1 /****************************************************************************** 2 ******************************************************************************* 3 ** 4 ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 5 ** Copyright (C) 2004-2011 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 <linux/idr.h> 41 #include <linux/ratelimit.h> 42 #include <asm/uaccess.h> 43 44 #include <linux/dlm.h> 45 #include "config.h" 46 47 /* Size of the temp buffer midcomms allocates on the stack. 48 We try to make this large enough so most messages fit. 49 FIXME: should sctp make this unnecessary? */ 50 51 #define DLM_INBUF_LEN 148 52 53 struct dlm_ls; 54 struct dlm_lkb; 55 struct dlm_rsb; 56 struct dlm_member; 57 struct dlm_rsbtable; 58 struct dlm_recover; 59 struct dlm_header; 60 struct dlm_message; 61 struct dlm_rcom; 62 struct dlm_mhandle; 63 64 #define log_print(fmt, args...) \ 65 printk(KERN_ERR "dlm: "fmt"\n" , ##args) 66 #define log_error(ls, fmt, args...) \ 67 printk(KERN_ERR "dlm: %s: " fmt "\n", (ls)->ls_name , ##args) 68 69 #define log_rinfo(ls, fmt, args...) \ 70 do { \ 71 if (dlm_config.ci_log_info) \ 72 printk(KERN_INFO "dlm: %s: " fmt "\n", \ 73 (ls)->ls_name, ##args); \ 74 else if (dlm_config.ci_log_debug) \ 75 printk(KERN_DEBUG "dlm: %s: " fmt "\n", \ 76 (ls)->ls_name , ##args); \ 77 } while (0) 78 79 #define log_debug(ls, fmt, args...) \ 80 do { \ 81 if (dlm_config.ci_log_debug) \ 82 printk(KERN_DEBUG "dlm: %s: " fmt "\n", \ 83 (ls)->ls_name , ##args); \ 84 } while (0) 85 86 #define log_limit(ls, fmt, args...) \ 87 do { \ 88 if (dlm_config.ci_log_debug) \ 89 printk_ratelimited(KERN_DEBUG "dlm: %s: " fmt "\n", \ 90 (ls)->ls_name , ##args); \ 91 } while (0) 92 93 #define DLM_ASSERT(x, do) \ 94 { \ 95 if (!(x)) \ 96 { \ 97 printk(KERN_ERR "\nDLM: Assertion failed on line %d of file %s\n" \ 98 "DLM: assertion: \"%s\"\n" \ 99 "DLM: time = %lu\n", \ 100 __LINE__, __FILE__, #x, jiffies); \ 101 {do} \ 102 printk("\n"); \ 103 BUG(); \ 104 panic("DLM: Record message above and reboot.\n"); \ 105 } \ 106 } 107 108 109 #define DLM_RTF_SHRINK 0x00000001 110 111 struct dlm_rsbtable { 112 struct rb_root keep; 113 struct rb_root toss; 114 spinlock_t lock; 115 uint32_t flags; 116 }; 117 118 119 /* 120 * Lockspace member (per node in a ls) 121 */ 122 123 struct dlm_member { 124 struct list_head list; 125 int nodeid; 126 int weight; 127 int slot; 128 int slot_prev; 129 int comm_seq; 130 uint32_t generation; 131 }; 132 133 /* 134 * Save and manage recovery state for a lockspace. 135 */ 136 137 struct dlm_recover { 138 struct list_head list; 139 struct dlm_config_node *nodes; 140 int nodes_count; 141 uint64_t seq; 142 }; 143 144 /* 145 * Pass input args to second stage locking function. 