summaryrefslogtreecommitdiff
path: root/fs/dlm/dlm_internal.h
blob: b670f5601fbb4f779ead4148a2d007f1026cf01f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
/******************************************************************************
*******************************************************************************
**
**  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
**  Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
**
**  This copyrighted material is made available to anyone wishing to use,
**  modify, copy, or redistribute it subject to the terms and conditions
**  of the GNU General Public License v.2.
**
*******************************************************************************
******************************************************************************/

#ifndef __DLM_INTERNAL_DOT_H__
#define __DLM_INTERNAL_DOT_H__

/*
 * This is the main header file to be included in each DLM source file.
 */

#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/ctype.h>
#include <linux/spinlock.h>
#include <linux/vmalloc.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/random.h>
#include <linux/delay.h>
#include <linux/socket.h>
#include <linux/kthread.h>
#include <linux/kobject.h>
#include <linux/kref.h>
#include <linux/kernel.h>
#include <linux/jhash.h>
#include <linux/miscdevice.h>
#include <linux/mutex.h>
#include <linux/idr.h>
#include <linux/ratelimit.h>
#include <asm/uaccess.h>

#include <linux/dlm.h>
#include "config.h"

/* Size of the temp buffer midcomms allocates on the stack.
   We try to make this large enough so most messages fit.
   FIXME: should sctp make this unnecessary? */

#define DLM_INBUF_LEN		148

struct dlm_ls;
struct dlm_lkb;
struct dlm_rsb;
struct dlm_member;
struct dlm_rsbtable;
struct dlm_recover;
struct dlm_header;
struct dlm_message;
struct dlm_rcom;
struct dlm_mhandle;

#define log_print(fmt, args...) \
	printk(KERN_ERR "dlm: "fmt"\n" , ##args)
#define log_error(ls, fmt, args...) \
	printk(KERN_ERR "dlm: %s: " fmt "\n", (ls)->ls_name , ##args)

#define log_rinfo(ls, fmt, args...) \
do { \
	if (dlm_config.ci_log_info) \
		printk(KERN_INFO "dlm: %s: " fmt "\n", \
			(ls)->ls_name, ##args); \
	else if (dlm_config.ci_log_debug) \
		printk(KERN_DEBUG "dlm: %s: " fmt "\n", \
		       (ls)->ls_name , ##args); \
} while (0)

#define log_debug(ls, fmt, args...) \
do { \
	if (dlm_config.ci_log_debug) \
		printk(KERN_DEBUG "dlm: %s: " fmt "\n", \
		       (ls)->ls_name , ##args); \
} while (0)

#define log_limit(ls, fmt, args...) \
do { \
	if (dlm_config.ci_log_debug) \
		printk_ratelimited(KERN_DEBUG "dlm: %s: " fmt "\n", \
			(ls)->ls_name , ##args); \
} while (0)

#define DLM_ASSERT(x, do) \
{ \
  if (!(x)) \
  { \
    printk(KERN_ERR "\nDLM:  Assertion failed on line %d of file %s\n" \
               "DLM:  assertion:  \"%s\"\n" \
               "DLM:  time = %lu\n", \
               __LINE__, __FILE__, #x, jiffies); \
    {do} \
    printk("\n"); \
    BUG(); \
    panic("DLM:  Record message above and reboot.\n"); \
  } \
}


#define DLM_RTF_SHRINK		0x00000001

struct dlm_rsbtable {
	struct rb_root		keep;
	struct rb_root		toss;
	spinlock_t		lock;
	uint32_t		flags;
};


/*
 * Lockspace member (per node in a ls)
 */

struct dlm_member {
	struct list_head	list;
	int			nodeid;
	int			weight;
	int			slot;
	int			slot_prev;
	int			comm_seq;
	uint32_t		generation;
};

/*
 * Save and manage recovery state for a lockspace.
 */

struct dlm_recover {
	struct list_head	list;
	struct dlm_config_node	*nodes;
	int			nodes_count;
	uint64_t		seq;
};

/*
 * Pass input args to second stage locking function.
 */

struct dlm_args {
	uint32_t		flags;
	void			(*astfn) (void *astparam);
	void			*astparam;
	void			(*bastfn) (void *astparam, int mode);
	int			mode;
	struct dlm_lksb		*lksb;
	unsigned long		timeout;
};


