1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * lustre/mgs/mgs_handler.c
5 * Lustre Management Server (mgs) request handler
7 * Copyright (C) 2006 Cluster File Systems, Inc.
8 * Author: Nathan Rutman <nathan@clusterfs.com>
10 * This file is part of Lustre, http://www.lustre.org.
12 * Lustre is free software; you can redistribute it and/or
13 * modify it under the terms of version 2 of the GNU General Public
14 * License as published by the Free Software Foundation.
16 * Lustre is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with Lustre; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 # define EXPORT_SYMTAB
29 #define DEBUG_SUBSYSTEM S_MGS
30 #define D_MGS D_CONFIG/*|D_WARNING*/
33 # include <linux/module.h>
34 # include <linux/pagemap.h>
35 # include <linux/miscdevice.h>
36 # include <linux/init.h>
38 # include <liblustre.h>
41 #include <obd_class.h>
42 #include <lustre_dlm.h>
43 #include <lprocfs_status.h>
44 #include <lustre_fsfilt.h>
45 #include <lustre_commit_confd.h>
46 #include <lustre_disk.h>
47 #include "mgs_internal.h"
50 /* Establish a connection to the MGS.*/
51 static int mgs_connect(const struct lu_env *env,
52 struct lustre_handle *conn, struct obd_device *obd,
53 struct obd_uuid *cluuid, struct obd_connect_data *data)
55 struct obd_export *exp;
59 if (!conn || !obd || !cluuid)
62 rc = class_connect(conn, obd, cluuid);
65 exp = class_conn2export(conn);
69 data->ocd_connect_flags &= MGS_CONNECT_SUPPORTED;
70 exp->exp_connect_flags = data->ocd_connect_flags;
71 data->ocd_version = LUSTRE_VERSION_CODE;
75 class_disconnect(exp);
77 class_export_put(exp);
83 static int mgs_disconnect(struct obd_export *exp)
89 class_export_get(exp);
91 /* Disconnect early so that clients can't keep using export */
92 rc = class_disconnect(exp);
93 ldlm_cancel_locks_for_export(exp);
95 /* complete all outstanding replies */
96 spin_lock(&exp->exp_lock);
97 while (!list_empty(&exp->exp_outstanding_replies)) {
98 struct ptlrpc_reply_state *rs =
99 list_entry(exp->exp_outstanding_replies.next,
100 struct ptlrpc_reply_state, rs_exp_list);
101 struct ptlrpc_service *svc = rs->rs_service;
103 spin_lock(&svc->srv_lock);
104 list_del_init(&rs->rs_exp_list);
105 ptlrpc_schedule_difficult_reply(rs);
106 spin_unlock(&svc->srv_lock);
108 spin_unlock(&exp->exp_lock);
110 class_export_put(exp);
114 static int mgs_cleanup(struct obd_device *obd);
115 static int mgs_handle(struct ptlrpc_request *req);
117 /* Start the MGS obd */
118 static int mgs_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
120 struct lprocfs_static_vars lvars;
121 struct mgs_obd *mgs = &obd->u.mgs;
122 struct lustre_mount_info *lmi;
123 struct lustre_sb_info *lsi;
124 struct vfsmount *mnt;
128 CDEBUG(D_CONFIG, "Starting MGS\n");
131 lmi = server_get_mount(obd->obd_name);
133 RETURN(rc = -EINVAL);
136 lsi = s2lsi(lmi->lmi_sb);
137 obd->obd_fsops = fsfilt_get_ops(MT_STR(lsi->lsi_ldd));
138 if (IS_ERR(obd->obd_fsops))
