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 /* Size of the temp buffer midcomms allocates on the stack. 45 We try to make this large enough so most messages fit. 46 FIXME: should sctp make this unnecessary? */ 47 48 #define DLM_INBUF_LEN 148 49 50 struct dlm_ls; 51 struct dlm_lkb; 52 struct dlm_rsb; 53 struct dlm_member; 54 struct dlm_rsbtable; 55 struct dlm_recover; 56 struct dlm_header; 57 struct dlm_message; 58 struct dlm_rcom; 59 struct dlm_mhandle; 60 struct dlm_msg; 61 62 #define log_print(fmt, args...) \ 63 printk(KERN_ERR "dlm: "fmt"\n" , ##args) 64 #define log_print_ratelimited(fmt, args...) \ 65 printk_ratelimited(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 panic("DLM: Record message above and reboot.\n"); \ 104 } \ 105 } 106 107 108 #define DLM_RTF_SHRINK 0x00000001 109 110 struct dlm_rsbtable { 111 struct rb_root keep; 112 struct rb_root toss; 113 spinlock_t lock; 114 uint32_t flags; 115 }; 116 117 118 /* 119 * Lockspace member (per node in a ls) 120 */ 121 122 struct dlm_member { 123 struct list_head list; 124 int nodeid; 125 int weight; 126 int slot; 127 int slot_prev; 128 int comm_seq; 129 uint32_t generation; 130 }; 131 132 /* 133 * Save and manage recovery state for a lockspace. 134 */ 135 136 struct dlm_recover { 137 struct list_head list; 138 struct dlm_config_node *nodes; 139 int nodes_count; 140 uint64_t seq; 141 }; 142 143 /* 144 * Pass input args to second stage locking function. 145 */ 146 147 struct dlm_args { 148 uint32_t flags; 149 void (*astfn) (void *astparam); 150 void *astparam; 151 void (*bastfn) (void *astparam, int mode); 152 int mode; 153 struct dlm_lksb *lksb; 154 unsigned long timeout; 155 }; 156 157 158 /* 159 * Lock block 160 * 161 * A lock can be one of three types: 162 * 163 * local copy lock is mastered locally 164 * (lkb_nodeid is zero and DLM_LKF_MSTCPY is not set) 165 * process copy lock is mastered on a remote node 166 * (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is not set) 167 * master copy master node's copy of a lock owned by remote node 168 * (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is set) 169 * 170 * lkb_exflags: a copy of the most recent flags arg provided to dlm_lock or 171 * dlm_unlock. The dlm does not modify these or use any private flags in 172 * this field; it only contains DLM_LKF_ flags from dlm.h. These flags 173 * are sent as-is to the remote master when the lock is remote. 174 * 175 * lkb_flags: internal dlm flags (DLM_IFL_ prefix) from dlm_internal.h. 176 * Some internal flags are shared between the master and process nodes; 177 * these shared flags are kept in the lower two bytes. One of these 178 * flags set on the master copy will be propagated to the process copy 179 * and v.v. Other internal flags are private to the master or process 180 * node (e.g. DLM_IFL_MSTCPY). These are kept in the high two bytes. 181 * 182 * lkb_sbflags: status block flags. These flags are copied directly into 183 * the caller's lksb.sb_flags prior to the dlm_lock/dlm_unlock completion 184 * ast. All defined in dlm.h with DLM_SBF_ prefix. 