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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_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
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/* Size of the temp buffer midcomms allocates on the stack.
45 We try to make this large enough so most messages fit.
46 FIXME: should sctp make this unnecessary? */
47
48#define DLM_INBUF_LEN 148
49
50struct dlm_ls;
51struct dlm_lkb;
52struct dlm_rsb;
53struct dlm_member;
54struct dlm_rsbtable;
55struct dlm_recover;
56struct dlm_header;
57struct dlm_message;
58struct dlm_rcom;
59struct dlm_mhandle;
60struct dlm_msg;
61
62#define log_print(fmt, args...) \
63 printk(KERN_ERR "dlm: "fmt"\n" , ##args)
64#define log_print_ratelimited(fmt, args...) \
65 printk_ratelimited(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...) \
70do { \
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...) \
80do { \
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...) \
87do { \
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 panic("DLM: Record message above and reboot.\n"); \
104 } \
105}
106
107
108#define DLM_RTF_SHRINK 0x00000001
109
110struct dlm_rsbtable {
111 struct rb_root keep;
112 struct rb_root toss;
113 spinlock_t lock;
114 uint32_t flags;
115};
116
117
118/*
119 * Lockspace member (per node in a ls)
120 */
121
122struct dlm_member {
123 struct list_head list;
124 int nodeid;
125 int weight;
126 int slot;
127 int slot_prev;
128 int comm_seq;
129 uint32_t generation;
130};
131
132/*
133 * Save and manage recovery state for a lockspace.
134 */
135
136struct dlm_recover {
137 struct list_head list;
138 struct dlm_config_node *nodes;
139 int nodes_count;
140 uint64_t seq;
141};
142
143/*
144 * Pass input args to second stage locking function.
145 */
146
147struct dlm_args {
148 uint32_t flags;
149 void (*astfn) (void *astparam);
150 void *astparam;
151 void (*bastfn) (void *astparam, int mode);
152 int mode;
153 struct dlm_lksb *lksb;
154 unsigned long timeout;
155};
156
157
158/*
159 * Lock block
160 *
161 * A lock can be one of three types:
162 *
163 * local copy lock is mastered locally
164 * (lkb_nodeid is zero and DLM_LKF_MSTCPY is not set)
165 * process copy lock is mastered on a remote node
166 * (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is not set)
167 * master copy master node's copy of a lock owned by remote node
168 * (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is set)
169 *
170 * lkb_exflags: a copy of the most recent flags arg provided to dlm_lock or
171 * dlm_unlock. The dlm does not modify these or use any private flags in
172 * this field; it only contains DLM_LKF_ flags from dlm.h. These flags
173 * are sent as-is to the remote master when the lock is remote.
174 *
175 * lkb_flags: internal dlm flags (DLM_IFL_ prefix) from dlm_internal.h.
176 * Some internal flags are shared between the master and process nodes;
177 * these shared flags are kept in the lower two bytes. One of these
178 * flags set on the master copy will be propagated to the process copy
179 * and v.v. Other internal flags are private to the master or process
180 * node (e.g. DLM_IFL_MSTCPY). These are kept in the high two bytes.
181 *
182 * lkb_sbflags: status block flags. These flags are copied directly into
183 * the caller's lksb.sb_flags prior to the dlm_lock/dlm_unlock completion
184 * ast. All defined in dlm.h with DLM_SBF_ prefix.
185 *
186 * lkb_status: the lock status indicates which rsb queue the lock is
187 * on, grant, convert, or wait. DLM_LKSTS_ WAITING/GRANTED/CONVERT
188 *
189 * lkb_wait_type: the dlm message type (DLM_MSG_ prefix) for which a
190 * reply is needed. Only set when the lkb is on the lockspace waiters
191 * list awaiting a reply from a remote node.
192 *
193 * lkb_nodeid: when the lkb is a local copy, nodeid is 0; when the lkb
194 * is a master copy, nodeid specifies the remote lock holder, when the
195 * lkb is a process copy, the nodeid specifies the lock master.
