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_SIZE_DEFAULT (1 << 14) 41 #if DLM_HASH_SIZE_DEFAULT < PAGE_SIZE 42 # define DLM_HASH_PAGES 1 43 #else 44 # define DLM_HASH_PAGES (DLM_HASH_SIZE_DEFAULT / PAGE_SIZE) 45 #endif 46 #define DLM_BUCKETS_PER_PAGE (PAGE_SIZE / sizeof(struct hlist_head)) 47 #define DLM_HASH_BUCKETS (DLM_HASH_PAGES * DLM_BUCKETS_PER_PAGE) 48 49 /* Intended to make it easier for us to switch out hash functions */ 50 #define dlm_lockid_hash(_n, _l) full_name_hash(_n, _l) 51 52 enum dlm_mle_type { 53 DLM_MLE_BLOCK, 54 DLM_MLE_MASTER, 55 DLM_MLE_MIGRATION 56 }; 57 58 struct dlm_lock_name { 59 u8 len; 60 u8 name[DLM_LOCKID_NAME_MAX]; 61 }; 62 63 struct dlm_master_list_entry { 64 struct list_head list; 65 struct list_head hb_events; 66 struct dlm_ctxt *dlm; 67 spinlock_t spinlock; 68 wait_queue_head_t wq; 69 atomic_t woken; 70 struct kref mle_refs; 71 int inuse; 72 unsigned long maybe_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; 73 unsigned long vote_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; 74 unsigned long response_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; 75 unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; 76 u8 master; 77 u8 new_master; 78 enum dlm_mle_type type; 79 struct o2hb_callback_func mle_hb_up; 80 struct o2hb_callback_func mle_hb_down; 81 union { 82 struct dlm_lock_resource *res; 83 struct dlm_lock_name name; 84 } u; 85 }; 86 87 enum dlm_ast_type { 88 DLM_AST = 0, 89 DLM_BAST, 90 DLM_ASTUNLOCK 91 }; 92 93 94 #define LKM_VALID_FLAGS (LKM_VALBLK | LKM_CONVERT | LKM_UNLOCK | \ 95 LKM_CANCEL | LKM_INVVALBLK | LKM_FORCE | \ 96 LKM_RECOVERY | LKM_LOCAL | LKM_NOQUEUE) 97 98 #define DLM_RECOVERY_LOCK_NAME "$RECOVERY" 99 #define DLM_RECOVERY_LOCK_NAME_LEN 9 100 101 static inline int dlm_is_recovery_lock(const char *lock_name, int name_len) 102 { 103 if (name_len == DLM_RECOVERY_LOCK_NAME_LEN && 104 memcmp(lock_name, DLM_RECOVERY_LOCK_NAME, name_len)==0) 105 return 1; 106 return 0; 107 } 108 109 #define DLM_RECO_STATE_ACTIVE 0x0001 110 #define DLM_RECO_STATE_FINALIZE 0x0002 111 112 struct dlm_recovery_ctxt 113 { 114 struct list_head resources; 115 struct list_head received; 116 struct list_head node_data; 117 u8 new_master; 118 u8 dead_node; 119 u16 state; 120 unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; 121 wait_queue_head_t event; 122 }; 123 124 enum dlm_ctxt_state { 125 DLM_CTXT_NEW = 0, 126 DLM_CTXT_JOINED, 127 DLM_CTXT_IN_SHUTDOWN, 128 DLM_CTXT_LEAVING, 129 }; 130 131 struct dlm_ctxt 132 { 133 struct list_head list; 134 struct hlist_head **lockres_hash; 135 struct list_head dirty_list; 136 struct list_head purge_list; 137 struct list_head pending_asts; 138 struct list_head pending_basts; 139 struct list_head tracking_list; 140 unsigned int purge_count; 141 spinlock_t spinlock; 142 spinlock_t ast_lock; 143 spinlock_t track_lock; 144 char *name; 145 u8 node_num; 146 u32 key; 147 u8 joining_node; 148 wait_queue_head_t dlm_join_events; 149 unsigned long live_nodes_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; 150 unsigned long domain_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; 151 unsigned long recovery_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; 152 struct dlm_recovery_ctxt reco; 153 spinlock_t master_lock; 154 struct list_head master_list; 155 struct list_head mle_hb_events; 156 157 /* these give a really vague idea of the system load */ 158 atomic_t local_resources; 159 atomic_t remote_resources; 160 atomic_t unknown_resources; 161 162 struct dlm_debug_ctxt *dlm_debug_ctxt; 163 struct dentry *dlm_debugfs_subroot; 164 165 /* NOTE: Next three are protected by dlm_domain_lock */ 166 struct kref dlm_refs; 167 enum dlm_ctxt_state dlm_state; 168 unsigned int num_joins; 169 170 struct o2hb_callback_func