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 #else
  33 #include <liblustre.h>
  34 #endif
  35
  36 #include <linux/obd.h>
  37 #include <linux/obd_support.h>
  38 #include <linux/obd_class.h>
  39 #include <linux/obd_echo.h>
  40 #include <linux/lustre_debug.h>
  41 #include <linux/lprocfs_status.h>
  42
  43 static obd_id last_object_id;
  44
  45 #if 0
  46 static void
  47 echo_printk_object (char *msg, struct ec_object *eco)
  48 {
  49         struct lov_stripe_md *lsm = eco->eco_lsm;
  50         int                   i;
  51
  52         printk (KERN_INFO "Lustre: %s: object %p: "LPX64", refs %d%s: "LPX64
  53                 "=%u!%u\n", msg, eco, eco->eco_id, eco->eco_refcount,
  54                 eco->eco_deleted ? "(deleted) " : "",
  55                 lsm->lsm_object_id, lsm->lsm_stripe_size,
  56                 lsm->lsm_stripe_count);
  57
  58         for (i = 0; i < lsm->lsm_stripe_count; i++)
  59                 printk (KERN_INFO "Lustre:   @%2u:"LPX64"\n",
  60                         lsm->lsm_oinfo[i].loi_ost_idx,
  61                         lsm->lsm_oinfo[i].loi_id);
  62 }
  63 #endif
  64
  65 static struct ec_object *
  66 echo_find_object_locked (struct obd_device *obd, obd_id id)
  67 {
  68         struct echo_client_obd *ec = &obd->u.echo_client;
  69         struct ec_object       *eco = NULL;
  70         struct list_head       *el;
  71
  72         list_for_each (el, &ec->ec_objects) {
  73                 eco = list_entry (el, struct ec_object, eco_obj_chain);
  74
  75                 if (eco->eco_id == id)
  76                         return (eco);
  77         }
  78         return (NULL);
  79 }
  80
  81 static int
  82 echo_copyout_lsm (struct lov_stripe_md *lsm, void *ulsm, int ulsm_nob)
  83 {
  84         int nob;
  85
  86         nob = offsetof (struct lov_stripe_md, lsm_oinfo[lsm->lsm_stripe_count]);
  87         if (nob > ulsm_nob)
  88                 return (-EINVAL);
  89
  90         if (copy_to_user (ulsm, lsm, nob))
  91                 return (-EFAULT);
  92
  93         return (0);
  94 }
  95
  96 static int
  97 echo_copyin_lsm (struct obd_device *obd, struct lov_stripe_md *lsm,
  98                  void *ulsm, int ulsm_nob)
  99 {
 100         struct echo_client_obd *ec = &obd->u.echo_client;
 101         int                     nob;
 102
 103         if (ulsm_nob < sizeof (*lsm))
 104                 return (-EINVAL);
 105
 106         if (copy_from_user (lsm, ulsm, sizeof (*lsm)))
 107                 return (-EFAULT);
 108
 109         nob = lsm->lsm_stripe_count * sizeof (lsm->lsm_oinfo[0]);
 110
 111         if (ulsm_nob < nob ||
 112             lsm->lsm_stripe_count > ec->ec_nstripes ||
 113             lsm->lsm_magic != LOV_MAGIC ||
 114             (lsm->lsm_stripe_size & (PAGE_SIZE - 1)) != 0 ||
 115             ((__u64)lsm->lsm_stripe_size * lsm->lsm_stripe_count > ~0UL))
 116                 return (-EINVAL);
 117
 118         if (copy_from_user(lsm->lsm_oinfo,
 119                            ((struct lov_stripe_md *)ulsm)->lsm_oinfo, nob))
 120                 return (-EFAULT);
 121
 122         return (0);
 123 }
 124
 125 static struct ec_object *
 126 echo_allocate_object (struct obd_device *obd)
 127 {
 128         struct echo_client_obd *ec = &obd->u.echo_client;
 129         struct ec_object       *eco;
 130         int rc;
 131
 132         OBD_ALLOC(eco, sizeof (*eco));
 133         if (eco == NULL)
 134                 return NULL;
 135
 136         rc = obd_alloc_memmd(ec->ec_exp, &eco->eco_lsm);
 137         if (rc < 0) {
 138                 OBD_FREE(eco, sizeof (*eco));
 139                 return NULL;
 140         }
 141
 142         eco->eco_device = obd;
 143         eco->eco_deleted = 0;
 144         eco->eco_refcount = 0;
 145         eco->eco_lsm->lsm_magic = LOV_MAGIC;
 146         /* leave stripe count 0 by default */
 147
 148         return (eco);
 149 }
 150
 151 static void
 152 echo_free_object (struct ec_object *eco)
 153 {
 154         struct obd_device      *obd = eco->eco_device;
 155         struct echo_client_obd *ec = &obd->u.echo_client;
 156
 157         LASSERT (eco->eco_refcount == 0);
 158         obd_free_memmd(ec->ec_exp, &eco->eco_lsm);
 159         OBD_FREE (eco, sizeof (*eco));
 160 }
 161
 162 static int echo_create_object(struct obd_device *obd, int on_target,
 163                               struct obdo *oa, void *ulsm, int ulsm_nob,
 164                               struct obd_trans_info *oti)
 165 {
 166         struct echo_client_obd *ec = &obd->u.echo_client;
 167         struct ec_object       *eco2;
 168         struct ec_object       *eco;
 169         struct lov_stripe_md   *lsm;
 170         int                     rc;
 171         int                     i, idx;
 172
 173         if ((oa->o_valid & OBD_MD_FLID) == 0 && /* no obj id */
 174             (on_target ||                       /* set_stripe */
 175              ec->ec_nstripes != 0)) {           /* LOV */
 176                 CERROR ("No valid oid\n");
 177                 return (-EINVAL);
 178         }
 179
 180         if (ulsm != NULL) {
 181                 eco = echo_allocate_object (obd);
 182                 if (eco == NULL)
 183                         return (-ENOMEM);
 184
 185                 lsm = eco->eco_lsm;
 186
 187                 rc = echo_copyin_lsm (obd, lsm, ulsm, ulsm_nob);
 188                 if (rc != 0)
 189                         goto failed;
 190
 191                 /* setup object ID here for !on_target and LOV hint */
 192                 if ((oa->o_valid & OBD_MD_FLID) != 0)
 193                         eco->eco_id = lsm->lsm_object_id = oa->o_id;
 194
 195                 if (lsm->lsm_stripe_count == 0)