196 */
197
198/* lkb_status */
199
200#define DLM_LKSTS_WAITING 1
201#define DLM_LKSTS_GRANTED 2
202#define DLM_LKSTS_CONVERT 3
203
204/* lkb_flags */
205
206#define DLM_IFL_MSTCPY 0x00010000
207#define DLM_IFL_RESEND 0x00020000
208#define DLM_IFL_DEAD 0x00040000
209#define DLM_IFL_OVERLAP_UNLOCK 0x00080000
210#define DLM_IFL_OVERLAP_CANCEL 0x00100000
211#define DLM_IFL_ENDOFLIFE 0x00200000
212#define DLM_IFL_WATCH_TIMEWARN 0x00400000
213#define DLM_IFL_TIMEOUT_CANCEL 0x00800000
214#define DLM_IFL_DEADLOCK_CANCEL 0x01000000
215#define DLM_IFL_STUB_MS 0x02000000 /* magic number for m_flags */
216#define DLM_IFL_USER 0x00000001
217#define DLM_IFL_ORPHAN 0x00000002
218
219#define DLM_CALLBACKS_SIZE 6
220
221#define DLM_CB_CAST 0x00000001
222#define DLM_CB_BAST 0x00000002
223#define DLM_CB_SKIP 0x00000004
224
225struct dlm_callback {
226 uint64_t seq;
227 uint32_t flags; /* DLM_CBF_ */
228 int sb_status; /* copy to lksb status */
229 uint8_t sb_flags; /* copy to lksb flags */
230 int8_t mode; /* rq mode of bast, gr mode of cast */
231};
232
233struct dlm_lkb {
234 struct dlm_rsb *lkb_resource; /* the rsb */
235 struct kref lkb_ref;
236 int lkb_nodeid; /* copied from rsb */
237 int lkb_ownpid; /* pid of lock owner */
238 uint32_t lkb_id; /* our lock ID */
239 uint32_t lkb_remid; /* lock ID on remote partner */
240 uint32_t lkb_exflags; /* external flags from caller */
241 uint32_t lkb_sbflags; /* lksb flags */
242 uint32_t lkb_flags; /* internal flags */
243 uint32_t lkb_lvbseq; /* lvb sequence number */
244
245 int8_t lkb_status; /* granted, waiting, convert */
246 int8_t lkb_rqmode; /* requested lock mode */
247 int8_t lkb_grmode; /* granted lock mode */
248 int8_t lkb_highbast; /* highest mode bast sent for */
249
250 int8_t lkb_wait_type; /* type of reply waiting for */
251 int8_t lkb_wait_count;
252 int lkb_wait_nodeid; /* for debugging */
253
254 struct list_head lkb_statequeue; /* rsb g/c/w list */
255 struct list_head lkb_rsb_lookup; /* waiting for rsb lookup */
256 struct list_head lkb_wait_reply; /* waiting for remote reply */
257 struct list_head lkb_ownqueue; /* list of locks for a process */
258 struct list_head lkb_time_list;
259 ktime_t lkb_timestamp;
260 ktime_t lkb_wait_time;
261 unsigned long lkb_timeout_cs;
262
263 struct mutex lkb_cb_mutex;
264 struct work_struct lkb_cb_work;
265 struct list_head lkb_cb_list; /* for ls_cb_delay or proc->asts */
266 struct dlm_callback lkb_callbacks[DLM_CALLBACKS_SIZE];
267 struct dlm_callback lkb_last_cast;
268 struct dlm_callback lkb_last_bast;
269 ktime_t lkb_last_cast_time; /* for debugging */
270 ktime_t lkb_last_bast_time; /* for debugging */
271
272 uint64_t lkb_recover_seq; /* from ls_recover_seq */
273
274 char *lkb_lvbptr;
275 struct dlm_lksb *lkb_lksb; /* caller's status block */
276 void (*lkb_astfn) (void *astparam);
277 void (*lkb_bastfn) (void *astparam, int mode);
278 union {
279 void *lkb_astparam; /* caller's ast arg */
280 struct dlm_user_args *lkb_ua;
281 };
282};
283
284/*
285 * res_master_nodeid is "normal": 0 is unset/invalid, non-zero is the real
286 * nodeid, even when nodeid is our_nodeid.
287 *
288 * res_nodeid is "odd": -1 is unset/invalid, zero means our_nodeid,
289 * greater than zero when another nodeid.
