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 (!pnfs_layout_is_valid(lo))
 134                                 continue;
 135                         if (stateid != NULL &&
 136                             !nfs4_stateid_match_other(stateid, &lo->plh_stateid))
 137                                 continue;
 138                         inode = igrab(lo->plh_inode);
 139                         if (!inode)
 140                                 return ERR_PTR(-EAGAIN);
 141                         if (!nfs_sb_active(inode->i_sb)) {
 142                                 rcu_read_unlock();
 143                                 spin_unlock(&clp->cl_lock);
 144                                 iput(inode);
 145                                 spin_lock(&clp->cl_lock);
 146                                 rcu_read_lock();
 147                                 return ERR_PTR(-EAGAIN);
 148                         }
 149                         return inode;
 150                 }
 151         }
 152
 153         return ERR_PTR(-ENOENT);
 154 }
 155
 156 /*
 157  * Lookup a layout inode by filehandle.
 158  *
 159  * Note: returns a refcount on the inode and superblock
 160  *
 161  */
 162 static struct inode *nfs_layout_find_inode_by_fh(struct nfs_client *clp,
 163                 const struct nfs_fh *fh)
 164 {
 165         struct nfs_server *server;
 166         struct nfs_inode *nfsi;
 167         struct inode *inode;
 168         struct pnfs_layout_hdr *lo;
 169
 170         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
 171                 list_for_each_entry(lo, &server->layouts, plh_layouts) {
 172                         nfsi = NFS_I(lo->plh_inode);
 173                         if (nfs_compare_fh(fh, &nfsi->fh))
 174                                 continue;
 175                         if (nfsi->layout != lo)
 176                                 continue;
 177                         inode = igrab(lo->plh_inode);
 178                         if (!inode)
 179                                 return ERR_PTR(-EAGAIN);
 180                         if (!nfs_sb_active(inode->i_sb)) {
 181                                 rcu_read_unlock();
 182                                 spin_unlock(&clp->cl_lock);
 183                                 iput(inode);
 184                                 spin_lock(&clp->cl_lock);
 185                                 rcu_read_lock();
 186                                 return ERR_PTR(-EAGAIN);
 187                         }
 188                         return inode;
 189                 }
 190         }
 191
 192         return ERR_PTR(-ENOENT);
 193 }
 194
 195 static struct inode *nfs_layout_find_inode(struct nfs_client *clp,
 196                 const struct nfs_fh *fh,
 197                 const nfs4_stateid *stateid)
 198 {
 199         struct inode *inode;
 200
 201         spin_lock(&clp->cl_lock);
 202         rcu_read_lock();
 203         inode = nfs_layout_find_inode_by_stateid(clp, stateid);
 204         if (inode == ERR_PTR(-ENOENT))
 205                 inode = nfs_layout_find_inode_by_fh(clp, fh);
 206         rcu_read_unlock();
 207         spin_unlock(&clp->cl_lock);
 208
 209         return inode;
 210 }
 211
 212 /*
 213  * Enforce RFC5661 section 12.5.5.2.1. (Layout Recall and Return Sequencing)
 214  */
 215 static u32 pnfs_check_callback_stateid(struct pnfs_layout_hdr *lo,
 216                                         const nfs4_stateid *new)
 217 {
 218         u32 oldseq, newseq;
 219
 220         /* Is the stateid not initialised? */
 221         if (!pnfs_layout_is_valid(lo))
 222                 return NFS4ERR_NOMATCHING_LAYOUT;
 223
 224         /* Mismatched stateid? */
 225         if (!nfs4_stateid_match_other(&lo->plh_stateid, new))
 226                 return NFS4ERR_BAD_STATEID;
 227
 228         newseq = be32_to_cpu(new->seqid);
 229         /* Are we already in a layout recall situation? */
 230         if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
 231             lo->plh_return_seq != 0) {
 232                 if (newseq < lo->plh_return_seq)
 233                         return NFS4ERR_OLD_STATEID;
 234                 if (newseq > lo->plh_return_seq)
 235                         return NFS4ERR_DELAY;
 236                 goto out;
 237         }
 238
 239         /* Check that the stateid matches what we think it should be. */
 240         oldseq = be32_to_cpu(lo->plh_stateid.seqid);
 241         if (newseq > oldseq + 1)
 242                 return NFS4ERR_DELAY;
 243         /* Crazy server! */
 244         if (newseq <= oldseq)
 245                 return NFS4ERR_OLD_STATEID;
 246 out:
 247         return NFS_OK;
 248 }
 249
 250 static u32 initiate_file_draining(struct nfs_client *clp,
 251                                   struct cb_layoutrecallargs *args)
 252 {
 253         struct inode *ino;
 254         struct pnfs_layout_hdr *lo;
 255         u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
 256         LIST_HEAD(free_me_list);
 257
 258         ino = nfs_layout_find_inode(clp, &args->cbl_fh, &args->cbl_stateid);
 259         if (IS_ERR(ino)) {
 260                 if (ino == ERR_PTR(-EAGAIN))
 261                         rv = NFS4ERR_DELAY;
 262                 goto out_noput;
