lustre/lov/lov_obd.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Copyright (C) 2002, 2003 Cluster File Systems, Inc.
   5  * Author: Phil Schwan <phil@clusterfs.com>
   6  *         Peter Braam <braam@clusterfs.com>
   7  *         Mike Shaver <shaver@clusterfs.com>
   8  *
   9  *   This file is part of Lustre, http://www.lustre.org.
  10  *
  11  *   Lustre is free software; you can redistribute it and/or
  12  *   modify it under the terms of version 2 of the GNU General Public
  13  *   License as published by the Free Software Foundation.
  14  *
  15  *   Lustre is distributed in the hope that it will be useful,
  16  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *   GNU General Public License for more details.
  19  *
  20  *   You should have received a copy of the GNU General Public License
  21  *   along with Lustre; if not, write to the Free Software
  22  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23  */
  24
  25 #ifndef EXPORT_SYMTAB
  26 # define EXPORT_SYMTAB
  27 #endif
  28 #define DEBUG_SUBSYSTEM S_LOV
  29 #ifdef __KERNEL__
  30 #include <linux/slab.h>
  31 #include <linux/module.h>
  32 #include <linux/init.h>
  33 #include <linux/slab.h>
  34 #include <linux/pagemap.h>
  35 #include <linux/seq_file.h>
  36 #include <asm/div64.h>
  37 #else
  38 #include <liblustre.h>
  39 #endif
  40
  41 #include <linux/obd_support.h>
  42 #include <linux/lustre_lib.h>
  43 #include <linux/lustre_net.h>
  44 #include <linux/lustre_idl.h>
  45 #include <linux/lustre_dlm.h>
  46 #include <linux/lustre_mds.h>
  47 #include <linux/obd_class.h>
  48 #include <linux/obd_lov.h>
  49 #include <linux/obd_ost.h>
  50 #include <linux/lprocfs_status.h>
  51
  52 #include "lov_internal.h"
  53
  54 static int lov_stripe_offset(struct lov_stripe_md *lsm, obd_off lov_off,
  55                              int stripeno, obd_off *obd_off);
  56
  57 struct lov_lock_handles {
  58         struct portals_handle llh_handle;
  59         atomic_t llh_refcount;
  60         int llh_stripe_count;
  61         struct lustre_handle llh_handles[0];
  62 };
  63
  64 static void lov_llh_addref(void *llhp)
  65 {
  66         struct lov_lock_handles *llh = llhp;
  67
  68         atomic_inc(&llh->llh_refcount);
  69         CDEBUG(D_INFO, "GETting llh %p : new refcount %d\n", llh,
  70                atomic_read(&llh->llh_refcount));
  71 }
  72
  73 static struct lov_lock_handles *lov_llh_new(struct lov_stripe_md *lsm)
  74 {
  75         struct lov_lock_handles *llh;
  76
  77         OBD_ALLOC(llh, sizeof *llh +
  78                   sizeof(*llh->llh_handles) * lsm->lsm_stripe_count);
  79         if (llh == NULL) {
  80                 CERROR("out of memory\n");
  81                 return NULL;
  82         }
  83         atomic_set(&llh->llh_refcount, 2);
  84         llh->llh_stripe_count = lsm->lsm_stripe_count;
  85         INIT_LIST_HEAD(&llh->llh_handle.h_link);
  86         class_handle_hash(&llh->llh_handle, lov_llh_addref);
  87         return llh;
  88 }
  89
  90 static struct lov_lock_handles *lov_handle2llh(struct lustre_handle *handle)
  91 {
  92         ENTRY;
  93         LASSERT(handle != NULL);
  94         RETURN(class_handle2object(handle->cookie));
  95 }
  96
  97 static void lov_llh_put(struct lov_lock_handles *llh)
  98 {
  99         CDEBUG(D_INFO, "PUTting llh %p : new refcount %d\n", llh,
 100                atomic_read(&llh->llh_refcount) - 1);
 101         LASSERT(atomic_read(&llh->llh_refcount) > 0 &&
 102                 atomic_read(&llh->llh_refcount) < 0x5a5a);
 103         if (atomic_dec_and_test(&llh->llh_refcount)) {
 104                 LASSERT(list_empty(&llh->llh_handle.h_link));
 105                 OBD_FREE(llh, sizeof *llh +
 106                          sizeof(*llh->llh_handles) * llh->llh_stripe_count);
 107         }
 108 }
 109
 110 static void lov_llh_destroy(struct lov_lock_handles *llh)
 111 {
 112         class_handle_unhash(&llh->llh_handle);
 113         lov_llh_put(llh);
 114 }
 115
 116 /* obd methods */
 117 #define MAX_STRING_SIZE 128
 118 static int lov_connect_obd(struct obd_device *obd, struct lov_tgt_desc *tgt,
 119                            int activate, unsigned long connect_flags)
 120 {
 121         struct obd_uuid lov_osc_uuid = { "LOV_OSC_UUID" };
 122         struct obd_uuid *tgt_uuid = &tgt->uuid;
 123
 124 #ifdef __KERNEL__
 125         struct proc_dir_entry *lov_proc_dir;
 126 #endif
 127         struct lov_obd *lov = &obd->u.lov;
 128         struct lustre_handle conn = {0, };
 129         struct obd_device *tgt_obd;
 130         int rc;
 131         ENTRY;
 132
 133         tgt_obd = class_find_client_obd(tgt_uuid, LUSTRE_OSC_NAME,
 134                                         &obd->obd_uuid);
 135
 136         if (!tgt_obd) {
 137                 CERROR("Target %s not attached\n", tgt_uuid->uuid);
 138                 RETURN(-EINVAL);
 139         }
 140
 141         if (!tgt_obd->obd_set_up) {
 142                 CERROR("Target %s not set up\n", tgt_uuid->uuid);
 143                 RETURN(-EINVAL);
 144         }
 145
 146         if (activate) {
 147                 tgt_obd->obd_no_recov = 0;
 148                 ptlrpc_activate_import(tgt_obd->u.cli.cl_import);
 149         }
 150
 151         if (tgt_obd->u.cli.cl_import->imp_invalid) {
 152                 CERROR("not connecting OSC %s; administratively "
 153                        "disabled\n", tgt_uuid->uuid);
 154                 rc = obd_register_observer(tgt_obd, obd);
 155                 if (rc) {
 156                         CERROR("Target %s register_observer error %d; "
 157                                "will not be able to reactivate\n",
 158                                tgt_uuid->uuid, rc);
 159                 }
 160                 RETURN(0);
 161         }
 162
 163         rc = obd_connect(&conn, tgt_obd, &lov_osc_uuid, connect_flags);
 164         if (rc) {
 165                 CERROR("Target %s connect error %d\n", tgt_uuid->uuid, rc);
 166                 RETURN(rc);
 167         }
 168         tgt->ltd_exp = class_conn2export(&conn);
 169
 170         rc = obd_register_observer(tgt_obd, obd);
 171         if (rc) {
 172                 CERROR("Target %s register_observer error %d\n",
 173                        tgt_uuid->uuid, rc);
 174                 obd_disconnect(tgt->ltd_exp, 0);
 175                 tgt->ltd_exp = NULL;
 176                 RETURN(rc);
 177         }
 178
 179         tgt->active = 1;
 180         lov->desc.ld_active_tgt_count++;
 181
 182 #ifdef __KERNEL__
 183         lov_proc_dir = lprocfs_srch(obd->obd_proc_entry, "target_obds");
 184         if (lov_proc_dir) {
 185                 struct obd_device *osc_obd = class_conn2obd(&conn);
 186                 struct proc_dir_entry *osc_symlink;
 187                 char name[MAX_STRING_SIZE + 1];
 188
 189                 LASSERT(osc_obd != NULL);
 190                 LASSERT(osc_obd->obd_type != NULL);
 191                 LASSERT(osc_obd->obd_type->typ_name != NULL);
 192                 name[MAX_STRING_SIZE] = '\0';
 193                 snprintf(name, MAX_STRING_SIZE, "../../../%s/%s",
 194                          osc_obd->obd_type->typ_name,
 195                          osc_obd->obd_name);
 196                 osc_symlink = proc_symlink(osc_obd->obd_name, lov_proc_dir,
 197                                            name);
 198                 if (osc_symlink == NULL) {
 199                         CERROR("could not register LOV target "
 200                                "/proc/fs/lustre/%s/%s/target_obds/%s\n",
 201                                obd->obd_type->typ_name, obd->obd_name,
 202                                osc_obd->obd_name);
 203                         lprocfs_remove(lov_proc_dir);
 204                         lov_proc_dir = NULL;
 205                 }
 206         }
 207 #endif
 208
 209         RETURN(0);
 210 }
 211
 212 static int lov_connect(struct lustre_handle *conn, struct obd_device *obd,
 213                        struct obd_uuid *cluuid, unsigned long connect_flags)
 214 {
 215 #ifdef __KERNEL__
 216         struct proc_dir_entry *lov_proc_dir;
 217 #endif
 218         struct lov_obd *lov = &obd->u.lov;
 219         struct lov_tgt_desc *tgt;
 220         struct obd_export *exp;
 221         int rc, rc2, i;
 222         ENTRY;
 223
 224         rc = class_connect(conn, obd, cluuid);
 225         if (rc)
 226                 RETURN(rc);
 227
 228         exp = class_conn2export(conn);
 229
 230         /* We don't want to actually do the underlying connections more than
 231          * once, so keep track. */
 232         lov->refcount++;
 233         if (lov->refcount > 1) {
 234                 class_export_put(exp);
 235                 RETURN(0);
 236         }
 237
 238 #ifdef __KERNEL__
 239         lov_proc_dir = lprocfs_register("target_obds", obd->obd_proc_entry,
 240                                         NULL, NULL);
 241         if (IS_ERR(lov_proc_dir)) {
 242                 CERROR("could not register /proc/fs/lustre/%s/%s/target_obds.",
 243                        obd->obd_type->typ_name, obd->obd_name);
 244                 lov_proc_dir = NULL;
 245         }
 246 #endif
 247
 248         /* connect_flags is the MDS number, save for use in lov_add_obd */
 249         lov->lov_connect_flags = connect_flags;
 250         for (i = 0, tgt = lov->tgts; i < lov->desc.ld_tgt_count; i++, tgt++) {
 251                 if (obd_uuid_empty(&tgt->uuid))
 252                         continue;
 253                 rc = lov_connect_obd(obd, tgt, 0, connect_flags);
 254                 if (rc)
 255                         GOTO(out_disc, rc);
 256         }
 257
 258         class_export_put(exp);
 259         RETURN (0);
 260
 261  out_disc:
 262 #ifdef __KERNEL__
 263         if (lov_proc_dir)
 264                 lprocfs_remove(lov_proc_dir);
 265 #endif
 266
 267         while (i-- > 0) {
 268                 struct obd_uuid uuid;
 269                 --tgt;
 270                 --lov->desc.ld_active_tgt_count;
 271                 tgt->active = 0;
 272                 /* save for CERROR below; (we know it's terminated) */
 273                 uuid = tgt->uuid;
 274                 rc2 = obd_disconnect(tgt->ltd_exp, 0);
 275                 if (rc2)
 276                         CERROR("error: LOV target %s disconnect on OST idx %d: "
 277                                "rc = %d\n", uuid.uuid, i, rc2);
 278         }
 279         class_disconnect(exp, 0);
 280         RETURN (rc);
 281 }
 282
 283 static int lov_disconnect_obd(struct obd_device *obd,
 284                               struct lov_tgt_desc *tgt,
 285                               unsigned long flags)
 286 {
 287 #ifdef __KERNEL__
 288         struct proc_dir_entry *lov_proc_dir;
 289 #endif
 290         struct obd_device *osc_obd = class_exp2obd(tgt->ltd_exp);
 291         struct lov_obd *lov = &obd->u.lov;
 292         int rc;
 293         ENTRY;
 294
 295 #ifdef __KERNEL__
 296         lov_proc_dir = lprocfs_srch(obd->obd_proc_entry, "target_obds");
 297         if (lov_proc_dir) {
 298                 struct proc_dir_entry *osc_symlink;
 299
 300                 osc_symlink = lprocfs_srch(lov_proc_dir, osc_obd->obd_name);
 301                 if (osc_symlink) {
 302                         lprocfs_remove(osc_symlink);
 303                 } else {
 304                         CERROR("/proc/fs/lustre/%s/%s/target_obds/%s missing\n",
 305                                obd->obd_type->typ_name, obd->obd_name,
 306                                osc_obd->obd_name);
 307                 }
 308         }
 309 #endif
 310
 311         if (obd->obd_no_recov) {
 312                 /* Pass it on to our clients.
 313                  * XXX This should be an argument to disconnect,
 314                  * XXX not a back-door flag on the OBD.  Ah well.
 315                  */
 316                 if (osc_obd)
 317                         osc_obd->obd_no_recov = 1;
 318         }
 319
 320         obd_register_observer(tgt->ltd_exp->exp_obd, NULL);
 321         rc = obd_disconnect(tgt->ltd_exp, flags);
 322         if (rc) {
 323                 if (tgt->active) {
 324                         CERROR("Target %s disconnect error %d\n",
 325                                tgt->uuid.uuid, rc);
 326                 }
 327                 rc = 0;
 328         }
 329
 330         if (tgt->active) {
 331                 tgt->active = 0;
 332                 lov->desc.ld_active_tgt_count--;
 333         }
 334
 335         tgt->ltd_exp = NULL;
 336         RETURN(0);
 337 }
 338
 339 static int lov_disconnect(struct obd_export *exp, unsigned long flags)
 340 {
 341         struct obd_device *obd = class_exp2obd(exp);
 342 #ifdef __KERNEL__
 343         struct proc_dir_entry *lov_proc_dir;
 344 #endif
 345         struct lov_obd *lov = &obd->u.lov;
 346         struct lov_tgt_desc *tgt;
 347         int rc, i;
 348         ENTRY;
 349
 350         if (!lov->tgts)
 351                 goto out_local;
 352
 353         /* Only disconnect the underlying layers on the final disconnect. */
 354         lov->refcount--;
 355         if (lov->refcount != 0)
 356                 goto out_local;
 357
 358         for (i = 0, tgt = lov->tgts; i < lov->desc.ld_tgt_count; i++, tgt++) {
 359                 if (tgt->ltd_exp)
 360                         lov_disconnect_obd(obd, tgt, flags);
 361         }
 362
 363 #ifdef __KERNEL__
 364         lov_proc_dir = lprocfs_srch(obd->obd_proc_entry, "target_obds");
 365         if (lov_proc_dir) {
 366                 lprocfs_remove(lov_proc_dir);
 367         } else {
 368                 CERROR("/proc/fs/lustre/%s/%s/target_obds missing.",
 369                        obd->obd_type->typ_name, obd->obd_name);
 370         }
 371 #endif
 372
 373  out_local:
 374         rc = class_disconnect(exp, 0);
 375         RETURN(rc);
 376 }
 377
 378 /* Error codes:
 379  *
 380  *  -EINVAL  : UUID can't be found in the LOV's target list
 381  *  -ENOTCONN: The UUID is found, but the target connection is bad (!)
 382  *  -EBADF   : The UUID is found, but the OBD is the wrong type (!)
 383  */
 384 static int lov_set_osc_active(struct lov_obd *lov, struct obd_uuid *uuid,
 385                               int activate)
 386 {
 387         struct lov_tgt_desc *tgt;
 388         int i, rc = 0;
 389         ENTRY;
 390
 391         CDEBUG(D_INFO, "Searching in lov %p for uuid %s (activate=%d)\n",
 392                lov, uuid->uuid, activate);
 393
 394         spin_lock(&lov->lov_lock);
 395         for (i = 0, tgt = lov->tgts; i < lov->desc.ld_tgt_count; i++, tgt++) {
 396                 CDEBUG(D_INFO, "lov idx %d is %s conn "LPX64"\n",
 397                        i, tgt->uuid.uuid, tgt->ltd_exp->exp_handle.h_cookie);
 398                 if (strncmp(uuid->uuid, tgt->uuid.uuid, sizeof uuid->uuid) == 0)
 399                         break;
 400         }
 401
 402         if (i == lov->desc.ld_tgt_count)
 403                 GOTO(out, rc = -EINVAL);
 404
 405
 406         if (tgt->active == activate) {
 407                 CDEBUG(D_INFO, "OSC %s already %sactive!\n", uuid->uuid,
 408                         activate ? "" : "in");
 409                 GOTO(out, rc);
 410         }
 411
 412         CDEBUG(D_INFO, "Marking OSC %s %sactive\n", uuid->uuid,
 413                activate ? "" : "in");
 414
 415         tgt->active = activate;
 416         if (activate)
 417                 lov->desc.ld_active_tgt_count++;
 418         else
 419                 lov->desc.ld_active_tgt_count--;
 420
 421         EXIT;
 422  out:
 423         spin_unlock(&lov->lov_lock);
 424         return rc;
 425 }
 426
 427 static int lov_notify(struct obd_device *obd, struct obd_device *watched,
 428                       int active, void *data)
 429 {
 430         int rc;
 431         struct obd_uuid *uuid;
 432         ENTRY;
 433
 434         if (strcmp(watched->obd_type->typ_name, LUSTRE_OSC_NAME)) {
 435                 CERROR("unexpected notification of %s %s!\n",
 436                        watched->obd_type->typ_name,
 437                        watched->obd_name);
 438                 return -EINVAL;
 439         }
 440         uuid = &watched->u.cli.cl_import->imp_target_uuid;
 441
 442         /* Set OSC as active before notifying the observer, so the
 443          * observer can use the OSC normally.
