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LU-12624 lod: alloc dir stripes by QoS
[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.gnu.org/licenses/gpl-2.0.html
19  *
20  * GPL HEADER END
21  */
22 /*
23  * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
24  * Use is subject to license terms.
25  *
26  * Copyright (c) 2011, 2017, Intel Corporation.
27  */
28 /*
29  * This file is part of Lustre, http://www.lustre.org/
30  * Lustre is a trademark of Sun Microsystems, Inc.
31  */
32
33 #define DEBUG_SUBSYSTEM S_LMV
34
35 #include <linux/file.h>
36 #include <linux/module.h>
37 #include <linux/init.h>
38 #include <linux/user_namespace.h>
39 #ifdef HAVE_UIDGID_HEADER
40 # include <linux/uidgid.h>
41 #endif
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
49 #include <obd_support.h>
50 #include <lustre_lib.h>
51 #include <lustre_net.h>
52 #include <obd_class.h>
53 #include <lustre_lmv.h>
54 #include <lprocfs_status.h>
55 #include <cl_object.h>
56 #include <lustre_fid.h>
57 #include <uapi/linux/lustre/lustre_ioctl.h>
58 #include <lustre_kernelcomm.h>
59 #include "lmv_internal.h"
60
61 static int lmv_check_connect(struct obd_device *obd);
62
63 void lmv_activate_target(struct lmv_obd *lmv, struct lmv_tgt_desc *tgt,
64                          int activate)
65 {
66         if (tgt->ltd_active == activate)
67                 return;
68
69         tgt->ltd_active = activate;
70         lmv->lmv_mdt_descs.ltd_lmv_desc.ld_active_tgt_count +=
71                 (activate ? 1 : -1);
72
73         tgt->ltd_exp->exp_obd->obd_inactive = !activate;
74 }
75
76 /**
77  * Error codes:
78  *
79  *  -EINVAL  : UUID can't be found in the LMV's target list
80  *  -ENOTCONN: The UUID is found, but the target connection is bad (!)
81  *  -EBADF   : The UUID is found, but the OBD of the wrong type (!)
82  */
83 static int lmv_set_mdc_active(struct lmv_obd *lmv,
84                               const struct obd_uuid *uuid,
85                               int activate)
86 {
87         struct lu_tgt_desc *tgt = NULL;
88         struct obd_device *obd;
89         int rc = 0;
90
91         ENTRY;
92
93         CDEBUG(D_INFO, "Searching in lmv %p for uuid %s (activate=%d)\n",
94                         lmv, uuid->uuid, activate);
95
96         spin_lock(&lmv->lmv_lock);
97         lmv_foreach_connected_tgt(lmv, tgt) {
98                 CDEBUG(D_INFO, "Target idx %d is %s conn %#llx\n",
99                        tgt->ltd_index, tgt->ltd_uuid.uuid,
100                        tgt->ltd_exp->exp_handle.h_cookie);
101
102                 if (obd_uuid_equals(uuid, &tgt->ltd_uuid))
103                         break;
104         }
105
106         if (!tgt)
107                 GOTO(out_lmv_lock, rc = -EINVAL);
108
109         obd = class_exp2obd(tgt->ltd_exp);
110         if (obd == NULL)
111                 GOTO(out_lmv_lock, rc = -ENOTCONN);
112
113         CDEBUG(D_INFO, "Found OBD %s=%s device %d (%p) type %s at LMV idx %d\n",
114                obd->obd_name, obd->obd_uuid.uuid, obd->obd_minor, obd,
115                obd->obd_type->typ_name, tgt->ltd_index);
116         LASSERT(strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) == 0);
117
118         if (tgt->ltd_active == activate) {
119                 CDEBUG(D_INFO, "OBD %p already %sactive!\n", obd,
120                        activate ? "" : "in");
121                 GOTO(out_lmv_lock, rc);
122         }
123
124         CDEBUG(D_INFO, "Marking OBD %p %sactive\n", obd,
125                activate ? "" : "in");
126         lmv_activate_target(lmv, tgt, activate);
127         EXIT;
128
129  out_lmv_lock:
130         spin_unlock(&lmv->lmv_lock);
131         return rc;
132 }
133
134 struct obd_uuid *lmv_get_uuid(struct obd_export *exp)
135 {
136         struct lmv_obd *lmv = &exp->exp_obd->u.lmv;
137         struct lmv_tgt_desc *tgt = lmv_tgt(lmv, 0);
138
139         return (tgt == NULL) ? NULL : obd_get_uuid(tgt->ltd_exp);
140 }
141
142 static int lmv_notify(struct obd_device *obd, struct obd_device *watched,
143                       enum obd_notify_event ev)
144 {
145         struct obd_connect_data *conn_data;
146         struct lmv_obd          *lmv = &obd->u.lmv;
147         struct obd_uuid         *uuid;
148         int                      rc = 0;
149         ENTRY;
150
151         if (strcmp(watched->obd_type->typ_name, LUSTRE_MDC_NAME)) {
152                 CERROR("unexpected notification of %s %s!\n",
153                        watched->obd_type->typ_name,
154                        watched->obd_name);
155                 RETURN(-EINVAL);
156         }
157
158         uuid = &watched->u.cli.cl_target_uuid;
159         if (ev == OBD_NOTIFY_ACTIVE || ev == OBD_NOTIFY_INACTIVE) {
160                 /*
161                  * Set MDC as active before notifying the observer, so the
162                  * observer can use the MDC normally.
163                  */
164                 rc = lmv_set_mdc_active(lmv, uuid,
165                                         ev == OBD_NOTIFY_ACTIVE);
166                 if (rc) {
167                         CERROR("%sactivation of %s failed: %d\n",
168                                ev == OBD_NOTIFY_ACTIVE ? "" : "de",
169                                uuid->uuid, rc);
170                         RETURN(rc);
171                 }
172         } else if (ev == OBD_NOTIFY_OCD) {
173                 conn_data = &watched->u.cli.cl_import->imp_connect_data;
174                 /*
175                  * XXX: Make sure that ocd_connect_flags from all targets are
176                  * the same. Otherwise one of MDTs runs wrong version or
177                  * something like this.  --umka
178                  */
179                 obd->obd_self_export->exp_connect_data = *conn_data;
180         }
181
182         /*
183          * Pass the notification up the chain.
184          */
185         if (obd->obd_observer)
186                 rc = obd_notify(obd->obd_observer, watched, ev);
187
188         RETURN(rc);
189 }
190
191 static int lmv_connect(const struct lu_env *env,
192                        struct obd_export **pexp, struct obd_device *obd,
193                        struct obd_uuid *cluuid, struct obd_connect_data *data,
194                        void *localdata)
195 {
196         struct lmv_obd *lmv = &obd->u.lmv;
197         struct lustre_handle conn = { 0 };
198         struct obd_export *exp;
199         int rc;
200         ENTRY;
201
202         rc = class_connect(&conn, obd, cluuid);
203         if (rc) {
204                 CERROR("class_connection() returned %d\n", rc);
205                 RETURN(rc);
206         }
207
208         exp = class_conn2export(&conn);
209
210         lmv->connected = 0;
211         lmv->conn_data = *data;
212         lmv->lmv_cache = localdata;
213
214         lmv->lmv_tgts_kobj = kobject_create_and_add("target_obds",
215                                                     &obd->obd_kset.kobj);
216         if (!lmv->lmv_tgts_kobj) {
217                 CERROR("%s: cannot create /sys/fs/lustre/%s/%s/target_obds\n",
218                        obd->obd_name, obd->obd_type->typ_name, obd->obd_name);
219         }
220
221         rc = lmv_check_connect(obd);
222         if (rc != 0)
223                 GOTO(out_sysfs, rc);
224
225         *pexp = exp;
226
227         RETURN(rc);
228
229 out_sysfs:
230         if (lmv->lmv_tgts_kobj)
231                 kobject_put(lmv->lmv_tgts_kobj);
232
233         class_disconnect(exp);
234
235         return rc;
236 }
237
238 static int lmv_init_ea_size(struct obd_export *exp, __u32 easize,
239                             __u32 def_easize)
240 {
241         struct obd_device *obd = exp->exp_obd;
242         struct lmv_obd *lmv = &obd->u.lmv;
243         struct lmv_tgt_desc *tgt;
244         int change = 0;
245         int rc = 0;
246
247         ENTRY;
248
249         if (lmv->max_easize < easize) {
250                 lmv->max_easize = easize;
251                 change = 1;
252         }
253         if (lmv->max_def_easize < def_easize) {
254                 lmv->max_def_easize = def_easize;
255                 change = 1;
256         }
257
258         if (change == 0)
259                 RETURN(0);
260
261         if (lmv->connected == 0)
262                 RETURN(0);
263
264         lmv_foreach_connected_tgt(lmv, tgt) {
265                 if (!tgt->ltd_active)
266                         continue;
267
268                 rc = md_init_ea_size(tgt->ltd_exp, easize, def_easize);
269                 if (rc) {
270                         CERROR("%s: obd_init_ea_size() failed on MDT target %d:"
271                                " rc = %d\n", obd->obd_name, tgt->ltd_index, rc);
272                         break;
273                 }
274         }
275         RETURN(rc);
276 }
277
278 #define MAX_STRING_SIZE 128
279
280 int lmv_connect_mdc(struct obd_device *obd, struct lmv_tgt_desc *tgt)
281 {
282         struct lmv_obd          *lmv = &obd->u.lmv;
283         struct obd_device       *mdc_obd;
284         struct obd_export       *mdc_exp;
285         struct lu_fld_target     target;
286         int                      rc;
287         ENTRY;
288
289         mdc_obd = class_find_client_obd(&tgt->ltd_uuid, LUSTRE_MDC_NAME,
290                                         &obd->obd_uuid);
291         if (!mdc_obd) {
292                 CERROR("target %s not attached\n", tgt->ltd_uuid.uuid);
293                 RETURN(-EINVAL);
294         }
295
296         CDEBUG(D_CONFIG, "connect to %s(%s) - %s, %s\n",
297                mdc_obd->obd_name, mdc_obd->obd_uuid.uuid,
298                tgt->ltd_uuid.uuid, obd->obd_uuid.uuid);
299
300         if (!mdc_obd->obd_set_up) {
301                 CERROR("target %s is not set up\n", tgt->ltd_uuid.uuid);
302                 RETURN(-EINVAL);
303         }
304
305         rc = obd_connect(NULL, &mdc_exp, mdc_obd, &obd->obd_uuid,
306                          &lmv->conn_data, lmv->lmv_cache);
307         if (rc) {
308                 CERROR("target %s connect error %d\n", tgt->ltd_uuid.uuid, rc);
309                 RETURN(rc);
310         }
311
312         /*
313          * Init fid sequence client for this mdc and add new fld target.
314          */
315         rc = obd_fid_init(mdc_obd, mdc_exp, LUSTRE_SEQ_METADATA);
316         if (rc)
317                 RETURN(rc);
318
319         target.ft_srv = NULL;
320         target.ft_exp = mdc_exp;
321         target.ft_idx = tgt->ltd_index;
322
323         fld_client_add_target(&lmv->lmv_fld, &target);
324
325         rc = obd_register_observer(mdc_obd, obd);
326         if (rc) {
327                 obd_disconnect(mdc_exp);
328                 CERROR("target %s register_observer error %d\n",
329                        tgt->ltd_uuid.uuid, rc);
330                 RETURN(rc);
331         }
332
333         if (obd->obd_observer) {
334                 /*
335                  * Tell the observer about the new target.
336                  */
337                 rc = obd_notify(obd->obd_observer, mdc_exp->exp_obd,
338                                 OBD_NOTIFY_ACTIVE);
339                 if (rc) {
340                         obd_disconnect(mdc_exp);
341                         RETURN(rc);
342                 }
343         }
344
345         tgt->ltd_active = 1;
346         tgt->ltd_exp = mdc_exp;
347         lmv->lmv_mdt_descs.ltd_lmv_desc.ld_active_tgt_count++;
348
349         md_init_ea_size(tgt->ltd_exp, lmv->max_easize, lmv->max_def_easize);
350
351         rc = lu_qos_add_tgt(&lmv->lmv_qos, tgt);
352         if (rc) {
353                 obd_disconnect(mdc_exp);
354                 RETURN(rc);
355         }
356
357         CDEBUG(D_CONFIG, "Connected to %s(%s) successfully (%d)\n",
358                 mdc_obd->obd_name, mdc_obd->obd_uuid.uuid,
359                 atomic_read(&obd->obd_refcount));
360
361         lmv_statfs_check_update(obd, tgt);
362
363         if (lmv->lmv_tgts_kobj)
364                 /* Even if we failed to create the link, that's fine */
365                 rc = sysfs_create_link(lmv->lmv_tgts_kobj,
366                                        &mdc_obd->obd_kset.kobj,
367                                        mdc_obd->obd_name);
368         RETURN(0);
369 }
370
371 static void lmv_del_target(struct lmv_obd *lmv, struct lu_tgt_desc *tgt)
372 {
373         LASSERT(tgt);
374         ltd_del_tgt(&lmv->lmv_mdt_descs, tgt);
375         OBD_FREE_PTR(tgt);
376 }
377
378 static int lmv_add_target(struct obd_device *obd, struct obd_uuid *uuidp,
379                            __u32 index, int gen)
380 {
381         struct obd_device *mdc_obd;
382         struct lmv_obd *lmv = &obd->u.lmv;
383         struct lmv_tgt_desc *tgt;
384         struct lu_tgt_descs *ltd = &lmv->lmv_mdt_descs;
385         int rc = 0;
386
387         ENTRY;
388
389         CDEBUG(D_CONFIG, "Target uuid: %s. index %d\n", uuidp->uuid, index);
390         mdc_obd = class_find_client_obd(uuidp, LUSTRE_MDC_NAME,
391                                         &obd->obd_uuid);
392         if (!mdc_obd) {
393                 CERROR("%s: Target %s not attached: rc = %d\n",
394                        obd->obd_name, uuidp->uuid, -EINVAL);
395                 RETURN(-EINVAL);
396         }
397
398         OBD_ALLOC_PTR(tgt);
399         if (!tgt)
400                 RETURN(-ENOMEM);
401
402         mutex_init(&tgt->ltd_fid_mutex);
403         tgt->ltd_index = index;
404         tgt->ltd_uuid = *uuidp;
405         tgt->ltd_active = 0;
406
407         mutex_lock(&ltd->ltd_mutex);
408         rc = ltd_add_tgt(ltd, tgt);
409         mutex_unlock(&ltd->ltd_mutex);
410
411         if (rc)
412                 GOTO(out_tgt, rc);
413
414         if (!lmv->connected)
415                 /* lmv_check_connect() will connect this target. */
416                 RETURN(0);
417
418         rc = lmv_connect_mdc(obd, tgt);
419         if (!rc) {
420                 int easize = sizeof(struct lmv_stripe_md) +
