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[fs/lustre-release.git] / lustre / lov / lov_obd.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.sun.com/software/products/lustre/docs/GPLv2.pdf
19  *
20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21  * CA 95054 USA or visit www.sun.com if you need additional information or
22  * have any questions.
23  *
24  * GPL HEADER END
25  */
26 /*
27  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
28  * Use is subject to license terms.
29  *
30  * Copyright (c) 2011, 2014, Intel Corporation.
31  */
32 /*
33  * This file is part of Lustre, http://www.lustre.org/
34  * Lustre is a trademark of Sun Microsystems, Inc.
35  *
36  * lustre/lov/lov_obd.c
37  *
38  * Author: Phil Schwan <phil@clusterfs.com>
39  * Author: Peter Braam <braam@clusterfs.com>
40  * Author: Mike Shaver <shaver@clusterfs.com>
41  * Author: Nathan Rutman <nathan@clusterfs.com>
42  */
43
44 #define DEBUG_SUBSYSTEM S_LOV
45 #include <libcfs/libcfs.h>
46
47 #include <obd_support.h>
48 #include <lustre_ioctl.h>
49 #include <lustre_lib.h>
50 #include <lustre_net.h>
51 #include <lustre/lustre_idl.h>
52 #include <lustre_dlm.h>
53 #include <lustre_mds.h>
54 #include <obd_class.h>
55 #include <lprocfs_status.h>
56 #include <lustre_param.h>
57 #include <cl_object.h>
58 #include <lustre_fid.h>
59
60 #include "lov_internal.h"
61
62 /* Keep a refcount of lov->tgt usage to prevent racing with addition/deletion.
63    Any function that expects lov_tgts to remain stationary must take a ref. */
64 static void lov_getref(struct obd_device *obd)
65 {
66         struct lov_obd *lov = &obd->u.lov;
67
68         /* nobody gets through here until lov_putref is done */
69         mutex_lock(&lov->lov_lock);
70         atomic_inc(&lov->lov_refcount);
71         mutex_unlock(&lov->lov_lock);
72         return;
73 }
74
75 static void __lov_del_obd(struct obd_device *obd, struct lov_tgt_desc *tgt);
76
77 static void lov_putref(struct obd_device *obd)
78 {
79         struct lov_obd *lov = &obd->u.lov;
80
81         mutex_lock(&lov->lov_lock);
82         /* ok to dec to 0 more than once -- ltd_exp's will be null */
83         if (atomic_dec_and_test(&lov->lov_refcount) && lov->lov_death_row) {
84                 struct list_head kill = LIST_HEAD_INIT(kill);
85                 struct lov_tgt_desc *tgt, *n;
86                 int i;
87
88                 CDEBUG(D_CONFIG, "destroying %d lov targets\n",
89                        lov->lov_death_row);
90                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
91                         tgt = lov->lov_tgts[i];
92
93                         if (!tgt || !tgt->ltd_reap)
94                                 continue;
95                         list_add(&tgt->ltd_kill, &kill);
96                         /* XXX - right now there is a dependency on ld_tgt_count
97                          * being the maximum tgt index for computing the
98                          * mds_max_easize. So we can't shrink it. */
99                         lov_ost_pool_remove(&lov->lov_packed, i);
100                         lov->lov_tgts[i] = NULL;
101                         lov->lov_death_row--;
102                 }
103                 mutex_unlock(&lov->lov_lock);
104
105                 list_for_each_entry_safe(tgt, n, &kill, ltd_kill) {
106                         list_del(&tgt->ltd_kill);
107                         /* Disconnect */
108                         __lov_del_obd(obd, tgt);
109                 }
110         } else {
111                 mutex_unlock(&lov->lov_lock);
112         }
113 }
114
115 static int lov_set_osc_active(struct obd_device *obd, struct obd_uuid *uuid,
116                               enum obd_notify_event ev);
117 static int lov_notify(struct obd_device *obd, struct obd_device *watched,
118                       enum obd_notify_event ev, void *data);
119
120 int lov_connect_obd(struct obd_device *obd, __u32 index, int activate,
121                     struct obd_connect_data *data)
122 {
123         struct lov_obd *lov = &obd->u.lov;
124         struct obd_uuid *tgt_uuid;
125         struct obd_device *tgt_obd;
126         static struct obd_uuid lov_osc_uuid = { "LOV_OSC_UUID" };
127         struct obd_import *imp;
128         int rc;
129         ENTRY;
130
131         if (lov->lov_tgts[index] == NULL)
132                 RETURN(-EINVAL);
133
134         tgt_uuid = &lov->lov_tgts[index]->ltd_uuid;
135         tgt_obd = lov->lov_tgts[index]->ltd_obd;
136
137         if (!tgt_obd->obd_set_up) {
138                 CERROR("Target %s not set up\n", obd_uuid2str(tgt_uuid));
139                 RETURN(-EINVAL);
140         }
141
142         /* override the sp_me from lov */
143         tgt_obd->u.cli.cl_sp_me = lov->lov_sp_me;
144
145         if (data && (data->ocd_connect_flags & OBD_CONNECT_INDEX))
146                 data->ocd_index = index;
147
148         /*
149          * Divine LOV knows that OBDs under it are OSCs.
150          */
151         imp = tgt_obd->u.cli.cl_import;
152
153         if (activate) {
154                 tgt_obd->obd_no_recov = 0;
155                 /* FIXME this is probably supposed to be
156                    ptlrpc_set_import_active.  Horrible naming. */
157                 ptlrpc_activate_import(imp);
158         }
159
160         rc = obd_register_observer(tgt_obd, obd);
161         if (rc) {
162                 CERROR("Target %s register_observer error %d\n",
163                        obd_uuid2str(tgt_uuid), rc);
164                 RETURN(rc);
165         }
166
167
168         if (imp->imp_invalid) {
169                 CDEBUG(D_CONFIG, "not connecting OSC %s; administratively "
170                        "disabled\n", obd_uuid2str(tgt_uuid));
171                 RETURN(0);
172         }
173
174         rc = obd_connect(NULL, &lov->lov_tgts[index]->ltd_exp, tgt_obd,
175                          &lov_osc_uuid, data, NULL);
176         if (rc || !lov->lov_tgts[index]->ltd_exp) {
177                 CERROR("Target %s connect error %d\n",
178                        obd_uuid2str(tgt_uuid), rc);
179                 RETURN(-ENODEV);
180         }
181
182         lov->lov_tgts[index]->ltd_reap = 0;
183
184         CDEBUG(D_CONFIG, "Connected tgt idx %d %s (%s) %sactive\n", index,
185                obd_uuid2str(tgt_uuid), tgt_obd->obd_name, activate ? "":"in");
186
187         if (lov->targets_proc_entry != NULL) {
188                 struct proc_dir_entry *osc_symlink;
189                 struct obd_device *osc_obd;
190
191                 osc_obd = lov->lov_tgts[index]->ltd_exp->exp_obd;
192
193                 LASSERT(osc_obd != NULL);
194                 LASSERT(osc_obd->obd_magic == OBD_DEVICE_MAGIC);
195                 LASSERT(osc_obd->obd_type->typ_name != NULL);
196
197                 osc_symlink = lprocfs_add_symlink(osc_obd->obd_name,
198                                                   lov->targets_proc_entry,
199                                                   "../../../%s/%s",
200                                                   osc_obd->obd_type->typ_name,