185 * 186 * lkb_status: the lock status indicates which rsb queue the lock is 187 * on, grant, convert, or wait. DLM_LKSTS_ WAITING/GRANTED/CONVERT 188 * 189 * lkb_wait_type: the dlm message type (DLM_MSG_ prefix) for which a 190 * reply is needed. Only set when the lkb is on the lockspace waiters 191 * list awaiting a reply from a remote node. 192 * 193 * lkb_nodeid: when the lkb is a local copy, nodeid is 0; when the lkb 194 * is a master copy, nodeid specifies the remote lock holder, when the 195 * lkb is a process copy, the nodeid specifies the lock master. 196 */ 197 198 /* lkb_status */ 199 200 #define DLM_LKSTS_WAITING 1 201 #define DLM_LKSTS_GRANTED 2 202 #define DLM_LKSTS_CONVERT 3 203 204 /* lkb_flags */ 205 206 #define DLM_IFL_MSTCPY 0x00010000 207 #define DLM_IFL_RESEND 0x00020000 208 #define DLM_IFL_DEAD 0x00040000 209 #define DLM_IFL_OVERLAP_UNLOCK 0x00080000 210 #define DLM_IFL_OVERLAP_CANCEL 0x00100000 211 #define DLM_IFL_ENDOFLIFE 0x00200000 212 #define DLM_IFL_WATCH_TIMEWARN 0x00400000 213 #define DLM_IFL_TIMEOUT_CANCEL 0x00800000 214 #define DLM_IFL_DEADLOCK_CANCEL 0x01000000 215 #define DLM_IFL_STUB_MS 0x02000000 /* magic number for m_flags */ 216 #define DLM_IFL_USER 0x00000001 217 #define DLM_IFL_ORPHAN 0x00000002 218 219 #define DLM_CALLBACKS_SIZE 6 220 221 #define DLM_CB_CAST 0x00000001 222 #define DLM_CB_BAST 0x00000002 223 #define DLM_CB_SKIP 0x00000004 224 225 struct dlm_callback { 226 uint64_t seq; 227 uint32_t flags; /* DLM_CBF_ */ 228 int sb_status; /* copy to lksb status */ 229 uint8_t sb_flags; /* copy to lksb flags */ 230 int8_t mode; /* rq mode of bast, gr mode of cast */ 231 }; 232 233 struct dlm_lkb { 234 struct dlm_rsb *lkb_resource; /* the rsb */ 235 struct kref lkb_ref; 236 int lkb_nodeid; /* copied from rsb */ 237 int lkb_ownpid; /* pid of lock owner */ 238 uint32_t lkb_id; /* our lock ID */ 239 uint32_t lkb_remid; /* lock ID on remote partner */ 240 uint32_t lkb_exflags; /* external flags from caller */ 241 uint32_t lkb_sbflags; /* lksb flags */ 242 uint32_t lkb_flags; /* internal flags */ 243 uint32_t lkb_lvbseq; /* lvb sequence number */ 244 245 int8_t lkb_status; /* granted, waiting, convert */ 246 int8_t lkb_rqmode; /* requested lock mode */ 247 int8_t lkb_grmode; /* granted lock mode */ 248 int8_t lkb_highbast; /* highest mode bast sent for */ 249 250 int8_t lkb_wait_type; /* type of reply waiting for */ 251 int8_t lkb_wait_count; 252 int lkb_wait_nodeid; /* for debugging */ 253 254 struct list_head lkb_statequeue; /* rsb g/c/w list */ 255 struct list_head lkb_rsb_lookup; /* waiting for rsb lookup */ 256 struct list_head lkb_wait_reply; /* waiting for remote reply */ 257 struct list_head lkb_ownqueue; /* list of locks for a process */ 258 struct list_head lkb_time_list; 259 ktime_t lkb_timestamp; 260 ktime_t lkb_wait_time; 261 unsigned long lkb_timeout_cs; 262 263 struct mutex lkb_cb_mutex; 