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 Lustre, http://www.lustre.org.
   7  *
   8  *   Lustre is free software; you can redistribute it and/or
   9  *   modify it under the terms of version 2 of the GNU General Public
  10  *   License as published by the Free Software Foundation.
  11  *
  12  *   Lustre is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with Lustre; if not, write to the Free Software
  19  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #define DEBUG_SUBSYSTEM S_ECHO
  23 #ifdef __KERNEL__
  24 #include <linux/version.h>
  25 #include <linux/module.h>
  26 #include <linux/fs.h>
  27 #include <linux/completion.h>
  28 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
  29 #include <linux/iobuf.h>
  30 #endif
  31 #include <asm/div64.h>
  32 #include <linux/smp_lock.h>
  33 #else
  34 #include <liblustre.h>
  35 #endif
  36
  37 #include <linux/obd.h>
  38 #include <linux/obd_support.h>
  39 #include <linux/obd_class.h>
  40 #include <linux/obd_echo.h>
  41 #include <linux/lustre_debug.h>
  42 #include <linux/lprocfs_status.h>
  43
  44 static obd_id last_object_id;
  45
  46 #if 0
  47 static void
  48 echo_printk_object (char *msg, struct ec_object *eco)
  49 {
  50         struct lov_stripe_md *lsm = eco->eco_lsm;
  51         int                   i;
  52
  53         printk (KERN_INFO "Lustre: %s: object %p: "LPX64", refs %d%s: "LPX64
  54                 "=%u!%u\n", msg, eco, eco->eco_id, eco->eco_refcount,
  55                 eco->eco_deleted ? "(deleted) " : "",
  56                 lsm->lsm_object_id, lsm->lsm_stripe_size,
  57                 lsm->lsm_stripe_count);
  58
  59         for (i = 0; i < lsm->lsm_stripe_count; i++)
  60                 printk (KERN_INFO "Lustre:   @%2u:"LPX64"\n",
  61                         lsm->lsm_oinfo[i].loi_ost_idx,
  62                         lsm->lsm_oinfo[i].loi_id);
  63 }
  64 #endif
  65
  66 static struct ec_object *
  67 echo_find_object_locked (struct obd_device *obd, obd_id id)
  68 {
  69         struct echo_client_obd *ec = &obd->u.echo_client;
  70         struct ec_object       *eco = NULL;
  71         struct list_head       *el;
  72
  73         list_for_each (el, &ec->ec_objects) {
  74                 eco = list_entry (el, struct ec_object, eco_obj_chain);
  75
  76                 if (eco->eco_id == id)
  77                         return (eco);
  78         }
  79         return (NULL);
  80 }
  81
  82 static int
  83 echo_copyout_lsm (struct lov_stripe_md *lsm, void *ulsm, int ulsm_nob)
  84 {
  85         int nob;
  86
  87         nob = offsetof (struct lov_stripe_md, lsm_oinfo[lsm->lsm_stripe_count]);
  88         if (nob > ulsm_nob)
  89                 return (-EINVAL);
  90
  91         if (copy_to_user (ulsm, lsm, nob))
  92                 return (-EFAULT);
  93
  94         return (0);
  95 }
  96
  97 static int
  98 echo_copyin_lsm (struct obd_device *obd, struct lov_stripe_md *lsm,
  99                  void *ulsm, int ulsm_nob)
 100 {
 101         struct echo_client_obd *ec = &obd->u.echo_client;
 102         int                     nob;
 103
 104         if (ulsm_nob < sizeof (*lsm))
 105                 return (-EINVAL);
 106
 107         if (copy_from_user (lsm, ulsm, sizeof (*lsm)))
 108                 return (-EFAULT);
 109
 110         nob = lsm->lsm_stripe_count * sizeof (lsm->lsm_oinfo[0]);
 111
 112         if (ulsm_nob < nob ||
 113             lsm->lsm_stripe_count > ec->ec_nstripes ||
 114             lsm->lsm_magic != LOV_MAGIC ||
 115             (lsm->lsm_stripe_size & (PAGE_SIZE - 1)) != 0 ||
 116             ((__u64)lsm->lsm_stripe_size * lsm->lsm_stripe_count > ~0UL))
 117                 return (-EINVAL);
 118
 119         if (copy_from_user(lsm->lsm_oinfo,
 120                            ((struct lov_stripe_md *)ulsm)->lsm_oinfo, nob))
 121                 return (-EFAULT);
 122
 123         return (0);
 124 }
 125
 126 static struct ec_object *
 127 echo_allocate_object (struct obd_device *obd)
 128 {
 129         struct echo_client_obd *ec = &obd->u.echo_client;
 130         struct ec_object       *eco;
 131         int rc;
 132
 133         OBD_ALLOC(eco, sizeof (*eco));
 134         if (eco == NULL)
 135                 return NULL;
 136
 137         rc = obd_alloc_memmd(ec->ec_exp, &eco->eco_lsm);
 138         if (rc < 0) {
 139                 OBD_FREE(eco, sizeof (*eco));
 140                 return NULL;
 141         }
 142
 143         eco->eco_device = obd;
 144         eco->eco_deleted = 0;
 145         eco->eco_refcount = 0;
 146         eco->eco_lsm->lsm_magic = LOV_MAGIC;
 147         /* leave stripe count 0 by default */
 148
 149         return (eco);
 150 }
 151
 152 static void
 153 echo_free_object (struct ec_object *eco)
 154 {
 155         struct obd_device      *obd = eco->eco_device;
 156         struct echo_client_obd *ec = &obd->u.echo_client;
 157
 158         LASSERT (eco->eco_refcount == 0);
 159         obd_free_memmd(ec->ec_exp, &eco->eco_lsm);
 160         OBD_FREE (eco, sizeof (*eco));
 161 }
 162
 163 static int echo_create_object(struct obd_device *obd, int on_target,
 164                               struct obdo *oa, void *ulsm, int ulsm_nob,
 165                               struct obd_trans_info *oti)
 166 {
 167         struct echo_client_obd *ec = &obd->u.echo_client;
 168         struct ec_object       *eco2;
 169         struct ec_object       *eco;
 170         struct lov_stripe_md   *lsm;
 171         int                     rc;
 172         int                     i, idx;
 173
 174         if ((oa->o_valid & OBD_MD_FLID) == 0 && /* no obj id */
 175             (on_target ||                       /* set_stripe */
 176              ec->ec_nstripes != 0)) {           /* LOV */
 177                 CERROR ("No valid oid\n");
 178                 return (-EINVAL);
 179         }
 180
 181         if (ulsm != NULL) {
 182                 eco = echo_allocate_object (obd);
 183                 if (eco == NULL)
 184                         return (-ENOMEM);
 185
 186                 lsm = eco->eco_lsm;
 187
 188                 rc = echo_copyin_lsm (obd, lsm, ulsm, ulsm_nob);
 189                 if (rc != 0)
 190                         goto failed;
 191
 192                 /* setup object ID here for !on_target and LOV hint */
 193                 if ((oa->o_valid & OBD_MD_FLID) != 0)
 194                         eco->eco_id = lsm->lsm_object_id = oa->o_id;
 195
 196                 if (lsm->lsm_stripe_count == 0)
 197                         lsm->lsm_stripe_count = ec->ec_nstripes;
