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                 /* XXX get some filter group constants */
 222                 oa->o_gr = 2;
 223                 oa->o_valid |= OBD_MD_FLGROUP;
 224                 rc = obd_create(ec->ec_exp, oa, &lsm, oti);
 225                 if (rc != 0)
 226                         goto failed;
 227
 228                 /* See what object ID we were given */
 229                 eco->eco_id = oa->o_id = lsm->lsm_object_id;
 230                 oa->o_valid |= OBD_MD_FLID;
 231
 232                 LASSERT(eco->eco_lsm == NULL || eco->eco_lsm == lsm);
 233                 eco->eco_lsm = lsm;
 234         }
 235
 236         spin_lock (&ec->ec_lock);
 237
 238         eco2 = echo_find_object_locked (obd, oa->o_id);
 239         if (eco2 != NULL) {                     /* conflict */
 240                 spin_unlock (&ec->ec_lock);
 241
 242                 CERROR ("Can't create object id "LPX64": id already exists%s\n",
 243                         oa->o_id, on_target ? " (undoing create)" : "");
 244
 245                 if (on_target)
 246                         obd_destroy(ec->ec_exp, oa, lsm, oti);
 247
 248                 rc = -EEXIST;
 249                 goto failed;
 250         }
 251
 252         list_add (&eco->eco_obj_chain, &ec->ec_objects);
 253         spin_unlock (&ec->ec_lock);
 254         CDEBUG (D_INFO,
 255                 "created %p: "LPX64"=%u#%u@%u refs %d del %d\n",
 256                 eco, eco->eco_id,
 257                 eco->eco_lsm->lsm_stripe_size,
 258                 eco->eco_lsm->lsm_stripe_count,
 259                 eco->eco_lsm->lsm_oinfo[0].loi_ost_idx,
 260                 eco->eco_refcount, eco->eco_deleted);
 261         return (0);
 262
 263  failed:
 264         echo_free_object (eco);
 265         return (rc);
 266 }
 267
 268 static int
 269 echo_get_object (struct ec_object **ecop, struct obd_device *obd,
 270                  struct obdo *oa)
 271 {
 272         struct echo_client_obd *ec = &obd->u.echo_client;
 273         struct ec_object       *eco;
 274         struct ec_object       *eco2;
 275         int                     rc;
 276
 277         if ((oa->o_valid & OBD_MD_FLID) == 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 int echo_client_kbrw(struct obd_device *obd, int rw, struct obdo *oa,
 427                             struct lov_stripe_md *lsm, obd_off offset,
 428                             obd_size count, struct obd_trans_info *oti)
 429 {
 430         struct echo_client_obd *ec = &obd->u.echo_client;
 431         obd_count               npages;
 432         struct brw_page        *pga;
 433         struct brw_page        *pgp;
 434         obd_off                 off;
 435         int                     i;
 436         int                     rc;
 437         int                     verify;
 438         int                     gfp_mask;
 439
 440         /* oa_id  == 0    => speed test (no verification) else...
 441          * oa & 1         => use HIGHMEM
 442          */
 443         verify = (oa->o_id != 0);
 444         gfp_mask = ((oa->o_id & 1) == 0) ? GFP_KERNEL : GFP_HIGHUSER;
 445
 446         LASSERT(rw == OBD_BRW_WRITE || rw == OBD_BRW_READ);
 447
 448         if (count <= 0 ||
 449             (count & (PAGE_SIZE - 1)) != 0 ||
 450             (lsm != NULL &&
 451              lsm->lsm_object_id != oa->o_id))
 452                 return (-EINVAL);
 453
 454         /* XXX think again with misaligned I/O */
 455         npages = count >> PAGE_SHIFT;
 456
 457         OBD_ALLOC(pga, npages * sizeof(*pga));
 458         if (pga == NULL)
 459                 return (-ENOMEM);
 460
 461         for (i = 0, pgp = pga, off = offset;
 462              i < npages;
 463              i++, pgp++, off += PAGE_SIZE) {
 464
 465                 LASSERT (pgp->pg == NULL);      /* for cleanup */
 466
 467                 rc = -ENOMEM;
 468                 pgp->pg = alloc_pages (gfp_mask, 0);
 469                 if (pgp->pg == NULL)
 470                         goto out;
 471
 472                 pgp->count = PAGE_SIZE;
 473                 pgp->off = off;
 474                 pgp->flag = 0;
 475
 476                 if (verify) {
 477                         void *addr = kmap(pgp->pg);
 478                         obd_off      stripe_off = off;
 479                         obd_id       stripe_id = oa->o_id;
 480
 481                         if (rw == OBD_BRW_WRITE) {
 482                                 echo_get_stripe_off_id(lsm, &stripe_off,
 483                                                        &stripe_id);
 484                                 page_debug_setup(addr, pgp->count,
 485                                                  stripe_off, stripe_id);
 486                         } else {
 487                                 page_debug_setup(addr, pgp->count,
 488                                                  0xdeadbeef00c0ffeeULL,
 489                                                  0xdeadbeef00c0ffeeULL);
