1 /* -*- mode: c; c-basic-offset: 8; -*- 2 * vim: noexpandtab sw=8 ts=8 sts=0: 3 * 4 * dlmcommon.h 5 * 6 * Copyright (C) 2004 Oracle. All rights reserved. 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public 10 * License as published by the Free Software Foundation; either 11 * version 2 of the License, or (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public 19 * License along with this program; if not, write to the 20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 21 * Boston, MA 021110-1307, USA. 22 * 23 */ 24 25 #ifndef DLMCOMMON_H 26 #define DLMCOMMON_H 27 28 #include <linux/kref.h> 29 30 #define DLM_HB_NODE_DOWN_PRI (0xf000000) 31 #define DLM_HB_NODE_UP_PRI (0x8000000) 32 33 #define DLM_LOCKID_NAME_MAX 32 34 35 #define DLM_DOMAIN_NAME_MAX_LEN 255 36 #define DLM_LOCK_RES_OWNER_UNKNOWN O2NM_MAX_NODES 37 #define DLM_THREAD_SHUFFLE_INTERVAL 5 // flush everything every 5 passes 38 #define DLM_THREAD_MS 200 // flush at least every 200 ms 39 40 #define DLM_HASH_BITS 7 41 #define DLM_HASH_SIZE (1 << DLM_HASH_BITS) 42 #define DLM_HASH_MASK (DLM_HASH_SIZE - 1) 43 44 enum dlm_ast_type { 45 DLM_AST = 0, 46 DLM_BAST, 47 DLM_ASTUNLOCK 48 }; 49 50 51 #define LKM_VALID_FLAGS (LKM_VALBLK | LKM_CONVERT | LKM_UNLOCK | \ 52 LKM_CANCEL | LKM_INVVALBLK | LKM_FORCE | \ 53 LKM_RECOVERY | LKM_LOCAL | LKM_NOQUEUE) 54 55 #define DLM_RECOVERY_LOCK_NAME "$RECOVERY" 56 #define DLM_RECOVERY_LOCK_NAME_LEN 9 57 58 static inline int dlm_is_recovery_lock(const char *lock_name, int name_len) 59 { 60 if (name_len == DLM_RECOVERY_LOCK_NAME_LEN && 61 memcmp(lock_name, DLM_RECOVERY_LOCK_NAME, name_len)==0) 62 return 1; 63 return 0; 64 } 65 66 #define DLM_RECO_STATE_ACTIVE 0x0001 67 68 struct dlm_recovery_ctxt 69 { 70 struct list_head resources; 71 struct list_head received; 72 struct list_head node_data; 73 u8 new_master; 74 u8 dead_node; 75 u16 state; 76 unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; 77 wait_queue_head_t event; 78 }; 79 80 enum dlm_ctxt_state { 81 DLM_CTXT_NEW = 0, 82 DLM_CTXT_JOINED, 83 DLM_CTXT_IN_SHUTDOWN, 84 DLM_CTXT_LEAVING, 85 }; 86 87 struct dlm_ctxt 88 { 89 struct list_head list; 90 struct list_head *resources; 91 struct list_head dirty_list; 92 struct list_head purge_list; 93 struct list_head pending_asts; 94 struct list_head pending_basts; 95 unsigned int purge_count; 96 spinlock_t spinlock; 97 spinlock_t ast_lock; 98 char *name; 99 u8 node_num; 100 u32 key; 101 u8 joining_node; 102 wait_queue_head_t dlm_join_events; 103 unsigned long live_nodes_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; 104 unsigned long domain_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; 105 unsigned long recovery_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; 106 struct dlm_recovery_ctxt reco; 107 spinlock_t master_lock; 108 struct list_head master_list; 109 struct list_head mle_hb_events; 110 111 /* these give a really vague idea of the system load */ 112 atomic_t local_resources; 113 atomic_t