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_lock();
 135                                 spin_unlock(&clp->cl_lock);
 136                                 iput(inode);
 137                                 spin_lock(&clp->cl_lock);
 138                                 goto restart;
 139                         }
 140                         return inode;
 141                 }
 142         }
 143
 144         return NULL;
 145 }
 146
 147 /*
 148  * Lookup a layout inode by filehandle.
 149  *
 150  * Note: returns a refcount on the inode and superblock
 151  *
 152  */
 153 static struct inode *nfs_layout_find_inode_by_fh(struct nfs_client *clp,
 154                 const struct nfs_fh *fh)
 155 {
 156         struct nfs_server *server;
 157         struct nfs_inode *nfsi;
 158         struct inode *inode;
 159         struct pnfs_layout_hdr *lo;
 160
 161 restart:
 162         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
 163                 list_for_each_entry(lo, &server->layouts, plh_layouts) {
 164                         nfsi = NFS_I(lo->plh_inode);
 165                         if (nfs_compare_fh(fh, &nfsi->fh))
 166                                 continue;
 167                         if (nfsi->layout != lo)
 168                                 continue;
 169                         inode = igrab(lo->plh_inode);
 170                         if (!inode)
 171                                 continue;
 172                         if (!nfs_sb_active(inode->i_sb)) {
 173                                 rcu_read_lock();
 174                                 spin_unlock(&clp->cl_lock);
 175                                 iput(inode);
 176                                 spin_lock(&clp->cl_lock);
 177                                 goto restart;
 178                         }
 179                         return inode;
 180                 }
 181         }
 182
 183         return NULL;
 184 }
 185
 186 static struct inode *nfs_layout_find_inode(struct nfs_client *clp,
 187                 const struct nfs_fh *fh,
 188                 const nfs4_stateid *stateid)
 189 {
 190         struct inode *inode;
 191
 192         spin_lock(&clp->cl_lock);
 193         rcu_read_lock();
 194         inode = nfs_layout_find_inode_by_stateid(clp, stateid);
 195         if (!inode)
 196                 inode = nfs_layout_find_inode_by_fh(clp, fh);
 197         rcu_read_unlock();
 198         spin_unlock(&clp->cl_lock);
 199
 200         return inode;
 201 }
 202
 203 /*
 204  * Enforce RFC5661 section 12.5.5.2.1. (Layout Recall and Return Sequencing)
 205  */
 206 static u32 pnfs_check_callback_stateid(struct pnfs_layout_hdr *lo,
 207                                         const nfs4_stateid *new)
 208 {
 209         u32 oldseq, newseq;
 210
 211         /* Is the stateid still not initialised? */
 212         if (!pnfs_layout_is_valid(lo))
 213                 return NFS4ERR_DELAY;
 214
 215         /* Mismatched stateid? */
 216         if (!nfs4_stateid_match_other(&lo->plh_stateid, new))
 217                 return NFS4ERR_BAD_STATEID;
 218
 219         newseq = be32_to_cpu(new->seqid);
 220         /* Are we already in a layout recall situation? */
 221         if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
 222             lo->plh_return_seq != 0) {
 223                 if (newseq < lo->plh_return_seq)
 224                         return NFS4ERR_OLD_STATEID;
 225                 if (newseq > lo->plh_return_seq)
 226                         return NFS4ERR_DELAY;
 227                 goto out;
 228         }
 229
 230         /* Check that the stateid matches what we think it should be. */
 231         oldseq = be32_to_cpu(lo->plh_stateid.seqid);
 232         if (newseq > oldseq + 1)
 233                 return NFS4ERR_DELAY;
 234         /* Crazy server! */
 235         if (newseq <= oldseq)
 236                 return NFS4ERR_OLD_STATEID;
 237 out:
 238         return NFS_OK;
 239 }
 240
 241 static u32 initiate_file_draining(struct nfs_client *clp,
 242                                   struct cb_layoutrecallargs *args)
 243 {
 244         struct inode *ino;
