1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /******************************************************************************
3 *******************************************************************************
4 **
5 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
6 **  Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
7 **
8 **
9 *******************************************************************************
10 ******************************************************************************/
11 
12 #ifndef __DLM_INTERNAL_DOT_H__
13 #define __DLM_INTERNAL_DOT_H__
14 
15 /*
16  * This is the main header file to be included in each DLM source file.
17  */
18 
19 #include <linux/slab.h>
20 #include <linux/sched.h>
21 #include <linux/types.h>
22 #include <linux/ctype.h>
23 #include <linux/spinlock.h>
24 #include <linux/vmalloc.h>
25 #include <linux/list.h>
26 #include <linux/errno.h>
27 #include <linux/random.h>
28 #include <linux/delay.h>
29 #include <linux/socket.h>
30 #include <linux/kthread.h>
31 #include <linux/kobject.h>
32 #include <linux/kref.h>
33 #include <linux/kernel.h>
34 #include <linux/jhash.h>
35 #include <linux/miscdevice.h>
36 #include <linux/mutex.h>
37 #include <linux/idr.h>
38 #include <linux/ratelimit.h>
39 #include <linux/uaccess.h>
40 
41 #include <linux/dlm.h>
42 #include "config.h"
43 
44 struct dlm_ls;
45 struct dlm_lkb;
46 struct dlm_rsb;
47 struct dlm_member;
48 struct dlm_rsbtable;
49 struct dlm_recover;
50 struct dlm_header;
51 struct dlm_message;
52 struct dlm_rcom;
53 struct dlm_mhandle;
54 struct dlm_msg;
55 
56 #define log_print(fmt, args...) \
57 	printk(KERN_ERR "dlm: "fmt"\n" , ##args)
58 #define log_print_ratelimited(fmt, args...) \
59 	printk_ratelimited(KERN_ERR "dlm: "fmt"\n", ##args)
60 #define log_error(ls, fmt, args...) \
61 	printk(KERN_ERR "dlm: %s: " fmt "\n", (ls)->ls_name , ##args)
62 
63 #define log_rinfo(ls, fmt, args...) \
64 do { \
65 	if (dlm_config.ci_log_info) \
66 		printk(KERN_INFO "dlm: %s: " fmt "\n", \
67 			(ls)->ls_name, ##args); \
68 	else if (dlm_config.ci_log_debug) \
69 		printk(KERN_DEBUG "dlm: %s: " fmt "\n", \
70 		       (ls)->ls_name , ##args); \
71 } while (0)
72 
73 #define log_debug(ls, fmt, args...) \
74 do { \
75 	if (dlm_config.ci_log_debug) \
76 		printk(KERN_DEBUG "dlm: %s: " fmt "\n", \
77 		       (ls)->ls_name , ##args); \
78 } while (0)
79 
80 #define log_limit(ls, fmt, args...) \
81 do { \
82 	if (dlm_config.ci_log_debug) \
83 		printk_ratelimited(KERN_DEBUG "dlm: %s: " fmt "\n", \
84 			(ls)->ls_name , ##args); \
85 } while (0)
86 
87 #define DLM_ASSERT(x, do) \
88 { \
89   if (!(x)) \
90   { \
91     printk(KERN_ERR "\nDLM:  Assertion failed on line %d of file %s\n" \
92                "DLM:  assertion:  \"%s\"\n" \
93                "DLM:  time = %lu\n", \
94                __LINE__, __FILE__, #x, jiffies); \
95     {do} \
96     printk("\n"); \
97     panic("DLM:  Record message above and reboot.\n"); \
98   } \
99 }
100 
101 
102 #define DLM_RTF_SHRINK		0x00000001
103 
104 struct dlm_rsbtable {
105 	struct rb_root		keep;
106 	struct rb_root		toss;
107 	spinlock_t		lock;
108 	uint32_t		flags;
109 };
110 
111 
112 /*
113  * Lockspace member (per node in a ls)
114  */
115 
116 struct dlm_member {
117 	struct list_head	list;
118 	int			nodeid;
119 	int			weight;
120 	int			slot;
121 	int			slot_prev;
122 	int			comm_seq;
123 	uint32_t		generation;
124 };
125 
126 /*
127  * Save and manage recovery state for a lockspace.
