blob: 748e8d59e61113b8491fd896d2439ac5853ea5d1 [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 Teigland60f98d12011-11-02 14:30:58 -05005** Copyright (C) 2004-2011 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
David Teiglande7fd4172006-01-18 09:30:29 +000021#include <linux/slab.h>
22#include <linux/sched.h>
23#include <linux/types.h>
24#include <linux/ctype.h>
25#include <linux/spinlock.h>
26#include <linux/vmalloc.h>
27#include <linux/list.h>
28#include <linux/errno.h>
29#include <linux/random.h>
30#include <linux/delay.h>
31#include <linux/socket.h>
32#include <linux/kthread.h>
33#include <linux/kobject.h>
34#include <linux/kref.h>
35#include <linux/kernel.h>
36#include <linux/jhash.h>
David Teigland597d0ca2006-07-12 16:44:04 -050037#include <linux/miscdevice.h>
David Teigland90135922006-01-20 08:47:07 +000038#include <linux/mutex.h>
David Teigland3d6aa672011-07-06 17:00:54 -050039#include <linux/idr.h>
David Teiglandd6e24782012-04-23 13:58:42 -050040#include <linux/ratelimit.h>
Linus Torvalds7c0f6ba2016-12-24 11:46:01 -080041#include <linux/uaccess.h>
David Teiglande7fd4172006-01-18 09:30:29 +000042
43#include <linux/dlm.h>
David Teigland99fc6482007-01-09 09:44:01 -060044#include "config.h"
David Teiglande7fd4172006-01-18 09:30:29 +000045
David Teiglande7fd4172006-01-18 09:30:29 +000046/* Size of the temp buffer midcomms allocates on the stack.
47 We try to make this large enough so most messages fit.
48 FIXME: should sctp make this unnecessary? */
49
50#define DLM_INBUF_LEN 148
51
52struct dlm_ls;
53struct dlm_lkb;
54struct dlm_rsb;
55struct dlm_member;
David Teiglande7fd4172006-01-18 09:30:29 +000056struct dlm_rsbtable;
David Teiglande7fd4172006-01-18 09:30:29 +000057struct dlm_recover;
58struct dlm_header;
59struct dlm_message;
60struct dlm_rcom;
61struct dlm_mhandle;
62
63#define log_print(fmt, args...) \
64 printk(KERN_ERR "dlm: "fmt"\n" , ##args)
65#define log_error(ls, fmt, args...) \
66 printk(KERN_ERR "dlm: %s: " fmt "\n", (ls)->ls_name , ##args)
Zhilong Liu505ee522016-06-19 23:52:46 -050067
David Teigland075f0172014-02-14 11:54:44 -060068#define log_rinfo(ls, fmt, args...) \
Zhilong Liu505ee522016-06-19 23:52:46 -050069do { \
70 if (dlm_config.ci_log_info) \
71 printk(KERN_INFO "dlm: %s: " fmt "\n", \
72 (ls)->ls_name, ##args); \
73 else if (dlm_config.ci_log_debug) \
74 printk(KERN_DEBUG "dlm: %s: " fmt "\n", \
75 (ls)->ls_name , ##args); \
76} while (0)
David Teiglande7fd4172006-01-18 09:30:29 +000077
David Teigland99fc6482007-01-09 09:44:01 -060078#define log_debug(ls, fmt, args...) \
79do { \
80 if (dlm_config.ci_log_debug) \
81 printk(KERN_DEBUG "dlm: %s: " fmt "\n", \
82 (ls)->ls_name , ##args); \
83} while (0)
David Teiglande7fd4172006-01-18 09:30:29 +000084
David Teiglandd6e24782012-04-23 13:58:42 -050085#define log_limit(ls, fmt, args...) \
86do { \
87 if (dlm_config.ci_log_debug) \
88 printk_ratelimited(KERN_DEBUG "dlm: %s: " fmt "\n", \
89 (ls)->ls_name , ##args); \
90} while (0)
91
