1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright 2008 Sun Microsystems, Inc. All rights reserved
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/obdclass/obd_mount.c
38 * Client/server mount routines
40 * Author: Nathan Rutman <nathan@clusterfs.com>
44 #define DEBUG_SUBSYSTEM S_CLASS
45 #define D_MOUNT D_SUPER|D_CONFIG /*|D_WARNING */
46 #define PRINT_CMD CDEBUG
47 #define PRINT_MASK D_SUPER|D_CONFIG
51 #include <lustre_fsfilt.h>
52 #include <obd_class.h>
53 #include <lustre/lustre_user.h>
54 #include <linux/version.h>
55 #include <lustre_log.h>
56 #include <lustre_disk.h>
57 #include <lustre_param.h>
59 static int (*client_fill_super)(struct super_block *sb) = NULL;
60 static void (*kill_super_cb)(struct super_block *sb) = NULL;
62 /*********** mount lookup *********/
64 DECLARE_MUTEX(lustre_mount_info_lock);
65 static CFS_LIST_HEAD(server_mount_info_list);
67 static struct lustre_mount_info *server_find_mount(const char *name)
69 struct list_head *tmp;
70 struct lustre_mount_info *lmi;
73 list_for_each(tmp, &server_mount_info_list) {
74 lmi = list_entry(tmp, struct lustre_mount_info, lmi_list_chain);
75 if (strcmp(name, lmi->lmi_name) == 0)
81 /* we must register an obd for a mount before we call the setup routine.
82 *_setup will call lustre_get_mount to get the mnt struct
83 by obd_name, since we can't pass the pointer to setup. */
84 static int server_register_mount(const char *name, struct super_block *sb,
87 struct lustre_mount_info *lmi;
94 OBD_ALLOC(lmi, sizeof(*lmi));
97 OBD_ALLOC(name_cp, strlen(name) + 1);
99 OBD_FREE(lmi, sizeof(*lmi));
102 strcpy(name_cp, name);
104 down(&lustre_mount_info_lock);
106 if (server_find_mount(name)) {
107 up(&lustre_mount_info_lock);
108 OBD_FREE(lmi, sizeof(*lmi));
109 OBD_FREE(name_cp, strlen(name) + 1);
110 CERROR("Already registered %s\n", name);
113 lmi->lmi_name = name_cp;
116 list_add(&lmi->lmi_list_chain, &server_mount_info_list);
118 up(&lustre_mount_info_lock);
120 CDEBUG(D_MOUNT, "reg_mnt %p from %s, vfscount=%d\n",
121 lmi->lmi_mnt, name, atomic_read(&lmi->lmi_mnt->mnt_count));
126 /* when an obd no longer needs a mount */
127 static int server_deregister_mount(const char *name)
129 struct lustre_mount_info *lmi;
132 down(&lustre_mount_info_lock);
133 lmi = server_find_mount(name);
135 up(&lustre_mount_info_lock);
136 CERROR("%s not registered\n", name);
140 CDEBUG(D_MOUNT, "dereg_mnt %p from %s, vfscount=%d\n",
141 lmi->lmi_mnt, name, atomic_read(&lmi->lmi_mnt->mnt_count));
143 OBD_FREE(lmi->lmi_name, strlen(lmi->lmi_name) + 1);
144 list_del(&lmi->lmi_list_chain);
145 OBD_FREE(lmi, sizeof(*lmi));
146 up(&lustre_mount_info_lock);
151 /* obd's look up a registered mount using their obdname. This is just
152 for initial obd setup to find the mount struct. It should not be
153 called every time you want to mntget. */
154 struct lustre_mount_info *server_get_mount(const char *name)
156 struct lustre_mount_info *lmi;
157 struct lustre_sb_info *lsi;
160 down(&lustre_mount_info_lock);
161 lmi = server_find_mount(name);
162 up(&lustre_mount_info_lock);
164 CERROR("Can't find mount for %s\n", name);
167 lsi = s2lsi(lmi->lmi_sb);
168 mntget(lmi->lmi_mnt);
169 atomic_inc(&lsi->lsi_mounts);
171 CDEBUG(D_MOUNT, "get_mnt %p from %s, refs=%d, vfscount=%d\n",
172 lmi->lmi_mnt, name, atomic_read(&lsi->lsi_mounts),
173 atomic_read(&lmi->lmi_mnt->mnt_count));
179 * Used by mdt to get mount_info from obdname.
180 * There are no blocking when using the mount_info.
181 * Do not use server_get_mount for this purpose.
183 struct lustre_mount_info *server_get_mount_2(const char *name)
185 struct lustre_mount_info *lmi;
188 down(&lustre_mount_info_lock);
189 lmi = server_find_mount(name);
190 up(&lustre_mount_info_lock);
192 CERROR("Can't find mount for %s\n", name);
197 static void unlock_mntput(struct vfsmount *mnt)
199 if (kernel_locked()) {
208 static int lustre_put_lsi(struct super_block *sb);
210 /* to be called from obd_cleanup methods */
211 int server_put_mount(const char *name, struct vfsmount *mnt)
213 struct lustre_mount_info *lmi;
214 struct lustre_sb_info *lsi;
215 int count = atomic_read(&mnt->mnt_count) - 1;
218 /* This might be the last one, can't deref after this */
221 down(&lustre_mount_info_lock);
222 lmi = server_find_mount(name);
223 up(&lustre_mount_info_lock);
225 CERROR("Can't find mount for %s\n", name);
228 lsi = s2lsi(lmi->lmi_sb);
229 LASSERT(lmi->lmi_mnt == mnt);
231 CDEBUG(D_MOUNT, "put_mnt %p from %s, refs=%d, vfscount=%d\n",
232 lmi->lmi_mnt, name, atomic_read(&lsi->lsi_mounts), count);
234 if (lustre_put_lsi(lmi->lmi_sb)) {
235 CDEBUG(D_MOUNT, "Last put of mnt %p from %s, vfscount=%d\n",
236 lmi->lmi_mnt, name, count);
237 /* last mount is the One True Mount */
239 CERROR("%s: mount busy, vfscount=%d!\n", name, count);
242 /* this obd should never need the mount again */
243 server_deregister_mount(name);
248 /* Corresponding to server_get_mount_2 */
249 int server_put_mount_2(const char *name, struct vfsmount *mnt)
255 /******* mount helper utilities *********/
258 static void ldd_print(struct lustre_disk_data *ldd)
260 PRINT_CMD(PRINT_MASK, " disk data:\n");
261 PRINT_CMD(PRINT_MASK, "server: %s\n", ldd->ldd_svname);
262 PRINT_CMD(PRINT_MASK, "uuid: %s\n", (char *)ldd->ldd_uuid);
263 PRINT_CMD(PRINT_MASK, "fs: %s\n", ldd->ldd_fsname);
264 PRINT_CMD(PRINT_MASK, "index: %04x\n", ldd->ldd_svindex);
265 PRINT_CMD(PRINT_MASK, "config: %d\n", ldd->ldd_config_ver);
266 PRINT_CMD(PRINT_MASK, "flags: %#x\n", ldd->ldd_flags);
267 PRINT_CMD(PRINT_MASK, "diskfs: %s\n", MT_STR(ldd));
268 PRINT_CMD(PRINT_MASK, "options: %s\n", ldd->ldd_mount_opts);
269 PRINT_CMD(PRINT_MASK, "params: %s\n", ldd->ldd_params);
270 PRINT_CMD(PRINT_MASK, "comment: %s\n", ldd->ldd_userdata);
274 static int ldd_parse(struct lvfs_run_ctxt *mount_ctxt,
275 struct lustre_disk_data *ldd)
277 struct lvfs_run_ctxt saved;
284 push_ctxt(&saved, mount_ctxt, NULL);
286 file = filp_open(MOUNT_DATA_FILE, O_RDONLY, 0644);
289 CERROR("cannot open %s: rc = %d\n", MOUNT_DATA_FILE, rc);
293 len = i_size_read(file->f_dentry->d_inode);
294 CDEBUG(D_MOUNT, "Have %s, size %lu\n", MOUNT_DATA_FILE, len);
295 if (len != sizeof(*ldd)) {
296 CERROR("disk data size does not match: see %lu expect "LPSZ"\n",
298 GOTO(out_close, rc = -EINVAL);
301 rc = lustre_fread(file, ldd, len, &off);
303 CERROR("error reading %s: read %d of %lu\n",
304 MOUNT_DATA_FILE, rc, len);
305 GOTO(out_close, rc = -EINVAL);
309 if (ldd->ldd_magic != LDD_MAGIC) {
310 /* FIXME add swabbing support */
311 CERROR("Bad magic in %s: %x!=%x\n", MOUNT_DATA_FILE,
312 ldd->ldd_magic, LDD_MAGIC);
313 GOTO(out_close, rc = -EINVAL);
316 if (ldd->ldd_feature_incompat & ~LDD_INCOMPAT_SUPP) {
317 CERROR("%s: unsupported incompat filesystem feature(s) %x\n",
319 ldd->ldd_feature_incompat & ~LDD_INCOMPAT_SUPP);
320 GOTO(out_close, rc = -EINVAL);
322 if (ldd->ldd_feature_rocompat & ~LDD_ROCOMPAT_SUPP) {
323 CERROR("%s: unsupported read-only filesystem feature(s) %x\n",
325 ldd->ldd_feature_rocompat & ~LDD_ROCOMPAT_SUPP);
326 /* Do something like remount filesystem read-only */
327 GOTO(out_close, rc = -EINVAL);
333 pop_ctxt(&saved, mount_ctxt, NULL);
337 static int ldd_write(struct lvfs_run_ctxt *mount_ctxt,
338 struct lustre_disk_data *ldd)
340 struct lvfs_run_ctxt saved;
343 unsigned long len = sizeof(struct lustre_disk_data);
347 LASSERT(ldd->ldd_magic == LDD_MAGIC);
349 ldd->ldd_config_ver++;
351 push_ctxt(&saved, mount_ctxt, NULL);
353 file = filp_open(MOUNT_DATA_FILE, O_RDWR, 0644);
356 CERROR("cannot open %s: rc = %d\n", MOUNT_DATA_FILE, rc);
360 rc = lustre_fwrite(file, ldd, len, &off);
362 CERROR("error writing %s: read %d of %lu\n",
363 MOUNT_DATA_FILE, rc, len);
364 GOTO(out_close, rc = -EINVAL);
372 pop_ctxt(&saved, mount_ctxt, NULL);
377 /**************** config llog ********************/
379 /* Get a config log from the MGS and process it.