 263         }
 264
 265         pnfs_layoutcommit_inode(ino, false);
 266
 267
 268         spin_lock(&ino->i_lock);
 269         lo = NFS_I(ino)->layout;
 270         if (!lo) {
 271                 spin_unlock(&ino->i_lock);
 272                 goto out;
 273         }
 274         pnfs_get_layout_hdr(lo);
 275         rv = pnfs_check_callback_stateid(lo, &args->cbl_stateid);
 276         if (rv != NFS_OK)
 277                 goto unlock;
 278
 279         /*
 280          * Enforce RFC5661 Section 12.5.5.2.1.5 (Bulk Recall and Return)
 281          */
 282         if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
 283                 rv = NFS4ERR_DELAY;
 284                 goto unlock;
 285         }
 286
 287         pnfs_set_layout_stateid(lo, &args->cbl_stateid, true);
 288         switch (pnfs_mark_matching_lsegs_return(lo, &free_me_list,
 289                                 &args->cbl_range,
 290                                 be32_to_cpu(args->cbl_stateid.seqid))) {
 291         case 0:
 292         case -EBUSY:
 293                 /* There are layout segments that need to be returned */
 294                 rv = NFS4_OK;
 295                 break;
 296         case -ENOENT:
 297                 /* Embrace your forgetfulness! */
 298                 rv = NFS4ERR_NOMATCHING_LAYOUT;
 299
 300                 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
 301                         NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo,
 302                                 &args->cbl_range);
 303                 }
 304         }
 305 unlock:
 306         spin_unlock(&ino->i_lock);
 307         pnfs_free_lseg_list(&free_me_list);
 308         /* Free all lsegs that are attached to commit buckets */
 309         nfs_commit_inode(ino, 0);
 310         pnfs_put_layout_hdr(lo);
 311 out:
 312         nfs_iput_and_deactive(ino);
 313 out_noput:
 314         trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino,
 315                         &args->cbl_stateid, -rv);
 316         return rv;
 317 }
 318
 319 static u32 initiate_bulk_draining(struct nfs_client *clp,
 320                                   struct cb_layoutrecallargs *args)
 321 {
 322         int stat;
 323
 324         if (args->cbl_recall_type == RETURN_FSID)
 325                 stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true);
 326         else
 327                 stat = pnfs_destroy_layouts_byclid(clp, true);
 328         if (stat != 0)
 329                 return NFS4ERR_DELAY;
 330         return NFS4ERR_NOMATCHING_LAYOUT;
 331 }
 332
 333 static u32 do_callback_layoutrecall(struct nfs_client *clp,
 334                                     struct cb_layoutrecallargs *args)
 335 {
 336         if (args->cbl_recall_type == RETURN_FILE)
 337                 return initiate_file_draining(clp, args);
 338         return initiate_bulk_draining(clp, args);
 339 }
 340
 341 __be32 nfs4_callback_layoutrecall(void *argp, void *resp,
 342                                   struct cb_process_state *cps)
 343 {
 344         struct cb_layoutrecallargs *args = argp;
 345         u32 res = NFS4ERR_OP_NOT_IN_SESSION;
 346
 347         if (cps->clp)
 348                 res = do_callback_layoutrecall(cps->clp, args);
 349         return cpu_to_be32(res);
 350 }
 351
 352 static void pnfs_recall_all_layouts(struct nfs_client *clp)
 353 {
 354         struct cb_layoutrecallargs args;
 355
 356         /* Pretend we got a CB_LAYOUTRECALL(ALL) */
 357         memset(&args, 0, sizeof(args));
 358         args.cbl_recall_type = RETURN_ALL;
 359         /* FIXME we ignore errors, what should we do? */
 360         do_callback_layoutrecall(clp, &args);
 361 }
 362
 363 __be32 nfs4_callback_devicenotify(void *argp, void *resp,
 364                                   struct cb_process_state *cps)
 365 {
 366         struct cb_devicenotifyargs *args = argp;
 367         int i;
 368         __be32 res = 0;
 369         struct nfs_client *clp = cps->clp;
 370         struct nfs_server *server = NULL;
 371
 372         if (!clp) {
 373                 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
 374                 goto out;
 375         }
 376
 377         for (i = 0; i < args->ndevs; i++) {
 378                 struct cb_devicenotifyitem *dev = &args->devs[i];
 379
 380                 if (!server ||
 381                     server->pnfs_curr_ld->id != dev->cbd_layout_type) {
 382                         rcu_read_lock();
 383                         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
 384                                 if (server->pnfs_curr_ld &&
 385                                     server->pnfs_curr_ld->id == dev->cbd_layout_type) {
 386                                         rcu_read_unlock();
 387                                         goto found;
 388                                 }
 389                         rcu_read_unlock();
 390                         continue;
 391                 }
 392
 393         found:
 394                 nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id);
 395         }
 396
 397 out:
 398         kfree(args->devs);
 399         return res;
 400 }
 401
 402 /*
 403  * Validate the sequenceID sent by the server.
