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LU-15406 sec: fix in-kernel fscrypt support
[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  *
31  * lustre/obdclass/obd_config.c
32  *
33  * Config API
34  */
35
36 #define DEBUG_SUBSYSTEM S_CLASS
37
38 #include <linux/kobject.h>
39 #include <linux/string.h>
40
41 #include <llog_swab.h>
42 #include <lprocfs_status.h>
43 #include <lustre_disk.h>
44 #include <uapi/linux/lustre/lustre_ioctl.h>
45 #include <lustre_log.h>
46 #include <uapi/linux/lustre/lustre_param.h>
47 #include <obd_class.h>
48
49 #include "llog_internal.h"
50
51 #ifdef HAVE_SERVER_SUPPORT
52 static struct cfs_hash_ops nid_stat_hash_ops;
53 static struct cfs_hash_ops gen_hash_ops;
54 #endif /* HAVE_SERVER_SUPPORT */
55
56 /*
57  * uuid<->export lustre hash operations
58  */
59 /*
60  * NOTE: It is impossible to find an export that is in failed
61  *      state with this function
62  */
63 static int
64 uuid_keycmp(struct rhashtable_compare_arg *arg, const void *obj)
65 {
66         const struct obd_uuid *uuid = arg->key;
67         const struct obd_export *exp = obj;
68
69         if (obd_uuid_equals(uuid, &exp->exp_client_uuid) &&
70             !exp->exp_failed)
71                 return 0;
72         return -ESRCH;
73 }
74
75 static void
76 obd_export_exit(void *vexport, void *data)
77 {
78         struct obd_export *exp = vexport;
79
80         class_export_put(exp);
81 }
82
83 static const struct rhashtable_params uuid_hash_params = {
84         .key_len        = sizeof(struct obd_uuid),
85         .key_offset     = offsetof(struct obd_export, exp_client_uuid),
86         .head_offset    = offsetof(struct obd_export, exp_uuid_hash),
87         .obj_cmpfn      = uuid_keycmp,
88         .max_size       = MAX_OBD_DEVICES,
89         .automatic_shrinking = true,
90 };
91
92 int obd_uuid_add(struct obd_device *obd, struct obd_export *export)
93 {
94         int rc;
95
96         class_export_get(export);
97         rcu_read_lock();
98         rc = rhashtable_lookup_insert_fast(&obd->obd_uuid_hash,
99                                            &export->exp_uuid_hash,
100                                            uuid_hash_params);
101         if (rc) {
102                 class_export_put(export);
103                 if (rc != -EEXIST) {
104                         /* map obscure error codes to -ENOMEM */
105                         rc = -ENOMEM;
106                 } else {
107                         rc = -EALREADY;
108                 }
109         }
110         rcu_read_unlock();
111
112         return rc;
113 }
114 EXPORT_SYMBOL(obd_uuid_add);
115
116 void obd_uuid_del(struct obd_device *obd, struct obd_export *export)
117 {
118         int rc;
119
120         rcu_read_lock();
121         rc = rhashtable_remove_fast(&obd->obd_uuid_hash,
122                                     &export->exp_uuid_hash,
123                                     uuid_hash_params);
124         if (!rc)
125                 class_export_put(export);
126         rcu_read_unlock();
127 }
128 EXPORT_SYMBOL(obd_uuid_del);
129
130 #ifdef HAVE_SERVER_SUPPORT
131 /* obd_uuid_lookup() is used only server side by target_handle_connect(),
132  * mdt_hsm_agent_send(), and obd_export_evict_by_uuid().
133  */
134 struct obd_export *obd_uuid_lookup(struct obd_device *obd,
135                                    struct obd_uuid *uuid)
136 {
137         struct obd_export *export = NULL;
138
139         rcu_read_lock();
140         export = rhashtable_lookup_fast(&obd->obd_uuid_hash, uuid,
141                                         uuid_hash_params);
142         if (export && !refcount_inc_not_zero(&export->exp_handle.h_ref))
143                 export = NULL;
144         rcu_read_unlock();
145
146         return export;
147 }
148 EXPORT_SYMBOL(obd_uuid_lookup);
149
150 /*
151  * nid<->export hash operations
152  */
153 static u32 nid_keyhash(const void *data, u32 key_len, u32 seed)
154 {
155         const struct obd_export *exp = data;
156         void *key;
157
158         if (!exp->exp_connection)
159                 return 0;
160
161         key = &exp->exp_connection->c_peer.nid;
162         return jhash2(key, key_len / sizeof(u32), seed);
163 }
164
165 /*
166  * NOTE: It is impossible to find an export that is in failed
167  *       state with this function
168  */
169 static int
170 nid_keycmp(struct rhashtable_compare_arg *arg, const void *obj)
171 {
172         const lnet_nid_t *nid = arg->key;
173         const struct obd_export *exp = obj;
174
175         if (exp->exp_connection->c_peer.nid == *nid)
176                 return 0;
177
178         return -ESRCH;
179 }
180
181 static void
182 nid_export_exit(void *vexport, void *data)
183 {
184         struct obd_export *exp = vexport;
185
186         class_export_put(exp);
187 }
188
189 static const struct rhashtable_params nid_hash_params = {
190         .key_len                = sizeof(lnet_nid_t),
191         .head_offset            = offsetof(struct obd_export, exp_nid_hash),
192         .obj_hashfn             = nid_keyhash,
193         .obj_cmpfn              = nid_keycmp,
194         .automatic_shrinking    = true,
195 };
196
197 int obd_nid_add(struct obd_device *obd, struct obd_export *exp)
198 {
199         int rc;
200
201         if (exp == exp->exp_obd->obd_self_export || exp->exp_hashed)
202                 return 0;
203
204         class_export_get(exp);
205         rc = rhltable_insert_key(&obd->obd_nid_hash,
206                                  &exp->exp_connection->c_peer.nid,
207                                  &exp->exp_nid_hash,
208                                  nid_hash_params);
209         if (rc) {
210                 class_export_put(exp);
211                 /* map obscure error codes to -ENOMEM */
212                 rc = -ENOMEM;
213         } else {
214                 exp->exp_hashed = 1;
215         }
216         return rc;
217 }
218 EXPORT_SYMBOL(obd_nid_add);
219
220 void obd_nid_del(struct obd_device *obd, struct obd_export *exp)
221 {
222         int rc;
223
224         if (exp == exp->exp_obd->obd_self_export || !exp->exp_hashed)
225                 return;
226
227         rc = rhltable_remove(&obd->obd_nid_hash, &exp->exp_nid_hash,
228                              nid_hash_params);
229         if (rc == 0) {
230                 class_export_put(exp);
231                 exp->exp_hashed = 0;
232         }
233 }
234 EXPORT_SYMBOL(obd_nid_del);
235
236 int obd_nid_export_for_each(struct obd_device *obd, lnet_nid_t nid,
237                             int cb(struct obd_export *exp, void *data),
238                             void *data)
239 {
240         struct rhlist_head *exports, *tmp;
241         struct obd_export *exp;
242         int ret = 0;
243
244         rcu_read_lock();
245         exports = rhltable_lookup(&obd->obd_nid_hash, &nid, nid_hash_params);
246         if (!exports) {
247                 ret = -ENODEV;
248                 goto out_unlock;
249         }
250
251         rhl_for_each_entry_rcu(exp, tmp, exports, exp_nid_hash) {
252                 if (!exp->exp_failed && cb(exp, data))
253                         ret++;
254         }
255
256 out_unlock:
257         rcu_read_unlock();
258         return ret;
259 }
260 EXPORT_SYMBOL(obd_nid_export_for_each);
261 #endif /* HAVE_SERVER_SUPPORT */
262
263 /*********** string parsing utils *********/
264
265 /* returns 0 if we find this key in the buffer, else 1 */
266 int class_find_param(char *buf, char *key, char **valp)
267 {
268         char *ptr;
269
270         if (!buf)
271                 return 1;
272
273         ptr = strstr(buf, key);
274         if (!ptr)
275                 return 1;
276
277         if (valp)
278                 *valp = ptr + strlen(key);
279
280         return 0;
281 }
282 EXPORT_SYMBOL(class_find_param);
283
284 /**
285  * Check whether the proc parameter \a param is an old parameter or not from
286  * the array \a ptr which contains the mapping from old parameters to new ones.
287  * If it's an old one, then return the pointer to the cfg_interop_param struc-
288  * ture which contains both the old and new parameters.
289  *
290  * \param param                 proc parameter
291  * \param ptr                   an array which contains the mapping from
292  *                              old parameters to new ones
293  *
294  * \retval valid-pointer        pointer to the cfg_interop_param structure
295  *                              which contains the old and new parameters
296  * \retval NULL                 \a param or \a ptr is NULL,
297  *                              or \a param is not an old parameter
298  */
299 struct cfg_interop_param *class_find_old_param(const char *param,
300                                                struct cfg_interop_param *ptr)
301 {
302         char *value = NULL;
303         int   name_len = 0;
304
305         if (!param || !ptr)
306                 RETURN(NULL);
307
308         value = strchr(param, '=');
309         if (value)
310                 name_len = value - param;
311         else
312                 name_len = strlen(param);
313
314         while (ptr->old_param) {
315                 if (strncmp(param, ptr->old_param, name_len) == 0 &&
316                     name_len == strlen(ptr->old_param))
317                         RETURN(ptr);
318                 ptr++;
319         }
320
321         RETURN(NULL);
322 }
323 EXPORT_SYMBOL(class_find_old_param);
324
325 /**
326  * Finds a parameter in \a params and copies it to \a copy.
327  *
328  * Leading spaces are skipped. Next space or end of string is the
329  * parameter terminator with the exception that spaces inside single or double
330  * quotes get included into a parameter. The parameter is copied into \a copy
331  * which has to be allocated big enough by a caller, quotes are stripped in
332  * the copy and the copy is terminated by 0.
333  *
334  * On return \a params is set to next parameter or to NULL if last
335  * parameter is returned.
336  *
337  * \retval 0 if parameter is returned in \a copy
338  * \retval 1 otherwise
339  * \retval -EINVAL if unbalanced quota is found
340  */
341 int class_get_next_param(char **params, char *copy)
342 {
343         char *q1, *q2, *str;
344         int len;
345
346         str = *params;
347         while (*str == ' ')
348                 str++;
349
350         if (*str == '\0') {
351                 *params = NULL;
352                 return 1;
353         }
354
355         while (1) {
356                 q1 = strpbrk(str, " '\"");
357                 if (!q1) {
358                         len = strlen(str);
359                         memcpy(copy, str, len);
360                         copy[len] = '\0';
361                         *params = NULL;
362                         return 0;
363                 }
364                 len = q1 - str;
365                 if (*q1 == ' ') {
366                         memcpy(copy, str, len);
367                         copy[len] = '\0';
368                         *params = str + len;
369                         return 0;
370                 }
371
372                 memcpy(copy, str, len);
373                 copy += len;
374
375                 /* search for the matching closing quote */
376                 str = q1 + 1;
377                 q2 = strchr(str, *q1);
378                 if (!q2) {
379                         CERROR("Unbalanced quota in parameters: \"%s\"\n",
380                                *params);
381                         return -EINVAL;
382                 }
383                 len = q2 - str;
384                 memcpy(copy, str, len);
385                 copy += len;
386                 str = q2 + 1;
387         }
388         return 1;
389 }
390 EXPORT_SYMBOL(class_get_next_param);
391
392 /*
393  * returns 0 if this is the first key in the buffer, else 1.
394  * valp points to first char after key.
