1 /****************************************************************************** 2 ******************************************************************************* 3 ** 4 ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 5 ** Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved. 6 ** 7 ** This copyrighted material is made available to anyone wishing to use, 8 ** modify, copy, or redistribute it subject to the terms and conditions 9 ** of the GNU General Public License v.2. 10 ** 11 ******************************************************************************* 12 ******************************************************************************/ 13 14 #ifndef __DLM_INTERNAL_DOT_H__ 15 #define __DLM_INTERNAL_DOT_H__ 16 17 /* 18 * This is the main header file to be included in each DLM source file. 19 */ 20 21 #include <linux/module.h> 22 #include <linux/slab.h> 23 #include <linux/sched.h> 24 #include <linux/types.h> 25 #include <linux/ctype.h> 26 #include <linux/spinlock.h> 27 #include <linux/vmalloc.h> 28 #include <linux/list.h> 29 #include <linux/errno.h> 30 #include <linux/random.h> 31 #include <linux/delay.h> 32 #include <linux/socket.h> 33 #include <linux/kthread.h> 34 #include <linux/kobject.h> 35 #include <linux/kref.h> 36 #include <linux/kernel.h> 37 #include <linux/jhash.h> 38 #include <linux/miscdevice.h> 39 #include <linux/mutex.h> 40 #include <asm/uaccess.h> 41 42 #include <linux/dlm.h> 43 #include "config.h" 44 45 /* Size of the temp buffer midcomms allocates on the stack. 46 We try to make this large enough so most messages fit. 47 FIXME: should sctp make this unnecessary? */ 48 49 #define DLM_INBUF_LEN 148 50 51 struct dlm_ls; 52 struct dlm_lkb; 53 struct dlm_rsb; 54 struct dlm_member; 55 struct dlm_lkbtable; 56 struct dlm_rsbtable; 57 struct dlm_dirtable; 58 struct dlm_direntry; 59 struct dlm_recover; 60 struct dlm_header; 61 struct dlm_message; 62 struct dlm_rcom; 63 struct dlm_mhandle; 64 65 #define log_print(fmt, args...) \ 66 printk(KERN_ERR "dlm: "fmt"\n" , ##args) 67 #define log_error(ls, fmt, args...) \ 68 printk(KERN_ERR "dlm: %s: " fmt "\n", (ls)->ls_name , ##args) 69 70 #define log_debug(ls, fmt, args...) \ 71 do { \ 72 if (dlm_config.ci_log_debug) \ 73 printk(KERN_DEBUG "dlm: %s: " fmt "\n", \ 74 (ls)->ls_name , ##args); \ 75 } while (0) 76 77 #define DLM_ASSERT(x, do) \ 78 { \ 79 if (!(x)) \ 80 { \ 81 printk(KERN_ERR "\nDLM: Assertion failed on line %d of file %s\n" \ 82 "DLM: assertion: \"%s\"\n" \ 83 "DLM: time = %lu\n", \ 84 __LINE__, __FILE__, #x, jiffies); \ 85 {do} \ 86 printk("\n"); \ 87 BUG(); \ 88 panic("DLM: Record message above and reboot.\n"); \ 89 } \ 90 } 91 92 93 struct dlm_direntry { 94 struct list_head list; 95 uint32_t master_nodeid; 96 uint16_t length; 97 char name[1]; 98 }; 99 100 struct dlm_dirtable { 101 struct list_head list; 102 rwlock_t lock; 103 }; 104 105 struct dlm_rsbtable { 106 struct list_head list; 107 struct list_head toss; 108 rwlock_t lock; 109 }; 110 111 struct dlm_lkbtable { 112 struct list_head list; 113 rwlock_t lock; 114 uint16_t counter; 115 }; 116 117 /* 118 * Lockspace member (per node in a ls) 119 */ 120 121 struct dlm_member { 122 struct list_head list; 123 int nodeid; 124 int weight; 125 }; 126 127 /* 128 * Save and manage recovery state for a lockspace. 129 */ 130 131 struct dlm_recover { 132 struct list_head list; 133 int *nodeids; /* nodeids of all members */ 134 int node_count; 135 int *new; /* nodeids of new members */ 136 int new_count; 137 uint64_t seq; 138 }; 139 140 /* 141 * Pass input args to second stage locking function. 