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diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h
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1/******************************************************************************
2*******************************************************************************
3**
4** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
5** Copyright (C) 2004-2005 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 <asm/semaphore.h>
39#include <asm/uaccess.h>
40
41#include <linux/dlm.h>
42
43#define DLM_LOCKSPACE_LEN 64
44
45#ifndef TRUE
46#define TRUE 1
47#endif
48
49#ifndef FALSE
50#define FALSE 0
51#endif
52
53#if (BITS_PER_LONG == 64)
54#define PRIx64 "lx"
55#else
56#define PRIx64 "Lx"
57#endif
58
59/* Size of the temp buffer midcomms allocates on the stack.
60 We try to make this large enough so most messages fit.
61 FIXME: should sctp make this unnecessary? */
62
63#define DLM_INBUF_LEN 148
64
65struct dlm_ls;
66struct dlm_lkb;
67struct dlm_rsb;
68struct dlm_member;
69struct dlm_lkbtable;
70struct dlm_rsbtable;
71struct dlm_dirtable;
72struct dlm_direntry;
73struct dlm_recover;
74struct dlm_header;
75struct dlm_message;
76struct dlm_rcom;
77struct dlm_mhandle;
78
79#define log_print(fmt, args...) \
80 printk(KERN_ERR "dlm: "fmt"\n" , ##args)
81#define log_error(ls, fmt, args...) \
82 printk(KERN_ERR "dlm: %s: " fmt "\n", (ls)->ls_name , ##args)
83
84#ifdef DLM_LOG_DEBUG
85#define log_debug(ls, fmt, args...) log_error(ls, fmt, ##args)
86#else
87#define log_debug(ls, fmt, args...)
88#endif
89
90#define DLM_ASSERT(x, do) \
91{ \
92 if (!(x)) \
93 { \
94 printk(KERN_ERR "\nDLM: Assertion failed on line %d of file %s\n" \
95 "DLM: assertion: \"%s\"\n" \
96 "DLM: time = %lu\n", \
97 __LINE__, __FILE__, #x, jiffies); \
98 {do} \
99 printk("\n"); \
100 BUG(); \
101 panic("DLM: Record message above and reboot.\n"); \
102 } \
103}
104
105
106struct dlm_direntry {
107 struct list_head list;
108 uint32_t master_nodeid;
109 uint16_t length;
110 char name[1];
111};
112
113struct dlm_dirtable {
114 struct list_head list;
115 rwlock_t lock;
116};
117
118struct dlm_rsbtable {
119 struct list_head list;
120 struct list_head toss;
121 rwlock_t lock;
122};
123
124struct dlm_lkbtable {
125 struct list_head list;
126 rwlock_t lock;
127 uint16_t counter;
128};
129
130/*
131 * Lockspace member (per node in a ls)
132 */
133
134struct dlm_member {
135 struct list_head list;
136 int nodeid;
137 int weight;
138};
139
140/*
141 * Save and manage recovery state for a lockspace.
142 */
143
144struct dlm_recover {
145 struct list_head list;
146 int *nodeids;
147 int node_count;
148 uint64_t seq;
149};
150
151/*
152 * Pass input args to second stage locking function.
153 */
154
155struct dlm_args {
156 uint32_t flags;
157 void *astaddr;
158 long astparam;
159 void *bastaddr;
160 int mode;
161 struct dlm_lksb *lksb;
162 struct dlm_range *range;
163};
164
165
166/*
167 * Lock block
168 *
169 * A lock can be one of three types:
170 *
171 * local copy lock is mastered locally
172 * (lkb_nodeid is zero and DLM_LKF_MSTCPY is not set)
173 * process copy lock is mastered on a remote node
174 * (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is not set)
175 * master copy master node's copy of a lock owned by remote node
176 * (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is set)
177 *
178 * lkb_exflags: a copy of the most recent flags arg provided to dlm_lock or
179 * dlm_unlock. The dlm does not modify these or use any private flags in
180 * this field; it only contains DLM_LKF_ flags from dlm.h. These flags
181 * are sent as-is to the remote master when the lock is remote.
182 *
183 * lkb_flags: internal dlm flags (DLM_IFL_ prefix) from dlm_internal.h.
184 * Some internal flags are shared between the master and process nodes;
185 * these shared flags are kept in the lower two bytes. One of these
186 * flags set on the master copy will be propagated to the process copy
187 * and v.v. Other internal flags are private to the master or process
188 * node (e.g. DLM_IFL_MSTCPY). These are kept in the high two bytes.