395  */
396 int class_match_param(char *buf, const char *key, char **valp)
397 {
398         if (!buf)
399                 return 1;
400
401         if (memcmp(buf, key, strlen(key)) != 0)
402                 return 1;
403
404         if (valp)
405                 *valp = buf + strlen(key);
406
407         return 0;
408 }
409 EXPORT_SYMBOL(class_match_param);
410
411 static int parse_nid(char *buf, void *value, int quiet)
412 {
413         lnet_nid_t *nid = (lnet_nid_t *)value;
414
415         *nid = libcfs_str2nid(buf);
416         if (*nid != LNET_NID_ANY)
417                 return 0;
418
419         if (!quiet)
420                 LCONSOLE_ERROR_MSG(0x159, "Can't parse NID '%s'\n", buf);
421         return -EINVAL;
422 }
423
424 static int parse_net(char *buf, void *value)
425 {
426         __u32 *net = (__u32 *)value;
427
428         *net = libcfs_str2net(buf);
429         CDEBUG(D_INFO, "Net %s\n", libcfs_net2str(*net));
430         return 0;
431 }
432
433 enum {
434         CLASS_PARSE_NID = 1,
435         CLASS_PARSE_NET,
436 };
437
438 /*
439  * 0 is good NID,
440  * 1 not found
441  * < 0 error
442  * endh is set to next separator
443  */
444 static int class_parse_value(char *buf, int opc, void *value, char **endh,
445                              int quiet)
446 {
447         char *endp;
448         char  tmp;
449         int   rc = 0;
450
451         if (!buf)
452                 return 1;
453         while (*buf == ',' || *buf == ':')
454                 buf++;
455         if (*buf == ' ' || *buf == '/' || *buf == '\0')
456                 return 1;
457
458         /* NID separators or end of NIDs */
459         endp = strpbrk(buf, ",: /");
460         if (!endp)
461                 endp = buf + strlen(buf);
462
463         tmp = *endp;
464         *endp = '\0';
465         switch (opc) {
466         default:
467                 LBUG();
468         case CLASS_PARSE_NID:
469                 rc = parse_nid(buf, value, quiet);
470                 break;
471         case CLASS_PARSE_NET:
472                 rc = parse_net(buf, value);
473                 break;
474         }
475         *endp = tmp;
476         if (rc != 0)
477                 return rc;
478         if (endh)
479                 *endh = endp;
480         return 0;
481 }
482
483 int class_parse_nid(char *buf, lnet_nid_t *nid, char **endh)
484 {
485         return class_parse_value(buf, CLASS_PARSE_NID, (void *)nid, endh, 0);
486 }
487 EXPORT_SYMBOL(class_parse_nid);
488
489 int class_parse_nid_quiet(char *buf, lnet_nid_t *nid, char **endh)
490 {
491         return class_parse_value(buf, CLASS_PARSE_NID, (void *)nid, endh, 1);
492 }
493 EXPORT_SYMBOL(class_parse_nid_quiet);
494
495 int class_parse_net(char *buf, __u32 *net, char **endh)
496 {
497         return class_parse_value(buf, CLASS_PARSE_NET, (void *)net, endh, 0);
498 }
499
500 /*
501  * 1 param contains key and match
502  * 0 param contains key and not match
503  * -1 param does not contain key
504  */
505 int class_match_nid(char *buf, char *key, lnet_nid_t nid)
506 {
507         lnet_nid_t tmp;
508         int rc = -1;
509
510         while (class_find_param(buf, key, &buf) == 0) {
511                 /*
512                  * please restrict to the NIDs pertaining to
513                  * the specified NIDs
514                  */
515                 while (class_parse_nid(buf, &tmp, &buf) == 0) {
516                         if (tmp == nid)
517                                 return 1;
518                 }
519                 rc = 0;
520         }
521         return rc;
522 }
523
524 int class_match_net(char *buf, char *key, __u32 net)
525 {
526         __u32 tmp;
527         int rc = -1;
528
529         while (class_find_param(buf, key, &buf) == 0) {
530                 /*
531                  * please restrict to the NIDs pertaining to
532                  * the specified networks
533                  */
534                 while (class_parse_net(buf, &tmp, &buf) == 0) {
535                         if (tmp == net)
536                                 return 1;
537                 }
538                 rc = 0;
539         }
540         return rc;
541 }
542
543 char *lustre_cfg_string(struct lustre_cfg *lcfg, u32 index)
544 {
545         char *s;
546
547         if (!lcfg->lcfg_buflens[index])
548                 return NULL;
549
550         s = lustre_cfg_buf(lcfg, index);
551         if (!s)
552                 return NULL;
553
554         /*
555          * make sure it's NULL terminated, even if this kills a char
556          * of data.  Try to use the padding first though.
557          */
558         if (s[lcfg->lcfg_buflens[index] - 1] != '\0') {
559                 size_t last = ALIGN(lcfg->lcfg_buflens[index], 8) - 1;
560                 char lost;
561
562                 /* Use the smaller value */
563                 if (last > lcfg->lcfg_buflens[index])
564                         last = lcfg->lcfg_buflens[index];
565
566                 lost = s[last];
567                 s[last] = '\0';
568                 if (lost != '\0') {
569                         CWARN("Truncated buf %d to '%s' (lost '%c'...)\n",
570                               index, s, lost);
571                 }
572         }
573         return s;
574 }
575 EXPORT_SYMBOL(lustre_cfg_string);
576
577 /********************** class fns **********************/
578
579 /**
580  * Create a new OBD device and set the type, name and uuid.  If successful,
581  * the new device can be accessed by either name or uuid.
582  */
583 int class_attach(struct lustre_cfg *lcfg)
584 {
585         struct obd_export *exp;
586         struct obd_device *obd = NULL;
587         char *typename, *name, *uuid;
588         int rc, len;
589
590         ENTRY;
591
592         if (!LUSTRE_CFG_BUFLEN(lcfg, 1)) {
593                 CERROR("No type passed!\n");
594                 RETURN(-EINVAL);
595         }
596         typename = lustre_cfg_string(lcfg, 1);
597
598         if (!LUSTRE_CFG_BUFLEN(lcfg, 0)) {
599                 CERROR("No name passed!\n");
600                 RETURN(-EINVAL);
601         }
602         name = lustre_cfg_string(lcfg, 0);
603         if (!LUSTRE_CFG_BUFLEN(lcfg, 2)) {
604                 CERROR("No UUID passed!\n");
605                 RETURN(-EINVAL);
606         }
607
608         uuid = lustre_cfg_string(lcfg, 2);
609         len = strlen(uuid);
610         if (len >= sizeof(obd->obd_uuid)) {
611                 CERROR("%s: uuid must be < %d bytes long\n",
612                        name, (int)sizeof(obd->obd_uuid));
613                 RETURN(-EINVAL);
614         }
615
616         obd = class_newdev(typename, name, uuid);
617         if (IS_ERR(obd)) { /* Already exists or out of obds */
618                 rc = PTR_ERR(obd);
619                 CERROR("Cannot create device %s of type %s : %d\n",
620                        name, typename, rc);
621                 RETURN(rc);
622         }
623         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
624                  "obd %p obd_magic %08X != %08X\n",
625                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
626         LASSERTF(strncmp(obd->obd_name, name, strlen(name)) == 0,
627                  "%p obd_name %s != %s\n", obd, obd->obd_name, name);
628
629         exp = class_new_export_self(obd, &obd->obd_uuid);
630         if (IS_ERR(exp)) {
631                 rc = PTR_ERR(exp);
632                 class_free_dev(obd);
633                 RETURN(rc);
634         }
635
636         obd->obd_self_export = exp;
637         list_del_init(&exp->exp_obd_chain_timed);
638         class_export_put(exp);
639
640         rc = class_register_device(obd);
641         if (rc != 0) {
642                 class_decref(obd, "newdev", obd);
643                 RETURN(rc);
644         }
645
646         obd->obd_attached = 1;
647         CDEBUG(D_IOCTL, "OBD: dev %d attached type %s with refcount %d\n",
648                obd->obd_minor, typename, atomic_read(&obd->obd_refcount));
649
650         RETURN(0);
651 }
652 EXPORT_SYMBOL(class_attach);
653
654 /**
655  * Create hashes, self-export, and call type-specific setup.
656  * Setup is effectively the "start this obd" call.
657  */
658 int class_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
659 {
660         int err = 0;
661
662         ENTRY;
663
664         LASSERT(obd != NULL);
665         LASSERTF(obd == class_num2obd(obd->obd_minor),
666                  "obd %p != obd_devs[%d] %p\n",
667                  obd, obd->obd_minor, class_num2obd(obd->obd_minor));
668         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
669                  "obd %p obd_magic %08x != %08x\n",
670                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
671
672         /* have we attached a type to this device? */
673         if (!obd->obd_attached) {
674                 CERROR("Device %d not attached\n", obd->obd_minor);
675                 RETURN(-ENODEV);
676         }
677
678         if (obd->obd_set_up) {
679                 CERROR("Device %d already setup (type %s)\n",
680                        obd->obd_minor, obd->obd_type->typ_name);
681                 RETURN(-EEXIST);
682         }
683
684         /* is someone else setting us up right now? (attach inits spinlock) */
685         spin_lock(&obd->obd_dev_lock);
686         if (obd->obd_starting) {
687                 spin_unlock(&obd->obd_dev_lock);
688                 CERROR("Device %d setup in progress (type %s)\n",
689                        obd->obd_minor, obd->obd_type->typ_name);
690                 RETURN(-EEXIST);
691         }
692         /*
693          * just leave this on forever.  I can't use obd_set_up here because
694          * other fns check that status, and we're not actually set up yet.
695          */
696         obd->obd_starting = 1;
697         obd->obd_nid_stats_hash = NULL;
698         obd->obd_gen_hash = NULL;
699         spin_unlock(&obd->obd_dev_lock);
700
701         /* create an uuid-export lustre hash */
702         err = rhashtable_init(&obd->obd_uuid_hash, &uuid_hash_params);
703         if (err)
704                 GOTO(err_starting, err);
705
706 #ifdef HAVE_SERVER_SUPPORT
707         /* create a nid-export lustre hash */
708         err = rhltable_init(&obd->obd_nid_hash, &nid_hash_params);
709         if (err)
710                 GOTO(err_uuid_hash, err = -ENOMEM);
711
712         /* create a nid-stats lustre hash */
713         obd->obd_nid_stats_hash = cfs_hash_create("NID_STATS",
714                                                   HASH_NID_STATS_CUR_BITS,
715                                                   HASH_NID_STATS_MAX_BITS,
716                                                   HASH_NID_STATS_BKT_BITS, 0,
717                                                   CFS_HASH_MIN_THETA,
718                                                   CFS_HASH_MAX_THETA,
719                                                   &nid_stat_hash_ops,
720                                                   CFS_HASH_DEFAULT);
721         if (!obd->obd_nid_stats_hash)
722                 GOTO(err_nid_hash, err = -ENOMEM);
723
724         /* create a client_generation-export lustre hash */
725         obd->obd_gen_hash = cfs_hash_create("UUID_HASH",
726                                             HASH_GEN_CUR_BITS,
727                                             HASH_GEN_MAX_BITS,
728                                             HASH_GEN_BKT_BITS, 0,
729                                             CFS_HASH_MIN_THETA,
730                                             CFS_HASH_MAX_THETA,
731                                             &gen_hash_ops, CFS_HASH_DEFAULT);
732         if (!obd->obd_gen_hash)
733                 GOTO(err_nid_stats_hash, err = -ENOMEM);
734 #endif /* HAVE_SERVER_SUPPORT */
735
736         err = obd_setup(obd, lcfg);
737         if (err)
738 #ifdef HAVE_SERVER_SUPPORT
739                 GOTO(err_gen_hash, err);
740 #else
741                 GOTO(err_uuid_hash, err);
742 #endif /* ! HAVE_SERVER_SUPPORT */
743
744         obd->obd_set_up = 1;
745
746         spin_lock(&obd->obd_dev_lock);
747         /* cleanup drops this */
748         class_incref(obd, "setup", obd);
749         spin_unlock(&obd->obd_dev_lock);
750
751         CDEBUG(D_IOCTL, "finished setup of obd %s (uuid %s)\n",
752                obd->obd_name, obd->obd_uuid.uuid);
753
754         RETURN(0);
755
756 #ifdef HAVE_SERVER_SUPPORT
757 err_gen_hash:
758         if (obd->obd_gen_hash) {
759                 cfs_hash_putref(obd->obd_gen_hash);
760                 obd->obd_gen_hash = NULL;
761         }
762 err_nid_stats_hash:
763         if (obd->obd_nid_stats_hash) {
764                 cfs_hash_putref(obd->obd_nid_stats_hash);
765                 obd->obd_nid_stats_hash = NULL;
766         }
767 err_nid_hash:
768         rhltable_destroy(&obd->obd_nid_hash);
769 #endif /* HAVE_SERVER_SUPPORT */
770 err_uuid_hash:
771         rhashtable_destroy(&obd->obd_uuid_hash);
772 err_starting:
773         obd->obd_starting = 0;
774         CERROR("setup %s failed (%d)\n", obd->obd_name, err);
775         return err;
776 }
777 EXPORT_SYMBOL(class_setup);
778
779 /**
780  * We have finished using this OBD and are ready to destroy it.