 444          */
 445         rc = lov_set_osc_active(&obd->u.lov, uuid, active);
 446         if (rc) {
 447                 CERROR("%sactivation of %s failed: %d\n",
 448                        active ? "" : "de", uuid->uuid, rc);
 449                 RETURN(rc);
 450         }
 451
 452         if (obd->obd_observer)
 453                 /* Pass the notification up the chain. */
 454                 rc = obd_notify(obd->obd_observer, watched, active, data);
 455
 456         RETURN(rc);
 457 }
 458
 459 int lov_attach(struct obd_device *dev, obd_count len, void *data)
 460 {
 461         struct lprocfs_static_vars lvars;
 462         int rc;
 463
 464         lprocfs_init_vars(lov, &lvars);
 465         rc = lprocfs_obd_attach(dev, lvars.obd_vars);
 466         if (rc == 0) {
 467 #ifdef __KERNEL__
 468                 struct proc_dir_entry *entry;
 469
 470                 entry = create_proc_entry("target_obd_status", 0444,
 471                                           dev->obd_proc_entry);
 472                 if (entry == NULL) {
 473                         rc = -ENOMEM;
 474                 } else {
 475                         entry->proc_fops = &lov_proc_target_fops;
 476                         entry->data = dev;
 477                 }
 478 #endif
 479         }
 480         return rc;
 481 }
 482
 483 int lov_detach(struct obd_device *dev)
 484 {
 485         return lprocfs_obd_detach(dev);
 486 }
 487
 488 static int lov_setup(struct obd_device *obd, obd_count len, void *buf)
 489 {
 490         struct lustre_cfg *lcfg = buf;
 491         struct lov_desc *desc;
 492         struct lov_obd *lov = &obd->u.lov;
 493         int count;
 494         ENTRY;
 495
 496         if (lcfg->lcfg_inllen1 < 1) {
 497                 CERROR("LOV setup requires a descriptor\n");
 498                 RETURN(-EINVAL);
 499         }
 500
 501         desc = (struct lov_desc *)lcfg->lcfg_inlbuf1;
 502         if (sizeof(*desc) > lcfg->lcfg_inllen1) {
 503                 CERROR("descriptor size wrong: %d > %d\n",
 504                        (int)sizeof(*desc), lcfg->lcfg_inllen1);
 505                 RETURN(-EINVAL);
 506         }
 507
 508         /* Because of 64-bit divide/mod operations only work with a 32-bit
 509          * divisor in a 32-bit kernel, we cannot support a stripe width
 510          * of 4GB or larger on 32-bit CPUs.
 511          */
 512
 513         count = desc->ld_default_stripe_count;
 514         if (count && (count * desc->ld_default_stripe_size) > ~0UL) {
 515                 CERROR("LOV: stripe width "LPU64"x%u > %lu on 32-bit system\n",
 516                        desc->ld_default_stripe_size, count, ~0UL);
 517                 RETURN(-EINVAL);
 518         }
 519         if (desc->ld_tgt_count > 0) {
 520                 lov->bufsize= sizeof(struct lov_tgt_desc) * desc->ld_tgt_count;
 521         } else {
 522                 lov->bufsize = sizeof(struct lov_tgt_desc) * LOV_MAX_TGT_COUNT;
 523         }
 524         OBD_ALLOC(lov->tgts, lov->bufsize);
 525         if (lov->tgts == NULL) {
 526                 lov->bufsize = 0;
 527                 CERROR("couldn't allocate %d bytes for target table.\n",
 528                        lov->bufsize);
 529                 RETURN(-EINVAL);
 530         }
 531
 532         desc->ld_tgt_count = 0;
 533         desc->ld_active_tgt_count = 0;
 534         lov->desc = *desc;
 535         spin_lock_init(&lov->lov_lock);
 536         sema_init(&lov->lov_llog_sem, 1);
 537
 538         RETURN(0);
 539 }
 540
 541 static int lov_cleanup(struct obd_device *obd, int flags)
 542 {
 543         struct lov_obd *lov = &obd->u.lov;
 544
 545         OBD_FREE(lov->tgts, lov->bufsize);
 546         RETURN(0);
 547 }
 548
 549 static int
 550 lov_add_obd(struct obd_device *obd, struct obd_uuid *uuidp, int index, int gen)
 551 {
 552         struct lov_obd *lov = &obd->u.lov;
 553         struct lov_tgt_desc *tgt;
 554         int rc;
 555         ENTRY;
 556
 557         CDEBUG(D_CONFIG, "uuid: %s idx: %d gen: %d\n",
 558                uuidp->uuid, index, gen);
 559
 560         if ((index < 0) || (index >= LOV_MAX_TGT_COUNT)) {
 561                 CERROR("request to add OBD %s at invalid index: %d\n",
 562                        uuidp->uuid, index);
 563                 RETURN(-EINVAL);
 564         }
 565
 566         if (gen <= 0) {
 567                 CERROR("request to add OBD %s with invalid generation: %d\n",
 568                        uuidp->uuid, gen);
 569                 RETURN(-EINVAL);
 570         }
 571
 572         tgt = lov->tgts + index;
 573         if (!obd_uuid_empty(&tgt->uuid)) {
 574                 CERROR("OBD already assigned at LOV target index %d\n",
 575                        index);
 576                 RETURN(-EEXIST);
 577         }
 578
 579         tgt->uuid = *uuidp;
 580         /* XXX - add a sanity check on the generation number. */
 581         tgt->ltd_gen = gen;
 582
 583         if (index >= lov->desc.ld_tgt_count)
 584                 lov->desc.ld_tgt_count = index + 1;
 585
 586         CDEBUG(D_CONFIG, "idx: %d ltd_gen: %d ld_tgt_count: %d\n",
 587                 index, tgt->ltd_gen, lov->desc.ld_tgt_count);
 588
 589         if (lov->refcount == 0)
 590                 RETURN(0);
 591
 592         if (tgt->ltd_exp) {
 593                 struct obd_device *osc_obd;
 594
 595                 osc_obd = class_exp2obd(tgt->ltd_exp);
 596                 if (osc_obd)
 597                         osc_obd->obd_no_recov = 0;
 598         }
 599
 600         rc = lov_connect_obd(obd, tgt, 1, lov->lov_connect_flags);
 601         if (rc)
 602                 GOTO(out, rc);
 603
 604         if (obd->obd_observer) {
 605                 /* tell the mds_lov about the new target */
 606                 rc = obd_notify(obd->obd_observer, tgt->ltd_exp->exp_obd, 1,
 607                                 (void *)index);
 608         }
 609
 610         GOTO(out, rc);
 611  out:
 612         if (rc && tgt->ltd_exp != NULL)
 613                 lov_disconnect_obd(obd, tgt, 0);
 614         return rc;
 615 }
 616
 617 static int
 618 lov_del_obd(struct obd_device *obd, struct obd_uuid *uuidp, int index, int gen)
 619 {
 620         struct lov_obd *lov = &obd->u.lov;
 621         struct lov_tgt_desc *tgt;
 622         int count = lov->desc.ld_tgt_count;
 623         int rc = 0;
 624         ENTRY;
 625
 626         CDEBUG(D_CONFIG, "uuid: %s idx: %d gen: %d\n",
 627                uuidp->uuid, index, gen);
 628
 629         if (index >= count) {
 630                 CERROR("LOV target index %d >= number of LOV OBDs %d.\n",
 631                        index, count);
 632                 RETURN(-EINVAL);
 633         }
 634
 635         tgt = lov->tgts + index;
 636
 637         if (obd_uuid_empty(&tgt->uuid)) {
 638                 CERROR("LOV target at index %d is not setup.\n", index);
 639                 RETURN(-EINVAL);
 640         }
 641
 642         if (strncmp(uuidp->uuid, tgt->uuid.uuid, sizeof uuidp->uuid) != 0) {
 643                 CERROR("LOV target UUID %s at index %d doesn't match %s.\n",
 644                        tgt->uuid.uuid, index, uuidp->uuid);
 645                 RETURN(-EINVAL);
 646         }
 647
 648         if (tgt->ltd_exp) {
 649                 struct obd_device *osc_obd;
 650
 651                 osc_obd = class_exp2obd(tgt->ltd_exp);
 652                 if (osc_obd) {
 653                         osc_obd->obd_no_recov = 1;
 654                         rc = obd_llog_finish(osc_obd, &osc_obd->obd_llogs, 1);
 655                         if (rc)
 656                                 CERROR("osc_llog_finish error: %d\n", rc);
 657                 }
 658                 lov_disconnect_obd(obd, tgt, 0);
 659         }
 660
 661         /* XXX - right now there is a dependency on ld_tgt_count being the
 662          * maximum tgt index for computing the mds_max_easize. So we can't
 663          * shrink it. */
 664
 665         /* lt_gen = 0 will mean it will not match the gen of any valid loi */
 666         memset(tgt, 0, sizeof(*tgt));
 667
 668         CDEBUG(D_CONFIG, "uuid: %s idx: %d gen: %d exp: %p active: %d\n",
 669                tgt->uuid.uuid, index, tgt->ltd_gen, tgt->ltd_exp, tgt->active);
 670
 671         RETURN(rc);
 672 }
 673
 674 static int lov_process_config(struct obd_device *obd, obd_count len, void *buf)
 675 {
 676         struct lustre_cfg *lcfg = buf;
 677         struct obd_uuid obd_uuid;
 678         int cmd;
 679         int index;
 680         int gen;
 681         int rc = 0;
 682         ENTRY;
 683
 684         switch(cmd = lcfg->lcfg_command) {
 685         case LCFG_LOV_ADD_OBD:
 686         case LCFG_LOV_DEL_OBD: {
 687                 if (lcfg->lcfg_inllen1 > sizeof(obd_uuid.uuid))
 688                         GOTO(out, rc = -EINVAL);
 689
 690                 obd_str2uuid(&obd_uuid, lcfg->lcfg_inlbuf1);
 691
 692                 if (sscanf(lcfg->lcfg_inlbuf2, "%d", &index) != 1)
 693                         GOTO(out, rc = -EINVAL);
 694                 if (sscanf(lcfg->lcfg_inlbuf3, "%d", &gen) != 1)
 695                         GOTO(out, rc = -EINVAL);
 696                 if (cmd == LCFG_LOV_ADD_OBD)
 697                         rc = lov_add_obd(obd, &obd_uuid, index, gen);
 698                 else
 699                         rc = lov_del_obd(obd, &obd_uuid, index, gen);
 700                 GOTO(out, rc);
 701         }
 702         default: {
 703                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
 704                 GOTO(out, rc = -EINVAL);
 705
 706         }
 707         }
 708 out:
 709         RETURN(rc);
 710 }
 711
 712 /* compute object size given "stripeno" and the ost size */
 713 static obd_size lov_stripe_size(struct lov_stripe_md *lsm, obd_size ost_size,
 714                                 int stripeno)
 715 {
 716         unsigned long ssize  = lsm->lsm_stripe_size;
 717         unsigned long swidth = ssize * lsm->lsm_stripe_count;
 718         unsigned long stripe_size;
 719         obd_size lov_size;
 720
 721         if (ost_size == 0)
 722                 return 0;
 723
 724         /* do_div(a, b) returns a % b, and a = a / b */
 725         stripe_size = do_div(ost_size, ssize);
 726         if (stripe_size)
 727                 lov_size = ost_size * swidth + stripeno * ssize + stripe_size;
 728         else
 729                 lov_size = (ost_size - 1) * swidth + (stripeno + 1) * ssize;
 730
 731         return lov_size;
 732 }
 733
 734 static void lov_merge_attrs(struct obdo *tgt, struct obdo *src, obd_valid valid,
 735                             struct lov_stripe_md *lsm, int stripeno, int *set)
 736 {
 737         valid &= src->o_valid;
 738
 739         if (*set) {
 740                 if (valid & OBD_MD_FLSIZE) {
 741                         /* this handles sparse files properly */
 742                         obd_size lov_size;
 743
 744                         lov_size = lov_stripe_size(lsm, src->o_size, stripeno);
 745                         if (lov_size > tgt->o_size)
 746                                 tgt->o_size = lov_size;
 747                 }
 748                 if (valid & OBD_MD_FLBLOCKS)
 749                         tgt->o_blocks += src->o_blocks;
 750                 if (valid & OBD_MD_FLBLKSZ)
 751                         tgt->o_blksize += src->o_blksize;
 752                 if (valid & OBD_MD_FLCTIME && tgt->o_ctime < src->o_ctime)
 753                         tgt->o_ctime = src->o_ctime;
 754                 if (valid & OBD_MD_FLMTIME && tgt->o_mtime < src->o_mtime)
 755                         tgt->o_mtime = src->o_mtime;
 756         } else {
 757                 memcpy(tgt, src, sizeof(*tgt));
 758                 tgt->o_id = lsm->lsm_object_id;
 759                 if (valid & OBD_MD_FLSIZE)
 760                         tgt->o_size = lov_stripe_size(lsm,src->o_size,stripeno);
 761                 *set = 1;
 762         }
 763 }
 764
 765 #ifndef log2
 766 #define log2(n) ffz(~(n))
 767 #endif
 768
 769 static int lov_clear_orphans(struct obd_export *export, struct obdo *src_oa,
 770                              struct lov_stripe_md **ea,
 771                              struct obd_trans_info *oti)
 772 {
 773         struct lov_obd *lov;
 774         struct obdo *tmp_oa;
 775         struct obd_uuid *ost_uuid = NULL;
 776         int rc = 0, i;
 777         ENTRY;
 778
 779         LASSERT(src_oa->o_valid & OBD_MD_FLFLAGS &&
 780                 src_oa->o_flags == OBD_FL_DELORPHAN);
 781
 782         lov = &export->exp_obd->u.lov;
 783
 784         tmp_oa = obdo_alloc();
 785         if (tmp_oa == NULL)
 786                 RETURN(-ENOMEM);
 787
 788         if (src_oa->o_valid & OBD_MD_FLINLINE) {
 789                 ost_uuid = (struct obd_uuid *)src_oa->o_inline;
 790                 CDEBUG(D_HA, "clearing orphans only for %s\n",
 791                        ost_uuid->uuid);
 792         }
 793
 794         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
 795                 struct lov_stripe_md obj_md;
 796                 struct lov_stripe_md *obj_mdp = &obj_md;
 797                 int err;
 798
 799                 /* if called for a specific target, we don't
 800                    care if it is not active. */
 801                 if (lov->tgts[i].active == 0 && ost_uuid == NULL) {
 802                         CDEBUG(D_HA, "lov idx %d inactive\n", i);
 803                         continue;
 804                 }
 805
 806                 if (ost_uuid && !obd_uuid_equals(ost_uuid, &lov->tgts[i].uuid))
 807                         continue;
 808
 809                 memcpy(tmp_oa, src_oa, sizeof(*tmp_oa));
 810
 811                 /* XXX: LOV STACKING: use real "obj_mdp" sub-data */
 812                 err = obd_create(lov->tgts[i].ltd_exp, tmp_oa, &obj_mdp, oti);
 813                 if (err)
 814                         /* This export will be disabled until it is recovered,
 815                            and then orphan recovery will be completed. */
 816                         CERROR("error in orphan recovery on OST idx %d/%d: "
 817                                "rc = %d\n", i, lov->desc.ld_tgt_count, err);
 818
 819                 if (ost_uuid)
 820                         break;
 821         }
 822         obdo_free(tmp_oa);
 823         RETURN(rc);
 824 }
 825
 826 #define LOV_CREATE_RESEED_INTERVAL 1000
 827
 828 /* the LOV expects oa->o_id to be set to the LOV object id */
 829 static int lov_create(struct obd_export *exp, struct obdo *src_oa,
 830                       struct lov_stripe_md **ea, struct obd_trans_info *oti)
 831 {
 832         static int ost_start_idx, ost_start_count;
 833         struct lov_obd *lov;
 834         struct lov_stripe_md *lsm;
 835         struct lov_oinfo *loi = NULL;
 836         struct obdo *tmp_oa, *ret_oa;
 837         struct llog_cookie *cookies = NULL;
 838         unsigned ost_count, ost_idx;
 839         int set = 0, obj_alloc = 0, cookie_sent = 0, rc = 0, i;
 840         ENTRY;
 841
 842         LASSERT(ea != NULL);
 843
 844         if ((src_oa->o_valid & OBD_MD_FLFLAGS) &&
 845             src_oa->o_flags == OBD_FL_DELORPHAN) {
 846                 rc = lov_clear_orphans(exp, src_oa, ea, oti);
 847                 RETURN(rc);
 848         }
 849
 850         if (exp == NULL)
 851                 RETURN(-EINVAL);
 852
 853         lov = &exp->exp_obd->u.lov;
 854
 855         if (!lov->desc.ld_active_tgt_count)
 856                 RETURN(-EIO);
 857
 858         /* Recreate a specific object id at the given OST index */
 859         if ((src_oa->o_valid & OBD_MD_FLFLAGS) &&
 860             (src_oa->o_flags & OBD_FL_RECREATE_OBJS)) {
 861                  struct lov_stripe_md obj_md;
 862                  struct lov_stripe_md *obj_mdp = &obj_md;
 863
 864                  ost_idx = src_oa->o_nlink;
 865                  lsm = *ea;
 866                  if (lsm == NULL)
 867                         RETURN(-EINVAL);
 868                  if (ost_idx >= lov->desc.ld_tgt_count)
 869                          RETURN(-EINVAL);
 870                  for (i = 0; i < lsm->lsm_stripe_count; i++) {
 871                          if (lsm->lsm_oinfo[i].loi_ost_idx == ost_idx) {
 872                                  if (lsm->lsm_oinfo[i].loi_id != src_oa->o_id ||
 873                                      lsm->lsm_oinfo[i].loi_gr != src_oa->o_gr) {
 874                                          RETURN(-EINVAL);
 875                                  }
 876                                  break;
 877                          }
 878                  }
 879                  if (i == lsm->lsm_stripe_count)
 880                          RETURN(-EINVAL);
 881
 882                  rc = obd_create(lov->tgts[ost_idx].ltd_exp, src_oa,
 883                                  &obj_mdp, oti);
 884                  RETURN(rc);
 885         }
 886
 887         ret_oa = obdo_alloc();
 888         if (!ret_oa)
 889                 RETURN(-ENOMEM);
 890
 891         tmp_oa = obdo_alloc();
 892         if (!tmp_oa)
 893                 GOTO(out_oa, rc = -ENOMEM);
 894
 895         lsm = *ea;
 896         if (lsm == NULL) {
 897                 int stripes;
 898                 ost_count = lov_get_stripecnt(lov, 0);
 899
 900                 /* If the MDS file was truncated up to some size, stripe over
 901                  * enough OSTs to allow the file to be created at that size. */
 902                 if (src_oa->o_valid & OBD_MD_FLSIZE) {
 903                         stripes=((src_oa->o_size+LUSTRE_STRIPE_MAXBYTES)>>12)-1;
 904                         do_div(stripes, (__u32)(LUSTRE_STRIPE_MAXBYTES >> 12));
 905
 906                         if (stripes > lov->desc.ld_active_tgt_count)
 907                                 RETURN(-EFBIG);
 908                         if (stripes < ost_count)
 909                                 stripes = ost_count;
 910                 } else {
 911                         stripes = ost_count;
 912                 }
 913
 914                 rc = lov_alloc_memmd(&lsm, stripes, lov->desc.ld_pattern ?
