1 /* 2 drbd_state.c 3 4 This file is part of DRBD by Philipp Reisner and Lars Ellenberg. 5 6 Copyright (C) 2001-2008, LINBIT Information Technologies GmbH. 7 Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>. 8 Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>. 9 10 Thanks to Carter Burden, Bart Grantham and Gennadiy Nerubayev 11 from Logicworks, Inc. for making SDP replication support possible. 12 13 drbd is free software; you can redistribute it and/or modify 14 it under the terms of the GNU General Public License as published by 15 the Free Software Foundation; either version 2, or (at your option) 16 any later version. 17 18 drbd is distributed in the hope that it will be useful, 19 but WITHOUT ANY WARRANTY; without even the implied warranty of 20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 GNU General Public License for more details. 22 23 You should have received a copy of the GNU General Public License 24 along with drbd; see the file COPYING. If not, write to 25 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 26 */ 27 28 #include <linux/drbd_limits.h> 29 #include "drbd_int.h" 30 #include "drbd_req.h" 31 32 /* in drbd_main.c */ 33 extern void tl_abort_disk_io(struct drbd_conf *mdev); 34 35 struct after_state_chg_work { 36 struct drbd_work w; 37 union drbd_state os; 38 union drbd_state ns; 39 enum chg_state_flags flags; 40 struct completion *done; 41 }; 42 43 enum sanitize_state_warnings { 44 NO_WARNING, 45 ABORTED_ONLINE_VERIFY, 46 ABORTED_RESYNC, 47 CONNECTION_LOST_NEGOTIATING, 48 IMPLICITLY_UPGRADED_DISK, 49 IMPLICITLY_UPGRADED_PDSK, 50 }; 51 52 static int w_after_state_ch(struct drbd_work *w, int unused); 53 static void after_state_ch(struct drbd_conf *mdev, union drbd_state os, 54 union drbd_state ns, enum chg_state_flags flags); 55 static enum drbd_state_rv is_valid_state(struct drbd_conf *, union drbd_state); 56 static enum drbd_state_rv is_valid_soft_transition(union drbd_state, union drbd_state, struct drbd_tconn *); 57 static enum drbd_state_rv is_valid_transition(union drbd_state os, union drbd_state ns); 58 static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state ns, 59 enum sanitize_state_warnings *warn); 60 61 static inline bool is_susp(union drbd_state s) 62 { 63 return s.susp || s.susp_nod || s.susp_fen; 64 } 65 66 bool conn_all_vols_unconf(struct drbd_tconn *tconn) 67 { 68 struct drbd_conf *mdev; 69 bool rv = true; 70 int vnr; 71 72 rcu_read_lock(); 73 idr_for_each_entry(&tconn->volumes, mdev, vnr) { 74 if (mdev->state.disk != D_DISKLESS || 75 mdev->state.conn != C_STANDALONE || 76 mdev->state.role != R_SECONDARY) { 77 rv = false; 78 break; 79 } 80 } 81 rcu_read_unlock(); 82 83 return rv; 84 } 85 86 /* Unfortunately the states where not correctly ordered, when 87 they where defined. therefore can not use max_t() here. */ 88 static enum drbd_role max_role(enum drbd_role role1, enum drbd_role role2) 89 { 90 if (role1 == R_PRIMARY || role2 == R_PRIMARY) 91 return R_PRIMARY; 92 if (role1 == R_SECONDARY || role2 == R_SECONDARY) 93 return R_SECONDARY; 94 return R_UNKNOWN; 95 } 96 static enum drbd_role min_role(enum drbd_role role1, enum drbd_role role2) 97 { 98 if (role1 == R_UNKNOWN || role2 == R_UNKNOWN) 99 return R_UNKNOWN; 100 if (role1 == R_SECONDARY || role2 == R_SECONDARY) 101 return R_SECONDARY; 102 return R_PRIMARY; 103 } 104 105 enum drbd_role conn_highest_role(struct drbd_tconn *tconn) 106 { 107 enum drbd_role role = R_UNKNOWN; 108 struct drbd_conf *mdev; 109 int vnr; 110 111 rcu_read_lock(); 112 idr_for_each_entry(&tconn->volumes, mdev, vnr) 113 role = max_role(role, mdev->state.role); 114 rcu_read_unlock(); 115 116 return role; 117 } 118 119 enum drbd_role conn_highest_peer(struct drbd_tconn *tconn) 120 { 121 enum drbd_role peer = R_UNKNOWN; 122 struct drbd_conf *mdev; 123 int vnr; 124 125 rcu_read_lock(); 126 idr_for_each_entry(&tconn->volumes, mdev, vnr) 127 peer = max_role(peer, mdev->state.peer); 128 rcu_read_unlock(); 129 130 return peer; 131 } 132 133 enum drbd_disk_state conn_highest_disk(struct drbd_tconn *tconn) 134 { 135 enum drbd_disk_state ds = D_DISKLESS; 136 struct drbd_conf *mdev; 137 int vnr; 138 139 rcu_read_lock(); 140 idr_for_each_entry(&tconn->volumes, mdev, vnr) 141 ds = max_t(enum drbd_disk_state, ds, mdev->state.disk); 142 rcu_read_unlock(); 143 144 return ds; 145 } 146 147 enum drbd_disk_state conn_lowest_disk(struct drbd_tconn *tconn) 148 { 149 enum drbd_disk_state ds = D_MASK; 150 struct drbd_conf *mdev; 151 int vnr; 152 153 rcu_read_lock(); 154 idr_for_each_entry(&tconn->volumes, mdev, vnr) 155 ds = min_t(enum drbd_disk_state, ds, mdev->state.disk); 156 rcu_read_unlock(); 157 158 return ds; 159 } 160 161 enum drbd_disk_state conn_highest_pdsk(struct drbd_tconn *tconn) 162 { 163 enum drbd_disk_state ds = D_DISKLESS; 164 struct drbd_conf *mdev; 165 int vnr; 166 167 rcu_read_lock(); 168 idr_for_each_entry(&tconn->volumes, mdev, vnr) 169 ds = max_t(enum drbd_disk_state, ds, mdev->state.pdsk); 170 rcu_read_unlock(); 171 172 return ds; 173 } 174 175 enum drbd_conns conn_lowest_conn(struct drbd_tconn *tconn) 176 { 177 enum drbd_conns conn = C_MASK; 178 struct drbd_conf *mdev; 179 int vnr; 180 181 rcu_read_lock(); 182 idr_for_each_entry(&tconn->volumes, mdev, vnr) 183 conn = min_t(enum drbd_conns, conn, mdev->state.conn); 184 rcu_read_unlock(); 185 186 return conn; 187 } 188 189 static bool no_peer_wf_report_params(struct drbd_tconn *tconn) 190 { 191 struct drbd_conf *mdev; 192 int vnr; 193 bool rv = true; 194 195 rcu_read_lock(); 196 idr_for_each_entry(&tconn->volumes, mdev, vnr) 197 if (mdev->state.conn == C_WF_REPORT_PARAMS) { 198 rv = false; 199 break; 200 } 201 rcu_read_unlock(); 202 203 return rv; 204 } 205 206 207 /** 208 * cl_wide_st_chg() - true if the state change is a cluster wide one 209 * @mdev: DRBD device. 210 * @os: old (current) state. 211 * @ns: new (wanted) state. 212 */ 213 static int cl_wide_st_chg(struct drbd_conf *mdev, 214 union drbd_state os, union drbd_state ns) 215 { 216 return (os.conn >= C_CONNECTED && ns.conn >= C_CONNECTED && 217 ((os.role != R_PRIMARY && ns.role == R_PRIMARY) || 218 (os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) || 219 (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S) || 220 (os.disk != D_FAILED && ns.disk == D_FAILED))) || 221 (os.conn >= C_CONNECTED && ns.conn == C_DISCONNECTING) || 222 (os.conn == C_CONNECTED && ns.conn == C_VERIFY_S) || 223 (os.conn == C_CONNECTED && ns.conn == C_WF_REPORT_PARAMS); 224 } 225 226 static union drbd_state 227 apply_mask_val(union drbd_state os, union drbd_state mask, union drbd_state val) 228 { 229 union drbd_state ns; 230 ns.i = (os.i & ~mask.i) | val.i; 231 return ns; 232 } 233 234 enum drbd_state_rv 235 drbd_change_state(struct drbd_conf *mdev, enum chg_state_flags f, 236 union drbd_state mask, union drbd_state val) 237 { 238 unsigned long flags; 239 union drbd_state ns; 240 enum drbd_state_rv rv; 241 242 spin_lock_irqsave(&mdev->tconn->req_lock, flags); 243 ns = apply_mask_val(drbd_read_state(mdev), mask, val); 244 rv = _drbd_set_state(mdev, ns, f, NULL); 245 spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); 246 247 return rv; 248 } 249 250 /** 251 * drbd_force_state() - Impose a change which happens outside our control on our state 252 * @mdev: DRBD device. 253 * @mask: mask of state bits to change. 