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 inode by stateid
 114  *
 115  * Note: returns a refcount on the inode and superblock
 116  */
 117 static struct inode *nfs_layout_find_inode_by_stateid(struct nfs_client *clp,
 118                 const nfs4_stateid *stateid)
 119 {
 120         struct nfs_server *server;
 121         struct inode *inode;
 122         struct pnfs_layout_hdr *lo;
 123
 124 restart:
 125         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
 126                 list_for_each_entry(lo, &server->layouts, plh_layouts) {
 127                         if (stateid != NULL &&
 128                             !nfs4_stateid_match_other(stateid, &lo->plh_stateid))
 129                                 continue;
 130                         inode = igrab(lo->plh_inode);
 131                         if (!inode)
 132                                 continue;
 133                         if (!nfs_sb_active(inode->i_sb)) {
 134                                 rcu_read_unlock();
 135                                 spin_unlock(&clp->cl_lock);
 136                                 iput(inode);
 137                                 spin_lock(&clp->cl_lock);
 138                                 rcu_read_lock();
 139                                 goto restart;
 140                         }
 141                         return inode;
 142                 }
 143         }
 144
 145         return NULL;
 146 }
 147
 148 /*
 149  * Lookup a layout inode by filehandle.
 150  *
 151  * Note: returns a refcount on the inode and superblock
 152  *
 153  */
 154 static struct inode *nfs_layout_find_inode_by_fh(struct nfs_client *clp,
 155                 const struct nfs_fh *fh)
 156 {
 157         struct nfs_server *server;
 158         struct nfs_inode *nfsi;
 159         struct inode *inode;
 160         struct pnfs_layout_hdr *lo;
 161
 162 restart:
 163         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
 164                 list_for_each_entry(lo, &server->layouts, plh_layouts) {
 165                         nfsi = NFS_I(lo->plh_inode);
 166                         if (nfs_compare_fh(fh, &nfsi->fh))
 167                                 continue;
 168                         if (nfsi->layout != lo)
 169                                 continue;
 170                         inode = igrab(lo->plh_inode);
 171                         if (!inode)
 172                                 continue;
 173                         if (!nfs_sb_active(inode->i_sb)) {
 174                                 rcu_read_unlock();
 175                                 spin_unlock(&clp->cl_lock);
 176                                 iput(inode);
 177                                 spin_lock(&clp->cl_lock);
 178                                 rcu_read_lock();
 179                                 goto restart;
 180                         }
 181                         return inode;
 182                 }
 183         }
 184
 185         return NULL;
 186 }
 187
 188 static struct inode *nfs_layout_find_inode(struct nfs_client *clp,
 189                 const struct nfs_fh *fh,
 190                 const nfs4_stateid *stateid)
 191 {
 192         struct inode *inode;
 193
 194         spin_lock(&clp->cl_lock);
 195         rcu_read_lock();
 196         inode = nfs_layout_find_inode_by_stateid(clp, stateid);
 197         if (!inode)
 198                 inode = nfs_layout_find_inode_by_fh(clp, fh);
 199         rcu_read_unlock();
 200         spin_unlock(&clp->cl_lock);
 201
 202         return inode;
 203 }
 204
 205 /*
 206  * Enforce RFC5661 section 12.5.5.2.1. (Layout Recall and Return Sequencing)
 207  */
 208 static u32 pnfs_check_callback_stateid(struct pnfs_layout_hdr *lo,
 209                                         const nfs4_stateid *new)
 210 {
 211         u32 oldseq, newseq;
 212
 213         /* Is the stateid still not initialised? */
 214         if (!pnfs_layout_is_valid(lo))
 215                 return NFS4ERR_DELAY;
 216
 217         /* Mismatched stateid? */
 218         if (!nfs4_stateid_match_other(&lo->plh_stateid, new))
 219                 return NFS4ERR_BAD_STATEID;
 220
 221         newseq = be32_to_cpu(new->seqid);