139 GOTO(err_put, rc = PTR_ERR(obd->obd_fsops));
141 /* namespace for mgs llog */
142 obd->obd_namespace = ldlm_namespace_new("MGS", LDLM_NAMESPACE_SERVER,
143 LDLM_NAMESPACE_MODEST);
144 if (obd->obd_namespace == NULL)
145 GOTO(err_ops, rc = -ENOMEM);
148 ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
149 "mgs_ldlm_client", &obd->obd_ldlm_client);
151 LASSERT(!lvfs_check_rdonly(lvfs_sbdev(mnt->mnt_sb)));
153 rc = mgs_fs_setup(obd, mnt);
155 CERROR("%s: MGS filesystem method init failed: rc = %d\n",
160 rc = llog_start_commit_thread();
164 rc = llog_setup(obd, NULL, LLOG_CONFIG_ORIG_CTXT, obd, 0, NULL,
169 /* No recovery for MGC's */
170 obd->obd_replayable = 0;
172 /* Internal mgs setup */
173 mgs_init_fsdb_list(obd);
174 sema_init(&mgs->mgs_sem, 1);
176 /* Start the service threads */
178 ptlrpc_init_svc(MGS_NBUFS, MGS_BUFSIZE, MGS_MAXREQSIZE,
179 MGS_MAXREPSIZE, MGS_REQUEST_PORTAL,
180 MGC_REPLY_PORTAL, MGS_SERVICE_WATCHDOG_TIMEOUT,
181 mgs_handle, LUSTRE_MGS_NAME,
182 obd->obd_proc_entry, NULL,
183 MGS_THREADS_AUTO_MIN, MGS_THREADS_AUTO_MAX,
184 "ll_mgs", LCT_MD_THREAD);
186 if (!mgs->mgs_service) {
187 CERROR("failed to start service\n");
188 GOTO(err_fs, rc = -ENOMEM);
191 rc = ptlrpc_start_threads(obd, mgs->mgs_service);
193 GOTO(err_thread, rc);
196 lprocfs_init_vars(mgs, &lvars);
197 if (lprocfs_obd_setup(obd, lvars.obd_vars) == 0) {
198 lproc_mgs_setup(obd);
201 ping_evictor_start();
203 LCONSOLE_INFO("MGS %s started\n", obd->obd_name);
208 ptlrpc_unregister_service(mgs->mgs_service);
210 /* No extra cleanup needed for llog_init_commit_thread() */
213 ldlm_namespace_free(obd->obd_namespace, 0);
214 obd->obd_namespace = NULL;
216 fsfilt_put_ops(obd->obd_fsops);
218 server_put_mount(obd->obd_name, mnt);
223 static int mgs_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
229 case OBD_CLEANUP_EARLY:
230 case OBD_CLEANUP_EXPORTS:
232 case OBD_CLEANUP_SELF_EXP:
233 llog_cleanup(llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT));
234 rc = obd_llog_finish(obd, 0);
236 case OBD_CLEANUP_OBD:
242 static int mgs_ldlm_nsfree(void *data)
244 struct ldlm_namespace *ns = (struct ldlm_namespace *)data;
248 ptlrpc_daemonize("ll_mgs_nsfree");
249 rc = ldlm_namespace_free(ns, 1 /* obd_force should always be on */);
253 static int mgs_cleanup(struct obd_device *obd)
255 struct mgs_obd *mgs = &obd->u.mgs;
258 if (mgs->mgs_sb == NULL)
263 ptlrpc_unregister_service(mgs->mgs_service);
265 mgs_cleanup_fsdb_list(obd);
267 lprocfs_obd_cleanup(obd);
268 mgs->mgs_proc_live = NULL;
272 server_put_mount(obd->obd_name, mgs->mgs_vfsmnt);
275 /* Free the namespace in it's own thread, so that if the
276 ldlm_cancel_handler put the last mgs obd ref, we won't
278 cfs_kernel_thread(mgs_ldlm_nsfree, obd->obd_namespace,
279 CLONE_VM | CLONE_FILES);
282 fsfilt_put_ops(obd->obd_fsops);
284 LCONSOLE_INFO("%s has stopped.\n", obd->obd_name);
288 /* similar to filter_prepare_destroy */
289 static int mgs_get_cfg_lock(struct obd_device *obd, char *fsname,
