4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2010, 2013, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/mgs/mgs_handler.c
38 * Author: Nathan Rutman <nathan@clusterfs.com>
39 * Author: Alex Zhuravlev <bzzz@whamcloud.com>
40 * Author: Mikhail Pershin <tappro@whamcloud.com>
43 #define DEBUG_SUBSYSTEM S_MGS
44 #define D_MGS D_CONFIG
46 #include <obd_class.h>
47 #include <lprocfs_status.h>
48 #include <lustre_ioctl.h>
49 #include <lustre_param.h>
51 #include "mgs_internal.h"
54 * Regular MGS handlers
56 static int mgs_connect(struct tgt_session_info *tsi)
58 struct ptlrpc_request *req = tgt_ses_req(tsi);
63 CFS_FAIL_TIMEOUT(OBD_FAIL_MGS_CONNECT_NET, cfs_fail_val);
64 rc = tgt_connect(tsi);
68 if (lustre_msg_get_conn_cnt(req->rq_reqmsg) > 1)
69 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
74 static int mgs_disconnect(struct tgt_session_info *tsi)
80 LASSERT(tsi->tsi_exp);
82 rc = tgt_disconnect(tsi);
84 RETURN(err_serious(rc));
88 static int mgs_exception(struct tgt_session_info *tsi)
92 tgt_counter_incr(tsi->tsi_exp, LPROC_MGS_EXCEPTION);
97 static int mgs_set_info(struct tgt_session_info *tsi)
99 struct mgs_thread_info *mgi;
100 struct mgs_send_param *msp, *rep_msp;
101 struct lustre_cfg *lcfg;
106 mgi = mgs_env_info(tsi->tsi_env);
108 RETURN(err_serious(PTR_ERR(mgi)));
110 msp = req_capsule_client_get(tsi->tsi_pill, &RMF_MGS_SEND_PARAM);
112 RETURN(err_serious(-EFAULT));
114 /* Construct lustre_cfg structure to pass to function mgs_setparam */
115 lustre_cfg_bufs_reset(&mgi->mgi_bufs, NULL);
116 lustre_cfg_bufs_set_string(&mgi->mgi_bufs, 1, msp->mgs_param);
117 lcfg = lustre_cfg_new(LCFG_PARAM, &mgi->mgi_bufs);
119 rc = mgs_setparam(tsi->tsi_env, exp2mgs_dev(tsi->tsi_exp), lcfg,
122 LCONSOLE_WARN("%s: Unable to set parameter %s for %s: %d\n",
123 tgt_name(tsi->tsi_tgt), msp->mgs_param,
124 mgi->mgi_fsname, rc);
128 /* send back the whole msp in the reply */
129 rep_msp = req_capsule_server_get(tsi->tsi_pill, &RMF_MGS_SEND_PARAM);
133 lustre_cfg_free(lcfg);
143 static int mgs_completion_ast_generic(struct ldlm_lock *lock, __u64 flags,
144 void *cbdata, enum ast_type type)
148 if (!(flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED |
149 LDLM_FL_BLOCK_CONV))) {
152 /* l_ast_data is used as a marker to avoid cancel ldlm lock
153 * twice. See LU-2317. */
154 lock_res_and_lock(lock);
155 fsdb = (struct fs_db *)lock->l_ast_data;
156 lock->l_ast_data = NULL;
157 unlock_res_and_lock(lock);
160 struct lustre_handle lockh;
164 /* clear the bit before lock put */
165 clear_bit(FSDB_REVOKING_LOCK,
169 clear_bit(FSDB_REVOKING_PARAMS,
173 mgs_ir_notify_complete(fsdb);
179 ldlm_lock2handle(lock, &lockh);
180 ldlm_lock_decref_and_cancel(&lockh, LCK_EX);
184 RETURN(ldlm_completion_ast(lock, flags, cbdata));
187 static int mgs_completion_ast_config(struct ldlm_lock *lock, __u64 flags,
190 return mgs_completion_ast_generic(lock, flags, cbdata, AST_CONFIG);
193 static int mgs_completion_ast_params(struct ldlm_lock *lock, __u64 flags,
196 return mgs_completion_ast_generic(lock, flags, cbdata, AST_PARAMS);
199 static int mgs_completion_ast_ir(struct ldlm_lock *lock, __u64 flags,
202 return mgs_completion_ast_generic(lock, flags, cbdata, AST_IR);
205 void mgs_revoke_lock(struct mgs_device *mgs, struct fs_db *fsdb, int type)
207 ldlm_completion_callback cp = NULL;
208 struct lustre_handle lockh = { 0 };
209 struct ldlm_res_id res_id;
210 __u64 flags = LDLM_FL_ATOMIC_CB;
214 LASSERT(fsdb->fsdb_name[0] != '\0');
215 rc = mgc_fsname2resid(fsdb->fsdb_name, &res_id, type);
218 case CONFIG_T_CONFIG:
219 cp = mgs_completion_ast_config;
220 if (test_and_set_bit(FSDB_REVOKING_LOCK, &fsdb->fsdb_flags))
223 case CONFIG_T_PARAMS:
224 cp = mgs_completion_ast_params;
225 if (test_and_set_bit(FSDB_REVOKING_PARAMS, &fsdb->fsdb_flags))
228 case CONFIG_T_RECOVER:
229 cp = mgs_completion_ast_ir;
236 rc = ldlm_cli_enqueue_local(mgs->mgs_obd->obd_namespace,
237 &res_id, LDLM_PLAIN, NULL, LCK_EX,
238 &flags, ldlm_blocking_ast, cp,
239 NULL, fsdb, 0, LVB_T_NONE, NULL,
241 if (rc != ELDLM_OK) {
242 CERROR("can't take cfg lock for "LPX64"/"LPX64"(%d)\n",
243 le64_to_cpu(res_id.name[0]),
244 le64_to_cpu(res_id.name[1]), rc);
246 if (type == CONFIG_T_CONFIG)
247 clear_bit(FSDB_REVOKING_LOCK,
250 if (type == CONFIG_T_PARAMS)
