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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#include "dlm_internal.h"
15#include "lockspace.h"
16#include "member.h"
17#include "dir.h"
18#include "ast.h"
19#include "recover.h"
20#include "lowcomms.h"
21#include "lock.h"
22#include "requestqueue.h"
23#include "recoverd.h"
24
25
26/* If the start for which we're re-enabling locking (seq) has been superseded
27 by a newer stop (ls_recover_seq), we need to leave locking disabled.
28
29 We suspend dlm_recv threads here to avoid the race where dlm_recv a) sees
30 locking stopped and b) adds a message to the requestqueue, but dlm_recoverd
31 enables locking and clears the requestqueue between a and b. */
32
33static int enable_locking(struct dlm_ls *ls, uint64_t seq)
34{
35 int error = -EINTR;
36
37 down_write(&ls->ls_recv_active);
38
39 spin_lock(&ls->ls_recover_lock);
40 if (ls->ls_recover_seq == seq) {
41 set_bit(LSFL_RUNNING, &ls->ls_flags);
42 /* unblocks processes waiting to enter the dlm */
43 up_write(&ls->ls_in_recovery);
44 clear_bit(LSFL_RECOVER_LOCK, &ls->ls_flags);
45 error = 0;
46 }
47 spin_unlock(&ls->ls_recover_lock);
48
49 up_write(&ls->ls_recv_active);
50 return error;
51}
52
53static int ls_recover(struct dlm_ls *ls, struct dlm_recover *rv)
54{
55 unsigned long start;
56 int error, neg = 0;
57
58 log_rinfo(ls, "dlm_recover %llu", (unsigned long long)rv->seq);
59
60 mutex_lock(&ls->ls_recoverd_active);
61
62 dlm_callback_suspend(ls);
63
64 dlm_clear_toss(ls);
65
66 /*
67 * This list of root rsb's will be the basis of most of the recovery
68 * routines.
69 */
70
71 dlm_create_root_list(ls);
72
73 /*
74 * Add or remove nodes from the lockspace's ls_nodes list.
75 */
76
77 error = dlm_recover_members(ls, rv, &neg);
78 if (error) {
79 log_rinfo(ls, "dlm_recover_members error %d", error);
80 goto fail;
81 }
82
83 dlm_recover_dir_nodeid(ls);
84
85 ls->ls_recover_dir_sent_res = 0;
86 ls->ls_recover_dir_sent_msg = 0;
87 ls->ls_recover_locks_in = 0;
88
89 dlm_set_recover_status(ls, DLM_RS_NODES);
90
91 error = dlm_recover_members_wait(ls);
92 if (error) {
93 log_rinfo(ls, "dlm_recover_members_wait error %d", error);
94 goto fail;
95 }
96
97 start = jiffies;
98
99 /*
100 * Rebuild our own share of the directory by collecting from all other
101 * nodes their master rsb names that hash to us.
102 */
103
104 error = dlm_recover_directory(ls);
105 if (error) {
106 log_rinfo(ls, "dlm_recover_directory error %d", error);
107 goto fail;
108 }
109
110 dlm_set_recover_status(ls, DLM_RS_DIR);
111
112 error = dlm_recover_directory_wait(ls);
113 if (error) {
114 log_rinfo(ls, "dlm_recover_directory_wait error %d", error);
115 goto fail;
116 }
117
118 log_rinfo(ls, "dlm_recover_directory %u out %u messages",
119 ls->ls_recover_dir_sent_res, ls->ls_recover_dir_sent_msg);
120
121 /*
122 * We may have outstanding operations that are waiting for a reply from
123 * a failed node. Mark these to be resent after recovery. Unlock and
124 * cancel ops can just be completed.
125 */
126
127 dlm_recover_waiters_pre(ls);
128
129 error = dlm_recovery_stopped(ls);
130 if (error)
131 goto fail;
132
133 if (neg || dlm_no_directory(ls)) {
134 /*
135 * Clear lkb's for departed nodes.
136 */
137
138 dlm_recover_purge(ls);
139
140 /*
141 * Get new master nodeid's for rsb's that were mastered on
142 * departed nodes.
