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[fs/lustre-release.git] / lustre / obdclass / obd_config.c
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.gnu.org/licenses/gpl-2.0.html
19  *
20  * GPL HEADER END
21  */
22 /*
23  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
24  * Use is subject to license terms.
25  *
26  * Copyright (c) 2011, 2017, Intel Corporation.
27  */
28 /*
29  * This file is part of Lustre, http://www.lustre.org/
30  * Lustre is a trademark of Sun Microsystems, Inc.
31  *
32  * lustre/obdclass/obd_config.c
33  *
34  * Config API
35  */
36
37 #define DEBUG_SUBSYSTEM S_CLASS
38
39 #include <linux/kobject.h>
40 #include <linux/string.h>
41
42 #include <llog_swab.h>
43 #include <lprocfs_status.h>
44 #include <lustre_disk.h>
45 #include <uapi/linux/lustre/lustre_ioctl.h>
46 #include <lustre_log.h>
47 #include <uapi/linux/lustre/lustre_param.h>
48 #include <obd_class.h>
49
50 #include "llog_internal.h"
51
52 static struct cfs_hash_ops uuid_hash_ops;
53 static struct cfs_hash_ops nid_hash_ops;
54 static struct cfs_hash_ops nid_stat_hash_ops;
55 static struct cfs_hash_ops gen_hash_ops;
56
57 /*********** string parsing utils *********/
58
59 /* returns 0 if we find this key in the buffer, else 1 */
60 int class_find_param(char *buf, char *key, char **valp)
61 {
62         char *ptr;
63
64         if (!buf)
65                 return 1;
66
67         if ((ptr = strstr(buf, key)) == NULL)
68                 return 1;
69
70         if (valp)
71                 *valp = ptr + strlen(key);
72
73         return 0;
74 }
75 EXPORT_SYMBOL(class_find_param);
76
77 /**
78  * Check whether the proc parameter \a param is an old parameter or not from
79  * the array \a ptr which contains the mapping from old parameters to new ones.
80  * If it's an old one, then return the pointer to the cfg_interop_param struc-
81  * ture which contains both the old and new parameters.
82  *
83  * \param param                 proc parameter
84  * \param ptr                   an array which contains the mapping from
85  *                              old parameters to new ones
86  *
87  * \retval valid-pointer        pointer to the cfg_interop_param structure
88  *                              which contains the old and new parameters
89  * \retval NULL                 \a param or \a ptr is NULL,
90  *                              or \a param is not an old parameter
91  */
92 struct cfg_interop_param *class_find_old_param(const char *param,
93                                                struct cfg_interop_param *ptr)
94 {
95         char *value = NULL;
96         int   name_len = 0;
97
98         if (param == NULL || ptr == NULL)
99                 RETURN(NULL);
100
101         value = strchr(param, '=');
102         if (value == NULL)
103                 name_len = strlen(param);
104         else
105                 name_len = value - param;
106
107         while (ptr->old_param != NULL) {
108                 if (strncmp(param, ptr->old_param, name_len) == 0 &&
109                     name_len == strlen(ptr->old_param))
110                         RETURN(ptr);
111                 ptr++;
112         }
113
114         RETURN(NULL);
115 }
116 EXPORT_SYMBOL(class_find_old_param);
117
118 /**
119  * Finds a parameter in \a params and copies it to \a copy.
120  *
121  * Leading spaces are skipped. Next space or end of string is the
122  * parameter terminator with the exception that spaces inside single or double
123  * quotes get included into a parameter. The parameter is copied into \a copy
124  * which has to be allocated big enough by a caller, quotes are stripped in
125  * the copy and the copy is terminated by 0.
126  *
127  * On return \a params is set to next parameter or to NULL if last
128  * parameter is returned.
129  *
130  * \retval 0 if parameter is returned in \a copy
131  * \retval 1 otherwise
132  * \retval -EINVAL if unbalanced quota is found
133  */
134 int class_get_next_param(char **params, char *copy)
135 {
136         char *q1, *q2, *str;
137         int len;
138
139         str = *params;
140         while (*str == ' ')
141                 str++;
142
143         if (*str == '\0') {
144                 *params = NULL;
145                 return 1;
146         }
147
148         while (1) {
149                 q1 = strpbrk(str, " '\"");
150                 if (q1 == NULL) {
151                         len = strlen(str);
152                         memcpy(copy, str, len);
153                         copy[len] = '\0';
154                         *params = NULL;
155                         return 0;
156                 }
157                 len = q1 - str;
158                 if (*q1 == ' ') {
159                         memcpy(copy, str, len);
160                         copy[len] = '\0';
161                         *params = str + len;
162                         return 0;
163                 }
164
165                 memcpy(copy, str, len);
166                 copy += len;
167
168                 /* search for the matching closing quote */
169                 str = q1 + 1;
170                 q2 = strchr(str, *q1);
171                 if (q2 == NULL) {
172                         CERROR("Unbalanced quota in parameters: \"%s\"\n",
173                                *params);
174                         return -EINVAL;
175                 }
176                 len = q2 - str;
177                 memcpy(copy, str, len);
178                 copy += len;
179                 str = q2 + 1;
180         }
181         return 1;
182 }
183 EXPORT_SYMBOL(class_get_next_param);
184
185 /* returns 0 if this is the first key in the buffer, else 1.
186    valp points to first char after key. */
187 int class_match_param(char *buf, const char *key, char **valp)
188 {
189         if (!buf)
190                 return 1;
191
192         if (memcmp(buf, key, strlen(key)) != 0)
193                 return 1;
194
195         if (valp)
196                 *valp = buf + strlen(key);
197
198         return 0;
199 }
200 EXPORT_SYMBOL(class_match_param);
201
202 static int parse_nid(char *buf, void *value, int quiet)
203 {
204         lnet_nid_t *nid = (lnet_nid_t *)value;
205
206         *nid = libcfs_str2nid(buf);
207         if (*nid != LNET_NID_ANY)
208                 return 0;
209
210         if (!quiet)
211                 LCONSOLE_ERROR_MSG(0x159, "Can't parse NID '%s'\n", buf);
212         return -EINVAL;
213 }
214
215 static int parse_net(char *buf, void *value)
216 {
217         __u32 *net = (__u32 *)value;
218
219         *net = libcfs_str2net(buf);
220         CDEBUG(D_INFO, "Net %s\n", libcfs_net2str(*net));
221         return 0;
222 }
223
224 enum {
225         CLASS_PARSE_NID = 1,
226         CLASS_PARSE_NET,
227 };
228
229 /* 0 is good nid,
230    1 not found
231    < 0 error
232    endh is set to next separator */
233 static int class_parse_value(char *buf, int opc, void *value, char **endh,
234                              int quiet)
235 {
236         char *endp;
237         char  tmp;
238         int   rc = 0;
239
240         if (!buf)
241                 return 1;
242         while (*buf == ',' || *buf == ':')
243                 buf++;
244         if (*buf == ' ' || *buf == '/' || *buf == '\0')
245                 return 1;
246
247         /* nid separators or end of nids */
248         endp = strpbrk(buf, ",: /");
249         if (endp == NULL)
250                 endp = buf + strlen(buf);
251
252         tmp = *endp;
253         *endp = '\0';
254         switch (opc) {
255         default:
256                 LBUG();
257         case CLASS_PARSE_NID:
258                 rc = parse_nid(buf, value, quiet);
259                 break;
260         case CLASS_PARSE_NET:
261                 rc = parse_net(buf, value);
262                 break;
263         }
264         *endp = tmp;
265         if (rc != 0)
266                 return rc;
267         if (endh)
268                 *endh = endp;
269         return 0;
270 }
271
272 int class_parse_nid(char *buf, lnet_nid_t *nid, char **endh)
273 {
274         return class_parse_value(buf, CLASS_PARSE_NID, (void *)nid, endh, 0);
275 }
276 EXPORT_SYMBOL(class_parse_nid);
277
278 int class_parse_nid_quiet(char *buf, lnet_nid_t *nid, char **endh)
279 {
280         return class_parse_value(buf, CLASS_PARSE_NID, (void *)nid, endh, 1);
281 }
282 EXPORT_SYMBOL(class_parse_nid_quiet);
283
284 int class_parse_net(char *buf, __u32 *net, char **endh)
285 {
286         return class_parse_value(buf, CLASS_PARSE_NET, (void *)net, endh, 0);
287 }
288
289 /* 1 param contains key and match
290  * 0 param contains key and not match
291  * -1 param does not contain key
292  */
293 int class_match_nid(char *buf, char *key, lnet_nid_t nid)
294 {
295         lnet_nid_t tmp;
296         int   rc = -1;
297
298         while (class_find_param(buf, key, &buf) == 0) {
299                 /* please restrict to the nids pertaining to
300                  * the specified nids */
301                 while (class_parse_nid(buf, &tmp, &buf) == 0) {
302                         if (tmp == nid)
303                                 return 1;
304                 }
305                 rc = 0;
306         }
307         return rc;
308 }
309
310 int class_match_net(char *buf, char *key, __u32 net)
311 {
312         __u32 tmp;
313         int   rc = -1;
314
315         while (class_find_param(buf, key, &buf) == 0) {
316                 /* please restrict to the nids pertaining to
317                  * the specified networks */
318                 while (class_parse_net(buf, &tmp, &buf) == 0) {
319                         if (tmp == net)
320                                 return 1;
321                 }
322                 rc = 0;
323         }
324         return rc;
325 }
326
327 char *lustre_cfg_string(struct lustre_cfg *lcfg, u32 index)
328 {
329         char *s;
330
331         if (!lcfg->lcfg_buflens[index])
332                 return NULL;
333
334         s = lustre_cfg_buf(lcfg, index);
335         if (!s)
336                 return NULL;
337
338         /*
339          * make sure it's NULL terminated, even if this kills a char
340          * of data.  Try to use the padding first though.
341          */
342         if (s[lcfg->lcfg_buflens[index] - 1] != '\0') {
343                 size_t last = ALIGN(lcfg->lcfg_buflens[index], 8) - 1;
344                 char lost;
345
346                 /* Use the smaller value */
347                 if (last > lcfg->lcfg_buflens[index])
348                         last = lcfg->lcfg_buflens[index];
349
350                 lost = s[last];
351                 s[last] = '\0';
352                 if (lost != '\0') {
353                         CWARN("Truncated buf %d to '%s' (lost '%c'...)\n",
354                               index, s, lost);
355                 }
356         }
357         return s;
358 }
359 EXPORT_SYMBOL(lustre_cfg_string);
360
361 /********************** class fns **********************/
362
363 /**
364  * Create a new obd device and set the type, name and uuid.  If successful,
365  * the new device can be accessed by either name or uuid.