290 struct lustre_handle *lockh)
292 struct ldlm_res_id res_id;
296 rc = mgc_logname2resid(fsname, &res_id);
298 rc = ldlm_cli_enqueue_local(obd->obd_namespace, &res_id,
299 LDLM_PLAIN, NULL, LCK_EX,
300 &flags, ldlm_blocking_ast,
301 ldlm_completion_ast, NULL,
302 fsname, 0, NULL, lockh);
304 CERROR("can't take cfg lock for %s (%d)\n", fsname, rc);
309 static int mgs_put_cfg_lock(struct lustre_handle *lockh)
312 ldlm_lock_decref(lockh, LCK_EX);
319 static int mgs_check_target(struct obd_device *obd, struct mgs_target_info *mti)
324 rc = mgs_check_index(obd, mti);
326 LCONSOLE_ERROR_MSG(0x13b, "%s claims to have registered, but "
327 "this MGS does not know about it. Assuming"
328 " writeconf.\n", mti->mti_svname);
329 mti->mti_flags |= LDD_F_WRITECONF;
331 } else if (rc == -1) {
332 LCONSOLE_ERROR_MSG(0x13c, "Client log %s-client has "
333 "disappeared! Regenerating all logs.\n",
335 mti->mti_flags |= LDD_F_WRITECONF;
338 /* Index is correctly marked as used */
340 /* If the logs don't contain the mti_nids then add
341 them as failover nids */
342 rc = mgs_check_failnid(obd, mti);
348 /* Called whenever a target starts up. Flags indicate first connect, etc. */
349 static int mgs_handle_target_reg(struct ptlrpc_request *req)
351 struct obd_device *obd = req->rq_export->exp_obd;
352 struct lustre_handle lockh;
353 struct mgs_target_info *mti, *rep_mti;
354 int rep_size[] = { sizeof(struct ptlrpc_body), sizeof(*mti) };
358 mti = lustre_swab_reqbuf(req, REQ_REC_OFF, sizeof(*mti),
359 lustre_swab_mgs_target_info);
361 if (!(mti->mti_flags & (LDD_F_WRITECONF | LDD_F_UPGRADE14 |
363 /* We're just here as a startup ping. */
364 CDEBUG(D_MGS, "Server %s is running on %s\n",
365 mti->mti_svname, obd_export_nid2str(req->rq_export));
366 rc = mgs_check_target(obd, mti);
367 /* above will set appropriate mti flags */
369 /* Nothing wrong, or fatal error */
370 GOTO(out_nolock, rc);
373 /* Revoke the config lock to make sure nobody is reading. */
374 /* Although actually I think it should be alright if
375 someone was reading while we were updating the logs - if we
376 revoke at the end they will just update from where they left off. */
377 lockrc = mgs_get_cfg_lock(obd, mti->mti_fsname, &lockh);
378 if (lockrc != ELDLM_OK) {
379 LCONSOLE_ERROR_MSG(0x13d, "%s: Can't signal other nodes to "
380 "update their configuration (%d). Updating "
381 "local logs anyhow; you might have to "
382 "manually restart other nodes to get the "
383 "latest configuration.\n",
384 obd->obd_name, lockrc);
387 OBD_FAIL_TIMEOUT(OBD_FAIL_MGS_SLOW_TARGET_REG, 10);
389 /* Log writing contention is handled by the fsdb_sem */
391 if (mti->mti_flags & LDD_F_WRITECONF) {
392 if (mti->mti_flags & LDD_F_SV_TYPE_MDT) {
393 rc = mgs_erase_logs(obd, mti->mti_fsname);
394 LCONSOLE_WARN("%s: Logs for fs %s were removed by user "
395 "request. All servers must be restarted "
396 "in order to regenerate the logs."