 245         struct pnfs_layout_hdr *lo;
 246         u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
 247         LIST_HEAD(free_me_list);
 248
 249         ino = nfs_layout_find_inode(clp, &args->cbl_fh, &args->cbl_stateid);
 250         if (!ino)
 251                 goto out;
 252
 253         pnfs_layoutcommit_inode(ino, false);
 254
 255
 256         spin_lock(&ino->i_lock);
 257         lo = NFS_I(ino)->layout;
 258         if (!lo) {
 259                 spin_unlock(&ino->i_lock);
 260                 goto out;
 261         }
 262         pnfs_get_layout_hdr(lo);
 263         rv = pnfs_check_callback_stateid(lo, &args->cbl_stateid);
 264         if (rv != NFS_OK)
 265                 goto unlock;
 266         pnfs_set_layout_stateid(lo, &args->cbl_stateid, true);
 267
 268         /*
 269          * Enforce RFC5661 Section 12.5.5.2.1.5 (Bulk Recall and Return)
 270          */
 271         if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
 272                 rv = NFS4ERR_DELAY;
 273                 goto unlock;
 274         }
 275
 276         if (pnfs_mark_matching_lsegs_return(lo, &free_me_list,
 277                                 &args->cbl_range,
 278                                 be32_to_cpu(args->cbl_stateid.seqid))) {
 279                 rv = NFS4_OK;
 280                 goto unlock;
 281         }
 282
 283         /* Embrace your forgetfulness! */
 284         rv = NFS4ERR_NOMATCHING_LAYOUT;
 285
 286         if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
 287                 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo,
 288                         &args->cbl_range);
 289         }
 290 unlock:
 291         spin_unlock(&ino->i_lock);
 292         pnfs_free_lseg_list(&free_me_list);
 293         /* Free all lsegs that are attached to commit buckets */
 294         nfs_commit_inode(ino, 0);
 295         pnfs_put_layout_hdr(lo);
 296 out:
 297         trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino,
 298                         &args->cbl_stateid, -rv);
 299         nfs_iput_and_deactive(ino);
 300         return rv;
 301 }
 302
 303 static u32 initiate_bulk_draining(struct nfs_client *clp,
 304                                   struct cb_layoutrecallargs *args)
 305 {
 306         int stat;
 307
 308         if (args->cbl_recall_type == RETURN_FSID)
 309                 stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true);
 310         else
 311                 stat = pnfs_destroy_layouts_byclid(clp, true);
 312         if (stat != 0)
 313                 return NFS4ERR_DELAY;
 314         return NFS4ERR_NOMATCHING_LAYOUT;
 315 }
 316
 317 static u32 do_callback_layoutrecall(struct nfs_client *clp,
 318                                     struct cb_layoutrecallargs *args)
 319 {
 320         u32 res;
 321
 322         dprintk("%s enter, type=%i\n", __func__, args->cbl_recall_type);
 323         if (args->cbl_recall_type == RETURN_FILE)
 324                 res = initiate_file_draining(clp, args);
 325         else
 326                 res = initiate_bulk_draining(clp, args);
 327         dprintk("%s returning %i\n", __func__, res);
 328         return res;
 329
 330 }
 331
 332 __be32 nfs4_callback_layoutrecall(struct cb_layoutrecallargs *args,
 333                                   void *dummy, struct cb_process_state *cps)
 334 {
 335         u32 res;
 336
 337         dprintk("%s: -->\n", __func__);
 338
 339         if (cps->clp)
 340                 res = do_callback_layoutrecall(cps->clp, args);
 341         else
 342                 res = NFS4ERR_OP_NOT_IN_SESSION;
 343
 344         dprintk("%s: exit with status = %d\n", __func__, res);
 345         return cpu_to_be32(res);
 346 }
 347
 348 static void pnfs_recall_all_layouts(struct nfs_client *clp)
 349 {
 350         struct cb_layoutrecallargs args;
 351
 352         /* Pretend we got a CB_LAYOUTRECALL(ALL) */
 353         memset(&args, 0, sizeof(args));
 354         args.cbl_recall_type = RETURN_ALL;
 355         /* FIXME we ignore errors, what should we do? */
 356         do_callback_layoutrecall(clp, &args);
 357 }
 358
 359 __be32 nfs4_callback_devicenotify(struct cb_devicenotifyargs *args,
