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LU-6485 libcfs: embed kr_data into kkuc_reg
[fs/lustre-release.git] / lustre / lmv / lmv_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) 2004, 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
37 #define DEBUG_SUBSYSTEM S_LMV
38 #include <linux/slab.h>
39 #include <linux/module.h>
40 #include <linux/init.h>
41 #include <linux/user_namespace.h>
42 #ifdef HAVE_UIDGID_HEADER
43 # include <linux/uidgid.h>
44 #endif
45 #include <linux/slab.h>
46 #include <linux/pagemap.h>
47 #include <linux/mm.h>
48 #include <linux/math64.h>
49 #include <linux/seq_file.h>
50 #include <linux/namei.h>
51
52 #include <lustre/lustre_idl.h>
53 #include <obd_support.h>
54 #include <lustre_lib.h>
55 #include <lustre_net.h>
56 #include <obd_class.h>
57 #include <lustre_lmv.h>
58 #include <lprocfs_status.h>
59 #include <cl_object.h>
60 #include <lustre_fid.h>
61 #include <lustre_ioctl.h>
62 #include <lustre_kernelcomm.h>
63 #include "lmv_internal.h"
64
65 static void lmv_activate_target(struct lmv_obd *lmv,
66                                 struct lmv_tgt_desc *tgt,
67                                 int activate)
68 {
69         if (tgt->ltd_active == activate)
70                 return;
71
72         tgt->ltd_active = activate;
73         lmv->desc.ld_active_tgt_count += (activate ? 1 : -1);
74
75         tgt->ltd_exp->exp_obd->obd_inactive = !activate;
76 }
77
78 /**
79  * Error codes:
80  *
81  *  -EINVAL  : UUID can't be found in the LMV's target list
82  *  -ENOTCONN: The UUID is found, but the target connection is bad (!)
83  *  -EBADF   : The UUID is found, but the OBD of the wrong type (!)
84  */
85 static int lmv_set_mdc_active(struct lmv_obd *lmv,
86                               const struct obd_uuid *uuid,
87                               int activate)
88 {
89         struct lmv_tgt_desc     *tgt = NULL;
90         struct obd_device       *obd;
91         __u32                    i;
92         int                      rc = 0;
93         ENTRY;
94
95         CDEBUG(D_INFO, "Searching in lmv %p for uuid %s (activate=%d)\n",
96                         lmv, uuid->uuid, activate);
97
98         spin_lock(&lmv->lmv_lock);
99         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
100                 tgt = lmv->tgts[i];
101                 if (tgt == NULL || tgt->ltd_exp == NULL)
102                         continue;
103
104                 CDEBUG(D_INFO, "Target idx %d is %s conn "LPX64"\n", i,
105                        tgt->ltd_uuid.uuid, tgt->ltd_exp->exp_handle.h_cookie);
106
107                 if (obd_uuid_equals(uuid, &tgt->ltd_uuid))
108                         break;
109         }
110
111         if (i == lmv->desc.ld_tgt_count)
112                 GOTO(out_lmv_lock, rc = -EINVAL);
113
114         obd = class_exp2obd(tgt->ltd_exp);
115         if (obd == NULL)
116                 GOTO(out_lmv_lock, rc = -ENOTCONN);
117
118         CDEBUG(D_INFO, "Found OBD %s=%s device %d (%p) type %s at LMV idx %d\n",
119                obd->obd_name, obd->obd_uuid.uuid, obd->obd_minor, obd,
120                obd->obd_type->typ_name, i);
121         LASSERT(strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) == 0);
122
123         if (tgt->ltd_active == activate) {
124                 CDEBUG(D_INFO, "OBD %p already %sactive!\n", obd,
125                        activate ? "" : "in");
126                 GOTO(out_lmv_lock, rc);
127         }
128
129         CDEBUG(D_INFO, "Marking OBD %p %sactive\n", obd,
130                activate ? "" : "in");
131         lmv_activate_target(lmv, tgt, activate);
132         EXIT;
133
134  out_lmv_lock:
135         spin_unlock(&lmv->lmv_lock);
136         return rc;
137 }
138
139 struct obd_uuid *lmv_get_uuid(struct obd_export *exp)
140 {
141         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
142         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
143
144         return (tgt == NULL) ? NULL : obd_get_uuid(tgt->ltd_exp);
145 }
146
147 static int lmv_notify(struct obd_device *obd, struct obd_device *watched,
148                       enum obd_notify_event ev, void *data)
149 {
150         struct obd_connect_data *conn_data;
151         struct lmv_obd          *lmv = &obd->u.lmv;
152         struct obd_uuid         *uuid;
153         int                      rc = 0;
154         ENTRY;
155
156         if (strcmp(watched->obd_type->typ_name, LUSTRE_MDC_NAME)) {
157                 CERROR("unexpected notification of %s %s!\n",
158                        watched->obd_type->typ_name,
159                        watched->obd_name);
160                 RETURN(-EINVAL);
161         }
162
163         uuid = &watched->u.cli.cl_target_uuid;
164         if (ev == OBD_NOTIFY_ACTIVE || ev == OBD_NOTIFY_INACTIVE) {
165                 /*
166                  * Set MDC as active before notifying the observer, so the
167                  * observer can use the MDC normally.
168                  */
169                 rc = lmv_set_mdc_active(lmv, uuid,
170                                         ev == OBD_NOTIFY_ACTIVE);
171                 if (rc) {
172                         CERROR("%sactivation of %s failed: %d\n",
173                                ev == OBD_NOTIFY_ACTIVE ? "" : "de",
174                                uuid->uuid, rc);
175                         RETURN(rc);
176                 }
177         } else if (ev == OBD_NOTIFY_OCD) {
178                 conn_data = &watched->u.cli.cl_import->imp_connect_data;
179                 /*
180                  * XXX: Make sure that ocd_connect_flags from all targets are
181                  * the same. Otherwise one of MDTs runs wrong version or
182                  * something like this.  --umka
183                  */
184                 obd->obd_self_export->exp_connect_data = *conn_data;
185         }
186 #if 0
187         else if (ev == OBD_NOTIFY_DISCON) {
188                 /*
189                  * For disconnect event, flush fld cache for failout MDS case.
190                  */
191                 fld_client_flush(&lmv->lmv_fld);
192         }
193 #endif
194         /*
195          * Pass the notification up the chain.
196          */
197         if (obd->obd_observer)
198                 rc = obd_notify(obd->obd_observer, watched, ev, data);
199
200         RETURN(rc);
201 }
202
203 /**
204  * This is fake connect function. Its purpose is to initialize lmv and say
205  * caller that everything is okay. Real connection will be performed later.
206  */
207 static int lmv_connect(const struct lu_env *env,
208                        struct obd_export **exp, struct obd_device *obd,
209                        struct obd_uuid *cluuid, struct obd_connect_data *data,
210                        void *localdata)
211 {
212         struct lmv_obd        *lmv = &obd->u.lmv;
213         struct lustre_handle  conn = { 0 };
214         int                    rc = 0;
215         ENTRY;
216
217         /*
218          * We don't want to actually do the underlying connections more than
219          * once, so keep track.
220          */
221         lmv->refcount++;
222         if (lmv->refcount > 1) {
223                 *exp = NULL;
224                 RETURN(0);
225         }
226
227         rc = class_connect(&conn, obd, cluuid);
228         if (rc) {
229                 CERROR("class_connection() returned %d\n", rc);
230                 RETURN(rc);
231         }
232
233         *exp = class_conn2export(&conn);
234         class_export_get(*exp);
235
236         lmv->exp = *exp;
237         lmv->connected = 0;
238         lmv->cluuid = *cluuid;
239
240         if (data)
241                 lmv->conn_data = *data;
242
243         if (lmv->targets_proc_entry == NULL) {
244                 lmv->targets_proc_entry = lprocfs_register("target_obds",
245                                                            obd->obd_proc_entry,
246                                                            NULL, NULL);
247                 if (IS_ERR(lmv->targets_proc_entry)) {
248                         CERROR("%s: cannot register "
249                                "/proc/fs/lustre/%s/%s/target_obds\n",
250                                obd->obd_name, obd->obd_type->typ_name,
251                                obd->obd_name);
252                         lmv->targets_proc_entry = NULL;
253                 }
254         }
255
256         /*
257          * All real clients should perform actual connection right away, because
258          * it is possible, that LMV will not have opportunity to connect targets
259          * and MDC stuff will be called directly, for instance while reading
260          * ../mdc/../kbytesfree procfs file, etc.
261          */
262         if (data != NULL && (data->ocd_connect_flags & OBD_CONNECT_REAL))
263                 rc = lmv_check_connect(obd);
264
265         if (rc && lmv->targets_proc_entry != NULL)
266                 lprocfs_remove(&lmv->targets_proc_entry);
267         RETURN(rc);
268 }
269
270 static int lmv_init_ea_size(struct obd_export *exp, __u32 easize,
271                             __u32 def_easize)
272 {
273         struct obd_device       *obd = exp->exp_obd;
274         struct lmv_obd          *lmv = &obd->u.lmv;
275         __u32                    i;
276         int                      rc = 0;
277         int                      change = 0;
278         ENTRY;
279
280         if (lmv->max_easize < easize) {
281                 lmv->max_easize = easize;
282                 change = 1;
283         }
284         if (lmv->max_def_easize < def_easize) {
285                 lmv->max_def_easize = def_easize;
286                 change = 1;
287         }
288
289         if (change == 0)
290                 RETURN(0);
291
292         if (lmv->connected == 0)
293                 RETURN(0);
294
295         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
296                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
297
298                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active) {
299                         CWARN("%s: NULL export for %d\n", obd->obd_name, i);
300                         continue;
301                 }
302
303                 rc = md_init_ea_size(tgt->ltd_exp, easize, def_easize);
304                 if (rc) {
305                         CERROR("%s: obd_init_ea_size() failed on MDT target %d:"
306                                " rc = %d\n", obd->obd_name, i, rc);
307                         break;
308                 }
309         }
310         RETURN(rc);
311 }
312
313 #define MAX_STRING_SIZE 128
314
315 int lmv_connect_mdc(struct obd_device *obd, struct lmv_tgt_desc *tgt)
316 {
317         struct lmv_obd          *lmv = &obd->u.lmv;
318         struct obd_uuid         *cluuid = &lmv->cluuid;
319         struct obd_uuid          lmv_mdc_uuid = { "LMV_MDC_UUID" };
320         struct obd_device       *mdc_obd;
321         struct obd_export       *mdc_exp;
322         struct lu_fld_target     target;
323         int                      rc;
324         ENTRY;
325
326         mdc_obd = class_find_client_obd(&tgt->ltd_uuid, LUSTRE_MDC_NAME,
327                                         &obd->obd_uuid);
328         if (!mdc_obd) {
329                 CERROR("target %s not attached\n", tgt->ltd_uuid.uuid);
330                 RETURN(-EINVAL);
331         }
332
333         CDEBUG(D_CONFIG, "connect to %s(%s) - %s, %s FOR %s\n",
334                 mdc_obd->obd_name, mdc_obd->obd_uuid.uuid,
335                 tgt->ltd_uuid.uuid, obd->obd_uuid.uuid,
336                 cluuid->uuid);
337
338         if (!mdc_obd->obd_set_up) {
339                 CERROR("target %s is not set up\n", tgt->ltd_uuid.uuid);
340                 RETURN(-EINVAL);
341         }
342
343         rc = obd_connect(NULL, &mdc_exp, mdc_obd, &lmv_mdc_uuid,
344                          &lmv->conn_data, NULL);
345         if (rc) {
346                 CERROR("target %s connect error %d\n", tgt->ltd_uuid.uuid, rc);
347                 RETURN(rc);
348         }
349
350         /*
351          * Init fid sequence client for this mdc and add new fld target.
352          */
353         rc = obd_fid_init(mdc_obd, mdc_exp, LUSTRE_SEQ_METADATA);
354         if (rc)
355                 RETURN(rc);
356
357         target.ft_srv = NULL;
358         target.ft_exp = mdc_exp;
359         target.ft_idx = tgt->ltd_idx;
360
361         fld_client_add_target(&lmv->lmv_fld, &target);
362
363         rc = obd_register_observer(mdc_obd, obd);
364         if (rc) {
365                 obd_disconnect(mdc_exp);
366                 CERROR("target %s register_observer error %d\n",
367                        tgt->ltd_uuid.uuid, rc);
368                 RETURN(rc);
369         }
370
371         if (obd->obd_observer) {
372                 /*
373                  * Tell the observer about the new target.
