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         obd_count               npages;
 497         struct brw_page        *pga;
 498         struct brw_page        *pgp;
 499         obd_off                 off;
 500         int                     i;
 501         int                     rc;
 502         int                     verify;
 503         int                     gfp_mask;
 504
 505         verify = ((oa->o_id) != ECHO_PERSISTENT_OBJID &&
 506                   (oa->o_valid & OBD_MD_FLFLAGS) != 0 &&
 507                   (oa->o_flags & OBD_FL_DEBUG_CHECK) != 0);
 508
 509         gfp_mask = ((oa->o_id & 2) == 0) ? CFS_ALLOC_STD : CFS_ALLOC_HIGHUSER;
 510
 511         LASSERT(rw == OBD_BRW_WRITE || rw == OBD_BRW_READ);
 512         LASSERT(lsm != NULL);
 513         LASSERT(lsm->lsm_object_id == oa->o_id);
 514
 515         if (count <= 0 ||
 516             (count & (CFS_PAGE_SIZE - 1)) != 0)
 517                 return (-EINVAL);
 518
 519         /* XXX think again with misaligned I/O */
 520         npages = count >> CFS_PAGE_SHIFT;
 521
 522         OBD_ALLOC(pga, npages * sizeof(*pga));
 523         if (pga == NULL)
 524                 return (-ENOMEM);
 525
 526         for (i = 0, pgp = pga, off = offset;
 527              i < npages;
 528              i++, pgp++, off += CFS_PAGE_SIZE) {
 529
 530                 LASSERT (pgp->pg == NULL);      /* for cleanup */
 531
 532                 rc = -ENOMEM;
 533                 pgp->pg = cfs_alloc_page (gfp_mask);
 534                 if (pgp->pg == NULL)
 535                         goto out;
 536
 537                 pgp->count = CFS_PAGE_SIZE;
 538                 pgp->off = off;
 539                 pgp->flag = 0;
 540
 541                 if (verify)
 542                         echo_client_page_debug_setup(lsm, pgp->pg, rw,
 543                                                      oa->o_id, off, pgp->count);
 544         }
 545
 546         rc = obd_brw(rw, ec->ec_exp, oa, lsm, npages, pga, oti);
 547
 548  out:
 549         if (rc != 0 || rw != OBD_BRW_READ)
 550                 verify = 0;
 551
 552         for (i = 0, pgp = pga; i < npages; i++, pgp++) {
 553                 if (pgp->pg == NULL)
 554                         continue;
 555
 556                 if (verify) {
 557                         int vrc;
 558                         vrc = echo_client_page_debug_check(lsm, pgp->pg, oa->o_id,
 559                                                            pgp->off, pgp->count);
 560                         if (vrc != 0 && rc == 0)
 561                                 rc = vrc;
 562                 }
 563                 cfs_free_page(pgp->pg);
 564         }
 565         OBD_FREE(pga, npages * sizeof(*pga));
 566         return (rc);
 567 }
 568
 569 #ifdef __KERNEL__
 570 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 571 static int echo_client_ubrw(struct obd_device *obd, int rw,
 572                             struct obdo *oa, struct lov_stripe_md *lsm,
 573                             obd_off offset, obd_size count, char *buffer,
 574                             struct obd_trans_info *oti)
 575 {
 576         struct echo_client_obd *ec = &obd->u.echo_client;
 577         obd_count               npages;
 578         struct brw_page        *pga;
 579         struct brw_page        *pgp;
 580         obd_off                 off;
 581         struct kiobuf          *kiobuf;
 582         int                     i;
 583         int                     rc;
 584
 585         LASSERT (rw == OBD_BRW_WRITE ||
 586                  rw == OBD_BRW_READ);
 587
 588         /* NB: for now, only whole pages, page aligned */
 589
 590         if (count <= 0 ||
 591             ((long)buffer & (CFS_PAGE_SIZE - 1)) != 0 ||
 592             (count & (CFS_PAGE_SIZE - 1)) != 0 ||
 593             (lsm != NULL && lsm->lsm_object_id != oa->o_id))
 594                 return (-EINVAL);
 595
 596         /* XXX think again with misaligned I/O */
 597         npages = count >> CFS_PAGE_SHIFT;
 598
 599         OBD_ALLOC(pga, npages * sizeof(*pga));
 600         if (pga == NULL)
 601                 return (-ENOMEM);
 602
 603         rc = alloc_kiovec (1, &kiobuf);
 604         if (rc != 0)
