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