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/11.1/sys/fs/nfsclient/nfs_clstate.c 318127 2017-05-10 01:28:58Z rmacklem $");
   30 
   31 /*
   32  * These functions implement the client side state handling for NFSv4.
   33  * NFSv4 state handling:
   34  * - A lockowner is used to determine lock contention, so it
   35  *   corresponds directly to a Posix pid. (1 to 1 mapping)
   36  * - The correct granularity of an OpenOwner is not nearly so
   37  *   obvious. An OpenOwner does the following:
   38  *   - provides a serial sequencing of Open/Close/Lock-with-new-lockowner
   39  *   - is used to check for Open/Share contention (not applicable to
   40  *     this client, since all Opens are Deny_None)
   41  *   As such, I considered both extreme.
   42  *   1 OpenOwner per ClientID - Simple to manage, but fully serializes
   43  *   all Open, Close and Lock (with a new lockowner) Ops.
   44  *   1 OpenOwner for each Open - This one results in an OpenConfirm for
   45  *   every Open, for most servers.
   46  *   So, I chose to use the same mapping as I did for LockOwnwers.
   47  *   The main concern here is that you can end up with multiple Opens
   48  *   for the same File Handle, but on different OpenOwners (opens
   49  *   inherited from parents, grandparents...) and you do not know
   50  *   which of these the vnodeop close applies to. This is handled by
   51  *   delaying the Close Op(s) until all of the Opens have been closed.
   52  *   (It is not yet obvious if this is the correct granularity.)
   53  * - How the code handles serialization:
   54  *   - For the ClientId, it uses an exclusive lock while getting its
   55  *     SetClientId and during recovery. Otherwise, it uses a shared
   56  *     lock via a reference count.
   57  *   - For the rest of the data structures, it uses an SMP mutex
   58  *     (once the nfs client is SMP safe) and doesn't sleep while
   59  *     manipulating the linked lists.
   60  *   - The serialization of Open/Close/Lock/LockU falls out in the
   61  *     "wash", since OpenOwners and LockOwners are both mapped from
   62  *     Posix pid. In other words, there is only one Posix pid using
   63  *     any given owner, so that owner is serialized. (If you change
   64  *     the granularity of the OpenOwner, then code must be added to
   65  *     serialize Ops on the OpenOwner.)
   66  * - When to get rid of OpenOwners and LockOwners.
   67  *   - The function nfscl_cleanup_common() is executed after a process exits.
   68  *     It goes 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 nfsstatsv1 nfsstatsv1;
   88 extern struct nfsreqhead nfsd_reqq;
   89 extern u_int32_t newnfs_false, newnfs_true;
   90 extern int nfscl_debuglevel;
   91 extern int nfscl_enablecallb;
   92 extern int nfs_numnfscbd;
   93 NFSREQSPINLOCK;
   94 NFSCLSTATEMUTEX;
   95 int nfscl_inited = 0;
   96 struct nfsclhead nfsclhead;     /* Head of clientid list */
   97 int nfscl_deleghighwater = NFSCLDELEGHIGHWATER;
   98 int nfscl_layouthighwater = NFSCLLAYOUTHIGHWATER;
   99 #endif  /* !APPLEKEXT */
  100 
  101 static int nfscl_delegcnt = 0;
  102 static int nfscl_layoutcnt = 0;
  103 static int nfscl_getopen(struct nfsclownerhead *, u_int8_t *, int, u_int8_t *,
  104     u_int8_t *, u_int32_t, struct nfscllockowner **, struct nfsclopen **);
  105 static void nfscl_clrelease(struct nfsclclient *);
  106 static void nfscl_cleanclient(struct nfsclclient *);
  107 static void nfscl_expireclient(struct nfsclclient *, struct nfsmount *,
  108     struct ucred *, NFSPROC_T *);
  109 static int nfscl_expireopen(struct nfsclclient *, struct nfsclopen *,
  110     struct nfsmount *, struct ucred *, NFSPROC_T *);
  111 static void nfscl_recover(struct nfsclclient *, struct ucred *, NFSPROC_T *);
  112 static void nfscl_insertlock(struct nfscllockowner *, struct nfscllock *,
  113     struct nfscllock *, int);
  114 static int nfscl_updatelock(struct nfscllockowner *, struct nfscllock **,
  115     struct nfscllock **, int);
  116 static void nfscl_delegreturnall(struct nfsclclient *, NFSPROC_T *);
  117 static u_int32_t nfscl_nextcbident(void);
  118 static mount_t nfscl_getmnt(int, uint8_t *, u_int32_t, struct nfsclclient **);
  119 static struct nfsclclient *nfscl_getclnt(u_int32_t);
  120 static struct nfsclclient *nfscl_getclntsess(uint8_t *);
  121 static struct nfscldeleg *nfscl_finddeleg(struct nfsclclient *, u_int8_t *,
  122     int);
  123 static void nfscl_retoncloselayout(vnode_t, struct nfsclclient *, uint8_t *,
  124     int, struct nfsclrecalllayout **);
  125 static void nfscl_reldevinfo_locked(struct nfscldevinfo *);
  126 static struct nfscllayout *nfscl_findlayout(struct nfsclclient *, u_int8_t *,
  127     int);
  128 static struct nfscldevinfo *nfscl_finddevinfo(struct nfsclclient *, uint8_t *);
  129 static int nfscl_checkconflict(struct nfscllockownerhead *, struct nfscllock *,
  130     u_int8_t *, struct nfscllock **);
  131 static void nfscl_freealllocks(struct nfscllockownerhead *, int);
  132 static int nfscl_localconflict(struct nfsclclient *, u_int8_t *, int,
  133     struct nfscllock *, u_int8_t *, struct nfscldeleg *, struct nfscllock **);
  134 static void nfscl_newopen(struct nfsclclient *, struct nfscldeleg *,
  135     struct nfsclowner **, struct nfsclowner **, struct nfsclopen **,
  136     struct nfsclopen **, u_int8_t *, u_int8_t *, int, int *);
  137 static int nfscl_moveopen(vnode_t , struct nfsclclient *,
  138     struct nfsmount *, struct nfsclopen *, struct nfsclowner *,
  139     struct nfscldeleg *, struct ucred *, NFSPROC_T *);
  140 static void nfscl_totalrecall(struct nfsclclient *);
  141 static int nfscl_relock(vnode_t , struct nfsclclient *, struct nfsmount *,
  142     struct nfscllockowner *, struct nfscllock *, struct ucred *, NFSPROC_T *);
  143 static int nfscl_tryopen(struct nfsmount *, vnode_t , u_int8_t *, int,
  144     u_int8_t *, int, u_int32_t, struct nfsclopen *, u_int8_t *, int,
  145     struct nfscldeleg **, int, u_int32_t, struct ucred *, NFSPROC_T *);
  146 static int nfscl_trylock(struct nfsmount *, vnode_t , u_int8_t *,
  147     int, struct nfscllockowner *, int, int, u_int64_t, u_int64_t, short,
  148     struct ucred *, NFSPROC_T *);
  149 static int nfsrpc_reopen(struct nfsmount *, u_int8_t *, int, u_int32_t,
  150     struct nfsclopen *, struct nfscldeleg **, struct ucred *, NFSPROC_T *);
  151 static void nfscl_freedeleg(struct nfscldeleghead *, struct nfscldeleg *);
  152 static int nfscl_errmap(struct nfsrv_descript *, u_int32_t);
  153 static void nfscl_cleanup_common(struct nfsclclient *, u_int8_t *);
  154 static int nfscl_recalldeleg(struct nfsclclient *, struct nfsmount *,
  155     struct nfscldeleg *, vnode_t, struct ucred *, NFSPROC_T *, int);
  156 static void nfscl_freeopenowner(struct nfsclowner *, int);
  157 static void nfscl_cleandeleg(struct nfscldeleg *);
  158 static int nfscl_trydelegreturn(struct nfscldeleg *, struct ucred *,
  159     struct nfsmount *, NFSPROC_T *);
  160 static void nfscl_emptylockowner(struct nfscllockowner *,
  161     struct nfscllockownerfhhead *);
  162 static void nfscl_mergeflayouts(struct nfsclflayouthead *,
  163     struct nfsclflayouthead *);
  164 static int nfscl_layoutrecall(int, struct nfscllayout *, uint32_t, uint64_t,
  165     uint64_t, uint32_t, struct nfsclrecalllayout *);
  166 static int nfscl_seq(uint32_t, uint32_t);
  167 static void nfscl_layoutreturn(struct nfsmount *, struct nfscllayout *,
  168     struct ucred *, NFSPROC_T *);
  169 static void nfscl_dolayoutcommit(struct nfsmount *, struct nfscllayout *,
  170     struct ucred *, NFSPROC_T *);
  171 
  172 static short nfscberr_null[] = {
  173         0,
  174         0,
  175 };
  176 
  177 static short nfscberr_getattr[] = {
  178         NFSERR_RESOURCE,
  179         NFSERR_BADHANDLE,
  180         NFSERR_BADXDR,
  181         NFSERR_RESOURCE,
  182         NFSERR_SERVERFAULT,
  183         0,
  184 };
  185 
  186 static short nfscberr_recall[] = {
  187         NFSERR_RESOURCE,
  188         NFSERR_BADHANDLE,
  189         NFSERR_BADSTATEID,
  190         NFSERR_BADXDR,
  191         NFSERR_RESOURCE,
  192         NFSERR_SERVERFAULT,
  193         0,
  194 };
  195 
  196 static short *nfscl_cberrmap[] = {
  197         nfscberr_null,
  198         nfscberr_null,
  199         nfscberr_null,
  200         nfscberr_getattr,
  201         nfscberr_recall
  202 };
  203 
  204 #define NETFAMILY(clp) \
  205                 (((clp)->nfsc_flags & NFSCLFLAGS_AFINET6) ? AF_INET6 : AF_INET)
  206 
  207 /*
  208  * Called for an open operation.
  209  * If the nfhp argument is NULL, just get an openowner.
  210  */
  211 APPLESTATIC int
  212 nfscl_open(vnode_t vp, u_int8_t *nfhp, int fhlen, u_int32_t amode, int usedeleg,
  213     struct ucred *cred, NFSPROC_T *p, struct nfsclowner **owpp,
  214     struct nfsclopen **opp, int *newonep, int *retp, int lockit)
  215 {
  216         struct nfsclclient *clp;
  217         struct nfsclowner *owp, *nowp;
  218         struct nfsclopen *op = NULL, *nop = NULL;
  219         struct nfscldeleg *dp;
  220         struct nfsclownerhead *ohp;
  221         u_int8_t own[NFSV4CL_LOCKNAMELEN];
  222         int ret;
  223 
  224         if (newonep != NULL)
  225                 *newonep = 0;
  226         if (opp != NULL)
  227                 *opp = NULL;
  228         if (owpp != NULL)
  229                 *owpp = NULL;
  230 
  231         /*
  232          * Might need one or both of these, so MALLOC them now, to
  233          * avoid a tsleep() in MALLOC later.
  234          */
  235         MALLOC(nowp, struct nfsclowner *, sizeof (struct nfsclowner),
  236             M_NFSCLOWNER, M_WAITOK);
  237         if (nfhp != NULL)
  238             MALLOC(nop, struct nfsclopen *, sizeof (struct nfsclopen) +
  239                 fhlen - 1, M_NFSCLOPEN, M_WAITOK);
  240         ret = nfscl_getcl(vnode_mount(vp), cred, p, 1, &clp);
  241         if (ret != 0) {
  242                 FREE((caddr_t)nowp, M_NFSCLOWNER);
  243                 if (nop != NULL)
  244                         FREE((caddr_t)nop, M_NFSCLOPEN);
  245                 return (ret);
  246         }
  247 
  248         /*
  249          * Get the Open iff it already exists.
  250          * If none found, add the new one or return error, depending upon
  251          * "create".
  252          */
  253         NFSLOCKCLSTATE();
  254         dp = NULL;
  255         /* First check the delegation list */
  256         if (nfhp != NULL && usedeleg) {
  257                 LIST_FOREACH(dp, NFSCLDELEGHASH(clp, nfhp, fhlen), nfsdl_hash) {
  258                         if (dp->nfsdl_fhlen == fhlen &&
  259                             !NFSBCMP(nfhp, dp->nfsdl_fh, fhlen)) {
  260                                 if (!(amode & NFSV4OPEN_ACCESSWRITE) ||
  261                                     (dp->nfsdl_flags & NFSCLDL_WRITE))
  262                                         break;
  263                                 dp = NULL;
  264                                 break;
  265                         }
  266                 }
  267         }
  268 
  269         if (dp != NULL) {
  270                 nfscl_filllockowner(p->td_proc, own, F_POSIX);
  271                 ohp = &dp->nfsdl_owner;
  272         } else {
  273                 /* For NFSv4.1 and this option, use a single open_owner. */
  274                 if (NFSHASONEOPENOWN(VFSTONFS(vnode_mount(vp))))
  275                         nfscl_filllockowner(NULL, own, F_POSIX);
  276                 else
  277                         nfscl_filllockowner(p->td_proc, own, F_POSIX);
  278                 ohp = &clp->nfsc_owner;
  279         }
  280         /* Now, search for an openowner */
  281         LIST_FOREACH(owp, ohp, nfsow_list) {
  282                 if (!NFSBCMP(owp->nfsow_owner, own, NFSV4CL_LOCKNAMELEN))
  283                         break;
  284         }
  285 
  286         /*
  287          * Create a new open, as required.
  288          */
  289         nfscl_newopen(clp, dp, &owp, &nowp, &op, &nop, own, nfhp, fhlen,
  290             newonep);
  291 
  292         /*
  293          * Now, check the mode on the open and return the appropriate
  294          * value.
  295          */
  296         if (retp != NULL) {
  297                 if (nfhp != NULL && dp != NULL && nop == NULL)
  298                         /* new local open on delegation */
  299                         *retp = NFSCLOPEN_SETCRED;
  300                 else
  301                         *retp = NFSCLOPEN_OK;
  302         }
  303         if (op != NULL && (amode & ~(op->nfso_mode))) {
  304                 op->nfso_mode |= amode;
  305                 if (retp != NULL && dp == NULL)
  306                         *retp = NFSCLOPEN_DOOPEN;
  307         }
  308 
  309         /*
  310          * Serialize modifications to the open owner for multiple threads
  311          * within the same process using a read/write sleep lock.
  312          * For NFSv4.1 and a single OpenOwner, allow concurrent open operations
  313          * by acquiring a shared lock.  The close operations still use an
  314          * exclusive lock for this case.
  315          */
  316         if (lockit != 0) {
  317                 if (NFSHASONEOPENOWN(VFSTONFS(vnode_mount(vp)))) {
  318                         /*
  319                          * Get a shared lock on the OpenOwner, but first
  320                          * wait for any pending exclusive lock, so that the
  321                          * exclusive locker gets priority.
  322                          */
  323                         nfsv4_lock(&owp->nfsow_rwlock, 0, NULL,
  324                             NFSCLSTATEMUTEXPTR, NULL);
  325                         nfsv4_getref(&owp->nfsow_rwlock, NULL,
  326                             NFSCLSTATEMUTEXPTR, NULL);
  327                 } else
  328                         nfscl_lockexcl(&owp->nfsow_rwlock, NFSCLSTATEMUTEXPTR);
  329         }
  330         NFSUNLOCKCLSTATE();
  331         if (nowp != NULL)
  332                 FREE((caddr_t)nowp, M_NFSCLOWNER);
  333         if (nop != NULL)
  334                 FREE((caddr_t)nop, M_NFSCLOPEN);
  335         if (owpp != NULL)
  336                 *owpp = owp;
  337         if (opp != NULL)
  338                 *opp = op;
  339         return (0);
  340 }
  341 
  342 /*
  343  * Create a new open, as required.
  344  */
  345 static void
  346 nfscl_newopen(struct nfsclclient *clp, struct nfscldeleg *dp,
  347     struct nfsclowner **owpp, struct nfsclowner **nowpp, struct nfsclopen **opp,
  348     struct nfsclopen **nopp, u_int8_t *own, u_int8_t *fhp, int fhlen,
  349     int *newonep)
  350 {
  351         struct nfsclowner *owp = *owpp, *nowp;
  352         struct nfsclopen *op, *nop;
  353 
  354         if (nowpp != NULL)
  355                 nowp = *nowpp;
  356         else
  357                 nowp = NULL;
  358         if (nopp != NULL)
  359                 nop = *nopp;
  360         else
  361                 nop = NULL;
  362         if (owp == NULL && nowp != NULL) {
  363                 NFSBCOPY(own, nowp->nfsow_owner, NFSV4CL_LOCKNAMELEN);
  364                 LIST_INIT(&nowp->nfsow_open);
  365                 nowp->nfsow_clp = clp;
  366                 nowp->nfsow_seqid = 0;
  367                 nowp->nfsow_defunct = 0;
  368                 nfscl_lockinit(&nowp->nfsow_rwlock);
  369                 if (dp != NULL) {
  370                         nfsstatsv1.cllocalopenowners++;
  371                         LIST_INSERT_HEAD(&dp->nfsdl_owner, nowp, nfsow_list);
  372                 } else {
  373                         nfsstatsv1.clopenowners++;
  374                         LIST_INSERT_HEAD(&clp->nfsc_owner, nowp, nfsow_list);
  375                 }
  376                 owp = *owpp = nowp;
  377                 *nowpp = NULL;
  378                 if (newonep != NULL)
  379                         *newonep = 1;
  380         }
  381 
  382          /* If an fhp has been specified, create an Open as well. */
  383         if (fhp != NULL) {
  384                 /* and look for the correct open, based upon FH */
  385                 LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
  386                         if (op->nfso_fhlen == fhlen &&
  387                             !NFSBCMP(op->nfso_fh, fhp, fhlen))
  388                                 break;
  389                 }
  390                 if (op == NULL && nop != NULL) {
  391                         nop->nfso_own = owp;
  392                         nop->nfso_mode = 0;
  393                         nop->nfso_opencnt = 0;
  394                         nop->nfso_posixlock = 1;
  395                         nop->nfso_fhlen = fhlen;
  396                         NFSBCOPY(fhp, nop->nfso_fh, fhlen);
  397                         LIST_INIT(&nop->nfso_lock);
  398                         nop->nfso_stateid.seqid = 0;
  399                         nop->nfso_stateid.other[0] = 0;
  400                         nop->nfso_stateid.other[1] = 0;
  401                         nop->nfso_stateid.other[2] = 0;
  402                         if (dp != NULL) {
  403                                 TAILQ_REMOVE(&clp->nfsc_deleg, dp, nfsdl_list);
  404                                 TAILQ_INSERT_HEAD(&clp->nfsc_deleg, dp,
  405                                     nfsdl_list);
  406                                 dp->nfsdl_timestamp = NFSD_MONOSEC + 120;
  407                                 nfsstatsv1.cllocalopens++;
  408                         } else {
  409                                 nfsstatsv1.clopens++;
  410                         }
  411                         LIST_INSERT_HEAD(&owp->nfsow_open, nop, nfso_list);
  412                         *opp = nop;
  413                         *nopp = NULL;
  414                         if (newonep != NULL)
  415                                 *newonep = 1;
  416                 } else {
  417                         *opp = op;
  418                 }
  419         }
  420 }
  421 
  422 /*
  423  * Called to find/add a delegation to a client.
  424  */
  425 APPLESTATIC int
  426 nfscl_deleg(mount_t mp, struct nfsclclient *clp, u_int8_t *nfhp,
  427     int fhlen, struct ucred *cred, NFSPROC_T *p, struct nfscldeleg **dpp)
  428 {
  429         struct nfscldeleg *dp = *dpp, *tdp;
  430 
  431         /*
  432          * First, if we have received a Read delegation for a file on a
  433          * read/write file system, just return it, because they aren't
  434          * useful, imho.
  435          */
  436         if (mp != NULL && dp != NULL && !NFSMNT_RDONLY(mp) &&
  437             (dp->nfsdl_flags & NFSCLDL_READ)) {
  438                 (void) nfscl_trydelegreturn(dp, cred, VFSTONFS(mp), p);
  439                 FREE((caddr_t)dp, M_NFSCLDELEG);
  440                 *dpp = NULL;
  441                 return (0);
  442         }
  443 
  444         /* Look for the correct deleg, based upon FH */
  445         NFSLOCKCLSTATE();
  446         tdp = nfscl_finddeleg(clp, nfhp, fhlen);
  447         if (tdp == NULL) {
  448                 if (dp == NULL) {
  449                         NFSUNLOCKCLSTATE();
  450                         return (NFSERR_BADSTATEID);
  451                 }
  452                 *dpp = NULL;
  453                 TAILQ_INSERT_HEAD(&clp->nfsc_deleg, dp, nfsdl_list);
  454                 LIST_INSERT_HEAD(NFSCLDELEGHASH(clp, nfhp, fhlen), dp,
  455                     nfsdl_hash);
  456                 dp->nfsdl_timestamp = NFSD_MONOSEC + 120;
  457                 nfsstatsv1.cldelegates++;
  458                 nfscl_delegcnt++;
  459         } else {
  460                 /*
  461                  * Delegation already exists, what do we do if a new one??
  462                  */
  463                 if (dp != NULL) {
  464                         printf("Deleg already exists!\n");
  465                         FREE((caddr_t)dp, M_NFSCLDELEG);
  466                         *dpp = NULL;
  467                 } else {
  468                         *dpp = tdp;
  469                 }
  470         }
  471         NFSUNLOCKCLSTATE();
  472         return (0);
  473 }
  474 
  475 /*
  476  * Find a delegation for this file handle. Return NULL upon failure.
  477  */
  478 static struct nfscldeleg *
  479 nfscl_finddeleg(struct nfsclclient *clp, u_int8_t *fhp, int fhlen)
  480 {
  481         struct nfscldeleg *dp;
  482 
  483         LIST_FOREACH(dp, NFSCLDELEGHASH(clp, fhp, fhlen), nfsdl_hash) {
  484             if (dp->nfsdl_fhlen == fhlen &&
  485                 !NFSBCMP(dp->nfsdl_fh, fhp, fhlen))
  486                 break;
  487         }
  488         return (dp);
  489 }
  490 
  491 /*
  492  * Get a stateid for an I/O operation. First, look for an open and iff
  493  * found, return either a lockowner stateid or the open stateid.
  494  * If no Open is found, just return error and the special stateid of all zeros.
  495  */
  496 APPLESTATIC int
  497 nfscl_getstateid(vnode_t vp, u_int8_t *nfhp, int fhlen, u_int32_t mode,
  498     int fords, struct ucred *cred, NFSPROC_T *p, nfsv4stateid_t *stateidp,
  499     void **lckpp)
  500 {
  501         struct nfsclclient *clp;
  502         struct nfsclowner *owp;
  503         struct nfsclopen *op = NULL, *top;
  504         struct nfscllockowner *lp;
  505         struct nfscldeleg *dp;
  506         struct nfsnode *np;
  507         struct nfsmount *nmp;
  508         u_int8_t own[NFSV4CL_LOCKNAMELEN];
  509         int error, done;
  510 
  511         *lckpp = NULL;
  512         /*
  513          * Initially, just set the special stateid of all zeros.
  514          * (Don't do this for a DS, since the special stateid can't be used.)
  515          */
  516         if (fords == 0) {
  517                 stateidp->seqid = 0;
  518                 stateidp->other[0] = 0;
  519                 stateidp->other[1] = 0;
  520                 stateidp->other[2] = 0;
  521         }
  522         if (vnode_vtype(vp) != VREG)
  523                 return (EISDIR);
  524         np = VTONFS(vp);
  525         nmp = VFSTONFS(vnode_mount(vp));
  526         NFSLOCKCLSTATE();
  527         clp = nfscl_findcl(nmp);
  528         if (clp == NULL) {
  529                 NFSUNLOCKCLSTATE();
  530                 return (EACCES);
  531         }
  532 
  533         /*
  534          * Wait for recovery to complete.
  535          */
  536         while ((clp->nfsc_flags & NFSCLFLAGS_RECVRINPROG))
  537                 (void) nfsmsleep(&clp->nfsc_flags, NFSCLSTATEMUTEXPTR,
  538                     PZERO, "nfsrecvr", NULL);
  539 
  540         /*
  541          * First, look for a delegation.
  542          */
  543         LIST_FOREACH(dp, NFSCLDELEGHASH(clp, nfhp, fhlen), nfsdl_hash) {
  544                 if (dp->nfsdl_fhlen == fhlen &&
  545                     !NFSBCMP(nfhp, dp->nfsdl_fh, fhlen)) {
  546                         if (!(mode & NFSV4OPEN_ACCESSWRITE) ||
  547                             (dp->nfsdl_flags & NFSCLDL_WRITE)) {
  548                                 stateidp->seqid = dp->nfsdl_stateid.seqid;
  549                                 stateidp->other[0] = dp->nfsdl_stateid.other[0];
  550                                 stateidp->other[1] = dp->nfsdl_stateid.other[1];
  551                                 stateidp->other[2] = dp->nfsdl_stateid.other[2];
  552                                 if (!(np->n_flag & NDELEGRECALL)) {
  553                                         TAILQ_REMOVE(&clp->nfsc_deleg, dp,
  554                                             nfsdl_list);
  555                                         TAILQ_INSERT_HEAD(&clp->nfsc_deleg, dp,
  556                                             nfsdl_list);
  557                                         dp->nfsdl_timestamp = NFSD_MONOSEC +
  558                                             120;
  559                                         dp->nfsdl_rwlock.nfslock_usecnt++;
  560                                         *lckpp = (void *)&dp->nfsdl_rwlock;
  561                                 }
  562                                 NFSUNLOCKCLSTATE();
  563                                 return (0);
  564                         }
  565                         break;
  566                 }
  567         }
  568 
  569         if (p != NULL) {
  570                 /*
  571                  * If p != NULL, we want to search the parentage tree
  572                  * for a matching OpenOwner and use that.
  573                  */
  574                 if (NFSHASONEOPENOWN(VFSTONFS(vnode_mount(vp))))
  575                         nfscl_filllockowner(NULL, own, F_POSIX);
  576                 else
  577                         nfscl_filllockowner(p->td_proc, own, F_POSIX);
  578                 lp = NULL;
  579                 error = nfscl_getopen(&clp->nfsc_owner, nfhp, fhlen, own, own,
  580                     mode, &lp, &op);
  581                 if (error == 0 && lp != NULL && fords == 0) {
  582                         /* Don't return a lock stateid for a DS. */
  583                         stateidp->seqid =
  584                             lp->nfsl_stateid.seqid;
  585                         stateidp->other[0] =
  586                             lp->nfsl_stateid.other[0];
  587                         stateidp->other[1] =
  588                             lp->nfsl_stateid.other[1];
  589                         stateidp->other[2] =
  590                             lp->nfsl_stateid.other[2];
  591                         NFSUNLOCKCLSTATE();
  592                         return (0);
  593                 }
  594         }
  595         if (op == NULL) {
  596                 /* If not found, just look for any OpenOwner that will work. */
  597                 top = NULL;
  598                 done = 0;
  599                 owp = LIST_FIRST(&clp->nfsc_owner);
  600                 while (!done && owp != NULL) {
  601                         LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
  602                                 if (op->nfso_fhlen == fhlen &&
  603                                     !NFSBCMP(op->nfso_fh, nfhp, fhlen)) {
  604                                         if (top == NULL && (op->nfso_mode &
  605                                             NFSV4OPEN_ACCESSWRITE) != 0 &&
  606                                             (mode & NFSV4OPEN_ACCESSREAD) != 0)
  607                                                 top = op;
  608                                         if ((mode & op->nfso_mode) == mode) {
  609                                                 done = 1;
  610                                                 break;
  611                                         }
  612                                 }
  613                         }
  614                         if (!done)
  615                                 owp = LIST_NEXT(owp, nfsow_list);
  616                 }
  617                 if (!done) {
  618                         NFSCL_DEBUG(2, "openmode top=%p\n", top);
  619                         if (top == NULL || NFSHASOPENMODE(nmp)) {
  620                                 NFSUNLOCKCLSTATE();
  621                                 return (ENOENT);
  622                         } else
  623                                 op = top;
  624                 }
  625                 /*
  626                  * For read aheads or write behinds, use the open cred.
  627                  * A read ahead or write behind is indicated by p == NULL.
  628                  */
  629                 if (p == NULL)
  630                         newnfs_copycred(&op->nfso_cred, cred);
  631         }
  632 
  633         /*
  634          * No lock stateid, so return the open stateid.
  635          */
  636         stateidp->seqid = op->nfso_stateid.seqid;
  637         stateidp->other[0] = op->nfso_stateid.other[0];
  638         stateidp->other[1] = op->nfso_stateid.other[1];
  639         stateidp->other[2] = op->nfso_stateid.other[2];
  640         NFSUNLOCKCLSTATE();
  641         return (0);
  642 }
  643 
  644 /*
  645  * Search for a matching file, mode and, optionally, lockowner.
  646  */
  647 static int
  648 nfscl_getopen(struct nfsclownerhead *ohp, u_int8_t *nfhp, int fhlen,
  649     u_int8_t *openown, u_int8_t *lockown, u_int32_t mode,
  650     struct nfscllockowner **lpp, struct nfsclopen **opp)
  651 {
  652         struct nfsclowner *owp;
  653         struct nfsclopen *op, *rop, *rop2;
  654         struct nfscllockowner *lp;
  655         int keep_looping;
  656 
  657         if (lpp != NULL)
  658                 *lpp = NULL;
  659         /*
  660          * rop will be set to the open to be returned. There are three
  661          * variants of this, all for an open of the correct file:
  662          * 1 - A match of lockown.
  663          * 2 - A match of the openown, when no lockown match exists.
  664          * 3 - A match for any open, if no openown or lockown match exists.
  665          * Looking for #2 over #3 probably isn't necessary, but since
  666          * RFC3530 is vague w.r.t. the relationship between openowners and
  667          * lockowners, I think this is the safer way to go.