 196                         lsm->lsm_stripe_count = ec->ec_nstripes;
 197
 198                 if (lsm->lsm_stripe_size == 0)
 199                         lsm->lsm_stripe_size = PAGE_SIZE;
 200
 201                 idx = ll_insecure_random_int();
 202
 203                 /* setup stripes: indices + default ids if required */
 204                 for (i = 0; i < lsm->lsm_stripe_count; i++) {
 205                         if (lsm->lsm_oinfo[i].loi_id == 0)
 206                                 lsm->lsm_oinfo[i].loi_id = lsm->lsm_object_id;
 207
 208                         lsm->lsm_oinfo[i].loi_ost_idx =
 209                                 (idx + i) % ec->ec_nstripes;
 210                 }
 211         } else {
 212                 OBD_ALLOC(eco, sizeof(*eco));
 213                 eco->eco_device = obd;
 214                 lsm = NULL;
 215         }
 216
 217         if (oa->o_id == 0)
 218                 oa->o_id = ++last_object_id;
 219
 220         if (on_target) {
 221                 oa->o_gr = FILTER_GROUP_ECHO;
 222                 oa->o_valid |= OBD_MD_FLGROUP;
 223                 rc = obd_create(ec->ec_exp, oa, &lsm, oti);
 224                 if (rc != 0)
 225                         goto failed;
 226
 227                 /* See what object ID we were given */
 228                 eco->eco_id = oa->o_id = lsm->lsm_object_id;
 229                 oa->o_valid |= OBD_MD_FLID;
 230
 231                 LASSERT(eco->eco_lsm == NULL || eco->eco_lsm == lsm);
 232                 eco->eco_lsm = lsm;
 233         }
 234
 235         spin_lock (&ec->ec_lock);
 236
 237         eco2 = echo_find_object_locked (obd, oa->o_id);
 238         if (eco2 != NULL) {                     /* conflict */
 239                 spin_unlock (&ec->ec_lock);
 240
 241                 CERROR ("Can't create object id "LPX64": id already exists%s\n",
 242                         oa->o_id, on_target ? " (undoing create)" : "");
 243
 244                 if (on_target)
 245                         obd_destroy(ec->ec_exp, oa, lsm, oti);
 246
 247                 rc = -EEXIST;
 248                 goto failed;
 249         }
 250
 251         list_add (&eco->eco_obj_chain, &ec->ec_objects);
 252         spin_unlock (&ec->ec_lock);
 253         CDEBUG (D_INFO,
 254                 "created %p: "LPX64"=%u#%u@%u refs %d del %d\n",
 255                 eco, eco->eco_id,
 256                 eco->eco_lsm->lsm_stripe_size,
 257                 eco->eco_lsm->lsm_stripe_count,
 258                 eco->eco_lsm->lsm_oinfo[0].loi_ost_idx,
 259                 eco->eco_refcount, eco->eco_deleted);
 260         return (0);
 261
 262  failed:
 263         echo_free_object (eco);
 264         return (rc);
 265 }
 266
 267 static int
 268 echo_get_object (struct ec_object **ecop, struct obd_device *obd,
 269                  struct obdo *oa)
 270 {
 271         struct echo_client_obd *ec = &obd->u.echo_client;
 272         struct ec_object       *eco;
 273         struct ec_object       *eco2;
 274         int                     rc;
 275
 276         if ((oa->o_valid & OBD_MD_FLID) == 0 ||
 277             oa->o_id == 0)                      /* disallow use of object id 0 */
 278         {
 279                 CERROR ("No valid oid\n");
 280                 return (-EINVAL);
 281         }
 282
 283         spin_lock (&ec->ec_lock);
 284         eco = echo_find_object_locked (obd, oa->o_id);
 285         if (eco != NULL) {
 286                 if (eco->eco_deleted)           /* being deleted */
 287                         return (-EAGAIN);       /* (see comment in cleanup) */
 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                              struct page *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 == PAGE_SIZE);
 438
 439         addr = kmap(page);
 440
 441         for (delta = 0; delta < 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         kunmap(page);
 455 }
 456
 457 static int
 458 echo_client_page_debug_check(struct lov_stripe_md *lsm,
 459                              struct page *page, obd_id id,
 460                              obd_off offset, obd_off count)
 461 {
 462         obd_off stripe_off;
 463         obd_id  stripe_id;
 464         char   *addr;
 465         int     delta;
 466         int     rc;
 467         int     rc2;
 468
 469         /* no partial pages on the client */
 470         LASSERT(count == PAGE_SIZE);
 471
 472         addr = kmap(page);
 473
 474         for (rc = delta = 0; delta < PAGE_SIZE; delta += OBD_ECHO_BLOCK_SIZE) {
 475                 stripe_off = offset + delta;
 476                 stripe_id = id;
 477                 echo_get_stripe_off_id (lsm, &stripe_off, &stripe_id);
 478
 479                 rc2 = block_debug_check("test_brw",
 480                                         addr + delta, OBD_ECHO_BLOCK_SIZE,
 481                                         stripe_off, stripe_id);
 482                 if (rc2 != 0)
 483                         rc = rc2;
 484         }
 485
 486         kunmap(page);
 487         return rc;
 488 }
 489
 490 static int echo_client_kbrw(struct obd_device *obd, int rw, struct obdo *oa,
 491                             struct lov_stripe_md *lsm, obd_off offset,
 492                             obd_size count, struct obd_trans_info *oti)
 493 {
 494         struct echo_client_obd *ec = &obd->u.echo_client;
 495         obd_count               npages;
 496         struct brw_page        *pga;
 497         struct brw_page        *pgp;
 498         obd_off                 off;
 499         int                     i;
 500         int                     rc;
 501         int                     verify = 0;
 502         int                     gfp_mask;
 503
 504         /* oa_id == ECHO_PERSISTENT_OBJID => speed test (no verification).