264 struct work_struct lkb_cb_work; 265 struct list_head lkb_cb_list; /* for ls_cb_delay or proc->asts */ 266 struct dlm_callback lkb_callbacks[DLM_CALLBACKS_SIZE]; 267 struct dlm_callback lkb_last_cast; 268 struct dlm_callback lkb_last_bast; 269 ktime_t lkb_last_cast_time; /* for debugging */ 270 ktime_t lkb_last_bast_time; /* for debugging */ 271 272 uint64_t lkb_recover_seq; /* from ls_recover_seq */ 273 274 char *lkb_lvbptr; 275 struct dlm_lksb *lkb_lksb; /* caller's status block */ 276 void (*lkb_astfn) (void *astparam); 277 void (*lkb_bastfn) (void *astparam, int mode); 278 union { 279 void *lkb_astparam; /* caller's ast arg */ 280 struct dlm_user_args *lkb_ua; 281 }; 282 }; 283 284 /* 285 * res_master_nodeid is "normal": 0 is unset/invalid, non-zero is the real 286 * nodeid, even when nodeid is our_nodeid. 287 * 288 * res_nodeid is "odd": -1 is unset/invalid, zero means our_nodeid, 289 * greater than zero when another nodeid. 290 * 291 * (TODO: remove res_nodeid and only use res_master_nodeid) 292 */ 293 294 struct dlm_rsb { 295 struct dlm_ls *res_ls; /* the lockspace */ 296 struct kref res_ref; 297 struct mutex res_mutex; 298 unsigned long res_flags; 299 int res_length; /* length of rsb name */ 300 int res_nodeid; 301 int res_master_nodeid; 302 int res_dir_nodeid; 303 int res_id; /* for ls_recover_idr */ 304 uint32_t res_lvbseq; 305 uint32_t res_hash; 306 uint32_t res_bucket; /* rsbtbl */ 307 unsigned long res_toss_time; 308 uint32_t res_first_lkid; 309 struct list_head res_lookup; /* lkbs waiting on first */ 310 union { 311 struct list_head res_hashchain; 312 struct rb_node res_hashnode; /* rsbtbl */ 313 }; 314 struct list_head res_grantqueue; 315 struct list_head res_convertqueue; 316 struct list_head res_waitqueue; 317 318 struct list_head res_root_list; /* used for recovery */ 319 struct list_head res_recover_list; /* used for recovery */ 320 int res_recover_locks_count; 321 322 char *res_lvbptr; 323 char res_name[DLM_RESNAME_MAXLEN+1]; 324 }; 325 326 /* dlm_master_lookup() flags */ 327 328 #define DLM_LU_RECOVER_DIR 1 329 #define DLM_LU_RECOVER_MASTER 2 330 331 /* dlm_master_lookup() results */ 332 333 #define DLM_LU_MATCH 1 334 #define DLM_LU_ADD 2 335 336 /* find_rsb() flags */ 337 338 #define R_REQUEST 0x00000001 339 #define R_RECEIVE_REQUEST 0x00000002 340 #define R_RECEIVE_RECOVER 0x00000004 341 342 /* rsb_flags */ 343 344 enum rsb_flags { 345 RSB_MASTER_UNCERTAIN, 346 RSB_VALNOTVALID, 347 RSB_VALNOTVALID_PREV, 348 RSB_NEW_MASTER, 349 RSB_NEW_MASTER2, 350 RSB_RECOVER_CONVERT, 351 RSB_RECOVER_GRANT, 352 RSB_RECOVER_LVB_INVAL, 353 }; 354 355 static inline void rsb_set_flag(struct dlm_rsb *r, enum rsb_flags flag) 356 { 357 __set_bit(flag, &r->res_flags); 358 } 359 360 static inline void rsb_clear_flag(struct dlm_rsb *r, enum rsb_flags flag) 361 { 362 __clear_bit(flag, &r->res_flags); 363 } 364 365 static inline int rsb_flag(struct dlm_rsb *r, enum rsb_flags flag) 366 { 367 return test_bit(flag, &r->res_flags); 