397 "\n", obd->obd_name, mti->mti_fsname);
398 } else if (mti->mti_flags & LDD_F_SV_TYPE_OST) {
399 rc = mgs_erase_log(obd, mti->mti_svname);
400 LCONSOLE_WARN("%s: Regenerating %s log by user "
402 obd->obd_name, mti->mti_svname);
404 mti->mti_flags |= LDD_F_UPDATE;
405 /* Erased logs means start from scratch. */
406 mti->mti_flags &= ~LDD_F_UPGRADE14;
410 if (mti->mti_flags & LDD_F_UPGRADE14) {
411 rc = mgs_upgrade_sv_14(obd, mti);
413 CERROR("Can't upgrade from 1.4 (%d)\n", rc);
417 /* We're good to go */
418 mti->mti_flags |= LDD_F_UPDATE;
422 if (mti->mti_flags & LDD_F_UPDATE) {
423 CDEBUG(D_MGS, "updating %s, index=%d\n", mti->mti_svname,
424 mti->mti_stripe_index);
426 /* create or update the target log
427 and update the client/mdt logs */
428 rc = mgs_write_log_target(obd, mti);
430 CERROR("Failed to write %s log (%d)\n",
431 mti->mti_svname, rc);
435 mti->mti_flags &= ~(LDD_F_VIRGIN | LDD_F_UPDATE |
436 LDD_F_NEED_INDEX | LDD_F_WRITECONF |
438 mti->mti_flags |= LDD_F_REWRITE_LDD;
442 /* done with log update */
443 if (lockrc == ELDLM_OK)
444 mgs_put_cfg_lock(&lockh);
446 CDEBUG(D_MGS, "replying with %s, index=%d, rc=%d\n", mti->mti_svname,
447 mti->mti_stripe_index, rc);
448 lustre_pack_reply(req, 2, rep_size, NULL);
449 /* send back the whole mti in the reply */
450 rep_mti = lustre_msg_buf(req->rq_repmsg, REPLY_REC_OFF,
452 memcpy(rep_mti, mti, sizeof(*rep_mti));
454 /* Flush logs to disk */
455 fsfilt_sync(obd, obd->u.mgs.mgs_sb);
459 int mgs_handle(struct ptlrpc_request *req)
461 int fail = OBD_FAIL_MGS_ALL_REPLY_NET;
465 OBD_FAIL_TIMEOUT(OBD_FAIL_MGS_SLOW_REQUEST_NET, 2);
467 LASSERT(current->journal_info == NULL);
468 opc = lustre_msg_get_opc(req->rq_reqmsg);
469 if (opc != MGS_CONNECT) {
470 if (req->rq_export == NULL) {
471 CERROR("lustre_mgs: operation %d on unconnected MGS\n",
473 req->rq_status = -ENOTCONN;
474 GOTO(out, rc = -ENOTCONN);
480 DEBUG_REQ(D_MGS, req, "connect");
481 rc = target_handle_connect(req);
482 if (!rc && (lustre_msg_get_conn_cnt(req->rq_reqmsg) > 1))
483 /* Make clients trying to reconnect after a MGS restart
484 happy; also requires obd_replayable */
485 lustre_msg_add_op_flags(req->rq_repmsg,
486 MSG_CONNECT_RECONNECT);
489 DEBUG_REQ(D_MGS, req, "disconnect");
490 rc = target_handle_disconnect(req);
491 req->rq_status = rc; /* superfluous? */
494 DEBUG_REQ(D_MGS, req, "target add");
495 rc = mgs_handle_target_reg(req);
498 DEBUG_REQ(D_MGS, req, "target del");
499 //rc = mgs_handle_target_del(req);
503 DEBUG_REQ(D_MGS, req, "enqueue");
504 rc = ldlm_handle_enqueue(req, ldlm_server_completion_ast,
505 ldlm_server_blocking_ast, NULL);
507 case LDLM_BL_CALLBACK:
508 case LDLM_CP_CALLBACK:
509 DEBUG_REQ(D_MGS, req, "callback");
510 CERROR("callbacks should not happen on MGS\n");
515 DEBUG_REQ(D_INFO, req, "ping");
516 rc = target_handle_ping(req);
519 DEBUG_REQ(D_MGS, req, "log cancel");
520 rc = -ENOTSUPP; /* la la la */
523 case LLOG_ORIGIN_HANDLE_CREATE:
524 DEBUG_REQ(D_MGS, req, "llog_init");
525 rc = llog_origin_handle_create(req);
527 case LLOG_ORIGIN_HANDLE_NEXT_BLOCK:
528 DEBUG_REQ(D_MGS, req, "llog next block");
529 rc = llog_origin_handle_next_block(req);
531 case LLOG_ORIGIN_HANDLE_READ_HEADER:
532 DEBUG_REQ(D_MGS, req, "llog read header");
533 rc = llog_origin_handle_read_header(req);
