1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /****************************************************************************** 3 ******************************************************************************* 4 ** 5 ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 6 ** Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved. 7 ** 8 ** 9 ******************************************************************************* 10 ******************************************************************************/ 11 12 #ifndef __DLM_INTERNAL_DOT_H__ 13 #define __DLM_INTERNAL_DOT_H__ 14 15 /* 16 * This is the main header file to be included in each DLM source file. 17 */ 18 19 #include <linux/slab.h> 20 #include <linux/sched.h> 21 #include <linux/types.h> 22 #include <linux/ctype.h> 23 #include <linux/spinlock.h> 24 #include <linux/vmalloc.h> 25 #include <linux/list.h> 26 #include <linux/errno.h> 27 #include <linux/random.h> 28 #include <linux/delay.h> 29 #include <linux/socket.h> 30 #include <linux/kthread.h> 31 #include <linux/kobject.h> 32 #include <linux/kref.h> 33 #include <linux/kernel.h> 34 #include <linux/jhash.h> 35 #include <linux/miscdevice.h> 36 #include <linux/mutex.h> 37 #include <linux/idr.h> 38 #include <linux/ratelimit.h> 39 #include <linux/uaccess.h> 40 41 #include <linux/dlm.h> 42 #include "config.h" 43 44 struct dlm_ls; 45 struct dlm_lkb; 46 struct dlm_rsb; 47 struct dlm_member; 48 struct dlm_rsbtable; 49 struct dlm_recover; 50 struct dlm_header; 51 struct dlm_message; 52 struct dlm_rcom; 53 struct dlm_mhandle; 54 struct dlm_msg; 55 56 #define log_print(fmt, args...) \ 57 printk(KERN_ERR "dlm: "fmt"\n" , ##args) 58 #define log_print_ratelimited(fmt, args...) \ 59 printk_ratelimited(KERN_ERR "dlm: "fmt"\n", ##args) 60 #define log_error(ls, fmt, args...) \ 61 printk(KERN_ERR "dlm: %s: " fmt "\n", (ls)->ls_name , ##args) 62 63 #define log_rinfo(ls, fmt, args...) \ 64 do { \ 65 if (dlm_config.ci_log_info) \ 66 printk(KERN_INFO "dlm: %s: " fmt "\n", \ 67 (ls)->ls_name, ##args); \ 68 else if (dlm_config.ci_log_debug) \ 69 printk(KERN_DEBUG "dlm: %s: " fmt "\n", \ 70 (ls)->ls_name , ##args); \ 71 } while (0) 72 73 #define log_debug(ls, fmt, args...) \ 74 do { \ 75 if (dlm_config.ci_log_debug) \ 76 printk(KERN_DEBUG "dlm: %s: " fmt "\n", \ 77 (ls)->ls_name , ##args); \ 78 } while (0) 79 80 #define log_limit(ls, fmt, args...) \ 81 do { \ 82 if (dlm_config.ci_log_debug) \ 83 printk_ratelimited(KERN_DEBUG "dlm: %s: " fmt "\n", \ 84 (ls)->ls_name , ##args); \ 85 } while (0) 86 87 #define DLM_ASSERT(x, do) \ 88 { \ 89 if (!(x)) \ 90 { \ 91 printk(KERN_ERR "\nDLM: Assertion failed on line %d of file %s\n" \ 92 "DLM: assertion: \"%s\"\n" \ 93 "DLM: time = %lu\n", \ 94 __LINE__, __FILE__, #x, jiffies); \ 95 {do} \ 96 printk("\n"); \ 97 panic("DLM: Record message above and reboot.\n"); \ 98 } \ 99 } 100 101 102 #define DLM_RTF_SHRINK 0x00000001 103 104 struct dlm_rsbtable { 105 struct rb_root keep; 106 struct rb_root toss; 107 spinlock_t lock; 108 uint32_t flags; 109 }; 110 111 112 /* 113 * Lockspace member (per node in a ls) 114 */ 115 116 struct dlm_member { 117 struct list_head list; 118 int nodeid; 119 int weight; 120 int slot; 121 int slot_prev; 122 int comm_seq; 123 uint32_t generation; 124 }; 125 126 /* 127 * Save and manage recovery state for a lockspace. 