290 *
291 * (TODO: remove res_nodeid and only use res_master_nodeid)
292 */
293
294struct dlm_rsb {
295 struct dlm_ls *res_ls; /* the lockspace */
296 struct kref res_ref;
297 struct mutex res_mutex;
298 unsigned long res_flags;
299 int res_length; /* length of rsb name */
300 int res_nodeid;
301 int res_master_nodeid;
302 int res_dir_nodeid;
303 int res_id; /* for ls_recover_idr */
304 uint32_t res_lvbseq;
305 uint32_t res_hash;
306 uint32_t res_bucket; /* rsbtbl */
307 unsigned long res_toss_time;
308 uint32_t res_first_lkid;
309 struct list_head res_lookup; /* lkbs waiting on first */
310 union {
311 struct list_head res_hashchain;
312 struct rb_node res_hashnode; /* rsbtbl */
313 };
314 struct list_head res_grantqueue;
315 struct list_head res_convertqueue;
316 struct list_head res_waitqueue;
317
318 struct list_head res_root_list; /* used for recovery */
319 struct list_head res_recover_list; /* used for recovery */
320 int res_recover_locks_count;
321
322 char *res_lvbptr;
323 char res_name[DLM_RESNAME_MAXLEN+1];
324};
325
326/* dlm_master_lookup() flags */
327
328#define DLM_LU_RECOVER_DIR 1
329#define DLM_LU_RECOVER_MASTER 2
330
331/* dlm_master_lookup() results */
332
333#define DLM_LU_MATCH 1
334#define DLM_LU_ADD 2
335
336/* find_rsb() flags */
337
338#define R_REQUEST 0x00000001
339#define R_RECEIVE_REQUEST 0x00000002
340#define R_RECEIVE_RECOVER 0x00000004
341
342/* rsb_flags */
343
344enum rsb_flags {
345 RSB_MASTER_UNCERTAIN,
346 RSB_VALNOTVALID,
347 RSB_VALNOTVALID_PREV,
348 RSB_NEW_MASTER,
349 RSB_NEW_MASTER2,
350 RSB_RECOVER_CONVERT,
351 RSB_RECOVER_GRANT,
352 RSB_RECOVER_LVB_INVAL,
353};
354
355static inline void rsb_set_flag(struct dlm_rsb *r, enum rsb_flags flag)
356{
357 __set_bit(flag, &r->res_flags);
358}
359
360static inline void rsb_clear_flag(struct dlm_rsb *r, enum rsb_flags flag)
361{
362 __clear_bit(flag, &r->res_flags);
363}
364
365static inline int rsb_flag(struct dlm_rsb *r, enum rsb_flags flag)
366{
367 return test_bit(flag, &r->res_flags);
368}
369
370
371/* dlm_header is first element of all structs sent between nodes */
372
373#define DLM_HEADER_MAJOR 0x00030000
374#define DLM_HEADER_MINOR 0x00000002
375
376#define DLM_VERSION_3_1 0x00030001
377#define DLM_VERSION_3_2 0x00030002
378
379#define DLM_HEADER_SLOTS 0x00000001
380
381#define DLM_MSG 1
382#define DLM_RCOM 2
383#define DLM_OPTS 3
384#define DLM_ACK 4
385#define DLM_FIN 5
386
387struct dlm_header {
388 uint32_t h_version;
389 union {
390 /* for DLM_MSG and DLM_RCOM */
391 uint32_t h_lockspace;
392 /* for DLM_ACK and DLM_OPTS */
393 uint32_t h_seq;
394 } u;
395 uint32_t h_nodeid; /* nodeid of sender */
396 uint16_t h_length;
397 uint8_t h_cmd; /* DLM_MSG, DLM_RCOM */
398 uint8_t h_pad;
399};
400
401#define DLM_MSG_REQUEST 1
402#define DLM_MSG_CONVERT 2
403#define DLM_MSG_UNLOCK 3
404#define DLM_MSG_CANCEL 4
405#define DLM_MSG_REQUEST_REPLY 5
406#define DLM_MSG_CONVERT_REPLY 6
407#define DLM_MSG_UNLOCK_REPLY 7
408#define DLM_MSG_CANCEL_REPLY 8
409#define DLM_MSG_GRANT 9
410#define DLM_MSG_BAST 10
411#define DLM_MSG_LOOKUP 11
412#define DLM_MSG_REMOVE 12
413#define DLM_MSG_LOOKUP_REPLY 13
