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  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_ECHO
  38 #ifdef __KERNEL__
  39 #include <libcfs/libcfs.h>
  40 #else
  41 #include <liblustre.h>
  42 #endif
  43
  44 #include <obd.h>
  45 #include <obd_support.h>
  46 #include <obd_class.h>
  47 #include <lustre_debug.h>
  48 #include <lprocfs_status.h>
  49 #include <cl_object.h>
  50
  51 #include "echo_internal.h"
  52
  53 struct echo_device {
  54         struct cl_device        ed_cl;
  55         struct echo_client_obd *ed_ec;
  56
  57         struct cl_site          ed_site_myself;
  58         struct cl_site         *ed_site;
  59         struct lu_device       *ed_next;
  60         int                     ed_next_islov;
  61 };
  62
  63 struct echo_object {
  64         struct cl_object        eo_cl;
  65         struct cl_object_header eo_hdr;
  66
  67         struct echo_device     *eo_dev;
  68         struct list_head        eo_obj_chain;
  69         struct lov_stripe_md   *eo_lsm;
  70         atomic_t                eo_npages;
  71         int                     eo_deleted;
  72 };
  73
  74 struct echo_object_conf {
  75         struct cl_object_conf  eoc_cl;
  76         struct lov_stripe_md **eoc_md;
  77 };
  78
  79 struct echo_page {
  80         struct cl_page_slice   ep_cl;
  81         struct cl_sync_io     *ep_sync_io;
  82         cfs_page_t            *ep_vmpage;
  83 };
  84
  85 struct echo_lock {
  86         struct cl_lock_slice   el_cl;
  87         struct list_head       el_chain;
  88         struct echo_object    *el_object;
  89         __u64                  el_cookie;
  90 };
  91
  92 struct echo_io {
  93         struct cl_io_slice     ei_cl;
  94 };
  95
  96 #if 0
  97 struct echo_req {
  98         struct cl_req_slice er_cl;
  99 };
 100 #endif
 101
 102 static int echo_client_setup(struct obd_device *obddev,
 103                              struct lustre_cfg *lcfg);
 104 static int echo_client_cleanup(struct obd_device *obddev);
 105
 106
 107 /** \defgroup echo_helpers
 108  * @{
 109  */
 110 static inline struct echo_device *cl2echo_dev(const struct cl_device *dev)
 111 {
 112         return container_of0(dev, struct echo_device, ed_cl);
 113 }
 114
 115 static inline struct cl_device *echo_dev2cl(struct echo_device *d)
 116 {
 117         return &d->ed_cl;
 118 }
 119
 120 static inline struct echo_device *obd2echo_dev(const struct obd_device *obd)
 121 {
 122         return cl2echo_dev(lu2cl_dev(obd->obd_lu_dev));
 123 }
 124
 125 static inline struct cl_object *echo_obj2cl(struct echo_object *eco)
 126 {
 127         return &eco->eo_cl;
 128 }
 129
 130 static inline struct echo_object *cl2echo_obj(const struct cl_object *o)
 131 {
 132         return container_of(o, struct echo_object, eo_cl);
 133 }
 134
 135 static inline struct echo_page *cl2echo_page(const struct cl_page_slice *s)
 136 {
 137         return container_of(s, struct echo_page, ep_cl);
 138 }
 139
 140 static inline struct echo_lock *cl2echo_lock(const struct cl_lock_slice *s)
 141 {
 142         return container_of(s, struct echo_lock, el_cl);
 143 }
 144
 145 static inline struct cl_lock *echo_lock2cl(const struct echo_lock *ecl)
 146 {
 147         return ecl->el_cl.cls_lock;
 148 }
 149
 150 static struct lu_context_key echo_thread_key;
 151 static inline struct echo_thread_info *echo_env_info(const struct lu_env *env)
 152 {
 153         struct echo_thread_info *info;
 154         info = lu_context_key_get(&env->le_ctx, &echo_thread_key);
 155         LASSERT(info != NULL);
 156         return info;
 157 }
 158
 159 static inline
 160 struct echo_object_conf *cl2echo_conf(const struct cl_object_conf *c)
 161 {
 162         return container_of(c, struct echo_object_conf, eoc_cl);
 163 }
 164
 165 static inline void lsm2fid(struct lov_stripe_md *lsm, struct lu_fid *fid)
 166 {
 167         fid_zero(fid);
 168         fid->f_seq = lsm->lsm_object_gr << 16 | lsm->lsm_object_id >> 32;
 169         fid->f_oid = lsm->lsm_object_id;
 170 }
 171 /** @} echo_helpers */
 172
 173 static struct echo_object *cl_echo_object_find(struct echo_device *d,
 174                                                struct lov_stripe_md **lsm);
 175 static int cl_echo_object_put(struct echo_object *eco);
 176 static int cl_echo_enqueue   (struct echo_object *eco, obd_off start,
 177                               obd_off end, int mode, __u64 *cookie);
 178 static int cl_echo_cancel    (struct echo_device *d, __u64 cookie);
 179 static int cl_echo_object_brw(struct echo_object *eco, int rw, obd_off offset,
 180                               cfs_page_t **pages, int npages, int async);
 181
 182 static struct echo_thread_info *echo_env_info(const struct lu_env *env);
 183
 184 struct echo_thread_info {
 185         struct echo_object_conf eti_conf;
 186         struct lustre_md        eti_md;
 187
 188         struct cl_2queue        eti_queue;
 189         struct cl_io            eti_io;
 190         struct cl_sync_io       eti_anchor;
 191         struct cl_lock_descr    eti_descr;
 192         struct lu_fid           eti_fid;
 193 };
 194
 195 /* No session used right now */
 196 struct echo_session_info {
 197         unsigned long dummy;
 198 };
 199
 200 static cfs_mem_cache_t *echo_page_kmem;
 201 static cfs_mem_cache_t *echo_lock_kmem;
 202 static cfs_mem_cache_t *echo_object_kmem;
 203 static cfs_mem_cache_t *echo_thread_kmem;
 204 static cfs_mem_cache_t *echo_session_kmem;
 205 //static cfs_mem_cache_t *echo_req_kmem;
 206
 207 static struct lu_kmem_descr echo_caches[] = {
 208         {
 209                 .ckd_cache = &echo_page_kmem,
 210                 .ckd_name  = "echo_page_kmem",
 211                 .ckd_size  = sizeof (struct echo_page)
 212         },
 213         {
 214                 .ckd_cache = &echo_lock_kmem,
 215                 .ckd_name  = "echo_lock_kmem",
 216                 .ckd_size  = sizeof (struct echo_lock)
 217         },
 218         {
 219                 .ckd_cache = &echo_object_kmem,
 220                 .ckd_name  = "echo_object_kmem",
 221                 .ckd_size  = sizeof (struct echo_object)
 222         },
 223         {
 224                 .ckd_cache = &echo_thread_kmem,
 225                 .ckd_name  = "echo_thread_kmem",
 226                 .ckd_size  = sizeof (struct echo_thread_info)
 227         },
 228         {
 229                 .ckd_cache = &echo_session_kmem,
 230                 .ckd_name  = "echo_session_kmem",
 231                 .ckd_size  = sizeof (struct echo_session_info)
 232         },
 233 #if 0
 234         {
 235                 .ckd_cache = &echo_req_kmem,
 236                 .ckd_name  = "echo_req_kmem",
 237                 .ckd_size  = sizeof (struct echo_req)
 238         },
 239 #endif
 240         {
 241                 .ckd_cache = NULL
 242         }
 243 };
 244
 245 /** defgroup echo_page echo_page
 246  *
 247  * Echo page operations.