201                                                   osc_obd->obd_name);
202                 if (osc_symlink == NULL) {
203                         CERROR("cannot register LOV target "
204                                "/proc/fs/lustre/%s/%s/target_obds/%s\n",
205                                obd->obd_type->typ_name, obd->obd_name,
206                                osc_obd->obd_name);
207                 }
208         }
209         RETURN(0);
210 }
211
212 static int lov_connect(const struct lu_env *env,
213                        struct obd_export **exp, struct obd_device *obd,
214                        struct obd_uuid *cluuid, struct obd_connect_data *data,
215                        void *localdata)
216 {
217         struct lov_obd *lov = &obd->u.lov;
218         struct lov_tgt_desc *tgt;
219         struct lustre_handle conn;
220         int i, rc;
221         ENTRY;
222
223         CDEBUG(D_CONFIG, "connect #%d\n", lov->lov_connects);
224
225         rc = class_connect(&conn, obd, cluuid);
226         if (rc)
227                 RETURN(rc);
228
229         *exp = class_conn2export(&conn);
230
231         /* Why should there ever be more than 1 connect? */
232         lov->lov_connects++;
233         LASSERT(lov->lov_connects == 1);
234
235         memset(&lov->lov_ocd, 0, sizeof(lov->lov_ocd));
236         if (data)
237                 lov->lov_ocd = *data;
238
239         lov->targets_proc_entry = lprocfs_register("target_obds",
240                                                    obd->obd_proc_entry,
241                                                    NULL, NULL);
242         if (IS_ERR(lov->targets_proc_entry)) {
243                 CERROR("%s: cannot register "
244                        "/proc/fs/lustre/%s/%s/target_obds\n",
245                        obd->obd_name, obd->obd_type->typ_name, obd->obd_name);
246                 lov->targets_proc_entry = NULL;
247         }
248
249         obd_getref(obd);
250         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
251                 tgt = lov->lov_tgts[i];
252                 if (!tgt || obd_uuid_empty(&tgt->ltd_uuid))
253                         continue;
254                 /* Flags will be lowest common denominator */
255                 rc = lov_connect_obd(obd, i, tgt->ltd_activate, &lov->lov_ocd);
256                 if (rc) {
257                         CERROR("%s: lov connect tgt %d failed: %d\n",
258                                obd->obd_name, i, rc);
259                         continue;
260                 }
261                 /* connect to administrative disabled ost */
262                 if (!lov->lov_tgts[i]->ltd_exp)
263                         continue;
264
265                 rc = lov_notify(obd, lov->lov_tgts[i]->ltd_exp->exp_obd,
266                                 OBD_NOTIFY_CONNECT, (void *)&i);
267                 if (rc) {
268                         CERROR("%s error sending notify %d\n",
269                                obd->obd_name, rc);
270                 }
271         }
272         obd_putref(obd);
273
274         RETURN(0);
275 }
276
277 static int lov_disconnect_obd(struct obd_device *obd, struct lov_tgt_desc *tgt)
278 {
279         struct lov_obd *lov = &obd->u.lov;
280         struct obd_device *osc_obd;
281         int rc;
282         ENTRY;
283
284         osc_obd = class_exp2obd(tgt->ltd_exp);
285         CDEBUG(D_CONFIG, "%s: disconnecting target %s\n",
286                obd->obd_name, osc_obd->obd_name);
287
288         if (tgt->ltd_active) {
289                 tgt->ltd_active = 0;
290                 lov->desc.ld_active_tgt_count--;
291                 tgt->ltd_exp->exp_obd->obd_inactive = 1;
292         }
293
294         if (osc_obd) {
295                 /* Pass it on to our clients.
296                  * XXX This should be an argument to disconnect,
297                  * XXX not a back-door flag on the OBD.  Ah well.
298                  */
299                 osc_obd->obd_force = obd->obd_force;
300                 osc_obd->obd_fail = obd->obd_fail;
301                 osc_obd->obd_no_recov = obd->obd_no_recov;
302
303                 if (lov->targets_proc_entry != NULL)
304                         lprocfs_remove_proc_entry(osc_obd->obd_name,
305                                                   lov->targets_proc_entry);
306         }
307
308         obd_register_observer(osc_obd, NULL);
309
310         rc = obd_disconnect(tgt->ltd_exp);
311         if (rc) {
312                 CERROR("Target %s disconnect error %d\n",
313                        tgt->ltd_uuid.uuid, rc);
314                 rc = 0;
315         }
316
317         tgt->ltd_exp = NULL;
318         RETURN(0);
319 }
320
321 static int lov_disconnect(struct obd_export *exp)
322 {
323         struct obd_device *obd = class_exp2obd(exp);
324         struct lov_obd *lov = &obd->u.lov;
325         int i, rc;
326         ENTRY;
327
328         if (!lov->lov_tgts)
329                 goto out;
330
331         /* Only disconnect the underlying layers on the final disconnect. */
332         lov->lov_connects--;
333         if (lov->lov_connects != 0) {
334                 /* why should there be more than 1 connect? */
335                 CERROR("disconnect #%d\n", lov->lov_connects);
336                 goto out;
337         }
338
339         /* Let's hold another reference so lov_del_obd doesn't spin through
340            putref every time */
341         obd_getref(obd);
342
343         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
344                 if (lov->lov_tgts[i] && lov->lov_tgts[i]->ltd_exp) {
345                         /* Disconnection is the last we know about an obd */
346                         lov_del_target(obd, i, NULL, lov->lov_tgts[i]->ltd_gen);
347                 }
348         }
349         obd_putref(obd);
350
351         if (lov->targets_proc_entry != NULL)
352                 lprocfs_remove(&lov->targets_proc_entry);
353
354 out:
355         rc = class_disconnect(exp); /* bz 9811 */
356         RETURN(rc);
357 }
358
359 /* Error codes:
360  *
361  *  -EINVAL  : UUID can't be found in the LOV's target list
362  *  -ENOTCONN: The UUID is found, but the target connection is bad (!)
363  *  -EBADF   : The UUID is found, but the OBD is the wrong type (!)
364  *  any >= 0 : is log target index
365  */
366 static int lov_set_osc_active(struct obd_device *obd, struct obd_uuid *uuid,
367                               enum obd_notify_event ev)
368 {
369         struct lov_obd *lov = &obd->u.lov;
370         struct lov_tgt_desc *tgt;
371         int index, activate, active;
372         ENTRY;
373
374         CDEBUG(D_INFO, "Searching in lov %p for uuid %s event(%d)\n",
375                lov, uuid->uuid, ev);
376
377         obd_getref(obd);
378         for (index = 0; index < lov->desc.ld_tgt_count; index++) {
379                 tgt = lov->lov_tgts[index];
380                 if (!tgt)
381                         continue;
382                 /*
383                  * LU-642, initially inactive OSC could miss the obd_connect,
384                  * we make up for it here.
