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nest-open-source / nest-learning-thermostat / 5.7.1 / linux-imx-ul / refs/heads/master / . / drivers / staging / lustre / lustre / ptlrpc / import.c
blob: d5fc689c008b55cc474d7924e4ccb6f1c4c539c5 [file] [log] [blame]
/*
* 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) 2003, 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/import.c
*
* Author: Mike Shaver <shaver@clusterfs.com>
*/
#define DEBUG_SUBSYSTEM S_RPC
#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_cksum.h"
#include "../include/obd_class.h"
#include "ptlrpc_internal.h"
struct ptlrpc_connect_async_args {
__u64 pcaa_peer_committed;
int pcaa_initial_connect;
};
/**
* Updates import \a imp current state to provided \a state value
* Helper function. Must be called under imp_lock.
*/
static void __import_set_state(struct obd_import *imp,
enum lustre_imp_state state)
{
switch (state) {
case LUSTRE_IMP_CLOSED:
case LUSTRE_IMP_NEW:
case LUSTRE_IMP_DISCON:
case LUSTRE_IMP_CONNECTING:
break;
case LUSTRE_IMP_REPLAY_WAIT:
imp->imp_replay_state = LUSTRE_IMP_REPLAY_LOCKS;
break;
default:
imp->imp_replay_state = LUSTRE_IMP_REPLAY;
}
imp->imp_state = state;
imp->imp_state_hist[imp->imp_state_hist_idx].ish_state = state;
imp->imp_state_hist[imp->imp_state_hist_idx].ish_time =
get_seconds();
imp->imp_state_hist_idx = (imp->imp_state_hist_idx + 1) %
IMP_STATE_HIST_LEN;
}
/* A CLOSED import should remain so. */
#define IMPORT_SET_STATE_NOLOCK(imp, state) \
do { \
if (imp->imp_state != LUSTRE_IMP_CLOSED) { \
CDEBUG(D_HA, "%p %s: changing import state from %s to %s\n", \
imp, obd2cli_tgt(imp->imp_obd), \
ptlrpc_import_state_name(imp->imp_state), \
ptlrpc_import_state_name(state)); \
__import_set_state(imp, state); \
} \
} while (0)
#define IMPORT_SET_STATE(imp, state) \
do { \
spin_lock(&imp->imp_lock); \
IMPORT_SET_STATE_NOLOCK(imp, state); \
spin_unlock(&imp->imp_lock); \
} while (0)
static int ptlrpc_connect_interpret(const struct lu_env *env,
struct ptlrpc_request *request,
void *data, int rc);
int ptlrpc_import_recovery_state_machine(struct obd_import *imp);
/* Only this function is allowed to change the import state when it is
* CLOSED. I would rather refcount the import and free it after
* disconnection like we do with exports. To do that, the client_obd
* will need to save the peer info somewhere other than in the import,
* though. */
int ptlrpc_init_import(struct obd_import *imp)
{
spin_lock(&imp->imp_lock);
imp->imp_generation++;
imp->imp_state = LUSTRE_IMP_NEW;
spin_unlock(&imp->imp_lock);
return 0;
}
EXPORT_SYMBOL(ptlrpc_init_import);
#define UUID_STR "_UUID"
void deuuidify(char *uuid, const char *prefix, char **uuid_start, int *uuid_len)
{
*uuid_start = !prefix || strncmp(uuid, prefix, strlen(prefix))
? uuid : uuid + strlen(prefix);
*uuid_len = strlen(*uuid_start);
if (*uuid_len < strlen(UUID_STR))
return;
if (!strncmp(*uuid_start + *uuid_len - strlen(UUID_STR),
UUID_STR, strlen(UUID_STR)))
*uuid_len -= strlen(UUID_STR);
}
EXPORT_SYMBOL(deuuidify);
/**
* Returns true if import was FULL, false if import was already not
* connected.
* @imp - import to be disconnected
* @conn_cnt - connection count (epoch) of the request that timed out
* and caused the disconnection. In some cases, multiple
* inflight requests can fail to a single target (e.g. OST
* bulk requests) and if one has already caused a reconnection
* (increasing the import->conn_cnt) the older failure should
* not also cause a reconnection. If zero it forces a reconnect.
*/
int ptlrpc_set_import_discon(struct obd_import *imp, __u32 conn_cnt)
{
int rc = 0;
spin_lock(&imp->imp_lock);
if (imp->imp_state == LUSTRE_IMP_FULL &&
(conn_cnt == 0 || conn_cnt == imp->imp_conn_cnt)) {
char *target_start;
int target_len;
deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
&target_start, &target_len);
if (imp->imp_replayable) {
LCONSOLE_WARN("%s: Connection to %.*s (at %s) was lost; in progress operations using this service will wait for recovery to complete\n",
imp->imp_obd->obd_name, target_len, target_start,
libcfs_nid2str(imp->imp_connection->c_peer.nid));
} else {
LCONSOLE_ERROR_MSG(0x166, "%s: Connection to %.*s (at %s) was lost; in progress operations using this service will fail\n",
imp->imp_obd->obd_name,
target_len, target_start,
libcfs_nid2str(imp->imp_connection->c_peer.nid));
}
IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
spin_unlock(&imp->imp_lock);
if (obd_dump_on_timeout)
libcfs_debug_dumplog();
obd_import_event(imp->imp_obd, imp, IMP_EVENT_DISCON);
rc = 1;
} else {
spin_unlock(&imp->imp_lock);
CDEBUG(D_HA, "%s: import %p already %s (conn %u, was %u): %s\n",
imp->imp_client->cli_name, imp,
(imp->imp_state == LUSTRE_IMP_FULL &&
imp->imp_conn_cnt > conn_cnt) ?
"reconnected" : "not connected", imp->imp_conn_cnt,
conn_cnt, ptlrpc_import_state_name(imp->imp_state));
}
return rc;
}
/* Must be called with imp_lock held! */
static void ptlrpc_deactivate_and_unlock_import(struct obd_import *imp)
{
assert_spin_locked(&imp->imp_lock);
CDEBUG(D_HA, "setting import %s INVALID\n", obd2cli_tgt(imp->imp_obd));
imp->imp_invalid = 1;
imp->imp_generation++;
spin_unlock(&imp->imp_lock);
ptlrpc_abort_inflight(imp);
obd_import_event(imp->imp_obd, imp, IMP_EVENT_INACTIVE);
}
/*
* This acts as a barrier; all existing requests are rejected, and
* no new requests will be accepted until the import is valid again.