David Teiglande7fd4172006-01-18 09:30:29 +000092#define DLM_ASSERT(x, do) \
93{ \
94 if (!(x)) \
95 { \
96 printk(KERN_ERR "\nDLM: Assertion failed on line %d of file %s\n" \
97 "DLM: assertion: \"%s\"\n" \
98 "DLM: time = %lu\n", \
99 __LINE__, __FILE__, #x, jiffies); \
100 {do} \
101 printk("\n"); \
102 BUG(); \
103 panic("DLM: Record message above and reboot.\n"); \
104 } \
105}
106
107
David Teiglandf1172282013-01-07 11:03:42 -0600108#define DLM_RTF_SHRINK 0x00000001
109
David Teiglande7fd4172006-01-18 09:30:29 +0000110struct dlm_rsbtable {
Bob Peterson9beb3bf2011-10-26 15:24:55 -0500111 struct rb_root keep;
112 struct rb_root toss;
David Teiglandc7be7612009-01-07 16:50:41 -0600113 spinlock_t lock;
David Teiglandf1172282013-01-07 11:03:42 -0600114 uint32_t flags;
David Teiglande7fd4172006-01-18 09:30:29 +0000115};
116
David Teiglande7fd4172006-01-18 09:30:29 +0000117
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;
David Teigland757a4272011-10-20 13:26:28 -0500126 int slot;
127 int slot_prev;
David Teigland60f98d12011-11-02 14:30:58 -0500128 int comm_seq;
David Teigland757a4272011-10-20 13:26:28 -0500129 uint32_t generation;
130};
131
132/*
David Teiglande7fd4172006-01-18 09:30:29 +0000133 * Save and manage recovery state for a lockspace.
134 */
135
136struct dlm_recover {
137 struct list_head list;
David Teigland60f98d12011-11-02 14:30:58 -0500138 struct dlm_config_node *nodes;
139 int nodes_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
David Teiglande7fd4172006-01-18 09:30:29 +0000198/* 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
David Teigland597d0ca2006-07-12 16:44:04 -0500208#define DLM_IFL_DEAD 0x00040000
David Teiglandef0c2bb2007-03-28 09:56:46 -0500209#define DLM_IFL_OVERLAP_UNLOCK 0x00080000
210#define DLM_IFL_OVERLAP_CANCEL 0x00100000
211#define DLM_IFL_ENDOFLIFE 0x00200000
David Teigland3ae1acf2007-05-18 08:59:31 -0500212#define DLM_IFL_WATCH_TIMEWARN 0x00400000
David Teigland84d8cd62007-05-29 08:44:23 -0500213#define DLM_IFL_TIMEOUT_CANCEL 0x00800000
David Teigland8b4021f2007-05-29 08:46:00 -0500214#define DLM_IFL_DEADLOCK_CANCEL 0x01000000
David Teigland2a7ce0e2011-04-04 15:19:59 -0500215#define DLM_IFL_STUB_MS 0x02000000 /* magic number for m_flags */
David Teigland597d0ca2006-07-12 16:44:04 -0500216#define DLM_IFL_USER 0x00000001
217#define DLM_IFL_ORPHAN 0x00000002
David Teiglande7fd4172006-01-18 09:30:29 +0000218
David Teigland8304d6f2011-02-21 14:58:21 -0600219#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
David Teiglande7fd4172006-01-18 09:30:29 +0000233struct 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 */
David Teiglande7fd4172006-01-18 09:30:29 +0000248 int8_t lkb_highbast; /* highest mode bast sent for */
David Teigland7fe2b312010-02-24 11:08:18 -0600249
David Teiglande7fd4172006-01-18 09:30:29 +0000250 int8_t lkb_wait_type; /* type of reply waiting for */
David Teiglandef0c2bb2007-03-28 09:56:46 -0500251 int8_t lkb_wait_count;
David Teiglandc6ff6692011-03-28 14:17:26 -0500252 int lkb_wait_nodeid; /* for debugging */