380 This func is called for both clients and servers.
381 Continue to process new statements appended to the logs
382 (whenever the config lock is revoked) until lustre_end_log
384 int lustre_process_log(struct super_block *sb, char *logname,
385 struct config_llog_instance *cfg)
387 struct lustre_cfg *lcfg;
388 struct lustre_cfg_bufs bufs;
389 struct lustre_sb_info *lsi = s2lsi(sb);
390 struct obd_device *mgc = lsi->lsi_mgc;
397 /* mgc_process_config */
398 lustre_cfg_bufs_reset(&bufs, mgc->obd_name);
399 lustre_cfg_bufs_set_string(&bufs, 1, logname);
400 lustre_cfg_bufs_set(&bufs, 2, cfg, sizeof(*cfg));
401 lustre_cfg_bufs_set(&bufs, 3, &sb, sizeof(sb));
402 lcfg = lustre_cfg_new(LCFG_LOG_START, &bufs);
403 rc = obd_process_config(mgc, sizeof(*lcfg), lcfg);
404 lustre_cfg_free(lcfg);
407 LCONSOLE_ERROR_MSG(0x15b, "%s: The configuration from log '%s'"
408 "failed from the MGS (%d). Make sure this "
409 "client and the MGS are running compatible "
410 "versions of Lustre.\n",
411 mgc->obd_name, logname, rc);
414 LCONSOLE_ERROR_MSG(0x15c, "%s: The configuration from log '%s' "
415 "failed (%d). This may be the result of "
416 "communication errors between this node and "
417 "the MGS, a bad configuration, or other "
418 "errors. See the syslog for more "
419 "information.\n", mgc->obd_name, logname,
422 /* class_obd_list(); */
426 /* Stop watching this config log for updates */
427 int lustre_end_log(struct super_block *sb, char *logname,
428 struct config_llog_instance *cfg)
430 struct lustre_cfg *lcfg;
431 struct lustre_cfg_bufs bufs;
432 struct lustre_sb_info *lsi = s2lsi(sb);
433 struct obd_device *mgc = lsi->lsi_mgc;
440 /* mgc_process_config */
441 lustre_cfg_bufs_reset(&bufs, mgc->obd_name);
442 lustre_cfg_bufs_set_string(&bufs, 1, logname);
444 lustre_cfg_bufs_set(&bufs, 2, cfg, sizeof(*cfg));
445 lcfg = lustre_cfg_new(LCFG_LOG_END, &bufs);
446 rc = obd_process_config(mgc, sizeof(*lcfg), lcfg);
447 lustre_cfg_free(lcfg);
451 /**************** obd start *******************/
453 int do_lcfg(char *cfgname, lnet_nid_t nid, int cmd,
454 char *s1, char *s2, char *s3, char *s4)
456 struct lustre_cfg_bufs bufs;
457 struct lustre_cfg * lcfg = NULL;
460 CDEBUG(D_TRACE, "lcfg %s %#x %s %s %s %s\n", cfgname,
461 cmd, s1, s2, s3, s4);
463 lustre_cfg_bufs_reset(&bufs, cfgname);
465 lustre_cfg_bufs_set_string(&bufs, 1, s1);
467 lustre_cfg_bufs_set_string(&bufs, 2, s2);
469 lustre_cfg_bufs_set_string(&bufs, 3, s3);
471 lustre_cfg_bufs_set_string(&bufs, 4, s4);
473 lcfg = lustre_cfg_new(cmd, &bufs);
474 lcfg->lcfg_nid = nid;
475 rc = class_process_config(lcfg);
476 lustre_cfg_free(lcfg);
480 static int lustre_start_simple(char *obdname, char *type, char *uuid,
484 CDEBUG(D_MOUNT, "Starting obd %s (typ=%s)\n", obdname, type);
486 rc = do_lcfg(obdname, 0, LCFG_ATTACH, type, uuid, 0, 0);
488 CERROR("%s attach error %d\n", obdname, rc);
491 rc = do_lcfg(obdname, 0, LCFG_SETUP, s1, s2, 0, 0);
493 CERROR("%s setup error %d\n", obdname, rc);
494 do_lcfg(obdname, 0, LCFG_DETACH, 0, 0, 0, 0);
499 /* Set up a MGS to serve startup logs */
500 static int server_start_mgs(struct super_block *sb)
502 struct lustre_sb_info *lsi = s2lsi(sb);
503 struct vfsmount *mnt = lsi->lsi_srv_mnt;
504 struct lustre_mount_info *lmi;
509 /* It is impossible to have more than 1 MGS per node, since
510 MGC wouldn't know which to connect to */
511 lmi = server_find_mount(LUSTRE_MGS_OBDNAME);
513 lsi = s2lsi(lmi->lmi_sb);
514 LCONSOLE_ERROR_MSG(0x15d, "The MGS service was already started"
516 lsi->lsi_ldd->ldd_svname);
520 CDEBUG(D_CONFIG, "Start MGS service %s\n", LUSTRE_MGS_OBDNAME);
522 rc = server_register_mount(LUSTRE_MGS_OBDNAME, sb, mnt);
525 ((rc = lustre_start_simple(LUSTRE_MGS_OBDNAME, LUSTRE_MGS_NAME,
526 LUSTRE_MGS_OBDNAME, 0, 0))))
527 server_deregister_mount(LUSTRE_MGS_OBDNAME);
530 LCONSOLE_ERROR_MSG(0x15e, "Failed to start MGS '%s' (%d). "
531 "Is the 'mgs' module loaded?\n",
532 LUSTRE_MGS_OBDNAME, rc);
536 static int server_stop_mgs(struct super_block *sb)
538 struct obd_device *obd;
542 CDEBUG(D_MOUNT, "Stop MGS service %s\n", LUSTRE_MGS_OBDNAME);
544 /* There better be only one MGS */
545 obd = class_name2obd(LUSTRE_MGS_OBDNAME);
547 CDEBUG(D_CONFIG, "mgs %s not running\n", LUSTRE_MGS_OBDNAME);
551 /* The MGS should always stop when we say so */
553 rc = class_manual_cleanup(obd);
557 DECLARE_MUTEX(mgc_start_lock);
559 /** Set up a mgc obd to process startup logs
561 * \param sb [in] super block of the mgc obd
563 * \retval 0 success, otherwise error code
565 static int lustre_start_mgc(struct super_block *sb)
567 struct lustre_handle mgc_conn = {0, };
568 struct obd_connect_data *data = NULL;
569 struct lustre_sb_info *lsi = s2lsi(sb);
570 struct obd_device *obd;
571 struct obd_export *exp;
572 struct obd_uuid *uuid;
575 char *mgcname, *niduuid;
578 int rc = 0, i = 0, j, len;
581 LASSERT(lsi->lsi_lmd);
583 /* Find the first non-lo MGS nid for our MGC name */
584 if (lsi->lsi_flags & LSI_SERVER) {
585 ptr = lsi->lsi_ldd->ldd_params;
