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 <obd.h>
  45 #include <obd_cksum.h>
  46 #include <obd_class.h>
  47 #include <lustre_osc.h>
  48
  49 #include "osc_internal.h"
  50
  51 atomic_t osc_pool_req_count;
  52 unsigned int osc_reqpool_maxreqcount;
  53 struct ptlrpc_request_pool *osc_rq_pool;
  54
  55 /* max memory used for request pool, unit is MB */
  56 static unsigned int osc_reqpool_mem_max = 5;
  57 module_param(osc_reqpool_mem_max, uint, 0444);
  58
  59 static int osc_idle_timeout = 20;
  60 module_param(osc_idle_timeout, uint, 0644);
  61
  62 #define osc_grant_args osc_brw_async_args
  63
  64 struct osc_setattr_args {
  65         struct obdo             *sa_oa;
  66         obd_enqueue_update_f     sa_upcall;
  67         void                    *sa_cookie;
  68 };
  69
  70 struct osc_fsync_args {
  71         struct osc_object       *fa_obj;
  72         struct obdo             *fa_oa;
  73         obd_enqueue_update_f    fa_upcall;
  74         void                    *fa_cookie;
  75 };
  76
  77 struct osc_ladvise_args {
  78         struct obdo             *la_oa;
  79         obd_enqueue_update_f     la_upcall;
  80         void                    *la_cookie;
  81 };
  82
  83 static void osc_release_ppga(struct brw_page **ppga, size_t count);
  84 static int brw_interpret(const struct lu_env *env, struct ptlrpc_request *req,
  85                          void *data, int rc);
  86
  87 void osc_pack_req_body(struct ptlrpc_request *req, struct obdo *oa)
  88 {
  89         struct ost_body *body;
  90
  91         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
  92         LASSERT(body);
  93
  94         lustre_set_wire_obdo(&req->rq_import->imp_connect_data, &body->oa, oa);
  95 }
  96
  97 static int osc_getattr(const struct lu_env *env, struct obd_export *exp,
  98                        struct obdo *oa)
  99 {
 100         struct ptlrpc_request   *req;
 101         struct ost_body         *body;
 102         int                      rc;
 103
 104         ENTRY;
 105         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_GETATTR);
 106         if (req == NULL)
 107                 RETURN(-ENOMEM);
 108
 109         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GETATTR);
 110         if (rc) {
 111                 ptlrpc_request_free(req);
 112                 RETURN(rc);
 113         }
 114
 115         osc_pack_req_body(req, oa);
 116
 117         ptlrpc_request_set_replen(req);
 118
 119         rc = ptlrpc_queue_wait(req);
 120         if (rc)
 121                 GOTO(out, rc);
 122
 123         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 124         if (body == NULL)
 125                 GOTO(out, rc = -EPROTO);
 126
 127         CDEBUG(D_INODE, "mode: %o\n", body->oa.o_mode);
 128         lustre_get_wire_obdo(&req->rq_import->imp_connect_data, oa, &body->oa);
 129
 130         oa->o_blksize = cli_brw_size(exp->exp_obd);
 131         oa->o_valid |= OBD_MD_FLBLKSZ;
 132
 133         EXIT;
 134 out:
 135         ptlrpc_req_finished(req);
 136
 137         return rc;
 138 }
 139
 140 static int osc_setattr(const struct lu_env *env, struct obd_export *exp,
 141                        struct obdo *oa)
 142 {
 143         struct ptlrpc_request   *req;
 144         struct ost_body         *body;
 145         int                      rc;
 146
 147         ENTRY;
 148         LASSERT(oa->o_valid & OBD_MD_FLGROUP);
 149
 150         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_SETATTR);
 151         if (req == NULL)
 152                 RETURN(-ENOMEM);
 153
 154         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SETATTR);
 155         if (rc) {
 156                 ptlrpc_request_free(req);
 157                 RETURN(rc);
 158         }
 159
 160         osc_pack_req_body(req, oa);
 161
 162         ptlrpc_request_set_replen(req);
 163
 164         rc = ptlrpc_queue_wait(req);
 165         if (rc)
 166                 GOTO(out, rc);
 167
 168         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 169         if (body == NULL)
 170                 GOTO(out, rc = -EPROTO);
 171
 172         lustre_get_wire_obdo(&req->rq_import->imp_connect_data, oa, &body->oa);
 173
 174         EXIT;
 175 out:
 176         ptlrpc_req_finished(req);
 177
 178         RETURN(rc);
 179 }
 180
 181 static int osc_setattr_interpret(const struct lu_env *env,
 182                                  struct ptlrpc_request *req, void *args, int rc)
 183 {
 184         struct osc_setattr_args *sa = args;
 185         struct ost_body *body;
 186
 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 = osc_setattr_interpret;
 233
 234                 sa = ptlrpc_req_async_args(sa, req);
 235                 sa->sa_oa = oa;
 236                 sa->sa_upcall = upcall;
 237                 sa->sa_cookie = cookie;
 238
 239                 if (rqset == PTLRPCD_SET)
 240                         ptlrpcd_add_req(req);
 241                 else
 242                         ptlrpc_set_add_req(rqset, req);
 243         }
 244
 245         RETURN(0);
 246 }
 247
 248 static int osc_ladvise_interpret(const struct lu_env *env,
 249                                  struct ptlrpc_request *req,
 250                                  void *arg, int rc)
 251 {
 252         struct osc_ladvise_args *la = arg;
 253         struct ost_body *body;
 254         ENTRY;
 255
 256         if (rc != 0)
 257                 GOTO(out, rc);
 258
 259         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 260         if (body == NULL)
 261                 GOTO(out, rc = -EPROTO);
 262
 263         *la->la_oa = body->oa;
 264 out:
 265         rc = la->la_upcall(la->la_cookie, rc);
 266         RETURN(rc);
 267 }
 268
 269 /**
 270  * If rqset is NULL, do not wait for response. Upcall and cookie could also
 271  * be NULL in this case
 272  */
 273 int osc_ladvise_base(struct obd_export *exp, struct obdo *oa,
 274                      struct ladvise_hdr *ladvise_hdr,
 275                      obd_enqueue_update_f upcall, void *cookie,
 276                      struct ptlrpc_request_set *rqset)
 277 {
 278         struct ptlrpc_request   *req;
 279         struct ost_body         *body;
 280         struct osc_ladvise_args *la;
 281         int                      rc;
 282         struct lu_ladvise       *req_ladvise;
 283         struct lu_ladvise       *ladvise = ladvise_hdr->lah_advise;
 284         int                      num_advise = ladvise_hdr->lah_count;
 285         struct ladvise_hdr      *req_ladvise_hdr;
 286         ENTRY;
 287
 288         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_LADVISE);
 289         if (req == NULL)
 290                 RETURN(-ENOMEM);
 291
 292         req_capsule_set_size(&req->rq_pill, &RMF_OST_LADVISE, RCL_CLIENT,
 293                              num_advise * sizeof(*ladvise));
 294         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_LADVISE);
 295         if (rc != 0) {
 296                 ptlrpc_request_free(req);
 297                 RETURN(rc);
 298         }
 299         req->rq_request_portal = OST_IO_PORTAL;
 300         ptlrpc_at_set_req_timeout(req);
 301
 302         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 303         LASSERT(body);
 304         lustre_set_wire_obdo(&req->rq_import->imp_connect_data, &body->oa,
 305                              oa);
 306
 307         req_ladvise_hdr = req_capsule_client_get(&req->rq_pill,
 308                                                  &RMF_OST_LADVISE_HDR);
 309         memcpy(req_ladvise_hdr, ladvise_hdr, sizeof(*ladvise_hdr));
 310
 311         req_ladvise = req_capsule_client_get(&req->rq_pill, &RMF_OST_LADVISE);
 312         memcpy(req_ladvise, ladvise, sizeof(*ladvise) * num_advise);
 313         ptlrpc_request_set_replen(req);
 314
 315         if (rqset == NULL) {
 316                 /* Do not wait for response. */
 317                 ptlrpcd_add_req(req);
 318                 RETURN(0);
 319         }
 320
 321         req->rq_interpret_reply = osc_ladvise_interpret;
 322         la = ptlrpc_req_async_args(la, req);
 323         la->la_oa = oa;
 324         la->la_upcall = upcall;
 325         la->la_cookie = cookie;
 326
 327         if (rqset == PTLRPCD_SET)
 328                 ptlrpcd_add_req(req);
 329         else
 330                 ptlrpc_set_add_req(rqset, req);
 331
 332         RETURN(0);
 333 }
 334
 335 static int osc_create(const struct lu_env *env, struct obd_export *exp,
 336                       struct obdo *oa)
 337 {
 338         struct ptlrpc_request *req;
 339         struct ost_body       *body;
 340         int                    rc;
 341         ENTRY;
 342
 343         LASSERT(oa != NULL);
 344         LASSERT(oa->o_valid & OBD_MD_FLGROUP);
 345         LASSERT(fid_seq_is_echo(ostid_seq(&oa->o_oi)));
 346
 347         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_CREATE);
 348         if (req == NULL)
 349                 GOTO(out, rc = -ENOMEM);
 350
 351         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_CREATE);
 352         if (rc) {
 353                 ptlrpc_request_free(req);
 354                 GOTO(out, rc);
 355         }
 356
 357         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 358         LASSERT(body);
 359
 360         lustre_set_wire_obdo(&req->rq_import->imp_connect_data, &body->oa, oa);
 361
 362         ptlrpc_request_set_replen(req);
 363
 364         rc = ptlrpc_queue_wait(req);
 365         if (rc)
 366                 GOTO(out_req, rc);
 367
 368         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 369         if (body == NULL)
 370                 GOTO(out_req, rc = -EPROTO);
 371
 372         CDEBUG(D_INFO, "oa flags %x\n", oa->o_flags);
 373         lustre_get_wire_obdo(&req->rq_import->imp_connect_data, oa, &body->oa);
 374
 375         oa->o_blksize = cli_brw_size(exp->exp_obd);
 376         oa->o_valid |= OBD_MD_FLBLKSZ;
 377
 378         CDEBUG(D_HA, "transno: %lld\n",
 379                lustre_msg_get_transno(req->rq_repmsg));
 380 out_req:
 381         ptlrpc_req_finished(req);
 382 out:
 383         RETURN(rc);
 384 }
 385
 386 int osc_punch_send(struct obd_export *exp, struct obdo *oa,
 387                    obd_enqueue_update_f upcall, void *cookie)
 388 {
 389         struct ptlrpc_request *req;
 390         struct osc_setattr_args *sa;
 391         struct obd_import *imp = class_exp2cliimp(exp);
 392         struct ost_body *body;
 393         int rc;
 394
 395         ENTRY;
 396
 397         req = ptlrpc_request_alloc(imp, &RQF_OST_PUNCH);
 398         if (req == NULL)
 399                 RETURN(-ENOMEM);
 400
 401         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_PUNCH);
 402         if (rc < 0) {
 403                 ptlrpc_request_free(req);
 404                 RETURN(rc);
 405         }
 406
 407         osc_set_io_portal(req);
 408
 409         ptlrpc_at_set_req_timeout(req);
 410
 411         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 412
 413         lustre_set_wire_obdo(&imp->imp_connect_data, &body->oa, oa);
 414
 415         ptlrpc_request_set_replen(req);
 416
 417         req->rq_interpret_reply = osc_setattr_interpret;
 418         sa = ptlrpc_req_async_args(sa, req);
 419         sa->sa_oa = oa;
 420         sa->sa_upcall = upcall;
 421         sa->sa_cookie = cookie;
 422
 423         ptlrpcd_add_req(req);
 424
 425         RETURN(0);
 426 }
 427 EXPORT_SYMBOL(osc_punch_send);
 428
 429 static int osc_sync_interpret(const struct lu_env *env,
 430                               struct ptlrpc_request *req, void *args, int rc)
 431 {
 432         struct osc_fsync_args *fa = args;
 433         struct ost_body *body;
 434         struct cl_attr *attr = &osc_env_info(env)->oti_attr;
 435         unsigned long valid = 0;
 436         struct cl_object *obj;
 437         ENTRY;
 438
 439         if (rc != 0)
 440                 GOTO(out, rc);
 441
 442         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 443         if (body == NULL) {
 444                 CERROR("can't unpack ost_body\n");
 445                 GOTO(out, rc = -EPROTO);
 446         }
 447
 448         *fa->fa_oa = body->oa;
 449         obj = osc2cl(fa->fa_obj);
 450
 451         /* Update osc object's blocks attribute */
 452         cl_object_attr_lock(obj);
 453         if (body->oa.o_valid & OBD_MD_FLBLOCKS) {
 454                 attr->cat_blocks = body->oa.o_blocks;
 455                 valid |= CAT_BLOCKS;
 456         }
 457
 458         if (valid != 0)
 459                 cl_object_attr_update(env, obj, attr, valid);
 460         cl_object_attr_unlock(obj);
 461
 462 out:
 463         rc = fa->fa_upcall(fa->fa_cookie, rc);
 464         RETURN(rc);
 465 }
 466
 467 int osc_sync_base(struct osc_object *obj, struct obdo *oa,
 468                   obd_enqueue_update_f upcall, void *cookie,
 469                   struct ptlrpc_request_set *rqset)
 470 {
 471         struct obd_export     *exp = osc_export(obj);
 472         struct ptlrpc_request *req;
 473         struct ost_body       *body;
 474         struct osc_fsync_args *fa;
 475         int                    rc;
 476         ENTRY;
 477
 478         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_SYNC);
 479         if (req == NULL)
 480                 RETURN(-ENOMEM);
 481
 482         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SYNC);
 483         if (rc) {
 484                 ptlrpc_request_free(req);
 485                 RETURN(rc);
 486         }
 487
 488         /* overload the size and blocks fields in the oa with start/end */
 489         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 490         LASSERT(body);
 491         lustre_set_wire_obdo(&req->rq_import->imp_connect_data, &body->oa, oa);
 492
 493         ptlrpc_request_set_replen(req);
 494         req->rq_interpret_reply = osc_sync_interpret;
 495
 496         fa = ptlrpc_req_async_args(fa, req);
 497         fa->fa_obj = obj;
 498         fa->fa_oa = oa;
 499         fa->fa_upcall = upcall;
 500         fa->fa_cookie = cookie;
 501
 502         if (rqset == PTLRPCD_SET)
 503                 ptlrpcd_add_req(req);
 504         else
 505                 ptlrpc_set_add_req(rqset, req);
 506
 507         RETURN (0);
 508 }
 509
 510 /* Find and cancel locally locks matched by @mode in the resource found by
 511  * @objid. Found locks are added into @cancel list. Returns the amount of
 512  * locks added to @cancels list. */
 513 static int osc_resource_get_unused(struct obd_export *exp, struct obdo *oa,
 514                                    struct list_head *cancels,
 515                                    enum ldlm_mode mode, __u64 lock_flags)
 516 {
 517         struct ldlm_namespace *ns = exp->exp_obd->obd_namespace;
 518         struct ldlm_res_id res_id;
 519         struct ldlm_resource *res;
 520         int count;
 521         ENTRY;
 522
 523         /* Return, i.e. cancel nothing, only if ELC is supported (flag in
 524          * export) but disabled through procfs (flag in NS).
 525          *
 526          * This distinguishes from a case when ELC is not supported originally,
 527          * when we still want to cancel locks in advance and just cancel them
 528          * locally, without sending any RPC. */
 529         if (exp_connect_cancelset(exp) && !ns_connect_cancelset(ns))
 530                 RETURN(0);
 531
 532         ostid_build_res_name(&oa->o_oi, &res_id);
 533         res = ldlm_resource_get(ns, NULL, &res_id, 0, 0);
 534         if (IS_ERR(res))
 535                 RETURN(0);
 536
 537         LDLM_RESOURCE_ADDREF(res);
 538         count = ldlm_cancel_resource_local(res, cancels, NULL, mode,
 539                                            lock_flags, 0, NULL);
 540         LDLM_RESOURCE_DELREF(res);
 541         ldlm_resource_putref(res);
 542         RETURN(count);
 543 }
 544
 545 static int osc_destroy_interpret(const struct lu_env *env,
 546                                  struct ptlrpc_request *req, void *args, int rc)
 547 {
 548         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
 549
 550         atomic_dec(&cli->cl_destroy_in_flight);
 551         wake_up(&cli->cl_destroy_waitq);
 552
 553         return 0;
 554 }
 555
 556 static int osc_can_send_destroy(struct client_obd *cli)
 557 {
 558         if (atomic_inc_return(&cli->cl_destroy_in_flight) <=
 559             cli->cl_max_rpcs_in_flight) {
 560                 /* The destroy request can be sent */
 561                 return 1;
 562         }
 563         if (atomic_dec_return(&cli->cl_destroy_in_flight) <
 564             cli->cl_max_rpcs_in_flight) {
 565                 /*
 566                  * The counter has been modified between the two atomic
 567                  * operations.