 505          * oa & 1                         => use HIGHMEM */
 506
 507         verify = (oa->o_id) != ECHO_PERSISTENT_OBJID;
 508         gfp_mask = ((oa->o_id & 2) == 0) ? GFP_KERNEL : GFP_HIGHUSER;
 509
 510         LASSERT(rw == OBD_BRW_WRITE || rw == OBD_BRW_READ);
 511
 512         if (count <= 0 ||
 513             (count & (PAGE_SIZE - 1)) != 0 ||
 514             (lsm != NULL &&
 515              lsm->lsm_object_id != oa->o_id))
 516                 return (-EINVAL);
 517
 518         /* XXX think again with misaligned I/O */
 519         npages = count >> PAGE_SHIFT;
 520
 521         OBD_ALLOC(pga, npages * sizeof(*pga));
 522         if (pga == NULL)
 523                 return (-ENOMEM);
 524
 525         for (i = 0, pgp = pga, off = offset;
 526              i < npages;
 527              i++, pgp++, off += PAGE_SIZE) {
 528
 529                 LASSERT (pgp->pg == NULL);      /* for cleanup */
 530
 531                 rc = -ENOMEM;
 532                 pgp->pg = alloc_pages (gfp_mask, 0);
 533                 if (pgp->pg == NULL)
 534                         goto out;
 535
 536                 pgp->count = PAGE_SIZE;
 537                 pgp->off = off;
 538                 pgp->flag = 0;
 539
 540                 if (verify)
 541                         echo_client_page_debug_setup(lsm, pgp->pg, rw,
 542                                                      oa->o_id, off, pgp->count);
 543         }
 544
 545         rc = obd_brw(rw, ec->ec_exp, oa, lsm, npages, pga, oti);
 546
 547  out:
 548         if (rc != 0 || rw != OBD_BRW_READ)
 549                 verify = 0;
 550
 551         for (i = 0, pgp = pga; i < npages; i++, pgp++) {
 552                 if (pgp->pg == NULL)
 553                         continue;
 554
 555                 if (verify) {
 556                         int vrc;
 557                         vrc = echo_client_page_debug_check(lsm, pgp->pg, oa->o_id,
 558                                                            pgp->off, pgp->count);
 559                         if (vrc != 0 && rc == 0)
 560                                 rc = vrc;
 561                 }
 562                 __free_pages(pgp->pg, 0);
 563         }
 564         OBD_FREE(pga, npages * sizeof(*pga));
 565         return (rc);
 566 }
 567
 568 #ifdef __KERNEL__
 569 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 570 static int echo_client_ubrw(struct obd_device *obd, int rw,
 571                             struct obdo *oa, struct lov_stripe_md *lsm,
 572                             obd_off offset, obd_size count, char *buffer,
 573                             struct obd_trans_info *oti)
 574 {
 575         struct echo_client_obd *ec = &obd->u.echo_client;
 576         obd_count               npages;
 577         struct brw_page        *pga;
 578         struct brw_page        *pgp;
 579         obd_off                 off;
 580         struct kiobuf          *kiobuf;
 581         int                     i;
 582         int                     rc;
 583
 584         LASSERT (rw == OBD_BRW_WRITE ||
 585                  rw == OBD_BRW_READ);
 586
 587         /* NB: for now, only whole pages, page aligned */
 588
 589         if (count <= 0 ||
 590             ((long)buffer & (PAGE_SIZE - 1)) != 0 ||
 591             (count & (PAGE_SIZE - 1)) != 0 ||
 592             (lsm != NULL && lsm->lsm_object_id != oa->o_id))
 593                 return (-EINVAL);
 594
 595         /* XXX think again with misaligned I/O */
 596         npages = count >> PAGE_SHIFT;
 597
 598         OBD_ALLOC(pga, npages * sizeof(*pga));
 599         if (pga == NULL)
 600                 return (-ENOMEM);
 601
 602         rc = alloc_kiovec (1, &kiobuf);
 603         if (rc != 0)
 604                 goto out_1;
 605
 606         rc = map_user_kiobuf ((rw == OBD_BRW_READ) ? READ : WRITE,
 607                               kiobuf, (unsigned long)buffer, count);
 608         if (rc != 0)
 609                 goto out_2;
 610
 611         LASSERT (kiobuf->offset == 0);
 612         LASSERT (kiobuf->nr_pages == npages);
 613
 614         for (i = 0, off = offset, pgp = pga;
 615              i < npages;
 616              i++, off += PAGE_SIZE, pgp++) {
 617                 pgp->off = off;
 618                 pgp->pg = kiobuf->maplist[i];
 619                 pgp->count = PAGE_SIZE;
 620                 pgp->flag = 0;
 621         }
 622
 623         rc = obd_brw(rw, ec->ec_exp, oa, lsm, npages, pga, oti);
 624
 625         //        if (rw == OBD_BRW_READ)
 626         //                mark_dirty_kiobuf (kiobuf, count);
 627
 628         unmap_kiobuf (kiobuf);
 629  out_2:
 630         free_kiovec (1, &kiobuf);
