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_rinfo(ls, fmt, args...) \
70 do { \
71 if (dlm_config.ci_log_info) \
72 printk(KERN_INFO "dlm: %s: " fmt "\n", \
73 (ls)->ls_name, ##args); \
74 else if (dlm_config.ci_log_debug) \
75 printk(KERN_DEBUG "dlm: %s: " fmt "\n", \
76 (ls)->ls_name , ##args); \
77 } while (0)
78
79 #define log_debug(ls, fmt, args...) \
80 do { \
81 if (dlm_config.ci_log_debug) \
82 printk(KERN_DEBUG "dlm: %s: " fmt "\n", \
83 (ls)->ls_name , ##args); \
84 } while (0)
85
86 #define log_limit(ls, fmt, args...) \
87 do { \
88 if (dlm_config.ci_log_debug) \
89 printk_ratelimited(KERN_DEBUG "dlm: %s: " fmt "\n", \
90 (ls)->ls_name , ##args); \
91 } while (0)
92
93 #define DLM_ASSERT(x, do) \
94 { \
95 if (!(x)) \
96 { \
97 printk(KERN_ERR "\nDLM: Assertion failed on line %d of file %s\n" \
98 "DLM: assertion: \"%s\"\n" \
99 "DLM: time = %lu\n", \
100 __LINE__, __FILE__, #x, jiffies); \
101 {do} \
102 printk("\n"); \
103 BUG(); \
104 panic("DLM: Record message above and reboot.\n"); \
105 } \
106 }
107
108
109 #define DLM_RTF_SHRINK 0x00000001
110
111 struct dlm_rsbtable {
112 struct rb_root keep;
113 struct rb_root toss;
114 spinlock_t lock;
115 uint32_t flags;
116 };
117
118
119 /*
120 * Lockspace member (per node in a ls)
121 */
122
123 struct dlm_member {
124 struct list_head list;
125 int nodeid;
126 int weight;
127 int slot;
128 int slot_prev;
129 int comm_seq;
130 uint32_t generation;
131 };
132
133 /*
134 * Save and manage recovery state for a lockspace.
135 */
136
137 struct dlm_recover {
138 struct list_head list;
139 struct dlm_config_node *nodes;
140 int nodes_count;
141 uint64_t seq;
142 };
143
144 /*
145 * Pass input args to second stage locking function.
146 */
147
148 struct dlm_args {
149 uint32_t flags;
150 void (*astfn) (void *astparam);
151 void *astparam;
152 void (*bastfn) (void *astparam, int mode);
153 int mode;
154 struct dlm_lksb *lksb;
155 unsigned long timeout;
156 };
157
158
159 /*
160 * Lock block
161 *
162 * A lock can be one of three types:
163 *
164 * local copy lock is mastered locally
165 * (lkb_nodeid is zero and DLM_LKF_MSTCPY is not set)
166 * process copy lock is mastered on a remote node
167 * (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is not set)
168 * master copy master node's copy of a lock owned by remote node
169 * (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is set)
170 *
171 * lkb_exflags: a copy of the most recent flags arg provided to dlm_lock or
172 * dlm_unlock. The dlm does not modify these or use any private flags in
173 * this field; it only contains DLM_LKF_ flags from dlm.h. These flags
174 * are sent as-is to the remote master when the lock is remote.
175 *
176 * lkb_flags: internal dlm flags (DLM_IFL_ prefix) from dlm_internal.h.
177 * Some internal flags are shared between the master and process nodes;
178 * these shared flags are kept in the lower two bytes. One of these
179 * flags set on the master copy will be propagated to the process copy
180 * and v.v. Other internal flags are private to the master or process
181 * node (e.g. DLM_IFL_MSTCPY). These are kept in the high two bytes.
182 *
183 * lkb_sbflags: status block flags. These flags are copied directly into
184 * the caller's lksb.sb_flags prior to the dlm_lock/dlm_unlock completion
185 * ast. All defined in dlm.h with DLM_SBF_ prefix.