 404  * Return success if the sequenceID is one more than what we last saw on
 405  * this slot, accounting for wraparound.  Increments the slot's sequence.
 406  *
 407  * We don't yet implement a duplicate request cache, instead we set the
 408  * back channel ca_maxresponsesize_cached to zero. This is OK for now
 409  * since we only currently implement idempotent callbacks anyway.
 410  *
 411  * We have a single slot backchannel at this time, so we don't bother
 412  * checking the used_slots bit array on the table.  The lower layer guarantees
 413  * a single outstanding callback request at a time.
 414  */
 415 static __be32
 416 validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot,
 417                 const struct cb_sequenceargs * args)
 418 {
 419         if (args->csa_slotid > tbl->server_highest_slotid)
 420                 return htonl(NFS4ERR_BADSLOT);
 421
 422         /* Replay */
 423         if (args->csa_sequenceid == slot->seq_nr) {
 424                 if (nfs4_test_locked_slot(tbl, slot->slot_nr))
 425                         return htonl(NFS4ERR_DELAY);
 426                 /* Signal process_op to set this error on next op */
 427                 if (args->csa_cachethis == 0)
 428                         return htonl(NFS4ERR_RETRY_UNCACHED_REP);
 429
 430                 /* Liar! We never allowed you to set csa_cachethis != 0 */
 431                 return htonl(NFS4ERR_SEQ_FALSE_RETRY);
 432         }
 433
 434         /* Note: wraparound relies on seq_nr being of type u32 */
 435         if (likely(args->csa_sequenceid == slot->seq_nr + 1))
 436                 return htonl(NFS4_OK);
 437
 438         /* Misordered request */
 439         return htonl(NFS4ERR_SEQ_MISORDERED);
 440 }
 441
 442 /*
 443  * For each referring call triple, check the session's slot table for
 444  * a match.  If the slot is in use and the sequence numbers match, the
 445  * client is still waiting for a response to the original request.