385                  */
386                 if (ev == OBD_NOTIFY_ACTIVATE && tgt->ltd_exp == NULL &&
387                     obd_uuid_equals(uuid, &tgt->ltd_uuid)) {
388                         struct obd_uuid lov_osc_uuid = {"LOV_OSC_UUID"};
389
390                         obd_connect(NULL, &tgt->ltd_exp, tgt->ltd_obd,
391                                     &lov_osc_uuid, &lov->lov_ocd, NULL);
392                 }
393                 if (!tgt->ltd_exp)
394                         continue;
395
396                 CDEBUG(D_INFO, "lov idx %d is %s conn "LPX64"\n",
397                        index, obd_uuid2str(&tgt->ltd_uuid),
398                        tgt->ltd_exp->exp_handle.h_cookie);
399                 if (obd_uuid_equals(uuid, &tgt->ltd_uuid))
400                         break;
401         }
402
403         if (index == lov->desc.ld_tgt_count)
404                 GOTO(out, index = -EINVAL);
405
406         if (ev == OBD_NOTIFY_DEACTIVATE || ev == OBD_NOTIFY_ACTIVATE) {
407                 activate = (ev == OBD_NOTIFY_ACTIVATE) ? 1 : 0;
408
409                 if (lov->lov_tgts[index]->ltd_activate == activate) {
410                         CDEBUG(D_INFO, "OSC %s already %sactivate!\n",
411                                uuid->uuid, activate ? "" : "de");
412                 } else {
413                         lov->lov_tgts[index]->ltd_activate = activate;
414                         CDEBUG(D_CONFIG, "%sactivate OSC %s\n",
415                                activate ? "" : "de", obd_uuid2str(uuid));
416                 }
417
418         } else if (ev == OBD_NOTIFY_INACTIVE || ev == OBD_NOTIFY_ACTIVE) {
419                 active = (ev == OBD_NOTIFY_ACTIVE) ? 1 : 0;
420
421                 if (lov->lov_tgts[index]->ltd_active == active) {
422                         CDEBUG(D_INFO, "OSC %s already %sactive!\n",
423                                uuid->uuid, active ? "" : "in");
424                         GOTO(out, index);
425                 } else {
426                         CDEBUG(D_CONFIG, "Marking OSC %s %sactive\n",
427                                obd_uuid2str(uuid), active ? "" : "in");
428                 }
429
430                 lov->lov_tgts[index]->ltd_active = active;
431                 if (active) {
432                         lov->desc.ld_active_tgt_count++;
433                         lov->lov_tgts[index]->ltd_exp->exp_obd->obd_inactive = 0;
434                 } else {
435                         lov->desc.ld_active_tgt_count--;
436                         lov->lov_tgts[index]->ltd_exp->exp_obd->obd_inactive = 1;
437                 }
438         } else {
439                 CERROR("%s: unknown event %d for uuid %s\n", obd->obd_name,
440                        ev, uuid->uuid);
441         }
442
443  out:
444         obd_putref(obd);
445         RETURN(index);
446 }
447
448 static int lov_notify(struct obd_device *obd, struct obd_device *watched,
449                       enum obd_notify_event ev, void *data)
450 {
451         int rc = 0;
452         struct lov_obd *lov = &obd->u.lov;
453         ENTRY;
454
455         down_read(&lov->lov_notify_lock);
456         if (!lov->lov_connects) {
457                 up_read(&lov->lov_notify_lock);
458                 RETURN(rc);
459         }
460
461         if (ev == OBD_NOTIFY_ACTIVE || ev == OBD_NOTIFY_INACTIVE ||
462             ev == OBD_NOTIFY_ACTIVATE || ev == OBD_NOTIFY_DEACTIVATE) {
463                 struct obd_uuid *uuid;
464
465                 LASSERT(watched);
466
467                 if (strcmp(watched->obd_type->typ_name, LUSTRE_OSC_NAME)) {
468                         up_read(&lov->lov_notify_lock);
469                         CERROR("unexpected notification of %s %s!\n",
470                                watched->obd_type->typ_name,
471                                watched->obd_name);
472                         RETURN(-EINVAL);
473                 }
474                 uuid = &watched->u.cli.cl_target_uuid;
475
476                 /* Set OSC as active before notifying the observer, so the
477                  * observer can use the OSC normally.
478                  */
479                 rc = lov_set_osc_active(obd, uuid, ev);
480                 if (rc < 0) {
481                         up_read(&lov->lov_notify_lock);
482                         CERROR("event(%d) of %s failed: %d\n", ev,
483                                obd_uuid2str(uuid), rc);
484                         RETURN(rc);
485                 }
486                 /* active event should be pass lov target index as data */
487                 data = &rc;
488         }
489
490         /* Pass the notification up the chain. */
491         if (watched) {
492                 rc = obd_notify_observer(obd, watched, ev, data);
493         } else {
494                 /* NULL watched means all osc's in the lov (only for syncs) */
495                 /* sync event should be send lov idx as data */
496                 struct lov_obd *lov = &obd->u.lov;
497                 int i, is_sync;
498
499                 data = &i;
500                 is_sync = (ev == OBD_NOTIFY_SYNC) ||
501                           (ev == OBD_NOTIFY_SYNC_NONBLOCK);
502
503                 obd_getref(obd);
504                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
505                         if (!lov->lov_tgts[i])
506                                 continue;
507
508                         /* don't send sync event if target not
509                          * connected/activated */
510                         if (is_sync &&  !lov->lov_tgts[i]->ltd_active)
511                                 continue;
512
513                         rc = obd_notify_observer(obd, lov->lov_tgts[i]->ltd_obd,
514                                                  ev, data);
515                         if (rc) {
516                                 CERROR("%s: notify %s of %s failed %d\n",
517                                        obd->obd_name,
518                                        obd->obd_observer->obd_name,
519                                        lov->lov_tgts[i]->ltd_obd->obd_name,
520                                        rc);
521                         }
522                 }
523                 obd_putref(obd);
524         }
525
526         up_read(&lov->lov_notify_lock);
527         RETURN(rc);
528 }
529
530 static int lov_add_target(struct obd_device *obd, struct obd_uuid *uuidp,
531                           __u32 index, int gen, int active)
532 {
533         struct lov_obd *lov = &obd->u.lov;
534         struct lov_tgt_desc *tgt;
535         struct obd_device *tgt_obd;
536         int rc;
537         ENTRY;
538
539         CDEBUG(D_CONFIG, "uuid:%s idx:%d gen:%d active:%d\n",
540                uuidp->uuid, index, gen, active);
541
542         if (gen <= 0) {
543                 CERROR("request to add OBD %s with invalid generation: %d\n",
544                        uuidp->uuid, gen);
545                 RETURN(-EINVAL);
546         }
547
548         tgt_obd = class_find_client_obd(uuidp, LUSTRE_OSC_NAME,
549                                         &obd->obd_uuid);
550         if (tgt_obd == NULL)
551                 RETURN(-EINVAL);
552
553         mutex_lock(&lov->lov_lock);
554
555         if ((index < lov->lov_tgt_size) && (lov->lov_tgts[index] != NULL)) {
556                 tgt = lov->lov_tgts[index];
557                 CERROR("UUID %s already assigned at LOV target index %d\n",
558                        obd_uuid2str(&tgt->ltd_uuid), index);
559                 mutex_unlock(&lov->lov_lock);
560                 RETURN(-EEXIST);
561         }
562
563         if (index >= lov->lov_tgt_size) {
564                 /* We need to reallocate the lov target array. */