186 *
187 * lkb_status: the lock status indicates which rsb queue the lock is
188 * on, grant, convert, or wait. DLM_LKSTS_ WAITING/GRANTED/CONVERT
189 *
190 * lkb_wait_type: the dlm message type (DLM_MSG_ prefix) for which a
191 * reply is needed. Only set when the lkb is on the lockspace waiters
192 * list awaiting a reply from a remote node.
193 *
194 * lkb_nodeid: when the lkb is a local copy, nodeid is 0; when the lkb
195 * is a master copy, nodeid specifies the remote lock holder, when the
196 * lkb is a process copy, the nodeid specifies the lock master.
197 */
198
199 /* lkb_status */
200
201 #define DLM_LKSTS_WAITING 1
202 #define DLM_LKSTS_GRANTED 2
203 #define DLM_LKSTS_CONVERT 3
204
205 /* lkb_flags */
206
207 #define DLM_IFL_MSTCPY 0x00010000
208 #define DLM_IFL_RESEND 0x00020000
209 #define DLM_IFL_DEAD 0x00040000
210 #define DLM_IFL_OVERLAP_UNLOCK 0x00080000
211 #define DLM_IFL_OVERLAP_CANCEL 0x00100000
212 #define DLM_IFL_ENDOFLIFE 0x00200000
213 #define DLM_IFL_WATCH_TIMEWARN 0x00400000
214 #define DLM_IFL_TIMEOUT_CANCEL 0x00800000
215 #define DLM_IFL_DEADLOCK_CANCEL 0x01000000
216 #define DLM_IFL_STUB_MS 0x02000000 /* magic number for m_flags */
217 #define DLM_IFL_USER 0x00000001
218 #define DLM_IFL_ORPHAN 0x00000002
219
220 #define DLM_CALLBACKS_SIZE 6
221
222 #define DLM_CB_CAST 0x00000001
223 #define DLM_CB_BAST 0x00000002
224 #define DLM_CB_SKIP 0x00000004
225
226 struct dlm_callback {
227 uint64_t seq;
228 uint32_t flags; /* DLM_CBF_ */
229 int sb_status; /* copy to lksb status */
230 uint8_t sb_flags; /* copy to lksb flags */
231 int8_t mode; /* rq mode of bast, gr mode of cast */
232 };
233
234 struct dlm_lkb {
235 struct dlm_rsb *lkb_resource; /* the rsb */
236 struct kref lkb_ref;
237 int lkb_nodeid; /* copied from rsb */
238 int lkb_ownpid; /* pid of lock owner */
239 uint32_t lkb_id; /* our lock ID */
240 uint32_t lkb_remid; /* lock ID on remote partner */
241 uint32_t lkb_exflags; /* external flags from caller */
242 uint32_t lkb_sbflags; /* lksb flags */
243 uint32_t lkb_flags; /* internal flags */
244 uint32_t lkb_lvbseq; /* lvb sequence number */
245
246 int8_t lkb_status; /* granted, waiting, convert */
247 int8_t lkb_rqmode; /* requested lock mode */
248 int8_t lkb_grmode; /* granted lock mode */
249 int8_t lkb_highbast; /* highest mode bast sent for */
250
251 int8_t lkb_wait_type; /* type of reply waiting for */
252 int8_t lkb_wait_count;
253 int lkb_wait_nodeid; /* for debugging */
254
255 struct list_head lkb_statequeue; /* rsb g/c/w list */
256 struct list_head lkb_rsb_lookup; /* waiting for rsb lookup */
257 struct list_head lkb_wait_reply; /* waiting for remote reply */
258 struct list_head lkb_ownqueue; /* list of locks for a process */
259 struct list_head lkb_time_list;
260 ktime_t lkb_timestamp;
261 ktime_t lkb_wait_time;
262 unsigned long lkb_timeout_cs;
263
264 struct mutex lkb_cb_mutex;
265 struct work_struct lkb_cb_work;
266 struct list_head lkb_cb_list; /* for ls_cb_delay or proc->asts */
267 struct dlm_callback lkb_callbacks[DLM_CALLBACKS_SIZE];
268 struct dlm_callback lkb_last_cast;
269 struct dlm_callback lkb_last_bast;
270 ktime_t lkb_last_cast_time; /* for debugging */
271 ktime_t lkb_last_bast_time; /* for debugging */
272
273 uint64_t lkb_recover_seq; /* from ls_recover_seq */
274
275 char *lkb_lvbptr;
276 struct dlm_lksb *lkb_lksb; /* caller's status block */
277 void (*lkb_astfn) (void *astparam);
278 void (*lkb_bastfn) (void *astparam, int mode);
279 union {
280 void *lkb_astparam; /* caller's ast arg */
281 struct dlm_user_args *lkb_ua;
282 };
283 };
284
285 /*
286 * res_master_nodeid is "normal": 0 is unset/invalid, non-zero is the real
287 * nodeid, even when nodeid is our_nodeid.
