lustre/osc/osc_request.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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  */
  32
  33 #define DEBUG_SUBSYSTEM S_OSC
  34
  35 #include <linux/workqueue.h>
  36 #include <lprocfs_status.h>
  37 #include <lustre_debug.h>
  38 #include <lustre_dlm.h>
  39 #include <lustre_fid.h>
  40 #include <lustre_ha.h>
  41 #include <uapi/linux/lustre/lustre_ioctl.h>
  42 #include <lustre_net.h>
  43 #include <lustre_obdo.h>
  44 #include <uapi/linux/lustre/lustre_param.h>
  45 #include <obd.h>
  46 #include <obd_cksum.h>
  47 #include <obd_class.h>
  48 #include <lustre_osc.h>
  49
  50 #include "osc_internal.h"
  51
  52 atomic_t osc_pool_req_count;
  53 unsigned int osc_reqpool_maxreqcount;
  54 struct ptlrpc_request_pool *osc_rq_pool;
  55
  56 /* max memory used for request pool, unit is MB */
  57 static unsigned int osc_reqpool_mem_max = 5;
  58 module_param(osc_reqpool_mem_max, uint, 0444);
  59
  60 static int osc_idle_timeout = 20;
  61 module_param(osc_idle_timeout, uint, 0644);
  62
  63 #define osc_grant_args osc_brw_async_args
  64
  65 struct osc_setattr_args {
  66         struct obdo             *sa_oa;
  67         obd_enqueue_update_f     sa_upcall;
  68         void                    *sa_cookie;
  69 };
  70
  71 struct osc_fsync_args {
  72         struct osc_object       *fa_obj;
  73         struct obdo             *fa_oa;
  74         obd_enqueue_update_f    fa_upcall;
  75         void                    *fa_cookie;
  76 };
  77
  78 struct osc_ladvise_args {
  79         struct obdo             *la_oa;
  80         obd_enqueue_update_f     la_upcall;
  81         void                    *la_cookie;
  82 };
  83
  84 static void osc_release_ppga(struct brw_page **ppga, size_t count);
  85 static int brw_interpret(const struct lu_env *env, struct ptlrpc_request *req,
  86                          void *data, int rc);
  87
  88 void osc_pack_req_body(struct ptlrpc_request *req, struct obdo *oa)
  89 {
  90         struct ost_body *body;
  91
  92         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
  93         LASSERT(body);
  94
  95         lustre_set_wire_obdo(&req->rq_import->imp_connect_data, &body->oa, oa);
  96 }
  97
  98 static int osc_getattr(const struct lu_env *env, struct obd_export *exp,
  99                        struct obdo *oa)
 100 {
 101         struct ptlrpc_request   *req;
 102         struct ost_body         *body;
 103         int                      rc;
 104
 105         ENTRY;
 106         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_GETATTR);
 107         if (req == NULL)
 108                 RETURN(-ENOMEM);
 109
 110         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GETATTR);
 111         if (rc) {
 112                 ptlrpc_request_free(req);
 113                 RETURN(rc);
 114         }
 115
 116         osc_pack_req_body(req, oa);
 117
 118         ptlrpc_request_set_replen(req);
 119
 120         rc = ptlrpc_queue_wait(req);
 121         if (rc)
 122                 GOTO(out, rc);
 123
 124         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 125         if (body == NULL)
 126                 GOTO(out, rc = -EPROTO);
 127
 128         CDEBUG(D_INODE, "mode: %o\n", body->oa.o_mode);
 129         lustre_get_wire_obdo(&req->rq_import->imp_connect_data, oa, &body->oa);
 130
 131         oa->o_blksize = cli_brw_size(exp->exp_obd);
 132         oa->o_valid |= OBD_MD_FLBLKSZ;
 133
 134         EXIT;
 135 out:
 136         ptlrpc_req_finished(req);
 137
 138         return rc;
 139 }
 140
 141 static int osc_setattr(const struct lu_env *env, struct obd_export *exp,
 142                        struct obdo *oa)
 143 {
 144         struct ptlrpc_request   *req;
 145         struct ost_body         *body;
 146         int                      rc;
 147
 148         ENTRY;
 149         LASSERT(oa->o_valid & OBD_MD_FLGROUP);
 150
 151         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_SETATTR);
 152         if (req == NULL)
 153                 RETURN(-ENOMEM);
 154
 155         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SETATTR);
 156         if (rc) {
 157                 ptlrpc_request_free(req);
 158                 RETURN(rc);
 159         }
 160
 161         osc_pack_req_body(req, oa);
 162
 163         ptlrpc_request_set_replen(req);
 164
 165         rc = ptlrpc_queue_wait(req);
 166         if (rc)
 167                 GOTO(out, rc);
 168
 169         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 170         if (body == NULL)
 171                 GOTO(out, rc = -EPROTO);
 172
 173         lustre_get_wire_obdo(&req->rq_import->imp_connect_data, oa, &body->oa);
 174
 175         EXIT;
 176 out:
 177         ptlrpc_req_finished(req);
 178
 179         RETURN(rc);
 180 }
 181
 182 static int osc_setattr_interpret(const struct lu_env *env,
 183                                  struct ptlrpc_request *req,
 184                                  struct osc_setattr_args *sa, int rc)
 185 {
 186         struct ost_body *body;
 187         ENTRY;
 188
 189         if (rc != 0)
 190                 GOTO(out, rc);
 191
 192         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 193         if (body == NULL)
 194                 GOTO(out, rc = -EPROTO);
 195
 196         lustre_get_wire_obdo(&req->rq_import->imp_connect_data, sa->sa_oa,
 197                              &body->oa);
 198 out:
 199         rc = sa->sa_upcall(sa->sa_cookie, rc);
 200         RETURN(rc);
 201 }
 202
 203 int osc_setattr_async(struct obd_export *exp, struct obdo *oa,
 204                       obd_enqueue_update_f upcall, void *cookie,
 205                       struct ptlrpc_request_set *rqset)
 206 {
 207         struct ptlrpc_request   *req;
 208         struct osc_setattr_args *sa;
 209         int                      rc;
 210
 211         ENTRY;
 212
 213         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_SETATTR);
 214         if (req == NULL)
 215                 RETURN(-ENOMEM);
 216
 217         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SETATTR);
 218         if (rc) {
 219                 ptlrpc_request_free(req);
 220                 RETURN(rc);
 221         }
 222
 223         osc_pack_req_body(req, oa);
 224
 225         ptlrpc_request_set_replen(req);
 226
 227         /* do mds to ost setattr asynchronously */
 228         if (!rqset) {
 229                 /* Do not wait for response. */
 230                 ptlrpcd_add_req(req);
 231         } else {
 232                 req->rq_interpret_reply =
 233                         (ptlrpc_interpterer_t)osc_setattr_interpret;
 234
 235                 CLASSERT(sizeof(*sa) <= sizeof(req->rq_async_args));
 236                 sa = ptlrpc_req_async_args(req);
 237                 sa->sa_oa = oa;
 238                 sa->sa_upcall = upcall;
 239                 sa->sa_cookie = cookie;
 240
 241                 if (rqset == PTLRPCD_SET)
 242                         ptlrpcd_add_req(req);
 243                 else
 244                         ptlrpc_set_add_req(rqset, req);
 245         }
 246
 247         RETURN(0);
 248 }
 249
 250 static int osc_ladvise_interpret(const struct lu_env *env,
 251                                  struct ptlrpc_request *req,
 252                                  void *arg, int rc)
 253 {
 254         struct osc_ladvise_args *la = arg;
 255         struct ost_body *body;
 256         ENTRY;
 257
 258         if (rc != 0)
 259                 GOTO(out, rc);
 260
 261         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 262         if (body == NULL)
 263                 GOTO(out, rc = -EPROTO);
 264
 265         *la->la_oa = body->oa;
 266 out:
 267         rc = la->la_upcall(la->la_cookie, rc);
 268         RETURN(rc);
 269 }
 270
 271 /**
 272  * If rqset is NULL, do not wait for response. Upcall and cookie could also
 273  * be NULL in this case
 274  */
 275 int osc_ladvise_base(struct obd_export *exp, struct obdo *oa,
 276                      struct ladvise_hdr *ladvise_hdr,
 277                      obd_enqueue_update_f upcall, void *cookie,
 278                      struct ptlrpc_request_set *rqset)
 279 {
 280         struct ptlrpc_request   *req;
 281         struct ost_body         *body;
 282         struct osc_ladvise_args *la;
 283         int                      rc;
 284         struct lu_ladvise       *req_ladvise;
 285         struct lu_ladvise       *ladvise = ladvise_hdr->lah_advise;
 286         int                      num_advise = ladvise_hdr->lah_count;
 287         struct ladvise_hdr      *req_ladvise_hdr;
 288         ENTRY;
 289
 290         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_LADVISE);
 291         if (req == NULL)
 292                 RETURN(-ENOMEM);
 293
 294         req_capsule_set_size(&req->rq_pill, &RMF_OST_LADVISE, RCL_CLIENT,
 295                              num_advise * sizeof(*ladvise));
 296         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_LADVISE);
 297         if (rc != 0) {
 298                 ptlrpc_request_free(req);
 299                 RETURN(rc);
 300         }
 301         req->rq_request_portal = OST_IO_PORTAL;
 302         ptlrpc_at_set_req_timeout(req);
 303
 304         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 305         LASSERT(body);
 306         lustre_set_wire_obdo(&req->rq_import->imp_connect_data, &body->oa,
 307                              oa);
 308
 309         req_ladvise_hdr = req_capsule_client_get(&req->rq_pill,
 310                                                  &RMF_OST_LADVISE_HDR);
 311         memcpy(req_ladvise_hdr, ladvise_hdr, sizeof(*ladvise_hdr));
 312
 313         req_ladvise = req_capsule_client_get(&req->rq_pill, &RMF_OST_LADVISE);
 314         memcpy(req_ladvise, ladvise, sizeof(*ladvise) * num_advise);
 315         ptlrpc_request_set_replen(req);
 316
 317         if (rqset == NULL) {
 318                 /* Do not wait for response. */
 319                 ptlrpcd_add_req(req);
 320                 RETURN(0);
 321         }
 322
 323         req->rq_interpret_reply = osc_ladvise_interpret;
 324         CLASSERT(sizeof(*la) <= sizeof(req->rq_async_args));
 325         la = ptlrpc_req_async_args(req);
 326         la->la_oa = oa;
 327         la->la_upcall = upcall;
 328         la->la_cookie = cookie;
 329
 330         if (rqset == PTLRPCD_SET)
 331                 ptlrpcd_add_req(req);
 332         else
 333                 ptlrpc_set_add_req(rqset, req);
 334
 335         RETURN(0);
 336 }
 337
 338 static int osc_create(const struct lu_env *env, struct obd_export *exp,
 339                       struct obdo *oa)
 340 {
 341         struct ptlrpc_request *req;
 342         struct ost_body       *body;
 343         int                    rc;
 344         ENTRY;
 345
 346         LASSERT(oa != NULL);
 347         LASSERT(oa->o_valid & OBD_MD_FLGROUP);
 348         LASSERT(fid_seq_is_echo(ostid_seq(&oa->o_oi)));
 349
 350         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_CREATE);
 351         if (req == NULL)
 352                 GOTO(out, rc = -ENOMEM);
 353
 354         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_CREATE);
 355         if (rc) {
 356                 ptlrpc_request_free(req);
 357                 GOTO(out, rc);
 358         }
 359
 360         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 361         LASSERT(body);
 362
 363         lustre_set_wire_obdo(&req->rq_import->imp_connect_data, &body->oa, oa);
 364
 365         ptlrpc_request_set_replen(req);
 366
 367         rc = ptlrpc_queue_wait(req);
 368         if (rc)
 369                 GOTO(out_req, rc);
 370
 371         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 372         if (body == NULL)
 373                 GOTO(out_req, rc = -EPROTO);
 374
 375         CDEBUG(D_INFO, "oa flags %x\n", oa->o_flags);
 376         lustre_get_wire_obdo(&req->rq_import->imp_connect_data, oa, &body->oa);
 377
 378         oa->o_blksize = cli_brw_size(exp->exp_obd);
 379         oa->o_valid |= OBD_MD_FLBLKSZ;
 380
 381         CDEBUG(D_HA, "transno: %lld\n",
 382                lustre_msg_get_transno(req->rq_repmsg));
 383 out_req:
 384         ptlrpc_req_finished(req);
 385 out:
 386         RETURN(rc);
 387 }
 388
 389 int osc_punch_send(struct obd_export *exp, struct obdo *oa,
 390                    obd_enqueue_update_f upcall, void *cookie)
 391 {
 392         struct ptlrpc_request *req;
 393         struct osc_setattr_args *sa;
 394         struct obd_import *imp = class_exp2cliimp(exp);
 395         struct ost_body *body;
 396         int rc;
 397
 398         ENTRY;
 399
 400         req = ptlrpc_request_alloc(imp, &RQF_OST_PUNCH);
 401         if (req == NULL)
 402                 RETURN(-ENOMEM);
 403
 404         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_PUNCH);
 405         if (rc < 0) {
 406                 ptlrpc_request_free(req);
 407                 RETURN(rc);
 408         }
 409
 410         osc_set_io_portal(req);
 411
 412         ptlrpc_at_set_req_timeout(req);
 413
 414         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 415
 416         lustre_set_wire_obdo(&imp->imp_connect_data, &body->oa, oa);
 417
 418         ptlrpc_request_set_replen(req);
 419
 420         req->rq_interpret_reply = (ptlrpc_interpterer_t)osc_setattr_interpret;
 421         CLASSERT(sizeof(*sa) <= sizeof(req->rq_async_args));
 422         sa = ptlrpc_req_async_args(req);
 423         sa->sa_oa = oa;
 424         sa->sa_upcall = upcall;
 425         sa->sa_cookie = cookie;
 426
 427         ptlrpcd_add_req(req);
 428
 429         RETURN(0);
 430 }
 431 EXPORT_SYMBOL(osc_punch_send);
 432
 433 static int osc_sync_interpret(const struct lu_env *env,
 434                               struct ptlrpc_request *req,
 435                               void *arg, int rc)
 436 {
 437         struct osc_fsync_args   *fa = arg;
 438         struct ost_body         *body;
 439         struct cl_attr          *attr = &osc_env_info(env)->oti_attr;
 440         unsigned long           valid = 0;
 441         struct cl_object        *obj;
 442         ENTRY;
 443
 444         if (rc != 0)
 445                 GOTO(out, rc);
 446
 447         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 448         if (body == NULL) {
 449                 CERROR("can't unpack ost_body\n");
 450                 GOTO(out, rc = -EPROTO);
 451         }
 452
 453         *fa->fa_oa = body->oa;
 454         obj = osc2cl(fa->fa_obj);
 455
 456         /* Update osc object's blocks attribute */
 457         cl_object_attr_lock(obj);
 458         if (body->oa.o_valid & OBD_MD_FLBLOCKS) {
 459                 attr->cat_blocks = body->oa.o_blocks;
 460                 valid |= CAT_BLOCKS;
 461         }
 462
 463         if (valid != 0)
 464                 cl_object_attr_update(env, obj, attr, valid);
 465         cl_object_attr_unlock(obj);
 466
 467 out:
 468         rc = fa->fa_upcall(fa->fa_cookie, rc);
 469         RETURN(rc);
 470 }
 471
 472 int osc_sync_base(struct osc_object *obj, struct obdo *oa,
 473                   obd_enqueue_update_f upcall, void *cookie,
 474                   struct ptlrpc_request_set *rqset)
 475 {
 476         struct obd_export     *exp = osc_export(obj);
 477         struct ptlrpc_request *req;
 478         struct ost_body       *body;
 479         struct osc_fsync_args *fa;
 480         int                    rc;
 481         ENTRY;
 482
 483         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_SYNC);
 484         if (req == NULL)
 485                 RETURN(-ENOMEM);
 486
 487         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SYNC);
 488         if (rc) {
 489                 ptlrpc_request_free(req);
 490                 RETURN(rc);
 491         }
 492
 493         /* overload the size and blocks fields in the oa with start/end */
 494         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 495         LASSERT(body);
 496         lustre_set_wire_obdo(&req->rq_import->imp_connect_data, &body->oa, oa);
 497
 498         ptlrpc_request_set_replen(req);
 499         req->rq_interpret_reply = osc_sync_interpret;
 500
 501         CLASSERT(sizeof(*fa) <= sizeof(req->rq_async_args));
 502         fa = ptlrpc_req_async_args(req);
 503         fa->fa_obj = obj;
 504         fa->fa_oa = oa;
 505         fa->fa_upcall = upcall;
 506         fa->fa_cookie = cookie;
 507
 508         if (rqset == PTLRPCD_SET)
 509                 ptlrpcd_add_req(req);
 510         else
 511                 ptlrpc_set_add_req(rqset, req);
 512
 513         RETURN (0);
 514 }
 515
 516 /* Find and cancel locally locks matched by @mode in the resource found by
 517  * @objid. Found locks are added into @cancel list. Returns the amount of
 518  * locks added to @cancels list. */
 519 static int osc_resource_get_unused(struct obd_export *exp, struct obdo *oa,
 520                                    struct list_head *cancels,
 521                                    enum ldlm_mode mode, __u64 lock_flags)
 522 {
 523         struct ldlm_namespace *ns = exp->exp_obd->obd_namespace;
 524         struct ldlm_res_id res_id;
 525         struct ldlm_resource *res;
 526         int count;
 527         ENTRY;
 528
 529         /* Return, i.e. cancel nothing, only if ELC is supported (flag in
 530          * export) but disabled through procfs (flag in NS).
