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