374                  */
375                 rc = obd_notify(obd->obd_observer, mdc_exp->exp_obd,
376                                 OBD_NOTIFY_ACTIVE,
377                                 (void *)(tgt - lmv->tgts[0]));
378                 if (rc) {
379                         obd_disconnect(mdc_exp);
380                         RETURN(rc);
381                 }
382         }
383
384         tgt->ltd_active = 1;
385         tgt->ltd_exp = mdc_exp;
386         lmv->desc.ld_active_tgt_count++;
387
388         md_init_ea_size(tgt->ltd_exp, lmv->max_easize, lmv->max_def_easize);
389
390         CDEBUG(D_CONFIG, "Connected to %s(%s) successfully (%d)\n",
391                 mdc_obd->obd_name, mdc_obd->obd_uuid.uuid,
392                 atomic_read(&obd->obd_refcount));
393
394         if (lmv->targets_proc_entry != NULL) {
395                 struct proc_dir_entry *mdc_symlink;
396
397                 LASSERT(mdc_obd->obd_type != NULL);
398                 LASSERT(mdc_obd->obd_type->typ_name != NULL);
399                 mdc_symlink = lprocfs_add_symlink(mdc_obd->obd_name,
400                                                   lmv->targets_proc_entry,
401                                                   "../../../%s/%s",
402                                                   mdc_obd->obd_type->typ_name,
403                                                   mdc_obd->obd_name);
404                 if (mdc_symlink == NULL) {
405                         CERROR("cannot register LMV target "
406                                "/proc/fs/lustre/%s/%s/target_obds/%s\n",
407                                obd->obd_type->typ_name, obd->obd_name,
408                                mdc_obd->obd_name);
409                 }
410         }
411         RETURN(0);
412 }
413
414 static void lmv_del_target(struct lmv_obd *lmv, int index)
415 {
416         if (lmv->tgts[index] == NULL)
417                 return;
418
419         OBD_FREE_PTR(lmv->tgts[index]);
420         lmv->tgts[index] = NULL;
421         return;
422 }
423
424 static int lmv_add_target(struct obd_device *obd, struct obd_uuid *uuidp,
425                            __u32 index, int gen)
426 {
427         struct obd_device *mdc_obd;
428         struct lmv_obd      *lmv = &obd->u.lmv;
429         struct lmv_tgt_desc *tgt;
430         int                  orig_tgt_count = 0;
431         int                  rc = 0;
432         ENTRY;
433
434         CDEBUG(D_CONFIG, "Target uuid: %s. index %d\n", uuidp->uuid, index);
435         mdc_obd = class_find_client_obd(uuidp, LUSTRE_MDC_NAME,
436                                         &obd->obd_uuid);
437         if (!mdc_obd) {
438                 CERROR("%s: Target %s not attached: rc = %d\n",
439                        obd->obd_name, uuidp->uuid, -EINVAL);
440                 RETURN(-EINVAL);
441         }
442
443         mutex_lock(&lmv->lmv_init_mutex);
444         if ((index < lmv->tgts_size) && (lmv->tgts[index] != NULL)) {
445                 tgt = lmv->tgts[index];
446                 CERROR("%s: UUID %s already assigned at LOV target index %d:"
447                        " rc = %d\n", obd->obd_name,
448                        obd_uuid2str(&tgt->ltd_uuid), index, -EEXIST);
449                 mutex_unlock(&lmv->lmv_init_mutex);
450                 RETURN(-EEXIST);
451         }
452
453         if (index >= lmv->tgts_size) {
454                 /* We need to reallocate the lmv target array. */
455                 struct lmv_tgt_desc **newtgts, **old = NULL;
456                 __u32 newsize = 1;
457                 __u32 oldsize = 0;
458
459                 while (newsize < index + 1)
460                         newsize = newsize << 1;
461                 OBD_ALLOC(newtgts, sizeof(*newtgts) * newsize);
462                 if (newtgts == NULL) {
463                         mutex_unlock(&lmv->lmv_init_mutex);
464                         RETURN(-ENOMEM);
465                 }
466
467                 if (lmv->tgts_size) {
468                         memcpy(newtgts, lmv->tgts,
469                                sizeof(*newtgts) * lmv->tgts_size);
470                         old = lmv->tgts;
471                         oldsize = lmv->tgts_size;
472                 }
473
474                 lmv->tgts = newtgts;
475                 lmv->tgts_size = newsize;
476                 smp_rmb();
477                 if (old)
478                         OBD_FREE(old, sizeof(*old) * oldsize);
479
480                 CDEBUG(D_CONFIG, "tgts: %p size: %d\n", lmv->tgts,
481                        lmv->tgts_size);
482         }
483
484         OBD_ALLOC_PTR(tgt);
485         if (!tgt) {
486                 mutex_unlock(&lmv->lmv_init_mutex);
487                 RETURN(-ENOMEM);
488         }
489
490         mutex_init(&tgt->ltd_fid_mutex);
491         tgt->ltd_idx = index;
492         tgt->ltd_uuid = *uuidp;
493         tgt->ltd_active = 0;
494         lmv->tgts[index] = tgt;
495         if (index >= lmv->desc.ld_tgt_count) {
496                 orig_tgt_count = lmv->desc.ld_tgt_count;
497                 lmv->desc.ld_tgt_count = index + 1;
498         }
499
500         if (lmv->connected == 0) {
501                 /* lmv_check_connect() will connect this target. */
502                 mutex_unlock(&lmv->lmv_init_mutex);
503                 RETURN(0);
504         }
505
506         /* Otherwise let's connect it ourselves */
507         mutex_unlock(&lmv->lmv_init_mutex);
508         rc = lmv_connect_mdc(obd, tgt);
509         if (rc != 0) {
510                 spin_lock(&lmv->lmv_lock);
511                 if (lmv->desc.ld_tgt_count == index + 1)
512                         lmv->desc.ld_tgt_count = orig_tgt_count;
513                 memset(tgt, 0, sizeof(*tgt));
514                 spin_unlock(&lmv->lmv_lock);
515         } else {
516                 int easize = sizeof(struct lmv_stripe_md) +
517                         lmv->desc.ld_tgt_count * sizeof(struct lu_fid);
518                 lmv_init_ea_size(obd->obd_self_export, easize, 0);
519         }
520
521         RETURN(rc);
522 }
523
524 int lmv_check_connect(struct obd_device *obd)
525 {
526         struct lmv_obd          *lmv = &obd->u.lmv;
527         struct lmv_tgt_desc     *tgt;
528         __u32                    i;
529         int                      rc;
530         int                      easize;
531         ENTRY;
532
533         if (lmv->connected)
534                 RETURN(0);
535
536         mutex_lock(&lmv->lmv_init_mutex);
537         if (lmv->connected) {
538                 mutex_unlock(&lmv->lmv_init_mutex);
539                 RETURN(0);
540         }
541
542         if (lmv->desc.ld_tgt_count == 0) {
543                 mutex_unlock(&lmv->lmv_init_mutex);
544                 CERROR("%s: no targets configured.\n", obd->obd_name);
545                 RETURN(-EINVAL);
546         }
547
548         LASSERT(lmv->tgts != NULL);
549
550         if (lmv->tgts[0] == NULL) {
551                 mutex_unlock(&lmv->lmv_init_mutex);
552                 CERROR("%s: no target configured for index 0.\n",
553                        obd->obd_name);
554                 RETURN(-EINVAL);
555         }
556
557         CDEBUG(D_CONFIG, "Time to connect %s to %s\n",
558                lmv->cluuid.uuid, obd->obd_name);
559
560         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
561                 tgt = lmv->tgts[i];
562                 if (tgt == NULL)
563                         continue;
564                 rc = lmv_connect_mdc(obd, tgt);
565                 if (rc)
566                         GOTO(out_disc, rc);
567         }
568
569         class_export_put(lmv->exp);
570         lmv->connected = 1;
571         easize = lmv_mds_md_size(lmv->desc.ld_tgt_count, LMV_MAGIC);
572         lmv_init_ea_size(obd->obd_self_export, easize, 0);
573         mutex_unlock(&lmv->lmv_init_mutex);
574         RETURN(0);
575
576  out_disc:
577         while (i-- > 0) {
578                 int rc2;
579                 tgt = lmv->tgts[i];
580                 if (tgt == NULL)
581                         continue;
582                 tgt->ltd_active = 0;
583                 if (tgt->ltd_exp) {
584                         --lmv->desc.ld_active_tgt_count;
585                         rc2 = obd_disconnect(tgt->ltd_exp);
586                         if (rc2) {
587                                 CERROR("LMV target %s disconnect on "
588                                        "MDC idx %d: error %d\n",
589                                        tgt->ltd_uuid.uuid, i, rc2);
590                         }
591                 }
592         }
593         class_disconnect(lmv->exp);
594         mutex_unlock(&lmv->lmv_init_mutex);
595         RETURN(rc);
596 }
597
598 static int lmv_disconnect_mdc(struct obd_device *obd, struct lmv_tgt_desc *tgt)
599 {
600         struct lmv_obd         *lmv = &obd->u.lmv;
601         struct obd_device      *mdc_obd;
602         int                     rc;
603         ENTRY;
604
605         LASSERT(tgt != NULL);
606         LASSERT(obd != NULL);
607
608         mdc_obd = class_exp2obd(tgt->ltd_exp);
609
610         if (mdc_obd) {
611                 mdc_obd->obd_force = obd->obd_force;
612                 mdc_obd->obd_fail = obd->obd_fail;
613                 mdc_obd->obd_no_recov = obd->obd_no_recov;
614
615                 if (lmv->targets_proc_entry != NULL)
616                         lprocfs_remove_proc_entry(mdc_obd->obd_name,
617                                                   lmv->targets_proc_entry);
618         }
619
620         rc = obd_fid_fini(tgt->ltd_exp->exp_obd);
621         if (rc)
622                 CERROR("Can't finanize fids factory\n");
623
624         CDEBUG(D_INFO, "Disconnected from %s(%s) successfully\n",
625                tgt->ltd_exp->exp_obd->obd_name,
626                tgt->ltd_exp->exp_obd->obd_uuid.uuid);
627
628         obd_register_observer(tgt->ltd_exp->exp_obd, NULL);
629         rc = obd_disconnect(tgt->ltd_exp);
630         if (rc) {
631                 if (tgt->ltd_active) {
632                         CERROR("Target %s disconnect error %d\n",
633                                tgt->ltd_uuid.uuid, rc);
634                 }
635         }
636
637         lmv_activate_target(lmv, tgt, 0);
638         tgt->ltd_exp = NULL;
639         RETURN(0);
640 }
641
642 static int lmv_disconnect(struct obd_export *exp)
643 {
644         struct obd_device       *obd = class_exp2obd(exp);
645         struct lmv_obd          *lmv = &obd->u.lmv;
646         int                      rc;
647         __u32                    i;
648         ENTRY;
649
650         if (!lmv->tgts)
651                 goto out_local;
652
653         /*
654          * Only disconnect the underlying layers on the final disconnect.
655          */
656         lmv->refcount--;
657         if (lmv->refcount != 0)
658                 goto out_local;
659
660         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
661                 if (lmv->tgts[i] == NULL || lmv->tgts[i]->ltd_exp == NULL)
662                         continue;
663
664                 lmv_disconnect_mdc(obd, lmv->tgts[i]);
665         }
666
667         if (lmv->targets_proc_entry != NULL)
668                 lprocfs_remove(&lmv->targets_proc_entry);
669         else
670                 CERROR("/proc/fs/lustre/%s/%s/target_obds missing\n",
671                        obd->obd_type->typ_name, obd->obd_name);
672
673 out_local:
674         /*
675          * This is the case when no real connection is established by
676          * lmv_check_connect().
677          */
678         if (!lmv->connected)
679                 class_export_put(exp);
680         rc = class_disconnect(exp);
681         if (lmv->refcount == 0)
682                 lmv->connected = 0;
683         RETURN(rc);
684 }
685
686 static int lmv_fid2path(struct obd_export *exp, int len, void *karg, void *uarg)
687 {
688         struct obd_device       *obddev = class_exp2obd(exp);
689         struct lmv_obd          *lmv = &obddev->u.lmv;
690         struct getinfo_fid2path *gf;
691         struct lmv_tgt_desc     *tgt;
692         struct getinfo_fid2path *remote_gf = NULL;
693         int                     remote_gf_size = 0;
694         int                     rc;
695
696         gf = (struct getinfo_fid2path *)karg;
697         tgt = lmv_find_target(lmv, &gf->gf_fid);
698         if (IS_ERR(tgt))
699                 RETURN(PTR_ERR(tgt));
700
701 repeat_fid2path:
702         rc = obd_iocontrol(OBD_IOC_FID2PATH, tgt->ltd_exp, len, gf, uarg);
703         if (rc != 0 && rc != -EREMOTE)
704                 GOTO(out_fid2path, rc);
705
706         /* If remote_gf != NULL, it means just building the
707          * path on the remote MDT, copy this path segement to gf */
708         if (remote_gf != NULL) {
709                 struct getinfo_fid2path *ori_gf;
710                 char *ptr;
711
712                 ori_gf = (struct getinfo_fid2path *)karg;
713                 if (strlen(ori_gf->gf_path) +
714                     strlen(gf->gf_path) > ori_gf->gf_pathlen)
715                         GOTO(out_fid2path, rc = -EOVERFLOW);
716
717                 ptr = ori_gf->gf_path;
718
719                 memmove(ptr + strlen(gf->gf_path) + 1, ptr,
720                         strlen(ori_gf->gf_path));
721
722                 strncpy(ptr, gf->gf_path, strlen(gf->gf_path));
723                 ptr += strlen(gf->gf_path);
724                 *ptr = '/';
725         }
726
727         CDEBUG(D_INFO, "%s: get path %s "DFID" rec: "LPU64" ln: %u\n",
728                tgt->ltd_exp->exp_obd->obd_name,
729                gf->gf_path, PFID(&gf->gf_fid), gf->gf_recno,
730                gf->gf_linkno);
731
732         if (rc == 0)
733                 GOTO(out_fid2path, rc);
734
735         /* sigh, has to go to another MDT to do path building further */
736         if (remote_gf == NULL) {
737                 remote_gf_size = sizeof(*remote_gf) + PATH_MAX;
738                 OBD_ALLOC(remote_gf, remote_gf_size);
739                 if (remote_gf == NULL)
740                         GOTO(out_fid2path, rc = -ENOMEM);
741                 remote_gf->gf_pathlen = PATH_MAX;
742         }
743
744         if (!fid_is_sane(&gf->gf_fid)) {
745                 CERROR("%s: invalid FID "DFID": rc = %d\n",
746                        tgt->ltd_exp->exp_obd->obd_name,
747                        PFID(&gf->gf_fid), -EINVAL);
748                 GOTO(out_fid2path, rc = -EINVAL);
749         }
750
751         tgt = lmv_find_target(lmv, &gf->gf_fid);
752         if (IS_ERR(tgt))
753                 GOTO(out_fid2path, rc = -EINVAL);
754
755         remote_gf->gf_fid = gf->gf_fid;
756         remote_gf->gf_recno = -1;
757         remote_gf->gf_linkno = -1;
758         memset(remote_gf->gf_path, 0, remote_gf->gf_pathlen);
759         gf = remote_gf;
760         goto repeat_fid2path;
761
762 out_fid2path:
763         if (remote_gf != NULL)
764                 OBD_FREE(remote_gf, remote_gf_size);
765         RETURN(rc);
766 }
767
768 static int lmv_hsm_req_count(struct lmv_obd *lmv,
769                              const struct hsm_user_request *hur,
770                              const struct lmv_tgt_desc *tgt_mds)
771 {
772         __u32                    i;
773         int                      nr = 0;
774         struct lmv_tgt_desc     *curr_tgt;
775
776         /* count how many requests must be sent to the given target */
777         for (i = 0; i < hur->hur_request.hr_itemcount; i++) {
778                 curr_tgt = lmv_find_target(lmv, &hur->hur_user_item[i].hui_fid);
779                 if (obd_uuid_equals(&curr_tgt->ltd_uuid, &tgt_mds->ltd_uuid))
780                         nr++;
781         }
782         return nr;
783 }
784
785 static void lmv_hsm_req_build(struct lmv_obd *lmv,
786                               struct hsm_user_request *hur_in,
787                               const struct lmv_tgt_desc *tgt_mds,
788                               struct hsm_user_request *hur_out)
789 {
790         __u32                    i, nr_out;
791         struct lmv_tgt_desc     *curr_tgt;
792
793         /* build the hsm_user_request for the given target */
794         hur_out->hur_request = hur_in->hur_request;
795         nr_out = 0;
796         for (i = 0; i < hur_in->hur_request.hr_itemcount; i++) {
797                 curr_tgt = lmv_find_target(lmv,
798                                            &hur_in->hur_user_item[i].hui_fid);
799                 if (obd_uuid_equals(&curr_tgt->ltd_uuid, &tgt_mds->ltd_uuid)) {
800                         hur_out->hur_user_item[nr_out] =
801                                                 hur_in->hur_user_item[i];
802                         nr_out++;
803                 }
804         }
805         hur_out->hur_request.hr_itemcount = nr_out;
806         memcpy(hur_data(hur_out), hur_data(hur_in),
807                hur_in->hur_request.hr_data_len);
808 }
809
810 static int lmv_hsm_ct_unregister(struct lmv_obd *lmv, unsigned int cmd, int len,
811                                  struct lustre_kernelcomm *lk, void *uarg)
812 {
813         __u32   i;
814         int     rc;
815         ENTRY;
816
817         /* unregister request (call from llapi_hsm_copytool_fini) */
818         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
819                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
820
821                 if (tgt == NULL || tgt->ltd_exp == NULL)
822                         continue;
823                 /* best effort: try to clean as much as possible
824                  * (continue on error) */
825                 obd_iocontrol(cmd, tgt->ltd_exp, len, lk, uarg);
826         }
827
828         /* Whatever the result, remove copytool from kuc groups.
829          * Unreached coordinators will get EPIPE on next requests
830          * and will unregister automatically.
831          */
832         rc = libcfs_kkuc_group_rem(lk->lk_uid, lk->lk_group);
833
834         RETURN(rc);
835 }
836
837 static int lmv_hsm_ct_register(struct lmv_obd *lmv, unsigned int cmd, int len,
838                                struct lustre_kernelcomm *lk, void *uarg)
839 {
840         struct file             *filp;
841         __u32                    i, j;
842         int                      err, rc;
843         bool                     any_set = false;
844         struct kkuc_ct_data      kcd = { 0 };
845         ENTRY;
846
847         /* All or nothing: try to register to all MDS.