421                         lmv->lmv_mdt_count * sizeof(struct lu_fid);
422
423                 lmv_init_ea_size(obd->obd_self_export, easize, 0);
424         }
425
426         RETURN(rc);
427
428 out_tgt:
429         OBD_FREE_PTR(tgt);
430         return rc;
431 }
432
433 static int lmv_check_connect(struct obd_device *obd)
434 {
435         struct lmv_obd *lmv = &obd->u.lmv;
436         struct lmv_tgt_desc *tgt;
437         int easize;
438         int rc;
439
440         ENTRY;
441
442         if (lmv->connected)
443                 RETURN(0);
444
445         mutex_lock(&lmv->lmv_mdt_descs.ltd_mutex);
446         if (lmv->connected)
447                 GOTO(unlock, rc = 0);
448
449         if (!lmv->lmv_mdt_count) {
450                 CERROR("%s: no targets configured: rc = -EINVAL\n",
451                        obd->obd_name);
452                 GOTO(unlock, rc = -EINVAL);
453         }
454
455         if (!lmv_mdt0_inited(lmv)) {
456                 CERROR("%s: no target configured for index 0: rc = -EINVAL.\n",
457                        obd->obd_name);
458                 GOTO(unlock, rc = -EINVAL);
459         }
460
461         CDEBUG(D_CONFIG, "Time to connect %s to %s\n",
462                obd->obd_uuid.uuid, obd->obd_name);
463
464         lmv_foreach_tgt(lmv, tgt) {
465                 rc = lmv_connect_mdc(obd, tgt);
466                 if (rc)
467                         GOTO(out_disc, rc);
468         }
469
470         lmv->connected = 1;
471         easize = lmv_mds_md_size(lmv->lmv_mdt_count, LMV_MAGIC);
472         lmv_init_ea_size(obd->obd_self_export, easize, 0);
473         EXIT;
474 unlock:
475         mutex_unlock(&lmv->lmv_mdt_descs.ltd_mutex);
476
477         return rc;
478
479 out_disc:
480         lmv_foreach_tgt(lmv, tgt) {
481                 tgt->ltd_active = 0;
482                 if (!tgt->ltd_exp)
483                         continue;
484
485                 --lmv->lmv_mdt_descs.ltd_lmv_desc.ld_active_tgt_count;
486                 obd_disconnect(tgt->ltd_exp);
487         }
488
489         goto unlock;
490 }
491
492 static int lmv_disconnect_mdc(struct obd_device *obd, struct lmv_tgt_desc *tgt)
493 {
494         struct lmv_obd         *lmv = &obd->u.lmv;
495         struct obd_device      *mdc_obd;
496         int                     rc;
497         ENTRY;
498
499         LASSERT(tgt != NULL);
500         LASSERT(obd != NULL);
501
502         mdc_obd = class_exp2obd(tgt->ltd_exp);
503
504         if (mdc_obd) {
505                 mdc_obd->obd_force = obd->obd_force;
506                 mdc_obd->obd_fail = obd->obd_fail;
507                 mdc_obd->obd_no_recov = obd->obd_no_recov;
508
509                 if (lmv->lmv_tgts_kobj)
510                         sysfs_remove_link(lmv->lmv_tgts_kobj,
511                                           mdc_obd->obd_name);
512         }
513
514         rc = obd_fid_fini(tgt->ltd_exp->exp_obd);
515         if (rc)
516                 CERROR("Can't finanize fids factory\n");
517
518         CDEBUG(D_INFO, "Disconnected from %s(%s) successfully\n",
519                tgt->ltd_exp->exp_obd->obd_name,
520                tgt->ltd_exp->exp_obd->obd_uuid.uuid);
521
522         obd_register_observer(tgt->ltd_exp->exp_obd, NULL);
523         rc = obd_disconnect(tgt->ltd_exp);
524         if (rc) {
525                 if (tgt->ltd_active) {
526                         CERROR("Target %s disconnect error %d\n",
527                                tgt->ltd_uuid.uuid, rc);
528                 }
529         }
530
531         lmv_activate_target(lmv, tgt, 0);
532         tgt->ltd_exp = NULL;
533         RETURN(0);
534 }
535
536 static int lmv_disconnect(struct obd_export *exp)
537 {
538         struct obd_device *obd = class_exp2obd(exp);
539         struct lmv_obd *lmv = &obd->u.lmv;
540         struct lmv_tgt_desc *tgt;
541         int rc;
542
543         ENTRY;
544
545         lmv_foreach_connected_tgt(lmv, tgt)
546                 lmv_disconnect_mdc(obd, tgt);
547
548         if (lmv->lmv_tgts_kobj)
549                 kobject_put(lmv->lmv_tgts_kobj);
550
551         if (!lmv->connected)
552                 class_export_put(exp);
553         rc = class_disconnect(exp);
554         lmv->connected = 0;
555
556         RETURN(rc);
557 }
558
559 static int lmv_fid2path(struct obd_export *exp, int len, void *karg,
560                         void __user *uarg)
561 {
562         struct obd_device *obddev = class_exp2obd(exp);
563         struct lmv_obd *lmv = &obddev->u.lmv;
564         struct getinfo_fid2path *gf;
565         struct lmv_tgt_desc *tgt;
566         struct getinfo_fid2path *remote_gf = NULL;
567         struct lu_fid root_fid;
568         int remote_gf_size = 0;
569         int rc;
570
571         gf = karg;
572         tgt = lmv_fid2tgt(lmv, &gf->gf_fid);
573         if (IS_ERR(tgt))
574                 RETURN(PTR_ERR(tgt));
575
576         root_fid = *gf->gf_u.gf_root_fid;
577         LASSERT(fid_is_sane(&root_fid));
578
579 repeat_fid2path:
580         rc = obd_iocontrol(OBD_IOC_FID2PATH, tgt->ltd_exp, len, gf, uarg);
581         if (rc != 0 && rc != -EREMOTE)
582                 GOTO(out_fid2path, rc);
583
584         /* If remote_gf != NULL, it means just building the
585          * path on the remote MDT, copy this path segement to gf */
586         if (remote_gf != NULL) {
587                 struct getinfo_fid2path *ori_gf;
588                 char *ptr;
589                 int len;
590
591                 ori_gf = (struct getinfo_fid2path *)karg;
592                 if (strlen(ori_gf->gf_u.gf_path) + 1 +
593                     strlen(gf->gf_u.gf_path) + 1 > ori_gf->gf_pathlen)
594                         GOTO(out_fid2path, rc = -EOVERFLOW);
595
596                 ptr = ori_gf->gf_u.gf_path;
597
598                 len = strlen(gf->gf_u.gf_path);
599                 /* move the current path to the right to release space
600                  * for closer-to-root part */
601                 memmove(ptr + len + 1, ptr, strlen(ori_gf->gf_u.gf_path));
602                 memcpy(ptr, gf->gf_u.gf_path, len);
603                 ptr[len] = '/';
604         }
605
606         CDEBUG(D_INFO, "%s: get path %s "DFID" rec: %llu ln: %u\n",
607                tgt->ltd_exp->exp_obd->obd_name,
608                gf->gf_u.gf_path, PFID(&gf->gf_fid), gf->gf_recno,
609                gf->gf_linkno);
610
611         if (rc == 0)
612                 GOTO(out_fid2path, rc);
613
614         /* sigh, has to go to another MDT to do path building further */
615         if (remote_gf == NULL) {
616                 remote_gf_size = sizeof(*remote_gf) + PATH_MAX;
617                 OBD_ALLOC(remote_gf, remote_gf_size);
618                 if (remote_gf == NULL)
619                         GOTO(out_fid2path, rc = -ENOMEM);
620                 remote_gf->gf_pathlen = PATH_MAX;
621         }
622
623         if (!fid_is_sane(&gf->gf_fid)) {
624                 CERROR("%s: invalid FID "DFID": rc = %d\n",
625                        tgt->ltd_exp->exp_obd->obd_name,
626                        PFID(&gf->gf_fid), -EINVAL);
627                 GOTO(out_fid2path, rc = -EINVAL);
628         }
629
630         tgt = lmv_fid2tgt(lmv, &gf->gf_fid);
631         if (IS_ERR(tgt))
632                 GOTO(out_fid2path, rc = -EINVAL);
633
634         remote_gf->gf_fid = gf->gf_fid;
635         remote_gf->gf_recno = -1;
636         remote_gf->gf_linkno = -1;
637         memset(remote_gf->gf_u.gf_path, 0, remote_gf->gf_pathlen);
638         *remote_gf->gf_u.gf_root_fid = root_fid;
639         gf = remote_gf;
640         goto repeat_fid2path;
641
642 out_fid2path:
643         if (remote_gf != NULL)
644                 OBD_FREE(remote_gf, remote_gf_size);
645         RETURN(rc);
646 }
647
648 static int lmv_hsm_req_count(struct lmv_obd *lmv,
649                              const struct hsm_user_request *hur,
650                              const struct lmv_tgt_desc *tgt_mds)
651 {
652         struct lmv_tgt_desc *curr_tgt;
653         __u32 i;
654         int nr = 0;
655
656         /* count how many requests must be sent to the given target */
657         for (i = 0; i < hur->hur_request.hr_itemcount; i++) {
658                 curr_tgt = lmv_fid2tgt(lmv, &hur->hur_user_item[i].hui_fid);
659                 if (IS_ERR(curr_tgt))
660                         RETURN(PTR_ERR(curr_tgt));
661                 if (obd_uuid_equals(&curr_tgt->ltd_uuid, &tgt_mds->ltd_uuid))
662                         nr++;
663         }
664         return nr;
665 }
666
667 static int lmv_hsm_req_build(struct lmv_obd *lmv,
668                               struct hsm_user_request *hur_in,
669                               const struct lmv_tgt_desc *tgt_mds,
670                               struct hsm_user_request *hur_out)
671 {
672         __u32 i, nr_out;
673         struct lmv_tgt_desc *curr_tgt;
674
675         /* build the hsm_user_request for the given target */
676         hur_out->hur_request = hur_in->hur_request;
677         nr_out = 0;
678         for (i = 0; i < hur_in->hur_request.hr_itemcount; i++) {
679                 curr_tgt = lmv_fid2tgt(lmv, &hur_in->hur_user_item[i].hui_fid);
680                 if (IS_ERR(curr_tgt))
681                         RETURN(PTR_ERR(curr_tgt));
682                 if (obd_uuid_equals(&curr_tgt->ltd_uuid, &tgt_mds->ltd_uuid)) {
683                         hur_out->hur_user_item[nr_out] =
684                                                 hur_in->hur_user_item[i];
685                         nr_out++;
686                 }
687         }
688         hur_out->hur_request.hr_itemcount = nr_out;
689         memcpy(hur_data(hur_out), hur_data(hur_in),
690                hur_in->hur_request.hr_data_len);
691
692         RETURN(0);
693 }
694
695 static int lmv_hsm_ct_unregister(struct obd_device *obd, unsigned int cmd,
696                                  int len, struct lustre_kernelcomm *lk,
697                                  void __user *uarg)
698 {
699         struct lmv_obd *lmv = &obd->u.lmv;
700         struct lu_tgt_desc *tgt;
701         int rc;
702
703         ENTRY;
704
705         /* unregister request (call from llapi_hsm_copytool_fini) */
706         lmv_foreach_connected_tgt(lmv, tgt)
707                 /* best effort: try to clean as much as possible
708                  * (continue on error) */
709                 obd_iocontrol(cmd, tgt->ltd_exp, len, lk, uarg);
710
711         /* Whatever the result, remove copytool from kuc groups.
712          * Unreached coordinators will get EPIPE on next requests
713          * and will unregister automatically.
714          */
715         rc = libcfs_kkuc_group_rem(&obd->obd_uuid, lk->lk_uid, lk->lk_group);
716
717         RETURN(rc);
718 }
719
720 static int lmv_hsm_ct_register(struct obd_device *obd, unsigned int cmd,
721                                int len, struct lustre_kernelcomm *lk,
722                                void __user *uarg)
723 {
724         struct lmv_obd *lmv = &obd->u.lmv;
725         struct file *filp;
726         bool any_set = false;
727         struct kkuc_ct_data *kcd;
728         size_t kcd_size;
729         struct lu_tgt_desc *tgt;
730         __u32 i;
731         int err;
732         int rc = 0;
733
734         ENTRY;
735
736         filp = fget(lk->lk_wfd);
737         if (!filp)
738                 RETURN(-EBADF);
739
740         if (lk->lk_flags & LK_FLG_DATANR)
741                 kcd_size = offsetof(struct kkuc_ct_data,
742                                     kcd_archives[lk->lk_data_count]);
743         else
744                 kcd_size = sizeof(*kcd);
745
746         OBD_ALLOC(kcd, kcd_size);
747         if (kcd == NULL)
748                 GOTO(err_fput, rc = -ENOMEM);
749
750         kcd->kcd_nr_archives = lk->lk_data_count;
751         if (lk->lk_flags & LK_FLG_DATANR) {
752                 kcd->kcd_magic = KKUC_CT_DATA_ARRAY_MAGIC;
753                 if (lk->lk_data_count > 0)
754                         memcpy(kcd->kcd_archives, lk->lk_data,
755                                sizeof(*kcd->kcd_archives) * lk->lk_data_count);
756         } else {
757                 kcd->kcd_magic = KKUC_CT_DATA_BITMAP_MAGIC;
758         }
759
760         rc = libcfs_kkuc_group_add(filp, &obd->obd_uuid, lk->lk_uid,
761                                    lk->lk_group, kcd, kcd_size);
762         OBD_FREE(kcd, kcd_size);
763         if (rc)
764                 GOTO(err_fput, rc);
765
766         /* All or nothing: try to register to all MDS.
767          * In case of failure, unregister from previous MDS,
768          * except if it because of inactive target. */
769         lmv_foreach_connected_tgt(lmv, tgt) {
770                 err = obd_iocontrol(cmd, tgt->ltd_exp, len, lk, uarg);
771                 if (err) {
772                         if (tgt->ltd_active) {
773                                 /* permanent error */
774                                 CERROR("%s: iocontrol MDC %s on MDT"
775                                        " idx %d cmd %x: err = %d\n",
776                                        lmv2obd_dev(lmv)->obd_name,
777                                        tgt->ltd_uuid.uuid, tgt->ltd_index, cmd,
778                                        err);
779                                 rc = err;
780                                 lk->lk_flags |= LK_FLG_STOP;
781                                 i = tgt->ltd_index;
782                                 /* unregister from previous MDS */
783                                 lmv_foreach_connected_tgt(lmv, tgt) {
784                                         if (tgt->ltd_index >= i)
785                                                 break;
786
787                                         obd_iocontrol(cmd, tgt->ltd_exp, len,
788                                                       lk, uarg);
789                                 }
790                                 GOTO(err_kkuc_rem, rc);
791                         }
792                         /* else: transient error.