dlm_hb_up; 171 struct o2hb_callback_func dlm_hb_down; 172 struct task_struct *dlm_thread_task; 173 struct task_struct *dlm_reco_thread_task; 174 struct workqueue_struct *dlm_worker; 175 wait_queue_head_t dlm_thread_wq; 176 wait_queue_head_t dlm_reco_thread_wq; 177 wait_queue_head_t ast_wq; 178 wait_queue_head_t migration_wq; 179 180 struct work_struct dispatched_work; 181 struct list_head work_list; 182 spinlock_t work_lock; 183 struct list_head dlm_domain_handlers; 184 struct list_head dlm_eviction_callbacks; 185 186 /* The filesystem specifies this at domain registration. We 187 * cache it here to know what to tell other nodes. */ 188 struct dlm_protocol_version fs_locking_proto; 189 /* This is the inter-dlm communication version */ 190 struct dlm_protocol_version dlm_locking_proto; 191 }; 192 193 static inline struct hlist_head *dlm_lockres_hash(struct dlm_ctxt *dlm, unsigned i) 194 { 195 return dlm->lockres_hash[(i / DLM_BUCKETS_PER_PAGE) % DLM_HASH_PAGES] + (i % DLM_BUCKETS_PER_PAGE); 196 } 197 198 /* these keventd work queue items are for less-frequently 199 * called functions that cannot be directly called from the 200 * net message handlers for some reason, usually because 201 * they need to send net messages of their own. */ 202 void dlm_dispatch_work(struct work_struct *work); 203 204 struct dlm_lock_resource; 205 struct dlm_work_item; 206 207 typedef void (dlm_workfunc_t)(struct dlm_work_item *, void *); 208 209 struct dlm_request_all_locks_priv 210 { 211 u8 reco_master; 212 u8 dead_node; 213 }; 214 215 struct dlm_mig_lockres_priv 216 { 217 struct dlm_lock_resource *lockres; 218 u8 real_master; 219 u8 extra_ref; 220 }; 221 222 struct dlm_assert_master_priv 223 { 224 struct dlm_lock_resource *lockres; 225 u8 request_from; 226 u32 flags; 227 unsigned ignore_higher:1; 228 }; 229 230 struct dlm_deref_lockres_priv 231 { 232 struct dlm_lock_resource *deref_res; 233 u8 deref_node; 234 }; 235 236 struct dlm_work_item 237 { 238 struct list_head list; 239 dlm_workfunc_t *func; 240 struct dlm_ctxt *dlm; 241 void *data; 242 union { 243 struct dlm_request_all_locks_priv ral; 244 struct dlm_mig_lockres_priv ml; 245 struct dlm_assert_master_priv am; 246 struct dlm_deref_lockres_priv dl; 247 } u; 248 }; 249 250 static inline void dlm_init_work_item(struct dlm_ctxt *dlm, 251 struct dlm_work_item *i, 252 dlm_workfunc_t *f, void *data) 253 { 254 memset(i, 0, sizeof(*i)); 255 i->func = f; 256 INIT_LIST_HEAD(&i->list); 257 i->data = data; 258 i->dlm = dlm; /* must have already done a dlm_grab on this! */ 259 } 260 261 262 263 static inline void __dlm_set_joining_node(struct dlm_ctxt *dlm, 264 u8 node) 265 { 266 assert_spin_locked(&dlm->spinlock); 267 268 dlm->joining_node = node; 269 wake_up(&dlm->dlm_join_events); 270 } 271 272 #define DLM_LOCK_RES_UNINITED 0x00000001 273 #define DLM_LOCK_RES_RECOVERING 0x00000002 274 #define DLM_LOCK_RES_READY 0x00000004 275 #define DLM_LOCK_RES_DIRTY 0x00000008 276 #define DLM_LOCK_RES_IN_PROGRESS 0x00000010 277 #define DLM_LOCK_RES_MIGRATING 0x00000020 278 #define DLM_LOCK_RES_DROPPING_REF 0x00000040 279 #define DLM_LOCK_RES_BLOCK_DIRTY 0x00001000 280 #define DLM_LOCK_RES_SETREF_INPROG 0x00002000 281 282 /* max milliseconds to wait to sync up a network failure with a node death */ 283 #define DLM_NODE_DEATH_WAIT_MAX (5 * 1000) 284 285 #define DLM_PURGE_INTERVAL_MS (8 * 1000) 286 287 struct dlm_lock_resource 288 { 289 /* WARNING: Please see the comment in dlm_init_lockres before 290 * adding fields here. */ 291 struct hlist_node hash_node; 292 struct qstr lockname; 293 struct kref refs; 294 295 /* 296 * Please keep granted, converting, and blocked in this order, 297 * as some funcs want to iterate over all lists. 298 * 299 * All four lists are protected by the hash's reference. 