/*
 * Lock block
 *
 * A lock can be one of three types:
 *
 * local copy      lock is mastered locally
 *                 (lkb_nodeid is zero and DLM_LKF_MSTCPY is not set)
 * process copy    lock is mastered on a remote node
 *                 (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is not set)
 * master copy     master node's copy of a lock owned by remote node
 *                 (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is set)
 *
 * lkb_exflags: a copy of the most recent flags arg provided to dlm_lock or
 * dlm_unlock.  The dlm does not modify these or use any private flags in
 * this field; it only contains DLM_LKF_ flags from dlm.h.  These flags
 * are sent as-is to the remote master when the lock is remote.
 *
 * lkb_flags: internal dlm flags (DLM_IFL_ prefix) from dlm_internal.h.
 * Some internal flags are shared between the master and process nodes;
 * these shared flags are kept in the lower two bytes.  One of these
 * flags set on the master copy will be propagated to the process copy
 * and v.v.  Other internal flags are private to the master or process
 * node (e.g. DLM_IFL_MSTCPY).  These are kept in the high two bytes.
 *
 * lkb_sbflags: status block flags.  These flags are copied directly into
 * the caller's lksb.sb_flags prior to the dlm_lock/dlm_unlock completion
 * ast.  All defined in dlm.h with DLM_SBF_ prefix.
 *
 * lkb_status: the lock status indicates which rsb queue the lock is
 * on, grant, convert, or wait.  DLM_LKSTS_ WAITING/GRANTED/CONVERT
 *
 * lkb_wait_type: the dlm message type (DLM_MSG_ prefix) for which a
 * reply is needed.  Only set when the lkb is on the lockspace waiters
 * list awaiting a reply from a remote node.
 *
 * lkb_nodeid: when the lkb is a local copy, nodeid is 0; when the lkb
 * is a master copy, nodeid specifies the remote lock holder, when the
 * lkb is a process copy, the nodeid specifies the lock master.
 */

/* lkb_status */

#define DLM_LKSTS_WAITING	1
#define DLM_LKSTS_GRANTED	2
#define DLM_LKSTS_CONVERT	3

/* lkb_flags */

#define DLM_IFL_MSTCPY		0x00010000
#define DLM_IFL_RESEND		0x00020000
#define DLM_IFL_DEAD		0x00040000
#define DLM_IFL_OVERLAP_UNLOCK  0x00080000
#define DLM_IFL_OVERLAP_CANCEL  0x00100000
#define DLM_IFL_ENDOFLIFE	0x00200000
#define DLM_IFL_WATCH_TIMEWARN	0x00400000
#define DLM_IFL_TIMEOUT_CANCEL	0x00800000
#define DLM_IFL_DEADLOCK_CANCEL	0x01000000
#define DLM_IFL_STUB_MS		0x02000000 /* magic number for m_flags */
#define DLM_IFL_USER		0x00000001
#define DLM_IFL_ORPHAN		0x00000002

#define DLM_CALLBACKS_SIZE	6

#define DLM_CB_CAST		0x00000001
#define DLM_CB_BAST		0x00000002
#define DLM_CB_SKIP		0x00000004

struct dlm_callback {
	uint64_t		seq;
	uint32_t		flags;		/* DLM_CBF_ */
	int			sb_status;	/* copy to lksb status */
	uint8_t			sb_flags;	/* copy to lksb flags */
	int8_t			mode; /* rq mode of bast, gr mode of cast */
};

struct dlm_lkb {
	struct dlm_rsb		*lkb_resource;	/* the rsb */
	struct kref		lkb_ref;
	int			lkb_nodeid;	/* copied from rsb */
	int			lkb_ownpid;	/* pid of lock owner */
	uint32_t		lkb_id;		/* our lock ID */
	uint32_t		lkb_remid;	/* lock ID on remote partner */
	uint32_t		lkb_exflags;	/* external flags from caller */
	uint32_t		lkb_sbflags;	/* lksb flags */
	uint32_t		lkb_flags;	/* internal flags */
	uint32_t		lkb_lvbseq;	/* lvb sequence number */

	int8_t			lkb_status;     /* granted, waiting, convert */
	int8_t			lkb_rqmode;	/* requested lock mode */
	int8_t			lkb_grmode;	/* granted lock mode */
	int8_t			lkb_highbast;	/* highest mode bast sent for */

	int8_t			lkb_wait_type;	/* type of reply waiting for */
	int8_t			lkb_wait_count;
	int			lkb_wait_nodeid; /* for debugging */

