blob: c70c8e58358f8e27a0587c1823aab0a4b292cf3f [file] [log] [blame]
David Teiglande7fd4172006-01-18 09:30:29 +00001/******************************************************************************
2*******************************************************************************
3**
4** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
David Teiglandef0c2bb2007-03-28 09:56:46 -05005** Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
David Teiglande7fd4172006-01-18 09:30:29 +00006**
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>
David Teigland597d0ca2006-07-12 16:44:04 -050038#include <linux/miscdevice.h>
David Teigland90135922006-01-20 08:47:07 +000039#include <linux/mutex.h>
David Teiglande7fd4172006-01-18 09:30:29 +000040#include <asm/semaphore.h>
41#include <asm/uaccess.h>
42
43#include <linux/dlm.h>
David Teigland99fc6482007-01-09 09:44:01 -060044#include "config.h"
David Teiglande7fd4172006-01-18 09:30:29 +000045
46#define DLM_LOCKSPACE_LEN 64
47
David Teiglande7fd4172006-01-18 09:30:29 +000048/* Size of the temp buffer midcomms allocates on the stack.
49 We try to make this large enough so most messages fit.
50 FIXME: should sctp make this unnecessary? */
51
52#define DLM_INBUF_LEN 148
53
54struct dlm_ls;
55struct dlm_lkb;
56struct dlm_rsb;
57struct dlm_member;
58struct dlm_lkbtable;
59struct dlm_rsbtable;
60struct dlm_dirtable;
61struct dlm_direntry;
62struct dlm_recover;
63struct dlm_header;
64struct dlm_message;
65struct dlm_rcom;
66struct dlm_mhandle;
67
68#define log_print(fmt, args...) \
69 printk(KERN_ERR "dlm: "fmt"\n" , ##args)
70#define log_error(ls, fmt, args...) \
71 printk(KERN_ERR "dlm: %s: " fmt "\n", (ls)->ls_name , ##args)
72
David Teigland99fc6482007-01-09 09:44:01 -060073#define log_debug(ls, fmt, args...) \
74do { \
75 if (dlm_config.ci_log_debug) \
76 printk(KERN_DEBUG "dlm: %s: " fmt "\n", \
77 (ls)->ls_name , ##args); \
78} while (0)
David Teiglande7fd4172006-01-18 09:30:29 +000079
80#define DLM_ASSERT(x, do) \
81{ \
82 if (!(x)) \
83 { \
84 printk(KERN_ERR "\nDLM: Assertion failed on line %d of file %s\n" \
85 "DLM: assertion: \"%s\"\n" \
86 "DLM: time = %lu\n", \
87 __LINE__, __FILE__, #x, jiffies); \
88 {do} \
89 printk("\n"); \
90 BUG(); \
91 panic("DLM: Record message above and reboot.\n"); \
92 } \
93}
94
95
96struct dlm_direntry {
97 struct list_head list;
98 uint32_t master_nodeid;
99 uint16_t length;
100 char name[1];
101};
102
103struct dlm_dirtable {
104 struct list_head list;
105 rwlock_t lock;
106};
107
108struct dlm_rsbtable {
109 struct list_head list;
110 struct list_head toss;
111 rwlock_t lock;
112};
113
114struct dlm_lkbtable {
115 struct list_head list;
116 rwlock_t lock;
117 uint16_t counter;
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};
129
130/*
131 * Save and manage recovery state for a lockspace.
132 */
133
134struct dlm_recover {
135 struct list_head list;
David Teiglandd44e0fc2008-03-18 14:22:11 -0500136 int *nodeids; /* nodeids of all members */
David Teiglande7fd4172006-01-18 09:30:29 +0000137 int node_count;
David Teiglandd44e0fc2008-03-18 14:22:11 -0500138 int *new; /* nodeids of new members */
139 int new_count;
David Teiglande7fd4172006-01-18 09:30:29 +0000140 uint64_t seq;
141};
142
143/*
144 * Pass input args to second stage locking function.