 248  *
 249  * @{
 250  */
 251 cfs_page_t *echo_page_vmpage(const struct lu_env *env,
 252                              const struct cl_page_slice *slice)
 253 {
 254         return cl2echo_page(slice)->ep_vmpage;
 255 }
 256
 257 static void echo_page_discard(const struct lu_env *env,
 258                               const struct cl_page_slice *slice,
 259                               struct cl_io *unused)
 260 {
 261         cl_page_delete(env, slice->cpl_page);
 262 }
 263
 264 static int echo_page_is_vmlocked(const struct lu_env *env,
 265                                  const struct cl_page_slice *slice)
 266 {
 267         return 1;
 268 }
 269
 270 static void echo_page_completion(const struct lu_env *env,
 271                                  const struct cl_page_slice *slice,
 272                                  int ioret)
 273 {
 274         struct echo_page *ecp     = cl2echo_page(slice);
 275         struct cl_sync_io *anchor = ecp->ep_sync_io;
 276         ENTRY;
 277
 278         LASSERT(anchor != NULL);
 279         ecp->ep_sync_io = NULL;
 280         cl_sync_io_note(anchor, ioret);
 281         EXIT;
 282 }
 283
 284 static void echo_page_fini(const struct lu_env *env,
 285                            struct cl_page_slice *slice)
 286 {
 287         struct echo_page *ep    = cl2echo_page(slice);
 288         struct echo_object *eco = cl2echo_obj(slice->cpl_obj);
 289         cfs_page_t *vmpage      = ep->ep_vmpage;
 290         ENTRY;
 291
 292         atomic_dec(&eco->eo_npages);
 293         page_cache_release(vmpage);
 294         OBD_SLAB_FREE_PTR(ep, echo_page_kmem);
 295         EXIT;
 296 }
 297
 298 static int echo_page_prep(const struct lu_env *env,
 299                           const struct cl_page_slice *slice,
 300                           struct cl_io *unused)
 301 {
 302         return 0;
 303 }
 304
 305 static int echo_page_print(const struct lu_env *env,
 306                            const struct cl_page_slice *slice,
 307                            void *cookie, lu_printer_t printer)
 308 {
 309         struct echo_page *ep = cl2echo_page(slice);
 310
 311         (*printer)(env, cookie, LUSTRE_ECHO_CLIENT_NAME"-page@%p vm@%p\n",
 312                    ep, ep->ep_vmpage);
 313         return 0;
 314 }
 315
 316 static const struct cl_page_operations echo_page_ops = {
 317         .cpo_discard       = echo_page_discard,
 318         .cpo_vmpage        = echo_page_vmpage,
 319         .cpo_fini          = echo_page_fini,
 320         .cpo_print         = echo_page_print,
 321         .cpo_is_vmlocked   = echo_page_is_vmlocked,
 322         .io = {
 323                 [CRT_READ] = {
 324                         .cpo_prep        = echo_page_prep,
 325                         .cpo_completion  = echo_page_completion,
 326                 },
 327                 [CRT_WRITE] = {
 328                         .cpo_prep        = echo_page_prep,
 329                         .cpo_completion  = echo_page_completion,
 330                 }
 331         }
 332 };
 333 /** @} echo_page */
 334
 335 /** \defgroup echo_lock echo_lock
 336  *
 337  * echo lock operations
 338  *
 339  * @{
 340  */
 341 static void echo_lock_fini(const struct lu_env *env,
 342                            struct cl_lock_slice *slice)
 343 {
 344         struct echo_lock *ecl = cl2echo_lock(slice);
 345
 346         LASSERT(list_empty(&ecl->el_chain));
 347         OBD_SLAB_FREE_PTR(ecl, echo_lock_kmem);
 348 }
 349
 350 static void echo_lock_delete(const struct lu_env *env,
 351                              const struct cl_lock_slice *slice)
 352 {
 353         struct echo_lock *ecl      = cl2echo_lock(slice);
 354
 355         LASSERT(list_empty(&ecl->el_chain));
 356 }
 357
 358 static int echo_lock_fits_into(const struct lu_env *env,
 359                                const struct cl_lock_slice *slice,
 360                                const struct cl_lock_descr *need,
 361                                const struct cl_io *unused)
 362 {
 363         return 1;
 364 }
 365
 366 static struct cl_lock_operations echo_lock_ops = {
 367         .clo_fini      = echo_lock_fini,
 368         .clo_delete    = echo_lock_delete,
 369         .clo_fits_into = echo_lock_fits_into
 370 };
 371
 372 /** @} echo_lock */
 373
 374 /** \defgroup echo_cl_ops echo_cl_ops
 375  *
 376  * operations for cl_object
 377  *
 378  * @{
 379  */
 380 static struct cl_page *echo_page_init(const struct lu_env *env,
 381                                       struct cl_object *obj,
 382                                       struct cl_page *page, cfs_page_t *vmpage)
 383 {
 384         struct echo_page *ep;
 385         ENTRY;
 386
 387         OBD_SLAB_ALLOC_PTR_GFP(ep, echo_page_kmem, CFS_ALLOC_IO);
 388         if (ep != NULL) {
 389                 struct echo_object *eco = cl2echo_obj(obj);
 390                 ep->ep_vmpage = vmpage;
 391                 page_cache_get(vmpage);
 392                 cl_page_slice_add(page, &ep->ep_cl, obj, &echo_page_ops);
 393                 atomic_inc(&eco->eo_npages);
 394         }
 395         RETURN(ERR_PTR(ep ? 0 : -ENOMEM));
 396 }
 397
 398 static int echo_io_init(const struct lu_env *env, struct cl_object *obj,
 399                         struct cl_io *io)
 400 {
 401         return 0;
 402 }
 403
 404 static int echo_lock_init(const struct lu_env *env,
 405                           struct cl_object *obj, struct cl_lock *lock,
 406                           const struct cl_io *unused)
 407 {
 408         struct echo_lock *el;
 409         ENTRY;
 410
 411         OBD_SLAB_ALLOC_PTR_GFP(el, echo_lock_kmem, CFS_ALLOC_IO);
 412         if (el != NULL) {
 413                 cl_lock_slice_add(lock, &el->el_cl, obj, &echo_lock_ops);
 414                 el->el_object = cl2echo_obj(obj);
 415                 CFS_INIT_LIST_HEAD(&el->el_chain);
 416         }
 417         RETURN(el == NULL ? -ENOMEM : 0);
 418 }
 419
 420 static int echo_conf_set(const struct lu_env *env, struct cl_object *obj,
 421                          const struct cl_object_conf *conf)
 422 {
 423         return 0;
 424 }
 425
 426 static const struct cl_object_operations echo_cl_obj_ops = {
 427         .coo_page_init = echo_page_init,
 428         .coo_lock_init = echo_lock_init,
 429         .coo_io_init   = echo_io_init,
 430         .coo_conf_set  = echo_conf_set
 431 };
 432 /** @} echo_cl_ops */
 433
 434 /** \defgroup echo_lu_ops echo_lu_ops
 435  *
 436  * operations for echo lu object.
 437  *
 438  * @{
 439  */
 440 static int echo_object_init(const struct lu_env *env, struct lu_object *obj,
 441                             const struct lu_object_conf *conf)
 442 {
 443         const struct cl_object_conf *cconf = lu2cl_conf(conf);
 444         struct echo_object_conf *econf = cl2echo_conf(cconf);
 445         struct echo_device *ed         = cl2echo_dev(lu2cl_dev(obj->lo_dev));
 446         struct echo_client_obd *ec     = ed->ed_ec;
 447         struct echo_object *eco        = cl2echo_obj(lu2cl(obj));
 448         ENTRY;
 449
 450         if (ed->ed_next) {
 451                 struct lu_object  *below;
 452                 struct lu_device  *under;
 453
 454                 under = ed->ed_next;
 455                 below = under->ld_ops->ldo_object_alloc(env, obj->lo_header,
 456                                                         under);
 457                 if (below == NULL)
 458                         RETURN(-ENOMEM);
 459                 lu_object_add(obj, below);
 460         }
 461
 462         LASSERT(econf->eoc_md);
 463         eco->eo_lsm = *econf->eoc_md;
 464         eco->eo_dev = ed;
 465         atomic_set(&eco->eo_npages, 0);
 466
 467         /* clear the lsm pointer so that it won't get freed. */
 468         *econf->eoc_md = NULL;
 469
 470         spin_lock(&ec->ec_lock);
 471         list_add_tail(&eco->eo_obj_chain, &ec->ec_objects);
 472         spin_unlock(&ec->ec_lock);
 473
 474         RETURN(0);
 475 }
 476
 477 static void echo_object_free(const struct lu_env *env, struct lu_object *obj)
 478 {
 479         struct echo_object *eco    = cl2echo_obj(lu2cl(obj));
 480         struct echo_client_obd *ec = eco->eo_dev->ed_ec;
 481         struct lov_stripe_md *lsm  = eco->eo_lsm;
 482         ENTRY;
 483
 484         LASSERT(atomic_read(&eco->eo_npages) == 0);
 485
 486         spin_lock(&ec->ec_lock);
 487         list_del_init(&eco->eo_obj_chain);
 488         spin_unlock(&ec->ec_lock);
 489
 490         lu_object_fini(obj);
 491         lu_object_header_fini(obj->lo_header);
 492
 493         if (lsm)
 494                 obd_free_memmd(ec->ec_exp, &lsm);
 495         OBD_SLAB_FREE_PTR(eco, echo_object_kmem);
 496         EXIT;
 497 }
 498
 499 static int echo_object_print(const struct lu_env *env, void *cookie,
 500                             lu_printer_t p, const struct lu_object *o)
 501 {
 502         struct echo_object *obj = cl2echo_obj(lu2cl(o));
 503
 504         return (*p)(env, cookie, "echoclient-object@%p", obj);
 505 }
 506
 507
 508 static const struct lu_object_operations echo_lu_obj_ops = {
 509         .loo_object_init      = echo_object_init,
 510         .loo_object_delete    = NULL,
 511         .loo_object_release   = NULL,
 512         .loo_object_free      = echo_object_free,
 513         .loo_object_print     = echo_object_print,
 514         .loo_object_invariant = NULL
 515 };
 516 /** @} echo_lu_ops */
 517
 518 /** \defgroup echo_lu_dev_ops
 519  *
 520  * Operations for echo lu device.
 521  *
 522  * @{
 523  */
 524 static struct lu_object *echo_object_alloc(const struct lu_env *env,
 525                                          const struct lu_object_header *hdr,
 526                                          struct lu_device *dev)
 527 {
 528         struct echo_object *eco;
 529         struct lu_object *obj = NULL;
 530         ENTRY;
 531
 532         /* we're the top dev. */
 533         LASSERT(hdr == NULL);
 534         OBD_SLAB_ALLOC_PTR_GFP(eco, echo_object_kmem, CFS_ALLOC_IO);
 535         if (eco != NULL) {
 536                 struct cl_object_header *hdr = &eco->eo_hdr;
 537
 538                 obj = &echo_obj2cl(eco)->co_lu;
 539                 cl_object_header_init(hdr);
 540                 lu_object_init(obj, &hdr->coh_lu, dev);
 541                 lu_object_add_top(&hdr->coh_lu, obj);
 542
 543                 eco->eo_cl.co_ops = &echo_cl_obj_ops;
 544                 obj->lo_ops       = &echo_lu_obj_ops;
 545         }
 546         RETURN(obj);
 547 }
 548
 549 static struct lu_device_operations echo_device_lu_ops = {
 550         .ldo_object_alloc   = echo_object_alloc,
 551 };
 552 /** @} echo_lu_dev_ops */
 553
 554 static struct cl_device_operations echo_device_cl_ops = {
 555 };
 556
 557 /** \defgroup echo_init echo_init
 558  *
 559  * Init and fini functions for echo client.
