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 = cpu_to_le32(DLM_HEADER_MAJOR | DLM_HEADER_MINOR);
  38         rc->rc_header.u.h_lockspace = cpu_to_le32(ls->ls_global_id);
  39         rc->rc_header.h_nodeid = cpu_to_le32(dlm_our_nodeid());
  40         rc->rc_header.h_length = cpu_to_le16(mb_len);
  41         rc->rc_header.h_cmd = DLM_RCOM;
  42
  43         rc->rc_type = cpu_to_le32(type);
  44
  45         spin_lock(&ls->ls_recover_lock);
  46         rc->rc_seq = cpu_to_le64(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_midcomms_commit_mhandle(mh);
  95 }
  96
  97 static void send_rcom_stateless(struct dlm_msg *msg, struct dlm_rcom *rc)
  98 {
  99         dlm_lowcomms_commit_msg(msg);
 100         dlm_lowcomms_put_msg(msg);
 101 }
 102
 103 static void set_rcom_status(struct dlm_ls *ls, struct rcom_status *rs,
 104                             uint32_t flags)
 105 {
 106         rs->rs_flags = cpu_to_le32(flags);
 107 }
 108
 109 /* When replying to a status request, a node also sends back its
 110    configuration values.  The requesting node then checks that the remote
 111    node is configured the same way as itself. */
 112
 113 static void set_rcom_config(struct dlm_ls *ls, struct rcom_config *rf,
 114                             uint32_t num_slots)
 115 {
 116         rf->rf_lvblen = cpu_to_le32(ls->ls_lvblen);
 117         rf->rf_lsflags = cpu_to_le32(ls->ls_exflags);
 118
 119         rf->rf_our_slot = cpu_to_le16(ls->ls_slot);
 120         rf->rf_num_slots = cpu_to_le16(num_slots);
 121         rf->rf_generation =  cpu_to_le32(ls->ls_generation);
 122 }
 123
 124 static int check_rcom_config(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid)
 125 {
 126         struct rcom_config *rf = (struct rcom_config *) rc->rc_buf;
 127
 128         if ((le32_to_cpu(rc->rc_header.h_version) & 0xFFFF0000) != DLM_HEADER_MAJOR) {
 129                 log_error(ls, "version mismatch: %x nodeid %d: %x",
 130                           DLM_HEADER_MAJOR | DLM_HEADER_MINOR, nodeid,
 131                           le32_to_cpu(rc->rc_header.h_version));
 132                 return -EPROTO;
 133         }
 134
 135         if (le32_to_cpu(rf->rf_lvblen) != ls->ls_lvblen ||
 136             le32_to_cpu(rf->rf_lsflags) != ls->ls_exflags) {
 137                 log_error(ls, "config mismatch: %d,%x nodeid %d: %d,%x",
 138                           ls->ls_lvblen, ls->ls_exflags, nodeid,
 139                           le32_to_cpu(rf->rf_lvblen),
 140                           le32_to_cpu(rf->rf_lsflags));
 141                 return -EPROTO;
 142         }
 143         return 0;
 144 }
 145
 146 static void allow_sync_reply(struct dlm_ls *ls, __le64 *new_seq)
 147 {
 148         spin_lock(&ls->ls_rcom_spin);
 149         *new_seq = cpu_to_le64(++ls->ls_rcom_seq);
 150         set_bit(LSFL_RCOM_WAIT, &ls->ls_flags);
 151         spin_unlock(&ls->ls_rcom_spin);
 152 }
 153
 154 static void disallow_sync_reply(struct dlm_ls *ls)
 155 {
 156         spin_lock(&ls->ls_rcom_spin);
 157         clear_bit(LSFL_RCOM_WAIT, &ls->ls_flags);
 158         clear_bit(LSFL_RCOM_READY, &ls->ls_flags);
 159         spin_unlock(&ls->ls_rcom_spin);
 160 }
 161
 162 /*
 163  * low nodeid gathers one slot value at a time from each node.
 164  * it sets need_slots=0, and saves rf_our_slot returned from each
 165  * rcom_config.