 915                                      lov->desc.ld_pattern : LOV_PATTERN_RAID0);
 916                 if (rc < 0)
 917                         GOTO(out_tmp, rc);
 918
 919                 rc = 0;
 920         }
 921
 922         ost_count = lov->desc.ld_tgt_count;
 923
 924         LASSERT(src_oa->o_gr > 0);
 925         LASSERT(src_oa->o_valid & OBD_MD_FLID);
 926         lsm->lsm_object_id = src_oa->o_id;
 927         lsm->lsm_object_gr = src_oa->o_gr;
 928         if (!lsm->lsm_stripe_size)
 929                 lsm->lsm_stripe_size = lov->desc.ld_default_stripe_size;
 930         if (!lsm->lsm_pattern) {
 931                 lsm->lsm_pattern = lov->desc.ld_pattern ?
 932                         lov->desc.ld_pattern : LOV_PATTERN_RAID0;
 933         }
 934
 935         if (*ea == NULL || lsm->lsm_oinfo[0].loi_ost_idx >= ost_count) {
 936                 if (--ost_start_count <= 0) {
 937                         ost_start_idx = ll_insecure_random_int();
 938                         ost_start_count = LOV_CREATE_RESEED_INTERVAL;
 939                 } else if (lsm->lsm_stripe_count >=
 940                            lov->desc.ld_active_tgt_count) {
 941                         /* If we allocate from all of the stripes, make the
 942                          * next file start on the next OST. */
 943                         ++ost_start_idx;
 944                 }
 945                 ost_idx = ost_start_idx % ost_count;
 946         } else {
 947                 ost_idx = lsm->lsm_oinfo[0].loi_ost_idx;
 948         }
 949
 950         CDEBUG(D_INODE, "allocating %d subobjs for objid "LPX64" at idx %d\n",
 951                lsm->lsm_stripe_count, lsm->lsm_object_id, ost_idx);
 952
 953         /* XXX LOV STACKING: need to figure out how many real OSCs */
 954         if (oti && (src_oa->o_valid & OBD_MD_FLCOOKIE)) {
 955                 oti_alloc_cookies(oti, lsm->lsm_stripe_count);
 956                 if (!oti->oti_logcookies)
 957                         GOTO(out_cleanup, rc = -ENOMEM);
 958                 cookies = oti->oti_logcookies;
 959         }
 960
 961         loi = lsm->lsm_oinfo;
 962         for (i = 0; i < ost_count; i++, ost_idx = (ost_idx + 1) % ost_count) {
 963                 struct lov_stripe_md obj_md;
 964                 struct lov_stripe_md *obj_mdp = &obj_md;
 965                 int err;
 966
 967                 ++ost_start_idx;
 968                 if (lov->tgts[ost_idx].active == 0) {
 969                         if (!obd_uuid_empty(&lov->tgts[ost_idx].uuid))
 970                                 CDEBUG(D_HA, "lov idx %d inactive\n", ost_idx);
 971                         continue;
 972                 }
 973
 974                 /* create data objects with "parent" OA */
 975                 memcpy(tmp_oa, src_oa, sizeof(*tmp_oa));
 976
 977                 /* XXX When we start creating objects on demand, we need to
 978                  *     make sure that we always create the object on the
 979                  *     stripe which holds the existing file size.
 980                  */
 981                 if (src_oa->o_valid & OBD_MD_FLSIZE) {
 982                         if (lov_stripe_offset(lsm, src_oa->o_size, i,
 983                                               &tmp_oa->o_size) < 0 &&
 984                             tmp_oa->o_size)
 985                                 tmp_oa->o_size--;
 986
 987                         CDEBUG(D_INODE, "stripe %d has size "LPU64"/"LPU64"\n",
 988                                i, tmp_oa->o_size, src_oa->o_size);
 989                 }
 990
 991
 992                 /* XXX: LOV STACKING: use real "obj_mdp" sub-data */
 993                 err = obd_create(lov->tgts[ost_idx].ltd_exp, tmp_oa, &obj_mdp,
 994                                  oti);
 995                 if (err) {
 996                         if (lov->tgts[ost_idx].active) {
 997                                 CERROR("error creating objid "LPX64" sub-object"
 998                                        " on OST idx %d/%d: rc = %d\n",
 999                                        src_oa->o_id, ost_idx,
1000                                        lsm->lsm_stripe_count, err);
1001                                 if (err > 0) {
1002                                         CERROR("obd_create returned invalid "
1003                                                "err %d\n", err);
1004                                         err = -EIO;
1005                                 }
1006                         }
1007                         if (!rc)
1008                                 rc = err;
1009                         continue;
1010                 }
1011                 if (oti->oti_objid)
1012                         oti->oti_objid[ost_idx] = tmp_oa->o_id;
1013                 loi->loi_id = tmp_oa->o_id;
1014                 loi->loi_gr = tmp_oa->o_gr;
1015                 loi->loi_ost_idx = ost_idx;
1016                 loi->loi_ost_gen = lov->tgts[ost_idx].ltd_gen;
1017                 CDEBUG(D_INODE, "objid "LPX64" has subobj "LPX64" at "
1018                       "idx %d gen %d\n", lsm->lsm_object_id, loi->loi_id,
1019                        ost_idx, loi->loi_ost_gen);
1020
1021                 lov_merge_attrs(ret_oa, tmp_oa, tmp_oa->o_valid, lsm,
1022                                 obj_alloc, &set);
1023                 loi_init(loi);
1024
1025                 if (cookies)
1026                         ++oti->oti_logcookies;
1027                 if (tmp_oa->o_valid & OBD_MD_FLCOOKIE)
1028                         ++cookie_sent;
1029                 ++obj_alloc;
1030                 ++loi;
1031
1032                 /* If we have allocated enough objects, we are OK */
1033                 if (obj_alloc == lsm->lsm_stripe_count)
1034                         GOTO(out_done, rc = 0);
1035         }
1036
1037         if (obj_alloc == 0) {
1038                 if (rc == 0)
1039                         rc = -EIO;
1040                 GOTO(out_cleanup, rc);
1041         }
1042
1043         /* If we were passed specific striping params, then a failure to
1044          * meet those requirements is an error, since we can't reallocate
1045          * that memory (it might be part of a larger array or something).
1046          *
1047          * We can only get here if lsm_stripe_count was originally > 1.
1048          */
1049         if (*ea != NULL) {
1050                 CERROR("can't lstripe objid "LPX64": have %u want %u, rc %d\n",
1051                        lsm->lsm_object_id, obj_alloc, lsm->lsm_stripe_count,rc);
1052                 if (rc == 0)
1053                         rc = -EFBIG;
1054                 GOTO(out_cleanup, rc);
1055         } else {
1056                 struct lov_stripe_md *lsm_new;
1057                 /* XXX LOV STACKING call into osc for sizes */
1058                 unsigned oldsize, newsize;
1059
1060                 if (oti && cookies && cookie_sent) {
1061                         oldsize = lsm->lsm_stripe_count * sizeof(*cookies);
1062                         newsize = obj_alloc * sizeof(*cookies);
1063
1064                         oti_alloc_cookies(oti, obj_alloc);
1065                         if (oti->oti_logcookies) {
1066                                 memcpy(oti->oti_logcookies, cookies, newsize);
1067                                 OBD_FREE(cookies, oldsize);
1068                                 cookies = oti->oti_logcookies;
1069                         } else {
1070                                 CWARN("'leaking' %d bytes\n", oldsize-newsize);
1071                         }
1072                 }
1073
1074                 CWARN("using fewer stripes for object "LPX64": old %u new %u\n",
1075                       lsm->lsm_object_id, lsm->lsm_stripe_count, obj_alloc);
1076                 oldsize = lov_stripe_md_size(lsm->lsm_stripe_count);
1077                 newsize = lov_stripe_md_size(obj_alloc);
1078                 OBD_ALLOC(lsm_new, newsize);
1079                 if (lsm_new != NULL) {
1080                         memcpy(lsm_new, lsm, newsize);
1081                         lsm_new->lsm_stripe_count = obj_alloc;
1082                         OBD_FREE(lsm, oldsize);
1083                         lsm = lsm_new;
1084                 } else {
1085                         CWARN("'leaking' %d bytes\n", oldsize - newsize);
1086                 }
1087                 rc = 0;
1088         }
1089         EXIT;
1090  out_done:
1091         *ea = lsm;
1092         if (src_oa->o_valid & OBD_MD_FLSIZE &&
1093             ret_oa->o_size != src_oa->o_size) {
1094                 CERROR("original size "LPU64" isn't new object size "LPU64"\n",
1095                        src_oa->o_size, ret_oa->o_size);
1096                 LBUG();
1097         }
1098         ret_oa->o_id = src_oa->o_id;
1099         ret_oa->o_gr = src_oa->o_gr;
1100         ret_oa->o_valid |= OBD_MD_FLGROUP;
1101         memcpy(src_oa, ret_oa, sizeof(*src_oa));
1102
1103  out_tmp:
1104         obdo_free(tmp_oa);
1105  out_oa:
1106         obdo_free(ret_oa);
1107         if (oti && cookies) {
1108                 oti->oti_logcookies = cookies;
1109                 if (!cookie_sent) {
1110                         oti_free_cookies(oti);
1111                         src_oa->o_valid &= ~OBD_MD_FLCOOKIE;
1112                 } else {
1113                         src_oa->o_valid |= OBD_MD_FLCOOKIE;
1114                 }
1115         }
1116         RETURN(rc);
1117
1118  out_cleanup:
1119         while (obj_alloc-- > 0) {
1120                 struct obd_export *sub_exp;
1121                 int err;
1122
1123                 --loi;
1124                 sub_exp = lov->tgts[loi->loi_ost_idx].ltd_exp;
1125                 /* destroy already created objects here */
1126                 memcpy(tmp_oa, src_oa, sizeof(*tmp_oa));
1127                 tmp_oa->o_id = loi->loi_id;
1128
1129                 err = obd_destroy(sub_exp, tmp_oa, NULL, oti);
1130                 if (err)
1131                         CERROR("Failed to uncreate objid "LPX64" subobj "LPX64
1132                                " on OST idx %d: rc = %d\n", src_oa->o_id,
1133                                loi->loi_id, loi->loi_ost_idx, err);
1134         }
1135         if (*ea == NULL)
1136                 obd_free_memmd(exp, &lsm);
1137         goto out_tmp;
1138 }
1139
1140 static int lov_revalidate_policy(struct lov_obd *lov, struct lov_stripe_md *lsm)
1141 {
1142         static int next_idx = 0;
1143         struct lov_tgt_desc *tgt;
1144         int i, count;
1145
1146         /* XXX - we should do something clever and take lsm
1147          * into account but just do round robin for now. */
1148
1149         /* last_idx must always be less that count because
1150          * ld_tgt_count currently cannot shrink. */
1151         count = lov->desc.ld_tgt_count;
1152
1153         for (i = next_idx, tgt = lov->tgts + i; i < count; i++, tgt++) {
1154                 if (tgt->active) {
1155                         next_idx = (i + 1) % count;
1156                         RETURN(i);
1157                 }
1158         }
1159
1160         for (i = 0, tgt = lov->tgts; i < next_idx; i++, tgt++) {
1161                 if (tgt->active) {
1162                         next_idx = (i + 1) % count;
1163                         RETURN(i);
1164                 }
1165         }
1166
1167         RETURN(-EIO);
1168 }
1169
1170 #define lsm_bad_magic(LSMP)                                     \
1171 ({                                                              \
1172         struct lov_stripe_md *_lsm__ = (LSMP);                  \
1173         int _ret__ = 0;                                         \
1174         if (!_lsm__) {                                          \
1175                 CERROR("LOV requires striping ea\n");           \
1176                 _ret__ = 1;                                     \
1177         } else if (_lsm__->lsm_magic != LOV_MAGIC) {            \
1178                 CERROR("LOV striping magic bad %#x != %#x\n",   \
1179                        _lsm__->lsm_magic, LOV_MAGIC);           \
1180                 _ret__ = 1;                                     \
1181         }                                                       \
1182         _ret__;                                                 \
1183 })
1184
1185 static int lov_destroy(struct obd_export *exp, struct obdo *oa,
1186                        struct lov_stripe_md *lsm, struct obd_trans_info *oti)
1187 {
1188         struct obdo tmp;
1189         struct lov_obd *lov;
1190         struct lov_oinfo *loi;
1191         int rc = 0, i;
1192         ENTRY;
1193
1194         if (lsm_bad_magic(lsm))
1195                 RETURN(-EINVAL);
1196
1197         if (!exp || !exp->exp_obd)
1198                 RETURN(-ENODEV);
1199
1200         lov = &exp->exp_obd->u.lov;
1201         loi = lsm->lsm_oinfo;
1202         for (i = 0; i < lsm->lsm_stripe_count; i++, loi++) {
1203                 int err;
1204
1205                 if (lov->tgts[loi->loi_ost_idx].active == 0) {
1206                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
1207                         /* Orphan clean up will (someday) fix this up. */
1208                         if (oti != NULL && oa->o_valid & OBD_MD_FLCOOKIE)
1209                                 oti->oti_logcookies++;
1210                         continue;
1211                 }
1212
1213                 memcpy(&tmp, oa, sizeof(tmp));
1214                 tmp.o_id = loi->loi_id;
1215                 err = obd_destroy(lov->tgts[loi->loi_ost_idx].ltd_exp, &tmp,
1216                                   NULL, oti);
1217                 if (err && lov->tgts[loi->loi_ost_idx].active) {
1218                         CDEBUG(D_INODE, "error: destroying objid "LPX64" subobj "
1219                                LPX64" on OST idx %d: rc = %d\n",
1220                                oa->o_id, loi->loi_id, loi->loi_ost_idx, err);
1221                         if (!rc)
1222                                 rc = err;
1223                 }
1224         }
1225         RETURN(rc);
1226 }
1227
1228 static int lov_getattr(struct obd_export *exp, struct obdo *oa,
1229                        struct lov_stripe_md *lsm)
1230 {
1231         struct obdo tmp;
1232         struct lov_obd *lov;
1233         struct lov_oinfo *loi;
1234         int i, rc = 0, set = 0;
1235         ENTRY;
1236
1237         if (lsm_bad_magic(lsm))
1238                 RETURN(-EINVAL);
1239
1240         if (!exp || !exp->exp_obd)
1241                 RETURN(-ENODEV);
1242
1243         lov = &exp->exp_obd->u.lov;
1244
1245         CDEBUG(D_INFO, "objid "LPX64": %ux%u byte stripes\n",
1246                lsm->lsm_object_id, lsm->lsm_stripe_count, lsm->lsm_stripe_size);
1247         for (i = 0,loi = lsm->lsm_oinfo; i < lsm->lsm_stripe_count; i++,loi++) {
1248                 int err;
1249
1250                 if (lov->tgts[loi->loi_ost_idx].active == 0) {
1251                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
1252                         continue;
1253                 }
1254
1255                 CDEBUG(D_INFO, "objid "LPX64"[%d] has subobj "LPX64" at idx "
1256                        "%u\n", oa->o_id, i, loi->loi_id, loi->loi_ost_idx);
1257                 /* create data objects with "parent" OA */
1258                 memcpy(&tmp, oa, sizeof(tmp));
1259                 tmp.o_id = loi->loi_id;
1260
1261                 err = obd_getattr(lov->tgts[loi->loi_ost_idx].ltd_exp, &tmp,
1262                                   NULL);
1263                 if (err) {
1264                         if (lov->tgts[loi->loi_ost_idx].active) {
1265                                 CERROR("error: getattr objid "LPX64" subobj "
1266                                        LPX64" on OST idx %d: rc = %d\n",
1267                                        oa->o_id, loi->loi_id, loi->loi_ost_idx,
1268                                        err);
1269                                 RETURN(err);
1270                         }