  668          */
  669         rop = NULL;
  670         rop2 = NULL;
  671         keep_looping = 1;
  672         /* Search the client list */
  673         owp = LIST_FIRST(ohp);
  674         while (owp != NULL && keep_looping != 0) {
  675                 /* and look for the correct open */
  676                 op = LIST_FIRST(&owp->nfsow_open);
  677                 while (op != NULL && keep_looping != 0) {
  678                         if (op->nfso_fhlen == fhlen &&
  679                             !NFSBCMP(op->nfso_fh, nfhp, fhlen)
  680                             && (op->nfso_mode & mode) == mode) {
  681                                 if (lpp != NULL) {
  682                                         /* Now look for a matching lockowner. */
  683                                         LIST_FOREACH(lp, &op->nfso_lock,
  684                                             nfsl_list) {
  685                                                 if (!NFSBCMP(lp->nfsl_owner,
  686                                                     lockown,
  687                                                     NFSV4CL_LOCKNAMELEN)) {
  688                                                         *lpp = lp;
  689                                                         rop = op;
  690                                                         keep_looping = 0;
  691                                                         break;
  692                                                 }
  693                                         }
  694                                 }
  695                                 if (rop == NULL && !NFSBCMP(owp->nfsow_owner,
  696                                     openown, NFSV4CL_LOCKNAMELEN)) {
  697                                         rop = op;
  698                                         if (lpp == NULL)
  699                                                 keep_looping = 0;
  700                                 }
  701                                 if (rop2 == NULL)
  702                                         rop2 = op;
  703                         }
  704                         op = LIST_NEXT(op, nfso_list);
  705                 }
  706                 owp = LIST_NEXT(owp, nfsow_list);
  707         }
  708         if (rop == NULL)
  709                 rop = rop2;
  710         if (rop == NULL)
  711                 return (EBADF);
  712         *opp = rop;
  713         return (0);
  714 }
  715 
  716 /*
  717  * Release use of an open owner. Called when open operations are done
  718  * with the open owner.
  719  */
  720 APPLESTATIC void
  721 nfscl_ownerrelease(struct nfsmount *nmp, struct nfsclowner *owp,
  722     __unused int error, __unused int candelete, int unlocked)
  723 {
  724 
  725         if (owp == NULL)
  726                 return;
  727         NFSLOCKCLSTATE();
  728         if (unlocked == 0) {
  729                 if (NFSHASONEOPENOWN(nmp))
  730                         nfsv4_relref(&owp->nfsow_rwlock);
  731                 else
  732                         nfscl_lockunlock(&owp->nfsow_rwlock);
  733         }
  734         nfscl_clrelease(owp->nfsow_clp);
  735         NFSUNLOCKCLSTATE();
  736 }
  737 
  738 /*
  739  * Release use of an open structure under an open owner.
  740  */
  741 APPLESTATIC void
  742 nfscl_openrelease(struct nfsmount *nmp, struct nfsclopen *op, int error,
  743     int candelete)
  744 {
  745         struct nfsclclient *clp;
  746         struct nfsclowner *owp;
  747 
  748         if (op == NULL)
  749                 return;
  750         NFSLOCKCLSTATE();
  751         owp = op->nfso_own;
  752         if (NFSHASONEOPENOWN(nmp))
  753                 nfsv4_relref(&owp->nfsow_rwlock);
  754         else
  755                 nfscl_lockunlock(&owp->nfsow_rwlock);
  756         clp = owp->nfsow_clp;
  757         if (error && candelete && op->nfso_opencnt == 0)
  758                 nfscl_freeopen(op, 0);
  759         nfscl_clrelease(clp);
  760         NFSUNLOCKCLSTATE();
  761 }
  762 
  763 /*
  764  * Called to get a clientid structure. It will optionally lock the
  765  * client data structures to do the SetClientId/SetClientId_confirm,
  766  * but will release that lock and return the clientid with a reference
  767  * count on it.
  768  * If the "cred" argument is NULL, a new clientid should not be created.
  769  * If the "p" argument is NULL, a SetClientID/SetClientIDConfirm cannot
  770  * be done.
  771  * The start_renewthread argument tells nfscl_getcl() to start a renew
  772  * thread if this creates a new clp.
  773  * It always clpp with a reference count on it, unless returning an error.
  774  */
  775 APPLESTATIC int
  776 nfscl_getcl(struct mount *mp, struct ucred *cred, NFSPROC_T *p,
  777     int start_renewthread, struct nfsclclient **clpp)
  778 {
  779         struct nfsclclient *clp;
  780         struct nfsclclient *newclp = NULL;
  781         struct nfsmount *nmp;
  782         char uuid[HOSTUUIDLEN];
  783         int igotlock = 0, error, trystalecnt, clidinusedelay, i;
  784         u_int16_t idlen = 0;
  785 
  786         nmp = VFSTONFS(mp);
  787         if (cred != NULL) {
  788                 getcredhostuuid(cred, uuid, sizeof uuid);
  789                 idlen = strlen(uuid);
  790                 if (idlen > 0)
  791                         idlen += sizeof (u_int64_t);
  792                 else
  793                         idlen += sizeof (u_int64_t) + 16; /* 16 random bytes */
  794                 MALLOC(newclp, struct nfsclclient *,
  795                     sizeof (struct nfsclclient) + idlen - 1, M_NFSCLCLIENT,
  796                     M_WAITOK | M_ZERO);
  797         }
  798         NFSLOCKCLSTATE();
  799         /*
  800          * If a forced dismount is already in progress, don't
  801          * allocate a new clientid and get out now. For the case where
  802          * clp != NULL, this is a harmless optimization.
  803          */
  804         if ((mp->mnt_kern_flag & MNTK_UNMOUNTF) != 0) {
  805                 NFSUNLOCKCLSTATE();
  806                 if (newclp != NULL)
  807                         free(newclp, M_NFSCLCLIENT);
  808                 return (EBADF);
  809         }
  810         clp = nmp->nm_clp;
  811         if (clp == NULL) {
  812                 if (newclp == NULL) {
  813                         NFSUNLOCKCLSTATE();
  814                         return (EACCES);
  815                 }
  816                 clp = newclp;
  817                 clp->nfsc_idlen = idlen;
  818                 LIST_INIT(&clp->nfsc_owner);
  819                 TAILQ_INIT(&clp->nfsc_deleg);
  820                 TAILQ_INIT(&clp->nfsc_layout);
  821                 LIST_INIT(&clp->nfsc_devinfo);
  822                 for (i = 0; i < NFSCLDELEGHASHSIZE; i++)
  823                         LIST_INIT(&clp->nfsc_deleghash[i]);
  824                 for (i = 0; i < NFSCLLAYOUTHASHSIZE; i++)
  825                         LIST_INIT(&clp->nfsc_layouthash[i]);
  826                 clp->nfsc_flags = NFSCLFLAGS_INITED;
  827                 clp->nfsc_clientidrev = 1;
  828                 clp->nfsc_cbident = nfscl_nextcbident();
  829                 nfscl_fillclid(nmp->nm_clval, uuid, clp->nfsc_id,
  830                     clp->nfsc_idlen);
  831                 LIST_INSERT_HEAD(&nfsclhead, clp, nfsc_list);
  832                 nmp->nm_clp = clp;
  833                 clp->nfsc_nmp = nmp;
  834                 NFSUNLOCKCLSTATE();
  835                 if (start_renewthread != 0)
  836                         nfscl_start_renewthread(clp);
  837         } else {
  838                 NFSUNLOCKCLSTATE();
  839                 if (newclp != NULL)
  840                         free(newclp, M_NFSCLCLIENT);
  841         }
  842         NFSLOCKCLSTATE();
  843         while ((clp->nfsc_flags & NFSCLFLAGS_HASCLIENTID) == 0 && !igotlock &&
  844             (mp->mnt_kern_flag & MNTK_UNMOUNTF) == 0)
  845                 igotlock = nfsv4_lock(&clp->nfsc_lock, 1, NULL,
  846                     NFSCLSTATEMUTEXPTR, mp);
  847         if (igotlock == 0) {
  848                 /*
  849                  * Call nfsv4_lock() with "iwantlock == 0" so that it will
  850                  * wait for a pending exclusive lock request.  This gives the
  851                  * exclusive lock request priority over this shared lock
  852                  * request.
  853                  * An exclusive lock on nfsc_lock is used mainly for server
  854                  * crash recoveries.
  855                  */
  856                 nfsv4_lock(&clp->nfsc_lock, 0, NULL, NFSCLSTATEMUTEXPTR, mp);
  857                 nfsv4_getref(&clp->nfsc_lock, NULL, NFSCLSTATEMUTEXPTR, mp);
  858         }
  859         if (igotlock == 0 && (mp->mnt_kern_flag & MNTK_UNMOUNTF) != 0) {
  860                 /*
  861                  * Both nfsv4_lock() and nfsv4_getref() know to check
  862                  * for MNTK_UNMOUNTF and return without sleeping to
  863                  * wait for the exclusive lock to be released, since it
  864                  * might be held by nfscl_umount() and we need to get out
  865                  * now for that case and not wait until nfscl_umount()
  866                  * releases it.
  867                  */
  868                 NFSUNLOCKCLSTATE();
  869                 return (EBADF);
  870         }
  871         NFSUNLOCKCLSTATE();
  872 
  873         /*
  874          * If it needs a clientid, do the setclientid now.
  875          */
  876         if ((clp->nfsc_flags & NFSCLFLAGS_HASCLIENTID) == 0) {
  877                 if (!igotlock)
  878                         panic("nfscl_clget");
  879                 if (p == NULL || cred == NULL) {
  880                         NFSLOCKCLSTATE();
  881                         nfsv4_unlock(&clp->nfsc_lock, 0);
  882                         NFSUNLOCKCLSTATE();
  883                         return (EACCES);
  884                 }
  885                 /*
  886                  * If RFC3530 Sec. 14.2.33 is taken literally,
  887                  * NFSERR_CLIDINUSE will be returned persistently for the
  888                  * case where a new mount of the same file system is using
  889                  * a different principal. In practice, NFSERR_CLIDINUSE is
  890                  * only returned when there is outstanding unexpired state
  891                  * on the clientid. As such, try for twice the lease
  892                  * interval, if we know what that is. Otherwise, make a
  893                  * wild ass guess.
  894                  * The case of returning NFSERR_STALECLIENTID is far less
  895                  * likely, but might occur if there is a significant delay
  896                  * between doing the SetClientID and SetClientIDConfirm Ops,
  897                  * such that the server throws away the clientid before
  898                  * receiving the SetClientIDConfirm.
  899                  */
  900                 if (clp->nfsc_renew > 0)
  901                         clidinusedelay = NFSCL_LEASE(clp->nfsc_renew) * 2;
  902                 else
  903                         clidinusedelay = 120;
  904                 trystalecnt = 3;
  905                 do {
  906                         error = nfsrpc_setclient(nmp, clp, 0, cred, p);
  907                         if (error == NFSERR_STALECLIENTID ||
  908                             error == NFSERR_STALEDONTRECOVER ||
  909                             error == NFSERR_BADSESSION ||
  910                             error == NFSERR_CLIDINUSE) {
  911                                 (void) nfs_catnap(PZERO, error, "nfs_setcl");
  912                         }
  913                 } while (((error == NFSERR_STALECLIENTID ||
  914                      error == NFSERR_BADSESSION ||
  915                      error == NFSERR_STALEDONTRECOVER) && --trystalecnt > 0) ||
  916                     (error == NFSERR_CLIDINUSE && --clidinusedelay > 0));
  917                 if (error) {
  918                         NFSLOCKCLSTATE();
  919                         nfsv4_unlock(&clp->nfsc_lock, 0);
  920                         NFSUNLOCKCLSTATE();
  921                         return (error);
  922                 }
  923                 clp->nfsc_flags |= NFSCLFLAGS_HASCLIENTID;
  924         }
  925         if (igotlock) {
  926                 NFSLOCKCLSTATE();
  927                 nfsv4_unlock(&clp->nfsc_lock, 1);
  928                 NFSUNLOCKCLSTATE();
  929         }
  930 
  931         *clpp = clp;
  932         return (0);
  933 }
  934 
  935 /*
  936  * Get a reference to a clientid and return it, if valid.
  937  */
  938 APPLESTATIC struct nfsclclient *
  939 nfscl_findcl(struct nfsmount *nmp)
  940 {
  941         struct nfsclclient *clp;
  942 
  943         clp = nmp->nm_clp;
  944         if (clp == NULL || !(clp->nfsc_flags & NFSCLFLAGS_HASCLIENTID))
  945                 return (NULL);
  946         return (clp);
  947 }
  948 
  949 /*
  950  * Release the clientid structure. It may be locked or reference counted.
  951  */
  952 static void
  953 nfscl_clrelease(struct nfsclclient *clp)
  954 {
  955 
  956         if (clp->nfsc_lock.nfslock_lock & NFSV4LOCK_LOCK)
  957                 nfsv4_unlock(&clp->nfsc_lock, 0);
  958         else
  959                 nfsv4_relref(&clp->nfsc_lock);
  960 }
  961 
  962 /*
  963  * External call for nfscl_clrelease.
  964  */
  965 APPLESTATIC void
  966 nfscl_clientrelease(struct nfsclclient *clp)
  967 {
  968 
  969         NFSLOCKCLSTATE();
  970         if (clp->nfsc_lock.nfslock_lock & NFSV4LOCK_LOCK)
  971                 nfsv4_unlock(&clp->nfsc_lock, 0);
  972         else
  973                 nfsv4_relref(&clp->nfsc_lock);
  974         NFSUNLOCKCLSTATE();
  975 }
  976 
  977 /*
  978  * Called when wanting to lock a byte region.
  979  */
  980 APPLESTATIC int
  981 nfscl_getbytelock(vnode_t vp, u_int64_t off, u_int64_t len,
  982     short type, struct ucred *cred, NFSPROC_T *p, struct nfsclclient *rclp,
  983     int recovery, void *id, int flags, u_int8_t *rownp, u_int8_t *ropenownp,
  984     struct nfscllockowner **lpp, int *newonep, int *donelocallyp)
  985 {
  986         struct nfscllockowner *lp;
  987         struct nfsclopen *op;
  988         struct nfsclclient *clp;
  989         struct nfscllockowner *nlp;
  990         struct nfscllock *nlop, *otherlop;
  991         struct nfscldeleg *dp = NULL, *ldp = NULL;
  992         struct nfscllockownerhead *lhp = NULL;
  993         struct nfsnode *np;
  994         u_int8_t own[NFSV4CL_LOCKNAMELEN], *ownp, openown[NFSV4CL_LOCKNAMELEN];
  995         u_int8_t *openownp;
  996         int error = 0, ret, donelocally = 0;
  997         u_int32_t mode;
  998 
  999         /* For Lock Ops, the open mode doesn't matter, so use 0 to match any. */
 1000         mode = 0;
 1001         np = VTONFS(vp);
 1002         *lpp = NULL;
 1003         lp = NULL;
 1004         *newonep = 0;
 1005         *donelocallyp = 0;
 1006 
 1007         /*
 1008          * Might need these, so MALLOC them now, to
 1009          * avoid a tsleep() in MALLOC later.
 1010          */
 1011         MALLOC(nlp, struct nfscllockowner *,
 1012             sizeof (struct nfscllockowner), M_NFSCLLOCKOWNER, M_WAITOK);
 1013         MALLOC(otherlop, struct nfscllock *,
 1014             sizeof (struct nfscllock), M_NFSCLLOCK, M_WAITOK);
 1015         MALLOC(nlop, struct nfscllock *,
 1016             sizeof (struct nfscllock), M_NFSCLLOCK, M_WAITOK);
 1017         nlop->nfslo_type = type;
 1018         nlop->nfslo_first = off;
 1019         if (len == NFS64BITSSET) {
 1020                 nlop->nfslo_end = NFS64BITSSET;
 1021         } else {
 1022                 nlop->nfslo_end = off + len;
 1023                 if (nlop->nfslo_end <= nlop->nfslo_first)
 1024                         error = NFSERR_INVAL;
 1025         }
 1026 
 1027         if (!error) {
 1028                 if (recovery)
 1029                         clp = rclp;
 1030                 else
 1031                         error = nfscl_getcl(vnode_mount(vp), cred, p, 1, &clp);
 1032         }
 1033         if (error) {
 1034                 FREE((caddr_t)nlp, M_NFSCLLOCKOWNER);
 1035                 FREE((caddr_t)otherlop, M_NFSCLLOCK);
 1036                 FREE((caddr_t)nlop, M_NFSCLLOCK);
 1037                 return (error);
 1038         }
 1039 
 1040         op = NULL;
 1041         if (recovery) {
 1042                 ownp = rownp;
 1043                 openownp = ropenownp;
 1044         } else {
 1045                 nfscl_filllockowner(id, own, flags);
 1046                 ownp = own;
 1047                 if (NFSHASONEOPENOWN(VFSTONFS(vnode_mount(vp))))
 1048                         nfscl_filllockowner(NULL, openown, F_POSIX);
 1049                 else
 1050                         nfscl_filllockowner(p->td_proc, openown, F_POSIX);
 1051                 openownp = openown;
 1052         }
 1053         if (!recovery) {
 1054                 NFSLOCKCLSTATE();
 1055                 /*
 1056                  * First, search for a delegation. If one exists for this file,
 1057                  * the lock can be done locally against it, so long as there
 1058                  * isn't a local lock conflict.
 1059                  */
 1060                 ldp = dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh,
 1061                     np->n_fhp->nfh_len);
 1062                 /* Just sanity check for correct type of delegation */
 1063                 if (dp != NULL && ((dp->nfsdl_flags &
 1064                     (NFSCLDL_RECALL | NFSCLDL_DELEGRET)) != 0 ||
 1065                      (type == F_WRLCK &&
 1066                       (dp->nfsdl_flags & NFSCLDL_WRITE) == 0)))
 1067                         dp = NULL;
 1068         }
 1069         if (dp != NULL) {
 1070                 /* Now, find an open and maybe a lockowner. */
 1071                 ret = nfscl_getopen(&dp->nfsdl_owner, np->n_fhp->nfh_fh,
 1072                     np->n_fhp->nfh_len, openownp, ownp, mode, NULL, &op);
 1073                 if (ret)
 1074                         ret = nfscl_getopen(&clp->nfsc_owner,
 1075                             np->n_fhp->nfh_fh, np->n_fhp->nfh_len, openownp,
 1076                             ownp, mode, NULL, &op);
 1077                 if (!ret) {
 1078                         lhp = &dp->nfsdl_lock;
 1079                         TAILQ_REMOVE(&clp->nfsc_deleg, dp, nfsdl_list);
 1080                         TAILQ_INSERT_HEAD(&clp->nfsc_deleg, dp, nfsdl_list);
 1081                         dp->nfsdl_timestamp = NFSD_MONOSEC + 120;
 1082                         donelocally = 1;
 1083                 } else {
 1084                         dp = NULL;
 1085                 }
 1086         }
 1087         if (!donelocally) {
 1088                 /*
 1089                  * Get the related Open and maybe lockowner.
 1090                  */
 1091                 error = nfscl_getopen(&clp->nfsc_owner,
 1092                     np->n_fhp->nfh_fh, np->n_fhp->nfh_len, openownp,
 1093                     ownp, mode, &lp, &op);
 1094                 if (!error)
 1095                         lhp = &op->nfso_lock;
 1096         }
 1097         if (!error && !recovery)
 1098                 error = nfscl_localconflict(clp, np->n_fhp->nfh_fh,
 1099                     np->n_fhp->nfh_len, nlop, ownp, ldp, NULL);
 1100         if (error) {
 1101                 if (!recovery) {
 1102                         nfscl_clrelease(clp);
 1103                         NFSUNLOCKCLSTATE();
 1104                 }
 1105                 FREE((caddr_t)nlp, M_NFSCLLOCKOWNER);
 1106                 FREE((caddr_t)otherlop, M_NFSCLLOCK);
 1107                 FREE((caddr_t)nlop, M_NFSCLLOCK);
 1108                 return (error);
 1109         }
 1110 
 1111         /*
 1112          * Ok, see if a lockowner exists and create one, as required.
 1113          */
 1114         if (lp == NULL)
 1115                 LIST_FOREACH(lp, lhp, nfsl_list) {
 1116                         if (!NFSBCMP(lp->nfsl_owner, ownp, NFSV4CL_LOCKNAMELEN))
 1117                                 break;
 1118                 }
 1119         if (lp == NULL) {
 1120                 NFSBCOPY(ownp, nlp->nfsl_owner, NFSV4CL_LOCKNAMELEN);
 1121                 if (recovery)
 1122                         NFSBCOPY(ropenownp, nlp->nfsl_openowner,
 1123                             NFSV4CL_LOCKNAMELEN);
 1124                 else
 1125                         NFSBCOPY(op->nfso_own->nfsow_owner, nlp->nfsl_openowner,
 1126                             NFSV4CL_LOCKNAMELEN);
 1127                 nlp->nfsl_seqid = 0;
 1128                 nlp->nfsl_lockflags = flags;
 1129                 nlp->nfsl_inprog = NULL;
 1130                 nfscl_lockinit(&nlp->nfsl_rwlock);
 1131                 LIST_INIT(&nlp->nfsl_lock);
 1132                 if (donelocally) {
 1133                         nlp->nfsl_open = NULL;
 1134                         nfsstatsv1.cllocallockowners++;
 1135                 } else {
 1136                         nlp->nfsl_open = op;
 1137                         nfsstatsv1.cllockowners++;
 1138                 }
 1139                 LIST_INSERT_HEAD(lhp, nlp, nfsl_list);
 1140                 lp = nlp;
 1141                 nlp = NULL;
 1142                 *newonep = 1;
 1143         }
 1144 
 1145         /*
 1146          * Now, update the byte ranges for locks.
 1147          */
 1148         ret = nfscl_updatelock(lp, &nlop, &otherlop, donelocally);
 1149         if (!ret)
 1150                 donelocally = 1;
 1151         if (donelocally) {
 1152                 *donelocallyp = 1;
 1153                 if (!recovery)
 1154                         nfscl_clrelease(clp);
 1155         } else {
 1156                 /*
 1157                  * Serial modifications on the lock owner for multiple threads
 1158                  * for the same process using a read/write lock.
 1159                  */
 1160                 if (!recovery)
 1161                         nfscl_lockexcl(&lp->nfsl_rwlock, NFSCLSTATEMUTEXPTR);
 1162         }
 1163         if (!recovery)
 1164                 NFSUNLOCKCLSTATE();
 1165 
 1166         if (nlp)
 1167                 FREE((caddr_t)nlp, M_NFSCLLOCKOWNER);
 1168         if (nlop)
 1169                 FREE((caddr_t)nlop, M_NFSCLLOCK);
 1170         if (otherlop)
 1171                 FREE((caddr_t)otherlop, M_NFSCLLOCK);
 1172 
 1173         *lpp = lp;
 1174         return (0);
 1175 }
 1176 
 1177 /*
 1178  * Called to unlock a byte range, for LockU.
 1179  */
 1180 APPLESTATIC int
 1181 nfscl_relbytelock(vnode_t vp, u_int64_t off, u_int64_t len,
 1182     __unused struct ucred *cred, NFSPROC_T *p, int callcnt,
 1183     struct nfsclclient *clp, void *id, int flags,
 1184     struct nfscllockowner **lpp, int *dorpcp)
 1185 {
 1186         struct nfscllockowner *lp;
 1187         struct nfsclowner *owp;
 1188         struct nfsclopen *op;
 1189         struct nfscllock *nlop, *other_lop = NULL;
 1190         struct nfscldeleg *dp;
 1191         struct nfsnode *np;
 1192         u_int8_t own[NFSV4CL_LOCKNAMELEN];
 1193         int ret = 0, fnd;
 1194 
 1195         np = VTONFS(vp);
 1196         *lpp = NULL;
 1197         *dorpcp = 0;
 1198 
 1199         /*
 1200          * Might need these, so MALLOC them now, to
 1201          * avoid a tsleep() in MALLOC later.
 1202          */
 1203         MALLOC(nlop, struct nfscllock *,
 1204             sizeof (struct nfscllock), M_NFSCLLOCK, M_WAITOK);
 1205         nlop->nfslo_type = F_UNLCK;
 1206         nlop->nfslo_first = off;
 1207         if (len == NFS64BITSSET) {
 1208                 nlop->nfslo_end = NFS64BITSSET;
 1209         } else {
 1210                 nlop->nfslo_end = off + len;
 1211                 if (nlop->nfslo_end <= nlop->nfslo_first) {
 1212                         FREE((caddr_t)nlop, M_NFSCLLOCK);
 1213                         return (NFSERR_INVAL);
 1214                 }
 1215         }
 1216         if (callcnt == 0) {
 1217                 MALLOC(other_lop, struct nfscllock *,
 1218                     sizeof (struct nfscllock), M_NFSCLLOCK, M_WAITOK);
 1219                 *other_lop = *nlop;
 1220         }
 1221         nfscl_filllockowner(id, own, flags);
 1222         dp = NULL;
 1223         NFSLOCKCLSTATE();
 1224         if (callcnt == 0)
 1225                 dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh,
 1226                     np->n_fhp->nfh_len);
 1227 
 1228         /*
 1229          * First, unlock any local regions on a delegation.
 1230          */
 1231         if (dp != NULL) {
 1232                 /* Look for this lockowner. */
 1233                 LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
 1234                         if (!NFSBCMP(lp->nfsl_owner, own,
 1235                             NFSV4CL_LOCKNAMELEN))
 1236                                 break;
 1237                 }
 1238                 if (lp != NULL)
 1239                         /* Use other_lop, so nlop is still available */
 1240                         (void)nfscl_updatelock(lp, &other_lop, NULL, 1);
 1241         }
 1242 
 1243         /*
 1244          * Now, find a matching open/lockowner that hasn't already been done,
 1245          * as marked by nfsl_inprog.
 1246          */
 1247         lp = NULL;
 1248         fnd = 0;
 1249         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 1250             LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 1251                 if (op->nfso_fhlen == np->n_fhp->nfh_len &&
 1252                     !NFSBCMP(op->nfso_fh, np->n_fhp->nfh_fh, op->nfso_fhlen)) {
 1253                     LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
 1254                         if (lp->nfsl_inprog == NULL &&
 1255                             !NFSBCMP(lp->nfsl_owner, own,
 1256                              NFSV4CL_LOCKNAMELEN)) {
 1257                                 fnd = 1;
 1258                                 break;
 1259                         }
 1260                     }
 1261                     if (fnd)
 1262                         break;
 1263                 }
 1264             }
 1265             if (fnd)
 1266                 break;
 1267         }
 1268 
 1269         if (lp != NULL) {
 1270                 ret = nfscl_updatelock(lp, &nlop, NULL, 0);
 1271                 if (ret)
 1272                         *dorpcp = 1;
 1273                 /*
 1274                  * Serial modifications on the lock owner for multiple
 1275                  * threads for the same process using a read/write lock.
 1276                  */
 1277                 lp->nfsl_inprog = p;
 1278                 nfscl_lockexcl(&lp->nfsl_rwlock, NFSCLSTATEMUTEXPTR);
 1279                 *lpp = lp;
 1280         }
 1281         NFSUNLOCKCLSTATE();
 1282         if (nlop)
 1283                 FREE((caddr_t)nlop, M_NFSCLLOCK);
 1284         if (other_lop)
 1285                 FREE((caddr_t)other_lop, M_NFSCLLOCK);
 1286         return (0);
 1287 }
 1288 
 1289 /*
 1290  * Release all lockowners marked in progess for this process and file.
 1291  */
 1292 APPLESTATIC void
 1293 nfscl_releasealllocks(struct nfsclclient *clp, vnode_t vp, NFSPROC_T *p,
 1294     void *id, int flags)
 1295 {
 1296         struct nfsclowner *owp;
 1297         struct nfsclopen *op;
 1298         struct nfscllockowner *lp;
 1299         struct nfsnode *np;
 1300         u_int8_t own[NFSV4CL_LOCKNAMELEN];
 1301 
 1302         np = VTONFS(vp);
 1303         nfscl_filllockowner(id, own, flags);
 1304         NFSLOCKCLSTATE();
 1305         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 1306             LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 1307                 if (op->nfso_fhlen == np->n_fhp->nfh_len &&
 1308                     !NFSBCMP(op->nfso_fh, np->n_fhp->nfh_fh, op->nfso_fhlen)) {
 1309                     LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
 1310                         if (lp->nfsl_inprog == p &&
 1311                             !NFSBCMP(lp->nfsl_owner, own,
 1312                             NFSV4CL_LOCKNAMELEN)) {
 1313                             lp->nfsl_inprog = NULL;
 1314                             nfscl_lockunlock(&lp->nfsl_rwlock);
 1315                         }
 1316                     }
 1317                 }
 1318             }
 1319         }
 1320         nfscl_clrelease(clp);
 1321         NFSUNLOCKCLSTATE();
 1322 }
 1323 
 1324 /*
 1325  * Called to find out if any bytes within the byte range specified are
 1326  * write locked by the calling process. Used to determine if flushing
 1327  * is required before a LockU.
 1328  * If in doubt, return 1, so the flush will occur.
 1329  */
 1330 APPLESTATIC int
 1331 nfscl_checkwritelocked(vnode_t vp, struct flock *fl,
 1332     struct ucred *cred, NFSPROC_T *p, void *id, int flags)
 1333 {
 1334         struct nfsclowner *owp;
 1335         struct nfscllockowner *lp;
 1336         struct nfsclopen *op;
 1337         struct nfsclclient *clp;
 1338         struct nfscllock *lop;
 1339         struct nfscldeleg *dp;
 1340         struct nfsnode *np;
 1341         u_int64_t off, end;
 1342         u_int8_t own[NFSV4CL_LOCKNAMELEN];
 1343         int error = 0;
 1344 
 1345         np = VTONFS(vp);
 1346         switch (fl->l_whence) {
 1347         case SEEK_SET:
 1348         case SEEK_CUR:
 1349                 /*
 1350                  * Caller is responsible for adding any necessary offset
 1351                  * when SEEK_CUR is used.
 1352                  */
 1353                 off = fl->l_start;
 1354                 break;
 1355         case SEEK_END:
 1356                 off = np->n_size + fl->l_start;
 1357                 break;
 1358         default:
 1359                 return (1);
 1360         }
 1361         if (fl->l_len != 0) {
 1362                 end = off + fl->l_len;
 1363                 if (end < off)
 1364                         return (1);
 1365         } else {
 1366                 end = NFS64BITSSET;
 1367         }
 1368 
 1369         error = nfscl_getcl(vnode_mount(vp), cred, p, 1, &clp);
 1370         if (error)
 1371                 return (1);
 1372         nfscl_filllockowner(id, own, flags);
 1373         NFSLOCKCLSTATE();
 1374 
 1375         /*
 1376          * First check the delegation locks.