366  */
367 int class_attach(struct lustre_cfg *lcfg)
368 {
369         struct obd_export *exp;
370         struct obd_device *obd = NULL;
371         char *typename, *name, *uuid;
372         int rc, len;
373         ENTRY;
374
375         if (!LUSTRE_CFG_BUFLEN(lcfg, 1)) {
376                 CERROR("No type passed!\n");
377                 RETURN(-EINVAL);
378         }
379         typename = lustre_cfg_string(lcfg, 1);
380
381         if (!LUSTRE_CFG_BUFLEN(lcfg, 0)) {
382                 CERROR("No name passed!\n");
383                 RETURN(-EINVAL);
384         }
385         name = lustre_cfg_string(lcfg, 0);
386         if (!LUSTRE_CFG_BUFLEN(lcfg, 2)) {
387                 CERROR("No UUID passed!\n");
388                 RETURN(-EINVAL);
389         }
390
391         uuid = lustre_cfg_string(lcfg, 2);
392         len = strlen(uuid);
393         if (len >= sizeof(obd->obd_uuid)) {
394                 CERROR("%s: uuid must be < %d bytes long\n",
395                        name, (int)sizeof(obd->obd_uuid));
396                 RETURN(-EINVAL);
397         }
398
399         obd = class_newdev(typename, name, uuid);
400         if (IS_ERR(obd)) { /* Already exists or out of obds */
401                 rc = PTR_ERR(obd);
402                 CERROR("Cannot create device %s of type %s : %d\n",
403                        name, typename, rc);
404                 RETURN(rc);
405         }
406         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
407                  "obd %p obd_magic %08X != %08X\n",
408                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
409         LASSERTF(strncmp(obd->obd_name, name, strlen(name)) == 0,
410                  "%p obd_name %s != %s\n", obd, obd->obd_name, name);
411
412         exp = class_new_export_self(obd, &obd->obd_uuid);
413         if (IS_ERR(exp)) {
414                 rc = PTR_ERR(exp);
415                 class_free_dev(obd);
416                 RETURN(rc);
417         }
418
419         obd->obd_self_export = exp;
420         list_del_init(&exp->exp_obd_chain_timed);
421         class_export_put(exp);
422
423         rc = class_register_device(obd);
424         if (rc != 0) {
425                 class_decref(obd, "newdev", obd);
426                 RETURN(rc);
427         }
428
429         obd->obd_attached = 1;
430         CDEBUG(D_IOCTL, "OBD: dev %d attached type %s with refcount %d\n",
431                obd->obd_minor, typename, atomic_read(&obd->obd_refcount));
432
433         RETURN(0);
434 }
435 EXPORT_SYMBOL(class_attach);
436
437 /** Create hashes, self-export, and call type-specific setup.
438  * Setup is effectively the "start this obd" call.
439  */
440 int class_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
441 {
442         int err = 0;
443         ENTRY;
444
445         LASSERT(obd != NULL);
446         LASSERTF(obd == class_num2obd(obd->obd_minor),
447                  "obd %p != obd_devs[%d] %p\n",
448                  obd, obd->obd_minor, class_num2obd(obd->obd_minor));
449         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
450                  "obd %p obd_magic %08x != %08x\n",
451                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
452
453         /* have we attached a type to this device? */
454         if (!obd->obd_attached) {
455                 CERROR("Device %d not attached\n", obd->obd_minor);
456                 RETURN(-ENODEV);
457         }
458
459         if (obd->obd_set_up) {
460                 CERROR("Device %d already setup (type %s)\n",
461                        obd->obd_minor, obd->obd_type->typ_name);
462                 RETURN(-EEXIST);
463         }
464
465         /* is someone else setting us up right now? (attach inits spinlock) */
466         spin_lock(&obd->obd_dev_lock);
467         if (obd->obd_starting) {
468                 spin_unlock(&obd->obd_dev_lock);
469                 CERROR("Device %d setup in progress (type %s)\n",
470                        obd->obd_minor, obd->obd_type->typ_name);
471                 RETURN(-EEXIST);
472         }
473         /* just leave this on forever.  I can't use obd_set_up here because
474            other fns check that status, and we're not actually set up yet. */
475         obd->obd_starting = 1;
476         obd->obd_uuid_hash = NULL;
477         obd->obd_nid_hash = NULL;
478         obd->obd_nid_stats_hash = NULL;
479         obd->obd_gen_hash = NULL;
480         spin_unlock(&obd->obd_dev_lock);
481
482         /* create an uuid-export lustre hash */
483         obd->obd_uuid_hash = cfs_hash_create("UUID_HASH",
484                                              HASH_UUID_CUR_BITS,
485                                              HASH_UUID_MAX_BITS,
486                                              HASH_UUID_BKT_BITS, 0,
487                                              CFS_HASH_MIN_THETA,
488                                              CFS_HASH_MAX_THETA,
489                                              &uuid_hash_ops, CFS_HASH_DEFAULT);
490         if (!obd->obd_uuid_hash)
491                 GOTO(err_exit, err = -ENOMEM);
492
493         /* create a nid-export lustre hash */
494         obd->obd_nid_hash = cfs_hash_create("NID_HASH",
495                                             HASH_NID_CUR_BITS,
496                                             HASH_NID_MAX_BITS,
497                                             HASH_NID_BKT_BITS, 0,
498                                             CFS_HASH_MIN_THETA,
499                                             CFS_HASH_MAX_THETA,
500                                             &nid_hash_ops, CFS_HASH_DEFAULT);
501         if (!obd->obd_nid_hash)
502                 GOTO(err_exit, err = -ENOMEM);
503
504         /* create a nid-stats lustre hash */
505         obd->obd_nid_stats_hash = cfs_hash_create("NID_STATS",
506                                                   HASH_NID_STATS_CUR_BITS,
507                                                   HASH_NID_STATS_MAX_BITS,
508                                                   HASH_NID_STATS_BKT_BITS, 0,
509                                                   CFS_HASH_MIN_THETA,
510                                                   CFS_HASH_MAX_THETA,
511                                                   &nid_stat_hash_ops, CFS_HASH_DEFAULT);
512         if (!obd->obd_nid_stats_hash)
513                 GOTO(err_exit, err = -ENOMEM);
514
515         /* create a client_generation-export lustre hash */
516         obd->obd_gen_hash = cfs_hash_create("UUID_HASH",
517                                             HASH_GEN_CUR_BITS,
518                                             HASH_GEN_MAX_BITS,
519                                             HASH_GEN_BKT_BITS, 0,
520                                             CFS_HASH_MIN_THETA,
521                                             CFS_HASH_MAX_THETA,
522                                             &gen_hash_ops, CFS_HASH_DEFAULT);
523         if (!obd->obd_gen_hash)
524                 GOTO(err_exit, err = -ENOMEM);
525
526         err = obd_setup(obd, lcfg);
527         if (err)
528                 GOTO(err_exit, err);
529
530         obd->obd_set_up = 1;
531
532         spin_lock(&obd->obd_dev_lock);
533         /* cleanup drops this */
534         class_incref(obd, "setup", obd);
535         spin_unlock(&obd->obd_dev_lock);
536
537         CDEBUG(D_IOCTL, "finished setup of obd %s (uuid %s)\n",
538                obd->obd_name, obd->obd_uuid.uuid);
539
540         RETURN(0);
541 err_exit:
542         if (obd->obd_uuid_hash) {
543                 cfs_hash_putref(obd->obd_uuid_hash);
544                 obd->obd_uuid_hash = NULL;
545         }
546         if (obd->obd_nid_hash) {
547                 cfs_hash_putref(obd->obd_nid_hash);
548                 obd->obd_nid_hash = NULL;
549         }
550         if (obd->obd_nid_stats_hash) {
551                 cfs_hash_putref(obd->obd_nid_stats_hash);
552                 obd->obd_nid_stats_hash = NULL;
553         }
554         if (obd->obd_gen_hash) {
555                 cfs_hash_putref(obd->obd_gen_hash);
556                 obd->obd_gen_hash = NULL;
557         }
558         obd->obd_starting = 0;
559         CERROR("setup %s failed (%d)\n", obd->obd_name, err);
560         return err;
561 }
562 EXPORT_SYMBOL(class_setup);
563
564 /** We have finished using this obd and are ready to destroy it.
565  * There can be no more references to this obd.
566  */
567 int class_detach(struct obd_device *obd, struct lustre_cfg *lcfg)
568 {
569         ENTRY;
570
571         if (obd->obd_set_up) {
572                 CERROR("OBD device %d still set up\n", obd->obd_minor);
573                 RETURN(-EBUSY);
574         }
575
576         spin_lock(&obd->obd_dev_lock);
577         if (!obd->obd_attached) {
578                 spin_unlock(&obd->obd_dev_lock);
579                 CERROR("OBD device %d not attached\n", obd->obd_minor);
580                 RETURN(-ENODEV);
581         }
582         obd->obd_attached = 0;
583         spin_unlock(&obd->obd_dev_lock);
584
585         /* cleanup in progress. we don't like to find this device after now */
586         class_unregister_device(obd);
587
588         CDEBUG(D_IOCTL, "detach on obd %s (uuid %s)\n",
589                obd->obd_name, obd->obd_uuid.uuid);
590
591         class_decref(obd, "newdev", obd);
592
593         RETURN(0);
594 }
595 EXPORT_SYMBOL(class_detach);
596
597 /** Start shutting down the obd.  There may be in-progess ops when
598  * this is called.  We tell them to start shutting down with a call
599  * to class_disconnect_exports().
600  */
601 int class_cleanup(struct obd_device *obd, struct lustre_cfg *lcfg)
602 {
603         int err = 0;
604         char *flag;
605         ENTRY;
606
607         OBD_RACE(OBD_FAIL_LDLM_RECOV_CLIENTS);
608
609         if (!obd->obd_set_up) {
610                 CERROR("Device %d not setup\n", obd->obd_minor);
611                 RETURN(-ENODEV);
612         }
613
614         spin_lock(&obd->obd_dev_lock);
615         if (obd->obd_stopping) {
616                 spin_unlock(&obd->obd_dev_lock);
617                 CERROR("OBD %d already stopping\n", obd->obd_minor);
618                 RETURN(-ENODEV);
619         }
620         /* Leave this on forever */
621         obd->obd_stopping = 1;
622         /* function can't return error after that point, so clear setup flag
623          * as early as possible to avoid finding via obd_devs / hash */
624         obd->obd_set_up = 0;
625         spin_unlock(&obd->obd_dev_lock);
626
627         /* wait for already-arrived-connections to finish. */
628         while (obd->obd_conn_inprogress > 0)
629                 yield();
630         smp_rmb();
631
632         if (lcfg->lcfg_bufcount >= 2 && LUSTRE_CFG_BUFLEN(lcfg, 1) > 0) {
633                 for (flag = lustre_cfg_string(lcfg, 1); *flag != 0; flag++)
634                         switch (*flag) {
635                         case 'F':
636                                 obd->obd_force = 1;
637                                 break;
638                         case 'A':
639                                 LCONSOLE_WARN("Failing over %s\n",
640                                               obd->obd_name);
641                                 obd->obd_fail = 1;
642                                 obd->obd_no_transno = 1;
643                                 obd->obd_no_recov = 1;
644                                 if (OBP(obd, iocontrol)) {
645                                         obd_iocontrol(OBD_IOC_SYNC,
646                                                       obd->obd_self_export,
647                                                       0, NULL, NULL);
648                                 }
649                                 break;
650                         default:
651                                 CERROR("Unrecognised flag '%c'\n", *flag);
652                         }
653         }
654
655         LASSERT(obd->obd_self_export);
656
657         CDEBUG(D_IOCTL, "%s: forcing exports to disconnect: %d/%d\n",
658                obd->obd_name, obd->obd_num_exports,
659                atomic_read(&obd->obd_refcount) - 2);
660         dump_exports(obd, 0, D_HA);
661         class_disconnect_exports(obd);
662
663         /* Precleanup, we must make sure all exports get destroyed. */
664         err = obd_precleanup(obd);
665         if (err)
666                 CERROR("Precleanup %s returned %d\n",
667                        obd->obd_name, err);
668
669         /* destroy an uuid-export hash body */
670         if (obd->obd_uuid_hash) {
671                 cfs_hash_putref(obd->obd_uuid_hash);
672                 obd->obd_uuid_hash = NULL;
673         }
674
675         /* destroy a nid-export hash body */
676         if (obd->obd_nid_hash) {
677                 cfs_hash_putref(obd->obd_nid_hash);
678                 obd->obd_nid_hash = NULL;
679         }
680
681         /* destroy a nid-stats hash body */
682         if (obd->obd_nid_stats_hash) {
683                 cfs_hash_putref(obd->obd_nid_stats_hash);
684                 obd->obd_nid_stats_hash = NULL;
685         }
686
687         /* destroy a client_generation-export hash body */
688         if (obd->obd_gen_hash) {
689                 cfs_hash_putref(obd->obd_gen_hash);
690                 obd->obd_gen_hash = NULL;
691         }
692
693         class_decref(obd, "setup", obd);
694         obd->obd_set_up = 0;
695
696         RETURN(0);
697 }
698
699 struct obd_device *class_incref(struct obd_device *obd,
700                                 const char *scope, const void *source)
701 {
702         lu_ref_add_atomic(&obd->obd_reference, scope, source);
703         atomic_inc(&obd->obd_refcount);
704         CDEBUG(D_INFO, "incref %s (%p) now %d\n", obd->obd_name, obd,
705                atomic_read(&obd->obd_refcount));
706
707         return obd;
708 }
709 EXPORT_SYMBOL(class_incref);
710
711 void class_decref(struct obd_device *obd, const char *scope, const void *source)
712 {
713         int last;
714
715         CDEBUG(D_INFO, "Decref %s (%p) now %d - %s\n", obd->obd_name, obd,
716                atomic_read(&obd->obd_refcount), scope);
717
718         LASSERT(obd->obd_num_exports >= 0);
719         last = atomic_dec_and_test(&obd->obd_refcount);
720         lu_ref_del(&obd->obd_reference, scope, source);
721
722         if (last) {
723                 struct obd_export *exp;
724
725                 LASSERT(!obd->obd_attached);
726                 /* All exports have been destroyed; there should
727                  * be no more in-progress ops by this point.*/
728                 exp = obd->obd_self_export;
729
730                 if (exp) {
731                         exp->exp_flags |= exp_flags_from_obd(obd);
732                         class_unlink_export(exp);
733                 }
734         }
735 }
736 EXPORT_SYMBOL(class_decref);
737
738 /** Add a failover nid location.