414#define DLM_MSG_PURGE 14
415
416struct dlm_message {
417 struct dlm_header m_header;
418 uint32_t m_type; /* DLM_MSG_ */
419 uint32_t m_nodeid;
420 uint32_t m_pid;
421 uint32_t m_lkid; /* lkid on sender */
422 uint32_t m_remid; /* lkid on receiver */
423 uint32_t m_parent_lkid;
424 uint32_t m_parent_remid;
425 uint32_t m_exflags;
426 uint32_t m_sbflags;
427 uint32_t m_flags;
428 uint32_t m_lvbseq;
429 uint32_t m_hash;
430 int m_status;
431 int m_grmode;
432 int m_rqmode;
433 int m_bastmode;
434 int m_asts;
435 int m_result; /* 0 or -EXXX */
436 char m_extra[]; /* name or lvb */
437};
438
439
440#define DLM_RS_NODES 0x00000001
441#define DLM_RS_NODES_ALL 0x00000002
442#define DLM_RS_DIR 0x00000004
443#define DLM_RS_DIR_ALL 0x00000008
444#define DLM_RS_LOCKS 0x00000010
445#define DLM_RS_LOCKS_ALL 0x00000020
446#define DLM_RS_DONE 0x00000040
447#define DLM_RS_DONE_ALL 0x00000080
448
449#define DLM_RCOM_STATUS 1
450#define DLM_RCOM_NAMES 2
451#define DLM_RCOM_LOOKUP 3
452#define DLM_RCOM_LOCK 4
453#define DLM_RCOM_STATUS_REPLY 5
454#define DLM_RCOM_NAMES_REPLY 6
455#define DLM_RCOM_LOOKUP_REPLY 7
456#define DLM_RCOM_LOCK_REPLY 8
457
458struct dlm_rcom {
459 struct dlm_header rc_header;
460 uint32_t rc_type; /* DLM_RCOM_ */
461 int rc_result; /* multi-purpose */
462 uint64_t rc_id; /* match reply with request */
463 uint64_t rc_seq; /* sender's ls_recover_seq */
464 uint64_t rc_seq_reply; /* remote ls_recover_seq */
465 char rc_buf[];
466};
467
468struct dlm_opt_header {
469 uint16_t t_type;
470 uint16_t t_length;
471 uint32_t o_pad;
472 /* need to be 8 byte aligned */
473 char t_value[];
474};
475
476/* encapsulation header */
477struct dlm_opts {
478 struct dlm_header o_header;
479 uint8_t o_nextcmd;
480 uint8_t o_pad;
481 uint16_t o_optlen;
482 uint32_t o_pad2;
483 char o_opts[];
484};
485
486union dlm_packet {
487 struct dlm_header header; /* common to other two */
488 struct dlm_message message;
489 struct dlm_rcom rcom;
490 struct dlm_opts opts;
491};
492
493#define DLM_RSF_NEED_SLOTS 0x00000001
494
495/* RCOM_STATUS data */
496struct rcom_status {
497 __le32 rs_flags;
498 __le32 rs_unused1;
499 __le64 rs_unused2;
500};
501
502/* RCOM_STATUS_REPLY data */
503struct rcom_config {
504 __le32 rf_lvblen;
505 __le32 rf_lsflags;
506
507 /* DLM_HEADER_SLOTS adds: */
508 __le32 rf_flags;
509 __le16 rf_our_slot;
510 __le16 rf_num_slots;
511 __le32 rf_generation;
512 __le32 rf_unused1;
513 __le64 rf_unused2;
514};
515
516struct rcom_slot {
517 __le32 ro_nodeid;
518 __le16 ro_slot;
519 __le16 ro_unused1;
520 __le64 ro_unused2;
521};
522
523struct rcom_lock {
524 __le32 rl_ownpid;
525 __le32 rl_lkid;
526 __le32 rl_remid;
527 __le32 rl_parent_lkid;
528 __le32 rl_parent_remid;
529 __le32 rl_exflags;
530 __le32 rl_flags;
531 __le32 rl_lvbseq;
532 __le32 rl_result;
533 int8_t rl_rqmode;
534 int8_t rl_grmode;
535 int8_t rl_status;
536 int8_t rl_asts;
537 __le16 rl_wait_type;
538 __le16 rl_namelen;
539 char rl_name[DLM_RESNAME_MAXLEN];
540 char rl_lvb[];
541};
542
543/*
544 * The max number of resources per rsbtbl bucket that shrink will attempt
545 * to remove in each iteration.
