lustre/lmv/lmv_obd.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2013, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_LMV
  38 #ifdef __KERNEL__
  39 #include <linux/slab.h>
  40 #include <linux/module.h>
  41 #include <linux/init.h>
  42 #include <linux/slab.h>
  43 #include <linux/pagemap.h>
  44 #include <linux/mm.h>
  45 #include <linux/math64.h>
  46 #include <linux/seq_file.h>
  47 #include <linux/namei.h>
  48 #else
  49 #include <liblustre.h>
  50 #endif
  51
  52 #include <lustre/lustre_idl.h>
  53 #include <obd_support.h>
  54 #include <lustre_lib.h>
  55 #include <lustre_net.h>
  56 #include <obd_class.h>
  57 #include <lustre_lmv.h>
  58 #include <lprocfs_status.h>
  59 #include <cl_object.h>
  60 #include <lclient.h>
  61 #include <lustre_lite.h>
  62 #include <lustre_fid.h>
  63 #include <lustre_ioctl.h>
  64 #include "lmv_internal.h"
  65
  66 /* This hash is only for testing purpose */
  67 static inline unsigned int
  68 lmv_hash_all_chars(unsigned int count, const char *name, int namelen)
  69 {
  70         unsigned int c = 0;
  71         const unsigned char *p = (const unsigned char *)name;
  72
  73         while (--namelen >= 0)
  74                 c += p[namelen];
  75
  76         c = c % count;
  77
  78         return c;
  79 }
  80
  81 static inline unsigned int
  82 lmv_hash_fnv1a(unsigned int count, const char *name, int namelen)
  83 {
  84         __u64   hash;
  85
  86         hash = lustre_hash_fnv_1a_64(name, namelen);
  87
  88         hash = hash % count;
  89
  90         return hash;
  91 }
  92
  93 int lmv_name_to_stripe_index(__u32 lmv_hash_type, unsigned int stripe_count,
  94                              const char *name, int namelen)
  95 {
  96         int     idx;
  97         __u32   hash_type = lmv_hash_type & LMV_HASH_TYPE_MASK;
  98
  99         LASSERT(namelen > 0);
 100         if (stripe_count <= 1)
 101                 return 0;
 102
 103         /* for migrating object, always start from 0 stripe */
 104         if (lmv_hash_type & LMV_HASH_FLAG_MIGRATION)
 105                 return 0;
 106
 107         switch (hash_type) {
 108         case LMV_HASH_TYPE_ALL_CHARS:
 109                 idx = lmv_hash_all_chars(stripe_count, name, namelen);
 110                 break;
 111         case LMV_HASH_TYPE_FNV_1A_64:
 112                 idx = lmv_hash_fnv1a(stripe_count, name, namelen);
 113                 break;
 114         default:
 115                 CERROR("Unknown hash type 0x%x\n", hash_type);
 116                 return -EINVAL;
 117         }
 118
 119         CDEBUG(D_INFO, "name %.*s hash_type %d idx %d\n", namelen, name,
 120                hash_type, idx);
 121
 122         return idx;
 123 }
 124
 125 static void lmv_activate_target(struct lmv_obd *lmv,
 126                                 struct lmv_tgt_desc *tgt,
 127                                 int activate)
 128 {
 129         if (tgt->ltd_active == activate)
 130                 return;
 131
 132         tgt->ltd_active = activate;
 133         lmv->desc.ld_active_tgt_count += (activate ? 1 : -1);
 134 }
 135
 136 /**
 137  * Error codes:
 138  *
 139  *  -EINVAL  : UUID can't be found in the LMV's target list
 140  *  -ENOTCONN: The UUID is found, but the target connection is bad (!)
 141  *  -EBADF   : The UUID is found, but the OBD of the wrong type (!)
 142  */
 143 static int lmv_set_mdc_active(struct lmv_obd *lmv,
 144                               const struct obd_uuid *uuid,
 145                               int activate)
 146 {
 147         struct lmv_tgt_desc     *tgt = NULL;
 148         struct obd_device       *obd;
 149         __u32                    i;
 150         int                      rc = 0;
 151         ENTRY;
 152
 153         CDEBUG(D_INFO, "Searching in lmv %p for uuid %s (activate=%d)\n",
 154                         lmv, uuid->uuid, activate);
 155
 156         spin_lock(&lmv->lmv_lock);
 157         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 158                 tgt = lmv->tgts[i];
 159                 if (tgt == NULL || tgt->ltd_exp == NULL)
 160                         continue;
 161
 162                 CDEBUG(D_INFO, "Target idx %d is %s conn "LPX64"\n", i,
 163                        tgt->ltd_uuid.uuid, tgt->ltd_exp->exp_handle.h_cookie);
 164
 165                 if (obd_uuid_equals(uuid, &tgt->ltd_uuid))
 166                         break;
 167         }
 168
 169         if (i == lmv->desc.ld_tgt_count)
 170                 GOTO(out_lmv_lock, rc = -EINVAL);
 171
 172         obd = class_exp2obd(tgt->ltd_exp);
 173         if (obd == NULL)
 174                 GOTO(out_lmv_lock, rc = -ENOTCONN);
 175
 176         CDEBUG(D_INFO, "Found OBD %s=%s device %d (%p) type %s at LMV idx %d\n",
 177                obd->obd_name, obd->obd_uuid.uuid, obd->obd_minor, obd,
 178                obd->obd_type->typ_name, i);
 179         LASSERT(strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) == 0);
 180
 181         if (tgt->ltd_active == activate) {
 182                 CDEBUG(D_INFO, "OBD %p already %sactive!\n", obd,
 183                        activate ? "" : "in");
 184                 GOTO(out_lmv_lock, rc);
 185         }
 186
 187         CDEBUG(D_INFO, "Marking OBD %p %sactive\n", obd,
 188                activate ? "" : "in");
 189         lmv_activate_target(lmv, tgt, activate);
 190         EXIT;
 191
 192  out_lmv_lock:
 193         spin_unlock(&lmv->lmv_lock);
 194         return rc;
 195 }
 196
 197 struct obd_uuid *lmv_get_uuid(struct obd_export *exp)
 198 {
 199         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
 200         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
 201
 202         return (tgt == NULL) ? NULL : obd_get_uuid(tgt->ltd_exp);
 203 }
 204
 205 static int lmv_notify(struct obd_device *obd, struct obd_device *watched,
 206                       enum obd_notify_event ev, void *data)
 207 {
 208         struct obd_connect_data *conn_data;
 209         struct lmv_obd          *lmv = &obd->u.lmv;
 210         struct obd_uuid         *uuid;
 211         int                      rc = 0;
 212         ENTRY;
 213
 214         if (strcmp(watched->obd_type->typ_name, LUSTRE_MDC_NAME)) {
 215                 CERROR("unexpected notification of %s %s!\n",
 216                        watched->obd_type->typ_name,
 217                        watched->obd_name);
 218                 RETURN(-EINVAL);
 219         }
 220
 221         uuid = &watched->u.cli.cl_target_uuid;
 222         if (ev == OBD_NOTIFY_ACTIVE || ev == OBD_NOTIFY_INACTIVE) {
 223                 /*
 224                  * Set MDC as active before notifying the observer, so the
 225                  * observer can use the MDC normally.
 226                  */
 227                 rc = lmv_set_mdc_active(lmv, uuid,
 228                                         ev == OBD_NOTIFY_ACTIVE);
 229                 if (rc) {
 230                         CERROR("%sactivation of %s failed: %d\n",
 231                                ev == OBD_NOTIFY_ACTIVE ? "" : "de",
 232                                uuid->uuid, rc);
 233                         RETURN(rc);
 234                 }
 235         } else if (ev == OBD_NOTIFY_OCD) {
 236                 conn_data = &watched->u.cli.cl_import->imp_connect_data;
 237                 /*
 238                  * XXX: Make sure that ocd_connect_flags from all targets are
 239                  * the same. Otherwise one of MDTs runs wrong version or
 240                  * something like this.  --umka
 241                  */
 242                 obd->obd_self_export->exp_connect_data = *conn_data;
 243         }
 244 #if 0
 245         else if (ev == OBD_NOTIFY_DISCON) {
 246                 /*
 247                  * For disconnect event, flush fld cache for failout MDS case.
 248                  */
 249                 fld_client_flush(&lmv->lmv_fld);
 250         }
 251 #endif
 252         /*
 253          * Pass the notification up the chain.
 254          */
 255         if (obd->obd_observer)
 256                 rc = obd_notify(obd->obd_observer, watched, ev, data);
 257
 258         RETURN(rc);
 259 }
 260
 261 /**
 262  * This is fake connect function. Its purpose is to initialize lmv and say
 263  * caller that everything is okay. Real connection will be performed later.
 264  */
 265 static int lmv_connect(const struct lu_env *env,
 266                        struct obd_export **exp, struct obd_device *obd,
 267                        struct obd_uuid *cluuid, struct obd_connect_data *data,
 268                        void *localdata)
 269 {
 270         struct lmv_obd        *lmv = &obd->u.lmv;
 271         struct lustre_handle  conn = { 0 };
 272         int                    rc = 0;
 273         ENTRY;
 274
 275         /*
 276          * We don't want to actually do the underlying connections more than
 277          * once, so keep track.
 278          */
 279         lmv->refcount++;
 280         if (lmv->refcount > 1) {
 281                 *exp = NULL;
 282                 RETURN(0);
 283         }
 284
 285         rc = class_connect(&conn, obd, cluuid);
 286         if (rc) {
 287                 CERROR("class_connection() returned %d\n", rc);
 288                 RETURN(rc);
 289         }
 290
 291         *exp = class_conn2export(&conn);
 292         class_export_get(*exp);
 293
 294         lmv->exp = *exp;
 295         lmv->connected = 0;
 296         lmv->cluuid = *cluuid;
 297
 298         if (data)
 299                 lmv->conn_data = *data;
 300
 301         if (obd->obd_type->typ_procsym == NULL) {
 302                 obd->obd_type->typ_procsym = lprocfs_seq_register("target_obds",
 303                                                          obd->obd_proc_entry,
 304                                                          NULL, NULL);
 305                 if (IS_ERR(obd->obd_type->typ_procsym)) {
 306                         CERROR("could not register /proc/fs/lustre/%s/%s/target_obds.",
 307                                obd->obd_type->typ_name, obd->obd_name);
 308                         obd->obd_type->typ_procsym = NULL;
 309                 }
 310         }
 311
 312         /*
 313          * All real clients should perform actual connection right away, because
 314          * it is possible, that LMV will not have opportunity to connect targets
 315          * and MDC stuff will be called directly, for instance while reading
 316          * ../mdc/../kbytesfree procfs file, etc.
 317          */
 318         if (data != NULL && (data->ocd_connect_flags & OBD_CONNECT_REAL))
 319                 rc = lmv_check_connect(obd);
 320
 321         if (rc && obd->obd_type->typ_procsym != NULL)
 322                 lprocfs_remove(&obd->obd_type->typ_procsym);
 323         RETURN(rc);
 324 }
 325
 326 static void lmv_set_timeouts(struct obd_device *obd)
 327 {
 328         struct lmv_obd          *lmv;
 329         __u32                    i;
 330
 331         lmv = &obd->u.lmv;
 332         if (lmv->server_timeout == 0)
 333                 return;
 334
 335         if (lmv->connected == 0)
 336                 return;
 337
 338         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 339                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
 340
 341                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active)
 342                         continue;
 343
 344                 obd_set_info_async(NULL, tgt->ltd_exp, sizeof(KEY_INTERMDS),
 345                                    KEY_INTERMDS, 0, NULL, NULL);
 346         }
 347 }
 348
 349 static int lmv_init_ea_size(struct obd_export *exp, int easize,
 350                             int def_easize, int cookiesize, int def_cookiesize)
 351 {
 352         struct obd_device       *obd = exp->exp_obd;
 353         struct lmv_obd          *lmv = &obd->u.lmv;
 354         __u32                    i;
 355         int                      rc = 0;
 356         int                      change = 0;
 357         ENTRY;
 358
 359         if (lmv->max_easize < easize) {
 360                 lmv->max_easize = easize;
 361                 change = 1;
 362         }
 363         if (lmv->max_def_easize < def_easize) {
 364                 lmv->max_def_easize = def_easize;
 365                 change = 1;
 366         }
 367         if (lmv->max_cookiesize < cookiesize) {
 368                 lmv->max_cookiesize = cookiesize;
 369                 change = 1;
 370         }
 371         if (lmv->max_def_cookiesize < def_cookiesize) {
 372                 lmv->max_def_cookiesize = def_cookiesize;
 373                 change = 1;
 374         }
 375         if (change == 0)
 376                 RETURN(0);
 377
 378         if (lmv->connected == 0)
 379                 RETURN(0);
 380
 381         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 382                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
 383
 384                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active) {
 385                         CWARN("%s: NULL export for %d\n", obd->obd_name, i);
 386                         continue;
 387                 }
 388
 389                 rc = md_init_ea_size(tgt->ltd_exp, easize, def_easize,
 390                                      cookiesize, def_cookiesize);
 391                 if (rc) {
 392                         CERROR("%s: obd_init_ea_size() failed on MDT target %d:"
 393                                " rc = %d.\n", obd->obd_name, i, rc);
 394                         break;
 395                 }
 396         }
 397         RETURN(rc);
 398 }
 399
 400 #define MAX_STRING_SIZE 128
 401
 402 int lmv_connect_mdc(struct obd_device *obd, struct lmv_tgt_desc *tgt)
 403 {
 404         struct lmv_obd          *lmv = &obd->u.lmv;
 405         struct obd_uuid         *cluuid = &lmv->cluuid;
 406         struct obd_uuid          lmv_mdc_uuid = { "LMV_MDC_UUID" };
 407         struct obd_device       *mdc_obd;
 408         struct obd_export       *mdc_exp;
 409         struct lu_fld_target     target;
 410         int                      rc;
 411         ENTRY;
 412
 413         mdc_obd = class_find_client_obd(&tgt->ltd_uuid, LUSTRE_MDC_NAME,
 414                                         &obd->obd_uuid);
 415         if (!mdc_obd) {
 416                 CERROR("target %s not attached\n", tgt->ltd_uuid.uuid);
 417                 RETURN(-EINVAL);
 418         }
 419
 420         CDEBUG(D_CONFIG, "connect to %s(%s) - %s, %s FOR %s\n",
 421                 mdc_obd->obd_name, mdc_obd->obd_uuid.uuid,
 422                 tgt->ltd_uuid.uuid, obd->obd_uuid.uuid,
 423                 cluuid->uuid);
 424
 425         if (!mdc_obd->obd_set_up) {
 426                 CERROR("target %s is not set up\n", tgt->ltd_uuid.uuid);
 427                 RETURN(-EINVAL);
 428         }
 429
 430         rc = obd_connect(NULL, &mdc_exp, mdc_obd, &lmv_mdc_uuid,
 431                          &lmv->conn_data, NULL);
 432         if (rc) {
 433                 CERROR("target %s connect error %d\n", tgt->ltd_uuid.uuid, rc);
 434                 RETURN(rc);
 435         }
 436
 437         /*
 438          * Init fid sequence client for this mdc and add new fld target.
 439          */
 440         rc = obd_fid_init(mdc_obd, mdc_exp, LUSTRE_SEQ_METADATA);
 441         if (rc)
 442                 RETURN(rc);
 443
 444         target.ft_srv = NULL;
 445         target.ft_exp = mdc_exp;
 446         target.ft_idx = tgt->ltd_idx;
 447
 448         fld_client_add_target(&lmv->lmv_fld, &target);
 449
 450         rc = obd_register_observer(mdc_obd, obd);
 451         if (rc) {
 452                 obd_disconnect(mdc_exp);
 453                 CERROR("target %s register_observer error %d\n",
 454                        tgt->ltd_uuid.uuid, rc);
 455                 RETURN(rc);
 456         }
 457
 458         if (obd->obd_observer) {
 459                 /*
 460                  * Tell the observer about the new target.