 166  *
 167  * other nodes gather all slot values at once from the low nodeid.
 168  * they set need_slots=1, and ignore the rf_our_slot returned from each
 169  * rcom_config.  they use the rf_num_slots returned from the low
 170  * node's rcom_config.
 171  */
 172
 173 int dlm_rcom_status(struct dlm_ls *ls, int nodeid, uint32_t status_flags)
 174 {
 175         struct dlm_rcom *rc;
 176         struct dlm_msg *msg;
 177         int error = 0;
 178
 179         ls->ls_recover_nodeid = nodeid;
 180
 181         if (nodeid == dlm_our_nodeid()) {
 182                 rc = ls->ls_recover_buf;
 183                 rc->rc_result = cpu_to_le32(dlm_recover_status(ls));
 184                 goto out;
 185         }
 186
 187 retry:
 188         error = create_rcom_stateless(ls, nodeid, DLM_RCOM_STATUS,
 189                                       sizeof(struct rcom_status), &rc, &msg);
 190         if (error)
 191                 goto out;
 192
 193         set_rcom_status(ls, (struct rcom_status *)rc->rc_buf, status_flags);
 194
 195         allow_sync_reply(ls, &rc->rc_id);
 196         memset(ls->ls_recover_buf, 0, DLM_MAX_SOCKET_BUFSIZE);
 197
 198         send_rcom_stateless(msg, rc);
 199
 200         error = dlm_wait_function(ls, &rcom_response);
 201         disallow_sync_reply(ls);
 202         if (error == -ETIMEDOUT)
 203                 goto retry;
 204         if (error)
 205                 goto out;
 206
 207         rc = ls->ls_recover_buf;
 208
 209         if (rc->rc_result == cpu_to_le32(-ESRCH)) {
 210                 /* we pretend the remote lockspace exists with 0 status */
 211                 log_debug(ls, "remote node %d not ready", nodeid);
 212                 rc->rc_result = 0;
 213                 error = 0;
 214         } else {
 215                 error = check_rcom_config(ls, rc, nodeid);
 216         }
 217
 218         /* the caller looks at rc_result for the remote recovery status */
 219  out:
 220         return error;
 221 }
 222
 223 static void receive_rcom_status(struct dlm_ls *ls, struct dlm_rcom *rc_in)
 224 {
 225         struct dlm_rcom *rc;
 226         struct rcom_status *rs;
 227         uint32_t status;
 228         int nodeid = le32_to_cpu(rc_in->rc_header.h_nodeid);
 229         int len = sizeof(struct rcom_config);
 230         struct dlm_msg *msg;
 231         int num_slots = 0;
 232         int error;
 233
 234         if (!dlm_slots_version(&rc_in->rc_header)) {
 235                 status = dlm_recover_status(ls);
 236                 goto do_create;
 237         }
 238
 239         rs = (struct rcom_status *)rc_in->rc_buf;
 240
 241         if (!(le32_to_cpu(rs->rs_flags) & DLM_RSF_NEED_SLOTS)) {
 242                 status = dlm_recover_status(ls);
 243                 goto do_create;
 244         }
 245
 246         spin_lock(&ls->ls_recover_lock);
 247         status = ls->ls_recover_status;
 248         num_slots = ls->ls_num_slots;
 249         spin_unlock(&ls->ls_recover_lock);
 250         len += num_slots * sizeof(struct rcom_slot);
 251
 252  do_create:
 253         error = create_rcom_stateless(ls, nodeid, DLM_RCOM_STATUS_REPLY,
 254                                       len, &rc, &msg);
 255         if (error)
 256                 return;
 257
 258         rc->rc_id = rc_in->rc_id;
 259         rc->rc_seq_reply = rc_in->rc_seq;
 260         rc->rc_result = cpu_to_le32(status);
 261