1271                 } else {
1272                         lov_merge_attrs(oa, &tmp, tmp.o_valid, lsm, i, &set);
1273                 }
1274         }
1275         if (!set)
1276                 rc = -EIO;
1277         RETURN(rc);
1278 }
1279
1280 static int lov_getattr_interpret(struct ptlrpc_request_set *rqset, void *data,
1281                                  int rc)
1282 {
1283         struct lov_getattr_async_args *aa = data;
1284         struct lov_stripe_md *lsm = aa->aa_lsm;
1285         struct obdo          *oa = aa->aa_oa;
1286         struct obdo          *obdos = aa->aa_obdos;
1287         struct lov_oinfo     *loi;
1288         int                   i;
1289         int                   set = 0;
1290         ENTRY;
1291
1292         if (rc == 0) {
1293                 /* NB all stripe requests succeeded to get here */
1294
1295                 loi = lsm->lsm_oinfo;
1296                 for (i = 0; i < lsm->lsm_stripe_count; i++, loi++) {
1297                         if (obdos[i].o_valid == 0)      /* inactive stripe */
1298                                 continue;
1299
1300                         lov_merge_attrs(oa, &obdos[i], obdos[i].o_valid, lsm,
1301                                         i, &set);
1302                 }
1303
1304                 if (!set) {
1305                         CERROR ("No stripes had valid attrs\n");
1306                         rc = -EIO;
1307                 }
1308         }
1309
1310         OBD_FREE (obdos, lsm->lsm_stripe_count * sizeof (*obdos));
1311         RETURN (rc);
1312 }
1313
1314 static int lov_getattr_async(struct obd_export *exp, struct obdo *oa,
1315                               struct lov_stripe_md *lsm,
1316                               struct ptlrpc_request_set *rqset)
1317 {
1318         struct obdo *obdos;
1319         struct lov_obd *lov;
1320         struct lov_oinfo *loi;
1321         struct lov_getattr_async_args *aa;
1322         int i, rc = 0, set = 0;
1323         ENTRY;
1324
1325         if (lsm_bad_magic(lsm))
1326                 RETURN(-EINVAL);
1327
1328         if (!exp || !exp->exp_obd)
1329                 RETURN(-ENODEV);
1330
1331         lov = &exp->exp_obd->u.lov;
1332
1333         OBD_ALLOC (obdos, lsm->lsm_stripe_count * sizeof (*obdos));
1334         if (obdos == NULL)
1335                 RETURN(-ENOMEM);
1336
1337         CDEBUG(D_INFO, "objid "LPX64": %ux%u byte stripes\n",
1338                lsm->lsm_object_id, lsm->lsm_stripe_count, lsm->lsm_stripe_size);
1339         for (i = 0,loi = lsm->lsm_oinfo; i < lsm->lsm_stripe_count; i++,loi++) {
1340                 int err;
1341
1342                 if (lov->tgts[loi->loi_ost_idx].active == 0) {
1343                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
1344                         /* leaves obdos[i].obd_valid unset */
1345                         continue;
1346                 }
1347
1348                 CDEBUG(D_INFO, "objid "LPX64"[%d] has subobj "LPX64" at "
1349                        "idx %u gen %d\n", oa->o_id, i, loi->loi_id,
1350                        loi->loi_ost_idx, loi->loi_ost_gen);
1351
1352                 /* create data objects with "parent" OA */
1353                 memcpy(&obdos[i], oa, sizeof(obdos[i]));
1354                 obdos[i].o_id = loi->loi_id;
1355
1356                 err = obd_getattr_async(lov->tgts[loi->loi_ost_idx].ltd_exp,
1357                                          &obdos[i], NULL, rqset);
1358                 if (err) {
1359                         CERROR("error: getattr objid "LPX64" subobj "
1360                                LPX64" on OST idx %d: rc = %d\n",
1361                                oa->o_id, loi->loi_id, loi->loi_ost_idx,
1362                                err);
1363                         GOTO(out_obdos, rc = err);
1364                 }
1365                 set = 1;
1366         }
1367         if (!set)
1368                 GOTO (out_obdos, rc = -EIO);
1369
1370         LASSERT (rqset->set_interpret == NULL);
1371         rqset->set_interpret = lov_getattr_interpret;
1372         LASSERT (sizeof (rqset->set_args) >= sizeof (*aa));
1373         aa = (struct lov_getattr_async_args *)&rqset->set_args;
1374         aa->aa_lsm = lsm;
1375         aa->aa_oa = oa;
1376         aa->aa_obdos = obdos;
1377         aa->aa_lov = lov;
1378         GOTO(out, rc = 0);
1379
1380 out_obdos:
1381         OBD_FREE (obdos, lsm->lsm_stripe_count * sizeof (*obdos));
1382 out:
1383         RETURN(rc);
1384 }
1385
1386
1387 static int lov_setattr(struct obd_export *exp, struct obdo *src_oa,
1388                        struct lov_stripe_md *lsm, struct obd_trans_info *oti)
1389 {
1390         struct obdo *tmp_oa, *ret_oa;
1391         struct lov_obd *lov;
1392         struct lov_oinfo *loi;
1393         int rc = 0, i, set = 0;
1394         ENTRY;
1395
1396         if (lsm_bad_magic(lsm))
1397                 RETURN(-EINVAL);
1398
1399         if (!exp || !exp->exp_obd)
1400                 RETURN(-ENODEV);
1401
1402         /* for now, we only expect time updates here */
1403         LASSERT(!(src_oa->o_valid & ~(OBD_MD_FLID|OBD_MD_FLTYPE | OBD_MD_FLMODE|
1404                                       OBD_MD_FLATIME | OBD_MD_FLMTIME |
1405                                       OBD_MD_FLCTIME | OBD_MD_FLFLAGS |
1406                                       OBD_MD_FLSIZE | OBD_MD_FLGROUP)));
1407
1408         LASSERT(!(src_oa->o_valid & OBD_MD_FLGROUP) || src_oa->o_gr > 0);
1409
1410         ret_oa = obdo_alloc();
1411         if (!ret_oa)
1412                 RETURN(-ENOMEM);
1413
1414         tmp_oa = obdo_alloc();
1415         if (!tmp_oa)
1416                 GOTO(out_oa, rc = -ENOMEM);
1417
1418         lov = &exp->exp_obd->u.lov;
1419         for (i = 0,loi = lsm->lsm_oinfo; i < lsm->lsm_stripe_count; i++,loi++) {
1420                 int err;
1421
1422                 if (lov->tgts[loi->loi_ost_idx].active == 0) {
1423                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
1424                         continue;
1425                 }
1426
1427                 memcpy(tmp_oa, src_oa, sizeof(*tmp_oa));
1428                 tmp_oa->o_id = loi->loi_id;
1429                 LASSERT(!(tmp_oa->o_valid & OBD_MD_FLGROUP) || tmp_oa->o_gr>0);
1430
1431                 if (src_oa->o_valid & OBD_MD_FLSIZE) {
1432                         if (lov_stripe_offset(lsm, src_oa->o_size, i,
1433                                               &tmp_oa->o_size) < 0 &&
1434                             tmp_oa->o_size)
1435                                 tmp_oa->o_size--;
1436
1437                         CDEBUG(D_INODE, "stripe %d has size "LPU64"/"LPU64"\n",
1438                                i, tmp_oa->o_size, src_oa->o_size);
1439                 }
1440
1441                 err = obd_setattr(lov->tgts[loi->loi_ost_idx].ltd_exp, tmp_oa,
1442                                   NULL, NULL);
1443                 if (err) {
1444                         if (lov->tgts[loi->loi_ost_idx].active) {
1445                                 CERROR("error: setattr objid "LPX64" subobj "
1446                                        LPX64" on OST idx %d: rc = %d\n",
1447                                        src_oa->o_id, loi->loi_id,
1448                                        loi->loi_ost_idx, err);
1449                                 if (!rc)
1450                                         rc = err;
1451                         }
1452                         continue;
1453                 }
1454                 lov_merge_attrs(ret_oa, tmp_oa, tmp_oa->o_valid, lsm, i, &set);
1455         }
1456         if (!set && !rc)
1457                 rc = -EIO;
1458
1459         ret_oa->o_id = src_oa->o_id;
1460         memcpy(src_oa, ret_oa, sizeof(*src_oa));
1461         GOTO(out_tmp, rc);
1462 out_tmp:
1463         obdo_free(tmp_oa);
1464 out_oa:
1465         obdo_free(ret_oa);
1466         return rc;
1467 }
1468
1469 /* we have an offset in file backed by an lov and want to find out where
1470  * that offset lands in our given stripe of the file.  for the easy
1471  * case where the offset is within the stripe, we just have to scale the
1472  * offset down to make it relative to the stripe instead of the lov.
1473  *
1474  * the harder case is what to do when the offset doesn't intersect the
1475  * stripe.  callers will want start offsets clamped ahead to the start
1476  * of the nearest stripe in the file.  end offsets similarly clamped to the
1477  * nearest ending byte of a stripe in the file:
1478  *
1479  * all this function does is move offsets to the nearest region of the
1480  * stripe, and it does its work "mod" the full length of all the stripes.
1481  * consider a file with 3 stripes:
1482  *
1483  *             S                                              E
1484  * ---------------------------------------------------------------------
1485  * |    0    |     1     |     2     |    0    |     1     |     2     |
1486  * ---------------------------------------------------------------------
1487  *
1488  * to find stripe 1's offsets for S and E, it divides by the full stripe
1489  * width and does its math in the context of a single set of stripes:
1490  *
1491  *             S         E
1492  * -----------------------------------
1493  * |    0    |     1     |     2     |
1494  * -----------------------------------
1495  *
1496  * it'll notice that E is outside stripe 1 and clamp it to the end of the
1497  * stripe, then multiply it back out by lov_off to give the real offsets in
1498  * the stripe:
1499  *
1500  *   S                   E
1501  * ---------------------------------------------------------------------
1502  * |    1    |     1     |     1     |    1    |     1     |     1     |
1503  * ---------------------------------------------------------------------
1504  *
1505  * it would have done similarly and pulled S forward to the start of a 1
1506  * stripe if, say, S had landed in a 0 stripe.
1507  *
1508  * this rounding isn't always correct.  consider an E lov offset that lands
1509  * on a 0 stripe, the "mod stripe width" math will pull it forward to the
1510  * start of a 1 stripe, when in fact it wanted to be rounded back to the end
1511  * of a previous 1 stripe.  this logic is handled by callers and this is why:
1512  *
1513  * this function returns < 0 when the offset was "before" the stripe and
1514  * was moved forward to the start of the stripe in question;  0 when it
1515  * falls in the stripe and no shifting was done; > 0 when the offset
1516  * was outside the stripe and was pulled back to its final byte. */
1517 static int lov_stripe_offset(struct lov_stripe_md *lsm, obd_off lov_off,
1518                              int stripeno, obd_off *obd_off)
1519 {
1520         unsigned long ssize  = lsm->lsm_stripe_size;
1521         unsigned long swidth = ssize * lsm->lsm_stripe_count;
1522         unsigned long stripe_off, this_stripe;
1523         int ret = 0;
1524
1525         if (lov_off == OBD_OBJECT_EOF) {
1526                 *obd_off = OBD_OBJECT_EOF;
1527                 return 0;
1528         }
1529
1530         /* do_div(a, b) returns a % b, and a = a / b */
1531         stripe_off = do_div(lov_off, swidth);
1532
1533         this_stripe = stripeno * ssize;
1534         if (stripe_off < this_stripe) {
1535                 stripe_off = 0;
1536                 ret = -1;
1537         } else {
1538                 stripe_off -= this_stripe;
1539
1540                 if (stripe_off >= ssize) {
1541                         stripe_off = ssize;
1542                         ret = 1;
1543                 }
1544         }
1545
1546         *obd_off = lov_off * ssize + stripe_off;
1547         return ret;
1548 }
1549
1550 /* Given a whole-file size and a stripe number, give the file size which
1551  * corresponds to the individual object of that stripe.
1552  *
1553  * This behaves basically in the same was as lov_stripe_offset, except that
1554  * file sizes falling before the beginning of a stripe are clamped to the end
1555  * of the previous stripe, not the beginning of the next:
1556  *
1557  *                                               S
1558  * ---------------------------------------------------------------------
1559  * |    0    |     1     |     2     |    0    |     1     |     2     |
1560  * ---------------------------------------------------------------------
1561  *
1562  * if clamped to stripe 2 becomes:
1563  *
1564  *                                   S
1565  * ---------------------------------------------------------------------
1566  * |    0    |     1     |     2     |    0    |     1     |     2     |
1567  * ---------------------------------------------------------------------
1568  */
1569 static obd_off lov_size_to_stripe(struct lov_stripe_md *lsm, obd_off file_size,
1570                                   int stripeno)
1571 {
1572         unsigned long ssize  = lsm->lsm_stripe_size;
1573         unsigned long swidth = ssize * lsm->lsm_stripe_count;
1574         unsigned long stripe_off, this_stripe;
1575
1576         if (file_size == OBD_OBJECT_EOF)
1577                 return OBD_OBJECT_EOF;
1578
1579         /* do_div(a, b) returns a % b, and a = a / b */
1580         stripe_off = do_div(file_size, swidth);
1581
1582         this_stripe = stripeno * ssize;
1583         if (stripe_off < this_stripe) {
1584                 /* Move to end of previous stripe, or zero */
1585                 if (file_size > 0) {
1586                         file_size--;
1587                         stripe_off = ssize;
1588                 } else {
1589                         stripe_off = 0;
1590                 }
1591         } else {
1592                 stripe_off -= this_stripe;
1593
1594                 if (stripe_off >= ssize) {
1595                         /* Clamp to end of this stripe */
1596                         stripe_off = ssize;
1597                 }
1598         }
1599
1600         return (file_size * ssize + stripe_off);
1601 }
1602
1603 /* given an extent in an lov and a stripe, calculate the extent of the stripe
1604  * that is contained within the lov extent.  this returns true if the given
1605  * stripe does intersect with the lov extent. */
1606 static int lov_stripe_intersects(struct lov_stripe_md *lsm, int stripeno,
1607                                  obd_off start, obd_off end,
1608                                  obd_off *obd_start, obd_off *obd_end)
1609 {
1610         int start_side = 0, end_side = 0;
1611
1612         switch (lsm->lsm_pattern) {
1613         case LOV_PATTERN_RAID0:
1614                 start_side = lov_stripe_offset(lsm, start, stripeno, obd_start);
1615                 end_side = lov_stripe_offset(lsm, end, stripeno, obd_end);
1616                 break;
1617         case LOV_PATTERN_CMOBD:
1618                 *obd_start = start;
1619                 *obd_end = end;
1620                 start_side = end_side = 0;
1621                 break;
1622         default:
1623                 LBUG();
1624         }
1625
1626         CDEBUG(D_INODE, "["LPU64"->"LPU64"] -> [(%d) "LPU64"->"LPU64" (%d)]\n",
1627                start, end, start_side, *obd_start, *obd_end, end_side);
1628
1629         /* this stripe doesn't intersect the file extent when neither
1630          * start or the end intersected the stripe and obd_start and
1631          * obd_end got rounded up to the save value. */
1632         if (start_side != 0 && end_side != 0 && *obd_start == *obd_end)
1633                 return 0;
1634
1635         /* as mentioned in the lov_stripe_offset commentary, end
1636          * might have been shifted in the wrong direction.  This
1637          * happens when an end offset is before the stripe when viewed
1638          * through the "mod stripe size" math. we detect it being shifted
1639          * in the wrong direction and touch it up.
1640          * interestingly, this can't underflow since end must be > start
1641          * if we passed through the previous check.
