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e7fd4179 DT |
1 | /****************************************************************************** |
2 | ******************************************************************************* | |
3 | ** | |
4 | ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
60f98d18 | 5 | ** Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved. |
e7fd4179 DT |
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26 | /* If the start for which we're re-enabling locking (seq) has been superseded | |
c36258b5 DT |
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. */ | |
e7fd4179 DT |
32 | |
33 | static int enable_locking(struct dlm_ls *ls, uint64_t seq) | |
34 | { | |
35 | int error = -EINTR; | |
36 | ||
c36258b5 DT |
37 | down_write(&ls->ls_recv_active); |
38 | ||
e7fd4179 DT |
39 | spin_lock(&ls->ls_recover_lock); |
40 | if (ls->ls_recover_seq == seq) { | |
41 | set_bit(LSFL_RUNNING, &ls->ls_flags); | |
c36258b5 | 42 | /* unblocks processes waiting to enter the dlm */ |
e7fd4179 DT |
43 | up_write(&ls->ls_in_recovery); |
44 | error = 0; | |
45 | } | |
46 | spin_unlock(&ls->ls_recover_lock); | |
c36258b5 DT |
47 | |
48 | up_write(&ls->ls_recv_active); | |
e7fd4179 DT |
49 | return error; |
50 | } | |
51 | ||
52 | static int ls_recover(struct dlm_ls *ls, struct dlm_recover *rv) | |
53 | { | |
54 | unsigned long start; | |
55 | int error, neg = 0; | |
56 | ||
f95a34c6 | 57 | log_debug(ls, "dlm_recover %llx", (unsigned long long)rv->seq); |
e7fd4179 | 58 | |
90135925 | 59 | mutex_lock(&ls->ls_recoverd_active); |
e7fd4179 | 60 | |
23e8e1aa | 61 | dlm_callback_suspend(ls); |
e7fd4179 DT |
62 | |
63 | /* | |
85f0379a DT |
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. | |
e7fd4179 DT |
66 | */ |
67 | ||
85f0379a | 68 | dlm_clear_toss_list(ls); |
e7fd4179 DT |
69 | |
70 | /* | |
85f0379a DT |
71 | * This list of root rsb's will be the basis of most of the recovery |
72 | * routines. | |
e7fd4179 DT |
73 | */ |
74 | ||
85f0379a | 75 | dlm_create_root_list(ls); |
e7fd4179 DT |
76 | |
77 | /* | |
78 | * Add or remove nodes from the lockspace's ls_nodes list. | |
e7fd4179 DT |
79 | */ |
80 | ||
81 | error = dlm_recover_members(ls, rv, &neg); | |
82 | if (error) { | |
f95a34c6 | 83 | log_debug(ls, "dlm_recover_members error %d", error); |
e7fd4179 DT |
84 | goto fail; |
85 | } | |
f95a34c6 DT |
86 | |
87 | dlm_set_recover_status(ls, DLM_RS_NODES); | |
88 | ||
89 | error = dlm_recover_members_wait(ls); | |
90 | if (error) { | |
91 | log_debug(ls, "dlm_recover_members_wait error %d", error); | |
92 | goto fail; | |
93 | } | |
94 | ||
e7fd4179 DT |
95 | start = jiffies; |
96 | ||
97 | /* | |
98 | * Rebuild our own share of the directory by collecting from all other | |
99 | * nodes their master rsb names that hash to us. | |
100 | */ | |
101 | ||
102 | error = dlm_recover_directory(ls); | |
103 | if (error) { | |
f95a34c6 | 104 | log_debug(ls, "dlm_recover_directory error %d", error); |
e7fd4179 DT |
105 | goto fail; |
106 | } | |
107 | ||
f95a34c6 | 108 | dlm_set_recover_status(ls, DLM_RS_DIR); |
e7fd4179 DT |
109 | |
110 | error = dlm_recover_directory_wait(ls); | |
111 | if (error) { | |
f95a34c6 | 112 | log_debug(ls, "dlm_recover_directory_wait error %d", error); |
e7fd4179 DT |
113 | goto fail; |
114 | } | |
115 | ||
116 | /* | |
117 | * We may have outstanding operations that are waiting for a reply from | |