 222         /* Are we already in a layout recall situation? */
 223         if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
 224             lo->plh_return_seq != 0) {
 225                 if (newseq < lo->plh_return_seq)
 226                         return NFS4ERR_OLD_STATEID;
 227                 if (newseq > lo->plh_return_seq)
 228                         return NFS4ERR_DELAY;
 229                 goto out;
 230         }
 231
 232         /* Check that the stateid matches what we think it should be. */
 233         oldseq = be32_to_cpu(lo->plh_stateid.seqid);
 234         if (newseq > oldseq + 1)
 235                 return NFS4ERR_DELAY;
 236         /* Crazy server! */
 237         if (newseq <= oldseq)
 238                 return NFS4ERR_OLD_STATEID;
 239 out:
 240         return NFS_OK;
 241 }
 242
 243 static u32 initiate_file_draining(struct nfs_client *clp,
 244                                   struct cb_layoutrecallargs *args)
 245 {
 246         struct inode *ino;
 247         struct pnfs_layout_hdr *lo;
 248         u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
 249         LIST_HEAD(free_me_list);
 250
 251         ino = nfs_layout_find_inode(clp, &args->cbl_fh, &args->cbl_stateid);
 252         if (!ino)
 253                 goto out;
 254
 255         pnfs_layoutcommit_inode(ino, false);
 256
 257
 258         spin_lock(&ino->i_lock);
 259         lo = NFS_I(ino)->layout;
 260         if (!lo) {
 261                 spin_unlock(&ino->i_lock);
 262                 goto out;
 263         }
 264         pnfs_get_layout_hdr(lo);
 265         rv = pnfs_check_callback_stateid(lo, &args->cbl_stateid);
 266         if (rv != NFS_OK)
 267                 goto unlock;
 268         pnfs_set_layout_stateid(lo, &args->cbl_stateid, true);
 269
 270         /*
 271          * Enforce RFC5661 Section 12.5.5.2.1.5 (Bulk Recall and Return)
 272          */
 273         if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
 274                 rv = NFS4ERR_DELAY;
 275                 goto unlock;
 276         }
 277
 278         if (pnfs_mark_matching_lsegs_return(lo, &free_me_list,
 279                                 &args->cbl_range,
 280                                 be32_to_cpu(args->cbl_stateid.seqid))) {
 281                 rv = NFS4_OK;
 282                 goto unlock;
 283         }
 284
 285         /* Embrace your forgetfulness! */
 286         rv = NFS4ERR_NOMATCHING_LAYOUT;
 287
 288         if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
 289                 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo,
 290                         &args->cbl_range);
 291         }
 292 unlock:
 293         spin_unlock(&ino->i_lock);
 294         pnfs_free_lseg_list(&free_me_list);
 295         /* Free all lsegs that are attached to commit buckets */
 296         nfs_commit_inode(ino, 0);
 297         pnfs_put_layout_hdr(lo);
 298 out:
 299         trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino,
 300                         &args->cbl_stateid, -rv);
 301         nfs_iput_and_deactive(ino);
 302         return rv;
 303 }
 304
 305 static u32 initiate_bulk_draining(struct nfs_client *clp,
 306                                   struct cb_layoutrecallargs *args)
 307 {
 308         int stat;
 309
 310         if (args->cbl_recall_type == RETURN_FSID)
 311                 stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true);
 312         else
 313                 stat = pnfs_destroy_layouts_byclid(clp, true);
 314         if (stat != 0)
 315                 return NFS4ERR_DELAY;
 316         return NFS4ERR_NOMATCHING_LAYOUT;
 317 }
 318
 319 static u32 do_callback_layoutrecall(struct nfs_client *clp,
 320                                     struct cb_layoutrecallargs *args)
 321 {
 322         if (args->cbl_recall_type == RETURN_FILE)
 323                 return initiate_file_draining(clp, args);
 324         return initiate_bulk_draining(clp, args);
 325 }
 326
 327 __be32 nfs4_callback_layoutrecall(struct cb_layoutrecallargs *args,
 328                                   void *dummy, struct cb_process_state *cps)
 329 {
 330         u32 res = NFS4ERR_OP_NOT_IN_SESSION;