1642          * (should we assert for that somewhere?) */
1643         if (end_side != 0)
1644                 (*obd_end)--;
1645
1646         return 1;
1647 }
1648
1649 /* compute which stripe number "lov_off" will be written into */
1650 static int lov_stripe_number(struct lov_stripe_md *lsm, obd_off lov_off)
1651 {
1652         unsigned long ssize  = lsm->lsm_stripe_size;
1653         unsigned long swidth = ssize * lsm->lsm_stripe_count;
1654         unsigned long stripe_off;
1655
1656         if (lsm->lsm_pattern == LOV_PATTERN_CMOBD)
1657                 return 0;
1658
1659         stripe_off = do_div(lov_off, swidth);
1660
1661         return stripe_off / ssize;
1662 }
1663
1664 static int lov_revalidate_md(struct obd_export *exp, struct obdo *src_oa,
1665                              struct lov_stripe_md *ea,
1666                              struct obd_trans_info *oti)
1667 {
1668         struct obd_export *osc_exp;
1669         struct lov_obd *lov = &exp->exp_obd->u.lov;
1670         struct lov_stripe_md *lsm = ea;
1671         struct lov_stripe_md obj_md;
1672         struct lov_stripe_md *obj_mdp = &obj_md;
1673         struct lov_oinfo *loi;
1674         struct obdo *tmp_oa;
1675         int ost_idx, updates = 0, i;
1676         ENTRY;
1677
1678         tmp_oa = obdo_alloc();
1679         if (tmp_oa == NULL)
1680                 RETURN(-ENOMEM);
1681
1682         loi = lsm->lsm_oinfo;
1683         for (i = 0; i < lsm->lsm_stripe_count; i++, loi++) {
1684                 int rc;
1685                 if (!obd_uuid_empty(&lov->tgts[loi->loi_ost_idx].uuid))
1686                         continue;
1687
1688                 ost_idx = lov_revalidate_policy(lov, lsm);
1689                 if (ost_idx < 0) {
1690                         /* FIXME: punt for now. */
1691                         CERROR("lov_revalidate_policy failed; no active "
1692                                "OSCs?\n");
1693                         continue;
1694                 }
1695
1696                 /* create a new object */
1697                 memcpy(tmp_oa, src_oa, sizeof(*tmp_oa));
1698                 /* XXX: LOV STACKING: use real "obj_mdp" sub-data */
1699                 osc_exp = lov->tgts[ost_idx].ltd_exp;
1700                 rc = obd_create(osc_exp, tmp_oa, &obj_mdp, oti);
1701                 if (rc) {
1702                         CERROR("error creating new subobj at idx %d; "
1703                                "rc = %d\n", ost_idx, rc);
1704                         continue;
1705                 }
1706                 if (oti->oti_objid)
1707                         oti->oti_objid[ost_idx] = tmp_oa->o_id;
1708                 loi->loi_id = tmp_oa->o_id;
1709                 loi->loi_ost_idx = ost_idx;
1710                 loi->loi_ost_gen = lov->tgts[ost_idx].ltd_gen;
1711                 CDEBUG(D_INODE, "replacing objid "LPX64" subobj "LPX64
1712                        " with idx %d gen %d.\n", lsm->lsm_object_id,
1713                        loi->loi_id, ost_idx, loi->loi_ost_gen);
1714                 updates = 1;
1715         }
1716
1717         /* If we got an error revalidating an entry there's no need to
1718          * cleanup up objects we allocated here because the bad entry
1719          * still points to a deleted OST. */
1720
1721         obdo_free(tmp_oa);
1722         RETURN(updates);
1723 }
1724
1725 /* FIXME: maybe we'll just make one node the authoritative attribute node, then
1726  * we can send this 'punch' to just the authoritative node and the nodes
1727  * that the punch will affect. */
1728 static int lov_punch(struct obd_export *exp, struct obdo *oa,
1729                      struct lov_stripe_md *lsm,
1730                      obd_off start, obd_off end, struct obd_trans_info *oti)
1731 {
1732         struct obdo tmp;
1733         struct lov_obd *lov;
1734         struct lov_oinfo *loi;
1735         int rc = 0, i;
1736         ENTRY;
1737
1738         if (lsm_bad_magic(lsm))
1739                 RETURN(-EINVAL);
1740
1741         if (!exp || !exp->exp_obd)
1742                 RETURN(-ENODEV);
1743
1744         lov = &exp->exp_obd->u.lov;
1745         for (i = 0,loi = lsm->lsm_oinfo; i < lsm->lsm_stripe_count; i++,loi++) {
1746                 obd_off starti, endi;
1747                 int err;
1748
1749                 if (lov->tgts[loi->loi_ost_idx].active == 0) {
1750                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
1751                         continue;
1752                 }
1753
1754                 if (!lov_stripe_intersects(lsm, i, start, end, &starti, &endi))
1755                         continue;
1756
1757                 /* create data objects with "parent" OA */
1758                 memcpy(&tmp, oa, sizeof(tmp));
1759                 tmp.o_id = loi->loi_id;
1760
1761                 err = obd_punch(lov->tgts[loi->loi_ost_idx].ltd_exp, &tmp, NULL,
1762                                 starti, endi, NULL);
1763                 if (err) {
1764                         if (lov->tgts[loi->loi_ost_idx].active) {
1765                                 CERROR("error: punch objid "LPX64" subobj "LPX64
1766                                        " on OST idx %d: rc = %d\n", oa->o_id,
1767                                        loi->loi_id, loi->loi_ost_idx, err);
1768                         }
1769                         if (!rc)
1770                                 rc = err;
1771                 } else {
1772                         loi->loi_kms = loi->loi_rss = starti;
1773                 }
1774         }
1775         RETURN(rc);
1776 }
1777
1778 static int lov_sync(struct obd_export *exp, struct obdo *oa,
1779                     struct lov_stripe_md *lsm, obd_off start, obd_off end)
1780 {
1781         struct obdo *tmp;
1782         struct lov_obd *lov;
1783         struct lov_oinfo *loi;
1784         int rc = 0, i;
1785         ENTRY;
1786
1787         if (lsm_bad_magic(lsm))
1788                 RETURN(-EINVAL);
1789
1790         if (!exp->exp_obd)
1791                 RETURN(-ENODEV);
1792
1793         tmp = obdo_alloc();
1794         if (!tmp)
1795                 RETURN(-ENOMEM);
1796
1797         lov = &exp->exp_obd->u.lov;
1798         for (i = 0,loi = lsm->lsm_oinfo; i < lsm->lsm_stripe_count; i++,loi++) {
1799                 obd_off starti, endi;
1800                 int err;
1801
1802                 if (lov->tgts[loi->loi_ost_idx].active == 0) {
1803                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
1804                         continue;
1805                 }
1806
1807                 if (!lov_stripe_intersects(lsm, i, start, end, &starti, &endi))
1808                         continue;
1809
1810                 memcpy(tmp, oa, sizeof(*tmp));
1811                 tmp->o_id = loi->loi_id;
1812
1813                 err = obd_sync(lov->tgts[loi->loi_ost_idx].ltd_exp, tmp, NULL,
1814                                starti, endi);
1815                 if (err) {
1816                         if (lov->tgts[loi->loi_ost_idx].active) {
1817                                 CERROR("error: fsync objid "LPX64" subobj "LPX64
1818                                        " on OST idx %d: rc = %d\n", oa->o_id,
1819                                        loi->loi_id, loi->loi_ost_idx, err);
1820                         }
1821                         if (!rc)
1822                                 rc = err;
1823                 }
1824         }
1825
1826         obdo_free(tmp);
1827         RETURN(rc);
1828 }
1829
1830 static int lov_brw_check(struct lov_obd *lov, struct obdo *oa,
1831                          struct lov_stripe_md *lsm,
1832                          obd_count oa_bufs, struct brw_page *pga)
1833 {
1834         int i, rc = 0;
1835         ENTRY;
1836
1837         /* The caller just wants to know if there's a chance that this
1838          * I/O can succeed */
1839         for (i = 0; i < oa_bufs; i++) {
1840                 int stripe = lov_stripe_number(lsm, pga[i].disk_offset);
1841                 int ost = lsm->lsm_oinfo[stripe].loi_ost_idx;
1842                 obd_off start, end;
1843
1844                 if (!lov_stripe_intersects(lsm, i, pga[i].disk_offset,
1845                                            pga[i].disk_offset + pga[i].count,
1846                                            &start, &end))
1847                         continue;
1848
1849                 if (lov->tgts[ost].active == 0) {
1850                         CDEBUG(D_HA, "lov idx %d inactive\n", ost);
1851                         RETURN(-EIO);
1852                 }
1853                 rc = obd_brw(OBD_BRW_CHECK, lov->tgts[ost].ltd_exp, oa,
1854                              NULL, 1, &pga[i], NULL);
1855                 if (rc)
1856                         break;
1857         }
1858         RETURN(rc);
1859 }
1860
1861 static int lov_brw(int cmd, struct obd_export *exp, struct obdo *src_oa,
1862                    struct lov_stripe_md *lsm, obd_count oa_bufs,
1863                    struct brw_page *pga, struct obd_trans_info *oti)
1864 {
1865         struct {
1866                 int bufct;
1867                 int index;
1868                 int subcount;
1869                 struct lov_stripe_md lsm;
1870                 int ost_idx;
1871         } *stripeinfo, *si, *si_last;
1872         struct obdo *ret_oa = NULL, *tmp_oa = NULL;
1873         struct lov_obd *lov;
1874         struct brw_page *ioarr;
1875         struct lov_oinfo *loi;
1876         int rc = 0, i, *where, stripe_count = lsm->lsm_stripe_count, set = 0;
1877         ENTRY;
1878
1879         if (lsm_bad_magic(lsm))
1880                 RETURN(-EINVAL);
1881
1882         lov = &exp->exp_obd->u.lov;
1883
1884         if (cmd == OBD_BRW_CHECK) {
1885                 rc = lov_brw_check(lov, src_oa, lsm, oa_bufs, pga);
1886                 RETURN(rc);
1887         }
1888
1889         OBD_ALLOC(stripeinfo, stripe_count * sizeof(*stripeinfo));
1890         if (!stripeinfo)
1891                 RETURN(-ENOMEM);
1892
1893         OBD_ALLOC(where, sizeof(*where) * oa_bufs);
1894         if (!where)
1895                 GOTO(out_sinfo, rc = -ENOMEM);
1896
1897         OBD_ALLOC(ioarr, sizeof(*ioarr) * oa_bufs);
1898         if (!ioarr)
1899                 GOTO(out_where, rc = -ENOMEM);
1900
1901         if (src_oa) {
1902                 ret_oa = obdo_alloc();
1903                 if (!ret_oa)
1904                         GOTO(out_ioarr, rc = -ENOMEM);
1905
1906                 tmp_oa = obdo_alloc();
1907                 if (!tmp_oa)
1908                         GOTO(out_oa, rc = -ENOMEM);
1909         }
1910
1911         for (i = 0; i < oa_bufs; i++) {
1912                 where[i] = lov_stripe_number(lsm, pga[i].disk_offset);
1913                 stripeinfo[where[i]].bufct++;
1914         }
1915
1916         for (i = 0, loi = lsm->lsm_oinfo, si_last = si = stripeinfo;
1917              i < stripe_count; i++, loi++, si_last = si, si++) {
1918                 if (i > 0)
1919                         si->index = si_last->index + si_last->bufct;
1920                 si->lsm.lsm_object_id = loi->loi_id;
1921                 si->lsm.lsm_object_gr = lsm->lsm_object_gr;
1922                 si->ost_idx = loi->loi_ost_idx;
1923         }
1924
1925         for (i = 0; i < oa_bufs; i++) {
1926                 int which = where[i];
1927                 int shift;
1928
1929                 shift = stripeinfo[which].index + stripeinfo[which].subcount;
1930                 LASSERT(shift < oa_bufs);
1931                 ioarr[shift] = pga[i];
1932                 lov_stripe_offset(lsm, pga[i].disk_offset, which,
1933                                   &ioarr[shift].disk_offset);
1934                 stripeinfo[which].subcount++;
1935         }
1936
1937         for (i = 0, si = stripeinfo; i < stripe_count; i++, si++) {
1938                 int shift = si->index;
1939
1940                 if (lov->tgts[si->ost_idx].active == 0) {
1941                         CDEBUG(D_HA, "lov idx %d inactive\n", si->ost_idx);
1942                         GOTO(out_oa, rc = -EIO);
1943                 }
1944
1945                 if (si->bufct) {
1946                         LASSERT(shift < oa_bufs);
1947                         if (src_oa)
1948                                 memcpy(tmp_oa, src_oa, sizeof(*tmp_oa));
1949
1950                         tmp_oa->o_id = si->lsm.lsm_object_id;
1951                         rc = obd_brw(cmd, lov->tgts[si->ost_idx].ltd_exp,
1952                                      tmp_oa, &si->lsm, si->bufct,
1953                                      &ioarr[shift], oti);
1954                         if (rc)
1955                                 GOTO(out_oa, rc);
1956
1957                         lov_merge_attrs(ret_oa, tmp_oa, tmp_oa->o_valid, lsm,
1958                                         i, &set);
1959                 }
1960         }
1961
1962         ret_oa->o_id = src_oa->o_id;
1963         memcpy(src_oa, ret_oa, sizeof(*src_oa));
1964
1965         GOTO(out_oa, rc);
1966  out_oa:
1967         if (tmp_oa)
1968                 obdo_free(tmp_oa);
1969         if (ret_oa)
1970                 obdo_free(ret_oa);
1971  out_ioarr:
1972         OBD_FREE(ioarr, sizeof(*ioarr) * oa_bufs);
1973  out_where:
1974         OBD_FREE(where, sizeof(*where) * oa_bufs);
1975  out_sinfo:
1976         OBD_FREE(stripeinfo, stripe_count * sizeof(*stripeinfo));
1977         return rc;
1978 }
1979
1980 static int lov_brw_interpret(struct ptlrpc_request_set *reqset, void *data,
1981                              int rc)
1982 {
1983         struct lov_brw_async_args *aa = data;
1984         struct lov_stripe_md *lsm = aa->aa_lsm;
1985         obd_count             oa_bufs = aa->aa_oa_bufs;
1986         struct obdo          *oa = aa->aa_oa;
1987         struct obdo          *obdos = aa->aa_obdos;
1988         struct brw_page      *ioarr = aa->aa_ioarr;
1989         struct lov_oinfo     *loi;
1990         int i, set = 0;
1991         ENTRY;
1992
1993         if (rc == 0) {
1994                 /* NB all stripe requests succeeded to get here */
1995
1996                 for (i = 0, loi = lsm->lsm_oinfo; i < lsm->lsm_stripe_count;
1997                      i++, loi++) {
1998                         if (obdos[i].o_valid == 0)      /* inactive stripe */
1999                                 continue;
2000
2001                         lov_merge_attrs(oa, &obdos[i], obdos[i].o_valid, lsm,
2002                                         i, &set);
2003                 }
2004
2005                 if (!set) {
2006                         CERROR("No stripes had valid attrs\n");
2007                         rc = -EIO;
2008                 }
2009         }
2010         oa->o_id = lsm->lsm_object_id;
2011
2012         OBD_FREE(obdos, lsm->lsm_stripe_count * sizeof(*obdos));
2013         OBD_FREE(ioarr, sizeof(*ioarr) * oa_bufs);
2014         RETURN(rc);
2015 }
2016
2017 static int lov_brw_async(int cmd, struct obd_export *exp, struct obdo *oa,
2018                          struct lov_stripe_md *lsm, obd_count oa_bufs,
2019                          struct brw_page *pga, struct ptlrpc_request_set *set,
2020                          struct obd_trans_info *oti)
2021 {
2022         struct {
2023                 int bufct;
2024                 int index;
2025                 int subcount;
2026                 struct lov_stripe_md lsm;
2027                 int ost_idx;
2028         } *stripeinfo, *si, *si_last;
2029         struct lov_obd *lov;
2030         struct brw_page *ioarr;
2031         struct obdo *obdos = NULL;
2032         struct lov_oinfo *loi;
2033         struct lov_brw_async_args *aa;
2034         int rc = 0, i, *where, stripe_count = lsm->lsm_stripe_count;
2035         ENTRY;
2036
2037         if (lsm_bad_magic(lsm))
2038                 RETURN(-EINVAL);
2039
2040         lov = &exp->exp_obd->u.lov;
2041
2042         if (cmd == OBD_BRW_CHECK) {
2043                 rc = lov_brw_check(lov, oa, lsm, oa_bufs, pga);
2044                 RETURN(rc);
2045         }
2046
2047         OBD_ALLOC(stripeinfo, stripe_count * sizeof(*stripeinfo));
2048         if (!stripeinfo)
2049                 RETURN(-ENOMEM);
2050
2051         OBD_ALLOC(where, sizeof(*where) * oa_bufs);
2052         if (!where)
2053                 GOTO(out_sinfo, rc = -ENOMEM);
2054
2055         if (oa) {
2056                 OBD_ALLOC(obdos, sizeof(*obdos) * stripe_count);
2057                 if (!obdos)
2058                         GOTO(out_where, rc = -ENOMEM);
2059         }
2060
2061         OBD_ALLOC(ioarr, sizeof(*ioarr) * oa_bufs);
2062         if (!ioarr)
2063                 GOTO(out_obdos, rc = -ENOMEM);
2064
2065         for (i = 0; i < oa_bufs; i++) {
2066                 where[i] = lov_stripe_number(lsm, pga[i].disk_offset);
