diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/ptlrpc/import.c')
| -rw-r--r-- | drivers/staging/lustre/lustre/ptlrpc/import.c | 1613 |
1 files changed, 1613 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lustre/ptlrpc/import.c b/drivers/staging/lustre/lustre/ptlrpc/import.c new file mode 100644 index 000000000000..47a3c0512739 --- /dev/null +++ b/drivers/staging/lustre/lustre/ptlrpc/import.c @@ -0,0 +1,1613 @@ +/* + * 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 <obd_support.h> +#include <lustre_ha.h> +#include <lustre_net.h> +#include <lustre_import.h> +#include <lustre_export.h> +#include <obd.h> +#include <obd_cksum.h> +#include <obd_class.h> + +#include "ptlrpc_internal.h" + +struct ptlrpc_connect_async_args { + __u64 pcaa_peer_committed; + int pcaa_initial_connect; +}; + +/** + * Updates import \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) +{ + 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 = + cfs_time_current_sec(); + 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)); + } + ptlrpc_deactivate_timeouts(imp); + 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) +{ + ENTRY; + LASSERT(spin_is_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); + + EXIT; +} + +/* + * 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 = cfs_time_current_sec(); + 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); + + 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); + imp->imp_invalid = 0; + ptlrpc_activate_timeouts(imp); + spin_unlock(&imp->imp_lock); + obd_import_event(obd, imp, IMP_EVENT_ACTIVE); +} +EXPORT_SYMBOL(ptlrpc_activate_import); + +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)) { + 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); + } + + CDEBUG(D_HA, "%s: waking up pinger\n", + obd2cli_tgt(imp->imp_obd)); + + spin_lock(&imp->imp_lock); + imp->imp_force_verify = 1; + spin_unlock(&imp->imp_lock); + + ptlrpc_pinger_wake_up(); + } + EXIT; +} +EXPORT_SYMBOL(ptlrpc_fail_import); + +int ptlrpc_reconnect_import(struct obd_import *imp) +{ + 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; +} +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; + ENTRY; + + 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 "LPU64"\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; + + if (list_empty(&imp->imp_replay_list)) + return 0; + 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"); + LBUG(); + } + + return 1; +} + +/** + * 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; + ENTRY; + + 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); + + rc = sptlrpc_import_sec_adapt(imp, NULL, 0); + 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. */ + 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, rc); + + request = ptlrpc_request_alloc(imp, &RQF_MDS_CONNECT); + if (request == NULL) + GOTO(out, rc = -ENOMEM); + + 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_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; + 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); + } + + 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, rc); + } + 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); + + /* 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="LPX64" grranted="LPX64"\n", + imp->imp_obd->obd_name,imp->imp_connect_flags_orig, + ocd->ocd_connect_flags); + GOTO(out, rc = -EPROTO); + } + + 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); + } + 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); + } + + 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 "LPX64"\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(level,"%s@%s changed server handle from " + LPX64" to "LPX64 + " 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 " + LPX64" to "LPX64"\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, LUSTRE_IMP_REPLAY); + } 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 "LPD64 + " was previously committed, server now claims "LPD64 + ")! 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 (!ocd->ocd_ibits_known && + ocd->ocd_connect_flags & OBD_CONNECT_IBITS) + CERROR("Inodebits aware server returned zero compatible" + " bits?\n"); + + 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 " + "alogrithm 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: "LPX64"\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) +{ + 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); + + 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; + + ENTRY; + + unshare_fs_struct(); + + CDEBUG(D_HA, "thread invalidate import %s to %s@%s\n", + imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd), + 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. + * + * 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) { + 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); + + { + task_t *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); + } + 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) { + 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, rc); + 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; + int nowait = imp->imp_obd->obd_force; + ENTRY; + + if (nowait) + GOTO(set_state, rc); + + 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: + CERROR("don't know how to disconnect from %s (connect_op %d)\n", + obd2cli_tgt(imp->imp_obd), imp->imp_connect_op); + RETURN(-EINVAL); + } + + if (ptlrpc_import_in_recovery(imp)) { + struct l_wait_info lwi; + cfs_duration_t 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, 0); + + 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); + + RETURN(rc); +} +EXPORT_SYMBOL(ptlrpc_disconnect_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++; + spin_unlock(&imp->imp_lock); + ptlrpc_abort_inflight(imp); + + EXIT; +} +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 = cfs_time_current_sec(); + 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; +} |