 198
 199                 if (lsm->lsm_stripe_size == 0)
 200                         lsm->lsm_stripe_size = PAGE_SIZE;
 201
 202                 idx = ll_insecure_random_int();
 203
 204                 /* setup stripes: indices + default ids if required */
 205                 for (i = 0; i < lsm->lsm_stripe_count; i++) {
 206                         if (lsm->lsm_oinfo[i].loi_id == 0)
 207                                 lsm->lsm_oinfo[i].loi_id = lsm->lsm_object_id;
 208
 209                         lsm->lsm_oinfo[i].loi_ost_idx =
 210                                 (idx + i) % ec->ec_nstripes;
 211                 }
 212         } else {
 213                 OBD_ALLOC(eco, sizeof(*eco));
 214                 eco->eco_device = obd;
 215                 lsm = NULL;
 216         }
 217
 218         if (oa->o_id == 0)
 219                 oa->o_id = ++last_object_id;
 220
 221         if (on_target) {
 222                 /* XXX get some filter group constants */
 223                 oa->o_gr = 2;
 224                 oa->o_valid |= OBD_MD_FLGROUP;
 225                 rc = obd_create(ec->ec_exp, oa, &lsm, oti);
 226                 if (rc != 0)
 227                         goto failed;
 228
 229                 /* See what object ID we were given */
 230                 eco->eco_id = oa->o_id = lsm->lsm_object_id;
 231                 oa->o_valid |= OBD_MD_FLID;
 232
 233                 LASSERT(eco->eco_lsm == NULL || eco->eco_lsm == lsm);
 234                 eco->eco_lsm = lsm;
 235         }
 236
 237         spin_lock (&ec->ec_lock);
 238
 239         eco2 = echo_find_object_locked (obd, oa->o_id);
 240         if (eco2 != NULL) {                     /* conflict */
 241                 spin_unlock (&ec->ec_lock);
 242
 243                 CERROR ("Can't create object id "LPX64": id already exists%s\n",
 244                         oa->o_id, on_target ? " (undoing create)" : "");
 245
 246                 if (on_target)
 247                         obd_destroy(ec->ec_exp, oa, lsm, oti);
 248
 249                 rc = -EEXIST;
 250                 goto failed;
 251         }
 252
 253         list_add (&eco->eco_obj_chain, &ec->ec_objects);
 254         spin_unlock (&ec->ec_lock);
 255         CDEBUG (D_INFO,
 256                 "created %p: "LPX64"=%u#%u@%u refs %d del %d\n",
 257                 eco, eco->eco_id,
 258                 eco->eco_lsm->lsm_stripe_size,
 259                 eco->eco_lsm->lsm_stripe_count,
 260                 eco->eco_lsm->lsm_oinfo[0].loi_ost_idx,
 261                 eco->eco_refcount, eco->eco_deleted);
 262         return (0);
 263
 264  failed:
 265         echo_free_object (eco);
 266         return (rc);
 267 }
 268
 269 static int
 270 echo_get_object (struct ec_object **ecop, struct obd_device *obd,
 271                  struct obdo *oa)
 272 {
 273         struct echo_client_obd *ec = &obd->u.echo_client;
 274         struct ec_object       *eco;
 275         struct ec_object       *eco2;
 276         int                     rc;
 277
 278         if ((oa->o_valid & OBD_MD_FLID) == 0 ||
 279             oa->o_id == 0)                      /* disallow use of object id 0 */
 280         {
 281                 CERROR ("No valid oid\n");
 282                 return (-EINVAL);
 283         }
 284
 285         spin_lock (&ec->ec_lock);
 286         eco = echo_find_object_locked (obd, oa->o_id);
 287         if (eco != NULL) {
 288                 if (eco->eco_deleted)           /* being deleted */
 289                         return (-EAGAIN);       /* (see comment in cleanup) */
 290
 291                 eco->eco_refcount++;
 292                 spin_unlock (&ec->ec_lock);
 293                 *ecop = eco;
 294                 CDEBUG (D_INFO,
 295                         "found %p: "LPX64"=%u#%u@%u refs %d del %d\n",
 296                         eco, eco->eco_id,
 297                         eco->eco_lsm->lsm_stripe_size,
 298                         eco->eco_lsm->lsm_stripe_count,
 299                         eco->eco_lsm->lsm_oinfo[0].loi_ost_idx,
 300                         eco->eco_refcount, eco->eco_deleted);
 301                 return (0);
 302         }
 303         spin_unlock (&ec->ec_lock);
 304
 305         if (ec->ec_nstripes != 0)               /* striping required */
 306                 return (-ENOENT);
 307
 308         eco = echo_allocate_object (obd);
 309         if (eco == NULL)
 310                 return (-ENOMEM);
 311
 312         eco->eco_id = eco->eco_lsm->lsm_object_id = oa->o_id;
 313
 314         spin_lock (&ec->ec_lock);
 315
 316         eco2 = echo_find_object_locked (obd, oa->o_id);
 317         if (eco2 == NULL) {                     /* didn't race */
 318                 list_add (&eco->eco_obj_chain, &ec->ec_objects);
 319                 spin_unlock (&ec->ec_lock);
 320                 eco->eco_refcount = 1;
 321                 *ecop = eco;
 322                 CDEBUG (D_INFO,
 323                         "created %p: "LPX64"=%u#%u@%d refs %d del %d\n",
 324                         eco, eco->eco_id,
 325                         eco->eco_lsm->lsm_stripe_size,
 326                         eco->eco_lsm->lsm_stripe_count,
 327                         eco->eco_lsm->lsm_oinfo[0].loi_ost_idx,
 328                         eco->eco_refcount, eco->eco_deleted);
 329                 return (0);
 330         }
 331
 332         if (eco2->eco_deleted)
 333                 rc = -EAGAIN;                   /* lose race */
 334         else {
 335                 eco2->eco_refcount++;           /* take existing */
 336                 *ecop = eco2;
 337                 rc = 0;
 338                 LASSERT (eco2->eco_id == eco2->eco_lsm->lsm_object_id);
 339                 CDEBUG (D_INFO,
 340                         "found(2) %p: "LPX64"=%u#%u@%d refs %d del %d\n",
 341                         eco2, eco2->eco_id,
 342                         eco2->eco_lsm->lsm_stripe_size,
 343                         eco2->eco_lsm->lsm_stripe_count,
 344                         eco2->eco_lsm->lsm_oinfo[0].loi_ost_idx,
 345                         eco2->eco_refcount, eco2->eco_deleted);
 346         }
 347
 348         spin_unlock (&ec->ec_lock);
 349
 350         echo_free_object (eco);
 351         return (rc);
 352 }
 353
 354 static void
 355 echo_put_object (struct ec_object *eco)
 356 {
 357         struct obd_device      *obd = eco->eco_device;
 358         struct echo_client_obd *ec = &obd->u.echo_client;
 359
 360         /* Release caller's ref on the object.
