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 (IS_ERR(inode)) {
  44                 if (inode == ERR_PTR(-EAGAIN))
  45                         res->status = htonl(NFS4ERR_DELAY);
  46                 trace_nfs4_cb_getattr(cps->clp, &args->fh, NULL,
  47                                 -ntohl(res->status));
  48                 goto out;
  49         }
  50         nfsi = NFS_I(inode);
  51         rcu_read_lock();
  52         delegation = rcu_dereference(nfsi->delegation);
  53         if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)
  54                 goto out_iput;
  55         res->size = i_size_read(inode);
  56         res->change_attr = delegation->change_attr;
  57         if (nfs_have_writebacks(inode))
  58                 res->change_attr++;
  59         res->ctime = timespec64_to_timespec(inode->i_ctime);
  60         res->mtime = timespec64_to_timespec(inode->i_mtime);
  61         res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
  62                 args->bitmap[0];
  63         res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &
  64                 args->bitmap[1];
  65         res->status = 0;
  66 out_iput:
  67         rcu_read_unlock();
  68         trace_nfs4_cb_getattr(cps->clp, &args->fh, inode, -ntohl(res->status));
  69         nfs_iput_and_deactive(inode);
  70 out:
  71         dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
  72         return res->status;
  73 }
  74
  75 __be32 nfs4_callback_recall(void *argp, void *resp,
  76                             struct cb_process_state *cps)
  77 {
  78         struct cb_recallargs *args = argp;
  79         struct inode *inode;
  80         __be32 res;
  81
  82         res = htonl(NFS4ERR_OP_NOT_IN_SESSION);
  83         if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
  84                 goto out;
  85
  86         dprintk_rcu("NFS: RECALL callback request from %s\n",
  87                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
  88
  89         res = htonl(NFS4ERR_BADHANDLE);
  90         inode = nfs_delegation_find_inode(cps->clp, &args->fh);
  91         if (IS_ERR(inode)) {
  92                 if (inode == ERR_PTR(-EAGAIN))
  93                         res = htonl(NFS4ERR_DELAY);
  94                 trace_nfs4_cb_recall(cps->clp, &args->fh, NULL,
  95                                 &args->stateid, -ntohl(res));
  96                 goto out;
  97         }
  98         /* Set up a helper thread to actually return the delegation */
  99         switch (nfs_async_inode_return_delegation(inode, &args->stateid)) {
 100         case 0:
 101                 res = 0;
 102                 break;
 103         case -ENOENT:
 104                 res = htonl(NFS4ERR_BAD_STATEID);
 105                 break;
 106         default:
 107                 res = htonl(NFS4ERR_RESOURCE);
 108         }
 109         trace_nfs4_cb_recall(cps->clp, &args->fh, inode,
 110                         &args->stateid, -ntohl(res));
 111         nfs_iput_and_deactive(inode);
 112 out:
 113         dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
 114         return res;
 115 }
 116
 117 #if defined(CONFIG_NFS_V4_1)
 118
 119 /*
 120  * Lookup a layout inode by stateid
 121  *
 122  * Note: returns a refcount on the inode and superblock
 123  */
 124 static struct inode *nfs_layout_find_inode_by_stateid(struct nfs_client *clp,
 125                 const nfs4_stateid *stateid)
 126 {
 127         struct nfs_server *server;
 128         struct inode *inode;
 129         struct pnfs_layout_hdr *lo;
 130
 131         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
 132                 list_for_each_entry(lo, &server->layouts, plh_layouts) {
 133                         if (stateid != NULL &&
 134                             !nfs4_stateid_match_other(stateid, &lo->plh_stateid))
 135                                 continue;
 136                         inode = igrab(lo->plh_inode);
 137                         if (!inode)
 138                                 return ERR_PTR(-EAGAIN);
 139                         if (!nfs_sb_active(inode->i_sb)) {
 140                                 rcu_read_unlock();
 141                                 spin_unlock(&clp->cl_lock);
 142                                 iput(inode);
 143                                 spin_lock(&clp->cl_lock);
 144                                 rcu_read_lock();
 145                                 return ERR_PTR(-EAGAIN);
 146                         }
 147                         return inode;
 148                 }
 149         }
 150
 151         return ERR_PTR(-ENOENT);
 152 }
 153
 154 /*
 155  * Lookup a layout inode by filehandle.
