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[fs/lustre-release.git] / lustre / lmv / lmv_obd.c
1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2  * vim:expandtab:shiftwidth=8:tabstop=8:
3  *
4  * Copyright (C) 2002, 2003 Cluster File Systems, Inc.
5  *
6  *   This file is part of Lustre, http://www.lustre.org.
7  *
8  *   Lustre is free software; you can redistribute it and/or
9  *   modify it under the terms of version 2 of the GNU General Public
10  *   License as published by the Free Software Foundation.
11  *
12  *   Lustre is distributed in the hope that it will be useful,
13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  *   GNU General Public License for more details.
16  *
17  *   You should have received a copy of the GNU General Public License
18  *   along with Lustre; if not, write to the Free Software
19  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20  */
21
22 #ifndef EXPORT_SYMTAB
23 # define EXPORT_SYMTAB
24 #endif
25 #define DEBUG_SUBSYSTEM S_LMV
26 #ifdef __KERNEL__
27 #include <linux/slab.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/slab.h>
31 #include <linux/pagemap.h>
32 #include <asm/div64.h>
33 #include <linux/seq_file.h>
34 #else
35 #include <liblustre.h>
36 #endif
37 #include <linux/ext2_fs.h>
38
39 #include <linux/obd_support.h>
40 #include <linux/lustre_lib.h>
41 #include <linux/lustre_net.h>
42 #include <linux/lustre_idl.h>
43 #include <linux/lustre_dlm.h>
44 #include <linux/lustre_mds.h>
45 #include <linux/obd_class.h>
46 #include <linux/obd_ost.h>
47 #include <linux/lprocfs_status.h>
48 #include <linux/lustre_fsfilt.h>
49 #include <linux/obd_lmv.h>
50 #include "lmv_internal.h"
51
52 /* Error codes:
53  *
54  *  -EINVAL  : UUID can't be found in the LMV's target list
55  *  -ENOTCONN: The UUID is found, but the target connection is bad (!)
56  *  -EBADF   : The UUID is found, but the OBD of the wrong type (!)
57  */
58 static int lmv_set_mdc_active(struct lmv_obd *lmv, struct obd_uuid *uuid,
59                               int activate)
60 {
61         struct obd_device *obd;
62         struct lmv_tgt_desc *tgt;
63         int i, rc = 0;
64         ENTRY;
65
66         CDEBUG(D_INFO, "Searching in lmv %p for uuid %s (activate=%d)\n",
67                lmv, uuid->uuid, activate);
68
69         spin_lock(&lmv->lmv_lock);
70         for (i = 0, tgt = lmv->tgts; i < lmv->desc.ld_tgt_count; i++, tgt++) {
71                 if (tgt->ltd_exp == NULL)
72                         continue;
73
74                 CDEBUG(D_INFO, "lmv idx %d is %s conn "LPX64"\n",
75                        i, tgt->uuid.uuid, tgt->ltd_exp->exp_handle.h_cookie);
76                 if (strncmp(uuid->uuid, tgt->uuid.uuid, sizeof uuid->uuid) == 0)
77                         break;
78         }
79
80         if (i == lmv->desc.ld_tgt_count)
81                 GOTO(out, rc = -EINVAL);
82
83         obd = class_exp2obd(tgt->ltd_exp);
84         if (obd == NULL)
85                 GOTO(out, rc = -ENOTCONN);
86
87         CDEBUG(D_INFO, "Found OBD %s=%s device %d (%p) type %s at LMV idx %d\n",
88                obd->obd_name, obd->obd_uuid.uuid, obd->obd_minor, obd,
89                obd->obd_type->typ_name, i);
90         LASSERT(strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) == 0);
91
92         if (tgt->active == activate) {
93                 CDEBUG(D_INFO, "OBD %p already %sactive!\n", obd,
94                        activate ? "" : "in");
95                 GOTO(out, rc);
96         }
97
98         CDEBUG(D_INFO, "Marking OBD %p %sactive\n", obd, activate ? "" : "in");
99
100         tgt->active = activate;
101         if (activate)
102                 lmv->desc.ld_active_tgt_count++;
103         else
104                 lmv->desc.ld_active_tgt_count--;
105
106         EXIT;
107  out:
108         spin_unlock(&lmv->lmv_lock);
109         return rc;
110 }
111
112 static int lmv_notify(struct obd_device *obd, struct obd_device *watched,
113                       int active)
114 {
115         int rc;
116         struct obd_uuid *uuid;
117
118         if (strcmp(watched->obd_type->typ_name, LUSTRE_MDC_NAME)) {
119                 CERROR("unexpected notification of %s %s!\n",
120                        watched->obd_type->typ_name,
121                        watched->obd_name);
122                 return -EINVAL;
123         }
124         uuid = &watched->u.cli.cl_import->imp_target_uuid;
125
126         /* Set MDC as active before notifying the observer, so the
127          * observer can use the MDC normally.  
128          */
129         rc = lmv_set_mdc_active(&obd->u.lmv, uuid, active);
130         if (rc) {
131                 CERROR("%sactivation of %s failed: %d\n",
132                        active ? "" : "de", uuid->uuid, rc);
133                 RETURN(rc);
134         }
135
136         if (obd->obd_observer)
137                 /* Pass the notification up the chain. */
138                 rc = obd_notify(obd->obd_observer, watched, active);
139
140         RETURN(rc);
141 }
142
143 int lmv_attach(struct obd_device *dev, obd_count len, void *data)
144 {
145         struct lprocfs_static_vars lvars;
146         int rc;
147         ENTRY;
148
149         lprocfs_init_vars(lmv, &lvars);
150         rc = lprocfs_obd_attach(dev, lvars.obd_vars);
151         if (rc == 0) {
152 #ifdef __KERNEL__
153                 struct proc_dir_entry *entry;
154                 
155                 entry = create_proc_entry("target_obd", 0444, dev->obd_proc_entry);
156                 if (entry == NULL)
157                         RETURN(-ENOMEM);
158                 /* entry->proc_fops = &lmv_proc_target_fops; */
159                 entry->data = dev;
160 #endif
161        }
162         RETURN (rc);
163 }
164
165 int lmv_detach(struct obd_device *dev)
166 {
167         return lprocfs_obd_detach(dev);
168 }
169
170 /* This is fake connect function. Its purpose is to initialize lmv and 
171  * say caller that everything is okay. Real connection will be performed
172  * later. */
173 static int lmv_connect(struct lustre_handle *conn, struct obd_device *obd,
174                        struct obd_uuid *cluuid)
175 {
176         struct lmv_obd *lmv = &obd->u.lmv;
177         struct obd_export *exp;
178         int rc;
179         ENTRY;
180
181         rc = class_connect(conn, obd, cluuid);
182         if (rc) {
183                 CERROR("class_connection() returned %d\n", rc);
184                 RETURN(rc);
185         }
186
187         exp = class_conn2export(conn);
188         /* We don't want to actually do the underlying connections more than
189          * once, so keep track. */
190         lmv->refcount++;
191         if (lmv->refcount > 1) {
192                 class_export_put(exp);
193                 RETURN(0);
194         }
195
196         lmv->cluuid = *cluuid;
197         lmv->connected = 0;
198         lmv->exp = exp;
199
200         RETURN(0);
201 }
202
203 void lmv_set_timeouts(struct obd_device *obd)
204 {
205         struct lmv_tgt_desc *tgts;
206         struct lmv_obd *lmv;
207         int i;
208
209         lmv = &obd->u.lmv;
210         if (lmv->server_timeout == 0)
211                 return;
212
213         if (lmv->connected == 0)
214                 return;
215
216         for (i = 0, tgts = lmv->tgts; i < lmv->desc.ld_tgt_count; i++, tgts++) {
217                 if (tgts->ltd_exp == NULL)
218                         continue;
219                 obd_set_info(tgts->ltd_exp, strlen("inter_mds"),
220                              "inter_mds", 0, NULL);
221         }
222 }
223
224 /* Performs a check if passed obd is connected. If no - connect it. */
225 int lmv_check_connect(struct obd_device *obd) {
226         struct lmv_obd *lmv = &obd->u.lmv;
227         struct obd_uuid *cluuid;
228         struct lmv_tgt_desc *tgts;
229         struct obd_export *exp;
230         int rc, rc2, i;
231
232         if (lmv->connected)
233                 return 0;
234       
235         lmv->connected = 1;
236         cluuid = &lmv->cluuid;
237         exp = lmv->exp;
238         
239         CDEBUG(D_OTHER, "time to connect %s to %s\n",
240                cluuid->uuid, obd->obd_name);
241
242         for (i = 0, tgts = lmv->tgts; i < lmv->desc.ld_tgt_count; i++, tgts++) {
243                 struct obd_device *tgt_obd;