848          * In case of failure, unregister from previous MDS,
849          * except if it because of inactive target. */
850         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
851                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
852
853                 if (tgt == NULL || tgt->ltd_exp == NULL)
854                         continue;
855                 err = obd_iocontrol(cmd, tgt->ltd_exp, len, lk, uarg);
856                 if (err) {
857                         if (tgt->ltd_active) {
858                                 /* permanent error */
859                                 CERROR("%s: iocontrol MDC %s on MDT"
860                                        " idx %d cmd %x: err = %d\n",
861                                        class_exp2obd(lmv->exp)->obd_name,
862                                        tgt->ltd_uuid.uuid, i, cmd, err);
863                                 rc = err;
864                                 lk->lk_flags |= LK_FLG_STOP;
865                                 /* unregister from previous MDS */
866                                 for (j = 0; j < i; j++) {
867                                         tgt = lmv->tgts[j];
868                                         if (tgt == NULL || tgt->ltd_exp == NULL)
869                                                 continue;
870                                         obd_iocontrol(cmd, tgt->ltd_exp, len,
871                                                       lk, uarg);
872                                 }
873                                 RETURN(rc);
874                         }
875                         /* else: transient error.
876                          * kuc will register to the missing MDT
877                          * when it is back */
878                 } else {
879                         any_set = true;
880                 }
881         }
882
883         if (!any_set)
884                 /* no registration done: return error */
885                 RETURN(-ENOTCONN);
886
887         /* at least one registration done, with no failure */
888         filp = fget(lk->lk_wfd);
889         if (filp == NULL)
890                 RETURN(-EBADF);
891
892         kcd.kcd_magic = KKUC_CT_DATA_MAGIC;
893         kcd.kcd_uuid = lmv->cluuid;
894         kcd.kcd_archive = lk->lk_data;
895
896         rc = libcfs_kkuc_group_add(filp, lk->lk_uid, lk->lk_group,
897                                    &kcd, sizeof(kcd));
898         if (rc != 0)
899                 fput(filp);
900
901         RETURN(rc);
902 }
903
904
905
906
907 static int lmv_iocontrol(unsigned int cmd, struct obd_export *exp,
908                          int len, void *karg, void *uarg)
909 {
910         struct obd_device       *obddev = class_exp2obd(exp);
911         struct lmv_obd          *lmv = &obddev->u.lmv;
912         struct lmv_tgt_desc     *tgt = NULL;
913         __u32                    i = 0;
914         int                      rc = 0;
915         int                      set = 0;
916         __u32                    count = lmv->desc.ld_tgt_count;
917         ENTRY;
918
919         if (count == 0)
920                 RETURN(-ENOTTY);
921
922         switch (cmd) {
923         case IOC_OBD_STATFS: {
924                 struct obd_ioctl_data *data = karg;
925                 struct obd_device *mdc_obd;
926                 struct obd_statfs stat_buf = {0};
927                 __u32 index;
928
929                 memcpy(&index, data->ioc_inlbuf2, sizeof(__u32));
930                 if ((index >= count))
931                         RETURN(-ENODEV);
932
933                 tgt = lmv->tgts[index];
934                 if (tgt == NULL || !tgt->ltd_active)
935                         RETURN(-ENODATA);
936
937                 mdc_obd = class_exp2obd(tgt->ltd_exp);
938                 if (!mdc_obd)
939                         RETURN(-EINVAL);
940
941                 /* copy UUID */
942                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(mdc_obd),
943                                  min((int) data->ioc_plen2,
944                                      (int) sizeof(struct obd_uuid))))
945                         RETURN(-EFAULT);
946
947                 rc = obd_statfs(NULL, tgt->ltd_exp, &stat_buf,
948                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
949                                 0);
950                 if (rc)
951                         RETURN(rc);
952                 if (copy_to_user(data->ioc_pbuf1, &stat_buf,
953                                  min((int) data->ioc_plen1,
954                                      (int) sizeof(stat_buf))))
955                         RETURN(-EFAULT);
956                 break;
957         }
958         case OBD_IOC_QUOTACTL: {
959                 struct if_quotactl *qctl = karg;
960                 struct obd_quotactl *oqctl;
961
962                 if (qctl->qc_valid == QC_MDTIDX) {
963                         if (count <= qctl->qc_idx)
964                                 RETURN(-EINVAL);
965
966                         tgt = lmv->tgts[qctl->qc_idx];
967                         if (tgt == NULL || tgt->ltd_exp == NULL)
968                                 RETURN(-EINVAL);
969                 } else if (qctl->qc_valid == QC_UUID) {
970                         for (i = 0; i < count; i++) {
971                                 tgt = lmv->tgts[i];
972                                 if (tgt == NULL)
973                                         continue;
974                                 if (!obd_uuid_equals(&tgt->ltd_uuid,
975                                                      &qctl->obd_uuid))
976                                         continue;
977
978                                 if (tgt->ltd_exp == NULL)
979                                         RETURN(-EINVAL);
980
981                                 break;
982                         }
983                 } else {
984                         RETURN(-EINVAL);
985                 }
986
987                 if (i >= count)
988                         RETURN(-EAGAIN);
989
990                 LASSERT(tgt != NULL && tgt->ltd_exp != NULL);
991                 OBD_ALLOC_PTR(oqctl);
992                 if (!oqctl)
993                         RETURN(-ENOMEM);
994
995                 QCTL_COPY(oqctl, qctl);
996                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
997                 if (rc == 0) {
998                         QCTL_COPY(qctl, oqctl);
999                         qctl->qc_valid = QC_MDTIDX;
1000                         qctl->obd_uuid = tgt->ltd_uuid;
1001                 }
1002                 OBD_FREE_PTR(oqctl);
1003                 break;
1004         }
1005         case OBD_IOC_CHANGELOG_SEND:
1006         case OBD_IOC_CHANGELOG_CLEAR: {
1007                 struct ioc_changelog *icc = karg;
1008
1009                 if (icc->icc_mdtindex >= count)
1010                         RETURN(-ENODEV);
1011
1012                 tgt = lmv->tgts[icc->icc_mdtindex];
1013                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active)
1014                         RETURN(-ENODEV);
1015                 rc = obd_iocontrol(cmd, tgt->ltd_exp, sizeof(*icc), icc, NULL);
1016                 break;
1017         }
1018         case LL_IOC_GET_CONNECT_FLAGS: {
1019                 tgt = lmv->tgts[0];
1020                 if (tgt == NULL || tgt->ltd_exp == NULL)
1021                         RETURN(-ENODATA);
1022                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1023                 break;
1024         }
1025         case LL_IOC_FID2MDTIDX: {
1026                 struct lu_fid *fid = karg;
1027                 int             mdt_index;
1028
1029                 rc = lmv_fld_lookup(lmv, fid, &mdt_index);
1030                 if (rc != 0)
1031                         RETURN(rc);
1032
1033                 /* Note: this is from llite(see ll_dir_ioctl()), @uarg does not
1034                  * point to user space memory for FID2MDTIDX. */
1035                 *(__u32 *)uarg = mdt_index;
1036                 break;
1037         }
1038         case OBD_IOC_FID2PATH: {
1039                 rc = lmv_fid2path(exp, len, karg, uarg);
1040                 break;
1041         }
1042         case LL_IOC_HSM_STATE_GET:
1043         case LL_IOC_HSM_STATE_SET:
1044         case LL_IOC_HSM_ACTION: {
1045                 struct md_op_data       *op_data = karg;
1046
1047                 tgt = lmv_find_target(lmv, &op_data->op_fid1);
1048                 if (IS_ERR(tgt))
1049                         RETURN(PTR_ERR(tgt));
1050
1051                 if (tgt->ltd_exp == NULL)
1052                         RETURN(-EINVAL);
1053
1054                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1055                 break;
1056         }
1057         case LL_IOC_HSM_PROGRESS: {
1058                 const struct hsm_progress_kernel *hpk = karg;
1059
1060                 tgt = lmv_find_target(lmv, &hpk->hpk_fid);
1061                 if (IS_ERR(tgt))
1062                         RETURN(PTR_ERR(tgt));
1063                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1064                 break;
1065         }
1066         case LL_IOC_HSM_REQUEST: {
1067                 struct hsm_user_request *hur = karg;
1068                 unsigned int reqcount = hur->hur_request.hr_itemcount;
1069
1070                 if (reqcount == 0)
1071                         RETURN(0);
1072
1073                 /* if the request is about a single fid
1074                  * or if there is a single MDS, no need to split
1075                  * the request. */
1076                 if (reqcount == 1 || count == 1) {
1077                         tgt = lmv_find_target(lmv,
1078                                               &hur->hur_user_item[0].hui_fid);
1079                         if (IS_ERR(tgt))
1080                                 RETURN(PTR_ERR(tgt));
1081                         rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1082                 } else {
1083                         /* split fid list to their respective MDS */
1084                         for (i = 0; i < count; i++) {
1085                                 unsigned int            nr, reqlen;
1086                                 int                     rc1;
1087                                 struct hsm_user_request *req;
1088
1089                                 tgt = lmv->tgts[i];
1090                                 if (tgt == NULL || tgt->ltd_exp == NULL)
1091                                         continue;
1092
1093                                 nr = lmv_hsm_req_count(lmv, hur, tgt);
1094                                 if (nr == 0) /* nothing for this MDS */
1095                                         continue;
1096
1097                                 /* build a request with fids for this MDS */
1098                                 reqlen = offsetof(typeof(*hur),
1099                                                   hur_user_item[nr])
1100                                                 + hur->hur_request.hr_data_len;
1101                                 OBD_ALLOC_LARGE(req, reqlen);
1102                                 if (req == NULL)
1103                                         RETURN(-ENOMEM);
1104
1105                                 lmv_hsm_req_build(lmv, hur, tgt, req);
1106
1107                                 rc1 = obd_iocontrol(cmd, tgt->ltd_exp, reqlen,
1108                                                     req, uarg);
1109                                 if (rc1 != 0 && rc == 0)
1110                                         rc = rc1;
1111                                 OBD_FREE_LARGE(req, reqlen);
1112                         }
1113                 }
1114                 break;
1115         }
1116         case LL_IOC_LOV_SWAP_LAYOUTS: {
1117                 struct md_op_data       *op_data = karg;
1118                 struct lmv_tgt_desc     *tgt1, *tgt2;
1119
1120                 tgt1 = lmv_find_target(lmv, &op_data->op_fid1);
1121                 if (IS_ERR(tgt1))
1122                         RETURN(PTR_ERR(tgt1));
1123
1124                 tgt2 = lmv_find_target(lmv, &op_data->op_fid2);
1125                 if (IS_ERR(tgt2))
1126                         RETURN(PTR_ERR(tgt2));
1127
1128                 if ((tgt1->ltd_exp == NULL) || (tgt2->ltd_exp == NULL))
1129                         RETURN(-EINVAL);
1130
1131                 /* only files on same MDT can have their layouts swapped */
1132                 if (tgt1->ltd_idx != tgt2->ltd_idx)
1133                         RETURN(-EPERM);
1134
1135                 rc = obd_iocontrol(cmd, tgt1->ltd_exp, len, karg, uarg);
1136                 break;
1137         }
1138         case LL_IOC_HSM_CT_START: {
1139                 struct lustre_kernelcomm *lk = karg;
1140                 if (lk->lk_flags & LK_FLG_STOP)
1141                         rc = lmv_hsm_ct_unregister(lmv, cmd, len, lk, uarg);
1142                 else
1143                         rc = lmv_hsm_ct_register(lmv, cmd, len, lk, uarg);
1144                 break;
1145         }
1146         default:
1147                 for (i = 0; i < count; i++) {
1148                         struct obd_device *mdc_obd;
1149                         int err;
1150
1151                         tgt = lmv->tgts[i];
1152                         if (tgt == NULL || tgt->ltd_exp == NULL)
1153                                 continue;
1154                         /* ll_umount_begin() sets force flag but for lmv, not
1155                          * mdc. Let's pass it through */
1156                         mdc_obd = class_exp2obd(tgt->ltd_exp);
1157                         mdc_obd->obd_force = obddev->obd_force;
1158                         err = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1159                         if (err) {
1160                                 if (tgt->ltd_active) {
1161                                         CERROR("error: iocontrol MDC %s on MDT"
1162                                                " idx %d cmd %x: err = %d\n",
1163                                                tgt->ltd_uuid.uuid, i, cmd, err);
1164                                         if (!rc)
1165                                                 rc = err;
1166                                 }
1167                         } else
1168                                 set = 1;
1169                 }
1170                 if (!set && !rc)
1171                         rc = -EIO;
1172         }
1173         RETURN(rc);
1174 }
1175
1176 #if 0
1177 static int lmv_all_chars_policy(int count, const char *name,
1178                                 int len)
1179 {
1180         unsigned int c = 0;
1181
1182         while (len > 0)
1183                 c += name[--len];
1184         c = c % count;
1185         return c;
1186 }
1187
1188 static int lmv_nid_policy(struct lmv_obd *lmv)
1189 {
1190         struct obd_import *imp;
1191         __u32              id;
1192
1193         /*
1194          * XXX: To get nid we assume that underlying obd device is mdc.
1195          */
1196         imp = class_exp2cliimp(lmv->tgts[0].ltd_exp);
1197         id = imp->imp_connection->c_self ^ (imp->imp_connection->c_self >> 32);
1198         return id % lmv->desc.ld_tgt_count;
1199 }
1200
1201 static int lmv_choose_mds(struct lmv_obd *lmv, struct md_op_data *op_data,
1202                           placement_policy_t placement)
1203 {
1204         switch (placement) {
1205         case PLACEMENT_CHAR_POLICY:
1206                 return lmv_all_chars_policy(lmv->desc.ld_tgt_count,
1207                                             op_data->op_name,
1208                                             op_data->op_namelen);
1209         case PLACEMENT_NID_POLICY:
1210                 return lmv_nid_policy(lmv);
1211
1212         default:
1213                 break;
1214         }
1215
1216         CERROR("Unsupported placement policy %x\n", placement);
1217         return -EINVAL;
1218 }
1219 #endif
1220
1221 /**
1222  * This is _inode_ placement policy function (not name).
1223  */
1224 static int lmv_placement_policy(struct obd_device *obd,
1225                                 struct md_op_data *op_data, u32 *mds)
1226 {
1227         struct lmv_obd          *lmv = &obd->u.lmv;
1228         ENTRY;
1229
1230         LASSERT(mds != NULL);
1231
1232         if (lmv->desc.ld_tgt_count == 1) {
1233                 *mds = 0;
1234                 RETURN(0);
1235         }
1236
1237         if (op_data->op_default_stripe_offset != -1) {
1238                 *mds = op_data->op_default_stripe_offset;
1239                 RETURN(0);
1240         }
1241
1242         /**
1243          * If stripe_offset is provided during setdirstripe
1244          * (setdirstripe -i xx), xx MDS will be choosen.
1245          */
1246         if (op_data->op_cli_flags & CLI_SET_MEA && op_data->op_data != NULL) {
1247                 struct lmv_user_md *lum;
1248
1249                 lum = op_data->op_data;
1250
1251                 if (le32_to_cpu(lum->lum_stripe_offset) != (__u32)-1) {
1252                         *mds = le32_to_cpu(lum->lum_stripe_offset);
1253                 } else {
1254                         /* -1 means default, which will be in the same MDT with
1255                          * the stripe */
1256                         *mds = op_data->op_mds;
1257                         lum->lum_stripe_offset = cpu_to_le32(op_data->op_mds);
1258                 }
1259         } else {
1260                 /* Allocate new fid on target according to operation type and
1261                  * parent home mds. */
1262                 *mds = op_data->op_mds;
1263         }
1264
1265         RETURN(0);
1266 }
1267
1268 int __lmv_fid_alloc(struct lmv_obd *lmv, struct lu_fid *fid, u32 mds)
1269 {
1270         struct lmv_tgt_desc     *tgt;
1271         int                      rc;
1272         ENTRY;
1273
1274         tgt = lmv_get_target(lmv, mds, NULL);
1275         if (IS_ERR(tgt))
1276                 RETURN(PTR_ERR(tgt));
1277
1278         /*
1279          * New seq alloc and FLD setup should be atomic. Otherwise we may find
1280          * on server that seq in new allocated fid is not yet known.