546 */
547
548#define DLM_REMOVE_NAMES_MAX 8
549
550struct dlm_ls {
551 struct list_head ls_list; /* list of lockspaces */
552 dlm_lockspace_t *ls_local_handle;
553 uint32_t ls_global_id; /* global unique lockspace ID */
554 uint32_t ls_generation;
555 uint32_t ls_exflags;
556 int ls_lvblen;
557 int ls_count; /* refcount of processes in
558 the dlm using this ls */
559 int ls_create_count; /* create/release refcount */
560 unsigned long ls_flags; /* LSFL_ */
561 unsigned long ls_scan_time;
562 struct kobject ls_kobj;
563
564 struct idr ls_lkbidr;
565 spinlock_t ls_lkbidr_spin;
566
567 struct dlm_rsbtable *ls_rsbtbl;
568 uint32_t ls_rsbtbl_size;
569
570 struct mutex ls_waiters_mutex;
571 struct list_head ls_waiters; /* lkbs needing a reply */
572
573 struct mutex ls_orphans_mutex;
574 struct list_head ls_orphans;
575
576 struct mutex ls_timeout_mutex;
577 struct list_head ls_timeout;
578
579 spinlock_t ls_new_rsb_spin;
580 int ls_new_rsb_count;
581 struct list_head ls_new_rsb; /* new rsb structs */
582
583 spinlock_t ls_remove_spin;
584 char ls_remove_name[DLM_RESNAME_MAXLEN+1];
585 char *ls_remove_names[DLM_REMOVE_NAMES_MAX];
586 int ls_remove_len;
587 int ls_remove_lens[DLM_REMOVE_NAMES_MAX];
588
589 struct list_head ls_nodes; /* current nodes in ls */
590 struct list_head ls_nodes_gone; /* dead node list, recovery */
591 int ls_num_nodes; /* number of nodes in ls */
592 int ls_low_nodeid;
593 int ls_total_weight;
594 int *ls_node_array;
595
596 int ls_slot;
597 int ls_num_slots;
598 int ls_slots_size;
599 struct dlm_slot *ls_slots;
600
601 struct dlm_rsb ls_stub_rsb; /* for returning errors */
602 struct dlm_lkb ls_stub_lkb; /* for returning errors */
603 struct dlm_message ls_stub_ms; /* for faking a reply */
604
605 struct dentry *ls_debug_rsb_dentry; /* debugfs */
606 struct dentry *ls_debug_waiters_dentry; /* debugfs */
607 struct dentry *ls_debug_locks_dentry; /* debugfs */
608 struct dentry *ls_debug_all_dentry; /* debugfs */
609 struct dentry *ls_debug_toss_dentry; /* debugfs */
610
611 wait_queue_head_t ls_uevent_wait; /* user part of join/leave */
612 int ls_uevent_result;
613 struct completion ls_members_done;
614 int ls_members_result;
615
616 struct miscdevice ls_device;
617
618 struct workqueue_struct *ls_callback_wq;
619
620 /* recovery related */
621
622 struct mutex ls_cb_mutex;
623 struct list_head ls_cb_delay; /* save for queue_work later */
624 struct timer_list ls_timer;
625 struct task_struct *ls_recoverd_task;
626 struct mutex ls_recoverd_active;
627 spinlock_t ls_recover_lock;
628 unsigned long ls_recover_begin; /* jiffies timestamp */
629 uint32_t ls_recover_status; /* DLM_RS_ */
630 uint64_t ls_recover_seq;
631 struct dlm_recover *ls_recover_args;
632 struct rw_semaphore ls_in_recovery; /* block local requests */
633 struct rw_semaphore ls_recv_active; /* block dlm_recv */
634 struct list_head ls_requestqueue;/* queue remote requests */
635 struct mutex ls_requestqueue_mutex;
636 struct dlm_rcom *ls_recover_buf;
637 int ls_recover_nodeid; /* for debugging */
638 unsigned int ls_recover_dir_sent_res; /* for log info */
639 unsigned int ls_recover_dir_sent_msg; /* for log info */
640 unsigned int ls_recover_locks_in; /* for log info */
641 uint64_t ls_rcom_seq;
642 spinlock_t ls_rcom_spin;
643 struct list_head ls_recover_list;
644 spinlock_t ls_recover_list_lock;
645 int ls_recover_list_count;
646 struct idr ls_recover_idr;
647 spinlock_t ls_recover_idr_lock;
648 wait_queue_head_t ls_wait_general;
649 wait_queue_head_t ls_recover_lock_wait;
650 struct mutex ls_clear_proc_locks;
651
652 struct list_head ls_root_list; /* root resources */
653 struct rw_semaphore ls_root_sem; /* protect root_list */
654
655 const struct dlm_lockspace_ops *ls_ops;
656 void *ls_ops_arg;
657
658 int ls_namelen;
659 char ls_name[1];
660};
661
662/*
663 * LSFL_RECOVER_STOP - dlm_ls_stop() sets this to tell dlm recovery routines
664 * that they should abort what they're doing so new recovery can be started.