288 *
289 * res_nodeid is "odd": -1 is unset/invalid, zero means our_nodeid,
290 * greater than zero when another nodeid.
291 *
292 * (TODO: remove res_nodeid and only use res_master_nodeid)
293 */
294
295 struct dlm_rsb {
296 struct dlm_ls *res_ls; /* the lockspace */
297 struct kref res_ref;
298 struct mutex res_mutex;
299 unsigned long res_flags;
300 int res_length; /* length of rsb name */
301 int res_nodeid;
302 int res_master_nodeid;
303 int res_dir_nodeid;
304 int res_id; /* for ls_recover_idr */
305 uint32_t res_lvbseq;
306 uint32_t res_hash;
307 uint32_t res_bucket; /* rsbtbl */
308 unsigned long res_toss_time;
309 uint32_t res_first_lkid;
310 struct list_head res_lookup; /* lkbs waiting on first */
311 union {
312 struct list_head res_hashchain;
313 struct rb_node res_hashnode; /* rsbtbl */
314 };
315 struct list_head res_grantqueue;
316 struct list_head res_convertqueue;
317 struct list_head res_waitqueue;
318
319 struct list_head res_root_list; /* used for recovery */
320 struct list_head res_recover_list; /* used for recovery */
321 int res_recover_locks_count;
322
323 char *res_lvbptr;
324 char res_name[DLM_RESNAME_MAXLEN+1];
325 };
326
327 /* dlm_master_lookup() flags */
328
329 #define DLM_LU_RECOVER_DIR 1
330 #define DLM_LU_RECOVER_MASTER 2
331
332 /* dlm_master_lookup() results */
333
334 #define DLM_LU_MATCH 1
335 #define DLM_LU_ADD 2
336
337 /* find_rsb() flags */
338
339 #define R_REQUEST 0x00000001
340 #define R_RECEIVE_REQUEST 0x00000002
341 #define R_RECEIVE_RECOVER 0x00000004
342
343 /* rsb_flags */
344
345 enum rsb_flags {
346 RSB_MASTER_UNCERTAIN,
347 RSB_VALNOTVALID,
348 RSB_VALNOTVALID_PREV,
349 RSB_NEW_MASTER,
350 RSB_NEW_MASTER2,
351 RSB_RECOVER_CONVERT,
352 RSB_RECOVER_GRANT,
353 RSB_RECOVER_LVB_INVAL,
354 };
355
rsb_set_flag(struct dlm_rsb * r,enum rsb_flags flag)356 static inline void rsb_set_flag(struct dlm_rsb *r, enum rsb_flags flag)
357 {
358 __set_bit(flag, &r->res_flags);
359 }
360
rsb_clear_flag(struct dlm_rsb * r,enum rsb_flags flag)361 static inline void rsb_clear_flag(struct dlm_rsb *r, enum rsb_flags flag)
362 {
363 __clear_bit(flag, &r->res_flags);
364 }
365
rsb_flag(struct dlm_rsb * r,enum rsb_flags flag)366 static inline int rsb_flag(struct dlm_rsb *r, enum rsb_flags flag)
367 {
368 return test_bit(flag, &r->res_flags);
369 }
370
371
372 /* dlm_header is first element of all structs sent between nodes */
373
374 #define DLM_HEADER_MAJOR 0x00030000
375 #define DLM_HEADER_MINOR 0x00000001
376
377 #define DLM_HEADER_SLOTS 0x00000001
378
379 #define DLM_MSG 1
380 #define DLM_RCOM 2
381
382 struct dlm_header {
383 uint32_t h_version;
384 uint32_t h_lockspace;
