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