1 /*
2 * GPL HEADER START
3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
19 *
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
22 * have any questions.
23 *
24 * GPL HEADER END
25 */
26 /*
27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
29 *
30 * Copyright (c) 2011, 2012, Intel Corporation.
31 */
32 /*
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
35 *
36 * lustre/obdclass/obd_mount.c
37 *
38 * Client mount routines
39 *
40 * Author: Nathan Rutman <nathan@clusterfs.com>
41 */
42
43
44 #define DEBUG_SUBSYSTEM S_CLASS
45 #define D_MOUNT (D_SUPER|D_CONFIG/*|D_WARNING */)
46 #define PRINT_CMD CDEBUG
47
48 #include "../include/obd.h"
49 #include "../include/linux/lustre_compat25.h"
50 #include "../include/obd_class.h"
51 #include "../include/lustre/lustre_user.h"
52 #include "../include/lustre_log.h"
53 #include "../include/lustre_disk.h"
54 #include "../include/lustre_param.h"
55
56 static int (*client_fill_super)(struct super_block *sb,
57 struct vfsmount *mnt);
58
59 static void (*kill_super_cb)(struct super_block *sb);
60
61 /**************** config llog ********************/
62
63 /** Get a config log from the MGS and process it.
64 * This func is called for both clients and servers.
65 * Continue to process new statements appended to the logs
66 * (whenever the config lock is revoked) until lustre_end_log
67 * is called.
68 * @param sb The superblock is used by the MGC to write to the local copy of
69 * the config log
70 * @param logname The name of the llog to replicate from the MGS
71 * @param cfg Since the same mgc may be used to follow multiple config logs
72 * (e.g. ost1, ost2, client), the config_llog_instance keeps the state for
73 * this log, and is added to the mgc's list of logs to follow.
74 */
lustre_process_log(struct super_block * sb,char * logname,struct config_llog_instance * cfg)75 int lustre_process_log(struct super_block *sb, char *logname,
76 struct config_llog_instance *cfg)
77 {
78 struct lustre_cfg *lcfg;
79 struct lustre_cfg_bufs *bufs;
80 struct lustre_sb_info *lsi = s2lsi(sb);
81 struct obd_device *mgc = lsi->lsi_mgc;
82 int rc;
83
84 LASSERT(mgc);
85 LASSERT(cfg);
86
87 OBD_ALLOC_PTR(bufs);
88 if (bufs == NULL)
89 return -ENOMEM;
90
91 /* mgc_process_config */
92 lustre_cfg_bufs_reset(bufs, mgc->obd_name);
93 lustre_cfg_bufs_set_string(bufs, 1, logname);
94 lustre_cfg_bufs_set(bufs, 2, cfg, sizeof(*cfg));
95 lustre_cfg_bufs_set(bufs, 3, &sb, sizeof(sb));
96 lcfg = lustre_cfg_new(LCFG_LOG_START, bufs);
97 rc = obd_process_config(mgc, sizeof(*lcfg), lcfg);
98 lustre_cfg_free(lcfg);
99
100 OBD_FREE_PTR(bufs);
101
102 if (rc == -EINVAL)
103 LCONSOLE_ERROR_MSG(0x15b, "%s: The configuration from log '%s' failed from the MGS (%d). Make sure this client and the MGS are running compatible versions of Lustre.\n",
104 mgc->obd_name, logname, rc);
105
106 if (rc)
107 LCONSOLE_ERROR_MSG(0x15c, "%s: The configuration from log '%s' failed (%d). This may be the result of communication errors between this node and the MGS, a bad configuration, or other errors. See the syslog for more information.\n",
108 mgc->obd_name, logname,
109 rc);
110
111 /* class_obd_list(); */
112 return rc;
113 }
114 EXPORT_SYMBOL(lustre_process_log);
115
116 /* Stop watching this config log for updates */
lustre_end_log(struct super_block * sb,char * logname,struct config_llog_instance * cfg)117 int lustre_end_log(struct super_block *sb, char *logname,
118 struct config_llog_instance *cfg)
119 {
120 struct lustre_cfg *lcfg;
121 struct lustre_cfg_bufs bufs;
122 struct lustre_sb_info *lsi = s2lsi(sb);
123 struct obd_device *mgc = lsi->lsi_mgc;
124 int rc;
125
126 if (!mgc)
127 return -ENOENT;
128
129 /* mgc_process_config */
130 lustre_cfg_bufs_reset(&bufs, mgc->obd_name);
131 lustre_cfg_bufs_set_string(&bufs, 1, logname);
132 if (cfg)
133 lustre_cfg_bufs_set(&bufs, 2, cfg, sizeof(*cfg));
134 lcfg = lustre_cfg_new(LCFG_LOG_END, &bufs);
135 rc = obd_process_config(mgc, sizeof(*lcfg), lcfg);
136 lustre_cfg_free(lcfg);
137 return rc;
138 }
139 EXPORT_SYMBOL(lustre_end_log);
140
141 /**************** obd start *******************/
142
143 /** lustre_cfg_bufs are a holdover from 1.4; we can still set these up from
144 * lctl (and do for echo cli/srv.
145 */
do_lcfg(char * cfgname,lnet_nid_t nid,int cmd,char * s1,char * s2,char * s3,char * s4)146 int do_lcfg(char *cfgname, lnet_nid_t nid, int cmd,
147 char *s1, char *s2, char *s3, char *s4)
148 {
149 struct lustre_cfg_bufs bufs;
150 struct lustre_cfg * lcfg = NULL;
151 int rc;
152
153 CDEBUG(D_TRACE, "lcfg %s %#x %s %s %s %s\n", cfgname,
154 cmd, s1, s2, s3, s4);
155
156 lustre_cfg_bufs_reset(&bufs, cfgname);
157 if (s1)
158 lustre_cfg_bufs_set_string(&bufs, 1, s1);
159 if (s2)
160 lustre_cfg_bufs_set_string(&bufs, 2, s2);
161 if (s3)
162 lustre_cfg_bufs_set_string(&bufs, 3, s3);
163 if (s4)
164 lustre_cfg_bufs_set_string(&bufs, 4, s4);
165
166 lcfg = lustre_cfg_new(cmd, &bufs);
167 lcfg->lcfg_nid = nid;
168 rc = class_process_config(lcfg);
169 lustre_cfg_free(lcfg);
170 return rc;
171 }
172 EXPORT_SYMBOL(do_lcfg);
173
174 /** Call class_attach and class_setup. These methods in turn call
175 * obd type-specific methods.