*/
void ptlrpc_deactivate_import(struct obd_import *imp)
{
spin_lock(&imp->imp_lock);
ptlrpc_deactivate_and_unlock_import(imp);
}
EXPORT_SYMBOL(ptlrpc_deactivate_import);
static unsigned int
ptlrpc_inflight_deadline(struct ptlrpc_request *req, time_t now)
{
long dl;
if (!(((req->rq_phase == RQ_PHASE_RPC) && !req->rq_waiting) ||
(req->rq_phase == RQ_PHASE_BULK) ||
(req->rq_phase == RQ_PHASE_NEW)))
return 0;
if (req->rq_timedout)
return 0;
if (req->rq_phase == RQ_PHASE_NEW)
dl = req->rq_sent;
else
dl = req->rq_deadline;
if (dl <= now)
return 0;
return dl - now;
}
static unsigned int ptlrpc_inflight_timeout(struct obd_import *imp)
{
time_t now = get_seconds();
struct list_head *tmp, *n;
struct ptlrpc_request *req;
unsigned int timeout = 0;
spin_lock(&imp->imp_lock);
list_for_each_safe(tmp, n, &imp->imp_sending_list) {
req = list_entry(tmp, struct ptlrpc_request, rq_list);
timeout = max(ptlrpc_inflight_deadline(req, now), timeout);
}
spin_unlock(&imp->imp_lock);
return timeout;
}
/**
* This function will invalidate the import, if necessary, then block
* for all the RPC completions, and finally notify the obd to
* invalidate its state (ie cancel locks, clear pending requests,
* etc).
*/
void ptlrpc_invalidate_import(struct obd_import *imp)
{
struct list_head *tmp, *n;
struct ptlrpc_request *req;
struct l_wait_info lwi;
unsigned int timeout;
int rc;
atomic_inc(&imp->imp_inval_count);
if (!imp->imp_invalid || imp->imp_obd->obd_no_recov)
ptlrpc_deactivate_import(imp);
CFS_FAIL_TIMEOUT(OBD_FAIL_MGS_CONNECT_NET, 3 * cfs_fail_val / 2);
LASSERT(imp->imp_invalid);
/* Wait forever until inflight == 0. We really can't do it another
* way because in some cases we need to wait for very long reply
* unlink. We can't do anything before that because there is really
* no guarantee that some rdma transfer is not in progress right now. */
do {
/* Calculate max timeout for waiting on rpcs to error
* out. Use obd_timeout if calculated value is smaller
* than it. */
if (!OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK)) {
timeout = ptlrpc_inflight_timeout(imp);
timeout += timeout / 3;
if (timeout == 0)
timeout = obd_timeout;
} else {
/* decrease the interval to increase race condition */
timeout = 1;
}
CDEBUG(D_RPCTRACE,
"Sleeping %d sec for inflight to error out\n",
timeout);
/* Wait for all requests to error out and call completion
* callbacks. Cap it at obd_timeout -- these should all
* have been locally cancelled by ptlrpc_abort_inflight. */
lwi = LWI_TIMEOUT_INTERVAL(
cfs_timeout_cap(cfs_time_seconds(timeout)),
(timeout > 1)?cfs_time_seconds(1):cfs_time_seconds(1)/2,
NULL, NULL);
rc = l_wait_event(imp->imp_recovery_waitq,
(atomic_read(&imp->imp_inflight) == 0),
&lwi);
if (rc) {
const char *cli_tgt = obd2cli_tgt(imp->imp_obd);
CERROR("%s: rc = %d waiting for callback (%d != 0)\n",
cli_tgt, rc,
atomic_read(&imp->imp_inflight));
spin_lock(&imp->imp_lock);
if (atomic_read(&imp->imp_inflight) == 0) {
int count = atomic_read(&imp->imp_unregistering);
/* We know that "unregistering" rpcs only can
* survive in sending or delaying lists (they
* maybe waiting for long reply unlink in
* sluggish nets). Let's check this. If there
* is no inflight and unregistering != 0, this
* is bug. */
LASSERTF(count == 0, "Some RPCs are still unregistering: %d\n",
count);
/* Let's save one loop as soon as inflight have
* dropped to zero. No new inflights possible at
* this point. */
rc = 0;
} else {
list_for_each_safe(tmp, n,
&imp->imp_sending_list) {
req = list_entry(tmp,
struct ptlrpc_request,
rq_list);
DEBUG_REQ(D_ERROR, req,
"still on sending list");
}
list_for_each_safe(tmp, n,
&imp->imp_delayed_list) {
req = list_entry(tmp,
struct ptlrpc_request,
rq_list);
DEBUG_REQ(D_ERROR, req,
"still on delayed list");
}
CERROR("%s: RPCs in \"%s\" phase found (%d). Network is sluggish? Waiting them to error out.\n",
cli_tgt,
ptlrpc_phase2str(RQ_PHASE_UNREGISTERING),
atomic_read(&imp->
imp_unregistering));
}
spin_unlock(&imp->imp_lock);
}
} while (rc != 0);
/*
* Let's additionally check that no new rpcs added to import in
* "invalidate" state.
*/
LASSERT(atomic_read(&imp->imp_inflight) == 0);
obd_import_event(imp->imp_obd, imp, IMP_EVENT_INVALIDATE);
sptlrpc_import_flush_all_ctx(imp);
atomic_dec(&imp->imp_inval_count);
wake_up_all(&imp->imp_recovery_waitq);
}
EXPORT_SYMBOL(ptlrpc_invalidate_import);
/* unset imp_invalid */
void ptlrpc_activate_import(struct obd_import *imp)
{
struct obd_device *obd = imp->imp_obd;
spin_lock(&imp->imp_lock);
if (imp->imp_deactive != 0) {
spin_unlock(&imp->imp_lock);
return;
}
imp->imp_invalid = 0;
spin_unlock(&imp->imp_lock);
obd_import_event(obd, imp, IMP_EVENT_ACTIVE);
}
EXPORT_SYMBOL(ptlrpc_activate_import);
static void ptlrpc_pinger_force(struct obd_import *imp)
{
CDEBUG(D_HA, "%s: waking up pinger s:%s\n", obd2cli_tgt(imp->imp_obd),
ptlrpc_import_state_name(imp->imp_state));
spin_lock(&imp->imp_lock);
imp->imp_force_verify = 1;
spin_unlock(&imp->imp_lock);
if (imp->imp_state != LUSTRE_IMP_CONNECTING)
ptlrpc_pinger_wake_up();
}
void ptlrpc_fail_import(struct obd_import *imp, __u32 conn_cnt)
{
LASSERT(!imp->imp_dlm_fake);
if (ptlrpc_set_import_discon(imp, conn_cnt)) {
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);
}
ptlrpc_pinger_force(imp);
}
}
EXPORT_SYMBOL(ptlrpc_fail_import);
int ptlrpc_reconnect_import(struct obd_import *imp)