586 /* Use mgsnode= nids */
587 if ((class_find_param(ptr, PARAM_MGSNODE, &ptr) == 0) &&
588 (class_parse_nid(ptr, &nid, &ptr) == 0)) {
590 } else if (IS_MGS(lsi->lsi_ldd)) {
591 lnet_process_id_t id;
592 while ((rc = LNetGetId(i++, &id)) != -ENOENT) {
593 if (LNET_NETTYP(LNET_NIDNET(id.nid)) == LOLND)
600 } else { /* client */
601 /* Use nids from mount line: uml1,1@elan:uml2,2@elan:/lustre */
602 ptr = lsi->lsi_lmd->lmd_dev;
603 if (class_parse_nid(ptr, &nid, &ptr) == 0)
607 CERROR("No valid MGS nids found.\n");
611 len = strlen(LUSTRE_MGC_OBDNAME) + strlen(libcfs_nid2str(nid)) + 1;
612 OBD_ALLOC(mgcname, len);
613 OBD_ALLOC(niduuid, len + 2);
614 if (!mgcname || !niduuid)
615 GOTO(out_free, rc = -ENOMEM);
616 sprintf(mgcname, "%s%s", LUSTRE_MGC_OBDNAME, libcfs_nid2str(nid));
618 mutex_down(&mgc_start_lock);
620 obd = class_name2obd(mgcname);
621 if (obd && !obd->obd_stopping) {
622 /* Re-using an existing MGC */
623 atomic_inc(&obd->u.cli.cl_mgc_refcount);
626 /* If we are restarting the MGS, don't try to keep the MGC's
627 old connection, or registration will fail. */
628 if ((lsi->lsi_flags & LSI_SERVER) && IS_MGS(lsi->lsi_ldd)) {
629 CDEBUG(D_MOUNT, "New MGS with live MGC\n");
633 /* Try all connections, but only once (again).
634 We don't want to block another target from starting
635 (using its local copy of the log), but we do want to connect
636 if at all possible. */
638 CDEBUG(D_MOUNT, "%s: Set MGC reconnect %d\n", mgcname,recov_bk);
639 rc = obd_set_info_async(obd->obd_self_export,
640 sizeof(KEY_INIT_RECOV_BACKUP),
641 KEY_INIT_RECOV_BACKUP,
642 sizeof(recov_bk), &recov_bk, NULL);
646 CDEBUG(D_MOUNT, "Start MGC '%s'\n", mgcname);
648 /* Add the primary nids for the MGS */
650 sprintf(niduuid, "%s_%x", mgcname, i);
651 if (lsi->lsi_flags & LSI_SERVER) {
652 ptr = lsi->lsi_ldd->ldd_params;
653 if (IS_MGS(lsi->lsi_ldd)) {
654 /* Use local nids (including LO) */
655 lnet_process_id_t id;
656 while ((rc = LNetGetId(i++, &id)) != -ENOENT) {
657 rc = do_lcfg(mgcname, id.nid,
658 LCFG_ADD_UUID, niduuid, 0,0,0);
661 /* Use mgsnode= nids */
662 if (class_find_param(ptr, PARAM_MGSNODE, &ptr) != 0) {
663 CERROR("No MGS nids given.\n");
664 GOTO(out_free, rc = -EINVAL);
666 while (class_parse_nid(ptr, &nid, &ptr) == 0) {
667 rc = do_lcfg(mgcname, nid,
668 LCFG_ADD_UUID, niduuid, 0,0,0);
672 } else { /* client */
673 /* Use nids from mount line: uml1,1@elan:uml2,2@elan:/lustre */
674 ptr = lsi->lsi_lmd->lmd_dev;
675 while (class_parse_nid(ptr, &nid, &ptr) == 0) {
676 rc = do_lcfg(mgcname, nid,
677 LCFG_ADD_UUID, niduuid, 0,0,0);
679 /* Stop at the first failover nid */
685 CERROR("No valid MGS nids found.\n");
686 GOTO(out_free, rc = -EINVAL);
688 lsi->lsi_lmd->lmd_mgs_failnodes = 1;
690 /* Random uuid for MGC allows easier reconnects */
692 ll_generate_random_uuid(uuidc);
693 class_uuid_unparse(uuidc, uuid);
696 rc = lustre_start_simple(mgcname, LUSTRE_MGC_NAME,
697 (char *)uuid->uuid, LUSTRE_MGS_OBDNAME,
703 /* Add any failover MGS nids */
705 while ((*ptr == ':' ||
706 class_find_param(ptr, PARAM_MGSNODE, &ptr) == 0)) {
707 /* New failover node */
708 sprintf(niduuid, "%s_%x", mgcname, i);
710 while (class_parse_nid(ptr, &nid, &ptr) == 0) {
712 rc = do_lcfg(mgcname, nid,
713 LCFG_ADD_UUID, niduuid, 0,0,0);
718 rc = do_lcfg(mgcname, 0, LCFG_ADD_CONN,
726 lsi->lsi_lmd->lmd_mgs_failnodes = i;
728 obd = class_name2obd(mgcname);
730 CERROR("Can't find mgcobd %s\n", mgcname);
731 GOTO(out_free, rc = -ENOTCONN);
734 /* Keep a refcount of servers/clients who started with "mount",
735 so we know when we can get rid of the mgc. */
736 atomic_set(&obd->u.cli.cl_mgc_refcount, 1);
738 /* Try all connections, but only once. */
740 rc = obd_set_info_async(obd->obd_self_export,
741 sizeof(KEY_INIT_RECOV_BACKUP),
742 KEY_INIT_RECOV_BACKUP,
743 sizeof(recov_bk), &recov_bk, NULL);
746 CWARN("can't set %s %d\n", KEY_INIT_RECOV_BACKUP, rc);
747 /* We connect to the MGS at setup, and don't disconnect until cleanup */
750 GOTO(out, rc = -ENOMEM);
751 data->ocd_connect_flags = OBD_CONNECT_VERSION | OBD_CONNECT_FID |
753 data->ocd_version = LUSTRE_VERSION_CODE;
754 rc = obd_connect(NULL, &mgc_conn, obd, &(obd->obd_uuid), data, NULL);
757 CERROR("connect failed %d\n", rc);
761 exp = class_conn2export(&mgc_conn);
762 obd->u.cli.cl_mgc_mgsexp = exp;
765 /* Keep the mgc info in the sb. Note that many lsi's can point
769 mutex_up(&mgc_start_lock);
772 OBD_FREE(mgcname, len);
774 OBD_FREE(niduuid, len + 2);
778 static int lustre_stop_mgc(struct super_block *sb)
780 struct lustre_sb_info *lsi = s2lsi(sb);
781 struct obd_device *obd;
782 char *niduuid = 0, *ptr = 0;
783 int i, rc = 0, len = 0;
793 mutex_down(&mgc_start_lock);
794 if (!atomic_dec_and_test(&obd->u.cli.cl_mgc_refcount)) {
795 /* This is not fatal, every client that stops
796 will call in here. */
797 CDEBUG(D_MOUNT, "mgc still has %d references.\n",
798 atomic_read(&obd->u.cli.cl_mgc_refcount));
799 GOTO(out, rc = -EBUSY);
802 /* The MGC has no recoverable data in any case.