739  * Client obd types contact server obd types using this nid list.
740  */
741 int class_add_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
742 {
743         struct obd_import *imp;
744         struct obd_uuid uuid;
745         int rc;
746         ENTRY;
747
748         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
749             LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(struct obd_uuid)) {
750                 CERROR("invalid conn_uuid\n");
751                 RETURN(-EINVAL);
752         }
753         if (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) &&
754             strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME) &&
755             strcmp(obd->obd_type->typ_name, LUSTRE_OSP_NAME) &&
756             strcmp(obd->obd_type->typ_name, LUSTRE_LWP_NAME) &&
757             strcmp(obd->obd_type->typ_name, LUSTRE_MGC_NAME)) {
758                 CERROR("can't add connection on non-client dev\n");
759                 RETURN(-EINVAL);
760         }
761
762         imp = obd->u.cli.cl_import;
763         if (!imp) {
764                 CERROR("try to add conn on immature client dev\n");
765                 RETURN(-EINVAL);
766         }
767
768         obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
769         rc = obd_add_conn(imp, &uuid, lcfg->lcfg_num);
770
771         RETURN(rc);
772 }
773
774 /** Remove a failover nid location.
775  */
776 static int class_del_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
777 {
778         struct obd_import *imp;
779         struct obd_uuid uuid;
780         int rc;
781         ENTRY;
782
783         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
784             LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(struct obd_uuid)) {
785                 CERROR("invalid conn_uuid\n");
786                 RETURN(-EINVAL);
787         }
788         if (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) &&
789             strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME)) {
790                 CERROR("can't del connection on non-client dev\n");
791                 RETURN(-EINVAL);
792         }
793
794         imp = obd->u.cli.cl_import;
795         if (!imp) {
796                 CERROR("try to del conn on immature client dev\n");
797                 RETURN(-EINVAL);
798         }
799
800         obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
801         rc = obd_del_conn(imp, &uuid);
802
803         RETURN(rc);
804 }
805
806 static LIST_HEAD(lustre_profile_list);
807 static DEFINE_SPINLOCK(lustre_profile_list_lock);
808
809 struct lustre_profile *class_get_profile(const char * prof)
810 {
811         struct lustre_profile *lprof;
812
813         ENTRY;
814         spin_lock(&lustre_profile_list_lock);
815         list_for_each_entry(lprof, &lustre_profile_list, lp_list) {
816                 if (!strcmp(lprof->lp_profile, prof)) {
817                         lprof->lp_refs++;
818                         spin_unlock(&lustre_profile_list_lock);
819                         RETURN(lprof);
820                 }
821         }
822         spin_unlock(&lustre_profile_list_lock);
823         RETURN(NULL);
824 }
825 EXPORT_SYMBOL(class_get_profile);
826
827 /** Create a named "profile".
828  * This defines the mdc and osc names to use for a client.
829  * This also is used to define the lov to be used by a mdt.
830  */
831 static int class_add_profile(int proflen, char *prof, int osclen, char *osc,
832                              int mdclen, char *mdc)
833 {
834         struct lustre_profile *lprof;
835         int err = 0;
836         ENTRY;
837
838         CDEBUG(D_CONFIG, "Add profile %s\n", prof);
839
840         OBD_ALLOC(lprof, sizeof(*lprof));
841         if (lprof == NULL)
842                 RETURN(-ENOMEM);
843         INIT_LIST_HEAD(&lprof->lp_list);
844
845         LASSERT(proflen == (strlen(prof) + 1));
846         OBD_ALLOC(lprof->lp_profile, proflen);
847         if (lprof->lp_profile == NULL)
848                 GOTO(out, err = -ENOMEM);
849         memcpy(lprof->lp_profile, prof, proflen);
850
851         LASSERT(osclen == (strlen(osc) + 1));
852         OBD_ALLOC(lprof->lp_dt, osclen);
853         if (lprof->lp_dt == NULL)
854                 GOTO(out, err = -ENOMEM);
855         memcpy(lprof->lp_dt, osc, osclen);
856
857         if (mdclen > 0) {
858                 LASSERT(mdclen == (strlen(mdc) + 1));
859                 OBD_ALLOC(lprof->lp_md, mdclen);
860                 if (lprof->lp_md == NULL)
861                         GOTO(out, err = -ENOMEM);
862                 memcpy(lprof->lp_md, mdc, mdclen);
863         }
864
865         spin_lock(&lustre_profile_list_lock);
866         lprof->lp_refs = 1;
867         lprof->lp_list_deleted = false;
868
869         list_add(&lprof->lp_list, &lustre_profile_list);
870         spin_unlock(&lustre_profile_list_lock);
871         RETURN(err);
872
873 out:
874         if (lprof->lp_md)
875                 OBD_FREE(lprof->lp_md, mdclen);
876         if (lprof->lp_dt)
877                 OBD_FREE(lprof->lp_dt, osclen);
878         if (lprof->lp_profile)
879                 OBD_FREE(lprof->lp_profile, proflen);
880         OBD_FREE(lprof, sizeof(*lprof));
881         RETURN(err);
882 }
883
884 void class_del_profile(const char *prof)
885 {
886         struct lustre_profile *lprof;
887         ENTRY;
888
889         CDEBUG(D_CONFIG, "Del profile %s\n", prof);
890
891         lprof = class_get_profile(prof);
892         if (lprof) {
893                 spin_lock(&lustre_profile_list_lock);
894                 /* because get profile increments the ref counter */
895                 lprof->lp_refs--;
896                 list_del(&lprof->lp_list);
897                 lprof->lp_list_deleted = true;
898                 spin_unlock(&lustre_profile_list_lock);
899
900                 class_put_profile(lprof);
901         }
902         EXIT;
903 }
904 EXPORT_SYMBOL(class_del_profile);
905
906 void class_put_profile(struct lustre_profile *lprof)
907 {
908         spin_lock(&lustre_profile_list_lock);
909         if ((--lprof->lp_refs) > 0) {
910                 LASSERT(lprof->lp_refs > 0);
911                 spin_unlock(&lustre_profile_list_lock);
912                 return;
913         }
914         spin_unlock(&lustre_profile_list_lock);
915
916         /* confirm not a negative number */
917         LASSERT(lprof->lp_refs == 0);
918
919         /* At least one class_del_profile/profiles must be called
920          * on the target profile or lustre_profile_list will corrupt */
921         LASSERT(lprof->lp_list_deleted);
922         OBD_FREE(lprof->lp_profile, strlen(lprof->lp_profile) + 1);
923         OBD_FREE(lprof->lp_dt, strlen(lprof->lp_dt) + 1);
924         if (lprof->lp_md != NULL)
925                 OBD_FREE(lprof->lp_md, strlen(lprof->lp_md) + 1);
926         OBD_FREE(lprof, sizeof(*lprof));
927 }
928 EXPORT_SYMBOL(class_put_profile);
929
930 /* COMPAT_146 */
931 void class_del_profiles(void)
932 {
933         struct lustre_profile *lprof, *n;
934         ENTRY;
935
936         spin_lock(&lustre_profile_list_lock);
937         list_for_each_entry_safe(lprof, n, &lustre_profile_list, lp_list) {
938                 list_del(&lprof->lp_list);
939                 lprof->lp_list_deleted = true;
940                 spin_unlock(&lustre_profile_list_lock);
941
942                 class_put_profile(lprof);
943
944                 spin_lock(&lustre_profile_list_lock);
945         }
946         spin_unlock(&lustre_profile_list_lock);
947         EXIT;
948 }
949 EXPORT_SYMBOL(class_del_profiles);
950
951 /* We can't call lquota_process_config directly because
952  * it lives in a module that must be loaded after this one.
953  */
954 #ifdef HAVE_SERVER_SUPPORT
955 static int (*quota_process_config)(struct lustre_cfg *lcfg) = NULL;
956 #endif /* HAVE_SERVER_SUPPORT */
957
958 /**
959  * Rename the proc parameter in \a cfg with a new name \a new_name.