	struct list_head	lkb_statequeue;	/* rsb g/c/w list */
	struct list_head	lkb_rsb_lookup;	/* waiting for rsb lookup */
	struct list_head	lkb_wait_reply;	/* waiting for remote reply */
	struct list_head	lkb_ownqueue;	/* list of locks for a process */
	struct list_head	lkb_time_list;
	ktime_t			lkb_timestamp;
	ktime_t			lkb_wait_time;
	unsigned long		lkb_timeout_cs;

	struct mutex		lkb_cb_mutex;
	struct work_struct	lkb_cb_work;
	struct list_head	lkb_cb_list; /* for ls_cb_delay or proc->asts */
	struct dlm_callback	lkb_callbacks[DLM_CALLBACKS_SIZE];
	struct dlm_callback	lkb_last_cast;
	struct dlm_callback	lkb_last_bast;
	ktime_t			lkb_last_cast_time;	/* for debugging */
	ktime_t			lkb_last_bast_time;	/* for debugging */

	uint64_t		lkb_recover_seq; /* from ls_recover_seq */

	char			*lkb_lvbptr;
	struct dlm_lksb		*lkb_lksb;      /* caller's status block */
	void			(*lkb_astfn) (void *astparam);
	void			(*lkb_bastfn) (void *astparam, int mode);
	union {
		void			*lkb_astparam;	/* caller's ast arg */
		struct dlm_user_args	*lkb_ua;
	};
};

/*
 * res_master_nodeid is "normal": 0 is unset/invalid, non-zero is the real
 * nodeid, even when nodeid is our_nodeid.
 *
 * res_nodeid is "odd": -1 is unset/invalid, zero means our_nodeid,
 * greater than zero when another nodeid.
 *
 * (TODO: remove res_nodeid and only use res_master_nodeid)
 */

struct dlm_rsb {
	struct dlm_ls		*res_ls;	/* the lockspace */
	struct kref		res_ref;
	struct mutex		res_mutex;
	unsigned long		res_flags;
	int			res_length;	/* length of rsb name */
	int			res_nodeid;
	int			res_master_nodeid;
	int			res_dir_nodeid;
	int			res_id;		/* for ls_recover_idr */
	uint32_t                res_lvbseq;
	uint32_t		res_hash;
	uint32_t		res_bucket;	/* rsbtbl */
	unsigned long		res_toss_time;
	uint32_t		res_first_lkid;
	struct list_head	res_lookup;	/* lkbs waiting on first */
	union {
		struct list_head	res_hashchain;
		struct rb_node		res_hashnode;	/* rsbtbl */
	};
	struct list_head	res_grantqueue;
	struct list_head	res_convertqueue;
	struct list_head	res_waitqueue;

	struct list_head	res_root_list;	    /* used for recovery */
	struct list_head	res_recover_list;   /* used for recovery */
	int			res_recover_locks_count;

	char			*res_lvbptr;
	char			res_name[DLM_RESNAME_MAXLEN+1];
};

/* dlm_master_lookup() flags */

#define DLM_LU_RECOVER_DIR	1
#define DLM_LU_RECOVER_MASTER	2

/* dlm_master_lookup() results */

#define DLM_LU_MATCH		1
#define DLM_LU_ADD		2

/* find_rsb() flags */

#define R_REQUEST		0x00000001
#define R_RECEIVE_REQUEST	0x00000002
#define R_RECEIVE_RECOVER	0x00000004

/* rsb_flags */

enum rsb_flags {
	RSB_MASTER_UNCERTAIN,
	RSB_VALNOTVALID,
	RSB_VALNOTVALID_PREV,
	RSB_NEW_MASTER,
	RSB_NEW_MASTER2,
	RSB_RECOVER_CONVERT,
	RSB_RECOVER_GRANT,
	RSB_RECOVER_LVB_INVAL,
};

static inline void rsb_set_flag(struct dlm_rsb *r, enum rsb_flags flag)
{
	__set_bit(flag, &r->res_flags);
}

static inline void rsb_clear_flag(struct dlm_rsb *r, enum rsb_flags flag)
{
	__clear_bit(flag, &r->res_flags);
}

static inline int rsb_flag(struct dlm_rsb *r, enum rsb_flags flag)
{
	return test_bit(flag, &r->res_flags);
}


/* dlm_header is first element of all structs sent between nodes */

#define DLM_HEADER_MAJOR	0x00030000
#define DLM_HEADER_MINOR	0x00000001

#define DLM_HEADER_SLOTS	0x00000001

#define DLM_MSG			1
#define DLM_RCOM		2

struct dlm_header {
	uint32_t		h_version;
	uint32_t		h_lockspace;
	uint32_t		h_nodeid;	/* nodeid of sender */
	uint16_t		h_length;
	uint8_t			h_cmd;		/* DLM_MSG, DLM_RCOM */
	uint8_t			h_pad;
};


