Viewing: import.c
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2003, 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/fs_struct.h>
#include <linux/kthread.h>
#include <linux/delay.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_cksum.h>
#include <obd_class.h>
#include "ptlrpc_internal.h"
struct ptlrpc_connect_async_args {
__u64 pcaa_peer_committed;
int pcaa_initial_connect;
};
/*
* Updates import @imp current state to provided @state value Helper function.
*/
static void import_set_state_nolock(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;
break;
}
/* A CLOSED import should remain so. */
if (imp->imp_state == LUSTRE_IMP_CLOSED)
return;
if (imp->imp_state != LUSTRE_IMP_NEW) {
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));
}
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 =
ktime_get_real_seconds();
imp->imp_state_hist_idx = (imp->imp_state_hist_idx + 1) %
IMP_STATE_HIST_LEN;
}
static void import_set_state(struct obd_import *imp,
enum lustre_imp_state new_state)
{
spin_lock(&imp->imp_lock);
import_set_state_nolock(imp, new_state);
spin_unlock(&imp->imp_lock);
}
void ptlrpc_import_enter_resend(struct obd_import *imp)
{
import_set_state(imp, LUSTRE_IMP_RECOVER);
}
EXPORT_SYMBOL(ptlrpc_import_enter_resend);
static int ptlrpc_connect_interpret(const struct lu_env *env,
struct ptlrpc_request *request,
void *args, 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);
/* Must be called with imp_lock held! */
static void ptlrpc_deactivate_import_nolock(struct obd_import *imp)
{
ENTRY;
assert_spin_locked(&imp->imp_lock);
CDEBUG(D_HA, "setting import %s INVALID\n", obd2cli_tgt(imp->imp_obd));
smp_mb__before_atomic();
set_bit(IMPF_INVALID, imp->imp_flags);
imp->imp_generation++;
ptlrpc_abort_inflight(imp);
EXIT;
}
/**
* ptlrpc_set_import_discon() - Set import disconnected
* @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.
* @invalid: set import invalid flag
*
* Returns %true if import was FULL, %false if import was already not
* connected.
*/
int ptlrpc_set_import_discon(struct obd_import *imp,
__u32 conn_cnt, bool invalid)
{
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;
bool inact = false;
deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
&target_start, &target_len);
import_set_state_nolock(imp, LUSTRE_IMP_DISCON);
if (test_bit(IMPF_REPLAYABLE, imp->imp_flags)) {
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,
obd_import_nid2str(imp));
} else {
LCONSOLE_ERROR("%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,
obd_import_nid2str(imp));
if (invalid) {
CDEBUG(D_HA,
"import %s@%s for %s not replayable, auto-deactivating\n",
obd2cli_tgt(imp->imp_obd),
libcfs_nidstr(&imp->imp_connection->c_peer.nid),
imp->imp_obd->obd_name);
ptlrpc_deactivate_import_nolock(imp);
inact = true;
}
}
spin_unlock(&imp->imp_lock);
if (obd_dump_on_timeout)
libcfs_debug_dumplog();
obd_import_event(imp->imp_obd, imp, IMP_EVENT_DISCON);
if (inact)
obd_import_event(imp->imp_obd, imp, IMP_EVENT_INACTIVE);
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;
}
/*
* 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_import_nolock(imp);
spin_unlock(&imp->imp_lock);
obd_import_event(imp->imp_obd, imp, IMP_EVENT_INACTIVE);
}
EXPORT_SYMBOL(ptlrpc_deactivate_import);
static time64_t ptlrpc_inflight_deadline(struct ptlrpc_request *req,
time64_t now)
{
time64_t 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 time64_t ptlrpc_inflight_timeout(struct obd_import *imp)
{
time64_t now = ktime_get_real_seconds();
struct ptlrpc_request *req;
time64_t timeout = 0;
spin_lock(&imp->imp_lock);
list_for_each_entry(req, &imp->imp_sending_list, rq_list)
timeout = max(ptlrpc_inflight_deadline(req, now), timeout);
spin_unlock(&imp->imp_lock);
return timeout;
}
/**
* ptlrpc_invalidate_import() - Invalidate import
* @imp: client connection to server to be invalidate
*
* 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 ptlrpc_request *req;
time64_t timeout;
int rc;
atomic_inc(&imp->imp_inval_count);
if (!test_bit(IMPF_INVALID, imp->imp_flags) ||
test_bit(OBDF_NO_RECOV, imp->imp_obd->obd_flags))
ptlrpc_deactivate_import(imp);
if (CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CONNECT_RACE)) {
CFS_RACE(OBD_FAIL_PTLRPC_CONNECT_RACE);
msleep(10 * MSEC_PER_SEC);
}
CFS_FAIL_TIMEOUT(OBD_FAIL_MGS_CONNECT_NET, 3 * cfs_fail_val / 2);
LASSERT(test_bit(IMPF_INVALID, imp->imp_flags));
/* 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 {
long timeout_jiffies;
/* Calculate max timeout for waiting on rpcs to error
* out. Use obd_timeout if calculated value is smaller
* than it.
*/
if (!CFS_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK)) {
timeout = ptlrpc_inflight_timeout(imp);
timeout += div_u64(timeout, 3);
if (timeout == 0)
timeout = obd_timeout;
} else {
/* decrease the interval to increase race condition */
timeout = 1;
}
CDEBUG(D_RPCTRACE, "Sleeping %llds 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.
