fs/dlm/rcom.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /******************************************************************************
   3 *******************************************************************************
   4 **
   5 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
   6 **  Copyright (C) 2005-2008 Red Hat, Inc.  All rights reserved.
   7 **
   8 **
   9 *******************************************************************************
  10 ******************************************************************************/
  11
  12 #include "dlm_internal.h"
  13 #include "lockspace.h"
  14 #include "member.h"
  15 #include "lowcomms.h"
  16 #include "midcomms.h"
  17 #include "rcom.h"
  18 #include "recover.h"
  19 #include "dir.h"
  20 #include "config.h"
  21 #include "memory.h"
  22 #include "lock.h"
  23 #include "util.h"
  24
  25 static int rcom_response(struct dlm_ls *ls)
  26 {
  27         return test_bit(LSFL_RCOM_READY, &ls->ls_flags);
  28 }
  29
  30 static void _create_rcom(struct dlm_ls *ls, int to_nodeid, int type, int len,
  31                          struct dlm_rcom **rc_ret, char *mb, int mb_len)
  32 {
  33         struct dlm_rcom *rc;
  34
  35         rc = (struct dlm_rcom *) mb;
  36
  37         rc->rc_header.h_version = (DLM_HEADER_MAJOR | DLM_HEADER_MINOR);
  38         rc->rc_header.u.h_lockspace = ls->ls_global_id;
  39         rc->rc_header.h_nodeid = dlm_our_nodeid();
  40         rc->rc_header.h_length = mb_len;
  41         rc->rc_header.h_cmd = DLM_RCOM;
  42
  43         rc->rc_type = type;
  44
  45         spin_lock(&ls->ls_recover_lock);
  46         rc->rc_seq = ls->ls_recover_seq;
  47         spin_unlock(&ls->ls_recover_lock);
  48
  49         *rc_ret = rc;
  50 }
  51
  52 static int create_rcom(struct dlm_ls *ls, int to_nodeid, int type, int len,
  53                        struct dlm_rcom **rc_ret, struct dlm_mhandle **mh_ret)
  54 {
  55         int mb_len = sizeof(struct dlm_rcom) + len;
  56         struct dlm_mhandle *mh;
  57         char *mb;
  58
  59         mh = dlm_midcomms_get_mhandle(to_nodeid, mb_len, GFP_NOFS, &mb);
  60         if (!mh) {
  61                 log_print("%s to %d type %d len %d ENOBUFS",
  62                           __func__, to_nodeid, type, len);
  63                 return -ENOBUFS;
  64         }
  65
  66         _create_rcom(ls, to_nodeid, type, len, rc_ret, mb, mb_len);
  67         *mh_ret = mh;
  68         return 0;
  69 }
  70
  71 static int create_rcom_stateless(struct dlm_ls *ls, int to_nodeid, int type,
  72                                  int len, struct dlm_rcom **rc_ret,
  73                                  struct dlm_msg **msg_ret)
  74 {
  75         int mb_len = sizeof(struct dlm_rcom) + len;
  76         struct dlm_msg *msg;
  77         char *mb;
  78
  79         msg = dlm_lowcomms_new_msg(to_nodeid, mb_len, GFP_NOFS, &mb,
  80                                    NULL, NULL);
  81         if (!msg) {
  82                 log_print("create_rcom to %d type %d len %d ENOBUFS",
  83                           to_nodeid, type, len);
  84                 return -ENOBUFS;
  85         }
  86
  87         _create_rcom(ls, to_nodeid, type, len, rc_ret, mb, mb_len);