 461                  */
 462                 rc = obd_notify(obd->obd_observer, mdc_exp->exp_obd,
 463                                 OBD_NOTIFY_ACTIVE,
 464                                 (void *)(tgt - lmv->tgts[0]));
 465                 if (rc) {
 466                         obd_disconnect(mdc_exp);
 467                         RETURN(rc);
 468                 }
 469         }
 470
 471         tgt->ltd_active = 1;
 472         tgt->ltd_exp = mdc_exp;
 473         lmv->desc.ld_active_tgt_count++;
 474
 475         md_init_ea_size(tgt->ltd_exp, lmv->max_easize, lmv->max_def_easize,
 476                         lmv->max_cookiesize, lmv->max_def_cookiesize);
 477
 478         CDEBUG(D_CONFIG, "Connected to %s(%s) successfully (%d)\n",
 479                 mdc_obd->obd_name, mdc_obd->obd_uuid.uuid,
 480                 atomic_read(&obd->obd_refcount));
 481
 482         if (obd->obd_type->typ_procsym != NULL) {
 483                 struct proc_dir_entry *mdc_symlink;
 484
 485                 LASSERT(mdc_obd->obd_type != NULL);
 486                 LASSERT(mdc_obd->obd_type->typ_name != NULL);
 487                 mdc_symlink = lprocfs_add_symlink(mdc_obd->obd_name,
 488                                                   obd->obd_type->typ_procsym,
 489                                                   "../../../%s/%s",
 490                                                   mdc_obd->obd_type->typ_name,
 491                                                   mdc_obd->obd_name);
 492                 if (mdc_symlink == NULL) {
 493                         CERROR("Could not register LMV target "
 494                                "/proc/fs/lustre/%s/%s/target_obds/%s.",
 495                                obd->obd_type->typ_name, obd->obd_name,
 496                                mdc_obd->obd_name);
 497                         lprocfs_remove(&obd->obd_type->typ_procsym);
 498                 }
 499         }
 500         RETURN(0);
 501 }
 502
 503 static void lmv_del_target(struct lmv_obd *lmv, int index)
 504 {
 505         if (lmv->tgts[index] == NULL)
 506                 return;
 507
 508         OBD_FREE_PTR(lmv->tgts[index]);
 509         lmv->tgts[index] = NULL;
 510         return;
 511 }
 512
 513 static int lmv_add_target(struct obd_device *obd, struct obd_uuid *uuidp,
 514                            __u32 index, int gen)
 515 {
 516         struct lmv_obd      *lmv = &obd->u.lmv;
 517         struct lmv_tgt_desc *tgt;
 518         int                  rc = 0;
 519         ENTRY;
 520
 521         CDEBUG(D_CONFIG, "Target uuid: %s. index %d\n", uuidp->uuid, index);
 522
 523         lmv_init_lock(lmv);
 524
 525         if (lmv->desc.ld_tgt_count == 0) {
 526                 struct obd_device *mdc_obd;
 527
 528                 mdc_obd = class_find_client_obd(uuidp, LUSTRE_MDC_NAME,
 529                                                 &obd->obd_uuid);
 530                 if (!mdc_obd) {
 531                         lmv_init_unlock(lmv);
 532                         CERROR("%s: Target %s not attached: rc = %d\n",
 533                                obd->obd_name, uuidp->uuid, -EINVAL);
 534                         RETURN(-EINVAL);
 535                 }
 536         }
 537
 538         if ((index < lmv->tgts_size) && (lmv->tgts[index] != NULL)) {
 539                 tgt = lmv->tgts[index];
 540                 CERROR("%s: UUID %s already assigned at LOV target index %d:"
 541                        " rc = %d\n", obd->obd_name,
 542                        obd_uuid2str(&tgt->ltd_uuid), index, -EEXIST);
 543                 lmv_init_unlock(lmv);
 544                 RETURN(-EEXIST);
 545         }
 546
 547         if (index >= lmv->tgts_size) {
 548                 /* We need to reallocate the lmv target array. */
 549                 struct lmv_tgt_desc **newtgts, **old = NULL;
 550                 __u32 newsize = 1;
 551                 __u32 oldsize = 0;
 552
 553                 while (newsize < index + 1)
 554                         newsize = newsize << 1;
 555                 OBD_ALLOC(newtgts, sizeof(*newtgts) * newsize);
 556                 if (newtgts == NULL) {
 557                         lmv_init_unlock(lmv);
 558                         RETURN(-ENOMEM);
 559                 }
 560
 561                 if (lmv->tgts_size) {
 562                         memcpy(newtgts, lmv->tgts,
 563                                sizeof(*newtgts) * lmv->tgts_size);
 564                         old = lmv->tgts;
 565                         oldsize = lmv->tgts_size;
 566                 }
 567
 568                 lmv->tgts = newtgts;
 569                 lmv->tgts_size = newsize;
 570                 smp_rmb();
 571                 if (old)
 572                         OBD_FREE(old, sizeof(*old) * oldsize);
 573
 574                 CDEBUG(D_CONFIG, "tgts: %p size: %d\n", lmv->tgts,
 575                        lmv->tgts_size);
 576         }
 577
 578         OBD_ALLOC_PTR(tgt);
 579         if (!tgt) {
 580                 lmv_init_unlock(lmv);
 581                 RETURN(-ENOMEM);
 582         }
 583
 584         mutex_init(&tgt->ltd_fid_mutex);
 585         tgt->ltd_idx = index;
 586         tgt->ltd_uuid = *uuidp;
 587         tgt->ltd_active = 0;
 588         lmv->tgts[index] = tgt;
 589         if (index >= lmv->desc.ld_tgt_count)
 590                 lmv->desc.ld_tgt_count = index + 1;
 591
 592         if (lmv->connected) {
 593                 rc = lmv_connect_mdc(obd, tgt);
 594                 if (rc) {
 595                         spin_lock(&lmv->lmv_lock);
 596                         lmv->desc.ld_tgt_count--;
 597                         memset(tgt, 0, sizeof(*tgt));
 598                         spin_unlock(&lmv->lmv_lock);
 599                 } else {
 600                         int easize = sizeof(struct lmv_stripe_md) +
 601                                 lmv->desc.ld_tgt_count * sizeof(struct lu_fid);
 602                         lmv_init_ea_size(obd->obd_self_export, easize, 0, 0, 0);
 603                 }
 604         }
 605
 606         lmv_init_unlock(lmv);
 607         RETURN(rc);
 608 }
 609
 610 int lmv_check_connect(struct obd_device *obd)
 611 {
 612         struct lmv_obd          *lmv = &obd->u.lmv;
 613         struct lmv_tgt_desc     *tgt;
 614         __u32                    i;
 615         int                      rc;
 616         int                      easize;
 617         ENTRY;
 618
 619         if (lmv->connected)
 620                 RETURN(0);
 621
 622         lmv_init_lock(lmv);
 623         if (lmv->connected) {
 624                 lmv_init_unlock(lmv);
 625                 RETURN(0);
 626         }
 627
 628         if (lmv->desc.ld_tgt_count == 0) {
 629                 lmv_init_unlock(lmv);
 630                 CERROR("%s: no targets configured.\n", obd->obd_name);
 631                 RETURN(-EINVAL);
 632         }
 633
 634         LASSERT(lmv->tgts != NULL);
 635
 636         if (lmv->tgts[0] == NULL) {
 637                 lmv_init_unlock(lmv);
 638                 CERROR("%s: no target configured for index 0.\n",
 639                        obd->obd_name);
 640                 RETURN(-EINVAL);
 641         }
 642
 643         CDEBUG(D_CONFIG, "Time to connect %s to %s\n",
 644                lmv->cluuid.uuid, obd->obd_name);
 645
 646         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 647                 tgt = lmv->tgts[i];
 648                 if (tgt == NULL)
 649                         continue;
 650                 rc = lmv_connect_mdc(obd, tgt);
 651                 if (rc)
 652                         GOTO(out_disc, rc);
 653         }
 654
 655         lmv_set_timeouts(obd);
 656         class_export_put(lmv->exp);
 657         lmv->connected = 1;
 658         easize = lmv_mds_md_size(lmv->desc.ld_tgt_count, LMV_MAGIC);
 659         lmv_init_ea_size(obd->obd_self_export, easize, 0, 0, 0);
 660         lmv_init_unlock(lmv);
 661         RETURN(0);
 662
 663  out_disc:
 664         while (i-- > 0) {
 665                 int rc2;
 666                 tgt = lmv->tgts[i];
 667                 if (tgt == NULL)
 668                         continue;
 669                 tgt->ltd_active = 0;
 670                 if (tgt->ltd_exp) {
 671                         --lmv->desc.ld_active_tgt_count;
 672                         rc2 = obd_disconnect(tgt->ltd_exp);
 673                         if (rc2) {
 674                                 CERROR("LMV target %s disconnect on "
 675                                        "MDC idx %d: error %d\n",
 676                                        tgt->ltd_uuid.uuid, i, rc2);
 677                         }
 678                 }
 679         }
 680         class_disconnect(lmv->exp);
 681         lmv_init_unlock(lmv);
 682         RETURN(rc);
 683 }
 684
 685 static int lmv_disconnect_mdc(struct obd_device *obd, struct lmv_tgt_desc *tgt)
 686 {
 687         struct lmv_obd         *lmv = &obd->u.lmv;
 688         struct obd_device      *mdc_obd;
 689         int                     rc;
 690         ENTRY;
 691
 692         LASSERT(tgt != NULL);
 693         LASSERT(obd != NULL);
 694
 695         mdc_obd = class_exp2obd(tgt->ltd_exp);
 696
 697         if (mdc_obd) {
 698                 mdc_obd->obd_force = obd->obd_force;
 699                 mdc_obd->obd_fail = obd->obd_fail;
 700                 mdc_obd->obd_no_recov = obd->obd_no_recov;
 701         }
 702
 703         if (obd->obd_type->typ_procsym != NULL)
 704                 lprocfs_remove_proc_entry(mdc_obd->obd_name,
 705                                           obd->obd_type->typ_procsym);
 706
 707         rc = obd_fid_fini(tgt->ltd_exp->exp_obd);
 708         if (rc)
 709                 CERROR("Can't finanize fids factory\n");
 710
 711         CDEBUG(D_INFO, "Disconnected from %s(%s) successfully\n",
 712                tgt->ltd_exp->exp_obd->obd_name,
 713                tgt->ltd_exp->exp_obd->obd_uuid.uuid);
 714
 715         obd_register_observer(tgt->ltd_exp->exp_obd, NULL);
 716         rc = obd_disconnect(tgt->ltd_exp);
 717         if (rc) {
 718                 if (tgt->ltd_active) {
 719                         CERROR("Target %s disconnect error %d\n",
 720                                tgt->ltd_uuid.uuid, rc);
 721                 }
 722         }
 723
 724         lmv_activate_target(lmv, tgt, 0);
 725         tgt->ltd_exp = NULL;
 726         RETURN(0);
 727 }
 728
 729 static int lmv_disconnect(struct obd_export *exp)
 730 {
 731         struct obd_device       *obd = class_exp2obd(exp);
 732         struct lmv_obd          *lmv = &obd->u.lmv;
 733         int                      rc;
 734         __u32                    i;
 735         ENTRY;
 736
 737         if (!lmv->tgts)
 738                 goto out_local;
 739
 740         /*
 741          * Only disconnect the underlying layers on the final disconnect.
 742          */
 743         lmv->refcount--;
 744         if (lmv->refcount != 0)
 745                 goto out_local;
 746
 747         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 748                 if (lmv->tgts[i] == NULL || lmv->tgts[i]->ltd_exp == NULL)
 749                         continue;
 750
 751                 lmv_disconnect_mdc(obd, lmv->tgts[i]);
 752         }
 753
 754         if (obd->obd_type->typ_procsym != NULL)
 755                 lprocfs_remove(&obd->obd_type->typ_procsym);
 756         else
 757                 CERROR("/proc/fs/lustre/%s/%s/target_obds missing\n",
 758                        obd->obd_type->typ_name, obd->obd_name);
 759
 760 out_local:
 761         /*
 762          * This is the case when no real connection is established by
 763          * lmv_check_connect().
 764          */
 765         if (!lmv->connected)
 766                 class_export_put(exp);
 767         rc = class_disconnect(exp);
 768         if (lmv->refcount == 0)
 769                 lmv->connected = 0;
 770         RETURN(rc);
 771 }
 772
 773 static int lmv_fid2path(struct obd_export *exp, int len, void *karg, void *uarg)
 774 {
 775         struct obd_device       *obddev = class_exp2obd(exp);
 776         struct lmv_obd          *lmv = &obddev->u.lmv;
 777         struct getinfo_fid2path *gf;
 778         struct lmv_tgt_desc     *tgt;
 779         struct getinfo_fid2path *remote_gf = NULL;
 780         int                     remote_gf_size = 0;
 781         int                     rc;
 782
 783         gf = (struct getinfo_fid2path *)karg;
 784         tgt = lmv_find_target(lmv, &gf->gf_fid);
 785         if (IS_ERR(tgt))
 786                 RETURN(PTR_ERR(tgt));
 787
 788 repeat_fid2path:
 789         rc = obd_iocontrol(OBD_IOC_FID2PATH, tgt->ltd_exp, len, gf, uarg);
 790         if (rc != 0 && rc != -EREMOTE)
 791                 GOTO(out_fid2path, rc);
 792
 793         /* If remote_gf != NULL, it means just building the
 794          * path on the remote MDT, copy this path segement to gf */
 795         if (remote_gf != NULL) {
 796                 struct getinfo_fid2path *ori_gf;
 797                 char *ptr;
 798
 799                 ori_gf = (struct getinfo_fid2path *)karg;
 800                 if (strlen(ori_gf->gf_path) +
 801                     strlen(gf->gf_path) > ori_gf->gf_pathlen)
 802                         GOTO(out_fid2path, rc = -EOVERFLOW);
 803
 804                 ptr = ori_gf->gf_path;
 805
 806                 memmove(ptr + strlen(gf->gf_path) + 1, ptr,
 807                         strlen(ori_gf->gf_path));
 808
 809                 strncpy(ptr, gf->gf_path, strlen(gf->gf_path));
 810                 ptr += strlen(gf->gf_path);
 811                 *ptr = '/';
 812         }
 813
 814         CDEBUG(D_INFO, "%s: get path %s "DFID" rec: "LPU64" ln: %u\n",
 815                tgt->ltd_exp->exp_obd->obd_name,
 816                gf->gf_path, PFID(&gf->gf_fid), gf->gf_recno,
 817                gf->gf_linkno);
 818
 819         if (rc == 0)
 820                 GOTO(out_fid2path, rc);
 821
 822         /* sigh, has to go to another MDT to do path building further */
 823         if (remote_gf == NULL) {
 824                 remote_gf_size = sizeof(*remote_gf) + PATH_MAX;
 825                 OBD_ALLOC(remote_gf, remote_gf_size);
 826                 if (remote_gf == NULL)
 827                         GOTO(out_fid2path, rc = -ENOMEM);
 828                 remote_gf->gf_pathlen = PATH_MAX;
 829         }
 830
 831         if (!fid_is_sane(&gf->gf_fid)) {
 832                 CERROR("%s: invalid FID "DFID": rc = %d\n",
 833                        tgt->ltd_exp->exp_obd->obd_name,
 834                        PFID(&gf->gf_fid), -EINVAL);
 835                 GOTO(out_fid2path, rc = -EINVAL);
 836         }
 837
 838         tgt = lmv_find_target(lmv, &gf->gf_fid);
 839         if (IS_ERR(tgt))
 840                 GOTO(out_fid2path, rc = -EINVAL);
 841
 842         remote_gf->gf_fid = gf->gf_fid;
 843         remote_gf->gf_recno = -1;
 844         remote_gf->gf_linkno = -1;
 845         memset(remote_gf->gf_path, 0, remote_gf->gf_pathlen);
 846         gf = remote_gf;
 847         goto repeat_fid2path;
 848
 849 out_fid2path:
 850         if (remote_gf != NULL)
 851                 OBD_FREE(remote_gf, remote_gf_size);
 852         RETURN(rc);
 853 }
 854
 855 static int lmv_hsm_req_count(struct lmv_obd *lmv,
 856                              const struct hsm_user_request *hur,
 857                              const struct lmv_tgt_desc *tgt_mds)
 858 {
 859         __u32                    i;
 860         int                      nr = 0;
 861         struct lmv_tgt_desc     *curr_tgt;
 862
 863         /* count how many requests must be sent to the given target */
 864         for (i = 0; i < hur->hur_request.hr_itemcount; i++) {
 865                 curr_tgt = lmv_find_target(lmv, &hur->hur_user_item[i].hui_fid);
 866                 if (obd_uuid_equals(&curr_tgt->ltd_uuid, &tgt_mds->ltd_uuid))
 867                         nr++;
 868         }
 869         return nr;
 870 }
 871
 872 static void lmv_hsm_req_build(struct lmv_obd *lmv,
 873                               struct hsm_user_request *hur_in,
 874                               const struct lmv_tgt_desc *tgt_mds,
 875                               struct hsm_user_request *hur_out)
 876 {
 877         __u32                    i, nr_out;
 878         struct lmv_tgt_desc     *curr_tgt;
 879
 880         /* build the hsm_user_request for the given target */
 881         hur_out->hur_request = hur_in->hur_request;
 882         nr_out = 0;
 883         for (i = 0; i < hur_in->hur_request.hr_itemcount; i++) {
 884                 curr_tgt = lmv_find_target(lmv,
 885                                            &hur_in->hur_user_item[i].hui_fid);
 886                 if (obd_uuid_equals(&curr_tgt->ltd_uuid, &tgt_mds->ltd_uuid)) {
 887                         hur_out->hur_user_item[nr_out] =
 888                                                 hur_in->hur_user_item[i];
 889                         nr_out++;
 890                 }
 891         }
 892         hur_out->hur_request.hr_itemcount = nr_out;
 893         memcpy(hur_data(hur_out), hur_data(hur_in),
 894                hur_in->hur_request.hr_data_len);
 895 }
 896
 897 static int lmv_hsm_ct_unregister(struct lmv_obd *lmv, unsigned int cmd, int len,
 898                                  struct lustre_kernelcomm *lk, void *uarg)
 899 {
 900         __u32                    i;
 901         int                      rc;
 902         struct kkuc_ct_data     *kcd = NULL;
 903         ENTRY;
 904
 905         /* unregister request (call from llapi_hsm_copytool_fini) */
 906         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 907                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
 908
 909                 if (tgt == NULL || tgt->ltd_exp == NULL)
 910                         continue;
 911                 /* best effort: try to clean as much as possible
 912                  * (continue on error) */
 913                 obd_iocontrol(cmd, tgt->ltd_exp, len, lk, uarg);
 914         }
 915
 916         /* Whatever the result, remove copytool from kuc groups.