385 uint32_t h_nodeid; /* nodeid of sender */
386 uint16_t h_length;
387 uint8_t h_cmd; /* DLM_MSG, DLM_RCOM */
388 uint8_t h_pad;
389 };
390
391
392 #define DLM_MSG_REQUEST 1
393 #define DLM_MSG_CONVERT 2
394 #define DLM_MSG_UNLOCK 3
395 #define DLM_MSG_CANCEL 4
396 #define DLM_MSG_REQUEST_REPLY 5
397 #define DLM_MSG_CONVERT_REPLY 6
398 #define DLM_MSG_UNLOCK_REPLY 7
399 #define DLM_MSG_CANCEL_REPLY 8
400 #define DLM_MSG_GRANT 9
401 #define DLM_MSG_BAST 10
402 #define DLM_MSG_LOOKUP 11
403 #define DLM_MSG_REMOVE 12
404 #define DLM_MSG_LOOKUP_REPLY 13
405 #define DLM_MSG_PURGE 14
406
407 struct dlm_message {
408 struct dlm_header m_header;
409 uint32_t m_type; /* DLM_MSG_ */
410 uint32_t m_nodeid;
411 uint32_t m_pid;
412 uint32_t m_lkid; /* lkid on sender */
413 uint32_t m_remid; /* lkid on receiver */
414 uint32_t m_parent_lkid;
415 uint32_t m_parent_remid;
416 uint32_t m_exflags;
417 uint32_t m_sbflags;
418 uint32_t m_flags;
419 uint32_t m_lvbseq;
420 uint32_t m_hash;
421 int m_status;
422 int m_grmode;
423 int m_rqmode;
424 int m_bastmode;
425 int m_asts;
426 int m_result; /* 0 or -EXXX */
427 char m_extra[0]; /* name or lvb */
428 };
429
430
431 #define DLM_RS_NODES 0x00000001
432 #define DLM_RS_NODES_ALL 0x00000002
433 #define DLM_RS_DIR 0x00000004
434 #define DLM_RS_DIR_ALL 0x00000008
435 #define DLM_RS_LOCKS 0x00000010
436 #define DLM_RS_LOCKS_ALL 0x00000020
437 #define DLM_RS_DONE 0x00000040
438 #define DLM_RS_DONE_ALL 0x00000080
439
440 #define DLM_RCOM_STATUS 1
441 #define DLM_RCOM_NAMES 2
442 #define DLM_RCOM_LOOKUP 3
443 #define DLM_RCOM_LOCK 4
444 #define DLM_RCOM_STATUS_REPLY 5
445 #define DLM_RCOM_NAMES_REPLY 6
446 #define DLM_RCOM_LOOKUP_REPLY 7
447 #define DLM_RCOM_LOCK_REPLY 8
448
449 struct dlm_rcom {
450 struct dlm_header rc_header;
451 uint32_t rc_type; /* DLM_RCOM_ */
452 int rc_result; /* multi-purpose */
453 uint64_t rc_id; /* match reply with request */
454 uint64_t rc_seq; /* sender's ls_recover_seq */
455 uint64_t rc_seq_reply; /* remote ls_recover_seq */
456 char rc_buf[0];
457 };
458
459 union dlm_packet {
460 struct dlm_header header; /* common to other two */
461 struct dlm_message message;
462 struct dlm_rcom rcom;
463 };
464
465 #define DLM_RSF_NEED_SLOTS 0x00000001
466
467 /* RCOM_STATUS data */
468 struct rcom_status {
469 __le32 rs_flags;
470 __le32 rs_unused1;
471 __le64 rs_unused2;
472 };
473
474 /* RCOM_STATUS_REPLY data */
475 struct rcom_config {
476 __le32 rf_lvblen;
477 __le32 rf_lsflags;
478
479 /* DLM_HEADER_SLOTS adds: */
480 __le32 rf_flags;
481 __le16 rf_our_slot;
482 __le16 rf_num_slots;
483 __le32 rf_generation;
484 __le32 rf_unused1;
485 __le64 rf_unused2;
