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 <uapi/linux/dlm_device.h> 20 #include <linux/slab.h> 21 #include <linux/sched.h> 22 #include <linux/types.h> 23 #include <linux/ctype.h> 24 #include <linux/spinlock.h> 25 #include <linux/vmalloc.h> 26 #include <linux/list.h> 27 #include <linux/errno.h> 28 #include <linux/random.h> 29 #include <linux/delay.h> 30 #include <linux/socket.h> 31 #include <linux/kthread.h> 32 #include <linux/kobject.h> 33 #include <linux/kref.h> 34 #include <linux/kernel.h> 35 #include <linux/jhash.h> 36 #include <linux/miscdevice.h> 37 #include <linux/rhashtable.h> 38 #include <linux/mutex.h> 39 #include <linux/xarray.h> 40 #include <linux/ratelimit.h> 41 #include <linux/uaccess.h> 42 43 #include <linux/dlm.h> 44 #include "config.h" 45 46 struct dlm_ls; 47 struct dlm_lkb; 48 struct dlm_rsb; 49 struct dlm_member; 50 struct dlm_rsbtable; 51 struct dlm_recover; 52 struct dlm_header; 53 struct dlm_message; 54 struct dlm_rcom; 55 struct dlm_mhandle; 56 struct dlm_msg; 57 58 #define log_print(fmt, args...) \ 59 printk(KERN_ERR "dlm: "fmt"\n" , ##args) 60 #define log_print_ratelimited(fmt, args...) \ 61 printk_ratelimited(KERN_ERR "dlm: "fmt"\n", ##args) 62 #define log_error(ls, fmt, args...) \ 63 printk(KERN_ERR "dlm: %s: " fmt "\n", (ls)->ls_name , ##args) 64 65 #define log_rinfo(ls, fmt, args...) \ 66 do { \ 67 if (dlm_config.ci_log_info) \ 68 printk(KERN_INFO "dlm: %s: " fmt "\n", \ 69 (ls)->ls_name, ##args); \ 70 else if (dlm_config.ci_log_debug) \ 71 printk(KERN_DEBUG "dlm: %s: " fmt "\n", \ 72 (ls)->ls_name , ##args); \ 73 } while (0) 74 75 #define log_debug(ls, fmt, args...) \ 76 do { \ 77 if (dlm_config.ci_log_debug) \ 78 printk(KERN_DEBUG "dlm: %s: " fmt "\n", \ 79 (ls)->ls_name , ##args); \ 80 } while (0) 81 82 #define log_limit(ls, fmt, args...) \ 83 do { \ 84 if (dlm_config.ci_log_debug) \ 85 printk_ratelimited(KERN_DEBUG "dlm: %s: " fmt "\n", \ 86 (ls)->ls_name , ##args); \ 87 } while (0) 88 89 #define DLM_ASSERT(x, do) \ 90 { \ 91 if (!(x)) \ 92 { \ 93 printk(KERN_ERR "\nDLM: Assertion failed on line %d of file %s\n" \ 94 "DLM: assertion: \"%s\"\n" \ 95 "DLM: time = %lu\n", \ 96 __LINE__, __FILE__, #x, jiffies); \ 97 {do} \ 98 printk("\n"); \ 99 panic("DLM: Record message above and reboot.\n"); \ 100 } \ 101 } 102 103 /* 104 * Lockspace member (per node in a ls) 105 */ 106 107 struct dlm_member { 108 struct list_head list; 109 int nodeid; 110 int weight; 111 int slot; 112 int slot_prev; 113 int comm_seq; 114 uint32_t generation; 115 }; 116 117 /* 118 * Save and manage recovery state for a lockspace. 119 */ 120 121 struct dlm_recover { 122 struct list_head list; 123 struct dlm_config_node *nodes; 124 int nodes_count; 125 uint64_t seq; 126 }; 127 128 /* 129 * Pass input args to second stage locking function. 