drivers/staging/lustre/lustre/obdecho/echo_client.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2012, Intel Corporation.
  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 #include <linux/libcfs/libcfs.h>
  39
  40 #include <obd.h>
  41 #include <obd_support.h>
  42 #include <obd_class.h>
  43 #include <lustre_debug.h>
  44 #include <lprocfs_status.h>
  45 #include <cl_object.h>
  46 #include <lustre_fid.h>
  47 #include <lustre_acl.h>
  48 #include <lustre_net.h>
  49 #include <obd_lov.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         int                  ed_next_ismd;
  66         struct lu_client_seq   *ed_cl_seq;
  67 };
  68
  69 struct echo_object {
  70         struct cl_object        eo_cl;
  71         struct cl_object_header eo_hdr;
  72
  73         struct echo_device     *eo_dev;
  74         struct list_head              eo_obj_chain;
  75         struct lov_stripe_md   *eo_lsm;
  76         atomic_t            eo_npages;
  77         int                  eo_deleted;
  78 };
  79
  80 struct echo_object_conf {
  81         struct cl_object_conf  eoc_cl;
  82         struct lov_stripe_md **eoc_md;
  83 };
  84
  85 struct echo_page {
  86         struct cl_page_slice   ep_cl;
  87         struct mutex            ep_lock;
  88         struct page         *ep_vmpage;
  89 };
  90
  91 struct echo_lock {
  92         struct cl_lock_slice   el_cl;
  93         struct list_head             el_chain;
  94         struct echo_object    *el_object;
  95         __u64             el_cookie;
  96         atomic_t           el_refcount;
  97 };
  98
  99 struct echo_io {
 100         struct cl_io_slice     ei_cl;
 101 };
 102
 103 #if 0
 104 struct echo_req {
 105         struct cl_req_slice er_cl;
 106 };
 107 #endif
 108
 109 static int echo_client_setup(const struct lu_env *env,
 110                              struct obd_device *obddev,
 111                              struct lustre_cfg *lcfg);
 112 static int echo_client_cleanup(struct obd_device *obddev);
 113
 114
 115 /** \defgroup echo_helpers Helper functions
 116  * @{
 117  */
 118 static inline struct echo_device *cl2echo_dev(const struct cl_device *dev)
 119 {
 120         return container_of0(dev, struct echo_device, ed_cl);
 121 }
 122
 123 static inline struct cl_device *echo_dev2cl(struct echo_device *d)
 124 {
 125         return &d->ed_cl;
 126 }
 127
 128 static inline struct echo_device *obd2echo_dev(const struct obd_device *obd)
 129 {
 130         return cl2echo_dev(lu2cl_dev(obd->obd_lu_dev));
 131 }
 132
 133 static inline struct cl_object *echo_obj2cl(struct echo_object *eco)
 134 {
 135         return &eco->eo_cl;
 136 }
 137
 138 static inline struct echo_object *cl2echo_obj(const struct cl_object *o)
 139 {
 140         return container_of(o, struct echo_object, eo_cl);
 141 }
 142
 143 static inline struct echo_page *cl2echo_page(const struct cl_page_slice *s)
 144 {
 145         return container_of(s, struct echo_page, ep_cl);
 146 }
 147
 148 static inline struct echo_lock *cl2echo_lock(const struct cl_lock_slice *s)
 149 {
 150         return container_of(s, struct echo_lock, el_cl);
 151 }
 152
 153 static inline struct cl_lock *echo_lock2cl(const struct echo_lock *ecl)
 154 {
 155         return ecl->el_cl.cls_lock;
 156 }
 157
 158 static struct lu_context_key echo_thread_key;
 159 static inline struct echo_thread_info *echo_env_info(const struct lu_env *env)
 160 {
 161         struct echo_thread_info *info;
 162         info = lu_context_key_get(&env->le_ctx, &echo_thread_key);
 163         LASSERT(info != NULL);
 164         return info;
 165 }
 166
 167 static inline
 168 struct echo_object_conf *cl2echo_conf(const struct cl_object_conf *c)
 169 {
 170         return container_of(c, struct echo_object_conf, eoc_cl);
 171 }
 172
 173 /** @} echo_helpers */
 174
 175 static struct echo_object *cl_echo_object_find(struct echo_device *d,
 176                                                struct lov_stripe_md **lsm);
 177 static int cl_echo_object_put(struct echo_object *eco);
 178 static int cl_echo_enqueue   (struct echo_object *eco, obd_off start,
 179                               obd_off end, int mode, __u64 *cookie);
 180 static int cl_echo_cancel    (struct echo_device *d, __u64 cookie);
 181 static int cl_echo_object_brw(struct echo_object *eco, int rw, obd_off offset,
 182                               struct page **pages, int npages, int async);
 183
 184 static struct echo_thread_info *echo_env_info(const struct lu_env *env);
 185
 186 struct echo_thread_info {
 187         struct echo_object_conf eti_conf;
 188         struct lustre_md        eti_md;
 189
 190         struct cl_2queue        eti_queue;
 191         struct cl_io        eti_io;
 192         struct cl_lock_descr    eti_descr;
 193         struct lu_fid      eti_fid;
 194         struct lu_fid           eti_fid2;
 195         struct md_op_spec       eti_spec;
 196         struct lov_mds_md_v3    eti_lmm;
 197         struct lov_user_md_v3   eti_lum;
 198         struct md_attr    eti_ma;
 199         struct lu_name    eti_lname;
 200         /* per-thread values, can be re-used */
 201         void                    *eti_big_lmm;
 202         int                     eti_big_lmmsize;
 203         char                eti_name[20];
 204         struct lu_buf      eti_buf;
 205         char                eti_xattr_buf[LUSTRE_POSIX_ACL_MAX_SIZE];
 206 };
 207
 208 /* No session used right now */
 209 struct echo_session_info {
 210         unsigned long dummy;
 211 };
 212
 213 static struct kmem_cache *echo_lock_kmem;
 214 static struct kmem_cache *echo_object_kmem;
 215 static struct kmem_cache *echo_thread_kmem;
 216 static struct kmem_cache *echo_session_kmem;
 217 //static struct kmem_cache *echo_req_kmem;
 218
 219 static struct lu_kmem_descr echo_caches[] = {
 220         {
 221                 .ckd_cache = &echo_lock_kmem,
 222                 .ckd_name  = "echo_lock_kmem",
 223                 .ckd_size  = sizeof (struct echo_lock)
 224         },
 225         {
 226                 .ckd_cache = &echo_object_kmem,
 227                 .ckd_name  = "echo_object_kmem",
 228                 .ckd_size  = sizeof (struct echo_object)
 229         },
 230         {
 231                 .ckd_cache = &echo_thread_kmem,
 232                 .ckd_name  = "echo_thread_kmem",
 233                 .ckd_size  = sizeof (struct echo_thread_info)
 234         },
 235         {
 236                 .ckd_cache = &echo_session_kmem,
 237                 .ckd_name  = "echo_session_kmem",
 238                 .ckd_size  = sizeof (struct echo_session_info)
 239         },
 240 #if 0
 241         {
 242                 .ckd_cache = &echo_req_kmem,
 243                 .ckd_name  = "echo_req_kmem",
 244                 .ckd_size  = sizeof (struct echo_req)
 245         },
 246 #endif
 247         {
 248                 .ckd_cache = NULL
 249         }
 250 };
 251
 252 /** \defgroup echo_page Page operations
 253  *
 254  * Echo page operations.
 255  *
 256  * @{
 257  */
 258 static struct page *echo_page_vmpage(const struct lu_env *env,
 259                                     const struct cl_page_slice *slice)
 260 {
 261         return cl2echo_page(slice)->ep_vmpage;
 262 }
 263
 264 static int echo_page_own(const struct lu_env *env,
 265                          const struct cl_page_slice *slice,
 266                          struct cl_io *io, int nonblock)
 267 {
 268         struct echo_page *ep = cl2echo_page(slice);
 269
 270         if (!nonblock)
 271                 mutex_lock(&ep->ep_lock);
 272         else if (!mutex_trylock(&ep->ep_lock))
 273                 return -EAGAIN;
 274         return 0;
 275 }
 276
 277 static void echo_page_disown(const struct lu_env *env,
 278                              const struct cl_page_slice *slice,
 279                              struct cl_io *io)
 280 {
 281         struct echo_page *ep = cl2echo_page(slice);
 282
 283         LASSERT(mutex_is_locked(&ep->ep_lock));
 284         mutex_unlock(&ep->ep_lock);
 285 }
 286
 287 static void echo_page_discard(const struct lu_env *env,
 288                               const struct cl_page_slice *slice,
 289                               struct cl_io *unused)
 290 {
 291         cl_page_delete(env, slice->cpl_page);
 292 }
 293
 294 static int echo_page_is_vmlocked(const struct lu_env *env,
 295                                  const struct cl_page_slice *slice)
 296 {
 297         if (mutex_is_locked(&cl2echo_page(slice)->ep_lock))
 298                 return -EBUSY;
 299         return -ENODATA;
 300 }
 301
 302 static void echo_page_completion(const struct lu_env *env,
 303                                  const struct cl_page_slice *slice,
 304                                  int ioret)
 305 {
 306         LASSERT(slice->cpl_page->cp_sync_io != NULL);
 307 }
 308
 309 static void echo_page_fini(const struct lu_env *env,
 310                            struct cl_page_slice *slice)
 311 {
 312         struct echo_page *ep    = cl2echo_page(slice);
 313         struct echo_object *eco = cl2echo_obj(slice->cpl_obj);
 314         struct page *vmpage      = ep->ep_vmpage;
 315         ENTRY;
 316
 317         atomic_dec(&eco->eo_npages);
 318         page_cache_release(vmpage);
 319         EXIT;
 320 }
 321
 322 static int echo_page_prep(const struct lu_env *env,
 323                           const struct cl_page_slice *slice,
 324                           struct cl_io *unused)
 325 {
 326         return 0;
 327 }
 328
 329 static int echo_page_print(const struct lu_env *env,
 330                            const struct cl_page_slice *slice,
 331                            void *cookie, lu_printer_t printer)
 332 {
 333         struct echo_page *ep = cl2echo_page(slice);
 334
 335         (*printer)(env, cookie, LUSTRE_ECHO_CLIENT_NAME"-page@%p %d vm@%p\n",
 336                    ep, mutex_is_locked(&ep->ep_lock), ep->ep_vmpage);
 337         return 0;
 338 }
 339
 340 static const struct cl_page_operations echo_page_ops = {
 341         .cpo_own           = echo_page_own,
 342         .cpo_disown     = echo_page_disown,
 343         .cpo_discard       = echo_page_discard,
 344         .cpo_vmpage     = echo_page_vmpage,
 345         .cpo_fini         = echo_page_fini,
 346         .cpo_print       = echo_page_print,
 347         .cpo_is_vmlocked   = echo_page_is_vmlocked,
 348         .io = {
 349                 [CRT_READ] = {
 350                         .cpo_prep       = echo_page_prep,
 351                         .cpo_completion  = echo_page_completion,
 352                 },
 353                 [CRT_WRITE] = {
 354                         .cpo_prep       = echo_page_prep,
 355                         .cpo_completion  = echo_page_completion,
 356                 }
 357         }
 358 };
 359 /** @} echo_page */
 360
 361 /** \defgroup echo_lock Locking
 362  *
 363  * echo lock operations
 364  *
 365  * @{
 366  */
 367 static void echo_lock_fini(const struct lu_env *env,
 368                            struct cl_lock_slice *slice)
 369 {
 370         struct echo_lock *ecl = cl2echo_lock(slice);
 371
 372         LASSERT(list_empty(&ecl->el_chain));
 373         OBD_SLAB_FREE_PTR(ecl, echo_lock_kmem);
 374 }
 375
 376 static void echo_lock_delete(const struct lu_env *env,
 377                              const struct cl_lock_slice *slice)
 378 {
 379         struct echo_lock *ecl      = cl2echo_lock(slice);
 380
 381         LASSERT(list_empty(&ecl->el_chain));
 382 }
 383
 384 static int echo_lock_fits_into(const struct lu_env *env,
 385                                const struct cl_lock_slice *slice,
 386                                const struct cl_lock_descr *need,
 387                                const struct cl_io *unused)
 388 {
 389         return 1;
 390 }
 391
 392 static struct cl_lock_operations echo_lock_ops = {
 393         .clo_fini      = echo_lock_fini,
 394         .clo_delete    = echo_lock_delete,
 395         .clo_fits_into = echo_lock_fits_into
 396 };
 397
 398 /** @} echo_lock */
 399
 400 /** \defgroup echo_cl_ops cl_object operations
 401  *
 402  * operations for cl_object
 403  *
 404  * @{
 405  */
 406 static int echo_page_init(const struct lu_env *env, struct cl_object *obj,
 407                         struct cl_page *page, struct page *vmpage)
 408 {
 409         struct echo_page *ep = cl_object_page_slice(obj, page);
 410         struct echo_object *eco = cl2echo_obj(obj);
 411         ENTRY;
 412
 413         ep->ep_vmpage = vmpage;
 414         page_cache_get(vmpage);
 415         mutex_init(&ep->ep_lock);
 416         cl_page_slice_add(page, &ep->ep_cl, obj, &echo_page_ops);
 417         atomic_inc(&eco->eo_npages);
 418         RETURN(0);
 419 }
 420
 421 static int echo_io_init(const struct lu_env *env, struct cl_object *obj,
 422                         struct cl_io *io)
 423 {
 424         return 0;
 425 }
 426
 427 static int echo_lock_init(const struct lu_env *env,
 428                           struct cl_object *obj, struct cl_lock *lock,
 429                           const struct cl_io *unused)
 430 {
 431         struct echo_lock *el;
 432         ENTRY;
 433
 434         OBD_SLAB_ALLOC_PTR_GFP(el, echo_lock_kmem, __GFP_IO);
 435         if (el != NULL) {
 436                 cl_lock_slice_add(lock, &el->el_cl, obj, &echo_lock_ops);
 437                 el->el_object = cl2echo_obj(obj);
 438                 INIT_LIST_HEAD(&el->el_chain);
 439                 atomic_set(&el->el_refcount, 0);
 440         }
 441         RETURN(el == NULL ? -ENOMEM : 0);
 442 }
 443
 444 static int echo_conf_set(const struct lu_env *env, struct cl_object *obj,
 445                          const struct cl_object_conf *conf)
 446 {
 447         return 0;
 448 }
 449
 450 static const struct cl_object_operations echo_cl_obj_ops = {
 451         .coo_page_init = echo_page_init,
 452         .coo_lock_init = echo_lock_init,
 453         .coo_io_init   = echo_io_init,
 454         .coo_conf_set  = echo_conf_set
 455 };
 456 /** @} echo_cl_ops */
 457
 458 /** \defgroup echo_lu_ops lu_object operations
 459  *
 460  * operations for echo lu object.