 490                         }
 491                         kunmap(pgp->pg);
 492                 }
 493         }
 494
 495         rc = obd_brw(rw, ec->ec_exp, oa, lsm, npages, pga, oti);
 496
 497  out:
 498         if (rc != 0)
 499                 verify = 0;
 500
 501         for (i = 0, pgp = pga; i < npages; i++, pgp++) {
 502                 if (pgp->pg == NULL)
 503                         continue;
 504
 505                 if (verify) {
 506                         void    *addr = kmap(pgp->pg);
 507                         obd_off  stripe_off = pgp->off;
 508                         obd_id   stripe_id  = oa->o_id;
 509                         int      vrc;
 510
 511                         echo_get_stripe_off_id (lsm, &stripe_off, &stripe_id);
 512                         vrc = page_debug_check("test_brw", addr, pgp->count,
 513                                                stripe_off, stripe_id);
 514                         if (vrc != 0 && rc == 0)
 515                                 rc = vrc;
 516
 517                         kunmap(pgp->pg);
 518                 }
 519                 __free_pages(pgp->pg, 0);
 520         }
 521         OBD_FREE(pga, npages * sizeof(*pga));
 522         return (rc);
 523 }
 524
 525 #ifdef __KERNEL__
 526 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 527 static int echo_client_ubrw(struct obd_device *obd, int rw,
 528                             struct obdo *oa, struct lov_stripe_md *lsm,
 529                             obd_off offset, obd_size count, char *buffer,
 530                             struct obd_trans_info *oti)
 531 {
 532         struct echo_client_obd *ec = &obd->u.echo_client;
 533         obd_count               npages;
 534         struct brw_page        *pga;
 535         struct brw_page        *pgp;
 536         obd_off                 off;
 537         struct kiobuf          *kiobuf;
 538         int                     i;
 539         int                     rc;
 540
 541         LASSERT (rw == OBD_BRW_WRITE ||
 542                  rw == OBD_BRW_READ);
 543
 544         /* NB: for now, only whole pages, page aligned */
 545
 546         if (count <= 0 ||
 547             ((long)buffer & (PAGE_SIZE - 1)) != 0 ||
 548             (count & (PAGE_SIZE - 1)) != 0 ||
 549             (lsm != NULL && lsm->lsm_object_id != oa->o_id))
 550                 return (-EINVAL);
 551
 552         /* XXX think again with misaligned I/O */
 553         npages = count >> PAGE_SHIFT;
 554
 555         OBD_ALLOC(pga, npages * sizeof(*pga));
 556         if (pga == NULL)
 557                 return (-ENOMEM);
 558
 559         rc = alloc_kiovec (1, &kiobuf);
 560         if (rc != 0)
 561                 goto out_1;
 562
 563         rc = map_user_kiobuf ((rw == OBD_BRW_READ) ? READ : WRITE,
 564                               kiobuf, (unsigned long)buffer, count);
 565         if (rc != 0)
 566                 goto out_2;
 567
 568         LASSERT (kiobuf->offset == 0);
 569         LASSERT (kiobuf->nr_pages == npages);
 570
 571         for (i = 0, off = offset, pgp = pga;
 572              i < npages;
 573              i++, off += PAGE_SIZE, pgp++) {
 574                 pgp->off = off;
 575                 pgp->pg = kiobuf->maplist[i];
 576                 pgp->count = PAGE_SIZE;
 577                 pgp->flag = 0;
 578         }
 579
 580         rc = obd_brw(rw, ec->ec_exp, oa, lsm, npages, pga, oti);
 581
 582         //        if (rw == OBD_BRW_READ)
 583         //                mark_dirty_kiobuf (kiobuf, count);
 584
 585         unmap_kiobuf (kiobuf);
 586  out_2:
 587         free_kiovec (1, &kiobuf);
 588  out_1:
 589         OBD_FREE(pga, npages * sizeof(*pga));
 590         return (rc);
 591 }
 592 #else
 593 static int echo_client_ubrw(struct obd_device *obd, int rw,
 594                             struct obdo *oa, struct lov_stripe_md *lsm,
 595                             obd_off offset, obd_size count, char *buffer,
 596                             struct obd_trans_info *oti)
 597 {
 598 #warning "echo_client_ubrw() needs to be ported on 2.6 yet"
 599         LBUG();
 600         return 0;
 601 }
 602 #endif
 603 #endif
 604
 605 struct echo_async_state;
 606
 607 #define EAP_MAGIC 79277927
 608 struct echo_async_page {
 609         int                     eap_magic;
 610         struct page             *eap_page;
 611         void                    *eap_cookie;
 612         obd_off                 eap_off;
 613         struct echo_async_state *eap_eas;
 614         struct list_head        eap_item;
 615 };
 616
 617 struct echo_async_state {
 618         spinlock_t              eas_lock;
 619         obd_off                 eas_next_offset;
 620         obd_off                 eas_end_offset;
 621         int                     eas_in_flight;
 622         int                     eas_rc;
 623         wait_queue_head_t       eas_waitq;
 624         struct list_head        eas_avail;
