--- /dev/null
+/*
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2011, 2012, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ *
+ * lustre/ptlrpc/recover.c
+ *
+ * Author: Mike Shaver <shaver@clusterfs.com>
+ */
+
+#define DEBUG_SUBSYSTEM S_RPC
+#include "../../include/linux/libcfs/libcfs.h"
+
+#include "../include/obd_support.h"
+#include "../include/lustre_ha.h"
+#include "../include/lustre_net.h"
+#include "../include/lustre_import.h"
+#include "../include/lustre_export.h"
+#include "../include/obd.h"
+#include "../include/obd_class.h"
+#include <linux/list.h>
+
+#include "ptlrpc_internal.h"
+
+/**
+ * Start recovery on disconnected import.
+ * This is done by just attempting a connect
+ */
+void ptlrpc_initiate_recovery(struct obd_import *imp)
+{
+ CDEBUG(D_HA, "%s: starting recovery\n", obd2cli_tgt(imp->imp_obd));
+ ptlrpc_connect_import(imp);
+}
+
+/**
+ * Identify what request from replay list needs to be replayed next
+ * (based on what we have already replayed) and send it to server.
+ */
+int ptlrpc_replay_next(struct obd_import *imp, int *inflight)
+{
+ int rc = 0;
+ struct list_head *tmp, *pos;
+ struct ptlrpc_request *req = NULL;
+ __u64 last_transno;
+
+ *inflight = 0;
+
+ /* It might have committed some after we last spoke, so make sure we
+ * get rid of them now.
+ */
+ spin_lock(&imp->imp_lock);
+ imp->imp_last_transno_checked = 0;
+ ptlrpc_free_committed(imp);
+ last_transno = imp->imp_last_replay_transno;
+ spin_unlock(&imp->imp_lock);
+
+ CDEBUG(D_HA, "import %p from %s committed %llu last %llu\n",
+ imp, obd2cli_tgt(imp->imp_obd),
+ imp->imp_peer_committed_transno, last_transno);
+
+ /* Do I need to hold a lock across this iteration? We shouldn't be
+ * racing with any additions to the list, because we're in recovery
+ * and are therefore not processing additional requests to add. Calls
+ * to ptlrpc_free_committed might commit requests, but nothing "newer"
+ * than the one we're replaying (it can't be committed until it's
+ * replayed, and we're doing that here). l_f_e_safe protects against
+ * problems with the current request being committed, in the unlikely
+ * event of that race. So, in conclusion, I think that it's safe to
+ * perform this list-walk without the imp_lock held.
+ *
+ * But, the {mdc,osc}_replay_open callbacks both iterate
+ * request lists, and have comments saying they assume the
+ * imp_lock is being held by ptlrpc_replay, but it's not. it's
+ * just a little race...
+ */
+
+ /* Replay all the committed open requests on committed_list first */
+ if (!list_empty(&imp->imp_committed_list)) {
+ tmp = imp->imp_committed_list.prev;
+ req = list_entry(tmp, struct ptlrpc_request,
+ rq_replay_list);
+
+ /* The last request on committed_list hasn't been replayed */
+ if (req->rq_transno > last_transno) {
+ /* Since the imp_committed_list is immutable before
+ * all of it's requests being replayed, it's safe to
+ * use a cursor to accelerate the search */
+ imp->imp_replay_cursor = imp->imp_replay_cursor->next;
+
+ while (imp->imp_replay_cursor !=
+ &imp->imp_committed_list) {
+ req = list_entry(imp->imp_replay_cursor,
+ struct ptlrpc_request,
+ rq_replay_list);
+ if (req->rq_transno > last_transno)
+ break;
+
+ req = NULL;
+ imp->imp_replay_cursor =
+ imp->imp_replay_cursor->next;
+ }
+ } else {
+ /* All requests on committed_list have been replayed */
+ imp->imp_replay_cursor = &imp->imp_committed_list;
+ req = NULL;
+ }
+ }
+
+ /* All the requests in committed list have been replayed, let's replay
+ * the imp_replay_list */
+ if (req == NULL) {
+ list_for_each_safe(tmp, pos, &imp->imp_replay_list) {
+ req = list_entry(tmp, struct ptlrpc_request,
+ rq_replay_list);
+
+ if (req->rq_transno > last_transno)
+ break;
+ req = NULL;
+ }
+ }
+
+ /* If need to resend the last sent transno (because a reconnect
+ * has occurred), then stop on the matching req and send it again.
