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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
53struct dlm_ls;
54struct dlm_lkb;
55struct dlm_rsb;
56struct dlm_member;
57struct dlm_rsbtable;
58struct dlm_dirtable;
59struct dlm_direntry;
60struct dlm_recover;
61struct dlm_header;
62struct dlm_message;
63struct dlm_rcom;
64struct dlm_mhandle;
65
66#define log_print(fmt, args...) \
67 printk(KERN_ERR "dlm: "fmt"\n" , ##args)
68#define log_error(ls, fmt, args...) \
69 printk(KERN_ERR "dlm: %s: " fmt "\n", (ls)->ls_name , ##args)
70
71#define log_debug(ls, fmt, args...) \
72do { \
73 if (dlm_config.ci_log_debug) \
74 printk(KERN_DEBUG "dlm: %s: " fmt "\n", \
75 (ls)->ls_name , ##args); \
76} while (0)
77
78#define log_limit(ls, fmt, args...) \
79do { \
80 if (dlm_config.ci_log_debug) \
81 printk_ratelimited(KERN_DEBUG "dlm: %s: " fmt "\n", \
82 (ls)->ls_name , ##args); \
83} while (0)
84
85#define DLM_ASSERT(x, do) \
86{ \
87 if (!(x)) \
88 { \
89 printk(KERN_ERR "\nDLM: Assertion failed on line %d of file %s\n" \
90 "DLM: assertion: \"%s\"\n" \
91 "DLM: time = %lu\n", \
92 __LINE__, __FILE__, #x, jiffies); \
93 {do} \
94 printk("\n"); \
95 BUG(); \
96 panic("DLM: Record message above and reboot.\n"); \
97 } \
98}
99
100
101struct dlm_direntry {
102 struct list_head list;
103 uint32_t master_nodeid;
104 uint16_t length;
105 char name[1];
106};
107
108struct dlm_dirtable {
109 struct list_head list;
110 spinlock_t lock;
111};
112
113struct dlm_rsbtable {
114 struct rb_root keep;
115 struct rb_root toss;
116 spinlock_t lock;
117};
118
119
120/*
121 * Lockspace member (per node in a ls)
122 */
123
124struct dlm_member {
125 struct list_head list;
126 int nodeid;
127 int weight;
128 int slot;
129 int slot_prev;
130 int comm_seq;
131 uint32_t generation;
132};
133
134/*
135 * Save and manage recovery state for a lockspace.
136 */
137
138struct dlm_recover {
139 struct list_head list;
140 struct dlm_config_node *nodes;
141 int nodes_count;
142 uint64_t seq;
143};
144
145/*
146 * Pass input args to second stage locking function.
147 */
148
149struct dlm_args {
150 uint32_t flags;
151 void (*astfn) (void *astparam);
152 void *astparam;
153 void (*bastfn) (void *astparam, int mode);
154 int mode;
155 struct dlm_lksb *lksb;
156 unsigned long timeout;
157};
158
159
160/*
161 * Lock block
162 *
163 * A lock can be one of three types:
164 *
165 * local copy lock is mastered locally
166 * (lkb_nodeid is zero and DLM_LKF_MSTCPY is not set)
167 * process copy lock is mastered on a remote node
168 * (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is not set)
169 * master copy master node's copy of a lock owned by remote node
170 * (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is set)
171 *
172 * lkb_exflags: a copy of the most recent flags arg provided to dlm_lock or
173 * dlm_unlock. The dlm does not modify these or use any private flags in
174 * this field; it only contains DLM_LKF_ flags from dlm.h. These flags
175 * are sent as-is to the remote master when the lock is remote.
176 *
177 * lkb_flags: internal dlm flags (DLM_IFL_ prefix) from dlm_internal.h.
178 * Some internal flags are shared between the master and process nodes;
179 * these shared flags are kept in the lower two bytes. One of these
180 * flags set on the master copy will be propagated to the process copy
181 * and v.v. Other internal flags are private to the master or process
182 * node (e.g. DLM_IFL_MSTCPY). These are kept in the high two bytes.
183 *
184 * lkb_sbflags: status block flags. These flags are copied directly into
185 * the caller's lksb.sb_flags prior to the dlm_lock/dlm_unlock completion
186 * ast. All defined in dlm.h with DLM_SBF_ prefix.
187 *
188 * lkb_status: the lock status indicates which rsb queue the lock is
189 * on, grant, convert, or wait. DLM_LKSTS_ WAITING/GRANTED/CONVERT
190 *
191 * lkb_wait_type: the dlm message type (DLM_MSG_ prefix) for which a
192 * reply is needed. Only set when the lkb is on the lockspace waiters
193 * list awaiting a reply from a remote node.
194 *
195 * lkb_nodeid: when the lkb is a local copy, nodeid is 0; when the lkb
196 * is a master copy, nodeid specifies the remote lock holder, when the
197 * lkb is a process copy, the nodeid specifies the lock master.
