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/slab.h> 22 #include <linux/sched.h> 23 #include <linux/types.h> 24 #include <linux/ctype.h> 25 #include <linux/spinlock.h> 26 #include <linux/vmalloc.h> 27 #include <linux/list.h> 28 #include <linux/errno.h> 29 #include <linux/random.h> 30 #include <linux/delay.h> 31 #include <linux/socket.h> 32 #include <linux/kthread.h> 33 #include <linux/kobject.h> 34 #include <linux/kref.h> 35 #include <linux/kernel.h> 36 #include <linux/jhash.h> 37 #include <linux/miscdevice.h> 38 #include <linux/mutex.h> 39 #include <linux/idr.h> 40 #include <linux/ratelimit.h> 41 #include <linux/uaccess.h> 42 43 #include <linux/dlm.h> 44 #include "config.h" 45 46 /* Size of the temp buffer midcomms allocates on the stack. 47 We try to make this large enough so most messages fit. 48 FIXME: should sctp make this unnecessary? */ 49 50 #define DLM_INBUF_LEN 148 51 52 struct dlm_ls; 53 struct dlm_lkb; 54 struct dlm_rsb; 55 struct dlm_member; 56 struct dlm_rsbtable; 57 struct dlm_recover; 58 struct dlm_header; 59 struct dlm_message; 60 struct dlm_rcom; 61 struct dlm_mhandle; 62 63 #define log_print(fmt, args...) \ 64 printk(KERN_ERR "dlm: "fmt"\n" , ##args) 65 #define log_error(ls, fmt, args...) \ 66 printk(KERN_ERR "dlm: %s: " fmt "\n", (ls)->ls_name , ##args) 67 68 #define log_rinfo(ls, fmt, args...) \ 69 do { \ 70 if (dlm_config.ci_log_info) \ 71 printk(KERN_INFO "dlm: %s: " fmt "\n", \ 72 (ls)->ls_name, ##args); \ 73 else if (dlm_config.ci_log_debug) \ 74 printk(KERN_DEBUG "dlm: %s: " fmt "\n", \ 75 (ls)->ls_name , ##args); \ 76 } while (0) 77 78 #define log_debug(ls, fmt, args...) \ 79 do { \ 80 if (dlm_config.ci_log_debug) \ 81 printk(KERN_DEBUG "dlm: %s: " fmt "\n", \ 82 (ls)->ls_name , ##args); \ 83 } while (0) 84 85 #define log_limit(ls, fmt, args...) \ 86 do { \ 87 if (dlm_config.ci_log_debug) \ 88 printk_ratelimited(KERN_DEBUG "dlm: %s: " fmt "\n", \ 89 (ls)->ls_name , ##args); \ 90 } while (0) 91 92 #define DLM_ASSERT(x, do) \ 93 { \ 94 if (!(x)) \ 95 { \ 96 printk(KERN_ERR "\nDLM: Assertion failed on line %d of file %s\n" \ 97 "DLM: assertion: \"%s\"\n" \ 98 "DLM: time = %lu\n", \ 99 __LINE__, __FILE__, #x, jiffies); \ 100 {do} \ 101 printk("\n"); \ 102 BUG(); \ 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 0x00000001 375 376 #define DLM_HEADER_SLOTS 0x00000001 377 378 #define DLM_MSG 1 379 #define DLM_RCOM 2 380 381 struct dlm_header { 382 uint32_t h_version; 383 uint32_t h_lockspace; 384 uint32_t h_nodeid; /* nodeid of sender */ 385 uint16_t h_length; 386 uint8_t h_cmd; /* DLM_MSG, DLM_RCOM */ 387 uint8_t h_pad; 388 }; 389 390 391 #define DLM_MSG_REQUEST 1 392 #define DLM_MSG_CONVERT 2 393 #define DLM_MSG_UNLOCK 3 394 #define DLM_MSG_CANCEL 4 395 #define DLM_MSG_REQUEST_REPLY 5 396 #define DLM_MSG_CONVERT_REPLY 6 397 #define DLM_MSG_UNLOCK_REPLY 7 398 #define DLM_MSG_CANCEL_REPLY 8 399 #define DLM_MSG_GRANT 9 400 #define DLM_MSG_BAST 10 401 #define DLM_MSG_LOOKUP 11 402 #define DLM_MSG_REMOVE 12 403 #define DLM_MSG_LOOKUP_REPLY 13 404 #define DLM_MSG_PURGE 14 405 406 struct dlm_message { 407 struct dlm_header m_header; 408 uint32_t m_type; /* DLM_MSG_ */ 409 uint32_t m_nodeid; 410 uint32_t m_pid; 411 uint32_t m_lkid; /* lkid on sender */ 412 uint32_t m_remid; /* lkid on receiver */ 413 