 560  *
 561  * @{
 562  */
 563 static int echo_site_init(const struct lu_env *env, struct echo_device *ed)
 564 {
 565         struct cl_site *site = &ed->ed_site_myself;
 566         int rc;
 567
 568         /* initialize site */
 569         rc = cl_site_init(site, &ed->ed_cl);
 570         if (rc) {
 571                 CERROR("Cannot initilize site for echo client(%d)\n", rc);
 572                 return rc;
 573         }
 574
 575         rc = lu_site_init_finish(&site->cs_lu);
 576         if (rc)
 577                 return rc;
 578
 579         ed->ed_site = site;
 580         return 0;
 581 }
 582
 583 static void echo_site_fini(const struct lu_env *env, struct echo_device *ed)
 584 {
 585         if (ed->ed_site) {
 586                 cl_site_fini(ed->ed_site);
 587                 ed->ed_site = NULL;
 588         }
 589 }
 590
 591 static void *echo_thread_key_init(const struct lu_context *ctx,
 592                           struct lu_context_key *key)
 593 {
 594         struct echo_thread_info *info;
 595
 596         OBD_SLAB_ALLOC_PTR_GFP(info, echo_thread_kmem, CFS_ALLOC_IO);
 597         if (info == NULL)
 598                 info = ERR_PTR(-ENOMEM);
 599         return info;
 600 }
 601
 602 static void echo_thread_key_fini(const struct lu_context *ctx,
 603                          struct lu_context_key *key, void *data)
 604 {
 605         struct echo_thread_info *info = data;
 606         OBD_SLAB_FREE_PTR(info, echo_thread_kmem);
 607 }
 608
 609 static void echo_thread_key_exit(const struct lu_context *ctx,
 610                          struct lu_context_key *key, void *data)
 611 {
 612 }
 613
 614 static struct lu_context_key echo_thread_key = {
 615         .lct_tags = LCT_CL_THREAD,
 616         .lct_init = echo_thread_key_init,
 617         .lct_fini = echo_thread_key_fini,
 618         .lct_exit = echo_thread_key_exit
 619 };
 620
 621 static void *echo_session_key_init(const struct lu_context *ctx,
 622                                   struct lu_context_key *key)
 623 {
 624         struct echo_session_info *session;
 625
 626         OBD_SLAB_ALLOC_PTR_GFP(session, echo_session_kmem, CFS_ALLOC_IO);
 627         if (session == NULL)
 628                 session = ERR_PTR(-ENOMEM);
 629         return session;
 630 }
 631
 632 static void echo_session_key_fini(const struct lu_context *ctx,
 633                                  struct lu_context_key *key, void *data)
 634 {
 635         struct echo_session_info *session = data;
 636         OBD_SLAB_FREE_PTR(session, echo_session_kmem);
 637 }
 638
 639 static void echo_session_key_exit(const struct lu_context *ctx,
 640                                  struct lu_context_key *key, void *data)
 641 {
 642 }
 643
 644 static struct lu_context_key echo_session_key = {
 645         .lct_tags = LCT_SESSION,
 646         .lct_init = echo_session_key_init,
 647         .lct_fini = echo_session_key_fini,
 648         .lct_exit = echo_session_key_exit
 649 };
 650
 651 LU_TYPE_INIT_FINI(echo, &echo_thread_key, &echo_session_key);
 652
 653 static struct lu_device *echo_device_alloc(const struct lu_env *env,
 654                                            struct lu_device_type *t,
 655                                            struct lustre_cfg *cfg)
 656 {
 657         struct lu_device   *next;
 658         struct echo_device *ed;
 659         struct cl_device   *cd;
 660         struct obd_device  *obd = NULL; /* to keep compiler happy */
 661         struct obd_device  *tgt;
 662         const char *tgt_type_name;
 663         int rc;
 664         int cleanup = 0;
 665         ENTRY;
 666
 667         OBD_ALLOC_PTR(ed);
 668         if (ed == NULL)
 669                 GOTO(out, rc = -ENOMEM);
 670
 671         cleanup = 1;
 672         cd = &ed->ed_cl;
 673         rc = cl_device_init(cd, t);
 674         if (rc)
 675                 GOTO(out, rc);
 676
 677         cd->cd_lu_dev.ld_ops = &echo_device_lu_ops;
 678         cd->cd_ops = &echo_device_cl_ops;
 679
 680         cleanup = 2;
 681         rc = echo_site_init(env, ed);
 682         if (rc)
 683                 GOTO(out, rc);
 684
 685         cleanup = 3;
 686         obd = class_name2obd(lustre_cfg_string(cfg, 0));
 687         LASSERT(obd != NULL);
 688         rc = echo_client_setup(obd, cfg);
 689         if (rc)
 690                 GOTO(out, rc);
 691         ed->ed_ec = &obd->u.echo_client;
 692
 693         cleanup = 4;
 694         tgt = class_name2obd(lustre_cfg_string(cfg, 1));
 695         LASSERT(tgt != NULL);
 696         next = tgt->obd_lu_dev;
 697         if (next != NULL && !lu_device_is_cl(next))
 698                 next = NULL;
 699
 700         /*
 701          * if echo client is to be stacked upon ost device, the next is NULL
 702          * since ost is not a clio device so far
 703          */
 704         tgt_type_name = tgt->obd_type->typ_name;
 705         if (next != NULL) {
 706                 LASSERT(next != NULL);
 707                 if (next->ld_site != NULL)
 708                         GOTO(out, rc = -EBUSY);
 709
 710                 next->ld_site = &ed->ed_site->cs_lu;
 711                 rc = next->ld_type->ldt_ops->ldto_device_init(env, next,
 712                                              next->ld_type->ldt_name, NULL);
 713                 if (rc)
 714                         GOTO(out, rc);
 715
 716                 /* Trikcy case, I have to determine the obd type since clio
 717                  * uses the different parameters to initialize objects for
 718                  * lov & osc.
 719                  */
 720                 if (strcmp(tgt_type_name, LUSTRE_LOV_NAME) == 0)
 721                         ed->ed_next_islov = 1;
 722                 else
 723                         LASSERT(strcmp(tgt_type_name, LUSTRE_OSC_NAME) == 0);
 724         } else
 725                 LASSERT(strcmp(tgt_type_name, LUSTRE_OST_NAME) == 0);
 726
 727         ed->ed_next = next;
 728         RETURN(&cd->cd_lu_dev);
 729
 730 out:
 731         switch(cleanup) {
 732         case 4: {
 733                 int rc2;
 734                 rc2 = echo_client_cleanup(obd);
 735                 if (rc2)
 736                         CERROR("Cleanup obd device %s error(%d)\n",
 737                                obd->obd_name, rc2);
 738         }
 739
 740         case 3:
 741                 echo_site_fini(env, ed);
 742         case 2:
 743                 cl_device_fini(&ed->ed_cl);
 744         case 1:
 745                 OBD_FREE_PTR(ed);
 746         case 0:
 747         default:
 748                 break;
 749         }
 750         return(ERR_PTR(rc));
 751 }
 752
 753 static int echo_device_init(const struct lu_env *env, struct lu_device *d,
 754                           const char *name, struct lu_device *next)
 755 {
 756         LBUG();
 757         return 0;
 758 }
 759
 760 static struct lu_device *echo_device_fini(const struct lu_env *env,
 761                                           struct lu_device *d)
 762 {
 763         struct echo_device *ed = cl2echo_dev(lu2cl_dev(d));
 764         struct lu_device *next = ed->ed_next;
 765
 766         while (next)
 767                 next = next->ld_type->ldt_ops->ldto_device_fini(env, next);
 768         return NULL;
 769 }
 770
 771 static struct lu_device *echo_device_free(const struct lu_env *env,
 772                                           struct lu_device *d)
 773 {
 774         struct echo_device     *ed   = cl2echo_dev(lu2cl_dev(d));
 775         struct echo_client_obd *ec   = ed->ed_ec;
 776         struct lu_device       *next = ed->ed_next;
 777
 778         printk("ed = %p, ec = %p, next = %p\n", ed, ec, next);
 779
 780         /* destroy locks */
 781         spin_lock(&ec->ec_lock);
 782         while (!list_empty(&ec->ec_locks)) {
 783                 struct echo_lock *ecl = list_entry(ec->ec_locks.next,
 784                                                    struct echo_lock, el_chain);
 785                 struct cl_lock *lock  = echo_lock2cl(ecl);
 786
 787                 list_del_init(&ecl->el_chain);
 788                 spin_unlock(&ec->ec_lock);
 789
 790                 CERROR("echo client: pending lock %p\n", ecl);
 791
 792                 cl_lock_get(lock);
 793                 cl_unuse(env, lock);
 794                 cl_lock_release(env, lock, "ec enqueue", ecl->el_object);
 795
 796                 cl_lock_mutex_get(env, lock);
 797                 cl_lock_cancel(env, lock);
 798                 cl_lock_delete(env, lock);
 799                 cl_lock_mutex_put(env, lock);
 800                 cl_lock_put(env, lock);
 801
 802                 spin_lock(&ec->ec_lock);
 803         }
 804         spin_unlock(&ec->ec_lock);
 805
 806         LASSERT(ed->ed_site);
 807         lu_site_purge(env, &ed->ed_site->cs_lu, -1);
 808
 809         /* check if there are objects still alive, assume only one reference */
 810         spin_lock(&ec->ec_lock);
 811         while (!list_empty(&ec->ec_objects)) {
 812                 struct echo_object *eco;
 813                 eco = list_entry(ec->ec_objects.next, struct echo_object,