781  * There can be no more references to this obd.
782  */
783 int class_detach(struct obd_device *obd, struct lustre_cfg *lcfg)
784 {
785         ENTRY;
786
787         if (obd->obd_set_up) {
788                 CERROR("OBD device %d still set up\n", obd->obd_minor);
789                 RETURN(-EBUSY);
790         }
791
792         spin_lock(&obd->obd_dev_lock);
793         if (!obd->obd_attached) {
794                 spin_unlock(&obd->obd_dev_lock);
795                 CERROR("OBD device %d not attached\n", obd->obd_minor);
796                 RETURN(-ENODEV);
797         }
798         obd->obd_attached = 0;
799         spin_unlock(&obd->obd_dev_lock);
800
801         /* cleanup in progress. we don't like to find this device after now */
802         class_unregister_device(obd);
803
804         CDEBUG(D_IOCTL, "detach on obd %s (uuid %s)\n",
805                obd->obd_name, obd->obd_uuid.uuid);
806
807         class_decref(obd, "newdev", obd);
808
809         RETURN(0);
810 }
811 EXPORT_SYMBOL(class_detach);
812
813 /**
814  * Start shutting down the OBD.  There may be in-progess ops when
815  * this is called.  We tell them to start shutting down with a call
816  * to class_disconnect_exports().
817  */
818 int class_cleanup(struct obd_device *obd, struct lustre_cfg *lcfg)
819 {
820         int err = 0;
821         char *flag;
822         ENTRY;
823
824         OBD_RACE(OBD_FAIL_LDLM_RECOV_CLIENTS);
825
826         if (!obd->obd_set_up) {
827                 CERROR("Device %d not setup\n", obd->obd_minor);
828                 RETURN(-ENODEV);
829         }
830
831         spin_lock(&obd->obd_dev_lock);
832         if (obd->obd_stopping) {
833                 spin_unlock(&obd->obd_dev_lock);
834                 CERROR("OBD %d already stopping\n", obd->obd_minor);
835                 RETURN(-ENODEV);
836         }
837         /* Leave this on forever */
838         obd->obd_stopping = 1;
839         spin_unlock(&obd->obd_dev_lock);
840
841         /* wait for already-arrived-connections to finish. */
842         while (obd->obd_conn_inprogress > 0)
843                 yield();
844         smp_rmb();
845
846         if (lcfg->lcfg_bufcount >= 2 && LUSTRE_CFG_BUFLEN(lcfg, 1) > 0) {
847                 for (flag = lustre_cfg_string(lcfg, 1); *flag != 0; flag++)
848                         switch (*flag) {
849                         case 'F':
850                                 obd->obd_force = 1;
851                                 break;
852                         case 'A':
853                                 LCONSOLE_WARN("Failing over %s\n",
854                                               obd->obd_name);
855                                 spin_lock(&obd->obd_dev_lock);
856                                 obd->obd_fail = 1;
857 #ifdef HAVE_SERVER_SUPPORT
858                                 obd->obd_no_transno = 1;
859 #endif
860                                 obd->obd_no_recov = 1;
861                                 spin_unlock(&obd->obd_dev_lock);
862                                 if (OBP(obd, iocontrol)) {
863                                         obd_iocontrol(OBD_IOC_SYNC,
864                                                       obd->obd_self_export,
865                                                       0, NULL, NULL);
866                                 }
867                                 break;
868                         default:
869                                 CERROR("Unrecognised flag '%c'\n", *flag);
870                         }
871         }
872
873         LASSERT(obd->obd_self_export);
874
875         CDEBUG(D_IOCTL, "%s: forcing exports to disconnect: %d/%d\n",
876                obd->obd_name, obd->obd_num_exports,
877                atomic_read(&obd->obd_refcount) - 2);
878         dump_exports(obd, 0, D_HA);
879         class_disconnect_exports(obd);
880
881         /* Precleanup, we must make sure all exports get destroyed. */
882         err = obd_precleanup(obd);
883         if (err)
884                 CERROR("Precleanup %s returned %d\n",
885                        obd->obd_name, err);
886
887         /* destroy an uuid-export hash body */
888         rhashtable_free_and_destroy(&obd->obd_uuid_hash, obd_export_exit,
889                                     NULL);
890 #ifdef HAVE_SERVER_SUPPORT
891         /* destroy a nid-export hash body */
892         rhltable_free_and_destroy(&obd->obd_nid_hash, nid_export_exit, NULL);
893
894         /* destroy a nid-stats hash body */
895         if (obd->obd_nid_stats_hash) {
896                 cfs_hash_putref(obd->obd_nid_stats_hash);
897                 obd->obd_nid_stats_hash = NULL;
898         }
899
900         /* destroy a client_generation-export hash body */
901         if (obd->obd_gen_hash) {
902                 cfs_hash_putref(obd->obd_gen_hash);
903                 obd->obd_gen_hash = NULL;
904         }
905 #endif /* HAVE_SERVER_SUPPORT */
906         class_decref(obd, "setup", obd);
907         obd->obd_set_up = 0;
908
909         RETURN(0);
910 }
911
912 struct obd_device *class_incref(struct obd_device *obd,
913                                 const char *scope,
914                                 const void *source)
915 {
916         lu_ref_add_atomic(&obd->obd_reference, scope, source);
917         atomic_inc(&obd->obd_refcount);
918         CDEBUG(D_INFO, "incref %s (%p) now %d - %s\n", obd->obd_name, obd,
919                atomic_read(&obd->obd_refcount), scope);
920
921         return obd;
922 }
923 EXPORT_SYMBOL(class_incref);
924
925 void class_decref(struct obd_device *obd, const char *scope, const void *source)
926 {
927         int last;
928
929         CDEBUG(D_INFO, "Decref %s (%p) now %d - %s\n", obd->obd_name, obd,
930                atomic_read(&obd->obd_refcount), scope);
931
932         LASSERT(obd->obd_num_exports >= 0);
933         last = atomic_dec_and_test(&obd->obd_refcount);
934         lu_ref_del(&obd->obd_reference, scope, source);
935
936         if (last) {
937                 struct obd_export *exp;
938
939                 LASSERT(!obd->obd_attached);
940                 /*
941                  * All exports have been destroyed; there should
942                  * be no more in-progress ops by this point.
943                  */
944                 exp = obd->obd_self_export;
945
946                 if (exp) {
947                         exp->exp_flags |= exp_flags_from_obd(obd);
948                         class_unlink_export(exp);
949                 }
950         }
951 }
952 EXPORT_SYMBOL(class_decref);
953
954 /**
955  * Add a failover NID location.
956  * Client OBD types contact server OBD types using this NID list.
957  */
958 int class_add_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
959 {
960         struct obd_import *imp;
961         struct obd_uuid uuid;
962         int rc;
963
964         ENTRY;
965
966         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
967             LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(struct obd_uuid)) {
968                 CERROR("invalid conn_uuid\n");
969                 RETURN(-EINVAL);
970         }
971         if (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) &&
972             strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME) &&
973             strcmp(obd->obd_type->typ_name, LUSTRE_OSP_NAME) &&
974             strcmp(obd->obd_type->typ_name, LUSTRE_LWP_NAME) &&
975             strcmp(obd->obd_type->typ_name, LUSTRE_MGC_NAME)) {
976                 CERROR("can't add connection on non-client dev\n");
977                 RETURN(-EINVAL);
978         }
979
980         imp = obd->u.cli.cl_import;
981         if (!imp) {
982                 CERROR("try to add conn on immature client dev\n");
983                 RETURN(-EINVAL);
984         }
985
986         obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
987         rc = obd_add_conn(imp, &uuid, lcfg->lcfg_num);
988
989         RETURN(rc);
990 }
991
992 /** Remove a failover NID location. */
993 static int class_del_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
994 {
995         struct obd_import *imp;
996         struct obd_uuid uuid;
997         int rc;
998
999         ENTRY;
1000
1001         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
1002             LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(struct obd_uuid)) {
1003                 CERROR("invalid conn_uuid\n");
1004                 RETURN(-EINVAL);
1005         }
1006         if (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) &&
1007             strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME)) {
1008                 CERROR("can't del connection on non-client dev\n");
1009                 RETURN(-EINVAL);
1010         }
1011
1012         imp = obd->u.cli.cl_import;
1013         if (!imp) {
1014                 CERROR("try to del conn on immature client dev\n");
1015                 RETURN(-EINVAL);
1016         }
1017
1018         obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
1019         rc = obd_del_conn(imp, &uuid);
1020
1021         RETURN(rc);
1022 }
1023
1024 static LIST_HEAD(lustre_profile_list);
1025 static DEFINE_SPINLOCK(lustre_profile_list_lock);
1026
1027 struct lustre_profile *class_get_profile(const char *prof)
1028 {
1029         struct lustre_profile *lprof;
1030
1031         ENTRY;
1032         spin_lock(&lustre_profile_list_lock);
1033         list_for_each_entry(lprof, &lustre_profile_list, lp_list) {
1034                 if (!strcmp(lprof->lp_profile, prof)) {
1035                         lprof->lp_refs++;
1036                         spin_unlock(&lustre_profile_list_lock);
1037                         RETURN(lprof);
1038                 }
1039         }
1040         spin_unlock(&lustre_profile_list_lock);
1041         RETURN(NULL);
1042 }
1043 EXPORT_SYMBOL(class_get_profile);
1044
1045 /**
1046  * Create a named "profile".
1047  * This defines the MDC and OSC names to use for a client.
1048  * This also is used to define the LOV to be used by a MDT.
