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