565                 struct lov_tgt_desc **newtgts, **old = NULL;
566                 __u32 newsize, oldsize = 0;
567
568                 newsize = max(lov->lov_tgt_size, (__u32)2);
569                 while (newsize < index + 1)
570                         newsize = newsize << 1;
571                 OBD_ALLOC(newtgts, sizeof(*newtgts) * newsize);
572                 if (newtgts == NULL) {
573                         mutex_unlock(&lov->lov_lock);
574                         RETURN(-ENOMEM);
575                 }
576
577                 if (lov->lov_tgt_size) {
578                         memcpy(newtgts, lov->lov_tgts, sizeof(*newtgts) *
579                                lov->lov_tgt_size);
580                         old = lov->lov_tgts;
581                         oldsize = lov->lov_tgt_size;
582                 }
583
584                 lov->lov_tgts = newtgts;
585                 lov->lov_tgt_size = newsize;
586                 smp_rmb();
587                 if (old)
588                         OBD_FREE(old, sizeof(*old) * oldsize);
589
590                 CDEBUG(D_CONFIG, "tgts: %p size: %d\n",
591                        lov->lov_tgts, lov->lov_tgt_size);
592         }
593
594         OBD_ALLOC_PTR(tgt);
595         if (!tgt) {
596                 mutex_unlock(&lov->lov_lock);
597                 RETURN(-ENOMEM);
598         }
599
600         rc = lov_ost_pool_add(&lov->lov_packed, index, lov->lov_tgt_size);
601         if (rc) {
602                 mutex_unlock(&lov->lov_lock);
603                 OBD_FREE_PTR(tgt);
604                 RETURN(rc);
605         }
606
607         tgt->ltd_uuid = *uuidp;
608         tgt->ltd_obd = tgt_obd;
609         /* XXX - add a sanity check on the generation number. */
610         tgt->ltd_gen = gen;
611         tgt->ltd_index = index;
612         tgt->ltd_activate = active;
613         lov->lov_tgts[index] = tgt;
614         if (index >= lov->desc.ld_tgt_count)
615                 lov->desc.ld_tgt_count = index + 1;
616
617         mutex_unlock(&lov->lov_lock);
618
619         CDEBUG(D_CONFIG, "idx=%d ltd_gen=%d ld_tgt_count=%d\n",
620                 index, tgt->ltd_gen, lov->desc.ld_tgt_count);
621
622         rc = obd_notify(obd, tgt_obd, OBD_NOTIFY_CREATE, &index);
623
624         if (lov->lov_connects == 0) {
625                 /* lov_connect hasn't been called yet. We'll do the
626                    lov_connect_obd on this target when that fn first runs,
627                    because we don't know the connect flags yet. */
628                 RETURN(0);
629         }
630
631         obd_getref(obd);
632
633         rc = lov_connect_obd(obd, index, active, &lov->lov_ocd);
634         if (rc)
635                 GOTO(out, rc);
636
637         /* connect to administrative disabled ost */
638         if (!tgt->ltd_exp)
639                 GOTO(out, rc = 0);
640
641         if (lov->lov_cache != NULL) {
642                 rc = obd_set_info_async(NULL, tgt->ltd_exp,
643                                 sizeof(KEY_CACHE_SET), KEY_CACHE_SET,
644                                 sizeof(struct cl_client_cache), lov->lov_cache,
645                                 NULL);
646                 if (rc < 0)
647                         GOTO(out, rc);
648         }
649
650         rc = lov_notify(obd, tgt->ltd_exp->exp_obd,
651                         active ? OBD_NOTIFY_CONNECT : OBD_NOTIFY_INACTIVE,
652                         (void *)&index);
653
654 out:
655         if (rc) {
656                 CERROR("add failed (%d), deleting %s\n", rc,
657                        obd_uuid2str(&tgt->ltd_uuid));
658                 lov_del_target(obd, index, NULL, 0);
659         }
660         obd_putref(obd);
661         RETURN(rc);
662 }
663
664 /* Schedule a target for deletion */
665 int lov_del_target(struct obd_device *obd, __u32 index,
666                    struct obd_uuid *uuidp, int gen)
667 {
668         struct lov_obd *lov = &obd->u.lov;
669         int count = lov->desc.ld_tgt_count;
670         int rc = 0;
671         ENTRY;
672
673         if (index >= count) {
674                 CERROR("LOV target index %d >= number of LOV OBDs %d.\n",
675                        index, count);
676                 RETURN(-EINVAL);
677         }
678
679         /* to make sure there's no ongoing lov_notify() now */
680         down_write(&lov->lov_notify_lock);
681         obd_getref(obd);
682
683         if (!lov->lov_tgts[index]) {
684                 CERROR("LOV target at index %d is not setup.\n", index);
685                 GOTO(out, rc = -EINVAL);
686         }
687
688         if (uuidp && !obd_uuid_equals(uuidp, &lov->lov_tgts[index]->ltd_uuid)) {
689                 CERROR("LOV target UUID %s at index %d doesn't match %s.\n",
690                        lov_uuid2str(lov, index), index,
691                        obd_uuid2str(uuidp));
692                 GOTO(out, rc = -EINVAL);
693         }
694
695         CDEBUG(D_CONFIG, "uuid: %s idx: %d gen: %d exp: %p active: %d\n",
696                lov_uuid2str(lov, index), index,
697                lov->lov_tgts[index]->ltd_gen, lov->lov_tgts[index]->ltd_exp,
698                lov->lov_tgts[index]->ltd_active);
699
700         lov->lov_tgts[index]->ltd_reap = 1;
701         lov->lov_death_row++;
702         /* we really delete it from obd_putref */
703 out:
704         obd_putref(obd);
705         up_write(&lov->lov_notify_lock);
706
707         RETURN(rc);
708 }
709
710 static void __lov_del_obd(struct obd_device *obd, struct lov_tgt_desc *tgt)
711 {
712         struct obd_device *osc_obd;
713
714         LASSERT(tgt);
715         LASSERT(tgt->ltd_reap);
716
717         osc_obd = class_exp2obd(tgt->ltd_exp);
718
719         CDEBUG(D_CONFIG, "Removing tgt %s : %s\n",
720                tgt->ltd_uuid.uuid,
721                osc_obd ? osc_obd->obd_name : "<no obd>");
722
723         if (tgt->ltd_exp)
724                 lov_disconnect_obd(obd, tgt);
725
726         OBD_FREE_PTR(tgt);
727
728         /* Manual cleanup - no cleanup logs to clean up the osc's.  We must
729            do it ourselves. And we can't do it from lov_cleanup,
730            because we just lost our only reference to it. */
731         if (osc_obd)
732                 class_manual_cleanup(osc_obd);
733 }
734
735 void lov_fix_desc_stripe_size(__u64 *val)
736 {
737         if (*val < LOV_MIN_STRIPE_SIZE) {
738                 if (*val != 0)
739                         LCONSOLE_INFO("Increasing default stripe size to "
740                                       "minimum %u\n",
741                                       LOV_DESC_STRIPE_SIZE_DEFAULT);
742                 *val = LOV_DESC_STRIPE_SIZE_DEFAULT;
743         } else if (*val & (LOV_MIN_STRIPE_SIZE - 1)) {
744                 *val &= ~(LOV_MIN_STRIPE_SIZE - 1);
745                 LCONSOLE_WARN("Changing default stripe size to "LPU64" (a "
746                               "multiple of %u)\n",
747                               *val, LOV_MIN_STRIPE_SIZE);
748         }
749 }
750
751 void lov_fix_desc_stripe_count(__u32 *val)
752 {
753         if (*val == 0)
754                 *val = 1;
755 }
756
757 void lov_fix_desc_pattern(__u32 *val)
758 {
759         /* from lov_setstripe */
760         if ((*val != 0) && (*val != LOV_PATTERN_RAID0)) {
761                 LCONSOLE_WARN("Unknown stripe pattern: %#x\n", *val);
762                 *val = 0;
763         }
764 }
765
766 void lov_fix_desc_qos_maxage(__u32 *val)
767 {
768         if (*val == 0)
769                 *val = LOV_DESC_QOS_MAXAGE_DEFAULT;
770 }
771
772 void lov_fix_desc(struct lov_desc *desc)
773 {
774         lov_fix_desc_stripe_size(&desc->ld_default_stripe_size);
775         lov_fix_desc_stripe_count(&desc->ld_default_stripe_count);