1049  */
1050 static int class_add_profile(int proflen, char *prof, int osclen, char *osc,
1051                              int mdclen, char *mdc)
1052 {
1053         struct lustre_profile *lprof;
1054         int err = 0;
1055
1056         ENTRY;
1057
1058         CDEBUG(D_CONFIG, "Add profile %s\n", prof);
1059
1060         OBD_ALLOC(lprof, sizeof(*lprof));
1061         if (!lprof)
1062                 RETURN(-ENOMEM);
1063         INIT_LIST_HEAD(&lprof->lp_list);
1064
1065         LASSERT(proflen == (strlen(prof) + 1));
1066         OBD_ALLOC(lprof->lp_profile, proflen);
1067         if (!lprof->lp_profile)
1068                 GOTO(out, err = -ENOMEM);
1069         memcpy(lprof->lp_profile, prof, proflen);
1070
1071         LASSERT(osclen == (strlen(osc) + 1));
1072         OBD_ALLOC(lprof->lp_dt, osclen);
1073         if (!lprof->lp_dt)
1074                 GOTO(out, err = -ENOMEM);
1075         memcpy(lprof->lp_dt, osc, osclen);
1076
1077         if (mdclen > 0) {
1078                 LASSERT(mdclen == (strlen(mdc) + 1));
1079                 OBD_ALLOC(lprof->lp_md, mdclen);
1080                 if (!lprof->lp_md)
1081                         GOTO(out, err = -ENOMEM);
1082                 memcpy(lprof->lp_md, mdc, mdclen);
1083         }
1084
1085         spin_lock(&lustre_profile_list_lock);
1086         lprof->lp_refs = 1;
1087         lprof->lp_list_deleted = false;
1088
1089         list_add(&lprof->lp_list, &lustre_profile_list);
1090         spin_unlock(&lustre_profile_list_lock);
1091         RETURN(err);
1092
1093 out:
1094         if (lprof->lp_md)
1095                 OBD_FREE(lprof->lp_md, mdclen);
1096         if (lprof->lp_dt)
1097                 OBD_FREE(lprof->lp_dt, osclen);
1098         if (lprof->lp_profile)
1099                 OBD_FREE(lprof->lp_profile, proflen);
1100         OBD_FREE(lprof, sizeof(*lprof));
1101         RETURN(err);
1102 }
1103
1104 void class_del_profile(const char *prof)
1105 {
1106         struct lustre_profile *lprof;
1107
1108         ENTRY;
1109
1110         CDEBUG(D_CONFIG, "Del profile %s\n", prof);
1111
1112         lprof = class_get_profile(prof);
1113         if (lprof) {
1114                 spin_lock(&lustre_profile_list_lock);
1115                 /* because get profile increments the ref counter */
1116                 lprof->lp_refs--;
1117                 list_del(&lprof->lp_list);
1118                 lprof->lp_list_deleted = true;
1119                 spin_unlock(&lustre_profile_list_lock);
1120
1121                 class_put_profile(lprof);
1122         }
1123         EXIT;
1124 }
1125 EXPORT_SYMBOL(class_del_profile);
1126
1127 void class_put_profile(struct lustre_profile *lprof)
1128 {
1129         spin_lock(&lustre_profile_list_lock);
1130         if ((--lprof->lp_refs) > 0) {
1131                 LASSERT(lprof->lp_refs > 0);
1132                 spin_unlock(&lustre_profile_list_lock);
1133                 return;
1134         }
1135         spin_unlock(&lustre_profile_list_lock);
1136
1137         /* confirm not a negative number */
1138         LASSERT(lprof->lp_refs == 0);
1139
1140         /*
1141          * At least one class_del_profile/profiles must be called
1142          * on the target profile or lustre_profile_list will corrupt
1143          */
1144         LASSERT(lprof->lp_list_deleted);
1145         OBD_FREE(lprof->lp_profile, strlen(lprof->lp_profile) + 1);
1146         OBD_FREE(lprof->lp_dt, strlen(lprof->lp_dt) + 1);
1147         if (lprof->lp_md)
1148                 OBD_FREE(lprof->lp_md, strlen(lprof->lp_md) + 1);
1149         OBD_FREE(lprof, sizeof(*lprof));
1150 }
1151 EXPORT_SYMBOL(class_put_profile);
1152
1153 /* COMPAT_146 */
1154 void class_del_profiles(void)
1155 {
1156         struct lustre_profile *lprof, *n;
1157         ENTRY;
1158
1159         spin_lock(&lustre_profile_list_lock);
1160         list_for_each_entry_safe(lprof, n, &lustre_profile_list, lp_list) {
1161                 list_del(&lprof->lp_list);
1162                 lprof->lp_list_deleted = true;
1163                 spin_unlock(&lustre_profile_list_lock);
1164
1165                 class_put_profile(lprof);
1166
1167                 spin_lock(&lustre_profile_list_lock);
1168         }
1169         spin_unlock(&lustre_profile_list_lock);
1170         EXIT;
1171 }
1172 EXPORT_SYMBOL(class_del_profiles);
1173
1174 /*
1175  * We can't call lquota_process_config directly because
1176  * it lives in a module that must be loaded after this one.
1177  */
1178 #ifdef HAVE_SERVER_SUPPORT
1179 static int (*quota_process_config)(struct lustre_cfg *lcfg) = NULL;
1180 #endif /* HAVE_SERVER_SUPPORT */
1181
1182 /**
1183  * Rename the proc parameter in \a cfg with a new name \a new_name.
1184  *
1185  * \param cfg      config structure which contains the proc parameter
1186  * \param new_name new name of the proc parameter
1187  *
1188  * \retval valid-pointer    pointer to the newly-allocated config structure
1189  *                          which contains the renamed proc parameter
1190  * \retval ERR_PTR(-EINVAL) if \a cfg or \a new_name is NULL, or \a cfg does
1191  *                          not contain a proc parameter
1192  * \retval ERR_PTR(-ENOMEM) if memory allocation failure occurs
1193  */
1194 struct lustre_cfg *lustre_cfg_rename(struct lustre_cfg *cfg,
1195                                      const char *new_name)
1196 {
1197         struct lustre_cfg_bufs *bufs = NULL;
1198         struct lustre_cfg *new_cfg = NULL;
1199         char *param = NULL;
1200         char *new_param = NULL;
1201         char *value = NULL;
1202         int name_len = 0;
1203         int new_len = 0;
1204
1205         ENTRY;
1206
1207         if (!cfg || !new_name)
1208                 GOTO(out_nocfg, new_cfg = ERR_PTR(-EINVAL));
1209
1210         param = lustre_cfg_string(cfg, 1);
1211         if (!param)
1212                 GOTO(out_nocfg, new_cfg = ERR_PTR(-EINVAL));
1213
1214         value = strchr(param, '=');
1215         if (value)
1216                 name_len = value - param;
1217         else
1218                 name_len = strlen(param);
1219
1220         new_len = LUSTRE_CFG_BUFLEN(cfg, 1) + strlen(new_name) - name_len;
1221
1222         OBD_ALLOC(new_param, new_len);
1223         if (!new_param)
1224                 GOTO(out_nocfg, new_cfg = ERR_PTR(-ENOMEM));
1225
1226         strlcpy(new_param, new_name, new_len);
1227         if (value)
1228                 strcat(new_param, value);
1229
1230         OBD_ALLOC_PTR(bufs);
1231         if (!bufs)
1232                 GOTO(out_free_param, new_cfg = ERR_PTR(-ENOMEM));
1233
1234         lustre_cfg_bufs_reset(bufs, NULL);
1235         lustre_cfg_bufs_init(bufs, cfg);
1236         lustre_cfg_bufs_set_string(bufs, 1, new_param);
1237
1238         OBD_ALLOC(new_cfg, lustre_cfg_len(bufs->lcfg_bufcount,
1239                                           bufs->lcfg_buflen));
1240         if (!new_cfg)
1241                 GOTO(out_free_buf, new_cfg = ERR_PTR(-ENOMEM));
1242
1243         lustre_cfg_init(new_cfg, cfg->lcfg_command, bufs);
1244
1245         new_cfg->lcfg_num = cfg->lcfg_num;
1246         new_cfg->lcfg_flags = cfg->lcfg_flags;
1247         new_cfg->lcfg_nid = cfg->lcfg_nid;
1248         new_cfg->lcfg_nal = cfg->lcfg_nal;
1249 out_free_buf:
1250         OBD_FREE_PTR(bufs);
1251 out_free_param:
1252         OBD_FREE(new_param, new_len);
1253 out_nocfg:
1254         RETURN(new_cfg);
1255 }
1256 EXPORT_SYMBOL(lustre_cfg_rename);
1257
1258 static ssize_t process_param2_config(struct lustre_cfg *lcfg)
1259 {
1260         char *param = lustre_cfg_string(lcfg, 1);
1261         char *upcall = lustre_cfg_string(lcfg, 2);
1262         struct kobject *kobj = NULL;
1263         const char *subsys = param;
1264         char *argv[] = {
1265                 [0] = "/usr/sbin/lctl",
1266                 [1] = "set_param",
1267                 [2] = param,
1268                 [3] = NULL
1269         };
1270         ktime_t start;
1271         ktime_t end;
1272         size_t len;
1273         int rc;
1274
1275         ENTRY;
1276         print_lustre_cfg(lcfg);
1277
1278         len = strcspn(param, ".=");
1279         if (!len)
1280                 return -EINVAL;
1281
1282         /* If we find '=' then its the top level sysfs directory */
1283         if (param[len] == '=')
1284                 return class_set_global(param);
1285
1286         subsys = kstrndup(param, len, GFP_KERNEL);
1287         if (!subsys)
1288                 return -ENOMEM;
1289
1290         kobj = kset_find_obj(lustre_kset, subsys);
1291         kfree(subsys);
1292         if (kobj) {
1293                 char *value = param;
1294                 char *envp[4];
1295                 int i;
1296
1297                 param = strsep(&value, "=");
1298                 envp[0] = kasprintf(GFP_KERNEL, "PARAM=%s", param);
1299                 envp[1] = kasprintf(GFP_KERNEL, "SETTING=%s", value);
1300                 envp[2] = kasprintf(GFP_KERNEL, "TIME=%lld",
1301                                     ktime_get_real_seconds());
1302                 envp[3] = NULL;
1303
1304                 rc = kobject_uevent_env(kobj, KOBJ_CHANGE, envp);
1305                 for (i = 0; i < ARRAY_SIZE(envp); i++)
1306                         kfree(envp[i]);
1307
1308                 kobject_put(kobj);
1309
1310                 RETURN(rc);
1311         }
1312
1313         /* Add upcall processing here. Now only lctl is supported */
1314         if (strcmp(upcall, LCTL_UPCALL) != 0) {
1315                 CERROR("Unsupported upcall %s\n", upcall);
1316                 RETURN(-EINVAL);
1317         }
1318
1319         start = ktime_get();
1320         rc = call_usermodehelper(argv[0], argv, NULL, UMH_WAIT_PROC);
1321         end = ktime_get();
1322
1323         if (rc < 0) {
1324                 CERROR("lctl: error invoking upcall %s %s %s: rc = %d; "
1325                        "time %ldus\n", argv[0], argv[1], argv[2], rc,
1326                        (long)ktime_us_delta(end, start));
1327         } else {
1328                 CDEBUG(D_HA, "lctl: invoked upcall %s %s %s, time %ldus\n",
1329                        argv[0], argv[1], argv[2],
1330                        (long)ktime_us_delta(end, start));
1331                        rc = 0;
1332         }
1333
1334         RETURN(rc);
1335 }
1336
1337 #ifdef HAVE_SERVER_SUPPORT
1338 void lustre_register_quota_process_config(int (*qpc)(struct lustre_cfg *lcfg))
1339 {
1340         quota_process_config = qpc;
1341 }
1342 EXPORT_SYMBOL(lustre_register_quota_process_config);
1343 #endif /* HAVE_SERVER_SUPPORT */
1344
1345 /**
1346  * Process configuration commands given in lustre_cfg form.
1347  * These may come from direct calls (e.g. class_manual_cleanup)
1348  * or processing the config llog, or ioctl from lctl.
