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