 568                  */
 569                 wake_up(&cli->cl_destroy_waitq);
 570         }
 571         return 0;
 572 }
 573
 574 static int osc_destroy(const struct lu_env *env, struct obd_export *exp,
 575                        struct obdo *oa)
 576 {
 577         struct client_obd     *cli = &exp->exp_obd->u.cli;
 578         struct ptlrpc_request *req;
 579         struct ost_body       *body;
 580         struct list_head       cancels = LIST_HEAD_INIT(cancels);
 581         int rc, count;
 582         ENTRY;
 583
 584         if (!oa) {
 585                 CDEBUG(D_INFO, "oa NULL\n");
 586                 RETURN(-EINVAL);
 587         }
 588
 589         count = osc_resource_get_unused(exp, oa, &cancels, LCK_PW,
 590                                         LDLM_FL_DISCARD_DATA);
 591
 592         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_DESTROY);
 593         if (req == NULL) {
 594                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
 595                 RETURN(-ENOMEM);
 596         }
 597
 598         rc = ldlm_prep_elc_req(exp, req, LUSTRE_OST_VERSION, OST_DESTROY,
 599                                0, &cancels, count);
 600         if (rc) {
 601                 ptlrpc_request_free(req);
 602                 RETURN(rc);
 603         }
 604
 605         req->rq_request_portal = OST_IO_PORTAL; /* bug 7198 */
 606         ptlrpc_at_set_req_timeout(req);
 607
 608         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 609         LASSERT(body);
 610         lustre_set_wire_obdo(&req->rq_import->imp_connect_data, &body->oa, oa);
 611
 612         ptlrpc_request_set_replen(req);
 613
 614         req->rq_interpret_reply = osc_destroy_interpret;
 615         if (!osc_can_send_destroy(cli)) {
 616                 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
 617
 618                 /*
 619                  * Wait until the number of on-going destroy RPCs drops
 620                  * under max_rpc_in_flight
 621                  */
 622                 rc = l_wait_event_exclusive(cli->cl_destroy_waitq,
 623                                             osc_can_send_destroy(cli), &lwi);
 624                 if (rc) {
 625                         ptlrpc_req_finished(req);
 626                         RETURN(rc);
 627                 }
 628         }
 629
 630         /* Do not wait for response */
 631         ptlrpcd_add_req(req);
 632         RETURN(0);
 633 }
 634
 635 static void osc_announce_cached(struct client_obd *cli, struct obdo *oa,
 636                                 long writing_bytes)
 637 {
 638         u64 bits = OBD_MD_FLBLOCKS | OBD_MD_FLGRANT;
 639
 640         LASSERT(!(oa->o_valid & bits));
 641
 642         oa->o_valid |= bits;
 643         spin_lock(&cli->cl_loi_list_lock);
 644         if (OCD_HAS_FLAG(&cli->cl_import->imp_connect_data, GRANT_PARAM))
 645                 oa->o_dirty = cli->cl_dirty_grant;
 646         else
 647                 oa->o_dirty = cli->cl_dirty_pages << PAGE_SHIFT;
 648         if (unlikely(cli->cl_dirty_pages - cli->cl_dirty_transit >
 649                      cli->cl_dirty_max_pages)) {
 650                 CERROR("dirty %lu - %lu > dirty_max %lu\n",
 651                        cli->cl_dirty_pages, cli->cl_dirty_transit,
 652                        cli->cl_dirty_max_pages);
 653                 oa->o_undirty = 0;
 654         } else if (unlikely(atomic_long_read(&obd_dirty_pages) -
 655                             atomic_long_read(&obd_dirty_transit_pages) >
 656                             (long)(obd_max_dirty_pages + 1))) {
 657                 /* The atomic_read() allowing the atomic_inc() are
 658                  * not covered by a lock thus they may safely race and trip
 659                  * this CERROR() unless we add in a small fudge factor (+1). */
 660                 CERROR("%s: dirty %ld - %ld > system dirty_max %ld\n",
 661                        cli_name(cli), atomic_long_read(&obd_dirty_pages),
 662                        atomic_long_read(&obd_dirty_transit_pages),
 663                        obd_max_dirty_pages);
 664                 oa->o_undirty = 0;
 665         } else if (unlikely(cli->cl_dirty_max_pages - cli->cl_dirty_pages >
 666                             0x7fffffff)) {
 667                 CERROR("dirty %lu - dirty_max %lu too big???\n",
 668                        cli->cl_dirty_pages, cli->cl_dirty_max_pages);
 669                 oa->o_undirty = 0;
 670         } else {
 671                 unsigned long nrpages;
 672                 unsigned long undirty;
 673
 674                 nrpages = cli->cl_max_pages_per_rpc;
 675                 nrpages *= cli->cl_max_rpcs_in_flight + 1;
 676                 nrpages = max(nrpages, cli->cl_dirty_max_pages);
 677                 undirty = nrpages << PAGE_SHIFT;
 678                 if (OCD_HAS_FLAG(&cli->cl_import->imp_connect_data,
 679                                  GRANT_PARAM)) {
 680                         int nrextents;
 681
 682                         /* take extent tax into account when asking for more
 683                          * grant space */
 684                         nrextents = (nrpages + cli->cl_max_extent_pages - 1)  /
 685                                      cli->cl_max_extent_pages;
 686                         undirty += nrextents * cli->cl_grant_extent_tax;
 687                 }
 688                 /* Do not ask for more than OBD_MAX_GRANT - a margin for server
 689                  * to add extent tax, etc.
 690                  */
 691                 oa->o_undirty = min(undirty, OBD_MAX_GRANT &
 692                                     ~(PTLRPC_MAX_BRW_SIZE * 4UL));
 693         }
 694         oa->o_grant = cli->cl_avail_grant + cli->cl_reserved_grant;
 695         oa->o_dropped = cli->cl_lost_grant;
 696         cli->cl_lost_grant = 0;
 697         spin_unlock(&cli->cl_loi_list_lock);
 698         CDEBUG(D_CACHE, "dirty: %llu undirty: %u dropped %u grant: %llu\n",
 699                oa->o_dirty, oa->o_undirty, oa->o_dropped, oa->o_grant);
 700 }
 701
 702 void osc_update_next_shrink(struct client_obd *cli)
 703 {
 704         cli->cl_next_shrink_grant = ktime_get_seconds() +
 705                                     cli->cl_grant_shrink_interval;
 706
 707         CDEBUG(D_CACHE, "next time %lld to shrink grant\n",
 708                cli->cl_next_shrink_grant);
 709 }
 710
 711 static void __osc_update_grant(struct client_obd *cli, u64 grant)
 712 {
 713         spin_lock(&cli->cl_loi_list_lock);
 714         cli->cl_avail_grant += grant;
 715         spin_unlock(&cli->cl_loi_list_lock);
 716 }
 717
 718 static void osc_update_grant(struct client_obd *cli, struct ost_body *body)
 719 {
 720         if (body->oa.o_valid & OBD_MD_FLGRANT) {
 721                 CDEBUG(D_CACHE, "got %llu extra grant\n", body->oa.o_grant);
 722                 __osc_update_grant(cli, body->oa.o_grant);
 723         }
 724 }
 725
 726 /**
 727  * grant thread data for shrinking space.
 728  */
 729 struct grant_thread_data {
 730         struct list_head        gtd_clients;
 731         struct mutex            gtd_mutex;
 732         unsigned long           gtd_stopped:1;
 733 };
 734 static struct grant_thread_data client_gtd;
 735
 736 static int osc_shrink_grant_interpret(const struct lu_env *env,
 737                                       struct ptlrpc_request *req,
 738                                       void *args, int rc)
 739 {
 740         struct osc_grant_args *aa = args;
 741         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
 742         struct ost_body *body;
 743
 744         if (rc != 0) {
 745                 __osc_update_grant(cli, aa->aa_oa->o_grant);
 746                 GOTO(out, rc);
 747         }
 748
 749         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 750         LASSERT(body);
 751         osc_update_grant(cli, body);
 752 out:
 753         OBD_SLAB_FREE_PTR(aa->aa_oa, osc_obdo_kmem);
 754         aa->aa_oa = NULL;
 755
 756         return rc;
 757 }
 758
 759 static void osc_shrink_grant_local(struct client_obd *cli, struct obdo *oa)
 760 {
 761         spin_lock(&cli->cl_loi_list_lock);
 762         oa->o_grant = cli->cl_avail_grant / 4;
 763         cli->cl_avail_grant -= oa->o_grant;
 764         spin_unlock(&cli->cl_loi_list_lock);
 765         if (!(oa->o_valid & OBD_MD_FLFLAGS)) {
 766                 oa->o_valid |= OBD_MD_FLFLAGS;
 767                 oa->o_flags = 0;
 768         }
 769         oa->o_flags |= OBD_FL_SHRINK_GRANT;
 770         osc_update_next_shrink(cli);
 771 }
 772
 773 /* Shrink the current grant, either from some large amount to enough for a
 774  * full set of in-flight RPCs, or if we have already shrunk to that limit
 775  * then to enough for a single RPC.  This avoids keeping more grant than
 776  * needed, and avoids shrinking the grant piecemeal. */
 777 static int osc_shrink_grant(struct client_obd *cli)
 778 {
 779         __u64 target_bytes = (cli->cl_max_rpcs_in_flight + 1) *
 780                              (cli->cl_max_pages_per_rpc << PAGE_SHIFT);
 781
 782         spin_lock(&cli->cl_loi_list_lock);
 783         if (cli->cl_avail_grant <= target_bytes)
 784                 target_bytes = cli->cl_max_pages_per_rpc << PAGE_SHIFT;
 785         spin_unlock(&cli->cl_loi_list_lock);
 786
 787         return osc_shrink_grant_to_target(cli, target_bytes);
 788 }
 789
 790 int osc_shrink_grant_to_target(struct client_obd *cli, __u64 target_bytes)
 791 {
 792         int                     rc = 0;
 793         struct ost_body        *body;
 794         ENTRY;
 795
 796         spin_lock(&cli->cl_loi_list_lock);
 797         /* Don't shrink if we are already above or below the desired limit
 798          * We don't want to shrink below a single RPC, as that will negatively
 799          * impact block allocation and long-term performance. */
 800         if (target_bytes < cli->cl_max_pages_per_rpc << PAGE_SHIFT)
 801                 target_bytes = cli->cl_max_pages_per_rpc << PAGE_SHIFT;
 802
 803         if (target_bytes >= cli->cl_avail_grant) {
 804                 spin_unlock(&cli->cl_loi_list_lock);
 805                 RETURN(0);
 806         }
 807         spin_unlock(&cli->cl_loi_list_lock);
 808
 809         OBD_ALLOC_PTR(body);
 810         if (!body)
 811                 RETURN(-ENOMEM);
 812
 813         osc_announce_cached(cli, &body->oa, 0);
 814
 815         spin_lock(&cli->cl_loi_list_lock);
 816         if (target_bytes >= cli->cl_avail_grant) {
 817                 /* available grant has changed since target calculation */
 818                 spin_unlock(&cli->cl_loi_list_lock);
 819                 GOTO(out_free, rc = 0);
 820         }
 821         body->oa.o_grant = cli->cl_avail_grant - target_bytes;
 822         cli->cl_avail_grant = target_bytes;
 823         spin_unlock(&cli->cl_loi_list_lock);
 824         if (!(body->oa.o_valid & OBD_MD_FLFLAGS)) {
 825                 body->oa.o_valid |= OBD_MD_FLFLAGS;
 826                 body->oa.o_flags = 0;
 827         }
 828         body->oa.o_flags |= OBD_FL_SHRINK_GRANT;
 829         osc_update_next_shrink(cli);
 830
 831         rc = osc_set_info_async(NULL, cli->cl_import->imp_obd->obd_self_export,
 832                                 sizeof(KEY_GRANT_SHRINK), KEY_GRANT_SHRINK,
 833                                 sizeof(*body), body, NULL);
 834         if (rc != 0)
 835                 __osc_update_grant(cli, body->oa.o_grant);
 836 out_free:
 837         OBD_FREE_PTR(body);
 838         RETURN(rc);
 839 }
 840
 841 static int osc_should_shrink_grant(struct client_obd *client)
 842 {
 843         time64_t next_shrink = client->cl_next_shrink_grant;
 844
 845         if (client->cl_import == NULL)
 846                 return 0;
 847
 848         if (!OCD_HAS_FLAG(&client->cl_import->imp_connect_data, GRANT_SHRINK) ||
 849             client->cl_import->imp_grant_shrink_disabled)
 850                 return 0;
 851
 852         if (ktime_get_seconds() >= next_shrink - 5) {
 853                 /* Get the current RPC size directly, instead of going via:
 854                  * cli_brw_size(obd->u.cli.cl_import->imp_obd->obd_self_export)
 855                  * Keep comment here so that it can be found by searching. */
 856                 int brw_size = client->cl_max_pages_per_rpc << PAGE_SHIFT;
 857
 858                 if (client->cl_import->imp_state == LUSTRE_IMP_FULL &&
 859                     client->cl_avail_grant > brw_size)
 860                         return 1;
 861                 else
 862                         osc_update_next_shrink(client);
 863         }
 864         return 0;
 865 }
 866
 867 #define GRANT_SHRINK_RPC_BATCH  100
 868
 869 static struct delayed_work work;
 870
 871 static void osc_grant_work_handler(struct work_struct *data)
 872 {
 873         struct client_obd *cli;
 874         int rpc_sent;
 875         bool init_next_shrink = true;
 876         time64_t next_shrink = ktime_get_seconds() + GRANT_SHRINK_INTERVAL;
 877
 878         rpc_sent = 0;
 879         mutex_lock(&client_gtd.gtd_mutex);
 880         list_for_each_entry(cli, &client_gtd.gtd_clients,
 881                             cl_grant_chain) {
 882                 if (rpc_sent < GRANT_SHRINK_RPC_BATCH &&
 883                     osc_should_shrink_grant(cli)) {
 884                         osc_shrink_grant(cli);
 885                         rpc_sent++;
 886                 }
 887
 888                 if (!init_next_shrink) {
 889                         if (cli->cl_next_shrink_grant < next_shrink &&
 890                             cli->cl_next_shrink_grant > ktime_get_seconds())
 891                                 next_shrink = cli->cl_next_shrink_grant;
 892                 } else {
 893                         init_next_shrink = false;
 894                         next_shrink = cli->cl_next_shrink_grant;
 895                 }
 896         }
 897         mutex_unlock(&client_gtd.gtd_mutex);
 898
 899         if (client_gtd.gtd_stopped == 1)
 900                 return;
 901
 902         if (next_shrink > ktime_get_seconds()) {
 903                 time64_t delay = next_shrink - ktime_get_seconds();
 904
 905                 schedule_delayed_work(&work, cfs_time_seconds(delay));
 906         } else {
 907                 schedule_work(&work.work);
 908         }
 909 }
 910
 911 void osc_schedule_grant_work(void)
 912 {
 913         cancel_delayed_work_sync(&work);
 914         schedule_work(&work.work);
 915 }
 916
 917 /**
 918  * Start grant thread for returing grant to server for idle clients.
 919  */
 920 static int osc_start_grant_work(void)
 921 {
 922         client_gtd.gtd_stopped = 0;
 923         mutex_init(&client_gtd.gtd_mutex);
 924         INIT_LIST_HEAD(&client_gtd.gtd_clients);
 925
 926         INIT_DELAYED_WORK(&work, osc_grant_work_handler);
 927         schedule_work(&work.work);
 928
 929         return 0;
 930 }
 931
 932 static void osc_stop_grant_work(void)
 933 {
 934         client_gtd.gtd_stopped = 1;
 935         cancel_delayed_work_sync(&work);
 936 }
 937
 938 static void osc_add_grant_list(struct client_obd *client)
 939 {
 940         mutex_lock(&client_gtd.gtd_mutex);
 941         list_add(&client->cl_grant_chain, &client_gtd.gtd_clients);
 942         mutex_unlock(&client_gtd.gtd_mutex);
 943 }
 944
 945 static void osc_del_grant_list(struct client_obd *client)
 946 {
 947         if (list_empty(&client->cl_grant_chain))
 948                 return;
 949
 950         mutex_lock(&client_gtd.gtd_mutex);
 951         list_del_init(&client->cl_grant_chain);
 952         mutex_unlock(&client_gtd.gtd_mutex);
 953 }
 954
 955 void osc_init_grant(struct client_obd *cli, struct obd_connect_data *ocd)
 956 {
 957         /*
 958          * ocd_grant is the total grant amount we're expect to hold: if we've
 959          * been evicted, it's the new avail_grant amount, cl_dirty_pages will
 960          * drop to 0 as inflight RPCs fail out; otherwise, it's avail_grant +
 961          * dirty.
 962          *
 963          * race is tolerable here: if we're evicted, but imp_state already
 964          * left EVICTED state, then cl_dirty_pages must be 0 already.