1349  */
1350 int class_process_config(struct lustre_cfg *lcfg)
1351 {
1352         struct obd_device *obd;
1353         int err;
1354
1355         LASSERT(lcfg && !IS_ERR(lcfg));
1356         CDEBUG(D_IOCTL, "processing cmd: %x\n", lcfg->lcfg_command);
1357
1358         /* Commands that don't need a device */
1359         switch (lcfg->lcfg_command) {
1360         case LCFG_ATTACH: {
1361                 err = class_attach(lcfg);
1362                 GOTO(out, err);
1363         }
1364         case LCFG_ADD_UUID: {
1365                 CDEBUG(D_IOCTL,
1366                        "adding mapping from uuid %s to nid %#llx (%s)\n",
1367                        lustre_cfg_string(lcfg, 1), lcfg->lcfg_nid,
1368                        libcfs_nid2str(lcfg->lcfg_nid));
1369
1370                 err = class_add_uuid(lustre_cfg_string(lcfg, 1),
1371                                      lcfg->lcfg_nid);
1372                 GOTO(out, err);
1373         }
1374         case LCFG_DEL_UUID: {
1375                 CDEBUG(D_IOCTL, "removing mappings for uuid %s\n",
1376                        (lcfg->lcfg_bufcount < 2 || LUSTRE_CFG_BUFLEN(lcfg, 1) ==
1377                         0) ? "<all uuids>" : lustre_cfg_string(lcfg, 1));
1378
1379                 err = class_del_uuid(lustre_cfg_string(lcfg, 1));
1380                 GOTO(out, err);
1381         }
1382         case LCFG_MOUNTOPT: {
1383                 CDEBUG(D_IOCTL, "mountopt: profile %s osc %s mdc %s\n",
1384                        lustre_cfg_string(lcfg, 1),
1385                        lustre_cfg_string(lcfg, 2),
1386                        lustre_cfg_string(lcfg, 3));
1387                 /*
1388                  * set these mount options somewhere, so ll_fill_super
1389                  * can find them.
1390                  */
1391                 err = class_add_profile(LUSTRE_CFG_BUFLEN(lcfg, 1),
1392                                         lustre_cfg_string(lcfg, 1),
1393                                         LUSTRE_CFG_BUFLEN(lcfg, 2),
1394                                         lustre_cfg_string(lcfg, 2),
1395                                         LUSTRE_CFG_BUFLEN(lcfg, 3),
1396                                         lustre_cfg_string(lcfg, 3));
1397                 GOTO(out, err);
1398         }
1399         case LCFG_DEL_MOUNTOPT: {
1400                 CDEBUG(D_IOCTL, "mountopt: profile %s\n",
1401                        lustre_cfg_string(lcfg, 1));
1402                 class_del_profile(lustre_cfg_string(lcfg, 1));
1403                 GOTO(out, err = 0);
1404         }
1405         case LCFG_SET_TIMEOUT: {
1406                 CDEBUG(D_IOCTL, "changing lustre timeout from %d to %d\n",
1407                        obd_timeout, lcfg->lcfg_num);
1408                 obd_timeout = max(lcfg->lcfg_num, 1U);
1409                 obd_timeout_set = 1;
1410                 GOTO(out, err = 0);
1411         }
1412         case LCFG_SET_LDLM_TIMEOUT: {
1413                 CDEBUG(D_IOCTL, "changing lustre ldlm_timeout from %d to %d\n",
1414                        ldlm_timeout, lcfg->lcfg_num);
1415                 ldlm_timeout = max(lcfg->lcfg_num, 1U);
1416                 if (ldlm_timeout >= obd_timeout)
1417                         ldlm_timeout = max(obd_timeout / 3, 1U);
1418                 ldlm_timeout_set = 1;
1419                 GOTO(out, err = 0);
1420         }
1421         case LCFG_SET_UPCALL: {
1422                 LCONSOLE_ERROR_MSG(0x15a, "recovery upcall is deprecated\n");
1423                 /* COMPAT_146 Don't fail on old configs */
1424                 GOTO(out, err = 0);
1425         }
1426         case LCFG_MARKER: {
1427                 struct cfg_marker *marker;
1428
1429                 marker = lustre_cfg_buf(lcfg, 1);
1430                 CDEBUG(D_IOCTL, "marker %d (%#x) %.16s %s\n", marker->cm_step,
1431                        marker->cm_flags, marker->cm_tgtname,
1432                        marker->cm_comment);
1433                 GOTO(out, err = 0);
1434         }
1435         case LCFG_PARAM: {
1436                 char *tmp;
1437
1438                 /* llite has no OBD */
1439                 if (class_match_param(lustre_cfg_string(lcfg, 1),
1440                                       PARAM_LLITE, NULL) == 0) {
1441                         struct lustre_sb_info *lsi;
1442                         unsigned long addr;
1443                         ssize_t count;
1444
1445                         /*
1446                          * The instance name contains the sb:
1447                          * lustre-client-aacfe000
1448                          */
1449                         tmp = strrchr(lustre_cfg_string(lcfg, 0), '-');
1450                         if (!tmp || !*(++tmp))
1451                                 GOTO(out, err = -EINVAL);
1452
1453                         if (sscanf(tmp, "%lx", &addr) != 1)
1454                                 GOTO(out, err = -EINVAL);
1455
1456                         lsi = s2lsi((struct super_block *)addr);
1457                         /* This better be a real Lustre superblock! */
1458                         LASSERT(lsi->lsi_lmd->lmd_magic == LMD_MAGIC);
1459
1460                         count = class_modify_config(lcfg, PARAM_LLITE,
1461                                                     lsi->lsi_kobj);
1462                         err = count < 0 ? count : 0;
1463                         GOTO(out, err);
1464                 } else if ((class_match_param(lustre_cfg_string(lcfg, 1),
1465                                               PARAM_SYS, &tmp) == 0)) {
1466                         /* Global param settings */
1467                         err = class_set_global(tmp);
1468                         /*
1469                          * Client or server should not fail to mount if
1470                          * it hits an unknown configuration parameter.
1471                          */
1472                         if (err < 0)
1473                                 CWARN("Ignoring unknown param %s\n", tmp);
1474
1475                         GOTO(out, err = 0);
1476 #ifdef HAVE_SERVER_SUPPORT
1477                 } else if ((class_match_param(lustre_cfg_string(lcfg, 1),
1478                                               PARAM_QUOTA, &tmp) == 0) &&
1479                            quota_process_config) {
1480                         err = (*quota_process_config)(lcfg);
1481                         GOTO(out, err);
1482 #endif /* HAVE_SERVER_SUPPORT */
1483                 }
1484
1485                 break;
1486         }
1487         case LCFG_SET_PARAM: {
1488                 err = process_param2_config(lcfg);
1489                 GOTO(out, err = 0);
1490         }
1491         }
1492         /* Commands that require a device */
1493         obd = class_name2obd(lustre_cfg_string(lcfg, 0));
1494         if (!obd) {
1495                 if (!LUSTRE_CFG_BUFLEN(lcfg, 0))
1496                         CERROR("this lcfg command requires a device name\n");
1497                 else
1498                         CERROR("no device for: %s\n",
1499                                lustre_cfg_string(lcfg, 0));
1500
1501                 GOTO(out, err = -EINVAL);
1502         }
1503         switch(lcfg->lcfg_command) {
1504         case LCFG_SETUP: {
1505                 err = class_setup(obd, lcfg);
1506                 GOTO(out, err);
1507         }
1508         case LCFG_DETACH: {
1509                 err = class_detach(obd, lcfg);
1510                 GOTO(out, err = 0);
1511         }
1512         case LCFG_CLEANUP: {
1513                 err = class_cleanup(obd, lcfg);
1514                 GOTO(out, err = 0);
1515         }
1516         case LCFG_ADD_CONN: {
1517                 err = class_add_conn(obd, lcfg);
1518                 GOTO(out, err = 0);
1519         }
1520         case LCFG_DEL_CONN: {
1521                 err = class_del_conn(obd, lcfg);
1522                 GOTO(out, err = 0);
1523         }
1524         case LCFG_POOL_NEW: {
1525                 err = obd_pool_new(obd, lustre_cfg_string(lcfg, 2));
1526                 GOTO(out, err = 0);
1527         }
1528         case LCFG_POOL_ADD: {
1529                 err = obd_pool_add(obd, lustre_cfg_string(lcfg, 2),
1530                                    lustre_cfg_string(lcfg, 3));
1531                 GOTO(out, err = 0);
1532         }
1533         case LCFG_POOL_REM: {
1534                 err = obd_pool_rem(obd, lustre_cfg_string(lcfg, 2),
1535                                    lustre_cfg_string(lcfg, 3));
1536                 GOTO(out, err = 0);
1537         }
1538         case LCFG_POOL_DEL: {
1539                 err = obd_pool_del(obd, lustre_cfg_string(lcfg, 2));
1540                 GOTO(out, err = 0);
1541         }
1542         /*
1543          * Process config log ADD_MDC record twice to add MDC also to LOV
1544          * for Data-on-MDT:
1545          *
1546          * add 0:lustre-clilmv 1:lustre-MDT0000_UUID 2:0 3:1
1547          *     4:lustre-MDT0000-mdc_UUID
1548          */
1549         case LCFG_ADD_MDC: {
1550                 struct obd_device *lov_obd;
1551                 char *clilmv;
1552
1553                 err = obd_process_config(obd, sizeof(*lcfg), lcfg);
1554                 if (err)
1555                         GOTO(out, err);
1556
1557                 /* make sure this is client LMV log entry */
1558                 clilmv = strstr(lustre_cfg_string(lcfg, 0), "clilmv");
1559                 if (!clilmv)
1560                         GOTO(out, err);
1561
1562                 /*
1563                  * replace 'lmv' with 'lov' name to address LOV device and
1564                  * process llog record to add MDC there.
1565                  */
1566                 clilmv[4] = 'o';
1567                 lov_obd = class_name2obd(lustre_cfg_string(lcfg, 0));
1568                 if (lov_obd) {
1569                         err = obd_process_config(lov_obd, sizeof(*lcfg), lcfg);
1570                 } else {
1571                         err = -ENOENT;
1572                         CERROR("%s: Cannot find LOV by %s name, rc = %d\n",
1573                                obd->obd_name, lustre_cfg_string(lcfg, 0), err);
1574                 }
1575                 /* restore 'lmv' name */
1576                 clilmv[4] = 'm';
1577                 GOTO(out, err);
1578         }
1579         default: {
1580                 err = obd_process_config(obd, sizeof(*lcfg), lcfg);
1581                 GOTO(out, err);
1582         }
1583         }
1584         EXIT;
1585 out:
1586         if ((err < 0) && !(lcfg->lcfg_command & LCFG_REQUIRED)) {
1587                 CWARN("Ignoring error %d on optional command %#x\n", err,
1588                       lcfg->lcfg_command);
1589                 err = 0;
1590         }
1591         return err;
1592 }
1593 EXPORT_SYMBOL(class_process_config);
1594
1595 ssize_t class_modify_config(struct lustre_cfg *lcfg, const char *prefix,
1596                             struct kobject *kobj)
1597 {
1598         struct kobj_type *typ;
1599         ssize_t count = 0;
1600         int i;
1601
1602         if (lcfg->lcfg_command != LCFG_PARAM) {
1603                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1604                 return -EINVAL;
1605         }
1606
1607         typ = get_ktype(kobj);
1608         if (!typ || !typ->default_attrs)
1609                 return -ENODEV;
1610
1611         print_lustre_cfg(lcfg);
1612
1613         /*
1614          * e.g. tunefs.lustre --param mdt.group_upcall=foo /r/tmp/lustre-mdt
1615          * or   lctl conf_param lustre-MDT0000.mdt.group_upcall=bar
1616          * or   lctl conf_param lustre-OST0000.osc.max_dirty_mb=36
1617          */
1618         for (i = 1; i < lcfg->lcfg_bufcount; i++) {
1619                 struct attribute *attr;
1620                 size_t keylen;
1621                 char *value;
1622                 char *key;
1623                 int j;
1624
1625                 key = lustre_cfg_buf(lcfg, i);
1626                 /* Strip off prefix */
1627                 if (class_match_param(key, prefix, &key))
1628                         /*
1629                          * If the prefix doesn't match, return error so we
1630                          * can pass it down the stack
1631                          */
1632                         return -EINVAL;
1633
1634                 value = strchr(key, '=');
1635                 if (!value || *(value + 1) == 0) {
1636                         CERROR("%s: can't parse param '%s' (missing '=')\n",
1637                                lustre_cfg_string(lcfg, 0),
1638                                lustre_cfg_string(lcfg, i));
1639                         /* continue parsing other params */
1640                         continue;
1641                 }
1642                 keylen = value - key;
1643                 value++;
1644
1645                 attr = NULL;
1646                 for (j = 0; typ->default_attrs[j]; j++) {
1647                         if (!strncmp(typ->default_attrs[j]->name, key,
1648                                      keylen)) {
1649                                 attr = typ->default_attrs[j];
1650                                 break;
1651                         }
1652                 }
1653
1654                 if (!attr) {
1655                         char *envp[4], *param, *path;
1656
1657                         path = kobject_get_path(kobj, GFP_KERNEL);
1658                         if (!path)
1659                                 return -EINVAL;
1660
1661                         /* convert sysfs path to uevent format */
1662                         param = path;
1663                         while ((param = strchr(param, '/')) != NULL)
1664                                 *param = '.';
1665
1666                         param = strstr(path, "fs.lustre.") + 10;
1667
1668                         envp[0] = kasprintf(GFP_KERNEL, "PARAM=%s.%.*s",
1669                                             param, (int) keylen, key);
1670                         envp[1] = kasprintf(GFP_KERNEL, "SETTING=%s", value);
1671                         envp[2] = kasprintf(GFP_KERNEL, "TIME=%lld",
1672                                             ktime_get_real_seconds());
1673                         envp[3] = NULL;
1674
1675                         if (kobject_uevent_env(kobj, KOBJ_CHANGE, envp)) {
1676                                 CERROR("%s: failed to send uevent %s\n",
1677                                        kobject_name(kobj), key);
1678                         }
1679
1680                         for (i = 0; i < ARRAY_SIZE(envp); i++)
1681                                 kfree(envp[i]);
1682                         kfree(path);
1683                 } else {
1684                         count += lustre_attr_store(kobj, attr, value,
1685                                                    strlen(value));
1686                 }
1687         }
1688         return count;
1689 }
1690 EXPORT_SYMBOL(class_modify_config);
1691
1692 /*
1693  * Supplemental functions for config logs, it allocates lustre_cfg
1694  * buffers plus initialized llog record header at the beginning.