244                 struct obd_uuid lmv_osc_uuid = { "LMV_OSC_UUID" };
245                 struct lustre_handle conn = {0, };
246
247                 LASSERT(tgts != NULL);
248
249                 tgt_obd = class_find_client_obd(&tgts->uuid, LUSTRE_MDC_NAME, 
250                                                 &obd->obd_uuid);
251                 if (!tgt_obd) {
252                         CERROR("Target %s not attached\n", tgts->uuid.uuid);
253                         GOTO(out_disc, rc = -EINVAL);
254                 }
255
256                 /* for MDS: don't connect to yourself */
257                 if (obd_uuid_equals(&tgts->uuid, cluuid)) {
258                         CDEBUG(D_OTHER, "don't connect back to %s\n",
259                                cluuid->uuid);
260                         tgts->ltd_exp = NULL;
261                         continue;
262                 }
263
264                 CDEBUG(D_OTHER, "connect to %s(%s) - %s, %s FOR %s\n",
265                         tgt_obd->obd_name, tgt_obd->obd_uuid.uuid,
266                         tgts->uuid.uuid, obd->obd_uuid.uuid,
267                         cluuid->uuid);
268
269                 if (!tgt_obd->obd_set_up) {
270                         CERROR("Target %s not set up\n", tgts->uuid.uuid);
271                         GOTO(out_disc, rc = -EINVAL);
272                 }
273                 
274                 rc = obd_connect(&conn, tgt_obd, &lmv_osc_uuid);
275                 if (rc) {
276                         CERROR("Target %s connect error %d\n",
277                                 tgts->uuid.uuid, rc);
278                         GOTO(out_disc, rc);
279                 }
280                 tgts->ltd_exp = class_conn2export(&conn);
281
282                 obd_init_ea_size(tgts->ltd_exp, lmv->max_easize,
283                                  lmv->max_cookiesize);
284                 
285                 rc = obd_register_observer(tgt_obd, obd);
286                 if (rc) {
287                         CERROR("Target %s register_observer error %d\n",
288                                tgts->uuid.uuid, rc);
289                         obd_disconnect(tgts->ltd_exp, 0);
290                         GOTO(out_disc, rc);
291                 }
292
293                 lmv->desc.ld_active_tgt_count++;
294                 tgts->active = 1;
295                 
296                 CDEBUG(D_OTHER, "connected to %s(%s) successfully (%d)\n",
297                         tgt_obd->obd_name, tgt_obd->obd_uuid.uuid,
298                         atomic_read(&obd->obd_refcount));
299         }
300
301         lmv_set_timeouts(obd);
302
303         class_export_put(exp);
304         return 0;
305
306  out_disc:
307         while (i-- > 0) {
308                 struct obd_uuid uuid;
309                 --tgts;
310                 --lmv->desc.ld_active_tgt_count;
311                 tgts->active = 0;
312                 /* save for CERROR below; (we know it's terminated) */
313                 uuid = tgts->uuid;
314                 rc2 = obd_disconnect(tgts->ltd_exp, 0);
315                 if (rc2)
316                         CERROR("error: LMV target %s disconnect on MDT idx %d: "
317                                "error %d\n", uuid.uuid, i, rc2);
318         }
319         class_disconnect(exp, 0);
320         RETURN (rc);
321 }
322
323 static int lmv_disconnect(struct obd_export *exp, int flags)
324 {
325         struct obd_device *obd = class_exp2obd(exp);
326         struct lmv_obd *lmv = &obd->u.lmv;
327         int rc, i;
328         ENTRY;
329
330         if (!lmv->tgts)
331                 goto out_local;
332
333         /* Only disconnect the underlying layers on the final disconnect. */
334         lmv->refcount--;
335         if (lmv->refcount != 0)
336                 goto out_local;
337
338         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
339                 if (lmv->tgts[i].ltd_exp == NULL)
340                         continue;
341
342                 if (obd->obd_no_recov) {
343                         /* Pass it on to our clients.
344                          * XXX This should be an argument to disconnect,
345                          * XXX not a back-door flag on the OBD.  Ah well.
346                          */
347                         struct obd_device *mdc_obd;
348                         mdc_obd = class_exp2obd(lmv->tgts[i].ltd_exp);
349                         if (mdc_obd)
350                                 mdc_obd->obd_no_recov = 1;
351                 }
352
353                 CDEBUG(D_OTHER, "disconnected from %s(%s) successfully\n",
354                         lmv->tgts[i].ltd_exp->exp_obd->obd_name,
355                         lmv->tgts[i].ltd_exp->exp_obd->obd_uuid.uuid);
356
357                 obd_register_observer(lmv->tgts[i].ltd_exp->exp_obd, NULL);
358
359                 rc = obd_disconnect(lmv->tgts[i].ltd_exp, flags);
360                 if (rc) {
361                         if (lmv->tgts[i].active) {
362                                 CERROR("Target %s disconnect error %d\n",
363                                        lmv->tgts[i].uuid.uuid, rc);
364                         }
365                         rc = 0;
366                 }
367                 if (lmv->tgts[i].active) {
368                         lmv->desc.ld_active_tgt_count--;
369                         lmv->tgts[i].active = 0;
370                 }
371                 lmv->tgts[i].ltd_exp = NULL;
372         }
373
374 out_local:
375         /* this is the case when no real connection is established by
376          * lmv_check_connect(). */
377         if (!lmv->connected)
378                 class_export_put(exp);
379         rc = class_disconnect(exp, 0);
380         RETURN(rc);
381 }
382
383 static int lmv_iocontrol(unsigned int cmd, struct obd_export *exp,
384                          int len, void *karg, void *uarg)
385 {
386         struct obd_device *obddev = class_exp2obd(exp);
387         struct lmv_obd *lmv = &obddev->u.lmv;
388         int i, rc = 0, set = 0;
389
390         ENTRY;
391
392         if (lmv->desc.ld_tgt_count == 0)
393                 RETURN(-ENOTTY);
394         
395         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
396                 int err;
397
398                 err = obd_iocontrol(cmd, lmv->tgts[i].ltd_exp,
399                                     len, karg, uarg);
400                 if (err) {
401                         if (lmv->tgts[i].active) {
402                                 CERROR("error: iocontrol MDC %s on MDT"
403                                        "idx %d: err = %d\n",
404                                        lmv->tgts[i].uuid.uuid, i, err);
405                                 if (!rc)
406                                         rc = err;
407                         }
408                 } else
409                         set = 1;
410         }
411         if (!set && !rc)
412                 rc = -EIO;
413
414         RETURN(rc);
415 }
416
417 static int lmv_setup(struct obd_device *obd, obd_count len, void *buf)
418 {
419         int i, rc = 0;
420         struct lmv_desc *desc;
421         struct obd_uuid *uuids;
422         struct lmv_tgt_desc *tgts;
423         struct lustre_cfg *lcfg = buf;
424         struct lmv_obd *lmv = &obd->u.lmv;
425         ENTRY;
426
427         if (lcfg->lcfg_inllen1 < 1) {
428                 CERROR("LMV setup requires a descriptor\n");
429                 RETURN(-EINVAL);
430         }
431
432         if (lcfg->lcfg_inllen2 < 1) {
433                 CERROR("LMV setup requires an OST UUID list\n");
434                 RETURN(-EINVAL);
435         }
436
437         desc = (struct lmv_desc *)lcfg->lcfg_inlbuf1;
438         if (sizeof(*desc) > lcfg->lcfg_inllen1) {
439                 CERROR("descriptor size wrong: %d > %d\n",
440                        (int)sizeof(*desc), lcfg->lcfg_inllen1);
441                 RETURN(-EINVAL);
442         }
443
444         uuids = (struct obd_uuid *)lcfg->lcfg_inlbuf2;
445         if (sizeof(*uuids) * desc->ld_tgt_count != lcfg->lcfg_inllen2) {
446                 CERROR("UUID array size wrong: %u * %u != %u\n",
447                        sizeof(*uuids), desc->ld_tgt_count, lcfg->lcfg_inllen2);
448                 RETURN(-EINVAL);
449         }
450
451         lmv->bufsize = sizeof(struct lmv_tgt_desc) * desc->ld_tgt_count;
