1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * lustre/mgc/mgc_request.c
5 * Lustre Management Client
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.
28 # define EXPORT_SYMTAB
30 #define DEBUG_SUBSYSTEM S_MGC
31 #define D_MGC D_CONFIG /*|D_WARNING*/
34 # include <linux/module.h>
35 # include <linux/pagemap.h>
36 # include <linux/miscdevice.h>
37 # include <linux/init.h>
39 # include <liblustre.h>
42 #include <obd_class.h>
43 #include <lustre_dlm.h>
44 #include <lustre_log.h>
45 #include <lustre_fsfilt.h>
46 #include <lustre_disk.h>
48 int mgc_logname2resid(char *logname, struct ldlm_res_id *res_id)
54 /* fsname is at most 8 chars long at the beginning of the logname
55 e.g. "lustre-MDT0001" or "lustre" */
56 name_end = strrchr(logname, '-');
58 len = name_end - logname;
60 len = strlen(logname);
62 CERROR("fsname too long: %s\n", logname);
66 CERROR("missing fsname: %s\n", logname);
69 memcpy(&resname, logname, len);
71 memset(res_id, 0, sizeof(*res_id));
73 /* Always use the same endianness for the resid */
74 res_id->name[0] = cpu_to_le64(resname);
75 CDEBUG(D_MGC, "log %s to resid "LPX64"/"LPX64" (%.8s)\n", logname,
76 res_id->name[0], res_id->name[1], (char *)&res_id->name[0]);
79 EXPORT_SYMBOL(mgc_logname2resid);
81 /********************** config llog list **********************/
82 static struct list_head config_llog_list = LIST_HEAD_INIT(config_llog_list);
83 static spinlock_t config_list_lock = SPIN_LOCK_UNLOCKED;
85 /* Take a reference to a config log */
86 static int config_log_get(struct config_llog_data *cld)
89 if (cld->cld_stopping)
91 atomic_inc(&cld->cld_refcount);
92 CDEBUG(D_INFO, "log %s refs %d\n", cld->cld_logname,
93 atomic_read(&cld->cld_refcount));
97 /* Drop a reference to a config log. When no longer referenced,
98 we can free the config log data */
99 static void config_log_put(struct config_llog_data *cld)
102 CDEBUG(D_INFO, "log %s refs %d\n", cld->cld_logname,
103 atomic_read(&cld->cld_refcount));
104 if (atomic_dec_and_test(&cld->cld_refcount)) {
105 CDEBUG(D_MGC, "dropping config log %s\n", cld->cld_logname);
106 class_export_put(cld->cld_mgcexp);
107 spin_lock(&config_list_lock);
108 list_del(&cld->cld_list_chain);
109 spin_unlock(&config_list_lock);
110 OBD_FREE(cld->cld_logname, strlen(cld->cld_logname) + 1);
111 if (cld->cld_cfg.cfg_instance != NULL)
112 OBD_FREE(cld->cld_cfg.cfg_instance,
113 strlen(cld->cld_cfg.cfg_instance) + 1);
114 OBD_FREE(cld, sizeof(*cld));
119 /* Find a config log by name */
120 static struct config_llog_data *config_log_find(char *logname,
121 struct config_llog_instance *cfg)
123 struct list_head *tmp;
124 struct config_llog_data *cld;
125 char *logid = logname;
126 int match_instance = 0;
129 if (cfg && cfg->cfg_instance) {
131 logid = cfg->cfg_instance;
134 CERROR("No log specified\n");
135 RETURN(ERR_PTR(-EINVAL));
138 spin_lock(&config_list_lock);
139 list_for_each(tmp, &config_llog_list) {
140 cld = list_entry(tmp, struct config_llog_data, cld_list_chain);
141 if (match_instance && cld->cld_cfg.cfg_instance &&
142 strcmp(logid, cld->cld_cfg.cfg_instance) == 0)
144 if (!match_instance &&
145 strcmp(logid, cld->cld_logname) == 0)
148 spin_unlock(&config_list_lock);
150 CDEBUG(D_CONFIG, "can't get log %s\n", logid);
151 RETURN(ERR_PTR(-ENOENT));
153 atomic_inc(&cld->cld_refcount);
154 spin_unlock(&config_list_lock);
158 /* Add this log to our list of active logs.