David Teiglande7fd4172006-01-18 09:30:29 +0000253
David Teiglande7fd4172006-01-18 09:30:29 +0000254 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 */
David Teigland597d0ca2006-07-12 16:44:04 -0500257 struct list_head lkb_ownqueue; /* list of locks for a process */
David Teigland3ae1acf2007-05-18 08:59:31 -0500258 struct list_head lkb_time_list;
David Teiglandeeda4182008-12-09 14:12:21 -0600259 ktime_t lkb_timestamp;
David Teiglandc6ff6692011-03-28 14:17:26 -0500260 ktime_t lkb_wait_time;
David Teigland3ae1acf2007-05-18 08:59:31 -0500261 unsigned long lkb_timeout_cs;
David Teiglande7fd4172006-01-18 09:30:29 +0000262
David Teigland23e8e1a2011-04-05 13:16:24 -0500263 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 */
David Teigland8304d6f2011-02-21 14:58:21 -0600266 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
David Teigland48756472012-04-26 15:54:29 -0500272 uint64_t lkb_recover_seq; /* from ls_recover_seq */
273
David Teiglande7fd4172006-01-18 09:30:29 +0000274 char *lkb_lvbptr;
275 struct dlm_lksb *lkb_lksb; /* caller's status block */
David Teiglande5dae542008-02-06 00:35:45 -0600276 void (*lkb_astfn) (void *astparam);
277 void (*lkb_bastfn) (void *astparam, int mode);
David Teiglandd292c0c2008-02-06 23:27:04 -0600278 union {
279 void *lkb_astparam; /* caller's ast arg */
280 struct dlm_user_args *lkb_ua;
281 };
David Teiglande7fd4172006-01-18 09:30:29 +0000282};
283
David Teiglandc04fecb2012-05-10 10:18:07 -0500284/*
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 */
David Teiglande7fd4172006-01-18 09:30:29 +0000293
294struct dlm_rsb {
295 struct dlm_ls *res_ls; /* the lockspace */
296 struct kref res_ref;
David Teigland90135922006-01-20 08:47:07 +0000297 struct mutex res_mutex;
David Teiglande7fd4172006-01-18 09:30:29 +0000298 unsigned long res_flags;
299 int res_length; /* length of rsb name */
300 int res_nodeid;
David Teiglandc04fecb2012-05-10 10:18:07 -0500301 int res_master_nodeid;
302 int res_dir_nodeid;
David Teigland1d7c4842012-05-15 16:07:49 -0500303 int res_id; /* for ls_recover_idr */
David Teiglande7fd4172006-01-18 09:30:29 +0000304 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 */
Bob Peterson9beb3bf2011-10-26 15:24:55 -0500310 union {
311 struct list_head res_hashchain;
312 struct rb_node res_hashnode; /* rsbtbl */
313 };
David Teiglande7fd4172006-01-18 09:30:29 +0000314 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;
David Teigland3881ac02011-07-07 14:05:03 -0500323 char res_name[DLM_RESNAME_MAXLEN+1];
David Teiglande7fd4172006-01-18 09:30:29 +0000324};
325
David Teiglandc04fecb2012-05-10 10:18:07 -0500326/* 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
David Teiglande7fd4172006-01-18 09:30:29 +0000336/* find_rsb() flags */
337
David Teiglandc04fecb2012-05-10 10:18:07 -0500338#define R_REQUEST 0x00000001
339#define R_RECEIVE_REQUEST 0x00000002
340#define R_RECEIVE_RECOVER 0x00000004
David Teiglande7fd4172006-01-18 09:30:29 +0000341
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,