1281          */
1282         mutex_lock(&tgt->ltd_fid_mutex);
1283
1284         if (tgt->ltd_active == 0 || tgt->ltd_exp == NULL)
1285                 GOTO(out, rc = -ENODEV);
1286
1287         /*
1288          * Asking underlying tgt layer to allocate new fid.
1289          */
1290         rc = obd_fid_alloc(NULL, tgt->ltd_exp, fid, NULL);
1291         if (rc > 0) {
1292                 LASSERT(fid_is_sane(fid));
1293                 rc = 0;
1294         }
1295
1296         EXIT;
1297 out:
1298         mutex_unlock(&tgt->ltd_fid_mutex);
1299         return rc;
1300 }
1301
1302 int lmv_fid_alloc(const struct lu_env *env, struct obd_export *exp,
1303                   struct lu_fid *fid, struct md_op_data *op_data)
1304 {
1305         struct obd_device     *obd = class_exp2obd(exp);
1306         struct lmv_obd        *lmv = &obd->u.lmv;
1307         u32                    mds = 0;
1308         int                    rc;
1309         ENTRY;
1310
1311         LASSERT(op_data != NULL);
1312         LASSERT(fid != NULL);
1313
1314         rc = lmv_placement_policy(obd, op_data, &mds);
1315         if (rc) {
1316                 CERROR("Can't get target for allocating fid, "
1317                        "rc %d\n", rc);
1318                 RETURN(rc);
1319         }
1320
1321         rc = __lmv_fid_alloc(lmv, fid, mds);
1322         if (rc) {
1323                 CERROR("Can't alloc new fid, rc %d\n", rc);
1324                 RETURN(rc);
1325         }
1326
1327         RETURN(rc);
1328 }
1329
1330 static int lmv_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
1331 {
1332         struct lmv_obd  *lmv = &obd->u.lmv;
1333         struct lmv_desc *desc;
1334         int             rc;
1335         ENTRY;
1336
1337         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
1338                 CERROR("LMV setup requires a descriptor\n");
1339                 RETURN(-EINVAL);
1340         }
1341
1342         desc = (struct lmv_desc *)lustre_cfg_buf(lcfg, 1);
1343         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
1344                 CERROR("Lmv descriptor size wrong: %d > %d\n",
1345                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
1346                 RETURN(-EINVAL);
1347         }
1348
1349         lmv->tgts_size = 32U;
1350         OBD_ALLOC(lmv->tgts, sizeof(*lmv->tgts) * lmv->tgts_size);
1351         if (lmv->tgts == NULL)
1352                 RETURN(-ENOMEM);
1353
1354         obd_str2uuid(&lmv->desc.ld_uuid, desc->ld_uuid.uuid);
1355         lmv->desc.ld_tgt_count = 0;
1356         lmv->desc.ld_active_tgt_count = 0;
1357         lmv->max_def_easize = 0;
1358         lmv->max_easize = 0;
1359         lmv->lmv_placement = PLACEMENT_CHAR_POLICY;
1360
1361         spin_lock_init(&lmv->lmv_lock);
1362         mutex_init(&lmv->lmv_init_mutex);
1363
1364 #ifdef CONFIG_PROC_FS
1365         obd->obd_vars = lprocfs_lmv_obd_vars;
1366         lprocfs_obd_setup(obd);
1367         lprocfs_alloc_md_stats(obd, 0);
1368         rc = lprocfs_seq_create(obd->obd_proc_entry, "target_obd",
1369                                 0444, &lmv_proc_target_fops, obd);
1370         if (rc)
1371                 CWARN("%s: error adding LMV target_obd file: rc = %d\n",
1372                       obd->obd_name, rc);
1373 #endif
1374         rc = fld_client_init(&lmv->lmv_fld, obd->obd_name,
1375                              LUSTRE_CLI_FLD_HASH_DHT);
1376         if (rc) {
1377                 CERROR("Can't init FLD, err %d\n", rc);
1378                 GOTO(out, rc);
1379         }
1380
1381         RETURN(0);
1382
1383 out:
1384         return rc;
1385 }
1386
1387 static int lmv_cleanup(struct obd_device *obd)
1388 {
1389         struct lmv_obd   *lmv = &obd->u.lmv;
1390         ENTRY;
1391
1392         fld_client_fini(&lmv->lmv_fld);
1393         if (lmv->tgts != NULL) {
1394                 int i;
1395                 for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1396                         if (lmv->tgts[i] == NULL)
1397                                 continue;
1398                         lmv_del_target(lmv, i);
1399                 }
1400                 OBD_FREE(lmv->tgts, sizeof(*lmv->tgts) * lmv->tgts_size);
1401                 lmv->tgts_size = 0;
1402         }
1403         RETURN(0);
1404 }
1405
1406 static int lmv_process_config(struct obd_device *obd, size_t len, void *buf)
1407 {
1408         struct lustre_cfg       *lcfg = buf;
1409         struct obd_uuid         obd_uuid;
1410         int                     gen;
1411         __u32                   index;
1412         int                     rc;
1413         ENTRY;
1414
1415         switch (lcfg->lcfg_command) {
1416         case LCFG_ADD_MDC:
1417                 /* modify_mdc_tgts add 0:lustre-clilmv  1:lustre-MDT0000_UUID
1418                  * 2:0  3:1  4:lustre-MDT0000-mdc_UUID */
1419                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(obd_uuid.uuid))
1420                         GOTO(out, rc = -EINVAL);
1421
1422                 obd_str2uuid(&obd_uuid,  lustre_cfg_buf(lcfg, 1));
1423
1424                 if (sscanf(lustre_cfg_buf(lcfg, 2), "%u", &index) != 1)
1425                         GOTO(out, rc = -EINVAL);
1426                 if (sscanf(lustre_cfg_buf(lcfg, 3), "%d", &gen) != 1)
1427                         GOTO(out, rc = -EINVAL);
1428                 rc = lmv_add_target(obd, &obd_uuid, index, gen);
1429                 GOTO(out, rc);
1430         default:
1431                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1432                 GOTO(out, rc = -EINVAL);
1433         }
1434 out:
1435         RETURN(rc);
1436 }
1437
1438 static int lmv_statfs(const struct lu_env *env, struct obd_export *exp,
1439                       struct obd_statfs *osfs, __u64 max_age, __u32 flags)
1440 {
1441         struct obd_device       *obd = class_exp2obd(exp);
1442         struct lmv_obd          *lmv = &obd->u.lmv;
1443         struct obd_statfs       *temp;
1444         int                      rc = 0;
1445         __u32                    i;
1446         ENTRY;
1447
1448         rc = lmv_check_connect(obd);
1449         if (rc)
1450                 RETURN(rc);
1451
1452         OBD_ALLOC(temp, sizeof(*temp));
1453         if (temp == NULL)
1454                 RETURN(-ENOMEM);
1455
1456         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1457                 if (lmv->tgts[i] == NULL || lmv->tgts[i]->ltd_exp == NULL)
1458                         continue;
1459
1460                 rc = obd_statfs(env, lmv->tgts[i]->ltd_exp, temp,
1461                                 max_age, flags);
1462                 if (rc) {
1463                         CERROR("can't stat MDS #%d (%s), error %d\n", i,
1464                                lmv->tgts[i]->ltd_exp->exp_obd->obd_name,
1465                                rc);
1466                         GOTO(out_free_temp, rc);
1467                 }
1468
1469                 if (i == 0) {
1470                         *osfs = *temp;
1471                         /* If the statfs is from mount, it will needs
1472                          * retrieve necessary information from MDT0.
1473                          * i.e. mount does not need the merged osfs
1474                          * from all of MDT.
1475                          * And also clients can be mounted as long as
1476                          * MDT0 is in service*/
1477                         if (flags & OBD_STATFS_FOR_MDT0)
1478                                 GOTO(out_free_temp, rc);
1479                 } else {
1480                         osfs->os_bavail += temp->os_bavail;
1481                         osfs->os_blocks += temp->os_blocks;
1482                         osfs->os_ffree += temp->os_ffree;
1483                         osfs->os_files += temp->os_files;
1484                 }
1485         }
1486
1487         EXIT;
1488 out_free_temp:
1489         OBD_FREE(temp, sizeof(*temp));
1490         return rc;
1491 }
1492
1493 static int lmv_getstatus(struct obd_export *exp, struct lu_fid *fid)
1494 {
1495         struct obd_device    *obd = exp->exp_obd;
1496         struct lmv_obd       *lmv = &obd->u.lmv;
1497         int                   rc;
1498         ENTRY;
1499
1500         rc = lmv_check_connect(obd);
1501         if (rc)
1502                 RETURN(rc);
1503
1504         rc = md_getstatus(lmv->tgts[0]->ltd_exp, fid);
1505         RETURN(rc);
1506 }
1507
1508 static int lmv_getxattr(struct obd_export *exp, const struct lu_fid *fid,
1509                         u64 valid, const char *name,
1510                         const char *input, int input_size, int output_size,
1511                         int flags, struct ptlrpc_request **request)
1512 {
1513         struct obd_device      *obd = exp->exp_obd;
1514         struct lmv_obd         *lmv = &obd->u.lmv;
1515         struct lmv_tgt_desc    *tgt;
1516         int                     rc;
1517         ENTRY;
1518
1519         rc = lmv_check_connect(obd);
1520         if (rc)
1521                 RETURN(rc);
1522
1523         tgt = lmv_find_target(lmv, fid);
1524         if (IS_ERR(tgt))
1525                 RETURN(PTR_ERR(tgt));
1526
1527         rc = md_getxattr(tgt->ltd_exp, fid, valid, name, input,
1528                          input_size, output_size, flags, request);
1529
1530         RETURN(rc);
1531 }
1532
1533 static int lmv_setxattr(struct obd_export *exp, const struct lu_fid *fid,
1534                         u64 valid, const char *name,
1535                         const char *input, int input_size, int output_size,
1536                         int flags, __u32 suppgid,
1537                         struct ptlrpc_request **request)
1538 {
1539         struct obd_device      *obd = exp->exp_obd;
1540         struct lmv_obd         *lmv = &obd->u.lmv;
1541         struct lmv_tgt_desc    *tgt;
1542         int                     rc;
1543         ENTRY;
1544
1545         rc = lmv_check_connect(obd);
1546         if (rc)
1547                 RETURN(rc);
1548
1549         tgt = lmv_find_target(lmv, fid);
1550         if (IS_ERR(tgt))
1551                 RETURN(PTR_ERR(tgt));
1552
1553         rc = md_setxattr(tgt->ltd_exp, fid, valid, name, input,
1554                          input_size, output_size, flags, suppgid,
1555                          request);
1556
1557         RETURN(rc);
1558 }
1559
1560 static int lmv_getattr(struct obd_export *exp, struct md_op_data *op_data,
1561                        struct ptlrpc_request **request)
1562 {
1563         struct obd_device       *obd = exp->exp_obd;
1564         struct lmv_obd          *lmv = &obd->u.lmv;
1565         struct lmv_tgt_desc     *tgt;
1566         int                      rc;
1567         ENTRY;
1568
1569         rc = lmv_check_connect(obd);
1570         if (rc)
1571                 RETURN(rc);
1572
1573         tgt = lmv_find_target(lmv, &op_data->op_fid1);
1574         if (IS_ERR(tgt))
1575                 RETURN(PTR_ERR(tgt));
1576
1577         if (op_data->op_flags & MF_GET_MDT_IDX) {
1578                 op_data->op_mds = tgt->ltd_idx;
1579                 RETURN(0);
1580         }
1581
1582         rc = md_getattr(tgt->ltd_exp, op_data, request);
1583
1584         RETURN(rc);
1585 }
1586
1587 static int lmv_null_inode(struct obd_export *exp, const struct lu_fid *fid)
1588 {
1589         struct obd_device   *obd = exp->exp_obd;
1590         struct lmv_obd      *lmv = &obd->u.lmv;
1591         __u32                i;
1592         int                  rc;
1593         ENTRY;
1594
1595         rc = lmv_check_connect(obd);
1596         if (rc)
1597                 RETURN(rc);
1598
1599         CDEBUG(D_INODE, "CBDATA for "DFID"\n", PFID(fid));
1600
1601         /*
1602          * With DNE every object can have two locks in different namespaces:
1603          * lookup lock in space of MDT storing direntry and update/open lock in
1604          * space of MDT storing inode.
1605          */
1606         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1607                 if (lmv->tgts[i] == NULL || lmv->tgts[i]->ltd_exp == NULL)
1608                         continue;
1609                 md_null_inode(lmv->tgts[i]->ltd_exp, fid);
1610         }
1611
1612         RETURN(0);
1613 }
1614
1615 static int lmv_find_cbdata(struct obd_export *exp, const struct lu_fid *fid,
1616                            ldlm_iterator_t it, void *data)
1617 {
1618         struct obd_device       *obd = exp->exp_obd;
1619         struct lmv_obd          *lmv = &obd->u.lmv;
1620         int                     i;
1621         int                     tgt;
1622         int                     rc;
1623         ENTRY;
1624
1625         rc = lmv_check_connect(obd);
1626         if (rc)
1627                 RETURN(rc);
1628
1629         CDEBUG(D_INODE, "CBDATA for "DFID"\n", PFID(fid));
1630
1631         /*
1632          * With DNE every object can have two locks in different namespaces:
1633          * lookup lock in space of MDT storing direntry and update/open lock in
1634          * space of MDT storing inode.  Try the MDT that the FID maps to first,
1635          * since this can be easily found, and only try others if that fails.
1636          */
1637         for (i = 0, tgt = lmv_find_target_index(lmv, fid);
1638              i < lmv->desc.ld_tgt_count;
1639              i++, tgt = (tgt + 1) % lmv->desc.ld_tgt_count) {
1640                 if (tgt < 0) {
1641                         CDEBUG(D_HA, "%s: "DFID" is inaccessible: rc = %d\n",
1642                                obd->obd_name, PFID(fid), tgt);
1643                         tgt = 0;
1644                 }
1645
1646                 if (lmv->tgts[tgt] == NULL ||
1647                     lmv->tgts[tgt]->ltd_exp == NULL)
1648                         continue;
1649
1650                 rc = md_find_cbdata(lmv->tgts[tgt]->ltd_exp, fid, it, data);
1651                 if (rc)
1652                         RETURN(rc);
1653         }
1654
1655         RETURN(rc);
1656 }
1657
1658
1659 static int lmv_close(struct obd_export *exp, struct md_op_data *op_data,
1660                      struct md_open_data *mod, struct ptlrpc_request **request)
1661 {
1662         struct obd_device     *obd = exp->exp_obd;
1663         struct lmv_obd        *lmv = &obd->u.lmv;
1664         struct lmv_tgt_desc   *tgt;
1665         int                    rc;
1666         ENTRY;
1667
1668         rc = lmv_check_connect(obd);
1669         if (rc)
1670                 RETURN(rc);
1671
1672         tgt = lmv_find_target(lmv, &op_data->op_fid1);
1673         if (IS_ERR(tgt))
1674                 RETURN(PTR_ERR(tgt));
1675
1676         CDEBUG(D_INODE, "CLOSE "DFID"\n", PFID(&op_data->op_fid1));
1677         rc = md_close(tgt->ltd_exp, op_data, mod, request);
1678         RETURN(rc);
1679 }
1680
1681 /**
1682  * Choosing the MDT by name or FID in @op_data.
1683  * For non-striped directory, it will locate MDT by fid.
1684  * For striped-directory, it will locate MDT by name. And also
1685  * it will reset op_fid1 with the FID of the choosen stripe.
