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 inode *inode;
  30
  31         res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
  32         if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
  33                 goto out;
  34
  35         res->bitmap[0] = res->bitmap[1] = 0;
  36         res->status = htonl(NFS4ERR_BADHANDLE);
  37
  38         dprintk_rcu("NFS: GETATTR callback request from %s\n",
  39                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
  40
  41         inode = nfs_delegation_find_inode(cps->clp, &args->fh);
  42         if (IS_ERR(inode)) {
  43                 if (inode == ERR_PTR(-EAGAIN))
  44                         res->status = htonl(NFS4ERR_DELAY);
  45                 trace_nfs4_cb_getattr(cps->clp, &args->fh, NULL,
  46                                 -ntohl(res->status));
  47                 goto out;
  48         }
  49         rcu_read_lock();
  50         delegation = nfs4_get_valid_delegation(inode);
  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         nfs_iput_and_deactive(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 (IS_ERR(inode)) {
  90                 if (inode == ERR_PTR(-EAGAIN))
  91                         res = htonl(NFS4ERR_DELAY);
  92                 trace_nfs4_cb_recall(cps->clp, &args->fh, NULL,
  93                                 &args->stateid, -ntohl(res));
  94                 goto out;
  95         }
  96         /* Set up a helper thread to actually return the delegation */
  97         switch (nfs_async_inode_return_delegation(inode, &args->stateid)) {
  98         case 0:
  99                 res = 0;
 100                 break;
 101         case -ENOENT:
 102                 res = htonl(NFS4ERR_BAD_STATEID);
 103                 break;
 104         default:
 105                 res = htonl(NFS4ERR_RESOURCE);
 106         }
 107         trace_nfs4_cb_recall(cps->clp, &args->fh, inode,
 108                         &args->stateid, -ntohl(res));
 109         nfs_iput_and_deactive(inode);
 110 out:
 111         dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
 112         return res;
 113 }
 114
 115 #if defined(CONFIG_NFS_V4_1)
 116
 117 /*
 118  * Lookup a layout inode by stateid
 119  *
 120  * Note: returns a refcount on the inode and superblock
 121  */
 122 static struct inode *nfs_layout_find_inode_by_stateid(struct nfs_client *clp,
 123                 const nfs4_stateid *stateid)
 124 {
 125         struct nfs_server *server;
 126         struct inode *inode;
 127         struct pnfs_layout_hdr *lo;
 128
 129         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
 130                 list_for_each_entry(lo, &server->layouts, plh_layouts) {
 131                         if (stateid != NULL &&
 132                             !nfs4_stateid_match_other(stateid, &lo->plh_stateid))
 133                                 continue;
 134                         inode = igrab(lo->plh_inode);
 135                         if (!inode)
 136                                 return ERR_PTR(-EAGAIN);
 137                         if (!nfs_sb_active(inode->i_sb)) {
 138                                 rcu_read_unlock();
 139                                 spin_unlock(&clp->cl_lock);
 140                                 iput(inode);
 141                                 spin_lock(&clp->cl_lock);
 142                                 rcu_read_lock();
 143                                 return ERR_PTR(-EAGAIN);
 144                         }
 145                         return inode;
 146                 }
 147         }
 148
 149         return ERR_PTR(-ENOENT);
 150 }
 151
 152 /*
 153  * Lookup a layout inode by filehandle.