 631  out_1:
 632         OBD_FREE(pga, npages * sizeof(*pga));
 633         return (rc);
 634 }
 635 #else
 636 static int echo_client_ubrw(struct obd_device *obd, int rw,
 637                             struct obdo *oa, struct lov_stripe_md *lsm,
 638                             obd_off offset, obd_size count, char *buffer,
 639                             struct obd_trans_info *oti)
 640 {
 641 #warning "echo_client_ubrw() needs to be ported on 2.6 yet"
 642         LBUG();
 643         return 0;
 644 }
 645 #endif
 646 #endif
 647
 648 struct echo_async_state;
 649
 650 #define EAP_MAGIC 79277927
 651 struct echo_async_page {
 652         int                     eap_magic;
 653         struct page             *eap_page;
 654         void                    *eap_cookie;
 655         obd_off                 eap_off;
 656         struct echo_async_state *eap_eas;
 657         struct list_head        eap_item;
 658 };
 659
 660 struct echo_async_state {
 661         spinlock_t              eas_lock;
 662         obd_off                 eas_next_offset;
 663         obd_off                 eas_end_offset;
 664         int                     eas_in_flight;
 665         int                     eas_rc;
 666         wait_queue_head_t       eas_waitq;
 667         struct list_head        eas_avail;
 668         struct obdo             eas_oa;
 669         struct lov_stripe_md    *eas_lsm;
 670 };
 671
 672 static int eas_should_wake(struct echo_async_state *eas)
 673 {
 674         unsigned long flags;
 675         int rc = 0;
 676         spin_lock_irqsave(&eas->eas_lock, flags);
 677         if (eas->eas_rc == 0 && !list_empty(&eas->eas_avail))
 678             rc = 1;
 679         spin_unlock_irqrestore(&eas->eas_lock, flags);
 680         return rc;
 681 };
 682
 683 struct echo_async_page *eap_from_cookie(void *cookie)
 684 {
 685         struct echo_async_page *eap = cookie;
 686         if (eap->eap_magic != EAP_MAGIC)
 687                 return ERR_PTR(-EINVAL);
 688         return eap;
 689 };
 690
 691 static int ec_ap_make_ready(void *data, int cmd)
 692 {
 693         /* our pages are issued ready */
 694         LBUG();
 695         return 0;
 696 }
 697 static int ec_ap_refresh_count(void *data, int cmd)
 698 {
 699         /* our pages are issued with a stable count */
 700         LBUG();
 701         return PAGE_SIZE;
 702 }
 703 static void ec_ap_fill_obdo(void *data, int cmd, struct obdo *oa)
 704 {
 705         struct echo_async_page *eap;
 706         eap = eap_from_cookie(data);
 707         if (IS_ERR(eap))
 708                 return;
 709
 710         memcpy(oa, &eap->eap_eas->eas_oa, sizeof(*oa));
 711 }
 712 static void ec_ap_completion(void *data, int cmd, int rc)
 713 {
 714         struct echo_async_page *eap = eap_from_cookie(data);
 715         struct echo_async_state *eas;
 716         unsigned long flags;
 717
 718         if (IS_ERR(eap))
 719                 return;
 720         eas = eap->eap_eas;
 721
 722         if (cmd == OBD_BRW_READ &&
 723             eas->eas_oa.o_id != ECHO_PERSISTENT_OBJID)
 724                 echo_client_page_debug_check(eas->eas_lsm, eap->eap_page,
 725                                              eas->eas_oa.o_id, eap->eap_off,
 726                                              PAGE_SIZE);
 727
 728         spin_lock_irqsave(&eas->eas_lock, flags);
 729         if (rc && !eas->eas_rc)
 730                 eas->eas_rc = rc;
 731         eas->eas_in_flight--;
 732         list_add(&eap->eap_item, &eas->eas_avail);
 733         wake_up(&eas->eas_waitq);
 734         spin_unlock_irqrestore(&eas->eas_lock, flags);
 735 }
 736
 737 static struct obd_async_page_ops ec_async_page_ops = {
 738         .ap_make_ready =        ec_ap_make_ready,
 739         .ap_refresh_count =     ec_ap_refresh_count,
 740         .ap_fill_obdo =         ec_ap_fill_obdo,
 741         .ap_completion =        ec_ap_completion,
 742 };
 743
 744 static int echo_client_async_page(struct obd_export *exp, int rw,
 745                                    struct obdo *oa, struct lov_stripe_md *lsm,
 746                                    obd_off offset, obd_size count,
 747                                    obd_size batching)
 748 {
 749         obd_count npages, i;
 750         struct echo_async_page *eap;
 751         struct echo_async_state eas;
 752         struct list_head *pos, *n;
 753         int rc = 0;
 754         unsigned long flags;
 755         LIST_HEAD(pages);
 756 #if 0
 757         int                     verify;
 758         int                     gfp_mask;
 759         /* oa_id  == 0    => speed test (no verification) else...