 605                 goto out_1;
 606
 607         rc = map_user_kiobuf ((rw == OBD_BRW_READ) ? READ : WRITE,
 608                               kiobuf, (unsigned long)buffer, count);
 609         if (rc != 0)
 610                 goto out_2;
 611
 612         LASSERT (kiobuf->offset == 0);
 613         LASSERT (kiobuf->nr_pages == npages);
 614
 615         for (i = 0, off = offset, pgp = pga;
 616              i < npages;
 617              i++, off += CFS_PAGE_SIZE, pgp++) {
 618                 pgp->off = off;
 619                 pgp->pg = kiobuf->maplist[i];
 620                 pgp->count = CFS_PAGE_SIZE;
 621                 pgp->flag = 0;
 622         }
 623
 624         rc = obd_brw(rw, ec->ec_exp, oa, lsm, npages, pga, oti);
 625
 626         //        if (rw == OBD_BRW_READ)
 627         //                mark_dirty_kiobuf (kiobuf, count);
 628
 629         unmap_kiobuf (kiobuf);
 630  out_2:
 631         free_kiovec (1, &kiobuf);
 632  out_1:
 633         OBD_FREE(pga, npages * sizeof(*pga));
 634         return (rc);
 635 }
 636 #else
 637 static int echo_client_ubrw(struct obd_device *obd, int rw,
 638                             struct obdo *oa, struct lov_stripe_md *lsm,
 639                             obd_off offset, obd_size count, char *buffer,
 640                             struct obd_trans_info *oti)
 641 {
 642 #warning "echo_client_ubrw() needs to be ported on 2.6 yet"
 643         LBUG();
 644         return 0;
 645 }
 646 #endif
 647 #endif
 648
 649 struct echo_async_state;
 650
 651 #define EAP_MAGIC 79277927
 652 struct echo_async_page {
 653         int                     eap_magic;
 654         cfs_page_t             *eap_page;
 655         void                    *eap_cookie;
 656         obd_off                 eap_off;
 657         struct echo_async_state *eap_eas;
 658         struct list_head        eap_item;
 659 };
 660
 661 #define EAP_FROM_COOKIE(c)                                                      \
 662         (LASSERT(((struct echo_async_page *)(c))->eap_magic == EAP_MAGIC),      \
 663          (struct echo_async_page *)(c))
 664
 665 struct echo_async_state {
 666         spinlock_t              eas_lock;
 667         obd_off                 eas_next_offset;
 668         obd_off                 eas_end_offset;
 669         int                     eas_in_flight;
 670         int                     eas_rc;
 671         cfs_waitq_t             eas_waitq;
 672         struct list_head        eas_avail;
 673         struct obdo             eas_oa;
 674         struct lov_stripe_md    *eas_lsm;
 675 };
 676
 677 static int eas_should_wake(struct echo_async_state *eas)
 678 {
 679         unsigned long flags;
 680         int rc = 0;
 681         spin_lock_irqsave(&eas->eas_lock, flags);
 682         if (eas->eas_rc == 0 && !list_empty(&eas->eas_avail))
 683             rc = 1;
 684         spin_unlock_irqrestore(&eas->eas_lock, flags);
 685         return rc;
 686 };
 687
 688 static int ec_ap_make_ready(void *data, int cmd)
 689 {
 690         /* our pages are issued ready */
 691         LBUG();
 692         return 0;
 693 }
 694 static int ec_ap_refresh_count(void *data, int cmd)
 695 {
 696         /* our pages are issued with a stable count */
 697         LBUG();
 698         return CFS_PAGE_SIZE;
 699 }
 700 static void ec_ap_fill_obdo(void *data, int cmd, struct obdo *oa)
 701 {
 702         struct echo_async_page *eap = EAP_FROM_COOKIE(data);
 703
 704         memcpy(oa, &eap->eap_eas->eas_oa, sizeof(*oa));
 705 }
 706
 707 static void ec_ap_completion(void *data, int cmd, struct obdo *oa, int rc)
 708 {
 709         struct echo_async_page *eap = EAP_FROM_COOKIE(data);
 710         struct echo_async_state *eas;
 711         unsigned long flags;
 712
 713         eas = eap->eap_eas;
 714
 715         if (cmd == OBD_BRW_READ &&
 716             eas->eas_oa.o_id != ECHO_PERSISTENT_OBJID &&
 717             (eas->eas_oa.o_valid & OBD_MD_FLFLAGS) != 0 &&
 718             (eas->eas_oa.o_flags & OBD_FL_DEBUG_CHECK) != 0)
 719                 echo_client_page_debug_check(eas->eas_lsm, eap->eap_page,
 720                                              eas->eas_oa.o_id, eap->eap_off,
 721                                              CFS_PAGE_SIZE);