803 * force shotdown set in umount_begin */
804 obd->obd_no_recov = 1;
806 if (obd->u.cli.cl_mgc_mgsexp) {
807 /* An error is not fatal, if we are unable to send the
808 disconnect mgs ping evictor cleans up the export */
809 rc = obd_disconnect(obd->u.cli.cl_mgc_mgsexp);
811 CDEBUG(D_MOUNT, "disconnect failed %d\n", rc);
814 /* Save the obdname for cleaning the nid uuids, which are
816 len = strlen(obd->obd_name) + 6;
817 OBD_ALLOC(niduuid, len);
819 strcpy(niduuid, obd->obd_name);
820 ptr = niduuid + strlen(niduuid);
823 rc = class_manual_cleanup(obd);
827 /* Clean the nid uuids */
830 for (i = 0; i < lsi->lsi_lmd->lmd_mgs_failnodes; i++) {
831 sprintf(ptr, "_%x", i);
832 rc = do_lcfg(LUSTRE_MGC_OBDNAME, 0, LCFG_DEL_UUID,
835 CERROR("del MDC UUID %s failed: rc = %d\n",
838 OBD_FREE(niduuid, len);
839 /* class_import_put will get rid of the additional connections */
842 mutex_up(&mgc_start_lock);
846 /* Since there's only one mgc per node, we have to change it's fs to get
847 access to the right disk. */
848 static int server_mgc_set_fs(struct obd_device *mgc, struct super_block *sb)
850 struct lustre_sb_info *lsi = s2lsi(sb);
854 CDEBUG(D_MOUNT, "Set mgc disk for %s\n", lsi->lsi_lmd->lmd_dev);
856 /* cl_mgc_sem in mgc insures we sleep if the mgc_fs is busy */
857 rc = obd_set_info_async(mgc->obd_self_export,
858 sizeof(KEY_SET_FS), KEY_SET_FS,
859 sizeof(*sb), sb, NULL);
861 CERROR("can't set_fs %d\n", rc);
867 static int server_mgc_clear_fs(struct obd_device *mgc)
872 CDEBUG(D_MOUNT, "Unassign mgc disk\n");
874 rc = obd_set_info_async(mgc->obd_self_export,
875 sizeof(KEY_CLEAR_FS), KEY_CLEAR_FS,
880 DECLARE_MUTEX(server_start_lock);
882 /* Stop MDS/OSS if nobody is using them */
883 static int server_stop_servers(int lddflags, int lsiflags)
885 struct obd_device *obd = NULL;
886 struct obd_type *type = NULL;
890 mutex_down(&server_start_lock);
892 /* Either an MDT or an OST or neither */
893 /* if this was an MDT, and there are no more MDT's, clean up the MDS */
894 if ((lddflags & LDD_F_SV_TYPE_MDT) &&
895 (obd = class_name2obd(LUSTRE_MDS_OBDNAME))) {
896 /*FIXME pre-rename, should eventually be LUSTRE_MDT_NAME*/
897 type = class_search_type(LUSTRE_MDS_NAME);
899 /* if this was an OST, and there are no more OST's, clean up the OSS */
900 if ((lddflags & LDD_F_SV_TYPE_OST) &&
901 (obd = class_name2obd(LUSTRE_OSS_OBDNAME))) {
902 type = class_search_type(LUSTRE_OST_NAME);
905 if (obd && (!type || !type->typ_refcnt)) {
908 /* obd_fail doesn't mean much on a server obd */
909 err = class_manual_cleanup(obd);
914 mutex_up(&server_start_lock);
919 int server_mti_print(char *title, struct mgs_target_info *mti)
921 PRINT_CMD(PRINT_MASK, "mti %s\n", title);
922 PRINT_CMD(PRINT_MASK, "server: %s\n", mti->mti_svname);
923 PRINT_CMD(PRINT_MASK, "fs: %s\n", mti->mti_fsname);
924 PRINT_CMD(PRINT_MASK, "uuid: %s\n", mti->mti_uuid);
925 PRINT_CMD(PRINT_MASK, "ver: %d flags: %#x\n",
926 mti->mti_config_ver, mti->mti_flags);
930 static int server_sb2mti(struct super_block *sb, struct mgs_target_info *mti)
932 struct lustre_sb_info *lsi = s2lsi(sb);
933 struct lustre_disk_data *ldd = lsi->lsi_ldd;
934 lnet_process_id_t id;
938 if (!(lsi->lsi_flags & LSI_SERVER))
941 strncpy(mti->mti_fsname, ldd->ldd_fsname,
942 sizeof(mti->mti_fsname));
943 strncpy(mti->mti_svname, ldd->ldd_svname,
944 sizeof(mti->mti_svname));
946 mti->mti_nid_count = 0;
947 while (LNetGetId(i++, &id) != -ENOENT) {
948 if (LNET_NETTYP(LNET_NIDNET(id.nid)) == LOLND)
950 mti->mti_nids[mti->mti_nid_count] = id.nid;
951 mti->mti_nid_count++;
952 if (mti->mti_nid_count >= MTI_NIDS_MAX) {
953 CWARN("Only using first %d nids for %s\n",
954 mti->mti_nid_count, mti->mti_svname);
959 mti->mti_lustre_ver = LUSTRE_VERSION_CODE;
960 mti->mti_config_ver = 0;
961 mti->mti_flags = ldd->ldd_flags;
962 mti->mti_stripe_index = ldd->ldd_svindex;
963 memcpy(mti->mti_uuid, ldd->ldd_uuid, sizeof(mti->mti_uuid));
964 if (strlen(ldd->ldd_params) > sizeof(mti->mti_params)) {
965 CERROR("params too big for mti\n");
968 memcpy(mti->mti_params, ldd->ldd_params, sizeof(mti->mti_params));
972 /* Register an old or new target with the MGS. If needed MGS will construct
973 startup logs and assign index */
974 int server_register_target(struct super_block *sb)
976 struct lustre_sb_info *lsi = s2lsi(sb);
977 struct obd_device *mgc = lsi->lsi_mgc;
978 struct lustre_disk_data *ldd = lsi->lsi_ldd;
979 struct mgs_target_info *mti = NULL;
985 if (!(lsi->lsi_flags & LSI_SERVER))
991 rc = server_sb2mti(sb, mti);
995 CDEBUG(D_MOUNT, "Registration %s, fs=%s, %s, index=%04x, flags=%#x\n",
996 mti->mti_svname, mti->mti_fsname,
997 libcfs_nid2str(mti->mti_nids[0]), mti->mti_stripe_index,
1000 /* Register the target */
1001 /* FIXME use mgc_process_config instead */
1002 rc = obd_set_info_async(mgc->u.cli.cl_mgc_mgsexp,
1003 sizeof(KEY_REGISTER_TARGET), KEY_REGISTER_TARGET,
1004 sizeof(*mti), mti, NULL);
1008 /* Always update our flags */
1009 ldd->ldd_flags = mti->mti_flags & ~LDD_F_REWRITE_LDD;
1011 /* If this flag is set, it means the MGS wants us to change our
1012 on-disk data. (So far this means just the index.) */
1013 if (mti->mti_flags & LDD_F_REWRITE_LDD) {
1016 CDEBUG(D_MOUNT, "Changing on-disk index from %#x to %#x "
1017 "for %s\n", ldd->ldd_svindex, mti->mti_stripe_index,
1019 ldd->ldd_svindex = mti->mti_stripe_index;
1020 strncpy(ldd->ldd_svname, mti->mti_svname,
1021 sizeof(ldd->ldd_svname));
1022 /* or ldd_make_sv_name(ldd); */
1023 ldd_write(&mgc->obd_lvfs_ctxt, ldd);
1024 err = fsfilt_set_label(mgc, lsi->lsi_srv_mnt->mnt_sb,
1027 CERROR("Label set error %d\n", err);
1028 label = fsfilt_get_label(mgc, lsi->lsi_srv_mnt->mnt_sb);
