_NEXT(owp, nfsow_list);
 1650                 if (!NFSBCMP(owp->nfsow_owner, own,
 1651                     NFSV4CL_LOCKNAMELEN)) {
 1652                         /*
 1653                          * If there are children that haven't closed the
 1654                          * file descriptors yet, the opens will still be
 1655                          * here. For that case, let the renew thread clear
 1656                          * out the OpenOwner later.
 1657                          */
 1658                         if (LIST_EMPTY(&owp->nfsow_open))
 1659                                 nfscl_freeopenowner(owp, 0);
 1660                         else
 1661                                 owp->nfsow_defunct = 1;
 1662                 } else {
 1663                         /* look for lockowners on other opens */
 1664                         LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 1665                                 LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
 1666                                         if (!NFSBCMP(lp->nfsl_owner, own,
 1667                                             NFSV4CL_LOCKNAMELEN))
 1668                                                 lp->nfsl_defunct = 1;
 1669                                 }
 1670                         }
 1671                 }
 1672                 owp = nowp;
 1673         }
 1674 
 1675         /* and check the defunct list */
 1676         LIST_FOREACH(lp, &clp->nfsc_defunctlockowner, nfsl_list) {
 1677                 if (!NFSBCMP(lp->nfsl_owner, own, NFSV4CL_LOCKNAMELEN))
 1678                     lp->nfsl_defunct = 1;
 1679         }
 1680 }
 1681 
 1682 #if defined(APPLEKEXT) || defined(__FreeBSD__)
 1683 /*
 1684  * Simulate the call nfscl_cleanup() by looking for open owners associated
 1685  * with processes that no longer exist, since a call to nfscl_cleanup()
 1686  * can't be patched into exit().
 1687  */
 1688 static void
 1689 nfscl_cleanupkext(struct nfsclclient *clp)
 1690 {
 1691         struct nfsclowner *owp, *nowp;
 1692         struct nfscllockowner *lp;
 1693 
 1694         NFSPROCLISTLOCK();
 1695         NFSLOCKCLSTATE();
 1696         LIST_FOREACH_SAFE(owp, &clp->nfsc_owner, nfsow_list, nowp) {
 1697                 if (nfscl_procdoesntexist(owp->nfsow_owner))
 1698                         nfscl_cleanup_common(clp, owp->nfsow_owner);
 1699         }
 1700 
 1701         /* and check the defunct list */
 1702         LIST_FOREACH(lp, &clp->nfsc_defunctlockowner, nfsl_list) {
 1703                 if (nfscl_procdoesntexist(lp->nfsl_owner))
 1704                         lp->nfsl_defunct = 1;
 1705         }
 1706         NFSUNLOCKCLSTATE();
 1707         NFSPROCLISTUNLOCK();
 1708 }
 1709 #endif  /* APPLEKEXT || __FreeBSD__ */
 1710 
 1711 /*
 1712  * Called from nfs umount to free up the clientid.
 1713  */
 1714 APPLESTATIC void
 1715 nfscl_umount(struct nfsmount *nmp, NFSPROC_T *p)
 1716 {
 1717         struct nfsclclient *clp;
 1718         struct ucred *cred;
 1719         int igotlock;
 1720 
 1721         clp = nmp->nm_clp;
 1722         if (clp != NULL) {
 1723                 if ((clp->nfsc_flags & NFSCLFLAGS_INITED) == 0)
 1724                         panic("nfscl umount");
 1725         
 1726                 /*
 1727                  * First, handshake with the nfscl renew thread, to terminate
 1728                  * it.
 1729                  */
 1730                 clp->nfsc_flags |= NFSCLFLAGS_UMOUNT;
 1731                 while (clp->nfsc_flags & NFSCLFLAGS_HASTHREAD)
 1732                         (void) tsleep((caddr_t)clp, PWAIT, "nfsclumnt", hz);
 1733         
 1734                 NFSLOCKCLSTATE();
 1735                 do {
 1736                         igotlock = nfsv4_lock(&clp->nfsc_lock, 1, NULL,
 1737                             NFSCLSTATEMUTEXPTR);
 1738                 } while (!igotlock);
 1739                 NFSUNLOCKCLSTATE();
 1740         
 1741                 /*
 1742                  * Free up all the state. It will expire on the server, but
 1743                  * maybe we should do a SetClientId/SetClientIdConfirm so
 1744                  * the server throws it away?
 1745                  */
 1746                 LIST_REMOVE(clp, nfsc_list);
 1747                 nfscl_delegreturnall(clp, p);
 1748                 cred = newnfs_getcred();
 1749                 (void) nfsrpc_setclient(nmp, clp, cred, p);
 1750                 nfscl_cleanclient(clp);
 1751                 nmp->nm_clp = NULL;
 1752                 NFSFREECRED(cred);
 1753                 FREE((caddr_t)clp, M_NFSCLCLIENT);
 1754         }
 1755 
 1756 }
 1757 
 1758 /*
 1759  * This function is called when a server replies with NFSERR_STALECLIENTID
 1760  * or NFSERR_STALESTATEID. It traverses the clientid lists, doing Opens
 1761  * and Locks with reclaim. If these fail, it deletes the corresponding state.
 1762  */
 1763 static void
 1764 nfscl_recover(struct nfsclclient *clp, struct ucred *cred, NFSPROC_T *p)
 1765 {
 1766         struct nfsclowner *owp, *nowp;
 1767         struct nfsclopen *op, *nop;
 1768         struct nfscllockowner *lp, *nlp;
 1769         struct nfscllock *lop, *nlop;
 1770         struct nfscldeleg *dp, *ndp, *tdp;
 1771         struct nfsmount *nmp;
 1772         struct ucred *tcred;
 1773         struct nfsclopenhead extra_open;
 1774         struct nfscldeleghead extra_deleg;
 1775         struct nfsreq *rep;
 1776         u_int64_t len;
 1777         u_int32_t delegtype = NFSV4OPEN_DELEGATEWRITE, mode;
 1778         int igotlock = 0, error, trycnt, firstlock, s;
 1779 
 1780         /*
 1781          * First, lock the client structure, so everyone else will
 1782          * block when trying to use state.
 1783          */
 1784         NFSLOCKCLSTATE();
 1785         do {
 1786                 igotlock = nfsv4_lock(&clp->nfsc_lock, 1, NULL,
 1787                     NFSCLSTATEMUTEXPTR);
 1788         } while (!igotlock);
 1789         NFSUNLOCKCLSTATE();
 1790 
 1791         nmp = clp->nfsc_nmp;
 1792         if (nmp == NULL)
 1793                 panic("nfscl recover");
 1794         trycnt = 5;
 1795         do {
 1796                 error = nfsrpc_setclient(nmp, clp, cred, p);
 1797         } while ((error == NFSERR_STALECLIENTID ||
 1798              error == NFSERR_STALEDONTRECOVER) && --trycnt > 0);
 1799         if (error) {
 1800                 nfscl_cleanclient(clp);
 1801                 clp->nfsc_flags &= ~(NFSCLFLAGS_HASCLIENTID |
 1802                     NFSCLFLAGS_RECOVER);
 1803                 NFSLOCKCLSTATE();
 1804                 nfsv4_unlock(&clp->nfsc_lock, 0);
 1805                 NFSUNLOCKCLSTATE();
 1806                 return;
 1807         }
 1808         clp->nfsc_flags |= NFSCLFLAGS_HASCLIENTID;
 1809         clp->nfsc_flags &= ~NFSCLFLAGS_RECOVER;
 1810 
 1811         /*
 1812          * Mark requests already queued on the server, so that they don't
 1813          * initiate another recovery cycle. Any requests already in the
 1814          * queue that handle state information will have the old stale
 1815          * clientid/stateid and will get a NFSERR_STALESTATEID or
 1816          * NFSERR_STALECLIENTID reply from the server. This will be
 1817          * translated to NFSERR_STALEDONTRECOVER when R_DONTRECOVER is set.
 1818          */
 1819         s = splsoftclock();
 1820         NFSLOCKREQ();
 1821         TAILQ_FOREACH(rep, &nfsd_reqq, r_chain) {
 1822                 if (rep->r_nmp == nmp)
 1823                         rep->r_flags |= R_DONTRECOVER;
 1824         }
 1825         NFSUNLOCKREQ();
 1826         splx(s);
 1827 
 1828         /* get rid of defunct lockowners */
 1829         LIST_FOREACH_SAFE(lp, &clp->nfsc_defunctlockowner, nfsl_list, nlp) {
 1830                 nfscl_freelockowner(lp, 0);
 1831         }
 1832 
 1833         /*
 1834          * Now, mark all delegations "need reclaim".
 1835          */
 1836         TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list)
 1837                 dp->nfsdl_flags |= NFSCLDL_NEEDRECLAIM;
 1838 
 1839         TAILQ_INIT(&extra_deleg);
 1840         LIST_INIT(&extra_open);
 1841         /*
 1842          * Now traverse the state lists, doing Open and Lock Reclaims.
 1843          */
 1844         tcred = newnfs_getcred();
 1845         owp = LIST_FIRST(&clp->nfsc_owner);
 1846         while (owp != NULL) {
 1847             nowp = LIST_NEXT(owp, nfsow_list);
 1848             owp->nfsow_seqid = 0;
 1849             op = LIST_FIRST(&owp->nfsow_open);
 1850             while (op != NULL) {
 1851                 nop = LIST_NEXT(op, nfso_list);
 1852                 if (error != NFSERR_NOGRACE) {
 1853                     /* Search for a delegation to reclaim with the open */
 1854                     TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
 1855                         if (!(dp->nfsdl_flags & NFSCLDL_NEEDRECLAIM))
 1856                             continue;
 1857                         if ((dp->nfsdl_flags & NFSCLDL_WRITE)) {
 1858                             mode = NFSV4OPEN_ACCESSWRITE;
 1859                             delegtype = NFSV4OPEN_DELEGATEWRITE;
 1860                         } else {
 1861                             mode = NFSV4OPEN_ACCESSREAD;
 1862                             delegtype = NFSV4OPEN_DELEGATEREAD;
 1863                         }
 1864                         if ((op->nfso_mode & mode) == mode &&
 1865                             op->nfso_fhlen == dp->nfsdl_fhlen &&
 1866                             !NFSBCMP(op->nfso_fh, dp->nfsdl_fh, op->nfso_fhlen))
 1867                             break;
 1868                     }
 1869                     ndp = dp;
 1870                     if (dp == NULL)
 1871                         delegtype = NFSV4OPEN_DELEGATENONE;
 1872                     newnfs_copycred(&op->nfso_cred, tcred);
 1873                     error = nfscl_tryopen(nmp, NULL, op->nfso_fh,
 1874                         op->nfso_fhlen, op->nfso_fh, op->nfso_fhlen,
 1875                         op->nfso_mode, op, NULL, 0, &ndp, 1, delegtype,
 1876                         tcred, p);
 1877                     if (!error) {
 1878                         /* Handle any replied delegation */
 1879                         if (ndp != NULL && ((ndp->nfsdl_flags & NFSCLDL_WRITE)
 1880                             || NFSMNT_RDONLY(nmp->nm_mountp))) {
 1881                             if ((ndp->nfsdl_flags & NFSCLDL_WRITE))
 1882                                 mode = NFSV4OPEN_ACCESSWRITE;
 1883                             else
 1884                                 mode = NFSV4OPEN_ACCESSREAD;
 1885                             TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
 1886                                 if (!(dp->nfsdl_flags & NFSCLDL_NEEDRECLAIM))
 1887                                     continue;
 1888                                 if ((op->nfso_mode & mode) == mode &&
 1889                                     op->nfso_fhlen == dp->nfsdl_fhlen &&
 1890                                     !NFSBCMP(op->nfso_fh, dp->nfsdl_fh,
 1891                                     op->nfso_fhlen)) {
 1892                                     dp->nfsdl_stateid = ndp->nfsdl_stateid;
 1893                                     dp->nfsdl_sizelimit = ndp->nfsdl_sizelimit;
 1894                                     dp->nfsdl_ace = ndp->nfsdl_ace;
 1895                                     dp->nfsdl_change = ndp->nfsdl_change;
 1896                                     dp->nfsdl_flags &= ~NFSCLDL_NEEDRECLAIM;
 1897                                     if ((ndp->nfsdl_flags & NFSCLDL_RECALL))
 1898                                         dp->nfsdl_flags |= NFSCLDL_RECALL;
 1899                                     FREE((caddr_t)ndp, M_NFSCLDELEG);
 1900                                     ndp = NULL;
 1901                                     break;
 1902                                 }
 1903                             }
 1904                         }
 1905                         if (ndp != NULL)
 1906                             TAILQ_INSERT_HEAD(&extra_deleg, ndp, nfsdl_list);
 1907 
 1908                         /* and reclaim all byte range locks */
 1909                         lp = LIST_FIRST(&op->nfso_lock);
 1910                         while (lp != NULL) {
 1911                             nlp = LIST_NEXT(lp, nfsl_list);
 1912                             lp->nfsl_seqid = 0;
 1913                             firstlock = 1;
 1914                             lop = LIST_FIRST(&lp->nfsl_lock);
 1915                             while (lop != NULL) {
 1916                                 nlop = LIST_NEXT(lop, nfslo_list);
 1917                                 if (lop->nfslo_end == NFS64BITSSET)
 1918                                     len = NFS64BITSSET;
 1919                                 else
 1920                                     len = lop->nfslo_end - lop->nfslo_first;
 1921                                 if (error != NFSERR_NOGRACE)
 1922                                     error = nfscl_trylock(nmp, NULL,
 1923                                         op->nfso_fh, op->nfso_fhlen, lp,
 1924                                         firstlock, 1, lop->nfslo_first, len,
 1925                                         lop->nfslo_type, tcred, p);
 1926                                 if (error != 0)
 1927                                     nfscl_freelock(lop, 0);
 1928                                 else
 1929                                     firstlock = 0;
 1930                                 lop = nlop;
 1931                             }
 1932                             /* If no locks, but a lockowner, just delete it. */
 1933                             if (LIST_EMPTY(&lp->nfsl_lock))
 1934                                 nfscl_freelockowner(lp, 0);
 1935                             lp = nlp;
 1936                         }
 1937                     } else {
 1938                         nfscl_freeopen(op, 0);
 1939                     }
 1940                 }
 1941                 op = nop;
 1942             }
 1943             owp = nowp;
 1944         }
 1945 
 1946         /*
 1947          * Now, try and get any delegations not yet reclaimed by cobbling
 1948          * to-gether an appropriate open.