143 */
144
145 error = dlm_recover_masters(ls);
146 if (error) {
147 log_rinfo(ls, "dlm_recover_masters error %d", error);
148 goto fail;
149 }
150
151 /*
152 * Send our locks on remastered rsb's to the new masters.
153 */
154
155 error = dlm_recover_locks(ls);
156 if (error) {
157 log_rinfo(ls, "dlm_recover_locks error %d", error);
158 goto fail;
159 }
160
161 dlm_set_recover_status(ls, DLM_RS_LOCKS);
162
163 error = dlm_recover_locks_wait(ls);
164 if (error) {
165 log_rinfo(ls, "dlm_recover_locks_wait error %d", error);
166 goto fail;
167 }
168
169 log_rinfo(ls, "dlm_recover_locks %u in",
170 ls->ls_recover_locks_in);
171
172 /*
173 * Finalize state in master rsb's now that all locks can be
174 * checked. This includes conversion resolution and lvb
175 * settings.
176 */
177
178 dlm_recover_rsbs(ls);
179 } else {
180 /*
181 * Other lockspace members may be going through the "neg" steps
182 * while also adding us to the lockspace, in which case they'll
183 * be doing the recover_locks (RS_LOCKS) barrier.
184 */
185 dlm_set_recover_status(ls, DLM_RS_LOCKS);
186
187 error = dlm_recover_locks_wait(ls);
188 if (error) {
189 log_rinfo(ls, "dlm_recover_locks_wait error %d", error);
190 goto fail;
191 }
192 }
193
194 dlm_release_root_list(ls);
195
196 /*
197 * Purge directory-related requests that are saved in requestqueue.
198 * All dir requests from before recovery are invalid now due to the dir
199 * rebuild and will be resent by the requesting nodes.
200 */
201
202 dlm_purge_requestqueue(ls);
203
204 dlm_set_recover_status(ls, DLM_RS_DONE);
205
206 error = dlm_recover_done_wait(ls);
207 if (error) {
208 log_rinfo(ls, "dlm_recover_done_wait error %d", error);
209 goto fail;
210 }
211
212 dlm_clear_members_gone(ls);
213
214 dlm_adjust_timeouts(ls);
215
216 dlm_callback_resume(ls);
217
218 error = enable_locking(ls, rv->seq);
219 if (error) {
220 log_rinfo(ls, "enable_locking error %d", error);
221 goto fail;
222 }
223
224 error = dlm_process_requestqueue(ls);
225 if (error) {
226 log_rinfo(ls, "dlm_process_requestqueue error %d", error);
227 goto fail;
228 }
229
230 error = dlm_recover_waiters_post(ls);
231 if (error) {
232 log_rinfo(ls, "dlm_recover_waiters_post error %d", error);
233 goto fail;
234 }
235
236 dlm_recover_grant(ls);
237
238 log_rinfo(ls, "dlm_recover %llu generation %u done: %u ms",
239 (unsigned long long)rv->seq, ls->ls_generation,
240 jiffies_to_msecs(jiffies - start));
241 mutex_unlock(&ls->ls_recoverd_active);
242
243 dlm_lsop_recover_done(ls);
244 return 0;
245
246 fail:
247 dlm_release_root_list(ls);
248 log_rinfo(ls, "dlm_recover %llu error %d",
249 (unsigned long long)rv->seq, error);
250 mutex_unlock(&ls->ls_recoverd_active);
251 return error;
252}
253
254/* The dlm_ls_start() that created the rv we take here may already have been
255 stopped via dlm_ls_stop(); in that case we need to leave the RECOVERY_STOP
256 flag set. */
257
258static void do_ls_recovery(struct dlm_ls *ls)
259{
260 struct dlm_recover *rv = NULL;
261
262 spin_lock(&ls->ls_recover_lock);
263 rv = ls->ls_recover_args;
264 ls->ls_recover_args = NULL;
265 if (rv && ls->ls_recover_seq == rv->seq)
266 clear_bit(LSFL_RECOVER_STOP, &ls->ls_flags);
267 spin_unlock(&ls->ls_recover_lock);
268
269 if (rv) {
270 ls_recover(ls, rv);
271 kfree(rv->nodes);
272 kfree(rv);
273 }
274}
275
276static int dlm_recoverd(void *arg)
277{
278 struct dlm_ls *ls;
279
280 ls = dlm_find_lockspace_local(arg);
281 if (!ls) {
282 log_print("dlm_recoverd: no lockspace %p", arg);
283 return -1;
284 }
285
286 down_write(&ls->ls_in_recovery);
287 set_bit(LSFL_RECOVER_LOCK, &ls->ls_flags);
288 wake_up(&ls->ls_recover_lock_wait);
289
290 while (1) {
291 /*
292 * We call kthread_should_stop() after set_current_state().