1030 CDEBUG(D_MOUNT, "Disk label changed to %s\n", label);
1032 /* Flush the new ldd to disk */
1033 fsfilt_sync(mgc, lsi->lsi_srv_mnt->mnt_sb);
1043 static int server_start_targets(struct super_block *sb, struct vfsmount *mnt)
1045 struct obd_device *obd;
1046 struct lustre_sb_info *lsi = s2lsi(sb);
1047 struct config_llog_instance cfg;
1051 CDEBUG(D_MOUNT, "starting target %s\n", lsi->lsi_ldd->ldd_svname);
1054 /* If we're an MDT, make sure the global MDS is running */
1055 if (lsi->lsi_ldd->ldd_flags & LDD_F_SV_TYPE_MDT) {
1056 /* make sure the MDS is started */
1057 mutex_down(&server_start_lock);
1058 obd = class_name2obd(LUSTRE_MDS_OBDNAME);
1060 rc = lustre_start_simple(LUSTRE_MDS_OBDNAME,
1061 /* FIXME pre-rename, should eventually be LUSTRE_MDS_NAME */
1063 LUSTRE_MDS_OBDNAME"_uuid",
1066 mutex_up(&server_start_lock);
1067 CERROR("failed to start MDS: %d\n", rc);
1071 mutex_up(&server_start_lock);
1075 /* If we're an OST, make sure the global OSS is running */
1076 if (lsi->lsi_ldd->ldd_flags & LDD_F_SV_TYPE_OST) {
1077 /* make sure OSS is started */
1078 mutex_down(&server_start_lock);
1079 obd = class_name2obd(LUSTRE_OSS_OBDNAME);
1081 rc = lustre_start_simple(LUSTRE_OSS_OBDNAME,
1083 LUSTRE_OSS_OBDNAME"_uuid",
1086 mutex_up(&server_start_lock);
1087 CERROR("failed to start OSS: %d\n", rc);
1091 mutex_up(&server_start_lock);
1094 /* Set the mgc fs to our server disk. This allows the MGC
1095 to read and write configs locally. */
1096 rc = server_mgc_set_fs(lsi->lsi_mgc, sb);
1100 /* Register with MGS */
1101 rc = server_register_target(sb);
1102 if (rc && (lsi->lsi_ldd->ldd_flags &
1103 (LDD_F_NEED_INDEX | LDD_F_UPDATE | LDD_F_UPGRADE14))){
1104 CERROR("Required registration failed for %s: %d\n",
1105 lsi->lsi_ldd->ldd_svname, rc);
1107 LCONSOLE_ERROR_MSG(0x15f, "Communication error with "
1108 "the MGS. Is the MGS running?\n");
1112 if (rc == -EINVAL) {
1113 LCONSOLE_ERROR_MSG(0x160, "The MGS is refusing to allow this "
1114 "server (%s) to start. Please see messages"
1115 " on the MGS node.\n",
1116 lsi->lsi_ldd->ldd_svname);
1119 /* non-fatal error of registeration with MGS */
1121 CDEBUG(D_MOUNT, "Cannot register with MGS: %d\n", rc);
1123 /* Let the target look up the mount using the target's name
1124 (we can't pass the sb or mnt through class_process_config.) */
1125 rc = server_register_mount(lsi->lsi_ldd->ldd_svname, sb, mnt);
1129 /* Start targets using the llog named for the target */
1130 memset(&cfg, 0, sizeof(cfg));
1131 rc = lustre_process_log(sb, lsi->lsi_ldd->ldd_svname, &cfg);
1133 CERROR("failed to start server %s: %d\n",
1134 lsi->lsi_ldd->ldd_svname, rc);
1139 /* Release the mgc fs for others to use */
1140 server_mgc_clear_fs(lsi->lsi_mgc);
1143 obd = class_name2obd(lsi->lsi_ldd->ldd_svname);
1145 CERROR("no server named %s was started\n",
1146 lsi->lsi_ldd->ldd_svname);
1150 if ((lsi->lsi_lmd->lmd_flags & LMD_FLG_ABORT_RECOV) &&
1151 (OBP(obd, iocontrol))) {
1152 obd_iocontrol(OBD_IOC_ABORT_RECOVERY,
1153 obd->obd_self_export, 0, NULL, NULL);
1156 /* log has been fully processed */
1157 obd_notify(obd, NULL, OBD_NOTIFY_CONFIG, (void *)CONFIG_LOG);
1163 /***************** lustre superblock **************/
1165 struct lustre_sb_info *lustre_init_lsi(struct super_block *sb)
1167 struct lustre_sb_info *lsi = NULL;
1170 OBD_ALLOC(lsi, sizeof(*lsi));
1173 OBD_ALLOC(lsi->lsi_lmd, sizeof(*lsi->lsi_lmd));
1174 if (!lsi->lsi_lmd) {
1175 OBD_FREE(lsi, sizeof(*lsi));
1179 lsi->lsi_lmd->lmd_exclude_count = 0;
1180 s2lsi_nocast(sb) = lsi;
1181 /* we take 1 extra ref for our setup */
1182 atomic_set(&lsi->lsi_mounts, 1);
1184 /* Default umount style */
1185 lsi->lsi_flags = LSI_UMOUNT_FAILOVER;
1190 static int lustre_free_lsi(struct super_block *sb)
1192 struct lustre_sb_info *lsi = s2lsi(sb);
1198 CDEBUG(D_MOUNT, "Freeing lsi\n");
1200 /* someone didn't call server_put_mount. */
1201 LASSERT(atomic_read(&lsi->lsi_mounts) == 0);
1203 if (lsi->lsi_ldd != NULL)
1204 OBD_FREE(lsi->lsi_ldd, sizeof(*lsi->lsi_ldd));
1206 if (lsi->lsi_lmd != NULL) {
1207 if (lsi->lsi_lmd->lmd_dev != NULL)
1208 OBD_FREE(lsi->lsi_lmd->lmd_dev,
1209 strlen(lsi->lsi_lmd->lmd_dev) + 1);
1210 if (lsi->lsi_lmd->lmd_profile != NULL)
1211 OBD_FREE(lsi->lsi_lmd->lmd_profile,
1212 strlen(lsi->lsi_lmd->lmd_profile) + 1);
1213 if (lsi->lsi_lmd->lmd_opts != NULL)
1214 OBD_FREE(lsi->lsi_lmd->lmd_opts,
1215 strlen(lsi->lsi_lmd->lmd_opts) + 1);
1216 if (lsi->lsi_lmd->lmd_exclude_count)
1217 OBD_FREE(lsi->lsi_lmd->lmd_exclude,
1218 sizeof(lsi->lsi_lmd->lmd_exclude[0]) *
1219 lsi->lsi_lmd->lmd_exclude_count);
1220 OBD_FREE(lsi->lsi_lmd, sizeof(*lsi->lsi_lmd));
1223 LASSERT(lsi->lsi_llsbi == NULL);
1224 OBD_FREE(lsi, sizeof(*lsi));
1225 s2lsi_nocast(sb) = NULL;
1230 /* The lsi has one reference for every server that is using the disk -
1231 e.g. MDT, MGS, and potentially MGC */
1232 static int lustre_put_lsi(struct super_block *sb)
1234 struct lustre_sb_info *lsi = s2lsi(sb);
1239 CDEBUG(D_MOUNT, "put %p %d\n", sb, atomic_read(&lsi->lsi_mounts));
1241 if (atomic_dec_and_test(&lsi->lsi_mounts)) {
1242 lustre_free_lsi(sb);
1248 /*************** server mount ******************/
1250 /* Kernel mount using mount options in MOUNT_DATA_FILE */
1251 static struct vfsmount *server_kernel_mount(struct super_block *sb)
1253 struct lvfs_run_ctxt mount_ctxt;
1254 struct lustre_sb_info *lsi = s2lsi(sb);
1255 struct lustre_disk_data *ldd;
1256 struct lustre_mount_data *lmd = lsi->lsi_lmd;
1257 struct vfsmount *mnt;
1258 char *options = NULL;
1259 unsigned long page, s_flags;
1260 struct page *__page;
1264 OBD_ALLOC(ldd, sizeof(*ldd));
1266 RETURN(ERR_PTR(-ENOMEM));
1268 /* In the past, we have always used flags = 0.
