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