remote_resources; 114 atomic_t unknown_resources; 115 116 /* NOTE: Next three are protected by dlm_domain_lock */ 117 struct kref dlm_refs; 118 enum dlm_ctxt_state dlm_state; 119 unsigned int num_joins; 120 121 struct o2hb_callback_func dlm_hb_up; 122 struct o2hb_callback_func dlm_hb_down; 123 struct task_struct *dlm_thread_task; 124 struct task_struct *dlm_reco_thread_task; 125 wait_queue_head_t dlm_thread_wq; 126 wait_queue_head_t dlm_reco_thread_wq; 127 wait_queue_head_t ast_wq; 128 wait_queue_head_t migration_wq; 129 130 struct work_struct dispatched_work; 131 struct list_head work_list; 132 spinlock_t work_lock; 133 struct list_head dlm_domain_handlers; 134 struct list_head dlm_eviction_callbacks; 135 }; 136 137 /* these keventd work queue items are for less-frequently 138 * called functions that cannot be directly called from the 139 * net message handlers for some reason, usually because 140 * they need to send net messages of their own. */ 141 void dlm_dispatch_work(void *data); 142 143 struct dlm_lock_resource; 144 struct dlm_work_item; 145 146 typedef void (dlm_workfunc_t)(struct dlm_work_item *, void *); 147 148 struct dlm_request_all_locks_priv 149 { 150 u8 reco_master; 151 u8 dead_node; 152 }; 153 154 struct dlm_mig_lockres_priv 155 { 156 struct dlm_lock_resource *lockres; 157 u8 real_master; 158 }; 159 160 struct dlm_assert_master_priv 161 { 162 struct dlm_lock_resource *lockres; 163 u8 request_from; 164 u32 flags; 165 unsigned ignore_higher:1; 166 }; 167 168 169 struct dlm_work_item 170 { 171 struct list_head list; 172 dlm_workfunc_t *func; 173 struct dlm_ctxt *dlm; 174 void *data; 175 union { 176 struct dlm_request_all_locks_priv ral; 177 struct dlm_mig_lockres_priv ml; 178 struct dlm_assert_master_priv am; 179 } u; 180 }; 181 182 static inline void dlm_init_work_item(struct dlm_ctxt *dlm, 183 struct dlm_work_item *i, 184 dlm_workfunc_t *f, void *data) 185 { 186 memset(i, 0, sizeof(*i)); 187 i->func = f; 188 INIT_LIST_HEAD(&i->list); 189 i->data = data; 190 i->dlm = dlm; /* must have already done a dlm_grab on this! */ 191 } 192 193 194 195 static inline void __dlm_set_joining_node(struct dlm_ctxt *dlm, 196 u8 node) 197 { 198 assert_spin_locked(&dlm->spinlock); 199 200 dlm->joining_node = node; 201 wake_up(&dlm->dlm_join_events); 202 } 203 204 #define DLM_LOCK_RES_UNINITED 0x00000001 205 #define DLM_LOCK_RES_RECOVERING 0x00000002 206 #define DLM_LOCK_RES_READY 0x00000004 207 #define DLM_LOCK_RES_DIRTY 0x00000008 208 #define DLM_LOCK_RES_IN_PROGRESS 0x00000010 209 #define DLM_LOCK_RES_MIGRATING 0x00000020 210 211 #define DLM_PURGE_INTERVAL_MS (8 * 1000) 212 213 struct dlm_lock_resource 214 { 215 /* WARNING: Please see the comment in dlm_init_lockres before 216 * adding fields here. */ 217 struct list_head list; 218 struct kref refs; 219 220 /* please keep these next 3 in this order 221 * some funcs want to iterate over all lists */ 222 struct list_head granted; 223 struct list_head converting; 224 struct