793                          * kuc will register to the missing MDT
794                          * when it is back */
795                 } else {
796                         any_set = true;
797                 }
798         }
799
800         if (!any_set)
801                 /* no registration done: return error */
802                 GOTO(err_kkuc_rem, rc = -ENOTCONN);
803
804         RETURN(0);
805
806 err_kkuc_rem:
807         libcfs_kkuc_group_rem(&obd->obd_uuid, lk->lk_uid, lk->lk_group);
808
809 err_fput:
810         fput(filp);
811         return rc;
812 }
813
814 static int lmv_iocontrol(unsigned int cmd, struct obd_export *exp,
815                          int len, void *karg, void __user *uarg)
816 {
817         struct obd_device *obddev = class_exp2obd(exp);
818         struct lmv_obd *lmv = &obddev->u.lmv;
819         struct lu_tgt_desc *tgt = NULL;
820         int set = 0;
821         __u32 count = lmv->lmv_mdt_count;
822         int rc = 0;
823
824         ENTRY;
825
826         if (count == 0)
827                 RETURN(-ENOTTY);
828
829         switch (cmd) {
830         case IOC_OBD_STATFS: {
831                 struct obd_ioctl_data *data = karg;
832                 struct obd_device *mdc_obd;
833                 struct obd_statfs stat_buf = {0};
834                 __u32 index;
835
836                 memcpy(&index, data->ioc_inlbuf2, sizeof(__u32));
837
838                 if (index >= lmv->lmv_mdt_descs.ltd_tgts_size)
839                         RETURN(-ENODEV);
840
841                 tgt = lmv_tgt(lmv, index);
842                 if (!tgt || !tgt->ltd_active)
843                         RETURN(-ENODATA);
844
845                 mdc_obd = class_exp2obd(tgt->ltd_exp);
846                 if (!mdc_obd)
847                         RETURN(-EINVAL);
848
849                 /* copy UUID */
850                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(mdc_obd),
851                                  min((int) data->ioc_plen2,
852                                      (int) sizeof(struct obd_uuid))))
853                         RETURN(-EFAULT);
854
855                 rc = obd_statfs(NULL, tgt->ltd_exp, &stat_buf,
856                                 ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
857                                 0);
858                 if (rc)
859                         RETURN(rc);
860                 if (copy_to_user(data->ioc_pbuf1, &stat_buf,
861                                  min((int) data->ioc_plen1,
862                                      (int) sizeof(stat_buf))))
863                         RETURN(-EFAULT);
864                 break;
865         }
866         case OBD_IOC_QUOTACTL: {
867                 struct if_quotactl *qctl = karg;
868                 struct obd_quotactl *oqctl;
869
870                 if (qctl->qc_valid == QC_MDTIDX) {
871                         tgt = lmv_tgt(lmv, qctl->qc_idx);
872                 } else if (qctl->qc_valid == QC_UUID) {
873                         lmv_foreach_tgt(lmv, tgt) {
874                                 if (!obd_uuid_equals(&tgt->ltd_uuid,
875                                                      &qctl->obd_uuid))
876                                         continue;
877
878                                 if (!tgt->ltd_exp)
879                                         RETURN(-EINVAL);
880
881                                 break;
882                         }
883                 } else {
884                         RETURN(-EINVAL);
885                 }
886
887                 if (!tgt || !tgt->ltd_exp)
888                         RETURN(-EINVAL);
889
890                 OBD_ALLOC_PTR(oqctl);
891                 if (!oqctl)
892                         RETURN(-ENOMEM);
893
894                 QCTL_COPY(oqctl, qctl);
895                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
896                 if (rc == 0) {
897                         QCTL_COPY(qctl, oqctl);
898                         qctl->qc_valid = QC_MDTIDX;
899                         qctl->obd_uuid = tgt->ltd_uuid;
900                 }
901                 OBD_FREE_PTR(oqctl);
902                 break;
903         }
904         case LL_IOC_GET_CONNECT_FLAGS: {
905                 tgt = lmv_tgt(lmv, 0);
906                 rc = -ENODATA;
907                 if (tgt && tgt->ltd_exp)
908                         rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
909                 break;
910         }
911         case LL_IOC_FID2MDTIDX: {
912                 struct lu_fid *fid = karg;
913                 int             mdt_index;
914
915                 rc = lmv_fld_lookup(lmv, fid, &mdt_index);
916                 if (rc != 0)
917                         RETURN(rc);
918
919                 /* Note: this is from llite(see ll_dir_ioctl()), @uarg does not
920                  * point to user space memory for FID2MDTIDX. */
921                 *(__u32 *)uarg = mdt_index;
922                 break;
923         }
924         case OBD_IOC_FID2PATH: {
925                 rc = lmv_fid2path(exp, len, karg, uarg);
926                 break;
927         }
928         case LL_IOC_HSM_STATE_GET:
929         case LL_IOC_HSM_STATE_SET:
930         case LL_IOC_HSM_ACTION: {
931                 struct md_op_data *op_data = karg;
932
933                 tgt = lmv_fid2tgt(lmv, &op_data->op_fid1);
934                 if (IS_ERR(tgt))
935                         RETURN(PTR_ERR(tgt));
936
937                 if (tgt->ltd_exp == NULL)
938                         RETURN(-EINVAL);
939
940                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
941                 break;
942         }
943         case LL_IOC_HSM_PROGRESS: {
944                 const struct hsm_progress_kernel *hpk = karg;
945
946                 tgt = lmv_fid2tgt(lmv, &hpk->hpk_fid);
947                 if (IS_ERR(tgt))
948                         RETURN(PTR_ERR(tgt));
949                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
950                 break;
951         }
952         case LL_IOC_HSM_REQUEST: {
953                 struct hsm_user_request *hur = karg;
954                 unsigned int reqcount = hur->hur_request.hr_itemcount;
955
956                 if (reqcount == 0)
957                         RETURN(0);
958
959                 /* if the request is about a single fid
960                  * or if there is a single MDS, no need to split
961                  * the request. */
962                 if (reqcount == 1 || count == 1) {
963                         tgt = lmv_fid2tgt(lmv, &hur->hur_user_item[0].hui_fid);
964                         if (IS_ERR(tgt))
965                                 RETURN(PTR_ERR(tgt));
966                         rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
967                 } else {
968                         /* split fid list to their respective MDS */
969                         lmv_foreach_connected_tgt(lmv, tgt) {
970                                 int nr, rc1;
971                                 size_t reqlen;
972                                 struct hsm_user_request *req;
973
974                                 nr = lmv_hsm_req_count(lmv, hur, tgt);
975                                 if (nr < 0)
976                                         RETURN(nr);
977                                 if (nr == 0) /* nothing for this MDS */
978                                         continue;
979
980                                 /* build a request with fids for this MDS */
981                                 reqlen = offsetof(typeof(*hur),
982                                                   hur_user_item[nr])
983                                                 + hur->hur_request.hr_data_len;
984                                 OBD_ALLOC_LARGE(req, reqlen);
985                                 if (req == NULL)
986                                         RETURN(-ENOMEM);
987                                 rc1 = lmv_hsm_req_build(lmv, hur, tgt, req);
988                                 if (rc1 < 0)
989                                         GOTO(hsm_req_err, rc1);
990                                 rc1 = obd_iocontrol(cmd, tgt->ltd_exp, reqlen,
991                                                     req, uarg);
992 hsm_req_err:
993                                 if (rc1 != 0 && rc == 0)
994                                         rc = rc1;
995                                 OBD_FREE_LARGE(req, reqlen);
996                         }
997                 }
998                 break;
999         }
1000         case LL_IOC_LOV_SWAP_LAYOUTS: {
1001                 struct md_op_data *op_data = karg;
1002                 struct lmv_tgt_desc *tgt1, *tgt2;
1003
1004                 tgt1 = lmv_fid2tgt(lmv, &op_data->op_fid1);
1005                 if (IS_ERR(tgt1))
1006                         RETURN(PTR_ERR(tgt1));
1007
1008                 tgt2 = lmv_fid2tgt(lmv, &op_data->op_fid2);
1009                 if (IS_ERR(tgt2))
1010                         RETURN(PTR_ERR(tgt2));
1011
1012                 if ((tgt1->ltd_exp == NULL) || (tgt2->ltd_exp == NULL))
1013                         RETURN(-EINVAL);
1014
1015                 /* only files on same MDT can have their layouts swapped */
1016                 if (tgt1->ltd_index != tgt2->ltd_index)
1017                         RETURN(-EPERM);
1018
1019                 rc = obd_iocontrol(cmd, tgt1->ltd_exp, len, karg, uarg);
1020                 break;
1021         }
1022         case LL_IOC_HSM_CT_START: {
1023                 struct lustre_kernelcomm *lk = karg;
1024                 if (lk->lk_flags & LK_FLG_STOP)
1025                         rc = lmv_hsm_ct_unregister(obddev, cmd, len, lk, uarg);
1026                 else
1027                         rc = lmv_hsm_ct_register(obddev, cmd, len, lk, uarg);
1028                 break;
1029         }
1030         default:
1031                 lmv_foreach_connected_tgt(lmv, tgt) {
1032                         struct obd_device *mdc_obd;
1033                         int err;
1034
1035                         /* ll_umount_begin() sets force flag but for lmv, not
1036                          * mdc. Let's pass it through */
1037                         mdc_obd = class_exp2obd(tgt->ltd_exp);
1038                         mdc_obd->obd_force = obddev->obd_force;
1039                         err = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1040                         if (err) {
1041                                 if (tgt->ltd_active) {
1042                                         CERROR("error: iocontrol MDC %s on MDT"
1043                                                " idx %d cmd %x: err = %d\n",
1044                                                tgt->ltd_uuid.uuid,
1045                                                tgt->ltd_index, cmd, err);
1046                                         if (!rc)
1047                                                 rc = err;
1048                                 }
1049                         } else
1050                                 set = 1;
1051                 }
1052                 if (!set && !rc)
1053                         rc = -EIO;
1054         }
1055         RETURN(rc);
1056 }
1057
1058 int lmv_fid_alloc(const struct lu_env *env, struct obd_export *exp,
1059                   struct lu_fid *fid, struct md_op_data *op_data)
1060 {
1061         struct obd_device *obd = class_exp2obd(exp);
1062         struct lmv_obd *lmv = &obd->u.lmv;
1063         struct lmv_tgt_desc *tgt;
1064         int rc;
1065
1066         ENTRY;
1067
1068         LASSERT(op_data);
1069         LASSERT(fid);
1070
1071         tgt = lmv_tgt(lmv, op_data->op_mds);
1072         if (!tgt)
1073                 RETURN(-ENODEV);
1074
1075         if (!tgt->ltd_active || !tgt->ltd_exp)
1076                 RETURN(-ENODEV);
1077
1078         /*
1079          * New seq alloc and FLD setup should be atomic. Otherwise we may find
1080          * on server that seq in new allocated fid is not yet known.
1081          */
1082         mutex_lock(&tgt->ltd_fid_mutex);
1083         rc = obd_fid_alloc(NULL, tgt->ltd_exp, fid, NULL);
1084         mutex_unlock(&tgt->ltd_fid_mutex);
1085         if (rc > 0) {
1086                 LASSERT(fid_is_sane(fid));
1087                 rc = 0;
1088         }
1089
1090         RETURN(rc);
1091 }
1092
1093 static int lmv_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
1094 {
1095         struct lmv_obd *lmv = &obd->u.lmv;
1096         struct lmv_desc *desc;
1097         struct lnet_process_id lnet_id;
1098         int i = 0;
1099         int rc;
1100
1101         ENTRY;
1102
1103         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
1104                 CERROR("LMV setup requires a descriptor\n");
1105                 RETURN(-EINVAL);
1106         }
1107
1108         desc = (struct lmv_desc *)lustre_cfg_buf(lcfg, 1);
1109         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
1110                 CERROR("Lmv descriptor size wrong: %d > %d\n",
1111                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
1112                 RETURN(-EINVAL);
1113         }
1114
1115         obd_str2uuid(&lmv->lmv_mdt_descs.ltd_lmv_desc.ld_uuid,
1116                      desc->ld_uuid.uuid);
1117         lmv->lmv_mdt_descs.ltd_lmv_desc.ld_tgt_count = 0;
1118         lmv->lmv_mdt_descs.ltd_lmv_desc.ld_active_tgt_count = 0;
1119         lmv->lmv_mdt_descs.ltd_lmv_desc.ld_qos_maxage =
1120                 LMV_DESC_QOS_MAXAGE_DEFAULT;
1121         lmv->max_def_easize = 0;
1122         lmv->max_easize = 0;
1123
1124         spin_lock_init(&lmv->lmv_lock);
1125
1126         /*
1127          * initialize rr_index to lower 32bit of netid, so that client
1128          * can distribute subdirs evenly from the beginning.
1129          */
1130         while (LNetGetId(i++, &lnet_id) != -ENOENT) {
1131                 if (LNET_NETTYP(LNET_NIDNET(lnet_id.nid)) != LOLND) {
1132                         lmv->lmv_qos_rr_index = (u32)lnet_id.nid;
1133                         break;
1134                 }
1135         }
1136
1137         rc = lmv_tunables_init(obd);
1138         if (rc)
1139                 CWARN("%s: error adding LMV sysfs/debugfs files: rc = %d\n",
1140                       obd->obd_name, rc);
1141
1142         rc = fld_client_init(&lmv->lmv_fld, obd->obd_name,
1143                              LUSTRE_CLI_FLD_HASH_DHT);
1144         if (rc)
1145                 CERROR("Can't init FLD, err %d\n", rc);
1146
1147         rc = lu_tgt_descs_init(&lmv->lmv_mdt_descs, true);
1148         if (rc)
1149                 CWARN("%s: error initialize target table: rc = %d\n",
1150                       obd->obd_name, rc);
1151
1152         RETURN(rc);
1153 }
1154
1155 static int lmv_cleanup(struct obd_device *obd)
1156 {
1157         struct lmv_obd *lmv = &obd->u.lmv;
1158         struct lu_tgt_desc *tgt;
1159         struct lu_tgt_desc *tmp;
1160
1161         ENTRY;
1162
1163         fld_client_fini(&lmv->lmv_fld);
1164         lmv_foreach_tgt_safe(lmv, tgt, tmp)
1165                 lmv_del_target(lmv, tgt);
1166         lu_tgt_descs_fini(&lmv->lmv_mdt_descs);
1167
1168         RETURN(0);
1169 }
1170
1171 static int lmv_process_config(struct obd_device *obd, size_t len, void *buf)
1172 {
1173         struct lustre_cfg       *lcfg = buf;
1174         struct obd_uuid         obd_uuid;
1175         int                     gen;
1176         __u32                   index;
1177         int                     rc;
1178         ENTRY;
1179
1180         switch (lcfg->lcfg_command) {
1181         case LCFG_ADD_MDC:
1182                 /* modify_mdc_tgts add 0:lustre-clilmv  1:lustre-MDT0000_UUID
1183                  * 2:0  3:1  4:lustre-MDT0000-mdc_UUID */
1184                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(obd_uuid.uuid))
1185                         GOTO(out, rc = -EINVAL);
1186
1187                 obd_str2uuid(&obd_uuid,  lustre_cfg_buf(lcfg, 1));
1188
1189                 if (sscanf(lustre_cfg_buf(lcfg, 2), "%u", &index) != 1)
1190                         GOTO(out, rc = -EINVAL);
1191                 if (sscanf(lustre_cfg_buf(lcfg, 3), "%d", &gen) != 1)
1192                         GOTO(out, rc = -EINVAL);
1193                 rc = lmv_add_target(obd, &obd_uuid, index, gen);
1194                 GOTO(out, rc);
1195         default:
1196                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1197                 GOTO(out, rc = -EINVAL);
1198         }
1199 out:
1200         RETURN(rc);
1201 }
1202
1203 static int lmv_select_statfs_mdt(struct lmv_obd *lmv, __u32 flags)
1204 {
1205         int i;
1206
1207         if (flags & OBD_STATFS_FOR_MDT0)
1208                 return 0;
1209
1210         if (lmv->lmv_statfs_start || lmv->lmv_mdt_count == 1)
1211                 return lmv->lmv_statfs_start;
1212
1213         /* choose initial MDT for this client */
1214         for (i = 0;; i++) {
1215                 struct lnet_process_id lnet_id;
1216                 if (LNetGetId(i, &lnet_id) == -ENOENT)
1217                         break;
1218
1219                 if (LNET_NETTYP(LNET_NIDNET(lnet_id.nid)) != LOLND) {
1220                         /* We dont need a full 64-bit modulus, just enough
1221                          * to distribute the requests across MDTs evenly.
1222                          */
1223                         lmv->lmv_statfs_start = (u32)lnet_id.nid %
1224                                                 lmv->lmv_mdt_count;
1225                         break;
1226                 }
1227         }
1228
1229         return lmv->lmv_statfs_start;
1230 }
1231
1232 static int lmv_statfs(const struct lu_env *env, struct obd_export *exp,
1233                       struct obd_statfs *osfs, time64_t max_age, __u32 flags)
1234 {
1235         struct obd_device *obd = class_exp2obd(exp);
1236         struct lmv_obd *lmv = &obd->u.lmv;
1237         struct obd_statfs *temp;
1238         struct lu_tgt_desc *tgt;
1239         __u32 i;
1240         __u32 idx;
1241         int rc = 0;
1242
1243         ENTRY;
1244
1245         OBD_ALLOC(temp, sizeof(*temp));
1246         if (temp == NULL)
1247                 RETURN(-ENOMEM);
1248
1249         /* distribute statfs among MDTs */
1250         idx = lmv_select_statfs_mdt(lmv, flags);
1251
1252         for (i = 0; i < lmv->lmv_mdt_descs.ltd_tgts_size; i++, idx++) {
1253                 idx = idx % lmv->lmv_mdt_descs.ltd_tgts_size;
1254                 tgt = lmv_tgt(lmv, idx);
1255                 if (!tgt || !tgt->ltd_exp)
1256                         continue;
1257
1258                 rc = obd_statfs(env, tgt->ltd_exp, temp, max_age, flags);
1259                 if (rc) {
1260                         CERROR("%s: can't stat MDS #%d: rc = %d\n",
1261                                tgt->ltd_exp->exp_obd->obd_name, i, rc);
1262                         GOTO(out_free_temp, rc);
1263                 }
1264
1265                 if (temp->os_state & OS_STATE_SUM ||
1266                     flags == OBD_STATFS_FOR_MDT0) {
1267                         /* reset to the last aggregated values
1268                          * and don't sum with non-aggrated data */
1269                         /* If the statfs is from mount, it needs to retrieve
1270                          * necessary information from MDT0. i.e. mount does
1271                          * not need the merged osfs from all of MDT. Also
1272                          * clients can be mounted as long as MDT0 is in
1273                          * service */
1274                         *osfs = *temp;
1275                         break;
1276                 }
1277
1278                 if (i == 0) {
1279                         *osfs = *temp;
1280                 } else {
1281                         osfs->os_bavail += temp->os_bavail;
1282                         osfs->os_blocks += temp->os_blocks;
1283                         osfs->os_ffree += temp->os_ffree;
1284                         osfs->os_files += temp->os_files;
1285                         osfs->os_granted += temp->os_granted;
1286                 }
1287         }
1288
1289         EXIT;
1290 out_free_temp:
1291         OBD_FREE(temp, sizeof(*temp));
1292         return rc;
1293 }
1294
1295 static int lmv_statfs_update(void *cookie, int rc)
1296 {
1297         struct obd_info *oinfo = cookie;
1298         struct obd_device *obd = oinfo->oi_obd;
1299         struct lmv_obd *lmv = &obd->u.lmv;
1300         struct lmv_tgt_desc *tgt = oinfo->oi_tgt;
1301         struct obd_statfs *osfs = oinfo->oi_osfs;
1302
1303         /*
1304          * NB: don't deactivate TGT upon error, because we may not trigger async
1305          * statfs any longer, then there is no chance to activate TGT.
