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(void *argp, void *resp,
  23                              struct cb_process_state *cps)
  24 {
  25         struct cb_getattrargs *args = argp;
  26         struct cb_getattrres *res = resp;
  27         struct nfs_delegation *delegation;
  28         struct nfs_inode *nfsi;
  29         struct inode *inode;
  30
  31         res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
  32         if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
  33                 goto out;
  34
  35         res->bitmap[0] = res->bitmap[1] = 0;
  36         res->status = htonl(NFS4ERR_BADHANDLE);
  37
  38         dprintk_rcu("NFS: GETATTR callback request from %s\n",
  39                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
  40
  41         inode = nfs_delegation_find_inode(cps->clp, &args->fh);
  42         if (inode == NULL) {
  43                 trace_nfs4_cb_getattr(cps->clp, &args->fh, NULL,
  44                                 -ntohl(res->status));
  45                 goto out;
  46         }
  47         nfsi = NFS_I(inode);
  48         rcu_read_lock();
  49         delegation = rcu_dereference(nfsi->delegation);
  50         if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)
  51                 goto out_iput;
  52         res->size = i_size_read(inode);
  53         res->change_attr = delegation->change_attr;
  54         if (nfsi->nrequests != 0)
  55                 res->change_attr++;
  56         res->ctime = inode->i_ctime;
  57         res->mtime = inode->i_mtime;
  58         res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
  59                 args->bitmap[0];
  60         res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &
  61                 args->bitmap[1];
  62         res->status = 0;
  63 out_iput:
  64         rcu_read_unlock();
  65         trace_nfs4_cb_getattr(cps->clp, &args->fh, inode, -ntohl(res->status));
  66         iput(inode);
  67 out:
  68         dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
  69         return res->status;
  70 }
  71
  72 __be32 nfs4_callback_recall(void *argp, void *resp,
  73                             struct cb_process_state *cps)
  74 {
  75         struct cb_recallargs *args = argp;
  76         struct inode *inode;
  77         __be32 res;
  78
  79         res = htonl(NFS4ERR_OP_NOT_IN_SESSION);
  80         if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
  81                 goto out;
  82
  83         dprintk_rcu("NFS: RECALL callback request from %s\n",
  84                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
  85
  86         res = htonl(NFS4ERR_BADHANDLE);
  87         inode = nfs_delegation_find_inode(cps->clp, &args->fh);
  88         if (inode == NULL) {
  89                 trace_nfs4_cb_recall(cps->clp, &args->fh, NULL,
  90                                 &args->stateid, -ntohl(res));
  91                 goto out;
  92         }
  93         /* Set up a helper thread to actually return the delegation */
  94         switch (nfs_async_inode_return_delegation(inode, &args->stateid)) {
  95         case 0:
  96                 res = 0;
  97                 break;
  98         case -ENOENT:
  99                 res = htonl(NFS4ERR_BAD_STATEID);
 100                 break;
 101         default:
 102                 res = htonl(NFS4ERR_RESOURCE);
 103         }
 104         trace_nfs4_cb_recall(cps->clp, &args->fh, inode,
 105                         &args->stateid, -ntohl(res));
 106         iput(inode);
 107 out:
 108         dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
 109         return res;
 110 }
 111
 112 #if defined(CONFIG_NFS_V4_1)
 113
 114 /*
 115  * Lookup a layout inode by stateid
 116  *
 117  * Note: returns a refcount on the inode and superblock
 118  */
 119 static struct inode *nfs_layout_find_inode_by_stateid(struct nfs_client *clp,
 120                 const nfs4_stateid *stateid)
 121 {
 122         struct nfs_server *server;
 123         struct inode *inode;
 124         struct pnfs_layout_hdr *lo;
 125
 126 restart:
 127         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
 128                 list_for_each_entry(lo, &server->layouts, plh_layouts) {
 129                         if (stateid != NULL &&
 130                             !nfs4_stateid_match_other(stateid, &lo->plh_stateid))
 131                                 continue;
 132                         inode = igrab(lo->plh_inode);
 133                         if (!inode)
 134                                 continue;
 135                         if (!nfs_sb_active(inode->i_sb)) {
 136                                 rcu_read_unlock();
 137                                 spin_unlock(&clp->cl_lock);
 138                                 iput(inode);
 139                                 spin_lock(&clp->cl_lock);
 140                                 rcu_read_lock();
 141                                 goto restart;
 142                         }
 143                         return inode;
 144                 }
 145         }
 146
 147         return NULL;
 148 }
 149
 150 /*
 151  * Lookup a layout inode by filehandle.