 446  */
 447 static int referring_call_exists(struct nfs_client *clp,
 448                                   uint32_t nrclists,
 449                                   struct referring_call_list *rclists,
 450                                   spinlock_t *lock)
 451         __releases(lock)
 452         __acquires(lock)
 453 {
 454         int status = 0;
 455         int i, j;
 456         struct nfs4_session *session;
 457         struct nfs4_slot_table *tbl;
 458         struct referring_call_list *rclist;
 459         struct referring_call *ref;
 460
 461         /*
 462          * XXX When client trunking is implemented, this becomes
 463          * a session lookup from within the loop
 464          */
 465         session = clp->cl_session;
 466         tbl = &session->fc_slot_table;
 467
 468         for (i = 0; i < nrclists; i++) {
 469                 rclist = &rclists[i];
 470                 if (memcmp(session->sess_id.data,
 471                            rclist->rcl_sessionid.data,
 472                            NFS4_MAX_SESSIONID_LEN) != 0)
 473                         continue;
 474
 475                 for (j = 0; j < rclist->rcl_nrefcalls; j++) {
 476                         ref = &rclist->rcl_refcalls[j];
 477                         spin_unlock(lock);
 478                         status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid,
 479                                         ref->rc_sequenceid, HZ >> 1) < 0;
 480                         spin_lock(lock);
 481                         if (status)
 482                                 goto out;
 483                 }
 484         }
 485
 486 out:
 487         return status;
 488 }
 489
 490 __be32 nfs4_callback_sequence(void *argp, void *resp,
 491                               struct cb_process_state *cps)
 492 {
 493         struct cb_sequenceargs *args = argp;
 494         struct cb_sequenceres *res = resp;
 495         struct nfs4_slot_table *tbl;
 496         struct nfs4_slot *slot;
 497         struct nfs_client *clp;
 498         int i;
 499         __be32 status = htonl(NFS4ERR_BADSESSION);
 500
 501         clp = nfs4_find_client_sessionid(cps->net, args->csa_addr,
 502                                          &args->csa_sessionid, cps->minorversion);
 503         if (clp == NULL)
 504                 goto out;
 505
 506         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
 507                 goto out;
 508
 509         tbl = &clp->cl_session->bc_slot_table;
 510
 511         /* Set up res before grabbing the spinlock */
 512         memcpy(&res->csr_sessionid, &args->csa_sessionid,
 513                sizeof(res->csr_sessionid));
 514         res->csr_sequenceid = args->csa_sequenceid;
 515         res->csr_slotid = args->csa_slotid;
 516
 517         spin_lock(&tbl->slot_tbl_lock);
 518         /* state manager is resetting the session */
 519         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
 520                 status = htonl(NFS4ERR_DELAY);
 521                 /* Return NFS4ERR_BADSESSION if we're draining the session
 522                  * in order to reset it.
 523                  */
 524                 if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
 525                         status = htonl(NFS4ERR_BADSESSION);
 526                 goto out_unlock;
 527         }
 528
 529         status = htonl(NFS4ERR_BADSLOT);
 530         slot = nfs4_lookup_slot(tbl, args->csa_slotid);
 531         if (IS_ERR(slot))
 532                 goto out_unlock;
 533
 534         res->csr_highestslotid = tbl->server_highest_slotid;
 535         res->csr_target_highestslotid = tbl->target_highest_slotid;
 536
 537         status = validate_seqid(tbl, slot, args);
 538         if (status)
 539                 goto out_unlock;
 540         if (!nfs4_try_to_lock_slot(tbl, slot)) {
 541                 status = htonl(NFS4ERR_DELAY);
 542                 goto out_unlock;
 543         }
 544         cps->slot = slot;
 545
 546         /* The ca_maxresponsesize_cached is 0 with no DRC */
 547         if (args->csa_cachethis != 0) {
 548                 status = htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
 549                 goto out_unlock;
 550         }
 551
 552         /*
 553          * Check for pending referring calls.  If a match is found, a
 554          * related callback was received before the response to the original
 555          * call.
 556          */
 557         if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists,
 558                                 &tbl->slot_tbl_lock) < 0) {
 559                 status = htonl(NFS4ERR_DELAY);
 560                 goto out_unlock;
 561         }
 562
 563         /*
 564          * RFC5661 20.9.3
 565          * If CB_SEQUENCE returns an error, then the state of the slot
 566          * (sequence ID, cached reply) MUST NOT change.