uint32_t m_parent_lkid; 414 uint32_t m_parent_remid; 415 uint32_t m_exflags; 416 uint32_t m_sbflags; 417 uint32_t m_flags; 418 uint32_t m_lvbseq; 419 uint32_t m_hash; 420 int m_status; 421 int m_grmode; 422 int m_rqmode; 423 int m_bastmode; 424 int m_asts; 425 int m_result; /* 0 or -EXXX */ 426 char m_extra[0]; /* name or lvb */ 427 }; 428 429 430 #define DLM_RS_NODES 0x00000001 431 #define DLM_RS_NODES_ALL 0x00000002 432 #define DLM_RS_DIR 0x00000004 433 #define DLM_RS_DIR_ALL 0x00000008 434 #define DLM_RS_LOCKS 0x00000010 435 #define DLM_RS_LOCKS_ALL 0x00000020 436 #define DLM_RS_DONE 0x00000040 437 #define DLM_RS_DONE_ALL 0x00000080 438 439 #define DLM_RCOM_STATUS 1 440 #define DLM_RCOM_NAMES 2 441 #define DLM_RCOM_LOOKUP 3 442 #define DLM_RCOM_LOCK 4 443 #define DLM_RCOM_STATUS_REPLY 5 444 #define DLM_RCOM_NAMES_REPLY 6 445 #define DLM_RCOM_LOOKUP_REPLY 7 446 #define DLM_RCOM_LOCK_REPLY 8 447 448 struct dlm_rcom { 449 struct dlm_header rc_header; 450 uint32_t rc_type; /* DLM_RCOM_ */ 451 int rc_result; /* multi-purpose */ 452 uint64_t rc_id; /* match reply with request */ 453 uint64_t rc_seq; /* sender's ls_recover_seq */ 454 uint64_t rc_seq_reply; /* remote ls_recover_seq */ 455 char rc_buf[0]; 456 }; 457 458 union dlm_packet { 459 struct dlm_header header; /* common to other two */ 460 struct dlm_message message; 461 struct dlm_rcom rcom; 462 }; 463 464 #define DLM_RSF_NEED_SLOTS 0x00000001 465 466 /* RCOM_STATUS data */ 467 struct rcom_status { 468 __le32 rs_flags; 469 __le32 rs_unused1; 470 __le64 rs_unused2; 471 }; 472 473 /* RCOM_STATUS_REPLY data */ 474 struct rcom_config { 475 __le32 rf_lvblen; 476 __le32 rf_lsflags; 477 478 /* DLM_HEADER_SLOTS adds: */ 479 __le32 rf_flags; 480 __le16 rf_our_slot; 481 __le16 rf_num_slots; 482 __le32 rf_generation; 483 __le32 rf_unused1; 484 __le64 rf_unused2; 485 }; 486 487 struct rcom_slot { 488 __le32 ro_nodeid; 489 __le16 ro_slot; 490 __le16 ro_unused1; 491 __le64 ro_unused2; 492 }; 493 494 struct rcom_lock { 495 __le32 rl_ownpid; 496 __le32 rl_lkid; 497 __le32 rl_remid; 498 __le32 rl_parent_lkid; 499 __le32 rl_parent_remid; 500 __le32 rl_exflags; 501 __le32 rl_flags; 502 __le32 rl_lvbseq; 503 __le32 rl_result; 504 int8_t rl_rqmode; 505 int8_t rl_grmode; 506 int8_t rl_status; 507 int8_t rl_asts; 508 __le16 rl_wait_type; 509 __le16 rl_namelen; 510 char rl_name[DLM_RESNAME_MAXLEN]; 511 char rl_lvb[0]; 512 }; 513 514 /* 515 * The max number of resources per rsbtbl bucket that shrink will attempt 516 * to remove in each iteration. 517 */ 518 519 #define DLM_REMOVE_NAMES_MAX 8 520 521 struct dlm_ls { 522 struct list_head ls_list; /* list of lockspaces */ 523 dlm_lockspace_t *ls_local_handle; 524 uint32_t ls_global_id; /* global unique lockspace ID */ 525 uint32_t ls_generation; 526 uint32_t ls_exflags; 527 int ls_lvblen; 528 int ls_count; /* refcount of processes in 529 the dlm using this ls */ 530 int ls_create_count; /* create/release refcount */ 531 unsigned long ls_flags; /* LSFL_ */ 532 unsigned long ls_scan_time; 533 struct kobject ls_kobj; 534 535 struct idr ls_lkbidr; 536 spinlock_t ls_lkbidr_spin; 537 538 struct dlm_rsbtable *ls_rsbtbl; 539 uint32_t ls_rsbtbl_size; 540 541 struct mutex ls_waiters_mutex; 542 struct list_head ls_waiters; /* lkbs needing a reply */ 543 544 struct mutex