130 */ 131 132 struct dlm_args { 133 uint32_t flags; 134 void (*astfn) (void *astparam); 135 void *astparam; 136 void (*bastfn) (void *astparam, int mode); 137 int mode; 138 struct dlm_lksb *lksb; 139 }; 140 141 142 /* 143 * Lock block 144 * 145 * A lock can be one of three types: 146 * 147 * local copy lock is mastered locally 148 * (lkb_nodeid is zero and DLM_LKF_MSTCPY is not set) 149 * process copy lock is mastered on a remote node 150 * (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is not set) 151 * master copy master node's copy of a lock owned by remote node 152 * (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is set) 153 * 154 * lkb_exflags: a copy of the most recent flags arg provided to dlm_lock or 155 * dlm_unlock. The dlm does not modify these or use any private flags in 156 * this field; it only contains DLM_LKF_ flags from dlm.h. These flags 157 * are sent as-is to the remote master when the lock is remote. 158 * 159 * lkb_flags: internal dlm flags (DLM_IFL_ prefix) from dlm_internal.h. 160 * Some internal flags are shared between the master and process nodes; 161 * these shared flags are kept in the lower two bytes. One of these 162 * flags set on the master copy will be propagated to the process copy 163 * and v.v. Other internal flags are private to the master or process 164 * node (e.g. DLM_IFL_MSTCPY). These are kept in the high two bytes. 165 * 166 * lkb_sbflags: status block flags. These flags are copied directly into 167 * the caller's lksb.sb_flags prior to the dlm_lock/dlm_unlock completion 168 * ast. All defined in dlm.h with DLM_SBF_ prefix. 169 * 170 * lkb_status: the lock status indicates which rsb queue the lock is 171 * on, grant, convert, or wait. DLM_LKSTS_ WAITING/GRANTED/CONVERT 172 * 173 * lkb_wait_type: the dlm message type (DLM_MSG_ prefix) for which a 174 * reply is needed. Only set when the lkb is on the lockspace waiters 175 * list awaiting a reply from a remote node. 176 * 177 * lkb_nodeid: when the lkb is a local copy, nodeid is 0; when the lkb 178 * is a master copy, nodeid specifies the remote lock holder, when the 179 * lkb is a process copy, the nodeid specifies the lock master. 180 */ 181 182 /* lkb_status */ 183 184 #define DLM_LKSTS_WAITING 1 185 #define DLM_LKSTS_GRANTED 2 186 #define DLM_LKSTS_CONVERT 3 187 188 /* lkb_iflags */ 189 190 #define DLM_IFL_MSTCPY_BIT 16 191 #define __DLM_IFL_MIN_BIT DLM_IFL_MSTCPY_BIT 192 #define DLM_IFL_RESEND_BIT 17 193 #define DLM_IFL_DEAD_BIT 18 194 #define DLM_IFL_OVERLAP_UNLOCK_BIT 19 195 #define DLM_IFL_OVERLAP_CANCEL_BIT 20 196 #define DLM_IFL_ENDOFLIFE_BIT 21 197 #define DLM_IFL_DEADLOCK_CANCEL_BIT 24 198 #define __DLM_IFL_MAX_BIT DLM_IFL_DEADLOCK_CANCEL_BIT 199 200 /* lkb_dflags */ 201 202 #define DLM_DFL_USER_BIT 0 203 #define __DLM_DFL_MIN_BIT DLM_DFL_USER_BIT 204 #define DLM_DFL_ORPHAN_BIT 1 205 #define __DLM_DFL_MAX_BIT DLM_DFL_ORPHAN_BIT 206 207 #define DLM_CB_CAST 0x00000001 208 #define DLM_CB_BAST 0x00000002 209 210 /* much of this is just saving user space pointers associated with the 211 * lock that we pass back to the user lib with an ast 212 */ 213 214 struct dlm_user_args { 215 struct dlm_user_proc *proc; /* each process that opens the lockspace 216 * device has private data 217 * (dlm_user_proc) on the struct file, 218 * the process's locks point back to it 219 */ 220 struct dlm_lksb lksb; 221 struct dlm_lksb __user *user_lksb; 222 void __user *castparam; 223 void __user *castaddr; 224 void __user *bastparam; 225 void __user *bastaddr; 226 