189 *
190 * lkb_sbflags: status block flags. These flags are copied directly into
191 * the caller's lksb.sb_flags prior to the dlm_lock/dlm_unlock completion
192 * ast. All defined in dlm.h with DLM_SBF_ prefix.
193 *
194 * lkb_status: the lock status indicates which rsb queue the lock is
195 * on, grant, convert, or wait. DLM_LKSTS_ WAITING/GRANTED/CONVERT
196 *
197 * lkb_wait_type: the dlm message type (DLM_MSG_ prefix) for which a
198 * reply is needed. Only set when the lkb is on the lockspace waiters
199 * list awaiting a reply from a remote node.
200 *
201 * lkb_nodeid: when the lkb is a local copy, nodeid is 0; when the lkb
202 * is a master copy, nodeid specifies the remote lock holder, when the
203 * lkb is a process copy, the nodeid specifies the lock master.
204 */
205
206/* lkb_ast_type */
207
208#define AST_COMP 1
209#define AST_BAST 2
210
211/* lkb_range[] */
212
213#define GR_RANGE_START 0
214#define GR_RANGE_END 1
215#define RQ_RANGE_START 2
216#define RQ_RANGE_END 3
217
218/* lkb_status */
219
220#define DLM_LKSTS_WAITING 1
221#define DLM_LKSTS_GRANTED 2
222#define DLM_LKSTS_CONVERT 3
223
224/* lkb_flags */
225
226#define DLM_IFL_MSTCPY 0x00010000
227#define DLM_IFL_RESEND 0x00020000
228#define DLM_IFL_RANGE 0x00000001
229
230struct dlm_lkb {
231 struct dlm_rsb *lkb_resource; /* the rsb */
232 struct kref lkb_ref;
233 int lkb_nodeid; /* copied from rsb */
234 int lkb_ownpid; /* pid of lock owner */
235 uint32_t lkb_id; /* our lock ID */
236 uint32_t lkb_remid; /* lock ID on remote partner */
237 uint32_t lkb_exflags; /* external flags from caller */
238 uint32_t lkb_sbflags; /* lksb flags */
239 uint32_t lkb_flags; /* internal flags */
240 uint32_t lkb_lvbseq; /* lvb sequence number */
241
242 int8_t lkb_status; /* granted, waiting, convert */
243 int8_t lkb_rqmode; /* requested lock mode */
244 int8_t lkb_grmode; /* granted lock mode */
245 int8_t lkb_bastmode; /* requested mode */
246 int8_t lkb_highbast; /* highest mode bast sent for */
247
248 int8_t lkb_wait_type; /* type of reply waiting for */
249 int8_t lkb_ast_type; /* type of ast queued for */
250
251 struct list_head lkb_idtbl_list; /* lockspace lkbtbl */
252 struct list_head lkb_statequeue; /* rsb g/c/w list */
253 struct list_head lkb_rsb_lookup; /* waiting for rsb lookup */
254 struct list_head lkb_wait_reply; /* waiting for remote reply */
255 struct list_head lkb_astqueue; /* need ast to be sent */
256
257 uint64_t *lkb_range; /* array of gr/rq ranges */
258 char *lkb_lvbptr;
259 struct dlm_lksb *lkb_lksb; /* caller's status block */
260 void *lkb_astaddr; /* caller's ast function */
261 void *lkb_bastaddr; /* caller's bast function */
262 long lkb_astparam; /* caller's ast arg */
263};
264
265
266struct dlm_rsb {
267 struct dlm_ls *res_ls; /* the lockspace */
268 struct kref res_ref;
269 struct semaphore res_sem;
270 unsigned long res_flags;
271 int res_length; /* length of rsb name */
272 int res_nodeid;
273 uint32_t res_lvbseq;
274 uint32_t res_hash;
275 uint32_t res_bucket; /* rsbtbl */
276 unsigned long res_toss_time;
277 uint32_t res_first_lkid;
278 struct list_head res_lookup; /* lkbs waiting on first */
279 struct list_head res_hashchain; /* rsbtbl */
