--- /dev/null
+/*
+ * 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;
+}
Code Review / kvmfornfv.git / blobdiff