+ * If, however, the last sent transno has been committed then we
+ * continue replay from the next request. */
+ if (req != NULL && imp->imp_resend_replay)
+ lustre_msg_add_flags(req->rq_reqmsg, MSG_RESENT);
+
+ spin_lock(&imp->imp_lock);
+ imp->imp_resend_replay = 0;
+ spin_unlock(&imp->imp_lock);
+
+ if (req != NULL) {
+ rc = ptlrpc_replay_req(req);
+ if (rc) {
+ CERROR("recovery replay error %d for req %llu\n",
+ rc, req->rq_xid);
+ return rc;
+ }
+ *inflight = 1;
+ }
+ return rc;
+}
+
+/**
+ * Schedule resending of request on sending_list. This is done after
+ * we completed replaying of requests and locks.
+ */
+int ptlrpc_resend(struct obd_import *imp)
+{
+ struct ptlrpc_request *req, *next;
+
+ /* As long as we're in recovery, nothing should be added to the sending
+ * list, so we don't need to hold the lock during this iteration and
+ * resend process.
+ */
+ /* Well... what if lctl recover is called twice at the same time?
+ */
+ spin_lock(&imp->imp_lock);
+ if (imp->imp_state != LUSTRE_IMP_RECOVER) {
+ spin_unlock(&imp->imp_lock);
+ return -1;
+ }
+
+ list_for_each_entry_safe(req, next, &imp->imp_sending_list,
+ rq_list) {
+ LASSERTF((long)req > PAGE_CACHE_SIZE && req != LP_POISON,
+ "req %p bad\n", req);
+ LASSERTF(req->rq_type != LI_POISON, "req %p freed\n", req);
+ if (!ptlrpc_no_resend(req))
+ ptlrpc_resend_req(req);
+ }
+ spin_unlock(&imp->imp_lock);
+
+ return 0;
+}
+EXPORT_SYMBOL(ptlrpc_resend);
+
+/**
+ * Go through all requests in delayed list and wake their threads
+ * for resending
+ */
+void ptlrpc_wake_delayed(struct obd_import *imp)
+{
+ struct list_head *tmp, *pos;
+ struct ptlrpc_request *req;
+
+ spin_lock(&imp->imp_lock);
+ list_for_each_safe(tmp, pos, &imp->imp_delayed_list) {
+ req = list_entry(tmp, struct ptlrpc_request, rq_list);
+
+ DEBUG_REQ(D_HA, req, "waking (set %p):", req->rq_set);
+ ptlrpc_client_wake_req(req);
+ }
+ spin_unlock(&imp->imp_lock);
+}
+EXPORT_SYMBOL(ptlrpc_wake_delayed);
+
+void ptlrpc_request_handle_notconn(struct ptlrpc_request *failed_req)
+{
+ struct obd_import *imp = failed_req->rq_import;
+
+ CDEBUG(D_HA, "import %s of %s@%s abruptly disconnected: reconnecting\n",
+ imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd),
+ imp->imp_connection->c_remote_uuid.uuid);
+
+ if (ptlrpc_set_import_discon(imp,
+ lustre_msg_get_conn_cnt(failed_req->rq_reqmsg))) {
+ if (!imp->imp_replayable) {
+ CDEBUG(D_HA, "import %s@%s for %s not replayable, auto-deactivating\n",
+ obd2cli_tgt(imp->imp_obd),
+ imp->imp_connection->c_remote_uuid.uuid,
+ imp->imp_obd->obd_name);
+ ptlrpc_deactivate_import(imp);
+ }
+ /* to control recovery via lctl {disable|enable}_recovery */
+ if (imp->imp_deactive == 0)
+ ptlrpc_connect_import(imp);
+ }
+
+ /* Wait for recovery to complete and resend. If evicted, then
+ this request will be errored out later.*/
+ spin_lock(&failed_req->rq_lock);
+ if (!failed_req->rq_no_resend)
+ failed_req->rq_resend = 1;
+ spin_unlock(&failed_req->rq_lock);
+}
+
+/**
+ * Administratively active/deactive a client.