 917          * Unreached coordinators will get EPIPE on next requests
 918          * and will unregister automatically.
 919          */
 920         rc = libcfs_kkuc_group_rem(lk->lk_uid, lk->lk_group, (void **)&kcd);
 921         if (kcd != NULL)
 922                 OBD_FREE_PTR(kcd);
 923
 924         RETURN(rc);
 925 }
 926
 927 static int lmv_hsm_ct_register(struct lmv_obd *lmv, unsigned int cmd, int len,
 928                                struct lustre_kernelcomm *lk, void *uarg)
 929 {
 930         struct file             *filp;
 931         __u32                    i, j;
 932         int                      err, rc;
 933         bool                     any_set = false;
 934         struct kkuc_ct_data     *kcd;
 935         ENTRY;
 936
 937         /* All or nothing: try to register to all MDS.
 938          * In case of failure, unregister from previous MDS,
 939          * except if it because of inactive target. */
 940         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 941                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
 942
 943                 if (tgt == NULL || tgt->ltd_exp == NULL)
 944                         continue;
 945                 err = obd_iocontrol(cmd, tgt->ltd_exp, len, lk, uarg);
 946                 if (err) {
 947                         if (tgt->ltd_active) {
 948                                 /* permanent error */
 949                                 CERROR("%s: iocontrol MDC %s on MDT"
 950                                        " idx %d cmd %x: err = %d\n",
 951                                        class_exp2obd(lmv->exp)->obd_name,
 952                                        tgt->ltd_uuid.uuid, i, cmd, err);
 953                                 rc = err;
 954                                 lk->lk_flags |= LK_FLG_STOP;
 955                                 /* unregister from previous MDS */
 956                                 for (j = 0; j < i; j++) {
 957                                         tgt = lmv->tgts[j];
 958                                         if (tgt == NULL || tgt->ltd_exp == NULL)
 959                                                 continue;
 960                                         obd_iocontrol(cmd, tgt->ltd_exp, len,
 961                                                       lk, uarg);
 962                                 }
 963                                 RETURN(rc);
 964                         }
 965                         /* else: transient error.
 966                          * kuc will register to the missing MDT
 967                          * when it is back */
 968                 } else {
 969                         any_set = true;
 970                 }
 971         }
 972
 973         if (!any_set)
 974                 /* no registration done: return error */
 975                 RETURN(-ENOTCONN);
 976
 977         /* at least one registration done, with no failure */
 978         filp = fget(lk->lk_wfd);
 979         if (filp == NULL)
 980                 RETURN(-EBADF);
 981
 982         OBD_ALLOC_PTR(kcd);
 983         if (kcd == NULL) {
 984                 fput(filp);
 985                 RETURN(-ENOMEM);
 986         }
 987         kcd->kcd_magic = KKUC_CT_DATA_MAGIC;
 988         kcd->kcd_uuid = lmv->cluuid;
 989         kcd->kcd_archive = lk->lk_data;
 990
 991         rc = libcfs_kkuc_group_add(filp, lk->lk_uid, lk->lk_group, kcd);
 992         if (rc != 0) {
 993                 if (filp != NULL)
 994                         fput(filp);
 995                 OBD_FREE_PTR(kcd);
 996         }
 997
 998         RETURN(rc);
 999 }
1000
1001
1002
1003
1004 static int lmv_iocontrol(unsigned int cmd, struct obd_export *exp,
1005                          int len, void *karg, void *uarg)
1006 {
1007         struct obd_device       *obddev = class_exp2obd(exp);
1008         struct lmv_obd          *lmv = &obddev->u.lmv;
1009         struct lmv_tgt_desc     *tgt = NULL;
1010         __u32                    i = 0;
1011         int                      rc = 0;
1012         int                      set = 0;
1013         __u32                    count = lmv->desc.ld_tgt_count;
1014         ENTRY;
1015
1016         if (count == 0)
1017                 RETURN(-ENOTTY);
1018
1019         switch (cmd) {
1020         case IOC_OBD_STATFS: {
1021                 struct obd_ioctl_data *data = karg;
1022                 struct obd_device *mdc_obd;
1023                 struct obd_statfs stat_buf = {0};
1024                 __u32 index;
1025
1026                 memcpy(&index, data->ioc_inlbuf2, sizeof(__u32));
1027                 if ((index >= count))
1028                         RETURN(-ENODEV);
1029
1030                 tgt = lmv->tgts[index];
1031                 if (tgt == NULL || !tgt->ltd_active)
1032                         RETURN(-ENODATA);
1033
1034                 mdc_obd = class_exp2obd(tgt->ltd_exp);
1035                 if (!mdc_obd)
1036                         RETURN(-EINVAL);
1037
1038                 /* copy UUID */
1039                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(mdc_obd),
1040                                  min((int) data->ioc_plen2,
1041                                      (int) sizeof(struct obd_uuid))))
1042                         RETURN(-EFAULT);
1043
1044                 rc = obd_statfs(NULL, tgt->ltd_exp, &stat_buf,
1045                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
1046                                 0);
1047                 if (rc)
1048                         RETURN(rc);
1049                 if (copy_to_user(data->ioc_pbuf1, &stat_buf,
1050                                  min((int) data->ioc_plen1,
1051                                      (int) sizeof(stat_buf))))
1052                         RETURN(-EFAULT);
1053                 break;
1054         }
1055         case OBD_IOC_QUOTACTL: {
1056                 struct if_quotactl *qctl = karg;
1057                 struct obd_quotactl *oqctl;
1058
1059                 if (qctl->qc_valid == QC_MDTIDX) {
1060                         if (count <= qctl->qc_idx)
1061                                 RETURN(-EINVAL);
1062
1063                         tgt = lmv->tgts[qctl->qc_idx];
1064                         if (tgt == NULL || tgt->ltd_exp == NULL)
1065                                 RETURN(-EINVAL);
1066                 } else if (qctl->qc_valid == QC_UUID) {
1067                         for (i = 0; i < count; i++) {
1068                                 tgt = lmv->tgts[i];
1069                                 if (tgt == NULL)
1070                                         continue;
1071                                 if (!obd_uuid_equals(&tgt->ltd_uuid,
1072                                                      &qctl->obd_uuid))
1073                                         continue;
1074
1075                                 if (tgt->ltd_exp == NULL)
1076                                         RETURN(-EINVAL);
1077
1078                                 break;
1079                         }
1080                 } else {
1081                         RETURN(-EINVAL);
1082                 }
1083
1084                 if (i >= count)
1085                         RETURN(-EAGAIN);
1086
1087                 LASSERT(tgt != NULL && tgt->ltd_exp != NULL);
1088                 OBD_ALLOC_PTR(oqctl);
1089                 if (!oqctl)
1090                         RETURN(-ENOMEM);
1091
1092                 QCTL_COPY(oqctl, qctl);
1093                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
1094                 if (rc == 0) {
1095                         QCTL_COPY(qctl, oqctl);
1096                         qctl->qc_valid = QC_MDTIDX;
1097                         qctl->obd_uuid = tgt->ltd_uuid;
1098                 }
1099                 OBD_FREE_PTR(oqctl);
1100                 break;
1101         }
1102         case OBD_IOC_CHANGELOG_SEND:
1103         case OBD_IOC_CHANGELOG_CLEAR: {
1104                 struct ioc_changelog *icc = karg;
1105
1106                 if (icc->icc_mdtindex >= count)
1107                         RETURN(-ENODEV);
1108
1109                 tgt = lmv->tgts[icc->icc_mdtindex];
1110                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active)
1111                         RETURN(-ENODEV);
1112                 rc = obd_iocontrol(cmd, tgt->ltd_exp, sizeof(*icc), icc, NULL);
1113                 break;
1114         }
1115         case LL_IOC_GET_CONNECT_FLAGS: {
1116                 tgt = lmv->tgts[0];
1117                 if (tgt == NULL || tgt->ltd_exp == NULL)
1118                         RETURN(-ENODATA);
1119                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1120                 break;
1121         }
1122         case OBD_IOC_FID2PATH: {
1123                 rc = lmv_fid2path(exp, len, karg, uarg);
1124                 break;
1125         }
1126         case LL_IOC_HSM_STATE_GET:
1127         case LL_IOC_HSM_STATE_SET:
1128         case LL_IOC_HSM_ACTION: {
1129                 struct md_op_data       *op_data = karg;
1130
1131                 tgt = lmv_find_target(lmv, &op_data->op_fid1);
1132                 if (IS_ERR(tgt))
1133                         RETURN(PTR_ERR(tgt));
1134
1135                 if (tgt->ltd_exp == NULL)
1136                         RETURN(-EINVAL);
1137
1138                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1139                 break;
1140         }
1141         case LL_IOC_HSM_PROGRESS: {
1142                 const struct hsm_progress_kernel *hpk = karg;
1143
1144                 tgt = lmv_find_target(lmv, &hpk->hpk_fid);
1145                 if (IS_ERR(tgt))
1146                         RETURN(PTR_ERR(tgt));
1147                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1148                 break;
1149         }
1150         case LL_IOC_HSM_REQUEST: {
1151                 struct hsm_user_request *hur = karg;
1152                 unsigned int reqcount = hur->hur_request.hr_itemcount;
1153
1154                 if (reqcount == 0)
1155                         RETURN(0);
1156
1157                 /* if the request is about a single fid
1158                  * or if there is a single MDS, no need to split
1159                  * the request. */
1160                 if (reqcount == 1 || count == 1) {
1161                         tgt = lmv_find_target(lmv,
1162                                               &hur->hur_user_item[0].hui_fid);
1163                         if (IS_ERR(tgt))
1164                                 RETURN(PTR_ERR(tgt));
1165                         rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1166                 } else {
1167                         /* split fid list to their respective MDS */
1168                         for (i = 0; i < count; i++) {
1169                                 unsigned int            nr, reqlen;
1170                                 int                     rc1;
1171                                 struct hsm_user_request *req;
1172
1173                                 tgt = lmv->tgts[i];
1174                                 if (tgt == NULL || tgt->ltd_exp == NULL)
1175                                         continue;
1176
1177                                 nr = lmv_hsm_req_count(lmv, hur, tgt);
1178                                 if (nr == 0) /* nothing for this MDS */
1179                                         continue;
1180
1181                                 /* build a request with fids for this MDS */
1182                                 reqlen = offsetof(typeof(*hur),
1183                                                   hur_user_item[nr])
1184                                                 + hur->hur_request.hr_data_len;
1185                                 OBD_ALLOC_LARGE(req, reqlen);
1186                                 if (req == NULL)
1187                                         RETURN(-ENOMEM);
1188
1189                                 lmv_hsm_req_build(lmv, hur, tgt, req);
1190
1191                                 rc1 = obd_iocontrol(cmd, tgt->ltd_exp, reqlen,
1192                                                     req, uarg);
1193                                 if (rc1 != 0 && rc == 0)
1194                                         rc = rc1;
1195                                 OBD_FREE_LARGE(req, reqlen);
1196                         }
1197                 }
1198                 break;
1199         }
1200         case LL_IOC_LOV_SWAP_LAYOUTS: {
1201                 struct md_op_data       *op_data = karg;
1202                 struct lmv_tgt_desc     *tgt1, *tgt2;
1203
1204                 tgt1 = lmv_find_target(lmv, &op_data->op_fid1);
1205                 if (IS_ERR(tgt1))
1206                         RETURN(PTR_ERR(tgt1));
1207
1208                 tgt2 = lmv_find_target(lmv, &op_data->op_fid2);
1209                 if (IS_ERR(tgt2))
1210                         RETURN(PTR_ERR(tgt2));
1211
1212                 if ((tgt1->ltd_exp == NULL) || (tgt2->ltd_exp == NULL))
1213                         RETURN(-EINVAL);
1214
1215                 /* only files on same MDT can have their layouts swapped */
1216                 if (tgt1->ltd_idx != tgt2->ltd_idx)
1217                         RETURN(-EPERM);
1218
1219                 rc = obd_iocontrol(cmd, tgt1->ltd_exp, len, karg, uarg);
1220                 break;
1221         }
1222         case LL_IOC_HSM_CT_START: {
1223                 struct lustre_kernelcomm *lk = karg;
1224                 if (lk->lk_flags & LK_FLG_STOP)
1225                         rc = lmv_hsm_ct_unregister(lmv, cmd, len, lk, uarg);
1226                 else
1227                         rc = lmv_hsm_ct_register(lmv, cmd, len, lk, uarg);
1228                 break;
1229         }
1230         default:
1231                 for (i = 0; i < count; i++) {
1232                         struct obd_device *mdc_obd;
1233                         int err;
1234
1235                         tgt = lmv->tgts[i];
1236                         if (tgt == NULL || tgt->ltd_exp == NULL)
1237                                 continue;
1238                         /* ll_umount_begin() sets force flag but for lmv, not
1239                          * mdc. Let's pass it through */
1240                         mdc_obd = class_exp2obd(tgt->ltd_exp);
1241                         mdc_obd->obd_force = obddev->obd_force;
1242                         err = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1243                         if (err == -ENODATA && cmd == OBD_IOC_POLL_QUOTACHECK) {
1244                                 RETURN(err);
1245                         } else if (err) {
1246                                 if (tgt->ltd_active) {
1247                                         CERROR("error: iocontrol MDC %s on MDT"
1248                                                " idx %d cmd %x: err = %d\n",
1249                                                tgt->ltd_uuid.uuid, i, cmd, err);
1250                                         if (!rc)
1251                                                 rc = err;
1252                                 }
1253                         } else
1254                                 set = 1;
1255                 }
1256                 if (!set && !rc)
1257                         rc = -EIO;
1258         }
1259         RETURN(rc);
1260 }
1261
1262 #if 0
1263 static int lmv_all_chars_policy(int count, const char *name,
1264                                 int len)
1265 {
1266         unsigned int c = 0;
1267
1268         while (len > 0)
1269                 c += name[--len];
1270         c = c % count;
1271         return c;
1272 }
1273
1274 static int lmv_nid_policy(struct lmv_obd *lmv)
1275 {
1276         struct obd_import *imp;
1277         __u32              id;
1278
1279         /*
1280          * XXX: To get nid we assume that underlying obd device is mdc.
1281          */
1282         imp = class_exp2cliimp(lmv->tgts[0].ltd_exp);
1283         id = imp->imp_connection->c_self ^ (imp->imp_connection->c_self >> 32);
1284         return id % lmv->desc.ld_tgt_count;
1285 }
1286
1287 static int lmv_choose_mds(struct lmv_obd *lmv, struct md_op_data *op_data,
1288                           placement_policy_t placement)
1289 {
1290         switch (placement) {
1291         case PLACEMENT_CHAR_POLICY:
1292                 return lmv_all_chars_policy(lmv->desc.ld_tgt_count,
1293                                             op_data->op_name,
1294                                             op_data->op_namelen);
1295         case PLACEMENT_NID_POLICY:
1296                 return lmv_nid_policy(lmv);
1297
1298         default:
1299                 break;
1300         }
1301
1302         CERROR("Unsupported placement policy %x\n", placement);
1303         return -EINVAL;
1304 }
1305 #endif
1306
1307 /**
1308  * This is _inode_ placement policy function (not name).
1309  */
1310 static int lmv_placement_policy(struct obd_device *obd,
1311                                 struct md_op_data *op_data,
1312                                 mdsno_t *mds)
1313 {
1314         struct lmv_obd          *lmv = &obd->u.lmv;
1315         ENTRY;
1316
1317         LASSERT(mds != NULL);
1318
1319         if (lmv->desc.ld_tgt_count == 1) {
1320                 *mds = 0;
1321                 RETURN(0);
1322         }
1323
1324         /**
1325          * If stripe_offset is provided during setdirstripe
1326          * (setdirstripe -i xx), xx MDS will be choosen.
1327          */
1328         if (op_data->op_cli_flags & CLI_SET_MEA && op_data->op_data != NULL) {
1329                 struct lmv_user_md *lum;
1330
1331                 lum = op_data->op_data;
1332
1333                 if (le32_to_cpu(lum->lum_stripe_offset) != (__u32)-1) {
1334                         *mds = le32_to_cpu(lum->lum_stripe_offset);
1335                 } else {
1336                         /* -1 means default, which will be in the same MDT with
1337                          * the stripe */
1338                         *mds = op_data->op_mds;
1339                         lum->lum_stripe_offset = cpu_to_le32(op_data->op_mds);
1340                 }
1341         } else {
1342                 /* Allocate new fid on target according to operation type and
1343                  * parent home mds. */
1344                 *mds = op_data->op_mds;
1345         }
1346
1347         RETURN(0);
1348 }
1349
1350 int __lmv_fid_alloc(struct lmv_obd *lmv, struct lu_fid *fid,
1351                     mdsno_t mds)
1352 {
1353         struct lmv_tgt_desc     *tgt;
1354         int                      rc;
1355         ENTRY;
1356
1357         tgt = lmv_get_target(lmv, mds);
1358         if (IS_ERR(tgt))
1359                 RETURN(PTR_ERR(tgt));
1360
1361         /*
1362          * New seq alloc and FLD setup should be atomic. Otherwise we may find
1363          * on server that seq in new allocated fid is not yet known.