 531          *
 532          * This distinguishes from a case when ELC is not supported originally,
 533          * when we still want to cancel locks in advance and just cancel them
 534          * locally, without sending any RPC. */
 535         if (exp_connect_cancelset(exp) && !ns_connect_cancelset(ns))
 536                 RETURN(0);
 537
 538         ostid_build_res_name(&oa->o_oi, &res_id);
 539         res = ldlm_resource_get(ns, NULL, &res_id, 0, 0);
 540         if (IS_ERR(res))
 541                 RETURN(0);
 542
 543         LDLM_RESOURCE_ADDREF(res);
 544         count = ldlm_cancel_resource_local(res, cancels, NULL, mode,
 545                                            lock_flags, 0, NULL);
 546         LDLM_RESOURCE_DELREF(res);
 547         ldlm_resource_putref(res);
 548         RETURN(count);
 549 }
 550
 551 static int osc_destroy_interpret(const struct lu_env *env,
 552                                  struct ptlrpc_request *req, void *data,
 553                                  int rc)
 554 {
 555         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
 556
 557         atomic_dec(&cli->cl_destroy_in_flight);
 558         wake_up(&cli->cl_destroy_waitq);
 559         return 0;
 560 }
 561
 562 static int osc_can_send_destroy(struct client_obd *cli)
 563 {
 564         if (atomic_inc_return(&cli->cl_destroy_in_flight) <=
 565             cli->cl_max_rpcs_in_flight) {
 566                 /* The destroy request can be sent */
 567                 return 1;
 568         }
 569         if (atomic_dec_return(&cli->cl_destroy_in_flight) <
 570             cli->cl_max_rpcs_in_flight) {
 571                 /*
 572                  * The counter has been modified between the two atomic
 573                  * operations.
 574                  */
 575                 wake_up(&cli->cl_destroy_waitq);
 576         }
 577         return 0;
 578 }
 579
 580 static int osc_destroy(const struct lu_env *env, struct obd_export *exp,
 581                        struct obdo *oa)
 582 {
 583         struct client_obd     *cli = &exp->exp_obd->u.cli;
 584         struct ptlrpc_request *req;
 585         struct ost_body       *body;
 586         struct list_head       cancels = LIST_HEAD_INIT(cancels);
 587         int rc, count;
 588         ENTRY;
 589
 590         if (!oa) {
 591                 CDEBUG(D_INFO, "oa NULL\n");
 592                 RETURN(-EINVAL);
 593         }
 594
 595         count = osc_resource_get_unused(exp, oa, &cancels, LCK_PW,
 596                                         LDLM_FL_DISCARD_DATA);
 597
 598         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_DESTROY);
 599         if (req == NULL) {
 600                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
 601                 RETURN(-ENOMEM);
 602         }
 603
 604         rc = ldlm_prep_elc_req(exp, req, LUSTRE_OST_VERSION, OST_DESTROY,
 605                                0, &cancels, count);
 606         if (rc) {
 607                 ptlrpc_request_free(req);
 608                 RETURN(rc);
 609         }
 610
 611         req->rq_request_portal = OST_IO_PORTAL; /* bug 7198 */
 612         ptlrpc_at_set_req_timeout(req);
 613
 614         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 615         LASSERT(body);
 616         lustre_set_wire_obdo(&req->rq_import->imp_connect_data, &body->oa, oa);
 617
 618         ptlrpc_request_set_replen(req);
 619
 620         req->rq_interpret_reply = osc_destroy_interpret;
 621         if (!osc_can_send_destroy(cli)) {
 622                 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
 623
 624                 /*
 625                  * Wait until the number of on-going destroy RPCs drops
 626                  * under max_rpc_in_flight
 627                  */
 628                 rc = l_wait_event_exclusive(cli->cl_destroy_waitq,
 629                                             osc_can_send_destroy(cli), &lwi);
 630                 if (rc) {
 631                         ptlrpc_req_finished(req);
 632                         RETURN(rc);
 633                 }
 634         }
 635
 636         /* Do not wait for response */
 637         ptlrpcd_add_req(req);
 638         RETURN(0);
 639 }
 640
 641 static void osc_announce_cached(struct client_obd *cli, struct obdo *oa,
 642                                 long writing_bytes)
 643 {
 644         u64 bits = OBD_MD_FLBLOCKS | OBD_MD_FLGRANT;
 645
 646         LASSERT(!(oa->o_valid & bits));
 647
 648         oa->o_valid |= bits;
 649         spin_lock(&cli->cl_loi_list_lock);
 650         if (OCD_HAS_FLAG(&cli->cl_import->imp_connect_data, GRANT_PARAM))
 651                 oa->o_dirty = cli->cl_dirty_grant;
 652         else
 653                 oa->o_dirty = cli->cl_dirty_pages << PAGE_SHIFT;
 654         if (unlikely(cli->cl_dirty_pages - cli->cl_dirty_transit >
 655                      cli->cl_dirty_max_pages)) {
 656                 CERROR("dirty %lu - %lu > dirty_max %lu\n",
 657                        cli->cl_dirty_pages, cli->cl_dirty_transit,
 658                        cli->cl_dirty_max_pages);
 659                 oa->o_undirty = 0;
 660         } else if (unlikely(atomic_long_read(&obd_dirty_pages) -
 661                             atomic_long_read(&obd_dirty_transit_pages) >
 662                             (long)(obd_max_dirty_pages + 1))) {
 663                 /* The atomic_read() allowing the atomic_inc() are
 664                  * not covered by a lock thus they may safely race and trip
 665                  * this CERROR() unless we add in a small fudge factor (+1). */
 666                 CERROR("%s: dirty %ld - %ld > system dirty_max %ld\n",
 667                        cli_name(cli), atomic_long_read(&obd_dirty_pages),
 668                        atomic_long_read(&obd_dirty_transit_pages),
 669                        obd_max_dirty_pages);
 670                 oa->o_undirty = 0;
 671         } else if (unlikely(cli->cl_dirty_max_pages - cli->cl_dirty_pages >
 672                             0x7fffffff)) {
 673                 CERROR("dirty %lu - dirty_max %lu too big???\n",
 674                        cli->cl_dirty_pages, cli->cl_dirty_max_pages);
 675                 oa->o_undirty = 0;
 676         } else {
 677                 unsigned long nrpages;
 678                 unsigned long undirty;
 679
 680                 nrpages = cli->cl_max_pages_per_rpc;
 681                 nrpages *= cli->cl_max_rpcs_in_flight + 1;
 682                 nrpages = max(nrpages, cli->cl_dirty_max_pages);
 683                 undirty = nrpages << PAGE_SHIFT;
 684                 if (OCD_HAS_FLAG(&cli->cl_import->imp_connect_data,
 685                                  GRANT_PARAM)) {
 686                         int nrextents;
 687
 688                         /* take extent tax into account when asking for more
 689                          * grant space */
 690                         nrextents = (nrpages + cli->cl_max_extent_pages - 1)  /
 691                                      cli->cl_max_extent_pages;
 692                         undirty += nrextents * cli->cl_grant_extent_tax;
 693                 }
 694                 /* Do not ask for more than OBD_MAX_GRANT - a margin for server
 695                  * to add extent tax, etc.
 696                  */
 697                 oa->o_undirty = min(undirty, OBD_MAX_GRANT -
 698                                     (PTLRPC_MAX_BRW_PAGES << PAGE_SHIFT)*4UL);
 699         }
 700         oa->o_grant = cli->cl_avail_grant + cli->cl_reserved_grant;
 701         oa->o_dropped = cli->cl_lost_grant;
 702         cli->cl_lost_grant = 0;
 703         spin_unlock(&cli->cl_loi_list_lock);
 704         CDEBUG(D_CACHE, "dirty: %llu undirty: %u dropped %u grant: %llu\n",
 705                oa->o_dirty, oa->o_undirty, oa->o_dropped, oa->o_grant);
 706 }
 707
 708 void osc_update_next_shrink(struct client_obd *cli)
 709 {
 710         cli->cl_next_shrink_grant = ktime_get_seconds() +
 711                                     cli->cl_grant_shrink_interval;
 712
 713         CDEBUG(D_CACHE, "next time %lld to shrink grant\n",
 714                cli->cl_next_shrink_grant);
 715 }
 716
 717 static void __osc_update_grant(struct client_obd *cli, u64 grant)
 718 {
 719         spin_lock(&cli->cl_loi_list_lock);
 720         cli->cl_avail_grant += grant;
 721         spin_unlock(&cli->cl_loi_list_lock);
 722 }
 723
 724 static void osc_update_grant(struct client_obd *cli, struct ost_body *body)
 725 {
 726         if (body->oa.o_valid & OBD_MD_FLGRANT) {
 727                 CDEBUG(D_CACHE, "got %llu extra grant\n", body->oa.o_grant);
 728                 __osc_update_grant(cli, body->oa.o_grant);
 729         }
 730 }
 731
 732 /**
 733  * grant thread data for shrinking space.
 734  */
 735 struct grant_thread_data {
 736         struct list_head        gtd_clients;
 737         struct mutex            gtd_mutex;
 738         unsigned long           gtd_stopped:1;
 739 };
 740 static struct grant_thread_data client_gtd;
 741
 742 static int osc_shrink_grant_interpret(const struct lu_env *env,
 743                                       struct ptlrpc_request *req,
 744                                       void *aa, int rc)
 745 {
 746         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
 747         struct obdo *oa = ((struct osc_grant_args *)aa)->aa_oa;
 748         struct ost_body *body;
 749
 750         if (rc != 0) {
 751                 __osc_update_grant(cli, oa->o_grant);
 752                 GOTO(out, rc);
 753         }
 754
 755         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 756         LASSERT(body);
 757         osc_update_grant(cli, body);
 758 out:
 759         OBD_SLAB_FREE_PTR(oa, osc_obdo_kmem);
 760         return rc;
 761 }
 762
 763 static void osc_shrink_grant_local(struct client_obd *cli, struct obdo *oa)
 764 {
 765         spin_lock(&cli->cl_loi_list_lock);
 766         oa->o_grant = cli->cl_avail_grant / 4;
 767         cli->cl_avail_grant -= oa->o_grant;
 768         spin_unlock(&cli->cl_loi_list_lock);
 769         if (!(oa->o_valid & OBD_MD_FLFLAGS)) {
 770                 oa->o_valid |= OBD_MD_FLFLAGS;
 771                 oa->o_flags = 0;
 772         }
 773         oa->o_flags |= OBD_FL_SHRINK_GRANT;
 774         osc_update_next_shrink(cli);
 775 }
 776
 777 /* Shrink the current grant, either from some large amount to enough for a
 778  * full set of in-flight RPCs, or if we have already shrunk to that limit
 779  * then to enough for a single RPC.  This avoids keeping more grant than
 780  * needed, and avoids shrinking the grant piecemeal. */
 781 static int osc_shrink_grant(struct client_obd *cli)
 782 {
 783         __u64 target_bytes = (cli->cl_max_rpcs_in_flight + 1) *
 784                              (cli->cl_max_pages_per_rpc << PAGE_SHIFT);
 785
 786         spin_lock(&cli->cl_loi_list_lock);
 787         if (cli->cl_avail_grant <= target_bytes)
 788                 target_bytes = cli->cl_max_pages_per_rpc << PAGE_SHIFT;
 789         spin_unlock(&cli->cl_loi_list_lock);
 790
 791         return osc_shrink_grant_to_target(cli, target_bytes);
 792 }
 793
 794 int osc_shrink_grant_to_target(struct client_obd *cli, __u64 target_bytes)
 795 {
 796         int                     rc = 0;
 797         struct ost_body        *body;
 798         ENTRY;
 799
 800         spin_lock(&cli->cl_loi_list_lock);
 801         /* Don't shrink if we are already above or below the desired limit
 802          * We don't want to shrink below a single RPC, as that will negatively
 803          * impact block allocation and long-term performance. */
 804         if (target_bytes < cli->cl_max_pages_per_rpc << PAGE_SHIFT)
 805                 target_bytes = cli->cl_max_pages_per_rpc << PAGE_SHIFT;
 806
 807         if (target_bytes >= cli->cl_avail_grant) {
 808                 spin_unlock(&cli->cl_loi_list_lock);
 809                 RETURN(0);
 810         }
 811         spin_unlock(&cli->cl_loi_list_lock);
 812
 813         OBD_ALLOC_PTR(body);
 814         if (!body)
 815                 RETURN(-ENOMEM);
 816
 817         osc_announce_cached(cli, &body->oa, 0);
 818
 819         spin_lock(&cli->cl_loi_list_lock);
 820         if (target_bytes >= cli->cl_avail_grant) {
 821                 /* available grant has changed since target calculation */
 822                 spin_unlock(&cli->cl_loi_list_lock);
 823                 GOTO(out_free, rc = 0);
 824         }
 825         body->oa.o_grant = cli->cl_avail_grant - target_bytes;
 826         cli->cl_avail_grant = target_bytes;
 827         spin_unlock(&cli->cl_loi_list_lock);
 828         if (!(body->oa.o_valid & OBD_MD_FLFLAGS)) {
 829                 body->oa.o_valid |= OBD_MD_FLFLAGS;
 830                 body->oa.o_flags = 0;
 831         }
 832         body->oa.o_flags |= OBD_FL_SHRINK_GRANT;
 833         osc_update_next_shrink(cli);
 834
 835         rc = osc_set_info_async(NULL, cli->cl_import->imp_obd->obd_self_export,
 836                                 sizeof(KEY_GRANT_SHRINK), KEY_GRANT_SHRINK,
 837                                 sizeof(*body), body, NULL);
 838         if (rc != 0)
 839                 __osc_update_grant(cli, body->oa.o_grant);
 840 out_free:
 841         OBD_FREE_PTR(body);
 842         RETURN(rc);
 843 }
 844
 845 static int osc_should_shrink_grant(struct client_obd *client)
 846 {
 847         time64_t next_shrink = client->cl_next_shrink_grant;
 848
 849         if (client->cl_import == NULL)
 850                 return 0;
 851
 852         if ((client->cl_import->imp_connect_data.ocd_connect_flags &
 853              OBD_CONNECT_GRANT_SHRINK) == 0)
 854                 return 0;
 855
 856         if (ktime_get_seconds() >= next_shrink - 5) {
 857                 /* Get the current RPC size directly, instead of going via:
 858                  * cli_brw_size(obd->u.cli.cl_import->imp_obd->obd_self_export)
 859                  * Keep comment here so that it can be found by searching. */
 860                 int brw_size = client->cl_max_pages_per_rpc << PAGE_SHIFT;
 861
 862                 if (client->cl_import->imp_state == LUSTRE_IMP_FULL &&
 863                     client->cl_avail_grant > brw_size)
 864                         return 1;
 865                 else
 866                         osc_update_next_shrink(client);
 867         }
 868         return 0;
 869 }
 870
 871 #define GRANT_SHRINK_RPC_BATCH  100
 872
 873 static struct delayed_work work;
 874
 875 static void osc_grant_work_handler(struct work_struct *data)
 876 {
 877         struct client_obd *cli;
 878         int rpc_sent;
 879         bool init_next_shrink = true;
 880         time64_t next_shrink = ktime_get_seconds() + GRANT_SHRINK_INTERVAL;
 881
 882         rpc_sent = 0;
 883         mutex_lock(&client_gtd.gtd_mutex);
 884         list_for_each_entry(cli, &client_gtd.gtd_clients,
 885                             cl_grant_chain) {
 886                 if (++rpc_sent < GRANT_SHRINK_RPC_BATCH &&
 887                     osc_should_shrink_grant(cli))
 888                         osc_shrink_grant(cli);
 889
 890                 if (!init_next_shrink) {
 891                         if (cli->cl_next_shrink_grant < next_shrink &&
 892                             cli->cl_next_shrink_grant > ktime_get_seconds())
 893                                 next_shrink = cli->cl_next_shrink_grant;
 894                 } else {
 895                         init_next_shrink = false;
 896                         next_shrink = cli->cl_next_shrink_grant;
 897                 }
 898         }
 899         mutex_unlock(&client_gtd.gtd_mutex);
 900
 901         if (client_gtd.gtd_stopped == 1)
 902                 return;
 903
 904         if (next_shrink > ktime_get_seconds())
 905                 schedule_delayed_work(&work, msecs_to_jiffies(
 906                                         (next_shrink - ktime_get_seconds()) *
 907                                         MSEC_PER_SEC));
 908         else
 909                 schedule_work(&work.work);
 910 }
 911
 912 /**
 913  * Start grant thread for returing grant to server for idle clients.
 914  */
 915 static int osc_start_grant_work(void)
 916 {
 917         client_gtd.gtd_stopped = 0;
 918         mutex_init(&client_gtd.gtd_mutex);
 919         INIT_LIST_HEAD(&client_gtd.gtd_clients);
 920
 921         INIT_DELAYED_WORK(&work, osc_grant_work_handler);
 922         schedule_work(&work.work);
 923
 924         return 0;
 925 }
 926
 927 static void osc_stop_grant_work(void)
 928 {
 929         client_gtd.gtd_stopped = 1;
 930         cancel_delayed_work_sync(&work);
 931 }
 932
 933 static void osc_add_grant_list(struct client_obd *client)
 934 {
 935         mutex_lock(&client_gtd.gtd_mutex);
 936         list_add(&client->cl_grant_chain, &client_gtd.gtd_clients);
 937         mutex_unlock(&client_gtd.gtd_mutex);
 938 }
 939
 940 static void osc_del_grant_list(struct client_obd *client)
 941 {
 942         if (list_empty(&client->cl_grant_chain))
 943                 return;
 944
 945         mutex_lock(&client_gtd.gtd_mutex);
 946         list_del_init(&client->cl_grant_chain);
 947         mutex_unlock(&client_gtd.gtd_mutex);
 948 }
 949
 950 void osc_init_grant(struct client_obd *cli, struct obd_connect_data *ocd)
 951 {
 952         /*
 953          * ocd_grant is the total grant amount we're expect to hold: if we've
 954          * been evicted, it's the new avail_grant amount, cl_dirty_pages will
 955          * drop to 0 as inflight RPCs fail out; otherwise, it's avail_grant +
 956          * dirty.
 957          *
 958          * race is tolerable here: if we're evicted, but imp_state already
 959          * left EVICTED state, then cl_dirty_pages must be 0 already.