 625         struct obdo             eas_oa;
 626 };
 627
 628 static int eas_should_wake(struct echo_async_state *eas)
 629 {
 630         unsigned long flags;
 631         int rc = 0;
 632         spin_lock_irqsave(&eas->eas_lock, flags);
 633         if (eas->eas_rc == 0 && !list_empty(&eas->eas_avail))
 634             rc = 1;
 635         spin_unlock_irqrestore(&eas->eas_lock, flags);
 636         return rc;
 637 };
 638
 639 struct echo_async_page *eap_from_cookie(void *cookie)
 640 {
 641         struct echo_async_page *eap = cookie;
 642         if (eap->eap_magic != EAP_MAGIC)
 643                 return ERR_PTR(-EINVAL);
 644         return eap;
 645 };
 646
 647 static int ec_ap_make_ready(void *data, int cmd)
 648 {
 649         /* our pages are issued ready */
 650         LBUG();
 651         return 0;
 652 }
 653 static int ec_ap_refresh_count(void *data, int cmd)
 654 {
 655         /* our pages are issued with a stable count */
 656         LBUG();
 657         return PAGE_SIZE;
 658 }
 659 static void ec_ap_fill_obdo(void *data, int cmd, struct obdo *oa)
 660 {
 661         struct echo_async_page *eap;
 662         eap = eap_from_cookie(data);
 663         if (IS_ERR(eap))
 664                 return;
 665
 666         memcpy(oa, &eap->eap_eas->eas_oa, sizeof(*oa));
 667 }
 668 static void ec_ap_completion(void *data, int cmd, int rc)
 669 {
 670         struct echo_async_page *eap = eap_from_cookie(data);
 671         struct echo_async_state *eas;
 672         unsigned long flags;
 673
 674         if (IS_ERR(eap))
 675                 return;
 676         eas = eap->eap_eas;
 677
 678         spin_lock_irqsave(&eas->eas_lock, flags);
 679         if (rc && !eas->eas_rc)
 680                 eas->eas_rc = rc;
 681         eas->eas_in_flight--;
 682         list_add(&eap->eap_item, &eas->eas_avail);
 683         wake_up(&eas->eas_waitq);
 684         spin_unlock_irqrestore(&eas->eas_lock, flags);
 685 }
 686
 687 static struct obd_async_page_ops ec_async_page_ops = {
 688         .ap_make_ready =        ec_ap_make_ready,
 689         .ap_refresh_count =     ec_ap_refresh_count,
 690         .ap_fill_obdo =         ec_ap_fill_obdo,
 691         .ap_completion =        ec_ap_completion,
 692 };
 693
 694 static int echo_client_async_page(struct obd_export *exp, int rw,
 695                                    struct obdo *oa, struct lov_stripe_md *lsm,
 696                                    obd_off offset, obd_size count,
 697                                    obd_size batching)
 698 {
 699         obd_count npages, i;
 700         struct echo_async_page *eap;
 701         struct echo_async_state eas;
 702         struct list_head *pos, *n;
 703         int rc = 0;
 704         unsigned long flags;
 705         LIST_HEAD(pages);
 706 #if 0
 707         int                     verify;
 708         int                     gfp_mask;
 709         /* oa_id  == 0    => speed test (no verification) else...
 710          * oa & 1         => use HIGHMEM
 711          */
 712         verify = (oa->o_id != 0);
 713         gfp_mask = ((oa->o_id & 1) == 0) ? GFP_KERNEL : GFP_HIGHUSER;
 714 #endif
 715
 716         LASSERT(rw == OBD_BRW_WRITE || rw == OBD_BRW_READ);
 717
 718         if (count <= 0 ||
 719             (count & (PAGE_SIZE - 1)) != 0 ||
 720             (lsm != NULL &&
 721              lsm->lsm_object_id != oa->o_id))
 722                 return (-EINVAL);
 723
 724         /* XXX think again with misaligned I/O */
 725         npages = batching >> PAGE_SHIFT;
 726
 727         memcpy(&eas.eas_oa, oa, sizeof(*oa));
 728         eas.eas_next_offset = offset;
 729         eas.eas_end_offset = offset + count;
 730         spin_lock_init(&eas.eas_lock);
 731         init_waitqueue_head(&eas.eas_waitq);
 732         eas.eas_in_flight = 0;
 733         eas.eas_rc = 0;
 734         INIT_LIST_HEAD(&eas.eas_avail);
 735
 736         /* prepare the group of pages that we're going to be keeping
 737          * in flight */
 738         for (i = 0; i < npages; i++) {
 739                 struct page *page = alloc_page(GFP_KERNEL);
 740                 if (page == NULL)
 741                         GOTO(out, rc = -ENOMEM);
 742
 743                 list_add_tail(&page->list, &pages);
 744
 745                 OBD_ALLOC(eap, sizeof(*eap));
 746                 if (eap == NULL)
 747                         GOTO(out, rc = -ENOMEM);
 748
 749                 eap->eap_magic = EAP_MAGIC;
 750                 eap->eap_page = page;
 751                 eap->eap_eas = &eas;
 752                 eap->eap_cookie = ERR_PTR(-ENOENT);
 753                 list_add_tail(&eap->eap_item, &eas.eas_avail);
 754         }
 755
 756         /* first we spin queueing io and being woken by its completion */
 757         spin_lock_irqsave(&eas.eas_lock, flags);
 758         for(;;) {
 759                 int rc;
 760
 761                 /* sleep until we have a page to send */
 762                 spin_unlock_irqrestore(&eas.eas_lock, flags);