159 We have one active log per "mount" - client instance or servername.
160 Each instance may be at a different point in the log. */
161 static int config_log_add(char *logname, struct config_llog_instance *cfg,
162 struct super_block *sb)
164 struct config_llog_data *cld;
165 struct lustre_sb_info *lsi = s2lsi(sb);
169 CDEBUG(D_MGC, "adding config log %s:%s\n", logname, cfg->cfg_instance);
171 OBD_ALLOC(cld, sizeof(*cld));
174 OBD_ALLOC(cld->cld_logname, strlen(logname) + 1);
175 if (!cld->cld_logname) {
176 OBD_FREE(cld, sizeof(*cld));
179 strcpy(cld->cld_logname, logname);
181 cld->cld_cfg.cfg_last_idx = 0;
182 cld->cld_cfg.cfg_flags = 0;
183 cld->cld_cfg.cfg_sb = sb;
184 atomic_set(&cld->cld_refcount, 1);
186 /* Keep the mgc around until we are done */
187 cld->cld_mgcexp = class_export_get(lsi->lsi_mgc->obd_self_export);
189 if (cfg->cfg_instance != NULL) {
190 OBD_ALLOC(cld->cld_cfg.cfg_instance,
191 strlen(cfg->cfg_instance) + 1);
192 strcpy(cld->cld_cfg.cfg_instance, cfg->cfg_instance);
194 rc = mgc_logname2resid(logname, &cld->cld_resid);
195 spin_lock(&config_list_lock);
196 list_add(&cld->cld_list_chain, &config_llog_list);
197 spin_unlock(&config_list_lock);
207 /* Stop watching for updates on this log. */
208 static int config_log_end(char *logname, struct config_llog_instance *cfg)
210 struct config_llog_data *cld;
214 cld = config_log_find(logname, cfg);
216 RETURN(PTR_ERR(cld));
217 /* drop the ref from the find */
220 cld->cld_stopping = 1;
221 /* drop the start ref */
223 CDEBUG(D_MGC, "end config log %s (%d)\n", logname ? logname : "client",
228 /* reenqueue any lost locks */
229 #define RQ_RUNNING 0x1
233 static int rq_state = 0;
234 static cfs_waitq_t rq_waitq;
236 static int mgc_process_log(struct obd_device *mgc,
237 struct config_llog_data *cld);
239 static int mgc_requeue_thread(void *data)
241 struct l_wait_info lwi_now, lwi_later;
242 struct config_llog_data *cld, *n;
243 char name[] = "ll_cfg_requeue";
247 ptlrpc_daemonize(name);
249 CDEBUG(D_MGC, "Starting requeue thread\n");
251 lwi_later = LWI_TIMEOUT(60 * HZ, NULL, NULL);
252 l_wait_event(rq_waitq, rq_state & (RQ_NOW | RQ_STOP), &lwi_later);
254 /* Keep trying failed locks periodically */
255 spin_lock(&config_list_lock);
256 while (rq_state & (RQ_NOW | RQ_LATER)) {
257 /* Any new or requeued lostlocks will change the state */
258 rq_state &= ~(RQ_NOW | RQ_LATER);
259 spin_unlock(&config_list_lock);
261 /* Always wait a few seconds to allow the server who
262 caused the lock revocation to finish its setup, plus some
263 random so everyone doesn't try to reconnect at once. */
264 lwi_now = LWI_TIMEOUT(3 * HZ + (ll_rand() & 0xff) * (HZ / 100),
266 l_wait_event(rq_waitq, rq_state & RQ_STOP, &lwi_now);
268 spin_lock(&config_list_lock);
269 list_for_each_entry_safe(cld, n, &config_llog_list,
271 spin_unlock(&config_list_lock);
272 if (cld->cld_lostlock) {
273 CDEBUG(D_MGC, "updating log %s\n",
275 cld->cld_lostlock = 0;
276 rc = mgc_process_log(cld->cld_mgcexp->exp_obd,
278 /* Whether we enqueued again or not in
279 mgc_process_log, we're done with the ref
280 from the old enqueue */
283 spin_lock(&config_list_lock);
285 spin_unlock(&config_list_lock);
287 /* Wait a bit to see if anyone else needs a requeue */
288 l_wait_event(rq_waitq, rq_state & (RQ_NOW | RQ_STOP),
290 spin_lock(&config_list_lock);
292 /* spinlock and while guarantee RQ_NOW and RQ_LATER are not set */
293 rq_state &= ~RQ_RUNNING;
294 spin_unlock(&config_list_lock);
296 CDEBUG(D_MGC, "Ending requeue thread\n");
300 /* Add a cld to the list to requeue. Start the requeue thread if needed.