 361          * delete => mark for deletion when last ref goes
 362          */
 363
 364         spin_lock (&ec->ec_lock);
 365
 366         eco->eco_refcount--;
 367         LASSERT (eco->eco_refcount >= 0);
 368
 369         CDEBUG(D_INFO, "put %p: "LPX64"=%u#%u@%d refs %d del %d\n",
 370                eco, eco->eco_id,
 371                eco->eco_lsm->lsm_stripe_size,
 372                eco->eco_lsm->lsm_stripe_count,
 373                eco->eco_lsm->lsm_oinfo[0].loi_ost_idx,
 374                eco->eco_refcount, eco->eco_deleted);
 375
 376         if (eco->eco_refcount != 0 || !eco->eco_deleted) {
 377                 spin_unlock (&ec->ec_lock);
 378                 return;
 379         }
 380
 381         spin_unlock (&ec->ec_lock);
 382
 383         /* NB leave obj in the object list.  We must prevent anyone from
 384          * attempting to enqueue on this object number until we can be
 385          * sure there will be no more lock callbacks.
 386          */
 387         obd_cancel_unused(ec->ec_exp, eco->eco_lsm, 0, NULL);
 388
 389         /* now we can let it go */
 390         spin_lock (&ec->ec_lock);
 391         list_del (&eco->eco_obj_chain);
 392         spin_unlock (&ec->ec_lock);
 393
 394         LASSERT (eco->eco_refcount == 0);
 395
 396         echo_free_object (eco);
 397 }
 398
 399 static void
 400 echo_get_stripe_off_id (struct lov_stripe_md *lsm, obd_off *offp, obd_id *idp)
 401 {
 402         unsigned long stripe_count;
 403         unsigned long stripe_size;
 404         unsigned long width;
 405         unsigned long woffset;
 406         int           stripe_index;
 407         obd_off       offset;
 408
 409         if (lsm->lsm_stripe_count <= 1)
 410                 return;
 411
 412         offset       = *offp;
 413         stripe_size  = lsm->lsm_stripe_size;
 414         stripe_count = lsm->lsm_stripe_count;
 415
 416         /* width = # bytes in all stripes */
 417         width = stripe_size * stripe_count;
 418
 419         /* woffset = offset within a width; offset = whole number of widths */
 420         woffset = do_div (offset, width);
 421
 422         stripe_index = woffset / stripe_size;
 423
 424         *idp = lsm->lsm_oinfo[stripe_index].loi_id;
 425         *offp = offset * stripe_size + woffset % stripe_size;
 426 }
 427
 428 static void
 429 echo_client_page_debug_setup(struct lov_stripe_md *lsm,
 430                              struct page *page, int rw, obd_id id,
 431                              obd_off offset, obd_off count)
 432 {
 433         char    *addr;
 434         obd_off  stripe_off;
 435         obd_id   stripe_id;
 436         int      delta;
 437
 438         /* no partial pages on the client */
 439         LASSERT(count == PAGE_SIZE);
 440
 441         addr = kmap(page);
 442
 443         for (delta = 0; delta < PAGE_SIZE; delta += OBD_ECHO_BLOCK_SIZE) {
 444                 if (rw == OBD_BRW_WRITE) {
 445                         stripe_off = offset + delta;
 446                         stripe_id = id;
 447                         echo_get_stripe_off_id(lsm, &stripe_off, &stripe_id);
 448                 } else {
 449                         stripe_off = 0xdeadbeef00c0ffeeULL;
 450                         stripe_id = 0xdeadbeef00c0ffeeULL;
 451                 }
 452                 block_debug_setup(addr + delta, OBD_ECHO_BLOCK_SIZE,
 453                                   stripe_off, stripe_id);
 454         }
 455
 456         kunmap(page);
 457 }
 458
 459 static int
 460 echo_client_page_debug_check(struct lov_stripe_md *lsm,
 461                              struct page *page, obd_id id,
 462                              obd_off offset, obd_off count)
 463 {
 464         obd_off stripe_off;
 465         obd_id  stripe_id;
 466         char   *addr;
 467         int     delta;
 468         int     rc;
 469         int     rc2;
 470
 471         /* no partial pages on the client */
 472         LASSERT(count == PAGE_SIZE);
 473
 474         addr = kmap(page);
 475
 476         for (rc = delta = 0; delta < PAGE_SIZE; delta += OBD_ECHO_BLOCK_SIZE) {
 477                 stripe_off = offset + delta;
 478                 stripe_id = id;
 479                 echo_get_stripe_off_id (lsm, &stripe_off, &stripe_id);
 480
 481                 rc2 = block_debug_check("test_brw",
 482                                         addr + delta, OBD_ECHO_BLOCK_SIZE,
 483                                         stripe_off, stripe_id);
 484                 if (rc2 != 0)
 485                         rc = rc2;
 486         }
 487
 488         kunmap(page);
 489         return rc;
 490 }
 491
 492 static int echo_client_kbrw(struct obd_device *obd, int rw, struct obdo *oa,
 493                             struct lov_stripe_md *lsm, obd_off offset,
 494                             obd_size count, struct obd_trans_info *oti)
 495 {
 496         struct echo_client_obd *ec = &obd->u.echo_client;
 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) ? GFP_KERNEL : GFP_HIGHUSER;
 511
 512         LASSERT(rw == OBD_BRW_WRITE || rw == OBD_BRW_READ);
 513
 514         if (count <= 0 ||
 515             (count & (PAGE_SIZE - 1)) != 0 ||
 516             (lsm != NULL &&
 517              lsm->lsm_object_id != oa->o_id))
 518                 return (-EINVAL);
 519
 520         /* XXX think again with misaligned I/O */
 521         npages = count >> 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 += PAGE_SIZE) {
 530
 531                 LASSERT (pgp->pg == NULL);      /* for cleanup */
 532
 533                 rc = -ENOMEM;
 534                 pgp->pg = alloc_pages (gfp_mask, 0);
 535                 if (pgp->pg == NULL)
 536                         goto out;
 537
 538                 pgp->count = 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         rc = obd_brw(rw, ec->ec_exp, oa, lsm, npages, pga, oti);
 548
 549  out:
 550         if (rc != 0 || rw != OBD_BRW_READ)
 551                 verify = 0;
 552
 553         for (i = 0, pgp = pga; i < npages; i++, pgp++) {
 554                 if (pgp->pg == NULL)
 555                         continue;
 556
 557                 if (verify) {
 558                         int vrc;
 559                         vrc = echo_client_page_debug_check(lsm, pgp->pg, oa->o_id,
 560                                                            pgp->off, pgp->count);
 561                         if (vrc != 0 && rc == 0)
 562                                 rc = vrc;
 563                 }
 564                 __free_pages(pgp->pg, 0);
 565         }
 566         OBD_FREE(pga, npages * sizeof(*pga));
 567         return (rc);
 568 }
 569
 570 #ifdef __KERNEL__
 571 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 572 static int echo_client_ubrw(struct obd_device *obd, int rw,
 573                             struct obdo *oa, struct lov_stripe_md *lsm,
 574                             obd_off offset, obd_size count, char *buffer,