128  */
129 
130 struct dlm_recover {
131 	struct list_head	list;
132 	struct dlm_config_node	*nodes;
133 	int			nodes_count;
134 	uint64_t		seq;
135 };
136 
137 /*
138  * Pass input args to second stage locking function.
139  */
140 
141 struct dlm_args {
142 	uint32_t		flags;
143 	void			(*astfn) (void *astparam);
144 	void			*astparam;
145 	void			(*bastfn) (void *astparam, int mode);
146 	int			mode;
147 	struct dlm_lksb		*lksb;
148 #ifdef CONFIG_DLM_DEPRECATED_API
149 	unsigned long		timeout;
150 #endif
151 };
152 
153 
154 /*
155  * Lock block
156  *
157  * A lock can be one of three types:
158  *
159  * local copy      lock is mastered locally
160  *                 (lkb_nodeid is zero and DLM_LKF_MSTCPY is not set)
161  * process copy    lock is mastered on a remote node
162  *                 (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is not set)
163  * master copy     master node's copy of a lock owned by remote node
164  *                 (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is set)
165  *
166  * lkb_exflags: a copy of the most recent flags arg provided to dlm_lock or
167  * dlm_unlock.  The dlm does not modify these or use any private flags in
168  * this field; it only contains DLM_LKF_ flags from dlm.h.  These flags
169  * are sent as-is to the remote master when the lock is remote.
170  *
171  * lkb_flags: internal dlm flags (DLM_IFL_ prefix) from dlm_internal.h.
172  * Some internal flags are shared between the master and process nodes;
173  * these shared flags are kept in the lower two bytes.  One of these
174  * flags set on the master copy will be propagated to the process copy
175  * and v.v.  Other internal flags are private to the master or process
176  * node (e.g. DLM_IFL_MSTCPY).  These are kept in the high two bytes.
177  *
178  * lkb_sbflags: status block flags.  These flags are copied directly into
179  * the caller's lksb.sb_flags prior to the dlm_lock/dlm_unlock completion
180  * ast.  All defined in dlm.h with DLM_SBF_ prefix.
181  *
182  * lkb_status: the lock status indicates which rsb queue the lock is
183  * on, grant, convert, or wait.  DLM_LKSTS_ WAITING/GRANTED/CONVERT
184  *
185  * lkb_wait_type: the dlm message type (DLM_MSG_ prefix) for which a
186  * reply is needed.  Only set when the lkb is on the lockspace waiters
187  * list awaiting a reply from a remote node.
188  *
189  * lkb_nodeid: when the lkb is a local copy, nodeid is 0; when the lkb
190  * is a master copy, nodeid specifies the remote lock holder, when the
191  * lkb is a process copy, the nodeid specifies the lock master.
192  */
193 
194 /* lkb_status */
195 
196 #define DLM_LKSTS_WAITING	1
197 #define DLM_LKSTS_GRANTED	2
198 #define DLM_LKSTS_CONVERT	3
199 
200 /* lkb_flags */
201 
202 #define DLM_IFL_MSTCPY		0x00010000
203 #define DLM_IFL_RESEND		0x00020000
204 #define DLM_IFL_DEAD		0x00040000
205 #define DLM_IFL_OVERLAP_UNLOCK  0x00080000
206 #define DLM_IFL_OVERLAP_CANCEL  0x00100000
207 #define DLM_IFL_ENDOFLIFE	0x00200000
208 #ifdef CONFIG_DLM_DEPRECATED_API
209 #define DLM_IFL_WATCH_TIMEWARN	0x00400000
210 #define DLM_IFL_TIMEOUT_CANCEL	0x00800000
211 #endif
212 #define DLM_IFL_DEADLOCK_CANCEL	0x01000000
213 #define DLM_IFL_STUB_MS		0x02000000 /* magic number for m_flags */
214 #define DLM_IFL_CB_PENDING	0x04000000
215 /* least significant 2 bytes are message changed, they are full transmitted
216  * but at receive side only the 2 bytes LSB will be set.
217  *
218  * Even wireshark dlm dissector does only evaluate the lower bytes and note
219  * that they may not be used on transceiver side, we assume the higher bytes
220  * are for internal use or reserved so long they are not parsed on receiver
221  * side.