301 We are responsible for dropping the config log reference from here on out. */
302 static int mgc_requeue_add(struct config_llog_data *cld, int later)
306 CDEBUG(D_INFO, "log %s: requeue (l=%d r=%d sp=%d st=%x)\n",
307 cld->cld_logname, later, atomic_read(&cld->cld_refcount),
308 cld->cld_stopping, rq_state);
310 /* Hold lock for rq_state */
311 spin_lock(&config_list_lock);
312 cld->cld_lostlock = 1;
314 if (cld->cld_stopping || (rq_state & RQ_STOP)) {
315 spin_unlock(&config_list_lock);
320 if (!(rq_state & RQ_RUNNING)) {
321 LASSERT(rq_state == 0);
322 rq_state = RQ_RUNNING | (later ? RQ_LATER : RQ_NOW);
323 spin_unlock(&config_list_lock);
324 rc = cfs_kernel_thread(mgc_requeue_thread, 0,
325 CLONE_VM | CLONE_FILES);
327 CERROR("log %s: cannot start requeue thread (%d),"
328 "no more log updates!\n", cld->cld_logname, rc);
329 /* Drop the ref, since the rq thread won't */
330 cld->cld_lostlock = 0;
336 rq_state |= later ? RQ_LATER : RQ_NOW;
337 spin_unlock(&config_list_lock);
338 cfs_waitq_signal(&rq_waitq);
344 /********************** class fns **********************/
346 static int mgc_fs_setup(struct obd_device *obd, struct super_block *sb,
347 struct vfsmount *mnt)
349 struct lvfs_run_ctxt saved;
350 struct lustre_sb_info *lsi = s2lsi(sb);
351 struct client_obd *cli = &obd->u.cli;
352 struct dentry *dentry;
358 LASSERT(lsi->lsi_srv_mnt == mnt);
360 /* The mgc fs exclusion sem. Only one fs can be setup at a time. */
361 down(&cli->cl_mgc_sem);
363 cleanup_group_info();
365 obd->obd_fsops = fsfilt_get_ops(MT_STR(lsi->lsi_ldd));
366 if (IS_ERR(obd->obd_fsops)) {
367 up(&cli->cl_mgc_sem);
368 CERROR("No fstype %s rc=%ld\n", MT_STR(lsi->lsi_ldd),
369 PTR_ERR(obd->obd_fsops));
370 RETURN(PTR_ERR(obd->obd_fsops));
373 cli->cl_mgc_vfsmnt = mnt;
374 fsfilt_setup(obd, mnt->mnt_sb);
376 OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
377 obd->obd_lvfs_ctxt.pwdmnt = mnt;
378 obd->obd_lvfs_ctxt.pwd = mnt->mnt_root;
379 obd->obd_lvfs_ctxt.fs = get_ds();
381 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
382 dentry = lookup_one_len(MOUNT_CONFIGS_DIR, current->fs->pwd,
383 strlen(MOUNT_CONFIGS_DIR));
384 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
385 if (IS_ERR(dentry)) {
386 err = PTR_ERR(dentry);
387 CERROR("cannot lookup %s directory: rc = %d\n",
388 MOUNT_CONFIGS_DIR, err);
391 cli->cl_mgc_configs_dir = dentry;
393 /* We take an obd ref to insure that we can't get to mgc_cleanup
394 without calling mgc_fs_cleanup first. */
397 label = fsfilt_get_label(obd, mnt->mnt_sb);
399 CDEBUG(D_MGC, "MGC using disk labelled=%s\n", label);
401 /* We keep the cl_mgc_sem until mgc_fs_cleanup */
405 fsfilt_put_ops(obd->obd_fsops);
406 obd->obd_fsops = NULL;
407 cli->cl_mgc_vfsmnt = NULL;
408 up(&cli->cl_mgc_sem);
412 static int mgc_fs_cleanup(struct obd_device *obd)
414 struct client_obd *cli = &obd->u.cli;
418 LASSERT(cli->cl_mgc_vfsmnt != NULL);
420 if (cli->cl_mgc_configs_dir != NULL) {
421 struct lvfs_run_ctxt saved;
422 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
423 l_dput(cli->cl_mgc_configs_dir);
424 cli->cl_mgc_configs_dir = NULL;
425 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
429 cli->cl_mgc_vfsmnt = NULL;
431 fsfilt_put_ops(obd->obd_fsops);
433 up(&cli->cl_mgc_sem);
438 static atomic_t mgc_count = ATOMIC_INIT(0);
439 static int mgc_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
445 case OBD_CLEANUP_EARLY:
447 case OBD_CLEANUP_EXPORTS:
448 if (atomic_dec_and_test(&mgc_count)) {
449 /* Kick the requeue waitq - cld's should all be
451 spin_lock(&config_list_lock);
453 spin_unlock(&config_list_lock);
454 cfs_waitq_signal(&rq_waitq);
457 case OBD_CLEANUP_SELF_EXP:
458 rc = obd_llog_finish(obd, 0);