 575                             struct obd_trans_info *oti)
 576 {
 577         struct echo_client_obd *ec = &obd->u.echo_client;
 578         obd_count               npages;
 579         struct brw_page        *pga;
 580         struct brw_page        *pgp;
 581         obd_off                 off;
 582         struct kiobuf          *kiobuf;
 583         int                     i;
 584         int                     rc;
 585
 586         LASSERT (rw == OBD_BRW_WRITE ||
 587                  rw == OBD_BRW_READ);
 588
 589         /* NB: for now, only whole pages, page aligned */
 590
 591         if (count <= 0 ||
 592             ((long)buffer & (PAGE_SIZE - 1)) != 0 ||
 593             (count & (PAGE_SIZE - 1)) != 0 ||
 594             (lsm != NULL && lsm->lsm_object_id != oa->o_id))
 595                 return (-EINVAL);
 596
 597         /* XXX think again with misaligned I/O */
 598         npages = count >> PAGE_SHIFT;
 599
 600         OBD_ALLOC(pga, npages * sizeof(*pga));
 601         if (pga == NULL)
 602                 return (-ENOMEM);
 603
 604         rc = alloc_kiovec (1, &kiobuf);
 605         if (rc != 0)
 606                 goto out_1;
 607
 608         rc = map_user_kiobuf ((rw == OBD_BRW_READ) ? READ : WRITE,
 609                               kiobuf, (unsigned long)buffer, count);
 610         if (rc != 0)
 611                 goto out_2;
 612
 613         LASSERT (kiobuf->offset == 0);
 614         LASSERT (kiobuf->nr_pages == npages);
 615
 616         for (i = 0, off = offset, pgp = pga;
 617              i < npages;
 618              i++, off += PAGE_SIZE, pgp++) {
 619                 pgp->off = off;
 620                 pgp->pg = kiobuf->maplist[i];
 621                 pgp->count = PAGE_SIZE;
 622                 pgp->flag = 0;
 623         }
 624
 625         rc = obd_brw(rw, ec->ec_exp, oa, lsm, npages, pga, oti);
 626
 627         //        if (rw == OBD_BRW_READ)
 628         //                mark_dirty_kiobuf (kiobuf, count);
 629
 630         unmap_kiobuf (kiobuf);
 631  out_2:
 632         free_kiovec (1, &kiobuf);
 633  out_1:
 634         OBD_FREE(pga, npages * sizeof(*pga));
 635         return (rc);
 636 }
 637 #else
 638 static int echo_client_ubrw(struct obd_device *obd, int rw,
 639                             struct obdo *oa, struct lov_stripe_md *lsm,
 640                             obd_off offset, obd_size count, char *buffer,
 641                             struct obd_trans_info *oti)
 642 {
 643 #warning "echo_client_ubrw() needs to be ported on 2.6 yet"
 644         LBUG();
 645         return 0;
 646 }
 647 #endif
 648 #endif
 649
 650 struct echo_async_state;
 651
 652 #define EAP_MAGIC 79277927
 653 struct echo_async_page {
 654         int                     eap_magic;
 655         struct page             *eap_page;
 656         void                    *eap_cookie;
 657         obd_off                 eap_off;
 658         struct echo_async_state *eap_eas;
 659         struct list_head        eap_item;
 660 };
 661
 662 #define EAP_FROM_COOKIE(c)                                                      \
 663         (LASSERT(((struct echo_async_page *)(c))->eap_magic == EAP_MAGIC),      \
 664          (struct echo_async_page *)(c))
 665
 666 struct echo_async_state {
 667         spinlock_t              eas_lock;
 668         obd_off                 eas_next_offset;
 669         obd_off                 eas_end_offset;
 670         int                     eas_in_flight;
 671         int                     eas_rc;
 672         wait_queue_head_t       eas_waitq;
 673         struct list_head        eas_avail;
 674         struct obdo             eas_oa;
 675         struct lov_stripe_md    *eas_lsm;
 676 };
 677
 678 static int eas_should_wake(struct echo_async_state *eas)
 679 {
 680         unsigned long flags;
 681         int rc = 0;
 682         spin_lock_irqsave(&eas->eas_lock, flags);
 683         if (eas->eas_rc == 0 && !list_empty(&eas->eas_avail))
 684             rc = 1;
 685         spin_unlock_irqrestore(&eas->eas_lock, flags);
 686         return rc;
 687 };
 688
 689 static int ec_ap_make_ready(void *data, int cmd)
 690 {
 691         /* our pages are issued ready */
 692         LBUG();
 693         return 0;
 694 }
 695 static int ec_ap_refresh_count(void *data, int cmd)
 696 {
 697         /* our pages are issued with a stable count */
 698         LBUG();
 699         return PAGE_SIZE;
 700 }
 701 static void ec_ap_fill_obdo(void *data, int cmd, struct obdo *oa)
 702 {
 703         struct echo_async_page *eap = EAP_FROM_COOKIE(data);
 704
 705         memcpy(oa, &eap->eap_eas->eas_oa, sizeof(*oa));
 706 }
 707
 708 static void ec_ap_completion(void *data, int cmd, struct obdo *oa, int rc)
 709 {
 710         struct echo_async_page *eap = EAP_FROM_COOKIE(data);
 711         struct echo_async_state *eas;
 712         unsigned long flags;
 713
 714         eas = eap->eap_eas;
 715
 716         if (cmd == OBD_BRW_READ &&
 717             eas->eas_oa.o_id != ECHO_PERSISTENT_OBJID &&
 718             (eas->eas_oa.o_valid & OBD_MD_FLFLAGS) != 0 &&
 719             (eas->eas_oa.o_flags & OBD_FL_DEBUG_CHECK) != 0)
 720                 echo_client_page_debug_check(eas->eas_lsm, eap->eap_page,
 721                                              eas->eas_oa.o_id, eap->eap_off,
 722                                              PAGE_SIZE);
 723
 724         spin_lock_irqsave(&eas->eas_lock, flags);
 725         if (rc && !eas->eas_rc)
 726                 eas->eas_rc = rc;
 727         eas->eas_in_flight--;
 728         list_add(&eap->eap_item, &eas->eas_avail);
 729         wake_up(&eas->eas_waitq);
 730         spin_unlock_irqrestore(&eas->eas_lock, flags);
 731 }
 732
 733 static struct obd_async_page_ops ec_async_page_ops = {
 734         .ap_make_ready =        ec_ap_make_ready,
 735         .ap_refresh_count =     ec_ap_refresh_count,
 736         .ap_fill_obdo =         ec_ap_fill_obdo,
 737         .ap_completion =        ec_ap_completion,
 738 };
 739
 740 static int echo_client_async_page(struct obd_export *exp, int rw,
 741                                    struct obdo *oa, struct lov_stripe_md *lsm,
 742                                    obd_off offset, obd_size count,
 743                                    obd_size batching)
 744 {
 745         obd_count npages, i;
 746         struct echo_async_page *eap;
 747         struct echo_async_state eas;
 748         struct list_head *pos, *n;
 749         int rc = 0;
 750         unsigned long flags;
 751         LIST_HEAD(pages);
 752 #if 0
 753         int                     verify;
 754         int                     gfp_mask;
 755
 756         verify = ((oa->o_id) != ECHO_PERSISTENT_OBJID &&
 757                   (oa->o_valid & OBD_MD_FLFLAGS) != 0 &&
 758                   (oa->o_flags & OBD_FL_DEBUG_CHECK) != 0);
 759
 760         gfp_mask = ((oa->o_id & 2) == 0) ? GFP_KERNEL : GFP_HIGHUSER;
 761 #endif
 762