 965          */
 966         spin_lock(&cli->cl_loi_list_lock);
 967         cli->cl_avail_grant = ocd->ocd_grant;
 968         if (cli->cl_import->imp_state != LUSTRE_IMP_EVICTED) {
 969                 cli->cl_avail_grant -= cli->cl_reserved_grant;
 970                 if (OCD_HAS_FLAG(ocd, GRANT_PARAM))
 971                         cli->cl_avail_grant -= cli->cl_dirty_grant;
 972                 else
 973                         cli->cl_avail_grant -=
 974                                         cli->cl_dirty_pages << PAGE_SHIFT;
 975         }
 976
 977         if (OCD_HAS_FLAG(ocd, GRANT_PARAM)) {
 978                 u64 size;
 979                 int chunk_mask;
 980
 981                 /* overhead for each extent insertion */
 982                 cli->cl_grant_extent_tax = ocd->ocd_grant_tax_kb << 10;
 983                 /* determine the appropriate chunk size used by osc_extent. */
 984                 cli->cl_chunkbits = max_t(int, PAGE_SHIFT,
 985                                           ocd->ocd_grant_blkbits);
 986                 /* max_pages_per_rpc must be chunk aligned */
 987                 chunk_mask = ~((1 << (cli->cl_chunkbits - PAGE_SHIFT)) - 1);
 988                 cli->cl_max_pages_per_rpc = (cli->cl_max_pages_per_rpc +
 989                                              ~chunk_mask) & chunk_mask;
 990                 /* determine maximum extent size, in #pages */
 991                 size = (u64)ocd->ocd_grant_max_blks << ocd->ocd_grant_blkbits;
 992                 cli->cl_max_extent_pages = size >> PAGE_SHIFT;
 993                 if (cli->cl_max_extent_pages == 0)
 994                         cli->cl_max_extent_pages = 1;
 995         } else {
 996                 cli->cl_grant_extent_tax = 0;
 997                 cli->cl_chunkbits = PAGE_SHIFT;
 998                 cli->cl_max_extent_pages = DT_MAX_BRW_PAGES;
 999         }
1000         spin_unlock(&cli->cl_loi_list_lock);
1001
1002         CDEBUG(D_CACHE, "%s, setting cl_avail_grant: %ld cl_lost_grant: %ld."
1003                 "chunk bits: %d cl_max_extent_pages: %d\n",
1004                 cli_name(cli),
1005                 cli->cl_avail_grant, cli->cl_lost_grant, cli->cl_chunkbits,
1006                 cli->cl_max_extent_pages);
1007
1008         if (OCD_HAS_FLAG(ocd, GRANT_SHRINK) && list_empty(&cli->cl_grant_chain))
1009                 osc_add_grant_list(cli);
1010 }
1011 EXPORT_SYMBOL(osc_init_grant);
1012
1013 /* We assume that the reason this OSC got a short read is because it read
1014  * beyond the end of a stripe file; i.e. lustre is reading a sparse file
1015  * via the LOV, and it _knows_ it's reading inside the file, it's just that
1016  * this stripe never got written at or beyond this stripe offset yet. */
1017 static void handle_short_read(int nob_read, size_t page_count,
1018                               struct brw_page **pga)
1019 {
1020         char *ptr;
1021         int i = 0;
1022
1023         /* skip bytes read OK */
1024         while (nob_read > 0) {
1025                 LASSERT (page_count > 0);
1026
1027                 if (pga[i]->count > nob_read) {
1028                         /* EOF inside this page */
1029                         ptr = kmap(pga[i]->pg) +
1030                                 (pga[i]->off & ~PAGE_MASK);
1031                         memset(ptr + nob_read, 0, pga[i]->count - nob_read);
1032                         kunmap(pga[i]->pg);
1033                         page_count--;
1034                         i++;
1035                         break;
1036                 }
1037
1038                 nob_read -= pga[i]->count;
1039                 page_count--;
1040                 i++;
1041         }
1042
1043         /* zero remaining pages */
1044         while (page_count-- > 0) {
1045                 ptr = kmap(pga[i]->pg) + (pga[i]->off & ~PAGE_MASK);
1046                 memset(ptr, 0, pga[i]->count);
1047                 kunmap(pga[i]->pg);
1048                 i++;
1049         }
1050 }
1051
1052 static int check_write_rcs(struct ptlrpc_request *req,
1053                            int requested_nob, int niocount,
1054                            size_t page_count, struct brw_page **pga)
1055 {
1056         int     i;
1057         __u32   *remote_rcs;
1058
1059         remote_rcs = req_capsule_server_sized_get(&req->rq_pill, &RMF_RCS,
1060                                                   sizeof(*remote_rcs) *
1061                                                   niocount);
1062         if (remote_rcs == NULL) {
1063                 CDEBUG(D_INFO, "Missing/short RC vector on BRW_WRITE reply\n");
1064                 return(-EPROTO);
1065         }
1066
1067         /* return error if any niobuf was in error */
1068         for (i = 0; i < niocount; i++) {
1069                 if ((int)remote_rcs[i] < 0) {
1070                         CDEBUG(D_INFO, "rc[%d]: %d req %p\n",
1071                                i, remote_rcs[i], req);
1072                         return remote_rcs[i];
1073                 }
1074
1075                 if (remote_rcs[i] != 0) {
1076                         CDEBUG(D_INFO, "rc[%d] invalid (%d) req %p\n",
1077                                 i, remote_rcs[i], req);
1078                         return(-EPROTO);
1079                 }
1080         }
1081         if (req->rq_bulk != NULL &&
1082             req->rq_bulk->bd_nob_transferred != requested_nob) {
1083                 CERROR("Unexpected # bytes transferred: %d (requested %d)\n",
1084                        req->rq_bulk->bd_nob_transferred, requested_nob);
1085                 return(-EPROTO);
1086         }
1087
1088         return (0);
1089 }
1090
1091 static inline int can_merge_pages(struct brw_page *p1, struct brw_page *p2)
1092 {
1093         if (p1->flag != p2->flag) {
1094                 unsigned mask = ~(OBD_BRW_FROM_GRANT | OBD_BRW_NOCACHE |
1095                                   OBD_BRW_SYNC       | OBD_BRW_ASYNC   |
1096                                   OBD_BRW_NOQUOTA    | OBD_BRW_SOFT_SYNC);
1097
1098                 /* warn if we try to combine flags that we don't know to be
1099                  * safe to combine */
1100                 if (unlikely((p1->flag & mask) != (p2->flag & mask))) {
1101                         CWARN("Saw flags 0x%x and 0x%x in the same brw, please "
1102                               "report this at https://jira.whamcloud.com/\n",
1103                               p1->flag, p2->flag);
1104                 }
1105                 return 0;
1106         }
1107
1108         return (p1->off + p1->count == p2->off);
1109 }
1110
1111 #if IS_ENABLED(CONFIG_CRC_T10DIF)
1112 static int osc_checksum_bulk_t10pi(const char *obd_name, int nob,
1113                                    size_t pg_count, struct brw_page **pga,
1114                                    int opc, obd_dif_csum_fn *fn,
1115                                    int sector_size,
1116                                    u32 *check_sum)
1117 {
1118         struct ahash_request *req;
1119         /* Used Adler as the default checksum type on top of DIF tags */
1120         unsigned char cfs_alg = cksum_obd2cfs(OBD_CKSUM_T10_TOP);
1121         struct page *__page;
1122         unsigned char *buffer;
1123         __u16 *guard_start;
1124         unsigned int bufsize;
1125         int guard_number;
1126         int used_number = 0;
1127         int used;
1128         u32 cksum;
1129         int rc = 0;
1130         int i = 0;
1131
1132         LASSERT(pg_count > 0);
1133
1134         __page = alloc_page(GFP_KERNEL);
1135         if (__page == NULL)
1136                 return -ENOMEM;
1137
1138         req = cfs_crypto_hash_init(cfs_alg, NULL, 0);
1139         if (IS_ERR(req)) {
1140                 rc = PTR_ERR(req);
1141                 CERROR("%s: unable to initialize checksum hash %s: rc = %d\n",
1142                        obd_name, cfs_crypto_hash_name(cfs_alg), rc);
1143                 GOTO(out, rc);
1144         }
1145
1146         buffer = kmap(__page);
1147         guard_start = (__u16 *)buffer;
1148         guard_number = PAGE_SIZE / sizeof(*guard_start);
1149         while (nob > 0 && pg_count > 0) {
1150                 unsigned int count = pga[i]->count > nob ? nob : pga[i]->count;
1151
1152                 /* corrupt the data before we compute the checksum, to
1153                  * simulate an OST->client data error */
1154                 if (unlikely(i == 0 && opc == OST_READ &&
1155                              OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_RECEIVE))) {
1156                         unsigned char *ptr = kmap(pga[i]->pg);
1157                         int off = pga[i]->off & ~PAGE_MASK;
1158
1159                         memcpy(ptr + off, "bad1", min_t(typeof(nob), 4, nob));
1160                         kunmap(pga[i]->pg);
1161                 }
1162
1163                 /*
1164                  * The left guard number should be able to hold checksums of a
1165                  * whole page
1166                  */
1167                 rc = obd_page_dif_generate_buffer(obd_name, pga[i]->pg,
1168                                                   pga[i]->off & ~PAGE_MASK,
1169                                                   count,
1170                                                   guard_start + used_number,
1171                                                   guard_number - used_number,
1172                                                   &used, sector_size,
1173                                                   fn);
1174                 if (rc)
1175                         break;
1176
1177                 used_number += used;
1178                 if (used_number == guard_number) {
1179                         cfs_crypto_hash_update_page(req, __page, 0,
1180                                 used_number * sizeof(*guard_start));
1181                         used_number = 0;
1182                 }
1183
1184                 nob -= pga[i]->count;
1185                 pg_count--;
1186                 i++;
1187         }
1188         kunmap(__page);
1189         if (rc)
1190                 GOTO(out, rc);
1191
1192         if (used_number != 0)
1193                 cfs_crypto_hash_update_page(req, __page, 0,
1194                         used_number * sizeof(*guard_start));
1195
1196         bufsize = sizeof(cksum);
1197         cfs_crypto_hash_final(req, (unsigned char *)&cksum, &bufsize);
1198
1199         /* For sending we only compute the wrong checksum instead
1200          * of corrupting the data so it is still correct on a redo */
1201         if (opc == OST_WRITE && OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_SEND))
1202                 cksum++;
1203
1204         *check_sum = cksum;
1205 out:
1206         __free_page(__page);
1207         return rc;
1208 }
1209 #else /* !CONFIG_CRC_T10DIF */
1210 #define obd_dif_ip_fn NULL
1211 #define obd_dif_crc_fn NULL
1212 #define osc_checksum_bulk_t10pi(name, nob, pgc, pga, opc, fn, ssize, csum)  \
1213         -EOPNOTSUPP
1214 #endif /* CONFIG_CRC_T10DIF */
1215
1216 static int osc_checksum_bulk(int nob, size_t pg_count,
1217                              struct brw_page **pga, int opc,
1218                              enum cksum_types cksum_type,
1219                              u32 *cksum)
1220 {
1221         int                             i = 0;
1222         struct ahash_request           *req;
1223         unsigned int                    bufsize;
1224         unsigned char                   cfs_alg = cksum_obd2cfs(cksum_type);
1225
1226         LASSERT(pg_count > 0);
1227
1228         req = cfs_crypto_hash_init(cfs_alg, NULL, 0);
1229         if (IS_ERR(req)) {
1230                 CERROR("Unable to initialize checksum hash %s\n",
1231                        cfs_crypto_hash_name(cfs_alg));
1232                 return PTR_ERR(req);
1233         }
1234
1235         while (nob > 0 && pg_count > 0) {
1236                 unsigned int count = pga[i]->count > nob ? nob : pga[i]->count;
1237
1238                 /* corrupt the data before we compute the checksum, to
1239                  * simulate an OST->client data error */
1240                 if (i == 0 && opc == OST_READ &&
1241                     OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_RECEIVE)) {
1242                         unsigned char *ptr = kmap(pga[i]->pg);
1243                         int off = pga[i]->off & ~PAGE_MASK;
1244
1245                         memcpy(ptr + off, "bad1", min_t(typeof(nob), 4, nob));
1246                         kunmap(pga[i]->pg);
1247                 }
1248                 cfs_crypto_hash_update_page(req, pga[i]->pg,
1249                                             pga[i]->off & ~PAGE_MASK,
1250                                             count);
1251                 LL_CDEBUG_PAGE(D_PAGE, pga[i]->pg, "off %d\n",
1252                                (int)(pga[i]->off & ~PAGE_MASK));
1253
1254                 nob -= pga[i]->count;
1255                 pg_count--;
1256                 i++;
1257         }
1258
1259         bufsize = sizeof(*cksum);
1260         cfs_crypto_hash_final(req, (unsigned char *)cksum, &bufsize);
1261
1262         /* For sending we only compute the wrong checksum instead
1263          * of corrupting the data so it is still correct on a redo */
1264         if (opc == OST_WRITE && OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_SEND))
1265                 (*cksum)++;
1266
1267         return 0;
1268 }
1269
1270 static int osc_checksum_bulk_rw(const char *obd_name,
1271                                 enum cksum_types cksum_type,
1272                                 int nob, size_t pg_count,
1273                                 struct brw_page **pga, int opc,
1274                                 u32 *check_sum)
1275 {
1276         obd_dif_csum_fn *fn = NULL;
1277         int sector_size = 0;
1278         int rc;
1279
1280         ENTRY;
1281         obd_t10_cksum2dif(cksum_type, &fn, &sector_size);
1282
1283         if (fn)
1284                 rc = osc_checksum_bulk_t10pi(obd_name, nob, pg_count, pga,
1285                                              opc, fn, sector_size, check_sum);
1286         else
1287                 rc = osc_checksum_bulk(nob, pg_count, pga, opc, cksum_type,
1288                                        check_sum);
1289
1290         RETURN(rc);
1291 }
1292
1293 static int
1294 osc_brw_prep_request(int cmd, struct client_obd *cli, struct obdo *oa,
1295                      u32 page_count, struct brw_page **pga,
1296                      struct ptlrpc_request **reqp, int resend)
1297 {
1298         struct ptlrpc_request   *req;
1299         struct ptlrpc_bulk_desc *desc;
1300         struct ost_body         *body;
1301         struct obd_ioobj        *ioobj;
1302         struct niobuf_remote    *niobuf;
1303         int niocount, i, requested_nob, opc, rc, short_io_size = 0;
1304         struct osc_brw_async_args *aa;
1305         struct req_capsule      *pill;
1306         struct brw_page *pg_prev;
1307         void *short_io_buf;
1308         const char *obd_name = cli->cl_import->imp_obd->obd_name;
1309
1310         ENTRY;
1311         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_BRW_PREP_REQ))
1312                 RETURN(-ENOMEM); /* Recoverable */
1313         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_BRW_PREP_REQ2))
1314                 RETURN(-EINVAL); /* Fatal */
1315
1316         if ((cmd & OBD_BRW_WRITE) != 0) {
1317                 opc = OST_WRITE;
1318                 req = ptlrpc_request_alloc_pool(cli->cl_import,
1319                                                 osc_rq_pool,
1320                                                 &RQF_OST_BRW_WRITE);
1321         } else {
1322                 opc = OST_READ;
1323                 req = ptlrpc_request_alloc(cli->cl_import, &RQF_OST_BRW_READ);
1324         }
1325         if (req == NULL)
1326                 RETURN(-ENOMEM);
1327
1328         for (niocount = i = 1; i < page_count; i++) {
1329                 if (!can_merge_pages(pga[i - 1], pga[i]))
1330                         niocount++;
1331         }
1332
1333         pill = &req->rq_pill;
1334         req_capsule_set_size(pill, &RMF_OBD_IOOBJ, RCL_CLIENT,
1335                              sizeof(*ioobj));
1336         req_capsule_set_size(pill, &RMF_NIOBUF_REMOTE, RCL_CLIENT,
1337                              niocount * sizeof(*niobuf));
1338
1339         for (i = 0; i < page_count; i++)
1340                 short_io_size += pga[i]->count;
1341
1342         /* Check if read/write is small enough to be a short io. */
1343         if (short_io_size > cli->cl_max_short_io_bytes || niocount > 1 ||
1344             !imp_connect_shortio(cli->cl_import))
1345                 short_io_size = 0;
1346
1347         req_capsule_set_size(pill, &RMF_SHORT_IO, RCL_CLIENT,
1348                              opc == OST_READ ? 0 : short_io_size);
1349         if (opc == OST_READ)
1350                 req_capsule_set_size(pill, &RMF_SHORT_IO, RCL_SERVER,
1351                                      short_io_size);
1352
1353         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, opc);
1354         if (rc) {
1355                 ptlrpc_request_free(req);
1356                 RETURN(rc);
1357         }
1358         osc_set_io_portal(req);
1359
1360         ptlrpc_at_set_req_timeout(req);
1361         /* ask ptlrpc not to resend on EINPROGRESS since BRWs have their own
1362          * retry logic */
1363         req->rq_no_retry_einprogress = 1;
1364
1365         if (short_io_size != 0) {
1366                 desc = NULL;
1367                 short_io_buf = NULL;
1368                 goto no_bulk;
1369         }
1370
1371         desc = ptlrpc_prep_bulk_imp(req, page_count,
1372                 cli->cl_import->imp_connect_data.ocd_brw_size >> LNET_MTU_BITS,
1373                 (opc == OST_WRITE ? PTLRPC_BULK_GET_SOURCE :
1374                         PTLRPC_BULK_PUT_SINK) |
1375                         PTLRPC_BULK_BUF_KIOV,
1376                 OST_BULK_PORTAL,
1377                 &ptlrpc_bulk_kiov_pin_ops);
1378
1379         if (desc == NULL)
1380                 GOTO(out, rc = -ENOMEM);
1381         /* NB request now owns desc and will free it when it gets freed */
1382 no_bulk:
1383         body = req_capsule_client_get(pill, &RMF_OST_BODY);
1384         ioobj = req_capsule_client_get(pill, &RMF_OBD_IOOBJ);
1385         niobuf = req_capsule_client_get(pill, &RMF_NIOBUF_REMOTE);
1386         LASSERT(body != NULL && ioobj != NULL && niobuf != NULL);
1387
1388         lustre_set_wire_obdo(&req->rq_import->imp_connect_data, &body->oa, oa);
1389
1390         /* For READ and WRITE, we can't fill o_uid and o_gid using from_kuid()
1391          * and from_kgid(), because they are asynchronous. Fortunately, variable
1392          * oa contains valid o_uid and o_gid in these two operations.
1393          * Besides, filling o_uid and o_gid is enough for nrs-tbf, see LU-9658.
