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