fs/nfs/callback_proc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * linux/fs/nfs/callback_proc.c
   4  *
   5  * Copyright (C) 2004 Trond Myklebust
   6  *
   7  * NFSv4 callback procedures
   8  */
   9 #include <linux/nfs4.h>
  10 #include <linux/nfs_fs.h>
  11 #include <linux/slab.h>
  12 #include <linux/rcupdate.h>
  13 #include "nfs4_fs.h"
  14 #include "callback.h"
  15 #include "delegation.h"
  16 #include "internal.h"
  17 #include "pnfs.h"
  18 #include "nfs4session.h"
  19 #include "nfs4trace.h"
  20
  21 #define NFSDBG_FACILITY NFSDBG_CALLBACK
  22
  23 __be32 nfs4_callback_getattr(void *argp, void *resp,
  24                              struct cb_process_state *cps)
  25 {
  26         struct cb_getattrargs *args = argp;
  27         struct cb_getattrres *res = resp;
  28         struct nfs_delegation *delegation;
  29         struct nfs_inode *nfsi;
  30         struct inode *inode;
  31
  32         res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
  33         if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
  34                 goto out;
  35
  36         res->bitmap[0] = res->bitmap[1] = 0;
  37         res->status = htonl(NFS4ERR_BADHANDLE);
  38
  39         dprintk_rcu("NFS: GETATTR callback request from %s\n",
  40                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
  41
  42         inode = nfs_delegation_find_inode(cps->clp, &args->fh);
  43         if (inode == NULL) {
  44                 trace_nfs4_cb_getattr(cps->clp, &args->fh, NULL,
  45                                 -ntohl(res->status));
  46                 goto out;
  47         }
  48         nfsi = NFS_I(inode);
  49         rcu_read_lock();
  50         delegation = rcu_dereference(nfsi->delegation);
  51         if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)
  52                 goto out_iput;
  53         res->size = i_size_read(inode);
  54         res->change_attr = delegation->change_attr;
  55         if (nfs_have_writebacks(inode))
  56                 res->change_attr++;
  57         res->ctime = inode->i_ctime;
  58         res->mtime = inode->i_mtime;
  59         res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
  60                 args->bitmap[0];
  61         res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &
  62                 args->bitmap[1];
  63         res->status = 0;
  64 out_iput:
  65         rcu_read_unlock();
  66         trace_nfs4_cb_getattr(cps->clp, &args->fh, inode, -ntohl(res->status));
  67         iput(inode);
  68 out:
  69         dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
  70         return res->status;
  71 }
  72
  73 __be32 nfs4_callback_recall(void *argp, void *resp,
  74                             struct cb_process_state *cps)
  75 {
  76         struct cb_recallargs *args = argp;
  77         struct inode *inode;
  78         __be32 res;
  79
  80         res = htonl(NFS4ERR_OP_NOT_IN_SESSION);
  81         if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
  82                 goto out;
  83
  84         dprintk_rcu("NFS: RECALL callback request from %s\n",
  85                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
  86
  87         res = htonl(NFS4ERR_BADHANDLE);
  88         inode = nfs_delegation_find_inode(cps->clp, &args->fh);
  89         if (inode == NULL) {
  90                 trace_nfs4_cb_recall(cps->clp, &args->fh, NULL,
  91                                 &args->stateid, -ntohl(res));
  92                 goto out;
  93         }
  94         /* Set up a helper thread to actually return the delegation */
  95         switch (nfs_async_inode_return_delegation(inode, &args->stateid)) {
  96         case 0:
  97                 res = 0;
  98                 break;
  99         case -ENOENT:
 100                 res = htonl(NFS4ERR_BAD_STATEID);
 101                 break;
 102         default:
 103                 res = htonl(NFS4ERR_RESOURCE);
 104         }
 105         trace_nfs4_cb_recall(cps->clp, &args->fh, inode,
 106                         &args->stateid, -ntohl(res));
 107         iput(inode);
 108 out:
 109         dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
 110         return res;
 111 }