 1949          */
 1950         nowp = NULL;
 1951         dp = TAILQ_FIRST(&clp->nfsc_deleg);
 1952         while (dp != NULL) {
 1953             ndp = TAILQ_NEXT(dp, nfsdl_list);
 1954             if ((dp->nfsdl_flags & NFSCLDL_NEEDRECLAIM)) {
 1955                 if (nowp == NULL) {
 1956                     MALLOC(nowp, struct nfsclowner *,
 1957                         sizeof (struct nfsclowner), M_NFSCLOWNER, M_WAITOK);
 1958                     /*
 1959                      * Name must be as long an largest possible
 1960                      * NFSV4CL_LOCKNAMELEN. 12 for now.
 1961                      */
 1962                     NFSBCOPY("RECLAIMDELEG", nowp->nfsow_owner,
 1963                         NFSV4CL_LOCKNAMELEN);
 1964                     LIST_INIT(&nowp->nfsow_open);
 1965                     nowp->nfsow_clp = clp;
 1966                     nowp->nfsow_seqid = 0;
 1967                     nowp->nfsow_defunct = 0;
 1968                     nfscl_lockinit(&nowp->nfsow_rwlock);
 1969                 }
 1970                 nop = NULL;
 1971                 if (error != NFSERR_NOGRACE) {
 1972                     MALLOC(nop, struct nfsclopen *, sizeof (struct nfsclopen) +
 1973                         dp->nfsdl_fhlen - 1, M_NFSCLOPEN, M_WAITOK);
 1974                     nop->nfso_own = nowp;
 1975                     if ((dp->nfsdl_flags & NFSCLDL_WRITE)) {
 1976                         nop->nfso_mode = NFSV4OPEN_ACCESSWRITE;
 1977                         delegtype = NFSV4OPEN_DELEGATEWRITE;
 1978                     } else {
 1979                         nop->nfso_mode = NFSV4OPEN_ACCESSREAD;
 1980                         delegtype = NFSV4OPEN_DELEGATEREAD;
 1981                     }
 1982                     nop->nfso_opencnt = 0;
 1983                     nop->nfso_posixlock = 1;
 1984                     nop->nfso_fhlen = dp->nfsdl_fhlen;
 1985                     NFSBCOPY(dp->nfsdl_fh, nop->nfso_fh, dp->nfsdl_fhlen);
 1986                     LIST_INIT(&nop->nfso_lock);
 1987                     nop->nfso_stateid.seqid = 0;
 1988                     nop->nfso_stateid.other[0] = 0;
 1989                     nop->nfso_stateid.other[1] = 0;
 1990                     nop->nfso_stateid.other[2] = 0;
 1991                     newnfs_copycred(&dp->nfsdl_cred, tcred);
 1992                     newnfs_copyincred(tcred, &nop->nfso_cred);
 1993                     tdp = NULL;
 1994                     error = nfscl_tryopen(nmp, NULL, nop->nfso_fh,
 1995                         nop->nfso_fhlen, nop->nfso_fh, nop->nfso_fhlen,
 1996                         nop->nfso_mode, nop, NULL, 0, &tdp, 1,
 1997                         delegtype, tcred, p);
 1998                     if (tdp != NULL) {
 1999                         if ((tdp->nfsdl_flags & NFSCLDL_WRITE))
 2000                             mode = NFSV4OPEN_ACCESSWRITE;
 2001                         else
 2002                             mode = NFSV4OPEN_ACCESSREAD;
 2003                         if ((nop->nfso_mode & mode) == mode &&
 2004                             nop->nfso_fhlen == tdp->nfsdl_fhlen &&
 2005                             !NFSBCMP(nop->nfso_fh, tdp->nfsdl_fh,
 2006                             nop->nfso_fhlen)) {
 2007                             dp->nfsdl_stateid = tdp->nfsdl_stateid;
 2008                             dp->nfsdl_sizelimit = tdp->nfsdl_sizelimit;
 2009                             dp->nfsdl_ace = tdp->nfsdl_ace;
 2010                             dp->nfsdl_change = tdp->nfsdl_change;
 2011                             dp->nfsdl_flags &= ~NFSCLDL_NEEDRECLAIM;
 2012                             if ((tdp->nfsdl_flags & NFSCLDL_RECALL))
 2013                                 dp->nfsdl_flags |= NFSCLDL_RECALL;
 2014                             FREE((caddr_t)tdp, M_NFSCLDELEG);
 2015                         } else {
 2016                             TAILQ_INSERT_HEAD(&extra_deleg, tdp, nfsdl_list);
 2017                         }
 2018                     }
 2019                 }
 2020                 if (error) {
 2021                     if (nop != NULL)
 2022                         FREE((caddr_t)nop, M_NFSCLOPEN);
 2023                     /*
 2024                      * Couldn't reclaim it, so throw the state
 2025                      * away. Ouch!!
 2026                      */
 2027                     nfscl_cleandeleg(dp);
 2028                     nfscl_freedeleg(&clp->nfsc_deleg, dp);
 2029                 } else {
 2030                     LIST_INSERT_HEAD(&extra_open, nop, nfso_list);
 2031                 }
 2032             }
 2033             dp = ndp;
 2034         }
 2035 
 2036         /*
 2037          * Now, get rid of extra Opens and Delegations.
 2038          */
 2039         LIST_FOREACH_SAFE(op, &extra_open, nfso_list, nop) {
 2040                 do {
 2041                         newnfs_copycred(&op->nfso_cred, tcred);
 2042                         error = nfscl_tryclose(op, tcred, nmp, p);
 2043                         if (error == NFSERR_GRACE)
 2044                                 (void) nfs_catnap(PZERO, "nfsexcls");
 2045                 } while (error == NFSERR_GRACE);
 2046                 LIST_REMOVE(op, nfso_list);
 2047                 FREE((caddr_t)op, M_NFSCLOPEN);
 2048         }
 2049         if (nowp != NULL)
 2050                 FREE((caddr_t)nowp, M_NFSCLOWNER);
 2051 
 2052         TAILQ_FOREACH_SAFE(dp, &extra_deleg, nfsdl_list, ndp) {
 2053                 do {
 2054                         newnfs_copycred(&dp->nfsdl_cred, tcred);
 2055                         error = nfscl_trydelegreturn(dp, tcred, nmp, p);
 2056                         if (error == NFSERR_GRACE)
 2057                                 (void) nfs_catnap(PZERO, "nfsexdlg");
 2058                 } while (error == NFSERR_GRACE);
 2059                 TAILQ_REMOVE(&extra_deleg, dp, nfsdl_list);
 2060                 FREE((caddr_t)dp, M_NFSCLDELEG);
 2061         }
 2062 
 2063         NFSLOCKCLSTATE();
 2064         nfsv4_unlock(&clp->nfsc_lock, 0);
 2065         NFSUNLOCKCLSTATE();
 2066         NFSFREECRED(tcred);
 2067 }
 2068 
 2069 /*
 2070  * This function is called when a server replies with NFSERR_EXPIRED.
 2071  * It deletes all state for the client and does a fresh SetClientId/confirm.
 2072  * XXX Someday it should post a signal to the process(es) that hold the
 2073  * state, so they know that lock state has been lost.
 2074  */
 2075 APPLESTATIC int
 2076 nfscl_hasexpired(struct nfsclclient *clp, u_int32_t clidrev, NFSPROC_T *p)
 2077 {
 2078         struct nfscllockowner *lp, *nlp;
 2079         struct nfsmount *nmp;
 2080         struct ucred *cred;
 2081         int igotlock = 0, error, trycnt;
 2082 
 2083         /*
 2084          * If the clientid has gone away or a new SetClientid has already
 2085          * been done, just return ok.
 2086          */
 2087         if (clp == NULL || clidrev != clp->nfsc_clientidrev)
 2088                 return (0);
 2089 
 2090         /*
 2091          * First, lock the client structure, so everyone else will
 2092          * block when trying to use state. Also, use NFSCLFLAGS_EXPIREIT so
 2093          * that only one thread does the work.
 2094          */
 2095         NFSLOCKCLSTATE();
 2096         clp->nfsc_flags |= NFSCLFLAGS_EXPIREIT;
 2097         do {
 2098                 igotlock = nfsv4_lock(&clp->nfsc_lock, 1, NULL,
 2099                     NFSCLSTATEMUTEXPTR);
 2100         } while (!igotlock && (clp->nfsc_flags & NFSCLFLAGS_EXPIREIT));
 2101         if ((clp->nfsc_flags & NFSCLFLAGS_EXPIREIT) == 0) {
 2102                 if (igotlock)
 2103                         nfsv4_unlock(&clp->nfsc_lock, 0);
 2104                 NFSUNLOCKCLSTATE();
 2105                 return (0);
 2106         }
 2107         NFSUNLOCKCLSTATE();
 2108 
 2109         nmp = clp->nfsc_nmp;
 2110         if (nmp == NULL)
 2111                 panic("nfscl expired");
 2112         cred = newnfs_getcred();
 2113         trycnt = 5;
 2114         do {
 2115                 error = nfsrpc_setclient(nmp, clp, cred, p);
 2116         } while ((error == NFSERR_STALECLIENTID ||
 2117              error == NFSERR_STALEDONTRECOVER) && --trycnt > 0);
 2118         if (error) {
 2119                 /*
 2120                  * Clear out any state.
 2121                  */
 2122                 nfscl_cleanclient(clp);
 2123                 clp->nfsc_flags &= ~(NFSCLFLAGS_HASCLIENTID |
 2124                     NFSCLFLAGS_RECOVER);
 2125         } else {
 2126                 /* get rid of defunct lockowners */
 2127                 LIST_FOREACH_SAFE(lp, &clp->nfsc_defunctlockowner, nfsl_list,
 2128                     nlp) {
 2129                         nfscl_freelockowner(lp, 0);
 2130                 }
 2131 
 2132                 /*
 2133                  * Expire the state for the client.
 2134                  */
 2135                 nfscl_expireclient(clp, nmp, cred, p);
 2136                 clp->nfsc_flags |= NFSCLFLAGS_HASCLIENTID;
 2137                 clp->nfsc_flags &= ~NFSCLFLAGS_RECOVER;
 2138         }
 2139         NFSFREECRED(cred);
 2140         clp->nfsc_flags &= ~NFSCLFLAGS_EXPIREIT;
 2141         NFSLOCKCLSTATE();
 2142         nfsv4_unlock(&clp->nfsc_lock, 0);
 2143         NFSUNLOCKCLSTATE();
 2144         return (error);
 2145 }
 2146 
 2147 /*
 2148  * This function inserts a lock in the list after insert_lop.
 2149  */
 2150 static void
 2151 nfscl_insertlock(struct nfscllockowner *lp, struct nfscllock *new_lop,
 2152     struct nfscllock *insert_lop, int local)
 2153 {
 2154 
 2155         if ((struct nfscllockowner *)insert_lop == lp)
 2156                 LIST_INSERT_HEAD(&lp->nfsl_lock, new_lop, nfslo_list);
 2157         else
 2158                 LIST_INSERT_AFTER(insert_lop, new_lop, nfslo_list);
 2159         if (local)
 2160                 newnfsstats.cllocallocks++;
 2161         else
 2162                 newnfsstats.cllocks++;
 2163 }
 2164 
 2165 /*
 2166  * This function updates the locking for a lock owner and given file. It
 2167  * maintains a list of lock ranges ordered on increasing file offset that
 2168  * are NFSCLLOCK_READ or NFSCLLOCK_WRITE and non-overlapping (aka POSIX style).
 2169  * It always adds new_lop to the list and sometimes uses the one pointed
 2170  * at by other_lopp.
 2171  * Returns 1 if the locks were modified, 0 otherwise.
 2172  */
 2173 static int
 2174 nfscl_updatelock(struct nfscllockowner *lp, struct nfscllock **new_lopp,
 2175     struct nfscllock **other_lopp, int local)
 2176 {
 2177         struct nfscllock *new_lop = *new_lopp;
 2178         struct nfscllock *lop, *tlop, *ilop;
 2179         struct nfscllock *other_lop;
 2180         int unlock = 0, modified = 0;
 2181         u_int64_t tmp;
 2182 
 2183         /*
 2184          * Work down the list until the lock is merged.
 2185          */
 2186         if (new_lop->nfslo_type == F_UNLCK)
 2187                 unlock = 1;
 2188         ilop = (struct nfscllock *)lp;
 2189         lop = LIST_FIRST(&lp->nfsl_lock);
 2190         while (lop != NULL) {
 2191             /*
 2192              * Only check locks for this file that aren't before the start of
 2193              * new lock's range.
 2194              */
 2195             if (lop->nfslo_end >= new_lop->nfslo_first) {
 2196                 if (new_lop->nfslo_end < lop->nfslo_first) {
 2197                     /*
 2198                      * If the new lock ends before the start of the
 2199                      * current lock's range, no merge, just insert
 2200                      * the new lock.
 2201                      */
 2202                     break;
 2203                 }
 2204                 if (new_lop->nfslo_type == lop->nfslo_type ||
 2205                     (new_lop->nfslo_first <= lop->nfslo_first &&
 2206                      new_lop->nfslo_end >= lop->nfslo_end)) {
 2207                     /*
 2208                      * This lock can be absorbed by the new lock/unlock.
 2209                      * This happens when it covers the entire range
 2210                      * of the old lock or is contiguous
 2211                      * with the old lock and is of the same type or an
 2212                      * unlock.
 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                         modified = 1;
 2218                     if (lop->nfslo_first < new_lop->nfslo_first)
 2219                         new_lop->nfslo_first = lop->nfslo_first;
 2220                     if (lop->nfslo_end > new_lop->nfslo_end)
 2221                         new_lop->nfslo_end = lop->nfslo_end;
 2222                     tlop = lop;
 2223                     lop = LIST_NEXT(lop, nfslo_list);
 2224                     nfscl_freelock(tlop, local);
 2225                     continue;
 2226                 }
 2227 
 2228                 /*
 2229                  * All these cases are for contiguous locks that are not the
 2230                  * same type, so they can't be merged.