1394          * OBD_MD_FLUID and OBD_MD_FLUID is not set in order to avoid breaking
1395          * other process logic */
1396         body->oa.o_uid = oa->o_uid;
1397         body->oa.o_gid = oa->o_gid;
1398
1399         obdo_to_ioobj(oa, ioobj);
1400         ioobj->ioo_bufcnt = niocount;
1401         /* The high bits of ioo_max_brw tells server _maximum_ number of bulks
1402          * that might be send for this request.  The actual number is decided
1403          * when the RPC is finally sent in ptlrpc_register_bulk(). It sends
1404          * "max - 1" for old client compatibility sending "0", and also so the
1405          * the actual maximum is a power-of-two number, not one less. LU-1431 */
1406         if (desc != NULL)
1407                 ioobj_max_brw_set(ioobj, desc->bd_md_max_brw);
1408         else /* short io */
1409                 ioobj_max_brw_set(ioobj, 0);
1410
1411         if (short_io_size != 0) {
1412                 if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0) {
1413                         body->oa.o_valid |= OBD_MD_FLFLAGS;
1414                         body->oa.o_flags = 0;
1415                 }
1416                 body->oa.o_flags |= OBD_FL_SHORT_IO;
1417                 CDEBUG(D_CACHE, "Using short io for data transfer, size = %d\n",
1418                        short_io_size);
1419                 if (opc == OST_WRITE) {
1420                         short_io_buf = req_capsule_client_get(pill,
1421                                                               &RMF_SHORT_IO);
1422                         LASSERT(short_io_buf != NULL);
1423                 }
1424         }
1425
1426         LASSERT(page_count > 0);
1427         pg_prev = pga[0];
1428         for (requested_nob = i = 0; i < page_count; i++, niobuf++) {
1429                 struct brw_page *pg = pga[i];
1430                 int poff = pg->off & ~PAGE_MASK;
1431
1432                 LASSERT(pg->count > 0);
1433                 /* make sure there is no gap in the middle of page array */
1434                 LASSERTF(page_count == 1 ||
1435                          (ergo(i == 0, poff + pg->count == PAGE_SIZE) &&
1436                           ergo(i > 0 && i < page_count - 1,
1437                                poff == 0 && pg->count == PAGE_SIZE)   &&
1438                           ergo(i == page_count - 1, poff == 0)),
1439                          "i: %d/%d pg: %p off: %llu, count: %u\n",
1440                          i, page_count, pg, pg->off, pg->count);
1441                 LASSERTF(i == 0 || pg->off > pg_prev->off,
1442                          "i %d p_c %u pg %p [pri %lu ind %lu] off %llu"
1443                          " prev_pg %p [pri %lu ind %lu] off %llu\n",
1444                          i, page_count,
1445                          pg->pg, page_private(pg->pg), pg->pg->index, pg->off,
1446                          pg_prev->pg, page_private(pg_prev->pg),
1447                          pg_prev->pg->index, pg_prev->off);
1448                 LASSERT((pga[0]->flag & OBD_BRW_SRVLOCK) ==
1449                         (pg->flag & OBD_BRW_SRVLOCK));
1450                 if (short_io_size != 0 && opc == OST_WRITE) {
1451                         unsigned char *ptr = ll_kmap_atomic(pg->pg, KM_USER0);
1452
1453                         LASSERT(short_io_size >= requested_nob + pg->count);
1454                         memcpy(short_io_buf + requested_nob,
1455                                ptr + poff,
1456                                pg->count);
1457                         ll_kunmap_atomic(ptr, KM_USER0);
1458                 } else if (short_io_size == 0) {
1459                         desc->bd_frag_ops->add_kiov_frag(desc, pg->pg, poff,
1460                                                          pg->count);
1461                 }
1462                 requested_nob += pg->count;
1463
1464                 if (i > 0 && can_merge_pages(pg_prev, pg)) {
1465                         niobuf--;
1466                         niobuf->rnb_len += pg->count;
1467                 } else {
1468                         niobuf->rnb_offset = pg->off;
1469                         niobuf->rnb_len    = pg->count;
1470                         niobuf->rnb_flags  = pg->flag;
1471                 }
1472                 pg_prev = pg;
1473         }
1474
1475         LASSERTF((void *)(niobuf - niocount) ==
1476                 req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE),
1477                 "want %p - real %p\n", req_capsule_client_get(&req->rq_pill,
1478                 &RMF_NIOBUF_REMOTE), (void *)(niobuf - niocount));
1479
1480         osc_announce_cached(cli, &body->oa, opc == OST_WRITE ? requested_nob:0);
1481         if (resend) {
1482                 if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0) {
1483                         body->oa.o_valid |= OBD_MD_FLFLAGS;
1484                         body->oa.o_flags = 0;
1485                 }
1486                 body->oa.o_flags |= OBD_FL_RECOV_RESEND;
1487         }
1488
1489         if (osc_should_shrink_grant(cli))
1490                 osc_shrink_grant_local(cli, &body->oa);
1491
1492         /* size[REQ_REC_OFF] still sizeof (*body) */
1493         if (opc == OST_WRITE) {
1494                 if (cli->cl_checksum &&
1495                     !sptlrpc_flavor_has_bulk(&req->rq_flvr)) {
1496                         /* store cl_cksum_type in a local variable since
1497                          * it can be changed via lprocfs */
1498                         enum cksum_types cksum_type = cli->cl_cksum_type;
1499
1500                         if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0)
1501                                 body->oa.o_flags = 0;
1502
1503                         body->oa.o_flags |= obd_cksum_type_pack(obd_name,
1504                                                                 cksum_type);
1505                         body->oa.o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1506
1507                         rc = osc_checksum_bulk_rw(obd_name, cksum_type,
1508                                                   requested_nob, page_count,
1509                                                   pga, OST_WRITE,
1510                                                   &body->oa.o_cksum);
1511                         if (rc < 0) {
1512                                 CDEBUG(D_PAGE, "failed to checksum, rc = %d\n",
1513                                        rc);
1514                                 GOTO(out, rc);
1515                         }
1516                         CDEBUG(D_PAGE, "checksum at write origin: %x\n",
1517                                body->oa.o_cksum);
1518
1519                         /* save this in 'oa', too, for later checking */
1520                         oa->o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1521                         oa->o_flags |= obd_cksum_type_pack(obd_name,
1522                                                            cksum_type);
1523                 } else {
1524                         /* clear out the checksum flag, in case this is a
1525                          * resend but cl_checksum is no longer set. b=11238 */
1526                         oa->o_valid &= ~OBD_MD_FLCKSUM;
1527                 }
1528                 oa->o_cksum = body->oa.o_cksum;
1529                 /* 1 RC per niobuf */
1530                 req_capsule_set_size(pill, &RMF_RCS, RCL_SERVER,
1531                                      sizeof(__u32) * niocount);
1532         } else {
1533                 if (cli->cl_checksum &&
1534                     !sptlrpc_flavor_has_bulk(&req->rq_flvr)) {
1535                         if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0)
1536                                 body->oa.o_flags = 0;
1537                         body->oa.o_flags |= obd_cksum_type_pack(obd_name,
1538                                 cli->cl_cksum_type);
1539                         body->oa.o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1540                 }
1541
1542                 /* Client cksum has been already copied to wire obdo in previous
1543                  * lustre_set_wire_obdo(), and in the case a bulk-read is being
1544                  * resent due to cksum error, this will allow Server to
1545                  * check+dump pages on its side */
1546         }
1547         ptlrpc_request_set_replen(req);
1548
1549         aa = ptlrpc_req_async_args(aa, req);
1550         aa->aa_oa = oa;
1551         aa->aa_requested_nob = requested_nob;
1552         aa->aa_nio_count = niocount;
1553         aa->aa_page_count = page_count;
1554         aa->aa_resends = 0;
1555         aa->aa_ppga = pga;
1556         aa->aa_cli = cli;
1557         INIT_LIST_HEAD(&aa->aa_oaps);
1558
1559         *reqp = req;
1560         niobuf = req_capsule_client_get(pill, &RMF_NIOBUF_REMOTE);
1561         CDEBUG(D_RPCTRACE, "brw rpc %p - object "DOSTID" offset %lld<>%lld\n",
1562                 req, POSTID(&oa->o_oi), niobuf[0].rnb_offset,
1563                 niobuf[niocount - 1].rnb_offset + niobuf[niocount - 1].rnb_len);
1564         RETURN(0);
1565
1566  out:
1567         ptlrpc_req_finished(req);
1568         RETURN(rc);
1569 }
1570
1571 char dbgcksum_file_name[PATH_MAX];
1572
1573 static void dump_all_bulk_pages(struct obdo *oa, __u32 page_count,
1574                                 struct brw_page **pga, __u32 server_cksum,
1575                                 __u32 client_cksum)
1576 {
1577         struct file *filp;
1578         int rc, i;
1579         unsigned int len;
1580         char *buf;
1581
1582         /* will only keep dump of pages on first error for the same range in
1583          * file/fid, not during the resends/retries. */
1584         snprintf(dbgcksum_file_name, sizeof(dbgcksum_file_name),
1585                  "%s-checksum_dump-osc-"DFID":[%llu-%llu]-%x-%x",
1586                  (strncmp(libcfs_debug_file_path_arr, "NONE", 4) != 0 ?
1587                   libcfs_debug_file_path_arr :
1588                   LIBCFS_DEBUG_FILE_PATH_DEFAULT),
1589                  oa->o_valid & OBD_MD_FLFID ? oa->o_parent_seq : 0ULL,
1590                  oa->o_valid & OBD_MD_FLFID ? oa->o_parent_oid : 0,
1591                  oa->o_valid & OBD_MD_FLFID ? oa->o_parent_ver : 0,
1592                  pga[0]->off,
1593                  pga[page_count-1]->off + pga[page_count-1]->count - 1,
1594                  client_cksum, server_cksum);
1595         filp = filp_open(dbgcksum_file_name,
1596                          O_CREAT | O_EXCL | O_WRONLY | O_LARGEFILE, 0600);
1597         if (IS_ERR(filp)) {
1598                 rc = PTR_ERR(filp);
1599                 if (rc == -EEXIST)
1600                         CDEBUG(D_INFO, "%s: can't open to dump pages with "
1601                                "checksum error: rc = %d\n", dbgcksum_file_name,
1602                                rc);
1603                 else
1604                         CERROR("%s: can't open to dump pages with checksum "
1605                                "error: rc = %d\n", dbgcksum_file_name, rc);
1606                 return;
1607         }
1608
1609         for (i = 0; i < page_count; i++) {
1610                 len = pga[i]->count;
1611                 buf = kmap(pga[i]->pg);
1612                 while (len != 0) {
1613                         rc = cfs_kernel_write(filp, buf, len, &filp->f_pos);
1614                         if (rc < 0) {
1615                                 CERROR("%s: wanted to write %u but got %d "
1616                                        "error\n", dbgcksum_file_name, len, rc);
1617                                 break;
1618                         }
1619                         len -= rc;
1620                         buf += rc;
1621                         CDEBUG(D_INFO, "%s: wrote %d bytes\n",
1622                                dbgcksum_file_name, rc);
1623                 }
1624                 kunmap(pga[i]->pg);
1625         }
1626
1627         rc = vfs_fsync_range(filp, 0, LLONG_MAX, 1);
1628         if (rc)
1629                 CERROR("%s: sync returns %d\n", dbgcksum_file_name, rc);
1630         filp_close(filp, NULL);
1631 }
1632
1633 static int
1634 check_write_checksum(struct obdo *oa, const struct lnet_process_id *peer,
1635                      __u32 client_cksum, __u32 server_cksum,
1636                      struct osc_brw_async_args *aa)
1637 {
1638         const char *obd_name = aa->aa_cli->cl_import->imp_obd->obd_name;
1639         enum cksum_types cksum_type;
1640         obd_dif_csum_fn *fn = NULL;
1641         int sector_size = 0;
1642         __u32 new_cksum;
1643         char *msg;
1644         int rc;
1645
1646         if (server_cksum == client_cksum) {
1647                 CDEBUG(D_PAGE, "checksum %x confirmed\n", client_cksum);
1648                 return 0;
1649         }
1650
1651         if (aa->aa_cli->cl_checksum_dump)
1652                 dump_all_bulk_pages(oa, aa->aa_page_count, aa->aa_ppga,
1653                                     server_cksum, client_cksum);
1654
1655         cksum_type = obd_cksum_type_unpack(oa->o_valid & OBD_MD_FLFLAGS ?
1656                                            oa->o_flags : 0);
1657
1658         switch (cksum_type) {
1659         case OBD_CKSUM_T10IP512:
1660                 fn = obd_dif_ip_fn;
1661                 sector_size = 512;
1662                 break;
1663         case OBD_CKSUM_T10IP4K:
1664                 fn = obd_dif_ip_fn;
1665                 sector_size = 4096;
1666                 break;
1667         case OBD_CKSUM_T10CRC512:
1668                 fn = obd_dif_crc_fn;
1669                 sector_size = 512;
1670                 break;
1671         case OBD_CKSUM_T10CRC4K:
1672                 fn = obd_dif_crc_fn;
1673                 sector_size = 4096;
1674                 break;
1675         default:
1676                 break;
1677         }
1678
1679         if (fn)
1680                 rc = osc_checksum_bulk_t10pi(obd_name, aa->aa_requested_nob,
1681                                              aa->aa_page_count, aa->aa_ppga,
1682                                              OST_WRITE, fn, sector_size,
1683                                              &new_cksum);
1684         else
1685                 rc = osc_checksum_bulk(aa->aa_requested_nob, aa->aa_page_count,
1686                                        aa->aa_ppga, OST_WRITE, cksum_type,
1687                                        &new_cksum);
1688
1689         if (rc < 0)
1690                 msg = "failed to calculate the client write checksum";
1691         else if (cksum_type != obd_cksum_type_unpack(aa->aa_oa->o_flags))
1692                 msg = "the server did not use the checksum type specified in "
1693                       "the original request - likely a protocol problem";
1694         else if (new_cksum == server_cksum)
1695                 msg = "changed on the client after we checksummed it - "
1696                       "likely false positive due to mmap IO (bug 11742)";
1697         else if (new_cksum == client_cksum)
1698                 msg = "changed in transit before arrival at OST";
1699         else
1700                 msg = "changed in transit AND doesn't match the original - "
1701                       "likely false positive due to mmap IO (bug 11742)";
1702
1703         LCONSOLE_ERROR_MSG(0x132, "%s: BAD WRITE CHECKSUM: %s: from %s inode "
1704                            DFID " object "DOSTID" extent [%llu-%llu], original "
1705                            "client csum %x (type %x), server csum %x (type %x),"
1706                            " client csum now %x\n",
1707                            obd_name, msg, libcfs_nid2str(peer->nid),
1708                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_seq : (__u64)0,
1709                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_oid : 0,
1710                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_ver : 0,
1711                            POSTID(&oa->o_oi), aa->aa_ppga[0]->off,
1712                            aa->aa_ppga[aa->aa_page_count - 1]->off +
1713                                 aa->aa_ppga[aa->aa_page_count-1]->count - 1,
1714                            client_cksum,
1715                            obd_cksum_type_unpack(aa->aa_oa->o_flags),
1716                            server_cksum, cksum_type, new_cksum);
1717         return 1;
1718 }
1719
1720 /* Note rc enters this function as number of bytes transferred */
1721 static int osc_brw_fini_request(struct ptlrpc_request *req, int rc)
1722 {
1723         struct osc_brw_async_args *aa = (void *)&req->rq_async_args;
1724         struct client_obd *cli = aa->aa_cli;
1725         const char *obd_name = cli->cl_import->imp_obd->obd_name;
1726         const struct lnet_process_id *peer =
1727                 &req->rq_import->imp_connection->c_peer;
1728         struct ost_body *body;
1729         u32 client_cksum = 0;
1730
1731         ENTRY;
1732
1733         if (rc < 0 && rc != -EDQUOT) {
1734                 DEBUG_REQ(D_INFO, req, "Failed request: rc = %d", rc);
1735                 RETURN(rc);
1736         }
1737
1738         LASSERTF(req->rq_repmsg != NULL, "rc = %d\n", rc);
1739         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
1740         if (body == NULL) {
1741                 DEBUG_REQ(D_INFO, req, "cannot unpack body");
1742                 RETURN(-EPROTO);
1743         }
1744
1745         /* set/clear over quota flag for a uid/gid/projid */
1746         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE &&
1747             body->oa.o_valid & (OBD_MD_FLALLQUOTA)) {
1748                 unsigned qid[LL_MAXQUOTAS] = {
1749                                          body->oa.o_uid, body->oa.o_gid,
1750                                          body->oa.o_projid };
1751                 CDEBUG(D_QUOTA,
1752                        "setdq for [%u %u %u] with valid %#llx, flags %x\n",
1753                        body->oa.o_uid, body->oa.o_gid, body->oa.o_projid,
1754                        body->oa.o_valid, body->oa.o_flags);
1755                        osc_quota_setdq(cli, req->rq_xid, qid, body->oa.o_valid,
1756                                        body->oa.o_flags);
1757         }
1758
1759         osc_update_grant(cli, body);
1760
1761         if (rc < 0)
1762                 RETURN(rc);
1763
1764         if (aa->aa_oa->o_valid & OBD_MD_FLCKSUM)
1765                 client_cksum = aa->aa_oa->o_cksum; /* save for later */
1766
1767         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE) {
1768                 if (rc > 0) {
1769                         CERROR("%s: unexpected positive size %d\n",
1770                                obd_name, rc);
1771                         RETURN(-EPROTO);
1772                 }
1773
1774                 if (req->rq_bulk != NULL &&
1775                     sptlrpc_cli_unwrap_bulk_write(req, req->rq_bulk))
1776                         RETURN(-EAGAIN);
1777
1778                 if ((aa->aa_oa->o_valid & OBD_MD_FLCKSUM) && client_cksum &&
1779                     check_write_checksum(&body->oa, peer, client_cksum,
1780                                          body->oa.o_cksum, aa))
1781                         RETURN(-EAGAIN);
1782
1783                 rc = check_write_rcs(req, aa->aa_requested_nob,
1784                                      aa->aa_nio_count, aa->aa_page_count,
1785                                      aa->aa_ppga);
1786                 GOTO(out, rc);
1787         }
1788
1789         /* The rest of this function executes only for OST_READs */
1790
1791         if (req->rq_bulk == NULL) {
1792                 rc = req_capsule_get_size(&req->rq_pill, &RMF_SHORT_IO,
1793                                           RCL_SERVER);
1794                 LASSERT(rc == req->rq_status);
1795         } else {
1796                 /* if unwrap_bulk failed, return -EAGAIN to retry */
1797                 rc = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk, rc);
1798         }
1799         if (rc < 0)
1800                 GOTO(out, rc = -EAGAIN);
1801
1802         if (rc > aa->aa_requested_nob) {
1803                 CERROR("%s: unexpected size %d, requested %d\n", obd_name,
1804                        rc, aa->aa_requested_nob);
1805                 RETURN(-EPROTO);
1806         }
1807
1808         if (req->rq_bulk != NULL && rc != req->rq_bulk->bd_nob_transferred) {
1809                 CERROR("%s: unexpected size %d, transferred %d\n", obd_name,
1810                        rc, req->rq_bulk->bd_nob_transferred);
1811                 RETURN(-EPROTO);
1812         }
1813
1814         if (req->rq_bulk == NULL) {
1815                 /* short io */
1816                 int nob, pg_count, i = 0;
1817                 unsigned char *buf;
1818
1819                 CDEBUG(D_CACHE, "Using short io read, size %d\n", rc);
1820                 pg_count = aa->aa_page_count;
1821                 buf = req_capsule_server_sized_get(&req->rq_pill, &RMF_SHORT_IO,
1822                                                    rc);
1823                 nob = rc;
1824                 while (nob > 0 && pg_count > 0) {
1825                         unsigned char *ptr;
1826                         int count = aa->aa_ppga[i]->count > nob ?