 763         LASSERT(rw == OBD_BRW_WRITE || rw == OBD_BRW_READ);
 764
 765         if (count <= 0 ||
 766             (count & (PAGE_SIZE - 1)) != 0 ||
 767             (lsm != NULL &&
 768              lsm->lsm_object_id != oa->o_id))
 769                 return (-EINVAL);
 770
 771         /* XXX think again with misaligned I/O */
 772         npages = batching >> PAGE_SHIFT;
 773
 774         memcpy(&eas.eas_oa, oa, sizeof(*oa));
 775         eas.eas_next_offset = offset;
 776         eas.eas_end_offset = offset + count;
 777         spin_lock_init(&eas.eas_lock);
 778         init_waitqueue_head(&eas.eas_waitq);
 779         eas.eas_in_flight = 0;
 780         eas.eas_rc = 0;
 781         eas.eas_lsm = lsm;
 782         INIT_LIST_HEAD(&eas.eas_avail);
 783
 784         /* prepare the group of pages that we're going to be keeping
 785          * in flight */
 786         for (i = 0; i < npages; i++) {
 787                 struct page *page = alloc_page(GFP_KERNEL);
 788                 if (page == NULL)
 789                         GOTO(out, rc = -ENOMEM);
 790
 791                 page->private = 0;
 792                 list_add_tail(&PAGE_LIST(page), &pages);
 793
 794                 OBD_ALLOC(eap, sizeof(*eap));
 795                 if (eap == NULL)
 796                         GOTO(out, rc = -ENOMEM);
 797
 798                 eap->eap_magic = EAP_MAGIC;
 799                 eap->eap_page = page;
 800                 eap->eap_eas = &eas;
 801                 page->private = (unsigned long)eap;
 802                 list_add_tail(&eap->eap_item, &eas.eas_avail);
 803         }
 804
 805         /* first we spin queueing io and being woken by its completion */
 806         spin_lock_irqsave(&eas.eas_lock, flags);
 807         for(;;) {
 808                 int rc;
 809
 810                 /* sleep until we have a page to send */
 811                 spin_unlock_irqrestore(&eas.eas_lock, flags);
 812                 rc = wait_event_interruptible(eas.eas_waitq,
 813                                               eas_should_wake(&eas));
 814                 spin_lock_irqsave(&eas.eas_lock, flags);
 815                 if (rc && !eas.eas_rc)
 816                         eas.eas_rc = rc;
 817                 if (eas.eas_rc)
 818                         break;
 819                 if (list_empty(&eas.eas_avail))
 820                         continue;
 821                 eap = list_entry(eas.eas_avail.next, struct echo_async_page,
 822                                  eap_item);
 823                 list_del(&eap->eap_item);
 824                 spin_unlock_irqrestore(&eas.eas_lock, flags);
 825
 826                 /* unbind the eap from its old page offset */
 827                 if (eap->eap_cookie != NULL) {
 828                         obd_teardown_async_page(exp, lsm, NULL,
 829                                                 eap->eap_cookie);
 830                         eap->eap_cookie = NULL;
 831                 }
 832
 833                 eas.eas_next_offset += PAGE_SIZE;
 834                 eap->eap_off = eas.eas_next_offset;
 835
 836                 rc = obd_prep_async_page(exp, lsm, NULL, eap->eap_page,
 837                                          eap->eap_off, &ec_async_page_ops,
 838                                          eap, &eap->eap_cookie);
 839                 if (rc) {
 840                         spin_lock_irqsave(&eas.eas_lock, flags);
 841                         eas.eas_rc = rc;
 842                         break;
 843                 }
 844
 845                 if (oa->o_id != ECHO_PERSISTENT_OBJID &&
 846                     (oa->o_valid & OBD_MD_FLFLAGS) != 0 &&
 847                     (oa->o_flags & OBD_FL_DEBUG_CHECK) != 0)
 848                         echo_client_page_debug_setup(lsm, eap->eap_page, rw,
 849                                                      oa->o_id,
 850                                                      eap->eap_off, PAGE_SIZE);
 851
 852                 /* always asserts urgent, which isn't quite right */
 853                 rc = obd_queue_async_io(exp, lsm, NULL, eap->eap_cookie,
 854                                         rw, 0, PAGE_SIZE, 0,
 855                                         ASYNC_READY | ASYNC_URGENT |
 856                                         ASYNC_COUNT_STABLE);
 857                 spin_lock_irqsave(&eas.eas_lock, flags);
 858                 if (rc && !eas.eas_rc) {
 859                         eas.eas_rc = rc;
 860                         break;
 861                 }
 862                 eas.eas_in_flight++;
 863                 if (eas.eas_next_offset == eas.eas_end_offset)
 864                         break;
 865         }
 866
 867         /* still hold the eas_lock here.. */
 868
 869         /* now we just spin waiting for all the rpcs to complete */
 870         while(eas.eas_in_flight) {
 871                 spin_unlock_irqrestore(&eas.eas_lock, flags);
 872                 wait_event_interruptible(eas.eas_waitq,
 873                                          eas.eas_in_flight == 0);
 874                 spin_lock_irqsave(&eas.eas_lock, flags);
 875         }
 876         spin_unlock_irqrestore(&eas.eas_lock, flags);
 877
 878 out:
 879         list_for_each_safe(pos, n, &pages) {
 880                 struct page *page = list_entry(pos, struct page,
 881                                                PAGE_LIST_ENTRY);
 882
 883                 list_del(&PAGE_LIST(page));
 884                 if (page->private != 0) {
 885                         eap = (struct echo_async_page *)page->private;
 886                         if (eap->eap_cookie != NULL)
 887                                 obd_teardown_async_page(exp, lsm, NULL,
 888                                                         eap->eap_cookie);
 889                         OBD_FREE(eap, sizeof(*eap));
 890                 }
 891                 __free_page(page);
 892         }
 893
 894         RETURN(rc);
 895 }
 896
 897 static int echo_client_prep_commit(struct obd_export *exp, int rw,
 898                                    struct obdo *oa, struct lov_stripe_md *lsm,
 899                                    obd_off offset, obd_size count,
 900                                    obd_size batch, struct obd_trans_info *oti)
 901 {
 902         struct obd_ioobj ioo;
 903         struct niobuf_local *lnb;
 904         struct niobuf_remote *rnb;
 905         obd_off off;
 906         obd_size npages, tot_pages;
 907         int i, ret = 0;
 908         ENTRY;
 909
 910         if (count <= 0 || (count & (PAGE_SIZE - 1)) != 0 ||
 911             (lsm != NULL && lsm->lsm_object_id != oa->o_id))
 912                 RETURN(-EINVAL);
 913
 914         npages = batch >> PAGE_SHIFT;
 915         tot_pages = count >> PAGE_SHIFT;
 916
 917         OBD_ALLOC(lnb, npages * sizeof(struct niobuf_local));
 918         OBD_ALLOC(rnb, npages * sizeof(struct niobuf_remote));
 919
 920         if (lnb == NULL || rnb == NULL)