 112
 113 #if defined(CONFIG_NFS_V4_1)
 114
 115 /*
 116  * Lookup a layout inode by stateid
 117  *
 118  * Note: returns a refcount on the inode and superblock
 119  */
 120 static struct inode *nfs_layout_find_inode_by_stateid(struct nfs_client *clp,
 121                 const nfs4_stateid *stateid)
 122 {
 123         struct nfs_server *server;
 124         struct inode *inode;
 125         struct pnfs_layout_hdr *lo;
 126
 127 restart:
 128         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
 129                 list_for_each_entry(lo, &server->layouts, plh_layouts) {
 130                         if (stateid != NULL &&
 131                             !nfs4_stateid_match_other(stateid, &lo->plh_stateid))
 132                                 continue;
 133                         inode = igrab(lo->plh_inode);
 134                         if (!inode)
 135                                 continue;
 136                         if (!nfs_sb_active(inode->i_sb)) {
 137                                 rcu_read_unlock();
 138                                 spin_unlock(&clp->cl_lock);
 139                                 iput(inode);
 140                                 spin_lock(&clp->cl_lock);
 141                                 rcu_read_lock();
 142                                 goto restart;
 143                         }
 144                         return inode;
 145                 }
 146         }
 147
 148         return NULL;
 149 }
 150
 151 /*
 152  * Lookup a layout inode by filehandle.
 153  *
 154  * Note: returns a refcount on the inode and superblock
 155  *
 156  */
 157 static struct inode *nfs_layout_find_inode_by_fh(struct nfs_client *clp,
 158                 const struct nfs_fh *fh)
 159 {
 160         struct nfs_server *server;
 161         struct nfs_inode *nfsi;
 162         struct inode *inode;
 163         struct pnfs_layout_hdr *lo;
 164
 165 restart:
 166         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
 167                 list_for_each_entry(lo, &server->layouts, plh_layouts) {
 168                         nfsi = NFS_I(lo->plh_inode);
 169                         if (nfs_compare_fh(fh, &nfsi->fh))
 170                                 continue;
 171                         if (nfsi->layout != lo)
 172                                 continue;
 173                         inode = igrab(lo->plh_inode);
 174                         if (!inode)
 175                                 continue;
 176                         if (!nfs_sb_active(inode->i_sb)) {
 177                                 rcu_read_unlock();
 178                                 spin_unlock(&clp->cl_lock);
 179                                 iput(inode);
 180                                 spin_lock(&clp->cl_lock);
 181                                 rcu_read_lock();
 182                                 goto restart;
 183                         }
 184                         return inode;
 185                 }
 186         }
 187
 188         return NULL;
 189 }
 190
 191 static struct inode *nfs_layout_find_inode(struct nfs_client *clp,
 192                 const struct nfs_fh *fh,
 193                 const nfs4_stateid *stateid)
 194 {
 195         struct inode *inode;
 196
 197         spin_lock(&clp->cl_lock);
 198         rcu_read_lock();
 199         inode = nfs_layout_find_inode_by_stateid(clp, stateid);
 200         if (!inode)
 201                 inode = nfs_layout_find_inode_by_fh(clp, fh);
 202         rcu_read_unlock();
 203         spin_unlock(&clp->cl_lock);
 204
 205         return inode;
 206 }
 207
 208 /*
 209  * Enforce RFC5661 section 12.5.5.2.1. (Layout Recall and Return Sequencing)
 210  */
 211 static u32 pnfs_check_callback_stateid(struct pnfs_layout_hdr *lo,
 212                                         const nfs4_stateid *new)
 213 {
 214         u32 oldseq, newseq;
 215
 216         /* Is the stateid still not initialised? */
 217         if (!pnfs_layout_is_valid(lo))
 218                 return NFS4ERR_DELAY;
 219
 220         /* Mismatched stateid? */
 221         if (!nfs4_stateid_match_other(&lo->plh_stateid, new))
 222                 return NFS4ERR_BAD_STATEID;
 223
 224         newseq = be32_to_cpu(new->seqid);