1686  **/
1687 struct lmv_tgt_desc *
1688 lmv_locate_target_for_name(struct lmv_obd *lmv, struct lmv_stripe_md *lsm,
1689                            const char *name, int namelen, struct lu_fid *fid,
1690                            u32 *mds)
1691 {
1692         struct lmv_tgt_desc     *tgt;
1693         const struct lmv_oinfo  *oinfo;
1694
1695         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_BAD_NAME_HASH)) {
1696                 if (cfs_fail_val >= lsm->lsm_md_stripe_count)
1697                         RETURN(ERR_PTR(-EBADF));
1698                 oinfo = &lsm->lsm_md_oinfo[cfs_fail_val];
1699         } else {
1700                 oinfo = lsm_name_to_stripe_info(lsm, name, namelen);
1701                 if (IS_ERR(oinfo))
1702                         RETURN(ERR_CAST(oinfo));
1703         }
1704
1705         if (fid != NULL)
1706                 *fid = oinfo->lmo_fid;
1707         if (mds != NULL)
1708                 *mds = oinfo->lmo_mds;
1709
1710         tgt = lmv_get_target(lmv, oinfo->lmo_mds, NULL);
1711
1712         CDEBUG(D_INFO, "locate on mds %u "DFID"\n", oinfo->lmo_mds,
1713                PFID(&oinfo->lmo_fid));
1714         return tgt;
1715 }
1716
1717 /**
1718  * Locate mds by fid or name
1719  *
1720  * For striped directory (lsm != NULL), it will locate the stripe
1721  * by name hash (see lsm_name_to_stripe_info()). Note: if the hash_type
1722  * is unknown, it will return -EBADFD, and lmv_intent_lookup might need
1723  * walk through all of stripes to locate the entry.
1724  *
1725  * For normal direcotry, it will locate MDS by FID directly.
1726  * \param[in] lmv       LMV device
1727  * \param[in] op_data   client MD stack parameters, name, namelen
1728  *                      mds_num etc.
1729  * \param[in] fid       object FID used to locate MDS.
1730  *
1731  * retval               pointer to the lmv_tgt_desc if succeed.
1732  *                      ERR_PTR(errno) if failed.
1733  */
1734 struct lmv_tgt_desc*
1735 lmv_locate_mds(struct lmv_obd *lmv, struct md_op_data *op_data,
1736                struct lu_fid *fid)
1737 {
1738         struct lmv_stripe_md    *lsm = op_data->op_mea1;
1739         struct lmv_tgt_desc     *tgt;
1740
1741         /* During creating VOLATILE file, it should honor the mdt
1742          * index if the file under striped dir is being restored, see
1743          * ct_restore(). */
1744         if (op_data->op_bias & MDS_CREATE_VOLATILE &&
1745             (int)op_data->op_mds != -1 && lsm != NULL) {
1746                 int i;
1747                 tgt = lmv_get_target(lmv, op_data->op_mds, NULL);
1748                 if (IS_ERR(tgt))
1749                         return tgt;
1750
1751                 /* refill the right parent fid */
1752                 for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
1753                         struct lmv_oinfo *oinfo;
1754
1755                         oinfo = &lsm->lsm_md_oinfo[i];
1756                         if (oinfo->lmo_mds == op_data->op_mds) {
1757                                 *fid = oinfo->lmo_fid;
1758                                 break;
1759                         }
1760                 }
1761
1762                 /* Hmm, can not find the stripe by mdt_index(op_mds) */
1763                 if (i == lsm->lsm_md_stripe_count)
1764                         tgt = ERR_PTR(-EINVAL);
1765
1766                 return tgt;
1767         }
1768
1769         if (lsm == NULL || op_data->op_namelen == 0) {
1770                 tgt = lmv_find_target(lmv, fid);
1771                 if (IS_ERR(tgt))
1772                         return tgt;
1773
1774                 op_data->op_mds = tgt->ltd_idx;
1775                 return tgt;
1776         }
1777
1778         return lmv_locate_target_for_name(lmv, lsm, op_data->op_name,
1779                                           op_data->op_namelen, fid,
1780                                           &op_data->op_mds);
1781 }
1782
1783 int lmv_create(struct obd_export *exp, struct md_op_data *op_data,
1784                 const void *data, size_t datalen, umode_t mode, uid_t uid,
1785                 gid_t gid, cfs_cap_t cap_effective, __u64 rdev,
1786                 struct ptlrpc_request **request)
1787 {
1788         struct obd_device       *obd = exp->exp_obd;
1789         struct lmv_obd          *lmv = &obd->u.lmv;
1790         struct lmv_tgt_desc     *tgt;
1791         int                      rc;
1792         ENTRY;
1793
1794         rc = lmv_check_connect(obd);
1795         if (rc)
1796                 RETURN(rc);
1797
1798         if (!lmv->desc.ld_active_tgt_count)
1799                 RETURN(-EIO);
1800
1801         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
1802         if (IS_ERR(tgt))
1803                 RETURN(PTR_ERR(tgt));
1804
1805         CDEBUG(D_INODE, "CREATE name '%.*s' on "DFID" -> mds #%x\n",
1806                 (int)op_data->op_namelen, op_data->op_name,
1807                 PFID(&op_data->op_fid1), op_data->op_mds);
1808
1809         rc = lmv_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
1810         if (rc)
1811                 RETURN(rc);
1812         if (exp_connect_flags(exp) & OBD_CONNECT_DIR_STRIPE) {
1813                 /* Send the create request to the MDT where the object
1814                  * will be located */
1815                 tgt = lmv_find_target(lmv, &op_data->op_fid2);
1816                 if (IS_ERR(tgt))
1817                         RETURN(PTR_ERR(tgt));
1818
1819                 op_data->op_mds = tgt->ltd_idx;
1820         } else {
1821                 CDEBUG(D_CONFIG, "Server doesn't support striped dirs\n");
1822         }
1823
1824         CDEBUG(D_INODE, "CREATE obj "DFID" -> mds #%x\n",
1825                PFID(&op_data->op_fid2), op_data->op_mds);
1826
1827         op_data->op_flags |= MF_MDC_CANCEL_FID1;
1828         rc = md_create(tgt->ltd_exp, op_data, data, datalen, mode, uid, gid,
1829                        cap_effective, rdev, request);
1830         if (rc == 0) {
1831                 if (*request == NULL)
1832                         RETURN(rc);
1833                 CDEBUG(D_INODE, "Created - "DFID"\n", PFID(&op_data->op_fid2));
1834         }
1835         RETURN(rc);
1836 }
1837
1838 static int
1839 lmv_enqueue(struct obd_export *exp, struct ldlm_enqueue_info *einfo,
1840             const union ldlm_policy_data *policy,
1841             struct lookup_intent *it, struct md_op_data *op_data,
1842             struct lustre_handle *lockh, __u64 extra_lock_flags)
1843 {
1844         struct obd_device        *obd = exp->exp_obd;
1845         struct lmv_obd           *lmv = &obd->u.lmv;
1846         struct lmv_tgt_desc      *tgt;
1847         int                       rc;
1848         ENTRY;
1849
1850         rc = lmv_check_connect(obd);
1851         if (rc)
1852                 RETURN(rc);
1853
1854         CDEBUG(D_INODE, "ENQUEUE '%s' on "DFID"\n",
1855                LL_IT2STR(it), PFID(&op_data->op_fid1));
1856
1857         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
1858         if (IS_ERR(tgt))
1859                 RETURN(PTR_ERR(tgt));
1860
1861         CDEBUG(D_INODE, "ENQUEUE '%s' on "DFID" -> mds #%u\n",
1862                LL_IT2STR(it), PFID(&op_data->op_fid1), tgt->ltd_idx);
1863
1864         rc = md_enqueue(tgt->ltd_exp, einfo, policy, it, op_data, lockh,
1865                         extra_lock_flags);
1866
1867         RETURN(rc);
1868 }
1869
1870 static int
1871 lmv_getattr_name(struct obd_export *exp,struct md_op_data *op_data,
1872                  struct ptlrpc_request **preq)
1873 {
1874         struct ptlrpc_request   *req = NULL;
1875         struct obd_device       *obd = exp->exp_obd;
1876         struct lmv_obd          *lmv = &obd->u.lmv;
1877         struct lmv_tgt_desc     *tgt;
1878         struct mdt_body         *body;
1879         int                      rc;
1880         ENTRY;
1881
1882         rc = lmv_check_connect(obd);
1883         if (rc)
1884                 RETURN(rc);
1885
1886         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
1887         if (IS_ERR(tgt))
1888                 RETURN(PTR_ERR(tgt));
1889
1890         CDEBUG(D_INODE, "GETATTR_NAME for %*s on "DFID" -> mds #%d\n",
1891                 (int)op_data->op_namelen, op_data->op_name,
1892                 PFID(&op_data->op_fid1), tgt->ltd_idx);
1893
1894         rc = md_getattr_name(tgt->ltd_exp, op_data, preq);
1895         if (rc != 0)
1896                 RETURN(rc);
1897
1898         body = req_capsule_server_get(&(*preq)->rq_pill, &RMF_MDT_BODY);
1899         LASSERT(body != NULL);
1900
1901         if (body->mbo_valid & OBD_MD_MDS) {
1902                 struct lu_fid rid = body->mbo_fid1;
1903                 CDEBUG(D_INODE, "Request attrs for "DFID"\n",
1904                        PFID(&rid));
1905
1906                 tgt = lmv_find_target(lmv, &rid);
1907                 if (IS_ERR(tgt)) {
1908                         ptlrpc_req_finished(*preq);
1909                         preq = NULL;
1910                         RETURN(PTR_ERR(tgt));
1911                 }
1912
1913                 op_data->op_fid1 = rid;
1914                 op_data->op_valid |= OBD_MD_FLCROSSREF;
1915                 op_data->op_namelen = 0;
1916                 op_data->op_name = NULL;
1917                 rc = md_getattr_name(tgt->ltd_exp, op_data, &req);
1918                 ptlrpc_req_finished(*preq);
1919                 *preq = req;
1920         }
1921
1922         RETURN(rc);
1923 }
1924
1925 #define md_op_data_fid(op_data, fl)                     \
1926         (fl == MF_MDC_CANCEL_FID1 ? &op_data->op_fid1 : \
1927          fl == MF_MDC_CANCEL_FID2 ? &op_data->op_fid2 : \
1928          fl == MF_MDC_CANCEL_FID3 ? &op_data->op_fid3 : \
1929          fl == MF_MDC_CANCEL_FID4 ? &op_data->op_fid4 : \
1930          NULL)
1931
1932 static int lmv_early_cancel(struct obd_export *exp, struct lmv_tgt_desc *tgt,
1933                             struct md_op_data *op_data, __u32 op_tgt,
1934                             enum ldlm_mode mode, int bits, int flag)
1935 {
1936         struct lu_fid *fid = md_op_data_fid(op_data, flag);
1937         struct lmv_obd *lmv = &exp->exp_obd->u.lmv;
1938         union ldlm_policy_data policy = { { 0 } };
1939         int rc = 0;
1940         ENTRY;
1941
1942         if (!fid_is_sane(fid))
1943                 RETURN(0);
1944
1945         if (tgt == NULL) {
1946                 tgt = lmv_find_target(lmv, fid);
1947                 if (IS_ERR(tgt))
1948                         RETURN(PTR_ERR(tgt));
1949         }
1950
1951         if (tgt->ltd_idx != op_tgt) {
1952                 CDEBUG(D_INODE, "EARLY_CANCEL on "DFID"\n", PFID(fid));
1953                 policy.l_inodebits.bits = bits;
1954                 rc = md_cancel_unused(tgt->ltd_exp, fid, &policy,
1955                                       mode, LCF_ASYNC, NULL);
1956         } else {
1957                 CDEBUG(D_INODE,
1958                        "EARLY_CANCEL skip operation target %d on "DFID"\n",
1959                        op_tgt, PFID(fid));
1960                 op_data->op_flags |= flag;
1961                 rc = 0;
1962         }
1963
1964         RETURN(rc);
1965 }
1966
1967 /*
1968  * llite passes fid of an target inode in op_data->op_fid1 and id of directory in
1969  * op_data->op_fid2
1970  */
1971 static int lmv_link(struct obd_export *exp, struct md_op_data *op_data,
1972                     struct ptlrpc_request **request)
1973 {
1974         struct obd_device       *obd = exp->exp_obd;
1975         struct lmv_obd          *lmv = &obd->u.lmv;
1976         struct lmv_tgt_desc     *tgt;
1977         int                      rc;
1978         ENTRY;
1979
1980         rc = lmv_check_connect(obd);
1981         if (rc)
1982                 RETURN(rc);
1983
1984         LASSERT(op_data->op_namelen != 0);
1985
1986         CDEBUG(D_INODE, "LINK "DFID":%*s to "DFID"\n",
1987                PFID(&op_data->op_fid2), (int)op_data->op_namelen,
1988                op_data->op_name, PFID(&op_data->op_fid1));
1989
1990         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
1991         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
1992         op_data->op_cap = cfs_curproc_cap_pack();
1993         if (op_data->op_mea2 != NULL) {
1994                 struct lmv_stripe_md    *lsm = op_data->op_mea2;
1995                 const struct lmv_oinfo  *oinfo;
1996
1997                 oinfo = lsm_name_to_stripe_info(lsm, op_data->op_name,
1998                                                 op_data->op_namelen);
1999                 if (IS_ERR(oinfo))
2000                         RETURN(PTR_ERR(oinfo));
2001
2002                 op_data->op_fid2 = oinfo->lmo_fid;
2003         }
2004
2005         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid2);
2006         if (IS_ERR(tgt))
2007                 RETURN(PTR_ERR(tgt));
2008
2009         /*
2010          * Cancel UPDATE lock on child (fid1).
2011          */
2012         op_data->op_flags |= MF_MDC_CANCEL_FID2;
2013         rc = lmv_early_cancel(exp, NULL, op_data, tgt->ltd_idx, LCK_EX,
2014                               MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID1);
2015         if (rc != 0)
2016                 RETURN(rc);
2017
2018         rc = md_link(tgt->ltd_exp, op_data, request);
2019
2020         RETURN(rc);
2021 }
2022
2023 static int lmv_rename(struct obd_export *exp, struct md_op_data *op_data,
2024                       const char *old, size_t oldlen,
2025                       const char *new, size_t newlen,
2026                       struct ptlrpc_request **request)
2027 {
2028         struct obd_device       *obd = exp->exp_obd;
2029         struct lmv_obd          *lmv = &obd->u.lmv;
2030         struct lmv_tgt_desc     *src_tgt;
2031         struct lmv_tgt_desc     *tgt_tgt;
2032         struct obd_export       *target_exp;
2033         struct mdt_body         *body;
2034         int                     rc;
2035         ENTRY;
2036
2037         LASSERT(oldlen != 0);
2038
2039         CDEBUG(D_INODE, "RENAME %.*s in "DFID":%d to %.*s in "DFID":%d\n",
2040                (int)oldlen, old, PFID(&op_data->op_fid1),
2041                op_data->op_mea1 ? op_data->op_mea1->lsm_md_stripe_count : 0,
2042                (int)newlen, new, PFID(&op_data->op_fid2),
2043                op_data->op_mea2 ? op_data->op_mea2->lsm_md_stripe_count : 0);
2044
2045         rc = lmv_check_connect(obd);
2046         if (rc)
2047                 RETURN(rc);
2048
2049         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2050         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2051         op_data->op_cap = cfs_curproc_cap_pack();
2052         if (op_data->op_cli_flags & CLI_MIGRATE) {
2053                 LASSERTF(fid_is_sane(&op_data->op_fid3), "invalid FID "DFID"\n",
2054                          PFID(&op_data->op_fid3));
2055
2056                 if (op_data->op_mea1 != NULL) {
2057                         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2058                         struct lmv_tgt_desc     *tmp;
2059
2060                         /* Fix the parent fid for striped dir */
2061                         tmp = lmv_locate_target_for_name(lmv, lsm, old,
2062                                                          oldlen,
2063                                                          &op_data->op_fid1,
2064                                                          NULL);
2065                         if (IS_ERR(tmp))
2066                                 RETURN(PTR_ERR(tmp));
2067                 }
2068
2069                 rc = lmv_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
2070                 if (rc != 0)
2071                         RETURN(rc);
2072
2073                 src_tgt = lmv_find_target(lmv, &op_data->op_fid3);
2074                 if (IS_ERR(src_tgt))
2075                         RETURN(PTR_ERR(src_tgt));
2076
2077                 target_exp = src_tgt->ltd_exp;
2078         } else {
2079                 if (op_data->op_mea1 != NULL) {
2080                         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2081
2082                         src_tgt = lmv_locate_target_for_name(lmv, lsm, old,
2083                                                              oldlen,
2084                                                              &op_data->op_fid1,
2085                                                              &op_data->op_mds);
2086                 } else {
2087                         src_tgt = lmv_find_target(lmv, &op_data->op_fid1);
2088                 }
2089                 if (IS_ERR(src_tgt))
2090                         RETURN(PTR_ERR(src_tgt));
2091
2092
2093                 if (op_data->op_mea2 != NULL) {
2094                         struct lmv_stripe_md    *lsm = op_data->op_mea2;
2095
2096                         tgt_tgt = lmv_locate_target_for_name(lmv, lsm, new,
2097                                                              newlen,
2098                                                              &op_data->op_fid2,
2099                                                              &op_data->op_mds);
2100                 } else {
2101                         tgt_tgt = lmv_find_target(lmv, &op_data->op_fid2);
2102
2103                 }
2104                 if (IS_ERR(tgt_tgt))
2105                         RETURN(PTR_ERR(tgt_tgt));
2106
2107                 target_exp = tgt_tgt->ltd_exp;
2108         }
2109
2110         /*
2111          * LOOKUP lock on src child (fid3) should also be cancelled for
2112          * src_tgt in mdc_rename.