list_head blocked; 225 226 struct list_head dirty; 227 struct list_head recovering; // dlm_recovery_ctxt.resources list 228 229 /* unused lock resources have their last_used stamped and are 230 * put on a list for the dlm thread to run. */ 231 struct list_head purge; 232 unsigned long last_used; 233 234 unsigned migration_pending:1; 235 atomic_t asts_reserved; 236 spinlock_t spinlock; 237 wait_queue_head_t wq; 238 u8 owner; //node which owns the lock resource, or unknown 239 u16 state; 240 struct qstr lockname; 241 char lvb[DLM_LVB_LEN]; 242 }; 243 244 struct dlm_migratable_lock 245 { 246 __be64 cookie; 247 248 /* these 3 are just padding for the in-memory structure, but 249 * list and flags are actually used when sent over the wire */ 250 __be16 pad1; 251 u8 list; // 0=granted, 1=converting, 2=blocked 252 u8 flags; 253 254 s8 type; 255 s8 convert_type; 256 s8 highest_blocked; 257 u8 node; 258 }; // 16 bytes 259 260 struct dlm_lock 261 { 262 struct dlm_migratable_lock ml; 263 264 struct list_head list; 265 struct list_head ast_list; 266 struct list_head bast_list; 267 struct dlm_lock_resource *lockres; 268 spinlock_t spinlock; 269 struct kref lock_refs; 270 271 // ast and bast must be callable while holding a spinlock! 272 dlm_astlockfunc_t *ast; 273 dlm_bastlockfunc_t *bast; 274 void *astdata; 275 struct dlm_lockstatus *lksb; 276 unsigned ast_pending:1, 277 bast_pending:1, 278 convert_pending:1, 279 lock_pending:1, 280 cancel_pending:1, 281 unlock_pending:1, 282 lksb_kernel_allocated:1; 283 }; 284 285 286 #define DLM_LKSB_UNUSED1 0x01 287 #define DLM_LKSB_PUT_LVB 0x02 288 #define DLM_LKSB_GET_LVB 0x04 289 #define DLM_LKSB_UNUSED2 0x08 290 #define DLM_LKSB_UNUSED3 0x10 291 #define DLM_LKSB_UNUSED4 0x20 292 #define DLM_LKSB_UNUSED5 0x40 293 #define DLM_LKSB_UNUSED6 0x80 294 295 296 enum dlm_lockres_list { 297 DLM_GRANTED_LIST = 0, 298 DLM_CONVERTING_LIST, 299 DLM_BLOCKED_LIST 300 }; 301 302 static inline struct list_head * 303 dlm_list_idx_to_ptr(struct dlm_lock_resource *res, enum dlm_lockres_list idx) 304 { 305 struct list_head *ret = NULL; 306 if (idx == DLM_GRANTED_LIST) 307 ret = &res->granted; 308 else if (idx == DLM_CONVERTING_LIST) 309 ret = &res->converting; 310 else if (idx == DLM_BLOCKED_LIST) 311 ret = &res->blocked; 312 else 313 BUG(); 314 return ret; 315 } 316 317 318 319 320 struct dlm_node_iter 321 { 322 unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; 323 int curnode; 324 }; 325 326 327 enum { 328 DLM_MASTER_REQUEST_MSG = 500, 329 DLM_UNUSED_MSG1, /* 501 */ 330 DLM_ASSERT_MASTER_MSG, /* 502 */ 331 DLM_CREATE_LOCK_MSG, /* 503 */ 332 DLM_CONVERT_LOCK_MSG, /* 504 */ 333 DLM_PROXY_AST_MSG, /* 505 */ 334 DLM_UNLOCK_LOCK_MSG, /* 506 */ 335 DLM_UNUSED_MSG2, /* 507 */ 336 DLM_MIGRATE_REQUEST_MSG, /* 508 */ 337 DLM_MIG_LOCKRES_MSG, /* 509 */ 338 DLM_QUERY_JOIN_MSG, /* 510 */ 339 DLM_ASSERT_JOINED_MSG, /* 511 */ 340 DLM_CANCEL_JOIN_MSG, /* 512 */ 341 DLM_EXIT_DOMAIN_MSG, /* 513 */ 342 DLM_MASTER_REQUERY_MSG, /* 