 763                 rc = wait_event_interruptible(eas.eas_waitq,
 764                                               eas_should_wake(&eas));
 765                 spin_lock_irqsave(&eas.eas_lock, flags);
 766                 if (rc && !eas.eas_rc)
 767                         eas.eas_rc = rc;
 768                 if (eas.eas_rc)
 769                         break;
 770                 if (list_empty(&eas.eas_avail))
 771                         continue;
 772                 eap = list_entry(eas.eas_avail.next, struct echo_async_page,
 773                                  eap_item);
 774                 list_del(&eap->eap_item);
 775                 spin_unlock_irqrestore(&eas.eas_lock, flags);
 776
 777                 /* unbind the eap from its old page offset */
 778                 if (!IS_ERR(eap->eap_cookie)) {
 779                         obd_teardown_async_page(exp, lsm, NULL,
 780                                                 eap->eap_cookie);
 781                         eap->eap_cookie = ERR_PTR(-ENOENT);
 782                 }
 783
 784                 eas.eas_next_offset += PAGE_SIZE;
 785                 eap->eap_off = eas.eas_next_offset;
 786
 787                 rc = obd_prep_async_page(exp, lsm, NULL, eap->eap_page,
 788                                          eap->eap_off, &ec_async_page_ops,
 789                                          eap, &eap->eap_cookie);
 790                 if (rc) {
 791                         spin_lock_irqsave(&eas.eas_lock, flags);
 792                         eas.eas_rc = rc;
 793                         break;
 794                 }
 795
 796                 /* always asserts urgent, which isn't quite right */
 797                 rc = obd_queue_async_io(exp, lsm, NULL, eap->eap_cookie,
 798                                         rw, 0, PAGE_SIZE, 0,
 799                                         ASYNC_READY | ASYNC_URGENT |
 800                                         ASYNC_COUNT_STABLE);
 801                 spin_lock_irqsave(&eas.eas_lock, flags);
 802                 if (rc && !eas.eas_rc) {
 803                         eas.eas_rc = rc;
 804                         break;
 805                 }
 806                 eas.eas_in_flight++;
 807                 if (eas.eas_next_offset == eas.eas_end_offset)
 808                         break;
 809         }
 810
 811         /* still hold the eas_lock here.. */
 812
 813         /* now we just spin waiting for all the rpcs to complete */
 814         while(eas.eas_in_flight) {
 815                 spin_unlock_irqrestore(&eas.eas_lock, flags);
 816                 wait_event_interruptible(eas.eas_waitq,
 817                                          eas.eas_in_flight == 0);
 818                 spin_lock_irqsave(&eas.eas_lock, flags);
 819         }
 820         spin_unlock_irqrestore(&eas.eas_lock, flags);
 821
 822 out:
 823         list_for_each_safe(pos, n, &pages) {
 824                 struct page *page = list_entry(pos, struct page, list);
 825
 826                 list_del(&page->list);
 827                 if (page->private) {
 828                         eap = (struct echo_async_page *)page->private;
 829                         if (!IS_ERR(eap->eap_cookie))
 830                                 obd_teardown_async_page(exp, lsm, NULL,
 831                                                         eap->eap_cookie);
 832                         OBD_FREE(eap, sizeof(*eap));
 833                 }
 834                 __free_page(page);
 835         }
 836
 837         RETURN(rc);
 838 }
 839
 840 static int echo_client_prep_commit(struct obd_export *exp, int rw,
 841                                    struct obdo *oa, struct lov_stripe_md *lsm,
 842                                    obd_off offset, obd_size count,
 843                                    obd_size batch, struct obd_trans_info *oti)
 844 {
 845         struct obd_ioobj ioo;
 846         struct niobuf_local *lnb;
 847         struct niobuf_remote *rnb;
 848         obd_off off;
 849         obd_size npages, tot_pages;
 850         int i, ret = 0, err = 0;
 851         ENTRY;
 852
 853         if (count <= 0 || (count & (PAGE_SIZE - 1)) != 0 ||
 854             (lsm != NULL && lsm->lsm_object_id != oa->o_id))
 855                 RETURN(-EINVAL);
 856
 857         npages = batch >> PAGE_SHIFT;
 858         tot_pages = count >> PAGE_SHIFT;
 859
 860         OBD_ALLOC(lnb, npages * sizeof(struct niobuf_local));
 861         OBD_ALLOC(rnb, npages * sizeof(struct niobuf_remote));
 862
 863         if (lnb == NULL || rnb == NULL)
 864                 GOTO(out, ret = -ENOMEM);
 865
 866         obdo_to_ioobj(oa, &ioo);
 867         ioo.ioo_bufcnt = npages;
 868
 869         off = offset;
 870
 871         for(; tot_pages; tot_pages -= npages) {
 872                 if (tot_pages < npages)
 873                         npages = tot_pages;
 874
 875                 for (i = 0; i < npages; i++, off += PAGE_SIZE) {
 876                         rnb[i].offset = off;