776         lov_fix_desc_pattern(&desc->ld_pattern);
777         lov_fix_desc_qos_maxage(&desc->ld_qos_maxage);
778 }
779
780 int lov_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
781 {
782         struct lov_desc *desc;
783         struct lov_obd *lov = &obd->u.lov;
784 #ifdef CONFIG_PROC_FS
785         struct obd_type *type;
786 #endif
787         int rc;
788         ENTRY;
789
790         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
791                 CERROR("LOV setup requires a descriptor\n");
792                 RETURN(-EINVAL);
793         }
794
795         desc = (struct lov_desc *)lustre_cfg_buf(lcfg, 1);
796
797         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
798                 CERROR("descriptor size wrong: %d > %d\n",
799                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
800                 RETURN(-EINVAL);
801         }
802
803         if (desc->ld_magic != LOV_DESC_MAGIC) {
804                 if (desc->ld_magic == __swab32(LOV_DESC_MAGIC)) {
805                             CDEBUG(D_OTHER, "%s: Swabbing lov desc %p\n",
806                                    obd->obd_name, desc);
807                             lustre_swab_lov_desc(desc);
808                 } else {
809                         CERROR("%s: Bad lov desc magic: %#x\n",
810                                obd->obd_name, desc->ld_magic);
811                         RETURN(-EINVAL);
812                 }
813         }
814
815         lov_fix_desc(desc);
816
817         desc->ld_active_tgt_count = 0;
818         lov->desc = *desc;
819         lov->lov_tgt_size = 0;
820
821         mutex_init(&lov->lov_lock);
822         atomic_set(&lov->lov_refcount, 0);
823         lov->lov_sp_me = LUSTRE_SP_CLI;
824
825         init_rwsem(&lov->lov_notify_lock);
826
827         lov->lov_pools_hash_body = cfs_hash_create("POOLS", HASH_POOLS_CUR_BITS,
828                                                    HASH_POOLS_MAX_BITS,
829                                                    HASH_POOLS_BKT_BITS, 0,
830                                                    CFS_HASH_MIN_THETA,
831                                                    CFS_HASH_MAX_THETA,
832                                                    &pool_hash_operations,
833                                                    CFS_HASH_DEFAULT);
834         INIT_LIST_HEAD(&lov->lov_pool_list);
835         lov->lov_pool_count = 0;
836         rc = lov_ost_pool_init(&lov->lov_packed, 0);
837         if (rc)
838                 GOTO(out, rc);
839
840 #ifdef CONFIG_PROC_FS
841         obd->obd_vars = lprocfs_lov_obd_vars;
842         /* If this is true then both client (lov) and server
843          * (lod) are on the same node. The lod layer if loaded
844          * first will register the lov proc directory. In that
845          * case obd->obd_type->typ_procroot will be not set.
846          * Instead we use type->typ_procsym as the parent. */
847         type = class_search_type(LUSTRE_LOD_NAME);
848         if (type != NULL && type->typ_procsym != NULL) {
849                 obd->obd_proc_entry = lprocfs_register(obd->obd_name,
850                                                        type->typ_procsym,
851                                                        obd->obd_vars, obd);
852                 if (IS_ERR(obd->obd_proc_entry)) {
853                         rc = PTR_ERR(obd->obd_proc_entry);
854                         CERROR("error %d setting up lprocfs for %s\n", rc,
855                                obd->obd_name);
856                         obd->obd_proc_entry = NULL;
857                 }
858         } else {
859                 rc = lprocfs_obd_setup(obd);
860         }
861
862         if (rc == 0) {
863                 rc = lprocfs_seq_create(obd->obd_proc_entry, "target_obd",
864                                         0444, &lov_proc_target_fops, obd);
865                 if (rc)
866                         CWARN("Error adding the target_obd file\n");
867
868                 lov->lov_pool_proc_entry = lprocfs_register("pools",
869                                                             obd->obd_proc_entry,
870                                                             NULL, NULL);
871                 if (IS_ERR(lov->lov_pool_proc_entry)) {
872                         rc = PTR_ERR(lov->lov_pool_proc_entry);
873                         CERROR("error %d setting up lprocfs for pools\n", rc);
874                         lov->lov_pool_proc_entry = NULL;
875                 }
876         }
877 #endif
878         RETURN(0);
879
880 out:
881         return rc;
882 }
883
884 static int lov_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
885 {
886         int rc = 0;
887         struct lov_obd *lov = &obd->u.lov;
888
889         ENTRY;
890
891         switch (stage) {
892         case OBD_CLEANUP_EARLY: {
893                 int i;
894                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
895                         if (!lov->lov_tgts[i] || !lov->lov_tgts[i]->ltd_active)
896                                 continue;
897                         obd_precleanup(class_exp2obd(lov->lov_tgts[i]->ltd_exp),
898                                        OBD_CLEANUP_EARLY);
899                 }
900                 break;
901         }
902         default:
903                 break;
904         }
905
906         RETURN(rc);
907 }
908
909 static int lov_cleanup(struct obd_device *obd)
910 {
911         struct lov_obd *lov = &obd->u.lov;
912         struct list_head *pos, *tmp;
913         struct pool_desc *pool;
914         ENTRY;
915
916         list_for_each_safe(pos, tmp, &lov->lov_pool_list) {
917                 pool = list_entry(pos, struct pool_desc, pool_list);
918                 /* free pool structs */
919                 CDEBUG(D_INFO, "delete pool %p\n", pool);
920                 /* In the function below, .hs_keycmp resolves to
921                  * pool_hashkey_keycmp() */
922                 /* coverity[overrun-buffer-val] */
923                 lov_pool_del(obd, pool->pool_name);
924         }
925         cfs_hash_putref(lov->lov_pools_hash_body);
926         lov_ost_pool_free(&lov->lov_packed);
927
928         lprocfs_obd_cleanup(obd);
929         if (lov->lov_tgts) {
930                 int i;
931                 obd_getref(obd);
932                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
933                         if (!lov->lov_tgts[i])
934                                 continue;
935
936                         /* Inactive targets may never have connected */
937                         if (lov->lov_tgts[i]->ltd_active ||
938                             atomic_read(&lov->lov_refcount))
939                                 /* We should never get here - these
940                                  * should have been removed in the
941                                  * disconnect. */
942                                 CERROR("%s: lov tgt %d not cleaned! "
943                                        "deathrow=%d, lovrc=%d\n",
944                                        obd->obd_name, i, lov->lov_death_row,
945                                        atomic_read(&lov->lov_refcount));
946                         lov_del_target(obd, i, NULL, 0);
947                 }
948                 obd_putref(obd);
949                 OBD_FREE(lov->lov_tgts, sizeof(*lov->lov_tgts) *
950                          lov->lov_tgt_size);
951                 lov->lov_tgt_size = 0;
952         }
953
954         if (lov->lov_cache != NULL) {
955                 cl_cache_decref(lov->lov_cache);
956                 lov->lov_cache = NULL;
957         }
958