{
#ifdef ENABLE_PINGER
struct l_wait_info lwi;
int secs = cfs_time_seconds(obd_timeout);
int rc;
ptlrpc_pinger_force(imp);
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 s:%s\n", obd2cli_tgt(imp->imp_obd),
ptlrpc_import_state_name(imp->imp_state));
return rc;
#else
ptlrpc_set_import_discon(imp, 0);
/* Force a new connect attempt */
ptlrpc_invalidate_import(imp);
/* Do a fresh connect next time by zeroing the handle */
ptlrpc_disconnect_import(imp, 1);
/* Wait for all invalidate calls to finish */
if (atomic_read(&imp->imp_inval_count) > 0) {
int rc;
struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
rc = l_wait_event(imp->imp_recovery_waitq,
(atomic_read(&imp->imp_inval_count) == 0),
&lwi);
if (rc)
CERROR("Interrupted, inval=%d\n",
atomic_read(&imp->imp_inval_count));
}
/* Allow reconnect attempts */
imp->imp_obd->obd_no_recov = 0;
/* Remove 'invalid' flag */
ptlrpc_activate_import(imp);
/* Attempt a new connect */
ptlrpc_recover_import(imp, NULL, 0);
return 0;
#endif
}
EXPORT_SYMBOL(ptlrpc_reconnect_import);
/**
* Connection on import \a imp is changed to another one (if more than one is
* present). We typically chose connection that we have not tried to connect to
* the longest
*/
static int import_select_connection(struct obd_import *imp)
{
struct obd_import_conn *imp_conn = NULL, *conn;
struct obd_export *dlmexp;
char *target_start;
int target_len, tried_all = 1;
spin_lock(&imp->imp_lock);
if (list_empty(&imp->imp_conn_list)) {
CERROR("%s: no connections available\n",
imp->imp_obd->obd_name);
spin_unlock(&imp->imp_lock);
return -EINVAL;
}
list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
CDEBUG(D_HA, "%s: connect to NID %s last attempt %llu\n",
imp->imp_obd->obd_name,
libcfs_nid2str(conn->oic_conn->c_peer.nid),
conn->oic_last_attempt);
/* If we have not tried this connection since
the last successful attempt, go with this one */
if ((conn->oic_last_attempt == 0) ||
cfs_time_beforeq_64(conn->oic_last_attempt,
imp->imp_last_success_conn)) {
imp_conn = conn;
tried_all = 0;
break;
}
/* If all of the connections have already been tried
since the last successful connection; just choose the
least recently used */
if (!imp_conn)
imp_conn = conn;
else if (cfs_time_before_64(conn->oic_last_attempt,
imp_conn->oic_last_attempt))
imp_conn = conn;
}
/* if not found, simply choose the current one */
if (!imp_conn || imp->imp_force_reconnect) {
LASSERT(imp->imp_conn_current);
imp_conn = imp->imp_conn_current;
tried_all = 0;
}
LASSERT(imp_conn->oic_conn);
/* If we've tried everything, and we're back to the beginning of the
list, increase our timeout and try again. It will be reset when
we do finally connect. (FIXME: really we should wait for all network
state associated with the last connection attempt to drain before
trying to reconnect on it.) */
if (tried_all && (imp->imp_conn_list.next == &imp_conn->oic_item)) {
struct adaptive_timeout *at = &imp->imp_at.iat_net_latency;
if (at_get(at) < CONNECTION_SWITCH_MAX) {
at_measured(at, at_get(at) + CONNECTION_SWITCH_INC);
if (at_get(at) > CONNECTION_SWITCH_MAX)
at_reset(at, CONNECTION_SWITCH_MAX);
}
LASSERT(imp_conn->oic_last_attempt);
CDEBUG(D_HA, "%s: tried all connections, increasing latency to %ds\n",
imp->imp_obd->obd_name, at_get(at));
}
imp_conn->oic_last_attempt = cfs_time_current_64();
/* switch connection, don't mind if it's same as the current one */
if (imp->imp_connection)
ptlrpc_connection_put(imp->imp_connection);
imp->imp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
dlmexp = class_conn2export(&imp->imp_dlm_handle);
LASSERT(dlmexp != NULL);
if (dlmexp->exp_connection)
ptlrpc_connection_put(dlmexp->exp_connection);
dlmexp->exp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
class_export_put(dlmexp);
if (imp->imp_conn_current != imp_conn) {
if (imp->imp_conn_current) {
deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
&target_start, &target_len);
CDEBUG(D_HA, "%s: Connection changing to %.*s (at %s)\n",
imp->imp_obd->obd_name,
target_len, target_start,
libcfs_nid2str(imp_conn->oic_conn->c_peer.nid));
}
imp->imp_conn_current = imp_conn;
}
CDEBUG(D_HA, "%s: import %p using connection %s/%s\n",
imp->imp_obd->obd_name, imp, imp_conn->oic_uuid.uuid,
libcfs_nid2str(imp_conn->oic_conn->c_peer.nid));
spin_unlock(&imp->imp_lock);
return 0;
}
/*
* must be called under imp_lock
*/
static int ptlrpc_first_transno(struct obd_import *imp, __u64 *transno)
{
struct ptlrpc_request *req;
struct list_head *tmp;
/* The requests in committed_list always have smaller transnos than
* the requests in replay_list */
if (!list_empty(&imp->imp_committed_list)) {
tmp = imp->imp_committed_list.next;
req = list_entry(tmp, struct ptlrpc_request, rq_replay_list);
*transno = req->rq_transno;
if (req->rq_transno == 0) {
DEBUG_REQ(D_ERROR, req,
"zero transno in committed_list");
LBUG();
}
return 1;
}
if (!list_empty(&imp->imp_replay_list)) {
tmp = imp->imp_replay_list.next;
req = list_entry(tmp, struct ptlrpc_request, rq_replay_list);
*transno = req->rq_transno;
if (req->rq_transno == 0) {
DEBUG_REQ(D_ERROR, req, "zero transno in replay_list");
LBUG();
}
return 1;
}
return 0;
}
/**
* Attempt to (re)connect import \a imp. This includes all preparations,
* initializing CONNECT RPC request and passing it to ptlrpcd for
* actual sending.
* Returns 0 on success or error code.