*/
timeout_jiffies = max_t(long, cfs_time_seconds(timeout), 1);
rc = wait_event_idle_timeout(
imp->imp_recovery_waitq,
(atomic_read(&imp->imp_inflight) == 0),
timeout_jiffies);
if (rc == 0) {
const char *cli_tgt = obd2cli_tgt(imp->imp_obd);
CERROR("%s: timeout waiting for callback (%d != 0)\n",
cli_tgt, 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). 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 = 1;
} else {
list_for_each_entry(req, &imp->imp_sending_list,
rq_list) {
DEBUG_REQ(D_ERROR, req,
"still on sending list");
}
list_for_each_entry(req, &imp->imp_delayed_list,
rq_list) {
DEBUG_REQ(D_ERROR, req,
"still on delayed list");
}
CERROR("%s: Unregistering RPCs found (%d). Network is sluggish? Waiting for them to error out.\n",
cli_tgt,
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(&imp->imp_recovery_waitq);
}
EXPORT_SYMBOL(ptlrpc_invalidate_import);
/* unset imp_invalid */
void ptlrpc_activate_import(struct obd_import *imp, bool set_state_full)
{
struct obd_device *obd = imp->imp_obd;
spin_lock(&imp->imp_lock);
if (test_bit(IMPF_DEACTIVE, imp->imp_flags)) {
LASSERT(imp->imp_state != LUSTRE_IMP_FULL);
if (imp->imp_state != LUSTRE_IMP_DISCON)
import_set_state_nolock(imp, LUSTRE_IMP_DISCON);
spin_unlock(&imp->imp_lock);
return;
}
if (set_state_full)
import_set_state_nolock(imp, LUSTRE_IMP_FULL);
clear_bit(IMPF_INVALID, imp->imp_flags);
smp_mb__after_atomic();
spin_unlock(&imp->imp_lock);
obd_import_event(obd, imp, IMP_EVENT_ACTIVE);
}
EXPORT_SYMBOL(ptlrpc_activate_import);
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));
set_bit(IMPF_FORCE_VERIFY, imp->imp_flags);
smp_mb__after_atomic();
if (imp->imp_state != LUSTRE_IMP_CONNECTING)
ptlrpc_pinger_wake_up();
}
EXPORT_SYMBOL(ptlrpc_pinger_force);
void ptlrpc_fail_import(struct obd_import *imp, __u32 conn_cnt)
{
ENTRY;
LASSERT(!test_bit(IMPF_DLM_FAKE, imp->imp_flags));
if (ptlrpc_set_import_discon(imp, conn_cnt, true))
ptlrpc_pinger_force(imp);
EXIT;
}
int ptlrpc_reconnect_import(struct obd_import *imp)
{
int rc = 0;
ENTRY;
ptlrpc_set_import_discon(imp, 0, true);
/* Force a new connect attempt */
ptlrpc_invalidate_import(imp);
/* Wait for all invalidate calls to finish */
if (atomic_read(&imp->imp_inval_count) > 0) {
int rc;
rc = l_wait_event_abortable(
imp->imp_recovery_waitq,
(atomic_read(&imp->imp_inval_count) == 0));
if (rc)
CERROR("Interrupted, inval=%d\n",
atomic_read(&imp->imp_inval_count));
}
/* Allow reconnect attempts */
clear_bit(OBDF_NO_RECOV, imp->imp_obd->obd_flags);
smp_mb__after_atomic();
imp->imp_remote_handle.cookie = 0;
/* Attempt a new connect */
rc = ptlrpc_recover_import(imp, NULL, 0);
RETURN(rc);
}
EXPORT_SYMBOL(ptlrpc_reconnect_import);
/*
* Connection on import @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, *lru_conn = NULL;
struct obd_export *dlmexp;
char *target_start;
int target_len;
bool tried_all = true;
int rc = 0;
ENTRY;
spin_lock(&imp->imp_lock);
if (list_empty(&imp->imp_conn_list)) {
rc = -EINVAL;
CERROR("%s: no connections available: rc = %d\n",
imp->imp_obd->obd_name, rc);
GOTO(out_unlock, rc);
}
/* if forced, simply choose the current one */
if (test_bit(IMPF_FORCE_RECONNECT, imp->imp_flags)) {
LASSERT(imp->imp_conn_current);
imp_conn = imp->imp_conn_current;
tried_all = false;
goto connect;
}
list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
int old_status = conn->oic_uptodate;
CDEBUG(D_HA, "%s: connect to NID %s last attempt %lld\n",
imp->imp_obd->obd_name,
libcfs_nidstr(&conn->oic_conn->c_peer.nid),
conn->oic_last_attempt);
conn->oic_uptodate =
LNetPeerDiscovered(&conn->oic_conn->c_peer.nid);
/* connection status is changed to good state, try it like
* this is first attempt
*/
if (old_status <= 0 && conn->oic_uptodate > 0) {
lru_conn = imp_conn = conn;
tried_all = false;
break;
}
/* LNET ping failed, skip peer completely */
if (conn->oic_uptodate == -EHOSTUNREACH) {
CDEBUG(D_HA, "%s: skip NID %s as unreachable\n",
imp->imp_obd->obd_name,
libcfs_nidstr(&conn->oic_conn->c_peer.nid));
continue;
}
/* track least recently used conn for fallback */
if (!lru_conn ||
lru_conn->oic_last_attempt > conn->oic_last_attempt)
lru_conn = conn;
/* If we have not tried this connection since
* the last successful attempt or ever (0 value)
*/
if (conn->oic_last_attempt <= imp->imp_last_success_conn) {
tried_all = false;
if (conn->oic_uptodate > 0) {
imp_conn = conn;
break;
}
CDEBUG(D_HA, "%s: skip NID %s as not ready: rc = %d\n",
imp->imp_obd->obd_name,
libcfs_nidstr(&conn->oic_conn->c_peer.nid),
conn->oic_uptodate);
}
}
/* all connections are unreachable ATM, get just first in list */
if (!lru_conn) {
tried_all = false;
lru_conn = list_entry(imp->imp_conn_list.next,
struct obd_import_conn, oic_item);
}
/* no ready connections or all are tried in this round */
if (!imp_conn)
imp_conn = lru_conn;
LASSERT(imp_conn->oic_conn);
if (!tried_all) {
struct adaptive_timeout *at = &imp->imp_at.iat_net_latency;
timeout_t timeout = obd_at_get(imp->imp_obd, at);
/* make it quick at first round */
if (timeout > CONNECTION_SWITCH_MIN)
at_reset(at, CONNECTION_SWITCH_MIN);
} else if (imp->imp_conn_list.next == &imp_conn->oic_item) {
struct adaptive_timeout *at = &imp->imp_at.iat_net_latency;
timeout_t timeout = obd_at_get(imp->imp_obd, at);
/* If we've tried everything, and we're back to the beginning
* of the list, increase 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 (timeout < CONNECTION_SWITCH_MAX) {
obd_at_measure(imp->imp_obd, at,
timeout + CONNECTION_SWITCH_INC);
if (timeout > 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, timeout);
}
connect:
imp_conn->oic_last_attempt = ktime_get_seconds();
imp_conn->oic_attempts++;
/* switch connection, don't mind if it's same as the current one */
ptlrpc_connection_put(imp->imp_connection);
imp->imp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
dlmexp = class_conn2export(&imp->imp_dlm_handle);
if (!dlmexp)
GOTO(out_unlock, rc = -EINVAL);
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_nidstr(&imp_conn->oic_conn->c_peer.nid));
}
imp->imp_conn_current = imp_conn;
}
/* The below message is checked in conf-sanity.sh test_35[ab] */
CDEBUG(D_HA, "%s: import %p using connection %s/%s\n",
imp->imp_obd->obd_name, imp, imp_conn->oic_uuid.uuid,
libcfs_nidstr(&imp_conn->oic_conn->c_peer.nid));
out_unlock:
spin_unlock(&imp->imp_lock);
RETURN(rc);
}
/*
* must be called under imp_lock
*/
static int ptlrpc_first_transno(struct obd_import *imp, __u64 *transno)
{
struct ptlrpc_request *req;
/* The requests in committed_list always have smaller transnos than
* the requests in replay_list
*/
if (!list_empty(&imp->imp_committed_list)) {
req = list_first_entry(&imp->imp_committed_list,
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)) {
req = list_first_entry(&imp->imp_replay_list,
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;
}
int ptlrpc_connect_import(struct obd_import *imp)
{
spin_lock(&imp->imp_lock);
return ptlrpc_connect_import_locked(imp);
}
/**
* ptlrpc_connect_import_locked() - Attempt to (re)connect import
* @imp:
*
* Attempt to (re)connect import @imp. This includes all preparations,
* initializing CONNECT RPC request and passing it to ptlrpcd for
* actual sending.