222  */
223 #define DLM_IFL_USER		0x00000001
224 #define DLM_IFL_ORPHAN		0x00000002
225 
226 #define DLM_CB_CAST		0x00000001
227 #define DLM_CB_BAST		0x00000002
228 
229 struct dlm_callback {
230 	uint32_t		flags;		/* DLM_CBF_ */
231 	int			sb_status;	/* copy to lksb status */
232 	uint8_t			sb_flags;	/* copy to lksb flags */
233 	int8_t			mode; /* rq mode of bast, gr mode of cast */
234 
235 	struct list_head	list;
236 	struct kref		ref;
237 };
238 
239 struct dlm_lkb {
240 	struct dlm_rsb		*lkb_resource;	/* the rsb */
241 	struct kref		lkb_ref;
242 	int			lkb_nodeid;	/* copied from rsb */
243 	int			lkb_ownpid;	/* pid of lock owner */
244 	uint32_t		lkb_id;		/* our lock ID */
245 	uint32_t		lkb_remid;	/* lock ID on remote partner */
246 	uint32_t		lkb_exflags;	/* external flags from caller */
247 	uint32_t		lkb_sbflags;	/* lksb flags */
248 	uint32_t		lkb_flags;	/* internal flags */
249 	uint32_t		lkb_lvbseq;	/* lvb sequence number */
250 
251 	int8_t			lkb_status;     /* granted, waiting, convert */
252 	int8_t			lkb_rqmode;	/* requested lock mode */
253 	int8_t			lkb_grmode;	/* granted lock mode */
254 	int8_t			lkb_highbast;	/* highest mode bast sent for */
255 
256 	int8_t			lkb_wait_type;	/* type of reply waiting for */
257 	int8_t			lkb_wait_count;
258 	int			lkb_wait_nodeid; /* for debugging */
259 
260 	struct list_head	lkb_statequeue;	/* rsb g/c/w list */
261 	struct list_head	lkb_rsb_lookup;	/* waiting for rsb lookup */
262 	struct list_head	lkb_wait_reply;	/* waiting for remote reply */
263 	struct list_head	lkb_ownqueue;	/* list of locks for a process */
264 	ktime_t			lkb_timestamp;
265 
266 #ifdef CONFIG_DLM_DEPRECATED_API
267 	struct list_head	lkb_time_list;
268 	unsigned long		lkb_timeout_cs;
269 #endif
270 
271 	spinlock_t		lkb_cb_lock;
272 	struct work_struct	lkb_cb_work;
273 	struct list_head	lkb_cb_list; /* for ls_cb_delay or proc->asts */
274 	struct list_head	lkb_callbacks;
275 	struct dlm_callback	*lkb_last_cast;
276 	struct dlm_callback	*lkb_last_cb;
277 	int			lkb_last_bast_mode;
278 	ktime_t			lkb_last_cast_time;	/* for debugging */
279 	ktime_t			lkb_last_bast_time;	/* for debugging */
280 
281 	uint64_t		lkb_recover_seq; /* from ls_recover_seq */
282 
283 	char			*lkb_lvbptr;
284 	struct dlm_lksb		*lkb_lksb;      /* caller's status block */
285 	void			(*lkb_astfn) (void *astparam);
286 	void			(*lkb_bastfn) (void *astparam, int mode);
287 	union {
288 		void			*lkb_astparam;	/* caller's ast arg */
289 		struct dlm_user_args	*lkb_ua;
290 	};
291 };
292 
293 /*
294  * res_master_nodeid is "normal": 0 is unset/invalid, non-zero is the real
295  * nodeid, even when nodeid is our_nodeid.
296  *
297  * res_nodeid is "odd": -1 is unset/invalid, zero means our_nodeid,
298  * greater than zero when another nodeid.