 1377          */
 1378         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 1379         if (dp != NULL) {
 1380                 LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
 1381                         if (!NFSBCMP(lp->nfsl_owner, own,
 1382                             NFSV4CL_LOCKNAMELEN))
 1383                                 break;
 1384                 }
 1385                 if (lp != NULL) {
 1386                         LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
 1387                                 if (lop->nfslo_first >= end)
 1388                                         break;
 1389                                 if (lop->nfslo_end <= off)
 1390                                         continue;
 1391                                 if (lop->nfslo_type == F_WRLCK) {
 1392                                         nfscl_clrelease(clp);
 1393                                         NFSUNLOCKCLSTATE();
 1394                                         return (1);
 1395                                 }
 1396                         }
 1397                 }
 1398         }
 1399 
 1400         /*
 1401          * Now, check state against the server.
 1402          */
 1403         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 1404             LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 1405                 if (op->nfso_fhlen == np->n_fhp->nfh_len &&
 1406                     !NFSBCMP(op->nfso_fh, np->n_fhp->nfh_fh, op->nfso_fhlen)) {
 1407                     LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
 1408                         if (!NFSBCMP(lp->nfsl_owner, own,
 1409                             NFSV4CL_LOCKNAMELEN))
 1410                             break;
 1411                     }
 1412                     if (lp != NULL) {
 1413                         LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
 1414                             if (lop->nfslo_first >= end)
 1415                                 break;
 1416                             if (lop->nfslo_end <= off)
 1417                                 continue;
 1418                             if (lop->nfslo_type == F_WRLCK) {
 1419                                 nfscl_clrelease(clp);
 1420                                 NFSUNLOCKCLSTATE();
 1421                                 return (1);
 1422                             }
 1423                         }
 1424                     }
 1425                 }
 1426             }
 1427         }
 1428         nfscl_clrelease(clp);
 1429         NFSUNLOCKCLSTATE();
 1430         return (0);
 1431 }
 1432 
 1433 /*
 1434  * Release a byte range lock owner structure.
 1435  */
 1436 APPLESTATIC void
 1437 nfscl_lockrelease(struct nfscllockowner *lp, int error, int candelete)
 1438 {
 1439         struct nfsclclient *clp;
 1440 
 1441         if (lp == NULL)
 1442                 return;
 1443         NFSLOCKCLSTATE();
 1444         clp = lp->nfsl_open->nfso_own->nfsow_clp;
 1445         if (error != 0 && candelete &&
 1446             (lp->nfsl_rwlock.nfslock_lock & NFSV4LOCK_WANTED) == 0)
 1447                 nfscl_freelockowner(lp, 0);
 1448         else
 1449                 nfscl_lockunlock(&lp->nfsl_rwlock);
 1450         nfscl_clrelease(clp);
 1451         NFSUNLOCKCLSTATE();
 1452 }
 1453 
 1454 /*
 1455  * Free up an open structure and any associated byte range lock structures.
 1456  */
 1457 APPLESTATIC void
 1458 nfscl_freeopen(struct nfsclopen *op, int local)
 1459 {
 1460 
 1461         LIST_REMOVE(op, nfso_list);
 1462         nfscl_freealllocks(&op->nfso_lock, local);
 1463         FREE((caddr_t)op, M_NFSCLOPEN);
 1464         if (local)
 1465                 nfsstatsv1.cllocalopens--;
 1466         else
 1467                 nfsstatsv1.clopens--;
 1468 }
 1469 
 1470 /*
 1471  * Free up all lock owners and associated locks.
 1472  */
 1473 static void
 1474 nfscl_freealllocks(struct nfscllockownerhead *lhp, int local)
 1475 {
 1476         struct nfscllockowner *lp, *nlp;
 1477 
 1478         LIST_FOREACH_SAFE(lp, lhp, nfsl_list, nlp) {
 1479                 if ((lp->nfsl_rwlock.nfslock_lock & NFSV4LOCK_WANTED))
 1480                         panic("nfscllckw");
 1481                 nfscl_freelockowner(lp, local);
 1482         }
 1483 }
 1484 
 1485 /*
 1486  * Called for an Open when NFSERR_EXPIRED is received from the server.
 1487  * If there are no byte range locks nor a Share Deny lost, try to do a
 1488  * fresh Open. Otherwise, free the open.
 1489  */
 1490 static int
 1491 nfscl_expireopen(struct nfsclclient *clp, struct nfsclopen *op,
 1492     struct nfsmount *nmp, struct ucred *cred, NFSPROC_T *p)
 1493 {
 1494         struct nfscllockowner *lp;
 1495         struct nfscldeleg *dp;
 1496         int mustdelete = 0, error;
 1497 
 1498         /*
 1499          * Look for any byte range lock(s).
 1500          */
 1501         LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
 1502                 if (!LIST_EMPTY(&lp->nfsl_lock)) {
 1503                         mustdelete = 1;
 1504                         break;
 1505                 }
 1506         }
 1507 
 1508         /*
 1509          * If no byte range lock(s) nor a Share deny, try to re-open.
 1510          */
 1511         if (!mustdelete && (op->nfso_mode & NFSLCK_DENYBITS) == 0) {
 1512                 newnfs_copycred(&op->nfso_cred, cred);
 1513                 dp = NULL;
 1514                 error = nfsrpc_reopen(nmp, op->nfso_fh,
 1515                     op->nfso_fhlen, op->nfso_mode, op, &dp, cred, p);
 1516                 if (error) {
 1517                         mustdelete = 1;
 1518                         if (dp != NULL) {
 1519                                 FREE((caddr_t)dp, M_NFSCLDELEG);
 1520                                 dp = NULL;
 1521                         }
 1522                 }
 1523                 if (dp != NULL)
 1524                         nfscl_deleg(nmp->nm_mountp, clp, op->nfso_fh,
 1525                             op->nfso_fhlen, cred, p, &dp);
 1526         }
 1527 
 1528         /*
 1529          * If a byte range lock or Share deny or couldn't re-open, free it.
 1530          */
 1531         if (mustdelete)
 1532                 nfscl_freeopen(op, 0);
 1533         return (mustdelete);
 1534 }
 1535 
 1536 /*
 1537  * Free up an open owner structure.
 1538  */
 1539 static void
 1540 nfscl_freeopenowner(struct nfsclowner *owp, int local)
 1541 {
 1542 
 1543         LIST_REMOVE(owp, nfsow_list);
 1544         FREE((caddr_t)owp, M_NFSCLOWNER);
 1545         if (local)
 1546                 nfsstatsv1.cllocalopenowners--;
 1547         else
 1548                 nfsstatsv1.clopenowners--;
 1549 }
 1550 
 1551 /*
 1552  * Free up a byte range lock owner structure.
 1553  */
 1554 APPLESTATIC void
 1555 nfscl_freelockowner(struct nfscllockowner *lp, int local)
 1556 {
 1557         struct nfscllock *lop, *nlop;
 1558 
 1559         LIST_REMOVE(lp, nfsl_list);
 1560         LIST_FOREACH_SAFE(lop, &lp->nfsl_lock, nfslo_list, nlop) {
 1561                 nfscl_freelock(lop, local);
 1562         }
 1563         FREE((caddr_t)lp, M_NFSCLLOCKOWNER);
 1564         if (local)
 1565                 nfsstatsv1.cllocallockowners--;
 1566         else
 1567                 nfsstatsv1.cllockowners--;
 1568 }
 1569 
 1570 /*
 1571  * Free up a byte range lock structure.
 1572  */
 1573 APPLESTATIC void
 1574 nfscl_freelock(struct nfscllock *lop, int local)
 1575 {
 1576 
 1577         LIST_REMOVE(lop, nfslo_list);
 1578         FREE((caddr_t)lop, M_NFSCLLOCK);
 1579         if (local)
 1580                 nfsstatsv1.cllocallocks--;
 1581         else
 1582                 nfsstatsv1.cllocks--;
 1583 }
 1584 
 1585 /*
 1586  * Clean out the state related to a delegation.
 1587  */
 1588 static void
 1589 nfscl_cleandeleg(struct nfscldeleg *dp)
 1590 {
 1591         struct nfsclowner *owp, *nowp;
 1592         struct nfsclopen *op;
 1593 
 1594         LIST_FOREACH_SAFE(owp, &dp->nfsdl_owner, nfsow_list, nowp) {
 1595                 op = LIST_FIRST(&owp->nfsow_open);
 1596                 if (op != NULL) {
 1597                         if (LIST_NEXT(op, nfso_list) != NULL)
 1598                                 panic("nfscleandel");
 1599                         nfscl_freeopen(op, 1);
 1600                 }
 1601                 nfscl_freeopenowner(owp, 1);
 1602         }
 1603         nfscl_freealllocks(&dp->nfsdl_lock, 1);
 1604 }
 1605 
 1606 /*
 1607  * Free a delegation.
 1608  */
 1609 static void
 1610 nfscl_freedeleg(struct nfscldeleghead *hdp, struct nfscldeleg *dp)
 1611 {
 1612 
 1613         TAILQ_REMOVE(hdp, dp, nfsdl_list);
 1614         LIST_REMOVE(dp, nfsdl_hash);
 1615         FREE((caddr_t)dp, M_NFSCLDELEG);
 1616         nfsstatsv1.cldelegates--;
 1617         nfscl_delegcnt--;
 1618 }
 1619 
 1620 /*
 1621  * Free up all state related to this client structure.
 1622  */
 1623 static void
 1624 nfscl_cleanclient(struct nfsclclient *clp)
 1625 {
 1626         struct nfsclowner *owp, *nowp;
 1627         struct nfsclopen *op, *nop;
 1628 
 1629         /* Now, all the OpenOwners, etc. */
 1630         LIST_FOREACH_SAFE(owp, &clp->nfsc_owner, nfsow_list, nowp) {
 1631                 LIST_FOREACH_SAFE(op, &owp->nfsow_open, nfso_list, nop) {
 1632                         nfscl_freeopen(op, 0);
 1633                 }
 1634                 nfscl_freeopenowner(owp, 0);
 1635         }
 1636 }
 1637 
 1638 /*
 1639  * Called when an NFSERR_EXPIRED is received from the server.
 1640  */
 1641 static void
 1642 nfscl_expireclient(struct nfsclclient *clp, struct nfsmount *nmp,
 1643     struct ucred *cred, NFSPROC_T *p)
 1644 {
 1645         struct nfsclowner *owp, *nowp, *towp;
 1646         struct nfsclopen *op, *nop, *top;
 1647         struct nfscldeleg *dp, *ndp;
 1648         int ret, printed = 0;
 1649 
 1650         /*
 1651          * First, merge locally issued Opens into the list for the server.
 1652          */
 1653         dp = TAILQ_FIRST(&clp->nfsc_deleg);
 1654         while (dp != NULL) {
 1655             ndp = TAILQ_NEXT(dp, nfsdl_list);
 1656             owp = LIST_FIRST(&dp->nfsdl_owner);
 1657             while (owp != NULL) {
 1658                 nowp = LIST_NEXT(owp, nfsow_list);
 1659                 op = LIST_FIRST(&owp->nfsow_open);
 1660                 if (op != NULL) {
 1661                     if (LIST_NEXT(op, nfso_list) != NULL)
 1662                         panic("nfsclexp");
 1663                     LIST_FOREACH(towp, &clp->nfsc_owner, nfsow_list) {
 1664                         if (!NFSBCMP(towp->nfsow_owner, owp->nfsow_owner,
 1665                             NFSV4CL_LOCKNAMELEN))
 1666                             break;
 1667                     }
 1668                     if (towp != NULL) {
 1669                         /* Merge opens in */
 1670                         LIST_FOREACH(top, &towp->nfsow_open, nfso_list) {
 1671                             if (top->nfso_fhlen == op->nfso_fhlen &&
 1672                                 !NFSBCMP(top->nfso_fh, op->nfso_fh,
 1673                                  op->nfso_fhlen)) {
 1674                                 top->nfso_mode |= op->nfso_mode;
 1675                                 top->nfso_opencnt += op->nfso_opencnt;
 1676                                 break;
 1677                             }
 1678                         }
 1679                         if (top == NULL) {
 1680                             /* Just add the open to the owner list */
 1681                             LIST_REMOVE(op, nfso_list);
 1682                             op->nfso_own = towp;
 1683                             LIST_INSERT_HEAD(&towp->nfsow_open, op, nfso_list);
 1684                             nfsstatsv1.cllocalopens--;
 1685                             nfsstatsv1.clopens++;
 1686                         }
 1687                     } else {
 1688                         /* Just add the openowner to the client list */
 1689                         LIST_REMOVE(owp, nfsow_list);
 1690                         owp->nfsow_clp = clp;
 1691                         LIST_INSERT_HEAD(&clp->nfsc_owner, owp, nfsow_list);
 1692                         nfsstatsv1.cllocalopenowners--;
 1693                         nfsstatsv1.clopenowners++;
 1694                         nfsstatsv1.cllocalopens--;
 1695                         nfsstatsv1.clopens++;
 1696                     }
 1697                 }
 1698                 owp = nowp;
 1699             }
 1700             if (!printed && !LIST_EMPTY(&dp->nfsdl_lock)) {
 1701                 printed = 1;
 1702                 printf("nfsv4 expired locks lost\n");
 1703             }
 1704             nfscl_cleandeleg(dp);
 1705             nfscl_freedeleg(&clp->nfsc_deleg, dp);
 1706             dp = ndp;
 1707         }
 1708         if (!TAILQ_EMPTY(&clp->nfsc_deleg))
 1709             panic("nfsclexp");
 1710 
 1711         /*
 1712          * Now, try and reopen against the server.
 1713          */
 1714         LIST_FOREACH_SAFE(owp, &clp->nfsc_owner, nfsow_list, nowp) {
 1715                 owp->nfsow_seqid = 0;
 1716                 LIST_FOREACH_SAFE(op, &owp->nfsow_open, nfso_list, nop) {
 1717                         ret = nfscl_expireopen(clp, op, nmp, cred, p);
 1718                         if (ret && !printed) {
 1719                                 printed = 1;
 1720                                 printf("nfsv4 expired locks lost\n");
 1721                         }
 1722                 }
 1723                 if (LIST_EMPTY(&owp->nfsow_open))
 1724                         nfscl_freeopenowner(owp, 0);
 1725         }
 1726 }
 1727 
 1728 /*
 1729  * This function must be called after the process represented by "own" has
 1730  * exited. Must be called with CLSTATE lock held.
 1731  */
 1732 static void
 1733 nfscl_cleanup_common(struct nfsclclient *clp, u_int8_t *own)
 1734 {
 1735         struct nfsclowner *owp, *nowp;
 1736         struct nfscllockowner *lp, *nlp;
 1737         struct nfscldeleg *dp;
 1738 
 1739         /* First, get rid of local locks on delegations. */
 1740         TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
 1741                 LIST_FOREACH_SAFE(lp, &dp->nfsdl_lock, nfsl_list, nlp) {
 1742                     if (!NFSBCMP(lp->nfsl_owner, own, NFSV4CL_LOCKNAMELEN)) {
 1743                         if ((lp->nfsl_rwlock.nfslock_lock & NFSV4LOCK_WANTED))
 1744                             panic("nfscllckw");
 1745                         nfscl_freelockowner(lp, 1);
 1746                     }
 1747                 }
 1748         }
 1749         owp = LIST_FIRST(&clp->nfsc_owner);
 1750         while (owp != NULL) {
 1751                 nowp = LIST_NEXT(owp, nfsow_list);
 1752                 if (!NFSBCMP(owp->nfsow_owner, own,
 1753                     NFSV4CL_LOCKNAMELEN)) {
 1754                         /*
 1755                          * If there are children that haven't closed the
 1756                          * file descriptors yet, the opens will still be
 1757                          * here. For that case, let the renew thread clear
 1758                          * out the OpenOwner later.
 1759                          */
 1760                         if (LIST_EMPTY(&owp->nfsow_open))
 1761                                 nfscl_freeopenowner(owp, 0);
 1762                         else
 1763                                 owp->nfsow_defunct = 1;
 1764                 }
 1765                 owp = nowp;
 1766         }
 1767 }
 1768 
 1769 /*
 1770  * Find open/lock owners for processes that have exited.
 1771  */
 1772 static void
 1773 nfscl_cleanupkext(struct nfsclclient *clp, struct nfscllockownerfhhead *lhp)
 1774 {
 1775         struct nfsclowner *owp, *nowp;
 1776         struct nfsclopen *op;
 1777         struct nfscllockowner *lp, *nlp;
 1778         struct nfscldeleg *dp;
 1779 
 1780         NFSPROCLISTLOCK();
 1781         NFSLOCKCLSTATE();
 1782         LIST_FOREACH_SAFE(owp, &clp->nfsc_owner, nfsow_list, nowp) {
 1783                 LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 1784                         LIST_FOREACH_SAFE(lp, &op->nfso_lock, nfsl_list, nlp) {
 1785                                 if (LIST_EMPTY(&lp->nfsl_lock))
 1786                                         nfscl_emptylockowner(lp, lhp);
 1787                         }
 1788                 }
 1789                 if (nfscl_procdoesntexist(owp->nfsow_owner))
 1790                         nfscl_cleanup_common(clp, owp->nfsow_owner);
 1791         }
 1792 
 1793         /*
 1794          * For the single open_owner case, these lock owners need to be
 1795          * checked to see if they still exist separately.
 1796          * This is because nfscl_procdoesntexist() never returns true for
 1797          * the single open_owner so that the above doesn't ever call
 1798          * nfscl_cleanup_common().
 1799          */
 1800         TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
 1801                 LIST_FOREACH_SAFE(lp, &dp->nfsdl_lock, nfsl_list, nlp) {
 1802                         if (nfscl_procdoesntexist(lp->nfsl_owner))
 1803                                 nfscl_cleanup_common(clp, lp->nfsl_owner);
 1804                 }
 1805         }
 1806         NFSUNLOCKCLSTATE();
 1807         NFSPROCLISTUNLOCK();
 1808 }
 1809 
 1810 /*
 1811  * Take the empty lock owner and move it to the local lhp list if the
 1812  * associated process no longer exists.
 1813  */
 1814 static void
 1815 nfscl_emptylockowner(struct nfscllockowner *lp,
 1816     struct nfscllockownerfhhead *lhp)
 1817 {
 1818         struct nfscllockownerfh *lfhp, *mylfhp;
 1819         struct nfscllockowner *nlp;
 1820         int fnd_it;
 1821 
 1822         /* If not a Posix lock owner, just return. */
 1823         if ((lp->nfsl_lockflags & F_POSIX) == 0)
 1824                 return;
 1825 
 1826         fnd_it = 0;
 1827         mylfhp = NULL;
 1828         /*
 1829          * First, search to see if this lock owner is already in the list.
 1830          * If it is, then the associated process no longer exists.
 1831          */
 1832         SLIST_FOREACH(lfhp, lhp, nfslfh_list) {
 1833                 if (lfhp->nfslfh_len == lp->nfsl_open->nfso_fhlen &&
 1834                     !NFSBCMP(lfhp->nfslfh_fh, lp->nfsl_open->nfso_fh,
 1835                     lfhp->nfslfh_len))
 1836                         mylfhp = lfhp;
 1837                 LIST_FOREACH(nlp, &lfhp->nfslfh_lock, nfsl_list)
 1838                         if (!NFSBCMP(nlp->nfsl_owner, lp->nfsl_owner,
 1839                             NFSV4CL_LOCKNAMELEN))
 1840                                 fnd_it = 1;
 1841         }
 1842         /* If not found, check if process still exists. */
 1843         if (fnd_it == 0 && nfscl_procdoesntexist(lp->nfsl_owner) == 0)
 1844                 return;
 1845 
 1846         /* Move the lock owner over to the local list. */
 1847         if (mylfhp == NULL) {
 1848                 mylfhp = malloc(sizeof(struct nfscllockownerfh), M_TEMP,
 1849                     M_NOWAIT);
 1850                 if (mylfhp == NULL)
 1851                         return;
 1852                 mylfhp->nfslfh_len = lp->nfsl_open->nfso_fhlen;
 1853                 NFSBCOPY(lp->nfsl_open->nfso_fh, mylfhp->nfslfh_fh,
 1854                     mylfhp->nfslfh_len);
 1855                 LIST_INIT(&mylfhp->nfslfh_lock);
 1856                 SLIST_INSERT_HEAD(lhp, mylfhp, nfslfh_list);
 1857         }
 1858         LIST_REMOVE(lp, nfsl_list);
 1859         LIST_INSERT_HEAD(&mylfhp->nfslfh_lock, lp, nfsl_list);
 1860 }
 1861 
 1862 static int      fake_global;    /* Used to force visibility of MNTK_UNMOUNTF */
 1863 /*
 1864  * Called from nfs umount to free up the clientid.
 1865  */
 1866 APPLESTATIC void
 1867 nfscl_umount(struct nfsmount *nmp, NFSPROC_T *p)
 1868 {
 1869         struct nfsclclient *clp;
 1870         struct ucred *cred;
 1871         int igotlock;
 1872 
 1873         /*
 1874          * For the case that matters, this is the thread that set
 1875          * MNTK_UNMOUNTF, so it will see it set. The code that follows is
 1876          * done to ensure that any thread executing nfscl_getcl() after
 1877          * this time, will see MNTK_UNMOUNTF set. nfscl_getcl() uses the
 1878          * mutex for NFSLOCKCLSTATE(), so it is "m" for the following
 1879          * explanation, courtesy of Alan Cox.
 1880          * What follows is a snippet from Alan Cox's email at:
 1881          * http://docs.FreeBSD.org/cgi/
 1882          *     mid.cgi?BANLkTikR3d65zPHo9==08ZfJ2vmqZucEvw
 1883          * 
 1884          * 1. Set MNTK_UNMOUNTF
 1885          * 2. Acquire a standard FreeBSD mutex "m".
 1886          * 3. Update some data structures.
 1887          * 4. Release mutex "m".
 1888          * 
 1889          * Then, other threads that acquire "m" after step 4 has occurred will
 1890          * see MNTK_UNMOUNTF as set.  But, other threads that beat thread X to
 1891          * step 2 may or may not see MNTK_UNMOUNTF as set.
 1892          */
 1893         NFSLOCKCLSTATE();
 1894         if ((nmp->nm_mountp->mnt_kern_flag & MNTK_UNMOUNTF) != 0) {
 1895                 fake_global++;
 1896                 NFSUNLOCKCLSTATE();
 1897                 NFSLOCKCLSTATE();
 1898         }
 1899 
 1900         clp = nmp->nm_clp;
 1901         if (clp != NULL) {
 1902                 if ((clp->nfsc_flags & NFSCLFLAGS_INITED) == 0)
 1903                         panic("nfscl umount");
 1904         
 1905                 /*
 1906                  * First, handshake with the nfscl renew thread, to terminate
 1907                  * it.
 1908                  */
 1909                 clp->nfsc_flags |= NFSCLFLAGS_UMOUNT;
 1910                 while (clp->nfsc_flags & NFSCLFLAGS_HASTHREAD)
 1911                         (void)mtx_sleep(clp, NFSCLSTATEMUTEXPTR, PWAIT,
 1912                             "nfsclumnt", hz);
 1913         
 1914                 /*
 1915                  * Now, get the exclusive lock on the client state, so
 1916                  * that no uses of the state are still in progress.
 1917                  */
 1918                 do {
 1919                         igotlock = nfsv4_lock(&clp->nfsc_lock, 1, NULL,
 1920                             NFSCLSTATEMUTEXPTR, NULL);
 1921                 } while (!igotlock);
 1922                 NFSUNLOCKCLSTATE();
 1923         
 1924                 /*
 1925                  * Free up all the state. It will expire on the server, but
 1926                  * maybe we should do a SetClientId/SetClientIdConfirm so
 1927                  * the server throws it away?
 1928                  */
 1929                 LIST_REMOVE(clp, nfsc_list);
 1930                 nfscl_delegreturnall(clp, p);
 1931                 cred = newnfs_getcred();
 1932                 if (NFSHASNFSV4N(nmp)) {
 1933                         (void)nfsrpc_destroysession(nmp, clp, cred, p);
 1934                         (void)nfsrpc_destroyclient(nmp, clp, cred, p);
 1935                 } else
 1936                         (void)nfsrpc_setclient(nmp, clp, 0, cred, p);
 1937                 nfscl_cleanclient(clp);
 1938                 nmp->nm_clp = NULL;
 1939                 NFSFREECRED(cred);
 1940                 free(clp, M_NFSCLCLIENT);
 1941         } else
 1942                 NFSUNLOCKCLSTATE();
 1943 }
 1944 
 1945 /*
 1946  * This function is called when a server replies with NFSERR_STALECLIENTID
 1947  * NFSERR_STALESTATEID or NFSERR_BADSESSION. It traverses the clientid lists,
 1948  * doing Opens and Locks with reclaim. If these fail, it deletes the
 1949  * corresponding state.
 1950  */
 1951 static void
 1952 nfscl_recover(struct nfsclclient *clp, struct ucred *cred, NFSPROC_T *p)
 1953 {
 1954         struct nfsclowner *owp, *nowp;
 1955         struct nfsclopen *op, *nop;
 1956         struct nfscllockowner *lp, *nlp;
 1957         struct nfscllock *lop, *nlop;
 1958         struct nfscldeleg *dp, *ndp, *tdp;
 1959         struct nfsmount *nmp;
 1960         struct ucred *tcred;
 1961         struct nfsclopenhead extra_open;
 1962         struct nfscldeleghead extra_deleg;
 1963         struct nfsreq *rep;
 1964         u_int64_t len;
 1965         u_int32_t delegtype = NFSV4OPEN_DELEGATEWRITE, mode;
 1966         int i, igotlock = 0, error, trycnt, firstlock;
 1967         struct nfscllayout *lyp, *nlyp;
 1968 
 1969         /*
 1970          * First, lock the client structure, so everyone else will
 1971          * block when trying to use state.
 1972          */
 1973         NFSLOCKCLSTATE();
 1974         clp->nfsc_flags |= NFSCLFLAGS_RECVRINPROG;
 1975         do {
 1976                 igotlock = nfsv4_lock(&clp->nfsc_lock, 1, NULL,
 1977                     NFSCLSTATEMUTEXPTR, NULL);
 1978         } while (!igotlock);
 1979         NFSUNLOCKCLSTATE();
 1980 
 1981         nmp = clp->nfsc_nmp;
 1982         if (nmp == NULL)
 1983                 panic("nfscl recover");
 1984 
 1985         /*
 1986          * For now, just get rid of all layouts. There may be a need
 1987          * to do LayoutCommit Ops with reclaim == true later.
 1988          */
 1989         TAILQ_FOREACH_SAFE(lyp, &clp->nfsc_layout, nfsly_list, nlyp)
 1990                 nfscl_freelayout(lyp);
 1991         TAILQ_INIT(&clp->nfsc_layout);
 1992         for (i = 0; i < NFSCLLAYOUTHASHSIZE; i++)
 1993                 LIST_INIT(&clp->nfsc_layouthash[i]);
 1994 
 1995         trycnt = 5;
 1996         do {
 1997                 error = nfsrpc_setclient(nmp, clp, 1, cred, p);
 1998         } while ((error == NFSERR_STALECLIENTID ||
 1999              error == NFSERR_BADSESSION ||
 2000              error == NFSERR_STALEDONTRECOVER) && --trycnt > 0);
 2001         if (error) {
 2002                 NFSLOCKCLSTATE();
 2003                 clp->nfsc_flags &= ~(NFSCLFLAGS_RECOVER |
 2004                     NFSCLFLAGS_RECVRINPROG);
 2005                 wakeup(&clp->nfsc_flags);
 2006                 nfsv4_unlock(&clp->nfsc_lock, 0);
 2007                 NFSUNLOCKCLSTATE();
 2008                 return;
 2009         }
 2010         clp->nfsc_flags |= NFSCLFLAGS_HASCLIENTID;
 2011         clp->nfsc_flags &= ~NFSCLFLAGS_RECOVER;
 2012 
 2013         /*
 2014          * Mark requests already queued on the server, so that they don't
 2015          * initiate another recovery cycle. Any requests already in the
 2016          * queue that handle state information will have the old stale
 2017          * clientid/stateid and will get a NFSERR_STALESTATEID,
 2018          * NFSERR_STALECLIENTID or NFSERR_BADSESSION reply from the server.
 2019          * This will be translated to NFSERR_STALEDONTRECOVER when
 2020          * R_DONTRECOVER is set.
 2021          */
 2022         NFSLOCKREQ();
 2023         TAILQ_FOREACH(rep, &nfsd_reqq, r_chain) {
 2024                 if (rep->r_nmp == nmp)
 2025                         rep->r_flags |= R_DONTRECOVER;
 2026         }
 2027         NFSUNLOCKREQ();
 2028 
 2029         /*
 2030          * Now, mark all delegations "need reclaim".
 2031          */
 2032         TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list)
 2033                 dp->nfsdl_flags |= NFSCLDL_NEEDRECLAIM;
 2034 
 2035         TAILQ_INIT(&extra_deleg);
 2036         LIST_INIT(&extra_open);
 2037         /*
 2038          * Now traverse the state lists, doing Open and Lock Reclaims.