198 */
199
200/* lkb_status */
201
202#define DLM_LKSTS_WAITING 1
203#define DLM_LKSTS_GRANTED 2
204#define DLM_LKSTS_CONVERT 3
205
206/* lkb_flags */
207
208#define DLM_IFL_MSTCPY 0x00010000
209#define DLM_IFL_RESEND 0x00020000
210#define DLM_IFL_DEAD 0x00040000
211#define DLM_IFL_OVERLAP_UNLOCK 0x00080000
212#define DLM_IFL_OVERLAP_CANCEL 0x00100000
213#define DLM_IFL_ENDOFLIFE 0x00200000
214#define DLM_IFL_WATCH_TIMEWARN 0x00400000
215#define DLM_IFL_TIMEOUT_CANCEL 0x00800000
216#define DLM_IFL_DEADLOCK_CANCEL 0x01000000
217#define DLM_IFL_STUB_MS 0x02000000 /* magic number for m_flags */
218#define DLM_IFL_USER 0x00000001
219#define DLM_IFL_ORPHAN 0x00000002
220
221#define DLM_CALLBACKS_SIZE 6
222
223#define DLM_CB_CAST 0x00000001
224#define DLM_CB_BAST 0x00000002
225#define DLM_CB_SKIP 0x00000004
226
227struct dlm_callback {
228 uint64_t seq;
229 uint32_t flags; /* DLM_CBF_ */
230 int sb_status; /* copy to lksb status */
231 uint8_t sb_flags; /* copy to lksb flags */
232 int8_t mode; /* rq mode of bast, gr mode of cast */
233};
234
235struct dlm_lkb {
236 struct dlm_rsb *lkb_resource; /* the rsb */
237 struct kref lkb_ref;
238 int lkb_nodeid; /* copied from rsb */
239 int lkb_ownpid; /* pid of lock owner */
240 uint32_t lkb_id; /* our lock ID */
241 uint32_t lkb_remid; /* lock ID on remote partner */
242 uint32_t lkb_exflags; /* external flags from caller */
243 uint32_t lkb_sbflags; /* lksb flags */
244 uint32_t lkb_flags; /* internal flags */
245 uint32_t lkb_lvbseq; /* lvb sequence number */
246
247 int8_t lkb_status; /* granted, waiting, convert */
248 int8_t lkb_rqmode; /* requested lock mode */
249 int8_t lkb_grmode; /* granted lock mode */
250 int8_t lkb_highbast; /* highest mode bast sent for */
251
252 int8_t lkb_wait_type; /* type of reply waiting for */
253 int8_t lkb_wait_count;
254 int lkb_wait_nodeid; /* for debugging */
255
256 struct list_head lkb_statequeue; /* rsb g/c/w list */
257 struct list_head lkb_rsb_lookup; /* waiting for rsb lookup */
258 struct list_head lkb_wait_reply; /* waiting for remote reply */
259 struct list_head lkb_ownqueue; /* list of locks for a process */
260 struct list_head lkb_time_list;
261 ktime_t lkb_timestamp;
262 ktime_t lkb_wait_time;
263 unsigned long lkb_timeout_cs;
264
265 struct mutex lkb_cb_mutex;
266 struct work_struct lkb_cb_work;
267 struct list_head lkb_cb_list; /* for ls_cb_delay or proc->asts */
268 struct dlm_callback lkb_callbacks[DLM_CALLBACKS_SIZE];
269 struct dlm_callback lkb_last_cast;
270 struct dlm_callback lkb_last_bast;
271 ktime_t lkb_last_cast_time; /* for debugging */
272 ktime_t lkb_last_bast_time; /* for debugging */
273
274 uint64_t lkb_recover_seq; /* from ls_recover_seq */
275
276 char *lkb_lvbptr;
277 struct dlm_lksb *lkb_lksb; /* caller's status block */
278 void (*lkb_astfn) (void *astparam);
279 void (*lkb_bastfn) (void *astparam, int mode);
280 union {
281 void *lkb_astparam; /* caller's ast arg */
282 struct dlm_user_args *lkb_ua;
283 };
284};
285
286
287struct dlm_rsb {
288 struct dlm_ls *res_ls; /* the lockspace */
289 struct kref res_ref;
290 struct mutex res_mutex;
291 unsigned long res_flags;
292 int res_length; /* length of rsb name */
293 int res_nodeid;
294 uint32_t res_lvbseq;
295 uint32_t res_hash;
296 uint32_t res_bucket; /* rsbtbl */
297 unsigned long res_toss_time;
298 uint32_t res_first_lkid;
299 struct list_head res_lookup; /* lkbs waiting on first */
300 union {
301 struct list_head res_hashchain;
302 struct rb_node res_hashnode; /* rsbtbl */
303 };
304 struct list_head res_grantqueue;
305 struct list_head res_convertqueue;
306 struct list_head res_waitqueue;
307
308 struct list_head res_root_list; /* used for recovery */
309 struct list_head res_recover_list; /* used for recovery */
310 int res_recover_locks_count;
311
312 char *res_lvbptr;
313 char res_name[DLM_RESNAME_MAXLEN+1];
314};
315
316/* find_rsb() flags */
317
318#define R_MASTER 1 /* only return rsb if it's a master */
319#define R_CREATE 2 /* create/add rsb if not found */
320
321/* rsb_flags */
322
323enum rsb_flags {
324 RSB_MASTER_UNCERTAIN,
325 RSB_VALNOTVALID,
326 RSB_VALNOTVALID_PREV,
327 RSB_NEW_MASTER,
328 RSB_NEW_MASTER2,
329 RSB_RECOVER_CONVERT,
330 RSB_RECOVER_GRANT,
331};
332
333static inline void rsb_set_flag(struct dlm_rsb *r, enum rsb_flags flag)
334{
335 __set_bit(flag, &r->res_flags);
336}
337
338static inline void rsb_clear_flag(struct dlm_rsb *r, enum rsb_flags flag)
339{
340 __clear_bit(flag, &r->res_flags);
341}
342
343static inline int rsb_flag(struct dlm_rsb *r, enum rsb_flags flag)
344{
345 return test_bit(flag, &r->res_flags);
346}
347
348
349/* dlm_header is first element of all structs sent between nodes */
350
351#define DLM_HEADER_MAJOR 0x00030000
352#define DLM_HEADER_MINOR 0x00000001
353
354#define DLM_HEADER_SLOTS 0x00000001
355
356#define DLM_MSG 1
357#define DLM_RCOM 2
358
359struct dlm_header {
360 uint32_t h_version;
361 uint32_t h_lockspace;
362 uint32_t h_nodeid; /* nodeid of sender */
363 uint16_t h_length;
364 uint8_t h_cmd; /* DLM_MSG, DLM_RCOM */
365 uint8_t h_pad;
366};
367
368
369#define DLM_MSG_REQUEST 1
370#define DLM_MSG_CONVERT 2
371#define DLM_MSG_UNLOCK 3
