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36 * lustre/ptlrpc/recover.c
38 * Author: Mike Shaver <shaver@clusterfs.com>
41 #define DEBUG_SUBSYSTEM S_RPC
43 # include <libcfs/libcfs.h>
45 # include <liblustre.h>
48 #include <obd_support.h>
49 #include <lustre_ha.h>
50 #include <lustre_net.h>
51 #include <lustre_import.h>
52 #include <lustre_export.h>
54 #include <obd_class.h>
55 #include <libcfs/list.h>
57 #include "ptlrpc_internal.h"
60 * Start recovery on disconnected import.
61 * This is done by just attempting a connect
63 void ptlrpc_initiate_recovery(struct obd_import *imp)
67 CDEBUG(D_HA, "%s: starting recovery\n", obd2cli_tgt(imp->imp_obd));
68 ptlrpc_connect_import(imp);
74 * Identify what request from replay list needs to be replayed next
75 * (based on what we have already replayed) and send it to server.
77 int ptlrpc_replay_next(struct obd_import *imp, int *inflight)
80 cfs_list_t *tmp, *pos;
81 struct ptlrpc_request *req = NULL;
87 /* It might have committed some after we last spoke, so make sure we
88 * get rid of them now.
90 spin_lock(&imp->imp_lock);
91 imp->imp_last_transno_checked = 0;
92 ptlrpc_free_committed(imp);
93 last_transno = imp->imp_last_replay_transno;
94 spin_unlock(&imp->imp_lock);
96 CDEBUG(D_HA, "import %p from %s committed "LPU64" last "LPU64"\n",
97 imp, obd2cli_tgt(imp->imp_obd),
98 imp->imp_peer_committed_transno, last_transno);
100 /* Do I need to hold a lock across this iteration? We shouldn't be
101 * racing with any additions to the list, because we're in recovery
102 * and are therefore not processing additional requests to add. Calls
103 * to ptlrpc_free_committed might commit requests, but nothing "newer"
104 * than the one we're replaying (it can't be committed until it's
105 * replayed, and we're doing that here). l_f_e_safe protects against
106 * problems with the current request being committed, in the unlikely
107 * event of that race. So, in conclusion, I think that it's safe to
108 * perform this list-walk without the imp_lock held.
110 * But, the {mdc,osc}_replay_open callbacks both iterate
111 * request lists, and have comments saying they assume the
112 * imp_lock is being held by ptlrpc_replay, but it's not. it's
113 * just a little race...
116 /* Replay all the committed open requests on committed_list first */
117 if (!cfs_list_empty(&imp->imp_committed_list)) {
118 tmp = imp->imp_committed_list.prev;
119 req = cfs_list_entry(tmp, struct ptlrpc_request,
122 /* The last request on committed_list hasn't been replayed */
123 if (req->rq_transno > last_transno) {
124 /* Since the imp_committed_list is immutable before
125 * all of it's requests being replayed, it's safe to
126 * use a cursor to accelerate the search */
127 imp->imp_replay_cursor = imp->imp_replay_cursor->next;
129 while (imp->imp_replay_cursor !=
130 &imp->imp_committed_list) {
131 req = cfs_list_entry(imp->imp_replay_cursor,
132 struct ptlrpc_request,
134 if (req->rq_transno > last_transno)
138 imp->imp_replay_cursor =
139 imp->imp_replay_cursor->next;
142 /* All requests on committed_list have been replayed */
143 imp->imp_replay_cursor = &imp->imp_committed_list;
148 /* All the requests in committed list have been replayed, let's replay
149 * the imp_replay_list */
151 cfs_list_for_each_safe(tmp, pos, &imp->imp_replay_list) {
152 req = cfs_list_entry(tmp, struct ptlrpc_request,
155 if (req->rq_transno > last_transno)
161 /* If need to resend the last sent transno (because a reconnect
162 * has occurred), then stop on the matching req and send it again.
163 * If, however, the last sent transno has been committed then we
164 * continue replay from the next request. */
165 if (req != NULL && imp->imp_resend_replay)
166 lustre_msg_add_flags(req->rq_reqmsg, MSG_RESENT);
168 spin_lock(&imp->imp_lock);
169 imp->imp_resend_replay = 0;
170 spin_unlock(&imp->imp_lock);
173 rc = ptlrpc_replay_req(req);
175 CERROR("recovery replay error %d for req "
176 LPU64"\n", rc, req->rq_xid);
185 * Schedule resending of request on sending_list. This is done after
186 * we completed replaying of requests and locks.
188 int ptlrpc_resend(struct obd_import *imp)
190 struct ptlrpc_request *req, *next;
194 /* As long as we're in recovery, nothing should be added to the sending
195 * list, so we don't need to hold the lock during this iteration and
198 /* Well... what if lctl recover is called twice at the same time?