 152  *
 153  * Note: returns a refcount on the inode and superblock
 154  *
 155  */
 156 static struct inode *nfs_layout_find_inode_by_fh(struct nfs_client *clp,
 157                 const struct nfs_fh *fh)
 158 {
 159         struct nfs_server *server;
 160         struct nfs_inode *nfsi;
 161         struct inode *inode;
 162         struct pnfs_layout_hdr *lo;
 163
 164 restart:
 165         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
 166                 list_for_each_entry(lo, &server->layouts, plh_layouts) {
 167                         nfsi = NFS_I(lo->plh_inode);
 168                         if (nfs_compare_fh(fh, &nfsi->fh))
 169                                 continue;
 170                         if (nfsi->layout != lo)
 171                                 continue;
 172                         inode = igrab(lo->plh_inode);
 173                         if (!inode)
 174                                 continue;
 175                         if (!nfs_sb_active(inode->i_sb)) {
 176                                 rcu_read_unlock();
 177                                 spin_unlock(&clp->cl_lock);
 178                                 iput(inode);
 179                                 spin_lock(&clp->cl_lock);
 180                                 rcu_read_lock();
 181                                 goto restart;
 182                         }
 183                         return inode;
 184                 }
 185         }
 186
 187         return NULL;
 188 }
 189
 190 static struct inode *nfs_layout_find_inode(struct nfs_client *clp,
 191                 const struct nfs_fh *fh,
 192                 const nfs4_stateid *stateid)
 193 {
 194         struct inode *inode;
 195
 196         spin_lock(&clp->cl_lock);
 197         rcu_read_lock();
 198         inode = nfs_layout_find_inode_by_stateid(clp, stateid);
 199         if (!inode)
 200                 inode = nfs_layout_find_inode_by_fh(clp, fh);
 201         rcu_read_unlock();
 202         spin_unlock(&clp->cl_lock);
 203
 204         return inode;
 205 }
 206
 207 /*
 208  * Enforce RFC5661 section 12.5.5.2.1. (Layout Recall and Return Sequencing)
 209  */
 210 static u32 pnfs_check_callback_stateid(struct pnfs_layout_hdr *lo,
 211                                         const nfs4_stateid *new)
 212 {
 213         u32 oldseq, newseq;
 214
 215         /* Is the stateid still not initialised? */
 216         if (!pnfs_layout_is_valid(lo))
 217                 return NFS4ERR_DELAY;
 218
 219         /* Mismatched stateid? */
 220         if (!nfs4_stateid_match_other(&lo->plh_stateid, new))
 221                 return NFS4ERR_BAD_STATEID;
 222
 223         newseq = be32_to_cpu(new->seqid);
 224         /* Are we already in a layout recall situation? */
 225         if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
 226             lo->plh_return_seq != 0) {
 227                 if (newseq < lo->plh_return_seq)
 228                         return NFS4ERR_OLD_STATEID;
 229                 if (newseq > lo->plh_return_seq)
 230                         return NFS4ERR_DELAY;
 231                 goto out;
 232         }
 233
 234         /* Check that the stateid matches what we think it should be. */
 235         oldseq = be32_to_cpu(lo->plh_stateid.seqid);
 236         if (newseq > oldseq + 1)
 237                 return NFS4ERR_DELAY;
 238         /* Crazy server! */
 239         if (newseq <= oldseq)
 240                 return NFS4ERR_OLD_STATEID;
 241 out:
 242         return NFS_OK;
 243 }
 244
 245 static u32 initiate_file_draining(struct nfs_client *clp,
 246                                   struct cb_layoutrecallargs *args)
 247 {
 248         struct inode *ino;
 249         struct pnfs_layout_hdr *lo;
 250         u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
 251         LIST_HEAD(free_me_list);
 252
 253         ino = nfs_layout_find_inode(clp, &args->cbl_fh, &args->cbl_stateid);
 254         if (!ino)
 255                 goto out;
 256
 257         pnfs_layoutcommit_inode(ino, false);
 258
 259
 260         spin_lock(&ino->i_lock);
 261         lo = NFS_I(ino)->layout;
 262         if (!lo) {
 263                 spin_unlock(&ino->i_lock);
 264                 goto out;
 265         }
 266         pnfs_get_layout_hdr(lo);
 267         rv = pnfs_check_callback_stateid(lo, &args->cbl_stateid);
 268         if (rv != NFS_OK)
 269                 goto unlock;
 270         pnfs_set_layout_stateid(lo, &args->cbl_stateid, true);
 271
 272         /*
 273          * Enforce RFC5661 Section 12.5.5.2.1.5 (Bulk Recall and Return)
 274          */
 275         if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
 276                 rv = NFS4ERR_DELAY;
 277                 goto unlock;
 278         }
 279
 280         if (pnfs_mark_matching_lsegs_return(lo, &free_me_list,