960  *
961  * \param cfg      config structure which contains the proc parameter
962  * \param new_name new name of the proc parameter
963  *
964  * \retval valid-pointer    pointer to the newly-allocated config structure
965  *                          which contains the renamed proc parameter
966  * \retval ERR_PTR(-EINVAL) if \a cfg or \a new_name is NULL, or \a cfg does
967  *                          not contain a proc parameter
968  * \retval ERR_PTR(-ENOMEM) if memory allocation failure occurs
969  */
970 struct lustre_cfg *lustre_cfg_rename(struct lustre_cfg *cfg,
971                                      const char *new_name)
972 {
973         struct lustre_cfg_bufs  *bufs = NULL;
974         struct lustre_cfg       *new_cfg = NULL;
975         char                    *param = NULL;
976         char                    *new_param = NULL;
977         char                    *value = NULL;
978         int                      name_len = 0;
979         int                      new_len = 0;
980         ENTRY;
981
982         if (!cfg || !new_name)
983                 GOTO(out_nocfg, new_cfg = ERR_PTR(-EINVAL));
984
985         param = lustre_cfg_string(cfg, 1);
986         if (!param)
987                 GOTO(out_nocfg, new_cfg = ERR_PTR(-EINVAL));
988
989         value = strchr(param, '=');
990         if (value == NULL)
991                 name_len = strlen(param);
992         else
993                 name_len = value - param;
994
995         new_len = LUSTRE_CFG_BUFLEN(cfg, 1) + strlen(new_name) - name_len;
996
997         OBD_ALLOC(new_param, new_len);
998         if (!new_param)
999                 GOTO(out_nocfg, new_cfg = ERR_PTR(-ENOMEM));
1000
1001         strcpy(new_param, new_name);
1002         if (value != NULL)
1003                 strcat(new_param, value);
1004
1005         OBD_ALLOC_PTR(bufs);
1006         if (!bufs)
1007                 GOTO(out_free_param, new_cfg = ERR_PTR(-ENOMEM));
1008
1009         lustre_cfg_bufs_reset(bufs, NULL);
1010         lustre_cfg_bufs_init(bufs, cfg);
1011         lustre_cfg_bufs_set_string(bufs, 1, new_param);
1012
1013         OBD_ALLOC(new_cfg, lustre_cfg_len(bufs->lcfg_bufcount,
1014                                           bufs->lcfg_buflen));
1015         if (!new_cfg)
1016                 GOTO(out_free_buf, new_cfg = ERR_PTR(-ENOMEM));
1017
1018         lustre_cfg_init(new_cfg, cfg->lcfg_command, bufs);
1019
1020         new_cfg->lcfg_num = cfg->lcfg_num;
1021         new_cfg->lcfg_flags = cfg->lcfg_flags;
1022         new_cfg->lcfg_nid = cfg->lcfg_nid;
1023         new_cfg->lcfg_nal = cfg->lcfg_nal;
1024 out_free_buf:
1025         OBD_FREE_PTR(bufs);
1026 out_free_param:
1027         OBD_FREE(new_param, new_len);
1028 out_nocfg:
1029         RETURN(new_cfg);
1030 }
1031 EXPORT_SYMBOL(lustre_cfg_rename);
1032
1033 static ssize_t process_param2_config(struct lustre_cfg *lcfg)
1034 {
1035         char *param = lustre_cfg_string(lcfg, 1);
1036         char *upcall = lustre_cfg_string(lcfg, 2);
1037         struct kobject *kobj = NULL;
1038         const char *subsys = param;
1039         char *argv[] = {
1040                 [0] = "/usr/sbin/lctl",
1041                 [1] = "set_param",
1042                 [2] = param,
1043                 [3] = NULL
1044         };
1045         ktime_t start;
1046         ktime_t end;
1047         size_t len;
1048         int rc;
1049
1050         ENTRY;
1051         print_lustre_cfg(lcfg);
1052
1053         len = strcspn(param, ".=");
1054         if (!len)
1055                 return -EINVAL;
1056
1057         /* If we find '=' then its the top level sysfs directory */
1058         if (param[len] == '=')
1059                 return class_set_global(param);
1060
1061         subsys = kstrndup(param, len, GFP_KERNEL);
1062         if (!subsys)
1063                 return -ENOMEM;
1064
1065         kobj = kset_find_obj(lustre_kset, subsys);
1066         kfree(subsys);
1067         if (kobj) {
1068                 char *value = param;
1069                 char *envp[3];
1070                 int i;
1071
1072                 param = strsep(&value, "=");
1073                 envp[0] = kasprintf(GFP_KERNEL, "PARAM=%s", param);
1074                 envp[1] = kasprintf(GFP_KERNEL, "SETTING=%s", value);
1075                 envp[2] = NULL;
1076
1077                 rc = kobject_uevent_env(kobj, KOBJ_CHANGE, envp);
1078                 for (i = 0; i < ARRAY_SIZE(envp); i++)
1079                         kfree(envp[i]);
1080
1081                 kobject_put(kobj);
1082
1083                 RETURN(rc);
1084         }
1085
1086         /* Add upcall processing here. Now only lctl is supported */
1087         if (strcmp(upcall, LCTL_UPCALL) != 0) {
1088                 CERROR("Unsupported upcall %s\n", upcall);
1089                 RETURN(-EINVAL);
1090         }
1091
1092         start = ktime_get();
1093         rc = call_usermodehelper(argv[0], argv, NULL, UMH_WAIT_PROC);
1094         end = ktime_get();
1095
1096         if (rc < 0) {
1097                 CERROR("lctl: error invoking upcall %s %s %s: rc = %d; "
1098                        "time %ldus\n", argv[0], argv[1], argv[2], rc,
1099                        (long)ktime_us_delta(end, start));
1100         } else {
1101                 CDEBUG(D_HA, "lctl: invoked upcall %s %s %s, time %ldus\n",
1102                        argv[0], argv[1], argv[2],
1103                        (long)ktime_us_delta(end, start));
1104                        rc = 0;
1105         }
1106
1107         RETURN(rc);
1108 }
1109
1110 #ifdef HAVE_SERVER_SUPPORT
1111 void lustre_register_quota_process_config(int (*qpc)(struct lustre_cfg *lcfg))
1112 {
1113         quota_process_config = qpc;
1114 }
1115 EXPORT_SYMBOL(lustre_register_quota_process_config);
1116 #endif /* HAVE_SERVER_SUPPORT */
1117
1118 /** Process configuration commands given in lustre_cfg form.
1119  * These may come from direct calls (e.g. class_manual_cleanup)
1120  * or processing the config llog, or ioctl from lctl.
1121  */
1122 int class_process_config(struct lustre_cfg *lcfg)
1123 {
1124         struct obd_device *obd;
1125         int err;
1126
1127         LASSERT(lcfg && !IS_ERR(lcfg));
1128         CDEBUG(D_IOCTL, "processing cmd: %x\n", lcfg->lcfg_command);
1129
1130         /* Commands that don't need a device */
1131         switch(lcfg->lcfg_command) {
1132         case LCFG_ATTACH: {
1133                 err = class_attach(lcfg);
1134                 GOTO(out, err);
1135         }
1136         case LCFG_ADD_UUID: {
1137                 CDEBUG(D_IOCTL, "adding mapping from uuid %s to nid %#llx"
1138                        " (%s)\n", lustre_cfg_string(lcfg, 1),
1139                        lcfg->lcfg_nid, libcfs_nid2str(lcfg->lcfg_nid));
1140
1141                 err = class_add_uuid(lustre_cfg_string(lcfg, 1), lcfg->lcfg_nid);
1142                 GOTO(out, err);
1143         }
1144         case LCFG_DEL_UUID: {
1145                 CDEBUG(D_IOCTL, "removing mappings for uuid %s\n",
1146                        (lcfg->lcfg_bufcount < 2 || LUSTRE_CFG_BUFLEN(lcfg, 1) == 0)
1147                        ? "<all uuids>" : lustre_cfg_string(lcfg, 1));
1148
1149                 err = class_del_uuid(lustre_cfg_string(lcfg, 1));
1150                 GOTO(out, err);
1151         }
1152         case LCFG_MOUNTOPT: {
1153                 CDEBUG(D_IOCTL, "mountopt: profile %s osc %s mdc %s\n",
1154                        lustre_cfg_string(lcfg, 1),
1155                        lustre_cfg_string(lcfg, 2),
1156                        lustre_cfg_string(lcfg, 3));
1157                 /* set these mount options somewhere, so ll_fill_super
1158                  * can find them. */
1159                 err = class_add_profile(LUSTRE_CFG_BUFLEN(lcfg, 1),
1160                                         lustre_cfg_string(lcfg, 1),
1161                                         LUSTRE_CFG_BUFLEN(lcfg, 2),
1162                                         lustre_cfg_string(lcfg, 2),
1163                                         LUSTRE_CFG_BUFLEN(lcfg, 3),
1164                                         lustre_cfg_string(lcfg, 3));
1165                 GOTO(out, err);
1166         }
1167         case LCFG_DEL_MOUNTOPT: {
1168                 CDEBUG(D_IOCTL, "mountopt: profile %s\n",
1169                        lustre_cfg_string(lcfg, 1));
1170                 class_del_profile(lustre_cfg_string(lcfg, 1));
1171                 GOTO(out, err = 0);
1172         }
1173         case LCFG_SET_TIMEOUT: {
1174                 CDEBUG(D_IOCTL, "changing lustre timeout from %d to %d\n",
1175                        obd_timeout, lcfg->lcfg_num);
1176                 obd_timeout = max(lcfg->lcfg_num, 1U);
1177                 obd_timeout_set = 1;
1178                 GOTO(out, err = 0);
1179         }
1180         case LCFG_SET_LDLM_TIMEOUT: {
1181                 CDEBUG(D_IOCTL, "changing lustre ldlm_timeout from %d to %d\n",
1182                        ldlm_timeout, lcfg->lcfg_num);
1183                 ldlm_timeout = max(lcfg->lcfg_num, 1U);
1184                 if (ldlm_timeout >= obd_timeout)
1185                         ldlm_timeout = max(obd_timeout / 3, 1U);
1186                 ldlm_timeout_set = 1;
1187                 GOTO(out, err = 0);
1188         }
1189         case LCFG_SET_UPCALL: {
1190                 LCONSOLE_ERROR_MSG(0x15a, "recovery upcall is deprecated\n");
1191                 /* COMPAT_146 Don't fail on old configs */
1192                 GOTO(out, err = 0);
1193         }
1194         case LCFG_MARKER: {
1195                 struct cfg_marker *marker;
1196                 marker = lustre_cfg_buf(lcfg, 1);
1197                 CDEBUG(D_IOCTL, "marker %d (%#x) %.16s %s\n", marker->cm_step,
1198                        marker->cm_flags, marker->cm_tgtname, marker->cm_comment);
1199                 GOTO(out, err = 0);
1200         }
1201         case LCFG_PARAM: {
1202                 char *tmp;
1203
1204                 /* llite has no obd */
1205                 if (class_match_param(lustre_cfg_string(lcfg, 1),
1206                                       PARAM_LLITE, NULL) == 0) {
1207                         struct lustre_sb_info *lsi;
1208                         unsigned long addr;
1209                         ssize_t count;
1210
1211                         /* The instance name contains the sb:
1212                          * lustre-client-aacfe000
1213                          */
1214                         tmp = strrchr(lustre_cfg_string(lcfg, 0), '-');
1215                         if (!tmp || !*(++tmp))
1216                                 GOTO(out, err = -EINVAL);
1217
1218                         if (sscanf(tmp, "%lx", &addr) != 1)
1219                                 GOTO(out, err = -EINVAL);
1220
1221                         lsi = s2lsi((struct super_block *)addr);
1222                         /* This better be a real Lustre superblock! */
1223                         LASSERT(lsi->lsi_lmd->lmd_magic == LMD_MAGIC);
1224
1225                         count = class_modify_config(lcfg, PARAM_LLITE,
1226                                                     lsi->lsi_kobj);
1227                         err = count < 0 ? count : 0;
1228                         GOTO(out, err);
1229                 } else if ((class_match_param(lustre_cfg_string(lcfg, 1),
1230                                               PARAM_SYS, &tmp) == 0)) {
1231                         /* Global param settings */
1232                         err = class_set_global(tmp);
1233                         /*
1234                          * Client or server should not fail to mount if
1235                          * it hits an unknown configuration parameter.