251 clear_bit(FSDB_REVOKING_PARAMS,
254 /* lock has been cancelled in completion_ast. */
263 static int mgs_check_target(const struct lu_env *env,
264 struct mgs_device *mgs,
265 struct mgs_target_info *mti)
270 rc = mgs_check_index(env, mgs, mti);
272 LCONSOLE_ERROR_MSG(0x13b, "%s claims to have registered, but "
273 "this MGS does not know about it, preventing "
274 "registration.\n", mti->mti_svname);
276 } else if (rc == -1) {
277 LCONSOLE_ERROR_MSG(0x13c, "Client log %s-client has "
278 "disappeared! Regenerating all logs.\n",
280 mti->mti_flags |= LDD_F_WRITECONF;
283 /* Index is correctly marked as used */
285 /* If the logs don't contain the mti_nids then add
286 them as failover nids */
287 rc = mgs_check_failnid(env, mgs, mti);
293 /* Ensure this is not a failover node that is connecting first*/
294 static int mgs_check_failover_reg(struct mgs_target_info *mti)
300 ptr = mti->mti_params;
301 while (class_find_param(ptr, PARAM_FAILNODE, &ptr) == 0) {
302 while (class_parse_nid_quiet(ptr, &nid, &ptr) == 0) {
303 for (i = 0; i < mti->mti_nid_count; i++) {
304 if (nid == mti->mti_nids[i]) {
305 LCONSOLE_WARN("Denying initial registra"
306 "tion attempt from nid %s"
307 ", specified as failover"
308 "\n",libcfs_nid2str(nid));
309 return -EADDRNOTAVAIL;
317 /* Called whenever a target starts up. Flags indicate first connect, etc. */
318 static int mgs_target_reg(struct tgt_session_info *tsi)
320 struct obd_device *obd = tsi->tsi_exp->exp_obd;
321 struct mgs_device *mgs = exp2mgs_dev(tsi->tsi_exp);
322 struct mgs_target_info *mti, *rep_mti;
329 rc = lu_env_refill((struct lu_env *)tsi->tsi_env);
331 return err_serious(rc);
333 tgt_counter_incr(tsi->tsi_exp, LPROC_MGS_TARGET_REG);
335 mti = req_capsule_client_get(tsi->tsi_pill, &RMF_MGS_TARGET_INFO);
337 DEBUG_REQ(D_HA, tgt_ses_req(tsi), "no mgs_send_param");
338 RETURN(err_serious(-EFAULT));
341 if (OCD_HAS_FLAG(&tgt_ses_req(tsi)->rq_export->exp_connect_data,
343 opc = mti->mti_flags & LDD_F_OPC_MASK;
347 if (opc == LDD_F_OPC_READY) {
348 CDEBUG(D_MGS, "fs: %s index: %d is ready to reconnect.\n",
349 mti->mti_fsname, mti->mti_stripe_index);
350 rc = mgs_ir_update(tsi->tsi_env, mgs, mti);
352 LASSERT(!(mti->mti_flags & LDD_F_IR_CAPABLE));
353 CERROR("Update IR return with %d(ignore and IR "
356 GOTO(out_nolock, rc);
359 /* Do not support unregistering right now. */
360 if (opc != LDD_F_OPC_REG)
361 GOTO(out_nolock, rc = -EINVAL);
363 CDEBUG(D_MGS, "fs: %s index: %d is registered to MGS.\n",
364 mti->mti_fsname, mti->mti_stripe_index);
366 if (mti->mti_flags & LDD_F_NEED_INDEX)
367 mti->mti_flags |= LDD_F_WRITECONF;
369 if (!(mti->mti_flags & (LDD_F_WRITECONF | LDD_F_UPGRADE14 |
371 /* We're just here as a startup ping. */
372 CDEBUG(D_MGS, "Server %s is running on %s\n",
373 mti->mti_svname, obd_export_nid2str(tsi->tsi_exp));
374 rc = mgs_check_target(tsi->tsi_env, mgs, mti);
375 /* above will set appropriate mti flags */
377 /* Nothing wrong, or fatal error */
378 GOTO(out_nolock, rc);
379 } else if (!(mti->mti_flags & LDD_F_NO_PRIMNODE)) {
380 rc = mgs_check_failover_reg(mti);
382 GOTO(out_nolock, rc);
385 OBD_FAIL_TIMEOUT(OBD_FAIL_MGS_PAUSE_TARGET_REG, 10);
387 if (mti->mti_flags & LDD_F_WRITECONF) {
388 if (mti->mti_flags & LDD_F_SV_TYPE_MDT &&
389 mti->mti_stripe_index == 0) {
390 rc = mgs_erase_logs(tsi->tsi_env, mgs,
392 LCONSOLE_WARN("%s: Logs for fs %s were removed by user "
393 "request. All servers must be restarted "
394 "in order to regenerate the logs."
395 "\n", obd->obd_name, mti->mti_fsname);
396 } else if (mti->mti_flags &
397 (LDD_F_SV_TYPE_OST | LDD_F_SV_TYPE_MDT)) {
398 rc = mgs_erase_log(tsi->tsi_env, mgs, mti->mti_svname);
399 LCONSOLE_WARN("%s: Regenerating %s log by user "
401 obd->obd_name, mti->mti_svname);
403 mti->mti_flags |= LDD_F_UPDATE;
404 /* Erased logs means start from scratch. */
405 mti->mti_flags &= ~LDD_F_UPGRADE14;
407 GOTO(out_nolock, rc);
410 rc = mgs_find_or_make_fsdb(tsi->tsi_env, mgs, mti->mti_fsname, &fsdb);
412 CERROR("Can't get db for %s: %d\n", mti->mti_fsname, rc);
413 GOTO(out_nolock, rc);
417 * Log writing contention is handled by the fsdb_mutex.
419 * It should be alright if someone was reading while we were
420 * updating the logs - if we revoke at the end they will just update
421 * from where they left off.
