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LU-6496 ptlrpc: Fix wrong code indentation in plain_authorize
[fs/lustre-release.git] / lustre / ptlrpc / recover.c
1 /*
2  * GPL HEADER START
3  *
4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 only,
8  * as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful, but
11  * WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13  * General Public License version 2 for more details (a copy is included
14  * in the LICENSE file that accompanied this code).
15  *
16  * You should have received a copy of the GNU General Public License
17  * version 2 along with this program; If not, see
18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
19  *
20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21  * CA 95054 USA or visit www.sun.com if you need additional information or
22  * have any questions.
23  *
24  * GPL HEADER END
25  */
26 /*
27  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
28  * Use is subject to license terms.
29  *
30  * Copyright (c) 2011, 2014, Intel Corporation.
31  */
32 /*
33  * This file is part of Lustre, http://www.lustre.org/
34  * Lustre is a trademark of Sun Microsystems, Inc.
35  *
36  * lustre/ptlrpc/recover.c
37  *
38  * Author: Mike Shaver <shaver@clusterfs.com>
39  */
40
41 #define DEBUG_SUBSYSTEM S_RPC
42 #include <libcfs/libcfs.h>
43 #include <obd_support.h>
44 #include <lustre_ha.h>
45 #include <lustre_net.h>
46 #include <lustre_import.h>
47 #include <lustre_export.h>
48 #include <obd.h>
49 #include <obd_class.h>
50 #include <libcfs/list.h>
51
52 #include "ptlrpc_internal.h"
53
54 /**
55  * Start recovery on disconnected import.
56  * This is done by just attempting a connect
57  */
58 void ptlrpc_initiate_recovery(struct obd_import *imp)
59 {
60         ENTRY;
61
62         CDEBUG(D_HA, "%s: starting recovery\n", obd2cli_tgt(imp->imp_obd));
63         ptlrpc_connect_import(imp);
64
65         EXIT;
66 }
67
68 /**
69  * Identify what request from replay list needs to be replayed next
70  * (based on what we have already replayed) and send it to server.
71  */
72 int ptlrpc_replay_next(struct obd_import *imp, int *inflight)
73 {
74         int rc = 0;
75         struct list_head *tmp, *pos;
76         struct ptlrpc_request *req = NULL;
77         __u64 last_transno;
78         ENTRY;
79
80         *inflight = 0;
81
82         /* It might have committed some after we last spoke, so make sure we
83          * get rid of them now.
84          */
85         spin_lock(&imp->imp_lock);
86         imp->imp_last_transno_checked = 0;
87         ptlrpc_free_committed(imp);
88         last_transno = imp->imp_last_replay_transno;
89         spin_unlock(&imp->imp_lock);
90
91         CDEBUG(D_HA, "import %p from %s committed "LPU64" last "LPU64"\n",
92                imp, obd2cli_tgt(imp->imp_obd),
93                imp->imp_peer_committed_transno, last_transno);
94
95         /* Do I need to hold a lock across this iteration?  We shouldn't be
96          * racing with any additions to the list, because we're in recovery
97          * and are therefore not processing additional requests to add.  Calls
98          * to ptlrpc_free_committed might commit requests, but nothing "newer"
99          * than the one we're replaying (it can't be committed until it's
100          * replayed, and we're doing that here).  l_f_e_safe protects against
101          * problems with the current request being committed, in the unlikely
102          * event of that race.  So, in conclusion, I think that it's safe to
103          * perform this list-walk without the imp_lock held.
104          *
105          * But, the {mdc,osc}_replay_open callbacks both iterate
106          * request lists, and have comments saying they assume the
107          * imp_lock is being held by ptlrpc_replay, but it's not. it's
108          * just a little race...
109          */
110
111         /* Replay all the committed open requests on committed_list first */
112         if (!list_empty(&imp->imp_committed_list)) {
113                 tmp = imp->imp_committed_list.prev;
114                 req = list_entry(tmp, struct ptlrpc_request,
115                                      rq_replay_list);
116
117                 /* The last request on committed_list hasn't been replayed */
118                 if (req->rq_transno > last_transno) {
119                         /* Since the imp_committed_list is immutable before
120                          * all of it's requests being replayed, it's safe to
121                          * use a cursor to accelerate the search */
122                         imp->imp_replay_cursor = imp->imp_replay_cursor->next;
123
124                         while (imp->imp_replay_cursor !=
125                                &imp->imp_committed_list) {
126                                 req = list_entry(imp->imp_replay_cursor,
127                                                      struct ptlrpc_request,
128                                                      rq_replay_list);
129                                 if (req->rq_transno > last_transno)
130                                         break;
131
132                                 req = NULL;
133                                 imp->imp_replay_cursor =
134                                         imp->imp_replay_cursor->next;
135                         }
136                 } else {
137                         /* All requests on committed_list have been replayed */
138                         imp->imp_replay_cursor = &imp->imp_committed_list;
139                         req = NULL;
140                 }
141         }
142
143         /* All the requests in committed list have been replayed, let's replay
144          * the imp_replay_list */
145         if (req == NULL) {
146                 list_for_each_safe(tmp, pos, &imp->imp_replay_list) {
147                         req = list_entry(tmp, struct ptlrpc_request,
148                                              rq_replay_list);
149
150                         if (req->rq_transno > last_transno)
151                                 break;
152                         req = NULL;
153                 }
154         }
155
156         /* If need to resend the last sent transno (because a reconnect
157          * has occurred), then stop on the matching req and send it again.