 360                                   void *dummy, struct cb_process_state *cps)
 361 {
 362         int i;
 363         __be32 res = 0;
 364         struct nfs_client *clp = cps->clp;
 365         struct nfs_server *server = NULL;
 366
 367         dprintk("%s: -->\n", __func__);
 368
 369         if (!clp) {
 370                 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
 371                 goto out;
 372         }
 373
 374         for (i = 0; i < args->ndevs; i++) {
 375                 struct cb_devicenotifyitem *dev = &args->devs[i];
 376
 377                 if (!server ||
 378                     server->pnfs_curr_ld->id != dev->cbd_layout_type) {
 379                         rcu_read_lock();
 380                         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
 381                                 if (server->pnfs_curr_ld &&
 382                                     server->pnfs_curr_ld->id == dev->cbd_layout_type) {
 383                                         rcu_read_unlock();
 384                                         goto found;
 385                                 }
 386                         rcu_read_unlock();
 387                         dprintk("%s: layout type %u not found\n",
 388                                 __func__, dev->cbd_layout_type);
 389                         continue;
 390                 }
 391
 392         found:
 393                 nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id);
 394         }
 395
 396 out:
 397         kfree(args->devs);
 398         dprintk("%s: exit with status = %u\n",
 399                 __func__, be32_to_cpu(res));
 400         return res;
 401 }
 402
 403 /*
 404  * Validate the sequenceID sent by the server.
 405  * Return success if the sequenceID is one more than what we last saw on
 406  * this slot, accounting for wraparound.  Increments the slot's sequence.
 407  *
 408  * We don't yet implement a duplicate request cache, instead we set the
 409  * back channel ca_maxresponsesize_cached to zero. This is OK for now
 410  * since we only currently implement idempotent callbacks anyway.
 411  *
 412  * We have a single slot backchannel at this time, so we don't bother
 413  * checking the used_slots bit array on the table.  The lower layer guarantees
 414  * a single outstanding callback request at a time.
 415  */
 416 static __be32
 417 validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot,
 418                 const struct cb_sequenceargs * args)
 419 {
 420         dprintk("%s enter. slotid %u seqid %u, slot table seqid: %u\n",
 421                 __func__, args->csa_slotid, args->csa_sequenceid, slot->seq_nr);
 422
 423         if (args->csa_slotid > tbl->server_highest_slotid)
 424                 return htonl(NFS4ERR_BADSLOT);
 425
 426         /* Replay */
 427         if (args->csa_sequenceid == slot->seq_nr) {
 428                 dprintk("%s seqid %u is a replay\n",
 429                         __func__, args->csa_sequenceid);
 430                 if (nfs4_test_locked_slot(tbl, slot->slot_nr))
 431                         return htonl(NFS4ERR_DELAY);
 432                 /* Signal process_op to set this error on next op */
 433                 if (args->csa_cachethis == 0)
 434                         return htonl(NFS4ERR_RETRY_UNCACHED_REP);
 435
 436                 /* Liar! We never allowed you to set csa_cachethis != 0 */
 437                 return htonl(NFS4ERR_SEQ_FALSE_RETRY);
 438         }
 439
 440         /* Wraparound */
 441         if (unlikely(slot->seq_nr == 0xFFFFFFFFU)) {
 442                 if (args->csa_sequenceid == 1)
 443                         return htonl(NFS4_OK);
 444         } else if (likely(args->csa_sequenceid == slot->seq_nr + 1))
 445                 return htonl(NFS4_OK);
 446
 447         /* Misordered request */
 448         return htonl(NFS4ERR_SEQ_MISORDERED);
 449 }
 450
 451 /*
 452  * For each referring call triple, check the session's slot table for
 453  * a match.  If the slot is in use and the sequence numbers match, the
 454  * client is still waiting for a response to the original request.