254 * @val: value of new state bits. 255 */ 256 void drbd_force_state(struct drbd_conf *mdev, 257 union drbd_state mask, union drbd_state val) 258 { 259 drbd_change_state(mdev, CS_HARD, mask, val); 260 } 261 262 static enum drbd_state_rv 263 _req_st_cond(struct drbd_conf *mdev, union drbd_state mask, 264 union drbd_state val) 265 { 266 union drbd_state os, ns; 267 unsigned long flags; 268 enum drbd_state_rv rv; 269 270 if (test_and_clear_bit(CL_ST_CHG_SUCCESS, &mdev->flags)) 271 return SS_CW_SUCCESS; 272 273 if (test_and_clear_bit(CL_ST_CHG_FAIL, &mdev->flags)) 274 return SS_CW_FAILED_BY_PEER; 275 276 spin_lock_irqsave(&mdev->tconn->req_lock, flags); 277 os = drbd_read_state(mdev); 278 ns = sanitize_state(mdev, apply_mask_val(os, mask, val), NULL); 279 rv = is_valid_transition(os, ns); 280 if (rv >= SS_SUCCESS) 281 rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */ 282 283 if (!cl_wide_st_chg(mdev, os, ns)) 284 rv = SS_CW_NO_NEED; 285 if (rv == SS_UNKNOWN_ERROR) { 286 rv = is_valid_state(mdev, ns); 287 if (rv >= SS_SUCCESS) { 288 rv = is_valid_soft_transition(os, ns, mdev->tconn); 289 if (rv >= SS_SUCCESS) 290 rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */ 291 } 292 } 293 spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); 294 295 return rv; 296 } 297 298 /** 299 * drbd_req_state() - Perform an eventually cluster wide state change 300 * @mdev: DRBD device. 301 * @mask: mask of state bits to change. 302 * @val: value of new state bits. 303 * @f: flags 304 * 305 * Should not be called directly, use drbd_request_state() or 306 * _drbd_request_state(). 307 */ 308 static enum drbd_state_rv 309 drbd_req_state(struct drbd_conf *mdev, union drbd_state mask, 310 union drbd_state val, enum chg_state_flags f) 311 { 312 struct completion done; 313 unsigned long flags; 314 union drbd_state os, ns; 315 enum drbd_state_rv rv; 316 317 init_completion(&done); 318 319 if (f & CS_SERIALIZE) 320 mutex_lock(mdev->state_mutex); 321 322 spin_lock_irqsave(&mdev->tconn->req_lock, flags); 323 os = drbd_read_state(mdev); 324 ns = sanitize_state(mdev, apply_mask_val(os, mask, val), NULL); 325 rv = is_valid_transition(os, ns); 326 if (rv < SS_SUCCESS) { 327 spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); 328 goto abort; 329 } 330 331 if (cl_wide_st_chg(mdev, os, ns)) { 332 rv = is_valid_state(mdev, ns); 333 if (rv == SS_SUCCESS) 334 rv = is_valid_soft_transition(os, ns, mdev->tconn); 335 spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); 336 337 if (rv < SS_SUCCESS) { 338 if (f & CS_VERBOSE) 339 print_st_err(mdev, os, ns, rv); 340 goto abort; 341 } 342 343 if (drbd_send_state_req(mdev, mask, val)) { 344 rv = SS_CW_FAILED_BY_PEER; 345 if (f & CS_VERBOSE) 346 print_st_err(mdev, os, ns, rv); 347 goto abort; 348 } 349 350 wait_event(mdev->state_wait, 351 (rv = _req_st_cond(mdev, mask, val))); 352 353 if (rv < SS_SUCCESS) { 354 if (f & CS_VERBOSE) 355 print_st_err(mdev, os, ns, rv); 356 goto abort; 357 } 358 spin_lock_irqsave(&mdev->tconn->req_lock, flags); 359 ns = apply_mask_val(drbd_read_state(mdev), mask, val); 360 rv = _drbd_set_state(mdev, ns, f, &done); 361 } else { 362 rv = _drbd_set_state(mdev, ns, f, &done); 363 } 364 365 spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); 366 367 if (f & CS_WAIT_COMPLETE && rv == SS_SUCCESS) { 368 D_ASSERT(current != mdev->tconn->worker.task); 369 wait_for_completion(&done); 370 } 371 372 abort: 373 if (f & CS_SERIALIZE) 374 mutex_unlock(mdev->state_mutex); 375 376 return rv; 377 } 378 379 /** 380 * _drbd_request_state() - Request a state change (with flags) 381 * @mdev: DRBD device. 382 * @mask: mask of state bits to change. 383 * @val: value of new state bits. 384 * @f: flags 385 * 386 * Cousin of drbd_request_state(), useful with the CS_WAIT_COMPLETE 387 * flag, or when logging of failed state change requests is not desired. 388 */ 389 enum drbd_state_rv 390 _drbd_request_state(struct drbd_conf *mdev, union drbd_state mask, 391 union drbd_state val, enum chg_state_flags f) 392 { 393 enum drbd_state_rv rv; 394 395 wait_event(mdev->state_wait, 396 (rv = drbd_req_state(mdev, mask, val, f)) != SS_IN_TRANSIENT_STATE); 397 398 return rv; 399 } 400 401 static void print_st(struct drbd_conf *mdev, char *name, union drbd_state ns) 402 { 403 dev_err(DEV, " %s = { cs:%s ro:%s/%s ds:%s/%s %c%c%c%c%c%c }\n", 404 name, 405 drbd_conn_str(ns.conn), 406 drbd_role_str(ns.role), 407 drbd_role_str(ns.peer), 408 drbd_disk_str(ns.disk), 409 drbd_disk_str(ns.pdsk), 410 is_susp(ns) ? 's' : 'r', 411 ns.aftr_isp ? 'a' : '-', 412 ns.peer_isp ? 'p' : '-', 413 ns.user_isp ? 'u' : '-', 414 ns.susp_fen ? 'F' : '-', 415 ns.susp_nod ? 'N' : '-' 416 ); 417 } 418 419 void print_st_err(struct drbd_conf *mdev, union drbd_state os, 420 union drbd_state ns, enum drbd_state_rv err) 421 { 422 if (err == SS_IN_TRANSIENT_STATE) 423 return; 424 dev_err(DEV, "State change failed: %s\n", drbd_set_st_err_str(err)); 425 print_st(mdev, " state", os); 426 print_st(mdev, "wanted", ns); 427 } 428 429 static long print_state_change(char *pb, union drbd_state os, union drbd_state ns, 430 enum chg_state_flags flags) 431 { 432 char *pbp; 433 pbp = pb; 434 *pbp = 0; 435 436 if (ns.role != os.role && flags & CS_DC_ROLE) 437 pbp += sprintf(pbp, "role( %s -> %s ) ", 438 drbd_role_str(os.role), 439 drbd_role_str(ns.role)); 440 if (ns.peer != os.peer && flags & CS_DC_PEER) 441 pbp += sprintf(pbp, "peer( %s -> %s ) ", 442 drbd_role_str(os.peer), 443 drbd_role_str(ns.peer)); 444 if (ns.conn != os.conn && flags & CS_DC_CONN) 445 pbp += sprintf(pbp, "conn( %s -> %s ) ", 446 drbd_conn_str(os.conn), 447 drbd_conn_str(ns.conn)); 448 if (ns.disk != os.disk && flags & CS_DC_DISK) 449 pbp += sprintf(pbp, "disk( %s -> %s ) ", 450 drbd_disk_str(os.disk), 451 drbd_disk_str(ns.disk)); 452 if (ns.pdsk != os.pdsk && flags & CS_DC_PDSK) 453 pbp += sprintf(pbp, "pdsk( %s -> %s ) ", 454 drbd_disk_str(os.pdsk), 455 drbd_disk_str(ns.pdsk)); 456 457 return pbp - pb; 458 } 459 460 static void drbd_pr_state_change(struct drbd_conf *mdev, union drbd_state os, union drbd_state ns, 461 enum chg_state_flags flags) 462 { 463 char pb[300]; 464 char *pbp = pb; 465 466 pbp += print_state_change(pbp, os, ns, flags ^ CS_DC_MASK); 467 468 if (ns.aftr_isp != os.aftr_isp) 469 pbp += sprintf(pbp, "aftr_isp( %d -> %d ) ", 470 os.aftr_isp, 471 ns.aftr_isp); 472 if (ns.peer_isp != os.peer_isp) 473 pbp += sprintf(pbp, "peer_isp( %d -> %d ) ", 474 os.peer_isp, 475 ns.peer_isp); 476 if (ns.user_isp != os.user_isp) 477 pbp += sprintf(pbp, "user_isp( %d -> %d ) ", 478 os.user_isp, 479 ns.user_isp); 480 481 if (pbp != pb) 482 dev_info(DEV, "%s\n", pb); 483 } 484 485 static void conn_pr_state_change(struct drbd_tconn *tconn, union drbd_state os, union drbd_state ns, 486 enum chg_state_flags flags) 487 { 488 char pb[300]; 489 char *pbp = pb; 490 491 pbp += print_state_change(pbp, os, ns, flags); 492 493 if (is_susp(ns) != is_susp(os) && flags & CS_DC_SUSP) 494 pbp += sprintf(pbp, "susp( %d -> %d ) ", 495 is_susp(os), 496 is_susp(ns)); 497 498 if (pbp != pb) 499 conn_info(tconn, "%s\n", pb); 500 } 501 502 503 /** 504 * is_valid_state() - Returns an SS_ error code if ns is not valid 505 * @mdev: DRBD device. 506 * @ns: State to consider. 