128 */ 129 130 struct dlm_recover { 131 struct list_head list; 132 struct dlm_config_node *nodes; 133 int nodes_count; 134 uint64_t seq; 135 }; 136 137 /* 138 * Pass input args to second stage locking function. 139 */ 140 141 struct dlm_args { 142 uint32_t flags; 143 void (*astfn) (void *astparam); 144 void *astparam; 145 void (*bastfn) (void *astparam, int mode); 146 int mode; 147 struct dlm_lksb *lksb; 148 unsigned long timeout; 149 }; 150 151 152 /* 153 * Lock block 154 * 155 * A lock can be one of three types: 156 * 157 * local copy lock is mastered locally 158 * (lkb_nodeid is zero and DLM_LKF_MSTCPY is not set) 159 * process copy lock is mastered on a remote node 160 * (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is not set) 161 * master copy master node's copy of a lock owned by remote node 162 * (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is set) 163 * 164 * lkb_exflags: a copy of the most recent flags arg provided to dlm_lock or 165 * dlm_unlock. The dlm does not modify these or use any private flags in 166 * this field; it only contains DLM_LKF_ flags from dlm.h. These flags 167 * are sent as-is to the remote master when the lock is remote. 168 * 169 * lkb_flags: internal dlm flags (DLM_IFL_ prefix) from dlm_internal.h. 170 * Some internal flags are shared between the master and process nodes; 171 * these shared flags are kept in the lower two bytes. One of these 172 * flags set on the master copy will be propagated to the process copy 173 * and v.v. Other internal flags are private to the master or process 174 * node (e.g. DLM_IFL_MSTCPY). These are kept in the high two bytes. 175 * 176 * lkb_sbflags: status block flags. These flags are copied directly into 177 * the caller's lksb.sb_flags prior to the dlm_lock/dlm_unlock completion 178 * ast. All defined in dlm.h with DLM_SBF_ prefix. 179 * 180 * lkb_status: the lock status indicates which rsb queue the lock is 181 * on, grant, convert, or wait. DLM_LKSTS_ WAITING/GRANTED/CONVERT 182 * 183 * lkb_wait_type: the dlm message type (DLM_MSG_ prefix) for which a 184 * reply is needed. Only set when the lkb is on the lockspace waiters 185 * list awaiting a reply from a remote node. 186 * 187 * lkb_nodeid: when the lkb is a local copy, nodeid is 0; when the lkb 188 * is a master copy, nodeid specifies the remote lock holder, when the 189 * lkb is a process copy, the nodeid specifies the lock master. 190 */ 191 192 /* lkb_status */ 193 194 #define DLM_LKSTS_WAITING 1 195 #define DLM_LKSTS_GRANTED 2 196 #define DLM_LKSTS_CONVERT 3 197 198 /* lkb_flags */ 199 200 #define DLM_IFL_MSTCPY 0x00010000 201 #define DLM_IFL_RESEND 0x00020000 202 #define DLM_IFL_DEAD 0x00040000 203 #define DLM_IFL_OVERLAP_UNLOCK 0x00080000 204 #define DLM_IFL_OVERLAP_CANCEL 0x00100000 205 #define DLM_IFL_ENDOFLIFE 0x00200000 206 #define DLM_IFL_WATCH_TIMEWARN 0x00400000 207 #define DLM_IFL_TIMEOUT_CANCEL 0x00800000 208 #define DLM_IFL_DEADLOCK_CANCEL 0x01000000 209 #define DLM_IFL_STUB_MS 0x02000000 /* magic number for m_flags */ 210 #define DLM_IFL_USER 0x00000001 211 #define DLM_IFL_ORPHAN 0x00000002 212 213 #define DLM_CALLBACKS_SIZE 6 214 215 #define DLM_CB_CAST 0x00000001 216 #define DLM_CB_BAST 0x00000002 217 #define DLM_CB_SKIP 0x00000004 218 219 struct dlm_callback { 220 