 814                                  eo_obj_chain);
 815                 spin_unlock(&ec->ec_lock);
 816
 817                 eco->eo_deleted = 1;
 818                 cl_echo_object_put(eco);
 819
 820                 spin_lock(&ec->ec_lock);
 821         }
 822         spin_unlock(&ec->ec_lock);
 823
 824         echo_client_cleanup(d->ld_obd);
 825
 826         while (next)
 827                 next = next->ld_type->ldt_ops->ldto_device_free(env, next);
 828
 829         LASSERT(ed->ed_site == lu2cl_site(d->ld_site));
 830         echo_site_fini(env, ed);
 831         cl_device_fini(&ed->ed_cl);
 832         OBD_FREE_PTR(ed);
 833
 834         return NULL;
 835 }
 836
 837 static const struct lu_device_type_operations echo_device_type_ops = {
 838         .ldto_init = echo_type_init,
 839         .ldto_fini = echo_type_fini,
 840
 841         .ldto_start = echo_type_start,
 842         .ldto_stop  = echo_type_stop,
 843
 844         .ldto_device_alloc = echo_device_alloc,
 845         .ldto_device_free  = echo_device_free,
 846         .ldto_device_init  = echo_device_init,
 847         .ldto_device_fini  = echo_device_fini
 848 };
 849
 850 static struct lu_device_type echo_device_type = {
 851         .ldt_tags     = LU_DEVICE_CL,
 852         .ldt_name     = LUSTRE_ECHO_CLIENT_NAME,
 853         .ldt_ops      = &echo_device_type_ops,
 854         .ldt_ctx_tags = LCT_CL_THREAD
 855 };
 856 /** @} echo_init */
 857
 858 /** \defgroup echo_exports
 859  *
 860  * exporting functions to echo client
 861  *
 862  * @{
 863  */
 864
 865 /* Interfaces to echo client obd device */
 866 static struct echo_object *cl_echo_object_find(struct echo_device *d,
 867                                                struct lov_stripe_md **lsmp)
 868 {
 869         struct lu_env *env;
 870         struct echo_thread_info *info;
 871         struct echo_object_conf *conf;
 872         struct lov_stripe_md    *lsm;
 873         struct echo_object *eco;
 874         struct cl_object   *obj;
 875         struct lu_fid *fid;
 876         int refcheck;
 877         ENTRY;
 878
 879         LASSERT(lsmp);
 880         lsm = *lsmp;
 881         LASSERT(lsm);
 882         LASSERT(lsm->lsm_object_id);
 883
 884         env = cl_env_get(&refcheck);
 885         if (IS_ERR(env))
 886                 RETURN((void *)env);
 887
 888         info = echo_env_info(env);
 889         conf = &info->eti_conf;
 890         if (d->ed_next) {
 891                 if (!d->ed_next_islov) {
 892                         struct lov_oinfo *oinfo = lsm->lsm_oinfo[0];
 893                         LASSERT(oinfo != NULL);
 894                         oinfo->loi_id = lsm->lsm_object_id;
 895                         oinfo->loi_gr = lsm->lsm_object_gr;
 896                         conf->eoc_cl.u.coc_oinfo = oinfo;
 897                 } else {
 898                         struct lustre_md *md;
 899                         md = &info->eti_md;
 900                         memset(md, 0, sizeof *md);
 901                         md->lsm = lsm;
 902                         conf->eoc_cl.u.coc_md = md;
 903                 }
 904         }
 905         conf->eoc_md = lsmp;
 906
 907         fid  = &info->eti_fid;
 908         lsm2fid(lsm, fid);
 909
 910         obj = cl_object_find(env, echo_dev2cl(d), fid, &conf->eoc_cl);
 911         if (IS_ERR(obj))
 912                 GOTO(out, eco = (void*)obj);
 913
 914         eco = cl2echo_obj(obj);
 915         if (eco->eo_deleted) {
 916                 cl_object_put(env, obj);
 917                 eco = ERR_PTR(-EAGAIN);
 918         }
 919
 920 out:
 921         cl_env_put(env, &refcheck);
 922         RETURN(eco);
 923 }
 924
 925 static int cl_echo_object_put(struct echo_object *eco)
 926 {
 927         struct lu_env *env;
 928         struct cl_object *obj = echo_obj2cl(eco);
 929         int refcheck;
 930         ENTRY;
 931
 932         env = cl_env_get(&refcheck);
 933         if (IS_ERR(env))
 934                 RETURN(PTR_ERR(env));
 935
 936         /* an external function to kill an object? */
 937         if (eco->eo_deleted) {
 938                 struct lu_object_header *loh = obj->co_lu.lo_header;
 939                 LASSERT(&eco->eo_hdr == luh2coh(loh));
 940                 set_bit(LU_OBJECT_HEARD_BANSHEE, &loh->loh_flags);
 941                 cl_object_prune(env, obj);
 942         }
 943
 944         cl_object_put(env, obj);
 945         cl_env_put(env, &refcheck);
 946         RETURN(0);
 947 }
 948
 949 static int cl_echo_enqueue(struct echo_object *eco, obd_off start, obd_off end,
 950                            int mode, __u64 *cookie)
 951 {
 952         struct lu_env *env;
 953         struct cl_lock *lck;
 954         struct echo_thread_info *info;
 955         struct cl_io *io;
 956         struct cl_lock_descr *descr;
 957         struct cl_object *obj = echo_obj2cl(eco);
 958         int refcheck;
 959         int result;
 960         ENTRY;
 961
 962         env = cl_env_get(&refcheck);
 963         if (IS_ERR(env))
 964                 RETURN(PTR_ERR(env));
 965
 966         info = echo_env_info(env);
 967         descr = &info->eti_descr;
 968         descr->cld_obj   = obj;
 969         descr->cld_start = cl_index(obj, start);
 970         descr->cld_end   = cl_index(obj, end);
 971         descr->cld_mode  = mode == LCK_PW ? CLM_WRITE : CLM_READ;
 972
 973         io = &info->eti_io;
 974         io->ci_obj = obj;
 975         result = cl_io_init(env, io, CIT_MISC, obj);
 976         if (result < 0)
 977                 GOTO(out, result);
 978         LASSERT(result == 0);
 979
 980         result = -ENOMEM;
 981         lck = cl_lock_request(env, io, descr, CEF_ASYNC, "ec enqueue", eco);
 982         if (lck) {
 983                 struct echo_client_obd *ec = eco->eo_dev->ed_ec;
 984                 struct echo_lock *el;
 985
 986                 result = cl_wait(env, lck);
 987                 if (result == 0) {
 988                         el = cl2echo_lock(cl_lock_at(lck, &echo_device_type));
 989                         spin_lock(&ec->ec_lock);
 990                         list_add(&el->el_chain, &ec->ec_locks);
 991                         *cookie = el->el_cookie = ++ec->ec_unique;
 992                         spin_unlock(&ec->ec_lock);
 993                 } else
 994                         cl_lock_release(env, lck, "ec enqueue", cfs_current());
 995         }
 996         cl_io_fini(env, io);
 997
 998         EXIT;
 999 out:
1000         cl_env_put(env, &refcheck);
1001         return result;
1002 }
1003
1004 static int cl_echo_cancel(struct echo_device *ed, __u64 cookie)
1005 {
1006         struct echo_client_obd *ec = ed->ed_ec;
1007         struct echo_lock       *ecl = NULL;
1008         struct list_head       *el;
1009         int found = 0;
1010         int result;
1011
1012         struct lu_env *env;
1013         int refcheck;
1014         ENTRY;
1015
1016         env = cl_env_get(&refcheck);
1017         if (IS_ERR(env))
1018                 RETURN(PTR_ERR(env));
1019
1020         spin_lock (&ec->ec_lock);
1021         list_for_each (el, &ec->ec_locks) {
1022                 ecl = list_entry (el, struct echo_lock, el_chain);
1023                 CDEBUG(D_INFO, "ecl: %p, cookie: %llx\n", ecl, ecl->el_cookie);
1024                 found = (ecl->el_cookie == cookie);
1025                 if (found) {
1026                         list_del_init(&ecl->el_chain);
1027                         break;
1028                 }
1029         }
1030         spin_unlock (&ec->ec_lock);
1031
1032         result = -ENOENT;
1033         if (found) {
1034                 struct cl_lock *clk = echo_lock2cl(ecl);
1035
1036                 cl_lock_get(clk);
1037                 cl_unuse(env, clk);
1038                 cl_lock_release(env, clk, "ec enqueue", ecl->el_object);
1039
1040                 cl_lock_mutex_get(env, clk);
1041                 cl_lock_cancel(env, clk);
1042                 cl_lock_delete(env, clk);
1043                 cl_lock_mutex_put(env, clk);
1044                 cl_lock_put(env, clk);
1045                 result = 0;
1046         }
1047         cl_env_put(env, &refcheck);
1048         RETURN(result);
1049 }
1050
1051 static int cl_echo_async_brw(const struct lu_env *env, struct cl_io *io,
1052                              enum cl_req_type unused, struct cl_2queue *queue)
1053 {
1054         struct cl_page *clp;
1055         struct cl_page *temp;
1056         int result = 0;
1057         ENTRY;
1058
1059         cl_page_list_splice(&queue->c2_qin, &queue->c2_qout);
1060         cl_page_list_for_each_safe(clp, temp, &queue->c2_qout) {
1061                 int rc;
1062                 rc = cl_page_cache_add(env, io, clp, CRT_WRITE);
1063                 if (rc == 0)
1064                         continue;
1065                 cl_page_list_move(&queue->c2_qin, &queue->c2_qout, clp);
1066                 result = result ?: rc;
1067         }
1068         RETURN(list_empty(&queue->c2_qout.pl_pages) ? result : 0);
1069 }
1070
1071 static int cl_echo_object_brw(struct echo_object *eco, int rw, obd_off offset,