*
* Assumes imp->imp_lock is held, and releases it.
*
* Returns 0 on success or error code.
*/
int ptlrpc_connect_import_locked(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;
struct sptlrpc_sepol *sepol;
struct obd_connect_data ocd;
char *bufs[] = { NULL,
obd2cli_tgt(imp->imp_obd),
obd->obd_uuid.uuid,
(char *)&imp->imp_dlm_handle,
(char *)&ocd,
NULL };
struct ptlrpc_connect_async_args *aa;
int rc;
ENTRY;
assert_spin_locked(&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 ||
imp->imp_state == LUSTRE_IMP_EVICTED ||
test_bit(IMPF_CONNECTED, imp->imp_flags)) {
spin_unlock(&imp->imp_lock);
CERROR("already connecting\n");
RETURN(-EALREADY);
}
import_set_state_nolock(imp, LUSTRE_IMP_CONNECTING);
imp->imp_conn_cnt++;
clear_bit(IMPF_RESEND_REPLAY, imp->imp_flags);
smp_mb__after_atomic();
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);
rc = sptlrpc_import_sec_adapt(imp, NULL, NULL);
if (rc)
GOTO(out, rc);
/* Reset connect flags to the originally requested flags, in case
* the server is updated on-the-fly we will get the new features.
*/
ocd = imp->imp_connect_data;
ocd.ocd_connect_flags = imp->imp_connect_flags_orig;
ocd.ocd_connect_flags2 = imp->imp_connect_flags2_orig;
/* Reset ocd_version each time so the server knows the exact versions */
ocd.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, &ocd, NULL);
if (rc)
GOTO(out, rc);
request = ptlrpc_request_alloc(imp, &RQF_MDS_CONNECT);
if (request == NULL)
GOTO(out, rc = -ENOMEM);
/* get SELinux policy info if any */
sepol = sptlrpc_sepol_get(request);
if (IS_ERR(sepol)) {
ptlrpc_request_free(request);
GOTO(out, rc = PTR_ERR(sepol));
}
bufs[5] = sepol->ssp_sepol;
req_capsule_set_size(&request->rq_pill, &RMF_SELINUX_POL, RCL_CLIENT,
sptlrpc_sepol_size(sepol));
rc = ptlrpc_request_bufs_pack(request, LUSTRE_OBD_VERSION,
imp->imp_connect_op, bufs, NULL);
sptlrpc_sepol_put(sepol);
if (rc) {
ptlrpc_request_free(request);
GOTO(out, rc);
}
/* 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_timeout(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);
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;
aa = ptlrpc_req_async_args(aa, request);
memset(aa, 0, sizeof(*aa));
aa->pcaa_peer_committed = committed_before_reconnect;
aa->pcaa_initial_connect = initial_connect;
if (aa->pcaa_initial_connect) {
set_bit(IMPF_REPLAYABLE, imp->imp_flags);
smp_mb__after_atomic();
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);
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;
force_verify = test_bit(IMPF_FORCE_VERIFY, imp->imp_flags);
if (force_verify)
ptlrpc_pinger_wake_up();
}
static int ptlrpc_busy_reconnect(int rc)
{
return (rc == -EBUSY) || (rc == -EAGAIN);
}
static int ptlrpc_connect_set_flags(struct obd_import *imp,
struct obd_connect_data *ocd,
__u64 old_connect_flags,
struct obd_export *exp, int init_connect)
{
static bool warned;
struct client_obd *cli = &imp->imp_obd->u.cli;
spin_lock(&imp->imp_lock);
list_move(&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 (!warned && (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)) {
/* few compiler do not like #ifdef in middle of macro argument*/
const char *older = "older than client. Consider upgrading server"
;
const char *newer = "newer than client. Consider upgrading client"
;
LCONSOLE_WARN("Client version (%s). Server %s version (%d.%d.%d.%d) is much %s\n",
LUSTRE_VERSION_STRING,
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);
warned = true;
}
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 &
obd_cksum_types_supported_client()) == 0) {
LCONSOLE_ERROR("The negotiation of the checksum alogrithm to use with server %s failed (%x/%x)\n",
obd2cli_tgt(imp->imp_obd),
ocd->ocd_cksum_types,
obd_cksum_types_supported_client());
return -EPROTO;
}
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 = obd_cksum_type_select(imp->imp_obd->obd_name,
cli->cl_supp_cksum_types,
cli->cl_preferred_cksum_type);
if (ocd->ocd_connect_flags & OBD_CONNECT_BRW_SIZE) {
cli->cl_max_pages_per_rpc_write =
min(ocd->ocd_brw_size >> PAGE_SHIFT,
cli->cl_max_pages_per_rpc_write);
cli->cl_max_pages_per_rpc_read =
min(ocd->ocd_brw_size >> PAGE_SHIFT,
cli->cl_max_pages_per_rpc_read);
} else if (imp->imp_connect_op == MDS_CONNECT ||
imp->imp_connect_op == MGS_CONNECT) {
cli->cl_max_pages_per_rpc_write = 1;
cli->cl_max_pages_per_rpc_read = 1;
}
LASSERT((cli->cl_max_pages_per_rpc_write <= PTLRPC_MAX_BRW_PAGES) &&
(cli->cl_max_pages_per_rpc_write > 0));
LASSERT((cli->cl_max_pages_per_rpc_read <= PTLRPC_MAX_BRW_PAGES) &&
(cli->cl_max_pages_per_rpc_read > 0));
client_adjust_max_dirty(cli);
/* Update client max modify RPCs in flight with value returned
* by the server
*/
if (ocd->ocd_connect_flags & OBD_CONNECT_MULTIMODRPCS)
cli->cl_max_mod_rpcs_in_flight = min(
cli->cl_max_mod_rpcs_in_flight,
ocd->ocd_maxmodrpcs);
else
cli->cl_max_mod_rpcs_in_flight = 1;
/* Reset ns_connect_flags only for initial connect. Might be changed
* 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) || init_connect) {
struct ldlm_namespace *ns = imp->imp_obd->obd_namespace;
__u64 changed_flags;
changed_flags =
ns->ns_connect_flags ^ ns->ns_orig_connect_flags;
CDEBUG(D_HA, "%s: Resetting ns_connect_flags to server flags: %#llx\n",
imp->imp_obd->obd_name,
ocd->ocd_connect_flags);
spin_lock(&ns->ns_lock);
ns->ns_connect_flags = (ns->ns_connect_flags & changed_flags) |
(ocd->ocd_connect_flags & ~changed_flags);
ns->ns_orig_connect_flags = ocd->ocd_connect_flags;
/* If lru_size has been set by param set configuration,
* then it should honor param set.
* if ns_max_unused is 0, then it means the param set actually
* set lru_size to 0, i.e. LRU_SIZE should be enabled or set by
* connection result; otherwise it should disable lru_resize.
* see lru_size_store().