1306          */
1307         if (!rc) {
1308                 spin_lock(&lmv->lmv_lock);
1309                 tgt->ltd_statfs = *osfs;
1310                 tgt->ltd_statfs_age = ktime_get_seconds();
1311                 spin_unlock(&lmv->lmv_lock);
1312                 lmv->lmv_qos.lq_dirty = 1;
1313         }
1314
1315         return rc;
1316 }
1317
1318 /* update tgt statfs async if it's ld_qos_maxage old */
1319 int lmv_statfs_check_update(struct obd_device *obd, struct lmv_tgt_desc *tgt)
1320 {
1321         struct obd_info oinfo = {
1322                 .oi_obd = obd,
1323                 .oi_tgt = tgt,
1324                 .oi_cb_up = lmv_statfs_update,
1325         };
1326         int rc;
1327
1328         if (ktime_get_seconds() - tgt->ltd_statfs_age <
1329             obd->u.lmv.lmv_mdt_descs.ltd_lmv_desc.ld_qos_maxage)
1330                 return 0;
1331
1332         rc = obd_statfs_async(tgt->ltd_exp, &oinfo, 0, NULL);
1333
1334         return rc;
1335 }
1336
1337 static int lmv_get_root(struct obd_export *exp, const char *fileset,
1338                         struct lu_fid *fid)
1339 {
1340         struct obd_device *obd = exp->exp_obd;
1341         struct lmv_obd *lmv = &obd->u.lmv;
1342         struct lu_tgt_desc *tgt = lmv_tgt(lmv, 0);
1343         int rc;
1344
1345         ENTRY;
1346
1347         if (!tgt)
1348                 RETURN(-ENODEV);
1349
1350         rc = md_get_root(tgt->ltd_exp, fileset, fid);
1351         RETURN(rc);
1352 }
1353
1354 static int lmv_getxattr(struct obd_export *exp, const struct lu_fid *fid,
1355                         u64 obd_md_valid, const char *name, size_t buf_size,
1356                         struct ptlrpc_request **req)
1357 {
1358         struct obd_device *obd = exp->exp_obd;
1359         struct lmv_obd *lmv = &obd->u.lmv;
1360         struct lmv_tgt_desc *tgt;
1361         int rc;
1362
1363         ENTRY;
1364
1365         tgt = lmv_fid2tgt(lmv, fid);
1366         if (IS_ERR(tgt))
1367                 RETURN(PTR_ERR(tgt));
1368
1369         rc = md_getxattr(tgt->ltd_exp, fid, obd_md_valid, name, buf_size, req);
1370
1371         RETURN(rc);
1372 }
1373
1374 static int lmv_setxattr(struct obd_export *exp, const struct lu_fid *fid,
1375                         u64 obd_md_valid, const char *name,
1376                         const void *value, size_t value_size,
1377                         unsigned int xattr_flags, u32 suppgid,
1378                         struct ptlrpc_request **req)
1379 {
1380         struct obd_device *obd = exp->exp_obd;
1381         struct lmv_obd *lmv = &obd->u.lmv;
1382         struct lmv_tgt_desc *tgt;
1383         int rc;
1384
1385         ENTRY;
1386
1387         tgt = lmv_fid2tgt(lmv, fid);
1388         if (IS_ERR(tgt))
1389                 RETURN(PTR_ERR(tgt));
1390
1391         rc = md_setxattr(tgt->ltd_exp, fid, obd_md_valid, name,
1392                          value, value_size, xattr_flags, suppgid, req);
1393
1394         RETURN(rc);
1395 }
1396
1397 static int lmv_getattr(struct obd_export *exp, struct md_op_data *op_data,
1398                        struct ptlrpc_request **request)
1399 {
1400         struct obd_device *obd = exp->exp_obd;
1401         struct lmv_obd *lmv = &obd->u.lmv;
1402         struct lmv_tgt_desc *tgt;
1403         int rc;
1404
1405         ENTRY;
1406
1407         tgt = lmv_fid2tgt(lmv, &op_data->op_fid1);
1408         if (IS_ERR(tgt))
1409                 RETURN(PTR_ERR(tgt));
1410
1411         if (op_data->op_flags & MF_GET_MDT_IDX) {
1412                 op_data->op_mds = tgt->ltd_index;
1413                 RETURN(0);
1414         }
1415
1416         rc = md_getattr(tgt->ltd_exp, op_data, request);
1417
1418         RETURN(rc);
1419 }
1420
1421 static int lmv_null_inode(struct obd_export *exp, const struct lu_fid *fid)
1422 {
1423         struct obd_device *obd = exp->exp_obd;
1424         struct lmv_obd *lmv = &obd->u.lmv;
1425         struct lu_tgt_desc *tgt;
1426
1427         ENTRY;
1428
1429         CDEBUG(D_INODE, "CBDATA for "DFID"\n", PFID(fid));
1430
1431         /*
1432          * With DNE every object can have two locks in different namespaces:
1433          * lookup lock in space of MDT storing direntry and update/open lock in
1434          * space of MDT storing inode.
1435          */
1436         lmv_foreach_connected_tgt(lmv, tgt)
1437                 md_null_inode(tgt->ltd_exp, fid);
1438
1439         RETURN(0);
1440 }
1441
1442 static int lmv_close(struct obd_export *exp, struct md_op_data *op_data,
1443                      struct md_open_data *mod, struct ptlrpc_request **request)
1444 {
1445         struct obd_device *obd = exp->exp_obd;
1446         struct lmv_obd *lmv = &obd->u.lmv;
1447         struct lmv_tgt_desc *tgt;
1448         int rc;
1449
1450         ENTRY;
1451
1452         tgt = lmv_fid2tgt(lmv, &op_data->op_fid1);
1453         if (IS_ERR(tgt))
1454                 RETURN(PTR_ERR(tgt));
1455
1456         CDEBUG(D_INODE, "CLOSE "DFID"\n", PFID(&op_data->op_fid1));
1457         rc = md_close(tgt->ltd_exp, op_data, mod, request);
1458         RETURN(rc);
1459 }
1460
1461 static struct lu_tgt_desc *lmv_locate_tgt_qos(struct lmv_obd *lmv, __u32 *mdt)
1462 {
1463         struct lu_tgt_desc *tgt;
1464         __u64 total_weight = 0;
1465         __u64 cur_weight = 0;
1466         __u64 rand;
1467         int rc;
1468
1469         ENTRY;
1470
1471         if (!ltd_qos_is_usable(&lmv->lmv_mdt_descs))
1472                 RETURN(ERR_PTR(-EAGAIN));
1473
1474         down_write(&lmv->lmv_qos.lq_rw_sem);
1475
1476         if (!ltd_qos_is_usable(&lmv->lmv_mdt_descs))
1477                 GOTO(unlock, tgt = ERR_PTR(-EAGAIN));
1478
1479         rc = ltd_qos_penalties_calc(&lmv->lmv_mdt_descs);
1480         if (rc)
1481                 GOTO(unlock, tgt = ERR_PTR(rc));
1482
1483         lmv_foreach_tgt(lmv, tgt) {
1484                 tgt->ltd_qos.ltq_usable = 0;
1485                 if (!tgt->ltd_exp || !tgt->ltd_active)
1486                         continue;
1487
1488                 tgt->ltd_qos.ltq_usable = 1;
1489                 lu_tgt_qos_weight_calc(tgt);
1490                 total_weight += tgt->ltd_qos.ltq_weight;
1491         }
1492
1493         rand = lu_prandom_u64_max(total_weight);
1494
1495         lmv_foreach_connected_tgt(lmv, tgt) {
1496                 if (!tgt->ltd_qos.ltq_usable)
1497                         continue;
1498
1499                 cur_weight += tgt->ltd_qos.ltq_weight;
1500                 if (cur_weight < rand)
1501                         continue;
1502
1503                 *mdt = tgt->ltd_index;
1504                 ltd_qos_update(&lmv->lmv_mdt_descs, tgt, &total_weight);
1505                 GOTO(unlock, rc = 0);
1506         }
1507
1508         /* no proper target found */
1509         GOTO(unlock, tgt = ERR_PTR(-EAGAIN));
1510 unlock:
1511         up_write(&lmv->lmv_qos.lq_rw_sem);
1512
1513         return tgt;
1514 }
1515
1516 static struct lu_tgt_desc *lmv_locate_tgt_rr(struct lmv_obd *lmv, __u32 *mdt)
1517 {
1518         struct lu_tgt_desc *tgt;
1519         int i;
1520         int index;
1521
1522         ENTRY;
1523
1524         spin_lock(&lmv->lmv_qos.lq_rr.lqr_alloc);
1525         for (i = 0; i < lmv->lmv_mdt_descs.ltd_tgts_size; i++) {
1526                 index = (i + lmv->lmv_qos_rr_index) %
1527                         lmv->lmv_mdt_descs.ltd_tgts_size;
1528                 tgt = lmv_tgt(lmv, index);
1529                 if (!tgt || !tgt->ltd_exp || !tgt->ltd_active)
1530                         continue;
1531
1532                 *mdt = tgt->ltd_index;
1533                 lmv->lmv_qos_rr_index = (*mdt + 1) %
1534                                         lmv->lmv_mdt_descs.ltd_tgts_size;
1535                 spin_unlock(&lmv->lmv_qos.lq_rr.lqr_alloc);
1536
1537                 RETURN(tgt);
1538         }
1539         spin_unlock(&lmv->lmv_qos.lq_rr.lqr_alloc);
1540
1541         RETURN(ERR_PTR(-ENODEV));
1542 }
1543
1544 static struct lmv_tgt_desc *
1545 lmv_locate_tgt_by_name(struct lmv_obd *lmv, struct lmv_stripe_md *lsm,
1546                        const char *name, int namelen, struct lu_fid *fid,
1547                        __u32 *mds, bool post_migrate)
1548 {
1549         struct lmv_tgt_desc *tgt;
1550         const struct lmv_oinfo *oinfo;
1551
1552         if (!lmv_dir_striped(lsm) || !namelen) {
1553                 tgt = lmv_fid2tgt(lmv, fid);
1554                 if (IS_ERR(tgt))
1555                         return tgt;
1556
1557                 *mds = tgt->ltd_index;
1558                 return tgt;
1559         }
1560
1561         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_BAD_NAME_HASH)) {
1562                 if (cfs_fail_val >= lsm->lsm_md_stripe_count)
1563                         return ERR_PTR(-EBADF);
1564                 oinfo = &lsm->lsm_md_oinfo[cfs_fail_val];
1565         } else {
1566                 oinfo = lsm_name_to_stripe_info(lsm, name, namelen,
1567                                                 post_migrate);
1568                 if (IS_ERR(oinfo))
1569                         return ERR_CAST(oinfo);
1570         }
1571
1572         *fid = oinfo->lmo_fid;
1573         *mds = oinfo->lmo_mds;
1574         tgt = lmv_tgt(lmv, oinfo->lmo_mds);
1575
1576         CDEBUG(D_INODE, "locate MDT %u parent "DFID"\n", *mds, PFID(fid));
1577
1578         return tgt ? tgt : ERR_PTR(-ENODEV);
1579 }
1580
1581 /**
1582  * Locate MDT of op_data->op_fid1
1583  *
1584  * For striped directory, it will locate the stripe by name hash, if hash_type
1585  * is unknown, it will return the stripe specified by 'op_data->op_stripe_index'
1586  * which is set outside, and if dir is migrating, 'op_data->op_post_migrate'
1587  * indicates whether old or new layout is used to locate.
1588  *
1589  * For plain direcotry, it just locate the MDT of op_data->op_fid1.
1590  *
1591  * \param[in] lmv       LMV device
1592  * \param[in] op_data   client MD stack parameters, name, namelen
1593  *                      mds_num etc.
1594  *
1595  * retval               pointer to the lmv_tgt_desc if succeed.
1596  *                      ERR_PTR(errno) if failed.
1597  */
1598 struct lmv_tgt_desc *
1599 lmv_locate_tgt(struct lmv_obd *lmv, struct md_op_data *op_data)
1600 {
1601         struct lmv_stripe_md *lsm = op_data->op_mea1;
1602         struct lmv_oinfo *oinfo;
1603         struct lmv_tgt_desc *tgt;
1604
1605         if (lmv_dir_foreign(lsm))
1606                 return ERR_PTR(-ENODATA);
1607
1608         /* During creating VOLATILE file, it should honor the mdt
1609          * index if the file under striped dir is being restored, see
1610          * ct_restore(). */
1611         if (op_data->op_bias & MDS_CREATE_VOLATILE &&
1612             op_data->op_mds != LMV_OFFSET_DEFAULT) {
1613                 tgt = lmv_tgt(lmv, op_data->op_mds);
1614                 if (!tgt)
1615                         return ERR_PTR(-ENODEV);
1616
1617                 if (lmv_dir_striped(lsm)) {
1618                         int i;
1619
1620                         /* refill the right parent fid */
1621                         for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
1622                                 oinfo = &lsm->lsm_md_oinfo[i];
1623                                 if (oinfo->lmo_mds == op_data->op_mds) {
1624                                         op_data->op_fid1 = oinfo->lmo_fid;
1625                                         break;
1626                                 }
1627                         }
1628
1629                         if (i == lsm->lsm_md_stripe_count)
1630                                 op_data->op_fid1 = lsm->lsm_md_oinfo[0].lmo_fid;
1631                 }
1632         } else if (lmv_dir_bad_hash(lsm)) {
1633                 LASSERT(op_data->op_stripe_index < lsm->lsm_md_stripe_count);
1634                 oinfo = &lsm->lsm_md_oinfo[op_data->op_stripe_index];
1635
1636                 op_data->op_fid1 = oinfo->lmo_fid;
1637                 op_data->op_mds = oinfo->lmo_mds;
1638                 tgt = lmv_tgt(lmv, oinfo->lmo_mds);
1639                 if (!tgt)
1640                         return ERR_PTR(-ENODEV);
1641         } else {
1642                 tgt = lmv_locate_tgt_by_name(lmv, op_data->op_mea1,
1643                                 op_data->op_name, op_data->op_namelen,
1644                                 &op_data->op_fid1, &op_data->op_mds,
1645                                 op_data->op_post_migrate);
1646         }
1647
1648         return tgt;
1649 }
1650
1651 /* Locate MDT of op_data->op_fid2 for link/rename */
1652 static struct lmv_tgt_desc *
1653 lmv_locate_tgt2(struct lmv_obd *lmv, struct md_op_data *op_data)
1654 {
1655         struct lmv_tgt_desc *tgt;
1656         int rc;
1657
1658         LASSERT(op_data->op_name);
1659         if (lmv_dir_migrating(op_data->op_mea2)) {
1660                 struct lu_fid fid1 = op_data->op_fid1;
1661                 struct lmv_stripe_md *lsm1 = op_data->op_mea1;
1662                 struct ptlrpc_request *request = NULL;
1663
1664                 /*
1665                  * avoid creating new file under old layout of migrating
1666                  * directory, check it here.
1667                  */
1668                 tgt = lmv_locate_tgt_by_name(lmv, op_data->op_mea2,
1669                                 op_data->op_name, op_data->op_namelen,
1670                                 &op_data->op_fid2, &op_data->op_mds, false);
1671                 if (IS_ERR(tgt))
1672                         RETURN(tgt);
1673
1674                 op_data->op_fid1 = op_data->op_fid2;
1675                 op_data->op_mea1 = op_data->op_mea2;
1676                 rc = md_getattr_name(tgt->ltd_exp, op_data, &request);
1677                 op_data->op_fid1 = fid1;
1678                 op_data->op_mea1 = lsm1;
1679                 if (!rc) {
1680                         ptlrpc_req_finished(request);
1681                         RETURN(ERR_PTR(-EEXIST));
1682                 }
1683
1684                 if (rc != -ENOENT)
1685                         RETURN(ERR_PTR(rc));
1686         }
1687
1688         return lmv_locate_tgt_by_name(lmv, op_data->op_mea2, op_data->op_name,
1689                                 op_data->op_namelen, &op_data->op_fid2,
1690                                 &op_data->op_mds, true);
1691 }
1692
1693 int lmv_migrate_existence_check(struct lmv_obd *lmv, struct md_op_data *op_data)
1694 {
1695         struct lu_tgt_desc *tgt;
1696         struct ptlrpc_request *request;
1697         int rc;
1698
1699         LASSERT(lmv_dir_migrating(op_data->op_mea1));
1700
1701         tgt = lmv_locate_tgt(lmv, op_data);
1702         if (IS_ERR(tgt))
1703                 return PTR_ERR(tgt);
1704
1705         rc = md_getattr_name(tgt->ltd_exp, op_data, &request);
1706         if (!rc) {
1707                 ptlrpc_req_finished(request);
1708                 return -EEXIST;
1709         }
1710
1711         return rc;
1712 }
1713
1714 /* mkdir by QoS in two cases:
1715  * 1. 'lfs mkdir -i -1'
1716  * 2. parent default LMV master_mdt_index is -1
1717  *
1718  * NB, mkdir by QoS only if parent is not striped, this is to avoid remote
1719  * directories under striped directory.