 877                         rnb[i].len = PAGE_SIZE;
 878                 }
 879
 880                 /* XXX this can't be the best.. */
 881                 memset(oti, 0, sizeof(*oti));
 882
 883                 ret = obd_preprw(rw, exp, oa, 1, &ioo, npages, rnb, lnb, oti);
 884                 if (ret != 0)
 885                         GOTO(out, ret);
 886
 887                 for (i = 0; i < npages; i++) {
 888                         struct page *page = lnb[i].page;
 889                         void *addr;
 890
 891                         /* read past eof? */
 892                         if (page == NULL && lnb[i].rc == 0)
 893                                 continue;
 894
 895                         addr = kmap(lnb[i].page);
 896
 897                         if (rw == OBD_BRW_WRITE)
 898                                 page_debug_setup(addr, PAGE_SIZE,
 899                                                  rnb[i].offset, oa->o_id);
 900                         else
 901                                 err = page_debug_check("prep_commit", addr,
 902                                                  PAGE_SIZE, rnb[i].offset,
 903                                                  oa->o_id);
 904
 905                         kunmap(lnb[i].page);
 906                 }
 907
 908                 ret = obd_commitrw(rw, exp, oa, 1, &ioo, npages, lnb, oti);
 909                 if (ret != 0)
 910                         GOTO(out, ret);
 911                 if (err)
 912                         GOTO(out, ret = err);
 913         }
 914
 915 out:
 916         if (lnb)
 917                 OBD_FREE(lnb, npages * sizeof(struct niobuf_local));
 918         if (rnb)
 919                 OBD_FREE(rnb, npages * sizeof(struct niobuf_remote));
 920         RETURN(ret);
 921 }
 922
 923 int echo_client_brw_ioctl(int rw, struct obd_export *exp,
 924                           struct obd_ioctl_data *data)
 925 {
 926         struct obd_device *obd = class_exp2obd(exp);
 927         struct echo_client_obd *ec = &obd->u.echo_client;
 928         struct obd_trans_info dummy_oti;
 929         struct ec_object *eco;
 930         int rc;
 931         ENTRY;
 932
 933         rc = echo_get_object(&eco, obd, &data->ioc_obdo1);
 934         if (rc)
 935                 RETURN(rc);
 936
 937         memset(&dummy_oti, 0, sizeof(dummy_oti));
 938
 939         data->ioc_obdo1.o_valid &= ~OBD_MD_FLHANDLE;
 940         data->ioc_obdo1.o_valid |= OBD_MD_FLGROUP;
 941         data->ioc_obdo1.o_gr = 2;
 942
 943         switch((long)data->ioc_pbuf1) {
 944         case 1:
 945                 if (data->ioc_pbuf2 == NULL) { // NULL user data pointer
 946                         rc = echo_client_kbrw(obd, rw, &data->ioc_obdo1,
 947                                               eco->eco_lsm, data->ioc_offset,
 948                                               data->ioc_count, &dummy_oti);
 949                 } else {
 950 #ifdef __KERNEL__
 951                         rc = echo_client_ubrw(obd, rw, &data->ioc_obdo1,
 952                                               eco->eco_lsm, data->ioc_offset,
 953                                               data->ioc_count, data->ioc_pbuf2,
 954                                               &dummy_oti);
 955 #endif
 956                 }
 957                 break;
 958         case 2:
 959                 rc = echo_client_async_page(ec->ec_exp, rw, &data->ioc_obdo1,
 960                                            eco->eco_lsm, data->ioc_offset,
 961                                            data->ioc_count, data->ioc_plen1);
 962                 break;
 963         case 3:
 964                 rc = echo_client_prep_commit(ec->ec_exp, rw, &data->ioc_obdo1,
 965                                             eco->eco_lsm, data->ioc_offset,
 966                                             data->ioc_count, data->ioc_plen1,
 967                                             &dummy_oti);
 968                 break;
 969         default:
 970                 rc = -EINVAL;
 971         }
 972         echo_put_object(eco);
 973         RETURN(rc);
 974 }
 975
 976 static int
 977 echo_ldlm_callback (struct ldlm_lock *lock, struct ldlm_lock_desc *new,
 978                     void *data, int flag)
 979 {
 980         struct ec_object       *eco = (struct ec_object *)data;
 981         struct echo_client_obd *ec = &(eco->eco_device->u.echo_client);
 982         struct lustre_handle    lockh;
 983         struct list_head       *el;
 984         int                     found = 0;
 985         int                     rc;
 986
 987         ldlm_lock2handle (lock, &lockh);
 988
 989         /* #ifdef this out if we're not feeling paranoid */
 990         spin_lock (&ec->ec_lock);
 991         list_for_each (el, &ec->ec_objects) {
 992                 found = (eco == list_entry(el, struct ec_object,
 993                                            eco_obj_chain));
 994                 if (found)