 461  *
 462  * @{
 463  */
 464 static int echo_object_init(const struct lu_env *env, struct lu_object *obj,
 465                             const struct lu_object_conf *conf)
 466 {
 467         struct echo_device *ed   = cl2echo_dev(lu2cl_dev(obj->lo_dev));
 468         struct echo_client_obd *ec     = ed->ed_ec;
 469         struct echo_object *eco = cl2echo_obj(lu2cl(obj));
 470         ENTRY;
 471
 472         if (ed->ed_next) {
 473                 struct lu_object  *below;
 474                 struct lu_device  *under;
 475
 476                 under = ed->ed_next;
 477                 below = under->ld_ops->ldo_object_alloc(env, obj->lo_header,
 478                                                         under);
 479                 if (below == NULL)
 480                         RETURN(-ENOMEM);
 481                 lu_object_add(obj, below);
 482         }
 483
 484         if (!ed->ed_next_ismd) {
 485                 const struct cl_object_conf *cconf = lu2cl_conf(conf);
 486                 struct echo_object_conf *econf = cl2echo_conf(cconf);
 487
 488                 LASSERT(econf->eoc_md);
 489                 eco->eo_lsm = *econf->eoc_md;
 490                 /* clear the lsm pointer so that it won't get freed. */
 491                 *econf->eoc_md = NULL;
 492         } else {
 493                 eco->eo_lsm = NULL;
 494         }
 495
 496         eco->eo_dev = ed;
 497         atomic_set(&eco->eo_npages, 0);
 498         cl_object_page_init(lu2cl(obj), sizeof(struct echo_page));
 499
 500         spin_lock(&ec->ec_lock);
 501         list_add_tail(&eco->eo_obj_chain, &ec->ec_objects);
 502         spin_unlock(&ec->ec_lock);
 503
 504         RETURN(0);
 505 }
 506
 507 /* taken from osc_unpackmd() */
 508 static int echo_alloc_memmd(struct echo_device *ed,
 509                             struct lov_stripe_md **lsmp)
 510 {
 511         int lsm_size;
 512
 513         ENTRY;
 514
 515         /* If export is lov/osc then use their obd method */
 516         if (ed->ed_next != NULL)
 517                 return obd_alloc_memmd(ed->ed_ec->ec_exp, lsmp);
 518         /* OFD has no unpackmd method, do everything here */
 519         lsm_size = lov_stripe_md_size(1);
 520
 521         LASSERT(*lsmp == NULL);
 522         OBD_ALLOC(*lsmp, lsm_size);
 523         if (*lsmp == NULL)
 524                 RETURN(-ENOMEM);
 525
 526         OBD_ALLOC((*lsmp)->lsm_oinfo[0], sizeof(struct lov_oinfo));
 527         if ((*lsmp)->lsm_oinfo[0] == NULL) {
 528                 OBD_FREE(*lsmp, lsm_size);
 529                 RETURN(-ENOMEM);
 530         }
 531
 532         loi_init((*lsmp)->lsm_oinfo[0]);
 533         (*lsmp)->lsm_maxbytes = LUSTRE_STRIPE_MAXBYTES;
 534         ostid_set_seq_echo(&(*lsmp)->lsm_oi);
 535
 536         RETURN(lsm_size);
 537 }
 538
 539 static int echo_free_memmd(struct echo_device *ed, struct lov_stripe_md **lsmp)
 540 {
 541         int lsm_size;
 542
 543         ENTRY;
 544
 545         /* If export is lov/osc then use their obd method */
 546         if (ed->ed_next != NULL)
 547                 return obd_free_memmd(ed->ed_ec->ec_exp, lsmp);
 548         /* OFD has no unpackmd method, do everything here */
 549         lsm_size = lov_stripe_md_size(1);
 550
 551         LASSERT(*lsmp != NULL);
 552         OBD_FREE((*lsmp)->lsm_oinfo[0], sizeof(struct lov_oinfo));
 553         OBD_FREE(*lsmp, lsm_size);
 554         *lsmp = NULL;
 555         RETURN(0);
 556 }
 557
 558 static void echo_object_free(const struct lu_env *env, struct lu_object *obj)
 559 {
 560         struct echo_object *eco    = cl2echo_obj(lu2cl(obj));
 561         struct echo_client_obd *ec = eco->eo_dev->ed_ec;
 562         ENTRY;
 563
 564         LASSERT(atomic_read(&eco->eo_npages) == 0);
 565
 566         spin_lock(&ec->ec_lock);
 567         list_del_init(&eco->eo_obj_chain);
 568         spin_unlock(&ec->ec_lock);
 569
 570         lu_object_fini(obj);
 571         lu_object_header_fini(obj->lo_header);
 572
 573         if (eco->eo_lsm)
 574                 echo_free_memmd(eco->eo_dev, &eco->eo_lsm);
 575         OBD_SLAB_FREE_PTR(eco, echo_object_kmem);
 576         EXIT;
 577 }
 578
 579 static int echo_object_print(const struct lu_env *env, void *cookie,
 580                             lu_printer_t p, const struct lu_object *o)
 581 {
 582         struct echo_object *obj = cl2echo_obj(lu2cl(o));
 583
 584         return (*p)(env, cookie, "echoclient-object@%p", obj);
 585 }
 586
 587 static const struct lu_object_operations echo_lu_obj_ops = {
 588         .loo_object_init      = echo_object_init,
 589         .loo_object_delete    = NULL,
 590         .loo_object_release   = NULL,
 591         .loo_object_free      = echo_object_free,
 592         .loo_object_print     = echo_object_print,
 593         .loo_object_invariant = NULL
 594 };
 595 /** @} echo_lu_ops */
 596
 597 /** \defgroup echo_lu_dev_ops  lu_device operations
 598  *
 599  * Operations for echo lu device.
 600  *
 601  * @{
 602  */
 603 static struct lu_object *echo_object_alloc(const struct lu_env *env,
 604                                            const struct lu_object_header *hdr,
 605                                            struct lu_device *dev)
 606 {
 607         struct echo_object *eco;
 608         struct lu_object *obj = NULL;
 609         ENTRY;
 610
 611         /* we're the top dev. */
 612         LASSERT(hdr == NULL);
 613         OBD_SLAB_ALLOC_PTR_GFP(eco, echo_object_kmem, __GFP_IO);
 614         if (eco != NULL) {
 615                 struct cl_object_header *hdr = &eco->eo_hdr;
 616
 617                 obj = &echo_obj2cl(eco)->co_lu;
 618                 cl_object_header_init(hdr);
 619                 lu_object_init(obj, &hdr->coh_lu, dev);
 620                 lu_object_add_top(&hdr->coh_lu, obj);
 621
 622                 eco->eo_cl.co_ops = &echo_cl_obj_ops;
 623                 obj->lo_ops       = &echo_lu_obj_ops;
 624         }
 625         RETURN(obj);
 626 }
 627
 628 static struct lu_device_operations echo_device_lu_ops = {
 629         .ldo_object_alloc   = echo_object_alloc,
 630 };
 631
 632 /** @} echo_lu_dev_ops */
 633
 634 static struct cl_device_operations echo_device_cl_ops = {
 635 };
 636
 637 /** \defgroup echo_init Setup and teardown
 638  *
 639  * Init and fini functions for echo client.
 640  *
 641  * @{
 642  */
 643 static int echo_site_init(const struct lu_env *env, struct echo_device *ed)
 644 {
 645         struct cl_site *site = &ed->ed_site_myself;
 646         int rc;
 647
 648         /* initialize site */
 649         rc = cl_site_init(site, &ed->ed_cl);
 650         if (rc) {
 651                 CERROR("Cannot initilize site for echo client(%d)\n", rc);
 652                 return rc;
 653         }
 654
 655         rc = lu_site_init_finish(&site->cs_lu);
 656         if (rc)
 657                 return rc;
 658
 659         ed->ed_site = site;
 660         return 0;
 661 }
 662
 663 static void echo_site_fini(const struct lu_env *env, struct echo_device *ed)
 664 {
 665         if (ed->ed_site) {
 666                 if (!ed->ed_next_ismd)
 667                         cl_site_fini(ed->ed_site);
 668                 ed->ed_site = NULL;
 669         }
 670 }
 671
 672 static void *echo_thread_key_init(const struct lu_context *ctx,
 673                           struct lu_context_key *key)
 674 {
 675         struct echo_thread_info *info;
 676
 677         OBD_SLAB_ALLOC_PTR_GFP(info, echo_thread_kmem, __GFP_IO);
 678         if (info == NULL)
 679                 info = ERR_PTR(-ENOMEM);
 680         return info;
 681 }
 682
 683 static void echo_thread_key_fini(const struct lu_context *ctx,
 684                          struct lu_context_key *key, void *data)
 685 {
 686         struct echo_thread_info *info = data;
 687         OBD_SLAB_FREE_PTR(info, echo_thread_kmem);
 688 }
 689
 690 static void echo_thread_key_exit(const struct lu_context *ctx,
 691                          struct lu_context_key *key, void *data)
 692 {
 693 }
 694
 695 static struct lu_context_key echo_thread_key = {
 696         .lct_tags = LCT_CL_THREAD,
 697         .lct_init = echo_thread_key_init,
 698         .lct_fini = echo_thread_key_fini,
 699         .lct_exit = echo_thread_key_exit
 700 };
 701
 702 static void *echo_session_key_init(const struct lu_context *ctx,
 703                                   struct lu_context_key *key)
 704 {
 705         struct echo_session_info *session;
 706
 707         OBD_SLAB_ALLOC_PTR_GFP(session, echo_session_kmem, __GFP_IO);
 708         if (session == NULL)
 709                 session = ERR_PTR(-ENOMEM);
 710         return session;
 711 }
 712
 713 static void echo_session_key_fini(const struct lu_context *ctx,
 714                                  struct lu_context_key *key, void *data)
 715 {
 716         struct echo_session_info *session = data;
 717         OBD_SLAB_FREE_PTR(session, echo_session_kmem);
 718 }
 719
 720 static void echo_session_key_exit(const struct lu_context *ctx,
 721                                  struct lu_context_key *key, void *data)
 722 {
 723 }
 724
 725 static struct lu_context_key echo_session_key = {
 726         .lct_tags = LCT_SESSION,
 727         .lct_init = echo_session_key_init,
 728         .lct_fini = echo_session_key_fini,
 729         .lct_exit = echo_session_key_exit
 730 };
 731
 732 LU_TYPE_INIT_FINI(echo, &echo_thread_key, &echo_session_key);
 733
 734 #define ECHO_SEQ_WIDTH 0xffffffff
 735 static int echo_fid_init(struct echo_device *ed, char *obd_name,
 736                          struct seq_server_site *ss)
 737 {
 738         char *prefix;
 739         int rc;
 740         ENTRY;
 741
 742         OBD_ALLOC_PTR(ed->ed_cl_seq);
 743         if (ed->ed_cl_seq == NULL)
 744                 RETURN(-ENOMEM);
 745
 746         OBD_ALLOC(prefix, MAX_OBD_NAME + 5);
 747         if (prefix == NULL)
 748                 GOTO(out_free_seq, rc = -ENOMEM);
 749
 750         snprintf(prefix, MAX_OBD_NAME + 5, "srv-%s", obd_name);
 751
 752         /* Init client side sequence-manager */
 753         rc = seq_client_init(ed->ed_cl_seq, NULL,
 754                              LUSTRE_SEQ_METADATA,
 755                              prefix, ss->ss_server_seq);
 756         ed->ed_cl_seq->lcs_width = ECHO_SEQ_WIDTH;
 757         OBD_FREE(prefix, MAX_OBD_NAME + 5);
 758         if (rc)
 759                 GOTO(out_free_seq, rc);
 760
 761         RETURN(0);
 762
 763 out_free_seq:
 764         OBD_FREE_PTR(ed->ed_cl_seq);
 765         ed->ed_cl_seq = NULL;
 766         RETURN(rc);
 767 }
 768
 769 static int echo_fid_fini(struct obd_device *obddev)
 770 {
 771         struct echo_device *ed = obd2echo_dev(obddev);
 772         ENTRY;
 773
 774         if (ed->ed_cl_seq != NULL) {
 775                 seq_client_fini(ed->ed_cl_seq);
 776                 OBD_FREE_PTR(ed->ed_cl_seq);
 777                 ed->ed_cl_seq = NULL;
 778         }
 779
 780         RETURN(0);
 781 }
 782
 783 static struct lu_device *echo_device_alloc(const struct lu_env *env,
 784                                            struct lu_device_type *t,
 785                                            struct lustre_cfg *cfg)
 786 {
 787         struct lu_device   *next;
 788         struct echo_device *ed;
 789         struct cl_device   *cd;
 790         struct obd_device  *obd = NULL; /* to keep compiler happy */
 791         struct obd_device  *tgt;
 792         const char *tgt_type_name;
 793         int rc;
 794         int cleanup = 0;
 795         ENTRY;
 796
 797         OBD_ALLOC_PTR(ed);
 798         if (ed == NULL)
 799                 GOTO(out, rc = -ENOMEM);
 800
 801         cleanup = 1;
 802         cd = &ed->ed_cl;
 803         rc = cl_device_init(cd, t);
 804         if (rc)
 805                 GOTO(out, rc);
 806
 807         cd->cd_lu_dev.ld_ops = &echo_device_lu_ops;
 808         cd->cd_ops = &echo_device_cl_ops;
 809
 810         cleanup = 2;
 811         obd = class_name2obd(lustre_cfg_string(cfg, 0));
 812         LASSERT(obd != NULL);
 813         LASSERT(env != NULL);
 814
 815         tgt = class_name2obd(lustre_cfg_string(cfg, 1));
 816         if (tgt == NULL) {
 817                 CERROR("Can not find tgt device %s\n",
 818                         lustre_cfg_string(cfg, 1));
 819                 GOTO(out, rc = -ENODEV);
 820         }
 821
 822         next = tgt->obd_lu_dev;
 823         if (!strcmp(tgt->obd_type->typ_name, LUSTRE_MDT_NAME)) {
 824                 ed->ed_next_ismd = 1;
 825         } else {
 826                 ed->ed_next_ismd = 0;
 827                 rc = echo_site_init(env, ed);
 828                 if (rc)
 829                         GOTO(out, rc);
 830         }
 831         cleanup = 3;
 832
 833         rc = echo_client_setup(env, obd, cfg);
 834         if (rc)
 835                 GOTO(out, rc);
 836
 837         ed->ed_ec = &obd->u.echo_client;
 838         cleanup = 4;
 839
 840         if (ed->ed_next_ismd) {
 841                 /* Suppose to connect to some Metadata layer */
 842                 struct lu_site *ls;
 843                 struct lu_device *ld;
 844                 int    found = 0;
 845
 846                 if (next == NULL) {
 847                         CERROR("%s is not lu device type!\n",
 848                                lustre_cfg_string(cfg, 1));
 849                         GOTO(out, rc = -EINVAL);
 850                 }
 851
 852                 tgt_type_name = lustre_cfg_string(cfg, 2);
 853                 if (!tgt_type_name) {
 854                         CERROR("%s no type name for echo %s setup\n",
 855                                 lustre_cfg_string(cfg, 1),
 856                                 tgt->obd_type->typ_name);
 857                         GOTO(out, rc = -EINVAL);
 858                 }
 859
 860                 ls = next->ld_site;
 861
 862                 spin_lock(&ls->ls_ld_lock);
 863                 list_for_each_entry(ld, &ls->ls_ld_linkage, ld_linkage) {
 864                         if (strcmp(ld->ld_type->ldt_name, tgt_type_name) == 0) {
 865                                 found = 1;
 866                                 break;
 867                         }
 868                 }
 869                 spin_unlock(&ls->ls_ld_lock);
 870
 871                 if (found == 0) {
 872                         CERROR("%s is not lu device type!\n",
 873                                lustre_cfg_string(cfg, 1));
 874                         GOTO(out, rc = -EINVAL);
 875                 }
 876
 877                 next = ld;
 878                 /* For MD echo client, it will use the site in MDS stack */
 879                 ed->ed_site_myself.cs_lu = *ls;
 880                 ed->ed_site = &ed->ed_site_myself;
 881                 ed->ed_cl.cd_lu_dev.ld_site = &ed->ed_site_myself.cs_lu;
 882                 rc = echo_fid_init(ed, obd->obd_name, lu_site2seq(ls));
 883                 if (rc) {
 884                         CERROR("echo fid init error %d\n", rc);
 885                         GOTO(out, rc);
 886                 }
 887         } else {
 888                  /* if echo client is to be stacked upon ost device, the next is
 889                   * NULL since ost is not a clio device so far */
 890                 if (next != NULL && !lu_device_is_cl(next))
 891                         next = NULL;
 892
 893                 tgt_type_name = tgt->obd_type->typ_name;
 894                 if (next != NULL) {
 895                         LASSERT(next != NULL);
 896                         if (next->ld_site != NULL)
 897                                 GOTO(out, rc = -EBUSY);
 898
 899                         next->ld_site = &ed->ed_site->cs_lu;
 900                         rc = next->ld_type->ldt_ops->ldto_device_init(env, next,
 901                                                      next->ld_type->ldt_name,
 902                                                      NULL);
 903                         if (rc)
 904                                 GOTO(out, rc);
 905
 906                         /* Tricky case, I have to determine the obd type since
 907                          * CLIO uses the different parameters to initialize
 908                          * objects for lov & osc. */
 909                         if (strcmp(tgt_type_name, LUSTRE_LOV_NAME) == 0)
 910                                 ed->ed_next_islov = 1;
 911                         else
 912                                 LASSERT(strcmp(tgt_type_name,
 913                                                LUSTRE_OSC_NAME) == 0);
 914                 } else
 915                         LASSERT(strcmp(tgt_type_name, LUSTRE_OST_NAME) == 0);
 916         }
 917
 918         ed->ed_next = next;
 919         RETURN(&cd->cd_lu_dev);
 920 out:
 921         switch(cleanup) {
 922         case 4: {
 923                 int rc2;
 924                 rc2 = echo_client_cleanup(obd);
 925                 if (rc2)
 926                         CERROR("Cleanup obd device %s error(%d)\n",
 927                                obd->obd_name, rc2);
 928         }
 929
 930         case 3:
 931                 echo_site_fini(env, ed);
 932         case 2:
 933                 cl_device_fini(&ed->ed_cl);
 934         case 1:
 935                 OBD_FREE_PTR(ed);
 936         case 0:
 937         default:
 938                 break;
 939         }
 940         return(ERR_PTR(rc));
 941 }
 942
 943 static int echo_device_init(const struct lu_env *env, struct lu_device *d,
 944                           const char *name, struct lu_device *next)
 945 {
 946         LBUG();
 947         return 0;
 948 }
 949
 950 static struct lu_device *echo_device_fini(const struct lu_env *env,
 951                                           struct lu_device *d)
 952 {
 953         struct echo_device *ed = cl2echo_dev(lu2cl_dev(d));
 954         struct lu_device *next = ed->ed_next;
 955
 956         while (next && !ed->ed_next_ismd)
 957                 next = next->ld_type->ldt_ops->ldto_device_fini(env, next);
 958         return NULL;
 959 }
 960
 961 static void echo_lock_release(const struct lu_env *env,
 962                               struct echo_lock *ecl,
 963                               int still_used)
 964 {
 965         struct cl_lock *clk = echo_lock2cl(ecl);
 966
 967         cl_lock_get(clk);
 968         cl_unuse(env, clk);
 969         cl_lock_release(env, clk, "ec enqueue", ecl->el_object);
 970         if (!still_used) {
 971                 cl_lock_mutex_get(env, clk);
 972                 cl_lock_cancel(env, clk);
 973                 cl_lock_delete(env, clk);
 974                 cl_lock_mutex_put(env, clk);
 975         }
 976         cl_lock_put(env, clk);
 977 }
 978
 979 static struct lu_device *echo_device_free(const struct lu_env *env,
 980                                           struct lu_device *d)
 981 {
 982         struct echo_device     *ed   = cl2echo_dev(lu2cl_dev(d));
 983         struct echo_client_obd *ec   = ed->ed_ec;
 984         struct echo_object     *eco;
 985         struct lu_device       *next = ed->ed_next;
 986
 987         CDEBUG(D_INFO, "echo device:%p is going to be freed, next = %p\n",
 988                ed, next);
 989
 990         lu_site_purge(env, &ed->ed_site->cs_lu, -1);
 991
 992         /* check if there are objects still alive.