 2231                  */
 2232                 if (new_lop->nfslo_first <= lop->nfslo_first) {
 2233                     /*
 2234                      * This case is where the new lock overlaps with the
 2235                      * first part of the old lock. Move the start of the
 2236                      * old lock to just past the end of the new lock. The
 2237                      * new lock will be inserted in front of the old, since
 2238                      * ilop hasn't been updated. (We are done now.)
 2239                      */
 2240                     if (lop->nfslo_first != new_lop->nfslo_end) {
 2241                         lop->nfslo_first = new_lop->nfslo_end;
 2242                         modified = 1;
 2243                     }
 2244                     break;
 2245                 }
 2246                 if (new_lop->nfslo_end >= lop->nfslo_end) {
 2247                     /*
 2248                      * This case is where the new lock overlaps with the
 2249                      * end of the old lock's range. Move the old lock's
 2250                      * end to just before the new lock's first and insert
 2251                      * the new lock after the old lock.
 2252                      * Might not be done yet, since the new lock could
 2253                      * overlap further locks with higher ranges.
 2254                      */
 2255                     if (lop->nfslo_end != new_lop->nfslo_first) {
 2256                         lop->nfslo_end = new_lop->nfslo_first;
 2257                         modified = 1;
 2258                     }
 2259                     ilop = lop;
 2260                     lop = LIST_NEXT(lop, nfslo_list);
 2261                     continue;
 2262                 }
 2263                 /*
 2264                  * The final case is where the new lock's range is in the
 2265                  * middle of the current lock's and splits the current lock
 2266                  * up. Use *other_lopp to handle the second part of the
 2267                  * split old lock range. (We are done now.)
 2268                  * For unlock, we use new_lop as other_lop and tmp, since
 2269                  * other_lop and new_lop are the same for this case.
 2270                  * We noted the unlock case above, so we don't need
 2271                  * new_lop->nfslo_type any longer.
 2272                  */
 2273                 tmp = new_lop->nfslo_first;
 2274                 if (unlock) {
 2275                     other_lop = new_lop;
 2276                     *new_lopp = NULL;
 2277                 } else {
 2278                     other_lop = *other_lopp;
 2279                     *other_lopp = NULL;
 2280                 }
 2281                 other_lop->nfslo_first = new_lop->nfslo_end;
 2282                 other_lop->nfslo_end = lop->nfslo_end;
 2283                 other_lop->nfslo_type = lop->nfslo_type;
 2284                 lop->nfslo_end = tmp;
 2285                 nfscl_insertlock(lp, other_lop, lop, local);
 2286                 ilop = lop;
 2287                 modified = 1;
 2288                 break;
 2289             }
 2290             ilop = lop;
 2291             lop = LIST_NEXT(lop, nfslo_list);
 2292             if (lop == NULL)
 2293                 break;
 2294         }
 2295 
 2296         /*
 2297          * Insert the new lock in the list at the appropriate place.
 2298          */
 2299         if (!unlock) {
 2300                 nfscl_insertlock(lp, new_lop, ilop, local);
 2301                 *new_lopp = NULL;
 2302                 modified = 1;
 2303         }
 2304         return (modified);
 2305 }
 2306 
 2307 /*
 2308  * This function must be run as a kernel thread.
 2309  * It does Renew Ops and recovery, when required.
 2310  */
 2311 APPLESTATIC void
 2312 nfscl_renewthread(struct nfsclclient *clp, NFSPROC_T *p)
 2313 {
 2314         struct nfsclowner *owp, *nowp;
 2315         struct nfsclopen *op;
 2316         struct nfscllockowner *lp, *nlp, *olp;
 2317         struct nfscldeleghead dh;
 2318         struct nfscllockownerhead lh;
 2319         struct nfscldeleg *dp, *ndp;
 2320         struct ucred *cred;
 2321         u_int32_t clidrev;
 2322         int error, cbpathdown, islept, igotlock, ret, clearok;
 2323 
 2324         cred = newnfs_getcred();
 2325         clp->nfsc_flags |= NFSCLFLAGS_HASTHREAD;
 2326         for(;;) {
 2327                 newnfs_setroot(cred);
 2328                 cbpathdown = 0;
 2329                 if (clp->nfsc_flags & NFSCLFLAGS_RECOVER)
 2330                         nfscl_recover(clp, cred, p);
 2331                 if (clp->nfsc_expire <= NFSD_MONOSEC &&
 2332                     (clp->nfsc_flags & NFSCLFLAGS_HASCLIENTID)) {
 2333                         clp->nfsc_expire = NFSD_MONOSEC + clp->nfsc_renew;
 2334                         clidrev = clp->nfsc_clientidrev;
 2335                         error = nfsrpc_renew(clp, cred, p);
 2336                         if (error == NFSERR_CBPATHDOWN)
 2337                             cbpathdown = 1;
 2338                         else if (error == NFSERR_STALECLIENTID)
 2339                             clp->nfsc_flags |= NFSCLFLAGS_RECOVER;
 2340                         else if (error == NFSERR_EXPIRED)
 2341                             (void) nfscl_hasexpired(clp, clidrev, p);
 2342                 }
 2343 
 2344                 LIST_INIT(&lh);
 2345                 TAILQ_INIT(&dh);
 2346                 NFSLOCKCLSTATE();
 2347                 if (cbpathdown)
 2348                         /* It's a Total Recall! */
 2349                         nfscl_totalrecall(clp);
 2350 
 2351                 /*
 2352                  * Now, handle defunct owners.
 2353                  */
 2354                 owp = LIST_FIRST(&clp->nfsc_owner);
 2355                 while (owp != NULL) {
 2356                     nowp = LIST_NEXT(owp, nfsow_list);
 2357                     if (LIST_EMPTY(&owp->nfsow_open)) {
 2358                         if (owp->nfsow_defunct)
 2359                             nfscl_freeopenowner(owp, 0);
 2360                     } else {
 2361                         LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 2362                             lp = LIST_FIRST(&op->nfso_lock);
 2363                             while (lp != NULL) {
 2364                                 nlp = LIST_NEXT(lp, nfsl_list);
 2365                                 if (lp->nfsl_defunct &&
 2366                                     LIST_EMPTY(&lp->nfsl_lock)) {
 2367                                     LIST_FOREACH(olp, &lh, nfsl_list) {
 2368                                         if (!NFSBCMP(olp->nfsl_owner,
 2369                                             lp->nfsl_owner,NFSV4CL_LOCKNAMELEN))
 2370                                             break;
 2371                                     }
 2372                                     if (olp == NULL) {
 2373                                         LIST_REMOVE(lp, nfsl_list);
 2374                                         LIST_INSERT_HEAD(&lh, lp, nfsl_list);
 2375                                     } else {
 2376                                         nfscl_freelockowner(lp, 0);
 2377                                     }
 2378                                 }
 2379                                 lp = nlp;
 2380                             }
 2381                         }
 2382                     }
 2383                     owp = nowp;
 2384                 }
 2385 
 2386                 /* also search the defunct list */
 2387                 lp = LIST_FIRST(&clp->nfsc_defunctlockowner);
 2388                 while (lp != NULL) {
 2389                     nlp = LIST_NEXT(lp, nfsl_list);
 2390                     if (lp->nfsl_defunct) {
 2391                         LIST_FOREACH(olp, &lh, nfsl_list) {
 2392                             if (!NFSBCMP(olp->nfsl_owner, lp->nfsl_owner,
 2393                                 NFSV4CL_LOCKNAMELEN))
 2394                                 break;
 2395                         }
 2396                         if (olp == NULL) {
 2397                             LIST_REMOVE(lp, nfsl_list);
 2398                             LIST_INSERT_HEAD(&lh, lp, nfsl_list);
 2399                         } else {
 2400                             nfscl_freelockowner(lp, 0);
 2401                         }
 2402                     }
 2403                     lp = nlp;
 2404                 }
 2405                 /* and release defunct lock owners */
 2406                 LIST_FOREACH_SAFE(lp, &lh, nfsl_list, nlp) {
 2407                     nfscl_freelockowner(lp, 0);
 2408                 }
 2409 
 2410                 /*
 2411                  * Do the recall on any delegations. To avoid trouble, always
 2412                  * come back up here after having slept.
 2413                  */
 2414                 igotlock = 0;
 2415 tryagain:
 2416                 dp = TAILQ_FIRST(&clp->nfsc_deleg);
 2417                 while (dp != NULL) {
 2418                         ndp = TAILQ_NEXT(dp, nfsdl_list);
 2419                         if ((dp->nfsdl_flags & NFSCLDL_RECALL)) {
 2420                                 /*
 2421                                  * Wait for outstanding I/O ops to be done.
 2422                                  */
 2423                                 if (dp->nfsdl_rwlock.nfslock_usecnt > 0) {
 2424                                     if (igotlock) {
 2425                                         nfsv4_unlock(&clp->nfsc_lock, 0);
 2426                                         igotlock = 0;
 2427                                     }
 2428                                     dp->nfsdl_rwlock.nfslock_lock |=
 2429                                         NFSV4LOCK_WANTED;
 2430                                     (void) nfsmsleep(&dp->nfsdl_rwlock,
 2431                                         NFSCLSTATEMUTEXPTR, PZERO, "nfscld",
 2432                                         NULL);
 2433                                     goto tryagain;
 2434                                 }
 2435                                 while (!igotlock) {
 2436                                     igotlock = nfsv4_lock(&clp->nfsc_lock, 1,
 2437                                         &islept, NFSCLSTATEMUTEXPTR);
 2438                                     if (islept)
 2439                                         goto tryagain;
 2440                                 }
 2441                                 NFSUNLOCKCLSTATE();
 2442                                 newnfs_copycred(&dp->nfsdl_cred, cred);
 2443                                 ret = nfscl_recalldeleg(clp, clp->nfsc_nmp, dp,
 2444                                     NULL, cred, p);
 2445                                 if (!ret) {
 2446                                     nfscl_cleandeleg(dp);
 2447                                     TAILQ_REMOVE(&clp->nfsc_deleg, dp,
 2448                                         nfsdl_list);
 2449                                     LIST_REMOVE(dp, nfsdl_hash);
 2450                                     TAILQ_INSERT_HEAD(&dh, dp, nfsdl_list);
 2451                                     nfscl_delegcnt--;
 2452                                     newnfsstats.cldelegates--;
 2453                                 }
 2454                                 NFSLOCKCLSTATE();
 2455                         }
 2456                         dp = ndp;
 2457                 }
 2458 
 2459                 /*
 2460                  * Clear out old delegations, if we are above the high water
 2461                  * mark. Only clear out ones with no state related to them.
 2462                  * The tailq list is in LRU order.
 2463                  */
 2464                 dp = TAILQ_LAST(&clp->nfsc_deleg, nfscldeleghead);
 2465                 while (nfscl_delegcnt > nfscl_deleghighwater && dp != NULL) {
 2466                     ndp = TAILQ_PREV(dp, nfscldeleghead, nfsdl_list);
 2467                     if (dp->nfsdl_rwlock.nfslock_usecnt == 0 &&
 2468                         dp->nfsdl_rwlock.nfslock_lock == 0 &&
 2469                         dp->nfsdl_timestamp < NFSD_MONOSEC &&
 2470                         !(dp->nfsdl_flags & (NFSCLDL_RECALL | NFSCLDL_ZAPPED |
 2471                           NFSCLDL_NEEDRECLAIM))) {
 2472                         clearok = 1;
 2473                         LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
 2474                             op = LIST_FIRST(&owp->nfsow_open);
 2475                             if (op != NULL) {
 2476                                 clearok = 0;
 2477                                 break;
 2478                             }
 2479                         }
 2480                         if (clearok) {
 2481                             LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
 2482                                 if (!LIST_EMPTY(&lp->nfsl_lock)) {
 2483                                     clearok = 0;
 2484                                     break;
 2485                                 }
 2486                             }
 2487                         }
 2488                         if (clearok) {
 2489                             TAILQ_REMOVE(&clp->nfsc_deleg, dp, nfsdl_list);
 2490                             LIST_REMOVE(dp, nfsdl_hash);
 2491                             TAILQ_INSERT_HEAD(&dh, dp, nfsdl_list);
 2492                             nfscl_delegcnt--;
 2493                             newnfsstats.cldelegates--;
 2494                         }
 2495                     }
 2496                     dp = ndp;
 2497                 }
 2498                 if (igotlock)
 2499                         nfsv4_unlock(&clp->nfsc_lock, 0);
 2500                 NFSUNLOCKCLSTATE();
 2501 
 2502                 /*
 2503                  * Delegreturn any delegations cleaned out or recalled.
 2504                  */
 2505                 TAILQ_FOREACH_SAFE(dp, &dh, nfsdl_list, ndp) {
 2506                         newnfs_copycred(&dp->nfsdl_cred, cred);
 2507                         (void) nfscl_trydelegreturn(dp, cred, clp->nfsc_nmp, p);
 2508                         TAILQ_REMOVE(&dh, dp, nfsdl_list);
 2509                         FREE((caddr_t)dp, M_NFSCLDELEG);
 2510                 }
 2511 
 2512 #if defined(APPLEKEXT) || defined(__FreeBSD__)
 2513                 /*
 2514                  * Simulate the calls to nfscl_cleanup() when a process
 2515                  * exits, since the call can't be patched into exit().