176 */
lustre_start_simple(char * obdname,char * type,char * uuid,char * s1,char * s2,char * s3,char * s4)177 int lustre_start_simple(char *obdname, char *type, char *uuid,
178 char *s1, char *s2, char *s3, char *s4)
179 {
180 int rc;
181 CDEBUG(D_MOUNT, "Starting obd %s (typ=%s)\n", obdname, type);
182
183 rc = do_lcfg(obdname, 0, LCFG_ATTACH, type, uuid, NULL, NULL);
184 if (rc) {
185 CERROR("%s attach error %d\n", obdname, rc);
186 return rc;
187 }
188 rc = do_lcfg(obdname, 0, LCFG_SETUP, s1, s2, s3, s4);
189 if (rc) {
190 CERROR("%s setup error %d\n", obdname, rc);
191 do_lcfg(obdname, 0, LCFG_DETACH, NULL, NULL, NULL, NULL);
192 }
193 return rc;
194 }
195
196 DEFINE_MUTEX(mgc_start_lock);
197
198 /** Set up a mgc obd to process startup logs
199 *
200 * \param sb [in] super block of the mgc obd
201 *
202 * \retval 0 success, otherwise error code
203 */
lustre_start_mgc(struct super_block * sb)204 int lustre_start_mgc(struct super_block *sb)
205 {
206 struct obd_connect_data *data = NULL;
207 struct lustre_sb_info *lsi = s2lsi(sb);
208 struct obd_device *obd;
209 struct obd_export *exp;
210 struct obd_uuid *uuid;
211 class_uuid_t uuidc;
212 lnet_nid_t nid;
213 char *mgcname = NULL, *niduuid = NULL, *mgssec = NULL;
214 char *ptr;
215 int rc = 0, i = 0, j, len;
216
217 LASSERT(lsi->lsi_lmd);
218
219 /* Find the first non-lo MGS nid for our MGC name */
220 if (IS_SERVER(lsi)) {
221 /* mount -o mgsnode=nid */
222 ptr = lsi->lsi_lmd->lmd_mgs;
223 if (lsi->lsi_lmd->lmd_mgs &&
224 (class_parse_nid(lsi->lsi_lmd->lmd_mgs, &nid, &ptr) == 0)) {
225 i++;
226 } else if (IS_MGS(lsi)) {
227 lnet_process_id_t id;
228 while ((rc = LNetGetId(i++, &id)) != -ENOENT) {
229 if (LNET_NETTYP(LNET_NIDNET(id.nid)) == LOLND)
230 continue;
231 nid = id.nid;
232 i++;
233 break;
234 }
235 }
236 } else { /* client */
237 /* Use nids from mount line: uml1,1@elan:uml2,2@elan:/lustre */
238 ptr = lsi->lsi_lmd->lmd_dev;
239 if (class_parse_nid(ptr, &nid, &ptr) == 0)
240 i++;
241 }
242 if (i == 0) {
243 CERROR("No valid MGS nids found.\n");
244 return -EINVAL;
245 }
246
247 mutex_lock(&mgc_start_lock);
248
249 len = strlen(LUSTRE_MGC_OBDNAME) + strlen(libcfs_nid2str(nid)) + 1;
250 OBD_ALLOC(mgcname, len);
251 OBD_ALLOC(niduuid, len + 2);
252 if (!mgcname || !niduuid) {
253 rc = -ENOMEM;
254 goto out_free;
255 }
256 sprintf(mgcname, "%s%s", LUSTRE_MGC_OBDNAME, libcfs_nid2str(nid));
257
258 mgssec = lsi->lsi_lmd->lmd_mgssec ? lsi->lsi_lmd->lmd_mgssec : "";
259
260 OBD_ALLOC_PTR(data);
261 if (data == NULL) {
262 rc = -ENOMEM;
263 goto out_free;
264 }
265
266 obd = class_name2obd(mgcname);
267 if (obd && !obd->obd_stopping) {
268 int recov_bk;
269
270 rc = obd_set_info_async(NULL, obd->obd_self_export,
271 strlen(KEY_MGSSEC), KEY_MGSSEC,
272 strlen(mgssec), mgssec, NULL);
273 if (rc)
274 goto out_free;
275
276 /* Re-using an existing MGC */
277 atomic_inc(&obd->u.cli.cl_mgc_refcount);
278
279 /* IR compatibility check, only for clients */
280 if (lmd_is_client(lsi->lsi_lmd)) {
281 int has_ir;
282 int vallen = sizeof(*data);
283 __u32 *flags = &lsi->lsi_lmd->lmd_flags;
284
285 rc = obd_get_info(NULL, obd->obd_self_export,
286 strlen(KEY_CONN_DATA), KEY_CONN_DATA,
287 &vallen, data, NULL);
288 LASSERT(rc == 0);
289 has_ir = OCD_HAS_FLAG(data, IMP_RECOV);
290 if (has_ir ^ !(*flags & LMD_FLG_NOIR)) {
291 /* LMD_FLG_NOIR is for test purpose only */
292 LCONSOLE_WARN(
293 "Trying to mount a client with IR setting not compatible with current mgc. Force to use current mgc setting that is IR %s.\n",
294 has_ir ? "enabled" : "disabled");
295 if (has_ir)
296 *flags &= ~LMD_FLG_NOIR;
297 else
298 *flags |= LMD_FLG_NOIR;
299 }
300 }
301
302 recov_bk = 0;
303 /* If we are restarting the MGS, don't try to keep the MGC's
304 old connection, or registration will fail. */
305 if (IS_MGS(lsi)) {
306 CDEBUG(D_MOUNT, "New MGS with live MGC\n");
307 recov_bk = 1;
308 }
309
310 /* Try all connections, but only once (again).