368 } 369 370 371 /* dlm_header is first element of all structs sent between nodes */ 372 373 #define DLM_HEADER_MAJOR 0x00030000 374 #define DLM_HEADER_MINOR 0x00000002 375 376 #define DLM_VERSION_3_1 0x00030001 377 #define DLM_VERSION_3_2 0x00030002 378 379 #define DLM_HEADER_SLOTS 0x00000001 380 381 #define DLM_MSG 1 382 #define DLM_RCOM 2 383 #define DLM_OPTS 3 384 #define DLM_ACK 4 385 #define DLM_FIN 5 386 387 struct dlm_header { 388 uint32_t h_version; 389 union { 390 /* for DLM_MSG and DLM_RCOM */ 391 uint32_t h_lockspace; 392 /* for DLM_ACK and DLM_OPTS */ 393 uint32_t h_seq; 394 } u; 395 uint32_t h_nodeid; /* nodeid of sender */ 396 uint16_t h_length; 397 uint8_t h_cmd; /* DLM_MSG, DLM_RCOM */ 398 uint8_t h_pad; 399 }; 400 401 #define DLM_MSG_REQUEST 1 402 #define DLM_MSG_CONVERT 2 403 #define DLM_MSG_UNLOCK 3 404 #define DLM_MSG_CANCEL 4 405 #define DLM_MSG_REQUEST_REPLY 5 406 #define DLM_MSG_CONVERT_REPLY 6 407 #define DLM_MSG_UNLOCK_REPLY 7 408 #define DLM_MSG_CANCEL_REPLY 8 409 #define DLM_MSG_GRANT 9 410 #define DLM_MSG_BAST 10 411 #define DLM_MSG_LOOKUP 11 412 #define DLM_MSG_REMOVE 12 413 #define DLM_MSG_LOOKUP_REPLY 13 414 #define DLM_MSG_PURGE 14 415 416 struct dlm_message { 417 struct dlm_header m_header; 418 uint32_t m_type; /* DLM_MSG_ */ 419 uint32_t m_nodeid; 420 uint32_t m_pid; 421 uint32_t m_lkid; /* lkid on sender */ 422 uint32_t m_remid; /* lkid on receiver */ 423 uint32_t m_parent_lkid; 424 uint32_t m_parent_remid; 425 uint32_t m_exflags; 426 uint32_t m_sbflags; 427 uint32_t m_flags; 428 uint32_t m_lvbseq; 429 uint32_t m_hash; 430 int m_status; 431 int m_grmode; 432 int m_rqmode; 433 int m_bastmode; 434 int m_asts; 435 int m_result; /* 0 or -EXXX */ 436 char m_extra[]; /* name or lvb */ 437 }; 438 439 440 #define DLM_RS_NODES 0x00000001 441 #define DLM_RS_NODES_ALL 0x00000002 442 #define DLM_RS_DIR 0x00000004 443 #define DLM_RS_DIR_ALL 0x00000008 444 #define DLM_RS_LOCKS 0x00000010 445 #define DLM_RS_LOCKS_ALL 0x00000020 446 #define DLM_RS_DONE 0x00000040 447 #define DLM_RS_DONE_ALL 0x00000080 448 449 #define DLM_RCOM_STATUS 1 450 #define DLM_RCOM_NAMES 2 451 #define DLM_RCOM_LOOKUP 3 452 #define DLM_RCOM_LOCK 4 453 #define DLM_RCOM_STATUS_REPLY 5 454 #define DLM_RCOM_NAMES_REPLY 6 455 #define DLM_RCOM_LOOKUP_REPLY 7 456 #define DLM_RCOM_LOCK_REPLY 8 457 458 struct dlm_rcom { 459 struct dlm_header rc_header; 460 uint32_t rc_type; /* DLM_RCOM_ */ 461 int rc_result; /* multi-purpose */ 462 uint64_t rc_id; /* match reply with request */ 463 uint64_t rc_seq; /* sender's ls_recover_seq */ 464 uint64_t rc_seq_reply; /* remote ls_recover_seq */ 465 char rc_buf[]; 466 }; 467 468 struct dlm_opt_header { 469 uint16_t t_type; 470 uint16_t t_length; 471 uint32_t t_pad; 472 /* need to be 8 byte aligned */ 473 char t_value[]; 474 }; 475 476 /* encapsulation header */ 477 struct dlm_opts { 478 struct dlm_header o_header; 479 uint8_t o_nextcmd; 480 uint8_t o_pad; 481 uint16_t o_optlen; 482 uint32_t o_pad2; 483 char