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[/] [test_project/] [trunk/] [linux_sd_driver/] [fs/] [dlm/] [recoverd.c] - Blame information for rev 62

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Line No. Rev Author Line
1 62 marcus.erl
/******************************************************************************
2
*******************************************************************************
3
**
4
**  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
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**  Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
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**
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**  This copyrighted material is made available to anyone wishing to use,
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**  modify, copy, or redistribute it subject to the terms and conditions
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**  of the GNU General Public License v.2.
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**
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*******************************************************************************
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******************************************************************************/
13
 
14
#include "dlm_internal.h"
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#include "lockspace.h"
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#include "member.h"
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#include "dir.h"
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#include "ast.h"
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#include "recover.h"
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#include "lowcomms.h"
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#include "lock.h"
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#include "requestqueue.h"
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#include "recoverd.h"
24
 
25
 
26
/* If the start for which we're re-enabling locking (seq) has been superseded
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   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
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   locking stopped and b) adds a message to the requestqueue, but dlm_recoverd
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   enables locking and clears the requestqueue between a and b. */
32
 
33
static int enable_locking(struct dlm_ls *ls, uint64_t seq)
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{
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        int error = -EINTR;
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37
        down_write(&ls->ls_recv_active);
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39
        spin_lock(&ls->ls_recover_lock);
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        if (ls->ls_recover_seq == seq) {
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                set_bit(LSFL_RUNNING, &ls->ls_flags);
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                /* unblocks processes waiting to enter the dlm */
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                up_write(&ls->ls_in_recovery);
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                error = 0;
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        }
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        spin_unlock(&ls->ls_recover_lock);
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48
        up_write(&ls->ls_recv_active);
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        return error;
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}
51
 
52
static int ls_recover(struct dlm_ls *ls, struct dlm_recover *rv)
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{
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        unsigned long start;
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        int error, neg = 0;
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57
        log_debug(ls, "recover %llx", (unsigned long long)rv->seq);
58
 
59
        mutex_lock(&ls->ls_recoverd_active);
60
 
61
        /*
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         * Suspending and resuming dlm_astd ensures that no lkb's from this ls
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         * will be processed by dlm_astd during recovery.
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         */
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66
        dlm_astd_suspend();
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        dlm_astd_resume();
68
 
69
        /*
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         * This list of root rsb's will be the basis of most of the recovery
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         * routines.
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         */
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74
        dlm_create_root_list(ls);
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        /*
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         * Free all the tossed rsb's so we don't have to recover them.
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         */
79
 
80
        dlm_clear_toss_list(ls);
81
 
82
        /*
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         * Add or remove nodes from the lockspace's ls_nodes list.
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         * Also waits for all nodes to complete dlm_recover_members.
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         */
86
 
87
        error = dlm_recover_members(ls, rv, &neg);
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        if (error) {
89
                log_debug(ls, "recover_members failed %d", error);
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                goto fail;
91
        }
92
        start = jiffies;
93
 
94
        /*
95
         * Rebuild our own share of the directory by collecting from all other
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         * nodes their master rsb names that hash to us.
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         */
98
 
99
        error = dlm_recover_directory(ls);
100
        if (error) {
101
                log_debug(ls, "recover_directory failed %d", error);
102
                goto fail;
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        }
104
 
105
        /*
106
         * Wait for all nodes to complete directory rebuild.
107
         */
108
 
109
        error = dlm_recover_directory_wait(ls);
110
        if (error) {
111
                log_debug(ls, "recover_directory_wait failed %d", error);
112
                goto fail;
113
        }
114
 
115
        /*
116
         * We may have outstanding operations that are waiting for a reply from
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         * a failed node.  Mark these to be resent after recovery.  Unlock and
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         * cancel ops can just be completed.
119
         */
120
 
121
        dlm_recover_waiters_pre(ls);
122
 
123
        error = dlm_recovery_stopped(ls);
124
        if (error)
125
                goto fail;
126
 
127
        if (neg || dlm_no_directory(ls)) {
128
                /*
129
                 * Clear lkb's for departed nodes.
130
                 */
131
 
132
                dlm_purge_locks(ls);
133
 
134
                /*
135
                 * Get new master nodeid's for rsb's that were mastered on
136
                 * departed nodes.
137
                 */
138
 
139
                error = dlm_recover_masters(ls);
140
                if (error) {
141
                        log_debug(ls, "recover_masters failed %d", error);
142
                        goto fail;
143
                }
144
 
145
                /*
146
                 * Send our locks on remastered rsb's to the new masters.
147
                 */
148
 
149
                error = dlm_recover_locks(ls);
150
                if (error) {
151
                        log_debug(ls, "recover_locks failed %d", error);
152
                        goto fail;
153
                }
154
 
155
                error = dlm_recover_locks_wait(ls);
156
                if (error) {
157
                        log_debug(ls, "recover_locks_wait failed %d", error);
158
                        goto fail;
159
                }
160
 
161
                /*
162
                 * Finalize state in master rsb's now that all locks can be
163
                 * checked.  This includes conversion resolution and lvb
164
                 * settings.
165
                 */
166
 
