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 /** \defgroup echo_client Echo Client
  54  * @{
  55  */
  56
  57 struct echo_device {
  58         struct cl_device        ed_cl;
  59         struct echo_client_obd *ed_ec;
  60
  61         struct cl_site          ed_site_myself;
  62         struct cl_site         *ed_site;
  63         struct lu_device       *ed_next;
  64         int                     ed_next_islov;
  65 };
  66
  67 struct echo_object {
  68         struct cl_object        eo_cl;
  69         struct cl_object_header eo_hdr;
  70
  71         struct echo_device     *eo_dev;
  72         cfs_list_t              eo_obj_chain;
  73         struct lov_stripe_md   *eo_lsm;
  74         cfs_atomic_t            eo_npages;
  75         int                     eo_deleted;
  76 };
  77
  78 struct echo_object_conf {
  79         struct cl_object_conf  eoc_cl;
  80         struct lov_stripe_md **eoc_md;
  81 };
  82
  83 struct echo_page {
  84         struct cl_page_slice   ep_cl;
  85         cfs_page_t            *ep_vmpage;
  86 };
  87
  88 struct echo_lock {
  89         struct cl_lock_slice   el_cl;
  90         cfs_list_t             el_chain;
  91         struct echo_object    *el_object;
  92         __u64                  el_cookie;
  93         cfs_atomic_t           el_refcount;
  94 };
  95
  96 struct echo_io {
  97         struct cl_io_slice     ei_cl;
  98 };
  99
 100 #if 0
 101 struct echo_req {
 102         struct cl_req_slice er_cl;
 103 };
 104 #endif
 105
 106 static int echo_client_setup(struct obd_device *obddev,
 107                              struct lustre_cfg *lcfg);
 108 static int echo_client_cleanup(struct obd_device *obddev);
 109
 110
 111 /** \defgroup echo_helpers Helper functions
 112  * @{
 113  */
 114 static inline struct echo_device *cl2echo_dev(const struct cl_device *dev)
 115 {
 116         return container_of0(dev, struct echo_device, ed_cl);
 117 }
 118
 119 static inline struct cl_device *echo_dev2cl(struct echo_device *d)
 120 {
 121         return &d->ed_cl;
 122 }
 123
 124 static inline struct echo_device *obd2echo_dev(const struct obd_device *obd)
 125 {
 126         return cl2echo_dev(lu2cl_dev(obd->obd_lu_dev));
 127 }
 128
 129 static inline struct cl_object *echo_obj2cl(struct echo_object *eco)
 130 {
 131         return &eco->eo_cl;
 132 }
 133
 134 static inline struct echo_object *cl2echo_obj(const struct cl_object *o)
 135 {
 136         return container_of(o, struct echo_object, eo_cl);
 137 }
 138
 139 static inline struct echo_page *cl2echo_page(const struct cl_page_slice *s)
 140 {
 141         return container_of(s, struct echo_page, ep_cl);
 142 }
 143
 144 static inline struct echo_lock *cl2echo_lock(const struct cl_lock_slice *s)
 145 {
 146         return container_of(s, struct echo_lock, el_cl);
 147 }
 148
 149 static inline struct cl_lock *echo_lock2cl(const struct echo_lock *ecl)
 150 {
 151         return ecl->el_cl.cls_lock;
 152 }
 153
 154 static struct lu_context_key echo_thread_key;
 155 static inline struct echo_thread_info *echo_env_info(const struct lu_env *env)
 156 {
 157         struct echo_thread_info *info;
 158         info = lu_context_key_get(&env->le_ctx, &echo_thread_key);
 159         LASSERT(info != NULL);
 160         return info;
 161 }
 162
 163 static inline
 164 struct echo_object_conf *cl2echo_conf(const struct cl_object_conf *c)
 165 {
 166         return container_of(c, struct echo_object_conf, eoc_cl);
 167 }
 168
 169 static inline void lsm2fid(struct lov_stripe_md *lsm, struct lu_fid *fid)
 170 {
 171         fid_zero(fid);
 172         fid->f_seq = FID_SEQ_ECHO;
 173         /* truncated to 32 bits by assignment */
 174         fid->f_oid = lsm->lsm_object_id;
 175         fid->f_ver = lsm->lsm_object_id >> 32;
 176 }
 177 /** @} echo_helpers */
 178
 179 static struct echo_object *cl_echo_object_find(struct echo_device *d,
 180                                                struct lov_stripe_md **lsm);
 181 static int cl_echo_object_put(struct echo_object *eco);
 182 static int cl_echo_enqueue   (struct echo_object *eco, obd_off start,
 183                               obd_off end, int mode, __u64 *cookie);
 184 static int cl_echo_cancel    (struct echo_device *d, __u64 cookie);
 185 static int cl_echo_object_brw(struct echo_object *eco, int rw, obd_off offset,
 186                               cfs_page_t **pages, int npages, int async);
 187
 188 static struct echo_thread_info *echo_env_info(const struct lu_env *env);
 189
 190 struct echo_thread_info {
 191         struct echo_object_conf eti_conf;
 192         struct lustre_md        eti_md;
 193
 194         struct cl_2queue        eti_queue;
 195         struct cl_io            eti_io;
 196         struct cl_lock_descr    eti_descr;
 197         struct lu_fid           eti_fid;
 198 };
 199
 200 /* No session used right now */
 201 struct echo_session_info {
 202         unsigned long dummy;
 203 };
 204
 205 static cfs_mem_cache_t *echo_page_kmem;
 206 static cfs_mem_cache_t *echo_lock_kmem;
 207 static cfs_mem_cache_t *echo_object_kmem;
 208 static cfs_mem_cache_t *echo_thread_kmem;
 209 static cfs_mem_cache_t *echo_session_kmem;
 210 //static cfs_mem_cache_t *echo_req_kmem;
 211
 212 static struct lu_kmem_descr echo_caches[] = {
 213         {
 214                 .ckd_cache = &echo_page_kmem,
 215                 .ckd_name  = "echo_page_kmem",
 216                 .ckd_size  = sizeof (struct echo_page)
 217         },
 218         {
 219                 .ckd_cache = &echo_lock_kmem,
 220                 .ckd_name  = "echo_lock_kmem",
 221                 .ckd_size  = sizeof (struct echo_lock)
 222         },
 223         {
 224                 .ckd_cache = &echo_object_kmem,
 225                 .ckd_name  = "echo_object_kmem",
 226                 .ckd_size  = sizeof (struct echo_object)
 227         },
 228         {
 229                 .ckd_cache = &echo_thread_kmem,
 230                 .ckd_name  = "echo_thread_kmem",
 231                 .ckd_size  = sizeof (struct echo_thread_info)
 232         },
 233         {
 234                 .ckd_cache = &echo_session_kmem,
 235                 .ckd_name  = "echo_session_kmem",
 236                 .ckd_size  = sizeof (struct echo_session_info)
 237         },
 238 #if 0
 239         {
 240                 .ckd_cache = &echo_req_kmem,
 241                 .ckd_name  = "echo_req_kmem",
 242                 .ckd_size  = sizeof (struct echo_req)
 243         },
 244 #endif
 245         {
 246                 .ckd_cache = NULL
 247         }
 248 };
 249
 250 /** \defgroup echo_page Page operations
 251  *
 252  * Echo page operations.
