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[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, 2013, 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 #ifdef __KERNEL__
39 #include <linux/slab.h>
40 #include <linux/module.h>
41 #include <linux/init.h>
42 #include <linux/slab.h>
43 #include <linux/pagemap.h>
44 #include <linux/mm.h>
45 #include <linux/math64.h>
46 #include <linux/seq_file.h>
47 #include <linux/namei.h>
48 #else
49 #include <liblustre.h>
50 #endif
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 <lclient.h>
61 #include <lustre_lite.h>
62 #include <lustre_fid.h>
63 #include <lustre_ioctl.h>
64 #include "lmv_internal.h"
65
66 /* This hash is only for testing purpose */
67 static inline unsigned int
68 lmv_hash_all_chars(unsigned int count, const char *name, int namelen)
69 {
70         unsigned int c = 0;
71         const unsigned char *p = (const unsigned char *)name;
72
73         while (--namelen >= 0)
74                 c += p[namelen];
75
76         c = c % count;
77
78         return c;
79 }
80
81 static inline unsigned int
82 lmv_hash_fnv1a(unsigned int count, const char *name, int namelen)
83 {
84         __u64   hash;
85
86         hash = lustre_hash_fnv_1a_64(name, namelen);
87
88         hash = hash % count;
89
90         return hash;
91 }
92
93 int lmv_name_to_stripe_index(__u32 lmv_hash_type, unsigned int stripe_count,
94                              const char *name, int namelen)
95 {
96         int     idx;
97         __u32   hash_type = lmv_hash_type & LMV_HASH_TYPE_MASK;
98
99         LASSERT(namelen > 0);
100         if (stripe_count <= 1)
101                 return 0;
102
103         /* for migrating object, always start from 0 stripe */
104         if (lmv_hash_type & LMV_HASH_FLAG_MIGRATION)
105                 return 0;
106
107         switch (hash_type) {
108         case LMV_HASH_TYPE_ALL_CHARS:
109                 idx = lmv_hash_all_chars(stripe_count, name, namelen);
110                 break;
111         case LMV_HASH_TYPE_FNV_1A_64:
112                 idx = lmv_hash_fnv1a(stripe_count, name, namelen);
113                 break;
114         default:
115                 CERROR("Unknown hash type 0x%x\n", hash_type);
116                 return -EINVAL;
117         }
118
119         CDEBUG(D_INFO, "name %.*s hash_type %d idx %d\n", namelen, name,
120                hash_type, idx);
121
122         return idx;
123 }
124
125 static void lmv_activate_target(struct lmv_obd *lmv,
126                                 struct lmv_tgt_desc *tgt,
127                                 int activate)
128 {
129         if (tgt->ltd_active == activate)
130                 return;
131
132         tgt->ltd_active = activate;
133         lmv->desc.ld_active_tgt_count += (activate ? 1 : -1);
134 }
135
136 /**
137  * Error codes:
138  *
139  *  -EINVAL  : UUID can't be found in the LMV's target list
140  *  -ENOTCONN: The UUID is found, but the target connection is bad (!)
141  *  -EBADF   : The UUID is found, but the OBD of the wrong type (!)
142  */
143 static int lmv_set_mdc_active(struct lmv_obd *lmv,
144                               const struct obd_uuid *uuid,
145                               int activate)
146 {
147         struct lmv_tgt_desc     *tgt = NULL;
148         struct obd_device       *obd;
149         __u32                    i;
150         int                      rc = 0;
151         ENTRY;
152
153         CDEBUG(D_INFO, "Searching in lmv %p for uuid %s (activate=%d)\n",
154                         lmv, uuid->uuid, activate);
155
156         spin_lock(&lmv->lmv_lock);
157         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
158                 tgt = lmv->tgts[i];
159                 if (tgt == NULL || tgt->ltd_exp == NULL)
160                         continue;
161
162                 CDEBUG(D_INFO, "Target idx %d is %s conn "LPX64"\n", i,
163                        tgt->ltd_uuid.uuid, tgt->ltd_exp->exp_handle.h_cookie);
164
165                 if (obd_uuid_equals(uuid, &tgt->ltd_uuid))
166                         break;
167         }
168
169         if (i == lmv->desc.ld_tgt_count)
170                 GOTO(out_lmv_lock, rc = -EINVAL);
171
172         obd = class_exp2obd(tgt->ltd_exp);
173         if (obd == NULL)
174                 GOTO(out_lmv_lock, rc = -ENOTCONN);
175
176         CDEBUG(D_INFO, "Found OBD %s=%s device %d (%p) type %s at LMV idx %d\n",
177                obd->obd_name, obd->obd_uuid.uuid, obd->obd_minor, obd,
178                obd->obd_type->typ_name, i);
179         LASSERT(strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) == 0);
180
181         if (tgt->ltd_active == activate) {
182                 CDEBUG(D_INFO, "OBD %p already %sactive!\n", obd,
183                        activate ? "" : "in");
184                 GOTO(out_lmv_lock, rc);
185         }
186
187         CDEBUG(D_INFO, "Marking OBD %p %sactive\n", obd,
188                activate ? "" : "in");
189         lmv_activate_target(lmv, tgt, activate);
190         EXIT;
191
192  out_lmv_lock:
193         spin_unlock(&lmv->lmv_lock);
194         return rc;
195 }
196
197 struct obd_uuid *lmv_get_uuid(struct obd_export *exp)
198 {
199         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
200         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
201
202         return (tgt == NULL) ? NULL : obd_get_uuid(tgt->ltd_exp);
203 }
204
205 static int lmv_notify(struct obd_device *obd, struct obd_device *watched,
206                       enum obd_notify_event ev, void *data)
207 {
208         struct obd_connect_data *conn_data;
209         struct lmv_obd          *lmv = &obd->u.lmv;
210         struct obd_uuid         *uuid;
211         int                      rc = 0;
212         ENTRY;
213
214         if (strcmp(watched->obd_type->typ_name, LUSTRE_MDC_NAME)) {
215                 CERROR("unexpected notification of %s %s!\n",
216                        watched->obd_type->typ_name,
217                        watched->obd_name);
218                 RETURN(-EINVAL);
219         }
220
221         uuid = &watched->u.cli.cl_target_uuid;
222         if (ev == OBD_NOTIFY_ACTIVE || ev == OBD_NOTIFY_INACTIVE) {
223                 /*
224                  * Set MDC as active before notifying the observer, so the
225                  * observer can use the MDC normally.
226                  */
227                 rc = lmv_set_mdc_active(lmv, uuid,
228                                         ev == OBD_NOTIFY_ACTIVE);
229                 if (rc) {
230                         CERROR("%sactivation of %s failed: %d\n",
231                                ev == OBD_NOTIFY_ACTIVE ? "" : "de",
232                                uuid->uuid, rc);
233                         RETURN(rc);
234                 }
235         } else if (ev == OBD_NOTIFY_OCD) {
236                 conn_data = &watched->u.cli.cl_import->imp_connect_data;
237                 /*
238                  * XXX: Make sure that ocd_connect_flags from all targets are
239                  * the same. Otherwise one of MDTs runs wrong version or
240                  * something like this.  --umka
241                  */
242                 obd->obd_self_export->exp_connect_data = *conn_data;
243         }
244 #if 0
245         else if (ev == OBD_NOTIFY_DISCON) {
246                 /*
247                  * For disconnect event, flush fld cache for failout MDS case.
248                  */
249                 fld_client_flush(&lmv->lmv_fld);
250         }
251 #endif
252         /*
253          * Pass the notification up the chain.
254          */
255         if (obd->obd_observer)
256                 rc = obd_notify(obd->obd_observer, watched, ev, data);
257
258         RETURN(rc);
259 }
260
261 /**
262  * This is fake connect function. Its purpose is to initialize lmv and say
263  * caller that everything is okay. Real connection will be performed later.
264  */
265 static int lmv_connect(const struct lu_env *env,
266                        struct obd_export **exp, struct obd_device *obd,
267                        struct obd_uuid *cluuid, struct obd_connect_data *data,
268                        void *localdata)
269 {
270         struct lmv_obd        *lmv = &obd->u.lmv;
271         struct lustre_handle  conn = { 0 };
272         int                    rc = 0;
273         ENTRY;
274
275         /*
276          * We don't want to actually do the underlying connections more than
277          * once, so keep track.
278          */
279         lmv->refcount++;
280         if (lmv->refcount > 1) {
281                 *exp = NULL;
282                 RETURN(0);
283         }
284
285         rc = class_connect(&conn, obd, cluuid);
286         if (rc) {
287                 CERROR("class_connection() returned %d\n", rc);
288                 RETURN(rc);
289         }
290
291         *exp = class_conn2export(&conn);
292         class_export_get(*exp);
293
294         lmv->exp = *exp;
295         lmv->connected = 0;
296         lmv->cluuid = *cluuid;
297
298         if (data)
299                 lmv->conn_data = *data;
300
301         if (lmv->targets_proc_entry == NULL) {
302                 lmv->targets_proc_entry = lprocfs_seq_register("target_obds",
303                                                         obd->obd_proc_entry,
304                                                         NULL, NULL);
305                 if (IS_ERR(lmv->targets_proc_entry)) {
306                         CERROR("could not register /proc/fs/lustre/%s/%s/target_obds.",
307                                obd->obd_type->typ_name, obd->obd_name);
308                         lmv->targets_proc_entry = NULL;
309                 }
310         }
311
312         /*
313          * All real clients should perform actual connection right away, because
314          * it is possible, that LMV will not have opportunity to connect targets
315          * and MDC stuff will be called directly, for instance while reading
316          * ../mdc/../kbytesfree procfs file, etc.
317          */
318         if (data != NULL && (data->ocd_connect_flags & OBD_CONNECT_REAL))
319                 rc = lmv_check_connect(obd);
320
321         if (rc && lmv->targets_proc_entry != NULL)
322                 lprocfs_remove(&lmv->targets_proc_entry);
323         RETURN(rc);
324 }
325
326 static void lmv_set_timeouts(struct obd_device *obd)
327 {
328         struct lmv_obd          *lmv;
329         __u32                    i;
330
331         lmv = &obd->u.lmv;
332         if (lmv->server_timeout == 0)
333                 return;
334
335         if (lmv->connected == 0)
336                 return;
337
338         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
339                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
340
341                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active)
342                         continue;
343
344                 obd_set_info_async(NULL, tgt->ltd_exp, sizeof(KEY_INTERMDS),
345                                    KEY_INTERMDS, 0, NULL, NULL);
346         }
347 }
348
349 static int lmv_init_ea_size(struct obd_export *exp, int easize,
350                             int def_easize, int cookiesize, int def_cookiesize)
351 {
352         struct obd_device       *obd = exp->exp_obd;
353         struct lmv_obd          *lmv = &obd->u.lmv;
354         __u32                    i;
355         int                      rc = 0;
356         int                      change = 0;
357         ENTRY;
358
359         if (lmv->max_easize < easize) {
360                 lmv->max_easize = easize;
361                 change = 1;
362         }
363         if (lmv->max_def_easize < def_easize) {
364                 lmv->max_def_easize = def_easize;
365                 change = 1;
366         }
367         if (lmv->max_cookiesize < cookiesize) {
368                 lmv->max_cookiesize = cookiesize;
369                 change = 1;
370         }
371         if (lmv->max_def_cookiesize < def_cookiesize) {
372                 lmv->max_def_cookiesize = def_cookiesize;
373                 change = 1;
374         }
375         if (change == 0)
376                 RETURN(0);
377
378         if (lmv->connected == 0)
379                 RETURN(0);
380
381         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
382                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
383
384                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active) {
385                         CWARN("%s: NULL export for %d\n", obd->obd_name, i);
386                         continue;
387                 }
388
389                 rc = md_init_ea_size(tgt->ltd_exp, easize, def_easize,
390                                      cookiesize, def_cookiesize);
391                 if (rc) {
392                         CERROR("%s: obd_init_ea_size() failed on MDT target %d:"
393                                " rc = %d.\n", obd->obd_name, i, rc);
394                         break;
395                 }
396         }
397         RETURN(rc);
398 }
399
400 #define MAX_STRING_SIZE 128
401
402 int lmv_connect_mdc(struct obd_device *obd, struct lmv_tgt_desc *tgt)
403 {
404         struct lmv_obd          *lmv = &obd->u.lmv;
405         struct obd_uuid         *cluuid = &lmv->cluuid;
406         struct obd_uuid          lmv_mdc_uuid = { "LMV_MDC_UUID" };
407         struct obd_device       *mdc_obd;
408         struct obd_export       *mdc_exp;
409         struct lu_fld_target     target;
410         int                      rc;
411         ENTRY;
412
413         mdc_obd = class_find_client_obd(&tgt->ltd_uuid, LUSTRE_MDC_NAME,
414                                         &obd->obd_uuid);
415         if (!mdc_obd) {
416                 CERROR("target %s not attached\n", tgt->ltd_uuid.uuid);
417                 RETURN(-EINVAL);
418         }
419
420         CDEBUG(D_CONFIG, "connect to %s(%s) - %s, %s FOR %s\n",
421                 mdc_obd->obd_name, mdc_obd->obd_uuid.uuid,
422                 tgt->ltd_uuid.uuid, obd->obd_uuid.uuid,
423                 cluuid->uuid);
424
425         if (!mdc_obd->obd_set_up) {
426                 CERROR("target %s is not set up\n", tgt->ltd_uuid.uuid);
427                 RETURN(-EINVAL);
428         }
429
430         rc = obd_connect(NULL, &mdc_exp, mdc_obd, &lmv_mdc_uuid,
431                          &lmv->conn_data, NULL);
432         if (rc) {
433                 CERROR("target %s connect error %d\n", tgt->ltd_uuid.uuid, rc);
434                 RETURN(rc);
435         }
436
437         /*
438          * Init fid sequence client for this mdc and add new fld target.
439          */
440         rc = obd_fid_init(mdc_obd, mdc_exp, LUSTRE_SEQ_METADATA);
441         if (rc)
442                 RETURN(rc);
443
444         target.ft_srv = NULL;
445         target.ft_exp = mdc_exp;
446         target.ft_idx = tgt->ltd_idx;
447
448         fld_client_add_target(&lmv->lmv_fld, &target);
449
450         rc = obd_register_observer(mdc_obd, obd);
451         if (rc) {
452                 obd_disconnect(mdc_exp);
453                 CERROR("target %s register_observer error %d\n",
454                        tgt->ltd_uuid.uuid, rc);
455                 RETURN(rc);
456         }
457
458         if (obd->obd_observer) {
459                 /*
460                  * Tell the observer about the new target.