167
                dlm_recover_rsbs(ls);
168
        } else {
169
                /*
170
                 * Other lockspace members may be going through the "neg" steps
171
                 * while also adding us to the lockspace, in which case they'll
172
                 * be doing the recover_locks (RS_LOCKS) barrier.
173
                 */
174
                dlm_set_recover_status(ls, DLM_RS_LOCKS);
175
 
176
                error = dlm_recover_locks_wait(ls);
177
                if (error) {
178
                        log_debug(ls, "recover_locks_wait failed %d", error);
179
                        goto fail;
180
                }
181
        }
182
 
183
        dlm_release_root_list(ls);
184
 
185
        /*
186
         * Purge directory-related requests that are saved in requestqueue.
187
         * All dir requests from before recovery are invalid now due to the dir
188
         * rebuild and will be resent by the requesting nodes.
189
         */
190
 
191
        dlm_purge_requestqueue(ls);
192
 
193
        dlm_set_recover_status(ls, DLM_RS_DONE);
194
        error = dlm_recover_done_wait(ls);
195
        if (error) {
196
                log_debug(ls, "recover_done_wait failed %d", error);
197
                goto fail;
198
        }
199
 
200
        dlm_clear_members_gone(ls);
201
 
202
        dlm_adjust_timeouts(ls);
203
 
204
        error = enable_locking(ls, rv->seq);
205
        if (error) {
206
                log_debug(ls, "enable_locking failed %d", error);
207
                goto fail;
208
        }
209
 
210
        error = dlm_process_requestqueue(ls);
211
        if (error) {
212
                log_debug(ls, "process_requestqueue failed %d", error);
213
                goto fail;
214
        }
215
 
216
        error = dlm_recover_waiters_post(ls);
217
        if (error) {
218
                log_debug(ls, "recover_waiters_post failed %d", error);
219
                goto fail;
220
        }
221
 
222
        dlm_grant_after_purge(ls);
223
 
224
        dlm_astd_wake();
225
 
226
        log_debug(ls, "recover %llx done: %u ms",
227
                  (unsigned long long)rv->seq,
228
                  jiffies_to_msecs(jiffies - start));
229
        mutex_unlock(&ls->ls_recoverd_active);
230
 
231
        return 0;
232
 
233
 fail:
234
        dlm_release_root_list(ls);
235
        log_debug(ls, "recover %llx error %d",
236
                  (unsigned long long)rv->seq, error);
237
        mutex_unlock(&ls->ls_recoverd_active);
238
        return error;
239
}
240
 
241
/* The dlm_ls_start() that created the rv we take here may already have been
242
   stopped via dlm_ls_stop(); in that case we need to leave the RECOVERY_STOP
243
   flag set. */
244
 
245
static void do_ls_recovery(struct dlm_ls *ls)
246
{
247
        struct dlm_recover *rv = NULL;
248
 
249
        spin_lock(&ls->ls_recover_lock);
250
        rv = ls->ls_recover_args;
251
        ls->ls_recover_args = NULL;
252
        if (rv && ls->ls_recover_seq == rv->seq)
253
                clear_bit(LSFL_RECOVERY_STOP, &ls->ls_flags);
254
        spin_unlock(&ls->ls_recover_lock);
255
 
256
        if (rv) {
257
                ls_recover(ls, rv);
258
                kfree(rv->nodeids);
259
                kfree(rv);
260
        }
261
}
262
 
263
static int dlm_recoverd(void *arg)
264
{
265
        struct dlm_ls *ls;
266
 
267
        ls = dlm_find_lockspace_local(arg);
268
        if (!ls) {
269
                log_print("dlm_recoverd: no lockspace %p", arg);
270
                return -1;
271
        }
272
 
273
        while (!kthread_should_stop()) {
274
                set_current_state(TASK_INTERRUPTIBLE);
275
                if (!test_bit(LSFL_WORK, &ls->ls_flags))
276
                        schedule();
277
                set_current_state(TASK_RUNNING);
278
 
279
                if (test_and_clear_bit(LSFL_WORK, &ls->ls_flags))
280
                        do_ls_recovery(ls);
281
        }
282
 
283
        dlm_put_lockspace(ls);
284
        return 0;
285
}
286
 
287
void dlm_recoverd_kick(struct dlm_ls *ls)
288
{
289
        set_bit(LSFL_WORK, &ls->ls_flags);
290
        wake_up_process(ls->ls_recoverd_task);
291
}
292
 
293
int dlm_recoverd_start(struct dlm_ls *ls)
294
{
295
        struct task_struct *p;
296
        int error = 0;
297
 
298
        p = kthread_run(dlm_recoverd, ls, "dlm_recoverd");
299
        if (IS_ERR(p))
300
                error = PTR_ERR(p);
301
        else
302
                ls->ls_recoverd_task = p;
303
        return error;
304
}
305
 
306
void dlm_recoverd_stop(struct dlm_ls *ls)
307
{
308
        kthread_stop(ls->ls_recoverd_task);
309
}
310
 
311
void dlm_recoverd_suspend(struct dlm_ls *ls)
312
{
313
        wake_up(&ls->ls_wait_general);
314
        mutex_lock(&ls->ls_recoverd_active);
315
}
316
 
317
void dlm_recoverd_resume(struct dlm_ls *ls)
318
{
319
        mutex_unlock(&ls->ls_recoverd_active);
320
}
321
 

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