118 | * a failed node. Mark these to be resent after recovery. Unlock and | |
119 | * cancel ops can just be completed. | |
120 | */ | |
121 | ||
122 | dlm_recover_waiters_pre(ls); | |
123 | ||
124 | error = dlm_recovery_stopped(ls); | |
125 | if (error) | |
126 | goto fail; | |
127 | ||
128 | if (neg || dlm_no_directory(ls)) { | |
129 | /* | |
130 | * Clear lkb's for departed nodes. | |
131 | */ | |
132 | ||
133 | dlm_purge_locks(ls); | |
134 | ||
135 | /* | |
136 | * Get new master nodeid's for rsb's that were mastered on | |
137 | * departed nodes. | |
138 | */ | |
139 | ||
140 | error = dlm_recover_masters(ls); | |
141 | if (error) { | |
f95a34c6 | 142 | log_debug(ls, "dlm_recover_masters error %d", error); |
e7fd4179 DT |
143 | goto fail; |
144 | } | |
145 | ||
146 | /* | |
147 | * Send our locks on remastered rsb's to the new masters. | |
148 | */ | |
149 | ||
150 | error = dlm_recover_locks(ls); | |
151 | if (error) { | |
f95a34c6 | 152 | log_debug(ls, "dlm_recover_locks error %d", error); |
e7fd4179 DT |
153 | goto fail; |
154 | } | |
155 | ||
f95a34c6 DT |
156 | dlm_set_recover_status(ls, DLM_RS_LOCKS); |
157 | ||
e7fd4179 DT |
158 | error = dlm_recover_locks_wait(ls); |
159 | if (error) { | |
f95a34c6 | 160 | log_debug(ls, "dlm_recover_locks_wait error %d", error); |
e7fd4179 DT |
161 | goto fail; |
162 | } | |
163 | ||
164 | /* | |
165 | * Finalize state in master rsb's now that all locks can be | |
166 | * checked. This includes conversion resolution and lvb | |
167 | * settings. | |
168 | */ | |
169 | ||
170 | dlm_recover_rsbs(ls); | |
91c0dc93 DT |
171 | } else { |
172 | /* | |
173 | * Other lockspace members may be going through the "neg" steps | |
174 | * while also adding us to the lockspace, in which case they'll | |
4b77f2c9 | 175 | * be doing the recover_locks (RS_LOCKS) barrier. |
91c0dc93 DT |
176 | */ |
177 | dlm_set_recover_status(ls, DLM_RS_LOCKS); | |
4b77f2c9 DT |
178 | |
179 | error = dlm_recover_locks_wait(ls); | |
180 | if (error) { | |
f95a34c6 | 181 | log_debug(ls, "dlm_recover_locks_wait error %d", error); |
4b77f2c9 DT |
182 | goto fail; |
183 | } | |
e7fd4179 DT |
184 | } |
185 | ||
186 | dlm_release_root_list(ls); | |
187 | ||
2896ee37 DT |
188 | /* |
189 | * Purge directory-related requests that are saved in requestqueue. | |
190 | * All dir requests from before recovery are invalid now due to the dir | |
191 | * rebuild and will be resent by the requesting nodes. | |
192 | */ | |
193 | ||
194 | dlm_purge_requestqueue(ls); | |
195 | ||
e7fd4179 | 196 | dlm_set_recover_status(ls, DLM_RS_DONE); |
f95a34c6 | 197 | |
e7fd4179 DT |
198 | error = dlm_recover_done_wait(ls); |
199 | if (error) { | |
f95a34c6 | 200 | log_debug(ls, "dlm_recover_done_wait error %d", error); |
e7fd4179 DT |
201 | goto fail; |
202 | } | |
203 | ||
204 | dlm_clear_members_gone(ls); | |
205 | ||
3ae1acf9 DT |
206 | dlm_adjust_timeouts(ls); |
207 | ||
23e8e1aa DT |
208 | dlm_callback_resume(ls); |
209 | ||
e7fd4179 DT |
210 | error = enable_locking(ls, rv->seq); |
211 | if (error) { | |
f95a34c6 | 212 | log_debug(ls, "enable_locking error %d", error); |
e7fd4179 DT |
213 | goto fail; |
214 | } | |
215 | ||
216 | error = dlm_process_requestqueue(ls); | |
217 | if (error) { | |
f95a34c6 | 218 | log_debug(ls, "dlm_process_requestqueue error %d", error); |
e7fd4179 DT |
219 | goto fail; |
220 | } | |
221 | ||