2113          */
2114         op_data->op_flags |= MF_MDC_CANCEL_FID1 | MF_MDC_CANCEL_FID3;
2115
2116         /*
2117          * Cancel UPDATE locks on tgt parent (fid2), tgt_tgt is its
2118          * own target.
2119          */
2120         rc = lmv_early_cancel(exp, NULL, op_data, src_tgt->ltd_idx,
2121                               LCK_EX, MDS_INODELOCK_UPDATE,
2122                               MF_MDC_CANCEL_FID2);
2123
2124         if (rc != 0)
2125                 RETURN(rc);
2126         /*
2127          * Cancel LOOKUP locks on source child (fid3) for parent tgt_tgt.
2128          */
2129         if (fid_is_sane(&op_data->op_fid3)) {
2130                 struct lmv_tgt_desc *tgt;
2131
2132                 tgt = lmv_find_target(lmv, &op_data->op_fid1);
2133                 if (IS_ERR(tgt))
2134                         RETURN(PTR_ERR(tgt));
2135
2136                 /* Cancel LOOKUP lock on its parent */
2137                 rc = lmv_early_cancel(exp, tgt, op_data, src_tgt->ltd_idx,
2138                                       LCK_EX, MDS_INODELOCK_LOOKUP,
2139                                       MF_MDC_CANCEL_FID3);
2140                 if (rc != 0)
2141                         RETURN(rc);
2142
2143                 rc = lmv_early_cancel(exp, NULL, op_data, src_tgt->ltd_idx,
2144                                       LCK_EX, MDS_INODELOCK_FULL,
2145                                       MF_MDC_CANCEL_FID3);
2146                 if (rc != 0)
2147                         RETURN(rc);
2148         }
2149
2150 retry_rename:
2151         /*
2152          * Cancel all the locks on tgt child (fid4).
2153          */
2154         if (fid_is_sane(&op_data->op_fid4)) {
2155                 struct lmv_tgt_desc *tgt;
2156
2157                 rc = lmv_early_cancel(exp, NULL, op_data, src_tgt->ltd_idx,
2158                                       LCK_EX, MDS_INODELOCK_FULL,
2159                                       MF_MDC_CANCEL_FID4);
2160                 if (rc != 0)
2161                         RETURN(rc);
2162
2163                 tgt = lmv_find_target(lmv, &op_data->op_fid4);
2164                 if (IS_ERR(tgt))
2165                         RETURN(PTR_ERR(tgt));
2166
2167                 /* Since the target child might be destroyed, and it might
2168                  * become orphan, and we can only check orphan on the local
2169                  * MDT right now, so we send rename request to the MDT where
2170                  * target child is located. If target child does not exist,
2171                  * then it will send the request to the target parent */
2172                 target_exp = tgt->ltd_exp;
2173         }
2174
2175         rc = md_rename(target_exp, op_data, old, oldlen, new, newlen,
2176                        request);
2177
2178         if (rc != 0 && rc != -EXDEV)
2179                 RETURN(rc);
2180
2181         body = req_capsule_server_get(&(*request)->rq_pill, &RMF_MDT_BODY);
2182         if (body == NULL)
2183                 RETURN(-EPROTO);
2184
2185         /* Not cross-ref case, just get out of here. */
2186         if (likely(!(body->mbo_valid & OBD_MD_MDS)))
2187                 RETURN(rc);
2188
2189         CDEBUG(D_INODE, "%s: try rename to another MDT for "DFID"\n",
2190                exp->exp_obd->obd_name, PFID(&body->mbo_fid1));
2191
2192         op_data->op_fid4 = body->mbo_fid1;
2193         ptlrpc_req_finished(*request);
2194         *request = NULL;
2195         goto retry_rename;
2196 }
2197
2198 static int lmv_setattr(struct obd_export *exp, struct md_op_data *op_data,
2199                        void *ea, size_t ealen, struct ptlrpc_request **request)
2200 {
2201         struct obd_device       *obd = exp->exp_obd;
2202         struct lmv_obd          *lmv = &obd->u.lmv;
2203         struct lmv_tgt_desc     *tgt;
2204         int                      rc = 0;
2205         ENTRY;
2206
2207         rc = lmv_check_connect(obd);
2208         if (rc)
2209                 RETURN(rc);
2210
2211         CDEBUG(D_INODE, "SETATTR for "DFID", valid 0x%x\n",
2212                PFID(&op_data->op_fid1), op_data->op_attr.ia_valid);
2213
2214         op_data->op_flags |= MF_MDC_CANCEL_FID1;
2215         tgt = lmv_find_target(lmv, &op_data->op_fid1);
2216         if (IS_ERR(tgt))
2217                 RETURN(PTR_ERR(tgt));
2218
2219         rc = md_setattr(tgt->ltd_exp, op_data, ea, ealen, request);
2220
2221         RETURN(rc);
2222 }
2223
2224 static int lmv_fsync(struct obd_export *exp, const struct lu_fid *fid,
2225                      struct ptlrpc_request **request)
2226 {
2227         struct obd_device       *obd = exp->exp_obd;
2228         struct lmv_obd          *lmv = &obd->u.lmv;
2229         struct lmv_tgt_desc     *tgt;
2230         int                      rc;
2231         ENTRY;
2232
2233         rc = lmv_check_connect(obd);
2234         if (rc != 0)
2235                 RETURN(rc);
2236
2237         tgt = lmv_find_target(lmv, fid);
2238         if (IS_ERR(tgt))
2239                 RETURN(PTR_ERR(tgt));
2240
2241         rc = md_fsync(tgt->ltd_exp, fid, request);
2242         RETURN(rc);
2243 }
2244
2245 /**
2246  * Get current minimum entry from striped directory
2247  *
2248  * This function will search the dir entry, whose hash value is the
2249  * closest(>=) to @hash_offset, from all of sub-stripes, and it is
2250  * only being called for striped directory.
2251  *
2252  * \param[in] exp               export of LMV
2253  * \param[in] op_data           parameters transferred beween client MD stack
2254  *                              stripe_information will be included in this
2255  *                              parameter
2256  * \param[in] cb_op             ldlm callback being used in enqueue in
2257  *                              mdc_read_page
2258  * \param[in] hash_offset       the hash value, which is used to locate
2259  *                              minum(closet) dir entry
2260  * \param[in|out] stripe_offset the caller use this to indicate the stripe
2261  *                              index of last entry, so to avoid hash conflict
2262  *                              between stripes. It will also be used to
2263  *                              return the stripe index of current dir entry.
2264  * \param[in|out] entp          the minum entry and it also is being used
2265  *                              to input the last dir entry to resolve the
2266  *                              hash conflict
2267  *
2268  * \param[out] ppage            the page which holds the minum entry
2269  *
2270  * \retval                      = 0 get the entry successfully
2271  *                              negative errno (< 0) does not get the entry
2272  */
2273 static int lmv_get_min_striped_entry(struct obd_export *exp,
2274                                      struct md_op_data *op_data,
2275                                      struct md_callback *cb_op,
2276                                      __u64 hash_offset, int *stripe_offset,
2277                                      struct lu_dirent **entp,
2278                                      struct page **ppage)
2279 {
2280         struct obd_device       *obd = exp->exp_obd;
2281         struct lmv_obd          *lmv = &obd->u.lmv;
2282         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2283         struct lmv_tgt_desc     *tgt;
2284         int                     stripe_count;
2285         struct lu_dirent        *min_ent = NULL;
2286         struct page             *min_page = NULL;
2287         int                     min_idx = 0;
2288         int                     i;
2289         int                     rc = 0;
2290         ENTRY;
2291
2292         stripe_count = lsm->lsm_md_stripe_count;
2293         for (i = 0; i < stripe_count; i++) {
2294                 struct lu_dirent        *ent = NULL;
2295                 struct page             *page = NULL;
2296                 struct lu_dirpage       *dp;
2297                 __u64                   stripe_hash = hash_offset;
2298
2299                 tgt = lmv_get_target(lmv, lsm->lsm_md_oinfo[i].lmo_mds, NULL);
2300                 if (IS_ERR(tgt))
2301                         GOTO(out, rc = PTR_ERR(tgt));
2302
2303                 /* op_data will be shared by each stripe, so we need
2304                  * reset these value for each stripe */
2305                 op_data->op_fid1 = lsm->lsm_md_oinfo[i].lmo_fid;
2306                 op_data->op_fid2 = lsm->lsm_md_oinfo[i].lmo_fid;
2307                 op_data->op_data = lsm->lsm_md_oinfo[i].lmo_root;
2308 next:
2309                 rc = md_read_page(tgt->ltd_exp, op_data, cb_op, stripe_hash,
2310                                   &page);
2311                 if (rc != 0)
2312                         GOTO(out, rc);
2313
2314                 dp = page_address(page);
2315                 for (ent = lu_dirent_start(dp); ent != NULL;
2316                      ent = lu_dirent_next(ent)) {
2317                         /* Skip dummy entry */
2318                         if (le16_to_cpu(ent->lde_namelen) == 0)
2319                                 continue;
2320
2321                         if (le64_to_cpu(ent->lde_hash) < hash_offset)
2322                                 continue;
2323
2324                         if (le64_to_cpu(ent->lde_hash) == hash_offset &&
2325                             (*entp == ent || i < *stripe_offset))
2326                                 continue;
2327
2328                         /* skip . and .. for other stripes */
2329                         if (i != 0 &&
2330                             (strncmp(ent->lde_name, ".",
2331                                      le16_to_cpu(ent->lde_namelen)) == 0 ||
2332                              strncmp(ent->lde_name, "..",
2333                                      le16_to_cpu(ent->lde_namelen)) == 0))
2334                                 continue;
2335                         break;
2336                 }
2337
2338                 if (ent == NULL) {
2339                         stripe_hash = le64_to_cpu(dp->ldp_hash_end);
2340
2341                         kunmap(page);
2342                         page_cache_release(page);
2343                         page = NULL;
2344
2345                         /* reach the end of current stripe, go to next stripe */
2346                         if (stripe_hash == MDS_DIR_END_OFF)
2347                                 continue;
2348                         else
2349                                 goto next;
2350                 }
2351
2352                 if (min_ent != NULL) {
2353                         if (le64_to_cpu(min_ent->lde_hash) >
2354                             le64_to_cpu(ent->lde_hash)) {
2355                                 min_ent = ent;
2356                                 kunmap(min_page);
2357                                 page_cache_release(min_page);
2358                                 min_idx = i;
2359                                 min_page = page;
2360                         } else {
2361                                 kunmap(page);
2362                                 page_cache_release(page);
2363                                 page = NULL;
2364                         }
2365                 } else {
2366                         min_ent = ent;
2367                         min_page = page;
2368                         min_idx = i;
2369                 }
2370         }
2371
2372 out:
2373         if (*ppage != NULL) {
2374                 kunmap(*ppage);
2375                 page_cache_release(*ppage);
2376         }
2377         *stripe_offset = min_idx;
2378         *entp = min_ent;
2379         *ppage = min_page;
2380         RETURN(rc);
2381 }
2382
2383 /**
2384  * Build dir entry page from a striped directory
2385  *
2386  * This function gets one entry by @offset from a striped directory. It will
2387  * read entries from all of stripes, and choose one closest to the required
2388  * offset(&offset). A few notes
2389  * 1. skip . and .. for non-zero stripes, because there can only have one .
2390  * and .. in a directory.
2391  * 2. op_data will be shared by all of stripes, instead of allocating new
2392  * one, so need to restore before reusing.
2393  * 3. release the entry page if that is not being chosen.
2394  *
2395  * \param[in] exp       obd export refer to LMV
2396  * \param[in] op_data   hold those MD parameters of read_entry
2397  * \param[in] cb_op     ldlm callback being used in enqueue in mdc_read_entry
2398  * \param[out] ldp      the entry being read
2399  * \param[out] ppage    the page holding the entry. Note: because the entry
2400  *                      will be accessed in upper layer, so we need hold the
2401  *                      page until the usages of entry is finished, see
2402  *                      ll_dir_entry_next.