452         OBD_ALLOC(lmv->tgts, lmv->bufsize);
453         if (lmv->tgts == NULL) {
454                 CERROR("Out of memory\n");
455                 RETURN(-ENOMEM);
456         }
457
458         lmv->desc = *desc;
459         spin_lock_init(&lmv->lmv_lock);
460         
461         for (i = 0, tgts = lmv->tgts; i < desc->ld_tgt_count; i++, tgts++)
462                 tgts->uuid = uuids[i];
463         
464         lmv->max_cookiesize = 0;
465
466         lmv->max_easize = sizeof(struct ll_fid) *
467                 desc->ld_tgt_count + sizeof(struct mea);
468         
469         rc = lmv_setup_mgr(obd);
470         if (rc) {
471                 CERROR("Can't setup LMV object manager, "
472                        "error %d.\n", rc);
473                 OBD_FREE(lmv->tgts, lmv->bufsize);
474         }
475
476         RETURN(rc);
477 }
478
479 static int lmv_statfs(struct obd_device *obd, struct obd_statfs *osfs,
480                       unsigned long max_age)
481 {
482         struct lmv_obd *lmv = &obd->u.lmv;
483         struct obd_statfs temp;
484         int rc = 0, i;
485         ENTRY;
486         
487         rc = lmv_check_connect(obd);
488         if (rc)
489                 RETURN(rc);
490                 
491         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
492                 rc = obd_statfs(lmv->tgts[i].ltd_exp->exp_obd, &temp, max_age);
493                 if (rc) {
494                         CERROR("can't stat MDS #%d (%s)\n", i,
495                                lmv->tgts[i].ltd_exp->exp_obd->obd_name);
496                         RETURN(rc);
497                 }
498                 if (i == 0) {
499                         memcpy(osfs, &temp, sizeof(temp));
500                 } else {
501                         osfs->os_bavail += temp.os_bavail;
502                         osfs->os_blocks += temp.os_blocks;
503                         osfs->os_ffree += temp.os_ffree;
504                         osfs->os_files += temp.os_files;
505                 }
506         }
507         RETURN(rc);
508 }
509
510 static int lmv_cleanup(struct obd_device *obd, int flags) 
511 {
512         struct lmv_obd *lmv = &obd->u.lmv;
513         ENTRY;
514         lmv_cleanup_mgr(obd);
515         OBD_FREE(lmv->tgts, lmv->bufsize);
516         RETURN(0);
517 }
518
519 static int lmv_getstatus(struct obd_export *exp, struct ll_fid *fid)
520 {
521         struct obd_device *obd = exp->exp_obd;
522         struct lmv_obd *lmv = &obd->u.lmv;
523         int rc;
524         ENTRY;
525         rc = lmv_check_connect(obd);
526         if (rc)
527                 RETURN(rc);
528         rc = md_getstatus(lmv->tgts[0].ltd_exp, fid);
529         fid->mds = 0;
530         RETURN(rc);
531 }
532
533 static int lmv_getattr(struct obd_export *exp, struct ll_fid *fid,
534                        unsigned long valid, unsigned int ea_size,
535                        struct ptlrpc_request **request)
536 {
537         struct obd_device *obd = exp->exp_obd;
538         struct lmv_obd *lmv = &obd->u.lmv;
539         int rc, i = fid->mds;
540         struct lmv_obj *obj;
541         ENTRY;
542
543         rc = lmv_check_connect(obd);
544         if (rc)
545                 RETURN(rc);
546
547         LASSERT(i < lmv->desc.ld_tgt_count);
548
549         rc = md_getattr(lmv->tgts[i].ltd_exp, fid, valid,
550                         ea_size, request);
551         if (rc)
552                 RETURN(rc);
553         
554         obj = lmv_grab_obj(obd, fid);
555         
556         CDEBUG(D_OTHER, "GETATTR for %lu/%lu/%lu %s\n",
557                (unsigned long)fid->mds, (unsigned long)fid->id,
558                (unsigned long)fid->generation, obj ? "(splitted)" : "");
559
560         /* if object is splitted, then we loop over all the slaves and gather
561          * size attribute. In ideal world we would have to gather also mds field
562          * from all slaves, as object is spread over the cluster and this is
563          * definitely interesting information and it is not good to loss it,
564          * but...*/
565         if (obj) {
566                 struct mds_body *body;
567
568                 if (*request == NULL) {
569                         lmv_put_obj(obj);
570                         RETURN(rc);
571                 }
572                         
573                 body = lustre_msg_buf((*request)->rq_repmsg, 0,
574                                       sizeof(*body));
575                 LASSERT(body != NULL);
576
577                 lmv_lock_obj(obj);
578         
579                 for (i = 0; i < obj->objcount; i++) {
580
581                         /* skip master obj. */
582                         if (fid_equal(&obj->fid, &obj->objs[i].fid))
583                                 continue;
584                         
585                         body->size += obj->objs[i].size;
586                 }
587
588                 lmv_unlock_obj(obj);
589                 lmv_put_obj(obj);
590         }
591         
592         RETURN(rc);
593 }
594
595 static int lmv_change_cbdata(struct obd_export *exp, struct ll_fid *fid, 
596                              ldlm_iterator_t it, void *data)
597 {
598         struct obd_device *obd = exp->exp_obd;
599         struct lmv_obd *lmv = &obd->u.lmv;
600         int rc = 0;
601         ENTRY;
602         
603         rc = lmv_check_connect(obd);
604         if (rc)
605                 RETURN(rc);
606         
607         CDEBUG(D_OTHER, "CBDATA for %lu/%lu/%lu\n", (unsigned long)fid->mds,
608                (unsigned long)fid->id, (unsigned long)fid->generation);
609         
610         LASSERT(fid->mds < lmv->desc.ld_tgt_count);
611
612         rc = md_change_cbdata(lmv->tgts[fid->mds].ltd_exp,
613                               fid, it, data);
614         
615         RETURN(rc);
616 }
617
618 static int lmv_change_cbdata_name(struct obd_export *exp, struct ll_fid *pfid,
619                                   char *name, int len, struct ll_fid *cfid,
620                                   ldlm_iterator_t it, void *data)
621 {
622         struct obd_device *obd = exp->exp_obd;
623         struct lmv_obd *lmv = &obd->u.lmv;
624         struct lmv_obj *obj;
625         int rc = 0, mds;
626         ENTRY;
627
628         rc = lmv_check_connect(obd);
629         if (rc)
630                 RETURN(rc);
631
632         LASSERT(pfid->mds < lmv->desc.ld_tgt_count);
633         LASSERT(cfid->mds < lmv->desc.ld_tgt_count);
634         
635         CDEBUG(D_OTHER, "CBDATA for %lu/%lu/%lu:%*s -> %lu/%lu/%lu\n",
636                (unsigned long)pfid->mds, (unsigned long)pfid->id,
637                (unsigned long)pfid->generation, len, name,
638                (unsigned long)cfid->mds, (unsigned long)cfid->id,
639                (unsigned long)cfid->generation);
640
641         /* this is default mds for directory name belongs to. */
642         mds = pfid->mds;
643         obj = lmv_grab_obj(obd, pfid);
644         if (obj) {
645                 /* directory is splitted. look for right mds for this name. */
646                 mds = raw_name2idx(obj->objcount, name, len);
647                 lmv_put_obj(obj);
648         }
649         rc = md_change_cbdata(lmv->tgts[mds].ltd_exp, cfid, it, data);
650         RETURN(rc);
651 }
652
653 static int lmv_valid_attrs(struct obd_export *exp, struct ll_fid *fid) 
654 {
655         struct obd_device *obd = exp->exp_obd;
656         struct lmv_obd *lmv = &obd->u.lmv;
657         int rc = 0;
658         ENTRY;
659         rc = lmv_check_connect(obd);
660         if (rc)
661                 RETURN(rc);
662         CDEBUG(D_OTHER, "validate %lu/%lu/%lu\n", (unsigned long) fid->mds,
663                (unsigned long) fid->id, (unsigned long) fid->generation);
664         LASSERT(fid->mds < lmv->desc.ld_tgt_count);
665         rc = md_valid_attrs(lmv->tgts[fid->mds].ltd_exp, fid);
666         RETURN(rc);
667 }
668
669 int lmv_close(struct obd_export *exp, struct obdo *obdo,
670                   struct obd_client_handle *och,
671                   struct ptlrpc_request **request)
672 {
673         struct obd_device *obd = exp->exp_obd;
674         struct lmv_obd *lmv = &obd->u.lmv;
675         int rc, i = obdo->o_mds;
676         ENTRY;
677         rc = lmv_check_connect(obd);