 995                         break;
 996         }
 997         spin_unlock (&ec->ec_lock);
 998         LASSERT (found);
 999
1000         switch (flag) {
1001         case LDLM_CB_BLOCKING:
1002                 CDEBUG(D_INFO, "blocking callback on "LPX64", handle "LPX64"\n",
1003                        eco->eco_id, lockh.cookie);
1004                 rc = ldlm_cli_cancel (&lockh);
1005                 if (rc != ELDLM_OK)
1006                         CERROR ("ldlm_cli_cancel failed: %d\n", rc);
1007                 break;
1008
1009         case LDLM_CB_CANCELING:
1010                 CDEBUG(D_INFO, "cancel callback on "LPX64", handle "LPX64"\n",
1011                        eco->eco_id, lockh.cookie);
1012                 break;
1013
1014         default:
1015                 LBUG ();
1016         }
1017
1018         return (0);
1019 }
1020
1021 static int
1022 echo_client_enqueue(struct obd_export *exp, struct obdo *oa,
1023                     int mode, obd_off offset, obd_size nob)
1024 {
1025         struct obd_device      *obd = exp->exp_obd;
1026         struct echo_client_obd *ec = &obd->u.echo_client;
1027         struct lustre_handle   *ulh = obdo_handle (oa);
1028         struct ec_object       *eco;
1029         struct ec_lock         *ecl;
1030         int                     flags;
1031         int                     rc;
1032
1033         if (!(mode == LCK_PR || mode == LCK_PW))
1034                 return -EINVAL;
1035
1036         if ((offset & (PAGE_SIZE - 1)) != 0 ||
1037             (nob & (PAGE_SIZE - 1)) != 0)
1038                 return -EINVAL;
1039
1040         rc = echo_get_object (&eco, obd, oa);
1041         if (rc != 0)
1042                 return rc;
1043
1044         rc = -ENOMEM;
1045         OBD_ALLOC (ecl, sizeof (*ecl));
1046         if (ecl == NULL)
1047                 goto failed_0;
1048
1049         ecl->ecl_mode = mode;
1050         ecl->ecl_object = eco;
1051         ecl->ecl_extent.start = offset;
1052         ecl->ecl_extent.end = (nob == 0) ? ((obd_off) -1) : (offset + nob - 1);
1053
1054         flags = 0;
1055         rc = obd_enqueue(ec->ec_exp, eco->eco_lsm, NULL, LDLM_EXTENT,
1056                          &ecl->ecl_extent,sizeof(ecl->ecl_extent), mode,
1057                          &flags, echo_ldlm_callback, eco,
1058                          &ecl->ecl_lock_handle);
1059         if (rc != 0)
1060                 goto failed_1;
1061
1062         CDEBUG(D_INFO, "enqueue handle "LPX64"\n", ecl->ecl_lock_handle.cookie);
1063
1064         /* NB ecl takes object ref from echo_get_object() above */
1065         spin_lock(&ec->ec_lock);
1066
1067         list_add(&ecl->ecl_exp_chain, &exp->exp_ec_data.eced_locks);
1068         ulh->cookie = ecl->ecl_cookie = ec->ec_unique++;
1069
1070         spin_unlock(&ec->ec_lock);
1071
1072         oa->o_valid |= OBD_MD_FLHANDLE;
1073         return 0;
1074
1075  failed_1:
1076         OBD_FREE (ecl, sizeof (*ecl));
1077  failed_0:
1078         echo_put_object (eco);
1079         return (rc);
1080 }
1081
1082 static int
1083 echo_client_cancel(struct obd_export *exp, struct obdo *oa)
1084 {
1085         struct obd_device      *obd = exp->exp_obd;
1086         struct echo_client_obd *ec = &obd->u.echo_client;
1087         struct lustre_handle   *ulh = obdo_handle (oa);
1088         struct ec_lock         *ecl = NULL;
1089         int                     found = 0;
1090         struct list_head       *el;
1091         int                     rc;
1092
1093         if ((oa->o_valid & OBD_MD_FLHANDLE) == 0)
1094                 return -EINVAL;
1095
1096         spin_lock (&ec->ec_lock);
1097
1098         list_for_each (el, &exp->exp_ec_data.eced_locks) {
1099                 ecl = list_entry (el, struct ec_lock, ecl_exp_chain);
1100                 found = (ecl->ecl_cookie == ulh->cookie);
1101                 if (found) {
1102                         list_del (&ecl->ecl_exp_chain);
1103                         break;
1104                 }
1105         }
1106
1107         spin_unlock (&ec->ec_lock);
1108
1109         if (!found)
1110                 return (-ENOENT);
1111
1112         rc = obd_cancel(ec->ec_exp, ecl->ecl_object->eco_lsm, ecl->ecl_mode,
1113                         &ecl->ecl_lock_handle);
1114
1115         echo_put_object (ecl->ecl_object);
1116         OBD_FREE (ecl, sizeof (*ecl));
1117
1118         return rc;
1119 }
1120
1121 static int
1122 echo_client_iocontrol(unsigned int cmd, struct obd_export *exp,
1123                       int len, void *karg, void *uarg)
1124 {
1125         struct obd_device      *obd;
1126         struct echo_client_obd *ec;
1127         struct ec_object       *eco;
1128         struct obd_ioctl_data  *data = karg;
1129         struct obd_trans_info   dummy_oti;
1130         struct oti_req_ack_lock *ack_lock;
1131         struct obdo            *oa;
1132         int                     rw = OBD_BRW_READ;
1133         int                     rc = 0;
1134         int                     i;