460 CERROR("failed to cleanup llogging subsystems\n");
462 case OBD_CLEANUP_OBD:
468 static int mgc_cleanup(struct obd_device *obd)
470 struct client_obd *cli = &obd->u.cli;
474 LASSERT(cli->cl_mgc_vfsmnt == NULL);
476 /* COMPAT_146 - old config logs may have added profiles we don't
478 if (obd->obd_type->typ_refcnt <= 1)
479 /* Only for the last mgc */
480 class_del_profiles();
484 rc = client_obd_cleanup(obd);
488 static int mgc_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
495 rc = client_obd_setup(obd, lcfg);
497 GOTO(err_decref, rc);
499 rc = obd_llog_init(obd, NULL, obd, 0, NULL, NULL);
501 CERROR("failed to setup llogging subsystems\n");
502 GOTO(err_cleanup, rc);
505 spin_lock(&config_list_lock);
506 atomic_inc(&mgc_count);
507 if (atomic_read(&mgc_count) == 1) {
508 rq_state &= ~RQ_STOP;
509 cfs_waitq_init(&rq_waitq);
511 spin_unlock(&config_list_lock);
516 client_obd_cleanup(obd);
522 /* based on ll_mdc_blocking_ast */
523 static int mgc_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
524 void *data, int flag)
526 struct lustre_handle lockh;
527 struct config_llog_data *cld = (struct config_llog_data *)data;
532 case LDLM_CB_BLOCKING:
533 /* mgs wants the lock, give it up... */
534 LDLM_DEBUG(lock, "MGC blocking CB");
535 ldlm_lock2handle(lock, &lockh);
536 rc = ldlm_cli_cancel(&lockh);
538 case LDLM_CB_CANCELING: {
539 /* We've given up the lock, prepare ourselves to update. */
540 LDLM_DEBUG(lock, "MGC cancel CB");
542 CDEBUG(D_MGC, "Lock res "LPX64" (%.8s)\n",
543 lock->l_resource->lr_name.name[0],
544 (char *)&lock->l_resource->lr_name.name[0]);
547 CERROR("missing data, won't requeue\n");
550 /* Are we done with this log? */
551 if (cld->cld_stopping) {
552 CDEBUG(D_MGC, "log %s: stopping, won't requeue\n",
557 /* Make sure not to re-enqueue when the mgc is stopping
558 (we get called from client_disconnect_export) */
559 if (!lock->l_conn_export ||
560 !lock->l_conn_export->exp_obd->u.cli.cl_conn_count) {
561 CDEBUG(D_MGC, "log %s: disconnecting, won't requeue\n",
566 /* Did we fail to get the lock? */
567 if (lock->l_req_mode != lock->l_granted_mode) {
568 CDEBUG(D_MGC, "log %s: original grant failed, will "
569 "requeue later\n", cld->cld_logname);
570 /* Try to re-enqueue later */
571 rc = mgc_requeue_add(cld, 1);
575 rc = mgc_requeue_add(cld, 0);
584 CERROR("%s CB failed %d:\n", flag == LDLM_CB_BLOCKING ?
585 "blocking" : "cancel", rc);
586 LDLM_ERROR(lock, "MGC ast");
591 /* Take a config lock so we can get cancel notifications */
592 static int mgc_enqueue(struct obd_export *exp, struct lov_stripe_md *lsm,
593 __u32 type, ldlm_policy_data_t *policy, __u32 mode,
594 int *flags, void *bl_cb, void *cp_cb, void *gl_cb,
595 void *data, __u32 lvb_len, void *lvb_swabber,
596 struct lustre_handle *lockh)
598 struct config_llog_data *cld = (struct config_llog_data *)data;
599 struct ldlm_enqueue_info einfo = { type, mode, mgc_blocking_ast,
600 ldlm_completion_ast, NULL, data};
605 CDEBUG(D_MGC, "Enqueue for %s (res "LPX64")\n", cld->cld_logname,
606 cld->cld_resid.name[0]);
608 /* We can only drop this config log ref when we drop the lock */
609 if (config_log_get(cld))
610 RETURN(ELDLM_LOCK_ABORTED);
612 /* We need a callback for every lockholder, so don't try to
613 ldlm_lock_match (see rev 1.1.2.11.2.47) */
615 rc = ldlm_cli_enqueue(exp, NULL, &einfo, &cld->cld_resid,
616 NULL, flags, NULL, 0, NULL, lockh, 0);
617 /* A failed enqueue should still call the mgc_blocking_ast,
618 where it will be requeued if needed ("grant failed"). */
623 static int mgc_cancel(struct obd_export *exp, struct lov_stripe_md *md,
624 __u32 mode, struct lustre_handle *lockh)
628 ldlm_lock_decref(lockh, mode);
