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         __must_hold(RCU)
 125 {
 126         struct nfs_server *server;
 127         struct inode *inode;
 128         struct pnfs_layout_hdr *lo;
 129
 130         rcu_read_lock();
 131         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
 132                 list_for_each_entry_rcu(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                         if (!nfs_sb_active(server->super))
 139                                 continue;
 140                         inode = igrab(lo->plh_inode);
 141                         rcu_read_unlock();
 142                         if (inode)
 143                                 return inode;
 144                         nfs_sb_deactive(server->super);
 145                         return ERR_PTR(-EAGAIN);
 146                 }
 147         }
 148         rcu_read_unlock();
 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         rcu_read_lock();
 167         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
 168                 list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) {
 169                         nfsi = NFS_I(lo->plh_inode);
 170                         if (nfs_compare_fh(fh, &nfsi->fh))
 171                                 continue;
 172                         if (nfsi->layout != lo)
 173                                 continue;
 174                         if (!nfs_sb_active(server->super))
 175                                 continue;
 176                         inode = igrab(lo->plh_inode);
 177                         rcu_read_unlock();
 178                         if (inode)
 179                                 return inode;
 180                         nfs_sb_deactive(server->super);
 181                         return ERR_PTR(-EAGAIN);
 182                 }
 183         }
 184         rcu_read_unlock();
 185         return ERR_PTR(-ENOENT);
 186 }
 187
 188 static struct inode *nfs_layout_find_inode(struct nfs_client *clp,
 189                 const struct nfs_fh *fh,
 190                 const nfs4_stateid *stateid)
 191 {
 192         struct inode *inode;
 193
 194         inode = nfs_layout_find_inode_by_stateid(clp, stateid);
 195         if (inode == ERR_PTR(-ENOENT))
 196                 inode = nfs_layout_find_inode_by_fh(clp, fh);
 197         return inode;
 198 }
 199
 200 /*
 201  * Enforce RFC5661 section 12.5.5.2.1. (Layout Recall and Return Sequencing)
 202  */
 203 static u32 pnfs_check_callback_stateid(struct pnfs_layout_hdr *lo,
 204                                         const nfs4_stateid *new)
 205 {
 206         u32 oldseq, newseq;
 207
 208         /* Is the stateid not initialised? */
 209         if (!pnfs_layout_is_valid(lo))
 210                 return NFS4ERR_NOMATCHING_LAYOUT;
 211
 212         /* Mismatched stateid? */
 213         if (!nfs4_stateid_match_other(&lo->plh_stateid, new))
 214                 return NFS4ERR_BAD_STATEID;
 215
 216         newseq = be32_to_cpu(new->seqid);
 217         /* Are we already in a layout recall situation? */
 218         if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
 219             lo->plh_return_seq != 0) {
 220                 if (newseq < lo->plh_return_seq)
 221                         return NFS4ERR_OLD_STATEID;
 222                 if (newseq > lo->plh_return_seq)
 223                         return NFS4ERR_DELAY;
 224                 goto out;
 225         }
 226
 227         /* Check that the stateid matches what we think it should be. */
 228         oldseq = be32_to_cpu(lo->plh_stateid.seqid);
 229         if (newseq > oldseq + 1)
 230                 return NFS4ERR_DELAY;
 231         /* Crazy server! */
 232         if (newseq <= oldseq)
 233                 return NFS4ERR_OLD_STATEID;
 234 out:
 235         return NFS_OK;
 236 }
 237
 238 static u32 initiate_file_draining(struct nfs_client *clp,
 239                                   struct cb_layoutrecallargs *args)
 240 {
 241         struct inode *ino;
 242         struct pnfs_layout_hdr *lo;
 243         u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
 244         LIST_HEAD(free_me_list);
 245
 246         ino = nfs_layout_find_inode(clp, &args->cbl_fh, &args->cbl_stateid);
 247         if (IS_ERR(ino)) {
 248                 if (ino == ERR_PTR(-EAGAIN))
 249                         rv = NFS4ERR_DELAY;
 250                 goto out_noput;
 251         }
 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
 267         /*
 268          * Enforce RFC5661 Section 12.5.5.2.1.5 (Bulk Recall and Return)
 269          */
 270         if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
 271                 rv = NFS4ERR_DELAY;
 272                 goto unlock;
 273         }
 274
 275         pnfs_set_layout_stateid(lo, &args->cbl_stateid, NULL, true);
 276         switch (pnfs_mark_matching_lsegs_return(lo, &free_me_list,
 277                                 &args->cbl_range,