o_opts[]; 484 }; 485 486 union dlm_packet { 487 struct dlm_header header; /* common to other two */ 488 struct dlm_message message; 489 struct dlm_rcom rcom; 490 struct dlm_opts opts; 491 }; 492 493 #define DLM_RSF_NEED_SLOTS 0x00000001 494 495 /* RCOM_STATUS data */ 496 struct rcom_status { 497 __le32 rs_flags; 498 __le32 rs_unused1; 499 __le64 rs_unused2; 500 }; 501 502 /* RCOM_STATUS_REPLY data */ 503 struct rcom_config { 504 __le32 rf_lvblen; 505 __le32 rf_lsflags; 506 507 /* DLM_HEADER_SLOTS adds: */ 508 __le32 rf_flags; 509 __le16 rf_our_slot; 510 __le16 rf_num_slots; 511 __le32 rf_generation; 512 __le32 rf_unused1; 513 __le64 rf_unused2; 514 }; 515 516 struct rcom_slot { 517 __le32 ro_nodeid; 518 __le16 ro_slot; 519 __le16 ro_unused1; 520 __le64 ro_unused2; 521 }; 522 523 struct rcom_lock { 524 __le32 rl_ownpid; 525 __le32 rl_lkid; 526 __le32 rl_remid; 527 __le32 rl_parent_lkid; 528 __le32 rl_parent_remid; 529 __le32 rl_exflags; 530 __le32 rl_flags; 531 __le32 rl_lvbseq; 532 __le32 rl_result; 533 int8_t rl_rqmode; 534 int8_t rl_grmode; 535 int8_t rl_status; 536 int8_t rl_asts; 537 __le16 rl_wait_type; 538 __le16 rl_namelen; 539 char rl_name[DLM_RESNAME_MAXLEN]; 540 char rl_lvb[]; 541 }; 542 543 /* 544 * The max number of resources per rsbtbl bucket that shrink will attempt 545 * to remove in each iteration. 546 */ 547 548 #define DLM_REMOVE_NAMES_MAX 8 549 550 struct dlm_ls { 551 struct list_head ls_list; /* list of lockspaces */ 552 dlm_lockspace_t *ls_local_handle; 553 uint32_t ls_global_id; /* global unique lockspace ID */ 554 uint32_t ls_generation; 555 uint32_t ls_exflags; 556 int ls_lvblen; 557 int ls_count; /* refcount of processes in 558 the dlm using this ls */ 559 int ls_create_count; /* create/release refcount */ 560 unsigned long ls_flags; /* LSFL_ */ 561 unsigned long ls_scan_time; 562 struct kobject ls_kobj; 563 564 struct idr ls_lkbidr; 565 spinlock_t ls_lkbidr_spin; 566 567 struct dlm_rsbtable *ls_rsbtbl; 568 uint32_t ls_rsbtbl_size; 569 570 struct mutex ls_waiters_mutex; 571 struct list_head ls_waiters; /* lkbs needing a reply */ 572 573 struct mutex ls_orphans_mutex; 574 struct list_head ls_orphans; 575 576 struct mutex ls_timeout_mutex; 577 struct list_head ls_timeout; 578 579 spinlock_t ls_new_rsb_spin; 580 int ls_new_rsb_count; 581 struct list_head ls_new_rsb; /* new rsb structs */ 582 583 spinlock_t ls_remove_spin; 584 char ls_remove_name[DLM_RESNAME_MAXLEN+1]; 585 char *ls_remove_names[DLM_REMOVE_NAMES_MAX]; 586 int ls_remove_len; 587 int ls_remove_lens[DLM_REMOVE_NAMES_MAX]; 588 589 struct list_head ls_nodes; /* current nodes in ls */ 590 struct list_head ls_nodes_gone; /* dead node list, recovery */ 591 int ls_num_nodes; /* number of nodes in ls */ 592 int ls_low_nodeid; 593 int ls_total_weight; 594 int *ls_node_array; 595 596 int ls_slot; 597 int ls_num_slots; 598 int ls_slots_size; 599 struct dlm_slot *ls_slots; 600 601 struct dlm_rsb ls_stub_rsb; /* for returning errors */ 602 struct dlm_lkb