1720  */
1721 static inline bool lmv_op_qos_mkdir(const struct md_op_data *op_data)
1722 {
1723         const struct lmv_stripe_md *lsm = op_data->op_default_mea1;
1724         const struct lmv_user_md *lum = op_data->op_data;
1725
1726         if (op_data->op_code != LUSTRE_OPC_MKDIR)
1727                 return false;
1728
1729         if (lmv_dir_striped(op_data->op_mea1))
1730                 return false;
1731
1732         if (op_data->op_cli_flags & CLI_SET_MEA && lum &&
1733             (le32_to_cpu(lum->lum_magic) == LMV_USER_MAGIC ||
1734              le32_to_cpu(lum->lum_magic) == LMV_USER_MAGIC_SPECIFIC) &&
1735             le32_to_cpu(lum->lum_stripe_offset) == LMV_OFFSET_DEFAULT)
1736                 return true;
1737
1738         if (lsm && lsm->lsm_md_master_mdt_index == LMV_OFFSET_DEFAULT)
1739                 return true;
1740
1741         return false;
1742 }
1743
1744 /* 'lfs mkdir -i <specific_MDT>' */
1745 static inline bool lmv_op_user_specific_mkdir(const struct md_op_data *op_data)
1746 {
1747         const struct lmv_user_md *lum = op_data->op_data;
1748
1749         return op_data->op_code == LUSTRE_OPC_MKDIR &&
1750                op_data->op_cli_flags & CLI_SET_MEA && lum &&
1751                (le32_to_cpu(lum->lum_magic) == LMV_USER_MAGIC ||
1752                 le32_to_cpu(lum->lum_magic) == LMV_USER_MAGIC_SPECIFIC) &&
1753                le32_to_cpu(lum->lum_stripe_offset) != LMV_OFFSET_DEFAULT;
1754 }
1755
1756 /* parent default LMV master_mdt_index is not -1. */
1757 static inline bool
1758 lmv_op_default_specific_mkdir(const struct md_op_data *op_data)
1759 {
1760         return op_data->op_code == LUSTRE_OPC_MKDIR &&
1761                op_data->op_default_mea1 &&
1762                op_data->op_default_mea1->lsm_md_master_mdt_index !=
1763                         LMV_OFFSET_DEFAULT;
1764 }
1765 int lmv_create(struct obd_export *exp, struct md_op_data *op_data,
1766                 const void *data, size_t datalen, umode_t mode, uid_t uid,
1767                 gid_t gid, cfs_cap_t cap_effective, __u64 rdev,
1768                 struct ptlrpc_request **request)
1769 {
1770         struct obd_device *obd = exp->exp_obd;
1771         struct lmv_obd *lmv = &obd->u.lmv;
1772         struct lmv_tgt_desc *tgt;
1773         int rc;
1774
1775         ENTRY;
1776
1777         if (!lmv->lmv_mdt_descs.ltd_lmv_desc.ld_active_tgt_count)
1778                 RETURN(-EIO);
1779
1780         if (lmv_dir_bad_hash(op_data->op_mea1))
1781                 RETURN(-EBADF);
1782
1783         if (lmv_dir_migrating(op_data->op_mea1)) {
1784                 /*
1785                  * if parent is migrating, create() needs to lookup existing
1786                  * name in both old and new layout, check old layout on client.
1787                  */
1788                 rc = lmv_migrate_existence_check(lmv, op_data);
1789                 if (rc != -ENOENT)
1790                         RETURN(rc);
1791
1792                 op_data->op_post_migrate = true;
1793         }
1794
1795         tgt = lmv_locate_tgt(lmv, op_data);
1796         if (IS_ERR(tgt))
1797                 RETURN(PTR_ERR(tgt));
1798
1799         if (lmv_op_qos_mkdir(op_data)) {
1800                 tgt = lmv_locate_tgt_qos(lmv, &op_data->op_mds);
1801                 if (tgt == ERR_PTR(-EAGAIN))
1802                         tgt = lmv_locate_tgt_rr(lmv, &op_data->op_mds);
1803                 /*
1804                  * only update statfs after QoS mkdir, this means the cached
1805                  * statfs may be stale, and current mkdir may not follow QoS
1806                  * accurately, but it's not serious, and avoids periodic statfs
1807                  * when client doesn't mkdir by QoS.
1808                  */
1809                 if (!IS_ERR(tgt))
1810                         lmv_statfs_check_update(obd, tgt);
1811         } else if (lmv_op_user_specific_mkdir(op_data)) {
1812                 struct lmv_user_md *lum = op_data->op_data;
1813
1814                 op_data->op_mds = le32_to_cpu(lum->lum_stripe_offset);
1815                 tgt = lmv_tgt(lmv, op_data->op_mds);
1816                 if (!tgt)
1817                         RETURN(-ENODEV);
1818         } else if (lmv_op_default_specific_mkdir(op_data)) {
1819                 op_data->op_mds =
1820                         op_data->op_default_mea1->lsm_md_master_mdt_index;
1821                 tgt = lmv_tgt(lmv, op_data->op_mds);
1822                 if (!tgt)
1823                         RETURN(-ENODEV);
1824         }
1825
1826         if (IS_ERR(tgt))
1827                 RETURN(PTR_ERR(tgt));
1828
1829         rc = lmv_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
1830         if (rc)
1831                 RETURN(rc);
1832
1833         CDEBUG(D_INODE, "CREATE name '%.*s' "DFID" on "DFID" -> mds #%x\n",
1834                 (int)op_data->op_namelen, op_data->op_name,
1835                 PFID(&op_data->op_fid2), PFID(&op_data->op_fid1),
1836                 op_data->op_mds);
1837
1838         op_data->op_flags |= MF_MDC_CANCEL_FID1;
1839         rc = md_create(tgt->ltd_exp, op_data, data, datalen, mode, uid, gid,
1840                        cap_effective, rdev, request);
1841         if (rc == 0) {
1842                 if (*request == NULL)
1843                         RETURN(rc);
1844                 CDEBUG(D_INODE, "Created - "DFID"\n", PFID(&op_data->op_fid2));
1845         }
1846         RETURN(rc);
1847 }
1848
1849 static int
1850 lmv_enqueue(struct obd_export *exp, struct ldlm_enqueue_info *einfo,
1851             const union ldlm_policy_data *policy, struct md_op_data *op_data,
1852             struct lustre_handle *lockh, __u64 extra_lock_flags)
1853 {
1854         struct obd_device *obd = exp->exp_obd;
1855         struct lmv_obd *lmv = &obd->u.lmv;
1856         struct lmv_tgt_desc *tgt;
1857         int rc;
1858
1859         ENTRY;
1860
1861         CDEBUG(D_INODE, "ENQUEUE on "DFID"\n", PFID(&op_data->op_fid1));
1862
1863         tgt = lmv_fid2tgt(lmv, &op_data->op_fid1);
1864         if (IS_ERR(tgt))
1865                 RETURN(PTR_ERR(tgt));
1866
1867         CDEBUG(D_INODE, "ENQUEUE on "DFID" -> mds #%u\n",
1868                PFID(&op_data->op_fid1), tgt->ltd_index);
1869
1870         rc = md_enqueue(tgt->ltd_exp, einfo, policy, op_data, lockh,
1871                         extra_lock_flags);
1872
1873         RETURN(rc);
1874 }
1875
1876 int
1877 lmv_getattr_name(struct obd_export *exp,struct md_op_data *op_data,
1878                  struct ptlrpc_request **preq)
1879 {
1880         struct obd_device *obd = exp->exp_obd;
1881         struct lmv_obd *lmv = &obd->u.lmv;
1882         struct lmv_tgt_desc *tgt;
1883         struct mdt_body *body;
1884         int rc;
1885
1886         ENTRY;
1887
1888 retry:
1889         tgt = lmv_locate_tgt(lmv, op_data);
1890         if (IS_ERR(tgt))
1891                 RETURN(PTR_ERR(tgt));
1892
1893         CDEBUG(D_INODE, "GETATTR_NAME for %*s on "DFID" -> mds #%d\n",
1894                 (int)op_data->op_namelen, op_data->op_name,
1895                 PFID(&op_data->op_fid1), tgt->ltd_index);
1896
1897         rc = md_getattr_name(tgt->ltd_exp, op_data, preq);
1898         if (rc == -ENOENT && lmv_dir_retry_check_update(op_data)) {
1899                 ptlrpc_req_finished(*preq);
1900                 *preq = NULL;
1901                 goto retry;
1902         }
1903
1904         if (rc)
1905                 RETURN(rc);
1906
1907         body = req_capsule_server_get(&(*preq)->rq_pill, &RMF_MDT_BODY);
1908         LASSERT(body != NULL);
1909
1910         if (body->mbo_valid & OBD_MD_MDS) {
1911                 op_data->op_fid1 = body->mbo_fid1;
1912                 op_data->op_valid |= OBD_MD_FLCROSSREF;
1913                 op_data->op_namelen = 0;
1914                 op_data->op_name = NULL;
1915
1916                 ptlrpc_req_finished(*preq);
1917                 *preq = NULL;
1918
1919                 goto retry;
1920         }
1921
1922         RETURN(rc);
1923 }
1924
1925 #define md_op_data_fid(op_data, fl)                     \
1926         (fl == MF_MDC_CANCEL_FID1 ? &op_data->op_fid1 : \
1927          fl == MF_MDC_CANCEL_FID2 ? &op_data->op_fid2 : \
1928          fl == MF_MDC_CANCEL_FID3 ? &op_data->op_fid3 : \
1929          fl == MF_MDC_CANCEL_FID4 ? &op_data->op_fid4 : \
1930          NULL)
1931
1932 static int lmv_early_cancel(struct obd_export *exp, struct lmv_tgt_desc *tgt,
1933                             struct md_op_data *op_data, __u32 op_tgt,
1934                             enum ldlm_mode mode, int bits, int flag)
1935 {
1936         struct lu_fid *fid = md_op_data_fid(op_data, flag);
1937         struct lmv_obd *lmv = &exp->exp_obd->u.lmv;
1938         union ldlm_policy_data policy = { { 0 } };
1939         int rc = 0;
1940         ENTRY;
1941
1942         if (!fid_is_sane(fid))
1943                 RETURN(0);
1944
1945         if (tgt == NULL) {
1946                 tgt = lmv_fid2tgt(lmv, fid);
1947                 if (IS_ERR(tgt))
1948                         RETURN(PTR_ERR(tgt));
1949         }
1950
1951         if (tgt->ltd_index != op_tgt) {
1952                 CDEBUG(D_INODE, "EARLY_CANCEL on "DFID"\n", PFID(fid));
1953                 policy.l_inodebits.bits = bits;
1954                 rc = md_cancel_unused(tgt->ltd_exp, fid, &policy,
1955                                       mode, LCF_ASYNC, NULL);
1956         } else {
1957                 CDEBUG(D_INODE,
1958                        "EARLY_CANCEL skip operation target %d on "DFID"\n",
1959                        op_tgt, PFID(fid));
1960                 op_data->op_flags |= flag;
1961                 rc = 0;
1962         }
1963
1964         RETURN(rc);
1965 }
1966
1967 /*
1968  * llite passes fid of an target inode in op_data->op_fid1 and id of directory in
1969  * op_data->op_fid2
1970  */
1971 static int lmv_link(struct obd_export *exp, struct md_op_data *op_data,
1972                     struct ptlrpc_request **request)
1973 {
1974         struct obd_device       *obd = exp->exp_obd;
1975         struct lmv_obd          *lmv = &obd->u.lmv;
1976         struct lmv_tgt_desc     *tgt;
1977         int                      rc;
1978         ENTRY;
1979
1980         LASSERT(op_data->op_namelen != 0);
1981
1982         CDEBUG(D_INODE, "LINK "DFID":%*s to "DFID"\n",
1983                PFID(&op_data->op_fid2), (int)op_data->op_namelen,
1984                op_data->op_name, PFID(&op_data->op_fid1));
1985
1986         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
1987         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
1988         op_data->op_cap = cfs_curproc_cap_pack();
1989
1990         tgt = lmv_locate_tgt2(lmv, op_data);
1991         if (IS_ERR(tgt))
1992                 RETURN(PTR_ERR(tgt));
1993
1994         /*
1995          * Cancel UPDATE lock on child (fid1).
1996          */
1997         op_data->op_flags |= MF_MDC_CANCEL_FID2;
1998         rc = lmv_early_cancel(exp, NULL, op_data, tgt->ltd_index, LCK_EX,
1999                               MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID1);
2000         if (rc != 0)
2001                 RETURN(rc);
2002
2003         rc = md_link(tgt->ltd_exp, op_data, request);
2004
2005         RETURN(rc);
2006 }
2007
2008 static int lmv_migrate(struct obd_export *exp, struct md_op_data *op_data,
2009                         const char *name, size_t namelen,
2010                         struct ptlrpc_request **request)
2011 {
2012         struct obd_device *obd = exp->exp_obd;
2013         struct lmv_obd *lmv = &obd->u.lmv;
2014         struct lmv_stripe_md *lsm = op_data->op_mea1;
2015         struct lmv_tgt_desc *parent_tgt;
2016         struct lmv_tgt_desc *sp_tgt;
2017         struct lmv_tgt_desc *tp_tgt = NULL;
2018         struct lmv_tgt_desc *child_tgt;
2019         struct lmv_tgt_desc *tgt;
2020         struct lu_fid target_fid;
2021         int rc;
2022
2023         ENTRY;
2024
2025         LASSERT(op_data->op_cli_flags & CLI_MIGRATE);
2026
2027         CDEBUG(D_INODE, "MIGRATE "DFID"/%.*s\n",
2028                PFID(&op_data->op_fid1), (int)namelen, name);
2029
2030         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2031         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2032         op_data->op_cap = cfs_curproc_cap_pack();
2033
2034         parent_tgt = lmv_fid2tgt(lmv, &op_data->op_fid1);
2035         if (IS_ERR(parent_tgt))
2036                 RETURN(PTR_ERR(parent_tgt));
2037
2038         if (lmv_dir_striped(lsm)) {
2039                 __u32 hash_type = lsm->lsm_md_hash_type;
2040                 __u32 stripe_count = lsm->lsm_md_stripe_count;
2041
2042                 /*
2043                  * old stripes are appended after new stripes for migrating
2044                  * directory.
2045                  */
2046                 if (lmv_dir_migrating(lsm)) {
2047                         hash_type = lsm->lsm_md_migrate_hash;
2048                         stripe_count -= lsm->lsm_md_migrate_offset;
2049                 }
2050
2051                 rc = lmv_name_to_stripe_index(hash_type, stripe_count, name,
2052                                               namelen);
2053                 if (rc < 0)
2054                         RETURN(rc);
2055
2056                 if (lmv_dir_migrating(lsm))
2057                         rc += lsm->lsm_md_migrate_offset;
2058
2059                 /* save it in fid4 temporarily for early cancel */
2060                 op_data->op_fid4 = lsm->lsm_md_oinfo[rc].lmo_fid;
2061                 sp_tgt = lmv_tgt(lmv, lsm->lsm_md_oinfo[rc].lmo_mds);
2062                 if (!sp_tgt)
2063                         RETURN(-ENODEV);
2064
2065                 /*
2066                  * if parent is being migrated too, fill op_fid2 with target
2067                  * stripe fid, otherwise the target stripe is not created yet.
2068                  */
2069                 if (lmv_dir_migrating(lsm)) {
2070                         hash_type = lsm->lsm_md_hash_type &
2071                                     ~LMV_HASH_FLAG_MIGRATION;
2072                         stripe_count = lsm->lsm_md_migrate_offset;
2073
2074                         rc = lmv_name_to_stripe_index(hash_type, stripe_count,
2075                                                       name, namelen);
2076                         if (rc < 0)
2077                                 RETURN(rc);
2078
2079                         op_data->op_fid2 = lsm->lsm_md_oinfo[rc].lmo_fid;
2080                         tp_tgt = lmv_tgt(lmv, lsm->lsm_md_oinfo[rc].lmo_mds);
2081                         if (!tp_tgt)
2082                                 RETURN(-ENODEV);
2083                 }
2084         } else {
2085                 sp_tgt = parent_tgt;
2086         }
2087
2088         child_tgt = lmv_fid2tgt(lmv, &op_data->op_fid3);
2089         if (IS_ERR(child_tgt))
2090                 RETURN(PTR_ERR(child_tgt));
2091
2092         /* for directory, migrate to MDT specified by lum_stripe_offset;
2093          * otherwise migrate to the target stripe of parent, but parent
2094          * directory may have finished migration (normally current file too),
2095          * allocate FID on MDT lum_stripe_offset, and server will check
2096          * whether file was migrated already.