200 spin_lock(&imp->imp_lock);
201 if (imp->imp_state != LUSTRE_IMP_RECOVER) {
202 spin_unlock(&imp->imp_lock);
206 cfs_list_for_each_entry_safe(req, next, &imp->imp_sending_list,
208 LASSERTF((long)req > PAGE_CACHE_SIZE && req != LP_POISON,
209 "req %p bad\n", req);
210 LASSERTF(req->rq_type != LI_POISON, "req %p freed\n", req);
211 if (!ptlrpc_no_resend(req))
212 ptlrpc_resend_req(req);
214 spin_unlock(&imp->imp_lock);
218 EXPORT_SYMBOL(ptlrpc_resend);
221 * Go through all requests in delayed list and wake their threads
224 void ptlrpc_wake_delayed(struct obd_import *imp)
226 cfs_list_t *tmp, *pos;
227 struct ptlrpc_request *req;
229 spin_lock(&imp->imp_lock);
230 cfs_list_for_each_safe(tmp, pos, &imp->imp_delayed_list) {
231 req = cfs_list_entry(tmp, struct ptlrpc_request, rq_list);
233 DEBUG_REQ(D_HA, req, "waking (set %p):", req->rq_set);
234 ptlrpc_client_wake_req(req);
236 spin_unlock(&imp->imp_lock);
238 EXPORT_SYMBOL(ptlrpc_wake_delayed);
240 void ptlrpc_request_handle_notconn(struct ptlrpc_request *failed_req)
242 struct obd_import *imp = failed_req->rq_import;
245 CDEBUG(D_HA, "import %s of %s@%s abruptly disconnected: reconnecting\n",
246 imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd),
247 imp->imp_connection->c_remote_uuid.uuid);
249 if (ptlrpc_set_import_discon(imp,
250 lustre_msg_get_conn_cnt(failed_req->rq_reqmsg))) {
251 if (!imp->imp_replayable) {
252 CDEBUG(D_HA, "import %s@%s for %s not replayable, "
253 "auto-deactivating\n",
254 obd2cli_tgt(imp->imp_obd),
255 imp->imp_connection->c_remote_uuid.uuid,
256 imp->imp_obd->obd_name);
257 ptlrpc_deactivate_import(imp);
259 /* to control recovery via lctl {disable|enable}_recovery */
260 if (imp->imp_deactive == 0)
261 ptlrpc_connect_import(imp);
264 /* Wait for recovery to complete and resend. If evicted, then
265 this request will be errored out later.*/
266 spin_lock(&failed_req->rq_lock);
267 if (!failed_req->rq_no_resend)
268 failed_req->rq_resend = 1;
269 spin_unlock(&failed_req->rq_lock);
275 * Administratively active/deactive a client.
276 * This should only be called by the ioctl interface, currently
277 * - the lctl deactivate and activate commands
278 * - echo 0/1 >> /proc/osc/XXX/active
279 * - client umount -f (ll_umount_begin)
281 int ptlrpc_set_import_active(struct obd_import *imp, int active)
283 struct obd_device *obd = imp->imp_obd;
289 /* When deactivating, mark import invalid, and abort in-flight
292 LCONSOLE_WARN("setting import %s INACTIVE by administrator "
293 "request\n", obd2cli_tgt(imp->imp_obd));
295 /* set before invalidate to avoid messages about imp_inval
296 * set without imp_deactive in ptlrpc_import_delay_req */
297 spin_lock(&imp->imp_lock);
298 imp->imp_deactive = 1;
299 spin_unlock(&imp->imp_lock);
301 obd_import_event(imp->imp_obd, imp, IMP_EVENT_DEACTIVATE);
303 ptlrpc_invalidate_import(imp);
306 /* When activating, mark import valid, and attempt recovery */
308 CDEBUG(D_HA, "setting import %s VALID\n",
309 obd2cli_tgt(imp->imp_obd));
311 spin_lock(&imp->imp_lock);
312 imp->imp_deactive = 0;
313 spin_unlock(&imp->imp_lock);
314 obd_import_event(imp->imp_obd, imp, IMP_EVENT_ACTIVATE);
316 rc = ptlrpc_recover_import(imp, NULL, 0);
321 EXPORT_SYMBOL(ptlrpc_set_import_active);
323 /* Attempt to reconnect an import */
324 int ptlrpc_recover_import(struct obd_import *imp, char *new_uuid, int async)
329 spin_lock(&imp->imp_lock);
330 if (imp->imp_state == LUSTRE_IMP_NEW || imp->imp_deactive ||
331 atomic_read(&imp->imp_inval_count))
333 spin_unlock(&imp->imp_lock);
337 /* force import to be disconnected. */
338 ptlrpc_set_import_discon(imp, 0);
341 struct obd_uuid uuid;
343 /* intruct import to use new uuid */
344 obd_str2uuid(&uuid, new_uuid);
345 rc = import_set_conn_priority(imp, &uuid);
350 /* Check if reconnect is already in progress */
351 spin_lock(&imp->imp_lock);
352 if (imp->imp_state != LUSTRE_IMP_DISCON) {
353 imp->imp_force_verify = 1;
356 spin_unlock(&imp->imp_lock);
360 rc = ptlrpc_connect_import(imp);
365 struct l_wait_info lwi;
366 int secs = cfs_time_seconds(obd_timeout);
368 CDEBUG(D_HA, "%s: recovery started, waiting %u seconds\n",
369 obd2cli_tgt(imp->imp_obd), secs);
371 lwi = LWI_TIMEOUT(secs, NULL, NULL);
372 rc = l_wait_event(imp->imp_recovery_waitq,
373 !ptlrpc_import_in_recovery(imp), &lwi);
374 CDEBUG(D_HA, "%s: recovery finished\n",
375 obd2cli_tgt(imp->imp_obd));
382 EXPORT_SYMBOL(ptlrpc_recover_import);
384 int ptlrpc_import_in_recovery(struct obd_import *imp)
388 spin_lock(&imp->imp_lock);
389 if (imp->imp_state == LUSTRE_IMP_FULL ||
390 imp->imp_state == LUSTRE_IMP_CLOSED ||
391 imp->imp_state == LUSTRE_IMP_DISCON ||
392 imp->imp_obd->obd_no_recov)
394 spin_unlock(&imp->imp_lock);