 455  */
 456 static bool referring_call_exists(struct nfs_client *clp,
 457                                   uint32_t nrclists,
 458                                   struct referring_call_list *rclists)
 459 {
 460         bool status = 0;
 461         int i, j;
 462         struct nfs4_session *session;
 463         struct nfs4_slot_table *tbl;
 464         struct referring_call_list *rclist;
 465         struct referring_call *ref;
 466
 467         /*
 468          * XXX When client trunking is implemented, this becomes
 469          * a session lookup from within the loop
 470          */
 471         session = clp->cl_session;
 472         tbl = &session->fc_slot_table;
 473
 474         for (i = 0; i < nrclists; i++) {
 475                 rclist = &rclists[i];
 476                 if (memcmp(session->sess_id.data,
 477                            rclist->rcl_sessionid.data,
 478                            NFS4_MAX_SESSIONID_LEN) != 0)
 479                         continue;
 480
 481                 for (j = 0; j < rclist->rcl_nrefcalls; j++) {
 482                         ref = &rclist->rcl_refcalls[j];
 483
 484                         dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u "
 485                                 "slotid %u\n", __func__,
 486                                 ((u32 *)&rclist->rcl_sessionid.data)[0],
 487                                 ((u32 *)&rclist->rcl_sessionid.data)[1],
 488                                 ((u32 *)&rclist->rcl_sessionid.data)[2],
 489                                 ((u32 *)&rclist->rcl_sessionid.data)[3],
 490                                 ref->rc_sequenceid, ref->rc_slotid);
 491
 492                         status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid,
 493                                         ref->rc_sequenceid, HZ >> 1) < 0;
 494                         if (status)
 495                                 goto out;
 496                 }
 497         }
 498
 499 out:
 500         return status;
 501 }
 502
 503 __be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
 504                               struct cb_sequenceres *res,
 505                               struct cb_process_state *cps)
 506 {
 507         struct nfs4_slot_table *tbl;
 508         struct nfs4_slot *slot;
 509         struct nfs_client *clp;
 510         int i;
 511         __be32 status = htonl(NFS4ERR_BADSESSION);
 512
 513         clp = nfs4_find_client_sessionid(cps->net, args->csa_addr,
 514                                          &args->csa_sessionid, cps->minorversion);
 515         if (clp == NULL)
 516                 goto out;
 517
 518         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
 519                 goto out;
 520
 521         tbl = &clp->cl_session->bc_slot_table;
 522
 523         /* Set up res before grabbing the spinlock */
 524         memcpy(&res->csr_sessionid, &args->csa_sessionid,
 525                sizeof(res->csr_sessionid));
 526         res->csr_sequenceid = args->csa_sequenceid;
 527         res->csr_slotid = args->csa_slotid;
 528
 529         spin_lock(&tbl->slot_tbl_lock);
 530         /* state manager is resetting the session */
 531         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
 532                 status = htonl(NFS4ERR_DELAY);
 533                 /* Return NFS4ERR_BADSESSION if we're draining the session
 534                  * in order to reset it.
 535                  */
 536                 if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
 537                         status = htonl(NFS4ERR_BADSESSION);
 538                 goto out_unlock;
 539         }
 540
 541         status = htonl(NFS4ERR_BADSLOT);
 542         slot = nfs4_lookup_slot(tbl, args->csa_slotid);
 543         if (IS_ERR(slot))
 544                 goto out_unlock;
 545
 546         res->csr_highestslotid = tbl->server_highest_slotid;
 547         res->csr_target_highestslotid = tbl->target_highest_slotid;
 548
 549         status = validate_seqid(tbl, slot, args);
 550         if (status)
 551                 goto out_unlock;
 552         if (!nfs4_try_to_lock_slot(tbl, slot)) {
 553                 status = htonl(NFS4ERR_DELAY);
 554                 goto out_unlock;
 555         }
 556         cps->slot = slot;
 557
 558         /* The ca_maxresponsesize_cached is 0 with no DRC */
 559         if (args->csa_cachethis != 0) {
 560                 status = htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
 561                 goto out_unlock;
 562         }
 563
 564         /*
 565          * Check for pending referring calls.  If a match is found, a
 566          * related callback was received before the response to the original
 567          * call.