678         if (rc)
679                 RETURN(rc);
680         LASSERT(i < lmv->desc.ld_tgt_count);
681         CDEBUG(D_OTHER, "CLOSE %lu/%lu/%lu\n", (unsigned long) obdo->o_mds,
682                (unsigned long) obdo->o_id, (unsigned long) obdo->o_generation);
683         rc = md_close(lmv->tgts[i].ltd_exp, obdo, och, request);
684         RETURN(rc);
685 }
686
687 int lmv_get_mea_and_update_object(struct obd_export *exp, struct ll_fid *fid)
688 {
689         struct obd_device *obd = exp->exp_obd;
690         struct lmv_obd *lmv = &obd->u.lmv;
691         struct ptlrpc_request *req = NULL;
692         struct lmv_obj *obj;
693         struct lustre_md md;
694         unsigned long valid;
695         int mealen, rc;
696
697         md.mea = NULL;
698         mealen = MEA_SIZE_LMV(lmv);
699         
700         valid = OBD_MD_FLEASIZE | OBD_MD_FLDIREA;
701
702         /* time to update mea of parent fid */
703         rc = md_getattr(lmv->tgts[fid->mds].ltd_exp, fid,
704                         valid, mealen, &req);
705         if (rc) {
706                 CERROR("md_getattr() failed, error %d\n", rc);
707                 GOTO(cleanup, rc);
708         }
709
710         rc = mdc_req2lustre_md(exp, req, 0, NULL, &md);
711         if (rc) {
712                 CERROR("mdc_req2lustre_md() failed, error %d\n", rc);
713                 GOTO(cleanup, rc);
714         }
715
716         if (md.mea == NULL)
717                 GOTO(cleanup, rc = -ENODATA);
718
719         obj = lmv_create_obj(exp, fid, md.mea);
720         if (IS_ERR(obj))
721                 rc = PTR_ERR(obj);
722         
723         lmv_put_obj(obj);
724         obd_free_memmd(exp, (struct lov_stripe_md **)&md.mea);
725
726 cleanup:
727         if (req)
728                 ptlrpc_req_finished(req);
729         RETURN(rc);
730 }
731
732 int lmv_create(struct obd_export *exp, struct mdc_op_data *op_data,
733                const void *data, int datalen, int mode, __u32 uid,
734                __u32 gid, __u64 rdev, struct ptlrpc_request **request)
735 {
736         struct obd_device *obd = exp->exp_obd;
737         struct lmv_obd *lmv = &obd->u.lmv;
738         struct mds_body *body;
739         struct lmv_obj *obj;
740         int rc, mds;
741         ENTRY;
742
743         rc = lmv_check_connect(obd);
744         if (rc)
745                 RETURN(rc);
746
747         if (!lmv->desc.ld_active_tgt_count)
748                 RETURN(-EIO);
749 repeat:
750         obj = lmv_grab_obj(obd, &op_data->fid1);
751         if (obj) {
752                 mds = raw_name2idx(obj->objcount, op_data->name,
753                                    op_data->namelen);
754                 op_data->fid1 = obj->objs[mds].fid;
755                 lmv_put_obj(obj);
756         }
757
758         CDEBUG(D_OTHER, "CREATE '%*s' on %lu/%lu/%lu\n", op_data->namelen,
759                op_data->name, (unsigned long)op_data->fid1.mds,
760                (unsigned long)op_data->fid1.id,
761                (unsigned long)op_data->fid1.generation);
762         
763         rc = md_create(lmv->tgts[op_data->fid1.mds].ltd_exp, op_data, data,
764                        datalen, mode, uid, gid, rdev, request);
765         if (rc == 0) {
766                 if (*request == NULL)
767                         RETURN(rc);
768
769                 body = lustre_msg_buf((*request)->rq_repmsg, 0,
770                                       sizeof(*body));
771                 LASSERT(body != NULL);
772                 
773                 CDEBUG(D_OTHER, "created. id = %lu, generation = %lu, "
774                        "mds = %d\n", (unsigned long)body->fid1.id,
775                        (unsigned long)body->fid1.generation, op_data->fid1.mds);
776                 
777                 LASSERT(body->valid & OBD_MD_MDS ||
778                         body->mds == op_data->fid1.mds);
779         } else if (rc == -ERESTART) {
780                 /* directory got splitted. time to update local object and
781                  * repeat the request with proper MDS */
782                 rc = lmv_get_mea_and_update_object(exp, &op_data->fid1);
783                 if (rc == 0) {
784                         ptlrpc_req_finished(*request);
785                         goto repeat;
786                 }
787         }
788         RETURN(rc);
789 }
790
791 int lmv_done_writing(struct obd_export *exp, struct obdo *obdo)
792 {
793         struct obd_device *obd = exp->exp_obd;
794         struct lmv_obd *lmv = &obd->u.lmv;
795         int rc;
796         ENTRY;
797         rc = lmv_check_connect(obd);
798         if (rc)
799                 RETURN(rc);
800
801         /* FIXME: choose right MDC here */
802         CWARN("this method isn't implemented yet\n");
803         rc = md_done_writing(lmv->tgts[0].ltd_exp, obdo);
804         RETURN(rc);
805 }
806
807 int lmv_enqueue_slaves(struct obd_export *exp, int locktype,
808                        struct lookup_intent *it, int lockmode,
809                        struct mdc_op_data *data, struct lustre_handle *lockh,
810                        void *lmm, int lmmsize, ldlm_completion_callback cb_completion,
811                        ldlm_blocking_callback cb_blocking, void *cb_data)
812 {
813         struct obd_device *obd = exp->exp_obd;
814         struct lmv_obd *lmv = &obd->u.lmv;
815         struct mea *mea = data->mea1;
816         struct mdc_op_data data2;
817         int i, rc, mds;
818         ENTRY;
819
820         LASSERT(mea != NULL);
821         for (i = 0; i < mea->mea_count; i++) {
822                 if (lmv->tgts[i].ltd_exp == NULL)
823                         continue;
824
825                 memset(&data2, 0, sizeof(data2));
826                 data2.fid1 = mea->mea_fids[i];
827                 mds = data2.fid1.mds;
828                 
829                 rc = md_enqueue(lmv->tgts[mds].ltd_exp, locktype, it, lockmode,
830                                 &data2, lockh + i, lmm, lmmsize, cb_completion,
831                                 cb_blocking, cb_data);
832                 
833                 CDEBUG(D_OTHER, "take lock on slave %lu/%lu/%lu -> %d/%d\n",
834                        (unsigned long)mea->mea_fids[i].mds,
835                        (unsigned long)mea->mea_fids[i].id,
836                        (unsigned long)mea->mea_fids[i].generation,
837                        rc, it->d.lustre.it_status);
838                 if (rc)
839                         GOTO(cleanup, rc);
840                 if (it->d.lustre.it_data) {
841                         struct ptlrpc_request *req;
842                         req = (struct ptlrpc_request *) it->d.lustre.it_data;
843                         ptlrpc_req_finished(req);
844                 }
845                 
846                 if (it->d.lustre.it_status)
847                         GOTO(cleanup, rc = it->d.lustre.it_status);
848         }
849         RETURN(0);
850         
851 cleanup:
852         /* drop all taken locks */
853         while (--i >= 0) {
854                 if (lockh[i].cookie)
855                         ldlm_lock_decref(lockh + i, lockmode);
856                 lockh[i].cookie = 0;
857         }
858         RETURN(rc);
859 }
860
861 int lmv_enqueue(struct obd_export *exp, int lock_type,
862                 struct lookup_intent *it, int lock_mode,
863                 struct mdc_op_data *data, struct lustre_handle *lockh,
864                 void *lmm, int lmmsize, ldlm_completion_callback cb_completion,
865                 ldlm_blocking_callback cb_blocking, void *cb_data)
866 {
867         struct obd_device *obd = exp->exp_obd;
868         struct lmv_obd *lmv = &obd->u.lmv;
869         struct lmv_obj *obj;
870         int rc, mds;
871         ENTRY;
872
873         rc = lmv_check_connect(obd);
874         if (rc)
875                 RETURN(rc);
876
877         if (it->it_op == IT_UNLINK) {
878                 rc = lmv_enqueue_slaves(exp, lock_type, it, lock_mode,
879                                         data, lockh, lmm, lmmsize,
880                                         cb_completion, cb_blocking, cb_data);
881                 RETURN(rc);
882         }
883
884         if (data->namelen) {
885                 obj = lmv_grab_obj(obd, &data->fid1);
886                 if (obj) {
887                         /* directory is splitted. look for right mds for this