959         RETURN(0);
960 }
961
962 int lov_process_config_base(struct obd_device *obd, struct lustre_cfg *lcfg,
963                             __u32 *indexp, int *genp)
964 {
965         struct obd_uuid obd_uuid;
966         int cmd;
967         int rc = 0;
968         ENTRY;
969
970         switch(cmd = lcfg->lcfg_command) {
971         case LCFG_LOV_ADD_OBD:
972         case LCFG_LOV_ADD_INA:
973         case LCFG_LOV_DEL_OBD: {
974                 __u32 index;
975                 int gen;
976                 /* lov_modify_tgts add  0:lov_mdsA  1:ost1_UUID  2:0  3:1 */
977                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(obd_uuid.uuid))
978                         GOTO(out, rc = -EINVAL);
979
980                 obd_str2uuid(&obd_uuid,  lustre_cfg_buf(lcfg, 1));
981
982                 if (sscanf(lustre_cfg_buf(lcfg, 2), "%u", indexp) != 1)
983                         GOTO(out, rc = -EINVAL);
984                 if (sscanf(lustre_cfg_buf(lcfg, 3), "%d", genp) != 1)
985                         GOTO(out, rc = -EINVAL);
986                 index = *indexp;
987                 gen = *genp;
988                 if (cmd == LCFG_LOV_ADD_OBD)
989                         rc = lov_add_target(obd, &obd_uuid, index, gen, 1);
990                 else if (cmd == LCFG_LOV_ADD_INA)
991                         rc = lov_add_target(obd, &obd_uuid, index, gen, 0);
992                 else
993                         rc = lov_del_target(obd, index, &obd_uuid, gen);
994                 GOTO(out, rc);
995         }
996         case LCFG_PARAM: {
997                 struct lov_desc *desc = &(obd->u.lov.desc);
998
999                 if (!desc)
1000                         GOTO(out, rc = -EINVAL);
1001
1002                 rc = class_process_proc_param(PARAM_LOV, obd->obd_vars,
1003                                               lcfg, obd);
1004                 if (rc > 0)
1005                         rc = 0;
1006                 GOTO(out, rc);
1007         }
1008         case LCFG_POOL_NEW:
1009         case LCFG_POOL_ADD:
1010         case LCFG_POOL_DEL:
1011         case LCFG_POOL_REM:
1012                 GOTO(out, rc);
1013
1014         default: {
1015                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1016                 GOTO(out, rc = -EINVAL);
1017
1018         }
1019         }
1020 out:
1021         RETURN(rc);
1022 }
1023
1024 #define ASSERT_LSM_MAGIC(lsmp)                                                  \
1025 do {                                                                            \
1026         LASSERT((lsmp) != NULL);                                                \
1027         LASSERTF(((lsmp)->lsm_magic == LOV_MAGIC_V1 ||                          \
1028                  (lsmp)->lsm_magic == LOV_MAGIC_V3),                            \
1029                  "%p->lsm_magic=%x\n", (lsmp), (lsmp)->lsm_magic);              \
1030 } while (0)
1031
1032 int lov_statfs_interpret(struct ptlrpc_request_set *rqset, void *data, int rc)
1033 {
1034         struct lov_request_set *lovset = (struct lov_request_set *)data;
1035         int err;
1036         ENTRY;
1037
1038         if (rc)
1039                 atomic_set(&lovset->set_completes, 0);
1040
1041         err = lov_fini_statfs_set(lovset);
1042         RETURN(rc ? rc : err);
1043 }
1044
1045 static int lov_statfs_async(struct obd_export *exp, struct obd_info *oinfo,
1046                             __u64 max_age, struct ptlrpc_request_set *rqset)
1047 {
1048         struct obd_device      *obd = class_exp2obd(exp);
1049         struct lov_request_set *set;
1050         struct lov_request *req;
1051         struct list_head *pos;
1052         struct lov_obd *lov;
1053         int rc = 0;
1054         ENTRY;
1055
1056         LASSERT(oinfo != NULL);
1057         LASSERT(oinfo->oi_osfs != NULL);
1058
1059         lov = &obd->u.lov;
1060         rc = lov_prep_statfs_set(obd, oinfo, &set);
1061         if (rc)
1062                 RETURN(rc);
1063
1064         list_for_each(pos, &set->set_list) {
1065                 req = list_entry(pos, struct lov_request, rq_link);
1066                 rc = obd_statfs_async(lov->lov_tgts[req->rq_idx]->ltd_exp,
1067                                       &req->rq_oi, max_age, rqset);
1068                 if (rc)
1069                         break;
1070         }
1071
1072         if (rc || list_empty(&rqset->set_requests)) {
1073                 int err;
1074                 if (rc)
1075                         atomic_set(&set->set_completes, 0);
1076                 err = lov_fini_statfs_set(set);
1077                 RETURN(rc ? rc : err);
1078         }
1079
1080         LASSERT(rqset->set_interpret == NULL);
1081         rqset->set_interpret = lov_statfs_interpret;
1082         rqset->set_arg = (void *)set;
1083         RETURN(0);
1084 }
1085
1086 static int lov_statfs(const struct lu_env *env, struct obd_export *exp,
1087                       struct obd_statfs *osfs, __u64 max_age, __u32 flags)
1088 {
1089         struct ptlrpc_request_set *set = NULL;
1090         struct obd_info oinfo = { { { 0 } } };
1091         int rc = 0;
1092         ENTRY;
1093
1094
1095         /* for obdclass we forbid using obd_statfs_rqset, but prefer using async
1096          * statfs requests */
1097         set = ptlrpc_prep_set();
1098         if (set == NULL)
1099                 RETURN(-ENOMEM);
1100
1101         oinfo.oi_osfs = osfs;
1102         oinfo.oi_flags = flags;
1103         rc = lov_statfs_async(exp, &oinfo, max_age, set);
1104         if (rc == 0)
1105                 rc = ptlrpc_set_wait(set);
1106         ptlrpc_set_destroy(set);
1107
1108         RETURN(rc);
1109 }
1110
1111 static int lov_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
1112                          void *karg, void __user *uarg)
1113 {
1114         struct obd_device *obddev = class_exp2obd(exp);
1115         struct lov_obd *lov = &obddev->u.lov;
1116         int i = 0, rc = 0, count = lov->desc.ld_tgt_count;
1117         struct obd_uuid *uuidp;
1118         ENTRY;
1119
1120         switch (cmd) {
1121         case IOC_OBD_STATFS: {
1122                 struct obd_ioctl_data *data = karg;
1123                 struct obd_device *osc_obd;
1124                 struct obd_statfs stat_buf = {0};
1125                 __u32 index;
1126                 __u32 flags;
1127
1128                 memcpy(&index, data->ioc_inlbuf2, sizeof(__u32));
1129                 if ((index >= count))
1130                         RETURN(-ENODEV);
1131
1132                 if (!lov->lov_tgts[index])
1133                         /* Try again with the next index */
1134                         RETURN(-EAGAIN);
1135                 if (!lov->lov_tgts[index]->ltd_active)
1136                         RETURN(-ENODATA);
1137
1138                 osc_obd = class_exp2obd(lov->lov_tgts[index]->ltd_exp);
1139                 if (!osc_obd)
1140                         RETURN(-EINVAL);
1141
1142                 /* copy UUID */
1143                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(osc_obd),
1144                                  min_t(unsigned long, data->ioc_plen2,
1145                                        sizeof(struct obd_uuid))))
1146                         RETURN(-EFAULT);
1147
1148                 flags = uarg ? *(__u32 __user *)uarg : 0;
1149                 /* got statfs data */
1150                 rc = obd_statfs(NULL, lov->lov_tgts[index]->ltd_exp, &stat_buf,
1151                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
1152                                 flags);
1153                 if (rc)
1154                         RETURN(rc);
1155                 if (copy_to_user(data->ioc_pbuf1, &stat_buf,