*/
if (ns_connect_lru_resize(ns) &&
test_bit(LDLM_NS_LRU_SIZE_SET_BEFORE_CONN, ns->ns_flags) &&
ns->ns_max_unused != 0)
ns->ns_connect_flags &= ~OBD_CONNECT_LRU_RESIZE;
clear_bit(LDLM_NS_LRU_SIZE_SET_BEFORE_CONN, ns->ns_flags);
spin_unlock(&ns->ns_lock);
}
if (ocd->ocd_connect_flags & OBD_CONNECT_AT)
/* 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;
imp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
return 0;
}
/*
* Add all replay requests back to unreplied list before start replay,
* so that we can make sure the known replied XID is always increased
* only even if when replaying requests.
*/
static void ptlrpc_prepare_replay(struct obd_import *imp)
{
struct ptlrpc_request *req;
if (imp->imp_state != LUSTRE_IMP_REPLAY ||
test_bit(IMPF_RESEND_REPLAY, imp->imp_flags))
return;
/* If the server was restart during repaly, the requests may
* have been added to the unreplied list in former replay.
*/
spin_lock(&imp->imp_lock);
list_for_each_entry(req, &imp->imp_committed_list, rq_replay_list) {
if (list_empty(&req->rq_unreplied_list))
ptlrpc_add_unreplied(req);
}
list_for_each_entry(req, &imp->imp_replay_list, rq_replay_list) {
if (list_empty(&req->rq_unreplied_list))
ptlrpc_add_unreplied(req);
}
imp->imp_known_replied_xid = ptlrpc_known_replied_xid(imp);
spin_unlock(&imp->imp_lock);
}
/**
* ptlrpc_connect_interpret() - interpret_reply callback for connect RPCs.
* @env: execution context
* @request: PTLRPC request (server response)
* @data: thread specific data
* @rc: error code
*
* 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.
*
* Return:
* * %0 on success
* * %negative on failure
*/
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 lustre_handle old_hdl;
__u64 old_connect_flags;
timeout_t service_timeout;
int msg_flags;
struct obd_connect_data *ocd;
struct obd_export *exp = NULL;
int ret;
ENTRY;
spin_lock(&imp->imp_lock);
if (imp->imp_state == LUSTRE_IMP_CLOSED) {
set_bit(IMPF_CONNECT_TRIED, imp->imp_flags);
smp_mb__after_atomic();
spin_unlock(&imp->imp_lock);
RETURN(0);
}
imp->imp_connect_error = rc;
if (rc) {
struct ptlrpc_request *free_req;
struct ptlrpc_request *tmp;
/* abort all delayed requests initiated connection */
list_for_each_entry_safe(free_req, tmp, &imp->imp_delayed_list,
rq_list) {
spin_lock(&free_req->rq_lock);
if (free_req->rq_no_resend) {
free_req->rq_err = 1;
free_req->rq_status = -EIO;
ptlrpc_client_wake_req(free_req);
}
spin_unlock(&free_req->rq_lock);
}
/* if this reconnect to busy export - not need select new target
* for connecting
*/
if (ptlrpc_busy_reconnect(rc))
set_bit(IMPF_FORCE_RECONNECT, imp->imp_flags);
else
clear_bit(IMPF_FORCE_RECONNECT, imp->imp_flags);
spin_unlock(&imp->imp_lock);
GOTO(out, rc);
}
/* LU-7558: indicate that we are interpretting connect reply,
* pltrpc_connect_import() will not try to reconnect until
* interpret will finish.
*/
set_bit(IMPF_CONNECTED, imp->imp_flags);
spin_unlock(&imp->imp_lock);
LASSERT(imp->imp_conn_current);
imp->imp_conn_current->oic_replied++;
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, rc);
}
spin_lock(&imp->imp_lock);
/* All imports are pingable */
set_bit(IMPF_PINGABLE, imp->imp_flags);
clear_bit(IMPF_FORCE_RECONNECT, imp->imp_flags);
clear_bit(IMPF_FORCE_VERIFY, imp->imp_flags);
smp_mb__after_atomic();
imp->imp_setup_time = ktime_get_seconds();
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);
if (!exp) {
/* Could happen if export is cleaned during connect attempt */
CERROR("%s: missing export after connect\n",
imp->imp_obd->obd_name);
GOTO(out, rc = -ENODEV);
}
/* 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 grant requested subset of flags: asked=%#llx granted=%#llx\n",
imp->imp_obd->obd_name, imp->imp_connect_flags_orig,
ocd->ocd_connect_flags);
GOTO(out, rc = -EPROTO);
}
if ((ocd->ocd_connect_flags2 & imp->imp_connect_flags2_orig) !=
ocd->ocd_connect_flags2) {
CERROR("%s: Server didn't grant requested subset of flags2: asked=%#llx granted=%#llx\n",
imp->imp_obd->obd_name, imp->imp_connect_flags2_orig,
ocd->ocd_connect_flags2);
GOTO(out, rc = -EPROTO);
}
if (!(imp->imp_connect_flags_orig & OBD_CONNECT_LIGHTWEIGHT) &&
(imp->imp_connect_flags_orig & OBD_CONNECT_MDS_MDS) &&
(imp->imp_connect_flags_orig & OBD_CONNECT_FID) &&
(ocd->ocd_connect_flags & OBD_CONNECT_VERSION)) {
__u32 major = OBD_OCD_VERSION_MAJOR(ocd->ocd_version);
__u32 minor = OBD_OCD_VERSION_MINOR(ocd->ocd_version);
__u32 patch = OBD_OCD_VERSION_PATCH(ocd->ocd_version);
/* We do not support the MDT-MDT interoperations with
* different version MDT because of protocol changes.
*/
if (unlikely(major != LUSTRE_MAJOR ||
minor != LUSTRE_MINOR ||
abs(patch - LUSTRE_PATCH) > 3)) {
LCONSOLE_WARN("%s: import %p (%u.%u.%u.%u) tried the connection to different version MDT (%d.%d.%d.%d) %s\n",
imp->imp_obd->obd_name, imp, LUSTRE_MAJOR,
LUSTRE_MINOR, LUSTRE_PATCH, LUSTRE_FIX,
major, minor, patch,
OBD_OCD_VERSION_FIX(ocd->ocd_version),
libcfs_nidstr(&imp->imp_connection->c_peer.nid));
GOTO(out, rc = -EPROTO);
}
}
old_connect_flags = exp_connect_flags(exp);
exp->exp_connect_data = *ocd;
imp->imp_obd->obd_self_export->exp_connect_data = *ocd;
/* The net statistics after (re-)connect is not valid anymore,
* because may reflect other routing, etc.
