lustre/obdecho/echo_client.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (c) 2001-2003 Cluster File Systems, Inc.
   5  *
   6  *   This file is part of the Lustre file system, http://www.lustre.org
   7  *   Lustre is a trademark of Cluster File Systems, Inc.
   8  *
   9  *   You may have signed or agreed to another license before downloading
  10  *   this software.  If so, you are bound by the terms and conditions
  11  *   of that agreement, and the following does not apply to you.  See the
  12  *   LICENSE file included with this distribution for more information.
  13  *
  14  *   If you did not agree to a different license, then this copy of Lustre
  15  *   is open source software; you can redistribute it and/or modify it
  16  *   under the terms of version 2 of the GNU General Public License as
  17  *   published by the Free Software Foundation.
  18  *
  19  *   In either case, Lustre is distributed in the hope that it will be
  20  *   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  21  *   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  *   license text for more details.
  23  */
  24
  25 #define DEBUG_SUBSYSTEM S_ECHO
  26 #ifdef __KERNEL__
  27 #include <libcfs/libcfs.h>
  28 #else
  29 #include <liblustre.h>
  30 #endif
  31
  32 #include <obd.h>
  33 #include <obd_support.h>
  34 #include <obd_class.h>
  35 #include <obd_echo.h>
  36 #include <lustre_ver.h>
  37 #include <lustre_debug.h>
  38 #include <lprocfs_status.h>
  39
  40 static obd_id last_object_id;
  41
  42 #if 0
  43 static void
  44 echo_printk_object (char *msg, struct ec_object *eco)
  45 {
  46         struct lov_stripe_md *lsm = eco->eco_lsm;
  47         int                   i;
  48
  49         printk (KERN_INFO "Lustre: %s: object %p: "LPX64", refs %d%s: "LPX64
  50                 "=%u!%u\n", msg, eco, eco->eco_id, eco->eco_refcount,
  51                 eco->eco_deleted ? "(deleted) " : "",
  52                 lsm->lsm_object_id, lsm->lsm_stripe_size,
  53                 lsm->lsm_stripe_count);
  54
  55         for (i = 0; i < lsm->lsm_stripe_count; i++)
  56                 printk (KERN_INFO "Lustre:   @%2u:"LPX64"\n",
  57                         lsm->lsm_oinfo[i].loi_ost_idx,
  58                         lsm->lsm_oinfo[i].loi_id);
  59 }
  60 #endif
  61
  62 static struct ec_object *
  63 echo_find_object_locked (struct obd_device *obd, obd_id id)
  64 {
  65         struct echo_client_obd *ec = &obd->u.echo_client;
  66         struct ec_object       *eco = NULL;
  67         struct list_head       *el;
  68
  69         list_for_each (el, &ec->ec_objects) {
  70                 eco = list_entry (el, struct ec_object, eco_obj_chain);
  71
  72                 if (eco->eco_id == id)
  73                         return (eco);
  74         }
  75         return (NULL);
  76 }
  77
  78 static int
  79 echo_copyout_lsm (struct lov_stripe_md *lsm, void *ulsm, int ulsm_nob)
  80 {
  81         int nob;
  82
  83         nob = offsetof (struct lov_stripe_md, lsm_oinfo[lsm->lsm_stripe_count]);
  84         if (nob > ulsm_nob)
  85                 return (-EINVAL);
  86
  87         if (copy_to_user (ulsm, lsm, nob))
  88                 return (-EFAULT);
  89
  90         return (0);
  91 }
  92
  93 static int
  94 echo_copyin_lsm (struct obd_device *obd, struct lov_stripe_md *lsm,
  95                  void *ulsm, int ulsm_nob)
  96 {
  97         struct echo_client_obd *ec = &obd->u.echo_client;
  98         int                     nob;
  99
 100         if (ulsm_nob < sizeof (*lsm))
 101                 return (-EINVAL);
 102
 103         if (copy_from_user (lsm, ulsm, sizeof (*lsm)))
 104                 return (-EFAULT);
 105
 106         nob = lsm->lsm_stripe_count * sizeof (lsm->lsm_oinfo[0]);
 107
 108         if (ulsm_nob < nob ||
 109             lsm->lsm_stripe_count > ec->ec_nstripes ||
 110             lsm->lsm_magic != LOV_MAGIC ||
 111             (lsm->lsm_stripe_size & (CFS_PAGE_SIZE - 1)) != 0 ||
 112             ((__u64)lsm->lsm_stripe_size * lsm->lsm_stripe_count > ~0UL))
 113                 return (-EINVAL);
 114
 115         if (copy_from_user(lsm->lsm_oinfo,
 116                            ((struct lov_stripe_md *)ulsm)->lsm_oinfo, nob))
 117                 return (-EFAULT);
 118
 119         return (0);
 120 }
 121
 122 static struct ec_object *
 123 echo_allocate_object (struct obd_device *obd)
 124 {
 125         struct echo_client_obd *ec = &obd->u.echo_client;
 126         struct ec_object       *eco;
 127         int rc;
 128
 129         OBD_ALLOC(eco, sizeof (*eco));
 130         if (eco == NULL)
 131                 return NULL;
 132
 133         rc = obd_alloc_memmd(ec->ec_exp, &eco->eco_lsm);
 134         if (rc < 0) {
 135                 OBD_FREE(eco, sizeof (*eco));
 136                 return NULL;
 137         }
 138
 139         eco->eco_device = obd;
 140         eco->eco_deleted = 0;
 141         eco->eco_refcount = 0;
 142         eco->eco_lsm->lsm_magic = LOV_MAGIC;
 143         /* leave stripe count 0 by default */
 144
 145         return (eco);
 146 }
 147
 148 static void
 149 echo_free_object (struct ec_object *eco)
 150 {
 151         struct obd_device      *obd = eco->eco_device;
 152         struct echo_client_obd *ec = &obd->u.echo_client;
 153
 154         LASSERT (eco->eco_refcount == 0);
 155         obd_free_memmd(ec->ec_exp, &eco->eco_lsm);
 156         OBD_FREE (eco, sizeof (*eco));
 157 }
 158
 159 static int echo_create_object(struct obd_device *obd, int on_target,
 160                               struct obdo *oa, void *ulsm, int ulsm_nob,
 161                               struct obd_trans_info *oti)
 162 {
 163         struct echo_client_obd *ec = &obd->u.echo_client;
 164         struct ec_object       *eco2;
 165         struct ec_object       *eco;
 166         struct lov_stripe_md   *lsm;
 167         int                     rc;
 168         int                     i, idx;
 169
 170         if ((oa->o_valid & OBD_MD_FLID) == 0 && /* no obj id */
 171             (on_target ||                       /* set_stripe */
 172              ec->ec_nstripes != 0)) {           /* LOV */
 173                 CERROR ("No valid oid\n");
 174                 return (-EINVAL);
 175         }
 176
 177         if (ulsm != NULL) {
 178                 eco = echo_allocate_object (obd);
 179                 if (eco == NULL)
 180                         return (-ENOMEM);
 181
 182                 lsm = eco->eco_lsm;
 183
 184                 rc = echo_copyin_lsm (obd, lsm, ulsm, ulsm_nob);
 185                 if (rc != 0)
 186                         goto failed;
 187
 188                 /* setup object ID here for !on_target and LOV hint */
 189                 if ((oa->o_valid & OBD_MD_FLID) != 0)
 190                         eco->eco_id = lsm->lsm_object_id = oa->o_id;
 191
 192                 if (lsm->lsm_stripe_count == 0)
 193                         lsm->lsm_stripe_count = ec->ec_nstripes;
 194
 195                 if (lsm->lsm_stripe_size == 0)
 196                         lsm->lsm_stripe_size = CFS_PAGE_SIZE;
 197
 198                 idx = ll_rand();
 199
 200                 /* setup stripes: indices + default ids if required */