 253  *
 254  * @{
 255  */
 256 cfs_page_t *echo_page_vmpage(const struct lu_env *env,
 257                              const struct cl_page_slice *slice)
 258 {
 259         return cl2echo_page(slice)->ep_vmpage;
 260 }
 261
 262 static void echo_page_discard(const struct lu_env *env,
 263                               const struct cl_page_slice *slice,
 264                               struct cl_io *unused)
 265 {
 266         cl_page_delete(env, slice->cpl_page);
 267 }
 268
 269 static int echo_page_is_vmlocked(const struct lu_env *env,
 270                                  const struct cl_page_slice *slice)
 271 {
 272         return 1;
 273 }
 274
 275 static void echo_page_completion(const struct lu_env *env,
 276                                  const struct cl_page_slice *slice,
 277                                  int ioret)
 278 {
 279         LASSERT(slice->cpl_page->cp_sync_io != NULL);
 280 }
 281
 282 static void echo_page_fini(const struct lu_env *env,
 283                            struct cl_page_slice *slice)
 284 {
 285         struct echo_page *ep    = cl2echo_page(slice);
 286         struct echo_object *eco = cl2echo_obj(slice->cpl_obj);
 287         cfs_page_t *vmpage      = ep->ep_vmpage;
 288         ENTRY;
 289
 290         cfs_atomic_dec(&eco->eo_npages);
 291         page_cache_release(vmpage);
 292         OBD_SLAB_FREE_PTR(ep, echo_page_kmem);
 293         EXIT;
 294 }
 295
 296 static int echo_page_prep(const struct lu_env *env,
 297                           const struct cl_page_slice *slice,
 298                           struct cl_io *unused)
 299 {
 300         return 0;
 301 }
 302
 303 static int echo_page_print(const struct lu_env *env,
 304                            const struct cl_page_slice *slice,
 305                            void *cookie, lu_printer_t printer)
 306 {
 307         struct echo_page *ep = cl2echo_page(slice);
 308
 309         (*printer)(env, cookie, LUSTRE_ECHO_CLIENT_NAME"-page@%p vm@%p\n",
 310                    ep, ep->ep_vmpage);
 311         return 0;
 312 }
 313
 314 static const struct cl_page_operations echo_page_ops = {
 315         .cpo_discard       = echo_page_discard,
 316         .cpo_vmpage        = echo_page_vmpage,
 317         .cpo_fini          = echo_page_fini,
 318         .cpo_print         = echo_page_print,
 319         .cpo_is_vmlocked   = echo_page_is_vmlocked,
 320         .io = {
 321                 [CRT_READ] = {
 322                         .cpo_prep        = echo_page_prep,
 323                         .cpo_completion  = echo_page_completion,
 324                 },
 325                 [CRT_WRITE] = {
 326                         .cpo_prep        = echo_page_prep,
 327                         .cpo_completion  = echo_page_completion,
 328                 }
 329         }
 330 };
 331 /** @} echo_page */
 332
 333 /** \defgroup echo_lock Locking
 334  *
 335  * echo lock operations
 336  *
 337  * @{
 338  */
 339 static void echo_lock_fini(const struct lu_env *env,
 340                            struct cl_lock_slice *slice)
 341 {
 342         struct echo_lock *ecl = cl2echo_lock(slice);
 343
 344         LASSERT(cfs_list_empty(&ecl->el_chain));
 345         OBD_SLAB_FREE_PTR(ecl, echo_lock_kmem);
 346 }
 347
 348 static void echo_lock_delete(const struct lu_env *env,
 349                              const struct cl_lock_slice *slice)
 350 {
 351         struct echo_lock *ecl      = cl2echo_lock(slice);
 352
 353         LASSERT(cfs_list_empty(&ecl->el_chain));
 354 }
 355
 356 static int echo_lock_fits_into(const struct lu_env *env,
 357                                const struct cl_lock_slice *slice,
 358                                const struct cl_lock_descr *need,
 359                                const struct cl_io *unused)
 360 {
 361         return 1;
 362 }
 363
 364 static struct cl_lock_operations echo_lock_ops = {
 365         .clo_fini      = echo_lock_fini,
 366         .clo_delete    = echo_lock_delete,
 367         .clo_fits_into = echo_lock_fits_into
 368 };
 369
 370 /** @} echo_lock */
 371
 372 /** \defgroup echo_cl_ops cl_object operations
 373  *
 374  * operations for cl_object
 375  *
 376  * @{
 377  */
 378 static struct cl_page *echo_page_init(const struct lu_env *env,
 379                                       struct cl_object *obj,
 380                                       struct cl_page *page, cfs_page_t *vmpage)
 381 {
 382         struct echo_page *ep;
 383         ENTRY;
 384
 385         OBD_SLAB_ALLOC_PTR_GFP(ep, echo_page_kmem, CFS_ALLOC_IO);
 386         if (ep != NULL) {
 387                 struct echo_object *eco = cl2echo_obj(obj);
 388                 ep->ep_vmpage = vmpage;
 389                 page_cache_get(vmpage);
 390                 cl_page_slice_add(page, &ep->ep_cl, obj, &echo_page_ops);
 391                 cfs_atomic_inc(&eco->eo_npages);
 392         }
 393         RETURN(ERR_PTR(ep ? 0 : -ENOMEM));
 394 }
 395
 396 static int echo_io_init(const struct lu_env *env, struct cl_object *obj,
 397                         struct cl_io *io)
 398 {
 399         return 0;
 400 }
 401
 402 static int echo_lock_init(const struct lu_env *env,
 403                           struct cl_object *obj, struct cl_lock *lock,
 404                           const struct cl_io *unused)
 405 {
 406         struct echo_lock *el;
 407         ENTRY;
 408
 409         OBD_SLAB_ALLOC_PTR_GFP(el, echo_lock_kmem, CFS_ALLOC_IO);
 410         if (el != NULL) {
 411                 cl_lock_slice_add(lock, &el->el_cl, obj, &echo_lock_ops);
 412                 el->el_object = cl2echo_obj(obj);
 413                 CFS_INIT_LIST_HEAD(&el->el_chain);
 414                 cfs_atomic_set(&el->el_refcount, 0);
 415         }
 416         RETURN(el == NULL ? -ENOMEM : 0);
 417 }
 418
 419 static int echo_conf_set(const struct lu_env *env, struct cl_object *obj,
 420                          const struct cl_object_conf *conf)
 421 {
 422         return 0;
 423 }
 424
 425 static const struct cl_object_operations echo_cl_obj_ops = {
 426         .coo_page_init = echo_page_init,
 427         .coo_lock_init = echo_lock_init,
 428         .coo_io_init   = echo_io_init,
 429         .coo_conf_set  = echo_conf_set
 430 };
 431 /** @} echo_cl_ops */
 432
 433 /** \defgroup echo_lu_ops lu_object operations
 434  *
 435  * operations for echo lu object.
 436  *
 437  * @{
 438  */
 439 static int echo_object_init(const struct lu_env *env, struct lu_object *obj,
 440                             const struct lu_object_conf *conf)
 441 {
 442         const struct cl_object_conf *cconf = lu2cl_conf(conf);
 443         struct echo_object_conf *econf = cl2echo_conf(cconf);
 444         struct echo_device *ed         = cl2echo_dev(lu2cl_dev(obj->lo_dev));
 445         struct echo_client_obd *ec     = ed->ed_ec;
 446         struct echo_object *eco        = cl2echo_obj(lu2cl(obj));
 447         ENTRY;
 448
 449         if (ed->ed_next) {
 450                 struct lu_object  *below;
 451                 struct lu_device  *under;
 452
 453                 under = ed->ed_next;
 454                 below = under->ld_ops->ldo_object_alloc(env, obj->lo_header,
 455                                                         under);
 456                 if (below == NULL)
 457                         RETURN(-ENOMEM);
 458                 lu_object_add(obj, below);
 459         }
 460
 461         LASSERT(econf->eoc_md);
 462         eco->eo_lsm = *econf->eoc_md;
 463         eco->eo_dev = ed;
 464         cfs_atomic_set(&eco->eo_npages, 0);
 465
 466         /* clear the lsm pointer so that it won't get freed. */
 467         *econf->eoc_md = NULL;
 468
 469         cfs_spin_lock(&ec->ec_lock);
 470         cfs_list_add_tail(&eco->eo_obj_chain, &ec->ec_objects);
 471         cfs_spin_unlock(&ec->ec_lock);
 472
 473         RETURN(0);
 474 }
 475
 476 static void echo_object_free(const struct lu_env *env, struct lu_object *obj)
 477 {
 478         struct echo_object *eco    = cl2echo_obj(lu2cl(obj));
 479         struct echo_client_obd *ec = eco->eo_dev->ed_ec;
 480         struct lov_stripe_md *lsm  = eco->eo_lsm;
 481         ENTRY;
 482
 483         LASSERT(cfs_atomic_read(&eco->eo_npages) == 0);
 484
 485         cfs_spin_lock(&ec->ec_lock);
 486         cfs_list_del_init(&eco->eo_obj_chain);
 487         cfs_spin_unlock(&ec->ec_lock);
 488
 489         lu_object_fini(obj);
 490         lu_object_header_fini(obj->lo_header);
 491
 492         if (lsm)
 493                 obd_free_memmd(ec->ec_exp, &lsm);
 494         OBD_SLAB_FREE_PTR(eco, echo_object_kmem);
 495         EXIT;
 496 }
 497
 498 static int echo_object_print(const struct lu_env *env, void *cookie,
 499                             lu_printer_t p, const struct lu_object *o)
 500 {
 501         struct echo_object *obj = cl2echo_obj(lu2cl(o));
 502
 503         return (*p)(env, cookie, "echoclient-object@%p", obj);
 504 }
 505
 506
 507 static const struct lu_object_operations echo_lu_obj_ops = {
 508         .loo_object_init      = echo_object_init,
 509         .loo_object_delete    = NULL,
 510         .loo_object_release   = NULL,
 511         .loo_object_free      = echo_object_free,
 512         .loo_object_print     = echo_object_print,
 513         .loo_object_invariant = NULL
 514 };
 515 /** @} echo_lu_ops */
 516
 517 /** \defgroup echo_lu_dev_ops  lu_device operations
 518  *
 519  * Operations for echo lu device.
 520  *
 521  * @{
 522  */
 523 static struct lu_object *echo_object_alloc(const struct lu_env *env,
 524                                            const struct lu_object_header *hdr,
 525                                            struct lu_device *dev)
 526 {
 527         struct echo_object *eco;
 528         struct lu_object *obj = NULL;
 529         ENTRY;
 530
 531         /* we're the top dev. */
 532         LASSERT(hdr == NULL);
 533         OBD_SLAB_ALLOC_PTR_GFP(eco, echo_object_kmem, CFS_ALLOC_IO);
 534         if (eco != NULL) {
 535                 struct cl_object_header *hdr = &eco->eo_hdr;
 536
 537                 obj = &echo_obj2cl(eco)->co_lu;
 538                 cl_object_header_init(hdr);
 539                 lu_object_init(obj, &hdr->coh_lu, dev);
 540                 lu_object_add_top(&hdr->coh_lu, obj);
 541
 542                 eco->eo_cl.co_ops = &echo_cl_obj_ops;
 543                 obj->lo_ops       = &echo_lu_obj_ops;
 544         }
 545         RETURN(obj);
 546 }
 547
 548 static struct lu_device_operations echo_device_lu_ops = {
 549         .ldo_object_alloc   = echo_object_alloc,
 550 };
 551 /** @} echo_lu_dev_ops */
 552
 553 static struct cl_device_operations echo_device_cl_ops = {
 554 };
 555
 556 /** \defgroup echo_init Setup and teardown
 557  *
 558  * Init and fini functions for echo client.