2097          */
2098         if (S_ISDIR(op_data->op_mode) || !tp_tgt) {
2099                 struct lmv_user_md *lum = op_data->op_data;
2100
2101                 op_data->op_mds = le32_to_cpu(lum->lum_stripe_offset);
2102         } else  {
2103                 op_data->op_mds = tp_tgt->ltd_index;
2104         }
2105         rc = lmv_fid_alloc(NULL, exp, &target_fid, op_data);
2106         if (rc)
2107                 RETURN(rc);
2108
2109         /*
2110          * for directory, send migrate request to the MDT where the object will
2111          * be migrated to, because we can't create a striped directory remotely.
2112          *
2113          * otherwise, send to the MDT where source is located because regular
2114          * file may open lease.
2115          *
2116          * NB. if MDT doesn't support DIR_MIGRATE, send to source MDT too for
2117          * backward compatibility.
2118          */
2119         if (S_ISDIR(op_data->op_mode) &&
2120             (exp_connect_flags2(exp) & OBD_CONNECT2_DIR_MIGRATE)) {
2121                 tgt = lmv_fid2tgt(lmv, &target_fid);
2122                 if (IS_ERR(tgt))
2123                         RETURN(PTR_ERR(tgt));
2124         } else {
2125                 tgt = child_tgt;
2126         }
2127
2128         /* cancel UPDATE lock of parent master object */
2129         rc = lmv_early_cancel(exp, parent_tgt, op_data, tgt->ltd_index, LCK_EX,
2130                               MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID1);
2131         if (rc)
2132                 RETURN(rc);
2133
2134         /* cancel UPDATE lock of source parent */
2135         if (sp_tgt != parent_tgt) {
2136                 /*
2137                  * migrate RPC packs master object FID, because we can only pack
2138                  * two FIDs in reint RPC, but MDS needs to know both source
2139                  * parent and target parent, and it will obtain them from master
2140                  * FID and LMV, the other FID in RPC is kept for target.
2141                  *
2142                  * since this FID is not passed to MDC, cancel it anyway.
2143                  */
2144                 rc = lmv_early_cancel(exp, sp_tgt, op_data, -1, LCK_EX,
2145                                       MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID4);
2146                 if (rc)
2147                         RETURN(rc);
2148
2149                 op_data->op_flags &= ~MF_MDC_CANCEL_FID4;
2150         }
2151         op_data->op_fid4 = target_fid;
2152
2153         /* cancel UPDATE locks of target parent */
2154         rc = lmv_early_cancel(exp, tp_tgt, op_data, tgt->ltd_index, LCK_EX,
2155                               MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID2);
2156         if (rc)
2157                 RETURN(rc);
2158
2159         /* cancel LOOKUP lock of source if source is remote object */
2160         if (child_tgt != sp_tgt) {
2161                 rc = lmv_early_cancel(exp, sp_tgt, op_data, tgt->ltd_index,
2162                                       LCK_EX, MDS_INODELOCK_LOOKUP,
2163                                       MF_MDC_CANCEL_FID3);
2164                 if (rc)
2165                         RETURN(rc);
2166         }
2167
2168         /* cancel ELC locks of source */
2169         rc = lmv_early_cancel(exp, child_tgt, op_data, tgt->ltd_index, LCK_EX,
2170                               MDS_INODELOCK_ELC, MF_MDC_CANCEL_FID3);
2171         if (rc)
2172                 RETURN(rc);
2173
2174         rc = md_rename(tgt->ltd_exp, op_data, name, namelen, NULL, 0, request);
2175
2176         RETURN(rc);
2177 }
2178
2179 static int lmv_rename(struct obd_export *exp, struct md_op_data *op_data,
2180                       const char *old, size_t oldlen,
2181                       const char *new, size_t newlen,
2182                       struct ptlrpc_request **request)
2183 {
2184         struct obd_device *obd = exp->exp_obd;
2185         struct lmv_obd *lmv = &obd->u.lmv;
2186         struct lmv_tgt_desc *sp_tgt;
2187         struct lmv_tgt_desc *tp_tgt = NULL;
2188         struct lmv_tgt_desc *src_tgt = NULL;
2189         struct lmv_tgt_desc *tgt;
2190         struct mdt_body *body;
2191         int rc;
2192
2193         ENTRY;
2194
2195         LASSERT(oldlen != 0);
2196
2197         if (op_data->op_cli_flags & CLI_MIGRATE) {
2198                 rc = lmv_migrate(exp, op_data, old, oldlen, request);
2199                 RETURN(rc);
2200         }
2201
2202         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2203         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2204         op_data->op_cap = cfs_curproc_cap_pack();
2205
2206         op_data->op_name = new;
2207         op_data->op_namelen = newlen;
2208
2209         tp_tgt = lmv_locate_tgt2(lmv, op_data);
2210         if (IS_ERR(tp_tgt))
2211                 RETURN(PTR_ERR(tp_tgt));
2212
2213         /* Since the target child might be destroyed, and it might become
2214          * orphan, and we can only check orphan on the local MDT right now, so
2215          * we send rename request to the MDT where target child is located. If
2216          * target child does not exist, then it will send the request to the
2217          * target parent */
2218         if (fid_is_sane(&op_data->op_fid4)) {
2219                 tgt = lmv_fid2tgt(lmv, &op_data->op_fid4);
2220                 if (IS_ERR(tgt))
2221                         RETURN(PTR_ERR(tgt));
2222         } else {
2223                 tgt = tp_tgt;
2224         }
2225
2226         op_data->op_flags |= MF_MDC_CANCEL_FID4;
2227
2228         /* cancel UPDATE locks of target parent */
2229         rc = lmv_early_cancel(exp, tp_tgt, op_data, tgt->ltd_index, LCK_EX,
2230                               MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID2);
2231         if (rc != 0)
2232                 RETURN(rc);
2233
2234         if (fid_is_sane(&op_data->op_fid4)) {
2235                 /* cancel LOOKUP lock of target on target parent */
2236                 if (tgt != tp_tgt) {
2237                         rc = lmv_early_cancel(exp, tp_tgt, op_data,
2238                                               tgt->ltd_index, LCK_EX,
2239                                               MDS_INODELOCK_LOOKUP,
2240                                               MF_MDC_CANCEL_FID4);
2241                         if (rc != 0)
2242                                 RETURN(rc);
2243                 }
2244         }
2245
2246         if (fid_is_sane(&op_data->op_fid3)) {
2247                 src_tgt = lmv_fid2tgt(lmv, &op_data->op_fid3);
2248                 if (IS_ERR(src_tgt))
2249                         RETURN(PTR_ERR(src_tgt));
2250
2251                 /* cancel ELC locks of source */
2252                 rc = lmv_early_cancel(exp, src_tgt, op_data, tgt->ltd_index,
2253                                       LCK_EX, MDS_INODELOCK_ELC,
2254                                       MF_MDC_CANCEL_FID3);
2255                 if (rc != 0)
2256                         RETURN(rc);
2257         }
2258
2259         op_data->op_name = old;
2260         op_data->op_namelen = oldlen;
2261 retry:
2262         sp_tgt = lmv_locate_tgt(lmv, op_data);
2263         if (IS_ERR(sp_tgt))
2264                 RETURN(PTR_ERR(sp_tgt));
2265
2266         /* cancel UPDATE locks of source parent */
2267         rc = lmv_early_cancel(exp, sp_tgt, op_data, tgt->ltd_index, LCK_EX,
2268                               MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID1);
2269         if (rc != 0)
2270                 RETURN(rc);
2271
2272         if (fid_is_sane(&op_data->op_fid3)) {
2273                 /* cancel LOOKUP lock of source on source parent */
2274                 if (src_tgt != sp_tgt) {
2275                         rc = lmv_early_cancel(exp, sp_tgt, op_data,
2276                                               tgt->ltd_index, LCK_EX,
2277                                               MDS_INODELOCK_LOOKUP,
2278                                               MF_MDC_CANCEL_FID3);
2279                         if (rc != 0)
2280                                 RETURN(rc);
2281                 }
2282         }
2283
2284 rename:
2285         CDEBUG(D_INODE, "RENAME "DFID"/%.*s to "DFID"/%.*s\n",
2286                 PFID(&op_data->op_fid1), (int)oldlen, old,
2287                 PFID(&op_data->op_fid2), (int)newlen, new);
2288
2289         rc = md_rename(tgt->ltd_exp, op_data, old, oldlen, new, newlen,
2290                         request);
2291         if (rc == -ENOENT && lmv_dir_retry_check_update(op_data)) {
2292                 ptlrpc_req_finished(*request);
2293                 *request = NULL;
2294                 goto retry;
2295         }
2296
2297         if (rc && rc != -EXDEV)
2298                 RETURN(rc);
2299
2300         body = req_capsule_server_get(&(*request)->rq_pill, &RMF_MDT_BODY);
2301         if (body == NULL)
2302                 RETURN(-EPROTO);
2303
2304         /* Not cross-ref case, just get out of here. */
2305         if (likely(!(body->mbo_valid & OBD_MD_MDS)))
2306                 RETURN(rc);
2307
2308         op_data->op_fid4 = body->mbo_fid1;
2309
2310         ptlrpc_req_finished(*request);
2311         *request = NULL;
2312
2313         tgt = lmv_fid2tgt(lmv, &op_data->op_fid4);
2314         if (IS_ERR(tgt))
2315                 RETURN(PTR_ERR(tgt));
2316
2317         if (fid_is_sane(&op_data->op_fid4)) {
2318                 /* cancel LOOKUP lock of target on target parent */
2319                 if (tgt != tp_tgt) {
2320                         rc = lmv_early_cancel(exp, tp_tgt, op_data,
2321                                               tgt->ltd_index, LCK_EX,
2322                                               MDS_INODELOCK_LOOKUP,
2323                                               MF_MDC_CANCEL_FID4);
2324                         if (rc != 0)
2325                                 RETURN(rc);
2326                 }
2327         }
2328
2329         goto rename;
2330 }
2331
2332 static int lmv_setattr(struct obd_export *exp, struct md_op_data *op_data,
2333                        void *ea, size_t ealen, struct ptlrpc_request **request)
2334 {
2335         struct obd_device *obd = exp->exp_obd;
2336         struct lmv_obd *lmv = &obd->u.lmv;
2337         struct lmv_tgt_desc *tgt;
2338         int rc = 0;
2339
2340         ENTRY;
2341
2342         CDEBUG(D_INODE, "SETATTR for "DFID", valid 0x%x/0x%x\n",
2343                PFID(&op_data->op_fid1), op_data->op_attr.ia_valid,
2344                op_data->op_xvalid);
2345
2346         op_data->op_flags |= MF_MDC_CANCEL_FID1;
2347         tgt = lmv_fid2tgt(lmv, &op_data->op_fid1);
2348         if (IS_ERR(tgt))
2349                 RETURN(PTR_ERR(tgt));
2350
2351         rc = md_setattr(tgt->ltd_exp, op_data, ea, ealen, request);
2352
2353         RETURN(rc);
2354 }
2355
2356 static int lmv_fsync(struct obd_export *exp, const struct lu_fid *fid,
2357                      struct ptlrpc_request **request)
2358 {
2359         struct obd_device *obd = exp->exp_obd;
2360         struct lmv_obd *lmv = &obd->u.lmv;
2361         struct lmv_tgt_desc *tgt;
2362         int rc;
2363
2364         ENTRY;
2365
2366         tgt = lmv_fid2tgt(lmv, fid);
2367         if (IS_ERR(tgt))
2368                 RETURN(PTR_ERR(tgt));
2369
2370         rc = md_fsync(tgt->ltd_exp, fid, request);
2371         RETURN(rc);
2372 }
2373
2374 struct stripe_dirent {
2375         struct page             *sd_page;
2376         struct lu_dirpage       *sd_dp;
2377         struct lu_dirent        *sd_ent;
2378         bool                     sd_eof;
2379 };
2380
2381 struct lmv_dir_ctxt {
2382         struct lmv_obd          *ldc_lmv;
2383         struct md_op_data       *ldc_op_data;
2384         struct md_callback      *ldc_cb_op;
2385         __u64                    ldc_hash;
2386         int                      ldc_count;
2387         struct stripe_dirent     ldc_stripes[0];
2388 };
2389
2390 static inline void stripe_dirent_unload(struct stripe_dirent *stripe)
2391 {
2392         if (stripe->sd_page) {
2393                 kunmap(stripe->sd_page);
2394                 put_page(stripe->sd_page);
2395                 stripe->sd_page = NULL;
2396                 stripe->sd_ent = NULL;
2397         }
2398 }
2399
2400 static inline void put_lmv_dir_ctxt(struct lmv_dir_ctxt *ctxt)
2401 {
2402         int i;
2403
2404         for (i = 0; i < ctxt->ldc_count; i++)
2405                 stripe_dirent_unload(&ctxt->ldc_stripes[i]);
2406 }
2407
2408 /* if @ent is dummy, or . .., get next */
2409 static struct lu_dirent *stripe_dirent_get(struct lmv_dir_ctxt *ctxt,
2410                                            struct lu_dirent *ent,
2411                                            int stripe_index)
2412 {
2413         for (; ent; ent = lu_dirent_next(ent)) {
2414                 /* Skip dummy entry */
2415                 if (le16_to_cpu(ent->lde_namelen) == 0)
2416                         continue;
2417
2418                 /* skip . and .. for other stripes */
2419                 if (stripe_index &&
2420                     (strncmp(ent->lde_name, ".",
2421                              le16_to_cpu(ent->lde_namelen)) == 0 ||
2422                      strncmp(ent->lde_name, "..",
2423                              le16_to_cpu(ent->lde_namelen)) == 0))
2424                         continue;
2425
2426                 if (le64_to_cpu(ent->lde_hash) >= ctxt->ldc_hash)
2427                         break;
2428         }
2429
2430         return ent;
2431 }
2432
2433 static struct lu_dirent *stripe_dirent_load(struct lmv_dir_ctxt *ctxt,
2434                                             struct stripe_dirent *stripe,
2435                                             int stripe_index)
2436 {
2437         struct md_op_data *op_data = ctxt->ldc_op_data;
2438         struct lmv_oinfo *oinfo;
2439         struct lu_fid fid = op_data->op_fid1;
2440         struct inode *inode = op_data->op_data;
2441         struct lmv_tgt_desc *tgt;
2442         struct lu_dirent *ent = stripe->sd_ent;
2443         __u64 hash = ctxt->ldc_hash;
2444         int rc = 0;
2445
2446         ENTRY;
2447
2448         LASSERT(stripe == &ctxt->ldc_stripes[stripe_index]);
2449         LASSERT(!ent);
2450
2451         do {
2452                 if (stripe->sd_page) {
2453                         __u64 end = le64_to_cpu(stripe->sd_dp->ldp_hash_end);
2454
2455                         /* @hash should be the last dirent hash */
2456                         LASSERTF(hash <= end,
2457                                  "ctxt@%p stripe@%p hash %llx end %llx\n",
2458                                  ctxt, stripe, hash, end);
2459                         /* unload last page */
2460                         stripe_dirent_unload(stripe);
2461                         /* eof */
2462                         if (end == MDS_DIR_END_OFF) {
2463                                 stripe->sd_eof = true;
2464                                 break;
2465                         }
2466                         hash = end;
2467                 }
2468
2469                 oinfo = &op_data->op_mea1->lsm_md_oinfo[stripe_index];
2470                 if (!oinfo->lmo_root) {
2471                         rc = -ENOENT;
2472                         break;
2473                 }
2474
2475                 tgt = lmv_tgt(ctxt->ldc_lmv, oinfo->lmo_mds);
2476                 if (!tgt) {
2477                         rc = -ENODEV;
2478                         break;
2479                 }
2480
2481                 /* op_data is shared by stripes, reset after use */
2482                 op_data->op_fid1 = oinfo->lmo_fid;
2483                 op_data->op_fid2 = oinfo->lmo_fid;
2484                 op_data->op_data = oinfo->lmo_root;
2485
2486                 rc = md_read_page(tgt->ltd_exp, op_data, ctxt->ldc_cb_op, hash,
2487                                   &stripe->sd_page);
2488
2489                 op_data->op_fid1 = fid;
2490                 op_data->op_fid2 = fid;
2491                 op_data->op_data = inode;
2492
2493                 if (rc)
2494                         break;
2495
2496                 stripe->sd_dp = page_address(stripe->sd_page);
2497                 ent = stripe_dirent_get(ctxt, lu_dirent_start(stripe->sd_dp),
2498                                         stripe_index);
2499                 /* in case a page filled with ., .. and dummy, read next */
2500         } while (!ent);
2501
2502         stripe->sd_ent = ent;
2503         if (rc) {
2504                 LASSERT(!ent);
2505                 /* treat error as eof, so dir can be partially accessed */
2506                 stripe->sd_eof = true;
2507                 LCONSOLE_WARN("dir "DFID" stripe %d readdir failed: %d, "
2508                               "directory is partially accessed!\n",
2509                               PFID(&ctxt->ldc_op_data->op_fid1), stripe_index,
2510                               rc);
2511         }
2512
2513         RETURN(ent);
2514 }
2515
2516 static int lmv_file_resync(struct obd_export *exp, struct md_op_data *data)
2517 {
2518         struct obd_device *obd = exp->exp_obd;
2519         struct lmv_obd *lmv = &obd->u.lmv;
2520         struct lmv_tgt_desc *tgt;
2521         int rc;
2522
2523         ENTRY;
2524
2525         rc = lmv_check_connect(obd);
2526         if (rc != 0)
2527                 RETURN(rc);
2528
2529         tgt = lmv_fid2tgt(lmv, &data->op_fid1);
2530         if (IS_ERR(tgt))
2531                 RETURN(PTR_ERR(tgt));
2532
2533         data->op_flags |= MF_MDC_CANCEL_FID1;
2534         rc = md_file_resync(tgt->ltd_exp, data);
2535         RETURN(rc);
2536 }
2537
2538 /**
2539  * Get dirent with the closest hash for striped directory
2540  *
2541  * This function will search the dir entry, whose hash value is the
2542  * closest(>=) to hash from all of sub-stripes, and it is only being called
2543  * for striped directory.