 225         /* Are we already in a layout recall situation? */
 226         if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
 227             lo->plh_return_seq != 0) {
 228                 if (newseq < lo->plh_return_seq)
 229                         return NFS4ERR_OLD_STATEID;
 230                 if (newseq > lo->plh_return_seq)
 231                         return NFS4ERR_DELAY;
 232                 goto out;
 233         }
 234
 235         /* Check that the stateid matches what we think it should be. */
 236         oldseq = be32_to_cpu(lo->plh_stateid.seqid);
 237         if (newseq > oldseq + 1)
 238                 return NFS4ERR_DELAY;
 239         /* Crazy server! */
 240         if (newseq <= oldseq)
 241                 return NFS4ERR_OLD_STATEID;
 242 out:
 243         return NFS_OK;
 244 }
 245
 246 static u32 initiate_file_draining(struct nfs_client *clp,
 247                                   struct cb_layoutrecallargs *args)
 248 {
 249         struct inode *ino;
 250         struct pnfs_layout_hdr *lo;
 251         u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
 252         LIST_HEAD(free_me_list);
 253
 254         ino = nfs_layout_find_inode(clp, &args->cbl_fh, &args->cbl_stateid);
 255         if (!ino)
 256                 goto out;
 257
 258         pnfs_layoutcommit_inode(ino, false);
 259
 260
 261         spin_lock(&ino->i_lock);
 262         lo = NFS_I(ino)->layout;
 263         if (!lo) {
 264                 spin_unlock(&ino->i_lock);
 265                 goto out;
 266         }
 267         pnfs_get_layout_hdr(lo);
 268         rv = pnfs_check_callback_stateid(lo, &args->cbl_stateid);
 269         if (rv != NFS_OK)
 270                 goto unlock;
 271         pnfs_set_layout_stateid(lo, &args->cbl_stateid, true);
 272
 273         /*
 274          * Enforce RFC5661 Section 12.5.5.2.1.5 (Bulk Recall and Return)
 275          */
 276         if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
 277                 rv = NFS4ERR_DELAY;
 278                 goto unlock;
 279         }
 280
 281         if (pnfs_mark_matching_lsegs_return(lo, &free_me_list,
 282                                 &args->cbl_range,
 283                                 be32_to_cpu(args->cbl_stateid.seqid))) {
 284                 rv = NFS4_OK;
 285                 goto unlock;
 286         }
 287
 288         /* Embrace your forgetfulness! */
 289         rv = NFS4ERR_NOMATCHING_LAYOUT;
 290
 291         if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
 292                 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo,
 293                         &args->cbl_range);
 294         }
 295 unlock:
 296         spin_unlock(&ino->i_lock);
 297         pnfs_free_lseg_list(&free_me_list);
 298         /* Free all lsegs that are attached to commit buckets */
 299         nfs_commit_inode(ino, 0);
 300         pnfs_put_layout_hdr(lo);
 301 out:
 302         trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino,
 303                         &args->cbl_stateid, -rv);
 304         nfs_iput_and_deactive(ino);
 305         return rv;
 306 }
 307
 308 static u32 initiate_bulk_draining(struct nfs_client *clp,
 309                                   struct cb_layoutrecallargs *args)
 310 {
 311         int stat;
 312
 313         if (args->cbl_recall_type == RETURN_FSID)
 314                 stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true);
 315         else
 316                 stat = pnfs_destroy_layouts_byclid(clp, true);
 317         if (stat != 0)
 318                 return NFS4ERR_DELAY;
 319         return NFS4ERR_NOMATCHING_LAYOUT;
 320 }
 321
 322 static u32 do_callback_layoutrecall(struct nfs_client *clp,
 323                                     struct cb_layoutrecallargs *args)
 324 {
 325         if (args->cbl_recall_type == RETURN_FILE)
 326                 return initiate_file_draining(clp, args);
 327         return initiate_bulk_draining(clp, args);
 328 }
 329
 330 __be32 nfs4_callback_layoutrecall(void *argp, void *resp,
 331                                   struct cb_process_state *cps)
 332 {
 333         struct cb_layoutrecallargs *args = argp;
 334         u32 res = NFS4ERR_OP_NOT_IN_SESSION;
