1 /******************************************************************************
2 *******************************************************************************
3 **
4 ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
5 ** Copyright (C) 2004-2008 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 <asm/uaccess.h>
41
42 #include <linux/dlm.h>
43 #include "config.h"
44
45 /* Size of the temp buffer midcomms allocates on the stack.
46 We try to make this large enough so most messages fit.
47 FIXME: should sctp make this unnecessary? */
48
49 #define DLM_INBUF_LEN 148
50
51 struct dlm_ls;
52 struct dlm_lkb;
53 struct dlm_rsb;
54 struct dlm_member;
55 struct dlm_lkbtable;
56 struct dlm_rsbtable;
57 struct dlm_dirtable;
58 struct dlm_direntry;
59 struct dlm_recover;
60 struct dlm_header;
61 struct dlm_message;
62 struct dlm_rcom;
63 struct dlm_mhandle;
64
65 #define log_print(fmt, args...) \
66 printk(KERN_ERR "dlm: "fmt"\n" , ##args)
67 #define log_error(ls, fmt, args...) \
68 printk(KERN_ERR "dlm: %s: " fmt "\n", (ls)->ls_name , ##args)
69
70 #define log_debug(ls, fmt, args...) \
71 do { \
72 if (dlm_config.ci_log_debug) \
73 printk(KERN_DEBUG "dlm: %s: " fmt "\n", \
74 (ls)->ls_name , ##args); \
75 } while (0)
76
77 #define DLM_ASSERT(x, do) \
78 { \
79 if (!(x)) \
80 { \
81 printk(KERN_ERR "\nDLM: Assertion failed on line %d of file %s\n" \
82 "DLM: assertion: \"%s\"\n" \
83 "DLM: time = %lu\n", \
84 __LINE__, __FILE__, #x, jiffies); \
85 {do} \
86 printk("\n"); \
87 BUG(); \
88 panic("DLM: Record message above and reboot.\n"); \
89 } \
90 }
91
92
93 struct dlm_direntry {
94 struct list_head list;
95 uint32_t master_nodeid;
96 uint16_t length;
97 char name[1];
98 };
99
100 struct dlm_dirtable {
101 struct list_head list;
102 rwlock_t lock;
103 };
104
105 struct dlm_rsbtable {
106 struct list_head list;
107 struct list_head toss;
108 spinlock_t lock;
109 };
110
111 struct dlm_lkbtable {
112 struct list_head list;
113 rwlock_t lock;
114 uint16_t counter;
115 };
116
117 /*
118 * Lockspace member (per node in a ls)
119 */
120
121 struct dlm_member {
122 struct list_head list;
123 int nodeid;
124 int weight;
125 };
126
127 /*
128 * Save and manage recovery state for a lockspace.
129 */
130
131 struct dlm_recover {
132 struct list_head list;
133 int *nodeids; /* nodeids of all members */
134 int node_count;
135 int *new; /* nodeids of new members */
136 int new_count;
137 uint64_t seq;
138 };
139
140 /*
141 * Pass input args to second stage locking function.
142 */
143
144 struct dlm_args {
145 uint32_t flags;
146 void (*astfn) (void *astparam);
147 void *astparam;
148 void (*bastfn) (void *astparam, int mode);
149 int mode;
150 struct dlm_lksb *lksb;
151 unsigned long timeout;
152 };
153
154
155 /*
156 * Lock block
157 *
158 * A lock can be one of three types:
159 *
160 * local copy lock is mastered locally
161 * (lkb_nodeid is zero and DLM_LKF_MSTCPY is not set)
162 * process copy lock is mastered on a remote node
163 * (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is not set)
164 * master copy master node's copy of a lock owned by remote node
165 * (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is set)
166 *
167 * lkb_exflags: a copy of the most recent flags arg provided to dlm_lock or
168 * dlm_unlock. The dlm does not modify these or use any private flags in
169 * this field; it only contains DLM_LKF_ flags from dlm.h. These flags
170 * are sent as-is to the remote master when the lock is remote.
171 *
172 * lkb_flags: internal dlm flags (DLM_IFL_ prefix) from dlm_internal.h.
173 * Some internal flags are shared between the master and process nodes;
174 * these shared flags are kept in the lower two bytes. One of these
175 * flags set on the master copy will be propagated to the process copy
176 * and v.v. Other internal flags are private to the master or process
177 * node (e.g. DLM_IFL_MSTCPY). These are kept in the high two bytes.