 278                                 be32_to_cpu(args->cbl_stateid.seqid))) {
 279         case 0:
 280         case -EBUSY:
 281                 /* There are layout segments that need to be returned */
 282                 rv = NFS4_OK;
 283                 break;
 284         case -ENOENT:
 285                 /* Embrace your forgetfulness! */
 286                 rv = NFS4ERR_NOMATCHING_LAYOUT;
 287
 288                 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
 289                         NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo,
 290                                 &args->cbl_range);
 291                 }
 292         }
 293 unlock:
 294         spin_unlock(&ino->i_lock);
 295         pnfs_free_lseg_list(&free_me_list);
 296         /* Free all lsegs that are attached to commit buckets */
 297         nfs_commit_inode(ino, 0);
 298         pnfs_put_layout_hdr(lo);
 299 out:
 300         nfs_iput_and_deactive(ino);
 301 out_noput:
 302         trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino,
 303                         &args->cbl_stateid, -rv);
 304         return rv;
 305 }
 306
 307 static u32 initiate_bulk_draining(struct nfs_client *clp,
 308                                   struct cb_layoutrecallargs *args)
 309 {
 310         int stat;
 311
 312         if (args->cbl_recall_type == RETURN_FSID)
 313                 stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true);
 314         else
 315                 stat = pnfs_destroy_layouts_byclid(clp, true);
 316         if (stat != 0)
 317                 return NFS4ERR_DELAY;
 318         return NFS4ERR_NOMATCHING_LAYOUT;
 319 }
 320
 321 static u32 do_callback_layoutrecall(struct nfs_client *clp,
 322                                     struct cb_layoutrecallargs *args)
 323 {
 324         if (args->cbl_recall_type == RETURN_FILE)
 325                 return initiate_file_draining(clp, args);
 326         return initiate_bulk_draining(clp, args);
 327 }
 328
 329 __be32 nfs4_callback_layoutrecall(void *argp, void *resp,
 330                                   struct cb_process_state *cps)
 331 {
 332         struct cb_layoutrecallargs *args = argp;
 333         u32 res = NFS4ERR_OP_NOT_IN_SESSION;
 334
 335         if (cps->clp)
 336                 res = do_callback_layoutrecall(cps->clp, args);
 337         return cpu_to_be32(res);
 338 }
 339
 340 static void pnfs_recall_all_layouts(struct nfs_client *clp)
 341 {
 342         struct cb_layoutrecallargs args;
 343
 344         /* Pretend we got a CB_LAYOUTRECALL(ALL) */
 345         memset(&args, 0, sizeof(args));
 346         args.cbl_recall_type = RETURN_ALL;
 347         /* FIXME we ignore errors, what should we do? */
 348         do_callback_layoutrecall(clp, &args);
 349 }
 350
 351 __be32 nfs4_callback_devicenotify(void *argp, void *resp,
 352                                   struct cb_process_state *cps)
 353 {
 354         struct cb_devicenotifyargs *args = argp;
 355         int i;
 356         __be32 res = 0;
 357         struct nfs_client *clp = cps->clp;
 358         struct nfs_server *server = NULL;
 359
 360         if (!clp) {
 361                 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
 362                 goto out;
 363         }
 364
 365         for (i = 0; i < args->ndevs; i++) {
 366                 struct cb_devicenotifyitem *dev = &args->devs[i];
 367
 368                 if (!server ||
 369                     server->pnfs_curr_ld->id != dev->cbd_layout_type) {
 370                         rcu_read_lock();
 371                         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
 372                                 if (server->pnfs_curr_ld &&
 373                                     server->pnfs_curr_ld->id == dev->cbd_layout_type) {
 374                                         rcu_read_unlock();
 375                                         goto found;
 376                                 }
 377                         rcu_read_unlock();
 378                         continue;
 379                 }
 380
 381         found:
 382                 nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id);
 383         }
 384
 385 out:
 386         kfree(args->devs);
 387         return res;
 388 }
 389
 390 /*
 391  * Validate the sequenceID sent by the server.
 392  * Return success if the sequenceID is one more than what we last saw on
 393  * this slot, accounting for wraparound.  Increments the slot's sequence.
 394  *
 395  * We don't yet implement a duplicate request cache, instead we set the
 396  * back channel ca_maxresponsesize_cached to zero. This is OK for now
 397  * since we only currently implement idempotent callbacks anyway.
 398  *
 399  * We have a single slot backchannel at this time, so we don't bother
 400  * checking the used_slots bit array on the table.  The lower layer guarantees
 401  * a single outstanding callback request at a time.