 722
 723         spin_lock_irqsave(&eas->eas_lock, flags);
 724         if (rc && !eas->eas_rc)
 725                 eas->eas_rc = rc;
 726         eas->eas_in_flight--;
 727         list_add(&eap->eap_item, &eas->eas_avail);
 728         cfs_waitq_signal(&eas->eas_waitq);
 729         spin_unlock_irqrestore(&eas->eas_lock, flags);
 730 }
 731
 732 static struct obd_async_page_ops ec_async_page_ops = {
 733         .ap_make_ready =        ec_ap_make_ready,
 734         .ap_refresh_count =     ec_ap_refresh_count,
 735         .ap_fill_obdo =         ec_ap_fill_obdo,
 736         .ap_completion =        ec_ap_completion,
 737 };
 738
 739 static int echo_client_async_page(struct obd_export *exp, int rw,
 740                                    struct obdo *oa, struct lov_stripe_md *lsm,
 741                                    obd_off offset, obd_size count,
 742                                    obd_size batching)
 743 {
 744         obd_count npages, i;
 745         struct echo_async_page *eap;
 746         struct echo_async_state eas;
 747         int rc = 0;
 748         unsigned long flags;
 749         struct echo_async_page **aps = NULL;
 750
 751         ENTRY;
 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 & (CFS_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 >> CFS_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         cfs_waitq_init(&eas.eas_waitq);
 779         eas.eas_in_flight = 0;
 780         eas.eas_rc = 0;
 781         eas.eas_lsm = lsm;
 782         CFS_INIT_LIST_HEAD(&eas.eas_avail);
 783
 784         OBD_ALLOC(aps, npages * sizeof aps[0]);
 785         if (aps == NULL)
 786                 return (-ENOMEM);
 787
 788         /* prepare the group of pages that we're going to be keeping
 789          * in flight */
 790         for (i = 0; i < npages; i++) {
 791                 cfs_page_t *page = cfs_alloc_page(CFS_ALLOC_STD);
 792                 if (page == NULL)
 793                         GOTO(out, rc = -ENOMEM);
 794
 795                 OBD_ALLOC(eap, sizeof(*eap));
 796                 if (eap == NULL) {
 797                         cfs_free_page(page);
 798                         GOTO(out, rc = -ENOMEM);
 799                 }
 800
 801                 eap->eap_magic = EAP_MAGIC;
 802                 eap->eap_page = page;
 803                 eap->eap_eas = &eas;
 804                 list_add_tail(&eap->eap_item, &eas.eas_avail);
 805                 aps[i] = eap;
 806         }
 807
 808         /* first we spin queueing io and being woken by its completion */
 809         spin_lock_irqsave(&eas.eas_lock, flags);
 810         for(;;) {
 811                 int rc;
 812
 813                 /* sleep until we have a page to send */
 814                 spin_unlock_irqrestore(&eas.eas_lock, flags);
 815                 rc = wait_event_interruptible(eas.eas_waitq,
 816                                               eas_should_wake(&eas));
 817                 spin_lock_irqsave(&eas.eas_lock, flags);
 818                 if (rc && !eas.eas_rc)
 819                         eas.eas_rc = rc;
 820                 if (eas.eas_rc)
 821                         break;
 822                 if (list_empty(&eas.eas_avail))
 823                         continue;
 824                 eap = list_entry(eas.eas_avail.next, struct echo_async_page,
 825                                  eap_item);
 826                 list_del(&eap->eap_item);
 827                 spin_unlock_irqrestore(&eas.eas_lock, flags);
 828
 829                 /* unbind the eap from its old page offset */
 830                 if (eap->eap_cookie != NULL) {
 831                         obd_teardown_async_page(exp, lsm, NULL,
 832                                                 eap->eap_cookie);
 833                         eap->eap_cookie = NULL;
 834                 }
 835
 836                 eas.eas_next_offset += CFS_PAGE_SIZE;
 837                 eap->eap_off = eas.eas_next_offset;
 838
 839                 rc = obd_prep_async_page(exp, lsm, NULL, eap->eap_page,
 840                                          eap->eap_off, &ec_async_page_ops,
 841                                          eap, &eap->eap_cookie);
 842                 if (rc) {