 262         set_rcom_config(ls, (struct rcom_config *)rc->rc_buf, num_slots);
 263
 264         if (!num_slots)
 265                 goto do_send;
 266
 267         spin_lock(&ls->ls_recover_lock);
 268         if (ls->ls_num_slots != num_slots) {
 269                 spin_unlock(&ls->ls_recover_lock);
 270                 log_debug(ls, "receive_rcom_status num_slots %d to %d",
 271                           num_slots, ls->ls_num_slots);
 272                 rc->rc_result = 0;
 273                 set_rcom_config(ls, (struct rcom_config *)rc->rc_buf, 0);
 274                 goto do_send;
 275         }
 276
 277         dlm_slots_copy_out(ls, rc);
 278         spin_unlock(&ls->ls_recover_lock);
 279
 280  do_send:
 281         send_rcom_stateless(msg, rc);
 282 }
 283
 284 static void receive_sync_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in)
 285 {
 286         spin_lock(&ls->ls_rcom_spin);
 287         if (!test_bit(LSFL_RCOM_WAIT, &ls->ls_flags) ||
 288             le64_to_cpu(rc_in->rc_id) != ls->ls_rcom_seq) {
 289                 log_debug(ls, "reject reply %d from %d seq %llx expect %llx",
 290                           le32_to_cpu(rc_in->rc_type),
 291                           le32_to_cpu(rc_in->rc_header.h_nodeid),
 292                           (unsigned long long)le64_to_cpu(rc_in->rc_id),
 293                           (unsigned long long)ls->ls_rcom_seq);
 294                 goto out;
 295         }
 296         memcpy(ls->ls_recover_buf, rc_in,
 297                le16_to_cpu(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 = le32_to_cpu(rc_in->rc_header.h_nodeid);
 340         inlen = le16_to_cpu(rc_in->rc_header.h_length) -
 341                 sizeof(struct dlm_rcom);
 342         outlen = DLM_MAX_APP_BUFSIZE - sizeof(struct dlm_rcom);
 343
 344         error = create_rcom_stateless(ls, nodeid, DLM_RCOM_NAMES_REPLY, outlen,
 345                                       &rc, &msg);
 346         if (error)
 347                 return;
 348         rc->rc_id = rc_in->rc_id;
 349         rc->rc_seq_reply = rc_in->rc_seq;
 350
 351         dlm_copy_master_names(ls, rc_in->rc_buf, inlen, rc->rc_buf, outlen,
 352                               nodeid);
 353         send_rcom_stateless(msg, rc);
 354 }
 355
 356 int dlm_send_rcom_lookup(struct dlm_rsb *r, int dir_nodeid)
 357 {
 358         struct dlm_rcom *rc;
 359         struct dlm_mhandle *mh;
 360         struct dlm_ls *ls = r->res_ls;
 361         int error;
 362
 363         error = create_rcom(ls, dir_nodeid, DLM_RCOM_LOOKUP, r->res_length,
 364                             &rc, &mh);
 365         if (error)
 366                 goto out;
 367         memcpy(rc->rc_buf, r->res_name, r->res_length);
 368         rc->rc_id = cpu_to_le64(r->res_id);
 369
 370         send_rcom(mh, rc);
 371  out:
 372         return error;
 373 }
 374
 375 static void receive_rcom_lookup(struct dlm_ls *ls, struct dlm_rcom *rc_in)
 376 {
 377         struct dlm_rcom *rc;
 378         struct dlm_mhandle *mh;
 379         int error, ret_nodeid, nodeid = le32_to_cpu(rc_in->rc_header.h_nodeid);
 380         int len = le16_to_cpu(rc_in->rc_header.h_length) -
 381                 sizeof(struct dlm_rcom);
 382
 383         /* Old code would send this special id to trigger a debug dump. */
 384         if (rc_in->rc_id == cpu_to_le64(0xFFFFFFFF)) {
 385                 log_error(ls, "receive_rcom_lookup dump from %d", nodeid);
