/* * 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.gnu.org/licenses/gpl-2.0.html * * GPL HEADER END */ /* * 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/ * * lustre/ptlrpc/import.c * * Author: Mike Shaver */ #define DEBUG_SUBSYSTEM S_RPC #include #include #include #include #include #include #include #include #include #include #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. */ 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); } /* 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)); imp->imp_invalid = 1; imp->imp_generation++; ptlrpc_abort_inflight(imp); EXIT; } /** * 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. * @invalid - set import invalid flag */ 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 (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, obd_import_nid2str(imp)); } 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, obd_import_nid2str(imp)); if (invalid) { 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_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; } /** * 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 (!imp->imp_invalid || imp->imp_obd->obd_no_recov) ptlrpc_deactivate_import(imp); if (OBD_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CONNECT_RACE)) { OBD_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(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 { long timeout_jiffies; /* 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 += 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). 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 = 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 (imp->imp_deactive != 0) { 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); imp->imp_invalid = 0; 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)); 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(); } EXPORT_SYMBOL(ptlrpc_pinger_force); void ptlrpc_fail_import(struct obd_import *imp, __u32 conn_cnt) { ENTRY; LASSERT(!imp->imp_dlm_fake); if (ptlrpc_set_import_discon(imp, conn_cnt, true)) ptlrpc_pinger_force(imp); EXIT; } int ptlrpc_reconnect_import(struct obd_import *imp) { #ifdef CONFIG_LUSTRE_FS_PINGER long timeout_jiffies = 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), obd_timeout); rc = wait_event_idle_timeout(imp->imp_recovery_waitq, !ptlrpc_import_in_recovery(imp), timeout_jiffies); if (rc == 0) rc = -ETIMEDOUT; else rc = 0; 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, false); /* 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; 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 */ imp->imp_obd->obd_no_recov = 0; /* Remove 'invalid' flag */ ptlrpc_activate_import(imp, false); /* 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; 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); } list_for_each_entry(conn, &imp->imp_conn_list, oic_item) { CDEBUG(D_HA, "%s: connect to NID %s last attempt %lld\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) || 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 (imp_conn->oic_last_attempt > 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 = ktime_get_seconds(); /* 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_nid2str(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_nid2str(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_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 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); } /** * Attempt to (re)connect import \a 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 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 || imp->imp_connected) { 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); 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 */ rc = sptlrpc_get_sepol(request); if (rc < 0) { ptlrpc_request_free(request); GOTO(out, rc); } bufs[5] = request->rq_sepol; req_capsule_set_size(&request->rq_pill, &RMF_SELINUX_POL, RCL_CLIENT, strlen(request->rq_sepol) ? strlen(request->rq_sepol) + 1 : 0); rc = ptlrpc_request_bufs_pack(request, LUSTRE_OBD_VERSION, imp->imp_connect_op, bufs, NULL); 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) { 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); 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); } 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)) { /* Sigh, some compilers do not like #ifdef in the middle of macro arguments */ const char *older = "older than client. " "Consider upgrading server"; const char *newer = "newer than client. " "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); 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; } 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 = 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 = min(ocd->ocd_brw_size >> PAGE_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; LASSERT((cli->cl_max_pages_per_rpc <= PTLRPC_MAX_BRW_PAGES) && (cli->cl_max_pages_per_rpc > 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. 