1269 Note ext3/ldiskfs can't be mounted ro. */
1270 s_flags = sb->s_flags;
1272 /* allocate memory for options */
1273 OBD_PAGE_ALLOC(__page, CFS_ALLOC_STD);
1275 GOTO(out_free, rc = -ENOMEM);
1276 page = (unsigned long)cfs_page_address(__page);
1277 options = (char *)page;
1278 memset(options, 0, CFS_PAGE_SIZE);
1280 /* mount-line options must be added for pre-mount because it may
1281 * contain mount options such as journal_dev which are required
1282 * to mount successfuly the underlying filesystem */
1283 if (lmd->lmd_opts && (*(lmd->lmd_opts) != 0))
1284 strncat(options, lmd->lmd_opts, CFS_PAGE_SIZE - 1);
1286 /* Pre-mount ldiskfs to read the MOUNT_DATA_FILE */
1287 CDEBUG(D_MOUNT, "Pre-mount ldiskfs %s\n", lmd->lmd_dev);
1288 mnt = ll_kern_mount("ldiskfs", s_flags, lmd->lmd_dev, (void *)options);
1291 CERROR("premount %s:%#lx ldiskfs failed: %d "
1292 "Is the ldiskfs module available?\n",
1293 lmd->lmd_dev, s_flags, rc );
1297 OBD_SET_CTXT_MAGIC(&mount_ctxt);
1298 mount_ctxt.pwdmnt = mnt;
1299 mount_ctxt.pwd = mnt->mnt_root;
1300 mount_ctxt.fs = get_ds();
1302 rc = ldd_parse(&mount_ctxt, ldd);
1306 CERROR("premount parse options failed: rc = %d\n", rc);
1310 /* Done with our pre-mount, now do the real mount. */
1312 /* Glom up mount options */
1313 memset(options, 0, CFS_PAGE_SIZE);
1314 strncpy(options, ldd->ldd_mount_opts, CFS_PAGE_SIZE - 2);
1316 /* Add in any mount-line options */
1317 if (lmd->lmd_opts && (*(lmd->lmd_opts) != 0)) {
1318 int len = CFS_PAGE_SIZE - strlen(options) - 2;
1320 strcat(options, ",");
1321 strncat(options, lmd->lmd_opts, len);
1324 /* Special permanent mount flags */
1326 s_flags |= MS_NOATIME | MS_NODIRATIME;
1328 CDEBUG(D_MOUNT, "kern_mount: %s %s %s\n",
1329 MT_STR(ldd), lmd->lmd_dev, options);
1330 mnt = ll_kern_mount(MT_STR(ldd), s_flags, lmd->lmd_dev,
1334 CERROR("ll_kern_mount failed: rc = %d\n", rc);
1338 OBD_PAGE_FREE(__page);
1339 lsi->lsi_ldd = ldd; /* freed at lsi cleanup */
1340 CDEBUG(D_SUPER, "%s: mnt = %p\n", lmd->lmd_dev, mnt);
1345 OBD_PAGE_FREE(__page);
1346 OBD_FREE(ldd, sizeof(*ldd));
1347 lsi->lsi_ldd = NULL;
1348 RETURN(ERR_PTR(rc));
1351 static void server_wait_finished(struct vfsmount *mnt)
1353 wait_queue_head_t waitq;
1354 struct l_wait_info lwi;
1357 init_waitqueue_head(&waitq);
1359 while ((atomic_read(&mnt->mnt_count) > 1) && (retries > 0)) {
1360 LCONSOLE_WARN("Mount still busy with %d refs, waiting for "
1362 atomic_read(&mnt->mnt_count), retries);
1364 /* Wait for a bit */
1366 lwi = LWI_TIMEOUT(5 * HZ, NULL, NULL);
1367 l_wait_event(waitq, 0, &lwi);
1369 if (atomic_read(&mnt->mnt_count) > 1) {
1370 CERROR("Mount %p is still busy (%d refs), giving up.\n",
1371 mnt, atomic_read(&mnt->mnt_count));
1375 static void server_put_super(struct super_block *sb)
1377 struct lustre_sb_info *lsi = s2lsi(sb);
1378 struct obd_device *obd;
1379 struct vfsmount *mnt = lsi->lsi_srv_mnt;
1380 char *tmpname, *extraname = NULL;
1382 int lddflags = lsi->lsi_ldd->ldd_flags;
1383 int lsiflags = lsi->lsi_flags;
1387 LASSERT(lsiflags & LSI_SERVER);
1389 tmpname_sz = strlen(lsi->lsi_ldd->ldd_svname) + 1;
1390 OBD_ALLOC(tmpname, tmpname_sz);
1391 memcpy(tmpname, lsi->lsi_ldd->ldd_svname, tmpname_sz);
1392 CDEBUG(D_MOUNT, "server put_super %s\n", tmpname);
1394 /* Stop the target */
1395 if (!(lsi->lsi_lmd->lmd_flags & LMD_FLG_NOSVC) &&
1396 (IS_MDT(lsi->lsi_ldd) || IS_OST(lsi->lsi_ldd))) {
1397 struct lustre_profile *lprof = NULL;
1399 /* tell the mgc to drop the config log */
1400 lustre_end_log(sb, lsi->lsi_ldd->ldd_svname, NULL);
1402 /* COMPAT_146 - profile may get deleted in mgc_cleanup.
1403 If there are any setup/cleanup errors, save the lov
1404 name for safety cleanup later. */
1405 lprof = class_get_profile(lsi->lsi_ldd->ldd_svname);
1406 if (lprof && lprof->lp_dt) {
1407 OBD_ALLOC(extraname, strlen(lprof->lp_dt) + 1);
1408 strcpy(extraname, lprof->lp_dt);
1411 obd = class_name2obd(lsi->lsi_ldd->ldd_svname);
1413 CDEBUG(D_MOUNT, "stopping %s\n", obd->obd_name);
1414 if (lsi->lsi_flags & LSI_UMOUNT_FAILOVER)
1416 /* We can't seem to give an error return code
1417 * to .put_super, so we better make sure we clean up! */
1419 class_manual_cleanup(obd);
1421 CERROR("no obd %s\n", lsi->lsi_ldd->ldd_svname);
1422 server_deregister_mount(lsi->lsi_ldd->ldd_svname);
1426 /* If they wanted the mgs to stop separately from the mdt, they
1427 should have put it on a different device. */
1428 if (IS_MGS(lsi->lsi_ldd)) {
1429 /* stop the mgc before the mgs so the connection gets cleaned
1431 lustre_stop_mgc(sb);
1432 /* if MDS start with --nomgs, don't stop MGS then */
1433 if (!(lsi->lsi_lmd->lmd_flags & LMD_FLG_NOMGS))
1434 server_stop_mgs(sb);
1437 /* Clean the mgc and sb */
1438 rc = lustre_common_put_super(sb);
1439 /* FIXME how can I report a failure to umount? */
1441 /* Wait for the targets to really clean up - can't exit (and let the
1442 sb get destroyed) while the mount is still in use */
1443 server_wait_finished(mnt);
1445 /* drop the One True Mount */
1448 /* Stop the servers (MDS, OSS) if no longer needed. We must wait
1449 until the target is really gone so that our type refcount check
1451 server_stop_servers(lddflags, lsiflags);
1453 /* In case of startup or cleanup err, stop related obds */
1455 obd = class_name2obd(extraname);
1457 CWARN("Cleaning orphaned obd %s\n", extraname);
1459 class_manual_cleanup(obd);
1461 OBD_FREE(extraname, strlen(extraname) + 1);
1464 LCONSOLE_WARN("server umount %s complete\n", tmpname);
1465 OBD_FREE(tmpname, tmpname_sz);
1469 #ifdef HAVE_UMOUNTBEGIN_VFSMOUNT
1470 static void server_umount_begin(struct vfsmount *vfsmnt, int flags)
1472 struct super_block *sb = vfsmnt->mnt_sb;
1474 static void server_umount_begin(struct super_block *sb)
1477 struct lustre_sb_info *lsi = s2lsi(sb);
1480 #ifdef HAVE_UMOUNTBEGIN_VFSMOUNT
1481 if (!(flags & MNT_FORCE)) {
1487 CDEBUG(D_MOUNT, "umount -f\n");
1488 /* umount = failover
