fs/nfs/callback_proc.c

   1 /*
   2  * linux/fs/nfs/callback_proc.c
   3  *
   4  * Copyright (C) 2004 Trond Myklebust
   5  *
   6  * NFSv4 callback procedures
   7  */
   8 #include <linux/nfs4.h>
   9 #include <linux/nfs_fs.h>
  10 #include <linux/slab.h>
  11 #include <linux/rcupdate.h>
  12 #include "nfs4_fs.h"
  13 #include "callback.h"
  14 #include "delegation.h"
  15 #include "internal.h"
  16 #include "pnfs.h"
  17 #include "nfs4session.h"
  18 #include "nfs4trace.h"
  19
  20 #define NFSDBG_FACILITY NFSDBG_CALLBACK
  21
  22 __be32 nfs4_callback_getattr(struct cb_getattrargs *args,
  23                              struct cb_getattrres *res,
  24                              struct cb_process_state *cps)
  25 {
  26         struct nfs_delegation *delegation;
  27         struct nfs_inode *nfsi;
  28         struct inode *inode;
  29
  30         res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
  31         if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
  32                 goto out;
  33
  34         res->bitmap[0] = res->bitmap[1] = 0;
  35         res->status = htonl(NFS4ERR_BADHANDLE);
  36
  37         dprintk_rcu("NFS: GETATTR callback request from %s\n",
  38                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
  39
  40         inode = nfs_delegation_find_inode(cps->clp, &args->fh);
  41         if (inode == NULL) {
  42                 trace_nfs4_cb_getattr(cps->clp, &args->fh, NULL,
  43                                 -ntohl(res->status));
  44                 goto out;
  45         }
  46         nfsi = NFS_I(inode);
  47         rcu_read_lock();
  48         delegation = rcu_dereference(nfsi->delegation);
  49         if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)
  50                 goto out_iput;
  51         res->size = i_size_read(inode);
  52         res->change_attr = delegation->change_attr;
  53         if (nfsi->nrequests != 0)
  54                 res->change_attr++;
  55         res->ctime = inode->i_ctime;
  56         res->mtime = inode->i_mtime;
  57         res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
  58                 args->bitmap[0];
  59         res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &
  60                 args->bitmap[1];
  61         res->status = 0;
  62 out_iput:
  63         rcu_read_unlock();
  64         trace_nfs4_cb_getattr(cps->clp, &args->fh, inode, -ntohl(res->status));
  65         iput(inode);
  66 out:
  67         dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
  68         return res->status;
  69 }
  70
  71 __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy,
  72                             struct cb_process_state *cps)
  73 {
  74         struct inode *inode;
  75         __be32 res;
  76
  77         res = htonl(NFS4ERR_OP_NOT_IN_SESSION);
  78         if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
  79                 goto out;
  80
  81         dprintk_rcu("NFS: RECALL callback request from %s\n",
  82                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
  83
  84         res = htonl(NFS4ERR_BADHANDLE);
  85         inode = nfs_delegation_find_inode(cps->clp, &args->fh);
  86         if (inode == NULL) {
  87                 trace_nfs4_cb_recall(cps->clp, &args->fh, NULL,
  88                                 &args->stateid, -ntohl(res));
  89                 goto out;
  90         }
  91         /* Set up a helper thread to actually return the delegation */
  92         switch (nfs_async_inode_return_delegation(inode, &args->stateid)) {
  93         case 0:
  94                 res = 0;
  95                 break;
  96         case -ENOENT:
  97                 res = htonl(NFS4ERR_BAD_STATEID);
  98                 break;
  99         default:
 100                 res = htonl(NFS4ERR_RESOURCE);
 101         }
 102         trace_nfs4_cb_recall(cps->clp, &args->fh, inode,
 103                         &args->stateid, -ntohl(res));
 104         iput(inode);
 105 out:
 106         dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
 107         return res;
 108 }
 109
 110 #if defined(CONFIG_NFS_V4_1)
 111
 112 /*
 113  * Lookup a layout by filehandle.
 114  *
 115  * Note: gets a refcount on the layout hdr and on its respective inode.
 116  * Caller must put the layout hdr and the inode.
 117  *
 118  * TODO: keep track of all layouts (and delegations) in a hash table
 119  * hashed by filehandle.