 281                                 &args->cbl_range,
 282                                 be32_to_cpu(args->cbl_stateid.seqid))) {
 283                 rv = NFS4_OK;
 284                 goto unlock;
 285         }
 286
 287         /* Embrace your forgetfulness! */
 288         rv = NFS4ERR_NOMATCHING_LAYOUT;
 289
 290         if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
 291                 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo,
 292                         &args->cbl_range);
 293         }
 294 unlock:
 295         spin_unlock(&ino->i_lock);
 296         pnfs_free_lseg_list(&free_me_list);
 297         /* Free all lsegs that are attached to commit buckets */
 298         nfs_commit_inode(ino, 0);
 299         pnfs_put_layout_hdr(lo);
 300 out:
 301         trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino,
 302                         &args->cbl_stateid, -rv);
 303         nfs_iput_and_deactive(ino);
 304         return rv;
 305 }
 306
 307 static u32 initiate_bulk_draining(struct nfs_client *clp,
 308                                   struct cb_layoutrecallargs *args)
 309 {
 310         int stat;
 311
 312         if (args->cbl_recall_type == RETURN_FSID)
 313                 stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true);
 314         else
 315                 stat = pnfs_destroy_layouts_byclid(clp, true);
 316         if (stat != 0)
 317                 return NFS4ERR_DELAY;
 318         return NFS4ERR_NOMATCHING_LAYOUT;
 319 }
 320
 321 static u32 do_callback_layoutrecall(struct nfs_client *clp,
 322                                     struct cb_layoutrecallargs *args)
 323 {
 324         if (args->cbl_recall_type == RETURN_FILE)
 325                 return initiate_file_draining(clp, args);
 326         return initiate_bulk_draining(clp, args);
 327 }
 328
 329 __be32 nfs4_callback_layoutrecall(void *argp, void *resp,
 330                                   struct cb_process_state *cps)
 331 {
 332         struct cb_layoutrecallargs *args = argp;
 333         u32 res = NFS4ERR_OP_NOT_IN_SESSION;
 334
 335         if (cps->clp)
 336                 res = do_callback_layoutrecall(cps->clp, args);
 337         return cpu_to_be32(res);
 338 }
 339
 340 static void pnfs_recall_all_layouts(struct nfs_client *clp)
 341 {
 342         struct cb_layoutrecallargs args;
 343
 344         /* Pretend we got a CB_LAYOUTRECALL(ALL) */
 345         memset(&args, 0, sizeof(args));
 346         args.cbl_recall_type = RETURN_ALL;
 347         /* FIXME we ignore errors, what should we do? */
 348         do_callback_layoutrecall(clp, &args);
 349 }
 350
 351 __be32 nfs4_callback_devicenotify(void *argp, void *resp,
 352                                   struct cb_process_state *cps)
 353 {
 354         struct cb_devicenotifyargs *args = argp;
 355         int i;
 356         __be32 res = 0;
 357         struct nfs_client *clp = cps->clp;
 358         struct nfs_server *server = NULL;
 359
 360         if (!clp) {
 361                 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
 362                 goto out;
 363         }
 364
 365         for (i = 0; i < args->ndevs; i++) {
 366                 struct cb_devicenotifyitem *dev = &args->devs[i];
 367
 368                 if (!server ||
 369                     server->pnfs_curr_ld->id != dev->cbd_layout_type) {
 370                         rcu_read_lock();
 371                         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
 372                                 if (server->pnfs_curr_ld &&
 373                                     server->pnfs_curr_ld->id == dev->cbd_layout_type) {
 374                                         rcu_read_unlock();
 375                                         goto found;
 376                                 }
 377                         rcu_read_unlock();
 378                         continue;
 379                 }
 380
 381         found:
 382                 nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id);
 383         }
 384
 385 out:
 386         kfree(args->devs);
 387         return res;
 388 }
 389
 390 /*
 391  * Validate the sequenceID sent by the server.
 392  * Return success if the sequenceID is one more than what we last saw on
 393  * this slot, accounting for wraparound.  Increments the slot's sequence.
 394  *
 395  * We don't yet implement a duplicate request cache, instead we set the
 396  * back channel ca_maxresponsesize_cached to zero. This is OK for now
 397  * since we only currently implement idempotent callbacks anyway.
 398  *
 399  * We have a single slot backchannel at this time, so we don't bother
 400  * checking the used_slots bit array on the table.  The lower layer guarantees
 401  * a single outstanding callback request at a time.