uint64_t seq; 221 uint32_t flags; /* DLM_CBF_ */ 222 int sb_status; /* copy to lksb status */ 223 uint8_t sb_flags; /* copy to lksb flags */ 224 int8_t mode; /* rq mode of bast, gr mode of cast */ 225 }; 226 227 struct dlm_lkb { 228 struct dlm_rsb *lkb_resource; /* the rsb */ 229 struct kref lkb_ref; 230 int lkb_nodeid; /* copied from rsb */ 231 int lkb_ownpid; /* pid of lock owner */ 232 uint32_t lkb_id; /* our lock ID */ 233 uint32_t lkb_remid; /* lock ID on remote partner */ 234 uint32_t lkb_exflags; /* external flags from caller */ 235 uint32_t lkb_sbflags; /* lksb flags */ 236 uint32_t lkb_flags; /* internal flags */ 237 uint32_t lkb_lvbseq; /* lvb sequence number */ 238 239 int8_t lkb_status; /* granted, waiting, convert */ 240 int8_t lkb_rqmode; /* requested lock mode */ 241 int8_t lkb_grmode; /* granted lock mode */ 242 int8_t lkb_highbast; /* highest mode bast sent for */ 243 244 int8_t lkb_wait_type; /* type of reply waiting for */ 245 int8_t lkb_wait_count; 246 int lkb_wait_nodeid; /* for debugging */ 247 248 struct list_head lkb_statequeue; /* rsb g/c/w list */ 249 struct list_head lkb_rsb_lookup; /* waiting for rsb lookup */ 250 struct list_head lkb_wait_reply; /* waiting for remote reply */ 251 struct list_head lkb_ownqueue; /* list of locks for a process */ 252 struct list_head lkb_time_list; 253 ktime_t lkb_timestamp; 254 ktime_t lkb_wait_time; 255 unsigned long lkb_timeout_cs; 256 257 struct mutex lkb_cb_mutex; 258 struct work_struct lkb_cb_work; 259 struct list_head lkb_cb_list; /* for ls_cb_delay or proc->asts */ 260 struct dlm_callback lkb_callbacks[DLM_CALLBACKS_SIZE]; 261 struct dlm_callback lkb_last_cast; 262 struct dlm_callback lkb_last_bast; 263 ktime_t lkb_last_cast_time; /* for debugging */ 264 ktime_t lkb_last_bast_time; /* for debugging */ 265 266 uint64_t lkb_recover_seq; /* from ls_recover_seq */ 267 268 char *lkb_lvbptr; 269 struct dlm_lksb *lkb_lksb; /* caller's status block */ 270 void (*lkb_astfn) (void *astparam); 271 void (*lkb_bastfn) (void *astparam, int mode); 272 union { 273 void *lkb_astparam; /* caller's ast arg */ 274 struct dlm_user_args *lkb_ua; 275 }; 276 }; 277 278 /* 279 * res_master_nodeid is "normal": 0 is unset/invalid, non-zero is the real 280 * nodeid, even when nodeid is our_nodeid. 281 * 282 * res_nodeid is "odd": -1 is unset/invalid, zero means our_nodeid, 283 * greater than zero when another nodeid. 284 * 285 * (TODO: remove res_nodeid and only use res_master_nodeid) 286 */ 287 288 struct dlm_rsb { 289 struct dlm_ls *res_ls; /* the lockspace */ 290 struct kref res_ref; 291 struct mutex res_mutex; 292 unsigned long res_flags; 293 int res_length; /* length of rsb name */ 294 int res_nodeid; 295 int res_master_nodeid; 296 int res_dir_nodeid; 297 int res_id; /* for ls_recover_idr */ 298 uint32_t res_lvbseq; 299 uint32_t res_hash; 300 uint32_t res_bucket; /* rsbtbl */ 301 unsigned long res_toss_time; 302 uint32_t res_first_lkid; 303 struct list_head res_lookup; /* lkbs waiting on first */ 304 union { 305 struct list_head res_hashchain; 306 struct rb_node res_hashnode; /* rsbtbl */ 307 }; 308 struct list_head res_grantqueue; 309 struct list_head res_convertqueue; 310 struct list_head res_waitqueue; 311 312 struct list_head res_root_list; /* used for recovery */ 313 struct list_head res_recover_list; /* used