 960          */
 961         spin_lock(&cli->cl_loi_list_lock);
 962         cli->cl_avail_grant = ocd->ocd_grant;
 963         if (cli->cl_import->imp_state != LUSTRE_IMP_EVICTED) {
 964                 cli->cl_avail_grant -= cli->cl_reserved_grant;
 965                 if (OCD_HAS_FLAG(ocd, GRANT_PARAM))
 966                         cli->cl_avail_grant -= cli->cl_dirty_grant;
 967                 else
 968                         cli->cl_avail_grant -=
 969                                         cli->cl_dirty_pages << PAGE_SHIFT;
 970         }
 971
 972         if (OCD_HAS_FLAG(ocd, GRANT_PARAM)) {
 973                 u64 size;
 974                 int chunk_mask;
 975
 976                 /* overhead for each extent insertion */
 977                 cli->cl_grant_extent_tax = ocd->ocd_grant_tax_kb << 10;
 978                 /* determine the appropriate chunk size used by osc_extent. */
 979                 cli->cl_chunkbits = max_t(int, PAGE_SHIFT,
 980                                           ocd->ocd_grant_blkbits);
 981                 /* max_pages_per_rpc must be chunk aligned */
 982                 chunk_mask = ~((1 << (cli->cl_chunkbits - PAGE_SHIFT)) - 1);
 983                 cli->cl_max_pages_per_rpc = (cli->cl_max_pages_per_rpc +
 984                                              ~chunk_mask) & chunk_mask;
 985                 /* determine maximum extent size, in #pages */
 986                 size = (u64)ocd->ocd_grant_max_blks << ocd->ocd_grant_blkbits;
 987                 cli->cl_max_extent_pages = size >> PAGE_SHIFT;
 988                 if (cli->cl_max_extent_pages == 0)
 989                         cli->cl_max_extent_pages = 1;
 990         } else {
 991                 cli->cl_grant_extent_tax = 0;
 992                 cli->cl_chunkbits = PAGE_SHIFT;
 993                 cli->cl_max_extent_pages = DT_MAX_BRW_PAGES;
 994         }
 995         spin_unlock(&cli->cl_loi_list_lock);
 996
 997         CDEBUG(D_CACHE, "%s, setting cl_avail_grant: %ld cl_lost_grant: %ld."
 998                 "chunk bits: %d cl_max_extent_pages: %d\n",
 999                 cli_name(cli),
1000                 cli->cl_avail_grant, cli->cl_lost_grant, cli->cl_chunkbits,
1001                 cli->cl_max_extent_pages);
1002
1003         if (OCD_HAS_FLAG(ocd, GRANT_SHRINK) && list_empty(&cli->cl_grant_chain))
1004                 osc_add_grant_list(cli);
1005 }
1006 EXPORT_SYMBOL(osc_init_grant);
1007
1008 /* We assume that the reason this OSC got a short read is because it read
1009  * beyond the end of a stripe file; i.e. lustre is reading a sparse file
1010  * via the LOV, and it _knows_ it's reading inside the file, it's just that
1011  * this stripe never got written at or beyond this stripe offset yet. */
1012 static void handle_short_read(int nob_read, size_t page_count,
1013                               struct brw_page **pga)
1014 {
1015         char *ptr;
1016         int i = 0;
1017
1018         /* skip bytes read OK */
1019         while (nob_read > 0) {
1020                 LASSERT (page_count > 0);
1021
1022                 if (pga[i]->count > nob_read) {
1023                         /* EOF inside this page */
1024                         ptr = kmap(pga[i]->pg) +
1025                                 (pga[i]->off & ~PAGE_MASK);
1026                         memset(ptr + nob_read, 0, pga[i]->count - nob_read);
1027                         kunmap(pga[i]->pg);
1028                         page_count--;
1029                         i++;
1030                         break;
1031                 }
1032
1033                 nob_read -= pga[i]->count;
1034                 page_count--;
1035                 i++;
1036         }
1037
1038         /* zero remaining pages */
1039         while (page_count-- > 0) {
1040                 ptr = kmap(pga[i]->pg) + (pga[i]->off & ~PAGE_MASK);
1041                 memset(ptr, 0, pga[i]->count);
1042                 kunmap(pga[i]->pg);
1043                 i++;
1044         }
1045 }
1046
1047 static int check_write_rcs(struct ptlrpc_request *req,
1048                            int requested_nob, int niocount,
1049                            size_t page_count, struct brw_page **pga)
1050 {
1051         int     i;
1052         __u32   *remote_rcs;
1053
1054         remote_rcs = req_capsule_server_sized_get(&req->rq_pill, &RMF_RCS,
1055                                                   sizeof(*remote_rcs) *
1056                                                   niocount);
1057         if (remote_rcs == NULL) {
1058                 CDEBUG(D_INFO, "Missing/short RC vector on BRW_WRITE reply\n");
1059                 return(-EPROTO);
1060         }
1061
1062         /* return error if any niobuf was in error */
1063         for (i = 0; i < niocount; i++) {
1064                 if ((int)remote_rcs[i] < 0)
1065                         return(remote_rcs[i]);
1066
1067                 if (remote_rcs[i] != 0) {
1068                         CDEBUG(D_INFO, "rc[%d] invalid (%d) req %p\n",
1069                                 i, remote_rcs[i], req);
1070                         return(-EPROTO);
1071                 }
1072         }
1073         if (req->rq_bulk != NULL &&
1074             req->rq_bulk->bd_nob_transferred != requested_nob) {
1075                 CERROR("Unexpected # bytes transferred: %d (requested %d)\n",
1076                        req->rq_bulk->bd_nob_transferred, requested_nob);
1077                 return(-EPROTO);
1078         }
1079
1080         return (0);
1081 }
1082
1083 static inline int can_merge_pages(struct brw_page *p1, struct brw_page *p2)
1084 {
1085         if (p1->flag != p2->flag) {
1086                 unsigned mask = ~(OBD_BRW_FROM_GRANT | OBD_BRW_NOCACHE |
1087                                   OBD_BRW_SYNC       | OBD_BRW_ASYNC   |
1088                                   OBD_BRW_NOQUOTA    | OBD_BRW_SOFT_SYNC);
1089
1090                 /* warn if we try to combine flags that we don't know to be
1091                  * safe to combine */
1092                 if (unlikely((p1->flag & mask) != (p2->flag & mask))) {
1093                         CWARN("Saw flags 0x%x and 0x%x in the same brw, please "
1094                               "report this at https://jira.whamcloud.com/\n",
1095                               p1->flag, p2->flag);
1096                 }
1097                 return 0;
1098         }
1099
1100         return (p1->off + p1->count == p2->off);
1101 }
1102
1103 static int osc_checksum_bulk_t10pi(const char *obd_name, int nob,
1104                                    size_t pg_count, struct brw_page **pga,
1105                                    int opc, obd_dif_csum_fn *fn,
1106                                    int sector_size,
1107                                    u32 *check_sum)
1108 {
1109         struct ahash_request *req;
1110         /* Used Adler as the default checksum type on top of DIF tags */
1111         unsigned char cfs_alg = cksum_obd2cfs(OBD_CKSUM_T10_TOP);
1112         struct page *__page;
1113         unsigned char *buffer;
1114         __u16 *guard_start;
1115         unsigned int bufsize;
1116         int guard_number;
1117         int used_number = 0;
1118         int used;
1119         u32 cksum;
1120         int rc = 0;
1121         int i = 0;
1122
1123         LASSERT(pg_count > 0);
1124
1125         __page = alloc_page(GFP_KERNEL);
1126         if (__page == NULL)
1127                 return -ENOMEM;
1128
1129         req = cfs_crypto_hash_init(cfs_alg, NULL, 0);
1130         if (IS_ERR(req)) {
1131                 rc = PTR_ERR(req);
1132                 CERROR("%s: unable to initialize checksum hash %s: rc = %d\n",
1133                        obd_name, cfs_crypto_hash_name(cfs_alg), rc);
1134                 GOTO(out, rc);
1135         }
1136
1137         buffer = kmap(__page);
1138         guard_start = (__u16 *)buffer;
1139         guard_number = PAGE_SIZE / sizeof(*guard_start);
1140         while (nob > 0 && pg_count > 0) {
1141                 unsigned int count = pga[i]->count > nob ? nob : pga[i]->count;
1142
1143                 /* corrupt the data before we compute the checksum, to
1144                  * simulate an OST->client data error */
1145                 if (unlikely(i == 0 && opc == OST_READ &&
1146                              OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_RECEIVE))) {
1147                         unsigned char *ptr = kmap(pga[i]->pg);
1148                         int off = pga[i]->off & ~PAGE_MASK;
1149
1150                         memcpy(ptr + off, "bad1", min_t(typeof(nob), 4, nob));
1151                         kunmap(pga[i]->pg);
1152                 }
1153
1154                 /*
1155                  * The left guard number should be able to hold checksums of a
1156                  * whole page
1157                  */
1158                 rc = obd_page_dif_generate_buffer(obd_name, pga[i]->pg, 0,
1159                                                   count,
1160                                                   guard_start + used_number,
1161                                                   guard_number - used_number,
1162                                                   &used, sector_size,
1163                                                   fn);
1164                 if (rc)
1165                         break;
1166
1167                 used_number += used;
1168                 if (used_number == guard_number) {
1169                         cfs_crypto_hash_update_page(req, __page, 0,
1170                                 used_number * sizeof(*guard_start));
1171                         used_number = 0;
1172                 }
1173
1174                 nob -= pga[i]->count;
1175                 pg_count--;
1176                 i++;
1177         }
1178         kunmap(__page);
1179         if (rc)
1180                 GOTO(out, rc);
1181
1182         if (used_number != 0)
1183                 cfs_crypto_hash_update_page(req, __page, 0,
1184                         used_number * sizeof(*guard_start));
1185
1186         bufsize = sizeof(cksum);
1187         cfs_crypto_hash_final(req, (unsigned char *)&cksum, &bufsize);
1188
1189         /* For sending we only compute the wrong checksum instead
1190          * of corrupting the data so it is still correct on a redo */
1191         if (opc == OST_WRITE && OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_SEND))
1192                 cksum++;
1193
1194         *check_sum = cksum;
1195 out:
1196         __free_page(__page);
1197         return rc;
1198 }
1199
1200 static int osc_checksum_bulk(int nob, size_t pg_count,
1201                              struct brw_page **pga, int opc,
1202                              enum cksum_types cksum_type,
1203                              u32 *cksum)
1204 {
1205         int                             i = 0;
1206         struct ahash_request           *req;
1207         unsigned int                    bufsize;
1208         unsigned char                   cfs_alg = cksum_obd2cfs(cksum_type);
1209
1210         LASSERT(pg_count > 0);
1211
1212         req = cfs_crypto_hash_init(cfs_alg, NULL, 0);
1213         if (IS_ERR(req)) {
1214                 CERROR("Unable to initialize checksum hash %s\n",
1215                        cfs_crypto_hash_name(cfs_alg));
1216                 return PTR_ERR(req);
1217         }
1218
1219         while (nob > 0 && pg_count > 0) {
1220                 unsigned int count = pga[i]->count > nob ? nob : pga[i]->count;
1221
1222                 /* corrupt the data before we compute the checksum, to
1223                  * simulate an OST->client data error */
1224                 if (i == 0 && opc == OST_READ &&
1225                     OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_RECEIVE)) {
1226                         unsigned char *ptr = kmap(pga[i]->pg);
1227                         int off = pga[i]->off & ~PAGE_MASK;
1228
1229                         memcpy(ptr + off, "bad1", min_t(typeof(nob), 4, nob));
1230                         kunmap(pga[i]->pg);
1231                 }
1232                 cfs_crypto_hash_update_page(req, pga[i]->pg,
1233                                             pga[i]->off & ~PAGE_MASK,
1234                                             count);
1235                 LL_CDEBUG_PAGE(D_PAGE, pga[i]->pg, "off %d\n",
1236                                (int)(pga[i]->off & ~PAGE_MASK));
1237
1238                 nob -= pga[i]->count;
1239                 pg_count--;
1240                 i++;
1241         }
1242
1243         bufsize = sizeof(*cksum);
1244         cfs_crypto_hash_final(req, (unsigned char *)cksum, &bufsize);
1245
1246         /* For sending we only compute the wrong checksum instead
1247          * of corrupting the data so it is still correct on a redo */
1248         if (opc == OST_WRITE && OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_SEND))
1249                 (*cksum)++;
1250
1251         return 0;
1252 }
1253
1254 static int osc_checksum_bulk_rw(const char *obd_name,
1255                                 enum cksum_types cksum_type,
1256                                 int nob, size_t pg_count,
1257                                 struct brw_page **pga, int opc,
1258                                 u32 *check_sum)
1259 {
1260         obd_dif_csum_fn *fn = NULL;
1261         int sector_size = 0;
1262         int rc;
1263
1264         ENTRY;
1265         obd_t10_cksum2dif(cksum_type, &fn, &sector_size);
1266
1267         if (fn)
1268                 rc = osc_checksum_bulk_t10pi(obd_name, nob, pg_count, pga,
1269                                              opc, fn, sector_size, check_sum);
1270         else
1271                 rc = osc_checksum_bulk(nob, pg_count, pga, opc, cksum_type,
1272                                        check_sum);
1273
1274         RETURN(rc);
1275 }
1276
1277 static int
1278 osc_brw_prep_request(int cmd, struct client_obd *cli, struct obdo *oa,
1279                      u32 page_count, struct brw_page **pga,
1280                      struct ptlrpc_request **reqp, int resend)
1281 {
1282         struct ptlrpc_request   *req;
1283         struct ptlrpc_bulk_desc *desc;
1284         struct ost_body         *body;
1285         struct obd_ioobj        *ioobj;
1286         struct niobuf_remote    *niobuf;
1287         int niocount, i, requested_nob, opc, rc, short_io_size = 0;
1288         struct osc_brw_async_args *aa;
1289         struct req_capsule      *pill;
1290         struct brw_page *pg_prev;
1291         void *short_io_buf;
1292         const char *obd_name = cli->cl_import->imp_obd->obd_name;
1293
1294         ENTRY;
1295         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_BRW_PREP_REQ))
1296                 RETURN(-ENOMEM); /* Recoverable */
1297         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_BRW_PREP_REQ2))
1298                 RETURN(-EINVAL); /* Fatal */
1299
1300         if ((cmd & OBD_BRW_WRITE) != 0) {
1301                 opc = OST_WRITE;
1302                 req = ptlrpc_request_alloc_pool(cli->cl_import,
1303                                                 osc_rq_pool,
1304                                                 &RQF_OST_BRW_WRITE);
1305         } else {
1306                 opc = OST_READ;
1307                 req = ptlrpc_request_alloc(cli->cl_import, &RQF_OST_BRW_READ);
1308         }
1309         if (req == NULL)
1310                 RETURN(-ENOMEM);
1311
1312         for (niocount = i = 1; i < page_count; i++) {
1313                 if (!can_merge_pages(pga[i - 1], pga[i]))
1314                         niocount++;
1315         }
1316
1317         pill = &req->rq_pill;
1318         req_capsule_set_size(pill, &RMF_OBD_IOOBJ, RCL_CLIENT,
1319                              sizeof(*ioobj));
1320         req_capsule_set_size(pill, &RMF_NIOBUF_REMOTE, RCL_CLIENT,
1321                              niocount * sizeof(*niobuf));
1322
1323         for (i = 0; i < page_count; i++)
1324                 short_io_size += pga[i]->count;
1325
1326         /* Check if read/write is small enough to be a short io. */
1327         if (short_io_size > cli->cl_max_short_io_bytes || niocount > 1 ||
1328             !imp_connect_shortio(cli->cl_import))
1329                 short_io_size = 0;
1330
1331         req_capsule_set_size(pill, &RMF_SHORT_IO, RCL_CLIENT,
1332                              opc == OST_READ ? 0 : short_io_size);
1333         if (opc == OST_READ)
1334                 req_capsule_set_size(pill, &RMF_SHORT_IO, RCL_SERVER,
1335                                      short_io_size);
1336
1337         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, opc);
1338         if (rc) {
1339                 ptlrpc_request_free(req);
1340                 RETURN(rc);
1341         }
1342         osc_set_io_portal(req);
1343
1344         ptlrpc_at_set_req_timeout(req);
1345         /* ask ptlrpc not to resend on EINPROGRESS since BRWs have their own
1346          * retry logic */
1347         req->rq_no_retry_einprogress = 1;
1348
1349         if (short_io_size != 0) {
1350                 desc = NULL;
1351                 short_io_buf = NULL;
1352                 goto no_bulk;
1353         }
1354
1355         desc = ptlrpc_prep_bulk_imp(req, page_count,
1356                 cli->cl_import->imp_connect_data.ocd_brw_size >> LNET_MTU_BITS,
1357                 (opc == OST_WRITE ? PTLRPC_BULK_GET_SOURCE :
1358                         PTLRPC_BULK_PUT_SINK) |
1359                         PTLRPC_BULK_BUF_KIOV,
1360                 OST_BULK_PORTAL,
1361                 &ptlrpc_bulk_kiov_pin_ops);
1362
1363         if (desc == NULL)
1364                 GOTO(out, rc = -ENOMEM);
1365         /* NB request now owns desc and will free it when it gets freed */
1366 no_bulk:
1367         body = req_capsule_client_get(pill, &RMF_OST_BODY);
1368         ioobj = req_capsule_client_get(pill, &RMF_OBD_IOOBJ);
1369         niobuf = req_capsule_client_get(pill, &RMF_NIOBUF_REMOTE);
1370         LASSERT(body != NULL && ioobj != NULL && niobuf != NULL);
1371
1372         lustre_set_wire_obdo(&req->rq_import->imp_connect_data, &body->oa, oa);
1373
1374         /* For READ and WRITE, we can't fill o_uid and o_gid using from_kuid()
1375          * and from_kgid(), because they are asynchronous. Fortunately, variable
1376          * oa contains valid o_uid and o_gid in these two operations.
1377          * Besides, filling o_uid and o_gid is enough for nrs-tbf, see LU-9658.