1072                               cfs_page_t **pages, int npages, int async)
1073 {
1074         struct lu_env           *env;
1075         struct echo_thread_info *info;
1076         struct cl_object        *obj = echo_obj2cl(eco);
1077         struct echo_device      *ed  = eco->eo_dev;
1078         struct cl_sync_io       *anchor;
1079         struct cl_2queue        *queue;
1080         struct cl_io            *io;
1081         struct cl_page          *clp;
1082         struct echo_page        *ep;
1083
1084         int page_size = cl_page_size(obj);
1085         int refcheck;
1086         int rc;
1087         int i;
1088         ENTRY;
1089
1090         LASSERT(ed->ed_next != NULL);
1091         env = cl_env_get(&refcheck);
1092         if (IS_ERR(env))
1093                 RETURN(PTR_ERR(env));
1094
1095         info    = echo_env_info(env);
1096         io      = &info->eti_io;
1097         anchor  = &info->eti_anchor;
1098         queue   = &info->eti_queue;
1099
1100         cl_sync_io_init(anchor, npages);
1101         cl_2queue_init(queue);
1102         rc = cl_io_init(env, io, CIT_MISC, obj);
1103         if (rc < 0)
1104                 GOTO(out, rc);
1105         LASSERT(rc == 0);
1106
1107         for (i = 0; i < npages; i++) {
1108                 LASSERT(pages[i]);
1109                 clp = cl_page_find(env, obj, cl_index(obj, offset),
1110                                    pages[i], CPT_TRANSIENT);
1111                 if (IS_ERR(clp)) {
1112                         rc = PTR_ERR(clp);
1113                         break;
1114                 }
1115                 LASSERT(clp->cp_type == CPT_TRANSIENT);
1116
1117                 rc = cl_page_own(env, io, clp);
1118                 if (rc) {
1119                         LASSERT(clp->cp_state == CPS_FREEING);
1120                         cl_page_put(env, clp);
1121                         break;
1122                 }
1123
1124                 ep = cl2echo_page(cl_page_at(clp, &echo_device_type));
1125                 ep->ep_sync_io = anchor;
1126                 cl_2queue_add(queue, clp);
1127
1128                 /* drop the reference count for cl_page_find, so that the page
1129                  * will be freed in cl_2queue_fini. */
1130                 cl_page_put(env, clp);
1131                 offset += page_size;
1132         }
1133
1134         if (rc == 0) {
1135                 enum cl_req_type typ = rw == READ ? CRT_READ : CRT_WRITE;
1136
1137                 async = async && (typ == CRT_WRITE);
1138                 if (async)
1139                         rc = cl_echo_async_brw(env, io, typ, queue);
1140                 else
1141                         rc = cl_io_submit_rw(env, io,typ, queue, CRP_NORMAL);
1142                 CDEBUG(D_INFO, "echo_client %s write returns %d\n",
1143                        async ? "async" : "sync", rc);
1144                 if (rc == 0) {
1145                         /*
1146                          * If some pages weren't sent for any reason (e.g.,
1147                          * direct-io read found up-to-date pages in the
1148                          * cache), count them as completed to avoid infinite
1149                          * wait.
1150                          */
1151                         cl_page_list_for_each(clp, &queue->c2_qin)
1152                                 cl_sync_io_note(anchor, +1);
1153                         /* wait for the IO to be finished. */
1154                         rc = cl_sync_io_wait(env, io, &queue->c2_qout, anchor);
1155                 }
1156         }
1157
1158         cl_2queue_discard(env, io, queue);
1159         cl_2queue_disown(env, io, queue);
1160         cl_2queue_fini(env, queue);
1161         cl_io_fini(env, io);
1162
1163         EXIT;
1164 out:
1165         cl_env_put(env, &refcheck);
1166         return rc;
1167 }
1168 /** @} echo_exports */
1169
1170
1171 static obd_id last_object_id;
1172
1173 static int
1174 echo_copyout_lsm (struct lov_stripe_md *lsm, void *_ulsm, int ulsm_nob)
1175 {
1176         struct lov_stripe_md *ulsm = _ulsm;
1177         int nob, i;
1178
1179         nob = offsetof (struct lov_stripe_md, lsm_oinfo[lsm->lsm_stripe_count]);
1180         if (nob > ulsm_nob)
1181                 return (-EINVAL);
1182
1183         if (copy_to_user (ulsm, lsm, sizeof(ulsm)))
1184                 return (-EFAULT);
1185
1186         for (i = 0; i < lsm->lsm_stripe_count; i++) {
1187                 if (copy_to_user (ulsm->lsm_oinfo[i], lsm->lsm_oinfo[i],
1188                                   sizeof(lsm->lsm_oinfo[0])))
1189                         return (-EFAULT);
1190         }
1191         return 0;
1192 }
1193
1194 static int
1195 echo_copyin_lsm (struct echo_device *ed, struct lov_stripe_md *lsm,
1196                  void *ulsm, int ulsm_nob)
1197 {
1198         struct echo_client_obd *ec = ed->ed_ec;
1199         int                     i;
1200
1201         if (ulsm_nob < sizeof (*lsm))
1202                 return (-EINVAL);
1203
1204         if (copy_from_user (lsm, ulsm, sizeof (*lsm)))
1205                 return (-EFAULT);
1206
1207         if (lsm->lsm_stripe_count > ec->ec_nstripes ||
1208             lsm->lsm_magic != LOV_MAGIC ||
1209             (lsm->lsm_stripe_size & (~CFS_PAGE_MASK)) != 0 ||
1210             ((__u64)lsm->lsm_stripe_size * lsm->lsm_stripe_count > ~0UL))
1211                 return (-EINVAL);
1212
1213
1214         for (i = 0; i < lsm->lsm_stripe_count; i++) {
1215                 if (copy_from_user(lsm->lsm_oinfo[i],
1216                                    ((struct lov_stripe_md *)ulsm)->lsm_oinfo[i],
1217                                    sizeof(lsm->lsm_oinfo[0])))
1218                         return (-EFAULT);
1219         }
1220         return (0);
1221 }
1222
1223 static int echo_create_object(struct echo_device *ed, int on_target,
1224                               struct obdo *oa, void *ulsm, int ulsm_nob,
1225                               struct obd_trans_info *oti)
1226 {
1227         struct echo_object     *eco;
1228         struct echo_client_obd *ec = ed->ed_ec;
1229         struct lov_stripe_md   *lsm = NULL;
1230         int                     rc;
1231         int                     created = 0;
1232         ENTRY;
1233
1234         if ((oa->o_valid & OBD_MD_FLID) == 0 && /* no obj id */
1235             (on_target ||                       /* set_stripe */
1236              ec->ec_nstripes != 0)) {           /* LOV */
1237                 CERROR ("No valid oid\n");
1238                 RETURN(-EINVAL);
1239         }
1240
1241         rc = obd_alloc_memmd(ec->ec_exp, &lsm);
1242         if (rc < 0) {
1243                 CERROR("Cannot allocate md, rc = %d\n", rc);
1244                 GOTO(failed, rc);
1245         }
1246
1247         if (ulsm != NULL) {
1248                 int i, idx;
1249
1250                 rc = echo_copyin_lsm (ed, lsm, ulsm, ulsm_nob);
1251                 if (rc != 0)
1252                         GOTO(failed, rc);
1253
1254                 if (lsm->lsm_stripe_count == 0)
1255                         lsm->lsm_stripe_count = ec->ec_nstripes;
1256
1257                 if (lsm->lsm_stripe_size == 0)
1258                         lsm->lsm_stripe_size = CFS_PAGE_SIZE;
1259
1260                 idx = ll_rand();
1261
1262                 /* setup stripes: indices + default ids if required */
1263                 for (i = 0; i < lsm->lsm_stripe_count; i++) {
1264                         if (lsm->lsm_oinfo[i]->loi_id == 0)
1265                                 lsm->lsm_oinfo[i]->loi_id = lsm->lsm_object_id;
1266
1267                         lsm->lsm_oinfo[i]->loi_ost_idx =
1268                                 (idx + i) % ec->ec_nstripes;
1269                 }
1270         }
1271
1272         /* setup object ID here for !on_target and LOV hint */
1273         if (oa->o_valid & OBD_MD_FLID)
1274                 lsm->lsm_object_id = oa->o_id;
1275
1276         if (lsm->lsm_object_id == 0)
1277                 lsm->lsm_object_id = ++last_object_id;
1278
1279         rc = 0;
1280         if (on_target) {
1281                 oa->o_gr = FILTER_GROUP_ECHO;
1282                 oa->o_valid |= OBD_MD_FLGROUP;
1283
1284                 rc = obd_create(ec->ec_exp, oa, &lsm, oti);
1285                 if (rc != 0) {
1286                         CERROR("Cannot create objects, rc = %d\n", rc);
1287                         GOTO(failed, rc);
1288                 }
1289                 created = 1;
1290         }
1291
1292         /* See what object ID we were given */
1293         oa->o_id = lsm->lsm_object_id;
1294         oa->o_valid |= OBD_MD_FLID;
1295
1296         eco = cl_echo_object_find(ed, &lsm);
1297         if (IS_ERR(eco))
1298                 GOTO(failed, rc = PTR_ERR(eco));
1299         cl_echo_object_put(eco);
1300
1301         CDEBUG(D_INFO, "oa->o_id = %lx\n", (long)oa->o_id);
1302         EXIT;
1303
1304  failed:
1305         if (created && rc)
1306                 obd_destroy(ec->ec_exp, oa, lsm, oti, NULL, NULL);
1307         if (lsm)
1308                 obd_free_memmd(ec->ec_exp, &lsm);