293 * This is because it works correctly if kthread_stop() is
294 * called just before set_current_state().
295 */
296 set_current_state(TASK_INTERRUPTIBLE);
297 if (kthread_should_stop()) {
298 set_current_state(TASK_RUNNING);
299 break;
300 }
301 if (!test_bit(LSFL_RECOVER_WORK, &ls->ls_flags) &&
302 !test_bit(LSFL_RECOVER_DOWN, &ls->ls_flags)) {
303 if (kthread_should_stop())
304 break;
305 schedule();
306 }
307 set_current_state(TASK_RUNNING);
308
309 if (test_and_clear_bit(LSFL_RECOVER_DOWN, &ls->ls_flags)) {
310 down_write(&ls->ls_in_recovery);
311 set_bit(LSFL_RECOVER_LOCK, &ls->ls_flags);
312 wake_up(&ls->ls_recover_lock_wait);
313 }
314
315 if (test_and_clear_bit(LSFL_RECOVER_WORK, &ls->ls_flags))
316 do_ls_recovery(ls);
317 }
318
319 if (test_bit(LSFL_RECOVER_LOCK, &ls->ls_flags))
320 up_write(&ls->ls_in_recovery);
321
322 dlm_put_lockspace(ls);
323 return 0;
324}
325
326int dlm_recoverd_start(struct dlm_ls *ls)
327{
328 struct task_struct *p;
329 int error = 0;
330
331 p = kthread_run(dlm_recoverd, ls, "dlm_recoverd");
332 if (IS_ERR(p))
333 error = PTR_ERR(p);
334 else
335 ls->ls_recoverd_task = p;
336 return error;
337}
338
339void dlm_recoverd_stop(struct dlm_ls *ls)
340{
341 kthread_stop(ls->ls_recoverd_task);
342}
343
344void dlm_recoverd_suspend(struct dlm_ls *ls)
345{
346 wake_up(&ls->ls_wait_general);
347 mutex_lock(&ls->ls_recoverd_active);
348}
349
350void dlm_recoverd_resume(struct dlm_ls *ls)
351{
352 mutex_unlock(&ls->ls_recoverd_active);
353}
354
1/******************************************************************************
2*******************************************************************************
3**
4** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
5** Copyright (C) 2004-2007 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#include "dlm_internal.h"
15#include "lockspace.h"
16#include "member.h"
17#include "dir.h"
18#include "ast.h"
19#include "recover.h"
20#include "lowcomms.h"
21#include "lock.h"
22#include "requestqueue.h"
23#include "recoverd.h"
24
25
26/* If the start for which we're re-enabling locking (seq) has been superseded
27 by a newer stop (ls_recover_seq), we need to leave locking disabled.