461                  */
462                 rc = obd_notify(obd->obd_observer, mdc_exp->exp_obd,
463                                 OBD_NOTIFY_ACTIVE,
464                                 (void *)(tgt - lmv->tgts[0]));
465                 if (rc) {
466                         obd_disconnect(mdc_exp);
467                         RETURN(rc);
468                 }
469         }
470
471         tgt->ltd_active = 1;
472         tgt->ltd_exp = mdc_exp;
473         lmv->desc.ld_active_tgt_count++;
474
475         md_init_ea_size(tgt->ltd_exp, lmv->max_easize, lmv->max_def_easize,
476                         lmv->max_cookiesize, lmv->max_def_cookiesize);
477
478         CDEBUG(D_CONFIG, "Connected to %s(%s) successfully (%d)\n",
479                 mdc_obd->obd_name, mdc_obd->obd_uuid.uuid,
480                 atomic_read(&obd->obd_refcount));
481
482         if (lmv->targets_proc_entry != NULL) {
483                 struct proc_dir_entry *mdc_symlink;
484
485                 LASSERT(mdc_obd->obd_type != NULL);
486                 LASSERT(mdc_obd->obd_type->typ_name != NULL);
487                 mdc_symlink = lprocfs_add_symlink(mdc_obd->obd_name,
488                                                   lmv->targets_proc_entry,
489                                                   "../../../%s/%s",
490                                                   mdc_obd->obd_type->typ_name,
491                                                   mdc_obd->obd_name);
492                 if (mdc_symlink == NULL) {
493                         CERROR("Could not register LMV target "
494                                "/proc/fs/lustre/%s/%s/target_obds/%s.",
495                                obd->obd_type->typ_name, obd->obd_name,
496                                mdc_obd->obd_name);
497                 }
498         }
499         RETURN(0);
500 }
501
502 static void lmv_del_target(struct lmv_obd *lmv, int index)
503 {
504         if (lmv->tgts[index] == NULL)
505                 return;
506
507         OBD_FREE_PTR(lmv->tgts[index]);
508         lmv->tgts[index] = NULL;
509         return;
510 }
511
512 static int lmv_add_target(struct obd_device *obd, struct obd_uuid *uuidp,
513                            __u32 index, int gen)
514 {
515         struct lmv_obd      *lmv = &obd->u.lmv;
516         struct lmv_tgt_desc *tgt;
517         int                  orig_tgt_count = 0;
518         int                  rc = 0;
519         ENTRY;
520
521         CDEBUG(D_CONFIG, "Target uuid: %s. index %d\n", uuidp->uuid, index);
522
523         lmv_init_lock(lmv);
524
525         if (lmv->desc.ld_tgt_count == 0) {
526                 struct obd_device *mdc_obd;
527
528                 mdc_obd = class_find_client_obd(uuidp, LUSTRE_MDC_NAME,
529                                                 &obd->obd_uuid);
530                 if (!mdc_obd) {
531                         lmv_init_unlock(lmv);
532                         CERROR("%s: Target %s not attached: rc = %d\n",
533                                obd->obd_name, uuidp->uuid, -EINVAL);
534                         RETURN(-EINVAL);
535                 }
536         }
537
538         if ((index < lmv->tgts_size) && (lmv->tgts[index] != NULL)) {
539                 tgt = lmv->tgts[index];
540                 CERROR("%s: UUID %s already assigned at LOV target index %d:"
541                        " rc = %d\n", obd->obd_name,
542                        obd_uuid2str(&tgt->ltd_uuid), index, -EEXIST);
543                 lmv_init_unlock(lmv);
544                 RETURN(-EEXIST);
545         }
546
547         if (index >= lmv->tgts_size) {
548                 /* We need to reallocate the lmv target array. */
549                 struct lmv_tgt_desc **newtgts, **old = NULL;
550                 __u32 newsize = 1;
551                 __u32 oldsize = 0;
552
553                 while (newsize < index + 1)
554                         newsize = newsize << 1;
555                 OBD_ALLOC(newtgts, sizeof(*newtgts) * newsize);
556                 if (newtgts == NULL) {
557                         lmv_init_unlock(lmv);
558                         RETURN(-ENOMEM);
559                 }
560
561                 if (lmv->tgts_size) {
562                         memcpy(newtgts, lmv->tgts,
563                                sizeof(*newtgts) * lmv->tgts_size);
564                         old = lmv->tgts;
565                         oldsize = lmv->tgts_size;
566                 }
567
568                 lmv->tgts = newtgts;
569                 lmv->tgts_size = newsize;
570                 smp_rmb();
571                 if (old)
572                         OBD_FREE(old, sizeof(*old) * oldsize);
573
574                 CDEBUG(D_CONFIG, "tgts: %p size: %d\n", lmv->tgts,
575                        lmv->tgts_size);
576         }
577
578         OBD_ALLOC_PTR(tgt);
579         if (!tgt) {
580                 lmv_init_unlock(lmv);
581                 RETURN(-ENOMEM);
582         }
583
584         mutex_init(&tgt->ltd_fid_mutex);
585         tgt->ltd_idx = index;
586         tgt->ltd_uuid = *uuidp;
587         tgt->ltd_active = 0;
588         lmv->tgts[index] = tgt;
589         if (index >= lmv->desc.ld_tgt_count) {
590                 orig_tgt_count = lmv->desc.ld_tgt_count;
591                 lmv->desc.ld_tgt_count = index + 1;
592         }
593
594         if (lmv->connected) {
595                 rc = lmv_connect_mdc(obd, tgt);
596                 if (rc != 0) {
597                         spin_lock(&lmv->lmv_lock);
598                         if (lmv->desc.ld_tgt_count == index + 1)
599                                 lmv->desc.ld_tgt_count = orig_tgt_count;
600                         memset(tgt, 0, sizeof(*tgt));
601                         spin_unlock(&lmv->lmv_lock);
602                 } else {
603                         int easize = sizeof(struct lmv_stripe_md) +
604                                 lmv->desc.ld_tgt_count * sizeof(struct lu_fid);
605                         lmv_init_ea_size(obd->obd_self_export, easize, 0, 0, 0);
606                 }
607         }
608
609         lmv_init_unlock(lmv);
610         RETURN(rc);
611 }
612
613 int lmv_check_connect(struct obd_device *obd)
614 {
615         struct lmv_obd          *lmv = &obd->u.lmv;
616         struct lmv_tgt_desc     *tgt;
617         __u32                    i;
618         int                      rc;
619         int                      easize;
620         ENTRY;
621
622         if (lmv->connected)
623                 RETURN(0);
624
625         lmv_init_lock(lmv);
626         if (lmv->connected) {
627                 lmv_init_unlock(lmv);
628                 RETURN(0);
629         }
630
631         if (lmv->desc.ld_tgt_count == 0) {
632                 lmv_init_unlock(lmv);
633                 CERROR("%s: no targets configured.\n", obd->obd_name);
634                 RETURN(-EINVAL);
635         }
636
637         LASSERT(lmv->tgts != NULL);
638
639         if (lmv->tgts[0] == NULL) {
640                 lmv_init_unlock(lmv);
641                 CERROR("%s: no target configured for index 0.\n",
642                        obd->obd_name);
643                 RETURN(-EINVAL);
644         }
645
646         CDEBUG(D_CONFIG, "Time to connect %s to %s\n",
647                lmv->cluuid.uuid, obd->obd_name);
648
649         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
650                 tgt = lmv->tgts[i];
651                 if (tgt == NULL)
652                         continue;
653                 rc = lmv_connect_mdc(obd, tgt);
654                 if (rc)
655                         GOTO(out_disc, rc);
656         }
657
658         lmv_set_timeouts(obd);
659         class_export_put(lmv->exp);
660         lmv->connected = 1;
661         easize = lmv_mds_md_size(lmv->desc.ld_tgt_count, LMV_MAGIC);
662         lmv_init_ea_size(obd->obd_self_export, easize, 0, 0, 0);
663         lmv_init_unlock(lmv);
664         RETURN(0);
665
666  out_disc:
667         while (i-- > 0) {
668                 int rc2;
669                 tgt = lmv->tgts[i];
670                 if (tgt == NULL)
671                         continue;
672                 tgt->ltd_active = 0;
673                 if (tgt->ltd_exp) {
674                         --lmv->desc.ld_active_tgt_count;
675                         rc2 = obd_disconnect(tgt->ltd_exp);
676                         if (rc2) {
677                                 CERROR("LMV target %s disconnect on "
678                                        "MDC idx %d: error %d\n",
679                                        tgt->ltd_uuid.uuid, i, rc2);
680                         }
681                 }
682         }
683         class_disconnect(lmv->exp);
684         lmv_init_unlock(lmv);
685         RETURN(rc);
686 }
687
688 static int lmv_disconnect_mdc(struct obd_device *obd, struct lmv_tgt_desc *tgt)
689 {
690         struct lmv_obd         *lmv = &obd->u.lmv;
691         struct obd_device      *mdc_obd;
692         int                     rc;
693         ENTRY;
694
695         LASSERT(tgt != NULL);
696         LASSERT(obd != NULL);
697
698         mdc_obd = class_exp2obd(tgt->ltd_exp);
699
700         if (mdc_obd) {
701                 mdc_obd->obd_force = obd->obd_force;
702                 mdc_obd->obd_fail = obd->obd_fail;
703                 mdc_obd->obd_no_recov = obd->obd_no_recov;
704         }
705
706         if (lmv->targets_proc_entry != NULL)
707                 lprocfs_remove_proc_entry(mdc_obd->obd_name,
708                                           lmv->targets_proc_entry);
709
710         rc = obd_fid_fini(tgt->ltd_exp->exp_obd);
711         if (rc)
712                 CERROR("Can't finanize fids factory\n");
713
714         CDEBUG(D_INFO, "Disconnected from %s(%s) successfully\n",
715                tgt->ltd_exp->exp_obd->obd_name,
716                tgt->ltd_exp->exp_obd->obd_uuid.uuid);
717
718         obd_register_observer(tgt->ltd_exp->exp_obd, NULL);
719         rc = obd_disconnect(tgt->ltd_exp);
720         if (rc) {
721                 if (tgt->ltd_active) {
722                         CERROR("Target %s disconnect error %d\n",
723                                tgt->ltd_uuid.uuid, rc);
724                 }
725         }
726
727         lmv_activate_target(lmv, tgt, 0);
728         tgt->ltd_exp = NULL;
729         RETURN(0);
730 }
731
732 static int lmv_disconnect(struct obd_export *exp)
733 {
734         struct obd_device       *obd = class_exp2obd(exp);
735         struct lmv_obd          *lmv = &obd->u.lmv;
736         int                      rc;
737         __u32                    i;
738         ENTRY;
739
740         if (!lmv->tgts)
741                 goto out_local;
742
743         /*
744          * Only disconnect the underlying layers on the final disconnect.
745          */
746         lmv->refcount--;
747         if (lmv->refcount != 0)
748                 goto out_local;
749
750         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
751                 if (lmv->tgts[i] == NULL || lmv->tgts[i]->ltd_exp == NULL)
752                         continue;
753
754                 lmv_disconnect_mdc(obd, lmv->tgts[i]);
755         }
756
757         if (lmv->targets_proc_entry != NULL)
758                 lprocfs_remove(&lmv->targets_proc_entry);
759         else
760                 CERROR("/proc/fs/lustre/%s/%s/target_obds missing\n",
761                        obd->obd_type->typ_name, obd->obd_name);
762
763 out_local:
764         /*
765          * This is the case when no real connection is established by
766          * lmv_check_connect().
767          */
768         if (!lmv->connected)
769                 class_export_put(exp);
770         rc = class_disconnect(exp);
771         if (lmv->refcount == 0)
772                 lmv->connected = 0;
773         RETURN(rc);
774 }
775
776 static int lmv_fid2path(struct obd_export *exp, int len, void *karg, void *uarg)
777 {
778         struct obd_device       *obddev = class_exp2obd(exp);
779         struct lmv_obd          *lmv = &obddev->u.lmv;
780         struct getinfo_fid2path *gf;
781         struct lmv_tgt_desc     *tgt;
782         struct getinfo_fid2path *remote_gf = NULL;
783         int                     remote_gf_size = 0;
784         int                     rc;
785
786         gf = (struct getinfo_fid2path *)karg;
787         tgt = lmv_find_target(lmv, &gf->gf_fid);
788         if (IS_ERR(tgt))
789                 RETURN(PTR_ERR(tgt));
790
791 repeat_fid2path:
792         rc = obd_iocontrol(OBD_IOC_FID2PATH, tgt->ltd_exp, len, gf, uarg);
793         if (rc != 0 && rc != -EREMOTE)
794                 GOTO(out_fid2path, rc);
795
796         /* If remote_gf != NULL, it means just building the
797          * path on the remote MDT, copy this path segement to gf */
798         if (remote_gf != NULL) {
799                 struct getinfo_fid2path *ori_gf;
800                 char *ptr;
801
802                 ori_gf = (struct getinfo_fid2path *)karg;
803                 if (strlen(ori_gf->gf_path) +
804                     strlen(gf->gf_path) > ori_gf->gf_pathlen)
805                         GOTO(out_fid2path, rc = -EOVERFLOW);
806
807                 ptr = ori_gf->gf_path;
808
809                 memmove(ptr + strlen(gf->gf_path) + 1, ptr,
810                         strlen(ori_gf->gf_path));
811
812                 strncpy(ptr, gf->gf_path, strlen(gf->gf_path));
813                 ptr += strlen(gf->gf_path);
814                 *ptr = '/';
815         }
816
817         CDEBUG(D_INFO, "%s: get path %s "DFID" rec: "LPU64" ln: %u\n",
818                tgt->ltd_exp->exp_obd->obd_name,
819                gf->gf_path, PFID(&gf->gf_fid), gf->gf_recno,
820                gf->gf_linkno);
821
822         if (rc == 0)
823                 GOTO(out_fid2path, rc);
824
825         /* sigh, has to go to another MDT to do path building further */
826         if (remote_gf == NULL) {
827                 remote_gf_size = sizeof(*remote_gf) + PATH_MAX;
828                 OBD_ALLOC(remote_gf, remote_gf_size);
829                 if (remote_gf == NULL)
830                         GOTO(out_fid2path, rc = -ENOMEM);
831                 remote_gf->gf_pathlen = PATH_MAX;
832         }
833
834         if (!fid_is_sane(&gf->gf_fid)) {
835                 CERROR("%s: invalid FID "DFID": rc = %d\n",
836                        tgt->ltd_exp->exp_obd->obd_name,
837                        PFID(&gf->gf_fid), -EINVAL);
838                 GOTO(out_fid2path, rc = -EINVAL);
839         }
840
841         tgt = lmv_find_target(lmv, &gf->gf_fid);
842         if (IS_ERR(tgt))
843                 GOTO(out_fid2path, rc = -EINVAL);
844
845         remote_gf->gf_fid = gf->gf_fid;
846         remote_gf->gf_recno = -1;
847         remote_gf->gf_linkno = -1;
848         memset(remote_gf->gf_path, 0, remote_gf->gf_pathlen);
849         gf = remote_gf;
850         goto repeat_fid2path;
851
852 out_fid2path:
853         if (remote_gf != NULL)
854                 OBD_FREE(remote_gf, remote_gf_size);
855         RETURN(rc);
856 }
857
858 static int lmv_hsm_req_count(struct lmv_obd *lmv,
859                              const struct hsm_user_request *hur,
860                              const struct lmv_tgt_desc *tgt_mds)
861 {
862         __u32                    i;
863         int                      nr = 0;
864         struct lmv_tgt_desc     *curr_tgt;
865
866         /* count how many requests must be sent to the given target */
867         for (i = 0; i < hur->hur_request.hr_itemcount; i++) {
868                 curr_tgt = lmv_find_target(lmv, &hur->hur_user_item[i].hui_fid);
869                 if (obd_uuid_equals(&curr_tgt->ltd_uuid, &tgt_mds->ltd_uuid))
870                         nr++;
871         }
872         return nr;
873 }
874
875 static void lmv_hsm_req_build(struct lmv_obd *lmv,
876                               struct hsm_user_request *hur_in,
877                               const struct lmv_tgt_desc *tgt_mds,
878                               struct hsm_user_request *hur_out)
879 {
880         __u32                    i, nr_out;
881         struct lmv_tgt_desc     *curr_tgt;
882
883         /* build the hsm_user_request for the given target */
884         hur_out->hur_request = hur_in->hur_request;
885         nr_out = 0;
886         for (i = 0; i < hur_in->hur_request.hr_itemcount; i++) {
887                 curr_tgt = lmv_find_target(lmv,
888                                            &hur_in->hur_user_item[i].hui_fid);
889                 if (obd_uuid_equals(&curr_tgt->ltd_uuid, &tgt_mds->ltd_uuid)) {
890                         hur_out->hur_user_item[nr_out] =
891                                                 hur_in->hur_user_item[i];
892                         nr_out++;
893                 }
894         }
895         hur_out->hur_request.hr_itemcount = nr_out;
896         memcpy(hur_data(hur_out), hur_data(hur_in),
897                hur_in->hur_request.hr_data_len);
898 }
899
900 static int lmv_hsm_ct_unregister(struct lmv_obd *lmv, unsigned int cmd, int len,
901                                  struct lustre_kernelcomm *lk, void *uarg)
902 {
903         __u32                    i;
904         int                      rc;
905         struct kkuc_ct_data     *kcd = NULL;
906         ENTRY;
907
908         /* unregister request (call from llapi_hsm_copytool_fini) */
909         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
910                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
911
912                 if (tgt == NULL || tgt->ltd_exp == NULL)
913                         continue;
914                 /* best effort: try to clean as much as possible
915                  * (continue on error) */
916                 obd_iocontrol(cmd, tgt->ltd_exp, len, lk, uarg);
917         }
918
919         /* Whatever the result, remove copytool from kuc groups.
920          * Unreached coordinators will get EPIPE on next requests
921          * and will unregister automatically.
922          */
923         rc = libcfs_kkuc_group_rem(lk->lk_uid, lk->lk_group, (void **)&kcd);
924         if (kcd != NULL)
925                 OBD_FREE_PTR(kcd);
926
927         RETURN(rc);
928 }
929
930 static int lmv_hsm_ct_register(struct lmv_obd *lmv, unsigned int cmd, int len,
931                                struct lustre_kernelcomm *lk, void *uarg)
932 {
933         struct file             *filp;
934         __u32                    i, j;
935         int                      err, rc;
936         bool                     any_set = false;
937         struct kkuc_ct_data     *kcd;
938         ENTRY;
939
940         /* All or nothing: try to register to all MDS.
941          * In case of failure, unregister from previous MDS,
942          * except if it because of inactive target. */
943         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
944                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
945
946                 if (tgt == NULL || tgt->ltd_exp == NULL)
947                         continue;
948                 err = obd_iocontrol(cmd, tgt->ltd_exp, len, lk, uarg);
949                 if (err) {
950                         if (tgt->ltd_active) {
951                                 /* permanent error */
952                                 CERROR("%s: iocontrol MDC %s on MDT"
953                                        " idx %d cmd %x: err = %d\n",
954                                        class_exp2obd(lmv->exp)->obd_name,
955                                        tgt->ltd_uuid.uuid, i, cmd, err);
956                                 rc = err;
957                                 lk->lk_flags |= LK_FLG_STOP;
958                                 /* unregister from previous MDS */
959                                 for (j = 0; j < i; j++) {
960                                         tgt = lmv->tgts[j];
961                                         if (tgt == NULL || tgt->ltd_exp == NULL)
962                                                 continue;
963                                         obd_iocontrol(cmd, tgt->ltd_exp, len,
964                                                       lk, uarg);
965                                 }
966                                 RETURN(rc);
967                         }
968                         /* else: transient error.