 760          * oa & 1         => use HIGHMEM
 761          */
 762         verify = (oa->o_id != 0);
 763         gfp_mask = ((oa->o_id & 1) == 0) ? GFP_KERNEL : GFP_HIGHUSER;
 764 #endif
 765
 766         LASSERT(rw == OBD_BRW_WRITE || rw == OBD_BRW_READ);
 767
 768         if (count <= 0 ||
 769             (count & (PAGE_SIZE - 1)) != 0 ||
 770             (lsm != NULL &&
 771              lsm->lsm_object_id != oa->o_id))
 772                 return (-EINVAL);
 773
 774         /* XXX think again with misaligned I/O */
 775         npages = batching >> PAGE_SHIFT;
 776
 777         memcpy(&eas.eas_oa, oa, sizeof(*oa));
 778         eas.eas_next_offset = offset;
 779         eas.eas_end_offset = offset + count;
 780         spin_lock_init(&eas.eas_lock);
 781         init_waitqueue_head(&eas.eas_waitq);
 782         eas.eas_in_flight = 0;
 783         eas.eas_rc = 0;
 784         eas.eas_lsm = lsm;
 785         INIT_LIST_HEAD(&eas.eas_avail);
 786
 787         /* prepare the group of pages that we're going to be keeping
 788          * in flight */
 789         for (i = 0; i < npages; i++) {
 790                 struct page *page = alloc_page(GFP_KERNEL);
 791                 if (page == NULL)
 792                         GOTO(out, rc = -ENOMEM);
 793
 794                 page->private = 0;
 795                 list_add_tail(&page->list, &pages);
 796
 797                 OBD_ALLOC(eap, sizeof(*eap));
 798                 if (eap == NULL)
 799                         GOTO(out, rc = -ENOMEM);
 800
 801                 eap->eap_magic = EAP_MAGIC;
 802                 eap->eap_page = page;
 803                 eap->eap_eas = &eas;
 804                 page->private = (unsigned long)eap;
 805                 list_add_tail(&eap->eap_item, &eas.eas_avail);
 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 += 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                         echo_client_page_debug_setup(lsm, eap->eap_page, rw,
 850                                                      oa->o_id,
 851                                                      eap->eap_off, PAGE_SIZE);
 852
 853                 /* always asserts urgent, which isn't quite right */
 854                 rc = obd_queue_async_io(exp, lsm, NULL, eap->eap_cookie,
 855                                         rw, 0, PAGE_SIZE, 0,
 856                                         ASYNC_READY | ASYNC_URGENT |
 857                                         ASYNC_COUNT_STABLE);
 858                 spin_lock_irqsave(&eas.eas_lock, flags);
 859                 if (rc && !eas.eas_rc) {
 860                         eas.eas_rc = rc;
 861                         break;
 862                 }
 863                 eas.eas_in_flight++;
 864                 if (eas.eas_next_offset == eas.eas_end_offset)
 865                         break;
 866         }
 867
 868         /* still hold the eas_lock here.. */
 869
 870         /* now we just spin waiting for all the rpcs to complete */
 871         while(eas.eas_in_flight) {
 872                 spin_unlock_irqrestore(&eas.eas_lock, flags);
 873                 wait_event_interruptible(eas.eas_waitq,
 874                                          eas.eas_in_flight == 0);
 875                 spin_lock_irqsave(&eas.eas_lock, flags);
 876         }
 877         spin_unlock_irqrestore(&eas.eas_lock, flags);
 878
 879 out:
 880         list_for_each_safe(pos, n, &pages) {
 881                 struct page *page = list_entry(pos, struct page, list);
 882
 883                 list_del(&page->list);
 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                                 continue;
 953
 954                         if (rw == OBD_BRW_WRITE)
 955                                 echo_client_page_debug_setup(lsm, page, rw,
 956                                                              oa->o_id,
 957                                                              rnb[i].offset,
 958                                                              rnb[i].len);
 959                         else
 960                                 echo_client_page_debug_check(lsm, page,
 961                                                              oa->o_id,
 962                                                              rnb[i].offset,
 963                                                              rnb[i].len);
 964                 }
 965
 966                 ret = obd_commitrw(rw, exp, oa, 1, &ioo, npages, lnb, oti, ret);
 967                 if (ret != 0)
 968                         GOTO(out, ret);
 969         }
 970
 971 out:
 972         if (lnb)
 973                 OBD_FREE(lnb, npages * sizeof(struct niobuf_local));
 974         if (rnb)
 975                 OBD_FREE(rnb, npages * sizeof(struct niobuf_remote));
 976         RETURN(ret);
 977 }
 978
 979 int echo_client_brw_ioctl(int rw, struct obd_export *exp,
 980                           struct obd_ioctl_data *data)
 981 {
 982         struct obd_device *obd = class_exp2obd(exp);
 983         struct echo_client_obd *ec = &obd->u.echo_client;
 984         struct obd_trans_info dummy_oti;
 985         struct ec_object *eco;
 986         int rc;
 987         ENTRY;
 988
 989         rc = echo_get_object(&eco, obd, &data->ioc_obdo1);
 990         if (rc)
 991                 RETURN(rc);
 992
 993         memset(&dummy_oti, 0, sizeof(dummy_oti));
 994
 995         data->ioc_obdo1.o_valid &= ~OBD_MD_FLHANDLE;
 996         data->ioc_obdo1.o_valid |= OBD_MD_FLGROUP;
 997         data->ioc_obdo1.o_gr = FILTER_GROUP_ECHO;
 998
 999         switch((long)data->ioc_pbuf1) {
1000         case 1:
1001                 if (data->ioc_pbuf2 == NULL) { // NULL user data pointer
1002                         rc = echo_client_kbrw(obd, rw, &data->ioc_obdo1,