 2516                  */
 2517                 {
 2518                         struct timespec mytime;
 2519                         static time_t prevsec = 0;
 2520 
 2521                         NFSGETNANOTIME(&mytime);
 2522                         if (prevsec != mytime.tv_sec) {
 2523                                 prevsec = mytime.tv_sec;
 2524                                 nfscl_cleanupkext(clp);
 2525                         }
 2526                 }
 2527 #endif  /* APPLEKEXT || __FreeBSD__ */
 2528 
 2529                 if ((clp->nfsc_flags & NFSCLFLAGS_RECOVER) == 0)
 2530                     (void) tsleep((caddr_t)clp, PWAIT, "nfscl", hz);
 2531                 if (clp->nfsc_flags & NFSCLFLAGS_UMOUNT) {
 2532                         NFSFREECRED(cred);
 2533                         clp->nfsc_flags &= ~NFSCLFLAGS_HASTHREAD;
 2534                         wakeup((caddr_t)clp);
 2535                         return;
 2536                 }
 2537         }
 2538 }
 2539 
 2540 /*
 2541  * Initiate state recovery. Called when NFSERR_STALECLIENTID or
 2542  * NFSERR_STALESTATEID is received.
 2543  */
 2544 APPLESTATIC void
 2545 nfscl_initiate_recovery(struct nfsclclient *clp)
 2546 {
 2547 
 2548         if (clp == NULL)
 2549                 return;
 2550         NFSLOCKCLSTATE();
 2551         clp->nfsc_flags |= NFSCLFLAGS_RECOVER;
 2552         NFSUNLOCKCLSTATE();
 2553         wakeup((caddr_t)clp);
 2554 }
 2555 
 2556 /*
 2557  * Dump out the state stuff for debugging.
 2558  */
 2559 APPLESTATIC void
 2560 nfscl_dumpstate(struct nfsmount *nmp, int openowner, int opens,
 2561     int lockowner, int locks)
 2562 {
 2563         struct nfsclclient *clp;
 2564         struct nfsclowner *owp;
 2565         struct nfsclopen *op;
 2566         struct nfscllockowner *lp;
 2567         struct nfscllock *lop;
 2568         struct nfscldeleg *dp;
 2569 
 2570         clp = nmp->nm_clp;
 2571         if (clp == NULL) {
 2572                 printf("nfscl dumpstate NULL clp\n");
 2573                 return;
 2574         }
 2575         NFSLOCKCLSTATE();
 2576         TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
 2577           LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
 2578             if (openowner && !LIST_EMPTY(&owp->nfsow_open))
 2579                 printf("owner=0x%x 0x%x 0x%x 0x%x seqid=%d\n",
 2580                     owp->nfsow_owner[0], owp->nfsow_owner[1],
 2581                     owp->nfsow_owner[2], owp->nfsow_owner[3],
 2582                     owp->nfsow_seqid);
 2583             LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 2584                 if (opens)
 2585                     printf("open st=0x%x 0x%x 0x%x cnt=%d fh12=0x%x\n",
 2586                         op->nfso_stateid.other[0], op->nfso_stateid.other[1],
 2587                         op->nfso_stateid.other[2], op->nfso_opencnt,
 2588                         op->nfso_fh[12]);
 2589                 LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
 2590                     if (lockowner)
 2591                         printf("lckown=0x%x 0x%x 0x%x 0x%x seqid=%d st=0x%x 0x%x 0x%x\n",
 2592                             lp->nfsl_owner[0], lp->nfsl_owner[1],
 2593                             lp->nfsl_owner[2], lp->nfsl_owner[3],
 2594                             lp->nfsl_seqid,
 2595                             lp->nfsl_stateid.other[0], lp->nfsl_stateid.other[1],
 2596                             lp->nfsl_stateid.other[2]);
 2597                     LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
 2598                         if (locks)
 2599 #ifdef __FreeBSD__
 2600                             printf("lck typ=%d fst=%ju end=%ju\n",
 2601                                 lop->nfslo_type, (intmax_t)lop->nfslo_first,
 2602                                 (intmax_t)lop->nfslo_end);
 2603 #else
 2604                             printf("lck typ=%d fst=%qd end=%qd\n",
 2605                                 lop->nfslo_type, lop->nfslo_first,
 2606                                 lop->nfslo_end);
 2607 #endif
 2608                     }
 2609                 }
 2610             }
 2611           }
 2612         }
 2613         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 2614             if (openowner && !LIST_EMPTY(&owp->nfsow_open))
 2615                 printf("owner=0x%x 0x%x 0x%x 0x%x seqid=%d\n",
 2616                     owp->nfsow_owner[0], owp->nfsow_owner[1],
 2617                     owp->nfsow_owner[2], owp->nfsow_owner[3],
 2618                     owp->nfsow_seqid);
 2619             LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 2620                 if (opens)
 2621                     printf("open st=0x%x 0x%x 0x%x cnt=%d fh12=0x%x\n",
 2622                         op->nfso_stateid.other[0], op->nfso_stateid.other[1],
 2623                         op->nfso_stateid.other[2], op->nfso_opencnt,
 2624                         op->nfso_fh[12]);
 2625                 LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
 2626                     if (lockowner)
 2627                         printf("lckown=0x%x 0x%x 0x%x 0x%x seqid=%d st=0x%x 0x%x 0x%x\n",
 2628                             lp->nfsl_owner[0], lp->nfsl_owner[1],
 2629                             lp->nfsl_owner[2], lp->nfsl_owner[3],
 2630                             lp->nfsl_seqid,
 2631                             lp->nfsl_stateid.other[0], lp->nfsl_stateid.other[1],
 2632                             lp->nfsl_stateid.other[2]);
 2633                     LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
 2634                         if (locks)
 2635 #ifdef __FreeBSD__
 2636                             printf("lck typ=%d fst=%ju end=%ju\n",
 2637                                 lop->nfslo_type, (intmax_t)lop->nfslo_first,
 2638                                 (intmax_t)lop->nfslo_end);
 2639 #else
 2640                             printf("lck typ=%d fst=%qd end=%qd\n",
 2641                                 lop->nfslo_type, lop->nfslo_first,
 2642                                 lop->nfslo_end);
 2643 #endif
 2644                     }
 2645                 }
 2646             }
 2647         }
 2648         NFSUNLOCKCLSTATE();
 2649 }
 2650 
 2651 /*
 2652  * Check for duplicate open owners and opens.
 2653  * (Only used as a diagnostic aid.)
 2654  */
 2655 APPLESTATIC void
 2656 nfscl_dupopen(vnode_t vp, int dupopens)
 2657 {
 2658         struct nfsclclient *clp;
 2659         struct nfsclowner *owp, *owp2;
 2660         struct nfsclopen *op, *op2;
 2661         struct nfsfh *nfhp;
 2662 
 2663         clp = VFSTONFS(vnode_mount(vp))->nm_clp;
 2664         if (clp == NULL) {
 2665                 printf("nfscl dupopen NULL clp\n");
 2666                 return;
 2667         }
 2668         nfhp = VTONFS(vp)->n_fhp;
 2669         NFSLOCKCLSTATE();
 2670 
 2671         /*
 2672          * First, search for duplicate owners.
 2673          * These should never happen!
 2674          */
 2675         LIST_FOREACH(owp2, &clp->nfsc_owner, nfsow_list) {
 2676             LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 2677                 if (owp != owp2 &&
 2678                     !NFSBCMP(owp->nfsow_owner, owp2->nfsow_owner,
 2679                     NFSV4CL_LOCKNAMELEN)) {
 2680                         NFSUNLOCKCLSTATE();
 2681                         printf("DUP OWNER\n");
 2682                         nfscl_dumpstate(VFSTONFS(vnode_mount(vp)), 1, 1, 0, 0);
 2683                         return;
 2684                 }
 2685             }
 2686         }
 2687 
 2688         /*
 2689          * Now, search for duplicate stateids.
 2690          * These shouldn't happen, either.
 2691          */
 2692         LIST_FOREACH(owp2, &clp->nfsc_owner, nfsow_list) {
 2693             LIST_FOREACH(op2, &owp2->nfsow_open, nfso_list) {
 2694                 LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 2695                     LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 2696                         if (op != op2 &&
 2697                             (op->nfso_stateid.other[0] != 0 ||
 2698                              op->nfso_stateid.other[1] != 0 ||
 2699                              op->nfso_stateid.other[2] != 0) &&
 2700                             op->nfso_stateid.other[0] == op2->nfso_stateid.other[0] &&
 2701                             op->nfso_stateid.other[1] == op2->nfso_stateid.other[1] &&
 2702                             op->nfso_stateid.other[2] == op2->nfso_stateid.other[2]) {
 2703                             NFSUNLOCKCLSTATE();
 2704                             printf("DUP STATEID\n");
 2705                             nfscl_dumpstate(VFSTONFS(vnode_mount(vp)), 1, 1, 0,
 2706                                 0);
 2707                             return;
 2708                         }
 2709                     }
 2710                 }
 2711             }
 2712         }
 2713 
 2714         /*
 2715          * Now search for duplicate opens.
 2716          * Duplicate opens for the same owner
 2717          * should never occur. Other duplicates are
 2718          * possible and are checked for if "dupopens"
 2719          * is true.
 2720          */
 2721         LIST_FOREACH(owp2, &clp->nfsc_owner, nfsow_list) {
 2722             LIST_FOREACH(op2, &owp2->nfsow_open, nfso_list) {
 2723                 if (nfhp->nfh_len == op2->nfso_fhlen &&
 2724                     !NFSBCMP(nfhp->nfh_fh, op2->nfso_fh, nfhp->nfh_len)) {
 2725                     LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 2726                         LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 2727                             if (op != op2 && nfhp->nfh_len == op->nfso_fhlen &&
 2728                                 !NFSBCMP(nfhp->nfh_fh, op->nfso_fh, nfhp->nfh_len) &&
 2729                                 (!NFSBCMP(op->nfso_own->nfsow_owner,
 2730                                  op2->nfso_own->nfsow_owner, NFSV4CL_LOCKNAMELEN) ||
 2731                                  dupopens)) {
 2732                                 if (!NFSBCMP(op->nfso_own->nfsow_owner,
 2733                                     op2->nfso_own->nfsow_owner, NFSV4CL_LOCKNAMELEN)) {
 2734                                     NFSUNLOCKCLSTATE();
 2735                                     printf("BADDUP OPEN\n");
 2736                                 } else {
 2737                                     NFSUNLOCKCLSTATE();
 2738                                     printf("DUP OPEN\n");
 2739                                 }
 2740                                 nfscl_dumpstate(VFSTONFS(vnode_mount(vp)), 1, 1,
 2741                                     0, 0);
 2742                                 return;
 2743                             }
 2744                         }
 2745                     }
 2746                 }
 2747             }
 2748         }
 2749         NFSUNLOCKCLSTATE();
 2750 }
 2751 
 2752 /*
 2753  * During close, find an open that needs to be dereferenced and
 2754  * dereference it. If there are no more opens for this file,
 2755  * log a message to that effect.
 2756  * Opens aren't actually Close'd until VOP_INACTIVE() is performed
 2757  * on the file's vnode.
 2758  * This is the safe way, since it is difficult to identify
 2759  * which open the close is for and I/O can be performed after the
 2760  * close(2) system call when a file is mmap'd.
 2761  * If it returns 0 for success, there will be a referenced
 2762  * clp returned via clpp.
 2763  */
 2764 APPLESTATIC int
 2765 nfscl_getclose(vnode_t vp, struct nfsclclient **clpp)
 2766 {
 2767         struct nfsclclient *clp;
 2768         struct nfsclowner *owp;
 2769         struct nfsclopen *op;
 2770         struct nfscldeleg *dp;
 2771         struct nfsfh *nfhp;
 2772         int error, notdecr;
 2773 
 2774         error = nfscl_getcl(vp, NULL, NULL, &clp);
 2775         if (error)
 2776                 return (error);
 2777         *clpp = clp;
 2778 
 2779         nfhp = VTONFS(vp)->n_fhp;
 2780         notdecr = 1;
 2781         NFSLOCKCLSTATE();
 2782         /*
 2783          * First, look for one under a delegation that was locally issued
 2784          * and just decrement the opencnt for it. Since all my Opens against
 2785          * the server are DENY_NONE, I don't see a problem with hanging
 2786          * onto them. (It is much easier to use one of the extant Opens
 2787          * that I already have on the server when a Delegation is recalled
 2788          * than to do fresh Opens.) Someday, I might need to rethink this, but.
 2789          */
 2790         dp = nfscl_finddeleg(clp, nfhp->nfh_fh, nfhp->nfh_len);
 2791         if (dp != NULL) {
 2792                 LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
 2793                         op = LIST_FIRST(&owp->nfsow_open);
 2794                         if (op != NULL) {
 2795                                 /*
 2796                                  * Since a delegation is for a file, there
 2797                                  * should never be more than one open for
 2798                                  * each openowner.
 2799                                  */
 2800                                 if (LIST_NEXT(op, nfso_list) != NULL)
 2801                                         panic("nfscdeleg opens");
 2802                                 if (notdecr && op->nfso_opencnt > 0) {
 2803                                         notdecr = 0;
 2804                                         op->nfso_opencnt--;
 2805                                         break;
 2806                                 }
 2807                         }
 2808                 }
 2809         }
 2810 
 2811         /* Now process the opens against the server. */
 2812         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 2813                 LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 2814                         if (op->nfso_fhlen == nfhp->nfh_len &&
 2815                             !NFSBCMP(op->nfso_fh, nfhp->nfh_fh,
 2816                             nfhp->nfh_len)) {
 2817                                 /* Found an open, decrement cnt if possible */
 2818                                 if (notdecr && op->nfso_opencnt > 0) {
 2819                                         notdecr = 0;
 2820                                         op->nfso_opencnt--;
 2821                                 }
 2822                                 /*
 2823                                  * There are more opens, so just return.
 2824                                  */
 2825                                 if (op->nfso_opencnt > 0) {
 2826                                         NFSUNLOCKCLSTATE();
 2827                                         return (0);
 2828                                 }
 2829                         }
 2830                 }
 2831         }
 2832         NFSUNLOCKCLSTATE();
 2833         if (notdecr)
 2834                 printf("nfscl: never fnd open\n");
 2835         return (0);
 2836 }
 2837 
 2838 APPLESTATIC int
 2839 nfscl_doclose(vnode_t vp, struct nfsclclient **clpp, NFSPROC_T *p)
 2840 {
 2841         struct nfsclclient *clp;
 2842         struct nfsclowner *owp, *nowp;
 2843         struct nfsclopen *op;
 2844         struct nfscldeleg *dp;
 2845         struct nfsfh *nfhp;
 2846         int error;
 2847 
 2848         error = nfscl_getcl(vp, NULL, NULL, &clp);
 2849         if (error)
 2850                 return (error);
 2851         *clpp = clp;
 2852 
 2853         nfhp = VTONFS(vp)->n_fhp;
 2854         NFSLOCKCLSTATE();
 2855         /*
 2856          * First get rid of the local Open structures, which should be no
 2857          * longer in use.