 2039          */
 2040         tcred = newnfs_getcred();
 2041         owp = LIST_FIRST(&clp->nfsc_owner);
 2042         while (owp != NULL) {
 2043             nowp = LIST_NEXT(owp, nfsow_list);
 2044             owp->nfsow_seqid = 0;
 2045             op = LIST_FIRST(&owp->nfsow_open);
 2046             while (op != NULL) {
 2047                 nop = LIST_NEXT(op, nfso_list);
 2048                 if (error != NFSERR_NOGRACE && error != NFSERR_BADSESSION) {
 2049                     /* Search for a delegation to reclaim with the open */
 2050                     TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
 2051                         if (!(dp->nfsdl_flags & NFSCLDL_NEEDRECLAIM))
 2052                             continue;
 2053                         if ((dp->nfsdl_flags & NFSCLDL_WRITE)) {
 2054                             mode = NFSV4OPEN_ACCESSWRITE;
 2055                             delegtype = NFSV4OPEN_DELEGATEWRITE;
 2056                         } else {
 2057                             mode = NFSV4OPEN_ACCESSREAD;
 2058                             delegtype = NFSV4OPEN_DELEGATEREAD;
 2059                         }
 2060                         if ((op->nfso_mode & mode) == mode &&
 2061                             op->nfso_fhlen == dp->nfsdl_fhlen &&
 2062                             !NFSBCMP(op->nfso_fh, dp->nfsdl_fh, op->nfso_fhlen))
 2063                             break;
 2064                     }
 2065                     ndp = dp;
 2066                     if (dp == NULL)
 2067                         delegtype = NFSV4OPEN_DELEGATENONE;
 2068                     newnfs_copycred(&op->nfso_cred, tcred);
 2069                     error = nfscl_tryopen(nmp, NULL, op->nfso_fh,
 2070                         op->nfso_fhlen, op->nfso_fh, op->nfso_fhlen,
 2071                         op->nfso_mode, op, NULL, 0, &ndp, 1, delegtype,
 2072                         tcred, p);
 2073                     if (!error) {
 2074                         /* Handle any replied delegation */
 2075                         if (ndp != NULL && ((ndp->nfsdl_flags & NFSCLDL_WRITE)
 2076                             || NFSMNT_RDONLY(nmp->nm_mountp))) {
 2077                             if ((ndp->nfsdl_flags & NFSCLDL_WRITE))
 2078                                 mode = NFSV4OPEN_ACCESSWRITE;
 2079                             else
 2080                                 mode = NFSV4OPEN_ACCESSREAD;
 2081                             TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
 2082                                 if (!(dp->nfsdl_flags & NFSCLDL_NEEDRECLAIM))
 2083                                     continue;
 2084                                 if ((op->nfso_mode & mode) == mode &&
 2085                                     op->nfso_fhlen == dp->nfsdl_fhlen &&
 2086                                     !NFSBCMP(op->nfso_fh, dp->nfsdl_fh,
 2087                                     op->nfso_fhlen)) {
 2088                                     dp->nfsdl_stateid = ndp->nfsdl_stateid;
 2089                                     dp->nfsdl_sizelimit = ndp->nfsdl_sizelimit;
 2090                                     dp->nfsdl_ace = ndp->nfsdl_ace;
 2091                                     dp->nfsdl_change = ndp->nfsdl_change;
 2092                                     dp->nfsdl_flags &= ~NFSCLDL_NEEDRECLAIM;
 2093                                     if ((ndp->nfsdl_flags & NFSCLDL_RECALL))
 2094                                         dp->nfsdl_flags |= NFSCLDL_RECALL;
 2095                                     FREE((caddr_t)ndp, M_NFSCLDELEG);
 2096                                     ndp = NULL;
 2097                                     break;
 2098                                 }
 2099                             }
 2100                         }
 2101                         if (ndp != NULL)
 2102                             TAILQ_INSERT_HEAD(&extra_deleg, ndp, nfsdl_list);
 2103 
 2104                         /* and reclaim all byte range locks */
 2105                         lp = LIST_FIRST(&op->nfso_lock);
 2106                         while (lp != NULL) {
 2107                             nlp = LIST_NEXT(lp, nfsl_list);
 2108                             lp->nfsl_seqid = 0;
 2109                             firstlock = 1;
 2110                             lop = LIST_FIRST(&lp->nfsl_lock);
 2111                             while (lop != NULL) {
 2112                                 nlop = LIST_NEXT(lop, nfslo_list);
 2113                                 if (lop->nfslo_end == NFS64BITSSET)
 2114                                     len = NFS64BITSSET;
 2115                                 else
 2116                                     len = lop->nfslo_end - lop->nfslo_first;
 2117                                 error = nfscl_trylock(nmp, NULL,
 2118                                     op->nfso_fh, op->nfso_fhlen, lp,
 2119                                     firstlock, 1, lop->nfslo_first, len,
 2120                                     lop->nfslo_type, tcred, p);
 2121                                 if (error != 0)
 2122                                     nfscl_freelock(lop, 0);
 2123                                 else
 2124                                     firstlock = 0;
 2125                                 lop = nlop;
 2126                             }
 2127                             /* If no locks, but a lockowner, just delete it. */
 2128                             if (LIST_EMPTY(&lp->nfsl_lock))
 2129                                 nfscl_freelockowner(lp, 0);
 2130                             lp = nlp;
 2131                         }
 2132                     }
 2133                 }
 2134                 if (error != 0 && error != NFSERR_BADSESSION)
 2135                     nfscl_freeopen(op, 0);
 2136                 op = nop;
 2137             }
 2138             owp = nowp;
 2139         }
 2140 
 2141         /*
 2142          * Now, try and get any delegations not yet reclaimed by cobbling
 2143          * to-gether an appropriate open.
 2144          */
 2145         nowp = NULL;
 2146         dp = TAILQ_FIRST(&clp->nfsc_deleg);
 2147         while (dp != NULL) {
 2148             ndp = TAILQ_NEXT(dp, nfsdl_list);
 2149             if ((dp->nfsdl_flags & NFSCLDL_NEEDRECLAIM)) {
 2150                 if (nowp == NULL) {
 2151                     MALLOC(nowp, struct nfsclowner *,
 2152                         sizeof (struct nfsclowner), M_NFSCLOWNER, M_WAITOK);
 2153                     /*
 2154                      * Name must be as long an largest possible
 2155                      * NFSV4CL_LOCKNAMELEN. 12 for now.
 2156                      */
 2157                     NFSBCOPY("RECLAIMDELEG", nowp->nfsow_owner,
 2158                         NFSV4CL_LOCKNAMELEN);
 2159                     LIST_INIT(&nowp->nfsow_open);
 2160                     nowp->nfsow_clp = clp;
 2161                     nowp->nfsow_seqid = 0;
 2162                     nowp->nfsow_defunct = 0;
 2163                     nfscl_lockinit(&nowp->nfsow_rwlock);
 2164                 }
 2165                 nop = NULL;
 2166                 if (error != NFSERR_NOGRACE && error != NFSERR_BADSESSION) {
 2167                     MALLOC(nop, struct nfsclopen *, sizeof (struct nfsclopen) +
 2168                         dp->nfsdl_fhlen - 1, M_NFSCLOPEN, M_WAITOK);
 2169                     nop->nfso_own = nowp;
 2170                     if ((dp->nfsdl_flags & NFSCLDL_WRITE)) {
 2171                         nop->nfso_mode = NFSV4OPEN_ACCESSWRITE;
 2172                         delegtype = NFSV4OPEN_DELEGATEWRITE;
 2173                     } else {
 2174                         nop->nfso_mode = NFSV4OPEN_ACCESSREAD;
 2175                         delegtype = NFSV4OPEN_DELEGATEREAD;
 2176                     }
 2177                     nop->nfso_opencnt = 0;
 2178                     nop->nfso_posixlock = 1;
 2179                     nop->nfso_fhlen = dp->nfsdl_fhlen;
 2180                     NFSBCOPY(dp->nfsdl_fh, nop->nfso_fh, dp->nfsdl_fhlen);
 2181                     LIST_INIT(&nop->nfso_lock);
 2182                     nop->nfso_stateid.seqid = 0;
 2183                     nop->nfso_stateid.other[0] = 0;
 2184                     nop->nfso_stateid.other[1] = 0;
 2185                     nop->nfso_stateid.other[2] = 0;
 2186                     newnfs_copycred(&dp->nfsdl_cred, tcred);
 2187                     newnfs_copyincred(tcred, &nop->nfso_cred);
 2188                     tdp = NULL;
 2189                     error = nfscl_tryopen(nmp, NULL, nop->nfso_fh,
 2190                         nop->nfso_fhlen, nop->nfso_fh, nop->nfso_fhlen,
 2191                         nop->nfso_mode, nop, NULL, 0, &tdp, 1,
 2192                         delegtype, tcred, p);
 2193                     if (tdp != NULL) {
 2194                         if ((tdp->nfsdl_flags & NFSCLDL_WRITE))
 2195                             mode = NFSV4OPEN_ACCESSWRITE;
 2196                         else
 2197                             mode = NFSV4OPEN_ACCESSREAD;
 2198                         if ((nop->nfso_mode & mode) == mode &&
 2199                             nop->nfso_fhlen == tdp->nfsdl_fhlen &&
 2200                             !NFSBCMP(nop->nfso_fh, tdp->nfsdl_fh,
 2201                             nop->nfso_fhlen)) {
 2202                             dp->nfsdl_stateid = tdp->nfsdl_stateid;
 2203                             dp->nfsdl_sizelimit = tdp->nfsdl_sizelimit;
 2204                             dp->nfsdl_ace = tdp->nfsdl_ace;
 2205                             dp->nfsdl_change = tdp->nfsdl_change;
 2206                             dp->nfsdl_flags &= ~NFSCLDL_NEEDRECLAIM;
 2207                             if ((tdp->nfsdl_flags & NFSCLDL_RECALL))
 2208                                 dp->nfsdl_flags |= NFSCLDL_RECALL;
 2209                             FREE((caddr_t)tdp, M_NFSCLDELEG);
 2210                         } else {
 2211                             TAILQ_INSERT_HEAD(&extra_deleg, tdp, nfsdl_list);
 2212                         }
 2213                     }
 2214                 }
 2215                 if (error) {
 2216                     if (nop != NULL)
 2217                         FREE((caddr_t)nop, M_NFSCLOPEN);
 2218                     /*
 2219                      * Couldn't reclaim it, so throw the state
 2220                      * away. Ouch!!
 2221                      */
 2222                     nfscl_cleandeleg(dp);
 2223                     nfscl_freedeleg(&clp->nfsc_deleg, dp);
 2224                 } else {
 2225                     LIST_INSERT_HEAD(&extra_open, nop, nfso_list);
 2226                 }
 2227             }
 2228             dp = ndp;
 2229         }
 2230 
 2231         /*
 2232          * Now, get rid of extra Opens and Delegations.
 2233          */
 2234         LIST_FOREACH_SAFE(op, &extra_open, nfso_list, nop) {
 2235                 do {
 2236                         newnfs_copycred(&op->nfso_cred, tcred);
 2237                         error = nfscl_tryclose(op, tcred, nmp, p);
 2238                         if (error == NFSERR_GRACE)
 2239                                 (void) nfs_catnap(PZERO, error, "nfsexcls");
 2240                 } while (error == NFSERR_GRACE);
 2241                 LIST_REMOVE(op, nfso_list);
 2242                 FREE((caddr_t)op, M_NFSCLOPEN);
 2243         }
 2244         if (nowp != NULL)
 2245                 FREE((caddr_t)nowp, M_NFSCLOWNER);
 2246 
 2247         TAILQ_FOREACH_SAFE(dp, &extra_deleg, nfsdl_list, ndp) {
 2248                 do {
 2249                         newnfs_copycred(&dp->nfsdl_cred, tcred);
 2250                         error = nfscl_trydelegreturn(dp, tcred, nmp, p);
 2251                         if (error == NFSERR_GRACE)
 2252                                 (void) nfs_catnap(PZERO, error, "nfsexdlg");
 2253                 } while (error == NFSERR_GRACE);
 2254                 TAILQ_REMOVE(&extra_deleg, dp, nfsdl_list);
 2255                 FREE((caddr_t)dp, M_NFSCLDELEG);
 2256         }
 2257 
 2258         /* For NFSv4.1 or later, do a RECLAIM_COMPLETE. */
 2259         if (NFSHASNFSV4N(nmp))
 2260                 (void)nfsrpc_reclaimcomplete(nmp, cred, p);
 2261 
 2262         NFSLOCKCLSTATE();
 2263         clp->nfsc_flags &= ~NFSCLFLAGS_RECVRINPROG;
 2264         wakeup(&clp->nfsc_flags);
 2265         nfsv4_unlock(&clp->nfsc_lock, 0);
 2266         NFSUNLOCKCLSTATE();
 2267         NFSFREECRED(tcred);
 2268 }
 2269 
 2270 /*
 2271  * This function is called when a server replies with NFSERR_EXPIRED.
 2272  * It deletes all state for the client and does a fresh SetClientId/confirm.
 2273  * XXX Someday it should post a signal to the process(es) that hold the
 2274  * state, so they know that lock state has been lost.
 2275  */
 2276 APPLESTATIC int
 2277 nfscl_hasexpired(struct nfsclclient *clp, u_int32_t clidrev, NFSPROC_T *p)
 2278 {
 2279         struct nfsmount *nmp;
 2280         struct ucred *cred;
 2281         int igotlock = 0, error, trycnt;
 2282 
 2283         /*
 2284          * If the clientid has gone away or a new SetClientid has already
 2285          * been done, just return ok.
 2286          */
 2287         if (clp == NULL || clidrev != clp->nfsc_clientidrev)
 2288                 return (0);
 2289 
 2290         /*
 2291          * First, lock the client structure, so everyone else will
 2292          * block when trying to use state. Also, use NFSCLFLAGS_EXPIREIT so
 2293          * that only one thread does the work.
 2294          */
 2295         NFSLOCKCLSTATE();
 2296         clp->nfsc_flags |= NFSCLFLAGS_EXPIREIT;
 2297         do {
 2298                 igotlock = nfsv4_lock(&clp->nfsc_lock, 1, NULL,
 2299                     NFSCLSTATEMUTEXPTR, NULL);
 2300         } while (!igotlock && (clp->nfsc_flags & NFSCLFLAGS_EXPIREIT));
 2301         if ((clp->nfsc_flags & NFSCLFLAGS_EXPIREIT) == 0) {
 2302                 if (igotlock)
 2303                         nfsv4_unlock(&clp->nfsc_lock, 0);
 2304                 NFSUNLOCKCLSTATE();
 2305                 return (0);
 2306         }
 2307         clp->nfsc_flags |= NFSCLFLAGS_RECVRINPROG;
 2308         NFSUNLOCKCLSTATE();
 2309 
 2310         nmp = clp->nfsc_nmp;
 2311         if (nmp == NULL)
 2312                 panic("nfscl expired");
 2313         cred = newnfs_getcred();
 2314         trycnt = 5;
 2315         do {
 2316                 error = nfsrpc_setclient(nmp, clp, 0, cred, p);
 2317         } while ((error == NFSERR_STALECLIENTID ||
 2318              error == NFSERR_BADSESSION ||
 2319              error == NFSERR_STALEDONTRECOVER) && --trycnt > 0);
 2320         if (error) {
 2321                 NFSLOCKCLSTATE();
 2322                 clp->nfsc_flags &= ~NFSCLFLAGS_RECOVER;
 2323         } else {
 2324                 /*
 2325                  * Expire the state for the client.
 2326                  */
 2327                 nfscl_expireclient(clp, nmp, cred, p);
 2328                 NFSLOCKCLSTATE();
 2329                 clp->nfsc_flags |= NFSCLFLAGS_HASCLIENTID;
 2330                 clp->nfsc_flags &= ~NFSCLFLAGS_RECOVER;
 2331         }
 2332         clp->nfsc_flags &= ~(NFSCLFLAGS_EXPIREIT | NFSCLFLAGS_RECVRINPROG);
 2333         wakeup(&clp->nfsc_flags);
 2334         nfsv4_unlock(&clp->nfsc_lock, 0);
 2335         NFSUNLOCKCLSTATE();
 2336         NFSFREECRED(cred);
 2337         return (error);
 2338 }
 2339 
 2340 /*
 2341  * This function inserts a lock in the list after insert_lop.
 2342  */
 2343 static void
 2344 nfscl_insertlock(struct nfscllockowner *lp, struct nfscllock *new_lop,
 2345     struct nfscllock *insert_lop, int local)
 2346 {
 2347 
 2348         if ((struct nfscllockowner *)insert_lop == lp)
 2349                 LIST_INSERT_HEAD(&lp->nfsl_lock, new_lop, nfslo_list);
 2350         else
 2351                 LIST_INSERT_AFTER(insert_lop, new_lop, nfslo_list);
 2352         if (local)
 2353                 nfsstatsv1.cllocallocks++;
 2354         else
 2355                 nfsstatsv1.cllocks++;
 2356 }
 2357 
 2358 /*
 2359  * This function updates the locking for a lock owner and given file. It
 2360  * maintains a list of lock ranges ordered on increasing file offset that
 2361  * are NFSCLLOCK_READ or NFSCLLOCK_WRITE and non-overlapping (aka POSIX style).
 2362  * It always adds new_lop to the list and sometimes uses the one pointed
 2363  * at by other_lopp.
 2364  * Returns 1 if the locks were modified, 0 otherwise.
 2365  */
 2366 static int
 2367 nfscl_updatelock(struct nfscllockowner *lp, struct nfscllock **new_lopp,
 2368     struct nfscllock **other_lopp, int local)
 2369 {
 2370         struct nfscllock *new_lop = *new_lopp;
 2371         struct nfscllock *lop, *tlop, *ilop;
 2372         struct nfscllock *other_lop;
 2373         int unlock = 0, modified = 0;
 2374         u_int64_t tmp;
 2375 
 2376         /*
 2377          * Work down the list until the lock is merged.
 2378          */
 2379         if (new_lop->nfslo_type == F_UNLCK)
 2380                 unlock = 1;
 2381         ilop = (struct nfscllock *)lp;
 2382         lop = LIST_FIRST(&lp->nfsl_lock);
 2383         while (lop != NULL) {
 2384             /*
 2385              * Only check locks for this file that aren't before the start of
 2386              * new lock's range.
 2387              */
 2388             if (lop->nfslo_end >= new_lop->nfslo_first) {
 2389                 if (new_lop->nfslo_end < lop->nfslo_first) {
 2390                     /*
 2391                      * If the new lock ends before the start of the
 2392                      * current lock's range, no merge, just insert
 2393                      * the new lock.
 2394                      */
 2395                     break;
 2396                 }
 2397                 if (new_lop->nfslo_type == lop->nfslo_type ||
 2398                     (new_lop->nfslo_first <= lop->nfslo_first &&
 2399                      new_lop->nfslo_end >= lop->nfslo_end)) {
 2400                     /*
 2401                      * This lock can be absorbed by the new lock/unlock.
 2402                      * This happens when it covers the entire range
 2403                      * of the old lock or is contiguous
 2404                      * with the old lock and is of the same type or an
 2405                      * unlock.
 2406                      */
 2407                     if (new_lop->nfslo_type != lop->nfslo_type ||
 2408                         new_lop->nfslo_first != lop->nfslo_first ||
 2409                         new_lop->nfslo_end != lop->nfslo_end)
 2410                         modified = 1;
 2411                     if (lop->nfslo_first < new_lop->nfslo_first)
 2412                         new_lop->nfslo_first = lop->nfslo_first;
 2413                     if (lop->nfslo_end > new_lop->nfslo_end)
 2414                         new_lop->nfslo_end = lop->nfslo_end;
 2415                     tlop = lop;
 2416                     lop = LIST_NEXT(lop, nfslo_list);
 2417                     nfscl_freelock(tlop, local);
 2418                     continue;
 2419                 }
 2420 
 2421                 /*
 2422                  * All these cases are for contiguous locks that are not the
 2423                  * same type, so they can't be merged.
 2424                  */
 2425                 if (new_lop->nfslo_first <= lop->nfslo_first) {
 2426                     /*
 2427                      * This case is where the new lock overlaps with the
 2428                      * first part of the old lock. Move the start of the
 2429                      * old lock to just past the end of the new lock. The
 2430                      * new lock will be inserted in front of the old, since
 2431                      * ilop hasn't been updated. (We are done now.)
 2432                      */
 2433                     if (lop->nfslo_first != new_lop->nfslo_end) {
 2434                         lop->nfslo_first = new_lop->nfslo_end;
 2435                         modified = 1;
 2436                     }
 2437                     break;
 2438                 }
 2439                 if (new_lop->nfslo_end >= lop->nfslo_end) {
 2440                     /*
 2441                      * This case is where the new lock overlaps with the
 2442                      * end of the old lock's range. Move the old lock's
 2443                      * end to just before the new lock's first and insert
 2444                      * the new lock after the old lock.
 2445                      * Might not be done yet, since the new lock could
 2446                      * overlap further locks with higher ranges.
 2447                      */
 2448                     if (lop->nfslo_end != new_lop->nfslo_first) {
 2449                         lop->nfslo_end = new_lop->nfslo_first;
 2450                         modified = 1;
 2451                     }
 2452                     ilop = lop;
 2453                     lop = LIST_NEXT(lop, nfslo_list);
 2454                     continue;
 2455                 }
 2456                 /*
 2457                  * The final case is where the new lock's range is in the
 2458                  * middle of the current lock's and splits the current lock
 2459                  * up. Use *other_lopp to handle the second part of the
 2460                  * split old lock range. (We are done now.)
 2461                  * For unlock, we use new_lop as other_lop and tmp, since
 2462                  * other_lop and new_lop are the same for this case.
 2463                  * We noted the unlock case above, so we don't need
 2464                  * new_lop->nfslo_type any longer.
 2465                  */
 2466                 tmp = new_lop->nfslo_first;
 2467                 if (unlock) {
 2468                     other_lop = new_lop;
 2469                     *new_lopp = NULL;
 2470                 } else {
 2471                     other_lop = *other_lopp;
 2472                     *other_lopp = NULL;
 2473                 }
 2474                 other_lop->nfslo_first = new_lop->nfslo_end;
 2475                 other_lop->nfslo_end = lop->nfslo_end;
 2476                 other_lop->nfslo_type = lop->nfslo_type;
 2477                 lop->nfslo_end = tmp;
 2478                 nfscl_insertlock(lp, other_lop, lop, local);
 2479                 ilop = lop;
 2480                 modified = 1;
 2481                 break;
 2482             }
 2483             ilop = lop;
 2484             lop = LIST_NEXT(lop, nfslo_list);
 2485             if (lop == NULL)
 2486                 break;
 2487         }
 2488 
 2489         /*
 2490          * Insert the new lock in the list at the appropriate place.
 2491          */
 2492         if (!unlock) {
 2493                 nfscl_insertlock(lp, new_lop, ilop, local);
 2494                 *new_lopp = NULL;
 2495                 modified = 1;
 2496         }
 2497         return (modified);
 2498 }
 2499 
 2500 /*
 2501  * This function must be run as a kernel thread.
 2502  * It does Renew Ops and recovery, when required.
 2503  */
 2504 APPLESTATIC void
 2505 nfscl_renewthread(struct nfsclclient *clp, NFSPROC_T *p)
 2506 {
 2507         struct nfsclowner *owp, *nowp;
 2508         struct nfsclopen *op;
 2509         struct nfscllockowner *lp, *nlp;
 2510         struct nfscldeleghead dh;
 2511         struct nfscldeleg *dp, *ndp;
 2512         struct ucred *cred;
 2513         u_int32_t clidrev;
 2514         int error, cbpathdown, islept, igotlock, ret, clearok;
 2515         uint32_t recover_done_time = 0;
 2516         time_t mytime;
 2517         static time_t prevsec = 0;
 2518         struct nfscllockownerfh *lfhp, *nlfhp;
 2519         struct nfscllockownerfhhead lfh;
 2520         struct nfscllayout *lyp, *nlyp;
 2521         struct nfscldevinfo *dip, *ndip;
 2522         struct nfscllayouthead rlh;
 2523         struct nfsclrecalllayout *recallp;
 2524         struct nfsclds *dsp;
 2525 
 2526         cred = newnfs_getcred();
 2527         NFSLOCKCLSTATE();
 2528         clp->nfsc_flags |= NFSCLFLAGS_HASTHREAD;
 2529         NFSUNLOCKCLSTATE();
 2530         for(;;) {
 2531                 newnfs_setroot(cred);
 2532                 cbpathdown = 0;
 2533                 if (clp->nfsc_flags & NFSCLFLAGS_RECOVER) {
 2534                         /*
 2535                          * Only allow one recover within 1/2 of the lease
 2536                          * duration (nfsc_renew).
 2537                          */
 2538                         if (recover_done_time < NFSD_MONOSEC) {
 2539                                 recover_done_time = NFSD_MONOSEC +
 2540                                     clp->nfsc_renew;
 2541                                 NFSCL_DEBUG(1, "Doing recovery..\n");
 2542                                 nfscl_recover(clp, cred, p);
 2543                         } else {
 2544                                 NFSCL_DEBUG(1, "Clear Recovery dt=%u ms=%jd\n",
 2545                                     recover_done_time, (intmax_t)NFSD_MONOSEC);
 2546                                 NFSLOCKCLSTATE();
 2547                                 clp->nfsc_flags &= ~NFSCLFLAGS_RECOVER;
 2548                                 NFSUNLOCKCLSTATE();
 2549                         }
 2550                 }
 2551                 if (clp->nfsc_expire <= NFSD_MONOSEC &&
 2552                     (clp->nfsc_flags & NFSCLFLAGS_HASCLIENTID)) {
 2553                         clp->nfsc_expire = NFSD_MONOSEC + clp->nfsc_renew;
 2554                         clidrev = clp->nfsc_clientidrev;
 2555                         error = nfsrpc_renew(clp, NULL, cred, p);
 2556                         if (error == NFSERR_CBPATHDOWN)
 2557                             cbpathdown = 1;
 2558                         else if (error == NFSERR_STALECLIENTID ||
 2559                             error == NFSERR_BADSESSION) {
 2560                             NFSLOCKCLSTATE();
 2561                             clp->nfsc_flags |= NFSCLFLAGS_RECOVER;
 2562                             NFSUNLOCKCLSTATE();
 2563                         } else if (error == NFSERR_EXPIRED)
 2564                             (void) nfscl_hasexpired(clp, clidrev, p);
 2565                 }
 2566 
 2567 checkdsrenew:
 2568                 if (NFSHASNFSV4N(clp->nfsc_nmp)) {
 2569                         /* Do renews for any DS sessions. */
 2570                         NFSLOCKMNT(clp->nfsc_nmp);
 2571                         /* Skip first entry, since the MDS is handled above. */
 2572                         dsp = TAILQ_FIRST(&clp->nfsc_nmp->nm_sess);
 2573                         if (dsp != NULL)
 2574                                 dsp = TAILQ_NEXT(dsp, nfsclds_list);
 2575                         while (dsp != NULL) {
 2576                                 if (dsp->nfsclds_expire <= NFSD_MONOSEC &&
 2577                                     dsp->nfsclds_sess.nfsess_defunct == 0) {
 2578                                         dsp->nfsclds_expire = NFSD_MONOSEC +
 2579                                             clp->nfsc_renew;
 2580                                         NFSUNLOCKMNT(clp->nfsc_nmp);
 2581                                         (void)nfsrpc_renew(clp, dsp, cred, p);
 2582                                         goto checkdsrenew;
 2583                                 }
 2584                                 dsp = TAILQ_NEXT(dsp, nfsclds_list);
 2585                         }
 2586                         NFSUNLOCKMNT(clp->nfsc_nmp);
 2587                 }
 2588 
 2589                 TAILQ_INIT(&dh);
 2590                 NFSLOCKCLSTATE();
 2591                 if (cbpathdown)
 2592                         /* It's a Total Recall! */
 2593                         nfscl_totalrecall(clp);
 2594 
 2595                 /*
 2596                  * Now, handle defunct owners.
 2597                  */
 2598                 LIST_FOREACH_SAFE(owp, &clp->nfsc_owner, nfsow_list, nowp) {
 2599                         if (LIST_EMPTY(&owp->nfsow_open)) {
 2600                                 if (owp->nfsow_defunct != 0)
 2601                                         nfscl_freeopenowner(owp, 0);
 2602                         }
 2603                 }
 2604 
 2605                 /*
 2606                  * Do the recall on any delegations. To avoid trouble, always
 2607                  * come back up here after having slept.
 2608                  */
 2609                 igotlock = 0;
 2610 tryagain:
 2611                 dp = TAILQ_FIRST(&clp->nfsc_deleg);
 2612                 while (dp != NULL) {
 2613                         ndp = TAILQ_NEXT(dp, nfsdl_list);
 2614                         if ((dp->nfsdl_flags & NFSCLDL_RECALL)) {
 2615                                 /*
 2616                                  * Wait for outstanding I/O ops to be done.
 2617                                  */
 2618                                 if (dp->nfsdl_rwlock.nfslock_usecnt > 0) {
 2619                                     if (igotlock) {
 2620                                         nfsv4_unlock(&clp->nfsc_lock, 0);
 2621                                         igotlock = 0;
 2622                                     }
 2623                                     dp->nfsdl_rwlock.nfslock_lock |=
 2624                                         NFSV4LOCK_WANTED;
 2625                                     (void) nfsmsleep(&dp->nfsdl_rwlock,
 2626                                         NFSCLSTATEMUTEXPTR, PZERO, "nfscld",
 2627                                         NULL);
 2628                                     goto tryagain;
 2629                                 }
 2630                                 while (!igotlock) {
 2631                                     igotlock = nfsv4_lock(&clp->nfsc_lock, 1,
 2632                                         &islept, NFSCLSTATEMUTEXPTR, NULL);
 2633                                     if (islept)
 2634                                         goto tryagain;
 2635                                 }
 2636                                 NFSUNLOCKCLSTATE();
 2637                                 newnfs_copycred(&dp->nfsdl_cred, cred);
 2638                                 ret = nfscl_recalldeleg(clp, clp->nfsc_nmp, dp,
 2639                                     NULL, cred, p, 1);
 2640                                 if (!ret) {
 2641                                     nfscl_cleandeleg(dp);
 2642                                     TAILQ_REMOVE(&clp->nfsc_deleg, dp,
 2643                                         nfsdl_list);
 2644                                     LIST_REMOVE(dp, nfsdl_hash);
 2645                                     TAILQ_INSERT_HEAD(&dh, dp, nfsdl_list);
 2646                                     nfscl_delegcnt--;
 2647                                     nfsstatsv1.cldelegates--;
 2648                                 }
 2649                                 NFSLOCKCLSTATE();
 2650                         }
 2651                         dp = ndp;
 2652                 }
 2653 
 2654                 /*
 2655                  * Clear out old delegations, if we are above the high water
 2656                  * mark. Only clear out ones with no state related to them.
 2657                  * The tailq list is in LRU order.