424 if (mti->mti_flags & LDD_F_UPGRADE14) {
425 CERROR("Can't upgrade from 1.4 (%d)\n", rc);
429 if (mti->mti_flags & LDD_F_UPDATE) {
430 CDEBUG(D_MGS, "updating %s, index=%d\n", mti->mti_svname,
431 mti->mti_stripe_index);
433 /* create or update the target log
434 and update the client/mdt logs */
435 rc = mgs_write_log_target(tsi->tsi_env, mgs, mti, fsdb);
437 CERROR("Failed to write %s log (%d)\n",
438 mti->mti_svname, rc);
442 mti->mti_flags &= ~(LDD_F_VIRGIN | LDD_F_UPDATE |
443 LDD_F_NEED_INDEX | LDD_F_WRITECONF |
445 mti->mti_flags |= LDD_F_REWRITE_LDD;
449 mgs_revoke_lock(mgs, fsdb, CONFIG_T_CONFIG);
452 CDEBUG(D_MGS, "replying with %s, index=%d, rc=%d\n", mti->mti_svname,
453 mti->mti_stripe_index, rc);
454 /* An error flag is set in the mti reply rather than an error code */
456 mti->mti_flags |= LDD_F_ERROR;
458 /* send back the whole mti in the reply */
459 rep_mti = req_capsule_server_get(tsi->tsi_pill, &RMF_MGS_TARGET_INFO);
462 /* Flush logs to disk */
463 dt_sync(tsi->tsi_env, mgs->mgs_bottom);
467 /* Called whenever a target cleans up. */
468 static int mgs_target_del(struct tgt_session_info *tsi)
472 tgt_counter_incr(tsi->tsi_exp, LPROC_MGS_TARGET_DEL);
477 static int mgs_config_read(struct tgt_session_info *tsi)
479 struct ptlrpc_request *req = tgt_ses_req(tsi);
480 struct mgs_config_body *body;
485 body = req_capsule_client_get(tsi->tsi_pill, &RMF_MGS_CONFIG_BODY);
487 DEBUG_REQ(D_HA, req, "no mgs_config_body");
488 RETURN(err_serious(-EFAULT));
491 switch (body->mcb_type) {
492 case CONFIG_T_RECOVER:
493 rc = mgs_get_ir_logs(req);
495 case CONFIG_T_CONFIG:
506 static int mgs_llog_open(struct tgt_session_info *tsi)
508 struct mgs_thread_info *mgi;
509 struct ptlrpc_request *req = tgt_ses_req(tsi);
515 rc = tgt_llog_open(tsi);
520 * For old clients there is no direct way of knowing which file system
521 * a client is operating at the MGS side. But we need to pick up those
522 * clients so that the MGS can mark the corresponding file system as
523 * non-IR capable because old clients are not ready to be notified.
525 * Therefore we attempt to detect the file systems name by hacking the
526 * llog operation which is currently used by the clients to fetch
527 * configuration logs. At present this is fine because this is the
528 * ONLY llog operation between mgc and the MGS.
530 * If extra llog operation are going to be added, this function needs
533 * When releases prior than 2.0 are not supported, the following code
536 mgi = mgs_env_info(tsi->tsi_env);
538 RETURN(PTR_ERR(mgi));
540 logname = req_capsule_client_get(tsi->tsi_pill, &RMF_NAME);
542 char *ptr = strchr(logname, '-');
543 int len = (int)(ptr - logname);
545 if ((ptr == NULL && strcmp(logname, PARAMS_FILENAME) != 0) ||
546 len >= sizeof(mgi->mgi_fsname)) {
547 LCONSOLE_WARN("%s: non-config logname received: %s\n",
548 tgt_name(tsi->tsi_tgt), logname);
549 /* not error, this can be llog test name */
551 strncpy(mgi->mgi_fsname, logname, len);
552 mgi->mgi_fsname[len] = 0;
554 rc = mgs_fsc_attach(tsi->tsi_env, tsi->tsi_exp,
556 if (rc && rc != -EEXIST) {
557 LCONSOLE_WARN("%s: Unable to add client %s "
558 "to file system %s: %d\n",
559 tgt_name(tsi->tsi_tgt),
560 libcfs_nid2str(req->rq_peer.nid),
561 mgi->mgi_fsname, rc);
567 CERROR("%s: no logname in request\n", tgt_name(tsi->tsi_tgt));
573 static inline int mgs_init_export(struct obd_export *exp)
575 struct mgs_export_data *data = &exp->u.eu_mgs_data;
577 /* init mgs_export_data for fsc */
578 spin_lock_init(&data->med_lock);
579 INIT_LIST_HEAD(&data->med_clients);
581 spin_lock(&exp->exp_lock);
582 exp->exp_connecting = 1;
583 spin_unlock(&exp->exp_lock);
585 /* self-export doesn't need client data and ldlm initialization */
586 if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
587 &exp->exp_client_uuid)))
589 return ldlm_init_export(exp);
592 static inline int mgs_destroy_export(struct obd_export *exp)
596 target_destroy_export(exp);
597 mgs_client_free(exp);
599 if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
600 &exp->exp_client_uuid)))
603 ldlm_destroy_export(exp);
608 static int mgs_extract_fs_pool(char * arg, char *fsname, char *poolname)
613 for (ptr = arg; (*ptr != '\0') && (*ptr != '.'); ptr++ ) {
621 strcpy(poolname, ptr);
626 static int mgs_iocontrol_nodemap(const struct lu_env *env,
627 struct mgs_device *mgs,
628 struct obd_ioctl_data *data)
630 struct lustre_cfg *lcfg = NULL;