 120  */
 121 static struct pnfs_layout_hdr * get_layout_by_fh_locked(struct nfs_client *clp,
 122                 struct nfs_fh *fh, nfs4_stateid *stateid)
 123 {
 124         struct nfs_server *server;
 125         struct inode *ino;
 126         struct pnfs_layout_hdr *lo;
 127
 128         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
 129                 list_for_each_entry(lo, &server->layouts, plh_layouts) {
 130                         if (!nfs4_stateid_match_other(&lo->plh_stateid, stateid))
 131                                 continue;
 132                         if (nfs_compare_fh(fh, &NFS_I(lo->plh_inode)->fh))
 133                                 continue;
 134                         ino = igrab(lo->plh_inode);
 135                         if (!ino)
 136                                 break;
 137                         spin_lock(&ino->i_lock);
 138                         /* Is this layout in the process of being freed? */
 139                         if (NFS_I(ino)->layout != lo) {
 140                                 spin_unlock(&ino->i_lock);
 141                                 iput(ino);
 142                                 break;
 143                         }
 144                         pnfs_get_layout_hdr(lo);
 145                         spin_unlock(&ino->i_lock);
 146                         return lo;
 147                 }
 148         }
 149
 150         return NULL;
 151 }
 152
 153 static struct pnfs_layout_hdr * get_layout_by_fh(struct nfs_client *clp,
 154                 struct nfs_fh *fh, nfs4_stateid *stateid)
 155 {
 156         struct pnfs_layout_hdr *lo;
 157
 158         spin_lock(&clp->cl_lock);
 159         rcu_read_lock();
 160         lo = get_layout_by_fh_locked(clp, fh, stateid);
 161         rcu_read_unlock();
 162         spin_unlock(&clp->cl_lock);
 163
 164         return lo;
 165 }
 166
 167 /*
 168  * Enforce RFC5661 section 12.5.5.2.1. (Layout Recall and Return Sequencing)
 169  */
 170 static bool pnfs_check_stateid_sequence(struct pnfs_layout_hdr *lo,
 171                                         const nfs4_stateid *new)
 172 {
 173         u32 oldseq, newseq;
 174
 175         oldseq = be32_to_cpu(lo->plh_stateid.seqid);
 176         newseq = be32_to_cpu(new->seqid);
 177
 178         if (newseq > oldseq + 1)
 179                 return false;
 180         return true;
 181 }
 182
 183 static u32 initiate_file_draining(struct nfs_client *clp,
 184                                   struct cb_layoutrecallargs *args)
 185 {
 186         struct inode *ino;
 187         struct pnfs_layout_hdr *lo;
 188         u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
 189         LIST_HEAD(free_me_list);
 190
 191         lo = get_layout_by_fh(clp, &args->cbl_fh, &args->cbl_stateid);
 192         if (!lo) {
 193                 trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, NULL,
 194                                 &args->cbl_stateid, -rv);
 195                 goto out;
 196         }
 197
 198         ino = lo->plh_inode;
 199
 200         spin_lock(&ino->i_lock);
 201         if (!pnfs_check_stateid_sequence(lo, &args->cbl_stateid)) {
 202                 rv = NFS4ERR_DELAY;
 203                 goto unlock;
 204         }
 205         pnfs_set_layout_stateid(lo, &args->cbl_stateid, true);
 206         spin_unlock(&ino->i_lock);
 207
 208         pnfs_layoutcommit_inode(ino, false);
 209
 210         spin_lock(&ino->i_lock);
 211         /*
 212          * Enforce RFC5661 Section 12.5.5.2.1.5 (Bulk Recall and Return)
 213          */
 214         if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
 215                 rv = NFS4ERR_DELAY;
 216                 goto unlock;
 217         }
 218
 219         if (pnfs_mark_matching_lsegs_return(lo, &free_me_list,
 220                                 &args->cbl_range,
 221                                 be32_to_cpu(args->cbl_stateid.seqid))) {
 222                 rv = NFS4_OK;
 223                 goto unlock;
 224         }
 225
 226         if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
 227                 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo,
 228                         &args->cbl_range);
 229         }
 230         pnfs_mark_layout_returned_if_empty(lo);
 231 unlock:
 232         spin_unlock(&ino->i_lock);
 233         pnfs_free_lseg_list(&free_me_list);
 234         /* Free all lsegs that are attached to commit buckets */
 235         nfs_commit_inode(ino, 0);
 236         pnfs_put_layout_hdr(lo);
 237         trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino,