1378          * OBD_MD_FLUID and OBD_MD_FLUID is not set in order to avoid breaking
1379          * other process logic */
1380         body->oa.o_uid = oa->o_uid;
1381         body->oa.o_gid = oa->o_gid;
1382
1383         obdo_to_ioobj(oa, ioobj);
1384         ioobj->ioo_bufcnt = niocount;
1385         /* The high bits of ioo_max_brw tells server _maximum_ number of bulks
1386          * that might be send for this request.  The actual number is decided
1387          * when the RPC is finally sent in ptlrpc_register_bulk(). It sends
1388          * "max - 1" for old client compatibility sending "0", and also so the
1389          * the actual maximum is a power-of-two number, not one less. LU-1431 */
1390         if (desc != NULL)
1391                 ioobj_max_brw_set(ioobj, desc->bd_md_max_brw);
1392         else /* short io */
1393                 ioobj_max_brw_set(ioobj, 0);
1394
1395         if (short_io_size != 0) {
1396                 if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0) {
1397                         body->oa.o_valid |= OBD_MD_FLFLAGS;
1398                         body->oa.o_flags = 0;
1399                 }
1400                 body->oa.o_flags |= OBD_FL_SHORT_IO;
1401                 CDEBUG(D_CACHE, "Using short io for data transfer, size = %d\n",
1402                        short_io_size);
1403                 if (opc == OST_WRITE) {
1404                         short_io_buf = req_capsule_client_get(pill,
1405                                                               &RMF_SHORT_IO);
1406                         LASSERT(short_io_buf != NULL);
1407                 }
1408         }
1409
1410         LASSERT(page_count > 0);
1411         pg_prev = pga[0];
1412         for (requested_nob = i = 0; i < page_count; i++, niobuf++) {
1413                 struct brw_page *pg = pga[i];
1414                 int poff = pg->off & ~PAGE_MASK;
1415
1416                 LASSERT(pg->count > 0);
1417                 /* make sure there is no gap in the middle of page array */
1418                 LASSERTF(page_count == 1 ||
1419                          (ergo(i == 0, poff + pg->count == PAGE_SIZE) &&
1420                           ergo(i > 0 && i < page_count - 1,
1421                                poff == 0 && pg->count == PAGE_SIZE)   &&
1422                           ergo(i == page_count - 1, poff == 0)),
1423                          "i: %d/%d pg: %p off: %llu, count: %u\n",
1424                          i, page_count, pg, pg->off, pg->count);
1425                 LASSERTF(i == 0 || pg->off > pg_prev->off,
1426                          "i %d p_c %u pg %p [pri %lu ind %lu] off %llu"
1427                          " prev_pg %p [pri %lu ind %lu] off %llu\n",
1428                          i, page_count,
1429                          pg->pg, page_private(pg->pg), pg->pg->index, pg->off,
1430                          pg_prev->pg, page_private(pg_prev->pg),
1431                          pg_prev->pg->index, pg_prev->off);
1432                 LASSERT((pga[0]->flag & OBD_BRW_SRVLOCK) ==
1433                         (pg->flag & OBD_BRW_SRVLOCK));
1434                 if (short_io_size != 0 && opc == OST_WRITE) {
1435                         unsigned char *ptr = ll_kmap_atomic(pg->pg, KM_USER0);
1436
1437                         LASSERT(short_io_size >= requested_nob + pg->count);
1438                         memcpy(short_io_buf + requested_nob,
1439                                ptr + poff,
1440                                pg->count);
1441                         ll_kunmap_atomic(ptr, KM_USER0);
1442                 } else if (short_io_size == 0) {
1443                         desc->bd_frag_ops->add_kiov_frag(desc, pg->pg, poff,
1444                                                          pg->count);
1445                 }
1446                 requested_nob += pg->count;
1447
1448                 if (i > 0 && can_merge_pages(pg_prev, pg)) {
1449                         niobuf--;
1450                         niobuf->rnb_len += pg->count;
1451                 } else {
1452                         niobuf->rnb_offset = pg->off;
1453                         niobuf->rnb_len    = pg->count;
1454                         niobuf->rnb_flags  = pg->flag;
1455                 }
1456                 pg_prev = pg;
1457         }
1458
1459         LASSERTF((void *)(niobuf - niocount) ==
1460                 req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE),
1461                 "want %p - real %p\n", req_capsule_client_get(&req->rq_pill,
1462                 &RMF_NIOBUF_REMOTE), (void *)(niobuf - niocount));
1463
1464         osc_announce_cached(cli, &body->oa, opc == OST_WRITE ? requested_nob:0);
1465         if (resend) {
1466                 if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0) {
1467                         body->oa.o_valid |= OBD_MD_FLFLAGS;
1468                         body->oa.o_flags = 0;
1469                 }
1470                 body->oa.o_flags |= OBD_FL_RECOV_RESEND;
1471         }
1472
1473         if (osc_should_shrink_grant(cli))
1474                 osc_shrink_grant_local(cli, &body->oa);
1475
1476         /* size[REQ_REC_OFF] still sizeof (*body) */
1477         if (opc == OST_WRITE) {
1478                 if (cli->cl_checksum &&
1479                     !sptlrpc_flavor_has_bulk(&req->rq_flvr)) {
1480                         /* store cl_cksum_type in a local variable since
1481                          * it can be changed via lprocfs */
1482                         enum cksum_types cksum_type = cli->cl_cksum_type;
1483
1484                         if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0)
1485                                 body->oa.o_flags = 0;
1486
1487                         body->oa.o_flags |= obd_cksum_type_pack(obd_name,
1488                                                                 cksum_type);
1489                         body->oa.o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1490
1491                         rc = osc_checksum_bulk_rw(obd_name, cksum_type,
1492                                                   requested_nob, page_count,
1493                                                   pga, OST_WRITE,
1494                                                   &body->oa.o_cksum);
1495                         if (rc < 0) {
1496                                 CDEBUG(D_PAGE, "failed to checksum, rc = %d\n",
1497                                        rc);
1498                                 GOTO(out, rc);
1499                         }
1500                         CDEBUG(D_PAGE, "checksum at write origin: %x\n",
1501                                body->oa.o_cksum);
1502
1503                         /* save this in 'oa', too, for later checking */
1504                         oa->o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1505                         oa->o_flags |= obd_cksum_type_pack(obd_name,
1506                                                            cksum_type);
1507                 } else {
1508                         /* clear out the checksum flag, in case this is a
1509                          * resend but cl_checksum is no longer set. b=11238 */
1510                         oa->o_valid &= ~OBD_MD_FLCKSUM;
1511                 }
1512                 oa->o_cksum = body->oa.o_cksum;
1513                 /* 1 RC per niobuf */
1514                 req_capsule_set_size(pill, &RMF_RCS, RCL_SERVER,
1515                                      sizeof(__u32) * niocount);
1516         } else {
1517                 if (cli->cl_checksum &&
1518                     !sptlrpc_flavor_has_bulk(&req->rq_flvr)) {
1519                         if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0)
1520                                 body->oa.o_flags = 0;
1521                         body->oa.o_flags |= obd_cksum_type_pack(obd_name,
1522                                 cli->cl_cksum_type);
1523                         body->oa.o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1524                 }
1525
1526                 /* Client cksum has been already copied to wire obdo in previous
1527                  * lustre_set_wire_obdo(), and in the case a bulk-read is being
1528                  * resent due to cksum error, this will allow Server to
1529                  * check+dump pages on its side */
1530         }
1531         ptlrpc_request_set_replen(req);
1532
1533         CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
1534         aa = ptlrpc_req_async_args(req);
1535         aa->aa_oa = oa;
1536         aa->aa_requested_nob = requested_nob;
1537         aa->aa_nio_count = niocount;
1538         aa->aa_page_count = page_count;
1539         aa->aa_resends = 0;
1540         aa->aa_ppga = pga;
1541         aa->aa_cli = cli;
1542         INIT_LIST_HEAD(&aa->aa_oaps);
1543
1544         *reqp = req;
1545         niobuf = req_capsule_client_get(pill, &RMF_NIOBUF_REMOTE);
1546         CDEBUG(D_RPCTRACE, "brw rpc %p - object "DOSTID" offset %lld<>%lld\n",
1547                 req, POSTID(&oa->o_oi), niobuf[0].rnb_offset,
1548                 niobuf[niocount - 1].rnb_offset + niobuf[niocount - 1].rnb_len);
1549         RETURN(0);
1550
1551  out:
1552         ptlrpc_req_finished(req);
1553         RETURN(rc);
1554 }
1555
1556 char dbgcksum_file_name[PATH_MAX];
1557
1558 static void dump_all_bulk_pages(struct obdo *oa, __u32 page_count,
1559                                 struct brw_page **pga, __u32 server_cksum,
1560                                 __u32 client_cksum)
1561 {
1562         struct file *filp;
1563         int rc, i;
1564         unsigned int len;
1565         char *buf;
1566
1567         /* will only keep dump of pages on first error for the same range in
1568          * file/fid, not during the resends/retries. */
1569         snprintf(dbgcksum_file_name, sizeof(dbgcksum_file_name),
1570                  "%s-checksum_dump-osc-"DFID":[%llu-%llu]-%x-%x",
1571                  (strncmp(libcfs_debug_file_path_arr, "NONE", 4) != 0 ?
1572                   libcfs_debug_file_path_arr :
1573                   LIBCFS_DEBUG_FILE_PATH_DEFAULT),
1574                  oa->o_valid & OBD_MD_FLFID ? oa->o_parent_seq : 0ULL,
1575                  oa->o_valid & OBD_MD_FLFID ? oa->o_parent_oid : 0,
1576                  oa->o_valid & OBD_MD_FLFID ? oa->o_parent_ver : 0,
1577                  pga[0]->off,
1578                  pga[page_count-1]->off + pga[page_count-1]->count - 1,
1579                  client_cksum, server_cksum);
1580         filp = filp_open(dbgcksum_file_name,
1581                          O_CREAT | O_EXCL | O_WRONLY | O_LARGEFILE, 0600);
1582         if (IS_ERR(filp)) {
1583                 rc = PTR_ERR(filp);
1584                 if (rc == -EEXIST)
1585                         CDEBUG(D_INFO, "%s: can't open to dump pages with "
1586                                "checksum error: rc = %d\n", dbgcksum_file_name,
1587                                rc);
1588                 else
1589                         CERROR("%s: can't open to dump pages with checksum "
1590                                "error: rc = %d\n", dbgcksum_file_name, rc);
1591                 return;
1592         }
1593
1594         for (i = 0; i < page_count; i++) {
1595                 len = pga[i]->count;
1596                 buf = kmap(pga[i]->pg);
1597                 while (len != 0) {
1598                         rc = cfs_kernel_write(filp, buf, len, &filp->f_pos);
1599                         if (rc < 0) {
1600                                 CERROR("%s: wanted to write %u but got %d "
1601                                        "error\n", dbgcksum_file_name, len, rc);
1602                                 break;
1603                         }
1604                         len -= rc;
1605                         buf += rc;
1606                         CDEBUG(D_INFO, "%s: wrote %d bytes\n",
1607                                dbgcksum_file_name, rc);
1608                 }
1609                 kunmap(pga[i]->pg);
1610         }
1611
1612         rc = ll_vfs_fsync_range(filp, 0, LLONG_MAX, 1);
1613         if (rc)
1614                 CERROR("%s: sync returns %d\n", dbgcksum_file_name, rc);
1615         filp_close(filp, NULL);
1616         return;
1617 }
1618
1619 static int
1620 check_write_checksum(struct obdo *oa, const struct lnet_process_id *peer,
1621                      __u32 client_cksum, __u32 server_cksum,
1622                      struct osc_brw_async_args *aa)
1623 {
1624         const char *obd_name = aa->aa_cli->cl_import->imp_obd->obd_name;
1625         enum cksum_types cksum_type;
1626         obd_dif_csum_fn *fn = NULL;
1627         int sector_size = 0;
1628         bool t10pi = false;
1629         __u32 new_cksum;
1630         char *msg;
1631         int rc;
1632
1633         if (server_cksum == client_cksum) {
1634                 CDEBUG(D_PAGE, "checksum %x confirmed\n", client_cksum);
1635                 return 0;
1636         }
1637
1638         if (aa->aa_cli->cl_checksum_dump)
1639                 dump_all_bulk_pages(oa, aa->aa_page_count, aa->aa_ppga,
1640                                     server_cksum, client_cksum);
1641
1642         cksum_type = obd_cksum_type_unpack(oa->o_valid & OBD_MD_FLFLAGS ?
1643                                            oa->o_flags : 0);
1644
1645         switch (cksum_type) {
1646         case OBD_CKSUM_T10IP512:
1647                 t10pi = true;
1648                 fn = obd_dif_ip_fn;
1649                 sector_size = 512;
1650                 break;
1651         case OBD_CKSUM_T10IP4K:
1652                 t10pi = true;
1653                 fn = obd_dif_ip_fn;
1654                 sector_size = 4096;
1655                 break;
1656         case OBD_CKSUM_T10CRC512:
1657                 t10pi = true;
1658                 fn = obd_dif_crc_fn;
1659                 sector_size = 512;
1660                 break;
1661         case OBD_CKSUM_T10CRC4K:
1662                 t10pi = true;
1663                 fn = obd_dif_crc_fn;
1664                 sector_size = 4096;
1665                 break;
1666         default:
1667                 break;
1668         }
1669
1670         if (t10pi)
1671                 rc = osc_checksum_bulk_t10pi(obd_name, aa->aa_requested_nob,
1672                                              aa->aa_page_count,
1673                                              aa->aa_ppga,
1674                                              OST_WRITE,
1675                                              fn,
1676                                              sector_size,
1677                                              &new_cksum);
1678         else
1679                 rc = osc_checksum_bulk(aa->aa_requested_nob, aa->aa_page_count,
1680                                        aa->aa_ppga, OST_WRITE, cksum_type,
1681                                        &new_cksum);
1682
1683         if (rc < 0)
1684                 msg = "failed to calculate the client write checksum";
1685         else if (cksum_type != obd_cksum_type_unpack(aa->aa_oa->o_flags))
1686                 msg = "the server did not use the checksum type specified in "
1687                       "the original request - likely a protocol problem";
1688         else if (new_cksum == server_cksum)
1689                 msg = "changed on the client after we checksummed it - "
1690                       "likely false positive due to mmap IO (bug 11742)";
1691         else if (new_cksum == client_cksum)
1692                 msg = "changed in transit before arrival at OST";
1693         else
1694                 msg = "changed in transit AND doesn't match the original - "
1695                       "likely false positive due to mmap IO (bug 11742)";
1696
1697         LCONSOLE_ERROR_MSG(0x132, "%s: BAD WRITE CHECKSUM: %s: from %s inode "
1698                            DFID " object "DOSTID" extent [%llu-%llu], original "
1699                            "client csum %x (type %x), server csum %x (type %x),"
1700                            " client csum now %x\n",
1701                            obd_name, msg, libcfs_nid2str(peer->nid),
1702                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_seq : (__u64)0,
1703                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_oid : 0,
1704                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_ver : 0,
1705                            POSTID(&oa->o_oi), aa->aa_ppga[0]->off,
1706                            aa->aa_ppga[aa->aa_page_count - 1]->off +
1707                                 aa->aa_ppga[aa->aa_page_count-1]->count - 1,
1708                            client_cksum,
1709                            obd_cksum_type_unpack(aa->aa_oa->o_flags),
1710                            server_cksum, cksum_type, new_cksum);
1711         return 1;
1712 }
1713
1714 /* Note rc enters this function as number of bytes transferred */
1715 static int osc_brw_fini_request(struct ptlrpc_request *req, int rc)
1716 {
1717         struct osc_brw_async_args *aa = (void *)&req->rq_async_args;
1718         struct client_obd *cli = aa->aa_cli;
1719         const char *obd_name = cli->cl_import->imp_obd->obd_name;
1720         const struct lnet_process_id *peer =
1721                 &req->rq_import->imp_connection->c_peer;
1722         struct ost_body *body;
1723         u32 client_cksum = 0;
1724         ENTRY;
1725
1726         if (rc < 0 && rc != -EDQUOT) {
1727                 DEBUG_REQ(D_INFO, req, "Failed request with rc = %d\n", rc);
1728                 RETURN(rc);
1729         }
1730
1731         LASSERTF(req->rq_repmsg != NULL, "rc = %d\n", rc);
1732         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
1733         if (body == NULL) {
1734                 DEBUG_REQ(D_INFO, req, "Can't unpack body\n");
1735                 RETURN(-EPROTO);
1736         }
1737
1738         /* set/clear over quota flag for a uid/gid/projid */
1739         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE &&
1740             body->oa.o_valid & (OBD_MD_FLALLQUOTA)) {
1741                 unsigned qid[LL_MAXQUOTAS] = {
1742                                          body->oa.o_uid, body->oa.o_gid,
1743                                          body->oa.o_projid };
1744                 CDEBUG(D_QUOTA, "setdq for [%u %u %u] with valid %#llx, flags %x\n",
1745                        body->oa.o_uid, body->oa.o_gid, body->oa.o_projid,
1746                        body->oa.o_valid, body->oa.o_flags);
1747                        osc_quota_setdq(cli, qid, body->oa.o_valid,
1748                                        body->oa.o_flags);
1749         }
1750
1751         osc_update_grant(cli, body);
1752
1753         if (rc < 0)
1754                 RETURN(rc);
1755
1756         if (aa->aa_oa->o_valid & OBD_MD_FLCKSUM)
1757                 client_cksum = aa->aa_oa->o_cksum; /* save for later */
1758
1759         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE) {
1760                 if (rc > 0) {
1761                         CERROR("Unexpected +ve rc %d\n", rc);
1762                         RETURN(-EPROTO);
1763                 }
1764
1765                 if (req->rq_bulk != NULL &&
1766                     sptlrpc_cli_unwrap_bulk_write(req, req->rq_bulk))
1767                         RETURN(-EAGAIN);
1768
1769                 if ((aa->aa_oa->o_valid & OBD_MD_FLCKSUM) && client_cksum &&
1770                     check_write_checksum(&body->oa, peer, client_cksum,
1771                                          body->oa.o_cksum, aa))
1772                         RETURN(-EAGAIN);
1773
1774                 rc = check_write_rcs(req, aa->aa_requested_nob,aa->aa_nio_count,
1775                                      aa->aa_page_count, aa->aa_ppga);
1776                 GOTO(out, rc);
1777         }
1778
1779         /* The rest of this function executes only for OST_READs */
1780
1781         if (req->rq_bulk == NULL) {
1782                 rc = req_capsule_get_size(&req->rq_pill, &RMF_SHORT_IO,
1783                                           RCL_SERVER);
1784                 LASSERT(rc == req->rq_status);
1785         } else {
1786                 /* if unwrap_bulk failed, return -EAGAIN to retry */
1787                 rc = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk, rc);
1788         }
1789         if (rc < 0)
1790                 GOTO(out, rc = -EAGAIN);
1791
1792         if (rc > aa->aa_requested_nob) {
1793                 CERROR("Unexpected rc %d (%d requested)\n", rc,
1794                        aa->aa_requested_nob);
1795                 RETURN(-EPROTO);
1796         }
1797
1798         if (req->rq_bulk != NULL && rc != req->rq_bulk->bd_nob_transferred) {
1799                 CERROR ("Unexpected rc %d (%d transferred)\n",
1800                         rc, req->rq_bulk->bd_nob_transferred);
1801                 return (-EPROTO);
1802         }
1803
1804         if (req->rq_bulk == NULL) {
1805                 /* short io */
1806                 int nob, pg_count, i = 0;
1807                 unsigned char *buf;
1808
1809                 CDEBUG(D_CACHE, "Using short io read, size %d\n", rc);
1810                 pg_count = aa->aa_page_count;
1811                 buf = req_capsule_server_sized_get(&req->rq_pill, &RMF_SHORT_IO,
1812                                                    rc);
1813                 nob = rc;
1814                 while (nob > 0 && pg_count > 0) {
1815                         unsigned char *ptr;
1816                         int count = aa->aa_ppga[i]->count > nob ?