158          * If, however, the last sent transno has been committed then we 
159          * continue replay from the next request. */
160         if (req != NULL && imp->imp_resend_replay)
161                 lustre_msg_add_flags(req->rq_reqmsg, MSG_RESENT);
162
163         spin_lock(&imp->imp_lock);
164         imp->imp_resend_replay = 0;
165         spin_unlock(&imp->imp_lock);
166
167         if (req != NULL) {
168                 rc = ptlrpc_replay_req(req);
169                 if (rc) {
170                         CERROR("recovery replay error %d for req "
171                                LPU64"\n", rc, req->rq_xid);
172                         RETURN(rc);
173                 }
174                 *inflight = 1;
175         }
176         RETURN(rc);
177 }
178
179 /**
180  * Schedule resending of request on sending_list. This is done after
181  * we completed replaying of requests and locks.
182  */
183 int ptlrpc_resend(struct obd_import *imp)
184 {
185         struct ptlrpc_request *req, *next;
186
187         ENTRY;
188
189         /* As long as we're in recovery, nothing should be added to the sending
190          * list, so we don't need to hold the lock during this iteration and
191          * resend process.
192          */
193         /* Well... what if lctl recover is called twice at the same time?
194          */
195         spin_lock(&imp->imp_lock);
196         if (imp->imp_state != LUSTRE_IMP_RECOVER) {
197                 spin_unlock(&imp->imp_lock);
198                 RETURN(-1);
199         }
200
201         list_for_each_entry_safe(req, next, &imp->imp_sending_list,
202                                      rq_list) {
203                 LASSERTF((long)req > PAGE_CACHE_SIZE && req != LP_POISON,
204                          "req %p bad\n", req);
205                 LASSERTF(req->rq_type != LI_POISON, "req %p freed\n", req);
206                 if (!ptlrpc_no_resend(req))
207                         ptlrpc_resend_req(req);
208         }
209         spin_unlock(&imp->imp_lock);
210
211         RETURN(0);
212 }
213
214 /**
215  * Go through all requests in delayed list and wake their threads
216  * for resending
217  */
218 void ptlrpc_wake_delayed(struct obd_import *imp)
219 {
220         struct list_head *tmp, *pos;
221         struct ptlrpc_request *req;
222
223         spin_lock(&imp->imp_lock);
224         list_for_each_safe(tmp, pos, &imp->imp_delayed_list) {
225                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
226
227                 DEBUG_REQ(D_HA, req, "waking (set %p):", req->rq_set);
228                 ptlrpc_client_wake_req(req);
229         }
230         spin_unlock(&imp->imp_lock);
231 }
232
233 void ptlrpc_request_handle_notconn(struct ptlrpc_request *failed_req)
234 {
235         struct obd_import *imp = failed_req->rq_import;
236         ENTRY;
237
238         CDEBUG(D_HA, "import %s of %s@%s abruptly disconnected: reconnecting\n",
239                imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd),
240                imp->imp_connection->c_remote_uuid.uuid);
241
242         if (ptlrpc_set_import_discon(imp,
243                               lustre_msg_get_conn_cnt(failed_req->rq_reqmsg))) {
244                 if (!imp->imp_replayable) {
245                         CDEBUG(D_HA, "import %s@%s for %s not replayable, "
246                                "auto-deactivating\n",
247                                obd2cli_tgt(imp->imp_obd),
248                                imp->imp_connection->c_remote_uuid.uuid,
249                                imp->imp_obd->obd_name);
250                         ptlrpc_deactivate_import(imp);
251                 }
252                 /* to control recovery via lctl {disable|enable}_recovery */
253                 if (imp->imp_deactive == 0)
254                         ptlrpc_connect_import(imp);
255         }
256
257         /* Wait for recovery to complete and resend. If evicted, then
258            this request will be errored out later.*/
259         spin_lock(&failed_req->rq_lock);
260         if (!failed_req->rq_no_resend)
261                 failed_req->rq_resend = 1;
262         spin_unlock(&failed_req->rq_lock);
263
264         EXIT;
265 }
266
267 /**
268  * Administratively active/deactive a client. 