 238                         &args->cbl_stateid, -rv);
 239         iput(ino);
 240 out:
 241         return rv;
 242 }
 243
 244 static u32 initiate_bulk_draining(struct nfs_client *clp,
 245                                   struct cb_layoutrecallargs *args)
 246 {
 247         int stat;
 248
 249         if (args->cbl_recall_type == RETURN_FSID)
 250                 stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true);
 251         else
 252                 stat = pnfs_destroy_layouts_byclid(clp, true);
 253         if (stat != 0)
 254                 return NFS4ERR_DELAY;
 255         return NFS4ERR_NOMATCHING_LAYOUT;
 256 }
 257
 258 static u32 do_callback_layoutrecall(struct nfs_client *clp,
 259                                     struct cb_layoutrecallargs *args)
 260 {
 261         u32 res;
 262
 263         dprintk("%s enter, type=%i\n", __func__, args->cbl_recall_type);
 264         if (args->cbl_recall_type == RETURN_FILE)
 265                 res = initiate_file_draining(clp, args);
 266         else
 267                 res = initiate_bulk_draining(clp, args);
 268         dprintk("%s returning %i\n", __func__, res);
 269         return res;
 270
 271 }
 272
 273 __be32 nfs4_callback_layoutrecall(struct cb_layoutrecallargs *args,
 274                                   void *dummy, struct cb_process_state *cps)
 275 {
 276         u32 res;
 277
 278         dprintk("%s: -->\n", __func__);
 279
 280         if (cps->clp)
 281                 res = do_callback_layoutrecall(cps->clp, args);
 282         else
 283                 res = NFS4ERR_OP_NOT_IN_SESSION;
 284
 285         dprintk("%s: exit with status = %d\n", __func__, res);
 286         return cpu_to_be32(res);
 287 }
 288
 289 static void pnfs_recall_all_layouts(struct nfs_client *clp)
 290 {
 291         struct cb_layoutrecallargs args;
 292
 293         /* Pretend we got a CB_LAYOUTRECALL(ALL) */
 294         memset(&args, 0, sizeof(args));
 295         args.cbl_recall_type = RETURN_ALL;
 296         /* FIXME we ignore errors, what should we do? */
 297         do_callback_layoutrecall(clp, &args);
 298 }
 299
 300 __be32 nfs4_callback_devicenotify(struct cb_devicenotifyargs *args,
 301                                   void *dummy, struct cb_process_state *cps)
 302 {
 303         int i;
 304         __be32 res = 0;
 305         struct nfs_client *clp = cps->clp;
 306         struct nfs_server *server = NULL;
 307
 308         dprintk("%s: -->\n", __func__);
 309
 310         if (!clp) {
 311                 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
 312                 goto out;
 313         }
 314
 315         for (i = 0; i < args->ndevs; i++) {
 316                 struct cb_devicenotifyitem *dev = &args->devs[i];
 317
 318                 if (!server ||
 319                     server->pnfs_curr_ld->id != dev->cbd_layout_type) {
 320                         rcu_read_lock();
 321                         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
 322                                 if (server->pnfs_curr_ld &&
 323                                     server->pnfs_curr_ld->id == dev->cbd_layout_type) {
 324                                         rcu_read_unlock();
 325                                         goto found;
 326                                 }
 327                         rcu_read_unlock();
 328                         dprintk("%s: layout type %u not found\n",
 329                                 __func__, dev->cbd_layout_type);
 330                         continue;
 331                 }
 332
 333         found:
 334                 nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id);
 335         }
 336
 337 out:
 338         kfree(args->devs);
 339         dprintk("%s: exit with status = %u\n",
 340                 __func__, be32_to_cpu(res));
 341         return res;
 342 }
 343
 344 /*
 345  * Validate the sequenceID sent by the server.
 346  * Return success if the sequenceID is one more than what we last saw on
 347  * this slot, accounting for wraparound.  Increments the slot's sequence.
 348  *
 349  * We don't yet implement a duplicate request cache, instead we set the
 350  * back channel ca_maxresponsesize_cached to zero. This is OK for now
 351  * since we only currently implement idempotent callbacks anyway.
 352  *
 353  * We have a single slot backchannel at this time, so we don't bother
 354  * checking the used_slots bit array on the table.  The lower layer guarantees
 355  * a single outstanding callback request at a time.