372#define DLM_MSG_CANCEL 4
373#define DLM_MSG_REQUEST_REPLY 5
374#define DLM_MSG_CONVERT_REPLY 6
375#define DLM_MSG_UNLOCK_REPLY 7
376#define DLM_MSG_CANCEL_REPLY 8
377#define DLM_MSG_GRANT 9
378#define DLM_MSG_BAST 10
379#define DLM_MSG_LOOKUP 11
380#define DLM_MSG_REMOVE 12
381#define DLM_MSG_LOOKUP_REPLY 13
382#define DLM_MSG_PURGE 14
383
384struct dlm_message {
385 struct dlm_header m_header;
386 uint32_t m_type; /* DLM_MSG_ */
387 uint32_t m_nodeid;
388 uint32_t m_pid;
389 uint32_t m_lkid; /* lkid on sender */
390 uint32_t m_remid; /* lkid on receiver */
391 uint32_t m_parent_lkid;
392 uint32_t m_parent_remid;
393 uint32_t m_exflags;
394 uint32_t m_sbflags;
395 uint32_t m_flags;
396 uint32_t m_lvbseq;
397 uint32_t m_hash;
398 int m_status;
399 int m_grmode;
400 int m_rqmode;
401 int m_bastmode;
402 int m_asts;
403 int m_result; /* 0 or -EXXX */
404 char m_extra[0]; /* name or lvb */
405};
406
407
408#define DLM_RS_NODES 0x00000001
409#define DLM_RS_NODES_ALL 0x00000002
410#define DLM_RS_DIR 0x00000004
411#define DLM_RS_DIR_ALL 0x00000008
412#define DLM_RS_LOCKS 0x00000010
413#define DLM_RS_LOCKS_ALL 0x00000020
414#define DLM_RS_DONE 0x00000040
415#define DLM_RS_DONE_ALL 0x00000080
416
417#define DLM_RCOM_STATUS 1
418#define DLM_RCOM_NAMES 2
419#define DLM_RCOM_LOOKUP 3
420#define DLM_RCOM_LOCK 4
421#define DLM_RCOM_STATUS_REPLY 5
422#define DLM_RCOM_NAMES_REPLY 6
423#define DLM_RCOM_LOOKUP_REPLY 7
424#define DLM_RCOM_LOCK_REPLY 8
425
426struct dlm_rcom {
427 struct dlm_header rc_header;
428 uint32_t rc_type; /* DLM_RCOM_ */
429 int rc_result; /* multi-purpose */
430 uint64_t rc_id; /* match reply with request */
431 uint64_t rc_seq; /* sender's ls_recover_seq */
432 uint64_t rc_seq_reply; /* remote ls_recover_seq */
433 char rc_buf[0];
434};
435
436union dlm_packet {
437 struct dlm_header header; /* common to other two */
438 struct dlm_message message;
439 struct dlm_rcom rcom;
440};
441
442#define DLM_RSF_NEED_SLOTS 0x00000001
443
444/* RCOM_STATUS data */
445struct rcom_status {
446 __le32 rs_flags;
447 __le32 rs_unused1;
448 __le64 rs_unused2;
449};
450
451/* RCOM_STATUS_REPLY data */
452struct rcom_config {
453 __le32 rf_lvblen;
454 __le32 rf_lsflags;
455
456 /* DLM_HEADER_SLOTS adds: */
457 __le32 rf_flags;
458 __le16 rf_our_slot;
459 __le16 rf_num_slots;
460 __le32 rf_generation;
461 __le32 rf_unused1;
462 __le64 rf_unused2;
463};
464
465struct rcom_slot {
466 __le32 ro_nodeid;
467 __le16 ro_slot;
468 __le16 ro_unused1;
469 __le64 ro_unused2;
470};
471
472struct rcom_lock {
473 __le32 rl_ownpid;
474 __le32 rl_lkid;
475 __le32 rl_remid;
476 __le32 rl_parent_lkid;
477 __le32 rl_parent_remid;
478 __le32 rl_exflags;
479 __le32 rl_flags;
480 __le32 rl_lvbseq;
481 __le32 rl_result;
482 int8_t rl_rqmode;
483 int8_t rl_grmode;
484 int8_t rl_status;
485 int8_t rl_asts;
486 __le16 rl_wait_type;
487 __le16 rl_namelen;
488 char rl_name[DLM_RESNAME_MAXLEN];
489 char rl_lvb[0];
490};
491
492struct dlm_ls {
493 struct list_head ls_list; /* list of lockspaces */
494 dlm_lockspace_t *ls_local_handle;
495 uint32_t ls_global_id; /* global unique lockspace ID */
496 uint32_t ls_generation;
497 uint32_t ls_exflags;
498 int ls_lvblen;
499 int ls_count; /* refcount of processes in
500 the dlm using this ls */
501 int ls_create_count; /* create/release refcount */
502 unsigned long ls_flags; /* LSFL_ */
503 unsigned long ls_scan_time;
504 struct kobject ls_kobj;
505
506 struct idr ls_lkbidr;
507 spinlock_t ls_lkbidr_spin;
508
509 struct dlm_rsbtable *ls_rsbtbl;
510 uint32_t ls_rsbtbl_size;
511
512 struct dlm_dirtable *ls_dirtbl;
513 uint32_t ls_dirtbl_size;
514
515 struct mutex ls_waiters_mutex;
516 struct list_head ls_waiters; /* lkbs needing a reply */
517
518 struct mutex ls_orphans_mutex;
519 struct list_head ls_orphans;
520
521 struct mutex ls_timeout_mutex;
522 struct list_head ls_timeout;
523
524 spinlock_t ls_new_rsb_spin;
525 int ls_new_rsb_count;
526 struct list_head ls_new_rsb; /* new rsb structs */
527
528 struct list_head ls_nodes; /* current nodes in ls */
529 struct list_head ls_nodes_gone; /* dead node list, recovery */
530 int ls_num_nodes; /* number of nodes in ls */
531 int ls_low_nodeid;
532 int ls_total_weight;
533 int *ls_node_array;
534
535 int ls_slot;
536 int ls_num_slots;
537 int ls_slots_size;
538 struct dlm_slot *ls_slots;
539
540 struct dlm_rsb ls_stub_rsb; /* for returning errors */
541 struct dlm_lkb ls_stub_lkb; /* for returning errors */
542 struct dlm_message ls_stub_ms; /* for faking a reply */
543
544 struct dentry *ls_debug_rsb_dentry; /* debugfs */
545 struct dentry *ls_debug_waiters_dentry; /* debugfs */
546 struct dentry *ls_debug_locks_dentry; /* debugfs */
547 struct dentry *ls_debug_all_dentry; /* debugfs */
548
549 wait_queue_head_t ls_uevent_wait; /* user part of join/leave */
550 int ls_uevent_result;
551 struct completion ls_members_done;
552 int ls_members_result;
553
554 struct miscdevice ls_device;
555
556 struct workqueue_struct *ls_callback_wq;
557
558 /* recovery related */
559
560 struct mutex ls_cb_mutex;
561 struct list_head ls_cb_delay; /* save for queue_work later */
562 struct timer_list ls_timer;
563 struct task_struct *ls_recoverd_task;