142 */ 143 144 struct dlm_args { 145 uint32_t flags; 146 void (*astfn) (void *astparam); 147 void *astparam; 148 void (*bastfn) (void *astparam, int mode); 149 int mode; 150 struct dlm_lksb *lksb; 151 unsigned long timeout; 152 }; 153 154 155 /* 156 * Lock block 157 * 158 * A lock can be one of three types: 159 * 160 * local copy lock is mastered locally 161 * (lkb_nodeid is zero and DLM_LKF_MSTCPY is not set) 162 * process copy lock is mastered on a remote node 163 * (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is not set) 164 * master copy master node's copy of a lock owned by remote node 165 * (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is set) 166 * 167 * lkb_exflags: a copy of the most recent flags arg provided to dlm_lock or 168 * dlm_unlock. The dlm does not modify these or use any private flags in 169 * this field; it only contains DLM_LKF_ flags from dlm.h. These flags 170 * are sent as-is to the remote master when the lock is remote. 171 * 172 * lkb_flags: internal dlm flags (DLM_IFL_ prefix) from dlm_internal.h. 173 * Some internal flags are shared between the master and process nodes; 174 * these shared flags are kept in the lower two bytes. One of these 175 * flags set on the master copy will be propagated to the process copy 176 * and v.v. Other internal flags are private to the master or process 177 * node (e.g. DLM_IFL_MSTCPY). These are kept in the high two bytes. 178 * 179 * lkb_sbflags: status block flags. These flags are copied directly into 180 * the caller's lksb.sb_flags prior to the dlm_lock/dlm_unlock completion 181 * ast. All defined in dlm.h with DLM_SBF_ prefix. 182 * 183 * lkb_status: the lock status indicates which rsb queue the lock is 184 * on, grant, convert, or wait. DLM_LKSTS_ WAITING/GRANTED/CONVERT 185 * 186 * lkb_wait_type: the dlm message type (DLM_MSG_ prefix) for which a 187 * reply is needed. Only set when the lkb is on the lockspace waiters 188 * list awaiting a reply from a remote node. 189 * 190 * lkb_nodeid: when the lkb is a local copy, nodeid is 0; when the lkb 191 * is a master copy, nodeid specifies the remote lock holder, when the 192 * lkb is a process copy, the nodeid specifies the lock master. 193 */ 194 195 /* lkb_ast_type */ 196 197 #define AST_COMP 1 198 #define AST_BAST 2 199 200 /* lkb_status */ 201 202 #define DLM_LKSTS_WAITING 1 203 #define DLM_LKSTS_GRANTED 2 204 #define DLM_LKSTS_CONVERT 3 205 206 /* lkb_flags */ 207 208 #define DLM_IFL_MSTCPY 0x00010000 209 #define DLM_IFL_RESEND 0x00020000 210 #define DLM_IFL_DEAD 0x00040000 211 #define DLM_IFL_OVERLAP_UNLOCK 0x00080000 212 #define DLM_IFL_OVERLAP_CANCEL 0x00100000 213 #define DLM_IFL_ENDOFLIFE 0x00200000 214 #define DLM_IFL_WATCH_TIMEWARN 0x00400000 215 #define DLM_IFL_TIMEOUT_CANCEL 0x00800000 216 #define DLM_IFL_DEADLOCK_CANCEL 0x01000000 217 #define DLM_IFL_USER 0x00000001 218 #define DLM_IFL_ORPHAN 0x00000002 219 220 struct dlm_lkb { 221 struct dlm_rsb *lkb_resource; /* the rsb */ 222 struct kref lkb_ref; 223 int lkb_nodeid; /* copied from rsb */ 224 int lkb_ownpid; /* pid of lock owner */ 225 uint32_t lkb_id; /* our lock ID */ 226 uint32_t lkb_remid; /* lock ID on remote partner */ 227 uint32_t lkb_exflags; /* external flags from caller */ 228 uint32_t lkb_sbflags; /* lksb flags */ 229 uint32_t lkb_flags; /* internal flags */ 230 uint32_t lkb_lvbseq; /* lvb sequence number */ 231 232 int8_t lkb_status; /* granted, waiting, convert */ 233 int8_t lkb_rqmode; /* requested lock mode */ 234 int8_t lkb_grmode; /* granted lock mode */ 235 int8_t