*/
int ptlrpc_connect_import(struct obd_import *imp)
{
struct obd_device *obd = imp->imp_obd;
int initial_connect = 0;
int set_transno = 0;
__u64 committed_before_reconnect = 0;
struct ptlrpc_request *request;
char *bufs[] = { NULL,
obd2cli_tgt(imp->imp_obd),
obd->obd_uuid.uuid,
(char *)&imp->imp_dlm_handle,
(char *)&imp->imp_connect_data };
struct ptlrpc_connect_async_args *aa;
int rc;
spin_lock(&imp->imp_lock);
if (imp->imp_state == LUSTRE_IMP_CLOSED) {
spin_unlock(&imp->imp_lock);
CERROR("can't connect to a closed import\n");
return -EINVAL;
} else if (imp->imp_state == LUSTRE_IMP_FULL) {
spin_unlock(&imp->imp_lock);
CERROR("already connected\n");
return 0;
} else if (imp->imp_state == LUSTRE_IMP_CONNECTING) {
spin_unlock(&imp->imp_lock);
CERROR("already connecting\n");
return -EALREADY;
}
IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CONNECTING);
imp->imp_conn_cnt++;
imp->imp_resend_replay = 0;
if (!lustre_handle_is_used(&imp->imp_remote_handle))
initial_connect = 1;
else
committed_before_reconnect = imp->imp_peer_committed_transno;
set_transno = ptlrpc_first_transno(imp,
&imp->imp_connect_data.ocd_transno);
spin_unlock(&imp->imp_lock);
rc = import_select_connection(imp);
if (rc)
goto out;
rc = sptlrpc_import_sec_adapt(imp, NULL, NULL);
if (rc)
goto out;
/* Reset connect flags to the originally requested flags, in case
* the server is updated on-the-fly we will get the new features. */
imp->imp_connect_data.ocd_connect_flags = imp->imp_connect_flags_orig;
/* Reset ocd_version each time so the server knows the exact versions */
imp->imp_connect_data.ocd_version = LUSTRE_VERSION_CODE;
imp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
imp->imp_msghdr_flags &= ~MSGHDR_CKSUM_INCOMPAT18;
rc = obd_reconnect(NULL, imp->imp_obd->obd_self_export, obd,
&obd->obd_uuid, &imp->imp_connect_data, NULL);
if (rc)
goto out;
request = ptlrpc_request_alloc(imp, &RQF_MDS_CONNECT);
if (request == NULL) {
rc = -ENOMEM;
goto out;
}
rc = ptlrpc_request_bufs_pack(request, LUSTRE_OBD_VERSION,
imp->imp_connect_op, bufs, NULL);
if (rc) {
ptlrpc_request_free(request);
goto out;
}
/* Report the rpc service time to the server so that it knows how long
* to wait for clients to join recovery */
lustre_msg_set_service_time(request->rq_reqmsg,
at_timeout2est(request->rq_timeout));
/* The amount of time we give the server to process the connect req.
* import_select_connection will increase the net latency on
* repeated reconnect attempts to cover slow networks.
* We override/ignore the server rpc completion estimate here,
* which may be large if this is a reconnect attempt */
request->rq_timeout = INITIAL_CONNECT_TIMEOUT;
lustre_msg_set_timeout(request->rq_reqmsg, request->rq_timeout);
lustre_msg_add_op_flags(request->rq_reqmsg, MSG_CONNECT_NEXT_VER);
request->rq_no_resend = request->rq_no_delay = 1;
request->rq_send_state = LUSTRE_IMP_CONNECTING;
/* Allow a slightly larger reply for future growth compatibility */
req_capsule_set_size(&request->rq_pill, &RMF_CONNECT_DATA, RCL_SERVER,
sizeof(struct obd_connect_data)+16*sizeof(__u64));
ptlrpc_request_set_replen(request);
request->rq_interpret_reply = ptlrpc_connect_interpret;
CLASSERT(sizeof(*aa) <= sizeof(request->rq_async_args));
aa = ptlrpc_req_async_args(request);
memset(aa, 0, sizeof(*aa));
aa->pcaa_peer_committed = committed_before_reconnect;
aa->pcaa_initial_connect = initial_connect;
if (aa->pcaa_initial_connect) {
spin_lock(&imp->imp_lock);
imp->imp_replayable = 1;
spin_unlock(&imp->imp_lock);
lustre_msg_add_op_flags(request->rq_reqmsg,
MSG_CONNECT_INITIAL);
}
if (set_transno)
lustre_msg_add_op_flags(request->rq_reqmsg,
MSG_CONNECT_TRANSNO);
DEBUG_REQ(D_RPCTRACE, request, "(re)connect request (timeout %d)",
request->rq_timeout);
ptlrpcd_add_req(request, PDL_POLICY_ROUND, -1);
rc = 0;
out:
if (rc != 0) {
IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
}
return rc;
}
EXPORT_SYMBOL(ptlrpc_connect_import);
static void ptlrpc_maybe_ping_import_soon(struct obd_import *imp)
{
int force_verify;
spin_lock(&imp->imp_lock);
force_verify = imp->imp_force_verify != 0;
spin_unlock(&imp->imp_lock);
if (force_verify)
ptlrpc_pinger_wake_up();
}
static int ptlrpc_busy_reconnect(int rc)
{
return (rc == -EBUSY) || (rc == -EAGAIN);
}
/**
* interpret_reply callback for connect RPCs.
* Looks into returned status of connect operation and decides
* what to do with the import - i.e enter recovery, promote it to
* full state for normal operations of disconnect it due to an error.
*/
static int ptlrpc_connect_interpret(const struct lu_env *env,
struct ptlrpc_request *request,
void *data, int rc)
{
struct ptlrpc_connect_async_args *aa = data;
struct obd_import *imp = request->rq_import;
struct client_obd *cli = &imp->imp_obd->u.cli;
struct lustre_handle old_hdl;
__u64 old_connect_flags;
int msg_flags;
struct obd_connect_data *ocd;
struct obd_export *exp;
int ret;
spin_lock(&imp->imp_lock);
if (imp->imp_state == LUSTRE_IMP_CLOSED) {
imp->imp_connect_tried = 1;
spin_unlock(&imp->imp_lock);
return 0;
}
if (rc) {
/* if this reconnect to busy export - not need select new target
* for connecting*/
imp->imp_force_reconnect = ptlrpc_busy_reconnect(rc);
spin_unlock(&imp->imp_lock);
ptlrpc_maybe_ping_import_soon(imp);
goto out;
}
spin_unlock(&imp->imp_lock);
LASSERT(imp->imp_conn_current);
msg_flags = lustre_msg_get_op_flags(request->rq_repmsg);
ret = req_capsule_get_size(&request->rq_pill, &RMF_CONNECT_DATA,
RCL_SERVER);
/* server replied obd_connect_data is always bigger */
ocd = req_capsule_server_sized_get(&request->rq_pill,
&RMF_CONNECT_DATA, ret);
if (ocd == NULL) {
CERROR("%s: no connect data from server\n",
imp->imp_obd->obd_name);
rc = -EPROTO;
goto out;
}
spin_lock(&imp->imp_lock);
/* All imports are pingable */
imp->imp_pingable = 1;
imp->imp_force_reconnect = 0;
imp->imp_force_verify = 0;
imp->imp_connect_data = *ocd;
CDEBUG(D_HA, "%s: connect to target with instance %u\n",
imp->imp_obd->obd_name, ocd->ocd_instance);
exp = class_conn2export(&imp->imp_dlm_handle);
spin_unlock(&imp->imp_lock);
/* check that server granted subset of flags we asked for. */
if ((ocd->ocd_connect_flags & imp->imp_connect_flags_orig) !=
ocd->ocd_connect_flags) {
CERROR("%s: Server didn't granted asked subset of flags: asked=%#llx grranted=%#llx\n",
imp->imp_obd->obd_name, imp->imp_connect_flags_orig,
ocd->ocd_connect_flags);
rc = -EPROTO;
goto out;
}
if (!exp) {
/* This could happen if export is cleaned during the