564 struct mutex ls_recoverd_active;
565 spinlock_t ls_recover_lock;
566 unsigned long ls_recover_begin; /* jiffies timestamp */
567 uint32_t ls_recover_status; /* DLM_RS_ */
568 uint64_t ls_recover_seq;
569 struct dlm_recover *ls_recover_args;
570 struct rw_semaphore ls_in_recovery; /* block local requests */
571 struct rw_semaphore ls_recv_active; /* block dlm_recv */
572 struct list_head ls_requestqueue;/* queue remote requests */
573 struct mutex ls_requestqueue_mutex;
574 struct dlm_rcom *ls_recover_buf;
575 int ls_recover_nodeid; /* for debugging */
576 unsigned int ls_recover_locks_in; /* for log info */
577 uint64_t ls_rcom_seq;
578 spinlock_t ls_rcom_spin;
579 struct list_head ls_recover_list;
580 spinlock_t ls_recover_list_lock;
581 int ls_recover_list_count;
582 wait_queue_head_t ls_wait_general;
583 struct mutex ls_clear_proc_locks;
584
585 struct list_head ls_root_list; /* root resources */
586 struct rw_semaphore ls_root_sem; /* protect root_list */
587
588 const struct dlm_lockspace_ops *ls_ops;
589 void *ls_ops_arg;
590
591 int ls_namelen;
592 char ls_name[1];
593};
594
595#define LSFL_WORK 0
596#define LSFL_RUNNING 1
597#define LSFL_RECOVERY_STOP 2
598#define LSFL_RCOM_READY 3
599#define LSFL_RCOM_WAIT 4
600#define LSFL_UEVENT_WAIT 5
601#define LSFL_TIMEWARN 6
602#define LSFL_CB_DELAY 7
603#define LSFL_NODIR 8
604
605/* much of this is just saving user space pointers associated with the
606 lock that we pass back to the user lib with an ast */
607
608struct dlm_user_args {
609 struct dlm_user_proc *proc; /* each process that opens the lockspace
610 device has private data
611 (dlm_user_proc) on the struct file,
612 the process's locks point back to it*/
613 struct dlm_lksb lksb;
614 struct dlm_lksb __user *user_lksb;
615 void __user *castparam;
616 void __user *castaddr;
617 void __user *bastparam;
618 void __user *bastaddr;
619 uint64_t xid;
620};
621
622#define DLM_PROC_FLAGS_CLOSING 1
623#define DLM_PROC_FLAGS_COMPAT 2
624
625/* locks list is kept so we can remove all a process's locks when it
626 exits (or orphan those that are persistent) */
627
628struct dlm_user_proc {
629 dlm_lockspace_t *lockspace;
630 unsigned long flags; /* DLM_PROC_FLAGS */
631 struct list_head asts;
632 spinlock_t asts_spin;
633 struct list_head locks;
634 spinlock_t locks_spin;
635 struct list_head unlocking;
636 wait_queue_head_t wait;
637};
638
639static inline int dlm_locking_stopped(struct dlm_ls *ls)
640{
641 return !test_bit(LSFL_RUNNING, &ls->ls_flags);
642}
643
644static inline int dlm_recovery_stopped(struct dlm_ls *ls)
645{
646 return test_bit(LSFL_RECOVERY_STOP, &ls->ls_flags);
647}
648
649static inline int dlm_no_directory(struct dlm_ls *ls)
650{
651 return test_bit(LSFL_NODIR, &ls->ls_flags);
652}
653
654int dlm_netlink_init(void);
655void dlm_netlink_exit(void);
656void dlm_timeout_warn(struct dlm_lkb *lkb);
657int dlm_plock_init(void);
658void dlm_plock_exit(void);
659
660#ifdef CONFIG_DLM_DEBUG
661int dlm_register_debugfs(void);
662void dlm_unregister_debugfs(void);
663int dlm_create_debug_file(struct dlm_ls *ls);
664void dlm_delete_debug_file(struct dlm_ls *ls);
665#else
666static inline int dlm_register_debugfs(void) { return 0; }
667static inline void dlm_unregister_debugfs(void) { }
668static inline int dlm_create_debug_file(struct dlm_ls *ls) { return 0; }
669static inline void dlm_delete_debug_file(struct dlm_ls *ls) { }
670#endif
671
672#endif /* __DLM_INTERNAL_DOT_H__ */
673
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
53struct dlm_ls;
54struct dlm_lkb;
55struct dlm_rsb;
56struct dlm_member;
57struct dlm_rsbtable;
58struct dlm_recover;
59struct dlm_header;
60struct dlm_message;
61struct dlm_rcom;
62struct dlm_mhandle;
63
64#define log_print(fmt, args...) \
65 printk(KERN_ERR "dlm: "fmt"\n" , ##args)
66#define log_error(ls, fmt, args...) \
67 printk(KERN_ERR "dlm: %s: " fmt "\n", (ls)->ls_name , ##args)
68#define log_rinfo(ls, fmt, args...) \
69 printk(KERN_INFO "dlm: %s: " fmt "\n", (ls)->ls_name , ##args);
70
71#define log_debug(ls, fmt, args...) \
72do { \
73 if (dlm_config.ci_log_debug) \
74 printk(KERN_DEBUG "dlm: %s: " fmt "\n", \
75 (ls)->ls_name , ##args); \
76} while (0)
77
78#define log_limit(ls, fmt, args...) \
79do { \
80 if (dlm_config.ci_log_debug) \
81 printk_ratelimited(KERN_DEBUG "dlm: %s: " fmt "\n", \
82 (ls)->ls_name , ##args); \
83} while (0)
84
85#define DLM_ASSERT(x, do) \
86{ \
87 if (!(x)) \
88 { \
89 printk(KERN_ERR "\nDLM: Assertion failed on line %d of file %s\n" \
90 "DLM: assertion: \"%s\"\n" \
91 "DLM: time = %lu\n", \
92 __LINE__, __FILE__, #x, jiffies); \
93 {do} \
94 printk("\n"); \
95 BUG(); \
96 panic("DLM: Record message above and reboot.\n"); \
97 } \
98}
99
100
101#define DLM_RTF_SHRINK 0x00000001
102
103struct dlm_rsbtable {
104 struct rb_root keep;
105 struct rb_root toss;
106 spinlock_t lock;
107 uint32_t flags;
108};
109
110
111/*
112 * Lockspace member (per node in a ls)
113 */
114
115struct dlm_member {
116 struct list_head list;
117 int nodeid;
118 int weight;
119 int slot;
120 int slot_prev;
121 int comm_seq;
122 uint32_t generation;
123};
124
125/*
126 * Save and manage recovery state for a lockspace.
