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