514 */ 343 DLM_LOCK_REQUEST_MSG, /* 515 */ 344 DLM_RECO_DATA_DONE_MSG, /* 516 */ 345 DLM_BEGIN_RECO_MSG, /* 517 */ 346 DLM_FINALIZE_RECO_MSG /* 518 */ 347 }; 348 349 struct dlm_reco_node_data 350 { 351 int state; 352 u8 node_num; 353 struct list_head list; 354 }; 355 356 enum { 357 DLM_RECO_NODE_DATA_DEAD = -1, 358 DLM_RECO_NODE_DATA_INIT = 0, 359 DLM_RECO_NODE_DATA_REQUESTING, 360 DLM_RECO_NODE_DATA_REQUESTED, 361 DLM_RECO_NODE_DATA_RECEIVING, 362 DLM_RECO_NODE_DATA_DONE, 363 DLM_RECO_NODE_DATA_FINALIZE_SENT, 364 }; 365 366 367 enum { 368 DLM_MASTER_RESP_NO = 0, 369 DLM_MASTER_RESP_YES, 370 DLM_MASTER_RESP_MAYBE, 371 DLM_MASTER_RESP_ERROR 372 }; 373 374 375 struct dlm_master_request 376 { 377 u8 node_idx; 378 u8 namelen; 379 __be16 pad1; 380 __be32 flags; 381 382 u8 name[O2NM_MAX_NAME_LEN]; 383 }; 384 385 #define DLM_ASSERT_MASTER_MLE_CLEANUP 0x00000001 386 #define DLM_ASSERT_MASTER_REQUERY 0x00000002 387 #define DLM_ASSERT_MASTER_FINISH_MIGRATION 0x00000004 388 struct dlm_assert_master 389 { 390 u8 node_idx; 391 u8 namelen; 392 __be16 pad1; 393 __be32 flags; 394 395 u8 name[O2NM_MAX_NAME_LEN]; 396 }; 397 398 struct dlm_migrate_request 399 { 400 u8 master; 401 u8 new_master; 402 u8 namelen; 403 u8 pad1; 404 __be32 pad2; 405 u8 name[O2NM_MAX_NAME_LEN]; 406 }; 407 408 struct dlm_master_requery 409 { 410 u8 pad1; 411 u8 pad2; 412 u8 node_idx; 413 u8 namelen; 414 __be32 pad3; 415 u8 name[O2NM_MAX_NAME_LEN]; 416 }; 417 418 #define DLM_MRES_RECOVERY 0x01 419 #define DLM_MRES_MIGRATION 0x02 420 #define DLM_MRES_ALL_DONE 0x04 421 422 /* 423 * We would like to get one whole lockres into a single network 424 * message whenever possible. Generally speaking, there will be 425 * at most one dlm_lock on a lockres for each node in the cluster, 426 * plus (infrequently) any additional locks coming in from userdlm. 427 * 428 * struct _dlm_lockres_page 429 * { 430 * dlm_migratable_lockres mres; 431 * dlm_migratable_lock ml[DLM_MAX_MIGRATABLE_LOCKS]; 432 * u8 pad[DLM_MIG_LOCKRES_RESERVED]; 433 * }; 434 * 435 * from ../cluster/tcp.h 436 * NET_MAX_PAYLOAD_BYTES (4096 - sizeof(net_msg)) 437 * (roughly 4080 bytes) 438 * and sizeof(dlm_migratable_lockres) = 112 bytes 439 * and sizeof(dlm_migratable_lock) = 16 bytes 440 * 441 * Choosing DLM_MAX_MIGRATABLE_LOCKS=240 and 442 * DLM_MIG_LOCKRES_RESERVED=128 means we have this: 443 * 444 * (DLM_MAX_MIGRATABLE_LOCKS * sizeof(dlm_migratable_lock)) + 445 * sizeof(dlm_migratable_lockres) + DLM_MIG_LOCKRES_RESERVED = 446 * NET_MAX_PAYLOAD_BYTES 447 * (240 * 16) + 112 + 128 = 4080 448 * 449 * So a lockres would need more than 240 locks before it would 450 * use more than one network packet to recover. Not too bad. 451 */ 452 #define DLM_MAX_MIGRATABLE_LOCKS 240 453 454 struct dlm_migratable_lockres 455 { 456 u8 master; 457 u8 lockname_len; 458 u8 num_locks; // locks sent in this structure 459 u8 flags; 460 __be32 total_locks; // locks to be sent for this migration cookie 461 __be64 