 568          */
 569         if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) {
 570                 status = htonl(NFS4ERR_DELAY);
 571                 goto out_unlock;
 572         }
 573
 574         /*
 575          * RFC5661 20.9.3
 576          * If CB_SEQUENCE returns an error, then the state of the slot
 577          * (sequence ID, cached reply) MUST NOT change.
 578          */
 579         slot->seq_nr = args->csa_sequenceid;
 580 out_unlock:
 581         spin_unlock(&tbl->slot_tbl_lock);
 582
 583 out:
 584         cps->clp = clp; /* put in nfs4_callback_compound */
 585         for (i = 0; i < args->csa_nrclists; i++)
 586                 kfree(args->csa_rclists[i].rcl_refcalls);
 587         kfree(args->csa_rclists);
 588
 589         if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
 590                 cps->drc_status = status;
 591                 status = 0;
 592         } else
 593                 res->csr_status = status;
 594
 595         trace_nfs4_cb_sequence(args, res, status);
 596         dprintk("%s: exit with status = %d res->csr_status %d\n", __func__,
 597                 ntohl(status), ntohl(res->csr_status));
 598         return status;
 599 }
 600
 601 static bool
 602 validate_bitmap_values(unsigned long mask)
 603 {
 604         return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
 605 }
 606
 607 __be32 nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy,
 608                                struct cb_process_state *cps)
 609 {
 610         __be32 status;
 611         fmode_t flags = 0;
 612
 613         status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
 614         if (!cps->clp) /* set in cb_sequence */
 615                 goto out;
 616
 617         dprintk_rcu("NFS: RECALL_ANY callback request from %s\n",
 618                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
 619
 620         status = cpu_to_be32(NFS4ERR_INVAL);
 621         if (!validate_bitmap_values(args->craa_type_mask))
 622                 goto out;
 623
 624         status = cpu_to_be32(NFS4_OK);
 625         if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *)
 626                      &args->craa_type_mask))
 627                 flags = FMODE_READ;
 628         if (test_bit(RCA4_TYPE_MASK_WDATA_DLG, (const unsigned long *)
 629                      &args->craa_type_mask))
 630                 flags |= FMODE_WRITE;
 631         if (test_bit(RCA4_TYPE_MASK_FILE_LAYOUT, (const unsigned long *)
 632                      &args->craa_type_mask))
 633                 pnfs_recall_all_layouts(cps->clp);
 634         if (flags)
 635                 nfs_expire_unused_delegation_types(cps->clp, flags);
 636 out:
 637         dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
 638         return status;
 639 }
 640
 641 /* Reduce the fore channel's max_slots to the target value */
 642 __be32 nfs4_callback_recallslot(struct cb_recallslotargs *args, void *dummy,
 643                                 struct cb_process_state *cps)
 644 {
 645         struct nfs4_slot_table *fc_tbl;
 646         __be32 status;
 647
 648         status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
 649         if (!cps->clp) /* set in cb_sequence */
 650                 goto out;
 651
 652         dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n",
 653                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
 654                 args->crsa_target_highest_slotid);
 655
 656         fc_tbl = &cps->clp->cl_session->fc_slot_table;
 657
 658         status = htonl(NFS4_OK);
 659
 660         nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid);
 661         nfs41_notify_server(cps->clp);
 662 out:
 663         dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
 664         return status;
 665 }
 666
 667 __be32 nfs4_callback_notify_lock(struct cb_notify_lock_args *args, void *dummy,
 668                                  struct cb_process_state *cps)
 669 {
 670         if (!cps->clp) /* set in cb_sequence */
 671                 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
 672
 673         dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n",
 674                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
 675
 676         /* Don't wake anybody if the string looked bogus */
 677         if (args->cbnl_valid)
 678                 __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args);
 679
 680         return htonl(NFS4_OK);
 681 }
 682 #endif /* CONFIG_NFS_V4_1 */