1695  */
1696 struct llog_cfg_rec *lustre_cfg_rec_new(int cmd, struct lustre_cfg_bufs *bufs)
1697 {
1698         struct llog_cfg_rec *lcr;
1699         int reclen;
1700
1701         ENTRY;
1702
1703         reclen = lustre_cfg_len(bufs->lcfg_bufcount, bufs->lcfg_buflen);
1704         reclen = llog_data_len(reclen) + sizeof(struct llog_rec_hdr) +
1705                  sizeof(struct llog_rec_tail);
1706
1707         OBD_ALLOC(lcr, reclen);
1708         if (!lcr)
1709                 RETURN(NULL);
1710
1711         lustre_cfg_init(&lcr->lcr_cfg, cmd, bufs);
1712
1713         lcr->lcr_hdr.lrh_len = reclen;
1714         lcr->lcr_hdr.lrh_type = OBD_CFG_REC;
1715
1716         RETURN(lcr);
1717 }
1718 EXPORT_SYMBOL(lustre_cfg_rec_new);
1719
1720 void lustre_cfg_rec_free(struct llog_cfg_rec *lcr)
1721 {
1722         ENTRY;
1723         OBD_FREE(lcr, lcr->lcr_hdr.lrh_len);
1724         EXIT;
1725 }
1726 EXPORT_SYMBOL(lustre_cfg_rec_free);
1727
1728 /**
1729  * Parse a configuration llog, doing various manipulations on them
1730  * for various reasons, (modifications for compatibility, skip obsolete
1731  * records, change uuids, etc), then class_process_config() resulting
1732  * net records.
1733  */
1734 int class_config_llog_handler(const struct lu_env *env,
1735                               struct llog_handle *handle,
1736                               struct llog_rec_hdr *rec, void *data)
1737 {
1738         struct config_llog_instance *cfg = data;
1739         int cfg_len = rec->lrh_len;
1740         char *cfg_buf = (char *) (rec + 1);
1741         int rc = 0;
1742         ENTRY;
1743
1744         /* class_config_dump_handler(handle, rec, data); */
1745
1746         switch (rec->lrh_type) {
1747         case OBD_CFG_REC: {
1748                 struct lustre_cfg *lcfg, *lcfg_new;
1749                 struct lustre_cfg_bufs bufs;
1750                 char *inst_name = NULL;
1751                 int inst_len = 0;
1752                 int swab = 0;
1753
1754                 lcfg = (struct lustre_cfg *)cfg_buf;
1755                 if (lcfg->lcfg_version == __swab32(LUSTRE_CFG_VERSION)) {
1756                         lustre_swab_lustre_cfg(lcfg);
1757                         swab = 1;
1758                 }
1759
1760                 rc = lustre_cfg_sanity_check(cfg_buf, cfg_len);
1761                 if (rc)
1762                         GOTO(out, rc);
1763
1764                 /* Figure out config state info */
1765                 if (lcfg->lcfg_command == LCFG_MARKER) {
1766                         struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
1767                         lustre_swab_cfg_marker(marker, swab,
1768                                                LUSTRE_CFG_BUFLEN(lcfg, 1));
1769                         CDEBUG(D_CONFIG, "Marker, inst_flg=%#x mark_flg=%#x\n",
1770                                cfg->cfg_flags, marker->cm_flags);
1771                         if (marker->cm_flags & CM_START) {
1772                                 /* all previous flags off */
1773                                 cfg->cfg_flags = CFG_F_MARKER;
1774                                 server_name2index(marker->cm_tgtname,
1775                                                   &cfg->cfg_lwp_idx, NULL);
1776                                 if (marker->cm_flags & CM_SKIP) {
1777                                         cfg->cfg_flags |= CFG_F_SKIP;
1778                                         CDEBUG(D_CONFIG, "SKIP #%d\n",
1779                                                marker->cm_step);
1780                                 } else if ((marker->cm_flags & CM_EXCLUDE) ||
1781                                            (cfg->cfg_sb &&
1782                                            lustre_check_exclusion(cfg->cfg_sb,
1783                                                         marker->cm_tgtname))) {
1784                                         cfg->cfg_flags |= CFG_F_EXCLUDE;
1785                                         CDEBUG(D_CONFIG, "EXCLUDE %d\n",
1786                                                marker->cm_step);
1787                                 }
1788                         } else if (marker->cm_flags & CM_END) {
1789                                 cfg->cfg_flags = 0;
1790                         }
1791                 }
1792                 /*
1793                  * A config command without a start marker before it is
1794                  * illegal
1795                  */
1796                 if (!(cfg->cfg_flags & CFG_F_MARKER) &&
1797                     (lcfg->lcfg_command != LCFG_MARKER)) {
1798                         CWARN("Skip config outside markers, (inst: %016lx, uuid: %s, flags: %#x)\n",
1799                                 cfg->cfg_instance,
1800                                 cfg->cfg_uuid.uuid, cfg->cfg_flags);
1801                         cfg->cfg_flags |= CFG_F_SKIP;
1802                 }
1803                 if (cfg->cfg_flags & CFG_F_SKIP) {
1804                         CDEBUG(D_CONFIG, "skipping %#x\n",
1805                                cfg->cfg_flags);
1806                         rc = 0;
1807                         /* No processing! */
1808                         break;
1809                 }
1810
1811                 /*
1812                  * For interoperability between 1.8 and 2.0,
1813                  * rename "mds" OBD device type to "mdt".
1814                  */
1815                 {
1816                         char *typename = lustre_cfg_string(lcfg, 1);
1817                         char *index = lustre_cfg_string(lcfg, 2);
1818
1819                         if ((lcfg->lcfg_command == LCFG_ATTACH && typename &&
1820                             strcmp(typename, "mds") == 0)) {
1821                                 CWARN("For 1.8 interoperability, rename obd "
1822                                         "type from mds to mdt\n");
1823                                 typename[2] = 't';
1824                         }
1825                         if ((lcfg->lcfg_command == LCFG_SETUP && index &&
1826                             strcmp(index, "type") == 0)) {
1827                                 CDEBUG(D_INFO, "For 1.8 interoperability, "
1828                                        "set this index to '0'\n");
1829                                 index[0] = '0';
1830                                 index[1] = 0;
1831                         }
1832                 }
1833
1834 #ifdef HAVE_SERVER_SUPPORT
1835                 /* newer MDS replaces LOV/OSC with LOD/OSP */
1836                 if ((lcfg->lcfg_command == LCFG_ATTACH ||
1837                      lcfg->lcfg_command == LCFG_SET_PARAM ||
1838                      lcfg->lcfg_command == LCFG_PARAM) &&
1839                     cfg->cfg_sb && IS_MDT(s2lsi(cfg->cfg_sb))) {
1840                         char *typename = lustre_cfg_string(lcfg, 1);
1841
1842                         if (typename &&
1843                             strcmp(typename, LUSTRE_LOV_NAME) == 0) {
1844                                 CDEBUG(D_CONFIG,
1845                                        "For 2.x interoperability, rename obd "
1846                                        "type from lov to lod (%s)\n",
1847                                        s2lsi(cfg->cfg_sb)->lsi_svname);
1848                                 strcpy(typename, LUSTRE_LOD_NAME);
1849                         }
1850                         if (typename &&
1851                             strcmp(typename, LUSTRE_OSC_NAME) == 0) {
1852                                 CDEBUG(D_CONFIG,
1853                                        "For 2.x interoperability, rename obd "
1854                                        "type from osc to osp (%s)\n",
1855                                        s2lsi(cfg->cfg_sb)->lsi_svname);
1856                                 strcpy(typename, LUSTRE_OSP_NAME);
1857                         }
1858                 }
1859 #endif /* HAVE_SERVER_SUPPORT */
1860
1861                 if (cfg->cfg_flags & CFG_F_EXCLUDE) {
1862                         CDEBUG(D_CONFIG, "cmd: %x marked EXCLUDED\n",
1863                                lcfg->lcfg_command);
1864                         if (lcfg->lcfg_command == LCFG_LOV_ADD_OBD)
1865                                 /* Add inactive instead */
1866                                 lcfg->lcfg_command = LCFG_LOV_ADD_INA;
1867                 }
1868
1869                 lustre_cfg_bufs_reset(&bufs, NULL);
1870                 lustre_cfg_bufs_init(&bufs, lcfg);
1871
1872                 if (cfg->cfg_instance &&
1873                     lcfg->lcfg_command != LCFG_SPTLRPC_CONF &&
1874                     LUSTRE_CFG_BUFLEN(lcfg, 0) > 0) {
1875                         inst_len = LUSTRE_CFG_BUFLEN(lcfg, 0) +
1876                                 LUSTRE_MAXINSTANCE + 4;
1877                         OBD_ALLOC(inst_name, inst_len);
1878                         if (!inst_name)
1879                                 GOTO(out, rc = -ENOMEM);
1880                         snprintf(inst_name, inst_len, "%s-%016lx",
1881                                 lustre_cfg_string(lcfg, 0),
1882                                 cfg->cfg_instance);
1883                         lustre_cfg_bufs_set_string(&bufs, 0, inst_name);
1884                         CDEBUG(D_CONFIG, "cmd %x, instance name: %s\n",
1885                                lcfg->lcfg_command, inst_name);
1886                 }
1887
1888                 /* override llog UUID for clients, to insure they are unique */
1889                 if (cfg->cfg_instance && lcfg->lcfg_command == LCFG_ATTACH)
1890                         lustre_cfg_bufs_set_string(&bufs, 2,
1891                                                    cfg->cfg_uuid.uuid);
1892                 /*
1893                  * sptlrpc config record, we expect 2 data segments:
1894                  *  [0]: fs_name/target_name,
1895                  *  [1]: rule string
1896                  * moving them to index [1] and [2], and insert MGC's
1897                  * obdname at index [0].