David Teigland48756472012-04-26 15:54:29 -0500351 RSB_RECOVER_GRANT,
David Teiglandda8c6662012-11-15 15:01:51 -0600352 RSB_RECOVER_LVB_INVAL,
David Teiglande7fd4172006-01-18 09:30:29 +0000353};
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
David Teigland38aa8b02006-12-13 10:37:16 -0600373#define DLM_HEADER_MAJOR 0x00030000
David Teigland757a4272011-10-20 13:26:28 -0500374#define DLM_HEADER_MINOR 0x00000001
375
376#define DLM_HEADER_SLOTS 0x00000001
David Teiglande7fd4172006-01-18 09:30:29 +0000377
378#define DLM_MSG 1
379#define DLM_RCOM 2
380
381struct dlm_header {
382 uint32_t h_version;
383 uint32_t h_lockspace;
384 uint32_t h_nodeid; /* nodeid of sender */
385 uint16_t h_length;
386 uint8_t h_cmd; /* DLM_MSG, DLM_RCOM */
387 uint8_t h_pad;
388};
389
390
391#define DLM_MSG_REQUEST 1
392#define DLM_MSG_CONVERT 2
393#define DLM_MSG_UNLOCK 3
394#define DLM_MSG_CANCEL 4
395#define DLM_MSG_REQUEST_REPLY 5
396#define DLM_MSG_CONVERT_REPLY 6
397#define DLM_MSG_UNLOCK_REPLY 7
398#define DLM_MSG_CANCEL_REPLY 8
399#define DLM_MSG_GRANT 9
400#define DLM_MSG_BAST 10
401#define DLM_MSG_LOOKUP 11
402#define DLM_MSG_REMOVE 12
403#define DLM_MSG_LOOKUP_REPLY 13
David Teigland84991372007-03-30 15:02:40 -0500404#define DLM_MSG_PURGE 14
David Teiglande7fd4172006-01-18 09:30:29 +0000405
406struct dlm_message {
407 struct dlm_header m_header;
408 uint32_t m_type; /* DLM_MSG_ */
409 uint32_t m_nodeid;
410 uint32_t m_pid;
411 uint32_t m_lkid; /* lkid on sender */
412 uint32_t m_remid; /* lkid on receiver */
413 uint32_t m_parent_lkid;
414 uint32_t m_parent_remid;
415 uint32_t m_exflags;
416 uint32_t m_sbflags;
417 uint32_t m_flags;
418 uint32_t m_lvbseq;
419 uint32_t m_hash;
420 int m_status;
421 int m_grmode;
422 int m_rqmode;
423 int m_bastmode;
424 int m_asts;
425 int m_result; /* 0 or -EXXX */
David Teiglande7fd4172006-01-18 09:30:29 +0000426 char m_extra[0]; /* name or lvb */
427};
428
429
430#define DLM_RS_NODES 0x00000001
431#define DLM_RS_NODES_ALL 0x00000002
432#define DLM_RS_DIR 0x00000004
433#define DLM_RS_DIR_ALL 0x00000008
434#define DLM_RS_LOCKS 0x00000010
435#define DLM_RS_LOCKS_ALL 0x00000020
436#define DLM_RS_DONE 0x00000040
437#define DLM_RS_DONE_ALL 0x00000080
438
439#define DLM_RCOM_STATUS 1
440#define DLM_RCOM_NAMES 2
441#define DLM_RCOM_LOOKUP 3
442#define DLM_RCOM_LOCK 4
443#define DLM_RCOM_STATUS_REPLY 5
444#define DLM_RCOM_NAMES_REPLY 6
445#define DLM_RCOM_LOOKUP_REPLY 7
446#define DLM_RCOM_LOCK_REPLY 8
447
448struct dlm_rcom {
449 struct dlm_header rc_header;
450 uint32_t rc_type; /* DLM_RCOM_ */
451 int rc_result; /* multi-purpose */
452 uint64_t rc_id; /* match reply with request */
David Teigland38aa8b02006-12-13 10:37:16 -0600453 uint64_t rc_seq; /* sender's ls_recover_seq */
454 uint64_t rc_seq_reply; /* remote ls_recover_seq */
David Teiglande7fd4172006-01-18 09:30:29 +0000455 char rc_buf[0];
456};
457
Al Viroeef7d732008-01-25 00:58:46 -0500458union dlm_packet {
459 struct dlm_header header; /* common to other two */