1817                                     nob : aa->aa_ppga[i]->count;
1818
1819                         CDEBUG(D_CACHE, "page %p count %d\n",
1820                                aa->aa_ppga[i]->pg, count);
1821                         ptr = ll_kmap_atomic(aa->aa_ppga[i]->pg, KM_USER0);
1822                         memcpy(ptr + (aa->aa_ppga[i]->off & ~PAGE_MASK), buf,
1823                                count);
1824                         ll_kunmap_atomic((void *) ptr, KM_USER0);
1825
1826                         buf += count;
1827                         nob -= count;
1828                         i++;
1829                         pg_count--;
1830                 }
1831         }
1832
1833         if (rc < aa->aa_requested_nob)
1834                 handle_short_read(rc, aa->aa_page_count, aa->aa_ppga);
1835
1836         if (body->oa.o_valid & OBD_MD_FLCKSUM) {
1837                 static int cksum_counter;
1838                 u32        server_cksum = body->oa.o_cksum;
1839                 char      *via = "";
1840                 char      *router = "";
1841                 enum cksum_types cksum_type;
1842                 u32 o_flags = body->oa.o_valid & OBD_MD_FLFLAGS ?
1843                         body->oa.o_flags : 0;
1844
1845                 cksum_type = obd_cksum_type_unpack(o_flags);
1846                 rc = osc_checksum_bulk_rw(obd_name, cksum_type, rc,
1847                                           aa->aa_page_count, aa->aa_ppga,
1848                                           OST_READ, &client_cksum);
1849                 if (rc < 0)
1850                         GOTO(out, rc);
1851
1852                 if (req->rq_bulk != NULL &&
1853                     peer->nid != req->rq_bulk->bd_sender) {
1854                         via = " via ";
1855                         router = libcfs_nid2str(req->rq_bulk->bd_sender);
1856                 }
1857
1858                 if (server_cksum != client_cksum) {
1859                         struct ost_body *clbody;
1860                         u32 page_count = aa->aa_page_count;
1861
1862                         clbody = req_capsule_client_get(&req->rq_pill,
1863                                                         &RMF_OST_BODY);
1864                         if (cli->cl_checksum_dump)
1865                                 dump_all_bulk_pages(&clbody->oa, page_count,
1866                                                     aa->aa_ppga, server_cksum,
1867                                                     client_cksum);
1868
1869                         LCONSOLE_ERROR_MSG(0x133, "%s: BAD READ CHECKSUM: from "
1870                                            "%s%s%s inode "DFID" object "DOSTID
1871                                            " extent [%llu-%llu], client %x, "
1872                                            "server %x, cksum_type %x\n",
1873                                            obd_name,
1874                                            libcfs_nid2str(peer->nid),
1875                                            via, router,
1876                                            clbody->oa.o_valid & OBD_MD_FLFID ?
1877                                                 clbody->oa.o_parent_seq : 0ULL,
1878                                            clbody->oa.o_valid & OBD_MD_FLFID ?
1879                                                 clbody->oa.o_parent_oid : 0,
1880                                            clbody->oa.o_valid & OBD_MD_FLFID ?
1881                                                 clbody->oa.o_parent_ver : 0,
1882                                            POSTID(&body->oa.o_oi),
1883                                            aa->aa_ppga[0]->off,
1884                                            aa->aa_ppga[page_count-1]->off +
1885                                            aa->aa_ppga[page_count-1]->count - 1,
1886                                            client_cksum, server_cksum,
1887                                            cksum_type);
1888                         cksum_counter = 0;
1889                         aa->aa_oa->o_cksum = client_cksum;
1890                         rc = -EAGAIN;
1891                 } else {
1892                         cksum_counter++;
1893                         CDEBUG(D_PAGE, "checksum %x confirmed\n", client_cksum);
1894                         rc = 0;
1895                 }
1896         } else if (unlikely(client_cksum)) {
1897                 static int cksum_missed;
1898
1899                 cksum_missed++;
1900                 if ((cksum_missed & (-cksum_missed)) == cksum_missed)
1901                         CERROR("Checksum %u requested from %s but not sent\n",
1902                                cksum_missed, libcfs_nid2str(peer->nid));
1903         } else {
1904                 rc = 0;
1905         }
1906 out:
1907         if (rc >= 0)
1908                 lustre_get_wire_obdo(&req->rq_import->imp_connect_data,
1909                                      aa->aa_oa, &body->oa);
1910
1911         RETURN(rc);
1912 }
1913
1914 static int osc_brw_redo_request(struct ptlrpc_request *request,
1915                                 struct osc_brw_async_args *aa, int rc)
1916 {
1917         struct ptlrpc_request *new_req;
1918         struct osc_brw_async_args *new_aa;
1919         struct osc_async_page *oap;
1920         ENTRY;
1921
1922         DEBUG_REQ(rc == -EINPROGRESS ? D_RPCTRACE : D_ERROR, request,
1923                   "redo for recoverable error %d", rc);
1924
1925         rc = osc_brw_prep_request(lustre_msg_get_opc(request->rq_reqmsg) ==
1926                                 OST_WRITE ? OBD_BRW_WRITE : OBD_BRW_READ,
1927                                   aa->aa_cli, aa->aa_oa, aa->aa_page_count,
1928                                   aa->aa_ppga, &new_req, 1);
1929         if (rc)
1930                 RETURN(rc);
1931
1932         list_for_each_entry(oap, &aa->aa_oaps, oap_rpc_item) {
1933                 if (oap->oap_request != NULL) {
1934                         LASSERTF(request == oap->oap_request,
1935                                  "request %p != oap_request %p\n",
1936                                  request, oap->oap_request);
1937                         if (oap->oap_interrupted) {
1938                                 ptlrpc_req_finished(new_req);
1939                                 RETURN(-EINTR);
1940                         }
1941                 }
1942         }
1943         /* New request takes over pga and oaps from old request.
1944          * Note that copying a list_head doesn't work, need to move it... */
1945         aa->aa_resends++;
1946         new_req->rq_interpret_reply = request->rq_interpret_reply;
1947         new_req->rq_async_args = request->rq_async_args;
1948         new_req->rq_commit_cb = request->rq_commit_cb;
1949         /* cap resend delay to the current request timeout, this is similar to
1950          * what ptlrpc does (see after_reply()) */
1951         if (aa->aa_resends > new_req->rq_timeout)
1952                 new_req->rq_sent = ktime_get_real_seconds() + new_req->rq_timeout;
1953         else
1954                 new_req->rq_sent = ktime_get_real_seconds() + aa->aa_resends;
1955         new_req->rq_generation_set = 1;
1956         new_req->rq_import_generation = request->rq_import_generation;
1957
1958         new_aa = ptlrpc_req_async_args(new_req);
1959
1960         INIT_LIST_HEAD(&new_aa->aa_oaps);
1961         list_splice_init(&aa->aa_oaps, &new_aa->aa_oaps);
1962         INIT_LIST_HEAD(&new_aa->aa_exts);
1963         list_splice_init(&aa->aa_exts, &new_aa->aa_exts);
1964         new_aa->aa_resends = aa->aa_resends;
1965
1966         list_for_each_entry(oap, &new_aa->aa_oaps, oap_rpc_item) {
1967                 if (oap->oap_request) {
1968                         ptlrpc_req_finished(oap->oap_request);
1969                         oap->oap_request = ptlrpc_request_addref(new_req);
1970                 }
1971         }
1972
1973         /* XXX: This code will run into problem if we're going to support
1974          * to add a series of BRW RPCs into a self-defined ptlrpc_request_set
1975          * and wait for all of them to be finished. We should inherit request
1976          * set from old request. */
1977         ptlrpcd_add_req(new_req);
1978
1979         DEBUG_REQ(D_INFO, new_req, "new request");
1980         RETURN(0);
1981 }
1982
1983 /*
1984  * ugh, we want disk allocation on the target to happen in offset order.  we'll
1985  * follow sedgewicks advice and stick to the dead simple shellsort -- it'll do
1986  * fine for our small page arrays and doesn't require allocation.  its an
1987  * insertion sort that swaps elements that are strides apart, shrinking the
1988  * stride down until its '1' and the array is sorted.
1989  */
1990 static void sort_brw_pages(struct brw_page **array, int num)
1991 {
1992         int stride, i, j;
1993         struct brw_page *tmp;
1994
1995         if (num == 1)
1996                 return;
1997         for (stride = 1; stride < num ; stride = (stride * 3) + 1)
1998                 ;
1999
2000         do {
2001                 stride /= 3;
2002                 for (i = stride ; i < num ; i++) {
2003                         tmp = array[i];
2004                         j = i;
2005                         while (j >= stride && array[j - stride]->off > tmp->off) {
2006                                 array[j] = array[j - stride];
2007                                 j -= stride;
2008                         }
2009                         array[j] = tmp;
2010                 }
2011         } while (stride > 1);
2012 }
2013
2014 static void osc_release_ppga(struct brw_page **ppga, size_t count)
2015 {
2016         LASSERT(ppga != NULL);
2017         OBD_FREE(ppga, sizeof(*ppga) * count);
2018 }
2019
2020 static int brw_interpret(const struct lu_env *env,
2021                          struct ptlrpc_request *req, void *data, int rc)
2022 {
2023         struct osc_brw_async_args *aa = data;
2024         struct osc_extent *ext;
2025         struct osc_extent *tmp;
2026         struct client_obd *cli = aa->aa_cli;
2027         unsigned long           transferred = 0;
2028         ENTRY;
2029
2030         rc = osc_brw_fini_request(req, rc);
2031         CDEBUG(D_INODE, "request %p aa %p rc %d\n", req, aa, rc);
2032         /* When server return -EINPROGRESS, client should always retry
2033          * regardless of the number of times the bulk was resent already. */
2034         if (osc_recoverable_error(rc) && !req->rq_no_delay) {
2035                 if (req->rq_import_generation !=
2036                     req->rq_import->imp_generation) {
2037                         CDEBUG(D_HA, "%s: resend cross eviction for object: "
2038                                ""DOSTID", rc = %d.\n",
2039                                req->rq_import->imp_obd->obd_name,
2040                                POSTID(&aa->aa_oa->o_oi), rc);
2041                 } else if (rc == -EINPROGRESS ||
2042                     client_should_resend(aa->aa_resends, aa->aa_cli)) {
2043                         rc = osc_brw_redo_request(req, aa, rc);
2044                 } else {
2045                         CERROR("%s: too many resent retries for object: "
2046                                "%llu:%llu, rc = %d.\n",
2047                                req->rq_import->imp_obd->obd_name,
2048                                POSTID(&aa->aa_oa->o_oi), rc);
2049                 }
2050
2051                 if (rc == 0)
2052                         RETURN(0);
2053                 else if (rc == -EAGAIN || rc == -EINPROGRESS)
2054                         rc = -EIO;
2055         }
2056
2057         if (rc == 0) {
2058                 struct obdo *oa = aa->aa_oa;
2059                 struct cl_attr *attr = &osc_env_info(env)->oti_attr;
2060                 unsigned long valid = 0;
2061                 struct cl_object *obj;
2062                 struct osc_async_page *last;
2063
2064                 last = brw_page2oap(aa->aa_ppga[aa->aa_page_count - 1]);
2065                 obj = osc2cl(last->oap_obj);
2066
2067                 cl_object_attr_lock(obj);
2068                 if (oa->o_valid & OBD_MD_FLBLOCKS) {
2069                         attr->cat_blocks = oa->o_blocks;
2070                         valid |= CAT_BLOCKS;
2071                 }
2072                 if (oa->o_valid & OBD_MD_FLMTIME) {
2073                         attr->cat_mtime = oa->o_mtime;
2074                         valid |= CAT_MTIME;
2075                 }
2076                 if (oa->o_valid & OBD_MD_FLATIME) {
2077                         attr->cat_atime = oa->o_atime;
2078                         valid |= CAT_ATIME;
2079                 }
2080                 if (oa->o_valid & OBD_MD_FLCTIME) {
2081                         attr->cat_ctime = oa->o_ctime;
2082                         valid |= CAT_CTIME;
2083                 }
2084
2085                 if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE) {
2086                         struct lov_oinfo *loi = cl2osc(obj)->oo_oinfo;
2087                         loff_t last_off = last->oap_count + last->oap_obj_off +
2088                                 last->oap_page_off;
2089
2090                         /* Change file size if this is an out of quota or
2091                          * direct IO write and it extends the file size */
2092                         if (loi->loi_lvb.lvb_size < last_off) {
2093                                 attr->cat_size = last_off;
2094                                 valid |= CAT_SIZE;
2095                         }
2096                         /* Extend KMS if it's not a lockless write */
2097                         if (loi->loi_kms < last_off &&
2098                             oap2osc_page(last)->ops_srvlock == 0) {
2099                                 attr->cat_kms = last_off;
2100                                 valid |= CAT_KMS;
2101                         }
2102                 }
2103
2104                 if (valid != 0)
2105                         cl_object_attr_update(env, obj, attr, valid);
2106                 cl_object_attr_unlock(obj);
2107         }
2108         OBD_SLAB_FREE_PTR(aa->aa_oa, osc_obdo_kmem);
2109
2110         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE && rc == 0)
2111                 osc_inc_unstable_pages(req);
2112
2113         list_for_each_entry_safe(ext, tmp, &aa->aa_exts, oe_link) {
2114                 list_del_init(&ext->oe_link);
2115                 osc_extent_finish(env, ext, 1,
2116                                   rc && req->rq_no_delay ? -EWOULDBLOCK : rc);
2117         }
2118         LASSERT(list_empty(&aa->aa_exts));
2119         LASSERT(list_empty(&aa->aa_oaps));
2120
2121         transferred = (req->rq_bulk == NULL ? /* short io */
2122                        aa->aa_requested_nob :
2123                        req->rq_bulk->bd_nob_transferred);
2124
2125         osc_release_ppga(aa->aa_ppga, aa->aa_page_count);
2126         ptlrpc_lprocfs_brw(req, transferred);
2127
2128         spin_lock(&cli->cl_loi_list_lock);
2129         /* We need to decrement before osc_ap_completion->osc_wake_cache_waiters
2130          * is called so we know whether to go to sync BRWs or wait for more
2131          * RPCs to complete */
2132         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE)
2133                 cli->cl_w_in_flight--;
2134         else
2135                 cli->cl_r_in_flight--;
2136         osc_wake_cache_waiters(cli);
2137         spin_unlock(&cli->cl_loi_list_lock);
2138
2139         osc_io_unplug(env, cli, NULL);
2140         RETURN(rc);
2141 }
2142
2143 static void brw_commit(struct ptlrpc_request *req)
2144 {
2145         /* If osc_inc_unstable_pages (via osc_extent_finish) races with
2146          * this called via the rq_commit_cb, I need to ensure
2147          * osc_dec_unstable_pages is still called. Otherwise unstable
2148          * pages may be leaked. */
2149         spin_lock(&req->rq_lock);
2150         if (likely(req->rq_unstable)) {
2151                 req->rq_unstable = 0;
2152                 spin_unlock(&req->rq_lock);
2153
2154                 osc_dec_unstable_pages(req);
2155         } else {
2156                 req->rq_committed = 1;
2157                 spin_unlock(&req->rq_lock);
2158         }
2159 }
2160
2161 /**
2162  * Build an RPC by the list of extent @ext_list. The caller must ensure
2163  * that the total pages in this list are NOT over max pages per RPC.
2164  * Extents in the list must be in OES_RPC state.