 201                 for (i = 0; i < lsm->lsm_stripe_count; i++) {
 202                         if (lsm->lsm_oinfo[i].loi_id == 0)
 203                                 lsm->lsm_oinfo[i].loi_id = lsm->lsm_object_id;
 204
 205                         lsm->lsm_oinfo[i].loi_ost_idx =
 206                                 (idx + i) % ec->ec_nstripes;
 207                 }
 208         } else {
 209                 OBD_ALLOC(eco, sizeof(*eco));
 210                 eco->eco_device = obd;
 211                 lsm = NULL;
 212         }
 213
 214         if (oa->o_id == 0)
 215                 oa->o_id = ++last_object_id;
 216
 217         if (on_target) {
 218                 oa->o_gr = FILTER_GROUP_ECHO;
 219                 oa->o_valid |= OBD_MD_FLGROUP;
 220
 221                 rc = obd_create(ec->ec_exp, oa, &lsm, oti);
 222                 if (rc != 0)
 223                         goto failed;
 224
 225                 /* See what object ID we were given */
 226                 eco->eco_id = oa->o_id = lsm->lsm_object_id;
 227                 oa->o_valid |= OBD_MD_FLID;
 228
 229                 LASSERT(eco->eco_lsm == NULL || eco->eco_lsm == lsm);
 230                 eco->eco_lsm = lsm;
 231         }
 232
 233         spin_lock (&ec->ec_lock);
 234
 235         eco2 = echo_find_object_locked (obd, oa->o_id);
 236         if (eco2 != NULL) {                     /* conflict */
 237                 spin_unlock (&ec->ec_lock);
 238
 239                 CERROR ("Can't create object id "LPX64": id already exists%s\n",
 240                         oa->o_id, on_target ? " (undoing create)" : "");
 241
 242                 if (on_target)
 243                         obd_destroy(ec->ec_exp, oa, lsm, oti, NULL);
 244
 245                 rc = -EEXIST;
 246                 goto failed;
 247         }
 248
 249         list_add (&eco->eco_obj_chain, &ec->ec_objects);
 250         spin_unlock (&ec->ec_lock);
 251         CDEBUG (D_INFO,
 252                 "created %p: "LPX64"=%u#%u@%u refs %d del %d\n",
 253                 eco, eco->eco_id,
 254                 eco->eco_lsm->lsm_stripe_size,
 255                 eco->eco_lsm->lsm_stripe_count,
 256                 eco->eco_lsm->lsm_oinfo[0].loi_ost_idx,
 257                 eco->eco_refcount, eco->eco_deleted);
 258         return (0);
 259
 260  failed:
 261         echo_free_object (eco);
 262         return (rc);
 263 }
 264
 265 static int
 266 echo_get_object (struct ec_object **ecop, struct obd_device *obd,
 267                  struct obdo *oa)
 268 {
 269         struct echo_client_obd *ec = &obd->u.echo_client;
 270         struct ec_object       *eco;
 271         struct ec_object       *eco2;
 272         int                     rc;
 273
 274         if ((oa->o_valid & OBD_MD_FLID) == 0 ||
 275             oa->o_id == 0)                      /* disallow use of object id 0 */
 276         {
 277                 CERROR ("No valid oid\n");
 278                 return (-EINVAL);
 279         }
 280
 281         spin_lock (&ec->ec_lock);
 282         eco = echo_find_object_locked (obd, oa->o_id);
 283         if (eco != NULL) {
 284                 if (eco->eco_deleted) {           /* being deleted */
 285                         spin_unlock(&ec->ec_lock);/* (see comment in cleanup) */
 286                         return (-EAGAIN);
 287                 }
 288
 289                 eco->eco_refcount++;
 290                 spin_unlock (&ec->ec_lock);
 291                 *ecop = eco;
 292                 CDEBUG (D_INFO,
 293                         "found %p: "LPX64"=%u#%u@%u refs %d del %d\n",
 294                         eco, eco->eco_id,
 295                         eco->eco_lsm->lsm_stripe_size,
 296                         eco->eco_lsm->lsm_stripe_count,
 297                         eco->eco_lsm->lsm_oinfo[0].loi_ost_idx,
 298                         eco->eco_refcount, eco->eco_deleted);
 299                 return (0);
 300         }
 301         spin_unlock (&ec->ec_lock);
 302
 303         if (ec->ec_nstripes != 0)               /* striping required */
 304                 return (-ENOENT);
 305
 306         eco = echo_allocate_object (obd);
 307         if (eco == NULL)
 308                 return (-ENOMEM);
 309
 310         eco->eco_id = eco->eco_lsm->lsm_object_id = oa->o_id;
 311
 312         spin_lock (&ec->ec_lock);
 313
 314         eco2 = echo_find_object_locked (obd, oa->o_id);
 315         if (eco2 == NULL) {                     /* didn't race */
 316                 list_add (&eco->eco_obj_chain, &ec->ec_objects);
 317                 spin_unlock (&ec->ec_lock);
 318                 eco->eco_refcount = 1;
 319                 *ecop = eco;
 320                 CDEBUG (D_INFO,
 321                         "created %p: "LPX64"=%u#%u@%d refs %d del %d\n",
 322                         eco, eco->eco_id,
 323                         eco->eco_lsm->lsm_stripe_size,
 324                         eco->eco_lsm->lsm_stripe_count,
 325                         eco->eco_lsm->lsm_oinfo[0].loi_ost_idx,
 326                         eco->eco_refcount, eco->eco_deleted);
 327                 return (0);
 328         }
 329
 330         if (eco2->eco_deleted)
 331                 rc = -EAGAIN;                   /* lose race */
 332         else {
 333                 eco2->eco_refcount++;           /* take existing */
 334                 *ecop = eco2;
 335                 rc = 0;
 336                 LASSERT (eco2->eco_id == eco2->eco_lsm->lsm_object_id);
 337                 CDEBUG (D_INFO,
 338                         "found(2) %p: "LPX64"=%u#%u@%d refs %d del %d\n",
 339                         eco2, eco2->eco_id,
 340                         eco2->eco_lsm->lsm_stripe_size,
 341                         eco2->eco_lsm->lsm_stripe_count,
 342                         eco2->eco_lsm->lsm_oinfo[0].loi_ost_idx,
 343                         eco2->eco_refcount, eco2->eco_deleted);
 344         }
 345
 346         spin_unlock (&ec->ec_lock);
 347
 348         echo_free_object (eco);
 349         return (rc);
 350 }
 351
 352 static void
 353 echo_put_object (struct ec_object *eco)
 354 {
 355         struct obd_device      *obd = eco->eco_device;
 356         struct echo_client_obd *ec = &obd->u.echo_client;
 357
 358         /* Release caller's ref on the object.
 359          * delete => mark for deletion when last ref goes
 360          */
 361
 362         spin_lock (&ec->ec_lock);
 363
 364         eco->eco_refcount--;
 365         LASSERT (eco->eco_refcount >= 0);
 366
 367         CDEBUG(D_INFO, "put %p: "LPX64"=%u#%u@%d refs %d del %d\n",
 368                eco, eco->eco_id,
 369                eco->eco_lsm->lsm_stripe_size,
 370                eco->eco_lsm->lsm_stripe_count,
 371                eco->eco_lsm->lsm_oinfo[0].loi_ost_idx,
 372                eco->eco_refcount, eco->eco_deleted);
 373
 374         if (eco->eco_refcount != 0 || !eco->eco_deleted) {
 375                 spin_unlock (&ec->ec_lock);
 376                 return;
 377         }
 378
 379         spin_unlock (&ec->ec_lock);
 380
 381         /* NB leave obj in the object list.  We must prevent anyone from
 382          * attempting to enqueue on this object number until we can be
 383          * sure there will be no more lock callbacks.