460 struct dlm_message message;
461 struct dlm_rcom rcom;
462};
463
David Teigland757a4272011-10-20 13:26:28 -0500464#define DLM_RSF_NEED_SLOTS 0x00000001
465
466/* RCOM_STATUS data */
467struct rcom_status {
468 __le32 rs_flags;
469 __le32 rs_unused1;
470 __le64 rs_unused2;
471};
472
473/* RCOM_STATUS_REPLY data */
David Teiglande7fd4172006-01-18 09:30:29 +0000474struct rcom_config {
Al Viro93ff2972008-01-25 02:34:00 -0500475 __le32 rf_lvblen;
476 __le32 rf_lsflags;
David Teigland757a4272011-10-20 13:26:28 -0500477
478 /* DLM_HEADER_SLOTS adds: */
479 __le32 rf_flags;
480 __le16 rf_our_slot;
481 __le16 rf_num_slots;
482 __le32 rf_generation;
483 __le32 rf_unused1;
484 __le64 rf_unused2;
485};
486
487struct rcom_slot {
488 __le32 ro_nodeid;
489 __le16 ro_slot;
490 __le16 ro_unused1;
491 __le64 ro_unused2;
David Teiglande7fd4172006-01-18 09:30:29 +0000492};
493
494struct rcom_lock {
Al Viro163a1852008-01-25 02:08:26 -0500495 __le32 rl_ownpid;
496 __le32 rl_lkid;
497 __le32 rl_remid;
498 __le32 rl_parent_lkid;
499 __le32 rl_parent_remid;
500 __le32 rl_exflags;
501 __le32 rl_flags;
502 __le32 rl_lvbseq;
503 __le32 rl_result;
David Teiglande7fd4172006-01-18 09:30:29 +0000504 int8_t rl_rqmode;
505 int8_t rl_grmode;
506 int8_t rl_status;
507 int8_t rl_asts;
Al Viro163a1852008-01-25 02:08:26 -0500508 __le16 rl_wait_type;
509 __le16 rl_namelen;
David Teiglande7fd4172006-01-18 09:30:29 +0000510 char rl_name[DLM_RESNAME_MAXLEN];
511 char rl_lvb[0];
512};
513
David Teigland05c32f42012-06-14 12:17:32 -0500514/*
515 * The max number of resources per rsbtbl bucket that shrink will attempt
516 * to remove in each iteration.
517 */
518
519#define DLM_REMOVE_NAMES_MAX 8
520
David Teiglande7fd4172006-01-18 09:30:29 +0000521struct dlm_ls {
522 struct list_head ls_list; /* list of lockspaces */
David Teigland597d0ca2006-07-12 16:44:04 -0500523 dlm_lockspace_t *ls_local_handle;
David Teiglande7fd4172006-01-18 09:30:29 +0000524 uint32_t ls_global_id; /* global unique lockspace ID */
David Teigland757a4272011-10-20 13:26:28 -0500525 uint32_t ls_generation;
David Teiglande7fd4172006-01-18 09:30:29 +0000526 uint32_t ls_exflags;
527 int ls_lvblen;
David Teigland0f8e0d92008-08-06 13:30:24 -0500528 int ls_count; /* refcount of processes in
529 the dlm using this ls */
530 int ls_create_count; /* create/release refcount */
David Teiglande7fd4172006-01-18 09:30:29 +0000531 unsigned long ls_flags; /* LSFL_ */
David Teiglandc1dcf652008-08-18 14:03:25 -0500532 unsigned long ls_scan_time;
David Teiglande7fd4172006-01-18 09:30:29 +0000533 struct kobject ls_kobj;
534
David Teigland3d6aa672011-07-06 17:00:54 -0500535 struct idr ls_lkbidr;
536 spinlock_t ls_lkbidr_spin;
537
David Teiglande7fd4172006-01-18 09:30:29 +0000538 struct dlm_rsbtable *ls_rsbtbl;
539 uint32_t ls_rsbtbl_size;
540
David Teigland90135922006-01-20 08:47:07 +0000541 struct mutex ls_waiters_mutex;
David Teiglande7fd4172006-01-18 09:30:29 +0000542 struct list_head ls_waiters; /* lkbs needing a reply */
