fs/nfs/callback_proc.c

   1 /*
   2  * linux/fs/nfs/callback_proc.c
   3  *
   4  * Copyright (C) 2004 Trond Myklebust
   5  *
   6  * NFSv4 callback procedures
   7  */
   8 #include <linux/nfs4.h>
   9 #include <linux/nfs_fs.h>
  10 #include <linux/slab.h>
  11 #include "nfs4_fs.h"
  12 #include "callback.h"
  13 #include "delegation.h"
  14 #include "internal.h"
  15 #include "pnfs.h"
  16
  17 #ifdef NFS_DEBUG
  18 #define NFSDBG_FACILITY NFSDBG_CALLBACK
  19 #endif
  20
  21 __be32 nfs4_callback_getattr(struct cb_getattrargs *args,
  22                              struct cb_getattrres *res,
  23                              struct cb_process_state *cps)
  24 {
  25         struct nfs_delegation *delegation;
  26         struct nfs_inode *nfsi;
  27         struct inode *inode;
  28
  29         res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
  30         if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
  31                 goto out;
  32
  33         res->bitmap[0] = res->bitmap[1] = 0;
  34         res->status = htonl(NFS4ERR_BADHANDLE);
  35
  36         dprintk("NFS: GETATTR callback request from %s\n",
  37                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
  38
  39         inode = nfs_delegation_find_inode(cps->clp, &args->fh);
  40         if (inode == NULL)
  41                 goto out;
  42         nfsi = NFS_I(inode);
  43         rcu_read_lock();
  44         delegation = rcu_dereference(nfsi->delegation);
  45         if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)
  46                 goto out_iput;
  47         res->size = i_size_read(inode);
  48         res->change_attr = delegation->change_attr;
  49         if (nfsi->npages != 0)
  50                 res->change_attr++;
  51         res->ctime = inode->i_ctime;
  52         res->mtime = inode->i_mtime;
  53         res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
  54                 args->bitmap[0];
  55         res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &
  56                 args->bitmap[1];
  57         res->status = 0;
  58 out_iput:
  59         rcu_read_unlock();
  60         iput(inode);
  61 out:
  62         dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
  63         return res->status;
  64 }
  65
  66 __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy,
  67                             struct cb_process_state *cps)
  68 {
  69         struct inode *inode;
  70         __be32 res;
  71
  72         res = htonl(NFS4ERR_OP_NOT_IN_SESSION);
  73         if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
  74                 goto out;
  75
  76         dprintk("NFS: RECALL callback request from %s\n",
  77                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
  78
  79         res = htonl(NFS4ERR_BADHANDLE);
  80         inode = nfs_delegation_find_inode(cps->clp, &args->fh);
  81         if (inode == NULL)
  82                 goto out;
  83         /* Set up a helper thread to actually return the delegation */
  84         switch (nfs_async_inode_return_delegation(inode, &args->stateid)) {
  85         case 0:
  86                 res = 0;
  87                 break;
  88         case -ENOENT:
  89                 if (res != 0)
  90                         res = htonl(NFS4ERR_BAD_STATEID);
  91                 break;
  92         default:
  93                 res = htonl(NFS4ERR_RESOURCE);
  94         }
  95         iput(inode);
  96 out:
  97         dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
  98         return res;
  99 }
 100
 101 int nfs4_validate_delegation_stateid(struct nfs_delegation *delegation, const nfs4_stateid *stateid)
 102 {
 103         if (delegation == NULL || memcmp(delegation->stateid.data, stateid->data,
 104                                          sizeof(delegation->stateid.data)) != 0)
 105                 return 0;
 106         return 1;
 107 }
 108
 109 #if defined(CONFIG_NFS_V4_1)
 110
 111 static u32 initiate_file_draining(struct nfs_client *clp,
 112                                   struct cb_layoutrecallargs *args)
 113 {
 114         struct nfs_server *server;
 115         struct pnfs_layout_hdr *lo;
 116         struct inode *ino;
 117         bool found = false;
 118         u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
 119         LIST_HEAD(free_me_list);
 120
 121         spin_lock(&clp->cl_lock);
 122         rcu_read_lock();
 123         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
 124                 list_for_each_entry(lo, &server->layouts, plh_layouts) {
 125                         if (nfs_compare_fh(&args->cbl_fh,
 126                                            &NFS_I(lo->plh_inode)->fh))
 127                                 continue;
 128                         ino = igrab(lo->plh_inode);
 129                         if (!ino)
 130                                 continue;
 131                         found = true;
 132                         /* Without this, layout can be freed as soon
 133                          * as we release cl_lock.