 993          * It shouldn't have any object because lu_site_purge would cleanup
 994          * all of cached objects. Anyway, probably the echo device is being
 995          * parallelly accessed.
 996          */
 997         spin_lock(&ec->ec_lock);
 998         list_for_each_entry(eco, &ec->ec_objects, eo_obj_chain)
 999                 eco->eo_deleted = 1;
1000         spin_unlock(&ec->ec_lock);
1001
1002         /* purge again */
1003         lu_site_purge(env, &ed->ed_site->cs_lu, -1);
1004
1005         CDEBUG(D_INFO,
1006                "Waiting for the reference of echo object to be dropped\n");
1007
1008         /* Wait for the last reference to be dropped. */
1009         spin_lock(&ec->ec_lock);
1010         while (!list_empty(&ec->ec_objects)) {
1011                 spin_unlock(&ec->ec_lock);
1012                 CERROR("echo_client still has objects at cleanup time, "
1013                        "wait for 1 second\n");
1014                 schedule_timeout_and_set_state(TASK_UNINTERRUPTIBLE,
1015                                                    cfs_time_seconds(1));
1016                 lu_site_purge(env, &ed->ed_site->cs_lu, -1);
1017                 spin_lock(&ec->ec_lock);
1018         }
1019         spin_unlock(&ec->ec_lock);
1020
1021         LASSERT(list_empty(&ec->ec_locks));
1022
1023         CDEBUG(D_INFO, "No object exists, exiting...\n");
1024
1025         echo_client_cleanup(d->ld_obd);
1026         echo_fid_fini(d->ld_obd);
1027         while (next && !ed->ed_next_ismd)
1028                 next = next->ld_type->ldt_ops->ldto_device_free(env, next);
1029
1030         LASSERT(ed->ed_site == lu2cl_site(d->ld_site));
1031         echo_site_fini(env, ed);
1032         cl_device_fini(&ed->ed_cl);
1033         OBD_FREE_PTR(ed);
1034
1035         return NULL;
1036 }
1037
1038 static const struct lu_device_type_operations echo_device_type_ops = {
1039         .ldto_init = echo_type_init,
1040         .ldto_fini = echo_type_fini,
1041
1042         .ldto_start = echo_type_start,
1043         .ldto_stop  = echo_type_stop,
1044
1045         .ldto_device_alloc = echo_device_alloc,
1046         .ldto_device_free  = echo_device_free,
1047         .ldto_device_init  = echo_device_init,
1048         .ldto_device_fini  = echo_device_fini
1049 };
1050
1051 static struct lu_device_type echo_device_type = {
1052         .ldt_tags     = LU_DEVICE_CL,
1053         .ldt_name     = LUSTRE_ECHO_CLIENT_NAME,
1054         .ldt_ops      = &echo_device_type_ops,
1055         .ldt_ctx_tags = LCT_CL_THREAD | LCT_MD_THREAD | LCT_DT_THREAD,
1056 };
1057 /** @} echo_init */
1058
1059 /** \defgroup echo_exports Exported operations
1060  *
1061  * exporting functions to echo client
1062  *
1063  * @{
1064  */
1065
1066 /* Interfaces to echo client obd device */
1067 static struct echo_object *cl_echo_object_find(struct echo_device *d,
1068                                                struct lov_stripe_md **lsmp)
1069 {
1070         struct lu_env *env;
1071         struct echo_thread_info *info;
1072         struct echo_object_conf *conf;
1073         struct lov_stripe_md    *lsm;
1074         struct echo_object *eco;
1075         struct cl_object   *obj;
1076         struct lu_fid *fid;
1077         int refcheck;
1078         int rc;
1079         ENTRY;
1080
1081         LASSERT(lsmp);
1082         lsm = *lsmp;
1083         LASSERT(lsm);
1084         LASSERTF(ostid_id(&lsm->lsm_oi) != 0, DOSTID"\n", POSTID(&lsm->lsm_oi));
1085         LASSERTF(ostid_seq(&lsm->lsm_oi) == FID_SEQ_ECHO, DOSTID"\n",
1086                  POSTID(&lsm->lsm_oi));
1087
1088         /* Never return an object if the obd is to be freed. */
1089         if (echo_dev2cl(d)->cd_lu_dev.ld_obd->obd_stopping)
1090                 RETURN(ERR_PTR(-ENODEV));
1091
1092         env = cl_env_get(&refcheck);
1093         if (IS_ERR(env))
1094                 RETURN((void *)env);
1095
1096         info = echo_env_info(env);
1097         conf = &info->eti_conf;
1098         if (d->ed_next) {
1099                 if (!d->ed_next_islov) {
1100                         struct lov_oinfo *oinfo = lsm->lsm_oinfo[0];
1101                         LASSERT(oinfo != NULL);
1102                         oinfo->loi_oi = lsm->lsm_oi;
1103                         conf->eoc_cl.u.coc_oinfo = oinfo;
1104                 } else {
1105                         struct lustre_md *md;
1106                         md = &info->eti_md;
1107                         memset(md, 0, sizeof *md);
1108                         md->lsm = lsm;
1109                         conf->eoc_cl.u.coc_md = md;
1110                 }
1111         }
1112         conf->eoc_md = lsmp;
1113
1114         fid  = &info->eti_fid;
1115         rc = ostid_to_fid(fid, &lsm->lsm_oi, 0);
1116         if (rc != 0)
1117                 GOTO(out, eco = ERR_PTR(rc));
1118
1119         /* In the function below, .hs_keycmp resolves to
1120          * lu_obj_hop_keycmp() */
1121         /* coverity[overrun-buffer-val] */
1122         obj = cl_object_find(env, echo_dev2cl(d), fid, &conf->eoc_cl);
1123         if (IS_ERR(obj))
1124                 GOTO(out, eco = (void*)obj);
1125
1126         eco = cl2echo_obj(obj);
1127         if (eco->eo_deleted) {
1128                 cl_object_put(env, obj);
1129                 eco = ERR_PTR(-EAGAIN);
1130         }
1131
1132 out:
1133         cl_env_put(env, &refcheck);
1134         RETURN(eco);
1135 }
1136
1137 static int cl_echo_object_put(struct echo_object *eco)
1138 {
1139         struct lu_env *env;
1140         struct cl_object *obj = echo_obj2cl(eco);
1141         int refcheck;
1142         ENTRY;
1143
1144         env = cl_env_get(&refcheck);
1145         if (IS_ERR(env))
1146                 RETURN(PTR_ERR(env));
1147
1148         /* an external function to kill an object? */
1149         if (eco->eo_deleted) {
1150                 struct lu_object_header *loh = obj->co_lu.lo_header;
1151                 LASSERT(&eco->eo_hdr == luh2coh(loh));
1152                 set_bit(LU_OBJECT_HEARD_BANSHEE, &loh->loh_flags);
1153         }
1154
1155         cl_object_put(env, obj);
1156         cl_env_put(env, &refcheck);
1157         RETURN(0);
1158 }
1159
1160 static int cl_echo_enqueue0(struct lu_env *env, struct echo_object *eco,
1161                             obd_off start, obd_off end, int mode,
1162                             __u64 *cookie , __u32 enqflags)
1163 {
1164         struct cl_io *io;
1165         struct cl_lock *lck;
1166         struct cl_object *obj;
1167         struct cl_lock_descr *descr;
1168         struct echo_thread_info *info;
1169         int rc = -ENOMEM;
1170         ENTRY;
1171
1172         info = echo_env_info(env);
1173         io = &info->eti_io;
1174         descr = &info->eti_descr;
1175         obj = echo_obj2cl(eco);
1176
1177         descr->cld_obj   = obj;
1178         descr->cld_start = cl_index(obj, start);
1179         descr->cld_end   = cl_index(obj, end);
1180         descr->cld_mode  = mode == LCK_PW ? CLM_WRITE : CLM_READ;
1181         descr->cld_enq_flags = enqflags;
1182         io->ci_obj = obj;
1183
1184         lck = cl_lock_request(env, io, descr, "ec enqueue", eco);
1185         if (lck) {
1186                 struct echo_client_obd *ec = eco->eo_dev->ed_ec;
1187                 struct echo_lock *el;
1188
1189                 rc = cl_wait(env, lck);
1190                 if (rc == 0) {
1191                         el = cl2echo_lock(cl_lock_at(lck, &echo_device_type));
1192                         spin_lock(&ec->ec_lock);
1193                         if (list_empty(&el->el_chain)) {
1194                                 list_add(&el->el_chain, &ec->ec_locks);
1195                                 el->el_cookie = ++ec->ec_unique;
1196                         }
1197                         atomic_inc(&el->el_refcount);
1198                         *cookie = el->el_cookie;
1199                         spin_unlock(&ec->ec_lock);
1200                 } else {
1201                         cl_lock_release(env, lck, "ec enqueue", current);
1202                 }
1203         }
1204         RETURN(rc);
1205 }
1206
1207 static int cl_echo_enqueue(struct echo_object *eco, obd_off start, obd_off end,
1208                            int mode, __u64 *cookie)
1209 {
1210         struct echo_thread_info *info;
1211         struct lu_env *env;
1212         struct cl_io *io;
1213         int refcheck;
1214         int result;
1215         ENTRY;
1216
1217         env = cl_env_get(&refcheck);
1218         if (IS_ERR(env))
1219                 RETURN(PTR_ERR(env));
1220
1221         info = echo_env_info(env);
1222         io = &info->eti_io;
1223
1224         io->ci_ignore_layout = 1;
1225         result = cl_io_init(env, io, CIT_MISC, echo_obj2cl(eco));
1226         if (result < 0)
1227                 GOTO(out, result);
1228         LASSERT(result == 0);
1229
1230         result = cl_echo_enqueue0(env, eco, start, end, mode, cookie, 0);
1231         cl_io_fini(env, io);
1232
1233         EXIT;
1234 out:
1235         cl_env_put(env, &refcheck);
1236         return result;
1237 }
1238
1239 static int cl_echo_cancel0(struct lu_env *env, struct echo_device *ed,
1240                            __u64 cookie)
1241 {
1242         struct echo_client_obd *ec = ed->ed_ec;
1243         struct echo_lock       *ecl = NULL;
1244         struct list_head             *el;
1245         int found = 0, still_used = 0;
1246         ENTRY;
1247
1248         LASSERT(ec != NULL);
1249         spin_lock(&ec->ec_lock);
1250         list_for_each (el, &ec->ec_locks) {
1251                 ecl = list_entry (el, struct echo_lock, el_chain);
1252                 CDEBUG(D_INFO, "ecl: %p, cookie: "LPX64"\n", ecl, ecl->el_cookie);
1253                 found = (ecl->el_cookie == cookie);
1254                 if (found) {
1255                         if (atomic_dec_and_test(&ecl->el_refcount))
1256                                 list_del_init(&ecl->el_chain);
1257                         else
1258                                 still_used = 1;
1259                         break;
1260                 }
1261         }
1262         spin_unlock(&ec->ec_lock);
1263
1264         if (!found)
1265                 RETURN(-ENOENT);
1266
1267         echo_lock_release(env, ecl, still_used);
1268         RETURN(0);
1269 }
1270
1271 static int cl_echo_cancel(struct echo_device *ed, __u64 cookie)
1272 {
1273         struct lu_env *env;
1274         int refcheck;
1275         int rc;
1276         ENTRY;
1277
1278         env = cl_env_get(&refcheck);
1279         if (IS_ERR(env))
1280                 RETURN(PTR_ERR(env));
1281
1282         rc = cl_echo_cancel0(env, ed, cookie);
1283
1284         cl_env_put(env, &refcheck);
1285         RETURN(rc);
1286 }
1287
1288 static int cl_echo_async_brw(const struct lu_env *env, struct cl_io *io,
1289                              enum cl_req_type unused, struct cl_2queue *queue)
1290 {
1291         struct cl_page *clp;
1292         struct cl_page *temp;
1293         int result = 0;
1294         ENTRY;
1295
1296         cl_page_list_for_each_safe(clp, temp, &queue->c2_qin) {
1297                 int rc;
1298                 rc = cl_page_cache_add(env, io, clp, CRT_WRITE);
1299                 if (rc == 0)
1300                         continue;
1301                 result = result ?: rc;
1302         }
1303         RETURN(result);
1304 }
1305
1306 static int cl_echo_object_brw(struct echo_object *eco, int rw, obd_off offset,
1307                               struct page **pages, int npages, int async)
1308 {
1309         struct lu_env      *env;
1310         struct echo_thread_info *info;
1311         struct cl_object        *obj = echo_obj2cl(eco);
1312         struct echo_device      *ed  = eco->eo_dev;