#define DLM_MSG_REQUEST		1
#define DLM_MSG_CONVERT		2
#define DLM_MSG_UNLOCK		3
#define DLM_MSG_CANCEL		4
#define DLM_MSG_REQUEST_REPLY	5
#define DLM_MSG_CONVERT_REPLY	6
#define DLM_MSG_UNLOCK_REPLY	7
#define DLM_MSG_CANCEL_REPLY	8
#define DLM_MSG_GRANT		9
#define DLM_MSG_BAST		10
#define DLM_MSG_LOOKUP		11
#define DLM_MSG_REMOVE		12
#define DLM_MSG_LOOKUP_REPLY	13
#define DLM_MSG_PURGE		14

struct dlm_message {
	struct dlm_header	m_header;
	uint32_t		m_type;		/* DLM_MSG_ */
	uint32_t		m_nodeid;
	uint32_t		m_pid;
	uint32_t		m_lkid;		/* lkid on sender */
	uint32_t		m_remid;	/* lkid on receiver */
	uint32_t		m_parent_lkid;
	uint32_t		m_parent_remid;
	uint32_t		m_exflags;
	uint32_t		m_sbflags;
	uint32_t		m_flags;
	uint32_t		m_lvbseq;
	uint32_t		m_hash;
	int			m_status;
	int			m_grmode;
	int			m_rqmode;
	int			m_bastmode;
	int			m_asts;
	int			m_result;	/* 0 or -EXXX */
	char			m_extra[0];	/* name or lvb */
};


#define DLM_RS_NODES		0x00000001
#define DLM_RS_NODES_ALL	0x00000002
#define DLM_RS_DIR		0x00000004
#define DLM_RS_DIR_ALL		0x00000008
#define DLM_RS_LOCKS		0x00000010
#define DLM_RS_LOCKS_ALL	0x00000020
#define DLM_RS_DONE		0x00000040
#define DLM_RS_DONE_ALL		0x00000080

#define DLM_RCOM_STATUS		1
#define DLM_RCOM_NAMES		2
#define DLM_RCOM_LOOKUP		3
#define DLM_RCOM_LOCK		4
#define DLM_RCOM_STATUS_REPLY	5
#define DLM_RCOM_NAMES_REPLY	6
#define DLM_RCOM_LOOKUP_REPLY	7
#define DLM_RCOM_LOCK_REPLY	8

struct dlm_rcom {
	struct dlm_header	rc_header;
	uint32_t		rc_type;	/* DLM_RCOM_ */
	int			rc_result;	/* multi-purpose */
	uint64_t		rc_id;		/* match reply with request */
	uint64_t		rc_seq;		/* sender's ls_recover_seq */
	uint64_t		rc_seq_reply;	/* remote ls_recover_seq */
	char			rc_buf[0];
};

union dlm_packet {
	struct dlm_header	header;		/* common to other two */
	struct dlm_message	message;
	struct dlm_rcom		rcom;
};

#define DLM_RSF_NEED_SLOTS	0x00000001

/* RCOM_STATUS data */
struct rcom_status {
	__le32			rs_flags;
	__le32			rs_unused1;
	__le64			rs_unused2;
};

/* RCOM_STATUS_REPLY data */
struct rcom_config {
	__le32			rf_lvblen;
	__le32			rf_lsflags;

	/* DLM_HEADER_SLOTS adds: */
	__le32			rf_flags;
	__le16			rf_our_slot;
	__le16			rf_num_slots;
	__le32			rf_generation;
	__le32			rf_unused1;
	__le64			rf_unused2;
};

struct rcom_slot {
	__le32			ro_nodeid;
	__le16			ro_slot;
	__le16			ro_unused1;
	__le64			ro_unused2;
};

struct rcom_lock {
	__le32			rl_ownpid;
	__le32			rl_lkid;
	__le32			rl_remid;
	__le32			rl_parent_lkid;
	__le32			rl_parent_remid;
	__le32			rl_exflags;
	__le32			rl_flags;
	__le32			rl_lvbseq;
	__le32			rl_result;
	int8_t			rl_rqmode;
	int8_t			rl_grmode;
	int8_t			rl_status;
	int8_t			rl_asts;
	__le16			rl_wait_type;
	__le16			rl_namelen;
	char			rl_name[DLM_RESNAME_MAXLEN];
	char			rl_lvb[0];
};