145 */
146
147struct dlm_args {
148 uint32_t flags;
David Teiglande5dae542008-02-06 00:35:45 -0600149 void (*astfn) (void *astparam);
150 void *astparam;
151 void (*bastfn) (void *astparam, int mode);
David Teiglande7fd4172006-01-18 09:30:29 +0000152 int mode;
153 struct dlm_lksb *lksb;
David Teiglandd7db9232007-05-18 09:00:32 -0500154 unsigned long timeout;
David Teiglande7fd4172006-01-18 09:30:29 +0000155};
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_ast_type */
199
200#define AST_COMP 1
201#define AST_BAST 2
202
David Teiglande7fd4172006-01-18 09:30:29 +0000203/* lkb_status */
204
205#define DLM_LKSTS_WAITING 1
206#define DLM_LKSTS_GRANTED 2
207#define DLM_LKSTS_CONVERT 3
208
209/* lkb_flags */
210
211#define DLM_IFL_MSTCPY 0x00010000
212#define DLM_IFL_RESEND 0x00020000
David Teigland597d0ca2006-07-12 16:44:04 -0500213#define DLM_IFL_DEAD 0x00040000
David Teiglandef0c2bb2007-03-28 09:56:46 -0500214#define DLM_IFL_OVERLAP_UNLOCK 0x00080000
215#define DLM_IFL_OVERLAP_CANCEL 0x00100000
216#define DLM_IFL_ENDOFLIFE 0x00200000
David Teigland3ae1acf2007-05-18 08:59:31 -0500217#define DLM_IFL_WATCH_TIMEWARN 0x00400000
David Teigland84d8cd62007-05-29 08:44:23 -0500218#define DLM_IFL_TIMEOUT_CANCEL 0x00800000
David Teigland8b4021f2007-05-29 08:46:00 -0500219#define DLM_IFL_DEADLOCK_CANCEL 0x01000000
David Teigland597d0ca2006-07-12 16:44:04 -0500220#define DLM_IFL_USER 0x00000001
221#define DLM_IFL_ORPHAN 0x00000002
David Teiglande7fd4172006-01-18 09:30:29 +0000222
223struct dlm_lkb {
224 struct dlm_rsb *lkb_resource; /* the rsb */
225 struct kref lkb_ref;
226 int lkb_nodeid; /* copied from rsb */
227 int lkb_ownpid; /* pid of lock owner */
228 uint32_t lkb_id; /* our lock ID */
229 uint32_t lkb_remid; /* lock ID on remote partner */
230 uint32_t lkb_exflags; /* external flags from caller */
231 uint32_t lkb_sbflags; /* lksb flags */
232 uint32_t lkb_flags; /* internal flags */
233 uint32_t lkb_lvbseq; /* lvb sequence number */
234
235 int8_t lkb_status; /* granted, waiting, convert */
236 int8_t lkb_rqmode; /* requested lock mode */
237 int8_t lkb_grmode; /* granted lock mode */
238 int8_t lkb_bastmode; /* requested mode */
239 int8_t lkb_highbast; /* highest mode bast sent for */
David Teiglande7fd4172006-01-18 09:30:29 +0000240 int8_t lkb_wait_type; /* type of reply waiting for */
David Teiglandef0c2bb2007-03-28 09:56:46 -0500241 int8_t lkb_wait_count;
David Teiglande7fd4172006-01-18 09:30:29 +0000242 int8_t lkb_ast_type; /* type of ast queued for */
243
244 struct list_head lkb_idtbl_list; /* lockspace lkbtbl */
245 struct list_head lkb_statequeue; /* rsb g/c/w list */
246 struct list_head lkb_rsb_lookup; /* waiting for rsb lookup */
247 struct list_head lkb_wait_reply; /* waiting for remote reply */
248 struct list_head lkb_astqueue; /* need ast to be sent */
David Teigland597d0ca2006-07-12 16:44:04 -0500249 struct list_head lkb_ownqueue; /* list of locks for a process */
David Teigland3ae1acf2007-05-18 08:59:31 -0500250 struct list_head lkb_time_list;
251 unsigned long lkb_timestamp;
252 unsigned long lkb_timeout_cs;
David Teiglande7fd4172006-01-18 09:30:29 +0000253
David Teiglande7fd4172006-01-18 09:30:29 +0000254 char *lkb_lvbptr;
255 struct dlm_lksb *lkb_lksb; /* caller's status block */
David Teiglande5dae542008-02-06 00:35:45 -0600256 void (*lkb_astfn) (void *astparam);
257 void (*lkb_bastfn) (void *astparam, int mode);
David Teiglandd292c0c2008-02-06 23:27:04 -0600258 union {
259 void *lkb_astparam; /* caller's ast arg */
260 struct dlm_user_args *lkb_ua;