2403  *
2404  * retval               =0 if get entry successfully
2405  *                      <0 cannot get entry
2406  */
2407 static int lmv_read_striped_page(struct obd_export *exp,
2408                                  struct md_op_data *op_data,
2409                                  struct md_callback *cb_op,
2410                                  __u64 offset, struct page **ppage)
2411 {
2412         struct obd_device       *obd = exp->exp_obd;
2413         struct lu_fid           master_fid = op_data->op_fid1;
2414         struct inode            *master_inode = op_data->op_data;
2415         __u64                   hash_offset = offset;
2416         struct lu_dirpage       *dp;
2417         struct page             *min_ent_page = NULL;
2418         struct page             *ent_page = NULL;
2419         struct lu_dirent        *ent;
2420         void                    *area;
2421         int                     ent_idx = 0;
2422         struct lu_dirent        *min_ent = NULL;
2423         struct lu_dirent        *last_ent;
2424         size_t                  left_bytes;
2425         int                     rc;
2426         ENTRY;
2427
2428         rc = lmv_check_connect(obd);
2429         if (rc)
2430                 RETURN(rc);
2431
2432         /* Allocate a page and read entries from all of stripes and fill
2433          * the page by hash order */
2434         ent_page = alloc_page(GFP_KERNEL);
2435         if (ent_page == NULL)
2436                 RETURN(-ENOMEM);
2437
2438         /* Initialize the entry page */
2439         dp = kmap(ent_page);
2440         memset(dp, 0, sizeof(*dp));
2441         dp->ldp_hash_start = cpu_to_le64(offset);
2442         dp->ldp_flags |= LDF_COLLIDE;
2443
2444         area = dp + 1;
2445         left_bytes = PAGE_CACHE_SIZE - sizeof(*dp);
2446         ent = area;
2447         last_ent = ent;
2448         do {
2449                 __u16   ent_size;
2450
2451                 /* Find the minum entry from all sub-stripes */
2452                 rc = lmv_get_min_striped_entry(exp, op_data, cb_op, hash_offset,
2453                                                &ent_idx, &min_ent,
2454                                                &min_ent_page);
2455                 if (rc != 0)
2456                         GOTO(out, rc);
2457
2458                 /* If it can not get minum entry, it means it already reaches
2459                  * the end of this directory */
2460                 if (min_ent == NULL) {
2461                         last_ent->lde_reclen = 0;
2462                         hash_offset = MDS_DIR_END_OFF;
2463                         GOTO(out, rc);
2464                 }
2465
2466                 ent_size = le16_to_cpu(min_ent->lde_reclen);
2467
2468                 /* the last entry lde_reclen is 0, but it might not
2469                  * the end of this entry of this temporay entry */
2470                 if (ent_size == 0)
2471                         ent_size = lu_dirent_calc_size(
2472                                         le16_to_cpu(min_ent->lde_namelen),
2473                                         le32_to_cpu(min_ent->lde_attrs));
2474                 if (ent_size > left_bytes) {
2475                         last_ent->lde_reclen = cpu_to_le16(0);
2476                         hash_offset = le64_to_cpu(min_ent->lde_hash);
2477                         GOTO(out, rc);
2478                 }
2479
2480                 memcpy(ent, min_ent, ent_size);
2481
2482                 /* Replace . with master FID and Replace .. with the parent FID
2483                  * of master object */
2484                 if (strncmp(ent->lde_name, ".",
2485                             le16_to_cpu(ent->lde_namelen)) == 0 &&
2486                     le16_to_cpu(ent->lde_namelen) == 1)
2487                         fid_cpu_to_le(&ent->lde_fid, &master_fid);
2488                 else if (strncmp(ent->lde_name, "..",
2489                                    le16_to_cpu(ent->lde_namelen)) == 0 &&
2490                            le16_to_cpu(ent->lde_namelen) == 2)
2491                         fid_cpu_to_le(&ent->lde_fid, &op_data->op_fid3);
2492
2493                 left_bytes -= ent_size;
2494                 ent->lde_reclen = cpu_to_le16(ent_size);
2495                 last_ent = ent;
2496                 ent = (void *)ent + ent_size;
2497                 hash_offset = le64_to_cpu(min_ent->lde_hash);
2498                 if (hash_offset == MDS_DIR_END_OFF) {
2499                         last_ent->lde_reclen = 0;
2500                         break;
2501                 }
2502         } while (1);
2503 out:
2504         if (min_ent_page != NULL) {
2505                 kunmap(min_ent_page);
2506                 page_cache_release(min_ent_page);
2507         }
2508
2509         if (unlikely(rc != 0)) {
2510                 __free_page(ent_page);
2511                 ent_page = NULL;
2512         } else {
2513                 if (ent == area)
2514                         dp->ldp_flags |= LDF_EMPTY;
2515                 dp->ldp_flags = cpu_to_le32(dp->ldp_flags);
2516                 dp->ldp_hash_end = cpu_to_le64(hash_offset);
2517         }
2518
2519         /* We do not want to allocate md_op_data during each
2520          * dir entry reading, so op_data will be shared by every stripe,
2521          * then we need to restore it back to original value before
2522          * return to the upper layer */
2523         op_data->op_fid1 = master_fid;
2524         op_data->op_fid2 = master_fid;
2525         op_data->op_data = master_inode;
2526
2527         *ppage = ent_page;
2528
2529         RETURN(rc);
2530 }
2531
2532 int lmv_read_page(struct obd_export *exp, struct md_op_data *op_data,
2533                   struct md_callback *cb_op, __u64 offset,
2534                   struct page **ppage)
2535 {
2536         struct obd_device       *obd = exp->exp_obd;
2537         struct lmv_obd          *lmv = &obd->u.lmv;
2538         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2539         struct lmv_tgt_desc     *tgt;
2540         int                     rc;
2541         ENTRY;
2542
2543         rc = lmv_check_connect(obd);
2544         if (rc != 0)
2545                 RETURN(rc);
2546
2547         if (unlikely(lsm != NULL)) {
2548                 rc = lmv_read_striped_page(exp, op_data, cb_op, offset, ppage);
2549                 RETURN(rc);
2550         }
2551
2552         tgt = lmv_find_target(lmv, &op_data->op_fid1);
2553         if (IS_ERR(tgt))
2554                 RETURN(PTR_ERR(tgt));
2555
2556         rc = md_read_page(tgt->ltd_exp, op_data, cb_op, offset, ppage);
2557
2558         RETURN(rc);
2559 }
2560
2561 /**
2562  * Unlink a file/directory
2563  *
2564  * Unlink a file or directory under the parent dir. The unlink request
2565  * usually will be sent to the MDT where the child is located, but if
2566  * the client does not have the child FID then request will be sent to the
2567  * MDT where the parent is located.
2568  *
2569  * If the parent is a striped directory then it also needs to locate which
2570  * stripe the name of the child is located, and replace the parent FID
2571  * (@op->op_fid1) with the stripe FID. Note: if the stripe is unknown,
2572  * it will walk through all of sub-stripes until the child is being
2573  * unlinked finally.
2574  *
2575  * \param[in] exp       export refer to LMV
2576  * \param[in] op_data   different parameters transferred beween client
2577  *                      MD stacks, name, namelen, FIDs etc.
2578  *                      op_fid1 is the parent FID, op_fid2 is the child
2579  *                      FID.
2580  * \param[out] request  point to the request of unlink.
2581  *
2582  * retval               0 if succeed
2583  *                      negative errno if failed.
2584  */
2585 static int lmv_unlink(struct obd_export *exp, struct md_op_data *op_data,
2586                       struct ptlrpc_request **request)
2587 {
2588         struct obd_device       *obd = exp->exp_obd;
2589         struct lmv_obd          *lmv = &obd->u.lmv;
2590         struct lmv_tgt_desc     *tgt = NULL;
2591         struct lmv_tgt_desc     *parent_tgt = NULL;
2592         struct mdt_body         *body;
2593         int                     rc;
2594         int                     stripe_index = 0;
2595         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2596         ENTRY;
2597
2598         rc = lmv_check_connect(obd);
2599         if (rc)
2600                 RETURN(rc);
2601 retry_unlink:
2602         /* For striped dir, we need to locate the parent as well */
2603         if (lsm != NULL) {
2604                 struct lmv_tgt_desc *tmp;
2605
2606                 LASSERT(op_data->op_name != NULL &&
2607                         op_data->op_namelen != 0);
2608
2609                 tmp = lmv_locate_target_for_name(lmv, lsm,
2610                                                  op_data->op_name,
2611                                                  op_data->op_namelen,
2612                                                  &op_data->op_fid1,
2613                                                  &op_data->op_mds);
2614
2615                 /* return -EBADFD means unknown hash type, might
2616                  * need try all sub-stripe here */
2617                 if (IS_ERR(tmp) && PTR_ERR(tmp) != -EBADFD)
2618                         RETURN(PTR_ERR(tmp));
2619
2620                 /* Note: both migrating dir and unknown hash dir need to
2621                  * try all of sub-stripes, so we need start search the
2622                  * name from stripe 0, but migrating dir is already handled
2623                  * inside lmv_locate_target_for_name(), so we only check
2624                  * unknown hash type directory here */
2625                 if (!lmv_is_known_hash_type(lsm->lsm_md_hash_type)) {
2626                         struct lmv_oinfo *oinfo;
2627
2628                         oinfo = &lsm->lsm_md_oinfo[stripe_index];
2629
2630                         op_data->op_fid1 = oinfo->lmo_fid;
2631                         op_data->op_mds = oinfo->lmo_mds;
2632                 }
2633         }
2634
2635 try_next_stripe:
2636         /* Send unlink requests to the MDT where the child is located */
2637         if (likely(!fid_is_zero(&op_data->op_fid2)))
2638                 tgt = lmv_find_target(lmv, &op_data->op_fid2);
2639         else if (lsm != NULL)
2640                 tgt = lmv_get_target(lmv, op_data->op_mds, NULL);
2641         else
2642                 tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
2643
2644         if (IS_ERR(tgt))
2645                 RETURN(PTR_ERR(tgt));
2646
2647         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2648         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2649         op_data->op_cap = cfs_curproc_cap_pack();
2650
2651         /*
2652          * If child's fid is given, cancel unused locks for it if it is from
2653          * another export than parent.
2654          *
2655          * LOOKUP lock for child (fid3) should also be cancelled on parent
2656          * tgt_tgt in mdc_unlink().
2657          */
2658         op_data->op_flags |= MF_MDC_CANCEL_FID1 | MF_MDC_CANCEL_FID3;
2659
2660         /*
2661          * Cancel FULL locks on child (fid3).
2662          */
2663         parent_tgt = lmv_find_target(lmv, &op_data->op_fid1);
2664         if (IS_ERR(parent_tgt))
2665                 RETURN(PTR_ERR(parent_tgt));
2666
2667         if (parent_tgt != tgt) {
2668                 rc = lmv_early_cancel(exp, parent_tgt, op_data, tgt->ltd_idx,
2669                                       LCK_EX, MDS_INODELOCK_LOOKUP,
2670                                       MF_MDC_CANCEL_FID3);
2671         }
2672
2673         rc = lmv_early_cancel(exp, NULL, op_data, tgt->ltd_idx, LCK_EX,
2674                               MDS_INODELOCK_FULL, MF_MDC_CANCEL_FID3);
2675         if (rc != 0)
2676                 RETURN(rc);
2677
2678         CDEBUG(D_INODE, "unlink with fid="DFID"/"DFID" -> mds #%u\n",
2679                PFID(&op_data->op_fid1), PFID(&op_data->op_fid2), tgt->ltd_idx);
2680
2681         rc = md_unlink(tgt->ltd_exp, op_data, request);
2682         if (rc != 0 && rc != -EREMOTE && rc != -ENOENT)
2683                 RETURN(rc);
2684
2685         /* Try next stripe if it is needed. */
2686         if (rc == -ENOENT && lsm != NULL && lmv_need_try_all_stripes(lsm)) {
2687                 struct lmv_oinfo *oinfo;
2688
2689                 stripe_index++;
2690                 if (stripe_index >= lsm->lsm_md_stripe_count)
2691                         RETURN(rc);
2692
2693                 oinfo = &lsm->lsm_md_oinfo[stripe_index];
2694
2695                 op_data->op_fid1 = oinfo->lmo_fid;
2696                 op_data->op_mds = oinfo->lmo_mds;
2697
2698                 ptlrpc_req_finished(*request);
2699                 *request = NULL;
2700
2701                 goto try_next_stripe;
2702         }
2703
2704         body = req_capsule_server_get(&(*request)->rq_pill, &RMF_MDT_BODY);
2705         if (body == NULL)
2706                 RETURN(-EPROTO);
2707
2708         /* Not cross-ref case, just get out of here. */
2709         if (likely(!(body->mbo_valid & OBD_MD_MDS)))
2710                 RETURN(rc);
2711
2712         CDEBUG(D_INODE, "%s: try unlink to another MDT for "DFID"\n",
2713                exp->exp_obd->obd_name, PFID(&body->mbo_fid1));
2714
2715         /* This is a remote object, try remote MDT, Note: it may
2716          * try more than 1 time here, Considering following case
2717          * /mnt/lustre is root on MDT0, remote1 is on MDT1
2718          * 1. Initially A does not know where remote1 is, it send
2719          *    unlink RPC to MDT0, MDT0 return -EREMOTE, it will
2720          *    resend unlink RPC to MDT1 (retry 1st time).
2721          *
2722          * 2. During the unlink RPC in flight,
2723          *    client B mv /mnt/lustre/remote1 /mnt/lustre/remote2
2724          *    and create new remote1, but on MDT0
2725          *
2726          * 3. MDT1 get unlink RPC(from A), then do remote lock on
2727          *    /mnt/lustre, then lookup get fid of remote1, and find
2728          *    it is remote dir again, and replay -EREMOTE again.
2729          *
2730          * 4. Then A will resend unlink RPC to MDT0. (retry 2nd times).
2731          *
2732          * In theory, it might try unlimited time here, but it should
2733          * be very rare case.  */
2734         op_data->op_fid2 = body->mbo_fid1;
2735         ptlrpc_req_finished(*request);
2736         *request = NULL;
2737
2738         goto retry_unlink;
2739 }
2740
2741 static int lmv_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
2742 {
2743         struct lmv_obd *lmv = &obd->u.lmv;
2744         int rc = 0;
2745
2746         switch (stage) {
2747         case OBD_CLEANUP_EARLY:
2748                 /* XXX: here should be calling obd_precleanup() down to
2749                  * stack. */
2750                 break;
2751         case OBD_CLEANUP_EXPORTS:
2752                 fld_client_proc_fini(&lmv->lmv_fld);
2753                 lprocfs_obd_cleanup(obd);
2754                 lprocfs_free_md_stats(obd);
2755                 break;
2756         default:
2757                 break;
2758         }
2759         RETURN(rc);
2760 }
2761
2762 /**
2763  * Get by key a value associated with a LMV device.
2764  *
2765  * Dispatch request to lower-layer devices as needed.
2766  *
2767  * \param[in] env               execution environment for this thread
2768  * \param[in] exp               export for the LMV device
2769  * \param[in] keylen            length of key identifier
2770  * \param[in] key               identifier of key to get value for
2771  * \param[in] vallen            size of \a val
2772  * \param[out] val              pointer to storage location for value
2773  * \param[in] lsm               optional striping metadata of object
2774  *
2775  * \retval 0            on success
2776  * \retval negative     negated errno on failure
2777  */
2778 static int lmv_get_info(const struct lu_env *env, struct obd_export *exp,
2779                         __u32 keylen, void *key, __u32 *vallen, void *val)
2780 {
2781         struct obd_device       *obd;
2782         struct lmv_obd          *lmv;
2783         int                      rc = 0;
2784         ENTRY;
2785
2786         obd = class_exp2obd(exp);
2787         if (obd == NULL) {
2788                 CDEBUG(D_IOCTL, "Invalid client cookie "LPX64"\n",
2789                        exp->exp_handle.h_cookie);
2790                 RETURN(-EINVAL);
2791         }
2792
2793         lmv = &obd->u.lmv;
2794         if (keylen >= strlen("remote_flag") && !strcmp(key, "remote_flag")) {
2795                 int i;
2796
2797                 rc = lmv_check_connect(obd);
2798                 if (rc)
2799                         RETURN(rc);
2800
2801                 LASSERT(*vallen == sizeof(__u32));
2802                 for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2803                         struct lmv_tgt_desc *tgt = lmv->tgts[i];
2804                         /*
2805                          * All tgts should be connected when this gets called.
2806                          */
2807                         if (tgt == NULL || tgt->ltd_exp == NULL)
2808                                 continue;
2809
2810                         if (!obd_get_info(env, tgt->ltd_exp, keylen, key,
2811                                           vallen, val))
2812                                 RETURN(0);
2813                 }
2814                 RETURN(-EINVAL);
2815         } else if (KEY_IS(KEY_MAX_EASIZE) ||
2816                    KEY_IS(KEY_DEFAULT_EASIZE) ||
2817                    KEY_IS(KEY_CONN_DATA)) {
2818                 rc = lmv_check_connect(obd);
2819                 if (rc)
2820                         RETURN(rc);
2821
2822                 /*
2823                  * Forwarding this request to first MDS, it should know LOV
2824                  * desc.