mig_cookie; // cookie for this lockres migration 462 // or zero if not needed 463 // 16 bytes 464 u8 lockname[DLM_LOCKID_NAME_MAX]; 465 // 48 bytes 466 u8 lvb[DLM_LVB_LEN]; 467 // 112 bytes 468 struct dlm_migratable_lock ml[0]; // 16 bytes each, begins at byte 112 469 }; 470 #define DLM_MIG_LOCKRES_MAX_LEN \ 471 (sizeof(struct dlm_migratable_lockres) + \ 472 (sizeof(struct dlm_migratable_lock) * \ 473 DLM_MAX_MIGRATABLE_LOCKS) ) 474 475 /* from above, 128 bytes 476 * for some undetermined future use */ 477 #define DLM_MIG_LOCKRES_RESERVED (NET_MAX_PAYLOAD_BYTES - \ 478 DLM_MIG_LOCKRES_MAX_LEN) 479 480 struct dlm_create_lock 481 { 482 __be64 cookie; 483 484 __be32 flags; 485 u8 pad1; 486 u8 node_idx; 487 s8 requested_type; 488 u8 namelen; 489 490 u8 name[O2NM_MAX_NAME_LEN]; 491 }; 492 493 struct dlm_convert_lock 494 { 495 __be64 cookie; 496 497 __be32 flags; 498 u8 pad1; 499 u8 node_idx; 500 s8 requested_type; 501 u8 namelen; 502 503 u8 name[O2NM_MAX_NAME_LEN]; 504 505 s8 lvb[0]; 506 }; 507 #define DLM_CONVERT_LOCK_MAX_LEN (sizeof(struct dlm_convert_lock)+DLM_LVB_LEN) 508 509 struct dlm_unlock_lock 510 { 511 __be64 cookie; 512 513 __be32 flags; 514 __be16 pad1; 515 u8 node_idx; 516 u8 namelen; 517 518 u8 name[O2NM_MAX_NAME_LEN]; 519 520 s8 lvb[0]; 521 }; 522 #define DLM_UNLOCK_LOCK_MAX_LEN (sizeof(struct dlm_unlock_lock)+DLM_LVB_LEN) 523 524 struct dlm_proxy_ast 525 { 526 __be64 cookie; 527 528 __be32 flags; 529 u8 node_idx; 530 u8 type; 531 u8 blocked_type; 532 u8 namelen; 533 534 u8 name[O2NM_MAX_NAME_LEN]; 535 536 s8 lvb[0]; 537 }; 538 #define DLM_PROXY_AST_MAX_LEN (sizeof(struct dlm_proxy_ast)+DLM_LVB_LEN) 539 540 #define DLM_MOD_KEY (0x666c6172) 541 enum dlm_query_join_response { 542 JOIN_DISALLOW = 0, 543 JOIN_OK, 544 JOIN_OK_NO_MAP, 545 }; 546 547 struct dlm_lock_request 548 { 549 u8 node_idx; 550 u8 dead_node; 551 __be16 pad1; 552 __be32 pad2; 553 }; 554 555 struct dlm_reco_data_done 556 { 557 u8 node_idx; 558 u8 dead_node; 559 __be16 pad1; 560 __be32 pad2; 561 562 /* unused for now */ 563 /* eventually we can use this to attempt 564 * lvb recovery based on each node's info */ 565 u8 reco_lvb[DLM_LVB_LEN]; 566 }; 567 568 struct dlm_begin_reco 569 { 570 u8 node_idx; 571 u8 dead_node; 572 __be16 pad1; 573 __be32 pad2; 574 }; 575 576 577 struct dlm_query_join_request 578 { 579 u8 node_idx; 580 u8 pad1[2]; 581 u8 name_len; 582 u8 domain[O2NM_MAX_NAME_LEN]; 583 }; 584 585 struct dlm_assert_joined 586 { 587 u8 node_idx; 588 u8 pad1[2]; 589 u8 name_len; 590 u8 domain[O2NM_MAX_NAME_LEN]; 591 }; 592 593 struct dlm_cancel_join 594 { 595 u8 node_idx; 596 u8 pad1[2]; 597 u8 name_len; 598 u8 domain[O2NM_MAX_NAME_LEN]; 599 }; 600 601 struct dlm_exit_domain 602 { 603 u8 node_idx; 604 u8 pad1[3]; 605 }; 606 607 struct dlm_finalize_reco 608 { 609 u8 node_idx; 610 u8 dead_node; 611 __be16 pad1; 612 __be32 pad2; 613 }; 614 615 static inline enum dlm_status 616 __dlm_lockres_state_to_status(struct dlm_lock_resource *res) 617 { 618 enum