1827                                     nob : aa->aa_ppga[i]->count;
1828
1829                         CDEBUG(D_CACHE, "page %p count %d\n",
1830                                aa->aa_ppga[i]->pg, count);
1831                         ptr = ll_kmap_atomic(aa->aa_ppga[i]->pg, KM_USER0);
1832                         memcpy(ptr + (aa->aa_ppga[i]->off & ~PAGE_MASK), buf,
1833                                count);
1834                         ll_kunmap_atomic((void *) ptr, KM_USER0);
1835
1836                         buf += count;
1837                         nob -= count;
1838                         i++;
1839                         pg_count--;
1840                 }
1841         }
1842
1843         if (rc < aa->aa_requested_nob)
1844                 handle_short_read(rc, aa->aa_page_count, aa->aa_ppga);
1845
1846         if (body->oa.o_valid & OBD_MD_FLCKSUM) {
1847                 static int cksum_counter;
1848                 u32        server_cksum = body->oa.o_cksum;
1849                 char      *via = "";
1850                 char      *router = "";
1851                 enum cksum_types cksum_type;
1852                 u32 o_flags = body->oa.o_valid & OBD_MD_FLFLAGS ?
1853                         body->oa.o_flags : 0;
1854
1855                 cksum_type = obd_cksum_type_unpack(o_flags);
1856                 rc = osc_checksum_bulk_rw(obd_name, cksum_type, rc,
1857                                           aa->aa_page_count, aa->aa_ppga,
1858                                           OST_READ, &client_cksum);
1859                 if (rc < 0)
1860                         GOTO(out, rc);
1861
1862                 if (req->rq_bulk != NULL &&
1863                     peer->nid != req->rq_bulk->bd_sender) {
1864                         via = " via ";
1865                         router = libcfs_nid2str(req->rq_bulk->bd_sender);
1866                 }
1867
1868                 if (server_cksum != client_cksum) {
1869                         struct ost_body *clbody;
1870                         u32 page_count = aa->aa_page_count;
1871
1872                         clbody = req_capsule_client_get(&req->rq_pill,
1873                                                         &RMF_OST_BODY);
1874                         if (cli->cl_checksum_dump)
1875                                 dump_all_bulk_pages(&clbody->oa, page_count,
1876                                                     aa->aa_ppga, server_cksum,
1877                                                     client_cksum);
1878
1879                         LCONSOLE_ERROR_MSG(0x133, "%s: BAD READ CHECKSUM: from "
1880                                            "%s%s%s inode "DFID" object "DOSTID
1881                                            " extent [%llu-%llu], client %x, "
1882                                            "server %x, cksum_type %x\n",
1883                                            obd_name,
1884                                            libcfs_nid2str(peer->nid),
1885                                            via, router,
1886                                            clbody->oa.o_valid & OBD_MD_FLFID ?
1887                                                 clbody->oa.o_parent_seq : 0ULL,
1888                                            clbody->oa.o_valid & OBD_MD_FLFID ?
1889                                                 clbody->oa.o_parent_oid : 0,
1890                                            clbody->oa.o_valid & OBD_MD_FLFID ?
1891                                                 clbody->oa.o_parent_ver : 0,
1892                                            POSTID(&body->oa.o_oi),
1893                                            aa->aa_ppga[0]->off,
1894                                            aa->aa_ppga[page_count-1]->off +
1895                                            aa->aa_ppga[page_count-1]->count - 1,
1896                                            client_cksum, server_cksum,
1897                                            cksum_type);
1898                         cksum_counter = 0;
1899                         aa->aa_oa->o_cksum = client_cksum;
1900                         rc = -EAGAIN;
1901                 } else {
1902                         cksum_counter++;
1903                         CDEBUG(D_PAGE, "checksum %x confirmed\n", client_cksum);
1904                         rc = 0;
1905                 }
1906         } else if (unlikely(client_cksum)) {
1907                 static int cksum_missed;
1908
1909                 cksum_missed++;
1910                 if ((cksum_missed & (-cksum_missed)) == cksum_missed)
1911                         CERROR("%s: checksum %u requested from %s but not sent\n",
1912                                obd_name, cksum_missed,
1913                                libcfs_nid2str(peer->nid));
1914         } else {
1915                 rc = 0;
1916         }
1917 out:
1918         if (rc >= 0)
1919                 lustre_get_wire_obdo(&req->rq_import->imp_connect_data,
1920                                      aa->aa_oa, &body->oa);
1921
1922         RETURN(rc);
1923 }
1924
1925 static int osc_brw_redo_request(struct ptlrpc_request *request,
1926                                 struct osc_brw_async_args *aa, int rc)
1927 {
1928         struct ptlrpc_request *new_req;
1929         struct osc_brw_async_args *new_aa;
1930         struct osc_async_page *oap;
1931         ENTRY;
1932
1933         /* The below message is checked in replay-ost-single.sh test_8ae*/
1934         DEBUG_REQ(rc == -EINPROGRESS ? D_RPCTRACE : D_ERROR, request,
1935                   "redo for recoverable error %d", rc);
1936
1937         rc = osc_brw_prep_request(lustre_msg_get_opc(request->rq_reqmsg) ==
1938                                 OST_WRITE ? OBD_BRW_WRITE : OBD_BRW_READ,
1939                                   aa->aa_cli, aa->aa_oa, aa->aa_page_count,
1940                                   aa->aa_ppga, &new_req, 1);
1941         if (rc)
1942                 RETURN(rc);
1943
1944         list_for_each_entry(oap, &aa->aa_oaps, oap_rpc_item) {
1945                 if (oap->oap_request != NULL) {
1946                         LASSERTF(request == oap->oap_request,
1947                                  "request %p != oap_request %p\n",
1948                                  request, oap->oap_request);
1949                         if (oap->oap_interrupted) {
1950                                 ptlrpc_req_finished(new_req);
1951                                 RETURN(-EINTR);
1952                         }
1953                 }
1954         }
1955         /*
1956          * New request takes over pga and oaps from old request.
1957          * Note that copying a list_head doesn't work, need to move it...
1958          */
1959         aa->aa_resends++;
1960         new_req->rq_interpret_reply = request->rq_interpret_reply;
1961         new_req->rq_async_args = request->rq_async_args;
1962         new_req->rq_commit_cb = request->rq_commit_cb;
1963         /* cap resend delay to the current request timeout, this is similar to
1964          * what ptlrpc does (see after_reply()) */
1965         if (aa->aa_resends > new_req->rq_timeout)
1966                 new_req->rq_sent = ktime_get_real_seconds() + new_req->rq_timeout;
1967         else
1968                 new_req->rq_sent = ktime_get_real_seconds() + aa->aa_resends;
1969         new_req->rq_generation_set = 1;
1970         new_req->rq_import_generation = request->rq_import_generation;
1971
1972         new_aa = ptlrpc_req_async_args(new_aa, new_req);
1973
1974         INIT_LIST_HEAD(&new_aa->aa_oaps);
1975         list_splice_init(&aa->aa_oaps, &new_aa->aa_oaps);
1976         INIT_LIST_HEAD(&new_aa->aa_exts);
1977         list_splice_init(&aa->aa_exts, &new_aa->aa_exts);
1978         new_aa->aa_resends = aa->aa_resends;
1979
1980         list_for_each_entry(oap, &new_aa->aa_oaps, oap_rpc_item) {
1981                 if (oap->oap_request) {
1982                         ptlrpc_req_finished(oap->oap_request);
1983                         oap->oap_request = ptlrpc_request_addref(new_req);
1984                 }
1985         }
1986
1987         /* XXX: This code will run into problem if we're going to support
1988          * to add a series of BRW RPCs into a self-defined ptlrpc_request_set
1989          * and wait for all of them to be finished. We should inherit request
1990          * set from old request. */
1991         ptlrpcd_add_req(new_req);
1992
1993         DEBUG_REQ(D_INFO, new_req, "new request");
1994         RETURN(0);
1995 }
1996
1997 /*
1998  * ugh, we want disk allocation on the target to happen in offset order.  we'll
1999  * follow sedgewicks advice and stick to the dead simple shellsort -- it'll do
2000  * fine for our small page arrays and doesn't require allocation.  its an
2001  * insertion sort that swaps elements that are strides apart, shrinking the
2002  * stride down until its '1' and the array is sorted.
2003  */
2004 static void sort_brw_pages(struct brw_page **array, int num)
2005 {
2006         int stride, i, j;
2007         struct brw_page *tmp;
2008
2009         if (num == 1)
2010                 return;
2011         for (stride = 1; stride < num ; stride = (stride * 3) + 1)
2012                 ;
2013
2014         do {
2015                 stride /= 3;
2016                 for (i = stride ; i < num ; i++) {
2017                         tmp = array[i];
2018                         j = i;
2019                         while (j >= stride && array[j - stride]->off > tmp->off) {
2020                                 array[j] = array[j - stride];
2021                                 j -= stride;
2022                         }
2023                         array[j] = tmp;
2024                 }
2025         } while (stride > 1);
2026 }
2027
2028 static void osc_release_ppga(struct brw_page **ppga, size_t count)
2029 {
2030         LASSERT(ppga != NULL);
2031         OBD_FREE(ppga, sizeof(*ppga) * count);
2032 }
2033
2034 static int brw_interpret(const struct lu_env *env,
2035                          struct ptlrpc_request *req, void *args, int rc)
2036 {
2037         struct osc_brw_async_args *aa = args;
2038         struct osc_extent *ext;
2039         struct osc_extent *tmp;
2040         struct client_obd *cli = aa->aa_cli;
2041         unsigned long transferred = 0;
2042
2043         ENTRY;
2044
2045         rc = osc_brw_fini_request(req, rc);
2046         CDEBUG(D_INODE, "request %p aa %p rc %d\n", req, aa, rc);
2047         /*
2048          * When server returns -EINPROGRESS, client should always retry
2049          * regardless of the number of times the bulk was resent already.
2050          */
2051         if (osc_recoverable_error(rc) && !req->rq_no_delay) {
2052                 if (req->rq_import_generation !=
2053                     req->rq_import->imp_generation) {
2054                         CDEBUG(D_HA, "%s: resend cross eviction for object: "
2055                                ""DOSTID", rc = %d.\n",
2056                                req->rq_import->imp_obd->obd_name,
2057                                POSTID(&aa->aa_oa->o_oi), rc);
2058                 } else if (rc == -EINPROGRESS ||
2059                     client_should_resend(aa->aa_resends, aa->aa_cli)) {
2060                         rc = osc_brw_redo_request(req, aa, rc);
2061                 } else {
2062                         CERROR("%s: too many resent retries for object: "
2063                                "%llu:%llu, rc = %d.\n",
2064                                req->rq_import->imp_obd->obd_name,
2065                                POSTID(&aa->aa_oa->o_oi), rc);
2066                 }
2067
2068                 if (rc == 0)
2069                         RETURN(0);
2070                 else if (rc == -EAGAIN || rc == -EINPROGRESS)
2071                         rc = -EIO;
2072         }
2073
2074         if (rc == 0) {
2075                 struct obdo *oa = aa->aa_oa;
2076                 struct cl_attr *attr = &osc_env_info(env)->oti_attr;
2077                 unsigned long valid = 0;
2078                 struct cl_object *obj;
2079                 struct osc_async_page *last;
2080
2081                 last = brw_page2oap(aa->aa_ppga[aa->aa_page_count - 1]);
2082                 obj = osc2cl(last->oap_obj);
2083
2084                 cl_object_attr_lock(obj);
2085                 if (oa->o_valid & OBD_MD_FLBLOCKS) {
2086                         attr->cat_blocks = oa->o_blocks;
2087                         valid |= CAT_BLOCKS;
2088                 }
2089                 if (oa->o_valid & OBD_MD_FLMTIME) {
2090                         attr->cat_mtime = oa->o_mtime;
2091                         valid |= CAT_MTIME;
2092                 }
2093                 if (oa->o_valid & OBD_MD_FLATIME) {
2094                         attr->cat_atime = oa->o_atime;
2095                         valid |= CAT_ATIME;
2096                 }
2097                 if (oa->o_valid & OBD_MD_FLCTIME) {
2098                         attr->cat_ctime = oa->o_ctime;
2099                         valid |= CAT_CTIME;
2100                 }
2101
2102                 if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE) {
2103                         struct lov_oinfo *loi = cl2osc(obj)->oo_oinfo;
2104                         loff_t last_off = last->oap_count + last->oap_obj_off +
2105                                 last->oap_page_off;
2106
2107                         /* Change file size if this is an out of quota or
2108                          * direct IO write and it extends the file size */
2109                         if (loi->loi_lvb.lvb_size < last_off) {
2110                                 attr->cat_size = last_off;
2111                                 valid |= CAT_SIZE;
2112                         }
2113                         /* Extend KMS if it's not a lockless write */
2114                         if (loi->loi_kms < last_off &&
2115                             oap2osc_page(last)->ops_srvlock == 0) {
2116                                 attr->cat_kms = last_off;
2117                                 valid |= CAT_KMS;
2118                         }
2119                 }
2120
2121                 if (valid != 0)
2122                         cl_object_attr_update(env, obj, attr, valid);
2123                 cl_object_attr_unlock(obj);
2124         }
2125         OBD_SLAB_FREE_PTR(aa->aa_oa, osc_obdo_kmem);
2126         aa->aa_oa = NULL;
2127
2128         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE && rc == 0)
2129                 osc_inc_unstable_pages(req);
2130
2131         list_for_each_entry_safe(ext, tmp, &aa->aa_exts, oe_link) {
2132                 list_del_init(&ext->oe_link);
2133                 osc_extent_finish(env, ext, 1,
2134                                   rc && req->rq_no_delay ? -EWOULDBLOCK : rc);
2135         }
2136         LASSERT(list_empty(&aa->aa_exts));
2137         LASSERT(list_empty(&aa->aa_oaps));
2138
2139         transferred = (req->rq_bulk == NULL ? /* short io */
2140                        aa->aa_requested_nob :
2141                        req->rq_bulk->bd_nob_transferred);
2142
2143         osc_release_ppga(aa->aa_ppga, aa->aa_page_count);
2144         ptlrpc_lprocfs_brw(req, transferred);
2145
2146         spin_lock(&cli->cl_loi_list_lock);
2147         /* We need to decrement before osc_ap_completion->osc_wake_cache_waiters
2148          * is called so we know whether to go to sync BRWs or wait for more
2149          * RPCs to complete */
2150         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE)
2151                 cli->cl_w_in_flight--;
2152         else
2153                 cli->cl_r_in_flight--;
2154         osc_wake_cache_waiters(cli);
2155         spin_unlock(&cli->cl_loi_list_lock);
2156
2157         osc_io_unplug(env, cli, NULL);
2158         RETURN(rc);
2159 }
2160
2161 static void brw_commit(struct ptlrpc_request *req)
2162 {
2163         /* If osc_inc_unstable_pages (via osc_extent_finish) races with
2164          * this called via the rq_commit_cb, I need to ensure
2165          * osc_dec_unstable_pages is still called. Otherwise unstable
2166          * pages may be leaked. */
2167         spin_lock(&req->rq_lock);
2168         if (likely(req->rq_unstable)) {
2169                 req->rq_unstable = 0;
2170                 spin_unlock(&req->rq_lock);
2171
2172                 osc_dec_unstable_pages(req);
2173         } else {
2174                 req->rq_committed = 1;
2175                 spin_unlock(&req->rq_lock);
2176         }
2177 }
2178
2179 /**
2180  * Build an RPC by the list of extent @ext_list. The caller must ensure
2181  * that the total pages in this list are NOT over max pages per RPC.