1003                                               eco->eco_lsm, data->ioc_offset,
1004                                               data->ioc_count, &dummy_oti);
1005                 } else {
1006 #ifdef __KERNEL__
1007                         rc = echo_client_ubrw(obd, rw, &data->ioc_obdo1,
1008                                               eco->eco_lsm, data->ioc_offset,
1009                                               data->ioc_count, data->ioc_pbuf2,
1010                                               &dummy_oti);
1011 #endif
1012                 }
1013                 break;
1014         case 2:
1015                 rc = echo_client_async_page(ec->ec_exp, rw, &data->ioc_obdo1,
1016                                            eco->eco_lsm, data->ioc_offset,
1017                                            data->ioc_count, data->ioc_plen1);
1018                 break;
1019         case 3:
1020                 rc = echo_client_prep_commit(ec->ec_exp, rw, &data->ioc_obdo1,
1021                                             eco->eco_lsm, data->ioc_offset,
1022                                             data->ioc_count, data->ioc_plen1,
1023                                             &dummy_oti);
1024                 break;
1025         default:
1026                 rc = -EINVAL;
1027         }
1028         echo_put_object(eco);
1029         RETURN(rc);
1030 }
1031
1032 static int
1033 echo_ldlm_callback (struct ldlm_lock *lock, struct ldlm_lock_desc *new,
1034                     void *data, int flag)
1035 {
1036         struct ec_object       *eco = (struct ec_object *)data;
1037         struct echo_client_obd *ec = &(eco->eco_device->u.echo_client);
1038         struct lustre_handle    lockh;
1039         struct list_head       *el;
1040         int                     found = 0;
1041         int                     rc;
1042
1043         ldlm_lock2handle (lock, &lockh);
1044
1045         /* #ifdef this out if we're not feeling paranoid */
1046         spin_lock (&ec->ec_lock);
1047         list_for_each (el, &ec->ec_objects) {
1048                 found = (eco == list_entry(el, struct ec_object,
1049                                            eco_obj_chain));
1050                 if (found)
1051                         break;
1052         }
1053         spin_unlock (&ec->ec_lock);
1054         LASSERT (found);
1055
1056         switch (flag) {
1057         case LDLM_CB_BLOCKING:
1058                 CDEBUG(D_INFO, "blocking callback on "LPX64", handle "LPX64"\n",
1059                        eco->eco_id, lockh.cookie);
1060                 rc = ldlm_cli_cancel (&lockh);
1061                 if (rc != ELDLM_OK)
1062                         CERROR ("ldlm_cli_cancel failed: %d\n", rc);
1063                 break;
1064
1065         case LDLM_CB_CANCELING:
1066                 CDEBUG(D_INFO, "cancel callback on "LPX64", handle "LPX64"\n",
1067                        eco->eco_id, lockh.cookie);
1068                 break;
1069
1070         default:
1071                 LBUG ();
1072         }
1073
1074         return (0);
1075 }
1076
1077 static int
1078 echo_client_enqueue(struct obd_export *exp, struct obdo *oa,
1079                     int mode, obd_off offset, obd_size nob)
1080 {
1081         struct obd_device      *obd = exp->exp_obd;
1082         struct echo_client_obd *ec = &obd->u.echo_client;
1083         struct lustre_handle   *ulh = obdo_handle (oa);
1084         struct ec_object       *eco;
1085         struct ec_lock         *ecl;
1086         int                     flags;
1087         int                     rc;
1088
1089         if (!(mode == LCK_PR || mode == LCK_PW))
1090                 return -EINVAL;
1091
1092         if ((offset & (PAGE_SIZE - 1)) != 0 ||
1093             (nob & (PAGE_SIZE - 1)) != 0)
1094                 return -EINVAL;
1095
1096         rc = echo_get_object (&eco, obd, oa);
1097         if (rc != 0)
1098                 return rc;
1099
1100         rc = -ENOMEM;
1101         OBD_ALLOC (ecl, sizeof (*ecl));
1102         if (ecl == NULL)
1103                 goto failed_0;
1104
1105         ecl->ecl_mode = mode;
1106         ecl->ecl_object = eco;
1107         ecl->ecl_policy.l_extent.start = offset;
1108         ecl->ecl_policy.l_extent.end =
1109                 (nob == 0) ? ((obd_off) -1) : (offset + nob - 1);
1110
1111         flags = 0;
1112         rc = obd_enqueue(ec->ec_exp, eco->eco_lsm, LDLM_EXTENT,
1113                          &ecl->ecl_policy, mode, &flags, echo_ldlm_callback,
1114                          ldlm_completion_ast, NULL, eco, sizeof(struct ost_lvb),
1115                          lustre_swab_ost_lvb, &ecl->ecl_lock_handle);
1116         if (rc != 0)
1117                 goto failed_1;
1118
1119         CDEBUG(D_INFO, "enqueue handle "LPX64"\n", ecl->ecl_lock_handle.cookie);
1120
1121         /* NB ecl takes object ref from echo_get_object() above */
1122         spin_lock(&ec->ec_lock);
1123
1124         list_add(&ecl->ecl_exp_chain, &exp->exp_ec_data.eced_locks);
1125         ulh->cookie = ecl->ecl_cookie = ec->ec_unique++;
1126
1127         spin_unlock(&ec->ec_lock);
1128
1129         oa->o_valid |= OBD_MD_FLHANDLE;
1130         return 0;
1131
1132  failed_1:
1133         OBD_FREE (ecl, sizeof (*ecl));
1134  failed_0:
1135         echo_put_object (eco);
1136         return (rc);
1137 }
1138
1139 static int
1140 echo_client_cancel(struct obd_export *exp, struct obdo *oa)
1141 {
1142         struct obd_device      *obd = exp->exp_obd;
1143         struct echo_client_obd *ec = &obd->u.echo_client;
1144         struct lustre_handle   *ulh = obdo_handle (oa);
1145         struct ec_lock         *ecl = NULL;
1146         int                     found = 0;
1147         struct list_head       *el;
