blob: 3cb636d6024912b8aa96b55f6e0c731c11d56b82 [file] [log] [blame]
David Teiglande7fd4172006-01-18 09:30:29 +00001/******************************************************************************
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26/* If the start for which we're re-enabling locking (seq) has been superseded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
29static 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
43static int ls_recover(struct dlm_ls *ls, struct dlm_recover *rv)
44{
45 unsigned long start;
46 int error, neg = 0;
47
Ryusuke Konishi57adf7e2006-11-29 09:33:48 -050048 log_debug(ls, "recover %llx", (unsigned long long)rv->seq);
David Teiglande7fd4172006-01-18 09:30:29 +000049
David Teigland90135922006-01-20 08:47:07 +000050 mutex_lock(&ls->ls_recoverd_active);
David Teiglande7fd4172006-01-18 09:30:29 +000051
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) {
David Teigland8ec68862007-01-09 09:38:39 -060080 log_debug(ls, "recover_members failed %d", error);
David Teiglande7fd4172006-01-18 09:30:29 +000081 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) {
David Teigland8ec68862007-01-09 09:38:39 -060092 log_debug(ls, "recover_directory failed %d", error);
David Teiglande7fd4172006-01-18 09:30:29 +000093 goto fail;
94 }
95
96 /*
David Teiglande7fd4172006-01-18 09:30:29 +000097 * Wait for all nodes to complete directory rebuild.
98 */
99
100 error = dlm_recover_directory_wait(ls);
101 if (error) {
David Teigland8ec68862007-01-09 09:38:39 -0600102 log_debug(ls, "recover_directory_wait failed %d", error);
David Teiglande7fd4172006-01-18 09:30:29 +0000103 goto fail;
104 }
105
106 /*
107 * We may have outstanding operations that are waiting for a reply from
108 * a failed node. Mark these to be resent after recovery. Unlock and
109 * cancel ops can just be completed.
110 */
111
112 dlm_recover_waiters_pre(ls);
113
114 error = dlm_recovery_stopped(ls);
115 if (error)
116 goto fail;
117
118 if (neg || dlm_no_directory(ls)) {
119 /*
120 * Clear lkb's for departed nodes.
121 */
122
123 dlm_purge_locks(ls);
124
125 /*
126 * Get new master nodeid's for rsb's that were mastered on
127 * departed nodes.
128 */
129
130 error = dlm_recover_masters(ls);
131 if (error) {
David Teigland8ec68862007-01-09 09:38:39 -0600132 log_debug(ls, "recover_masters failed %d", error);
David Teiglande7fd4172006-01-18 09:30:29 +0000133 goto fail;
134 }
135
136 /*
137 * Send our locks on remastered rsb's to the new masters.
138 */
139
140 error = dlm_recover_locks(ls);
141 if (error) {
David Teigland8ec68862007-01-09 09:38:39 -0600142 log_debug(ls, "recover_locks failed %d", error);
David Teiglande7fd4172006-01-18 09:30:29 +0000143 goto fail;
144 }
145
146 error = dlm_recover_locks_wait(ls);
147 if (error) {
David Teigland8ec68862007-01-09 09:38:39 -0600148 log_debug(ls, "recover_locks_wait failed %d", error);
David Teiglande7fd4172006-01-18 09:30:29 +0000149 goto fail;
150 }
151
152 /*
153 * Finalize state in master rsb's now that all locks can be
154 * checked. This includes conversion resolution and lvb
155 * settings.
156 */
157
158 dlm_recover_rsbs(ls);
David Teigland91c0dc92006-10-31 11:56:01 -0600159 } else {
160 /*
161 * Other lockspace members may be going through the "neg" steps
162 * while also adding us to the lockspace, in which case they'll
David Teigland4b77f2c2006-11-01 09:31:48 -0600163 * be doing the recover_locks (RS_LOCKS) barrier.
David Teigland91c0dc92006-10-31 11:56:01 -0600164 */
165 dlm_set_recover_status(ls, DLM_RS_LOCKS);
David Teigland4b77f2c2006-11-01 09:31:48 -0600166
167 error = dlm_recover_locks_wait(ls);
168 if (error) {
David Teigland8ec68862007-01-09 09:38:39 -0600169 log_debug(ls, "recover_locks_wait failed %d", error);
David Teigland4b77f2c2006-11-01 09:31:48 -0600170 goto fail;
171 }
David Teiglande7fd4172006-01-18 09:30:29 +0000172 }
173
174 dlm_release_root_list(ls);
175
David Teigland2896ee32006-11-27 11:31:22 -0600176 /*
177 * Purge directory-related requests that are saved in requestqueue.
178 * All dir requests from before recovery are invalid now due to the dir
179 * rebuild and will be resent by the requesting nodes.