 402  */
 403 static __be32
 404 validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot,
 405                 const struct cb_sequenceargs * args)
 406 {
 407         __be32 ret;
 408
 409         ret = cpu_to_be32(NFS4ERR_BADSLOT);
 410         if (args->csa_slotid > tbl->server_highest_slotid)
 411                 goto out_err;
 412
 413         /* Replay */
 414         if (args->csa_sequenceid == slot->seq_nr) {
 415                 ret = cpu_to_be32(NFS4ERR_DELAY);
 416                 if (nfs4_test_locked_slot(tbl, slot->slot_nr))
 417                         goto out_err;
 418
 419                 /* Signal process_op to set this error on next op */
 420                 ret = cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP);
 421                 if (args->csa_cachethis == 0)
 422                         goto out_err;
 423
 424                 /* Liar! We never allowed you to set csa_cachethis != 0 */
 425                 ret = cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY);
 426                 goto out_err;
 427         }
 428
 429         /* Note: wraparound relies on seq_nr being of type u32 */
 430         /* Misordered request */
 431         ret = cpu_to_be32(NFS4ERR_SEQ_MISORDERED);
 432         if (args->csa_sequenceid != slot->seq_nr + 1)
 433                 goto out_err;
 434
 435         return cpu_to_be32(NFS4_OK);
 436
 437 out_err:
 438         trace_nfs4_cb_seqid_err(args, ret);
 439         return ret;
 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         bool schedule_manager = false;
 601
 602         status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
 603         if (!cps->clp) /* set in cb_sequence */
 604                 goto out;
 605
 606         dprintk_rcu("NFS: RECALL_ANY callback request from %s\n",
 607                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
 608
 609         status = cpu_to_be32(NFS4ERR_INVAL);
 610         if (!validate_bitmap_values(args->craa_type_mask))
 611                 goto out;
 612
 613         status = cpu_to_be32(NFS4_OK);
 614         if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_RDATA_DLG))
 615                 flags = FMODE_READ;
 616         if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_WDATA_DLG))
 617                 flags |= FMODE_WRITE;
 618         if (flags)
 619                 nfs_expire_unused_delegation_types(cps->clp, flags);
 620
 621         if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_FILE_LAYOUT))
 622                 pnfs_recall_all_layouts(cps->clp);
 623
 624         if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_READ)) {
 625                 set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_READ, &cps->clp->cl_state);
 626                 schedule_manager = true;
 627         }
 628         if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_RW)) {
 629                 set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_RW, &cps->clp->cl_state);
 630                 schedule_manager = true;
 631         }
 632         if (schedule_manager)
 633                 nfs4_schedule_state_manager(cps->clp);
 634
 635 out:
 636         dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
 637         return status;
 638 }
 639
 640 /* Reduce the fore channel's max_slots to the target value */
 641 __be32 nfs4_callback_recallslot(void *argp, void *resp,
 642                                 struct cb_process_state *cps)
 643 {
 644         struct cb_recallslotargs *args = argp;
 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(void *argp, void *resp,
 668                                  struct cb_process_state *cps)
 669 {
 670         struct cb_notify_lock_args *args = argp;
 671
 672         if (!cps->clp) /* set in cb_sequence */
 673                 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
 674
 675         dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n",
 676                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
 677
 678         /* Don't wake anybody if the string looked bogus */
 679         if (args->cbnl_valid)
 680                 __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args);
 681
 682         return htonl(NFS4_OK);
 683 }
 684 #endif /* CONFIG_NFS_V4_1 */
 685 #ifdef CONFIG_NFS_V4_2
 686 static void nfs4_copy_cb_args(struct nfs4_copy_state *cp_state,
 687                                 struct cb_offloadargs *args)
 688 {
 689         cp_state->count = args->wr_count;
 690         cp_state->error = args->error;
 691         if (!args->error) {
 692                 cp_state->verf.committed = args->wr_writeverf.committed;
 693                 memcpy(&cp_state->verf.verifier.data[0],
 694                         &args->wr_writeverf.verifier.data[0],
 695                         NFS4_VERIFIER_SIZE);
 696         }
 697 }
 698
 699 __be32 nfs4_callback_offload(void *data, void *dummy,
 700                              struct cb_process_state *cps)
 701 {
 702         struct cb_offloadargs *args = data;
 703         struct nfs_server *server;
 704         struct nfs4_copy_state *copy, *tmp_copy;
 705         bool found = false;
 706
 707         copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_NOFS);
 708         if (!copy)
 709                 return htonl(NFS4ERR_SERVERFAULT);
 710
 711         spin_lock(&cps->clp->cl_lock);
 712         rcu_read_lock();
 713         list_for_each_entry_rcu(server, &cps->clp->cl_superblocks,
 714                                 client_link) {
 715                 list_for_each_entry(tmp_copy, &server->ss_copies, copies) {
 716                         if (memcmp(args->coa_stateid.other,
 717                                         tmp_copy->stateid.other,
 718                                         sizeof(args->coa_stateid.other)))
 719                                 continue;
 720                         nfs4_copy_cb_args(tmp_copy, args);
 721                         complete(&tmp_copy->completion);
 722                         found = true;
 723                         goto out;
 724                 }
 725         }
 726 out:
 727         rcu_read_unlock();
 728         if (!found) {
 729                 memcpy(&copy->stateid, &args->coa_stateid, NFS4_STATEID_SIZE);
 730                 nfs4_copy_cb_args(copy, args);
 731                 list_add_tail(&copy->copies, &cps->clp->pending_cb_stateids);
 732         } else
 733                 kfree(copy);
 734         spin_unlock(&cps->clp->cl_lock);
 735
 736         return 0;
 737 }
 738 #endif /* CONFIG_NFS_V4_2 */