lustre/osc/osc_request.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  */
  32
  33 #define DEBUG_SUBSYSTEM S_OSC
  34
  35 #include <linux/workqueue.h>
  36 #include <libcfs/libcfs.h>
  37 #include <linux/falloc.h>
  38 #include <lprocfs_status.h>
  39 #include <lustre_debug.h>
  40 #include <lustre_dlm.h>
  41 #include <lustre_fid.h>
  42 #include <lustre_ha.h>
  43 #include <uapi/linux/lustre/lustre_ioctl.h>
  44 #include <lustre_net.h>
  45 #include <lustre_obdo.h>
  46 #include <obd.h>
  47 #include <obd_cksum.h>
  48 #include <obd_class.h>
  49 #include <lustre_osc.h>
  50 #include <linux/falloc.h>
  51
  52 #include "osc_internal.h"
  53
  54 atomic_t osc_pool_req_count;
  55 unsigned int osc_reqpool_maxreqcount;
  56 struct ptlrpc_request_pool *osc_rq_pool;
  57
  58 /* max memory used for request pool, unit is MB */
  59 static unsigned int osc_reqpool_mem_max = 5;
  60 module_param(osc_reqpool_mem_max, uint, 0444);
  61
  62 static int osc_idle_timeout = 20;
  63 module_param(osc_idle_timeout, uint, 0644);
  64
  65 #define osc_grant_args osc_brw_async_args
  66
  67 struct osc_setattr_args {
  68         struct obdo             *sa_oa;
  69         obd_enqueue_update_f     sa_upcall;
  70         void                    *sa_cookie;
  71 };
  72
  73 struct osc_fsync_args {
  74         struct osc_object       *fa_obj;
  75         struct obdo             *fa_oa;
  76         obd_enqueue_update_f    fa_upcall;
  77         void                    *fa_cookie;
  78 };
  79
  80 struct osc_ladvise_args {
  81         struct obdo             *la_oa;
  82         obd_enqueue_update_f     la_upcall;
  83         void                    *la_cookie;
  84 };
  85
  86 static void osc_release_ppga(struct brw_page **ppga, size_t count);
  87 static int brw_interpret(const struct lu_env *env, struct ptlrpc_request *req,
  88                          void *data, int rc);
  89
  90 void osc_pack_req_body(struct ptlrpc_request *req, struct obdo *oa)
  91 {
  92         struct ost_body *body;
  93
  94         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
  95         LASSERT(body);
  96
  97         lustre_set_wire_obdo(&req->rq_import->imp_connect_data, &body->oa, oa);
  98 }
  99
 100 static int osc_getattr(const struct lu_env *env, struct obd_export *exp,
 101                        struct obdo *oa)
 102 {
 103         struct ptlrpc_request   *req;
 104         struct ost_body         *body;
 105         int                      rc;
 106
 107         ENTRY;
 108         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_GETATTR);
 109         if (req == NULL)
 110                 RETURN(-ENOMEM);
 111
 112         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GETATTR);
 113         if (rc) {
 114                 ptlrpc_request_free(req);
 115                 RETURN(rc);
 116         }
 117
 118         osc_pack_req_body(req, oa);
 119
 120         ptlrpc_request_set_replen(req);
 121
 122         rc = ptlrpc_queue_wait(req);
 123         if (rc)
 124                 GOTO(out, rc);
 125
 126         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 127         if (body == NULL)
 128                 GOTO(out, rc = -EPROTO);
 129
 130         CDEBUG(D_INODE, "mode: %o\n", body->oa.o_mode);
 131         lustre_get_wire_obdo(&req->rq_import->imp_connect_data, oa, &body->oa);
 132
 133         oa->o_blksize = cli_brw_size(exp->exp_obd);
 134         oa->o_valid |= OBD_MD_FLBLKSZ;
 135
 136         EXIT;
 137 out:
 138         ptlrpc_req_finished(req);
 139
 140         return rc;
 141 }
 142
 143 static int osc_setattr(const struct lu_env *env, struct obd_export *exp,
 144                        struct obdo *oa)
 145 {
 146         struct ptlrpc_request   *req;
 147         struct ost_body         *body;
 148         int                      rc;
 149
 150         ENTRY;
 151         LASSERT(oa->o_valid & OBD_MD_FLGROUP);
 152
 153         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_SETATTR);
 154         if (req == NULL)
 155                 RETURN(-ENOMEM);
 156
 157         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SETATTR);
 158         if (rc) {
 159                 ptlrpc_request_free(req);
 160                 RETURN(rc);
 161         }
 162
 163         osc_pack_req_body(req, oa);
 164
 165         ptlrpc_request_set_replen(req);
 166
 167         rc = ptlrpc_queue_wait(req);
 168         if (rc)
 169                 GOTO(out, rc);
 170
