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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