 921                 GOTO(out, ret = -ENOMEM);
 922
 923         obdo_to_ioobj(oa, &ioo);
 924
 925         off = offset;
 926
 927         for(; tot_pages; tot_pages -= npages) {
 928                 if (tot_pages < npages)
 929                         npages = tot_pages;
 930
 931                 for (i = 0; i < npages; i++, off += PAGE_SIZE) {
 932                         rnb[i].offset = off;
 933                         rnb[i].len = PAGE_SIZE;
 934                 }
 935
 936                 /* XXX this can't be the best.. */
 937                 memset(oti, 0, sizeof(*oti));
 938                 ioo.ioo_bufcnt = npages;
 939
 940                 ret = obd_preprw(rw, exp, oa, 1, &ioo, npages, rnb, lnb, oti);
 941                 if (ret != 0)
 942                         GOTO(out, ret);
 943
 944                 for (i = 0; i < npages; i++) {
 945                         struct page *page = lnb[i].page;
 946
 947                         /* read past eof? */
 948                         if (page == NULL && lnb[i].rc == 0)
 949                                 continue;
 950
 951                         if (oa->o_id == ECHO_PERSISTENT_OBJID ||
 952                             (oa->o_valid & OBD_MD_FLFLAGS) == 0 ||
 953                             (oa->o_flags & OBD_FL_DEBUG_CHECK) == 0)
 954                                 continue;
 955
 956                         if (rw == OBD_BRW_WRITE)
 957                                 echo_client_page_debug_setup(lsm, page, rw,
 958                                                              oa->o_id,
 959                                                              rnb[i].offset,
 960                                                              rnb[i].len);
 961                         else
 962                                 echo_client_page_debug_check(lsm, page,
 963                                                              oa->o_id,
 964                                                              rnb[i].offset,
 965                                                              rnb[i].len);
 966                 }
 967
 968                 ret = obd_commitrw(rw, exp, oa, 1, &ioo, npages, lnb, oti, ret);
 969                 if (ret != 0)
 970                         GOTO(out, ret);
 971         }
 972
 973 out:
 974         if (lnb)
 975                 OBD_FREE(lnb, npages * sizeof(struct niobuf_local));
 976         if (rnb)
 977                 OBD_FREE(rnb, npages * sizeof(struct niobuf_remote));
 978         RETURN(ret);
 979 }
 980
 981 int echo_client_brw_ioctl(int rw, struct obd_export *exp,
 982                           struct obd_ioctl_data *data)
 983 {
 984         struct obd_device *obd = class_exp2obd(exp);
 985         struct echo_client_obd *ec = &obd->u.echo_client;
 986         struct obd_trans_info dummy_oti;
 987         struct ec_object *eco;
 988         int rc;
 989         ENTRY;
 990
 991         rc = echo_get_object(&eco, obd, &data->ioc_obdo1);
 992         if (rc)
 993                 RETURN(rc);
 994
 995         memset(&dummy_oti, 0, sizeof(dummy_oti));
 996
 997         data->ioc_obdo1.o_valid &= ~OBD_MD_FLHANDLE;
 998         data->ioc_obdo1.o_valid |= OBD_MD_FLGROUP;
 999         data->ioc_obdo1.o_gr = 2;
1000
1001         switch((long)data->ioc_pbuf1) {
1002         case 1:
1003                 if (data->ioc_pbuf2 == NULL) { // NULL user data pointer
1004                         rc = echo_client_kbrw(obd, rw, &data->ioc_obdo1,
1005                                               eco->eco_lsm, data->ioc_offset,
1006                                               data->ioc_count, &dummy_oti);
1007                 } else {
1008 #ifdef __KERNEL__
1009                         rc = echo_client_ubrw(obd, rw, &data->ioc_obdo1,
1010                                               eco->eco_lsm, data->ioc_offset,
1011                                               data->ioc_count, data->ioc_pbuf2,
1012                                               &dummy_oti);
1013 #endif
1014                 }
1015                 break;
1016         case 2:
1017                 rc = echo_client_async_page(ec->ec_exp, rw, &data->ioc_obdo1,
1018                                            eco->eco_lsm, data->ioc_offset,
1019                                            data->ioc_count, data->ioc_plen1);
1020                 break;
1021         case 3:
1022                 rc = echo_client_prep_commit(ec->ec_exp, rw, &data->ioc_obdo1,
1023                                             eco->eco_lsm, data->ioc_offset,
1024                                             data->ioc_count, data->ioc_plen1,
1025                                             &dummy_oti);
1026                 break;
1027         default:
1028                 rc = -EINVAL;
1029         }
1030         echo_put_object(eco);
1031         RETURN(rc);
1032 }
1033
1034 static int
1035 echo_ldlm_callback (struct ldlm_lock *lock, struct ldlm_lock_desc *new,
1036                     void *data, int flag)
1037 {
1038         struct ec_object       *eco = (struct ec_object *)data;
1039         struct echo_client_obd *ec = &(eco->eco_device->u.echo_client);
1040         struct lustre_handle    lockh;
1041         struct list_head       *el;
1042         int                     found = 0;
1043         int                     rc;
1044
1045         ldlm_lock2handle (lock, &lockh);
1046
1047         /* #ifdef this out if we're not feeling paranoid */
1048         spin_lock (&ec->ec_lock);
1049         list_for_each (el, &ec->ec_objects) {
1050                 found = (eco == list_entry(el, struct ec_object,
1051                                            eco_obj_chain));
1052                 if (found)
1053                         break;
1054         }
1055         spin_unlock (&ec->ec_lock);
1056         LASSERT (found);
1057
1058         switch (flag) {
1059         case LDLM_CB_BLOCKING:
1060                 CDEBUG(D_INFO, "blocking callback on "LPX64", handle "LPX64"\n",
1061                        eco->eco_id, lockh.cookie);
1062                 rc = ldlm_cli_cancel (&lockh);
1063                 if (rc != ELDLM_OK)
1064                         CERROR ("ldlm_cli_cancel failed: %d\n", rc);
1065                 break;
1066
1067         case LDLM_CB_CANCELING:
1068                 CDEBUG(D_INFO, "cancel callback on "LPX64", handle "LPX64"\n",
1069                        eco->eco_id, lockh.cookie);
1070                 break;
1071
1072         default:
1073                 LBUG ();
1074         }
1075
1076         return (0);
1077 }
1078
1079 static int
1080 echo_client_enqueue(struct obd_export *exp, struct obdo *oa,
1081                     int mode, obd_off offset, obd_size nob)
1082 {
1083         struct obd_device      *obd = exp->exp_obd;
1084         struct echo_client_obd *ec = &obd->u.echo_client;
1085         struct lustre_handle   *ulh = obdo_handle (oa);
1086         struct ec_object       *eco;
1087         struct ec_lock         *ecl;