uint64_t xid; 227 }; 228 229 struct dlm_callback { 230 uint32_t flags; /* DLM_CBF_ */ 231 int sb_status; /* copy to lksb status */ 232 uint8_t sb_flags; /* copy to lksb flags */ 233 int8_t mode; /* rq mode of bast, gr mode of cast */ 234 bool copy_lvb; 235 struct dlm_lksb *lkb_lksb; 236 unsigned char lvbptr[DLM_USER_LVB_LEN]; 237 238 union { 239 void *astparam; /* caller's ast arg */ 240 struct dlm_user_args ua; 241 }; 242 struct work_struct work; 243 void (*bastfn)(void *astparam, int mode); 244 void (*astfn)(void *astparam); 245 char res_name[DLM_RESNAME_MAXLEN]; 246 size_t res_length; 247 uint32_t ls_id; 248 uint32_t lkb_id; 249 250 struct list_head list; 251 }; 252 253 struct dlm_lkb { 254 struct dlm_rsb *lkb_resource; /* the rsb */ 255 struct kref lkb_ref; 256 int lkb_nodeid; /* copied from rsb */ 257 int lkb_ownpid; /* pid of lock owner */ 258 uint32_t lkb_id; /* our lock ID */ 259 uint32_t lkb_remid; /* lock ID on remote partner */ 260 uint32_t lkb_exflags; /* external flags from caller */ 261 unsigned long lkb_sbflags; /* lksb flags */ 262 unsigned long lkb_dflags; /* distributed flags */ 263 unsigned long lkb_iflags; /* internal flags */ 264 uint32_t lkb_lvbseq; /* lvb sequence number */ 265 266 int8_t lkb_status; /* granted, waiting, convert */ 267 int8_t lkb_rqmode; /* requested lock mode */ 268 int8_t lkb_grmode; /* granted lock mode */ 269 int8_t lkb_highbast; /* highest mode bast sent for */ 270 271 int8_t lkb_wait_type; /* type of reply waiting for */ 272 int8_t lkb_wait_count; 273 int lkb_wait_nodeid; /* for debugging */ 274 275 struct list_head lkb_statequeue; /* rsb g/c/w list */ 276 struct list_head lkb_rsb_lookup; /* waiting for rsb lookup */ 277 struct list_head lkb_wait_reply; /* waiting for remote reply */ 278 struct list_head lkb_ownqueue; /* list of locks for a process */ 279 ktime_t lkb_timestamp; 280 281 int8_t lkb_last_cast_cb_mode; 282 int8_t lkb_last_bast_cb_mode; 283 int8_t lkb_last_cb_mode; 284 uint8_t lkb_last_cb_flags; 285 ktime_t lkb_last_cast_time; /* for debugging */ 286 ktime_t lkb_last_bast_time; /* for debugging */ 287 288 uint64_t lkb_recover_seq; /* from ls_recover_seq */ 289 290 char *lkb_lvbptr; 291 struct dlm_lksb *lkb_lksb; /* caller's status block */ 292 void (*lkb_astfn) (void *astparam); 293 void (*lkb_bastfn) (void *astparam, int mode); 294 union { 295 void *lkb_astparam; /* caller's ast arg */ 296 struct dlm_user_args *lkb_ua; 297 }; 298 struct rcu_head rcu; 299 }; 300 301 /* 302 * res_master_nodeid is "normal": 0 is unset/invalid, non-zero is the real 303 * nodeid, even when nodeid is our_nodeid. 304 * 305 * res_nodeid is "odd": -1 is unset/invalid, zero means our_nodeid, 306 * greater than zero when another nodeid. 