*/
service_timeout = lustre_msg_get_service_timeout(request->rq_repmsg);
at_reinit(&imp->imp_at.iat_net_latency, 0, 0);
ptlrpc_at_adj_net_latency(request, service_timeout);
/* Import flags should be updated before waking import at FULL state */
rc = ptlrpc_connect_set_flags(imp, ocd, old_connect_flags, exp,
aa->pcaa_initial_connect);
class_export_put(exp);
exp = NULL;
if (rc != 0)
GOTO(out, rc);
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) {
set_bit(IMPF_REPLAYABLE, imp->imp_flags);
CDEBUG(D_HA, "connected to replayable target: %s\n",
obd2cli_tgt(imp->imp_obd));
} else {
clear_bit(IMPF_REPLAYABLE, imp->imp_flags);
}
/* if applies, adjust the imp->imp_msg_magic here
* according to reply flags
*/
imp->imp_remote_handle =
*lustre_msg_get_handle(request->rq_repmsg);
set_bit(IMPF_NO_CACHED_DATA, imp->imp_flags);
smp_mb__after_atomic();
/* 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_nolock(imp, LUSTRE_IMP_REPLAY_LOCKS);
spin_unlock(&imp->imp_lock);
} else {
spin_unlock(&imp->imp_lock);
ptlrpc_activate_import(imp, true);
}
GOTO(finish, rc = 0);
}
/* 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),
libcfs_nidstr(&imp->imp_connection->c_peer.nid),
imp->imp_dlm_handle.cookie);
GOTO(out, rc = -ENOTCONN);
}
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_LIMIT(level,
"%s@%s changed server handle from %#llx to %#llx but is still in recovery\n",
obd2cli_tgt(imp->imp_obd),
libcfs_nidstr(&imp->imp_connection->c_peer.nid),
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),
libcfs_nidstr(&imp->imp_connection->c_peer.nid),
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);
GOTO(finish, rc = 0);
}
} else {
CDEBUG(D_HA, "reconnected to %s@%s after partition\n",
obd2cli_tgt(imp->imp_obd),
libcfs_nidstr(&imp->imp_connection->c_peer.nid));
}
if (test_bit(IMPF_INVALID, imp->imp_flags)) {
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));
set_bit(IMPF_RESEND_REPLAY, imp->imp_flags);
smp_mb__after_atomic();
import_set_state(imp, imp->imp_replay_state);
} else {
import_set_state(imp, LUSTRE_IMP_RECOVER);
}
} else if ((MSG_CONNECT_RECOVERING & msg_flags) &&
!test_bit(IMPF_INVALID, imp->imp_flags)) {
LASSERT(test_bit(IMPF_REPLAYABLE, imp->imp_flags));
imp->imp_remote_handle =
*lustre_msg_get_handle(request->rq_repmsg);
imp->imp_last_replay_transno = 0;
imp->imp_replay_cursor = &imp->imp_committed_list;
import_set_state(imp, LUSTRE_IMP_REPLAY);
} else if ((ocd->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) != 0 &&
!test_bit(IMPF_INVALID, imp->imp_flags)) {
obd_import_event(imp->imp_obd, imp, IMP_EVENT_INVALIDATE);
/* The below message is checked in recovery-small.sh test_106 */
DEBUG_REQ(D_HA, request, "%s: lwp recover",
imp->imp_obd->obd_name);
imp->imp_remote_handle =
*lustre_msg_get_handle(request->rq_repmsg);
import_set_state(imp, LUSTRE_IMP_RECOVER);
} else {
imp->imp_remote_handle =
*lustre_msg_get_handle(request->rq_repmsg);
if (!test_bit(IMPF_NO_CACHED_DATA, imp->imp_flags)) {
DEBUG_REQ(D_HA, request,
"%s: evicting (reconnect/recover flags not set: %x)",
imp->imp_obd->obd_name, msg_flags);
import_set_state(imp, LUSTRE_IMP_EVICTED);
} else {
ptlrpc_activate_import(imp, true);
}
}
/* Sanity checks for a reconnected import. */
if (!test_bit(IMPF_REPLAYABLE, imp->imp_flags) !=
!(msg_flags & MSG_CONNECT_REPLAYABLE))
CERROR("IMPF_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) {
static bool printed;
/* The below message is checked in recovery-small.sh test_54 */
CERROR("%s: went back in time (transno %lld was previously committed, server now claims %lld)!\n",
obd2cli_tgt(imp->imp_obd), aa->pcaa_peer_committed,
lustre_msg_get_last_committed(request->rq_repmsg));
if (!printed) {
CERROR("For further information, see http://doc.lustre.org/lustre_manual.xhtml#went_back_in_time\n");
printed = true;
}
}
finish:
ptlrpc_prepare_replay(imp);
rc = ptlrpc_import_recovery_state_machine(imp);
if (rc == -ENOTCONN) {
CDEBUG(D_HA,
"evicted/aborted by %s@%s during recovery; invalidating and reconnecting\n",
obd2cli_tgt(imp->imp_obd),
libcfs_nidstr(&imp->imp_connection->c_peer.nid));
ptlrpc_connect_import(imp);
clear_bit(IMPF_CONNECTED, imp->imp_flags);
set_bit(IMPF_CONNECT_TRIED, imp->imp_flags);
smp_mb__after_atomic();
RETURN(0);
}
out:
if (exp != NULL)
class_export_put(exp);
spin_lock(&imp->imp_lock);
clear_bit(IMPF_CONNECTED, imp->imp_flags);
set_bit(IMPF_CONNECT_TRIED, imp->imp_flags);
smp_mb__after_atomic();
if (rc != 0) {
bool inact = false;
time64_t now = ktime_get_seconds();
time64_t next_connect;
import_set_state_nolock(imp, LUSTRE_IMP_DISCON);
if (rc == -EACCES || rc == -EROFS) {
/*
* -EACCES means client has no permission for connection
* -EROFS means client must mount read-only
* Client deactivates import, it can be activated back
* manually when issue is resolved
* Server keeps trying forever until reconfigured or
* unmounted
*/
LCONSOLE_WARN("%s: connection denied by %s: rc = %d\n",
imp->imp_obd->obd_name,
obd2cli_tgt(imp->imp_obd), rc);
if (imp->imp_connect_flags_orig &
(OBD_CONNECT_LIGHTWEIGHT |
OBD_CONNECT_MDS_MDS | OBD_CONNECT_MDS)) {
/* consider LWP, MDT-MDT and MDT-OST access
* errors as temporary
*/
rc = -EAGAIN;
set_bit(IMPF_FORCE_RECONNECT, imp->imp_flags);
smp_mb__after_atomic();
} else {
set_bit(IMPF_DEACTIVE, imp->imp_flags);
/* This does the barrier for us. */
ptlrpc_deactivate_import_nolock(imp);
inact = true;
}
} else if (rc == -EPROTO) {
struct obd_connect_data *ocd;
/* reply message might not be ready */
if (request->rq_repmsg == NULL) {
spin_unlock(&imp->imp_lock);
RETURN(-EPROTO);
}
ocd = req_capsule_server_get(&request->rq_pill,
&RMF_CONNECT_DATA);
/* Servers are not supposed to refuse connections from
* clients based on version, only connection feature
* flags. We should never see this from llite, but it
* may be useful for debugging in the future.
