Viewing: recover.c
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2011, 2017, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
*
* Author: Mike Shaver <shaver@clusterfs.com>
*/
#define DEBUG_SUBSYSTEM S_RPC
#include <linux/list.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_class.h>
#include "ptlrpc_internal.h"
/*
* 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 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;
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);
/* Replay all the committed open requests on committed_list first */
if (!list_empty(&imp->imp_committed_list)) {
req = list_last_entry(&imp->imp_committed_list,
struct ptlrpc_request, rq_replay_list);
/* The last request on committed_list hasn't been replayed */
if (req->rq_transno > last_transno) {
if (!test_bit(IMPF_RESEND_REPLAY, imp->imp_flags) ||
imp->imp_replay_cursor == &imp->imp_committed_list)
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;
LASSERT(!list_empty(imp->imp_replay_cursor));
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) {
struct ptlrpc_request *tmp;
list_for_each_entry(tmp, &imp->imp_replay_list,
rq_replay_list) {
if (tmp->rq_transno > last_transno) {
req = tmp;
break;
}
}
}
/* 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 && test_bit(IMPF_RESEND_REPLAY, imp->imp_flags))
lustre_msg_add_flags(req->rq_reqmsg, MSG_RESENT);
/* ptlrpc_prepare_replay() may fail to add the reqeust into unreplied
* list if the request hasn't been added to replay list then. Another
* exception is that resend replay could have been removed from the
* unreplied list.
*/
if (req != NULL && list_empty(&req->rq_unreplied_list)) {
DEBUG_REQ(D_HA, req, "resend_replay=%d, last_transno=%llu",
test_bit(IMPF_RESEND_REPLAY, imp->imp_flags),
last_transno);
ptlrpc_add_unreplied(req);
imp->imp_known_replied_xid = ptlrpc_known_replied_xid(imp);
}
clear_bit(IMPF_RESEND_REPLAY, imp->imp_flags);
smp_mb__after_atomic();
spin_unlock(&imp->imp_lock);
if (req != NULL) {
LASSERT(!list_empty(&req->rq_unreplied_list));
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;
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(req, &imp->imp_sending_list, rq_list) {
LASSERTF((long)req > PAGE_SIZE && req != LP_POISON,
"req %px bad\n", req);
LASSERTF(req->rq_type != LI_POISON, "req %px freed\n", req);
/* If the request is allowed to be sent during replay and it
* is not timeout yet, then it does not need to be resent.
*/
if (!ptlrpc_no_resend(req) &&
(req->rq_timedout || !req->rq_allow_replay))
ptlrpc_resend_req(req);
}
spin_unlock(&imp->imp_lock);
CFS_FAIL_TIMEOUT(OBD_FAIL_LDLM_ENQUEUE_OLD_EXPORT, 2);
RETURN(0);
}
/*
* Go through all requests in delayed list and wake their threads
* for resending
*/
void ptlrpc_wake_delayed(struct obd_import *imp)
{
struct ptlrpc_request *req;
spin_lock(&imp->imp_lock);
list_for_each_entry(req, &imp->imp_delayed_list, rq_list) {
DEBUG_REQ(D_HA, req, "waking (set %p):", req->rq_set);
ptlrpc_client_wake_req(req);
}
spin_unlock(&imp->imp_lock);
}
void ptlrpc_request_handle_notconn(struct ptlrpc_request *failed_req)
{
struct obd_import *imp = failed_req->rq_import;
int conn = lustre_msg_get_conn_cnt(failed_req->rq_reqmsg);
ENTRY;
CDEBUG(D_HA, "import %s of %s@%s abruptly disconnected: reconnecting\n",
imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd),
libcfs_nidstr(&imp->imp_connection->c_peer.nid));
if (ptlrpc_set_import_discon(imp, conn, true)) {
/* to control recovery via lctl {disable|enable}_recovery */
if (!test_bit(IMPF_DEACTIVE, imp->imp_flags))
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;
}
/**
* ptlrpc_set_import_active() - Administratively active/deactive a client.
* @imp: import object
* @active: flag to activate(1) or de-activate(0)
*
* 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)
*
* Returns:
* * %0 on successful activation/deactivation
* * %negative on failure
*/
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, & 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 IMPF_DEACTIVE in ptlrpc_import_delay_req
*/
set_bit(IMPF_DEACTIVE, imp->imp_flags);
smp_mb__after_atomic();
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));
clear_bit(IMPF_DEACTIVE, imp->imp_flags);
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);
bool ptlrpc_import_in_recovery_disconnect(struct obd_import *imp,
bool disconnect_is_recovery)
{
bool in_recovery = true;
spin_lock(&imp->imp_lock);
if (imp->imp_state < LUSTRE_IMP_DISCON ||
(!disconnect_is_recovery && imp->imp_state == LUSTRE_IMP_DISCON) ||
imp->imp_state >= LUSTRE_IMP_FULL ||
test_bit(OBDF_NO_RECOV, imp->imp_obd->obd_flags))
in_recovery = false;
spin_unlock(&imp->imp_lock);
return in_recovery;
}
/* 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 ||
test_bit(IMPF_DEACTIVE, imp->imp_flags) ||
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, false);
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) {
set_bit(IMPF_FORCE_VERIFY, imp->imp_flags);
rc = -EALREADY;
}
spin_unlock(&imp->imp_lock);
if (!rc) {
CFS_RACE(OBD_FAIL_PTLRPC_CONNECT_RACE);
rc = ptlrpc_connect_import(imp);
}
if (!async && (rc == -EALREADY || rc == 0)) {
long timeout = cfs_time_seconds(obd_timeout);
CDEBUG(D_HA, "%s: recovery started, waiting %u seconds\n",
obd2cli_tgt(imp->imp_obd), obd_timeout);
rc = wait_event_idle_timeout(imp->imp_recovery_waitq,
!ptlrpc_import_in_recovery_disconnect(imp, true),
timeout);
if (rc == 0)
rc = -ETIMEDOUT;
else
rc = 0;
CDEBUG(D_HA, "%s: recovery finished %s, rc = %d\n",
obd2cli_tgt(imp->imp_obd),
ptlrpc_import_state_name(imp->imp_state), rc);
}
EXIT;
out:
return rc;
}
EXPORT_SYMBOL(ptlrpc_recover_import);
bool ptlrpc_import_in_recovery(struct obd_import *imp)
{
return ptlrpc_import_in_recovery_disconnect(imp, false);
}