 384          */
 385         obd_cancel_unused(ec->ec_exp, eco->eco_lsm, 0, NULL);
 386
 387         /* now we can let it go */
 388         spin_lock (&ec->ec_lock);
 389         list_del (&eco->eco_obj_chain);
 390         spin_unlock (&ec->ec_lock);
 391
 392         LASSERT (eco->eco_refcount == 0);
 393
 394         echo_free_object (eco);
 395 }
 396
 397 static void
 398 echo_get_stripe_off_id (struct lov_stripe_md *lsm, obd_off *offp, obd_id *idp)
 399 {
 400         unsigned long stripe_count;
 401         unsigned long stripe_size;
 402         unsigned long width;
 403         unsigned long woffset;
 404         int           stripe_index;
 405         obd_off       offset;
 406
 407         if (lsm->lsm_stripe_count <= 1)
 408                 return;
 409
 410         offset       = *offp;
 411         stripe_size  = lsm->lsm_stripe_size;
 412         stripe_count = lsm->lsm_stripe_count;
 413
 414         /* width = # bytes in all stripes */
 415         width = stripe_size * stripe_count;
 416
 417         /* woffset = offset within a width; offset = whole number of widths */
 418         woffset = do_div (offset, width);
 419
 420         stripe_index = woffset / stripe_size;
 421
 422         *idp = lsm->lsm_oinfo[stripe_index].loi_id;
 423         *offp = offset * stripe_size + woffset % stripe_size;
 424 }
 425
 426 static void
 427 echo_client_page_debug_setup(struct lov_stripe_md *lsm,
 428                              cfs_page_t *page, int rw, obd_id id,
 429                              obd_off offset, obd_off count)
 430 {
 431         char    *addr;
 432         obd_off  stripe_off;
 433         obd_id   stripe_id;
 434         int      delta;
 435
 436         /* no partial pages on the client */
 437         LASSERT(count == CFS_PAGE_SIZE);
 438
 439         addr = cfs_kmap(page);
 440
 441         for (delta = 0; delta < CFS_PAGE_SIZE; delta += OBD_ECHO_BLOCK_SIZE) {
 442                 if (rw == OBD_BRW_WRITE) {
 443                         stripe_off = offset + delta;
 444                         stripe_id = id;
 445                         echo_get_stripe_off_id(lsm, &stripe_off, &stripe_id);
 446                 } else {
 447                         stripe_off = 0xdeadbeef00c0ffeeULL;
 448                         stripe_id = 0xdeadbeef00c0ffeeULL;
 449                 }
 450                 block_debug_setup(addr + delta, OBD_ECHO_BLOCK_SIZE,
 451                                   stripe_off, stripe_id);
 452         }
 453
 454         cfs_kunmap(page);
 455 }
 456
 457 static int echo_client_page_debug_check(struct lov_stripe_md *lsm,
 458                                         cfs_page_t *page, obd_id id,
 459                                         obd_off offset, obd_off count)
 460 {
 461         obd_off stripe_off;
 462         obd_id  stripe_id;
 463         char   *addr;
 464         int     delta;
 465         int     rc;
 466         int     rc2;
 467
 468         /* no partial pages on the client */
 469         LASSERT(count == CFS_PAGE_SIZE);
 470
 471         addr = cfs_kmap(page);
 472
 473         for (rc = delta = 0; delta < CFS_PAGE_SIZE; delta += OBD_ECHO_BLOCK_SIZE) {
 474                 stripe_off = offset + delta;
 475                 stripe_id = id;
 476                 echo_get_stripe_off_id (lsm, &stripe_off, &stripe_id);
 477
 478                 rc2 = block_debug_check("test_brw",
 479                                         addr + delta, OBD_ECHO_BLOCK_SIZE,
 480                                         stripe_off, stripe_id);
 481                 if (rc2 != 0) {
 482                         CERROR ("Error in echo object "LPX64"\n", id);
 483                         rc = rc2;
 484                 }
 485         }
 486
 487         cfs_kunmap(page);
 488         return rc;
 489 }
 490
 491 static int echo_client_kbrw(struct obd_device *obd, int rw, struct obdo *oa,
 492                             struct lov_stripe_md *lsm, obd_off offset,
 493                             obd_size count, struct obd_trans_info *oti)
 494 {
 495         struct echo_client_obd *ec = &obd->u.echo_client;
 496         struct obd_info         oinfo = { { { 0 } } };
 497         obd_count               npages;
 498         struct brw_page        *pga;
 499         struct brw_page        *pgp;
 500         obd_off                 off;
 501         int                     i;
 502         int                     rc;
 503         int                     verify;
 504         int                     gfp_mask;
 505
 506         verify = ((oa->o_id) != ECHO_PERSISTENT_OBJID &&
 507                   (oa->o_valid & OBD_MD_FLFLAGS) != 0 &&
 508                   (oa->o_flags & OBD_FL_DEBUG_CHECK) != 0);
 509
 510         gfp_mask = ((oa->o_id & 2) == 0) ? CFS_ALLOC_STD : CFS_ALLOC_HIGHUSER;
 511
 512         LASSERT(rw == OBD_BRW_WRITE || rw == OBD_BRW_READ);
 513         LASSERT(lsm != NULL);
 514         LASSERT(lsm->lsm_object_id == oa->o_id);
 515
 516         if (count <= 0 ||
 517             (count & (CFS_PAGE_SIZE - 1)) != 0)
 518                 return (-EINVAL);
 519
 520         /* XXX think again with misaligned I/O */
 521         npages = count >> CFS_PAGE_SHIFT;
 522
 523         OBD_ALLOC(pga, npages * sizeof(*pga));
 524         if (pga == NULL)
 525                 return (-ENOMEM);
 526
 527         for (i = 0, pgp = pga, off = offset;
 528              i < npages;
 529              i++, pgp++, off += CFS_PAGE_SIZE) {
 530
 531                 LASSERT (pgp->pg == NULL);      /* for cleanup */
 532
 533                 rc = -ENOMEM;
 534                 pgp->pg = cfs_alloc_page (gfp_mask);
 535                 if (pgp->pg == NULL)
 536                         goto out;
 537
 538                 pgp->count = CFS_PAGE_SIZE;
 539                 pgp->off = off;
 540                 pgp->flag = 0;
 541
 542                 if (verify)
 543                         echo_client_page_debug_setup(lsm, pgp->pg, rw,
 544                                                      oa->o_id, off, pgp->count);
 545         }
 546
 547         oinfo.oi_oa = oa;
 548         oinfo.oi_md = lsm;
 549         rc = obd_brw(rw, ec->ec_exp, &oinfo, npages, pga, oti);
 550
 551  out:
 552         if (rc != 0 || rw != OBD_BRW_READ)
 553                 verify = 0;
 554
 555         for (i = 0, pgp = pga; i < npages; i++, pgp++) {
 556                 if (pgp->pg == NULL)
 557                         continue;
 558
 559                 if (verify) {
 560                         int vrc;
 561                         vrc = echo_client_page_debug_check(lsm, pgp->pg, oa->o_id,
 562                                                            pgp->off, pgp->count);
 563                         if (vrc != 0 && rc == 0)
 564                                 rc = vrc;
 565                 }
 566                 cfs_free_page(pgp->pg);
 567         }
 568         OBD_FREE(pga, npages * sizeof(*pga));
 569         return (rc);
 570 }
 571
 572 #ifdef __KERNEL__
 573 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 574 static int echo_client_ubrw(struct obd_device *obd, int rw,
 575                             struct obdo *oa, struct lov_stripe_md *lsm,