 843                         spin_lock_irqsave(&eas.eas_lock, flags);
 844                         eas.eas_rc = rc;
 845                         break;
 846                 }
 847
 848                 if (oa->o_id != ECHO_PERSISTENT_OBJID &&
 849                     (oa->o_valid & OBD_MD_FLFLAGS) != 0 &&
 850                     (oa->o_flags & OBD_FL_DEBUG_CHECK) != 0)
 851                         echo_client_page_debug_setup(lsm, eap->eap_page, rw,
 852                                                      oa->o_id,
 853                                                      eap->eap_off, CFS_PAGE_SIZE);
 854
 855                 /* always asserts urgent, which isn't quite right */
 856                 rc = obd_queue_async_io(exp, lsm, NULL, eap->eap_cookie,
 857                                         rw, 0, CFS_PAGE_SIZE, 0,
 858                                         ASYNC_READY | ASYNC_URGENT |
 859                                         ASYNC_COUNT_STABLE);
 860                 spin_lock_irqsave(&eas.eas_lock, flags);
 861                 if (rc && !eas.eas_rc) {
 862                         eas.eas_rc = rc;
 863                         break;
 864                 }
 865                 eas.eas_in_flight++;
 866                 if (eas.eas_next_offset == eas.eas_end_offset)
 867                         break;
 868         }
 869
 870         /* still hold the eas_lock here.. */
 871
 872         /* now we just spin waiting for all the rpcs to complete */
 873         while(eas.eas_in_flight) {
 874                 spin_unlock_irqrestore(&eas.eas_lock, flags);
 875                 wait_event_interruptible(eas.eas_waitq,
 876                                          eas.eas_in_flight == 0);
 877                 spin_lock_irqsave(&eas.eas_lock, flags);
 878         }
 879         spin_unlock_irqrestore(&eas.eas_lock, flags);
 880
 881 out:
 882         if (aps != NULL) {
 883                 for (i = 0; i < npages; ++ i) {
 884                         cfs_page_t *page;
 885
 886                         eap = aps[i];
 887                         page = eap->eap_page;
 888                         if (eap->eap_cookie != NULL)
 889                                 obd_teardown_async_page(exp, lsm, NULL,
 890                                                         eap->eap_cookie);
 891                         OBD_FREE(eap, sizeof(*eap));
 892                         cfs_free_page(page);
 893                 }
 894                 OBD_FREE(aps, npages * sizeof aps[0]);
 895         }
 896
 897         RETURN(rc);
 898 }
 899
 900 static int echo_client_prep_commit(struct obd_export *exp, int rw,
 901                                    struct obdo *oa, struct lov_stripe_md *lsm,
 902                                    obd_off offset, obd_size count,
 903                                    obd_size batch, struct obd_trans_info *oti)
 904 {
 905         struct obd_ioobj ioo;
 906         struct niobuf_local *lnb;
 907         struct niobuf_remote *rnb;
 908         obd_off off;
 909         obd_size npages, tot_pages;
 910         int i, ret = 0;
 911         ENTRY;
 912
 913         if (count <= 0 || (count & (CFS_PAGE_SIZE - 1)) != 0 ||
 914             (lsm != NULL && lsm->lsm_object_id != oa->o_id))
 915                 RETURN(-EINVAL);
 916
 917         npages = batch >> CFS_PAGE_SHIFT;
 918         tot_pages = count >> CFS_PAGE_SHIFT;
 919
 920         OBD_ALLOC(lnb, npages * sizeof(struct niobuf_local));
 921         OBD_ALLOC(rnb, npages * sizeof(struct niobuf_remote));
 922
 923         if (lnb == NULL || rnb == NULL)
 924                 GOTO(out, ret = -ENOMEM);
 925
 926         obdo_to_ioobj(oa, &ioo);
 927
 928         off = offset;
 929
 930         for(; tot_pages; tot_pages -= npages) {
 931                 if (tot_pages < npages)
 932                         npages = tot_pages;
 933
 934                 for (i = 0; i < npages; i++, off += CFS_PAGE_SIZE) {
 935                         rnb[i].offset = off;
 936                         rnb[i].len = CFS_PAGE_SIZE;
 937                 }
 938
 939                 ioo.ioo_bufcnt = npages;
 940                 oti->oti_transno = 0;
 941
 942                 ret = obd_preprw(rw, exp, oa, 1, &ioo, npages, rnb, lnb, oti);