307 * 308 * (TODO: remove res_nodeid and only use res_master_nodeid) 309 */ 310 311 struct dlm_rsb { 312 struct dlm_ls *res_ls; /* the lockspace */ 313 struct kref res_ref; 314 spinlock_t res_lock; 315 unsigned long res_flags; 316 int res_length; /* length of rsb name */ 317 int res_nodeid; 318 int res_master_nodeid; 319 int res_dir_nodeid; 320 unsigned long res_id; /* for ls_recover_xa */ 321 uint32_t res_lvbseq; 322 uint32_t res_hash; 323 unsigned long res_toss_time; 324 uint32_t res_first_lkid; 325 struct list_head res_lookup; /* lkbs waiting on first */ 326 struct rhash_head res_node; /* rsbtbl */ 327 struct list_head res_grantqueue; 328 struct list_head res_convertqueue; 329 struct list_head res_waitqueue; 330 331 struct list_head res_slow_list; /* ls_slow_* */ 332 struct list_head res_scan_list; 333 struct list_head res_root_list; /* used for recovery */ 334 struct list_head res_masters_list; /* used for recovery */ 335 struct list_head res_recover_list; /* used for recovery */ 336 int res_recover_locks_count; 337 struct rcu_head rcu; 338 339 char *res_lvbptr; 340 char res_name[DLM_RESNAME_MAXLEN+1]; 341 }; 342 343 /* dlm_master_lookup() flags */ 344 345 #define DLM_LU_RECOVER_DIR 1 346 #define DLM_LU_RECOVER_MASTER 2 347 348 /* dlm_master_lookup() results */ 349 350 #define DLM_LU_MATCH 1 351 #define DLM_LU_ADD 2 352 353 /* find_rsb() flags */ 354 355 #define R_REQUEST 0x00000001 356 #define R_RECEIVE_REQUEST 0x00000002 357 #define R_RECEIVE_RECOVER 0x00000004 358 359 /* rsb_flags */ 360 361 enum rsb_flags { 362 RSB_MASTER_UNCERTAIN, 363 RSB_VALNOTVALID, 364 RSB_VALNOTVALID_PREV, 365 RSB_NEW_MASTER, 366 RSB_NEW_MASTER2, 367 RSB_RECOVER_CONVERT, 368 RSB_RECOVER_GRANT, 369 RSB_RECOVER_LVB_INVAL, 370 RSB_INACTIVE, 371 RSB_HASHED, /* set while rsb is on ls_rsbtbl */ 372 }; 373 rsb_set_flag(struct dlm_rsb * r,enum rsb_flags flag)374 static inline void rsb_set_flag(struct dlm_rsb *r, enum rsb_flags flag) 375 { 376 __set_bit(flag, &r->res_flags); 377 } 378 rsb_clear_flag(struct dlm_rsb * r,enum rsb_flags flag)379 static inline void rsb_clear_flag(struct dlm_rsb *r, enum rsb_flags flag) 380 { 381 __clear_bit(flag, &r->res_flags); 382 } 383 rsb_flag(struct dlm_rsb * r,enum rsb_flags flag)384 static inline int rsb_flag(struct dlm_rsb *r, enum rsb_flags flag) 385 { 386 return test_bit(flag, &r->res_flags); 387 } 388 389 390 /* dlm_header is first element of all structs sent between nodes */ 391 392 #define DLM_HEADER_MAJOR 0x00030000 393 #define DLM_HEADER_MINOR 0x00000002 394 395 #define DLM_VERSION_3_1 0x00030001 396 #define DLM_VERSION_3_2 0x00030002 397 398 #define DLM_HEADER_SLOTS 0x00000001 399 400 #define DLM_MSG 1 401 #define DLM_RCOM 2 402 #define DLM_OPTS 3 403 #define DLM_ACK 4 404 #define DLM_FIN 5 405 406 struct dlm_header { 407 __le32 h_version; 408 union { 409 /* for DLM_MSG and DLM_RCOM */ 410 __le32 h_lockspace; 411 /* for DLM_ACK and DLM_OPTS */ 412 __le32 h_seq; 413 } u; 414 __le32 h_nodeid; /* nodeid of sender */ 415 __le16 h_length; 416 uint8_t h_cmd; /* DLM_MSG, DLM_RCOM */ 417 uint8_t h_pad; 418 }; 419 420 #define DLM_MSG_REQUEST 1 421 #define DLM_MSG_CONVERT 2 422 #define DLM_MSG_UNLOCK 3 423 #define DLM_MSG_CANCEL 4 424 #define DLM_MSG_REQUEST_REPLY 5 425 #define DLM_MSG_CONVERT_REPLY 6 426 #define DLM_MSG_UNLOCK_REPLY 7 427 #define DLM_MSG_CANCEL_REPLY 8 428 #define DLM_MSG_GRANT 9 429 #define DLM_MSG_BAST 10 430 #define DLM_MSG_LOOKUP 11 431 #define DLM_MSG_REMOVE 12 432 #define DLM_MSG_LOOKUP_REPLY 13 433 #define DLM_MSG_PURGE 14 434 435 struct dlm_message { 436 struct dlm_header m_header; 437 __le32 m_type; /* DLM_MSG_ */ 438 __le32 m_nodeid; 439 __le32 m_pid; 440 __le32 m_lkid; /* lkid on sender */ 441 __le32 m_remid; /* lkid on receiver */ 442 __le32 m_parent_lkid; 443 __le32 m_parent_remid; 444 __le32 m_exflags; 445 __le32 m_sbflags; 446 __le32 m_flags; 447 __le32 m_lvbseq; 448 __le32 m_hash; 449 __le32 m_status; 450 __le32 m_grmode; 451 __le32 m_rqmode; 452 __le32 m_bastmode; 453 __le32 m_asts; 454 __le32 m_result; /* 0 or -EXXX */ 455 char m_extra[]; /* name or lvb */ 456 }; 457 458 459 #define DLM_RS_NODES 0x00000001 460 #define DLM_RS_NODES_ALL 0x00000002 461 #define DLM_RS_DIR 0x00000004 462 #define DLM_RS_DIR_ALL 0x00000008 463 #define DLM_RS_LOCKS 0x00000010 464 #define DLM_RS_LOCKS_ALL 0x00000020 465 #define DLM_RS_DONE 0x00000040 466 #define DLM_RS_DONE_ALL 0x00000080 467 468 #define DLM_RCOM_STATUS 1 469 #define DLM_RCOM_NAMES 2 470 #define DLM_RCOM_LOOKUP 3 471 #define DLM_RCOM_LOCK 4 472 #define DLM_RCOM_STATUS_REPLY 5 473 #define DLM_RCOM_NAMES_REPLY 6 474 #define DLM_RCOM_LOOKUP_REPLY 7 475 #define DLM_RCOM_LOCK_REPLY 8 476 477 struct dlm_rcom { 478 struct dlm_header rc_header; 479 __le32 rc_type; /* DLM_RCOM_ */ 480 __le32 rc_result; /* multi-purpose */ 481 __le64 rc_id; /* match reply with request */ 482 __le64 rc_seq; /* sender's ls_recover_seq */ 483 __le64 rc_seq_reply; /* remote ls_recover_seq */ 484 char rc_buf[]; 485 }; 486 487 struct dlm_opt_header { 488 __le16 t_type; 489 __le16 t_length; 490 __le32 t_pad; 491 /* need to be 8 byte aligned */ 492 char t_value[]; 493 }; 494 495 /* encapsulation header */ 496 struct dlm_opts { 497 struct dlm_header o_header; 498 uint8_t o_nextcmd; 499 uint8_t o_pad; 500 __le16 o_optlen; 501 __le32 o_pad2; 502 char o_opts[]; 503 }; 504 505 union dlm_packet { 506 struct dlm_header header; /* common to other two */ 507 struct dlm_message message; 508 struct dlm_rcom rcom; 509 struct dlm_opts opts; 510 }; 511 512 #define DLM_RSF_NEED_SLOTS 0x00000001 513 514 /* RCOM_STATUS data */ 515 struct rcom_status { 516 __le32 rs_flags; 517 __le32 rs_unused1; 518 __le64 rs_unused2; 519 }; 520 521 /* RCOM_STATUS_REPLY data */ 522 struct rcom_config { 523 __le32 rf_lvblen; 524 __le32 rf_lsflags; 525 526 /* DLM_HEADER_SLOTS adds: */ 527 __le32 rf_flags; 528 __le16 rf_our_slot; 529 __le16 rf_num_slots; 530 __le32 rf_generation; 531 __le32 rf_unused1; 532 __le64 rf_unused2; 533 }; 534 535 struct rcom_slot { 536 __le32 ro_nodeid; 537 __le16 ro_slot; 538 __le16 ro_unused1; 539 __le64 ro_unused2; 540 }; 541 542 struct rcom_lock { 543 __le32 rl_ownpid; 544 __le32 rl_lkid; 545 __le32 rl_remid; 546 __le32 rl_parent_lkid; 547 __le32 rl_parent_remid; 548 __le32 rl_exflags; 549 __le32 rl_flags; 550 __le32 rl_lvbseq; 551 __le32 rl_result; 552 int8_t rl_rqmode; 553 int8_t rl_grmode; 554 int8_t rl_status; 555 int8_t rl_asts; 556 __le16 rl_wait_type; 557 __le16 rl_namelen; 558 char rl_name[DLM_RESNAME_MAXLEN]; 559 char rl_lvb[]; 560 }; 561 562 struct dlm_ls { 563 struct list_head ls_list; /* list of lockspaces */ 564 uint32_t ls_global_id; /* global unique lockspace ID */ 565 uint32_t ls_generation; 566 uint32_t ls_exflags; 567 int ls_lvblen; 568 atomic_t ls_count; /* refcount of processes