311 We don't want to block another target from starting
312 (using its local copy of the log), but we do want to connect
313 if at all possible. */
314 recov_bk++;
315 CDEBUG(D_MOUNT, "%s: Set MGC reconnect %d\n", mgcname,
316 recov_bk);
317 rc = obd_set_info_async(NULL, obd->obd_self_export,
318 sizeof(KEY_INIT_RECOV_BACKUP),
319 KEY_INIT_RECOV_BACKUP,
320 sizeof(recov_bk), &recov_bk, NULL);
321 rc = 0;
322 goto out;
323 }
324
325 CDEBUG(D_MOUNT, "Start MGC '%s'\n", mgcname);
326
327 /* Add the primary nids for the MGS */
328 i = 0;
329 sprintf(niduuid, "%s_%x", mgcname, i);
330 if (IS_SERVER(lsi)) {
331 ptr = lsi->lsi_lmd->lmd_mgs;
332 if (IS_MGS(lsi)) {
333 /* Use local nids (including LO) */
334 lnet_process_id_t id;
335 while ((rc = LNetGetId(i++, &id)) != -ENOENT) {
336 rc = do_lcfg(mgcname, id.nid,
337 LCFG_ADD_UUID, niduuid,
338 NULL, NULL, NULL);
339 }
340 } else {
341 /* Use mgsnode= nids */
342 /* mount -o mgsnode=nid */
343 if (lsi->lsi_lmd->lmd_mgs) {
344 ptr = lsi->lsi_lmd->lmd_mgs;
345 } else if (class_find_param(ptr, PARAM_MGSNODE,
346 &ptr) != 0) {
347 CERROR("No MGS nids given.\n");
348 rc = -EINVAL;
349 goto out_free;
350 }
351 while (class_parse_nid(ptr, &nid, &ptr) == 0) {
352 rc = do_lcfg(mgcname, nid,
353 LCFG_ADD_UUID, niduuid,
354 NULL, NULL, NULL);
355 i++;
356 }
357 }
358 } else { /* client */
359 /* Use nids from mount line: uml1,1@elan:uml2,2@elan:/lustre */
360 ptr = lsi->lsi_lmd->lmd_dev;
361 while (class_parse_nid(ptr, &nid, &ptr) == 0) {
362 rc = do_lcfg(mgcname, nid,
363 LCFG_ADD_UUID, niduuid, NULL, NULL, NULL);
364 i++;
365 /* Stop at the first failover nid */
366 if (*ptr == ':')
367 break;
368 }
369 }
370 if (i == 0) {
371 CERROR("No valid MGS nids found.\n");
372 rc = -EINVAL;
373 goto out_free;
374 }
375 lsi->lsi_lmd->lmd_mgs_failnodes = 1;
376
377 /* Random uuid for MGC allows easier reconnects */
378 OBD_ALLOC_PTR(uuid);
379 if (!uuid) {
380 rc = -ENOMEM;
381 goto out_free;
382 }
383
384 ll_generate_random_uuid(uuidc);
385 class_uuid_unparse(uuidc, uuid);
386
387 /* Start the MGC */
388 rc = lustre_start_simple(mgcname, LUSTRE_MGC_NAME,
389 (char *)uuid->uuid, LUSTRE_MGS_OBDNAME,
390 niduuid, NULL, NULL);
391 OBD_FREE_PTR(uuid);
392 if (rc)
393 goto out_free;
394
395 /* Add any failover MGS nids */
396 i = 1;
397 while (ptr && ((*ptr == ':' ||
398 class_find_param(ptr, PARAM_MGSNODE, &ptr) == 0))) {
399 /* New failover node */
400 sprintf(niduuid, "%s_%x", mgcname, i);
401 j = 0;
402 while (class_parse_nid_quiet(ptr, &nid, &ptr) == 0) {
403 j++;
404 rc = do_lcfg(mgcname, nid,
405 LCFG_ADD_UUID, niduuid, NULL, NULL, NULL);
406 if (*ptr == ':')
407 break;
408 }
409 if (j > 0) {
410 rc = do_lcfg(mgcname, 0, LCFG_ADD_CONN,
411 niduuid, NULL, NULL, NULL);
412 i++;
413 } else {
414 /* at ":/fsname" */
415 break;
416 }
417 }
418 lsi->lsi_lmd->lmd_mgs_failnodes = i;
419
420 obd = class_name2obd(mgcname);
421 if (!obd) {
422 CERROR("Can't find mgcobd %s\n", mgcname);
423 rc = -ENOTCONN;
424 goto out_free;
425 }
426
427 rc = obd_set_info_async(NULL, obd->obd_self_export,
428 strlen(KEY_MGSSEC), KEY_MGSSEC,
429 strlen(mgssec), mgssec, NULL);
430 if (rc)
431 goto out_free;
432
433 /* Keep a refcount of servers/clients who started with "mount",
434 so we know when we can get rid of the mgc. */
435 atomic_set(&obd->u.cli.cl_mgc_refcount, 1);
436
437 /* We connect to the MGS at setup, and don't disconnect until cleanup */
438 data->ocd_connect_flags = OBD_CONNECT_VERSION | OBD_CONNECT_AT |
439 OBD_CONNECT_FULL20 | OBD_CONNECT_IMP_RECOV |
440 OBD_CONNECT_LVB_TYPE;
441
442 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 2, 50, 0)
443 data->ocd_connect_flags |= OBD_CONNECT_MNE_SWAB;
444 #else
445 #warning "LU-1644: Remove old OBD_CONNECT_MNE_SWAB fixup and imp_need_mne_swab"
446 #endif
447
448 if (lmd_is_client(lsi->lsi_lmd) &&
449 lsi->lsi_lmd->lmd_flags & LMD_FLG_NOIR)
450 data->ocd_connect_flags &= ~OBD_CONNECT_IMP_RECOV;
451 data->ocd_version = LUSTRE_VERSION_CODE;
452 rc = obd_connect(NULL, &exp, obd, &(obd->obd_uuid), data, NULL);
453 if (rc) {
454 CERROR("connect failed %d\n", rc);
455 goto out;
456 }
457
458 obd->u.cli.cl_mgc_mgsexp = exp;
459
460 out:
461 /* Keep the mgc info in the sb. Note that many lsi's can point
462 to the same mgc.*/
463 lsi->lsi_mgc = obd;
464 out_free:
465 mutex_unlock(&mgc_start_lock);
466
467 if (data)
468 OBD_FREE_PTR(data);
469 if (mgcname)
470 OBD_FREE(mgcname, len);
471 if (niduuid)
472 OBD_FREE(niduuid, len + 2);
473 return rc;
474 }
475
lustre_stop_mgc(struct super_block * sb)476 static int lustre_stop_mgc(struct super_block *sb)
477 {
478 struct lustre_sb_info *lsi = s2lsi(sb);
479 struct obd_device *obd;
480 char *niduuid = NULL, *ptr = NULL;
481 int i, rc = 0, len = 0;
482
483 if (!lsi)
484 return -ENOENT;
485 obd = lsi->lsi_mgc;
486 if (!obd)
487 return -ENOENT;
488 lsi->lsi_mgc = NULL;
489
490 mutex_lock(&mgc_start_lock);
491 LASSERT(atomic_read(&obd->u.cli.cl_mgc_refcount) > 0);
492 if (!atomic_dec_and_test(&obd->u.cli.cl_mgc_refcount)) {
493 /* This is not fatal, every client that stops
494 will call in here. */
495 CDEBUG(D_MOUNT, "mgc still has %d references.\n",
496 atomic_read(&obd->u.cli.cl_mgc_refcount));
497 rc = -EBUSY;
498 goto out;
499 }
500
501 /* The MGC has no recoverable data in any case.