 356  */
 357 static __be32
 358 validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot,
 359                 const struct cb_sequenceargs * args)
 360 {
 361         dprintk("%s enter. slotid %u seqid %u, slot table seqid: %u\n",
 362                 __func__, args->csa_slotid, args->csa_sequenceid, slot->seq_nr);
 363
 364         if (args->csa_slotid > tbl->server_highest_slotid)
 365                 return htonl(NFS4ERR_BADSLOT);
 366
 367         /* Replay */
 368         if (args->csa_sequenceid == slot->seq_nr) {
 369                 dprintk("%s seqid %u is a replay\n",
 370                         __func__, args->csa_sequenceid);
 371                 if (nfs4_test_locked_slot(tbl, slot->slot_nr))
 372                         return htonl(NFS4ERR_DELAY);
 373                 /* Signal process_op to set this error on next op */
 374                 if (args->csa_cachethis == 0)
 375                         return htonl(NFS4ERR_RETRY_UNCACHED_REP);
 376
 377                 /* Liar! We never allowed you to set csa_cachethis != 0 */
 378                 return htonl(NFS4ERR_SEQ_FALSE_RETRY);
 379         }
 380
 381         /* Wraparound */
 382         if (unlikely(slot->seq_nr == 0xFFFFFFFFU)) {
 383                 if (args->csa_sequenceid == 1)
 384                         return htonl(NFS4_OK);
 385         } else if (likely(args->csa_sequenceid == slot->seq_nr + 1))
 386                 return htonl(NFS4_OK);
 387
 388         /* Misordered request */
 389         return htonl(NFS4ERR_SEQ_MISORDERED);
 390 }
 391
 392 /*
 393  * For each referring call triple, check the session's slot table for
 394  * a match.  If the slot is in use and the sequence numbers match, the
 395  * client is still waiting for a response to the original request.
 396  */
 397 static bool referring_call_exists(struct nfs_client *clp,
 398                                   uint32_t nrclists,
 399                                   struct referring_call_list *rclists)
 400 {
 401         bool status = 0;
 402         int i, j;
 403         struct nfs4_session *session;
 404         struct nfs4_slot_table *tbl;
 405         struct referring_call_list *rclist;
 406         struct referring_call *ref;
 407
 408         /*
 409          * XXX When client trunking is implemented, this becomes
 410          * a session lookup from within the loop
 411          */
 412         session = clp->cl_session;
 413         tbl = &session->fc_slot_table;
 414
 415         for (i = 0; i < nrclists; i++) {
 416                 rclist = &rclists[i];
 417                 if (memcmp(session->sess_id.data,
 418                            rclist->rcl_sessionid.data,
 419                            NFS4_MAX_SESSIONID_LEN) != 0)
 420                         continue;
 421
 422                 for (j = 0; j < rclist->rcl_nrefcalls; j++) {
 423                         ref = &rclist->rcl_refcalls[j];
 424
 425                         dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u "
 426                                 "slotid %u\n", __func__,
 427                                 ((u32 *)&rclist->rcl_sessionid.data)[0],
 428                                 ((u32 *)&rclist->rcl_sessionid.data)[1],
 429                                 ((u32 *)&rclist->rcl_sessionid.data)[2],
 430                                 ((u32 *)&rclist->rcl_sessionid.data)[3],
 431                                 ref->rc_sequenceid, ref->rc_slotid);
 432
 433                         spin_lock(&tbl->slot_tbl_lock);
 434                         status = (test_bit(ref->rc_slotid, tbl->used_slots) &&
 435                                   tbl->slots[ref->rc_slotid].seq_nr ==
 436                                         ref->rc_sequenceid);
 437                         spin_unlock(&tbl->slot_tbl_lock);
 438                         if (status)
 439                                 goto out;
 440                 }
 441         }
 442
 443 out:
 444         return status;
 445 }
 446
 447 __be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
 448                               struct cb_sequenceres *res,
 449                               struct cb_process_state *cps)
 450 {
 451         struct nfs4_slot_table *tbl;
 452         struct nfs4_slot *slot;
 453         struct nfs_client *clp;
 454         int i;
 455         __be32 status = htonl(NFS4ERR_BADSESSION);
 456
 457         clp = nfs4_find_client_sessionid(cps->net, args->csa_addr,
 458                                          &args->csa_sessionid, cps->minorversion);
 459         if (clp == NULL)
 460                 goto out;
 461
 462         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
 463                 goto out;
 464
 465         tbl = &clp->cl_session->bc_slot_table;
 466         slot = tbl->slots + args->csa_slotid;
 467
 468         /* Set up res before grabbing the spinlock */
 469         memcpy(&res->csr_sessionid, &args->csa_sessionid,
 470                sizeof(res->csr_sessionid));
 471         res->csr_sequenceid = args->csa_sequenceid;
 472         res->csr_slotid = args->csa_slotid;
 473
 474         spin_lock(&tbl->slot_tbl_lock);
 475         /* state manager is resetting the session */
 476         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
 477                 status = htonl(NFS4ERR_DELAY);
 478                 /* Return NFS4ERR_BADSESSION if we're draining the session
 479                  * in order to reset it.