280 struct list_head res_grantqueue;
281 struct list_head res_convertqueue;
282 struct list_head res_waitqueue;
283
284 struct list_head res_root_list; /* used for recovery */
285 struct list_head res_recover_list; /* used for recovery */
286 int res_recover_locks_count;
287
288 char *res_lvbptr;
289 char res_name[1];
290};
291
292/* find_rsb() flags */
293
294#define R_MASTER 1 /* only return rsb if it's a master */
295#define R_CREATE 2 /* create/add rsb if not found */
296
297/* rsb_flags */
298
299enum rsb_flags {
300 RSB_MASTER_UNCERTAIN,
301 RSB_VALNOTVALID,
302 RSB_VALNOTVALID_PREV,
303 RSB_NEW_MASTER,
304 RSB_NEW_MASTER2,
305 RSB_RECOVER_CONVERT,
306};
307
308static inline void rsb_set_flag(struct dlm_rsb *r, enum rsb_flags flag)
309{
310 __set_bit(flag, &r->res_flags);
311}
312
313static inline void rsb_clear_flag(struct dlm_rsb *r, enum rsb_flags flag)
314{
315 __clear_bit(flag, &r->res_flags);
316}
317
318static inline int rsb_flag(struct dlm_rsb *r, enum rsb_flags flag)
319{
320 return test_bit(flag, &r->res_flags);
321}
322
323
324/* dlm_header is first element of all structs sent between nodes */
325
326#define DLM_HEADER_MAJOR 0x00020000
327#define DLM_HEADER_MINOR 0x00000001
328
329#define DLM_MSG 1
330#define DLM_RCOM 2
331
332struct dlm_header {
333 uint32_t h_version;
334 uint32_t h_lockspace;
335 uint32_t h_nodeid; /* nodeid of sender */
336 uint16_t h_length;
337 uint8_t h_cmd; /* DLM_MSG, DLM_RCOM */
338 uint8_t h_pad;
339};
340
341
342#define DLM_MSG_REQUEST 1
343#define DLM_MSG_CONVERT 2
344#define DLM_MSG_UNLOCK 3
345#define DLM_MSG_CANCEL 4
346#define DLM_MSG_REQUEST_REPLY 5
347#define DLM_MSG_CONVERT_REPLY 6
348#define DLM_MSG_UNLOCK_REPLY 7
349#define DLM_MSG_CANCEL_REPLY 8
350#define DLM_MSG_GRANT 9
351#define DLM_MSG_BAST 10
352#define DLM_MSG_LOOKUP 11
353#define DLM_MSG_REMOVE 12
354#define DLM_MSG_LOOKUP_REPLY 13
355
356struct dlm_message {
357 struct dlm_header m_header;
358 uint32_t m_type; /* DLM_MSG_ */
359 uint32_t m_nodeid;
360 uint32_t m_pid;
361 uint32_t m_lkid; /* lkid on sender */
362 uint32_t m_remid; /* lkid on receiver */
363 uint32_t m_parent_lkid;
364 uint32_t m_parent_remid;
365 uint32_t m_exflags;
366 uint32_t m_sbflags;
367 uint32_t m_flags;
368 uint32_t m_lvbseq;
369 uint32_t m_hash;
370 int m_status;
371 int m_grmode;
372 int m_rqmode;
373 int m_bastmode;
374 int m_asts;
375 int m_result; /* 0 or -EXXX */
376 uint64_t m_range[2];
377 char m_extra[0]; /* name or lvb */
378};
379
380
381#define DLM_RS_NODES 0x00000001
382#define DLM_RS_NODES_ALL 0x00000002
383#define DLM_RS_DIR 0x00000004
384#define DLM_RS_DIR_ALL 0x00000008
385#define DLM_RS_LOCKS 0x00000010
386#define DLM_RS_LOCKS_ALL 0x00000020
387#define DLM_RS_DONE 0x00000040
388#define DLM_RS_DONE_ALL 0x00000080
389
390#define DLM_RCOM_STATUS 1
391#define DLM_RCOM_NAMES 2
392#define DLM_RCOM_LOOKUP 3
393#define DLM_RCOM_LOCK 4
394#define DLM_RCOM_STATUS_REPLY 5
395#define DLM_RCOM_NAMES_REPLY 6
396#define DLM_RCOM_LOOKUP_REPLY 7
397#define DLM_RCOM_LOCK_REPLY 8
398
399struct dlm_rcom {
400 struct dlm_header rc_header;
401 uint32_t rc_type; /* DLM_RCOM_ */
402 int rc_result; /* multi-purpose */
403 uint64_t rc_id; /* match reply with request */
404 char rc_buf[0];