1088         int                     flags;
1089         int                     rc;
1090
1091         if (!(mode == LCK_PR || mode == LCK_PW))
1092                 return -EINVAL;
1093
1094         if ((offset & (PAGE_SIZE - 1)) != 0 ||
1095             (nob & (PAGE_SIZE - 1)) != 0)
1096                 return -EINVAL;
1097
1098         rc = echo_get_object (&eco, obd, oa);
1099         if (rc != 0)
1100                 return rc;
1101
1102         rc = -ENOMEM;
1103         OBD_ALLOC (ecl, sizeof (*ecl));
1104         if (ecl == NULL)
1105                 goto failed_0;
1106
1107         ecl->ecl_mode = mode;
1108         ecl->ecl_object = eco;
1109         ecl->ecl_policy.l_extent.start = offset;
1110         ecl->ecl_policy.l_extent.end =
1111                 (nob == 0) ? ((obd_off) -1) : (offset + nob - 1);
1112
1113         flags = 0;
1114         rc = obd_enqueue(ec->ec_exp, eco->eco_lsm, LDLM_EXTENT,
1115                          &ecl->ecl_policy, mode, &flags, echo_ldlm_callback,
1116                          ldlm_completion_ast, NULL, eco, sizeof(struct ost_lvb),
1117                          lustre_swab_ost_lvb, &ecl->ecl_lock_handle);
1118         if (rc != 0)
1119                 goto failed_1;
1120
1121         CDEBUG(D_INFO, "enqueue handle "LPX64"\n", ecl->ecl_lock_handle.cookie);
1122
1123         /* NB ecl takes object ref from echo_get_object() above */
1124         spin_lock(&ec->ec_lock);
1125
1126         list_add(&ecl->ecl_exp_chain, &exp->exp_ec_data.eced_locks);
1127         ulh->cookie = ecl->ecl_cookie = ec->ec_unique++;
1128
1129         spin_unlock(&ec->ec_lock);
1130
1131         oa->o_valid |= OBD_MD_FLHANDLE;
1132         return 0;
1133
1134  failed_1:
1135         OBD_FREE (ecl, sizeof (*ecl));
1136  failed_0:
1137         echo_put_object (eco);
1138         return (rc);
1139 }
1140
1141 static int
1142 echo_client_cancel(struct obd_export *exp, struct obdo *oa)
1143 {
1144         struct obd_device      *obd = exp->exp_obd;
1145         struct echo_client_obd *ec = &obd->u.echo_client;
1146         struct lustre_handle   *ulh = obdo_handle (oa);
1147         struct ec_lock         *ecl = NULL;
1148         int                     found = 0;
1149         struct list_head       *el;
1150         int                     rc;
1151
1152         if ((oa->o_valid & OBD_MD_FLHANDLE) == 0)
1153                 return -EINVAL;
1154
1155         spin_lock (&ec->ec_lock);
1156
1157         list_for_each (el, &exp->exp_ec_data.eced_locks) {
1158                 ecl = list_entry (el, struct ec_lock, ecl_exp_chain);
1159                 found = (ecl->ecl_cookie == ulh->cookie);
1160                 if (found) {
1161                         list_del (&ecl->ecl_exp_chain);
1162                         break;
1163                 }
1164         }
1165
1166         spin_unlock (&ec->ec_lock);
1167
1168         if (!found)
1169                 return (-ENOENT);
1170
1171         rc = obd_cancel(ec->ec_exp, ecl->ecl_object->eco_lsm, ecl->ecl_mode,
1172                         &ecl->ecl_lock_handle);
1173
1174         echo_put_object (ecl->ecl_object);
1175         OBD_FREE (ecl, sizeof (*ecl));
1176
1177         return rc;
1178 }
1179
1180 static int
1181 echo_client_iocontrol(unsigned int cmd, struct obd_export *exp,
1182                       int len, void *karg, void *uarg)
1183 {
1184         struct obd_device      *obd;
1185         struct echo_client_obd *ec;
1186         struct ec_object       *eco;
1187         struct obd_ioctl_data  *data = karg;
1188         struct obd_trans_info   dummy_oti;
1189         struct oti_req_ack_lock *ack_lock;
1190         struct obdo            *oa;
1191         int                     rw = OBD_BRW_READ;
1192         int                     rc = 0;
1193         int                     i;
1194         ENTRY;
1195
1196         unlock_kernel();
1197
1198         memset(&dummy_oti, 0, sizeof(dummy_oti));
1199
1200         obd = exp->exp_obd;
1201         ec = &obd->u.echo_client;
1202
1203         switch (cmd) {
1204         case OBD_IOC_CREATE:                    /* may create echo object */
1205                 if (!capable (CAP_SYS_ADMIN))
1206                         GOTO (out, rc = -EPERM);
1207
1208                 rc = echo_create_object (obd, 1, &data->ioc_obdo1,
1209                                          data->ioc_pbuf1, data->ioc_plen1,
1210                                          &dummy_oti);
1211                 GOTO(out, rc);
1212
1213         case OBD_IOC_DESTROY:
1214                 if (!capable (CAP_SYS_ADMIN))
1215                         GOTO (out, rc = -EPERM);
1216
1217                 rc = echo_get_object (&eco, obd, &data->ioc_obdo1);
1218                 if (rc == 0) {
1219                         oa = &data->ioc_obdo1;
1220                         oa->o_gr = 2;
1221                         oa->o_valid |= OBD_MD_FLGROUP;
1222                         rc = obd_destroy(ec->ec_exp, oa, eco->eco_lsm,
1223                                          &dummy_oti);
1224                         if (rc == 0)
1225                                 eco->eco_deleted = 1;
1226                         echo_put_object(eco);
1227                 }
1228                 GOTO(out, rc);
1229
1230         case OBD_IOC_GETATTR:
1231                 rc = echo_get_object (&eco, obd, &data->ioc_obdo1);
1232                 if (rc == 0) {
1233                         rc = obd_getattr(ec->ec_exp, &data->ioc_obdo1,
1234                                          eco->eco_lsm);
1235                         echo_put_object(eco);
1236                 }
1237                 GOTO(out, rc);
1238
1239         case OBD_IOC_SETATTR:
1240                 if (!capable (CAP_SYS_ADMIN))
1241                         GOTO (out, rc = -EPERM);
1242
1243                 rc = echo_get_object (&eco, obd, &data->ioc_obdo1);
1244                 if (rc == 0) {
1245                         rc = obd_setattr(ec->ec_exp, &data->ioc_obdo1,
1246                                          eco->eco_lsm, NULL);
1247                         echo_put_object(eco);
1248                 }
1249                 GOTO(out, rc);
1250
1251         case OBD_IOC_BRW_WRITE:
1252                 if (!capable (CAP_SYS_ADMIN))
1253                         GOTO (out, rc = -EPERM);
1254
1255                 rw = OBD_BRW_WRITE;
1256                 /* fall through */
1257         case OBD_IOC_BRW_READ:
1258                 rc = echo_client_brw_ioctl(rw, exp, data);
1259                 GOTO(out, rc);
1260
1261         case ECHO_IOC_GET_STRIPE:
1262                 rc = echo_get_object(&eco, obd, &data->ioc_obdo1);
1263                 if (rc == 0) {
1264                         rc = echo_copyout_lsm(eco->eco_lsm, data->ioc_pbuf1,
1265                                               data->ioc_plen1);
1266                         echo_put_object(eco);
1267                 }
1268                 GOTO(out, rc);
1269
1270         case ECHO_IOC_SET_STRIPE:
1271                 if (!capable (CAP_SYS_ADMIN))