 335
 336         if (cps->clp)
 337                 res = do_callback_layoutrecall(cps->clp, args);
 338         return cpu_to_be32(res);
 339 }
 340
 341 static void pnfs_recall_all_layouts(struct nfs_client *clp)
 342 {
 343         struct cb_layoutrecallargs args;
 344
 345         /* Pretend we got a CB_LAYOUTRECALL(ALL) */
 346         memset(&args, 0, sizeof(args));
 347         args.cbl_recall_type = RETURN_ALL;
 348         /* FIXME we ignore errors, what should we do? */
 349         do_callback_layoutrecall(clp, &args);
 350 }
 351
 352 __be32 nfs4_callback_devicenotify(void *argp, void *resp,
 353                                   struct cb_process_state *cps)
 354 {
 355         struct cb_devicenotifyargs *args = argp;
 356         int i;
 357         __be32 res = 0;
 358         struct nfs_client *clp = cps->clp;
 359         struct nfs_server *server = NULL;
 360
 361         if (!clp) {
 362                 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
 363                 goto out;
 364         }
 365
 366         for (i = 0; i < args->ndevs; i++) {
 367                 struct cb_devicenotifyitem *dev = &args->devs[i];
 368
 369                 if (!server ||
 370                     server->pnfs_curr_ld->id != dev->cbd_layout_type) {
 371                         rcu_read_lock();
 372                         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
 373                                 if (server->pnfs_curr_ld &&
 374                                     server->pnfs_curr_ld->id == dev->cbd_layout_type) {
 375                                         rcu_read_unlock();
 376                                         goto found;
 377                                 }
 378                         rcu_read_unlock();
 379                         continue;
 380                 }
 381
 382         found:
 383                 nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id);
 384         }
 385
 386 out:
 387         kfree(args->devs);
 388         return res;
 389 }
 390
 391 /*
 392  * Validate the sequenceID sent by the server.
 393  * Return success if the sequenceID is one more than what we last saw on
 394  * this slot, accounting for wraparound.  Increments the slot's sequence.
 395  *
 396  * We don't yet implement a duplicate request cache, instead we set the
 397  * back channel ca_maxresponsesize_cached to zero. This is OK for now
 398  * since we only currently implement idempotent callbacks anyway.
 399  *
 400  * We have a single slot backchannel at this time, so we don't bother
 401  * checking the used_slots bit array on the table.  The lower layer guarantees
 402  * a single outstanding callback request at a time.
 403  */
 404 static __be32
 405 validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot,
 406                 const struct cb_sequenceargs * args)
 407 {
 408         if (args->csa_slotid > tbl->server_highest_slotid)
 409                 return htonl(NFS4ERR_BADSLOT);
 410
 411         /* Replay */
 412         if (args->csa_sequenceid == slot->seq_nr) {
 413                 if (nfs4_test_locked_slot(tbl, slot->slot_nr))
 414                         return htonl(NFS4ERR_DELAY);
 415                 /* Signal process_op to set this error on next op */
 416                 if (args->csa_cachethis == 0)
 417                         return htonl(NFS4ERR_RETRY_UNCACHED_REP);
 418
 419                 /* Liar! We never allowed you to set csa_cachethis != 0 */
 420                 return htonl(NFS4ERR_SEQ_FALSE_RETRY);
 421         }
 422
 423         /* Wraparound */
 424         if (unlikely(slot->seq_nr == 0xFFFFFFFFU)) {
 425                 if (args->csa_sequenceid == 1)
 426                         return htonl(NFS4_OK);
 427         } else if (likely(args->csa_sequenceid == slot->seq_nr + 1))
 428                 return htonl(NFS4_OK);
 429
 430         /* Misordered request */
 431         return htonl(NFS4ERR_SEQ_MISORDERED);
 432 }
 433
 434 /*
 435  * For each referring call triple, check the session's slot table for
 436  * a match.  If the slot is in use and the sequence numbers match, the
 437  * client is still waiting for a response to the original request.