 156  *
 157  * Note: returns a refcount on the inode and superblock
 158  *
 159  */
 160 static struct inode *nfs_layout_find_inode_by_fh(struct nfs_client *clp,
 161                 const struct nfs_fh *fh)
 162 {
 163         struct nfs_server *server;
 164         struct nfs_inode *nfsi;
 165         struct inode *inode;
 166         struct pnfs_layout_hdr *lo;
 167
 168         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
 169                 list_for_each_entry(lo, &server->layouts, plh_layouts) {
 170                         nfsi = NFS_I(lo->plh_inode);
 171                         if (nfs_compare_fh(fh, &nfsi->fh))
 172                                 continue;
 173                         if (nfsi->layout != lo)
 174                                 continue;
 175                         inode = igrab(lo->plh_inode);
 176                         if (!inode)
 177                                 return ERR_PTR(-EAGAIN);
 178                         if (!nfs_sb_active(inode->i_sb)) {
 179                                 rcu_read_unlock();
 180                                 spin_unlock(&clp->cl_lock);
 181                                 iput(inode);
 182                                 spin_lock(&clp->cl_lock);
 183                                 rcu_read_lock();
 184                                 return ERR_PTR(-EAGAIN);
 185                         }
 186                         return inode;
 187                 }
 188         }
 189
 190         return ERR_PTR(-ENOENT);
 191 }
 192
 193 static struct inode *nfs_layout_find_inode(struct nfs_client *clp,
 194                 const struct nfs_fh *fh,
 195                 const nfs4_stateid *stateid)
 196 {
 197         struct inode *inode;
 198
 199         spin_lock(&clp->cl_lock);
 200         rcu_read_lock();
 201         inode = nfs_layout_find_inode_by_stateid(clp, stateid);
 202         if (inode == ERR_PTR(-ENOENT))
 203                 inode = nfs_layout_find_inode_by_fh(clp, fh);
 204         rcu_read_unlock();
 205         spin_unlock(&clp->cl_lock);
 206
 207         return inode;
 208 }
 209
 210 /*
 211  * Enforce RFC5661 section 12.5.5.2.1. (Layout Recall and Return Sequencing)
 212  */
 213 static u32 pnfs_check_callback_stateid(struct pnfs_layout_hdr *lo,
 214                                         const nfs4_stateid *new)
 215 {
 216         u32 oldseq, newseq;
 217
 218         /* Is the stateid not initialised? */
 219         if (!pnfs_layout_is_valid(lo))
 220                 return NFS4ERR_NOMATCHING_LAYOUT;
 221
 222         /* Mismatched stateid? */
 223         if (!nfs4_stateid_match_other(&lo->plh_stateid, new))
 224                 return NFS4ERR_BAD_STATEID;
 225
 226         newseq = be32_to_cpu(new->seqid);
 227         /* Are we already in a layout recall situation? */
 228         if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
 229             lo->plh_return_seq != 0) {
 230                 if (newseq < lo->plh_return_seq)
 231                         return NFS4ERR_OLD_STATEID;
 232                 if (newseq > lo->plh_return_seq)
 233                         return NFS4ERR_DELAY;
 234                 goto out;
 235         }
 236
 237         /* Check that the stateid matches what we think it should be. */
 238         oldseq = be32_to_cpu(lo->plh_stateid.seqid);
 239         if (newseq > oldseq + 1)
 240                 return NFS4ERR_DELAY;
 241         /* Crazy server! */
 242         if (newseq <= oldseq)
 243                 return NFS4ERR_OLD_STATEID;
 244 out:
 245         return NFS_OK;
 246 }
 247
 248 static u32 initiate_file_draining(struct nfs_client *clp,
 249                                   struct cb_layoutrecallargs *args)
 250 {
 251         struct inode *ino;
 252         struct pnfs_layout_hdr *lo;
 253         u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
 254         LIST_HEAD(free_me_list);
 255
 256         ino = nfs_layout_find_inode(clp, &args->cbl_fh, &args->cbl_stateid);
 257         if (IS_ERR(ino)) {
 258                 if (ino == ERR_PTR(-EAGAIN))
 259                         rv = NFS4ERR_DELAY;
 260                 goto out_noput;
 261         }
 262
 263         pnfs_layoutcommit_inode(ino, false);
 264
 265
 266         spin_lock(&ino->i_lock);
 267         lo = NFS_I(ino)->layout;
 268         if (!lo) {
 269                 spin_unlock(&ino->i_lock);
 270                 goto out;
 271         }
 272         pnfs_get_layout_hdr(lo);
 273         rv = pnfs_check_callback_stateid(lo, &args->cbl_stateid);
 274         if (rv != NFS_OK)
 275                 goto unlock;
 276
 277         /*
 278          * Enforce RFC5661 Section 12.5.5.2.1.5 (Bulk Recall and Return)