178 *
179 * lkb_sbflags: status block flags. These flags are copied directly into
180 * the caller's lksb.sb_flags prior to the dlm_lock/dlm_unlock completion
181 * ast. All defined in dlm.h with DLM_SBF_ prefix.
182 *
183 * lkb_status: the lock status indicates which rsb queue the lock is
184 * on, grant, convert, or wait. DLM_LKSTS_ WAITING/GRANTED/CONVERT
185 *
186 * lkb_wait_type: the dlm message type (DLM_MSG_ prefix) for which a
187 * reply is needed. Only set when the lkb is on the lockspace waiters
188 * list awaiting a reply from a remote node.
189 *
190 * lkb_nodeid: when the lkb is a local copy, nodeid is 0; when the lkb
191 * is a master copy, nodeid specifies the remote lock holder, when the
192 * lkb is a process copy, the nodeid specifies the lock master.
193 */
194
195 /* lkb_ast_type */
196
197 #define AST_COMP 1
198 #define AST_BAST 2
199
200 /* lkb_status */
201
202 #define DLM_LKSTS_WAITING 1
203 #define DLM_LKSTS_GRANTED 2
204 #define DLM_LKSTS_CONVERT 3
205
206 /* lkb_flags */
207
208 #define DLM_IFL_MSTCPY 0x00010000
209 #define DLM_IFL_RESEND 0x00020000
210 #define DLM_IFL_DEAD 0x00040000
211 #define DLM_IFL_OVERLAP_UNLOCK 0x00080000
212 #define DLM_IFL_OVERLAP_CANCEL 0x00100000
213 #define DLM_IFL_ENDOFLIFE 0x00200000
214 #define DLM_IFL_WATCH_TIMEWARN 0x00400000
215 #define DLM_IFL_TIMEOUT_CANCEL 0x00800000
216 #define DLM_IFL_DEADLOCK_CANCEL 0x01000000
217 #define DLM_IFL_USER 0x00000001
218 #define DLM_IFL_ORPHAN 0x00000002
219
220 struct dlm_lkb {
221 struct dlm_rsb *lkb_resource; /* the rsb */
222 struct kref lkb_ref;
223 int lkb_nodeid; /* copied from rsb */
224 int lkb_ownpid; /* pid of lock owner */
225 uint32_t lkb_id; /* our lock ID */
226 uint32_t lkb_remid; /* lock ID on remote partner */
227 uint32_t lkb_exflags; /* external flags from caller */
228 uint32_t lkb_sbflags; /* lksb flags */
229 uint32_t lkb_flags; /* internal flags */
230 uint32_t lkb_lvbseq; /* lvb sequence number */
231
232 int8_t lkb_status; /* granted, waiting, convert */
233 int8_t lkb_rqmode; /* requested lock mode */
234 int8_t lkb_grmode; /* granted lock mode */
235 int8_t lkb_bastmode; /* requested mode */
236 int8_t lkb_highbast; /* highest mode bast sent for */
237 int8_t lkb_wait_type; /* type of reply waiting for */
238 int8_t lkb_wait_count;
239 int8_t lkb_ast_type; /* type of ast queued for */
240
241 struct list_head lkb_idtbl_list; /* lockspace lkbtbl */
242 struct list_head lkb_statequeue; /* rsb g/c/w list */
243 struct list_head lkb_rsb_lookup; /* waiting for rsb lookup */
244 struct list_head lkb_wait_reply; /* waiting for remote reply */
245 struct list_head lkb_astqueue; /* need ast to be sent */
246 struct list_head lkb_ownqueue; /* list of locks for a process */
247 struct list_head lkb_time_list;
248 ktime_t lkb_time_bast; /* for debugging */
249 ktime_t lkb_timestamp;
250 unsigned long lkb_timeout_cs;
251
252 char *lkb_lvbptr;
253 struct dlm_lksb *lkb_lksb; /* caller's status block */
254 void (*lkb_astfn) (void *astparam);
255 void (*lkb_bastfn) (void *astparam, int mode);
256 union {
257 void *lkb_astparam; /* caller's ast arg */
258 struct dlm_user_args *lkb_ua;
259 };
260 };
261
262
263 struct dlm_rsb {
264 struct dlm_ls *res_ls; /* the lockspace */
265 struct kref res_ref;
266 struct mutex res_mutex;
267 unsigned long res_flags;
268 int res_length; /* length of rsb name */