543
David Teiglandef0c2bb2007-03-28 09:56:46 -0500544 struct mutex ls_orphans_mutex;
545 struct list_head ls_orphans;
546
David Teigland3ae1acf2007-05-18 08:59:31 -0500547 struct mutex ls_timeout_mutex;
548 struct list_head ls_timeout;
549
David Teigland3881ac02011-07-07 14:05:03 -0500550 spinlock_t ls_new_rsb_spin;
551 int ls_new_rsb_count;
552 struct list_head ls_new_rsb; /* new rsb structs */
553
David Teigland05c32f42012-06-14 12:17:32 -0500554 spinlock_t ls_remove_spin;
555 char ls_remove_name[DLM_RESNAME_MAXLEN+1];
556 char *ls_remove_names[DLM_REMOVE_NAMES_MAX];
557 int ls_remove_len;
558 int ls_remove_lens[DLM_REMOVE_NAMES_MAX];
559
David Teiglande7fd4172006-01-18 09:30:29 +0000560 struct list_head ls_nodes; /* current nodes in ls */
561 struct list_head ls_nodes_gone; /* dead node list, recovery */
562 int ls_num_nodes; /* number of nodes in ls */
563 int ls_low_nodeid;
564 int ls_total_weight;
565 int *ls_node_array;
566
David Teigland757a4272011-10-20 13:26:28 -0500567 int ls_slot;
568 int ls_num_slots;
569 int ls_slots_size;
570 struct dlm_slot *ls_slots;
571
David Teiglande7fd4172006-01-18 09:30:29 +0000572 struct dlm_rsb ls_stub_rsb; /* for returning errors */
573 struct dlm_lkb ls_stub_lkb; /* for returning errors */
574 struct dlm_message ls_stub_ms; /* for faking a reply */
575
David Teigland5de63192006-07-25 13:44:31 -0500576 struct dentry *ls_debug_rsb_dentry; /* debugfs */
577 struct dentry *ls_debug_waiters_dentry; /* debugfs */
David Teiglandac90a252007-07-06 09:47:08 -0500578 struct dentry *ls_debug_locks_dentry; /* debugfs */
David Teiglandd0225092008-12-16 14:53:23 -0600579 struct dentry *ls_debug_all_dentry; /* debugfs */
David Teiglandc04fecb2012-05-10 10:18:07 -0500580 struct dentry *ls_debug_toss_dentry; /* debugfs */
David Teiglande7fd4172006-01-18 09:30:29 +0000581
582 wait_queue_head_t ls_uevent_wait; /* user part of join/leave */
583 int ls_uevent_result;
David Teigland8b0e7b22007-05-18 09:03:35 -0500584 struct completion ls_members_done;
585 int ls_members_result;
David Teiglande7fd4172006-01-18 09:30:29 +0000586
David Teigland597d0ca2006-07-12 16:44:04 -0500587 struct miscdevice ls_device;
588
David Teigland23e8e1a2011-04-05 13:16:24 -0500589 struct workqueue_struct *ls_callback_wq;
590
David Teiglande7fd4172006-01-18 09:30:29 +0000591 /* recovery related */
592
David Teigland23e8e1a2011-04-05 13:16:24 -0500593 struct mutex ls_cb_mutex;
594 struct list_head ls_cb_delay; /* save for queue_work later */
David Teiglande7fd4172006-01-18 09:30:29 +0000595 struct timer_list ls_timer;
596 struct task_struct *ls_recoverd_task;
David Teigland90135922006-01-20 08:47:07 +0000597 struct mutex ls_recoverd_active;
David Teiglande7fd4172006-01-18 09:30:29 +0000598 spinlock_t ls_recover_lock;
David Teigland3ae1acf2007-05-18 08:59:31 -0500599 unsigned long ls_recover_begin; /* jiffies timestamp */
David Teiglande7fd4172006-01-18 09:30:29 +0000600 uint32_t ls_recover_status; /* DLM_RS_ */
601 uint64_t ls_recover_seq;