ls_orphans_mutex; 545 struct list_head ls_orphans; 546 547 struct mutex ls_timeout_mutex; 548 struct list_head ls_timeout; 549 550 spinlock_t ls_new_rsb_spin; 551 int ls_new_rsb_count; 552 struct list_head ls_new_rsb; /* new rsb structs */ 553 554 spinlock_t ls_remove_spin; 555 char ls_remove_name[DLM_RESNAME_MAXLEN+1]; 556 char *ls_remove_names[DLM_REMOVE_NAMES_MAX]; 557 int ls_remove_len; 558 int ls_remove_lens[DLM_REMOVE_NAMES_MAX]; 559 560 struct list_head ls_nodes; /* current nodes in ls */ 561 struct list_head ls_nodes_gone; /* dead node list, recovery */ 562 int ls_num_nodes; /* number of nodes in ls */ 563 int ls_low_nodeid; 564 int ls_total_weight; 565 int *ls_node_array; 566 567 int ls_slot; 568 int ls_num_slots; 569 int ls_slots_size; 570 struct dlm_slot *ls_slots; 571 572 struct dlm_rsb ls_stub_rsb; /* for returning errors */ 573 struct dlm_lkb ls_stub_lkb; /* for returning errors */ 574 struct dlm_message ls_stub_ms; /* for faking a reply */ 575 576 struct dentry *ls_debug_rsb_dentry; /* debugfs */ 577 struct dentry *ls_debug_waiters_dentry; /* debugfs */ 578 struct dentry *ls_debug_locks_dentry; /* debugfs */ 579 struct dentry *ls_debug_all_dentry; /* debugfs */ 580 struct dentry *ls_debug_toss_dentry; /* debugfs */ 581 582 wait_queue_head_t ls_uevent_wait; /* user part of join/leave */ 583 int ls_uevent_result; 584 struct completion ls_members_done; 585 int ls_members_result; 586 587 struct miscdevice ls_device; 588 589 struct workqueue_struct *ls_callback_wq; 590 591 /* recovery related */ 592 593 struct mutex ls_cb_mutex; 594 struct list_head ls_cb_delay; /* save for queue_work later */ 595 struct timer_list ls_timer; 596 struct task_struct *ls_recoverd_task; 597 struct mutex ls_recoverd_active; 598 spinlock_t ls_recover_lock; 599 unsigned long ls_recover_begin; /* jiffies timestamp */ 600 uint32_t ls_recover_status; /* DLM_RS_ */ 601 uint64_t ls_recover_seq; 602 struct dlm_recover *ls_recover_args; 603 struct rw_semaphore ls_in_recovery; /* block local requests */ 604 struct rw_semaphore ls_recv_active; /* block dlm_recv */ 605 struct list_head ls_requestqueue;/* queue remote requests */ 606 struct mutex ls_requestqueue_mutex; 607 struct dlm_rcom *ls_recover_buf; 608 int ls_recover_nodeid; /* for debugging */ 609 unsigned int ls_recover_dir_sent_res; /* for log info */ 610 unsigned int ls_recover_dir_sent_msg; /* for log info */ 611 unsigned int ls_recover_locks_in; /* for log info */ 612 uint64_t ls_rcom_seq; 613 spinlock_t ls_rcom_spin; 614 struct list_head ls_recover_list; 615 spinlock_t ls_recover_list_lock; 616 int ls_recover_list_count; 617 struct idr ls_recover_idr; 618 spinlock_t ls_recover_idr_lock; 619 wait_queue_head_t ls_wait_general; 620 wait_queue_head_t ls_recover_lock_wait; 621 struct mutex ls_clear_proc_locks; 622 623 struct list_head ls_root_list; /* root resources */ 624 struct rw_semaphore ls_root_sem; /* protect root_list */ 625 626 const struct dlm_lockspace_ops *ls_ops; 627 void *ls_ops_arg; 628 629 int ls_namelen; 630 char ls_name[1]; 631 }; 632 633 /* 634 * LSFL_RECOVER_STOP - dlm_ls_stop() sets this to tell dlm recovery routines 635 * that they should abort what they're doing so new recovery can be started. 