 2658                  */
 2659                 dp = TAILQ_LAST(&clp->nfsc_deleg, nfscldeleghead);
 2660                 while (nfscl_delegcnt > nfscl_deleghighwater && dp != NULL) {
 2661                     ndp = TAILQ_PREV(dp, nfscldeleghead, nfsdl_list);
 2662                     if (dp->nfsdl_rwlock.nfslock_usecnt == 0 &&
 2663                         dp->nfsdl_rwlock.nfslock_lock == 0 &&
 2664                         dp->nfsdl_timestamp < NFSD_MONOSEC &&
 2665                         (dp->nfsdl_flags & (NFSCLDL_RECALL | NFSCLDL_ZAPPED |
 2666                           NFSCLDL_NEEDRECLAIM | NFSCLDL_DELEGRET)) == 0) {
 2667                         clearok = 1;
 2668                         LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
 2669                             op = LIST_FIRST(&owp->nfsow_open);
 2670                             if (op != NULL) {
 2671                                 clearok = 0;
 2672                                 break;
 2673                             }
 2674                         }
 2675                         if (clearok) {
 2676                             LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
 2677                                 if (!LIST_EMPTY(&lp->nfsl_lock)) {
 2678                                     clearok = 0;
 2679                                     break;
 2680                                 }
 2681                             }
 2682                         }
 2683                         if (clearok) {
 2684                             TAILQ_REMOVE(&clp->nfsc_deleg, dp, nfsdl_list);
 2685                             LIST_REMOVE(dp, nfsdl_hash);
 2686                             TAILQ_INSERT_HEAD(&dh, dp, nfsdl_list);
 2687                             nfscl_delegcnt--;
 2688                             nfsstatsv1.cldelegates--;
 2689                         }
 2690                     }
 2691                     dp = ndp;
 2692                 }
 2693                 if (igotlock)
 2694                         nfsv4_unlock(&clp->nfsc_lock, 0);
 2695 
 2696                 /*
 2697                  * Do the recall on any layouts. To avoid trouble, always
 2698                  * come back up here after having slept.
 2699                  */
 2700                 TAILQ_INIT(&rlh);
 2701 tryagain2:
 2702                 TAILQ_FOREACH_SAFE(lyp, &clp->nfsc_layout, nfsly_list, nlyp) {
 2703                         if ((lyp->nfsly_flags & NFSLY_RECALL) != 0) {
 2704                                 /*
 2705                                  * Wait for outstanding I/O ops to be done.
 2706                                  */
 2707                                 if (lyp->nfsly_lock.nfslock_usecnt > 0 ||
 2708                                     (lyp->nfsly_lock.nfslock_lock &
 2709                                      NFSV4LOCK_LOCK) != 0) {
 2710                                         lyp->nfsly_lock.nfslock_lock |=
 2711                                             NFSV4LOCK_WANTED;
 2712                                         (void)nfsmsleep(&lyp->nfsly_lock,
 2713                                             NFSCLSTATEMUTEXPTR, PZERO, "nfslyp",
 2714                                             NULL);
 2715                                         goto tryagain2;
 2716                                 }
 2717                                 /* Move the layout to the recall list. */
 2718                                 TAILQ_REMOVE(&clp->nfsc_layout, lyp,
 2719                                     nfsly_list);
 2720                                 LIST_REMOVE(lyp, nfsly_hash);
 2721                                 TAILQ_INSERT_HEAD(&rlh, lyp, nfsly_list);
 2722 
 2723                                 /* Handle any layout commits. */
 2724                                 if (!NFSHASNOLAYOUTCOMMIT(clp->nfsc_nmp) &&
 2725                                     (lyp->nfsly_flags & NFSLY_WRITTEN) != 0) {
 2726                                         lyp->nfsly_flags &= ~NFSLY_WRITTEN;
 2727                                         NFSUNLOCKCLSTATE();
 2728                                         NFSCL_DEBUG(3, "do layoutcommit\n");
 2729                                         nfscl_dolayoutcommit(clp->nfsc_nmp, lyp,
 2730                                             cred, p);
 2731                                         NFSLOCKCLSTATE();
 2732                                         goto tryagain2;
 2733                                 }
 2734                         }
 2735                 }
 2736 
 2737                 /* Now, look for stale layouts. */
 2738                 lyp = TAILQ_LAST(&clp->nfsc_layout, nfscllayouthead);
 2739                 while (lyp != NULL) {
 2740                         nlyp = TAILQ_PREV(lyp, nfscllayouthead, nfsly_list);
 2741                         if (lyp->nfsly_timestamp < NFSD_MONOSEC &&
 2742                             (lyp->nfsly_flags & NFSLY_RECALL) == 0 &&
 2743                             lyp->nfsly_lock.nfslock_usecnt == 0 &&
 2744                             lyp->nfsly_lock.nfslock_lock == 0) {
 2745                                 NFSCL_DEBUG(4, "ret stale lay=%d\n",
 2746                                     nfscl_layoutcnt);
 2747                                 recallp = malloc(sizeof(*recallp),
 2748                                     M_NFSLAYRECALL, M_NOWAIT);
 2749                                 if (recallp == NULL)
 2750                                         break;
 2751                                 (void)nfscl_layoutrecall(NFSLAYOUTRETURN_FILE,
 2752                                     lyp, NFSLAYOUTIOMODE_ANY, 0, UINT64_MAX,
 2753                                     lyp->nfsly_stateid.seqid, recallp);
 2754                         }
 2755                         lyp = nlyp;
 2756                 }
 2757 
 2758                 /*
 2759                  * Free up any unreferenced device info structures.
 2760                  */
 2761                 LIST_FOREACH_SAFE(dip, &clp->nfsc_devinfo, nfsdi_list, ndip) {
 2762                         if (dip->nfsdi_layoutrefs == 0 &&
 2763                             dip->nfsdi_refcnt == 0) {
 2764                                 NFSCL_DEBUG(4, "freeing devinfo\n");
 2765                                 LIST_REMOVE(dip, nfsdi_list);
 2766                                 nfscl_freedevinfo(dip);
 2767                         }
 2768                 }
 2769                 NFSUNLOCKCLSTATE();
 2770 
 2771                 /* Do layout return(s), as required. */
 2772                 TAILQ_FOREACH_SAFE(lyp, &rlh, nfsly_list, nlyp) {
 2773                         TAILQ_REMOVE(&rlh, lyp, nfsly_list);
 2774                         NFSCL_DEBUG(4, "ret layout\n");
 2775                         nfscl_layoutreturn(clp->nfsc_nmp, lyp, cred, p);
 2776                         nfscl_freelayout(lyp);
 2777                 }
 2778 
 2779                 /*
 2780                  * Delegreturn any delegations cleaned out or recalled.
 2781                  */
 2782                 TAILQ_FOREACH_SAFE(dp, &dh, nfsdl_list, ndp) {
 2783                         newnfs_copycred(&dp->nfsdl_cred, cred);
 2784                         (void) nfscl_trydelegreturn(dp, cred, clp->nfsc_nmp, p);
 2785                         TAILQ_REMOVE(&dh, dp, nfsdl_list);
 2786                         FREE((caddr_t)dp, M_NFSCLDELEG);
 2787                 }
 2788 
 2789                 SLIST_INIT(&lfh);
 2790                 /*
 2791                  * Call nfscl_cleanupkext() once per second to check for
 2792                  * open/lock owners where the process has exited.
 2793                  */
 2794                 mytime = NFSD_MONOSEC;
 2795                 if (prevsec != mytime) {
 2796                         prevsec = mytime;
 2797                         nfscl_cleanupkext(clp, &lfh);
 2798                 }
 2799 
 2800                 /*
 2801                  * Do a ReleaseLockOwner for all lock owners where the
 2802                  * associated process no longer exists, as found by
 2803                  * nfscl_cleanupkext().
 2804                  */
 2805                 newnfs_setroot(cred);
 2806                 SLIST_FOREACH_SAFE(lfhp, &lfh, nfslfh_list, nlfhp) {
 2807                         LIST_FOREACH_SAFE(lp, &lfhp->nfslfh_lock, nfsl_list,
 2808                             nlp) {
 2809                                 (void)nfsrpc_rellockown(clp->nfsc_nmp, lp,
 2810                                     lfhp->nfslfh_fh, lfhp->nfslfh_len, cred,
 2811                                     p);
 2812                                 nfscl_freelockowner(lp, 0);
 2813                         }
 2814                         free(lfhp, M_TEMP);
 2815                 }
 2816                 SLIST_INIT(&lfh);
 2817 
 2818                 NFSLOCKCLSTATE();
 2819                 if ((clp->nfsc_flags & NFSCLFLAGS_RECOVER) == 0)
 2820                         (void)mtx_sleep(clp, NFSCLSTATEMUTEXPTR, PWAIT, "nfscl",
 2821                             hz);
 2822                 if (clp->nfsc_flags & NFSCLFLAGS_UMOUNT) {
 2823                         clp->nfsc_flags &= ~NFSCLFLAGS_HASTHREAD;
 2824                         NFSUNLOCKCLSTATE();
 2825                         NFSFREECRED(cred);
 2826                         wakeup((caddr_t)clp);
 2827                         return;
 2828                 }
 2829                 NFSUNLOCKCLSTATE();
 2830         }
 2831 }
 2832 
 2833 /*
 2834  * Initiate state recovery. Called when NFSERR_STALECLIENTID,
 2835  * NFSERR_STALESTATEID or NFSERR_BADSESSION is received.
 2836  */
 2837 APPLESTATIC void
 2838 nfscl_initiate_recovery(struct nfsclclient *clp)
 2839 {
 2840 
 2841         if (clp == NULL)
 2842                 return;
 2843         NFSLOCKCLSTATE();
 2844         clp->nfsc_flags |= NFSCLFLAGS_RECOVER;
 2845         NFSUNLOCKCLSTATE();
 2846         wakeup((caddr_t)clp);
 2847 }
 2848 
 2849 /*
 2850  * Dump out the state stuff for debugging.
 2851  */
 2852 APPLESTATIC void
 2853 nfscl_dumpstate(struct nfsmount *nmp, int openowner, int opens,
 2854     int lockowner, int locks)
 2855 {
 2856         struct nfsclclient *clp;
 2857         struct nfsclowner *owp;
 2858         struct nfsclopen *op;
 2859         struct nfscllockowner *lp;
 2860         struct nfscllock *lop;
 2861         struct nfscldeleg *dp;
 2862 
 2863         clp = nmp->nm_clp;
 2864         if (clp == NULL) {
 2865                 printf("nfscl dumpstate NULL clp\n");
 2866                 return;
 2867         }
 2868         NFSLOCKCLSTATE();
 2869         TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
 2870           LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
 2871             if (openowner && !LIST_EMPTY(&owp->nfsow_open))
 2872                 printf("owner=0x%x 0x%x 0x%x 0x%x seqid=%d\n",
 2873                     owp->nfsow_owner[0], owp->nfsow_owner[1],
 2874                     owp->nfsow_owner[2], owp->nfsow_owner[3],
 2875                     owp->nfsow_seqid);
 2876             LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 2877                 if (opens)
 2878                     printf("open st=0x%x 0x%x 0x%x cnt=%d fh12=0x%x\n",
 2879                         op->nfso_stateid.other[0], op->nfso_stateid.other[1],
 2880                         op->nfso_stateid.other[2], op->nfso_opencnt,
 2881                         op->nfso_fh[12]);
 2882                 LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
 2883                     if (lockowner)
 2884                         printf("lckown=0x%x 0x%x 0x%x 0x%x seqid=%d st=0x%x 0x%x 0x%x\n",
 2885                             lp->nfsl_owner[0], lp->nfsl_owner[1],
 2886                             lp->nfsl_owner[2], lp->nfsl_owner[3],
 2887                             lp->nfsl_seqid,
 2888                             lp->nfsl_stateid.other[0], lp->nfsl_stateid.other[1],
 2889                             lp->nfsl_stateid.other[2]);
 2890                     LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
 2891                         if (locks)
 2892 #ifdef __FreeBSD__
 2893                             printf("lck typ=%d fst=%ju end=%ju\n",
 2894                                 lop->nfslo_type, (intmax_t)lop->nfslo_first,
 2895                                 (intmax_t)lop->nfslo_end);
 2896 #else
 2897                             printf("lck typ=%d fst=%qd end=%qd\n",
 2898                                 lop->nfslo_type, lop->nfslo_first,
 2899                                 lop->nfslo_end);
 2900 #endif
 2901                     }
 2902                 }
 2903             }
 2904           }
 2905         }
 2906         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 2907             if (openowner && !LIST_EMPTY(&owp->nfsow_open))
 2908                 printf("owner=0x%x 0x%x 0x%x 0x%x seqid=%d\n",
 2909                     owp->nfsow_owner[0], owp->nfsow_owner[1],
 2910                     owp->nfsow_owner[2], owp->nfsow_owner[3],
 2911                     owp->nfsow_seqid);
 2912             LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 2913                 if (opens)
 2914                     printf("open st=0x%x 0x%x 0x%x cnt=%d fh12=0x%x\n",
 2915                         op->nfso_stateid.other[0], op->nfso_stateid.other[1],
 2916                         op->nfso_stateid.other[2], op->nfso_opencnt,
 2917                         op->nfso_fh[12]);
 2918                 LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
 2919                     if (lockowner)
 2920                         printf("lckown=0x%x 0x%x 0x%x 0x%x seqid=%d st=0x%x 0x%x 0x%x\n",
 2921                             lp->nfsl_owner[0], lp->nfsl_owner[1],
 2922                             lp->nfsl_owner[2], lp->nfsl_owner[3],
 2923                             lp->nfsl_seqid,
 2924                             lp->nfsl_stateid.other[0], lp->nfsl_stateid.other[1],
 2925                             lp->nfsl_stateid.other[2]);
 2926                     LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
 2927                         if (locks)
 2928 #ifdef __FreeBSD__
 2929                             printf("lck typ=%d fst=%ju end=%ju\n",
 2930                                 lop->nfslo_type, (intmax_t)lop->nfslo_first,
 2931                                 (intmax_t)lop->nfslo_end);
 2932 #else
 2933                             printf("lck typ=%d fst=%qd end=%qd\n",
 2934                                 lop->nfslo_type, lop->nfslo_first,
 2935                                 lop->nfslo_end);
 2936 #endif
 2937                     }
 2938                 }
 2939             }
 2940         }
 2941         NFSUNLOCKCLSTATE();
 2942 }
 2943 
 2944 /*
 2945  * Check for duplicate open owners and opens.
 2946  * (Only used as a diagnostic aid.)
 2947  */
 2948 APPLESTATIC void
 2949 nfscl_dupopen(vnode_t vp, int dupopens)
 2950 {
 2951         struct nfsclclient *clp;
 2952         struct nfsclowner *owp, *owp2;
 2953         struct nfsclopen *op, *op2;
 2954         struct nfsfh *nfhp;
 2955 
 2956         clp = VFSTONFS(vnode_mount(vp))->nm_clp;
 2957         if (clp == NULL) {
 2958                 printf("nfscl dupopen NULL clp\n");
 2959                 return;
 2960         }
 2961         nfhp = VTONFS(vp)->n_fhp;
 2962         NFSLOCKCLSTATE();
 2963 
 2964         /*
 2965          * First, search for duplicate owners.
 2966          * These should never happen!
 2967          */
 2968         LIST_FOREACH(owp2, &clp->nfsc_owner, nfsow_list) {
 2969             LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 2970                 if (owp != owp2 &&
 2971                     !NFSBCMP(owp->nfsow_owner, owp2->nfsow_owner,
 2972                     NFSV4CL_LOCKNAMELEN)) {
 2973                         NFSUNLOCKCLSTATE();
 2974                         printf("DUP OWNER\n");
 2975                         nfscl_dumpstate(VFSTONFS(vnode_mount(vp)), 1, 1, 0, 0);
 2976                         return;
 2977                 }
 2978             }
 2979         }
 2980 
 2981         /*
 2982          * Now, search for duplicate stateids.
 2983          * These shouldn't happen, either.
 2984          */
 2985         LIST_FOREACH(owp2, &clp->nfsc_owner, nfsow_list) {
 2986             LIST_FOREACH(op2, &owp2->nfsow_open, nfso_list) {
 2987                 LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 2988                     LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 2989                         if (op != op2 &&
 2990                             (op->nfso_stateid.other[0] != 0 ||
 2991                              op->nfso_stateid.other[1] != 0 ||
 2992                              op->nfso_stateid.other[2] != 0) &&
 2993                             op->nfso_stateid.other[0] == op2->nfso_stateid.other[0] &&
 2994                             op->nfso_stateid.other[1] == op2->nfso_stateid.other[1] &&
 2995                             op->nfso_stateid.other[2] == op2->nfso_stateid.other[2]) {
 2996                             NFSUNLOCKCLSTATE();
 2997                             printf("DUP STATEID\n");
 2998                             nfscl_dumpstate(VFSTONFS(vnode_mount(vp)), 1, 1, 0,
 2999                                 0);
 3000                             return;
 3001                         }
 3002                     }
 3003                 }
 3004             }
 3005         }
 3006 
 3007         /*
 3008          * Now search for duplicate opens.
 3009          * Duplicate opens for the same owner
 3010          * should never occur. Other duplicates are
 3011          * possible and are checked for if "dupopens"
 3012          * is true.
 3013          */
 3014         LIST_FOREACH(owp2, &clp->nfsc_owner, nfsow_list) {
 3015             LIST_FOREACH(op2, &owp2->nfsow_open, nfso_list) {
 3016                 if (nfhp->nfh_len == op2->nfso_fhlen &&
 3017                     !NFSBCMP(nfhp->nfh_fh, op2->nfso_fh, nfhp->nfh_len)) {
 3018                     LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 3019                         LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 3020                             if (op != op2 && nfhp->nfh_len == op->nfso_fhlen &&
 3021                                 !NFSBCMP(nfhp->nfh_fh, op->nfso_fh, nfhp->nfh_len) &&
 3022                                 (!NFSBCMP(op->nfso_own->nfsow_owner,
 3023                                  op2->nfso_own->nfsow_owner, NFSV4CL_LOCKNAMELEN) ||
 3024                                  dupopens)) {
 3025                                 if (!NFSBCMP(op->nfso_own->nfsow_owner,
 3026                                     op2->nfso_own->nfsow_owner, NFSV4CL_LOCKNAMELEN)) {
 3027                                     NFSUNLOCKCLSTATE();
 3028                                     printf("BADDUP OPEN\n");
 3029                                 } else {
 3030                                     NFSUNLOCKCLSTATE();
 3031                                     printf("DUP OPEN\n");
 3032                                 }
 3033                                 nfscl_dumpstate(VFSTONFS(vnode_mount(vp)), 1, 1,
 3034                                     0, 0);
 3035                                 return;
 3036                             }
 3037                         }
 3038                     }
 3039                 }
 3040             }
 3041         }
 3042         NFSUNLOCKCLSTATE();
 3043 }
 3044 
 3045 /*
 3046  * During close, find an open that needs to be dereferenced and
 3047  * dereference it. If there are no more opens for this file,
 3048  * log a message to that effect.
 3049  * Opens aren't actually Close'd until VOP_INACTIVE() is performed
 3050  * on the file's vnode.
 3051  * This is the safe way, since it is difficult to identify
 3052  * which open the close is for and I/O can be performed after the
 3053  * close(2) system call when a file is mmap'd.
 3054  * If it returns 0 for success, there will be a referenced
 3055  * clp returned via clpp.
 3056  */
 3057 APPLESTATIC int
 3058 nfscl_getclose(vnode_t vp, struct nfsclclient **clpp)
 3059 {
 3060         struct nfsclclient *clp;
 3061         struct nfsclowner *owp;
 3062         struct nfsclopen *op;
 3063         struct nfscldeleg *dp;
 3064         struct nfsfh *nfhp;
 3065         int error, notdecr;
 3066 
 3067         error = nfscl_getcl(vnode_mount(vp), NULL, NULL, 1, &clp);
 3068         if (error)
 3069                 return (error);
 3070         *clpp = clp;
 3071 
 3072         nfhp = VTONFS(vp)->n_fhp;
 3073         notdecr = 1;
 3074         NFSLOCKCLSTATE();
 3075         /*
 3076          * First, look for one under a delegation that was locally issued
 3077          * and just decrement the opencnt for it. Since all my Opens against
 3078          * the server are DENY_NONE, I don't see a problem with hanging
 3079          * onto them. (It is much easier to use one of the extant Opens
 3080          * that I already have on the server when a Delegation is recalled
 3081          * than to do fresh Opens.) Someday, I might need to rethink this, but.
 3082          */
 3083         dp = nfscl_finddeleg(clp, nfhp->nfh_fh, nfhp->nfh_len);
 3084         if (dp != NULL) {
 3085                 LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
 3086                         op = LIST_FIRST(&owp->nfsow_open);
 3087                         if (op != NULL) {
 3088                                 /*
 3089                                  * Since a delegation is for a file, there
 3090                                  * should never be more than one open for
 3091                                  * each openowner.
 3092                                  */
 3093                                 if (LIST_NEXT(op, nfso_list) != NULL)
 3094                                         panic("nfscdeleg opens");
 3095                                 if (notdecr && op->nfso_opencnt > 0) {
 3096                                         notdecr = 0;
 3097                                         op->nfso_opencnt--;
 3098                                         break;
 3099                                 }
 3100                         }
 3101                 }
 3102         }
 3103 
 3104         /* Now process the opens against the server. */
 3105         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 3106                 LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 3107                         if (op->nfso_fhlen == nfhp->nfh_len &&
 3108                             !NFSBCMP(op->nfso_fh, nfhp->nfh_fh,
 3109                             nfhp->nfh_len)) {
 3110                                 /* Found an open, decrement cnt if possible */
 3111                                 if (notdecr && op->nfso_opencnt > 0) {
 3112                                         notdecr = 0;
 3113                                         op->nfso_opencnt--;
 3114                                 }
 3115                                 /*
 3116                                  * There are more opens, so just return.
 3117                                  */
 3118                                 if (op->nfso_opencnt > 0) {
 3119                                         NFSUNLOCKCLSTATE();
 3120                                         return (0);
 3121                                 }
 3122                         }
 3123                 }
 3124         }
 3125         NFSUNLOCKCLSTATE();
 3126         if (notdecr)
 3127                 printf("nfscl: never fnd open\n");
 3128         return (0);
 3129 }
 3130 
 3131 APPLESTATIC int
 3132 nfscl_doclose(vnode_t vp, struct nfsclclient **clpp, NFSPROC_T *p)
 3133 {
 3134         struct nfsclclient *clp;
 3135         struct nfsclowner *owp, *nowp;
 3136         struct nfsclopen *op;
 3137         struct nfscldeleg *dp;
 3138         struct nfsfh *nfhp;
 3139         struct nfsclrecalllayout *recallp;
 3140         int error;
 3141 
 3142         error = nfscl_getcl(vnode_mount(vp), NULL, NULL, 1, &clp);
 3143         if (error)
 3144                 return (error);
 3145         *clpp = clp;
 3146 
 3147         nfhp = VTONFS(vp)->n_fhp;
 3148         recallp = malloc(sizeof(*recallp), M_NFSLAYRECALL, M_WAITOK);
 3149         NFSLOCKCLSTATE();
 3150         /*
 3151          * First get rid of the local Open structures, which should be no
 3152          * longer in use.
 3153          */
 3154         dp = nfscl_finddeleg(clp, nfhp->nfh_fh, nfhp->nfh_len);
 3155         if (dp != NULL) {
 3156                 LIST_FOREACH_SAFE(owp, &dp->nfsdl_owner, nfsow_list, nowp) {
 3157                         op = LIST_FIRST(&owp->nfsow_open);
 3158                         if (op != NULL) {
 3159                                 KASSERT((op->nfso_opencnt == 0),
 3160                                     ("nfscl: bad open cnt on deleg"));
 3161                                 nfscl_freeopen(op, 1);
 3162                         }
 3163                         nfscl_freeopenowner(owp, 1);
 3164                 }
 3165         }
 3166 
 3167         /* Return any layouts marked return on close. */
 3168         nfscl_retoncloselayout(vp, clp, nfhp->nfh_fh, nfhp->nfh_len, &recallp);
 3169 
 3170         /* Now process the opens against the server. */
 3171 lookformore:
 3172         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 3173                 op = LIST_FIRST(&owp->nfsow_open);
 3174                 while (op != NULL) {
 3175                         if (op->nfso_fhlen == nfhp->nfh_len &&
 3176                             !NFSBCMP(op->nfso_fh, nfhp->nfh_fh,
 3177                             nfhp->nfh_len)) {
 3178                                 /* Found an open, close it. */
 3179                                 KASSERT((op->nfso_opencnt == 0),
 3180                                     ("nfscl: bad open cnt on server"));
 3181                                 NFSUNLOCKCLSTATE();
 3182                                 nfsrpc_doclose(VFSTONFS(vnode_mount(vp)), op,
 3183                                     p);
 3184                                 NFSLOCKCLSTATE();
 3185                                 goto lookformore;
 3186                         }
 3187                         op = LIST_NEXT(op, nfso_list);
 3188                 }
 3189         }
 3190         NFSUNLOCKCLSTATE();
 3191         /*
 3192          * recallp has been set NULL by nfscl_retoncloselayout() if it was
 3193          * used by the function, but calling free() with a NULL pointer is ok.
 3194          */
 3195         free(recallp, M_NFSLAYRECALL);
 3196         return (0);
 3197 }
 3198 
 3199 /*
 3200  * Return all delegations on this client.
 3201  * (Must be called with client sleep lock.)
 3202  */
 3203 static void
 3204 nfscl_delegreturnall(struct nfsclclient *clp, NFSPROC_T *p)
 3205 {
 3206         struct nfscldeleg *dp, *ndp;
 3207         struct ucred *cred;
 3208 
 3209         cred = newnfs_getcred();
 3210         TAILQ_FOREACH_SAFE(dp, &clp->nfsc_deleg, nfsdl_list, ndp) {
 3211                 nfscl_cleandeleg(dp);
 3212                 (void) nfscl_trydelegreturn(dp, cred, clp->nfsc_nmp, p);
 3213                 nfscl_freedeleg(&clp->nfsc_deleg, dp);
 3214         }
 3215         NFSFREECRED(cred);
 3216 }
 3217 
 3218 /*
 3219  * Do a callback RPC.
 3220  */
 3221 APPLESTATIC void
 3222 nfscl_docb(struct nfsrv_descript *nd, NFSPROC_T *p)
 3223 {
 3224         int clist, gotseq_ok, i, j, k, op, rcalls;
 3225         u_int32_t *tl;
 3226         struct nfsclclient *clp;
 3227         struct nfscldeleg *dp = NULL;
 3228         int numops, taglen = -1, error = 0, trunc;
 3229         u_int32_t minorvers = 0, retops = 0, *retopsp = NULL, *repp, cbident;
 3230         u_char tag[NFSV4_SMALLSTR + 1], *tagstr;
 3231         vnode_t vp = NULL;
 3232         struct nfsnode *np;
 3233         struct vattr va;
 3234         struct nfsfh *nfhp;
 3235         mount_t mp;
 3236         nfsattrbit_t attrbits, rattrbits;
 3237         nfsv4stateid_t stateid;
 3238         uint32_t seqid, slotid = 0, highslot, cachethis;
 3239         uint8_t sessionid[NFSX_V4SESSIONID];
 3240         struct mbuf *rep;
 3241         struct nfscllayout *lyp;
 3242         uint64_t filesid[2], len, off;
 3243         int changed, gotone, laytype, recalltype;
 3244         uint32_t iomode;
 3245         struct nfsclrecalllayout *recallp = NULL;
 3246         struct nfsclsession *tsep;
 3247 
 3248         gotseq_ok = 0;
 3249         nfsrvd_rephead(nd);
 3250         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 3251         taglen = fxdr_unsigned(int, *tl);
 3252         if (taglen < 0) {
 3253                 error = EBADRPC;
 3254                 goto nfsmout;
 3255         }
 3256         if (taglen <= NFSV4_SMALLSTR)
 3257                 tagstr = tag;
 3258         else
 3259                 tagstr = malloc(taglen + 1, M_TEMP, M_WAITOK);
 3260         error = nfsrv_mtostr(nd, tagstr, taglen);
 3261         if (error) {
 3262                 if (taglen > NFSV4_SMALLSTR)
 3263                         free(tagstr, M_TEMP);
 3264                 taglen = -1;
 3265                 goto nfsmout;
 3266         }
 3267         (void) nfsm_strtom(nd, tag, taglen);
 3268         if (taglen > NFSV4_SMALLSTR) {
 3269                 free(tagstr, M_TEMP);
 3270         }
 3271         NFSM_BUILD(retopsp, u_int32_t *, NFSX_UNSIGNED);
 3272         NFSM_DISSECT(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
 3273         minorvers = fxdr_unsigned(u_int32_t, *tl++);
 3274         if (minorvers != NFSV4_MINORVERSION && minorvers != NFSV41_MINORVERSION)
 3275                 nd->nd_repstat = NFSERR_MINORVERMISMATCH;
 3276         cbident = fxdr_unsigned(u_int32_t, *tl++);
 3277         if (nd->nd_repstat)
 3278                 numops = 0;
 3279         else
 3280                 numops = fxdr_unsigned(int, *tl);
 3281         /*
 3282          * Loop around doing the sub ops.