for recovery */ 314 int res_recover_locks_count; 315 316 char *res_lvbptr; 317 char res_name[DLM_RESNAME_MAXLEN+1]; 318 }; 319 320 /* dlm_master_lookup() flags */ 321 322 #define DLM_LU_RECOVER_DIR 1 323 #define DLM_LU_RECOVER_MASTER 2 324 325 /* dlm_master_lookup() results */ 326 327 #define DLM_LU_MATCH 1 328 #define DLM_LU_ADD 2 329 330 /* find_rsb() flags */ 331 332 #define R_REQUEST 0x00000001 333 #define R_RECEIVE_REQUEST 0x00000002 334 #define R_RECEIVE_RECOVER 0x00000004 335 336 /* rsb_flags */ 337 338 enum rsb_flags { 339 RSB_MASTER_UNCERTAIN, 340 RSB_VALNOTVALID, 341 RSB_VALNOTVALID_PREV, 342 RSB_NEW_MASTER, 343 RSB_NEW_MASTER2, 344 RSB_RECOVER_CONVERT, 345 RSB_RECOVER_GRANT, 346 RSB_RECOVER_LVB_INVAL, 347 }; 348 349 static inline void rsb_set_flag(struct dlm_rsb *r, enum rsb_flags flag) 350 { 351 __set_bit(flag, &r->res_flags); 352 } 353 354 static inline void rsb_clear_flag(struct dlm_rsb *r, enum rsb_flags flag) 355 { 356 __clear_bit(flag, &r->res_flags); 357 } 358 359 static inline int rsb_flag(struct dlm_rsb *r, enum rsb_flags flag) 360 { 361 return test_bit(flag, &r->res_flags); 362 } 363 364 365 /* dlm_header is first element of all structs sent between nodes */ 366 367 #define DLM_HEADER_MAJOR 0x00030000 368 #define DLM_HEADER_MINOR 0x00000002 369 370 #define DLM_VERSION_3_1 0x00030001 371 #define DLM_VERSION_3_2 0x00030002 372 373 #define DLM_HEADER_SLOTS 0x00000001 374 375 #define DLM_MSG 1 376 #define DLM_RCOM 2 377 #define DLM_OPTS 3 378 #define DLM_ACK 4 379 #define DLM_FIN 5 380 381 struct dlm_header { 382 uint32_t h_version; 383 union { 384 /* for DLM_MSG and DLM_RCOM */ 385 uint32_t h_lockspace; 386 /* for DLM_ACK and DLM_OPTS */ 387 uint32_t h_seq; 388 } u; 389 uint32_t h_nodeid; /* nodeid of sender */ 390 uint16_t h_length; 391 uint8_t h_cmd; /* DLM_MSG, DLM_RCOM */ 392 uint8_t h_pad; 393 }; 394 395 #define DLM_MSG_REQUEST 1 396 #define DLM_MSG_CONVERT 2 397 #define DLM_MSG_UNLOCK 3 398 #define DLM_MSG_CANCEL 4 399 #define DLM_MSG_REQUEST_REPLY 5 400 #define DLM_MSG_CONVERT_REPLY 6 401 #define DLM_MSG_UNLOCK_REPLY 7 402 #define DLM_MSG_CANCEL_REPLY 8 403 #define DLM_MSG_GRANT 9 404 #define DLM_MSG_BAST 10 405 #define DLM_MSG_LOOKUP 11 406 #define DLM_MSG_REMOVE 12 407 #define DLM_MSG_LOOKUP_REPLY 13 408 #define DLM_MSG_PURGE 14 409 410 struct dlm_message { 411 struct dlm_header m_header; 412 uint32_t m_type; /* DLM_MSG_ */ 413 uint32_t m_nodeid; 414 uint32_t m_pid; 415 uint32_t m_lkid; /* lkid on sender */ 416 uint32_t m_remid; /* lkid on receiver */ 417 uint32_t m_parent_lkid; 418 uint32_t m_parent_remid; 419 uint32_t m_exflags; 420 uint32_t m_sbflags; 421 uint32_t m_flags; 422 uint32_t m_lvbseq; 423 uint32_t m_hash; 424 int m_status; 425 int m_grmode; 426 int m_rqmode; 427 int m_bastmode; 428 int m_asts; 429 int m_result; /* 0 or -EXXX */ 430 char m_extra[]; /* name or lvb */ 431 }; 432 433 434 #define DLM_RS_NODES 0x00000001 435 #define DLM_RS_NODES_ALL 0x00000002 436 #define DLM_RS_DIR 0x00000004 437 #define DLM_RS_DIR_ALL 0x00000008 438 #define DLM_RS_LOCKS 0x00000010 439 #define DLM_RS_LOCKS_ALL 0x00000020 440 #define DLM_RS_DONE 0x00000040 441 #define DLM_RS_DONE_ALL 0x00000080 442 443 #define DLM_RCOM_STATUS 1 444 #define DLM_RCOM_NAMES 2 445 #define DLM_RCOM_LOOKUP 3 446 #define DLM_RCOM_LOCK 4 