 134                          */
 135                         get_layout_hdr(lo);
 136                         break;
 137                 }
 138                 if (found)
 139                         break;
 140         }
 141         rcu_read_unlock();
 142         spin_unlock(&clp->cl_lock);
 143
 144         if (!found)
 145                 return NFS4ERR_NOMATCHING_LAYOUT;
 146
 147         spin_lock(&ino->i_lock);
 148         if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) ||
 149             mark_matching_lsegs_invalid(lo, &free_me_list,
 150                                         &args->cbl_range))
 151                 rv = NFS4ERR_DELAY;
 152         else
 153                 rv = NFS4ERR_NOMATCHING_LAYOUT;
 154         pnfs_set_layout_stateid(lo, &args->cbl_stateid, true);
 155         spin_unlock(&ino->i_lock);
 156         pnfs_free_lseg_list(&free_me_list);
 157         put_layout_hdr(lo);
 158         iput(ino);
 159         return rv;
 160 }
 161
 162 static u32 initiate_bulk_draining(struct nfs_client *clp,
 163                                   struct cb_layoutrecallargs *args)
 164 {
 165         struct nfs_server *server;
 166         struct pnfs_layout_hdr *lo;
 167         struct inode *ino;
 168         u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
 169         struct pnfs_layout_hdr *tmp;
 170         LIST_HEAD(recall_list);
 171         LIST_HEAD(free_me_list);
 172         struct pnfs_layout_range range = {
 173                 .iomode = IOMODE_ANY,
 174                 .offset = 0,
 175                 .length = NFS4_MAX_UINT64,
 176         };
 177
 178         spin_lock(&clp->cl_lock);
 179         rcu_read_lock();
 180         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
 181                 if ((args->cbl_recall_type == RETURN_FSID) &&
 182                     memcmp(&server->fsid, &args->cbl_fsid,
 183                            sizeof(struct nfs_fsid)))
 184                         continue;
 185
 186                 list_for_each_entry(lo, &server->layouts, plh_layouts) {
 187                         if (!igrab(lo->plh_inode))
 188                                 continue;
 189                         get_layout_hdr(lo);
 190                         BUG_ON(!list_empty(&lo->plh_bulk_recall));
 191                         list_add(&lo->plh_bulk_recall, &recall_list);
 192                 }
 193         }
 194         rcu_read_unlock();
 195         spin_unlock(&clp->cl_lock);
 196
 197         list_for_each_entry_safe(lo, tmp,
 198                                  &recall_list, plh_bulk_recall) {
 199                 ino = lo->plh_inode;
 200                 spin_lock(&ino->i_lock);
 201                 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
 202                 if (mark_matching_lsegs_invalid(lo, &free_me_list, &range))
 203                         rv = NFS4ERR_DELAY;
 204                 list_del_init(&lo->plh_bulk_recall);
 205                 spin_unlock(&ino->i_lock);
 206                 pnfs_free_lseg_list(&free_me_list);
 207                 put_layout_hdr(lo);
 208                 iput(ino);
 209         }
 210         return rv;
 211 }
 212
 213 static u32 do_callback_layoutrecall(struct nfs_client *clp,
 214                                     struct cb_layoutrecallargs *args)
 215 {
 216         u32 res = NFS4ERR_DELAY;
 217
 218         dprintk("%s enter, type=%i\n", __func__, args->cbl_recall_type);
 219         if (test_and_set_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state))
 220                 goto out;
 221         if (args->cbl_recall_type == RETURN_FILE)
 222                 res = initiate_file_draining(clp, args);
 223         else
 224                 res = initiate_bulk_draining(clp, args);
 225         clear_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state);
 226 out:
 227         dprintk("%s returning %i\n", __func__, res);
 228         return res;
 229
 230 }
 231
 232 __be32 nfs4_callback_layoutrecall(struct cb_layoutrecallargs *args,