 567          */
 568         slot->seq_nr = args->csa_sequenceid;
 569 out_unlock:
 570         spin_unlock(&tbl->slot_tbl_lock);
 571
 572 out:
 573         cps->clp = clp; /* put in nfs4_callback_compound */
 574         for (i = 0; i < args->csa_nrclists; i++)
 575                 kfree(args->csa_rclists[i].rcl_refcalls);
 576         kfree(args->csa_rclists);
 577
 578         if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
 579                 cps->drc_status = status;
 580                 status = 0;
 581         } else
 582                 res->csr_status = status;
 583
 584         trace_nfs4_cb_sequence(args, res, status);
 585         return status;
 586 }
 587
 588 static bool
 589 validate_bitmap_values(unsigned int mask)
 590 {
 591         return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
 592 }
 593
 594 __be32 nfs4_callback_recallany(void *argp, void *resp,
 595                                struct cb_process_state *cps)
 596 {
 597         struct cb_recallanyargs *args = argp;
 598         __be32 status;
 599         fmode_t flags = 0;
 600
 601         status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
 602         if (!cps->clp) /* set in cb_sequence */
 603                 goto out;
 604
 605         dprintk_rcu("NFS: RECALL_ANY callback request from %s\n",
 606                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
 607
 608         status = cpu_to_be32(NFS4ERR_INVAL);
 609         if (!validate_bitmap_values(args->craa_type_mask))
 610                 goto out;
 611
 612         status = cpu_to_be32(NFS4_OK);
 613         if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_RDATA_DLG))
 614                 flags = FMODE_READ;
 615         if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_WDATA_DLG))
 616                 flags |= FMODE_WRITE;
 617         if (flags)
 618                 nfs_expire_unused_delegation_types(cps->clp, flags);
 619
 620         if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_FILE_LAYOUT))
 621                 pnfs_recall_all_layouts(cps->clp);
 622 out:
 623         dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
 624         return status;
 625 }
 626
 627 /* Reduce the fore channel's max_slots to the target value */
 628 __be32 nfs4_callback_recallslot(void *argp, void *resp,
 629                                 struct cb_process_state *cps)
 630 {
 631         struct cb_recallslotargs *args = argp;
 632         struct nfs4_slot_table *fc_tbl;
 633         __be32 status;
 634
 635         status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
 636         if (!cps->clp) /* set in cb_sequence */
 637                 goto out;
 638
 639         dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n",
 640                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
 641                 args->crsa_target_highest_slotid);
 642
 643         fc_tbl = &cps->clp->cl_session->fc_slot_table;
 644
 645         status = htonl(NFS4_OK);
 646
 647         nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid);
 648         nfs41_notify_server(cps->clp);
 649 out:
 650         dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
 651         return status;
 652 }
 653
 654 __be32 nfs4_callback_notify_lock(void *argp, void *resp,
 655                                  struct cb_process_state *cps)
 656 {
 657         struct cb_notify_lock_args *args = argp;
 658
 659         if (!cps->clp) /* set in cb_sequence */
 660                 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
 661
 662         dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n",
 663                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
 664
 665         /* Don't wake anybody if the string looked bogus */
 666         if (args->cbnl_valid)
 667                 __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args);
 668
 669         return htonl(NFS4_OK);
 670 }
 671 #endif /* CONFIG_NFS_V4_1 */
 672 #ifdef CONFIG_NFS_V4_2
 673 static void nfs4_copy_cb_args(struct nfs4_copy_state *cp_state,
 674                                 struct cb_offloadargs *args)
 675 {
 676         cp_state->count = args->wr_count;
 677         cp_state->error = args->error;
 678         if (!args->error) {
 679                 cp_state->verf.committed = args->wr_writeverf.committed;
 680                 memcpy(&cp_state->verf.verifier.data[0],
 681                         &args->wr_writeverf.verifier.data[0],
 682                         NFS4_VERIFIER_SIZE);
 683         }
 684 }
 685
 686 __be32 nfs4_callback_offload(void *data, void *dummy,
 687                              struct cb_process_state *cps)
 688 {
 689         struct cb_offloadargs *args = data;
 690         struct nfs_server *server;
 691         struct nfs4_copy_state *copy, *tmp_copy;
 692         bool found = false;
 693
 694         copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_NOFS);
 695         if (!copy)
 696                 return htonl(NFS4ERR_SERVERFAULT);
 697
 698         spin_lock(&cps->clp->cl_lock);
 699         rcu_read_lock();
 700         list_for_each_entry_rcu(server, &cps->clp->cl_superblocks,
 701                                 client_link) {
 702                 list_for_each_entry(tmp_copy, &server->ss_copies, copies) {
 703                         if (memcmp(args->coa_stateid.other,
 704                                         tmp_copy->stateid.other,
 705                                         sizeof(args->coa_stateid.other)))
 706                                 continue;
 707                         nfs4_copy_cb_args(tmp_copy, args);
 708                         complete(&tmp_copy->completion);
 709                         found = true;
 710                         goto out;
 711                 }
 712         }
 713 out:
 714         rcu_read_unlock();
 715         if (!found) {
 716                 memcpy(&copy->stateid, &args->coa_stateid, NFS4_STATEID_SIZE);
 717                 nfs4_copy_cb_args(copy, args);
 718                 list_add_tail(&copy->copies, &cps->clp->pending_cb_stateids);
 719         } else
 720                 kfree(copy);
 721         spin_unlock(&cps->clp->cl_lock);
 722
 723         return 0;
 724 }
 725 #endif /* CONFIG_NFS_V4_2 */