447 #define DLM_RCOM_STATUS_REPLY 5 448 #define DLM_RCOM_NAMES_REPLY 6 449 #define DLM_RCOM_LOOKUP_REPLY 7 450 #define DLM_RCOM_LOCK_REPLY 8 451 452 struct dlm_rcom { 453 struct dlm_header rc_header; 454 uint32_t rc_type; /* DLM_RCOM_ */ 455 int rc_result; /* multi-purpose */ 456 uint64_t rc_id; /* match reply with request */ 457 uint64_t rc_seq; /* sender's ls_recover_seq */ 458 uint64_t rc_seq_reply; /* remote ls_recover_seq */ 459 char rc_buf[]; 460 }; 461 462 struct dlm_opt_header { 463 uint16_t t_type; 464 uint16_t t_length; 465 uint32_t t_pad; 466 /* need to be 8 byte aligned */ 467 char t_value[]; 468 }; 469 470 /* encapsulation header */ 471 struct dlm_opts { 472 struct dlm_header o_header; 473 uint8_t o_nextcmd; 474 uint8_t o_pad; 475 uint16_t o_optlen; 476 uint32_t o_pad2; 477 char o_opts[]; 478 }; 479 480 union dlm_packet { 481 struct dlm_header header; /* common to other two */ 482 struct dlm_message message; 483 struct dlm_rcom rcom; 484 struct dlm_opts opts; 485 }; 486 487 #define DLM_RSF_NEED_SLOTS 0x00000001 488 489 /* RCOM_STATUS data */ 490 struct rcom_status { 491 __le32 rs_flags; 492 __le32 rs_unused1; 493 __le64 rs_unused2; 494 }; 495 496 /* RCOM_STATUS_REPLY data */ 497 struct rcom_config { 498 __le32 rf_lvblen; 499 __le32 rf_lsflags; 500 501 /* DLM_HEADER_SLOTS adds: */ 502 __le32 rf_flags; 503 __le16 rf_our_slot; 504 __le16 rf_num_slots; 505 __le32 rf_generation; 506 __le32 rf_unused1; 507 __le64 rf_unused2; 508 }; 509 510 struct rcom_slot { 511 __le32 ro_nodeid; 512 __le16 ro_slot; 513 __le16 ro_unused1; 514 __le64 ro_unused2; 515 }; 516 517 struct rcom_lock { 518 __le32 rl_ownpid; 519 __le32 rl_lkid; 520 __le32 rl_remid; 521 __le32 rl_parent_lkid; 522 __le32 rl_parent_remid; 523 __le32 rl_exflags; 524 __le32 rl_flags; 525 __le32 rl_lvbseq; 526 __le32 rl_result; 527 int8_t rl_rqmode; 528 int8_t rl_grmode; 529 int8_t rl_status; 530 int8_t rl_asts; 531 __le16 rl_wait_type; 532 __le16 rl_namelen; 533 char rl_name[DLM_RESNAME_MAXLEN]; 534 char rl_lvb[]; 535 }; 536 537 /* 538 * The max number of resources per rsbtbl bucket that shrink will attempt 539 * to remove in each iteration. 540 */ 541 542 #define DLM_REMOVE_NAMES_MAX 8 543 544 struct dlm_ls { 545 struct list_head ls_list; /* list of lockspaces */ 546 dlm_lockspace_t *ls_local_handle; 547 uint32_t ls_global_id; /* global unique lockspace ID */ 548 uint32_t ls_generation; 549 uint32_t ls_exflags; 550 int ls_lvblen; 551 atomic_t ls_count; /* refcount of processes in 552 the dlm using this ls */ 553 wait_queue_head_t ls_count_wait; 554 int ls_create_count; /* create/release refcount */ 555 unsigned long ls_flags; /* LSFL_ */ 556 unsigned long ls_scan_time; 557 struct kobject ls_kobj; 558 559 struct idr ls_lkbidr; 560 spinlock_t ls_lkbidr_spin; 561 562 struct dlm_rsbtable *ls_rsbtbl; 563 uint32_t ls_rsbtbl_size; 564 565 struct mutex ls_waiters_mutex; 566 struct list_head ls_waiters; /* lkbs needing a reply */ 567 568 struct mutex ls_orphans_mutex; 569 struct list_head ls_orphans; 570 571 struct mutex ls_timeout_mutex; 572 struct list_head ls_timeout; 573 574 spinlock_t ls_new_rsb_spin; 575 int ls_new_rsb_count; 576 struct list_head ls_new_rsb; /* new rsb structs */ 577 578 spinlock_t ls_remove_spin; 579 wait_queue_head_t ls_remove_wait; 580 char ls_remove_name[DLM_RESNAME_MAXLEN+1]; 