 402  */
 403 static __be32
 404 validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot,
 405                 const struct cb_sequenceargs * args)
 406 {
 407         if (args->csa_slotid > tbl->server_highest_slotid)
 408                 return htonl(NFS4ERR_BADSLOT);
 409
 410         /* Replay */
 411         if (args->csa_sequenceid == slot->seq_nr) {
 412                 if (nfs4_test_locked_slot(tbl, slot->slot_nr))
 413                         return htonl(NFS4ERR_DELAY);
 414                 /* Signal process_op to set this error on next op */
 415                 if (args->csa_cachethis == 0)
 416                         return htonl(NFS4ERR_RETRY_UNCACHED_REP);
 417
 418                 /* Liar! We never allowed you to set csa_cachethis != 0 */
 419                 return htonl(NFS4ERR_SEQ_FALSE_RETRY);
 420         }
 421
 422         /* Wraparound */
 423         if (unlikely(slot->seq_nr == 0xFFFFFFFFU)) {
 424                 if (args->csa_sequenceid == 1)
 425                         return htonl(NFS4_OK);
 426         } else if (likely(args->csa_sequenceid == slot->seq_nr + 1))
 427                 return htonl(NFS4_OK);
 428
 429         /* Misordered request */
 430         return htonl(NFS4ERR_SEQ_MISORDERED);
 431 }
 432
 433 /*
 434  * For each referring call triple, check the session's slot table for
 435  * a match.  If the slot is in use and the sequence numbers match, the
 436  * client is still waiting for a response to the original request.
 437  */
 438 static bool referring_call_exists(struct nfs_client *clp,
 439                                   uint32_t nrclists,
 440                                   struct referring_call_list *rclists)
 441 {
 442         bool status = 0;
 443         int i, j;
 444         struct nfs4_session *session;
 445         struct nfs4_slot_table *tbl;
 446         struct referring_call_list *rclist;
 447         struct referring_call *ref;
 448
 449         /*
 450          * XXX When client trunking is implemented, this becomes
 451          * a session lookup from within the loop
 452          */
 453         session = clp->cl_session;
 454         tbl = &session->fc_slot_table;
 455
 456         for (i = 0; i < nrclists; i++) {
 457                 rclist = &rclists[i];
 458                 if (memcmp(session->sess_id.data,
 459                            rclist->rcl_sessionid.data,
 460                            NFS4_MAX_SESSIONID_LEN) != 0)
 461                         continue;
 462
 463                 for (j = 0; j < rclist->rcl_nrefcalls; j++) {
 464                         ref = &rclist->rcl_refcalls[j];
 465                         status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid,
 466                                         ref->rc_sequenceid, HZ >> 1) < 0;
 467                         if (status)
 468                                 goto out;
 469                 }
 470         }
 471
 472 out:
 473         return status;
 474 }
 475
 476 __be32 nfs4_callback_sequence(void *argp, void *resp,
 477                               struct cb_process_state *cps)
 478 {
 479         struct cb_sequenceargs *args = argp;
 480         struct cb_sequenceres *res = resp;
 481         struct nfs4_slot_table *tbl;
 482         struct nfs4_slot *slot;
 483         struct nfs_client *clp;
 484         int i;
 485         __be32 status = htonl(NFS4ERR_BADSESSION);
 486
 487         clp = nfs4_find_client_sessionid(cps->net, args->csa_addr,
 488                                          &args->csa_sessionid, cps->minorversion);
 489         if (clp == NULL)
 490                 goto out;
 491
 492         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
 493                 goto out;
 494
 495         tbl = &clp->cl_session->bc_slot_table;
 496
 497         /* Set up res before grabbing the spinlock */
 498         memcpy(&res->csr_sessionid, &args->csa_sessionid,
 499                sizeof(res->csr_sessionid));
 500         res->csr_sequenceid = args->csa_sequenceid;
 501         res->csr_slotid = args->csa_slotid;
 502
 503         spin_lock(&tbl->slot_tbl_lock);
 504         /* state manager is resetting the session */
 505         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
 506                 status = htonl(NFS4ERR_DELAY);
 507                 /* Return NFS4ERR_BADSESSION if we're draining the session
 508                  * in order to reset it.