1135         ENTRY;
1136
1137         memset(&dummy_oti, 0, sizeof(dummy_oti));
1138
1139         obd = exp->exp_obd;
1140         ec = &obd->u.echo_client;
1141
1142         switch (cmd) {
1143         case OBD_IOC_CREATE:                    /* may create echo object */
1144                 if (!capable (CAP_SYS_ADMIN))
1145                         GOTO (out, rc = -EPERM);
1146
1147                 rc = echo_create_object (obd, 1, &data->ioc_obdo1,
1148                                          data->ioc_pbuf1, data->ioc_plen1,
1149                                          &dummy_oti);
1150                 GOTO(out, rc);
1151
1152         case OBD_IOC_DESTROY:
1153                 if (!capable (CAP_SYS_ADMIN))
1154                         GOTO (out, rc = -EPERM);
1155
1156                 rc = echo_get_object (&eco, obd, &data->ioc_obdo1);
1157                 if (rc == 0) {
1158                         oa = &data->ioc_obdo1;
1159                         oa->o_gr = 2;
1160                         oa->o_valid |= OBD_MD_FLGROUP;
1161                         rc = obd_destroy(ec->ec_exp, oa, eco->eco_lsm,
1162                                          &dummy_oti);
1163                         if (rc == 0)
1164                                 eco->eco_deleted = 1;
1165                         echo_put_object(eco);
1166                 }
1167                 GOTO(out, rc);
1168
1169         case OBD_IOC_GETATTR:
1170                 rc = echo_get_object (&eco, obd, &data->ioc_obdo1);
1171                 if (rc == 0) {
1172                         rc = obd_getattr(ec->ec_exp, &data->ioc_obdo1,
1173                                          eco->eco_lsm);
1174                         echo_put_object(eco);
1175                 }
1176                 GOTO(out, rc);
1177
1178         case OBD_IOC_SETATTR:
1179                 if (!capable (CAP_SYS_ADMIN))
1180                         GOTO (out, rc = -EPERM);
1181
1182                 rc = echo_get_object (&eco, obd, &data->ioc_obdo1);
1183                 if (rc == 0) {
1184                         rc = obd_setattr(ec->ec_exp, &data->ioc_obdo1,
1185                                          eco->eco_lsm, NULL);
1186                         echo_put_object(eco);
1187                 }
1188                 GOTO(out, rc);
1189
1190         case OBD_IOC_BRW_WRITE:
1191                 if (!capable (CAP_SYS_ADMIN))
1192                         GOTO (out, rc = -EPERM);
1193
1194                 rw = OBD_BRW_WRITE;
1195                 /* fall through */
1196         case OBD_IOC_BRW_READ:
1197                 rc = echo_client_brw_ioctl(rw, exp, data);
1198                 GOTO(out, rc);
1199
1200         case ECHO_IOC_GET_STRIPE:
1201                 rc = echo_get_object(&eco, obd, &data->ioc_obdo1);
1202                 if (rc == 0) {
1203                         rc = echo_copyout_lsm(eco->eco_lsm, data->ioc_pbuf1,
1204                                               data->ioc_plen1);
1205                         echo_put_object(eco);
1206                 }
1207                 GOTO(out, rc);
1208
1209         case ECHO_IOC_SET_STRIPE:
1210                 if (!capable (CAP_SYS_ADMIN))
1211                         GOTO (out, rc = -EPERM);
1212
1213                 if (data->ioc_pbuf1 == NULL) {  /* unset */
1214                         rc = echo_get_object(&eco, obd, &data->ioc_obdo1);
1215                         if (rc == 0) {
1216                                 eco->eco_deleted = 1;
1217                                 echo_put_object(eco);
1218                         }
1219                 } else {
1220                         rc = echo_create_object(obd, 0, &data->ioc_obdo1,
1221                                                 data->ioc_pbuf1,
1222                                                 data->ioc_plen1, &dummy_oti);
1223                 }
1224                 GOTO (out, rc);
1225
1226         case ECHO_IOC_ENQUEUE:
1227                 if (!capable (CAP_SYS_ADMIN))
1228                         GOTO (out, rc = -EPERM);
1229
1230                 rc = echo_client_enqueue(exp, &data->ioc_obdo1,
1231                                          data->ioc_conn1, /* lock mode */
1232                                    data->ioc_offset, data->ioc_count);/*extent*/
1233                 GOTO (out, rc);
1234
1235         case ECHO_IOC_CANCEL:
1236                 rc = echo_client_cancel(exp, &data->ioc_obdo1);
1237                 GOTO (out, rc);
1238
1239         default:
1240                 CERROR ("echo_ioctl(): unrecognised ioctl %#x\n", cmd);
1241                 GOTO (out, rc = -ENOTTY);
1242         }
1243
1244         EXIT;
1245  out:
1246
1247         /* XXX this should be in a helper also called by target_send_reply */
1248         for (ack_lock = dummy_oti.oti_ack_locks, i = 0; i < 4;
1249              i++, ack_lock++) {
1250                 if (!ack_lock->mode)
1251                         break;
1252                 ldlm_lock_decref(&ack_lock->lock, ack_lock->mode);
