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* 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;
}
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