1236                          */
1237                         if (err < 0)
1238                                 CWARN("Ignoring unknown param %s\n", tmp);
1239
1240                         GOTO(out, err = 0);
1241 #ifdef HAVE_SERVER_SUPPORT
1242                 } else if ((class_match_param(lustre_cfg_string(lcfg, 1),
1243                                               PARAM_QUOTA, &tmp) == 0) &&
1244                            quota_process_config) {
1245                         err = (*quota_process_config)(lcfg);
1246                         GOTO(out, err);
1247 #endif /* HAVE_SERVER_SUPPORT */
1248                 }
1249
1250                 break;
1251         }
1252         case LCFG_SET_PARAM: {
1253                 err = process_param2_config(lcfg);
1254                 GOTO(out, err = 0);
1255         }
1256         }
1257         /* Commands that require a device */
1258         obd = class_name2obd(lustre_cfg_string(lcfg, 0));
1259         if (obd == NULL) {
1260                 if (!LUSTRE_CFG_BUFLEN(lcfg, 0))
1261                         CERROR("this lcfg command requires a device name\n");
1262                 else
1263                         CERROR("no device for: %s\n",
1264                                lustre_cfg_string(lcfg, 0));
1265
1266                 GOTO(out, err = -EINVAL);
1267         }
1268         switch(lcfg->lcfg_command) {
1269         case LCFG_SETUP: {
1270                 err = class_setup(obd, lcfg);
1271                 GOTO(out, err);
1272         }
1273         case LCFG_DETACH: {
1274                 err = class_detach(obd, lcfg);
1275                 GOTO(out, err = 0);
1276         }
1277         case LCFG_CLEANUP: {
1278                 err = class_cleanup(obd, lcfg);
1279                 GOTO(out, err = 0);
1280         }
1281         case LCFG_ADD_CONN: {
1282                 err = class_add_conn(obd, lcfg);
1283                 GOTO(out, err = 0);
1284         }
1285         case LCFG_DEL_CONN: {
1286                 err = class_del_conn(obd, lcfg);
1287                 GOTO(out, err = 0);
1288         }
1289         case LCFG_POOL_NEW: {
1290                 err = obd_pool_new(obd, lustre_cfg_string(lcfg, 2));
1291                 GOTO(out, err = 0);
1292         }
1293         case LCFG_POOL_ADD: {
1294                 err = obd_pool_add(obd, lustre_cfg_string(lcfg, 2),
1295                                    lustre_cfg_string(lcfg, 3));
1296                 GOTO(out, err = 0);
1297         }
1298         case LCFG_POOL_REM: {
1299                 err = obd_pool_rem(obd, lustre_cfg_string(lcfg, 2),
1300                                    lustre_cfg_string(lcfg, 3));
1301                 GOTO(out, err = 0);
1302         }
1303         case LCFG_POOL_DEL: {
1304                 err = obd_pool_del(obd, lustre_cfg_string(lcfg, 2));
1305                 GOTO(out, err = 0);
1306         }
1307         /* Process config log ADD_MDC record twice to add MDC also to LOV
1308          * for Data-on-MDT:
1309          *
1310          * add 0:lustre-clilmv 1:lustre-MDT0000_UUID 2:0 3:1
1311          *     4:lustre-MDT0000-mdc_UUID
1312          */
1313         case LCFG_ADD_MDC: {
1314                 struct obd_device *lov_obd;
1315                 char *clilmv;
1316
1317                 err = obd_process_config(obd, sizeof(*lcfg), lcfg);
1318                 if (err)
1319                         GOTO(out, err);
1320
1321                 /* make sure this is client LMV log entry */
1322                 clilmv = strstr(lustre_cfg_string(lcfg, 0), "clilmv");
1323                 if (!clilmv)
1324                         GOTO(out, err);
1325
1326                 /* replace 'lmv' with 'lov' name to address LOV device and
1327                  * process llog record to add MDC there. */
1328                 clilmv[4] = 'o';
1329                 lov_obd = class_name2obd(lustre_cfg_string(lcfg, 0));
1330                 if (lov_obd == NULL) {
1331                         err = -ENOENT;
1332                         CERROR("%s: Cannot find LOV by %s name, rc = %d\n",
1333                                obd->obd_name, lustre_cfg_string(lcfg, 0), err);
1334                 } else {
1335                         err = obd_process_config(lov_obd, sizeof(*lcfg), lcfg);
1336                 }
1337                 /* restore 'lmv' name */
1338                 clilmv[4] = 'm';
1339                 GOTO(out, err);
1340         }
1341         default: {
1342                 err = obd_process_config(obd, sizeof(*lcfg), lcfg);
1343                 GOTO(out, err);
1344
1345         }
1346         }
1347         EXIT;
1348 out:
1349         if ((err < 0) && !(lcfg->lcfg_command & LCFG_REQUIRED)) {
1350                 CWARN("Ignoring error %d on optional command %#x\n", err,
1351                       lcfg->lcfg_command);
1352                 err = 0;
1353         }
1354         return err;
1355 }
1356 EXPORT_SYMBOL(class_process_config);
1357
1358 ssize_t class_modify_config(struct lustre_cfg *lcfg, const char *prefix,
1359                             struct kobject *kobj)
1360 {
1361         struct kobj_type *typ;
1362         ssize_t count = 0;
1363         int i;
1364
1365         if (lcfg->lcfg_command != LCFG_PARAM) {
1366                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1367                 return -EINVAL;
1368         }
1369
1370         typ = get_ktype(kobj);
1371         if (!typ || !typ->default_attrs)
1372                 return -ENODEV;
1373
1374         print_lustre_cfg(lcfg);
1375
1376         /*
1377          * e.g. tunefs.lustre --param mdt.group_upcall=foo /r/tmp/lustre-mdt
1378          * or   lctl conf_param lustre-MDT0000.mdt.group_upcall=bar
1379          * or   lctl conf_param lustre-OST0000.osc.max_dirty_mb=36
1380          */
1381         for (i = 1; i < lcfg->lcfg_bufcount; i++) {
1382                 struct attribute *attr;
1383                 size_t keylen;
1384                 char *value;
1385                 char *key;
1386                 int j;
1387
1388                 key = lustre_cfg_buf(lcfg, i);
1389                 /* Strip off prefix */
1390                 if (class_match_param(key, prefix, &key))
1391                         /* If the prefix doesn't match, return error so we
1392                          * can pass it down the stack
1393                          */
1394                         return -EINVAL;
1395
1396                 value = strchr(key, '=');
1397                 if (!value || *(value + 1) == 0) {
1398                         CERROR("%s: can't parse param '%s' (missing '=')\n",
1399                                lustre_cfg_string(lcfg, 0),
1400                                lustre_cfg_string(lcfg, i));
1401                         /* continue parsing other params */
1402                         continue;
1403                 }
1404                 keylen = value - key;
1405                 value++;
1406
1407                 attr = NULL;
1408                 for (j = 0; typ->default_attrs[j]; j++) {
1409                         if (!strncmp(typ->default_attrs[j]->name, key,
1410                                      keylen)) {
1411                                 attr = typ->default_attrs[j];
1412                                 break;
1413                         }
1414                 }
1415
1416                 if (!attr) {
1417                         char *envp[3];
1418
1419                         envp[0] = kasprintf(GFP_KERNEL, "PARAM=%s.%s.%.*s",
1420                                             kobject_name(kobj->parent),
1421                                             kobject_name(kobj),
1422                                             (int) keylen, key);
1423                         envp[1] = kasprintf(GFP_KERNEL, "SETTING=%s", value);
1424                         envp[2] = NULL;
1425
1426                         if (kobject_uevent_env(kobj, KOBJ_CHANGE, envp)) {
1427                                 CERROR("%s: failed to send uevent %s\n",
1428                                        kobject_name(kobj), key);
1429                         }
1430
1431                         for (i = 0; i < ARRAY_SIZE(envp); i++)
1432                                 kfree(envp[i]);
1433                 } else {
1434                         count += lustre_attr_store(kobj, attr, value,
1435                                                    strlen(value));
1436                 }
1437         }
1438         return count;
1439 }
1440 EXPORT_SYMBOL(class_modify_config);
1441
1442 int class_process_proc_param(char *prefix, struct lprocfs_vars *lvars,
1443                              struct lustre_cfg *lcfg, void *data)
1444 {
1445         struct lprocfs_vars *var;
1446         struct file fakefile;
1447         struct seq_file fake_seqfile;
1448         char *key, *sval;
1449         int i, keylen, vallen;
1450         int matched = 0, j = 0;
1451         int rc = 0;
1452         int skip = 0;
1453         ENTRY;
1454
1455         if (lcfg->lcfg_command != LCFG_PARAM) {
1456                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1457                 RETURN(-EINVAL);
1458         }
1459
1460         /* fake a seq file so that var->fops->write can work... */
1461         fakefile.private_data = &fake_seqfile;
1462         fake_seqfile.private = data;
1463         /* e.g. tunefs.lustre --param mdt.group_upcall=foo /r/tmp/lustre-mdt
1464            or   lctl conf_param lustre-MDT0000.mdt.group_upcall=bar
1465            or   lctl conf_param lustre-OST0000.osc.max_dirty_mb=36 */
1466         for (i = 1; i < lcfg->lcfg_bufcount; i++) {
1467                 key = lustre_cfg_buf(lcfg, i);
1468                 /* Strip off prefix */
1469                 if (class_match_param(key, prefix, &key))
1470                         /* If the prefix doesn't match, return error so we
1471                          * can pass it down the stack */
1472                         RETURN(-ENOSYS);
1473                 sval = strchr(key, '=');
1474                 if (!sval || *(sval + 1) == 0) {
1475                         CERROR("%s: can't parse param '%s' (missing '=')\n",
1476                                lustre_cfg_string(lcfg, 0),
1477                                lustre_cfg_string(lcfg, i));
1478                         /* rc = -EINVAL;        continue parsing other params */
1479                         continue;
1480                 }
1481                 keylen = sval - key;
1482                 sval++;
1483                 vallen = strlen(sval);
1484                 matched = 0;
1485                 j = 0;
1486                 /* Search proc entries */
1487                 while (lvars[j].name) {
1488                         var = &lvars[j];
1489                         if (class_match_param(key, var->name, NULL) == 0 &&
1490                             keylen == strlen(var->name)) {
1491                                 matched++;
1492                                 rc = -EROFS;
1493
1494                                 if (var->fops && var->fops->write) {
1495                                         mm_segment_t oldfs;
1496                                         oldfs = get_fs();
1497                                         set_fs(KERNEL_DS);
1498                                         rc = (var->fops->write)(&fakefile, sval,
1499                                                                 vallen, NULL);
1500                                         set_fs(oldfs);
1501                                 }
1502                                 break;
1503                         }
1504                         j++;
1505                 }
1506                 if (!matched) {
1507                         /* It was upgraded from old MDT/OST device,
1508                          * ignore the obsolete "sec_level" parameter. */
1509                         if (strncmp("sec_level", key, keylen) == 0)
1510                                 continue;
1511
1512                         CERROR("%s: unknown config parameter '%s'\n",
1513                                lustre_cfg_string(lcfg, 0),
1514                                lustre_cfg_string(lcfg, i));
1515                         /* rc = -EINVAL;        continue parsing other params */
1516                         skip++;
1517                 } else if (rc < 0) {
1518                         CERROR("%s: error writing parameter '%s': rc = %d\n",
1519                                lustre_cfg_string(lcfg, 0), key, rc);
1520                         rc = 0;
1521                 } else {
1522                         CDEBUG(D_CONFIG, "%s: set parameter '%s'\n",
1523                                lustre_cfg_string(lcfg, 0), key);
1524                 }
1525         }
1526
1527         if (rc > 0)
1528                 rc = 0;
1529         if (!rc && skip)
1530                 rc = skip;
1531         RETURN(rc);
1532 }
1533 EXPORT_SYMBOL(class_process_proc_param);
1534
1535 /*
1536  * Supplemental functions for config logs, it allocates lustre_cfg
1537  * buffers plus initialized llog record header at the beginning.
1538  */
1539 struct llog_cfg_rec *lustre_cfg_rec_new(int cmd, struct lustre_cfg_bufs *bufs)
1540 {
1541         struct llog_cfg_rec     *lcr;
1542         int                      reclen;
1543
1544         ENTRY;
1545
1546         reclen = lustre_cfg_len(bufs->lcfg_bufcount, bufs->lcfg_buflen);
1547         reclen = llog_data_len(reclen) + sizeof(struct llog_rec_hdr) +
1548                  sizeof(struct llog_rec_tail);
1549
1550         OBD_ALLOC(lcr, reclen);
1551         if (lcr == NULL)
1552                 RETURN(NULL);
1553
1554         lustre_cfg_init(&lcr->lcr_cfg, cmd, bufs);
1555
1556         lcr->lcr_hdr.lrh_len = reclen;
1557         lcr->lcr_hdr.lrh_type = OBD_CFG_REC;
1558
1559         RETURN(lcr);
1560 }
1561 EXPORT_SYMBOL(lustre_cfg_rec_new);
1562
1563 void lustre_cfg_rec_free(struct llog_cfg_rec *lcr)
1564 {
1565         ENTRY;
1566         OBD_FREE(lcr, lcr->lcr_hdr.lrh_len);
1567         EXIT;
1568 }
1569 EXPORT_SYMBOL(lustre_cfg_rec_free);
1570
1571 /** Parse a configuration llog, doing various manipulations on them
1572  * for various reasons, (modifications for compatibility, skip obsolete
1573  * records, change uuids, etc), then class_process_config() resulting
1574  * net records.
