git.oblomov.eu Git - linux-2.6/blob - fs/ocfs2/dlm/dlmcommon.h

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