405};
406
407struct rcom_config {
408 uint32_t rf_lvblen;
409 uint32_t rf_lsflags;
410 uint64_t rf_unused;
411};
412
413struct rcom_lock {
414 uint32_t rl_ownpid;
415 uint32_t rl_lkid;
416 uint32_t rl_remid;
417 uint32_t rl_parent_lkid;
418 uint32_t rl_parent_remid;
419 uint32_t rl_exflags;
420 uint32_t rl_flags;
421 uint32_t rl_lvbseq;
422 int rl_result;
423 int8_t rl_rqmode;
424 int8_t rl_grmode;
425 int8_t rl_status;
426 int8_t rl_asts;
427 uint16_t rl_wait_type;
428 uint16_t rl_namelen;
429 uint64_t rl_range[4];
430 char rl_name[DLM_RESNAME_MAXLEN];
431 char rl_lvb[0];
432};
433
434struct dlm_ls {
435 struct list_head ls_list; /* list of lockspaces */
436 uint32_t ls_global_id; /* global unique lockspace ID */
437 uint32_t ls_exflags;
438 int ls_lvblen;
439 int ls_count; /* reference count */
440 unsigned long ls_flags; /* LSFL_ */
441 struct kobject ls_kobj;
442
443 struct dlm_rsbtable *ls_rsbtbl;
444 uint32_t ls_rsbtbl_size;
445
446 struct dlm_lkbtable *ls_lkbtbl;
447 uint32_t ls_lkbtbl_size;
448
449 struct dlm_dirtable *ls_dirtbl;
450 uint32_t ls_dirtbl_size;
451
452 struct semaphore ls_waiters_sem;
453 struct list_head ls_waiters; /* lkbs needing a reply */
454
455 struct list_head ls_nodes; /* current nodes in ls */
456 struct list_head ls_nodes_gone; /* dead node list, recovery */
457 int ls_num_nodes; /* number of nodes in ls */
458 int ls_low_nodeid;
459 int ls_total_weight;
460 int *ls_node_array;
461
462 struct dlm_rsb ls_stub_rsb; /* for returning errors */
463 struct dlm_lkb ls_stub_lkb; /* for returning errors */
464 struct dlm_message ls_stub_ms; /* for faking a reply */
465
466 struct dentry *ls_debug_dentry; /* debugfs */
467
468 wait_queue_head_t ls_uevent_wait; /* user part of join/leave */
469 int ls_uevent_result;
470
471 /* recovery related */
472
473 struct timer_list ls_timer;
474 struct task_struct *ls_recoverd_task;
475 struct semaphore ls_recoverd_active;
476 spinlock_t ls_recover_lock;
477 uint32_t ls_recover_status; /* DLM_RS_ */
478 uint64_t ls_recover_seq;
479 struct dlm_recover *ls_recover_args;
480 struct rw_semaphore ls_in_recovery; /* block local requests */
481 struct list_head ls_requestqueue;/* queue remote requests */
482 struct semaphore ls_requestqueue_lock;
483 char *ls_recover_buf;
484 struct list_head ls_recover_list;
485 spinlock_t ls_recover_list_lock;
486 int ls_recover_list_count;
487 wait_queue_head_t ls_wait_general;
488
489 struct list_head ls_root_list; /* root resources */
490 struct rw_semaphore ls_root_sem; /* protect root_list */
491
492 int ls_namelen;
493 char ls_name[1];
494};
495
496#define LSFL_WORK 0
497#define LSFL_RUNNING 1
498#define LSFL_RECOVERY_STOP 2
499#define LSFL_RCOM_READY 3
500#define LSFL_UEVENT_WAIT 4
501
502static inline int dlm_locking_stopped(struct dlm_ls *ls)
503{
504 return !test_bit(LSFL_RUNNING, &ls->ls_flags);
505}
506
507static inline int dlm_recovery_stopped(struct dlm_ls *ls)
508{
509 return test_bit(LSFL_RECOVERY_STOP, &ls->ls_flags);
510}
511
512static inline int dlm_no_directory(struct dlm_ls *ls)
513{
514 return (ls->ls_exflags & DLM_LSFL_NODIR) ? 1 : 0;
515}
516
517#endif /* __DLM_INTERNAL_DOT_H__ */
518
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