 2858          */
 2859         dp = nfscl_finddeleg(clp, nfhp->nfh_fh, nfhp->nfh_len);
 2860         if (dp != NULL) {
 2861                 LIST_FOREACH_SAFE(owp, &dp->nfsdl_owner, nfsow_list, nowp) {
 2862                         op = LIST_FIRST(&owp->nfsow_open);
 2863                         if (op != NULL) {
 2864                                 KASSERT((op->nfso_opencnt == 0),
 2865                                     ("nfscl: bad open cnt on deleg"));
 2866                                 nfscl_freeopen(op, 1);
 2867                         }
 2868                         nfscl_freeopenowner(owp, 1);
 2869                 }
 2870         }
 2871 
 2872         /* Now process the opens against the server. */
 2873 lookformore:
 2874         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 2875                 op = LIST_FIRST(&owp->nfsow_open);
 2876                 while (op != NULL) {
 2877                         if (op->nfso_fhlen == nfhp->nfh_len &&
 2878                             !NFSBCMP(op->nfso_fh, nfhp->nfh_fh,
 2879                             nfhp->nfh_len)) {
 2880                                 /* Found an open, close it. */
 2881                                 KASSERT((op->nfso_opencnt == 0),
 2882                                     ("nfscl: bad open cnt on server"));
 2883                                 NFSUNLOCKCLSTATE();
 2884                                 nfsrpc_doclose(VFSTONFS(vnode_mount(vp)), op,
 2885                                     p);
 2886                                 NFSLOCKCLSTATE();
 2887                                 goto lookformore;
 2888                         }
 2889                         op = LIST_NEXT(op, nfso_list);
 2890                 }
 2891         }
 2892         NFSUNLOCKCLSTATE();
 2893         return (0);
 2894 }
 2895 
 2896 /*
 2897  * Return all delegations on this client.
 2898  * (Must be called with client sleep lock.)
 2899  */
 2900 static void
 2901 nfscl_delegreturnall(struct nfsclclient *clp, NFSPROC_T *p)
 2902 {
 2903         struct nfscldeleg *dp, *ndp;
 2904         struct ucred *cred;
 2905 
 2906         cred = newnfs_getcred();
 2907         TAILQ_FOREACH_SAFE(dp, &clp->nfsc_deleg, nfsdl_list, ndp) {
 2908                 nfscl_cleandeleg(dp);
 2909                 (void) nfscl_trydelegreturn(dp, cred, clp->nfsc_nmp, p);
 2910                 nfscl_freedeleg(&clp->nfsc_deleg, dp);
 2911         }
 2912         NFSFREECRED(cred);
 2913 }
 2914 
 2915 /*
 2916  * Do a callback RPC.
 2917  */
 2918 APPLESTATIC void
 2919 nfscl_docb(struct nfsrv_descript *nd, NFSPROC_T *p)
 2920 {
 2921         int i, op;
 2922         u_int32_t *tl;
 2923         struct nfsclclient *clp;
 2924         struct nfscldeleg *dp = NULL;
 2925         int numops, taglen = -1, error = 0, trunc, ret = 0;
 2926         u_int32_t minorvers, retops = 0, *retopsp = NULL, *repp, cbident;
 2927         u_char tag[NFSV4_SMALLSTR + 1], *tagstr;
 2928         vnode_t vp = NULL;
 2929         struct nfsnode *np;
 2930         struct vattr va;
 2931         struct nfsfh *nfhp;
 2932         mount_t mp;
 2933         nfsattrbit_t attrbits, rattrbits;
 2934         nfsv4stateid_t stateid;
 2935 
 2936         nfsrvd_rephead(nd);
 2937         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2938         taglen = fxdr_unsigned(int, *tl);
 2939         if (taglen < 0) {
 2940                 error = EBADRPC;
 2941                 goto nfsmout;
 2942         }
 2943         if (taglen <= NFSV4_SMALLSTR)
 2944                 tagstr = tag;
 2945         else
 2946                 tagstr = malloc(taglen + 1, M_TEMP, M_WAITOK);
 2947         error = nfsrv_mtostr(nd, tagstr, taglen);
 2948         if (error) {
 2949                 if (taglen > NFSV4_SMALLSTR)
 2950                         free(tagstr, M_TEMP);
 2951                 taglen = -1;
 2952                 goto nfsmout;
 2953         }
 2954         (void) nfsm_strtom(nd, tag, taglen);
 2955         if (taglen > NFSV4_SMALLSTR) {
 2956                 free(tagstr, M_TEMP);
 2957         }
 2958         NFSM_BUILD(retopsp, u_int32_t *, NFSX_UNSIGNED);
 2959         NFSM_DISSECT(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
 2960         minorvers = fxdr_unsigned(u_int32_t, *tl++);
 2961         if (minorvers != NFSV4_MINORVERSION)
 2962                 nd->nd_repstat = NFSERR_MINORVERMISMATCH;
 2963         cbident = fxdr_unsigned(u_int32_t, *tl++);
 2964         if (nd->nd_repstat)
 2965                 numops = 0;
 2966         else
 2967                 numops = fxdr_unsigned(int, *tl);
 2968         /*
 2969          * Loop around doing the sub ops.
 2970          */
 2971         for (i = 0; i < numops; i++) {
 2972                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 2973                 NFSM_BUILD(repp, u_int32_t *, 2 * NFSX_UNSIGNED);
 2974                 *repp++ = *tl;
 2975                 op = fxdr_unsigned(int, *tl);
 2976                 if (op < NFSV4OP_CBGETATTR || op > NFSV4OP_CBRECALL) {
 2977                     nd->nd_repstat = NFSERR_OPILLEGAL;
 2978                     *repp = nfscl_errmap(nd);
 2979                     retops++;
 2980                     break;
 2981                 }
 2982                 nd->nd_procnum = op;
 2983                 newnfsstats.cbrpccnt[nd->nd_procnum]++;
 2984                 switch (op) {
 2985                 case NFSV4OP_CBGETATTR:
 2986                         clp = NULL;
 2987                         error = nfsm_getfh(nd, &nfhp);
 2988                         if (!error)
 2989                                 error = nfsrv_getattrbits(nd, &attrbits,
 2990                                     NULL, NULL);
 2991                         if (!error) {
 2992                                 mp = nfscl_getmnt(cbident);
 2993                                 if (mp == NULL)
 2994                                         error = NFSERR_SERVERFAULT;
 2995                         }
 2996                         if (!error) {
 2997                                 dp = NULL;
 2998                                 NFSLOCKCLSTATE();
 2999                                 clp = nfscl_findcl(VFSTONFS(mp));
 3000                                 if (clp != NULL)
 3001                                         dp = nfscl_finddeleg(clp, nfhp->nfh_fh,
 3002                                             nfhp->nfh_len);
 3003                                 NFSUNLOCKCLSTATE();
 3004                                 if (dp == NULL)
 3005                                         error = NFSERR_SERVERFAULT;
 3006                         }
 3007                         if (!error) {
 3008                                 ret = nfscl_ngetreopen(mp, nfhp->nfh_fh,
 3009                                     nfhp->nfh_len, p, &np);
 3010                                 if (!ret)
 3011                                         vp = NFSTOV(np);
 3012                         }
 3013                         if (nfhp != NULL)
 3014                                 FREE((caddr_t)nfhp, M_NFSFH);
 3015                         if (!error) {
 3016                                 NFSZERO_ATTRBIT(&rattrbits);
 3017                                 if (NFSISSET_ATTRBIT(&attrbits,
 3018                                     NFSATTRBIT_SIZE)) {
 3019                                         if (!ret)
 3020                                                 va.va_size = np->n_size;
 3021                                         else
 3022                                                 va.va_size = dp->nfsdl_size;
 3023                                         NFSSETBIT_ATTRBIT(&rattrbits,
 3024                                             NFSATTRBIT_SIZE);
 3025                                 }
 3026                                 if (NFSISSET_ATTRBIT(&attrbits,
 3027                                     NFSATTRBIT_CHANGE)) {
 3028                                         va.va_filerev = dp->nfsdl_change;
 3029                                         if (ret || (np->n_flag & NDELEGMOD))
 3030                                                 va.va_filerev++;
 3031                                         NFSSETBIT_ATTRBIT(&rattrbits,
 3032                                             NFSATTRBIT_CHANGE);
 3033                                 }
 3034                                 (void) nfsv4_fillattr(nd, NULL, NULL, &va,
 3035                                     NULL, 0, &rattrbits, NULL, NULL, 0, 0);
 3036                                 if (!ret)
 3037                                         vrele(vp);
 3038                         }
 3039                         break;
 3040                 case NFSV4OP_CBRECALL:
 3041                         clp = NULL;
 3042                         NFSM_DISSECT(tl, u_int32_t *, NFSX_STATEID +
 3043                             NFSX_UNSIGNED);
 3044                         stateid.seqid = *tl++;
 3045                         NFSBCOPY((caddr_t)tl, (caddr_t)stateid.other,
 3046                             NFSX_STATEIDOTHER);
 3047                         tl += (NFSX_STATEIDOTHER / NFSX_UNSIGNED);
 3048                         trunc = fxdr_unsigned(int, *tl);
 3049                         error = nfsm_getfh(nd, &nfhp);
 3050                         if (!error) {
 3051                                 mp = nfscl_getmnt(cbident);
 3052                                 if (mp == NULL)
 3053                                         error = NFSERR_SERVERFAULT;
 3054                         }
 3055                         if (!error) {
 3056                                 NFSLOCKCLSTATE();
 3057                                 clp = nfscl_findcl(VFSTONFS(mp));
 3058                                 if (clp != NULL) {
 3059                                         dp = nfscl_finddeleg(clp, nfhp->nfh_fh,
 3060                                             nfhp->nfh_len);
 3061                                         if (dp != NULL) {
 3062                                                 dp->nfsdl_flags |=
 3063                                                     NFSCLDL_RECALL;
 3064                                                 wakeup((caddr_t)clp);
 3065                                         }
 3066                                 } else {
 3067                                         error = NFSERR_SERVERFAULT;
 3068                                 }
 3069                                 NFSUNLOCKCLSTATE();
 3070                         }
 3071                         if (nfhp != NULL)
 3072                                 FREE((caddr_t)nfhp, M_NFSFH);
 3073                         break;
 3074                 };
 3075                 if (error) {
 3076                         if (error == EBADRPC || error == NFSERR_BADXDR) {
 3077                                 nd->nd_repstat = NFSERR_BADXDR;
 3078                         } else {
 3079                                 nd->nd_repstat = error;
 3080                         }
 3081                         error = 0;
 3082                 }
 3083                 retops++;
 3084                 if (nd->nd_repstat) {
 3085                         *repp = nfscl_errmap(nd);
 3086                         break;
 3087                 } else
 3088                         *repp = 0;      /* NFS4_OK */
 3089         }
 3090 nfsmout:
 3091         if (error) {
 3092                 if (error == EBADRPC || error == NFSERR_BADXDR)
 3093                         nd->nd_repstat = NFSERR_BADXDR;
 3094                 else
 3095                         printf("nfsv4 comperr1=%d\n", error);
 3096         }
 3097         if (taglen == -1) {
 3098                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 3099                 *tl++ = 0;
 3100                 *tl = 0;
 3101         } else {
 3102                 *retopsp = txdr_unsigned(retops);
 3103         }
 3104         *nd->nd_errp = nfscl_errmap(nd);
 3105 }
 3106 
 3107 /*
 3108  * Generate the next cbident value. Basically just increment a static value
 3109  * and then check that it isn't already in the list, if it has wrapped around.
 3110  */
 3111 static u_int32_t
 3112 nfscl_nextcbident(void)
 3113 {
 3114         struct nfsclclient *clp;
 3115         int matched;
 3116         static u_int32_t nextcbident = 0;
 3117         static int haswrapped = 0;
 3118 
 3119         nextcbident++;
 3120         if (nextcbident == 0)
 3121                 haswrapped = 1;
 3122         if (haswrapped) {
 3123                 /*
 3124                  * Search the clientid list for one already using this cbident.
 3125                  */
 3126                 do {
 3127                         matched = 0;
 3128                         NFSLOCKCLSTATE();
 3129                         LIST_FOREACH(clp, &nfsclhead, nfsc_list) {
 3130                                 if (clp->nfsc_cbident == nextcbident) {
 3131                                         matched = 1;
 3132                                         break;
 3133                                 }
 3134                         }
 3135                         NFSUNLOCKCLSTATE();
 3136                         if (matched == 1)
 3137                                 nextcbident++;
 3138                 } while (matched);
 3139         }
 3140         return (nextcbident);
 3141 }
 3142 
 3143 /*
 3144  * Get the mount point related to a given cbident.
 3145  */
 3146 static mount_t
 3147 nfscl_getmnt(u_int32_t cbident)
 3148 {
 3149         struct nfsclclient *clp;
 3150         struct nfsmount *nmp;
 3151 
 3152         NFSLOCKCLSTATE();
 3153         LIST_FOREACH(clp, &nfsclhead, nfsc_list) {
 3154                 if (clp->nfsc_cbident == cbident)
 3155                         break;
 3156         }
 3157         if (clp == NULL) {
 3158                 NFSUNLOCKCLSTATE();
 3159                 return (NULL);
 3160         }
 3161         nmp = clp->nfsc_nmp;
 3162         NFSUNLOCKCLSTATE();
 3163         return (nmp->nm_mountp);
 3164 }
 3165 
 3166 /*
 3167  * Search for a lock conflict locally on the client. A conflict occurs if
 3168  * - not same owner and overlapping byte range and at least one of them is
 3169  *   a write lock or this is an unlock.