1313         struct cl_2queue        *queue;
1314         struct cl_io        *io;
1315         struct cl_page    *clp;
1316         struct lustre_handle    lh = { 0 };
1317         int page_size = cl_page_size(obj);
1318         int refcheck;
1319         int rc;
1320         int i;
1321         ENTRY;
1322
1323         LASSERT((offset & ~CFS_PAGE_MASK) == 0);
1324         LASSERT(ed->ed_next != NULL);
1325         env = cl_env_get(&refcheck);
1326         if (IS_ERR(env))
1327                 RETURN(PTR_ERR(env));
1328
1329         info    = echo_env_info(env);
1330         io      = &info->eti_io;
1331         queue   = &info->eti_queue;
1332
1333         cl_2queue_init(queue);
1334
1335         io->ci_ignore_layout = 1;
1336         rc = cl_io_init(env, io, CIT_MISC, obj);
1337         if (rc < 0)
1338                 GOTO(out, rc);
1339         LASSERT(rc == 0);
1340
1341
1342         rc = cl_echo_enqueue0(env, eco, offset,
1343                               offset + npages * PAGE_CACHE_SIZE - 1,
1344                               rw == READ ? LCK_PR : LCK_PW, &lh.cookie,
1345                               CEF_NEVER);
1346         if (rc < 0)
1347                 GOTO(error_lock, rc);
1348
1349         for (i = 0; i < npages; i++) {
1350                 LASSERT(pages[i]);
1351                 clp = cl_page_find(env, obj, cl_index(obj, offset),
1352                                    pages[i], CPT_TRANSIENT);
1353                 if (IS_ERR(clp)) {
1354                         rc = PTR_ERR(clp);
1355                         break;
1356                 }
1357                 LASSERT(clp->cp_type == CPT_TRANSIENT);
1358
1359                 rc = cl_page_own(env, io, clp);
1360                 if (rc) {
1361                         LASSERT(clp->cp_state == CPS_FREEING);
1362                         cl_page_put(env, clp);
1363                         break;
1364                 }
1365
1366                 cl_2queue_add(queue, clp);
1367
1368                 /* drop the reference count for cl_page_find, so that the page
1369                  * will be freed in cl_2queue_fini. */
1370                 cl_page_put(env, clp);
1371                 cl_page_clip(env, clp, 0, page_size);
1372
1373                 offset += page_size;
1374         }
1375
1376         if (rc == 0) {
1377                 enum cl_req_type typ = rw == READ ? CRT_READ : CRT_WRITE;
1378
1379                 async = async && (typ == CRT_WRITE);
1380                 if (async)
1381                         rc = cl_echo_async_brw(env, io, typ, queue);
1382                 else
1383                         rc = cl_io_submit_sync(env, io, typ, queue, 0);
1384                 CDEBUG(D_INFO, "echo_client %s write returns %d\n",
1385                        async ? "async" : "sync", rc);
1386         }
1387
1388         cl_echo_cancel0(env, ed, lh.cookie);
1389         EXIT;
1390 error_lock:
1391         cl_2queue_discard(env, io, queue);
1392         cl_2queue_disown(env, io, queue);
1393         cl_2queue_fini(env, queue);
1394         cl_io_fini(env, io);
1395 out:
1396         cl_env_put(env, &refcheck);
1397         return rc;
1398 }
1399 /** @} echo_exports */
1400
1401
1402 static obd_id last_object_id;
1403
1404 static int
1405 echo_copyout_lsm (struct lov_stripe_md *lsm, void *_ulsm, int ulsm_nob)
1406 {
1407         struct lov_stripe_md *ulsm = _ulsm;
1408         int nob, i;
1409
1410         nob = offsetof (struct lov_stripe_md, lsm_oinfo[lsm->lsm_stripe_count]);
1411         if (nob > ulsm_nob)
1412                 return (-EINVAL);
1413
1414         if (copy_to_user (ulsm, lsm, sizeof(ulsm)))
1415                 return (-EFAULT);
1416
1417         for (i = 0; i < lsm->lsm_stripe_count; i++) {
1418                 if (copy_to_user (ulsm->lsm_oinfo[i], lsm->lsm_oinfo[i],
1419                                       sizeof(lsm->lsm_oinfo[0])))
1420                         return (-EFAULT);
1421         }
1422         return 0;
1423 }
1424
1425 static int
1426 echo_copyin_lsm (struct echo_device *ed, struct lov_stripe_md *lsm,
1427                  void *ulsm, int ulsm_nob)
1428 {
1429         struct echo_client_obd *ec = ed->ed_ec;
1430         int                  i;
1431
1432         if (ulsm_nob < sizeof (*lsm))
1433                 return (-EINVAL);
1434
1435         if (copy_from_user (lsm, ulsm, sizeof (*lsm)))
1436                 return (-EFAULT);
1437
1438         if (lsm->lsm_stripe_count > ec->ec_nstripes ||
1439             lsm->lsm_magic != LOV_MAGIC ||
1440             (lsm->lsm_stripe_size & (~CFS_PAGE_MASK)) != 0 ||
1441             ((__u64)lsm->lsm_stripe_size * lsm->lsm_stripe_count > ~0UL))
1442                 return (-EINVAL);
1443
1444
1445         for (i = 0; i < lsm->lsm_stripe_count; i++) {
1446                 if (copy_from_user(lsm->lsm_oinfo[i],
1447                                        ((struct lov_stripe_md *)ulsm)-> \
1448                                        lsm_oinfo[i],
1449                                        sizeof(lsm->lsm_oinfo[0])))
1450                         return (-EFAULT);
1451         }
1452         return (0);
1453 }
1454
1455 static inline void echo_md_build_name(struct lu_name *lname, char *name,
1456                                       __u64 id)
1457 {
1458         sprintf(name, LPU64, id);
1459         lname->ln_name = name;
1460         lname->ln_namelen = strlen(name);
1461 }
1462
1463 /* similar to mdt_attr_get_complex */
1464 static int echo_big_lmm_get(const struct lu_env *env, struct md_object *o,
1465                             struct md_attr *ma)
1466 {
1467         struct echo_thread_info *info = echo_env_info(env);
1468         int                      rc;
1469
1470         ENTRY;
1471
1472         LASSERT(ma->ma_lmm_size > 0);
1473
1474         rc = mo_xattr_get(env, o, &LU_BUF_NULL, XATTR_NAME_LOV);
1475         if (rc < 0)
1476                 RETURN(rc);
1477
1478         /* big_lmm may need to be grown */
1479         if (info->eti_big_lmmsize < rc) {
1480                 int size = size_roundup_power2(rc);
1481
1482                 if (info->eti_big_lmmsize > 0) {
1483                         /* free old buffer */
1484                         LASSERT(info->eti_big_lmm);
1485                         OBD_FREE_LARGE(info->eti_big_lmm,
1486                                        info->eti_big_lmmsize);
1487                         info->eti_big_lmm = NULL;
1488                         info->eti_big_lmmsize = 0;
1489                 }
1490
1491                 OBD_ALLOC_LARGE(info->eti_big_lmm, size);
1492                 if (info->eti_big_lmm == NULL)
1493                         RETURN(-ENOMEM);
1494                 info->eti_big_lmmsize = size;
1495         }
1496         LASSERT(info->eti_big_lmmsize >= rc);
1497
1498         info->eti_buf.lb_buf = info->eti_big_lmm;
1499         info->eti_buf.lb_len = info->eti_big_lmmsize;
1500         rc = mo_xattr_get(env, o, &info->eti_buf, XATTR_NAME_LOV);
1501         if (rc < 0)
1502                 RETURN(rc);
1503
1504         ma->ma_valid |= MA_LOV;
1505         ma->ma_lmm = info->eti_big_lmm;
1506         ma->ma_lmm_size = rc;
1507
1508         RETURN(0);
1509 }
1510
1511 int echo_attr_get_complex(const struct lu_env *env, struct md_object *next,
1512                           struct md_attr *ma)
1513 {
1514         struct echo_thread_info *info = echo_env_info(env);
1515         struct lu_buf           *buf = &info->eti_buf;
1516         umode_t          mode = lu_object_attr(&next->mo_lu);
1517         int                      need = ma->ma_need;
1518         int                      rc = 0, rc2;
1519
1520         ENTRY;
1521
1522         ma->ma_valid = 0;
1523
1524         if (need & MA_INODE) {
1525                 ma->ma_need = MA_INODE;
1526                 rc = mo_attr_get(env, next, ma);
1527                 if (rc)
1528                         GOTO(out, rc);
1529                 ma->ma_valid |= MA_INODE;
1530         }
1531
1532         if (need & MA_LOV) {
1533                 if (S_ISREG(mode) || S_ISDIR(mode)) {
1534                         LASSERT(ma->ma_lmm_size > 0);
1535                         buf->lb_buf = ma->ma_lmm;
1536                         buf->lb_len = ma->ma_lmm_size;
1537                         rc2 = mo_xattr_get(env, next, buf, XATTR_NAME_LOV);
1538                         if (rc2 > 0) {
1539                                 ma->ma_lmm_size = rc2;
1540                                 ma->ma_valid |= MA_LOV;
1541                         } else if (rc2 == -ENODATA) {
1542                                 /* no LOV EA */
1543                                 ma->ma_lmm_size = 0;
1544                         } else if (rc2 == -ERANGE) {
1545                                 rc2 = echo_big_lmm_get(env, next, ma);
1546                                 if (rc2 < 0)
1547                                         GOTO(out, rc = rc2);
1548                         } else {
1549                                 GOTO(out, rc = rc2);
1550                         }
1551                 }
1552         }
1553
1554 #ifdef CONFIG_FS_POSIX_ACL
1555         if (need & MA_ACL_DEF && S_ISDIR(mode)) {
1556                 buf->lb_buf = ma->ma_acl;
1557                 buf->lb_len = ma->ma_acl_size;
1558                 rc2 = mo_xattr_get(env, next, buf, XATTR_NAME_ACL_DEFAULT);
1559                 if (rc2 > 0) {
1560                         ma->ma_acl_size = rc2;
1561                         ma->ma_valid |= MA_ACL_DEF;
1562                 } else if (rc2 == -ENODATA) {
1563                         /* no ACLs */
1564                         ma->ma_acl_size = 0;
1565                 } else {
1566                         GOTO(out, rc = rc2);
1567                 }
1568         }
1569 #endif
1570 out:
1571         ma->ma_need = need;
1572         CDEBUG(D_INODE, "after getattr rc = %d, ma_valid = "LPX64" ma_lmm=%p\n",
1573                rc, ma->ma_valid, ma->ma_lmm);
1574         RETURN(rc);
1575 }
1576
1577 static int
1578 echo_md_create_internal(const struct lu_env *env, struct echo_device *ed,
1579                         struct md_object *parent, struct lu_fid *fid,
1580                         struct lu_name *lname, struct md_op_spec *spec,
1581                         struct md_attr *ma)
1582 {
1583         struct lu_object        *ec_child, *child;
1584         struct lu_device        *ld = ed->ed_next;
1585         struct echo_thread_info *info = echo_env_info(env);
1586         struct lu_fid           *fid2 = &info->eti_fid2;
1587         struct lu_object_conf    conf = { .loc_flags = LOC_F_NEW };
1588         int                      rc;
1589
1590         ENTRY;
1591
1592         rc = mdo_lookup(env, parent, lname, fid2, spec);
1593         if (rc == 0)
1594                 return -EEXIST;
1595         else if (rc != -ENOENT)
1596                 return rc;
1597
1598         ec_child = lu_object_find_at(env, &ed->ed_cl.cd_lu_dev,
1599                                      fid, &conf);
1600         if (IS_ERR(ec_child)) {
1601                 CERROR("Can not find the child "DFID": rc = %ld\n", PFID(fid),
1602                         PTR_ERR(ec_child));
1603                 RETURN(PTR_ERR(ec_child));
1604         }
1605
1606         child = lu_object_locate(ec_child->lo_header, ld->ld_type);
1607         if (child == NULL) {
1608                 CERROR("Can not locate the child "DFID"\n", PFID(fid));
1609                 GOTO(out_put, rc = -EINVAL);
1610         }
1611
1612         CDEBUG(D_RPCTRACE, "Start creating object "DFID" %s %p\n",
1613                PFID(lu_object_fid(&parent->mo_lu)), lname->ln_name, parent);
1614
1615         /*
1616          * Do not perform lookup sanity check. We know that name does not exist.