  88         *msg_ret = msg;
  89         return 0;
  90 }
  91
  92 static void send_rcom(struct dlm_mhandle *mh, struct dlm_rcom *rc)
  93 {
  94         dlm_rcom_out(rc);
  95         dlm_midcomms_commit_mhandle(mh);
  96 }
  97
  98 static void send_rcom_stateless(struct dlm_msg *msg, struct dlm_rcom *rc)
  99 {
 100         dlm_rcom_out(rc);
 101         dlm_lowcomms_commit_msg(msg);
 102         dlm_lowcomms_put_msg(msg);
 103 }
 104
 105 static void set_rcom_status(struct dlm_ls *ls, struct rcom_status *rs,
 106                             uint32_t flags)
 107 {
 108         rs->rs_flags = cpu_to_le32(flags);
 109 }
 110
 111 /* When replying to a status request, a node also sends back its
 112    configuration values.  The requesting node then checks that the remote
 113    node is configured the same way as itself. */
 114
 115 static void set_rcom_config(struct dlm_ls *ls, struct rcom_config *rf,
 116                             uint32_t num_slots)
 117 {
 118         rf->rf_lvblen = cpu_to_le32(ls->ls_lvblen);
 119         rf->rf_lsflags = cpu_to_le32(ls->ls_exflags);
 120
 121         rf->rf_our_slot = cpu_to_le16(ls->ls_slot);
 122         rf->rf_num_slots = cpu_to_le16(num_slots);
 123         rf->rf_generation =  cpu_to_le32(ls->ls_generation);
 124 }
 125
 126 static int check_rcom_config(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid)
 127 {
 128         struct rcom_config *rf = (struct rcom_config *) rc->rc_buf;
 129
 130         if ((rc->rc_header.h_version & 0xFFFF0000) != DLM_HEADER_MAJOR) {
 131                 log_error(ls, "version mismatch: %x nodeid %d: %x",
 132                           DLM_HEADER_MAJOR | DLM_HEADER_MINOR, nodeid,
 133                           rc->rc_header.h_version);
 134                 return -EPROTO;
 135         }
 136
 137         if (le32_to_cpu(rf->rf_lvblen) != ls->ls_lvblen ||
 138             le32_to_cpu(rf->rf_lsflags) != ls->ls_exflags) {
 139                 log_error(ls, "config mismatch: %d,%x nodeid %d: %d,%x",
 140                           ls->ls_lvblen, ls->ls_exflags, nodeid,
 141                           le32_to_cpu(rf->rf_lvblen),
 142                           le32_to_cpu(rf->rf_lsflags));
 143                 return -EPROTO;
 144         }
 145         return 0;
 146 }
 147
 148 static void allow_sync_reply(struct dlm_ls *ls, uint64_t *new_seq)
 149 {
 150         spin_lock(&ls->ls_rcom_spin);
 151         *new_seq = ++ls->ls_rcom_seq;
 152         set_bit(LSFL_RCOM_WAIT, &ls->ls_flags);
 153         spin_unlock(&ls->ls_rcom_spin);
 154 }
 155
 156 static void disallow_sync_reply(struct dlm_ls *ls)
 157 {
 158         spin_lock(&ls->ls_rcom_spin);
 159         clear_bit(LSFL_RCOM_WAIT, &ls->ls_flags);
 160         clear_bit(LSFL_RCOM_READY, &ls->ls_flags);
 161         spin_unlock(&ls->ls_rcom_spin);
 162 }
 163
 164 /*
 165  * low nodeid gathers one slot value at a time from each node.
 166  * it sets need_slots=0, and saves rf_our_slot returned from each
 167  * rcom_config.
 168  *
 169  * other nodes gather all slot values at once from the low nodeid.
 170  * they set need_slots=1, and ignore the rf_our_slot returned from each
 171  * rcom_config.  they use the rf_num_slots returned from the low
 172  * node's rcom_config.