dlm_status status = DLM_NORMAL; 619 620 assert_spin_locked(&res->spinlock); 621 622 if (res->state & DLM_LOCK_RES_RECOVERING) 623 status = DLM_RECOVERING; 624 else if (res->state & DLM_LOCK_RES_MIGRATING) 625 status = DLM_MIGRATING; 626 else if (res->state & DLM_LOCK_RES_IN_PROGRESS) 627 status = DLM_FORWARD; 628 629 return status; 630 } 631 632 struct dlm_lock * dlm_new_lock(int type, u8 node, u64 cookie, 633 struct dlm_lockstatus *lksb); 634 void dlm_lock_get(struct dlm_lock *lock); 635 void dlm_lock_put(struct dlm_lock *lock); 636 637 void dlm_lock_attach_lockres(struct dlm_lock *lock, 638 struct dlm_lock_resource *res); 639 640 int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data); 641 int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data); 642 int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data); 643 644 void dlm_revert_pending_convert(struct dlm_lock_resource *res, 645 struct dlm_lock *lock); 646 void dlm_revert_pending_lock(struct dlm_lock_resource *res, 647 struct dlm_lock *lock); 648 649 int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data); 650 void dlm_commit_pending_cancel(struct dlm_lock_resource *res, 651 struct dlm_lock *lock); 652 void dlm_commit_pending_unlock(struct dlm_lock_resource *res, 653 struct dlm_lock *lock); 654 655 int dlm_launch_thread(struct dlm_ctxt *dlm); 656 void dlm_complete_thread(struct dlm_ctxt *dlm); 657 int dlm_launch_recovery_thread(struct dlm_ctxt *dlm); 658 void dlm_complete_recovery_thread(struct dlm_ctxt *dlm); 659 void dlm_wait_for_recovery(struct dlm_ctxt *dlm); 660 661 void dlm_put(struct dlm_ctxt *dlm); 662 struct dlm_ctxt *dlm_grab(struct dlm_ctxt *dlm); 663 int dlm_domain_fully_joined(struct dlm_ctxt *dlm); 664 665 void __dlm_lockres_calc_usage(struct dlm_ctxt *dlm, 666 struct dlm_lock_resource *res); 667 void dlm_lockres_calc_usage(struct dlm_ctxt *dlm, 668 struct dlm_lock_resource *res); 669 void dlm_purge_lockres(struct dlm_ctxt *dlm, 670 struct dlm_lock_resource *lockres); 671 void dlm_lockres_get(struct dlm_lock_resource *res); 672 void dlm_lockres_put(struct dlm_lock_resource *res); 673 void __dlm_unhash_lockres(struct dlm_lock_resource *res); 674 void __dlm_insert_lockres(struct dlm_ctxt *dlm, 675 struct dlm_lock_resource *res); 676 struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm, 677 const char *name, 678 unsigned int len); 679 struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm, 680 const char *name, 681 unsigned int len); 682 683 int dlm_is_host_down(int errno); 684 void dlm_change_lockres_owner(struct dlm_ctxt *dlm, 685 struct dlm_lock_resource *res, 686 u8 owner); 687 struct dlm_lock_resource * dlm_get_lock_resource(struct dlm_ctxt *dlm, 688 const char *lockid, 689 int flags); 690 struct dlm_lock_resource *dlm_new_lockres(struct dlm_ctxt *dlm, 691 const char *name, 692 unsigned int namelen); 693 694 void dlm_queue_ast(struct dlm_ctxt *dlm, struct dlm_lock *lock); 695 void dlm_queue_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock); 