 279          */
 280         if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
 281                 rv = NFS4ERR_DELAY;
 282                 goto unlock;
 283         }
 284
 285         pnfs_set_layout_stateid(lo, &args->cbl_stateid, true);
 286         switch (pnfs_mark_matching_lsegs_return(lo, &free_me_list,
 287                                 &args->cbl_range,
 288                                 be32_to_cpu(args->cbl_stateid.seqid))) {
 289         case 0:
 290         case -EBUSY:
 291                 /* There are layout segments that need to be returned */
 292                 rv = NFS4_OK;
 293                 break;
 294         case -ENOENT:
 295                 /* Embrace your forgetfulness! */
 296                 rv = NFS4ERR_NOMATCHING_LAYOUT;
 297
 298                 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
 299                         NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo,
 300                                 &args->cbl_range);
 301                 }
 302         }
 303 unlock:
 304         spin_unlock(&ino->i_lock);
 305         pnfs_free_lseg_list(&free_me_list);
 306         /* Free all lsegs that are attached to commit buckets */
 307         nfs_commit_inode(ino, 0);
 308         pnfs_put_layout_hdr(lo);
 309 out:
 310         nfs_iput_and_deactive(ino);
 311 out_noput:
 312         trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino,
 313                         &args->cbl_stateid, -rv);
 314         return rv;
 315 }
 316
 317 static u32 initiate_bulk_draining(struct nfs_client *clp,
 318                                   struct cb_layoutrecallargs *args)
 319 {
 320         int stat;
 321
 322         if (args->cbl_recall_type == RETURN_FSID)
 323                 stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true);
 324         else
 325                 stat = pnfs_destroy_layouts_byclid(clp, true);
 326         if (stat != 0)
 327                 return NFS4ERR_DELAY;
 328         return NFS4ERR_NOMATCHING_LAYOUT;
 329 }
 330
 331 static u32 do_callback_layoutrecall(struct nfs_client *clp,
 332                                     struct cb_layoutrecallargs *args)
 333 {
 334         if (args->cbl_recall_type == RETURN_FILE)
 335                 return initiate_file_draining(clp, args);
 336         return initiate_bulk_draining(clp, args);
 337 }
 338
 339 __be32 nfs4_callback_layoutrecall(void *argp, void *resp,
 340                                   struct cb_process_state *cps)
 341 {
 342         struct cb_layoutrecallargs *args = argp;
 343         u32 res = NFS4ERR_OP_NOT_IN_SESSION;
 344
 345         if (cps->clp)
 346                 res = do_callback_layoutrecall(cps->clp, args);
 347         return cpu_to_be32(res);
 348 }
 349
 350 static void pnfs_recall_all_layouts(struct nfs_client *clp)
 351 {
 352         struct cb_layoutrecallargs args;
 353
 354         /* Pretend we got a CB_LAYOUTRECALL(ALL) */
 355         memset(&args, 0, sizeof(args));
 356         args.cbl_recall_type = RETURN_ALL;
 357         /* FIXME we ignore errors, what should we do? */
 358         do_callback_layoutrecall(clp, &args);
 359 }
 360
 361 __be32 nfs4_callback_devicenotify(void *argp, void *resp,
 362                                   struct cb_process_state *cps)
 363 {
 364         struct cb_devicenotifyargs *args = argp;
 365         int i;
 366         __be32 res = 0;
 367         struct nfs_client *clp = cps->clp;
 368         struct nfs_server *server = NULL;
 369
 370         if (!clp) {
 371                 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
 372                 goto out;
 373         }
 374
 375         for (i = 0; i < args->ndevs; i++) {
 376                 struct cb_devicenotifyitem *dev = &args->devs[i];
 377
 378                 if (!server ||
 379                     server->pnfs_curr_ld->id != dev->cbd_layout_type) {
 380                         rcu_read_lock();
 381                         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
 382                                 if (server->pnfs_curr_ld &&
 383                                     server->pnfs_curr_ld->id == dev->cbd_layout_type) {
 384                                         rcu_read_unlock();
 385                                         goto found;
 386                                 }
 387                         rcu_read_unlock();
 388                         continue;
 389                 }
 390
 391         found:
 392                 nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id);
 393         }
 394
 395 out:
 396         kfree(args->devs);
 397         return res;
 398 }
 399
 400 /*
 401  * Validate the sequenceID sent by the server.