146 */ 147 148 struct dlm_args { 149 uint32_t flags; 150 void (*astfn) (void *astparam); 151 void *astparam; 152 void (*bastfn) (void *astparam, int mode); 153 int mode; 154 struct dlm_lksb *lksb; 155 unsigned long timeout; 156 }; 157 158 159 /* 160 * Lock block 161 * 162 * A lock can be one of three types: 163 * 164 * local copy lock is mastered locally 165 * (lkb_nodeid is zero and DLM_LKF_MSTCPY is not set) 166 * process copy lock is mastered on a remote node 167 * (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is not set) 168 * master copy master node's copy of a lock owned by remote node 169 * (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is set) 170 * 171 * lkb_exflags: a copy of the most recent flags arg provided to dlm_lock or 172 * dlm_unlock. The dlm does not modify these or use any private flags in 173 * this field; it only contains DLM_LKF_ flags from dlm.h. These flags 174 * are sent as-is to the remote master when the lock is remote. 175 * 176 * lkb_flags: internal dlm flags (DLM_IFL_ prefix) from dlm_internal.h. 177 * Some internal flags are shared between the master and process nodes; 178 * these shared flags are kept in the lower two bytes. One of these 179 * flags set on the master copy will be propagated to the process copy 180 * and v.v. Other internal flags are private to the master or process 181 * node (e.g. DLM_IFL_MSTCPY). These are kept in the high two bytes. 182 * 183 * lkb_sbflags: status block flags. These flags are copied directly into 184 * the caller's lksb.sb_flags prior to the dlm_lock/dlm_unlock completion 185 * ast. All defined in dlm.h with DLM_SBF_ prefix. 186 * 187 * lkb_status: the lock status indicates which rsb queue the lock is 188 * on, grant, convert, or wait. DLM_LKSTS_ WAITING/GRANTED/CONVERT 189 * 190 * lkb_wait_type: the dlm message type (DLM_MSG_ prefix) for which a 191 * reply is needed. Only set when the lkb is on the lockspace waiters 192 * list awaiting a reply from a remote node. 193 * 194 * lkb_nodeid: when the lkb is a local copy, nodeid is 0; when the lkb 195 * is a master copy, nodeid specifies the remote lock holder, when the 196 * lkb is a process copy, the nodeid specifies the lock master. 197 */ 198 199 /* lkb_status */ 200 201 #define DLM_LKSTS_WAITING 1 202 #define DLM_LKSTS_GRANTED 2 203 #define DLM_LKSTS_CONVERT 3 204 205 /* lkb_flags */ 206 207 #define DLM_IFL_MSTCPY 0x00010000 208 #define DLM_IFL_RESEND 0x00020000 209 #define DLM_IFL_DEAD 0x00040000 210 #define DLM_IFL_OVERLAP_UNLOCK 0x00080000 211 #define DLM_IFL_OVERLAP_CANCEL 0x00100000 212 #define DLM_IFL_ENDOFLIFE 0x00200000 213 #define DLM_IFL_WATCH_TIMEWARN 0x00400000 214 #define DLM_IFL_TIMEOUT_CANCEL 0x00800000 215 #define DLM_IFL_DEADLOCK_CANCEL 0x01000000 216 #define DLM_IFL_STUB_MS 0x02000000 /* magic number for m_flags */ 217 #define DLM_IFL_USER 0x00000001 218 #define DLM_IFL_ORPHAN 0x00000002 219 220 #define DLM_CALLBACKS_SIZE 6 221 222 #define DLM_CB_CAST 0x00000001 223 #define DLM_CB_BAST 0x00000002 224 #define DLM_CB_SKIP 0x00000004 225 226 struct dlm_callback { 227 uint64_t seq; 228 uint32_t flags; /* DLM_CBF_ */ 229 int sb_status; /* copy to lksb status */ 230 uint8_t sb_flags; /* copy to lksb flags */ 231 int8_t mode; /* rq mode of bast, gr mode of cast */ 232 }; 233 234 struct dlm_lkb { 235 struct dlm_rsb *lkb_resource; /* the rsb */ 236 struct kref lkb_ref; 237 int lkb_nodeid; /* copied from rsb */ 238 int lkb_ownpid; /* pid of lock owner */ 239 uint32_t lkb_id; /* our lock ID */ 240 uint32_t lkb_remid; /* lock ID on remote partner */ 241 uint32_t lkb_exflags; /* external flags from caller */ 242 uint32_t lkb_sbflags; /* lksb flags */ 243 uint32_t lkb_flags; /* internal flags */ 244 uint32_t lkb_lvbseq; /* lvb sequence number */ 245 246 int8_t lkb_status; /* granted, waiting, convert */ 247 int8_t lkb_rqmode; /* requested lock mode */ 248 int8_t lkb_grmode; /* granted lock mode */ 249 int8_t lkb_highbast; /* highest mode bast sent for */ 250 251 int8_t lkb_wait_type; /* type of reply waiting for */ 252 int8_t lkb_wait_count; 253 int lkb_wait_nodeid; /* for debugging */ 254 255 struct list_head lkb_statequeue; /* rsb g/c/w list */ 256 struct list_head lkb_rsb_lookup; /* waiting for rsb lookup */ 257 struct list_head lkb_wait_reply; /* waiting for remote reply */ 258 struct list_head lkb_ownqueue; /* list of locks for a process */ 259 struct list_head lkb_time_list; 260 ktime_t lkb_timestamp; 261 ktime_t lkb_wait_time; 262 unsigned long lkb_timeout_cs; 263 264 struct mutex lkb_cb_mutex; 265 struct work_struct lkb_cb_work; 266 struct list_head lkb_cb_list; /* for ls_cb_delay or proc->asts */ 267 struct dlm_callback lkb_callbacks[DLM_CALLBACKS_SIZE]; 268 struct dlm_callback lkb_last_cast; 269 struct dlm_callback lkb_last_bast; 270 ktime_t lkb_last_cast_time; /* for debugging */ 271 ktime_t lkb_last_bast_time; /* for debugging */ 272 273 uint64_t lkb_recover_seq; /* from ls_recover_seq */ 274 275 char *lkb_lvbptr; 276 struct dlm_lksb *lkb_lksb; /* caller's status block */ 277 void (*lkb_astfn) (void *astparam); 278 void (*lkb_bastfn) (void *astparam, int mode); 279 union { 280 void *lkb_astparam; /* caller's ast arg */ 281 struct dlm_user_args *lkb_ua; 282 }; 283 }; 284 285 /* 286 * res_master_nodeid is "normal": 0 is unset/invalid, non-zero is the real 287 * nodeid, even when nodeid is our_nodeid. 288 * 289 * res_nodeid is "odd": -1 is unset/invalid, zero means our_nodeid, 290 * greater than zero when another nodeid. 291 * 292 * (TODO: remove res_nodeid and only use res_master_nodeid) 293 */ 294 295 struct dlm_rsb { 296 struct dlm_ls *res_ls; /* the lockspace */ 297 struct kref res_ref; 298 struct mutex res_mutex; 299 unsigned long res_flags; 300 int res_length; /* length of rsb name */ 301 int res_nodeid; 302 int res_master_nodeid; 303 int res_dir_nodeid; 304 int res_id; /* for ls_recover_idr */ 305 uint32_t res_lvbseq; 306 uint32_t res_hash; 307 uint32_t res_bucket; /* rsbtbl */ 308 unsigned long res_toss_time; 309 uint32_t res_first_lkid; 310 struct list_head res_lookup; /* lkbs waiting on first */ 311 union { 312 struct list_head res_hashchain; 313 struct rb_node res_hashnode; /* rsbtbl */ 314 }; 315 struct list_head res_grantqueue; 316 struct list_head res_convertqueue; 317 struct list_head res_waitqueue; 318 319 struct list_head res_root_list; /* used for recovery */ 320 struct list_head res_recover_list; /* used