 173  */
 174
 175 int dlm_rcom_status(struct dlm_ls *ls, int nodeid, uint32_t status_flags)
 176 {
 177         struct dlm_rcom *rc;
 178         struct dlm_msg *msg;
 179         int error = 0;
 180
 181         ls->ls_recover_nodeid = nodeid;
 182
 183         if (nodeid == dlm_our_nodeid()) {
 184                 rc = ls->ls_recover_buf;
 185                 rc->rc_result = dlm_recover_status(ls);
 186                 goto out;
 187         }
 188
 189 retry:
 190         error = create_rcom_stateless(ls, nodeid, DLM_RCOM_STATUS,
 191                                       sizeof(struct rcom_status), &rc, &msg);
 192         if (error)
 193                 goto out;
 194
 195         set_rcom_status(ls, (struct rcom_status *)rc->rc_buf, status_flags);
 196
 197         allow_sync_reply(ls, &rc->rc_id);
 198         memset(ls->ls_recover_buf, 0, DLM_MAX_SOCKET_BUFSIZE);
 199
 200         send_rcom_stateless(msg, rc);
 201
 202         error = dlm_wait_function(ls, &rcom_response);
 203         disallow_sync_reply(ls);
 204         if (error == -ETIMEDOUT)
 205                 goto retry;
 206         if (error)
 207                 goto out;
 208
 209         rc = ls->ls_recover_buf;
 210
 211         if (rc->rc_result == -ESRCH) {
 212                 /* we pretend the remote lockspace exists with 0 status */
 213                 log_debug(ls, "remote node %d not ready", nodeid);
 214                 rc->rc_result = 0;
 215                 error = 0;
 216         } else {
 217                 error = check_rcom_config(ls, rc, nodeid);
 218         }
 219
 220         /* the caller looks at rc_result for the remote recovery status */
 221  out:
 222         return error;
 223 }
 224
 225 static void receive_rcom_status(struct dlm_ls *ls, struct dlm_rcom *rc_in)
 226 {
 227         struct dlm_rcom *rc;
 228         struct rcom_status *rs;
 229         uint32_t status;
 230         int nodeid = rc_in->rc_header.h_nodeid;
 231         int len = sizeof(struct rcom_config);
 232         struct dlm_msg *msg;
 233         int num_slots = 0;
 234         int error;
 235
 236         if (!dlm_slots_version(&rc_in->rc_header)) {
 237                 status = dlm_recover_status(ls);
 238                 goto do_create;
 239         }
 240
 241         rs = (struct rcom_status *)rc_in->rc_buf;
 242
 243         if (!(le32_to_cpu(rs->rs_flags) & DLM_RSF_NEED_SLOTS)) {
 244                 status = dlm_recover_status(ls);
 245                 goto do_create;
 246         }
 247
 248         spin_lock(&ls->ls_recover_lock);
 249         status = ls->ls_recover_status;
 250         num_slots = ls->ls_num_slots;
 251         spin_unlock(&ls->ls_recover_lock);
 252         len += num_slots * sizeof(struct rcom_slot);
 253
 254  do_create:
 255         error = create_rcom_stateless(ls, nodeid, DLM_RCOM_STATUS_REPLY,
 256                                       len, &rc, &msg);
 257         if (error)
 258                 return;
 259
 260         rc->rc_id = rc_in->rc_id;
 261         rc->rc_seq_reply = rc_in->rc_seq;
 262         rc->rc_result = status;
 263
 264         set_rcom_config(ls, (struct rcom_config *)rc->rc_buf, num_slots);
 265
 266         if (!num_slots)
 267                 goto do_send;
 268
 269         spin_lock(&ls->ls_recover_lock);
 270         if (ls->ls_num_slots != num_slots) {
 271                 spin_unlock(&ls->ls_recover_lock);
 272                 log_debug(ls, "receive_rcom_status num_slots %d to %d",