 154  *
 155  * Note: returns a refcount on the inode and superblock
 156  *
 157  */
 158 static struct inode *nfs_layout_find_inode_by_fh(struct nfs_client *clp,
 159                 const struct nfs_fh *fh)
 160 {
 161         struct nfs_server *server;
 162         struct nfs_inode *nfsi;
 163         struct inode *inode;
 164         struct pnfs_layout_hdr *lo;
 165
 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                                 return ERR_PTR(-EAGAIN);
 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                                 return ERR_PTR(-EAGAIN);
 183                         }
 184                         return inode;
 185                 }
 186         }
 187
 188         return ERR_PTR(-ENOENT);
 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 == ERR_PTR(-ENOENT))
 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 not initialised? */
 217         if (!pnfs_layout_is_valid(lo))
 218                 return NFS4ERR_NOMATCHING_LAYOUT;
 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 (IS_ERR(ino)) {
 256                 if (ino == ERR_PTR(-EAGAIN))
 257                         rv = NFS4ERR_DELAY;
 258                 goto out_noput;
 259         }
 260
 261         pnfs_layoutcommit_inode(ino, false);
 262
 263
 264         spin_lock(&ino->i_lock);
 265         lo = NFS_I(ino)->layout;
 266         if (!lo) {
 267                 spin_unlock(&ino->i_lock);
 268                 goto out;
 269         }
 270         pnfs_get_layout_hdr(lo);
 271         rv = pnfs_check_callback_stateid(lo, &args->cbl_stateid);
 272         if (rv != NFS_OK)
 273                 goto unlock;
 274
 275         /*
 276          * Enforce RFC5661 Section 12.5.5.2.1.5 (Bulk Recall and Return)
 277          */
 278         if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
 279                 rv = NFS4ERR_DELAY;
 280                 goto unlock;
 281         }
 282
 283         pnfs_set_layout_stateid(lo, &args->cbl_stateid, true);
 284         switch (pnfs_mark_matching_lsegs_return(lo, &free_me_list,
 285                                 &args->cbl_range,
 286                                 be32_to_cpu(args->cbl_stateid.seqid))) {
 287         case 0:
 288         case -EBUSY:
 289                 /* There are layout segments that need to be returned */
 290                 rv = NFS4_OK;
 291                 break;
 292         case -ENOENT:
 293                 /* Embrace your forgetfulness! */
 294                 rv = NFS4ERR_NOMATCHING_LAYOUT;
 295
 296                 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
 297                         NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo,
 298                                 &args->cbl_range);
 299                 }
 300         }
 301 unlock:
 302         spin_unlock(&ino->i_lock);
 303         pnfs_free_lseg_list(&free_me_list);
 304         /* Free all lsegs that are attached to commit buckets */
 305         nfs_commit_inode(ino, 0);
 306         pnfs_put_layout_hdr(lo);
 307 out:
 308         nfs_iput_and_deactive(ino);
 309 out_noput:
 310         trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino,
 311                         &args->cbl_stateid, -rv);
 312         return rv;
 313 }
 314
 315 static u32 initiate_bulk_draining(struct nfs_client *clp,
 316                                   struct cb_layoutrecallargs *args)
 317 {
 318         int stat;
 319
 320         if (args->cbl_recall_type == RETURN_FSID)
 321                 stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true);
 322         else
 323                 stat = pnfs_destroy_layouts_byclid(clp, true);
 324         if (stat != 0)
 325                 return NFS4ERR_DELAY;
 326         return NFS4ERR_NOMATCHING_LAYOUT;
 327 }
 328
 329 static u32 do_callback_layoutrecall(struct nfs_client *clp,
 330                                     struct cb_layoutrecallargs *args)
 331 {
 332         if (args->cbl_recall_type == RETURN_FILE)
 333                 return initiate_file_draining(clp, args);
 334         return initiate_bulk_draining(clp, args);
 335 }
 336
 337 __be32 nfs4_callback_layoutrecall(void *argp, void *resp,
 338                                   struct cb_process_state *cps)
 339 {
 340         struct cb_layoutrecallargs *args = argp;
 341         u32 res = NFS4ERR_OP_NOT_IN_SESSION;
 342
 343         if (cps->clp)
 344                 res = do_callback_layoutrecall(cps->clp, args);
 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(void *argp, void *resp,
 360                                   struct cb_process_state *cps)
 361 {
 362         struct cb_devicenotifyargs *args = argp;
 363         int i;
 364         __be32 res = 0;
 365         struct nfs_client *clp = cps->clp;
 366         struct nfs_server *server = NULL;
 367
 368         if (!clp) {
 369                 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
 370                 goto out;
 371         }
 372
 373         for (i = 0; i < args->ndevs; i++) {
 374                 struct cb_devicenotifyitem *dev = &args->devs[i];
 375
 376                 if (!server ||
 377                     server->pnfs_curr_ld->id != dev->cbd_layout_type) {
 378                         rcu_read_lock();
 379                         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
 380                                 if (server->pnfs_curr_ld &&
 381                                     server->pnfs_curr_ld->id == dev->cbd_layout_type) {
 382                                         rcu_read_unlock();
 383                                         goto found;
 384                                 }
 385                         rcu_read_unlock();
 386                         continue;
 387                 }
 388
 389         found:
 390                 nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id);
 391         }
 392
 393 out:
 394         kfree(args->devs);
 395         return res;
 396 }
 397
 398 /*
 399  * Validate the sequenceID sent by the server.