269 int res_nodeid;
270 uint32_t res_lvbseq;
271 uint32_t res_hash;
272 uint32_t res_bucket; /* rsbtbl */
273 unsigned long res_toss_time;
274 uint32_t res_first_lkid;
275 struct list_head res_lookup; /* lkbs waiting on first */
276 struct list_head res_hashchain; /* rsbtbl */
277 struct list_head res_grantqueue;
278 struct list_head res_convertqueue;
279 struct list_head res_waitqueue;
280
281 struct list_head res_root_list; /* used for recovery */
282 struct list_head res_recover_list; /* used for recovery */
283 int res_recover_locks_count;
284
285 char *res_lvbptr;
286 char res_name[1];
287 };
288
289 /* find_rsb() flags */
290
291 #define R_MASTER 1 /* only return rsb if it's a master */
292 #define R_CREATE 2 /* create/add rsb if not found */
293
294 /* rsb_flags */
295
296 enum rsb_flags {
297 RSB_MASTER_UNCERTAIN,
298 RSB_VALNOTVALID,
299 RSB_VALNOTVALID_PREV,
300 RSB_NEW_MASTER,
301 RSB_NEW_MASTER2,
302 RSB_RECOVER_CONVERT,
303 RSB_LOCKS_PURGED,
304 };
305
rsb_set_flag(struct dlm_rsb * r,enum rsb_flags flag)306 static inline void rsb_set_flag(struct dlm_rsb *r, enum rsb_flags flag)
307 {
308 __set_bit(flag, &r->res_flags);
309 }
310
rsb_clear_flag(struct dlm_rsb * r,enum rsb_flags flag)311 static inline void rsb_clear_flag(struct dlm_rsb *r, enum rsb_flags flag)
312 {
313 __clear_bit(flag, &r->res_flags);
314 }
315
rsb_flag(struct dlm_rsb * r,enum rsb_flags flag)316 static inline int rsb_flag(struct dlm_rsb *r, enum rsb_flags flag)
317 {
318 return test_bit(flag, &r->res_flags);
319 }
320
321
322 /* dlm_header is first element of all structs sent between nodes */
323
324 #define DLM_HEADER_MAJOR 0x00030000
325 #define DLM_HEADER_MINOR 0x00000000
326
327 #define DLM_MSG 1
328 #define DLM_RCOM 2
329
330 struct dlm_header {
331 uint32_t h_version;
332 uint32_t h_lockspace;
333 uint32_t h_nodeid; /* nodeid of sender */
334 uint16_t h_length;
335 uint8_t h_cmd; /* DLM_MSG, DLM_RCOM */
336 uint8_t h_pad;
337 };
338
339
340 #define DLM_MSG_REQUEST 1
341 #define DLM_MSG_CONVERT 2
342 #define DLM_MSG_UNLOCK 3
343 #define DLM_MSG_CANCEL 4
344 #define DLM_MSG_REQUEST_REPLY 5
345 #define DLM_MSG_CONVERT_REPLY 6
346 #define DLM_MSG_UNLOCK_REPLY 7
347 #define DLM_MSG_CANCEL_REPLY 8
348 #define DLM_MSG_GRANT 9
349 #define DLM_MSG_BAST 10
350 #define DLM_MSG_LOOKUP 11
351 #define DLM_MSG_REMOVE 12
352 #define DLM_MSG_LOOKUP_REPLY 13
353 #define DLM_MSG_PURGE 14
354
355 struct dlm_message {
356 struct dlm_header m_header;
357 uint32_t m_type; /* DLM_MSG_ */
358 uint32_t m_nodeid;
359 uint32_t m_pid;
360 uint32_t m_lkid; /* lkid on sender */
361 uint32_t m_remid; /* lkid on receiver */
362 uint32_t m_parent_lkid;
363 uint32_t m_parent_remid;
364 uint32_t m_exflags;
365 uint32_t m_sbflags;
366 uint32_t m_flags;
367 uint32_t m_lvbseq;
368 uint32_t m_hash;
369 int m_status;
370 int m_grmode;
371 int m_rqmode;
372 int m_bastmode;
373 int m_asts;
374 int m_result; /* 0 or -EXXX */
375 char m_extra[0]; /* name or lvb */
376 };
377
378
379 #define DLM_RS_NODES 0x00000001
380 #define DLM_RS_NODES_ALL 0x00000002
381 #define DLM_RS_DIR 0x00000004
382 #define DLM_RS_DIR_ALL 0x00000008
383 #define DLM_RS_LOCKS 0x00000010
384 #define DLM_RS_LOCKS_ALL 0x00000020
385 #define DLM_RS_DONE 0x00000040
386 #define DLM_RS_DONE_ALL 0x00000080
387
388 #define DLM_RCOM_STATUS 1
389 #define DLM_RCOM_NAMES 2