 559  *
 560  * @{
 561  */
 562 static int echo_site_init(const struct lu_env *env, struct echo_device *ed)
 563 {
 564         struct cl_site *site = &ed->ed_site_myself;
 565         int rc;
 566
 567         /* initialize site */
 568         rc = cl_site_init(site, &ed->ed_cl);
 569         if (rc) {
 570                 CERROR("Cannot initilize site for echo client(%d)\n", rc);
 571                 return rc;
 572         }
 573
 574         rc = lu_site_init_finish(&site->cs_lu);
 575         if (rc)
 576                 return rc;
 577
 578         ed->ed_site = site;
 579         return 0;
 580 }
 581
 582 static void echo_site_fini(const struct lu_env *env, struct echo_device *ed)
 583 {
 584         if (ed->ed_site) {
 585                 cl_site_fini(ed->ed_site);
 586                 ed->ed_site = NULL;
 587         }
 588 }
 589
 590 static void *echo_thread_key_init(const struct lu_context *ctx,
 591                           struct lu_context_key *key)
 592 {
 593         struct echo_thread_info *info;
 594
 595         OBD_SLAB_ALLOC_PTR_GFP(info, echo_thread_kmem, CFS_ALLOC_IO);
 596         if (info == NULL)
 597                 info = ERR_PTR(-ENOMEM);
 598         return info;
 599 }
 600
 601 static void echo_thread_key_fini(const struct lu_context *ctx,
 602                          struct lu_context_key *key, void *data)
 603 {
 604         struct echo_thread_info *info = data;
 605         OBD_SLAB_FREE_PTR(info, echo_thread_kmem);
 606 }
 607
 608 static void echo_thread_key_exit(const struct lu_context *ctx,
 609                          struct lu_context_key *key, void *data)
 610 {
 611 }
 612
 613 static struct lu_context_key echo_thread_key = {
 614         .lct_tags = LCT_CL_THREAD,
 615         .lct_init = echo_thread_key_init,
 616         .lct_fini = echo_thread_key_fini,
 617         .lct_exit = echo_thread_key_exit
 618 };
 619
 620 static void *echo_session_key_init(const struct lu_context *ctx,
 621                                   struct lu_context_key *key)
 622 {
 623         struct echo_session_info *session;
 624
 625         OBD_SLAB_ALLOC_PTR_GFP(session, echo_session_kmem, CFS_ALLOC_IO);
 626         if (session == NULL)
 627                 session = ERR_PTR(-ENOMEM);
 628         return session;
 629 }
 630
 631 static void echo_session_key_fini(const struct lu_context *ctx,
 632                                  struct lu_context_key *key, void *data)
 633 {
 634         struct echo_session_info *session = data;
 635         OBD_SLAB_FREE_PTR(session, echo_session_kmem);
 636 }
 637
 638 static void echo_session_key_exit(const struct lu_context *ctx,
 639                                  struct lu_context_key *key, void *data)
 640 {
 641 }
 642
 643 static struct lu_context_key echo_session_key = {
 644         .lct_tags = LCT_SESSION,
 645         .lct_init = echo_session_key_init,
 646         .lct_fini = echo_session_key_fini,
 647         .lct_exit = echo_session_key_exit
 648 };
 649
 650 LU_TYPE_INIT_FINI(echo, &echo_thread_key, &echo_session_key);
 651
 652 static struct lu_device *echo_device_alloc(const struct lu_env *env,
 653                                            struct lu_device_type *t,
 654                                            struct lustre_cfg *cfg)
 655 {
 656         struct lu_device   *next;
 657         struct echo_device *ed;
 658         struct cl_device   *cd;
 659         struct obd_device  *obd = NULL; /* to keep compiler happy */
 660         struct obd_device  *tgt;
 661         const char *tgt_type_name;
 662         int rc;
 663         int cleanup = 0;
 664         ENTRY;
 665
 666         OBD_ALLOC_PTR(ed);
 667         if (ed == NULL)
 668                 GOTO(out, rc = -ENOMEM);
 669
 670         cleanup = 1;
 671         cd = &ed->ed_cl;
 672         rc = cl_device_init(cd, t);
 673         if (rc)
 674                 GOTO(out, rc);
 675
 676         cd->cd_lu_dev.ld_ops = &echo_device_lu_ops;
 677         cd->cd_ops = &echo_device_cl_ops;
 678
 679         cleanup = 2;
 680         rc = echo_site_init(env, ed);
 681         if (rc)
 682                 GOTO(out, rc);
 683
 684         cleanup = 3;
 685         obd = class_name2obd(lustre_cfg_string(cfg, 0));
 686         LASSERT(obd != NULL);
 687         rc = echo_client_setup(obd, cfg);
 688         if (rc)
 689                 GOTO(out, rc);
 690         ed->ed_ec = &obd->u.echo_client;
 691
 692         cleanup = 4;
 693         tgt = class_name2obd(lustre_cfg_string(cfg, 1));
 694         LASSERT(tgt != NULL);
 695         next = tgt->obd_lu_dev;
 696         if (next != NULL && !lu_device_is_cl(next))
 697                 next = NULL;
 698
 699         /*
 700          * if echo client is to be stacked upon ost device, the next is NULL
 701          * since ost is not a clio device so far
 702          */
 703         tgt_type_name = tgt->obd_type->typ_name;
 704         if (next != NULL) {
 705                 LASSERT(next != NULL);
 706                 if (next->ld_site != NULL)
 707                         GOTO(out, rc = -EBUSY);
 708
 709                 next->ld_site = &ed->ed_site->cs_lu;
 710                 rc = next->ld_type->ldt_ops->ldto_device_init(env, next,
 711                                              next->ld_type->ldt_name, NULL);
 712                 if (rc)
 713                         GOTO(out, rc);
 714
 715                 /* Trikcy case, I have to determine the obd type since clio
 716                  * uses the different parameters to initialize objects for
 717                  * lov & osc.
 718                  */
 719                 if (strcmp(tgt_type_name, LUSTRE_LOV_NAME) == 0)
 720                         ed->ed_next_islov = 1;
 721                 else
 722                         LASSERT(strcmp(tgt_type_name, LUSTRE_OSC_NAME) == 0);
 723         } else
 724                 LASSERT(strcmp(tgt_type_name, LUSTRE_OST_NAME) == 0);
 725
 726         ed->ed_next = next;
 727         RETURN(&cd->cd_lu_dev);
 728
 729 out:
 730         switch(cleanup) {
 731         case 4: {
 732                 int rc2;
 733                 rc2 = echo_client_cleanup(obd);
 734                 if (rc2)
 735                         CERROR("Cleanup obd device %s error(%d)\n",
 736                                obd->obd_name, rc2);
 737         }
 738
 739         case 3:
 740                 echo_site_fini(env, ed);
 741         case 2:
 742                 cl_device_fini(&ed->ed_cl);
 743         case 1:
 744                 OBD_FREE_PTR(ed);
 745         case 0:
 746         default:
 747                 break;
 748         }
 749         return(ERR_PTR(rc));
 750 }
 751
 752 static int echo_device_init(const struct lu_env *env, struct lu_device *d,
 753                           const char *name, struct lu_device *next)
 754 {
 755         LBUG();
 756         return 0;
 757 }
 758
 759 static struct lu_device *echo_device_fini(const struct lu_env *env,
 760                                           struct lu_device *d)
 761 {
 762         struct echo_device *ed = cl2echo_dev(lu2cl_dev(d));
 763         struct lu_device *next = ed->ed_next;
 764
 765         while (next)
 766                 next = next->ld_type->ldt_ops->ldto_device_fini(env, next);
 767         return NULL;
 768 }
 769
 770 static void echo_lock_release(const struct lu_env *env,
 771                               struct echo_lock *ecl,
 772                               int still_used)
 773 {
 774         struct cl_lock *clk = echo_lock2cl(ecl);
 775
 776         cl_lock_get(clk);
 777         cl_unuse(env, clk);
 778         cl_lock_release(env, clk, "ec enqueue", ecl->el_object);
 779         if (!still_used) {
 780                 cl_lock_mutex_get(env, clk);
 781                 cl_lock_cancel(env, clk);
 782                 cl_lock_delete(env, clk);
 783                 cl_lock_mutex_put(env, clk);
 784         }
 785         cl_lock_put(env, clk);
 786 }
 787
 788 static struct lu_device *echo_device_free(const struct lu_env *env,
 789                                           struct lu_device *d)
 790 {
 791         struct echo_device     *ed   = cl2echo_dev(lu2cl_dev(d));
 792         struct echo_client_obd *ec   = ed->ed_ec;
 793         struct echo_object     *eco;
 794         struct lu_device       *next = ed->ed_next;
 795
 796         CDEBUG(D_INFO, "echo device:%p is going to be freed, next = %p\n", ed, next);
 797
 798         /* destroy locks */
 799         cfs_spin_lock(&ec->ec_lock);
 800         while (!cfs_list_empty(&ec->ec_locks)) {
 801                 struct echo_lock *ecl = cfs_list_entry(ec->ec_locks.next,
 802                                                        struct echo_lock,
 803                                                        el_chain);
 804                 int still_used = 0;
 805
 806                 if (cfs_atomic_dec_and_test(&ecl->el_refcount))
 807                         cfs_list_del_init(&ecl->el_chain);
 808                 else
 809                         still_used = 1;
 810                 cfs_spin_unlock(&ec->ec_lock);
 811
 812                 CERROR("echo client: pending lock %p refs %d\n",
 813                        ecl, cfs_atomic_read(&ecl->el_refcount));
 814
 815                 echo_lock_release(env, ecl, still_used);
 816                 cfs_spin_lock(&ec->ec_lock);
 817         }
 818         cfs_spin_unlock(&ec->ec_lock);
 819
 820         LASSERT(ed->ed_site);
 821         lu_site_purge(env, &ed->ed_site->cs_lu, -1);
 822
 823         /* check if there are objects still alive.
 824          * It shouldn't have any object because lu_site_purge would cleanup
 825          * all of cached objects. Anyway, probably the echo device is being
 826          * parallelly accessed.