*/
if (ocd &&
(ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
(ocd->ocd_version != LUSTRE_VERSION_CODE)) {
LCONSOLE_ERROR("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);
set_bit(IMPF_DEACTIVE, imp->imp_flags);
smp_mb__after_atomic();
ptlrpc_deactivate_import_nolock(imp);
import_set_state_nolock(imp, LUSTRE_IMP_CLOSED);
inact = true;
}
} else if (rc == -ENODEV || rc == -ETIMEDOUT) {
/* ENODEV means there is no service, force reconnection
* to a pair if attempt happen ptlrpc_next_reconnect
* before now. ETIMEDOUT could be set during network
* error and do not guarantee request deadline happened.
*/
struct obd_import_conn *conn;
time64_t reconnect_time;
/* Same as ptlrpc_next_reconnect, but in past */
reconnect_time = now - INITIAL_CONNECT_TIMEOUT;
list_for_each_entry(conn, &imp->imp_conn_list,
oic_item) {
if (conn->oic_last_attempt <= reconnect_time) {
set_bit(IMPF_FORCE_VERIFY, imp->imp_flags);
break;
}
}
}
next_connect = imp->imp_conn_current->oic_last_attempt +
(request->rq_deadline - request->rq_sent);
spin_unlock(&imp->imp_lock);
if (inact) {
/* imp_deactive event */
obd_import_event(imp->imp_obd, imp,
IMP_EVENT_DEACTIVATE);
/* imp_invalid event */
obd_import_event(imp->imp_obd, imp, IMP_EVENT_INACTIVE);
/* evict and invalidate if reconnect */
if (!aa->pcaa_initial_connect) {
import_set_state(imp, LUSTRE_IMP_EVICTED);
ptlrpc_import_recovery_state_machine(imp);
}
}
if (rc == -EPROTO)
RETURN(rc);
/* adjust imp_next_ping to request deadline + 1 and reschedule
* a pinger if import lost processing during CONNECTING or far
* away from request deadline. It could happen when connection
* was initiated outside of pinger, like
* ptlrpc_set_import_discon().
*/
if (!test_bit(IMPF_FORCE_VERIFY, imp->imp_flags) &&
(imp->imp_next_ping <= now ||
imp->imp_next_ping > next_connect)) {
imp->imp_next_ping = max(now, next_connect) + 1;
ptlrpc_pinger_wake_up();
}
ptlrpc_maybe_ping_import_soon(imp);
CDEBUG(D_HA, "recovery of %s on %s failed (%d)\n",
obd2cli_tgt(imp->imp_obd),
libcfs_nidstr(&imp->imp_connection->c_peer.nid), rc);
} else {
spin_unlock(&imp->imp_lock);
}
wake_up(&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 *args, int rc)
{
ENTRY;
atomic_dec(&req->rq_import->imp_replay_inflight);
if (req->rq_status == 0 &&
!test_bit(IMPF_VBR_FAILED, req->rq_import->imp_flags)) {
ptlrpc_import_recovery_state_machine(req->rq_import);
} else {
if (test_bit(IMPF_VBR_FAILED, req->rq_import->imp_flags)) {
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;
ENTRY;
if (unlikely(CFS_FAIL_CHECK(OBD_FAIL_PTLRPC_FINISH_REPLAY)))
RETURN(0);
if (!atomic_add_unless(&imp->imp_replay_inflight, 1, 1))
RETURN(0);
req = ptlrpc_request_alloc_pack(imp, &RQF_OBD_PING, LUSTRE_OBD_VERSION,
OBD_PING);
if (IS_ERR(req)) {
atomic_dec(&imp->imp_replay_inflight);
RETURN(PTR_ERR(req));
}
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 (obd_at_off(imp->imp_obd))
req->rq_timeout *= 3;
req->rq_no_delay = 1;
req->rq_interpret_reply = completed_replay_interpret;
ptlrpcd_add_req(req);
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;
ENTRY;
unshare_fs_struct();
CDEBUG(D_HA, "thread invalidate import %s to %s@%s\n",
imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd),
libcfs_nidstr(&imp->imp_connection->c_peer.nid));
if (do_dump_on_eviction(imp->imp_obd, DUMP_PTLRPC_CONN)) {
CERROR("%s: dump the log upon eviction\n",
imp->imp_obd->obd_name);
libcfs_debug_dumplog();
}
ptlrpc_invalidate_import(imp);
import_set_state(imp, LUSTRE_IMP_RECOVER);
ptlrpc_import_recovery_state_machine(imp);
class_import_put(imp);
RETURN(0);
}
/**
* ptlrpc_import_recovery_state_machine() - State machine for client-side
* recovery on import
* @imp: client side connection
*
* This is the state machine for client-side recovery on import.
*
* Typicaly 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.
*
* Return:
* * %0 on success
* * %negative on failure
*/
int ptlrpc_import_recovery_state_machine(struct obd_import *imp)
{
int rc = 0;
int inflight;
char *target_start;
int target_len;
ENTRY;
if (imp->imp_state == LUSTRE_IMP_EVICTED) {
struct task_struct *task;
u64 connect_flags;
deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
&target_start, &target_len);
connect_flags = imp->imp_connect_data.ocd_connect_flags;
/* Don't care about MGC eviction */
if (strcmp(imp->imp_obd->obd_type->typ_name,
LUSTRE_MGC_NAME) != 0 &&
(connect_flags & OBD_CONNECT_LIGHTWEIGHT) == 0) {
/* below message checked in test-framework client_evicted() */
LCONSOLE(D_ERROR, "%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);
if (do_dump_on_eviction(imp->imp_obd,
DUMP_PTLRPC_CONN)) {
CERROR("%s: dump the log upon eviction\n",
imp->imp_obd->obd_name);
libcfs_debug_dumplog();
}
}
CDEBUG(D_HA, "evicted from %s@%s; invalidating\n",
obd2cli_tgt(imp->imp_obd),
libcfs_nidstr(&imp->imp_connection->c_peer.nid));
/* reset vbr_failed flag upon eviction */
clear_bit(IMPF_VBR_FAILED, imp->imp_flags);
smp_mb__after_atomic();
/* bug 17802: XXX client_disconnect_export vs connect request
* race. if client is evicted at this time then 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);
rc = PTR_ERR(task);
CERROR("%s: can't start invalidate thread: rc = %d\n",
imp->imp_obd->obd_name, rc);
} 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);
}
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, rc);
}
}
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) {
struct ptlrpc_connection *conn = imp->imp_connection;
rc = ptlrpc_resend(imp);
if (rc)
GOTO(out, rc);
ptlrpc_activate_import(imp, true);
/* Reverse import are flagged with dlm_fake == 1.
* They do not do recovery and connection are not "restored".