 509                  */
 510                 if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
 511                         status = htonl(NFS4ERR_BADSESSION);
 512                 goto out_unlock;
 513         }
 514
 515         status = htonl(NFS4ERR_BADSLOT);
 516         slot = nfs4_lookup_slot(tbl, args->csa_slotid);
 517         if (IS_ERR(slot))
 518                 goto out_unlock;
 519
 520         res->csr_highestslotid = tbl->server_highest_slotid;
 521         res->csr_target_highestslotid = tbl->target_highest_slotid;
 522
 523         status = validate_seqid(tbl, slot, args);
 524         if (status)
 525                 goto out_unlock;
 526         if (!nfs4_try_to_lock_slot(tbl, slot)) {
 527                 status = htonl(NFS4ERR_DELAY);
 528                 goto out_unlock;
 529         }
 530         cps->slot = slot;
 531
 532         /* The ca_maxresponsesize_cached is 0 with no DRC */
 533         if (args->csa_cachethis != 0) {
 534                 status = htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
 535                 goto out_unlock;
 536         }
 537
 538         /*
 539          * Check for pending referring calls.  If a match is found, a
 540          * related callback was received before the response to the original
 541          * call.
 542          */
 543         if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) {
 544                 status = htonl(NFS4ERR_DELAY);
 545                 goto out_unlock;
 546         }
 547
 548         /*
 549          * RFC5661 20.9.3
 550          * If CB_SEQUENCE returns an error, then the state of the slot
 551          * (sequence ID, cached reply) MUST NOT change.
 552          */
 553         slot->seq_nr = args->csa_sequenceid;
 554 out_unlock:
 555         spin_unlock(&tbl->slot_tbl_lock);
 556
 557 out:
 558         cps->clp = clp; /* put in nfs4_callback_compound */
 559         for (i = 0; i < args->csa_nrclists; i++)
 560                 kfree(args->csa_rclists[i].rcl_refcalls);
 561         kfree(args->csa_rclists);
 562
 563         if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
 564                 cps->drc_status = status;
 565                 status = 0;
 566         } else
 567                 res->csr_status = status;
 568
 569         trace_nfs4_cb_sequence(args, res, status);
 570         return status;
 571 }
 572
 573 static bool
 574 validate_bitmap_values(unsigned long mask)
 575 {
 576         return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
 577 }
 578
 579 __be32 nfs4_callback_recallany(void *argp, void *resp,
 580                                struct cb_process_state *cps)
 581 {
 582         struct cb_recallanyargs *args = argp;
 583         __be32 status;
 584         fmode_t flags = 0;
 585
 586         status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
 587         if (!cps->clp) /* set in cb_sequence */
 588                 goto out;
 589
 590         dprintk_rcu("NFS: RECALL_ANY callback request from %s\n",
 591                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
 592
 593         status = cpu_to_be32(NFS4ERR_INVAL);
 594         if (!validate_bitmap_values(args->craa_type_mask))
 595                 goto out;
 596
 597         status = cpu_to_be32(NFS4_OK);
 598         if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *)
 599                      &args->craa_type_mask))
 600                 flags = FMODE_READ;
 601         if (test_bit(RCA4_TYPE_MASK_WDATA_DLG, (const unsigned long *)
 602                      &args->craa_type_mask))
 603                 flags |= FMODE_WRITE;
 604         if (test_bit(RCA4_TYPE_MASK_FILE_LAYOUT, (const unsigned long *)
 605                      &args->craa_type_mask))
 606                 pnfs_recall_all_layouts(cps->clp);
 607         if (flags)
 608                 nfs_expire_unused_delegation_types(cps->clp, flags);
 609 out:
 610         dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
 611         return status;
 612 }
 613
 614 /* Reduce the fore channel's max_slots to the target value */
 615 __be32 nfs4_callback_recallslot(void *argp, void *resp,
 616                                 struct cb_process_state *cps)
 617 {
 618         struct cb_recallslotargs *args = argp;
 619         struct nfs4_slot_table *fc_tbl;
 620         __be32 status;
 621
 622         status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
 623         if (!cps->clp) /* set in cb_sequence */
 624                 goto out;
 625
 626         dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n",
 627                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
 628                 args->crsa_target_highest_slotid);
 629
 630         fc_tbl = &cps->clp->cl_session->fc_slot_table;
 631
 632         status = htonl(NFS4_OK);
 633
 634         nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid);
 635         nfs41_notify_server(cps->clp);
 636 out:
 637         dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
 638         return status;
 639 }
 640
 641 __be32 nfs4_callback_notify_lock(void *argp, void *resp,
 642                                  struct cb_process_state *cps)
 643 {
 644         struct cb_notify_lock_args *args = argp;
 645
 646         if (!cps->clp) /* set in cb_sequence */
 647                 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
 648
 649         dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n",
 650                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
 651
 652         /* Don't wake anybody if the string looked bogus */
 653         if (args->cbnl_valid)
 654                 __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args);
 655
 656         return htonl(NFS4_OK);
 657 }
 658 #endif /* CONFIG_NFS_V4_1 */