 480                  */
 481                 if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
 482                         status = htonl(NFS4ERR_BADSESSION);
 483                 goto out_unlock;
 484         }
 485
 486         status = htonl(NFS4ERR_BADSLOT);
 487         slot = nfs4_lookup_slot(tbl, args->csa_slotid);
 488         if (IS_ERR(slot))
 489                 goto out_unlock;
 490
 491         res->csr_highestslotid = tbl->server_highest_slotid;
 492         res->csr_target_highestslotid = tbl->target_highest_slotid;
 493
 494         status = validate_seqid(tbl, slot, args);
 495         if (status)
 496                 goto out_unlock;
 497         if (!nfs4_try_to_lock_slot(tbl, slot)) {
 498                 status = htonl(NFS4ERR_DELAY);
 499                 goto out_unlock;
 500         }
 501         cps->slot = slot;
 502
 503         /* The ca_maxresponsesize_cached is 0 with no DRC */
 504         if (args->csa_cachethis != 0) {
 505                 status = htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
 506                 goto out_unlock;
 507         }
 508
 509         /*
 510          * Check for pending referring calls.  If a match is found, a
 511          * related callback was received before the response to the original
 512          * call.
 513          */
 514         if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) {
 515                 status = htonl(NFS4ERR_DELAY);
 516                 goto out_unlock;
 517         }
 518
 519         /*
 520          * RFC5661 20.9.3
 521          * If CB_SEQUENCE returns an error, then the state of the slot
 522          * (sequence ID, cached reply) MUST NOT change.
 523          */
 524         slot->seq_nr = args->csa_sequenceid;
 525 out_unlock:
 526         spin_unlock(&tbl->slot_tbl_lock);
 527
 528 out:
 529         cps->clp = clp; /* put in nfs4_callback_compound */
 530         for (i = 0; i < args->csa_nrclists; i++)
 531                 kfree(args->csa_rclists[i].rcl_refcalls);
 532         kfree(args->csa_rclists);
 533
 534         if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
 535                 cps->drc_status = status;
 536                 status = 0;
 537         } else
 538                 res->csr_status = status;
 539
 540         trace_nfs4_cb_sequence(args, res, status);
 541         dprintk("%s: exit with status = %d res->csr_status %d\n", __func__,
 542                 ntohl(status), ntohl(res->csr_status));
 543         return status;
 544 }
 545
 546 static bool
 547 validate_bitmap_values(unsigned long mask)
 548 {
 549         return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
 550 }
 551
 552 __be32 nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy,
 553                                struct cb_process_state *cps)
 554 {
 555         __be32 status;
 556         fmode_t flags = 0;
 557
 558         status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
 559         if (!cps->clp) /* set in cb_sequence */
 560                 goto out;
 561
 562         dprintk_rcu("NFS: RECALL_ANY callback request from %s\n",
 563                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
 564
 565         status = cpu_to_be32(NFS4ERR_INVAL);
 566         if (!validate_bitmap_values(args->craa_type_mask))
 567                 goto out;
 568
 569         status = cpu_to_be32(NFS4_OK);
 570         if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *)
 571                      &args->craa_type_mask))
 572                 flags = FMODE_READ;
 573         if (test_bit(RCA4_TYPE_MASK_WDATA_DLG, (const unsigned long *)
 574                      &args->craa_type_mask))
 575                 flags |= FMODE_WRITE;
 576         if (test_bit(RCA4_TYPE_MASK_FILE_LAYOUT, (const unsigned long *)
 577                      &args->craa_type_mask))
 578                 pnfs_recall_all_layouts(cps->clp);
 579         if (flags)
 580                 nfs_expire_unused_delegation_types(cps->clp, flags);
 581 out:
 582         dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
 583         return status;
 584 }
 585
 586 /* Reduce the fore channel's max_slots to the target value */
 587 __be32 nfs4_callback_recallslot(struct cb_recallslotargs *args, void *dummy,
 588                                 struct cb_process_state *cps)
 589 {
 590         struct nfs4_slot_table *fc_tbl;
 591         __be32 status;
 592
 593         status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
 594         if (!cps->clp) /* set in cb_sequence */
 595                 goto out;
 596
 597         dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n",
 598                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
 599                 args->crsa_target_highest_slotid);
 600
 601         fc_tbl = &cps->clp->cl_session->fc_slot_table;
 602
 603         status = htonl(NFS4_OK);
 604
 605         nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid);
 606         nfs41_notify_server(cps->clp);
 607 out:
 608         dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
 609         return status;
 610 }
 611 #endif /* CONFIG_NFS_V4_1 */