507 */ 508 static enum drbd_state_rv 509 is_valid_state(struct drbd_conf *mdev, union drbd_state ns) 510 { 511 /* See drbd_state_sw_errors in drbd_strings.c */ 512 513 enum drbd_fencing_p fp; 514 enum drbd_state_rv rv = SS_SUCCESS; 515 struct net_conf *nc; 516 517 rcu_read_lock(); 518 fp = FP_DONT_CARE; 519 if (get_ldev(mdev)) { 520 fp = rcu_dereference(mdev->ldev->disk_conf)->fencing; 521 put_ldev(mdev); 522 } 523 524 nc = rcu_dereference(mdev->tconn->net_conf); 525 if (nc) { 526 if (!nc->two_primaries && ns.role == R_PRIMARY) { 527 if (ns.peer == R_PRIMARY) 528 rv = SS_TWO_PRIMARIES; 529 else if (conn_highest_peer(mdev->tconn) == R_PRIMARY) 530 rv = SS_O_VOL_PEER_PRI; 531 } 532 } 533 534 if (rv <= 0) 535 /* already found a reason to abort */; 536 else if (ns.role == R_SECONDARY && mdev->open_cnt) 537 rv = SS_DEVICE_IN_USE; 538 539 else if (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.disk < D_UP_TO_DATE) 540 rv = SS_NO_UP_TO_DATE_DISK; 541 542 else if (fp >= FP_RESOURCE && 543 ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk >= D_UNKNOWN) 544 rv = SS_PRIMARY_NOP; 545 546 else if (ns.role == R_PRIMARY && ns.disk <= D_INCONSISTENT && ns.pdsk <= D_INCONSISTENT) 547 rv = SS_NO_UP_TO_DATE_DISK; 548 549 else if (ns.conn > C_CONNECTED && ns.disk < D_INCONSISTENT) 550 rv = SS_NO_LOCAL_DISK; 551 552 else if (ns.conn > C_CONNECTED && ns.pdsk < D_INCONSISTENT) 553 rv = SS_NO_REMOTE_DISK; 554 555 else if (ns.conn > C_CONNECTED && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE) 556 rv = SS_NO_UP_TO_DATE_DISK; 557 558 else if ((ns.conn == C_CONNECTED || 559 ns.conn == C_WF_BITMAP_S || 560 ns.conn == C_SYNC_SOURCE || 561 ns.conn == C_PAUSED_SYNC_S) && 562 ns.disk == D_OUTDATED) 563 rv = SS_CONNECTED_OUTDATES; 564 565 else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && 566 (nc->verify_alg[0] == 0)) 567 rv = SS_NO_VERIFY_ALG; 568 569 else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && 570 mdev->tconn->agreed_pro_version < 88) 571 rv = SS_NOT_SUPPORTED; 572 573 else if (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE) 574 rv = SS_NO_UP_TO_DATE_DISK; 575 576 else if ((ns.conn == C_STARTING_SYNC_S || ns.conn == C_STARTING_SYNC_T) && 577 ns.pdsk == D_UNKNOWN) 578 rv = SS_NEED_CONNECTION; 579 580 else if (ns.conn >= C_CONNECTED && ns.pdsk == D_UNKNOWN) 581 rv = SS_CONNECTED_OUTDATES; 582 583 rcu_read_unlock(); 584 585 return rv; 586 } 587 588 /** 589 * is_valid_soft_transition() - Returns an SS_ error code if the state transition is not possible 590 * This function limits state transitions that may be declined by DRBD. I.e. 591 * user requests (aka soft transitions). 592 * @mdev: DRBD device. 593 * @ns: new state. 594 * @os: old state. 595 */ 596 static enum drbd_state_rv 597 is_valid_soft_transition(union drbd_state os, union drbd_state ns, struct drbd_tconn *tconn) 598 { 599 enum drbd_state_rv rv = SS_SUCCESS; 600 601 if ((ns.conn == C_STARTING_SYNC_T || ns.conn == C_STARTING_SYNC_S) && 602 os.conn > C_CONNECTED) 603 rv = SS_RESYNC_RUNNING; 604 605 if (ns.conn == C_DISCONNECTING && os.conn == C_STANDALONE) 606 rv = SS_ALREADY_STANDALONE; 607 608 if (ns.disk > D_ATTACHING && os.disk == D_DISKLESS) 609 rv = SS_IS_DISKLESS; 610 611 if (ns.conn == C_WF_CONNECTION && os.conn < C_UNCONNECTED) 612 rv = SS_NO_NET_CONFIG; 613 614 if (ns.disk == D_OUTDATED && os.disk < D_OUTDATED && os.disk != D_ATTACHING) 615 rv = SS_LOWER_THAN_OUTDATED; 616 617 if (ns.conn == C_DISCONNECTING && os.conn == C_UNCONNECTED) 618 rv = SS_IN_TRANSIENT_STATE; 619 620 /* if (ns.conn == os.conn && ns.conn == C_WF_REPORT_PARAMS) 621 rv = SS_IN_TRANSIENT_STATE; */ 622 623 /* While establishing a connection only allow cstate to change. 624 Delay/refuse role changes, detach attach etc... */ 625 if (test_bit(STATE_SENT, &tconn->flags) && 626 !(os.conn == C_WF_REPORT_PARAMS || 627 (ns.conn == C_WF_REPORT_PARAMS && os.conn == C_WF_CONNECTION))) 628 rv = SS_IN_TRANSIENT_STATE; 629 630 if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && os.conn < C_CONNECTED) 631 rv = SS_NEED_CONNECTION; 632 633 if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && 634 ns.conn != os.conn && os.conn > C_CONNECTED) 635 rv = SS_RESYNC_RUNNING; 636 637 if ((ns.conn == C_STARTING_SYNC_S || ns.conn == C_STARTING_SYNC_T) && 638 os.conn < C_CONNECTED) 639 rv = SS_NEED_CONNECTION; 640 641 if ((ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE) 642 && os.conn < C_WF_REPORT_PARAMS) 643 rv = SS_NEED_CONNECTION; /* No NetworkFailure -> SyncTarget etc... */ 644 645 if (ns.conn == C_DISCONNECTING && ns.pdsk == D_OUTDATED && 646 os.conn < C_CONNECTED && os.pdsk > D_OUTDATED) 647 rv = SS_OUTDATE_WO_CONN; 648 649 return rv; 650 } 651 652 static enum drbd_state_rv 653 is_valid_conn_transition(enum drbd_conns oc, enum drbd_conns nc) 654 { 655 /* no change -> nothing to do, at least for the connection part */ 656 if (oc == nc) 657 return SS_NOTHING_TO_DO; 658 659 /* disconnect of an unconfigured connection does not make sense */ 660 if (oc == C_STANDALONE && nc == C_DISCONNECTING) 661 return SS_ALREADY_STANDALONE; 662 663 /* from C_STANDALONE, we start with C_UNCONNECTED */ 664 if (oc == C_STANDALONE && nc != C_UNCONNECTED) 665 return SS_NEED_CONNECTION; 666 667 /* When establishing a connection we need to go through WF_REPORT_PARAMS! 668 Necessary to do the right thing upon invalidate-remote on a disconnected resource */ 669 if (oc < C_WF_REPORT_PARAMS && nc >= C_CONNECTED) 670 return SS_NEED_CONNECTION; 671 672 /* After a network error only C_UNCONNECTED or C_DISCONNECTING may follow. */ 673 if (oc >= C_TIMEOUT && oc <= C_TEAR_DOWN && nc != C_UNCONNECTED && nc != C_DISCONNECTING) 674 return SS_IN_TRANSIENT_STATE; 675 676 /* After C_DISCONNECTING only C_STANDALONE may follow */ 677 if (oc == C_DISCONNECTING && nc != C_STANDALONE) 678 return SS_IN_TRANSIENT_STATE; 679 680 return SS_SUCCESS; 681 } 682 683 684 /** 685 * is_valid_transition() - Returns an SS_ error code if the state transition is not possible 686 * This limits hard state transitions. Hard state transitions are facts there are 687 * imposed on DRBD by the environment. E.g. disk broke or network broke down. 688 * But those hard state transitions are still not allowed to do everything. 689 * @ns: new state. 690 * @os: old state. 691 */ 692 static enum drbd_state_rv 693 is_valid_transition(union drbd_state os, union drbd_state ns) 694 { 695 enum drbd_state_rv rv; 696 697 rv = is_valid_conn_transition(os.conn, ns.conn); 698 699 /* we cannot fail (again) if we already detached */ 700 if (ns.disk == D_FAILED && os.disk == D_DISKLESS) 701 rv = SS_IS_DISKLESS; 702 703 return rv; 704 } 705 706 static void print_sanitize_warnings(struct drbd_conf *mdev, enum sanitize_state_warnings warn) 707 { 708 static const char *msg_table[] = { 709 [NO_WARNING] = "", 710 [ABORTED_ONLINE_VERIFY] = "Online-verify aborted.", 711 [ABORTED_RESYNC] = "Resync aborted.", 712 [CONNECTION_LOST_NEGOTIATING] = "Connection lost while negotiating, no data!", 713 [IMPLICITLY_UPGRADED_DISK] = "Implicitly upgraded disk", 714 [IMPLICITLY_UPGRADED_PDSK] = "Implicitly upgraded pdsk", 715 }; 716 717 if (warn != NO_WARNING) 718 dev_warn(DEV, "%s\n", msg_table[warn]); 719 } 720 721 /** 722 * sanitize_state() - Resolves implicitly necessary additional changes to a state transition 723 * @mdev: DRBD device. 724 * @os: old state. 725 * @ns: new state. 726 * @warn_sync_abort: 727 * 728 * When we loose connection, we have to set the state of the peers disk (pdsk) 729 * to D_UNKNOWN. This rule and many more along those lines are in this function. 