2182  * Extents in the list must be in OES_RPC state.
2183  */
2184 int osc_build_rpc(const struct lu_env *env, struct client_obd *cli,
2185                   struct list_head *ext_list, int cmd)
2186 {
2187         struct ptlrpc_request           *req = NULL;
2188         struct osc_extent               *ext;
2189         struct brw_page                 **pga = NULL;
2190         struct osc_brw_async_args       *aa = NULL;
2191         struct obdo                     *oa = NULL;
2192         struct osc_async_page           *oap;
2193         struct osc_object               *obj = NULL;
2194         struct cl_req_attr              *crattr = NULL;
2195         loff_t                          starting_offset = OBD_OBJECT_EOF;
2196         loff_t                          ending_offset = 0;
2197         int                             mpflag = 0;
2198         int                             mem_tight = 0;
2199         int                             page_count = 0;
2200         bool                            soft_sync = false;
2201         bool                            interrupted = false;
2202         bool                            ndelay = false;
2203         int                             i;
2204         int                             grant = 0;
2205         int                             rc;
2206         __u32                           layout_version = 0;
2207         struct list_head                rpc_list = LIST_HEAD_INIT(rpc_list);
2208         struct ost_body                 *body;
2209         ENTRY;
2210         LASSERT(!list_empty(ext_list));
2211
2212         /* add pages into rpc_list to build BRW rpc */
2213         list_for_each_entry(ext, ext_list, oe_link) {
2214                 LASSERT(ext->oe_state == OES_RPC);
2215                 mem_tight |= ext->oe_memalloc;
2216                 grant += ext->oe_grants;
2217                 page_count += ext->oe_nr_pages;
2218                 layout_version = MAX(layout_version, ext->oe_layout_version);
2219                 if (obj == NULL)
2220                         obj = ext->oe_obj;
2221         }
2222
2223         soft_sync = osc_over_unstable_soft_limit(cli);
2224         if (mem_tight)
2225                 mpflag = cfs_memory_pressure_get_and_set();
2226
2227         OBD_ALLOC(pga, sizeof(*pga) * page_count);
2228         if (pga == NULL)
2229                 GOTO(out, rc = -ENOMEM);
2230
2231         OBD_SLAB_ALLOC_PTR_GFP(oa, osc_obdo_kmem, GFP_NOFS);
2232         if (oa == NULL)
2233                 GOTO(out, rc = -ENOMEM);
2234
2235         i = 0;
2236         list_for_each_entry(ext, ext_list, oe_link) {
2237                 list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) {
2238                         if (mem_tight)
2239                                 oap->oap_brw_flags |= OBD_BRW_MEMALLOC;
2240                         if (soft_sync)
2241                                 oap->oap_brw_flags |= OBD_BRW_SOFT_SYNC;
2242                         pga[i] = &oap->oap_brw_page;
2243                         pga[i]->off = oap->oap_obj_off + oap->oap_page_off;
2244                         i++;
2245
2246                         list_add_tail(&oap->oap_rpc_item, &rpc_list);
2247                         if (starting_offset == OBD_OBJECT_EOF ||
2248                             starting_offset > oap->oap_obj_off)
2249                                 starting_offset = oap->oap_obj_off;
2250                         else
2251                                 LASSERT(oap->oap_page_off == 0);
2252                         if (ending_offset < oap->oap_obj_off + oap->oap_count)
2253                                 ending_offset = oap->oap_obj_off +
2254                                                 oap->oap_count;
2255                         else
2256                                 LASSERT(oap->oap_page_off + oap->oap_count ==
2257                                         PAGE_SIZE);
2258                         if (oap->oap_interrupted)
2259                                 interrupted = true;
2260                 }
2261                 if (ext->oe_ndelay)
2262                         ndelay = true;
2263         }
2264
2265         /* first page in the list */
2266         oap = list_entry(rpc_list.next, typeof(*oap), oap_rpc_item);
2267
2268         crattr = &osc_env_info(env)->oti_req_attr;
2269         memset(crattr, 0, sizeof(*crattr));
2270         crattr->cra_type = (cmd & OBD_BRW_WRITE) ? CRT_WRITE : CRT_READ;
2271         crattr->cra_flags = ~0ULL;
2272         crattr->cra_page = oap2cl_page(oap);
2273         crattr->cra_oa = oa;
2274         cl_req_attr_set(env, osc2cl(obj), crattr);
2275
2276         if (cmd == OBD_BRW_WRITE) {
2277                 oa->o_grant_used = grant;
2278                 if (layout_version > 0) {
2279                         CDEBUG(D_LAYOUT, DFID": write with layout version %u\n",
2280                                PFID(&oa->o_oi.oi_fid), layout_version);
2281
2282                         oa->o_layout_version = layout_version;
2283                         oa->o_valid |= OBD_MD_LAYOUT_VERSION;
2284                 }
2285         }
2286
2287         sort_brw_pages(pga, page_count);
2288         rc = osc_brw_prep_request(cmd, cli, oa, page_count, pga, &req, 0);
2289         if (rc != 0) {
2290                 CERROR("prep_req failed: %d\n", rc);
2291                 GOTO(out, rc);
2292         }
2293
2294         req->rq_commit_cb = brw_commit;
2295         req->rq_interpret_reply = brw_interpret;
2296         req->rq_memalloc = mem_tight != 0;
2297         oap->oap_request = ptlrpc_request_addref(req);
2298         if (interrupted && !req->rq_intr)
2299                 ptlrpc_mark_interrupted(req);
2300         if (ndelay) {
2301                 req->rq_no_resend = req->rq_no_delay = 1;
2302                 /* probably set a shorter timeout value.
2303                  * to handle ETIMEDOUT in brw_interpret() correctly. */
2304                 /* lustre_msg_set_timeout(req, req->rq_timeout / 2); */
2305         }
2306
2307         /* Need to update the timestamps after the request is built in case
2308          * we race with setattr (locally or in queue at OST).  If OST gets
2309          * later setattr before earlier BRW (as determined by the request xid),
2310          * the OST will not use BRW timestamps.  Sadly, there is no obvious
2311          * way to do this in a single call.  bug 10150 */
2312         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
2313         crattr->cra_oa = &body->oa;
2314         crattr->cra_flags = OBD_MD_FLMTIME | OBD_MD_FLCTIME | OBD_MD_FLATIME;
2315         cl_req_attr_set(env, osc2cl(obj), crattr);
2316         lustre_msg_set_jobid(req->rq_reqmsg, crattr->cra_jobid);
2317
2318         aa = ptlrpc_req_async_args(aa, req);
2319         INIT_LIST_HEAD(&aa->aa_oaps);
2320         list_splice_init(&rpc_list, &aa->aa_oaps);
2321         INIT_LIST_HEAD(&aa->aa_exts);
2322         list_splice_init(ext_list, &aa->aa_exts);
2323
2324         spin_lock(&cli->cl_loi_list_lock);
2325         starting_offset >>= PAGE_SHIFT;
2326         if (cmd == OBD_BRW_READ) {
2327                 cli->cl_r_in_flight++;
2328                 lprocfs_oh_tally_log2(&cli->cl_read_page_hist, page_count);
2329                 lprocfs_oh_tally(&cli->cl_read_rpc_hist, cli->cl_r_in_flight);
2330                 lprocfs_oh_tally_log2(&cli->cl_read_offset_hist,
2331                                       starting_offset + 1);
2332         } else {
2333                 cli->cl_w_in_flight++;
2334                 lprocfs_oh_tally_log2(&cli->cl_write_page_hist, page_count);
2335                 lprocfs_oh_tally(&cli->cl_write_rpc_hist, cli->cl_w_in_flight);
2336                 lprocfs_oh_tally_log2(&cli->cl_write_offset_hist,
2337                                       starting_offset + 1);
2338         }
2339         spin_unlock(&cli->cl_loi_list_lock);
2340
2341         DEBUG_REQ(D_INODE, req, "%d pages, aa %p, now %ur/%uw in flight",
2342                   page_count, aa, cli->cl_r_in_flight,
2343                   cli->cl_w_in_flight);
2344         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_DELAY_IO, cfs_fail_val);
2345
2346         ptlrpcd_add_req(req);
2347         rc = 0;
2348         EXIT;
2349
2350 out:
2351         if (mem_tight != 0)
2352                 cfs_memory_pressure_restore(mpflag);
2353
2354         if (rc != 0) {
2355                 LASSERT(req == NULL);
2356
2357                 if (oa)
2358                         OBD_SLAB_FREE_PTR(oa, osc_obdo_kmem);
2359                 if (pga)
2360                         OBD_FREE(pga, sizeof(*pga) * page_count);
2361                 /* this should happen rarely and is pretty bad, it makes the
2362                  * pending list not follow the dirty order */
2363                 while (!list_empty(ext_list)) {
2364                         ext = list_entry(ext_list->next, struct osc_extent,
2365                                          oe_link);
2366                         list_del_init(&ext->oe_link);
2367                         osc_extent_finish(env, ext, 0, rc);
2368                 }
2369         }
2370         RETURN(rc);
2371 }
2372
2373 static int osc_set_lock_data(struct ldlm_lock *lock, void *data)
2374 {
2375         int set = 0;
2376
2377         LASSERT(lock != NULL);
2378
2379         lock_res_and_lock(lock);
2380
2381         if (lock->l_ast_data == NULL)
2382                 lock->l_ast_data = data;
2383         if (lock->l_ast_data == data)
2384                 set = 1;
2385
2386         unlock_res_and_lock(lock);
2387
2388         return set;
2389 }
2390
2391 int osc_enqueue_fini(struct ptlrpc_request *req, osc_enqueue_upcall_f upcall,
2392                      void *cookie, struct lustre_handle *lockh,
2393                      enum ldlm_mode mode, __u64 *flags, bool speculative,
2394                      int errcode)
2395 {
2396         bool intent = *flags & LDLM_FL_HAS_INTENT;
2397         int rc;
2398         ENTRY;
2399
2400         /* The request was created before ldlm_cli_enqueue call. */
2401         if (intent && errcode == ELDLM_LOCK_ABORTED) {
2402                 struct ldlm_reply *rep;
2403
2404                 rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
2405                 LASSERT(rep != NULL);
2406
2407                 rep->lock_policy_res1 =
2408                         ptlrpc_status_ntoh(rep->lock_policy_res1);
2409                 if (rep->lock_policy_res1)
2410                         errcode = rep->lock_policy_res1;
2411                 if (!speculative)
2412                         *flags |= LDLM_FL_LVB_READY;
2413         } else if (errcode == ELDLM_OK) {
2414                 *flags |= LDLM_FL_LVB_READY;
2415         }
2416
2417         /* Call the update callback. */
2418         rc = (*upcall)(cookie, lockh, errcode);
2419
2420         /* release the reference taken in ldlm_cli_enqueue() */
2421         if (errcode == ELDLM_LOCK_MATCHED)
2422                 errcode = ELDLM_OK;
2423         if (errcode == ELDLM_OK && lustre_handle_is_used(lockh))
2424                 ldlm_lock_decref(lockh, mode);
2425
2426         RETURN(rc);
2427 }
2428
2429 int osc_enqueue_interpret(const struct lu_env *env, struct ptlrpc_request *req,
2430                           void *args, int rc)
2431 {
2432         struct osc_enqueue_args *aa = args;
2433         struct ldlm_lock *lock;
2434         struct lustre_handle *lockh = &aa->oa_lockh;
2435         enum ldlm_mode mode = aa->oa_mode;
2436         struct ost_lvb *lvb = aa->oa_lvb;
2437         __u32 lvb_len = sizeof(*lvb);
2438         __u64 flags = 0;
2439
2440         ENTRY;
2441
2442         /* ldlm_cli_enqueue is holding a reference on the lock, so it must
2443          * be valid. */
2444         lock = ldlm_handle2lock(lockh);
2445         LASSERTF(lock != NULL,
2446                  "lockh %#llx, req %p, aa %p - client evicted?\n",
2447                  lockh->cookie, req, aa);
2448
2449         /* Take an additional reference so that a blocking AST that
2450          * ldlm_cli_enqueue_fini() might post for a failed lock, is guaranteed
2451          * to arrive after an upcall has been executed by
2452          * osc_enqueue_fini(). */
2453         ldlm_lock_addref(lockh, mode);
2454
2455         /* Let cl_lock_state_wait fail with -ERESTARTSYS to unuse sublocks. */
2456         OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_ENQUEUE_HANG, 2);
2457
2458         /* Let CP AST to grant the lock first. */
2459         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_ENQ_RACE, 1);
2460
2461         if (aa->oa_speculative) {
2462                 LASSERT(aa->oa_lvb == NULL);
2463                 LASSERT(aa->oa_flags == NULL);
2464                 aa->oa_flags = &flags;
2465         }
2466
2467         /* Complete obtaining the lock procedure. */
2468         rc = ldlm_cli_enqueue_fini(aa->oa_exp, req, aa->oa_type, 1,
2469                                    aa->oa_mode, aa->oa_flags, lvb, lvb_len,
2470                                    lockh, rc);
2471         /* Complete osc stuff. */
2472         rc = osc_enqueue_fini(req, aa->oa_upcall, aa->oa_cookie, lockh, mode,
2473                               aa->oa_flags, aa->oa_speculative, rc);
2474
2475         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_CANCEL_RACE, 10);
2476
2477         ldlm_lock_decref(lockh, mode);
2478         LDLM_LOCK_PUT(lock);
2479         RETURN(rc);
2480 }
2481
2482 struct ptlrpc_request_set *PTLRPCD_SET = (void *)1;
2483
2484 /* When enqueuing asynchronously, locks are not ordered, we can obtain a lock
2485  * from the 2nd OSC before a lock from the 1st one. This does not deadlock with
2486  * other synchronous requests, however keeping some locks and trying to obtain
2487  * others may take a considerable amount of time in a case of ost failure; and
2488  * when other sync requests do not get released lock from a client, the client
2489  * is evicted from the cluster -- such scenarious make the life difficult, so
2490  * release locks just after they are obtained. */
2491 int osc_enqueue_base(struct obd_export *exp, struct ldlm_res_id *res_id,
2492                      __u64 *flags, union ldlm_policy_data *policy,
2493                      struct ost_lvb *lvb, osc_enqueue_upcall_f upcall,
2494                      void *cookie, struct ldlm_enqueue_info *einfo,
2495                      struct ptlrpc_request_set *rqset, int async,
2496                      bool speculative)
2497 {
2498         struct obd_device *obd = exp->exp_obd;
2499         struct lustre_handle lockh = { 0 };
2500         struct ptlrpc_request *req = NULL;
2501         int intent = *flags & LDLM_FL_HAS_INTENT;
2502         __u64 match_flags = *flags;
2503         enum ldlm_mode mode;
2504         int rc;
2505         ENTRY;
2506
2507         /* Filesystem lock extents are extended to page boundaries so that
2508          * dealing with the page cache is a little smoother.  */
2509         policy->l_extent.start -= policy->l_extent.start & ~PAGE_MASK;
2510         policy->l_extent.end |= ~PAGE_MASK;
2511
2512         /* Next, search for already existing extent locks that will cover us */
2513         /* If we're trying to read, we also search for an existing PW lock.  The
2514          * VFS and page cache already protect us locally, so lots of readers/
2515          * writers can share a single PW lock.
2516          *
2517          * There are problems with conversion deadlocks, so instead of
2518          * converting a read lock to a write lock, we'll just enqueue a new
2519          * one.