 943                 if (ret != 0)
 944                         GOTO(out, ret);
 945
 946                 for (i = 0; i < npages; i++) {
 947                         cfs_page_t *page = lnb[i].page;
 948
 949                         /* read past eof? */
 950                         if (page == NULL && lnb[i].rc == 0)
 951                                 continue;
 952
 953                         if (oa->o_id == ECHO_PERSISTENT_OBJID ||
 954                             (oa->o_valid & OBD_MD_FLFLAGS) == 0 ||
 955                             (oa->o_flags & OBD_FL_DEBUG_CHECK) == 0)
 956                                 continue;
 957
 958                         if (rw == OBD_BRW_WRITE)
 959                                 echo_client_page_debug_setup(lsm, page, rw,
 960                                                              oa->o_id,
 961                                                              rnb[i].offset,
 962                                                              rnb[i].len);
 963                         else
 964                                 echo_client_page_debug_check(lsm, page,
 965                                                              oa->o_id,
 966                                                              rnb[i].offset,
 967                                                              rnb[i].len);
 968                 }
 969
 970                 ret = obd_commitrw(rw, exp, oa, 1, &ioo, npages, lnb, oti, ret);
 971                 if (ret != 0)
 972                         GOTO(out, ret);
 973         }
 974
 975 out:
 976         if (lnb)
 977                 OBD_FREE(lnb, npages * sizeof(struct niobuf_local));
 978         if (rnb)
 979                 OBD_FREE(rnb, npages * sizeof(struct niobuf_remote));
 980         RETURN(ret);
 981 }
 982
 983 int echo_client_brw_ioctl(int rw, struct obd_export *exp,
 984                           struct obd_ioctl_data *data)
 985 {
 986         struct obd_device *obd = class_exp2obd(exp);
 987         struct echo_client_obd *ec = &obd->u.echo_client;
 988         struct obd_trans_info dummy_oti = { .oti_thread_id = -1 };
 989         struct ec_object *eco;
 990         int rc;
 991         ENTRY;
 992
 993         rc = echo_get_object(&eco, obd, &data->ioc_obdo1);
 994         if (rc)
 995                 RETURN(rc);
 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 = FILTER_GROUP_ECHO;
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 & (CFS_PAGE_SIZE - 1)) != 0 ||
1095             (nob & (CFS_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 = FILTER_GROUP_ECHO;
1221                         oa->o_valid |= OBD_MD_FLGROUP;
1222                         rc = obd_destroy(ec->ec_exp, oa, eco->eco_lsm,
1223                                          &dummy_oti, NULL);
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 echo_client_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
1322 {
1323         struct echo_client_obd *ec = &obddev->u.echo_client;
1324         struct obd_device *tgt;
1325         struct lustre_handle conn = {0, };
1326         struct obd_uuid echo_uuid = { "ECHO_UUID" };
1327         struct obd_connect_data *ocd = NULL;
1328         int rc;
1329         ENTRY;
1330
1331         if (lcfg->lcfg_bufcount < 2 || LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
1332                 CERROR("requires a TARGET OBD name\n");
1333                 RETURN(-EINVAL);
1334         }
1335
1336         tgt = class_name2obd(lustre_cfg_string(lcfg, 1));
1337         if (!tgt || !tgt->obd_attached || !tgt->obd_set_up) {
1338                 CERROR("device not attached or not set up (%s)\n",
1339                        lustre_cfg_string(lcfg, 1));
1340                 RETURN(-EINVAL);
1341         }
1342
1343         spin_lock_init (&ec->ec_lock);
1344         CFS_INIT_LIST_HEAD (&ec->ec_objects);
1345         ec->ec_unique = 0;
1346
1347         OBD_ALLOC(ocd, sizeof(*ocd));
1348         if (ocd == NULL) {
1349                 CERROR("Can't alloc ocd connecting to %s\n",
1350                        lustre_cfg_string(lcfg, 1));
1351                 return -ENOMEM;
1352         }
1353
1354         ocd->ocd_connect_flags = OBD_CONNECT_VERSION;