299  *
300  * (TODO: remove res_nodeid and only use res_master_nodeid)
301  */
302 
303 struct dlm_rsb {
304 	struct dlm_ls		*res_ls;	/* the lockspace */
305 	struct kref		res_ref;
306 	struct mutex		res_mutex;
307 	unsigned long		res_flags;
308 	int			res_length;	/* length of rsb name */
309 	int			res_nodeid;
310 	int			res_master_nodeid;
311 	int			res_dir_nodeid;
312 	int			res_id;		/* for ls_recover_idr */
313 	uint32_t                res_lvbseq;
314 	uint32_t		res_hash;
315 	uint32_t		res_bucket;	/* rsbtbl */
316 	unsigned long		res_toss_time;
317 	uint32_t		res_first_lkid;
318 	struct list_head	res_lookup;	/* lkbs waiting on first */
319 	union {
320 		struct list_head	res_hashchain;
321 		struct rb_node		res_hashnode;	/* rsbtbl */
322 	};
323 	struct list_head	res_grantqueue;
324 	struct list_head	res_convertqueue;
325 	struct list_head	res_waitqueue;
326 
327 	struct list_head	res_root_list;	    /* used for recovery */
328 	struct list_head	res_recover_list;   /* used for recovery */
329 	int			res_recover_locks_count;
330 
331 	char			*res_lvbptr;
332 	char			res_name[DLM_RESNAME_MAXLEN+1];
333 };
334 
335 /* dlm_master_lookup() flags */
336 
337 #define DLM_LU_RECOVER_DIR	1
338 #define DLM_LU_RECOVER_MASTER	2
339 
340 /* dlm_master_lookup() results */
341 
342 #define DLM_LU_MATCH		1
343 #define DLM_LU_ADD		2
344 
345 /* find_rsb() flags */
346 
347 #define R_REQUEST		0x00000001
348 #define R_RECEIVE_REQUEST	0x00000002
349 #define R_RECEIVE_RECOVER	0x00000004
350 
351 /* rsb_flags */
352 
353 enum rsb_flags {
354 	RSB_MASTER_UNCERTAIN,
355 	RSB_VALNOTVALID,
356 	RSB_VALNOTVALID_PREV,
357 	RSB_NEW_MASTER,
358 	RSB_NEW_MASTER2,
359 	RSB_RECOVER_CONVERT,
360 	RSB_RECOVER_GRANT,
361 	RSB_RECOVER_LVB_INVAL,
362 };
363 
rsb_set_flag(struct dlm_rsb * r,enum rsb_flags flag)364 static inline void rsb_set_flag(struct dlm_rsb *r, enum rsb_flags flag)
365 {
366 	__set_bit(flag, &r->res_flags);
367 }
368 
rsb_clear_flag(struct dlm_rsb * r,enum rsb_flags flag)369 static inline void rsb_clear_flag(struct dlm_rsb *r, enum rsb_flags flag)
370 {
371 	__clear_bit(flag, &r->res_flags);
372 }
373 
rsb_flag(struct dlm_rsb * r,enum rsb_flags flag)374 static inline int rsb_flag(struct dlm_rsb *r, enum rsb_flags flag)
375 {
376 	return test_bit(flag, &r->res_flags);
377 }
378 
379 
380 /* dlm_header is first element of all structs sent between nodes */
381 
382 #define DLM_HEADER_MAJOR	0x00030000
383 #define DLM_HEADER_MINOR	0x00000002
384 
385 #define DLM_VERSION_3_1		0x00030001
386 #define DLM_VERSION_3_2		0x00030002
387 
388 #define DLM_HEADER_SLOTS	0x00000001
389 
390 #define DLM_MSG			1
391 #define DLM_RCOM		2
392 #define DLM_OPTS		3
393 #define DLM_ACK			4
394 #define DLM_FIN			5
395 
396 struct dlm_header {
397 	__le32			h_version;
398 	union {
399 		/* for DLM_MSG and DLM_RCOM */
400 		__le32		h_lockspace;
401 		/* for DLM_ACK and DLM_OPTS */
402 		__le32		h_seq;
403 	} u;
404 	__le32			h_nodeid;	/* nodeid of sender */
405 	__le16			h_length;
406 	uint8_t			h_cmd;		/* DLM_MSG, DLM_RCOM */
407 	uint8_t			h_pad;
408 };
409 
410 #define DLM_MSG_REQUEST		1
411 #define DLM_MSG_CONVERT		2
412 #define DLM_MSG_UNLOCK		3
413 #define DLM_MSG_CANCEL		4
414 #define DLM_MSG_REQUEST_REPLY	5
415 #define DLM_MSG_CONVERT_REPLY	6
416 #define DLM_MSG_UNLOCK_REPLY	7
417 #define DLM_MSG_CANCEL_REPLY	8
418 #define DLM_MSG_GRANT		9
419 #define DLM_MSG_BAST		10
420 #define DLM_MSG_LOOKUP		11