969                          * kuc will register to the missing MDT
970                          * when it is back */
971                 } else {
972                         any_set = true;
973                 }
974         }
975
976         if (!any_set)
977                 /* no registration done: return error */
978                 RETURN(-ENOTCONN);
979
980         /* at least one registration done, with no failure */
981         filp = fget(lk->lk_wfd);
982         if (filp == NULL)
983                 RETURN(-EBADF);
984
985         OBD_ALLOC_PTR(kcd);
986         if (kcd == NULL) {
987                 fput(filp);
988                 RETURN(-ENOMEM);
989         }
990         kcd->kcd_magic = KKUC_CT_DATA_MAGIC;
991         kcd->kcd_uuid = lmv->cluuid;
992         kcd->kcd_archive = lk->lk_data;
993
994         rc = libcfs_kkuc_group_add(filp, lk->lk_uid, lk->lk_group, kcd);
995         if (rc != 0) {
996                 if (filp != NULL)
997                         fput(filp);
998                 OBD_FREE_PTR(kcd);
999         }
1000
1001         RETURN(rc);
1002 }
1003
1004
1005
1006
1007 static int lmv_iocontrol(unsigned int cmd, struct obd_export *exp,
1008                          int len, void *karg, void *uarg)
1009 {
1010         struct obd_device       *obddev = class_exp2obd(exp);
1011         struct lmv_obd          *lmv = &obddev->u.lmv;
1012         struct lmv_tgt_desc     *tgt = NULL;
1013         __u32                    i = 0;
1014         int                      rc = 0;
1015         int                      set = 0;
1016         __u32                    count = lmv->desc.ld_tgt_count;
1017         ENTRY;
1018
1019         if (count == 0)
1020                 RETURN(-ENOTTY);
1021
1022         switch (cmd) {
1023         case IOC_OBD_STATFS: {
1024                 struct obd_ioctl_data *data = karg;
1025                 struct obd_device *mdc_obd;
1026                 struct obd_statfs stat_buf = {0};
1027                 __u32 index;
1028
1029                 memcpy(&index, data->ioc_inlbuf2, sizeof(__u32));
1030                 if ((index >= count))
1031                         RETURN(-ENODEV);
1032
1033                 tgt = lmv->tgts[index];
1034                 if (tgt == NULL || !tgt->ltd_active)
1035                         RETURN(-ENODATA);
1036
1037                 mdc_obd = class_exp2obd(tgt->ltd_exp);
1038                 if (!mdc_obd)
1039                         RETURN(-EINVAL);
1040
1041                 /* copy UUID */
1042                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(mdc_obd),
1043                                  min((int) data->ioc_plen2,
1044                                      (int) sizeof(struct obd_uuid))))
1045                         RETURN(-EFAULT);
1046
1047                 rc = obd_statfs(NULL, tgt->ltd_exp, &stat_buf,
1048                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
1049                                 0);
1050                 if (rc)
1051                         RETURN(rc);
1052                 if (copy_to_user(data->ioc_pbuf1, &stat_buf,
1053                                  min((int) data->ioc_plen1,
1054                                      (int) sizeof(stat_buf))))
1055                         RETURN(-EFAULT);
1056                 break;
1057         }
1058         case OBD_IOC_QUOTACTL: {
1059                 struct if_quotactl *qctl = karg;
1060                 struct obd_quotactl *oqctl;
1061
1062                 if (qctl->qc_valid == QC_MDTIDX) {
1063                         if (count <= qctl->qc_idx)
1064                                 RETURN(-EINVAL);
1065
1066                         tgt = lmv->tgts[qctl->qc_idx];
1067                         if (tgt == NULL || tgt->ltd_exp == NULL)
1068                                 RETURN(-EINVAL);
1069                 } else if (qctl->qc_valid == QC_UUID) {
1070                         for (i = 0; i < count; i++) {
1071                                 tgt = lmv->tgts[i];
1072                                 if (tgt == NULL)
1073                                         continue;
1074                                 if (!obd_uuid_equals(&tgt->ltd_uuid,
1075                                                      &qctl->obd_uuid))
1076                                         continue;
1077
1078                                 if (tgt->ltd_exp == NULL)
1079                                         RETURN(-EINVAL);
1080
1081                                 break;
1082                         }
1083                 } else {
1084                         RETURN(-EINVAL);
1085                 }
1086
1087                 if (i >= count)
1088                         RETURN(-EAGAIN);
1089
1090                 LASSERT(tgt != NULL && tgt->ltd_exp != NULL);
1091                 OBD_ALLOC_PTR(oqctl);
1092                 if (!oqctl)
1093                         RETURN(-ENOMEM);
1094
1095                 QCTL_COPY(oqctl, qctl);
1096                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
1097                 if (rc == 0) {
1098                         QCTL_COPY(qctl, oqctl);
1099                         qctl->qc_valid = QC_MDTIDX;
1100                         qctl->obd_uuid = tgt->ltd_uuid;
1101                 }
1102                 OBD_FREE_PTR(oqctl);
1103                 break;
1104         }
1105         case OBD_IOC_CHANGELOG_SEND:
1106         case OBD_IOC_CHANGELOG_CLEAR: {
1107                 struct ioc_changelog *icc = karg;
1108
1109                 if (icc->icc_mdtindex >= count)
1110                         RETURN(-ENODEV);
1111
1112                 tgt = lmv->tgts[icc->icc_mdtindex];
1113                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active)
1114                         RETURN(-ENODEV);
1115                 rc = obd_iocontrol(cmd, tgt->ltd_exp, sizeof(*icc), icc, NULL);
1116                 break;
1117         }
1118         case LL_IOC_GET_CONNECT_FLAGS: {
1119                 tgt = lmv->tgts[0];
1120                 if (tgt == NULL || tgt->ltd_exp == NULL)
1121                         RETURN(-ENODATA);
1122                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1123                 break;
1124         }
1125         case OBD_IOC_FID2PATH: {
1126                 rc = lmv_fid2path(exp, len, karg, uarg);
1127                 break;
1128         }
1129         case LL_IOC_HSM_STATE_GET:
1130         case LL_IOC_HSM_STATE_SET:
1131         case LL_IOC_HSM_ACTION: {
1132                 struct md_op_data       *op_data = karg;
1133
1134                 tgt = lmv_find_target(lmv, &op_data->op_fid1);
1135                 if (IS_ERR(tgt))
1136                         RETURN(PTR_ERR(tgt));
1137
1138                 if (tgt->ltd_exp == NULL)
1139                         RETURN(-EINVAL);
1140
1141                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1142                 break;
1143         }
1144         case LL_IOC_HSM_PROGRESS: {
1145                 const struct hsm_progress_kernel *hpk = karg;
1146
1147                 tgt = lmv_find_target(lmv, &hpk->hpk_fid);
1148                 if (IS_ERR(tgt))
1149                         RETURN(PTR_ERR(tgt));
1150                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1151                 break;
1152         }
1153         case LL_IOC_HSM_REQUEST: {
1154                 struct hsm_user_request *hur = karg;
1155                 unsigned int reqcount = hur->hur_request.hr_itemcount;
1156
1157                 if (reqcount == 0)
1158                         RETURN(0);
1159
1160                 /* if the request is about a single fid
1161                  * or if there is a single MDS, no need to split
1162                  * the request. */
1163                 if (reqcount == 1 || count == 1) {
1164                         tgt = lmv_find_target(lmv,
1165                                               &hur->hur_user_item[0].hui_fid);
1166                         if (IS_ERR(tgt))
1167                                 RETURN(PTR_ERR(tgt));
1168                         rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1169                 } else {
1170                         /* split fid list to their respective MDS */
1171                         for (i = 0; i < count; i++) {
1172                                 unsigned int            nr, reqlen;
1173                                 int                     rc1;
1174                                 struct hsm_user_request *req;
1175
1176                                 tgt = lmv->tgts[i];
1177                                 if (tgt == NULL || tgt->ltd_exp == NULL)
1178                                         continue;
1179
1180                                 nr = lmv_hsm_req_count(lmv, hur, tgt);
1181                                 if (nr == 0) /* nothing for this MDS */
1182                                         continue;
1183
1184                                 /* build a request with fids for this MDS */
1185                                 reqlen = offsetof(typeof(*hur),
1186                                                   hur_user_item[nr])
1187                                                 + hur->hur_request.hr_data_len;
1188                                 OBD_ALLOC_LARGE(req, reqlen);
1189                                 if (req == NULL)
1190                                         RETURN(-ENOMEM);
1191
1192                                 lmv_hsm_req_build(lmv, hur, tgt, req);
1193
1194                                 rc1 = obd_iocontrol(cmd, tgt->ltd_exp, reqlen,
1195                                                     req, uarg);
1196                                 if (rc1 != 0 && rc == 0)
1197                                         rc = rc1;
1198                                 OBD_FREE_LARGE(req, reqlen);
1199                         }
1200                 }
1201                 break;
1202         }
1203         case LL_IOC_LOV_SWAP_LAYOUTS: {
1204                 struct md_op_data       *op_data = karg;
1205                 struct lmv_tgt_desc     *tgt1, *tgt2;
1206
1207                 tgt1 = lmv_find_target(lmv, &op_data->op_fid1);
1208                 if (IS_ERR(tgt1))
1209                         RETURN(PTR_ERR(tgt1));
1210
1211                 tgt2 = lmv_find_target(lmv, &op_data->op_fid2);
1212                 if (IS_ERR(tgt2))
1213                         RETURN(PTR_ERR(tgt2));
1214
1215                 if ((tgt1->ltd_exp == NULL) || (tgt2->ltd_exp == NULL))
1216                         RETURN(-EINVAL);
1217
1218                 /* only files on same MDT can have their layouts swapped */
1219                 if (tgt1->ltd_idx != tgt2->ltd_idx)
1220                         RETURN(-EPERM);
1221
1222                 rc = obd_iocontrol(cmd, tgt1->ltd_exp, len, karg, uarg);
1223                 break;
1224         }
1225         case LL_IOC_HSM_CT_START: {
1226                 struct lustre_kernelcomm *lk = karg;
1227                 if (lk->lk_flags & LK_FLG_STOP)
1228                         rc = lmv_hsm_ct_unregister(lmv, cmd, len, lk, uarg);
1229                 else
1230                         rc = lmv_hsm_ct_register(lmv, cmd, len, lk, uarg);
1231                 break;
1232         }
1233         default:
1234                 for (i = 0; i < count; i++) {
1235                         struct obd_device *mdc_obd;
1236                         int err;
1237
1238                         tgt = lmv->tgts[i];
1239                         if (tgt == NULL || tgt->ltd_exp == NULL)
1240                                 continue;
1241                         /* ll_umount_begin() sets force flag but for lmv, not
1242                          * mdc. Let's pass it through */
1243                         mdc_obd = class_exp2obd(tgt->ltd_exp);
1244                         mdc_obd->obd_force = obddev->obd_force;
1245                         err = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1246                         if (err == -ENODATA && cmd == OBD_IOC_POLL_QUOTACHECK) {
1247                                 RETURN(err);
1248                         } else if (err) {
1249                                 if (tgt->ltd_active) {
1250                                         CERROR("error: iocontrol MDC %s on MDT"
1251                                                " idx %d cmd %x: err = %d\n",
1252                                                tgt->ltd_uuid.uuid, i, cmd, err);
1253                                         if (!rc)
1254                                                 rc = err;
1255                                 }
1256                         } else
1257                                 set = 1;
1258                 }
1259                 if (!set && !rc)
1260                         rc = -EIO;
1261         }
1262         RETURN(rc);
1263 }
1264
1265 #if 0
1266 static int lmv_all_chars_policy(int count, const char *name,
1267                                 int len)
1268 {
1269         unsigned int c = 0;
1270
1271         while (len > 0)
1272                 c += name[--len];
1273         c = c % count;
1274         return c;
1275 }
1276
1277 static int lmv_nid_policy(struct lmv_obd *lmv)
1278 {
1279         struct obd_import *imp;
1280         __u32              id;
1281
1282         /*
1283          * XXX: To get nid we assume that underlying obd device is mdc.
1284          */
1285         imp = class_exp2cliimp(lmv->tgts[0].ltd_exp);
1286         id = imp->imp_connection->c_self ^ (imp->imp_connection->c_self >> 32);
1287         return id % lmv->desc.ld_tgt_count;
1288 }
1289
1290 static int lmv_choose_mds(struct lmv_obd *lmv, struct md_op_data *op_data,
1291                           placement_policy_t placement)
1292 {
1293         switch (placement) {
1294         case PLACEMENT_CHAR_POLICY:
1295                 return lmv_all_chars_policy(lmv->desc.ld_tgt_count,
1296                                             op_data->op_name,
1297                                             op_data->op_namelen);
1298         case PLACEMENT_NID_POLICY:
1299                 return lmv_nid_policy(lmv);
1300
1301         default:
1302                 break;
1303         }
1304
1305         CERROR("Unsupported placement policy %x\n", placement);
1306         return -EINVAL;
1307 }
1308 #endif
1309
1310 /**
1311  * This is _inode_ placement policy function (not name).
1312  */
1313 static int lmv_placement_policy(struct obd_device *obd,
1314                                 struct md_op_data *op_data,
1315                                 mdsno_t *mds)
1316 {
1317         struct lmv_obd          *lmv = &obd->u.lmv;
1318         ENTRY;
1319
1320         LASSERT(mds != NULL);
1321
1322         if (lmv->desc.ld_tgt_count == 1) {
1323                 *mds = 0;
1324                 RETURN(0);
1325         }
1326
1327         /**
1328          * If stripe_offset is provided during setdirstripe
1329          * (setdirstripe -i xx), xx MDS will be choosen.
1330          */
1331         if (op_data->op_cli_flags & CLI_SET_MEA && op_data->op_data != NULL) {
1332                 struct lmv_user_md *lum;
1333
1334                 lum = op_data->op_data;
1335
1336                 if (le32_to_cpu(lum->lum_stripe_offset) != (__u32)-1) {
1337                         *mds = le32_to_cpu(lum->lum_stripe_offset);
1338                 } else {
1339                         /* -1 means default, which will be in the same MDT with
1340                          * the stripe */
1341                         *mds = op_data->op_mds;
1342                         lum->lum_stripe_offset = cpu_to_le32(op_data->op_mds);
1343                 }
1344         } else {
1345                 /* Allocate new fid on target according to operation type and
1346                  * parent home mds. */
1347                 *mds = op_data->op_mds;
1348         }
1349
1350         RETURN(0);
1351 }
1352
1353 int __lmv_fid_alloc(struct lmv_obd *lmv, struct lu_fid *fid,
1354                     mdsno_t mds)
1355 {
1356         struct lmv_tgt_desc     *tgt;
1357         int                      rc;
1358         ENTRY;
1359
1360         tgt = lmv_get_target(lmv, mds, NULL);
1361         if (IS_ERR(tgt))
1362                 RETURN(PTR_ERR(tgt));
1363
1364         /*
1365          * New seq alloc and FLD setup should be atomic. Otherwise we may find
1366          * on server that seq in new allocated fid is not yet known.
1367          */
1368         mutex_lock(&tgt->ltd_fid_mutex);
1369
1370         if (tgt->ltd_active == 0 || tgt->ltd_exp == NULL)
1371                 GOTO(out, rc = -ENODEV);
1372
1373         /*
1374          * Asking underlying tgt layer to allocate new fid.
1375          */
1376         rc = obd_fid_alloc(NULL, tgt->ltd_exp, fid, NULL);
1377         if (rc > 0) {
1378                 LASSERT(fid_is_sane(fid));
1379                 rc = 0;
1380         }
1381
1382         EXIT;
1383 out:
1384         mutex_unlock(&tgt->ltd_fid_mutex);
1385         return rc;
1386 }
1387
1388 int lmv_fid_alloc(const struct lu_env *env, struct obd_export *exp,
1389                   struct lu_fid *fid, struct md_op_data *op_data)
1390 {
1391         struct obd_device     *obd = class_exp2obd(exp);
1392         struct lmv_obd        *lmv = &obd->u.lmv;
1393         mdsno_t                mds = 0;
1394         int                    rc;
1395         ENTRY;
1396
1397         LASSERT(op_data != NULL);
1398         LASSERT(fid != NULL);
1399
1400         rc = lmv_placement_policy(obd, op_data, &mds);
1401         if (rc) {
1402                 CERROR("Can't get target for allocating fid, "
1403                        "rc %d\n", rc);
1404                 RETURN(rc);
1405         }
1406
1407         rc = __lmv_fid_alloc(lmv, fid, mds);
1408         if (rc) {
1409                 CERROR("Can't alloc new fid, rc %d\n", rc);
1410                 RETURN(rc);
1411         }
1412
1413         RETURN(rc);
1414 }
1415
1416 static int lmv_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
1417 {
1418         struct lmv_obd  *lmv = &obd->u.lmv;
1419         struct lmv_desc *desc;
1420         int             rc;
1421         ENTRY;
1422
1423         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
1424                 CERROR("LMV setup requires a descriptor\n");
1425                 RETURN(-EINVAL);
1426         }
1427
1428         desc = (struct lmv_desc *)lustre_cfg_buf(lcfg, 1);
1429         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
1430                 CERROR("Lmv descriptor size wrong: %d > %d\n",
1431                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
1432                 RETURN(-EINVAL);
1433         }
1434
1435         OBD_ALLOC(lmv->tgts, sizeof(*lmv->tgts) * 32);
1436         if (lmv->tgts == NULL)
1437                 RETURN(-ENOMEM);
1438         lmv->tgts_size = 32;
1439
1440         obd_str2uuid(&lmv->desc.ld_uuid, desc->ld_uuid.uuid);
1441         lmv->desc.ld_tgt_count = 0;
1442         lmv->desc.ld_active_tgt_count = 0;
1443         lmv->max_cookiesize = 0;
1444         lmv->max_def_easize = 0;
1445         lmv->max_easize = 0;
1446         lmv->lmv_placement = PLACEMENT_CHAR_POLICY;
1447
1448         spin_lock_init(&lmv->lmv_lock);
1449         mutex_init(&lmv->init_mutex);
1450
1451 #ifdef LPROCFS
1452         obd->obd_vars = lprocfs_lmv_obd_vars;
1453         lprocfs_seq_obd_setup(obd);
1454         lprocfs_alloc_md_stats(obd, 0);
1455         rc = lprocfs_seq_create(obd->obd_proc_entry, "target_obd",
1456                                 0444, &lmv_proc_target_fops, obd);
1457         if (rc)
1458                 CWARN("%s: error adding LMV target_obd file: rc = %d\n",
1459                       obd->obd_name, rc);
1460 #endif
1461         rc = fld_client_init(&lmv->lmv_fld, obd->obd_name,
1462                              LUSTRE_CLI_FLD_HASH_DHT);
1463         if (rc) {
1464                 CERROR("Can't init FLD, err %d\n", rc);
1465                 GOTO(out, rc);
1466         }
1467
1468         RETURN(0);
1469
1470 out:
1471         return rc;
1472 }
1473
1474 static int lmv_cleanup(struct obd_device *obd)
1475 {
1476         struct lmv_obd   *lmv = &obd->u.lmv;
1477         ENTRY;
1478
1479         fld_client_fini(&lmv->lmv_fld);
1480         if (lmv->tgts != NULL) {
1481                 int i;
1482                 for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1483                         if (lmv->tgts[i] == NULL)
1484                                 continue;
1485                         lmv_del_target(lmv, i);
1486                 }
1487                 OBD_FREE(lmv->tgts, sizeof(*lmv->tgts) * lmv->tgts_size);
1488                 lmv->tgts_size = 0;
1489         }
1490         RETURN(0);
1491 }
1492
1493 static int lmv_process_config(struct obd_device *obd, obd_count len, void *buf)
1494 {
1495         struct lustre_cfg       *lcfg = buf;
1496         struct obd_uuid         obd_uuid;
1497         int                     gen;
1498         __u32                   index;
1499         int                     rc;
1500         ENTRY;
1501
1502         switch (lcfg->lcfg_command) {
1503         case LCFG_ADD_MDC:
1504                 /* modify_mdc_tgts add 0:lustre-clilmv  1:lustre-MDT0000_UUID
1505                  * 2:0  3:1  4:lustre-MDT0000-mdc_UUID */
1506                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(obd_uuid.uuid))
1507                         GOTO(out, rc = -EINVAL);
1508
1509                 obd_str2uuid(&obd_uuid,  lustre_cfg_buf(lcfg, 1));
1510
1511                 if (sscanf(lustre_cfg_buf(lcfg, 2), "%u", &index) != 1)
1512                         GOTO(out, rc = -EINVAL);
1513                 if (sscanf(lustre_cfg_buf(lcfg, 3), "%d", &gen) != 1)
1514                         GOTO(out, rc = -EINVAL);
1515                 rc = lmv_add_target(obd, &obd_uuid, index, gen);
1516                 GOTO(out, rc);
1517         default:
1518                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1519                 GOTO(out, rc = -EINVAL);
1520         }
1521 out:
1522         RETURN(rc);
1523 }
1524
1525 static int lmv_statfs(const struct lu_env *env, struct obd_export *exp,
1526                       struct obd_statfs *osfs, __u64 max_age, __u32 flags)
1527 {
1528         struct obd_device       *obd = class_exp2obd(exp);
1529         struct lmv_obd          *lmv = &obd->u.lmv;
1530         struct obd_statfs       *temp;
1531         int                      rc = 0;
1532         __u32                    i;
1533         ENTRY;
1534
1535         rc = lmv_check_connect(obd);
1536         if (rc)
1537                 RETURN(rc);
1538
1539         OBD_ALLOC(temp, sizeof(*temp));
1540         if (temp == NULL)
1541                 RETURN(-ENOMEM);
1542
1543         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1544                 if (lmv->tgts[i] == NULL || lmv->tgts[i]->ltd_exp == NULL)
1545                         continue;
1546
1547                 rc = obd_statfs(env, lmv->tgts[i]->ltd_exp, temp,
1548                                 max_age, flags);
1549                 if (rc) {
1550                         CERROR("can't stat MDS #%d (%s), error %d\n", i,
1551                                lmv->tgts[i]->ltd_exp->exp_obd->obd_name,
1552                                rc);
1553                         GOTO(out_free_temp, rc);
1554                 }
1555
1556                 if (i == 0) {
1557                         *osfs = *temp;
1558                         /* If the statfs is from mount, it will needs
1559                          * retrieve necessary information from MDT0.
