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e7fd4179 DT |
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 | #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26 | /* If the start for which we're re-enabling locking (seq) has been superseded | |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 | static int enable_locking(struct dlm_ls *ls, uint64_t seq) | |
30 | { | |
31 | int error = -EINTR; | |
32 | ||
33 | spin_lock(&ls->ls_recover_lock); | |
34 | if (ls->ls_recover_seq == seq) { | |
35 | set_bit(LSFL_RUNNING, &ls->ls_flags); | |
36 | up_write(&ls->ls_in_recovery); | |
37 | error = 0; | |
38 | } | |
39 | spin_unlock(&ls->ls_recover_lock); | |
40 | return error; | |
41 | } | |
42 | ||
43 | static int ls_recover(struct dlm_ls *ls, struct dlm_recover *rv) | |
44 | { | |
45 | unsigned long start; | |
46 | int error, neg = 0; | |
47 | ||
90135925 | 48 | log_debug(ls, "recover %llx", rv->seq); |
e7fd4179 | 49 | |
90135925 | 50 | mutex_lock(&ls->ls_recoverd_active); |
e7fd4179 DT |
51 | |
52 | /* | |
53 | * Suspending and resuming dlm_astd ensures that no lkb's from this ls | |
54 | * will be processed by dlm_astd during recovery. | |
55 | */ | |
56 | ||
57 | dlm_astd_suspend(); | |
58 | dlm_astd_resume(); | |
59 | ||
60 | /* | |
61 | * This list of root rsb's will be the basis of most of the recovery | |
62 | * routines. | |
63 | */ | |
64 | ||
65 | dlm_create_root_list(ls); | |
66 | ||
67 | /* | |
68 | * Free all the tossed rsb's so we don't have to recover them. | |
69 | */ | |
70 | ||
71 | dlm_clear_toss_list(ls); | |
72 | ||
73 | /* | |
74 | * Add or remove nodes from the lockspace's ls_nodes list. | |
75 | * Also waits for all nodes to complete dlm_recover_members. | |
76 | */ | |
77 | ||
78 | error = dlm_recover_members(ls, rv, &neg); | |
79 | if (error) { | |
80 | log_error(ls, "recover_members failed %d", error); | |
81 | goto fail; | |
82 | } | |
83 | start = jiffies; | |
84 | ||
85 | /* | |
86 | * Rebuild our own share of the directory by collecting from all other | |
87 | * nodes their master rsb names that hash to us. | |
88 | */ | |
89 | ||
90 | error = dlm_recover_directory(ls); | |
91 | if (error) { | |
92 | log_error(ls, "recover_directory failed %d", error); | |
93 | goto fail; | |
94 | } | |
95 | ||
96 | /* | |
97 | * Purge directory-related requests that are saved in requestqueue. | |
98 | * All dir requests from before recovery are invalid now due to the dir | |
99 | * rebuild and will be resent by the requesting nodes. | |
100 | */ | |
101 | ||
102 | dlm_purge_requestqueue(ls); | |
103 | ||
104 | /* | |
105 | * Wait for all nodes to complete directory rebuild. | |
106 | */ | |
107 | ||
108 | error = dlm_recover_directory_wait(ls); | |
109 | if (error) { | |
110 | log_error(ls, "recover_directory_wait failed %d", error); | |
111 | goto fail; | |
112 | } | |
113 | ||
114 | /* | |
115 | * We may have outstanding operations that are waiting for a reply from | |
116 | * a failed node. Mark these to be resent after recovery. Unlock and | |
117 | * cancel ops can just be completed. | |
118 | */ | |
119 | ||
120 | dlm_recover_waiters_pre(ls); | |
121 | ||
122 | error = dlm_recovery_stopped(ls); | |
123 | if (error) | |
124 | goto fail; | |
125 | ||
126 | if (neg || dlm_no_directory(ls)) { | |
127 | /* | |
128 | * Clear lkb's for departed nodes. | |
129 | */ | |
130 | ||
131 | dlm_purge_locks(ls); | |
132 | ||
133 | /* | |
134 | * Get new master nodeid's for rsb's that were mastered on | |
135 | * departed nodes. | |
136 | */ | |
137 | ||
138 | error = dlm_recover_masters(ls); | |
139 | if (error) { | |
140 | log_error(ls, "recover_masters failed %d", error); | |
141 | goto fail; | |
142 | } | |
143 | ||
144 | /* | |
145 | * Send our locks on remastered rsb's to the new masters. | |
146 | */ | |
147 | ||
148 | error = dlm_recover_locks(ls); | |
149 | if (error) { | |
150 | log_error(ls, "recover_locks failed %d", error); | |
151 | goto fail; | |
152 | } | |
153 | ||
154 | error = dlm_recover_locks_wait(ls); | |
155 | if (error) { | |
156 | log_error(ls, "recover_locks_wait failed %d", error); | |
157 | goto fail; | |
158 | } | |
159 | ||
160 | /* | |
161 | * Finalize state in master rsb's now that all locks can be | |
162 | * checked. This includes conversion resolution and lvb | |
163 | * settings. | |
164 | */ | |
165 | ||
166 | dlm_recover_rsbs(ls); | |
91c0dc93 DT |
167 | } else { |