2520          *
2521          * At some point we should cancel the read lock instead of making them
2522          * send us a blocking callback, but there are problems with canceling
2523          * locks out from other users right now, too. */
2524         mode = einfo->ei_mode;
2525         if (einfo->ei_mode == LCK_PR)
2526                 mode |= LCK_PW;
2527         /* Normal lock requests must wait for the LVB to be ready before
2528          * matching a lock; speculative lock requests do not need to,
2529          * because they will not actually use the lock. */
2530         if (!speculative)
2531                 match_flags |= LDLM_FL_LVB_READY;
2532         if (intent != 0)
2533                 match_flags |= LDLM_FL_BLOCK_GRANTED;
2534         mode = ldlm_lock_match(obd->obd_namespace, match_flags, res_id,
2535                                einfo->ei_type, policy, mode, &lockh, 0);
2536         if (mode) {
2537                 struct ldlm_lock *matched;
2538
2539                 if (*flags & LDLM_FL_TEST_LOCK)
2540                         RETURN(ELDLM_OK);
2541
2542                 matched = ldlm_handle2lock(&lockh);
2543                 if (speculative) {
2544                         /* This DLM lock request is speculative, and does not
2545                          * have an associated IO request. Therefore if there
2546                          * is already a DLM lock, it wll just inform the
2547                          * caller to cancel the request for this stripe.*/
2548                         lock_res_and_lock(matched);
2549                         if (ldlm_extent_equal(&policy->l_extent,
2550                             &matched->l_policy_data.l_extent))
2551                                 rc = -EEXIST;
2552                         else
2553                                 rc = -ECANCELED;
2554                         unlock_res_and_lock(matched);
2555
2556                         ldlm_lock_decref(&lockh, mode);
2557                         LDLM_LOCK_PUT(matched);
2558                         RETURN(rc);
2559                 } else if (osc_set_lock_data(matched, einfo->ei_cbdata)) {
2560                         *flags |= LDLM_FL_LVB_READY;
2561
2562                         /* We already have a lock, and it's referenced. */
2563                         (*upcall)(cookie, &lockh, ELDLM_LOCK_MATCHED);
2564
2565                         ldlm_lock_decref(&lockh, mode);
2566                         LDLM_LOCK_PUT(matched);
2567                         RETURN(ELDLM_OK);
2568                 } else {
2569                         ldlm_lock_decref(&lockh, mode);
2570                         LDLM_LOCK_PUT(matched);
2571                 }
2572         }
2573
2574         if (*flags & (LDLM_FL_TEST_LOCK | LDLM_FL_MATCH_LOCK))
2575                 RETURN(-ENOLCK);
2576
2577         if (intent) {
2578                 req = ptlrpc_request_alloc(class_exp2cliimp(exp),
2579                                            &RQF_LDLM_ENQUEUE_LVB);
2580                 if (req == NULL)
2581                         RETURN(-ENOMEM);
2582
2583                 rc = ldlm_prep_enqueue_req(exp, req, NULL, 0);
2584                 if (rc) {
2585                         ptlrpc_request_free(req);
2586                         RETURN(rc);
2587                 }
2588
2589                 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
2590                                      sizeof *lvb);
2591                 ptlrpc_request_set_replen(req);
2592         }
2593
2594         /* users of osc_enqueue() can pass this flag for ldlm_lock_match() */
2595         *flags &= ~LDLM_FL_BLOCK_GRANTED;
2596
2597         rc = ldlm_cli_enqueue(exp, &req, einfo, res_id, policy, flags, lvb,
2598                               sizeof(*lvb), LVB_T_OST, &lockh, async);
2599         if (async) {
2600                 if (!rc) {
2601                         struct osc_enqueue_args *aa;
2602                         aa = ptlrpc_req_async_args(aa, req);
2603                         aa->oa_exp         = exp;
2604                         aa->oa_mode        = einfo->ei_mode;
2605                         aa->oa_type        = einfo->ei_type;
2606                         lustre_handle_copy(&aa->oa_lockh, &lockh);
2607                         aa->oa_upcall      = upcall;
2608                         aa->oa_cookie      = cookie;
2609                         aa->oa_speculative = speculative;
2610                         if (!speculative) {
2611                                 aa->oa_flags  = flags;
2612                                 aa->oa_lvb    = lvb;
2613                         } else {
2614                                 /* speculative locks are essentially to enqueue
2615                                  * a DLM lock  in advance, so we don't care
2616                                  * about the result of the enqueue. */
2617                                 aa->oa_lvb    = NULL;
2618                                 aa->oa_flags  = NULL;
2619                         }
2620
2621                         req->rq_interpret_reply = osc_enqueue_interpret;
2622                         if (rqset == PTLRPCD_SET)
2623                                 ptlrpcd_add_req(req);
2624                         else
2625                                 ptlrpc_set_add_req(rqset, req);
2626                 } else if (intent) {
2627                         ptlrpc_req_finished(req);
2628                 }
2629                 RETURN(rc);
2630         }
2631
2632         rc = osc_enqueue_fini(req, upcall, cookie, &lockh, einfo->ei_mode,
2633                               flags, speculative, rc);
2634         if (intent)
2635                 ptlrpc_req_finished(req);
2636
2637         RETURN(rc);
2638 }
2639
2640 int osc_match_base(const struct lu_env *env, struct obd_export *exp,
2641                    struct ldlm_res_id *res_id, enum ldlm_type type,
2642                    union ldlm_policy_data *policy, enum ldlm_mode mode,
2643                    __u64 *flags, struct osc_object *obj,
2644                    struct lustre_handle *lockh, int unref)
2645 {
2646         struct obd_device *obd = exp->exp_obd;
2647         __u64 lflags = *flags;
2648         enum ldlm_mode rc;
2649         ENTRY;
2650
2651         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_MATCH))
2652                 RETURN(-EIO);
2653
2654         /* Filesystem lock extents are extended to page boundaries so that
2655          * dealing with the page cache is a little smoother */
2656         policy->l_extent.start -= policy->l_extent.start & ~PAGE_MASK;
2657         policy->l_extent.end |= ~PAGE_MASK;
2658
2659         /* Next, search for already existing extent locks that will cover us */
2660         /* If we're trying to read, we also search for an existing PW lock.  The
2661          * VFS and page cache already protect us locally, so lots of readers/
2662          * writers can share a single PW lock. */
2663         rc = mode;
2664         if (mode == LCK_PR)
2665                 rc |= LCK_PW;
2666         rc = ldlm_lock_match(obd->obd_namespace, lflags,
2667                              res_id, type, policy, rc, lockh, unref);
2668         if (rc == 0 || lflags & LDLM_FL_TEST_LOCK)
2669                 RETURN(rc);
2670
2671         if (obj != NULL) {
2672                 struct ldlm_lock *lock = ldlm_handle2lock(lockh);
2673
2674                 LASSERT(lock != NULL);
2675                 if (osc_set_lock_data(lock, obj)) {
2676                         lock_res_and_lock(lock);
2677                         if (!ldlm_is_lvb_cached(lock)) {
2678                                 LASSERT(lock->l_ast_data == obj);
2679                                 osc_lock_lvb_update(env, obj, lock, NULL);
2680                                 ldlm_set_lvb_cached(lock);
2681                         }
2682                         unlock_res_and_lock(lock);
2683                 } else {
2684                         ldlm_lock_decref(lockh, rc);
2685                         rc = 0;
2686                 }
2687                 LDLM_LOCK_PUT(lock);
2688         }
2689         RETURN(rc);
2690 }
2691
2692 static int osc_statfs_interpret(const struct lu_env *env,
2693                                 struct ptlrpc_request *req, void *args, int rc)
2694 {
2695         struct osc_async_args *aa = args;
2696         struct obd_statfs *msfs;
2697
2698         ENTRY;
2699         if (rc == -EBADR)
2700                 /*
2701                  * The request has in fact never been sent due to issues at
2702                  * a higher level (LOV).  Exit immediately since the caller
2703                  * is aware of the problem and takes care of the clean up.
2704                  */
2705                 RETURN(rc);
2706
2707         if ((rc == -ENOTCONN || rc == -EAGAIN) &&
2708             (aa->aa_oi->oi_flags & OBD_STATFS_NODELAY))
2709                 GOTO(out, rc = 0);
2710
2711         if (rc != 0)
2712                 GOTO(out, rc);
2713
2714         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
2715         if (msfs == NULL)
2716                 GOTO(out, rc = -EPROTO);
2717
2718         *aa->aa_oi->oi_osfs = *msfs;
2719 out:
2720         rc = aa->aa_oi->oi_cb_up(aa->aa_oi, rc);
2721
2722         RETURN(rc);
2723 }
2724
2725 static int osc_statfs_async(struct obd_export *exp,
2726                             struct obd_info *oinfo, time64_t max_age,
2727                             struct ptlrpc_request_set *rqset)
2728 {
2729         struct obd_device     *obd = class_exp2obd(exp);
2730         struct ptlrpc_request *req;
2731         struct osc_async_args *aa;
2732         int rc;
2733         ENTRY;
2734
2735         if (obd->obd_osfs_age >= max_age) {
2736                 CDEBUG(D_SUPER,
2737                        "%s: use %p cache blocks %llu/%llu objects %llu/%llu\n",
2738                        obd->obd_name, &obd->obd_osfs,
2739                        obd->obd_osfs.os_bavail, obd->obd_osfs.os_blocks,
2740                        obd->obd_osfs.os_ffree, obd->obd_osfs.os_files);
2741                 spin_lock(&obd->obd_osfs_lock);
2742                 memcpy(oinfo->oi_osfs, &obd->obd_osfs, sizeof(*oinfo->oi_osfs));
2743                 spin_unlock(&obd->obd_osfs_lock);
2744                 oinfo->oi_flags |= OBD_STATFS_FROM_CACHE;
2745                 if (oinfo->oi_cb_up)
2746                         oinfo->oi_cb_up(oinfo, 0);
2747
2748                 RETURN(0);
2749         }
2750
2751         /* We could possibly pass max_age in the request (as an absolute
2752          * timestamp or a "seconds.usec ago") so the target can avoid doing
2753          * extra calls into the filesystem if that isn't necessary (e.g.
2754          * during mount that would help a bit).  Having relative timestamps
2755          * is not so great if request processing is slow, while absolute
2756          * timestamps are not ideal because they need time synchronization. */
2757         req = ptlrpc_request_alloc(obd->u.cli.cl_import, &RQF_OST_STATFS);
2758         if (req == NULL)
2759                 RETURN(-ENOMEM);
2760
2761         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_STATFS);
2762         if (rc) {
2763                 ptlrpc_request_free(req);
2764                 RETURN(rc);
2765         }
2766         ptlrpc_request_set_replen(req);
2767         req->rq_request_portal = OST_CREATE_PORTAL;
2768         ptlrpc_at_set_req_timeout(req);
2769
2770         if (oinfo->oi_flags & OBD_STATFS_NODELAY) {
2771                 /* procfs requests not want stat in wait for avoid deadlock */
2772                 req->rq_no_resend = 1;
2773                 req->rq_no_delay = 1;
2774         }
2775
2776         req->rq_interpret_reply = osc_statfs_interpret;
2777         aa = ptlrpc_req_async_args(aa, req);
2778         aa->aa_oi = oinfo;
2779
2780         ptlrpc_set_add_req(rqset, req);
2781         RETURN(0);
2782 }
2783
2784 static int osc_statfs(const struct lu_env *env, struct obd_export *exp,
2785                       struct obd_statfs *osfs, time64_t max_age, __u32 flags)
2786 {
2787         struct obd_device     *obd = class_exp2obd(exp);
2788         struct obd_statfs     *msfs;
2789         struct ptlrpc_request *req;
2790         struct obd_import     *imp = NULL;
2791         int rc;
2792         ENTRY;
2793
2794
2795         /*Since the request might also come from lprocfs, so we need
2796          *sync this with client_disconnect_export Bug15684*/
2797         down_read(&obd->u.cli.cl_sem);
2798         if (obd->u.cli.cl_import)
2799                 imp = class_import_get(obd->u.cli.cl_import);
2800         up_read(&obd->u.cli.cl_sem);
2801         if (!imp)
2802                 RETURN(-ENODEV);
2803
2804         /* We could possibly pass max_age in the request (as an absolute
2805          * timestamp or a "seconds.usec ago") so the target can avoid doing
2806          * extra calls into the filesystem if that isn't necessary (e.g.
2807          * during mount that would help a bit).  Having relative timestamps
2808          * is not so great if request processing is slow, while absolute
2809          * timestamps are not ideal because they need time synchronization. */
2810         req = ptlrpc_request_alloc(imp, &RQF_OST_STATFS);
2811
2812         class_import_put(imp);
2813
2814         if (req == NULL)
2815                 RETURN(-ENOMEM);
2816
2817         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_STATFS);
2818         if (rc) {
2819                 ptlrpc_request_free(req);
2820                 RETURN(rc);
2821         }
2822         ptlrpc_request_set_replen(req);
2823         req->rq_request_portal = OST_CREATE_PORTAL;
2824         ptlrpc_at_set_req_timeout(req);
2825
2826         if (flags & OBD_STATFS_NODELAY) {
2827                 /* procfs requests not want stat in wait for avoid deadlock */
2828                 req->rq_no_resend = 1;
2829                 req->rq_no_delay = 1;
2830         }
2831
2832         rc = ptlrpc_queue_wait(req);
2833         if (rc)
2834                 GOTO(out, rc);
2835
2836         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
2837         if (msfs == NULL)
2838                 GOTO(out, rc = -EPROTO);
2839
2840         *osfs = *msfs;
2841
2842         EXIT;
2843 out:
2844         ptlrpc_req_finished(req);
2845         return rc;
2846 }
2847
2848 static int osc_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
2849                          void *karg, void __user *uarg)
2850 {
2851         struct obd_device *obd = exp->exp_obd;
2852         struct obd_ioctl_data *data = karg;
2853         int rc = 0;
2854
2855         ENTRY;
2856         if (!try_module_get(THIS_MODULE)) {
2857                 CERROR("%s: cannot get module '%s'\n", obd->obd_name,
2858                        module_name(THIS_MODULE));
2859                 return -EINVAL;
2860         }
2861         switch (cmd) {
2862         case OBD_IOC_CLIENT_RECOVER:
2863                 rc = ptlrpc_recover_import(obd->u.cli.cl_import,
2864                                            data->ioc_inlbuf1, 0);
2865                 if (rc > 0)
2866                         rc = 0;
2867                 break;
2868         case IOC_OSC_SET_ACTIVE:
2869                 rc = ptlrpc_set_import_active(obd->u.cli.cl_import,
2870                                               data->ioc_offset);
2871                 break;
2872         default:
2873                 rc = -ENOTTY;
2874                 CDEBUG(D_INODE, "%s: unrecognised ioctl %#x by %s: rc = %d\n",
2875                        obd->obd_name, cmd, current_comm(), rc);
2876                 break;
2877         }
2878
2879         module_put(THIS_MODULE);
2880         return rc;
2881 }
2882
2883 int osc_set_info_async(const struct lu_env *env, struct obd_export *exp,
2884                        u32 keylen, void *key, u32 vallen, void *val,
2885                        struct ptlrpc_request_set *set)
2886 {
2887         struct ptlrpc_request *req;
2888         struct obd_device     *obd = exp->exp_obd;
2889         struct obd_import     *imp = class_exp2cliimp(exp);
2890         char                  *tmp;
2891         int                    rc;
2892         ENTRY;
2893
2894         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_SHUTDOWN, 10);
2895
2896         if (KEY_IS(KEY_CHECKSUM)) {
2897                 if (vallen != sizeof(int))
2898                         RETURN(-EINVAL);
2899                 exp->exp_obd->u.cli.cl_checksum = (*(int *)val) ? 1 : 0;
2900                 RETURN(0);
2901         }
2902
2903         if (KEY_IS(KEY_SPTLRPC_CONF)) {
2904                 sptlrpc_conf_client_adapt(obd);
2905                 RETURN(0);
2906         }
2907
2908         if (KEY_IS(KEY_FLUSH_CTX)) {
2909                 sptlrpc_import_flush_my_ctx(imp);
2910                 RETURN(0);
2911         }
2912
2913         if (KEY_IS(KEY_CACHE_LRU_SHRINK)) {
2914                 struct client_obd *cli = &obd->u.cli;
2915                 long nr = atomic_long_read(&cli->cl_lru_in_list) >> 1;
2916                 long target = *(long *)val;
2917
2918                 nr = osc_lru_shrink(env, cli, min(nr, target), true);
2919                 *(long *)val -= nr;
2920                 RETURN(0);
2921         }
2922
2923         if (!set && !KEY_IS(KEY_GRANT_SHRINK))
2924                 RETURN(-EINVAL);
2925
2926         /* We pass all other commands directly to OST. Since nobody calls osc
2927            methods directly and everybody is supposed to go through LOV, we
2928            assume lov checked invalid values for us.
2929            The only recognised values so far are evict_by_nid and mds_conn.
2930            Even if something bad goes through, we'd get a -EINVAL from OST
2931            anyway. */
2932
2933         req = ptlrpc_request_alloc(imp, KEY_IS(KEY_GRANT_SHRINK) ?
2934                                                 &RQF_OST_SET_GRANT_INFO :
2935                                                 &RQF_OBD_SET_INFO);
2936         if (req == NULL)
2937                 RETURN(-ENOMEM);
2938
2939         req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_KEY,
2940                              RCL_CLIENT, keylen);
2941         if (!KEY_IS(KEY_GRANT_SHRINK))
2942                 req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_VAL,
2943                                      RCL_CLIENT, vallen);
2944         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SET_INFO);
2945         if (rc) {
2946                 ptlrpc_request_free(req);
2947                 RETURN(rc);
2948         }
2949
2950         tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
2951         memcpy(tmp, key, keylen);
2952         tmp = req_capsule_client_get(&req->rq_pill, KEY_IS(KEY_GRANT_SHRINK) ?
2953                                                         &RMF_OST_BODY :
2954                                                         &RMF_SETINFO_VAL);
2955         memcpy(tmp, val, vallen);
2956
2957         if (KEY_IS(KEY_GRANT_SHRINK)) {
2958                 struct osc_grant_args *aa;
2959                 struct obdo *oa;
2960
2961                 aa = ptlrpc_req_async_args(aa, req);
2962                 OBD_SLAB_ALLOC_PTR_GFP(oa, osc_obdo_kmem, GFP_NOFS);
2963                 if (!oa) {
2964                         ptlrpc_req_finished(req);
2965                         RETURN(-ENOMEM);
2966                 }
2967                 *oa = ((struct ost_body *)val)->oa;
2968                 aa->aa_oa = oa;
2969                 req->rq_interpret_reply = osc_shrink_grant_interpret;
2970         }
2971
2972         ptlrpc_request_set_replen(req);
2973         if (!KEY_IS(KEY_GRANT_SHRINK)) {
2974                 LASSERT(set != NULL);
2975                 ptlrpc_set_add_req(set, req);
2976                 ptlrpc_check_set(NULL, set);
2977         } else {
2978                 ptlrpcd_add_req(req);
2979         }
2980
2981         RETURN(0);
2982 }
2983 EXPORT_SYMBOL(osc_set_info_async);
2984
2985 int osc_reconnect(const struct lu_env *env, struct obd_export *exp,
2986                   struct obd_device *obd, struct obd_uuid *cluuid,
2987                   struct obd_connect_data *data, void *localdata)
2988 {
2989         struct client_obd *cli = &obd->u.cli;
2990
2991         if (data != NULL && (data->ocd_connect_flags & OBD_CONNECT_GRANT)) {
2992                 long lost_grant;
2993                 long grant;
2994
2995                 spin_lock(&cli->cl_loi_list_lock);
2996                 grant = cli->cl_avail_grant + cli->cl_reserved_grant;
2997                 if (data->ocd_connect_flags & OBD_CONNECT_GRANT_PARAM) {
2998                         /* restore ocd_grant_blkbits as client page bits */
2999                         data->ocd_grant_blkbits = PAGE_SHIFT;
3000                         grant += cli->cl_dirty_grant;
3001                 } else {
3002                         grant += cli->cl_dirty_pages << PAGE_SHIFT;
3003                 }
3004                 data->ocd_grant = grant ? : 2 * cli_brw_size(obd);
3005                 lost_grant = cli->cl_lost_grant;
3006                 cli->cl_lost_grant = 0;
3007                 spin_unlock(&cli->cl_loi_list_lock);
3008
3009                 CDEBUG(D_RPCTRACE, "ocd_connect_flags: %#llx ocd_version: %d"
3010                        " ocd_grant: %d, lost: %ld.\n", data->ocd_connect_flags,
3011                        data->ocd_version, data->ocd_grant, lost_grant);
3012         }
3013
3014         RETURN(0);
3015 }
3016 EXPORT_SYMBOL(osc_reconnect);
3017
3018 int osc_disconnect(struct obd_export *exp)
3019 {
3020         struct obd_device *obd = class_exp2obd(exp);
3021         int rc;
3022
3023         rc = client_disconnect_export(exp);
3024         /**
3025          * Initially we put del_shrink_grant before disconnect_export, but it
3026          * causes the following problem if setup (connect) and cleanup
3027          * (disconnect) are tangled together.