696 void dlm_do_local_ast(struct dlm_ctxt *dlm, 697 struct dlm_lock_resource *res, 698 struct dlm_lock *lock); 699 int dlm_do_remote_ast(struct dlm_ctxt *dlm, 700 struct dlm_lock_resource *res, 701 struct dlm_lock *lock); 702 void dlm_do_local_bast(struct dlm_ctxt *dlm, 703 struct dlm_lock_resource *res, 704 struct dlm_lock *lock, 705 int blocked_type); 706 int dlm_send_proxy_ast_msg(struct dlm_ctxt *dlm, 707 struct dlm_lock_resource *res, 708 struct dlm_lock *lock, 709 int msg_type, 710 int blocked_type, int flags); 711 static inline int dlm_send_proxy_bast(struct dlm_ctxt *dlm, 712 struct dlm_lock_resource *res, 713 struct dlm_lock *lock, 714 int blocked_type) 715 { 716 return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_BAST, 717 blocked_type, 0); 718 } 719 720 static inline int dlm_send_proxy_ast(struct dlm_ctxt *dlm, 721 struct dlm_lock_resource *res, 722 struct dlm_lock *lock, 723 int flags) 724 { 725 return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_AST, 726 0, flags); 727 } 728 729 void dlm_print_one_lock_resource(struct dlm_lock_resource *res); 730 void __dlm_print_one_lock_resource(struct dlm_lock_resource *res); 731 732 u8 dlm_nm_this_node(struct dlm_ctxt *dlm); 733 void dlm_kick_thread(struct dlm_ctxt *dlm, struct dlm_lock_resource *res); 734 void __dlm_dirty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res); 735 736 737 int dlm_nm_init(struct dlm_ctxt *dlm); 738 int dlm_heartbeat_init(struct dlm_ctxt *dlm); 739 void dlm_hb_node_down_cb(struct o2nm_node *node, int idx, void *data); 740 void dlm_hb_node_up_cb(struct o2nm_node *node, int idx, void *data); 741 742 int dlm_lockres_is_dirty(struct dlm_ctxt *dlm, struct dlm_lock_resource *res); 743 int dlm_migrate_lockres(struct dlm_ctxt *dlm, 744 struct dlm_lock_resource *res, 745 u8 target); 746 int dlm_finish_migration(struct dlm_ctxt *dlm, 747 struct dlm_lock_resource *res, 748 u8 old_master); 749 void dlm_lockres_release_ast(struct dlm_ctxt *dlm, 750 struct dlm_lock_resource *res); 751 void __dlm_lockres_reserve_ast(struct dlm_lock_resource *res); 752 753 int dlm_master_request_handler(struct o2net_msg *msg, u32 len, void *data); 754 int dlm_assert_master_handler(struct o2net_msg *msg, u32 len, void *data); 755 int dlm_migrate_request_handler(struct o2net_msg *msg, u32 len, void *data); 756 int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data); 757 int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data); 758 int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data); 759 int dlm_reco_data_done_handler(struct o2net_msg *msg, u32 len, void *data); 760 int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data); 761 int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data); 762 763 int dlm_dispatch_assert_master(struct dlm_ctxt *dlm, 764 struct dlm_lock_resource *res, 765 int ignore_higher, 766 u8 request_from, 767 u32 flags); 768 769 770 int dlm_send_one_lockres(struct dlm_ctxt *dlm, 