*/
if (!test_bit(IMPF_DLM_FAKE, imp->imp_flags))
CDEBUG_LIMIT(test_bit(IMPF_WAS_IDLE, imp->imp_flags) ?
imp->imp_idle_debug : D_CONSOLE,
"%s: Connection restored to %s (at %s)\n",
imp->imp_obd->obd_name,
libcfs_nidstr(&conn->c_peer.nid),
obd_import_nid2str(imp));
clear_bit(IMPF_WAS_IDLE, imp->imp_flags);
smp_mb__after_atomic();
}
if (imp->imp_state == LUSTRE_IMP_FULL) {
wake_up(&imp->imp_recovery_waitq);
ptlrpc_wake_delayed(imp);
}
out:
RETURN(rc);
}
static struct ptlrpc_request *ptlrpc_disconnect_prep_req(struct obd_import *imp)
{
struct ptlrpc_request *req;
int rq_opc, rc = 0;
ENTRY;
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(ERR_PTR(rc));
}
req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_DISCONNECT,
LUSTRE_OBD_VERSION, rq_opc);
if (IS_ERR(req))
RETURN(ERR_CAST(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 server state */
req->rq_timeout = min_t(timeout_t, req->rq_timeout,
INITIAL_CONNECT_TIMEOUT);
req->rq_send_state = LUSTRE_IMP_CONNECTING;
ptlrpc_request_set_replen(req);
RETURN(req);
}
struct disconnect_async_arg {
struct completion *daa_completion;
int *daa_result;
int daa_noclose;
};
/*
* Unlock import.
*/
static void ptlrpc_disconnect_import_end(struct obd_import *imp, int noclose)
{
assert_spin_locked(&imp->imp_lock);
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);
obd_import_event(imp->imp_obd, imp, IMP_EVENT_DISCON);
if (!noclose)
obd_import_event(imp->imp_obd, imp, IMP_EVENT_INACTIVE);
}
static int ptlrpc_disconnect_interpet(const struct lu_env *env,
struct ptlrpc_request *req, void *args,
int rc)
{
struct obd_import *imp = req->rq_import;
struct disconnect_async_arg *daa = args;
spin_lock(&imp->imp_lock);
ptlrpc_disconnect_import_end(imp, daa->daa_noclose);
if (rc == -ETIMEDOUT || rc == -ENOTCONN || rc == -ESHUTDOWN)
rc = 0;
if (daa->daa_result)
*daa->daa_result = rc;
complete(daa->daa_completion);
return 0;
}
/**
* ptlrpc_disconnect_import_async() - Disconnect import
* @imp: import
* @noclose: final close import
* @cmpl: completion to signal disconnect is finished
* @out_res: result of disconnection [out]
*
* Sends disconnect request and set import state DISCONNECT/CLOSED.
* Produces events IMP_EVENT_DISCON[IMP_EVENT_INACTIVE].
* Signals when it is complete.
*
* Return:
* * %0 on seccess
* * %negative negated errno on error
**/
int ptlrpc_disconnect_import_async(struct obd_import *imp, int noclose,
struct completion *cmpl, int *out_res)
{
struct ptlrpc_request *req;
int rc = 0;
struct disconnect_async_arg *daa;
ENTRY;
spin_lock(&imp->imp_lock);
/* probably the import has been disconnected already being idle */
if (imp->imp_state != LUSTRE_IMP_FULL || test_bit(OBDF_FORCE, imp->imp_obd->obd_flags)) {
ptlrpc_disconnect_import_end(imp, noclose);
if (out_res)
*out_res = 0;
complete(cmpl);
RETURN(0);
}
spin_unlock(&imp->imp_lock);
req = ptlrpc_disconnect_prep_req(imp);
spin_lock(&imp->imp_lock);
if (IS_ERR(req) || imp->imp_state != LUSTRE_IMP_FULL ||
test_bit(OBDF_FORCE, imp->imp_obd->obd_flags)) {
if (!IS_ERR(req))
ptlrpc_req_put_with_imp_lock(req);
ptlrpc_disconnect_import_end(imp, noclose);
rc = IS_ERR(req) ? PTR_ERR(req) : 0;
if (out_res)
*out_res = rc;
complete(cmpl);
RETURN(rc);
}
import_set_state_nolock(imp, LUSTRE_IMP_CONNECTING);
spin_unlock(&imp->imp_lock);
req->rq_interpret_reply = ptlrpc_disconnect_interpet;
daa = ptlrpc_req_async_args(daa, req);
daa->daa_completion = cmpl;
daa->daa_result = out_res;
daa->daa_noclose = noclose;
ptlrpcd_add_req(req);
RETURN(rc);
}
EXPORT_SYMBOL(ptlrpc_disconnect_import_async);
/**
* ptlrpc_disconnect_import() - Send disconnect request to import
* @imp: import
* @noclose: final close import
*
* Sends disconnect request and set import state DISCONNECT/CLOSED.
* Produces events IMP_EVENT_DISCON[IMP_EVENT_INACTIVE].
*
* Return:
* * %0 on seccess
* * %negative negated errno on error
**/
int ptlrpc_disconnect_import(struct obd_import *imp, int noclose)
{
DECLARE_COMPLETION_ONSTACK(cmpl);
int rc;
ENTRY;
/* probably the import has been disconnected already being idle */
spin_lock(&imp->imp_lock);
if (imp->imp_state == LUSTRE_IMP_IDLE ||
test_bit(OBDF_FORCE, imp->imp_obd->obd_flags)) {
ptlrpc_disconnect_import_end(imp, noclose);
RETURN(0);
}
spin_unlock(&imp->imp_lock);
if (ptlrpc_import_in_recovery(imp)) {
long timeout_jiffies;
time64_t timeout;
if (obd_at_off(imp->imp_obd)) {
if (test_bit(IMPF_SERVER_TIMEOUT, imp->imp_flags))
timeout = obd_timeout >> 1;
else
timeout = obd_timeout;
} else {
u32 req_portal;
int idx;
req_portal = imp->imp_client->cli_request_portal;
idx = import_at_get_index(imp, req_portal);
timeout = obd_at_get(imp->imp_obd,
&imp->imp_at.iat_service_estimate[idx]);
}
timeout_jiffies = cfs_time_seconds(timeout);
if (wait_event_idle_timeout(imp->imp_recovery_waitq,
!ptlrpc_import_in_recovery(imp),
timeout_jiffies) == 0 &&
l_wait_event_abortable(imp->imp_recovery_waitq,
!ptlrpc_import_in_recovery(imp)) < 0)
rc = -EINTR;
}
rc = ptlrpc_disconnect_import_async(imp, noclose, &cmpl, &rc);
wait_for_completion(&cmpl);
RETURN(rc);
}
EXPORT_SYMBOL(ptlrpc_disconnect_import);
static void ptlrpc_reset_reqs_generation(struct obd_import *imp)
{
struct ptlrpc_request *old, *tmp;
/* tag all resendable requests generated before disconnection
* notice this code is part of disconnect-at-idle path only
*/
list_for_each_entry_safe(old, tmp, &imp->imp_delayed_list,
rq_list) {
spin_lock(&old->rq_lock);
if (old->rq_import_generation == imp->imp_generation - 1 &&
((imp->imp_initiated_at == imp->imp_generation) ||
!old->rq_no_resend))
old->rq_import_generation = imp->imp_generation;
spin_unlock(&old->rq_lock);
}
}
static int ptlrpc_disconnect_idle_interpret(const struct lu_env *env,
struct ptlrpc_request *req,
void *args, int rc)
{
struct obd_import *imp = req->rq_import;
int connect = 0;
DEBUG_REQ(D_HA, req, "inflight=%d, refcount=%d: rc = %d",
atomic_read(&imp->imp_inflight),
refcount_read(&imp->imp_refcount), rc);
spin_lock(&imp->imp_lock);
/* DISCONNECT reply can be late and another connection can just
* be initiated. so we have to abort disconnection.