 576                             obd_off offset, obd_size count, char *buffer,
 577                             struct obd_trans_info *oti)
 578 {
 579         struct echo_client_obd *ec = &obd->u.echo_client;
 580         struct obd_info         oinfo = { { { 0 } } };
 581         obd_count               npages;
 582         struct brw_page        *pga;
 583         struct brw_page        *pgp;
 584         obd_off                 off;
 585         struct kiobuf          *kiobuf;
 586         int                     i;
 587         int                     rc;
 588
 589         LASSERT (rw == OBD_BRW_WRITE || rw == OBD_BRW_READ);
 590
 591         /* NB: for now, only whole pages, page aligned */
 592
 593         if (count <= 0 ||
 594             ((long)buffer & (CFS_PAGE_SIZE - 1)) != 0 ||
 595             (count & (CFS_PAGE_SIZE - 1)) != 0 ||
 596             (lsm != NULL && lsm->lsm_object_id != oa->o_id))
 597                 return (-EINVAL);
 598
 599         /* XXX think again with misaligned I/O */
 600         npages = count >> CFS_PAGE_SHIFT;
 601
 602         OBD_ALLOC(pga, npages * sizeof(*pga));
 603         if (pga == NULL)
 604                 return (-ENOMEM);
 605
 606         rc = alloc_kiovec (1, &kiobuf);
 607         if (rc != 0)
 608                 goto out_1;
 609
 610         rc = map_user_kiobuf ((rw == OBD_BRW_READ) ? READ : WRITE,
 611                               kiobuf, (unsigned long)buffer, count);
 612         if (rc != 0)
 613                 goto out_2;
 614
 615         LASSERT (kiobuf->offset == 0);
 616         LASSERT (kiobuf->nr_pages == npages);
 617
 618         for (i = 0, off = offset, pgp = pga;
 619              i < npages;
 620              i++, off += CFS_PAGE_SIZE, pgp++) {
 621                 pgp->off = off;
 622                 pgp->pg = kiobuf->maplist[i];
 623                 pgp->count = CFS_PAGE_SIZE;
 624                 pgp->flag = 0;
 625         }
 626
 627         oinfo.oi_oa = oa;
 628         oinfo.oi_md = lsm;
 629         rc = obd_brw(rw, ec->ec_exp, &oinfo, npages, pga, oti);
 630
 631         //        if (rw == OBD_BRW_READ)
 632         //                mark_dirty_kiobuf (kiobuf, count);
 633
 634         unmap_kiobuf (kiobuf);
 635  out_2:
 636         free_kiovec (1, &kiobuf);
 637  out_1:
 638         OBD_FREE(pga, npages * sizeof(*pga));
 639         return (rc);
 640 }
 641 #else
 642 static int echo_client_ubrw(struct obd_device *obd, int rw,
 643                             struct obdo *oa, struct lov_stripe_md *lsm,
 644                             obd_off offset, obd_size count, char *buffer,
 645                             struct obd_trans_info *oti)
 646 {
 647 #warning "echo_client_ubrw() needs to be ported on 2.6 yet"
 648         LBUG();
 649         return 0;
 650 }
 651 #endif
 652 #endif
 653
 654 struct echo_async_state;
 655
 656 #define EAP_MAGIC 79277927
 657 struct echo_async_page {
 658         int                     eap_magic;
 659         cfs_page_t             *eap_page;
 660         void                    *eap_cookie;
 661         obd_off                 eap_off;
 662         struct echo_async_state *eap_eas;
 663         struct list_head        eap_item;
 664 };
 665
 666 #define EAP_FROM_COOKIE(c)                                                      \
 667         (LASSERT(((struct echo_async_page *)(c))->eap_magic == EAP_MAGIC),      \
 668          (struct echo_async_page *)(c))
 669
 670 struct echo_async_state {
 671         spinlock_t              eas_lock;
 672         obd_off                 eas_next_offset;
 673         obd_off                 eas_end_offset;
 674         int                     eas_in_flight;
 675         int                     eas_rc;
 676         cfs_waitq_t             eas_waitq;
 677         struct list_head        eas_avail;
 678         struct obdo             eas_oa;
 679         struct lov_stripe_md    *eas_lsm;
 680 };
 681
 682 static int eas_should_wake(struct echo_async_state *eas)
 683 {
 684         int rc = 0;
 685
 686         spin_lock(&eas->eas_lock);
 687         if (eas->eas_rc == 0 && !list_empty(&eas->eas_avail))
 688             rc = 1;
 689         spin_unlock(&eas->eas_lock);
 690         return rc;
 691 };
 692
 693 static int ec_ap_make_ready(void *data, int cmd)
 694 {
 695         /* our pages are issued ready */
 696         LBUG();
 697         return 0;
 698 }
 699 static int ec_ap_refresh_count(void *data, int cmd)
 700 {
 701         /* our pages are issued with a stable count */
 702         LBUG();
 703         return CFS_PAGE_SIZE;
 704 }
 705 static void ec_ap_fill_obdo(void *data, int cmd, struct obdo *oa)
 706 {
 707         struct echo_async_page *eap = EAP_FROM_COOKIE(data);
 708
 709         memcpy(oa, &eap->eap_eas->eas_oa, sizeof(*oa));
 710 }
 711
 712 static int ec_ap_completion(void *data, int cmd, struct obdo *oa, int rc)
 713 {
 714         struct echo_async_page *eap = EAP_FROM_COOKIE(data);
 715         struct echo_async_state *eas;
 716
 717         eas = eap->eap_eas;
 718
 719         if (cmd == OBD_BRW_READ &&
 720             eas->eas_oa.o_id != ECHO_PERSISTENT_OBJID &&
 721             (eas->eas_oa.o_valid & OBD_MD_FLFLAGS) != 0 &&
 722             (eas->eas_oa.o_flags & OBD_FL_DEBUG_CHECK) != 0)
 723                 echo_client_page_debug_check(eas->eas_lsm, eap->eap_page,
 724                                              eas->eas_oa.o_id, eap->eap_off,
 725                                              CFS_PAGE_SIZE);
 726
 727         spin_lock(&eas->eas_lock);
 728         if (rc && !eas->eas_rc)
 729                 eas->eas_rc = rc;
 730         eas->eas_in_flight--;
 731         list_add(&eap->eap_item, &eas->eas_avail);
 732         cfs_waitq_signal(&eas->eas_waitq);
 733         spin_unlock(&eas->eas_lock);
 734         return 0;
 735 }
 736
 737 static struct obd_async_page_ops ec_async_page_ops = {
 738         .ap_make_ready =        ec_ap_make_ready,
 739         .ap_refresh_count =     ec_ap_refresh_count,
 740         .ap_fill_obdo =         ec_ap_fill_obdo,
 741         .ap_completion =        ec_ap_completion,
 742 };
 743
 744 static int echo_client_async_page(struct obd_export *exp, int rw,
 745                                    struct obdo *oa, struct lov_stripe_md *lsm,
 746                                    obd_off offset, obd_size count,
 747                                    obd_size batching)
 748 {
 749         obd_count npages, i;
 750         struct echo_async_page *eap;
 751         struct echo_async_state eas;
 752         int rc = 0;
 753         struct echo_async_page **aps = NULL;
 754
 755         ENTRY;
 756 #if 0
 757         int                     verify;
 758         int                     gfp_mask;
 759
 760         verify = ((oa->o_id) != ECHO_PERSISTENT_OBJID &&
 761                   (oa->o_valid & OBD_MD_FLFLAGS) != 0 &&
 762                   (oa->o_flags & OBD_FL_DEBUG_CHECK) != 0);
 763
 764         gfp_mask = ((oa->o_id & 2) == 0) ? GFP_KERNEL : GFP_HIGHUSER;
 765 #endif
 766
 767         LASSERT(rw == OBD_BRW_WRITE || rw == OBD_BRW_READ);
 768
 769         if (count <= 0 ||