1560                          * i.e. mount does not need the merged osfs
1561                          * from all of MDT.
1562                          * And also clients can be mounted as long as
1563                          * MDT0 is in service*/
1564                         if (flags & OBD_STATFS_FOR_MDT0)
1565                                 GOTO(out_free_temp, rc);
1566                 } else {
1567                         osfs->os_bavail += temp->os_bavail;
1568                         osfs->os_blocks += temp->os_blocks;
1569                         osfs->os_ffree += temp->os_ffree;
1570                         osfs->os_files += temp->os_files;
1571                 }
1572         }
1573
1574         EXIT;
1575 out_free_temp:
1576         OBD_FREE(temp, sizeof(*temp));
1577         return rc;
1578 }
1579
1580 static int lmv_getstatus(struct obd_export *exp,
1581                          struct lu_fid *fid,
1582                          struct obd_capa **pc)
1583 {
1584         struct obd_device    *obd = exp->exp_obd;
1585         struct lmv_obd       *lmv = &obd->u.lmv;
1586         int                   rc;
1587         ENTRY;
1588
1589         rc = lmv_check_connect(obd);
1590         if (rc)
1591                 RETURN(rc);
1592
1593         rc = md_getstatus(lmv->tgts[0]->ltd_exp, fid, pc);
1594         RETURN(rc);
1595 }
1596
1597 static int lmv_getxattr(struct obd_export *exp, const struct lu_fid *fid,
1598                         struct obd_capa *oc, obd_valid valid, const char *name,
1599                         const char *input, int input_size, int output_size,
1600                         int flags, struct ptlrpc_request **request)
1601 {
1602         struct obd_device      *obd = exp->exp_obd;
1603         struct lmv_obd         *lmv = &obd->u.lmv;
1604         struct lmv_tgt_desc    *tgt;
1605         int                     rc;
1606         ENTRY;
1607
1608         rc = lmv_check_connect(obd);
1609         if (rc)
1610                 RETURN(rc);
1611
1612         tgt = lmv_find_target(lmv, fid);
1613         if (IS_ERR(tgt))
1614                 RETURN(PTR_ERR(tgt));
1615
1616         rc = md_getxattr(tgt->ltd_exp, fid, oc, valid, name, input,
1617                          input_size, output_size, flags, request);
1618
1619         RETURN(rc);
1620 }
1621
1622 static int lmv_setxattr(struct obd_export *exp, const struct lu_fid *fid,
1623                         struct obd_capa *oc, obd_valid valid, const char *name,
1624                         const char *input, int input_size, int output_size,
1625                         int flags, __u32 suppgid,
1626                         struct ptlrpc_request **request)
1627 {
1628         struct obd_device      *obd = exp->exp_obd;
1629         struct lmv_obd         *lmv = &obd->u.lmv;
1630         struct lmv_tgt_desc    *tgt;
1631         int                     rc;
1632         ENTRY;
1633
1634         rc = lmv_check_connect(obd);
1635         if (rc)
1636                 RETURN(rc);
1637
1638         tgt = lmv_find_target(lmv, fid);
1639         if (IS_ERR(tgt))
1640                 RETURN(PTR_ERR(tgt));
1641
1642         rc = md_setxattr(tgt->ltd_exp, fid, oc, valid, name, input,
1643                          input_size, output_size, flags, suppgid,
1644                          request);
1645
1646         RETURN(rc);
1647 }
1648
1649 static int lmv_getattr(struct obd_export *exp, struct md_op_data *op_data,
1650                        struct ptlrpc_request **request)
1651 {
1652         struct obd_device       *obd = exp->exp_obd;
1653         struct lmv_obd          *lmv = &obd->u.lmv;
1654         struct lmv_tgt_desc     *tgt;
1655         int                      rc;
1656         ENTRY;
1657
1658         rc = lmv_check_connect(obd);
1659         if (rc)
1660                 RETURN(rc);
1661
1662         tgt = lmv_find_target(lmv, &op_data->op_fid1);
1663         if (IS_ERR(tgt))
1664                 RETURN(PTR_ERR(tgt));
1665
1666         if (op_data->op_flags & MF_GET_MDT_IDX) {
1667                 op_data->op_mds = tgt->ltd_idx;
1668                 RETURN(0);
1669         }
1670
1671         rc = md_getattr(tgt->ltd_exp, op_data, request);
1672
1673         RETURN(rc);
1674 }
1675
1676 static int lmv_null_inode(struct obd_export *exp, const struct lu_fid *fid)
1677 {
1678         struct obd_device   *obd = exp->exp_obd;
1679         struct lmv_obd      *lmv = &obd->u.lmv;
1680         __u32                i;
1681         int                  rc;
1682         ENTRY;
1683
1684         rc = lmv_check_connect(obd);
1685         if (rc)
1686                 RETURN(rc);
1687
1688         CDEBUG(D_INODE, "CBDATA for "DFID"\n", PFID(fid));
1689
1690         /*
1691          * With DNE every object can have two locks in different namespaces:
1692          * lookup lock in space of MDT storing direntry and update/open lock in
1693          * space of MDT storing inode.
1694          */
1695         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1696                 if (lmv->tgts[i] == NULL || lmv->tgts[i]->ltd_exp == NULL)
1697                         continue;
1698                 md_null_inode(lmv->tgts[i]->ltd_exp, fid);
1699         }
1700
1701         RETURN(0);
1702 }
1703
1704 static int lmv_find_cbdata(struct obd_export *exp, const struct lu_fid *fid,
1705                            ldlm_iterator_t it, void *data)
1706 {
1707         struct obd_device       *obd = exp->exp_obd;
1708         struct lmv_obd          *lmv = &obd->u.lmv;
1709         int                     i;
1710         int                     tgt;
1711         int                     rc;
1712         ENTRY;
1713
1714         rc = lmv_check_connect(obd);
1715         if (rc)
1716                 RETURN(rc);
1717
1718         CDEBUG(D_INODE, "CBDATA for "DFID"\n", PFID(fid));
1719
1720         /*
1721          * With DNE every object can have two locks in different namespaces:
1722          * lookup lock in space of MDT storing direntry and update/open lock in
1723          * space of MDT storing inode.  Try the MDT that the FID maps to first,
1724          * since this can be easily found, and only try others if that fails.
1725          */
1726         for (i = 0, tgt = lmv_find_target_index(lmv, fid);
1727              i < lmv->desc.ld_tgt_count;
1728              i++, tgt = (tgt + 1) % lmv->desc.ld_tgt_count) {
1729                 if (tgt < 0) {
1730                         CDEBUG(D_HA, "%s: "DFID" is inaccessible: rc = %d\n",
1731                                obd->obd_name, PFID(fid), tgt);
1732                         tgt = 0;
1733                 }
1734
1735                 if (lmv->tgts[tgt] == NULL ||
1736                     lmv->tgts[tgt]->ltd_exp == NULL)
1737                         continue;
1738
1739                 rc = md_find_cbdata(lmv->tgts[tgt]->ltd_exp, fid, it, data);
1740                 if (rc)
1741                         RETURN(rc);
1742         }
1743
1744         RETURN(rc);
1745 }
1746
1747
1748 static int lmv_close(struct obd_export *exp, struct md_op_data *op_data,
1749                      struct md_open_data *mod, struct ptlrpc_request **request)
1750 {
1751         struct obd_device     *obd = exp->exp_obd;
1752         struct lmv_obd        *lmv = &obd->u.lmv;
1753         struct lmv_tgt_desc   *tgt;
1754         int                    rc;
1755         ENTRY;
1756
1757         rc = lmv_check_connect(obd);
1758         if (rc)
1759                 RETURN(rc);
1760
1761         tgt = lmv_find_target(lmv, &op_data->op_fid1);
1762         if (IS_ERR(tgt))
1763                 RETURN(PTR_ERR(tgt));
1764
1765         CDEBUG(D_INODE, "CLOSE "DFID"\n", PFID(&op_data->op_fid1));
1766         rc = md_close(tgt->ltd_exp, op_data, mod, request);
1767         RETURN(rc);
1768 }
1769
1770 /**
1771  * Choosing the MDT by name or FID in @op_data.
1772  * For non-striped directory, it will locate MDT by fid.
1773  * For striped-directory, it will locate MDT by name. And also
1774  * it will reset op_fid1 with the FID of the choosen stripe.
1775  **/
1776 struct lmv_tgt_desc *
1777 lmv_locate_target_for_name(struct lmv_obd *lmv, struct lmv_stripe_md *lsm,
1778                            const char *name, int namelen, struct lu_fid *fid,
1779                            mdsno_t *mds)
1780 {
1781         struct lmv_tgt_desc     *tgt;
1782         const struct lmv_oinfo  *oinfo;
1783
1784         oinfo = lsm_name_to_stripe_info(lsm, name, namelen);
1785         if (IS_ERR(oinfo))
1786                 RETURN((void *)oinfo);
1787         *fid = oinfo->lmo_fid;
1788         *mds = oinfo->lmo_mds;
1789         tgt = lmv_get_target(lmv, *mds, NULL);
1790
1791         CDEBUG(D_INFO, "locate on mds %u "DFID"\n", *mds, PFID(fid));
1792         return tgt;
1793 }
1794
1795 struct lmv_tgt_desc
1796 *lmv_locate_mds(struct lmv_obd *lmv, struct md_op_data *op_data,
1797                 struct lu_fid *fid)
1798 {
1799         struct lmv_stripe_md    *lsm = op_data->op_mea1;
1800         struct lmv_tgt_desc     *tgt;
1801
1802         if (lsm == NULL || op_data->op_namelen == 0) {
1803                 tgt = lmv_find_target(lmv, fid);
1804                 if (IS_ERR(tgt))
1805                         return tgt;
1806
1807                 op_data->op_mds = tgt->ltd_idx;
1808                 return tgt;
1809         }
1810
1811         return lmv_locate_target_for_name(lmv, lsm, op_data->op_name,
1812                                           op_data->op_namelen, fid,
1813                                           &op_data->op_mds);
1814 }
1815
1816 int lmv_create(struct obd_export *exp, struct md_op_data *op_data,
1817                const void *data, int datalen, int mode, __u32 uid,
1818                __u32 gid, cfs_cap_t cap_effective, __u64 rdev,
1819                struct ptlrpc_request **request)
1820 {
1821         struct obd_device       *obd = exp->exp_obd;
1822         struct lmv_obd          *lmv = &obd->u.lmv;
1823         struct lmv_tgt_desc     *tgt;
1824         int                      rc;
1825         ENTRY;
1826
1827         rc = lmv_check_connect(obd);
1828         if (rc)
1829                 RETURN(rc);
1830
1831         if (!lmv->desc.ld_active_tgt_count)
1832                 RETURN(-EIO);
1833
1834         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
1835         if (IS_ERR(tgt))
1836                 RETURN(PTR_ERR(tgt));
1837
1838         CDEBUG(D_INODE, "CREATE name '%.*s' on "DFID" -> mds #%x\n",
1839                op_data->op_namelen, op_data->op_name, PFID(&op_data->op_fid1),
1840                op_data->op_mds);
1841
1842         rc = lmv_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
1843         if (rc)
1844                 RETURN(rc);
1845
1846         /* Send the create request to the MDT where the object
1847          * will be located */
1848         tgt = lmv_find_target(lmv, &op_data->op_fid2);
1849         if (IS_ERR(tgt))
1850                 RETURN(PTR_ERR(tgt));
1851
1852         op_data->op_mds = tgt->ltd_idx;
1853
1854         CDEBUG(D_INODE, "CREATE obj "DFID" -> mds #%x\n",
1855                PFID(&op_data->op_fid2), op_data->op_mds);
1856
1857         op_data->op_flags |= MF_MDC_CANCEL_FID1;
1858         rc = md_create(tgt->ltd_exp, op_data, data, datalen, mode, uid, gid,
1859                        cap_effective, rdev, request);
1860         if (rc == 0) {
1861                 if (*request == NULL)
1862                         RETURN(rc);
1863                 CDEBUG(D_INODE, "Created - "DFID"\n", PFID(&op_data->op_fid2));
1864         }
1865         RETURN(rc);
1866 }
1867
1868 static int lmv_done_writing(struct obd_export *exp,
1869                             struct md_op_data *op_data,
1870                             struct md_open_data *mod)
1871 {
1872         struct obd_device     *obd = exp->exp_obd;
1873         struct lmv_obd        *lmv = &obd->u.lmv;
1874         struct lmv_tgt_desc   *tgt;
1875         int                    rc;
1876         ENTRY;
1877
1878         rc = lmv_check_connect(obd);
1879         if (rc)
1880                 RETURN(rc);
1881
1882         tgt = lmv_find_target(lmv, &op_data->op_fid1);
1883         if (IS_ERR(tgt))
1884                 RETURN(PTR_ERR(tgt));
1885
1886         rc = md_done_writing(tgt->ltd_exp, op_data, mod);
1887         RETURN(rc);
1888 }
1889
1890 static int
1891 lmv_enqueue(struct obd_export *exp, struct ldlm_enqueue_info *einfo,
1892             const union ldlm_policy_data *policy,
1893             struct lookup_intent *it, struct md_op_data *op_data,
1894             struct lustre_handle *lockh, __u64 extra_lock_flags)
1895 {
1896         struct obd_device        *obd = exp->exp_obd;
1897         struct lmv_obd           *lmv = &obd->u.lmv;
1898         struct lmv_tgt_desc      *tgt;
1899         int                       rc;
1900         ENTRY;
1901
1902         rc = lmv_check_connect(obd);
1903         if (rc)
1904                 RETURN(rc);
1905
1906         CDEBUG(D_INODE, "ENQUEUE '%s' on "DFID"\n",
1907                LL_IT2STR(it), PFID(&op_data->op_fid1));
1908
1909         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
1910         if (IS_ERR(tgt))
1911                 RETURN(PTR_ERR(tgt));
1912
1913         CDEBUG(D_INODE, "ENQUEUE '%s' on "DFID" -> mds #%d\n",
1914                LL_IT2STR(it), PFID(&op_data->op_fid1), tgt->ltd_idx);
1915
1916         rc = md_enqueue(tgt->ltd_exp, einfo, policy, it, op_data, lockh,
1917                         extra_lock_flags);
1918
1919         RETURN(rc);
1920 }
1921
1922 static int
1923 lmv_getattr_name(struct obd_export *exp,struct md_op_data *op_data,
1924                  struct ptlrpc_request **preq)
1925 {
1926         struct ptlrpc_request   *req = NULL;
1927         struct obd_device       *obd = exp->exp_obd;
1928         struct lmv_obd          *lmv = &obd->u.lmv;
1929         struct lmv_tgt_desc     *tgt;
1930         struct mdt_body         *body;
1931         int                      rc;
1932         ENTRY;
1933
1934         rc = lmv_check_connect(obd);
1935         if (rc)
1936                 RETURN(rc);
1937
1938         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
1939         if (IS_ERR(tgt))
1940                 RETURN(PTR_ERR(tgt));
1941
1942         CDEBUG(D_INODE, "GETATTR_NAME for %*s on "DFID" -> mds #%d\n",
1943                op_data->op_namelen, op_data->op_name, PFID(&op_data->op_fid1),
1944                tgt->ltd_idx);
1945
1946         rc = md_getattr_name(tgt->ltd_exp, op_data, preq);
1947         if (rc != 0)
1948                 RETURN(rc);
1949
1950         body = req_capsule_server_get(&(*preq)->rq_pill, &RMF_MDT_BODY);
1951         LASSERT(body != NULL);
1952
1953         if (body->mbo_valid & OBD_MD_MDS) {
1954                 struct lu_fid rid = body->mbo_fid1;
1955                 CDEBUG(D_INODE, "Request attrs for "DFID"\n",
1956                        PFID(&rid));
1957
1958                 tgt = lmv_find_target(lmv, &rid);
1959                 if (IS_ERR(tgt)) {
1960                         ptlrpc_req_finished(*preq);
1961                         preq = NULL;
1962                         RETURN(PTR_ERR(tgt));
1963                 }
1964
1965                 op_data->op_fid1 = rid;
1966                 op_data->op_valid |= OBD_MD_FLCROSSREF;
1967                 op_data->op_namelen = 0;
1968                 op_data->op_name = NULL;
1969                 rc = md_getattr_name(tgt->ltd_exp, op_data, &req);
1970                 ptlrpc_req_finished(*preq);
1971                 *preq = req;
1972         }
1973
1974         RETURN(rc);
1975 }
1976
1977 #define md_op_data_fid(op_data, fl)                     \
1978         (fl == MF_MDC_CANCEL_FID1 ? &op_data->op_fid1 : \
1979          fl == MF_MDC_CANCEL_FID2 ? &op_data->op_fid2 : \
1980          fl == MF_MDC_CANCEL_FID3 ? &op_data->op_fid3 : \
1981          fl == MF_MDC_CANCEL_FID4 ? &op_data->op_fid4 : \