300 */ 301 struct list_head granted; 302 struct list_head converting; 303 struct list_head blocked; 304 struct list_head purge; 305 306 /* 307 * These two lists require you to hold an additional reference 308 * while they are on the list. 309 */ 310 struct list_head dirty; 311 struct list_head recovering; // dlm_recovery_ctxt.resources list 312 313 /* Added during init and removed during release */ 314 struct list_head tracking; /* dlm->tracking_list */ 315 316 /* unused lock resources have their last_used stamped and are 317 * put on a list for the dlm thread to run. */ 318 unsigned long last_used; 319 320 struct dlm_ctxt *dlm; 321 322 unsigned migration_pending:1; 323 atomic_t asts_reserved; 324 spinlock_t spinlock; 325 wait_queue_head_t wq; 326 u8 owner; //node which owns the lock resource, or unknown 327 u16 state; 328 char lvb[DLM_LVB_LEN]; 329 unsigned int inflight_locks; 330 unsigned long refmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; 331 }; 332 333 struct dlm_migratable_lock 334 { 335 __be64 cookie; 336 337 /* these 3 are just padding for the in-memory structure, but 338 * list and flags are actually used when sent over the wire */ 339 __be16 pad1; 340 u8 list; // 0=granted, 1=converting, 2=blocked 341 u8 flags; 342 343 s8 type; 344 s8 convert_type; 345 s8 highest_blocked; 346 u8 node; 347 }; // 16 bytes 348 349 struct dlm_lock 350 { 351 struct dlm_migratable_lock ml; 352 353 struct list_head list; 354 struct list_head ast_list; 355 struct list_head bast_list; 356 struct dlm_lock_resource *lockres; 357 spinlock_t spinlock; 358 struct kref lock_refs; 359 360 // ast and bast must be callable while holding a spinlock! 361 dlm_astlockfunc_t *ast; 362 dlm_bastlockfunc_t *bast; 363 void *astdata; 364 struct dlm_lockstatus *lksb; 365 unsigned ast_pending:1, 366 bast_pending:1, 367 convert_pending:1, 368 lock_pending:1, 369 cancel_pending:1, 370 unlock_pending:1, 371 lksb_kernel_allocated:1; 372 }; 373 374 375 #define DLM_LKSB_UNUSED1 0x01 376 #define DLM_LKSB_PUT_LVB 0x02 377 #define DLM_LKSB_GET_LVB 0x04 378 #define DLM_LKSB_UNUSED2 0x08 379 #define DLM_LKSB_UNUSED3 0x10 380 #define DLM_LKSB_UNUSED4 0x20 381 #define DLM_LKSB_UNUSED5 0x40 382 #define DLM_LKSB_UNUSED6 0x80 383 384 385 enum dlm_lockres_list { 386 DLM_GRANTED_LIST = 0, 387 DLM_CONVERTING_LIST, 388 DLM_BLOCKED_LIST 389 }; 390 391 static inline int dlm_lvb_is_empty(char *lvb) 392 { 393 int i; 394 for (i=0; i<DLM_LVB_LEN; i++) 395 if (lvb[i]) 396 return 0; 397 return 1; 398 } 399 400 static inline struct list_head * 401 dlm_list_idx_to_ptr(struct dlm_lock_resource *res, enum dlm_lockres_list idx) 402 { 403 struct list_head *ret = NULL; 404 if (idx == DLM_GRANTED_LIST) 405 ret = &res->granted; 406 else if (idx == DLM_CONVERTING_LIST) 407 ret = &res->converting; 408 else if (idx == DLM_BLOCKED_LIST) 409 ret = &res->blocked; 410 else 411 BUG(); 412 return ret; 413 } 414 415 416 417 418 struct dlm_node_iter 419 { 420 unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; 421 int curnode; 422 }; 423 424 425 enum { 426 DLM_MASTER_REQUEST_MSG = 500, 427 DLM_UNUSED_MSG1, /* 501 */ 428 DLM_ASSERT_MASTER_MSG, /* 502 */ 429 DLM_CREATE_LOCK_MSG, /* 503 */ 430 DLM_CONVERT_LOCK_MSG, /* 504 */ 431 DLM_PROXY_AST_MSG, /* 505 */ 432 DLM_UNLOCK_LOCK_MSG, /* 506 */ 433 DLM_DEREF_LOCKRES_MSG, /* 507 */ 434 DLM_MIGRATE_REQUEST_MSG, /* 508 */ 435 DLM_MIG_LOCKRES_MSG, /* 509 */ 436 DLM_QUERY_JOIN_MSG, /* 510 */ 437 DLM_ASSERT_JOINED_MSG, /* 511 */ 438 DLM_CANCEL_JOIN_MSG, /* 512 */ 439 DLM_EXIT_DOMAIN_MSG, /* 513 */ 440 DLM_MASTER_REQUERY_MSG, /* 514 */ 441 DLM_LOCK_REQUEST_MSG, /* 515 */ 442 DLM_RECO_DATA_DONE_MSG, /* 516 */ 443 DLM_BEGIN_RECO_MSG, /* 517 */ 444 DLM_FINALIZE_RECO_MSG /* 518 */ 445 }; 446 447 struct dlm_reco_node_data 448 { 449 int state; 450 u8 node_num; 451 