631 struct lu_nodemap *nodemap;
633 const char *nodemap_name = NULL;
634 const char *nidstr = NULL;
635 const char *client_idstr = NULL;
636 const char *idtype_str = NULL;
647 if (data->ioc_type != LUSTRE_CFG_TYPE) {
648 CERROR("%s: unknown cfg record type: %d\n",
649 mgs->mgs_obd->obd_name, data->ioc_type);
650 GOTO(out, rc = -EINVAL);
653 if (data->ioc_plen1 > PAGE_CACHE_SIZE)
654 GOTO(out, rc = -E2BIG);
656 OBD_ALLOC(lcfg, data->ioc_plen1);
658 GOTO(out, rc = -ENOMEM);
660 if (copy_from_user(lcfg, data->ioc_pbuf1, data->ioc_plen1))
661 GOTO(out_lcfg, rc = -EFAULT);
663 cmd = lcfg->lcfg_command;
666 case LCFG_NODEMAP_ACTIVATE:
667 if (lcfg->lcfg_bufcount != 2)
668 GOTO(out_lcfg, rc = -EINVAL);
669 param = lustre_cfg_string(lcfg, 1);
670 if (strcmp(param, "1") == 0)
675 case LCFG_NODEMAP_ADD:
676 case LCFG_NODEMAP_DEL:
677 if (lcfg->lcfg_bufcount != 2)
678 GOTO(out_lcfg, rc = -EINVAL);
679 nodemap_name = lustre_cfg_string(lcfg, 1);
680 rc = mgs_nodemap_cmd(env, mgs, cmd, nodemap_name, param);
682 case LCFG_NODEMAP_TEST_NID:
683 if (lcfg->lcfg_bufcount != 2)
684 GOTO(out_lcfg, rc = -EINVAL);
685 nidstr = lustre_cfg_string(lcfg, 1);
686 nid = libcfs_str2nid(nidstr);
687 nodemap = nodemap_classify_nid(nid);
688 memset(data->ioc_pbuf1, 0, data->ioc_plen1);
689 if (copy_to_user(data->ioc_pbuf1, nodemap->nm_name,
690 strlen(nodemap->nm_name)) != 0)
691 GOTO(out_lcfg, rc = -EFAULT);
693 case LCFG_NODEMAP_TEST_ID:
694 if (lcfg->lcfg_bufcount != 4)
695 GOTO(out_lcfg, rc = -EINVAL);
696 nidstr = lustre_cfg_string(lcfg, 1);
697 idtype_str = lustre_cfg_string(lcfg, 2);
698 client_idstr = lustre_cfg_string(lcfg, 3);
700 nid = libcfs_str2nid(nidstr);
701 nodemap = nodemap_classify_nid(nid);
702 client_id = simple_strtoul(client_idstr, NULL, 10);
704 if (strcmp(idtype_str, "uid") == 0)
705 idtype = NODEMAP_UID;
707 idtype = NODEMAP_GID;
709 fs_id = nodemap_map_id(nodemap, idtype, NODEMAP_CLIENT_TO_FS,
712 if (data->ioc_plen1 < sizeof(fs_idstr))
713 GOTO(out_lcfg, rc = -EINVAL);
715 snprintf(fs_idstr, sizeof(fs_idstr), "%u", fs_id);
716 if (copy_to_user(data->ioc_pbuf1, fs_idstr,
717 sizeof(fs_idstr)) != 0)
718 GOTO(out_lcfg, rc = -EINVAL);
720 case LCFG_NODEMAP_ADD_RANGE:
721 case LCFG_NODEMAP_DEL_RANGE:
722 case LCFG_NODEMAP_ADD_UIDMAP:
723 case LCFG_NODEMAP_DEL_UIDMAP:
724 case LCFG_NODEMAP_ADD_GIDMAP:
725 case LCFG_NODEMAP_DEL_GIDMAP:
726 if (lcfg->lcfg_bufcount != 3)
727 GOTO(out_lcfg, rc = -EINVAL);
728 nodemap_name = lustre_cfg_string(lcfg, 1);
729 param = lustre_cfg_string(lcfg, 2);
730 rc = mgs_nodemap_cmd(env, mgs, cmd, nodemap_name, param);
732 case LCFG_NODEMAP_ADMIN:
733 case LCFG_NODEMAP_TRUSTED:
734 case LCFG_NODEMAP_SQUASH_UID:
735 case LCFG_NODEMAP_SQUASH_GID:
736 if (lcfg->lcfg_bufcount != 4)
737 GOTO(out_lcfg, rc = -EINVAL);
738 nodemap_name = lustre_cfg_string(lcfg, 1);
739 param = lustre_cfg_string(lcfg, 3);
740 rc = mgs_nodemap_cmd(env, mgs, cmd, nodemap_name, param);
747 CERROR("%s: OBD_IOC_NODEMAP command %X for %s: rc = %d\n",
748 mgs->mgs_obd->obd_name, lcfg->lcfg_command,
754 OBD_FREE(lcfg, data->ioc_plen1);
759 static int mgs_iocontrol_pool(const struct lu_env *env,
760 struct mgs_device *mgs,
761 struct obd_ioctl_data *data)
763 struct mgs_thread_info *mgi = mgs_env_info(env);
765 struct lustre_cfg *lcfg = NULL;
766 char *poolname = NULL;
769 OBD_ALLOC(poolname, LOV_MAXPOOLNAME + 1);
770 if (poolname == NULL)
773 if (data->ioc_type != LUSTRE_CFG_TYPE) {
774 CERROR("%s: unknown cfg record type: %d\n",
775 mgs->mgs_obd->obd_name, data->ioc_type);
776 GOTO(out_pool, rc = -EINVAL);
779 if (data->ioc_plen1 > PAGE_CACHE_SIZE)
780 GOTO(out_pool, rc = -E2BIG);
782 OBD_ALLOC(lcfg, data->ioc_plen1);
784 GOTO(out_pool, rc = -ENOMEM);
786 if (copy_from_user(lcfg, data->ioc_pbuf1, data->ioc_plen1))
787 GOTO(out_lcfg, rc = -EFAULT);
789 if (lcfg->lcfg_bufcount < 2)
790 GOTO(out_lcfg, rc = -EFAULT);
792 /* first arg is always <fsname>.<poolname> */
793 rc = mgs_extract_fs_pool(lustre_cfg_string(lcfg, 1), mgi->mgi_fsname,
798 switch (lcfg->lcfg_command) {
800 if (lcfg->lcfg_bufcount != 2)
801 GOTO(out_lcfg, rc = -EINVAL);
802 rc = mgs_pool_cmd(env, mgs, LCFG_POOL_NEW, mgi->mgi_fsname,
806 if (lcfg->lcfg_bufcount != 3)
807 GOTO(out_lcfg, rc = -EINVAL);
808 rc = mgs_pool_cmd(env, mgs, LCFG_POOL_ADD, mgi->mgi_fsname,
809 poolname, lustre_cfg_string(lcfg, 2));
812 if (lcfg->lcfg_bufcount != 3)
813 GOTO(out_lcfg, rc = -EINVAL);