 402  * Return success if the sequenceID is one more than what we last saw on
 403  * this slot, accounting for wraparound.  Increments the slot's sequence.
 404  *
 405  * We don't yet implement a duplicate request cache, instead we set the
 406  * back channel ca_maxresponsesize_cached to zero. This is OK for now
 407  * since we only currently implement idempotent callbacks anyway.
 408  *
 409  * We have a single slot backchannel at this time, so we don't bother
 410  * checking the used_slots bit array on the table.  The lower layer guarantees
 411  * a single outstanding callback request at a time.
 412  */
 413 static __be32
 414 validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot,
 415                 const struct cb_sequenceargs * args)
 416 {
 417         if (args->csa_slotid > tbl->server_highest_slotid)
 418                 return htonl(NFS4ERR_BADSLOT);
 419
 420         /* Replay */
 421         if (args->csa_sequenceid == slot->seq_nr) {
 422                 if (nfs4_test_locked_slot(tbl, slot->slot_nr))
 423                         return htonl(NFS4ERR_DELAY);
 424                 /* Signal process_op to set this error on next op */
 425                 if (args->csa_cachethis == 0)
 426                         return htonl(NFS4ERR_RETRY_UNCACHED_REP);
 427
 428                 /* Liar! We never allowed you to set csa_cachethis != 0 */
 429                 return htonl(NFS4ERR_SEQ_FALSE_RETRY);
 430         }
 431
 432         /* Note: wraparound relies on seq_nr being of type u32 */
 433         if (likely(args->csa_sequenceid == slot->seq_nr + 1))
 434                 return htonl(NFS4_OK);
 435
 436         /* Misordered request */
 437         return htonl(NFS4ERR_SEQ_MISORDERED);
 438 }
 439
 440 /*
 441  * For each referring call triple, check the session's slot table for
 442  * a match.  If the slot is in use and the sequence numbers match, the
 443  * client is still waiting for a response to the original request.
 444  */
 445 static int referring_call_exists(struct nfs_client *clp,
 446                                   uint32_t nrclists,
 447                                   struct referring_call_list *rclists,
 448                                   spinlock_t *lock)
 449         __releases(lock)
 450         __acquires(lock)
 451 {
 452         int status = 0;
 453         int i, j;
 454         struct nfs4_session *session;
 455         struct nfs4_slot_table *tbl;
 456         struct referring_call_list *rclist;
 457         struct referring_call *ref;
 458
 459         /*
 460          * XXX When client trunking is implemented, this becomes
 461          * a session lookup from within the loop
 462          */
 463         session = clp->cl_session;
 464         tbl = &session->fc_slot_table;
 465
 466         for (i = 0; i < nrclists; i++) {
 467                 rclist = &rclists[i];
 468                 if (memcmp(session->sess_id.data,
 469                            rclist->rcl_sessionid.data,
 470                            NFS4_MAX_SESSIONID_LEN) != 0)
 471                         continue;
 472
 473                 for (j = 0; j < rclist->rcl_nrefcalls; j++) {
 474                         ref = &rclist->rcl_refcalls[j];
 475                         spin_unlock(lock);
 476                         status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid,
 477                                         ref->rc_sequenceid, HZ >> 1) < 0;
 478                         spin_lock(lock);
 479                         if (status)
 480                                 goto out;
 481                 }
 482         }
 483
 484 out:
 485         return status;
 486 }
 487
 488 __be32 nfs4_callback_sequence(void *argp, void *resp,
 489                               struct cb_process_state *cps)
 490 {
 491         struct cb_sequenceargs *args = argp;
 492         struct cb_sequenceres *res = resp;
 493         struct nfs4_slot_table *tbl;
 494         struct nfs4_slot *slot;
 495         struct nfs_client *clp;
 496         int i;
 497         __be32 status = htonl(NFS4ERR_BADSESSION);
 498
 499         clp = nfs4_find_client_sessionid(cps->net, args->csa_addr,
 500                                          &args->csa_sessionid, cps->minorversion);
 501         if (clp == NULL)
 502                 goto out;
 503
 504         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