261 };
David Teiglande7fd4172006-01-18 09:30:29 +0000262};
263
264
265struct dlm_rsb {
266 struct dlm_ls *res_ls; /* the lockspace */
267 struct kref res_ref;
David Teigland90135922006-01-20 08:47:07 +0000268 struct mutex res_mutex;
David Teiglande7fd4172006-01-18 09:30:29 +0000269 unsigned long res_flags;
270 int res_length; /* length of rsb name */
271 int res_nodeid;
272 uint32_t res_lvbseq;
273 uint32_t res_hash;
274 uint32_t res_bucket; /* rsbtbl */
275 unsigned long res_toss_time;
276 uint32_t res_first_lkid;
277 struct list_head res_lookup; /* lkbs waiting on first */
278 struct list_head res_hashchain; /* rsbtbl */
279 struct list_head res_grantqueue;
280 struct list_head res_convertqueue;
281 struct list_head res_waitqueue;
282
283 struct list_head res_root_list; /* used for recovery */
284 struct list_head res_recover_list; /* used for recovery */
285 int res_recover_locks_count;
286
287 char *res_lvbptr;
288 char res_name[1];
289};
290
291/* find_rsb() flags */
292
293#define R_MASTER 1 /* only return rsb if it's a master */
294#define R_CREATE 2 /* create/add rsb if not found */
295
296/* rsb_flags */
297
298enum rsb_flags {
299 RSB_MASTER_UNCERTAIN,
300 RSB_VALNOTVALID,
301 RSB_VALNOTVALID_PREV,
302 RSB_NEW_MASTER,
303 RSB_NEW_MASTER2,
304 RSB_RECOVER_CONVERT,
David Teigland97a35d12006-05-02 13:34:03 -0400305 RSB_LOCKS_PURGED,
David Teiglande7fd4172006-01-18 09:30:29 +0000306};
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
David Teigland38aa8b02006-12-13 10:37:16 -0600326#define DLM_HEADER_MAJOR 0x00030000
327#define DLM_HEADER_MINOR 0x00000000
David Teiglande7fd4172006-01-18 09:30:29 +0000328
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
David Teigland84991372007-03-30 15:02:40 -0500355#define DLM_MSG_PURGE 14
David Teiglande7fd4172006-01-18 09:30:29 +0000356
357struct dlm_message {
358 struct dlm_header m_header;
359 uint32_t m_type; /* DLM_MSG_ */
360 uint32_t m_nodeid;
361 uint32_t m_pid;
362 uint32_t m_lkid; /* lkid on sender */
363 uint32_t m_remid; /* lkid on receiver */
364 uint32_t m_parent_lkid;
365 uint32_t m_parent_remid;
366 uint32_t m_exflags;
367 uint32_t m_sbflags;
368 uint32_t m_flags;
369 uint32_t m_lvbseq;
370 uint32_t m_hash;
371 int m_status;
372 int m_grmode;
373 int m_rqmode;
374 int m_bastmode;
375 int m_asts;
376 int m_result; /* 0 or -EXXX */
David Teiglande7fd4172006-01-18 09:30:29 +0000377 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 */
David Teigland38aa8b02006-12-13 10:37:16 -0600404 uint64_t rc_seq; /* sender's ls_recover_seq */
405 uint64_t rc_seq_reply; /* remote ls_recover_seq */
David Teiglande7fd4172006-01-18 09:30:29 +0000406 char rc_buf[0];
407};
408
Al Viroeef7d732008-01-25 00:58:46 -0500409union dlm_packet {
410 struct dlm_header header; /* common to other two */
411 struct dlm_message message;
412 struct dlm_rcom rcom;
413};
414
David Teiglande7fd4172006-01-18 09:30:29 +0000415struct rcom_config {
Al Viro93ff2972008-01-25 02:34:00 -0500416 __le32 rf_lvblen;
417 __le32 rf_lsflags;
418 __le64 rf_unused;
David Teiglande7fd4172006-01-18 09:30:29 +0000419};
420
421struct rcom_lock {
Al Viro163a1852008-01-25 02:08:26 -0500422 __le32 rl_ownpid;
423 __le32 rl_lkid;
424 __le32 rl_remid;
425 __le32 rl_parent_lkid;
426 __le32 rl_parent_remid;
427 __le32 rl_exflags;
428 __le32 rl_flags;
429 __le32 rl_lvbseq;
430 __le32 rl_result;
David Teiglande7fd4172006-01-18 09:30:29 +0000431 int8_t rl_rqmode;
432 int8_t rl_grmode;
433 int8_t rl_status;
434 int8_t rl_asts;