connect attempt */
CERROR("%s: missing export after connect\n",
imp->imp_obd->obd_name);
rc = -ENODEV;
goto out;
}
old_connect_flags = exp_connect_flags(exp);
exp->exp_connect_data = *ocd;
imp->imp_obd->obd_self_export->exp_connect_data = *ocd;
class_export_put(exp);
obd_import_event(imp->imp_obd, imp, IMP_EVENT_OCD);
if (aa->pcaa_initial_connect) {
spin_lock(&imp->imp_lock);
if (msg_flags & MSG_CONNECT_REPLAYABLE) {
imp->imp_replayable = 1;
spin_unlock(&imp->imp_lock);
CDEBUG(D_HA, "connected to replayable target: %s\n",
obd2cli_tgt(imp->imp_obd));
} else {
imp->imp_replayable = 0;
spin_unlock(&imp->imp_lock);
}
/* if applies, adjust the imp->imp_msg_magic here
* according to reply flags */
imp->imp_remote_handle =
*lustre_msg_get_handle(request->rq_repmsg);
/* Initial connects are allowed for clients with non-random
* uuids when servers are in recovery. Simply signal the
* servers replay is complete and wait in REPLAY_WAIT. */
if (msg_flags & MSG_CONNECT_RECOVERING) {
CDEBUG(D_HA, "connect to %s during recovery\n",
obd2cli_tgt(imp->imp_obd));
IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
} else {
IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
ptlrpc_activate_import(imp);
}
rc = 0;
goto finish;
}
/* Determine what recovery state to move the import to. */
if (MSG_CONNECT_RECONNECT & msg_flags) {
memset(&old_hdl, 0, sizeof(old_hdl));
if (!memcmp(&old_hdl, lustre_msg_get_handle(request->rq_repmsg),
sizeof(old_hdl))) {
LCONSOLE_WARN("Reconnect to %s (at @%s) failed due bad handle %#llx\n",
obd2cli_tgt(imp->imp_obd),
imp->imp_connection->c_remote_uuid.uuid,
imp->imp_dlm_handle.cookie);
rc = -ENOTCONN;
goto out;
}
if (memcmp(&imp->imp_remote_handle,
lustre_msg_get_handle(request->rq_repmsg),
sizeof(imp->imp_remote_handle))) {
int level = msg_flags & MSG_CONNECT_RECOVERING ?
D_HA : D_WARNING;
/* Bug 16611/14775: if server handle have changed,
* that means some sort of disconnection happened.
* If the server is not in recovery, that also means it
* already erased all of our state because of previous
* eviction. If it is in recovery - we are safe to
* participate since we can reestablish all of our state
* with server again */
if ((MSG_CONNECT_RECOVERING & msg_flags)) {
CDEBUG(level, "%s@%s changed server handle from %#llx to %#llx but is still in recovery\n",
obd2cli_tgt(imp->imp_obd),
imp->imp_connection->c_remote_uuid.uuid,
imp->imp_remote_handle.cookie,
lustre_msg_get_handle(
request->rq_repmsg)->cookie);
} else {
LCONSOLE_WARN("Evicted from %s (at %s) after server handle changed from %#llx to %#llx\n",
obd2cli_tgt(imp->imp_obd),
imp->imp_connection-> \
c_remote_uuid.uuid,
imp->imp_remote_handle.cookie,
lustre_msg_get_handle(
request->rq_repmsg)->cookie);
}
imp->imp_remote_handle =
*lustre_msg_get_handle(request->rq_repmsg);
if (!(MSG_CONNECT_RECOVERING & msg_flags)) {
IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
rc = 0;
goto finish;
}
} else {
CDEBUG(D_HA, "reconnected to %s@%s after partition\n",
obd2cli_tgt(imp->imp_obd),
imp->imp_connection->c_remote_uuid.uuid);
}
if (imp->imp_invalid) {
CDEBUG(D_HA, "%s: reconnected but import is invalid; marking evicted\n",
imp->imp_obd->obd_name);
IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
} else if (MSG_CONNECT_RECOVERING & msg_flags) {
CDEBUG(D_HA, "%s: reconnected to %s during replay\n",
imp->imp_obd->obd_name,
obd2cli_tgt(imp->imp_obd));
spin_lock(&imp->imp_lock);
imp->imp_resend_replay = 1;
spin_unlock(&imp->imp_lock);
IMPORT_SET_STATE(imp, imp->imp_replay_state);
} else {
IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
}
} else if ((MSG_CONNECT_RECOVERING & msg_flags) && !imp->imp_invalid) {
LASSERT(imp->imp_replayable);
imp->imp_remote_handle =
*lustre_msg_get_handle(request->rq_repmsg);
imp->imp_last_replay_transno = 0;
IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
} else {
DEBUG_REQ(D_HA, request, "%s: evicting (reconnect/recover flags not set: %x)",
imp->imp_obd->obd_name, msg_flags);
imp->imp_remote_handle =
*lustre_msg_get_handle(request->rq_repmsg);
IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
}
/* Sanity checks for a reconnected import. */
if (!(imp->imp_replayable) != !(msg_flags & MSG_CONNECT_REPLAYABLE)) {
CERROR("imp_replayable flag does not match server after reconnect. We should LBUG right here.\n");
}
if (lustre_msg_get_last_committed(request->rq_repmsg) > 0 &&
lustre_msg_get_last_committed(request->rq_repmsg) <
aa->pcaa_peer_committed) {
CERROR("%s went back in time (transno %lld was previously committed, server now claims %lld)! See https://bugzilla.lustre.org/show_bug.cgi?id=9646\n",
obd2cli_tgt(imp->imp_obd), aa->pcaa_peer_committed,
lustre_msg_get_last_committed(request->rq_repmsg));
}
finish:
rc = ptlrpc_import_recovery_state_machine(imp);
if (rc != 0) {
if (rc == -ENOTCONN) {
CDEBUG(D_HA, "evicted/aborted by %s@%s during recovery; invalidating and reconnecting\n",
obd2cli_tgt(imp->imp_obd),
imp->imp_connection->c_remote_uuid.uuid);
ptlrpc_connect_import(imp);
imp->imp_connect_tried = 1;
return 0;
}
} else {
spin_lock(&imp->imp_lock);
list_del(&imp->imp_conn_current->oic_item);
list_add(&imp->imp_conn_current->oic_item,
&imp->imp_conn_list);
imp->imp_last_success_conn =
imp->imp_conn_current->oic_last_attempt;
spin_unlock(&imp->imp_lock);
if ((imp->imp_connect_flags_orig & OBD_CONNECT_IBITS) &&
!(ocd->ocd_connect_flags & OBD_CONNECT_IBITS)) {
LCONSOLE_WARN("%s: MDS %s does not support ibits lock, either very old or invalid: requested %llx, replied %llx\n",
imp->imp_obd->obd_name,
imp->imp_connection->c_remote_uuid.uuid,
imp->imp_connect_flags_orig,
ocd->ocd_connect_flags);
rc = -EPROTO;
goto out;
}
if ((ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
(ocd->ocd_version > LUSTRE_VERSION_CODE +
LUSTRE_VERSION_OFFSET_WARN ||
ocd->ocd_version < LUSTRE_VERSION_CODE -
LUSTRE_VERSION_OFFSET_WARN)) {
/* Sigh, some compilers do not like #ifdef in the middle
of macro arguments */
const char *older = "older. Consider upgrading server or downgrading client"
;
const char *newer = "newer than client version. Consider upgrading client"
;
LCONSOLE_WARN("Server %s version (%d.%d.%d.%d) is much %s (%s)\n",
obd2cli_tgt(imp->imp_obd),
OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
OBD_OCD_VERSION_MINOR(ocd->ocd_version),
OBD_OCD_VERSION_PATCH(ocd->ocd_version),
OBD_OCD_VERSION_FIX(ocd->ocd_version),
ocd->ocd_version > LUSTRE_VERSION_CODE ?