1156                                  min_t(unsigned long, data->ioc_plen1,
1157                                        sizeof(struct obd_statfs))))
1158                         RETURN(-EFAULT);
1159                 break;
1160         }
1161         case OBD_IOC_LOV_GET_CONFIG: {
1162                 struct obd_ioctl_data *data;
1163                 struct lov_desc *desc;
1164                 char *buf = NULL;
1165                 __u32 *genp;
1166
1167                 len = 0;
1168                 if (obd_ioctl_getdata(&buf, &len, uarg))
1169                         RETURN(-EINVAL);
1170
1171                 data = (struct obd_ioctl_data *)buf;
1172
1173                 if (sizeof(*desc) > data->ioc_inllen1) {
1174                         obd_ioctl_freedata(buf, len);
1175                         RETURN(-EINVAL);
1176                 }
1177
1178                 if (sizeof(uuidp->uuid) * count > data->ioc_inllen2) {
1179                         obd_ioctl_freedata(buf, len);
1180                         RETURN(-EINVAL);
1181                 }
1182
1183                 if (sizeof(__u32) * count > data->ioc_inllen3) {
1184                         obd_ioctl_freedata(buf, len);
1185                         RETURN(-EINVAL);
1186                 }
1187
1188                 desc = (struct lov_desc *)data->ioc_inlbuf1;
1189                 memcpy(desc, &(lov->desc), sizeof(*desc));
1190
1191                 uuidp = (struct obd_uuid *)data->ioc_inlbuf2;
1192                 genp = (__u32 *)data->ioc_inlbuf3;
1193                 /* the uuid will be empty for deleted OSTs */
1194                 for (i = 0; i < count; i++, uuidp++, genp++) {
1195                         if (!lov->lov_tgts[i])
1196                                 continue;
1197                         *uuidp = lov->lov_tgts[i]->ltd_uuid;
1198                         *genp = lov->lov_tgts[i]->ltd_gen;
1199                 }
1200
1201                 if (copy_to_user(uarg, buf, len))
1202                         rc = -EFAULT;
1203                 obd_ioctl_freedata(buf, len);
1204                 break;
1205         }
1206         case OBD_IOC_QUOTACTL: {
1207                 struct if_quotactl *qctl = karg;
1208                 struct lov_tgt_desc *tgt = NULL;
1209                 struct obd_quotactl *oqctl;
1210
1211                 if (qctl->qc_valid == QC_OSTIDX) {
1212                         if (count <= qctl->qc_idx)
1213                                 RETURN(-EINVAL);
1214
1215                         tgt = lov->lov_tgts[qctl->qc_idx];
1216                         if (!tgt || !tgt->ltd_exp)
1217                                 RETURN(-EINVAL);
1218                 } else if (qctl->qc_valid == QC_UUID) {
1219                         for (i = 0; i < count; i++) {
1220                                 tgt = lov->lov_tgts[i];
1221                                 if (!tgt ||
1222                                     !obd_uuid_equals(&tgt->ltd_uuid,
1223                                                      &qctl->obd_uuid))
1224                                         continue;
1225
1226                                 if (tgt->ltd_exp == NULL)
1227                                         RETURN(-EINVAL);
1228
1229                                 break;
1230                         }
1231                 } else {
1232                         RETURN(-EINVAL);
1233                 }
1234
1235                 if (i >= count)
1236                         RETURN(-EAGAIN);
1237
1238                 LASSERT(tgt && tgt->ltd_exp);
1239                 OBD_ALLOC_PTR(oqctl);
1240                 if (!oqctl)
1241                         RETURN(-ENOMEM);
1242
1243                 QCTL_COPY(oqctl, qctl);
1244                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
1245                 if (rc == 0) {
1246                         QCTL_COPY(qctl, oqctl);
1247                         qctl->qc_valid = QC_OSTIDX;
1248                         qctl->obd_uuid = tgt->ltd_uuid;
1249                 }
1250                 OBD_FREE_PTR(oqctl);
1251                 break;
1252         }
1253         default: {
1254                 int set = 0;
1255
1256                 if (count == 0)
1257                         RETURN(-ENOTTY);
1258
1259                 for (i = 0; i < count; i++) {
1260                         int err;
1261                         struct obd_device *osc_obd;
1262
1263                         /* OST was disconnected */
1264                         if (!lov->lov_tgts[i] || !lov->lov_tgts[i]->ltd_exp)
1265                                 continue;
1266
1267                         /* ll_umount_begin() sets force flag but for lov, not
1268                          * osc. Let's pass it through */
1269                         osc_obd = class_exp2obd(lov->lov_tgts[i]->ltd_exp);
1270                         osc_obd->obd_force = obddev->obd_force;
1271                         err = obd_iocontrol(cmd, lov->lov_tgts[i]->ltd_exp,
1272                                             len, karg, uarg);
1273                         if (err) {
1274                                 if (lov->lov_tgts[i]->ltd_active) {
1275                                         CDEBUG(err == -ENOTTY ?
1276                                                D_IOCTL : D_WARNING,
1277                                                "iocontrol OSC %s on OST "
1278                                                "idx %d cmd %x: err = %d\n",
1279                                                lov_uuid2str(lov, i),
1280                                                i, cmd, err);
1281                                         if (!rc)
1282                                                 rc = err;
1283                                 }
1284                         } else {
1285                                 set = 1;
1286                         }
1287                 }
1288                 if (!set && !rc)
1289                         rc = -EIO;
1290         }
1291         }
1292
1293         RETURN(rc);
1294 }
1295
1296 static int lov_get_info(const struct lu_env *env, struct obd_export *exp,
1297                         __u32 keylen, void *key, __u32 *vallen, void *val)
1298 {
1299         struct obd_device *obddev = class_exp2obd(exp);
1300         struct lov_obd *lov = &obddev->u.lov;
1301         struct lov_desc *ld = &lov->desc;
1302         int rc = 0;
1303         ENTRY;
1304
1305         if (vallen == NULL || val == NULL)
1306                 RETURN(-EFAULT);
1307
1308         obd_getref(obddev);
1309
1310         if (KEY_IS(KEY_MAX_EASIZE)) {
1311                 u32 max_stripe_count = min_t(u32, ld->ld_active_tgt_count,
1312                                              LOV_MAX_STRIPE_COUNT);
1313
1314                 *((u32 *)val) = lov_mds_md_size(max_stripe_count, LOV_MAGIC_V3);
1315         } else if (KEY_IS(KEY_DEFAULT_EASIZE)) {
1316                 u32 def_stripe_count = min_t(u32, ld->ld_default_stripe_count,
1317                                              LOV_MAX_STRIPE_COUNT);
1318
1319                 *((u32 *)val) = lov_mds_md_size(def_stripe_count, LOV_MAGIC_V3);
1320         } else if (KEY_IS(KEY_TGT_COUNT)) {
1321                 *((int *)val) = lov->desc.ld_tgt_count;
1322         } else {
1323                 rc = -EINVAL;
1324         }
1325
1326         obd_putref(obddev);
1327
1328         RETURN(rc);
1329 }
1330
1331 static int lov_set_info_async(const struct lu_env *env, struct obd_export *exp,
1332                               __u32 keylen, void *key,
1333                               __u32 vallen, void *val,
1334                               struct ptlrpc_request_set *set)
1335 {
1336         struct obd_device *obddev = class_exp2obd(exp);