581 char *ls_remove_names[DLM_REMOVE_NAMES_MAX]; 582 int ls_remove_len; 583 int ls_remove_lens[DLM_REMOVE_NAMES_MAX]; 584 585 struct list_head ls_nodes; /* current nodes in ls */ 586 struct list_head ls_nodes_gone; /* dead node list, recovery */ 587 int ls_num_nodes; /* number of nodes in ls */ 588 int ls_low_nodeid; 589 int ls_total_weight; 590 int *ls_node_array; 591 592 int ls_slot; 593 int ls_num_slots; 594 int ls_slots_size; 595 struct dlm_slot *ls_slots; 596 597 struct dlm_rsb ls_stub_rsb; /* for returning errors */ 598 struct dlm_lkb ls_stub_lkb; /* for returning errors */ 599 struct dlm_message ls_stub_ms; /* for faking a reply */ 600 601 struct dentry *ls_debug_rsb_dentry; /* debugfs */ 602 struct dentry *ls_debug_waiters_dentry; /* debugfs */ 603 struct dentry *ls_debug_locks_dentry; /* debugfs */ 604 struct dentry *ls_debug_all_dentry; /* debugfs */ 605 struct dentry *ls_debug_toss_dentry; /* debugfs */ 606 607 wait_queue_head_t ls_uevent_wait; /* user part of join/leave */ 608 int ls_uevent_result; 609 struct completion ls_members_done; 610 int ls_members_result; 611 612 struct miscdevice ls_device; 613 614 struct workqueue_struct *ls_callback_wq; 615 616 /* recovery related */ 617 618 struct mutex ls_cb_mutex; 619 struct list_head ls_cb_delay; /* save for queue_work later */ 620 struct timer_list ls_timer; 621 struct task_struct *ls_recoverd_task; 622 struct mutex ls_recoverd_active; 623 spinlock_t ls_recover_lock; 624 unsigned long ls_recover_begin; /* jiffies timestamp */ 625 uint32_t ls_recover_status; /* DLM_RS_ */ 626 uint64_t ls_recover_seq; 627 struct dlm_recover *ls_recover_args; 628 struct rw_semaphore ls_in_recovery; /* block local requests */ 629 struct rw_semaphore ls_recv_active; /* block dlm_recv */ 630 struct list_head ls_requestqueue;/* queue remote requests */ 631 atomic_t ls_requestqueue_cnt; 632 wait_queue_head_t ls_requestqueue_wait; 633 struct mutex ls_requestqueue_mutex; 634 struct dlm_rcom *ls_recover_buf; 635 int ls_recover_nodeid; /* for debugging */ 636 unsigned int ls_recover_dir_sent_res; /* for log info */ 637 unsigned int ls_recover_dir_sent_msg; /* for log info */ 638 unsigned int ls_recover_locks_in; /* for log info */ 639 uint64_t ls_rcom_seq; 640 spinlock_t ls_rcom_spin; 641 struct list_head ls_recover_list; 642 spinlock_t ls_recover_list_lock; 643 int ls_recover_list_count; 644 struct idr ls_recover_idr; 645 spinlock_t ls_recover_idr_lock; 646 wait_queue_head_t ls_wait_general; 647 wait_queue_head_t ls_recover_lock_wait; 648 struct mutex ls_clear_proc_locks; 649 650 struct list_head ls_root_list; /* root resources */ 651 struct rw_semaphore ls_root_sem; /* protect root_list */ 652 653 const struct dlm_lockspace_ops *ls_ops; 654 void *ls_ops_arg; 655 656 int ls_namelen; 657 char ls_name[1]; 658 }; 659 660 /* 661 * LSFL_RECOVER_STOP - dlm_ls_stop() sets this to tell dlm recovery routines 662 * that they should abort what they're doing so new recovery can be started. 663 * 664 * LSFL_RECOVER_DOWN - dlm_ls_stop() sets this to tell dlm_recoverd that it 665 * should do down_write() on the in_recovery rw_semaphore. (doing down_write 666 * within dlm_ls_stop causes complaints about the lock acquired/released 667 * in different contexts.) 668 * 669 * LSFL_RECOVER_LOCK - dlm_recoverd holds the in_recovery rw_semaphore. 