*/
if (req->rq_import_generation == imp->imp_generation &&
imp->imp_state != LUSTRE_IMP_CLOSED) {
LASSERTF(imp->imp_state == LUSTRE_IMP_CONNECTING,
"%s\n", ptlrpc_import_state_name(imp->imp_state));
memset(&imp->imp_remote_handle, 0,
sizeof(imp->imp_remote_handle));
/* take our DISCONNECT into account */
if (atomic_read(&imp->imp_reqs) > 1) {
imp->imp_generation++;
imp->imp_initiated_at = imp->imp_generation;
import_set_state_nolock(imp, LUSTRE_IMP_NEW);
ptlrpc_reset_reqs_generation(imp);
connect = 1;
} else {
/* do not expose transient IDLE state */
import_set_state_nolock(imp, LUSTRE_IMP_IDLE);
}
}
if (connect) {
rc = ptlrpc_connect_import_locked(imp);
if (rc >= 0)
ptlrpc_pinger_add_import(imp);
} else {
spin_unlock(&imp->imp_lock);
}
return 0;
}
static bool ptlrpc_can_idle(struct obd_import *imp)
{
struct ldlm_namespace *ns = imp->imp_obd->obd_namespace;
/* one request for disconnect rpc */
if (atomic_read(&imp->imp_reqs) > 1)
return false;
/* any lock increases ns_bref being a resource holder */
if (ns && atomic_read(&ns->ns_bref) > 0)
return false;
return true;
}
int ptlrpc_disconnect_and_idle_import(struct obd_import *imp)
{
struct ptlrpc_request *req;
ENTRY;
if (test_bit(OBDF_FORCE, imp->imp_obd->obd_flags))
RETURN(0);
if (ptlrpc_import_in_recovery(imp))
RETURN(0);
req = ptlrpc_disconnect_prep_req(imp);
if (IS_ERR(req))
RETURN(PTR_ERR(req));
req->rq_interpret_reply = ptlrpc_disconnect_idle_interpret;
if (CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_IDLE_RACE)) {
__u32 idx;
server_name2index(imp->imp_obd->obd_name, &idx, NULL);
if (idx == 0)
CFS_RACE(OBD_FAIL_PTLRPC_IDLE_RACE);
}
spin_lock(&imp->imp_lock);
if (imp->imp_state != LUSTRE_IMP_FULL || !ptlrpc_can_idle(imp)) {
ptlrpc_req_put_with_imp_lock(req);
spin_unlock(&imp->imp_lock);
RETURN(0);
}
import_set_state_nolock(imp, LUSTRE_IMP_CONNECTING);
/* don't make noise at reconnection */
set_bit(IMPF_WAS_IDLE, imp->imp_flags);
spin_unlock(&imp->imp_lock);
CDEBUG_LIMIT(imp->imp_idle_debug, "%s: disconnect after %llus idle\n",
imp->imp_obd->obd_name,
ktime_get_real_seconds() - imp->imp_last_reply_time);
ptlrpcd_add_req(req);
RETURN(1);
}
EXPORT_SYMBOL(ptlrpc_disconnect_and_idle_import);
/**
* ptlrpc_cleanup_imp() - Cleanup @imp when connection termination/destroy
* @imp: client connection to server to be cleanup
*/
void ptlrpc_cleanup_imp(struct obd_import *imp)
{
ENTRY;
spin_lock(&imp->imp_lock);
import_set_state_nolock(imp, LUSTRE_IMP_CLOSED);
imp->imp_generation++;
ptlrpc_abort_inflight(imp);
spin_unlock(&imp->imp_lock);
EXIT;
}
/* Adaptive Timeout utils */
/* Update at_current_timeout with the specified value (bounded by at_min and
* at_max), as well as the AT history "bins".
* - Bin into timeslices using AT_BINS bins.
* - This gives us a max of the last at_history seconds 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.)
*/
timeout_t obd_at_measure(struct obd_device *obd, struct adaptive_timeout *at,
timeout_t timeout)
{
unsigned int l_at_min = obd_get_at_min(obd);
unsigned int l_at_max = obd_get_at_max(obd);
timeout_t old_timeout = at->at_current_timeout;
time64_t now = ktime_get_real_seconds();
long binlimit = max_t(long, obd_get_at_history(obd) / AT_BINS, 1);
LASSERT(at);
CDEBUG(D_OTHER, "add %u to %p time=%lld v=%u (%u %u %u %u)\n",
timeout, at, now - at->at_binstart, at->at_current_timeout,
at->at_hist[0], at->at_hist[1], at->at_hist[2], at->at_hist[3]);
if (timeout <= 0)
/* Negative timeouts and 0's don't count, because we never
* want our timeout to drop to 0 or below, 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_timeout = timeout;
at->at_worst_timeout_ever = timeout;
at->at_worst_timestamp = now;
at->at_hist[0] = timeout;
at->at_binstart = now;
} else if (now - at->at_binstart < binlimit) {
/* in bin 0 */
at->at_hist[0] = max_t(timeout_t, timeout, at->at_hist[0]);
at->at_current_timeout = max_t(timeout_t, timeout,
at->at_current_timeout);
} else {
int i, shift;
timeout_t maxv = timeout;
/* move bins over */
shift = (u32)(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_t(timeout_t, maxv, at->at_hist[i]);
} else {
at->at_hist[i] = 0;
}
}
at->at_hist[0] = timeout;
at->at_current_timeout = maxv;
at->at_binstart += shift * binlimit;
}
if (at->at_current_timeout > at->at_worst_timeout_ever) {
at->at_worst_timeout_ever = at->at_current_timeout;
at->at_worst_timestamp = now;
}
if (at->at_flags & AT_FLG_NOHIST)
/* Only keep last reported val; keeping the rest of the history
* for debugfs only
*/
at->at_current_timeout = timeout;
if (l_at_max > 0)
at->at_current_timeout = min_t(timeout_t,
at->at_current_timeout,
l_at_max);
at->at_current_timeout = max_t(timeout_t, at->at_current_timeout,
l_at_min);
if (at->at_current_timeout != old_timeout)
CDEBUG(D_OTHER,
"AT %p change: old=%u new=%u delta=%d (val=%d) hist %u %u %u %u\n",
at, old_timeout, at->at_current_timeout,
at->at_current_timeout - old_timeout, timeout,
at->at_hist[0], at->at_hist[1], at->at_hist[2],
at->at_hist[3]);
/* if we changed, report the old timeout value */
old_timeout = (at->at_current_timeout != old_timeout) ? old_timeout : 0;
spin_unlock(&at->at_lock);
return old_timeout;
}
/* 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;
}