730 */ 731 static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state ns, 732 enum sanitize_state_warnings *warn) 733 { 734 enum drbd_fencing_p fp; 735 enum drbd_disk_state disk_min, disk_max, pdsk_min, pdsk_max; 736 737 if (warn) 738 *warn = NO_WARNING; 739 740 fp = FP_DONT_CARE; 741 if (get_ldev(mdev)) { 742 rcu_read_lock(); 743 fp = rcu_dereference(mdev->ldev->disk_conf)->fencing; 744 rcu_read_unlock(); 745 put_ldev(mdev); 746 } 747 748 /* Implications from connection to peer and peer_isp */ 749 if (ns.conn < C_CONNECTED) { 750 ns.peer_isp = 0; 751 ns.peer = R_UNKNOWN; 752 if (ns.pdsk > D_UNKNOWN || ns.pdsk < D_INCONSISTENT) 753 ns.pdsk = D_UNKNOWN; 754 } 755 756 /* Clear the aftr_isp when becoming unconfigured */ 757 if (ns.conn == C_STANDALONE && ns.disk == D_DISKLESS && ns.role == R_SECONDARY) 758 ns.aftr_isp = 0; 759 760 /* An implication of the disk states onto the connection state */ 761 /* Abort resync if a disk fails/detaches */ 762 if (ns.conn > C_CONNECTED && (ns.disk <= D_FAILED || ns.pdsk <= D_FAILED)) { 763 if (warn) 764 *warn = ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T ? 765 ABORTED_ONLINE_VERIFY : ABORTED_RESYNC; 766 ns.conn = C_CONNECTED; 767 } 768 769 /* Connection breaks down before we finished "Negotiating" */ 770 if (ns.conn < C_CONNECTED && ns.disk == D_NEGOTIATING && 771 get_ldev_if_state(mdev, D_NEGOTIATING)) { 772 if (mdev->ed_uuid == mdev->ldev->md.uuid[UI_CURRENT]) { 773 ns.disk = mdev->new_state_tmp.disk; 774 ns.pdsk = mdev->new_state_tmp.pdsk; 775 } else { 776 if (warn) 777 *warn = CONNECTION_LOST_NEGOTIATING; 778 ns.disk = D_DISKLESS; 779 ns.pdsk = D_UNKNOWN; 780 } 781 put_ldev(mdev); 782 } 783 784 /* D_CONSISTENT and D_OUTDATED vanish when we get connected */ 785 if (ns.conn >= C_CONNECTED && ns.conn < C_AHEAD) { 786 if (ns.disk == D_CONSISTENT || ns.disk == D_OUTDATED) 787 ns.disk = D_UP_TO_DATE; 788 if (ns.pdsk == D_CONSISTENT || ns.pdsk == D_OUTDATED) 789 ns.pdsk = D_UP_TO_DATE; 790 } 791 792 /* Implications of the connection stat on the disk states */ 793 disk_min = D_DISKLESS; 794 disk_max = D_UP_TO_DATE; 795 pdsk_min = D_INCONSISTENT; 796 pdsk_max = D_UNKNOWN; 797 switch ((enum drbd_conns)ns.conn) { 798 case C_WF_BITMAP_T: 799 case C_PAUSED_SYNC_T: 800 case C_STARTING_SYNC_T: 801 case C_WF_SYNC_UUID: 802 case C_BEHIND: 803 disk_min = D_INCONSISTENT; 804 disk_max = D_OUTDATED; 805 pdsk_min = D_UP_TO_DATE; 806 pdsk_max = D_UP_TO_DATE; 807 break; 808 case C_VERIFY_S: 809 case C_VERIFY_T: 810 disk_min = D_UP_TO_DATE; 811 disk_max = D_UP_TO_DATE; 812 pdsk_min = D_UP_TO_DATE; 813 pdsk_max = D_UP_TO_DATE; 814 break; 815 case C_CONNECTED: 816 disk_min = D_DISKLESS; 817 disk_max = D_UP_TO_DATE; 818 pdsk_min = D_DISKLESS; 819 pdsk_max = D_UP_TO_DATE; 820 break; 821 case C_WF_BITMAP_S: 822 case C_PAUSED_SYNC_S: 823 case C_STARTING_SYNC_S: 824 case C_AHEAD: 825 disk_min = D_UP_TO_DATE; 826 disk_max = D_UP_TO_DATE; 827 pdsk_min = D_INCONSISTENT; 828 pdsk_max = D_CONSISTENT; /* D_OUTDATED would be nice. But explicit outdate necessary*/ 829 break; 830 case C_SYNC_TARGET: 831 disk_min = D_INCONSISTENT; 832 disk_max = D_INCONSISTENT; 833 pdsk_min = D_UP_TO_DATE; 834 pdsk_max = D_UP_TO_DATE; 835 break; 836 case C_SYNC_SOURCE: 837 disk_min = D_UP_TO_DATE; 838 disk_max = D_UP_TO_DATE; 839 pdsk_min = D_INCONSISTENT; 840 pdsk_max = D_INCONSISTENT; 841 break; 842 case C_STANDALONE: 843 case C_DISCONNECTING: 844 case C_UNCONNECTED: 845 case C_TIMEOUT: 846 case C_BROKEN_PIPE: 847 case C_NETWORK_FAILURE: 848 case C_PROTOCOL_ERROR: 849 case C_TEAR_DOWN: 850 case C_WF_CONNECTION: 851 case C_WF_REPORT_PARAMS: 852 case C_MASK: 853 break; 854 } 855 if (ns.disk > disk_max) 856 ns.disk = disk_max; 857 858 if (ns.disk < disk_min) { 859 if (warn) 860 *warn = IMPLICITLY_UPGRADED_DISK; 861 ns.disk = disk_min; 862 } 863 if (ns.pdsk > pdsk_max) 864 ns.pdsk = pdsk_max; 865 866 if (ns.pdsk < pdsk_min) { 867 if (warn) 868 *warn = IMPLICITLY_UPGRADED_PDSK; 869 ns.pdsk = pdsk_min; 870 } 871 872 if (fp == FP_STONITH && 873 (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk > D_OUTDATED)) 874 ns.susp_fen = 1; /* Suspend IO while fence-peer handler runs (peer lost) */ 875 876 if (mdev->tconn->res_opts.on_no_data == OND_SUSPEND_IO && 877 (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE)) 878 ns.susp_nod = 1; /* Suspend IO while no data available (no accessible data available) */ 879 880 if (ns.aftr_isp || ns.peer_isp || ns.user_isp) { 881 if (ns.conn == C_SYNC_SOURCE) 882 ns.conn = C_PAUSED_SYNC_S; 883 if (ns.conn == C_SYNC_TARGET) 884 ns.conn = C_PAUSED_SYNC_T; 885 } else { 886 if (ns.conn == C_PAUSED_SYNC_S) 887 ns.conn = C_SYNC_SOURCE; 888 if (ns.conn == C_PAUSED_SYNC_T) 889 ns.conn = C_SYNC_TARGET; 890 } 891 892 return ns; 893 } 894 895 void drbd_resume_al(struct drbd_conf *mdev) 896 { 897 if (test_and_clear_bit(AL_SUSPENDED, &mdev->flags)) 898 dev_info(DEV, "Resumed AL updates\n"); 899 } 900 901 /* helper for __drbd_set_state */ 902 static void set_ov_position(struct drbd_conf *mdev, enum drbd_conns cs) 903 { 904 if (mdev->tconn->agreed_pro_version < 90) 905 mdev->ov_start_sector = 0; 906 mdev->rs_total = drbd_bm_bits(mdev); 907 mdev->ov_position = 0; 908 if (cs == C_VERIFY_T) { 909 /* starting online verify from an arbitrary position 910 * does not fit well into the existing protocol. 911 * on C_VERIFY_T, we initialize ov_left and friends 912 * implicitly in receive_DataRequest once the 913 * first P_OV_REQUEST is received */ 914 mdev->ov_start_sector = ~(sector_t)0; 915 } else { 916 unsigned long bit = BM_SECT_TO_BIT(mdev->ov_start_sector); 917 if (bit >= mdev->rs_total) { 918 mdev->ov_start_sector = 919 BM_BIT_TO_SECT(mdev->rs_total - 1); 920 mdev->rs_total = 1; 921 } else 922 mdev->rs_total -= bit; 923 mdev->ov_position = mdev->ov_start_sector; 924 } 925 mdev->ov_left = mdev->rs_total; 926 } 927 928 /** 929 * __drbd_set_state() - Set a new DRBD state 930 * @mdev: DRBD device. 931 * @ns: new state. 932 * @flags: Flags 933 * @done: Optional completion, that will get completed after the after_state_ch() finished 934 * 935 * Caller needs to hold req_lock, and global_state_lock. Do not call directly. 936 */ 937 enum drbd_state_rv 938 __drbd_set_state(struct drbd_conf *mdev, union drbd_state ns, 939 enum chg_state_flags flags, struct completion *done) 940 { 941 union drbd_state os; 942 enum drbd_state_rv rv = SS_SUCCESS; 943 enum sanitize_state_warnings ssw; 944 struct after_state_chg_work *ascw; 945 bool did_remote, should_do_remote; 946 947 os = drbd_read_state(mdev); 948 949 ns = sanitize_state(mdev, ns, &ssw); 950 if (ns.i == os.i) 951 return SS_NOTHING_TO_DO; 952 953 rv = is_valid_transition(os, ns); 954 if (rv < SS_SUCCESS) 955 return rv; 956 957 if (!(flags & CS_HARD)) { 958 /* pre-state-change checks ; only look at ns */ 959 /* See drbd_state_sw_errors in drbd_strings.c */ 960 961 rv = is_valid_state(mdev, ns); 962 if (rv < SS_SUCCESS) { 963 /* If the old state was illegal as well, then let 964 this happen...*/ 965 966 if (is_valid_state(mdev, os) == rv) 967 rv = is_valid_soft_transition(os, ns, mdev->tconn); 968 } else 969 rv = is_valid_soft_transition(os, ns, mdev->tconn); 970 } 971 972 if (rv < SS_SUCCESS) { 973 if (flags & CS_VERBOSE) 974 print_st_err(mdev, os, ns, rv); 975 return rv; 976 } 977 978 print_sanitize_warnings(mdev, ssw); 979 980 drbd_pr_state_change(mdev, os, ns, flags); 981 982 /* Display changes to the susp* flags that where caused by the call to 983 sanitize_state(). Only display it here if we where not called from 984 _conn_request_state() */ 985 if (!