/*
 * The max number of resources per rsbtbl bucket that shrink will attempt
 * to remove in each iteration.
 */

#define DLM_REMOVE_NAMES_MAX 8

struct dlm_ls {
	struct list_head	ls_list;	/* list of lockspaces */
	dlm_lockspace_t		*ls_local_handle;
	uint32_t		ls_global_id;	/* global unique lockspace ID */
	uint32_t		ls_generation;
	uint32_t		ls_exflags;
	int			ls_lvblen;
	int			ls_count;	/* refcount of processes in
						   the dlm using this ls */
	int			ls_create_count; /* create/release refcount */
	unsigned long		ls_flags;	/* LSFL_ */
	unsigned long		ls_scan_time;
	struct kobject		ls_kobj;

	struct idr		ls_lkbidr;
	spinlock_t		ls_lkbidr_spin;

	struct dlm_rsbtable	*ls_rsbtbl;
	uint32_t		ls_rsbtbl_size;

	struct mutex		ls_waiters_mutex;
	struct list_head	ls_waiters;	/* lkbs needing a reply */

	struct mutex		ls_orphans_mutex;
	struct list_head	ls_orphans;

	struct mutex		ls_timeout_mutex;
	struct list_head	ls_timeout;

	spinlock_t		ls_new_rsb_spin;
	int			ls_new_rsb_count;
	struct list_head	ls_new_rsb;	/* new rsb structs */

	spinlock_t		ls_remove_spin;
	char			ls_remove_name[DLM_RESNAME_MAXLEN+1];
	char			*ls_remove_names[DLM_REMOVE_NAMES_MAX];
	int			ls_remove_len;
	int			ls_remove_lens[DLM_REMOVE_NAMES_MAX];

	struct list_head	ls_nodes;	/* current nodes in ls */
	struct list_head	ls_nodes_gone;	/* dead node list, recovery */
	int			ls_num_nodes;	/* number of nodes in ls */
	int			ls_low_nodeid;
	int			ls_total_weight;
	int			*ls_node_array;

	int			ls_slot;
	int			ls_num_slots;
	int			ls_slots_size;
	struct dlm_slot		*ls_slots;

	struct dlm_rsb		ls_stub_rsb;	/* for returning errors */
	struct dlm_lkb		ls_stub_lkb;	/* for returning errors */
	struct dlm_message	ls_stub_ms;	/* for faking a reply */

	struct dentry		*ls_debug_rsb_dentry; /* debugfs */
	struct dentry		*ls_debug_waiters_dentry; /* debugfs */
	struct dentry		*ls_debug_locks_dentry; /* debugfs */
	struct dentry		*ls_debug_all_dentry; /* debugfs */
	struct dentry		*ls_debug_toss_dentry; /* debugfs */

	wait_queue_head_t	ls_uevent_wait;	/* user part of join/leave */
	int			ls_uevent_result;
	struct completion	ls_members_done;
	int			ls_members_result;

	struct miscdevice       ls_device;

	struct workqueue_struct	*ls_callback_wq;

	/* recovery related */

	struct mutex		ls_cb_mutex;
	struct list_head	ls_cb_delay; /* save for queue_work later */
	struct timer_list	ls_timer;
	struct task_struct	*ls_recoverd_task;
	struct mutex		ls_recoverd_active;
	spinlock_t		ls_recover_lock;
	unsigned long		ls_recover_begin; /* jiffies timestamp */
	uint32_t		ls_recover_status; /* DLM_RS_ */
	uint64_t		ls_recover_seq;
	struct dlm_recover	*ls_recover_args;
	struct rw_semaphore	ls_in_recovery;	/* block local requests */
	struct rw_semaphore	ls_recv_active;	/* block dlm_recv */
	struct list_head	ls_requestqueue;/* queue remote requests */
	struct mutex		ls_requestqueue_mutex;
	struct dlm_rcom		*ls_recover_buf;
	int			ls_recover_nodeid; /* for debugging */
	unsigned int		ls_recover_dir_sent_res; /* for log info */
	unsigned int		ls_recover_dir_sent_msg; /* for log info */
	unsigned int		ls_recover_locks_in; /* for log info */
	uint64_t		ls_rcom_seq;
	spinlock_t		ls_rcom_spin;
	struct list_head	ls_recover_list;
	spinlock_t		ls_recover_list_lock;
	int			ls_recover_list_count;
	struct idr		ls_recover_idr;
	spinlock_t		ls_recover_idr_lock;
	wait_queue_head_t	ls_wait_general;
	wait_queue_head_t	ls_recover_lock_wait;
	struct mutex		ls_clear_proc_locks;

	struct list_head	ls_root_list;	/* root resources */
	struct rw_semaphore	ls_root_sem;	/* protect root_list */

	const struct dlm_lockspace_ops *ls_ops;
	void			*ls_ops_arg;

	int			ls_namelen;
	char			ls_name[1];
};