for recovery */ 321 int res_recover_locks_count; 322 323 char *res_lvbptr; 324 char res_name[DLM_RESNAME_MAXLEN+1]; 325 }; 326 327 /* dlm_master_lookup() flags */ 328 329 #define DLM_LU_RECOVER_DIR 1 330 #define DLM_LU_RECOVER_MASTER 2 331 332 /* dlm_master_lookup() results */ 333 334 #define DLM_LU_MATCH 1 335 #define DLM_LU_ADD 2 336 337 /* find_rsb() flags */ 338 339 #define R_REQUEST 0x00000001 340 #define R_RECEIVE_REQUEST 0x00000002 341 #define R_RECEIVE_RECOVER 0x00000004 342 343 /* rsb_flags */ 344 345 enum rsb_flags { 346 RSB_MASTER_UNCERTAIN, 347 RSB_VALNOTVALID, 348 RSB_VALNOTVALID_PREV, 349 RSB_NEW_MASTER, 350 RSB_NEW_MASTER2, 351 RSB_RECOVER_CONVERT, 352 RSB_RECOVER_GRANT, 353 RSB_RECOVER_LVB_INVAL, 354 }; 355 356 static inline void rsb_set_flag(struct dlm_rsb *r, enum rsb_flags flag) 357 { 358 __set_bit(flag, &r->res_flags); 359 } 360 361 static inline void rsb_clear_flag(struct dlm_rsb *r, enum rsb_flags flag) 362 { 363 __clear_bit(flag, &r->res_flags); 364 } 365 366 static inline int rsb_flag(struct dlm_rsb *r, enum rsb_flags flag) 367 { 368 return test_bit(flag, &r->res_flags); 369 } 370 371 372 /* dlm_header is first element of all structs sent between nodes */ 373 374 #define DLM_HEADER_MAJOR 0x00030000 375 #define DLM_HEADER_MINOR 0x00000001 376 377 #define DLM_HEADER_SLOTS 0x00000001 378 379 #define DLM_MSG 1 380 #define DLM_RCOM 2 381 382 struct dlm_header { 383 uint32_t h_version; 384 uint32_t h_lockspace; 385 uint32_t h_nodeid; /* nodeid of sender */ 386 uint16_t h_length; 387 uint8_t h_cmd; /* DLM_MSG, DLM_RCOM */ 388 uint8_t h_pad; 389 }; 390 391 392 #define DLM_MSG_REQUEST 1 393 #define DLM_MSG_CONVERT 2 394 #define DLM_MSG_UNLOCK 3 395 #define DLM_MSG_CANCEL 4 396 #define DLM_MSG_REQUEST_REPLY 5 397 #define DLM_MSG_CONVERT_REPLY 6 398 #define DLM_MSG_UNLOCK_REPLY 7 399 #define DLM_MSG_CANCEL_REPLY 8 400 #define DLM_MSG_GRANT 9 401 #define DLM_MSG_BAST 10 402 #define DLM_MSG_LOOKUP 11 403 #define DLM_MSG_REMOVE 12 404 #define DLM_MSG_LOOKUP_REPLY 13 405 #define DLM_MSG_PURGE 14 406 407 struct dlm_message { 408 struct dlm_header m_header; 409 uint32_t m_type; /* DLM_MSG_ */ 410 uint32_t m_nodeid; 411 uint32_t m_pid; 412 uint32_t m_lkid; /* lkid on sender */ 413 uint32_t m_remid; /* lkid on receiver */ 414 uint32_t m_parent_lkid; 415 uint32_t m_parent_remid; 416 uint32_t m_exflags; 417 uint32_t m_sbflags; 418 uint32_t m_flags; 419 uint32_t m_lvbseq; 420 uint32_t m_hash; 421 int m_status; 422 int m_grmode; 423 int m_rqmode; 424 int m_bastmode; 425 int m_asts; 426 int m_result; /* 0 or -EXXX */ 427 char m_extra[0]; /* name or lvb */ 428 }; 429 430 431 #define DLM_RS_NODES 0x00000001 432 #define DLM_RS_NODES_ALL 0x00000002 433 #define DLM_RS_DIR 0x00000004 434 #define DLM_RS_DIR_ALL 0x00000008 435 #define DLM_RS_LOCKS 0x00000010 436 #define DLM_RS_LOCKS_ALL 0x00000020 437 #define DLM_RS_DONE 0x00000040 438 #define DLM_RS_DONE_ALL 0x00000080 439 440 #define DLM_RCOM_STATUS 1 441 #define DLM_RCOM_NAMES 2 442 #define DLM_RCOM_LOOKUP 3 443 #define DLM_RCOM_LOCK 