1253         }
1254
1255         return rc;
1256 }
1257
1258 static int
1259 echo_client_setup(struct obd_device *obddev, obd_count len, void *buf)
1260 {
1261         struct lustre_cfg* lcfg = buf;
1262         struct echo_client_obd *ec = &obddev->u.echo_client;
1263         struct obd_device *tgt;
1264         struct lustre_handle conn = {0, };
1265         struct obd_uuid echo_uuid = { "ECHO_UUID" };
1266         int rc;
1267         ENTRY;
1268
1269         if (lcfg->lcfg_inllen1 < 1) {
1270                 CERROR("requires a TARGET OBD name\n");
1271                 RETURN(-EINVAL);
1272         }
1273
1274         tgt = class_name2obd(lcfg->lcfg_inlbuf1);
1275         if (!tgt || !tgt->obd_attached || !tgt->obd_set_up) {
1276                 CERROR("device not attached or not set up (%s)\n",
1277                        lcfg->lcfg_inlbuf1);
1278                 RETURN(-EINVAL);
1279         }
1280
1281         spin_lock_init (&ec->ec_lock);
1282         INIT_LIST_HEAD (&ec->ec_objects);
1283         ec->ec_unique = 0;
1284
1285         rc = obd_connect(&conn, tgt, &echo_uuid);
1286         if (rc) {
1287                 CERROR("fail to connect to device %s\n", lcfg->lcfg_inlbuf1);
1288                 return (rc);
1289         }
1290         ec->ec_exp = class_conn2export(&conn);
1291
1292         RETURN(rc);
1293 }
1294
1295 static int echo_client_cleanup(struct obd_device *obddev, int flags)
1296 {
1297         struct list_head       *el;
1298         struct ec_object       *eco;
1299         struct echo_client_obd *ec = &obddev->u.echo_client;
1300         int rc;
1301         ENTRY;
1302
1303         if (!list_empty(&obddev->obd_exports)) {
1304                 CERROR("still has clients!\n");
1305                 RETURN(-EBUSY);
1306         }
1307
1308         /* XXX assuming sole access */
1309         while (!list_empty(&ec->ec_objects)) {
1310                 el = ec->ec_objects.next;
1311                 eco = list_entry(el, struct ec_object, eco_obj_chain);
1312
1313                 LASSERT(eco->eco_refcount == 0);
1314                 eco->eco_refcount = 1;
1315                 eco->eco_deleted = 1;
1316                 echo_put_object(eco);
1317         }
1318
1319         rc = obd_disconnect(ec->ec_exp, 0);
1320         if (rc != 0)
1321                 CERROR("fail to disconnect device: %d\n", rc);
1322
1323         RETURN(rc);
1324 }
1325
1326 static int echo_client_connect(struct lustre_handle *conn,
1327                                struct obd_device *src, struct obd_uuid *cluuid)
1328 {
1329         struct obd_export *exp;
1330         int                rc;
1331
1332         rc = class_connect(conn, src, cluuid);
1333         if (rc == 0) {
1334                 exp = class_conn2export(conn);
1335                 INIT_LIST_HEAD(&exp->exp_ec_data.eced_locks);
1336                 class_export_put(exp);
1337         }
1338
1339         RETURN (rc);
1340 }
1341
1342 static int echo_client_disconnect(struct obd_export *exp, int flags)
1343 {
1344         struct obd_device      *obd;
1345         struct echo_client_obd *ec;
1346         struct ec_lock         *ecl;
1347         int                     rc;
1348         ENTRY;
1349
1350         if (exp == NULL)
1351                 GOTO(out, rc = -EINVAL);
1352
1353         obd = exp->exp_obd;
1354         ec = &obd->u.echo_client;
1355
1356         /* no more contention on export's lock list */
1357         while (!list_empty (&exp->exp_ec_data.eced_locks)) {
1358                 ecl = list_entry (exp->exp_ec_data.eced_locks.next,
1359                                   struct ec_lock, ecl_exp_chain);
1360                 list_del (&ecl->ecl_exp_chain);
1361
1362                 rc = obd_cancel(ec->ec_exp, ecl->ecl_object->eco_lsm,
1363                                  ecl->ecl_mode, &ecl->ecl_lock_handle);
1364
1365                 CDEBUG (D_INFO, "Cancel lock on object "LPX64" on disconnect "
1366                         "(%d)\n", ecl->ecl_object->eco_id, rc);
1367
1368                 echo_put_object (ecl->ecl_object);
1369                 OBD_FREE (ecl, sizeof (*ecl));
1370         }
1371
1372         rc = class_disconnect(exp, 0);
1373         GOTO(out, rc);
1374  out:
1375         return rc;
1376 }
1377
1378 static struct obd_ops echo_obd_ops = {
1379         o_owner:       THIS_MODULE,
1380         o_setup:       echo_client_setup,
1381         o_cleanup:     echo_client_cleanup,
1382         o_iocontrol:   echo_client_iocontrol,
1383         o_connect:     echo_client_connect,
1384         o_disconnect:  echo_client_disconnect
1385 };
1386
1387 int echo_client_init(void)
1388 {
1389         struct lprocfs_static_vars lvars;
1390
1391         lprocfs_init_vars(echo, &lvars);
1392         return class_register_type(&echo_obd_ops, lvars.module_vars,
1393                                    OBD_ECHO_CLIENT_DEVICENAME);
1394 }
1395
1396 void echo_client_exit(void)
1397 {
1398         class_unregister_type(OBD_ECHO_CLIENT_DEVICENAME);
1399 }