/*
 * LSFL_RECOVER_STOP - dlm_ls_stop() sets this to tell dlm recovery routines
 * that they should abort what they're doing so new recovery can be started.
 *
 * LSFL_RECOVER_DOWN - dlm_ls_stop() sets this to tell dlm_recoverd that it
 * should do down_write() on the in_recovery rw_semaphore. (doing down_write
 * within dlm_ls_stop causes complaints about the lock acquired/released
 * in different contexts.)
 *
 * LSFL_RECOVER_LOCK - dlm_recoverd holds the in_recovery rw_semaphore.
 * It sets this after it is done with down_write() on the in_recovery
 * rw_semaphore and clears it after it has released the rw_semaphore.
 *
 * LSFL_RECOVER_WORK - dlm_ls_start() sets this to tell dlm_recoverd that it
 * should begin recovery of the lockspace.
 *
 * LSFL_RUNNING - set when normal locking activity is enabled.
 * dlm_ls_stop() clears this to tell dlm locking routines that they should
 * quit what they are doing so recovery can run.  dlm_recoverd sets
 * this after recovery is finished.
 */

#define LSFL_RECOVER_STOP	0
#define LSFL_RECOVER_DOWN	1
#define LSFL_RECOVER_LOCK	2
#define LSFL_RECOVER_WORK	3
#define LSFL_RUNNING		4

#define LSFL_RCOM_READY		5
#define LSFL_RCOM_WAIT		6
#define LSFL_UEVENT_WAIT	7
#define LSFL_TIMEWARN		8
#define LSFL_CB_DELAY		9
#define LSFL_NODIR		10

/* much of this is just saving user space pointers associated with the
   lock that we pass back to the user lib with an ast */

struct dlm_user_args {
	struct dlm_user_proc	*proc; /* each process that opens the lockspace
					  device has private data
					  (dlm_user_proc) on the struct file,
					  the process's locks point back to it*/
	struct dlm_lksb		lksb;
	struct dlm_lksb __user	*user_lksb;
	void __user		*castparam;
	void __user		*castaddr;
	void __user		*bastparam;
	void __user		*bastaddr;
	uint64_t		xid;
};

#define DLM_PROC_FLAGS_CLOSING 1
#define DLM_PROC_FLAGS_COMPAT  2

/* locks list is kept so we can remove all a process's locks when it
   exits (or orphan those that are persistent) */

struct dlm_user_proc {
	dlm_lockspace_t		*lockspace;
	unsigned long		flags; /* DLM_PROC_FLAGS */
	struct list_head	asts;
	spinlock_t		asts_spin;
	struct list_head	locks;
	spinlock_t		locks_spin;
	struct list_head	unlocking;
	wait_queue_head_t	wait;
};

static inline int dlm_locking_stopped(struct dlm_ls *ls)
{
	return !test_bit(LSFL_RUNNING, &ls->ls_flags);
}

static inline int dlm_recovery_stopped(struct dlm_ls *ls)
{
	return test_bit(LSFL_RECOVER_STOP, &ls->ls_flags);
}

static inline int dlm_no_directory(struct dlm_ls *ls)
{
	return test_bit(LSFL_NODIR, &ls->ls_flags);
}

int dlm_netlink_init(void);
void dlm_netlink_exit(void);
void dlm_timeout_warn(struct dlm_lkb *lkb);
int dlm_plock_init(void);
void dlm_plock_exit(void);

#ifdef CONFIG_DLM_DEBUG
int dlm_register_debugfs(void);
void dlm_unregister_debugfs(void);
int dlm_create_debug_file(struct dlm_ls *ls);
void dlm_delete_debug_file(struct dlm_ls *ls);
#else
static inline int dlm_register_debugfs(void) { return 0; }
static inline void dlm_unregister_debugfs(void) { }
static inline int dlm_create_debug_file(struct dlm_ls *ls) { return 0; }
static inline void dlm_delete_debug_file(struct dlm_ls *ls) { }
#endif

#endif				/* __DLM_INTERNAL_DOT_H__ */