 233                                   void *dummy, struct cb_process_state *cps)
 234 {
 235         u32 res;
 236
 237         dprintk("%s: -->\n", __func__);
 238
 239         if (cps->clp)
 240                 res = do_callback_layoutrecall(cps->clp, args);
 241         else
 242                 res = NFS4ERR_OP_NOT_IN_SESSION;
 243
 244         dprintk("%s: exit with status = %d\n", __func__, res);
 245         return cpu_to_be32(res);
 246 }
 247
 248 static void pnfs_recall_all_layouts(struct nfs_client *clp)
 249 {
 250         struct cb_layoutrecallargs args;
 251
 252         /* Pretend we got a CB_LAYOUTRECALL(ALL) */
 253         memset(&args, 0, sizeof(args));
 254         args.cbl_recall_type = RETURN_ALL;
 255         /* FIXME we ignore errors, what should we do? */
 256         do_callback_layoutrecall(clp, &args);
 257 }
 258
 259 __be32 nfs4_callback_devicenotify(struct cb_devicenotifyargs *args,
 260                                   void *dummy, struct cb_process_state *cps)
 261 {
 262         int i;
 263         __be32 res = 0;
 264         struct nfs_client *clp = cps->clp;
 265         struct nfs_server *server = NULL;
 266
 267         dprintk("%s: -->\n", __func__);
 268
 269         if (!clp) {
 270                 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
 271                 goto out;
 272         }
 273
 274         for (i = 0; i < args->ndevs; i++) {
 275                 struct cb_devicenotifyitem *dev = &args->devs[i];
 276
 277                 if (!server ||
 278                     server->pnfs_curr_ld->id != dev->cbd_layout_type) {
 279                         rcu_read_lock();
 280                         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
 281                                 if (server->pnfs_curr_ld &&
 282                                     server->pnfs_curr_ld->id == dev->cbd_layout_type) {
 283                                         rcu_read_unlock();
 284                                         goto found;
 285                                 }
 286                         rcu_read_unlock();
 287                         dprintk("%s: layout type %u not found\n",
 288                                 __func__, dev->cbd_layout_type);
 289                         continue;
 290                 }
 291
 292         found:
 293                 if (dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE)
 294                         dprintk("%s: NOTIFY_DEVICEID4_CHANGE not supported, "
 295                                 "deleting instead\n", __func__);
 296                 nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id);
 297         }
 298
 299 out:
 300         kfree(args->devs);
 301         dprintk("%s: exit with status = %u\n",
 302                 __func__, be32_to_cpu(res));
 303         return res;
 304 }
 305
 306 int nfs41_validate_delegation_stateid(struct nfs_delegation *delegation, const nfs4_stateid *stateid)
 307 {
 308         if (delegation == NULL)
 309                 return 0;
 310
 311         if (stateid->stateid.seqid != 0)
 312                 return 0;
 313         if (memcmp(&delegation->stateid.stateid.other,
 314                    &stateid->stateid.other,
 315                    NFS4_STATEID_OTHER_SIZE))
 316                 return 0;
 317
 318         return 1;
 319 }
 320
 321 /*
 322  * Validate the sequenceID sent by the server.
 323  * Return success if the sequenceID is one more than what we last saw on
 324  * this slot, accounting for wraparound.  Increments the slot's sequence.
 325  *
 326  * We don't yet implement a duplicate request cache, instead we set the
 327  * back channel ca_maxresponsesize_cached to zero. This is OK for now
 328  * since we only currently implement idempotent callbacks anyway.
 329  *
 330  * We have a single slot backchannel at this time, so we don't bother
 331  * checking the used_slots bit array on the table.  The lower layer guarantees
 332  * a single outstanding callback request at a time.