390 #define DLM_RCOM_LOOKUP 3
391 #define DLM_RCOM_LOCK 4
392 #define DLM_RCOM_STATUS_REPLY 5
393 #define DLM_RCOM_NAMES_REPLY 6
394 #define DLM_RCOM_LOOKUP_REPLY 7
395 #define DLM_RCOM_LOCK_REPLY 8
396
397 struct dlm_rcom {
398 struct dlm_header rc_header;
399 uint32_t rc_type; /* DLM_RCOM_ */
400 int rc_result; /* multi-purpose */
401 uint64_t rc_id; /* match reply with request */
402 uint64_t rc_seq; /* sender's ls_recover_seq */
403 uint64_t rc_seq_reply; /* remote ls_recover_seq */
404 char rc_buf[0];
405 };
406
407 union dlm_packet {
408 struct dlm_header header; /* common to other two */
409 struct dlm_message message;
410 struct dlm_rcom rcom;
411 };
412
413 struct rcom_config {
414 __le32 rf_lvblen;
415 __le32 rf_lsflags;
416 __le64 rf_unused;
417 };
418
419 struct rcom_lock {
420 __le32 rl_ownpid;
421 __le32 rl_lkid;
422 __le32 rl_remid;
423 __le32 rl_parent_lkid;
424 __le32 rl_parent_remid;
425 __le32 rl_exflags;
426 __le32 rl_flags;
427 __le32 rl_lvbseq;
428 __le32 rl_result;
429 int8_t rl_rqmode;
430 int8_t rl_grmode;
431 int8_t rl_status;
432 int8_t rl_asts;
433 __le16 rl_wait_type;
434 __le16 rl_namelen;
435 char rl_name[DLM_RESNAME_MAXLEN];
436 char rl_lvb[0];
437 };
438
439 struct dlm_ls {
440 struct list_head ls_list; /* list of lockspaces */
441 dlm_lockspace_t *ls_local_handle;
442 uint32_t ls_global_id; /* global unique lockspace ID */
443 uint32_t ls_exflags;
444 int ls_lvblen;
445 int ls_count; /* refcount of processes in
446 the dlm using this ls */
447 int ls_create_count; /* create/release refcount */
448 unsigned long ls_flags; /* LSFL_ */
449 unsigned long ls_scan_time;
450 struct kobject ls_kobj;
451
452 struct dlm_rsbtable *ls_rsbtbl;
453 uint32_t ls_rsbtbl_size;
454
455 struct dlm_lkbtable *ls_lkbtbl;
456 uint32_t ls_lkbtbl_size;
457
458 struct dlm_dirtable *ls_dirtbl;
459 uint32_t ls_dirtbl_size;
460
461 struct mutex ls_waiters_mutex;
462 struct list_head ls_waiters; /* lkbs needing a reply */
463
464 struct mutex ls_orphans_mutex;
465 struct list_head ls_orphans;
466
467 struct mutex ls_timeout_mutex;
468 struct list_head ls_timeout;
469
470 struct list_head ls_nodes; /* current nodes in ls */
471 struct list_head ls_nodes_gone; /* dead node list, recovery */
472 int ls_num_nodes; /* number of nodes in ls */
473 int ls_low_nodeid;
474 int ls_total_weight;
475 int *ls_node_array;
476 gfp_t ls_allocation;
477
478 struct dlm_rsb ls_stub_rsb; /* for returning errors */
479 struct dlm_lkb ls_stub_lkb; /* for returning errors */
480 struct dlm_message ls_stub_ms; /* for faking a reply */
481
482 struct dentry *ls_debug_rsb_dentry; /* debugfs */
483 struct dentry *ls_debug_waiters_dentry; /* debugfs */
484 struct dentry *ls_debug_locks_dentry; /* debugfs */
485 struct dentry *ls_debug_all_dentry; /* debugfs */
486
487 wait_queue_head_t ls_uevent_wait; /* user part of join/leave */
488 int ls_uevent_result;
489 struct completion ls_members_done;
490 int ls_members_result;
491
492 struct miscdevice ls_device;
493
494 /* recovery related */
495
496 struct timer_list ls_timer;
497 struct task_struct *ls_recoverd_task;
498 struct mutex ls_recoverd_active;
499 spinlock_t ls_recover_lock;
500 unsigned long ls_recover_begin; /* jiffies timestamp */
501 uint32_t ls_recover_status; /* DLM_RS_ */
502 uint64_t ls_recover_seq;
503 struct dlm_recover *ls_recover_args;