2165  */
2166 int osc_build_rpc(const struct lu_env *env, struct client_obd *cli,
2167                   struct list_head *ext_list, int cmd)
2168 {
2169         struct ptlrpc_request           *req = NULL;
2170         struct osc_extent               *ext;
2171         struct brw_page                 **pga = NULL;
2172         struct osc_brw_async_args       *aa = NULL;
2173         struct obdo                     *oa = NULL;
2174         struct osc_async_page           *oap;
2175         struct osc_object               *obj = NULL;
2176         struct cl_req_attr              *crattr = NULL;
2177         loff_t                          starting_offset = OBD_OBJECT_EOF;
2178         loff_t                          ending_offset = 0;
2179         int                             mpflag = 0;
2180         int                             mem_tight = 0;
2181         int                             page_count = 0;
2182         bool                            soft_sync = false;
2183         bool                            interrupted = false;
2184         bool                            ndelay = false;
2185         int                             i;
2186         int                             grant = 0;
2187         int                             rc;
2188         __u32                           layout_version = 0;
2189         struct list_head                rpc_list = LIST_HEAD_INIT(rpc_list);
2190         struct ost_body                 *body;
2191         ENTRY;
2192         LASSERT(!list_empty(ext_list));
2193
2194         /* add pages into rpc_list to build BRW rpc */
2195         list_for_each_entry(ext, ext_list, oe_link) {
2196                 LASSERT(ext->oe_state == OES_RPC);
2197                 mem_tight |= ext->oe_memalloc;
2198                 grant += ext->oe_grants;
2199                 page_count += ext->oe_nr_pages;
2200                 layout_version = MAX(layout_version, ext->oe_layout_version);
2201                 if (obj == NULL)
2202                         obj = ext->oe_obj;
2203         }
2204
2205         soft_sync = osc_over_unstable_soft_limit(cli);
2206         if (mem_tight)
2207                 mpflag = cfs_memory_pressure_get_and_set();
2208
2209         OBD_ALLOC(pga, sizeof(*pga) * page_count);
2210         if (pga == NULL)
2211                 GOTO(out, rc = -ENOMEM);
2212
2213         OBD_SLAB_ALLOC_PTR_GFP(oa, osc_obdo_kmem, GFP_NOFS);
2214         if (oa == NULL)
2215                 GOTO(out, rc = -ENOMEM);
2216
2217         i = 0;
2218         list_for_each_entry(ext, ext_list, oe_link) {
2219                 list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) {
2220                         if (mem_tight)
2221                                 oap->oap_brw_flags |= OBD_BRW_MEMALLOC;
2222                         if (soft_sync)
2223                                 oap->oap_brw_flags |= OBD_BRW_SOFT_SYNC;
2224                         pga[i] = &oap->oap_brw_page;
2225                         pga[i]->off = oap->oap_obj_off + oap->oap_page_off;
2226                         i++;
2227
2228                         list_add_tail(&oap->oap_rpc_item, &rpc_list);
2229                         if (starting_offset == OBD_OBJECT_EOF ||
2230                             starting_offset > oap->oap_obj_off)
2231                                 starting_offset = oap->oap_obj_off;
2232                         else
2233                                 LASSERT(oap->oap_page_off == 0);
2234                         if (ending_offset < oap->oap_obj_off + oap->oap_count)
2235                                 ending_offset = oap->oap_obj_off +
2236                                                 oap->oap_count;
2237                         else
2238                                 LASSERT(oap->oap_page_off + oap->oap_count ==
2239                                         PAGE_SIZE);
2240                         if (oap->oap_interrupted)
2241                                 interrupted = true;
2242                 }
2243                 if (ext->oe_ndelay)
2244                         ndelay = true;
2245         }
2246
2247         /* first page in the list */
2248         oap = list_entry(rpc_list.next, typeof(*oap), oap_rpc_item);
2249
2250         crattr = &osc_env_info(env)->oti_req_attr;
2251         memset(crattr, 0, sizeof(*crattr));
2252         crattr->cra_type = (cmd & OBD_BRW_WRITE) ? CRT_WRITE : CRT_READ;
2253         crattr->cra_flags = ~0ULL;
2254         crattr->cra_page = oap2cl_page(oap);
2255         crattr->cra_oa = oa;
2256         cl_req_attr_set(env, osc2cl(obj), crattr);
2257
2258         if (cmd == OBD_BRW_WRITE) {
2259                 oa->o_grant_used = grant;
2260                 if (layout_version > 0) {
2261                         CDEBUG(D_LAYOUT, DFID": write with layout version %u\n",
2262                                PFID(&oa->o_oi.oi_fid), layout_version);
2263
2264                         oa->o_layout_version = layout_version;
2265                         oa->o_valid |= OBD_MD_LAYOUT_VERSION;
2266                 }
2267         }
2268
2269         sort_brw_pages(pga, page_count);
2270         rc = osc_brw_prep_request(cmd, cli, oa, page_count, pga, &req, 0);
2271         if (rc != 0) {
2272                 CERROR("prep_req failed: %d\n", rc);
2273                 GOTO(out, rc);
2274         }
2275
2276         req->rq_commit_cb = brw_commit;
2277         req->rq_interpret_reply = brw_interpret;
2278         req->rq_memalloc = mem_tight != 0;
2279         oap->oap_request = ptlrpc_request_addref(req);
2280         if (interrupted && !req->rq_intr)
2281                 ptlrpc_mark_interrupted(req);
2282         if (ndelay) {
2283                 req->rq_no_resend = req->rq_no_delay = 1;
2284                 /* probably set a shorter timeout value.
2285                  * to handle ETIMEDOUT in brw_interpret() correctly. */
2286                 /* lustre_msg_set_timeout(req, req->rq_timeout / 2); */
2287         }
2288
2289         /* Need to update the timestamps after the request is built in case
2290          * we race with setattr (locally or in queue at OST).  If OST gets
2291          * later setattr before earlier BRW (as determined by the request xid),
2292          * the OST will not use BRW timestamps.  Sadly, there is no obvious
2293          * way to do this in a single call.  bug 10150 */
2294         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
2295         crattr->cra_oa = &body->oa;
2296         crattr->cra_flags = OBD_MD_FLMTIME | OBD_MD_FLCTIME | OBD_MD_FLATIME;
2297         cl_req_attr_set(env, osc2cl(obj), crattr);
2298         lustre_msg_set_jobid(req->rq_reqmsg, crattr->cra_jobid);
2299
2300         CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
2301         aa = ptlrpc_req_async_args(req);
2302         INIT_LIST_HEAD(&aa->aa_oaps);
2303         list_splice_init(&rpc_list, &aa->aa_oaps);
2304         INIT_LIST_HEAD(&aa->aa_exts);
2305         list_splice_init(ext_list, &aa->aa_exts);
2306
2307         spin_lock(&cli->cl_loi_list_lock);
2308         starting_offset >>= PAGE_SHIFT;
2309         if (cmd == OBD_BRW_READ) {
2310                 cli->cl_r_in_flight++;
2311                 lprocfs_oh_tally_log2(&cli->cl_read_page_hist, page_count);
2312                 lprocfs_oh_tally(&cli->cl_read_rpc_hist, cli->cl_r_in_flight);
2313                 lprocfs_oh_tally_log2(&cli->cl_read_offset_hist,
2314                                       starting_offset + 1);
2315         } else {
2316                 cli->cl_w_in_flight++;
2317                 lprocfs_oh_tally_log2(&cli->cl_write_page_hist, page_count);
2318                 lprocfs_oh_tally(&cli->cl_write_rpc_hist, cli->cl_w_in_flight);
2319                 lprocfs_oh_tally_log2(&cli->cl_write_offset_hist,
2320                                       starting_offset + 1);
2321         }
2322         spin_unlock(&cli->cl_loi_list_lock);
2323
2324         DEBUG_REQ(D_INODE, req, "%d pages, aa %p. now %ur/%uw in flight",
2325                   page_count, aa, cli->cl_r_in_flight,
2326                   cli->cl_w_in_flight);
2327         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_DELAY_IO, cfs_fail_val);
2328
2329         ptlrpcd_add_req(req);
2330         rc = 0;
2331         EXIT;
2332
2333 out:
2334         if (mem_tight != 0)
2335                 cfs_memory_pressure_restore(mpflag);
2336
2337         if (rc != 0) {
2338                 LASSERT(req == NULL);
2339
2340                 if (oa)
2341                         OBD_SLAB_FREE_PTR(oa, osc_obdo_kmem);
2342                 if (pga)
2343                         OBD_FREE(pga, sizeof(*pga) * page_count);
2344                 /* this should happen rarely and is pretty bad, it makes the
2345                  * pending list not follow the dirty order */
2346                 while (!list_empty(ext_list)) {
2347                         ext = list_entry(ext_list->next, struct osc_extent,
2348                                          oe_link);
2349                         list_del_init(&ext->oe_link);
2350                         osc_extent_finish(env, ext, 0, rc);
2351                 }
2352         }
2353         RETURN(rc);
2354 }
2355
2356 static int osc_set_lock_data(struct ldlm_lock *lock, void *data)
2357 {
2358         int set = 0;
2359
2360         LASSERT(lock != NULL);
2361
2362         lock_res_and_lock(lock);
2363
2364         if (lock->l_ast_data == NULL)
2365                 lock->l_ast_data = data;
2366         if (lock->l_ast_data == data)
2367                 set = 1;
2368
2369         unlock_res_and_lock(lock);
2370
2371         return set;
2372 }
2373
2374 int osc_enqueue_fini(struct ptlrpc_request *req, osc_enqueue_upcall_f upcall,
2375                      void *cookie, struct lustre_handle *lockh,
2376                      enum ldlm_mode mode, __u64 *flags, bool speculative,
2377                      int errcode)
2378 {
2379         bool intent = *flags & LDLM_FL_HAS_INTENT;
2380         int rc;
2381         ENTRY;
2382
2383         /* The request was created before ldlm_cli_enqueue call. */
2384         if (intent && errcode == ELDLM_LOCK_ABORTED) {
2385                 struct ldlm_reply *rep;
2386
2387                 rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
2388                 LASSERT(rep != NULL);
2389
2390                 rep->lock_policy_res1 =
2391                         ptlrpc_status_ntoh(rep->lock_policy_res1);
2392                 if (rep->lock_policy_res1)
2393                         errcode = rep->lock_policy_res1;
2394                 if (!speculative)
2395                         *flags |= LDLM_FL_LVB_READY;
2396         } else if (errcode == ELDLM_OK) {
2397                 *flags |= LDLM_FL_LVB_READY;
2398         }
2399
2400         /* Call the update callback. */
2401         rc = (*upcall)(cookie, lockh, errcode);
2402
2403         /* release the reference taken in ldlm_cli_enqueue() */
2404         if (errcode == ELDLM_LOCK_MATCHED)
2405                 errcode = ELDLM_OK;
2406         if (errcode == ELDLM_OK && lustre_handle_is_used(lockh))
2407                 ldlm_lock_decref(lockh, mode);
2408
2409         RETURN(rc);
2410 }
2411
2412 int osc_enqueue_interpret(const struct lu_env *env, struct ptlrpc_request *req,
2413                           struct osc_enqueue_args *aa, int rc)
2414 {
2415         struct ldlm_lock *lock;
2416         struct lustre_handle *lockh = &aa->oa_lockh;
2417         enum ldlm_mode mode = aa->oa_mode;
2418         struct ost_lvb *lvb = aa->oa_lvb;
2419         __u32 lvb_len = sizeof(*lvb);
2420         __u64 flags = 0;
2421
2422         ENTRY;
2423
2424         /* ldlm_cli_enqueue is holding a reference on the lock, so it must
2425          * be valid. */
2426         lock = ldlm_handle2lock(lockh);
2427         LASSERTF(lock != NULL,
2428                  "lockh %#llx, req %p, aa %p - client evicted?\n",
2429                  lockh->cookie, req, aa);
2430
2431         /* Take an additional reference so that a blocking AST that
2432          * ldlm_cli_enqueue_fini() might post for a failed lock, is guaranteed
2433          * to arrive after an upcall has been executed by
2434          * osc_enqueue_fini(). */
2435         ldlm_lock_addref(lockh, mode);
2436
2437         /* Let cl_lock_state_wait fail with -ERESTARTSYS to unuse sublocks. */
2438         OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_ENQUEUE_HANG, 2);
2439
2440         /* Let CP AST to grant the lock first. */
2441         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_ENQ_RACE, 1);
2442
2443         if (aa->oa_speculative) {
2444                 LASSERT(aa->oa_lvb == NULL);
2445                 LASSERT(aa->oa_flags == NULL);
2446                 aa->oa_flags = &flags;
2447         }
2448
2449         /* Complete obtaining the lock procedure. */
2450         rc = ldlm_cli_enqueue_fini(aa->oa_exp, req, aa->oa_type, 1,
2451                                    aa->oa_mode, aa->oa_flags, lvb, lvb_len,
2452                                    lockh, rc);
2453         /* Complete osc stuff. */
2454         rc = osc_enqueue_fini(req, aa->oa_upcall, aa->oa_cookie, lockh, mode,
2455                               aa->oa_flags, aa->oa_speculative, rc);
2456
2457         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_CANCEL_RACE, 10);
2458
2459         ldlm_lock_decref(lockh, mode);
2460         LDLM_LOCK_PUT(lock);
2461         RETURN(rc);
2462 }
2463
2464 struct ptlrpc_request_set *PTLRPCD_SET = (void *)1;
2465
2466 /* When enqueuing asynchronously, locks are not ordered, we can obtain a lock
2467  * from the 2nd OSC before a lock from the 1st one. This does not deadlock with
2468  * other synchronous requests, however keeping some locks and trying to obtain
2469  * others may take a considerable amount of time in a case of ost failure; and
2470  * when other sync requests do not get released lock from a client, the client
2471  * is evicted from the cluster -- such scenarious make the life difficult, so
2472  * release locks just after they are obtained. */
2473 int osc_enqueue_base(struct obd_export *exp, struct ldlm_res_id *res_id,
2474                      __u64 *flags, union ldlm_policy_data *policy,
2475                      struct ost_lvb *lvb, int kms_valid,
2476                      osc_enqueue_upcall_f upcall, void *cookie,
2477                      struct ldlm_enqueue_info *einfo,
2478                      struct ptlrpc_request_set *rqset, int async,
2479                      bool speculative)
2480 {
2481         struct obd_device *obd = exp->exp_obd;
2482         struct lustre_handle lockh = { 0 };
2483         struct ptlrpc_request *req = NULL;
2484         int intent = *flags & LDLM_FL_HAS_INTENT;
2485         __u64 match_flags = *flags;
2486         enum ldlm_mode mode;
2487         int rc;
2488         ENTRY;
2489
2490         /* Filesystem lock extents are extended to page boundaries so that
2491          * dealing with the page cache is a little smoother.  */
2492         policy->l_extent.start -= policy->l_extent.start & ~PAGE_MASK;
2493         policy->l_extent.end |= ~PAGE_MASK;
2494
2495         /*
2496          * kms is not valid when either object is completely fresh (so that no
2497          * locks are cached), or object was evicted. In the latter case cached
2498          * lock cannot be used, because it would prime inode state with
2499          * potentially stale LVB.
2500          */
2501         if (!kms_valid)
2502                 goto no_match;
2503
2504         /* Next, search for already existing extent locks that will cover us */
2505         /* If we're trying to read, we also search for an existing PW lock.  The
2506          * VFS and page cache already protect us locally, so lots of readers/
2507          * writers can share a single PW lock.
2508          *
2509          * There are problems with conversion deadlocks, so instead of
2510          * converting a read lock to a write lock, we'll just enqueue a new
2511          * one.