222 | error = dlm_recover_waiters_post(ls); | |
223 | if (error) { | |
f95a34c6 | 224 | log_debug(ls, "dlm_recover_waiters_post error %d", error); |
e7fd4179 DT |
225 | goto fail; |
226 | } | |
227 | ||
228 | dlm_grant_after_purge(ls); | |
229 | ||
60f98d18 DT |
230 | log_debug(ls, "dlm_recover %llx generation %u done: %u ms", |
231 | (unsigned long long)rv->seq, ls->ls_generation, | |
e7fd4179 | 232 | jiffies_to_msecs(jiffies - start)); |
90135925 | 233 | mutex_unlock(&ls->ls_recoverd_active); |
e7fd4179 | 234 | |
60f98d18 | 235 | dlm_lsop_recover_done(ls); |
e7fd4179 DT |
236 | return 0; |
237 | ||
238 | fail: | |
239 | dlm_release_root_list(ls); | |
f95a34c6 | 240 | log_debug(ls, "dlm_recover %llx error %d", |
57adf7ee | 241 | (unsigned long long)rv->seq, error); |
90135925 | 242 | mutex_unlock(&ls->ls_recoverd_active); |
e7fd4179 DT |
243 | return error; |
244 | } | |
245 | ||
2cdc98aa DT |
246 | /* The dlm_ls_start() that created the rv we take here may already have been |
247 | stopped via dlm_ls_stop(); in that case we need to leave the RECOVERY_STOP | |
248 | flag set. */ | |
249 | ||
e7fd4179 DT |
250 | static void do_ls_recovery(struct dlm_ls *ls) |
251 | { | |
252 | struct dlm_recover *rv = NULL; | |
253 | ||
254 | spin_lock(&ls->ls_recover_lock); | |
255 | rv = ls->ls_recover_args; | |
256 | ls->ls_recover_args = NULL; | |
2cdc98aa DT |
257 | if (rv && ls->ls_recover_seq == rv->seq) |
258 | clear_bit(LSFL_RECOVERY_STOP, &ls->ls_flags); | |
e7fd4179 DT |
259 | spin_unlock(&ls->ls_recover_lock); |
260 | ||
261 | if (rv) { | |
262 | ls_recover(ls, rv); | |
60f98d18 | 263 | kfree(rv->nodes); |
e7fd4179 DT |
264 | kfree(rv); |
265 | } | |
266 | } | |
267 | ||
268 | static int dlm_recoverd(void *arg) | |
269 | { | |
270 | struct dlm_ls *ls; | |
271 | ||
272 | ls = dlm_find_lockspace_local(arg); | |
5f88f1ea DT |
273 | if (!ls) { |
274 | log_print("dlm_recoverd: no lockspace %p", arg); | |
275 | return -1; | |
276 | } | |
e7fd4179 DT |
277 | |
278 | while (!kthread_should_stop()) { | |
279 | set_current_state(TASK_INTERRUPTIBLE); | |
280 | if (!test_bit(LSFL_WORK, &ls->ls_flags)) | |
281 | schedule(); | |
282 | set_current_state(TASK_RUNNING); | |
283 | ||
284 | if (test_and_clear_bit(LSFL_WORK, &ls->ls_flags)) | |
285 | do_ls_recovery(ls); | |
286 | } | |
287 | ||
288 | dlm_put_lockspace(ls); | |
289 | return 0; | |
290 | } | |
291 | ||
292 | void dlm_recoverd_kick(struct dlm_ls *ls) | |
293 | { | |
294 | set_bit(LSFL_WORK, &ls->ls_flags); | |
295 | wake_up_process(ls->ls_recoverd_task); | |
296 | } | |
297 | ||
298 | int dlm_recoverd_start(struct dlm_ls *ls) | |
299 | { | |
300 | struct task_struct *p; | |
301 | int error = 0; | |
302 | ||
303 | p = kthread_run(dlm_recoverd, ls, "dlm_recoverd"); | |
304 | if (IS_ERR(p)) | |
305 | error = PTR_ERR(p); | |
306 | else | |
307 | ls->ls_recoverd_task = p; | |
308 | return error; | |
309 | } | |
310 | ||
311 | void dlm_recoverd_stop(struct dlm_ls *ls) | |
312 | { | |
313 | kthread_stop(ls->ls_recoverd_task); | |
314 | } | |
315 | ||
316 | void dlm_recoverd_suspend(struct dlm_ls *ls) | |
317 | { | |
f6db1b8e | 318 | wake_up(&ls->ls_wait_general); |
90135925 | 319 | mutex_lock(&ls->ls_recoverd_active); |
e7fd4179 DT |
320 | } |
321 | ||
322 | void dlm_recoverd_resume(struct dlm_ls *ls) | |
323 | { | |
90135925 | 324 | mutex_unlock(&ls->ls_recoverd_active); |
e7fd4179 DT |
325 | } |
326 |