 770             (count & (CFS_PAGE_SIZE - 1)) != 0 ||
 771             (lsm != NULL &&
 772              lsm->lsm_object_id != oa->o_id))
 773                 return (-EINVAL);
 774
 775         /* XXX think again with misaligned I/O */
 776         npages = batching >> CFS_PAGE_SHIFT;
 777
 778         memcpy(&eas.eas_oa, oa, sizeof(*oa));
 779         eas.eas_next_offset = offset;
 780         eas.eas_end_offset = offset + count;
 781         spin_lock_init(&eas.eas_lock);
 782         cfs_waitq_init(&eas.eas_waitq);
 783         eas.eas_in_flight = 0;
 784         eas.eas_rc = 0;
 785         eas.eas_lsm = lsm;
 786         CFS_INIT_LIST_HEAD(&eas.eas_avail);
 787
 788         OBD_ALLOC(aps, npages * sizeof aps[0]);
 789         if (aps == NULL)
 790                 return (-ENOMEM);
 791
 792         /* prepare the group of pages that we're going to be keeping
 793          * in flight */
 794         for (i = 0; i < npages; i++) {
 795                 cfs_page_t *page = cfs_alloc_page(CFS_ALLOC_STD);
 796                 if (page == NULL)
 797                         GOTO(out, rc = -ENOMEM);
 798
 799                 OBD_ALLOC(eap, sizeof(*eap));
 800                 if (eap == NULL) {
 801                         cfs_free_page(page);
 802                         GOTO(out, rc = -ENOMEM);
 803                 }
 804
 805                 eap->eap_magic = EAP_MAGIC;
 806                 eap->eap_page = page;
 807                 eap->eap_eas = &eas;
 808                 list_add_tail(&eap->eap_item, &eas.eas_avail);
 809                 aps[i] = eap;
 810         }
 811
 812         /* first we spin queueing io and being woken by its completion */
 813         spin_lock(&eas.eas_lock);
 814         for(;;) {
 815                 int rc;
 816
 817                 /* sleep until we have a page to send */
 818                 spin_unlock(&eas.eas_lock);
 819                 rc = wait_event_interruptible(eas.eas_waitq,
 820                                               eas_should_wake(&eas));
 821                 spin_lock(&eas.eas_lock);
 822                 if (rc && !eas.eas_rc)
 823                         eas.eas_rc = rc;
 824                 if (eas.eas_rc)
 825                         break;
 826                 if (list_empty(&eas.eas_avail))
 827                         continue;
 828                 eap = list_entry(eas.eas_avail.next, struct echo_async_page,
 829                                  eap_item);
 830                 list_del(&eap->eap_item);
 831                 spin_unlock(&eas.eas_lock);
 832
 833                 /* unbind the eap from its old page offset */
 834                 if (eap->eap_cookie != NULL) {
 835                         obd_teardown_async_page(exp, lsm, NULL,
 836                                                 eap->eap_cookie);
 837                         eap->eap_cookie = NULL;
 838                 }
 839
 840                 eas.eas_next_offset += CFS_PAGE_SIZE;
 841                 eap->eap_off = eas.eas_next_offset;
 842
 843                 rc = obd_prep_async_page(exp, lsm, NULL, eap->eap_page,
 844                                          eap->eap_off, &ec_async_page_ops,
 845                                          eap, &eap->eap_cookie);
 846                 if (rc) {
 847                         spin_lock(&eas.eas_lock);
 848                         eas.eas_rc = rc;
 849                         break;
 850                 }
 851
 852                 if (oa->o_id != ECHO_PERSISTENT_OBJID &&
 853                     (oa->o_valid & OBD_MD_FLFLAGS) != 0 &&
 854                     (oa->o_flags & OBD_FL_DEBUG_CHECK) != 0)
 855                         echo_client_page_debug_setup(lsm, eap->eap_page, rw,
 856                                                      oa->o_id,
 857                                                      eap->eap_off, CFS_PAGE_SIZE);
 858
 859                 /* always asserts urgent, which isn't quite right */
 860                 rc = obd_queue_async_io(exp, lsm, NULL, eap->eap_cookie,
 861                                         rw, 0, CFS_PAGE_SIZE, 0,
 862                                         ASYNC_READY | ASYNC_URGENT |
 863                                         ASYNC_COUNT_STABLE);
 864                 spin_lock(&eas.eas_lock);
 865                 if (rc && !eas.eas_rc) {
 866                         eas.eas_rc = rc;
 867                         break;
 868                 }
 869                 eas.eas_in_flight++;
 870                 if (eas.eas_next_offset == eas.eas_end_offset)
 871                         break;
 872         }
 873
 874         /* still hold the eas_lock here.. */
 875
 876         /* now we just spin waiting for all the rpcs to complete */
 877         while(eas.eas_in_flight) {
 878                 spin_unlock(&eas.eas_lock);
 879                 wait_event_interruptible(eas.eas_waitq,
 880                                          eas.eas_in_flight == 0);
 881                 spin_lock(&eas.eas_lock);
 882         }
 883         spin_unlock(&eas.eas_lock);
 884
 885 out:
 886         if (aps != NULL) {
 887                 for (i = 0; i < npages; ++ i) {
 888                         cfs_page_t *page;
 889
 890                         eap = aps[i];
 891                         page = eap->eap_page;
 892                         if (eap->eap_cookie != NULL)
 893                                 obd_teardown_async_page(exp, lsm, NULL,
 894                                                         eap->eap_cookie);
 895                         OBD_FREE(eap, sizeof(*eap));
 896                         cfs_free_page(page);
 897                 }
 898                 OBD_FREE(aps, npages * sizeof aps[0]);
 899         }
 900
 901         RETURN(rc);
 902 }
 903
 904 static int echo_client_prep_commit(struct obd_export *exp, int rw,
 905                                    struct obdo *oa, struct lov_stripe_md *lsm,
 906                                    obd_off offset, obd_size count,
 907                                    obd_size batch, struct obd_trans_info *oti)
 908 {
 909         struct obd_ioobj ioo;
 910         struct niobuf_local *lnb;
 911         struct niobuf_remote *rnb;
 912         obd_off off;
 913         obd_size npages, tot_pages;
 914         int i, ret = 0;
 915         ENTRY;
 916
 917         if (count <= 0 || (count & (CFS_PAGE_SIZE - 1)) != 0 ||
 918             (lsm != NULL && lsm->lsm_object_id != oa->o_id))
 919                 RETURN(-EINVAL);
 920
 921         npages = batch >> CFS_PAGE_SHIFT;
 922         tot_pages = count >> CFS_PAGE_SHIFT;
 923
 924         OBD_ALLOC(lnb, npages * sizeof(struct niobuf_local));
 925         OBD_ALLOC(rnb, npages * sizeof(struct niobuf_remote));
 926
 927         if (lnb == NULL || rnb == NULL)
 928                 GOTO(out, ret = -ENOMEM);
 929
 930         obdo_to_ioobj(oa, &ioo);
 931
 932         off = offset;
 933
 934         for(; tot_pages; tot_pages -= npages) {
 935                 if (tot_pages < npages)
 936                         npages = tot_pages;
 937
 938                 for (i = 0; i < npages; i++, off += CFS_PAGE_SIZE) {
 939                         rnb[i].offset = off;