(flags & CS_DC_SUSP)) 986 conn_pr_state_change(mdev->tconn, os, ns, (flags & ~CS_DC_MASK) | CS_DC_SUSP); 987 988 /* if we are going -> D_FAILED or D_DISKLESS, grab one extra reference 989 * on the ldev here, to be sure the transition -> D_DISKLESS resp. 990 * drbd_ldev_destroy() won't happen before our corresponding 991 * after_state_ch works run, where we put_ldev again. */ 992 if ((os.disk != D_FAILED && ns.disk == D_FAILED) || 993 (os.disk != D_DISKLESS && ns.disk == D_DISKLESS)) 994 atomic_inc(&mdev->local_cnt); 995 996 did_remote = drbd_should_do_remote(mdev->state); 997 mdev->state.i = ns.i; 998 should_do_remote = drbd_should_do_remote(mdev->state); 999 mdev->tconn->susp = ns.susp; 1000 mdev->tconn->susp_nod = ns.susp_nod; 1001 mdev->tconn->susp_fen = ns.susp_fen; 1002 1003 /* put replicated vs not-replicated requests in seperate epochs */ 1004 if (did_remote != should_do_remote) 1005 start_new_tl_epoch(mdev->tconn); 1006 1007 if (os.disk == D_ATTACHING && ns.disk >= D_NEGOTIATING) 1008 drbd_print_uuids(mdev, "attached to UUIDs"); 1009 1010 /* Wake up role changes, that were delayed because of connection establishing */ 1011 if (os.conn == C_WF_REPORT_PARAMS && ns.conn != C_WF_REPORT_PARAMS && 1012 no_peer_wf_report_params(mdev->tconn)) 1013 clear_bit(STATE_SENT, &mdev->tconn->flags); 1014 1015 wake_up(&mdev->misc_wait); 1016 wake_up(&mdev->state_wait); 1017 wake_up(&mdev->tconn->ping_wait); 1018 1019 /* Aborted verify run, or we reached the stop sector. 1020 * Log the last position, unless end-of-device. */ 1021 if ((os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) && 1022 ns.conn <= C_CONNECTED) { 1023 mdev->ov_start_sector = 1024 BM_BIT_TO_SECT(drbd_bm_bits(mdev) - mdev->ov_left); 1025 if (mdev->ov_left) 1026 dev_info(DEV, "Online Verify reached sector %llu\n", 1027 (unsigned long long)mdev->ov_start_sector); 1028 } 1029 1030 if ((os.conn == C_PAUSED_SYNC_T || os.conn == C_PAUSED_SYNC_S) && 1031 (ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE)) { 1032 dev_info(DEV, "Syncer continues.\n"); 1033 mdev->rs_paused += (long)jiffies 1034 -(long)mdev->rs_mark_time[mdev->rs_last_mark]; 1035 if (ns.conn == C_SYNC_TARGET) 1036 mod_timer(&mdev->resync_timer, jiffies); 1037 } 1038 1039 if ((os.conn == C_SYNC_TARGET || os.conn == C_SYNC_SOURCE) && 1040 (ns.conn == C_PAUSED_SYNC_T || ns.conn == C_PAUSED_SYNC_S)) { 1041 dev_info(DEV, "Resync suspended\n"); 1042 mdev->rs_mark_time[mdev->rs_last_mark] = jiffies; 1043 } 1044 1045 if (os.conn == C_CONNECTED && 1046 (ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T)) { 1047 unsigned long now = jiffies; 1048 int i; 1049 1050 set_ov_position(mdev, ns.conn); 1051 mdev->rs_start = now; 1052 mdev->rs_last_events = 0; 1053 mdev->rs_last_sect_ev = 0; 1054 mdev->ov_last_oos_size = 0; 1055 mdev->ov_last_oos_start = 0; 1056 1057 for (i = 0; i < DRBD_SYNC_MARKS; i++) { 1058 mdev->rs_mark_left[i] = mdev->ov_left; 1059 mdev->rs_mark_time[i] = now; 1060 } 1061 1062 drbd_rs_controller_reset(mdev); 1063 1064 if (ns.conn == C_VERIFY_S) { 1065 dev_info(DEV, "Starting Online Verify from sector %llu\n", 1066 (unsigned long long)mdev->ov_position); 1067 mod_timer(&mdev->resync_timer, jiffies); 1068 } 1069 } 1070 1071 if (get_ldev(mdev)) { 1072 u32 mdf = mdev->ldev->md.flags & ~(MDF_CONSISTENT|MDF_PRIMARY_IND| 1073 MDF_CONNECTED_IND|MDF_WAS_UP_TO_DATE| 1074 MDF_PEER_OUT_DATED|MDF_CRASHED_PRIMARY); 1075 1076 mdf &= ~MDF_AL_CLEAN; 1077 if (test_bit(CRASHED_PRIMARY, &mdev->flags)) 1078 mdf |= MDF_CRASHED_PRIMARY; 1079 if (mdev->state.role == R_PRIMARY || 1080 (mdev->state.pdsk < D_INCONSISTENT && mdev->state.peer == R_PRIMARY)) 1081 mdf |= MDF_PRIMARY_IND; 1082 if (mdev->state.conn > C_WF_REPORT_PARAMS) 1083 mdf |= MDF_CONNECTED_IND; 1084 if (mdev->state.disk > D_INCONSISTENT) 1085 mdf |= MDF_CONSISTENT; 1086 if (mdev->state.disk > D_OUTDATED) 1087 mdf |= MDF_WAS_UP_TO_DATE; 1088 if (mdev->state.pdsk <= D_OUTDATED && mdev->state.pdsk >= D_INCONSISTENT) 1089 mdf |= MDF_PEER_OUT_DATED; 1090 if (mdf != mdev->ldev->md.flags) { 1091 mdev->ldev->md.flags = mdf; 1092 drbd_md_mark_dirty(mdev); 1093 } 1094 if (os.disk < D_CONSISTENT && ns.disk >= D_CONSISTENT) 1095 drbd_set_ed_uuid(mdev, mdev->ldev->md.uuid[UI_CURRENT]); 1096 put_ldev(mdev); 1097 } 1098 1099 /* Peer was forced D_UP_TO_DATE & R_PRIMARY, consider to resync */ 1100 if (os.disk == D_INCONSISTENT && os.pdsk == D_INCONSISTENT && 1101 os.peer == R_SECONDARY && ns.peer == R_PRIMARY) 1102 set_bit(CONSIDER_RESYNC, &mdev->flags); 1103 1104 /* Receiver should clean up itself */ 1105 if (os.conn != C_DISCONNECTING && ns.conn == C_DISCONNECTING) 1106 drbd_thread_stop_nowait(&mdev->tconn->receiver); 1107 1108 /* Now the receiver finished cleaning up itself, it should die */ 1109 if (os.conn != C_STANDALONE && ns.conn == C_STANDALONE) 1110 drbd_thread_stop_nowait(&mdev->tconn->receiver); 1111 1112 /* Upon network failure, we need to restart the receiver. */ 1113 if (os.conn > C_WF_CONNECTION && 1114 ns.conn <= C_TEAR_DOWN && ns.conn >= C_TIMEOUT) 1115 drbd_thread_restart_nowait(&mdev->tconn->receiver); 1116 1117 /* Resume AL writing if we get a connection */ 1118 if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) { 1119 drbd_resume_al(mdev); 1120 mdev->tconn->connect_cnt++; 1121 } 1122 1123 /* remember last attach time so request_timer_fn() won't 1124 * kill newly established sessions while we are still trying to thaw 1125 * previously frozen IO */ 1126 if ((os.disk == D_ATTACHING || os.disk == D_NEGOTIATING) && 1127 ns.disk > D_NEGOTIATING) 1128 mdev->last_reattach_jif = jiffies; 1129 1130 ascw = kmalloc(sizeof(*ascw), GFP_ATOMIC); 1131 if (ascw) { 1132 ascw->os = os; 1133 ascw->ns = ns; 1134 ascw->flags = flags; 1135 ascw->w.cb = w_after_state_ch; 1136 ascw->w.mdev = mdev; 1137 ascw->done = done; 1138 drbd_queue_work(&mdev->tconn->sender_work, &ascw->w); 1139 } else { 1140 dev_err(DEV, "Could not kmalloc an ascw\n"); 1141 } 1142 1143 return rv; 1144 } 1145 1146 static int w_after_state_ch(struct drbd_work *w, int unused) 1147 { 1148 struct after_state_chg_work *ascw = 1149 container_of(w, struct after_state_chg_work, w); 1150 struct drbd_conf *mdev = w->mdev; 1151 1152 after_state_ch(mdev, ascw->os, ascw->ns, ascw->flags); 1153 if (ascw->flags & CS_WAIT_COMPLETE) { 1154 D_ASSERT(ascw->done != NULL); 1155 complete(ascw->done); 1156 } 1157 kfree(ascw); 1158 1159 return 0; 1160 } 1161 1162 static void abw_start_sync(struct drbd_conf *mdev, int rv) 1163 { 1164 if (rv) { 1165 dev_err(DEV, "Writing the bitmap failed not starting resync.\n"); 1166 _drbd_request_state(mdev, NS(conn, C_CONNECTED), CS_VERBOSE); 1167 return; 1168 } 1169 1170 switch (mdev->state.conn) { 1171 case C_STARTING_SYNC_T: 1172 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); 1173 break; 1174 case C_STARTING_SYNC_S: 1175 drbd_start_resync(mdev, C_SYNC_SOURCE); 1176 break; 1177 } 1178 } 1179 1180 int drbd_bitmap_io_from_worker(struct drbd_conf *mdev, 1181 int (*io_fn)(struct drbd_conf *), 1182 char *why, enum bm_flag flags) 1183 { 1184 int rv; 1185 1186 D_ASSERT(current == mdev->tconn->worker.task); 1187 1188 /* open coded non-blocking drbd_suspend_io(mdev); */ 1189 set_bit(SUSPEND_IO, &mdev->flags); 1190 1191 drbd_bm_lock(mdev, why, flags); 1192 rv = io_fn(mdev); 1193 drbd_bm_unlock(mdev); 1194 1195 drbd_resume_io(mdev); 1196 1197 return rv; 1198 } 1199 1200 /** 1201 * after_state_ch() - Perform after state change actions that may sleep 1202 * @mdev: DRBD device. 