1898                  */
1899                 if (cfg->cfg_instance &&
1900                     lcfg->lcfg_command == LCFG_SPTLRPC_CONF) {
1901                         /* After ASLR changes cfg_instance this needs fixing */
1902                         /* "obd" is set in config_log_find_or_add() */
1903                         struct obd_device *obd = (void *)cfg->cfg_instance;
1904
1905                         lustre_cfg_bufs_set(&bufs, 2, bufs.lcfg_buf[1],
1906                                             bufs.lcfg_buflen[1]);
1907                         lustre_cfg_bufs_set(&bufs, 1, bufs.lcfg_buf[0],
1908                                             bufs.lcfg_buflen[0]);
1909                         lustre_cfg_bufs_set_string(&bufs, 0,
1910                                                    obd->obd_name);
1911                 }
1912
1913                 /*
1914                  * Add net info to setup command
1915                  * if given on command line.
1916                  * So config log will be:
1917                  * [0]: client name
1918                  * [1]: client UUID
1919                  * [2]: server UUID
1920                  * [3]: inactive-on-startup
1921                  * [4]: restrictive net
1922                  */
1923                 if (cfg && cfg->cfg_sb && s2lsi(cfg->cfg_sb) &&
1924                     !IS_SERVER(s2lsi(cfg->cfg_sb))) {
1925                         struct lustre_sb_info *lsi = s2lsi(cfg->cfg_sb);
1926                         char *nidnet = lsi->lsi_lmd->lmd_nidnet;
1927
1928                         if (lcfg->lcfg_command == LCFG_SETUP &&
1929                             lcfg->lcfg_bufcount != 2 && nidnet) {
1930                                 CDEBUG(D_CONFIG, "Adding net %s info to setup "
1931                                        "command for client %s\n", nidnet,
1932                                        lustre_cfg_string(lcfg, 0));
1933                                 lustre_cfg_bufs_set_string(&bufs, 4, nidnet);
1934                         }
1935                 }
1936
1937                 /*
1938                  * Skip add_conn command if uuid is
1939                  * not on restricted net
1940                  */
1941                 if (cfg && cfg->cfg_sb && s2lsi(cfg->cfg_sb) &&
1942                     !IS_SERVER(s2lsi(cfg->cfg_sb))) {
1943                         struct lustre_sb_info *lsi = s2lsi(cfg->cfg_sb);
1944                         char *uuid_str = lustre_cfg_string(lcfg, 1);
1945
1946                         if (lcfg->lcfg_command == LCFG_ADD_CONN &&
1947                             lsi->lsi_lmd->lmd_nidnet &&
1948                             LNET_NIDNET(libcfs_str2nid(uuid_str)) !=
1949                             libcfs_str2net(lsi->lsi_lmd->lmd_nidnet)) {
1950                                 CDEBUG(D_CONFIG, "skipping add_conn for %s\n",
1951                                        uuid_str);
1952                                 rc = 0;
1953                                 /* No processing! */
1954                                 break;
1955                         }
1956                 }
1957
1958                 OBD_ALLOC(lcfg_new, lustre_cfg_len(bufs.lcfg_bufcount,
1959                                                    bufs.lcfg_buflen));
1960                 if (!lcfg_new)
1961                         GOTO(out, rc = -ENOMEM);
1962
1963                 lustre_cfg_init(lcfg_new, lcfg->lcfg_command, &bufs);
1964                 lcfg_new->lcfg_num   = lcfg->lcfg_num;
1965                 lcfg_new->lcfg_flags = lcfg->lcfg_flags;
1966
1967                 /*
1968                  * XXX Hack to try to remain binary compatible with
1969                  * pre-newconfig logs
1970                  */
1971                 if (lcfg->lcfg_nal != 0 &&      /* pre-newconfig log? */
1972                     (lcfg->lcfg_nid >> 32) == 0) {
1973                         __u32 addr = (__u32)(lcfg->lcfg_nid & 0xffffffff);
1974
1975                         lcfg_new->lcfg_nid =
1976                                 LNET_MKNID(LNET_MKNET(lcfg->lcfg_nal, 0), addr);
1977                         CWARN("Converted pre-newconfig NAL %d NID %x to %s\n",
1978                               lcfg->lcfg_nal, addr,
1979                               libcfs_nid2str(lcfg_new->lcfg_nid));
1980                 } else {
1981                         lcfg_new->lcfg_nid = lcfg->lcfg_nid;
1982                 }
1983
1984                 lcfg_new->lcfg_nal = 0; /* illegal value for obsolete field */
1985
1986                 rc = class_process_config(lcfg_new);
1987                 OBD_FREE(lcfg_new, lustre_cfg_len(lcfg_new->lcfg_bufcount,
1988                                                   lcfg_new->lcfg_buflens));
1989                 if (inst_name)
1990                         OBD_FREE(inst_name, inst_len);
1991                 break;
1992         }
1993         default:
1994                 CERROR("Unknown llog record type %#x encountered\n",
1995                        rec->lrh_type);
1996                 break;
1997         }
1998 out:
1999         if (rc) {
2000                 CERROR("%s: cfg command failed: rc = %d\n",
2001                         handle->lgh_ctxt->loc_obd->obd_name, rc);
2002                 class_config_dump_handler(NULL, handle, rec, data);
2003         }
2004         RETURN(rc);
2005 }
2006 EXPORT_SYMBOL(class_config_llog_handler);
2007
2008 int class_config_parse_llog(const struct lu_env *env, struct llog_ctxt *ctxt,
2009                             char *name, struct config_llog_instance *cfg)
2010 {
2011         struct llog_process_cat_data cd = {
2012                 .lpcd_first_idx = 0,
2013         };
2014         struct llog_handle *llh;
2015         llog_cb_t callback;
2016         int rc;
2017         ENTRY;
2018
2019         CDEBUG(D_INFO, "looking up llog %s\n", name);
2020         rc = llog_open(env, ctxt, &llh, NULL, name, LLOG_OPEN_EXISTS);
2021         if (rc)
2022                 RETURN(rc);
2023
2024         rc = llog_init_handle(env, llh, LLOG_F_IS_PLAIN, NULL);
2025         if (rc)
2026                 GOTO(parse_out, rc);
2027
2028         /* continue processing from where we last stopped to end-of-log */
2029         if (cfg) {
2030                 cd.lpcd_first_idx = cfg->cfg_last_idx;
2031                 callback = cfg->cfg_callback;
2032                 LASSERT(callback != NULL);
2033         } else {
2034                 callback = class_config_llog_handler;
2035         }
2036
2037         cd.lpcd_last_idx = 0;
2038
2039         rc = llog_process(env, llh, callback, cfg, &cd);
2040
2041         CDEBUG(D_CONFIG, "Processed log %s gen %d-%d (rc=%d)\n", name,
2042                cd.lpcd_first_idx + 1, cd.lpcd_last_idx, rc);
2043         if (cfg)
2044                 cfg->cfg_last_idx = cd.lpcd_last_idx;
2045
2046 parse_out:
2047         llog_close(env, llh);
2048         RETURN(rc);
2049 }
2050 EXPORT_SYMBOL(class_config_parse_llog);
2051
2052 /**
2053  * Parse config record and output dump in supplied buffer.
2054  *
2055  * This is separated from class_config_dump_handler() to use
2056  * for ioctl needs as well
2057  *
2058  * Sample Output:
2059  * - { index: 4, event: attach, device: lustrewt-clilov, type: lov,
2060  *     UUID: lustrewt-clilov_UUID }
2061  */
2062 int class_config_yaml_output(struct llog_rec_hdr *rec, char *buf, int size,
2063                              unsigned int *cfg_flags, bool raw)
2064 {
2065         struct lustre_cfg *lcfg = (struct lustre_cfg *)(rec + 1);
2066         char *ptr = buf;
2067         char *end = buf + size;
2068         int rc = 0, i;
2069         struct lcfg_type_data *ldata;
2070         int swab = 0;
2071
2072         LASSERT(rec->lrh_type == OBD_CFG_REC);
2073
2074         if (lcfg->lcfg_version == __swab32(LUSTRE_CFG_VERSION)) {
2075                 lustre_swab_lustre_cfg(lcfg);
2076                 swab = 1;
2077         }
2078
2079         rc = lustre_cfg_sanity_check(lcfg, rec->lrh_len);
2080         if (rc < 0)
2081                 return rc;
2082
2083         ldata = lcfg_cmd2data(lcfg->lcfg_command);
2084         if (!ldata)
2085                 return -ENOTTY;
2086
2087         if (lcfg->lcfg_command == LCFG_MARKER) {
2088                 struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
2089
2090                 lustre_swab_cfg_marker(marker, swab,
2091                                        LUSTRE_CFG_BUFLEN(lcfg, 1));
2092                 if (marker->cm_flags & CM_START) {
2093                         *cfg_flags = CFG_F_MARKER;
2094                         if (marker->cm_flags & CM_SKIP)
2095                                 *cfg_flags = CFG_F_SKIP;
2096                 } else if (marker->cm_flags & CM_END) {
2097                         *cfg_flags = 0;
2098                 }
2099                 if (likely(!raw))
2100                         return 0;
2101         }
2102
2103         /* entries outside marker are skipped */
2104         if (!(*cfg_flags & CFG_F_MARKER) && !raw)
2105                 return 0;
2106
2107         /* inside skipped marker */
2108         if (*cfg_flags & CFG_F_SKIP && !raw)
2109                 return 0;
2110
2111         /* form YAML entity */
2112         ptr += snprintf(ptr, end - ptr, "- { index: %u, event: %s",
2113                         rec->lrh_index, ldata->ltd_name);
2114         if (end - ptr <= 0)
2115                 goto out_overflow;
2116
2117         if (lcfg->lcfg_flags) {
2118                 ptr += snprintf(ptr, end - ptr, ", flags: %#08x",
2119                                 lcfg->lcfg_flags);
2120                 if (end - ptr <= 0)
2121                         goto out_overflow;
2122         }
2123         if (lcfg->lcfg_num) {
2124                 ptr += snprintf(ptr, end - ptr, ", num: %#08x",
2125                                 lcfg->lcfg_num);
2126                 if (end - ptr <= 0)
2127                         goto out_overflow;
2128         }
2129         if (lcfg->lcfg_nid) {
2130                 char nidstr[LNET_NIDSTR_SIZE];
2131
2132                 libcfs_nid2str_r(lcfg->lcfg_nid, nidstr, sizeof(nidstr));
2133                 ptr += snprintf(ptr, end - ptr, ", nid: %s(%#llx)",
2134                                 nidstr, lcfg->lcfg_nid);
2135                 if (end - ptr <= 0)
2136                         goto out_overflow;
2137         }
2138
2139         if (LUSTRE_CFG_BUFLEN(lcfg, 0) > 0) {
2140                 ptr += snprintf(ptr, end - ptr, ", device: %s",
2141                                 lustre_cfg_string(lcfg, 0));
2142                 if (end - ptr <= 0)
2143                         goto out_overflow;
2144         }
2145
2146         if (lcfg->lcfg_command == LCFG_SET_PARAM) {
2147                 /*
2148                  * set_param -P parameters have param=val here, separate
2149                  * them through pointer magic and print them out in
2150                  * native yamlese
2151                  */
2152                 char *cfg_str = lustre_cfg_string(lcfg, 1);
2153                 char *tmp = strchr(cfg_str, '=');
2154                 size_t len;
2155
2156                 if (!tmp)
2157                         goto out_done;
2158
2159                 ptr += snprintf(ptr, end - ptr, ", %s: ", ldata->ltd_bufs[0]);
2160                 len = tmp - cfg_str + 1;
2161                 snprintf(ptr, len, "%s", cfg_str);
2162                 ptr += len - 1;
2163
2164                 ptr += snprintf(ptr, end - ptr, ", %s: ", ldata->ltd_bufs[1]);
2165                 ptr += snprintf(ptr, end - ptr, "%s", tmp + 1);
2166
2167                 goto out_done;
2168         }
2169
2170         if (lcfg->lcfg_command == LCFG_MARKER) {
2171                 struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
2172
2173                 if (marker->cm_flags & CM_START) {
2174                         *cfg_flags = CFG_F_MARKER;
2175                         if (marker->cm_flags & CM_SKIP)
2176                                 *cfg_flags = CFG_F_SKIP;
2177                 } else if (marker->cm_flags & CM_END) {
2178                         *cfg_flags = 0;
2179                 }
2180                 ptr += snprintf(ptr, end - ptr, ", flags: %#04x",
2181                                 marker->cm_flags);
2182                 ptr += snprintf(ptr, end - ptr, ", version: %d.%d.%d.%d",
2183                                 OBD_OCD_VERSION_MAJOR(marker->cm_vers),
2184                                 OBD_OCD_VERSION_MINOR(marker->cm_vers),
2185                                 OBD_OCD_VERSION_PATCH(marker->cm_vers),
2186                                 OBD_OCD_VERSION_FIX(marker->cm_vers));
2187                 ptr += snprintf(ptr, end - ptr, ", createtime: %lld",
2188                                 marker->cm_createtime);
2189                 ptr += snprintf(ptr, end - ptr, ", canceltime: %lld",
2190                                 marker->cm_canceltime);
2191
2192                 goto out_done;
2193         }
2194
2195         for (i = 1; i < lcfg->lcfg_bufcount; i++) {
2196                 if (LUSTRE_CFG_BUFLEN(lcfg, i) > 0) {
2197                         ptr += snprintf(ptr, end - ptr, ", %s: %s",
2198                                         ldata->ltd_bufs[i - 1],
2199                                         lustre_cfg_string(lcfg, i));
2200                         if (end - ptr <= 0)
2201                                 goto out_overflow;
2202                 }
2203         }
2204
2205 out_done:
2206         ptr += snprintf(ptr, end - ptr, " }\n");
2207 out_overflow:
2208         /* Return consumed bytes.  If the buffer overflowed, zero last byte */
2209         rc = ptr - buf;
2210         if (rc > size) {
2211                 rc = -EOVERFLOW;
2212                 *(end - 1) = '\0';
2213         }
2214
2215         return rc;
2216 }
2217
2218 /**
2219  * parse config record and output dump in supplied buffer.