486 };
487
488 struct rcom_slot {
489 __le32 ro_nodeid;
490 __le16 ro_slot;
491 __le16 ro_unused1;
492 __le64 ro_unused2;
493 };
494
495 struct rcom_lock {
496 __le32 rl_ownpid;
497 __le32 rl_lkid;
498 __le32 rl_remid;
499 __le32 rl_parent_lkid;
500 __le32 rl_parent_remid;
501 __le32 rl_exflags;
502 __le32 rl_flags;
503 __le32 rl_lvbseq;
504 __le32 rl_result;
505 int8_t rl_rqmode;
506 int8_t rl_grmode;
507 int8_t rl_status;
508 int8_t rl_asts;
509 __le16 rl_wait_type;
510 __le16 rl_namelen;
511 char rl_name[DLM_RESNAME_MAXLEN];
512 char rl_lvb[0];
513 };
514
515 /*
516 * The max number of resources per rsbtbl bucket that shrink will attempt
517 * to remove in each iteration.
518 */
519
520 #define DLM_REMOVE_NAMES_MAX 8
521
522 struct dlm_ls {
523 struct list_head ls_list; /* list of lockspaces */
524 dlm_lockspace_t *ls_local_handle;
525 uint32_t ls_global_id; /* global unique lockspace ID */
526 uint32_t ls_generation;
527 uint32_t ls_exflags;
528 int ls_lvblen;
529 int ls_count; /* refcount of processes in
530 the dlm using this ls */
531 int ls_create_count; /* create/release refcount */
532 unsigned long ls_flags; /* LSFL_ */
533 unsigned long ls_scan_time;
534 struct kobject ls_kobj;
535
536 struct idr ls_lkbidr;
537 spinlock_t ls_lkbidr_spin;
538
539 struct dlm_rsbtable *ls_rsbtbl;
540 uint32_t ls_rsbtbl_size;
541
542 struct mutex ls_waiters_mutex;
543 struct list_head ls_waiters; /* lkbs needing a reply */
544
545 struct mutex ls_orphans_mutex;
546 struct list_head ls_orphans;
547
548 struct mutex ls_timeout_mutex;
549 struct list_head ls_timeout;
550
551 spinlock_t ls_new_rsb_spin;
552 int ls_new_rsb_count;
553 struct list_head ls_new_rsb; /* new rsb structs */
554
555 spinlock_t ls_remove_spin;
556 char ls_remove_name[DLM_RESNAME_MAXLEN+1];
557 char *ls_remove_names[DLM_REMOVE_NAMES_MAX];
558 int ls_remove_len;
559 int ls_remove_lens[DLM_REMOVE_NAMES_MAX];
560
561 struct list_head ls_nodes; /* current nodes in ls */
562 struct list_head ls_nodes_gone; /* dead node list, recovery */
563 int ls_num_nodes; /* number of nodes in ls */
564 int ls_low_nodeid;
565 int ls_total_weight;
566 int *ls_node_array;
567
568 int ls_slot;
569 int ls_num_slots;
570 int ls_slots_size;
571 struct dlm_slot *ls_slots;
572
573 struct dlm_rsb ls_stub_rsb; /* for returning errors */
574 struct dlm_lkb ls_stub_lkb; /* for returning errors */
575 struct dlm_message ls_stub_ms; /* for faking a reply */
576
577 struct dentry *ls_debug_rsb_dentry; /* debugfs */
578 struct dentry *ls_debug_waiters_dentry; /* debugfs */
579 struct dentry *ls_debug_locks_dentry; /* debugfs */
580 struct dentry *ls_debug_all_dentry; /* debugfs */