1364          */
1365         mutex_lock(&tgt->ltd_fid_mutex);
1366
1367         if (tgt->ltd_active == 0 || tgt->ltd_exp == NULL)
1368                 GOTO(out, rc = -ENODEV);
1369
1370         /*
1371          * Asking underlaying tgt layer to allocate new fid.
1372          */
1373         rc = obd_fid_alloc(NULL, tgt->ltd_exp, fid, NULL);
1374         if (rc > 0) {
1375                 LASSERT(fid_is_sane(fid));
1376                 rc = 0;
1377         }
1378
1379         EXIT;
1380 out:
1381         mutex_unlock(&tgt->ltd_fid_mutex);
1382         return rc;
1383 }
1384
1385 int lmv_fid_alloc(const struct lu_env *env, struct obd_export *exp,
1386                   struct lu_fid *fid, struct md_op_data *op_data)
1387 {
1388         struct obd_device     *obd = class_exp2obd(exp);
1389         struct lmv_obd        *lmv = &obd->u.lmv;
1390         mdsno_t                mds = 0;
1391         int                    rc;
1392         ENTRY;
1393
1394         LASSERT(op_data != NULL);
1395         LASSERT(fid != NULL);
1396
1397         rc = lmv_placement_policy(obd, op_data, &mds);
1398         if (rc) {
1399                 CERROR("Can't get target for allocating fid, "
1400                        "rc %d\n", rc);
1401                 RETURN(rc);
1402         }
1403
1404         rc = __lmv_fid_alloc(lmv, fid, mds);
1405         if (rc) {
1406                 CERROR("Can't alloc new fid, rc %d\n", rc);
1407                 RETURN(rc);
1408         }
1409
1410         RETURN(rc);
1411 }
1412
1413 static int lmv_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
1414 {
1415         struct lmv_obd  *lmv = &obd->u.lmv;
1416         struct lmv_desc *desc;
1417         int             rc;
1418         ENTRY;
1419
1420         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
1421                 CERROR("LMV setup requires a descriptor\n");
1422                 RETURN(-EINVAL);
1423         }
1424
1425         desc = (struct lmv_desc *)lustre_cfg_buf(lcfg, 1);
1426         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
1427                 CERROR("Lmv descriptor size wrong: %d > %d\n",
1428                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
1429                 RETURN(-EINVAL);
1430         }
1431
1432         OBD_ALLOC(lmv->tgts, sizeof(*lmv->tgts) * 32);
1433         if (lmv->tgts == NULL)
1434                 RETURN(-ENOMEM);
1435         lmv->tgts_size = 32;
1436
1437         obd_str2uuid(&lmv->desc.ld_uuid, desc->ld_uuid.uuid);
1438         lmv->desc.ld_tgt_count = 0;
1439         lmv->desc.ld_active_tgt_count = 0;
1440         lmv->max_cookiesize = 0;
1441         lmv->max_def_easize = 0;
1442         lmv->max_easize = 0;
1443         lmv->lmv_placement = PLACEMENT_CHAR_POLICY;
1444
1445         spin_lock_init(&lmv->lmv_lock);
1446         mutex_init(&lmv->init_mutex);
1447
1448 #ifdef LPROCFS
1449         obd->obd_vars = lprocfs_lmv_obd_vars;
1450         lprocfs_seq_obd_setup(obd);
1451         lprocfs_alloc_md_stats(obd, 0);
1452         rc = lprocfs_seq_create(obd->obd_proc_entry, "target_obd",
1453                                 0444, &lmv_proc_target_fops, obd);
1454         if (rc)
1455                 CWARN("%s: error adding LMV target_obd file: rc = %d\n",
1456                       obd->obd_name, rc);
1457 #endif
1458         rc = fld_client_init(&lmv->lmv_fld, obd->obd_name,
1459                              LUSTRE_CLI_FLD_HASH_DHT);
1460         if (rc) {
1461                 CERROR("Can't init FLD, err %d\n", rc);
1462                 GOTO(out, rc);
1463         }
1464
1465         RETURN(0);
1466
1467 out:
1468         return rc;
1469 }
1470
1471 static int lmv_cleanup(struct obd_device *obd)
1472 {
1473         struct lmv_obd   *lmv = &obd->u.lmv;
1474         ENTRY;
1475
1476         fld_client_fini(&lmv->lmv_fld);
1477         if (lmv->tgts != NULL) {
1478                 int i;
1479                 for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1480                         if (lmv->tgts[i] == NULL)
1481                                 continue;
1482                         lmv_del_target(lmv, i);
1483                 }
1484                 OBD_FREE(lmv->tgts, sizeof(*lmv->tgts) * lmv->tgts_size);
1485                 lmv->tgts_size = 0;
1486         }
1487         RETURN(0);
1488 }
1489
1490 static int lmv_process_config(struct obd_device *obd, obd_count len, void *buf)
1491 {
1492         struct lustre_cfg       *lcfg = buf;
1493         struct obd_uuid         obd_uuid;
1494         int                     gen;
1495         __u32                   index;
1496         int                     rc;
1497         ENTRY;
1498
1499         switch (lcfg->lcfg_command) {
1500         case LCFG_ADD_MDC:
1501                 /* modify_mdc_tgts add 0:lustre-clilmv  1:lustre-MDT0000_UUID
1502                  * 2:0  3:1  4:lustre-MDT0000-mdc_UUID */
1503                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(obd_uuid.uuid))
1504                         GOTO(out, rc = -EINVAL);
1505
1506                 obd_str2uuid(&obd_uuid,  lustre_cfg_buf(lcfg, 1));
1507
1508                 if (sscanf(lustre_cfg_buf(lcfg, 2), "%u", &index) != 1)
1509                         GOTO(out, rc = -EINVAL);
1510                 if (sscanf(lustre_cfg_buf(lcfg, 3), "%d", &gen) != 1)
1511                         GOTO(out, rc = -EINVAL);
1512                 rc = lmv_add_target(obd, &obd_uuid, index, gen);
1513                 GOTO(out, rc);
1514         default:
1515                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1516                 GOTO(out, rc = -EINVAL);
1517         }
1518 out:
1519         RETURN(rc);
1520 }
1521
1522 static int lmv_statfs(const struct lu_env *env, struct obd_export *exp,
1523                       struct obd_statfs *osfs, __u64 max_age, __u32 flags)
1524 {
1525         struct obd_device       *obd = class_exp2obd(exp);
1526         struct lmv_obd          *lmv = &obd->u.lmv;
1527         struct obd_statfs       *temp;
1528         int                      rc = 0;
1529         __u32                    i;
1530         ENTRY;
1531
1532         rc = lmv_check_connect(obd);
1533         if (rc)
1534                 RETURN(rc);
1535
1536         OBD_ALLOC(temp, sizeof(*temp));
1537         if (temp == NULL)
1538                 RETURN(-ENOMEM);
1539
1540         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1541                 if (lmv->tgts[i] == NULL || lmv->tgts[i]->ltd_exp == NULL)
1542                         continue;
1543
1544                 rc = obd_statfs(env, lmv->tgts[i]->ltd_exp, temp,
1545                                 max_age, flags);
1546                 if (rc) {
1547                         CERROR("can't stat MDS #%d (%s), error %d\n", i,
1548                                lmv->tgts[i]->ltd_exp->exp_obd->obd_name,
1549                                rc);
1550                         GOTO(out_free_temp, rc);
1551                 }
1552
1553                 if (i == 0) {
1554                         *osfs = *temp;
1555                         /* If the statfs is from mount, it will needs
1556                          * retrieve necessary information from MDT0.
1557                          * i.e. mount does not need the merged osfs
1558                          * from all of MDT.
1559                          * And also clients can be mounted as long as
1560                          * MDT0 is in service*/
1561                         if (flags & OBD_STATFS_FOR_MDT0)
1562                                 GOTO(out_free_temp, rc);
1563                 } else {
1564                         osfs->os_bavail += temp->os_bavail;
1565                         osfs->os_blocks += temp->os_blocks;
1566                         osfs->os_ffree += temp->os_ffree;
1567                         osfs->os_files += temp->os_files;
1568                 }
1569         }
1570
1571         EXIT;
1572 out_free_temp:
1573         OBD_FREE(temp, sizeof(*temp));
1574         return rc;
1575 }
1576
1577 static int lmv_getstatus(struct obd_export *exp,
1578                          struct lu_fid *fid,
1579                          struct obd_capa **pc)
1580 {
1581         struct obd_device    *obd = exp->exp_obd;
1582         struct lmv_obd       *lmv = &obd->u.lmv;
1583         int                   rc;
1584         ENTRY;
1585
1586         rc = lmv_check_connect(obd);
1587         if (rc)
1588                 RETURN(rc);
1589
1590         rc = md_getstatus(lmv->tgts[0]->ltd_exp, fid, pc);
1591         RETURN(rc);
1592 }
1593
1594 static int lmv_getxattr(struct obd_export *exp, const struct lu_fid *fid,
1595                         struct obd_capa *oc, obd_valid valid, const char *name,
1596                         const char *input, int input_size, int output_size,
1597                         int flags, struct ptlrpc_request **request)
1598 {
1599         struct obd_device      *obd = exp->exp_obd;
1600         struct lmv_obd         *lmv = &obd->u.lmv;
1601         struct lmv_tgt_desc    *tgt;
1602         int                     rc;
1603         ENTRY;
1604
1605         rc = lmv_check_connect(obd);
1606         if (rc)
1607                 RETURN(rc);
1608
1609         tgt = lmv_find_target(lmv, fid);
1610         if (IS_ERR(tgt))
1611                 RETURN(PTR_ERR(tgt));
1612
1613         rc = md_getxattr(tgt->ltd_exp, fid, oc, valid, name, input,
1614                          input_size, output_size, flags, request);
1615
1616         RETURN(rc);
1617 }
1618
1619 static int lmv_setxattr(struct obd_export *exp, const struct lu_fid *fid,
1620                         struct obd_capa *oc, obd_valid valid, const char *name,
1621                         const char *input, int input_size, int output_size,
1622                         int flags, __u32 suppgid,
1623                         struct ptlrpc_request **request)
1624 {
1625         struct obd_device      *obd = exp->exp_obd;
1626         struct lmv_obd         *lmv = &obd->u.lmv;
1627         struct lmv_tgt_desc    *tgt;
1628         int                     rc;
1629         ENTRY;
1630
1631         rc = lmv_check_connect(obd);
1632         if (rc)
1633                 RETURN(rc);
1634
1635         tgt = lmv_find_target(lmv, fid);
1636         if (IS_ERR(tgt))
1637                 RETURN(PTR_ERR(tgt));
1638
1639         rc = md_setxattr(tgt->ltd_exp, fid, oc, valid, name, input,
1640                          input_size, output_size, flags, suppgid,
1641                          request);
1642
1643         RETURN(rc);
1644 }
1645
1646 static int lmv_getattr(struct obd_export *exp, struct md_op_data *op_data,
1647                        struct ptlrpc_request **request)
1648 {
1649         struct obd_device       *obd = exp->exp_obd;
1650         struct lmv_obd          *lmv = &obd->u.lmv;
1651         struct lmv_tgt_desc     *tgt;
1652         int                      rc;
1653         ENTRY;
1654
1655         rc = lmv_check_connect(obd);
1656         if (rc)
1657                 RETURN(rc);
1658
1659         tgt = lmv_find_target(lmv, &op_data->op_fid1);
1660         if (IS_ERR(tgt))
1661                 RETURN(PTR_ERR(tgt));
1662
1663         if (op_data->op_flags & MF_GET_MDT_IDX) {
1664                 op_data->op_mds = tgt->ltd_idx;
1665                 RETURN(0);
1666         }
1667
1668         rc = md_getattr(tgt->ltd_exp, op_data, request);
1669
1670         RETURN(rc);
1671 }
1672
1673 static int lmv_null_inode(struct obd_export *exp, const struct lu_fid *fid)
1674 {
1675         struct obd_device   *obd = exp->exp_obd;
1676         struct lmv_obd      *lmv = &obd->u.lmv;
1677         __u32                i;
1678         int                  rc;
1679         ENTRY;
1680
1681         rc = lmv_check_connect(obd);
1682         if (rc)
1683                 RETURN(rc);
1684
1685         CDEBUG(D_INODE, "CBDATA for "DFID"\n", PFID(fid));
1686
1687         /*
1688          * With DNE every object can have two locks in different namespaces:
1689          * lookup lock in space of MDT storing direntry and update/open lock in
1690          * space of MDT storing inode.
1691          */
1692         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1693                 if (lmv->tgts[i] == NULL || lmv->tgts[i]->ltd_exp == NULL)
1694                         continue;
1695                 md_null_inode(lmv->tgts[i]->ltd_exp, fid);
1696         }
1697
1698         RETURN(0);
1699 }
1700
1701 static int lmv_find_cbdata(struct obd_export *exp, const struct lu_fid *fid,
1702                            ldlm_iterator_t it, void *data)
1703 {
1704         struct obd_device   *obd = exp->exp_obd;
1705         struct lmv_obd      *lmv = &obd->u.lmv;
1706         __u32                i;
1707         int                  rc;
1708         ENTRY;
1709
1710         rc = lmv_check_connect(obd);
1711         if (rc)
1712                 RETURN(rc);
1713
1714         CDEBUG(D_INODE, "CBDATA for "DFID"\n", PFID(fid));
1715
1716         /*
1717          * With DNE every object can have two locks in different namespaces:
1718          * lookup lock in space of MDT storing direntry and update/open lock in
1719          * space of MDT storing inode.
1720          */
1721         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1722                 if (lmv->tgts[i] == NULL || lmv->tgts[i]->ltd_exp == NULL)
1723                         continue;
1724                 rc = md_find_cbdata(lmv->tgts[i]->ltd_exp, fid, it, data);
1725                 if (rc)
1726                         RETURN(rc);
1727         }
1728
1729         RETURN(rc);
1730 }
1731
1732
1733 static int lmv_close(struct obd_export *exp, struct md_op_data *op_data,
1734                      struct md_open_data *mod, struct ptlrpc_request **request)
1735 {
1736         struct obd_device     *obd = exp->exp_obd;
1737         struct lmv_obd        *lmv = &obd->u.lmv;
1738         struct lmv_tgt_desc   *tgt;
1739         int                    rc;
1740         ENTRY;
1741
1742         rc = lmv_check_connect(obd);
1743         if (rc)
1744                 RETURN(rc);
1745
1746         tgt = lmv_find_target(lmv, &op_data->op_fid1);
1747         if (IS_ERR(tgt))
1748                 RETURN(PTR_ERR(tgt));
1749
1750         CDEBUG(D_INODE, "CLOSE "DFID"\n", PFID(&op_data->op_fid1));
1751         rc = md_close(tgt->ltd_exp, op_data, mod, request);
1752         RETURN(rc);
1753 }
1754
1755 /**
1756  * Choosing the MDT by name or FID in @op_data.
1757  * For non-striped directory, it will locate MDT by fid.
1758  * For striped-directory, it will locate MDT by name. And also
1759  * it will reset op_fid1 with the FID of the choosen stripe.