1309         if (rc)
1310                 CERROR("create object failed with rc = %d\n", rc);
1311         return (rc);
1312 }
1313
1314 static int echo_get_object(struct echo_object **ecop, struct echo_device *ed,
1315                            struct obdo *oa)
1316 {
1317         struct echo_client_obd *ec  = ed->ed_ec;
1318         struct lov_stripe_md   *lsm = NULL;
1319         struct echo_object     *eco;
1320         int                     rc;
1321         ENTRY;
1322
1323         if ((oa->o_valid & OBD_MD_FLID) == 0 ||
1324             oa->o_id == 0)  /* disallow use of object id 0 */
1325         {
1326                 CERROR ("No valid oid\n");
1327                 RETURN(-EINVAL);
1328         }
1329
1330         rc = obd_alloc_memmd(ec->ec_exp, &lsm);
1331         if (rc < 0)
1332                 RETURN(rc);
1333
1334         lsm->lsm_object_id = oa->o_id;
1335         if (oa->o_valid & OBD_MD_FLGROUP)
1336                 lsm->lsm_object_gr = oa->o_gr;
1337         else
1338                 lsm->lsm_object_gr = FILTER_GROUP_ECHO;
1339
1340         rc = 0;
1341         eco = cl_echo_object_find(ed, &lsm);
1342         if (!IS_ERR(eco))
1343                 *ecop = eco;
1344         else
1345                 rc = PTR_ERR(eco);
1346         if (lsm)
1347                 obd_free_memmd(ec->ec_exp, &lsm);
1348         RETURN(rc);
1349 }
1350
1351 static void echo_put_object(struct echo_object *eco)
1352 {
1353         if (cl_echo_object_put(eco))
1354                 CERROR("echo client: drop an object failed");
1355 }
1356
1357 static void
1358 echo_get_stripe_off_id (struct lov_stripe_md *lsm, obd_off *offp, obd_id *idp)
1359 {
1360         unsigned long stripe_count;
1361         unsigned long stripe_size;
1362         unsigned long width;
1363         unsigned long woffset;
1364         int           stripe_index;
1365         obd_off       offset;
1366
1367         if (lsm->lsm_stripe_count <= 1)
1368                 return;
1369
1370         offset       = *offp;
1371         stripe_size  = lsm->lsm_stripe_size;
1372         stripe_count = lsm->lsm_stripe_count;
1373
1374         /* width = # bytes in all stripes */
1375         width = stripe_size * stripe_count;
1376
1377         /* woffset = offset within a width; offset = whole number of widths */
1378         woffset = do_div (offset, width);
1379
1380         stripe_index = woffset / stripe_size;
1381
1382         *idp = lsm->lsm_oinfo[stripe_index]->loi_id;
1383         *offp = offset * stripe_size + woffset % stripe_size;
1384 }
1385
1386 static void
1387 echo_client_page_debug_setup(struct lov_stripe_md *lsm,
1388                              cfs_page_t *page, int rw, obd_id id,
1389                              obd_off offset, obd_off count)
1390 {
1391         char    *addr;
1392         obd_off  stripe_off;
1393         obd_id   stripe_id;
1394         int      delta;
1395
1396         /* no partial pages on the client */
1397         LASSERT(count == CFS_PAGE_SIZE);
1398
1399         addr = cfs_kmap(page);
1400
1401         for (delta = 0; delta < CFS_PAGE_SIZE; delta += OBD_ECHO_BLOCK_SIZE) {
1402                 if (rw == OBD_BRW_WRITE) {
1403                         stripe_off = offset + delta;
1404                         stripe_id = id;
1405                         echo_get_stripe_off_id(lsm, &stripe_off, &stripe_id);
1406                 } else {
1407                         stripe_off = 0xdeadbeef00c0ffeeULL;
1408                         stripe_id = 0xdeadbeef00c0ffeeULL;
1409                 }
1410                 block_debug_setup(addr + delta, OBD_ECHO_BLOCK_SIZE,
1411                                   stripe_off, stripe_id);
1412         }
1413
1414         cfs_kunmap(page);
1415 }
1416
1417 static int echo_client_page_debug_check(struct lov_stripe_md *lsm,
1418                                         cfs_page_t *page, obd_id id,
1419                                         obd_off offset, obd_off count)
1420 {
1421         obd_off stripe_off;
1422         obd_id  stripe_id;
1423         char   *addr;
1424         int     delta;
1425         int     rc;
1426         int     rc2;
1427
1428         /* no partial pages on the client */
1429         LASSERT(count == CFS_PAGE_SIZE);
1430
1431         addr = cfs_kmap(page);
1432
1433         for (rc = delta = 0; delta < CFS_PAGE_SIZE; delta += OBD_ECHO_BLOCK_SIZE) {
1434                 stripe_off = offset + delta;
1435                 stripe_id = id;
1436                 echo_get_stripe_off_id (lsm, &stripe_off, &stripe_id);
1437
1438                 rc2 = block_debug_check("test_brw",
1439                                         addr + delta, OBD_ECHO_BLOCK_SIZE,
1440                                         stripe_off, stripe_id);
1441                 if (rc2 != 0) {
1442                         CERROR ("Error in echo object "LPX64"\n", id);
1443                         rc = rc2;
1444                 }
1445         }
1446
1447         cfs_kunmap(page);
1448         return rc;
1449 }
1450
1451 static int echo_client_kbrw(struct echo_device *ed, int rw, struct obdo *oa,
1452                             struct echo_object *eco, obd_off offset,
1453                             obd_size count, int async,
1454                             struct obd_trans_info *oti)
1455 {
1456         struct echo_client_obd *ec  = ed->ed_ec;
1457         struct lov_stripe_md   *lsm = eco->eo_lsm;
1458         obd_count               npages;
1459         struct brw_page        *pga;
1460         struct brw_page        *pgp;
1461         cfs_page_t            **pages;
1462         obd_off                 off;
1463         int                     i;
1464         int                     rc;
1465         int                     verify;
1466         int                     gfp_mask;
1467         ENTRY;
1468
1469         verify = ((oa->o_id) != ECHO_PERSISTENT_OBJID &&
1470                   (oa->o_valid & OBD_MD_FLFLAGS) != 0 &&
1471                   (oa->o_flags & OBD_FL_DEBUG_CHECK) != 0);
1472
1473         gfp_mask = ((oa->o_id & 2) == 0) ? CFS_ALLOC_STD : CFS_ALLOC_HIGHUSER;
1474
1475         LASSERT(rw == OBD_BRW_WRITE || rw == OBD_BRW_READ);
1476         LASSERT(lsm != NULL);
1477         LASSERT(lsm->lsm_object_id == oa->o_id);
1478
1479         if (count <= 0 ||
1480             (count & (~CFS_PAGE_MASK)) != 0)
1481                 RETURN(-EINVAL);
1482
1483         /* XXX think again with misaligned I/O */
1484         npages = count >> CFS_PAGE_SHIFT;
1485
1486         OBD_ALLOC(pga, npages * sizeof(*pga));
1487         if (pga == NULL)
1488                 RETURN(-ENOMEM);
1489
1490         OBD_ALLOC(pages, npages * sizeof(*pages));
1491         if (pages == NULL) {
1492                 OBD_FREE(pga, npages * sizeof(*pga));
1493                 RETURN(-ENOMEM);
1494         }
1495
1496         for (i = 0, pgp = pga, off = offset;
1497              i < npages;
1498              i++, pgp++, off += CFS_PAGE_SIZE) {
1499
1500                 LASSERT (pgp->pg == NULL);      /* for cleanup */
1501
1502                 rc = -ENOMEM;
1503                 OBD_PAGE_ALLOC(pgp->pg, gfp_mask);
1504                 if (pgp->pg == NULL)
1505                         goto out;
1506
1507                 pages[i] = pgp->pg;
1508                 pgp->count = CFS_PAGE_SIZE;
1509                 pgp->off = off;
1510                 pgp->flag = 0;
1511
1512                 if (verify)
1513                         echo_client_page_debug_setup(lsm, pgp->pg, rw,
1514                                                      oa->o_id, off, pgp->count);
1515         }
1516
1517         if (ed->ed_next == NULL) {
1518                 struct obd_info oinfo = { { { 0 } } };
1519                 oinfo.oi_oa = oa;
1520                 oinfo.oi_md = lsm;
1521                 rc = obd_brw(rw, ec->ec_exp, &oinfo, npages, pga, oti);
1522         } else
1523                 rc = cl_echo_object_brw(eco, rw, offset, pages, npages, async);
1524
1525  out:
1526         if (rc != 0 || rw != OBD_BRW_READ)
1527                 verify = 0;
1528
1529         for (i = 0, pgp = pga; i < npages; i++, pgp++) {
1530                 if (pgp->pg == NULL)
1531                         continue;
1532
1533                 if (verify) {
1534                         int vrc;
1535                         vrc = echo_client_page_debug_check(lsm, pgp->pg, oa->o_id,
1536                                                            pgp->off, pgp->count);
1537                         if (vrc != 0 && rc == 0)
1538                                 rc = vrc;
1539                 }
1540                 OBD_PAGE_FREE(pgp->pg);
1541         }
1542         OBD_FREE(pga, npages * sizeof(*pga));
1543         OBD_FREE(pages, npages * sizeof(*pages));
1544         RETURN(rc);
1545 }
1546
1547 static int echo_client_prep_commit(struct obd_export *exp, int rw,
1548                                    struct obdo *oa, struct echo_object *eco,
1549                                    obd_off offset, obd_size count,
1550                                    obd_size batch, struct obd_trans_info *oti)
1551 {
1552         struct lov_stripe_md *lsm = eco->eo_lsm;