2512          *
2513          * At some point we should cancel the read lock instead of making them
2514          * send us a blocking callback, but there are problems with canceling
2515          * locks out from other users right now, too. */
2516         mode = einfo->ei_mode;
2517         if (einfo->ei_mode == LCK_PR)
2518                 mode |= LCK_PW;
2519         /* Normal lock requests must wait for the LVB to be ready before
2520          * matching a lock; speculative lock requests do not need to,
2521          * because they will not actually use the lock. */
2522         if (!speculative)
2523                 match_flags |= LDLM_FL_LVB_READY;
2524         if (intent != 0)
2525                 match_flags |= LDLM_FL_BLOCK_GRANTED;
2526         mode = ldlm_lock_match(obd->obd_namespace, match_flags, res_id,
2527                                einfo->ei_type, policy, mode, &lockh, 0);
2528         if (mode) {
2529                 struct ldlm_lock *matched;
2530
2531                 if (*flags & LDLM_FL_TEST_LOCK)
2532                         RETURN(ELDLM_OK);
2533
2534                 matched = ldlm_handle2lock(&lockh);
2535                 if (speculative) {
2536                         /* This DLM lock request is speculative, and does not
2537                          * have an associated IO request. Therefore if there
2538                          * is already a DLM lock, it wll just inform the
2539                          * caller to cancel the request for this stripe.*/
2540                         lock_res_and_lock(matched);
2541                         if (ldlm_extent_equal(&policy->l_extent,
2542                             &matched->l_policy_data.l_extent))
2543                                 rc = -EEXIST;
2544                         else
2545                                 rc = -ECANCELED;
2546                         unlock_res_and_lock(matched);
2547
2548                         ldlm_lock_decref(&lockh, mode);
2549                         LDLM_LOCK_PUT(matched);
2550                         RETURN(rc);
2551                 } else if (osc_set_lock_data(matched, einfo->ei_cbdata)) {
2552                         *flags |= LDLM_FL_LVB_READY;
2553
2554                         /* We already have a lock, and it's referenced. */
2555                         (*upcall)(cookie, &lockh, ELDLM_LOCK_MATCHED);
2556
2557                         ldlm_lock_decref(&lockh, mode);
2558                         LDLM_LOCK_PUT(matched);
2559                         RETURN(ELDLM_OK);
2560                 } else {
2561                         ldlm_lock_decref(&lockh, mode);
2562                         LDLM_LOCK_PUT(matched);
2563                 }
2564         }
2565
2566 no_match:
2567         if (*flags & (LDLM_FL_TEST_LOCK | LDLM_FL_MATCH_LOCK))
2568                 RETURN(-ENOLCK);
2569
2570         if (intent) {
2571                 req = ptlrpc_request_alloc(class_exp2cliimp(exp),
2572                                            &RQF_LDLM_ENQUEUE_LVB);
2573                 if (req == NULL)
2574                         RETURN(-ENOMEM);
2575
2576                 rc = ldlm_prep_enqueue_req(exp, req, NULL, 0);
2577                 if (rc) {
2578                         ptlrpc_request_free(req);
2579                         RETURN(rc);
2580                 }
2581
2582                 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
2583                                      sizeof *lvb);
2584                 ptlrpc_request_set_replen(req);
2585         }
2586
2587         /* users of osc_enqueue() can pass this flag for ldlm_lock_match() */
2588         *flags &= ~LDLM_FL_BLOCK_GRANTED;
2589
2590         rc = ldlm_cli_enqueue(exp, &req, einfo, res_id, policy, flags, lvb,
2591                               sizeof(*lvb), LVB_T_OST, &lockh, async);
2592         if (async) {
2593                 if (!rc) {
2594                         struct osc_enqueue_args *aa;
2595                         CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
2596                         aa = ptlrpc_req_async_args(req);
2597                         aa->oa_exp         = exp;
2598                         aa->oa_mode        = einfo->ei_mode;
2599                         aa->oa_type        = einfo->ei_type;
2600                         lustre_handle_copy(&aa->oa_lockh, &lockh);
2601                         aa->oa_upcall      = upcall;
2602                         aa->oa_cookie      = cookie;
2603                         aa->oa_speculative = speculative;
2604                         if (!speculative) {
2605                                 aa->oa_flags  = flags;
2606                                 aa->oa_lvb    = lvb;
2607                         } else {
2608                                 /* speculative locks are essentially to enqueue
2609                                  * a DLM lock  in advance, so we don't care
2610                                  * about the result of the enqueue. */
2611                                 aa->oa_lvb    = NULL;
2612                                 aa->oa_flags  = NULL;
2613                         }
2614
2615                         req->rq_interpret_reply =
2616                                 (ptlrpc_interpterer_t)osc_enqueue_interpret;
2617                         if (rqset == PTLRPCD_SET)
2618                                 ptlrpcd_add_req(req);
2619                         else
2620                                 ptlrpc_set_add_req(rqset, req);
2621                 } else if (intent) {
2622                         ptlrpc_req_finished(req);
2623                 }
2624                 RETURN(rc);
2625         }
2626
2627         rc = osc_enqueue_fini(req, upcall, cookie, &lockh, einfo->ei_mode,
2628                               flags, speculative, rc);
2629         if (intent)
2630                 ptlrpc_req_finished(req);
2631
2632         RETURN(rc);
2633 }
2634
2635 int osc_match_base(struct obd_export *exp, struct ldlm_res_id *res_id,
2636                    enum ldlm_type type, union ldlm_policy_data *policy,
2637                    enum ldlm_mode mode, __u64 *flags, void *data,
2638                    struct lustre_handle *lockh, int unref)
2639 {
2640         struct obd_device *obd = exp->exp_obd;
2641         __u64 lflags = *flags;
2642         enum ldlm_mode rc;
2643         ENTRY;
2644
2645         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_MATCH))
2646                 RETURN(-EIO);
2647
2648         /* Filesystem lock extents are extended to page boundaries so that
2649          * dealing with the page cache is a little smoother */
2650         policy->l_extent.start -= policy->l_extent.start & ~PAGE_MASK;
2651         policy->l_extent.end |= ~PAGE_MASK;
2652
2653         /* Next, search for already existing extent locks that will cover us */
2654         /* If we're trying to read, we also search for an existing PW lock.  The
2655          * VFS and page cache already protect us locally, so lots of readers/
2656          * writers can share a single PW lock. */
2657         rc = mode;
2658         if (mode == LCK_PR)
2659                 rc |= LCK_PW;
2660         rc = ldlm_lock_match(obd->obd_namespace, lflags,
2661                              res_id, type, policy, rc, lockh, unref);
2662         if (rc == 0 || lflags & LDLM_FL_TEST_LOCK)
2663                 RETURN(rc);
2664
2665         if (data != NULL) {
2666                 struct ldlm_lock *lock = ldlm_handle2lock(lockh);
2667
2668                 LASSERT(lock != NULL);
2669                 if (!osc_set_lock_data(lock, data)) {
2670                         ldlm_lock_decref(lockh, rc);
2671                         rc = 0;
2672                 }
2673                 LDLM_LOCK_PUT(lock);
2674         }
2675         RETURN(rc);
2676 }
2677
2678 static int osc_statfs_interpret(const struct lu_env *env,
2679                                 struct ptlrpc_request *req,
2680                                 struct osc_async_args *aa, int rc)
2681 {
2682         struct obd_statfs *msfs;
2683         ENTRY;
2684
2685         if (rc == -EBADR)
2686                 /* The request has in fact never been sent
2687                  * due to issues at a higher level (LOV).
2688                  * Exit immediately since the caller is
2689                  * aware of the problem and takes care
2690                  * of the clean up */
2691                  RETURN(rc);
2692
2693         if ((rc == -ENOTCONN || rc == -EAGAIN) &&
2694             (aa->aa_oi->oi_flags & OBD_STATFS_NODELAY))
2695                 GOTO(out, rc = 0);
2696
2697         if (rc != 0)
2698                 GOTO(out, rc);
2699
2700         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
2701         if (msfs == NULL) {
2702                 GOTO(out, rc = -EPROTO);
2703         }
2704
2705         *aa->aa_oi->oi_osfs = *msfs;
2706 out:
2707         rc = aa->aa_oi->oi_cb_up(aa->aa_oi, rc);
2708         RETURN(rc);
2709 }
2710
2711 static int osc_statfs_async(struct obd_export *exp,
2712                             struct obd_info *oinfo, time64_t max_age,
2713                             struct ptlrpc_request_set *rqset)
2714 {
2715         struct obd_device     *obd = class_exp2obd(exp);
2716         struct ptlrpc_request *req;
2717         struct osc_async_args *aa;
2718         int rc;
2719         ENTRY;
2720
2721         /* We could possibly pass max_age in the request (as an absolute
2722          * timestamp or a "seconds.usec ago") so the target can avoid doing
2723          * extra calls into the filesystem if that isn't necessary (e.g.
2724          * during mount that would help a bit).  Having relative timestamps
2725          * is not so great if request processing is slow, while absolute
2726          * timestamps are not ideal because they need time synchronization. */
2727         req = ptlrpc_request_alloc(obd->u.cli.cl_import, &RQF_OST_STATFS);
2728         if (req == NULL)
2729                 RETURN(-ENOMEM);
2730
2731         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_STATFS);
2732         if (rc) {
2733                 ptlrpc_request_free(req);
2734                 RETURN(rc);
2735         }
2736         ptlrpc_request_set_replen(req);
2737         req->rq_request_portal = OST_CREATE_PORTAL;
2738         ptlrpc_at_set_req_timeout(req);
2739
2740         if (oinfo->oi_flags & OBD_STATFS_NODELAY) {
2741                 /* procfs requests not want stat in wait for avoid deadlock */
2742                 req->rq_no_resend = 1;
2743                 req->rq_no_delay = 1;
2744         }
2745
2746         req->rq_interpret_reply = (ptlrpc_interpterer_t)osc_statfs_interpret;
2747         CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
2748         aa = ptlrpc_req_async_args(req);
2749         aa->aa_oi = oinfo;
2750
2751         ptlrpc_set_add_req(rqset, req);
2752         RETURN(0);
2753 }
2754
2755 static int osc_statfs(const struct lu_env *env, struct obd_export *exp,
2756                       struct obd_statfs *osfs, time64_t max_age, __u32 flags)
2757 {
2758         struct obd_device     *obd = class_exp2obd(exp);
2759         struct obd_statfs     *msfs;
2760         struct ptlrpc_request *req;
2761         struct obd_import     *imp = NULL;
2762         int rc;
2763         ENTRY;
2764
2765
2766         /*Since the request might also come from lprocfs, so we need
2767          *sync this with client_disconnect_export Bug15684*/
2768         down_read(&obd->u.cli.cl_sem);
2769         if (obd->u.cli.cl_import)
2770                 imp = class_import_get(obd->u.cli.cl_import);
2771         up_read(&obd->u.cli.cl_sem);
2772         if (!imp)
2773                 RETURN(-ENODEV);
2774
2775         /* We could possibly pass max_age in the request (as an absolute
2776          * timestamp or a "seconds.usec ago") so the target can avoid doing
2777          * extra calls into the filesystem if that isn't necessary (e.g.
2778          * during mount that would help a bit).  Having relative timestamps
2779          * is not so great if request processing is slow, while absolute
2780          * timestamps are not ideal because they need time synchronization. */
2781         req = ptlrpc_request_alloc(imp, &RQF_OST_STATFS);
2782
2783         class_import_put(imp);
2784
2785         if (req == NULL)
2786                 RETURN(-ENOMEM);
2787
2788         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_STATFS);
2789         if (rc) {
2790                 ptlrpc_request_free(req);
2791                 RETURN(rc);
2792         }
2793         ptlrpc_request_set_replen(req);
2794         req->rq_request_portal = OST_CREATE_PORTAL;
2795         ptlrpc_at_set_req_timeout(req);
2796
2797         if (flags & OBD_STATFS_NODELAY) {
2798                 /* procfs requests not want stat in wait for avoid deadlock */
2799                 req->rq_no_resend = 1;
2800                 req->rq_no_delay = 1;
2801         }
2802
2803         rc = ptlrpc_queue_wait(req);
2804         if (rc)
2805                 GOTO(out, rc);
2806
2807         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
2808         if (msfs == NULL)
2809                 GOTO(out, rc = -EPROTO);
2810
2811         *osfs = *msfs;
2812
2813         EXIT;
2814 out:
2815         ptlrpc_req_finished(req);
2816         return rc;
2817 }
2818
2819 static int osc_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
2820                          void *karg, void __user *uarg)
2821 {
2822         struct obd_device *obd = exp->exp_obd;
2823         struct obd_ioctl_data *data = karg;
2824         int err = 0;
2825         ENTRY;
2826
2827         if (!try_module_get(THIS_MODULE)) {
2828                 CERROR("%s: cannot get module '%s'\n", obd->obd_name,
2829                        module_name(THIS_MODULE));
2830                 return -EINVAL;
2831         }
2832         switch (cmd) {
2833         case OBD_IOC_CLIENT_RECOVER:
2834                 err = ptlrpc_recover_import(obd->u.cli.cl_import,
2835                                             data->ioc_inlbuf1, 0);
2836                 if (err > 0)
2837                         err = 0;
2838                 GOTO(out, err);
2839         case IOC_OSC_SET_ACTIVE:
2840                 err = ptlrpc_set_import_active(obd->u.cli.cl_import,
2841                                                data->ioc_offset);
2842                 GOTO(out, err);
2843         case OBD_IOC_PING_TARGET:
2844                 err = ptlrpc_obd_ping(obd);
2845                 GOTO(out, err);
2846         default:
2847                 CDEBUG(D_INODE, "unrecognised ioctl %#x by %s\n",
2848                        cmd, current_comm());
2849                 GOTO(out, err = -ENOTTY);
2850         }
2851 out:
2852         module_put(THIS_MODULE);
2853         return err;
2854 }
2855
2856 int osc_set_info_async(const struct lu_env *env, struct obd_export *exp,
2857                        u32 keylen, void *key, u32 vallen, void *val,
2858                        struct ptlrpc_request_set *set)
2859 {
2860         struct ptlrpc_request *req;
2861         struct obd_device     *obd = exp->exp_obd;
2862         struct obd_import     *imp = class_exp2cliimp(exp);
2863         char                  *tmp;
2864         int                    rc;
2865         ENTRY;
2866
2867         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_SHUTDOWN, 10);
2868
2869         if (KEY_IS(KEY_CHECKSUM)) {
2870                 if (vallen != sizeof(int))
2871                         RETURN(-EINVAL);
2872                 exp->exp_obd->u.cli.cl_checksum = (*(int *)val) ? 1 : 0;
2873                 RETURN(0);
2874         }
2875
2876         if (KEY_IS(KEY_SPTLRPC_CONF)) {
2877                 sptlrpc_conf_client_adapt(obd);
2878                 RETURN(0);
2879         }
2880
2881         if (KEY_IS(KEY_FLUSH_CTX)) {
2882                 sptlrpc_import_flush_my_ctx(imp);
2883                 RETURN(0);
2884         }
2885
2886         if (KEY_IS(KEY_CACHE_SET)) {
2887                 struct client_obd *cli = &obd->u.cli;
2888
2889                 LASSERT(cli->cl_cache == NULL); /* only once */
2890                 cli->cl_cache = (struct cl_client_cache *)val;
2891                 cl_cache_incref(cli->cl_cache);
2892                 cli->cl_lru_left = &cli->cl_cache->ccc_lru_left;
2893
2894                 /* add this osc into entity list */
2895                 LASSERT(list_empty(&cli->cl_lru_osc));
2896                 spin_lock(&cli->cl_cache->ccc_lru_lock);
2897                 list_add(&cli->cl_lru_osc, &cli->cl_cache->ccc_lru);
2898                 spin_unlock(&cli->cl_cache->ccc_lru_lock);
2899
2900                 RETURN(0);
2901         }
2902
2903         if (KEY_IS(KEY_CACHE_LRU_SHRINK)) {
2904                 struct client_obd *cli = &obd->u.cli;
2905                 long nr = atomic_long_read(&cli->cl_lru_in_list) >> 1;
2906                 long target = *(long *)val;
2907
2908                 nr = osc_lru_shrink(env, cli, min(nr, target), true);
2909                 *(long *)val -= nr;
2910                 RETURN(0);
2911         }
2912
2913         if (!set && !KEY_IS(KEY_GRANT_SHRINK))
2914                 RETURN(-EINVAL);
2915
2916         /* We pass all other commands directly to OST. Since nobody calls osc
2917            methods directly and everybody is supposed to go through LOV, we
2918            assume lov checked invalid values for us.
2919            The only recognised values so far are evict_by_nid and mds_conn.
2920            Even if something bad goes through, we'd get a -EINVAL from OST
2921            anyway. */
2922
2923         req = ptlrpc_request_alloc(imp, KEY_IS(KEY_GRANT_SHRINK) ?
2924                                                 &RQF_OST_SET_GRANT_INFO :
2925                                                 &RQF_OBD_SET_INFO);
2926         if (req == NULL)
2927                 RETURN(-ENOMEM);
2928
2929         req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_KEY,
2930                              RCL_CLIENT, keylen);
2931         if (!KEY_IS(KEY_GRANT_SHRINK))
2932                 req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_VAL,
2933                                      RCL_CLIENT, vallen);
2934         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SET_INFO);
2935         if (rc) {
2936                 ptlrpc_request_free(req);
2937                 RETURN(rc);
2938         }
2939
2940         tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
2941         memcpy(tmp, key, keylen);
2942         tmp = req_capsule_client_get(&req->rq_pill, KEY_IS(KEY_GRANT_SHRINK) ?
2943                                                         &RMF_OST_BODY :
2944                                                         &RMF_SETINFO_VAL);
2945         memcpy(tmp, val, vallen);
2946
2947         if (KEY_IS(KEY_GRANT_SHRINK)) {
2948                 struct osc_grant_args *aa;
2949                 struct obdo *oa;
2950
2951                 CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
2952                 aa = ptlrpc_req_async_args(req);
2953                 OBD_SLAB_ALLOC_PTR_GFP(oa, osc_obdo_kmem, GFP_NOFS);
2954                 if (!oa) {
2955                         ptlrpc_req_finished(req);
2956                         RETURN(-ENOMEM);
2957                 }
2958                 *oa = ((struct ost_body *)val)->oa;
2959                 aa->aa_oa = oa;
2960                 req->rq_interpret_reply = osc_shrink_grant_interpret;
2961         }
2962
2963         ptlrpc_request_set_replen(req);
2964         if (!KEY_IS(KEY_GRANT_SHRINK)) {
2965                 LASSERT(set != NULL);
2966                 ptlrpc_set_add_req(set, req);
2967                 ptlrpc_check_set(NULL, set);
2968         } else {
2969                 ptlrpcd_add_req(req);
2970         }
2971
2972         RETURN(0);
2973 }
2974 EXPORT_SYMBOL(osc_set_info_async);
2975
2976 int osc_reconnect(const struct lu_env *env, struct obd_export *exp,
2977                   struct obd_device *obd, struct obd_uuid *cluuid,
2978                   struct obd_connect_data *data, void *localdata)
2979 {
2980         struct client_obd *cli = &obd->u.cli;
2981
2982         if (data != NULL && (data->ocd_connect_flags & OBD_CONNECT_GRANT)) {
2983                 long lost_grant;
2984                 long grant;
2985
2986                 spin_lock(&cli->cl_loi_list_lock);
2987                 grant = cli->cl_avail_grant + cli->cl_reserved_grant;
2988                 if (data->ocd_connect_flags & OBD_CONNECT_GRANT_PARAM)
2989                         grant += cli->cl_dirty_grant;
2990                 else
2991                         grant += cli->cl_dirty_pages << PAGE_SHIFT;
2992                 data->ocd_grant = grant ? : 2 * cli_brw_size(obd);
2993                 lost_grant = cli->cl_lost_grant;
2994                 cli->cl_lost_grant = 0;
2995                 spin_unlock(&cli->cl_loi_list_lock);
2996
2997                 CDEBUG(D_RPCTRACE, "ocd_connect_flags: %#llx ocd_version: %d"
2998                        " ocd_grant: %d, lost: %ld.\n", data->ocd_connect_flags,
2999                        data->ocd_version, data->ocd_grant, lost_grant);
3000         }
3001
3002         RETURN(0);
3003 }
3004 EXPORT_SYMBOL(osc_reconnect);
3005
3006 int osc_disconnect(struct obd_export *exp)
3007 {
3008         struct obd_device *obd = class_exp2obd(exp);
3009         int rc;
3010
3011         rc = client_disconnect_export(exp);
3012         /**
3013          * Initially we put del_shrink_grant before disconnect_export, but it
3014          * causes the following problem if setup (connect) and cleanup
3015          * (disconnect) are tangled together.