newer : older, LUSTRE_VERSION_STRING);
}
#if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 2, 50, 0)
/* Check if server has LU-1252 fix applied to not always swab
* the IR MNE entries. Do this only once per connection. This
* fixup is version-limited, because we don't want to carry the
* OBD_CONNECT_MNE_SWAB flag around forever, just so long as we
* need interop with unpatched 2.2 servers. For newer servers,
* the client will do MNE swabbing only as needed. LU-1644 */
if (unlikely((ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
!(ocd->ocd_connect_flags & OBD_CONNECT_MNE_SWAB) &&
OBD_OCD_VERSION_MAJOR(ocd->ocd_version) == 2 &&
OBD_OCD_VERSION_MINOR(ocd->ocd_version) == 2 &&
OBD_OCD_VERSION_PATCH(ocd->ocd_version) < 55 &&
strcmp(imp->imp_obd->obd_type->typ_name,
LUSTRE_MGC_NAME) == 0))
imp->imp_need_mne_swab = 1;
else /* clear if server was upgraded since last connect */
imp->imp_need_mne_swab = 0;
#else
#warning "LU-1644: Remove old OBD_CONNECT_MNE_SWAB fixup and imp_need_mne_swab"
#endif
if (ocd->ocd_connect_flags & OBD_CONNECT_CKSUM) {
/* We sent to the server ocd_cksum_types with bits set
* for algorithms we understand. The server masked off
* the checksum types it doesn't support */
if ((ocd->ocd_cksum_types &
cksum_types_supported_client()) == 0) {
LCONSOLE_WARN("The negotiation of the checksum algorithm to use with server %s failed (%x/%x), disabling checksums\n",
obd2cli_tgt(imp->imp_obd),
ocd->ocd_cksum_types,
cksum_types_supported_client());
cli->cl_checksum = 0;
cli->cl_supp_cksum_types = OBD_CKSUM_ADLER;
} else {
cli->cl_supp_cksum_types = ocd->ocd_cksum_types;
}
} else {
/* The server does not support OBD_CONNECT_CKSUM.
* Enforce ADLER for backward compatibility*/
cli->cl_supp_cksum_types = OBD_CKSUM_ADLER;
}
cli->cl_cksum_type = cksum_type_select(cli->cl_supp_cksum_types);
if (ocd->ocd_connect_flags & OBD_CONNECT_BRW_SIZE)
cli->cl_max_pages_per_rpc =
min(ocd->ocd_brw_size >> PAGE_CACHE_SHIFT,
cli->cl_max_pages_per_rpc);
else if (imp->imp_connect_op == MDS_CONNECT ||
imp->imp_connect_op == MGS_CONNECT)
cli->cl_max_pages_per_rpc = 1;
/* Reset ns_connect_flags only for initial connect. It might be
* changed in while using FS and if we reset it in reconnect
* this leads to losing user settings done before such as
* disable lru_resize, etc. */
if (old_connect_flags != exp_connect_flags(exp) ||
aa->pcaa_initial_connect) {
CDEBUG(D_HA, "%s: Resetting ns_connect_flags to server flags: %#llx\n",
imp->imp_obd->obd_name, ocd->ocd_connect_flags);
imp->imp_obd->obd_namespace->ns_connect_flags =
ocd->ocd_connect_flags;
imp->imp_obd->obd_namespace->ns_orig_connect_flags =
ocd->ocd_connect_flags;
}
if ((ocd->ocd_connect_flags & OBD_CONNECT_AT) &&
(imp->imp_msg_magic == LUSTRE_MSG_MAGIC_V2))
/* We need a per-message support flag, because
a. we don't know if the incoming connect reply
supports AT or not (in reply_in_callback)
until we unpack it.
b. failovered server means export and flags are gone
(in ptlrpc_send_reply).
Can only be set when we know AT is supported at
both ends */
imp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
else
imp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
if ((ocd->ocd_connect_flags & OBD_CONNECT_FULL20) &&
(imp->imp_msg_magic == LUSTRE_MSG_MAGIC_V2))
imp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
else
imp->imp_msghdr_flags &= ~MSGHDR_CKSUM_INCOMPAT18;
LASSERT((cli->cl_max_pages_per_rpc <= PTLRPC_MAX_BRW_PAGES) &&
(cli->cl_max_pages_per_rpc > 0));
}
out:
imp->imp_connect_tried = 1;
if (rc != 0) {
IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
if (rc == -EACCES) {
/*
* Give up trying to reconnect
* EACCES means client has no permission for connection
*/
imp->imp_obd->obd_no_recov = 1;
ptlrpc_deactivate_import(imp);
}
if (rc == -EPROTO) {
struct obd_connect_data *ocd;
/* reply message might not be ready */
if (request->rq_repmsg == NULL)
return -EPROTO;
ocd = req_capsule_server_get(&request->rq_pill,
&RMF_CONNECT_DATA);
if (ocd &&
(ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
(ocd->ocd_version != LUSTRE_VERSION_CODE)) {
/*
* Actually servers are only supposed to refuse
* connection from liblustre clients, so we
* should never see this from VFS context
*/
LCONSOLE_ERROR_MSG(0x16a, "Server %s version (%d.%d.%d.%d) refused connection from this client with an incompatible version (%s). Client must be recompiled\n",
obd2cli_tgt(imp->imp_obd),
OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
OBD_OCD_VERSION_MINOR(ocd->ocd_version),
OBD_OCD_VERSION_PATCH(ocd->ocd_version),
OBD_OCD_VERSION_FIX(ocd->ocd_version),
LUSTRE_VERSION_STRING);
ptlrpc_deactivate_import(imp);
IMPORT_SET_STATE(imp, LUSTRE_IMP_CLOSED);
}
return -EPROTO;
}
ptlrpc_maybe_ping_import_soon(imp);
CDEBUG(D_HA, "recovery of %s on %s failed (%d)\n",
obd2cli_tgt(imp->imp_obd),
(char *)imp->imp_connection->c_remote_uuid.uuid, rc);
}
wake_up_all(&imp->imp_recovery_waitq);
return rc;
}
/**
* interpret callback for "completed replay" RPCs.