ls_stub_lkb; /* for returning errors */ 603 struct dlm_message ls_stub_ms; /* for faking a reply */ 604 605 struct dentry *ls_debug_rsb_dentry; /* debugfs */ 606 struct dentry *ls_debug_waiters_dentry; /* debugfs */ 607 struct dentry *ls_debug_locks_dentry; /* debugfs */ 608 struct dentry *ls_debug_all_dentry; /* debugfs */ 609 struct dentry *ls_debug_toss_dentry; /* debugfs */ 610 611 wait_queue_head_t ls_uevent_wait; /* user part of join/leave */ 612 int ls_uevent_result; 613 struct completion ls_members_done; 614 int ls_members_result; 615 616 struct miscdevice ls_device; 617 618 struct workqueue_struct *ls_callback_wq; 619 620 /* recovery related */ 621 622 struct mutex ls_cb_mutex; 623 struct list_head ls_cb_delay; /* save for queue_work later */ 624 struct timer_list ls_timer; 625 struct task_struct *ls_recoverd_task; 626 struct mutex ls_recoverd_active; 627 spinlock_t ls_recover_lock; 628 unsigned long ls_recover_begin; /* jiffies timestamp */ 629 uint32_t ls_recover_status; /* DLM_RS_ */ 630 uint64_t ls_recover_seq; 631 struct dlm_recover *ls_recover_args; 632 struct rw_semaphore ls_in_recovery; /* block local requests */ 633 struct rw_semaphore ls_recv_active; /* block dlm_recv */ 634 struct list_head ls_requestqueue;/* queue remote requests */ 635 struct mutex ls_requestqueue_mutex; 636 struct dlm_rcom *ls_recover_buf; 637 int ls_recover_nodeid; /* for debugging */ 638 unsigned int ls_recover_dir_sent_res; /* for log info */ 639 unsigned int ls_recover_dir_sent_msg; /* for log info */ 640 unsigned int ls_recover_locks_in; /* for log info */ 641 uint64_t ls_rcom_seq; 642 spinlock_t ls_rcom_spin; 643 struct list_head ls_recover_list; 644 spinlock_t ls_recover_list_lock; 645 int ls_recover_list_count; 646 struct idr ls_recover_idr; 647 spinlock_t ls_recover_idr_lock; 648 wait_queue_head_t ls_wait_general; 649 wait_queue_head_t ls_recover_lock_wait; 650 struct mutex ls_clear_proc_locks; 651 652 struct list_head ls_root_list; /* root resources */ 653 struct rw_semaphore ls_root_sem; /* protect root_list */ 654 655 const struct dlm_lockspace_ops *ls_ops; 656 void *ls_ops_arg; 657 658 int ls_namelen; 659 char ls_name[1]; 660 }; 661 662 /* 663 * LSFL_RECOVER_STOP - dlm_ls_stop() sets this to tell dlm recovery routines 664 * that they should abort what they're doing so new recovery can be started. 665 * 666 * LSFL_RECOVER_DOWN - dlm_ls_stop() sets this to tell dlm_recoverd that it 667 * should do down_write() on the in_recovery rw_semaphore. (doing down_write 668 * within dlm_ls_stop causes complaints about the lock acquired/released 669 * in different contexts.) 670 * 671 * LSFL_RECOVER_LOCK - dlm_recoverd holds the in_recovery rw_semaphore. 672 * It sets this after it is done with down_write() on the in_recovery 673 * rw_semaphore and clears it after it has released the rw_semaphore. 674 * 675 * LSFL_RECOVER_WORK - dlm_ls_start() sets this to tell dlm_recoverd that it 676 * should begin recovery of the lockspace. 