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36 * lustre/ptlrpc/recover.c
38 * Author: Mike Shaver <shaver@clusterfs.com>
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>
49 #include <obd_class.h>
50 #include <libcfs/list.h>
52 #include "ptlrpc_internal.h"
55 * Start recovery on disconnected import.
56 * This is done by just attempting a connect
58 void ptlrpc_initiate_recovery(struct obd_import *imp)
62 CDEBUG(D_HA, "%s: starting recovery\n", obd2cli_tgt(imp->imp_obd));
63 ptlrpc_connect_import(imp);
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.
72 int ptlrpc_replay_next(struct obd_import *imp, int *inflight)
75 struct list_head *tmp, *pos;
76 struct ptlrpc_request *req = NULL;
82 /* It might have committed some after we last spoke, so make sure we
83 * get rid of them now.
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);
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);
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.
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...
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,
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 if (!imp->imp_resend_replay ||
123 imp->imp_replay_cursor == &imp->imp_committed_list)
124 imp->imp_replay_cursor =
125 imp->imp_replay_cursor->next;
127 while (imp->imp_replay_cursor !=
128 &imp->imp_committed_list) {
129 req = list_entry(imp->imp_replay_cursor,
130 struct ptlrpc_request,
132 if (req->rq_transno > last_transno)
136 imp->imp_replay_cursor =
137 imp->imp_replay_cursor->next;
140 /* All requests on committed_list have been replayed */
141 imp->imp_replay_cursor = &imp->imp_committed_list;
146 /* All the requests in committed list have been replayed, let's replay
147 * the imp_replay_list */
149 list_for_each_safe(tmp, pos, &imp->imp_replay_list) {
150 req = list_entry(tmp, struct ptlrpc_request,
153 if (req->rq_transno > last_transno)
159 /* If need to resend the last sent transno (because a reconnect
160 * has occurred), then stop on the matching req and send it again.
161 * If, however, the last sent transno has been committed then we
162 * continue replay from the next request. */
163 if (req != NULL && imp->imp_resend_replay)
164 lustre_msg_add_flags(req->rq_reqmsg, MSG_RESENT);
166 spin_lock(&imp->imp_lock);
167 /* The resend replay request may have been removed from the
169 if (req != NULL && imp->imp_resend_replay &&
170 list_empty(&req->rq_unreplied_list))
171 ptlrpc_add_unreplied(req);
173 imp->imp_resend_replay = 0;
174 spin_unlock(&imp->imp_lock);
177 /* The request should have been added back in unreplied list
178 * by ptlrpc_prepare_replay(). */
179 LASSERT(!list_empty(&req->rq_unreplied_list));
181 rc = ptlrpc_replay_req(req);
183 CERROR("recovery replay error %d for req "
184 LPU64"\n", rc, req->rq_xid);
193 * Schedule resending of request on sending_list. This is done after
194 * we completed replaying of requests and locks.
196 int ptlrpc_resend(struct obd_import *imp)
198 struct ptlrpc_request *req, *next;
202 /* As long as we're in recovery, nothing should be added to the sending
203 * list, so we don't need to hold the lock during this iteration and
206 /* Well... what if lctl recover is called twice at the same time?
208 spin_lock(&imp->imp_lock);
209 if (imp->imp_state != LUSTRE_IMP_RECOVER) {
210 spin_unlock(&imp->imp_lock);
214 list_for_each_entry_safe(req, next, &imp->imp_sending_list, rq_list) {
215 LASSERTF((long)req > PAGE_CACHE_SIZE && req != LP_POISON,
216 "req %p bad\n", req);
217 LASSERTF(req->rq_type != LI_POISON, "req %p freed\n", req);
219 /* If the request is allowed to be sent during replay and it
220 * is not timeout yet, then it does not need to be resent. */
221 if (!ptlrpc_no_resend(req) &&
222 (req->rq_timedout || !req->rq_allow_replay))
223 ptlrpc_resend_req(req);
225 spin_unlock(&imp->imp_lock);
231 * Go through all requests in delayed list and wake their threads
234 void ptlrpc_wake_delayed(struct obd_import *imp)
236 struct list_head *tmp, *pos;
237 struct ptlrpc_request *req;
239 spin_lock(&imp->imp_lock);
240 list_for_each_safe(tmp, pos, &imp->imp_delayed_list) {
241 req = list_entry(tmp, struct ptlrpc_request, rq_list);
243 DEBUG_REQ(D_HA, req, "waking (set %p):", req->rq_set);
244 ptlrpc_client_wake_req(req);
246 spin_unlock(&imp->imp_lock);
249 void ptlrpc_request_handle_notconn(struct ptlrpc_request *failed_req)
251 struct obd_import *imp = failed_req->rq_import;
254 CDEBUG(D_HA, "import %s of %s@%s abruptly disconnected: reconnecting\n",
255 imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd),
256 imp->imp_connection->c_remote_uuid.uuid);
258 if (ptlrpc_set_import_discon(imp,
259 lustre_msg_get_conn_cnt(failed_req->rq_reqmsg))) {
260 if (!imp->imp_replayable) {
261 CDEBUG(D_HA, "import %s@%s for %s not replayable, "
262 "auto-deactivating\n",
263 obd2cli_tgt(imp->imp_obd),
264 imp->imp_connection->c_remote_uuid.uuid,
265 imp->imp_obd->obd_name);
266 ptlrpc_deactivate_import(imp);
268 /* to control recovery via lctl {disable|enable}_recovery */
269 if (imp->imp_deactive == 0)
270 ptlrpc_connect_import(imp);
273 /* Wait for recovery to complete and resend. If evicted, then
274 this request will be errored out later.*/
275 spin_lock(&failed_req->rq_lock);
276 if (!failed_req->rq_no_resend)
277 failed_req->rq_resend = 1;
278 spin_unlock(&failed_req->rq_lock);
284 * Administratively active/deactive a client.