888                          * name */
889                         mds = raw_name2idx(obj->objcount, (char *)data->name,
890                                            data->namelen);
891                         data->fid1 = obj->objs[mds].fid;
892                         lmv_put_obj(obj);
893                 }
894         }
895         CDEBUG(D_OTHER, "ENQUEUE '%s' on %lu/%lu\n", LL_IT2STR(it),
896                (unsigned long)data->fid1.id, (unsigned long)data->fid1.generation);
897         
898         rc = md_enqueue(lmv->tgts[data->fid1.mds].ltd_exp, lock_type, it,
899                         lock_mode, data, lockh, lmm, lmmsize, cb_completion,
900                         cb_blocking, cb_data);
901
902         RETURN(rc);
903 }
904
905 int lmv_getattr_name(struct obd_export *exp, struct ll_fid *fid,
906                      char *filename, int namelen, unsigned long valid,
907                      unsigned int ea_size, struct ptlrpc_request **request)
908 {
909         struct obd_device *obd = exp->exp_obd;
910         struct lmv_obd *lmv = &obd->u.lmv;
911         struct ll_fid rfid = *fid;
912         int rc, mds = fid->mds;
913         struct mds_body *body;
914         struct lmv_obj *obj;
915         ENTRY;
916         rc = lmv_check_connect(obd);
917         if (rc)
918                 RETURN(rc);
919 repeat:
920         obj = lmv_grab_obj(obd, fid);
921         if (obj) {
922                 /* directory is splitted. look for right mds for this name */
923                 mds = raw_name2idx(obj->objcount, filename, namelen - 1);
924                 rfid = obj->objs[mds].fid;
925                 lmv_put_obj(obj);
926         }
927         
928         CDEBUG(D_OTHER, "getattr_name for %*s on %lu/%lu/%lu -> %lu/%lu/%lu\n",
929                namelen, filename, (unsigned long)fid->mds,
930                (unsigned long)fid->id, (unsigned long)fid->generation,
931                (unsigned long)rfid.mds, (unsigned long)rfid.id,
932                (unsigned long)rfid.generation);
933
934         rc = md_getattr_name(lmv->tgts[mds].ltd_exp, &rfid, filename,
935                              namelen, valid, ea_size, request);
936         if (rc == 0) {
937                 /* this could be cross-node reference. in this case all we have
938                  * right now is mds/ino/generation triple. we'd like to find
939                  * other attributes */
940                 body = lustre_msg_buf((*request)->rq_repmsg, 0, sizeof(*body));
941                 LASSERT(body != NULL);
942                 if (body->valid & OBD_MD_MDS) {
943                         struct ptlrpc_request *req = NULL;
944                         rfid = body->fid1;
945                         CDEBUG(D_OTHER, "request attrs for %lu/%lu/%lu\n",
946                                (unsigned long) rfid.mds,
947                                (unsigned long) rfid.id,
948                                (unsigned long) rfid.generation);
949                         rc = md_getattr_name(lmv->tgts[rfid.mds].ltd_exp, &rfid,
950                                              NULL, 1, valid, ea_size, &req);
951                         ptlrpc_req_finished(*request);
952                         *request = req;
953                 }
954         } else if (rc == -ERESTART) {
955                 /* directory got splitted. time to update local object and
956                  * repeat the request with proper MDS */
957                 rc = lmv_get_mea_and_update_object(exp, &rfid);
958                 if (rc == 0) {
959                         ptlrpc_req_finished(*request);
960                         goto repeat;
961                 }
962         }
963         RETURN(rc);
964 }
965
966
967 /*
968  * llite passes fid of an target inode in data->fid1 and fid of directory in
969  * data->fid2
970  */
971 int lmv_link(struct obd_export *exp, struct mdc_op_data *data,
972              struct ptlrpc_request **request)
973 {
974         struct obd_device *obd = exp->exp_obd;
975         struct lmv_obd *lmv = &obd->u.lmv;
976         struct lmv_obj *obj;
977         int rc;
978         ENTRY;
979         
980         rc = lmv_check_connect(obd);
981         if (rc)
982                 RETURN(rc);
983
984         if (data->namelen != 0) {
985                 /* usual link request */
986                 obj = lmv_grab_obj(obd, &data->fid1);
987                 if (obj) {
988                         rc = raw_name2idx(obj->objcount, data->name,
989                                           data->namelen);
990                         data->fid1 = obj->objs[rc].fid;
991                         lmv_put_obj(obj);
992                 }
993                 
994                 CDEBUG(D_OTHER,"link %lu/%lu/%lu:%*s to %lu/%lu/%lu mds %lu\n",
995                        (unsigned long)data->fid2.mds,
996                        (unsigned long)data->fid2.id,
997                        (unsigned long)data->fid2.generation,
998                        data->namelen, data->name,
999                        (unsigned long)data->fid1.mds,
1000                        (unsigned long)data->fid1.id,
1001                        (unsigned long)data->fid1.generation,
1002                        (unsigned long)data->fid1.mds);
1003         } else {
1004                 /* request from MDS to acquire i_links for inode by fid1 */
1005                 CDEBUG(D_OTHER, "inc i_nlinks for %lu/%lu/%lu\n",
1006                        (unsigned long)data->fid1.mds,
1007                        (unsigned long)data->fid1.id,
1008                        (unsigned long)data->fid1.generation);
1009         }
1010                         
1011         rc = md_link(lmv->tgts[data->fid1.mds].ltd_exp, data, request);
1012         RETURN(rc);
1013 }
1014
1015 int lmv_rename(struct obd_export *exp, struct mdc_op_data *data,
1016                const char *old, int oldlen, const char *new, int newlen,
1017                struct ptlrpc_request **request)
1018 {
1019         struct obd_device *obd = exp->exp_obd;
1020         struct lmv_obd *lmv = &obd->u.lmv;
1021         struct lmv_obj *obj;
1022         int rc, mds;
1023         ENTRY;
1024
1025         CDEBUG(D_OTHER, "rename %*s in %lu/%lu/%lu to %*s in %lu/%lu/%lu\n",
1026                oldlen, old, (unsigned long)data->fid1.mds,
1027                (unsigned long)data->fid1.id,
1028                (unsigned long)data->fid1.generation,
1029                newlen, new, (unsigned long) data->fid2.mds,
1030                (unsigned long) data->fid2.id,
1031                (unsigned long) data->fid2.generation);
1032         
1033         if (!fid_equal(&data->fid1, &data->fid2))
1034                 CWARN("cross-node rename %lu/%lu/%lu:%*s to %lu/%lu/%lu:%*s\n",
1035                       (unsigned long)data->fid1.mds,
1036                       (unsigned long)data->fid1.id,
1037                       (unsigned long)data->fid1.generation, oldlen, old,
1038                       (unsigned long)data->fid2.mds,
1039                       (unsigned long)data->fid2.id,
1040                       (unsigned long)data->fid2.generation, newlen, new);
1041
1042         rc = lmv_check_connect(obd);
1043         if (rc)
1044                 RETURN(rc);
1045
1046         if (oldlen == 0) {
1047                 /* MDS with old dir entry is asking another MDS to create name
1048                  * there */
1049                 CDEBUG(D_OTHER,
1050                        "create %*s(%d/%d) in %lu/%lu/%lu pointing to %lu/%lu/%lu\n",
1051                        newlen, new, oldlen, newlen,
1052                        (unsigned long)data->fid2.mds,
1053                        (unsigned long)data->fid2.id,
1054                        (unsigned long)data->fid2.generation,
1055                        (unsigned long)data->fid1.mds,
1056                        (unsigned long)data->fid1.id,
1057                        (unsigned long)data->fid1.generation);
1058                 mds = data->fid2.mds;
1059                 goto request;
1060         }
1061
1062         obj = lmv_grab_obj(obd, &data->fid1);
1063         if (obj) {
1064                 /* directory is already splitted, so we have to forward request
1065                  * to the right MDS */
1066                 mds = raw_name2idx(obj->objcount, (char *)old, oldlen);