1148         int                     rc;
1149
1150         if ((oa->o_valid & OBD_MD_FLHANDLE) == 0)
1151                 return -EINVAL;
1152
1153         spin_lock (&ec->ec_lock);
1154
1155         list_for_each (el, &exp->exp_ec_data.eced_locks) {
1156                 ecl = list_entry (el, struct ec_lock, ecl_exp_chain);
1157                 found = (ecl->ecl_cookie == ulh->cookie);
1158                 if (found) {
1159                         list_del (&ecl->ecl_exp_chain);
1160                         break;
1161                 }
1162         }
1163
1164         spin_unlock (&ec->ec_lock);
1165
1166         if (!found)
1167                 return (-ENOENT);
1168
1169         rc = obd_cancel(ec->ec_exp, ecl->ecl_object->eco_lsm, ecl->ecl_mode,
1170                         &ecl->ecl_lock_handle);
1171
1172         echo_put_object (ecl->ecl_object);
1173         OBD_FREE (ecl, sizeof (*ecl));
1174
1175         return rc;
1176 }
1177
1178 static int
1179 echo_client_iocontrol(unsigned int cmd, struct obd_export *exp,
1180                       int len, void *karg, void *uarg)
1181 {
1182         struct obd_device      *obd;
1183         struct echo_client_obd *ec;
1184         struct ec_object       *eco;
1185         struct obd_ioctl_data  *data = karg;
1186         struct obd_trans_info   dummy_oti;
1187         struct oti_req_ack_lock *ack_lock;
1188         struct obdo            *oa;
1189         int                     rw = OBD_BRW_READ;
1190         int                     rc = 0;
1191         int                     i;
1192         ENTRY;
1193
1194         memset(&dummy_oti, 0, sizeof(dummy_oti));
1195
1196         obd = exp->exp_obd;
1197         ec = &obd->u.echo_client;
1198
1199         switch (cmd) {
1200         case OBD_IOC_CREATE:                    /* may create echo object */
1201                 if (!capable (CAP_SYS_ADMIN))
1202                         GOTO (out, rc = -EPERM);
1203
1204                 rc = echo_create_object (obd, 1, &data->ioc_obdo1,
1205                                          data->ioc_pbuf1, data->ioc_plen1,
1206                                          &dummy_oti);
1207                 GOTO(out, rc);
1208
1209         case OBD_IOC_DESTROY:
1210                 if (!capable (CAP_SYS_ADMIN))
1211                         GOTO (out, rc = -EPERM);
1212
1213                 rc = echo_get_object (&eco, obd, &data->ioc_obdo1);
1214                 if (rc == 0) {
1215                         oa = &data->ioc_obdo1;
1216                         oa->o_gr = FILTER_GROUP_ECHO;
1217                         oa->o_valid |= OBD_MD_FLGROUP;
1218                         rc = obd_destroy(ec->ec_exp, oa, eco->eco_lsm,
1219                                          &dummy_oti);
1220                         if (rc == 0)
1221                                 eco->eco_deleted = 1;
1222                         echo_put_object(eco);
1223                 }
1224                 GOTO(out, rc);
1225
1226         case OBD_IOC_GETATTR:
1227                 rc = echo_get_object (&eco, obd, &data->ioc_obdo1);
1228                 if (rc == 0) {
1229                         rc = obd_getattr(ec->ec_exp, &data->ioc_obdo1,
1230                                          eco->eco_lsm);
1231                         echo_put_object(eco);
1232                 }
1233                 GOTO(out, rc);
1234
1235         case OBD_IOC_SETATTR:
1236                 if (!capable (CAP_SYS_ADMIN))
1237                         GOTO (out, rc = -EPERM);
1238
1239                 rc = echo_get_object (&eco, obd, &data->ioc_obdo1);
1240                 if (rc == 0) {
1241                         rc = obd_setattr(ec->ec_exp, &data->ioc_obdo1,
1242                                          eco->eco_lsm, NULL);
1243                         echo_put_object(eco);
1244                 }
1245                 GOTO(out, rc);
1246
1247         case OBD_IOC_BRW_WRITE:
1248                 if (!capable (CAP_SYS_ADMIN))
1249                         GOTO (out, rc = -EPERM);
1250
1251                 rw = OBD_BRW_WRITE;
1252                 /* fall through */
1253         case OBD_IOC_BRW_READ:
1254                 rc = echo_client_brw_ioctl(rw, exp, data);
1255                 GOTO(out, rc);
1256
1257         case ECHO_IOC_GET_STRIPE:
1258                 rc = echo_get_object(&eco, obd, &data->ioc_obdo1);
1259                 if (rc == 0) {
1260                         rc = echo_copyout_lsm(eco->eco_lsm, data->ioc_pbuf1,
1261                                               data->ioc_plen1);
1262                         echo_put_object(eco);
1263                 }
1264                 GOTO(out, rc);
1265
1266         case ECHO_IOC_SET_STRIPE:
1267                 if (!capable (CAP_SYS_ADMIN))
1268                         GOTO (out, rc = -EPERM);
1269
1270                 if (data->ioc_pbuf1 == NULL) {  /* unset */
1271                         rc = echo_get_object(&eco, obd, &data->ioc_obdo1);
1272                         if (rc == 0) {
1273                                 eco->eco_deleted = 1;
1274                                 echo_put_object(eco);
1275                         }
1276                 } else {
1277                         rc = echo_create_object(obd, 0, &data->ioc_obdo1,
1278                                                 data->ioc_pbuf1,
1279                                                 data->ioc_plen1, &dummy_oti);
1280                 }
1281                 GOTO (out, rc);
1282
1283         case ECHO_IOC_ENQUEUE:
1284                 if (!capable (CAP_SYS_ADMIN))
1285                         GOTO (out, rc = -EPERM);
1286
1287                 rc = echo_client_enqueue(exp, &data->ioc_obdo1,
1288                                          data->ioc_conn1, /* lock mode */