struct list_head list; 452 }; 453 454 enum { 455 DLM_RECO_NODE_DATA_DEAD = -1, 456 DLM_RECO_NODE_DATA_INIT = 0, 457 DLM_RECO_NODE_DATA_REQUESTING, 458 DLM_RECO_NODE_DATA_REQUESTED, 459 DLM_RECO_NODE_DATA_RECEIVING, 460 DLM_RECO_NODE_DATA_DONE, 461 DLM_RECO_NODE_DATA_FINALIZE_SENT, 462 }; 463 464 465 enum { 466 DLM_MASTER_RESP_NO = 0, 467 DLM_MASTER_RESP_YES, 468 DLM_MASTER_RESP_MAYBE, 469 DLM_MASTER_RESP_ERROR 470 }; 471 472 473 struct dlm_master_request 474 { 475 u8 node_idx; 476 u8 namelen; 477 __be16 pad1; 478 __be32 flags; 479 480 u8 name[O2NM_MAX_NAME_LEN]; 481 }; 482 483 #define DLM_ASSERT_RESPONSE_REASSERT 0x00000001 484 #define DLM_ASSERT_RESPONSE_MASTERY_REF 0x00000002 485 486 #define DLM_ASSERT_MASTER_MLE_CLEANUP 0x00000001 487 #define DLM_ASSERT_MASTER_REQUERY 0x00000002 488 #define DLM_ASSERT_MASTER_FINISH_MIGRATION 0x00000004 489 struct dlm_assert_master 490 { 491 u8 node_idx; 492 u8 namelen; 493 __be16 pad1; 494 __be32 flags; 495 496 u8 name[O2NM_MAX_NAME_LEN]; 497 }; 498 499 #define DLM_MIGRATE_RESPONSE_MASTERY_REF 0x00000001 500 501 struct dlm_migrate_request 502 { 503 u8 master; 504 u8 new_master; 505 u8 namelen; 506 u8 pad1; 507 __be32 pad2; 508 u8 name[O2NM_MAX_NAME_LEN]; 509 }; 510 511 struct dlm_master_requery 512 { 513 u8 pad1; 514 u8 pad2; 515 u8 node_idx; 516 u8 namelen; 517 __be32 pad3; 518 u8 name[O2NM_MAX_NAME_LEN]; 519 }; 520 521 #define DLM_MRES_RECOVERY 0x01 522 #define DLM_MRES_MIGRATION 0x02 523 #define DLM_MRES_ALL_DONE 0x04 524 525 /* 526 * We would like to get one whole lockres into a single network 527 * message whenever possible. Generally speaking, there will be 528 * at most one dlm_lock on a lockres for each node in the cluster, 529 * plus (infrequently) any additional locks coming in from userdlm. 530 * 531 * struct _dlm_lockres_page 532 * { 533 * dlm_migratable_lockres mres; 534 * dlm_migratable_lock ml[DLM_MAX_MIGRATABLE_LOCKS]; 535 * u8 pad[DLM_MIG_LOCKRES_RESERVED]; 536 * }; 537 * 538 * from ../cluster/tcp.h 539 * NET_MAX_PAYLOAD_BYTES (4096 - sizeof(net_msg)) 540 * (roughly 4080 bytes) 541 * and sizeof(dlm_migratable_lockres) = 112 bytes 542 * and sizeof(dlm_migratable_lock) = 16 bytes 543 * 544 * Choosing DLM_MAX_MIGRATABLE_LOCKS=240 and 545 * DLM_MIG_LOCKRES_RESERVED=128 means we have this: 546 * 547 * (DLM_MAX_MIGRATABLE_LOCKS * sizeof(dlm_migratable_lock)) + 548 * sizeof(dlm_migratable_lockres) + DLM_MIG_LOCKRES_RESERVED = 549 * NET_MAX_PAYLOAD_BYTES 550 * (240 * 16) + 112 + 128 = 4080 551 * 552 * So a lockres would need more than 240 locks before it would 553 * use more than one network packet to recover. Not too bad. 554 */ 555 #define DLM_MAX_MIGRATABLE_LOCKS 240 556 557 struct dlm_migratable_lockres 558 { 559 u8 master; 560 u8 lockname_len; 561 u8 num_locks; // locks sent in this structure 562 u8 flags; 563 __be32 total_locks; // locks to be sent for this migration cookie 564 __be64 mig_cookie; // cookie for this lockres migration 565 // or zero if not needed 566 // 16 bytes 567 u8 lockname[DLM_LOCKID_NAME_MAX]; 568 // 48 bytes 569 u8 lvb[DLM_LVB_LEN]; 570 // 112 bytes 571 struct dlm_migratable_lock ml[0]; // 16 bytes each, begins at byte 112 572 }; 573 #define DLM_MIG_LOCKRES_MAX_LEN \ 574 (sizeof(struct dlm_migratable_lockres) + \ 575 (sizeof(struct dlm_migratable_lock) * \ 576 DLM_MAX_MIGRATABLE_LOCKS) ) 577 578 /* from above, 128 bytes 579 * for some undetermined future use */ 580 #define DLM_MIG_LOCKRES_RESERVED (NET_MAX_PAYLOAD_BYTES - \ 581 DLM_MIG_LOCKRES_MAX_LEN) 582 583 struct dlm_create_lock 584 { 585 __be64 cookie; 586 587 __be32 flags; 588 u8 pad1; 589 u8 node_idx; 590 s8 requested_type; 591 u8 namelen; 592 593 u8 name[O2NM_MAX_NAME_LEN]; 594 }; 595 596 struct dlm_convert_lock 597 { 598 __be64 cookie; 599 600 __be32 flags; 601 u8 pad1; 602 u8 