 827          */
 828         cfs_spin_lock(&ec->ec_lock);
 829         cfs_list_for_each_entry(eco, &ec->ec_objects, eo_obj_chain)
 830                 eco->eo_deleted = 1;
 831         cfs_spin_unlock(&ec->ec_lock);
 832
 833         /* purge again */
 834         lu_site_purge(env, &ed->ed_site->cs_lu, -1);
 835
 836         CDEBUG(D_INFO,
 837                "Waiting for the reference of echo object to be dropped\n");
 838
 839         /* Wait for the last reference to be dropped. */
 840         cfs_spin_lock(&ec->ec_lock);
 841         while (!cfs_list_empty(&ec->ec_objects)) {
 842                 cfs_spin_unlock(&ec->ec_lock);
 843                 CERROR("echo_client still has objects at cleanup time, "
 844                        "wait for 1 second\n");
 845                 cfs_schedule_timeout_and_set_state(CFS_TASK_UNINT,
 846                                                    cfs_time_seconds(1));
 847                 cfs_spin_lock(&ec->ec_lock);
 848         }
 849         cfs_spin_unlock(&ec->ec_lock);
 850
 851         CDEBUG(D_INFO, "No object exists, exiting...\n");
 852
 853         echo_client_cleanup(d->ld_obd);
 854
 855         while (next)
 856                 next = next->ld_type->ldt_ops->ldto_device_free(env, next);
 857
 858         LASSERT(ed->ed_site == lu2cl_site(d->ld_site));
 859         echo_site_fini(env, ed);
 860         cl_device_fini(&ed->ed_cl);
 861         OBD_FREE_PTR(ed);
 862
 863         return NULL;
 864 }
 865
 866 static const struct lu_device_type_operations echo_device_type_ops = {
 867         .ldto_init = echo_type_init,
 868         .ldto_fini = echo_type_fini,
 869
 870         .ldto_start = echo_type_start,
 871         .ldto_stop  = echo_type_stop,
 872
 873         .ldto_device_alloc = echo_device_alloc,
 874         .ldto_device_free  = echo_device_free,
 875         .ldto_device_init  = echo_device_init,
 876         .ldto_device_fini  = echo_device_fini
 877 };
 878
 879 static struct lu_device_type echo_device_type = {
 880         .ldt_tags     = LU_DEVICE_CL,
 881         .ldt_name     = LUSTRE_ECHO_CLIENT_NAME,
 882         .ldt_ops      = &echo_device_type_ops,
 883         .ldt_ctx_tags = LCT_CL_THREAD
 884 };
 885 /** @} echo_init */
 886
 887 /** \defgroup echo_exports Exported operations
 888  *
 889  * exporting functions to echo client
 890  *
 891  * @{
 892  */
 893
 894 /* Interfaces to echo client obd device */
 895 static struct echo_object *cl_echo_object_find(struct echo_device *d,
 896                                                struct lov_stripe_md **lsmp)
 897 {
 898         struct lu_env *env;
 899         struct echo_thread_info *info;
 900         struct echo_object_conf *conf;
 901         struct lov_stripe_md    *lsm;
 902         struct echo_object *eco;
 903         struct cl_object   *obj;
 904         struct lu_fid *fid;
 905         int refcheck;
 906         ENTRY;
 907
 908         LASSERT(lsmp);
 909         lsm = *lsmp;
 910         LASSERT(lsm);
 911         LASSERT(lsm->lsm_object_id);
 912
 913         /* Never return an object if the obd is to be freed. */
 914         if (echo_dev2cl(d)->cd_lu_dev.ld_obd->obd_stopping)
 915                 RETURN(ERR_PTR(-ENODEV));
 916
 917         env = cl_env_get(&refcheck);
 918         if (IS_ERR(env))
 919                 RETURN((void *)env);
 920
 921         info = echo_env_info(env);
 922         conf = &info->eti_conf;
 923         if (d->ed_next) {
 924                 if (!d->ed_next_islov) {
 925                         struct lov_oinfo *oinfo = lsm->lsm_oinfo[0];
 926                         LASSERT(oinfo != NULL);
 927                         oinfo->loi_id = lsm->lsm_object_id;
 928                         oinfo->loi_seq = lsm->lsm_object_seq;
 929                         conf->eoc_cl.u.coc_oinfo = oinfo;
 930                 } else {
 931                         struct lustre_md *md;
 932                         md = &info->eti_md;
 933                         memset(md, 0, sizeof *md);
 934                         md->lsm = lsm;
 935                         conf->eoc_cl.u.coc_md = md;
 936                 }
 937         }
 938         conf->eoc_md = lsmp;
 939
 940         fid  = &info->eti_fid;
 941         lsm2fid(lsm, fid);
 942
 943         obj = cl_object_find(env, echo_dev2cl(d), fid, &conf->eoc_cl);
 944         if (IS_ERR(obj))
 945                 GOTO(out, eco = (void*)obj);
 946
 947         eco = cl2echo_obj(obj);
 948         if (eco->eo_deleted) {
 949                 cl_object_put(env, obj);
 950                 eco = ERR_PTR(-EAGAIN);
 951         }
 952
 953 out:
 954         cl_env_put(env, &refcheck);
 955         RETURN(eco);
 956 }
 957
 958 static int cl_echo_object_put(struct echo_object *eco)
 959 {
 960         struct lu_env *env;
 961         struct cl_object *obj = echo_obj2cl(eco);
 962         int refcheck;
 963         ENTRY;
 964
 965         env = cl_env_get(&refcheck);
 966         if (IS_ERR(env))
 967                 RETURN(PTR_ERR(env));
 968
 969         /* an external function to kill an object? */
 970         if (eco->eo_deleted) {
 971                 struct lu_object_header *loh = obj->co_lu.lo_header;
 972                 LASSERT(&eco->eo_hdr == luh2coh(loh));
 973                 cfs_set_bit(LU_OBJECT_HEARD_BANSHEE, &loh->loh_flags);
 974                 cl_object_prune(env, obj);
 975         }
 976
 977         cl_object_put(env, obj);
 978         cl_env_put(env, &refcheck);
 979         RETURN(0);
 980 }
 981
 982 static int cl_echo_enqueue0(struct lu_env *env, struct echo_object *eco,
 983                             obd_off start, obd_off end, int mode,
 984                             __u64 *cookie , __u32 enqflags)
 985 {
 986         struct cl_io *io;
 987         struct cl_lock *lck;
 988         struct cl_object *obj;
 989         struct cl_lock_descr *descr;
 990         struct echo_thread_info *info;
 991         int rc = -ENOMEM;
 992         ENTRY;
 993
 994         info = echo_env_info(env);
 995         io = &info->eti_io;
 996         descr = &info->eti_descr;
 997         obj = echo_obj2cl(eco);
 998
 999         descr->cld_obj   = obj;
1000         descr->cld_start = cl_index(obj, start);
1001         descr->cld_end   = cl_index(obj, end);
1002         descr->cld_mode  = mode == LCK_PW ? CLM_WRITE : CLM_READ;
1003         descr->cld_enq_flags = enqflags;
1004         io->ci_obj = obj;
1005
1006         lck = cl_lock_request(env, io, descr, "ec enqueue", eco);
1007         if (lck) {
1008                 struct echo_client_obd *ec = eco->eo_dev->ed_ec;
1009                 struct echo_lock *el;
1010
1011                 rc = cl_wait(env, lck);
1012                 if (rc == 0) {
1013                         el = cl2echo_lock(cl_lock_at(lck, &echo_device_type));
1014                         cfs_spin_lock(&ec->ec_lock);
1015                         if (cfs_list_empty(&el->el_chain)) {
1016                                 cfs_list_add(&el->el_chain, &ec->ec_locks);
1017                                 el->el_cookie = ++ec->ec_unique;
1018                         }
1019                         cfs_atomic_inc(&el->el_refcount);
1020                         *cookie = el->el_cookie;
1021                         cfs_spin_unlock(&ec->ec_lock);
1022                 } else
1023                         cl_lock_release(env, lck, "ec enqueue", cfs_current());
1024         }
1025         RETURN(rc);
1026 }
1027
1028 static int cl_echo_enqueue(struct echo_object *eco, obd_off start, obd_off end,
1029                            int mode, __u64 *cookie)
1030 {
1031         struct echo_thread_info *info;
1032         struct lu_env *env;
1033         struct cl_io *io;
1034         int refcheck;
1035         int result;
1036         ENTRY;
1037
1038         env = cl_env_get(&refcheck);
1039         if (IS_ERR(env))
1040                 RETURN(PTR_ERR(env));
1041
1042         info = echo_env_info(env);
1043         io = &info->eti_io;
1044
1045         result = cl_io_init(env, io, CIT_MISC, echo_obj2cl(eco));
1046         if (result < 0)
1047                 GOTO(out, result);
1048         LASSERT(result == 0);
1049
1050         result = cl_echo_enqueue0(env, eco, start, end, mode, cookie, 0);
1051         cl_io_fini(env, io);
1052
1053         EXIT;
1054 out:
1055         cl_env_put(env, &refcheck);
1056         return result;
1057 }
1058
1059 static int cl_echo_cancel0(struct lu_env *env, struct echo_device *ed,
1060                            __u64 cookie)
1061 {
1062         struct echo_client_obd *ec = ed->ed_ec;
1063         struct echo_lock       *ecl = NULL;
1064         cfs_list_t             *el;
1065         int found = 0, still_used = 0;
1066         ENTRY;
1067
1068         LASSERT(ec != NULL);
1069         cfs_spin_lock (&ec->ec_lock);
1070         cfs_list_for_each (el, &ec->ec_locks) {
1071                 ecl = cfs_list_entry (el, struct echo_lock, el_chain);
1072                 CDEBUG(D_INFO, "ecl: %p, cookie: "LPX64"\n", ecl, ecl->el_cookie);
1073                 found = (ecl->el_cookie == cookie);
1074                 if (found) {
1075                         if (cfs_atomic_dec_and_test(&ecl->el_refcount))
1076                                 cfs_list_del_init(&ecl->el_chain);
1077                         else
1078                                 still_used = 1;
1079                         break;
1080                 }
1081         }
1082         cfs_spin_unlock (&ec->ec_lock);
1083
1084         if (!found)
1085                 RETURN(-ENOENT);