28
29 We suspend dlm_recv threads here to avoid the race where dlm_recv a) sees
30 locking stopped and b) adds a message to the requestqueue, but dlm_recoverd
31 enables locking and clears the requestqueue between a and b. */
32
33static int enable_locking(struct dlm_ls *ls, uint64_t seq)
34{
35 int error = -EINTR;
36
37 down_write(&ls->ls_recv_active);
38
39 spin_lock(&ls->ls_recover_lock);
40 if (ls->ls_recover_seq == seq) {
41 set_bit(LSFL_RUNNING, &ls->ls_flags);
42 /* unblocks processes waiting to enter the dlm */
43 up_write(&ls->ls_in_recovery);
44 error = 0;
45 }
46 spin_unlock(&ls->ls_recover_lock);
47
48 up_write(&ls->ls_recv_active);
49 return error;
50}
51
52static int ls_recover(struct dlm_ls *ls, struct dlm_recover *rv)
53{
54 unsigned long start;
55 int error, neg = 0;
56
57 log_debug(ls, "recover %llx", (unsigned long long)rv->seq);
58
59 mutex_lock(&ls->ls_recoverd_active);
60
61 dlm_callback_suspend(ls);
62
63 /*
64 * Free non-master tossed rsb's. Master rsb's are kept on toss
65 * list and put on root list to be included in resdir recovery.
66 */
67
68 dlm_clear_toss_list(ls);
69
70 /*
71 * This list of root rsb's will be the basis of most of the recovery
72 * routines.
73 */
74
75 dlm_create_root_list(ls);
76
77 /*
78 * Add or remove nodes from the lockspace's ls_nodes list.
79 * Also waits for all nodes to complete dlm_recover_members.
80 */
81
82 error = dlm_recover_members(ls, rv, &neg);
83 if (error) {
84 log_debug(ls, "recover_members failed %d", error);
85 goto fail;
86 }
87 start = jiffies;
88
89 /*
90 * Rebuild our own share of the directory by collecting from all other
91 * nodes their master rsb names that hash to us.
92 */
93
94 error = dlm_recover_directory(ls);
95 if (error) {
96 log_debug(ls, "recover_directory failed %d", error);
97 goto fail;
98 }
99
100 /*
101 * Wait for all nodes to complete directory rebuild.
102 */
103
104 error = dlm_recover_directory_wait(ls);
105 if (error) {
106 log_debug(ls, "recover_directory_wait failed %d", error);
107 goto fail;
108 }
109
110 /*
111 * We may have outstanding operations that are waiting for a reply from
112 * a failed node. Mark these to be resent after recovery. Unlock and
113 * cancel ops can just be completed.
114 */
115
116 dlm_recover_waiters_pre(ls);
117
118 error = dlm_recovery_stopped(ls);
119 if (error)
120 goto fail;
121
122 if (neg || dlm_no_directory(ls)) {
123 /*
124 * Clear lkb's for departed nodes.
125 */
126
127 dlm_purge_locks(ls);
128
129 /*
130 * Get new master nodeid's for rsb's that were mastered on
131 * departed nodes.
132 */
133
134 error = dlm_recover_masters(ls);
135 if (error) {
136 log_debug(ls, "recover_masters failed %d", error);
137 goto fail;
138 }
139
140 /*
141 * Send our locks on remastered rsb's to the new masters.
142 */
143
144 error = dlm_recover_locks(ls);
145 if (error) {
146 log_debug(ls, "recover_locks failed %d", error);
147 goto fail;
148 }
149
150 error = dlm_recover_locks_wait(ls);
151 if (error) {
152 log_debug(ls, "recover_locks_wait failed %d", error);
153 goto fail;
154 }
155
156 /*
157 * Finalize state in master rsb's now that all locks can be
158 * checked. This includes conversion resolution and lvb
159 * settings.
160 */
161
162 dlm_recover_rsbs(ls);
163 } else {
164 /*
165 * Other lockspace members may be going through the "neg" steps
166 * while also adding us to the lockspace, in which case they'll
167 * be doing the recover_locks (RS_LOCKS) barrier.
168 */
169 dlm_set_recover_status(ls, DLM_RS_LOCKS);
170
171 error = dlm_recover_locks_wait(ls);
172 if (error) {
173 log_debug(ls, "recover_locks_wait failed %d", error);
174 goto fail;
175 }
176 }
177
178 dlm_release_root_list(ls);
179
180 /*
181 * Purge directory-related requests that are saved in requestqueue.
182 * All dir requests from before recovery are invalid now due to the dir
183 * rebuild and will be resent by the requesting nodes.