1575  */
1576 int class_config_llog_handler(const struct lu_env *env,
1577                               struct llog_handle *handle,
1578                               struct llog_rec_hdr *rec, void *data)
1579 {
1580         struct config_llog_instance *cfg = data;
1581         int cfg_len = rec->lrh_len;
1582         char *cfg_buf = (char *) (rec + 1);
1583         int rc = 0;
1584         ENTRY;
1585
1586         /* class_config_dump_handler(handle, rec, data); */
1587
1588         switch (rec->lrh_type) {
1589         case OBD_CFG_REC: {
1590                 struct lustre_cfg *lcfg, *lcfg_new;
1591                 struct lustre_cfg_bufs bufs;
1592                 char *inst_name = NULL;
1593                 int inst_len = 0;
1594                 int swab = 0;
1595
1596                 lcfg = (struct lustre_cfg *)cfg_buf;
1597                 if (lcfg->lcfg_version == __swab32(LUSTRE_CFG_VERSION)) {
1598                         lustre_swab_lustre_cfg(lcfg);
1599                         swab = 1;
1600                 }
1601
1602                 rc = lustre_cfg_sanity_check(cfg_buf, cfg_len);
1603                 if (rc)
1604                         GOTO(out, rc);
1605
1606                 /* Figure out config state info */
1607                 if (lcfg->lcfg_command == LCFG_MARKER) {
1608                         struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
1609                         lustre_swab_cfg_marker(marker, swab,
1610                                                LUSTRE_CFG_BUFLEN(lcfg, 1));
1611                         CDEBUG(D_CONFIG, "Marker, inst_flg=%#x mark_flg=%#x\n",
1612                                cfg->cfg_flags, marker->cm_flags);
1613                         if (marker->cm_flags & CM_START) {
1614                                 /* all previous flags off */
1615                                 cfg->cfg_flags = CFG_F_MARKER;
1616                                 server_name2index(marker->cm_tgtname,
1617                                                   &cfg->cfg_lwp_idx, NULL);
1618                                 if (marker->cm_flags & CM_SKIP) {
1619                                         cfg->cfg_flags |= CFG_F_SKIP;
1620                                         CDEBUG(D_CONFIG, "SKIP #%d\n",
1621                                                marker->cm_step);
1622                                 } else if ((marker->cm_flags & CM_EXCLUDE) ||
1623                                            (cfg->cfg_sb &&
1624                                            lustre_check_exclusion(cfg->cfg_sb,
1625                                                         marker->cm_tgtname))) {
1626                                         cfg->cfg_flags |= CFG_F_EXCLUDE;
1627                                         CDEBUG(D_CONFIG, "EXCLUDE %d\n",
1628                                                marker->cm_step);
1629                                 }
1630                         } else if (marker->cm_flags & CM_END) {
1631                                 cfg->cfg_flags = 0;
1632                         }
1633                 }
1634                 /* A config command without a start marker before it is
1635                  * illegal
1636                  */
1637                 if (!(cfg->cfg_flags & CFG_F_MARKER) &&
1638                     (lcfg->lcfg_command != LCFG_MARKER)) {
1639                         CWARN("Config not inside markers, ignoring! "
1640                               "(inst: %p, uuid: %s, flags: %#x)\n",
1641                                 cfg->cfg_instance,
1642                                 cfg->cfg_uuid.uuid, cfg->cfg_flags);
1643                         cfg->cfg_flags |= CFG_F_SKIP;
1644                 }
1645                 if (cfg->cfg_flags & CFG_F_SKIP) {
1646                         CDEBUG(D_CONFIG, "skipping %#x\n",
1647                                cfg->cfg_flags);
1648                         rc = 0;
1649                         /* No processing! */
1650                         break;
1651                 }
1652
1653                 /*
1654                  * For interoperability between 1.8 and 2.0,
1655                  * rename "mds" obd device type to "mdt".
1656                  */
1657                 {
1658                         char *typename = lustre_cfg_string(lcfg, 1);
1659                         char *index = lustre_cfg_string(lcfg, 2);
1660
1661                         if ((lcfg->lcfg_command == LCFG_ATTACH && typename &&
1662                             strcmp(typename, "mds") == 0)) {
1663                                 CWARN("For 1.8 interoperability, rename obd "
1664                                         "type from mds to mdt\n");
1665                                 typename[2] = 't';
1666                         }
1667                         if ((lcfg->lcfg_command == LCFG_SETUP && index &&
1668                             strcmp(index, "type") == 0)) {
1669                                 CDEBUG(D_INFO, "For 1.8 interoperability, "
1670                                        "set this index to '0'\n");
1671                                 index[0] = '0';
1672                                 index[1] = 0;
1673                         }
1674                 }
1675
1676 #ifdef HAVE_SERVER_SUPPORT
1677                 /* newer MDS replaces LOV/OSC with LOD/OSP */
1678                 {
1679                         char *typename = lustre_cfg_string(lcfg, 1);
1680
1681                         if ((lcfg->lcfg_command == LCFG_ATTACH && typename &&
1682                             strcmp(typename, LUSTRE_LOV_NAME) == 0) &&
1683                             cfg->cfg_sb && IS_MDT(s2lsi(cfg->cfg_sb))) {
1684                                 CDEBUG(D_CONFIG,
1685                                        "For 2.x interoperability, rename obd "
1686                                        "type from lov to lod (%s)\n",
1687                                        s2lsi(cfg->cfg_sb)->lsi_svname);
1688                                 strcpy(typename, LUSTRE_LOD_NAME);
1689                         }
1690                         if ((lcfg->lcfg_command == LCFG_ATTACH && typename &&
1691                             strcmp(typename, LUSTRE_OSC_NAME) == 0) &&
1692                             cfg->cfg_sb && IS_MDT(s2lsi(cfg->cfg_sb))) {
1693                                 CDEBUG(D_CONFIG,
1694                                        "For 2.x interoperability, rename obd "
1695                                        "type from osc to osp (%s)\n",
1696                                        s2lsi(cfg->cfg_sb)->lsi_svname);
1697                                 strcpy(typename, LUSTRE_OSP_NAME);
1698                         }
1699                 }
1700 #endif /* HAVE_SERVER_SUPPORT */
1701
1702                 if (cfg->cfg_flags & CFG_F_EXCLUDE) {
1703                         CDEBUG(D_CONFIG, "cmd: %x marked EXCLUDED\n",
1704                                lcfg->lcfg_command);
1705                         if (lcfg->lcfg_command == LCFG_LOV_ADD_OBD)
1706                                 /* Add inactive instead */
1707                                 lcfg->lcfg_command = LCFG_LOV_ADD_INA;
1708                 }
1709
1710                 lustre_cfg_bufs_reset(&bufs, NULL);
1711                 lustre_cfg_bufs_init(&bufs, lcfg);
1712
1713                 if (cfg->cfg_instance &&
1714                     lcfg->lcfg_command != LCFG_SPTLRPC_CONF &&
1715                     LUSTRE_CFG_BUFLEN(lcfg, 0) > 0) {
1716                         inst_len = LUSTRE_CFG_BUFLEN(lcfg, 0) +
1717                                    sizeof(cfg->cfg_instance) * 2 + 4;
1718                         OBD_ALLOC(inst_name, inst_len);
1719                         if (inst_name == NULL)
1720                                 GOTO(out, rc = -ENOMEM);
1721                         snprintf(inst_name, inst_len, "%s-%p",
1722                                 lustre_cfg_string(lcfg, 0),
1723                                 cfg->cfg_instance);
1724                         lustre_cfg_bufs_set_string(&bufs, 0, inst_name);
1725                         CDEBUG(D_CONFIG, "cmd %x, instance name: %s\n",
1726                                lcfg->lcfg_command, inst_name);
1727                 }
1728
1729                 /* we override the llog's uuid for clients, to insure they
1730                 are unique */
1731                 if (cfg->cfg_instance != NULL &&
1732                     lcfg->lcfg_command == LCFG_ATTACH) {
1733                         lustre_cfg_bufs_set_string(&bufs, 2,
1734                                                    cfg->cfg_uuid.uuid);
1735                 }
1736                 /*
1737                  * sptlrpc config record, we expect 2 data segments:
1738                  *  [0]: fs_name/target_name,
1739                  *  [1]: rule string
1740                  * moving them to index [1] and [2], and insert MGC's
1741                  * obdname at index [0].
1742                  */
1743                 if (cfg->cfg_instance &&
1744                     lcfg->lcfg_command == LCFG_SPTLRPC_CONF) {
1745                         struct obd_device *obd = cfg->cfg_instance;
1746
1747                         lustre_cfg_bufs_set(&bufs, 2, bufs.lcfg_buf[1],
1748                                             bufs.lcfg_buflen[1]);
1749                         lustre_cfg_bufs_set(&bufs, 1, bufs.lcfg_buf[0],
1750                                             bufs.lcfg_buflen[0]);
1751                         lustre_cfg_bufs_set_string(&bufs, 0,
1752                                                    obd->obd_name);
1753                 }
1754
1755                 /* Add net info to setup command
1756                  * if given on command line.