 438  */
 439 static bool referring_call_exists(struct nfs_client *clp,
 440                                   uint32_t nrclists,
 441                                   struct referring_call_list *rclists)
 442 {
 443         bool status = false;
 444         int i, j;
 445         struct nfs4_session *session;
 446         struct nfs4_slot_table *tbl;
 447         struct referring_call_list *rclist;
 448         struct referring_call *ref;
 449
 450         /*
 451          * XXX When client trunking is implemented, this becomes
 452          * a session lookup from within the loop
 453          */
 454         session = clp->cl_session;
 455         tbl = &session->fc_slot_table;
 456
 457         for (i = 0; i < nrclists; i++) {
 458                 rclist = &rclists[i];
 459                 if (memcmp(session->sess_id.data,
 460                            rclist->rcl_sessionid.data,
 461                            NFS4_MAX_SESSIONID_LEN) != 0)
 462                         continue;
 463
 464                 for (j = 0; j < rclist->rcl_nrefcalls; j++) {
 465                         ref = &rclist->rcl_refcalls[j];
 466                         status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid,
 467                                         ref->rc_sequenceid, HZ >> 1) < 0;
 468                         if (status)
 469                                 goto out;
 470                 }
 471         }
 472
 473 out:
 474         return status;
 475 }
 476
 477 __be32 nfs4_callback_sequence(void *argp, void *resp,
 478                               struct cb_process_state *cps)
 479 {
 480         struct cb_sequenceargs *args = argp;
 481         struct cb_sequenceres *res = resp;
 482         struct nfs4_slot_table *tbl;
 483         struct nfs4_slot *slot;
 484         struct nfs_client *clp;
 485         int i;
 486         __be32 status = htonl(NFS4ERR_BADSESSION);
 487
 488         clp = nfs4_find_client_sessionid(cps->net, args->csa_addr,
 489                                          &args->csa_sessionid, cps->minorversion);
 490         if (clp == NULL)
 491                 goto out;
 492
 493         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
 494                 goto out;
 495
 496         tbl = &clp->cl_session->bc_slot_table;
 497
 498         /* Set up res before grabbing the spinlock */
 499         memcpy(&res->csr_sessionid, &args->csa_sessionid,
 500                sizeof(res->csr_sessionid));
 501         res->csr_sequenceid = args->csa_sequenceid;
 502         res->csr_slotid = args->csa_slotid;
 503
 504         spin_lock(&tbl->slot_tbl_lock);
 505         /* state manager is resetting the session */
 506         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
 507                 status = htonl(NFS4ERR_DELAY);
 508                 /* Return NFS4ERR_BADSESSION if we're draining the session
 509                  * in order to reset it.
 510                  */
 511                 if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
 512                         status = htonl(NFS4ERR_BADSESSION);
 513                 goto out_unlock;
 514         }
 515
 516         status = htonl(NFS4ERR_BADSLOT);
 517         slot = nfs4_lookup_slot(tbl, args->csa_slotid);
 518         if (IS_ERR(slot))
 519                 goto out_unlock;
 520
 521         res->csr_highestslotid = tbl->server_highest_slotid;
 522         res->csr_target_highestslotid = tbl->target_highest_slotid;
 523
 524         status = validate_seqid(tbl, slot, args);
 525         if (status)
 526                 goto out_unlock;
 527         if (!nfs4_try_to_lock_slot(tbl, slot)) {
 528                 status = htonl(NFS4ERR_DELAY);
 529                 goto out_unlock;
 530         }
 531         cps->slot = slot;
 532
 533         /* The ca_maxresponsesize_cached is 0 with no DRC */
 534         if (args->csa_cachethis != 0) {
 535                 status = htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
 536                 goto out_unlock;
 537         }
 538
 539         /*
 540          * Check for pending referring calls.  If a match is found, a
 541          * related callback was received before the response to the original
 542          * call.