2067                 stripeinfo[where[i]].bufct++;
2068         }
2069
2070         for (i = 0, loi = lsm->lsm_oinfo, si_last = si = stripeinfo;
2071              i < stripe_count; i++, loi++, si_last = si, si++) {
2072                 if (i > 0)
2073                         si->index = si_last->index + si_last->bufct;
2074                 si->lsm.lsm_object_id = loi->loi_id;
2075                 si->ost_idx = loi->loi_ost_idx;
2076
2077                 if (oa) {
2078                         memcpy(&obdos[i], oa, sizeof(*obdos));
2079                         obdos[i].o_id = si->lsm.lsm_object_id;
2080                 }
2081         }
2082
2083         for (i = 0; i < oa_bufs; i++) {
2084                 int which = where[i];
2085                 int shift;
2086
2087                 shift = stripeinfo[which].index + stripeinfo[which].subcount;
2088                 LASSERT(shift < oa_bufs);
2089                 ioarr[shift] = pga[i];
2090                 lov_stripe_offset(lsm, pga[i].disk_offset, which,
2091                                   &ioarr[shift].disk_offset);
2092                 stripeinfo[which].subcount++;
2093         }
2094
2095         for (i = 0, si = stripeinfo; i < stripe_count; i++, si++) {
2096                 int shift = si->index;
2097
2098                 if (si->bufct == 0)
2099                         continue;
2100
2101                 if (lov->tgts[si->ost_idx].active == 0) {
2102                         CDEBUG(D_HA, "lov idx %d inactive\n", si->ost_idx);
2103                         GOTO(out_ioarr, rc = -EIO);
2104                 }
2105
2106                 LASSERT(shift < oa_bufs);
2107
2108                 rc = obd_brw_async(cmd, lov->tgts[si->ost_idx].ltd_exp,
2109                                    &obdos[i], &si->lsm, si->bufct,
2110                                    &ioarr[shift], set, oti);
2111                 if (rc)
2112                         GOTO(out_ioarr, rc);
2113         }
2114         LASSERT(rc == 0);
2115         LASSERT(set->set_interpret == NULL);
2116         set->set_interpret = (set_interpreter_func)lov_brw_interpret;
2117         LASSERT(sizeof(set->set_args) >= sizeof(struct lov_brw_async_args));
2118         aa = (struct lov_brw_async_args *)&set->set_args;
2119         aa->aa_lsm = lsm;
2120         aa->aa_obdos = obdos;
2121         aa->aa_oa = oa;
2122         aa->aa_ioarr = ioarr;
2123         aa->aa_oa_bufs = oa_bufs;
2124
2125         /* Don't free ioarr or obdos - that's done in lov_brw_interpret */
2126         GOTO(out_where, rc);
2127
2128  out_ioarr:
2129         OBD_FREE(ioarr, sizeof(*ioarr) * oa_bufs);
2130  out_obdos:
2131         OBD_FREE(obdos, stripe_count * sizeof(*obdos));
2132  out_where:
2133         OBD_FREE(where, sizeof(*where) * oa_bufs);
2134  out_sinfo:
2135         OBD_FREE(stripeinfo, stripe_count * sizeof(*stripeinfo));
2136         return rc;
2137 }
2138
2139 struct lov_async_page *lap_from_cookie(void *cookie)
2140 {
2141         struct lov_async_page *lap = cookie;
2142         if (lap->lap_magic != LAP_MAGIC)
2143                 return ERR_PTR(-EINVAL);
2144         return lap;
2145 };
2146
2147 static int lov_ap_make_ready(void *data, int cmd)
2148 {
2149         struct lov_async_page *lap = lap_from_cookie(data);
2150         /* XXX should these assert? */
2151         if (IS_ERR(lap))
2152                 return -EINVAL;
2153
2154         return lap->lap_caller_ops->ap_make_ready(lap->lap_caller_data, cmd);
2155 }
2156 static int lov_ap_refresh_count(void *data, int cmd)
2157 {
2158         struct lov_async_page *lap = lap_from_cookie(data);
2159         if (IS_ERR(lap))
2160                 return -EINVAL;
2161
2162         return lap->lap_caller_ops->ap_refresh_count(lap->lap_caller_data,
2163                                                      cmd);
2164 }
2165 static void lov_ap_fill_obdo(void *data, int cmd, struct obdo *oa)
2166 {
2167         struct lov_async_page *lap = lap_from_cookie(data);
2168         /* XXX should these assert? */
2169         if (IS_ERR(lap))
2170                 return;
2171
2172         lap->lap_caller_ops->ap_fill_obdo(lap->lap_caller_data, cmd, oa);
2173         /* XXX woah, shouldn't we be altering more here?  size? */
2174         oa->o_id = lap->lap_loi_id;
2175 }
2176
2177 static void lov_ap_completion(void *data, int cmd, struct obdo *oa, int rc)
2178 {
2179         struct lov_async_page *lap = lap_from_cookie(data);
2180         if (IS_ERR(lap))
2181                 return;
2182
2183         /* in a raid1 regime this would down a count of many ios
2184          * in flight, onl calling the caller_ops completion when all
2185          * the raid1 ios are complete */
2186         lap->lap_caller_ops->ap_completion(lap->lap_caller_data, cmd, oa, rc);
2187 }
2188
2189 static struct obd_async_page_ops lov_async_page_ops = {
2190         .ap_make_ready =        lov_ap_make_ready,
2191         .ap_refresh_count =     lov_ap_refresh_count,
2192         .ap_fill_obdo =         lov_ap_fill_obdo,
2193         .ap_completion =        lov_ap_completion,
2194 };
2195
2196 static int lov_prep_async_page(struct obd_export *exp,
2197                                struct lov_stripe_md *lsm,
2198                                struct lov_oinfo *loi, struct page *page,
2199                                obd_off offset, struct obd_async_page_ops *ops,
2200                                void *data, void **res)
2201 {
2202         struct lov_obd *lov = &exp->exp_obd->u.lov;
2203         struct lov_async_page *lap;
2204         int rc, stripe;
2205         ENTRY;
2206
2207         if (lsm_bad_magic(lsm))
2208                 RETURN(-EINVAL);
2209         LASSERT(loi == NULL);
2210
2211         stripe = lov_stripe_number(lsm, offset);
2212         loi = &lsm->lsm_oinfo[stripe];
2213
2214         if (obd_uuid_empty(&lov->tgts[loi->loi_ost_idx].uuid))
2215                 RETURN(-EIO);
2216         if (lov->tgts[loi->loi_ost_idx].active == 0)
2217                 RETURN(-EIO);
2218         if (lov->tgts[loi->loi_ost_idx].ltd_exp == NULL) {
2219                 CERROR("ltd_exp == NULL, but OST idx %d doesn't appear to be "
2220                        "deleted or inactive.\n", loi->loi_ost_idx);
2221                 RETURN(-EIO);
2222         }
2223
2224         OBD_ALLOC(lap, sizeof(*lap));
2225         if (lap == NULL)
2226                 RETURN(-ENOMEM);
2227
2228         lap->lap_magic = LAP_MAGIC;
2229         lap->lap_caller_ops = ops;
2230         lap->lap_caller_data = data;
2231
2232         /* FIXME handle multiple oscs after landing b_raid1 */
2233         lap->lap_stripe = stripe;
2234         switch (lsm->lsm_pattern) {
2235                 case LOV_PATTERN_RAID0:
2236                         lov_stripe_offset(lsm, offset, lap->lap_stripe,
2237                                           &lap->lap_sub_offset);
2238                         break;
2239                 case LOV_PATTERN_CMOBD:
2240                         lap->lap_sub_offset = offset;
2241                         break;
2242                 default:
2243                         LBUG();
2244         }
2245
2246         /* so the callback doesn't need the lsm */
2247         lap->lap_loi_id = loi->loi_id;
2248
2249         rc = obd_prep_async_page(lov->tgts[loi->loi_ost_idx].ltd_exp,
2250                                  lsm, loi, page, lap->lap_sub_offset,
2251                                  &lov_async_page_ops, lap,
2252                                  &lap->lap_sub_cookie);
2253         if (rc) {
2254                 OBD_FREE(lap, sizeof(*lap));
2255                 RETURN(rc);
2256         }
2257         CDEBUG(D_CACHE, "lap %p page %p cookie %p off "LPU64"\n", lap, page,
2258                lap->lap_sub_cookie, offset);
2259         *res = lap;
2260         RETURN(0);
2261 }
2262
2263 static int lov_queue_async_io(struct obd_export *exp,
2264                               struct lov_stripe_md *lsm,
2265                               struct lov_oinfo *loi, void *cookie,
2266                               int cmd, obd_off off, int count,
2267                               obd_flags brw_flags, obd_flags async_flags)
2268 {
2269         struct lov_obd *lov = &exp->exp_obd->u.lov;
2270         struct lov_async_page *lap;
2271         int rc;
2272
2273         LASSERT(loi == NULL);
2274
2275         if (lsm_bad_magic(lsm))
2276                 RETURN(-EINVAL);
2277
2278         lap = lap_from_cookie(cookie);
2279         if (IS_ERR(lap))
2280                 RETURN(PTR_ERR(lap));
2281
2282         loi = &lsm->lsm_oinfo[lap->lap_stripe];
2283
2284         rc = obd_queue_async_io(lov->tgts[loi->loi_ost_idx].ltd_exp, lsm,
2285                                 loi, lap->lap_sub_cookie, cmd, off, count,
2286                                 brw_flags, async_flags);
2287         RETURN(rc);
2288 }
2289
2290 static int lov_set_async_flags(struct obd_export *exp,
2291                                struct lov_stripe_md *lsm,
2292                                struct lov_oinfo *loi, void *cookie,
2293                                obd_flags async_flags)
2294 {
2295         struct lov_obd *lov = &exp->exp_obd->u.lov;
2296         struct lov_async_page *lap;
2297         int rc;
2298
2299         LASSERT(loi == NULL);
2300
2301         if (lsm_bad_magic(lsm))
2302                 RETURN(-EINVAL);
2303
2304         lap = lap_from_cookie(cookie);
2305         if (IS_ERR(lap))
2306                 RETURN(PTR_ERR(lap));
2307
2308         loi = &lsm->lsm_oinfo[lap->lap_stripe];
2309
2310         rc = obd_set_async_flags(lov->tgts[loi->loi_ost_idx].ltd_exp,
2311                                  lsm, loi, lap->lap_sub_cookie, async_flags);
2312         RETURN(rc);
2313 }
2314
2315 static int lov_queue_group_io(struct obd_export *exp,
2316                               struct lov_stripe_md *lsm,
2317                               struct lov_oinfo *loi,
2318                               struct obd_io_group *oig, void *cookie,
2319                               int cmd, obd_off off, int count,
2320                               obd_flags brw_flags, obd_flags async_flags)
2321 {
2322         struct lov_obd *lov = &exp->exp_obd->u.lov;
2323         struct lov_async_page *lap;
2324         int rc;
2325
2326         LASSERT(loi == NULL);
2327
2328         if (lsm_bad_magic(lsm))
2329                 RETURN(-EINVAL);
2330
2331         lap = lap_from_cookie(cookie);
2332         if (IS_ERR(lap))
2333                 RETURN(PTR_ERR(lap));
2334
2335         loi = &lsm->lsm_oinfo[lap->lap_stripe];
2336
2337         rc = obd_queue_group_io(lov->tgts[loi->loi_ost_idx].ltd_exp, lsm, loi,
2338                                 oig, lap->lap_sub_cookie, cmd, off, count,
2339                                 brw_flags, async_flags);
2340         RETURN(rc);
2341 }
2342
2343 /* this isn't exactly optimal.  we may have queued sync io in oscs on
2344  * all stripes, but we don't record that fact at queue time.  so we
2345  * trigger sync io on all stripes. */
2346 static int lov_trigger_group_io(struct obd_export *exp,
2347                                 struct lov_stripe_md *lsm,
2348                                 struct lov_oinfo *loi,
2349                                 struct obd_io_group *oig)
2350 {
2351         struct lov_obd *lov = &exp->exp_obd->u.lov;
2352         int rc = 0, i, err;
2353
2354         LASSERT(loi == NULL);
2355
2356         if (lsm_bad_magic(lsm))
2357                 RETURN(-EINVAL);
2358
2359         loi = lsm->lsm_oinfo;
2360         for (i = 0; i < lsm->lsm_stripe_count; i++, loi++) {
2361                 if (lov->tgts[loi->loi_ost_idx].active == 0) {
2362                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
2363                         continue;
2364                 }
2365
2366                 err = obd_trigger_group_io(lov->tgts[loi->loi_ost_idx].ltd_exp,
2367                                            lsm, loi, oig);
2368                 if (rc == 0 && err != 0)
2369                         rc = err;
2370         };
2371         RETURN(rc);
2372 }
2373
2374 static int lov_teardown_async_page(struct obd_export *exp,
2375                                    struct lov_stripe_md *lsm,
2376                                    struct lov_oinfo *loi, void *cookie)
2377 {
2378         struct lov_obd *lov = &exp->exp_obd->u.lov;
2379         struct lov_async_page *lap;
2380         int rc;
2381
2382         LASSERT(loi == NULL);
2383
2384         if (lsm_bad_magic(lsm))
2385                 RETURN(-EINVAL);
2386
2387         lap = lap_from_cookie(cookie);
2388         if (IS_ERR(lap))
2389                 RETURN(PTR_ERR(lap));
2390
2391         loi = &lsm->lsm_oinfo[lap->lap_stripe];
2392
2393         rc = obd_teardown_async_page(lov->tgts[loi->loi_ost_idx].ltd_exp,
2394                                      lsm, loi, lap->lap_sub_cookie);
2395         if (rc) {
2396                 CERROR("unable to teardown sub cookie %p: %d\n",
2397                        lap->lap_sub_cookie, rc);
2398                 RETURN(rc);
2399         }
2400         OBD_FREE(lap, sizeof(*lap));
2401         RETURN(rc);
2402 }
2403
2404 static int lov_enqueue(struct obd_export *exp, struct lov_stripe_md *lsm,
2405                        __u32 type, ldlm_policy_data_t *policy, __u32 mode,
2406                        int *flags, void *bl_cb, void *cp_cb, void *gl_cb,
2407                        void *data,__u32 lvb_len, void *lvb_swabber,
2408                        struct lustre_handle *lockh)
2409 {
2410         struct lov_lock_handles *lov_lockh = NULL;
2411         struct lustre_handle *lov_lockhp;
2412         struct lov_obd *lov;
2413         struct lov_oinfo *loi;
2414         char submd_buf[sizeof(struct lov_stripe_md) + sizeof(struct lov_oinfo)];
2415         struct lov_stripe_md *submd = (void *)submd_buf;
2416         ldlm_error_t rc;
2417         int i, save_flags = *flags;
2418         ENTRY;
2419
2420         if (lsm_bad_magic(lsm))
2421                 RETURN(-EINVAL);
2422
2423         /* we should never be asked to replay a lock this way. */
2424         LASSERT((*flags & LDLM_FL_REPLAY) == 0);
2425
2426         if (!exp || !exp->exp_obd)
2427                 RETURN(-ENODEV);
2428
2429         if (lsm->lsm_stripe_count > 1) {
2430                 lov_lockh = lov_llh_new(lsm);
2431                 if (lov_lockh == NULL)
2432                         RETURN(-ENOMEM);
2433
2434                 lockh->cookie = lov_lockh->llh_handle.h_cookie;
2435                 lov_lockhp = lov_lockh->llh_handles;
2436         } else {
2437                 lov_lockhp = lockh;
2438         }
2439
2440         lov = &exp->exp_obd->u.lov;
2441         for (i = 0, loi = lsm->lsm_oinfo; i < lsm->lsm_stripe_count;
2442              i++, loi++, lov_lockhp++) {
2443                 ldlm_policy_data_t sub_ext;
2444                 obd_off start, end;
2445
2446                 if (!lov_stripe_intersects(lsm, i, policy->l_extent.start,
2447                                            policy->l_extent.end, &start,
2448                                            &end))
2449                         continue;
2450
2451                 sub_ext.l_extent.start = start;
2452                 sub_ext.l_extent.end = end;
2453                 sub_ext.l_extent.gid = policy->l_extent.gid;
2454
2455                 if (lov->tgts[loi->loi_ost_idx].active == 0) {
2456                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
2457                         continue;
2458                 }
2459
2460                 /* XXX LOV STACKING: submd should be from the subobj */
2461                 submd->lsm_object_id = loi->loi_id;
2462                 submd->lsm_object_gr = lsm->lsm_object_gr;
2463                 submd->lsm_stripe_count = 0;
2464                 submd->lsm_oinfo->loi_kms_valid = loi->loi_kms_valid;
2465                 submd->lsm_oinfo->loi_rss = loi->loi_rss;
2466                 submd->lsm_oinfo->loi_kms = loi->loi_kms;
2467                 submd->lsm_oinfo->loi_blocks = loi->loi_blocks;
2468                 loi->loi_mtime = submd->lsm_oinfo->loi_mtime;
2469                 /* XXX submd is not fully initialized here */
2470                 *flags = save_flags;
2471                 rc = obd_enqueue(lov->tgts[loi->loi_ost_idx].ltd_exp, submd,
2472                                  type, &sub_ext, mode, flags, bl_cb, cp_cb,
2473                                  gl_cb, data, lvb_len, lvb_swabber, lov_lockhp);
2474
2475                 /* XXX FIXME: This unpleasantness doesn't belong here at *all*.
2476                  * It belongs in the OSC, except that the OSC doesn't have
2477                  * access to the real LOI -- it gets a copy, that we created
2478                  * above, and that copy can be arbitrarily out of date.