670 * It sets this after it is done with down_write() on the in_recovery 671 * rw_semaphore and clears it after it has released the rw_semaphore. 672 * 673 * LSFL_RECOVER_WORK - dlm_ls_start() sets this to tell dlm_recoverd that it 674 * should begin recovery of the lockspace. 675 * 676 * LSFL_RUNNING - set when normal locking activity is enabled. 677 * dlm_ls_stop() clears this to tell dlm locking routines that they should 678 * quit what they are doing so recovery can run. dlm_recoverd sets 679 * this after recovery is finished. 680 */ 681 682 #define LSFL_RECOVER_STOP 0 683 #define LSFL_RECOVER_DOWN 1 684 #define LSFL_RECOVER_LOCK 2 685 #define LSFL_RECOVER_WORK 3 686 #define LSFL_RUNNING 4 687 688 #define LSFL_RCOM_READY 5 689 #define LSFL_RCOM_WAIT 6 690 #define LSFL_UEVENT_WAIT 7 691 #define LSFL_TIMEWARN 8 692 #define LSFL_CB_DELAY 9 693 #define LSFL_NODIR 10 694 695 /* much of this is just saving user space pointers associated with the 696 lock that we pass back to the user lib with an ast */ 697 698 struct dlm_user_args { 699 struct dlm_user_proc *proc; /* each process that opens the lockspace 700 device has private data 701 (dlm_user_proc) on the struct file, 702 the process's locks point back to it*/ 703 struct dlm_lksb lksb; 704 struct dlm_lksb __user *user_lksb; 705 void __user *castparam; 706 void __user *castaddr; 707 void __user *bastparam; 708 void __user *bastaddr; 709 uint64_t xid; 710 }; 711 712 #define DLM_PROC_FLAGS_CLOSING 1 713 #define DLM_PROC_FLAGS_COMPAT 2 714 715 /* locks list is kept so we can remove all a process's locks when it 716 exits (or orphan those that are persistent) */ 717 718 struct dlm_user_proc { 719 dlm_lockspace_t *lockspace; 720 unsigned long flags; /* DLM_PROC_FLAGS */ 721 struct list_head asts; 722 spinlock_t asts_spin; 723 struct list_head locks; 724 spinlock_t locks_spin; 725 struct list_head unlocking; 726 wait_queue_head_t wait; 727 }; 728 729 static inline int dlm_locking_stopped(struct dlm_ls *ls) 730 { 731 return !test_bit(LSFL_RUNNING, &ls->ls_flags); 732 } 733 734 static inline int dlm_recovery_stopped(struct dlm_ls *ls) 735 { 736 return test_bit(LSFL_RECOVER_STOP, &ls->ls_flags); 737 } 738 739 static inline int dlm_no_directory(struct dlm_ls *ls) 740 { 741 return test_bit(LSFL_NODIR, &ls->ls_flags); 742 } 743 744 int dlm_netlink_init(void); 745 void dlm_netlink_exit(void); 746 void dlm_timeout_warn(struct dlm_lkb *lkb); 747 int dlm_plock_init(void); 748 void dlm_plock_exit(void); 749 750 #ifdef CONFIG_DLM_DEBUG 751 void dlm_register_debugfs(void); 752 void dlm_unregister_debugfs(void); 753 void dlm_create_debug_file(struct dlm_ls *ls); 754 void dlm_delete_debug_file(struct dlm_ls *ls); 755 void *dlm_create_debug_comms_file(int nodeid, void *data); 756 void dlm_delete_debug_comms_file(void *ctx); 757 #else 758 static inline void dlm_register_debugfs(void) { } 759 static inline void dlm_unregister_debugfs(void) { } 760 static inline void dlm_create_debug_file(struct dlm_ls *ls) { } 761 static inline void dlm_delete_debug_file(struct dlm_ls *ls) { } 762 static inline void *dlm_create_debug_comms_file(int nodeid, void *data) { return NULL; } 763 static inline void dlm_delete_debug_comms_file(void *ctx) { } 764 #endif 765 766 #endif /* __DLM_INTERNAL_DOT_H__ */ 767 768