1086
1087         echo_lock_release(env, ecl, still_used);
1088         RETURN(0);
1089 }
1090
1091 static int cl_echo_cancel(struct echo_device *ed, __u64 cookie)
1092 {
1093         struct lu_env *env;
1094         int refcheck;
1095         int rc;
1096         ENTRY;
1097
1098         env = cl_env_get(&refcheck);
1099         if (IS_ERR(env))
1100                 RETURN(PTR_ERR(env));
1101
1102         rc = cl_echo_cancel0(env, ed, cookie);
1103
1104         cl_env_put(env, &refcheck);
1105         RETURN(rc);
1106 }
1107
1108 static int cl_echo_async_brw(const struct lu_env *env, struct cl_io *io,
1109                              enum cl_req_type unused, struct cl_2queue *queue)
1110 {
1111         struct cl_page *clp;
1112         struct cl_page *temp;
1113         int result = 0;
1114         ENTRY;
1115
1116         cl_page_list_for_each_safe(clp, temp, &queue->c2_qin) {
1117                 int rc;
1118                 rc = cl_page_cache_add(env, io, clp, CRT_WRITE);
1119                 if (rc == 0)
1120                         continue;
1121                 result = result ?: rc;
1122         }
1123         RETURN(result);
1124 }
1125
1126 static int cl_echo_object_brw(struct echo_object *eco, int rw, obd_off offset,
1127                               cfs_page_t **pages, int npages, int async)
1128 {
1129         struct lu_env           *env;
1130         struct echo_thread_info *info;
1131         struct cl_object        *obj = echo_obj2cl(eco);
1132         struct echo_device      *ed  = eco->eo_dev;
1133         struct cl_2queue        *queue;
1134         struct cl_io            *io;
1135         struct cl_page          *clp;
1136         struct lustre_handle    lh = { 0 };
1137         int page_size = cl_page_size(obj);
1138         int refcheck;
1139         int rc;
1140         int i;
1141         ENTRY;
1142
1143         LASSERT((offset & ~CFS_PAGE_MASK) == 0);
1144         LASSERT(ed->ed_next != NULL);
1145         env = cl_env_get(&refcheck);
1146         if (IS_ERR(env))
1147                 RETURN(PTR_ERR(env));
1148
1149         info    = echo_env_info(env);
1150         io      = &info->eti_io;
1151         queue   = &info->eti_queue;
1152
1153         cl_2queue_init(queue);
1154         rc = cl_io_init(env, io, CIT_MISC, obj);
1155         if (rc < 0)
1156                 GOTO(out, rc);
1157         LASSERT(rc == 0);
1158
1159
1160         rc = cl_echo_enqueue0(env, eco, offset,
1161                               offset + npages * CFS_PAGE_SIZE - 1,
1162                               rw == READ ? LCK_PR : LCK_PW, &lh.cookie,
1163                               CEF_NEVER);
1164         if (rc < 0)
1165                 GOTO(error_lock, rc);
1166
1167         for (i = 0; i < npages; i++) {
1168                 LASSERT(pages[i]);
1169                 clp = cl_page_find(env, obj, cl_index(obj, offset),
1170                                    pages[i], CPT_TRANSIENT);
1171                 if (IS_ERR(clp)) {
1172                         rc = PTR_ERR(clp);
1173                         break;
1174                 }
1175                 LASSERT(clp->cp_type == CPT_TRANSIENT);
1176
1177                 rc = cl_page_own(env, io, clp);
1178                 if (rc) {
1179                         LASSERT(clp->cp_state == CPS_FREEING);
1180                         cl_page_put(env, clp);
1181                         break;
1182                 }
1183
1184                 cl_2queue_add(queue, clp);
1185
1186                 /* drop the reference count for cl_page_find, so that the page
1187                  * will be freed in cl_2queue_fini. */
1188                 cl_page_put(env, clp);
1189                 cl_page_clip(env, clp, 0, page_size);
1190
1191                 offset += page_size;
1192         }
1193
1194         if (rc == 0) {
1195                 enum cl_req_type typ = rw == READ ? CRT_READ : CRT_WRITE;
1196
1197                 async = async && (typ == CRT_WRITE);
1198                 if (async)
1199                         rc = cl_echo_async_brw(env, io, typ, queue);
1200                 else
1201                         rc = cl_io_submit_sync(env, io, typ, queue,
1202                                                CRP_NORMAL, 0);
1203                 CDEBUG(D_INFO, "echo_client %s write returns %d\n",
1204                        async ? "async" : "sync", rc);
1205         }
1206
1207         cl_echo_cancel0(env, ed, lh.cookie);
1208         EXIT;
1209 error_lock:
1210         cl_2queue_discard(env, io, queue);
1211         cl_2queue_disown(env, io, queue);
1212         cl_2queue_fini(env, queue);
1213         cl_io_fini(env, io);
1214 out:
1215         cl_env_put(env, &refcheck);
1216         return rc;
1217 }
1218 /** @} echo_exports */
1219
1220
1221 static obd_id last_object_id;
1222
1223 static int
1224 echo_copyout_lsm (struct lov_stripe_md *lsm, void *_ulsm, int ulsm_nob)
1225 {
1226         struct lov_stripe_md *ulsm = _ulsm;
1227         int nob, i;
1228
1229         nob = offsetof (struct lov_stripe_md, lsm_oinfo[lsm->lsm_stripe_count]);
1230         if (nob > ulsm_nob)
1231                 return (-EINVAL);
1232
1233         if (cfs_copy_to_user (ulsm, lsm, sizeof(ulsm)))
1234                 return (-EFAULT);
1235
1236         for (i = 0; i < lsm->lsm_stripe_count; i++) {
1237                 if (cfs_copy_to_user (ulsm->lsm_oinfo[i], lsm->lsm_oinfo[i],
1238                                       sizeof(lsm->lsm_oinfo[0])))
1239                         return (-EFAULT);
1240         }
1241         return 0;
1242 }
1243
1244 static int
1245 echo_copyin_lsm (struct echo_device *ed, struct lov_stripe_md *lsm,
1246                  void *ulsm, int ulsm_nob)
1247 {
1248         struct echo_client_obd *ec = ed->ed_ec;
1249         int                     i;
1250
1251         if (ulsm_nob < sizeof (*lsm))
1252                 return (-EINVAL);
1253
1254         if (cfs_copy_from_user (lsm, ulsm, sizeof (*lsm)))
1255                 return (-EFAULT);
1256
1257         if (lsm->lsm_stripe_count > ec->ec_nstripes ||
1258             lsm->lsm_magic != LOV_MAGIC ||
1259             (lsm->lsm_stripe_size & (~CFS_PAGE_MASK)) != 0 ||
1260             ((__u64)lsm->lsm_stripe_size * lsm->lsm_stripe_count > ~0UL))
1261                 return (-EINVAL);
1262
1263
1264         for (i = 0; i < lsm->lsm_stripe_count; i++) {
1265                 if (cfs_copy_from_user(lsm->lsm_oinfo[i],
1266                                        ((struct lov_stripe_md *)ulsm)-> \
1267                                        lsm_oinfo[i],
1268                                        sizeof(lsm->lsm_oinfo[0])))
1269                         return (-EFAULT);
1270         }
1271         return (0);
1272 }
1273
1274 static int echo_create_object(struct echo_device *ed, int on_target,
1275                               struct obdo *oa, void *ulsm, int ulsm_nob,
1276                               struct obd_trans_info *oti)
1277 {
1278         struct echo_object     *eco;
1279         struct echo_client_obd *ec = ed->ed_ec;
1280         struct lov_stripe_md   *lsm = NULL;
1281         int                     rc;
1282         int                     created = 0;
1283         ENTRY;
1284
1285         if ((oa->o_valid & OBD_MD_FLID) == 0 && /* no obj id */
1286             (on_target ||                       /* set_stripe */
1287              ec->ec_nstripes != 0)) {           /* LOV */
1288                 CERROR ("No valid oid\n");
1289                 RETURN(-EINVAL);
1290         }
1291
1292         rc = obd_alloc_memmd(ec->ec_exp, &lsm);
1293         if (rc < 0) {
1294                 CERROR("Cannot allocate md, rc = %d\n", rc);
1295                 GOTO(failed, rc);
1296         }
1297
1298         if (ulsm != NULL) {
1299                 int i, idx;
1300
1301                 rc = echo_copyin_lsm (ed, lsm, ulsm, ulsm_nob);
1302                 if (rc != 0)
1303                         GOTO(failed, rc);
1304
1305                 if (lsm->lsm_stripe_count == 0)
1306                         lsm->lsm_stripe_count = ec->ec_nstripes;
1307
1308                 if (lsm->lsm_stripe_size == 0)
1309                         lsm->lsm_stripe_size = CFS_PAGE_SIZE;
1310
1311                 idx = ll_rand();
1312
1313                 /* setup stripes: indices + default ids if required */
1314                 for (i = 0; i < lsm->lsm_stripe_count; i++) {
1315                         if (lsm->lsm_oinfo[i]->loi_id == 0)
1316                                 lsm->lsm_oinfo[i]->loi_id = lsm->lsm_object_id;
1317
1318                         lsm->lsm_oinfo[i]->loi_ost_idx =
1319                                 (idx + i) % ec->ec_nstripes;
1320                 }
1321         }
1322
1323         /* setup object ID here for !on_target and LOV hint */
1324         if (oa->o_valid & OBD_MD_FLID)
1325                 lsm->lsm_object_id = oa->o_id;
1326
1327         if (lsm->lsm_object_id == 0)
1328                 lsm->lsm_object_id = ++last_object_id;
1329
1330         rc = 0;
1331         if (on_target) {
1332                 /* Only echo objects are allowed to be created */
1333                 LASSERT((oa->o_valid & OBD_MD_FLGROUP) &&
1334                         (oa->o_seq == FID_SEQ_ECHO));
1335                 rc = obd_create(ec->ec_exp, oa, &lsm, oti);
1336                 if (rc != 0) {
1337                         CERROR("Cannot create objects, rc = %d\n", rc);
1338                         GOTO(failed, rc);
1339                 }
1340                 created = 1;