 273                           num_slots, ls->ls_num_slots);
 274                 rc->rc_result = 0;
 275                 set_rcom_config(ls, (struct rcom_config *)rc->rc_buf, 0);
 276                 goto do_send;
 277         }
 278
 279         dlm_slots_copy_out(ls, rc);
 280         spin_unlock(&ls->ls_recover_lock);
 281
 282  do_send:
 283         send_rcom_stateless(msg, rc);
 284 }
 285
 286 static void receive_sync_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in)
 287 {
 288         spin_lock(&ls->ls_rcom_spin);
 289         if (!test_bit(LSFL_RCOM_WAIT, &ls->ls_flags) ||
 290             rc_in->rc_id != ls->ls_rcom_seq) {
 291                 log_debug(ls, "reject reply %d from %d seq %llx expect %llx",
 292                           rc_in->rc_type, rc_in->rc_header.h_nodeid,
 293                           (unsigned long long)rc_in->rc_id,
 294                           (unsigned long long)ls->ls_rcom_seq);
 295                 goto out;
 296         }
 297         memcpy(ls->ls_recover_buf, rc_in, rc_in->rc_header.h_length);
 298         set_bit(LSFL_RCOM_READY, &ls->ls_flags);
 299         clear_bit(LSFL_RCOM_WAIT, &ls->ls_flags);
 300         wake_up(&ls->ls_wait_general);
 301  out:
 302         spin_unlock(&ls->ls_rcom_spin);
 303 }
 304
 305 int dlm_rcom_names(struct dlm_ls *ls, int nodeid, char *last_name, int last_len)
 306 {
 307         struct dlm_rcom *rc;
 308         struct dlm_msg *msg;
 309         int error = 0;
 310
 311         ls->ls_recover_nodeid = nodeid;
 312
 313 retry:
 314         error = create_rcom_stateless(ls, nodeid, DLM_RCOM_NAMES, last_len,
 315                                       &rc, &msg);
 316         if (error)
 317                 goto out;
 318         memcpy(rc->rc_buf, last_name, last_len);
 319
 320         allow_sync_reply(ls, &rc->rc_id);
 321         memset(ls->ls_recover_buf, 0, DLM_MAX_SOCKET_BUFSIZE);
 322
 323         send_rcom_stateless(msg, rc);
 324
 325         error = dlm_wait_function(ls, &rcom_response);
 326         disallow_sync_reply(ls);
 327         if (error == -ETIMEDOUT)
 328                 goto retry;
 329  out:
 330         return error;
 331 }
 332
 333 static void receive_rcom_names(struct dlm_ls *ls, struct dlm_rcom *rc_in)
 334 {
 335         struct dlm_rcom *rc;
 336         int error, inlen, outlen, nodeid;
 337         struct dlm_msg *msg;
 338
 339         nodeid = rc_in->rc_header.h_nodeid;
 340         inlen = rc_in->rc_header.h_length - sizeof(struct dlm_rcom);
 341         outlen = DLM_MAX_APP_BUFSIZE - sizeof(struct dlm_rcom);
 342
 343         error = create_rcom_stateless(ls, nodeid, DLM_RCOM_NAMES_REPLY, outlen,
 344                                       &rc, &msg);
 345         if (error)
 346                 return;
 347         rc->rc_id = rc_in->rc_id;
 348         rc->rc_seq_reply = rc_in->rc_seq;
 349
 350         dlm_copy_master_names(ls, rc_in->rc_buf, inlen, rc->rc_buf, outlen,
 351                               nodeid);
 352         send_rcom_stateless(msg, rc);
 353 }
 354
 355 int dlm_send_rcom_lookup(struct dlm_rsb *r, int dir_nodeid)
 356 {
 357         struct dlm_rcom *rc;
 358         struct dlm_mhandle *mh;
 359         struct dlm_ls *ls = r->res_ls;
 360         int error;
 361
 362         error = create_rcom(ls, dir_nodeid, DLM_RCOM_LOOKUP, r->res_length,
 363                             &rc, &mh);
 364         if (error)
 365                 goto out;
 366         memcpy(rc->rc_buf, r->res_name, r->res_length);