4 444 #define DLM_RCOM_STATUS_REPLY 5 445 #define DLM_RCOM_NAMES_REPLY 6 446 #define DLM_RCOM_LOOKUP_REPLY 7 447 #define DLM_RCOM_LOCK_REPLY 8 448 449 struct dlm_rcom { 450 struct dlm_header rc_header; 451 uint32_t rc_type; /* DLM_RCOM_ */ 452 int rc_result; /* multi-purpose */ 453 uint64_t rc_id; /* match reply with request */ 454 uint64_t rc_seq; /* sender's ls_recover_seq */ 455 uint64_t rc_seq_reply; /* remote ls_recover_seq */ 456 char rc_buf[0]; 457 }; 458 459 union dlm_packet { 460 struct dlm_header header; /* common to other two */ 461 struct dlm_message message; 462 struct dlm_rcom rcom; 463 }; 464 465 #define DLM_RSF_NEED_SLOTS 0x00000001 466 467 /* RCOM_STATUS data */ 468 struct rcom_status { 469 __le32 rs_flags; 470 __le32 rs_unused1; 471 __le64 rs_unused2; 472 }; 473 474 /* RCOM_STATUS_REPLY data */ 475 struct rcom_config { 476 __le32 rf_lvblen; 477 __le32 rf_lsflags; 478 479 /* DLM_HEADER_SLOTS adds: */ 480 __le32 rf_flags; 481 __le16 rf_our_slot; 482 __le16 rf_num_slots; 483 __le32 rf_generation; 484 __le32 rf_unused1; 485 __le64 rf_unused2; 486 }; 487 488 struct rcom_slot { 489 __le32 ro_nodeid; 490 __le16 ro_slot; 491 __le16 ro_unused1; 492 __le64 ro_unused2; 493 }; 494 495 struct rcom_lock { 496 __le32 rl_ownpid; 497 __le32 rl_lkid; 498 __le32 rl_remid; 499 __le32 rl_parent_lkid; 500 __le32 rl_parent_remid; 501 __le32 rl_exflags; 502 __le32 rl_flags; 503 __le32 rl_lvbseq; 504 __le32 rl_result; 505 int8_t rl_rqmode; 506 int8_t rl_grmode; 507 int8_t rl_status; 508 int8_t rl_asts; 509 __le16 rl_wait_type; 510 __le16 rl_namelen; 511 char rl_name[DLM_RESNAME_MAXLEN]; 512 char rl_lvb[0]; 513 }; 514 515 /* 516 * The max number of resources per rsbtbl bucket that shrink will attempt 517 * to remove in each iteration. 518 */ 519 520 #define DLM_REMOVE_NAMES_MAX 8 521 522 struct dlm_ls { 523 struct list_head ls_list; /* list of lockspaces */ 524 dlm_lockspace_t *ls_local_handle; 525 uint32_t ls_global_id; /* global unique lockspace ID */ 526 uint32_t ls_generation; 527 uint32_t ls_exflags; 528 int ls_lvblen; 529 int ls_count; /* refcount of processes in 530 the dlm using this ls */ 531 int ls_create_count; /* create/release refcount */ 532 unsigned long ls_flags; /* LSFL_ */ 533 unsigned long ls_scan_time; 534 struct kobject ls_kobj; 535 536 struct idr ls_lkbidr; 537 spinlock_t ls_lkbidr_spin; 538 539 struct dlm_rsbtable *ls_rsbtbl; 540 uint32_t ls_rsbtbl_size; 541 542 struct mutex ls_waiters_mutex; 543 struct list_head ls_waiters; /* lkbs needing a reply */ 544 545 struct mutex ls_orphans_mutex; 546 struct list_head ls_orphans; 547 548 struct mutex ls_timeout_mutex; 549 struct list_head ls_timeout; 550 551 spinlock_t ls_new_rsb_spin; 552 int ls_new_rsb_count; 553 struct list_head ls_new_rsb; /* new rsb structs */ 554 555 spinlock_t ls_remove_spin; 556 char ls_remove_name[DLM_RESNAME_MAXLEN+1]; 557 char *ls_remove_names[DLM_REMOVE_NAMES_MAX]; 558 int ls_remove_len; 559 int ls_remove_lens[DLM_REMOVE_NAMES_MAX]; 560 561 struct list_head ls_nodes; /* current nodes in ls */ 562 