421 #define DLM_MSG_REMOVE		12
422 #define DLM_MSG_LOOKUP_REPLY	13
423 #define DLM_MSG_PURGE		14
424 
425 struct dlm_message {
426 	struct dlm_header	m_header;
427 	__le32			m_type;		/* DLM_MSG_ */
428 	__le32			m_nodeid;
429 	__le32			m_pid;
430 	__le32			m_lkid;		/* lkid on sender */
431 	__le32			m_remid;	/* lkid on receiver */
432 	__le32			m_parent_lkid;
433 	__le32			m_parent_remid;
434 	__le32			m_exflags;
435 	__le32			m_sbflags;
436 	__le32			m_flags;
437 	__le32			m_lvbseq;
438 	__le32			m_hash;
439 	__le32			m_status;
440 	__le32			m_grmode;
441 	__le32			m_rqmode;
442 	__le32			m_bastmode;
443 	__le32			m_asts;
444 	__le32			m_result;	/* 0 or -EXXX */
445 	char			m_extra[];	/* name or lvb */
446 };
447 
448 
449 #define DLM_RS_NODES		0x00000001
450 #define DLM_RS_NODES_ALL	0x00000002
451 #define DLM_RS_DIR		0x00000004
452 #define DLM_RS_DIR_ALL		0x00000008
453 #define DLM_RS_LOCKS		0x00000010
454 #define DLM_RS_LOCKS_ALL	0x00000020
455 #define DLM_RS_DONE		0x00000040
456 #define DLM_RS_DONE_ALL		0x00000080
457 
458 #define DLM_RCOM_STATUS		1
459 #define DLM_RCOM_NAMES		2
460 #define DLM_RCOM_LOOKUP		3
461 #define DLM_RCOM_LOCK		4
462 #define DLM_RCOM_STATUS_REPLY	5
463 #define DLM_RCOM_NAMES_REPLY	6
464 #define DLM_RCOM_LOOKUP_REPLY	7
465 #define DLM_RCOM_LOCK_REPLY	8
466 
467 struct dlm_rcom {
468 	struct dlm_header	rc_header;
469 	__le32			rc_type;	/* DLM_RCOM_ */
470 	__le32			rc_result;	/* multi-purpose */
471 	__le64			rc_id;		/* match reply with request */
472 	__le64			rc_seq;		/* sender's ls_recover_seq */
473 	__le64			rc_seq_reply;	/* remote ls_recover_seq */
474 	char			rc_buf[];
475 };
476 
477 struct dlm_opt_header {
478 	__le16		t_type;
479 	__le16		t_length;
480 	__le32		t_pad;
481 	/* need to be 8 byte aligned */
482 	char		t_value[];
483 };
484 
485 /* encapsulation header */
486 struct dlm_opts {
487 	struct dlm_header	o_header;
488 	uint8_t			o_nextcmd;
489 	uint8_t			o_pad;
490 	__le16			o_optlen;
491 	__le32			o_pad2;
492 	char			o_opts[];
493 };
494 
495 union dlm_packet {
496 	struct dlm_header	header;		/* common to other two */
497 	struct dlm_message	message;
498 	struct dlm_rcom		rcom;
499 	struct dlm_opts		opts;
500 };
501 
502 #define DLM_RSF_NEED_SLOTS	0x00000001
503 
504 /* RCOM_STATUS data */
505 struct rcom_status {
506 	__le32			rs_flags;
507 	__le32			rs_unused1;
508 	__le64			rs_unused2;
509 };
510 
511 /* RCOM_STATUS_REPLY data */
512 struct rcom_config {
513 	__le32			rf_lvblen;
514 	__le32			rf_lsflags;
515 
516 	/* DLM_HEADER_SLOTS adds: */
517 	__le32			rf_flags;
518 	__le16			rf_our_slot;
519 	__le16			rf_num_slots;
520 	__le32			rf_generation;
521 	__le32			rf_unused1;
522 	__le64			rf_unused2;
523 };
524 
525 struct rcom_slot {
526 	__le32			ro_nodeid;
527 	__le16			ro_slot;
528 	__le16			ro_unused1;
529 	__le64			ro_unused2;
530 };
531 
532 struct rcom_lock {
533 	__le32			rl_ownpid;
534 	__le32			rl_lkid;
535 	__le32			rl_remid;
536 	__le32			rl_parent_lkid;
537 	__le32			rl_parent_remid;
538 	__le32			rl_exflags;
539 	__le32			rl_flags;
540 	__le32			rl_lvbseq;
541 	__le32			rl_result;
542 	int8_t			rl_rqmode;
543 	int8_t			rl_grmode;
544 	int8_t			rl_status;
545 	int8_t			rl_asts;
546 	__le16			rl_wait_type;
547 	__le16			rl_namelen;
548 	char			rl_name[DLM_RESNAME_MAXLEN];
549 	char			rl_lvb[];
550 };
551 
552 /*
553  * The max number of resources per rsbtbl bucket that shrink will attempt
554  * to remove in each iteration.