 505                 goto out;
 506
 507         tbl = &clp->cl_session->bc_slot_table;
 508
 509         /* Set up res before grabbing the spinlock */
 510         memcpy(&res->csr_sessionid, &args->csa_sessionid,
 511                sizeof(res->csr_sessionid));
 512         res->csr_sequenceid = args->csa_sequenceid;
 513         res->csr_slotid = args->csa_slotid;
 514
 515         spin_lock(&tbl->slot_tbl_lock);
 516         /* state manager is resetting the session */
 517         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
 518                 status = htonl(NFS4ERR_DELAY);
 519                 /* Return NFS4ERR_BADSESSION if we're draining the session
 520                  * in order to reset it.
 521                  */
 522                 if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
 523                         status = htonl(NFS4ERR_BADSESSION);
 524                 goto out_unlock;
 525         }
 526
 527         status = htonl(NFS4ERR_BADSLOT);
 528         slot = nfs4_lookup_slot(tbl, args->csa_slotid);
 529         if (IS_ERR(slot))
 530                 goto out_unlock;
 531
 532         res->csr_highestslotid = tbl->server_highest_slotid;
 533         res->csr_target_highestslotid = tbl->target_highest_slotid;
 534
 535         status = validate_seqid(tbl, slot, args);
 536         if (status)
 537                 goto out_unlock;
 538         if (!nfs4_try_to_lock_slot(tbl, slot)) {
 539                 status = htonl(NFS4ERR_DELAY);
 540                 goto out_unlock;
 541         }
 542         cps->slot = slot;
 543
 544         /* The ca_maxresponsesize_cached is 0 with no DRC */
 545         if (args->csa_cachethis != 0) {
 546                 status = htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
 547                 goto out_unlock;
 548         }
 549
 550         /*
 551          * Check for pending referring calls.  If a match is found, a
 552          * related callback was received before the response to the original
 553          * call.
 554          */
 555         if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists,
 556                                 &tbl->slot_tbl_lock) < 0) {
 557                 status = htonl(NFS4ERR_DELAY);
 558                 goto out_unlock;
 559         }
 560
 561         /*
 562          * RFC5661 20.9.3
 563          * If CB_SEQUENCE returns an error, then the state of the slot
 564          * (sequence ID, cached reply) MUST NOT change.
 565          */
 566         slot->seq_nr = args->csa_sequenceid;
 567 out_unlock:
 568         spin_unlock(&tbl->slot_tbl_lock);
 569
 570 out:
 571         cps->clp = clp; /* put in nfs4_callback_compound */
 572         for (i = 0; i < args->csa_nrclists; i++)
 573                 kfree(args->csa_rclists[i].rcl_refcalls);
 574         kfree(args->csa_rclists);
 575
 576         if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
 577                 cps->drc_status = status;
 578                 status = 0;
 579         } else
 580                 res->csr_status = status;
 581
 582         trace_nfs4_cb_sequence(args, res, status);
 583         return status;
 584 }
 585
 586 static bool
 587 validate_bitmap_values(unsigned int mask)
 588 {
 589         return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
 590 }
 591
 592 __be32 nfs4_callback_recallany(void *argp, void *resp,
 593                                struct cb_process_state *cps)
 594 {
 595         struct cb_recallanyargs *args = argp;
 596         __be32 status;
 597         fmode_t flags = 0;
 598
 599         status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
 600         if (!cps->clp) /* set in cb_sequence */
 601                 goto out;
 602
 603         dprintk_rcu("NFS: RECALL_ANY callback request from %s\n",
 604                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
 605
 606         status = cpu_to_be32(NFS4ERR_INVAL);
 607         if (!validate_bitmap_values(args->craa_type_mask))
 608                 goto out;
 609
 610         status = cpu_to_be32(NFS4_OK);
 611         if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_RDATA_DLG))
 612                 flags = FMODE_READ;
 613         if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_WDATA_DLG))
 614                 flags |= FMODE_WRITE;
 615         if (flags)
 616                 nfs_expire_unused_delegation_types(cps->clp, flags);