 333  */
 334 static __be32
 335 validate_seqid(struct nfs4_slot_table *tbl, struct cb_sequenceargs * args)
 336 {
 337         struct nfs4_slot *slot;
 338
 339         dprintk("%s enter. slotid %d seqid %d\n",
 340                 __func__, args->csa_slotid, args->csa_sequenceid);
 341
 342         if (args->csa_slotid > NFS41_BC_MAX_CALLBACKS)
 343                 return htonl(NFS4ERR_BADSLOT);
 344
 345         slot = tbl->slots + args->csa_slotid;
 346         dprintk("%s slot table seqid: %d\n", __func__, slot->seq_nr);
 347
 348         /* Normal */
 349         if (likely(args->csa_sequenceid == slot->seq_nr + 1)) {
 350                 slot->seq_nr++;
 351                 return htonl(NFS4_OK);
 352         }
 353
 354         /* Replay */
 355         if (args->csa_sequenceid == slot->seq_nr) {
 356                 dprintk("%s seqid %d is a replay\n",
 357                         __func__, args->csa_sequenceid);
 358                 /* Signal process_op to set this error on next op */
 359                 if (args->csa_cachethis == 0)
 360                         return htonl(NFS4ERR_RETRY_UNCACHED_REP);
 361
 362                 /* The ca_maxresponsesize_cached is 0 with no DRC */
 363                 else if (args->csa_cachethis == 1)
 364                         return htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
 365         }
 366
 367         /* Wraparound */
 368         if (args->csa_sequenceid == 1 && (slot->seq_nr + 1) == 0) {
 369                 slot->seq_nr = 1;
 370                 return htonl(NFS4_OK);
 371         }
 372
 373         /* Misordered request */
 374         return htonl(NFS4ERR_SEQ_MISORDERED);
 375 }
 376
 377 /*
 378  * For each referring call triple, check the session's slot table for
 379  * a match.  If the slot is in use and the sequence numbers match, the
 380  * client is still waiting for a response to the original request.
 381  */
 382 static bool referring_call_exists(struct nfs_client *clp,
 383                                   uint32_t nrclists,
 384                                   struct referring_call_list *rclists)
 385 {
 386         bool status = 0;
 387         int i, j;
 388         struct nfs4_session *session;
 389         struct nfs4_slot_table *tbl;
 390         struct referring_call_list *rclist;
 391         struct referring_call *ref;
 392
 393         /*
 394          * XXX When client trunking is implemented, this becomes
 395          * a session lookup from within the loop
 396          */
 397         session = clp->cl_session;
 398         tbl = &session->fc_slot_table;
 399
 400         for (i = 0; i < nrclists; i++) {
 401                 rclist = &rclists[i];
 402                 if (memcmp(session->sess_id.data,
 403                            rclist->rcl_sessionid.data,
 404                            NFS4_MAX_SESSIONID_LEN) != 0)
 405                         continue;
 406
 407                 for (j = 0; j < rclist->rcl_nrefcalls; j++) {
 408                         ref = &rclist->rcl_refcalls[j];
 409
 410                         dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u "
 411                                 "slotid %u\n", __func__,
 412                                 ((u32 *)&rclist->rcl_sessionid.data)[0],
 413                                 ((u32 *)&rclist->rcl_sessionid.data)[1],
 414                                 ((u32 *)&rclist->rcl_sessionid.data)[2],
 415                                 ((u32 *)&rclist->rcl_sessionid.data)[3],
 416                                 ref->rc_sequenceid, ref->rc_slotid);
 417
 418                         spin_lock(&tbl->slot_tbl_lock);
 419                         status = (test_bit(ref->rc_slotid, tbl->used_slots) &&
 420                                   tbl->slots[ref->rc_slotid].seq_nr ==
 421                                         ref->rc_sequenceid);
 422                         spin_unlock(&tbl->slot_tbl_lock);
 423                         if (status)
 424                                 goto out;
 425                 }
 426         }
 427
 428 out:
 429         return status;
 430 }
 431
 432 __be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
 433                               struct cb_sequenceres *res,
 434                               struct cb_process_state *cps)
 435 {
 436         struct nfs_client *clp;
 437         int i;
 438         __be32 status = htonl(NFS4ERR_BADSESSION);
 439
 440         cps->clp = NULL;
 441
 442         clp = nfs4_find_client_sessionid(args->csa_addr, &args->csa_sessionid);
 443         if (clp == NULL)
 444                 goto out;
 445
 446         /* state manager is resetting the session */
 447         if (test_bit(NFS4_SESSION_DRAINING, &clp->cl_session->session_state)) {
 448                 status = NFS4ERR_DELAY;
 449                 goto out;
 450         }
 451
 452         status = validate_seqid(&clp->cl_session->bc_slot_table, args);
 453         if (status)
 454                 goto out;
 455
 456         /*
 457          * Check for pending referring calls.  If a match is found, a
 458          * related callback was received before the response to the original
 459          * call.