677 * 678 * LSFL_RUNNING - set when normal locking activity is enabled. 679 * dlm_ls_stop() clears this to tell dlm locking routines that they should 680 * quit what they are doing so recovery can run. dlm_recoverd sets 681 * this after recovery is finished. 682 */ 683 684 #define LSFL_RECOVER_STOP 0 685 #define LSFL_RECOVER_DOWN 1 686 #define LSFL_RECOVER_LOCK 2 687 #define LSFL_RECOVER_WORK 3 688 #define LSFL_RUNNING 4 689 690 #define LSFL_RCOM_READY 5 691 #define LSFL_RCOM_WAIT 6 692 #define LSFL_UEVENT_WAIT 7 693 #define LSFL_TIMEWARN 8 694 #define LSFL_CB_DELAY 9 695 #define LSFL_NODIR 10 696 697 /* much of this is just saving user space pointers associated with the 698 lock that we pass back to the user lib with an ast */ 699 700 struct dlm_user_args { 701 struct dlm_user_proc *proc; /* each process that opens the lockspace 702 device has private data 703 (dlm_user_proc) on the struct file, 704 the process's locks point back to it*/ 705 struct dlm_lksb lksb; 706 struct dlm_lksb __user *user_lksb; 707 void __user *castparam; 708 void __user *castaddr; 709 void __user *bastparam; 710 void __user *bastaddr; 711 uint64_t xid; 712 }; 713 714 #define DLM_PROC_FLAGS_CLOSING 1 715 #define DLM_PROC_FLAGS_COMPAT 2 716 717 /* locks list is kept so we can remove all a process's locks when it 718 exits (or orphan those that are persistent) */ 719 720 struct dlm_user_proc { 721 dlm_lockspace_t *lockspace; 722 unsigned long flags; /* DLM_PROC_FLAGS */ 723 struct list_head asts; 724 spinlock_t asts_spin; 725 struct list_head locks; 726 spinlock_t locks_spin; 727 struct list_head unlocking; 728 wait_queue_head_t wait; 729 }; 730 731 static inline int dlm_locking_stopped(struct dlm_ls *ls) 732 { 733 return !test_bit(LSFL_RUNNING, &ls->ls_flags); 734 } 735 736 static inline int dlm_recovery_stopped(struct dlm_ls *ls) 737 { 738 return test_bit(LSFL_RECOVER_STOP, &ls->ls_flags); 739 } 740 741 static inline int dlm_no_directory(struct dlm_ls *ls) 742 { 743 return test_bit(LSFL_NODIR, &ls->ls_flags); 744 } 745 746 int dlm_netlink_init(void); 747 void dlm_netlink_exit(void); 748 void dlm_timeout_warn(struct dlm_lkb *lkb); 749 int dlm_plock_init(void); 750 void dlm_plock_exit(void); 751 752 #ifdef CONFIG_DLM_DEBUG 753 void dlm_register_debugfs(void); 754 void dlm_unregister_debugfs(void); 755 void dlm_create_debug_file(struct dlm_ls *ls); 756 void dlm_delete_debug_file(struct dlm_ls *ls); 757 void *dlm_create_debug_comms_file(int nodeid, void *data); 758 void dlm_delete_debug_comms_file(void *ctx); 759 #else 760 static inline void dlm_register_debugfs(void) { } 761 static inline void dlm_unregister_debugfs(void) { } 762 static inline void dlm_create_debug_file(struct dlm_ls *ls) { } 763 static inline void dlm_delete_debug_file(struct dlm_ls *ls) { } 764 static inline void *dlm_create_debug_comms_file(int nodeid, void *data) { return NULL; } 765 static inline void dlm_delete_debug_comms_file(void *ctx) { } 766 #endif 767 768 #endif /* __DLM_INTERNAL_DOT_H__ */ 769 770