2825                  */
2826                 rc = obd_get_info(env, lmv->tgts[0]->ltd_exp, keylen, key,
2827                                   vallen, val);
2828                 if (!rc && KEY_IS(KEY_CONN_DATA))
2829                         exp->exp_connect_data = *(struct obd_connect_data *)val;
2830                 RETURN(rc);
2831         } else if (KEY_IS(KEY_TGT_COUNT)) {
2832                 *((int *)val) = lmv->desc.ld_tgt_count;
2833                 RETURN(0);
2834         }
2835
2836         CDEBUG(D_IOCTL, "Invalid key\n");
2837         RETURN(-EINVAL);
2838 }
2839
2840 /**
2841  * Asynchronously set by key a value associated with a LMV device.
2842  *
2843  * Dispatch request to lower-layer devices as needed.
2844  *
2845  * \param[in] env       execution environment for this thread
2846  * \param[in] exp       export for the LMV device
2847  * \param[in] keylen    length of key identifier
2848  * \param[in] key       identifier of key to store value for
2849  * \param[in] vallen    size of value to store
2850  * \param[in] val       pointer to data to be stored
2851  * \param[in] set       optional list of related ptlrpc requests
2852  *
2853  * \retval 0            on success
2854  * \retval negative     negated errno on failure
2855  */
2856 int lmv_set_info_async(const struct lu_env *env, struct obd_export *exp,
2857                         __u32 keylen, void *key, __u32 vallen, void *val,
2858                         struct ptlrpc_request_set *set)
2859 {
2860         struct lmv_tgt_desc     *tgt = NULL;
2861         struct obd_device       *obd;
2862         struct lmv_obd          *lmv;
2863         int rc = 0;
2864         ENTRY;
2865
2866         obd = class_exp2obd(exp);
2867         if (obd == NULL) {
2868                 CDEBUG(D_IOCTL, "Invalid client cookie "LPX64"\n",
2869                        exp->exp_handle.h_cookie);
2870                 RETURN(-EINVAL);
2871         }
2872         lmv = &obd->u.lmv;
2873
2874         if (KEY_IS(KEY_READ_ONLY) || KEY_IS(KEY_FLUSH_CTX) ||
2875             KEY_IS(KEY_DEFAULT_EASIZE)) {
2876                 int i, err = 0;
2877
2878                 for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2879                         tgt = lmv->tgts[i];
2880
2881                         if (tgt == NULL || tgt->ltd_exp == NULL)
2882                                 continue;
2883
2884                         err = obd_set_info_async(env, tgt->ltd_exp,
2885                                                  keylen, key, vallen, val, set);
2886                         if (err && rc == 0)
2887                                 rc = err;
2888                 }
2889
2890                 RETURN(rc);
2891         }
2892
2893         RETURN(-EINVAL);
2894 }
2895
2896 static int lmv_unpack_md_v1(struct obd_export *exp, struct lmv_stripe_md *lsm,
2897                             const struct lmv_mds_md_v1 *lmm1)
2898 {
2899         struct lmv_obd  *lmv = &exp->exp_obd->u.lmv;
2900         int             stripe_count;
2901         int             cplen;
2902         int             i;
2903         int             rc = 0;
2904         ENTRY;
2905
2906         lsm->lsm_md_magic = le32_to_cpu(lmm1->lmv_magic);
2907         lsm->lsm_md_stripe_count = le32_to_cpu(lmm1->lmv_stripe_count);
2908         lsm->lsm_md_master_mdt_index = le32_to_cpu(lmm1->lmv_master_mdt_index);
2909         if (OBD_FAIL_CHECK(OBD_FAIL_UNKNOWN_LMV_STRIPE))
2910                 lsm->lsm_md_hash_type = LMV_HASH_TYPE_UNKNOWN;
2911         else
2912                 lsm->lsm_md_hash_type = le32_to_cpu(lmm1->lmv_hash_type);
2913         lsm->lsm_md_layout_version = le32_to_cpu(lmm1->lmv_layout_version);
2914         cplen = strlcpy(lsm->lsm_md_pool_name, lmm1->lmv_pool_name,
2915                         sizeof(lsm->lsm_md_pool_name));
2916
2917         if (cplen >= sizeof(lsm->lsm_md_pool_name))
2918                 RETURN(-E2BIG);
2919
2920         CDEBUG(D_INFO, "unpack lsm count %d, master %d hash_type %d"
2921                "layout_version %d\n", lsm->lsm_md_stripe_count,
2922                lsm->lsm_md_master_mdt_index, lsm->lsm_md_hash_type,
2923                lsm->lsm_md_layout_version);
2924
2925         stripe_count = le32_to_cpu(lmm1->lmv_stripe_count);
2926         for (i = 0; i < stripe_count; i++) {
2927                 fid_le_to_cpu(&lsm->lsm_md_oinfo[i].lmo_fid,
2928                               &lmm1->lmv_stripe_fids[i]);
2929                 rc = lmv_fld_lookup(lmv, &lsm->lsm_md_oinfo[i].lmo_fid,
2930                                     &lsm->lsm_md_oinfo[i].lmo_mds);
2931                 if (rc != 0)
2932                         RETURN(rc);
2933                 CDEBUG(D_INFO, "unpack fid #%d "DFID"\n", i,
2934                        PFID(&lsm->lsm_md_oinfo[i].lmo_fid));
2935         }
2936
2937         RETURN(rc);
2938 }
2939
2940 static int lmv_unpackmd(struct obd_export *exp, struct lmv_stripe_md **lsmp,
2941                         const union lmv_mds_md *lmm, size_t lmm_size)
2942 {
2943         struct lmv_stripe_md     *lsm;
2944         int                      lsm_size;
2945         int                      rc;
2946         bool                     allocated = false;
2947         ENTRY;
2948
2949         LASSERT(lsmp != NULL);
2950
2951         lsm = *lsmp;
2952         /* Free memmd */
2953         if (lsm != NULL && lmm == NULL) {
2954                 int i;
2955                 for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
2956                         /* For migrating inode, the master stripe and master
2957                          * object will be the same, so do not need iput, see
2958                          * ll_update_lsm_md */
2959                         if (!(lsm->lsm_md_hash_type & LMV_HASH_FLAG_MIGRATION &&
2960                               i == 0) && lsm->lsm_md_oinfo[i].lmo_root != NULL)
2961                                 iput(lsm->lsm_md_oinfo[i].lmo_root);
2962                 }
2963                 lsm_size = lmv_stripe_md_size(lsm->lsm_md_stripe_count);
2964                 OBD_FREE(lsm, lsm_size);
2965                 *lsmp = NULL;
2966                 RETURN(0);
2967         }
2968
2969         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_STRIPE)
2970                 RETURN(-EPERM);
2971
2972         /* Unpack memmd */
2973         if (le32_to_cpu(lmm->lmv_magic) != LMV_MAGIC_V1 &&
2974             le32_to_cpu(lmm->lmv_magic) != LMV_USER_MAGIC) {
2975                 CERROR("%s: invalid lmv magic %x: rc = %d\n",
2976                        exp->exp_obd->obd_name, le32_to_cpu(lmm->lmv_magic),
2977                        -EIO);
2978                 RETURN(-EIO);
2979         }
2980
2981         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_V1)
2982                 lsm_size = lmv_stripe_md_size(lmv_mds_md_stripe_count_get(lmm));
2983         else
2984                 /**
2985                  * Unpack default dirstripe(lmv_user_md) to lmv_stripe_md,
2986                  * stripecount should be 0 then.
2987                  */
2988                 lsm_size = lmv_stripe_md_size(0);
2989
2990         lsm_size = lmv_stripe_md_size(lmv_mds_md_stripe_count_get(lmm));
2991         if (lsm == NULL) {
2992                 OBD_ALLOC(lsm, lsm_size);
2993                 if (lsm == NULL)
2994                         RETURN(-ENOMEM);
2995                 allocated = true;
2996                 *lsmp = lsm;
2997         }
2998
2999         switch (le32_to_cpu(lmm->lmv_magic)) {
3000         case LMV_MAGIC_V1:
3001                 rc = lmv_unpack_md_v1(exp, lsm, &lmm->lmv_md_v1);
3002                 break;
3003         default:
3004                 CERROR("%s: unrecognized magic %x\n", exp->exp_obd->obd_name,
3005                        le32_to_cpu(lmm->lmv_magic));
3006                 rc = -EINVAL;
3007                 break;
3008         }
3009
3010         if (rc != 0 && allocated) {
3011                 OBD_FREE(lsm, lsm_size);
3012                 *lsmp = NULL;
3013                 lsm_size = rc;
3014         }
3015         RETURN(lsm_size);
3016 }
3017
3018 void lmv_free_memmd(struct lmv_stripe_md *lsm)
3019 {
3020         lmv_unpackmd(NULL, &lsm, NULL, 0);
3021 }
3022 EXPORT_SYMBOL(lmv_free_memmd);
3023
3024 static int lmv_cancel_unused(struct obd_export *exp, const struct lu_fid *fid,
3025                              union ldlm_policy_data *policy,
3026                              enum ldlm_mode mode, enum ldlm_cancel_flags flags,
3027                              void *opaque)
3028 {
3029         struct lmv_obd *lmv = &exp->exp_obd->u.lmv;
3030         int rc = 0;
3031         __u32 i;
3032         ENTRY;
3033
3034         LASSERT(fid != NULL);
3035
3036         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
3037                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
3038                 int err;
3039
3040                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active)
3041                         continue;
3042
3043                 err = md_cancel_unused(tgt->ltd_exp, fid, policy, mode, flags,
3044                                        opaque);
3045                 if (!rc)
3046                         rc = err;
3047         }
3048         RETURN(rc);
3049 }
3050
3051 int lmv_set_lock_data(struct obd_export *exp, __u64 *lockh, void *data,
3052                       __u64 *bits)
3053 {
3054         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
3055         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
3056         int                      rc;
3057         ENTRY;
3058
3059         if (tgt == NULL || tgt->ltd_exp == NULL)
3060                 RETURN(-EINVAL);
3061         rc =  md_set_lock_data(tgt->ltd_exp, lockh, data, bits);
3062         RETURN(rc);
3063 }
3064
3065 enum ldlm_mode lmv_lock_match(struct obd_export *exp, __u64 flags,
3066                               const struct lu_fid *fid, enum ldlm_type type,
3067                               union ldlm_policy_data *policy,
3068                               enum ldlm_mode mode, struct lustre_handle *lockh)
3069 {
3070         struct obd_device       *obd = exp->exp_obd;
3071         struct lmv_obd          *lmv = &obd->u.lmv;
3072         enum ldlm_mode          rc;
3073         int                     tgt;
3074         int                     i;
3075         ENTRY;
3076
3077         CDEBUG(D_INODE, "Lock match for "DFID"\n", PFID(fid));
3078
3079         /*
3080          * With DNE every object can have two locks in different namespaces:
3081          * lookup lock in space of MDT storing direntry and update/open lock in
3082          * space of MDT storing inode.  Try the MDT that the FID maps to first,
3083          * since this can be easily found, and only try others if that fails.
3084          */
3085         for (i = 0, tgt = lmv_find_target_index(lmv, fid);
3086              i < lmv->desc.ld_tgt_count;
3087              i++, tgt = (tgt + 1) % lmv->desc.ld_tgt_count) {
3088                 if (tgt < 0) {
3089                         CDEBUG(D_HA, "%s: "DFID" is inaccessible: rc = %d\n",
3090                                obd->obd_name, PFID(fid), tgt);
3091                         tgt = 0;
3092                 }
3093
3094                 if (lmv->tgts[tgt] == NULL ||
3095                     lmv->tgts[tgt]->ltd_exp == NULL ||
3096                     lmv->tgts[tgt]->ltd_active == 0)
3097                         continue;
3098
3099                 rc = md_lock_match(lmv->tgts[tgt]->ltd_exp, flags, fid,
3100                                    type, policy, mode, lockh);
3101                 if (rc)
3102                         RETURN(rc);
3103         }
3104
3105         RETURN(0);
3106 }
3107
3108 int lmv_get_lustre_md(struct obd_export *exp, struct ptlrpc_request *req,
3109                       struct obd_export *dt_exp, struct obd_export *md_exp,
3110                       struct lustre_md *md)
3111 {
3112         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
3113         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
3114
3115         if (tgt == NULL || tgt->ltd_exp == NULL)
3116                 RETURN(-EINVAL);
3117
3118         return md_get_lustre_md(lmv->tgts[0]->ltd_exp, req, dt_exp, md_exp, md);
3119 }
3120
3121 int lmv_free_lustre_md(struct obd_export *exp, struct lustre_md *md)
3122 {
3123         struct obd_device       *obd = exp->exp_obd;
3124         struct lmv_obd          *lmv = &obd->u.lmv;
3125         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
3126         ENTRY;
3127
3128         if (md->lmv != NULL) {
3129                 lmv_free_memmd(md->lmv);
3130                 md->lmv = NULL;
3131         }
3132         if (tgt == NULL || tgt->ltd_exp == NULL)
3133                 RETURN(-EINVAL);
3134         RETURN(md_free_lustre_md(lmv->tgts[0]->ltd_exp, md));
3135 }
3136
3137 int lmv_set_open_replay_data(struct obd_export *exp,
3138                              struct obd_client_handle *och,
3139                              struct lookup_intent *it)
3140 {
3141         struct obd_device       *obd = exp->exp_obd;
3142         struct lmv_obd          *lmv = &obd->u.lmv;
3143         struct lmv_tgt_desc     *tgt;
3144         ENTRY;
3145
3146         tgt = lmv_find_target(lmv, &och->och_fid);
3147         if (IS_ERR(tgt))
3148                 RETURN(PTR_ERR(tgt));
3149
3150         RETURN(md_set_open_replay_data(tgt->ltd_exp, och, it));
3151 }
3152
3153 int lmv_clear_open_replay_data(struct obd_export *exp,
3154                                struct obd_client_handle *och)
3155 {
3156         struct obd_device       *obd = exp->exp_obd;
3157         struct lmv_obd          *lmv = &obd->u.lmv;
3158         struct lmv_tgt_desc     *tgt;
3159         ENTRY;
3160
3161         tgt = lmv_find_target(lmv, &och->och_fid);
3162         if (IS_ERR(tgt))
3163                 RETURN(PTR_ERR(tgt));
3164
3165         RETURN(md_clear_open_replay_data(tgt->ltd_exp, och));
3166 }
3167
3168 static int lmv_get_remote_perm(struct obd_export *exp, const struct lu_fid *fid,
3169                                u32 suppgid, struct ptlrpc_request **request)
3170 {
3171         struct obd_device       *obd = exp->exp_obd;
3172         struct lmv_obd          *lmv = &obd->u.lmv;
3173         struct lmv_tgt_desc     *tgt;
3174         int                      rc;
3175         ENTRY;
3176
3177         rc = lmv_check_connect(obd);
3178         if (rc)
3179                 RETURN(rc);
3180
3181         tgt = lmv_find_target(lmv, fid);
3182         if (IS_ERR(tgt))
3183                 RETURN(PTR_ERR(tgt));
3184
3185         rc = md_get_remote_perm(tgt->ltd_exp, fid, suppgid, request);
3186         RETURN(rc);
3187 }
3188
3189 int lmv_intent_getattr_async(struct obd_export *exp,
3190                              struct md_enqueue_info *minfo,
3191                              struct ldlm_enqueue_info *einfo)
3192 {
3193         struct md_op_data       *op_data = &minfo->mi_data;
3194         struct obd_device       *obd = exp->exp_obd;
3195         struct lmv_obd          *lmv = &obd->u.lmv;
3196         struct lmv_tgt_desc     *tgt = NULL;
3197         int                      rc;
3198         ENTRY;
3199
3200         rc = lmv_check_connect(obd);
3201         if (rc)
3202                 RETURN(rc);
3203
3204         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
3205         if (IS_ERR(tgt))
3206                 RETURN(PTR_ERR(tgt));
3207
3208         rc = md_intent_getattr_async(tgt->ltd_exp, minfo, einfo);
3209