1289                                    data->ioc_offset, data->ioc_count);/*extent*/
1290                 GOTO (out, rc);
1291
1292         case ECHO_IOC_CANCEL:
1293                 rc = echo_client_cancel(exp, &data->ioc_obdo1);
1294                 GOTO (out, rc);
1295
1296         default:
1297                 CERROR ("echo_ioctl(): unrecognised ioctl %#x\n", cmd);
1298                 GOTO (out, rc = -ENOTTY);
1299         }
1300
1301         EXIT;
1302  out:
1303
1304         /* XXX this should be in a helper also called by target_send_reply */
1305         for (ack_lock = dummy_oti.oti_ack_locks, i = 0; i < 4;
1306              i++, ack_lock++) {
1307                 if (!ack_lock->mode)
1308                         break;
1309                 ldlm_lock_decref(&ack_lock->lock, ack_lock->mode);
1310         }
1311
1312         return rc;
1313 }
1314
1315 static int
1316 echo_client_setup(struct obd_device *obddev, obd_count len, void *buf)
1317 {
1318         struct lustre_cfg* lcfg = buf;
1319         struct echo_client_obd *ec = &obddev->u.echo_client;
1320         struct obd_device *tgt;
1321         struct lustre_handle conn = {0, };
1322         struct obd_uuid echo_uuid = { "ECHO_UUID" };
1323         int rc;
1324         ENTRY;
1325
1326         if (lcfg->lcfg_inllen1 < 1) {
1327                 CERROR("requires a TARGET OBD name\n");
1328                 RETURN(-EINVAL);
1329         }
1330
1331         tgt = class_name2obd(lcfg->lcfg_inlbuf1);
1332         if (!tgt || !tgt->obd_attached || !tgt->obd_set_up) {
1333                 CERROR("device not attached or not set up (%s)\n",
1334                        lcfg->lcfg_inlbuf1);
1335                 RETURN(-EINVAL);
1336         }
1337
1338         spin_lock_init (&ec->ec_lock);
1339         INIT_LIST_HEAD (&ec->ec_objects);
1340         ec->ec_unique = 0;
1341
1342         rc = obd_connect(&conn, tgt, &echo_uuid);
1343         if (rc) {
1344                 CERROR("fail to connect to device %s\n", lcfg->lcfg_inlbuf1);
1345                 return (rc);
1346         }
1347         ec->ec_exp = class_conn2export(&conn);
1348
1349         RETURN(rc);
1350 }
1351
1352 static int echo_client_cleanup(struct obd_device *obddev, int flags)
1353 {
1354         struct list_head       *el;
1355         struct ec_object       *eco;
1356         struct echo_client_obd *ec = &obddev->u.echo_client;
1357         int rc;
1358         ENTRY;
1359
1360         if (!list_empty(&obddev->obd_exports)) {
1361                 CERROR("still has clients!\n");
1362                 RETURN(-EBUSY);
1363         }
1364
1365         /* XXX assuming sole access */
1366         while (!list_empty(&ec->ec_objects)) {
1367                 el = ec->ec_objects.next;
1368                 eco = list_entry(el, struct ec_object, eco_obj_chain);
1369
1370                 LASSERT(eco->eco_refcount == 0);
1371                 eco->eco_refcount = 1;
1372                 eco->eco_deleted = 1;
1373                 echo_put_object(eco);
1374         }
1375
1376         rc = obd_disconnect(ec->ec_exp, 0);
1377         if (rc != 0)
1378                 CERROR("fail to disconnect device: %d\n", rc);
1379
1380         RETURN(rc);
1381 }
1382
1383 static int echo_client_connect(struct lustre_handle *conn,
1384                                struct obd_device *src, struct obd_uuid *cluuid)
1385 {
1386         struct obd_export *exp;
1387         int                rc;
1388
1389         rc = class_connect(conn, src, cluuid);
1390         if (rc == 0) {
1391                 exp = class_conn2export(conn);
1392                 INIT_LIST_HEAD(&exp->exp_ec_data.eced_locks);
1393                 class_export_put(exp);
1394         }
1395
1396         RETURN (rc);
1397 }
1398
1399 static int echo_client_disconnect(struct obd_export *exp, int flags)
1400 {
1401         struct obd_device      *obd;
1402         struct echo_client_obd *ec;
1403         struct ec_lock         *ecl;
1404         int                     rc;
1405         ENTRY;
1406
1407         if (exp == NULL)
1408                 GOTO(out, rc = -EINVAL);
1409
1410         obd = exp->exp_obd;
1411         ec = &obd->u.echo_client;
1412
1413         /* no more contention on export's lock list */
1414         while (!list_empty (&exp->exp_ec_data.eced_locks)) {
1415                 ecl = list_entry (exp->exp_ec_data.eced_locks.next,
1416                                   struct ec_lock, ecl_exp_chain);
1417                 list_del (&ecl->ecl_exp_chain);
1418
1419                 rc = obd_cancel(ec->ec_exp, ecl->ecl_object->eco_lsm,
1420                                  ecl->ecl_mode, &ecl->ecl_lock_handle);
1421
1422                 CDEBUG (D_INFO, "Cancel lock on object "LPX64" on disconnect "
1423                         "(%d)\n", ecl->ecl_object->eco_id, rc);
1424
1425                 echo_put_object (ecl->ecl_object);
1426                 OBD_FREE (ecl, sizeof (*ecl));
1427         }
1428
1429         rc = class_disconnect(exp, 0);
1430         GOTO(out, rc);
1431  out:
1432         return rc;
1433 }
1434
1435 static struct obd_ops echo_obd_ops = {
1436         o_owner:       THIS_MODULE,
1437         o_setup:       echo_client_setup,
1438         o_cleanup:     echo_client_cleanup,
1439         o_iocontrol:   echo_client_iocontrol,
1440         o_connect:     echo_client_connect,
1441         o_disconnect:  echo_client_disconnect
1442 };
1443
1444 int echo_client_init(void)
1445 {
1446         struct lprocfs_static_vars lvars;
1447
1448         lprocfs_init_vars(echo, &lvars);
1449         return class_register_type(&echo_obd_ops, NULL, lvars.module_vars,
1450                                    OBD_ECHO_CLIENT_DEVICENAME);
1451 }
1452
1453 void echo_client_exit(void)
1454 {
1455         class_unregister_type(OBD_ECHO_CLIENT_DEVICENAME);
1456 }