1982          NULL)
1983
1984 static int lmv_early_cancel(struct obd_export *exp, struct lmv_tgt_desc *tgt,
1985                             struct md_op_data *op_data,
1986                             int op_tgt, ldlm_mode_t mode, int bits, int flag)
1987 {
1988         struct lu_fid          *fid = md_op_data_fid(op_data, flag);
1989         struct obd_device      *obd = exp->exp_obd;
1990         struct lmv_obd         *lmv = &obd->u.lmv;
1991         ldlm_policy_data_t      policy = {{ 0 }};
1992         int                     rc = 0;
1993         ENTRY;
1994
1995         if (!fid_is_sane(fid))
1996                 RETURN(0);
1997
1998         if (tgt == NULL) {
1999                 tgt = lmv_find_target(lmv, fid);
2000                 if (IS_ERR(tgt))
2001                         RETURN(PTR_ERR(tgt));
2002         }
2003
2004         if (tgt->ltd_idx != op_tgt) {
2005                 CDEBUG(D_INODE, "EARLY_CANCEL on "DFID"\n", PFID(fid));
2006                 policy.l_inodebits.bits = bits;
2007                 rc = md_cancel_unused(tgt->ltd_exp, fid, &policy,
2008                                       mode, LCF_ASYNC, NULL);
2009         } else {
2010                 CDEBUG(D_INODE,
2011                        "EARLY_CANCEL skip operation target %d on "DFID"\n",
2012                        op_tgt, PFID(fid));
2013                 op_data->op_flags |= flag;
2014                 rc = 0;
2015         }
2016
2017         RETURN(rc);
2018 }
2019
2020 /*
2021  * llite passes fid of an target inode in op_data->op_fid1 and id of directory in
2022  * op_data->op_fid2
2023  */
2024 static int lmv_link(struct obd_export *exp, struct md_op_data *op_data,
2025                     struct ptlrpc_request **request)
2026 {
2027         struct obd_device       *obd = exp->exp_obd;
2028         struct lmv_obd          *lmv = &obd->u.lmv;
2029         struct lmv_tgt_desc     *tgt;
2030         int                      rc;
2031         ENTRY;
2032
2033         rc = lmv_check_connect(obd);
2034         if (rc)
2035                 RETURN(rc);
2036
2037         LASSERT(op_data->op_namelen != 0);
2038
2039         CDEBUG(D_INODE, "LINK "DFID":%*s to "DFID"\n",
2040                PFID(&op_data->op_fid2), op_data->op_namelen,
2041                op_data->op_name, PFID(&op_data->op_fid1));
2042
2043         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2044         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2045         op_data->op_cap = cfs_curproc_cap_pack();
2046         if (op_data->op_mea2 != NULL) {
2047                 struct lmv_stripe_md    *lsm = op_data->op_mea2;
2048                 const struct lmv_oinfo  *oinfo;
2049
2050                 oinfo = lsm_name_to_stripe_info(lsm, op_data->op_name,
2051                                                 op_data->op_namelen);
2052                 if (IS_ERR(oinfo))
2053                         RETURN(PTR_ERR(oinfo));
2054
2055                 op_data->op_fid2 = oinfo->lmo_fid;
2056         }
2057
2058         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid2);
2059         if (IS_ERR(tgt))
2060                 RETURN(PTR_ERR(tgt));
2061
2062         /*
2063          * Cancel UPDATE lock on child (fid1).
2064          */
2065         op_data->op_flags |= MF_MDC_CANCEL_FID2;
2066         rc = lmv_early_cancel(exp, NULL, op_data, tgt->ltd_idx, LCK_EX,
2067                               MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID1);
2068         if (rc != 0)
2069                 RETURN(rc);
2070
2071         rc = md_link(tgt->ltd_exp, op_data, request);
2072
2073         RETURN(rc);
2074 }
2075
2076 static int lmv_rename(struct obd_export *exp, struct md_op_data *op_data,
2077                       const char *old, int oldlen, const char *new, int newlen,
2078                       struct ptlrpc_request **request)
2079 {
2080         struct obd_device       *obd = exp->exp_obd;
2081         struct lmv_obd          *lmv = &obd->u.lmv;
2082         struct lmv_tgt_desc     *src_tgt;
2083         int                     rc;
2084         ENTRY;
2085
2086         LASSERT(oldlen != 0);
2087
2088         CDEBUG(D_INODE, "RENAME %.*s in "DFID":%d to %.*s in "DFID":%d\n",
2089                oldlen, old, PFID(&op_data->op_fid1),
2090                op_data->op_mea1 ? op_data->op_mea1->lsm_md_stripe_count : 0,
2091                newlen, new, PFID(&op_data->op_fid2),
2092                op_data->op_mea2 ? op_data->op_mea2->lsm_md_stripe_count : 0);
2093
2094         rc = lmv_check_connect(obd);
2095         if (rc)
2096                 RETURN(rc);
2097
2098         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2099         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2100         op_data->op_cap = cfs_curproc_cap_pack();
2101         if (op_data->op_cli_flags & CLI_MIGRATE) {
2102                 LASSERTF(fid_is_sane(&op_data->op_fid3), "invalid FID "DFID"\n",
2103                          PFID(&op_data->op_fid3));
2104                 rc = lmv_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
2105                 if (rc)
2106                         RETURN(rc);
2107                 src_tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid3);
2108         } else {
2109                 if (op_data->op_mea1 != NULL) {
2110                         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2111
2112                         src_tgt = lmv_locate_target_for_name(lmv, lsm, old,
2113                                                              oldlen,
2114                                                              &op_data->op_fid1,
2115                                                              &op_data->op_mds);
2116                         if (IS_ERR(src_tgt))
2117                                 RETURN(PTR_ERR(src_tgt));
2118                 } else {
2119                         src_tgt = lmv_find_target(lmv, &op_data->op_fid1);
2120                         if (IS_ERR(src_tgt))
2121                                 RETURN(PTR_ERR(src_tgt));
2122
2123                         op_data->op_mds = src_tgt->ltd_idx;
2124                 }
2125
2126                 if (op_data->op_mea2) {
2127                         struct lmv_stripe_md    *lsm = op_data->op_mea2;
2128                         const struct lmv_oinfo  *oinfo;
2129
2130                         oinfo = lsm_name_to_stripe_info(lsm, new, newlen);
2131                         if (IS_ERR(oinfo))
2132                                 RETURN(PTR_ERR(oinfo));
2133
2134                         op_data->op_fid2 = oinfo->lmo_fid;
2135                 }
2136         }
2137         if (IS_ERR(src_tgt))
2138                 RETURN(PTR_ERR(src_tgt));
2139
2140         /*
2141          * LOOKUP lock on src child (fid3) should also be cancelled for
2142          * src_tgt in mdc_rename.
2143          */
2144         op_data->op_flags |= MF_MDC_CANCEL_FID1 | MF_MDC_CANCEL_FID3;
2145
2146         /*
2147          * Cancel UPDATE locks on tgt parent (fid2), tgt_tgt is its
2148          * own target.
2149          */
2150         rc = lmv_early_cancel(exp, NULL, op_data, src_tgt->ltd_idx,
2151                               LCK_EX, MDS_INODELOCK_UPDATE,
2152                               MF_MDC_CANCEL_FID2);
2153
2154         if (rc != 0)
2155                 RETURN(rc);
2156         /*
2157          * Cancel LOOKUP locks on source child (fid3) for parent tgt_tgt.
2158          */
2159         if (fid_is_sane(&op_data->op_fid3)) {
2160                 struct lmv_tgt_desc *tgt;
2161
2162                 tgt = lmv_find_target(lmv, &op_data->op_fid1);
2163                 if (IS_ERR(tgt))
2164                         RETURN(PTR_ERR(tgt));
2165
2166                 /* Cancel LOOKUP lock on its parent */
2167                 rc = lmv_early_cancel(exp, tgt, op_data, src_tgt->ltd_idx,
2168                                       LCK_EX, MDS_INODELOCK_LOOKUP,
2169                                       MF_MDC_CANCEL_FID3);
2170                 if (rc != 0)
2171                         RETURN(rc);
2172
2173                 rc = lmv_early_cancel(exp, NULL, op_data, src_tgt->ltd_idx,
2174                                       LCK_EX, MDS_INODELOCK_FULL,
2175                                       MF_MDC_CANCEL_FID3);
2176                 if (rc != 0)
2177                         RETURN(rc);
2178         }
2179
2180         /*
2181          * Cancel all the locks on tgt child (fid4).
2182          */
2183         if (fid_is_sane(&op_data->op_fid4))
2184                 rc = lmv_early_cancel(exp, NULL, op_data, src_tgt->ltd_idx,
2185                                       LCK_EX, MDS_INODELOCK_FULL,
2186                                       MF_MDC_CANCEL_FID4);
2187
2188         CDEBUG(D_INODE, DFID":m%d to "DFID"\n", PFID(&op_data->op_fid1),
2189                op_data->op_mds, PFID(&op_data->op_fid2));
2190
2191         rc = md_rename(src_tgt->ltd_exp, op_data, old, oldlen, new, newlen,
2192                        request);
2193
2194         RETURN(rc);
2195 }
2196
2197 static int lmv_setattr(struct obd_export *exp, struct md_op_data *op_data,
2198                        void *ea, int ealen, void *ea2, int ea2len,
2199                        struct ptlrpc_request **request,
2200                        struct md_open_data **mod)
2201 {
2202         struct obd_device       *obd = exp->exp_obd;
2203         struct lmv_obd          *lmv = &obd->u.lmv;
2204         struct lmv_tgt_desc     *tgt;
2205         int                      rc = 0;
2206         ENTRY;
2207
2208         rc = lmv_check_connect(obd);
2209         if (rc)
2210                 RETURN(rc);
2211
2212         CDEBUG(D_INODE, "SETATTR for "DFID", valid 0x%x\n",
2213                PFID(&op_data->op_fid1), op_data->op_attr.ia_valid);
2214
2215         op_data->op_flags |= MF_MDC_CANCEL_FID1;
2216         tgt = lmv_find_target(lmv, &op_data->op_fid1);
2217         if (IS_ERR(tgt))
2218                 RETURN(PTR_ERR(tgt));
2219
2220         rc = md_setattr(tgt->ltd_exp, op_data, ea, ealen, ea2,
2221                         ea2len, request, mod);
2222
2223         RETURN(rc);
2224 }
2225
2226 static int lmv_fsync(struct obd_export *exp, const struct lu_fid *fid,
2227                      struct obd_capa *oc, struct ptlrpc_request **request)
2228 {
2229         struct obd_device       *obd = exp->exp_obd;
2230         struct lmv_obd          *lmv = &obd->u.lmv;
2231         struct lmv_tgt_desc     *tgt;
2232         int                      rc;
2233         ENTRY;
2234
2235         rc = lmv_check_connect(obd);
2236         if (rc != 0)
2237                 RETURN(rc);
2238
2239         tgt = lmv_find_target(lmv, fid);
2240         if (IS_ERR(tgt))
2241                 RETURN(PTR_ERR(tgt));
2242
2243         rc = md_fsync(tgt->ltd_exp, fid, oc, request);
2244         RETURN(rc);
2245 }
2246
2247 /*
2248  * Adjust a set of pages, each page containing an array of lu_dirpages,
2249  * so that each page can be used as a single logical lu_dirpage.
2250  *
2251  * A lu_dirpage is laid out as follows, where s = ldp_hash_start,
2252  * e = ldp_hash_end, f = ldp_flags, p = padding, and each "ent" is a
2253  * struct lu_dirent.  It has size up to LU_PAGE_SIZE. The ldp_hash_end
2254  * value is used as a cookie to request the next lu_dirpage in a
2255  * directory listing that spans multiple pages (two in this example):
2256  *   ________
2257  *  |        |
2258  * .|--------v-------   -----.
2259  * |s|e|f|p|ent|ent| ... |ent|
2260  * '--|--------------   -----'   Each CFS_PAGE contains a single
2261  *    '------.                   lu_dirpage.
2262  * .---------v-------   -----.
2263  * |s|e|f|p|ent| 0 | ... | 0 |
2264  * '-----------------   -----'
2265  *
2266  * However, on hosts where the native VM page size (PAGE_CACHE_SIZE) is
2267  * larger than LU_PAGE_SIZE, a single host page may contain multiple
2268  * lu_dirpages. After reading the lu_dirpages from the MDS, the
2269  * ldp_hash_end of the first lu_dirpage refers to the one immediately
2270  * after it in the same CFS_PAGE (arrows simplified for brevity, but
2271  * in general e0==s1, e1==s2, etc.):
2272  *
2273  * .--------------------   -----.
2274  * |s0|e0|f0|p|ent|ent| ... |ent|
2275  * |---v----------------   -----|
2276  * |s1|e1|f1|p|ent|ent| ... |ent|
2277  * |---v----------------   -----|  Here, each CFS_PAGE contains
2278  *             ...                 multiple lu_dirpages.
2279  * |---v----------------   -----|
2280  * |s'|e'|f'|p|ent|ent| ... |ent|
2281  * '---|----------------   -----'
2282  *     v
2283  * .----------------------------.
2284  * |        next CFS_PAGE       |
2285  *
2286  * This structure is transformed into a single logical lu_dirpage as follows:
2287  *
2288  * - Replace e0 with e' so the request for the next lu_dirpage gets the page
2289  *   labeled 'next CFS_PAGE'.
2290  *
2291  * - Copy the LDF_COLLIDE flag from f' to f0 to correctly reflect whether
2292  *   a hash collision with the next page exists.
2293  *
2294  * - Adjust the lde_reclen of the ending entry of each lu_dirpage to span
2295  *   to the first entry of the next lu_dirpage.
2296  */
2297 #if PAGE_CACHE_SIZE > LU_PAGE_SIZE
2298 static void lmv_adjust_dirpages(struct page **pages, int ncfspgs, int nlupgs)
2299 {
2300         int i;
2301
2302         for (i = 0; i < ncfspgs; i++) {
2303                 struct lu_dirpage       *dp = kmap(pages[i]);
2304                 struct lu_dirpage       *first = dp;
2305                 struct lu_dirent        *end_dirent = NULL;
2306                 struct lu_dirent        *ent;
2307                 __u64                   hash_end = dp->ldp_hash_end;
2308                 __u32                   flags = dp->ldp_flags;
2309
2310                 while (--nlupgs > 0) {
2311                         ent = lu_dirent_start(dp);
2312                         for (end_dirent = ent; ent != NULL;
2313                              end_dirent = ent, ent = lu_dirent_next(ent));
2314
2315                         /* Advance dp to next lu_dirpage. */
2316                         dp = (struct lu_dirpage *)((char *)dp + LU_PAGE_SIZE);
2317
2318                         /* Check if we've reached the end of the CFS_PAGE. */
2319                         if (!((unsigned long)dp & ~CFS_PAGE_MASK))
2320                                 break;
2321
2322                         /* Save the hash and flags of this lu_dirpage. */
2323                         hash_end = dp->ldp_hash_end;
2324                         flags = dp->ldp_flags;
2325
2326                         /* Check if lu_dirpage contains no entries. */
2327                         if (!end_dirent)
2328                                 break;
2329
2330                         /* Enlarge the end entry lde_reclen from 0 to
2331                          * first entry of next lu_dirpage. */
2332                         LASSERT(le16_to_cpu(end_dirent->lde_reclen) == 0);
2333                         end_dirent->lde_reclen =
2334                                 cpu_to_le16((char *)(dp->ldp_entries) -
2335                                             (char *)end_dirent);
2336                 }
2337
2338                 first->ldp_hash_end = hash_end;
2339                 first->ldp_flags &= ~cpu_to_le32(LDF_COLLIDE);
2340                 first->ldp_flags |= flags & cpu_to_le32(LDF_COLLIDE);
2341
2342                 kunmap(pages[i]);
2343         }
2344         LASSERTF(nlupgs == 0, "left = %d", nlupgs);
2345 }
2346 #else
2347 #define lmv_adjust_dirpages(pages, ncfspgs, nlupgs) do {} while (0)
2348 #endif  /* PAGE_CACHE_SIZE > LU_PAGE_SIZE */
2349
2350 /**
2351  * Get current minimum entry from striped directory
2352  *
2353  * This function will search the dir entry, whose hash value is the
2354  * closest(>=) to @hash_offset, from all of sub-stripes, and it is
2355  * only being called for striped directory.