1067                 data->fid1 = obj->objs[mds].fid;
1068                 CDEBUG(D_OTHER, "forward to MDS #%u (%lu/%lu/%lu)\n", mds,
1069                        (unsigned long)obj->objs[mds].fid.mds,
1070                        (unsigned long)obj->objs[mds].fid.id,
1071                        (unsigned long)obj->objs[mds].fid.generation);
1072                 lmv_put_obj(obj);
1073         }
1074
1075         obj = lmv_grab_obj(obd, &data->fid2);
1076         if (obj) {
1077                 /* directory is already splitted, so we have to forward request
1078                  * to the right MDS */
1079                 mds = raw_name2idx(obj->objcount, (char *)new, newlen);
1080                 data->fid2 = obj->objs[mds].fid;
1081                 CDEBUG(D_OTHER, "forward to MDS #%u (%lu/%lu/%lu)\n", mds,
1082                        (unsigned long)obj->objs[mds].fid.mds,
1083                        (unsigned long)obj->objs[mds].fid.id,
1084                        (unsigned long)obj->objs[mds].fid.generation);
1085                 lmv_put_obj(obj);
1086         }
1087         
1088         mds = data->fid1.mds;
1089
1090 request:
1091         rc = md_rename(lmv->tgts[mds].ltd_exp, data, old, oldlen,
1092                        new, newlen, request); 
1093         RETURN(rc);
1094 }
1095
1096 int lmv_setattr(struct obd_export *exp, struct mdc_op_data *data,
1097                 struct iattr *iattr, void *ea, int ealen, void *ea2,
1098                 int ea2len, struct ptlrpc_request **request)
1099 {
1100         struct obd_device *obd = exp->exp_obd;
1101         struct lmv_obd *lmv = &obd->u.lmv;
1102         int rc = 0, i = data->fid1.mds;
1103         struct ptlrpc_request *req;
1104         struct mds_body *body;
1105         struct lmv_obj *obj;
1106         ENTRY;
1107
1108         rc = lmv_check_connect(obd);
1109         if (rc)
1110                 RETURN(rc);
1111
1112         obj = lmv_grab_obj(obd, &data->fid1);
1113         
1114         CDEBUG(D_OTHER, "SETATTR for %lu/%lu/%lu, valid 0x%x%s\n",
1115                (unsigned long)data->fid1.mds, (unsigned long)data->fid1.id,
1116                (unsigned long)data->fid1.generation, iattr->ia_valid,
1117                obj ? ", splitted" : "");
1118         
1119         if (obj) {
1120                 for (i = 0; i < obj->objcount; i++) {
1121                         data->fid1 = obj->objs[i].fid;
1122                         
1123                         rc = md_setattr(lmv->tgts[i].ltd_exp, data, iattr,
1124                                         ea, ealen, ea2, ea2len, &req);
1125
1126                         if (fid_equal(&obj->fid, &obj->objs[i].fid)) {
1127                                 /* this is master object and this request should
1128                                  * be returned back to llite */
1129                                 *request = req;
1130                         } else {
1131                                 ptlrpc_req_finished(req);
1132                         }
1133
1134                         if (rc)
1135                                 break;
1136                 }
1137                 lmv_put_obj(obj);
1138         } else {
1139                 LASSERT(i < lmv->desc.ld_tgt_count);
1140                 rc = md_setattr(lmv->tgts[i].ltd_exp, data, iattr, ea,
1141                                 ealen, ea2, ea2len, request); 
1142                 if (rc == 0) {
1143                         body = lustre_msg_buf((*request)->rq_repmsg, 0,
1144                                               sizeof(*body));
1145                         LASSERT(body != NULL);
1146                         LASSERT(body->mds == i);
1147                 }
1148         }
1149         RETURN(rc);
1150 }
1151
1152 int lmv_sync(struct obd_export *exp, struct ll_fid *fid,
1153              struct ptlrpc_request **request)
1154 {
1155         struct obd_device *obd = exp->exp_obd;
1156         struct lmv_obd *lmv = &obd->u.lmv;
1157         int rc;
1158         ENTRY;
1159
1160         rc = lmv_check_connect(obd);
1161         if (rc)
1162                 RETURN(rc);
1163
1164         rc = md_sync(lmv->tgts[0].ltd_exp, fid, request); 
1165         RETURN(rc);
1166 }
1167
1168 int lmv_dirobj_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
1169                             void *data, int flag)
1170 {
1171         struct lustre_handle lockh;
1172         struct lmv_obj *obj;
1173         int rc;
1174         ENTRY;
1175
1176         switch (flag) {
1177         case LDLM_CB_BLOCKING:
1178                 ldlm_lock2handle(lock, &lockh);
1179                 rc = ldlm_cli_cancel(&lockh);
1180                 if (rc < 0) {
1181                         CDEBUG(D_INODE, "ldlm_cli_cancel: %d\n", rc);
1182                         RETURN(rc);
1183                 }
1184                 break;
1185         case LDLM_CB_CANCELING:
1186                 /* time to drop cached attrs for dirobj */
1187                 obj = lock->l_ast_data;
1188                 if (obj) {
1189                         CDEBUG(D_OTHER, "cancel %s on %lu/%lu, master %lu/%lu/%lu\n",
1190                                lock->l_resource->lr_name.name[3] == 1 ? "LOOKUP" : "UPDATE",
1191                                (unsigned long)lock->l_resource->lr_name.name[0],
1192                                (unsigned long)lock->l_resource->lr_name.name[1],
1193                                (unsigned long)obj->fid.mds, (unsigned long)obj->fid.id,
1194                                (unsigned long)obj->fid.generation);
1195                         lmv_put_obj(obj);
1196                 }
1197                 break;
1198         default:
1199                 LBUG();
1200         }
1201         RETURN(0);
1202 }
1203
1204 void lmv_remove_dots(struct page *page)
1205 {
1206         char *kaddr = page_address(page);
1207         unsigned limit = PAGE_CACHE_SIZE;
1208         unsigned offs, rec_len;
1209         struct ext2_dir_entry_2 *p;
1210
1211         for (offs = 0; offs <= limit - EXT2_DIR_REC_LEN(1); offs += rec_len) {
1212                 p = (struct ext2_dir_entry_2 *)(kaddr + offs);
1213                 rec_len = le16_to_cpu(p->rec_len);
1214
1215                 if ((p->name_len == 1 && p->name[0] == '.') ||
1216                     (p->name_len == 2 && p->name[0] == '.' && p->name[1] == '.'))
1217                         p->inode = 0;
1218         }
1219 }
1220
1221 int lmv_readpage(struct obd_export *exp, struct ll_fid *mdc_fid,
1222                  __u64 offset, struct page *page,
1223                  struct ptlrpc_request **request)
1224 {
1225         struct obd_device *obd = exp->exp_obd;
1226         struct lmv_obd *lmv = &obd->u.lmv;
1227         struct ll_fid rfid = *mdc_fid;
1228         struct lmv_obj *obj;
1229         int rc, i;
1230         ENTRY;
1231
1232         rc = lmv_check_connect(obd);
1233         if (rc)
1234                 RETURN(rc);
1235
1236         LASSERT(mdc_fid->mds < lmv->desc.ld_tgt_count);
1237         CDEBUG(D_OTHER, "READPAGE at %llu from %lu/%lu/%lu\n",
1238                offset, (unsigned long) rfid.mds,
1239                (unsigned long) rfid.id,
1240                (unsigned long) rfid.generation);
1241
1242         obj = lmv_grab_obj(obd, mdc_fid);
1243         if (obj) {
1244                 lmv_lock_obj(obj);
1245
1246                 /* find dirobj containing page with requested offset. */
1247                 for (i = 0; i < obj->objcount; i++) {
1248                         if (offset < obj->objs[i].size)
1249                                 break;
1250                         offset -= obj->objs[i].size;
1251                 }
1252                 rfid = obj->objs[i].fid;
1253                 
1254                 lmv_unlock_obj(obj);
1255                 lmv_put_obj(obj);
1256                 
1257                 CDEBUG(D_OTHER, "forward to %lu/%lu/%lu with offset %lu\n",
1258                        (unsigned long)rfid.mds, (unsigned long)rfid.id,
1259                        (unsigned long)rfid.generation, (unsigned long)offset);
1260         }
1261         rc = md_readpage(lmv->tgts[rfid.mds].ltd_exp, &rfid, offset,
1262                          page, request);
1263         
1264         if (rc == 0 && !fid_equal(&rfid, mdc_fid))
1265                 /* this page isn't from master object. To avoid "." and ".." 