in 569 the dlm using this ls */ 570 wait_queue_head_t ls_count_wait; 571 int ls_create_count; /* create/release refcount */ 572 unsigned long ls_flags; /* LSFL_ */ 573 struct kobject ls_kobj; 574 575 struct xarray ls_lkbxa; 576 rwlock_t ls_lkbxa_lock; 577 578 /* an rsb is on rsbtl for primary locking functions, 579 and on a slow list for recovery/dump iteration */ 580 struct rhashtable ls_rsbtbl; 581 rwlock_t ls_rsbtbl_lock; /* for ls_rsbtbl and ls_slow */ 582 struct list_head ls_slow_inactive; /* to iterate rsbtbl */ 583 struct list_head ls_slow_active; /* to iterate rsbtbl */ 584 585 struct timer_list ls_scan_timer; /* based on first scan_list rsb toss_time */ 586 struct list_head ls_scan_list; /* rsbs ordered by res_toss_time */ 587 spinlock_t ls_scan_lock; 588 589 spinlock_t ls_waiters_lock; 590 struct list_head ls_waiters; /* lkbs needing a reply */ 591 592 spinlock_t ls_orphans_lock; 593 struct list_head ls_orphans; 594 595 struct list_head ls_nodes; /* current nodes in ls */ 596 struct list_head ls_nodes_gone; /* dead node list, recovery */ 597 int ls_num_nodes; /* number of nodes in ls */ 598 int ls_low_nodeid; 599 int ls_total_weight; 600 int *ls_node_array; 601 602 int ls_slot; 603 int ls_num_slots; 604 int ls_slots_size; 605 struct dlm_slot *ls_slots; 606 607 struct dlm_rsb ls_local_rsb; /* for returning errors */ 608 struct dlm_lkb ls_local_lkb; /* for returning errors */ 609 struct dlm_message ls_local_ms; /* for faking a reply */ 610 611 struct dentry *ls_debug_rsb_dentry; /* debugfs */ 612 struct dentry *ls_debug_waiters_dentry; /* debugfs */ 613 struct dentry *ls_debug_locks_dentry; /* debugfs */ 614 struct dentry *ls_debug_all_dentry; /* debugfs */ 615 struct dentry *ls_debug_toss_dentry; /* debugfs */ 616 struct dentry *ls_debug_queued_asts_dentry; /* debugfs */ 617 618 wait_queue_head_t ls_uevent_wait; /* user part of join/leave */ 619 int ls_uevent_result; 620 struct completion ls_recovery_done; 621 int ls_recovery_result; 622 623 struct miscdevice ls_device; 624 625 struct workqueue_struct *ls_callback_wq; 626 627 /* recovery related */ 628 629 spinlock_t ls_cb_lock; 630 struct list_head ls_cb_delay; /* save for queue_work later */ 631 struct task_struct *ls_recoverd_task; 632 struct mutex ls_recoverd_active; 633 spinlock_t ls_recover_lock; 634 unsigned long ls_recover_begin; /* jiffies timestamp */ 635 uint32_t ls_recover_status; /* DLM_RS_ */ 636 uint64_t ls_recover_seq; 637 struct dlm_recover *ls_recover_args; 638 struct rw_semaphore ls_in_recovery; /* block local requests */ 639 rwlock_t ls_recv_active; /* block dlm_recv */ 640 struct list_head ls_requestqueue;/* queue remote requests */ 641 rwlock_t ls_requestqueue_lock; 642 struct dlm_rcom *ls_recover_buf; 643 int ls_recover_nodeid; /* for debugging */ 644 unsigned int ls_recover_locks_in; /* for log info */ 645 uint64_t ls_rcom_seq; 646 spinlock_t ls_rcom_spin; 647 struct list_head ls_recover_list; 648 spinlock_t ls_recover_list_lock; 649 int ls_recover_list_count; 650 struct xarray ls_recover_xa; 651 spinlock_t ls_recover_xa_lock; 652 wait_queue_head_t ls_wait_general; 653 wait_queue_head_t ls_recover_lock_wait; 654 spinlock_t