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) || 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); 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 (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 || imp->imp_resend_replay) 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); } /** * 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 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) { imp->imp_connect_tried = 1; 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*/ imp->imp_force_reconnect = ptlrpc_busy_reconnect(rc); 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. */ imp->imp_connected = 1; 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, rc); } 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); 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); 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), imp->imp_connection->c_remote_uuid.uuid); 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) { imp->imp_replayable = 1; CDEBUG(D_HA, "connected to replayable target: %s\n", obd2cli_tgt(imp->imp_obd)); } else { imp->imp_replayable = 0; } /* 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_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), imp->imp_connection->c_remote_uuid.uuid, 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), 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); GOTO(finish, rc = 0); } } 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; 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 && !imp->imp_invalid) { 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 { 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) { 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), imp->imp_connection->c_remote_uuid.uuid); ptlrpc_connect_import(imp); spin_lock(&imp->imp_lock); imp->imp_connected = 0; imp->imp_connect_tried = 1; spin_unlock(&imp->imp_lock); RETURN(0); } out: if (exp != NULL) class_export_put(exp); spin_lock(&imp->imp_lock); imp->imp_connected = 0; imp->imp_connect_tried = 1; 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) { /* * Give up trying to reconnect * EACCES means client has no permission for connection */ imp->imp_obd->obd_no_recov = 1; 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_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_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) { imp->imp_force_verify = 1; break; } } } next_connect = imp->imp_conn_current->oic_last_attempt + (request->rq_deadline - request->rq_sent); spin_unlock(&imp->imp_lock); if (inact) obd_import_event(imp->imp_obd, imp, IMP_EVENT_INACTIVE); 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 (!imp->imp_force_verify && (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), (char *)imp->imp_connection->c_remote_uuid.uuid, 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 && !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; ENTRY; if (unlikely(OBD_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 (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); 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; 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); if (do_dump_on_eviction(imp->imp_obd)) { CERROR("dump the log upon eviction\n"); 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); } /** * 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. * */ 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; 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); LASSERTF(!obd_lbug_on_eviction, "LBUG upon eviction\n"); } 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); /* 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 (!imp->imp_dlm_fake) CDEBUG_LIMIT(imp->imp_was_idle ? imp->imp_idle_debug : D_CONSOLE, "%s: Connection restored to %s (at %s)\n", imp->imp_obd->obd_name, obd_uuid2str(&conn->c_remote_uuid), obd_import_nid2str(imp)); spin_lock(&imp->imp_lock); imp->imp_was_idle = 0; spin_unlock(&imp->imp_lock); } 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 (req == NULL) RETURN(ERR_PTR(-ENOMEM)); /* 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(timeout_t, req->rq_timeout, INITIAL_CONNECT_TIMEOUT); req->rq_send_state = LUSTRE_IMP_CONNECTING; ptlrpc_request_set_replen(req); RETURN(req); } int ptlrpc_disconnect_import(struct obd_import *imp, int noclose) { struct ptlrpc_request *req; int rc = 0; ENTRY; if (imp->imp_obd->obd_force) GOTO(set_state, rc); /* probably the import has been disconnected already being idle */ spin_lock(&imp->imp_lock); if (imp->imp_state == LUSTRE_IMP_IDLE) GOTO(out, rc); spin_unlock(&imp->imp_lock); if (ptlrpc_import_in_recovery(imp)) { long timeout_jiffies; time64_t timeout; if (AT_OFF) { if (imp->imp_server_timeout) 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 = at_get(&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; } req = ptlrpc_disconnect_prep_req(imp); if (IS_ERR(req)) GOTO(set_state, rc = PTR_ERR(req)); spin_lock(&imp->imp_lock); if (imp->imp_state != LUSTRE_IMP_FULL) { ptlrpc_req_finished_with_imp_lock(req); GOTO(out, rc); } import_set_state_nolock(imp, LUSTRE_IMP_CONNECTING); spin_unlock(&imp->imp_lock); 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); 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 (imp->imp_obd->obd_force) 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 (OBD_FAIL_PRECHECK(OBD_FAIL_PTLRPC_IDLE_RACE)) { __u32 idx; server_name2index(imp->imp_obd->obd_name, &idx, NULL); if (idx == 0) OBD_RACE(OBD_FAIL_PTLRPC_IDLE_RACE); } spin_lock(&imp->imp_lock); if (imp->imp_state != LUSTRE_IMP_FULL || !ptlrpc_can_idle(imp)) { ptlrpc_req_finished_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 */ imp->imp_was_idle = 1; 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); 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 at_measured(struct adaptive_timeout *at, timeout_t timeout) { timeout_t old_timeout = at->at_current_timeout; time64_t now = ktime_get_real_seconds(); long binlimit = max_t(long, at_history / 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 (at_max > 0) at->at_current_timeout = min_t(timeout_t, at->at_current_timeout, at_max); at->at_current_timeout = max_t(timeout_t, at->at_current_timeout, 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; }