 386                 dlm_dump_rsb_name(ls, rc_in->rc_buf, len);
 387                 return;
 388         }
 389
 390         error = create_rcom(ls, nodeid, DLM_RCOM_LOOKUP_REPLY, 0, &rc, &mh);
 391         if (error)
 392                 return;
 393
 394         error = dlm_master_lookup(ls, nodeid, rc_in->rc_buf, len,
 395                                   DLM_LU_RECOVER_MASTER, &ret_nodeid, NULL);
 396         if (error)
 397                 ret_nodeid = error;
 398         rc->rc_result = cpu_to_le32(ret_nodeid);
 399         rc->rc_id = rc_in->rc_id;
 400         rc->rc_seq_reply = rc_in->rc_seq;
 401
 402         send_rcom(mh, rc);
 403 }
 404
 405 static void receive_rcom_lookup_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in)
 406 {
 407         dlm_recover_master_reply(ls, rc_in);
 408 }
 409
 410 static void pack_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb,
 411                            struct rcom_lock *rl)
 412 {
 413         memset(rl, 0, sizeof(*rl));
 414
 415         rl->rl_ownpid = cpu_to_le32(lkb->lkb_ownpid);
 416         rl->rl_lkid = cpu_to_le32(lkb->lkb_id);
 417         rl->rl_exflags = cpu_to_le32(lkb->lkb_exflags);
 418         rl->rl_flags = cpu_to_le32(lkb->lkb_flags);
 419         rl->rl_lvbseq = cpu_to_le32(lkb->lkb_lvbseq);
 420         rl->rl_rqmode = lkb->lkb_rqmode;
 421         rl->rl_grmode = lkb->lkb_grmode;
 422         rl->rl_status = lkb->lkb_status;
 423         rl->rl_wait_type = cpu_to_le16(lkb->lkb_wait_type);
 424
 425         if (lkb->lkb_bastfn)
 426                 rl->rl_asts |= DLM_CB_BAST;
 427         if (lkb->lkb_astfn)
 428                 rl->rl_asts |= DLM_CB_CAST;
 429
 430         rl->rl_namelen = cpu_to_le16(r->res_length);
 431         memcpy(rl->rl_name, r->res_name, r->res_length);
 432
 433         /* FIXME: might we have an lvb without DLM_LKF_VALBLK set ?
 434            If so, receive_rcom_lock_args() won't take this copy. */
 435
 436         if (lkb->lkb_lvbptr)
 437                 memcpy(rl->rl_lvb, lkb->lkb_lvbptr, r->res_ls->ls_lvblen);
 438 }
 439
 440 int dlm_send_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
 441 {
 442         struct dlm_ls *ls = r->res_ls;
 443         struct dlm_rcom *rc;
 444         struct dlm_mhandle *mh;
 445         struct rcom_lock *rl;
 446         int error, len = sizeof(struct rcom_lock);
 447
 448         if (lkb->lkb_lvbptr)
 449                 len += ls->ls_lvblen;
 450
 451         error = create_rcom(ls, r->res_nodeid, DLM_RCOM_LOCK, len, &rc, &mh);
 452         if (error)
 453                 goto out;
 454
 455         rl = (struct rcom_lock *) rc->rc_buf;
 456         pack_rcom_lock(r, lkb, rl);
 457         rc->rc_id = cpu_to_le64((uintptr_t)r);
 458
 459         send_rcom(mh, rc);
 460  out:
 461         return error;
 462 }
 463
 464 /* needs at least dlm_rcom + rcom_lock */
 465 static void receive_rcom_lock(struct dlm_ls *ls, struct dlm_rcom *rc_in)
 466 {
 467         struct dlm_rcom *rc;
 468         struct dlm_mhandle *mh;
 469         int error, nodeid = le32_to_cpu(rc_in->rc_header.h_nodeid);
 470
 471         dlm_recover_master_copy(ls, rc_in);
 472
 473         error = create_rcom(ls, nodeid, DLM_RCOM_LOCK_REPLY,
 474                             sizeof(struct rcom_lock), &rc, &mh);
 475         if (error)
 476                 return;
 477
 478         /* We send back the same rcom_lock struct we received, but