lkb_bastmode; /* requested mode */ 236 int8_t lkb_highbast; /* highest mode bast sent for */ 237 int8_t lkb_wait_type; /* type of reply waiting for */ 238 int8_t lkb_wait_count; 239 int8_t lkb_ast_type; /* type of ast queued for */ 240 241 struct list_head lkb_idtbl_list; /* lockspace lkbtbl */ 242 struct list_head lkb_statequeue; /* rsb g/c/w list */ 243 struct list_head lkb_rsb_lookup; /* waiting for rsb lookup */ 244 struct list_head lkb_wait_reply; /* waiting for remote reply */ 245 struct list_head lkb_astqueue; /* need ast to be sent */ 246 struct list_head lkb_ownqueue; /* list of locks for a process */ 247 struct list_head lkb_time_list; 248 unsigned long lkb_timestamp; 249 unsigned long lkb_timeout_cs; 250 251 char *lkb_lvbptr; 252 struct dlm_lksb *lkb_lksb; /* caller's status block */ 253 void (*lkb_astfn) (void *astparam); 254 void (*lkb_bastfn) (void *astparam, int mode); 255 union { 256 void *lkb_astparam; /* caller's ast arg */ 257 struct dlm_user_args *lkb_ua; 258 }; 259 }; 260 261 262 struct dlm_rsb { 263 struct dlm_ls *res_ls; /* the lockspace */ 264 struct kref res_ref; 265 struct mutex res_mutex; 266 unsigned long res_flags; 267 int res_length; /* length of rsb name */ 268 int res_nodeid; 269 uint32_t res_lvbseq; 270 uint32_t res_hash; 271 uint32_t res_bucket; /* rsbtbl */ 272 unsigned long res_toss_time; 273 uint32_t res_first_lkid; 274 struct list_head res_lookup; /* lkbs waiting on first */ 275 struct list_head res_hashchain; /* rsbtbl */ 276 struct list_head res_grantqueue; 277 struct list_head res_convertqueue; 278 struct list_head res_waitqueue; 279 280 struct list_head res_root_list; /* used for recovery */ 281 struct list_head res_recover_list; /* used for recovery */ 282 int res_recover_locks_count; 283 284 char *res_lvbptr; 285 char res_name[1]; 286 }; 287 288 /* find_rsb() flags */ 289 290 #define R_MASTER 1 /* only return rsb if it's a master */ 291 #define R_CREATE 2 /* create/add rsb if not found */ 292 293 /* rsb_flags */ 294 295 enum rsb_flags { 296 RSB_MASTER_UNCERTAIN, 297 RSB_VALNOTVALID, 298 RSB_VALNOTVALID_PREV, 299 RSB_NEW_MASTER, 300 RSB_NEW_MASTER2, 301 RSB_RECOVER_CONVERT, 302 RSB_LOCKS_PURGED, 303 }; 304 305 static inline void rsb_set_flag(struct dlm_rsb *r, enum rsb_flags flag) 306 { 307 __set_bit(flag, &r->res_flags); 308 } 309 310 static inline void rsb_clear_flag(struct dlm_rsb *r, enum rsb_flags flag) 311 { 312 __clear_bit(flag, &r->res_flags); 313 } 314 315 static inline int rsb_flag(struct dlm_rsb *r, enum rsb_flags flag) 316 { 317 return test_bit(flag, &r->res_flags); 318 } 319 320 321 /* dlm_header is first element of all structs sent between nodes */ 322 323 #define DLM_HEADER_MAJOR 0x00030000 324 #define DLM_HEADER_MINOR 0x00000000 325 326 #define DLM_MSG 1 327 #define DLM_RCOM 2 328 329 struct dlm_header { 330 uint32_t h_version; 331 uint32_t h_lockspace; 332 uint32_t h_nodeid; /* nodeid of sender */ 333 uint16_t h_length; 334 uint8_t h_cmd; /* DLM_MSG, DLM_RCOM */ 335 uint8_t h_pad; 336 }; 337 338 339 #define DLM_MSG_REQUEST 1 340 #define DLM_MSG_CONVERT 2 341 #define DLM_MSG_UNLOCK 3 342 #define DLM_MSG_CANCEL 4 343 #define DLM_MSG_REQUEST_REPLY 5 344 #define DLM_MSG_CONVERT_REPLY 6 345 #define DLM_MSG_UNLOCK_REPLY 7 346 #define DLM_MSG_CANCEL_REPLY 8 347 #define DLM_MSG_GRANT 9 348 #define DLM_MSG_BAST 10 349 #define DLM_MSG_LOOKUP 11 350 #define DLM_MSG_REMOVE 12 351 #define DLM_MSG_LOOKUP_REPLY 13 352 #define DLM_MSG_PURGE 14 353 354 struct dlm_message { 355 struct dlm_header m_header; 356 uint32_t m_type; /* DLM_MSG_ */ 357 uint32_t