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7 * it under the terms of the GNU General Public License version 2 only,
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10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
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18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
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21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
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33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/ptlrpc/recover.c
38 * Author: Mike Shaver <shaver@clusterfs.com>
41 #define DEBUG_SUBSYSTEM S_RPC
42 #include "../../include/linux/libcfs/libcfs.h"
44 #include "../include/obd_support.h"
45 #include "../include/lustre_ha.h"
46 #include "../include/lustre_net.h"
47 #include "../include/lustre_import.h"
48 #include "../include/lustre_export.h"
49 #include "../include/obd.h"
50 #include "../include/obd_class.h"
51 #include <linux/list.h>
53 #include "ptlrpc_internal.h"
56 * Start recovery on disconnected import.
57 * This is done by just attempting a connect
59 void ptlrpc_initiate_recovery(struct obd_import
*imp
)
61 CDEBUG(D_HA
, "%s: starting recovery\n", obd2cli_tgt(imp
->imp_obd
));
62 ptlrpc_connect_import(imp
);
66 * Identify what request from replay list needs to be replayed next
67 * (based on what we have already replayed) and send it to server.
69 int ptlrpc_replay_next(struct obd_import
*imp
, int *inflight
)
72 struct list_head
*tmp
, *pos
;
73 struct ptlrpc_request
*req
= NULL
;
78 /* It might have committed some after we last spoke, so make sure we
79 * get rid of them now.
81 spin_lock(&imp
->imp_lock
);
82 imp
->imp_last_transno_checked
= 0;
83 ptlrpc_free_committed(imp
);
84 last_transno
= imp
->imp_last_replay_transno
;
85 spin_unlock(&imp
->imp_lock
);
87 CDEBUG(D_HA
, "import %p from %s committed %llu last %llu\n",
88 imp
, obd2cli_tgt(imp
->imp_obd
),
89 imp
->imp_peer_committed_transno
, last_transno
);
91 /* Do I need to hold a lock across this iteration? We shouldn't be
92 * racing with any additions to the list, because we're in recovery
93 * and are therefore not processing additional requests to add. Calls
94 * to ptlrpc_free_committed might commit requests, but nothing "newer"
95 * than the one we're replaying (it can't be committed until it's
96 * replayed, and we're doing that here). l_f_e_safe protects against
97 * problems with the current request being committed, in the unlikely
98 * event of that race. So, in conclusion, I think that it's safe to
99 * perform this list-walk without the imp_lock held.
101 * But, the {mdc,osc}_replay_open callbacks both iterate
102 * request lists, and have comments saying they assume the
103 * imp_lock is being held by ptlrpc_replay, but it's not. it's
104 * just a little race...
107 /* Replay all the committed open requests on committed_list first */
108 if (!list_empty(&imp
->imp_committed_list
)) {
109 tmp
= imp
->imp_committed_list
.prev
;
110 req
= list_entry(tmp
, struct ptlrpc_request
, rq_replay_list
);
112 /* The last request on committed_list hasn't been replayed */
113 if (req
->rq_transno
> last_transno
) {
114 /* Since the imp_committed_list is immutable before
115 * all of it's requests being replayed, it's safe to
116 * use a cursor to accelerate the search
118 imp
->imp_replay_cursor
= imp
->imp_replay_cursor
->next
;
120 while (imp
->imp_replay_cursor
!=
121 &imp
->imp_committed_list
) {
122 req
= list_entry(imp
->imp_replay_cursor
,
123 struct ptlrpc_request
,
125 if (req
->rq_transno
> last_transno
)
129 imp
->imp_replay_cursor
=
130 imp
->imp_replay_cursor
->next
;
133 /* All requests on committed_list have been replayed */
134 imp
->imp_replay_cursor
= &imp
->imp_committed_list
;
139 /* All the requests in committed list have been replayed, let's replay
140 * the imp_replay_list
143 list_for_each_safe(tmp
, pos
, &imp
->imp_replay_list
) {
144 req
= list_entry(tmp
, struct ptlrpc_request
,
147 if (req
->rq_transno
> last_transno
)
153 /* If need to resend the last sent transno (because a reconnect
154 * has occurred), then stop on the matching req and send it again.