 479            dlm_recover_master_copy() has filled in rl_remid and rl_result */
 480
 481         memcpy(rc->rc_buf, rc_in->rc_buf, sizeof(struct rcom_lock));
 482         rc->rc_id = rc_in->rc_id;
 483         rc->rc_seq_reply = rc_in->rc_seq;
 484
 485         send_rcom(mh, rc);
 486 }
 487
 488 /* If the lockspace doesn't exist then still send a status message
 489    back; it's possible that it just doesn't have its global_id yet. */
 490
 491 int dlm_send_ls_not_ready(int nodeid, struct dlm_rcom *rc_in)
 492 {
 493         struct dlm_rcom *rc;
 494         struct rcom_config *rf;
 495         struct dlm_mhandle *mh;
 496         char *mb;
 497         int mb_len = sizeof(struct dlm_rcom) + sizeof(struct rcom_config);
 498
 499         mh = dlm_midcomms_get_mhandle(nodeid, mb_len, GFP_NOFS, &mb);
 500         if (!mh)
 501                 return -ENOBUFS;
 502
 503         rc = (struct dlm_rcom *) mb;
 504
 505         rc->rc_header.h_version = cpu_to_le32(DLM_HEADER_MAJOR | DLM_HEADER_MINOR);
 506         rc->rc_header.u.h_lockspace = rc_in->rc_header.u.h_lockspace;
 507         rc->rc_header.h_nodeid = cpu_to_le32(dlm_our_nodeid());
 508         rc->rc_header.h_length = cpu_to_le16(mb_len);
 509         rc->rc_header.h_cmd = DLM_RCOM;
 510
 511         rc->rc_type = cpu_to_le32(DLM_RCOM_STATUS_REPLY);
 512         rc->rc_id = rc_in->rc_id;
 513         rc->rc_seq_reply = rc_in->rc_seq;
 514         rc->rc_result = cpu_to_le32(-ESRCH);
 515
 516         rf = (struct rcom_config *) rc->rc_buf;
 517         rf->rf_lvblen = cpu_to_le32(~0U);
 518
 519         dlm_midcomms_commit_mhandle(mh);
 520
 521         return 0;
 522 }
 523
 524 /*
 525  * Ignore messages for stage Y before we set
 526  * recover_status bit for stage X:
 527  *
 528  * recover_status = 0
 529  *
 530  * dlm_recover_members()
 531  * - send nothing
 532  * - recv nothing
 533  * - ignore NAMES, NAMES_REPLY
 534  * - ignore LOOKUP, LOOKUP_REPLY
 535  * - ignore LOCK, LOCK_REPLY
 536  *
 537  * recover_status |= NODES
 538  *
 539  * dlm_recover_members_wait()
 540  *
 541  * dlm_recover_directory()
 542  * - send NAMES
 543  * - recv NAMES_REPLY
 544  * - ignore LOOKUP, LOOKUP_REPLY
 545  * - ignore LOCK, LOCK_REPLY
 546  *
 547  * recover_status |= DIR
 548  *
 549  * dlm_recover_directory_wait()
 550  *
 551  * dlm_recover_masters()
 552  * - send LOOKUP
 553  * - recv LOOKUP_REPLY
 554  *
 555  * dlm_recover_locks()
 556  * - send LOCKS
 557  * - recv LOCKS_REPLY
 558  *
 559  * recover_status |= LOCKS
 560  *
 561  * dlm_recover_locks_wait()
 562  *
 563  * recover_status |= DONE
 564  */
 565
 566 /* Called by dlm_recv; corresponds to dlm_receive_message() but special
 567    recovery-only comms are sent through here. */
 568
 569 void dlm_receive_rcom(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid)
 570 {
 571         int lock_size = sizeof(struct dlm_rcom) + sizeof(struct rcom_lock);
 572         int stop, reply = 0, names = 0, lookup = 0, lock = 0;
 573         uint32_t status;
 574         uint64_t seq;
 575
 576         switch (rc->rc_type) {
 577         case cpu_to_le32(DLM_RCOM_STATUS_REPLY):
 578                 reply = 1;
 579                 break;
 580         case cpu_to_le32(DLM_RCOM_NAMES):
 581                 names = 1;
 582                 break;
 583         case cpu_to_le32(DLM_RCOM_NAMES_REPLY):
 584                 names = 1;