 400  * Return success if the sequenceID is one more than what we last saw on
 401  * this slot, accounting for wraparound.  Increments the slot's sequence.
 402  *
 403  * We don't yet implement a duplicate request cache, instead we set the
 404  * back channel ca_maxresponsesize_cached to zero. This is OK for now
 405  * since we only currently implement idempotent callbacks anyway.
 406  *
 407  * We have a single slot backchannel at this time, so we don't bother
 408  * checking the used_slots bit array on the table.  The lower layer guarantees
 409  * a single outstanding callback request at a time.
 410  */
 411 static __be32
 412 validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot,
 413                 const struct cb_sequenceargs * args)
 414 {
 415         __be32 ret;
 416
 417         ret = cpu_to_be32(NFS4ERR_BADSLOT);
 418         if (args->csa_slotid > tbl->server_highest_slotid)
 419                 goto out_err;
 420
 421         /* Replay */
 422         if (args->csa_sequenceid == slot->seq_nr) {
 423                 ret = cpu_to_be32(NFS4ERR_DELAY);
 424                 if (nfs4_test_locked_slot(tbl, slot->slot_nr))
 425                         goto out_err;
 426
 427                 /* Signal process_op to set this error on next op */
 428                 ret = cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP);
 429                 if (args->csa_cachethis == 0)
 430                         goto out_err;
 431
 432                 /* Liar! We never allowed you to set csa_cachethis != 0 */
 433                 ret = cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY);
 434                 goto out_err;
 435         }
 436
 437         /* Note: wraparound relies on seq_nr being of type u32 */
 438         /* Misordered request */
 439         ret = cpu_to_be32(NFS4ERR_SEQ_MISORDERED);
 440         if (args->csa_sequenceid != slot->seq_nr + 1)
 441                 goto out_err;
 442
 443         return cpu_to_be32(NFS4_OK);
 444
 445 out_err:
 446         trace_nfs4_cb_seqid_err(args, ret);
 447         return ret;
 448 }
 449
 450 /*
 451  * For each referring call triple, check the session's slot table for
 452  * a match.  If the slot is in use and the sequence numbers match, the
 453  * client is still waiting for a response to the original request.
 454  */
 455 static int referring_call_exists(struct nfs_client *clp,
 456                                   uint32_t nrclists,
 457                                   struct referring_call_list *rclists,
 458                                   spinlock_t *lock)
 459         __releases(lock)
 460         __acquires(lock)
 461 {
 462         int status = 0;
 463         int i, j;
 464         struct nfs4_session *session;
 465         struct nfs4_slot_table *tbl;
 466         struct referring_call_list *rclist;
 467         struct referring_call *ref;
 468
 469         /*
 470          * XXX When client trunking is implemented, this becomes
 471          * a session lookup from within the loop
 472          */
 473         session = clp->cl_session;
 474         tbl = &session->fc_slot_table;
 475
 476         for (i = 0; i < nrclists; i++) {
 477                 rclist = &rclists[i];
 478                 if (memcmp(session->sess_id.data,
 479                            rclist->rcl_sessionid.data,
 480                            NFS4_MAX_SESSIONID_LEN) != 0)
 481                         continue;
 482
 483                 for (j = 0; j < rclist->rcl_nrefcalls; j++) {
 484                         ref = &rclist->rcl_refcalls[j];
 485                         spin_unlock(lock);
 486                         status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid,
 487                                         ref->rc_sequenceid, HZ >> 1) < 0;
 488                         spin_lock(lock);
 489                         if (status)
 490                                 goto out;
 491                 }
 492         }
 493
 494 out:
 495         return status;
 496 }
 497
 498 __be32 nfs4_callback_sequence(void *argp, void *resp,
 499                               struct cb_process_state *cps)
 500 {
 501         struct cb_sequenceargs *args = argp;
 502         struct cb_sequenceres *res = resp;
 503         struct nfs4_slot_table *tbl;
 504         struct nfs4_slot *slot;
 505         struct nfs_client *clp;
 506         int i;
 507         __be32 status = htonl(NFS4ERR_BADSESSION);
 508
 509         clp = nfs4_find_client_sessionid(cps->net, args->csa_addr,
 510                                          &args->csa_sessionid, cps->minorversion);
 511         if (clp == NULL)
 512                 goto out;
 513
 514         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
 515                 goto out;
 516
 517         tbl = &clp->cl_session->bc_slot_table;
 518
 519         /* Set up res before grabbing the spinlock */
 520         memcpy(&res->csr_sessionid, &args->csa_sessionid,
 521                sizeof(res->csr_sessionid));
 522         res->csr_sequenceid = args->csa_sequenceid;
 523         res->csr_slotid = args->csa_slotid;
 524
 525         spin_lock(&tbl->slot_tbl_lock);
 526         /* state manager is resetting the session */
 527         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
 528                 status = htonl(NFS4ERR_DELAY);
 529                 /* Return NFS4ERR_BADSESSION if we're draining the session
 530                  * in order to reset it.