1617          */
1618         spec->sp_cr_lookup = 0;
1619         rc = mdo_create(env, parent, lname, lu2md(child), spec, ma);
1620         if (rc) {
1621                 CERROR("Can not create child "DFID": rc = %d\n", PFID(fid), rc);
1622                 GOTO(out_put, rc);
1623         }
1624         CDEBUG(D_RPCTRACE, "End creating object "DFID" %s %p rc  = %d\n",
1625                PFID(lu_object_fid(&parent->mo_lu)), lname->ln_name, parent, rc);
1626         EXIT;
1627 out_put:
1628         lu_object_put(env, ec_child);
1629         return rc;
1630 }
1631
1632 static int echo_set_lmm_size(const struct lu_env *env, struct lu_device *ld,
1633                              struct md_attr *ma)
1634 {
1635         struct echo_thread_info *info = echo_env_info(env);
1636
1637         if (strcmp(ld->ld_type->ldt_name, LUSTRE_MDD_NAME)) {
1638                 ma->ma_lmm = (void *)&info->eti_lmm;
1639                 ma->ma_lmm_size = sizeof(info->eti_lmm);
1640         } else {
1641                 LASSERT(info->eti_big_lmmsize);
1642                 ma->ma_lmm = info->eti_big_lmm;
1643                 ma->ma_lmm_size = info->eti_big_lmmsize;
1644         }
1645
1646         return 0;
1647 }
1648
1649 static int echo_create_md_object(const struct lu_env *env,
1650                                  struct echo_device *ed,
1651                                  struct lu_object *ec_parent,
1652                                  struct lu_fid *fid,
1653                                  char *name, int namelen,
1654                                  __u64 id, __u32 mode, int count,
1655                                  int stripe_count, int stripe_offset)
1656 {
1657         struct lu_object        *parent;
1658         struct echo_thread_info *info = echo_env_info(env);
1659         struct lu_name    *lname = &info->eti_lname;
1660         struct md_op_spec       *spec = &info->eti_spec;
1661         struct md_attr    *ma = &info->eti_ma;
1662         struct lu_device        *ld = ed->ed_next;
1663         int                   rc = 0;
1664         int                   i;
1665
1666         ENTRY;
1667
1668         if (ec_parent == NULL)
1669                 return -1;
1670         parent = lu_object_locate(ec_parent->lo_header, ld->ld_type);
1671         if (parent == NULL)
1672                 RETURN(-ENXIO);
1673
1674         memset(ma, 0, sizeof(*ma));
1675         memset(spec, 0, sizeof(*spec));
1676         if (stripe_count != 0) {
1677                 spec->sp_cr_flags |= FMODE_WRITE;
1678                 echo_set_lmm_size(env, ld, ma);
1679                 if (stripe_count != -1) {
1680                         struct lov_user_md_v3 *lum = &info->eti_lum;
1681
1682                         lum->lmm_magic = LOV_USER_MAGIC_V3;
1683                         lum->lmm_stripe_count = stripe_count;
1684                         lum->lmm_stripe_offset = stripe_offset;
1685                         lum->lmm_pattern = 0;
1686                         spec->u.sp_ea.eadata = lum;
1687                         spec->u.sp_ea.eadatalen = sizeof(*lum);
1688                         spec->sp_cr_flags |= MDS_OPEN_HAS_EA;
1689                 }
1690         }
1691
1692         ma->ma_attr.la_mode = mode;
1693         ma->ma_attr.la_valid = LA_CTIME | LA_MODE;
1694         ma->ma_attr.la_ctime = cfs_time_current_64();
1695
1696         if (name != NULL) {
1697                 lname->ln_name = name;
1698                 lname->ln_namelen = namelen;
1699                 /* If name is specified, only create one object by name */
1700                 rc = echo_md_create_internal(env, ed, lu2md(parent), fid, lname,
1701                                              spec, ma);
1702                 RETURN(rc);
1703         }
1704
1705         /* Create multiple object sequenced by id */
1706         for (i = 0; i < count; i++) {
1707                 char *tmp_name = info->eti_name;
1708
1709                 echo_md_build_name(lname, tmp_name, id);
1710
1711                 rc = echo_md_create_internal(env, ed, lu2md(parent), fid, lname,
1712                                              spec, ma);
1713                 if (rc) {
1714                         CERROR("Can not create child %s: rc = %d\n", tmp_name,
1715                                 rc);
1716                         break;
1717                 }
1718                 id++;
1719                 fid->f_oid++;
1720         }
1721
1722         RETURN(rc);
1723 }
1724
1725 static struct lu_object *echo_md_lookup(const struct lu_env *env,
1726                                         struct echo_device *ed,
1727                                         struct md_object *parent,
1728                                         struct lu_name *lname)
1729 {
1730         struct echo_thread_info *info = echo_env_info(env);
1731         struct lu_fid      *fid = &info->eti_fid;
1732         struct lu_object        *child;
1733         int    rc;
1734         ENTRY;
1735
1736         CDEBUG(D_INFO, "lookup %s in parent "DFID" %p\n", lname->ln_name,
1737                PFID(fid), parent);
1738         rc = mdo_lookup(env, parent, lname, fid, NULL);
1739         if (rc) {
1740                 CERROR("lookup %s: rc = %d\n", lname->ln_name, rc);
1741                 RETURN(ERR_PTR(rc));
1742         }
1743
1744         /* In the function below, .hs_keycmp resolves to
1745          * lu_obj_hop_keycmp() */
1746         /* coverity[overrun-buffer-val] */
1747         child = lu_object_find_at(env, &ed->ed_cl.cd_lu_dev, fid, NULL);
1748
1749         RETURN(child);
1750 }
1751
1752 static int echo_setattr_object(const struct lu_env *env,
1753                                struct echo_device *ed,
1754                                struct lu_object *ec_parent,
1755                                __u64 id, int count)
1756 {
1757         struct lu_object        *parent;
1758         struct echo_thread_info *info = echo_env_info(env);
1759         struct lu_name    *lname = &info->eti_lname;
1760         char                *name = info->eti_name;
1761         struct lu_device        *ld = ed->ed_next;
1762         struct lu_buf      *buf = &info->eti_buf;
1763         int                   rc = 0;
1764         int                   i;
1765
1766         ENTRY;
1767
1768         if (ec_parent == NULL)
1769                 return -1;
1770         parent = lu_object_locate(ec_parent->lo_header, ld->ld_type);
1771         if (parent == NULL)
1772                 RETURN(-ENXIO);
1773
1774         for (i = 0; i < count; i++) {
1775                 struct lu_object *ec_child, *child;
1776
1777                 echo_md_build_name(lname, name, id);
1778
1779                 ec_child = echo_md_lookup(env, ed, lu2md(parent), lname);
1780                 if (IS_ERR(ec_child)) {
1781                         CERROR("Can't find child %s: rc = %ld\n",
1782                                 lname->ln_name, PTR_ERR(ec_child));
1783                         RETURN(PTR_ERR(ec_child));
1784                 }
1785
1786                 child = lu_object_locate(ec_child->lo_header, ld->ld_type);
1787                 if (child == NULL) {
1788                         CERROR("Can not locate the child %s\n", lname->ln_name);
1789                         lu_object_put(env, ec_child);
1790                         rc = -EINVAL;
1791                         break;
1792                 }
1793
1794                 CDEBUG(D_RPCTRACE, "Start setattr object "DFID"\n",
1795                        PFID(lu_object_fid(child)));
1796
1797                 buf->lb_buf = info->eti_xattr_buf;
1798                 buf->lb_len = sizeof(info->eti_xattr_buf);
1799
1800                 sprintf(name, "%s.test1", XATTR_USER_PREFIX);
1801                 rc = mo_xattr_set(env, lu2md(child), buf, name,
1802                                   LU_XATTR_CREATE);
1803                 if (rc < 0) {
1804                         CERROR("Can not setattr child "DFID": rc = %d\n",
1805                                 PFID(lu_object_fid(child)), rc);
1806                         lu_object_put(env, ec_child);
1807                         break;
1808                 }
1809                 CDEBUG(D_RPCTRACE, "End setattr object "DFID"\n",
1810                        PFID(lu_object_fid(child)));
1811                 id++;
1812                 lu_object_put(env, ec_child);
1813         }
1814         RETURN(rc);
1815 }
1816
1817 static int echo_getattr_object(const struct lu_env *env,
1818                                struct echo_device *ed,
1819                                struct lu_object *ec_parent,
1820                                __u64 id, int count)
1821 {
1822         struct lu_object        *parent;
1823         struct echo_thread_info *info = echo_env_info(env);
1824         struct lu_name    *lname = &info->eti_lname;
1825         char                *name = info->eti_name;
1826         struct md_attr    *ma = &info->eti_ma;
1827         struct lu_device        *ld = ed->ed_next;
1828         int                   rc = 0;
1829         int                   i;
1830
1831         ENTRY;
1832
1833         if (ec_parent == NULL)
1834                 return -1;
1835         parent = lu_object_locate(ec_parent->lo_header, ld->ld_type);
1836         if (parent == NULL)
1837                 RETURN(-ENXIO);
1838
1839         memset(ma, 0, sizeof(*ma));
1840         ma->ma_need |= MA_INODE | MA_LOV | MA_PFID | MA_HSM | MA_ACL_DEF;
1841         ma->ma_acl = info->eti_xattr_buf;
1842         ma->ma_acl_size = sizeof(info->eti_xattr_buf);
1843
1844         for (i = 0; i < count; i++) {
1845                 struct lu_object *ec_child, *child;
1846
1847                 ma->ma_valid = 0;
1848                 echo_md_build_name(lname, name, id);
1849                 echo_set_lmm_size(env, ld, ma);
1850
1851                 ec_child = echo_md_lookup(env, ed, lu2md(parent), lname);
1852                 if (IS_ERR(ec_child)) {
1853                         CERROR("Can't find child %s: rc = %ld\n",
1854                                lname->ln_name, PTR_ERR(ec_child));
1855                         RETURN(PTR_ERR(ec_child));
1856                 }
1857
1858                 child = lu_object_locate(ec_child->lo_header, ld->ld_type);
1859                 if (child == NULL) {
1860                         CERROR("Can not locate the child %s\n", lname->ln_name);
1861                         lu_object_put(env, ec_child);
1862                         RETURN(-EINVAL);
1863                 }
1864
1865                 CDEBUG(D_RPCTRACE, "Start getattr object "DFID"\n",
1866                        PFID(lu_object_fid(child)));
1867                 rc = echo_attr_get_complex(env, lu2md(child), ma);
1868                 if (rc) {
1869                         CERROR("Can not getattr child "DFID": rc = %d\n",
1870                                 PFID(lu_object_fid(child)), rc);
1871                         lu_object_put(env, ec_child);
1872                         break;
1873                 }
1874                 CDEBUG(D_RPCTRACE, "End getattr object "DFID"\n",
1875                        PFID(lu_object_fid(child)));
1876                 id++;
1877                 lu_object_put(env, ec_child);
1878         }
1879
1880         RETURN(rc);
1881 }
1882
1883 static int echo_lookup_object(const struct lu_env *env,
1884                               struct echo_device *ed,
1885                               struct lu_object *ec_parent,
1886                               __u64 id, int count)
1887 {
1888         struct lu_object        *parent;
1889         struct echo_thread_info *info = echo_env_info(env);
1890         struct lu_name    *lname = &info->eti_lname;
1891         char                *name = info->eti_name;
1892         struct lu_fid      *fid = &info->eti_fid;
1893         struct lu_device        *ld = ed->ed_next;
1894         int                   rc = 0;
1895         int                   i;
1896
1897         if (ec_parent == NULL)
1898                 return -1;
1899         parent = lu_object_locate(ec_parent->lo_header, ld->ld_type);
1900         if (parent == NULL)
1901                 return -ENXIO;
1902
1903         /*prepare the requests*/
1904         for (i = 0; i < count; i++) {
1905                 echo_md_build_name(lname, name, id);
1906
1907                 CDEBUG(D_RPCTRACE, "Start lookup object "DFID" %s %p\n",
1908                        PFID(lu_object_fid(parent)), lname->ln_name, parent);
1909
1910                 rc = mdo_lookup(env, lu2md(parent), lname, fid, NULL);
1911                 if (rc) {
1912                         CERROR("Can not lookup child %s: rc = %d\n", name, rc);
1913                         break;
1914                 }
1915                 CDEBUG(D_RPCTRACE, "End lookup object "DFID" %s %p\n",
1916                        PFID(lu_object_fid(parent)), lname->ln_name, parent);
1917
1918                 id++;
1919         }
1920         return rc;
1921 }
1922
1923 static int echo_md_destroy_internal(const struct lu_env *env,
1924                                     struct echo_device *ed,
1925                                     struct md_object *parent,
1926                                     struct lu_name *lname,
1927                                     struct md_attr *ma)
1928 {
1929         struct lu_device   *ld = ed->ed_next;
1930         struct lu_object   *ec_child;
1931         struct lu_object   *child;
1932         int              rc;
1933
1934         ENTRY;
1935
1936         ec_child = echo_md_lookup(env, ed, parent, lname);
1937         if (IS_ERR(ec_child)) {
1938                 CERROR("Can't find child %s: rc = %ld\n", lname->ln_name,
1939                         PTR_ERR(ec_child));
1940                 RETURN(PTR_ERR(ec_child));
1941         }
1942
1943         child = lu_object_locate(ec_child->lo_header, ld->ld_type);
1944         if (child == NULL) {
1945                 CERROR("Can not locate the child %s\n", lname->ln_name);
1946                 GOTO(out_put, rc = -EINVAL);
1947         }
1948
1949         CDEBUG(D_RPCTRACE, "Start destroy object "DFID" %s %p\n",
1950                PFID(lu_object_fid(&parent->mo_lu)), lname->ln_name, parent);
1951
1952         rc = mdo_unlink(env, parent, lu2md(child), lname, ma, 0);
1953         if (rc) {
1954                 CERROR("Can not unlink child %s: rc = %d\n",
1955                         lname->ln_name, rc);
1956                 GOTO(out_put, rc);
1957         }
1958         CDEBUG(D_RPCTRACE, "End destroy object "DFID" %s %p\n",
1959                PFID(lu_object_fid(&parent->mo_lu)), lname->ln_name, parent);
1960 out_put:
1961         lu_object_put(env, ec_child);
1962         return rc;
1963 }
1964
1965 static int echo_destroy_object(const struct lu_env *env,
1966                                struct echo_device *ed,
1967                                struct lu_object *ec_parent,
1968                                char *name, int namelen,
1969                                __u64 id, __u32 mode,
1970                                int count)
1971 {
1972         struct echo_thread_info *info = echo_env_info(env);
1973         struct lu_name    *lname = &info->eti_lname;
1974         struct md_attr    *ma = &info->eti_ma;
1975         struct lu_device        *ld = ed->ed_next;
1976         struct lu_object        *parent;
1977         int                   rc = 0;
1978         int                   i;
1979         ENTRY;
1980
1981         parent = lu_object_locate(ec_parent->lo_header, ld->ld_type);
1982         if (parent == NULL)
1983                 RETURN(-EINVAL);
1984
1985         memset(ma, 0, sizeof(*ma));
1986         ma->ma_attr.la_mode = mode;
1987         ma->ma_attr.la_valid = LA_CTIME;
1988         ma->ma_attr.la_ctime = cfs_time_current_64();