665 *
666 * LSFL_RECOVER_DOWN - dlm_ls_stop() sets this to tell dlm_recoverd that it
667 * should do down_write() on the in_recovery rw_semaphore. (doing down_write
668 * within dlm_ls_stop causes complaints about the lock acquired/released
669 * in different contexts.)
670 *
671 * LSFL_RECOVER_LOCK - dlm_recoverd holds the in_recovery rw_semaphore.
672 * It sets this after it is done with down_write() on the in_recovery
673 * rw_semaphore and clears it after it has released the rw_semaphore.
674 *
675 * LSFL_RECOVER_WORK - dlm_ls_start() sets this to tell dlm_recoverd that it
676 * should begin recovery of the lockspace.
677 *
678 * LSFL_RUNNING - set when normal locking activity is enabled.
679 * dlm_ls_stop() clears this to tell dlm locking routines that they should
680 * quit what they are doing so recovery can run. dlm_recoverd sets
681 * this after recovery is finished.
682 */
683
684#define LSFL_RECOVER_STOP 0
685#define LSFL_RECOVER_DOWN 1
686#define LSFL_RECOVER_LOCK 2
687#define LSFL_RECOVER_WORK 3
688#define LSFL_RUNNING 4
689
690#define LSFL_RCOM_READY 5
691#define LSFL_RCOM_WAIT 6
692#define LSFL_UEVENT_WAIT 7
693#define LSFL_TIMEWARN 8
694#define LSFL_CB_DELAY 9
695#define LSFL_NODIR 10
696
697/* much of this is just saving user space pointers associated with the
698 lock that we pass back to the user lib with an ast */
699
700struct dlm_user_args {
701 struct dlm_user_proc *proc; /* each process that opens the lockspace
702 device has private data
703 (dlm_user_proc) on the struct file,
704 the process's locks point back to it*/
705 struct dlm_lksb lksb;
706 struct dlm_lksb __user *user_lksb;
707 void __user *castparam;
708 void __user *castaddr;
709 void __user *bastparam;
710 void __user *bastaddr;
711 uint64_t xid;
712};
713
714#define DLM_PROC_FLAGS_CLOSING 1
715#define DLM_PROC_FLAGS_COMPAT 2
716
717/* locks list is kept so we can remove all a process's locks when it
718 exits (or orphan those that are persistent) */
719
720struct dlm_user_proc {
721 dlm_lockspace_t *lockspace;
722 unsigned long flags; /* DLM_PROC_FLAGS */
723 struct list_head asts;
724 spinlock_t asts_spin;
725 struct list_head locks;
726 spinlock_t locks_spin;
727 struct list_head unlocking;
728 wait_queue_head_t wait;
729};
730
731static inline int dlm_locking_stopped(struct dlm_ls *ls)
732{
733 return !test_bit(LSFL_RUNNING, &ls->ls_flags);
734}
735
736static inline int dlm_recovery_stopped(struct dlm_ls *ls)
737{
738 return test_bit(LSFL_RECOVER_STOP, &ls->ls_flags);
739}
740
741static inline int dlm_no_directory(struct dlm_ls *ls)
742{
743 return test_bit(LSFL_NODIR, &ls->ls_flags);
744}
745
746int dlm_netlink_init(void);
747void dlm_netlink_exit(void);
748void dlm_timeout_warn(struct dlm_lkb *lkb);
749int dlm_plock_init(void);
750void dlm_plock_exit(void);
751
752#ifdef CONFIG_DLM_DEBUG
753void dlm_register_debugfs(void);
754void dlm_unregister_debugfs(void);
755void dlm_create_debug_file(struct dlm_ls *ls);
756void dlm_delete_debug_file(struct dlm_ls *ls);
757void *dlm_create_debug_comms_file(int nodeid, void *data);
758void dlm_delete_debug_comms_file(void *ctx);
759#else
760static inline void dlm_register_debugfs(void) { }
761static inline void dlm_unregister_debugfs(void) { }
762static inline void dlm_create_debug_file(struct dlm_ls *ls) { }
763static inline void dlm_delete_debug_file(struct dlm_ls *ls) { }
764static inline void *dlm_create_debug_comms_file(int nodeid, void *data) { return NULL; }
765static inline void dlm_delete_debug_comms_file(void *ctx) { }
766#endif
767
768#endif /* __DLM_INTERNAL_DOT_H__ */
769