1355         ocd->ocd_version = LUSTRE_VERSION_CODE;
1356
1357         rc = obd_connect(NULL, &conn, tgt, &echo_uuid, ocd);
1358
1359         OBD_FREE(ocd, sizeof(*ocd));
1360
1361         if (rc != 0) {
1362                 CERROR("fail to connect to device %s\n",
1363                        lustre_cfg_string(lcfg, 1));
1364                 return (rc);
1365         }
1366         ec->ec_exp = class_conn2export(&conn);
1367
1368         RETURN(rc);
1369 }
1370
1371 static int echo_client_cleanup(struct obd_device *obddev)
1372 {
1373         struct list_head       *el;
1374         struct ec_object       *eco;
1375         struct echo_client_obd *ec = &obddev->u.echo_client;
1376         int rc;
1377         ENTRY;
1378
1379         if (!list_empty(&obddev->obd_exports)) {
1380                 CERROR("still has clients!\n");
1381                 RETURN(-EBUSY);
1382         }
1383
1384         /* XXX assuming sole access */
1385         while (!list_empty(&ec->ec_objects)) {
1386                 el = ec->ec_objects.next;
1387                 eco = list_entry(el, struct ec_object, eco_obj_chain);
1388
1389                 LASSERT(eco->eco_refcount == 0);
1390                 eco->eco_refcount = 1;
1391                 eco->eco_deleted = 1;
1392                 echo_put_object(eco);
1393         }
1394
1395         rc = obd_disconnect(ec->ec_exp);
1396         if (rc != 0)
1397                 CERROR("fail to disconnect device: %d\n", rc);
1398
1399         RETURN(rc);
1400 }
1401
1402 static int echo_client_connect(const struct lu_context *ctx,
1403                                struct lustre_handle *conn,
1404                                struct obd_device *src, struct obd_uuid *cluuid,
1405                                struct obd_connect_data *data)
1406 {
1407         struct obd_export *exp;
1408         int                rc;
1409
1410         ENTRY;
1411         rc = class_connect(conn, src, cluuid);
1412         if (rc == 0) {
1413                 exp = class_conn2export(conn);
1414                 CFS_INIT_LIST_HEAD(&exp->exp_ec_data.eced_locks);
1415                 class_export_put(exp);
1416         }
1417
1418         RETURN (rc);
1419 }
1420
1421 static int echo_client_disconnect(struct obd_export *exp)
1422 {
1423         struct obd_device      *obd;
1424         struct echo_client_obd *ec;
1425         struct ec_lock         *ecl;
1426         int                     rc;
1427         ENTRY;
1428
1429         if (exp == NULL)
1430                 GOTO(out, rc = -EINVAL);
1431
1432         obd = exp->exp_obd;
1433         ec = &obd->u.echo_client;
1434
1435         /* no more contention on export's lock list */
1436         while (!list_empty (&exp->exp_ec_data.eced_locks)) {
1437                 ecl = list_entry (exp->exp_ec_data.eced_locks.next,
1438                                   struct ec_lock, ecl_exp_chain);
1439                 list_del (&ecl->ecl_exp_chain);
1440
1441                 rc = obd_cancel(ec->ec_exp, ecl->ecl_object->eco_lsm,
1442                                  ecl->ecl_mode, &ecl->ecl_lock_handle);
1443
1444                 CDEBUG (D_INFO, "Cancel lock on object "LPX64" on disconnect "
1445                         "(%d)\n", ecl->ecl_object->eco_id, rc);
1446
1447                 echo_put_object (ecl->ecl_object);
1448                 OBD_FREE (ecl, sizeof (*ecl));
1449         }
1450
1451         rc = class_disconnect(exp);
1452         GOTO(out, rc);
1453  out:
1454         return rc;
1455 }
1456
1457 static struct obd_ops echo_obd_ops = {
1458         .o_owner       = THIS_MODULE,
1459         .o_setup       = echo_client_setup,
1460         .o_cleanup     = echo_client_cleanup,
1461         .o_iocontrol   = echo_client_iocontrol,
1462         .o_connect     = echo_client_connect,
1463         .o_disconnect  = echo_client_disconnect
1464 };
1465
1466 int echo_client_init(void)
1467 {
1468         struct lprocfs_static_vars lvars;
1469
1470         lprocfs_init_vars(echo, &lvars);
1471         return class_register_type(&echo_obd_ops, NULL, lvars.module_vars,
1472                                    LUSTRE_ECHO_CLIENT_NAME, NULL);
1473 }
1474
1475 void echo_client_exit(void)
1476 {
1477         class_unregister_type(LUSTRE_ECHO_CLIENT_NAME);
1478 }