602 struct dlm_recover *ls_recover_args;
603 struct rw_semaphore ls_in_recovery; /* block local requests */
David Teiglandc36258b2007-09-27 15:53:38 -0500604 struct rw_semaphore ls_recv_active; /* block dlm_recv */
David Teiglande7fd4172006-01-18 09:30:29 +0000605 struct list_head ls_requestqueue;/* queue remote requests */
David Teigland90135922006-01-20 08:47:07 +0000606 struct mutex ls_requestqueue_mutex;
Al Viro40076852008-01-25 03:01:51 -0500607 struct dlm_rcom *ls_recover_buf;
David Teiglandfaa0f262006-08-08 17:08:42 -0500608 int ls_recover_nodeid; /* for debugging */
David Teiglandc04fecb2012-05-10 10:18:07 -0500609 unsigned int ls_recover_dir_sent_res; /* for log info */
610 unsigned int ls_recover_dir_sent_msg; /* for log info */
David Teigland48756472012-04-26 15:54:29 -0500611 unsigned int ls_recover_locks_in; /* for log info */
David Teigland4a99c3d2006-08-09 11:20:15 -0500612 uint64_t ls_rcom_seq;
David Teigland98f176f2006-11-27 13:19:28 -0600613 spinlock_t ls_rcom_spin;
David Teiglande7fd4172006-01-18 09:30:29 +0000614 struct list_head ls_recover_list;
615 spinlock_t ls_recover_list_lock;
616 int ls_recover_list_count;
David Teigland1d7c4842012-05-15 16:07:49 -0500617 struct idr ls_recover_idr;
618 spinlock_t ls_recover_idr_lock;
David Teiglande7fd4172006-01-18 09:30:29 +0000619 wait_queue_head_t ls_wait_general;
David Teigland475f2302012-08-02 11:08:21 -0500620 wait_queue_head_t ls_recover_lock_wait;
David Teigland597d0ca2006-07-12 16:44:04 -0500621 struct mutex ls_clear_proc_locks;
David Teiglande7fd4172006-01-18 09:30:29 +0000622
623 struct list_head ls_root_list; /* root resources */
624 struct rw_semaphore ls_root_sem; /* protect root_list */
625
David Teigland60f98d12011-11-02 14:30:58 -0500626 const struct dlm_lockspace_ops *ls_ops;
627 void *ls_ops_arg;
628
David Teiglande7fd4172006-01-18 09:30:29 +0000629 int ls_namelen;
630 char ls_name[1];
631};
632
David Teigland475f2302012-08-02 11:08:21 -0500633/*
634 * LSFL_RECOVER_STOP - dlm_ls_stop() sets this to tell dlm recovery routines
635 * that they should abort what they're doing so new recovery can be started.
636 *
637 * LSFL_RECOVER_DOWN - dlm_ls_stop() sets this to tell dlm_recoverd that it
638 * should do down_write() on the in_recovery rw_semaphore. (doing down_write
639 * within dlm_ls_stop causes complaints about the lock acquired/released
640 * in different contexts.)
641 *
642 * LSFL_RECOVER_LOCK - dlm_recoverd holds the in_recovery rw_semaphore.
643 * It sets this after it is done with down_write() on the in_recovery
644 * rw_semaphore and clears it after it has released the rw_semaphore.
645 *
646 * LSFL_RECOVER_WORK - dlm_ls_start() sets this to tell dlm_recoverd that it
647 * should begin recovery of the lockspace.
648 *
649 * LSFL_RUNNING - set when normal locking activity is enabled.
650 * dlm_ls_stop() clears this to tell dlm locking routines that they should
651 * quit what they are doing so recovery can run. dlm_recoverd sets
652 * this after recovery is finished.