814 rc = mgs_pool_cmd(env, mgs, LCFG_POOL_REM, mgi->mgi_fsname,
815 poolname, lustre_cfg_string(lcfg, 2));
818 if (lcfg->lcfg_bufcount != 2)
819 GOTO(out_lcfg, rc = -EINVAL);
820 rc = mgs_pool_cmd(env, mgs, LCFG_POOL_DEL, mgi->mgi_fsname,
828 CERROR("OBD_IOC_POOL err %d, cmd %X for pool %s.%s\n",
829 rc, lcfg->lcfg_command, mgi->mgi_fsname, poolname);
834 OBD_FREE(lcfg, data->ioc_plen1);
836 OBD_FREE(poolname, LOV_MAXPOOLNAME + 1);
840 /* from mdt_iocontrol */
841 int mgs_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
842 void *karg, void *uarg)
844 struct mgs_device *mgs = exp2mgs_dev(exp);
845 struct obd_ioctl_data *data = karg;
850 CDEBUG(D_IOCTL, "handling ioctl cmd %#x\n", cmd);
852 rc = lu_env_init(&env, LCT_MG_THREAD);
858 case OBD_IOC_PARAM: {
859 struct mgs_thread_info *mgi = mgs_env_info(&env);
860 struct lustre_cfg *lcfg;
862 if (data->ioc_type != LUSTRE_CFG_TYPE) {
863 CERROR("%s: unknown cfg record type: %d\n",
864 mgs->mgs_obd->obd_name, data->ioc_type);
865 GOTO(out, rc = -EINVAL);
868 OBD_ALLOC(lcfg, data->ioc_plen1);
870 GOTO(out, rc = -ENOMEM);
871 if (copy_from_user(lcfg, data->ioc_pbuf1, data->ioc_plen1))
872 GOTO(out_free, rc = -EFAULT);
874 if (lcfg->lcfg_bufcount < 1)
875 GOTO(out_free, rc = -EINVAL);
877 rc = mgs_setparam(&env, mgs, lcfg, mgi->mgi_fsname);
879 CERROR("%s: setparam err: rc = %d\n",
880 exp->exp_obd->obd_name, rc);
882 OBD_FREE(lcfg, data->ioc_plen1);
886 case OBD_IOC_REPLACE_NIDS: {
887 if (!data->ioc_inllen1 || !data->ioc_inlbuf1) {
888 CERROR("No device name specified!\n");
893 if (data->ioc_inlbuf1[data->ioc_inllen1 - 1] != 0) {
894 CERROR("Device name is not NUL terminated!\n");
899 if (data->ioc_plen1 > MTI_NAME_MAXLEN) {
900 CERROR("Device name is too long\n");
905 if (!data->ioc_inllen2 || !data->ioc_inlbuf2) {
906 CERROR("No NIDs were specified!\n");
911 if (data->ioc_inlbuf2[data->ioc_inllen2 - 1] != 0) {
912 CERROR("NID list is not NUL terminated!\n");
917 /* replace nids in llog */
918 rc = mgs_replace_nids(&env, mgs, data->ioc_inlbuf1,
921 CERROR("%s: error replacing nids: rc = %d\n",
922 exp->exp_obd->obd_name, rc);
928 rc = mgs_iocontrol_pool(&env, mgs, data);
931 case OBD_IOC_NODEMAP:
932 rc = mgs_iocontrol_nodemap(&env, mgs, data);
935 case OBD_IOC_DUMP_LOG: {
936 struct llog_ctxt *ctxt;
938 ctxt = llog_get_context(mgs->mgs_obd, LLOG_CONFIG_ORIG_CTXT);
939 rc = class_config_dump_llog(&env, ctxt, data->ioc_inlbuf1,
946 case OBD_IOC_CATLOGLIST:
947 rc = mgs_list_logs(&env, mgs, data);
949 case OBD_IOC_LLOG_CANCEL:
950 case OBD_IOC_LLOG_REMOVE:
951 case OBD_IOC_LLOG_CHECK:
952 case OBD_IOC_LLOG_INFO:
953 case OBD_IOC_LLOG_PRINT: {
954 struct llog_ctxt *ctxt;
956 ctxt = llog_get_context(mgs->mgs_obd, LLOG_CONFIG_ORIG_CTXT);
957 rc = llog_ioctl(&env, ctxt, cmd, data);
963 CERROR("%s: unknown command %#x\n",
964 mgs->mgs_obd->obd_name, cmd);
973 static int mgs_connect_to_osd(struct mgs_device *m, const char *nextdev)
975 struct obd_connect_data *data = NULL;
976 struct obd_device *obd;
984 obd = class_name2obd(nextdev);
986 CERROR("can't locate next device: %s\n", nextdev);
987 GOTO(out, rc = -ENOTCONN);
990 data->ocd_version = LUSTRE_VERSION_CODE;
992 rc = obd_connect(NULL, &m->mgs_bottom_exp, obd,
993 &obd->obd_uuid, data, NULL);
995 CERROR("cannot connect to next dev %s (%d)\n", nextdev, rc);
999 m->mgs_bottom = lu2dt_dev(m->mgs_bottom_exp->exp_obd->obd_lu_dev);
1000 m->mgs_dt_dev.dd_lu_dev.ld_site = m->mgs_bottom->dd_lu_dev.ld_site;
1001 LASSERT(m->mgs_dt_dev.dd_lu_dev.ld_site);
1007 static struct tgt_handler mgs_mgs_handlers[] = {
1008 TGT_RPC_HANDLER(MGS_FIRST_OPC,
1009 0, MGS_CONNECT, mgs_connect,
1010 &RQF_CONNECT, LUSTRE_OBD_VERSION),
1011 TGT_RPC_HANDLER(MGS_FIRST_OPC,
1012 0, MGS_DISCONNECT, mgs_disconnect,
1013 &RQF_MDS_DISCONNECT, LUSTRE_OBD_VERSION),
1014 TGT_MGS_HDL_VAR(0, MGS_EXCEPTION, mgs_exception),
1015 TGT_MGS_HDL (HABEO_REFERO | MUTABOR, MGS_SET_INFO, mgs_set_info),
1016 TGT_MGS_HDL (HABEO_REFERO | MUTABOR, MGS_TARGET_REG, mgs_target_reg),
1017 TGT_MGS_HDL_VAR(0, MGS_TARGET_DEL, mgs_target_del),
1018 TGT_MGS_HDL (HABEO_REFERO, MGS_CONFIG_READ, mgs_config_read),
1021 static struct tgt_handler mgs_obd_handlers[] = {
1022 TGT_OBD_HDL(0, OBD_PING, tgt_obd_ping),
1025 static struct tgt_handler mgs_dlm_handlers[] = {
1026 [LDLM_ENQUEUE - LDLM_FIRST_OPC] = {
1027 .th_name = "LDLM_ENQUEUE",
1028 /* don't use th_fail_id for MGS to don't interfere with MDS tests.