 331
 332         if (cps->clp)
 333                 res = do_callback_layoutrecall(cps->clp, args);
 334         return cpu_to_be32(res);
 335 }
 336
 337 static void pnfs_recall_all_layouts(struct nfs_client *clp)
 338 {
 339         struct cb_layoutrecallargs args;
 340
 341         /* Pretend we got a CB_LAYOUTRECALL(ALL) */
 342         memset(&args, 0, sizeof(args));
 343         args.cbl_recall_type = RETURN_ALL;
 344         /* FIXME we ignore errors, what should we do? */
 345         do_callback_layoutrecall(clp, &args);
 346 }
 347
 348 __be32 nfs4_callback_devicenotify(struct cb_devicenotifyargs *args,
 349                                   void *dummy, struct cb_process_state *cps)
 350 {
 351         int i;
 352         __be32 res = 0;
 353         struct nfs_client *clp = cps->clp;
 354         struct nfs_server *server = NULL;
 355
 356         if (!clp) {
 357                 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
 358                 goto out;
 359         }
 360
 361         for (i = 0; i < args->ndevs; i++) {
 362                 struct cb_devicenotifyitem *dev = &args->devs[i];
 363
 364                 if (!server ||
 365                     server->pnfs_curr_ld->id != dev->cbd_layout_type) {
 366                         rcu_read_lock();
 367                         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
 368                                 if (server->pnfs_curr_ld &&
 369                                     server->pnfs_curr_ld->id == dev->cbd_layout_type) {
 370                                         rcu_read_unlock();
 371                                         goto found;
 372                                 }
 373                         rcu_read_unlock();
 374                         continue;
 375                 }
 376
 377         found:
 378                 nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id);
 379         }
 380
 381 out:
 382         kfree(args->devs);
 383         return res;
 384 }
 385
 386 /*
 387  * Validate the sequenceID sent by the server.
 388  * Return success if the sequenceID is one more than what we last saw on
 389  * this slot, accounting for wraparound.  Increments the slot's sequence.
 390  *
 391  * We don't yet implement a duplicate request cache, instead we set the
 392  * back channel ca_maxresponsesize_cached to zero. This is OK for now
 393  * since we only currently implement idempotent callbacks anyway.
 394  *
 395  * We have a single slot backchannel at this time, so we don't bother
 396  * checking the used_slots bit array on the table.  The lower layer guarantees
 397  * a single outstanding callback request at a time.
 398  */
 399 static __be32
 400 validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot,
 401                 const struct cb_sequenceargs * args)
 402 {
 403         if (args->csa_slotid > tbl->server_highest_slotid)
 404                 return htonl(NFS4ERR_BADSLOT);
 405
 406         /* Replay */
 407         if (args->csa_sequenceid == slot->seq_nr) {
 408                 if (nfs4_test_locked_slot(tbl, slot->slot_nr))
 409                         return htonl(NFS4ERR_DELAY);
 410                 /* Signal process_op to set this error on next op */
 411                 if (args->csa_cachethis == 0)
 412                         return htonl(NFS4ERR_RETRY_UNCACHED_REP);
 413
 414                 /* Liar! We never allowed you to set csa_cachethis != 0 */
 415                 return htonl(NFS4ERR_SEQ_FALSE_RETRY);
 416         }
 417
 418         /* Wraparound */
 419         if (unlikely(slot->seq_nr == 0xFFFFFFFFU)) {
 420                 if (args->csa_sequenceid == 1)
 421                         return htonl(NFS4_OK);
 422         } else if (likely(args->csa_sequenceid == slot->seq_nr + 1))
 423                 return htonl(NFS4_OK);
 424
 425         /* Misordered request */
 426         return htonl(NFS4ERR_SEQ_MISORDERED);
 427 }
 428
 429 /*
 430  * For each referring call triple, check the session's slot table for
 431  * a match.  If the slot is in use and the sequence numbers match, the
 432  * client is still waiting for a response to the original request.