636 * 637 * LSFL_RECOVER_DOWN - dlm_ls_stop() sets this to tell dlm_recoverd that it 638 * should do down_write() on the in_recovery rw_semaphore. (doing down_write 639 * within dlm_ls_stop causes complaints about the lock acquired/released 640 * in different contexts.) 641 * 642 * LSFL_RECOVER_LOCK - dlm_recoverd holds the in_recovery rw_semaphore. 643 * It sets this after it is done with down_write() on the in_recovery 644 * rw_semaphore and clears it after it has released the rw_semaphore. 645 * 646 * LSFL_RECOVER_WORK - dlm_ls_start() sets this to tell dlm_recoverd that it 647 * should begin recovery of the lockspace. 648 * 649 * LSFL_RUNNING - set when normal locking activity is enabled. 650 * dlm_ls_stop() clears this to tell dlm locking routines that they should 651 * quit what they are doing so recovery can run. dlm_recoverd sets 652 * this after recovery is finished. 653 */ 654 655 #define LSFL_RECOVER_STOP 0 656 #define LSFL_RECOVER_DOWN 1 657 #define LSFL_RECOVER_LOCK 2 658 #define LSFL_RECOVER_WORK 3 659 #define LSFL_RUNNING 4 660 661 #define LSFL_RCOM_READY 5 662 #define LSFL_RCOM_WAIT 6 663 #define LSFL_UEVENT_WAIT 7 664 #define LSFL_TIMEWARN 8 665 #define LSFL_CB_DELAY 9 666 #define LSFL_NODIR 10 667 668 /* much of this is just saving user space pointers associated with the 669 lock that we pass back to the user lib with an ast */ 670 671 struct dlm_user_args { 672 struct dlm_user_proc *proc; /* each process that opens the lockspace 673 device has private data 674 (dlm_user_proc) on the struct file, 675 the process's locks point back to it*/ 676 struct dlm_lksb lksb; 677 struct dlm_lksb __user *user_lksb; 678 void __user *castparam; 679 void __user *castaddr; 680 void __user *bastparam; 681 void __user *bastaddr; 682 uint64_t xid; 683 }; 684 685 #define DLM_PROC_FLAGS_CLOSING 1 686 #define DLM_PROC_FLAGS_COMPAT 2 687 688 /* locks list is kept so we can remove all a process's locks when it 689 exits (or orphan those that are persistent) */ 690 691 struct dlm_user_proc { 692 dlm_lockspace_t *lockspace; 693 unsigned long flags; /* DLM_PROC_FLAGS */ 694 struct list_head asts; 695 spinlock_t asts_spin; 696 struct list_head locks; 697 spinlock_t locks_spin; 698 struct list_head unlocking; 699 wait_queue_head_t wait; 700 }; 701 702 static inline int dlm_locking_stopped(struct dlm_ls *ls) 703 { 704 return !test_bit(LSFL_RUNNING, &ls->ls_flags); 705 } 706 707 static inline int dlm_recovery_stopped(struct dlm_ls *ls) 708 { 709 return test_bit(LSFL_RECOVER_STOP, &ls->ls_flags); 710 } 711 712 static inline int dlm_no_directory(struct dlm_ls *ls) 713 { 714 return test_bit(LSFL_NODIR, &ls->ls_flags); 715 } 716 717 int dlm_netlink_init(void); 718 void dlm_netlink_exit(void); 719 void dlm_timeout_warn(struct dlm_lkb *lkb); 720 int dlm_plock_init(void); 721 void dlm_plock_exit(void); 722 723 #ifdef CONFIG_DLM_DEBUG 724 int dlm_register_debugfs(void); 725 void dlm_unregister_debugfs(void); 726 int dlm_create_debug_file(struct dlm_ls *ls); 727 void dlm_delete_debug_file(struct dlm_ls *ls); 728 #else 729 static inline int dlm_register_debugfs(void) { return 0; } 730 static inline void dlm_unregister_debugfs(void) { } 731 static inline int dlm_create_debug_file(struct dlm_ls *ls) { return 0; } 732 static inline void dlm_delete_debug_file(struct dlm_ls *ls) { } 733 #endif 734 735 #endif /* __DLM_INTERNAL_DOT_H__ */ 736 737