2356  *
2357  * \param[in] exp               export of LMV
2358  * \param[in] op_data           parameters transferred beween client MD stack
2359  *                              stripe_information will be included in this
2360  *                              parameter
2361  * \param[in] cb_op             ldlm callback being used in enqueue in
2362  *                              mdc_read_page
2363  * \param[in] hash_offset       the hash value, which is used to locate
2364  *                              minum(closet) dir entry
2365  * \param[in|out] stripe_offset the caller use this to indicate the stripe
2366  *                              index of last entry, so to avoid hash conflict
2367  *                              between stripes. It will also be used to
2368  *                              return the stripe index of current dir entry.
2369  * \param[in|out] entp          the minum entry and it also is being used
2370  *                              to input the last dir entry to resolve the
2371  *                              hash conflict
2372  *
2373  * \param[out] ppage            the page which holds the minum entry
2374  *
2375  * \retval                      = 0 get the entry successfully
2376  *                              negative errno (< 0) does not get the entry
2377  */
2378 static int lmv_get_min_striped_entry(struct obd_export *exp,
2379                                      struct md_op_data *op_data,
2380                                      struct md_callback *cb_op,
2381                                      __u64 hash_offset, int *stripe_offset,
2382                                      struct lu_dirent **entp,
2383                                      struct page **ppage)
2384 {
2385         struct obd_device       *obd = exp->exp_obd;
2386         struct lmv_obd          *lmv = &obd->u.lmv;
2387         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2388         struct lmv_tgt_desc     *tgt;
2389         int                     stripe_count;
2390         struct lu_dirent        *min_ent = NULL;
2391         struct page             *min_page = NULL;
2392         int                     min_idx = 0;
2393         int                     i;
2394         int                     rc = 0;
2395         ENTRY;
2396
2397         stripe_count = lsm->lsm_md_stripe_count;
2398         for (i = 0; i < stripe_count; i++) {
2399                 struct lu_dirent        *ent = NULL;
2400                 struct page             *page = NULL;
2401                 struct lu_dirpage       *dp;
2402                 __u64                   stripe_hash = hash_offset;
2403
2404                 tgt = lmv_get_target(lmv, lsm->lsm_md_oinfo[i].lmo_mds, NULL);
2405                 if (IS_ERR(tgt))
2406                         GOTO(out, rc = PTR_ERR(tgt));
2407
2408                 /* op_data will be shared by each stripe, so we need
2409                  * reset these value for each stripe */
2410                 op_data->op_stripe_offset = i;
2411                 op_data->op_fid1 = lsm->lsm_md_oinfo[i].lmo_fid;
2412                 op_data->op_fid2 = lsm->lsm_md_oinfo[i].lmo_fid;
2413                 op_data->op_data = lsm->lsm_md_oinfo[i].lmo_root;
2414 next:
2415                 rc = md_read_page(tgt->ltd_exp, op_data, cb_op, stripe_hash,
2416                                   &page);
2417                 if (rc != 0)
2418                         GOTO(out, rc);
2419
2420                 dp = page_address(page);
2421                 for (ent = lu_dirent_start(dp); ent != NULL;
2422                      ent = lu_dirent_next(ent)) {
2423                         /* Skip dummy entry */
2424                         if (le16_to_cpu(ent->lde_namelen) == 0)
2425                                 continue;
2426
2427                         if (le64_to_cpu(ent->lde_hash) < hash_offset)
2428                                 continue;
2429
2430                         if (le64_to_cpu(ent->lde_hash) == hash_offset &&
2431                             (*entp == ent || i < *stripe_offset))
2432                                 continue;
2433
2434                         /* skip . and .. for other stripes */
2435                         if (i != 0 &&
2436                             (strncmp(ent->lde_name, ".",
2437                                      le16_to_cpu(ent->lde_namelen)) == 0 ||
2438                              strncmp(ent->lde_name, "..",
2439                                      le16_to_cpu(ent->lde_namelen)) == 0))
2440                                 continue;
2441                         break;
2442                 }
2443
2444                 if (ent == NULL) {
2445                         stripe_hash = le64_to_cpu(dp->ldp_hash_end);
2446
2447                         kunmap(page);
2448                         page_cache_release(page);
2449                         page = NULL;
2450
2451                         /* reach the end of current stripe, go to next stripe */
2452                         if (stripe_hash == MDS_DIR_END_OFF)
2453                                 continue;
2454                         else
2455                                 goto next;
2456                 }
2457
2458                 if (min_ent != NULL) {
2459                         if (le64_to_cpu(min_ent->lde_hash) >
2460                             le64_to_cpu(ent->lde_hash)) {
2461                                 min_ent = ent;
2462                                 kunmap(min_page);
2463                                 page_cache_release(min_page);
2464                                 min_idx = i;
2465                                 min_page = page;
2466                         } else {
2467                                 kunmap(page);
2468                                 page_cache_release(page);
2469                                 page = NULL;
2470                         }
2471                 } else {
2472                         min_ent = ent;
2473                         min_page = page;
2474                         min_idx = i;
2475                 }
2476         }
2477
2478 out:
2479         if (*ppage != NULL) {
2480                 kunmap(*ppage);
2481                 page_cache_release(*ppage);
2482         }
2483         *stripe_offset = min_idx;
2484         *entp = min_ent;
2485         *ppage = min_page;
2486         RETURN(rc);
2487 }
2488
2489 /**
2490  * Build dir entry page from a striped directory
2491  *
2492  * This function gets one entry by @offset from a striped directory. It will
2493  * read entries from all of stripes, and choose one closest to the required
2494  * offset(&offset). A few notes
2495  * 1. skip . and .. for non-zero stripes, because there can only have one .
2496  * and .. in a directory.
2497  * 2. op_data will be shared by all of stripes, instead of allocating new
2498  * one, so need to restore before reusing.
2499  * 3. release the entry page if that is not being chosen.
2500  *
2501  * \param[in] exp       obd export refer to LMV
2502  * \param[in] op_data   hold those MD parameters of read_entry
2503  * \param[in] cb_op     ldlm callback being used in enqueue in mdc_read_entry
2504  * \param[out] ldp      the entry being read
2505  * \param[out] ppage    the page holding the entry. Note: because the entry
2506  *                      will be accessed in upper layer, so we need hold the
2507  *                      page until the usages of entry is finished, see
2508  *                      ll_dir_entry_next.
2509  *
2510  * retval               =0 if get entry successfully
2511  *                      <0 cannot get entry
2512  */
2513 static int lmv_read_striped_page(struct obd_export *exp,
2514                                  struct md_op_data *op_data,
2515                                  struct md_callback *cb_op,
2516                                  __u64 offset, struct page **ppage)
2517 {
2518         struct obd_device       *obd = exp->exp_obd;
2519         struct lu_fid           master_fid = op_data->op_fid1;
2520         struct inode            *master_inode = op_data->op_data;
2521         __u64                   hash_offset = offset;
2522         struct lu_dirpage       *dp;
2523         struct page             *min_ent_page = NULL;
2524         struct page             *ent_page = NULL;
2525         struct lu_dirent        *ent;
2526         void                    *area;
2527         int                     ent_idx = 0;
2528         struct lu_dirent        *min_ent = NULL;
2529         struct lu_dirent        *last_ent;
2530         int                     left_bytes;
2531         int                     rc;
2532         ENTRY;
2533
2534         rc = lmv_check_connect(obd);
2535         if (rc)
2536                 RETURN(rc);
2537
2538         /* Allocate a page and read entries from all of stripes and fill
2539          * the page by hash order */
2540         ent_page = alloc_page(GFP_KERNEL);
2541         if (ent_page == NULL)
2542                 RETURN(-ENOMEM);
2543
2544         /* Initialize the entry page */
2545         dp = kmap(ent_page);
2546         memset(dp, 0, sizeof(*dp));
2547         dp->ldp_hash_start = cpu_to_le64(offset);
2548         dp->ldp_flags |= LDF_COLLIDE;
2549
2550         area = dp + 1;
2551         left_bytes = PAGE_CACHE_SIZE - sizeof(*dp);
2552         ent = area;
2553         last_ent = ent;
2554         do {
2555                 __u16   ent_size;
2556
2557                 /* Find the minum entry from all sub-stripes */
2558                 rc = lmv_get_min_striped_entry(exp, op_data, cb_op, hash_offset,
2559                                                &ent_idx, &min_ent,
2560                                                &min_ent_page);
2561                 if (rc != 0)
2562                         GOTO(out, rc);
2563
2564                 /* If it can not get minum entry, it means it already reaches
2565                  * the end of this directory */
2566                 if (min_ent == NULL) {
2567                         last_ent->lde_reclen = 0;
2568                         hash_offset = MDS_DIR_END_OFF;
2569                         GOTO(out, rc);
2570                 }
2571
2572                 ent_size = le16_to_cpu(min_ent->lde_reclen);
2573
2574                 /* the last entry lde_reclen is 0, but it might not
2575                  * the end of this entry of this temporay entry */
2576                 if (ent_size == 0)
2577                         ent_size = lu_dirent_calc_size(
2578                                         le16_to_cpu(min_ent->lde_namelen),
2579                                         le32_to_cpu(min_ent->lde_attrs));
2580                 if (ent_size > left_bytes) {
2581                         last_ent->lde_reclen = cpu_to_le16(0);
2582                         hash_offset = le64_to_cpu(min_ent->lde_hash);
2583                         GOTO(out, rc);
2584                 }
2585
2586                 memcpy(ent, min_ent, ent_size);
2587
2588                 /* Replace . with master FID and Replace .. with the parent FID
2589                  * of master object */
2590                 if (strncmp(ent->lde_name, ".",
2591                             le16_to_cpu(ent->lde_namelen)) == 0 &&
2592                     le16_to_cpu(ent->lde_namelen) == 1)
2593                         fid_cpu_to_le(&ent->lde_fid, &master_fid);
2594                 else if (strncmp(ent->lde_name, "..",
2595                                    le16_to_cpu(ent->lde_namelen)) == 0 &&
2596                            le16_to_cpu(ent->lde_namelen) == 2)
2597                         fid_cpu_to_le(&ent->lde_fid, &op_data->op_fid3);
2598
2599                 left_bytes -= ent_size;
2600                 ent->lde_reclen = cpu_to_le16(ent_size);
2601                 last_ent = ent;
2602                 ent = (void *)ent + ent_size;
2603                 hash_offset = le64_to_cpu(min_ent->lde_hash);
2604                 if (hash_offset == MDS_DIR_END_OFF) {
2605                         last_ent->lde_reclen = 0;
2606                         break;
2607                 }
2608         } while (1);
2609 out:
2610         if (min_ent_page != NULL) {
2611                 kunmap(min_ent_page);
2612                 page_cache_release(min_ent_page);
2613         }
2614
2615         if (unlikely(rc != 0)) {
2616                 __free_page(ent_page);
2617                 ent_page = NULL;
2618         } else {
2619                 if (ent == area)
2620                         dp->ldp_flags |= LDF_EMPTY;
2621                 dp->ldp_flags = cpu_to_le32(dp->ldp_flags);
2622                 dp->ldp_hash_end = cpu_to_le64(hash_offset);
2623         }
2624
2625         /* We do not want to allocate md_op_data during each
2626          * dir entry reading, so op_data will be shared by every stripe,
2627          * then we need to restore it back to original value before
2628          * return to the upper layer */
2629         op_data->op_fid1 = master_fid;
2630         op_data->op_fid2 = master_fid;
2631         op_data->op_data = master_inode;
2632
2633         *ppage = ent_page;
2634
2635         RETURN(rc);
2636 }
2637
2638 int lmv_read_page(struct obd_export *exp, struct md_op_data *op_data,
2639                   struct md_callback *cb_op, __u64 offset,
2640                   struct page **ppage)
2641 {
2642         struct obd_device       *obd = exp->exp_obd;
2643         struct lmv_obd          *lmv = &obd->u.lmv;
2644         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2645         struct lmv_tgt_desc     *tgt;
2646         int                     rc;
2647         ENTRY;
2648
2649         rc = lmv_check_connect(obd);
2650         if (rc != 0)
2651                 RETURN(rc);
2652
2653         if (unlikely(lsm != NULL)) {
2654                 rc = lmv_read_striped_page(exp, op_data, cb_op, offset, ppage);
2655                 RETURN(rc);
2656         }
2657
2658         tgt = lmv_find_target(lmv, &op_data->op_fid1);
2659         if (IS_ERR(tgt))
2660                 RETURN(PTR_ERR(tgt));
2661
2662         rc = md_read_page(tgt->ltd_exp, op_data, cb_op, offset, ppage);
2663
2664         RETURN(rc);
2665 }
2666
2667 static int lmv_unlink(struct obd_export *exp, struct md_op_data *op_data,
2668                       struct ptlrpc_request **request)
2669 {
2670         struct obd_device       *obd = exp->exp_obd;
2671         struct lmv_obd          *lmv = &obd->u.lmv;
2672         struct lmv_tgt_desc     *tgt = NULL;
2673         struct lmv_tgt_desc     *parent_tgt = NULL;
2674         struct mdt_body         *body;
2675         int                     rc;
2676         ENTRY;
2677
2678         rc = lmv_check_connect(obd);
2679         if (rc)
2680                 RETURN(rc);
2681 retry:
2682         /* Send unlink requests to the MDT where the child is located */
2683         if (likely(!fid_is_zero(&op_data->op_fid2))) {
2684                 tgt = lmv_find_target(lmv, &op_data->op_fid2);
2685                 if (IS_ERR(tgt))
2686                         RETURN(PTR_ERR(tgt));
2687
2688                 /* For striped dir, we need to locate the parent as well */
2689                 if (op_data->op_mea1 != NULL) {
2690                         struct lmv_tgt_desc *tmp;
2691
2692                         LASSERT(op_data->op_name != NULL &&
2693                                 op_data->op_namelen != 0);
2694                         tmp = lmv_locate_target_for_name(lmv,
2695                                                    op_data->op_mea1,
2696                                                    op_data->op_name,
2697                                                    op_data->op_namelen,
2698                                                    &op_data->op_fid1,
2699                                                    &op_data->op_mds);
2700                         if (IS_ERR(tmp))
2701                                 RETURN(PTR_ERR(tmp));
2702                 }
2703         } else {
2704                 tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
2705                 if (IS_ERR(tgt))
2706                         RETURN(PTR_ERR(tgt));
2707         }
2708
2709         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2710         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2711         op_data->op_cap = cfs_curproc_cap_pack();
2712
2713         /*
2714          * If child's fid is given, cancel unused locks for it if it is from
2715          * another export than parent.
2716          *
2717          * LOOKUP lock for child (fid3) should also be cancelled on parent
2718          * tgt_tgt in mdc_unlink().
2719          */
2720         op_data->op_flags |= MF_MDC_CANCEL_FID1 | MF_MDC_CANCEL_FID3;
2721
2722         /*
2723          * Cancel FULL locks on child (fid3).
2724          */
2725         parent_tgt = lmv_find_target(lmv, &op_data->op_fid1);
2726         if (IS_ERR(parent_tgt))
2727                 RETURN(PTR_ERR(parent_tgt));
2728
2729         if (parent_tgt != tgt) {
2730                 rc = lmv_early_cancel(exp, parent_tgt, op_data, tgt->ltd_idx,
2731                                       LCK_EX, MDS_INODELOCK_LOOKUP,
2732                                       MF_MDC_CANCEL_FID3);
2733         }
2734
2735         rc = lmv_early_cancel(exp, NULL, op_data, tgt->ltd_idx, LCK_EX,
2736                               MDS_INODELOCK_FULL, MF_MDC_CANCEL_FID3);
2737         if (rc != 0)
2738                 RETURN(rc);
2739
2740         CDEBUG(D_INODE, "unlink with fid="DFID"/"DFID" -> mds #%d\n",
2741                PFID(&op_data->op_fid1), PFID(&op_data->op_fid2), tgt->ltd_idx);
2742
2743         rc = md_unlink(tgt->ltd_exp, op_data, request);
2744         if (rc != 0 && rc != -EREMOTE)
2745                 RETURN(rc);
2746
2747         body = req_capsule_server_get(&(*request)->rq_pill, &RMF_MDT_BODY);
2748         if (body == NULL)
2749                 RETURN(-EPROTO);
2750
2751         /* Not cross-ref case, just get out of here. */
2752         if (likely(!(body->mbo_valid & OBD_MD_MDS)))
2753                 RETURN(0);
2754
2755         CDEBUG(D_INODE, "%s: try unlink to another MDT for "DFID"\n",
2756                exp->exp_obd->obd_name, PFID(&body->mbo_fid1));
2757
2758         /* This is a remote object, try remote MDT, Note: it may
2759          * try more than 1 time here, Considering following case
2760          * /mnt/lustre is root on MDT0, remote1 is on MDT1
2761          * 1. Initially A does not know where remote1 is, it send
2762          *    unlink RPC to MDT0, MDT0 return -EREMOTE, it will
2763          *    resend unlink RPC to MDT1 (retry 1st time).