1989         ma->ma_need = MA_INODE;
1990         ma->ma_valid = 0;
1991
1992         if (name != NULL) {
1993                 lname->ln_name = name;
1994                 lname->ln_namelen = namelen;
1995                 rc = echo_md_destroy_internal(env, ed, lu2md(parent), lname,
1996                                               ma);
1997                 RETURN(rc);
1998         }
1999
2000         /*prepare the requests*/
2001         for (i = 0; i < count; i++) {
2002                 char *tmp_name = info->eti_name;
2003
2004                 ma->ma_valid = 0;
2005                 echo_md_build_name(lname, tmp_name, id);
2006
2007                 rc = echo_md_destroy_internal(env, ed, lu2md(parent), lname,
2008                                               ma);
2009                 if (rc) {
2010                         CERROR("Can not unlink child %s: rc = %d\n", name, rc);
2011                         break;
2012                 }
2013                 id++;
2014         }
2015
2016         RETURN(rc);
2017 }
2018
2019 static struct lu_object *echo_resolve_path(const struct lu_env *env,
2020                                            struct echo_device *ed, char *path,
2021                                            int path_len)
2022 {
2023         struct lu_device        *ld = ed->ed_next;
2024         struct md_device        *md = lu2md_dev(ld);
2025         struct echo_thread_info *info = echo_env_info(env);
2026         struct lu_fid      *fid = &info->eti_fid;
2027         struct lu_name    *lname = &info->eti_lname;
2028         struct lu_object        *parent = NULL;
2029         struct lu_object        *child = NULL;
2030         int rc = 0;
2031         ENTRY;
2032
2033         /*Only support MDD layer right now*/
2034         rc = md->md_ops->mdo_root_get(env, md, fid);
2035         if (rc) {
2036                 CERROR("get root error: rc = %d\n", rc);
2037                 RETURN(ERR_PTR(rc));
2038         }
2039
2040         /* In the function below, .hs_keycmp resolves to
2041          * lu_obj_hop_keycmp() */
2042         /* coverity[overrun-buffer-val] */
2043         parent = lu_object_find_at(env, &ed->ed_cl.cd_lu_dev, fid, NULL);
2044         if (IS_ERR(parent)) {
2045                 CERROR("Can not find the parent "DFID": rc = %ld\n",
2046                         PFID(fid), PTR_ERR(parent));
2047                 RETURN(parent);
2048         }
2049
2050         while (1) {
2051                 struct lu_object *ld_parent;
2052                 char *e;
2053
2054                 e = strsep(&path, "/");
2055                 if (e == NULL)
2056                         break;
2057
2058                 if (e[0] == 0) {
2059                         if (!path || path[0] == '\0')
2060                                 break;
2061                         continue;
2062                 }
2063
2064                 lname->ln_name = e;
2065                 lname->ln_namelen = strlen(e);
2066
2067                 ld_parent = lu_object_locate(parent->lo_header, ld->ld_type);
2068                 if (ld_parent == NULL) {
2069                         lu_object_put(env, parent);
2070                         rc = -EINVAL;
2071                         break;
2072                 }
2073
2074                 child = echo_md_lookup(env, ed, lu2md(ld_parent), lname);
2075                 lu_object_put(env, parent);
2076                 if (IS_ERR(child)) {
2077                         rc = (int)PTR_ERR(child);
2078                         CERROR("lookup %s under parent "DFID": rc = %d\n",
2079                                 lname->ln_name, PFID(lu_object_fid(ld_parent)),
2080                                 rc);
2081                         break;
2082                 }
2083                 parent = child;
2084         }
2085         if (rc)
2086                 RETURN(ERR_PTR(rc));
2087
2088         RETURN(parent);
2089 }
2090
2091 static void echo_ucred_init(struct lu_env *env)
2092 {
2093         struct lu_ucred *ucred = lu_ucred(env);
2094
2095         ucred->uc_valid = UCRED_INVALID;
2096
2097         ucred->uc_suppgids[0] = -1;
2098         ucred->uc_suppgids[1] = -1;
2099
2100         ucred->uc_uid   = ucred->uc_o_uid   =
2101                                 from_kuid(&init_user_ns, current_uid());
2102         ucred->uc_gid   = ucred->uc_o_gid   =
2103                                 from_kgid(&init_user_ns, current_gid());
2104         ucred->uc_fsuid = ucred->uc_o_fsuid =
2105                                 from_kuid(&init_user_ns, current_fsuid());
2106         ucred->uc_fsgid = ucred->uc_o_fsgid =
2107                                 from_kgid(&init_user_ns, current_fsgid());
2108         ucred->uc_cap   = cfs_curproc_cap_pack();
2109
2110         /* remove fs privilege for non-root user. */
2111         if (ucred->uc_fsuid)
2112                 ucred->uc_cap &= ~CFS_CAP_FS_MASK;
2113         ucred->uc_valid = UCRED_NEW;
2114 }
2115
2116 static void echo_ucred_fini(struct lu_env *env)
2117 {
2118         struct lu_ucred *ucred = lu_ucred(env);
2119         ucred->uc_valid = UCRED_INIT;
2120 }
2121
2122 #define ECHO_MD_CTX_TAG (LCT_REMEMBER | LCT_MD_THREAD)
2123 #define ECHO_MD_SES_TAG (LCT_REMEMBER | LCT_SESSION)
2124 static int echo_md_handler(struct echo_device *ed, int command,
2125                            char *path, int path_len, __u64 id, int count,
2126                            struct obd_ioctl_data *data)
2127 {
2128         struct echo_thread_info *info;
2129         struct lu_device      *ld = ed->ed_next;
2130         struct lu_env    *env;
2131         int                 refcheck;
2132         struct lu_object      *parent;
2133         char              *name = NULL;
2134         int                 namelen = data->ioc_plen2;
2135         int                 rc = 0;
2136         ENTRY;
2137
2138         if (ld == NULL) {
2139                 CERROR("MD echo client is not being initialized properly\n");
2140                 RETURN(-EINVAL);
2141         }
2142
2143         if (strcmp(ld->ld_type->ldt_name, LUSTRE_MDD_NAME)) {
2144                 CERROR("Only support MDD layer right now!\n");
2145                 RETURN(-EINVAL);
2146         }
2147
2148         env = cl_env_get(&refcheck);
2149         if (IS_ERR(env))
2150                 RETURN(PTR_ERR(env));
2151
2152         rc = lu_env_refill_by_tags(env, ECHO_MD_CTX_TAG, ECHO_MD_SES_TAG);
2153         if (rc != 0)
2154                 GOTO(out_env, rc);
2155
2156         /* init big_lmm buffer */
2157         info = echo_env_info(env);
2158         LASSERT(info->eti_big_lmm == NULL);
2159         OBD_ALLOC_LARGE(info->eti_big_lmm, MIN_MD_SIZE);
2160         if (info->eti_big_lmm == NULL)
2161                 GOTO(out_env, rc = -ENOMEM);
2162         info->eti_big_lmmsize = MIN_MD_SIZE;
2163
2164         parent = echo_resolve_path(env, ed, path, path_len);
2165         if (IS_ERR(parent)) {
2166                 CERROR("Can not resolve the path %s: rc = %ld\n", path,
2167                         PTR_ERR(parent));
2168                 GOTO(out_free, rc = PTR_ERR(parent));
2169         }
2170
2171         if (namelen > 0) {
2172                 OBD_ALLOC(name, namelen + 1);
2173                 if (name == NULL)
2174                         GOTO(out_put, rc = -ENOMEM);
2175                 if (copy_from_user(name, data->ioc_pbuf2, namelen))
2176                         GOTO(out_name, rc = -EFAULT);
2177         }
2178
2179         echo_ucred_init(env);
2180
2181         switch (command) {
2182         case ECHO_MD_CREATE:
2183         case ECHO_MD_MKDIR: {
2184                 struct echo_thread_info *info = echo_env_info(env);
2185                 __u32 mode = data->ioc_obdo2.o_mode;
2186                 struct lu_fid *fid = &info->eti_fid;
2187                 int stripe_count = (int)data->ioc_obdo2.o_misc;
2188                 int stripe_index = (int)data->ioc_obdo2.o_stripe_idx;
2189
2190                 rc = ostid_to_fid(fid, &data->ioc_obdo1.o_oi, 0);
2191                 if (rc != 0)
2192                         break;
2193
2194                 /* In the function below, .hs_keycmp resolves to
2195                  * lu_obj_hop_keycmp() */
2196                 /* coverity[overrun-buffer-val] */
2197                 rc = echo_create_md_object(env, ed, parent, fid, name, namelen,
2198                                            id, mode, count, stripe_count,
2199                                            stripe_index);
2200                 break;
2201         }
2202         case ECHO_MD_DESTROY:
2203         case ECHO_MD_RMDIR: {
2204                 __u32 mode = data->ioc_obdo2.o_mode;
2205
2206                 rc = echo_destroy_object(env, ed, parent, name, namelen,
2207                                          id, mode, count);
2208                 break;
2209         }
2210         case ECHO_MD_LOOKUP:
2211                 rc = echo_lookup_object(env, ed, parent, id, count);
2212                 break;
2213         case ECHO_MD_GETATTR:
2214                 rc = echo_getattr_object(env, ed, parent, id, count);
2215                 break;
2216         case ECHO_MD_SETATTR:
2217                 rc = echo_setattr_object(env, ed, parent, id, count);
2218                 break;
2219         default:
2220                 CERROR("unknown command %d\n", command);
2221                 rc = -EINVAL;
2222                 break;
2223         }
2224         echo_ucred_fini(env);
2225
2226 out_name:
2227         if (name != NULL)
2228                 OBD_FREE(name, namelen + 1);
2229 out_put:
2230         lu_object_put(env, parent);
2231 out_free:
2232         LASSERT(info->eti_big_lmm);
2233         OBD_FREE_LARGE(info->eti_big_lmm, info->eti_big_lmmsize);
2234         info->eti_big_lmm = NULL;
2235         info->eti_big_lmmsize = 0;
2236 out_env:
2237         cl_env_put(env, &refcheck);
2238         return rc;
2239 }
2240
2241 static int echo_create_object(const struct lu_env *env, struct echo_device *ed,
2242                               int on_target, struct obdo *oa, void *ulsm,
2243                               int ulsm_nob, struct obd_trans_info *oti)
2244 {
2245         struct echo_object     *eco;
2246         struct echo_client_obd *ec = ed->ed_ec;
2247         struct lov_stripe_md   *lsm = NULL;
2248         int                  rc;
2249         int                  created = 0;
2250         ENTRY;
2251
2252         if ((oa->o_valid & OBD_MD_FLID) == 0 && /* no obj id */
2253             (on_target ||                      /* set_stripe */
2254              ec->ec_nstripes != 0)) {      /* LOV */
2255                 CERROR ("No valid oid\n");
2256                 RETURN(-EINVAL);
2257         }
2258
2259         rc = echo_alloc_memmd(ed, &lsm);
2260         if (rc < 0) {
2261                 CERROR("Cannot allocate md: rc = %d\n", rc);
2262                 GOTO(failed, rc);
2263         }
2264
2265         if (ulsm != NULL) {
2266                 int i, idx;
2267
2268                 rc = echo_copyin_lsm (ed, lsm, ulsm, ulsm_nob);
2269                 if (rc != 0)
2270                         GOTO(failed, rc);
2271
2272                 if (lsm->lsm_stripe_count == 0)
2273                         lsm->lsm_stripe_count = ec->ec_nstripes;
2274
2275                 if (lsm->lsm_stripe_size == 0)
2276                         lsm->lsm_stripe_size = PAGE_CACHE_SIZE;
2277
2278                 idx = cfs_rand();
2279
2280                 /* setup stripes: indices + default ids if required */
2281                 for (i = 0; i < lsm->lsm_stripe_count; i++) {
2282                         if (ostid_id(&lsm->lsm_oinfo[i]->loi_oi) == 0)
2283                                 lsm->lsm_oinfo[i]->loi_oi = lsm->lsm_oi;
2284
2285                         lsm->lsm_oinfo[i]->loi_ost_idx =
2286                                 (idx + i) % ec->ec_nstripes;
2287                 }
2288         }
2289
2290         /* setup object ID here for !on_target and LOV hint */
2291         if (oa->o_valid & OBD_MD_FLID) {
2292                 LASSERT(oa->o_valid & OBD_MD_FLGROUP);
2293                 lsm->lsm_oi = oa->o_oi;
2294         }
2295
2296         if (ostid_id(&lsm->lsm_oi) == 0)
2297                 ostid_set_id(&lsm->lsm_oi, ++last_object_id);
2298
2299         rc = 0;
2300         if (on_target) {
2301                 /* Only echo objects are allowed to be created */
2302                 LASSERT((oa->o_valid & OBD_MD_FLGROUP) &&
2303                         (ostid_seq(&oa->o_oi) == FID_SEQ_ECHO));
2304                 rc = obd_create(env, ec->ec_exp, oa, &lsm, oti);
2305                 if (rc != 0) {
2306                         CERROR("Cannot create objects: rc = %d\n", rc);
2307                         GOTO(failed, rc);
2308                 }
2309                 created = 1;
2310         }
2311
2312         /* See what object ID we were given */
2313         oa->o_oi = lsm->lsm_oi;
2314         oa->o_valid |= OBD_MD_FLID;
2315
2316         eco = cl_echo_object_find(ed, &lsm);
2317         if (IS_ERR(eco))
2318                 GOTO(failed, rc = PTR_ERR(eco));
2319         cl_echo_object_put(eco);
2320
2321         CDEBUG(D_INFO, "oa oid "DOSTID"\n", POSTID(&oa->o_oi));
2322         EXIT;
2323
2324  failed:
2325         if (created && rc)
2326                 obd_destroy(env, ec->ec_exp, oa, lsm, oti, NULL, NULL);
2327         if (lsm)
2328                 echo_free_memmd(ed, &lsm);
2329         if (rc)
2330                 CERROR("create object failed with: rc = %d\n", rc);
2331         return (rc);
2332 }
2333
2334 static int echo_get_object(struct echo_object **ecop, struct echo_device *ed,
2335                            struct obdo *oa)
2336 {
2337         struct lov_stripe_md   *lsm = NULL;
2338         struct echo_object     *eco;
2339         int                  rc;
2340         ENTRY;
2341
2342         if ((oa->o_valid & OBD_MD_FLID) == 0 || ostid_id(&oa->o_oi) == 0) {
2343                 /* disallow use of object id 0 */
2344                 CERROR ("No valid oid\n");
2345                 RETURN(-EINVAL);
2346         }
2347
2348         rc = echo_alloc_memmd(ed, &lsm);
2349         if (rc < 0)
2350                 RETURN(rc);
2351
2352         lsm->lsm_oi = oa->o_oi;
2353         if (!(oa->o_valid & OBD_MD_FLGROUP))
2354                 ostid_set_seq_echo(&lsm->lsm_oi);
2355
2356         rc = 0;
2357         eco = cl_echo_object_find(ed, &lsm);
2358         if (!IS_ERR(eco))
2359                 *ecop = eco;
2360         else
2361                 rc = PTR_ERR(eco);
2362         if (lsm)
2363                 echo_free_memmd(ed, &lsm);
2364         RETURN(rc);
2365 }
2366
2367 static void echo_put_object(struct echo_object *eco)
2368 {
2369         if (cl_echo_object_put(eco))
2370                 CERROR("echo client: drop an object failed");
2371 }
2372
2373 static void
2374 echo_get_stripe_off_id (struct lov_stripe_md *lsm, obd_off *offp, obd_id *idp)
2375 {
2376         unsigned long stripe_count;
2377         unsigned long stripe_size;
2378         unsigned long width;
2379         unsigned long woffset;
2380         int        stripe_index;
2381         obd_off       offset;
2382
2383         if (lsm->lsm_stripe_count <= 1)
2384                 return;
2385
2386         offset       = *offp;
2387         stripe_size  = lsm->lsm_stripe_size;
2388         stripe_count = lsm->lsm_stripe_count;
2389
2390         /* width = # bytes in all stripes */
2391         width = stripe_size * stripe_count;
2392
2393         /* woffset = offset within a width; offset = whole number of widths */
2394         woffset = do_div (offset, width);
2395
2396         stripe_index = woffset / stripe_size;
2397
2398         *idp = ostid_id(&lsm->lsm_oinfo[stripe_index]->loi_oi);
2399         *offp = offset * stripe_size + woffset % stripe_size;
2400 }