1757                  * So config log will be:
1758                  * [0]: client name
1759                  * [1]: client UUID
1760                  * [2]: server UUID
1761                  * [3]: inactive-on-startup
1762                  * [4]: restrictive net
1763                  */
1764                 if (cfg && cfg->cfg_sb && s2lsi(cfg->cfg_sb) &&
1765                     !IS_SERVER(s2lsi(cfg->cfg_sb))) {
1766                         struct lustre_sb_info *lsi = s2lsi(cfg->cfg_sb);
1767                         char *nidnet = lsi->lsi_lmd->lmd_nidnet;
1768
1769                         if (lcfg->lcfg_command == LCFG_SETUP &&
1770                             lcfg->lcfg_bufcount != 2 && nidnet) {
1771                                 CDEBUG(D_CONFIG, "Adding net %s info to setup "
1772                                        "command for client %s\n", nidnet,
1773                                        lustre_cfg_string(lcfg, 0));
1774                                 lustre_cfg_bufs_set_string(&bufs, 4, nidnet);
1775                         }
1776                 }
1777
1778                 /* Skip add_conn command if uuid is
1779                  * not on restricted net */
1780                 if (cfg && cfg->cfg_sb && s2lsi(cfg->cfg_sb) &&
1781                     !IS_SERVER(s2lsi(cfg->cfg_sb))) {
1782                         struct lustre_sb_info *lsi = s2lsi(cfg->cfg_sb);
1783                         char *uuid_str = lustre_cfg_string(lcfg, 1);
1784
1785                         if (lcfg->lcfg_command == LCFG_ADD_CONN &&
1786                             lsi->lsi_lmd->lmd_nidnet &&
1787                             LNET_NIDNET(libcfs_str2nid(uuid_str)) !=
1788                             libcfs_str2net(lsi->lsi_lmd->lmd_nidnet)) {
1789                                 CDEBUG(D_CONFIG, "skipping add_conn for %s\n",
1790                                        uuid_str);
1791                                 rc = 0;
1792                                 /* No processing! */
1793                                 break;
1794                         }
1795                 }
1796
1797                 OBD_ALLOC(lcfg_new, lustre_cfg_len(bufs.lcfg_bufcount,
1798                                                    bufs.lcfg_buflen));
1799                 if (!lcfg_new)
1800                         GOTO(out, rc = -ENOMEM);
1801
1802                 lustre_cfg_init(lcfg_new, lcfg->lcfg_command, &bufs);
1803                 lcfg_new->lcfg_num   = lcfg->lcfg_num;
1804                 lcfg_new->lcfg_flags = lcfg->lcfg_flags;
1805
1806                 /* XXX Hack to try to remain binary compatible with
1807                  * pre-newconfig logs */
1808                 if (lcfg->lcfg_nal != 0 &&      /* pre-newconfig log? */
1809                     (lcfg->lcfg_nid >> 32) == 0) {
1810                         __u32 addr = (__u32)(lcfg->lcfg_nid & 0xffffffff);
1811
1812                         lcfg_new->lcfg_nid =
1813                                 LNET_MKNID(LNET_MKNET(lcfg->lcfg_nal, 0), addr);
1814                         CWARN("Converted pre-newconfig NAL %d NID %x to %s\n",
1815                               lcfg->lcfg_nal, addr,
1816                               libcfs_nid2str(lcfg_new->lcfg_nid));
1817                 } else {
1818                         lcfg_new->lcfg_nid = lcfg->lcfg_nid;
1819                 }
1820
1821                 lcfg_new->lcfg_nal = 0; /* illegal value for obsolete field */
1822
1823                 rc = class_process_config(lcfg_new);
1824                 OBD_FREE(lcfg_new, lustre_cfg_len(lcfg_new->lcfg_bufcount,
1825                                                   lcfg_new->lcfg_buflens));
1826                 if (inst_name)
1827                         OBD_FREE(inst_name, inst_len);
1828                 break;
1829         }
1830         default:
1831                 CERROR("Unknown llog record type %#x encountered\n",
1832                        rec->lrh_type);
1833                 break;
1834         }
1835 out:
1836         if (rc) {
1837                 CERROR("%s: cfg command failed: rc = %d\n",
1838                         handle->lgh_ctxt->loc_obd->obd_name, rc);
1839                 class_config_dump_handler(NULL, handle, rec, data);
1840         }
1841         RETURN(rc);
1842 }
1843 EXPORT_SYMBOL(class_config_llog_handler);
1844
1845 int class_config_parse_llog(const struct lu_env *env, struct llog_ctxt *ctxt,
1846                             char *name, struct config_llog_instance *cfg)
1847 {
1848         struct llog_process_cat_data cd = {
1849                 .lpcd_first_idx = 0,
1850         };
1851         struct llog_handle *llh;
1852         llog_cb_t callback;
1853         int rc;
1854         ENTRY;
1855
1856         CDEBUG(D_INFO, "looking up llog %s\n", name);
1857         rc = llog_open(env, ctxt, &llh, NULL, name, LLOG_OPEN_EXISTS);
1858         if (rc)
1859                 RETURN(rc);
1860
1861         rc = llog_init_handle(env, llh, LLOG_F_IS_PLAIN, NULL);
1862         if (rc)
1863                 GOTO(parse_out, rc);
1864
1865         /* continue processing from where we last stopped to end-of-log */
1866         if (cfg) {
1867                 cd.lpcd_first_idx = cfg->cfg_last_idx;
1868                 callback = cfg->cfg_callback;
1869                 LASSERT(callback != NULL);
1870         } else {
1871                 callback = class_config_llog_handler;
1872         }
1873
1874         cd.lpcd_last_idx = 0;
1875
1876         rc = llog_process(env, llh, callback, cfg, &cd);
1877
1878         CDEBUG(D_CONFIG, "Processed log %s gen %d-%d (rc=%d)\n", name,
1879                cd.lpcd_first_idx + 1, cd.lpcd_last_idx, rc);
1880         if (cfg)
1881                 cfg->cfg_last_idx = cd.lpcd_last_idx;
1882
1883 parse_out:
1884         llog_close(env, llh);
1885         RETURN(rc);
1886 }
1887 EXPORT_SYMBOL(class_config_parse_llog);
1888
1889 static struct lcfg_type_data {
1890         __u32    ltd_type;
1891         char    *ltd_name;
1892         char    *ltd_bufs[4];
1893 } lcfg_data_table[] = {
1894         { LCFG_ATTACH, "attach", { "type", "UUID", "3", "4" } },
1895         { LCFG_DETACH, "detach", { "1", "2", "3", "4" } },
1896         { LCFG_SETUP, "setup", { "UUID", "node", "options", "failout" } },
1897         { LCFG_CLEANUP, "cleanup", { "1", "2", "3", "4" } },
1898         { LCFG_ADD_UUID, "add_uuid", { "node", "2", "3", "4" }  },
1899         { LCFG_DEL_UUID, "del_uuid", { "1", "2", "3", "4" }  },
1900         { LCFG_MOUNTOPT, "new_profile", { "name", "lov", "lmv", "4" }  },
1901         { LCFG_DEL_MOUNTOPT, "del_mountopt", { "1", "2", "3", "4" } , },
1902         { LCFG_SET_TIMEOUT, "set_timeout", { "parameter", "2", "3", "4" }  },
1903         { LCFG_SET_UPCALL, "set_upcall", { "1", "2", "3", "4" }  },
1904         { LCFG_ADD_CONN, "add_conn", { "node", "2", "3", "4" }  },
1905         { LCFG_DEL_CONN, "del_conn", { "1", "2", "3", "4" }  },
1906         { LCFG_LOV_ADD_OBD, "add_osc", { "ost", "index", "gen", "UUID" } },
1907         { LCFG_LOV_DEL_OBD, "del_osc", { "1", "2", "3", "4" } },
1908         { LCFG_PARAM, "conf_param", { "parameter", "value", "3", "4" } },
1909         { LCFG_MARKER, "marker", { "1", "2", "3", "4" } },
1910         { LCFG_LOG_START, "log_start", { "1", "2", "3", "4" } },
1911         { LCFG_LOG_END, "log_end", { "1", "2", "3", "4" } },
1912         { LCFG_LOV_ADD_INA, "add_osc_inactive", { "1", "2", "3", "4" }  },
1913         { LCFG_ADD_MDC, "add_mdc", { "mdt", "index", "gen", "UUID" } },
1914         { LCFG_DEL_MDC, "del_mdc", { "1", "2", "3", "4" } },
1915         { LCFG_SPTLRPC_CONF, "security", { "parameter", "2", "3", "4" } },
1916         { LCFG_POOL_NEW, "new_pool", { "fsname", "pool", "3", "4" }  },
1917         { LCFG_POOL_ADD, "add_pool", { "fsname", "pool", "ost", "4" } },
1918         { LCFG_POOL_REM, "remove_pool", { "fsname", "pool", "ost", "4" } },
1919         { LCFG_POOL_DEL, "del_pool", { "fsname", "pool", "3", "4" } },
1920         { LCFG_SET_LDLM_TIMEOUT, "set_ldlm_timeout",
1921           { "parameter", "2", "3", "4" } },
1922         { LCFG_SET_PARAM, "set_param", { "parameter", "value", "3", "4" } },
1923         { 0, NULL, { NULL, NULL, NULL, NULL } }
1924 };
1925
1926 static struct lcfg_type_data *lcfg_cmd2data(__u32 cmd)
1927 {
1928         int i = 0;
1929
1930         while (lcfg_data_table[i].ltd_type != 0) {
1931                 if (lcfg_data_table[i].ltd_type == cmd)
1932                         return &lcfg_data_table[i];
1933                 i++;
1934         }
1935         return NULL;
1936 }
1937
1938 /**
1939  * Parse config record and output dump in supplied buffer.
1940  *
1941  * This is separated from class_config_dump_handler() to use
1942  * for ioctl needs as well
1943  *
1944  * Sample Output:
1945  * - { index: 4, event: attach, device: lustrewt-clilov, type: lov,
1946  *     UUID: lustrewt-clilov_UUID }
1947  */
1948 int class_config_yaml_output(struct llog_rec_hdr *rec, char *buf, int size)
1949 {
1950         struct lustre_cfg       *lcfg = (struct lustre_cfg *)(rec + 1);
1951         char                    *ptr = buf;
1952         char                    *end = buf + size;
1953         int                      rc = 0, i;
1954         struct lcfg_type_data   *ldata;
1955
1956         LASSERT(rec->lrh_type == OBD_CFG_REC);
1957         rc = lustre_cfg_sanity_check(lcfg, rec->lrh_len);
1958         if (rc < 0)
1959                 return rc;
1960
1961         ldata = lcfg_cmd2data(lcfg->lcfg_command);
1962         if (ldata == NULL)
1963                 return -ENOTTY;
1964
1965         if (lcfg->lcfg_command == LCFG_MARKER)
1966                 return 0;
1967
1968         /* form YAML entity */
1969         ptr += snprintf(ptr, end - ptr, "- { index: %u, event: %s",
1970                         rec->lrh_index, ldata->ltd_name);
1971
1972         if (lcfg->lcfg_flags)
1973                 ptr += snprintf(ptr, end - ptr, ", flags: %#08x",
1974                                 lcfg->lcfg_flags);
1975         if (lcfg->lcfg_num)
1976                 ptr += snprintf(ptr, end - ptr, ", num: %#08x",
1977                                 lcfg->lcfg_num);
1978         if (lcfg->lcfg_nid) {
1979                 char nidstr[LNET_NIDSTR_SIZE];
1980
1981                 libcfs_nid2str_r(lcfg->lcfg_nid, nidstr, sizeof(nidstr));
1982                 ptr += snprintf(ptr, end - ptr, ", nid: %s(%#llx)",
1983                                 nidstr, lcfg->lcfg_nid);
1984         }
1985
1986         if (LUSTRE_CFG_BUFLEN(lcfg, 0) > 0)
1987                 ptr += snprintf(ptr, end - ptr, ", device: %s",
1988                                 lustre_cfg_string(lcfg, 0));
1989
1990         if (lcfg->lcfg_command == LCFG_SET_PARAM) {
1991                 /*
1992                  * set_param -P parameters have param=val here, separate
1993                  * them through pointer magic and print them out in
1994                  * native yamlese
1995                  */
1996                 char *cfg_str = lustre_cfg_string(lcfg, 1);
1997                 char *tmp = strchr(cfg_str, '=');
1998                 size_t len;
1999
2000                 if (tmp == NULL)
2001                         return -ENOTTY;
2002
2003                 ptr += snprintf(ptr, end - ptr, ", %s: ", ldata->ltd_bufs[0]);
2004                 len = tmp - cfg_str + 1;
2005                 snprintf(ptr, len, "%s", cfg_str);
2006                 ptr += len - 1;
2007
2008                 ptr += snprintf(ptr, end - ptr, ", %s: ", ldata->ltd_bufs[1]);
2009                 ptr += snprintf(ptr, end - ptr, "%s", tmp + 1);
2010
2011                 goto out_done;
2012         }
2013
2014         for (i = 1; i < lcfg->lcfg_bufcount; i++) {
2015                 if (LUSTRE_CFG_BUFLEN(lcfg, i) > 0)
2016                         ptr += snprintf(ptr, end - ptr, ", %s: %s",
2017                                         ldata->ltd_bufs[i - 1],
2018                                         lustre_cfg_string(lcfg, i));
2019         }
2020
2021 out_done:
2022         ptr += snprintf(ptr, end - ptr, " }\n");
2023         /* return consumed bytes */
2024         rc = ptr - buf;
2025         return rc;
2026 }
2027
2028 /**
2029  * parse config record and output dump in supplied buffer.
2030  * This is separated from class_config_dump_handler() to use
2031  * for ioctl needs as well
2032  */
2033 static int class_config_parse_rec(struct llog_rec_hdr *rec, char *buf, int size)
2034 {
2035         struct lustre_cfg       *lcfg = (struct lustre_cfg *)(rec + 1);
2036         char                    *ptr = buf;
2037         char                    *end = buf + size;
2038         int                      rc = 0;
2039
2040         ENTRY;
2041
2042         LASSERT(rec->lrh_type == OBD_CFG_REC);
2043         rc = lustre_cfg_sanity_check(lcfg, rec->lrh_len);
2044         if (rc < 0)
2045                 RETURN(rc);
2046
2047         ptr += snprintf(ptr, end-ptr, "cmd=%05x ", lcfg->lcfg_command);
2048         if (lcfg->lcfg_flags)
2049                 ptr += snprintf(ptr, end-ptr, "flags=%#08x ",
2050                                 lcfg->lcfg_flags);
2051
2052         if (lcfg->lcfg_num)
2053                 ptr += snprintf(ptr, end-ptr, "num=%#08x ", lcfg->lcfg_num);
2054
2055         if (lcfg->lcfg_nid) {
2056                 char nidstr[LNET_NIDSTR_SIZE];
2057
2058                 libcfs_nid2str_r(lcfg->lcfg_nid, nidstr, sizeof(nidstr));
2059                 ptr += snprintf(ptr, end-ptr, "nid=%s(%#llx)\n     ",
2060                                 nidstr, lcfg->lcfg_nid);
2061         }
2062
2063         if (lcfg->lcfg_command == LCFG_MARKER) {
2064                 struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
2065
2066                 ptr += snprintf(ptr, end-ptr, "marker=%d(%#x)%s '%s'",
2067                                 marker->cm_step, marker->cm_flags,
2068                                 marker->cm_tgtname, marker->cm_comment);
2069         } else {
2070                 int i;
2071
2072                 for (i = 0; i <  lcfg->lcfg_bufcount; i++) {
2073                         ptr += snprintf(ptr, end-ptr, "%d:%s  ", i,
2074                                         lustre_cfg_string(lcfg, i));
2075                 }
2076         }
2077         ptr += snprintf(ptr, end - ptr, "\n");
2078         /* return consumed bytes */
2079         rc = ptr - buf;
2080         RETURN(rc);
2081 }
2082
2083 int class_config_dump_handler(const struct lu_env *env,
2084                               struct llog_handle *handle,
2085                               struct llog_rec_hdr *rec, void *data)
2086 {
2087         char    *outstr;
2088         int      rc = 0;
2089
2090         ENTRY;
2091
2092         OBD_ALLOC(outstr, 256);
2093         if (outstr == NULL)
2094                 RETURN(-ENOMEM);
2095
2096         if (rec->lrh_type == OBD_CFG_REC) {
2097                 class_config_parse_rec(rec, outstr, 256);
2098                 LCONSOLE(D_WARNING, "   %s\n", outstr);
2099         } else {
2100                 LCONSOLE(D_WARNING, "unhandled lrh_type: %#x\n", rec->lrh_type);
2101                 rc = -EINVAL;
2102         }
2103
2104         OBD_FREE(outstr, 256);
2105         RETURN(rc);
2106 }
2107
2108 /** Call class_cleanup and class_detach.