155 * If, however, the last sent transno has been committed then we
156 * continue replay from the next request.
158 if (req
&& imp
->imp_resend_replay
)
159 lustre_msg_add_flags(req
->rq_reqmsg
, MSG_RESENT
);
161 spin_lock(&imp
->imp_lock
);
162 imp
->imp_resend_replay
= 0;
163 spin_unlock(&imp
->imp_lock
);
166 rc
= ptlrpc_replay_req(req
);
168 CERROR("recovery replay error %d for req %llu\n",
178 * Schedule resending of request on sending_list. This is done after
179 * we completed replaying of requests and locks.
181 int ptlrpc_resend(struct obd_import
*imp
)
183 struct ptlrpc_request
*req
, *next
;
185 /* As long as we're in recovery, nothing should be added to the sending
186 * list, so we don't need to hold the lock during this iteration and
189 /* Well... what if lctl recover is called twice at the same time?
191 spin_lock(&imp
->imp_lock
);
192 if (imp
->imp_state
!= LUSTRE_IMP_RECOVER
) {
193 spin_unlock(&imp
->imp_lock
);
197 list_for_each_entry_safe(req
, next
, &imp
->imp_sending_list
, rq_list
) {
198 LASSERTF((long)req
> PAGE_SIZE
&& req
!= LP_POISON
,
199 "req %p bad\n", req
);
200 LASSERTF(req
->rq_type
!= LI_POISON
, "req %p freed\n", req
);
201 if (!ptlrpc_no_resend(req
))
202 ptlrpc_resend_req(req
);
204 spin_unlock(&imp
->imp_lock
);
208 EXPORT_SYMBOL(ptlrpc_resend
);
211 * Go through all requests in delayed list and wake their threads
214 void ptlrpc_wake_delayed(struct obd_import
*imp
)
216 struct list_head
*tmp
, *pos
;
217 struct ptlrpc_request
*req
;
219 spin_lock(&imp
->imp_lock
);
220 list_for_each_safe(tmp
, pos
, &imp
->imp_delayed_list
) {
221 req
= list_entry(tmp
, struct ptlrpc_request
, rq_list
);
223 DEBUG_REQ(D_HA
, req
, "waking (set %p):", req
->rq_set
);
224 ptlrpc_client_wake_req(req
);
226 spin_unlock(&imp
->imp_lock
);
228 EXPORT_SYMBOL(ptlrpc_wake_delayed
);
230 void ptlrpc_request_handle_notconn(struct ptlrpc_request
*failed_req
)
232 struct obd_import
*imp
= failed_req
->rq_import
;
234 CDEBUG(D_HA
, "import %s of %s@%s abruptly disconnected: reconnecting\n",
235 imp
->imp_obd
->obd_name
, obd2cli_tgt(imp
->imp_obd
),
236 imp
->imp_connection
->c_remote_uuid
.uuid
);
238 if (ptlrpc_set_import_discon(imp
,
239 lustre_msg_get_conn_cnt(failed_req
->rq_reqmsg
))) {
240 if (!imp
->imp_replayable
) {
241 CDEBUG(D_HA
, "import %s@%s for %s not replayable, auto-deactivating\n",
242 obd2cli_tgt(imp
->imp_obd
),
243 imp
->imp_connection
->c_remote_uuid
.uuid
,
244 imp
->imp_obd
->obd_name
);
245 ptlrpc_deactivate_import(imp
);
247 /* to control recovery via lctl {disable|enable}_recovery */
248 if (imp
->imp_deactive
== 0)
249 ptlrpc_connect_import(imp
);
252 /* Wait for recovery to complete and resend. If evicted, then
253 * this request will be errored out later.
255 spin_lock(&failed_req
->rq_lock
);
256 if (!failed_req
->rq_no_resend
)
257 failed_req
->rq_resend
= 1;
258 spin_unlock(&failed_req
->rq_lock
);
262 * Administratively active/deactive a client.