634 static int mgc_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
635 void *karg, void *uarg)
637 struct obd_device *obd = exp->exp_obd;
638 struct obd_ioctl_data *data = karg;
639 struct llog_ctxt *ctxt;
640 struct lvfs_run_ctxt saved;
644 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
647 if (!try_module_get(THIS_MODULE)) {
648 CERROR("Can't get module. Is it alive?");
653 /* REPLicator context */
654 case OBD_IOC_PARSE: {
655 CERROR("MGC parsing llog %s\n", data->ioc_inlbuf1);
656 ctxt = llog_get_context(exp->exp_obd, LLOG_CONFIG_REPL_CTXT);
657 rc = class_config_parse_llog(ctxt, data->ioc_inlbuf1, NULL);
661 case OBD_IOC_LLOG_INFO:
662 case OBD_IOC_LLOG_PRINT: {
663 ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT);
664 rc = llog_ioctl(ctxt, cmd, data);
669 /* ORIGinator context */
670 case OBD_IOC_DUMP_LOG: {
671 ctxt = llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT);
672 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
673 rc = class_config_dump_llog(ctxt, data->ioc_inlbuf1, NULL);
674 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
681 CERROR("mgc_ioctl(): unrecognised ioctl %#x\n", cmd);
682 GOTO(out, rc = -ENOTTY);
685 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
688 module_put(THIS_MODULE);
695 /* Send target_reg message to MGS */
696 static int mgc_target_register(struct obd_export *exp,
697 struct mgs_target_info *mti)
699 struct ptlrpc_request *req;
700 struct mgs_target_info *req_mti, *rep_mti;
701 int size[] = { sizeof(struct ptlrpc_body), sizeof(*req_mti) };
702 int rep_size[] = { sizeof(struct ptlrpc_body), sizeof(*mti) };
706 req = ptlrpc_prep_req(class_exp2cliimp(exp), LUSTRE_MGS_VERSION,
707 MGS_TARGET_REG, 2, size, NULL);
711 req_mti = lustre_msg_buf(req->rq_reqmsg, REQ_REC_OFF, sizeof(*req_mti));
714 memcpy(req_mti, mti, sizeof(*req_mti));
716 ptlrpc_req_set_repsize(req, 2, rep_size);
718 CDEBUG(D_MGC, "register %s\n", mti->mti_svname);
720 rc = ptlrpc_queue_wait(req);
722 rep_mti = lustre_swab_repbuf(req, REPLY_REC_OFF,
724 lustre_swab_mgs_target_info);
725 memcpy(mti, rep_mti, sizeof(*rep_mti));
726 CDEBUG(D_MGC, "register %s got index = %d\n",
727 mti->mti_svname, mti->mti_stripe_index);
729 ptlrpc_req_finished(req);
734 int mgc_reconnect_import(struct obd_import *imp)
736 /* Force a new connect attempt */
737 ptlrpc_invalidate_import(imp);
738 /* Do a fresh connect next time by zeroing the handle */
739 ptlrpc_disconnect_import(imp, 1);
740 /* Wait for all invalidate calls to finish */
741 if (atomic_read(&imp->imp_inval_count) > 0) {
743 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
744 rc = l_wait_event(imp->imp_recovery_waitq,
745 (atomic_read(&imp->imp_inval_count) == 0),
748 CERROR("Interrupted, inval=%d\n",
749 atomic_read(&imp->imp_inval_count));
752 /* Allow reconnect attempts */
753 imp->imp_obd->obd_no_recov = 0;
754 /* Remove 'invalid' flag */
755 ptlrpc_activate_import(imp);
756 /* Attempt a new connect */
757 ptlrpc_recover_import(imp, NULL);
761 int mgc_set_info_async(struct obd_export *exp, obd_count keylen,
762 void *key, obd_count vallen, void *val,
763 struct ptlrpc_request_set *set)
765 struct obd_import *imp = class_exp2cliimp(exp);
769 /* Try to "recover" the initial connection; i.e. retry */
770 if (KEY_IS(KEY_INIT_RECOV)) {
771 if (vallen != sizeof(int))
773 spin_lock(&imp->imp_lock);
774 imp->imp_initial_recov = *(int *)val;
775 spin_unlock(&imp->imp_lock);
776 CDEBUG(D_HA, "%s: set imp_initial_recov = %d\n",
777 exp->exp_obd->obd_name, imp->imp_initial_recov);
780 /* Turn off initial_recov after we try all backup servers once */
781 if (KEY_IS(KEY_INIT_RECOV_BACKUP)) {
783 if (vallen != sizeof(int))
786 spin_lock(&imp->imp_lock);
787 imp->imp_initial_recov_bk = value > 0;