node_idx; 603 s8 requested_type; 604 u8 namelen; 605 606 u8 name[O2NM_MAX_NAME_LEN]; 607 608 s8 lvb[0]; 609 }; 610 #define DLM_CONVERT_LOCK_MAX_LEN (sizeof(struct dlm_convert_lock)+DLM_LVB_LEN) 611 612 struct dlm_unlock_lock 613 { 614 __be64 cookie; 615 616 __be32 flags; 617 __be16 pad1; 618 u8 node_idx; 619 u8 namelen; 620 621 u8 name[O2NM_MAX_NAME_LEN]; 622 623 s8 lvb[0]; 624 }; 625 #define DLM_UNLOCK_LOCK_MAX_LEN (sizeof(struct dlm_unlock_lock)+DLM_LVB_LEN) 626 627 struct dlm_proxy_ast 628 { 629 __be64 cookie; 630 631 __be32 flags; 632 u8 node_idx; 633 u8 type; 634 u8 blocked_type; 635 u8 namelen; 636 637 u8 name[O2NM_MAX_NAME_LEN]; 638 639 s8 lvb[0]; 640 }; 641 #define DLM_PROXY_AST_MAX_LEN (sizeof(struct dlm_proxy_ast)+DLM_LVB_LEN) 642 643 #define DLM_MOD_KEY (0x666c6172) 644 enum dlm_query_join_response_code { 645 JOIN_DISALLOW = 0, 646 JOIN_OK, 647 JOIN_OK_NO_MAP, 648 JOIN_PROTOCOL_MISMATCH, 649 }; 650 651 struct dlm_query_join_packet { 652 u8 code; /* Response code. dlm_minor and fs_minor 653 are only valid if this is JOIN_OK */ 654 u8 dlm_minor; /* The minor version of the protocol the 655 dlm is speaking. */ 656 u8 fs_minor; /* The minor version of the protocol the 657 filesystem is speaking. */ 658 u8 reserved; 659 }; 660 661 union dlm_query_join_response { 662 u32 intval; 663 struct dlm_query_join_packet packet; 664 }; 665 666 struct dlm_lock_request 667 { 668 u8 node_idx; 669 u8 dead_node; 670 __be16 pad1; 671 __be32 pad2; 672 }; 673 674 struct dlm_reco_data_done 675 { 676 u8 node_idx; 677 u8 dead_node; 678 __be16 pad1; 679 __be32 pad2; 680 681 /* unused for now */ 682 /* eventually we can use this to attempt 683 * lvb recovery based on each node's info */ 684 u8 reco_lvb[DLM_LVB_LEN]; 685 }; 686 687 struct dlm_begin_reco 688 { 689 u8 node_idx; 690 u8 dead_node; 691 __be16 pad1; 692 __be32 pad2; 693 }; 694 695 696 #define BITS_PER_BYTE 8 697 #define BITS_TO_BYTES(bits) (((bits)+BITS_PER_BYTE-1)/BITS_PER_BYTE) 698 699 struct dlm_query_join_request 700 { 701 u8 node_idx; 702 u8 pad1[2]; 703 u8 name_len; 704 struct dlm_protocol_version dlm_proto; 705 struct dlm_protocol_version fs_proto; 706 u8 domain[O2NM_MAX_NAME_LEN]; 707 u8 node_map[BITS_TO_BYTES(O2NM_MAX_NODES)]; 708 }; 709 710 struct dlm_assert_joined 711 { 712 u8 node_idx; 713 u8 pad1[2]; 714 u8 name_len; 715 u8 domain[O2NM_MAX_NAME_LEN]; 716 }; 717 718 struct dlm_cancel_join 719 { 720 u8 node_idx; 721 u8 pad1[2]; 722 u8 name_len; 723 u8 domain[O2NM_MAX_NAME_LEN]; 724 }; 725 726 struct dlm_exit_domain 727 { 728 u8 node_idx; 729 u8 pad1[3]; 730 }; 731 732 struct dlm_finalize_reco 733 { 734 u8 node_idx; 735 u8 dead_node; 736 u8 flags; 737 u8 pad1; 738 __be32 pad2; 739 }; 740 741 struct dlm_deref_lockres 742 { 743 u32 pad1; 744 u16 pad2; 745 u8 node_idx; 746 u8 namelen; 747 748 u8 name[O2NM_MAX_NAME_LEN]; 749 }; 750 751 static inline enum dlm_status 752 __dlm_lockres_state_to_status(struct dlm_lock_resource *res) 753 { 754 enum dlm_status status = DLM_NORMAL; 755 756 assert_spin_locked(&res->spinlock); 757 758 if (res->state & DLM_LOCK_RES_RECOVERING) 759 status = DLM_RECOVERING; 760 else if (res->state & DLM_LOCK_RES_MIGRATING) 761 status = DLM_MIGRATING; 762 else if (res->state & DLM_LOCK_RES_IN_PROGRESS) 763 status = DLM_FORWARD; 764 765 return status; 766 } 767 768 static inline u8 dlm_get_lock_cookie_node(u64 cookie) 769 { 770 u8 ret; 771 cookie >>= 56; 772 ret = (u8)(cookie & 0xffULL); 773 return ret; 774 } 775 776 static inline unsigned long long dlm_get_lock_cookie_seq(u64 cookie) 777 { 778 unsigned long long ret; 779 ret = ((unsigned long long)cookie) & 0x00ffffffffffffffULL; 780 return ret; 781 } 782 783 struct dlm_lock * dlm_new_lock(int type, u8 node, u64 cookie, 784 struct dlm_lockstatus *lksb); 785 void dlm_lock_get(struct dlm_lock *lock); 