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