 585                 reply = 1;
 586                 break;
 587         case cpu_to_le32(DLM_RCOM_LOOKUP):
 588                 lookup = 1;
 589                 break;
 590         case cpu_to_le32(DLM_RCOM_LOOKUP_REPLY):
 591                 lookup = 1;
 592                 reply = 1;
 593                 break;
 594         case cpu_to_le32(DLM_RCOM_LOCK):
 595                 lock = 1;
 596                 break;
 597         case cpu_to_le32(DLM_RCOM_LOCK_REPLY):
 598                 lock = 1;
 599                 reply = 1;
 600                 break;
 601         }
 602
 603         spin_lock(&ls->ls_recover_lock);
 604         status = ls->ls_recover_status;
 605         stop = dlm_recovery_stopped(ls);
 606         seq = ls->ls_recover_seq;
 607         spin_unlock(&ls->ls_recover_lock);
 608
 609         if (stop && (rc->rc_type != cpu_to_le32(DLM_RCOM_STATUS)))
 610                 goto ignore;
 611
 612         if (reply && (le64_to_cpu(rc->rc_seq_reply) != seq))
 613                 goto ignore;
 614
 615         if (!(status & DLM_RS_NODES) && (names || lookup || lock))
 616                 goto ignore;
 617
 618         if (!(status & DLM_RS_DIR) && (lookup || lock))
 619                 goto ignore;
 620
 621         switch (rc->rc_type) {
 622         case cpu_to_le32(DLM_RCOM_STATUS):
 623                 receive_rcom_status(ls, rc);
 624                 break;
 625
 626         case cpu_to_le32(DLM_RCOM_NAMES):
 627                 receive_rcom_names(ls, rc);
 628                 break;
 629
 630         case cpu_to_le32(DLM_RCOM_LOOKUP):
 631                 receive_rcom_lookup(ls, rc);
 632                 break;
 633
 634         case cpu_to_le32(DLM_RCOM_LOCK):
 635                 if (le16_to_cpu(rc->rc_header.h_length) < lock_size)
 636                         goto Eshort;
 637                 receive_rcom_lock(ls, rc);
 638                 break;
 639
 640         case cpu_to_le32(DLM_RCOM_STATUS_REPLY):
 641                 receive_sync_reply(ls, rc);
 642                 break;
 643
 644         case cpu_to_le32(DLM_RCOM_NAMES_REPLY):
 645                 receive_sync_reply(ls, rc);
 646                 break;
 647
 648         case cpu_to_le32(DLM_RCOM_LOOKUP_REPLY):
 649                 receive_rcom_lookup_reply(ls, rc);
 650                 break;
 651
 652         case cpu_to_le32(DLM_RCOM_LOCK_REPLY):
 653                 if (le16_to_cpu(rc->rc_header.h_length) < lock_size)
 654                         goto Eshort;
 655                 dlm_recover_process_copy(ls, rc);
 656                 break;
 657
 658         default:
 659                 log_error(ls, "receive_rcom bad type %d",
 660                           le32_to_cpu(rc->rc_type));
 661         }
 662         return;
 663
 664 ignore:
 665         log_limit(ls, "dlm_receive_rcom ignore msg %d "
 666                   "from %d %llu %llu recover seq %llu sts %x gen %u",
 667                    le32_to_cpu(rc->rc_type),
 668                    nodeid,
 669                    (unsigned long long)le64_to_cpu(rc->rc_seq),
 670                    (unsigned long long)le64_to_cpu(rc->rc_seq_reply),
 671                    (unsigned long long)seq,
 672                    status, ls->ls_generation);
 673         return;
 674 Eshort:
 675         log_error(ls, "recovery message %d from %d is too short",
 676                   le32_to_cpu(rc->rc_type), nodeid);
 677 }
 678