2401
2402 static void
2403 echo_client_page_debug_setup(struct lov_stripe_md *lsm,
2404                              struct page *page, int rw, obd_id id,
2405                              obd_off offset, obd_off count)
2406 {
2407         char    *addr;
2408         obd_off  stripe_off;
2409         obd_id   stripe_id;
2410         int      delta;
2411
2412         /* no partial pages on the client */
2413         LASSERT(count == PAGE_CACHE_SIZE);
2414
2415         addr = kmap(page);
2416
2417         for (delta = 0; delta < PAGE_CACHE_SIZE; delta += OBD_ECHO_BLOCK_SIZE) {
2418                 if (rw == OBD_BRW_WRITE) {
2419                         stripe_off = offset + delta;
2420                         stripe_id = id;
2421                         echo_get_stripe_off_id(lsm, &stripe_off, &stripe_id);
2422                 } else {
2423                         stripe_off = 0xdeadbeef00c0ffeeULL;
2424                         stripe_id = 0xdeadbeef00c0ffeeULL;
2425                 }
2426                 block_debug_setup(addr + delta, OBD_ECHO_BLOCK_SIZE,
2427                                   stripe_off, stripe_id);
2428         }
2429
2430         kunmap(page);
2431 }
2432
2433 static int echo_client_page_debug_check(struct lov_stripe_md *lsm,
2434                                         struct page *page, obd_id id,
2435                                         obd_off offset, obd_off count)
2436 {
2437         obd_off stripe_off;
2438         obd_id  stripe_id;
2439         char   *addr;
2440         int     delta;
2441         int     rc;
2442         int     rc2;
2443
2444         /* no partial pages on the client */
2445         LASSERT(count == PAGE_CACHE_SIZE);
2446
2447         addr = kmap(page);
2448
2449         for (rc = delta = 0; delta < PAGE_CACHE_SIZE; delta += OBD_ECHO_BLOCK_SIZE) {
2450                 stripe_off = offset + delta;
2451                 stripe_id = id;
2452                 echo_get_stripe_off_id (lsm, &stripe_off, &stripe_id);
2453
2454                 rc2 = block_debug_check("test_brw",
2455                                         addr + delta, OBD_ECHO_BLOCK_SIZE,
2456                                         stripe_off, stripe_id);
2457                 if (rc2 != 0) {
2458                         CERROR ("Error in echo object "LPX64"\n", id);
2459                         rc = rc2;
2460                 }
2461         }
2462
2463         kunmap(page);
2464         return rc;
2465 }
2466
2467 static int echo_client_kbrw(struct echo_device *ed, int rw, struct obdo *oa,
2468                             struct echo_object *eco, obd_off offset,
2469                             obd_size count, int async,
2470                             struct obd_trans_info *oti)
2471 {
2472         struct lov_stripe_md   *lsm = eco->eo_lsm;
2473         obd_count              npages;
2474         struct brw_page *pga;
2475         struct brw_page *pgp;
2476         struct page         **pages;
2477         obd_off          off;
2478         int                  i;
2479         int                  rc;
2480         int                  verify;
2481         int                  gfp_mask;
2482         int                  brw_flags = 0;
2483         ENTRY;
2484
2485         verify = (ostid_id(&oa->o_oi) != ECHO_PERSISTENT_OBJID &&
2486                   (oa->o_valid & OBD_MD_FLFLAGS) != 0 &&
2487                   (oa->o_flags & OBD_FL_DEBUG_CHECK) != 0);
2488
2489         gfp_mask = ((ostid_id(&oa->o_oi) & 2) == 0) ? GFP_IOFS : GFP_HIGHUSER;
2490
2491         LASSERT(rw == OBD_BRW_WRITE || rw == OBD_BRW_READ);
2492         LASSERT(lsm != NULL);
2493         LASSERT(ostid_id(&lsm->lsm_oi) == ostid_id(&oa->o_oi));
2494
2495         if (count <= 0 ||
2496             (count & (~CFS_PAGE_MASK)) != 0)
2497                 RETURN(-EINVAL);
2498
2499         /* XXX think again with misaligned I/O */
2500         npages = count >> PAGE_CACHE_SHIFT;
2501
2502         if (rw == OBD_BRW_WRITE)
2503                 brw_flags = OBD_BRW_ASYNC;
2504
2505         OBD_ALLOC(pga, npages * sizeof(*pga));
2506         if (pga == NULL)
2507                 RETURN(-ENOMEM);
2508
2509         OBD_ALLOC(pages, npages * sizeof(*pages));
2510         if (pages == NULL) {
2511                 OBD_FREE(pga, npages * sizeof(*pga));
2512                 RETURN(-ENOMEM);
2513         }
2514
2515         for (i = 0, pgp = pga, off = offset;
2516              i < npages;
2517              i++, pgp++, off += PAGE_CACHE_SIZE) {
2518
2519                 LASSERT (pgp->pg == NULL);      /* for cleanup */
2520
2521                 rc = -ENOMEM;
2522                 OBD_PAGE_ALLOC(pgp->pg, gfp_mask);
2523                 if (pgp->pg == NULL)
2524                         goto out;
2525
2526                 pages[i] = pgp->pg;
2527                 pgp->count = PAGE_CACHE_SIZE;
2528                 pgp->off = off;
2529                 pgp->flag = brw_flags;
2530
2531                 if (verify)
2532                         echo_client_page_debug_setup(lsm, pgp->pg, rw,
2533                                                      ostid_id(&oa->o_oi), off,
2534                                                      pgp->count);
2535         }
2536
2537         /* brw mode can only be used at client */
2538         LASSERT(ed->ed_next != NULL);
2539         rc = cl_echo_object_brw(eco, rw, offset, pages, npages, async);
2540
2541  out:
2542         if (rc != 0 || rw != OBD_BRW_READ)
2543                 verify = 0;
2544
2545         for (i = 0, pgp = pga; i < npages; i++, pgp++) {
2546                 if (pgp->pg == NULL)
2547                         continue;
2548
2549                 if (verify) {
2550                         int vrc;
2551                         vrc = echo_client_page_debug_check(lsm, pgp->pg,
2552                                                            ostid_id(&oa->o_oi),
2553                                                            pgp->off, pgp->count);
2554                         if (vrc != 0 && rc == 0)
2555                                 rc = vrc;
2556                 }
2557                 OBD_PAGE_FREE(pgp->pg);
2558         }
2559         OBD_FREE(pga, npages * sizeof(*pga));
2560         OBD_FREE(pages, npages * sizeof(*pages));
2561         RETURN(rc);
2562 }
2563
2564 static int echo_client_prep_commit(const struct lu_env *env,
2565                                    struct obd_export *exp, int rw,
2566                                    struct obdo *oa, struct echo_object *eco,
2567                                    obd_off offset, obd_size count,
2568                                    obd_size batch, struct obd_trans_info *oti,
2569                                    int async)
2570 {
2571         struct lov_stripe_md *lsm = eco->eo_lsm;
2572         struct obd_ioobj ioo;
2573         struct niobuf_local *lnb;
2574         struct niobuf_remote *rnb;
2575         obd_off off;
2576         obd_size npages, tot_pages;
2577         int i, ret = 0, brw_flags = 0;
2578
2579         ENTRY;
2580
2581         if (count <= 0 || (count & (~CFS_PAGE_MASK)) != 0 ||
2582             (lsm != NULL && ostid_id(&lsm->lsm_oi) != ostid_id(&oa->o_oi)))
2583                 RETURN(-EINVAL);
2584
2585         npages = batch >> PAGE_CACHE_SHIFT;
2586         tot_pages = count >> PAGE_CACHE_SHIFT;
2587
2588         OBD_ALLOC(lnb, npages * sizeof(struct niobuf_local));
2589         OBD_ALLOC(rnb, npages * sizeof(struct niobuf_remote));
2590
2591         if (lnb == NULL || rnb == NULL)
2592                 GOTO(out, ret = -ENOMEM);
2593
2594         if (rw == OBD_BRW_WRITE && async)
2595                 brw_flags |= OBD_BRW_ASYNC;
2596
2597         obdo_to_ioobj(oa, &ioo);
2598
2599         off = offset;
2600
2601         for(; tot_pages; tot_pages -= npages) {
2602                 int lpages;
2603
2604                 if (tot_pages < npages)
2605                         npages = tot_pages;
2606
2607                 for (i = 0; i < npages; i++, off += PAGE_CACHE_SIZE) {
2608                         rnb[i].offset = off;
2609                         rnb[i].len = PAGE_CACHE_SIZE;
2610                         rnb[i].flags = brw_flags;
2611                 }
2612
2613                 ioo.ioo_bufcnt = npages;
2614                 oti->oti_transno = 0;
2615
2616                 lpages = npages;
2617                 ret = obd_preprw(env, rw, exp, oa, 1, &ioo, rnb, &lpages,
2618                                  lnb, oti, NULL);
2619                 if (ret != 0)
2620                         GOTO(out, ret);
2621                 LASSERT(lpages == npages);
2622
2623                 for (i = 0; i < lpages; i++) {
2624                         struct page *page = lnb[i].page;
2625
2626                         /* read past eof? */
2627                         if (page == NULL && lnb[i].rc == 0)
2628                                 continue;
2629
2630                         if (async)
2631                                 lnb[i].flags |= OBD_BRW_ASYNC;
2632
2633                         if (ostid_id(&oa->o_oi) == ECHO_PERSISTENT_OBJID ||
2634                             (oa->o_valid & OBD_MD_FLFLAGS) == 0 ||
2635                             (oa->o_flags & OBD_FL_DEBUG_CHECK) == 0)
2636                                 continue;
2637
2638                         if (rw == OBD_BRW_WRITE)
2639                                 echo_client_page_debug_setup(lsm, page, rw,
2640                                                             ostid_id(&oa->o_oi),
2641                                                              rnb[i].offset,
2642                                                              rnb[i].len);
2643                         else
2644                                 echo_client_page_debug_check(lsm, page,
2645                                                             ostid_id(&oa->o_oi),
2646                                                              rnb[i].offset,
2647                                                              rnb[i].len);
2648                 }
2649
2650                 ret = obd_commitrw(env, rw, exp, oa, 1, &ioo,
2651                                    rnb, npages, lnb, oti, ret);
2652                 if (ret != 0)
2653                         GOTO(out, ret);
2654
2655                 /* Reset oti otherwise it would confuse ldiskfs. */
2656                 memset(oti, 0, sizeof(*oti));
2657
2658                 /* Reuse env context. */
2659                 lu_context_exit((struct lu_context *)&env->le_ctx);
2660                 lu_context_enter((struct lu_context *)&env->le_ctx);
2661         }
2662
2663 out:
2664         if (lnb)
2665                 OBD_FREE(lnb, npages * sizeof(struct niobuf_local));
2666         if (rnb)
2667                 OBD_FREE(rnb, npages * sizeof(struct niobuf_remote));
2668         RETURN(ret);
2669 }
2670
2671 static int echo_client_brw_ioctl(const struct lu_env *env, int rw,
2672                                  struct obd_export *exp,
2673                                  struct obd_ioctl_data *data,
2674                                  struct obd_trans_info *dummy_oti)
2675 {
2676         struct obd_device *obd = class_exp2obd(exp);
2677         struct echo_device *ed = obd2echo_dev(obd);
2678         struct echo_client_obd *ec = ed->ed_ec;
2679         struct obdo *oa = &data->ioc_obdo1;
2680         struct echo_object *eco;
2681         int rc;
2682         int async = 1;
2683         long test_mode;
2684         ENTRY;
2685
2686         LASSERT(oa->o_valid & OBD_MD_FLGROUP);
2687
2688         rc = echo_get_object(&eco, ed, oa);
2689         if (rc)
2690                 RETURN(rc);
2691
2692         oa->o_valid &= ~OBD_MD_FLHANDLE;
2693
2694         /* OFD/obdfilter works only via prep/commit */
2695         test_mode = (long)data->ioc_pbuf1;
2696         if (test_mode == 1)
2697                 async = 0;
2698
2699         if (ed->ed_next == NULL && test_mode != 3) {
2700                 test_mode = 3;
2701                 data->ioc_plen1 = data->ioc_count;
2702         }
2703
2704         /* Truncate batch size to maximum */
2705         if (data->ioc_plen1 > PTLRPC_MAX_BRW_SIZE)
2706                 data->ioc_plen1 = PTLRPC_MAX_BRW_SIZE;
2707
2708         switch (test_mode) {
2709         case 1:
2710                 /* fall through */
2711         case 2:
2712                 rc = echo_client_kbrw(ed, rw, oa,
2713                                       eco, data->ioc_offset,
2714                                       data->ioc_count, async, dummy_oti);
2715                 break;
2716         case 3:
2717                 rc = echo_client_prep_commit(env, ec->ec_exp, rw, oa,
2718                                              eco, data->ioc_offset,
2719                                              data->ioc_count, data->ioc_plen1,
2720                                              dummy_oti, async);
2721                 break;
2722         default:
2723                 rc = -EINVAL;
2724         }
2725         echo_put_object(eco);
2726         RETURN(rc);
2727 }
2728
2729 static int
2730 echo_client_enqueue(struct obd_export *exp, struct obdo *oa,
2731                     int mode, obd_off offset, obd_size nob)
2732 {
2733         struct echo_device     *ed = obd2echo_dev(exp->exp_obd);
2734         struct lustre_handle   *ulh = &oa->o_handle;
2735         struct echo_object     *eco;
2736         obd_off          end;
2737         int                  rc;
2738         ENTRY;
2739
2740         if (ed->ed_next == NULL)
2741                 RETURN(-EOPNOTSUPP);
2742
2743         if (!(mode == LCK_PR || mode == LCK_PW))
2744                 RETURN(-EINVAL);
2745
2746         if ((offset & (~CFS_PAGE_MASK)) != 0 ||
2747             (nob & (~CFS_PAGE_MASK)) != 0)
2748                 RETURN(-EINVAL);
2749
2750         rc = echo_get_object (&eco, ed, oa);
2751         if (rc != 0)
2752                 RETURN(rc);
2753
2754         end = (nob == 0) ? ((obd_off) -1) : (offset + nob - 1);
2755         rc = cl_echo_enqueue(eco, offset, end, mode, &ulh->cookie);
2756         if (rc == 0) {
2757                 oa->o_valid |= OBD_MD_FLHANDLE;
2758                 CDEBUG(D_INFO, "Cookie is "LPX64"\n", ulh->cookie);
2759         }
2760         echo_put_object(eco);
2761         RETURN(rc);
2762 }
2763
2764 static int
2765 echo_client_cancel(struct obd_export *exp, struct obdo *oa)
2766 {
2767         struct echo_device *ed     = obd2echo_dev(exp->exp_obd);
2768         __u64          cookie = oa->o_handle.cookie;
2769
2770         if ((oa->o_valid & OBD_MD_FLHANDLE) == 0)
2771                 return -EINVAL;
2772
2773         CDEBUG(D_INFO, "Cookie is "LPX64"\n", cookie);
2774         return cl_echo_cancel(ed, cookie);
2775 }
2776
2777 static int
2778 echo_client_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
2779                       void *karg, void *uarg)
2780 {
2781         struct obd_device      *obd = exp->exp_obd;
2782         struct echo_device     *ed = obd2echo_dev(obd);
2783         struct echo_client_obd *ec = ed->ed_ec;
2784         struct echo_object     *eco;
2785         struct obd_ioctl_data  *data = karg;
2786         struct obd_trans_info   dummy_oti;
2787         struct lu_env     *env;
2788         struct oti_req_ack_lock *ack_lock;
2789         struct obdo         *oa;
2790         struct lu_fid      fid;
2791         int                  rw = OBD_BRW_READ;
2792         int                  rc = 0;
2793         int                  i;
2794         ENTRY;
2795
2796         memset(&dummy_oti, 0, sizeof(dummy_oti));
2797
2798         oa = &data->ioc_obdo1;
2799         if (!(oa->o_valid & OBD_MD_FLGROUP)) {
2800                 oa->o_valid |= OBD_MD_FLGROUP;
2801                 ostid_set_seq_echo(&oa->o_oi);
2802         }
2803