788 /* Even after the initial connection, give up all comms if
789 nobody answers the first time. */
790 imp->imp_recon_bk = 1;
791 spin_unlock(&imp->imp_lock);
792 CDEBUG(D_MGC, "InitRecov %s %d/%d:d%d:i%d:r%d:or%d:%s\n",
793 imp->imp_obd->obd_name, value, imp->imp_initial_recov,
794 imp->imp_deactive, imp->imp_invalid,
795 imp->imp_replayable, imp->imp_obd->obd_replayable,
796 ptlrpc_import_state_name(imp->imp_state));
797 /* Resurrect if we previously died */
798 if (imp->imp_invalid || value > 1)
799 mgc_reconnect_import(imp);
802 /* FIXME move this to mgc_process_config */
803 if (KEY_IS("register_target")) {
804 struct mgs_target_info *mti;
805 if (vallen != sizeof(struct mgs_target_info))
807 mti = (struct mgs_target_info *)val;
808 CDEBUG(D_MGC, "register_target %s %#x\n",
809 mti->mti_svname, mti->mti_flags);
810 rc = mgc_target_register(exp, mti);
813 if (KEY_IS("set_fs")) {
814 struct super_block *sb = (struct super_block *)val;
815 struct lustre_sb_info *lsi;
816 if (vallen != sizeof(struct super_block))
819 rc = mgc_fs_setup(exp->exp_obd, sb, lsi->lsi_srv_mnt);
821 CERROR("set_fs got %d\n", rc);
825 if (KEY_IS("clear_fs")) {
828 rc = mgc_fs_cleanup(exp->exp_obd);
830 CERROR("clear_fs got %d\n", rc);
838 static int mgc_import_event(struct obd_device *obd,
839 struct obd_import *imp,
840 enum obd_import_event event)
844 LASSERT(imp->imp_obd == obd);
845 CDEBUG(D_MGC, "import event %#x\n", event);
848 case IMP_EVENT_DISCON:
849 /* MGC imports should not wait for recovery */
850 ptlrpc_invalidate_import(imp);
852 case IMP_EVENT_INACTIVE:
854 case IMP_EVENT_INVALIDATE: {
855 struct ldlm_namespace *ns = obd->obd_namespace;
856 ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
859 case IMP_EVENT_ACTIVE:
860 LCONSOLE_WARN("%s: Reactivating import\n", obd->obd_name);
865 CERROR("Unknown import event %#x\n", event);
871 static int mgc_llog_init(struct obd_device *obd, struct obd_llogs *llogs,
872 struct obd_device *tgt, int count,
873 struct llog_catid *logid, struct obd_uuid *uuid)
875 struct llog_ctxt *ctxt;
879 rc = llog_setup(obd, llogs, LLOG_CONFIG_ORIG_CTXT, tgt, 0, NULL,
884 rc = llog_setup(obd, llogs, LLOG_CONFIG_REPL_CTXT, tgt, 0, NULL,
887 ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT);
888 ctxt->loc_imp = obd->u.cli.cl_import;
894 static int mgc_llog_finish(struct obd_device *obd, int count)
899 rc = llog_cleanup(llog_get_context(obd, LLOG_CONFIG_REPL_CTXT));
900 rc = llog_cleanup(llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT));
905 /* identical to mgs_log_is_empty */
906 static int mgc_llog_is_empty(struct obd_device *obd, struct llog_ctxt *ctxt,
909 struct lvfs_run_ctxt saved;
910 struct llog_handle *llh;
913 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
914 rc = llog_create(ctxt, &llh, NULL, name);
916 llog_init_handle(llh, LLOG_F_IS_PLAIN, NULL);
917 rc = llog_get_size(llh);
920 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
921 /* header is record 1 */
925 static int mgc_copy_handler(struct llog_handle *llh, struct llog_rec_hdr *rec,
928 struct llog_rec_hdr local_rec = *rec;
929 struct llog_handle *local_llh = (struct llog_handle *)data;
930 char *cfg_buf = (char*) (rec + 1);
931 struct lustre_cfg *lcfg;
935 /* Append all records */
936 local_rec.lrh_len -= sizeof(*rec) + sizeof(struct llog_rec_tail);
937 rc = llog_write_rec(local_llh, &local_rec, NULL, 0,
938 (void *)cfg_buf, -1);
940 lcfg = (struct lustre_cfg *)cfg_buf;
941 CDEBUG(D_INFO, "idx=%d, rc=%d, len=%d, cmd %x %s %s\n",
942 rec->lrh_index, rc, rec->lrh_len, lcfg->lcfg_command,
943 lustre_cfg_string(lcfg, 0), lustre_cfg_string(lcfg, 1));
948 /* Copy a remote log locally */