771 struct dlm_lock_resource *res, 772 struct dlm_migratable_lockres *mres, 773 u8 send_to, 774 u8 flags); 775 void dlm_move_lockres_to_recovery_list(struct dlm_ctxt *dlm, 776 struct dlm_lock_resource *res); 777 778 /* will exit holding res->spinlock, but may drop in function */ 779 void __dlm_wait_on_lockres_flags(struct dlm_lock_resource *res, int flags); 780 void __dlm_wait_on_lockres_flags_set(struct dlm_lock_resource *res, int flags); 781 782 /* will exit holding res->spinlock, but may drop in function */ 783 static inline void __dlm_wait_on_lockres(struct dlm_lock_resource *res) 784 { 785 __dlm_wait_on_lockres_flags(res, (DLM_LOCK_RES_IN_PROGRESS| 786 DLM_LOCK_RES_RECOVERING| 787 DLM_LOCK_RES_MIGRATING)); 788 } 789 790 791 int dlm_init_mle_cache(void); 792 void dlm_destroy_mle_cache(void); 793 void dlm_hb_event_notify_attached(struct dlm_ctxt *dlm, int idx, int node_up); 794 void dlm_clean_master_list(struct dlm_ctxt *dlm, 795 u8 dead_node); 796 int dlm_lock_basts_flushed(struct dlm_ctxt *dlm, struct dlm_lock *lock); 797 798 799 static inline const char * dlm_lock_mode_name(int mode) 800 { 801 switch (mode) { 802 case LKM_EXMODE: 803 return "EX"; 804 case LKM_PRMODE: 805 return "PR"; 806 case LKM_NLMODE: 807 return "NL"; 808 } 809 return "UNKNOWN"; 810 } 811 812 813 static inline int dlm_lock_compatible(int existing, int request) 814 { 815 /* NO_LOCK compatible with all */ 816 if (request == LKM_NLMODE || 817 existing == LKM_NLMODE) 818 return 1; 819 820 /* EX incompatible with all non-NO_LOCK */ 821 if (request == LKM_EXMODE) 822 return 0; 823 824 /* request must be PR, which is compatible with PR */ 825 if (existing == LKM_PRMODE) 826 return 1; 827 828 return 0; 829 } 830 831 static inline int dlm_lock_on_list(struct list_head *head, 832 struct dlm_lock *lock) 833 { 834 struct list_head *iter; 835 struct dlm_lock *tmplock; 836 837 list_for_each(iter, head) { 838 tmplock = list_entry(iter, struct dlm_lock, list); 839 if (tmplock == lock) 840 return 1; 841 } 842 return 0; 843 } 844 845 846 static inline enum dlm_status dlm_err_to_dlm_status(int err) 847 { 848 enum dlm_status ret; 849 if (err == -ENOMEM) 850 ret = DLM_SYSERR; 851 else if (err == -ETIMEDOUT || o2net_link_down(err, NULL)) 852 ret = DLM_NOLOCKMGR; 853 else if (err == -EINVAL) 854 ret = DLM_BADPARAM; 855 else if (err == -ENAMETOOLONG) 856 ret = DLM_IVBUFLEN; 857 else 858 ret = DLM_BADARGS; 859 return ret; 860 } 861 862 863 static inline void dlm_node_iter_init(unsigned long *map, 864 struct dlm_node_iter *iter) 865 { 866 memcpy(iter->node_map, map, sizeof(iter->node_map)); 867 iter->curnode = -1; 868 } 869 870 static inline int dlm_node_iter_next(struct dlm_node_iter *iter) 871 { 872 int bit; 873 bit = find_next_bit(iter->node_map, O2NM_MAX_NODES, iter->curnode+1); 874 if (bit >= O2NM_MAX_NODES) { 875 iter->curnode = O2NM_MAX_NODES; 876 return -ENOENT; 877 } 878 iter->curnode = bit; 879 return bit; 880 } 881 882 883 884 #endif /* DLMCOMMON_H */ 885