535 case LLOG_ORIGIN_HANDLE_CLOSE:
536 DEBUG_REQ(D_MGS, req, "llog close");
537 rc = llog_origin_handle_close(req);
540 DEBUG_REQ(D_MGS, req, "llog catinfo");
541 rc = llog_catinfo(req);
544 req->rq_status = -ENOTSUPP;
545 rc = ptlrpc_error(req);
549 LASSERT(current->journal_info == NULL);
552 CERROR("MGS handle cmd=%d rc=%d\n", opc, rc);
555 target_send_reply(req, rc, fail);
559 static inline int mgs_destroy_export(struct obd_export *exp)
563 target_destroy_export(exp);
568 /* from mdt_iocontrol */
569 int mgs_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
570 void *karg, void *uarg)
572 struct obd_device *obd = exp->exp_obd;
573 struct obd_ioctl_data *data = karg;
574 struct lvfs_run_ctxt saved;
578 CDEBUG(D_IOCTL, "handling ioctl cmd %#x\n", cmd);
582 case OBD_IOC_PARAM: {
583 struct lustre_handle lockh;
584 struct lustre_cfg *lcfg;
585 struct llog_rec_hdr rec;
586 char fsname[MTI_NAME_MAXLEN];
589 rec.lrh_len = llog_data_len(data->ioc_plen1);
591 if (data->ioc_type == LUSTRE_CFG_TYPE) {
592 rec.lrh_type = OBD_CFG_REC;
594 CERROR("unknown cfg record type:%d \n", data->ioc_type);
598 OBD_ALLOC(lcfg, data->ioc_plen1);
601 rc = copy_from_user(lcfg, data->ioc_pbuf1, data->ioc_plen1);
605 if (lcfg->lcfg_bufcount < 1)
606 GOTO(out_free, rc = -EINVAL);
608 rc = mgs_setparam(obd, lcfg, fsname);
610 CERROR("setparam err %d\n", rc);
614 /* Revoke lock so everyone updates. Should be alright if
615 someone was already reading while we were updating the logs,
616 so we don't really need to hold the lock while we're
619 lockrc = mgs_get_cfg_lock(obd, fsname, &lockh);
620 if (lockrc != ELDLM_OK)
621 CERROR("lock error %d for fs %s\n", lockrc,
624 mgs_put_cfg_lock(&lockh);
628 OBD_FREE(lcfg, data->ioc_plen1);
632 case OBD_IOC_DUMP_LOG: {
633 struct llog_ctxt *ctxt =
634 llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT);
635 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
636 rc = class_config_dump_llog(ctxt, data->ioc_inlbuf1, NULL);
637 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
644 case OBD_IOC_LLOG_CHECK:
645 case OBD_IOC_LLOG_INFO:
646 case OBD_IOC_LLOG_PRINT: {
647 struct llog_ctxt *ctxt =
648 llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT);
650 push_ctxt(&saved, &ctxt->loc_exp->exp_obd->obd_lvfs_ctxt, NULL);
651 rc = llog_ioctl(ctxt, cmd, data);
652 pop_ctxt(&saved, &ctxt->loc_exp->exp_obd->obd_lvfs_ctxt, NULL);
658 CDEBUG(D_INFO, "unknown command %x\n", cmd);
664 /* use obd ops to offer management infrastructure */
665 static struct obd_ops mgs_obd_ops = {
666 .o_owner = THIS_MODULE,
667 .o_connect = mgs_connect,
668 .o_disconnect = mgs_disconnect,
669 .o_setup = mgs_setup,
670 .o_precleanup = mgs_precleanup,
671 .o_cleanup = mgs_cleanup,
672 .o_destroy_export = mgs_destroy_export,
673 .o_iocontrol = mgs_iocontrol,
676 static int __init mgs_init(void)
678 struct lprocfs_static_vars lvars;
680 lprocfs_init_vars(mgs, &lvars);
681 class_register_type(&mgs_obd_ops, NULL,
682 lvars.module_vars, LUSTRE_MGS_NAME, NULL);
687 static void /*__exit*/ mgs_exit(void)
689 class_unregister_type(LUSTRE_MGS_NAME);
692 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
693 MODULE_DESCRIPTION("Lustre Management Server (MGS)");
694 MODULE_LICENSE("GPL");
696 module_init(mgs_init);
697 module_exit(mgs_exit);