ls_clear_proc_locks; 655 656 struct list_head ls_masters_list; /* root resources */ 657 rwlock_t ls_masters_lock; /* protect root_list */ 658 struct list_head ls_dir_dump_list; /* root resources */ 659 rwlock_t ls_dir_dump_lock; /* protect root_list */ 660 661 const struct dlm_lockspace_ops *ls_ops; 662 void *ls_ops_arg; 663 664 struct work_struct ls_free_work; 665 666 int ls_namelen; 667 char ls_name[DLM_LOCKSPACE_LEN + 1]; 668 }; 669 670 /* 671 * LSFL_RECOVER_STOP - dlm_ls_stop() sets this to tell dlm recovery routines 672 * that they should abort what they're doing so new recovery can be started. 673 * 674 * LSFL_RECOVER_DOWN - dlm_ls_stop() sets this to tell dlm_recoverd that it 675 * should do down_write() on the in_recovery rw_semaphore. (doing down_write 676 * within dlm_ls_stop causes complaints about the lock acquired/released 677 * in different contexts.) 678 * 679 * LSFL_RECOVER_LOCK - dlm_recoverd holds the in_recovery rw_semaphore. 680 * It sets this after it is done with down_write() on the in_recovery 681 * rw_semaphore and clears it after it has released the rw_semaphore. 682 * 683 * LSFL_RECOVER_WORK - dlm_ls_start() sets this to tell dlm_recoverd that it 684 * should begin recovery of the lockspace. 685 * 686 * LSFL_RUNNING - set when normal locking activity is enabled. 687 * dlm_ls_stop() clears this to tell dlm locking routines that they should 688 * quit what they are doing so recovery can run. dlm_recoverd sets 689 * this after recovery is finished. 690 */ 691 692 #define LSFL_RECOVER_STOP 0 693 #define LSFL_RECOVER_DOWN 1 694 #define LSFL_RECOVER_LOCK 2 695 #define LSFL_RECOVER_WORK 3 696 #define LSFL_RUNNING 4 697 698 #define LSFL_RCOM_READY 5 699 #define LSFL_RCOM_WAIT 6 700 #define LSFL_UEVENT_WAIT 7 701 #define LSFL_CB_DELAY 9 702 #define LSFL_NODIR 10 703 #define LSFL_RECV_MSG_BLOCKED 11 704 #define LSFL_FS 12 705 #define LSFL_SOFTIRQ 13 706 707 #define DLM_PROC_FLAGS_CLOSING 1 708 #define DLM_PROC_FLAGS_COMPAT 2 709 710 /* locks list is kept so we can remove all a process's locks when it 711 exits (or orphan those that are persistent) */ 712 713 struct dlm_user_proc { 714 dlm_lockspace_t *lockspace; 715 unsigned long flags; /* DLM_PROC_FLAGS */ 716 struct list_head asts; 717 spinlock_t asts_spin; 718 struct list_head locks; 719 spinlock_t locks_spin; 720 struct list_head unlocking; 721 wait_queue_head_t wait; 722 }; 723 dlm_locking_stopped(struct dlm_ls * ls)724 static inline int dlm_locking_stopped(struct dlm_ls *ls) 725 { 726 return !test_bit(LSFL_RUNNING, &ls->ls_flags); 727 } 728 dlm_recovery_stopped(struct dlm_ls * ls)729 static inline int dlm_recovery_stopped(struct dlm_ls *ls) 730 { 731 return test_bit(LSFL_RECOVER_STOP, &ls->ls_flags); 732 } 733 dlm_no_directory(struct dlm_ls * ls)734 static inline int dlm_no_directory(struct dlm_ls *ls) 735 { 736 return test_bit(LSFL_NODIR, &ls->ls_flags); 737 } 738 739 /* takes a snapshot from dlm atomic flags */ dlm_flags_val(const unsigned long * addr,uint32_t min,uint32_t max)740 static inline uint32_t dlm_flags_val(const unsigned long *addr, 741 uint32_t min, uint32_t max) 742 { 743 uint32_t bit = min, val = 0; 744 745 