1760  **/
1761 struct lmv_tgt_desc *
1762 lmv_locate_target_for_name(struct lmv_obd *lmv, struct lmv_stripe_md *lsm,
1763                            const char *name, int namelen, struct lu_fid *fid,
1764                            mdsno_t *mds)
1765 {
1766         struct lmv_tgt_desc     *tgt;
1767         const struct lmv_oinfo  *oinfo;
1768
1769         oinfo = lsm_name_to_stripe_info(lsm, name, namelen);
1770         if (IS_ERR(oinfo))
1771                 RETURN((void *)oinfo);
1772         *fid = oinfo->lmo_fid;
1773         *mds = oinfo->lmo_mds;
1774         tgt = lmv_get_target(lmv, *mds);
1775
1776         CDEBUG(D_INFO, "locate on mds %u "DFID"\n", *mds, PFID(fid));
1777         return tgt;
1778 }
1779
1780 struct lmv_tgt_desc
1781 *lmv_locate_mds(struct lmv_obd *lmv, struct md_op_data *op_data,
1782                 struct lu_fid *fid)
1783 {
1784         struct lmv_stripe_md    *lsm = op_data->op_mea1;
1785         struct lmv_tgt_desc     *tgt;
1786
1787         if (lsm == NULL || op_data->op_namelen == 0) {
1788                 tgt = lmv_find_target(lmv, fid);
1789                 if (IS_ERR(tgt))
1790                         return tgt;
1791
1792                 op_data->op_mds = tgt->ltd_idx;
1793                 return tgt;
1794         }
1795
1796         return lmv_locate_target_for_name(lmv, lsm, op_data->op_name,
1797                                           op_data->op_namelen, fid,
1798                                           &op_data->op_mds);
1799 }
1800
1801 int lmv_create(struct obd_export *exp, struct md_op_data *op_data,
1802                const void *data, int datalen, int mode, __u32 uid,
1803                __u32 gid, cfs_cap_t cap_effective, __u64 rdev,
1804                struct ptlrpc_request **request)
1805 {
1806         struct obd_device       *obd = exp->exp_obd;
1807         struct lmv_obd          *lmv = &obd->u.lmv;
1808         struct lmv_tgt_desc     *tgt;
1809         int                      rc;
1810         ENTRY;
1811
1812         rc = lmv_check_connect(obd);
1813         if (rc)
1814                 RETURN(rc);
1815
1816         if (!lmv->desc.ld_active_tgt_count)
1817                 RETURN(-EIO);
1818
1819         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
1820         if (IS_ERR(tgt))
1821                 RETURN(PTR_ERR(tgt));
1822
1823         CDEBUG(D_INODE, "CREATE name '%.*s' on "DFID" -> mds #%x\n",
1824                op_data->op_namelen, op_data->op_name, PFID(&op_data->op_fid1),
1825                op_data->op_mds);
1826
1827         rc = lmv_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
1828         if (rc)
1829                 RETURN(rc);
1830
1831         /* Send the create request to the MDT where the object
1832          * will be located */
1833         tgt = lmv_find_target(lmv, &op_data->op_fid2);
1834         if (IS_ERR(tgt))
1835                 RETURN(PTR_ERR(tgt));
1836
1837         op_data->op_mds = tgt->ltd_idx;
1838
1839         CDEBUG(D_INODE, "CREATE obj "DFID" -> mds #%x\n",
1840                PFID(&op_data->op_fid2), op_data->op_mds);
1841
1842         op_data->op_flags |= MF_MDC_CANCEL_FID1;
1843         rc = md_create(tgt->ltd_exp, op_data, data, datalen, mode, uid, gid,
1844                        cap_effective, rdev, request);
1845         if (rc == 0) {
1846                 if (*request == NULL)
1847                         RETURN(rc);
1848                 CDEBUG(D_INODE, "Created - "DFID"\n", PFID(&op_data->op_fid2));
1849         }
1850         RETURN(rc);
1851 }
1852
1853 static int lmv_done_writing(struct obd_export *exp,
1854                             struct md_op_data *op_data,
1855                             struct md_open_data *mod)
1856 {
1857         struct obd_device     *obd = exp->exp_obd;
1858         struct lmv_obd        *lmv = &obd->u.lmv;
1859         struct lmv_tgt_desc   *tgt;
1860         int                    rc;
1861         ENTRY;
1862
1863         rc = lmv_check_connect(obd);
1864         if (rc)
1865                 RETURN(rc);
1866
1867         tgt = lmv_find_target(lmv, &op_data->op_fid1);
1868         if (IS_ERR(tgt))
1869                 RETURN(PTR_ERR(tgt));
1870
1871         rc = md_done_writing(tgt->ltd_exp, op_data, mod);
1872         RETURN(rc);
1873 }
1874
1875 static int
1876 lmv_enqueue_remote(struct obd_export *exp, struct ldlm_enqueue_info *einfo,
1877                    struct lookup_intent *it, struct md_op_data *op_data,
1878                    struct lustre_handle *lockh, void *lmm, int lmmsize,
1879                    __u64 extra_lock_flags)
1880 {
1881         struct ptlrpc_request      *req = it->d.lustre.it_data;
1882         struct obd_device          *obd = exp->exp_obd;
1883         struct lmv_obd             *lmv = &obd->u.lmv;
1884         struct lustre_handle        plock;
1885         struct lmv_tgt_desc        *tgt;
1886         struct md_op_data          *rdata;
1887         struct lu_fid               fid1;
1888         struct mdt_body            *body;
1889         int                         rc = 0;
1890         int                         pmode;
1891         ENTRY;
1892
1893         body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
1894         LASSERT(body != NULL);
1895
1896         if (!(body->valid & OBD_MD_MDS))
1897                 RETURN(0);
1898
1899         CDEBUG(D_INODE, "REMOTE_ENQUEUE '%s' on "DFID" -> "DFID"\n",
1900                LL_IT2STR(it), PFID(&op_data->op_fid1), PFID(&body->fid1));
1901
1902         /*
1903          * We got LOOKUP lock, but we really need attrs.
1904          */
1905         pmode = it->d.lustre.it_lock_mode;
1906         LASSERT(pmode != 0);
1907         memcpy(&plock, lockh, sizeof(plock));
1908         it->d.lustre.it_lock_mode = 0;
1909         it->d.lustre.it_data = NULL;
1910         fid1 = body->fid1;
1911
1912         ptlrpc_req_finished(req);
1913
1914         tgt = lmv_find_target(lmv, &fid1);
1915         if (IS_ERR(tgt))
1916                 GOTO(out, rc = PTR_ERR(tgt));
1917
1918         OBD_ALLOC_PTR(rdata);
1919         if (rdata == NULL)
1920                 GOTO(out, rc = -ENOMEM);
1921
1922         rdata->op_fid1 = fid1;
1923         rdata->op_bias = MDS_CROSS_REF;
1924
1925         rc = md_enqueue(tgt->ltd_exp, einfo, it, rdata, lockh,
1926                         lmm, lmmsize, NULL, extra_lock_flags);
1927         OBD_FREE_PTR(rdata);
1928         EXIT;
1929 out:
1930         ldlm_lock_decref(&plock, pmode);
1931         return rc;
1932 }
1933
1934 static int
1935 lmv_enqueue(struct obd_export *exp, struct ldlm_enqueue_info *einfo,
1936             struct lookup_intent *it, struct md_op_data *op_data,
1937             struct lustre_handle *lockh, void *lmm, int lmmsize,
1938             struct ptlrpc_request **req, __u64 extra_lock_flags)
1939 {
1940         struct obd_device        *obd = exp->exp_obd;
1941         struct lmv_obd           *lmv = &obd->u.lmv;
1942         struct lmv_tgt_desc      *tgt;
1943         int                       rc;
1944         ENTRY;
1945
1946         rc = lmv_check_connect(obd);
1947         if (rc)
1948                 RETURN(rc);
1949
1950         CDEBUG(D_INODE, "ENQUEUE '%s' on "DFID"\n",
1951                LL_IT2STR(it), PFID(&op_data->op_fid1));
1952
1953         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
1954         if (IS_ERR(tgt))
1955                 RETURN(PTR_ERR(tgt));
1956
1957         CDEBUG(D_INODE, "ENQUEUE '%s' on "DFID" -> mds #%d\n",
1958                LL_IT2STR(it), PFID(&op_data->op_fid1), tgt->ltd_idx);
1959
1960         rc = md_enqueue(tgt->ltd_exp, einfo, it, op_data, lockh,
1961                         lmm, lmmsize, req, extra_lock_flags);
1962
1963         if (rc == 0 && it && it->it_op == IT_OPEN) {
1964                 rc = lmv_enqueue_remote(exp, einfo, it, op_data, lockh,
1965                                         lmm, lmmsize, extra_lock_flags);
1966         }
1967         RETURN(rc);
1968 }
1969
1970 static int
1971 lmv_getattr_name(struct obd_export *exp,struct md_op_data *op_data,
1972                  struct ptlrpc_request **preq)
1973 {
1974         struct ptlrpc_request   *req = NULL;
1975         struct obd_device       *obd = exp->exp_obd;
1976         struct lmv_obd          *lmv = &obd->u.lmv;
1977         struct lmv_tgt_desc     *tgt;
1978         struct mdt_body         *body;
1979         int                      rc;
1980         ENTRY;
1981
1982         rc = lmv_check_connect(obd);
1983         if (rc)
1984                 RETURN(rc);
1985
1986         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
1987         if (IS_ERR(tgt))
1988                 RETURN(PTR_ERR(tgt));
1989
1990         CDEBUG(D_INODE, "GETATTR_NAME for %*s on "DFID" -> mds #%d\n",
1991                op_data->op_namelen, op_data->op_name, PFID(&op_data->op_fid1),
1992                tgt->ltd_idx);
1993
1994         rc = md_getattr_name(tgt->ltd_exp, op_data, preq);
1995         if (rc != 0)
1996                 RETURN(rc);
1997
1998         body = req_capsule_server_get(&(*preq)->rq_pill, &RMF_MDT_BODY);
1999         LASSERT(body != NULL);
2000
2001         if (body->valid & OBD_MD_MDS) {
2002                 struct lu_fid rid = body->fid1;
2003                 CDEBUG(D_INODE, "Request attrs for "DFID"\n",
2004                        PFID(&rid));
2005
2006                 tgt = lmv_find_target(lmv, &rid);
2007                 if (IS_ERR(tgt)) {
2008                         ptlrpc_req_finished(*preq);
2009                         preq = NULL;
2010                         RETURN(PTR_ERR(tgt));
2011                 }
2012
2013                 op_data->op_fid1 = rid;
2014                 op_data->op_valid |= OBD_MD_FLCROSSREF;
2015                 op_data->op_namelen = 0;
2016                 op_data->op_name = NULL;
2017                 rc = md_getattr_name(tgt->ltd_exp, op_data, &req);
2018                 ptlrpc_req_finished(*preq);
2019                 *preq = req;
2020         }
2021
2022         RETURN(rc);
2023 }
2024
2025 #define md_op_data_fid(op_data, fl)                     \
2026         (fl == MF_MDC_CANCEL_FID1 ? &op_data->op_fid1 : \
2027          fl == MF_MDC_CANCEL_FID2 ? &op_data->op_fid2 : \
2028          fl == MF_MDC_CANCEL_FID3 ? &op_data->op_fid3 : \
2029          fl == MF_MDC_CANCEL_FID4 ? &op_data->op_fid4 : \
2030          NULL)
2031
2032 static int lmv_early_cancel(struct obd_export *exp, struct lmv_tgt_desc *tgt,
2033                             struct md_op_data *op_data,
2034                             int op_tgt, ldlm_mode_t mode, int bits, int flag)
2035 {
2036         struct lu_fid          *fid = md_op_data_fid(op_data, flag);
2037         struct obd_device      *obd = exp->exp_obd;
2038         struct lmv_obd         *lmv = &obd->u.lmv;
2039         ldlm_policy_data_t      policy = {{ 0 }};
2040         int                     rc = 0;
2041         ENTRY;
2042
2043         if (!fid_is_sane(fid))
2044                 RETURN(0);
2045
2046         if (tgt == NULL) {
2047                 tgt = lmv_find_target(lmv, fid);
2048                 if (IS_ERR(tgt))
2049                         RETURN(PTR_ERR(tgt));
2050         }
2051
2052         if (tgt->ltd_idx != op_tgt) {
2053                 CDEBUG(D_INODE, "EARLY_CANCEL on "DFID"\n", PFID(fid));
2054                 policy.l_inodebits.bits = bits;
2055                 rc = md_cancel_unused(tgt->ltd_exp, fid, &policy,
2056                                       mode, LCF_ASYNC, NULL);
2057         } else {
2058                 CDEBUG(D_INODE,
2059                        "EARLY_CANCEL skip operation target %d on "DFID"\n",
2060                        op_tgt, PFID(fid));
2061                 op_data->op_flags |= flag;
2062                 rc = 0;
2063         }
2064
2065         RETURN(rc);
2066 }
2067
2068 /*
2069  * llite passes fid of an target inode in op_data->op_fid1 and id of directory in
2070  * op_data->op_fid2
2071  */
2072 static int lmv_link(struct obd_export *exp, struct md_op_data *op_data,
2073                     struct ptlrpc_request **request)
2074 {
2075         struct obd_device       *obd = exp->exp_obd;
2076         struct lmv_obd          *lmv = &obd->u.lmv;
2077         struct lmv_tgt_desc     *tgt;
2078         int                      rc;
2079         ENTRY;
2080
2081         rc = lmv_check_connect(obd);
2082         if (rc)
2083                 RETURN(rc);
2084
2085         LASSERT(op_data->op_namelen != 0);
2086
2087         CDEBUG(D_INODE, "LINK "DFID":%*s to "DFID"\n",
2088                PFID(&op_data->op_fid2), op_data->op_namelen,
2089                op_data->op_name, PFID(&op_data->op_fid1));
2090
2091         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2092         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2093         op_data->op_cap = cfs_curproc_cap_pack();
2094         if (op_data->op_mea2 != NULL) {
2095                 struct lmv_stripe_md    *lsm = op_data->op_mea2;
2096                 const struct lmv_oinfo  *oinfo;
2097
2098                 oinfo = lsm_name_to_stripe_info(lsm, op_data->op_name,
2099                                                 op_data->op_namelen);
2100                 if (IS_ERR(oinfo))
2101                         RETURN(PTR_ERR(oinfo));
2102
2103                 op_data->op_fid2 = oinfo->lmo_fid;
2104         }
2105
2106         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid2);
2107         if (IS_ERR(tgt))
2108                 RETURN(PTR_ERR(tgt));
2109
2110         /*
2111          * Cancel UPDATE lock on child (fid1).
2112          */
2113         op_data->op_flags |= MF_MDC_CANCEL_FID2;
2114         rc = lmv_early_cancel(exp, NULL, op_data, tgt->ltd_idx, LCK_EX,
2115                               MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID1);
2116         if (rc != 0)
2117                 RETURN(rc);
2118
2119         rc = md_link(tgt->ltd_exp, op_data, request);
2120
2121         RETURN(rc);
2122 }
2123
2124 static int lmv_rename(struct obd_export *exp, struct md_op_data *op_data,
2125                       const char *old, int oldlen, const char *new, int newlen,
2126                       struct ptlrpc_request **request)
2127 {
2128         struct obd_device       *obd = exp->exp_obd;
2129         struct lmv_obd          *lmv = &obd->u.lmv;
2130         struct lmv_tgt_desc     *src_tgt;
2131         int                     rc;
2132         ENTRY;
2133
2134         LASSERT(oldlen != 0);
2135
2136         CDEBUG(D_INODE, "RENAME %.*s in "DFID":%d to %.*s in "DFID":%d\n",
2137                oldlen, old, PFID(&op_data->op_fid1),
2138                op_data->op_mea1 ? op_data->op_mea1->lsm_md_stripe_count : 0,
2139                newlen, new, PFID(&op_data->op_fid2),
2140                op_data->op_mea2 ? op_data->op_mea2->lsm_md_stripe_count : 0);
2141
2142         rc = lmv_check_connect(obd);
2143         if (rc)
2144                 RETURN(rc);
2145
2146         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2147         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2148         op_data->op_cap = cfs_curproc_cap_pack();
2149         if (op_data->op_cli_flags & CLI_MIGRATE) {
2150                 LASSERTF(fid_is_sane(&op_data->op_fid3), "invalid FID "DFID"\n",
2151                          PFID(&op_data->op_fid3));
2152                 rc = lmv_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
2153                 if (rc)
2154                         RETURN(rc);
2155                 src_tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid3);
2156         } else {
2157                 if (op_data->op_mea1 != NULL) {
2158                         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2159
2160                         src_tgt = lmv_locate_target_for_name(lmv, lsm, old,
2161                                                              oldlen,
2162                                                              &op_data->op_fid1,
2163                                                              &op_data->op_mds);
2164                         if (IS_ERR(src_tgt))
2165                                 RETURN(PTR_ERR(src_tgt));
2166                 } else {
2167                         src_tgt = lmv_find_target(lmv, &op_data->op_fid1);
2168                         if (IS_ERR(src_tgt))
2169                                 RETURN(PTR_ERR(src_tgt));
2170
2171                         op_data->op_mds = src_tgt->ltd_idx;
2172                 }
2173
2174                 if (op_data->op_mea2) {
2175                         struct lmv_stripe_md    *lsm = op_data->op_mea2;
2176                         const struct lmv_oinfo  *oinfo;
2177
2178                         oinfo = lsm_name_to_stripe_info(lsm, new, newlen);
2179                         if (IS_ERR(oinfo))
2180                                 RETURN(PTR_ERR(oinfo));
2181
2182                         op_data->op_fid2 = oinfo->lmo_fid;
2183                 }
2184         }
2185         if (IS_ERR(src_tgt))
2186                 RETURN(PTR_ERR(src_tgt));
2187
2188         /*
2189          * LOOKUP lock on src child (fid3) should also be cancelled for
2190          * src_tgt in mdc_rename.
2191          */
2192         op_data->op_flags |= MF_MDC_CANCEL_FID1 | MF_MDC_CANCEL_FID3;
2193
2194         /*
2195          * Cancel UPDATE locks on tgt parent (fid2), tgt_tgt is its
2196          * own target.
2197          */
2198         rc = lmv_early_cancel(exp, NULL, op_data, src_tgt->ltd_idx,
2199                               LCK_EX, MDS_INODELOCK_UPDATE,
2200                               MF_MDC_CANCEL_FID2);
2201
2202         if (rc != 0)
2203                 RETURN(rc);
2204         /*
2205          * Cancel LOOKUP locks on source child (fid3) for parent tgt_tgt.