struct list_head ls_nodes_gone; /* dead node list, recovery */ 563 int ls_num_nodes; /* number of nodes in ls */ 564 int ls_low_nodeid; 565 int ls_total_weight; 566 int *ls_node_array; 567 568 int ls_slot; 569 int ls_num_slots; 570 int ls_slots_size; 571 struct dlm_slot *ls_slots; 572 573 struct dlm_rsb ls_stub_rsb; /* for returning errors */ 574 struct dlm_lkb ls_stub_lkb; /* for returning errors */ 575 struct dlm_message ls_stub_ms; /* for faking a reply */ 576 577 struct dentry *ls_debug_rsb_dentry; /* debugfs */ 578 struct dentry *ls_debug_waiters_dentry; /* debugfs */ 579 struct dentry *ls_debug_locks_dentry; /* debugfs */ 580 struct dentry *ls_debug_all_dentry; /* debugfs */ 581 struct dentry *ls_debug_toss_dentry; /* debugfs */ 582 583 wait_queue_head_t ls_uevent_wait; /* user part of join/leave */ 584 int ls_uevent_result; 585 struct completion ls_members_done; 586 int ls_members_result; 587 588 struct miscdevice ls_device; 589 590 struct workqueue_struct *ls_callback_wq; 591 592 /* recovery related */ 593 594 struct mutex ls_cb_mutex; 595 struct list_head ls_cb_delay; /* save for queue_work later */ 596 struct timer_list ls_timer; 597 struct task_struct *ls_recoverd_task; 598 struct mutex ls_recoverd_active; 599 spinlock_t ls_recover_lock; 600 unsigned long ls_recover_begin; /* jiffies timestamp */ 601 uint32_t ls_recover_status; /* DLM_RS_ */ 602 uint64_t ls_recover_seq; 603 struct dlm_recover *ls_recover_args; 604 struct rw_semaphore ls_in_recovery; /* block local requests */ 605 struct rw_semaphore ls_recv_active; /* block dlm_recv */ 606 struct list_head ls_requestqueue;/* queue remote requests */ 607 struct mutex ls_requestqueue_mutex; 608 struct dlm_rcom *ls_recover_buf; 609 int ls_recover_nodeid; /* for debugging */ 610 unsigned int ls_recover_dir_sent_res; /* for log info */ 611 unsigned int ls_recover_dir_sent_msg; /* for log info */ 612 unsigned int ls_recover_locks_in; /* for log info */ 613 uint64_t ls_rcom_seq; 614 spinlock_t ls_rcom_spin; 615 struct list_head ls_recover_list; 616 spinlock_t ls_recover_list_lock; 617 int ls_recover_list_count; 618 struct idr ls_recover_idr; 619 spinlock_t ls_recover_idr_lock; 620 wait_queue_head_t ls_wait_general; 621 wait_queue_head_t ls_recover_lock_wait; 622 struct mutex ls_clear_proc_locks; 623 624 struct list_head ls_root_list; /* root resources */ 625 struct rw_semaphore ls_root_sem; /* protect root_list */ 626 627 const struct dlm_lockspace_ops *ls_ops; 628 void *ls_ops_arg; 629 630 int ls_namelen; 631 char ls_name[1]; 632 }; 633 634 /* 635 * LSFL_RECOVER_STOP - dlm_ls_stop() sets this to tell dlm recovery routines 636 * that they should abort what they're doing so new recovery can be started. 637 * 638 * LSFL_RECOVER_DOWN - dlm_ls_stop() sets this to tell dlm_recoverd that it 639 * should do down_write() on the in_recovery rw_semaphore. (doing down_write 640 * within dlm_ls_stop causes complaints about the lock acquired/released 641 * in different contexts.) 642 * 643 * LSFL_RECOVER_LOCK - dlm_recoverd holds the in_recovery rw_semaphore. 