2544  *
2545  * \param[in] ctxt              dir read context
2546  *
2547  * \retval                      dirent get the entry successfully
2548  *                              NULL does not get the entry, normally it means
2549  *                              it reaches the end of the directory, while read
2550  *                              stripe dirent error is ignored to allow partial
2551  *                              access.
2552  */
2553 static struct lu_dirent *lmv_dirent_next(struct lmv_dir_ctxt *ctxt)
2554 {
2555         struct stripe_dirent *stripe;
2556         struct lu_dirent *ent = NULL;
2557         int i;
2558         int min = -1;
2559
2560         /* TODO: optimize with k-way merge sort */
2561         for (i = 0; i < ctxt->ldc_count; i++) {
2562                 stripe = &ctxt->ldc_stripes[i];
2563                 if (stripe->sd_eof)
2564                         continue;
2565
2566                 if (!stripe->sd_ent) {
2567                         stripe_dirent_load(ctxt, stripe, i);
2568                         if (!stripe->sd_ent) {
2569                                 LASSERT(stripe->sd_eof);
2570                                 continue;
2571                         }
2572                 }
2573
2574                 if (min == -1 ||
2575                     le64_to_cpu(ctxt->ldc_stripes[min].sd_ent->lde_hash) >
2576                     le64_to_cpu(stripe->sd_ent->lde_hash)) {
2577                         min = i;
2578                         if (le64_to_cpu(stripe->sd_ent->lde_hash) ==
2579                             ctxt->ldc_hash)
2580                                 break;
2581                 }
2582         }
2583
2584         if (min != -1) {
2585                 stripe = &ctxt->ldc_stripes[min];
2586                 ent = stripe->sd_ent;
2587                 /* pop found dirent */
2588                 stripe->sd_ent = stripe_dirent_get(ctxt, lu_dirent_next(ent),
2589                                                    min);
2590         }
2591
2592         return ent;
2593 }
2594
2595 /**
2596  * Build dir entry page for striped directory
2597  *
2598  * This function gets one entry by @offset from a striped directory. It will
2599  * read entries from all of stripes, and choose one closest to the required
2600  * offset(&offset). A few notes
2601  * 1. skip . and .. for non-zero stripes, because there can only have one .
2602  * and .. in a directory.
2603  * 2. op_data will be shared by all of stripes, instead of allocating new
2604  * one, so need to restore before reusing.
2605  *
2606  * \param[in] exp       obd export refer to LMV
2607  * \param[in] op_data   hold those MD parameters of read_entry
2608  * \param[in] cb_op     ldlm callback being used in enqueue in mdc_read_entry
2609  * \param[in] offset    starting hash offset
2610  * \param[out] ppage    the page holding the entry. Note: because the entry
2611  *                      will be accessed in upper layer, so we need hold the
2612  *                      page until the usages of entry is finished, see
2613  *                      ll_dir_entry_next.
2614  *
2615  * retval               =0 if get entry successfully
2616  *                      <0 cannot get entry
2617  */
2618 static int lmv_striped_read_page(struct obd_export *exp,
2619                                  struct md_op_data *op_data,
2620                                  struct md_callback *cb_op,
2621                                  __u64 offset, struct page **ppage)
2622 {
2623         struct page *page = NULL;
2624         struct lu_dirpage *dp;
2625         void *start;
2626         struct lu_dirent *ent;
2627         struct lu_dirent *last_ent;
2628         int stripe_count;
2629         struct lmv_dir_ctxt *ctxt;
2630         struct lu_dirent *next = NULL;
2631         __u16 ent_size;
2632         size_t left_bytes;
2633         int rc = 0;
2634         ENTRY;
2635
2636         /* Allocate a page and read entries from all of stripes and fill
2637          * the page by hash order */
2638         page = alloc_page(GFP_KERNEL);
2639         if (!page)
2640                 RETURN(-ENOMEM);
2641
2642         /* Initialize the entry page */
2643         dp = kmap(page);
2644         memset(dp, 0, sizeof(*dp));
2645         dp->ldp_hash_start = cpu_to_le64(offset);
2646
2647         start = dp + 1;
2648         left_bytes = PAGE_SIZE - sizeof(*dp);
2649         ent = start;
2650         last_ent = ent;
2651
2652         /* initalize dir read context */
2653         stripe_count = op_data->op_mea1->lsm_md_stripe_count;
2654         OBD_ALLOC(ctxt, offsetof(typeof(*ctxt), ldc_stripes[stripe_count]));
2655         if (!ctxt)
2656                 GOTO(free_page, rc = -ENOMEM);
2657         ctxt->ldc_lmv = &exp->exp_obd->u.lmv;
2658         ctxt->ldc_op_data = op_data;
2659         ctxt->ldc_cb_op = cb_op;
2660         ctxt->ldc_hash = offset;
2661         ctxt->ldc_count = stripe_count;
2662
2663         while (1) {
2664                 next = lmv_dirent_next(ctxt);
2665
2666                 /* end of directory */
2667                 if (!next) {
2668                         ctxt->ldc_hash = MDS_DIR_END_OFF;
2669                         break;
2670                 }
2671                 ctxt->ldc_hash = le64_to_cpu(next->lde_hash);
2672
2673                 ent_size = le16_to_cpu(next->lde_reclen);
2674
2675                 /* the last entry lde_reclen is 0, but it might not be the last
2676                  * one of this temporay dir page */
2677                 if (!ent_size)
2678                         ent_size = lu_dirent_calc_size(
2679                                         le16_to_cpu(next->lde_namelen),
2680                                         le32_to_cpu(next->lde_attrs));
2681                 /* page full */
2682                 if (ent_size > left_bytes)
2683                         break;
2684
2685                 memcpy(ent, next, ent_size);
2686
2687                 /* Replace . with master FID and Replace .. with the parent FID
2688                  * of master object */
2689                 if (strncmp(ent->lde_name, ".",
2690                             le16_to_cpu(ent->lde_namelen)) == 0 &&
2691                     le16_to_cpu(ent->lde_namelen) == 1)
2692                         fid_cpu_to_le(&ent->lde_fid, &op_data->op_fid1);
2693                 else if (strncmp(ent->lde_name, "..",
2694                                    le16_to_cpu(ent->lde_namelen)) == 0 &&
2695                            le16_to_cpu(ent->lde_namelen) == 2)
2696                         fid_cpu_to_le(&ent->lde_fid, &op_data->op_fid3);
2697
2698                 CDEBUG(D_INODE, "entry %.*s hash %#llx\n",
2699                        le16_to_cpu(ent->lde_namelen), ent->lde_name,
2700                        le64_to_cpu(ent->lde_hash));
2701
2702                 left_bytes -= ent_size;
2703                 ent->lde_reclen = cpu_to_le16(ent_size);
2704                 last_ent = ent;
2705                 ent = (void *)ent + ent_size;
2706         };
2707
2708         last_ent->lde_reclen = 0;
2709
2710         if (ent == start)
2711                 dp->ldp_flags |= LDF_EMPTY;
2712         else if (ctxt->ldc_hash == le64_to_cpu(last_ent->lde_hash))
2713                 dp->ldp_flags |= LDF_COLLIDE;
2714         dp->ldp_flags = cpu_to_le32(dp->ldp_flags);
2715         dp->ldp_hash_end = cpu_to_le64(ctxt->ldc_hash);
2716
2717         put_lmv_dir_ctxt(ctxt);
2718         OBD_FREE(ctxt, offsetof(typeof(*ctxt), ldc_stripes[stripe_count]));
2719
2720         *ppage = page;
2721
2722         RETURN(0);
2723
2724 free_page:
2725         kunmap(page);
2726         __free_page(page);
2727
2728         return rc;
2729 }
2730
2731 int lmv_read_page(struct obd_export *exp, struct md_op_data *op_data,
2732                   struct md_callback *cb_op, __u64 offset,
2733                   struct page **ppage)
2734 {
2735         struct obd_device *obd = exp->exp_obd;
2736         struct lmv_obd *lmv = &obd->u.lmv;
2737         struct lmv_tgt_desc *tgt;
2738         int rc;
2739
2740         ENTRY;
2741
2742         if (unlikely(lmv_dir_foreign(op_data->op_mea1)))
2743                 RETURN(-ENODATA);
2744
2745         if (unlikely(lmv_dir_striped(op_data->op_mea1))) {
2746                 rc = lmv_striped_read_page(exp, op_data, cb_op, offset, ppage);
2747                 RETURN(rc);
2748         }
2749
2750         tgt = lmv_fid2tgt(lmv, &op_data->op_fid1);
2751         if (IS_ERR(tgt))
2752                 RETURN(PTR_ERR(tgt));
2753
2754         rc = md_read_page(tgt->ltd_exp, op_data, cb_op, offset, ppage);
2755
2756         RETURN(rc);
2757 }
2758
2759 /**
2760  * Unlink a file/directory
2761  *
2762  * Unlink a file or directory under the parent dir. The unlink request
2763  * usually will be sent to the MDT where the child is located, but if
2764  * the client does not have the child FID then request will be sent to the
2765  * MDT where the parent is located.
2766  *
2767  * If the parent is a striped directory then it also needs to locate which
2768  * stripe the name of the child is located, and replace the parent FID
2769  * (@op->op_fid1) with the stripe FID. Note: if the stripe is unknown,
2770  * it will walk through all of sub-stripes until the child is being
2771  * unlinked finally.
2772  *
2773  * \param[in] exp       export refer to LMV
2774  * \param[in] op_data   different parameters transferred beween client
2775  *                      MD stacks, name, namelen, FIDs etc.
2776  *                      op_fid1 is the parent FID, op_fid2 is the child
2777  *                      FID.
2778  * \param[out] request  point to the request of unlink.
2779  *
2780  * retval               0 if succeed
2781  *                      negative errno if failed.
2782  */
2783 static int lmv_unlink(struct obd_export *exp, struct md_op_data *op_data,
2784                       struct ptlrpc_request **request)
2785 {
2786         struct obd_device *obd = exp->exp_obd;
2787         struct lmv_obd *lmv = &obd->u.lmv;
2788         struct lmv_tgt_desc *tgt;
2789         struct lmv_tgt_desc *parent_tgt;
2790         struct mdt_body *body;
2791         int rc;
2792
2793         ENTRY;
2794
2795         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2796         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2797         op_data->op_cap = cfs_curproc_cap_pack();
2798
2799 retry:
2800         parent_tgt = lmv_locate_tgt(lmv, op_data);
2801         if (IS_ERR(parent_tgt))
2802                 RETURN(PTR_ERR(parent_tgt));
2803
2804         if (likely(!fid_is_zero(&op_data->op_fid2))) {
2805                 tgt = lmv_fid2tgt(lmv, &op_data->op_fid2);
2806                 if (IS_ERR(tgt))
2807                         RETURN(PTR_ERR(tgt));
2808         } else {
2809                 tgt = parent_tgt;
2810         }
2811
2812         /*
2813          * If child's fid is given, cancel unused locks for it if it is from
2814          * another export than parent.
2815          *
2816          * LOOKUP lock for child (fid3) should also be cancelled on parent
2817          * tgt_tgt in mdc_unlink().
2818          */
2819         op_data->op_flags |= MF_MDC_CANCEL_FID1 | MF_MDC_CANCEL_FID3;
2820
2821         if (parent_tgt != tgt)
2822                 rc = lmv_early_cancel(exp, parent_tgt, op_data, tgt->ltd_index,
2823                                       LCK_EX, MDS_INODELOCK_LOOKUP,
2824                                       MF_MDC_CANCEL_FID3);
2825
2826         rc = lmv_early_cancel(exp, NULL, op_data, tgt->ltd_index, LCK_EX,
2827                               MDS_INODELOCK_ELC, MF_MDC_CANCEL_FID3);
2828         if (rc)
2829                 RETURN(rc);
2830
2831         CDEBUG(D_INODE, "unlink with fid="DFID"/"DFID" -> mds #%u\n",
2832                PFID(&op_data->op_fid1), PFID(&op_data->op_fid2),
2833                tgt->ltd_index);
2834
2835         rc = md_unlink(tgt->ltd_exp, op_data, request);
2836         if (rc == -ENOENT && lmv_dir_retry_check_update(op_data)) {
2837                 ptlrpc_req_finished(*request);
2838                 *request = NULL;
2839                 goto retry;
2840         }
2841
2842         if (rc != -EREMOTE)
2843                 RETURN(rc);
2844
2845         body = req_capsule_server_get(&(*request)->rq_pill, &RMF_MDT_BODY);
2846         if (body == NULL)
2847                 RETURN(-EPROTO);
2848
2849         /* Not cross-ref case, just get out of here. */
2850         if (likely(!(body->mbo_valid & OBD_MD_MDS)))
2851                 RETURN(rc);
2852
2853         /* This is a remote object, try remote MDT. */
2854         op_data->op_fid2 = body->mbo_fid1;
2855         ptlrpc_req_finished(*request);
2856         *request = NULL;
2857
2858         tgt = lmv_fid2tgt(lmv, &op_data->op_fid2);
2859         if (IS_ERR(tgt))
2860                 RETURN(PTR_ERR(tgt));
2861
2862         goto retry;
2863 }
2864
2865 static int lmv_precleanup(struct obd_device *obd)
2866 {
2867         ENTRY;
2868         libcfs_kkuc_group_rem(&obd->obd_uuid, 0, KUC_GRP_HSM);
2869         fld_client_debugfs_fini(&obd->u.lmv.lmv_fld);
2870         lprocfs_obd_cleanup(obd);
2871         lprocfs_free_md_stats(obd);
2872         RETURN(0);
2873 }
2874
2875 /**
2876  * Get by key a value associated with a LMV device.
2877  *
2878  * Dispatch request to lower-layer devices as needed.
2879  *
2880  * \param[in] env               execution environment for this thread
2881  * \param[in] exp               export for the LMV device
2882  * \param[in] keylen            length of key identifier
2883  * \param[in] key               identifier of key to get value for
2884  * \param[in] vallen            size of \a val
2885  * \param[out] val              pointer to storage location for value
2886  * \param[in] lsm               optional striping metadata of object
2887  *
2888  * \retval 0            on success
2889  * \retval negative     negated errno on failure
2890  */
2891 static int lmv_get_info(const struct lu_env *env, struct obd_export *exp,
2892                         __u32 keylen, void *key, __u32 *vallen, void *val)
2893 {
2894         struct obd_device *obd;
2895         struct lmv_obd *lmv;
2896         struct lu_tgt_desc *tgt;
2897         int rc = 0;
2898
2899         ENTRY;
2900
2901         obd = class_exp2obd(exp);
2902         if (obd == NULL) {
2903                 CDEBUG(D_IOCTL, "Invalid client cookie %#llx\n",
2904                        exp->exp_handle.h_cookie);
2905                 RETURN(-EINVAL);
2906         }
2907
2908         lmv = &obd->u.lmv;
2909         if (keylen >= strlen("remote_flag") && !strcmp(key, "remote_flag")) {
2910                 LASSERT(*vallen == sizeof(__u32));
2911                 lmv_foreach_connected_tgt(lmv, tgt) {
2912                         if (!obd_get_info(env, tgt->ltd_exp, keylen, key,
2913                                           vallen, val))
2914                                 RETURN(0);
2915                 }
2916                 RETURN(-EINVAL);
2917         } else if (KEY_IS(KEY_MAX_EASIZE) ||
2918                    KEY_IS(KEY_DEFAULT_EASIZE) ||
2919                    KEY_IS(KEY_CONN_DATA)) {
2920                 /*
2921                  * Forwarding this request to first MDS, it should know LOV
2922                  * desc.