502 * force shutdown set in umount_begin */
503 obd->obd_no_recov = 1;
504
505 if (obd->u.cli.cl_mgc_mgsexp) {
506 /* An error is not fatal, if we are unable to send the
507 disconnect mgs ping evictor cleans up the export */
508 rc = obd_disconnect(obd->u.cli.cl_mgc_mgsexp);
509 if (rc)
510 CDEBUG(D_MOUNT, "disconnect failed %d\n", rc);
511 }
512
513 /* Save the obdname for cleaning the nid uuids, which are
514 obdname_XX */
515 len = strlen(obd->obd_name) + 6;
516 OBD_ALLOC(niduuid, len);
517 if (niduuid) {
518 strcpy(niduuid, obd->obd_name);
519 ptr = niduuid + strlen(niduuid);
520 }
521
522 rc = class_manual_cleanup(obd);
523 if (rc)
524 goto out;
525
526 /* Clean the nid uuids */
527 if (!niduuid) {
528 rc = -ENOMEM;
529 goto out;
530 }
531
532 for (i = 0; i < lsi->lsi_lmd->lmd_mgs_failnodes; i++) {
533 sprintf(ptr, "_%x", i);
534 rc = do_lcfg(LUSTRE_MGC_OBDNAME, 0, LCFG_DEL_UUID,
535 niduuid, NULL, NULL, NULL);
536 if (rc)
537 CERROR("del MDC UUID %s failed: rc = %d\n",
538 niduuid, rc);
539 }
540 out:
541 if (niduuid)
542 OBD_FREE(niduuid, len);
543
544 /* class_import_put will get rid of the additional connections */
545 mutex_unlock(&mgc_start_lock);
546 return rc;
547 }
548
549 /***************** lustre superblock **************/
550
lustre_init_lsi(struct super_block * sb)551 struct lustre_sb_info *lustre_init_lsi(struct super_block *sb)
552 {
553 struct lustre_sb_info *lsi;
554
555 OBD_ALLOC_PTR(lsi);
556 if (!lsi)
557 return NULL;
558 OBD_ALLOC_PTR(lsi->lsi_lmd);
559 if (!lsi->lsi_lmd) {
560 OBD_FREE_PTR(lsi);
561 return NULL;
562 }
563
564 lsi->lsi_lmd->lmd_exclude_count = 0;
565 lsi->lsi_lmd->lmd_recovery_time_soft = 0;
566 lsi->lsi_lmd->lmd_recovery_time_hard = 0;
567 s2lsi_nocast(sb) = lsi;
568 /* we take 1 extra ref for our setup */
569 atomic_set(&lsi->lsi_mounts, 1);
570
571 /* Default umount style */
572 lsi->lsi_flags = LSI_UMOUNT_FAILOVER;
573
574 return lsi;
575 }
576
lustre_free_lsi(struct super_block * sb)577 static int lustre_free_lsi(struct super_block *sb)
578 {
579 struct lustre_sb_info *lsi = s2lsi(sb);
580
581 LASSERT(lsi != NULL);
582 CDEBUG(D_MOUNT, "Freeing lsi %p\n", lsi);
583
584 /* someone didn't call server_put_mount. */
585 LASSERT(atomic_read(&lsi->lsi_mounts) == 0);
586
587 if (lsi->lsi_lmd != NULL) {
588 if (lsi->lsi_lmd->lmd_dev != NULL)
589 OBD_FREE(lsi->lsi_lmd->lmd_dev,
590 strlen(lsi->lsi_lmd->lmd_dev) + 1);
591 if (lsi->lsi_lmd->lmd_profile != NULL)
592 OBD_FREE(lsi->lsi_lmd->lmd_profile,
593 strlen(lsi->lsi_lmd->lmd_profile) + 1);
594 if (lsi->lsi_lmd->lmd_mgssec != NULL)
595 OBD_FREE(lsi->lsi_lmd->lmd_mgssec,
596 strlen(lsi->lsi_lmd->lmd_mgssec) + 1);
597 if (lsi->lsi_lmd->lmd_opts != NULL)
598 OBD_FREE(lsi->lsi_lmd->lmd_opts,
599 strlen(lsi->lsi_lmd->lmd_opts) + 1);
600 if (lsi->lsi_lmd->lmd_exclude_count)
601 OBD_FREE(lsi->lsi_lmd->lmd_exclude,
602 sizeof(lsi->lsi_lmd->lmd_exclude[0]) *
603 lsi->lsi_lmd->lmd_exclude_count);
604 if (lsi->lsi_lmd->lmd_mgs != NULL)
605 OBD_FREE(lsi->lsi_lmd->lmd_mgs,
606 strlen(lsi->lsi_lmd->lmd_mgs) + 1);
607 if (lsi->lsi_lmd->lmd_osd_type != NULL)
608 OBD_FREE(lsi->lsi_lmd->lmd_osd_type,
609 strlen(lsi->lsi_lmd->lmd_osd_type) + 1);
610 if (lsi->lsi_lmd->lmd_params != NULL)
611 OBD_FREE(lsi->lsi_lmd->lmd_params, 4096);
612
613 OBD_FREE(lsi->lsi_lmd, sizeof(*lsi->lsi_lmd));
614 }
615
616 LASSERT(lsi->lsi_llsbi == NULL);
617 OBD_FREE(lsi, sizeof(*lsi));
618 s2lsi_nocast(sb) = NULL;
619
620 return 0;
621 }
622
623 /* The lsi has one reference for every server that is using the disk -
624 e.g. MDT, MGS, and potentially MGC */
lustre_put_lsi(struct super_block * sb)625 int lustre_put_lsi(struct super_block *sb)
626 {
627 struct lustre_sb_info *lsi = s2lsi(sb);
628
629 LASSERT(lsi != NULL);
630
631 CDEBUG(D_MOUNT, "put %p %d\n", sb, atomic_read(&lsi->lsi_mounts));
632 if (atomic_dec_and_test(&lsi->lsi_mounts)) {
633 if (IS_SERVER(lsi) && lsi->lsi_osd_exp) {
634 lu_device_put(&lsi->lsi_dt_dev->dd_lu_dev);
635 lsi->lsi_osd_exp->exp_obd->obd_lvfs_ctxt.dt = NULL;
636 lsi->lsi_dt_dev = NULL;
637 obd_disconnect(lsi->lsi_osd_exp);
638 /* wait till OSD is gone */
639 obd_zombie_barrier();
640 }
641 lustre_free_lsi(sb);
642 return 1;
643 }
644 return 0;
645 }
646
647 /*** SERVER NAME ***
648 * <FSNAME><SEPARATOR><TYPE><INDEX>
649 * FSNAME is between 1 and 8 characters (inclusive).
650 * Excluded characters are '/' and ':'
651 * SEPARATOR is either ':' or '-'
652 * TYPE: "OST", "MDT", etc.