* \see signal_completed_replay
*/
static int completed_replay_interpret(const struct lu_env *env,
struct ptlrpc_request *req,
void *data, int rc)
{
atomic_dec(&req->rq_import->imp_replay_inflight);
if (req->rq_status == 0 &&
!req->rq_import->imp_vbr_failed) {
ptlrpc_import_recovery_state_machine(req->rq_import);
} else {
if (req->rq_import->imp_vbr_failed) {
CDEBUG(D_WARNING,
"%s: version recovery fails, reconnecting\n",
req->rq_import->imp_obd->obd_name);
} else {
CDEBUG(D_HA, "%s: LAST_REPLAY message error: %d, reconnecting\n",
req->rq_import->imp_obd->obd_name,
req->rq_status);
}
ptlrpc_connect_import(req->rq_import);
}
return 0;
}
/**
* Let server know that we have no requests to replay anymore.
* Achieved by just sending a PING request
*/
static int signal_completed_replay(struct obd_import *imp)
{
struct ptlrpc_request *req;
if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_FINISH_REPLAY)))
return 0;
LASSERT(atomic_read(&imp->imp_replay_inflight) == 0);
atomic_inc(&imp->imp_replay_inflight);
req = ptlrpc_request_alloc_pack(imp, &RQF_OBD_PING, LUSTRE_OBD_VERSION,
OBD_PING);
if (req == NULL) {
atomic_dec(&imp->imp_replay_inflight);
return -ENOMEM;
}
ptlrpc_request_set_replen(req);
req->rq_send_state = LUSTRE_IMP_REPLAY_WAIT;
lustre_msg_add_flags(req->rq_reqmsg,
MSG_LOCK_REPLAY_DONE | MSG_REQ_REPLAY_DONE);
if (AT_OFF)
req->rq_timeout *= 3;
req->rq_interpret_reply = completed_replay_interpret;
ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
return 0;
}
/**
* In kernel code all import invalidation happens in its own
* separate thread, so that whatever application happened to encounter
* a problem could still be killed or otherwise continue
*/
static int ptlrpc_invalidate_import_thread(void *data)
{
struct obd_import *imp = data;
unshare_fs_struct();
CDEBUG(D_HA, "thread invalidate import %s to %s@%s\n",
imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd),
imp->imp_connection->c_remote_uuid.uuid);
ptlrpc_invalidate_import(imp);
if (obd_dump_on_eviction) {
CERROR("dump the log upon eviction\n");
libcfs_debug_dumplog();
}
IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
ptlrpc_import_recovery_state_machine(imp);
class_import_put(imp);
return 0;
}
/**
* This is the state machine for client-side recovery on import.
*
* Typically we have two possibly paths. If we came to server and it is not
* in recovery, we just enter IMP_EVICTED state, invalidate our import
* state and reconnect from scratch.
* If we came to server that is in recovery, we enter IMP_REPLAY import state.
* We go through our list of requests to replay and send them to server one by
* one.
* After sending all request from the list we change import state to
* IMP_REPLAY_LOCKS and re-request all the locks we believe we have from server
* and also all the locks we don't yet have and wait for server to grant us.
* After that we send a special "replay completed" request and change import
* state to IMP_REPLAY_WAIT.
* Upon receiving reply to that "replay completed" RPC we enter IMP_RECOVER
* state and resend all requests from sending list.
* After that we promote import to FULL state and send all delayed requests
* and import is fully operational after that.
*
*/
int ptlrpc_import_recovery_state_machine(struct obd_import *imp)
{
int rc = 0;
int inflight;
char *target_start;
int target_len;
if (imp->imp_state == LUSTRE_IMP_EVICTED) {
deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
&target_start, &target_len);
/* Don't care about MGC eviction */
if (strcmp(imp->imp_obd->obd_type->typ_name,
LUSTRE_MGC_NAME) != 0) {
LCONSOLE_ERROR_MSG(0x167, "%s: This client was evicted by %.*s; in progress operations using this service will fail.\n",
imp->imp_obd->obd_name, target_len,
target_start);
}
CDEBUG(D_HA, "evicted from %s@%s; invalidating\n",
obd2cli_tgt(imp->imp_obd),
imp->imp_connection->c_remote_uuid.uuid);
/* reset vbr_failed flag upon eviction */
spin_lock(&imp->imp_lock);
imp->imp_vbr_failed = 0;
spin_unlock(&imp->imp_lock);
{
struct task_struct *task;
/* bug 17802: XXX client_disconnect_export vs connect request
* race. if client will evicted at this time, we start
* invalidate thread without reference to import and import can
* be freed at same time. */
class_import_get(imp);
task = kthread_run(ptlrpc_invalidate_import_thread, imp,
"ll_imp_inval");
if (IS_ERR(task)) {
class_import_put(imp);
CERROR("error starting invalidate thread: %d\n", rc);
rc = PTR_ERR(task);
} else {
rc = 0;
}
return rc;
}
}
if (imp->imp_state == LUSTRE_IMP_REPLAY) {
CDEBUG(D_HA, "replay requested by %s\n",
obd2cli_tgt(imp->imp_obd));
rc = ptlrpc_replay_next(imp, &inflight);
if (inflight == 0 &&
atomic_read(&imp->imp_replay_inflight) == 0) {
IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
rc = ldlm_replay_locks(imp);
if (rc)
goto out;
}
rc = 0;
}
if (imp->imp_state == LUSTRE_IMP_REPLAY_LOCKS) {
if (atomic_read(&imp->imp_replay_inflight) == 0) {
IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_WAIT);
rc = signal_completed_replay(imp);
if (rc)
goto out;
}
}
if (imp->imp_state == LUSTRE_IMP_REPLAY_WAIT) {
if (atomic_read(&imp->imp_replay_inflight) == 0) {
IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
}
}
if (imp->imp_state == LUSTRE_IMP_RECOVER) {
CDEBUG(D_HA, "reconnected to %s@%s\n",
obd2cli_tgt(imp->imp_obd),
imp->imp_connection->c_remote_uuid.uuid);
rc = ptlrpc_resend(imp);
if (rc)
goto out;
IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
ptlrpc_activate_import(imp);
deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
&target_start, &target_len);
LCONSOLE_INFO("%s: Connection restored to %.*s (at %s)\n",
imp->imp_obd->obd_name,
target_len, target_start,