 367         rc->rc_id = (unsigned long) r->res_id;
 368
 369         send_rcom(mh, rc);
 370  out:
 371         return error;
 372 }
 373
 374 static void receive_rcom_lookup(struct dlm_ls *ls, struct dlm_rcom *rc_in)
 375 {
 376         struct dlm_rcom *rc;
 377         struct dlm_mhandle *mh;
 378         int error, ret_nodeid, nodeid = rc_in->rc_header.h_nodeid;
 379         int len = rc_in->rc_header.h_length - sizeof(struct dlm_rcom);
 380
 381         /* Old code would send this special id to trigger a debug dump. */
 382         if (rc_in->rc_id == 0xFFFFFFFF) {
 383                 log_error(ls, "receive_rcom_lookup dump from %d", nodeid);
 384                 dlm_dump_rsb_name(ls, rc_in->rc_buf, len);
 385                 return;
 386         }
 387
 388         error = create_rcom(ls, nodeid, DLM_RCOM_LOOKUP_REPLY, 0, &rc, &mh);
 389         if (error)
 390                 return;
 391
 392         error = dlm_master_lookup(ls, nodeid, rc_in->rc_buf, len,
 393                                   DLM_LU_RECOVER_MASTER, &ret_nodeid, NULL);
 394         if (error)
 395                 ret_nodeid = error;
 396         rc->rc_result = ret_nodeid;
 397         rc->rc_id = rc_in->rc_id;
 398         rc->rc_seq_reply = rc_in->rc_seq;
 399
 400         send_rcom(mh, rc);
 401 }
 402
 403 static void receive_rcom_lookup_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in)
 404 {
 405         dlm_recover_master_reply(ls, rc_in);
 406 }
 407
 408 static void pack_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb,
 409                            struct rcom_lock *rl)
 410 {
 411         memset(rl, 0, sizeof(*rl));
 412
 413         rl->rl_ownpid = cpu_to_le32(lkb->lkb_ownpid);
 414         rl->rl_lkid = cpu_to_le32(lkb->lkb_id);
 415         rl->rl_exflags = cpu_to_le32(lkb->lkb_exflags);
 416         rl->rl_flags = cpu_to_le32(lkb->lkb_flags);
 417         rl->rl_lvbseq = cpu_to_le32(lkb->lkb_lvbseq);
 418         rl->rl_rqmode = lkb->lkb_rqmode;
 419         rl->rl_grmode = lkb->lkb_grmode;
 420         rl->rl_status = lkb->lkb_status;
 421         rl->rl_wait_type = cpu_to_le16(lkb->lkb_wait_type);
 422
 423         if (lkb->lkb_bastfn)
 424                 rl->rl_asts |= DLM_CB_BAST;
 425         if (lkb->lkb_astfn)
 426                 rl->rl_asts |= DLM_CB_CAST;
 427
 428         rl->rl_namelen = cpu_to_le16(r->res_length);
 429         memcpy(rl->rl_name, r->res_name, r->res_length);
 430
 431         /* FIXME: might we have an lvb without DLM_LKF_VALBLK set ?
 432            If so, receive_rcom_lock_args() won't take this copy. */
 433
 434         if (lkb->lkb_lvbptr)
 435                 memcpy(rl->rl_lvb, lkb->lkb_lvbptr, r->res_ls->ls_lvblen);
 436 }
 437
 438 int dlm_send_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
 439 {
 440         struct dlm_ls *ls = r->res_ls;
 441         struct dlm_rcom *rc;
 442         struct dlm_mhandle *mh;
 443         struct rcom_lock *rl;
 444         int error, len = sizeof(struct rcom_lock);
 445
 446         if (lkb->lkb_lvbptr)
 447                 len += ls->ls_lvblen;
 448
 449         error = create_rcom(ls, r->res_nodeid, DLM_RCOM_LOCK, len, &rc, &mh);
 450         if (error)
 451                 goto out;
 452
 453         rl = (struct rcom_lock *) rc->rc_buf;
 454         pack_rcom_lock(r, lkb, rl);
 455         rc->rc_id = (unsigned long) r;
 456
 457         send_rcom(mh, rc);
 458  out:
 459         return error;
 460 }
 461
 462 /* needs at least dlm_rcom + rcom_lock */