 543          */
 544         if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) {
 545                 status = htonl(NFS4ERR_DELAY);
 546                 goto out_unlock;
 547         }
 548
 549         /*
 550          * RFC5661 20.9.3
 551          * If CB_SEQUENCE returns an error, then the state of the slot
 552          * (sequence ID, cached reply) MUST NOT change.
 553          */
 554         slot->seq_nr = args->csa_sequenceid;
 555 out_unlock:
 556         spin_unlock(&tbl->slot_tbl_lock);
 557
 558 out:
 559         cps->clp = clp; /* put in nfs4_callback_compound */
 560         for (i = 0; i < args->csa_nrclists; i++)
 561                 kfree(args->csa_rclists[i].rcl_refcalls);
 562         kfree(args->csa_rclists);
 563
 564         if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
 565                 cps->drc_status = status;
 566                 status = 0;
 567         } else
 568                 res->csr_status = status;
 569
 570         trace_nfs4_cb_sequence(args, res, status);
 571         return status;
 572 }
 573
 574 static bool
 575 validate_bitmap_values(unsigned long mask)
 576 {
 577         return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
 578 }
 579
 580 __be32 nfs4_callback_recallany(void *argp, void *resp,
 581                                struct cb_process_state *cps)
 582 {
 583         struct cb_recallanyargs *args = argp;
 584         __be32 status;
 585         fmode_t flags = 0;
 586
 587         status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
 588         if (!cps->clp) /* set in cb_sequence */
 589                 goto out;
 590
 591         dprintk_rcu("NFS: RECALL_ANY callback request from %s\n",
 592                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
 593
 594         status = cpu_to_be32(NFS4ERR_INVAL);
 595         if (!validate_bitmap_values(args->craa_type_mask))
 596                 goto out;
 597
 598         status = cpu_to_be32(NFS4_OK);
 599         if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *)
 600                      &args->craa_type_mask))
 601                 flags = FMODE_READ;
 602         if (test_bit(RCA4_TYPE_MASK_WDATA_DLG, (const unsigned long *)
 603                      &args->craa_type_mask))
 604                 flags |= FMODE_WRITE;
 605         if (test_bit(RCA4_TYPE_MASK_FILE_LAYOUT, (const unsigned long *)
 606                      &args->craa_type_mask))
 607                 pnfs_recall_all_layouts(cps->clp);
 608         if (flags)
 609                 nfs_expire_unused_delegation_types(cps->clp, flags);
 610 out:
 611         dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
 612         return status;
 613 }
 614
 615 /* Reduce the fore channel's max_slots to the target value */
 616 __be32 nfs4_callback_recallslot(void *argp, void *resp,
 617                                 struct cb_process_state *cps)
 618 {
 619         struct cb_recallslotargs *args = argp;
 620         struct nfs4_slot_table *fc_tbl;
 621         __be32 status;
 622
 623         status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
 624         if (!cps->clp) /* set in cb_sequence */
 625                 goto out;
 626
 627         dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n",
 628                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
 629                 args->crsa_target_highest_slotid);
 630
 631         fc_tbl = &cps->clp->cl_session->fc_slot_table;
 632
 633         status = htonl(NFS4_OK);
 634
 635         nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid);
 636         nfs41_notify_server(cps->clp);
 637 out:
 638         dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
 639         return status;
 640 }
 641
 642 __be32 nfs4_callback_notify_lock(void *argp, void *resp,
 643                                  struct cb_process_state *cps)
 644 {
 645         struct cb_notify_lock_args *args = argp;
 646
 647         if (!cps->clp) /* set in cb_sequence */
 648                 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
 649
 650         dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n",
 651                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
 652
 653         /* Don't wake anybody if the string looked bogus */
 654         if (args->cbnl_valid)
 655                 __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args);
 656
 657         return htonl(NFS4_OK);
 658 }
 659 #endif /* CONFIG_NFS_V4_1 */