2206          */
2207         if (fid_is_sane(&op_data->op_fid3)) {
2208                 struct lmv_tgt_desc *tgt;
2209
2210                 tgt = lmv_find_target(lmv, &op_data->op_fid1);
2211                 if (IS_ERR(tgt))
2212                         RETURN(PTR_ERR(tgt));
2213
2214                 /* Cancel LOOKUP lock on its parent */
2215                 rc = lmv_early_cancel(exp, tgt, op_data, src_tgt->ltd_idx,
2216                                       LCK_EX, MDS_INODELOCK_LOOKUP,
2217                                       MF_MDC_CANCEL_FID3);
2218                 if (rc != 0)
2219                         RETURN(rc);
2220
2221                 rc = lmv_early_cancel(exp, NULL, op_data, src_tgt->ltd_idx,
2222                                       LCK_EX, MDS_INODELOCK_FULL,
2223                                       MF_MDC_CANCEL_FID3);
2224                 if (rc != 0)
2225                         RETURN(rc);
2226         }
2227
2228         /*
2229          * Cancel all the locks on tgt child (fid4).
2230          */
2231         if (fid_is_sane(&op_data->op_fid4))
2232                 rc = lmv_early_cancel(exp, NULL, op_data, src_tgt->ltd_idx,
2233                                       LCK_EX, MDS_INODELOCK_FULL,
2234                                       MF_MDC_CANCEL_FID4);
2235
2236         CDEBUG(D_INODE, DFID":m%d to "DFID"\n", PFID(&op_data->op_fid1),
2237                op_data->op_mds, PFID(&op_data->op_fid2));
2238
2239         rc = md_rename(src_tgt->ltd_exp, op_data, old, oldlen, new, newlen,
2240                        request);
2241
2242         RETURN(rc);
2243 }
2244
2245 static int lmv_setattr(struct obd_export *exp, struct md_op_data *op_data,
2246                        void *ea, int ealen, void *ea2, int ea2len,
2247                        struct ptlrpc_request **request,
2248                        struct md_open_data **mod)
2249 {
2250         struct obd_device       *obd = exp->exp_obd;
2251         struct lmv_obd          *lmv = &obd->u.lmv;
2252         struct lmv_tgt_desc     *tgt;
2253         int                      rc = 0;
2254         ENTRY;
2255
2256         rc = lmv_check_connect(obd);
2257         if (rc)
2258                 RETURN(rc);
2259
2260         CDEBUG(D_INODE, "SETATTR for "DFID", valid 0x%x\n",
2261                PFID(&op_data->op_fid1), op_data->op_attr.ia_valid);
2262
2263         op_data->op_flags |= MF_MDC_CANCEL_FID1;
2264         tgt = lmv_find_target(lmv, &op_data->op_fid1);
2265         if (IS_ERR(tgt))
2266                 RETURN(PTR_ERR(tgt));
2267
2268         rc = md_setattr(tgt->ltd_exp, op_data, ea, ealen, ea2,
2269                         ea2len, request, mod);
2270
2271         RETURN(rc);
2272 }
2273
2274 static int lmv_fsync(struct obd_export *exp, const struct lu_fid *fid,
2275                      struct obd_capa *oc, struct ptlrpc_request **request)
2276 {
2277         struct obd_device       *obd = exp->exp_obd;
2278         struct lmv_obd          *lmv = &obd->u.lmv;
2279         struct lmv_tgt_desc     *tgt;
2280         int                      rc;
2281         ENTRY;
2282
2283         rc = lmv_check_connect(obd);
2284         if (rc != 0)
2285                 RETURN(rc);
2286
2287         tgt = lmv_find_target(lmv, fid);
2288         if (IS_ERR(tgt))
2289                 RETURN(PTR_ERR(tgt));
2290
2291         rc = md_fsync(tgt->ltd_exp, fid, oc, request);
2292         RETURN(rc);
2293 }
2294
2295 /*
2296  * Adjust a set of pages, each page containing an array of lu_dirpages,
2297  * so that each page can be used as a single logical lu_dirpage.
2298  *
2299  * A lu_dirpage is laid out as follows, where s = ldp_hash_start,
2300  * e = ldp_hash_end, f = ldp_flags, p = padding, and each "ent" is a
2301  * struct lu_dirent.  It has size up to LU_PAGE_SIZE. The ldp_hash_end
2302  * value is used as a cookie to request the next lu_dirpage in a
2303  * directory listing that spans multiple pages (two in this example):
2304  *   ________
2305  *  |        |
2306  * .|--------v-------   -----.
2307  * |s|e|f|p|ent|ent| ... |ent|
2308  * '--|--------------   -----'   Each CFS_PAGE contains a single
2309  *    '------.                   lu_dirpage.
2310  * .---------v-------   -----.
2311  * |s|e|f|p|ent| 0 | ... | 0 |
2312  * '-----------------   -----'
2313  *
2314  * However, on hosts where the native VM page size (PAGE_CACHE_SIZE) is
2315  * larger than LU_PAGE_SIZE, a single host page may contain multiple
2316  * lu_dirpages. After reading the lu_dirpages from the MDS, the
2317  * ldp_hash_end of the first lu_dirpage refers to the one immediately
2318  * after it in the same CFS_PAGE (arrows simplified for brevity, but
2319  * in general e0==s1, e1==s2, etc.):
2320  *
2321  * .--------------------   -----.
2322  * |s0|e0|f0|p|ent|ent| ... |ent|
2323  * |---v----------------   -----|
2324  * |s1|e1|f1|p|ent|ent| ... |ent|
2325  * |---v----------------   -----|  Here, each CFS_PAGE contains
2326  *             ...                 multiple lu_dirpages.
2327  * |---v----------------   -----|
2328  * |s'|e'|f'|p|ent|ent| ... |ent|
2329  * '---|----------------   -----'
2330  *     v
2331  * .----------------------------.
2332  * |        next CFS_PAGE       |
2333  *
2334  * This structure is transformed into a single logical lu_dirpage as follows:
2335  *
2336  * - Replace e0 with e' so the request for the next lu_dirpage gets the page
2337  *   labeled 'next CFS_PAGE'.
2338  *
2339  * - Copy the LDF_COLLIDE flag from f' to f0 to correctly reflect whether
2340  *   a hash collision with the next page exists.
2341  *
2342  * - Adjust the lde_reclen of the ending entry of each lu_dirpage to span
2343  *   to the first entry of the next lu_dirpage.
2344  */
2345 #if PAGE_CACHE_SIZE > LU_PAGE_SIZE
2346 static void lmv_adjust_dirpages(struct page **pages, int ncfspgs, int nlupgs)
2347 {
2348         int i;
2349
2350         for (i = 0; i < ncfspgs; i++) {
2351                 struct lu_dirpage       *dp = kmap(pages[i]);
2352                 struct lu_dirpage       *first = dp;
2353                 struct lu_dirent        *end_dirent = NULL;
2354                 struct lu_dirent        *ent;
2355                 __u64                   hash_end = dp->ldp_hash_end;
2356                 __u32                   flags = dp->ldp_flags;
2357
2358                 while (--nlupgs > 0) {
2359                         ent = lu_dirent_start(dp);
2360                         for (end_dirent = ent; ent != NULL;
2361                              end_dirent = ent, ent = lu_dirent_next(ent));
2362
2363                         /* Advance dp to next lu_dirpage. */
2364                         dp = (struct lu_dirpage *)((char *)dp + LU_PAGE_SIZE);
2365
2366                         /* Check if we've reached the end of the CFS_PAGE. */
2367                         if (!((unsigned long)dp & ~CFS_PAGE_MASK))
2368                                 break;
2369
2370                         /* Save the hash and flags of this lu_dirpage. */
2371                         hash_end = dp->ldp_hash_end;
2372                         flags = dp->ldp_flags;
2373
2374                         /* Check if lu_dirpage contains no entries. */
2375                         if (!end_dirent)
2376                                 break;
2377
2378                         /* Enlarge the end entry lde_reclen from 0 to
2379                          * first entry of next lu_dirpage. */
2380                         LASSERT(le16_to_cpu(end_dirent->lde_reclen) == 0);
2381                         end_dirent->lde_reclen =
2382                                 cpu_to_le16((char *)(dp->ldp_entries) -
2383                                             (char *)end_dirent);
2384                 }
2385
2386                 first->ldp_hash_end = hash_end;
2387                 first->ldp_flags &= ~cpu_to_le32(LDF_COLLIDE);
2388                 first->ldp_flags |= flags & cpu_to_le32(LDF_COLLIDE);
2389
2390                 kunmap(pages[i]);
2391         }
2392         LASSERTF(nlupgs == 0, "left = %d", nlupgs);
2393 }
2394 #else
2395 #define lmv_adjust_dirpages(pages, ncfspgs, nlupgs) do {} while (0)
2396 #endif  /* PAGE_CACHE_SIZE > LU_PAGE_SIZE */
2397
2398 #define NORMAL_MAX_STRIPES 4
2399 int lmv_read_entry(struct obd_export *exp, struct md_op_data *op_data,
2400                    struct md_callback *cb_op, struct lu_dirent **ldp,
2401                    struct page **ppage)
2402 {
2403         struct obd_device       *obd = exp->exp_obd;
2404         struct lmv_obd          *lmv = &obd->u.lmv;
2405         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2406         struct lu_dirent        *tmp_ents[NORMAL_MAX_STRIPES];
2407         struct lu_dirent        **ents = NULL;
2408         int                     stripe_count;
2409         __u64                   min_hash;
2410         int                     min_idx = 0;
2411         struct page             *min_page = NULL;
2412         int                     i;
2413         int                     rc;
2414         ENTRY;
2415
2416         rc = lmv_check_connect(obd);
2417         if (rc)
2418                 RETURN(rc);
2419
2420         if (lsm == NULL)
2421                 stripe_count = 1;
2422         else
2423                 stripe_count = lsm->lsm_md_stripe_count;
2424
2425         if (stripe_count > NORMAL_MAX_STRIPES) {
2426                 OBD_ALLOC(ents, sizeof(ents[0]) * stripe_count);
2427                 if (ents == NULL)
2428                         GOTO(out, rc = -ENOMEM);
2429         } else {
2430                 ents = tmp_ents;
2431                 memset(ents, 0, sizeof(ents[0]) * stripe_count);
2432         }
2433
2434         min_hash = MDS_DIR_END_OFF;
2435         for (i = 0; i < stripe_count; i++) {
2436                 struct lmv_tgt_desc *tgt;
2437                 struct page *page = NULL;
2438
2439                 if (likely(lsm == NULL)) {
2440                         tgt = lmv_find_target(lmv, &op_data->op_fid1);
2441                         if (IS_ERR(tgt))
2442                                 GOTO(out, rc = PTR_ERR(tgt));
2443                         LASSERT(op_data->op_data != NULL);
2444                 } else {
2445                         tgt = lmv_get_target(lmv, lsm->lsm_md_oinfo[i].lmo_mds);
2446                         if (IS_ERR(tgt))
2447                                 GOTO(out, rc = PTR_ERR(tgt));
2448                         op_data->op_fid1 = lsm->lsm_md_oinfo[i].lmo_fid;
2449                         op_data->op_fid2 = lsm->lsm_md_oinfo[i].lmo_fid;
2450                         op_data->op_stripe_offset = i;
2451                 }
2452
2453                 rc = md_read_entry(tgt->ltd_exp, op_data, cb_op, &ents[i],
2454                                    &page);
2455                 if (rc != 0)
2456                         GOTO(out, rc);
2457
2458                 if (ents[i] != NULL &&
2459                     le64_to_cpu(ents[i]->lde_hash) <= min_hash) {
2460                         if (min_page != NULL)
2461                                 page_cache_release(min_page);
2462                         min_page = page;
2463                         min_hash = le64_to_cpu(ents[i]->lde_hash);
2464                         min_idx = i;
2465                 }
2466         }
2467
2468         if (min_hash != MDS_DIR_END_OFF)
2469                 *ldp = ents[min_idx];
2470         else
2471                 *ldp = NULL;
2472 out:
2473         if (stripe_count > NORMAL_MAX_STRIPES && ents != NULL)
2474                 OBD_FREE(ents, sizeof(ents[0]) * stripe_count);
2475
2476         if (rc != 0 && min_page != NULL) {
2477                 kunmap(min_page);
2478                 page_cache_release(min_page);
2479         } else {
2480                 *ppage = min_page;
2481         }
2482
2483         RETURN(rc);
2484 }
2485
2486 static int lmv_unlink(struct obd_export *exp, struct md_op_data *op_data,
2487                       struct ptlrpc_request **request)
2488 {
2489         struct obd_device       *obd = exp->exp_obd;
2490         struct lmv_obd          *lmv = &obd->u.lmv;
2491         struct lmv_tgt_desc     *tgt = NULL;
2492         struct lmv_tgt_desc     *parent_tgt = NULL;
2493         struct mdt_body         *body;
2494         int                     rc;
2495         ENTRY;
2496
2497         rc = lmv_check_connect(obd);
2498         if (rc)
2499                 RETURN(rc);
2500 retry:
2501         /* Send unlink requests to the MDT where the child is located */
2502         if (likely(!fid_is_zero(&op_data->op_fid2))) {
2503                 tgt = lmv_find_target(lmv, &op_data->op_fid2);
2504                 if (IS_ERR(tgt))
2505                         RETURN(PTR_ERR(tgt));
2506
2507                 /* For striped dir, we need to locate the parent as well */
2508                 if (op_data->op_mea1 != NULL) {
2509                         struct lmv_tgt_desc *tmp;
2510
2511                         LASSERT(op_data->op_name != NULL &&
2512                                 op_data->op_namelen != 0);
2513                         tmp = lmv_locate_target_for_name(lmv,
2514                                                    op_data->op_mea1,
2515                                                    op_data->op_name,
2516                                                    op_data->op_namelen,
2517                                                    &op_data->op_fid1,
2518                                                    &op_data->op_mds);
2519                         if (IS_ERR(tmp))
2520                                 RETURN(PTR_ERR(tmp));
2521                 }
2522         } else {
2523                 tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
2524                 if (IS_ERR(tgt))
2525                         RETURN(PTR_ERR(tgt));
2526         }
2527
2528         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2529         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2530         op_data->op_cap = cfs_curproc_cap_pack();
2531
2532         /*
2533          * If child's fid is given, cancel unused locks for it if it is from
2534          * another export than parent.
2535          *
2536          * LOOKUP lock for child (fid3) should also be cancelled on parent
2537          * tgt_tgt in mdc_unlink().
2538          */
2539         op_data->op_flags |= MF_MDC_CANCEL_FID1 | MF_MDC_CANCEL_FID3;
2540
2541         /*
2542          * Cancel FULL locks on child (fid3).
2543          */
2544         parent_tgt = lmv_find_target(lmv, &op_data->op_fid1);
2545         if (IS_ERR(parent_tgt))
2546                 RETURN(PTR_ERR(parent_tgt));
2547
2548         if (parent_tgt != tgt) {
2549                 rc = lmv_early_cancel(exp, parent_tgt, op_data, tgt->ltd_idx,
2550                                       LCK_EX, MDS_INODELOCK_LOOKUP,
2551                                       MF_MDC_CANCEL_FID3);
2552         }
2553
2554         rc = lmv_early_cancel(exp, NULL, op_data, tgt->ltd_idx, LCK_EX,
2555                               MDS_INODELOCK_FULL, MF_MDC_CANCEL_FID3);
2556         if (rc != 0)
2557                 RETURN(rc);
2558
2559         CDEBUG(D_INODE, "unlink with fid="DFID"/"DFID" -> mds #%d\n",
2560                PFID(&op_data->op_fid1), PFID(&op_data->op_fid2), tgt->ltd_idx);
2561
2562         rc = md_unlink(tgt->ltd_exp, op_data, request);
2563         if (rc != 0 && rc != -EREMOTE)
2564                 RETURN(rc);
2565
2566         body = req_capsule_server_get(&(*request)->rq_pill, &RMF_MDT_BODY);
2567         if (body == NULL)
2568                 RETURN(-EPROTO);
2569
2570         /* Not cross-ref case, just get out of here. */
2571         if (likely(!(body->valid & OBD_MD_MDS)))
2572                 RETURN(0);
2573
2574         CDEBUG(D_INODE, "%s: try unlink to another MDT for "DFID"\n",
2575                exp->exp_obd->obd_name, PFID(&body->fid1));
2576
2577         /* This is a remote object, try remote MDT, Note: it may
2578          * try more than 1 time here, Considering following case
2579          * /mnt/lustre is root on MDT0, remote1 is on MDT1
2580          * 1. Initially A does not know where remote1 is, it send
2581          *    unlink RPC to MDT0, MDT0 return -EREMOTE, it will
2582          *    resend unlink RPC to MDT1 (retry 1st time).