Al Viro163a1852008-01-25 02:08:26 -0500435 __le16 rl_wait_type;
436 __le16 rl_namelen;
David Teiglande7fd4172006-01-18 09:30:29 +0000437 char rl_name[DLM_RESNAME_MAXLEN];
438 char rl_lvb[0];
439};
440
441struct dlm_ls {
442 struct list_head ls_list; /* list of lockspaces */
David Teigland597d0ca2006-07-12 16:44:04 -0500443 dlm_lockspace_t *ls_local_handle;
David Teiglande7fd4172006-01-18 09:30:29 +0000444 uint32_t ls_global_id; /* global unique lockspace ID */
445 uint32_t ls_exflags;
446 int ls_lvblen;
447 int ls_count; /* reference count */
448 unsigned long ls_flags; /* LSFL_ */
449 struct kobject ls_kobj;
450
451 struct dlm_rsbtable *ls_rsbtbl;
452 uint32_t ls_rsbtbl_size;
453
454 struct dlm_lkbtable *ls_lkbtbl;
455 uint32_t ls_lkbtbl_size;
456
457 struct dlm_dirtable *ls_dirtbl;
458 uint32_t ls_dirtbl_size;
459
David Teigland90135922006-01-20 08:47:07 +0000460 struct mutex ls_waiters_mutex;
David Teiglande7fd4172006-01-18 09:30:29 +0000461 struct list_head ls_waiters; /* lkbs needing a reply */
462
David Teiglandef0c2bb2007-03-28 09:56:46 -0500463 struct mutex ls_orphans_mutex;
464 struct list_head ls_orphans;
465
David Teigland3ae1acf2007-05-18 08:59:31 -0500466 struct mutex ls_timeout_mutex;
467 struct list_head ls_timeout;
468
David Teiglande7fd4172006-01-18 09:30:29 +0000469 struct list_head ls_nodes; /* current nodes in ls */
470 struct list_head ls_nodes_gone; /* dead node list, recovery */
471 int ls_num_nodes; /* number of nodes in ls */
472 int ls_low_nodeid;
473 int ls_total_weight;
474 int *ls_node_array;
Patrick Caulfield44f487a2007-06-06 09:21:22 -0500475 gfp_t ls_allocation;
David Teiglande7fd4172006-01-18 09:30:29 +0000476
477 struct dlm_rsb ls_stub_rsb; /* for returning errors */
478 struct dlm_lkb ls_stub_lkb; /* for returning errors */
479 struct dlm_message ls_stub_ms; /* for faking a reply */
480
David Teigland5de63192006-07-25 13:44:31 -0500481 struct dentry *ls_debug_rsb_dentry; /* debugfs */
482 struct dentry *ls_debug_waiters_dentry; /* debugfs */
David Teiglandac90a252007-07-06 09:47:08 -0500483 struct dentry *ls_debug_locks_dentry; /* debugfs */
David Teiglande7fd4172006-01-18 09:30:29 +0000484
485 wait_queue_head_t ls_uevent_wait; /* user part of join/leave */
486 int ls_uevent_result;
David Teigland8b0e7b22007-05-18 09:03:35 -0500487 struct completion ls_members_done;
488 int ls_members_result;
David Teiglande7fd4172006-01-18 09:30:29 +0000489
David Teigland597d0ca2006-07-12 16:44:04 -0500490 struct miscdevice ls_device;
491
David Teiglande7fd4172006-01-18 09:30:29 +0000492 /* recovery related */
493
494 struct timer_list ls_timer;
495 struct task_struct *ls_recoverd_task;
David Teigland90135922006-01-20 08:47:07 +0000496 struct mutex ls_recoverd_active;
David Teiglande7fd4172006-01-18 09:30:29 +0000497 spinlock_t ls_recover_lock;
David Teigland3ae1acf2007-05-18 08:59:31 -0500498 unsigned long ls_recover_begin; /* jiffies timestamp */
David Teiglande7fd4172006-01-18 09:30:29 +0000499 uint32_t ls_recover_status; /* DLM_RS_ */
500 uint64_t ls_recover_seq;
501 struct dlm_recover *ls_recover_args;
502 struct rw_semaphore ls_in_recovery; /* block local requests */
David Teiglandc36258b2007-09-27 15:53:38 -0500503 struct rw_semaphore ls_recv_active; /* block dlm_recv */
David Teiglande7fd4172006-01-18 09:30:29 +0000504 struct list_head ls_requestqueue;/* queue remote requests */
David Teigland90135922006-01-20 08:47:07 +0000505 struct mutex ls_requestqueue_mutex;
Al Viro40076852008-01-25 03:01:51 -0500506 struct dlm_rcom *ls_recover_buf;