168 | /* | |
169 | * Other lockspace members may be going through the "neg" steps | |
170 | * while also adding us to the lockspace, in which case they'll | |
4b77f2c9 | 171 | * be doing the recover_locks (RS_LOCKS) barrier. |
91c0dc93 DT |
172 | */ |
173 | dlm_set_recover_status(ls, DLM_RS_LOCKS); | |
4b77f2c9 DT |
174 | |
175 | error = dlm_recover_locks_wait(ls); | |
176 | if (error) { | |
177 | log_error(ls, "recover_locks_wait failed %d", error); | |
178 | goto fail; | |
179 | } | |
e7fd4179 DT |
180 | } |
181 | ||
182 | dlm_release_root_list(ls); | |
183 | ||
184 | dlm_set_recover_status(ls, DLM_RS_DONE); | |
185 | error = dlm_recover_done_wait(ls); | |
186 | if (error) { | |
187 | log_error(ls, "recover_done_wait failed %d", error); | |
188 | goto fail; | |
189 | } | |
190 | ||
191 | dlm_clear_members_gone(ls); | |
192 | ||
193 | error = enable_locking(ls, rv->seq); | |
194 | if (error) { | |
195 | log_error(ls, "enable_locking failed %d", error); | |
196 | goto fail; | |
197 | } | |
198 | ||
199 | error = dlm_process_requestqueue(ls); | |
200 | if (error) { | |
201 | log_error(ls, "process_requestqueue failed %d", error); | |
202 | goto fail; | |
203 | } | |
204 | ||
205 | error = dlm_recover_waiters_post(ls); | |
206 | if (error) { | |
207 | log_error(ls, "recover_waiters_post failed %d", error); | |
208 | goto fail; | |
209 | } | |
210 | ||
211 | dlm_grant_after_purge(ls); | |
212 | ||
213 | dlm_astd_wake(); | |
214 | ||
90135925 | 215 | log_debug(ls, "recover %llx done: %u ms", rv->seq, |
e7fd4179 | 216 | jiffies_to_msecs(jiffies - start)); |
90135925 | 217 | mutex_unlock(&ls->ls_recoverd_active); |
e7fd4179 DT |
218 | |
219 | return 0; | |
220 | ||
221 | fail: | |
222 | dlm_release_root_list(ls); | |
90135925 DT |
223 | log_debug(ls, "recover %llx error %d", rv->seq, error); |
224 | mutex_unlock(&ls->ls_recoverd_active); | |
e7fd4179 DT |
225 | return error; |
226 | } | |
227 | ||
2cdc98aa DT |
228 | /* The dlm_ls_start() that created the rv we take here may already have been |
229 | stopped via dlm_ls_stop(); in that case we need to leave the RECOVERY_STOP | |
230 | flag set. */ | |
231 | ||
e7fd4179 DT |
232 | static void do_ls_recovery(struct dlm_ls *ls) |
233 | { | |
234 | struct dlm_recover *rv = NULL; | |
235 | ||
236 | spin_lock(&ls->ls_recover_lock); | |
237 | rv = ls->ls_recover_args; | |
238 | ls->ls_recover_args = NULL; | |
2cdc98aa DT |
239 | if (rv && ls->ls_recover_seq == rv->seq) |
240 | clear_bit(LSFL_RECOVERY_STOP, &ls->ls_flags); | |
e7fd4179 DT |
241 | spin_unlock(&ls->ls_recover_lock); |
242 | ||
243 | if (rv) { | |
244 | ls_recover(ls, rv); | |
245 | kfree(rv->nodeids); | |
246 | kfree(rv); | |
247 | } | |
248 | } | |
249 | ||
250 | static int dlm_recoverd(void *arg) | |
251 | { | |
252 | struct dlm_ls *ls; | |
253 | ||
254 | ls = dlm_find_lockspace_local(arg); | |
5f88f1ea DT |
255 | if (!ls) { |
256 | log_print("dlm_recoverd: no lockspace %p", arg); | |
257 | return -1; | |
258 | } | |
e7fd4179 DT |
259 | |
260 | while (!kthread_should_stop()) { | |
261 | set_current_state(TASK_INTERRUPTIBLE); | |
262 | if (!test_bit(LSFL_WORK, &ls->ls_flags)) | |
263 | schedule(); | |
264 | set_current_state(TASK_RUNNING); | |
265 | ||
266 | if (test_and_clear_bit(LSFL_WORK, &ls->ls_flags)) | |
267 | do_ls_recovery(ls); | |
268 | } | |
269 | ||
270 | dlm_put_lockspace(ls); | |
271 | return 0; | |
272 | } | |
273 | ||
274 | void dlm_recoverd_kick(struct dlm_ls *ls) | |
275 | { | |
276 | set_bit(LSFL_WORK, &ls->ls_flags); | |
277 | wake_up_process(ls->ls_recoverd_task); | |
278 | } | |
279 | ||
280 | int dlm_recoverd_start(struct dlm_ls *ls) | |
281 | { | |
282 | struct task_struct *p; | |
283 | int error = 0; | |
284 | ||
285 | p = kthread_run(dlm_recoverd, ls, "dlm_recoverd"); | |
286 | if (IS_ERR(p)) | |
287 | error = PTR_ERR(p); | |
288 | else | |
289 | ls->ls_recoverd_task = p; | |
290 | return error; | |
291 | } | |
292 | ||
293 | void dlm_recoverd_stop(struct dlm_ls *ls) | |
294 | { | |
295 | kthread_stop(ls->ls_recoverd_task); | |
296 | } | |
297 | ||
298 | void dlm_recoverd_suspend(struct dlm_ls *ls) | |
299 | { | |
f6db1b8e | 300 | wake_up(&ls->ls_wait_general); |
90135925 | 301 | mutex_lock(&ls->ls_recoverd_active); |
e7fd4179 DT |
302 | } |
303 | ||
304 | void dlm_recoverd_resume(struct dlm_ls *ls) | |
305 | { | |
90135925 | 306 | mutex_unlock(&ls->ls_recoverd_active); |
e7fd4179 DT |
307 | } |
308 |