 3170  */
 3171 static int
 3172 nfscl_localconflict(struct nfsclclient *clp, struct nfscllock *nlop,
 3173     u_int8_t *own, struct nfscldeleg *dp, struct nfscllock **lopp)
 3174 {
 3175         struct nfsclowner *owp;
 3176         struct nfsclopen *op;
 3177         int ret;
 3178 
 3179         if (dp != NULL) {
 3180                 ret = nfscl_checkconflict(&dp->nfsdl_lock, nlop, own, lopp);
 3181                 if (ret)
 3182                         return (ret);
 3183         }
 3184         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 3185                 LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 3186                         ret = nfscl_checkconflict(&op->nfso_lock, nlop, own,
 3187                             lopp);
 3188                         if (ret)
 3189                                 return (ret);
 3190                 }
 3191         }
 3192         return (0);
 3193 }
 3194 
 3195 static int
 3196 nfscl_checkconflict(struct nfscllockownerhead *lhp, struct nfscllock *nlop,
 3197     u_int8_t *own, struct nfscllock **lopp)
 3198 {
 3199         struct nfscllockowner *lp;
 3200         struct nfscllock *lop;
 3201 
 3202         LIST_FOREACH(lp, lhp, nfsl_list) {
 3203                 if (NFSBCMP(lp->nfsl_owner, own, NFSV4CL_LOCKNAMELEN)) {
 3204                         LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
 3205                                 if (lop->nfslo_first >= nlop->nfslo_end)
 3206                                         break;
 3207                                 if (lop->nfslo_end <= nlop->nfslo_first)
 3208                                         continue;
 3209                                 if (lop->nfslo_type == F_WRLCK ||
 3210                                     nlop->nfslo_type == F_WRLCK ||
 3211                                     nlop->nfslo_type == F_UNLCK) {
 3212                                         if (lopp != NULL)
 3213                                                 *lopp = lop;
 3214                                         return (NFSERR_DENIED);
 3215                                 }
 3216                         }
 3217                 }
 3218         }
 3219         return (0);
 3220 }
 3221 
 3222 /*
 3223  * Check for a local conflicting lock.
 3224  */
 3225 APPLESTATIC int
 3226 nfscl_lockt(vnode_t vp, struct nfsclclient *clp, u_int64_t off,
 3227     u_int64_t len, struct flock *fl, NFSPROC_T *p)
 3228 {
 3229         struct nfscllock *lop, nlck;
 3230         struct nfscldeleg *dp;
 3231         struct nfsnode *np;
 3232         u_int8_t own[NFSV4CL_LOCKNAMELEN];
 3233         int error;
 3234 
 3235         nlck.nfslo_type = fl->l_type;
 3236         nlck.nfslo_first = off;
 3237         if (len == NFS64BITSSET) {
 3238                 nlck.nfslo_end = NFS64BITSSET;
 3239         } else {
 3240                 nlck.nfslo_end = off + len;
 3241                 if (nlck.nfslo_end <= nlck.nfslo_first)
 3242                         return (NFSERR_INVAL);
 3243         }
 3244         np = VTONFS(vp);
 3245         nfscl_filllockowner(p, own);
 3246         NFSLOCKCLSTATE();
 3247         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 3248         error = nfscl_localconflict(clp, &nlck, own, dp, &lop);
 3249         if (error == NFSERR_DENIED)
 3250                 error = EACCES;
 3251         if (error) {
 3252                 fl->l_whence = SEEK_SET;
 3253                 fl->l_start = lop->nfslo_first;
 3254                 if (lop->nfslo_end == NFS64BITSSET)
 3255                         fl->l_len = 0;
 3256                 else
 3257                         fl->l_len = lop->nfslo_end - lop->nfslo_first;
 3258                 fl->l_pid = (pid_t)0;
 3259                 fl->l_type = lop->nfslo_type;
 3260         } else if (dp != NULL && ((dp->nfsdl_flags & NFSCLDL_WRITE) ||
 3261             fl->l_type == F_RDLCK)) {
 3262                 /*
 3263                  * The delegation ensures that there isn't a conflicting
 3264                  * lock on the server, so return -1 to indicate an RPC
 3265                  * isn't required.
 3266                  */
 3267                 fl->l_type = F_UNLCK;
 3268                 error = -1;
 3269         }
 3270         NFSUNLOCKCLSTATE();
 3271         return (error);
 3272 }
 3273 
 3274 /*
 3275  * Handle Recall of a delegation.
 3276  * The clp must be exclusive locked when this is called.
 3277  */
 3278 static int
 3279 nfscl_recalldeleg(struct nfsclclient *clp, struct nfsmount *nmp,
 3280     struct nfscldeleg *dp, vnode_t vp, struct ucred *cred, NFSPROC_T *p)
 3281 {
 3282         struct nfsclowner *owp, *lowp, *nowp;
 3283         struct nfsclopen *op, *lop;
 3284         struct nfscllockowner *lp;
 3285         struct nfscllock *lckp;
 3286         struct nfsnode *np;
 3287         int error = 0, ret, gotvp = 0;
 3288 
 3289         if (vp == NULL) {
 3290                 /*
 3291                  * First, get a vnode for the file. This is needed to do RPCs.
 3292                  */
 3293                 ret = nfscl_ngetreopen(nmp->nm_mountp, dp->nfsdl_fh,
 3294                     dp->nfsdl_fhlen, p, &np);
 3295                 if (ret) {
 3296                         /*
 3297                          * File isn't open, so nothing to move over to the
 3298                          * server.
 3299                          */
 3300                         return (0);
 3301                 }
 3302                 vp = NFSTOV(np);
 3303                 gotvp = 1;
 3304         } else {
 3305                 np = VTONFS(vp);
 3306         }
 3307         dp->nfsdl_flags &= ~NFSCLDL_MODTIMESET;
 3308         NFSINVALATTRCACHE(np);
 3309 
 3310         /*
 3311          * Ok, if it's a write delegation, flush data to the server, so
 3312          * that close/open consistency is retained.
 3313          */
 3314         NFSLOCKNODE(np);
 3315         if ((dp->nfsdl_flags & NFSCLDL_WRITE) && (np->n_flag & NMODIFIED)) {
 3316 #ifdef APPLE
 3317                 OSBitOrAtomic((u_int32_t)NDELEGRECALL, (UInt32 *)&np->n_flag);
 3318 #else
 3319                 np->n_flag |= NDELEGRECALL;
 3320 #endif
 3321                 NFSUNLOCKNODE(np);
 3322                 (void) ncl_flush(vp, MNT_WAIT, cred, p, 1);
 3323                 NFSLOCKNODE(np);
 3324 #ifdef APPLE
 3325                 OSBitAndAtomic((int32_t)~(NMODIFIED | NDELEGRECALL), (UInt32 *)&np->n_flag);
 3326 #else
 3327                 np->n_flag &= ~(NMODIFIED | NDELEGRECALL);
 3328 #endif
 3329         }
 3330         NFSUNLOCKNODE(np);
 3331 
 3332         /*
 3333          * Now, for each openowner with opens issued locally, move them
 3334          * over to state against the server.
 3335          */
 3336         LIST_FOREACH(lowp, &dp->nfsdl_owner, nfsow_list) {
 3337                 lop = LIST_FIRST(&lowp->nfsow_open);
 3338                 if (lop != NULL) {
 3339                         if (LIST_NEXT(lop, nfso_list) != NULL)
 3340                                 panic("nfsdlg mult opens");
 3341                         /*
 3342                          * Look for the same openowner against the server.
 3343                          */
 3344                         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 3345                                 if (!NFSBCMP(lowp->nfsow_owner,
 3346                                     owp->nfsow_owner, NFSV4CL_LOCKNAMELEN)) {
 3347                                         newnfs_copycred(&dp->nfsdl_cred, cred);
 3348                                         ret = nfscl_moveopen(vp, clp, nmp, lop,
 3349                                             owp, dp, cred, p);
 3350                                         if (ret == NFSERR_STALECLIENTID ||
 3351                                             ret == NFSERR_STALEDONTRECOVER) {
 3352                                                 if (gotvp)
 3353                                                         vrele(vp);
 3354                                                 return (ret);
 3355                                         }
 3356                                         if (ret) {
 3357                                                 nfscl_freeopen(lop, 1);
 3358                                                 if (!error)
 3359                                                         error = ret;
 3360                                         }
 3361                                         break;
 3362                                 }
 3363                         }
 3364 
 3365                         /*
 3366                          * If no openowner found, create one and get an open
 3367                          * for it.
 3368                          */
 3369                         if (owp == NULL) {
 3370                                 MALLOC(nowp, struct nfsclowner *,
 3371                                     sizeof (struct nfsclowner), M_NFSCLOWNER,
 3372                                     M_WAITOK);
 3373                                 nfscl_newopen(clp, NULL, &owp, &nowp, &op, 
 3374                                     NULL, lowp->nfsow_owner, dp->nfsdl_fh,
 3375                                     dp->nfsdl_fhlen, NULL);
 3376                                 newnfs_copycred(&dp->nfsdl_cred, cred);
 3377                                 ret = nfscl_moveopen(vp, clp, nmp, lop,
 3378                                     owp, dp, cred, p);
 3379                                 if (ret) {
 3380                                         nfscl_freeopenowner(owp, 0);
 3381                                         if (ret == NFSERR_STALECLIENTID ||
 3382                                             ret == NFSERR_STALEDONTRECOVER) {
 3383                                                 if (gotvp)
 3384                                                         vrele(vp);
 3385                                                 return (ret);
 3386                                         }
 3387                                         if (ret) {
 3388                                                 nfscl_freeopen(lop, 1);
 3389                                                 if (!error)
 3390                                                         error = ret;
 3391                                         }
 3392                                 }
 3393                         }
 3394                 }
 3395         }
 3396 
 3397         /*
 3398          * Now, get byte range locks for any locks done locally.
 3399          */
 3400         LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
 3401                 LIST_FOREACH(lckp, &lp->nfsl_lock, nfslo_list) {
 3402                         newnfs_copycred(&dp->nfsdl_cred, cred);
 3403                         ret = nfscl_relock(vp, clp, nmp, lp, lckp, cred, p);
 3404                         if (ret == NFSERR_STALESTATEID ||
 3405                             ret == NFSERR_STALEDONTRECOVER ||
 3406                             ret == NFSERR_STALECLIENTID) {
 3407                                 if (gotvp)
 3408                                         vrele(vp);
 3409                                 return (ret);
 3410                         }
 3411                         if (ret && !error)
 3412                                 error = ret;
 3413                 }
 3414         }
 3415         if (gotvp)
 3416                 vrele(vp);
 3417         return (error);
 3418 }
 3419 
 3420 /*
 3421  * Move a locally issued open over to an owner on the state list.
 3422  * SIDE EFFECT: If it needs to sleep (do an rpc), it unlocks clstate and
 3423  * returns with it unlocked.
 3424  */
 3425 static int
 3426 nfscl_moveopen(vnode_t vp, struct nfsclclient *clp, struct nfsmount *nmp,
 3427     struct nfsclopen *lop, struct nfsclowner *owp, struct nfscldeleg *dp,
 3428     struct ucred *cred, NFSPROC_T *p)
 3429 {
 3430         struct nfsclopen *op, *nop;
 3431         struct nfscldeleg *ndp;
 3432         struct nfsnode *np;
 3433         int error = 0, newone;
 3434 
 3435         /*
 3436          * First, look for an appropriate open, If found, just increment the
 3437          * opencnt in it.
 3438          */
 3439         LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 3440                 if ((op->nfso_mode & lop->nfso_mode) == lop->nfso_mode &&
 3441                     op->nfso_fhlen == lop->nfso_fhlen &&
 3442                     !NFSBCMP(op->nfso_fh, lop->nfso_fh, op->nfso_fhlen)) {
 3443                         op->nfso_opencnt += lop->nfso_opencnt;
 3444                         nfscl_freeopen(lop, 1);
 3445                         return (0);
 3446                 }
 3447         }
 3448 
 3449         /* No appropriate open, so we have to do one against the server. */
 3450         np = VTONFS(vp);
 3451         MALLOC(nop, struct nfsclopen *, sizeof (struct nfsclopen) +
 3452             lop->nfso_fhlen - 1, M_NFSCLOPEN, M_WAITOK);
 3453         newone = 0;
 3454         nfscl_newopen(clp, NULL, &owp, NULL, &op, &nop, owp->nfsow_owner,
 3455             lop->nfso_fh, lop->nfso_fhlen, &newone);
 3456         ndp = dp;
 3457         error = nfscl_tryopen(nmp, vp, np->n_v4->n4_data, np->n_v4->n4_fhlen,
 3458             lop->nfso_fh, lop->nfso_fhlen, lop->nfso_mode, op,
 3459             NFS4NODENAME(np->n_v4), np->n_v4->n4_namelen, &ndp, 0, 0, cred, p);
 3460         if (error) {
 3461                 if (newone)
 3462                         nfscl_freeopen(op, 0);
 3463         } else {
 3464                 if (newone)
 3465                         newnfs_copyincred(cred, &op->nfso_cred);
 3466                 op->nfso_mode |= lop->nfso_mode;
 3467                 op->nfso_opencnt += lop->nfso_opencnt;
 3468                 nfscl_freeopen(lop, 1);
 3469         }
 3470         if (nop != NULL)
 3471                 FREE((caddr_t)nop, M_NFSCLOPEN);
 3472         if (ndp != NULL) {
 3473                 /*
 3474                  * What should I do with the returned delegation, since the
 3475                  * delegation is being recalled? For now, just printf and
 3476                  * through it away.
 3477                  */
 3478                 printf("Moveopen returned deleg\n");
 3479                 FREE((caddr_t)ndp, M_NFSCLDELEG);
 3480         }
 3481         return (error);
 3482 }
 3483 
 3484 /*
 3485  * Recall all delegations on this client.
 3486  */
 3487 static void
 3488 nfscl_totalrecall(struct nfsclclient *clp)
 3489 {
 3490         struct nfscldeleg *dp;
 3491 
 3492         TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list)
 3493                 dp->nfsdl_flags |= NFSCLDL_RECALL;
 3494 }
 3495 
 3496 /*
 3497  * Relock byte ranges. Called for delegation recall and state expiry.
