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_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 */