581 struct dentry *ls_debug_toss_dentry; /* debugfs */
582
583 wait_queue_head_t ls_uevent_wait; /* user part of join/leave */
584 int ls_uevent_result;
585 struct completion ls_members_done;
586 int ls_members_result;
587
588 struct miscdevice ls_device;
589
590 struct workqueue_struct *ls_callback_wq;
591
592 /* recovery related */
593
594 struct mutex ls_cb_mutex;
595 struct list_head ls_cb_delay; /* save for queue_work later */
596 struct timer_list ls_timer;
597 struct task_struct *ls_recoverd_task;
598 struct mutex ls_recoverd_active;
599 spinlock_t ls_recover_lock;
600 unsigned long ls_recover_begin; /* jiffies timestamp */
601 uint32_t ls_recover_status; /* DLM_RS_ */
602 uint64_t ls_recover_seq;
603 struct dlm_recover *ls_recover_args;
604 struct rw_semaphore ls_in_recovery; /* block local requests */
605 struct rw_semaphore ls_recv_active; /* block dlm_recv */
606 struct list_head ls_requestqueue;/* queue remote requests */
607 struct mutex ls_requestqueue_mutex;
608 struct dlm_rcom *ls_recover_buf;
609 int ls_recover_nodeid; /* for debugging */
610 unsigned int ls_recover_dir_sent_res; /* for log info */
611 unsigned int ls_recover_dir_sent_msg; /* for log info */
612 unsigned int ls_recover_locks_in; /* for log info */
613 uint64_t ls_rcom_seq;
614 spinlock_t ls_rcom_spin;
615 struct list_head ls_recover_list;
616 spinlock_t ls_recover_list_lock;
617 int ls_recover_list_count;
618 struct idr ls_recover_idr;
619 spinlock_t ls_recover_idr_lock;
620 wait_queue_head_t ls_wait_general;
621 wait_queue_head_t ls_recover_lock_wait;
622 struct mutex ls_clear_proc_locks;
623
624 struct list_head ls_root_list; /* root resources */
625 struct rw_semaphore ls_root_sem; /* protect root_list */
626
627 const struct dlm_lockspace_ops *ls_ops;
628 void *ls_ops_arg;
629
630 int ls_namelen;
631 char ls_name[1];
632 };
633
634 /*
635 * LSFL_RECOVER_STOP - dlm_ls_stop() sets this to tell dlm recovery routines
636 * that they should abort what they're doing so new recovery can be started.
637 *
638 * LSFL_RECOVER_DOWN - dlm_ls_stop() sets this to tell dlm_recoverd that it
639 * should do down_write() on the in_recovery rw_semaphore. (doing down_write
640 * within dlm_ls_stop causes complaints about the lock acquired/released
641 * in different contexts.)
642 *
643 * LSFL_RECOVER_LOCK - dlm_recoverd holds the in_recovery rw_semaphore.
644 * It sets this after it is done with down_write() on the in_recovery
645 * rw_semaphore and clears it after it has released the rw_semaphore.
646 *
647 * LSFL_RECOVER_WORK - dlm_ls_start() sets this to tell dlm_recoverd that it
648 * should begin recovery of the lockspace.