2764          *
2765          * 2. During the unlink RPC in flight,
2766          *    client B mv /mnt/lustre/remote1 /mnt/lustre/remote2
2767          *    and create new remote1, but on MDT0
2768          *
2769          * 3. MDT1 get unlink RPC(from A), then do remote lock on
2770          *    /mnt/lustre, then lookup get fid of remote1, and find
2771          *    it is remote dir again, and replay -EREMOTE again.
2772          *
2773          * 4. Then A will resend unlink RPC to MDT0. (retry 2nd times).
2774          *
2775          * In theory, it might try unlimited time here, but it should
2776          * be very rare case.  */
2777         op_data->op_fid2 = body->mbo_fid1;
2778         ptlrpc_req_finished(*request);
2779         *request = NULL;
2780
2781         goto retry;
2782 }
2783
2784 static int lmv_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
2785 {
2786         struct lmv_obd *lmv = &obd->u.lmv;
2787         int rc = 0;
2788
2789         switch (stage) {
2790         case OBD_CLEANUP_EARLY:
2791                 /* XXX: here should be calling obd_precleanup() down to
2792                  * stack. */
2793                 break;
2794         case OBD_CLEANUP_EXPORTS:
2795                 fld_client_proc_fini(&lmv->lmv_fld);
2796                 lprocfs_obd_cleanup(obd);
2797                 lprocfs_free_md_stats(obd);
2798                 break;
2799         default:
2800                 break;
2801         }
2802         RETURN(rc);
2803 }
2804
2805 static int lmv_get_info(const struct lu_env *env, struct obd_export *exp,
2806                         __u32 keylen, void *key, __u32 *vallen, void *val,
2807                         struct lov_stripe_md *lsm)
2808 {
2809         struct obd_device       *obd;
2810         struct lmv_obd          *lmv;
2811         int                      rc = 0;
2812         ENTRY;
2813
2814         obd = class_exp2obd(exp);
2815         if (obd == NULL) {
2816                 CDEBUG(D_IOCTL, "Invalid client cookie "LPX64"\n",
2817                        exp->exp_handle.h_cookie);
2818                 RETURN(-EINVAL);
2819         }
2820
2821         lmv = &obd->u.lmv;
2822         if (keylen >= strlen("remote_flag") && !strcmp(key, "remote_flag")) {
2823                 int i;
2824
2825                 rc = lmv_check_connect(obd);
2826                 if (rc)
2827                         RETURN(rc);
2828
2829                 LASSERT(*vallen == sizeof(__u32));
2830                 for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2831                         struct lmv_tgt_desc *tgt = lmv->tgts[i];
2832                         /*
2833                          * All tgts should be connected when this gets called.
2834                          */
2835                         if (tgt == NULL || tgt->ltd_exp == NULL)
2836                                 continue;
2837
2838                         if (!obd_get_info(env, tgt->ltd_exp, keylen, key,
2839                                           vallen, val, NULL))
2840                                 RETURN(0);
2841                 }
2842                 RETURN(-EINVAL);
2843         } else if (KEY_IS(KEY_MAX_EASIZE) ||
2844                    KEY_IS(KEY_DEFAULT_EASIZE) ||
2845                    KEY_IS(KEY_MAX_COOKIESIZE) ||
2846                    KEY_IS(KEY_DEFAULT_COOKIESIZE) ||
2847                    KEY_IS(KEY_CONN_DATA)) {
2848                 rc = lmv_check_connect(obd);
2849                 if (rc)
2850                         RETURN(rc);
2851
2852                 /*
2853                  * Forwarding this request to first MDS, it should know LOV
2854                  * desc.
2855                  */
2856                 rc = obd_get_info(env, lmv->tgts[0]->ltd_exp, keylen, key,
2857                                   vallen, val, NULL);
2858                 if (!rc && KEY_IS(KEY_CONN_DATA))
2859                         exp->exp_connect_data = *(struct obd_connect_data *)val;
2860                 RETURN(rc);
2861         } else if (KEY_IS(KEY_TGT_COUNT)) {
2862                 *((int *)val) = lmv->desc.ld_tgt_count;
2863                 RETURN(0);
2864         }
2865
2866         CDEBUG(D_IOCTL, "Invalid key\n");
2867         RETURN(-EINVAL);
2868 }
2869
2870 int lmv_set_info_async(const struct lu_env *env, struct obd_export *exp,
2871                        obd_count keylen, void *key, obd_count vallen,
2872                        void *val, struct ptlrpc_request_set *set)
2873 {
2874         struct lmv_tgt_desc    *tgt = NULL;
2875         struct obd_device      *obd;
2876         struct lmv_obd         *lmv;
2877         int rc = 0;
2878         ENTRY;
2879
2880         obd = class_exp2obd(exp);
2881         if (obd == NULL) {
2882                 CDEBUG(D_IOCTL, "Invalid client cookie "LPX64"\n",
2883                        exp->exp_handle.h_cookie);
2884                 RETURN(-EINVAL);
2885         }
2886         lmv = &obd->u.lmv;
2887
2888         if (KEY_IS(KEY_READ_ONLY) || KEY_IS(KEY_FLUSH_CTX)) {
2889                 int i, err = 0;
2890
2891                 for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2892                         tgt = lmv->tgts[i];
2893
2894                         if (tgt == NULL || tgt->ltd_exp == NULL)
2895                                 continue;
2896
2897                         err = obd_set_info_async(env, tgt->ltd_exp,
2898                                                  keylen, key, vallen, val, set);
2899                         if (err && rc == 0)
2900                                 rc = err;
2901                 }
2902
2903                 RETURN(rc);
2904         }
2905
2906         RETURN(-EINVAL);
2907 }
2908
2909 static int lmv_pack_md_v1(const struct lmv_stripe_md *lsm,
2910                           struct lmv_mds_md_v1 *lmm1)
2911 {
2912         int     cplen;
2913         int     i;
2914
2915         lmm1->lmv_magic = cpu_to_le32(lsm->lsm_md_magic);
2916         lmm1->lmv_stripe_count = cpu_to_le32(lsm->lsm_md_stripe_count);
2917         lmm1->lmv_master_mdt_index = cpu_to_le32(lsm->lsm_md_master_mdt_index);
2918         lmm1->lmv_hash_type = cpu_to_le32(lsm->lsm_md_hash_type);
2919         cplen = strlcpy(lmm1->lmv_pool_name, lsm->lsm_md_pool_name,
2920                         sizeof(lmm1->lmv_pool_name));
2921         if (cplen >= sizeof(lmm1->lmv_pool_name))
2922                 return -E2BIG;
2923
2924         for (i = 0; i < lsm->lsm_md_stripe_count; i++)
2925                 fid_cpu_to_le(&lmm1->lmv_stripe_fids[i],
2926                               &lsm->lsm_md_oinfo[i].lmo_fid);
2927         return 0;
2928 }
2929
2930 int lmv_pack_md(union lmv_mds_md **lmmp, const struct lmv_stripe_md *lsm,
2931                 int stripe_count)
2932 {
2933         int     lmm_size = 0;
2934         bool    allocated = false;
2935         int     rc = 0;
2936         ENTRY;
2937
2938         LASSERT(lmmp != NULL);
2939         /* Free lmm */
2940         if (*lmmp != NULL && lsm == NULL) {
2941                 int stripe_count;
2942
2943                 stripe_count = lmv_mds_md_stripe_count_get(*lmmp);
2944                 lmm_size = lmv_mds_md_size(stripe_count,
2945                                            le32_to_cpu((*lmmp)->lmv_magic));
2946                 if (lmm_size == 0)
2947                         RETURN(-EINVAL);
2948                 OBD_FREE(*lmmp, lmm_size);
2949                 *lmmp = NULL;
2950                 RETURN(0);
2951         }
2952
2953         /* Alloc lmm */
2954         if (*lmmp == NULL && lsm == NULL) {
2955                 lmm_size = lmv_mds_md_size(stripe_count, LMV_MAGIC);
2956                 LASSERT(lmm_size > 0);
2957                 OBD_ALLOC(*lmmp, lmm_size);
2958                 if (*lmmp == NULL)
2959                         RETURN(-ENOMEM);
2960                 lmv_mds_md_stripe_count_set(*lmmp, stripe_count);
2961                 (*lmmp)->lmv_magic = cpu_to_le32(LMV_MAGIC);
2962                 RETURN(lmm_size);
2963         }
2964
2965         /* pack lmm */
2966         LASSERT(lsm != NULL);
2967         lmm_size = lmv_mds_md_size(lsm->lsm_md_stripe_count, lsm->lsm_md_magic);
2968         if (*lmmp == NULL) {
2969                 OBD_ALLOC(*lmmp, lmm_size);
2970                 if (*lmmp == NULL)
2971                         RETURN(-ENOMEM);
2972                 allocated = true;
2973         }
2974
2975         switch (lsm->lsm_md_magic) {
2976         case LMV_MAGIC_V1:
2977                 rc = lmv_pack_md_v1(lsm, &(*lmmp)->lmv_md_v1);
2978                 break;
2979         default:
2980                 rc = -EINVAL;
2981                 break;
2982         }
2983
2984         if (rc != 0 && allocated) {
2985                 OBD_FREE(*lmmp, lmm_size);
2986                 *lmmp = NULL;
2987         }
2988
2989         RETURN(lmm_size);
2990 }
2991 EXPORT_SYMBOL(lmv_pack_md);
2992
2993 static int lmv_unpack_md_v1(struct obd_export *exp, struct lmv_stripe_md *lsm,
2994                             const struct lmv_mds_md_v1 *lmm1)
2995 {
2996         struct lmv_obd  *lmv = &exp->exp_obd->u.lmv;
2997         int             stripe_count;
2998         int             cplen;
2999         int             i;
3000         int             rc = 0;
3001         ENTRY;
3002
3003         lsm->lsm_md_magic = le32_to_cpu(lmm1->lmv_magic);
3004         lsm->lsm_md_stripe_count = le32_to_cpu(lmm1->lmv_stripe_count);
3005         lsm->lsm_md_master_mdt_index = le32_to_cpu(lmm1->lmv_master_mdt_index);
3006         lsm->lsm_md_hash_type = le32_to_cpu(lmm1->lmv_hash_type);
3007         lsm->lsm_md_layout_version = le32_to_cpu(lmm1->lmv_layout_version);
3008         fid_le_to_cpu(&lsm->lsm_md_master_fid, &lmm1->lmv_master_fid);
3009         cplen = strlcpy(lsm->lsm_md_pool_name, lmm1->lmv_pool_name,
3010                         sizeof(lsm->lsm_md_pool_name));
3011
3012         if (!fid_is_sane(&lsm->lsm_md_master_fid))
3013                 RETURN(-EPROTO);
3014
3015         if (cplen >= sizeof(lsm->lsm_md_pool_name))
3016                 RETURN(-E2BIG);
3017
3018         CDEBUG(D_INFO, "unpack lsm count %d, master %d hash_type %d"
3019                "layout_version %d\n", lsm->lsm_md_stripe_count,
3020                lsm->lsm_md_master_mdt_index, lsm->lsm_md_hash_type,
3021                lsm->lsm_md_layout_version);
3022
3023         stripe_count = le32_to_cpu(lmm1->lmv_stripe_count);
3024         for (i = 0; i < le32_to_cpu(stripe_count); i++) {
3025                 fid_le_to_cpu(&lsm->lsm_md_oinfo[i].lmo_fid,
3026                               &lmm1->lmv_stripe_fids[i]);
3027                 rc = lmv_fld_lookup(lmv, &lsm->lsm_md_oinfo[i].lmo_fid,
3028                                     &lsm->lsm_md_oinfo[i].lmo_mds);
3029                 if (rc != 0)
3030                         RETURN(rc);
3031                 CDEBUG(D_INFO, "unpack fid #%d "DFID"\n", i,
3032                        PFID(&lsm->lsm_md_oinfo[i].lmo_fid));
3033         }
3034
3035         RETURN(rc);
3036 }
3037
3038 int lmv_unpack_md(struct obd_export *exp, struct lmv_stripe_md **lsmp,
3039                   const union lmv_mds_md *lmm, int stripe_count)
3040 {
3041         struct lmv_stripe_md     *lsm;
3042         int                      lsm_size;
3043         int                      rc;
3044         bool                     allocated = false;
3045         ENTRY;
3046
3047         LASSERT(lsmp != NULL);
3048
3049         lsm = *lsmp;
3050         /* Free memmd */
3051         if (lsm != NULL && lmm == NULL) {
3052 #ifdef __KERNEL__
3053                 int i;
3054                 for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
3055                         /* For migrating inode, the master stripe and master
3056                          * object will be the same, so do not need iput, see
3057                          * ll_update_lsm_md */
3058                         if (!(lsm->lsm_md_hash_type & LMV_HASH_FLAG_MIGRATION &&
3059                               i == 0) && lsm->lsm_md_oinfo[i].lmo_root != NULL)
3060                                 iput(lsm->lsm_md_oinfo[i].lmo_root);
3061                 }
3062 #endif
3063                 lsm_size = lmv_stripe_md_size(lsm->lsm_md_stripe_count);
3064                 OBD_FREE(lsm, lsm_size);
3065                 *lsmp = NULL;
3066                 RETURN(0);
3067         }
3068
3069         /* Alloc memmd */
3070         if (lsm == NULL && lmm == NULL) {
3071                 lsm_size = lmv_stripe_md_size(stripe_count);
3072                 OBD_ALLOC(lsm, lsm_size);
3073                 if (lsm == NULL)
3074                         RETURN(-ENOMEM);
3075                 lsm->lsm_md_stripe_count = stripe_count;
3076                 *lsmp = lsm;
3077                 RETURN(0);
3078         }
3079
3080         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_STRIPE)
3081                 RETURN(-EPERM);
3082
3083         /* Unpack memmd */
3084         if (le32_to_cpu(lmm->lmv_magic) != LMV_MAGIC_V1 &&
3085             le32_to_cpu(lmm->lmv_magic) != LMV_USER_MAGIC) {
3086                 CERROR("%s: invalid lmv magic %x: rc = %d\n",
3087                        exp->exp_obd->obd_name, le32_to_cpu(lmm->lmv_magic),
3088                        -EIO);
3089                 RETURN(-EIO);
3090         }
3091
3092         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_V1)
3093                 lsm_size = lmv_stripe_md_size(lmv_mds_md_stripe_count_get(lmm));
3094         else
3095                 /**
3096                  * Unpack default dirstripe(lmv_user_md) to lmv_stripe_md,
3097                  * stripecount should be 0 then.
3098                  */
3099                 lsm_size = lmv_stripe_md_size(0);
3100
3101         lsm_size = lmv_stripe_md_size(lmv_mds_md_stripe_count_get(lmm));
3102         if (lsm == NULL) {
3103                 OBD_ALLOC(lsm, lsm_size);
3104                 if (lsm == NULL)
3105                         RETURN(-ENOMEM);
3106                 allocated = true;
3107                 *lsmp = lsm;
3108         }
3109
3110         switch (le32_to_cpu(lmm->lmv_magic)) {
3111         case LMV_MAGIC_V1:
3112                 rc = lmv_unpack_md_v1(exp, lsm, &lmm->lmv_md_v1);
3113                 break;
3114         default:
3115                 CERROR("%s: unrecognized magic %x\n", exp->exp_obd->obd_name,
3116                        le32_to_cpu(lmm->lmv_magic));
3117                 rc = -EINVAL;
3118                 break;
3119         }
3120
3121         if (rc != 0 && allocated) {
3122                 OBD_FREE(lsm, lsm_size);
3123                 *lsmp = NULL;
3124                 lsm_size = rc;
3125         }
3126         RETURN(lsm_size);
3127 }
3128
3129 int lmv_alloc_memmd(struct lmv_stripe_md **lsmp, int stripes)
3130 {
3131         return lmv_unpack_md(NULL, lsmp, NULL, stripes);
3132 }
3133 EXPORT_SYMBOL(lmv_alloc_memmd);
3134
3135 void lmv_free_memmd(struct lmv_stripe_md *lsm)
3136 {
3137         lmv_unpack_md(NULL, &lsm, NULL, 0);
3138 }
3139 EXPORT_SYMBOL(lmv_free_memmd);
3140
3141 int lmv_unpackmd(struct obd_export *exp, struct lov_stripe_md **lsmp,
3142                  struct lov_mds_md *lmm, int disk_len)
3143 {
3144         return lmv_unpack_md(exp, (struct lmv_stripe_md **)lsmp,
3145                              (union lmv_mds_md *)lmm, disk_len);
3146 }
3147
3148 int lmv_packmd(struct obd_export *exp, struct lov_mds_md **lmmp,
3149                struct lov_stripe_md *lsm)
3150 {
3151         struct obd_device               *obd = exp->exp_obd;
3152         struct lmv_obd                  *lmv_obd = &obd->u.lmv;
3153         const struct lmv_stripe_md      *lmv = (struct lmv_stripe_md *)lsm;
3154         int                             stripe_count;
3155
3156         if (lmmp == NULL) {
3157                 if (lsm != NULL)
3158                         stripe_count = lmv->lsm_md_stripe_count;
3159                 else
3160                         stripe_count = lmv_obd->desc.ld_tgt_count;
3161
3162                 return lmv_mds_md_size(stripe_count, LMV_MAGIC_V1);
3163         }
3164
3165         return lmv_pack_md((union lmv_mds_md **)lmmp, lmv, 0);
3166 }
3167
3168 static int lmv_cancel_unused(struct obd_export *exp, const struct lu_fid *fid,
3169                              ldlm_policy_data_t *policy, ldlm_mode_t mode,
3170                              ldlm_cancel_flags_t flags, void *opaque)
3171 {
3172         struct obd_device       *obd = exp->exp_obd;
3173         struct lmv_obd          *lmv = &obd->u.lmv;
3174         int                      rc = 0;
3175         int                      err;
3176         __u32                    i;
3177         ENTRY;
3178
3179         LASSERT(fid != NULL);
3180
3181         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
3182                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
3183
3184                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active)
3185                         continue;
3186
3187                 err = md_cancel_unused(tgt->ltd_exp, fid, policy, mode, flags,
3188                                        opaque);
3189                 if (!rc)
3190                         rc = err;
3191         }
3192         RETURN(rc);
3193 }
3194
3195 int lmv_set_lock_data(struct obd_export *exp, __u64 *lockh, void *data,
3196                       __u64 *bits)
3197 {
3198         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
3199         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
3200         int                      rc;
3201         ENTRY;
3202
3203         if (tgt == NULL || tgt->ltd_exp == NULL)
3204                 RETURN(-EINVAL);
3205         rc =  md_set_lock_data(tgt->ltd_exp, lockh, data, bits);
3206         RETURN(rc);
3207 }
3208
3209 ldlm_mode_t lmv_lock_match(struct obd_export *exp, __u64 flags,
3210                            const struct lu_fid *fid, ldlm_type_t type,
3211                            ldlm_policy_data_t *policy, ldlm_mode_t mode,
3212                            struct lustre_handle *lockh)
3213 {
3214         struct obd_device       *obd = exp->exp_obd;
3215         struct lmv_obd          *lmv = &obd->u.lmv;
3216         ldlm_mode_t             rc;
3217         int                     tgt;
3218         int                     i;
3219         ENTRY;
3220
3221         CDEBUG(D_INODE, "Lock match for "DFID"\n", PFID(fid));
3222
3223         /*
3224          * With DNE every object can have two locks in different namespaces:
3225          * lookup lock in space of MDT storing direntry and update/open lock in
3226          * space of MDT storing inode.  Try the MDT that the FID maps to first,
3227          * since this can be easily found, and only try others if that fails.