184 */
185
186 dlm_purge_requestqueue(ls);
187
188 dlm_set_recover_status(ls, DLM_RS_DONE);
189 error = dlm_recover_done_wait(ls);
190 if (error) {
191 log_debug(ls, "recover_done_wait failed %d", error);
192 goto fail;
193 }
194
195 dlm_clear_members_gone(ls);
196
197 dlm_adjust_timeouts(ls);
198
199 dlm_callback_resume(ls);
200
201 error = enable_locking(ls, rv->seq);
202 if (error) {
203 log_debug(ls, "enable_locking failed %d", error);
204 goto fail;
205 }
206
207 error = dlm_process_requestqueue(ls);
208 if (error) {
209 log_debug(ls, "process_requestqueue failed %d", error);
210 goto fail;
211 }
212
213 error = dlm_recover_waiters_post(ls);
214 if (error) {
215 log_debug(ls, "recover_waiters_post failed %d", error);
216 goto fail;
217 }
218
219 dlm_grant_after_purge(ls);
220
221 log_debug(ls, "recover %llx done: %u ms",
222 (unsigned long long)rv->seq,
223 jiffies_to_msecs(jiffies - start));
224 mutex_unlock(&ls->ls_recoverd_active);
225
226 return 0;
227
228 fail:
229 dlm_release_root_list(ls);
230 log_debug(ls, "recover %llx error %d",
231 (unsigned long long)rv->seq, error);
232 mutex_unlock(&ls->ls_recoverd_active);
233 return error;
234}
235
236/* The dlm_ls_start() that created the rv we take here may already have been
237 stopped via dlm_ls_stop(); in that case we need to leave the RECOVERY_STOP
238 flag set. */
239
240static void do_ls_recovery(struct dlm_ls *ls)
241{
242 struct dlm_recover *rv = NULL;
243
244 spin_lock(&ls->ls_recover_lock);
245 rv = ls->ls_recover_args;
246 ls->ls_recover_args = NULL;
247 if (rv && ls->ls_recover_seq == rv->seq)
248 clear_bit(LSFL_RECOVERY_STOP, &ls->ls_flags);
249 spin_unlock(&ls->ls_recover_lock);
250
251 if (rv) {
252 ls_recover(ls, rv);
253 kfree(rv->nodeids);
254 kfree(rv->new);
255 kfree(rv);
256 }
257}
258
259static int dlm_recoverd(void *arg)
260{
261 struct dlm_ls *ls;
262
263 ls = dlm_find_lockspace_local(arg);
264 if (!ls) {
265 log_print("dlm_recoverd: no lockspace %p", arg);
266 return -1;
267 }
268
269 while (!kthread_should_stop()) {
270 set_current_state(TASK_INTERRUPTIBLE);
271 if (!test_bit(LSFL_WORK, &ls->ls_flags))
272 schedule();
273 set_current_state(TASK_RUNNING);
274
275 if (test_and_clear_bit(LSFL_WORK, &ls->ls_flags))
276 do_ls_recovery(ls);
277 }
278
279 dlm_put_lockspace(ls);
280 return 0;
281}
282
283void dlm_recoverd_kick(struct dlm_ls *ls)
284{
285 set_bit(LSFL_WORK, &ls->ls_flags);
286 wake_up_process(ls->ls_recoverd_task);
287}
288
289int dlm_recoverd_start(struct dlm_ls *ls)
290{
291 struct task_struct *p;
292 int error = 0;
293
294 p = kthread_run(dlm_recoverd, ls, "dlm_recoverd");
295 if (IS_ERR(p))
296 error = PTR_ERR(p);
297 else
298 ls->ls_recoverd_task = p;
299 return error;
300}
301
302void dlm_recoverd_stop(struct dlm_ls *ls)
303{
304 kthread_stop(ls->ls_recoverd_task);
305}
306
307void dlm_recoverd_suspend(struct dlm_ls *ls)
308{
309 wake_up(&ls->ls_wait_general);
310 mutex_lock(&ls->ls_recoverd_active);
311}
312
313void dlm_recoverd_resume(struct dlm_ls *ls)
314{
315 mutex_unlock(&ls->ls_recoverd_active);
316}
317