649 *
650 * LSFL_RUNNING - set when normal locking activity is enabled.
651 * dlm_ls_stop() clears this to tell dlm locking routines that they should
652 * quit what they are doing so recovery can run. dlm_recoverd sets
653 * this after recovery is finished.
654 */
655
656 #define LSFL_RECOVER_STOP 0
657 #define LSFL_RECOVER_DOWN 1
658 #define LSFL_RECOVER_LOCK 2
659 #define LSFL_RECOVER_WORK 3
660 #define LSFL_RUNNING 4
661
662 #define LSFL_RCOM_READY 5
663 #define LSFL_RCOM_WAIT 6
664 #define LSFL_UEVENT_WAIT 7
665 #define LSFL_TIMEWARN 8
666 #define LSFL_CB_DELAY 9
667 #define LSFL_NODIR 10
668
669 /* much of this is just saving user space pointers associated with the
670 lock that we pass back to the user lib with an ast */
671
672 struct dlm_user_args {
673 struct dlm_user_proc *proc; /* each process that opens the lockspace
674 device has private data
675 (dlm_user_proc) on the struct file,
676 the process's locks point back to it*/
677 struct dlm_lksb lksb;
678 struct dlm_lksb __user *user_lksb;
679 void __user *castparam;
680 void __user *castaddr;
681 void __user *bastparam;
682 void __user *bastaddr;
683 uint64_t xid;
684 };
685
686 #define DLM_PROC_FLAGS_CLOSING 1
687 #define DLM_PROC_FLAGS_COMPAT 2
688
689 /* locks list is kept so we can remove all a process's locks when it
690 exits (or orphan those that are persistent) */
691
692 struct dlm_user_proc {
693 dlm_lockspace_t *lockspace;
694 unsigned long flags; /* DLM_PROC_FLAGS */
695 struct list_head asts;
696 spinlock_t asts_spin;
697 struct list_head locks;
698 spinlock_t locks_spin;
699 struct list_head unlocking;
700 wait_queue_head_t wait;
701 };
702
dlm_locking_stopped(struct dlm_ls * ls)703 static inline int dlm_locking_stopped(struct dlm_ls *ls)
704 {
705 return !test_bit(LSFL_RUNNING, &ls->ls_flags);
706 }
707
dlm_recovery_stopped(struct dlm_ls * ls)708 static inline int dlm_recovery_stopped(struct dlm_ls *ls)
709 {
710 return test_bit(LSFL_RECOVER_STOP, &ls->ls_flags);
711 }
712
dlm_no_directory(struct dlm_ls * ls)713 static inline int dlm_no_directory(struct dlm_ls *ls)
714 {
715 return test_bit(LSFL_NODIR, &ls->ls_flags);
716 }
717
718 int dlm_netlink_init(void);
719 void dlm_netlink_exit(void);
720 void dlm_timeout_warn(struct dlm_lkb *lkb);
721 int dlm_plock_init(void);
722 void dlm_plock_exit(void);
723
724 #ifdef CONFIG_DLM_DEBUG
725 int dlm_register_debugfs(void);
726 void dlm_unregister_debugfs(void);
727 int dlm_create_debug_file(struct dlm_ls *ls);
728 void dlm_delete_debug_file(struct dlm_ls *ls);
729 #else
dlm_register_debugfs(void)730 static inline int dlm_register_debugfs(void) { return 0; }
dlm_unregister_debugfs(void)731 static inline void dlm_unregister_debugfs(void) { }
dlm_create_debug_file(struct dlm_ls * ls)732 static inline int dlm_create_debug_file(struct dlm_ls *ls) { return 0; }
dlm_delete_debug_file(struct dlm_ls * ls)733 static inline void dlm_delete_debug_file(struct dlm_ls *ls) { }
734 #endif
735
736 #endif /* __DLM_INTERNAL_DOT_H__ */
737
738