 463 static void receive_rcom_lock(struct dlm_ls *ls, struct dlm_rcom *rc_in)
 464 {
 465         struct dlm_rcom *rc;
 466         struct dlm_mhandle *mh;
 467         int error, nodeid = rc_in->rc_header.h_nodeid;
 468
 469         dlm_recover_master_copy(ls, rc_in);
 470
 471         error = create_rcom(ls, nodeid, DLM_RCOM_LOCK_REPLY,
 472                             sizeof(struct rcom_lock), &rc, &mh);
 473         if (error)
 474                 return;
 475
 476         /* We send back the same rcom_lock struct we received, but
 477            dlm_recover_master_copy() has filled in rl_remid and rl_result */
 478
 479         memcpy(rc->rc_buf, rc_in->rc_buf, sizeof(struct rcom_lock));
 480         rc->rc_id = rc_in->rc_id;
 481         rc->rc_seq_reply = rc_in->rc_seq;
 482
 483         send_rcom(mh, rc);
 484 }
 485
 486 /* If the lockspace doesn't exist then still send a status message
 487    back; it's possible that it just doesn't have its global_id yet. */
 488
 489 int dlm_send_ls_not_ready(int nodeid, struct dlm_rcom *rc_in)
 490 {
 491         struct dlm_rcom *rc;
 492         struct rcom_config *rf;
 493         struct dlm_mhandle *mh;
 494         char *mb;
 495         int mb_len = sizeof(struct dlm_rcom) + sizeof(struct rcom_config);
 496
 497         mh = dlm_midcomms_get_mhandle(nodeid, mb_len, GFP_NOFS, &mb);
 498         if (!mh)
 499                 return -ENOBUFS;
 500
 501         rc = (struct dlm_rcom *) mb;
 502
 503         rc->rc_header.h_version = (DLM_HEADER_MAJOR | DLM_HEADER_MINOR);
 504         rc->rc_header.u.h_lockspace = rc_in->rc_header.u.h_lockspace;
 505         rc->rc_header.h_nodeid = dlm_our_nodeid();
 506         rc->rc_header.h_length = mb_len;
 507         rc->rc_header.h_cmd = DLM_RCOM;
 508
 509         rc->rc_type = DLM_RCOM_STATUS_REPLY;
 510         rc->rc_id = rc_in->rc_id;
 511         rc->rc_seq_reply = rc_in->rc_seq;
 512         rc->rc_result = -ESRCH;
 513
 514         rf = (struct rcom_config *) rc->rc_buf;
 515         rf->rf_lvblen = cpu_to_le32(~0U);
 516
 517         dlm_rcom_out(rc);
 518         dlm_midcomms_commit_mhandle(mh);
 519
 520         return 0;
 521 }
 522
 523 /*
 524  * Ignore messages for stage Y before we set
 525  * recover_status bit for stage X:
 526  *
 527  * recover_status = 0
 528  *
 529  * dlm_recover_members()
 530  * - send nothing
 531  * - recv nothing
 532  * - ignore NAMES, NAMES_REPLY
 533  * - ignore LOOKUP, LOOKUP_REPLY
 534  * - ignore LOCK, LOCK_REPLY
 535  *
 536  * recover_status |= NODES
 537  *
 538  * dlm_recover_members_wait()
 539  *
 540  * dlm_recover_directory()
 541  * - send NAMES
 542  * - recv NAMES_REPLY
 543  * - ignore LOOKUP, LOOKUP_REPLY
 544  * - ignore LOCK, LOCK_REPLY
 545  *
 546  * recover_status |= DIR
 547  *
 548  * dlm_recover_directory_wait()
 549  *
 550  * dlm_recover_masters()
 551  * - send LOOKUP
 552  * - recv LOOKUP_REPLY
 553  *
 554  * dlm_recover_locks()
 555  * - send LOCKS
 556  * - recv LOCKS_REPLY
 557  *
 558  * recover_status |= LOCKS
 559  *
 560  * dlm_recover_locks_wait()
 561  *
 562  * recover_status |= DONE
 563  */
 564
 565 /* Called by dlm_recv; corresponds to dlm_receive_message() but special
 566    recovery-only comms are sent through here. */
 567
 568 void dlm_receive_rcom(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid)
 569 {
 570         int lock_size = sizeof(struct dlm_rcom) + sizeof(struct rcom_lock);
 571         int stop, reply = 0, names = 0, lookup = 0, lock = 0;