2479                  *
2480                  * The LOV API is due for a serious rewriting anyways, and this
2481                  * can be addressed then. */
2482                 if (rc == ELDLM_OK) {
2483                         struct ldlm_lock *lock = ldlm_handle2lock(lov_lockhp);
2484                         __u64 tmp = submd->lsm_oinfo->loi_rss;
2485
2486                         LASSERT(lock != NULL);
2487                         loi->loi_rss = tmp;
2488                         loi->loi_blocks = submd->lsm_oinfo->loi_blocks;
2489                         /* Extend KMS up to the end of this lock and no further
2490                          * A lock on [x,y] means a KMS of up to y + 1 bytes! */
2491                         if (tmp > lock->l_policy_data.l_extent.end)
2492                                 tmp = lock->l_policy_data.l_extent.end + 1;
2493                         if (tmp >= loi->loi_kms) {
2494                                 CDEBUG(D_INODE, "lock acquired, setting rss="
2495                                        LPU64", kms="LPU64"\n", loi->loi_rss,
2496                                        tmp);
2497                                 loi->loi_kms = tmp;
2498                                 loi->loi_kms_valid = 1;
2499                         } else {
2500                                 CDEBUG(D_INODE, "lock acquired, setting rss="
2501                                        LPU64"; leaving kms="LPU64", end="LPU64
2502                                        "\n", loi->loi_rss, loi->loi_kms,
2503                                        lock->l_policy_data.l_extent.end);
2504                         }
2505                         ldlm_lock_allow_match(lock);
2506                         LDLM_LOCK_PUT(lock);
2507                 } else if (rc == ELDLM_LOCK_ABORTED &&
2508                            save_flags & LDLM_FL_HAS_INTENT) {
2509                         memset(lov_lockhp, 0, sizeof(*lov_lockhp));
2510                         loi->loi_rss = submd->lsm_oinfo->loi_rss;
2511                         loi->loi_blocks = submd->lsm_oinfo->loi_blocks;
2512                         CDEBUG(D_INODE, "glimpsed, setting rss="LPU64"; leaving"
2513                                " kms="LPU64"\n", loi->loi_rss, loi->loi_kms);
2514                 } else {
2515                         memset(lov_lockhp, 0, sizeof(*lov_lockhp));
2516                         if (lov->tgts[loi->loi_ost_idx].active) {
2517                                 CERROR("error: enqueue objid "LPX64" subobj "
2518                                        LPX64" on OST idx %d: rc = %d\n",
2519                                        lsm->lsm_object_id, loi->loi_id,
2520                                        loi->loi_ost_idx, rc);
2521                                 GOTO(out_locks, rc);
2522                         }
2523                 }
2524         }
2525         if (lsm->lsm_stripe_count > 1)
2526                 lov_llh_put(lov_lockh);
2527         RETURN(ELDLM_OK);
2528
2529  out_locks:
2530         while (loi--, lov_lockhp--, i-- > 0) {
2531                 struct lov_stripe_md submd;
2532                 int err;
2533
2534                 if (lov_lockhp->cookie == 0)
2535                         continue;
2536
2537                 /* XXX LOV STACKING: submd should be from the subobj */
2538                 submd.lsm_object_id = loi->loi_id;
2539                 submd.lsm_object_gr = lsm->lsm_object_gr;
2540                 submd.lsm_stripe_count = 0;
2541                 err = obd_cancel(lov->tgts[loi->loi_ost_idx].ltd_exp, &submd,
2542                                  mode, lov_lockhp);
2543                 if (err && lov->tgts[loi->loi_ost_idx].active) {
2544                         CERROR("error: cancelling objid "LPX64" on OST "
2545                                "idx %d after enqueue error: rc = %d\n",
2546                                loi->loi_id, loi->loi_ost_idx, err);
2547                 }
2548         }
2549
2550         if (lsm->lsm_stripe_count > 1) {
2551                 lov_llh_destroy(lov_lockh);
2552                 lov_llh_put(lov_lockh);
2553         }
2554         return rc;
2555 }
2556
2557 static int lov_match(struct obd_export *exp, struct lov_stripe_md *lsm,
2558                      __u32 type, ldlm_policy_data_t *policy, __u32 mode,
2559                      int *flags, void *data, struct lustre_handle *lockh)
2560 {
2561         struct lov_lock_handles *lov_lockh = NULL;
2562         struct lustre_handle *lov_lockhp;
2563         struct lov_obd *lov;
2564         struct lov_oinfo *loi;
2565         struct lov_stripe_md submd;
2566         ldlm_error_t rc = 0;
2567         int i;
2568         ENTRY;
2569
2570         if (lsm_bad_magic(lsm))
2571                 RETURN(-EINVAL);
2572
2573         if (!exp || !exp->exp_obd)
2574                 RETURN(-ENODEV);
2575
2576         if (lsm->lsm_stripe_count > 1) {
2577                 lov_lockh = lov_llh_new(lsm);
2578                 if (lov_lockh == NULL)
2579                         RETURN(-ENOMEM);
2580
2581                 lockh->cookie = lov_lockh->llh_handle.h_cookie;
2582                 lov_lockhp = lov_lockh->llh_handles;
2583         } else {
2584                 lov_lockhp = lockh;
2585         }
2586
2587         lov = &exp->exp_obd->u.lov;
2588         for (i = 0, loi = lsm->lsm_oinfo; i < lsm->lsm_stripe_count;
2589              i++, loi++, lov_lockhp++) {
2590                 ldlm_policy_data_t sub_ext;
2591                 obd_off start, end;
2592                 int lov_flags;
2593
2594                 if (!lov_stripe_intersects(lsm, i, policy->l_extent.start,
2595                                            policy->l_extent.end, &start, &end))
2596                         continue;
2597
2598                 sub_ext.l_extent.start = start;
2599                 sub_ext.l_extent.end = end;
2600
2601                 if (obd_uuid_empty(&lov->tgts[loi->loi_ost_idx].uuid)) {
2602                         CDEBUG(D_HA, "lov idx %d deleted\n", loi->loi_ost_idx);
2603                         continue;
2604                 }
2605                 if (lov->tgts[loi->loi_ost_idx].active == 0) {
2606                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
2607                         rc = -EIO;
2608                         break;
2609                 }
2610
2611                 /* XXX LOV STACKING: submd should be from the subobj */
2612                 submd.lsm_object_id = loi->loi_id;
2613                 submd.lsm_object_gr = lsm->lsm_object_gr;
2614                 submd.lsm_stripe_count = 0;
2615                 lov_flags = *flags;
2616                 /* XXX submd is not fully initialized here */
2617                 rc = obd_match(lov->tgts[loi->loi_ost_idx].ltd_exp, &submd,
2618                                type, &sub_ext, mode, &lov_flags, data,
2619                                lov_lockhp);
2620                 if (rc != 1)
2621                         break;
2622         }
2623         if (rc == 1) {
2624                 if (lsm->lsm_stripe_count > 1) {
2625                         if (*flags & LDLM_FL_TEST_LOCK)
2626                                 lov_llh_destroy(lov_lockh);
2627                         lov_llh_put(lov_lockh);
2628                 }
2629                 RETURN(1);
2630         }
2631
2632         while (loi--, lov_lockhp--, i-- > 0) {
2633                 struct lov_stripe_md submd;
2634                 int err;
2635
2636                 if (lov_lockhp->cookie == 0)
2637                         continue;
2638
2639                 /* XXX LOV STACKING: submd should be from the subobj */
2640                 submd.lsm_object_id = loi->loi_id;
2641                 submd.lsm_object_gr = lsm->lsm_object_gr;
2642                 submd.lsm_stripe_count = 0;
2643                 err = obd_cancel(lov->tgts[loi->loi_ost_idx].ltd_exp, &submd,
2644                                  mode, lov_lockhp);
2645                 if (err && lov->tgts[loi->loi_ost_idx].active) {
2646                         CERROR("error: cancelling objid "LPX64" on OST "
2647                                "idx %d after match failure: rc = %d\n",
2648                                loi->loi_id, loi->loi_ost_idx, err);
2649                 }
2650         }
2651
2652         if (lsm->lsm_stripe_count > 1) {
2653                 lov_llh_destroy(lov_lockh);
2654                 lov_llh_put(lov_lockh);
2655         }
2656         RETURN(rc);
2657 }
2658
2659 static int lov_change_cbdata(struct obd_export *exp,
2660                              struct lov_stripe_md *lsm, ldlm_iterator_t it,
2661                              void *data)
2662 {
2663         struct lov_obd *lov;
2664         struct lov_oinfo *loi;
2665         int rc = 0, i;
2666         ENTRY;
2667
2668         if (lsm_bad_magic(lsm))
2669                 RETURN(-EINVAL);
2670
2671         if (!exp || !exp->exp_obd)
2672                 RETURN(-ENODEV);
2673
2674         LASSERT(lsm->lsm_object_gr > 0);
2675
2676         lov = &exp->exp_obd->u.lov;
2677         for (i = 0,loi = lsm->lsm_oinfo; i < lsm->lsm_stripe_count; i++,loi++) {
2678                 struct lov_stripe_md submd;
2679                 if (lov->tgts[loi->loi_ost_idx].active == 0) {
2680                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
2681                         continue;
2682                 }
2683
2684                 submd.lsm_object_id = loi->loi_id;
2685                 submd.lsm_object_gr = lsm->lsm_object_gr;
2686                 submd.lsm_stripe_count = 0;
2687                 rc = obd_change_cbdata(lov->tgts[loi->loi_ost_idx].ltd_exp,
2688                                        &submd, it, data);
2689         }
2690         RETURN(rc);
2691 }
2692
2693 static int lov_cancel(struct obd_export *exp, struct lov_stripe_md *lsm,
2694                       __u32 mode, struct lustre_handle *lockh)
2695 {
2696         struct lov_lock_handles *lov_lockh = NULL;
2697         struct lustre_handle *lov_lockhp;
2698         struct lov_obd *lov;
2699         struct lov_oinfo *loi;
2700         int rc = 0, i;
2701         ENTRY;
2702
2703         if (lsm_bad_magic(lsm))
2704                 RETURN(-EINVAL);
2705
2706         if (!exp || !exp->exp_obd)
2707                 RETURN(-ENODEV);
2708
2709         LASSERT(lsm->lsm_object_gr > 0);
2710
2711         LASSERT(lockh);
2712         if (lsm->lsm_stripe_count > 1) {
2713                 lov_lockh = lov_handle2llh(lockh);
2714                 if (!lov_lockh) {
2715                         CERROR("LOV: invalid lov lock handle %p\n", lockh);
2716                         RETURN(-EINVAL);
2717                 }
2718
2719                 lov_lockhp = lov_lockh->llh_handles;
2720         } else {
2721                 lov_lockhp = lockh;
2722         }
2723
2724         lov = &exp->exp_obd->u.lov;
2725         for (i = 0, loi = lsm->lsm_oinfo; i < lsm->lsm_stripe_count;
2726              i++, loi++, lov_lockhp++) {
2727                 struct lov_stripe_md submd;
2728                 int err;
2729
2730                 if (lov_lockhp->cookie == 0) {
2731                         CDEBUG(D_HA, "lov idx %d subobj "LPX64" no lock?\n",
2732                                loi->loi_ost_idx, loi->loi_id);
2733                         continue;
2734                 }
2735
2736                 /* XXX LOV STACKING: submd should be from the subobj */
2737                 submd.lsm_object_id = loi->loi_id;
2738                 submd.lsm_object_gr = lsm->lsm_object_gr;
2739                 submd.lsm_stripe_count = 0;
2740                 err = obd_cancel(lov->tgts[loi->loi_ost_idx].ltd_exp, &submd,
2741                                  mode, lov_lockhp);
2742                 if (err) {
2743                         if (lov->tgts[loi->loi_ost_idx].active) {
2744                                 CERROR("error: cancel objid "LPX64" subobj "
2745                                        LPX64" on OST idx %d: rc = %d\n",
2746                                        lsm->lsm_object_id,
2747                                        loi->loi_id, loi->loi_ost_idx, err);
2748                                 if (!rc)
2749                                         rc = err;
2750                         }
2751                 }
2752         }
2753
2754         if (lsm->lsm_stripe_count > 1)
2755                 lov_llh_destroy(lov_lockh);
2756         if (lov_lockh != NULL)
2757                 lov_llh_put(lov_lockh);
2758         RETURN(rc);
2759 }
2760
2761 static int lov_cancel_unused(struct obd_export *exp,
2762                              struct lov_stripe_md *lsm, int flags, void *opaque)
2763 {
2764         struct lov_obd *lov;
2765         struct lov_oinfo *loi;
2766         int rc = 0, i;
2767         ENTRY;
2768
2769         lov = &exp->exp_obd->u.lov;
2770         if (lsm == NULL) {
2771                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
2772                         int err = obd_cancel_unused(lov->tgts[i].ltd_exp, NULL,
2773                                                     flags, opaque);
2774                         if (!rc)
2775                                 rc = err;
2776                 }
2777                 RETURN(rc);
2778         }
2779
2780         if (lsm_bad_magic(lsm))
2781                 RETURN(-EINVAL);
2782
2783         if (!exp || !exp->exp_obd)
2784                 RETURN(-ENODEV);
2785
2786         LASSERT(lsm->lsm_object_gr > 0);
2787
2788         for (i = 0,loi = lsm->lsm_oinfo; i < lsm->lsm_stripe_count; i++,loi++) {
2789                 struct lov_stripe_md submd;
2790                 int err;
2791
2792                 if (lov->tgts[loi->loi_ost_idx].active == 0)
2793                         CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
2794
2795                 submd.lsm_object_id = loi->loi_id;
2796                 submd.lsm_object_gr = lsm->lsm_object_gr;
2797                 submd.lsm_stripe_count = 0;
2798                 err = obd_cancel_unused(lov->tgts[loi->loi_ost_idx].ltd_exp,
2799                                         &submd, flags, opaque);
2800                 if (err && lov->tgts[loi->loi_ost_idx].active) {
2801                         CERROR("error: cancel unused objid "LPX64" subobj "LPX64
2802                                " on OST idx %d: rc = %d\n", lsm->lsm_object_id,
2803                                loi->loi_id, loi->loi_ost_idx, err);
2804                         if (!rc)
2805                                 rc = err;
2806                 }
2807         }
2808         RETURN(rc);
2809 }
2810
2811 #define LOV_U64_MAX ((__u64)~0ULL)
2812 #define LOV_SUM_MAX(tot, add)                                           \
2813         do {                                                            \
2814                 if ((tot) + (add) < (tot))                              \
2815                         (tot) = LOV_U64_MAX;                            \
2816                 else                                                    \
2817                         (tot) += (add);                                 \
2818         } while(0)
2819
2820 static int lov_statfs(struct obd_device *obd, struct obd_statfs *osfs,
2821                       unsigned long max_age)
2822 {
2823         struct lov_obd *lov = &obd->u.lov;
2824         struct obd_statfs lov_sfs;
2825         int set = 0;
2826         int rc = 0;
2827         int i;
2828         ENTRY;
2829
2830
2831         /* We only get block data from the OBD */
2832         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
2833                 int err;
2834                 if (!lov->tgts[i].active) {
2835                         CDEBUG(D_HA, "lov idx %d inactive\n", i);
2836                         continue;
2837                 }
2838
2839                 err = obd_statfs(class_exp2obd(lov->tgts[i].ltd_exp), &lov_sfs,
2840                                  max_age);
2841                 if (err) {
2842                         if (lov->tgts[i].active && !rc)
2843                                 rc = err;
2844                         continue;
2845                 }
2846
2847                 if (!set) {
2848                         memcpy(osfs, &lov_sfs, sizeof(lov_sfs));
2849                         set = 1;
2850                 } else {
2851                         osfs->os_bfree += lov_sfs.os_bfree;
2852                         osfs->os_bavail += lov_sfs.os_bavail;
2853                         osfs->os_blocks += lov_sfs.os_blocks;
2854                         /* XXX not sure about this one - depends on policy.
2855                          *   - could be minimum if we always stripe on all OBDs
2856                          *     (but that would be wrong for any other policy,
2857                          *     if one of the OBDs has no more objects left)
2858                          *   - could be sum if we stripe whole objects
2859                          *   - could be average, just to give a nice number
2860                          *
2861                          * To give a "reasonable" (if not wholly accurate)
2862                          * number, we divide the total number of free objects
2863                          * by expected stripe count (watch out for overflow).
2864                          */
2865                         LOV_SUM_MAX(osfs->os_files, lov_sfs.os_files);
2866                         LOV_SUM_MAX(osfs->os_ffree, lov_sfs.os_ffree);
2867                 }
2868         }
2869
2870         if (set) {
2871                 __u32 expected_stripes = lov->desc.ld_default_stripe_count ?