 940                         rnb[i].len = CFS_PAGE_SIZE;
 941                 }
 942
 943                 ioo.ioo_bufcnt = npages;
 944                 oti->oti_transno = 0;
 945
 946                 ret = obd_preprw(rw, exp, oa, 1, &ioo, npages, rnb, lnb, oti);
 947                 if (ret != 0)
 948                         GOTO(out, ret);
 949
 950                 for (i = 0; i < npages; i++) {
 951                         cfs_page_t *page = lnb[i].page;
 952
 953                         /* read past eof? */
 954                         if (page == NULL && lnb[i].rc == 0)
 955                                 continue;
 956
 957                         if (oa->o_id == ECHO_PERSISTENT_OBJID ||
 958                             (oa->o_valid & OBD_MD_FLFLAGS) == 0 ||
 959                             (oa->o_flags & OBD_FL_DEBUG_CHECK) == 0)
 960                                 continue;
 961
 962                         if (rw == OBD_BRW_WRITE)
 963                                 echo_client_page_debug_setup(lsm, page, rw,
 964                                                              oa->o_id,
 965                                                              rnb[i].offset,
 966                                                              rnb[i].len);
 967                         else
 968                                 echo_client_page_debug_check(lsm, page,
 969                                                              oa->o_id,
 970                                                              rnb[i].offset,
 971                                                              rnb[i].len);
 972                 }
 973
 974                 ret = obd_commitrw(rw, exp, oa, 1, &ioo, npages, lnb, oti, ret);
 975                 if (ret != 0)
 976                         GOTO(out, ret);
 977         }
 978
 979 out:
 980         if (lnb)
 981                 OBD_FREE(lnb, npages * sizeof(struct niobuf_local));
 982         if (rnb)
 983                 OBD_FREE(rnb, npages * sizeof(struct niobuf_remote));
 984         RETURN(ret);
 985 }
 986
 987 int echo_client_brw_ioctl(int rw, struct obd_export *exp,
 988                           struct obd_ioctl_data *data)
 989 {
 990         struct obd_device *obd = class_exp2obd(exp);
 991         struct echo_client_obd *ec = &obd->u.echo_client;
 992         struct obd_trans_info dummy_oti = { .oti_thread_id = -1 };
 993         struct ec_object *eco;
 994         int rc;
 995         ENTRY;
 996
 997         rc = echo_get_object(&eco, obd, &data->ioc_obdo1);
 998         if (rc)
 999                 RETURN(rc);
1000
1001         data->ioc_obdo1.o_valid &= ~OBD_MD_FLHANDLE;
1002         data->ioc_obdo1.o_valid |= OBD_MD_FLGROUP;
1003         data->ioc_obdo1.o_gr = FILTER_GROUP_ECHO;
1004
1005         switch((long)data->ioc_pbuf1) {
1006         case 1:
1007                 if (data->ioc_pbuf2 == NULL) { // NULL user data pointer
1008                         rc = echo_client_kbrw(obd, rw, &data->ioc_obdo1,
1009                                               eco->eco_lsm, data->ioc_offset,
1010                                               data->ioc_count, &dummy_oti);
1011                 } else {
1012 #ifdef __KERNEL__
1013                         rc = echo_client_ubrw(obd, rw, &data->ioc_obdo1,
1014                                               eco->eco_lsm, data->ioc_offset,
1015                                               data->ioc_count, data->ioc_pbuf2,
1016                                               &dummy_oti);
1017 #endif
1018                 }
1019                 break;
1020         case 2:
1021                 rc = echo_client_async_page(ec->ec_exp, rw, &data->ioc_obdo1,
1022                                            eco->eco_lsm, data->ioc_offset,
1023                                            data->ioc_count, data->ioc_plen1);
1024                 break;
1025         case 3:
1026                 rc = echo_client_prep_commit(ec->ec_exp, rw, &data->ioc_obdo1,
1027                                             eco->eco_lsm, data->ioc_offset,
1028                                             data->ioc_count, data->ioc_plen1,
1029                                             &dummy_oti);
1030                 break;
1031         default:
1032                 rc = -EINVAL;
1033         }
1034         echo_put_object(eco);
1035         RETURN(rc);
1036 }
1037
1038 static int
1039 echo_ldlm_callback (struct ldlm_lock *lock, struct ldlm_lock_desc *new,
1040                     void *data, int flag)
1041 {
1042         struct ec_object       *eco = (struct ec_object *)data;
1043         struct echo_client_obd *ec = &(eco->eco_device->u.echo_client);
1044         struct lustre_handle    lockh;
1045         struct list_head       *el;
1046         int                     found = 0;
1047         int                     rc;
1048
1049         ldlm_lock2handle (lock, &lockh);
1050
1051         /* #ifdef this out if we're not feeling paranoid */
1052         spin_lock (&ec->ec_lock);
1053         list_for_each (el, &ec->ec_objects) {
1054                 found = (eco == list_entry(el, struct ec_object,
1055                                            eco_obj_chain));
1056                 if (found)
1057                         break;
1058         }
1059         spin_unlock (&ec->ec_lock);
1060         LASSERT (found);
1061
1062         switch (flag) {
1063         case LDLM_CB_BLOCKING:
1064                 CDEBUG(D_INFO, "blocking callback on "LPX64", handle "LPX64"\n",
1065                        eco->eco_id, lockh.cookie);
1066                 rc = ldlm_cli_cancel (&lockh);
1067                 if (rc != ELDLM_OK)
1068                         CERROR ("ldlm_cli_cancel failed: %d\n", rc);
1069                 break;
1070
1071         case LDLM_CB_CANCELING:
1072                 CDEBUG(D_INFO, "cancel callback on "LPX64", handle "LPX64"\n",
1073                        eco->eco_id, lockh.cookie);
1074                 break;
1075
1076         default:
1077                 LBUG ();
1078         }
1079
1080         return (0);
1081 }
1082
1083 static int
1084 echo_client_enqueue(struct obd_export *exp, struct obdo *oa,
1085                     int mode, obd_off offset, obd_size nob)
1086 {
1087         struct obd_device      *obd = exp->exp_obd;
1088         struct echo_client_obd *ec = &obd->u.echo_client;
1089         struct lustre_handle   *ulh = obdo_handle (oa);
1090         struct obd_enqueue_info einfo = { 0 };
1091         struct obd_info oinfo = { { { 0 } } };
1092         struct ec_object       *eco;
1093         struct ec_lock         *ecl;
1094         int                     rc;
1095
1096         if (!(mode == LCK_PR || mode == LCK_PW))
1097                 return -EINVAL;
1098
1099         if ((offset & (CFS_PAGE_SIZE - 1)) != 0 ||
1100             (nob & (CFS_PAGE_SIZE - 1)) != 0)
1101                 return -EINVAL;
1102
1103         rc = echo_get_object (&eco, obd, oa);
1104         if (rc != 0)
1105                 return rc;
1106
1107         rc = -ENOMEM;
1108         OBD_ALLOC (ecl, sizeof (*ecl));
1109         if (ecl == NULL)
1110                 goto failed_0;
1111
1112         ecl->ecl_mode = mode;