653 * INDEX: Hex representation of the index
654 */
655
656 /** Get the fsname ("lustre") from the server name ("lustre-OST003F").
657 * @param [in] svname server name including type and index
658 * @param [out] fsname Buffer to copy filesystem name prefix into.
659 * Must have at least 'strlen(fsname) + 1' chars.
660 * @param [out] endptr if endptr isn't NULL it is set to end of fsname
661 * rc < 0 on error
662 */
server_name2fsname(const char * svname,char * fsname,const char ** endptr)663 int server_name2fsname(const char *svname, char *fsname, const char **endptr)
664 {
665 const char *dash;
666
667 dash = svname + strnlen(svname, 8); /* max fsname length is 8 */
668 for (; dash > svname && *dash != '-' && *dash != ':'; dash--)
669 ;
670 if (dash == svname)
671 return -EINVAL;
672
673 if (fsname != NULL) {
674 strncpy(fsname, svname, dash - svname);
675 fsname[dash - svname] = '\0';
676 }
677
678 if (endptr != NULL)
679 *endptr = dash;
680
681 return 0;
682 }
683 EXPORT_SYMBOL(server_name2fsname);
684
685 /**
686 * Get service name (svname) from string
687 * rc < 0 on error
688 * if endptr isn't NULL it is set to end of fsname *
689 */
server_name2svname(const char * label,char * svname,const char ** endptr,size_t svsize)690 int server_name2svname(const char *label, char *svname, const char **endptr,
691 size_t svsize)
692 {
693 int rc;
694 const char *dash;
695
696 /* We use server_name2fsname() just for parsing */
697 rc = server_name2fsname(label, NULL, &dash);
698 if (rc != 0)
699 return rc;
700
701 if (endptr != NULL)
702 *endptr = dash;
703
704 if (strlcpy(svname, dash + 1, svsize) >= svsize)
705 return -E2BIG;
706
707 return 0;
708 }
709 EXPORT_SYMBOL(server_name2svname);
710
711
712 /* Get the index from the obd name.
713 rc = server type, or
714 rc < 0 on error
715 if endptr isn't NULL it is set to end of name */
server_name2index(const char * svname,__u32 * idx,const char ** endptr)716 int server_name2index(const char *svname, __u32 *idx, const char **endptr)
717 {
718 unsigned long index;
719 int rc;
720 const char *dash;
721
722 /* We use server_name2fsname() just for parsing */
723 rc = server_name2fsname(svname, NULL, &dash);
724 if (rc != 0)
725 return rc;
726
727 dash++;
728
729 if (strncmp(dash, "MDT", 3) == 0)
730 rc = LDD_F_SV_TYPE_MDT;
731 else if (strncmp(dash, "OST", 3) == 0)
732 rc = LDD_F_SV_TYPE_OST;
733 else
734 return -EINVAL;
735
736 dash += 3;
737
738 if (strncmp(dash, "all", 3) == 0) {
739 if (endptr != NULL)
740 *endptr = dash + 3;
741 return rc | LDD_F_SV_ALL;
742 }
743
744 index = simple_strtoul(dash, (char **)endptr, 16);
745 if (idx != NULL)
746 *idx = index;
747
748 /* Account for -mdc after index that is possible when specifying mdt */
749 if (endptr != NULL && strncmp(LUSTRE_MDC_NAME, *endptr + 1,
750 sizeof(LUSTRE_MDC_NAME)-1) == 0)
751 *endptr += sizeof(LUSTRE_MDC_NAME);
752
753 return rc;
754 }
755 EXPORT_SYMBOL(server_name2index);
756
757 /*************** mount common between server and client ***************/
758
759 /* Common umount */
lustre_common_put_super(struct super_block * sb)760 int lustre_common_put_super(struct super_block *sb)
761 {
762 int rc;
763
764 CDEBUG(D_MOUNT, "dropping sb %p\n", sb);
765
766 /* Drop a ref to the MGC */
767 rc = lustre_stop_mgc(sb);
768 if (rc && (rc != -ENOENT)) {
769 if (rc != -EBUSY) {
770 CERROR("Can't stop MGC: %d\n", rc);
771 return rc;
772 }
773 /* BUSY just means that there's some other obd that
774 needs the mgc. Let him clean it up. */
775 CDEBUG(D_MOUNT, "MGC still in use\n");
776 }
777 /* Drop a ref to the mounted disk */
778 lustre_put_lsi(sb);
779 lu_types_stop();
780 return rc;
781 }
782 EXPORT_SYMBOL(lustre_common_put_super);
783
lmd_print(struct lustre_mount_data * lmd)784 static void lmd_print(struct lustre_mount_data *lmd)
785 {
786 int i;
787
788 PRINT_CMD(D_MOUNT, " mount data:\n");
789 if (lmd_is_client(lmd))
790 PRINT_CMD(D_MOUNT, "profile: %s\n", lmd->lmd_profile);
791 PRINT_CMD(D_MOUNT, "device: %s\n", lmd->lmd_dev);
792 PRINT_CMD(D_MOUNT, "flags: %x\n", lmd->lmd_flags);
793
794 if (lmd->lmd_opts)
795 PRINT_CMD(D_MOUNT, "options: %s\n", lmd->lmd_opts);
796
797 if (lmd->lmd_recovery_time_soft)
798 PRINT_CMD(D_MOUNT, "recovery time soft: %d\n",
799 lmd->lmd_recovery_time_soft);
800
801 if (lmd->lmd_recovery_time_hard)
802 PRINT_CMD(D_MOUNT, "recovery time hard: %d\n",
803 lmd->lmd_recovery_time_hard);
804
805 for (i = 0; i < lmd->lmd_exclude_count; i++) {
806 PRINT_CMD(D_MOUNT, "exclude %d: OST%04x\n", i,
807 lmd->lmd_exclude[i]);
808 }
809 }
810
811 /* Is this server on the exclusion list */
lustre_check_exclusion(struct super_block * sb,char * svname)812 int lustre_check_exclusion(struct super_block *sb, char *svname)
813 {
814 struct lustre_sb_info *lsi = s2lsi(sb);
815 struct lustre_mount_data *lmd = lsi->lsi_lmd;
816 __u32 index;
817 int i, rc;
818
819 rc = server_name2index(svname, &index, NULL);
820 if (rc != LDD_F_SV_TYPE_OST)
821 /* Only exclude OSTs */
822 return 0;
823
824 CDEBUG(D_MOUNT, "Check exclusion %s (%d) in %d of %s\n", svname,
825 index, lmd->lmd_exclude_count, lmd->lmd_dev);
826
827 for (i = 0; i < lmd->lmd_exclude_count; i++) {
828 if (index == lmd->lmd_exclude[i]) {
829 CWARN("Excluding %s (on exclusion list)\n", svname);
830 return 1;
831 }
832 }
833 return 0;
834 }
835
836 /* mount -v -o exclude=lustre-OST0001:lustre-OST0002 -t lustre ... */
lmd_make_exclusion(struct lustre_mount_data * lmd,const char * ptr)837 static int lmd_make_exclusion(struct lustre_mount_data *lmd, const char *ptr)
838 {
839 const char *s1 = ptr, *s2;
840 __u32 index, *exclude_list;
841 int rc = 0, devmax;
842
843 /* The shortest an ost name can be is 8 chars: -OST0000.