 531                  */
 532                 if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
 533                         status = htonl(NFS4ERR_BADSESSION);
 534                 goto out_unlock;
 535         }
 536
 537         status = htonl(NFS4ERR_BADSLOT);
 538         slot = nfs4_lookup_slot(tbl, args->csa_slotid);
 539         if (IS_ERR(slot))
 540                 goto out_unlock;
 541
 542         res->csr_highestslotid = tbl->server_highest_slotid;
 543         res->csr_target_highestslotid = tbl->target_highest_slotid;
 544
 545         status = validate_seqid(tbl, slot, args);
 546         if (status)
 547                 goto out_unlock;
 548         if (!nfs4_try_to_lock_slot(tbl, slot)) {
 549                 status = htonl(NFS4ERR_DELAY);
 550                 goto out_unlock;
 551         }
 552         cps->slot = slot;
 553
 554         /* The ca_maxresponsesize_cached is 0 with no DRC */
 555         if (args->csa_cachethis != 0) {
 556                 status = htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
 557                 goto out_unlock;
 558         }
 559
 560         /*
 561          * Check for pending referring calls.  If a match is found, a
 562          * related callback was received before the response to the original
 563          * call.
 564          */
 565         if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists,
 566                                 &tbl->slot_tbl_lock) < 0) {
 567                 status = htonl(NFS4ERR_DELAY);
 568                 goto out_unlock;
 569         }
 570
 571         /*
 572          * RFC5661 20.9.3
 573          * If CB_SEQUENCE returns an error, then the state of the slot
 574          * (sequence ID, cached reply) MUST NOT change.
 575          */
 576         slot->seq_nr = args->csa_sequenceid;
 577 out_unlock:
 578         spin_unlock(&tbl->slot_tbl_lock);
 579
 580 out:
 581         cps->clp = clp; /* put in nfs4_callback_compound */
 582         for (i = 0; i < args->csa_nrclists; i++)
 583                 kfree(args->csa_rclists[i].rcl_refcalls);
 584         kfree(args->csa_rclists);
 585
 586         if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
 587                 cps->drc_status = status;
 588                 status = 0;
 589         } else
 590                 res->csr_status = status;
 591
 592         trace_nfs4_cb_sequence(args, res, status);
 593         return status;
 594 }
 595
 596 static bool
 597 validate_bitmap_values(unsigned int mask)
 598 {
 599         return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
 600 }
 601
 602 __be32 nfs4_callback_recallany(void *argp, void *resp,
 603                                struct cb_process_state *cps)
 604 {
 605         struct cb_recallanyargs *args = argp;
 606         __be32 status;
 607         fmode_t flags = 0;
 608
 609         status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
 610         if (!cps->clp) /* set in cb_sequence */
 611                 goto out;
 612
 613         dprintk_rcu("NFS: RECALL_ANY callback request from %s\n",
 614                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
 615
 616         status = cpu_to_be32(NFS4ERR_INVAL);
 617         if (!validate_bitmap_values(args->craa_type_mask))
 618                 goto out;
 619
 620         status = cpu_to_be32(NFS4_OK);
 621         if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_RDATA_DLG))
 622                 flags = FMODE_READ;
 623         if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_WDATA_DLG))
 624                 flags |= FMODE_WRITE;
 625         if (flags)
 626                 nfs_expire_unused_delegation_types(cps->clp, flags);
 627
 628         if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_FILE_LAYOUT))
 629                 pnfs_recall_all_layouts(cps->clp);
 630 out:
 631         dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
 632         return status;
 633 }
 634
 635 /* Reduce the fore channel's max_slots to the target value */