180 */
181
182 dlm_purge_requestqueue(ls);
183
David Teiglande7fd4172006-01-18 09:30:29 +0000184 dlm_set_recover_status(ls, DLM_RS_DONE);
185 error = dlm_recover_done_wait(ls);
186 if (error) {
David Teigland8ec68862007-01-09 09:38:39 -0600187 log_debug(ls, "recover_done_wait failed %d", error);
David Teiglande7fd4172006-01-18 09:30:29 +0000188 goto fail;
189 }
190
191 dlm_clear_members_gone(ls);
192
193 error = enable_locking(ls, rv->seq);
194 if (error) {
David Teigland8ec68862007-01-09 09:38:39 -0600195 log_debug(ls, "enable_locking failed %d", error);
David Teiglande7fd4172006-01-18 09:30:29 +0000196 goto fail;
197 }
198
199 error = dlm_process_requestqueue(ls);
200 if (error) {
David Teigland8ec68862007-01-09 09:38:39 -0600201 log_debug(ls, "process_requestqueue failed %d", error);
David Teiglande7fd4172006-01-18 09:30:29 +0000202 goto fail;
203 }
204
205 error = dlm_recover_waiters_post(ls);
206 if (error) {
David Teigland8ec68862007-01-09 09:38:39 -0600207 log_debug(ls, "recover_waiters_post failed %d", error);
David Teiglande7fd4172006-01-18 09:30:29 +0000208 goto fail;
209 }
210
211 dlm_grant_after_purge(ls);
212
213 dlm_astd_wake();
214
Ryusuke Konishi57adf7e2006-11-29 09:33:48 -0500215 log_debug(ls, "recover %llx done: %u ms",
216 (unsigned long long)rv->seq,
David Teiglande7fd4172006-01-18 09:30:29 +0000217 jiffies_to_msecs(jiffies - start));
David Teigland90135922006-01-20 08:47:07 +0000218 mutex_unlock(&ls->ls_recoverd_active);
David Teiglande7fd4172006-01-18 09:30:29 +0000219
220 return 0;
221
222 fail:
223 dlm_release_root_list(ls);
Ryusuke Konishi57adf7e2006-11-29 09:33:48 -0500224 log_debug(ls, "recover %llx error %d",
225 (unsigned long long)rv->seq, error);
David Teigland90135922006-01-20 08:47:07 +0000226 mutex_unlock(&ls->ls_recoverd_active);
David Teiglande7fd4172006-01-18 09:30:29 +0000227 return error;
228}
229
David Teigland2cdc98a2006-10-31 11:56:08 -0600230/* The dlm_ls_start() that created the rv we take here may already have been
231 stopped via dlm_ls_stop(); in that case we need to leave the RECOVERY_STOP
232 flag set. */
233
David Teiglande7fd4172006-01-18 09:30:29 +0000234static void do_ls_recovery(struct dlm_ls *ls)
235{
236 struct dlm_recover *rv = NULL;
237
238 spin_lock(&ls->ls_recover_lock);
239 rv = ls->ls_recover_args;
240 ls->ls_recover_args = NULL;
David Teigland2cdc98a2006-10-31 11:56:08 -0600241 if (rv && ls->ls_recover_seq == rv->seq)
242 clear_bit(LSFL_RECOVERY_STOP, &ls->ls_flags);
David Teiglande7fd4172006-01-18 09:30:29 +0000243 spin_unlock(&ls->ls_recover_lock);
244
245 if (rv) {
246 ls_recover(ls, rv);
247 kfree(rv->nodeids);
248 kfree(rv);
249 }
250}
251
252static int dlm_recoverd(void *arg)
253{
254 struct dlm_ls *ls;
255
256 ls = dlm_find_lockspace_local(arg);
David Teigland5f88f1e2006-08-24 14:47:20 -0500257 if (!ls) {
258 log_print("dlm_recoverd: no lockspace %p", arg);
259 return -1;
260 }
David Teiglande7fd4172006-01-18 09:30:29 +0000261
262 while (!kthread_should_stop()) {
263 set_current_state(TASK_INTERRUPTIBLE);
264 if (!test_bit(LSFL_WORK, &ls->ls_flags))
265 schedule();
266 set_current_state(TASK_RUNNING);
267
268 if (test_and_clear_bit(LSFL_WORK, &ls->ls_flags))
269 do_ls_recovery(ls);
270 }
271
272 dlm_put_lockspace(ls);
273 return 0;
274}
275
276void dlm_recoverd_kick(struct dlm_ls *ls)
277{
278 set_bit(LSFL_WORK, &ls->ls_flags);
279 wake_up_process(ls->ls_recoverd_task);
280}
281
282int dlm_recoverd_start(struct dlm_ls *ls)
283{
284 struct task_struct *p;
285 int error = 0;
286
287 p = kthread_run(dlm_recoverd, ls, "dlm_recoverd");
288 if (IS_ERR(p))
289 error = PTR_ERR(p);
290 else
291 ls->ls_recoverd_task = p;
292 return error;
293}
294
295void dlm_recoverd_stop(struct dlm_ls *ls)
296{
297 kthread_stop(ls->ls_recoverd_task);
298}
299
300void dlm_recoverd_suspend(struct dlm_ls *ls)
301{
David Teiglandf6db1b82006-08-08 17:06:07 -0500302 wake_up(&ls->ls_wait_general);
David Teigland90135922006-01-20 08:47:07 +0000303 mutex_lock(&ls->ls_recoverd_active);
David Teiglande7fd4172006-01-18 09:30:29 +0000304}
305
306void dlm_recoverd_resume(struct dlm_ls *ls)
307{
David Teigland90135922006-01-20 08:47:07 +0000308 mutex_unlock(&ls->ls_recoverd_active);
David Teiglande7fd4172006-01-18 09:30:29 +0000309}
310