1272                         GOTO (out, rc = -EPERM);
1273
1274                 if (data->ioc_pbuf1 == NULL) {  /* unset */
1275                         rc = echo_get_object(&eco, obd, &data->ioc_obdo1);
1276                         if (rc == 0) {
1277                                 eco->eco_deleted = 1;
1278                                 echo_put_object(eco);
1279                         }
1280                 } else {
1281                         rc = echo_create_object(obd, 0, &data->ioc_obdo1,
1282                                                 data->ioc_pbuf1,
1283                                                 data->ioc_plen1, &dummy_oti);
1284                 }
1285                 GOTO (out, rc);
1286
1287         case ECHO_IOC_ENQUEUE:
1288                 if (!capable (CAP_SYS_ADMIN))
1289                         GOTO (out, rc = -EPERM);
1290
1291                 rc = echo_client_enqueue(exp, &data->ioc_obdo1,
1292                                          data->ioc_conn1, /* lock mode */
1293                                    data->ioc_offset, data->ioc_count);/*extent*/
1294                 GOTO (out, rc);
1295
1296         case ECHO_IOC_CANCEL:
1297                 rc = echo_client_cancel(exp, &data->ioc_obdo1);
1298                 GOTO (out, rc);
1299
1300         default:
1301                 CERROR ("echo_ioctl(): unrecognised ioctl %#x\n", cmd);
1302                 GOTO (out, rc = -ENOTTY);
1303         }
1304
1305         EXIT;
1306  out:
1307
1308         /* XXX this should be in a helper also called by target_send_reply */
1309         for (ack_lock = dummy_oti.oti_ack_locks, i = 0; i < 4;
1310              i++, ack_lock++) {
1311                 if (!ack_lock->mode)
1312                         break;
1313                 ldlm_lock_decref(&ack_lock->lock, ack_lock->mode);
1314         }
1315
1316         lock_kernel();
1317
1318         return rc;
1319 }
1320
1321 static int
1322 echo_client_setup(struct obd_device *obddev, obd_count len, void *buf)
1323 {
1324         struct lustre_cfg* lcfg = buf;
1325         struct echo_client_obd *ec = &obddev->u.echo_client;
1326         struct obd_device *tgt;
1327         struct lustre_handle conn = {0, };
1328         struct obd_uuid echo_uuid = { "ECHO_UUID" };
1329         int rc;
1330         ENTRY;
1331
1332         if (lcfg->lcfg_bufcount < 2 || LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
1333                 CERROR("requires a TARGET OBD name\n");
1334                 RETURN(-EINVAL);
1335         }
1336
1337         tgt = class_name2obd(lustre_cfg_string(lcfg, 1));
1338         if (!tgt || !tgt->obd_attached || !tgt->obd_set_up) {
1339                 CERROR("device not attached or not set up (%s)\n",
1340                        lustre_cfg_string(lcfg, 1));
1341                 RETURN(-EINVAL);
1342         }
1343
1344         spin_lock_init (&ec->ec_lock);
1345         INIT_LIST_HEAD (&ec->ec_objects);
1346         ec->ec_unique = 0;
1347
1348         rc = obd_connect(&conn, tgt, &echo_uuid);
1349         if (rc) {
1350                 CERROR("fail to connect to device %s\n",
1351                        lustre_cfg_string(lcfg, 1));
1352                 return (rc);
1353         }
1354         ec->ec_exp = class_conn2export(&conn);
1355
1356         RETURN(rc);
1357 }
1358
1359 static int echo_client_cleanup(struct obd_device *obddev)
1360 {
1361         struct list_head       *el;
1362         struct ec_object       *eco;
1363         struct echo_client_obd *ec = &obddev->u.echo_client;
1364         int rc;
1365         ENTRY;
1366
1367         if (!list_empty(&obddev->obd_exports)) {
1368                 CERROR("still has clients!\n");
1369                 RETURN(-EBUSY);
1370         }
1371
1372         /* XXX assuming sole access */
1373         while (!list_empty(&ec->ec_objects)) {
1374                 el = ec->ec_objects.next;
1375                 eco = list_entry(el, struct ec_object, eco_obj_chain);
1376
1377                 LASSERT(eco->eco_refcount == 0);
1378                 eco->eco_refcount = 1;
1379                 eco->eco_deleted = 1;
1380                 echo_put_object(eco);
1381         }
1382
1383         rc = obd_disconnect(ec->ec_exp);
1384         if (rc != 0)
1385                 CERROR("fail to disconnect device: %d\n", rc);
1386
1387         RETURN(rc);
1388 }
1389
1390 static int echo_client_connect(struct lustre_handle *conn,
1391                                struct obd_device *src, struct obd_uuid *cluuid)
1392 {
1393         struct obd_export *exp;
1394         int                rc;
1395
1396         rc = class_connect(conn, src, cluuid);
1397         if (rc == 0) {
1398                 exp = class_conn2export(conn);
1399                 INIT_LIST_HEAD(&exp->exp_ec_data.eced_locks);
1400                 class_export_put(exp);
1401         }
1402
1403         RETURN (rc);
1404 }
1405
1406 static int echo_client_disconnect(struct obd_export *exp)
1407 {
1408         struct obd_device      *obd;
1409         struct echo_client_obd *ec;
1410         struct ec_lock         *ecl;
1411         int                     rc;
1412         ENTRY;
1413
1414         if (exp == NULL)
1415                 GOTO(out, rc = -EINVAL);
1416
1417         obd = exp->exp_obd;
1418         ec = &obd->u.echo_client;
1419
1420         /* no more contention on export's lock list */
1421         while (!list_empty (&exp->exp_ec_data.eced_locks)) {
1422                 ecl = list_entry (exp->exp_ec_data.eced_locks.next,
1423                                   struct ec_lock, ecl_exp_chain);
1424                 list_del (&ecl->ecl_exp_chain);
1425
1426                 rc = obd_cancel(ec->ec_exp, ecl->ecl_object->eco_lsm,
1427                                  ecl->ecl_mode, &ecl->ecl_lock_handle);
1428
1429                 CDEBUG (D_INFO, "Cancel lock on object "LPX64" on disconnect "
1430                         "(%d)\n", ecl->ecl_object->eco_id, rc);
1431
1432                 echo_put_object (ecl->ecl_object);
1433                 OBD_FREE (ecl, sizeof (*ecl));
1434         }
1435
1436         rc = class_disconnect(exp);
1437         GOTO(out, rc);
1438  out:
1439         return rc;
1440 }
1441
1442 static struct obd_ops echo_obd_ops = {
1443         .o_owner       = THIS_MODULE,
1444         .o_setup       = echo_client_setup,
1445         .o_cleanup     = echo_client_cleanup,
1446         .o_iocontrol   = echo_client_iocontrol,
1447         .o_connect     = echo_client_connect,
1448         .o_disconnect  = echo_client_disconnect
1449 };
1450
1451 int echo_client_init(void)
1452 {
1453         struct lprocfs_static_vars lvars;
1454
1455         lprocfs_init_vars(echo, &lvars);
1456         return class_register_type(&echo_obd_ops, lvars.module_vars,
1457                                    OBD_ECHO_CLIENT_DEVICENAME);
1458 }
1459
1460 void echo_client_exit(void)
1461 {
1462         class_unregister_type(OBD_ECHO_CLIENT_DEVICENAME);
1463 }