653 */
654
655#define LSFL_RECOVER_STOP 0
656#define LSFL_RECOVER_DOWN 1
657#define LSFL_RECOVER_LOCK 2
658#define LSFL_RECOVER_WORK 3
659#define LSFL_RUNNING 4
660
661#define LSFL_RCOM_READY 5
662#define LSFL_RCOM_WAIT 6
663#define LSFL_UEVENT_WAIT 7
664#define LSFL_TIMEWARN 8
665#define LSFL_CB_DELAY 9
666#define LSFL_NODIR 10
David Teiglande7fd4172006-01-18 09:30:29 +0000667
David Teigland597d0ca2006-07-12 16:44:04 -0500668/* much of this is just saving user space pointers associated with the
669 lock that we pass back to the user lib with an ast */
670
671struct dlm_user_args {
672 struct dlm_user_proc *proc; /* each process that opens the lockspace
673 device has private data
674 (dlm_user_proc) on the struct file,
675 the process's locks point back to it*/
676 struct dlm_lksb lksb;
David Teigland597d0ca2006-07-12 16:44:04 -0500677 struct dlm_lksb __user *user_lksb;
678 void __user *castparam;
679 void __user *castaddr;
680 void __user *bastparam;
681 void __user *bastaddr;
David Teiglandd7db9232007-05-18 09:00:32 -0500682 uint64_t xid;
David Teigland597d0ca2006-07-12 16:44:04 -0500683};
684
685#define DLM_PROC_FLAGS_CLOSING 1
686#define DLM_PROC_FLAGS_COMPAT 2
687
688/* locks list is kept so we can remove all a process's locks when it
689 exits (or orphan those that are persistent) */
690
691struct dlm_user_proc {
692 dlm_lockspace_t *lockspace;
693 unsigned long flags; /* DLM_PROC_FLAGS */
694 struct list_head asts;
695 spinlock_t asts_spin;
696 struct list_head locks;
697 spinlock_t locks_spin;
David Teiglanda1bc86e2007-01-15 10:34:52 -0600698 struct list_head unlocking;
David Teigland597d0ca2006-07-12 16:44:04 -0500699 wait_queue_head_t wait;
700};
701
David Teiglande7fd4172006-01-18 09:30:29 +0000702static inline int dlm_locking_stopped(struct dlm_ls *ls)
703{
704 return !test_bit(LSFL_RUNNING, &ls->ls_flags);
705}
706
707static inline int dlm_recovery_stopped(struct dlm_ls *ls)
708{
David Teigland475f2302012-08-02 11:08:21 -0500709 return test_bit(LSFL_RECOVER_STOP, &ls->ls_flags);
David Teiglande7fd4172006-01-18 09:30:29 +0000710}
711
712static inline int dlm_no_directory(struct dlm_ls *ls)
713{
David Teigland48756472012-04-26 15:54:29 -0500714 return test_bit(LSFL_NODIR, &ls->ls_flags);
David Teiglande7fd4172006-01-18 09:30:29 +0000715}
716
Adrian Bunke0283982007-11-03 01:04:30 +0100717int dlm_netlink_init(void);
718void dlm_netlink_exit(void);
719void dlm_timeout_warn(struct dlm_lkb *lkb);
David Teigland24022112008-03-14 15:09:15 -0500720int dlm_plock_init(void);
721void dlm_plock_exit(void);
Adrian Bunke0283982007-11-03 01:04:30 +0100722
723#ifdef CONFIG_DLM_DEBUG
724int dlm_register_debugfs(void);
725void dlm_unregister_debugfs(void);
726int dlm_create_debug_file(struct dlm_ls *ls);
727void dlm_delete_debug_file(struct dlm_ls *ls);
728#else
729static inline int dlm_register_debugfs(void) { return 0; }
730static inline void dlm_unregister_debugfs(void) { }
731static inline int dlm_create_debug_file(struct dlm_ls *ls) { return 0; }
732static inline void dlm_delete_debug_file(struct dlm_ls *ls) { }
733#endif
734
David Teiglande7fd4172006-01-18 09:30:29 +0000735#endif /* __DLM_INTERNAL_DOT_H__ */
736