1341         }
1342
1343         /* See what object ID we were given */
1344         oa->o_id = lsm->lsm_object_id;
1345         oa->o_valid |= OBD_MD_FLID;
1346
1347         eco = cl_echo_object_find(ed, &lsm);
1348         if (IS_ERR(eco))
1349                 GOTO(failed, rc = PTR_ERR(eco));
1350         cl_echo_object_put(eco);
1351
1352         CDEBUG(D_INFO, "oa->o_id = %lx\n", (long)oa->o_id);
1353         EXIT;
1354
1355  failed:
1356         if (created && rc)
1357                 obd_destroy(ec->ec_exp, oa, lsm, oti, NULL, NULL);
1358         if (lsm)
1359                 obd_free_memmd(ec->ec_exp, &lsm);
1360         if (rc)
1361                 CERROR("create object failed with rc = %d\n", rc);
1362         return (rc);
1363 }
1364
1365 static int echo_get_object(struct echo_object **ecop, struct echo_device *ed,
1366                            struct obdo *oa)
1367 {
1368         struct echo_client_obd *ec  = ed->ed_ec;
1369         struct lov_stripe_md   *lsm = NULL;
1370         struct echo_object     *eco;
1371         int                     rc;
1372         ENTRY;
1373
1374         if ((oa->o_valid & OBD_MD_FLID) == 0 ||
1375             oa->o_id == 0)  /* disallow use of object id 0 */
1376         {
1377                 CERROR ("No valid oid\n");
1378                 RETURN(-EINVAL);
1379         }
1380
1381         rc = obd_alloc_memmd(ec->ec_exp, &lsm);
1382         if (rc < 0)
1383                 RETURN(rc);
1384
1385         lsm->lsm_object_id = oa->o_id;
1386         if (oa->o_valid & OBD_MD_FLGROUP)
1387                 lsm->lsm_object_seq = oa->o_seq;
1388         else
1389                 lsm->lsm_object_seq = FID_SEQ_ECHO;
1390
1391         rc = 0;
1392         eco = cl_echo_object_find(ed, &lsm);
1393         if (!IS_ERR(eco))
1394                 *ecop = eco;
1395         else
1396                 rc = PTR_ERR(eco);
1397         if (lsm)
1398                 obd_free_memmd(ec->ec_exp, &lsm);
1399         RETURN(rc);
1400 }
1401
1402 static void echo_put_object(struct echo_object *eco)
1403 {
1404         if (cl_echo_object_put(eco))
1405                 CERROR("echo client: drop an object failed");
1406 }
1407
1408 static void
1409 echo_get_stripe_off_id (struct lov_stripe_md *lsm, obd_off *offp, obd_id *idp)
1410 {
1411         unsigned long stripe_count;
1412         unsigned long stripe_size;
1413         unsigned long width;
1414         unsigned long woffset;
1415         int           stripe_index;
1416         obd_off       offset;
1417
1418         if (lsm->lsm_stripe_count <= 1)
1419                 return;
1420
1421         offset       = *offp;
1422         stripe_size  = lsm->lsm_stripe_size;
1423         stripe_count = lsm->lsm_stripe_count;
1424
1425         /* width = # bytes in all stripes */
1426         width = stripe_size * stripe_count;
1427
1428         /* woffset = offset within a width; offset = whole number of widths */
1429         woffset = do_div (offset, width);
1430
1431         stripe_index = woffset / stripe_size;
1432
1433         *idp = lsm->lsm_oinfo[stripe_index]->loi_id;
1434         *offp = offset * stripe_size + woffset % stripe_size;
1435 }
1436
1437 static void
1438 echo_client_page_debug_setup(struct lov_stripe_md *lsm,
1439                              cfs_page_t *page, int rw, obd_id id,
1440                              obd_off offset, obd_off count)
1441 {
1442         char    *addr;
1443         obd_off  stripe_off;
1444         obd_id   stripe_id;
1445         int      delta;
1446
1447         /* no partial pages on the client */
1448         LASSERT(count == CFS_PAGE_SIZE);
1449
1450         addr = cfs_kmap(page);
1451
1452         for (delta = 0; delta < CFS_PAGE_SIZE; delta += OBD_ECHO_BLOCK_SIZE) {
1453                 if (rw == OBD_BRW_WRITE) {
1454                         stripe_off = offset + delta;
1455                         stripe_id = id;
1456                         echo_get_stripe_off_id(lsm, &stripe_off, &stripe_id);
1457                 } else {
1458                         stripe_off = 0xdeadbeef00c0ffeeULL;
1459                         stripe_id = 0xdeadbeef00c0ffeeULL;
1460                 }
1461                 block_debug_setup(addr + delta, OBD_ECHO_BLOCK_SIZE,
1462                                   stripe_off, stripe_id);
1463         }
1464
1465         cfs_kunmap(page);
1466 }
1467
1468 static int echo_client_page_debug_check(struct lov_stripe_md *lsm,
1469                                         cfs_page_t *page, obd_id id,
1470                                         obd_off offset, obd_off count)
1471 {
1472         obd_off stripe_off;
1473         obd_id  stripe_id;
1474         char   *addr;
1475         int     delta;
1476         int     rc;
1477         int     rc2;
1478
1479         /* no partial pages on the client */
1480         LASSERT(count == CFS_PAGE_SIZE);
1481
1482         addr = cfs_kmap(page);
1483
1484         for (rc = delta = 0; delta < CFS_PAGE_SIZE; delta += OBD_ECHO_BLOCK_SIZE) {
1485                 stripe_off = offset + delta;
1486                 stripe_id = id;
1487                 echo_get_stripe_off_id (lsm, &stripe_off, &stripe_id);
1488
1489                 rc2 = block_debug_check("test_brw",
1490                                         addr + delta, OBD_ECHO_BLOCK_SIZE,
1491                                         stripe_off, stripe_id);
1492                 if (rc2 != 0) {
1493                         CERROR ("Error in echo object "LPX64"\n", id);
1494                         rc = rc2;
1495                 }
1496         }
1497
1498         cfs_kunmap(page);
1499         return rc;
1500 }
1501
1502 static int echo_client_kbrw(struct echo_device *ed, int rw, struct obdo *oa,
1503                             struct echo_object *eco, obd_off offset,
1504                             obd_size count, int async,
1505                             struct obd_trans_info *oti)
1506 {
1507         struct echo_client_obd *ec  = ed->ed_ec;
1508         struct lov_stripe_md   *lsm = eco->eo_lsm;
1509         obd_count               npages;
1510         struct brw_page        *pga;
1511         struct brw_page        *pgp;
1512         cfs_page_t            **pages;
1513         obd_off                 off;
1514         int                     i;
1515         int                     rc;
1516         int                     verify;
1517         int                     gfp_mask;
1518         ENTRY;
1519
1520         verify = ((oa->o_id) != ECHO_PERSISTENT_OBJID &&
1521                   (oa->o_valid & OBD_MD_FLFLAGS) != 0 &&
1522                   (oa->o_flags & OBD_FL_DEBUG_CHECK) != 0);
1523
1524         gfp_mask = ((oa->o_id & 2) == 0) ? CFS_ALLOC_STD : CFS_ALLOC_HIGHUSER;
1525
1526         LASSERT(rw == OBD_BRW_WRITE || rw == OBD_BRW_READ);
1527         LASSERT(lsm != NULL);
1528         LASSERT(lsm->lsm_object_id == oa->o_id);
1529
1530         if (count <= 0 ||
1531             (count & (~CFS_PAGE_MASK)) != 0)
1532                 RETURN(-EINVAL);
1533
1534         /* XXX think again with misaligned I/O */
1535         npages = count >> CFS_PAGE_SHIFT;
1536
1537         OBD_ALLOC(pga, npages * sizeof(*pga));
1538         if (pga == NULL)
1539                 RETURN(-ENOMEM);
1540
1541         OBD_ALLOC(pages, npages * sizeof(*pages));
1542         if (pages == NULL) {
1543                 OBD_FREE(pga, npages * sizeof(*pga));
1544                 RETURN(-ENOMEM);
1545         }
1546
1547         for (i = 0, pgp = pga, off = offset;
1548              i < npages;
1549              i++, pgp++, off += CFS_PAGE_SIZE) {
1550
1551                 LASSERT (pgp->pg == NULL);      /* for cleanup */
1552
1553                 rc = -ENOMEM;
1554                 OBD_PAGE_ALLOC(pgp->pg, gfp_mask);
1555                 if (pgp->pg == NULL)
1556                         goto out;
1557
1558                 pages[i] = pgp->pg;
1559                 pgp->count = CFS_PAGE_SIZE;
1560                 pgp->off = off;
1561                 pgp->flag = 0;
1562
1563                 if (verify)
1564                         echo_client_page_debug_setup(lsm, pgp->pg, rw,
1565                                                      oa->o_id, off, pgp->count);
1566         }
1567
1568         if (ed->ed_next == NULL) {
1569                 struct obd_info oinfo = { { { 0 } } };
1570                 oinfo.oi_oa = oa;
1571                 oinfo.oi_md = lsm;
1572                 rc = obd_brw(rw, ec->ec_exp, &oinfo, npages, pga, oti);
1573         } else
1574                 rc = cl_echo_object_brw(eco, rw, offset, pages, npages, async);
1575
1576  out:
1577         if (rc != 0 || rw != OBD_BRW_READ)
1578                 verify = 0;
1579
1580         for (i = 0, pgp = pga; i < npages; i++, pgp++) {
1581                 if (pgp->pg == NULL)
1582                         continue;
1583
1584                 if (verify) {
1585                         int vrc;
1586                         vrc = echo_client_page_debug_check(lsm, pgp->pg, oa->o_id,
1587                                                            pgp->off, pgp->count);
1588                         if (vrc != 0 && rc == 0)
1589                                 rc = vrc;
1590                 }
1591                 OBD_PAGE_FREE(pgp->pg);
1592         }
1593         OBD_FREE(pga, npages * sizeof(*pga));
1594         OBD_FREE(pages, npages * sizeof(*pages));
1595         RETURN(rc);
1596 }
1597
1598 static int echo_client_prep_commit(struct obd_export *exp, int rw,