2804         /* This FID is unpacked just for validation at this point */
2805         rc = ostid_to_fid(&fid, &oa->o_oi, 0);
2806         if (rc < 0)
2807                 RETURN(rc);
2808
2809         OBD_ALLOC_PTR(env);
2810         if (env == NULL)
2811                 RETURN(-ENOMEM);
2812
2813         rc = lu_env_init(env, LCT_DT_THREAD);
2814         if (rc)
2815                 GOTO(out, rc = -ENOMEM);
2816
2817         switch (cmd) {
2818         case OBD_IOC_CREATE:                /* may create echo object */
2819                 if (!cfs_capable(CFS_CAP_SYS_ADMIN))
2820                         GOTO (out, rc = -EPERM);
2821
2822                 rc = echo_create_object(env, ed, 1, oa, data->ioc_pbuf1,
2823                                         data->ioc_plen1, &dummy_oti);
2824                 GOTO(out, rc);
2825
2826         case OBD_IOC_ECHO_MD: {
2827                 int count;
2828                 int cmd;
2829                 char *dir = NULL;
2830                 int dirlen;
2831                 __u64 id;
2832
2833                 if (!cfs_capable(CFS_CAP_SYS_ADMIN))
2834                         GOTO(out, rc = -EPERM);
2835
2836                 count = data->ioc_count;
2837                 cmd = data->ioc_command;
2838
2839                 id = ostid_id(&data->ioc_obdo2.o_oi);
2840
2841                 dirlen = data->ioc_plen1;
2842                 OBD_ALLOC(dir, dirlen + 1);
2843                 if (dir == NULL)
2844                         GOTO(out, rc = -ENOMEM);
2845
2846                 if (copy_from_user(dir, data->ioc_pbuf1, dirlen)) {
2847                         OBD_FREE(dir, data->ioc_plen1 + 1);
2848                         GOTO(out, rc = -EFAULT);
2849                 }
2850
2851                 rc = echo_md_handler(ed, cmd, dir, dirlen, id, count, data);
2852                 OBD_FREE(dir, dirlen + 1);
2853                 GOTO(out, rc);
2854         }
2855         case OBD_IOC_ECHO_ALLOC_SEQ: {
2856                 struct lu_env   *cl_env;
2857                 int           refcheck;
2858                 __u64       seq;
2859                 int           max_count;
2860
2861                 if (!cfs_capable(CFS_CAP_SYS_ADMIN))
2862                         GOTO(out, rc = -EPERM);
2863
2864                 cl_env = cl_env_get(&refcheck);
2865                 if (IS_ERR(cl_env))
2866                         GOTO(out, rc = PTR_ERR(cl_env));
2867
2868                 rc = lu_env_refill_by_tags(cl_env, ECHO_MD_CTX_TAG,
2869                                             ECHO_MD_SES_TAG);
2870                 if (rc != 0) {
2871                         cl_env_put(cl_env, &refcheck);
2872                         GOTO(out, rc);
2873                 }
2874
2875                 rc = seq_client_get_seq(cl_env, ed->ed_cl_seq, &seq);
2876                 cl_env_put(cl_env, &refcheck);
2877                 if (rc < 0) {
2878                         CERROR("%s: Can not alloc seq: rc = %d\n",
2879                                obd->obd_name, rc);
2880                         GOTO(out, rc);
2881                 }
2882
2883                 if (copy_to_user(data->ioc_pbuf1, &seq, data->ioc_plen1))
2884                         return -EFAULT;
2885
2886                 max_count = LUSTRE_METADATA_SEQ_MAX_WIDTH;
2887                 if (copy_to_user(data->ioc_pbuf2, &max_count,
2888                                      data->ioc_plen2))
2889                         return -EFAULT;
2890                 GOTO(out, rc);
2891         }
2892         case OBD_IOC_DESTROY:
2893                 if (!cfs_capable(CFS_CAP_SYS_ADMIN))
2894                         GOTO (out, rc = -EPERM);
2895
2896                 rc = echo_get_object(&eco, ed, oa);
2897                 if (rc == 0) {
2898                         rc = obd_destroy(env, ec->ec_exp, oa, eco->eo_lsm,
2899                                          &dummy_oti, NULL, NULL);
2900                         if (rc == 0)
2901                                 eco->eo_deleted = 1;
2902                         echo_put_object(eco);
2903                 }
2904                 GOTO(out, rc);
2905
2906         case OBD_IOC_GETATTR:
2907                 rc = echo_get_object(&eco, ed, oa);
2908                 if (rc == 0) {
2909                         struct obd_info oinfo = { { { 0 } } };
2910                         oinfo.oi_md = eco->eo_lsm;
2911                         oinfo.oi_oa = oa;
2912                         rc = obd_getattr(env, ec->ec_exp, &oinfo);
2913                         echo_put_object(eco);
2914                 }
2915                 GOTO(out, rc);
2916
2917         case OBD_IOC_SETATTR:
2918                 if (!cfs_capable(CFS_CAP_SYS_ADMIN))
2919                         GOTO (out, rc = -EPERM);
2920
2921                 rc = echo_get_object(&eco, ed, oa);
2922                 if (rc == 0) {
2923                         struct obd_info oinfo = { { { 0 } } };
2924                         oinfo.oi_oa = oa;
2925                         oinfo.oi_md = eco->eo_lsm;
2926
2927                         rc = obd_setattr(env, ec->ec_exp, &oinfo, NULL);
2928                         echo_put_object(eco);
2929                 }
2930                 GOTO(out, rc);
2931
2932         case OBD_IOC_BRW_WRITE:
2933                 if (!cfs_capable(CFS_CAP_SYS_ADMIN))
2934                         GOTO (out, rc = -EPERM);
2935
2936                 rw = OBD_BRW_WRITE;
2937                 /* fall through */
2938         case OBD_IOC_BRW_READ:
2939                 rc = echo_client_brw_ioctl(env, rw, exp, data, &dummy_oti);
2940                 GOTO(out, rc);
2941
2942         case ECHO_IOC_GET_STRIPE:
2943                 rc = echo_get_object(&eco, ed, oa);
2944                 if (rc == 0) {
2945                         rc = echo_copyout_lsm(eco->eo_lsm, data->ioc_pbuf1,
2946                                               data->ioc_plen1);
2947                         echo_put_object(eco);
2948                 }
2949                 GOTO(out, rc);
2950
2951         case ECHO_IOC_SET_STRIPE:
2952                 if (!cfs_capable(CFS_CAP_SYS_ADMIN))
2953                         GOTO (out, rc = -EPERM);
2954
2955                 if (data->ioc_pbuf1 == NULL) {  /* unset */
2956                         rc = echo_get_object(&eco, ed, oa);
2957                         if (rc == 0) {
2958                                 eco->eo_deleted = 1;
2959                                 echo_put_object(eco);
2960                         }
2961                 } else {
2962                         rc = echo_create_object(env, ed, 0, oa,
2963                                                 data->ioc_pbuf1,
2964                                                 data->ioc_plen1, &dummy_oti);
2965                 }
2966                 GOTO (out, rc);
2967
2968         case ECHO_IOC_ENQUEUE:
2969                 if (!cfs_capable(CFS_CAP_SYS_ADMIN))
2970                         GOTO (out, rc = -EPERM);
2971
2972                 rc = echo_client_enqueue(exp, oa,
2973                                          data->ioc_conn1, /* lock mode */
2974                                          data->ioc_offset,
2975                                          data->ioc_count);/*extent*/
2976                 GOTO (out, rc);
2977
2978         case ECHO_IOC_CANCEL:
2979                 rc = echo_client_cancel(exp, oa);
2980                 GOTO (out, rc);
2981
2982         default:
2983                 CERROR ("echo_ioctl(): unrecognised ioctl %#x\n", cmd);
2984                 GOTO (out, rc = -ENOTTY);
2985         }
2986
2987         EXIT;
2988 out:
2989         lu_env_fini(env);
2990         OBD_FREE_PTR(env);
2991
2992         /* XXX this should be in a helper also called by target_send_reply */
2993         for (ack_lock = dummy_oti.oti_ack_locks, i = 0; i < 4;
2994              i++, ack_lock++) {
2995                 if (!ack_lock->mode)
2996                         break;
2997                 ldlm_lock_decref(&ack_lock->lock, ack_lock->mode);
2998         }
2999
3000         return rc;
3001 }
3002
3003 static int echo_client_setup(const struct lu_env *env,
3004                              struct obd_device *obddev, struct lustre_cfg *lcfg)
3005 {
3006         struct echo_client_obd *ec = &obddev->u.echo_client;
3007         struct obd_device *tgt;
3008         struct obd_uuid echo_uuid = { "ECHO_UUID" };
3009         struct obd_connect_data *ocd = NULL;
3010         int rc;
3011         ENTRY;
3012
3013         if (lcfg->lcfg_bufcount < 2 || LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
3014                 CERROR("requires a TARGET OBD name\n");
3015                 RETURN(-EINVAL);
3016         }
3017
3018         tgt = class_name2obd(lustre_cfg_string(lcfg, 1));
3019         if (!tgt || !tgt->obd_attached || !tgt->obd_set_up) {
3020                 CERROR("device not attached or not set up (%s)\n",
3021                        lustre_cfg_string(lcfg, 1));
3022                 RETURN(-EINVAL);
3023         }
3024
3025         spin_lock_init(&ec->ec_lock);
3026         INIT_LIST_HEAD (&ec->ec_objects);
3027         INIT_LIST_HEAD (&ec->ec_locks);
3028         ec->ec_unique = 0;
3029         ec->ec_nstripes = 0;
3030
3031         if (!strcmp(tgt->obd_type->typ_name, LUSTRE_MDT_NAME)) {
3032                 lu_context_tags_update(ECHO_MD_CTX_TAG);
3033                 lu_session_tags_update(ECHO_MD_SES_TAG);
3034                 RETURN(0);
3035         }
3036
3037         OBD_ALLOC(ocd, sizeof(*ocd));
3038         if (ocd == NULL) {
3039                 CERROR("Can't alloc ocd connecting to %s\n",
3040                        lustre_cfg_string(lcfg, 1));
3041                 return -ENOMEM;
3042         }
3043
3044         ocd->ocd_connect_flags = OBD_CONNECT_VERSION | OBD_CONNECT_REQPORTAL |
3045                                  OBD_CONNECT_BRW_SIZE |
3046                                  OBD_CONNECT_GRANT | OBD_CONNECT_FULL20 |
3047                                  OBD_CONNECT_64BITHASH | OBD_CONNECT_LVB_TYPE |
3048                                  OBD_CONNECT_FID;
3049         ocd->ocd_brw_size = DT_MAX_BRW_SIZE;
3050         ocd->ocd_version = LUSTRE_VERSION_CODE;
3051         ocd->ocd_group = FID_SEQ_ECHO;
3052
3053         rc = obd_connect(env, &ec->ec_exp, tgt, &echo_uuid, ocd, NULL);
3054         if (rc == 0) {
3055                 /* Turn off pinger because it connects to tgt obd directly. */
3056                 spin_lock(&tgt->obd_dev_lock);
3057                 list_del_init(&ec->ec_exp->exp_obd_chain_timed);
3058                 spin_unlock(&tgt->obd_dev_lock);
3059         }
3060
3061         OBD_FREE(ocd, sizeof(*ocd));
3062
3063         if (rc != 0) {
3064                 CERROR("fail to connect to device %s\n",
3065                        lustre_cfg_string(lcfg, 1));
3066                 return (rc);
3067         }
3068
3069         RETURN(rc);
3070 }
3071
3072 static int echo_client_cleanup(struct obd_device *obddev)
3073 {
3074         struct echo_device *ed = obd2echo_dev(obddev);
3075         struct echo_client_obd *ec = &obddev->u.echo_client;
3076         int rc;
3077         ENTRY;
3078
3079         /*Do nothing for Metadata echo client*/
3080         if (ed == NULL )
3081                 RETURN(0);
3082
3083         if (ed->ed_next_ismd) {
3084                 lu_context_tags_clear(ECHO_MD_CTX_TAG);
3085                 lu_session_tags_clear(ECHO_MD_SES_TAG);
3086                 RETURN(0);
3087         }
3088
3089         if (!list_empty(&obddev->obd_exports)) {
3090                 CERROR("still has clients!\n");
3091                 RETURN(-EBUSY);
3092         }
3093
3094         LASSERT(atomic_read(&ec->ec_exp->exp_refcount) > 0);
3095         rc = obd_disconnect(ec->ec_exp);
3096         if (rc != 0)
3097                 CERROR("fail to disconnect device: %d\n", rc);
3098
3099         RETURN(rc);
3100 }
3101
3102 static int echo_client_connect(const struct lu_env *env,
3103                                struct obd_export **exp,
3104                                struct obd_device *src, struct obd_uuid *cluuid,
3105                                struct obd_connect_data *data, void *localdata)
3106 {
3107         int             rc;
3108         struct lustre_handle conn = { 0 };
3109
3110         ENTRY;
3111         rc = class_connect(&conn, src, cluuid);
3112         if (rc == 0) {
3113                 *exp = class_conn2export(&conn);
3114         }
3115
3116         RETURN (rc);
3117 }
3118
3119 static int echo_client_disconnect(struct obd_export *exp)
3120 {
3121 #if 0
3122         struct obd_device      *obd;
3123         struct echo_client_obd *ec;
3124         struct ec_lock   *ecl;
3125 #endif
3126         int                  rc;
3127         ENTRY;
3128
3129         if (exp == NULL)
3130                 GOTO(out, rc = -EINVAL);
3131
3132 #if 0
3133         obd = exp->exp_obd;
3134         ec = &obd->u.echo_client;
3135
3136         /* no more contention on export's lock list */
3137         while (!list_empty (&exp->exp_ec_data.eced_locks)) {
3138                 ecl = list_entry (exp->exp_ec_data.eced_locks.next,
3139                                       struct ec_lock, ecl_exp_chain);
3140                 list_del (&ecl->ecl_exp_chain);
3141
3142                 rc = obd_cancel(ec->ec_exp, ecl->ecl_object->eco_lsm,
3143                                  ecl->ecl_mode, &ecl->ecl_lock_handle);
3144
3145                 CDEBUG (D_INFO, "Cancel lock on object "LPX64" on disconnect "
3146                         "(%d)\n", ecl->ecl_object->eco_id, rc);
3147
3148                 echo_put_object (ecl->ecl_object);
3149                 OBD_FREE (ecl, sizeof (*ecl));
3150         }
3151 #endif
3152
3153         rc = class_disconnect(exp);
3154         GOTO(out, rc);
3155  out:
3156         return rc;
3157 }
3158
3159 static struct obd_ops echo_client_obd_ops = {
3160         .o_owner       = THIS_MODULE,
3161
3162 #if 0
3163         .o_setup       = echo_client_setup,
3164         .o_cleanup     = echo_client_cleanup,
3165 #endif
3166
3167         .o_iocontrol   = echo_client_iocontrol,
3168         .o_connect     = echo_client_connect,
3169         .o_disconnect  = echo_client_disconnect
3170 };
3171
3172 int echo_client_init(void)
3173 {
3174         struct lprocfs_static_vars lvars = { 0 };
3175         int rc;
3176
3177         lprocfs_echo_init_vars(&lvars);
3178
3179         rc = lu_kmem_init(echo_caches);
3180         if (rc == 0) {
3181                 rc = class_register_type(&echo_client_obd_ops, NULL,
3182                                          lvars.module_vars,
3183                                          LUSTRE_ECHO_CLIENT_NAME,
3184                                          &echo_device_type);
3185                 if (rc)
3186                         lu_kmem_fini(echo_caches);
3187         }
3188         return rc;
3189 }
3190
3191 void echo_client_exit(void)
3192 {
3193         class_unregister_type(LUSTRE_ECHO_CLIENT_NAME);
3194         lu_kmem_fini(echo_caches);
3195 }
3196
3197 static int __init obdecho_init(void)
3198 {
3199         struct lprocfs_static_vars lvars;
3200         int rc;
3201
3202         ENTRY;
3203         LCONSOLE_INFO("Echo OBD driver; http://www.lustre.org/\n");
3204
3205         LASSERT(PAGE_CACHE_SIZE % OBD_ECHO_BLOCK_SIZE == 0);
3206
3207         lprocfs_echo_init_vars(&lvars);
3208
3209
3210         rc = echo_client_init();
3211
3212         RETURN(rc);
3213 }
3214
3215 static void /*__exit*/ obdecho_exit(void)
3216 {
3217         echo_client_exit();
3218
3219 }
3220
3221 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
3222 MODULE_DESCRIPTION("Lustre Testing Echo OBD driver");
3223 MODULE_LICENSE("GPL");
3224
3225 cfs_module(obdecho, LUSTRE_VERSION_STRING, obdecho_init, obdecho_exit);
3226
3227 /** @} echo_client */