1266                  * duplication in directory, we have to remove them from all
1267                  * slave objects */
1268                 lmv_remove_dots(page);
1269         
1270         RETURN(rc);
1271 }
1272
1273 int lmv_unlink_slaves(struct obd_export *exp, struct mdc_op_data *data,
1274                       struct ptlrpc_request **req)
1275 {
1276         struct obd_device *obd = exp->exp_obd;
1277         struct lmv_obd *lmv = &obd->u.lmv;
1278         struct mea *mea = data->mea1;
1279         struct mdc_op_data data2;
1280         int i, rc = 0, mds;
1281         ENTRY;
1282
1283         LASSERT(mea != NULL);
1284         for (i = 0; i < mea->mea_count; i++) {
1285                 if (lmv->tgts[i].ltd_exp == NULL)
1286                         continue;
1287
1288                 memset(&data2, 0, sizeof(data2));
1289                 data2.fid1 = mea->mea_fids[i];
1290                 data2.create_mode = MDS_MODE_DONT_LOCK | S_IFDIR;
1291                 mds = data2.fid1.mds;
1292                 rc = md_unlink(lmv->tgts[mds].ltd_exp, &data2, req);
1293                 CDEBUG(D_OTHER, "unlink slave %lu/%lu/%lu -> %d\n",
1294                        (unsigned long) mea->mea_fids[i].mds,
1295                        (unsigned long) mea->mea_fids[i].id,
1296                        (unsigned long) mea->mea_fids[i].generation, rc);
1297                 if (*req) {
1298                         ptlrpc_req_finished(*req);
1299                         *req = NULL;
1300                 }
1301                 if (rc)
1302                         break;
1303         }
1304         RETURN(rc);
1305 }
1306
1307 int lmv_delete_object(struct obd_export *exp, struct ll_fid *fid)
1308 {
1309         ENTRY;
1310
1311         if (!lmv_delete_obj(exp, fid)) {
1312                 CDEBUG(D_OTHER, "Object %lu/%lu/%lu is not found.\n",
1313                        (unsigned long)fid->mds, (unsigned long)fid->id,
1314                        (unsigned long)fid->generation);
1315         }
1316         
1317         RETURN(0);
1318 }
1319
1320 int lmv_unlink(struct obd_export *exp, struct mdc_op_data *data,
1321                struct ptlrpc_request **request)
1322 {
1323         struct obd_device *obd = exp->exp_obd;
1324         struct lmv_obd *lmv = &obd->u.lmv;
1325         int rc, i = 0;
1326         ENTRY;
1327         
1328         rc = lmv_check_connect(obd);
1329         if (rc)
1330                 RETURN(rc);
1331
1332         if (data->namelen == 0 && data->mea1 != NULL) {
1333                 /* mds asks to remove slave objects */
1334                 rc = lmv_unlink_slaves(exp, data, request);
1335                 RETURN(rc);
1336         } else if (data->namelen != 0) {
1337                 struct lmv_obj *obj;
1338                 
1339                 obj = lmv_grab_obj(obd, &data->fid1);
1340                 if (obj) {
1341                         i = raw_name2idx(obj->objcount, data->name,
1342                                          data->namelen);
1343                         data->fid1 = obj->objs[i].fid;
1344                         lmv_put_obj(obj);
1345                 }
1346                 CDEBUG(D_OTHER, "unlink '%*s' in %lu/%lu/%lu -> %u\n",
1347                        data->namelen, data->name,
1348                        (unsigned long) data->fid1.mds,
1349                        (unsigned long) data->fid1.id,
1350                        (unsigned long) data->fid1.generation, i);
1351         } else {
1352                 CDEBUG(D_OTHER, "drop i_nlink on %lu/%lu/%lu\n",
1353                        (unsigned long) data->fid1.mds,
1354                        (unsigned long) data->fid1.id,
1355                        (unsigned long) data->fid1.generation);
1356         }
1357         rc = md_unlink(lmv->tgts[data->fid1.mds].ltd_exp, data, request); 
1358         RETURN(rc);
1359 }
1360
1361 struct obd_device *lmv_get_real_obd(struct obd_export *exp,
1362                                     char *name, int len)
1363 {
1364         struct obd_device *obd = exp->exp_obd;
1365         struct lmv_obd *lmv = &obd->u.lmv;
1366         int rc;
1367         ENTRY;
1368
1369         rc = lmv_check_connect(obd);
1370         if (rc)
1371                 RETURN(ERR_PTR(rc));
1372         obd = lmv->tgts[0].ltd_exp->exp_obd;
1373         EXIT;
1374         return obd;
1375 }
1376
1377 int lmv_init_ea_size(struct obd_export *exp, int easize, int cookiesize)
1378 {
1379         struct obd_device *obd = exp->exp_obd;
1380         struct lmv_obd *lmv = &obd->u.lmv;
1381         int i, rc = 0, change = 0;
1382         ENTRY;
1383
1384         if (lmv->max_easize < easize) {
1385                 lmv->max_easize = easize;
1386                 change = 1;
1387         }
1388         if (lmv->max_cookiesize < cookiesize) {
1389                 lmv->max_cookiesize = cookiesize;
1390                 change = 1;
1391         }
1392         if (change == 0)
1393                 RETURN(0);
1394         
1395         if (lmv->connected == 0)
1396                 RETURN(0);
1397
1398         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1399                 rc = obd_init_ea_size(lmv->tgts[i].ltd_exp, easize, cookiesize);
1400                 if (rc) {
1401                         CERROR("obd_init_ea_size() failed on MDT target %d, "
1402                                "error %d.\n", i, rc);
1403                         break;
1404                 }
1405         }
1406         RETURN(rc);
1407 }
1408
1409 int lmv_obd_create_single(struct obd_export *exp, struct obdo *oa,
1410                           struct lov_stripe_md **ea, struct obd_trans_info *oti)
1411 {
1412         struct obd_device *obd = exp->exp_obd;
1413         struct lmv_obd *lmv = &obd->u.lmv;
1414         struct lov_stripe_md obj_md;
1415         struct lov_stripe_md *obj_mdp = &obj_md;
1416         int rc = 0;
1417         ENTRY;
1418
1419         rc = lmv_check_connect(obd);
1420         if (rc)
1421                 RETURN(rc);
1422
1423         LASSERT(ea == NULL);
1424         LASSERT(oa->o_mds < lmv->desc.ld_tgt_count);
1425
1426         rc = obd_create(lmv->tgts[oa->o_mds].ltd_exp, oa, &obj_mdp, oti);
1427
1428         RETURN(rc);
1429 }
1430
1431 /*
1432  * to be called from MDS only
1433  */
1434 int lmv_obd_create(struct obd_export *exp, struct obdo *oa,
1435                    struct lov_stripe_md **ea, struct obd_trans_info *oti)
1436 {
1437         struct obd_device *obd = exp->exp_obd;
1438         struct lmv_obd *lmv = &obd->u.lmv;
1439         struct mea *mea;
1440         int i, c, rc = 0;
1441         struct ll_fid mfid;
1442         ENTRY;
1443
1444         rc = lmv_check_connect(obd);
1445         if (rc)
1446                 RETURN(rc);
1447
1448         LASSERT(oa != NULL);
1449         
1450         if (ea == NULL) {
1451                 rc = lmv_obd_create_single(exp, oa, NULL, oti);
1452                 RETURN(rc);
1453         }
1454
1455         if (*ea == NULL) {
1456                 rc = obd_alloc_diskmd(exp, (struct lov_mds_md **)ea);
1457                 if (rc < 0) {
1458                         CERROR("obd_alloc_diskmd() failed, error %d\n",
1459                                rc);
1460                         RETURN(rc);
1461                 }
1462                 
1463                 if (*ea == NULL)
1464                         RETURN(-EINVAL);
1465         }
1466
1467         rc = 0;
1468         mfid.id = oa->o_id;
1469         mfid.generation = oa->o_generation;
1470         
1471         mea = (struct mea *)*ea;
1472         if (!mea->mea_count || mea->mea_count > lmv->desc.ld_tgt_count)
1473                 mea->mea_count = lmv->desc.ld_tgt_count;
1474
1475         mea->mea_master = -1;
1476         
1477         for (i = 0, c = 0; c < mea->mea_count && 
1478                 i < lmv->desc.ld_tgt_count; i++) {
1479                 struct lov_stripe_md obj_md;
1480                 struct lov_stripe_md *obj_mdp = &obj_md;
1481                
1482                 if (lmv->tgts[i].ltd_exp == NULL) {
1483                         /* this is master MDS */
1484                         mea->mea_fids[c].id = mfid.id;
1485                         mea->mea_fids[c].generation = mfid.generation;
1486                         mea->mea_fids[c].mds = i;
1487                         mea->mea_master = i;
1488                         c++;
1489                         continue;
1490                 }
1491
1492                 /* "master" MDS should always be part of stripped dir, so scan
1493                    for it. */
1494                 if (mea->mea_master == -1 && c == mea->mea_count - 1)
1495                         continue;
1496
1497                 oa->o_valid = OBD_MD_FLGENER | OBD_MD_FLTYPE | OBD_MD_FLMODE
1498                         | OBD_MD_FLUID | OBD_MD_FLGID | OBD_MD_FLID;
1499
1500                 rc = obd_create(lmv->tgts[c].ltd_exp, oa, &obj_mdp, oti);
1501                 if (rc) {
1502                         CERROR("obd_create() failed on MDT target %d, "
1503                                "error %d\n", c, rc);
1504                         RETURN(rc);
1505                 }
1506
1507                 mea->mea_fids[c].id = oa->o_id;
1508                 mea->mea_fids[c].generation = oa->o_generation;
1509                 mea->mea_fids[c].mds = i;