3228          */
3229         for (i = 0, tgt = lmv_find_target_index(lmv, fid);
3230              i < lmv->desc.ld_tgt_count;
3231              i++, tgt = (tgt + 1) % lmv->desc.ld_tgt_count) {
3232                 if (tgt < 0) {
3233                         CDEBUG(D_HA, "%s: "DFID" is inaccessible: rc = %d\n",
3234                                obd->obd_name, PFID(fid), tgt);
3235                         tgt = 0;
3236                 }
3237
3238                 if (lmv->tgts[tgt] == NULL ||
3239                     lmv->tgts[tgt]->ltd_exp == NULL ||
3240                     lmv->tgts[tgt]->ltd_active == 0)
3241                         continue;
3242
3243                 rc = md_lock_match(lmv->tgts[tgt]->ltd_exp, flags, fid,
3244                                    type, policy, mode, lockh);
3245                 if (rc)
3246                         RETURN(rc);
3247         }
3248
3249         RETURN(0);
3250 }
3251
3252 int lmv_get_lustre_md(struct obd_export *exp, struct ptlrpc_request *req,
3253                       struct obd_export *dt_exp, struct obd_export *md_exp,
3254                       struct lustre_md *md)
3255 {
3256         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
3257         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
3258
3259         if (tgt == NULL || tgt->ltd_exp == NULL)
3260                 RETURN(-EINVAL);
3261
3262         return md_get_lustre_md(lmv->tgts[0]->ltd_exp, req, dt_exp, md_exp, md);
3263 }
3264
3265 int lmv_free_lustre_md(struct obd_export *exp, struct lustre_md *md)
3266 {
3267         struct obd_device       *obd = exp->exp_obd;
3268         struct lmv_obd          *lmv = &obd->u.lmv;
3269         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
3270         ENTRY;
3271
3272         if (md->lmv != NULL) {
3273                 lmv_free_memmd(md->lmv);
3274                 md->lmv = NULL;
3275         }
3276         if (tgt == NULL || tgt->ltd_exp == NULL)
3277                 RETURN(-EINVAL);
3278         RETURN(md_free_lustre_md(lmv->tgts[0]->ltd_exp, md));
3279 }
3280
3281 int lmv_set_open_replay_data(struct obd_export *exp,
3282                              struct obd_client_handle *och,
3283                              struct lookup_intent *it)
3284 {
3285         struct obd_device       *obd = exp->exp_obd;
3286         struct lmv_obd          *lmv = &obd->u.lmv;
3287         struct lmv_tgt_desc     *tgt;
3288         ENTRY;
3289
3290         tgt = lmv_find_target(lmv, &och->och_fid);
3291         if (IS_ERR(tgt))
3292                 RETURN(PTR_ERR(tgt));
3293
3294         RETURN(md_set_open_replay_data(tgt->ltd_exp, och, it));
3295 }
3296
3297 int lmv_clear_open_replay_data(struct obd_export *exp,
3298                                struct obd_client_handle *och)
3299 {
3300         struct obd_device       *obd = exp->exp_obd;
3301         struct lmv_obd          *lmv = &obd->u.lmv;
3302         struct lmv_tgt_desc     *tgt;
3303         ENTRY;
3304
3305         tgt = lmv_find_target(lmv, &och->och_fid);
3306         if (IS_ERR(tgt))
3307                 RETURN(PTR_ERR(tgt));
3308
3309         RETURN(md_clear_open_replay_data(tgt->ltd_exp, och));
3310 }
3311
3312 static int lmv_get_remote_perm(struct obd_export *exp,
3313                                const struct lu_fid *fid,
3314                                struct obd_capa *oc, __u32 suppgid,
3315                                struct ptlrpc_request **request)
3316 {
3317         struct obd_device       *obd = exp->exp_obd;
3318         struct lmv_obd          *lmv = &obd->u.lmv;
3319         struct lmv_tgt_desc     *tgt;
3320         int                      rc;
3321         ENTRY;
3322
3323         rc = lmv_check_connect(obd);
3324         if (rc)
3325                 RETURN(rc);
3326
3327         tgt = lmv_find_target(lmv, fid);
3328         if (IS_ERR(tgt))
3329                 RETURN(PTR_ERR(tgt));
3330
3331         rc = md_get_remote_perm(tgt->ltd_exp, fid, oc, suppgid, request);
3332         RETURN(rc);
3333 }
3334
3335 static int lmv_renew_capa(struct obd_export *exp, struct obd_capa *oc,
3336                           renew_capa_cb_t cb)
3337 {
3338         struct obd_device       *obd = exp->exp_obd;
3339         struct lmv_obd          *lmv = &obd->u.lmv;
3340         struct lmv_tgt_desc     *tgt;
3341         int                      rc;
3342         ENTRY;
3343
3344         rc = lmv_check_connect(obd);
3345         if (rc)
3346                 RETURN(rc);
3347
3348         tgt = lmv_find_target(lmv, &oc->c_capa.lc_fid);
3349         if (IS_ERR(tgt))
3350                 RETURN(PTR_ERR(tgt));
3351
3352         rc = md_renew_capa(tgt->ltd_exp, oc, cb);
3353         RETURN(rc);
3354 }
3355
3356 int lmv_unpack_capa(struct obd_export *exp, struct ptlrpc_request *req,
3357                     const struct req_msg_field *field, struct obd_capa **oc)
3358 {
3359         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
3360         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
3361
3362         if (tgt == NULL || tgt->ltd_exp == NULL)
3363                 RETURN(-EINVAL);
3364         return md_unpack_capa(tgt->ltd_exp, req, field, oc);
3365 }
3366
3367 int lmv_intent_getattr_async(struct obd_export *exp,
3368                              struct md_enqueue_info *minfo,
3369                              struct ldlm_enqueue_info *einfo)
3370 {
3371         struct md_op_data       *op_data = &minfo->mi_data;
3372         struct obd_device       *obd = exp->exp_obd;
3373         struct lmv_obd          *lmv = &obd->u.lmv;
3374         struct lmv_tgt_desc     *tgt = NULL;
3375         int                      rc;
3376         ENTRY;
3377
3378         rc = lmv_check_connect(obd);
3379         if (rc)
3380                 RETURN(rc);
3381
3382         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
3383         if (IS_ERR(tgt))
3384                 RETURN(PTR_ERR(tgt));
3385
3386         rc = md_intent_getattr_async(tgt->ltd_exp, minfo, einfo);
3387         RETURN(rc);
3388 }
3389
3390 int lmv_revalidate_lock(struct obd_export *exp, struct lookup_intent *it,
3391                         struct lu_fid *fid, __u64 *bits)
3392 {
3393         struct obd_device       *obd = exp->exp_obd;
3394         struct lmv_obd          *lmv = &obd->u.lmv;
3395         struct lmv_tgt_desc     *tgt;
3396         int                      rc;
3397         ENTRY;
3398
3399         rc = lmv_check_connect(obd);
3400         if (rc)
3401                 RETURN(rc);
3402
3403         tgt = lmv_find_target(lmv, fid);
3404         if (IS_ERR(tgt))
3405                 RETURN(PTR_ERR(tgt));
3406
3407         rc = md_revalidate_lock(tgt->ltd_exp, it, fid, bits);
3408         RETURN(rc);
3409 }
3410
3411 int lmv_get_fid_from_lsm(struct obd_export *exp,
3412                          const struct lmv_stripe_md *lsm,
3413                          const char *name, int namelen, struct lu_fid *fid)
3414 {
3415         const struct lmv_oinfo *oinfo;
3416
3417         LASSERT(lsm != NULL);
3418         oinfo = lsm_name_to_stripe_info(lsm, name, namelen);
3419         if (IS_ERR(oinfo))
3420                 return PTR_ERR(oinfo);
3421
3422         *fid = oinfo->lmo_fid;
3423
3424         RETURN(0);
3425 }
3426
3427 /**
3428  * For lmv, only need to send request to master MDT, and the master MDT will
3429  * process with other slave MDTs. The only exception is Q_GETOQUOTA for which
3430  * we directly fetch data from the slave MDTs.
3431  */
3432 int lmv_quotactl(struct obd_device *unused, struct obd_export *exp,
3433                  struct obd_quotactl *oqctl)
3434 {
3435         struct obd_device   *obd = class_exp2obd(exp);
3436         struct lmv_obd      *lmv = &obd->u.lmv;
3437         struct lmv_tgt_desc *tgt = lmv->tgts[0];
3438         int                  rc = 0;
3439         __u32                i;
3440         __u64                curspace, curinodes;
3441         ENTRY;
3442
3443         if (tgt == NULL ||
3444             tgt->ltd_exp == NULL ||
3445             !tgt->ltd_active ||
3446             lmv->desc.ld_tgt_count == 0) {
3447                 CERROR("master lmv inactive\n");
3448                 RETURN(-EIO);
3449         }
3450
3451         if (oqctl->qc_cmd != Q_GETOQUOTA) {
3452                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
3453                 RETURN(rc);
3454         }
3455
3456         curspace = curinodes = 0;
3457         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
3458                 int err;
3459                 tgt = lmv->tgts[i];
3460
3461                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active)
3462                         continue;
3463
3464                 err = obd_quotactl(tgt->ltd_exp, oqctl);
3465                 if (err) {
3466                         CERROR("getquota on mdt %d failed. %d\n", i, err);
3467                         if (!rc)
3468                                 rc = err;
3469                 } else {
3470                         curspace += oqctl->qc_dqblk.dqb_curspace;
3471                         curinodes += oqctl->qc_dqblk.dqb_curinodes;
3472                 }
3473         }
3474         oqctl->qc_dqblk.dqb_curspace = curspace;
3475         oqctl->qc_dqblk.dqb_curinodes = curinodes;
3476
3477         RETURN(rc);
3478 }
3479
3480 int lmv_quotacheck(struct obd_device *unused, struct obd_export *exp,
3481                    struct obd_quotactl *oqctl)
3482 {
3483         struct obd_device       *obd = class_exp2obd(exp);
3484         struct lmv_obd          *lmv = &obd->u.lmv;
3485         struct lmv_tgt_desc     *tgt;
3486         __u32                    i;
3487         int                      rc = 0;
3488         ENTRY;
3489
3490         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
3491                 int err;
3492                 tgt = lmv->tgts[i];
3493                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active) {
3494                         CERROR("lmv idx %d inactive\n", i);
3495                         RETURN(-EIO);
3496                 }
3497
3498                 err = obd_quotacheck(tgt->ltd_exp, oqctl);
3499                 if (err && !rc)
3500                         rc = err;
3501         }
3502
3503         RETURN(rc);
3504 }
3505
3506 int lmv_update_lsm_md(struct obd_export *exp, struct lmv_stripe_md *lsm,
3507                       struct mdt_body *body, ldlm_blocking_callback cb_blocking)
3508 {
3509         return lmv_revalidate_slaves(exp, body, lsm, cb_blocking, 0);
3510 }
3511
3512 int lmv_merge_attr(struct obd_export *exp, const struct lmv_stripe_md *lsm,
3513                    struct cl_attr *attr)
3514 {
3515 #ifdef __KERNEL__
3516         int i;
3517
3518         for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
3519                 struct inode *inode = lsm->lsm_md_oinfo[i].lmo_root;
3520
3521                 CDEBUG(D_INFO, ""DFID" size %llu, nlink %u, atime %lu ctime"
3522                        "%lu, mtime %lu.\n", PFID(&lsm->lsm_md_oinfo[i].lmo_fid),
3523                        i_size_read(inode), inode->i_nlink,
3524                        LTIME_S(inode->i_atime), LTIME_S(inode->i_ctime),
3525                        LTIME_S(inode->i_mtime));
3526
3527                 /* for slave stripe, it needs to subtract nlink for . and .. */
3528                 if (i != 0)
3529                         attr->cat_nlink += inode->i_nlink - 2;
3530                 else
3531                         attr->cat_nlink = inode->i_nlink;
3532
3533                 attr->cat_size += i_size_read(inode);
3534
3535                 if (attr->cat_atime < LTIME_S(inode->i_atime))
3536                         attr->cat_atime = LTIME_S(inode->i_atime);
3537
3538                 if (attr->cat_ctime < LTIME_S(inode->i_ctime))
3539                         attr->cat_ctime = LTIME_S(inode->i_ctime);
3540
3541                 if (attr->cat_mtime < LTIME_S(inode->i_mtime))
3542                         attr->cat_mtime = LTIME_S(inode->i_mtime);
3543         }
3544 #endif
3545         return 0;
3546 }
3547
3548 struct obd_ops lmv_obd_ops = {
3549         .o_owner                = THIS_MODULE,
3550         .o_setup                = lmv_setup,
3551         .o_cleanup              = lmv_cleanup,
3552         .o_precleanup           = lmv_precleanup,
3553         .o_process_config       = lmv_process_config,
3554         .o_connect              = lmv_connect,
3555         .o_disconnect           = lmv_disconnect,
3556         .o_statfs               = lmv_statfs,
3557         .o_get_info             = lmv_get_info,
3558         .o_set_info_async       = lmv_set_info_async,
3559         .o_packmd               = lmv_packmd,
3560         .o_unpackmd             = lmv_unpackmd,
3561         .o_notify               = lmv_notify,
3562         .o_get_uuid             = lmv_get_uuid,
3563         .o_iocontrol            = lmv_iocontrol,
3564         .o_quotacheck           = lmv_quotacheck,
3565         .o_quotactl             = lmv_quotactl
3566 };
3567
3568 struct md_ops lmv_md_ops = {
3569         .m_getstatus            = lmv_getstatus,
3570         .m_null_inode           = lmv_null_inode,
3571         .m_find_cbdata          = lmv_find_cbdata,
3572         .m_close                = lmv_close,
3573         .m_create               = lmv_create,
3574         .m_done_writing         = lmv_done_writing,
3575         .m_enqueue              = lmv_enqueue,
3576         .m_getattr              = lmv_getattr,
3577         .m_getxattr             = lmv_getxattr,
3578         .m_getattr_name         = lmv_getattr_name,
3579         .m_intent_lock          = lmv_intent_lock,
3580         .m_link                 = lmv_link,
3581         .m_rename               = lmv_rename,
3582         .m_setattr              = lmv_setattr,
3583         .m_setxattr             = lmv_setxattr,
3584         .m_fsync                = lmv_fsync,
3585         .m_read_page            = lmv_read_page,
3586         .m_unlink               = lmv_unlink,
3587         .m_init_ea_size         = lmv_init_ea_size,
3588         .m_cancel_unused        = lmv_cancel_unused,
3589         .m_set_lock_data        = lmv_set_lock_data,
3590         .m_lock_match           = lmv_lock_match,
3591         .m_get_lustre_md        = lmv_get_lustre_md,
3592         .m_free_lustre_md       = lmv_free_lustre_md,
3593         .m_update_lsm_md        = lmv_update_lsm_md,
3594         .m_merge_attr           = lmv_merge_attr,
3595         .m_set_open_replay_data = lmv_set_open_replay_data,
3596         .m_clear_open_replay_data = lmv_clear_open_replay_data,
3597         .m_renew_capa           = lmv_renew_capa,
3598         .m_unpack_capa          = lmv_unpack_capa,
3599         .m_get_remote_perm      = lmv_get_remote_perm,
3600         .m_intent_getattr_async = lmv_intent_getattr_async,
3601         .m_revalidate_lock      = lmv_revalidate_lock,
3602         .m_get_fid_from_lsm     = lmv_get_fid_from_lsm,
3603 };
3604
3605 int __init lmv_init(void)
3606 {
3607         return class_register_type(&lmv_obd_ops, &lmv_md_ops, true, NULL,
3608 #ifndef HAVE_ONLY_PROCFS_SEQ
3609                                    NULL,
3610 #endif
3611                                    LUSTRE_LMV_NAME, NULL);
3612 }
3613
3614 #ifdef __KERNEL__
3615 static void lmv_exit(void)
3616 {
3617         class_unregister_type(LUSTRE_LMV_NAME);
3618 }
3619
3620 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
3621 MODULE_DESCRIPTION("Lustre Logical Metadata Volume OBD driver");
3622 MODULE_LICENSE("GPL");
3623
3624 module_init(lmv_init);
3625 module_exit(lmv_exit);
3626 #endif