 460          */
 461         if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) {
 462                 status = htonl(NFS4ERR_DELAY);
 463                 goto out;
 464         }
 465
 466         memcpy(&res->csr_sessionid, &args->csa_sessionid,
 467                sizeof(res->csr_sessionid));
 468         res->csr_sequenceid = args->csa_sequenceid;
 469         res->csr_slotid = args->csa_slotid;
 470         res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
 471         res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
 472         nfs4_cb_take_slot(clp);
 473
 474 out:
 475         cps->clp = clp; /* put in nfs4_callback_compound */
 476         for (i = 0; i < args->csa_nrclists; i++)
 477                 kfree(args->csa_rclists[i].rcl_refcalls);
 478         kfree(args->csa_rclists);
 479
 480         if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
 481                 cps->drc_status = status;
 482                 status = 0;
 483         } else
 484                 res->csr_status = status;
 485
 486         dprintk("%s: exit with status = %d res->csr_status %d\n", __func__,
 487                 ntohl(status), ntohl(res->csr_status));
 488         return status;
 489 }
 490
 491 static bool
 492 validate_bitmap_values(unsigned long mask)
 493 {
 494         return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
 495 }
 496
 497 __be32 nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy,
 498                                struct cb_process_state *cps)
 499 {
 500         __be32 status;
 501         fmode_t flags = 0;
 502
 503         status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
 504         if (!cps->clp) /* set in cb_sequence */
 505                 goto out;
 506
 507         dprintk("NFS: RECALL_ANY callback request from %s\n",
 508                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
 509
 510         status = cpu_to_be32(NFS4ERR_INVAL);
 511         if (!validate_bitmap_values(args->craa_type_mask))
 512                 goto out;
 513
 514         status = cpu_to_be32(NFS4_OK);
 515         if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *)
 516                      &args->craa_type_mask))
 517                 flags = FMODE_READ;
 518         if (test_bit(RCA4_TYPE_MASK_WDATA_DLG, (const unsigned long *)
 519                      &args->craa_type_mask))
 520                 flags |= FMODE_WRITE;
 521         if (test_bit(RCA4_TYPE_MASK_FILE_LAYOUT, (const unsigned long *)
 522                      &args->craa_type_mask))
 523                 pnfs_recall_all_layouts(cps->clp);
 524         if (flags)
 525                 nfs_expire_all_delegation_types(cps->clp, flags);
 526 out:
 527         dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
 528         return status;
 529 }
 530
 531 /* Reduce the fore channel's max_slots to the target value */
 532 __be32 nfs4_callback_recallslot(struct cb_recallslotargs *args, void *dummy,
 533                                 struct cb_process_state *cps)
 534 {
 535         struct nfs4_slot_table *fc_tbl;
 536         __be32 status;
 537
 538         status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
 539         if (!cps->clp) /* set in cb_sequence */
 540                 goto out;
 541
 542         dprintk("NFS: CB_RECALL_SLOT request from %s target max slots %d\n",
 543                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
 544                 args->crsa_target_max_slots);
 545
 546         fc_tbl = &cps->clp->cl_session->fc_slot_table;
 547
 548         status = htonl(NFS4ERR_BAD_HIGH_SLOT);
 549         if (args->crsa_target_max_slots > fc_tbl->max_slots ||
 550             args->crsa_target_max_slots < 1)
 551                 goto out;
 552
 553         status = htonl(NFS4_OK);
 554         if (args->crsa_target_max_slots == fc_tbl->max_slots)
 555                 goto out;
 556
 557         fc_tbl->target_max_slots = args->crsa_target_max_slots;
 558         nfs41_handle_recall_slot(cps->clp);
 559 out:
 560         dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
 561         return status;
 562 }
 563 #endif /* CONFIG_NFS_V4_1 */