844 We don't actually know the fsname at this time, so in fact
845 a user could specify any fsname. */
846 devmax = strlen(ptr) / 8 + 1;
847
848 /* temp storage until we figure out how many we have */
849 OBD_ALLOC(exclude_list, sizeof(index) * devmax);
850 if (!exclude_list)
851 return -ENOMEM;
852
853 /* we enter this fn pointing at the '=' */
854 while (*s1 && *s1 != ' ' && *s1 != ',') {
855 s1++;
856 rc = server_name2index(s1, &index, &s2);
857 if (rc < 0) {
858 CERROR("Can't parse server name '%s': rc = %d\n",
859 s1, rc);
860 break;
861 }
862 if (rc == LDD_F_SV_TYPE_OST)
863 exclude_list[lmd->lmd_exclude_count++] = index;
864 else
865 CDEBUG(D_MOUNT, "ignoring exclude %.*s: type = %#x\n",
866 (uint)(s2-s1), s1, rc);
867 s1 = s2;
868 /* now we are pointing at ':' (next exclude)
869 or ',' (end of excludes) */
870 if (lmd->lmd_exclude_count >= devmax)
871 break;
872 }
873 if (rc >= 0) /* non-err */
874 rc = 0;
875
876 if (lmd->lmd_exclude_count) {
877 /* permanent, freed in lustre_free_lsi */
878 OBD_ALLOC(lmd->lmd_exclude, sizeof(index) *
879 lmd->lmd_exclude_count);
880 if (lmd->lmd_exclude) {
881 memcpy(lmd->lmd_exclude, exclude_list,
882 sizeof(index) * lmd->lmd_exclude_count);
883 } else {
884 rc = -ENOMEM;
885 lmd->lmd_exclude_count = 0;
886 }
887 }
888 OBD_FREE(exclude_list, sizeof(index) * devmax);
889 return rc;
890 }
891
lmd_parse_mgssec(struct lustre_mount_data * lmd,char * ptr)892 static int lmd_parse_mgssec(struct lustre_mount_data *lmd, char *ptr)
893 {
894 char *tail;
895 int length;
896
897 if (lmd->lmd_mgssec != NULL) {
898 OBD_FREE(lmd->lmd_mgssec, strlen(lmd->lmd_mgssec) + 1);
899 lmd->lmd_mgssec = NULL;
900 }
901
902 tail = strchr(ptr, ',');
903 if (tail == NULL)
904 length = strlen(ptr);
905 else
906 length = tail - ptr;
907
908 OBD_ALLOC(lmd->lmd_mgssec, length + 1);
909 if (lmd->lmd_mgssec == NULL)
910 return -ENOMEM;
911
912 memcpy(lmd->lmd_mgssec, ptr, length);
913 lmd->lmd_mgssec[length] = '\0';
914 return 0;
915 }
916
lmd_parse_string(char ** handle,char * ptr)917 static int lmd_parse_string(char **handle, char *ptr)
918 {
919 char *tail;
920 int length;
921
922 if ((handle == NULL) || (ptr == NULL))
923 return -EINVAL;
924
925 if (*handle != NULL) {
926 OBD_FREE(*handle, strlen(*handle) + 1);
927 *handle = NULL;
928 }
929
930 tail = strchr(ptr, ',');
931 if (tail == NULL)
932 length = strlen(ptr);
933 else
934 length = tail - ptr;
935
936 OBD_ALLOC(*handle, length + 1);
937 if (*handle == NULL)
938 return -ENOMEM;
939
940 memcpy(*handle, ptr, length);
941 (*handle)[length] = '\0';
942
943 return 0;
944 }
945
946 /* Collect multiple values for mgsnid specifiers */
lmd_parse_mgs(struct lustre_mount_data * lmd,char ** ptr)947 static int lmd_parse_mgs(struct lustre_mount_data *lmd, char **ptr)
948 {
949 lnet_nid_t nid;
950 char *tail = *ptr;
951 char *mgsnid;
952 int length;
953 int oldlen = 0;
954
955 /* Find end of nidlist */
956 while (class_parse_nid_quiet(tail, &nid, &tail) == 0) {}
957 length = tail - *ptr;
958 if (length == 0) {
959 LCONSOLE_ERROR_MSG(0x159, "Can't parse NID '%s'\n", *ptr);
960 return -EINVAL;
961 }
962
963 if (lmd->lmd_mgs != NULL)
964 oldlen = strlen(lmd->lmd_mgs) + 1;
965
966 OBD_ALLOC(mgsnid, oldlen + length + 1);
967 if (mgsnid == NULL)
968 return -ENOMEM;
969
970 if (lmd->lmd_mgs != NULL) {
971 /* Multiple mgsnid= are taken to mean failover locations */
972 memcpy(mgsnid, lmd->lmd_mgs, oldlen);
973 mgsnid[oldlen - 1] = ':';
974 OBD_FREE(lmd->lmd_mgs, oldlen);
975 }
976 memcpy(mgsnid + oldlen, *ptr, length);
977 mgsnid[oldlen + length] = '\0';
978 lmd->lmd_mgs = mgsnid;
979 *ptr = tail;
980
981 return 0;
982 }
983
984 /** Parse mount line options
985 * e.g. mount -v -t lustre -o abort_recov uml1:uml2:/lustre-client /mnt/lustre
986 * dev is passed as device=uml1:/lustre by mount.lustre
987 */
lmd_parse(char * options,struct lustre_mount_data * lmd)988 static int lmd_parse(char *options, struct lustre_mount_data *lmd)
989 {
990 char *s1, *s2, *devname = NULL;
991 struct lustre_mount_data *raw = (struct lustre_mount_data *)options;
992 int rc = 0;
993
994 LASSERT(lmd);
995 if (!options) {
996 LCONSOLE_ERROR_MSG(0x162, "Missing mount data: check that /sbin/mount.lustre is installed.\n");
997 return -EINVAL;
998 }
999
1000 /* Options should be a string - try to detect old lmd data */
1001 if ((raw->lmd_magic & 0xffffff00) == (LMD_MAGIC & 0xffffff00)) {
1002 LCONSOLE_ERROR_MSG(0x163, "You're using an old version of /sbin/mount.lustre. Please install version %s\n",
1003 LUSTRE_VERSION_STRING);
1004 return -EINVAL;
1005 }
1006 lmd->lmd_magic = LMD_MAGIC;
1007
1008 OBD_ALLOC(lmd->lmd_params, 4096);
1009 if (lmd->lmd_params == NULL)
1010 return -ENOMEM;
1011 lmd->lmd_params[0] = '\0';
1012
1013 /* Set default flags here */
1014
1015 s1 = options;
1016 while (*s1) {
1017 int clear = 0;