David Teiglandfaa0f262006-08-08 17:08:42 -0500507 int ls_recover_nodeid; /* for debugging */
David Teigland4a99c3d2006-08-09 11:20:15 -0500508 uint64_t ls_rcom_seq;
David Teigland98f176f2006-11-27 13:19:28 -0600509 spinlock_t ls_rcom_spin;
David Teiglande7fd4172006-01-18 09:30:29 +0000510 struct list_head ls_recover_list;
511 spinlock_t ls_recover_list_lock;
512 int ls_recover_list_count;
513 wait_queue_head_t ls_wait_general;
David Teigland597d0ca2006-07-12 16:44:04 -0500514 struct mutex ls_clear_proc_locks;
David Teiglande7fd4172006-01-18 09:30:29 +0000515
516 struct list_head ls_root_list; /* root resources */
517 struct rw_semaphore ls_root_sem; /* protect root_list */
518
519 int ls_namelen;
520 char ls_name[1];
521};
522
523#define LSFL_WORK 0
524#define LSFL_RUNNING 1
525#define LSFL_RECOVERY_STOP 2
526#define LSFL_RCOM_READY 3
David Teigland98f176f2006-11-27 13:19:28 -0600527#define LSFL_RCOM_WAIT 4
528#define LSFL_UEVENT_WAIT 5
David Teigland3ae1acf2007-05-18 08:59:31 -0500529#define LSFL_TIMEWARN 6
David Teiglande7fd4172006-01-18 09:30:29 +0000530
David Teigland597d0ca2006-07-12 16:44:04 -0500531/* much of this is just saving user space pointers associated with the
532 lock that we pass back to the user lib with an ast */
533
534struct dlm_user_args {
535 struct dlm_user_proc *proc; /* each process that opens the lockspace
536 device has private data
537 (dlm_user_proc) on the struct file,
538 the process's locks point back to it*/
539 struct dlm_lksb lksb;
540 int old_mode;
541 int update_user_lvb;
542 struct dlm_lksb __user *user_lksb;
543 void __user *castparam;
544 void __user *castaddr;
545 void __user *bastparam;
546 void __user *bastaddr;
David Teiglandd7db9232007-05-18 09:00:32 -0500547 uint64_t xid;
David Teigland597d0ca2006-07-12 16:44:04 -0500548};
549
550#define DLM_PROC_FLAGS_CLOSING 1
551#define DLM_PROC_FLAGS_COMPAT 2
552
553/* locks list is kept so we can remove all a process's locks when it
554 exits (or orphan those that are persistent) */
555
556struct dlm_user_proc {
557 dlm_lockspace_t *lockspace;
558 unsigned long flags; /* DLM_PROC_FLAGS */
559 struct list_head asts;
560 spinlock_t asts_spin;
561 struct list_head locks;
562 spinlock_t locks_spin;
David Teiglanda1bc86e2007-01-15 10:34:52 -0600563 struct list_head unlocking;
David Teigland597d0ca2006-07-12 16:44:04 -0500564 wait_queue_head_t wait;
565};
566
David Teiglande7fd4172006-01-18 09:30:29 +0000567static inline int dlm_locking_stopped(struct dlm_ls *ls)
568{
569 return !test_bit(LSFL_RUNNING, &ls->ls_flags);
570}
571
572static inline int dlm_recovery_stopped(struct dlm_ls *ls)
573{
574 return test_bit(LSFL_RECOVERY_STOP, &ls->ls_flags);
575}
576
577static inline int dlm_no_directory(struct dlm_ls *ls)
578{
579 return (ls->ls_exflags & DLM_LSFL_NODIR) ? 1 : 0;
580}
581
Adrian Bunke0283982007-11-03 01:04:30 +0100582int dlm_netlink_init(void);
583void dlm_netlink_exit(void);
584void dlm_timeout_warn(struct dlm_lkb *lkb);
585
586#ifdef CONFIG_DLM_DEBUG
587int dlm_register_debugfs(void);
588void dlm_unregister_debugfs(void);
589int dlm_create_debug_file(struct dlm_ls *ls);
590void dlm_delete_debug_file(struct dlm_ls *ls);
591#else
592static inline int dlm_register_debugfs(void) { return 0; }
593static inline void dlm_unregister_debugfs(void) { }
594static inline int dlm_create_debug_file(struct dlm_ls *ls) { return 0; }
595static inline void dlm_delete_debug_file(struct dlm_ls *ls) { }
596#endif
597
David Teiglande7fd4172006-01-18 09:30:29 +0000598#endif /* __DLM_INTERNAL_DOT_H__ */
599