 433  */
 434 static bool referring_call_exists(struct nfs_client *clp,
 435                                   uint32_t nrclists,
 436                                   struct referring_call_list *rclists)
 437 {
 438         bool status = 0;
 439         int i, j;
 440         struct nfs4_session *session;
 441         struct nfs4_slot_table *tbl;
 442         struct referring_call_list *rclist;
 443         struct referring_call *ref;
 444
 445         /*
 446          * XXX When client trunking is implemented, this becomes
 447          * a session lookup from within the loop
 448          */
 449         session = clp->cl_session;
 450         tbl = &session->fc_slot_table;
 451
 452         for (i = 0; i < nrclists; i++) {
 453                 rclist = &rclists[i];
 454                 if (memcmp(session->sess_id.data,
 455                            rclist->rcl_sessionid.data,
 456                            NFS4_MAX_SESSIONID_LEN) != 0)
 457                         continue;
 458
 459                 for (j = 0; j < rclist->rcl_nrefcalls; j++) {
 460                         ref = &rclist->rcl_refcalls[j];
 461                         status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid,
 462                                         ref->rc_sequenceid, HZ >> 1) < 0;
 463                         if (status)
 464                                 goto out;
 465                 }
 466         }
 467
 468 out:
 469         return status;
 470 }
 471
 472 __be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
 473                               struct cb_sequenceres *res,
 474                               struct cb_process_state *cps)
 475 {
 476         struct nfs4_slot_table *tbl;
 477         struct nfs4_slot *slot;
 478         struct nfs_client *clp;
 479         int i;
 480         __be32 status = htonl(NFS4ERR_BADSESSION);
 481
 482         clp = nfs4_find_client_sessionid(cps->net, args->csa_addr,
 483                                          &args->csa_sessionid, cps->minorversion);
 484         if (clp == NULL)
 485                 goto out;
 486
 487         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
 488                 goto out;
 489
 490         tbl = &clp->cl_session->bc_slot_table;
 491
 492         /* Set up res before grabbing the spinlock */
 493         memcpy(&res->csr_sessionid, &args->csa_sessionid,
 494                sizeof(res->csr_sessionid));
 495         res->csr_sequenceid = args->csa_sequenceid;
 496         res->csr_slotid = args->csa_slotid;
 497
 498         spin_lock(&tbl->slot_tbl_lock);
 499         /* state manager is resetting the session */
 500         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
 501                 status = htonl(NFS4ERR_DELAY);
 502                 /* Return NFS4ERR_BADSESSION if we're draining the session
 503                  * in order to reset it.
 504                  */
 505                 if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
 506                         status = htonl(NFS4ERR_BADSESSION);
 507                 goto out_unlock;
 508         }
 509
 510         status = htonl(NFS4ERR_BADSLOT);
 511         slot = nfs4_lookup_slot(tbl, args->csa_slotid);
 512         if (IS_ERR(slot))
 513                 goto out_unlock;
 514
 515         res->csr_highestslotid = tbl->server_highest_slotid;
 516         res->csr_target_highestslotid = tbl->target_highest_slotid;
 517
 518         status = validate_seqid(tbl, slot, args);
 519         if (status)
 520                 goto out_unlock;
 521         if (!nfs4_try_to_lock_slot(tbl, slot)) {
 522                 status = htonl(NFS4ERR_DELAY);
 523                 goto out_unlock;
 524         }
 525         cps->slot = slot;
 526
 527         /* The ca_maxresponsesize_cached is 0 with no DRC */
 528         if (args->csa_cachethis != 0) {
 529                 status = htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
 530                 goto out_unlock;
 531         }
 532
 533         /*
 534          * Check for pending referring calls.  If a match is found, a
 535          * related callback was received before the response to the original
 536          * call.