127 */
128
129struct dlm_recover {
130 struct list_head list;
131 struct dlm_config_node *nodes;
132 int nodes_count;
133 uint64_t seq;
134};
135
136/*
137 * Pass input args to second stage locking function.
138 */
139
140struct dlm_args {
141 uint32_t flags;
142 void (*astfn) (void *astparam);
143 void *astparam;
144 void (*bastfn) (void *astparam, int mode);
145 int mode;
146 struct dlm_lksb *lksb;
147 unsigned long timeout;
148};
149
150
151/*
152 * Lock block
153 *
154 * A lock can be one of three types:
155 *
156 * local copy lock is mastered locally
157 * (lkb_nodeid is zero and DLM_LKF_MSTCPY is not set)
158 * process copy lock is mastered on a remote node
159 * (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is not set)
160 * master copy master node's copy of a lock owned by remote node
161 * (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is set)
162 *
163 * lkb_exflags: a copy of the most recent flags arg provided to dlm_lock or
164 * dlm_unlock. The dlm does not modify these or use any private flags in
165 * this field; it only contains DLM_LKF_ flags from dlm.h. These flags
166 * are sent as-is to the remote master when the lock is remote.
167 *
168 * lkb_flags: internal dlm flags (DLM_IFL_ prefix) from dlm_internal.h.
169 * Some internal flags are shared between the master and process nodes;
170 * these shared flags are kept in the lower two bytes. One of these
171 * flags set on the master copy will be propagated to the process copy
172 * and v.v. Other internal flags are private to the master or process
173 * node (e.g. DLM_IFL_MSTCPY). These are kept in the high two bytes.
174 *
175 * lkb_sbflags: status block flags. These flags are copied directly into
176 * the caller's lksb.sb_flags prior to the dlm_lock/dlm_unlock completion
177 * ast. All defined in dlm.h with DLM_SBF_ prefix.
178 *
179 * lkb_status: the lock status indicates which rsb queue the lock is
180 * on, grant, convert, or wait. DLM_LKSTS_ WAITING/GRANTED/CONVERT
181 *
182 * lkb_wait_type: the dlm message type (DLM_MSG_ prefix) for which a
183 * reply is needed. Only set when the lkb is on the lockspace waiters
184 * list awaiting a reply from a remote node.
185 *
186 * lkb_nodeid: when the lkb is a local copy, nodeid is 0; when the lkb
187 * is a master copy, nodeid specifies the remote lock holder, when the
188 * lkb is a process copy, the nodeid specifies the lock master.
189 */
190
191/* lkb_status */
192
193#define DLM_LKSTS_WAITING 1
194#define DLM_LKSTS_GRANTED 2
195#define DLM_LKSTS_CONVERT 3
196
197/* lkb_flags */
198
199#define DLM_IFL_MSTCPY 0x00010000
200#define DLM_IFL_RESEND 0x00020000
201#define DLM_IFL_DEAD 0x00040000
202#define DLM_IFL_OVERLAP_UNLOCK 0x00080000
203#define DLM_IFL_OVERLAP_CANCEL 0x00100000
204#define DLM_IFL_ENDOFLIFE 0x00200000
205#define DLM_IFL_WATCH_TIMEWARN 0x00400000
206#define DLM_IFL_TIMEOUT_CANCEL 0x00800000
207#define DLM_IFL_DEADLOCK_CANCEL 0x01000000
208#define DLM_IFL_STUB_MS 0x02000000 /* magic number for m_flags */
209#define DLM_IFL_USER 0x00000001
210#define DLM_IFL_ORPHAN 0x00000002
211
212#define DLM_CALLBACKS_SIZE 6
213
214#define DLM_CB_CAST 0x00000001
215#define DLM_CB_BAST 0x00000002
216#define DLM_CB_SKIP 0x00000004
217
218struct dlm_callback {
219 uint64_t seq;
220 uint32_t flags; /* DLM_CBF_ */
221 int sb_status; /* copy to lksb status */
222 uint8_t sb_flags; /* copy to lksb flags */
223 int8_t mode; /* rq mode of bast, gr mode of cast */
224};
225
226struct dlm_lkb {
227 struct dlm_rsb *lkb_resource; /* the rsb */
228 struct kref lkb_ref;
229 int lkb_nodeid; /* copied from rsb */
230 int lkb_ownpid; /* pid of lock owner */
231 uint32_t lkb_id; /* our lock ID */
232 uint32_t lkb_remid; /* lock ID on remote partner */
233 uint32_t lkb_exflags; /* external flags from caller */
234 uint32_t lkb_sbflags; /* lksb flags */
235 uint32_t lkb_flags; /* internal flags */
236 uint32_t lkb_lvbseq; /* lvb sequence number */
237
238 int8_t lkb_status; /* granted, waiting, convert */
239 int8_t lkb_rqmode; /* requested lock mode */
240 int8_t lkb_grmode; /* granted lock mode */
241 int8_t lkb_highbast; /* highest mode bast sent for */
242
243 int8_t lkb_wait_type; /* type of reply waiting for */
244 int8_t lkb_wait_count;
245 int lkb_wait_nodeid; /* for debugging */
246
247 struct list_head lkb_statequeue; /* rsb g/c/w list */
248 struct list_head lkb_rsb_lookup; /* waiting for rsb lookup */
249 struct list_head lkb_wait_reply; /* waiting for remote reply */
250 struct list_head lkb_ownqueue; /* list of locks for a process */
251 struct list_head lkb_time_list;
252 ktime_t lkb_timestamp;
253 ktime_t lkb_wait_time;
254 unsigned long lkb_timeout_cs;
255
256 struct mutex lkb_cb_mutex;
257 struct work_struct lkb_cb_work;
258 struct list_head lkb_cb_list; /* for ls_cb_delay or proc->asts */
259 struct dlm_callback lkb_callbacks[DLM_CALLBACKS_SIZE];
260 struct dlm_callback lkb_last_cast;
261 struct dlm_callback lkb_last_bast;
262 ktime_t lkb_last_cast_time; /* for debugging */
263 ktime_t lkb_last_bast_time; /* for debugging */
264
265 uint64_t lkb_recover_seq; /* from ls_recover_seq */
266
267 char *lkb_lvbptr;
268 struct dlm_lksb *lkb_lksb; /* caller's status block */
269 void (*lkb_astfn) (void *astparam);
270 void (*lkb_bastfn) (void *astparam, int mode);
271 union {
272 void *lkb_astparam; /* caller's ast arg */
273 struct dlm_user_args *lkb_ua;
274 };
275};
276
277/*
278 * res_master_nodeid is "normal": 0 is unset/invalid, non-zero is the real
279 * nodeid, even when nodeid is our_nodeid.