m_nodeid; 358 uint32_t m_pid; 359 uint32_t m_lkid; /* lkid on sender */ 360 uint32_t m_remid; /* lkid on receiver */ 361 uint32_t m_parent_lkid; 362 uint32_t m_parent_remid; 363 uint32_t m_exflags; 364 uint32_t m_sbflags; 365 uint32_t m_flags; 366 uint32_t m_lvbseq; 367 uint32_t m_hash; 368 int m_status; 369 int m_grmode; 370 int m_rqmode; 371 int m_bastmode; 372 int m_asts; 373 int m_result; /* 0 or -EXXX */ 374 char m_extra[0]; /* name or lvb */ 375 }; 376 377 378 #define DLM_RS_NODES 0x00000001 379 #define DLM_RS_NODES_ALL 0x00000002 380 #define DLM_RS_DIR 0x00000004 381 #define DLM_RS_DIR_ALL 0x00000008 382 #define DLM_RS_LOCKS 0x00000010 383 #define DLM_RS_LOCKS_ALL 0x00000020 384 #define DLM_RS_DONE 0x00000040 385 #define DLM_RS_DONE_ALL 0x00000080 386 387 #define DLM_RCOM_STATUS 1 388 #define DLM_RCOM_NAMES 2 389 #define DLM_RCOM_LOOKUP 3 390 #define DLM_RCOM_LOCK 4 391 #define DLM_RCOM_STATUS_REPLY 5 392 #define DLM_RCOM_NAMES_REPLY 6 393 #define DLM_RCOM_LOOKUP_REPLY 7 394 #define DLM_RCOM_LOCK_REPLY 8 395 396 struct dlm_rcom { 397 struct dlm_header rc_header; 398 uint32_t rc_type; /* DLM_RCOM_ */ 399 int rc_result; /* multi-purpose */ 400 uint64_t rc_id; /* match reply with request */ 401 uint64_t rc_seq; /* sender's ls_recover_seq */ 402 uint64_t rc_seq_reply; /* remote ls_recover_seq */ 403 char rc_buf[0]; 404 }; 405 406 union dlm_packet { 407 struct dlm_header header; /* common to other two */ 408 struct dlm_message message; 409 struct dlm_rcom rcom; 410 }; 411 412 struct rcom_config { 413 __le32 rf_lvblen; 414 __le32 rf_lsflags; 415 __le64 rf_unused; 416 }; 417 418 struct rcom_lock { 419 __le32 rl_ownpid; 420 __le32 rl_lkid; 421 __le32 rl_remid; 422 __le32 rl_parent_lkid; 423 __le32 rl_parent_remid; 424 __le32 rl_exflags; 425 __le32 rl_flags; 426 __le32 rl_lvbseq; 427 __le32 rl_result; 428 int8_t rl_rqmode; 429 int8_t rl_grmode; 430 int8_t rl_status; 431 int8_t rl_asts; 432 __le16 rl_wait_type; 433 __le16 rl_namelen; 434 char rl_name[DLM_RESNAME_MAXLEN]; 435 char rl_lvb[0]; 436 }; 437 438 struct dlm_ls { 439 struct list_head ls_list; /* list of lockspaces */ 440 dlm_lockspace_t *ls_local_handle; 441 uint32_t ls_global_id; /* global unique lockspace ID */ 442 uint32_t ls_exflags; 443 int ls_lvblen; 444 int ls_count; /* reference count */ 445 unsigned long ls_flags; /* LSFL_ */ 446 struct kobject ls_kobj; 447 448 struct dlm_rsbtable *ls_rsbtbl; 449 uint32_t ls_rsbtbl_size; 450 451 struct dlm_lkbtable *ls_lkbtbl; 452 uint32_t ls_lkbtbl_size; 453 454 struct dlm_dirtable *ls_dirtbl; 455 uint32_t ls_dirtbl_size; 456 457 struct mutex ls_waiters_mutex; 458 struct list_head ls_waiters; /* lkbs needing a reply */ 459 460 struct mutex ls_orphans_mutex; 461 struct list_head ls_orphans; 462 463 struct mutex ls_timeout_mutex; 464 struct list_head ls_timeout; 465 466 struct list_head ls_nodes; /* current nodes in ls */ 467 struct list_head ls_nodes_gone; /* dead node list, recovery */ 468 int ls_num_nodes; /* number of nodes in ls */ 469 int ls_low_nodeid; 470 int ls_total_weight; 471 int *ls_node_array; 472 gfp_t ls_allocation; 473 474 struct dlm_rsb ls_stub_rsb; /* for returning errors */ 475 struct dlm_lkb ls_stub_lkb; /* for returning errors */ 476 struct dlm_message ls_stub_ms; /* for faking a reply */ 477 478 struct dentry *ls_debug_rsb_dentry; /* debugfs */ 479 struct dentry *ls_debug_waiters_dentry; /* debugfs */ 480 struct dentry *ls_debug_locks_dentry; /* debugfs */ 481 482 wait_queue_head_t ls_uevent_wait; /* user part of join/leave */ 483 int ls_uevent_result; 484 struct completion