1029 * * There are no tests for MGS with OBD_FAIL_LDLM_ENQUEUE_NET so it
1030 * * is safe. If such tests will be needed we have to distinguish
1031 * * MDS and MGS fail ids, e.g use OBD_FAIL_MGS_ENQUEUE_NET for MGS
1032 * * instead of common OBD_FAIL_LDLM_ENQUEUE_NET */
1034 .th_opc = LDLM_ENQUEUE,
1035 .th_flags = HABEO_CLAVIS,
1036 .th_act = tgt_enqueue,
1037 .th_fmt = &RQF_LDLM_ENQUEUE,
1038 .th_version = LUSTRE_DLM_VERSION,
1042 static struct tgt_handler mgs_llog_handlers[] = {
1043 TGT_LLOG_HDL (0, LLOG_ORIGIN_HANDLE_CREATE, mgs_llog_open),
1044 TGT_LLOG_HDL (0, LLOG_ORIGIN_HANDLE_NEXT_BLOCK, tgt_llog_next_block),
1045 TGT_LLOG_HDL (0, LLOG_ORIGIN_HANDLE_READ_HEADER, tgt_llog_read_header),
1046 TGT_LLOG_HDL_VAR(0, LLOG_ORIGIN_HANDLE_CLOSE, tgt_llog_close),
1047 TGT_LLOG_HDL (0, LLOG_ORIGIN_HANDLE_PREV_BLOCK, tgt_llog_prev_block),
1050 static struct tgt_opc_slice mgs_common_slice[] = {
1052 .tos_opc_start = MGS_FIRST_OPC,
1053 .tos_opc_end = MGS_LAST_OPC,
1054 .tos_hs = mgs_mgs_handlers
1057 .tos_opc_start = OBD_FIRST_OPC,
1058 .tos_opc_end = OBD_LAST_OPC,
1059 .tos_hs = mgs_obd_handlers
1062 .tos_opc_start = LDLM_FIRST_OPC,
1063 .tos_opc_end = LDLM_LAST_OPC,
1064 .tos_hs = mgs_dlm_handlers
1067 .tos_opc_start = LLOG_FIRST_OPC,
1068 .tos_opc_end = LLOG_LAST_OPC,
1069 .tos_hs = mgs_llog_handlers
1072 .tos_opc_start = SEC_FIRST_OPC,
1073 .tos_opc_end = SEC_LAST_OPC,
1074 .tos_hs = tgt_sec_ctx_handlers
1081 static int mgs_init0(const struct lu_env *env, struct mgs_device *mgs,
1082 struct lu_device_type *ldt, struct lustre_cfg *lcfg)
1084 struct ptlrpc_service_conf conf;
1085 struct obd_device *obd;
1086 struct lustre_mount_info *lmi;
1087 struct llog_ctxt *ctxt;
1088 struct fs_db *fsdb = NULL;
1093 lmi = server_get_mount(lustre_cfg_string(lcfg, 0));
1097 mgs->mgs_dt_dev.dd_lu_dev.ld_ops = &mgs_lu_ops;
1099 rc = mgs_connect_to_osd(mgs, lustre_cfg_string(lcfg, 3));
1103 obd = class_name2obd(lustre_cfg_string(lcfg, 0));
1106 mgs->mgs_obd->obd_lu_dev = &mgs->mgs_dt_dev.dd_lu_dev;
1108 obd->u.obt.obt_magic = OBT_MAGIC;
1109 obd->u.obt.obt_instance = 0;
1111 /* namespace for mgs llog */
1112 obd->obd_namespace = ldlm_namespace_new(obd ,"MGS",
1113 LDLM_NAMESPACE_SERVER,
1114 LDLM_NAMESPACE_MODEST,
1116 if (obd->obd_namespace == NULL)
1117 GOTO(err_ops, rc = -ENOMEM);
1119 /* No recovery for MGCs */
1120 obd->obd_replayable = 0;
1122 rc = tgt_init(env, &mgs->mgs_lut, obd, mgs->mgs_bottom,
1123 mgs_common_slice, OBD_FAIL_MGS_ALL_REQUEST_NET,
1124 OBD_FAIL_MGS_ALL_REPLY_NET);
1128 rc = mgs_fs_setup(env, mgs);
1130 CERROR("%s: MGS filesystem method init failed: rc = %d\n",
1135 rc = llog_setup(env, obd, &obd->obd_olg, LLOG_CONFIG_ORIG_CTXT,
1136 obd, &llog_osd_ops);
1140 /* XXX: we need this trick till N:1 stack is supported
1141 * set "current" directory for named llogs */
1142 ctxt = llog_get_context(mgs->mgs_obd, LLOG_CONFIG_ORIG_CTXT);
1144 ctxt->loc_dir = mgs->mgs_configs_dir;
1145 llog_ctxt_put(ctxt);
1147 /* Internal mgs setup */
1148 mgs_init_fsdb_list(mgs);
1149 mutex_init(&mgs->mgs_mutex);
1150 mgs->mgs_start_time = cfs_time_current_sec();
1151 spin_lock_init(&mgs->mgs_lock);
1153 rc = lproc_mgs_setup(mgs, lustre_cfg_string(lcfg, 3));
1155 CERROR("%s: cannot initialize proc entry: rc = %d\n",
1160 /* Setup params fsdb and log, so that other servers can make a local
1161 * copy successfully when they are mounted. See LU-4783 */
1162 rc = mgs_params_fsdb_setup(env, mgs, fsdb);
1164 /* params fsdb and log can be setup later */
1165 CERROR("%s: %s fsdb and log setup failed: rc = %d\n",
1166 obd->obd_name, PARAMS_FILENAME, rc);
1168 ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
1169 "mgs_ldlm_client", &obd->obd_ldlm_client);
1171 conf = (typeof(conf)) {
1172 .psc_name = LUSTRE_MGS_NAME,
1173 .psc_watchdog_factor = MGS_SERVICE_WATCHDOG_FACTOR,
1175 .bc_nbufs = MGS_NBUFS,
1176 .bc_buf_size = MGS_BUFSIZE,
1177 .bc_req_max_size = MGS_MAXREQSIZE,
1178 .bc_rep_max_size = MGS_MAXREPSIZE,
1179 .bc_req_portal = MGS_REQUEST_PORTAL,
1180 .bc_rep_portal = MGC_REPLY_PORTAL,