280 *
281 * res_nodeid is "odd": -1 is unset/invalid, zero means our_nodeid,
282 * greater than zero when another nodeid.
283 *
284 * (TODO: remove res_nodeid and only use res_master_nodeid)
285 */
286
287struct dlm_rsb {
288 struct dlm_ls *res_ls; /* the lockspace */
289 struct kref res_ref;
290 struct mutex res_mutex;
291 unsigned long res_flags;
292 int res_length; /* length of rsb name */
293 int res_nodeid;
294 int res_master_nodeid;
295 int res_dir_nodeid;
296 int res_id; /* for ls_recover_idr */
297 uint32_t res_lvbseq;
298 uint32_t res_hash;
299 uint32_t res_bucket; /* rsbtbl */
300 unsigned long res_toss_time;
301 uint32_t res_first_lkid;
302 struct list_head res_lookup; /* lkbs waiting on first */
303 union {
304 struct list_head res_hashchain;
305 struct rb_node res_hashnode; /* rsbtbl */
306 };
307 struct list_head res_grantqueue;
308 struct list_head res_convertqueue;
309 struct list_head res_waitqueue;
310
311 struct list_head res_root_list; /* used for recovery */
312 struct list_head res_recover_list; /* used for recovery */
313 int res_recover_locks_count;
314
315 char *res_lvbptr;
316 char res_name[DLM_RESNAME_MAXLEN+1];
317};
318
319/* dlm_master_lookup() flags */
320
321#define DLM_LU_RECOVER_DIR 1
322#define DLM_LU_RECOVER_MASTER 2
323
324/* dlm_master_lookup() results */
325
326#define DLM_LU_MATCH 1
327#define DLM_LU_ADD 2
328
329/* find_rsb() flags */
330
331#define R_REQUEST 0x00000001
332#define R_RECEIVE_REQUEST 0x00000002
333#define R_RECEIVE_RECOVER 0x00000004
334
335/* rsb_flags */
336
337enum rsb_flags {
338 RSB_MASTER_UNCERTAIN,
339 RSB_VALNOTVALID,
340 RSB_VALNOTVALID_PREV,
341 RSB_NEW_MASTER,
342 RSB_NEW_MASTER2,
343 RSB_RECOVER_CONVERT,
344 RSB_RECOVER_GRANT,
345 RSB_RECOVER_LVB_INVAL,
346};
347
348static inline void rsb_set_flag(struct dlm_rsb *r, enum rsb_flags flag)
349{
350 __set_bit(flag, &r->res_flags);
351}
352
353static inline void rsb_clear_flag(struct dlm_rsb *r, enum rsb_flags flag)
354{
355 __clear_bit(flag, &r->res_flags);
356}
357
358static inline int rsb_flag(struct dlm_rsb *r, enum rsb_flags flag)
359{
360 return test_bit(flag, &r->res_flags);
361}
362
363
364/* dlm_header is first element of all structs sent between nodes */
365
366#define DLM_HEADER_MAJOR 0x00030000
367#define DLM_HEADER_MINOR 0x00000001
368
369#define DLM_HEADER_SLOTS 0x00000001
370
371#define DLM_MSG 1
372#define DLM_RCOM 2
373
374struct dlm_header {
375 uint32_t h_version;
376 uint32_t h_lockspace;
377 uint32_t h_nodeid; /* nodeid of sender */
378 uint16_t h_length;
379 uint8_t h_cmd; /* DLM_MSG, DLM_RCOM */
380 uint8_t h_pad;
381};
382
383
384#define DLM_MSG_REQUEST 1
385#define DLM_MSG_CONVERT 2
386#define DLM_MSG_UNLOCK 3
387#define DLM_MSG_CANCEL 4
388#define DLM_MSG_REQUEST_REPLY 5
389#define DLM_MSG_CONVERT_REPLY 6
390#define DLM_MSG_UNLOCK_REPLY 7
391#define DLM_MSG_CANCEL_REPLY 8
392#define DLM_MSG_GRANT 9
393#define DLM_MSG_BAST 10
394#define DLM_MSG_LOOKUP 11
395#define DLM_MSG_REMOVE 12
396#define DLM_MSG_LOOKUP_REPLY 13
397#define DLM_MSG_PURGE 14
398
399struct dlm_message {
400 struct dlm_header m_header;
401 uint32_t m_type; /* DLM_MSG_ */
402 uint32_t m_nodeid;
403 uint32_t m_pid;
404 uint32_t m_lkid; /* lkid on sender */
405 uint32_t m_remid; /* lkid on receiver */
406 uint32_t m_parent_lkid;
407 uint32_t m_parent_remid;
408 uint32_t m_exflags;
409 uint32_t m_sbflags;
410 uint32_t m_flags;
411 uint32_t m_lvbseq;
412 uint32_t m_hash;
413 int m_status;
414 int m_grmode;
415 int m_rqmode;
416 int m_bastmode;
417 int m_asts;
418 int m_result; /* 0 or -EXXX */
419 char m_extra[0]; /* name or lvb */
420};
421
422
423#define DLM_RS_NODES 0x00000001
424#define DLM_RS_NODES_ALL 0x00000002
425#define DLM_RS_DIR 0x00000004
426#define DLM_RS_DIR_ALL 0x00000008
427#define DLM_RS_LOCKS 0x00000010
428#define DLM_RS_LOCKS_ALL 0x00000020
429#define DLM_RS_DONE 0x00000040
430#define DLM_RS_DONE_ALL 0x00000080
431
432#define DLM_RCOM_STATUS 1
433#define DLM_RCOM_NAMES 2
434#define DLM_RCOM_LOOKUP 3
435#define DLM_RCOM_LOCK 4
436#define DLM_RCOM_STATUS_REPLY 5
437#define DLM_RCOM_NAMES_REPLY 6
438#define DLM_RCOM_LOOKUP_REPLY 7
439#define DLM_RCOM_LOCK_REPLY 8
440
441struct dlm_rcom {
442 struct dlm_header rc_header;
443 uint32_t rc_type; /* DLM_RCOM_ */
444 int rc_result; /* multi-purpose */
445 uint64_t rc_id; /* match reply with request */