1337         struct lov_obd *lov = &obddev->u.lov;
1338         struct lov_tgt_desc *tgt;
1339         int do_inactive = 0;
1340         int no_set = 0;
1341         u32 count;
1342         u32 i;
1343         int rc = 0;
1344         int err;
1345         ENTRY;
1346
1347         if (set == NULL) {
1348                 no_set = 1;
1349                 set = ptlrpc_prep_set();
1350                 if (!set)
1351                         RETURN(-ENOMEM);
1352         }
1353
1354         obd_getref(obddev);
1355         count = lov->desc.ld_tgt_count;
1356
1357         if (KEY_IS(KEY_CHECKSUM)) {
1358                 do_inactive = 1;
1359         } else if (KEY_IS(KEY_CACHE_SET)) {
1360                 LASSERT(lov->lov_cache == NULL);
1361                 lov->lov_cache = val;
1362                 do_inactive = 1;
1363                 cl_cache_incref(lov->lov_cache);
1364         }
1365
1366         for (i = 0; i < count; i++) {
1367                 tgt = lov->lov_tgts[i];
1368
1369                 /* OST was disconnected */
1370                 if (!tgt || !tgt->ltd_exp)
1371                         continue;
1372
1373                 /* OST is inactive and we don't want inactive OSCs */
1374                 if (!tgt->ltd_active && !do_inactive)
1375                         continue;
1376
1377                 err = obd_set_info_async(env, tgt->ltd_exp, keylen, key,
1378                                          vallen, val, set);
1379                 if (!rc)
1380                         rc = err;
1381         }
1382
1383         obd_putref(obddev);
1384         if (no_set) {
1385                 err = ptlrpc_set_wait(set);
1386                 if (!rc)
1387                         rc = err;
1388                 ptlrpc_set_destroy(set);
1389         }
1390         RETURN(rc);
1391 }
1392
1393 void lov_stripe_lock(struct lov_stripe_md *md)
1394 __acquires(&md->lsm_lock)
1395 {
1396         LASSERT(md->lsm_lock_owner != current_pid());
1397         spin_lock(&md->lsm_lock);
1398         LASSERT(md->lsm_lock_owner == 0);
1399         md->lsm_lock_owner = current_pid();
1400 }
1401
1402 void lov_stripe_unlock(struct lov_stripe_md *md)
1403 __releases(&md->lsm_lock)
1404 {
1405         LASSERT(md->lsm_lock_owner == current_pid());
1406         md->lsm_lock_owner = 0;
1407         spin_unlock(&md->lsm_lock);
1408 }
1409
1410 static int lov_quotactl(struct obd_device *obd, struct obd_export *exp,
1411                         struct obd_quotactl *oqctl)
1412 {
1413         struct lov_obd      *lov = &obd->u.lov;
1414         struct lov_tgt_desc *tgt;
1415         __u64                curspace = 0;
1416         __u64                bhardlimit = 0;
1417         int                  i, rc = 0;
1418         ENTRY;
1419
1420         if (oqctl->qc_cmd != Q_GETOQUOTA &&
1421             oqctl->qc_cmd != LUSTRE_Q_SETQUOTA) {
1422                 CERROR("%s: bad quota opc %x for lov obd\n",
1423                        obd->obd_name, oqctl->qc_cmd);
1424                 RETURN(-EFAULT);
1425         }
1426
1427         /* for lov tgt */
1428         obd_getref(obd);
1429         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
1430                 int err;
1431
1432                 tgt = lov->lov_tgts[i];
1433
1434                 if (!tgt)
1435                         continue;
1436
1437                 if (!tgt->ltd_active || tgt->ltd_reap) {
1438                         if (oqctl->qc_cmd == Q_GETOQUOTA &&
1439                             lov->lov_tgts[i]->ltd_activate) {
1440                                 rc = -ENETDOWN;
1441                                 CERROR("ost %d is inactive\n", i);
1442                         } else {
1443                                 CDEBUG(D_HA, "ost %d is inactive\n", i);
1444                         }
1445                         continue;
1446                 }
1447
1448                 err = obd_quotactl(tgt->ltd_exp, oqctl);
1449                 if (err) {
1450                         if (tgt->ltd_active && !rc)
1451                                 rc = err;
1452                         continue;
1453                 }
1454
1455                 if (oqctl->qc_cmd == Q_GETOQUOTA) {
1456                         curspace += oqctl->qc_dqblk.dqb_curspace;
1457                         bhardlimit += oqctl->qc_dqblk.dqb_bhardlimit;
1458                 }
1459         }
1460         obd_putref(obd);
1461
1462         if (oqctl->qc_cmd == Q_GETOQUOTA) {
1463                 oqctl->qc_dqblk.dqb_curspace = curspace;
1464                 oqctl->qc_dqblk.dqb_bhardlimit = bhardlimit;
1465         }
1466         RETURN(rc);
1467 }
1468
1469 static struct obd_ops lov_obd_ops = {
1470         .o_owner                = THIS_MODULE,
1471         .o_setup                = lov_setup,
1472         .o_precleanup           = lov_precleanup,
1473         .o_cleanup              = lov_cleanup,
1474         .o_connect              = lov_connect,
1475         .o_disconnect           = lov_disconnect,
1476         .o_statfs               = lov_statfs,
1477         .o_statfs_async         = lov_statfs_async,
1478         .o_packmd               = lov_packmd,
1479         .o_unpackmd             = lov_unpackmd,
1480         .o_iocontrol            = lov_iocontrol,
1481         .o_get_info             = lov_get_info,
1482         .o_set_info_async       = lov_set_info_async,
1483         .o_notify               = lov_notify,
1484         .o_pool_new             = lov_pool_new,
1485         .o_pool_rem             = lov_pool_remove,
1486         .o_pool_add             = lov_pool_add,
1487         .o_pool_del             = lov_pool_del,
1488         .o_getref               = lov_getref,
1489         .o_putref               = lov_putref,
1490         .o_quotactl             = lov_quotactl,
1491 };
1492
1493 struct kmem_cache *lov_oinfo_slab;
1494
1495 static int __init lov_init(void)
1496 {
1497         bool enable_proc = true;
1498         struct obd_type *type;
1499         int rc;
1500         ENTRY;
1501
1502         /* print an address of _any_ initialized kernel symbol from this
1503          * module, to allow debugging with gdb that doesn't support data
1504          * symbols from modules.*/
1505         CDEBUG(D_INFO, "Lustre LOV module (%p).\n", &lov_caches);
1506
1507         rc = lu_kmem_init(lov_caches);
1508         if (rc)
1509                 return rc;
1510
1511         lov_oinfo_slab = kmem_cache_create("lov_oinfo",
1512                                            sizeof(struct lov_oinfo), 0,
1513                                            SLAB_HWCACHE_ALIGN, NULL);
1514         if (lov_oinfo_slab == NULL) {
1515                 lu_kmem_fini(lov_caches);
1516                 return -ENOMEM;
1517         }
1518
1519         type = class_search_type(LUSTRE_LOD_NAME);
1520         if (type != NULL && type->typ_procsym != NULL)
1521                 enable_proc = false;
1522
1523         rc = class_register_type(&lov_obd_ops, NULL, enable_proc, NULL,
1524                                  LUSTRE_LOV_NAME, &lov_device_type);
1525
1526         if (rc) {
1527                 kmem_cache_destroy(lov_oinfo_slab);
1528                 lu_kmem_fini(lov_caches);
1529         }
1530
1531         RETURN(rc);
1532 }
1533
1534 static void /*__exit*/ lov_exit(void)
1535 {
1536         class_unregister_type(LUSTRE_LOV_NAME);
1537         kmem_cache_destroy(lov_oinfo_slab);
1538         lu_kmem_fini(lov_caches);
1539 }
1540
1541 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
1542 MODULE_DESCRIPTION("Lustre Logical Object Volume OBD driver");
1543 MODULE_VERSION(LUSTRE_VERSION_STRING);
1544 MODULE_LICENSE("GPL");
1545
1546 module_init(lov_init);
1547 module_exit(lov_exit);