1553         struct obd_ioobj ioo;
1554         struct niobuf_local *lnb;
1555         struct niobuf_remote *rnb;
1556         obd_off off;
1557         obd_size npages, tot_pages;
1558         int i, ret = 0;
1559         ENTRY;
1560
1561         if (count <= 0 || (count & (~CFS_PAGE_MASK)) != 0 ||
1562             (lsm != NULL && lsm->lsm_object_id != oa->o_id))
1563                 RETURN(-EINVAL);
1564
1565         npages = batch >> CFS_PAGE_SHIFT;
1566         tot_pages = count >> CFS_PAGE_SHIFT;
1567
1568         OBD_ALLOC(lnb, npages * sizeof(struct niobuf_local));
1569         OBD_ALLOC(rnb, npages * sizeof(struct niobuf_remote));
1570
1571         if (lnb == NULL || rnb == NULL)
1572                 GOTO(out, ret = -ENOMEM);
1573
1574         obdo_to_ioobj(oa, &ioo);
1575
1576         off = offset;
1577
1578         for(; tot_pages; tot_pages -= npages) {
1579                 int lpages;
1580
1581                 if (tot_pages < npages)
1582                         npages = tot_pages;
1583
1584                 for (i = 0; i < npages; i++, off += CFS_PAGE_SIZE) {
1585                         rnb[i].offset = off;
1586                         rnb[i].len = CFS_PAGE_SIZE;
1587                 }
1588
1589                 ioo.ioo_bufcnt = npages;
1590                 oti->oti_transno = 0;
1591
1592                 lpages = npages;
1593                 ret = obd_preprw(rw, exp, oa, 1, &ioo, rnb, &lpages, lnb, oti,
1594                                  NULL);
1595                 if (ret != 0)
1596                         GOTO(out, ret);
1597                 LASSERT(lpages == npages);
1598
1599                 for (i = 0; i < lpages; i++) {
1600                         cfs_page_t *page = lnb[i].page;
1601
1602                         /* read past eof? */
1603                         if (page == NULL && lnb[i].rc == 0)
1604                                 continue;
1605
1606                         if (oa->o_id == ECHO_PERSISTENT_OBJID ||
1607                             (oa->o_valid & OBD_MD_FLFLAGS) == 0 ||
1608                             (oa->o_flags & OBD_FL_DEBUG_CHECK) == 0)
1609                                 continue;
1610
1611                         if (rw == OBD_BRW_WRITE)
1612                                 echo_client_page_debug_setup(lsm, page, rw,
1613                                                              oa->o_id,
1614                                                              rnb[i].offset,
1615                                                              rnb[i].len);
1616                         else
1617                                 echo_client_page_debug_check(lsm, page,
1618                                                              oa->o_id,
1619                                                              rnb[i].offset,
1620                                                              rnb[i].len);
1621                 }
1622
1623                 ret = obd_commitrw(rw, exp, oa, 1,&ioo,rnb,npages,lnb,oti,ret);
1624                 if (ret != 0)
1625                         GOTO(out, ret);
1626         }
1627
1628 out:
1629         if (lnb)
1630                 OBD_FREE(lnb, npages * sizeof(struct niobuf_local));
1631         if (rnb)
1632                 OBD_FREE(rnb, npages * sizeof(struct niobuf_remote));
1633         RETURN(ret);
1634 }
1635
1636 static int echo_client_brw_ioctl(int rw, struct obd_export *exp,
1637                                  struct obd_ioctl_data *data)
1638 {
1639         struct obd_device *obd = class_exp2obd(exp);
1640         struct echo_device *ed = obd2echo_dev(obd);
1641         struct echo_client_obd *ec = ed->ed_ec;
1642         struct obd_trans_info dummy_oti = { .oti_thread = NULL };
1643         struct echo_object *eco;
1644         int rc;
1645         int async = 1;
1646         ENTRY;
1647
1648         rc = echo_get_object(&eco, ed, &data->ioc_obdo1);
1649         if (rc)
1650                 RETURN(rc);
1651
1652         data->ioc_obdo1.o_valid &= ~OBD_MD_FLHANDLE;
1653         data->ioc_obdo1.o_valid |= OBD_MD_FLGROUP;
1654         data->ioc_obdo1.o_gr = FILTER_GROUP_ECHO;
1655
1656         switch((long)data->ioc_pbuf1) {
1657         case 1:
1658                 async = 0;
1659                 /* fall through */
1660         case 2:
1661                 rc = echo_client_kbrw(ed, rw, &data->ioc_obdo1,
1662                                       eco, data->ioc_offset,
1663                                       data->ioc_count, async, &dummy_oti);
1664                 break;
1665         case 3:
1666                 rc = echo_client_prep_commit(ec->ec_exp, rw, &data->ioc_obdo1,
1667                                             eco, data->ioc_offset,
1668                                             data->ioc_count, data->ioc_plen1,
1669                                             &dummy_oti);
1670                 break;
1671         default:
1672                 rc = -EINVAL;
1673         }
1674         echo_put_object(eco);
1675         RETURN(rc);
1676 }
1677
1678 static int
1679 echo_client_enqueue(struct obd_export *exp, struct obdo *oa,
1680                     int mode, obd_off offset, obd_size nob)
1681 {
1682         struct echo_device     *ed = obd2echo_dev(exp->exp_obd);
1683         struct lustre_handle   *ulh = &oa->o_handle;
1684         struct echo_object     *eco;
1685         obd_off                 end;
1686         int                     rc;
1687         ENTRY;
1688
1689         if (ed->ed_next == NULL)
1690                 RETURN(-EOPNOTSUPP);
1691
1692         if (!(mode == LCK_PR || mode == LCK_PW))
1693                 RETURN(-EINVAL);
1694
1695         if ((offset & (~CFS_PAGE_MASK)) != 0 ||
1696             (nob & (~CFS_PAGE_MASK)) != 0)
1697                 RETURN(-EINVAL);
1698
1699         rc = echo_get_object (&eco, ed, oa);
1700         if (rc != 0)
1701                 RETURN(rc);
1702
1703         end = (nob == 0) ? ((obd_off) -1) : (offset + nob - 1);
1704         rc = cl_echo_enqueue(eco, offset, end, mode, &ulh->cookie);
1705         if (rc == 0) {
1706                 oa->o_valid |= OBD_MD_FLHANDLE;
1707                 CDEBUG(D_INFO, "Cookie is %llx\n", ulh->cookie);
1708         }
1709         echo_put_object(eco);
1710         RETURN(rc);
1711 }
1712
1713 static int
1714 echo_client_cancel(struct obd_export *exp, struct obdo *oa)
1715 {
1716         struct echo_device *ed     = obd2echo_dev(exp->exp_obd);
1717         __u64               cookie = oa->o_handle.cookie;
1718
1719         if ((oa->o_valid & OBD_MD_FLHANDLE) == 0)
1720                 return -EINVAL;
1721
1722         CDEBUG(D_INFO, "Cookie is %llx\n", cookie);
1723         return cl_echo_cancel(ed, cookie);
1724 }
1725
1726 static int
1727 echo_client_iocontrol(unsigned int cmd, struct obd_export *exp,
1728                       int len, void *karg, void *uarg)
1729 {
1730         struct obd_device      *obd = exp->exp_obd;
1731         struct echo_device     *ed = obd2echo_dev(obd);
1732         struct echo_client_obd *ec = ed->ed_ec;
1733         struct echo_object     *eco;
1734         struct obd_ioctl_data  *data = karg;
1735         struct obd_trans_info   dummy_oti;
1736         struct oti_req_ack_lock *ack_lock;
1737         struct obdo            *oa;
1738         int                     rw = OBD_BRW_READ;
1739         int                     rc = 0;
1740         int                     i;
1741         ENTRY;
1742
1743         unlock_kernel();
1744
1745         memset(&dummy_oti, 0, sizeof(dummy_oti));
1746
1747         switch (cmd) {
1748         case OBD_IOC_CREATE:                    /* may create echo object */
1749                 if (!cfs_capable(CFS_CAP_SYS_ADMIN))
1750                         GOTO (out, rc = -EPERM);
1751
1752                 rc = echo_create_object (ed, 1, &data->ioc_obdo1,
1753                                          data->ioc_pbuf1, data->ioc_plen1,
1754                                          &dummy_oti);
1755                 GOTO(out, rc);
1756
1757         case OBD_IOC_DESTROY:
1758                 if (!cfs_capable(CFS_CAP_SYS_ADMIN))
1759                         GOTO (out, rc = -EPERM);
1760
1761                 rc = echo_get_object (&eco, ed, &data->ioc_obdo1);
1762                 if (rc == 0) {
1763                         oa = &data->ioc_obdo1;
1764                         oa->o_gr = FILTER_GROUP_ECHO;
1765                         oa->o_valid |= OBD_MD_FLGROUP;
1766                         rc = obd_destroy(ec->ec_exp, oa, eco->eo_lsm,
1767                                          &dummy_oti, NULL, NULL);
1768                         if (rc == 0)
1769                                 eco->eo_deleted = 1;
1770                         echo_put_object(eco);
1771                 }
1772                 GOTO(out, rc);
1773
1774         case OBD_IOC_GETATTR:
1775                 rc = echo_get_object (&eco, ed, &data->ioc_obdo1);
1776                 if (rc == 0) {
1777                         struct obd_info oinfo = { { { 0 } } };
1778                         oinfo.oi_md = eco->eo_lsm;
1779                         oinfo.oi_oa = &data->ioc_obdo1;