1599                                    struct obdo *oa, struct echo_object *eco,
1600                                    obd_off offset, obd_size count,
1601                                    obd_size batch, struct obd_trans_info *oti)
1602 {
1603         struct lov_stripe_md *lsm = eco->eo_lsm;
1604         struct obd_ioobj ioo;
1605         struct niobuf_local *lnb;
1606         struct niobuf_remote *rnb;
1607         obd_off off;
1608         obd_size npages, tot_pages;
1609         int i, ret = 0;
1610         ENTRY;
1611
1612         if (count <= 0 || (count & (~CFS_PAGE_MASK)) != 0 ||
1613             (lsm != NULL && lsm->lsm_object_id != oa->o_id))
1614                 RETURN(-EINVAL);
1615
1616         npages = batch >> CFS_PAGE_SHIFT;
1617         tot_pages = count >> CFS_PAGE_SHIFT;
1618
1619         OBD_ALLOC(lnb, npages * sizeof(struct niobuf_local));
1620         OBD_ALLOC(rnb, npages * sizeof(struct niobuf_remote));
1621
1622         if (lnb == NULL || rnb == NULL)
1623                 GOTO(out, ret = -ENOMEM);
1624
1625         obdo_to_ioobj(oa, &ioo);
1626
1627         off = offset;
1628
1629         for(; tot_pages; tot_pages -= npages) {
1630                 int lpages;
1631
1632                 if (tot_pages < npages)
1633                         npages = tot_pages;
1634
1635                 for (i = 0; i < npages; i++, off += CFS_PAGE_SIZE) {
1636                         rnb[i].offset = off;
1637                         rnb[i].len = CFS_PAGE_SIZE;
1638                 }
1639
1640                 ioo.ioo_bufcnt = npages;
1641                 oti->oti_transno = 0;
1642
1643                 lpages = npages;
1644                 ret = obd_preprw(rw, exp, oa, 1, &ioo, rnb, &lpages, lnb, oti,
1645                                  NULL);
1646                 if (ret != 0)
1647                         GOTO(out, ret);
1648                 LASSERT(lpages == npages);
1649
1650                 for (i = 0; i < lpages; i++) {
1651                         cfs_page_t *page = lnb[i].page;
1652
1653                         /* read past eof? */
1654                         if (page == NULL && lnb[i].rc == 0)
1655                                 continue;
1656
1657                         if (oa->o_id == ECHO_PERSISTENT_OBJID ||
1658                             (oa->o_valid & OBD_MD_FLFLAGS) == 0 ||
1659                             (oa->o_flags & OBD_FL_DEBUG_CHECK) == 0)
1660                                 continue;
1661
1662                         if (rw == OBD_BRW_WRITE)
1663                                 echo_client_page_debug_setup(lsm, page, rw,
1664                                                              oa->o_id,
1665                                                              rnb[i].offset,
1666                                                              rnb[i].len);
1667                         else
1668                                 echo_client_page_debug_check(lsm, page,
1669                                                              oa->o_id,
1670                                                              rnb[i].offset,
1671                                                              rnb[i].len);
1672                 }
1673
1674                 ret = obd_commitrw(rw, exp, oa, 1,&ioo,rnb,npages,lnb,oti,ret);
1675                 if (ret != 0)
1676                         GOTO(out, ret);
1677
1678                 /* Reset oti otherwise it would confuse ldiskfs. */
1679                 memset(oti, 0, sizeof(*oti));
1680         }
1681
1682 out:
1683         if (lnb)
1684                 OBD_FREE(lnb, npages * sizeof(struct niobuf_local));
1685         if (rnb)
1686                 OBD_FREE(rnb, npages * sizeof(struct niobuf_remote));
1687         RETURN(ret);
1688 }
1689
1690 static int echo_client_brw_ioctl(int rw, struct obd_export *exp,
1691                                  struct obd_ioctl_data *data)
1692 {
1693         struct obd_device *obd = class_exp2obd(exp);
1694         struct echo_device *ed = obd2echo_dev(obd);
1695         struct echo_client_obd *ec = ed->ed_ec;
1696         struct obd_trans_info dummy_oti = { .oti_thread = NULL };
1697         struct obdo *oa = &data->ioc_obdo1;
1698         struct echo_object *eco;
1699         int rc;
1700         int async = 1;
1701         ENTRY;
1702
1703         LASSERT(oa->o_valid & OBD_MD_FLGROUP);
1704
1705         rc = echo_get_object(&eco, ed, oa);
1706         if (rc)
1707                 RETURN(rc);
1708
1709         oa->o_valid &= ~OBD_MD_FLHANDLE;
1710
1711         switch((long)data->ioc_pbuf1) {
1712         case 1:
1713                 async = 0;
1714                 /* fall through */
1715         case 2:
1716                 rc = echo_client_kbrw(ed, rw, oa,
1717                                       eco, data->ioc_offset,
1718                                       data->ioc_count, async, &dummy_oti);
1719                 break;
1720         case 3:
1721                 rc = echo_client_prep_commit(ec->ec_exp, rw, oa,
1722                                             eco, data->ioc_offset,
1723                                             data->ioc_count, data->ioc_plen1,
1724                                             &dummy_oti);
1725                 break;
1726         default:
1727                 rc = -EINVAL;
1728         }
1729         echo_put_object(eco);
1730         RETURN(rc);
1731 }
1732
1733 static int
1734 echo_client_enqueue(struct obd_export *exp, struct obdo *oa,
1735                     int mode, obd_off offset, obd_size nob)
1736 {
1737         struct echo_device     *ed = obd2echo_dev(exp->exp_obd);
1738         struct lustre_handle   *ulh = &oa->o_handle;
1739         struct echo_object     *eco;
1740         obd_off                 end;
1741         int                     rc;
1742         ENTRY;
1743
1744         if (ed->ed_next == NULL)
1745                 RETURN(-EOPNOTSUPP);
1746
1747         if (!(mode == LCK_PR || mode == LCK_PW))
1748                 RETURN(-EINVAL);
1749
1750         if ((offset & (~CFS_PAGE_MASK)) != 0 ||
1751             (nob & (~CFS_PAGE_MASK)) != 0)
1752                 RETURN(-EINVAL);
1753
1754         rc = echo_get_object (&eco, ed, oa);
1755         if (rc != 0)
1756                 RETURN(rc);
1757
1758         end = (nob == 0) ? ((obd_off) -1) : (offset + nob - 1);
1759         rc = cl_echo_enqueue(eco, offset, end, mode, &ulh->cookie);
1760         if (rc == 0) {
1761                 oa->o_valid |= OBD_MD_FLHANDLE;
1762                 CDEBUG(D_INFO, "Cookie is "LPX64"\n", ulh->cookie);
1763         }
1764         echo_put_object(eco);
1765         RETURN(rc);
1766 }
1767
1768 static int
1769 echo_client_cancel(struct obd_export *exp, struct obdo *oa)
1770 {
1771         struct echo_device *ed     = obd2echo_dev(exp->exp_obd);
1772         __u64               cookie = oa->o_handle.cookie;
1773
1774         if ((oa->o_valid & OBD_MD_FLHANDLE) == 0)
1775                 return -EINVAL;
1776
1777         CDEBUG(D_INFO, "Cookie is "LPX64"\n", cookie);
1778         return cl_echo_cancel(ed, cookie);
1779 }
1780
1781 static int
1782 echo_client_iocontrol(unsigned int cmd, struct obd_export *exp,
1783                       int len, void *karg, void *uarg)
1784 {
1785         struct obd_device      *obd = exp->exp_obd;
1786         struct echo_device     *ed = obd2echo_dev(obd);
1787         struct echo_client_obd *ec = ed->ed_ec;
1788         struct echo_object     *eco;
1789         struct obd_ioctl_data  *data = karg;
1790         struct obd_trans_info   dummy_oti;
1791         struct oti_req_ack_lock *ack_lock;
1792         struct obdo            *oa;
1793         int                     rw = OBD_BRW_READ;
1794         int                     rc = 0;
1795         int                     i;
1796         ENTRY;
1797
1798         cfs_unlock_kernel();
1799
1800         memset(&dummy_oti, 0, sizeof(dummy_oti));
1801
1802         oa = &data->ioc_obdo1;
1803         if (!(oa->o_valid & OBD_MD_FLGROUP)) {
1804                 oa->o_valid |= OBD_MD_FLGROUP;
1805                 oa->o_seq = FID_SEQ_ECHO;
1806         }
1807         /* assume we can touch filter native objects with echo device. */
1808         /* LASSERT(oa->o_seq == FID_SEQ_ECHO); */
1809
1810         switch (cmd) {
1811         case OBD_IOC_CREATE:                    /* may create echo object */
1812                 if (!cfs_capable(CFS_CAP_SYS_ADMIN))
1813                         GOTO (out, rc = -EPERM);
1814
1815                 rc = echo_create_object (ed, 1, oa,
1816                                          data->ioc_pbuf1, data->ioc_plen1,
1817                                          &dummy_oti);
1818                 GOTO(out, rc);
1819
1820         case OBD_IOC_DESTROY:
1821                 if (!cfs_capable(CFS_CAP_SYS_ADMIN))
1822                         GOTO (out, rc = -EPERM);
1823
1824                 rc = echo_get_object (&eco, ed, oa);
1825                 if (rc == 0) {
1826                         rc = obd_destroy(ec->ec_exp, oa, eco->eo_lsm,
1827                                          &dummy_oti, NULL, NULL);
1828                         if (rc == 0)
1829                                 eco->eo_deleted = 1;
1830                         echo_put_object(eco);
1831                 }
1832                 GOTO(out, rc);
1833
1834         case OBD_IOC_GETATTR:
1835                 rc = echo_get_object (&eco, ed, oa);
1836                 if (rc == 0) {
1837                         struct obd_info oinfo = { { { 0 } } };
1838                         oinfo.oi_md = eco->eo_lsm;