555  */
556 
557 #define DLM_REMOVE_NAMES_MAX 8
558 
559 struct dlm_ls {
560 	struct list_head	ls_list;	/* list of lockspaces */
561 	dlm_lockspace_t		*ls_local_handle;
562 	uint32_t		ls_global_id;	/* global unique lockspace ID */
563 	uint32_t		ls_generation;
564 	uint32_t		ls_exflags;
565 	int			ls_lvblen;
566 	atomic_t		ls_count;	/* refcount of processes in
567 						   the dlm using this ls */
568 	wait_queue_head_t	ls_count_wait;
569 	int			ls_create_count; /* create/release refcount */
570 	unsigned long		ls_flags;	/* LSFL_ */
571 	unsigned long		ls_scan_time;
572 	struct kobject		ls_kobj;
573 
574 	struct idr		ls_lkbidr;
575 	spinlock_t		ls_lkbidr_spin;
576 
577 	struct dlm_rsbtable	*ls_rsbtbl;
578 	uint32_t		ls_rsbtbl_size;
579 
580 	struct mutex		ls_waiters_mutex;
581 	struct list_head	ls_waiters;	/* lkbs needing a reply */
582 
583 	struct mutex		ls_orphans_mutex;
584 	struct list_head	ls_orphans;
585 
586 #ifdef CONFIG_DLM_DEPRECATED_API
587 	struct mutex		ls_timeout_mutex;
588 	struct list_head	ls_timeout;
589 #endif
590 
591 	spinlock_t		ls_new_rsb_spin;
592 	int			ls_new_rsb_count;
593 	struct list_head	ls_new_rsb;	/* new rsb structs */
594 
595 	char			*ls_remove_names[DLM_REMOVE_NAMES_MAX];
596 	int			ls_remove_lens[DLM_REMOVE_NAMES_MAX];
597 
598 	struct list_head	ls_nodes;	/* current nodes in ls */
599 	struct list_head	ls_nodes_gone;	/* dead node list, recovery */
600 	int			ls_num_nodes;	/* number of nodes in ls */
601 	int			ls_low_nodeid;
602 	int			ls_total_weight;
603 	int			*ls_node_array;
604 
605 	int			ls_slot;
606 	int			ls_num_slots;
607 	int			ls_slots_size;
608 	struct dlm_slot		*ls_slots;
609 
610 	struct dlm_rsb		ls_stub_rsb;	/* for returning errors */
611 	struct dlm_lkb		ls_stub_lkb;	/* for returning errors */
612 	struct dlm_message	ls_stub_ms;	/* for faking a reply */
613 
614 	struct dentry		*ls_debug_rsb_dentry; /* debugfs */
615 	struct dentry		*ls_debug_waiters_dentry; /* debugfs */
616 	struct dentry		*ls_debug_locks_dentry; /* debugfs */
617 	struct dentry		*ls_debug_all_dentry; /* debugfs */
618 	struct dentry		*ls_debug_toss_dentry; /* debugfs */
619 
620 	wait_queue_head_t	ls_uevent_wait;	/* user part of join/leave */
621 	int			ls_uevent_result;
622 	struct completion	ls_recovery_done;
623 	int			ls_recovery_result;
624 
625 	struct miscdevice       ls_device;
626 
627 	struct workqueue_struct	*ls_callback_wq;
628 
629 	/* recovery related */
630 
631 	spinlock_t		ls_cb_lock;
632 	struct list_head	ls_cb_delay; /* save for queue_work later */
633 	struct timer_list	ls_timer;
634 	struct task_struct	*ls_recoverd_task;