446 uint64_t rc_seq; /* sender's ls_recover_seq */
447 uint64_t rc_seq_reply; /* remote ls_recover_seq */
448 char rc_buf[0];
449};
450
451union dlm_packet {
452 struct dlm_header header; /* common to other two */
453 struct dlm_message message;
454 struct dlm_rcom rcom;
455};
456
457#define DLM_RSF_NEED_SLOTS 0x00000001
458
459/* RCOM_STATUS data */
460struct rcom_status {
461 __le32 rs_flags;
462 __le32 rs_unused1;
463 __le64 rs_unused2;
464};
465
466/* RCOM_STATUS_REPLY data */
467struct rcom_config {
468 __le32 rf_lvblen;
469 __le32 rf_lsflags;
470
471 /* DLM_HEADER_SLOTS adds: */
472 __le32 rf_flags;
473 __le16 rf_our_slot;
474 __le16 rf_num_slots;
475 __le32 rf_generation;
476 __le32 rf_unused1;
477 __le64 rf_unused2;
478};
479
480struct rcom_slot {
481 __le32 ro_nodeid;
482 __le16 ro_slot;
483 __le16 ro_unused1;
484 __le64 ro_unused2;
485};
486
487struct rcom_lock {
488 __le32 rl_ownpid;
489 __le32 rl_lkid;
490 __le32 rl_remid;
491 __le32 rl_parent_lkid;
492 __le32 rl_parent_remid;
493 __le32 rl_exflags;
494 __le32 rl_flags;
495 __le32 rl_lvbseq;
496 __le32 rl_result;
497 int8_t rl_rqmode;
498 int8_t rl_grmode;
499 int8_t rl_status;
500 int8_t rl_asts;
501 __le16 rl_wait_type;
502 __le16 rl_namelen;
503 char rl_name[DLM_RESNAME_MAXLEN];
504 char rl_lvb[0];
505};
506
507/*
508 * The max number of resources per rsbtbl bucket that shrink will attempt
509 * to remove in each iteration.
510 */
511
512#define DLM_REMOVE_NAMES_MAX 8
513
514struct dlm_ls {
515 struct list_head ls_list; /* list of lockspaces */
516 dlm_lockspace_t *ls_local_handle;
517 uint32_t ls_global_id; /* global unique lockspace ID */
518 uint32_t ls_generation;
519 uint32_t ls_exflags;
520 int ls_lvblen;
521 int ls_count; /* refcount of processes in
522 the dlm using this ls */
523 int ls_create_count; /* create/release refcount */
524 unsigned long ls_flags; /* LSFL_ */
525 unsigned long ls_scan_time;
526 struct kobject ls_kobj;
527
528 struct idr ls_lkbidr;
529 spinlock_t ls_lkbidr_spin;
530
531 struct dlm_rsbtable *ls_rsbtbl;
532 uint32_t ls_rsbtbl_size;
533
534 struct mutex ls_waiters_mutex;
535 struct list_head ls_waiters; /* lkbs needing a reply */
536
537 struct mutex ls_orphans_mutex;
538 struct list_head ls_orphans;
539
540 struct mutex ls_timeout_mutex;
541 struct list_head ls_timeout;
542
543 spinlock_t ls_new_rsb_spin;
544 int ls_new_rsb_count;
545 struct list_head ls_new_rsb; /* new rsb structs */
546
547 spinlock_t ls_remove_spin;
548 char ls_remove_name[DLM_RESNAME_MAXLEN+1];
549 char *ls_remove_names[DLM_REMOVE_NAMES_MAX];
550 int ls_remove_len;
551 int ls_remove_lens[DLM_REMOVE_NAMES_MAX];
552
553 struct list_head ls_nodes; /* current nodes in ls */
554 struct list_head ls_nodes_gone; /* dead node list, recovery */
555 int ls_num_nodes; /* number of nodes in ls */
556 int ls_low_nodeid;
557 int ls_total_weight;
558 int *ls_node_array;
559
560 int ls_slot;
561 int ls_num_slots;
562 int ls_slots_size;
563 struct dlm_slot *ls_slots;
564
565 struct dlm_rsb ls_stub_rsb; /* for returning errors */
566 struct dlm_lkb ls_stub_lkb; /* for returning errors */
567 struct dlm_message ls_stub_ms; /* for faking a reply */
568
569 struct dentry *ls_debug_rsb_dentry; /* debugfs */
570 struct dentry *ls_debug_waiters_dentry; /* debugfs */
571 struct dentry *ls_debug_locks_dentry; /* debugfs */
572 struct dentry *ls_debug_all_dentry; /* debugfs */
573 struct dentry *ls_debug_toss_dentry; /* debugfs */
574
575 wait_queue_head_t ls_uevent_wait; /* user part of join/leave */
576 int ls_uevent_result;
577 struct completion ls_members_done;
578 int ls_members_result;
579
580 struct miscdevice ls_device;
581
582 struct workqueue_struct *ls_callback_wq;
583
584 /* recovery related */
585
586 struct mutex ls_cb_mutex;
587 struct list_head ls_cb_delay; /* save for queue_work later */
588 struct timer_list ls_timer;
589 struct task_struct *ls_recoverd_task;
590 struct mutex ls_recoverd_active;
591 spinlock_t ls_recover_lock;
592 unsigned long ls_recover_begin; /* jiffies timestamp */
593 uint32_t ls_recover_status; /* DLM_RS_ */
594 uint64_t ls_recover_seq;
595 struct dlm_recover *ls_recover_args;
596 struct rw_semaphore ls_in_recovery; /* block local requests */
597 struct rw_semaphore ls_recv_active; /* block dlm_recv */
598 struct list_head ls_requestqueue;/* queue remote requests */
599 struct mutex ls_requestqueue_mutex;