1839                         oinfo.oi_oa = oa;
1840                         rc = obd_getattr(ec->ec_exp, &oinfo);
1841                         echo_put_object(eco);
1842                 }
1843                 GOTO(out, rc);
1844
1845         case OBD_IOC_SETATTR:
1846                 if (!cfs_capable(CFS_CAP_SYS_ADMIN))
1847                         GOTO (out, rc = -EPERM);
1848
1849                 rc = echo_get_object (&eco, ed, oa);
1850                 if (rc == 0) {
1851                         struct obd_info oinfo = { { { 0 } } };
1852                         oinfo.oi_oa = oa;
1853                         oinfo.oi_md = eco->eo_lsm;
1854
1855                         rc = obd_setattr(ec->ec_exp, &oinfo, NULL);
1856                         echo_put_object(eco);
1857                 }
1858                 GOTO(out, rc);
1859
1860         case OBD_IOC_BRW_WRITE:
1861                 if (!cfs_capable(CFS_CAP_SYS_ADMIN))
1862                         GOTO (out, rc = -EPERM);
1863
1864                 rw = OBD_BRW_WRITE;
1865                 /* fall through */
1866         case OBD_IOC_BRW_READ:
1867                 rc = echo_client_brw_ioctl(rw, exp, data);
1868                 GOTO(out, rc);
1869
1870         case ECHO_IOC_GET_STRIPE:
1871                 rc = echo_get_object(&eco, ed, oa);
1872                 if (rc == 0) {
1873                         rc = echo_copyout_lsm(eco->eo_lsm, data->ioc_pbuf1,
1874                                               data->ioc_plen1);
1875                         echo_put_object(eco);
1876                 }
1877                 GOTO(out, rc);
1878
1879         case ECHO_IOC_SET_STRIPE:
1880                 if (!cfs_capable(CFS_CAP_SYS_ADMIN))
1881                         GOTO (out, rc = -EPERM);
1882
1883                 if (data->ioc_pbuf1 == NULL) {  /* unset */
1884                         rc = echo_get_object(&eco, ed, oa);
1885                         if (rc == 0) {
1886                                 eco->eo_deleted = 1;
1887                                 echo_put_object(eco);
1888                         }
1889                 } else {
1890                         rc = echo_create_object(ed, 0, oa,
1891                                                 data->ioc_pbuf1,
1892                                                 data->ioc_plen1, &dummy_oti);
1893                 }
1894                 GOTO (out, rc);
1895
1896         case ECHO_IOC_ENQUEUE:
1897                 if (!cfs_capable(CFS_CAP_SYS_ADMIN))
1898                         GOTO (out, rc = -EPERM);
1899
1900                 rc = echo_client_enqueue(exp, oa,
1901                                          data->ioc_conn1, /* lock mode */
1902                                          data->ioc_offset,
1903                                          data->ioc_count);/*extent*/
1904                 GOTO (out, rc);
1905
1906         case ECHO_IOC_CANCEL:
1907                 rc = echo_client_cancel(exp, oa);
1908                 GOTO (out, rc);
1909
1910         default:
1911                 CERROR ("echo_ioctl(): unrecognised ioctl %#x\n", cmd);
1912                 GOTO (out, rc = -ENOTTY);
1913         }
1914
1915         EXIT;
1916  out:
1917
1918         /* XXX this should be in a helper also called by target_send_reply */
1919         for (ack_lock = dummy_oti.oti_ack_locks, i = 0; i < 4;
1920              i++, ack_lock++) {
1921                 if (!ack_lock->mode)
1922                         break;
1923                 ldlm_lock_decref(&ack_lock->lock, ack_lock->mode);
1924         }
1925
1926         cfs_lock_kernel();
1927
1928         return rc;
1929 }
1930
1931 static int echo_client_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
1932 {
1933         struct echo_client_obd *ec = &obddev->u.echo_client;
1934         struct obd_device *tgt;
1935         struct obd_uuid echo_uuid = { "ECHO_UUID" };
1936         struct obd_connect_data *ocd = NULL;
1937         int rc;
1938         ENTRY;
1939
1940         if (lcfg->lcfg_bufcount < 2 || LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
1941                 CERROR("requires a TARGET OBD name\n");
1942                 RETURN(-EINVAL);
1943         }
1944
1945         tgt = class_name2obd(lustre_cfg_string(lcfg, 1));
1946         if (!tgt || !tgt->obd_attached || !tgt->obd_set_up) {
1947                 CERROR("device not attached or not set up (%s)\n",
1948                        lustre_cfg_string(lcfg, 1));
1949                 RETURN(-EINVAL);
1950         }
1951
1952         cfs_spin_lock_init (&ec->ec_lock);
1953         CFS_INIT_LIST_HEAD (&ec->ec_objects);
1954         CFS_INIT_LIST_HEAD (&ec->ec_locks);
1955         ec->ec_unique = 0;
1956         ec->ec_nstripes = 0;
1957
1958         OBD_ALLOC(ocd, sizeof(*ocd));
1959         if (ocd == NULL) {
1960                 CERROR("Can't alloc ocd connecting to %s\n",
1961                        lustre_cfg_string(lcfg, 1));
1962                 return -ENOMEM;
1963         }
1964
1965         ocd->ocd_connect_flags = OBD_CONNECT_VERSION | OBD_CONNECT_REQPORTAL |
1966                                  OBD_CONNECT_GRANT | OBD_CONNECT_FULL20;
1967         ocd->ocd_version = LUSTRE_VERSION_CODE;
1968         ocd->ocd_group = FID_SEQ_ECHO;
1969
1970         rc = obd_connect(NULL, &ec->ec_exp, tgt, &echo_uuid, ocd, NULL);
1971         if (rc == 0) {
1972                 /* Turn off pinger because it connects to tgt obd directly. */
1973                 cfs_spin_lock(&tgt->obd_dev_lock);
1974                 cfs_list_del_init(&ec->ec_exp->exp_obd_chain_timed);
1975                 cfs_spin_unlock(&tgt->obd_dev_lock);
1976         }
1977
1978         OBD_FREE(ocd, sizeof(*ocd));
1979
1980         if (rc != 0) {
1981                 CERROR("fail to connect to device %s\n",
1982                        lustre_cfg_string(lcfg, 1));
1983                 return (rc);
1984         }
1985
1986         RETURN(rc);
1987 }
1988
1989 static int echo_client_cleanup(struct obd_device *obddev)
1990 {
1991         struct echo_client_obd *ec = &obddev->u.echo_client;
1992         int rc;
1993         ENTRY;
1994
1995         if (!cfs_list_empty(&obddev->obd_exports)) {
1996                 CERROR("still has clients!\n");
1997                 RETURN(-EBUSY);
1998         }
1999
2000         LASSERT(cfs_atomic_read(&ec->ec_exp->exp_refcount) > 0);
2001         rc = obd_disconnect(ec->ec_exp);
2002         if (rc != 0)
2003                 CERROR("fail to disconnect device: %d\n", rc);
2004
2005         RETURN(rc);
2006 }
2007
2008 static int echo_client_connect(const struct lu_env *env,
2009                                struct obd_export **exp,
2010                                struct obd_device *src, struct obd_uuid *cluuid,
2011                                struct obd_connect_data *data, void *localdata)
2012 {
2013         int                rc;
2014         struct lustre_handle conn = { 0 };
2015
2016         ENTRY;
2017         rc = class_connect(&conn, src, cluuid);
2018         if (rc == 0) {
2019                 *exp = class_conn2export(&conn);
2020         }
2021
2022         RETURN (rc);
2023 }
2024
2025 static int echo_client_disconnect(struct obd_export *exp)
2026 {
2027 #if 0
2028         struct obd_device      *obd;
2029         struct echo_client_obd *ec;
2030         struct ec_lock         *ecl;
2031 #endif
2032         int                     rc;
2033         ENTRY;
2034
2035         if (exp == NULL)
2036                 GOTO(out, rc = -EINVAL);
2037
2038 #if 0
2039         obd = exp->exp_obd;
2040         ec = &obd->u.echo_client;
2041
2042         /* no more contention on export's lock list */
2043         while (!cfs_list_empty (&exp->exp_ec_data.eced_locks)) {
2044                 ecl = cfs_list_entry (exp->exp_ec_data.eced_locks.next,
2045                                       struct ec_lock, ecl_exp_chain);
2046                 cfs_list_del (&ecl->ecl_exp_chain);
2047
2048                 rc = obd_cancel(ec->ec_exp, ecl->ecl_object->eco_lsm,
2049                                  ecl->ecl_mode, &ecl->ecl_lock_handle);
2050
2051                 CDEBUG (D_INFO, "Cancel lock on object "LPX64" on disconnect "
2052                         "(%d)\n", ecl->ecl_object->eco_id, rc);
2053
2054                 echo_put_object (ecl->ecl_object);
2055                 OBD_FREE (ecl, sizeof (*ecl));
2056         }
2057 #endif
2058
2059         rc = class_disconnect(exp);
2060         GOTO(out, rc);
2061  out:
2062         return rc;
2063 }
2064
2065 static struct obd_ops echo_obd_ops = {
2066         .o_owner       = THIS_MODULE,
2067
2068 #if 0
2069         .o_setup       = echo_client_setup,
2070         .o_cleanup     = echo_client_cleanup,
2071 #endif
2072
2073         .o_iocontrol   = echo_client_iocontrol,
2074         .o_connect     = echo_client_connect,
2075         .o_disconnect  = echo_client_disconnect
2076 };
2077
2078 int echo_client_init(void)
2079 {
2080         struct lprocfs_static_vars lvars = { 0 };
2081         int rc;
2082
2083         lprocfs_echo_init_vars(&lvars);
2084         rc = class_register_type(&echo_obd_ops, NULL, lvars.module_vars,
2085                                  LUSTRE_ECHO_CLIENT_NAME, &echo_device_type);
2086         if (rc == 0)
2087                 lu_kmem_init(echo_caches);
2088         return rc;
2089 }
2090
2091 void echo_client_exit(void)
2092 {
2093         class_unregister_type(LUSTRE_ECHO_CLIENT_NAME);
2094         lu_kmem_fini(echo_caches);
2095 }
2096
2097 /** @} echo_client */