635 	struct mutex		ls_recoverd_active;
636 	spinlock_t		ls_recover_lock;
637 	unsigned long		ls_recover_begin; /* jiffies timestamp */
638 	uint32_t		ls_recover_status; /* DLM_RS_ */
639 	uint64_t		ls_recover_seq;
640 	struct dlm_recover	*ls_recover_args;
641 	struct rw_semaphore	ls_in_recovery;	/* block local requests */
642 	struct rw_semaphore	ls_recv_active;	/* block dlm_recv */
643 	struct list_head	ls_requestqueue;/* queue remote requests */
644 	atomic_t		ls_requestqueue_cnt;
645 	wait_queue_head_t	ls_requestqueue_wait;
646 	struct mutex		ls_requestqueue_mutex;
647 	struct dlm_rcom		*ls_recover_buf;
648 	int			ls_recover_nodeid; /* for debugging */
649 	unsigned int		ls_recover_dir_sent_res; /* for log info */
650 	unsigned int		ls_recover_dir_sent_msg; /* for log info */
651 	unsigned int		ls_recover_locks_in; /* for log info */
652 	uint64_t		ls_rcom_seq;
653 	spinlock_t		ls_rcom_spin;
654 	struct list_head	ls_recover_list;
655 	spinlock_t		ls_recover_list_lock;
656 	int			ls_recover_list_count;
657 	struct idr		ls_recover_idr;
658 	spinlock_t		ls_recover_idr_lock;
659 	wait_queue_head_t	ls_wait_general;
660 	wait_queue_head_t	ls_recover_lock_wait;
661 	spinlock_t		ls_clear_proc_locks;
662 
663 	struct list_head	ls_root_list;	/* root resources */
664 	struct rw_semaphore	ls_root_sem;	/* protect root_list */
665 
666 	const struct dlm_lockspace_ops *ls_ops;
667 	void			*ls_ops_arg;
668 
669 	int			ls_namelen;
670 	char			ls_name[DLM_LOCKSPACE_LEN + 1];
671 };
672 
673 /*
674  * LSFL_RECOVER_STOP - dlm_ls_stop() sets this to tell dlm recovery routines
675  * that they should abort what they're doing so new recovery can be started.
676  *
677  * LSFL_RECOVER_DOWN - dlm_ls_stop() sets this to tell dlm_recoverd that it
678  * should do down_write() on the in_recovery rw_semaphore. (doing down_write
679  * within dlm_ls_stop causes complaints about the lock acquired/released
680  * in different contexts.)
681  *
682  * LSFL_RECOVER_LOCK - dlm_recoverd holds the in_recovery rw_semaphore.
683  * It sets this after it is done with down_write() on the in_recovery
684  * rw_semaphore and clears it after it has released the rw_semaphore.
685  *
686  * LSFL_RECOVER_WORK - dlm_ls_start() sets this to tell dlm_recoverd that it
687  * should begin recovery of the lockspace.
688  *
689  * LSFL_RUNNING - set when normal locking activity is enabled.
690  * dlm_ls_stop() clears this to tell dlm locking routines that they should
691  * quit what they are doing so recovery can run.  dlm_recoverd sets
692  * this after recovery is finished.