1780                         rc = obd_getattr(ec->ec_exp, &oinfo);
1781                         echo_put_object(eco);
1782                 }
1783                 GOTO(out, rc);
1784
1785         case OBD_IOC_SETATTR:
1786                 if (!cfs_capable(CFS_CAP_SYS_ADMIN))
1787                         GOTO (out, rc = -EPERM);
1788
1789                 rc = echo_get_object (&eco, ed, &data->ioc_obdo1);
1790                 if (rc == 0) {
1791                         struct obd_info oinfo = { { { 0 } } };
1792                         oinfo.oi_oa = &data->ioc_obdo1;
1793                         oinfo.oi_md = eco->eo_lsm;
1794
1795                         rc = obd_setattr(ec->ec_exp, &oinfo, NULL);
1796                         echo_put_object(eco);
1797                 }
1798                 GOTO(out, rc);
1799
1800         case OBD_IOC_BRW_WRITE:
1801                 if (!cfs_capable(CFS_CAP_SYS_ADMIN))
1802                         GOTO (out, rc = -EPERM);
1803
1804                 rw = OBD_BRW_WRITE;
1805                 /* fall through */
1806         case OBD_IOC_BRW_READ:
1807                 rc = echo_client_brw_ioctl(rw, exp, data);
1808                 GOTO(out, rc);
1809
1810         case ECHO_IOC_GET_STRIPE:
1811                 rc = echo_get_object(&eco, ed, &data->ioc_obdo1);
1812                 if (rc == 0) {
1813                         rc = echo_copyout_lsm(eco->eo_lsm, data->ioc_pbuf1,
1814                                               data->ioc_plen1);
1815                         echo_put_object(eco);
1816                 }
1817                 GOTO(out, rc);
1818
1819         case ECHO_IOC_SET_STRIPE:
1820                 if (!cfs_capable(CFS_CAP_SYS_ADMIN))
1821                         GOTO (out, rc = -EPERM);
1822
1823                 if (data->ioc_pbuf1 == NULL) {  /* unset */
1824                         rc = echo_get_object(&eco, ed, &data->ioc_obdo1);
1825                         if (rc == 0) {
1826                                 eco->eo_deleted = 1;
1827                                 echo_put_object(eco);
1828                         }
1829                 } else {
1830                         rc = echo_create_object(ed, 0, &data->ioc_obdo1,
1831                                                 data->ioc_pbuf1,
1832                                                 data->ioc_plen1, &dummy_oti);
1833                 }
1834                 GOTO (out, rc);
1835
1836         case ECHO_IOC_ENQUEUE:
1837                 if (!cfs_capable(CFS_CAP_SYS_ADMIN))
1838                         GOTO (out, rc = -EPERM);
1839
1840                 rc = echo_client_enqueue(exp, &data->ioc_obdo1,
1841                                          data->ioc_conn1, /* lock mode */
1842                                          data->ioc_offset,
1843                                          data->ioc_count);/*extent*/
1844                 GOTO (out, rc);
1845
1846         case ECHO_IOC_CANCEL:
1847                 rc = echo_client_cancel(exp, &data->ioc_obdo1);
1848                 GOTO (out, rc);
1849
1850         default:
1851                 CERROR ("echo_ioctl(): unrecognised ioctl %#x\n", cmd);
1852                 GOTO (out, rc = -ENOTTY);
1853         }
1854
1855         EXIT;
1856  out:
1857
1858         /* XXX this should be in a helper also called by target_send_reply */
1859         for (ack_lock = dummy_oti.oti_ack_locks, i = 0; i < 4;
1860              i++, ack_lock++) {
1861                 if (!ack_lock->mode)
1862                         break;
1863                 ldlm_lock_decref(&ack_lock->lock, ack_lock->mode);
1864         }
1865
1866         lock_kernel();
1867
1868         return rc;
1869 }
1870
1871 static int echo_client_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
1872 {
1873         struct echo_client_obd *ec = &obddev->u.echo_client;
1874         struct obd_device *tgt;
1875         struct obd_uuid echo_uuid = { "ECHO_UUID" };
1876         struct obd_connect_data *ocd = NULL;
1877         int rc;
1878         ENTRY;
1879
1880         if (lcfg->lcfg_bufcount < 2 || LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
1881                 CERROR("requires a TARGET OBD name\n");
1882                 RETURN(-EINVAL);
1883         }
1884
1885         tgt = class_name2obd(lustre_cfg_string(lcfg, 1));
1886         if (!tgt || !tgt->obd_attached || !tgt->obd_set_up) {
1887                 CERROR("device not attached or not set up (%s)\n",
1888                        lustre_cfg_string(lcfg, 1));
1889                 RETURN(-EINVAL);
1890         }
1891
1892         spin_lock_init (&ec->ec_lock);
1893         CFS_INIT_LIST_HEAD (&ec->ec_objects);
1894         CFS_INIT_LIST_HEAD (&ec->ec_locks);
1895         ec->ec_unique = 0;
1896         ec->ec_nstripes = 0;
1897
1898         OBD_ALLOC(ocd, sizeof(*ocd));
1899         if (ocd == NULL) {
1900                 CERROR("Can't alloc ocd connecting to %s\n",
1901                        lustre_cfg_string(lcfg, 1));
1902                 return -ENOMEM;
1903         }
1904
1905         ocd->ocd_connect_flags = OBD_CONNECT_VERSION | OBD_CONNECT_REQPORTAL |
1906                                  OBD_CONNECT_GRANT;
1907         ocd->ocd_version = LUSTRE_VERSION_CODE;
1908         ocd->ocd_group = FILTER_GROUP_ECHO;
1909
1910         rc = obd_connect(NULL, &ec->ec_exp, tgt, &echo_uuid, ocd, NULL);
1911
1912         OBD_FREE(ocd, sizeof(*ocd));
1913
1914         if (rc != 0) {
1915                 CERROR("fail to connect to device %s\n",
1916                        lustre_cfg_string(lcfg, 1));
1917                 return (rc);
1918         }
1919
1920         RETURN(rc);
1921 }
1922
1923 static int echo_client_cleanup(struct obd_device *obddev)
1924 {
1925         struct echo_client_obd *ec = &obddev->u.echo_client;
1926         int rc;
1927         ENTRY;
1928
1929         if (!list_empty(&obddev->obd_exports)) {
1930                 CERROR("still has clients!\n");
1931                 RETURN(-EBUSY);
1932         }
1933
1934         rc = obd_disconnect(ec->ec_exp);
1935         if (rc != 0)
1936                 CERROR("fail to disconnect device: %d\n", rc);
1937
1938         RETURN(rc);
1939 }
1940
1941 static int echo_client_connect(const struct lu_env *env,
1942                                struct obd_export **exp,
1943                                struct obd_device *src, struct obd_uuid *cluuid,
1944                                struct obd_connect_data *data, void *localdata)
1945 {
1946         int                rc;
1947         struct lustre_handle conn = { 0 };
1948
1949         ENTRY;
1950         rc = class_connect(&conn, src, cluuid);
1951         if (rc == 0) {
1952                 *exp = class_conn2export(&conn);
1953         }
1954
1955         RETURN (rc);
1956 }
1957
1958 static int echo_client_disconnect(struct obd_export *exp)
1959 {
1960 #if 0
1961         struct obd_device      *obd;
1962         struct echo_client_obd *ec;
1963         struct ec_lock         *ecl;
1964 #endif
1965         int                     rc;
1966         ENTRY;
1967
1968         if (exp == NULL)
1969                 GOTO(out, rc = -EINVAL);
1970
1971 #if 0
1972         obd = exp->exp_obd;
1973         ec = &obd->u.echo_client;
1974
1975         /* no more contention on export's lock list */
1976         while (!list_empty (&exp->exp_ec_data.eced_locks)) {
1977                 ecl = list_entry (exp->exp_ec_data.eced_locks.next,
1978                                   struct ec_lock, ecl_exp_chain);
1979                 list_del (&ecl->ecl_exp_chain);
1980
1981                 rc = obd_cancel(ec->ec_exp, ecl->ecl_object->eco_lsm,
1982                                  ecl->ecl_mode, &ecl->ecl_lock_handle);
1983
1984                 CDEBUG (D_INFO, "Cancel lock on object "LPX64" on disconnect "
1985                         "(%d)\n", ecl->ecl_object->eco_id, rc);
1986
1987                 echo_put_object (ecl->ecl_object);
1988                 OBD_FREE (ecl, sizeof (*ecl));
1989         }
1990 #endif
1991
1992         rc = class_disconnect(exp);
1993         GOTO(out, rc);
1994  out:
1995         return rc;
1996 }
1997
1998 static struct obd_ops echo_obd_ops = {
1999         .o_owner       = THIS_MODULE,
2000
2001 #if 0
2002         .o_setup       = echo_client_setup,
2003         .o_cleanup     = echo_client_cleanup,
2004 #endif
2005
2006         .o_iocontrol   = echo_client_iocontrol,
2007         .o_connect     = echo_client_connect,
2008         .o_disconnect  = echo_client_disconnect
2009 };
2010
2011 int echo_client_init(void)
2012 {
2013         struct lprocfs_static_vars lvars = { 0 };
2014         int rc;
2015
2016         lprocfs_echo_init_vars(&lvars);
2017         rc = class_register_type(&echo_obd_ops, NULL, lvars.module_vars,
2018                                  LUSTRE_ECHO_CLIENT_NAME, &echo_device_type);
2019         if (rc == 0)
2020                 lu_kmem_init(echo_caches);
2021         return rc;
2022 }
2023
2024 void echo_client_exit(void)
2025 {
2026         class_unregister_type(LUSTRE_ECHO_CLIENT_NAME);
2027         lu_kmem_fini(echo_caches);
2028 }
2029