2872                                          lov->desc.ld_default_stripe_count :
2873                                          lov->desc.ld_active_tgt_count;
2874
2875                 if (osfs->os_files != LOV_U64_MAX)
2876                         do_div(osfs->os_files, expected_stripes);
2877                 if (osfs->os_ffree != LOV_U64_MAX)
2878                         do_div(osfs->os_ffree, expected_stripes);
2879         } else if (!rc)
2880                 rc = -EIO;
2881
2882         RETURN(rc);
2883 }
2884
2885 static int lov_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
2886                          void *karg, void *uarg)
2887 {
2888         struct obd_device *obddev = class_exp2obd(exp);
2889         struct lov_obd *lov = &obddev->u.lov;
2890         int i, rc, count = lov->desc.ld_tgt_count;
2891         struct obd_uuid *uuidp;
2892         ENTRY;
2893
2894         switch (cmd) {
2895         case OBD_IOC_LOV_GET_CONFIG: {
2896                 struct obd_ioctl_data *data = karg;
2897                 struct lov_tgt_desc *tgtdesc;
2898                 struct lov_desc *desc;
2899                 char *buf = NULL;
2900                 __u32 *genp;
2901
2902                 buf = NULL;
2903                 len = 0;
2904                 if (obd_ioctl_getdata(&buf, &len, (void *)uarg))
2905                         RETURN(-EINVAL);
2906
2907                 data = (struct obd_ioctl_data *)buf;
2908
2909                 if (sizeof(*desc) > data->ioc_inllen1) {
2910                         obd_ioctl_freedata(buf, len);
2911                         RETURN(-EINVAL);
2912                 }
2913
2914                 if (sizeof(uuidp->uuid) * count > data->ioc_inllen2) {
2915                         obd_ioctl_freedata(buf, len);
2916                         RETURN(-EINVAL);
2917                 }
2918
2919                 if (sizeof(__u32) * count > data->ioc_inllen3) {
2920                         obd_ioctl_freedata(buf, len);
2921                         RETURN(-EINVAL);
2922                 }
2923
2924                 desc = (struct lov_desc *)data->ioc_inlbuf1;
2925                 memcpy(desc, &(lov->desc), sizeof(*desc));
2926
2927                 uuidp = (struct obd_uuid *)data->ioc_inlbuf2;
2928                 genp = (__u32 *)data->ioc_inlbuf3;
2929                 tgtdesc = lov->tgts;
2930                 /* the uuid will be empty for deleted OSTs */
2931                 for (i = 0; i < count; i++, uuidp++, genp++, tgtdesc++) {
2932                         obd_str2uuid(uuidp, tgtdesc->uuid.uuid);
2933                         *genp = tgtdesc->ltd_gen;
2934                 }
2935
2936                 rc = copy_to_user((void *)uarg, buf, len);
2937                 if (rc)
2938                         rc = -EFAULT;
2939                 obd_ioctl_freedata(buf, len);
2940                 break;
2941         }
2942         case LL_IOC_LOV_SETSTRIPE:
2943                 rc = lov_setstripe(exp, karg, uarg);
2944                 break;
2945         case LL_IOC_LOV_GETSTRIPE:
2946                 rc = lov_getstripe(exp, karg, uarg);
2947                 break;
2948         case LL_IOC_LOV_SETEA:
2949                 rc = lov_setea(exp, karg, uarg);
2950                 break;
2951         default: {
2952                 int set = 0;
2953                 if (count == 0)
2954                         RETURN(-ENOTTY);
2955                 rc = 0;
2956                 for (i = 0; i < count; i++) {
2957                         int err;
2958
2959                         /* OST was deleted */
2960                         if (obd_uuid_empty(&lov->tgts[i].uuid))
2961                                 continue;
2962
2963                         err = obd_iocontrol(cmd, lov->tgts[i].ltd_exp,
2964                                             len, karg, uarg);
2965                         if (err) {
2966                                 if (lov->tgts[i].active) {
2967                                         CERROR("error: iocontrol OSC %s on OST"
2968                                                "idx %d: cmd %x err = %d\n",
2969                                                lov->tgts[i].uuid.uuid, i,
2970                                                cmd, err);
2971                                         if (!rc)
2972                                                 rc = err;
2973                                 }
2974                         } else
2975                                 set = 1;
2976                 }
2977                 if (!set && !rc)
2978                         rc = -EIO;
2979         }
2980         }
2981
2982         RETURN(rc);
2983 }
2984
2985 static int lov_get_info(struct obd_export *exp, __u32 keylen,
2986                         void *key, __u32 *vallen, void *val)
2987 {
2988         struct obd_device *obddev = class_exp2obd(exp);
2989         struct lov_obd *lov = &obddev->u.lov;
2990         int i;
2991         ENTRY;
2992
2993         if (!vallen || !val)
2994                 RETURN(-EFAULT);
2995
2996         if (keylen > strlen("lock_to_stripe") &&
2997             strcmp(key, "lock_to_stripe") == 0) {
2998                 struct {
2999                         char name[16];
3000                         struct ldlm_lock *lock;
3001                         struct lov_stripe_md *lsm;
3002                 } *data = key;
3003                 struct lov_oinfo *loi;
3004                 struct ldlm_res_id *res_id = &data->lock->l_resource->lr_name;
3005                 __u32 *stripe = val;
3006
3007                 if (*vallen < sizeof(*stripe))
3008                         RETURN(-EFAULT);
3009                 *vallen = sizeof(*stripe);
3010
3011                 /* XXX This is another one of those bits that will need to
3012                  * change if we ever actually support nested LOVs.  It uses
3013                  * the lock's export to find out which stripe it is. */
3014                 /* XXX - it's assumed all the locks for deleted OSTs have
3015                  * been cancelled. Also, the export for deleted OSTs will
3016                  * be NULL and won't match the lock's export. */
3017                 for (i = 0, loi = data->lsm->lsm_oinfo;
3018                      i < data->lsm->lsm_stripe_count;
3019                      i++, loi++) {
3020                         if (lov->tgts[loi->loi_ost_idx].ltd_exp ==
3021                                         data->lock->l_conn_export &&
3022                             loi->loi_id == res_id->name[0] &&
3023                             loi->loi_gr == res_id->name[2]) {
3024                                 *stripe = i;
3025                                 RETURN(0);
3026                         }
3027                 }
3028                 LDLM_ERROR(data->lock, "lock on inode without such object\n");
3029                 dump_lsm(D_ERROR, data->lsm);
3030                 RETURN(-ENXIO);
3031         } else if (keylen >= strlen("size_to_stripe") &&
3032                    strcmp(key, "size_to_stripe") == 0) {
3033                 struct {
3034                         int stripe_number;
3035                         __u64 size;
3036                         struct lov_stripe_md *lsm;
3037                 } *data = val;
3038
3039                 if (*vallen < sizeof(*data))
3040                         RETURN(-EFAULT);
3041
3042                 data->size = lov_size_to_stripe(data->lsm, data->size,
3043                                                 data->stripe_number);
3044                 RETURN(0);
3045         } else if (keylen >= strlen("last_id") && strcmp(key, "last_id") == 0) {
3046                 obd_id *ids = val;
3047                 int rc, size = sizeof(obd_id);
3048                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
3049                         if (!lov->tgts[i].active)
3050                                 continue;
3051                         rc = obd_get_info(lov->tgts[i].ltd_exp, keylen, key,
3052                                           &size, &(ids[i]));
3053                         if (rc != 0)
3054                                 RETURN(rc);
3055                 }
3056                 RETURN(0);
3057         } else if (keylen >= strlen("lovdesc") && strcmp(key, "lovdesc") == 0) {
3058                 struct lov_desc *desc_ret = val;
3059                 *desc_ret = lov->desc;
3060
3061                 RETURN(0);
3062         }
3063
3064         RETURN(-EINVAL);
3065 }
3066
3067 static int lov_set_info(struct obd_export *exp, obd_count keylen,
3068                         void *key, obd_count vallen, void *val)
3069 {
3070         struct obd_device *obddev = class_exp2obd(exp);
3071         struct lov_obd *lov = &obddev->u.lov;
3072         int i, rc = 0;
3073         ENTRY;
3074
3075 #define KEY_IS(str) \
3076         (keylen == strlen(str) && memcmp(key, str, keylen) == 0)
3077
3078         if (KEY_IS("next_id")) {
3079                 if (vallen != lov->desc.ld_tgt_count)
3080                         RETURN(-EINVAL);
3081                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
3082                         int er;
3083
3084                         /* OST was deleted */
3085                         if (obd_uuid_empty(&lov->tgts[i].uuid))
3086                                 continue;
3087
3088                         /* initialize all OSCs, even inactive ones */
3089
3090                         er = obd_set_info(lov->tgts[i].ltd_exp, keylen, key,
3091                                           sizeof(obd_id), ((obd_id*)val) + i);
3092                         if (!rc)
3093                                 rc = er;
3094                 }
3095                 RETURN(rc);
3096         }
3097         if (KEY_IS("growth_count")) {
3098                 if (vallen != sizeof(int))
3099                         RETURN(-EINVAL);
3100         } else if (KEY_IS("mds_conn")) {
3101                 if (vallen != sizeof(__u32))
3102                         RETURN(-EINVAL);
3103         } else if (KEY_IS("unlinked") || KEY_IS("unrecovery")) {
3104                 if (vallen != 0)
3105                         RETURN(-EINVAL);
3106         } else {
3107                 RETURN(-EINVAL);
3108         }
3109
3110         for (i = 0; i < lov->desc.ld_tgt_count; i++) {
3111                 int er;
3112
3113                 /* OST was deleted */
3114                 if (obd_uuid_empty(&lov->tgts[i].uuid))
3115                         continue;
3116
3117                 if (!val && !lov->tgts[i].active)
3118                         continue;
3119
3120                 er = obd_set_info(lov->tgts[i].ltd_exp, keylen, key, vallen,
3121                                   val);
3122                 if (!rc)
3123                         rc = er;
3124         }
3125         RETURN(rc);
3126 #undef KEY_IS
3127
3128 }
3129
3130 /* Merge rss if @kms_only == 0
3131  *
3132  * Even when merging RSS, we will take the KMS value if it's larger.
3133  * This prevents getattr from stomping on dirty cached pages which
3134  * extend the file size. */
3135 __u64 lov_merge_size(struct lov_stripe_md *lsm, int kms_only)
3136 {
3137         struct lov_oinfo *loi;
3138         __u64 size = 0;
3139         int i;
3140
3141         for (i = 0, loi = lsm->lsm_oinfo; i < lsm->lsm_stripe_count;
3142              i++, loi++) {
3143                 obd_size lov_size, tmpsize;
3144
3145                 tmpsize = loi->loi_kms;
3146                 if (kms_only == 0 && loi->loi_rss > tmpsize)
3147                         tmpsize = loi->loi_rss;
3148
3149                 lov_size = lov_stripe_size(lsm, tmpsize, i);
3150                 if (lov_size > size)
3151                         size = lov_size;
3152         }
3153
3154         return size;
3155 }
3156 EXPORT_SYMBOL(lov_merge_size);
3157
3158 /* Merge blocks */
3159 __u64 lov_merge_blocks(struct lov_stripe_md *lsm)
3160 {
3161         struct lov_oinfo *loi;
3162         __u64 blocks = 0;
3163         int i;
3164
3165         for (i = 0, loi = lsm->lsm_oinfo; i < lsm->lsm_stripe_count;
3166              i++, loi++) {
3167                 blocks += loi->loi_blocks;
3168         }
3169         return blocks;
3170 }
3171 EXPORT_SYMBOL(lov_merge_blocks);
3172
3173 __u64 lov_merge_mtime(struct lov_stripe_md *lsm, __u64 current_time)
3174 {
3175         struct lov_oinfo *loi;
3176         int i;
3177
3178         for (i = 0, loi = lsm->lsm_oinfo; i < lsm->lsm_stripe_count;
3179              i++, loi++) {
3180                 if (loi->loi_mtime > current_time)
3181                         current_time = loi->loi_mtime;
3182         }
3183         return current_time;
3184 }
3185 EXPORT_SYMBOL(lov_merge_mtime);
3186
3187 #if 0
3188 struct lov_multi_wait {
3189         struct ldlm_lock *lock;
3190         wait_queue_t      wait;
3191         int               completed;
3192         int               generation;
3193 };
3194
3195 int lov_complete_many(struct obd_export *exp, struct lov_stripe_md *lsm,
3196                       struct lustre_handle *lockh)
3197 {
3198         struct lov_lock_handles *lov_lockh = NULL;
3199         struct lustre_handle *lov_lockhp;
3200         struct lov_obd *lov;
3201         struct lov_oinfo *loi;
3202         struct lov_multi_wait *queues;
3203         int rc = 0, i;
3204         ENTRY;
3205
3206         if (lsm_bad_magic(lsm))
3207                 RETURN(-EINVAL);
3208
3209         if (!exp || !exp->exp_obd)
3210                 RETURN(-ENODEV);
3211
3212         LASSERT(lockh != NULL);
3213         if (lsm->lsm_stripe_count > 1) {
3214                 lov_lockh = lov_handle2llh(lockh);
3215                 if (lov_lockh == NULL) {
3216                         CERROR("LOV: invalid lov lock handle %p\n", lockh);
3217                         RETURN(-EINVAL);
3218                 }
3219
3220                 lov_lockhp = lov_lockh->llh_handles;
3221         } else {
3222                 lov_lockhp = lockh;
3223         }
3224
3225         OBD_ALLOC(queues, lsm->lsm_stripe_count * sizeof(*queues));
3226         if (queues == NULL)
3227                 GOTO(out, rc = -ENOMEM);
3228
3229         lov = &exp->exp_obd->u.lov;
3230         for (i = 0, loi = lsm->lsm_oinfo; i < lsm->lsm_stripe_count;
3231              i++, loi++, lov_lockhp++) {
3232                 struct ldlm_lock *lock;
3233                 struct obd_device *obd;
3234                 unsigned long irqflags;
3235
3236                 lock = ldlm_handle2lock(lov_lockhp);
3237                 if (lock == NULL) {
3238                         CDEBUG(D_HA, "lov idx %d subobj "LPX64" no lock?\n",
3239                                loi->loi_ost_idx, loi->loi_id);
3240                         queues[i].completed = 1;
3241                         continue;
3242                 }
3243
3244                 queues[i].lock = lock;
3245                 init_waitqueue_entry(&(queues[i].wait), current);
3246                 add_wait_queue(lock->l_waitq, &(queues[i].wait));
3247
3248                 obd = class_exp2obd(lock->l_conn_export);
3249                 if (obd != NULL)
3250                         imp = obd->u.cli.cl_import;
3251                 if (imp != NULL) {
3252                         spin_lock_irqsave(&imp->imp_lock, irqflags);
3253                         queues[i].generation = imp->imp_generation;
3254                         spin_unlock_irqrestore(&imp->imp_lock, irqflags);
3255                 }
3256         }
3257
3258         lwi = LWI_TIMEOUT_INTR(obd_timeout * HZ, ldlm_expired_completion_wait,
3259                                interrupted_completion_wait, &lwd);
3260         rc = l_wait_event_added(check_multi_complete(queues, lsm), &lwi);
3261
3262         for (i = 0; i < lsm->lsm_stripe_count; i++)
3263                 remove_wait_queue(lock->l_waitq, &(queues[i].wait));
3264
3265         if (rc == -EINTR || rc == -ETIMEDOUT) {
3266
3267
3268         }
3269
3270  out:
3271         if (lov_lockh != NULL)
3272                 lov_llh_put(lov_lockh);
3273         RETURN(rc);
3274 }
3275 #endif
3276
3277 void lov_increase_kms(struct obd_export *exp, struct lov_stripe_md *lsm,
3278                       obd_off size)
3279 {
3280         struct lov_oinfo *loi;
3281         int stripe = 0;
3282         __u64 kms;
3283         ENTRY;
3284
3285         if (size > 0)
3286                 stripe = lov_stripe_number(lsm, size - 1);
3287         kms = lov_size_to_stripe(lsm, size, stripe);
3288         loi = &(lsm->lsm_oinfo[stripe]);
3289
3290         CDEBUG(D_INODE, "stripe %d KMS %sincreasing "LPU64"->"LPU64"\n",
3291                stripe, kms > loi->loi_kms ? "" : "not ", loi->loi_kms, kms);
3292         if (kms > loi->loi_kms)
3293                 loi->loi_kms = kms;
3294         EXIT;
3295 }
3296 EXPORT_SYMBOL(lov_increase_kms);
3297
3298 struct obd_ops lov_obd_ops = {
3299         .o_owner               = THIS_MODULE,
3300         .o_attach              = lov_attach,
3301         .o_detach              = lov_detach,
3302         .o_setup               = lov_setup,
3303         .o_cleanup             = lov_cleanup,
3304         .o_process_config      = lov_process_config,
3305         .o_connect             = lov_connect,
3306         .o_disconnect          = lov_disconnect,
3307         .o_statfs              = lov_statfs,
3308         .o_packmd              = lov_packmd,
3309         .o_unpackmd            = lov_unpackmd,
3310         .o_revalidate_md       = lov_revalidate_md,
3311         .o_create              = lov_create,
3312         .o_destroy             = lov_destroy,
3313         .o_getattr             = lov_getattr,
3314         .o_getattr_async       = lov_getattr_async,
3315         .o_setattr             = lov_setattr,
3316         .o_brw                 = lov_brw,
3317         .o_brw_async           = lov_brw_async,
3318         .o_prep_async_page     = lov_prep_async_page,
3319         .o_queue_async_io      = lov_queue_async_io,
3320         .o_set_async_flags     = lov_set_async_flags,
3321         .o_queue_group_io      = lov_queue_group_io,
3322         .o_trigger_group_io    = lov_trigger_group_io,
3323         .o_teardown_async_page = lov_teardown_async_page,
3324         .o_punch               = lov_punch,
3325         .o_sync                = lov_sync,
3326         .o_enqueue             = lov_enqueue,
3327         .o_match               = lov_match,
3328         .o_change_cbdata       = lov_change_cbdata,
3329         .o_cancel              = lov_cancel,
3330         .o_cancel_unused       = lov_cancel_unused,
3331         .o_iocontrol           = lov_iocontrol,
3332         .o_get_info            = lov_get_info,
3333         .o_set_info            = lov_set_info,
3334         .o_llog_init           = lov_llog_init,
3335         .o_llog_finish         = lov_llog_finish,
3336         .o_notify              = lov_notify,
3337 };
3338
3339 int __init lov_init(void)
3340 {
3341         struct lprocfs_static_vars lvars;
3342         int rc;
3343         ENTRY;
3344
3345         lprocfs_init_vars(lov, &lvars);
3346         rc = class_register_type(&lov_obd_ops, NULL, lvars.module_vars,
3347                                  OBD_LOV_DEVICENAME);
3348         RETURN(rc);
3349 }
3350
3351 #ifdef __KERNEL__
3352 static void /*__exit*/ lov_exit(void)
3353 {
3354         class_unregister_type(OBD_LOV_DEVICENAME);
3355 }
3356
3357 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
3358 MODULE_DESCRIPTION("Lustre Logical Object Volume OBD driver");
3359 MODULE_LICENSE("GPL");
3360
3361 module_init(lov_init);
3362 module_exit(lov_exit);
3363 #endif