ls_members_done; 485 int ls_members_result; 486 487 struct miscdevice ls_device; 488 489 /* recovery related */ 490 491 struct timer_list ls_timer; 492 struct task_struct *ls_recoverd_task; 493 struct mutex ls_recoverd_active; 494 spinlock_t ls_recover_lock; 495 unsigned long ls_recover_begin; /* jiffies timestamp */ 496 uint32_t ls_recover_status; /* DLM_RS_ */ 497 uint64_t ls_recover_seq; 498 struct dlm_recover *ls_recover_args; 499 struct rw_semaphore ls_in_recovery; /* block local requests */ 500 struct rw_semaphore ls_recv_active; /* block dlm_recv */ 501 struct list_head ls_requestqueue;/* queue remote requests */ 502 struct mutex ls_requestqueue_mutex; 503 struct dlm_rcom *ls_recover_buf; 504 int ls_recover_nodeid; /* for debugging */ 505 uint64_t ls_rcom_seq; 506 spinlock_t ls_rcom_spin; 507 struct list_head ls_recover_list; 508 spinlock_t ls_recover_list_lock; 509 int ls_recover_list_count; 510 wait_queue_head_t ls_wait_general; 511 struct mutex ls_clear_proc_locks; 512 513 struct list_head ls_root_list; /* root resources */ 514 struct rw_semaphore ls_root_sem; /* protect root_list */ 515 516 int ls_namelen; 517 char ls_name[1]; 518 }; 519 520 #define LSFL_WORK 0 521 #define LSFL_RUNNING 1 522 #define LSFL_RECOVERY_STOP 2 523 #define LSFL_RCOM_READY 3 524 #define LSFL_RCOM_WAIT 4 525 #define LSFL_UEVENT_WAIT 5 526 #define LSFL_TIMEWARN 6 527 528 /* much of this is just saving user space pointers associated with the 529 lock that we pass back to the user lib with an ast */ 530 531 struct dlm_user_args { 532 struct dlm_user_proc *proc; /* each process that opens the lockspace 533 device has private data 534 (dlm_user_proc) on the struct file, 535 the process's locks point back to it*/ 536 struct dlm_lksb lksb; 537 int old_mode; 538 int update_user_lvb; 539 struct dlm_lksb __user *user_lksb; 540 void __user *castparam; 541 void __user *castaddr; 542 void __user *bastparam; 543 void __user *bastaddr; 544 uint64_t xid; 545 }; 546 547 #define DLM_PROC_FLAGS_CLOSING 1 548 #define DLM_PROC_FLAGS_COMPAT 2 549 550 /* locks list is kept so we can remove all a process's locks when it 551 exits (or orphan those that are persistent) */ 552 553 struct dlm_user_proc { 554 dlm_lockspace_t *lockspace; 555 unsigned long flags; /* DLM_PROC_FLAGS */ 556 struct list_head asts; 557 spinlock_t asts_spin; 558 struct list_head locks; 559 spinlock_t locks_spin; 560 struct list_head unlocking; 561 wait_queue_head_t wait; 562 }; 563 564 static inline int dlm_locking_stopped(struct dlm_ls *ls) 565 { 566 return !test_bit(LSFL_RUNNING, &ls->ls_flags); 567 } 568 569 static inline int dlm_recovery_stopped(struct dlm_ls *ls) 570 { 571 return test_bit(LSFL_RECOVERY_STOP, &ls->ls_flags); 572 } 573 574 static inline int dlm_no_directory(struct dlm_ls *ls) 575 { 576 return (ls->ls_exflags & DLM_LSFL_NODIR) ? 1 : 0; 577 } 578 579 int dlm_netlink_init(void); 580 void dlm_netlink_exit(void); 581 void dlm_timeout_warn(struct dlm_lkb *lkb); 582 int dlm_plock_init(void); 583 void dlm_plock_exit(void); 584 585 #ifdef CONFIG_DLM_DEBUG 586 int dlm_register_debugfs(void); 587 void dlm_unregister_debugfs(void); 588 int dlm_create_debug_file(struct dlm_ls *ls); 589 void dlm_delete_debug_file(struct dlm_ls *ls); 590 #else 591 static inline int dlm_register_debugfs(void) { return 0; } 592 static inline void dlm_unregister_debugfs(void) { } 593 static inline int dlm_create_debug_file(struct dlm_ls *ls) { return 0; } 594 static inline void dlm_delete_debug_file(struct dlm_ls *ls) { } 595 #endif 596 597 #endif /* __DLM_INTERNAL_DOT_H__ */ 598 599