libcfs_nid2str(imp->imp_connection->c_peer.nid));
}
if (imp->imp_state == LUSTRE_IMP_FULL) {
wake_up_all(&imp->imp_recovery_waitq);
ptlrpc_wake_delayed(imp);
}
out:
return rc;
}
int ptlrpc_disconnect_import(struct obd_import *imp, int noclose)
{
struct ptlrpc_request *req;
int rq_opc, rc = 0;
if (imp->imp_obd->obd_force)
goto set_state;
switch (imp->imp_connect_op) {
case OST_CONNECT:
rq_opc = OST_DISCONNECT;
break;
case MDS_CONNECT:
rq_opc = MDS_DISCONNECT;
break;
case MGS_CONNECT:
rq_opc = MGS_DISCONNECT;
break;
default:
rc = -EINVAL;
CERROR("%s: don't know how to disconnect from %s (connect_op %d): rc = %d\n",
imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd),
imp->imp_connect_op, rc);
return rc;
}
if (ptlrpc_import_in_recovery(imp)) {
struct l_wait_info lwi;
long timeout;
if (AT_OFF) {
if (imp->imp_server_timeout)
timeout = cfs_time_seconds(obd_timeout / 2);
else
timeout = cfs_time_seconds(obd_timeout);
} else {
int idx = import_at_get_index(imp,
imp->imp_client->cli_request_portal);
timeout = cfs_time_seconds(
at_get(&imp->imp_at.iat_service_estimate[idx]));
}
lwi = LWI_TIMEOUT_INTR(cfs_timeout_cap(timeout),
back_to_sleep, LWI_ON_SIGNAL_NOOP, NULL);
rc = l_wait_event(imp->imp_recovery_waitq,
!ptlrpc_import_in_recovery(imp), &lwi);
}
spin_lock(&imp->imp_lock);
if (imp->imp_state != LUSTRE_IMP_FULL)
goto out;
spin_unlock(&imp->imp_lock);
req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_DISCONNECT,
LUSTRE_OBD_VERSION, rq_opc);
if (req) {
/* We are disconnecting, do not retry a failed DISCONNECT rpc if
* it fails. We can get through the above with a down server
* if the client doesn't know the server is gone yet. */
req->rq_no_resend = 1;
/* We want client umounts to happen quickly, no matter the
server state... */
req->rq_timeout = min_t(int, req->rq_timeout,
INITIAL_CONNECT_TIMEOUT);
IMPORT_SET_STATE(imp, LUSTRE_IMP_CONNECTING);
req->rq_send_state = LUSTRE_IMP_CONNECTING;
ptlrpc_request_set_replen(req);
rc = ptlrpc_queue_wait(req);
ptlrpc_req_finished(req);
}
set_state:
spin_lock(&imp->imp_lock);
out:
if (noclose)
IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
else
IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CLOSED);
memset(&imp->imp_remote_handle, 0, sizeof(imp->imp_remote_handle));
spin_unlock(&imp->imp_lock);
if (rc == -ETIMEDOUT || rc == -ENOTCONN || rc == -ESHUTDOWN)
rc = 0;
return rc;
}
EXPORT_SYMBOL(ptlrpc_disconnect_import);
void ptlrpc_cleanup_imp(struct obd_import *imp)
{
spin_lock(&imp->imp_lock);
IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CLOSED);
imp->imp_generation++;
spin_unlock(&imp->imp_lock);
ptlrpc_abort_inflight(imp);
}
EXPORT_SYMBOL(ptlrpc_cleanup_imp);
/* Adaptive Timeout utils */
extern unsigned int at_min, at_max, at_history;
/* Bin into timeslices using AT_BINS bins.
This gives us a max of the last binlimit*AT_BINS secs without the storage,
but still smoothing out a return to normalcy from a slow response.
(E.g. remember the maximum latency in each minute of the last 4 minutes.) */
int at_measured(struct adaptive_timeout *at, unsigned int val)
{
unsigned int old = at->at_current;
time_t now = get_seconds();
time_t binlimit = max_t(time_t, at_history / AT_BINS, 1);
LASSERT(at);
CDEBUG(D_OTHER, "add %u to %p time=%lu v=%u (%u %u %u %u)\n",
val, at, now - at->at_binstart, at->at_current,
at->at_hist[0], at->at_hist[1], at->at_hist[2], at->at_hist[3]);
if (val == 0)
/* 0's don't count, because we never want our timeout to
drop to 0, and because 0 could mean an error */
return 0;
spin_lock(&at->at_lock);
if (unlikely(at->at_binstart == 0)) {
/* Special case to remove default from history */
at->at_current = val;
at->at_worst_ever = val;
at->at_worst_time = now;
at->at_hist[0] = val;
at->at_binstart = now;
} else if (now - at->at_binstart < binlimit) {
/* in bin 0 */
at->at_hist[0] = max(val, at->at_hist[0]);
at->at_current = max(val, at->at_current);
} else {
int i, shift;
unsigned int maxv = val;
/* move bins over */
shift = (now - at->at_binstart) / binlimit;
LASSERT(shift > 0);
for (i = AT_BINS - 1; i >= 0; i--) {
if (i >= shift) {
at->at_hist[i] = at->at_hist[i - shift];
maxv = max(maxv, at->at_hist[i]);
} else {
at->at_hist[i] = 0;
}
}
at->at_hist[0] = val;
at->at_current = maxv;
at->at_binstart += shift * binlimit;
}
if (at->at_current > at->at_worst_ever) {
at->at_worst_ever = at->at_current;
at->at_worst_time = now;
}
if (at->at_flags & AT_FLG_NOHIST)
/* Only keep last reported val; keeping the rest of the history
for proc only */
at->at_current = val;
if (at_max > 0)
at->at_current = min(at->at_current, at_max);
at->at_current = max(at->at_current, at_min);
if (at->at_current != old)
CDEBUG(D_OTHER, "AT %p change: old=%u new=%u delta=%d (val=%u) hist %u %u %u %u\n",
at,
old, at->at_current, at->at_current - old, val,
at->at_hist[0], at->at_hist[1], at->at_hist[2],
at->at_hist[3]);
/* if we changed, report the old value */
old = (at->at_current != old) ? old : 0;
spin_unlock(&at->at_lock);
return old;
}
/* Find the imp_at index for a given portal; assign if space available */
int import_at_get_index(struct obd_import *imp, int portal)
{
struct imp_at *at = &imp->imp_at;
int i;
for (i = 0; i < IMP_AT_MAX_PORTALS; i++) {
if (at->iat_portal[i] == portal)
return i;
if (at->iat_portal[i] == 0)
/* unused */
break;
}
/* Not found in list, add it under a lock */
spin_lock(&imp->imp_lock);
/* Check unused under lock */
for (; i < IMP_AT_MAX_PORTALS; i++) {
if (at->iat_portal[i] == portal)
goto out;
if (at->iat_portal[i] == 0)
/* unused */
break;
}
/* Not enough portals? */
LASSERT(i < IMP_AT_MAX_PORTALS);
at->iat_portal[i] = portal;
out:
spin_unlock(&imp->imp_lock);
return i;
}