3028          *      connect p1                     disconnect p2
3029          *   ptlrpc_connect_import
3030          *     ...............               class_manual_cleanup
3031          *                                     osc_disconnect
3032          *                                     del_shrink_grant
3033          *   ptlrpc_connect_interrupt
3034          *     osc_init_grant
3035          *   add this client to shrink list
3036          *                                      cleanup_osc
3037          * Bang! grant shrink thread trigger the shrink. BUG18662
3038          */
3039         osc_del_grant_list(&obd->u.cli);
3040         return rc;
3041 }
3042 EXPORT_SYMBOL(osc_disconnect);
3043
3044 int osc_ldlm_resource_invalidate(struct cfs_hash *hs, struct cfs_hash_bd *bd,
3045                                  struct hlist_node *hnode, void *arg)
3046 {
3047         struct lu_env *env = arg;
3048         struct ldlm_resource *res = cfs_hash_object(hs, hnode);
3049         struct ldlm_lock *lock;
3050         struct osc_object *osc = NULL;
3051         ENTRY;
3052
3053         lock_res(res);
3054         list_for_each_entry(lock, &res->lr_granted, l_res_link) {
3055                 if (lock->l_ast_data != NULL && osc == NULL) {
3056                         osc = lock->l_ast_data;
3057                         cl_object_get(osc2cl(osc));
3058                 }
3059
3060                 /* clear LDLM_FL_CLEANED flag to make sure it will be canceled
3061                  * by the 2nd round of ldlm_namespace_clean() call in
3062                  * osc_import_event(). */
3063                 ldlm_clear_cleaned(lock);
3064         }
3065         unlock_res(res);
3066
3067         if (osc != NULL) {
3068                 osc_object_invalidate(env, osc);
3069                 cl_object_put(env, osc2cl(osc));
3070         }
3071
3072         RETURN(0);
3073 }
3074 EXPORT_SYMBOL(osc_ldlm_resource_invalidate);
3075
3076 static int osc_import_event(struct obd_device *obd,
3077                             struct obd_import *imp,
3078                             enum obd_import_event event)
3079 {
3080         struct client_obd *cli;
3081         int rc = 0;
3082
3083         ENTRY;
3084         LASSERT(imp->imp_obd == obd);
3085
3086         switch (event) {
3087         case IMP_EVENT_DISCON: {
3088                 cli = &obd->u.cli;
3089                 spin_lock(&cli->cl_loi_list_lock);
3090                 cli->cl_avail_grant = 0;
3091                 cli->cl_lost_grant = 0;
3092                 spin_unlock(&cli->cl_loi_list_lock);
3093                 break;
3094         }
3095         case IMP_EVENT_INACTIVE: {
3096                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_INACTIVE);
3097                 break;
3098         }
3099         case IMP_EVENT_INVALIDATE: {
3100                 struct ldlm_namespace *ns = obd->obd_namespace;
3101                 struct lu_env         *env;
3102                 __u16                  refcheck;
3103
3104                 ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
3105
3106                 env = cl_env_get(&refcheck);
3107                 if (!IS_ERR(env)) {
3108                         osc_io_unplug(env, &obd->u.cli, NULL);
3109
3110                         cfs_hash_for_each_nolock(ns->ns_rs_hash,
3111                                                  osc_ldlm_resource_invalidate,
3112                                                  env, 0);
3113                         cl_env_put(env, &refcheck);
3114
3115                         ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
3116                 } else
3117                         rc = PTR_ERR(env);
3118                 break;
3119         }
3120         case IMP_EVENT_ACTIVE: {
3121                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_ACTIVE);
3122                 break;
3123         }
3124         case IMP_EVENT_OCD: {
3125                 struct obd_connect_data *ocd = &imp->imp_connect_data;
3126
3127                 if (ocd->ocd_connect_flags & OBD_CONNECT_GRANT)
3128                         osc_init_grant(&obd->u.cli, ocd);
3129
3130                 /* See bug 7198 */
3131                 if (ocd->ocd_connect_flags & OBD_CONNECT_REQPORTAL)
3132                         imp->imp_client->cli_request_portal =OST_REQUEST_PORTAL;
3133
3134                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_OCD);
3135                 break;
3136         }
3137         case IMP_EVENT_DEACTIVATE: {
3138                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_DEACTIVATE);
3139                 break;
3140         }
3141         case IMP_EVENT_ACTIVATE: {
3142                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_ACTIVATE);
3143                 break;
3144         }
3145         default:
3146                 CERROR("Unknown import event %d\n", event);
3147                 LBUG();
3148         }
3149         RETURN(rc);
3150 }
3151
3152 /**
3153  * Determine whether the lock can be canceled before replaying the lock
3154  * during recovery, see bug16774 for detailed information.
3155  *
3156  * \retval zero the lock can't be canceled
3157  * \retval other ok to cancel
3158  */
3159 static int osc_cancel_weight(struct ldlm_lock *lock)
3160 {
3161         /*
3162          * Cancel all unused and granted extent lock.
3163          */
3164         if (lock->l_resource->lr_type == LDLM_EXTENT &&
3165             ldlm_is_granted(lock) &&
3166             osc_ldlm_weigh_ast(lock) == 0)
3167                 RETURN(1);
3168
3169         RETURN(0);
3170 }
3171
3172 static int brw_queue_work(const struct lu_env *env, void *data)
3173 {
3174         struct client_obd *cli = data;
3175
3176         CDEBUG(D_CACHE, "Run writeback work for client obd %p.\n", cli);
3177
3178         osc_io_unplug(env, cli, NULL);
3179         RETURN(0);
3180 }
3181
3182 int osc_setup_common(struct obd_device *obd, struct lustre_cfg *lcfg)
3183 {
3184         struct client_obd *cli = &obd->u.cli;
3185         void *handler;
3186         int rc;
3187
3188         ENTRY;
3189
3190         rc = ptlrpcd_addref();
3191         if (rc)
3192                 RETURN(rc);
3193
3194         rc = client_obd_setup(obd, lcfg);
3195         if (rc)
3196                 GOTO(out_ptlrpcd, rc);
3197
3198
3199         handler = ptlrpcd_alloc_work(cli->cl_import, brw_queue_work, cli);
3200         if (IS_ERR(handler))
3201                 GOTO(out_ptlrpcd_work, rc = PTR_ERR(handler));
3202         cli->cl_writeback_work = handler;
3203
3204         handler = ptlrpcd_alloc_work(cli->cl_import, lru_queue_work, cli);
3205         if (IS_ERR(handler))
3206                 GOTO(out_ptlrpcd_work, rc = PTR_ERR(handler));
3207         cli->cl_lru_work = handler;
3208
3209         rc = osc_quota_setup(obd);
3210         if (rc)
3211                 GOTO(out_ptlrpcd_work, rc);
3212
3213         cli->cl_grant_shrink_interval = GRANT_SHRINK_INTERVAL;
3214         osc_update_next_shrink(cli);
3215
3216         RETURN(rc);
3217
3218 out_ptlrpcd_work:
3219         if (cli->cl_writeback_work != NULL) {
3220                 ptlrpcd_destroy_work(cli->cl_writeback_work);
3221                 cli->cl_writeback_work = NULL;
3222         }
3223         if (cli->cl_lru_work != NULL) {
3224                 ptlrpcd_destroy_work(cli->cl_lru_work);
3225                 cli->cl_lru_work = NULL;
3226         }
3227         client_obd_cleanup(obd);
3228 out_ptlrpcd:
3229         ptlrpcd_decref();
3230         RETURN(rc);
3231 }
3232 EXPORT_SYMBOL(osc_setup_common);
3233
3234 int osc_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
3235 {
3236         struct client_obd *cli = &obd->u.cli;
3237         int                adding;
3238         int                added;
3239         int                req_count;
3240         int                rc;
3241
3242         ENTRY;
3243
3244         rc = osc_setup_common(obd, lcfg);
3245         if (rc < 0)
3246                 RETURN(rc);
3247
3248         rc = osc_tunables_init(obd);
3249         if (rc)
3250                 RETURN(rc);
3251
3252         /*
3253          * We try to control the total number of requests with a upper limit
3254          * osc_reqpool_maxreqcount. There might be some race which will cause
3255          * over-limit allocation, but it is fine.
3256          */
3257         req_count = atomic_read(&osc_pool_req_count);
3258         if (req_count < osc_reqpool_maxreqcount) {
3259                 adding = cli->cl_max_rpcs_in_flight + 2;
3260                 if (req_count + adding > osc_reqpool_maxreqcount)
3261                         adding = osc_reqpool_maxreqcount - req_count;
3262
3263                 added = ptlrpc_add_rqs_to_pool(osc_rq_pool, adding);
3264                 atomic_add(added, &osc_pool_req_count);
3265         }
3266
3267         ns_register_cancel(obd->obd_namespace, osc_cancel_weight);
3268
3269         spin_lock(&osc_shrink_lock);
3270         list_add_tail(&cli->cl_shrink_list, &osc_shrink_list);
3271         spin_unlock(&osc_shrink_lock);
3272         cli->cl_import->imp_idle_timeout = osc_idle_timeout;
3273         cli->cl_import->imp_idle_debug = D_HA;
3274
3275         RETURN(0);
3276 }
3277
3278 int osc_precleanup_common(struct obd_device *obd)
3279 {
3280         struct client_obd *cli = &obd->u.cli;
3281         ENTRY;
3282
3283         /* LU-464
3284          * for echo client, export may be on zombie list, wait for
3285          * zombie thread to cull it, because cli.cl_import will be
3286          * cleared in client_disconnect_export():
3287          *   class_export_destroy() -> obd_cleanup() ->
3288          *   echo_device_free() -> echo_client_cleanup() ->
3289          *   obd_disconnect() -> osc_disconnect() ->
3290          *   client_disconnect_export()
3291          */
3292         obd_zombie_barrier();
3293         if (cli->cl_writeback_work) {
3294                 ptlrpcd_destroy_work(cli->cl_writeback_work);
3295                 cli->cl_writeback_work = NULL;
3296         }
3297
3298         if (cli->cl_lru_work) {
3299                 ptlrpcd_destroy_work(cli->cl_lru_work);
3300                 cli->cl_lru_work = NULL;
3301         }
3302
3303         obd_cleanup_client_import(obd);
3304         RETURN(0);
3305 }
3306 EXPORT_SYMBOL(osc_precleanup_common);
3307
3308 static int osc_precleanup(struct obd_device *obd)
3309 {
3310         ENTRY;
3311
3312         osc_precleanup_common(obd);
3313
3314         ptlrpc_lprocfs_unregister_obd(obd);
3315         RETURN(0);
3316 }
3317
3318 int osc_cleanup_common(struct obd_device *obd)
3319 {
3320         struct client_obd *cli = &obd->u.cli;
3321         int rc;
3322
3323         ENTRY;
3324
3325         spin_lock(&osc_shrink_lock);
3326         list_del(&cli->cl_shrink_list);
3327         spin_unlock(&osc_shrink_lock);
3328
3329         /* lru cleanup */
3330         if (cli->cl_cache != NULL) {
3331                 LASSERT(atomic_read(&cli->cl_cache->ccc_users) > 0);
3332                 spin_lock(&cli->cl_cache->ccc_lru_lock);
3333                 list_del_init(&cli->cl_lru_osc);
3334                 spin_unlock(&cli->cl_cache->ccc_lru_lock);
3335                 cli->cl_lru_left = NULL;
3336                 cl_cache_decref(cli->cl_cache);
3337                 cli->cl_cache = NULL;
3338         }
3339
3340         /* free memory of osc quota cache */
3341         osc_quota_cleanup(obd);
3342
3343         rc = client_obd_cleanup(obd);
3344
3345         ptlrpcd_decref();
3346         RETURN(rc);
3347 }
3348 EXPORT_SYMBOL(osc_cleanup_common);
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_quotactl             = osc_quotactl,
3370 };
3371
3372 static struct shrinker *osc_cache_shrinker;
3373 struct list_head osc_shrink_list = LIST_HEAD_INIT(osc_shrink_list);
3374 DEFINE_SPINLOCK(osc_shrink_lock);
3375
3376 #ifndef HAVE_SHRINKER_COUNT
3377 static int osc_cache_shrink(SHRINKER_ARGS(sc, nr_to_scan, gfp_mask))
3378 {
3379         struct shrink_control scv = {
3380                 .nr_to_scan = shrink_param(sc, nr_to_scan),
3381                 .gfp_mask   = shrink_param(sc, gfp_mask)
3382         };
3383 #if !defined(HAVE_SHRINKER_WANT_SHRINK_PTR) && !defined(HAVE_SHRINK_CONTROL)
3384         struct shrinker *shrinker = NULL;
3385 #endif
3386
3387         (void)osc_cache_shrink_scan(shrinker, &scv);
3388
3389         return osc_cache_shrink_count(shrinker, &scv);
3390 }
3391 #endif
3392
3393 static int __init osc_init(void)
3394 {
3395         unsigned int reqpool_size;
3396         unsigned int reqsize;
3397         int rc;
3398         DEF_SHRINKER_VAR(osc_shvar, osc_cache_shrink,
3399                          osc_cache_shrink_count, osc_cache_shrink_scan);
3400         ENTRY;
3401
3402         /* print an address of _any_ initialized kernel symbol from this
3403          * module, to allow debugging with gdb that doesn't support data
3404          * symbols from modules.*/
3405         CDEBUG(D_INFO, "Lustre OSC module (%p).\n", &osc_caches);
3406
3407         rc = lu_kmem_init(osc_caches);
3408         if (rc)
3409                 RETURN(rc);
3410
3411         rc = class_register_type(&osc_obd_ops, NULL, true, NULL,
3412                                  LUSTRE_OSC_NAME, &osc_device_type);
3413         if (rc)
3414                 GOTO(out_kmem, rc);
3415
3416         osc_cache_shrinker = set_shrinker(DEFAULT_SEEKS, &osc_shvar);
3417
3418         /* This is obviously too much memory, only prevent overflow here */
3419         if (osc_reqpool_mem_max >= 1 << 12 || osc_reqpool_mem_max == 0)
3420                 GOTO(out_type, rc = -EINVAL);
3421
3422         reqpool_size = osc_reqpool_mem_max << 20;
3423
3424         reqsize = 1;
3425         while (reqsize < OST_IO_MAXREQSIZE)
3426                 reqsize = reqsize << 1;
3427
3428         /*
3429          * We don't enlarge the request count in OSC pool according to
3430          * cl_max_rpcs_in_flight. The allocation from the pool will only be
3431          * tried after normal allocation failed. So a small OSC pool won't
3432          * cause much performance degression in most of cases.
3433          */
3434         osc_reqpool_maxreqcount = reqpool_size / reqsize;
3435
3436         atomic_set(&osc_pool_req_count, 0);
3437         osc_rq_pool = ptlrpc_init_rq_pool(0, OST_IO_MAXREQSIZE,
3438                                           ptlrpc_add_rqs_to_pool);
3439
3440         if (osc_rq_pool == NULL)
3441                 GOTO(out_type, rc = -ENOMEM);
3442
3443         rc = osc_start_grant_work();
3444         if (rc != 0)
3445                 GOTO(out_req_pool, rc);
3446
3447         RETURN(rc);
3448
3449 out_req_pool:
3450         ptlrpc_free_rq_pool(osc_rq_pool);
3451 out_type:
3452         class_unregister_type(LUSTRE_OSC_NAME);
3453 out_kmem:
3454         lu_kmem_fini(osc_caches);
3455
3456         RETURN(rc);
3457 }
3458
3459 static void __exit osc_exit(void)
3460 {
3461         osc_stop_grant_work();
3462         remove_shrinker(osc_cache_shrinker);
3463         class_unregister_type(LUSTRE_OSC_NAME);
3464         lu_kmem_fini(osc_caches);
3465         ptlrpc_free_rq_pool(osc_rq_pool);
3466 }
3467
3468 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
3469 MODULE_DESCRIPTION("Lustre Object Storage Client (OSC)");
3470 MODULE_VERSION(LUSTRE_VERSION_STRING);
3471 MODULE_LICENSE("GPL");
3472
3473 module_init(osc_init);
3474 module_exit(osc_exit);