1018 int time_min = OBD_RECOVERY_TIME_MIN;
1019
1020 /* Skip whitespace and extra commas */
1021 while (*s1 == ' ' || *s1 == ',')
1022 s1++;
1023
1024 /* Client options are parsed in ll_options: eg. flock,
1025 user_xattr, acl */
1026
1027 /* Parse non-ldiskfs options here. Rather than modifying
1028 ldiskfs, we just zero these out here */
1029 if (strncmp(s1, "abort_recov", 11) == 0) {
1030 lmd->lmd_flags |= LMD_FLG_ABORT_RECOV;
1031 clear++;
1032 } else if (strncmp(s1, "recovery_time_soft=", 19) == 0) {
1033 lmd->lmd_recovery_time_soft = max_t(int,
1034 simple_strtoul(s1 + 19, NULL, 10), time_min);
1035 clear++;
1036 } else if (strncmp(s1, "recovery_time_hard=", 19) == 0) {
1037 lmd->lmd_recovery_time_hard = max_t(int,
1038 simple_strtoul(s1 + 19, NULL, 10), time_min);
1039 clear++;
1040 } else if (strncmp(s1, "noir", 4) == 0) {
1041 lmd->lmd_flags |= LMD_FLG_NOIR; /* test purpose only. */
1042 clear++;
1043 } else if (strncmp(s1, "nosvc", 5) == 0) {
1044 lmd->lmd_flags |= LMD_FLG_NOSVC;
1045 clear++;
1046 } else if (strncmp(s1, "nomgs", 5) == 0) {
1047 lmd->lmd_flags |= LMD_FLG_NOMGS;
1048 clear++;
1049 } else if (strncmp(s1, "noscrub", 7) == 0) {
1050 lmd->lmd_flags |= LMD_FLG_NOSCRUB;
1051 clear++;
1052 } else if (strncmp(s1, PARAM_MGSNODE,
1053 sizeof(PARAM_MGSNODE) - 1) == 0) {
1054 s2 = s1 + sizeof(PARAM_MGSNODE) - 1;
1055 /* Assume the next mount opt is the first
1056 invalid nid we get to. */
1057 rc = lmd_parse_mgs(lmd, &s2);
1058 if (rc)
1059 goto invalid;
1060 clear++;
1061 } else if (strncmp(s1, "writeconf", 9) == 0) {
1062 lmd->lmd_flags |= LMD_FLG_WRITECONF;
1063 clear++;
1064 } else if (strncmp(s1, "update", 6) == 0) {
1065 lmd->lmd_flags |= LMD_FLG_UPDATE;
1066 clear++;
1067 } else if (strncmp(s1, "virgin", 6) == 0) {
1068 lmd->lmd_flags |= LMD_FLG_VIRGIN;
1069 clear++;
1070 } else if (strncmp(s1, "noprimnode", 10) == 0) {
1071 lmd->lmd_flags |= LMD_FLG_NO_PRIMNODE;
1072 clear++;
1073 } else if (strncmp(s1, "mgssec=", 7) == 0) {
1074 rc = lmd_parse_mgssec(lmd, s1 + 7);
1075 if (rc)
1076 goto invalid;
1077 clear++;
1078 /* ost exclusion list */
1079 } else if (strncmp(s1, "exclude=", 8) == 0) {
1080 rc = lmd_make_exclusion(lmd, s1 + 7);
1081 if (rc)
1082 goto invalid;
1083 clear++;
1084 } else if (strncmp(s1, "mgs", 3) == 0) {
1085 /* We are an MGS */
1086 lmd->lmd_flags |= LMD_FLG_MGS;
1087 clear++;
1088 } else if (strncmp(s1, "svname=", 7) == 0) {
1089 rc = lmd_parse_string(&lmd->lmd_profile, s1 + 7);
1090 if (rc)
1091 goto invalid;
1092 clear++;
1093 } else if (strncmp(s1, "param=", 6) == 0) {
1094 int length;
1095 char *tail = strchr(s1 + 6, ',');
1096 if (tail == NULL)
1097 length = strlen(s1);
1098 else
1099 length = tail - s1;
1100 length -= 6;
1101 strncat(lmd->lmd_params, s1 + 6, length);
1102 strcat(lmd->lmd_params, " ");
1103 clear++;
1104 } else if (strncmp(s1, "osd=", 4) == 0) {
1105 rc = lmd_parse_string(&lmd->lmd_osd_type, s1 + 4);
1106 if (rc)
1107 goto invalid;
1108 clear++;
1109 }
1110 /* Linux 2.4 doesn't pass the device, so we stuck it at the
1111 end of the options. */
1112 else if (strncmp(s1, "device=", 7) == 0) {
1113 devname = s1 + 7;
1114 /* terminate options right before device. device
1115 must be the last one. */
1116 *s1 = '\0';
1117 break;
1118 }
1119
1120 /* Find next opt */
1121 s2 = strchr(s1, ',');
1122 if (s2 == NULL) {
1123 if (clear)
1124 *s1 = '\0';
1125 break;
1126 }
1127 s2++;
1128 if (clear)
1129 memmove(s1, s2, strlen(s2) + 1);
1130 else
1131 s1 = s2;
1132 }
1133
1134 if (!devname) {
1135 LCONSOLE_ERROR_MSG(0x164, "Can't find the device name (need mount option 'device=...')\n");
1136 goto invalid;
1137 }
1138
1139 s1 = strstr(devname, ":/");
1140 if (s1) {
1141 ++s1;
1142 lmd->lmd_flags |= LMD_FLG_CLIENT;
1143 /* Remove leading /s from fsname */
1144 while (*++s1 == '/') ;
1145 /* Freed in lustre_free_lsi */
1146 OBD_ALLOC(lmd->lmd_profile, strlen(s1) + 8);
1147 if (!lmd->lmd_profile)
1148 return -ENOMEM;
1149 sprintf(lmd->lmd_profile, "%s-client", s1);
1150 }
1151
1152 /* Freed in lustre_free_lsi */
1153 OBD_ALLOC(lmd->lmd_dev, strlen(devname) + 1);
1154 if (!lmd->lmd_dev)
1155 return -ENOMEM;
1156 strcpy(lmd->lmd_dev, devname);
1157
1158 /* Save mount options */
1159 s1 = options + strlen(options) - 1;
1160 while (s1 >= options && (*s1 == ',' || *s1 == ' '))
1161 *s1-- = 0;
1162 if (*options != 0) {
1163 /* Freed in lustre_free_lsi */
1164 OBD_ALLOC(lmd->lmd_opts, strlen(options) + 1);
1165 if (!lmd->lmd_opts)
1166 return -ENOMEM;
1167 strcpy(lmd->lmd_opts, options);
1168 }
1169
1170 lmd_print(lmd);
1171 lmd->lmd_magic = LMD_MAGIC;
1172
1173 return rc;
1174
1175 invalid:
1176 CERROR("Bad mount options %s\n", options);
1177 return -EINVAL;
1178 }
1179
1180 struct lustre_mount_data2 {
1181 void *lmd2_data;
1182 struct vfsmount *lmd2_mnt;
1183 };
1184
1185 /** This is the entry point for the mount call into Lustre.