949 static int mgc_copy_llog(struct obd_device *obd, struct llog_ctxt *rctxt,
950 struct llog_ctxt *lctxt, char *logname)
952 struct llog_handle *local_llh, *remote_llh;
953 struct obd_uuid *uuid;
958 /* Write new log to a temp name, then vfs_rename over logname
959 upon successful completion. */
961 OBD_ALLOC(temp_log, strlen(logname) + 1);
964 sprintf(temp_log, "%sT", logname);
966 /* Make sure there's no old temp log */
967 rc = llog_create(lctxt, &local_llh, NULL, temp_log);
970 rc = llog_init_handle(local_llh, LLOG_F_IS_PLAIN, NULL);
973 rc = llog_destroy(local_llh);
974 llog_free_handle(local_llh);
979 rc = llog_create(lctxt, &local_llh, NULL, temp_log);
983 /* set the log header uuid for fun */
985 obd_str2uuid(uuid, logname);
986 rc = llog_init_handle(local_llh, LLOG_F_IS_PLAIN, uuid);
989 GOTO(out_closel, rc);
991 /* open remote log */
992 rc = llog_create(rctxt, &remote_llh, NULL, logname);
994 GOTO(out_closel, rc);
995 rc = llog_init_handle(remote_llh, LLOG_F_IS_PLAIN, NULL);
997 GOTO(out_closer, rc);
999 /* Copy remote log */
1000 rc = llog_process(remote_llh, mgc_copy_handler,(void *)local_llh, NULL);
1003 rc2 = llog_close(remote_llh);
1007 rc2 = llog_close(local_llh);
1011 /* We've copied the remote log to the local temp log, now
1012 replace the old local log with the temp log. */
1014 struct client_obd *cli = &obd->u.cli;
1016 LASSERT(cli->cl_mgc_configs_dir);
1017 rc = lustre_rename(cli->cl_mgc_configs_dir, temp_log, logname);
1019 CDEBUG(D_MGC, "Copied remote log %s (%d)\n", logname, rc);
1022 CERROR("Failed to copy remote log %s (%d)\n", logname, rc);
1023 OBD_FREE(temp_log, strlen(logname) + 1);
1027 DECLARE_MUTEX(llog_process_lock);
1029 /* Get a config log from the MGS and process it.
1030 This func is called for both clients and servers. */
1031 static int mgc_process_log(struct obd_device *mgc,
1032 struct config_llog_data *cld)
1034 struct llog_ctxt *ctxt, *lctxt;
1035 struct lustre_handle lockh;
1036 struct client_obd *cli = &mgc->u.cli;
1037 struct lvfs_run_ctxt saved;
1038 struct lustre_sb_info *lsi;
1039 int rc = 0, rcl, flags = 0, must_pop = 0;
1042 if (!cld || !cld->cld_cfg.cfg_sb) {
1043 /* This should never happen */
1044 CERROR("Missing cld, aborting log update\n");
1047 if (cld->cld_stopping)
1050 OBD_FAIL_TIMEOUT(OBD_FAIL_MGC_PROCESS_LOG, 20);
1052 lsi = s2lsi(cld->cld_cfg.cfg_sb);
1054 CDEBUG(D_MGC, "Process log %s:%s from %d\n", cld->cld_logname,
1055 cld->cld_cfg.cfg_instance, cld->cld_cfg.cfg_last_idx + 1);
1057 ctxt = llog_get_context(mgc, LLOG_CONFIG_REPL_CTXT);
1059 CERROR("missing llog context\n");
1063 /* I don't want mutliple processes running process_log at once --
1064 sounds like badness. It actually might be fine, as long as
1065 we're not trying to update from the same log
1066 simultaneously (in which case we should use a per-log sem.) */
1067 down(&llog_process_lock);
1069 /* Get the cfg lock on the llog */
1070 rcl = mgc_enqueue(mgc->u.cli.cl_mgc_mgsexp, NULL, LDLM_PLAIN, NULL,
1071 LCK_CR, &flags, NULL, NULL, NULL,
1072 cld, 0, NULL, &lockh);
1074 CDEBUG(D_MGC, "Can't get cfg lock: %d\n", rcl);
1076 lctxt = llog_get_context(mgc, LLOG_CONFIG_ORIG_CTXT);
1078 /* Copy the setup log locally if we can. Don't mess around if we're
1079 running an MGS though (logs are already local). */
1080 if (lctxt && lsi && (lsi->lsi_flags & LSI_SERVER) &&
1081 (lsi->lsi_srv_mnt == cli->cl_mgc_vfsmnt) &&
1082 !IS_MGS(lsi->lsi_ldd)) {
1083 push_ctxt(&saved, &mgc->obd_lvfs_ctxt, NULL);
1086 /* Only try to copy log if we have the lock. */
1087 rc = mgc_copy_llog(mgc, ctxt, lctxt, cld->cld_logname);
1089 if (mgc_llog_is_empty(mgc, lctxt, cld->cld_logname)) {
1090 LCONSOLE_ERROR_MSG(0x13a, "Failed to get MGS "
1091 "log %s and no local copy."