 636 __be32 nfs4_callback_recallslot(void *argp, void *resp,
 637                                 struct cb_process_state *cps)
 638 {
 639         struct cb_recallslotargs *args = argp;
 640         struct nfs4_slot_table *fc_tbl;
 641         __be32 status;
 642
 643         status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
 644         if (!cps->clp) /* set in cb_sequence */
 645                 goto out;
 646
 647         dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n",
 648                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
 649                 args->crsa_target_highest_slotid);
 650
 651         fc_tbl = &cps->clp->cl_session->fc_slot_table;
 652
 653         status = htonl(NFS4_OK);
 654
 655         nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid);
 656         nfs41_notify_server(cps->clp);
 657 out:
 658         dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
 659         return status;
 660 }
 661
 662 __be32 nfs4_callback_notify_lock(void *argp, void *resp,
 663                                  struct cb_process_state *cps)
 664 {
 665         struct cb_notify_lock_args *args = argp;
 666
 667         if (!cps->clp) /* set in cb_sequence */
 668                 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
 669
 670         dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n",
 671                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
 672
 673         /* Don't wake anybody if the string looked bogus */
 674         if (args->cbnl_valid)
 675                 __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args);
 676
 677         return htonl(NFS4_OK);
 678 }
 679 #endif /* CONFIG_NFS_V4_1 */
 680 #ifdef CONFIG_NFS_V4_2
 681 static void nfs4_copy_cb_args(struct nfs4_copy_state *cp_state,
 682                                 struct cb_offloadargs *args)
 683 {
 684         cp_state->count = args->wr_count;
 685         cp_state->error = args->error;
 686         if (!args->error) {
 687                 cp_state->verf.committed = args->wr_writeverf.committed;
 688                 memcpy(&cp_state->verf.verifier.data[0],
 689                         &args->wr_writeverf.verifier.data[0],
 690                         NFS4_VERIFIER_SIZE);
 691         }
 692 }
 693
 694 __be32 nfs4_callback_offload(void *data, void *dummy,
 695                              struct cb_process_state *cps)
 696 {
 697         struct cb_offloadargs *args = data;
 698         struct nfs_server *server;
 699         struct nfs4_copy_state *copy, *tmp_copy;
 700         bool found = false;
 701
 702         copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_NOFS);
 703         if (!copy)
 704                 return htonl(NFS4ERR_SERVERFAULT);
 705
 706         spin_lock(&cps->clp->cl_lock);
 707         rcu_read_lock();
 708         list_for_each_entry_rcu(server, &cps->clp->cl_superblocks,
 709                                 client_link) {
 710                 list_for_each_entry(tmp_copy, &server->ss_copies, copies) {
 711                         if (memcmp(args->coa_stateid.other,
 712                                         tmp_copy->stateid.other,
 713                                         sizeof(args->coa_stateid.other)))
 714                                 continue;
 715                         nfs4_copy_cb_args(tmp_copy, args);
 716                         complete(&tmp_copy->completion);
 717                         found = true;
 718                         goto out;
 719                 }
 720         }
 721 out:
 722         rcu_read_unlock();
 723         if (!found) {
 724                 memcpy(&copy->stateid, &args->coa_stateid, NFS4_STATEID_SIZE);
 725                 nfs4_copy_cb_args(copy, args);
 726                 list_add_tail(&copy->copies, &cps->clp->pending_cb_stateids);
 727         } else
 728                 kfree(copy);
 729         spin_unlock(&cps->clp->cl_lock);
 730
 731         return 0;
 732 }
 733 #endif /* CONFIG_NFS_V4_2 */