 3283          */
 3284         for (i = 0; i < numops; i++) {
 3285                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 3286                 NFSM_BUILD(repp, u_int32_t *, 2 * NFSX_UNSIGNED);
 3287                 *repp++ = *tl;
 3288                 op = fxdr_unsigned(int, *tl);
 3289                 if (op < NFSV4OP_CBGETATTR ||
 3290                    (op > NFSV4OP_CBRECALL && minorvers == NFSV4_MINORVERSION) ||
 3291                    (op > NFSV4OP_CBNOTIFYDEVID &&
 3292                     minorvers == NFSV41_MINORVERSION)) {
 3293                     nd->nd_repstat = NFSERR_OPILLEGAL;
 3294                     *repp = nfscl_errmap(nd, minorvers);
 3295                     retops++;
 3296                     break;
 3297                 }
 3298                 nd->nd_procnum = op;
 3299                 if (op < NFSV41_CBNOPS)
 3300                         nfsstatsv1.cbrpccnt[nd->nd_procnum]++;
 3301                 switch (op) {
 3302                 case NFSV4OP_CBGETATTR:
 3303                         NFSCL_DEBUG(4, "cbgetattr\n");
 3304                         mp = NULL;
 3305                         vp = NULL;
 3306                         error = nfsm_getfh(nd, &nfhp);
 3307                         if (!error)
 3308                                 error = nfsrv_getattrbits(nd, &attrbits,
 3309                                     NULL, NULL);
 3310                         if (error == 0 && i == 0 &&
 3311                             minorvers != NFSV4_MINORVERSION)
 3312                                 error = NFSERR_OPNOTINSESS;
 3313                         if (!error) {
 3314                                 mp = nfscl_getmnt(minorvers, sessionid, cbident,
 3315                                     &clp);
 3316                                 if (mp == NULL)
 3317                                         error = NFSERR_SERVERFAULT;
 3318                         }
 3319                         if (!error) {
 3320                                 error = nfscl_ngetreopen(mp, nfhp->nfh_fh,
 3321                                     nfhp->nfh_len, p, &np);
 3322                                 if (!error)
 3323                                         vp = NFSTOV(np);
 3324                         }
 3325                         if (!error) {
 3326                                 NFSZERO_ATTRBIT(&rattrbits);
 3327                                 NFSLOCKCLSTATE();
 3328                                 dp = nfscl_finddeleg(clp, nfhp->nfh_fh,
 3329                                     nfhp->nfh_len);
 3330                                 if (dp != NULL) {
 3331                                         if (NFSISSET_ATTRBIT(&attrbits,
 3332                                             NFSATTRBIT_SIZE)) {
 3333                                                 if (vp != NULL)
 3334                                                         va.va_size = np->n_size;
 3335                                                 else
 3336                                                         va.va_size =
 3337                                                             dp->nfsdl_size;
 3338                                                 NFSSETBIT_ATTRBIT(&rattrbits,
 3339                                                     NFSATTRBIT_SIZE);
 3340                                         }
 3341                                         if (NFSISSET_ATTRBIT(&attrbits,
 3342                                             NFSATTRBIT_CHANGE)) {
 3343                                                 va.va_filerev =
 3344                                                     dp->nfsdl_change;
 3345                                                 if (vp == NULL ||
 3346                                                     (np->n_flag & NDELEGMOD))
 3347                                                         va.va_filerev++;
 3348                                                 NFSSETBIT_ATTRBIT(&rattrbits,
 3349                                                     NFSATTRBIT_CHANGE);
 3350                                         }
 3351                                 } else
 3352                                         error = NFSERR_SERVERFAULT;
 3353                                 NFSUNLOCKCLSTATE();
 3354                         }
 3355                         if (vp != NULL)
 3356                                 vrele(vp);
 3357                         if (mp != NULL)
 3358                                 vfs_unbusy(mp);
 3359                         if (nfhp != NULL)
 3360                                 FREE((caddr_t)nfhp, M_NFSFH);
 3361                         if (!error)
 3362                                 (void) nfsv4_fillattr(nd, NULL, NULL, NULL, &va,
 3363                                     NULL, 0, &rattrbits, NULL, p, 0, 0, 0, 0,
 3364                                     (uint64_t)0);
 3365                         break;
 3366                 case NFSV4OP_CBRECALL:
 3367                         NFSCL_DEBUG(4, "cbrecall\n");
 3368                         NFSM_DISSECT(tl, u_int32_t *, NFSX_STATEID +
 3369                             NFSX_UNSIGNED);
 3370                         stateid.seqid = *tl++;
 3371                         NFSBCOPY((caddr_t)tl, (caddr_t)stateid.other,
 3372                             NFSX_STATEIDOTHER);
 3373                         tl += (NFSX_STATEIDOTHER / NFSX_UNSIGNED);
 3374                         trunc = fxdr_unsigned(int, *tl);
 3375                         error = nfsm_getfh(nd, &nfhp);
 3376                         if (error == 0 && i == 0 &&
 3377                             minorvers != NFSV4_MINORVERSION)
 3378                                 error = NFSERR_OPNOTINSESS;
 3379                         if (!error) {
 3380                                 NFSLOCKCLSTATE();
 3381                                 if (minorvers == NFSV4_MINORVERSION)
 3382                                         clp = nfscl_getclnt(cbident);
 3383                                 else
 3384                                         clp = nfscl_getclntsess(sessionid);
 3385                                 if (clp != NULL) {
 3386                                         dp = nfscl_finddeleg(clp, nfhp->nfh_fh,
 3387                                             nfhp->nfh_len);
 3388                                         if (dp != NULL && (dp->nfsdl_flags &
 3389                                             NFSCLDL_DELEGRET) == 0) {
 3390                                                 dp->nfsdl_flags |=
 3391                                                     NFSCLDL_RECALL;
 3392                                                 wakeup((caddr_t)clp);
 3393                                         }
 3394                                 } else {
 3395                                         error = NFSERR_SERVERFAULT;
 3396                                 }
 3397                                 NFSUNLOCKCLSTATE();
 3398                         }
 3399                         if (nfhp != NULL)
 3400                                 FREE((caddr_t)nfhp, M_NFSFH);
 3401                         break;
 3402                 case NFSV4OP_CBLAYOUTRECALL:
 3403                         NFSCL_DEBUG(4, "cblayrec\n");
 3404                         nfhp = NULL;
 3405                         NFSM_DISSECT(tl, uint32_t *, 4 * NFSX_UNSIGNED);
 3406                         laytype = fxdr_unsigned(int, *tl++);
 3407                         iomode = fxdr_unsigned(uint32_t, *tl++);
 3408                         if (newnfs_true == *tl++)
 3409                                 changed = 1;
 3410                         else
 3411                                 changed = 0;
 3412                         recalltype = fxdr_unsigned(int, *tl);
 3413                         recallp = malloc(sizeof(*recallp), M_NFSLAYRECALL,
 3414                             M_WAITOK);
 3415                         if (laytype != NFSLAYOUT_NFSV4_1_FILES)
 3416                                 error = NFSERR_NOMATCHLAYOUT;
 3417                         else if (recalltype == NFSLAYOUTRETURN_FILE) {
 3418                                 error = nfsm_getfh(nd, &nfhp);
 3419                                 NFSCL_DEBUG(4, "retfile getfh=%d\n", error);
 3420                                 if (error != 0)
 3421                                         goto nfsmout;
 3422                                 NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_HYPER +
 3423                                     NFSX_STATEID);
 3424                                 off = fxdr_hyper(tl); tl += 2;
 3425                                 len = fxdr_hyper(tl); tl += 2;
 3426                                 stateid.seqid = fxdr_unsigned(uint32_t, *tl++);
 3427                                 NFSBCOPY(tl, stateid.other, NFSX_STATEIDOTHER);
 3428                                 if (minorvers == NFSV4_MINORVERSION)
 3429                                         error = NFSERR_NOTSUPP;
 3430                                 else if (i == 0)
 3431                                         error = NFSERR_OPNOTINSESS;
 3432                                 if (error == 0) {
 3433                                         NFSLOCKCLSTATE();
 3434                                         clp = nfscl_getclntsess(sessionid);
 3435                                         NFSCL_DEBUG(4, "cbly clp=%p\n", clp);
 3436                                         if (clp != NULL) {
 3437                                                 lyp = nfscl_findlayout(clp,
 3438                                                     nfhp->nfh_fh,
 3439                                                     nfhp->nfh_len);
 3440                                                 NFSCL_DEBUG(4, "cblyp=%p\n",
 3441                                                     lyp);
 3442                                                 if (lyp != NULL &&
 3443                                                     (lyp->nfsly_flags &
 3444                                                      NFSLY_FILES) != 0 &&
 3445                                                     !NFSBCMP(stateid.other,
 3446                                                     lyp->nfsly_stateid.other,
 3447                                                     NFSX_STATEIDOTHER)) {
 3448                                                         error =
 3449                                                             nfscl_layoutrecall(
 3450                                                             recalltype,
 3451                                                             lyp, iomode, off,
 3452                                                             len, stateid.seqid,
 3453                                                             recallp);
 3454                                                         recallp = NULL;
 3455                                                         wakeup(clp);
 3456                                                         NFSCL_DEBUG(4,
 3457                                                             "aft layrcal=%d\n",
 3458                                                             error);
 3459                                                 } else
 3460                                                         error =
 3461                                                           NFSERR_NOMATCHLAYOUT;
 3462                                         } else
 3463                                                 error = NFSERR_NOMATCHLAYOUT;
 3464                                         NFSUNLOCKCLSTATE();
 3465                                 }
 3466                                 free(nfhp, M_NFSFH);
 3467                         } else if (recalltype == NFSLAYOUTRETURN_FSID) {
 3468                                 NFSM_DISSECT(tl, uint32_t *, 2 * NFSX_HYPER);
 3469                                 filesid[0] = fxdr_hyper(tl); tl += 2;
 3470                                 filesid[1] = fxdr_hyper(tl); tl += 2;
 3471                                 gotone = 0;
 3472                                 NFSLOCKCLSTATE();
 3473                                 clp = nfscl_getclntsess(sessionid);
 3474                                 if (clp != NULL) {
 3475                                         TAILQ_FOREACH(lyp, &clp->nfsc_layout,
 3476                                             nfsly_list) {
 3477                                                 if (lyp->nfsly_filesid[0] ==
 3478                                                     filesid[0] &&
 3479                                                     lyp->nfsly_filesid[1] ==
 3480                                                     filesid[1]) {
 3481                                                         error =
 3482                                                             nfscl_layoutrecall(
 3483                                                             recalltype,
 3484                                                             lyp, iomode, 0,
 3485                                                             UINT64_MAX,
 3486                                                             lyp->nfsly_stateid.seqid,
 3487                                                             recallp);
 3488                                                         recallp = NULL;
 3489                                                         gotone = 1;
 3490                                                 }
 3491                                         }
 3492                                         if (gotone != 0)
 3493                                                 wakeup(clp);
 3494                                         else
 3495                                                 error = NFSERR_NOMATCHLAYOUT;
 3496                                 } else
 3497                                         error = NFSERR_NOMATCHLAYOUT;
 3498                                 NFSUNLOCKCLSTATE();
 3499                         } else if (recalltype == NFSLAYOUTRETURN_ALL) {
 3500                                 gotone = 0;
 3501                                 NFSLOCKCLSTATE();
 3502                                 clp = nfscl_getclntsess(sessionid);
 3503                                 if (clp != NULL) {
 3504                                         TAILQ_FOREACH(lyp, &clp->nfsc_layout,
 3505                                             nfsly_list) {
 3506                                                 error = nfscl_layoutrecall(
 3507                                                     recalltype, lyp, iomode, 0,
 3508                                                     UINT64_MAX,
 3509                                                     lyp->nfsly_stateid.seqid,
 3510                                                     recallp);
 3511                                                 recallp = NULL;
 3512                                                 gotone = 1;
 3513                                         }
 3514                                         if (gotone != 0)
 3515                                                 wakeup(clp);
 3516                                         else
 3517                                                 error = NFSERR_NOMATCHLAYOUT;
 3518                                 } else
 3519                                         error = NFSERR_NOMATCHLAYOUT;
 3520                                 NFSUNLOCKCLSTATE();
 3521                         } else
 3522                                 error = NFSERR_NOMATCHLAYOUT;
 3523                         if (recallp != NULL) {
 3524                                 free(recallp, M_NFSLAYRECALL);
 3525                                 recallp = NULL;
 3526                         }
 3527                         break;
 3528                 case NFSV4OP_CBSEQUENCE:
 3529                         NFSM_DISSECT(tl, uint32_t *, NFSX_V4SESSIONID +
 3530                             5 * NFSX_UNSIGNED);
 3531                         bcopy(tl, sessionid, NFSX_V4SESSIONID);
 3532                         tl += NFSX_V4SESSIONID / NFSX_UNSIGNED;
 3533                         seqid = fxdr_unsigned(uint32_t, *tl++);
 3534                         slotid = fxdr_unsigned(uint32_t, *tl++);
 3535                         highslot = fxdr_unsigned(uint32_t, *tl++);
 3536                         cachethis = *tl++;
 3537                         /* Throw away the referring call stuff. */
 3538                         clist = fxdr_unsigned(int, *tl);
 3539                         for (j = 0; j < clist; j++) {
 3540                                 NFSM_DISSECT(tl, uint32_t *, NFSX_V4SESSIONID +
 3541                                     NFSX_UNSIGNED);
 3542                                 tl += NFSX_V4SESSIONID / NFSX_UNSIGNED;
 3543                                 rcalls = fxdr_unsigned(int, *tl);
 3544                                 for (k = 0; k < rcalls; k++) {
 3545                                         NFSM_DISSECT(tl, uint32_t *,
 3546                                             2 * NFSX_UNSIGNED);
 3547                                 }
 3548                         }
 3549                         NFSLOCKCLSTATE();
 3550                         if (i == 0) {
 3551                                 clp = nfscl_getclntsess(sessionid);
 3552                                 if (clp == NULL)
 3553                                         error = NFSERR_SERVERFAULT;
 3554                         } else
 3555                                 error = NFSERR_SEQUENCEPOS;
 3556                         if (error == 0) {
 3557                                 tsep = nfsmnt_mdssession(clp->nfsc_nmp);
 3558                                 error = nfsv4_seqsession(seqid, slotid,
 3559                                     highslot, tsep->nfsess_cbslots, &rep,
 3560                                     tsep->nfsess_backslots);
 3561                         }
 3562                         NFSUNLOCKCLSTATE();
 3563                         if (error == 0 || error == NFSERR_REPLYFROMCACHE) {
 3564                                 gotseq_ok = 1;
 3565                                 if (rep != NULL) {
 3566                                         /*
 3567                                          * Handle a reply for a retried
 3568                                          * callback.  The reply will be
 3569                                          * re-inserted in the session cache
 3570                                          * by the nfsv4_seqsess_cacherep() call
 3571                                          * after out:
 3572                                          */
 3573                                         KASSERT(error == NFSERR_REPLYFROMCACHE,
 3574                                             ("cbsequence: non-NULL rep"));
 3575                                         NFSCL_DEBUG(4, "Got cbretry\n");
 3576                                         m_freem(nd->nd_mreq);
 3577                                         nd->nd_mreq = rep;
 3578                                         rep = NULL;
 3579                                         goto out;
 3580                                 }
 3581                                 NFSM_BUILD(tl, uint32_t *,
 3582                                     NFSX_V4SESSIONID + 4 * NFSX_UNSIGNED);
 3583                                 bcopy(sessionid, tl, NFSX_V4SESSIONID);
 3584                                 tl += NFSX_V4SESSIONID / NFSX_UNSIGNED;
 3585                                 *tl++ = txdr_unsigned(seqid);
 3586                                 *tl++ = txdr_unsigned(slotid);
 3587                                 *tl++ = txdr_unsigned(NFSV4_CBSLOTS - 1);
 3588                                 *tl = txdr_unsigned(NFSV4_CBSLOTS - 1);
 3589                         }
 3590                         break;
 3591                 default:
 3592                         if (i == 0 && minorvers == NFSV41_MINORVERSION)
 3593                                 error = NFSERR_OPNOTINSESS;
 3594                         else {
 3595                                 NFSCL_DEBUG(1, "unsupp callback %d\n", op);
 3596                                 error = NFSERR_NOTSUPP;
 3597                         }
 3598                         break;
 3599                 }
 3600                 if (error) {
 3601                         if (error == EBADRPC || error == NFSERR_BADXDR) {
 3602                                 nd->nd_repstat = NFSERR_BADXDR;
 3603                         } else {
 3604                                 nd->nd_repstat = error;
 3605                         }
 3606                         error = 0;
 3607                 }
 3608                 retops++;
 3609                 if (nd->nd_repstat) {
 3610                         *repp = nfscl_errmap(nd, minorvers);
 3611                         break;
 3612                 } else
 3613                         *repp = 0;      /* NFS4_OK */
 3614         }
 3615 nfsmout:
 3616         if (recallp != NULL)
 3617                 free(recallp, M_NFSLAYRECALL);
 3618         if (error) {
 3619                 if (error == EBADRPC || error == NFSERR_BADXDR)
 3620                         nd->nd_repstat = NFSERR_BADXDR;
 3621                 else
 3622                         printf("nfsv4 comperr1=%d\n", error);
 3623         }
 3624         if (taglen == -1) {
 3625                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
 3626                 *tl++ = 0;
 3627                 *tl = 0;
 3628         } else {
 3629                 *retopsp = txdr_unsigned(retops);
 3630         }
 3631         *nd->nd_errp = nfscl_errmap(nd, minorvers);
 3632 out:
 3633         if (gotseq_ok != 0) {
 3634                 rep = m_copym(nd->nd_mreq, 0, M_COPYALL, M_WAITOK);
 3635                 NFSLOCKCLSTATE();
 3636                 clp = nfscl_getclntsess(sessionid);
 3637                 if (clp != NULL) {
 3638                         tsep = nfsmnt_mdssession(clp->nfsc_nmp);
 3639                         nfsv4_seqsess_cacherep(slotid, tsep->nfsess_cbslots,
 3640                             NFSERR_OK, &rep);
 3641                         NFSUNLOCKCLSTATE();
 3642                 } else {
 3643                         NFSUNLOCKCLSTATE();
 3644                         m_freem(rep);
 3645                 }
 3646         }
 3647 }
 3648 
 3649 /*
 3650  * Generate the next cbident value. Basically just increment a static value
 3651  * and then check that it isn't already in the list, if it has wrapped around.
 3652  */
 3653 static u_int32_t
 3654 nfscl_nextcbident(void)
 3655 {
 3656         struct nfsclclient *clp;
 3657         int matched;
 3658         static u_int32_t nextcbident = 0;
 3659         static int haswrapped = 0;
 3660 
 3661         nextcbident++;
 3662         if (nextcbident == 0)
 3663                 haswrapped = 1;
 3664         if (haswrapped) {
 3665                 /*
 3666                  * Search the clientid list for one already using this cbident.
 3667                  */
 3668                 do {
 3669                         matched = 0;
 3670                         NFSLOCKCLSTATE();
 3671                         LIST_FOREACH(clp, &nfsclhead, nfsc_list) {
 3672                                 if (clp->nfsc_cbident == nextcbident) {
 3673                                         matched = 1;
 3674                                         break;
 3675                                 }
 3676                         }
 3677                         NFSUNLOCKCLSTATE();
 3678                         if (matched == 1)
 3679                                 nextcbident++;
 3680                 } while (matched);
 3681         }
 3682         return (nextcbident);
 3683 }
 3684 
 3685 /*
 3686  * Get the mount point related to a given cbident or session and busy it.
 3687  */
 3688 static mount_t
 3689 nfscl_getmnt(int minorvers, uint8_t *sessionid, u_int32_t cbident,
 3690     struct nfsclclient **clpp)
 3691 {
 3692         struct nfsclclient *clp;
 3693         mount_t mp;
 3694         int error;
 3695         struct nfsclsession *tsep;
 3696 
 3697         *clpp = NULL;
 3698         NFSLOCKCLSTATE();
 3699         LIST_FOREACH(clp, &nfsclhead, nfsc_list) {
 3700                 tsep = nfsmnt_mdssession(clp->nfsc_nmp);
 3701                 if (minorvers == NFSV4_MINORVERSION) {
 3702                         if (clp->nfsc_cbident == cbident)
 3703                                 break;
 3704                 } else if (!NFSBCMP(tsep->nfsess_sessionid, sessionid,
 3705                     NFSX_V4SESSIONID))
 3706                         break;
 3707         }
 3708         if (clp == NULL) {
 3709                 NFSUNLOCKCLSTATE();
 3710                 return (NULL);
 3711         }
 3712         mp = clp->nfsc_nmp->nm_mountp;
 3713         vfs_ref(mp);
 3714         NFSUNLOCKCLSTATE();
 3715         error = vfs_busy(mp, 0);
 3716         vfs_rel(mp);
 3717         if (error != 0)
 3718                 return (NULL);
 3719         *clpp = clp;
 3720         return (mp);
 3721 }
 3722 
 3723 /*
 3724  * Get the clientid pointer related to a given cbident.
 3725  */
 3726 static struct nfsclclient *
 3727 nfscl_getclnt(u_int32_t cbident)
 3728 {
 3729         struct nfsclclient *clp;
 3730 
 3731         LIST_FOREACH(clp, &nfsclhead, nfsc_list)
 3732                 if (clp->nfsc_cbident == cbident)
 3733                         break;
 3734         return (clp);
 3735 }
 3736 
 3737 /*
 3738  * Get the clientid pointer related to a given sessionid.
 3739  */
 3740 static struct nfsclclient *
 3741 nfscl_getclntsess(uint8_t *sessionid)
 3742 {
 3743         struct nfsclclient *clp;
 3744         struct nfsclsession *tsep;
 3745 
 3746         LIST_FOREACH(clp, &nfsclhead, nfsc_list) {
 3747                 tsep = nfsmnt_mdssession(clp->nfsc_nmp);
 3748                 if (!NFSBCMP(tsep->nfsess_sessionid, sessionid,
 3749                     NFSX_V4SESSIONID))
 3750                         break;
 3751         }
 3752         return (clp);
 3753 }
 3754 
 3755 /*
 3756  * Search for a lock conflict locally on the client. A conflict occurs if
 3757  * - not same owner and overlapping byte range and at least one of them is
 3758  *   a write lock or this is an unlock.
 3759  */
 3760 static int
 3761 nfscl_localconflict(struct nfsclclient *clp, u_int8_t *fhp, int fhlen,
 3762     struct nfscllock *nlop, u_int8_t *own, struct nfscldeleg *dp,
 3763     struct nfscllock **lopp)
 3764 {
 3765         struct nfsclowner *owp;
 3766         struct nfsclopen *op;
 3767         int ret;
 3768 
 3769         if (dp != NULL) {
 3770                 ret = nfscl_checkconflict(&dp->nfsdl_lock, nlop, own, lopp);
 3771                 if (ret)
 3772                         return (ret);
 3773         }
 3774         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 3775                 LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 3776                         if (op->nfso_fhlen == fhlen &&
 3777                             !NFSBCMP(op->nfso_fh, fhp, fhlen)) {
 3778                                 ret = nfscl_checkconflict(&op->nfso_lock, nlop,
 3779                                     own, lopp);
 3780                                 if (ret)
 3781                                         return (ret);
 3782                         }
 3783                 }
 3784         }
 3785         return (0);
 3786 }
 3787 
 3788 static int
 3789 nfscl_checkconflict(struct nfscllockownerhead *lhp, struct nfscllock *nlop,
 3790     u_int8_t *own, struct nfscllock **lopp)
 3791 {
 3792         struct nfscllockowner *lp;
 3793         struct nfscllock *lop;
 3794 
 3795         LIST_FOREACH(lp, lhp, nfsl_list) {
 3796                 if (NFSBCMP(lp->nfsl_owner, own, NFSV4CL_LOCKNAMELEN)) {
 3797                         LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
 3798                                 if (lop->nfslo_first >= nlop->nfslo_end)
 3799                                         break;
 3800                                 if (lop->nfslo_end <= nlop->nfslo_first)
 3801                                         continue;
 3802                                 if (lop->nfslo_type == F_WRLCK ||
 3803                                     nlop->nfslo_type == F_WRLCK ||
 3804                                     nlop->nfslo_type == F_UNLCK) {
 3805                                         if (lopp != NULL)
 3806                                                 *lopp = lop;
 3807                                         return (NFSERR_DENIED);
 3808                                 }
 3809                         }
 3810                 }
 3811         }
 3812         return (0);
 3813 }
 3814 
 3815 /*
 3816  * Check for a local conflicting lock.
 3817  */
 3818 APPLESTATIC int
 3819 nfscl_lockt(vnode_t vp, struct nfsclclient *clp, u_int64_t off,
 3820     u_int64_t len, struct flock *fl, NFSPROC_T *p, void *id, int flags)
 3821 {
 3822         struct nfscllock *lop, nlck;
 3823         struct nfscldeleg *dp;
 3824         struct nfsnode *np;
 3825         u_int8_t own[NFSV4CL_LOCKNAMELEN];
 3826         int error;
 3827 
 3828         nlck.nfslo_type = fl->l_type;
 3829         nlck.nfslo_first = off;
 3830         if (len == NFS64BITSSET) {
 3831                 nlck.nfslo_end = NFS64BITSSET;
 3832         } else {
 3833                 nlck.nfslo_end = off + len;
 3834                 if (nlck.nfslo_end <= nlck.nfslo_first)
 3835                         return (NFSERR_INVAL);
 3836         }
 3837         np = VTONFS(vp);
 3838         nfscl_filllockowner(id, own, flags);
 3839         NFSLOCKCLSTATE();
 3840         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 3841         error = nfscl_localconflict(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len,
 3842             &nlck, own, dp, &lop);
 3843         if (error != 0) {
 3844                 fl->l_whence = SEEK_SET;
 3845                 fl->l_start = lop->nfslo_first;
 3846                 if (lop->nfslo_end == NFS64BITSSET)
 3847                         fl->l_len = 0;
 3848                 else
 3849                         fl->l_len = lop->nfslo_end - lop->nfslo_first;
 3850                 fl->l_pid = (pid_t)0;
 3851                 fl->l_type = lop->nfslo_type;
 3852                 error = -1;                     /* no RPC required */
 3853         } else if (dp != NULL && ((dp->nfsdl_flags & NFSCLDL_WRITE) ||
 3854             fl->l_type == F_RDLCK)) {
 3855                 /*
 3856                  * The delegation ensures that there isn't a conflicting
 3857                  * lock on the server, so return -1 to indicate an RPC
 3858                  * isn't required.
 3859                  */
 3860                 fl->l_type = F_UNLCK;
 3861                 error = -1;
 3862         }
 3863         NFSUNLOCKCLSTATE();
 3864         return (error);
 3865 }
 3866 
 3867 /*
 3868  * Handle Recall of a delegation.
 3869  * The clp must be exclusive locked when this is called.
 3870  */
 3871 static int
 3872 nfscl_recalldeleg(struct nfsclclient *clp, struct nfsmount *nmp,
 3873     struct nfscldeleg *dp, vnode_t vp, struct ucred *cred, NFSPROC_T *p,
 3874     int called_from_renewthread)
 3875 {
 3876         struct nfsclowner *owp, *lowp, *nowp;
 3877         struct nfsclopen *op, *lop;
 3878         struct nfscllockowner *lp;
 3879         struct nfscllock *lckp;
 3880         struct nfsnode *np;
 3881         int error = 0, ret, gotvp = 0;
 3882 
 3883         if (vp == NULL) {
 3884                 /*
 3885                  * First, get a vnode for the file. This is needed to do RPCs.
 3886                  */
 3887                 ret = nfscl_ngetreopen(nmp->nm_mountp, dp->nfsdl_fh,
 3888                     dp->nfsdl_fhlen, p, &np);
 3889                 if (ret) {
 3890                         /*
 3891                          * File isn't open, so nothing to move over to the
 3892                          * server.
 3893                          */
 3894                         return (0);
 3895                 }
 3896                 vp = NFSTOV(np);
 3897                 gotvp = 1;
 3898         } else {
 3899                 np = VTONFS(vp);
 3900         }
 3901         dp->nfsdl_flags &= ~NFSCLDL_MODTIMESET;
 3902 
 3903         /*
 3904          * Ok, if it's a write delegation, flush data to the server, so
 3905          * that close/open consistency is retained.
 3906          */
 3907         ret = 0;
 3908         NFSLOCKNODE(np);
 3909         if ((dp->nfsdl_flags & NFSCLDL_WRITE) && (np->n_flag & NMODIFIED)) {
 3910                 np->n_flag |= NDELEGRECALL;
 3911                 NFSUNLOCKNODE(np);
 3912                 ret = ncl_flush(vp, MNT_WAIT, p, 1, called_from_renewthread);
 3913                 NFSLOCKNODE(np);
 3914                 np->n_flag &= ~NDELEGRECALL;
 3915         }
 3916         NFSINVALATTRCACHE(np);
 3917         NFSUNLOCKNODE(np);
 3918         if (ret == EIO && called_from_renewthread != 0) {
 3919                 /*
 3920                  * If the flush failed with EIO for the renew thread,
 3921                  * return now, so that the dirty buffer will be flushed
 3922                  * later.
 3923                  */
 3924                 if (gotvp != 0)
 3925                         vrele(vp);
 3926                 return (ret);
 3927         }
 3928 
 3929         /*
 3930          * Now, for each openowner with opens issued locally, move them
 3931          * over to state against the server.
 3932          */
 3933         LIST_FOREACH(lowp, &dp->nfsdl_owner, nfsow_list) {
 3934                 lop = LIST_FIRST(&lowp->nfsow_open);
 3935                 if (lop != NULL) {
 3936                         if (LIST_NEXT(lop, nfso_list) != NULL)
 3937                                 panic("nfsdlg mult opens");
 3938                         /*
 3939                          * Look for the same openowner against the server.
 3940                          */
 3941                         LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
 3942                                 if (!NFSBCMP(lowp->nfsow_owner,
 3943                                     owp->nfsow_owner, NFSV4CL_LOCKNAMELEN)) {
 3944                                         newnfs_copycred(&dp->nfsdl_cred, cred);
 3945                                         ret = nfscl_moveopen(vp, clp, nmp, lop,
 3946                                             owp, dp, cred, p);
 3947                                         if (ret == NFSERR_STALECLIENTID ||
 3948                                             ret == NFSERR_STALEDONTRECOVER ||
 3949                                             ret == NFSERR_BADSESSION) {
 3950                                                 if (gotvp)
 3951                                                         vrele(vp);
 3952                                                 return (ret);
 3953                                         }
 3954                                         if (ret) {
 3955                                                 nfscl_freeopen(lop, 1);
 3956                                                 if (!error)
 3957                                                         error = ret;
 3958                                         }
 3959                                         break;
 3960                                 }
 3961                         }
 3962 
 3963                         /*
 3964                          * If no openowner found, create one and get an open
 3965                          * for it.