1092 "\n", cld->cld_logname);
1093 GOTO(out_pop, rc = -ENOTCONN);
1095 LCONSOLE_WARN("Failed to get MGS log %s, using "
1096 "local copy.\n", cld->cld_logname);
1098 /* Now, whether we copied or not, start using the local llog.
1099 If we failed to copy, we'll start using whatever the old
1104 /* logname and instance info should be the same, so use our
1105 copy of the instance for the update. The cfg_last_idx will
1107 rc = class_config_parse_llog(ctxt, cld->cld_logname, &cld->cld_cfg);
1111 pop_ctxt(&saved, &mgc->obd_lvfs_ctxt, NULL);
1113 /* Now drop the lock so MGS can revoke it */
1115 rcl = mgc_cancel(mgc->u.cli.cl_mgc_mgsexp, NULL,
1118 CERROR("Can't drop cfg lock: %d\n", rcl);
1121 CDEBUG(D_MGC, "%s: configuration from log '%s' %sed (%d).\n",
1122 mgc->obd_name, cld->cld_logname, rc ? "fail" : "succeed", rc);
1124 up(&llog_process_lock);
1129 static int mgc_process_config(struct obd_device *obd, obd_count len, void *buf)
1131 struct lustre_cfg *lcfg = buf;
1136 switch(cmd = lcfg->lcfg_command) {
1137 case LCFG_LOV_ADD_OBD: {
1138 /* Add any new target, not just osts */
1139 struct mgs_target_info *mti;
1141 if (LUSTRE_CFG_BUFLEN(lcfg, 1) !=
1142 sizeof(struct mgs_target_info))
1143 GOTO(out, rc = -EINVAL);
1145 mti = (struct mgs_target_info *)lustre_cfg_buf(lcfg, 1);
1146 CDEBUG(D_MGC, "add_target %s %#x\n",
1147 mti->mti_svname, mti->mti_flags);
1148 rc = mgc_target_register(obd->u.cli.cl_mgc_mgsexp, mti);
1151 case LCFG_LOV_DEL_OBD:
1152 /* Remove target from the fs? */
1154 CERROR("lov_del_obd unimplemented\n");
1157 case LCFG_LOG_START: {
1158 struct config_llog_data *cld;
1159 struct config_llog_instance *cfg;
1160 struct super_block *sb;
1161 char *logname = lustre_cfg_string(lcfg, 1);
1162 cfg = (struct config_llog_instance *)lustre_cfg_buf(lcfg, 2);
1163 sb = *(struct super_block **)lustre_cfg_buf(lcfg, 3);
1165 CDEBUG(D_MGC, "parse_log %s from %d\n", logname,
1168 /* We're only called through here on the initial mount */
1169 rc = config_log_add(logname, cfg, sb);
1172 cld = config_log_find(logname, cfg);
1179 /* FIXME only set this for old logs! Right now this forces
1180 us to always skip the "inside markers" check */
1181 cld->cld_cfg.cfg_flags |= CFG_F_COMPAT146;
1183 rc = mgc_process_log(obd, cld);
1184 config_log_put(cld);
1188 case LCFG_LOG_END: {
1189 struct config_llog_instance *cfg = NULL;
1190 char *logname = lustre_cfg_string(lcfg, 1);
1191 if (lcfg->lcfg_bufcount >= 2)
1192 cfg = (struct config_llog_instance *)lustre_cfg_buf(
1194 rc = config_log_end(logname, cfg);
1198 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1199 GOTO(out, rc = -EINVAL);
1207 struct obd_ops mgc_obd_ops = {
1208 .o_owner = THIS_MODULE,
1209 .o_setup = mgc_setup,
1210 .o_precleanup = mgc_precleanup,
1211 .o_cleanup = mgc_cleanup,
1212 .o_add_conn = client_import_add_conn,
1213 .o_del_conn = client_import_del_conn,
1214 .o_connect = client_connect_import,
1215 .o_disconnect = client_disconnect_export,
1216 //.o_enqueue = mgc_enqueue,
1217 .o_cancel = mgc_cancel,
1218 //.o_iocontrol = mgc_iocontrol,
1219 .o_set_info_async = mgc_set_info_async,
1220 .o_import_event = mgc_import_event,
1221 .o_llog_init = mgc_llog_init,
1222 .o_llog_finish = mgc_llog_finish,
1223 .o_process_config = mgc_process_config,
1226 int __init mgc_init(void)
1228 return class_register_type(&mgc_obd_ops, NULL, NULL,
1229 LUSTRE_MGC_NAME, NULL);
1233 static void /*__exit*/ mgc_exit(void)
1235 class_unregister_type(LUSTRE_MGC_NAME);
1238 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
1239 MODULE_DESCRIPTION("Lustre Management Client");
1240 MODULE_LICENSE("GPL");
1242 module_init(mgc_init);
1243 module_exit(mgc_exit);