1183 .tc_thr_name = "ll_mgs",
1184 .tc_nthrs_init = MGS_NTHRS_INIT,
1185 .tc_nthrs_max = MGS_NTHRS_MAX,
1186 .tc_ctx_tags = LCT_MG_THREAD,
1189 .so_req_handler = tgt_request_handle,
1190 .so_req_printer = target_print_req,
1194 /* Start the service threads */
1195 mgs->mgs_service = ptlrpc_register_service(&conf, obd->obd_proc_entry);
1196 if (IS_ERR(mgs->mgs_service)) {
1197 rc = PTR_ERR(mgs->mgs_service);
1198 CERROR("failed to start mgs service: %d\n", rc);
1199 mgs->mgs_service = NULL;
1200 GOTO(err_lproc, rc);
1203 ping_evictor_start();
1205 CDEBUG(D_INFO, "MGS %s started\n", obd->obd_name);
1207 /* device stack is not yet fully setup to keep no objects behind */
1208 lu_site_purge(env, mgs2lu_dev(mgs)->ld_site, ~0);
1211 mgs_params_fsdb_cleanup(env, mgs);
1212 lproc_mgs_cleanup(mgs);
1214 ctxt = llog_get_context(mgs->mgs_obd, LLOG_CONFIG_ORIG_CTXT);
1216 ctxt->loc_dir = NULL;
1217 llog_cleanup(env, ctxt);
1220 tgt_fini(env, &mgs->mgs_lut);
1222 /* No extra cleanup needed for llog_init_commit_thread() */
1223 mgs_fs_cleanup(env, mgs);
1225 ldlm_namespace_free(obd->obd_namespace, NULL, 0);
1226 obd->obd_namespace = NULL;
1228 lu_site_purge(env, mgs2lu_dev(mgs)->ld_site, ~0);
1229 if (!cfs_hash_is_empty(mgs2lu_dev(mgs)->ld_site->ls_obj_hash)) {
1230 LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, D_ERROR, NULL);
1231 lu_site_print(env, mgs2lu_dev(mgs)->ld_site, &msgdata,
1234 obd_disconnect(mgs->mgs_bottom_exp);
1237 server_put_mount(lustre_cfg_string(lcfg, 0), true);
1241 static struct lu_device *mgs_device_free(const struct lu_env *env,
1242 struct lu_device *lu)
1244 struct mgs_device *mgs = lu2mgs_dev(lu);
1247 dt_device_fini(&mgs->mgs_dt_dev);
1252 static int mgs_process_config(const struct lu_env *env,
1253 struct lu_device *dev,
1254 struct lustre_cfg *lcfg)
1260 static int mgs_object_init(const struct lu_env *env, struct lu_object *o,
1261 const struct lu_object_conf *unused)
1263 struct mgs_device *d = lu2mgs_dev(o->lo_dev);
1264 struct lu_device *under;
1265 struct lu_object *below;
1269 /* do no set .do_ops as mgs calls to bottom osd directly */
1271 CDEBUG(D_INFO, "object init, fid = "DFID"\n",
1272 PFID(lu_object_fid(o)));
1274 under = &d->mgs_bottom->dd_lu_dev;
1275 below = under->ld_ops->ldo_object_alloc(env, o->lo_header, under);
1277 lu_object_add(o, below);
1284 static void mgs_object_free(const struct lu_env *env, struct lu_object *o)
1286 struct mgs_object *obj = lu2mgs_obj(o);
1287 struct lu_object_header *h = o->lo_header;
1289 dt_object_fini(&obj->mgo_obj);
1290 lu_object_header_fini(h);
1294 static int mgs_object_print(const struct lu_env *env, void *cookie,
1295 lu_printer_t p, const struct lu_object *l)
1297 const struct mgs_object *o = lu2mgs_obj((struct lu_object *) l);
1299 return (*p)(env, cookie, LUSTRE_MGS_NAME"-object@%p", o);
1302 struct lu_object_operations mgs_lu_obj_ops = {
1303 .loo_object_init = mgs_object_init,
1304 .loo_object_free = mgs_object_free,
1305 .loo_object_print = mgs_object_print,
1308 struct lu_object *mgs_object_alloc(const struct lu_env *env,
1309 const struct lu_object_header *hdr,
1310 struct lu_device *d)
1312 struct lu_object_header *h;
1313 struct mgs_object *o;
1314 struct lu_object *l;
1316 LASSERT(hdr == NULL);
1320 l = &o->mgo_obj.do_lu;
1323 lu_object_header_init(h);
1324 dt_object_init(&o->mgo_obj, h, d);
1325 lu_object_add_top(h, l);
1327 l->lo_ops = &mgs_lu_obj_ops;
1335 const struct lu_device_operations mgs_lu_ops = {
1336 .ldo_object_alloc = mgs_object_alloc,
1337 .ldo_process_config = mgs_process_config,
1340 static struct lu_device *mgs_device_alloc(const struct lu_env *env,
1341 struct lu_device_type *type,
1342 struct lustre_cfg *lcfg)
1344 struct mgs_device *mgs;
1345 struct lu_device *ludev;
1349 ludev = ERR_PTR(-ENOMEM);
1353 ludev = mgs2lu_dev(mgs);
1354 dt_device_init(&mgs->mgs_dt_dev, type);
1355 rc = mgs_init0(env, mgs, type, lcfg);
1357 mgs_device_free(env, ludev);
1358 ludev = ERR_PTR(rc);
1364 static struct lu_device *mgs_device_fini(const struct lu_env *env,
1365 struct lu_device *d)