1490 no third way to do non-force, non-failover */
1491 lsi->lsi_flags &= ~LSI_UMOUNT_FAILOVER;
1492 lsi->lsi_flags |= LSI_UMOUNT_FORCE;
1496 #ifndef HAVE_STATFS_DENTRY_PARAM
1497 static int server_statfs (struct super_block *sb, struct kstatfs *buf)
1500 static int server_statfs (struct dentry *dentry, struct kstatfs *buf)
1502 struct super_block *sb = dentry->d_sb;
1504 struct vfsmount *mnt = s2lsi(sb)->lsi_srv_mnt;
1507 if (mnt && mnt->mnt_sb && mnt->mnt_sb->s_op->statfs) {
1508 #ifdef HAVE_STATFS_DENTRY_PARAM
1509 int rc = mnt->mnt_sb->s_op->statfs(mnt->mnt_root, buf);
1511 int rc = mnt->mnt_sb->s_op->statfs(mnt->mnt_sb, buf);
1514 buf->f_type = sb->s_magic;
1520 buf->f_type = sb->s_magic;
1521 buf->f_bsize = sb->s_blocksize;
1527 buf->f_namelen = NAME_MAX;
1531 static struct super_operations server_ops =
1533 .put_super = server_put_super,
1534 .umount_begin = server_umount_begin, /* umount -f */
1535 .statfs = server_statfs,
1538 #define log2(n) ffz(~(n))
1539 #define LUSTRE_SUPER_MAGIC 0x0BD00BD1
1541 static int server_fill_super_common(struct super_block *sb)
1543 struct inode *root = 0;
1546 CDEBUG(D_MOUNT, "Server sb, dev=%d\n", (int)sb->s_dev);
1548 sb->s_blocksize = 4096;
1549 sb->s_blocksize_bits = log2(sb->s_blocksize);
1550 sb->s_magic = LUSTRE_SUPER_MAGIC;
1551 sb->s_maxbytes = 0; //PAGE_CACHE_MAXBYTES;
1552 sb->s_flags |= MS_RDONLY;
1553 sb->s_op = &server_ops;
1555 root = new_inode(sb);
1557 CERROR("Can't make root inode\n");
1561 /* returns -EIO for every operation */
1562 /* make_bad_inode(root); -- badness - can't umount */
1563 /* apparently we need to be a directory for the mount to finish */
1564 root->i_mode = S_IFDIR;
1566 sb->s_root = d_alloc_root(root);
1568 CERROR("Can't make root dentry\n");
1576 static int server_fill_super(struct super_block *sb)
1578 struct lustre_sb_info *lsi = s2lsi(sb);
1579 struct vfsmount *mnt;
1583 /* the One True Mount */
1584 mnt = server_kernel_mount(sb);
1587 CERROR("Unable to mount device %s: %d\n",
1588 lsi->lsi_lmd->lmd_dev, rc);
1592 lsi->lsi_srv_mnt = mnt;
1594 LASSERT(lsi->lsi_ldd);
1595 CDEBUG(D_MOUNT, "Found service %s for fs '%s' on device %s\n",
1596 lsi->lsi_ldd->ldd_svname, lsi->lsi_ldd->ldd_fsname,
1597 lsi->lsi_lmd->lmd_dev);
1599 if (class_name2obd(lsi->lsi_ldd->ldd_svname)) {
1600 LCONSOLE_ERROR_MSG(0x161, "The target named %s is already "
1601 "running. Double-mount may have compromised"
1602 " the disk journal.\n",
1603 lsi->lsi_ldd->ldd_svname);
1606 GOTO(out, rc = -EALREADY);
1609 /* start MGS before MGC */
1610 if (IS_MGS(lsi->lsi_ldd) && !(lsi->lsi_lmd->lmd_flags & LMD_FLG_NOMGS)) {
1611 rc = server_start_mgs(sb);
1616 rc = lustre_start_mgc(sb);
1620 /* Set up all obd devices for service */
1621 if (!(lsi->lsi_lmd->lmd_flags & LMD_FLG_NOSVC) &&
1622 (IS_OST(lsi->lsi_ldd) || IS_MDT(lsi->lsi_ldd))) {
1623 rc = server_start_targets(sb, mnt);
1625 CERROR("Unable to start targets: %d\n", rc);
1628 /* FIXME overmount client here,
1629 or can we just start a client log and client_fill_super on this sb?
1630 We need to make sure server_put_super gets called too - ll_put_super
1631 calls lustre_common_put_super; check there for LSI_SERVER flag,
1633 Probably should start client from new thread so we can return.
1634 Client will not finish until all servers are connected.
1635 Note - MGS-only server does NOT get a client, since there is no
1636 lustre fs associated - the MGS is for all lustre fs's */
1639 rc = server_fill_super_common(sb);
1643 LCONSOLE_WARN("Server %s on device %s has started\n",
1644 lsi->lsi_ldd->ldd_svname, lsi->lsi_lmd->lmd_dev);
1649 server_put_super(sb);
1654 /* Get the index from the obd name.
1655 rc = server type, or
1657 if endptr isn't NULL it is set to end of name */
1658 int server_name2index(char *svname, __u32 *idx, char **endptr)
1660 unsigned long index;
1662 char *dash = strchr(svname, '-');
1666 if (strncmp(dash + 1, "MDT", 3) == 0)
1667 rc = LDD_F_SV_TYPE_MDT;
1668 else if (strncmp(dash + 1, "OST", 3) == 0)
1669 rc = LDD_F_SV_TYPE_OST;
1673 index = simple_strtoul(dash + 4, endptr, 16);
1678 /*************** mount common betweeen server and client ***************/
1681 int lustre_common_put_super(struct super_block *sb)
1686 CDEBUG(D_MOUNT, "dropping sb %p\n", sb);
1688 /* Drop a ref to the MGC */
1689 rc = lustre_stop_mgc(sb);
1690 if (rc && (rc != -ENOENT)) {
1692 CERROR("Can't stop MGC: %d\n", rc);
1695 /* BUSY just means that there's some other obd that
1696 needs the mgc. Let him clean it up. */
1697 CDEBUG(D_MOUNT, "MGC still in use\n");
1699 /* Drop a ref to the mounted disk */
1705 static void lmd_print(struct lustre_mount_data *lmd)
1709 PRINT_CMD(PRINT_MASK, " mount data:\n");
1710 if (lmd_is_client(lmd))
1711 PRINT_CMD(PRINT_MASK, "profile: %s\n", lmd->lmd_profile);
1712 PRINT_CMD(PRINT_MASK, "device: %s\n", lmd->lmd_dev);
1713 PRINT_CMD(PRINT_MASK, "flags: %x\n", lmd->lmd_flags);
1715 PRINT_CMD(PRINT_MASK, "options: %s\n", lmd->lmd_opts);
1716 for (i = 0; i < lmd->lmd_exclude_count; i++) {
1717 PRINT_CMD(PRINT_MASK, "exclude %d: OST%04x\n", i,
1718 lmd->lmd_exclude[i]);
1723 /* Is this server on the exclusion list */
1724 int lustre_check_exclusion(struct super_block *sb, char *svname)
1726 struct lustre_sb_info *lsi = s2lsi(sb);
1727 struct lustre_mount_data *lmd = lsi->lsi_lmd;
1732 rc = server_name2index(svname, &index, NULL);
1733 if (rc != LDD_F_SV_TYPE_OST)
1734 /* Only exclude OSTs */
1737 CDEBUG(D_MOUNT, "Check exclusion %s (%d) in %d of %s\n", svname,
1738 index, lmd->lmd_exclude_count, lmd->lmd_dev);
1740 for(i = 0; i < lmd->lmd_exclude_count; i++) {
1741 if (index == lmd->lmd_exclude[i]) {
1742 CWARN("Excluding %s (on exclusion list)\n", svname);
1749 /* mount -v -o exclude=lustre-OST0001:lustre-OST0002 -t lustre ... */
1750 static int lmd_make_exclusion(struct lustre_mount_data *lmd, char *ptr)
1752 char *s1 = ptr, *s2;
1753 __u32 index, *exclude_list;
1757 /* The shortest an ost name can be is 8 chars: -OST0000.