600 struct dlm_rcom *ls_recover_buf;
601 int ls_recover_nodeid; /* for debugging */
602 unsigned int ls_recover_dir_sent_res; /* for log info */
603 unsigned int ls_recover_dir_sent_msg; /* for log info */
604 unsigned int ls_recover_locks_in; /* for log info */
605 uint64_t ls_rcom_seq;
606 spinlock_t ls_rcom_spin;
607 struct list_head ls_recover_list;
608 spinlock_t ls_recover_list_lock;
609 int ls_recover_list_count;
610 struct idr ls_recover_idr;
611 spinlock_t ls_recover_idr_lock;
612 wait_queue_head_t ls_wait_general;
613 wait_queue_head_t ls_recover_lock_wait;
614 struct mutex ls_clear_proc_locks;
615
616 struct list_head ls_root_list; /* root resources */
617 struct rw_semaphore ls_root_sem; /* protect root_list */
618
619 const struct dlm_lockspace_ops *ls_ops;
620 void *ls_ops_arg;
621
622 int ls_namelen;
623 char ls_name[1];
624};
625
626/*
627 * LSFL_RECOVER_STOP - dlm_ls_stop() sets this to tell dlm recovery routines
628 * that they should abort what they're doing so new recovery can be started.
629 *
630 * LSFL_RECOVER_DOWN - dlm_ls_stop() sets this to tell dlm_recoverd that it
631 * should do down_write() on the in_recovery rw_semaphore. (doing down_write
632 * within dlm_ls_stop causes complaints about the lock acquired/released
633 * in different contexts.)
634 *
635 * LSFL_RECOVER_LOCK - dlm_recoverd holds the in_recovery rw_semaphore.
636 * It sets this after it is done with down_write() on the in_recovery
637 * rw_semaphore and clears it after it has released the rw_semaphore.
638 *
639 * LSFL_RECOVER_WORK - dlm_ls_start() sets this to tell dlm_recoverd that it
640 * should begin recovery of the lockspace.
641 *
642 * LSFL_RUNNING - set when normal locking activity is enabled.
643 * dlm_ls_stop() clears this to tell dlm locking routines that they should
644 * quit what they are doing so recovery can run. dlm_recoverd sets
645 * this after recovery is finished.
646 */
647
648#define LSFL_RECOVER_STOP 0
649#define LSFL_RECOVER_DOWN 1
650#define LSFL_RECOVER_LOCK 2
651#define LSFL_RECOVER_WORK 3
652#define LSFL_RUNNING 4
653
654#define LSFL_RCOM_READY 5
655#define LSFL_RCOM_WAIT 6
656#define LSFL_UEVENT_WAIT 7
657#define LSFL_TIMEWARN 8
658#define LSFL_CB_DELAY 9
659#define LSFL_NODIR 10
660
661/* much of this is just saving user space pointers associated with the
662 lock that we pass back to the user lib with an ast */
663
664struct dlm_user_args {
665 struct dlm_user_proc *proc; /* each process that opens the lockspace
666 device has private data
667 (dlm_user_proc) on the struct file,
668 the process's locks point back to it*/
669 struct dlm_lksb lksb;
670 struct dlm_lksb __user *user_lksb;
671 void __user *castparam;
672 void __user *castaddr;
673 void __user *bastparam;
674 void __user *bastaddr;
675 uint64_t xid;
676};
677
678#define DLM_PROC_FLAGS_CLOSING 1
679#define DLM_PROC_FLAGS_COMPAT 2
680
681/* locks list is kept so we can remove all a process's locks when it
682 exits (or orphan those that are persistent) */
683
684struct dlm_user_proc {
685 dlm_lockspace_t *lockspace;
686 unsigned long flags; /* DLM_PROC_FLAGS */
687 struct list_head asts;
688 spinlock_t asts_spin;
689 struct list_head locks;
690 spinlock_t locks_spin;
691 struct list_head unlocking;
692 wait_queue_head_t wait;
693};
694
695static inline int dlm_locking_stopped(struct dlm_ls *ls)
696{
697 return !test_bit(LSFL_RUNNING, &ls->ls_flags);
698}
699
700static inline int dlm_recovery_stopped(struct dlm_ls *ls)
701{
702 return test_bit(LSFL_RECOVER_STOP, &ls->ls_flags);
703}
704
705static inline int dlm_no_directory(struct dlm_ls *ls)
706{
707 return test_bit(LSFL_NODIR, &ls->ls_flags);
708}
709
710int dlm_netlink_init(void);
711void dlm_netlink_exit(void);
712void dlm_timeout_warn(struct dlm_lkb *lkb);
713int dlm_plock_init(void);
714void dlm_plock_exit(void);
715
716#ifdef CONFIG_DLM_DEBUG
717int dlm_register_debugfs(void);
718void dlm_unregister_debugfs(void);
719int dlm_create_debug_file(struct dlm_ls *ls);
720void dlm_delete_debug_file(struct dlm_ls *ls);
721#else
722static inline int dlm_register_debugfs(void) { return 0; }
723static inline void dlm_unregister_debugfs(void) { }
724static inline int dlm_create_debug_file(struct dlm_ls *ls) { return 0; }
725static inline void dlm_delete_debug_file(struct dlm_ls *ls) { }
726#endif
727
728#endif /* __DLM_INTERNAL_DOT_H__ */
729