2109  * "Manual" only in the sense that we're faking lcfg commands.
2110  */
2111 int class_manual_cleanup(struct obd_device *obd)
2112 {
2113         char                    flags[3] = "";
2114         struct lustre_cfg      *lcfg;
2115         struct lustre_cfg_bufs  bufs;
2116         int                     rc;
2117         ENTRY;
2118
2119         if (!obd) {
2120                 CERROR("empty cleanup\n");
2121                 RETURN(-EALREADY);
2122         }
2123
2124         if (obd->obd_force)
2125                 strcat(flags, "F");
2126         if (obd->obd_fail)
2127                 strcat(flags, "A");
2128
2129         CDEBUG(D_CONFIG, "Manual cleanup of %s (flags='%s')\n",
2130                obd->obd_name, flags);
2131
2132         lustre_cfg_bufs_reset(&bufs, obd->obd_name);
2133         lustre_cfg_bufs_set_string(&bufs, 1, flags);
2134         OBD_ALLOC(lcfg, lustre_cfg_len(bufs.lcfg_bufcount, bufs.lcfg_buflen));
2135         if (!lcfg)
2136                 RETURN(-ENOMEM);
2137         lustre_cfg_init(lcfg, LCFG_CLEANUP, &bufs);
2138
2139         rc = class_process_config(lcfg);
2140         if (rc) {
2141                 CERROR("cleanup failed %d: %s\n", rc, obd->obd_name);
2142                 GOTO(out, rc);
2143         }
2144
2145         /* the lcfg is almost the same for both ops */
2146         lcfg->lcfg_command = LCFG_DETACH;
2147         rc = class_process_config(lcfg);
2148         if (rc)
2149                 CERROR("detach failed %d: %s\n", rc, obd->obd_name);
2150 out:
2151         OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens));
2152         RETURN(rc);
2153 }
2154 EXPORT_SYMBOL(class_manual_cleanup);
2155
2156 /*
2157  * uuid<->export lustre hash operations
2158  */
2159
2160 static unsigned
2161 uuid_hash(struct cfs_hash *hs, const void *key, unsigned mask)
2162 {
2163         return cfs_hash_djb2_hash(((struct obd_uuid *)key)->uuid,
2164                                   sizeof(((struct obd_uuid *)key)->uuid), mask);
2165 }
2166
2167 static void *
2168 uuid_key(struct hlist_node *hnode)
2169 {
2170         struct obd_export *exp;
2171
2172         exp = hlist_entry(hnode, struct obd_export, exp_uuid_hash);
2173
2174         return &exp->exp_client_uuid;
2175 }
2176
2177 /*
2178  * NOTE: It is impossible to find an export that is in failed
2179  *       state with this function
2180  */
2181 static int
2182 uuid_keycmp(const void *key, struct hlist_node *hnode)
2183 {
2184         struct obd_export *exp;
2185
2186         LASSERT(key);
2187         exp = hlist_entry(hnode, struct obd_export, exp_uuid_hash);
2188
2189         return obd_uuid_equals(key, &exp->exp_client_uuid) &&
2190                !exp->exp_failed;
2191 }
2192
2193 static void *
2194 uuid_export_object(struct hlist_node *hnode)
2195 {
2196         return hlist_entry(hnode, struct obd_export, exp_uuid_hash);
2197 }
2198
2199 static void
2200 uuid_export_get(struct cfs_hash *hs, struct hlist_node *hnode)
2201 {
2202         struct obd_export *exp;
2203
2204         exp = hlist_entry(hnode, struct obd_export, exp_uuid_hash);
2205         class_export_get(exp);
2206 }
2207
2208 static void
2209 uuid_export_put_locked(struct cfs_hash *hs, struct hlist_node *hnode)
2210 {
2211         struct obd_export *exp;
2212
2213         exp = hlist_entry(hnode, struct obd_export, exp_uuid_hash);
2214         class_export_put(exp);
2215 }
2216
2217 static struct cfs_hash_ops uuid_hash_ops = {
2218         .hs_hash        = uuid_hash,
2219         .hs_key         = uuid_key,
2220         .hs_keycmp      = uuid_keycmp,
2221         .hs_object      = uuid_export_object,
2222         .hs_get         = uuid_export_get,
2223         .hs_put_locked  = uuid_export_put_locked,
2224 };
2225
2226
2227 /*
2228  * nid<->export hash operations
2229  */
2230
2231 static unsigned
2232 nid_hash(struct cfs_hash *hs, const void *key, unsigned mask)
2233 {
2234         return cfs_hash_djb2_hash(key, sizeof(lnet_nid_t), mask);
2235 }
2236
2237 static void *
2238 nid_key(struct hlist_node *hnode)
2239 {
2240         struct obd_export *exp;
2241
2242         exp = hlist_entry(hnode, struct obd_export, exp_nid_hash);
2243
2244         RETURN(&exp->exp_connection->c_peer.nid);
2245 }
2246
2247 /*
2248  * NOTE: It is impossible to find an export that is in failed
2249  *       state with this function
2250  */
2251 static int
2252 nid_kepcmp(const void *key, struct hlist_node *hnode)
2253 {
2254         struct obd_export *exp;
2255
2256         LASSERT(key);
2257         exp = hlist_entry(hnode, struct obd_export, exp_nid_hash);
2258
2259         RETURN(exp->exp_connection->c_peer.nid == *(lnet_nid_t *)key &&
2260                !exp->exp_failed);
2261 }
2262
2263 static void *
2264 nid_export_object(struct hlist_node *hnode)
2265 {
2266         return hlist_entry(hnode, struct obd_export, exp_nid_hash);
2267 }
2268
2269 static void
2270 nid_export_get(struct cfs_hash *hs, struct hlist_node *hnode)
2271 {
2272         struct obd_export *exp;
2273
2274         exp = hlist_entry(hnode, struct obd_export, exp_nid_hash);
2275         class_export_get(exp);
2276 }
2277
2278 static void
2279 nid_export_put_locked(struct cfs_hash *hs, struct hlist_node *hnode)
2280 {
2281         struct obd_export *exp;
2282
2283         exp = hlist_entry(hnode, struct obd_export, exp_nid_hash);
2284         class_export_put(exp);
2285 }
2286
2287 static struct cfs_hash_ops nid_hash_ops = {
2288         .hs_hash        = nid_hash,
2289         .hs_key         = nid_key,
2290         .hs_keycmp      = nid_kepcmp,
2291         .hs_object      = nid_export_object,
2292         .hs_get         = nid_export_get,
2293         .hs_put_locked  = nid_export_put_locked,
2294 };
2295
2296
2297 /*
2298  * nid<->nidstats hash operations
2299  */
2300
2301 static void *
2302 nidstats_key(struct hlist_node *hnode)
2303 {
2304         struct nid_stat *ns;
2305
2306         ns = hlist_entry(hnode, struct nid_stat, nid_hash);
2307
2308         return &ns->nid;
2309 }
2310
2311 static int
2312 nidstats_keycmp(const void *key, struct hlist_node *hnode)
2313 {
2314         return *(lnet_nid_t *)nidstats_key(hnode) == *(lnet_nid_t *)key;
2315 }
2316
2317 static void *
2318 nidstats_object(struct hlist_node *hnode)
2319 {
2320         return hlist_entry(hnode, struct nid_stat, nid_hash);
2321 }
2322
2323 static void
2324 nidstats_get(struct cfs_hash *hs, struct hlist_node *hnode)
2325 {
2326         struct nid_stat *ns;
2327
2328         ns = hlist_entry(hnode, struct nid_stat, nid_hash);
2329         nidstat_getref(ns);
2330 }
2331
2332 static void
2333 nidstats_put_locked(struct cfs_hash *hs, struct hlist_node *hnode)
2334 {
2335         struct nid_stat *ns;
2336
2337         ns = hlist_entry(hnode, struct nid_stat, nid_hash);
2338         nidstat_putref(ns);
2339 }
2340
2341 static struct cfs_hash_ops nid_stat_hash_ops = {
2342         .hs_hash        = nid_hash,
2343         .hs_key         = nidstats_key,
2344         .hs_keycmp      = nidstats_keycmp,
2345         .hs_object      = nidstats_object,
2346         .hs_get         = nidstats_get,
2347         .hs_put_locked  = nidstats_put_locked,
2348 };
2349
2350
2351 /*
2352  * client_generation<->export hash operations
2353  */
2354
2355 static unsigned
2356 gen_hash(struct cfs_hash *hs, const void *key, unsigned mask)
2357 {
2358         return cfs_hash_djb2_hash(key, sizeof(__u32), mask);
2359 }
2360
2361 static void *
2362 gen_key(struct hlist_node *hnode)
2363 {
2364         struct obd_export *exp;
2365
2366         exp = hlist_entry(hnode, struct obd_export, exp_gen_hash);
2367
2368         RETURN(&exp->exp_target_data.ted_lcd->lcd_generation);
2369 }
2370
2371 /*
2372  * NOTE: It is impossible to find an export that is in failed
2373  *       state with this function
2374  */
2375 static int
2376 gen_kepcmp(const void *key, struct hlist_node *hnode)
2377 {
2378         struct obd_export *exp;
2379
2380         LASSERT(key);
2381         exp = hlist_entry(hnode, struct obd_export, exp_gen_hash);
2382
2383         RETURN(exp->exp_target_data.ted_lcd->lcd_generation == *(__u32 *)key &&
2384                !exp->exp_failed);
2385 }
2386
2387 static void *
2388 gen_export_object(struct hlist_node *hnode)
2389 {
2390         return hlist_entry(hnode, struct obd_export, exp_gen_hash);
2391 }
2392
2393 static void
2394 gen_export_get(struct cfs_hash *hs, struct hlist_node *hnode)
2395 {
2396         struct obd_export *exp;
2397
2398         exp = hlist_entry(hnode, struct obd_export, exp_gen_hash);
2399         class_export_get(exp);
2400 }
2401
2402 static void
2403 gen_export_put_locked(struct cfs_hash *hs, struct hlist_node *hnode)
2404 {
2405         struct obd_export *exp;
2406
2407         exp = hlist_entry(hnode, struct obd_export, exp_gen_hash);
2408         class_export_put(exp);
2409 }
2410
2411 static struct cfs_hash_ops gen_hash_ops = {
2412         .hs_hash        = gen_hash,
2413         .hs_key         = gen_key,
2414         .hs_keycmp      = gen_kepcmp,
2415         .hs_object      = gen_export_object,
2416         .hs_get         = gen_export_get,
2417         .hs_put_locked  = gen_export_put_locked,
2418 };