for_each_set_bit_from(bit, addr, max + 1) { 746 val |= BIT(bit); 747 } 748 749 return val; 750 } 751 dlm_iflags_val(const struct dlm_lkb * lkb)752 static inline uint32_t dlm_iflags_val(const struct dlm_lkb *lkb) 753 { 754 return dlm_flags_val(&lkb->lkb_iflags, __DLM_IFL_MIN_BIT, 755 __DLM_IFL_MAX_BIT); 756 } 757 dlm_dflags_val(const struct dlm_lkb * lkb)758 static inline uint32_t dlm_dflags_val(const struct dlm_lkb *lkb) 759 { 760 return dlm_flags_val(&lkb->lkb_dflags, __DLM_DFL_MIN_BIT, 761 __DLM_DFL_MAX_BIT); 762 } 763 764 /* coming from UAPI header 765 * 766 * TODO: 767 * Move this to UAPI header and let other values point to them and use BIT() 768 */ 769 #define DLM_SBF_DEMOTED_BIT 0 770 #define __DLM_SBF_MIN_BIT DLM_SBF_DEMOTED_BIT 771 #define DLM_SBF_VALNOTVALID_BIT 1 772 #define DLM_SBF_ALTMODE_BIT 2 773 #define __DLM_SBF_MAX_BIT DLM_SBF_ALTMODE_BIT 774 dlm_sbflags_val(const struct dlm_lkb * lkb)775 static inline uint32_t dlm_sbflags_val(const struct dlm_lkb *lkb) 776 { 777 /* be sure the next person updates this */ 778 BUILD_BUG_ON(BIT(__DLM_SBF_MAX_BIT) != DLM_SBF_ALTMODE); 779 780 return dlm_flags_val(&lkb->lkb_sbflags, __DLM_SBF_MIN_BIT, 781 __DLM_SBF_MAX_BIT); 782 } 783 dlm_set_flags_val(unsigned long * addr,uint32_t val,uint32_t min,uint32_t max)784 static inline void dlm_set_flags_val(unsigned long *addr, uint32_t val, 785 uint32_t min, uint32_t max) 786 { 787 uint32_t bit; 788 789 for (bit = min; bit < (max + 1); bit++) { 790 if (val & BIT(bit)) 791 set_bit(bit, addr); 792 else 793 clear_bit(bit, addr); 794 } 795 } 796 dlm_set_dflags_val(struct dlm_lkb * lkb,uint32_t val)797 static inline void dlm_set_dflags_val(struct dlm_lkb *lkb, uint32_t val) 798 { 799 dlm_set_flags_val(&lkb->lkb_dflags, val, __DLM_DFL_MIN_BIT, 800 __DLM_DFL_MAX_BIT); 801 } 802 dlm_set_sbflags_val(struct dlm_lkb * lkb,uint32_t val)803 static inline void dlm_set_sbflags_val(struct dlm_lkb *lkb, uint32_t val) 804 { 805 dlm_set_flags_val(&lkb->lkb_sbflags, val, __DLM_SBF_MIN_BIT, 806 __DLM_SBF_MAX_BIT); 807 } 808 809 extern struct workqueue_struct *dlm_wq; 810 811 int dlm_plock_init(void); 812 void dlm_plock_exit(void); 813 814 #ifdef CONFIG_DLM_DEBUG 815 void dlm_register_debugfs(void); 816 void dlm_unregister_debugfs(void); 817 void dlm_create_debug_file(struct dlm_ls *ls); 818 void dlm_delete_debug_file(struct dlm_ls *ls); 819 void *dlm_create_debug_comms_file(int nodeid, void *data); 820 void dlm_delete_debug_comms_file(void *ctx); 821 #else dlm_register_debugfs(void)822 static inline void dlm_register_debugfs(void) { } dlm_unregister_debugfs(void)823 static inline void dlm_unregister_debugfs(void) { } dlm_create_debug_file(struct dlm_ls * ls)824 static inline void dlm_create_debug_file(struct dlm_ls *ls) { } dlm_delete_debug_file(struct dlm_ls * ls)825 static inline void dlm_delete_debug_file(struct dlm_ls *ls) { } dlm_create_debug_comms_file(int nodeid,void * data)826 static inline void *dlm_create_debug_comms_file(int nodeid, void *data) { return NULL; } dlm_delete_debug_comms_file(void * ctx)827 static inline void dlm_delete_debug_comms_file(void *ctx) { } 828 #endif 829 830 #endif /* __DLM_INTERNAL_DOT_H__ */ 831 832