786 void dlm_lock_put(struct dlm_lock *lock); 787 788 void dlm_lock_attach_lockres(struct dlm_lock *lock, 789 struct dlm_lock_resource *res); 790 791 int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data, 792 void **ret_data); 793 int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data, 794 void **ret_data); 795 int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data, 796 void **ret_data); 797 798 void dlm_revert_pending_convert(struct dlm_lock_resource *res, 799 struct dlm_lock *lock); 800 void dlm_revert_pending_lock(struct dlm_lock_resource *res, 801 struct dlm_lock *lock); 802 803 int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data, 804 void **ret_data); 805 void dlm_commit_pending_cancel(struct dlm_lock_resource *res, 806 struct dlm_lock *lock); 807 void dlm_commit_pending_unlock(struct dlm_lock_resource *res, 808 struct dlm_lock *lock); 809 810 int dlm_launch_thread(struct dlm_ctxt *dlm); 811 void dlm_complete_thread(struct dlm_ctxt *dlm); 812 int dlm_launch_recovery_thread(struct dlm_ctxt *dlm); 813 void dlm_complete_recovery_thread(struct dlm_ctxt *dlm); 814 void dlm_wait_for_recovery(struct dlm_ctxt *dlm); 815 void dlm_kick_recovery_thread(struct dlm_ctxt *dlm); 816 int dlm_is_node_dead(struct dlm_ctxt *dlm, u8 node); 817 int dlm_wait_for_node_death(struct dlm_ctxt *dlm, u8 node, int timeout); 818 int dlm_wait_for_node_recovery(struct dlm_ctxt *dlm, u8 node, int timeout); 819 820 void dlm_put(struct dlm_ctxt *dlm); 821 struct dlm_ctxt *dlm_grab(struct dlm_ctxt *dlm); 822 int dlm_domain_fully_joined(struct dlm_ctxt *dlm); 823 824 void __dlm_lockres_calc_usage(struct dlm_ctxt *dlm, 825 struct dlm_lock_resource *res); 826 void dlm_lockres_calc_usage(struct dlm_ctxt *dlm, 827 struct dlm_lock_resource *res); 828 static inline void dlm_lockres_get(struct dlm_lock_resource *res) 829 { 830 /* This is called on every lookup, so it might be worth 831 * inlining. */ 832 kref_get(&res->refs); 833 } 834 void dlm_lockres_put(struct dlm_lock_resource *res); 835 void __dlm_unhash_lockres(struct dlm_lock_resource *res); 836 void __dlm_insert_lockres(struct dlm_ctxt *dlm, 837 struct dlm_lock_resource *res); 838 struct dlm_lock_resource * __dlm_lookup_lockres_full(struct dlm_ctxt *dlm, 839 const char *name, 840 unsigned int len, 841 unsigned int hash); 842 struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm, 843 const char *name, 844 unsigned int len, 845 unsigned int hash); 846 struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm, 847 const char *name, 848 unsigned int len); 849 850 int dlm_is_host_down(int errno); 851 void dlm_change_lockres_owner(struct dlm_ctxt *dlm, 852 struct dlm_lock_resource *res, 853 u8 owner); 854 struct dlm_lock_resource * dlm_get_lock_resource(struct dlm_ctxt *dlm, 855 const char *lockid, 856 int namelen, 857 int flags); 858 struct dlm_lock_resource *dlm_new_lockres(struct dlm_ctxt *dlm, 859 const char *name, 860 unsigned int namelen); 861 862 #define dlm_lockres_set_refmap_bit(bit,res) \ 863 __dlm_lockres_set_refmap_bit(bit,res,__FILE__,__LINE__) 864 #define dlm_lockres_clear_refmap_bit(bit,res) \ 865 __dlm_lockres_clear_refmap_bit(bit,res,__FILE__,__LINE__) 866 867 static inline void __dlm_lockres_set_refmap_bit(int bit, 868 struct dlm_lock_resource *res, 869 const char *file, 870 int line) 871 { 872 //printk("%s:%d:%.*s: setting bit %d\n", file, line, 873 // res->lockname.len, res->lockname.name, bit); 874 set_bit(bit, res->refmap); 875 } 876 877 static inline void __dlm_lockres_clear_refmap_bit(int bit, 878 struct dlm_lock_resource *res, 879 const char *file, 880 int line) 881 { 882 //printk("%s:%d:%.