2583          *
2584          * 2. During the unlink RPC in flight,
2585          *    client B mv /mnt/lustre/remote1 /mnt/lustre/remote2
2586          *    and create new remote1, but on MDT0
2587          *
2588          * 3. MDT1 get unlink RPC(from A), then do remote lock on
2589          *    /mnt/lustre, then lookup get fid of remote1, and find
2590          *    it is remote dir again, and replay -EREMOTE again.
2591          *
2592          * 4. Then A will resend unlink RPC to MDT0. (retry 2nd times).
2593          *
2594          * In theory, it might try unlimited time here, but it should
2595          * be very rare case.  */
2596         op_data->op_fid2 = body->fid1;
2597         ptlrpc_req_finished(*request);
2598         *request = NULL;
2599
2600         goto retry;
2601 }
2602
2603 static int lmv_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
2604 {
2605         struct lmv_obd *lmv = &obd->u.lmv;
2606         int rc = 0;
2607
2608         switch (stage) {
2609         case OBD_CLEANUP_EARLY:
2610                 /* XXX: here should be calling obd_precleanup() down to
2611                  * stack. */
2612                 break;
2613         case OBD_CLEANUP_EXPORTS:
2614                 fld_client_proc_fini(&lmv->lmv_fld);
2615                 lprocfs_obd_cleanup(obd);
2616                 lprocfs_free_md_stats(obd);
2617                 break;
2618         default:
2619                 break;
2620         }
2621         RETURN(rc);
2622 }
2623
2624 static int lmv_get_info(const struct lu_env *env, struct obd_export *exp,
2625                         __u32 keylen, void *key, __u32 *vallen, void *val,
2626                         struct lov_stripe_md *lsm)
2627 {
2628         struct obd_device       *obd;
2629         struct lmv_obd          *lmv;
2630         int                      rc = 0;
2631         ENTRY;
2632
2633         obd = class_exp2obd(exp);
2634         if (obd == NULL) {
2635                 CDEBUG(D_IOCTL, "Invalid client cookie "LPX64"\n",
2636                        exp->exp_handle.h_cookie);
2637                 RETURN(-EINVAL);
2638         }
2639
2640         lmv = &obd->u.lmv;
2641         if (keylen >= strlen("remote_flag") && !strcmp(key, "remote_flag")) {
2642                 int i;
2643
2644                 rc = lmv_check_connect(obd);
2645                 if (rc)
2646                         RETURN(rc);
2647
2648                 LASSERT(*vallen == sizeof(__u32));
2649                 for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2650                         struct lmv_tgt_desc *tgt = lmv->tgts[i];
2651                         /*
2652                          * All tgts should be connected when this gets called.
2653                          */
2654                         if (tgt == NULL || tgt->ltd_exp == NULL)
2655                                 continue;
2656
2657                         if (!obd_get_info(env, tgt->ltd_exp, keylen, key,
2658                                           vallen, val, NULL))
2659                                 RETURN(0);
2660                 }
2661                 RETURN(-EINVAL);
2662         } else if (KEY_IS(KEY_MAX_EASIZE) ||
2663                    KEY_IS(KEY_DEFAULT_EASIZE) ||
2664                    KEY_IS(KEY_MAX_COOKIESIZE) ||
2665                    KEY_IS(KEY_DEFAULT_COOKIESIZE) ||
2666                    KEY_IS(KEY_CONN_DATA)) {
2667                 rc = lmv_check_connect(obd);
2668                 if (rc)
2669                         RETURN(rc);
2670
2671                 /*
2672                  * Forwarding this request to first MDS, it should know LOV
2673                  * desc.
2674                  */
2675                 rc = obd_get_info(env, lmv->tgts[0]->ltd_exp, keylen, key,
2676                                   vallen, val, NULL);
2677                 if (!rc && KEY_IS(KEY_CONN_DATA))
2678                         exp->exp_connect_data = *(struct obd_connect_data *)val;
2679                 RETURN(rc);
2680         } else if (KEY_IS(KEY_TGT_COUNT)) {
2681                 *((int *)val) = lmv->desc.ld_tgt_count;
2682                 RETURN(0);
2683         }
2684
2685         CDEBUG(D_IOCTL, "Invalid key\n");
2686         RETURN(-EINVAL);
2687 }
2688
2689 int lmv_set_info_async(const struct lu_env *env, struct obd_export *exp,
2690                        obd_count keylen, void *key, obd_count vallen,
2691                        void *val, struct ptlrpc_request_set *set)
2692 {
2693         struct lmv_tgt_desc    *tgt = NULL;
2694         struct obd_device      *obd;
2695         struct lmv_obd         *lmv;
2696         int rc = 0;
2697         ENTRY;
2698
2699         obd = class_exp2obd(exp);
2700         if (obd == NULL) {
2701                 CDEBUG(D_IOCTL, "Invalid client cookie "LPX64"\n",
2702                        exp->exp_handle.h_cookie);
2703                 RETURN(-EINVAL);
2704         }
2705         lmv = &obd->u.lmv;
2706
2707         if (KEY_IS(KEY_READ_ONLY) || KEY_IS(KEY_FLUSH_CTX)) {
2708                 int i, err = 0;
2709
2710                 for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2711                         tgt = lmv->tgts[i];
2712
2713                         if (tgt == NULL || tgt->ltd_exp == NULL)
2714                                 continue;
2715
2716                         err = obd_set_info_async(env, tgt->ltd_exp,
2717                                                  keylen, key, vallen, val, set);
2718                         if (err && rc == 0)
2719                                 rc = err;
2720                 }
2721
2722                 RETURN(rc);
2723         }
2724
2725         RETURN(-EINVAL);
2726 }
2727
2728 static int lmv_pack_md_v1(const struct lmv_stripe_md *lsm,
2729                           struct lmv_mds_md_v1 *lmm1)
2730 {
2731         int     cplen;
2732         int     i;
2733
2734         lmm1->lmv_magic = cpu_to_le32(lsm->lsm_md_magic);
2735         lmm1->lmv_stripe_count = cpu_to_le32(lsm->lsm_md_stripe_count);
2736         lmm1->lmv_master_mdt_index = cpu_to_le32(lsm->lsm_md_master_mdt_index);
2737         lmm1->lmv_hash_type = cpu_to_le32(lsm->lsm_md_hash_type);
2738         cplen = strlcpy(lmm1->lmv_pool_name, lsm->lsm_md_pool_name,
2739                         sizeof(lmm1->lmv_pool_name));
2740         if (cplen >= sizeof(lmm1->lmv_pool_name))
2741                 return -E2BIG;
2742
2743         for (i = 0; i < lsm->lsm_md_stripe_count; i++)
2744                 fid_cpu_to_le(&lmm1->lmv_stripe_fids[i],
2745                               &lsm->lsm_md_oinfo[i].lmo_fid);
2746         return 0;
2747 }
2748
2749 int lmv_pack_md(union lmv_mds_md **lmmp, const struct lmv_stripe_md *lsm,
2750                 int stripe_count)
2751 {
2752         int     lmm_size = 0;
2753         bool    allocated = false;
2754         int     rc = 0;
2755         ENTRY;
2756
2757         LASSERT(lmmp != NULL);
2758         /* Free lmm */
2759         if (*lmmp != NULL && lsm == NULL) {
2760                 int stripe_count;
2761
2762                 stripe_count = lmv_mds_md_stripe_count_get(*lmmp);
2763                 lmm_size = lmv_mds_md_size(stripe_count,
2764                                            le32_to_cpu((*lmmp)->lmv_magic));
2765                 if (lmm_size == 0)
2766                         RETURN(-EINVAL);
2767                 OBD_FREE(*lmmp, lmm_size);
2768                 *lmmp = NULL;
2769                 RETURN(0);
2770         }
2771
2772         /* Alloc lmm */
2773         if (*lmmp == NULL && lsm == NULL) {
2774                 lmm_size = lmv_mds_md_size(stripe_count, LMV_MAGIC);
2775                 LASSERT(lmm_size > 0);
2776                 OBD_ALLOC(*lmmp, lmm_size);
2777                 if (*lmmp == NULL)
2778                         RETURN(-ENOMEM);
2779                 lmv_mds_md_stripe_count_set(*lmmp, stripe_count);
2780                 (*lmmp)->lmv_magic = cpu_to_le32(LMV_MAGIC);
2781                 RETURN(lmm_size);
2782         }
2783
2784         /* pack lmm */
2785         LASSERT(lsm != NULL);
2786         lmm_size = lmv_mds_md_size(lsm->lsm_md_stripe_count, lsm->lsm_md_magic);
2787         if (*lmmp == NULL) {
2788                 OBD_ALLOC(*lmmp, lmm_size);
2789                 if (*lmmp == NULL)
2790                         RETURN(-ENOMEM);
2791                 allocated = true;
2792         }
2793
2794         switch (lsm->lsm_md_magic) {
2795         case LMV_MAGIC_V1:
2796                 rc = lmv_pack_md_v1(lsm, &(*lmmp)->lmv_md_v1);
2797                 break;
2798         default:
2799                 rc = -EINVAL;
2800                 break;
2801         }
2802
2803         if (rc != 0 && allocated) {
2804                 OBD_FREE(*lmmp, lmm_size);
2805                 *lmmp = NULL;
2806         }
2807
2808         RETURN(lmm_size);
2809 }
2810 EXPORT_SYMBOL(lmv_pack_md);
2811
2812 static int lmv_unpack_md_v1(struct obd_export *exp, struct lmv_stripe_md *lsm,
2813                             const struct lmv_mds_md_v1 *lmm1)
2814 {
2815         struct lmv_obd  *lmv = &exp->exp_obd->u.lmv;
2816         int             stripe_count;
2817         int             cplen;
2818         int             i;
2819         int             rc = 0;
2820         ENTRY;
2821
2822         lsm->lsm_md_magic = le32_to_cpu(lmm1->lmv_magic);
2823         lsm->lsm_md_stripe_count = le32_to_cpu(lmm1->lmv_stripe_count);
2824         lsm->lsm_md_master_mdt_index = le32_to_cpu(lmm1->lmv_master_mdt_index);
2825         lsm->lsm_md_hash_type = le32_to_cpu(lmm1->lmv_hash_type);
2826         lsm->lsm_md_layout_version = le32_to_cpu(lmm1->lmv_layout_version);
2827         fid_le_to_cpu(&lsm->lsm_md_master_fid, &lmm1->lmv_master_fid);
2828         cplen = strlcpy(lsm->lsm_md_pool_name, lmm1->lmv_pool_name,
2829                         sizeof(lsm->lsm_md_pool_name));
2830
2831         if (!fid_is_sane(&lsm->lsm_md_master_fid))
2832                 RETURN(-EPROTO);
2833
2834         if (cplen >= sizeof(lsm->lsm_md_pool_name))
2835                 RETURN(-E2BIG);
2836
2837         CDEBUG(D_INFO, "unpack lsm count %d, master %d hash_type %d"
2838                "layout_version %d\n", lsm->lsm_md_stripe_count,
2839                lsm->lsm_md_master_mdt_index, lsm->lsm_md_hash_type,
2840                lsm->lsm_md_layout_version);
2841
2842         stripe_count = le32_to_cpu(lmm1->lmv_stripe_count);
2843         for (i = 0; i < le32_to_cpu(stripe_count); i++) {
2844                 fid_le_to_cpu(&lsm->lsm_md_oinfo[i].lmo_fid,
2845                               &lmm1->lmv_stripe_fids[i]);
2846                 rc = lmv_fld_lookup(lmv, &lsm->lsm_md_oinfo[i].lmo_fid,
2847                                     &lsm->lsm_md_oinfo[i].lmo_mds);
2848                 if (rc != 0)
2849                         RETURN(rc);
2850                 CDEBUG(D_INFO, "unpack fid #%d "DFID"\n", i,
2851                        PFID(&lsm->lsm_md_oinfo[i].lmo_fid));
2852         }
2853
2854         RETURN(rc);
2855 }
2856
2857 int lmv_unpack_md(struct obd_export *exp, struct lmv_stripe_md **lsmp,
2858                   const union lmv_mds_md *lmm, int stripe_count)
2859 {
2860         struct lmv_stripe_md     *lsm;
2861         int                      lsm_size;
2862         int                      rc;
2863         bool                     allocated = false;
2864         ENTRY;
2865
2866         LASSERT(lsmp != NULL);
2867
2868         lsm = *lsmp;
2869         /* Free memmd */
2870         if (lsm != NULL && lmm == NULL) {
2871 #ifdef __KERNEL__
2872                 int i;
2873                 for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
2874                         /* For migrating inode, the master stripe and master
2875                          * object will be the same, so do not need iput, see
2876                          * ll_update_lsm_md */
2877                         if (!(lsm->lsm_md_hash_type & LMV_HASH_FLAG_MIGRATION &&
2878                               i == 0) && lsm->lsm_md_oinfo[i].lmo_root != NULL)
2879                                 iput(lsm->lsm_md_oinfo[i].lmo_root);
2880                 }
2881 #endif
2882                 lsm_size = lmv_stripe_md_size(lsm->lsm_md_stripe_count);
2883                 OBD_FREE(lsm, lsm_size);
2884                 *lsmp = NULL;
2885                 RETURN(0);
2886         }
2887
2888         /* Alloc memmd */
2889         if (lsm == NULL && lmm == NULL) {
2890                 lsm_size = lmv_stripe_md_size(stripe_count);
2891                 OBD_ALLOC(lsm, lsm_size);
2892                 if (lsm == NULL)
2893                         RETURN(-ENOMEM);
2894                 lsm->lsm_md_stripe_count = stripe_count;
2895                 *lsmp = lsm;
2896                 RETURN(0);
2897         }
2898
2899         /* Unpack memmd */
2900         if (le32_to_cpu(lmm->lmv_magic) != LMV_MAGIC_V1 &&
2901             le32_to_cpu(lmm->lmv_magic) != LMV_USER_MAGIC) {
2902                 CERROR("%s: invalid lmv magic %x: rc = %d\n",
2903                        exp->exp_obd->obd_name, le32_to_cpu(lmm->lmv_magic),
2904                        -EIO);
2905                 RETURN(-EIO);
2906         }
2907
2908         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_V1)
2909                 lsm_size = lmv_stripe_md_size(lmv_mds_md_stripe_count_get(lmm));
2910         else
2911                 /**
2912                  * Unpack default dirstripe(lmv_user_md) to lmv_stripe_md,
2913                  * stripecount should be 0 then.
2914                  */
2915                 lsm_size = lmv_stripe_md_size(0);
2916
2917         lsm_size = lmv_stripe_md_size(lmv_mds_md_stripe_count_get(lmm));
2918         if (lsm == NULL) {
2919                 OBD_ALLOC(lsm, lsm_size);
2920                 if (lsm == NULL)
2921                         RETURN(-ENOMEM);
2922                 allocated = true;
2923                 *lsmp = lsm;
2924         }
2925
2926         switch (le32_to_cpu(lmm->lmv_magic)) {
2927         case LMV_MAGIC_V1:
2928                 rc = lmv_unpack_md_v1(exp, lsm, &lmm->lmv_md_v1);
2929                 break;
2930         default:
2931                 CERROR("%s: unrecognized magic %x\n", exp->exp_obd->obd_name,
2932                        le32_to_cpu(lmm->lmv_magic));
2933                 rc = -EINVAL;
2934                 break;
2935         }
2936
2937         if (rc != 0 && allocated) {
2938                 OBD_FREE(lsm, lsm_size);
2939                 *lsmp = NULL;
2940                 lsm_size = rc;
2941         }
2942         RETURN(lsm_size);
2943 }
2944
2945 int lmv_alloc_memmd(struct lmv_stripe_md **lsmp, int stripes)
2946 {
2947         return lmv_unpack_md(NULL, lsmp, NULL, stripes);
2948 }
2949 EXPORT_SYMBOL(lmv_alloc_memmd);
2950
2951 void lmv_free_memmd(struct lmv_stripe_md *lsm)
2952 {
2953         lmv_unpack_md(NULL, &lsm, NULL, 0);
2954 }
2955 EXPORT_SYMBOL(lmv_free_memmd);
2956
2957 int lmv_unpackmd(struct obd_export *exp, struct lov_stripe_md **lsmp,
2958                  struct lov_mds_md *lmm, int disk_len)
2959 {
2960         return lmv_unpack_md(exp, (struct lmv_stripe_md **)lsmp,
2961                              (union lmv_mds_md *)lmm, disk_len);
2962 }
2963
2964 int lmv_packmd(struct obd_export *exp, struct lov_mds_md **lmmp,
2965                struct lov_stripe_md *lsm)
2966 {
2967         struct obd_device               *obd = exp->exp_obd;
2968         struct lmv_obd                  *lmv_obd = &obd->u.lmv;
2969         const struct lmv_stripe_md      *lmv = (struct lmv_stripe_md *)lsm;
2970         int                             stripe_count;
2971
2972         if (lmmp == NULL) {
2973                 if (lsm != NULL)
2974                         stripe_count = lmv->lsm_md_stripe_count;
2975                 else
2976                         stripe_count = lmv_obd->desc.ld_tgt_count;
2977
2978                 return lmv_mds_md_size(stripe_count, LMV_MAGIC_V1);
2979         }
2980
2981         return lmv_pack_md((union lmv_mds_md **)lmmp, lmv, 0);
2982 }
2983
2984 static int lmv_cancel_unused(struct obd_export *exp, const struct lu_fid *fid,
2985                              ldlm_policy_data_t *policy, ldlm_mode_t mode,
2986                              ldlm_cancel_flags_t flags, void *opaque)
2987 {
2988         struct obd_device       *obd = exp->exp_obd;
2989         struct lmv_obd          *lmv = &obd->u.lmv;
2990         int                      rc = 0;
2991         int                      err;
2992         __u32                    i;
2993         ENTRY;
2994
2995         LASSERT(fid != NULL);
2996
2997         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2998                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
2999
3000                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active)
3001                         continue;
3002
3003                 err = md_cancel_unused(tgt->ltd_exp, fid, policy, mode, flags,
3004                                        opaque);
3005                 if (!rc)
3006                         rc = err;
3007         }
3008         RETURN(rc);
3009 }
3010
3011 int lmv_set_lock_data(struct obd_export *exp, __u64 *lockh, void *data,
3012                       __u64 *bits)
3013 {
3014         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
3015         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
3016         int                      rc;
3017         ENTRY;
3018
3019         if (tgt == NULL || tgt->ltd_exp == NULL)
3020                 RETURN(-EINVAL);
3021         rc =  md_set_lock_data(tgt->ltd_exp, lockh, data, bits);
3022         RETURN(rc);
3023 }
3024
3025 ldlm_mode_t lmv_lock_match(struct obd_export *exp, __u64 flags,
3026                            const struct lu_fid *fid, ldlm_type_t type,
3027                            ldlm_policy_data_t *policy, ldlm_mode_t mode,
3028                            struct lustre_handle *lockh)
3029 {
3030         struct obd_device       *obd = exp->exp_obd;
3031         struct lmv_obd          *lmv = &obd->u.lmv;
3032         ldlm_mode_t              rc;
3033         __u32                    i;
3034         ENTRY;
3035
3036         CDEBUG(D_INODE, "Lock match for "DFID"\n", PFID(fid));
3037
3038         /*
3039          * With CMD every object can have two locks in different namespaces:
3040          * lookup lock in space of mds storing direntry and update/open lock in
3041          * space of mds storing inode. Thus we check all targets, not only that
3042          * one fid was created in.