1758 We don't actually know the fsname at this time, so in fact
1759 a user could specify any fsname. */
1760 devmax = strlen(ptr) / 8 + 1;
1762 /* temp storage until we figure out how many we have */
1763 OBD_ALLOC(exclude_list, sizeof(index) * devmax);
1767 /* we enter this fn pointing at the '=' */
1768 while (*s1 && *s1 != ' ' && *s1 != ',') {
1770 rc = server_name2index(s1, &index, &s2);
1772 CERROR("Can't parse server name '%s'\n", s1);
1775 if (rc == LDD_F_SV_TYPE_OST)
1776 exclude_list[lmd->lmd_exclude_count++] = index;
1778 CDEBUG(D_MOUNT, "ignoring exclude %.7s\n", s1);
1780 /* now we are pointing at ':' (next exclude)
1781 or ',' (end of excludes) */
1782 if (lmd->lmd_exclude_count >= devmax)
1785 if (rc >= 0) /* non-err */
1788 if (lmd->lmd_exclude_count) {
1789 /* permanent, freed in lustre_free_lsi */
1790 OBD_ALLOC(lmd->lmd_exclude, sizeof(index) *
1791 lmd->lmd_exclude_count);
1792 if (lmd->lmd_exclude) {
1793 memcpy(lmd->lmd_exclude, exclude_list,
1794 sizeof(index) * lmd->lmd_exclude_count);
1797 lmd->lmd_exclude_count = 0;
1800 OBD_FREE(exclude_list, sizeof(index) * devmax);
1804 /* mount -v -t lustre uml1:uml2:/lustre-client /mnt/lustre */
1805 static int lmd_parse(char *options, struct lustre_mount_data *lmd)
1807 char *s1, *s2, *devname = NULL;
1808 struct lustre_mount_data *raw = (struct lustre_mount_data *)options;
1814 LCONSOLE_ERROR_MSG(0x162, "Missing mount data: check that "
1815 "/sbin/mount.lustre is installed.\n");
1819 /* Options should be a string - try to detect old lmd data */
1820 if ((raw->lmd_magic & 0xffffff00) == (LMD_MAGIC & 0xffffff00)) {
1821 LCONSOLE_ERROR_MSG(0x163, "You're using an old version of "
1822 "/sbin/mount.lustre. Please install "
1823 "version %s\n", LUSTRE_VERSION_STRING);
1826 lmd->lmd_magic = LMD_MAGIC;
1828 /* Set default flags here */
1833 /* Skip whitespace and extra commas */
1834 while (*s1 == ' ' || *s1 == ',')
1837 /* Client options are parsed in ll_options: eg. flock,
1840 /* Parse non-ldiskfs options here. Rather than modifying
1841 ldiskfs, we just zero these out here */
1842 if (strncmp(s1, "abort_recov", 11) == 0) {
1843 lmd->lmd_flags |= LMD_FLG_ABORT_RECOV;
1845 } else if (strncmp(s1, "nosvc", 5) == 0) {
1846 lmd->lmd_flags |= LMD_FLG_NOSVC;
1848 } else if (strncmp(s1, "nomgs", 5) == 0) {
1849 lmd->lmd_flags |= LMD_FLG_NOMGS;
1851 /* ost exclusion list */
1852 } else if (strncmp(s1, "exclude=", 8) == 0) {
1853 rc = lmd_make_exclusion(lmd, s1 + 7);
1858 /* Linux 2.4 doesn't pass the device, so we stuck it at the
1859 end of the options. */
1860 else if (strncmp(s1, "device=", 7) == 0) {
1862 /* terminate options right before device. device
1863 must be the last one. */
1869 s2 = strchr(s1, ',');
1877 memmove(s1, s2, strlen(s2) + 1);
1883 LCONSOLE_ERROR_MSG(0x164, "Can't find the device name "
1884 "(need mount option 'device=...')\n");
1888 s1 = strrchr(devname, ':');
1890 lmd->lmd_flags = LMD_FLG_CLIENT;
1891 /* Remove leading /s from fsname */
1892 while (*++s1 == '/') ;
1893 /* Freed in lustre_free_lsi */
1894 OBD_ALLOC(lmd->lmd_profile, strlen(s1) + 8);
1895 if (!lmd->lmd_profile)
1897 sprintf(lmd->lmd_profile, "%s-client", s1);
1900 /* Freed in lustre_free_lsi */
1901 OBD_ALLOC(lmd->lmd_dev, strlen(devname) + 1);
1904 strcpy(lmd->lmd_dev, devname);
1906 /* Save mount options */
1907 s1 = options + strlen(options) - 1;
1908 while (s1 >= options && (*s1 == ',' || *s1 == ' '))
1910 if (*options != 0) {
1911 /* Freed in lustre_free_lsi */
1912 OBD_ALLOC(lmd->lmd_opts, strlen(options) + 1);
1915 strcpy(lmd->lmd_opts, options);
1918 lmd->lmd_magic = LMD_MAGIC;
1923 CERROR("Bad mount options %s\n", options);
1929 int lustre_fill_super(struct super_block *sb, void *data, int silent)
1931 struct lustre_mount_data *lmd;
1932 struct lustre_sb_info *lsi;
1936 CDEBUG(D_MOUNT|D_VFSTRACE, "VFS Op: sb %p\n", sb);
1938 lsi = lustre_init_lsi(sb);
1943 /* Figure out the lmd from the mount options */
1944 if (lmd_parse((char *)data, lmd)) {
1949 if (lmd_is_client(lmd)) {
1950 CDEBUG(D_MOUNT, "Mounting client %s\n", lmd->lmd_profile);
1951 if (!client_fill_super) {
1952 LCONSOLE_ERROR_MSG(0x165, "Nothing registered for "
1953 "client mount! Is the 'lustre' "
1954 "module loaded?\n");
1957 rc = lustre_start_mgc(sb);
1959 lustre_stop_mgc(sb);
1962 /* Connect and start */
1963 /* (should always be ll_fill_super) */
1964 rc = (*client_fill_super)(sb);
1965 /* c_f_s will call lustre_common_put_super on failure */
1968 CDEBUG(D_MOUNT, "Mounting server from %s\n", lmd->lmd_dev);
1969 lsi->lsi_flags |= LSI_SERVER;
1970 rc = server_fill_super(sb);
1971 /* s_f_s calls lustre_start_mgc after the mount because we need
1972 the MGS nids which are stored on disk. Plus, we may
1973 need to start the MGS first. */
1974 /* s_f_s will call server_put_super on failure */
1979 CERROR("Unable to mount %s (%d)\n",
1980 s2lsi(sb) ? lmd->lmd_dev : "", rc);
1982 CDEBUG(D_SUPER, "mount %s complete\n", lmd->lmd_dev);
1988 /* We can't call ll_fill_super by name because it lives in a module that
1989 must be loaded after this one. */
1990 void lustre_register_client_fill_super(int (*cfs)(struct super_block *sb))
1992 client_fill_super = cfs;
1995 void lustre_register_kill_super_cb(void (*cfs)(struct super_block *sb))
1997 kill_super_cb = cfs;
2000 /***************** FS registration ******************/
2002 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18))
2003 struct super_block * lustre_get_sb(struct file_system_type *fs_type,
2004 int flags, const char *devname, void * data)
2006 /* calls back in fill super */
2007 /* we could append devname= onto options (*data) here,
2008 but 2.4 doesn't get devname. So we do it in mount_lustre.c */
2009 return get_sb_nodev(fs_type, flags, data, lustre_fill_super);
2012 int lustre_get_sb(struct file_system_type *fs_type,
2013 int flags, const char *devname, void * data,
2014 struct vfsmount *mnt)
2016 /* calls back in fill super */
2017 /* we could append devname= onto options (*data) here,
2018 but 2.4 doesn't get devname. So we do it in mount_lustre.c */
2019 return get_sb_nodev(fs_type, flags, data, lustre_fill_super, mnt);
2023 void lustre_kill_super(struct super_block *sb)
2025 struct lustre_sb_info *lsi = s2lsi(sb);
2027 if (kill_super_cb && lsi &&(lsi->lsi_flags & LSI_SERVER))
2028 (*kill_super_cb)(sb);
2030 kill_anon_super(sb);
2033 struct file_system_type lustre_fs_type = {
2034 .owner = THIS_MODULE,
2036 .get_sb = lustre_get_sb,
2037 .kill_sb = lustre_kill_super,
2038 .fs_flags = FS_BINARY_MOUNTDATA | FS_REQUIRES_DEV |
2039 LL_RENAME_DOES_D_MOVE,
2042 int lustre_register_fs(void)
2044 return register_filesystem(&lustre_fs_type);
2047 int lustre_unregister_fs(void)
2049 return unregister_filesystem(&lustre_fs_type);
2052 EXPORT_SYMBOL(lustre_register_client_fill_super);
2053 EXPORT_SYMBOL(lustre_register_kill_super_cb);
2054 EXPORT_SYMBOL(lustre_common_put_super);
2055 EXPORT_SYMBOL(lustre_process_log);
2056 EXPORT_SYMBOL(lustre_end_log);
2057 EXPORT_SYMBOL(server_get_mount);
2058 EXPORT_SYMBOL(server_get_mount_2);
2059 EXPORT_SYMBOL(server_put_mount);
2060 EXPORT_SYMBOL(server_put_mount_2);
2061 EXPORT_SYMBOL(server_register_target);
2062 EXPORT_SYMBOL(server_name2index);
2063 EXPORT_SYMBOL(server_mti_print);
2064 EXPORT_SYMBOL(do_lcfg);