285 * This should only be called by the ioctl interface, currently
286 * - the lctl deactivate and activate commands
287 * - echo 0/1 >> /proc/osc/XXX/active
288 * - client umount -f (ll_umount_begin)
290 int ptlrpc_set_import_active(struct obd_import *imp, int active)
292 struct obd_device *obd = imp->imp_obd;
298 /* When deactivating, mark import invalid, and abort in-flight
301 LCONSOLE_WARN("setting import %s INACTIVE by administrator "
302 "request\n", obd2cli_tgt(imp->imp_obd));
304 /* set before invalidate to avoid messages about imp_inval
305 * set without imp_deactive in ptlrpc_import_delay_req */
306 spin_lock(&imp->imp_lock);
307 imp->imp_deactive = 1;
308 spin_unlock(&imp->imp_lock);
310 obd_import_event(imp->imp_obd, imp, IMP_EVENT_DEACTIVATE);
312 ptlrpc_invalidate_import(imp);
315 /* When activating, mark import valid, and attempt recovery */
317 CDEBUG(D_HA, "setting import %s VALID\n",
318 obd2cli_tgt(imp->imp_obd));
320 spin_lock(&imp->imp_lock);
321 imp->imp_deactive = 0;
322 spin_unlock(&imp->imp_lock);
323 obd_import_event(imp->imp_obd, imp, IMP_EVENT_ACTIVATE);
325 rc = ptlrpc_recover_import(imp, NULL, 0);
330 EXPORT_SYMBOL(ptlrpc_set_import_active);
332 /* Attempt to reconnect an import */
333 int ptlrpc_recover_import(struct obd_import *imp, char *new_uuid, int async)
338 spin_lock(&imp->imp_lock);
339 if (imp->imp_state == LUSTRE_IMP_NEW || imp->imp_deactive ||
340 atomic_read(&imp->imp_inval_count))
342 spin_unlock(&imp->imp_lock);
346 /* force import to be disconnected. */
347 ptlrpc_set_import_discon(imp, 0);
350 struct obd_uuid uuid;
352 /* intruct import to use new uuid */
353 obd_str2uuid(&uuid, new_uuid);
354 rc = import_set_conn_priority(imp, &uuid);
359 /* Check if reconnect is already in progress */
360 spin_lock(&imp->imp_lock);
361 if (imp->imp_state != LUSTRE_IMP_DISCON) {
362 imp->imp_force_verify = 1;
365 spin_unlock(&imp->imp_lock);
369 rc = ptlrpc_connect_import(imp);
374 struct l_wait_info lwi;
375 int secs = cfs_time_seconds(obd_timeout);
377 CDEBUG(D_HA, "%s: recovery started, waiting %u seconds\n",
378 obd2cli_tgt(imp->imp_obd), secs);
380 lwi = LWI_TIMEOUT(secs, NULL, NULL);
381 rc = l_wait_event(imp->imp_recovery_waitq,
382 !ptlrpc_import_in_recovery(imp), &lwi);
383 CDEBUG(D_HA, "%s: recovery finished\n",
384 obd2cli_tgt(imp->imp_obd));
391 EXPORT_SYMBOL(ptlrpc_recover_import);
393 int ptlrpc_import_in_recovery(struct obd_import *imp)
397 spin_lock(&imp->imp_lock);
398 if (imp->imp_state == LUSTRE_IMP_FULL ||
399 imp->imp_state == LUSTRE_IMP_CLOSED ||
400 imp->imp_state == LUSTRE_IMP_DISCON ||
401 imp->imp_obd->obd_no_recov)
403 spin_unlock(&imp->imp_lock);