1203 * @os: old state. 1204 * @ns: new state. 1205 * @flags: Flags 1206 */ 1207 static void after_state_ch(struct drbd_conf *mdev, union drbd_state os, 1208 union drbd_state ns, enum chg_state_flags flags) 1209 { 1210 struct sib_info sib; 1211 1212 sib.sib_reason = SIB_STATE_CHANGE; 1213 sib.os = os; 1214 sib.ns = ns; 1215 1216 if (os.conn != C_CONNECTED && ns.conn == C_CONNECTED) { 1217 clear_bit(CRASHED_PRIMARY, &mdev->flags); 1218 if (mdev->p_uuid) 1219 mdev->p_uuid[UI_FLAGS] &= ~((u64)2); 1220 } 1221 1222 /* Inform userspace about the change... */ 1223 drbd_bcast_event(mdev, &sib); 1224 1225 if (!(os.role == R_PRIMARY && os.disk < D_UP_TO_DATE && os.pdsk < D_UP_TO_DATE) && 1226 (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE)) 1227 drbd_khelper(mdev, "pri-on-incon-degr"); 1228 1229 /* Here we have the actions that are performed after a 1230 state change. This function might sleep */ 1231 1232 if (ns.susp_nod) { 1233 struct drbd_tconn *tconn = mdev->tconn; 1234 enum drbd_req_event what = NOTHING; 1235 1236 spin_lock_irq(&tconn->req_lock); 1237 if (os.conn < C_CONNECTED && conn_lowest_conn(tconn) >= C_CONNECTED) 1238 what = RESEND; 1239 1240 if ((os.disk == D_ATTACHING || os.disk == D_NEGOTIATING) && 1241 conn_lowest_disk(tconn) > D_NEGOTIATING) 1242 what = RESTART_FROZEN_DISK_IO; 1243 1244 if (tconn->susp_nod && what != NOTHING) { 1245 _tl_restart(tconn, what); 1246 _conn_request_state(tconn, 1247 (union drbd_state) { { .susp_nod = 1 } }, 1248 (union drbd_state) { { .susp_nod = 0 } }, 1249 CS_VERBOSE); 1250 } 1251 spin_unlock_irq(&tconn->req_lock); 1252 } 1253 1254 if (ns.susp_fen) { 1255 struct drbd_tconn *tconn = mdev->tconn; 1256 1257 spin_lock_irq(&tconn->req_lock); 1258 if (tconn->susp_fen && conn_lowest_conn(tconn) >= C_CONNECTED) { 1259 /* case2: The connection was established again: */ 1260 struct drbd_conf *odev; 1261 int vnr; 1262 1263 rcu_read_lock(); 1264 idr_for_each_entry(&tconn->volumes, odev, vnr) 1265 clear_bit(NEW_CUR_UUID, &odev->flags); 1266 rcu_read_unlock(); 1267 _tl_restart(tconn, RESEND); 1268 _conn_request_state(tconn, 1269 (union drbd_state) { { .susp_fen = 1 } }, 1270 (union drbd_state) { { .susp_fen = 0 } }, 1271 CS_VERBOSE); 1272 } 1273 spin_unlock_irq(&tconn->req_lock); 1274 } 1275 1276 /* Became sync source. With protocol >= 96, we still need to send out 1277 * the sync uuid now. Need to do that before any drbd_send_state, or 1278 * the other side may go "paused sync" before receiving the sync uuids, 1279 * which is unexpected. */ 1280 if ((os.conn != C_SYNC_SOURCE && os.conn != C_PAUSED_SYNC_S) && 1281 (ns.conn == C_SYNC_SOURCE || ns.conn == C_PAUSED_SYNC_S) && 1282 mdev->tconn->agreed_pro_version >= 96 && get_ldev(mdev)) { 1283 drbd_gen_and_send_sync_uuid(mdev); 1284 put_ldev(mdev); 1285 } 1286 1287 /* Do not change the order of the if above and the two below... */ 1288 if (os.pdsk == D_DISKLESS && 1289 ns.pdsk > D_DISKLESS && ns.pdsk != D_UNKNOWN) { /* attach on the peer */ 1290 /* we probably will start a resync soon. 1291 * make sure those things are properly reset. */ 1292 mdev->rs_total = 0; 1293 mdev->rs_failed = 0; 1294 atomic_set(&mdev->rs_pending_cnt, 0); 1295 drbd_rs_cancel_all(mdev); 1296 1297 drbd_send_uuids(mdev); 1298 drbd_send_state(mdev, ns); 1299 } 1300 /* No point in queuing send_bitmap if we don't have a connection 1301 * anymore, so check also the _current_ state, not only the new state 1302 * at the time this work was queued. */ 1303 if (os.conn != C_WF_BITMAP_S && ns.conn == C_WF_BITMAP_S && 1304 mdev->state.conn == C_WF_BITMAP_S) 1305 drbd_queue_bitmap_io(mdev, &drbd_send_bitmap, NULL, 1306 "send_bitmap (WFBitMapS)", 1307 BM_LOCKED_TEST_ALLOWED); 1308 1309 /* Lost contact to peer's copy of the data */ 1310 if ((os.pdsk >= D_INCONSISTENT && 1311 os.pdsk != D_UNKNOWN && 1312 os.pdsk != D_OUTDATED) 1313 && (ns.pdsk < D_INCONSISTENT || 1314 ns.pdsk == D_UNKNOWN || 1315 ns.pdsk == D_OUTDATED)) { 1316 if (get_ldev(mdev)) { 1317 if ((ns.role == R_PRIMARY || ns.peer == R_PRIMARY) && 1318 mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE) { 1319 if (drbd_suspended(mdev)) { 1320 set_bit(NEW_CUR_UUID, &mdev->flags); 1321 } else { 1322 drbd_uuid_new_current(mdev); 1323 drbd_send_uuids(mdev); 1324 } 1325 } 1326 put_ldev(mdev); 1327 } 1328 } 1329 1330 if (ns.pdsk < D_INCONSISTENT && get_ldev(mdev)) { 1331 if (os.peer == R_SECONDARY && ns.peer == R_PRIMARY && 1332 mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE) { 1333 drbd_uuid_new_current(mdev); 1334 drbd_send_uuids(mdev); 1335 } 1336 /* D_DISKLESS Peer becomes secondary */ 1337 if (os.peer == R_PRIMARY && ns.peer == R_SECONDARY) 1338 /* We may still be Primary ourselves. 1339 * No harm done if the bitmap still changes, 1340 * redirtied pages will follow later. */ 1341 drbd_bitmap_io_from_worker(mdev, &drbd_bm_write, 1342 "demote diskless peer", BM_LOCKED_SET_ALLOWED); 1343 put_ldev(mdev); 1344 } 1345 1346 /* Write out all changed bits on demote. 1347 * Though, no need to da that just yet 1348 * if there is a resync going on still */ 1349 if (os.role == R_PRIMARY && ns.role == R_SECONDARY && 1350 mdev->state.conn <= C_CONNECTED && get_ldev(mdev)) { 1351 /* No changes to the bitmap expected this time, so assert that, 1352 * even though no harm was done if it did change. */ 1353 drbd_bitmap_io_from_worker(mdev, &drbd_bm_write, 1354 "demote", BM_LOCKED_TEST_ALLOWED); 1355 put_ldev(mdev); 1356 } 1357 1358 /* Last part of the attaching process ... */ 1359 if (ns.conn >= C_CONNECTED && 1360 os.disk == D_ATTACHING && ns.disk == D_NEGOTIATING) { 1361 drbd_send_sizes(mdev, 0, 0); /* to start sync... */ 1362 drbd_send_uuids(mdev); 1363 drbd_send_state(mdev, ns); 1364 } 1365 1366 /* We want to pause/continue resync, tell peer. */ 1367 if (ns.conn >= C_CONNECTED && 1368 ((os.aftr_isp != ns.aftr_isp) || 1369 (os.user_isp != ns.user_isp))) 1370 drbd_send_state(mdev, ns); 1371 1372 /* In case one of the isp bits got set, suspend other devices. */ 1373 if ((!os.aftr_isp && !os.peer_isp && !os.user_isp) && 1374 (ns.aftr_isp || ns.peer_isp || ns.user_isp)) 1375 suspend_other_sg(mdev); 1376 1377 /* Make sure the peer gets informed about eventual state 1378 changes (ISP bits) while we were in WFReportParams. */ 1379 if (os.conn == C_WF_REPORT_PARAMS && ns.conn >= C_CONNECTED) 1380 drbd_send_state(mdev, ns); 1381 1382 if (os.conn != C_AHEAD && ns.conn == C_AHEAD) 1383 drbd_send_state(mdev, ns); 1384 1385 /* We are in the progress to start a full sync... */ 1386 if ((os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) || 1387 (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S)) 1388 /* no other bitmap changes expected during this phase */ 1389 drbd_queue_bitmap_io(mdev, 1390 &drbd_bmio_set_n_write, &abw_start_sync, 1391 "set_n_write from StartingSync", BM_LOCKED_TEST_ALLOWED); 1392 1393 /* first half of local IO error, failure to attach, 1394 * or administrative detach */ 1395 if (os.disk != D_FAILED && ns.disk == D_FAILED) { 1396 enum drbd_io_error_p eh = EP_PASS_ON; 1397 int was_io_error = 0; 1398 /* corresponding get_ldev was in __drbd_set_state, to serialize 1399 * our cleanup here with the transition to D_DISKLESS. 