 3966                          */
 3967                         if (owp == NULL) {
 3968                                 MALLOC(nowp, struct nfsclowner *,
 3969                                     sizeof (struct nfsclowner), M_NFSCLOWNER,
 3970                                     M_WAITOK);
 3971                                 nfscl_newopen(clp, NULL, &owp, &nowp, &op, 
 3972                                     NULL, lowp->nfsow_owner, dp->nfsdl_fh,
 3973                                     dp->nfsdl_fhlen, NULL);
 3974                                 newnfs_copycred(&dp->nfsdl_cred, cred);
 3975                                 ret = nfscl_moveopen(vp, clp, nmp, lop,
 3976                                     owp, dp, cred, p);
 3977                                 if (ret) {
 3978                                         nfscl_freeopenowner(owp, 0);
 3979                                         if (ret == NFSERR_STALECLIENTID ||
 3980                                             ret == NFSERR_STALEDONTRECOVER ||
 3981                                             ret == NFSERR_BADSESSION) {
 3982                                                 if (gotvp)
 3983                                                         vrele(vp);
 3984                                                 return (ret);
 3985                                         }
 3986                                         if (ret) {
 3987                                                 nfscl_freeopen(lop, 1);
 3988                                                 if (!error)
 3989                                                         error = ret;
 3990                                         }
 3991                                 }
 3992                         }
 3993                 }
 3994         }
 3995 
 3996         /*
 3997          * Now, get byte range locks for any locks done locally.
 3998          */
 3999         LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
 4000                 LIST_FOREACH(lckp, &lp->nfsl_lock, nfslo_list) {
 4001                         newnfs_copycred(&dp->nfsdl_cred, cred);
 4002                         ret = nfscl_relock(vp, clp, nmp, lp, lckp, cred, p);
 4003                         if (ret == NFSERR_STALESTATEID ||
 4004                             ret == NFSERR_STALEDONTRECOVER ||
 4005                             ret == NFSERR_STALECLIENTID ||
 4006                             ret == NFSERR_BADSESSION) {
 4007                                 if (gotvp)
 4008                                         vrele(vp);
 4009                                 return (ret);
 4010                         }
 4011                         if (ret && !error)
 4012                                 error = ret;
 4013                 }
 4014         }
 4015         if (gotvp)
 4016                 vrele(vp);
 4017         return (error);
 4018 }
 4019 
 4020 /*
 4021  * Move a locally issued open over to an owner on the state list.
 4022  * SIDE EFFECT: If it needs to sleep (do an rpc), it unlocks clstate and
 4023  * returns with it unlocked.
 4024  */
 4025 static int
 4026 nfscl_moveopen(vnode_t vp, struct nfsclclient *clp, struct nfsmount *nmp,
 4027     struct nfsclopen *lop, struct nfsclowner *owp, struct nfscldeleg *dp,
 4028     struct ucred *cred, NFSPROC_T *p)
 4029 {
 4030         struct nfsclopen *op, *nop;
 4031         struct nfscldeleg *ndp;
 4032         struct nfsnode *np;
 4033         int error = 0, newone;
 4034 
 4035         /*
 4036          * First, look for an appropriate open, If found, just increment the
 4037          * opencnt in it.
 4038          */
 4039         LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
 4040                 if ((op->nfso_mode & lop->nfso_mode) == lop->nfso_mode &&
 4041                     op->nfso_fhlen == lop->nfso_fhlen &&
 4042                     !NFSBCMP(op->nfso_fh, lop->nfso_fh, op->nfso_fhlen)) {
 4043                         op->nfso_opencnt += lop->nfso_opencnt;
 4044                         nfscl_freeopen(lop, 1);
 4045                         return (0);
 4046                 }
 4047         }
 4048 
 4049         /* No appropriate open, so we have to do one against the server. */
 4050         np = VTONFS(vp);
 4051         MALLOC(nop, struct nfsclopen *, sizeof (struct nfsclopen) +
 4052             lop->nfso_fhlen - 1, M_NFSCLOPEN, M_WAITOK);
 4053         newone = 0;
 4054         nfscl_newopen(clp, NULL, &owp, NULL, &op, &nop, owp->nfsow_owner,
 4055             lop->nfso_fh, lop->nfso_fhlen, &newone);
 4056         ndp = dp;
 4057         error = nfscl_tryopen(nmp, vp, np->n_v4->n4_data, np->n_v4->n4_fhlen,
 4058             lop->nfso_fh, lop->nfso_fhlen, lop->nfso_mode, op,
 4059             NFS4NODENAME(np->n_v4), np->n_v4->n4_namelen, &ndp, 0, 0, cred, p);
 4060         if (error) {
 4061                 if (newone)
 4062                         nfscl_freeopen(op, 0);
 4063         } else {
 4064                 if (newone)
 4065                         newnfs_copyincred(cred, &op->nfso_cred);
 4066                 op->nfso_mode |= lop->nfso_mode;
 4067                 op->nfso_opencnt += lop->nfso_opencnt;
 4068                 nfscl_freeopen(lop, 1);
 4069         }
 4070         if (nop != NULL)
 4071                 FREE((caddr_t)nop, M_NFSCLOPEN);
 4072         if (ndp != NULL) {
 4073                 /*
 4074                  * What should I do with the returned delegation, since the
 4075                  * delegation is being recalled? For now, just printf and
 4076                  * through it away.
 4077                  */
 4078                 printf("Moveopen returned deleg\n");
 4079                 FREE((caddr_t)ndp, M_NFSCLDELEG);
 4080         }
 4081         return (error);
 4082 }
 4083 
 4084 /*
 4085  * Recall all delegations on this client.
 4086  */
 4087 static void
 4088 nfscl_totalrecall(struct nfsclclient *clp)
 4089 {
 4090         struct nfscldeleg *dp;
 4091 
 4092         TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
 4093                 if ((dp->nfsdl_flags & NFSCLDL_DELEGRET) == 0)
 4094                         dp->nfsdl_flags |= NFSCLDL_RECALL;
 4095         }
 4096 }
 4097 
 4098 /*
 4099  * Relock byte ranges. Called for delegation recall and state expiry.
 4100  */
 4101 static int
 4102 nfscl_relock(vnode_t vp, struct nfsclclient *clp, struct nfsmount *nmp,
 4103     struct nfscllockowner *lp, struct nfscllock *lop, struct ucred *cred,
 4104     NFSPROC_T *p)
 4105 {
 4106         struct nfscllockowner *nlp;
 4107         struct nfsfh *nfhp;
 4108         u_int64_t off, len;
 4109         u_int32_t clidrev = 0;
 4110         int error, newone, donelocally;
 4111 
 4112         off = lop->nfslo_first;
 4113         len = lop->nfslo_end - lop->nfslo_first;
 4114         error = nfscl_getbytelock(vp, off, len, lop->nfslo_type, cred, p,
 4115             clp, 1, NULL, lp->nfsl_lockflags, lp->nfsl_owner,
 4116             lp->nfsl_openowner, &nlp, &newone, &donelocally);
 4117         if (error || donelocally)
 4118                 return (error);
 4119         if (nmp->nm_clp != NULL)
 4120                 clidrev = nmp->nm_clp->nfsc_clientidrev;
 4121         else
 4122                 clidrev = 0;
 4123         nfhp = VTONFS(vp)->n_fhp;
 4124         error = nfscl_trylock(nmp, vp, nfhp->nfh_fh,
 4125             nfhp->nfh_len, nlp, newone, 0, off,
 4126             len, lop->nfslo_type, cred, p);
 4127         if (error)
 4128                 nfscl_freelockowner(nlp, 0);
 4129         return (error);
 4130 }
 4131 
 4132 /*
 4133  * Called to re-open a file. Basically get a vnode for the file handle
 4134  * and then call nfsrpc_openrpc() to do the rest.
 4135  */
 4136 static int
 4137 nfsrpc_reopen(struct nfsmount *nmp, u_int8_t *fhp, int fhlen,
 4138     u_int32_t mode, struct nfsclopen *op, struct nfscldeleg **dpp,
 4139     struct ucred *cred, NFSPROC_T *p)
 4140 {
 4141         struct nfsnode *np;
 4142         vnode_t vp;
 4143         int error;
 4144 
 4145         error = nfscl_ngetreopen(nmp->nm_mountp, fhp, fhlen, p, &np);
 4146         if (error)
 4147                 return (error);
 4148         vp = NFSTOV(np);
 4149         if (np->n_v4 != NULL) {
 4150                 error = nfscl_tryopen(nmp, vp, np->n_v4->n4_data,
 4151                     np->n_v4->n4_fhlen, fhp, fhlen, mode, op,
 4152                     NFS4NODENAME(np->n_v4), np->n_v4->n4_namelen, dpp, 0, 0,
 4153                     cred, p);
 4154         } else {
 4155                 error = EINVAL;
 4156         }
 4157         vrele(vp);
 4158         return (error);
 4159 }
 4160 
 4161 /*
 4162  * Try an open against the server. Just call nfsrpc_openrpc(), retrying while
 4163  * NFSERR_DELAY. Also, try system credentials, if the passed in credentials
 4164  * fail.
 4165  */
 4166 static int
 4167 nfscl_tryopen(struct nfsmount *nmp, vnode_t vp, u_int8_t *fhp, int fhlen,
 4168     u_int8_t *newfhp, int newfhlen, u_int32_t mode, struct nfsclopen *op,
 4169     u_int8_t *name, int namelen, struct nfscldeleg **ndpp,
 4170     int reclaim, u_int32_t delegtype, struct ucred *cred, NFSPROC_T *p)
 4171 {
 4172         int error;
 4173 
 4174         do {
 4175                 error = nfsrpc_openrpc(nmp, vp, fhp, fhlen, newfhp, newfhlen,
 4176                     mode, op, name, namelen, ndpp, reclaim, delegtype, cred, p,
 4177                     0, 0);
 4178                 if (error == NFSERR_DELAY)
 4179                         (void) nfs_catnap(PZERO, error, "nfstryop");
 4180         } while (error == NFSERR_DELAY);
 4181         if (error == EAUTH || error == EACCES) {
 4182                 /* Try again using system credentials */
 4183                 newnfs_setroot(cred);
 4184                 do {
 4185                     error = nfsrpc_openrpc(nmp, vp, fhp, fhlen, newfhp,
 4186                         newfhlen, mode, op, name, namelen, ndpp, reclaim,
 4187                         delegtype, cred, p, 1, 0);
 4188                     if (error == NFSERR_DELAY)
 4189                         (void) nfs_catnap(PZERO, error, "nfstryop");
 4190                 } while (error == NFSERR_DELAY);
 4191         }
 4192         return (error);
 4193 }
 4194 
 4195 /*
 4196  * Try a byte range lock. Just loop on nfsrpc_lock() while it returns
 4197  * NFSERR_DELAY. Also, retry with system credentials, if the provided
 4198  * cred don't work.
 4199  */
 4200 static int
 4201 nfscl_trylock(struct nfsmount *nmp, vnode_t vp, u_int8_t *fhp,
 4202     int fhlen, struct nfscllockowner *nlp, int newone, int reclaim,
 4203     u_int64_t off, u_int64_t len, short type, struct ucred *cred, NFSPROC_T *p)
 4204 {
 4205         struct nfsrv_descript nfsd, *nd = &nfsd;
 4206         int error;
 4207 
 4208         do {
 4209                 error = nfsrpc_lock(nd, nmp, vp, fhp, fhlen, nlp, newone,
 4210                     reclaim, off, len, type, cred, p, 0);
 4211                 if (!error && nd->nd_repstat == NFSERR_DELAY)
 4212                         (void) nfs_catnap(PZERO, (int)nd->nd_repstat,
 4213                             "nfstrylck");
 4214         } while (!error && nd->nd_repstat == NFSERR_DELAY);
 4215         if (!error)
 4216                 error = nd->nd_repstat;
 4217         if (error == EAUTH || error == EACCES) {
 4218                 /* Try again using root credentials */
 4219                 newnfs_setroot(cred);
 4220                 do {
 4221                         error = nfsrpc_lock(nd, nmp, vp, fhp, fhlen, nlp,
 4222                             newone, reclaim, off, len, type, cred, p, 1);
 4223                         if (!error && nd->nd_repstat == NFSERR_DELAY)
 4224                                 (void) nfs_catnap(PZERO, (int)nd->nd_repstat,
 4225                                     "nfstrylck");
 4226                 } while (!error && nd->nd_repstat == NFSERR_DELAY);
 4227                 if (!error)
 4228                         error = nd->nd_repstat;
 4229         }
 4230         return (error);
 4231 }
 4232 
 4233 /*
 4234  * Try a delegreturn against the server. Just call nfsrpc_delegreturn(),
 4235  * retrying while NFSERR_DELAY. Also, try system credentials, if the passed in
 4236  * credentials fail.
 4237  */
 4238 static int
 4239 nfscl_trydelegreturn(struct nfscldeleg *dp, struct ucred *cred,
 4240     struct nfsmount *nmp, NFSPROC_T *p)
 4241 {
 4242         int error;
 4243 
 4244         do {
 4245                 error = nfsrpc_delegreturn(dp, cred, nmp, p, 0);
 4246                 if (error == NFSERR_DELAY)
 4247                         (void) nfs_catnap(PZERO, error, "nfstrydp");
 4248         } while (error == NFSERR_DELAY);
 4249         if (error == EAUTH || error == EACCES) {
 4250                 /* Try again using system credentials */
 4251                 newnfs_setroot(cred);
 4252                 do {
 4253                         error = nfsrpc_delegreturn(dp, cred, nmp, p, 1);
 4254                         if (error == NFSERR_DELAY)
 4255                                 (void) nfs_catnap(PZERO, error, "nfstrydp");
 4256                 } while (error == NFSERR_DELAY);
 4257         }
 4258         return (error);
 4259 }
 4260 
 4261 /*
 4262  * Try a close against the server. Just call nfsrpc_closerpc(),
 4263  * retrying while NFSERR_DELAY. Also, try system credentials, if the passed in
 4264  * credentials fail.
 4265  */
 4266 APPLESTATIC int
 4267 nfscl_tryclose(struct nfsclopen *op, struct ucred *cred,
 4268     struct nfsmount *nmp, NFSPROC_T *p)
 4269 {
 4270         struct nfsrv_descript nfsd, *nd = &nfsd;
 4271         int error;
 4272 
 4273         do {
 4274                 error = nfsrpc_closerpc(nd, nmp, op, cred, p, 0);
 4275                 if (error == NFSERR_DELAY)
 4276                         (void) nfs_catnap(PZERO, error, "nfstrycl");
 4277         } while (error == NFSERR_DELAY);
 4278         if (error == EAUTH || error == EACCES) {
 4279                 /* Try again using system credentials */
 4280                 newnfs_setroot(cred);
 4281                 do {
 4282                         error = nfsrpc_closerpc(nd, nmp, op, cred, p, 1);
 4283                         if (error == NFSERR_DELAY)
 4284                                 (void) nfs_catnap(PZERO, error, "nfstrycl");
 4285                 } while (error == NFSERR_DELAY);
 4286         }
 4287         return (error);
 4288 }
 4289 
 4290 /*
 4291  * Decide if a delegation on a file permits close without flushing writes
 4292  * to the server. This might be a big performance win in some environments.
 4293  * (Not useful until the client does caching on local stable storage.)
 4294  */
 4295 APPLESTATIC int
 4296 nfscl_mustflush(vnode_t vp)
 4297 {
 4298         struct nfsclclient *clp;
 4299         struct nfscldeleg *dp;
 4300         struct nfsnode *np;
 4301         struct nfsmount *nmp;
 4302 
 4303         np = VTONFS(vp);
 4304         nmp = VFSTONFS(vnode_mount(vp));
 4305         if (!NFSHASNFSV4(nmp))
 4306                 return (1);
 4307         NFSLOCKCLSTATE();
 4308         clp = nfscl_findcl(nmp);
 4309         if (clp == NULL) {
 4310                 NFSUNLOCKCLSTATE();
 4311                 return (1);
 4312         }
 4313         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 4314         if (dp != NULL && (dp->nfsdl_flags &
 4315             (NFSCLDL_WRITE | NFSCLDL_RECALL | NFSCLDL_DELEGRET)) ==
 4316              NFSCLDL_WRITE &&
 4317             (dp->nfsdl_sizelimit >= np->n_size ||
 4318              !NFSHASSTRICT3530(nmp))) {
 4319                 NFSUNLOCKCLSTATE();
 4320                 return (0);
 4321         }
 4322         NFSUNLOCKCLSTATE();
 4323         return (1);
 4324 }
 4325 
 4326 /*
 4327  * See if a (write) delegation exists for this file.
 4328  */
 4329 APPLESTATIC int
 4330 nfscl_nodeleg(vnode_t vp, int writedeleg)
 4331 {
 4332         struct nfsclclient *clp;
 4333         struct nfscldeleg *dp;
 4334         struct nfsnode *np;
 4335         struct nfsmount *nmp;
 4336 
 4337         np = VTONFS(vp);
 4338         nmp = VFSTONFS(vnode_mount(vp));
 4339         if (!NFSHASNFSV4(nmp))
 4340                 return (1);
 4341         NFSLOCKCLSTATE();
 4342         clp = nfscl_findcl(nmp);
 4343         if (clp == NULL) {
 4344                 NFSUNLOCKCLSTATE();
 4345                 return (1);
 4346         }
 4347         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 4348         if (dp != NULL &&
 4349             (dp->nfsdl_flags & (NFSCLDL_RECALL | NFSCLDL_DELEGRET)) == 0 &&
 4350             (writedeleg == 0 || (dp->nfsdl_flags & NFSCLDL_WRITE) ==
 4351              NFSCLDL_WRITE)) {
 4352                 NFSUNLOCKCLSTATE();
 4353                 return (0);
 4354         }
 4355         NFSUNLOCKCLSTATE();
 4356         return (1);
 4357 }
 4358 
 4359 /*
 4360  * Look for an associated delegation that should be DelegReturned.
 4361  */
 4362 APPLESTATIC int
 4363 nfscl_removedeleg(vnode_t vp, NFSPROC_T *p, nfsv4stateid_t *stp)
 4364 {
 4365         struct nfsclclient *clp;
 4366         struct nfscldeleg *dp;
 4367         struct nfsclowner *owp;
 4368         struct nfscllockowner *lp;
 4369         struct nfsmount *nmp;
 4370         struct ucred *cred;
 4371         struct nfsnode *np;
 4372         int igotlock = 0, triedrecall = 0, needsrecall, retcnt = 0, islept;
 4373 
 4374         nmp = VFSTONFS(vnode_mount(vp));
 4375         np = VTONFS(vp);
 4376         NFSLOCKCLSTATE();
 4377         /*
 4378          * Loop around waiting for:
 4379          * - outstanding I/O operations on delegations to complete
 4380          * - for a delegation on vp that has state, lock the client and
 4381          *   do a recall
 4382          * - return delegation with no state
 4383          */
 4384         while (1) {
 4385                 clp = nfscl_findcl(nmp);
 4386                 if (clp == NULL) {
 4387                         NFSUNLOCKCLSTATE();
 4388                         return (retcnt);
 4389                 }
 4390                 dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh,
 4391                     np->n_fhp->nfh_len);
 4392                 if (dp != NULL) {
 4393                     /*
 4394                      * Wait for outstanding I/O ops to be done.
 4395                      */
 4396                     if (dp->nfsdl_rwlock.nfslock_usecnt > 0) {
 4397                         if (igotlock) {
 4398                             nfsv4_unlock(&clp->nfsc_lock, 0);
 4399                             igotlock = 0;
 4400                         }
 4401                         dp->nfsdl_rwlock.nfslock_lock |= NFSV4LOCK_WANTED;
 4402                         (void) nfsmsleep(&dp->nfsdl_rwlock,
 4403                             NFSCLSTATEMUTEXPTR, PZERO, "nfscld", NULL);
 4404                         continue;
 4405                     }
 4406                     needsrecall = 0;
 4407                     LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
 4408                         if (!LIST_EMPTY(&owp->nfsow_open)) {
 4409                             needsrecall = 1;
 4410                             break;
 4411                         }
 4412                     }
 4413                     if (!needsrecall) {
 4414                         LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
 4415                             if (!LIST_EMPTY(&lp->nfsl_lock)) {
 4416                                 needsrecall = 1;
 4417                                 break;
 4418                             }
 4419                         }
 4420                     }
 4421                     if (needsrecall && !triedrecall) {
 4422                         dp->nfsdl_flags |= NFSCLDL_DELEGRET;
 4423                         islept = 0;
 4424                         while (!igotlock) {
 4425                             igotlock = nfsv4_lock(&clp->nfsc_lock, 1,
 4426                                 &islept, NFSCLSTATEMUTEXPTR, NULL);
 4427                             if (islept)
 4428                                 break;
 4429                         }
 4430                         if (islept)
 4431                             continue;
 4432                         NFSUNLOCKCLSTATE();
 4433                         cred = newnfs_getcred();
 4434                         newnfs_copycred(&dp->nfsdl_cred, cred);
 4435                         (void) nfscl_recalldeleg(clp, nmp, dp, vp, cred, p, 0);
 4436                         NFSFREECRED(cred);
 4437                         triedrecall = 1;
 4438                         NFSLOCKCLSTATE();
 4439                         nfsv4_unlock(&clp->nfsc_lock, 0);
 4440                         igotlock = 0;
 4441                         continue;
 4442                     }
 4443                     *stp = dp->nfsdl_stateid;
 4444                     retcnt = 1;
 4445                     nfscl_cleandeleg(dp);
 4446                     nfscl_freedeleg(&clp->nfsc_deleg, dp);
 4447                 }
 4448                 if (igotlock)
 4449                     nfsv4_unlock(&clp->nfsc_lock, 0);
 4450                 NFSUNLOCKCLSTATE();
 4451                 return (retcnt);
 4452         }
 4453 }
 4454 
 4455 /*
 4456  * Look for associated delegation(s) that should be DelegReturned.
 4457  */
 4458 APPLESTATIC int
 4459 nfscl_renamedeleg(vnode_t fvp, nfsv4stateid_t *fstp, int *gotfdp, vnode_t tvp,
 4460     nfsv4stateid_t *tstp, int *gottdp, NFSPROC_T *p)
 4461 {
 4462         struct nfsclclient *clp;
 4463         struct nfscldeleg *dp;
 4464         struct nfsclowner *owp;
 4465         struct nfscllockowner *lp;
 4466         struct nfsmount *nmp;
 4467         struct ucred *cred;
 4468         struct nfsnode *np;
 4469         int igotlock = 0, triedrecall = 0, needsrecall, retcnt = 0, islept;
 4470 
 4471         nmp = VFSTONFS(vnode_mount(fvp));
 4472         *gotfdp = 0;
 4473         *gottdp = 0;
 4474         NFSLOCKCLSTATE();
 4475         /*
 4476          * Loop around waiting for:
 4477          * - outstanding I/O operations on delegations to complete
 4478          * - for a delegation on fvp that has state, lock the client and
 4479          *   do a recall
 4480          * - return delegation(s) with no state.
 4481          */
 4482         while (1) {
 4483                 clp = nfscl_findcl(nmp);
 4484                 if (clp == NULL) {
 4485                         NFSUNLOCKCLSTATE();
 4486                         return (retcnt);
 4487                 }
 4488                 np = VTONFS(fvp);
 4489                 dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh,
 4490                     np->n_fhp->nfh_len);
 4491                 if (dp != NULL && *gotfdp == 0) {
 4492                     /*
 4493                      * Wait for outstanding I/O ops to be done.
 4494                      */
 4495                     if (dp->nfsdl_rwlock.nfslock_usecnt > 0) {
 4496                         if (igotlock) {
 4497                             nfsv4_unlock(&clp->nfsc_lock, 0);
 4498                             igotlock = 0;
 4499                         }
 4500                         dp->nfsdl_rwlock.nfslock_lock |= NFSV4LOCK_WANTED;
 4501                         (void) nfsmsleep(&dp->nfsdl_rwlock,
 4502                             NFSCLSTATEMUTEXPTR, PZERO, "nfscld", NULL);
 4503                         continue;
 4504                     }
 4505                     needsrecall = 0;
 4506                     LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
 4507                         if (!LIST_EMPTY(&owp->nfsow_open)) {
 4508                             needsrecall = 1;
 4509                             break;
 4510                         }
 4511                     }
 4512                     if (!needsrecall) {
 4513                         LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
 4514                             if (!LIST_EMPTY(&lp->nfsl_lock)) {
 4515                                 needsrecall = 1;
 4516                                 break;
 4517                             }
 4518                         }
 4519                     }
 4520                     if (needsrecall && !triedrecall) {
 4521                         dp->nfsdl_flags |= NFSCLDL_DELEGRET;
 4522                         islept = 0;
 4523                         while (!igotlock) {
 4524                             igotlock = nfsv4_lock(&clp->nfsc_lock, 1,
 4525                                 &islept, NFSCLSTATEMUTEXPTR, NULL);
 4526                             if (islept)
 4527                                 break;
 4528                         }
 4529                         if (islept)
 4530                             continue;
 4531                         NFSUNLOCKCLSTATE();
 4532                         cred = newnfs_getcred();
 4533                         newnfs_copycred(&dp->nfsdl_cred, cred);
 4534                         (void) nfscl_recalldeleg(clp, nmp, dp, fvp, cred, p, 0);
 4535                         NFSFREECRED(cred);
 4536                         triedrecall = 1;
 4537                         NFSLOCKCLSTATE();
 4538                         nfsv4_unlock(&clp->nfsc_lock, 0);
 4539                         igotlock = 0;
 4540                         continue;
 4541                     }
 4542                     *fstp = dp->nfsdl_stateid;
 4543                     retcnt++;
 4544                     *gotfdp = 1;
 4545                     nfscl_cleandeleg(dp);
 4546                     nfscl_freedeleg(&clp->nfsc_deleg, dp);
 4547                 }
 4548                 if (igotlock) {
 4549                     nfsv4_unlock(&clp->nfsc_lock, 0);
 4550                     igotlock = 0;
 4551                 }
 4552                 if (tvp != NULL) {
 4553                     np = VTONFS(tvp);
 4554                     dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh,
 4555                         np->n_fhp->nfh_len);
 4556                     if (dp != NULL && *gottdp == 0) {
 4557                         /*
 4558                          * Wait for outstanding I/O ops to be done.
 4559                          */
 4560                         if (dp->nfsdl_rwlock.nfslock_usecnt > 0) {
 4561                             dp->nfsdl_rwlock.nfslock_lock |= NFSV4LOCK_WANTED;
 4562                             (void) nfsmsleep(&dp->nfsdl_rwlock,
 4563                                 NFSCLSTATEMUTEXPTR, PZERO, "nfscld", NULL);
 4564                             continue;
 4565                         }
 4566                         LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
 4567                             if (!LIST_EMPTY(&owp->nfsow_open)) {
 4568                                 NFSUNLOCKCLSTATE();
 4569                                 return (retcnt);
 4570                             }
 4571                         }
 4572                         LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
 4573                             if (!LIST_EMPTY(&lp->nfsl_lock)) {
 4574                                 NFSUNLOCKCLSTATE();
 4575                                 return (retcnt);
 4576                             }
 4577                         }
 4578                         *tstp = dp->nfsdl_stateid;
 4579                         retcnt++;
 4580                         *gottdp = 1;
 4581                         nfscl_cleandeleg(dp);
 4582                         nfscl_freedeleg(&clp->nfsc_deleg, dp);
 4583                     }
 4584                 }
 4585                 NFSUNLOCKCLSTATE();
 4586                 return (retcnt);
 4587         }
 4588 }
 4589 
 4590 /*
 4591  * Get a reference on the clientid associated with the mount point.
 4592  * Return 1 if success, 0 otherwise.
 4593  */
 4594 APPLESTATIC int
 4595 nfscl_getref(struct nfsmount *nmp)
 4596 {
 4597         struct nfsclclient *clp;
 4598 
 4599         NFSLOCKCLSTATE();
 4600         clp = nfscl_findcl(nmp);
 4601         if (clp == NULL) {
 4602                 NFSUNLOCKCLSTATE();
 4603                 return (0);
 4604         }
 4605         nfsv4_getref(&clp->nfsc_lock, NULL, NFSCLSTATEMUTEXPTR, NULL);
 4606         NFSUNLOCKCLSTATE();
 4607         return (1);
 4608 }
 4609 
 4610 /*
 4611  * Release a reference on a clientid acquired with the above call.
 4612  */
 4613 APPLESTATIC void
 4614 nfscl_relref(struct nfsmount *nmp)
 4615 {
 4616         struct nfsclclient *clp;
 4617 
 4618         NFSLOCKCLSTATE();
 4619         clp = nfscl_findcl(nmp);
 4620         if (clp == NULL) {
 4621                 NFSUNLOCKCLSTATE();
 4622                 return;
 4623         }
 4624         nfsv4_relref(&clp->nfsc_lock);
 4625         NFSUNLOCKCLSTATE();
 4626 }
 4627 
 4628 /*
 4629  * Save the size attribute in the delegation, since the nfsnode
 4630  * is going away.
 4631  */
 4632 APPLESTATIC void
 4633 nfscl_reclaimnode(vnode_t vp)
 4634 {
 4635         struct nfsclclient *clp;
 4636         struct nfscldeleg *dp;
 4637         struct nfsnode *np = VTONFS(vp);
 4638         struct nfsmount *nmp;
 4639 
 4640         nmp = VFSTONFS(vnode_mount(vp));
 4641         if (!NFSHASNFSV4(nmp))
 4642                 return;
 4643         NFSLOCKCLSTATE();
 4644         clp = nfscl_findcl(nmp);
 4645         if (clp == NULL) {
 4646                 NFSUNLOCKCLSTATE();
 4647                 return;
 4648         }
 4649         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 4650         if (dp != NULL && (dp->nfsdl_flags & NFSCLDL_WRITE))
 4651                 dp->nfsdl_size = np->n_size;
 4652         NFSUNLOCKCLSTATE();
 4653 }
 4654 
 4655 /*
 4656  * Get the saved size attribute in the delegation, since it is a
 4657  * newly allocated nfsnode.
 4658  */
 4659 APPLESTATIC void
 4660 nfscl_newnode(vnode_t vp)
 4661 {
 4662         struct nfsclclient *clp;
 4663         struct nfscldeleg *dp;
 4664         struct nfsnode *np = VTONFS(vp);
 4665         struct nfsmount *nmp;
 4666 
 4667         nmp = VFSTONFS(vnode_mount(vp));
 4668         if (!NFSHASNFSV4(nmp))
 4669                 return;
 4670         NFSLOCKCLSTATE();
 4671         clp = nfscl_findcl(nmp);
 4672         if (clp == NULL) {
 4673                 NFSUNLOCKCLSTATE();
 4674                 return;
 4675         }
 4676         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 4677         if (dp != NULL && (dp->nfsdl_flags & NFSCLDL_WRITE))
 4678                 np->n_size = dp->nfsdl_size;
 4679         NFSUNLOCKCLSTATE();
 4680 }
 4681 
 4682 /*
 4683  * If there is a valid write delegation for this file, set the modtime
 4684  * to the local clock time.
