diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/ptlrpc/recover.c')
| -rw-r--r-- | drivers/staging/lustre/lustre/ptlrpc/recover.c | 357 |
1 files changed, 357 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lustre/ptlrpc/recover.c b/drivers/staging/lustre/lustre/ptlrpc/recover.c new file mode 100644 index 000000000000..2960889834a2 --- /dev/null +++ b/drivers/staging/lustre/lustre/ptlrpc/recover.c @@ -0,0 +1,357 @@ +/* + * 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 <linux/libcfs/libcfs.h> + +#include <obd_support.h> +#include <lustre_ha.h> +#include <lustre_net.h> +#include <lustre_import.h> +#include <lustre_export.h> +#include <obd.h> +#include <obd_ost.h> +#include <obd_class.h> +#include <obd_lov.h> /* for IOC_LOV_SET_OSC_ACTIVE */ +#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) +{ + ENTRY; + + CDEBUG(D_HA, "%s: starting recovery\n", obd2cli_tgt(imp->imp_obd)); + ptlrpc_connect_import(imp); + + EXIT; +} + +/** + * 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; + ENTRY; + + *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 "LPU64" last "LPU64"\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... + */ + list_for_each_safe(tmp, pos, &imp->imp_replay_list) { + req = list_entry(tmp, struct ptlrpc_request, + rq_replay_list); + + /* 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->rq_transno > last_transno) { + if (imp->imp_resend_replay) + lustre_msg_add_flags(req->rq_reqmsg, + MSG_RESENT); + break; + } + req = NULL; + } + + 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 " + LPU64"\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; + + ENTRY; + + /* 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; + ENTRY; + + 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); + + EXIT; +} + +/** + * 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; + + ENTRY; + 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; + ENTRY; + + 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, rc); + + /* 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, rc); + } + + /* 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); + + rc = ptlrpc_connect_import(imp); + if (rc) + GOTO(out, rc); + + 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)); + } + EXIT; + +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) + in_recovery = 0; + spin_unlock(&imp->imp_lock); + return in_recovery; +} |