269  * This should only be called by the ioctl interface, currently
270  *  - the lctl deactivate and activate commands
271  *  - echo 0/1 >> /proc/osc/XXX/active
272  *  - client umount -f (ll_umount_begin)
273  */
274 int ptlrpc_set_import_active(struct obd_import *imp, int active)
275 {
276         struct obd_device *obd = imp->imp_obd;
277         int rc = 0;
278
279         ENTRY;
280         LASSERT(obd);
281
282         /* When deactivating, mark import invalid, and abort in-flight
283          * requests. */
284         if (!active) {
285                 LCONSOLE_WARN("setting import %s INACTIVE by administrator "
286                               "request\n", obd2cli_tgt(imp->imp_obd));
287
288                 /* set before invalidate to avoid messages about imp_inval
289                  * set without imp_deactive in ptlrpc_import_delay_req */
290                 spin_lock(&imp->imp_lock);
291                 imp->imp_deactive = 1;
292                 spin_unlock(&imp->imp_lock);
293
294                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_DEACTIVATE);
295
296                 ptlrpc_invalidate_import(imp);
297         }
298
299         /* When activating, mark import valid, and attempt recovery */
300         if (active) {
301                 CDEBUG(D_HA, "setting import %s VALID\n",
302                        obd2cli_tgt(imp->imp_obd));
303
304                 spin_lock(&imp->imp_lock);
305                 imp->imp_deactive = 0;
306                 spin_unlock(&imp->imp_lock);
307                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_ACTIVATE);
308
309                 rc = ptlrpc_recover_import(imp, NULL, 0);
310         }
311
312         RETURN(rc);
313 }
314 EXPORT_SYMBOL(ptlrpc_set_import_active);
315
316 /* Attempt to reconnect an import */
317 int ptlrpc_recover_import(struct obd_import *imp, char *new_uuid, int async)
318 {
319         int rc = 0;
320         ENTRY;
321
322         spin_lock(&imp->imp_lock);
323         if (imp->imp_state == LUSTRE_IMP_NEW || imp->imp_deactive ||
324             atomic_read(&imp->imp_inval_count))
325                 rc = -EINVAL;
326         spin_unlock(&imp->imp_lock);
327         if (rc)
328                 GOTO(out, rc);
329
330         /* force import to be disconnected. */
331         ptlrpc_set_import_discon(imp, 0);
332
333         if (new_uuid) {
334                 struct obd_uuid uuid;
335
336                 /* intruct import to use new uuid */
337                 obd_str2uuid(&uuid, new_uuid);
338                 rc = import_set_conn_priority(imp, &uuid);
339                 if (rc)
340                         GOTO(out, rc);
341         }
342
343         /* Check if reconnect is already in progress */
344         spin_lock(&imp->imp_lock);
345         if (imp->imp_state != LUSTRE_IMP_DISCON) {
346                 imp->imp_force_verify = 1;
347                 rc = -EALREADY;
348         }
349         spin_unlock(&imp->imp_lock);
350         if (rc)
351                 GOTO(out, rc);
352
353         rc = ptlrpc_connect_import(imp);
354         if (rc)
355                 GOTO(out, rc);
356
357         if (!async) {
358                 struct l_wait_info lwi;
359                 int secs = cfs_time_seconds(obd_timeout);
360
361                 CDEBUG(D_HA, "%s: recovery started, waiting %u seconds\n",
362                        obd2cli_tgt(imp->imp_obd), secs);
363
364                 lwi = LWI_TIMEOUT(secs, NULL, NULL);
365                 rc = l_wait_event(imp->imp_recovery_waitq,
366                                   !ptlrpc_import_in_recovery(imp), &lwi);
367                 CDEBUG(D_HA, "%s: recovery finished\n",
368                        obd2cli_tgt(imp->imp_obd));
369         }
370         EXIT;
371
372 out:
373         return rc;
374 }
375 EXPORT_SYMBOL(ptlrpc_recover_import);
376
377 int ptlrpc_import_in_recovery(struct obd_import *imp)
378 {
379         int in_recovery = 1;
380
381         spin_lock(&imp->imp_lock);
382         if (imp->imp_state == LUSTRE_IMP_FULL ||
383             imp->imp_state == LUSTRE_IMP_CLOSED ||
384             imp->imp_state == LUSTRE_IMP_DISCON ||
385             imp->imp_obd->obd_no_recov)
386                 in_recovery = 0;
387         spin_unlock(&imp->imp_lock);
388
389         return in_recovery;
390 }