 3498  */
 3499 static int
 3500 nfscl_relock(vnode_t vp, struct nfsclclient *clp, struct nfsmount *nmp,
 3501     struct nfscllockowner *lp, struct nfscllock *lop, struct ucred *cred,
 3502     NFSPROC_T *p)
 3503 {
 3504         struct nfscllockowner *nlp;
 3505         struct nfsfh *nfhp;
 3506         u_int64_t off, len;
 3507         u_int32_t clidrev = 0;
 3508         int error, newone, donelocally;
 3509 
 3510         off = lop->nfslo_first;
 3511         len = lop->nfslo_end - lop->nfslo_first;
 3512         error = nfscl_getbytelock(vp, off, len, lop->nfslo_type, cred, p,
 3513             clp, 1, lp->nfsl_owner, lp->nfsl_openowner, &nlp, &newone,
 3514             &donelocally);
 3515         if (error || donelocally)
 3516                 return (error);
 3517         if (nmp->nm_clp != NULL)
 3518                 clidrev = nmp->nm_clp->nfsc_clientidrev;
 3519         else
 3520                 clidrev = 0;
 3521         nfhp = VTONFS(vp)->n_fhp;
 3522         error = nfscl_trylock(nmp, vp, nfhp->nfh_fh,
 3523             nfhp->nfh_len, nlp, newone, 0, off,
 3524             len, lop->nfslo_type, cred, p);
 3525         if (error)
 3526                 nfscl_freelockowner(nlp, 0);
 3527         return (error);
 3528 }
 3529 
 3530 /*
 3531  * Called to re-open a file. Basically get a vnode for the file handle
 3532  * and then call nfsrpc_openrpc() to do the rest.
 3533  */
 3534 static int
 3535 nfsrpc_reopen(struct nfsmount *nmp, u_int8_t *fhp, int fhlen,
 3536     u_int32_t mode, struct nfsclopen *op, struct nfscldeleg **dpp,
 3537     struct ucred *cred, NFSPROC_T *p)
 3538 {
 3539         struct nfsnode *np;
 3540         vnode_t vp;
 3541         int error;
 3542 
 3543         error = nfscl_ngetreopen(nmp->nm_mountp, fhp, fhlen, p, &np);
 3544         if (error)
 3545                 return (error);
 3546         vp = NFSTOV(np);
 3547         if (np->n_v4 != NULL) {
 3548                 error = nfscl_tryopen(nmp, vp, np->n_v4->n4_data,
 3549                     np->n_v4->n4_fhlen, fhp, fhlen, mode, op,
 3550                     NFS4NODENAME(np->n_v4), np->n_v4->n4_namelen, dpp, 0, 0,
 3551                     cred, p);
 3552         } else {
 3553                 error = EINVAL;
 3554         }
 3555         vrele(vp);
 3556         return (error);
 3557 }
 3558 
 3559 /*
 3560  * Try an open against the server. Just call nfsrpc_openrpc(), retrying while
 3561  * NFSERR_DELAY. Also, try system credentials, if the passed in credentials
 3562  * fail.
 3563  */
 3564 static int
 3565 nfscl_tryopen(struct nfsmount *nmp, vnode_t vp, u_int8_t *fhp, int fhlen,
 3566     u_int8_t *newfhp, int newfhlen, u_int32_t mode, struct nfsclopen *op,
 3567     u_int8_t *name, int namelen, struct nfscldeleg **ndpp,
 3568     int reclaim, u_int32_t delegtype, struct ucred *cred, NFSPROC_T *p)
 3569 {
 3570         int error;
 3571 
 3572         do {
 3573                 error = nfsrpc_openrpc(nmp, vp, fhp, fhlen, newfhp, newfhlen,
 3574                     mode, op, name, namelen, ndpp, reclaim, delegtype, cred, p,
 3575                     0, 0);
 3576                 if (error == NFSERR_DELAY)
 3577                         (void) nfs_catnap(PZERO, "nfstryop");
 3578         } while (error == NFSERR_DELAY);
 3579         if (error == EAUTH || error == EACCES) {
 3580                 /* Try again using system credentials */
 3581                 newnfs_setroot(cred);
 3582                 do {
 3583                     error = nfsrpc_openrpc(nmp, vp, fhp, fhlen, newfhp,
 3584                         newfhlen, mode, op, name, namelen, ndpp, reclaim,
 3585                         delegtype, cred, p, 1, 0);
 3586                     if (error == NFSERR_DELAY)
 3587                         (void) nfs_catnap(PZERO, "nfstryop");
 3588                 } while (error == NFSERR_DELAY);
 3589         }
 3590         return (error);
 3591 }
 3592 
 3593 /*
 3594  * Try a byte range lock. Just loop on nfsrpc_lock() while it returns
 3595  * NFSERR_DELAY. Also, retry with system credentials, if the provided
 3596  * cred don't work.
 3597  */
 3598 static int
 3599 nfscl_trylock(struct nfsmount *nmp, vnode_t vp, u_int8_t *fhp,
 3600     int fhlen, struct nfscllockowner *nlp, int newone, int reclaim,
 3601     u_int64_t off, u_int64_t len, short type, struct ucred *cred, NFSPROC_T *p)
 3602 {
 3603         struct nfsrv_descript nfsd, *nd = &nfsd;
 3604         int error;
 3605 
 3606         do {
 3607                 error = nfsrpc_lock(nd, nmp, vp, fhp, fhlen, nlp, newone,
 3608                     reclaim, off, len, type, cred, p, 0);
 3609                 if (!error && nd->nd_repstat == NFSERR_DELAY)
 3610                         (void) nfs_catnap(PZERO, "nfstrylck");
 3611         } while (!error && nd->nd_repstat == NFSERR_DELAY);
 3612         if (!error)
 3613                 error = nd->nd_repstat;
 3614         if (error == EAUTH || error == EACCES) {
 3615                 /* Try again using root credentials */
 3616                 newnfs_setroot(cred);
 3617                 do {
 3618                         error = nfsrpc_lock(nd, nmp, vp, fhp, fhlen, nlp,
 3619                             newone, reclaim, off, len, type, cred, p, 1);
 3620                         if (!error && nd->nd_repstat == NFSERR_DELAY)
 3621                                 (void) nfs_catnap(PZERO, "nfstrylck");
 3622                 } while (!error && nd->nd_repstat == NFSERR_DELAY);
 3623                 if (!error)
 3624                         error = nd->nd_repstat;
 3625         }
 3626         return (error);
 3627 }
 3628 
 3629 /*
 3630  * Try a delegreturn against the server. Just call nfsrpc_delegreturn(),
 3631  * retrying while NFSERR_DELAY. Also, try system credentials, if the passed in
 3632  * credentials fail.
 3633  */
 3634 static int
 3635 nfscl_trydelegreturn(struct nfscldeleg *dp, struct ucred *cred,
 3636     struct nfsmount *nmp, NFSPROC_T *p)
 3637 {
 3638         int error;
 3639 
 3640         do {
 3641                 error = nfsrpc_delegreturn(dp, cred, nmp, p, 0);
 3642                 if (error == NFSERR_DELAY)
 3643                         (void) nfs_catnap(PZERO, "nfstrydp");
 3644         } while (error == NFSERR_DELAY);
 3645         if (error == EAUTH || error == EACCES) {
 3646                 /* Try again using system credentials */
 3647                 newnfs_setroot(cred);
 3648                 do {
 3649                         error = nfsrpc_delegreturn(dp, cred, nmp, p, 1);
 3650                         if (error == NFSERR_DELAY)
 3651                                 (void) nfs_catnap(PZERO, "nfstrydp");
 3652                 } while (error == NFSERR_DELAY);
 3653         }
 3654         return (error);
 3655 }
 3656 
 3657 /*
 3658  * Try a close against the server. Just call nfsrpc_closerpc(),
 3659  * retrying while NFSERR_DELAY. Also, try system credentials, if the passed in
 3660  * credentials fail.
 3661  */
 3662 APPLESTATIC int
 3663 nfscl_tryclose(struct nfsclopen *op, struct ucred *cred,
 3664     struct nfsmount *nmp, NFSPROC_T *p)
 3665 {
 3666         struct nfsrv_descript nfsd, *nd = &nfsd;
 3667         int error;
 3668 
 3669         do {
 3670                 error = nfsrpc_closerpc(nd, nmp, op, cred, p, 0);
 3671                 if (error == NFSERR_DELAY)
 3672                         (void) nfs_catnap(PZERO, "nfstrycl");
 3673         } while (error == NFSERR_DELAY);
 3674         if (error == EAUTH || error == EACCES) {
 3675                 /* Try again using system credentials */
 3676                 newnfs_setroot(cred);
 3677                 do {
 3678                         error = nfsrpc_closerpc(nd, nmp, op, cred, p, 1);
 3679                         if (error == NFSERR_DELAY)
 3680                                 (void) nfs_catnap(PZERO, "nfstrycl");
 3681                 } while (error == NFSERR_DELAY);
 3682         }
 3683         return (error);
 3684 }
 3685 
 3686 /*
 3687  * Decide if a delegation on a file permits close without flushing writes
 3688  * to the server. This might be a big performance win in some environments.
 3689  * (Not useful until the client does caching on local stable storage.)
 3690  */
 3691 APPLESTATIC int
 3692 nfscl_mustflush(vnode_t vp)
 3693 {
 3694         struct nfsclclient *clp;
 3695         struct nfscldeleg *dp;
 3696         struct nfsnode *np;
 3697         struct nfsmount *nmp;
 3698 
 3699         np = VTONFS(vp);
 3700         nmp = VFSTONFS(vnode_mount(vp));
 3701         if (!NFSHASNFSV4(nmp))
 3702                 return (1);
 3703         NFSLOCKCLSTATE();
 3704         clp = nfscl_findcl(nmp);
 3705         if (clp == NULL) {
 3706                 NFSUNLOCKCLSTATE();
 3707                 return (1);
 3708         }
 3709         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 3710         if (dp != NULL && (dp->nfsdl_flags & (NFSCLDL_WRITE | NFSCLDL_RECALL))
 3711              == NFSCLDL_WRITE &&
 3712             (dp->nfsdl_sizelimit >= np->n_size ||
 3713              !NFSHASSTRICT3530(nmp))) {
 3714                 NFSUNLOCKCLSTATE();
 3715                 return (0);
 3716         }
 3717         NFSUNLOCKCLSTATE();
 3718         return (1);
 3719 }
 3720 
 3721 /*
 3722  * See if a (write) delegation exists for this file.
 3723  */
 3724 APPLESTATIC int
 3725 nfscl_nodeleg(vnode_t vp, int writedeleg)
 3726 {
 3727         struct nfsclclient *clp;
 3728         struct nfscldeleg *dp;
 3729         struct nfsnode *np;
 3730         struct nfsmount *nmp;
 3731 
 3732         np = VTONFS(vp);
 3733         nmp = VFSTONFS(vnode_mount(vp));
 3734         if (!NFSHASNFSV4(nmp))
 3735                 return (1);
 3736         NFSLOCKCLSTATE();
 3737         clp = nfscl_findcl(nmp);
 3738         if (clp == NULL) {
 3739                 NFSUNLOCKCLSTATE();
 3740                 return (1);
 3741         }
 3742         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 3743         if (dp != NULL && (dp->nfsdl_flags & NFSCLDL_RECALL) == 0 &&
 3744             (writedeleg == 0 || (dp->nfsdl_flags & NFSCLDL_WRITE)
 3745              == NFSCLDL_WRITE)) {
 3746                 NFSUNLOCKCLSTATE();
 3747                 return (0);
 3748         }
 3749         NFSUNLOCKCLSTATE();
 3750         return (1);
 3751 }
 3752 
 3753 /*
 3754  * Look for an associated delegation that should be DelegReturned.
 3755  */
 3756 APPLESTATIC int
 3757 nfscl_removedeleg(vnode_t vp, NFSPROC_T *p, nfsv4stateid_t *stp)
 3758 {
 3759         struct nfsclclient *clp;
 3760         struct nfscldeleg *dp;
 3761         struct nfsclowner *owp;
 3762         struct nfscllockowner *lp;
 3763         struct nfsmount *nmp;
 3764         struct ucred *cred;
 3765         struct nfsnode *np;
 3766         int igotlock = 0, triedrecall = 0, needsrecall, retcnt = 0, islept;
 3767 
 3768         nmp = VFSTONFS(vnode_mount(vp));
 3769         np = VTONFS(vp);
 3770         NFSLOCKCLSTATE();
 3771         /*
 3772          * Loop around waiting for:
 3773          * - outstanding I/O operations on delegations to complete
 3774          * - for a delegation on vp that has state, lock the client and
 3775          *   do a recall
 3776          * - return delegation with no state
 3777          */
 3778         while (1) {
 3779                 clp = nfscl_findcl(nmp);
 3780                 if (clp == NULL) {
 3781                         NFSUNLOCKCLSTATE();
 3782                         return (retcnt);
 3783                 }
 3784                 dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh,
 3785                     np->n_fhp->nfh_len);
 3786                 if (dp != NULL) {
 3787                     /*
 3788                      * Wait for outstanding I/O ops to be done.