1400 * But is is still not save to dreference ldev here, since 1401 * we might come from an failed Attach before ldev was set. */ 1402 if (mdev->ldev) { 1403 rcu_read_lock(); 1404 eh = rcu_dereference(mdev->ldev->disk_conf)->on_io_error; 1405 rcu_read_unlock(); 1406 1407 was_io_error = test_and_clear_bit(WAS_IO_ERROR, &mdev->flags); 1408 1409 if (was_io_error && eh == EP_CALL_HELPER) 1410 drbd_khelper(mdev, "local-io-error"); 1411 1412 /* Immediately allow completion of all application IO, 1413 * that waits for completion from the local disk, 1414 * if this was a force-detach due to disk_timeout 1415 * or administrator request (drbdsetup detach --force). 1416 * Do NOT abort otherwise. 1417 * Aborting local requests may cause serious problems, 1418 * if requests are completed to upper layers already, 1419 * and then later the already submitted local bio completes. 1420 * This can cause DMA into former bio pages that meanwhile 1421 * have been re-used for other things. 1422 * So aborting local requests may cause crashes, 1423 * or even worse, silent data corruption. 1424 */ 1425 if (test_and_clear_bit(FORCE_DETACH, &mdev->flags)) 1426 tl_abort_disk_io(mdev); 1427 1428 /* current state still has to be D_FAILED, 1429 * there is only one way out: to D_DISKLESS, 1430 * and that may only happen after our put_ldev below. */ 1431 if (mdev->state.disk != D_FAILED) 1432 dev_err(DEV, 1433 "ASSERT FAILED: disk is %s during detach\n", 1434 drbd_disk_str(mdev->state.disk)); 1435 1436 if (ns.conn >= C_CONNECTED) 1437 drbd_send_state(mdev, ns); 1438 1439 drbd_rs_cancel_all(mdev); 1440 1441 /* In case we want to get something to stable storage still, 1442 * this may be the last chance. 1443 * Following put_ldev may transition to D_DISKLESS. */ 1444 drbd_md_sync(mdev); 1445 } 1446 put_ldev(mdev); 1447 } 1448 1449 /* second half of local IO error, failure to attach, 1450 * or administrative detach, 1451 * after local_cnt references have reached zero again */ 1452 if (os.disk != D_DISKLESS && ns.disk == D_DISKLESS) { 1453 /* We must still be diskless, 1454 * re-attach has to be serialized with this! */ 1455 if (mdev->state.disk != D_DISKLESS) 1456 dev_err(DEV, 1457 "ASSERT FAILED: disk is %s while going diskless\n", 1458 drbd_disk_str(mdev->state.disk)); 1459 1460 if (ns.conn >= C_CONNECTED) 1461 drbd_send_state(mdev, ns); 1462 /* corresponding get_ldev in __drbd_set_state 1463 * this may finally trigger drbd_ldev_destroy. */ 1464 put_ldev(mdev); 1465 } 1466 1467 /* Notify peer that I had a local IO error, and did not detached.. */ 1468 if (os.disk == D_UP_TO_DATE && ns.disk == D_INCONSISTENT && ns.conn >= C_CONNECTED) 1469 drbd_send_state(mdev, ns); 1470 1471 /* Disks got bigger while they were detached */ 1472 if (ns.disk > D_NEGOTIATING && ns.pdsk > D_NEGOTIATING && 1473 test_and_clear_bit(RESYNC_AFTER_NEG, &mdev->flags)) { 1474 if (ns.conn == C_CONNECTED) 1475 resync_after_online_grow(mdev); 1476 } 1477 1478 /* A resync finished or aborted, wake paused devices... */ 1479 if ((os.conn > C_CONNECTED && ns.conn <= C_CONNECTED) || 1480 (os.peer_isp && !ns.peer_isp) || 1481 (os.user_isp && !ns.user_isp)) 1482 resume_next_sg(mdev); 1483 1484 /* sync target done with resync. Explicitly notify peer, even though 1485 * it should (at least for non-empty resyncs) already know itself. */ 1486 if (os.disk < D_UP_TO_DATE && os.conn >= C_SYNC_SOURCE && ns.conn == C_CONNECTED) 1487 drbd_send_state(mdev, ns); 1488 1489 /* Verify finished, or reached stop sector. Peer did not know about 1490 * the stop sector, and we may even have changed the stop sector during 1491 * verify to interrupt/stop early. Send the new state. */ 1492 if (os.conn == C_VERIFY_S && ns.conn == C_CONNECTED 1493 && verify_can_do_stop_sector(mdev)) 1494 drbd_send_state(mdev, ns); 1495 1496 /* This triggers bitmap writeout of potentially still unwritten pages 1497 * if the resync finished cleanly, or aborted because of peer disk 1498 * failure, or because of connection loss. 1499 * For resync aborted because of local disk failure, we cannot do 1500 * any bitmap writeout anymore. 1501 * No harm done if some bits change during this phase. 1502 */ 1503 if (os.conn > C_CONNECTED && ns.conn <= C_CONNECTED && get_ldev(mdev)) { 1504 drbd_queue_bitmap_io(mdev, &drbd_bm_write_copy_pages, NULL, 1505 "write from resync_finished", BM_LOCKED_CHANGE_ALLOWED); 1506 put_ldev(mdev); 1507 } 1508 1509 if (ns.disk == D_DISKLESS && 1510 ns.conn == C_STANDALONE && 1511 ns.role == R_SECONDARY) { 1512 if (os.aftr_isp != ns.aftr_isp) 1513 resume_next_sg(mdev); 1514 } 1515 1516 drbd_md_sync(mdev); 1517 } 1518 1519 struct after_conn_state_chg_work { 1520 struct drbd_work w; 1521 enum drbd_conns oc; 1522 union drbd_state ns_min; 1523 union drbd_state ns_max; /* new, max state, over all mdevs */ 1524 enum chg_state_flags flags; 1525 }; 1526 1527 static int w_after_conn_state_ch(struct drbd_work *w, int unused) 1528 { 1529 struct after_conn_state_chg_work *acscw = 1530 container_of(w, struct after_conn_state_chg_work, w); 1531 struct drbd_tconn *tconn = w->tconn; 1532 enum drbd_conns oc = acscw->oc; 1533 union drbd_state ns_max = acscw->ns_max; 1534 struct drbd_conf *mdev; 1535 int vnr; 1536 1537 kfree(acscw); 1538 1539 /* Upon network configuration, we need to start the receiver */ 1540 if (oc == C_STANDALONE && ns_max.conn == C_UNCONNECTED) 1541 drbd_thread_start(&tconn->receiver); 1542 1543 if (oc == C_DISCONNECTING && ns_max.conn == C_STANDALONE) { 1544 struct net_conf *old_conf; 1545 1546 mutex_lock(&tconn->conf_update); 1547 old_conf = tconn->net_conf; 1548 tconn->my_addr_len = 0; 1549 tconn->peer_addr_len = 0; 1550 rcu_assign_pointer(tconn->net_conf, NULL); 1551 conn_free_crypto(tconn); 1552 mutex_unlock(&tconn->conf_update); 1553 1554 synchronize_rcu(); 1555 kfree(old_conf); 1556 } 1557 1558 if (ns_max.susp_fen) { 1559 /* case1: The outdate peer handler is successful: */ 1560 if (ns_max.pdsk <= D_OUTDATED) { 1561 rcu_read_lock(); 1562 idr_for_each_entry(&tconn->volumes, mdev, vnr) { 1563 if (test_bit(NEW_CUR_UUID, &mdev->flags)) { 1564 drbd_uuid_new_current(mdev); 1565 clear_bit(NEW_CUR_UUID, &mdev->flags); 1566 } 1567 } 1568 rcu_read_unlock(); 1569 spin_lock_irq(&tconn->req_lock); 1570 _tl_restart(tconn, CONNECTION_LOST_WHILE_PENDING); 1571 _conn_request_state(tconn, 1572 (union drbd_state) { { .susp_fen = 1 } }, 1573 (union drbd_state) { { .susp_fen = 0 } }, 1574 CS_VERBOSE); 1575 spin_unlock_irq(&tconn->req_lock); 1576 } 1577 } 1578 kref_put(&tconn->kref, &conn_destroy); 1579 1580 conn_md_sync(tconn); 1581 1582 return 0; 1583 } 1584 1585 void conn_old_common_state(struct drbd_tconn *tconn, union drbd_state *pcs, enum chg_state_flags *pf) 1586 { 1587 enum chg_state_flags flags = ~0; 1588 struct drbd_conf *mdev; 1589 int vnr, first_vol = 1; 1590 union drbd_dev_state os, cs = { 1591 { .role = R_SECONDARY, 1592 .peer = R_UNKNOWN, 1593 .conn = tconn->cstate, 1594 .disk = D_DISKLESS, 1595 .pdsk = D_UNKNOWN, 1596 } }; 1597 1598 rcu_read_lock(); 1599 idr_for_each_entry(&tconn->volumes, mdev, vnr) { 1600 os = mdev->state; 1601 1602 if (first_vol) { 1603 cs = os; 1604 first_vol = 0; 1605 continue; 1606 } 1607 1608 if (cs.role != os.role) 1609 flags &= ~CS_DC_ROLE; 1610 1611 if (cs.peer != os.peer) 1612 flags &= ~CS_DC_PEER; 1613 1614 if (cs.conn != os.conn) 1615 flags &= ~CS_DC_CONN; 1616 1617 if (cs.disk != os.disk) 1618 flags &= ~CS_DC_DISK; 1619 1620 if (cs.pdsk != os.pdsk) 1621 flags &= ~CS_DC_PDSK; 1622 } 1623 rcu_read_unlock(); 1624 1625 *pf |= CS_DC_MASK; 1626 *pf &= flags; 1627 (*pcs).i = cs.i; 1628 } 1629 1630 static enum drbd_state_rv 1631 conn_is_valid_transition(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val, 1632 enum chg_state_flags flags) 1633 { 1634 enum drbd_state_rv rv = SS_SUCCESS; 1635 union drbd_state ns, os; 1636 struct drbd_conf *mdev; 1637 int vnr; 1638 1639 rcu_read_lock(); 1640 idr_for_each_entry(&tconn->volumes, mdev, vnr) { 1641 os = drbd_read_state(mdev); 1642 ns = sanitize_state(mdev, apply_mask_val(os, mask, val), NULL); 1643 1644 if (flags & CS_IGN_OUTD_FAIL && ns.disk == D_OUTDATED && os.disk < D_OUTDATED) 1645 ns.disk = os.disk; 1646 1647 if (ns.i == os.i) 1648 continue; 1649 1650 rv = is_valid_transition(os, ns); 1651 if (rv < SS_SUCCESS) 1652 break; 1653 1654 if (!