693  */
694 
695 #define LSFL_RECOVER_STOP	0
696 #define LSFL_RECOVER_DOWN	1
697 #define LSFL_RECOVER_LOCK	2
698 #define LSFL_RECOVER_WORK	3
699 #define LSFL_RUNNING		4
700 
701 #define LSFL_RCOM_READY		5
702 #define LSFL_RCOM_WAIT		6
703 #define LSFL_UEVENT_WAIT	7
704 #ifdef CONFIG_DLM_DEPRECATED_API
705 #define LSFL_TIMEWARN		8
706 #endif
707 #define LSFL_CB_DELAY		9
708 #define LSFL_NODIR		10
709 
710 /* much of this is just saving user space pointers associated with the
711    lock that we pass back to the user lib with an ast */
712 
713 struct dlm_user_args {
714 	struct dlm_user_proc	*proc; /* each process that opens the lockspace
715 					  device has private data
716 					  (dlm_user_proc) on the struct file,
717 					  the process's locks point back to it*/
718 	struct dlm_lksb		lksb;
719 	struct dlm_lksb __user	*user_lksb;
720 	void __user		*castparam;
721 	void __user		*castaddr;
722 	void __user		*bastparam;
723 	void __user		*bastaddr;
724 	uint64_t		xid;
725 };
726 
727 #define DLM_PROC_FLAGS_CLOSING 1
728 #define DLM_PROC_FLAGS_COMPAT  2
729 
730 /* locks list is kept so we can remove all a process's locks when it
731    exits (or orphan those that are persistent) */
732 
733 struct dlm_user_proc {
734 	dlm_lockspace_t		*lockspace;
735 	unsigned long		flags; /* DLM_PROC_FLAGS */
736 	struct list_head	asts;
737 	spinlock_t		asts_spin;
738 	struct list_head	locks;
739 	spinlock_t		locks_spin;
740 	struct list_head	unlocking;
741 	wait_queue_head_t	wait;
742 };
743 
dlm_locking_stopped(struct dlm_ls * ls)744 static inline int dlm_locking_stopped(struct dlm_ls *ls)
745 {
746 	return !test_bit(LSFL_RUNNING, &ls->ls_flags);
747 }
748 
dlm_recovery_stopped(struct dlm_ls * ls)749 static inline int dlm_recovery_stopped(struct dlm_ls *ls)
750 {
751 	return test_bit(LSFL_RECOVER_STOP, &ls->ls_flags);
752 }
753 
dlm_no_directory(struct dlm_ls * ls)754 static inline int dlm_no_directory(struct dlm_ls *ls)
755 {
756 	return test_bit(LSFL_NODIR, &ls->ls_flags);
757 }
758 
759 #ifdef CONFIG_DLM_DEPRECATED_API
760 int dlm_netlink_init(void);
761 void dlm_netlink_exit(void);
762 void dlm_timeout_warn(struct dlm_lkb *lkb);
763 #else
dlm_netlink_init(void)764 static inline int dlm_netlink_init(void) { return 0; }
dlm_netlink_exit(void)765 static inline void dlm_netlink_exit(void) { };
dlm_timeout_warn(struct dlm_lkb * lkb)766 static inline void dlm_timeout_warn(struct dlm_lkb *lkb) { };
767 #endif
768 int dlm_plock_init(void);
769 void dlm_plock_exit(void);
770 
771 #ifdef CONFIG_DLM_DEBUG
772 void dlm_register_debugfs(void);
773 void dlm_unregister_debugfs(void);
774 void dlm_create_debug_file(struct dlm_ls *ls);
775 void dlm_delete_debug_file(struct dlm_ls *ls);
776 void *dlm_create_debug_comms_file(int nodeid, void *data);
777 void dlm_delete_debug_comms_file(void *ctx);
778 #else
dlm_register_debugfs(void)779 static inline void dlm_register_debugfs(void) { }
dlm_unregister_debugfs(void)780 static inline void dlm_unregister_debugfs(void) { }
dlm_create_debug_file(struct dlm_ls * ls)781 static inline void dlm_create_debug_file(struct dlm_ls *ls) { }
dlm_delete_debug_file(struct dlm_ls * ls)782 static inline void dlm_delete_debug_file(struct dlm_ls *ls) { }
dlm_create_debug_comms_file(int nodeid,void * data)783 static inline void *dlm_create_debug_comms_file(int nodeid, void *data) { return NULL; }
dlm_delete_debug_comms_file(void * ctx)784 static inline void dlm_delete_debug_comms_file(void *ctx) { }
785 #endif
786 
787 #endif				/* __DLM_INTERNAL_DOT_H__ */
788 
789