 4685  */
 4686 APPLESTATIC void
 4687 nfscl_delegmodtime(vnode_t vp)
 4688 {
 4689         struct nfsclclient *clp;
 4690         struct nfscldeleg *dp;
 4691         struct nfsnode *np = VTONFS(vp);
 4692         struct nfsmount *nmp;
 4693 
 4694         nmp = VFSTONFS(vnode_mount(vp));
 4695         if (!NFSHASNFSV4(nmp))
 4696                 return;
 4697         NFSLOCKCLSTATE();
 4698         clp = nfscl_findcl(nmp);
 4699         if (clp == NULL) {
 4700                 NFSUNLOCKCLSTATE();
 4701                 return;
 4702         }
 4703         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 4704         if (dp != NULL && (dp->nfsdl_flags & NFSCLDL_WRITE)) {
 4705                 nanotime(&dp->nfsdl_modtime);
 4706                 dp->nfsdl_flags |= NFSCLDL_MODTIMESET;
 4707         }
 4708         NFSUNLOCKCLSTATE();
 4709 }
 4710 
 4711 /*
 4712  * If there is a valid write delegation for this file with a modtime set,
 4713  * put that modtime in mtime.
 4714  */
 4715 APPLESTATIC void
 4716 nfscl_deleggetmodtime(vnode_t vp, struct timespec *mtime)
 4717 {
 4718         struct nfsclclient *clp;
 4719         struct nfscldeleg *dp;
 4720         struct nfsnode *np = VTONFS(vp);
 4721         struct nfsmount *nmp;
 4722 
 4723         nmp = VFSTONFS(vnode_mount(vp));
 4724         if (!NFSHASNFSV4(nmp))
 4725                 return;
 4726         NFSLOCKCLSTATE();
 4727         clp = nfscl_findcl(nmp);
 4728         if (clp == NULL) {
 4729                 NFSUNLOCKCLSTATE();
 4730                 return;
 4731         }
 4732         dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 4733         if (dp != NULL &&
 4734             (dp->nfsdl_flags & (NFSCLDL_WRITE | NFSCLDL_MODTIMESET)) ==
 4735             (NFSCLDL_WRITE | NFSCLDL_MODTIMESET))
 4736                 *mtime = dp->nfsdl_modtime;
 4737         NFSUNLOCKCLSTATE();
 4738 }
 4739 
 4740 static int
 4741 nfscl_errmap(struct nfsrv_descript *nd, u_int32_t minorvers)
 4742 {
 4743         short *defaulterrp, *errp;
 4744 
 4745         if (!nd->nd_repstat)
 4746                 return (0);
 4747         if (nd->nd_procnum == NFSPROC_NOOP)
 4748                 return (txdr_unsigned(nd->nd_repstat & 0xffff));
 4749         if (nd->nd_repstat == EBADRPC)
 4750                 return (txdr_unsigned(NFSERR_BADXDR));
 4751         if (nd->nd_repstat == NFSERR_MINORVERMISMATCH ||
 4752             nd->nd_repstat == NFSERR_OPILLEGAL)
 4753                 return (txdr_unsigned(nd->nd_repstat));
 4754         if (nd->nd_repstat >= NFSERR_BADIOMODE && nd->nd_repstat < 20000 &&
 4755             minorvers > NFSV4_MINORVERSION) {
 4756                 /* NFSv4.n error. */
 4757                 return (txdr_unsigned(nd->nd_repstat));
 4758         }
 4759         if (nd->nd_procnum < NFSV4OP_CBNOPS)
 4760                 errp = defaulterrp = nfscl_cberrmap[nd->nd_procnum];
 4761         else
 4762                 return (txdr_unsigned(nd->nd_repstat));
 4763         while (*++errp)
 4764                 if (*errp == (short)nd->nd_repstat)
 4765                         return (txdr_unsigned(nd->nd_repstat));
 4766         return (txdr_unsigned(*defaulterrp));
 4767 }
 4768 
 4769 /*
 4770  * Called to find/add a layout to a client.
 4771  * This function returns the layout with a refcnt (shared lock) upon
 4772  * success (returns 0) or with no lock/refcnt on the layout when an
 4773  * error is returned.
 4774  * If a layout is passed in via lypp, it is locked (exclusively locked).
 4775  */
 4776 APPLESTATIC int
 4777 nfscl_layout(struct nfsmount *nmp, vnode_t vp, u_int8_t *fhp, int fhlen,
 4778     nfsv4stateid_t *stateidp, int retonclose,
 4779     struct nfsclflayouthead *fhlp, struct nfscllayout **lypp,
 4780     struct ucred *cred, NFSPROC_T *p)
 4781 {
 4782         struct nfsclclient *clp;
 4783         struct nfscllayout *lyp, *tlyp;
 4784         struct nfsclflayout *flp;
 4785         struct nfsnode *np = VTONFS(vp);
 4786         mount_t mp;
 4787         int layout_passed_in;
 4788 
 4789         mp = nmp->nm_mountp;
 4790         layout_passed_in = 1;
 4791         tlyp = NULL;
 4792         lyp = *lypp;
 4793         if (lyp == NULL) {
 4794                 layout_passed_in = 0;
 4795                 tlyp = malloc(sizeof(*tlyp) + fhlen - 1, M_NFSLAYOUT,
 4796                     M_WAITOK | M_ZERO);
 4797         }
 4798 
 4799         NFSLOCKCLSTATE();
 4800         clp = nmp->nm_clp;
 4801         if (clp == NULL) {
 4802                 if (layout_passed_in != 0)
 4803                         nfsv4_unlock(&lyp->nfsly_lock, 0);
 4804                 NFSUNLOCKCLSTATE();
 4805                 if (tlyp != NULL)
 4806                         free(tlyp, M_NFSLAYOUT);
 4807                 return (EPERM);
 4808         }
 4809         if (lyp == NULL) {
 4810                 /*
 4811                  * Although no lyp was passed in, another thread might have
 4812                  * allocated one. If one is found, just increment it's ref
 4813                  * count and return it.
 4814                  */
 4815                 lyp = nfscl_findlayout(clp, fhp, fhlen);
 4816                 if (lyp == NULL) {
 4817                         lyp = tlyp;
 4818                         tlyp = NULL;
 4819                         lyp->nfsly_stateid.seqid = stateidp->seqid;
 4820                         lyp->nfsly_stateid.other[0] = stateidp->other[0];
 4821                         lyp->nfsly_stateid.other[1] = stateidp->other[1];
 4822                         lyp->nfsly_stateid.other[2] = stateidp->other[2];
 4823                         lyp->nfsly_lastbyte = 0;
 4824                         LIST_INIT(&lyp->nfsly_flayread);
 4825                         LIST_INIT(&lyp->nfsly_flayrw);
 4826                         LIST_INIT(&lyp->nfsly_recall);
 4827                         lyp->nfsly_filesid[0] = np->n_vattr.na_filesid[0];
 4828                         lyp->nfsly_filesid[1] = np->n_vattr.na_filesid[1];
 4829                         lyp->nfsly_clp = clp;
 4830                         lyp->nfsly_flags = (retonclose != 0) ?
 4831                             (NFSLY_FILES | NFSLY_RETONCLOSE) : NFSLY_FILES;
 4832                         lyp->nfsly_fhlen = fhlen;
 4833                         NFSBCOPY(fhp, lyp->nfsly_fh, fhlen);
 4834                         TAILQ_INSERT_HEAD(&clp->nfsc_layout, lyp, nfsly_list);
 4835                         LIST_INSERT_HEAD(NFSCLLAYOUTHASH(clp, fhp, fhlen), lyp,
 4836                             nfsly_hash);
 4837                         lyp->nfsly_timestamp = NFSD_MONOSEC + 120;
 4838                         nfscl_layoutcnt++;
 4839                 } else {
 4840                         if (retonclose != 0)
 4841                                 lyp->nfsly_flags |= NFSLY_RETONCLOSE;
 4842                         TAILQ_REMOVE(&clp->nfsc_layout, lyp, nfsly_list);
 4843                         TAILQ_INSERT_HEAD(&clp->nfsc_layout, lyp, nfsly_list);
 4844                         lyp->nfsly_timestamp = NFSD_MONOSEC + 120;
 4845                 }
 4846                 nfsv4_getref(&lyp->nfsly_lock, NULL, NFSCLSTATEMUTEXPTR, mp);
 4847                 if ((mp->mnt_kern_flag & MNTK_UNMOUNTF) != 0) {
 4848                         NFSUNLOCKCLSTATE();
 4849                         if (tlyp != NULL)
 4850                                 free(tlyp, M_NFSLAYOUT);
 4851                         return (EPERM);
 4852                 }
 4853                 *lypp = lyp;
 4854         } else
 4855                 lyp->nfsly_stateid.seqid = stateidp->seqid;
 4856 
 4857         /* Merge the new list of File Layouts into the list. */
 4858         flp = LIST_FIRST(fhlp);
 4859         if (flp != NULL) {
 4860                 if (flp->nfsfl_iomode == NFSLAYOUTIOMODE_READ)
 4861                         nfscl_mergeflayouts(&lyp->nfsly_flayread, fhlp);
 4862                 else
 4863                         nfscl_mergeflayouts(&lyp->nfsly_flayrw, fhlp);
 4864         }
 4865         if (layout_passed_in != 0)
 4866                 nfsv4_unlock(&lyp->nfsly_lock, 1);
 4867         NFSUNLOCKCLSTATE();
 4868         if (tlyp != NULL)
 4869                 free(tlyp, M_NFSLAYOUT);
 4870         return (0);
 4871 }
 4872 
 4873 /*
 4874  * Search for a layout by MDS file handle.
 4875  * If one is found, it is returned with a refcnt (shared lock) iff
 4876  * retflpp returned non-NULL and locked (exclusive locked) iff retflpp is
 4877  * returned NULL.
 4878  */
 4879 struct nfscllayout *
 4880 nfscl_getlayout(struct nfsclclient *clp, uint8_t *fhp, int fhlen,
 4881     uint64_t off, struct nfsclflayout **retflpp, int *recalledp)
 4882 {
 4883         struct nfscllayout *lyp;
 4884         mount_t mp;
 4885         int error, igotlock;
 4886 
 4887         mp = clp->nfsc_nmp->nm_mountp;
 4888         *recalledp = 0;
 4889         *retflpp = NULL;
 4890         NFSLOCKCLSTATE();
 4891         lyp = nfscl_findlayout(clp, fhp, fhlen);
 4892         if (lyp != NULL) {
 4893                 if ((lyp->nfsly_flags & NFSLY_RECALL) == 0) {
 4894                         TAILQ_REMOVE(&clp->nfsc_layout, lyp, nfsly_list);
 4895                         TAILQ_INSERT_HEAD(&clp->nfsc_layout, lyp, nfsly_list);
 4896                         lyp->nfsly_timestamp = NFSD_MONOSEC + 120;
 4897                         error = nfscl_findlayoutforio(lyp, off,
 4898                             NFSV4OPEN_ACCESSREAD, retflpp);
 4899                         if (error == 0)
 4900                                 nfsv4_getref(&lyp->nfsly_lock, NULL,
 4901                                     NFSCLSTATEMUTEXPTR, mp);
 4902                         else {
 4903                                 do {
 4904                                         igotlock = nfsv4_lock(&lyp->nfsly_lock,
 4905                                             1, NULL, NFSCLSTATEMUTEXPTR, mp);
 4906                                 } while (igotlock == 0 &&
 4907                                     (mp->mnt_kern_flag & MNTK_UNMOUNTF) == 0);
 4908                                 *retflpp = NULL;
 4909                         }
 4910                         if ((mp->mnt_kern_flag & MNTK_UNMOUNTF) != 0) {
 4911                                 lyp = NULL;
 4912                                 *recalledp = 1;
 4913                         }
 4914                 } else {
 4915                         lyp = NULL;
 4916                         *recalledp = 1;
 4917                 }
 4918         }
 4919         NFSUNLOCKCLSTATE();
 4920         return (lyp);
 4921 }
 4922 
 4923 /*
 4924  * Search for a layout by MDS file handle. If one is found, mark in to be
 4925  * recalled, if it already marked "return on close".
 4926  */
 4927 static void
 4928 nfscl_retoncloselayout(vnode_t vp, struct nfsclclient *clp, uint8_t *fhp,
 4929     int fhlen, struct nfsclrecalllayout **recallpp)
 4930 {
 4931         struct nfscllayout *lyp;
 4932         uint32_t iomode;
 4933 
 4934         if (vp->v_type != VREG || !NFSHASPNFS(VFSTONFS(vnode_mount(vp))) ||
 4935             nfscl_enablecallb == 0 || nfs_numnfscbd == 0 ||
 4936             (VTONFS(vp)->n_flag & NNOLAYOUT) != 0)
 4937                 return;
 4938         lyp = nfscl_findlayout(clp, fhp, fhlen);
 4939         if (lyp != NULL && (lyp->nfsly_flags & (NFSLY_RETONCLOSE |
 4940             NFSLY_RECALL)) == NFSLY_RETONCLOSE) {
 4941                 iomode = 0;
 4942                 if (!LIST_EMPTY(&lyp->nfsly_flayread))
 4943                         iomode |= NFSLAYOUTIOMODE_READ;
 4944                 if (!LIST_EMPTY(&lyp->nfsly_flayrw))
 4945                         iomode |= NFSLAYOUTIOMODE_RW;
 4946                 (void)nfscl_layoutrecall(NFSLAYOUTRETURN_FILE, lyp, iomode,
 4947                     0, UINT64_MAX, lyp->nfsly_stateid.seqid, *recallpp);
 4948                 NFSCL_DEBUG(4, "retoncls recall iomode=%d\n", iomode);
 4949                 *recallpp = NULL;
 4950         }
 4951 }
 4952 
 4953 /*
 4954  * Dereference a layout.
 4955  */
 4956 void
 4957 nfscl_rellayout(struct nfscllayout *lyp, int exclocked)
 4958 {
 4959 
 4960         NFSLOCKCLSTATE();
 4961         if (exclocked != 0)
 4962                 nfsv4_unlock(&lyp->nfsly_lock, 0);
 4963         else
 4964                 nfsv4_relref(&lyp->nfsly_lock);
 4965         NFSUNLOCKCLSTATE();
 4966 }
 4967 
 4968 /*
 4969  * Search for a devinfo by deviceid. If one is found, return it after
 4970  * acquiring a reference count on it.
 4971  */
 4972 struct nfscldevinfo *
 4973 nfscl_getdevinfo(struct nfsclclient *clp, uint8_t *deviceid,
 4974     struct nfscldevinfo *dip)
 4975 {
 4976 
 4977         NFSLOCKCLSTATE();
 4978         if (dip == NULL)
 4979                 dip = nfscl_finddevinfo(clp, deviceid);
 4980         if (dip != NULL)
 4981                 dip->nfsdi_refcnt++;
 4982         NFSUNLOCKCLSTATE();
 4983         return (dip);
 4984 }
 4985 
 4986 /*
 4987  * Dereference a devinfo structure.
 4988  */
 4989 static void
 4990 nfscl_reldevinfo_locked(struct nfscldevinfo *dip)
 4991 {
 4992 
 4993         dip->nfsdi_refcnt--;
 4994         if (dip->nfsdi_refcnt == 0)
 4995                 wakeup(&dip->nfsdi_refcnt);
 4996 }
 4997 
 4998 /*
 4999  * Dereference a devinfo structure.
 5000  */
 5001 void
 5002 nfscl_reldevinfo(struct nfscldevinfo *dip)
 5003 {
 5004 
 5005         NFSLOCKCLSTATE();
 5006         nfscl_reldevinfo_locked(dip);
 5007         NFSUNLOCKCLSTATE();
 5008 }
 5009 
 5010 /*
 5011  * Find a layout for this file handle. Return NULL upon failure.
 5012  */
 5013 static struct nfscllayout *
 5014 nfscl_findlayout(struct nfsclclient *clp, u_int8_t *fhp, int fhlen)
 5015 {
 5016         struct nfscllayout *lyp;
 5017 
 5018         LIST_FOREACH(lyp, NFSCLLAYOUTHASH(clp, fhp, fhlen), nfsly_hash)
 5019                 if (lyp->nfsly_fhlen == fhlen &&
 5020                     !NFSBCMP(lyp->nfsly_fh, fhp, fhlen))
 5021                         break;
 5022         return (lyp);
 5023 }
 5024 
 5025 /*
 5026  * Find a devinfo for this deviceid. Return NULL upon failure.
 5027  */
 5028 static struct nfscldevinfo *
 5029 nfscl_finddevinfo(struct nfsclclient *clp, uint8_t *deviceid)
 5030 {
 5031         struct nfscldevinfo *dip;
 5032 
 5033         LIST_FOREACH(dip, &clp->nfsc_devinfo, nfsdi_list)
 5034                 if (NFSBCMP(dip->nfsdi_deviceid, deviceid, NFSX_V4DEVICEID)
 5035                     == 0)
 5036                         break;
 5037         return (dip);
 5038 }
 5039 
 5040 /*
 5041  * Merge the new file layout list into the main one, maintaining it in
 5042  * increasing offset order.
 5043  */
 5044 static void
 5045 nfscl_mergeflayouts(struct nfsclflayouthead *fhlp,
 5046     struct nfsclflayouthead *newfhlp)
 5047 {
 5048         struct nfsclflayout *flp, *nflp, *prevflp, *tflp;
 5049 
 5050         flp = LIST_FIRST(fhlp);
 5051         prevflp = NULL;
 5052         LIST_FOREACH_SAFE(nflp, newfhlp, nfsfl_list, tflp) {
 5053                 while (flp != NULL && flp->nfsfl_off < nflp->nfsfl_off) {
 5054                         prevflp = flp;
 5055                         flp = LIST_NEXT(flp, nfsfl_list);
 5056                 }
 5057                 if (prevflp == NULL)
 5058                         LIST_INSERT_HEAD(fhlp, nflp, nfsfl_list);
 5059                 else
 5060                         LIST_INSERT_AFTER(prevflp, nflp, nfsfl_list);
 5061                 prevflp = nflp;
 5062         }
 5063 }
 5064 
 5065 /*
 5066  * Add this nfscldevinfo to the client, if it doesn't already exist.
 5067  * This function consumes the structure pointed at by dip, if not NULL.
 5068  */
 5069 APPLESTATIC int
 5070 nfscl_adddevinfo(struct nfsmount *nmp, struct nfscldevinfo *dip,
 5071     struct nfsclflayout *flp)
 5072 {
 5073         struct nfsclclient *clp;
 5074         struct nfscldevinfo *tdip;
 5075 
 5076         NFSLOCKCLSTATE();
 5077         clp = nmp->nm_clp;
 5078         if (clp == NULL) {
 5079                 NFSUNLOCKCLSTATE();
 5080                 if (dip != NULL)
 5081                         free(dip, M_NFSDEVINFO);
 5082                 return (ENODEV);
 5083         }
 5084         tdip = nfscl_finddevinfo(clp, flp->nfsfl_dev);
 5085         if (tdip != NULL) {
 5086                 tdip->nfsdi_layoutrefs++;
 5087                 flp->nfsfl_devp = tdip;
 5088                 nfscl_reldevinfo_locked(tdip);
 5089                 NFSUNLOCKCLSTATE();
 5090                 if (dip != NULL)
 5091                         free(dip, M_NFSDEVINFO);
 5092                 return (0);
 5093         }
 5094         if (dip != NULL) {
 5095                 LIST_INSERT_HEAD(&clp->nfsc_devinfo, dip, nfsdi_list);
 5096                 dip->nfsdi_layoutrefs = 1;
 5097                 flp->nfsfl_devp = dip;
 5098         }
 5099         NFSUNLOCKCLSTATE();
 5100         if (dip == NULL)
 5101                 return (ENODEV);
 5102         return (0);
 5103 }
 5104 
 5105 /*
 5106  * Free up a layout structure and associated file layout structure(s).
 5107  */
 5108 APPLESTATIC void
 5109 nfscl_freelayout(struct nfscllayout *layp)
 5110 {
 5111         struct nfsclflayout *flp, *nflp;
 5112         struct nfsclrecalllayout *rp, *nrp;
 5113 
 5114         LIST_FOREACH_SAFE(flp, &layp->nfsly_flayread, nfsfl_list, nflp) {
 5115                 LIST_REMOVE(flp, nfsfl_list);
 5116                 nfscl_freeflayout(flp);
 5117         }
 5118         LIST_FOREACH_SAFE(flp, &layp->nfsly_flayrw, nfsfl_list, nflp) {
 5119                 LIST_REMOVE(flp, nfsfl_list);
 5120                 nfscl_freeflayout(flp);
 5121         }
 5122         LIST_FOREACH_SAFE(rp, &layp->nfsly_recall, nfsrecly_list, nrp) {
 5123                 LIST_REMOVE(rp, nfsrecly_list);
 5124                 free(rp, M_NFSLAYRECALL);
 5125         }
 5126         nfscl_layoutcnt--;
 5127         free(layp, M_NFSLAYOUT);
 5128 }
 5129 
 5130 /*
 5131  * Free up a file layout structure.
 5132  */
 5133 APPLESTATIC void
 5134 nfscl_freeflayout(struct nfsclflayout *flp)
 5135 {
 5136         int i;
 5137 
 5138         for (i = 0; i < flp->nfsfl_fhcnt; i++)
 5139                 free(flp->nfsfl_fh[i], M_NFSFH);
 5140         if (flp->nfsfl_devp != NULL)
 5141                 flp->nfsfl_devp->nfsdi_layoutrefs--;
 5142         free(flp, M_NFSFLAYOUT);
 5143 }
 5144 
 5145 /*
 5146  * Free up a file layout devinfo structure.
 5147  */
 5148 APPLESTATIC void
 5149 nfscl_freedevinfo(struct nfscldevinfo *dip)
 5150 {
 5151 
 5152         free(dip, M_NFSDEVINFO);
 5153 }
 5154 
 5155 /*
 5156  * Mark any layouts that match as recalled.
 5157  */
 5158 static int
 5159 nfscl_layoutrecall(int recalltype, struct nfscllayout *lyp, uint32_t iomode,
 5160     uint64_t off, uint64_t len, uint32_t stateseqid,
 5161     struct nfsclrecalllayout *recallp)
 5162 {
 5163         struct nfsclrecalllayout *rp, *orp;
 5164 
 5165         recallp->nfsrecly_recalltype = recalltype;
 5166         recallp->nfsrecly_iomode = iomode;
 5167         recallp->nfsrecly_stateseqid = stateseqid;
 5168         recallp->nfsrecly_off = off;
 5169         recallp->nfsrecly_len = len;
 5170         /*
 5171          * Order the list as file returns first, followed by fsid and any
 5172          * returns, both in increasing stateseqid order.
 5173          * Note that the seqids wrap around, so 1 is after 0xffffffff.
 5174          * (I'm not sure this is correct because I find RFC5661 confusing
 5175          *  on this, but hopefully it will work ok.)
 5176          */
 5177         orp = NULL;
 5178         LIST_FOREACH(rp, &lyp->nfsly_recall, nfsrecly_list) {
 5179                 orp = rp;
 5180                 if ((recalltype == NFSLAYOUTRETURN_FILE &&
 5181                      (rp->nfsrecly_recalltype != NFSLAYOUTRETURN_FILE ||
 5182                       nfscl_seq(stateseqid, rp->nfsrecly_stateseqid) != 0)) ||
 5183                     (recalltype != NFSLAYOUTRETURN_FILE &&
 5184                      rp->nfsrecly_recalltype != NFSLAYOUTRETURN_FILE &&
 5185                      nfscl_seq(stateseqid, rp->nfsrecly_stateseqid) != 0)) {
 5186                         LIST_INSERT_BEFORE(rp, recallp, nfsrecly_list);
 5187                         break;
 5188                 }
 5189         }
 5190         if (rp == NULL) {
 5191                 if (orp == NULL)
 5192                         LIST_INSERT_HEAD(&lyp->nfsly_recall, recallp,
 5193                             nfsrecly_list);
 5194                 else
 5195                         LIST_INSERT_AFTER(orp, recallp, nfsrecly_list);
 5196         }
 5197         lyp->nfsly_flags |= NFSLY_RECALL;
 5198         return (0);
 5199 }
 5200 
 5201 /*
 5202  * Compare the two seqids for ordering. The trick is that the seqids can
 5203  * wrap around from 0xffffffff->0, so check for the cases where one
 5204  * has wrapped around.
 5205  * Return 1 if seqid1 comes before seqid2, 0 otherwise.
 5206  */
 5207 static int
 5208 nfscl_seq(uint32_t seqid1, uint32_t seqid2)
 5209 {
 5210 
 5211         if (seqid2 > seqid1 && (seqid2 - seqid1) >= 0x7fffffff)
 5212                 /* seqid2 has wrapped around. */
 5213                 return (0);
 5214         if (seqid1 > seqid2 && (seqid1 - seqid2) >= 0x7fffffff)
 5215                 /* seqid1 has wrapped around. */
 5216                 return (1);
 5217         if (seqid1 <= seqid2)
 5218                 return (1);
 5219         return (0);
 5220 }
 5221 
 5222 /*
 5223  * Do a layout return for each of the recalls.
 5224  */
 5225 static void
 5226 nfscl_layoutreturn(struct nfsmount *nmp, struct nfscllayout *lyp,
 5227     struct ucred *cred, NFSPROC_T *p)
 5228 {
 5229         struct nfsclrecalllayout *rp;
 5230         nfsv4stateid_t stateid;
 5231 
 5232         NFSBCOPY(lyp->nfsly_stateid.other, stateid.other, NFSX_STATEIDOTHER);
 5233         stateid.seqid = lyp->nfsly_stateid.seqid;
 5234         LIST_FOREACH(rp, &lyp->nfsly_recall, nfsrecly_list) {
 5235                 (void)nfsrpc_layoutreturn(nmp, lyp->nfsly_fh,
 5236                     lyp->nfsly_fhlen, 0, NFSLAYOUT_NFSV4_1_FILES,
 5237                     rp->nfsrecly_iomode, rp->nfsrecly_recalltype,
 5238                     rp->nfsrecly_off, rp->nfsrecly_len,
 5239                     &stateid, 0, NULL, cred, p, NULL);
 5240         }
 5241 }
 5242 
 5243 /*
 5244  * Do the layout commit for a file layout.
 5245  */
 5246 static void
 5247 nfscl_dolayoutcommit(struct nfsmount *nmp, struct nfscllayout *lyp,
 5248     struct ucred *cred, NFSPROC_T *p)
 5249 {
 5250         struct nfsclflayout *flp;
 5251         uint64_t len;
 5252         int error;
 5253 
 5254         LIST_FOREACH(flp, &lyp->nfsly_flayrw, nfsfl_list) {
 5255                 if (flp->nfsfl_off <= lyp->nfsly_lastbyte) {
 5256                         len = flp->nfsfl_end - flp->nfsfl_off;
 5257                         error = nfsrpc_layoutcommit(nmp, lyp->nfsly_fh,
 5258                             lyp->nfsly_fhlen, 0, flp->nfsfl_off, len,
 5259                             lyp->nfsly_lastbyte, &lyp->nfsly_stateid,
 5260                             NFSLAYOUT_NFSV4_1_FILES, 0, NULL, cred, p, NULL);
 5261                         NFSCL_DEBUG(4, "layoutcommit err=%d\n", error);
 5262                         if (error == NFSERR_NOTSUPP) {
 5263                                 /* If not supported, don't bother doing it. */
 5264                                 NFSLOCKMNT(nmp);
 5265                                 nmp->nm_state |= NFSSTA_NOLAYOUTCOMMIT;
 5266                                 NFSUNLOCKMNT(nmp);
 5267                                 break;
 5268                         }
 5269                 }
 5270         }
 5271 }
 5272 
 5273 /*
 5274  * Commit all layouts for a file (vnode).
 5275  */
 5276 int
 5277 nfscl_layoutcommit(vnode_t vp, NFSPROC_T *p)
 5278 {
 5279         struct nfsclclient *clp;
 5280         struct nfscllayout *lyp;
 5281         struct nfsnode *np = VTONFS(vp);
 5282         mount_t mp;
 5283         struct nfsmount *nmp;
 5284 
 5285         mp = vnode_mount(vp);
 5286         nmp = VFSTONFS(mp);
 5287         if (NFSHASNOLAYOUTCOMMIT(nmp))
 5288                 return (0);
 5289         NFSLOCKCLSTATE();
 5290         clp = nmp->nm_clp;
 5291         if (clp == NULL) {
 5292                 NFSUNLOCKCLSTATE();
 5293                 return (EPERM);
 5294         }
 5295         lyp = nfscl_findlayout(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
 5296         if (lyp == NULL) {
 5297                 NFSUNLOCKCLSTATE();
 5298                 return (EPERM);
 5299         }
 5300         nfsv4_getref(&lyp->nfsly_lock, NULL, NFSCLSTATEMUTEXPTR, mp);
 5301         if ((mp->mnt_kern_flag & MNTK_UNMOUNTF) != 0) {
 5302                 NFSUNLOCKCLSTATE();
 5303                 return (EPERM);
 5304         }
 5305 tryagain:
 5306         if ((lyp->nfsly_flags & NFSLY_WRITTEN) != 0) {
 5307                 lyp->nfsly_flags &= ~NFSLY_WRITTEN;
 5308                 NFSUNLOCKCLSTATE();
 5309                 NFSCL_DEBUG(4, "do layoutcommit2\n");
 5310                 nfscl_dolayoutcommit(clp->nfsc_nmp, lyp, NFSPROCCRED(p), p);
 5311                 NFSLOCKCLSTATE();
 5312                 goto tryagain;
 5313         }
 5314         nfsv4_relref(&lyp->nfsly_lock);
 5315         NFSUNLOCKCLSTATE();
 5316         return (0);
 5317 }
 5318 

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