3016          *      connect p1                     disconnect p2
3017          *   ptlrpc_connect_import
3018          *     ...............               class_manual_cleanup
3019          *                                     osc_disconnect
3020          *                                     del_shrink_grant
3021          *   ptlrpc_connect_interrupt
3022          *     osc_init_grant
3023          *   add this client to shrink list
3024          *                                      cleanup_osc
3025          * Bang! grant shrink thread trigger the shrink. BUG18662
3026          */
3027         osc_del_grant_list(&obd->u.cli);
3028         return rc;
3029 }
3030 EXPORT_SYMBOL(osc_disconnect);
3031
3032 int osc_ldlm_resource_invalidate(struct cfs_hash *hs, struct cfs_hash_bd *bd,
3033                                  struct hlist_node *hnode, void *arg)
3034 {
3035         struct lu_env *env = arg;
3036         struct ldlm_resource *res = cfs_hash_object(hs, hnode);
3037         struct ldlm_lock *lock;
3038         struct osc_object *osc = NULL;
3039         ENTRY;
3040
3041         lock_res(res);
3042         list_for_each_entry(lock, &res->lr_granted, l_res_link) {
3043                 if (lock->l_ast_data != NULL && osc == NULL) {
3044                         osc = lock->l_ast_data;
3045                         cl_object_get(osc2cl(osc));
3046                 }
3047
3048                 /* clear LDLM_FL_CLEANED flag to make sure it will be canceled
3049                  * by the 2nd round of ldlm_namespace_clean() call in
3050                  * osc_import_event(). */
3051                 ldlm_clear_cleaned(lock);
3052         }
3053         unlock_res(res);
3054
3055         if (osc != NULL) {
3056                 osc_object_invalidate(env, osc);
3057                 cl_object_put(env, osc2cl(osc));
3058         }
3059
3060         RETURN(0);
3061 }
3062 EXPORT_SYMBOL(osc_ldlm_resource_invalidate);
3063
3064 static int osc_import_event(struct obd_device *obd,
3065                             struct obd_import *imp,
3066                             enum obd_import_event event)
3067 {
3068         struct client_obd *cli;
3069         int rc = 0;
3070
3071         ENTRY;
3072         LASSERT(imp->imp_obd == obd);
3073
3074         switch (event) {
3075         case IMP_EVENT_DISCON: {
3076                 cli = &obd->u.cli;
3077                 spin_lock(&cli->cl_loi_list_lock);
3078                 cli->cl_avail_grant = 0;
3079                 cli->cl_lost_grant = 0;
3080                 spin_unlock(&cli->cl_loi_list_lock);
3081                 break;
3082         }
3083         case IMP_EVENT_INACTIVE: {
3084                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_INACTIVE);
3085                 break;
3086         }
3087         case IMP_EVENT_INVALIDATE: {
3088                 struct ldlm_namespace *ns = obd->obd_namespace;
3089                 struct lu_env         *env;
3090                 __u16                  refcheck;
3091
3092                 ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
3093
3094                 env = cl_env_get(&refcheck);
3095                 if (!IS_ERR(env)) {
3096                         osc_io_unplug(env, &obd->u.cli, NULL);
3097
3098                         cfs_hash_for_each_nolock(ns->ns_rs_hash,
3099                                                  osc_ldlm_resource_invalidate,
3100                                                  env, 0);
3101                         cl_env_put(env, &refcheck);
3102
3103                         ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
3104                 } else
3105                         rc = PTR_ERR(env);
3106                 break;
3107         }
3108         case IMP_EVENT_ACTIVE: {
3109                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_ACTIVE);
3110                 break;
3111         }
3112         case IMP_EVENT_OCD: {
3113                 struct obd_connect_data *ocd = &imp->imp_connect_data;
3114
3115                 if (ocd->ocd_connect_flags & OBD_CONNECT_GRANT)
3116                         osc_init_grant(&obd->u.cli, ocd);
3117
3118                 /* See bug 7198 */
3119                 if (ocd->ocd_connect_flags & OBD_CONNECT_REQPORTAL)
3120                         imp->imp_client->cli_request_portal =OST_REQUEST_PORTAL;
3121
3122                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_OCD);
3123                 break;
3124         }
3125         case IMP_EVENT_DEACTIVATE: {
3126                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_DEACTIVATE);
3127                 break;
3128         }
3129         case IMP_EVENT_ACTIVATE: {
3130                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_ACTIVATE);
3131                 break;
3132         }
3133         default:
3134                 CERROR("Unknown import event %d\n", event);
3135                 LBUG();
3136         }
3137         RETURN(rc);
3138 }
3139
3140 /**
3141  * Determine whether the lock can be canceled before replaying the lock
3142  * during recovery, see bug16774 for detailed information.
3143  *
3144  * \retval zero the lock can't be canceled
3145  * \retval other ok to cancel
3146  */
3147 static int osc_cancel_weight(struct ldlm_lock *lock)
3148 {
3149         /*
3150          * Cancel all unused and granted extent lock.
3151          */
3152         if (lock->l_resource->lr_type == LDLM_EXTENT &&
3153             lock->l_granted_mode == lock->l_req_mode &&
3154             osc_ldlm_weigh_ast(lock) == 0)
3155                 RETURN(1);
3156
3157         RETURN(0);
3158 }
3159
3160 static int brw_queue_work(const struct lu_env *env, void *data)
3161 {
3162         struct client_obd *cli = data;
3163
3164         CDEBUG(D_CACHE, "Run writeback work for client obd %p.\n", cli);
3165
3166         osc_io_unplug(env, cli, NULL);
3167         RETURN(0);
3168 }
3169
3170 int osc_setup_common(struct obd_device *obd, struct lustre_cfg *lcfg)
3171 {
3172         struct client_obd *cli = &obd->u.cli;
3173         void *handler;
3174         int rc;
3175
3176         ENTRY;
3177
3178         rc = ptlrpcd_addref();
3179         if (rc)
3180                 RETURN(rc);
3181
3182         rc = client_obd_setup(obd, lcfg);
3183         if (rc)
3184                 GOTO(out_ptlrpcd, rc);
3185
3186
3187         handler = ptlrpcd_alloc_work(cli->cl_import, brw_queue_work, cli);
3188         if (IS_ERR(handler))
3189                 GOTO(out_ptlrpcd_work, rc = PTR_ERR(handler));
3190         cli->cl_writeback_work = handler;
3191
3192         handler = ptlrpcd_alloc_work(cli->cl_import, lru_queue_work, cli);
3193         if (IS_ERR(handler))
3194                 GOTO(out_ptlrpcd_work, rc = PTR_ERR(handler));
3195         cli->cl_lru_work = handler;
3196
3197         rc = osc_quota_setup(obd);
3198         if (rc)
3199                 GOTO(out_ptlrpcd_work, rc);
3200
3201         cli->cl_grant_shrink_interval = GRANT_SHRINK_INTERVAL;
3202         osc_update_next_shrink(cli);
3203
3204         RETURN(rc);
3205
3206 out_ptlrpcd_work:
3207         if (cli->cl_writeback_work != NULL) {
3208                 ptlrpcd_destroy_work(cli->cl_writeback_work);
3209                 cli->cl_writeback_work = NULL;
3210         }
3211         if (cli->cl_lru_work != NULL) {
3212                 ptlrpcd_destroy_work(cli->cl_lru_work);
3213                 cli->cl_lru_work = NULL;
3214         }
3215         client_obd_cleanup(obd);
3216 out_ptlrpcd:
3217         ptlrpcd_decref();
3218         RETURN(rc);
3219 }
3220 EXPORT_SYMBOL(osc_setup_common);
3221
3222 int osc_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
3223 {
3224         struct client_obd *cli = &obd->u.cli;
3225         int                adding;
3226         int                added;
3227         int                req_count;
3228         int                rc;
3229
3230         ENTRY;
3231
3232         rc = osc_setup_common(obd, lcfg);
3233         if (rc < 0)
3234                 RETURN(rc);
3235
3236         rc = osc_tunables_init(obd);
3237         if (rc)
3238                 RETURN(rc);
3239
3240         /*
3241          * We try to control the total number of requests with a upper limit
3242          * osc_reqpool_maxreqcount. There might be some race which will cause
3243          * over-limit allocation, but it is fine.
3244          */
3245         req_count = atomic_read(&osc_pool_req_count);
3246         if (req_count < osc_reqpool_maxreqcount) {
3247                 adding = cli->cl_max_rpcs_in_flight + 2;
3248                 if (req_count + adding > osc_reqpool_maxreqcount)
3249                         adding = osc_reqpool_maxreqcount - req_count;
3250
3251                 added = ptlrpc_add_rqs_to_pool(osc_rq_pool, adding);
3252                 atomic_add(added, &osc_pool_req_count);
3253         }
3254
3255         ns_register_cancel(obd->obd_namespace, osc_cancel_weight);
3256
3257         spin_lock(&osc_shrink_lock);
3258         list_add_tail(&cli->cl_shrink_list, &osc_shrink_list);
3259         spin_unlock(&osc_shrink_lock);
3260         cli->cl_import->imp_idle_timeout = osc_idle_timeout;
3261         cli->cl_import->imp_idle_debug = D_HA;
3262
3263         RETURN(0);
3264 }
3265
3266 int osc_precleanup_common(struct obd_device *obd)
3267 {
3268         struct client_obd *cli = &obd->u.cli;
3269         ENTRY;
3270
3271         /* LU-464
3272          * for echo client, export may be on zombie list, wait for
3273          * zombie thread to cull it, because cli.cl_import will be
3274          * cleared in client_disconnect_export():
3275          *   class_export_destroy() -> obd_cleanup() ->
3276          *   echo_device_free() -> echo_client_cleanup() ->
3277          *   obd_disconnect() -> osc_disconnect() ->
3278          *   client_disconnect_export()
3279          */
3280         obd_zombie_barrier();
3281         if (cli->cl_writeback_work) {
3282                 ptlrpcd_destroy_work(cli->cl_writeback_work);
3283                 cli->cl_writeback_work = NULL;
3284         }
3285
3286         if (cli->cl_lru_work) {
3287                 ptlrpcd_destroy_work(cli->cl_lru_work);
3288                 cli->cl_lru_work = NULL;
3289         }
3290
3291         obd_cleanup_client_import(obd);
3292         RETURN(0);
3293 }
3294 EXPORT_SYMBOL(osc_precleanup_common);
3295
3296 static int osc_precleanup(struct obd_device *obd)
3297 {
3298         ENTRY;
3299
3300         osc_precleanup_common(obd);
3301
3302         ptlrpc_lprocfs_unregister_obd(obd);
3303         RETURN(0);
3304 }
3305
3306 int osc_cleanup_common(struct obd_device *obd)
3307 {
3308         struct client_obd *cli = &obd->u.cli;
3309         int rc;
3310
3311         ENTRY;
3312
3313         spin_lock(&osc_shrink_lock);
3314         list_del(&cli->cl_shrink_list);
3315         spin_unlock(&osc_shrink_lock);
3316
3317         /* lru cleanup */
3318         if (cli->cl_cache != NULL) {
3319                 LASSERT(atomic_read(&cli->cl_cache->ccc_users) > 0);
3320                 spin_lock(&cli->cl_cache->ccc_lru_lock);
3321                 list_del_init(&cli->cl_lru_osc);
3322                 spin_unlock(&cli->cl_cache->ccc_lru_lock);
3323                 cli->cl_lru_left = NULL;
3324                 cl_cache_decref(cli->cl_cache);
3325                 cli->cl_cache = NULL;
3326         }
3327
3328         /* free memory of osc quota cache */
3329         osc_quota_cleanup(obd);
3330
3331         rc = client_obd_cleanup(obd);
3332
3333         ptlrpcd_decref();
3334         RETURN(rc);
3335 }
3336 EXPORT_SYMBOL(osc_cleanup_common);
3337
3338 int osc_process_config_base(struct obd_device *obd, struct lustre_cfg *lcfg)
3339 {
3340         ssize_t count  = class_modify_config(lcfg, PARAM_OSC,
3341                                              &obd->obd_kset.kobj);
3342         return count > 0 ? 0 : count;
3343 }
3344
3345 static int osc_process_config(struct obd_device *obd, size_t len, void *buf)
3346 {
3347         return osc_process_config_base(obd, buf);
3348 }
3349
3350 static struct obd_ops osc_obd_ops = {
3351         .o_owner                = THIS_MODULE,
3352         .o_setup                = osc_setup,
3353         .o_precleanup           = osc_precleanup,
3354         .o_cleanup              = osc_cleanup_common,
3355         .o_add_conn             = client_import_add_conn,
3356         .o_del_conn             = client_import_del_conn,
3357         .o_connect              = client_connect_import,
3358         .o_reconnect            = osc_reconnect,
3359         .o_disconnect           = osc_disconnect,
3360         .o_statfs               = osc_statfs,
3361         .o_statfs_async         = osc_statfs_async,
3362         .o_create               = osc_create,
3363         .o_destroy              = osc_destroy,
3364         .o_getattr              = osc_getattr,
3365         .o_setattr              = osc_setattr,
3366         .o_iocontrol            = osc_iocontrol,
3367         .o_set_info_async       = osc_set_info_async,
3368         .o_import_event         = osc_import_event,
3369         .o_process_config       = osc_process_config,
3370         .o_quotactl             = osc_quotactl,
3371 };
3372
3373 static struct shrinker *osc_cache_shrinker;
3374 struct list_head osc_shrink_list = LIST_HEAD_INIT(osc_shrink_list);
3375 DEFINE_SPINLOCK(osc_shrink_lock);
3376
3377 #ifndef HAVE_SHRINKER_COUNT
3378 static int osc_cache_shrink(SHRINKER_ARGS(sc, nr_to_scan, gfp_mask))
3379 {
3380         struct shrink_control scv = {
3381                 .nr_to_scan = shrink_param(sc, nr_to_scan),
3382                 .gfp_mask   = shrink_param(sc, gfp_mask)
3383         };
3384 #if !defined(HAVE_SHRINKER_WANT_SHRINK_PTR) && !defined(HAVE_SHRINK_CONTROL)
3385         struct shrinker *shrinker = NULL;
3386 #endif
3387
3388         (void)osc_cache_shrink_scan(shrinker, &scv);
3389
3390         return osc_cache_shrink_count(shrinker, &scv);
3391 }
3392 #endif
3393
3394 static int __init osc_init(void)
3395 {
3396         bool enable_proc = true;
3397         struct obd_type *type;
3398         unsigned int reqpool_size;
3399         unsigned int reqsize;
3400         int rc;
3401         DEF_SHRINKER_VAR(osc_shvar, osc_cache_shrink,
3402                          osc_cache_shrink_count, osc_cache_shrink_scan);
3403         ENTRY;
3404
3405         /* print an address of _any_ initialized kernel symbol from this
3406          * module, to allow debugging with gdb that doesn't support data
3407          * symbols from modules.*/
3408         CDEBUG(D_INFO, "Lustre OSC module (%p).\n", &osc_caches);
3409
3410         rc = lu_kmem_init(osc_caches);
3411         if (rc)
3412                 RETURN(rc);
3413
3414         type = class_search_type(LUSTRE_OSP_NAME);
3415         if (type != NULL && type->typ_procsym != NULL)
3416                 enable_proc = false;
3417
3418         rc = class_register_type(&osc_obd_ops, NULL, enable_proc, NULL,
3419                                  LUSTRE_OSC_NAME, &osc_device_type);
3420         if (rc)
3421                 GOTO(out_kmem, rc);
3422
3423         osc_cache_shrinker = set_shrinker(DEFAULT_SEEKS, &osc_shvar);
3424
3425         /* This is obviously too much memory, only prevent overflow here */
3426         if (osc_reqpool_mem_max >= 1 << 12 || osc_reqpool_mem_max == 0)
3427                 GOTO(out_type, rc = -EINVAL);
3428
3429         reqpool_size = osc_reqpool_mem_max << 20;
3430
3431         reqsize = 1;
3432         while (reqsize < OST_IO_MAXREQSIZE)
3433                 reqsize = reqsize << 1;
3434
3435         /*
3436          * We don't enlarge the request count in OSC pool according to
3437          * cl_max_rpcs_in_flight. The allocation from the pool will only be
3438          * tried after normal allocation failed. So a small OSC pool won't
3439          * cause much performance degression in most of cases.
3440          */
3441         osc_reqpool_maxreqcount = reqpool_size / reqsize;
3442
3443         atomic_set(&osc_pool_req_count, 0);
3444         osc_rq_pool = ptlrpc_init_rq_pool(0, OST_IO_MAXREQSIZE,
3445                                           ptlrpc_add_rqs_to_pool);
3446
3447         if (osc_rq_pool == NULL)
3448                 GOTO(out_type, rc = -ENOMEM);
3449
3450         rc = osc_start_grant_work();
3451         if (rc != 0)
3452                 GOTO(out_req_pool, rc);
3453
3454         RETURN(rc);
3455
3456 out_req_pool:
3457         ptlrpc_free_rq_pool(osc_rq_pool);
3458 out_type:
3459         class_unregister_type(LUSTRE_OSC_NAME);
3460 out_kmem:
3461         lu_kmem_fini(osc_caches);
3462
3463         RETURN(rc);
3464 }
3465
3466 static void __exit osc_exit(void)
3467 {
3468         osc_stop_grant_work();
3469         remove_shrinker(osc_cache_shrinker);
3470         class_unregister_type(LUSTRE_OSC_NAME);
3471         lu_kmem_fini(osc_caches);
3472         ptlrpc_free_rq_pool(osc_rq_pool);
3473 }
3474
3475 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
3476 MODULE_DESCRIPTION("Lustre Object Storage Client (OSC)");
3477 MODULE_VERSION(LUSTRE_VERSION_STRING);
3478 MODULE_LICENSE("GPL");
3479
3480 module_init(osc_init);
3481 module_exit(osc_exit);