2923                  */
2924                 tgt = lmv_tgt(lmv, 0);
2925                 if (!tgt)
2926                         RETURN(-ENODEV);
2927
2928                 rc = obd_get_info(env, tgt->ltd_exp, keylen, key, vallen, val);
2929                 if (!rc && KEY_IS(KEY_CONN_DATA))
2930                         exp->exp_connect_data = *(struct obd_connect_data *)val;
2931                 RETURN(rc);
2932         } else if (KEY_IS(KEY_TGT_COUNT)) {
2933                 *((int *)val) = lmv->lmv_mdt_descs.ltd_tgts_size;
2934                 RETURN(0);
2935         }
2936
2937         CDEBUG(D_IOCTL, "Invalid key\n");
2938         RETURN(-EINVAL);
2939 }
2940
2941 static int lmv_rmfid(struct obd_export *exp, struct fid_array *fa,
2942                      int *__rcs, struct ptlrpc_request_set *_set)
2943 {
2944         struct obd_device *obddev = class_exp2obd(exp);
2945         struct ptlrpc_request_set *set = _set;
2946         struct lmv_obd *lmv = &obddev->u.lmv;
2947         int tgt_count = lmv->lmv_mdt_count;
2948         struct lu_tgt_desc *tgt;
2949         struct fid_array *fat, **fas = NULL;
2950         int i, rc, **rcs = NULL;
2951
2952         if (!set) {
2953                 set = ptlrpc_prep_set();
2954                 if (!set)
2955                         RETURN(-ENOMEM);
2956         }
2957
2958         /* split FIDs by targets */
2959         OBD_ALLOC(fas, sizeof(fas) * tgt_count);
2960         if (fas == NULL)
2961                 GOTO(out, rc = -ENOMEM);
2962         OBD_ALLOC(rcs, sizeof(int *) * tgt_count);
2963         if (rcs == NULL)
2964                 GOTO(out_fas, rc = -ENOMEM);
2965
2966         for (i = 0; i < fa->fa_nr; i++) {
2967                 unsigned int idx;
2968
2969                 rc = lmv_fld_lookup(lmv, &fa->fa_fids[i], &idx);
2970                 if (rc) {
2971                         CDEBUG(D_OTHER, "can't lookup "DFID": rc = %d\n",
2972                                PFID(&fa->fa_fids[i]), rc);
2973                         continue;
2974                 }
2975                 LASSERT(idx < tgt_count);
2976                 if (!fas[idx])
2977                         OBD_ALLOC(fas[idx], offsetof(struct fid_array,
2978                                   fa_fids[fa->fa_nr]));
2979                 if (!fas[idx])
2980                         GOTO(out, rc = -ENOMEM);
2981                 if (!rcs[idx])
2982                         OBD_ALLOC(rcs[idx], sizeof(int) * fa->fa_nr);
2983                 if (!rcs[idx])
2984                         GOTO(out, rc = -ENOMEM);
2985
2986                 fat = fas[idx];
2987                 fat->fa_fids[fat->fa_nr++] = fa->fa_fids[i];
2988         }
2989
2990         lmv_foreach_connected_tgt(lmv, tgt) {
2991                 fat = fas[tgt->ltd_index];
2992                 if (!fat || fat->fa_nr == 0)
2993                         continue;
2994                 rc = md_rmfid(tgt->ltd_exp, fat, rcs[tgt->ltd_index], set);
2995         }
2996
2997         rc = ptlrpc_set_wait(NULL, set);
2998         if (rc == 0) {
2999                 int j = 0;
3000                 for (i = 0; i < tgt_count; i++) {
3001                         fat = fas[i];
3002                         if (!fat || fat->fa_nr == 0)
3003                                 continue;
3004                         /* copy FIDs back */
3005                         memcpy(fa->fa_fids + j, fat->fa_fids,
3006                                fat->fa_nr * sizeof(struct lu_fid));
3007                         /* copy rcs back */
3008                         memcpy(__rcs + j, rcs[i], fat->fa_nr * sizeof(**rcs));
3009                         j += fat->fa_nr;
3010                 }
3011         }
3012         if (set != _set)
3013                 ptlrpc_set_destroy(set);
3014
3015 out:
3016         for (i = 0; i < tgt_count; i++) {
3017                 if (fas && fas[i])
3018                         OBD_FREE(fas[i], offsetof(struct fid_array,
3019                                                 fa_fids[fa->fa_nr]));
3020                 if (rcs && rcs[i])
3021                         OBD_FREE(rcs[i], sizeof(int) * fa->fa_nr);
3022         }
3023         if (rcs)
3024                 OBD_FREE(rcs, sizeof(int *) * tgt_count);
3025 out_fas:
3026         if (fas)
3027                 OBD_FREE(fas, sizeof(fas) * tgt_count);
3028
3029         RETURN(rc);
3030 }
3031
3032 /**
3033  * Asynchronously set by key a value associated with a LMV device.
3034  *
3035  * Dispatch request to lower-layer devices as needed.
3036  *
3037  * \param[in] env       execution environment for this thread
3038  * \param[in] exp       export for the LMV device
3039  * \param[in] keylen    length of key identifier
3040  * \param[in] key       identifier of key to store value for
3041  * \param[in] vallen    size of value to store
3042  * \param[in] val       pointer to data to be stored
3043  * \param[in] set       optional list of related ptlrpc requests
3044  *
3045  * \retval 0            on success
3046  * \retval negative     negated errno on failure
3047  */
3048 int lmv_set_info_async(const struct lu_env *env, struct obd_export *exp,
3049                         __u32 keylen, void *key, __u32 vallen, void *val,
3050                         struct ptlrpc_request_set *set)
3051 {
3052         struct lmv_tgt_desc     *tgt = NULL;
3053         struct obd_device       *obd;
3054         struct lmv_obd          *lmv;
3055         int rc = 0;
3056         ENTRY;
3057
3058         obd = class_exp2obd(exp);
3059         if (obd == NULL) {
3060                 CDEBUG(D_IOCTL, "Invalid client cookie %#llx\n",
3061                        exp->exp_handle.h_cookie);
3062                 RETURN(-EINVAL);
3063         }
3064         lmv = &obd->u.lmv;
3065
3066         if (KEY_IS(KEY_READ_ONLY) || KEY_IS(KEY_FLUSH_CTX) ||
3067             KEY_IS(KEY_DEFAULT_EASIZE)) {
3068                 int err = 0;
3069
3070                 lmv_foreach_connected_tgt(lmv, tgt) {
3071                         err = obd_set_info_async(env, tgt->ltd_exp,
3072                                                  keylen, key, vallen, val, set);
3073                         if (err && rc == 0)
3074                                 rc = err;
3075                 }
3076
3077                 RETURN(rc);
3078         }
3079
3080         RETURN(-EINVAL);
3081 }
3082
3083 static int lmv_unpack_md_v1(struct obd_export *exp, struct lmv_stripe_md *lsm,
3084                             const struct lmv_mds_md_v1 *lmm1)
3085 {
3086         struct lmv_obd  *lmv = &exp->exp_obd->u.lmv;
3087         int             stripe_count;
3088         int             cplen;
3089         int             i;
3090         int             rc = 0;
3091         ENTRY;
3092
3093         lsm->lsm_md_magic = le32_to_cpu(lmm1->lmv_magic);
3094         lsm->lsm_md_stripe_count = le32_to_cpu(lmm1->lmv_stripe_count);
3095         lsm->lsm_md_master_mdt_index = le32_to_cpu(lmm1->lmv_master_mdt_index);
3096         if (OBD_FAIL_CHECK(OBD_FAIL_UNKNOWN_LMV_STRIPE))
3097                 lsm->lsm_md_hash_type = LMV_HASH_TYPE_UNKNOWN;
3098         else
3099                 lsm->lsm_md_hash_type = le32_to_cpu(lmm1->lmv_hash_type);
3100         lsm->lsm_md_layout_version = le32_to_cpu(lmm1->lmv_layout_version);
3101         lsm->lsm_md_migrate_offset = le32_to_cpu(lmm1->lmv_migrate_offset);
3102         lsm->lsm_md_migrate_hash = le32_to_cpu(lmm1->lmv_migrate_hash);
3103         cplen = strlcpy(lsm->lsm_md_pool_name, lmm1->lmv_pool_name,
3104                         sizeof(lsm->lsm_md_pool_name));
3105
3106         if (cplen >= sizeof(lsm->lsm_md_pool_name))
3107                 RETURN(-E2BIG);
3108
3109         CDEBUG(D_INFO, "unpack lsm count %d, master %d hash_type %#x "
3110                "layout_version %d\n", lsm->lsm_md_stripe_count,
3111                lsm->lsm_md_master_mdt_index, lsm->lsm_md_hash_type,
3112                lsm->lsm_md_layout_version);
3113
3114         stripe_count = le32_to_cpu(lmm1->lmv_stripe_count);
3115         for (i = 0; i < stripe_count; i++) {
3116                 fid_le_to_cpu(&lsm->lsm_md_oinfo[i].lmo_fid,
3117                               &lmm1->lmv_stripe_fids[i]);
3118                 /*
3119                  * set default value -1, so lmv_locate_tgt() knows this stripe
3120                  * target is not initialized.
3121                  */
3122                 lsm->lsm_md_oinfo[i].lmo_mds = LMV_OFFSET_DEFAULT;
3123                 if (!fid_is_sane(&lsm->lsm_md_oinfo[i].lmo_fid))
3124                         continue;
3125
3126                 rc = lmv_fld_lookup(lmv, &lsm->lsm_md_oinfo[i].lmo_fid,
3127                                     &lsm->lsm_md_oinfo[i].lmo_mds);
3128                 if (rc == -ENOENT)
3129                         continue;
3130
3131                 if (rc)
3132                         RETURN(rc);
3133
3134                 CDEBUG(D_INFO, "unpack fid #%d "DFID"\n", i,
3135                        PFID(&lsm->lsm_md_oinfo[i].lmo_fid));
3136         }
3137
3138         RETURN(rc);
3139 }
3140
3141 static inline int lmv_unpack_user_md(struct obd_export *exp,
3142                                      struct lmv_stripe_md *lsm,
3143                                      const struct lmv_user_md *lmu)
3144 {
3145         lsm->lsm_md_magic = le32_to_cpu(lmu->lum_magic);
3146         lsm->lsm_md_stripe_count = le32_to_cpu(lmu->lum_stripe_count);
3147         lsm->lsm_md_master_mdt_index = le32_to_cpu(lmu->lum_stripe_offset);
3148         lsm->lsm_md_hash_type = le32_to_cpu(lmu->lum_hash_type);
3149
3150         return 0;
3151 }
3152
3153 static int lmv_unpackmd(struct obd_export *exp, struct lmv_stripe_md **lsmp,
3154                         const union lmv_mds_md *lmm, size_t lmm_size)
3155 {
3156         struct lmv_stripe_md     *lsm;
3157         int                      lsm_size;
3158         int                      rc;
3159         bool                     allocated = false;
3160         ENTRY;
3161
3162         LASSERT(lsmp != NULL);
3163
3164         lsm = *lsmp;
3165         /* Free memmd */
3166         if (lsm != NULL && lmm == NULL) {
3167                 int i;
3168                 struct lmv_foreign_md *lfm = (struct lmv_foreign_md *)lsm;
3169
3170                 if (lfm->lfm_magic == LMV_MAGIC_FOREIGN) {
3171                         size_t lfm_size;
3172
3173                         lfm_size = lfm->lfm_length + offsetof(typeof(*lfm),
3174                                                               lfm_value[0]);
3175                         OBD_FREE_LARGE(lfm, lfm_size);
3176                         RETURN(0);
3177                 }
3178
3179                 if (lmv_dir_striped(lsm)) {
3180                         for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
3181                                 if (lsm->lsm_md_oinfo[i].lmo_root)
3182                                         iput(lsm->lsm_md_oinfo[i].lmo_root);
3183                         }
3184                         lsm_size = lmv_stripe_md_size(lsm->lsm_md_stripe_count);
3185                 } else {
3186                         lsm_size = lmv_stripe_md_size(0);
3187                 }
3188                 OBD_FREE(lsm, lsm_size);
3189                 *lsmp = NULL;
3190                 RETURN(0);
3191         }
3192
3193         /* foreign lmv case */
3194         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_FOREIGN) {
3195                 struct lmv_foreign_md *lfm = (struct lmv_foreign_md *)lsm;
3196
3197                 if (lfm == NULL) {
3198                         OBD_ALLOC_LARGE(lfm, lmm_size);
3199                         if (lfm == NULL)
3200                                 RETURN(-ENOMEM);
3201                         *lsmp = (struct lmv_stripe_md *)lfm;
3202                 }
3203                 lfm->lfm_magic = le32_to_cpu(lmm->lmv_foreign_md.lfm_magic);
3204                 lfm->lfm_length = le32_to_cpu(lmm->lmv_foreign_md.lfm_length);
3205                 lfm->lfm_type = le32_to_cpu(lmm->lmv_foreign_md.lfm_type);
3206                 lfm->lfm_flags = le32_to_cpu(lmm->lmv_foreign_md.lfm_flags);
3207                 memcpy(&lfm->lfm_value, &lmm->lmv_foreign_md.lfm_value,
3208                        lfm->lfm_length);
3209                 RETURN(lmm_size);
3210         }
3211
3212         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_STRIPE)
3213                 RETURN(-EPERM);
3214
3215         /* Unpack memmd */
3216         if (le32_to_cpu(lmm->lmv_magic) != LMV_MAGIC_V1 &&
3217             le32_to_cpu(lmm->lmv_magic) != LMV_USER_MAGIC) {
3218                 CERROR("%s: invalid lmv magic %x: rc = %d\n",
3219                        exp->exp_obd->obd_name, le32_to_cpu(lmm->lmv_magic),
3220                        -EIO);
3221                 RETURN(-EIO);
3222         }
3223
3224         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_V1)
3225                 lsm_size = lmv_stripe_md_size(lmv_mds_md_stripe_count_get(lmm));
3226         else
3227                 /**
3228                  * Unpack default dirstripe(lmv_user_md) to lmv_stripe_md,
3229                  * stripecount should be 0 then.
3230                  */
3231                 lsm_size = lmv_stripe_md_size(0);
3232
3233         if (lsm == NULL) {
3234                 OBD_ALLOC(lsm, lsm_size);
3235                 if (lsm == NULL)
3236                         RETURN(-ENOMEM);
3237                 allocated = true;
3238                 *lsmp = lsm;
3239         }
3240
3241         switch (le32_to_cpu(lmm->lmv_magic)) {
3242         case LMV_MAGIC_V1:
3243                 rc = lmv_unpack_md_v1(exp, lsm, &lmm->lmv_md_v1);
3244                 break;
3245         case LMV_USER_MAGIC:
3246                 rc = lmv_unpack_user_md(exp, lsm, &lmm->lmv_user_md);
3247                 break;
3248         default:
3249                 CERROR("%s: unrecognized magic %x\n", exp->exp_obd->obd_name,
3250                        le32_to_cpu(lmm->lmv_magic));
3251                 rc = -EINVAL;
3252                 break;
3253         }
3254
3255         if (rc != 0 && allocated) {
3256                 OBD_FREE(lsm, lsm_size);
3257                 *lsmp = NULL;
3258                 lsm_size = rc;
3259         }
3260         RETURN(lsm_size);
3261 }
3262
3263 void lmv_free_memmd(struct lmv_stripe_md *lsm)
3264 {
3265         lmv_unpackmd(NULL, &lsm, NULL, 0);
3266 }
3267 EXPORT_SYMBOL(lmv_free_memmd);
3268
3269 static int lmv_cancel_unused(struct obd_export *exp, const struct lu_fid *fid,
3270                              union ldlm_policy_data *policy,
3271                              enum ldlm_mode mode, enum ldlm_cancel_flags flags,
3272                              void *opaque)
3273 {
3274         struct lmv_obd *lmv = &exp->exp_obd->u.lmv;
3275         struct lu_tgt_desc *tgt;
3276         int err;
3277         int rc = 0;
3278
3279         ENTRY;
3280
3281         LASSERT(fid != NULL);
3282
3283         lmv_foreach_connected_tgt(lmv, tgt) {
3284                 if (!tgt->ltd_active)
3285                         continue;
3286
3287                 err = md_cancel_unused(tgt->ltd_exp, fid, policy, mode, flags,
3288                                        opaque);
3289                 if (!rc)
3290                         rc = err;
3291         }
3292         RETURN(rc);
3293 }