3043          */
3044         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
3045                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
3046
3047                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active)
3048                         continue;
3049
3050                 rc = md_lock_match(tgt->ltd_exp, flags, fid, type, policy, mode,
3051                                    lockh);
3052                 if (rc)
3053                         RETURN(rc);
3054         }
3055
3056         RETURN(0);
3057 }
3058
3059 int lmv_get_lustre_md(struct obd_export *exp, struct ptlrpc_request *req,
3060                       struct obd_export *dt_exp, struct obd_export *md_exp,
3061                       struct lustre_md *md)
3062 {
3063         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
3064         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
3065
3066         if (tgt == NULL || tgt->ltd_exp == NULL)
3067                 RETURN(-EINVAL);
3068
3069         return md_get_lustre_md(lmv->tgts[0]->ltd_exp, req, dt_exp, md_exp, md);
3070 }
3071
3072 int lmv_free_lustre_md(struct obd_export *exp, struct lustre_md *md)
3073 {
3074         struct obd_device       *obd = exp->exp_obd;
3075         struct lmv_obd          *lmv = &obd->u.lmv;
3076         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
3077         ENTRY;
3078
3079         if (md->lmv != NULL) {
3080                 lmv_free_memmd(md->lmv);
3081                 md->lmv = NULL;
3082         }
3083         if (tgt == NULL || tgt->ltd_exp == NULL)
3084                 RETURN(-EINVAL);
3085         RETURN(md_free_lustre_md(lmv->tgts[0]->ltd_exp, md));
3086 }
3087
3088 int lmv_set_open_replay_data(struct obd_export *exp,
3089                              struct obd_client_handle *och,
3090                              struct lookup_intent *it)
3091 {
3092         struct obd_device       *obd = exp->exp_obd;
3093         struct lmv_obd          *lmv = &obd->u.lmv;
3094         struct lmv_tgt_desc     *tgt;
3095         ENTRY;
3096
3097         tgt = lmv_find_target(lmv, &och->och_fid);
3098         if (IS_ERR(tgt))
3099                 RETURN(PTR_ERR(tgt));
3100
3101         RETURN(md_set_open_replay_data(tgt->ltd_exp, och, it));
3102 }
3103
3104 int lmv_clear_open_replay_data(struct obd_export *exp,
3105                                struct obd_client_handle *och)
3106 {
3107         struct obd_device       *obd = exp->exp_obd;
3108         struct lmv_obd          *lmv = &obd->u.lmv;
3109         struct lmv_tgt_desc     *tgt;
3110         ENTRY;
3111
3112         tgt = lmv_find_target(lmv, &och->och_fid);
3113         if (IS_ERR(tgt))
3114                 RETURN(PTR_ERR(tgt));
3115
3116         RETURN(md_clear_open_replay_data(tgt->ltd_exp, och));
3117 }
3118
3119 static int lmv_get_remote_perm(struct obd_export *exp,
3120                                const struct lu_fid *fid,
3121                                struct obd_capa *oc, __u32 suppgid,
3122                                struct ptlrpc_request **request)
3123 {
3124         struct obd_device       *obd = exp->exp_obd;
3125         struct lmv_obd          *lmv = &obd->u.lmv;
3126         struct lmv_tgt_desc     *tgt;
3127         int                      rc;
3128         ENTRY;
3129
3130         rc = lmv_check_connect(obd);
3131         if (rc)
3132                 RETURN(rc);
3133
3134         tgt = lmv_find_target(lmv, fid);
3135         if (IS_ERR(tgt))
3136                 RETURN(PTR_ERR(tgt));
3137
3138         rc = md_get_remote_perm(tgt->ltd_exp, fid, oc, suppgid, request);
3139         RETURN(rc);
3140 }
3141
3142 static int lmv_renew_capa(struct obd_export *exp, struct obd_capa *oc,
3143                           renew_capa_cb_t cb)
3144 {
3145         struct obd_device       *obd = exp->exp_obd;
3146         struct lmv_obd          *lmv = &obd->u.lmv;
3147         struct lmv_tgt_desc     *tgt;
3148         int                      rc;
3149         ENTRY;
3150
3151         rc = lmv_check_connect(obd);
3152         if (rc)
3153                 RETURN(rc);
3154
3155         tgt = lmv_find_target(lmv, &oc->c_capa.lc_fid);
3156         if (IS_ERR(tgt))
3157                 RETURN(PTR_ERR(tgt));
3158
3159         rc = md_renew_capa(tgt->ltd_exp, oc, cb);
3160         RETURN(rc);
3161 }
3162
3163 int lmv_unpack_capa(struct obd_export *exp, struct ptlrpc_request *req,
3164                     const struct req_msg_field *field, struct obd_capa **oc)
3165 {
3166         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
3167         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
3168
3169         if (tgt == NULL || tgt->ltd_exp == NULL)
3170                 RETURN(-EINVAL);
3171         return md_unpack_capa(tgt->ltd_exp, req, field, oc);
3172 }
3173
3174 int lmv_intent_getattr_async(struct obd_export *exp,
3175                              struct md_enqueue_info *minfo,
3176                              struct ldlm_enqueue_info *einfo)
3177 {
3178         struct md_op_data       *op_data = &minfo->mi_data;
3179         struct obd_device       *obd = exp->exp_obd;
3180         struct lmv_obd          *lmv = &obd->u.lmv;
3181         struct lmv_tgt_desc     *tgt = NULL;
3182         int                      rc;
3183         ENTRY;
3184
3185         rc = lmv_check_connect(obd);
3186         if (rc)
3187                 RETURN(rc);
3188
3189         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
3190         if (IS_ERR(tgt))
3191                 RETURN(PTR_ERR(tgt));
3192
3193         rc = md_intent_getattr_async(tgt->ltd_exp, minfo, einfo);
3194         RETURN(rc);
3195 }
3196
3197 int lmv_revalidate_lock(struct obd_export *exp, struct lookup_intent *it,
3198                         struct lu_fid *fid, __u64 *bits)
3199 {
3200         struct obd_device       *obd = exp->exp_obd;
3201         struct lmv_obd          *lmv = &obd->u.lmv;
3202         struct lmv_tgt_desc     *tgt;
3203         int                      rc;
3204         ENTRY;
3205
3206         rc = lmv_check_connect(obd);
3207         if (rc)
3208                 RETURN(rc);
3209
3210         tgt = lmv_find_target(lmv, fid);
3211         if (IS_ERR(tgt))
3212                 RETURN(PTR_ERR(tgt));
3213
3214         rc = md_revalidate_lock(tgt->ltd_exp, it, fid, bits);
3215         RETURN(rc);
3216 }
3217
3218 /**
3219  * For lmv, only need to send request to master MDT, and the master MDT will
3220  * process with other slave MDTs. The only exception is Q_GETOQUOTA for which
3221  * we directly fetch data from the slave MDTs.
3222  */
3223 int lmv_quotactl(struct obd_device *unused, struct obd_export *exp,
3224                  struct obd_quotactl *oqctl)
3225 {
3226         struct obd_device   *obd = class_exp2obd(exp);
3227         struct lmv_obd      *lmv = &obd->u.lmv;
3228         struct lmv_tgt_desc *tgt = lmv->tgts[0];
3229         int                  rc = 0;
3230         __u32                i;
3231         __u64                curspace, curinodes;
3232         ENTRY;
3233
3234         if (tgt == NULL ||
3235             tgt->ltd_exp == NULL ||
3236             !tgt->ltd_active ||
3237             lmv->desc.ld_tgt_count == 0) {
3238                 CERROR("master lmv inactive\n");
3239                 RETURN(-EIO);
3240         }
3241
3242         if (oqctl->qc_cmd != Q_GETOQUOTA) {
3243                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
3244                 RETURN(rc);
3245         }
3246
3247         curspace = curinodes = 0;
3248         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
3249                 int err;
3250                 tgt = lmv->tgts[i];
3251
3252                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active)
3253                         continue;
3254
3255                 err = obd_quotactl(tgt->ltd_exp, oqctl);
3256                 if (err) {
3257                         CERROR("getquota on mdt %d failed. %d\n", i, err);
3258                         if (!rc)
3259                                 rc = err;
3260                 } else {
3261                         curspace += oqctl->qc_dqblk.dqb_curspace;
3262                         curinodes += oqctl->qc_dqblk.dqb_curinodes;
3263                 }
3264         }
3265         oqctl->qc_dqblk.dqb_curspace = curspace;
3266         oqctl->qc_dqblk.dqb_curinodes = curinodes;
3267
3268         RETURN(rc);
3269 }
3270
3271 int lmv_quotacheck(struct obd_device *unused, struct obd_export *exp,
3272                    struct obd_quotactl *oqctl)
3273 {
3274         struct obd_device       *obd = class_exp2obd(exp);
3275         struct lmv_obd          *lmv = &obd->u.lmv;
3276         struct lmv_tgt_desc     *tgt;
3277         __u32                    i;
3278         int                      rc = 0;
3279         ENTRY;
3280
3281         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
3282                 int err;
3283                 tgt = lmv->tgts[i];
3284                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active) {
3285                         CERROR("lmv idx %d inactive\n", i);
3286                         RETURN(-EIO);
3287                 }
3288
3289                 err = obd_quotacheck(tgt->ltd_exp, oqctl);
3290                 if (err && !rc)
3291                         rc = err;
3292         }
3293
3294         RETURN(rc);
3295 }
3296
3297 int lmv_update_lsm_md(struct obd_export *exp, struct lmv_stripe_md *lsm,
3298                       struct mdt_body *body, ldlm_blocking_callback cb_blocking)
3299 {
3300         return lmv_revalidate_slaves(exp, body, lsm, cb_blocking, 0);
3301 }
3302
3303 int lmv_merge_attr(struct obd_export *exp, const struct lmv_stripe_md *lsm,
3304                    struct cl_attr *attr)
3305 {
3306 #ifdef __KERNEL__
3307         int i;
3308
3309         for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
3310                 struct inode *inode = lsm->lsm_md_oinfo[i].lmo_root;
3311
3312                 CDEBUG(D_INFO, ""DFID" size %llu, nlink %u, atime %lu ctime"
3313                        "%lu, mtime %lu.\n", PFID(&lsm->lsm_md_oinfo[i].lmo_fid),
3314                        i_size_read(inode), inode->i_nlink,
3315                        LTIME_S(inode->i_atime), LTIME_S(inode->i_ctime),
3316                        LTIME_S(inode->i_mtime));
3317
3318                 /* for slave stripe, it needs to subtract nlink for . and .. */
3319                 if (i != 0)
3320                         attr->cat_nlink += inode->i_nlink - 2;
3321                 else
3322                         attr->cat_nlink = inode->i_nlink;
3323
3324                 attr->cat_size += i_size_read(inode);
3325
3326                 if (attr->cat_atime < LTIME_S(inode->i_atime))
3327                         attr->cat_atime = LTIME_S(inode->i_atime);
3328
3329                 if (attr->cat_ctime < LTIME_S(inode->i_ctime))
3330                         attr->cat_ctime = LTIME_S(inode->i_ctime);
3331
3332                 if (attr->cat_mtime < LTIME_S(inode->i_mtime))
3333                         attr->cat_mtime = LTIME_S(inode->i_mtime);
3334         }
3335 #endif
3336         return 0;
3337 }
3338
3339 struct obd_ops lmv_obd_ops = {
3340         .o_owner                = THIS_MODULE,
3341         .o_setup                = lmv_setup,
3342         .o_cleanup              = lmv_cleanup,
3343         .o_precleanup           = lmv_precleanup,
3344         .o_process_config       = lmv_process_config,
3345         .o_connect              = lmv_connect,
3346         .o_disconnect           = lmv_disconnect,
3347         .o_statfs               = lmv_statfs,
3348         .o_get_info             = lmv_get_info,
3349         .o_set_info_async       = lmv_set_info_async,
3350         .o_packmd               = lmv_packmd,
3351         .o_unpackmd             = lmv_unpackmd,
3352         .o_notify               = lmv_notify,
3353         .o_get_uuid             = lmv_get_uuid,
3354         .o_iocontrol            = lmv_iocontrol,
3355         .o_quotacheck           = lmv_quotacheck,
3356         .o_quotactl             = lmv_quotactl
3357 };
3358
3359 struct md_ops lmv_md_ops = {
3360         .m_getstatus            = lmv_getstatus,
3361         .m_null_inode           = lmv_null_inode,
3362         .m_find_cbdata          = lmv_find_cbdata,
3363         .m_close                = lmv_close,
3364         .m_create               = lmv_create,
3365         .m_done_writing         = lmv_done_writing,
3366         .m_enqueue              = lmv_enqueue,
3367         .m_getattr              = lmv_getattr,
3368         .m_getxattr             = lmv_getxattr,
3369         .m_getattr_name         = lmv_getattr_name,
3370         .m_intent_lock          = lmv_intent_lock,
3371         .m_link                 = lmv_link,
3372         .m_rename               = lmv_rename,
3373         .m_setattr              = lmv_setattr,
3374         .m_setxattr             = lmv_setxattr,
3375         .m_fsync                = lmv_fsync,
3376         .m_read_entry           = lmv_read_entry,
3377         .m_unlink               = lmv_unlink,
3378         .m_init_ea_size         = lmv_init_ea_size,
3379         .m_cancel_unused        = lmv_cancel_unused,
3380         .m_set_lock_data        = lmv_set_lock_data,
3381         .m_lock_match           = lmv_lock_match,
3382         .m_get_lustre_md        = lmv_get_lustre_md,
3383         .m_free_lustre_md       = lmv_free_lustre_md,
3384         .m_update_lsm_md        = lmv_update_lsm_md,
3385         .m_merge_attr           = lmv_merge_attr,
3386         .m_set_open_replay_data = lmv_set_open_replay_data,
3387         .m_clear_open_replay_data = lmv_clear_open_replay_data,
3388         .m_renew_capa           = lmv_renew_capa,
3389         .m_unpack_capa          = lmv_unpack_capa,
3390         .m_get_remote_perm      = lmv_get_remote_perm,
3391         .m_intent_getattr_async = lmv_intent_getattr_async,
3392         .m_revalidate_lock      = lmv_revalidate_lock
3393 };
3394
3395 int __init lmv_init(void)
3396 {
3397         return class_register_type(&lmv_obd_ops, &lmv_md_ops, true, NULL,
3398 #ifndef HAVE_ONLY_PROCFS_SEQ
3399                                    NULL,
3400 #endif
3401                                    LUSTRE_LMV_NAME, NULL);
3402 }
3403
3404 #ifdef __KERNEL__
3405 static void lmv_exit(void)
3406 {
3407         class_unregister_type(LUSTRE_LMV_NAME);
3408 }
3409
3410 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
3411 MODULE_DESCRIPTION("Lustre Logical Metadata Volume OBD driver");
3412 MODULE_LICENSE("GPL");
3413
3414 module_init(lmv_init);
3415 module_exit(lmv_exit);
3416 #endif