*s: clearing bit %d\n", file, line, 883 // res->lockname.len, res->lockname.name, bit); 884 clear_bit(bit, res->refmap); 885 } 886 887 void __dlm_lockres_drop_inflight_ref(struct dlm_ctxt *dlm, 888 struct dlm_lock_resource *res, 889 const char *file, 890 int line); 891 void __dlm_lockres_grab_inflight_ref(struct dlm_ctxt *dlm, 892 struct dlm_lock_resource *res, 893 int new_lockres, 894 const char *file, 895 int line); 896 #define dlm_lockres_drop_inflight_ref(d,r) \ 897 __dlm_lockres_drop_inflight_ref(d,r,__FILE__,__LINE__) 898 #define dlm_lockres_grab_inflight_ref(d,r) \ 899 __dlm_lockres_grab_inflight_ref(d,r,0,__FILE__,__LINE__) 900 #define dlm_lockres_grab_inflight_ref_new(d,r) \ 901 __dlm_lockres_grab_inflight_ref(d,r,1,__FILE__,__LINE__) 902 903 void dlm_queue_ast(struct dlm_ctxt *dlm, struct dlm_lock *lock); 904 void dlm_queue_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock); 905 void dlm_do_local_ast(struct dlm_ctxt *dlm, 906 struct dlm_lock_resource *res, 907 struct dlm_lock *lock); 908 int dlm_do_remote_ast(struct dlm_ctxt *dlm, 909 struct dlm_lock_resource *res, 910 struct dlm_lock *lock); 911 void dlm_do_local_bast(struct dlm_ctxt *dlm, 912 struct dlm_lock_resource *res, 913 struct dlm_lock *lock, 914 int blocked_type); 915 int dlm_send_proxy_ast_msg(struct dlm_ctxt *dlm, 916 struct dlm_lock_resource *res, 917 struct dlm_lock *lock, 918 int msg_type, 919 int blocked_type, int flags); 920 static inline int dlm_send_proxy_bast(struct dlm_ctxt *dlm, 921 struct dlm_lock_resource *res, 922 struct dlm_lock *lock, 923 int blocked_type) 924 { 925 return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_BAST, 926 blocked_type, 0); 927 } 928 929 static inline int dlm_send_proxy_ast(struct dlm_ctxt *dlm, 930 struct dlm_lock_resource *res, 931 struct dlm_lock *lock, 932 int flags) 933 { 934 return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_AST, 935 0, flags); 936 } 937 938 void dlm_print_one_lock_resource(struct dlm_lock_resource *res); 939 void __dlm_print_one_lock_resource(struct dlm_lock_resource *res); 940 941 u8 dlm_nm_this_node(struct dlm_ctxt *dlm); 942 void dlm_kick_thread(struct dlm_ctxt *dlm, struct dlm_lock_resource *res); 943 void __dlm_dirty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res); 944 945 946 int dlm_nm_init(struct dlm_ctxt *dlm); 947 int dlm_heartbeat_init(struct dlm_ctxt *dlm); 948 void dlm_hb_node_down_cb(struct o2nm_node *node, int idx, void *data); 949 void dlm_hb_node_up_cb(struct o2nm_node *node, int idx, void *data); 950 951 int dlm_empty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res); 952 int dlm_finish_migration(struct dlm_ctxt *dlm, 953 struct dlm_lock_resource *res, 954 u8 old_master); 955 void dlm_lockres_release_ast(struct dlm_ctxt *dlm, 956 struct dlm_lock_resource *res); 957 void __dlm_lockres_reserve_ast(struct dlm_lock_resource *res); 958 959 int dlm_master_request_handler(struct o2net_msg *msg, u32 len, void *data, 960 void **ret_data); 961 int dlm_assert_master_handler(struct o2net_msg *msg, u32 len, void *data, 962 void **ret_data); 963 void dlm_assert_master_post_handler(int status, void *data, void *ret_data); 964 int dlm_deref_lockres_handler(struct o2net_msg *msg, u32 len, void *data, 965 void **ret_data); 966 int dlm_migrate_request_handler(struct o2net_msg *msg, u32 len, void *data, 967 void **ret_data); 968 int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data, 969 void **ret_data); 970 int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data, 971 void **ret_data); 972 int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data, 973 void **ret_data); 974 int dlm_reco_data_done_handler(struct o2net_msg *msg, u32 len, void *data, 975 void **ret_data); 976 int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data, 977 void **ret_data); 978 int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data, 979 void **ret_data); 980 int dlm_do_master_requery(struct dlm_ctxt *dlm, struct dlm_lock_resource *res, 981 u8 nodenum, u8 *real_master); 982 983 984 int dlm_dispatch_assert_master(struct dlm_ctxt *dlm, 985 struct dlm_lock_resource *res, 986 int ignore_higher, 987 u8 request_from, 988 u32 flags); 989 990 991 int dlm_send_one_lockres(struct dlm_ctxt *dlm, 992 struct dlm_lock_resource *res, 993 struct dlm_migratable_lockres *mres, 994 u8 send_to, 995 u8 flags); 996 void dlm_move_lockres_to_recovery_list(struct dlm_ctxt *dlm, 997 struct dlm_lock_resource *res); 998 999 /* will exit holding res->spinlock, but may drop in function */ 1000 void __dlm_wait_on_lockres_flags(struct dlm_lock_resource *res, int flags); 1001 void __dlm_wait_on_lockres_flags_set(struct dlm_lock_resource *res, int flags); 1002 1003 /* will exit holding res->spinlock, but may drop in function */ 1004 static inline void __dlm_wait_on_lockres(struct dlm_lock_resource *res) 1005 { 1006 __dlm_wait_on_lockres_flags(res, (DLM_LOCK_RES_IN_PROGRESS| 1007 DLM_LOCK_RES_RECOVERING| 1008 DLM_LOCK_RES_MIGRATING)); 1009 } 1010 1011 /* create/destroy slab caches */ 1012 int dlm_init_master_caches(void); 1013 void dlm_destroy_master_caches(void); 1014 1015 int dlm_init_lock_cache(void); 1016 void dlm_destroy_lock_cache(void); 1017 1018 int dlm_init_mle_cache(void); 1019 void dlm_destroy_mle_cache(void); 1020 1021 void dlm_hb_event_notify_attached(struct dlm_ctxt *dlm, int idx, int node_up); 1022 int dlm_drop_lockres_ref(struct dlm_ctxt *dlm, 1023 struct dlm_lock_resource *res); 1024 void dlm_clean_master_list(struct dlm_ctxt *dlm, 1025 u8 dead_node); 1026 int dlm_lock_basts_flushed(struct dlm_ctxt *dlm, struct dlm_lock *lock); 1027 int __dlm_lockres_has_locks(struct dlm_lock_resource *res); 1028 int __dlm_lockres_unused(struct dlm_lock_resource *res); 1029 1030 static inline const char * dlm_lock_mode_name(int mode) 1031 { 1032 switch (mode) { 1033 case LKM_EXMODE: 1034 return "EX"; 1035 case LKM_PRMODE: 1036 return "PR"; 1037 case LKM_NLMODE: 1038 return "NL"; 1039 } 1040 return "UNKNOWN"; 1041 } 1042 1043 1044 static inline int dlm_lock_compatible(int existing, int request) 1045 { 1046 /* NO_LOCK compatible with all */ 1047 if (request == LKM_NLMODE || 1048 existing == LKM_NLMODE) 1049 return 1; 1050 1051 /* EX incompatible with all non-NO_LOCK */ 1052 if (request == LKM_EXMODE) 1053 return 0; 1054 1055 /* request must be PR, which is compatible with PR */ 1056 if (existing == LKM_PRMODE) 1057 return 1; 1058 1059 return 0; 1060 } 1061 1062 static inline int dlm_lock_on_list(struct list_head *head, 1063 struct dlm_lock *lock) 1064 { 1065 struct list_head *iter; 1066 struct dlm_lock *tmplock; 1067 1068 list_for_each(iter, head) { 1069 tmplock = list_entry(iter, struct dlm_lock, list); 1070 if (tmplock == lock) 1071 return 1; 1072 } 1073 return 0; 1074 } 1075 1076 1077 static inline enum dlm_status dlm_err_to_dlm_status(int err) 1078 { 1079 enum dlm_status ret; 1080 if (err == -ENOMEM) 1081 ret = DLM_SYSERR; 1082 else if (err == -ETIMEDOUT || o2net_link_down(err, NULL)) 1083 ret = DLM_NOLOCKMGR; 1084 else if (err == -EINVAL) 1085 ret = DLM_BADPARAM; 1086 else if (err == -ENAMETOOLONG) 1087 ret = DLM_IVBUFLEN; 1088 else 1089 ret = DLM_BADARGS; 1090 return ret; 1091 } 1092 1093 1094 static inline void dlm_node_iter_init(unsigned long *map, 1095 struct dlm_node_iter *iter) 1096 { 1097 memcpy(iter->node_map, map, sizeof(iter->node_map)); 1098 iter->curnode = -1; 1099 } 1100 1101 static inline int dlm_node_iter_next(struct dlm_node_iter *iter) 1102 { 1103 int bit; 1104 bit = find_next_bit(iter->node_map, O2NM_MAX_NODES, iter->curnode+1); 1105 if (bit >= O2NM_MAX_NODES) { 1106 iter->curnode = O2NM_MAX_NODES; 1107 return -ENOENT; 1108 } 1109 iter->curnode = bit; 1110 return bit; 1111 } 1112 1113 1114 1115 #endif /* DLMCOMMON_H */ 1116