1113         ecl->ecl_object = eco;
1114         ecl->ecl_policy.l_extent.start = offset;
1115         ecl->ecl_policy.l_extent.end =
1116                 (nob == 0) ? ((obd_off) -1) : (offset + nob - 1);
1117
1118         einfo.ei_type = LDLM_EXTENT;
1119         einfo.ei_mode = mode;
1120         einfo.ei_cb_bl = echo_ldlm_callback;
1121         einfo.ei_cb_cp = ldlm_completion_ast;
1122         einfo.ei_cb_gl = NULL;
1123         einfo.ei_cbdata = eco;
1124
1125         oinfo.oi_policy = ecl->ecl_policy;
1126         oinfo.oi_lockh = &ecl->ecl_lock_handle;
1127         oinfo.oi_md = eco->eco_lsm;
1128         rc = obd_enqueue(ec->ec_exp, &oinfo, &einfo);
1129         if (rc != 0)
1130                 goto failed_1;
1131
1132         CDEBUG(D_INFO, "enqueue handle "LPX64"\n", ecl->ecl_lock_handle.cookie);
1133
1134         /* NB ecl takes object ref from echo_get_object() above */
1135         spin_lock(&ec->ec_lock);
1136
1137         list_add(&ecl->ecl_exp_chain, &exp->exp_ec_data.eced_locks);
1138         ulh->cookie = ecl->ecl_cookie = ec->ec_unique++;
1139
1140         spin_unlock(&ec->ec_lock);
1141
1142         oa->o_valid |= OBD_MD_FLHANDLE;
1143         return 0;
1144
1145  failed_1:
1146         OBD_FREE (ecl, sizeof (*ecl));
1147  failed_0:
1148         echo_put_object (eco);
1149         return (rc);
1150 }
1151
1152 static int
1153 echo_client_cancel(struct obd_export *exp, struct obdo *oa)
1154 {
1155         struct obd_device      *obd = exp->exp_obd;
1156         struct echo_client_obd *ec = &obd->u.echo_client;
1157         struct lustre_handle   *ulh = obdo_handle (oa);
1158         struct ec_lock         *ecl = NULL;
1159         int                     found = 0;
1160         struct list_head       *el;
1161         int                     rc;
1162
1163         if ((oa->o_valid & OBD_MD_FLHANDLE) == 0)
1164                 return -EINVAL;
1165
1166         spin_lock (&ec->ec_lock);
1167
1168         list_for_each (el, &exp->exp_ec_data.eced_locks) {
1169                 ecl = list_entry (el, struct ec_lock, ecl_exp_chain);
1170                 found = (ecl->ecl_cookie == ulh->cookie);
1171                 if (found) {
1172                         list_del (&ecl->ecl_exp_chain);
1173                         break;
1174                 }
1175         }
1176
1177         spin_unlock (&ec->ec_lock);
1178
1179         if (!found)
1180                 return (-ENOENT);
1181
1182         rc = obd_cancel(ec->ec_exp, ecl->ecl_object->eco_lsm, ecl->ecl_mode,
1183                         &ecl->ecl_lock_handle);
1184
1185         echo_put_object (ecl->ecl_object);
1186         OBD_FREE (ecl, sizeof (*ecl));
1187
1188         return rc;
1189 }
1190
1191 static int
1192 echo_client_iocontrol(unsigned int cmd, struct obd_export *exp,
1193                       int len, void *karg, void *uarg)
1194 {
1195         struct obd_device      *obd;
1196         struct echo_client_obd *ec;
1197         struct ec_object       *eco;
1198         struct obd_ioctl_data  *data = karg;
1199         struct obd_trans_info   dummy_oti;
1200         struct oti_req_ack_lock *ack_lock;
1201         struct obdo            *oa;
1202         int                     rw = OBD_BRW_READ;
1203         int                     rc = 0;
1204         int                     i;
1205         ENTRY;
1206
1207         unlock_kernel();
1208
1209         memset(&dummy_oti, 0, sizeof(dummy_oti));
1210
1211         obd = exp->exp_obd;
1212         ec = &obd->u.echo_client;
1213
1214         switch (cmd) {
1215         case OBD_IOC_CREATE:                    /* may create echo object */
1216                 if (!capable (CAP_SYS_ADMIN))
1217                         GOTO (out, rc = -EPERM);
1218
1219                 rc = echo_create_object (obd, 1, &data->ioc_obdo1,
1220                                          data->ioc_pbuf1, data->ioc_plen1,
1221                                          &dummy_oti);
1222                 GOTO(out, rc);
1223
1224         case OBD_IOC_DESTROY:
1225                 if (!capable (CAP_SYS_ADMIN))
1226                         GOTO (out, rc = -EPERM);
1227
1228                 rc = echo_get_object (&eco, obd, &data->ioc_obdo1);
1229                 if (rc == 0) {
1230                         oa = &data->ioc_obdo1;
1231                         oa->o_gr = FILTER_GROUP_ECHO;
1232                         oa->o_valid |= OBD_MD_FLGROUP;
1233                         rc = obd_destroy(ec->ec_exp, oa, eco->eco_lsm,
1234                                          &dummy_oti, NULL);
1235                         if (rc == 0)
1236                                 eco->eco_deleted = 1;
1237                         echo_put_object(eco);
1238                 }
1239                 GOTO(out, rc);
1240
1241         case OBD_IOC_GETATTR:
1242                 rc = echo_get_object (&eco, obd, &data->ioc_obdo1);
1243                 if (rc == 0) {
1244                         struct obd_info oinfo = { { { 0 } } };
1245                         oinfo.oi_md = eco->eco_lsm;
1246                         oinfo.oi_oa = &data->ioc_obdo1;
1247                         rc = obd_getattr(ec->ec_exp, &oinfo);
1248                         echo_put_object(eco);
1249                 }
1250                 GOTO(out, rc);
1251
1252         case OBD_IOC_SETATTR:
1253                 if (!capable (CAP_SYS_ADMIN))
1254                         GOTO (out, rc = -EPERM);
1255
1256                 rc = echo_get_object (&eco, obd, &data->ioc_obdo1);
1257                 if (rc == 0) {
1258                         struct obd_info oinfo = { { { 0 } } };
1259                         oinfo.oi_oa = &data->ioc_obdo1;
1260                         oinfo.oi_md = eco->eco_lsm;
1261
1262                         rc = obd_setattr(ec->ec_exp, &oinfo, NULL);
1263                         echo_put_object(eco);
1264                 }
1265                 GOTO(out, rc);
1266
1267         case OBD_IOC_BRW_WRITE:
1268                 if (!capable (CAP_SYS_ADMIN))
1269                         GOTO (out, rc = -EPERM);
1270
1271                 rw = OBD_BRW_WRITE;
1272                 /* fall through */
1273         case OBD_IOC_BRW_READ:
1274                 rc = echo_client_brw_ioctl(rw, exp, data);
1275                 GOTO(out, rc);
1276
1277         case ECHO_IOC_GET_STRIPE:
1278                 rc = echo_get_object(&eco, obd, &data->ioc_obdo1);
1279                 if (rc == 0) {
1280                         rc = echo_copyout_lsm(eco->eco_lsm, data->ioc_pbuf1,
1281                                               data->ioc_plen1);
1282                         echo_put_object(eco);
1283                 }
1284                 GOTO(out, rc);
1285
1286         case ECHO_IOC_SET_STRIPE:
1287                 if (!capable (CAP_SYS_ADMIN))
1288                         GOTO (out, rc = -EPERM);
1289
1290                 if (data->ioc_pbuf1 == NULL) {  /* unset */
1291                         rc = echo_get_object(&eco, obd, &data->ioc_obdo1);
1292                         if (rc == 0) {
1293                                 eco->eco_deleted = 1;
1294                                 echo_put_object(eco);
1295                         }