 617
 618         if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_FILE_LAYOUT))
 619                 pnfs_recall_all_layouts(cps->clp);
 620 out:
 621         dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
 622         return status;
 623 }
 624
 625 /* Reduce the fore channel's max_slots to the target value */
 626 __be32 nfs4_callback_recallslot(void *argp, void *resp,
 627                                 struct cb_process_state *cps)
 628 {
 629         struct cb_recallslotargs *args = argp;
 630         struct nfs4_slot_table *fc_tbl;
 631         __be32 status;
 632
 633         status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
 634         if (!cps->clp) /* set in cb_sequence */
 635                 goto out;
 636
 637         dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n",
 638                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
 639                 args->crsa_target_highest_slotid);
 640
 641         fc_tbl = &cps->clp->cl_session->fc_slot_table;
 642
 643         status = htonl(NFS4_OK);
 644
 645         nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid);
 646         nfs41_notify_server(cps->clp);
 647 out:
 648         dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
 649         return status;
 650 }
 651
 652 __be32 nfs4_callback_notify_lock(void *argp, void *resp,
 653                                  struct cb_process_state *cps)
 654 {
 655         struct cb_notify_lock_args *args = argp;
 656
 657         if (!cps->clp) /* set in cb_sequence */
 658                 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
 659
 660         dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n",
 661                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
 662
 663         /* Don't wake anybody if the string looked bogus */
 664         if (args->cbnl_valid)
 665                 __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args);
 666
 667         return htonl(NFS4_OK);
 668 }
 669 #endif /* CONFIG_NFS_V4_1 */
 670 #ifdef CONFIG_NFS_V4_2
 671 static void nfs4_copy_cb_args(struct nfs4_copy_state *cp_state,
 672                                 struct cb_offloadargs *args)
 673 {
 674         cp_state->count = args->wr_count;
 675         cp_state->error = args->error;
 676         if (!args->error) {
 677                 cp_state->verf.committed = args->wr_writeverf.committed;
 678                 memcpy(&cp_state->verf.verifier.data[0],
 679                         &args->wr_writeverf.verifier.data[0],
 680                         NFS4_VERIFIER_SIZE);
 681         }
 682 }
 683
 684 __be32 nfs4_callback_offload(void *data, void *dummy,
 685                              struct cb_process_state *cps)
 686 {
 687         struct cb_offloadargs *args = data;
 688         struct nfs_server *server;
 689         struct nfs4_copy_state *copy;
 690         bool found = false;
 691
 692         spin_lock(&cps->clp->cl_lock);
 693         rcu_read_lock();
 694         list_for_each_entry_rcu(server, &cps->clp->cl_superblocks,
 695                                 client_link) {
 696                 list_for_each_entry(copy, &server->ss_copies, copies) {
 697                         if (memcmp(args->coa_stateid.other,
 698                                         copy->stateid.other,
 699                                         sizeof(args->coa_stateid.other)))
 700                                 continue;
 701                         nfs4_copy_cb_args(copy, args);
 702                         complete(&copy->completion);
 703                         found = true;
 704                         goto out;
 705                 }
 706         }
 707 out:
 708         rcu_read_unlock();
 709         if (!found) {
 710                 copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_NOFS);
 711                 if (!copy) {
 712                         spin_unlock(&cps->clp->cl_lock);
 713                         return htonl(NFS4ERR_SERVERFAULT);
 714                 }
 715                 memcpy(&copy->stateid, &args->coa_stateid, NFS4_STATEID_SIZE);
 716                 nfs4_copy_cb_args(copy, args);
 717                 list_add_tail(&copy->copies, &cps->clp->pending_cb_stateids);
 718         }
 719         spin_unlock(&cps->clp->cl_lock);
 720
 721         return 0;
 722 }
 723 #endif /* CONFIG_NFS_V4_2 */