1367 struct mgs_device *mgs = lu2mgs_dev(d);
1368 struct obd_device *obd = mgs->mgs_obd;
1369 struct llog_ctxt *ctxt;
1373 LASSERT(mgs->mgs_bottom);
1375 class_disconnect_exports(obd);
1377 ping_evictor_stop();
1379 ptlrpc_unregister_service(mgs->mgs_service);
1381 obd_exports_barrier(obd);
1382 obd_zombie_barrier();
1384 tgt_fini(env, &mgs->mgs_lut);
1385 mgs_params_fsdb_cleanup(env, mgs);
1386 mgs_cleanup_fsdb_list(mgs);
1387 lproc_mgs_cleanup(mgs);
1389 ctxt = llog_get_context(mgs->mgs_obd, LLOG_CONFIG_ORIG_CTXT);
1391 ctxt->loc_dir = NULL;
1392 llog_cleanup(env, ctxt);
1395 mgs_fs_cleanup(env, mgs);
1397 ldlm_namespace_free(obd->obd_namespace, NULL, 1);
1398 obd->obd_namespace = NULL;
1400 lu_site_purge(env, d->ld_site, ~0);
1401 if (!cfs_hash_is_empty(d->ld_site->ls_obj_hash)) {
1402 LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, D_ERROR, NULL);
1403 lu_site_print(env, d->ld_site, &msgdata, lu_cdebug_printer);
1406 LASSERT(mgs->mgs_bottom_exp);
1407 obd_disconnect(mgs->mgs_bottom_exp);
1409 server_put_mount(obd->obd_name, true);
1414 /* context key constructor/destructor: mgs_key_init, mgs_key_fini */
1415 LU_KEY_INIT_FINI(mgs, struct mgs_thread_info);
1417 LU_TYPE_INIT_FINI(mgs, &mgs_thread_key);
1419 LU_CONTEXT_KEY_DEFINE(mgs, LCT_MG_THREAD);
1421 static struct lu_device_type_operations mgs_device_type_ops = {
1422 .ldto_init = mgs_type_init,
1423 .ldto_fini = mgs_type_fini,
1425 .ldto_start = mgs_type_start,
1426 .ldto_stop = mgs_type_stop,
1428 .ldto_device_alloc = mgs_device_alloc,
1429 .ldto_device_free = mgs_device_free,
1431 .ldto_device_fini = mgs_device_fini
1434 static struct lu_device_type mgs_device_type = {
1435 .ldt_tags = LU_DEVICE_DT,
1436 .ldt_name = LUSTRE_MGS_NAME,
1437 .ldt_ops = &mgs_device_type_ops,
1438 .ldt_ctx_tags = LCT_MG_THREAD
1441 static int mgs_obd_connect(const struct lu_env *env, struct obd_export **exp,
1442 struct obd_device *obd, struct obd_uuid *cluuid,
1443 struct obd_connect_data *data, void *localdata)
1445 struct obd_export *lexp;
1446 struct lustre_handle conn = { 0 };
1451 if (exp == NULL || obd == NULL || cluuid == NULL)
1454 rc = class_connect(&conn, obd, cluuid);
1458 lexp = class_conn2export(&conn);
1463 data->ocd_connect_flags &= MGS_CONNECT_SUPPORTED;
1464 data->ocd_version = LUSTRE_VERSION_CODE;
1465 lexp->exp_connect_data = *data;
1468 tgt_counter_incr(lexp, LPROC_MGS_CONNECT);
1470 rc = mgs_export_stats_init(obd, lexp, localdata);
1472 class_disconnect(lexp);
1479 static int mgs_obd_reconnect(const struct lu_env *env, struct obd_export *exp,
1480 struct obd_device *obd, struct obd_uuid *cluuid,
1481 struct obd_connect_data *data, void *localdata)
1485 if (exp == NULL || obd == NULL || cluuid == NULL)
1488 tgt_counter_incr(exp, LPROC_MGS_CONNECT);
1491 data->ocd_connect_flags &= MGS_CONNECT_SUPPORTED;
1492 data->ocd_version = LUSTRE_VERSION_CODE;
1493 exp->exp_connect_data = *data;
1496 RETURN(mgs_export_stats_init(obd, exp, localdata));
1499 static int mgs_obd_disconnect(struct obd_export *exp)
1507 mgs_fsc_cleanup(exp);
1509 class_export_get(exp);
1510 tgt_counter_incr(exp, LPROC_MGS_DISCONNECT);
1512 rc = server_disconnect_export(exp);
1513 class_export_put(exp);
1517 /* use obd ops to offer management infrastructure */
1518 static struct obd_ops mgs_obd_device_ops = {
1519 .o_owner = THIS_MODULE,
1520 .o_connect = mgs_obd_connect,
1521 .o_reconnect = mgs_obd_reconnect,
1522 .o_disconnect = mgs_obd_disconnect,
1523 .o_init_export = mgs_init_export,
1524 .o_destroy_export = mgs_destroy_export,
1525 .o_iocontrol = mgs_iocontrol,
1528 static int __init mgs_init(void)
1530 return class_register_type(&mgs_obd_device_ops, NULL, true, NULL,
1531 #ifndef HAVE_ONLY_PROCFS_SEQ
1534 LUSTRE_MGS_NAME, &mgs_device_type);
1537 static void /*__exit*/ mgs_exit(void)
1539 class_unregister_type(LUSTRE_MGS_NAME);
1542 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
1543 MODULE_DESCRIPTION("Lustre Management Server (MGS)");
1544 MODULE_LICENSE("GPL");
1546 module_init(mgs_init);
1547 module_exit(mgs_exit);