1510                 c++;
1511                 CDEBUG(D_OTHER, "dirobj at mds %d: "LPU64"/%u\n",
1512                        i, oa->o_id, oa->o_generation);
1513                 CDEBUG(D_ERROR, "dirobj at mds %d: "LPU64"/%u\n",
1514                        i, oa->o_id, oa->o_generation);
1515         }
1516         LASSERT(c == mea->mea_count);
1517         CDEBUG(D_OTHER, "%d dirobjects created\n", (int) mea->mea_count);
1518
1519         RETURN(rc);
1520 }
1521
1522 static int lmv_get_info(struct obd_export *exp, __u32 keylen,
1523                         void *key, __u32 *vallen, void *val)
1524 {
1525         struct obd_device *obd;
1526         struct lmv_obd *lmv;
1527         ENTRY;
1528
1529         obd = class_exp2obd(exp);
1530         if (obd == NULL) {
1531                 CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",
1532                        exp->exp_handle.h_cookie);
1533                 RETURN(-EINVAL);
1534         }
1535
1536         lmv = &obd->u.lmv;
1537         if (keylen == 6 && memcmp(key, "mdsize", 6) == 0) {
1538                 __u32 *mdsize = val;
1539                 *vallen = sizeof(__u32);
1540                 *mdsize = sizeof(struct ll_fid) * lmv->desc.ld_tgt_count
1541                                 + sizeof(struct mea);
1542                 RETURN(0);
1543         } else if (keylen == 6 && memcmp(key, "mdsnum", 6) == 0) {
1544                 struct obd_uuid *cluuid = &lmv->cluuid;
1545                 struct lmv_tgt_desc *tgts;
1546                 __u32 *mdsnum = val;
1547                 int i;
1548
1549                 for (i = 0, tgts = lmv->tgts; i < lmv->desc.ld_tgt_count; i++, tgts++) {
1550                         if (obd_uuid_equals(&tgts->uuid, cluuid)) {
1551                                 *vallen = sizeof(__u32);
1552                                 *mdsnum = i;
1553                                 RETURN(0);
1554                         }
1555                 }
1556                 LASSERT(0);
1557         }
1558
1559         CDEBUG(D_IOCTL, "invalid key\n");
1560         RETURN(-EINVAL);
1561 }
1562
1563 int lmv_set_info(struct obd_export *exp, obd_count keylen,
1564                  void *key, obd_count vallen, void *val)
1565 {
1566         struct obd_device *obd;
1567         struct lmv_obd *lmv;
1568         ENTRY;
1569
1570         obd = class_exp2obd(exp);
1571         if (obd == NULL) {
1572                 CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",
1573                        exp->exp_handle.h_cookie);
1574                 RETURN(-EINVAL);
1575         }
1576         lmv = &obd->u.lmv;
1577
1578         if (keylen >= strlen("client") && strcmp(key, "client") == 0) {
1579                 struct lmv_tgt_desc *tgts;
1580                 int i, rc;
1581
1582                 rc = lmv_check_connect(obd);
1583                 if (rc)
1584                         RETURN(rc);
1585
1586                 for (i = 0, tgts = lmv->tgts; 
1587                         i < lmv->desc.ld_tgt_count; i++, tgts++) {
1588                         rc = obd_set_info(tgts->ltd_exp, keylen, key, vallen, val);
1589                         if (rc)
1590                                 RETURN(rc);
1591                 }
1592                 RETURN(0);
1593         } else if (keylen >= strlen("inter_mds") && strcmp(key, "inter_mds") == 0) {
1594                 lmv->server_timeout = 1;
1595                 lmv_set_timeouts(obd);
1596                 RETURN(0);
1597         }
1598         
1599         RETURN(-EINVAL);
1600 }
1601
1602 int lmv_packmd(struct obd_export *exp, struct lov_mds_md **lmmp,
1603                struct lov_stripe_md *lsm)
1604 {
1605         struct obd_device *obd = class_exp2obd(exp);
1606         struct lmv_obd *lmv = &obd->u.lmv;
1607         int mea_size;
1608         ENTRY;
1609
1610         mea_size = sizeof(struct ll_fid) * 
1611                 lmv->desc.ld_tgt_count + sizeof(struct mea);
1612         if (!lmmp)
1613                 RETURN(mea_size);
1614
1615         if (*lmmp && !lsm) {
1616                 OBD_FREE(*lmmp, mea_size);
1617                 *lmmp = NULL;
1618                 RETURN(0);
1619         }
1620
1621         if (*lmmp == NULL) {
1622                 OBD_ALLOC(*lmmp, mea_size);
1623                 if (*lmmp == NULL)
1624                         RETURN(-ENOMEM);
1625         }
1626
1627         if (!lsm)
1628                 RETURN(mea_size);
1629
1630 #warning "MEA packing/convertation must be here! -bzzz"
1631         memcpy(*lmmp, lsm, mea_size);
1632         RETURN(mea_size);
1633 }
1634
1635 int lmv_unpackmd(struct obd_export *exp, struct lov_stripe_md **mem_tgt,
1636                  struct lov_mds_md *disk_src, int mdsize)
1637 {
1638         struct obd_device *obd = class_exp2obd(exp);
1639         struct lmv_obd *lmv = &obd->u.lmv;
1640         struct mea **tmea = (struct mea **) mem_tgt;
1641         struct mea *mea = (void *) disk_src;
1642         int mea_size;
1643         ENTRY;
1644
1645         mea_size = sizeof(struct ll_fid) * 
1646                 lmv->desc.ld_tgt_count + sizeof(struct mea);
1647         if (mem_tgt == NULL)
1648                 return mea_size;
1649
1650         if (*mem_tgt != NULL && disk_src == NULL) {
1651                 OBD_FREE(*tmea, mea_size);
1652                 RETURN(0);
1653         }
1654
1655         LASSERT(mea_size == mdsize);
1656
1657         OBD_ALLOC(*tmea, mea_size);
1658         if (*tmea == NULL)
1659                 RETURN(-ENOMEM);
1660
1661         if (!disk_src)
1662                 RETURN(mea_size);
1663
1664 #warning "MEA unpacking/convertation must be here! -bzzz"
1665         memcpy(*tmea, mea, mdsize);
1666         RETURN(mea_size);
1667 }
1668
1669 int lmv_brw(int rw, struct obd_export *exp, struct obdo *oa,
1670             struct lov_stripe_md *ea, obd_count oa_bufs,
1671             struct brw_page *pgarr, struct obd_trans_info *oti)
1672 {
1673         struct obd_device *obd = exp->exp_obd;
1674         struct lmv_obd *lmv = &obd->u.lmv;
1675         struct mea *mea = (struct mea *) ea;
1676         int err;
1677       
1678         LASSERT(oa != NULL);
1679         LASSERT(ea != NULL);
1680         LASSERT(pgarr != NULL);
1681         LASSERT(oa->o_mds < lmv->desc.ld_tgt_count);
1682
1683         oa->o_gr = mea->mea_fids[oa->o_mds].generation;
1684         oa->o_id = mea->mea_fids[oa->o_mds].id;
1685         oa->o_valid =  OBD_MD_FLID | OBD_MD_FLGROUP;
1686         err = obd_brw(rw, lmv->tgts[oa->o_mds].ltd_exp, oa,
1687                       NULL, oa_bufs, pgarr, oti);
1688         RETURN(err);
1689 }
1690
1691 struct obd_ops lmv_obd_ops = {
1692         .o_owner                = THIS_MODULE,
1693         .o_attach               = lmv_attach,
1694         .o_detach               = lmv_detach,
1695         .o_setup                = lmv_setup,
1696         .o_cleanup              = lmv_cleanup,
1697         .o_connect              = lmv_connect,
1698         .o_disconnect           = lmv_disconnect,
1699         .o_statfs               = lmv_statfs,
1700         .o_get_info             = lmv_get_info,
1701         .o_set_info             = lmv_set_info,
1702         .o_create               = lmv_obd_create,
1703         .o_packmd               = lmv_packmd,
1704         .o_unpackmd             = lmv_unpackmd,
1705         .o_brw                  = lmv_brw,
1706         .o_init_ea_size         = lmv_init_ea_size,
1707         .o_notify               = lmv_notify,
1708         .o_iocontrol            = lmv_iocontrol,
1709 };
1710
1711 struct md_ops lmv_md_ops = {
1712         .m_getstatus            = lmv_getstatus,
1713         .m_getattr              = lmv_getattr,
1714         .m_change_cbdata        = lmv_change_cbdata,
1715         .m_change_cbdata_name   = lmv_change_cbdata_name,
1716         .m_close                = lmv_close,
1717         .m_create               = lmv_create,
1718         .m_done_writing         = lmv_done_writing,
1719         .m_enqueue              = lmv_enqueue,
1720         .m_getattr_name         = lmv_getattr_name,
1721         .m_intent_lock          = lmv_intent_lock,
1722         .m_link                 = lmv_link,
1723         .m_rename               = lmv_rename,
1724         .m_setattr              = lmv_setattr,
1725         .m_sync                 = lmv_sync,
1726         .m_readpage             = lmv_readpage,
1727         .m_unlink               = lmv_unlink,
1728         .m_get_real_obd         = lmv_get_real_obd,
1729         .m_valid_attrs          = lmv_valid_attrs,
1730         .m_delete_object        = lmv_delete_object,
1731 };
1732
1733 int __init lmv_init(void)
1734 {
1735         struct lprocfs_static_vars lvars;
1736         int rc;
1737
1738         lprocfs_init_vars(lmv, &lvars);
1739         rc = class_register_type(&lmv_obd_ops, &lmv_md_ops,
1740                                  lvars.module_vars, OBD_LMV_DEVICENAME);
1741         RETURN(rc);
1742 }
1743
1744 #ifdef __KERNEL__
1745 static void lmv_exit(void)
1746 {
1747         class_unregister_type(OBD_LMV_DEVICENAME);
1748 }
1749
1750 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
1751 MODULE_DESCRIPTION("Lustre Logical Metadata Volume OBD driver");
1752 MODULE_LICENSE("GPL");
1753
1754 module_init(lmv_init);
1755 module_exit(lmv_exit);
1756 #endif