2220  * This is separated from class_config_dump_handler() to use
2221  * for ioctl needs as well
2222  */
2223 static int class_config_parse_rec(struct llog_rec_hdr *rec, char *buf, int size)
2224 {
2225         struct lustre_cfg       *lcfg = (struct lustre_cfg *)(rec + 1);
2226         char                    *ptr = buf;
2227         char                    *end = buf + size;
2228         int                      rc = 0;
2229
2230         ENTRY;
2231
2232         LASSERT(rec->lrh_type == OBD_CFG_REC);
2233         rc = lustre_cfg_sanity_check(lcfg, rec->lrh_len);
2234         if (rc < 0)
2235                 RETURN(rc);
2236
2237         ptr += snprintf(ptr, end-ptr, "cmd=%05x ", lcfg->lcfg_command);
2238         if (lcfg->lcfg_flags)
2239                 ptr += snprintf(ptr, end-ptr, "flags=%#08x ",
2240                                 lcfg->lcfg_flags);
2241
2242         if (lcfg->lcfg_num)
2243                 ptr += snprintf(ptr, end-ptr, "num=%#08x ", lcfg->lcfg_num);
2244
2245         if (lcfg->lcfg_nid) {
2246                 char nidstr[LNET_NIDSTR_SIZE];
2247
2248                 libcfs_nid2str_r(lcfg->lcfg_nid, nidstr, sizeof(nidstr));
2249                 ptr += snprintf(ptr, end-ptr, "nid=%s(%#llx)    ",
2250                                 nidstr, lcfg->lcfg_nid);
2251         }
2252
2253         if (lcfg->lcfg_command == LCFG_MARKER) {
2254                 struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
2255
2256                 ptr += snprintf(ptr, end-ptr, "marker=%d(%#x)%s '%s'",
2257                                 marker->cm_step, marker->cm_flags,
2258                                 marker->cm_tgtname, marker->cm_comment);
2259         } else {
2260                 int i;
2261
2262                 for (i = 0; i <  lcfg->lcfg_bufcount; i++) {
2263                         ptr += snprintf(ptr, end-ptr, "%d:%s  ", i,
2264                                         lustre_cfg_string(lcfg, i));
2265                 }
2266         }
2267         ptr += snprintf(ptr, end - ptr, "\n");
2268         /* return consumed bytes */
2269         rc = ptr - buf;
2270         RETURN(rc);
2271 }
2272
2273 int class_config_dump_handler(const struct lu_env *env,
2274                               struct llog_handle *handle,
2275                               struct llog_rec_hdr *rec, void *data)
2276 {
2277         char *outstr;
2278         int rc = 0;
2279
2280         ENTRY;
2281
2282         OBD_ALLOC(outstr, 256);
2283         if (!outstr)
2284                 RETURN(-ENOMEM);
2285
2286         if (rec->lrh_type == OBD_CFG_REC) {
2287                 class_config_parse_rec(rec, outstr, 256);
2288                 LCONSOLE(D_WARNING, "   %s\n", outstr);
2289         } else {
2290                 LCONSOLE(D_WARNING, "unhandled lrh_type: %#x\n", rec->lrh_type);
2291                 rc = -EINVAL;
2292         }
2293
2294         OBD_FREE(outstr, 256);
2295         RETURN(rc);
2296 }
2297
2298 /**
2299  * Call class_cleanup and class_detach.
2300  * "Manual" only in the sense that we're faking lcfg commands.
2301  */
2302 int class_manual_cleanup(struct obd_device *obd)
2303 {
2304         char flags[3] = "";
2305         struct lustre_cfg *lcfg;
2306         struct lustre_cfg_bufs bufs;
2307         int rc;
2308
2309         ENTRY;
2310
2311         if (!obd) {
2312                 CERROR("empty cleanup\n");
2313                 RETURN(-EALREADY);
2314         }
2315
2316         if (obd->obd_force)
2317                 strlcat(flags, "F", sizeof(flags));
2318         if (obd->obd_fail)
2319                 strlcat(flags, "A", sizeof(flags));
2320
2321         CDEBUG(D_CONFIG, "Manual cleanup of %s (flags='%s')\n",
2322                obd->obd_name, flags);
2323
2324         lustre_cfg_bufs_reset(&bufs, obd->obd_name);
2325         lustre_cfg_bufs_set_string(&bufs, 1, flags);
2326         OBD_ALLOC(lcfg, lustre_cfg_len(bufs.lcfg_bufcount, bufs.lcfg_buflen));
2327         if (!lcfg)
2328                 RETURN(-ENOMEM);
2329         lustre_cfg_init(lcfg, LCFG_CLEANUP, &bufs);
2330
2331         rc = class_process_config(lcfg);
2332         if (rc) {
2333                 CERROR("cleanup failed %d: %s\n", rc, obd->obd_name);
2334                 GOTO(out, rc);
2335         }
2336
2337         /* the lcfg is almost the same for both ops */
2338         lcfg->lcfg_command = LCFG_DETACH;
2339         rc = class_process_config(lcfg);
2340         if (rc)
2341                 CERROR("detach failed %d: %s\n", rc, obd->obd_name);
2342 out:
2343         OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens));
2344         RETURN(rc);
2345 }
2346 EXPORT_SYMBOL(class_manual_cleanup);
2347
2348 #ifdef HAVE_SERVER_SUPPORT
2349 /*
2350  * nid<->nidstats hash operations
2351  */
2352 static unsigned
2353 nidstats_hash(struct cfs_hash *hs, const void *key, unsigned int mask)
2354 {
2355         return cfs_hash_djb2_hash(key, sizeof(lnet_nid_t), mask);
2356 }
2357
2358 static void *
2359 nidstats_key(struct hlist_node *hnode)
2360 {
2361         struct nid_stat *ns;
2362
2363         ns = hlist_entry(hnode, struct nid_stat, nid_hash);
2364
2365         return &ns->nid;
2366 }
2367
2368 static int
2369 nidstats_keycmp(const void *key, struct hlist_node *hnode)
2370 {
2371         return *(lnet_nid_t *)nidstats_key(hnode) == *(lnet_nid_t *)key;
2372 }
2373
2374 static void *
2375 nidstats_object(struct hlist_node *hnode)
2376 {
2377         return hlist_entry(hnode, struct nid_stat, nid_hash);
2378 }
2379
2380 static void
2381 nidstats_get(struct cfs_hash *hs, struct hlist_node *hnode)
2382 {
2383         struct nid_stat *ns;
2384
2385         ns = hlist_entry(hnode, struct nid_stat, nid_hash);
2386         nidstat_getref(ns);
2387 }
2388
2389 static void
2390 nidstats_put_locked(struct cfs_hash *hs, struct hlist_node *hnode)
2391 {
2392         struct nid_stat *ns;
2393
2394         ns = hlist_entry(hnode, struct nid_stat, nid_hash);
2395         nidstat_putref(ns);
2396 }
2397
2398 static struct cfs_hash_ops nid_stat_hash_ops = {
2399         .hs_hash        = nidstats_hash,
2400         .hs_key         = nidstats_key,
2401         .hs_keycmp      = nidstats_keycmp,
2402         .hs_object      = nidstats_object,
2403         .hs_get         = nidstats_get,
2404         .hs_put_locked  = nidstats_put_locked,
2405 };
2406
2407
2408 /*
2409  * client_generation<->export hash operations
2410  */
2411
2412 static unsigned
2413 gen_hash(struct cfs_hash *hs, const void *key, unsigned mask)
2414 {
2415         return cfs_hash_djb2_hash(key, sizeof(__u32), mask);
2416 }
2417
2418 static void *
2419 gen_key(struct hlist_node *hnode)
2420 {
2421         struct obd_export *exp;
2422
2423         exp = hlist_entry(hnode, struct obd_export, exp_gen_hash);
2424
2425         RETURN(&exp->exp_target_data.ted_lcd->lcd_generation);
2426 }
2427
2428 /*
2429  * NOTE: It is impossible to find an export that is in failed
2430  *       state with this function
2431  */
2432 static int
2433 gen_kepcmp(const void *key, struct hlist_node *hnode)
2434 {
2435         struct obd_export *exp;
2436
2437         LASSERT(key);
2438         exp = hlist_entry(hnode, struct obd_export, exp_gen_hash);
2439
2440         RETURN(exp->exp_target_data.ted_lcd->lcd_generation == *(__u32 *)key &&
2441                !exp->exp_failed);
2442 }
2443
2444 static void *
2445 gen_export_object(struct hlist_node *hnode)
2446 {
2447         return hlist_entry(hnode, struct obd_export, exp_gen_hash);
2448 }
2449
2450 static void
2451 gen_export_get(struct cfs_hash *hs, struct hlist_node *hnode)
2452 {
2453         struct obd_export *exp;
2454
2455         exp = hlist_entry(hnode, struct obd_export, exp_gen_hash);
2456         class_export_get(exp);
2457 }
2458
2459 static void
2460 gen_export_put_locked(struct cfs_hash *hs, struct hlist_node *hnode)
2461 {
2462         struct obd_export *exp;
2463
2464         exp = hlist_entry(hnode, struct obd_export, exp_gen_hash);
2465         class_export_put(exp);
2466 }
2467
2468 static struct cfs_hash_ops gen_hash_ops = {
2469         .hs_hash        = gen_hash,
2470         .hs_key         = gen_key,
2471         .hs_keycmp      = gen_kepcmp,
2472         .hs_object      = gen_export_object,
2473         .hs_get         = gen_export_get,
2474         .hs_put_locked  = gen_export_put_locked,
2475 };
2476
2477 #endif /* HAVE_SERVER_SUPPORT */