+ * This should only be called by the ioctl interface, currently
+ * - the lctl deactivate and activate commands
+ * - echo 0/1 >> /proc/osc/XXX/active
+ * - client umount -f (ll_umount_begin)
+ */
+int ptlrpc_set_import_active(struct obd_import *imp, int active)
+{
+ struct obd_device *obd = imp->imp_obd;
+ int rc = 0;
+
+ LASSERT(obd);
+
+ /* When deactivating, mark import invalid, and abort in-flight
+ * requests. */
+ if (!active) {
+ LCONSOLE_WARN("setting import %s INACTIVE by administrator request\n",
+ obd2cli_tgt(imp->imp_obd));
+
+ /* set before invalidate to avoid messages about imp_inval
+ * set without imp_deactive in ptlrpc_import_delay_req */
+ spin_lock(&imp->imp_lock);
+ imp->imp_deactive = 1;
+ spin_unlock(&imp->imp_lock);
+
+ obd_import_event(imp->imp_obd, imp, IMP_EVENT_DEACTIVATE);
+
+ ptlrpc_invalidate_import(imp);
+ }
+
+ /* When activating, mark import valid, and attempt recovery */
+ if (active) {
+ CDEBUG(D_HA, "setting import %s VALID\n",
+ obd2cli_tgt(imp->imp_obd));
+
+ spin_lock(&imp->imp_lock);
+ imp->imp_deactive = 0;
+ spin_unlock(&imp->imp_lock);
+ obd_import_event(imp->imp_obd, imp, IMP_EVENT_ACTIVATE);
+
+ rc = ptlrpc_recover_import(imp, NULL, 0);
+ }
+
+ return rc;
+}
+EXPORT_SYMBOL(ptlrpc_set_import_active);
+
+/* Attempt to reconnect an import */
+int ptlrpc_recover_import(struct obd_import *imp, char *new_uuid, int async)
+{
+ int rc = 0;
+
+ spin_lock(&imp->imp_lock);
+ if (imp->imp_state == LUSTRE_IMP_NEW || imp->imp_deactive ||
+ atomic_read(&imp->imp_inval_count))
+ rc = -EINVAL;
+ spin_unlock(&imp->imp_lock);
+ if (rc)
+ goto out;
+
+ /* force import to be disconnected. */
+ ptlrpc_set_import_discon(imp, 0);
+
+ if (new_uuid) {
+ struct obd_uuid uuid;
+
+ /* intruct import to use new uuid */
+ obd_str2uuid(&uuid, new_uuid);
+ rc = import_set_conn_priority(imp, &uuid);
+ if (rc)
+ goto out;
+ }
+
+ /* Check if reconnect is already in progress */
+ spin_lock(&imp->imp_lock);
+ if (imp->imp_state != LUSTRE_IMP_DISCON) {
+ imp->imp_force_verify = 1;
+ rc = -EALREADY;
+ }
+ spin_unlock(&imp->imp_lock);
+ if (rc)
+ goto out;
+
+ rc = ptlrpc_connect_import(imp);
+ if (rc)
+ goto out;
+
+ if (!async) {
+ struct l_wait_info lwi;
+ int secs = cfs_time_seconds(obd_timeout);
+
+ CDEBUG(D_HA, "%s: recovery started, waiting %u seconds\n",
+ obd2cli_tgt(imp->imp_obd), secs);
+
+ lwi = LWI_TIMEOUT(secs, NULL, NULL);
+ rc = l_wait_event(imp->imp_recovery_waitq,
+ !ptlrpc_import_in_recovery(imp), &lwi);
+ CDEBUG(D_HA, "%s: recovery finished\n",
+ obd2cli_tgt(imp->imp_obd));
+ }
+
+out:
+ return rc;
+}
+EXPORT_SYMBOL(ptlrpc_recover_import);
+
+int ptlrpc_import_in_recovery(struct obd_import *imp)
+{
+ int in_recovery = 1;
+
+ spin_lock(&imp->imp_lock);
+ if (imp->imp_state == LUSTRE_IMP_FULL ||
+ imp->imp_state == LUSTRE_IMP_CLOSED ||
+ imp->imp_state == LUSTRE_IMP_DISCON ||
+ imp->imp_obd->obd_no_recov)
+ in_recovery = 0;
+ spin_unlock(&imp->imp_lock);
+
+ return in_recovery;
+}
Code Review / kvmfornfv.git / blobdiff