263 * This should only be called by the ioctl interface, currently
264 * - the lctl deactivate and activate commands
265 * - echo 0/1 >> /sys/fs/lustre/osc/XXX/active
266 * - client umount -f (ll_umount_begin)
268 int ptlrpc_set_import_active(struct obd_import
*imp
, int active
)
270 struct obd_device
*obd
= imp
->imp_obd
;
275 /* When deactivating, mark import invalid, and abort in-flight
279 LCONSOLE_WARN("setting import %s INACTIVE by administrator request\n",
280 obd2cli_tgt(imp
->imp_obd
));
282 /* set before invalidate to avoid messages about imp_inval
283 * set without imp_deactive in ptlrpc_import_delay_req
285 spin_lock(&imp
->imp_lock
);
286 imp
->imp_deactive
= 1;
287 spin_unlock(&imp
->imp_lock
);
289 obd_import_event(imp
->imp_obd
, imp
, IMP_EVENT_DEACTIVATE
);
291 ptlrpc_invalidate_import(imp
);
294 /* When activating, mark import valid, and attempt recovery */
296 CDEBUG(D_HA
, "setting import %s VALID\n",
297 obd2cli_tgt(imp
->imp_obd
));
299 spin_lock(&imp
->imp_lock
);
300 imp
->imp_deactive
= 0;
301 spin_unlock(&imp
->imp_lock
);
302 obd_import_event(imp
->imp_obd
, imp
, IMP_EVENT_ACTIVATE
);
304 rc
= ptlrpc_recover_import(imp
, NULL
, 0);
309 EXPORT_SYMBOL(ptlrpc_set_import_active
);
311 /* Attempt to reconnect an import */
312 int ptlrpc_recover_import(struct obd_import
*imp
, char *new_uuid
, int async
)
316 spin_lock(&imp
->imp_lock
);
317 if (imp
->imp_state
== LUSTRE_IMP_NEW
|| imp
->imp_deactive
||
318 atomic_read(&imp
->imp_inval_count
))
320 spin_unlock(&imp
->imp_lock
);
324 /* force import to be disconnected. */
325 ptlrpc_set_import_discon(imp
, 0);
328 struct obd_uuid uuid
;
330 /* intruct import to use new uuid */
331 obd_str2uuid(&uuid
, new_uuid
);
332 rc
= import_set_conn_priority(imp
, &uuid
);
337 /* Check if reconnect is already in progress */
338 spin_lock(&imp
->imp_lock
);
339 if (imp
->imp_state
!= LUSTRE_IMP_DISCON
) {
340 imp
->imp_force_verify
= 1;
343 spin_unlock(&imp
->imp_lock
);
347 rc
= ptlrpc_connect_import(imp
);
352 struct l_wait_info lwi
;
353 int secs
= cfs_time_seconds(obd_timeout
);
355 CDEBUG(D_HA
, "%s: recovery started, waiting %u seconds\n",
356 obd2cli_tgt(imp
->imp_obd
), secs
);
358 lwi
= LWI_TIMEOUT(secs
, NULL
, NULL
);
359 rc
= l_wait_event(imp
->imp_recovery_waitq
,
360 !ptlrpc_import_in_recovery(imp
), &lwi
);
361 CDEBUG(D_HA
, "%s: recovery finished\n",
362 obd2cli_tgt(imp
->imp_obd
));
368 EXPORT_SYMBOL(ptlrpc_recover_import
);
370 int ptlrpc_import_in_recovery(struct obd_import
*imp
)
374 spin_lock(&imp
->imp_lock
);
375 if (imp
->imp_state
== LUSTRE_IMP_FULL
||
376 imp
->imp_state
== LUSTRE_IMP_CLOSED
||
377 imp
->imp_state
== LUSTRE_IMP_DISCON
||
378 imp
->imp_obd
->obd_no_recov
)
380 spin_unlock(&imp
->imp_lock
);