 537          */
 538         if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) {
 539                 status = htonl(NFS4ERR_DELAY);
 540                 goto out_unlock;
 541         }
 542
 543         /*
 544          * RFC5661 20.9.3
 545          * If CB_SEQUENCE returns an error, then the state of the slot
 546          * (sequence ID, cached reply) MUST NOT change.
 547          */
 548         slot->seq_nr = args->csa_sequenceid;
 549 out_unlock:
 550         spin_unlock(&tbl->slot_tbl_lock);
 551
 552 out:
 553         cps->clp = clp; /* put in nfs4_callback_compound */
 554         for (i = 0; i < args->csa_nrclists; i++)
 555                 kfree(args->csa_rclists[i].rcl_refcalls);
 556         kfree(args->csa_rclists);
 557
 558         if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
 559                 cps->drc_status = status;
 560                 status = 0;
 561         } else
 562                 res->csr_status = status;
 563
 564         trace_nfs4_cb_sequence(args, res, status);
 565         return status;
 566 }
 567
 568 static bool
 569 validate_bitmap_values(unsigned long mask)
 570 {
 571         return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
 572 }
 573
 574 __be32 nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy,
 575                                struct cb_process_state *cps)
 576 {
 577         __be32 status;
 578         fmode_t flags = 0;
 579
 580         status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
 581         if (!cps->clp) /* set in cb_sequence */
 582                 goto out;
 583
 584         dprintk_rcu("NFS: RECALL_ANY callback request from %s\n",
 585                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
 586
 587         status = cpu_to_be32(NFS4ERR_INVAL);
 588         if (!validate_bitmap_values(args->craa_type_mask))
 589                 goto out;
 590
 591         status = cpu_to_be32(NFS4_OK);
 592         if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *)
 593                      &args->craa_type_mask))
 594                 flags = FMODE_READ;
 595         if (test_bit(RCA4_TYPE_MASK_WDATA_DLG, (const unsigned long *)
 596                      &args->craa_type_mask))
 597                 flags |= FMODE_WRITE;
 598         if (test_bit(RCA4_TYPE_MASK_FILE_LAYOUT, (const unsigned long *)
 599                      &args->craa_type_mask))
 600                 pnfs_recall_all_layouts(cps->clp);
 601         if (flags)
 602                 nfs_expire_unused_delegation_types(cps->clp, flags);
 603 out:
 604         dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
 605         return status;
 606 }
 607
 608 /* Reduce the fore channel's max_slots to the target value */
 609 __be32 nfs4_callback_recallslot(struct cb_recallslotargs *args, void *dummy,
 610                                 struct cb_process_state *cps)
 611 {
 612         struct nfs4_slot_table *fc_tbl;
 613         __be32 status;
 614
 615         status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
 616         if (!cps->clp) /* set in cb_sequence */
 617                 goto out;
 618
 619         dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n",
 620                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
 621                 args->crsa_target_highest_slotid);
 622
 623         fc_tbl = &cps->clp->cl_session->fc_slot_table;
 624
 625         status = htonl(NFS4_OK);
 626
 627         nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid);
 628         nfs41_notify_server(cps->clp);
 629 out:
 630         dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
 631         return status;
 632 }
 633
 634 __be32 nfs4_callback_notify_lock(struct cb_notify_lock_args *args, void *dummy,
 635                                  struct cb_process_state *cps)
 636 {
 637         if (!cps->clp) /* set in cb_sequence */
 638                 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
 639
 640         dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n",
 641                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
 642
 643         /* Don't wake anybody if the string looked bogus */
 644         if (args->cbnl_valid)
 645                 __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args);
 646
 647         return htonl(NFS4_OK);
 648 }
 649 #endif /* CONFIG_NFS_V4_1 */