 3789                      */
 3790                     if (dp->nfsdl_rwlock.nfslock_usecnt > 0) {
 3791                         if (igotlock) {
 3792                             nfsv4_unlock(&clp->nfsc_lock, 0);
 3793                             igotlock = 0;
 3794                         }
 3795                         dp->nfsdl_rwlock.nfslock_lock |= NFSV4LOCK_WANTED;
 3796                         (void) nfsmsleep(&dp->nfsdl_rwlock,
 3797                             NFSCLSTATEMUTEXPTR, PZERO, "nfscld", NULL);
 3798                         continue;
 3799                     }
 3800                     needsrecall = 0;
 3801                     LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
 3802                         if (!LIST_EMPTY(&owp->nfsow_open)) {
 3803                             needsrecall = 1;
 3804                             break;
 3805                         }
 3806                     }
 3807                     if (!needsrecall) {
 3808                         LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
 3809                             if (!LIST_EMPTY(&lp->nfsl_lock)) {
 3810                                 needsrecall = 1;
 3811                                 break;
 3812                             }
 3813                         }
 3814                     }
 3815                     if (needsrecall && !triedrecall) {
 3816                         islept = 0;
 3817                         while (!igotlock) {
 3818                             igotlock = nfsv4_lock(&clp->nfsc_lock, 1,
 3819                                 &islept, NFSCLSTATEMUTEXPTR);
 3820                             if (islept)
 3821                                 break;
 3822                         }
 3823                         if (islept)
 3824                             continue;
 3825                         NFSUNLOCKCLSTATE();
 3826                         cred = newnfs_getcred();
 3827                         newnfs_copycred(&dp->nfsdl_cred, cred);
 3828                         (void) nfscl_recalldeleg(clp, nmp, dp, vp, cred, p);
 3829                         NFSFREECRED(cred);
 3830                         triedrecall = 1;
 3831                         NFSLOCKCLSTATE();
 3832                         nfsv4_unlock(&clp->nfsc_lock, 0);
 3833                         igotlock = 0;
 3834                         continue;
 3835                     }
 3836                     *stp = dp->nfsdl_stateid;
 3837                     retcnt = 1;
 3838                     nfscl_cleandeleg(dp);
 3839                     nfscl_freedeleg(&clp->nfsc_deleg, dp);
 3840                 }
 3841                 if (igotlock)
 3842                     nfsv4_unlock(&clp->nfsc_lock, 0);
 3843                 NFSUNLOCKCLSTATE();
 3844                 return (retcnt);
 3845         }
 3846 }
 3847 
 3848 /*
 3849  * Look for associated delegation(s) that should be DelegReturned.
 3850  */
 3851 APPLESTATIC int
 3852 nfscl_renamedeleg(vnode_t fvp, nfsv4stateid_t *fstp, int *gotfdp, vnode_t tvp,
 3853     nfsv4stateid_t *tstp, int *gottdp, NFSPROC_T *p)
 3854 {
 3855         struct nfsclclient *clp;
 3856         struct nfscldeleg *dp;
 3857         struct nfsclowner *owp;
 3858         struct nfscllockowner *lp;
 3859         struct nfsmount *nmp;
 3860         struct ucred *cred;
 3861         struct nfsnode *np;
 3862         int igotlock = 0, triedrecall = 0, needsrecall, retcnt = 0, islept;
 3863 
 3864         nmp = VFSTONFS(vnode_mount(fvp));
 3865         *gotfdp = 0;
 3866         *gottdp = 0;
 3867         NFSLOCKCLSTATE();
 3868         /*
 3869          * Loop around waiting for:
 3870          * - outstanding I/O operations on delegations to complete
 3871          * - for a delegation on fvp that has state, lock the client and
 3872          *   do a recall
 3873          * - return delegation(s) with no state.
 3874          */
 3875         while (1) {
 3876                 clp = nfscl_findcl(nmp);
 3877                 if (clp == NULL) {
 3878                         NFSUNLOCKCLSTATE();
 3879                         return (retcnt);
 3880                 }
 3881                 np = VTONFS(fvp);
 3882                 dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh,
 3883                     np->n_fhp->nfh_len);
 3884                 if (dp != NULL && *gotfdp == 0) {
 3885                     /*
 3886                      * Wait for outstanding I/O ops to be done.
 3887                      */
 3888                     if (dp->nfsdl_rwlock.nfslock_usecnt > 0) {
 3889                         if (igotlock) {
 3890                             nfsv4_unlock(&clp->nfsc_lock, 0);
 3891                             igotlock = 0;
 3892                         }
 3893                         dp->nfsdl_rwlock.nfslock_lock |= NFSV4LOCK_WANTED;
 3894                         (void) nfsmsleep(&dp->nfsdl_rwlock,
 3895                             NFSCLSTATEMUTEXPTR, PZERO, "nfscld", NULL);
 3896                         continue;
 3897                     }
 3898                     needsrecall = 0;
 3899                     LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
 3900                         if (!LIST_EMPTY(&owp->nfsow_open)) {
 3901                             needsrecall = 1;
 3902                             break;
 3903                         }
 3904                     }
 3905                     if (!needsrecall) {
 3906                         LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
 3907                             if (!LIST_EMPTY(&lp->nfsl_lock)) {
 3908                                 needsrecall = 1;
 3909                                 break;
 3910                             }
 3911                         }
 3912                     }
 3913                     if (needsrecall && !triedrecall) {
 3914                         islept = 0;
 3915                         while (!igotlock) {
 3916                             igotlock = nfsv4_lock(&clp->nfsc_lock, 1,
 3917                                 &islept, NFSCLSTATEMUTEXPTR);
 3918                             if (islept)
 3919                                 break;
 3920                         }
 3921                         if (islept)
 3922                             continue;
 3923                         NFSUNLOCKCLSTATE();
 3924                         cred = newnfs_getcred();
 3925                         newnfs_copycred(&dp->nfsdl_cred, cred);
 3926                         (void) nfscl_recalldeleg(clp, nmp, dp, fvp, cred, p);
 3927                         NFSFREECRED(cred);
 3928                         triedrecall = 1;
 3929                         NFSLOCKCLSTATE();
 3930                         nfsv4_unlock(&clp->nfsc_lock, 0);
 3931                         igotlock = 0;
 3932                         continue;
 3933                     }
 3934                     *fstp = dp->nfsdl_stateid;
 3935                     retcnt++;
 3936                     *gotfdp = 1;
 3937                     nfscl_cleandeleg(dp);
 3938                     nfscl_freedeleg(&clp->nfsc_deleg, dp);
 3939                 }
 3940                 if (igotlock) {
 3941                     nfsv4_unlock(&clp->nfsc_lock, 0);
 3942                     igotlock = 0;
 3943                 }
 3944                 if (tvp != NULL) {
 3945                     np = VTONFS(tvp);
 3946                     dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh,
 3947                         np->n_fhp->nfh_len);
 3948                     if (dp != NULL && *gottdp == 0) {
 3949                         /*
 3950                          * Wait for outstanding I/O ops to be done.
 3951                          */
 3952                         if (dp->nfsdl_rwlock.nfslock_usecnt > 0) {
 3953                             dp->nfsdl_rwlock.nfslock_lock |= NFSV4LOCK_WANTED;
 3954                             (void) nfsmsleep(&dp->nfsdl_rwlock,
 3955                                 NFSCLSTATEMUTEXPTR, PZERO, "nfscld", NULL);
 3956                             continue;
 3957                         }
 3958                         LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
 3959                             if (!LIST_EMPTY(&owp->nfsow_open)) {
 3960                                 NFSUNLOCKCLSTATE();
 3961                                 return (retcnt);
 3962                             }
 3963                         }
 3964                         LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
 3965                             if (!LIST_EMPTY(&lp->nfsl_lock)) {
 3966                                 NFSUNLOCKCLSTATE();
 3967                                 return (retcnt);
 3968                             }
 3969                         }
 3970                         *tstp = dp->nfsdl_stateid;
 3971                         retcnt++;
 3972                         *gottdp = 1;
 3973                         nfscl_cleandeleg(dp);
 3974                         nfscl_freedeleg(&clp->nfsc_deleg, dp);
 3975                     }
 3976                 }
 3977                 NFSUNLOCKCLSTATE();
 3978                 return (retcnt);
 3979         }
 3980 }
 3981 
 3982 /*
 3983  * Get a reference on the clientid associated with the mount point.
 3984  * Return 1 if success, 0 otherwise.
 3985  */
 3986 APPLESTATIC int
 3987 nfscl_getref(struct nfsmount *nmp)
 3988 {
 3989         struct nfsclclient *clp;
 3990 
 3991         NFSLOCKCLSTATE();
 3992         clp = nfscl_findcl(nmp);
 3993         if (clp == NULL) {
 3994                 NFSUNLOCKCLSTATE();
 3995                 return (0);
 3996         }
 3997         nfsv4_getref(&clp->nfsc_lock, NULL, NFSCLSTATEMUTEXPTR);
 3998         NFSUNLOCKCLSTATE();
 3999         return (1);
 4000 }
 4001 
 4002 /*
 4003  * Release a reference on a clientid acquired with the above call.
 4004  */
 4005 APPLESTATIC void
 4006 nfscl_relref(struct nfsmount *nmp)
 4007 {
 4008         struct nfsclclient *clp;
 4009 
 4010         NFSLOCKCLSTATE();
 4011         clp = nfscl_findcl(nmp);
 4012         if (clp == NULL) {
 4013                 NFSUNLOCKCLSTATE();
 4014                 return;
 4015         }
 4016         nfsv4_relref(&clp->nfsc_lock);
 4017         NFSUNLOCKCLSTATE();
 4018 }
 4019 
 4020 /*
 4021  * Save the size attribute in the delegation, since the nfsnode
 4022  * is going away.
 4023  */
 4024 APPLESTATIC void
 4025 nfscl_reclaimnode(vnode_t vp)
 4026 {
 4027         struct nfsclclient *clp;
 4028         struct nfscldeleg *dp;
 4029         struct nfsnode *np = VTONFS(vp);
 4030         struct nfsmount *nmp;
 4031 
 4032         nmp = VFSTONFS(vnode_mount(vp));
 4033         if (!NFSHASNFSV4(nmp))
 4034                 return;
 4035         NFSLOCKCLSTATE();
 4036         clp = nfscl_findcl(nmp);
 4037         if (clp == NULL) {
 4038                 NFSUNLOCKCLSTATE();
 4039                 return;
 4040         }
 4041         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 4042         if (dp != NULL && (dp->nfsdl_flags & NFSCLDL_WRITE))
 4043                 dp->nfsdl_size = np->n_size;
 4044         NFSUNLOCKCLSTATE();
 4045 }
 4046 
 4047 /*
 4048  * Get the saved size attribute in the delegation, since it is a
 4049  * newly allocated nfsnode.
 4050  */
 4051 APPLESTATIC void
 4052 nfscl_newnode(vnode_t vp)
 4053 {
 4054         struct nfsclclient *clp;
 4055         struct nfscldeleg *dp;
 4056         struct nfsnode *np = VTONFS(vp);
 4057         struct nfsmount *nmp;
 4058 
 4059         nmp = VFSTONFS(vnode_mount(vp));
 4060         if (!NFSHASNFSV4(nmp))
 4061                 return;
 4062         NFSLOCKCLSTATE();
 4063         clp = nfscl_findcl(nmp);
 4064         if (clp == NULL) {
 4065                 NFSUNLOCKCLSTATE();
 4066                 return;
 4067         }
 4068         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 4069         if (dp != NULL && (dp->nfsdl_flags & NFSCLDL_WRITE))
 4070                 np->n_size = dp->nfsdl_size;
 4071         NFSUNLOCKCLSTATE();
 4072 }
 4073 
 4074 /*
 4075  * If there is a valid write delegation for this file, set the modtime
 4076  * to the local clock time.
 4077  */
 4078 APPLESTATIC void
 4079 nfscl_delegmodtime(vnode_t vp)
 4080 {
 4081         struct nfsclclient *clp;
 4082         struct nfscldeleg *dp;
 4083         struct nfsnode *np = VTONFS(vp);
 4084         struct nfsmount *nmp;
 4085 
 4086         nmp = VFSTONFS(vnode_mount(vp));
 4087         if (!NFSHASNFSV4(nmp))
 4088                 return;
 4089         NFSLOCKCLSTATE();
 4090         clp = nfscl_findcl(nmp);
 4091         if (clp == NULL) {
 4092                 NFSUNLOCKCLSTATE();
 4093                 return;
 4094         }
 4095         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 4096         if (dp != NULL && (dp->nfsdl_flags & NFSCLDL_WRITE)) {
 4097                 NFSGETNANOTIME(&dp->nfsdl_modtime);
 4098                 dp->nfsdl_flags |= NFSCLDL_MODTIMESET;
 4099         }
 4100         NFSUNLOCKCLSTATE();
 4101 }
 4102 
 4103 /*
 4104  * If there is a valid write delegation for this file with a modtime set,
 4105  * put that modtime in mtime.
 4106  */
 4107 APPLESTATIC void
 4108 nfscl_deleggetmodtime(vnode_t vp, struct timespec *mtime)
 4109 {
 4110         struct nfsclclient *clp;
 4111         struct nfscldeleg *dp;
 4112         struct nfsnode *np = VTONFS(vp);
 4113         struct nfsmount *nmp;
 4114 
 4115         nmp = VFSTONFS(vnode_mount(vp));
 4116         if (!NFSHASNFSV4(nmp))
 4117                 return;
 4118         NFSLOCKCLSTATE();
 4119         clp = nfscl_findcl(nmp);
 4120         if (clp == NULL) {
 4121                 NFSUNLOCKCLSTATE();
 4122                 return;
 4123         }
 4124         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 4125         if (dp != NULL &&
 4126             (dp->nfsdl_flags & (NFSCLDL_WRITE | NFSCLDL_MODTIMESET)) ==
 4127             (NFSCLDL_WRITE | NFSCLDL_MODTIMESET))
 4128                 *mtime = dp->nfsdl_modtime;
 4129         NFSUNLOCKCLSTATE();
 4130 }
 4131 
 4132 static int
 4133 nfscl_errmap(struct nfsrv_descript *nd)
 4134 {
 4135         short *defaulterrp, *errp;
 4136 
 4137         if (!nd->nd_repstat)
 4138                 return (0);
 4139         if (nd->nd_procnum == NFSPROC_NOOP)
 4140                 return (txdr_unsigned(nd->nd_repstat & 0xffff));
 4141         if (nd->nd_repstat == EBADRPC)
 4142                 return (txdr_unsigned(NFSERR_BADXDR));
 4143         if (nd->nd_repstat == NFSERR_MINORVERMISMATCH ||
 4144             nd->nd_repstat == NFSERR_OPILLEGAL)
 4145                 return (txdr_unsigned(nd->nd_repstat));
 4146         errp = defaulterrp = nfscl_cberrmap[nd->nd_procnum];
 4147         while (*++errp)
 4148                 if (*errp == (short)nd->nd_repstat)
 4149                         return (txdr_unsigned(nd->nd_repstat));
 4150         return (txdr_unsigned(*defaulterrp));
 4151 }
 4152 

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