1186 * This is called when a server or client is mounted,
1187 * and this is where we start setting things up.
1188 * @param data Mount options (e.g. -o flock,abort_recov)
1189 */
lustre_fill_super(struct super_block * sb,void * data,int silent)1190 int lustre_fill_super(struct super_block *sb, void *data, int silent)
1191 {
1192 struct lustre_mount_data *lmd;
1193 struct lustre_mount_data2 *lmd2 = data;
1194 struct lustre_sb_info *lsi;
1195 int rc;
1196
1197 CDEBUG(D_MOUNT|D_VFSTRACE, "VFS Op: sb %p\n", sb);
1198
1199 lsi = lustre_init_lsi(sb);
1200 if (!lsi)
1201 return -ENOMEM;
1202 lmd = lsi->lsi_lmd;
1203
1204 /*
1205 * Disable lockdep during mount, because mount locking patterns are
1206 * `special'.
1207 */
1208 lockdep_off();
1209
1210 /*
1211 * LU-639: the obd cleanup of last mount may not finish yet, wait here.
1212 */
1213 obd_zombie_barrier();
1214
1215 /* Figure out the lmd from the mount options */
1216 if (lmd_parse((char *)(lmd2->lmd2_data), lmd)) {
1217 lustre_put_lsi(sb);
1218 rc = -EINVAL;
1219 goto out;
1220 }
1221
1222 if (lmd_is_client(lmd)) {
1223 CDEBUG(D_MOUNT, "Mounting client %s\n", lmd->lmd_profile);
1224 if (client_fill_super == NULL)
1225 request_module("lustre");
1226 if (client_fill_super == NULL) {
1227 LCONSOLE_ERROR_MSG(0x165, "Nothing registered for client mount! Is the 'lustre' module loaded?\n");
1228 lustre_put_lsi(sb);
1229 rc = -ENODEV;
1230 } else {
1231 rc = lustre_start_mgc(sb);
1232 if (rc) {
1233 lustre_put_lsi(sb);
1234 goto out;
1235 }
1236 /* Connect and start */
1237 /* (should always be ll_fill_super) */
1238 rc = (*client_fill_super)(sb, lmd2->lmd2_mnt);
1239 /* c_f_s will call lustre_common_put_super on failure */
1240 }
1241 } else {
1242 CERROR("This is client-side-only module, cannot handle server mount.\n");
1243 rc = -EINVAL;
1244 }
1245
1246 /* If error happens in fill_super() call, @lsi will be killed there.
1247 * This is why we do not put it here. */
1248 goto out;
1249 out:
1250 if (rc) {
1251 CERROR("Unable to mount %s (%d)\n",
1252 s2lsi(sb) ? lmd->lmd_dev : "", rc);
1253 } else {
1254 CDEBUG(D_SUPER, "Mount %s complete\n",
1255 lmd->lmd_dev);
1256 }
1257 lockdep_on();
1258 return rc;
1259 }
1260
1261
1262 /* We can't call ll_fill_super by name because it lives in a module that
1263 must be loaded after this one. */
lustre_register_client_fill_super(int (* cfs)(struct super_block * sb,struct vfsmount * mnt))1264 void lustre_register_client_fill_super(int (*cfs)(struct super_block *sb,
1265 struct vfsmount *mnt))
1266 {
1267 client_fill_super = cfs;
1268 }
1269 EXPORT_SYMBOL(lustre_register_client_fill_super);
1270
lustre_register_kill_super_cb(void (* cfs)(struct super_block * sb))1271 void lustre_register_kill_super_cb(void (*cfs)(struct super_block *sb))
1272 {
1273 kill_super_cb = cfs;
1274 }
1275 EXPORT_SYMBOL(lustre_register_kill_super_cb);
1276
1277 /***************** FS registration ******************/
lustre_mount(struct file_system_type * fs_type,int flags,const char * devname,void * data)1278 struct dentry *lustre_mount(struct file_system_type *fs_type, int flags,
1279 const char *devname, void *data)
1280 {
1281 struct lustre_mount_data2 lmd2 = {
1282 .lmd2_data = data,
1283 .lmd2_mnt = NULL
1284 };
1285
1286 return mount_nodev(fs_type, flags, &lmd2, lustre_fill_super);
1287 }
1288
lustre_kill_super(struct super_block * sb)1289 static void lustre_kill_super(struct super_block *sb)
1290 {
1291 struct lustre_sb_info *lsi = s2lsi(sb);
1292
1293 if (kill_super_cb && lsi && !IS_SERVER(lsi))
1294 (*kill_super_cb)(sb);
1295
1296 kill_anon_super(sb);
1297 }
1298
1299 /** Register the "lustre" fs type
1300 */
1301 struct file_system_type lustre_fs_type = {
1302 .owner = THIS_MODULE,
1303 .name = "lustre",
1304 .mount = lustre_mount,
1305 .kill_sb = lustre_kill_super,
1306 .fs_flags = FS_BINARY_MOUNTDATA | FS_REQUIRES_DEV |
1307 FS_HAS_FIEMAP | FS_RENAME_DOES_D_MOVE,
1308 };
1309 MODULE_ALIAS_FS("lustre");
1310
lustre_register_fs(void)1311 int lustre_register_fs(void)
1312 {
1313 return register_filesystem(&lustre_fs_type);
1314 }
1315
lustre_unregister_fs(void)1316 int lustre_unregister_fs(void)
1317 {
1318 return unregister_filesystem(&lustre_fs_type);
1319 }
1320