1296                 } else {
1297                         rc = echo_create_object(obd, 0, &data->ioc_obdo1,
1298                                                 data->ioc_pbuf1,
1299                                                 data->ioc_plen1, &dummy_oti);
1300                 }
1301                 GOTO (out, rc);
1302
1303         case ECHO_IOC_ENQUEUE:
1304                 if (!capable (CAP_SYS_ADMIN))
1305                         GOTO (out, rc = -EPERM);
1306
1307                 rc = echo_client_enqueue(exp, &data->ioc_obdo1,
1308                                          data->ioc_conn1, /* lock mode */
1309                                    data->ioc_offset, data->ioc_count);/*extent*/
1310                 GOTO (out, rc);
1311
1312         case ECHO_IOC_CANCEL:
1313                 rc = echo_client_cancel(exp, &data->ioc_obdo1);
1314                 GOTO (out, rc);
1315
1316         default:
1317                 CERROR ("echo_ioctl(): unrecognised ioctl %#x\n", cmd);
1318                 GOTO (out, rc = -ENOTTY);
1319         }
1320
1321         EXIT;
1322  out:
1323
1324         /* XXX this should be in a helper also called by target_send_reply */
1325         for (ack_lock = dummy_oti.oti_ack_locks, i = 0; i < 4;
1326              i++, ack_lock++) {
1327                 if (!ack_lock->mode)
1328                         break;
1329                 ldlm_lock_decref(&ack_lock->lock, ack_lock->mode);
1330         }
1331
1332         lock_kernel();
1333
1334         return rc;
1335 }
1336
1337 static int echo_client_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
1338 {
1339         struct echo_client_obd *ec = &obddev->u.echo_client;
1340         struct obd_device *tgt;
1341         struct lustre_handle conn = {0, };
1342         struct obd_uuid echo_uuid = { "ECHO_UUID" };
1343         struct obd_connect_data *ocd = NULL;
1344         int rc;
1345         ENTRY;
1346
1347         if (lcfg->lcfg_bufcount < 2 || LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
1348                 CERROR("requires a TARGET OBD name\n");
1349                 RETURN(-EINVAL);
1350         }
1351
1352         tgt = class_name2obd(lustre_cfg_string(lcfg, 1));
1353         if (!tgt || !tgt->obd_attached || !tgt->obd_set_up) {
1354                 CERROR("device not attached or not set up (%s)\n",
1355                        lustre_cfg_string(lcfg, 1));
1356                 RETURN(-EINVAL);
1357         }
1358
1359         spin_lock_init (&ec->ec_lock);
1360         CFS_INIT_LIST_HEAD (&ec->ec_objects);
1361         ec->ec_unique = 0;
1362
1363         OBD_ALLOC(ocd, sizeof(*ocd));
1364         if (ocd == NULL) {
1365                 CERROR("Can't alloc ocd connecting to %s\n",
1366                        lustre_cfg_string(lcfg, 1));
1367                 return -ENOMEM;
1368         }
1369
1370         ocd->ocd_connect_flags = OBD_CONNECT_VERSION;
1371         ocd->ocd_version = LUSTRE_VERSION_CODE;
1372
1373         rc = obd_connect(NULL, &conn, tgt, &echo_uuid, ocd);
1374
1375         OBD_FREE(ocd, sizeof(*ocd));
1376
1377         if (rc != 0) {
1378                 CERROR("fail to connect to device %s\n",
1379                        lustre_cfg_string(lcfg, 1));
1380                 return (rc);
1381         }
1382         ec->ec_exp = class_conn2export(&conn);
1383
1384         RETURN(rc);
1385 }
1386
1387 static int echo_client_cleanup(struct obd_device *obddev)
1388 {
1389         struct list_head       *el;
1390         struct ec_object       *eco;
1391         struct echo_client_obd *ec = &obddev->u.echo_client;
1392         int rc;
1393         ENTRY;
1394
1395         if (!list_empty(&obddev->obd_exports)) {
1396                 CERROR("still has clients!\n");
1397                 RETURN(-EBUSY);
1398         }
1399
1400         /* XXX assuming sole access */
1401         while (!list_empty(&ec->ec_objects)) {
1402                 el = ec->ec_objects.next;
1403                 eco = list_entry(el, struct ec_object, eco_obj_chain);
1404
1405                 LASSERT(eco->eco_refcount == 0);
1406                 eco->eco_refcount = 1;
1407                 eco->eco_deleted = 1;
1408                 echo_put_object(eco);
1409         }
1410
1411         rc = obd_disconnect(ec->ec_exp);
1412         if (rc != 0)
1413                 CERROR("fail to disconnect device: %d\n", rc);
1414
1415         RETURN(rc);
1416 }
1417
1418 static int echo_client_connect(const struct lu_context *ctx,
1419                                struct lustre_handle *conn,
1420                                struct obd_device *src, struct obd_uuid *cluuid,
1421                                struct obd_connect_data *data)
1422 {
1423         struct obd_export *exp;
1424         int                rc;
1425
1426         ENTRY;
1427         rc = class_connect(conn, src, cluuid);
1428         if (rc == 0) {
1429                 exp = class_conn2export(conn);
1430                 CFS_INIT_LIST_HEAD(&exp->exp_ec_data.eced_locks);
1431                 class_export_put(exp);
1432         }
1433
1434         RETURN (rc);
1435 }
1436
1437 static int echo_client_disconnect(struct obd_export *exp)
1438 {
1439         struct obd_device      *obd;
1440         struct echo_client_obd *ec;
1441         struct ec_lock         *ecl;
1442         int                     rc;
1443         ENTRY;
1444
1445         if (exp == NULL)
1446                 GOTO(out, rc = -EINVAL);
1447
1448         obd = exp->exp_obd;
1449         ec = &obd->u.echo_client;
1450
1451         /* no more contention on export's lock list */
1452         while (!list_empty (&exp->exp_ec_data.eced_locks)) {
1453                 ecl = list_entry (exp->exp_ec_data.eced_locks.next,
1454                                   struct ec_lock, ecl_exp_chain);
1455                 list_del (&ecl->ecl_exp_chain);
1456
1457                 rc = obd_cancel(ec->ec_exp, ecl->ecl_object->eco_lsm,
1458                                  ecl->ecl_mode, &ecl->ecl_lock_handle);
1459
1460                 CDEBUG (D_INFO, "Cancel lock on object "LPX64" on disconnect "
1461                         "(%d)\n", ecl->ecl_object->eco_id, rc);
1462
1463                 echo_put_object (ecl->ecl_object);
1464                 OBD_FREE (ecl, sizeof (*ecl));
1465         }
1466
1467         rc = class_disconnect(exp);
1468         GOTO(out, rc);
1469  out:
1470         return rc;
1471 }
1472
1473 static struct obd_ops echo_obd_ops = {
1474         .o_owner       = THIS_MODULE,
1475         .o_setup       = echo_client_setup,
1476         .o_cleanup     = echo_client_cleanup,
1477         .o_iocontrol   = echo_client_iocontrol,
1478         .o_connect     = echo_client_connect,
1479         .o_disconnect  = echo_client_disconnect
1480 };
1481
1482 int echo_client_init(void)
1483 {
1484         struct lprocfs_static_vars lvars;
1485
1486         lprocfs_init_vars(echo, &lvars);
1487         return class_register_type(&echo_obd_ops, NULL, lvars.module_vars,
1488                                    LUSTRE_ECHO_CLIENT_NAME, NULL);
1489 }
1490
1491 void echo_client_exit(void)
1492 {
1493         class_unregister_type(LUSTRE_ECHO_CLIENT_NAME);
1494 }