(flags & CS_HARD)) { 1655 rv = is_valid_state(mdev, ns); 1656 if (rv < SS_SUCCESS) { 1657 if (is_valid_state(mdev, os) == rv) 1658 rv = is_valid_soft_transition(os, ns, tconn); 1659 } else 1660 rv = is_valid_soft_transition(os, ns, tconn); 1661 } 1662 if (rv < SS_SUCCESS) 1663 break; 1664 } 1665 rcu_read_unlock(); 1666 1667 if (rv < SS_SUCCESS && flags & CS_VERBOSE) 1668 print_st_err(mdev, os, ns, rv); 1669 1670 return rv; 1671 } 1672 1673 void 1674 conn_set_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val, 1675 union drbd_state *pns_min, union drbd_state *pns_max, enum chg_state_flags flags) 1676 { 1677 union drbd_state ns, os, ns_max = { }; 1678 union drbd_state ns_min = { 1679 { .role = R_MASK, 1680 .peer = R_MASK, 1681 .conn = val.conn, 1682 .disk = D_MASK, 1683 .pdsk = D_MASK 1684 } }; 1685 struct drbd_conf *mdev; 1686 enum drbd_state_rv rv; 1687 int vnr, number_of_volumes = 0; 1688 1689 if (mask.conn == C_MASK) { 1690 /* remember last connect time so request_timer_fn() won't 1691 * kill newly established sessions while we are still trying to thaw 1692 * previously frozen IO */ 1693 if (tconn->cstate != C_WF_REPORT_PARAMS && val.conn == C_WF_REPORT_PARAMS) 1694 tconn->last_reconnect_jif = jiffies; 1695 1696 tconn->cstate = val.conn; 1697 } 1698 1699 rcu_read_lock(); 1700 idr_for_each_entry(&tconn->volumes, mdev, vnr) { 1701 number_of_volumes++; 1702 os = drbd_read_state(mdev); 1703 ns = apply_mask_val(os, mask, val); 1704 ns = sanitize_state(mdev, ns, NULL); 1705 1706 if (flags & CS_IGN_OUTD_FAIL && ns.disk == D_OUTDATED && os.disk < D_OUTDATED) 1707 ns.disk = os.disk; 1708 1709 rv = __drbd_set_state(mdev, ns, flags, NULL); 1710 if (rv < SS_SUCCESS) 1711 BUG(); 1712 1713 ns.i = mdev->state.i; 1714 ns_max.role = max_role(ns.role, ns_max.role); 1715 ns_max.peer = max_role(ns.peer, ns_max.peer); 1716 ns_max.conn = max_t(enum drbd_conns, ns.conn, ns_max.conn); 1717 ns_max.disk = max_t(enum drbd_disk_state, ns.disk, ns_max.disk); 1718 ns_max.pdsk = max_t(enum drbd_disk_state, ns.pdsk, ns_max.pdsk); 1719 1720 ns_min.role = min_role(ns.role, ns_min.role); 1721 ns_min.peer = min_role(ns.peer, ns_min.peer); 1722 ns_min.conn = min_t(enum drbd_conns, ns.conn, ns_min.conn); 1723 ns_min.disk = min_t(enum drbd_disk_state, ns.disk, ns_min.disk); 1724 ns_min.pdsk = min_t(enum drbd_disk_state, ns.pdsk, ns_min.pdsk); 1725 } 1726 rcu_read_unlock(); 1727 1728 if (number_of_volumes == 0) { 1729 ns_min = ns_max = (union drbd_state) { { 1730 .role = R_SECONDARY, 1731 .peer = R_UNKNOWN, 1732 .conn = val.conn, 1733 .disk = D_DISKLESS, 1734 .pdsk = D_UNKNOWN 1735 } }; 1736 } 1737 1738 ns_min.susp = ns_max.susp = tconn->susp; 1739 ns_min.susp_nod = ns_max.susp_nod = tconn->susp_nod; 1740 ns_min.susp_fen = ns_max.susp_fen = tconn->susp_fen; 1741 1742 *pns_min = ns_min; 1743 *pns_max = ns_max; 1744 } 1745 1746 static enum drbd_state_rv 1747 _conn_rq_cond(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val) 1748 { 1749 enum drbd_state_rv rv; 1750 1751 if (test_and_clear_bit(CONN_WD_ST_CHG_OKAY, &tconn->flags)) 1752 return SS_CW_SUCCESS; 1753 1754 if (test_and_clear_bit(CONN_WD_ST_CHG_FAIL, &tconn->flags)) 1755 return SS_CW_FAILED_BY_PEER; 1756 1757 rv = conn_is_valid_transition(tconn, mask, val, 0); 1758 if (rv == SS_SUCCESS && tconn->cstate == C_WF_REPORT_PARAMS) 1759 rv = SS_UNKNOWN_ERROR; /* continue waiting */ 1760 1761 return rv; 1762 } 1763 1764 enum drbd_state_rv 1765 _conn_request_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val, 1766 enum chg_state_flags flags) 1767 { 1768 enum drbd_state_rv rv = SS_SUCCESS; 1769 struct after_conn_state_chg_work *acscw; 1770 enum drbd_conns oc = tconn->cstate; 1771 union drbd_state ns_max, ns_min, os; 1772 bool have_mutex = false; 1773 1774 if (mask.conn) { 1775 rv = is_valid_conn_transition(oc, val.conn); 1776 if (rv < SS_SUCCESS) 1777 goto abort; 1778 } 1779 1780 rv = conn_is_valid_transition(tconn, mask, val, flags); 1781 if (rv < SS_SUCCESS) 1782 goto abort; 1783 1784 if (oc == C_WF_REPORT_PARAMS && val.conn == C_DISCONNECTING && 1785 !(flags & (CS_LOCAL_ONLY | CS_HARD))) { 1786 1787 /* This will be a cluster-wide state change. 1788 * Need to give up the spinlock, grab the mutex, 1789 * then send the state change request, ... */ 1790 spin_unlock_irq(&tconn->req_lock); 1791 mutex_lock(&tconn->cstate_mutex); 1792 have_mutex = true; 1793 1794 set_bit(CONN_WD_ST_CHG_REQ, &tconn->flags); 1795 if (conn_send_state_req(tconn, mask, val)) { 1796 /* sending failed. */ 1797 clear_bit(CONN_WD_ST_CHG_REQ, &tconn->flags); 1798 rv = SS_CW_FAILED_BY_PEER; 1799 /* need to re-aquire the spin lock, though */ 1800 goto abort_unlocked; 1801 } 1802 1803 if (val.conn == C_DISCONNECTING) 1804 set_bit(DISCONNECT_SENT, &tconn->flags); 1805 1806 /* ... and re-aquire the spinlock. 1807 * If _conn_rq_cond() returned >= SS_SUCCESS, we must call 1808 * conn_set_state() within the same spinlock. */ 1809 spin_lock_irq(&tconn->req_lock); 1810 wait_event_lock_irq(tconn->ping_wait, 1811 (rv = _conn_rq_cond(tconn, mask, val)), 1812 tconn->req_lock); 1813 clear_bit(CONN_WD_ST_CHG_REQ, &tconn->flags); 1814 if (rv < SS_SUCCESS) 1815 goto abort; 1816 } 1817 1818 conn_old_common_state(tconn, &os, &flags); 1819 flags |= CS_DC_SUSP; 1820 conn_set_state(tconn, mask, val, &ns_min, &ns_max, flags); 1821 conn_pr_state_change(tconn, os, ns_max, flags); 1822 1823 acscw = kmalloc(sizeof(*acscw), GFP_ATOMIC); 1824 if (acscw) { 1825 acscw->oc = os.conn; 1826 acscw->ns_min = ns_min; 1827 acscw->ns_max = ns_max; 1828 acscw->flags = flags; 1829 acscw->w.cb = w_after_conn_state_ch; 1830 kref_get(&tconn->kref); 1831 acscw->w.tconn = tconn; 1832 drbd_queue_work(&tconn->sender_work, &acscw->w); 1833 } else { 1834 conn_err(tconn, "Could not kmalloc an acscw\n"); 1835 } 1836 1837 abort: 1838 if (have_mutex) { 1839 /* mutex_unlock() "... must not be used in interrupt context.", 1840 * so give up the spinlock, then re-aquire it */ 1841 spin_unlock_irq(&tconn->req_lock); 1842 abort_unlocked: 1843 mutex_unlock(&tconn->cstate_mutex); 1844 spin_lock_irq(&tconn->req_lock); 1845 } 1846 if (rv < SS_SUCCESS && flags & CS_VERBOSE) { 1847 conn_err(tconn, "State change failed: %s\n", drbd_set_st_err_str(rv)); 1848 conn_err(tconn, " mask = 0x%x val = 0x%x\n", mask.i, val.i); 1849 conn_err(tconn, " old_conn:%s wanted_conn:%s\n", drbd_conn_str(oc), drbd_conn_str(val.conn)); 1850 } 1851 return rv; 1852 } 1853 1854 enum drbd_state_rv 1855 conn_request_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val, 1856 enum chg_state_flags flags) 1857 { 1858 enum drbd_state_rv rv; 1859 1860 spin_lock_irq(&tconn->req_lock); 1861 rv = _conn_request_state(tconn, mask, val, flags); 1862 spin_unlock_irq(&tconn->req_lock); 1863 1864 return rv; 1865 } 1866