 572         uint32_t status;
 573         uint64_t seq;
 574
 575         switch (rc->rc_type) {
 576         case DLM_RCOM_STATUS_REPLY:
 577                 reply = 1;
 578                 break;
 579         case DLM_RCOM_NAMES:
 580                 names = 1;
 581                 break;
 582         case DLM_RCOM_NAMES_REPLY:
 583                 names = 1;
 584                 reply = 1;
 585                 break;
 586         case DLM_RCOM_LOOKUP:
 587                 lookup = 1;
 588                 break;
 589         case DLM_RCOM_LOOKUP_REPLY:
 590                 lookup = 1;
 591                 reply = 1;
 592                 break;
 593         case DLM_RCOM_LOCK:
 594                 lock = 1;
 595                 break;
 596         case DLM_RCOM_LOCK_REPLY:
 597                 lock = 1;
 598                 reply = 1;
 599                 break;
 600         }
 601
 602         spin_lock(&ls->ls_recover_lock);
 603         status = ls->ls_recover_status;
 604         stop = dlm_recovery_stopped(ls);
 605         seq = ls->ls_recover_seq;
 606         spin_unlock(&ls->ls_recover_lock);
 607
 608         if (stop && (rc->rc_type != DLM_RCOM_STATUS))
 609                 goto ignore;
 610
 611         if (reply && (rc->rc_seq_reply != seq))
 612                 goto ignore;
 613
 614         if (!(status & DLM_RS_NODES) && (names || lookup || lock))
 615                 goto ignore;
 616
 617         if (!(status & DLM_RS_DIR) && (lookup || lock))
 618                 goto ignore;
 619
 620         switch (rc->rc_type) {
 621         case DLM_RCOM_STATUS:
 622                 receive_rcom_status(ls, rc);
 623                 break;
 624
 625         case DLM_RCOM_NAMES:
 626                 receive_rcom_names(ls, rc);
 627                 break;
 628
 629         case DLM_RCOM_LOOKUP:
 630                 receive_rcom_lookup(ls, rc);
 631                 break;
 632
 633         case DLM_RCOM_LOCK:
 634                 if (rc->rc_header.h_length < lock_size)
 635                         goto Eshort;
 636                 receive_rcom_lock(ls, rc);
 637                 break;
 638
 639         case DLM_RCOM_STATUS_REPLY:
 640                 receive_sync_reply(ls, rc);
 641                 break;
 642
 643         case DLM_RCOM_NAMES_REPLY:
 644                 receive_sync_reply(ls, rc);
 645                 break;
 646
 647         case DLM_RCOM_LOOKUP_REPLY:
 648                 receive_rcom_lookup_reply(ls, rc);
 649                 break;
 650
 651         case DLM_RCOM_LOCK_REPLY:
 652                 if (rc->rc_header.h_length < lock_size)
 653                         goto Eshort;
 654                 dlm_recover_process_copy(ls, rc);
 655                 break;
 656
 657         default:
 658                 log_error(ls, "receive_rcom bad type %d", rc->rc_type);
 659         }
 660         return;
 661
 662 ignore:
 663         log_limit(ls, "dlm_receive_rcom ignore msg %d "
 664                   "from %d %llu %llu recover seq %llu sts %x gen %u",
 665                    rc->rc_type,
 666                    nodeid,
 667                    (unsigned long long)rc->rc_seq,
 668                    (unsigned long long)rc->rc_seq_reply,
 669                    (unsigned long long)seq,
 670                    status, ls->ls_generation);
 671         return;
 672 Eshort:
 673         log_error(ls, "recovery message %d from %d is too short",
 674                   rc->rc_type, nodeid);
 675 }
 676