644 * It sets this after it is done with down_write() on the in_recovery 645 * rw_semaphore and clears it after it has released the rw_semaphore. 646 * 647 * LSFL_RECOVER_WORK - dlm_ls_start() sets this to tell dlm_recoverd that it 648 * should begin recovery of the lockspace. 649 * 650 * LSFL_RUNNING - set when normal locking activity is enabled. 651 * dlm_ls_stop() clears this to tell dlm locking routines that they should 652 * quit what they are doing so recovery can run. dlm_recoverd sets 653 * this after recovery is finished. 654 */ 655 656 #define LSFL_RECOVER_STOP 0 657 #define LSFL_RECOVER_DOWN 1 658 #define LSFL_RECOVER_LOCK 2 659 #define LSFL_RECOVER_WORK 3 660 #define LSFL_RUNNING 4 661 662 #define LSFL_RCOM_READY 5 663 #define LSFL_RCOM_WAIT 6 664 #define LSFL_UEVENT_WAIT 7 665 #define LSFL_TIMEWARN 8 666 #define LSFL_CB_DELAY 9 667 #define LSFL_NODIR 10 668 669 /* much of this is just saving user space pointers associated with the 670 lock that we pass back to the user lib with an ast */ 671 672 struct dlm_user_args { 673 struct dlm_user_proc *proc; /* each process that opens the lockspace 674 device has private data 675 (dlm_user_proc) on the struct file, 676 the process's locks point back to it*/ 677 struct dlm_lksb lksb; 678 struct dlm_lksb __user *user_lksb; 679 void __user *castparam; 680 void __user *castaddr; 681 void __user *bastparam; 682 void __user *bastaddr; 683 uint64_t xid; 684 }; 685 686 #define DLM_PROC_FLAGS_CLOSING 1 687 #define DLM_PROC_FLAGS_COMPAT 2 688 689 /* locks list is kept so we can remove all a process's locks when it 690 exits (or orphan those that are persistent) */ 691 692 struct dlm_user_proc { 693 dlm_lockspace_t *lockspace; 694 unsigned long flags; /* DLM_PROC_FLAGS */ 695 struct list_head asts; 696 spinlock_t asts_spin; 697 struct list_head locks; 698 spinlock_t locks_spin; 699 struct list_head unlocking; 700 wait_queue_head_t wait; 701 }; 702 703 static inline int dlm_locking_stopped(struct dlm_ls *ls) 704 { 705 return !test_bit(LSFL_RUNNING, &ls->ls_flags); 706 } 707 708 static inline int dlm_recovery_stopped(struct dlm_ls *ls) 709 { 710 return test_bit(LSFL_RECOVER_STOP, &ls->ls_flags); 711 } 712 713 static inline int dlm_no_directory(struct dlm_ls *ls) 714 { 715 return test_bit(LSFL_NODIR, &ls->ls_flags); 716 } 717 718 int dlm_netlink_init(void); 719 void dlm_netlink_exit(void); 720 void dlm_timeout_warn(struct dlm_lkb *lkb); 721 int dlm_plock_init(void); 722 void dlm_plock_exit(void); 723 724 #ifdef CONFIG_DLM_DEBUG 725 int dlm_register_debugfs(void); 726 void dlm_unregister_debugfs(void); 727 int dlm_create_debug_file(struct dlm_ls *ls); 728 void dlm_delete_debug_file(struct dlm_ls *ls); 729 #else 730 static inline int dlm_register_debugfs(void) { return 0; } 731 static inline void dlm_unregister_debugfs(void) { } 732 static inline int dlm_create_debug_file(struct dlm_ls *ls) { return 0; } 733 static inline void dlm_delete_debug_file(struct dlm_ls *ls) { } 734 #endif 735 736 #endif /* __DLM_INTERNAL_DOT_H__ */ 737 738