504 struct rw_semaphore ls_in_recovery; /* block local requests */
505 struct rw_semaphore ls_recv_active; /* block dlm_recv */
506 struct list_head ls_requestqueue;/* queue remote requests */
507 struct mutex ls_requestqueue_mutex;
508 struct dlm_rcom *ls_recover_buf;
509 int ls_recover_nodeid; /* for debugging */
510 uint64_t ls_rcom_seq;
511 spinlock_t ls_rcom_spin;
512 struct list_head ls_recover_list;
513 spinlock_t ls_recover_list_lock;
514 int ls_recover_list_count;
515 wait_queue_head_t ls_wait_general;
516 struct mutex ls_clear_proc_locks;
517
518 struct list_head ls_root_list; /* root resources */
519 struct rw_semaphore ls_root_sem; /* protect root_list */
520
521 int ls_namelen;
522 char ls_name[1];
523 };
524
525 #define LSFL_WORK 0
526 #define LSFL_RUNNING 1
527 #define LSFL_RECOVERY_STOP 2
528 #define LSFL_RCOM_READY 3
529 #define LSFL_RCOM_WAIT 4
530 #define LSFL_UEVENT_WAIT 5
531 #define LSFL_TIMEWARN 6
532
533 /* much of this is just saving user space pointers associated with the
534 lock that we pass back to the user lib with an ast */
535
536 struct dlm_user_args {
537 struct dlm_user_proc *proc; /* each process that opens the lockspace
538 device has private data
539 (dlm_user_proc) on the struct file,
540 the process's locks point back to it*/
541 struct dlm_lksb lksb;
542 int old_mode;
543 int update_user_lvb;
544 struct dlm_lksb __user *user_lksb;
545 void __user *castparam;
546 void __user *castaddr;
547 void __user *bastparam;
548 void __user *bastaddr;
549 uint64_t xid;
550 };
551
552 #define DLM_PROC_FLAGS_CLOSING 1
553 #define DLM_PROC_FLAGS_COMPAT 2
554
555 /* locks list is kept so we can remove all a process's locks when it
556 exits (or orphan those that are persistent) */
557
558 struct dlm_user_proc {
559 dlm_lockspace_t *lockspace;
560 unsigned long flags; /* DLM_PROC_FLAGS */
561 struct list_head asts;
562 spinlock_t asts_spin;
563 struct list_head locks;
564 spinlock_t locks_spin;
565 struct list_head unlocking;
566 wait_queue_head_t wait;
567 };
568
dlm_locking_stopped(struct dlm_ls * ls)569 static inline int dlm_locking_stopped(struct dlm_ls *ls)
570 {
571 return !test_bit(LSFL_RUNNING, &ls->ls_flags);
572 }
573
dlm_recovery_stopped(struct dlm_ls * ls)574 static inline int dlm_recovery_stopped(struct dlm_ls *ls)
575 {
576 return test_bit(LSFL_RECOVERY_STOP, &ls->ls_flags);
577 }
578
dlm_no_directory(struct dlm_ls * ls)579 static inline int dlm_no_directory(struct dlm_ls *ls)
580 {
581 return (ls->ls_exflags & DLM_LSFL_NODIR) ? 1 : 0;
582 }
583
584 int dlm_netlink_init(void);
585 void dlm_netlink_exit(void);
586 void dlm_timeout_warn(struct dlm_lkb *lkb);
587 int dlm_plock_init(void);
588 void dlm_plock_exit(void);
589
590 #ifdef CONFIG_DLM_DEBUG
591 int dlm_register_debugfs(void);
592 void dlm_unregister_debugfs(void);
593 int dlm_create_debug_file(struct dlm_ls *ls);
594 void dlm_delete_debug_file(struct dlm_ls *ls);
595 #else
dlm_register_debugfs(void)596 static inline int dlm_register_debugfs(void) { return 0; }
dlm_unregister_debugfs(void)597 static inline void dlm_unregister_debugfs(void) { }
dlm_create_debug_file(struct dlm_ls * ls)598 static inline int dlm_create_debug_file(struct dlm_ls *ls) { return 0; }
dlm_delete_debug_file(struct dlm_ls * ls)599 static inline void dlm_delete_debug_file(struct dlm_ls *ls) { }
600 #endif
601
602 #endif /* __DLM_INTERNAL_DOT_H__ */
603
604