 171         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 172         if (body == NULL)
 173                 GOTO(out, rc = -EPROTO);
 174
 175         lustre_get_wire_obdo(&req->rq_import->imp_connect_data, oa, &body->oa);
 176
 177         EXIT;
 178 out:
 179         ptlrpc_req_finished(req);
 180
 181         RETURN(rc);
 182 }
 183
 184 static int osc_setattr_interpret(const struct lu_env *env,
 185                                  struct ptlrpc_request *req, void *args, int rc)
 186 {
 187         struct osc_setattr_args *sa = args;
 188         struct ost_body *body;
 189
 190         ENTRY;
 191
 192         if (rc != 0)
 193                 GOTO(out, rc);
 194
 195         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 196         if (body == NULL)
 197                 GOTO(out, rc = -EPROTO);
 198
 199         lustre_get_wire_obdo(&req->rq_import->imp_connect_data, sa->sa_oa,
 200                              &body->oa);
 201 out:
 202         rc = sa->sa_upcall(sa->sa_cookie, rc);
 203         RETURN(rc);
 204 }
 205
 206 int osc_setattr_async(struct obd_export *exp, struct obdo *oa,
 207                       obd_enqueue_update_f upcall, void *cookie,
 208                       struct ptlrpc_request_set *rqset)
 209 {
 210         struct ptlrpc_request   *req;
 211         struct osc_setattr_args *sa;
 212         int                      rc;
 213
 214         ENTRY;
 215
 216         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_SETATTR);
 217         if (req == NULL)
 218                 RETURN(-ENOMEM);
 219
 220         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SETATTR);
 221         if (rc) {
 222                 ptlrpc_request_free(req);
 223                 RETURN(rc);
 224         }
 225
 226         osc_pack_req_body(req, oa);
 227
 228         ptlrpc_request_set_replen(req);
 229
 230         /* do mds to ost setattr asynchronously */
 231         if (!rqset) {
 232                 /* Do not wait for response. */
 233                 ptlrpcd_add_req(req);
 234         } else {
 235                 req->rq_interpret_reply = osc_setattr_interpret;
 236
 237                 sa = ptlrpc_req_async_args(sa, req);
 238                 sa->sa_oa = oa;
 239                 sa->sa_upcall = upcall;
 240                 sa->sa_cookie = cookie;
 241
 242                 ptlrpc_set_add_req(rqset, req);
 243         }
 244
 245         RETURN(0);
 246 }
 247
 248 static int osc_ladvise_interpret(const struct lu_env *env,
 249                                  struct ptlrpc_request *req,
 250                                  void *arg, int rc)
 251 {
 252         struct osc_ladvise_args *la = arg;
 253         struct ost_body *body;
 254         ENTRY;
 255
 256         if (rc != 0)
 257                 GOTO(out, rc);
 258
 259         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 260         if (body == NULL)
 261                 GOTO(out, rc = -EPROTO);
 262
 263         *la->la_oa = body->oa;
 264 out:
 265         rc = la->la_upcall(la->la_cookie, rc);
 266         RETURN(rc);
 267 }
 268
 269 /**
 270  * If rqset is NULL, do not wait for response. Upcall and cookie could also
 271  * be NULL in this case
 272  */
 273 int osc_ladvise_base(struct obd_export *exp, struct obdo *oa,
 274                      struct ladvise_hdr *ladvise_hdr,
 275                      obd_enqueue_update_f upcall, void *cookie,
 276                      struct ptlrpc_request_set *rqset)
 277 {
 278         struct ptlrpc_request   *req;
 279         struct ost_body         *body;
 280         struct osc_ladvise_args *la;
 281         int                      rc;
 282         struct lu_ladvise       *req_ladvise;
 283         struct lu_ladvise       *ladvise = ladvise_hdr->lah_advise;
 284         int                      num_advise = ladvise_hdr->lah_count;
 285         struct ladvise_hdr      *req_ladvise_hdr;
 286         ENTRY;
 287
 288         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_LADVISE);
 289         if (req == NULL)
 290                 RETURN(-ENOMEM);
 291
 292         req_capsule_set_size(&req->rq_pill, &RMF_OST_LADVISE, RCL_CLIENT,
 293                              num_advise * sizeof(*ladvise));
 294         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_LADVISE);
 295         if (rc != 0) {
 296                 ptlrpc_request_free(req);
 297                 RETURN(rc);
 298         }
 299         req->rq_request_portal = OST_IO_PORTAL;
 300         ptlrpc_at_set_req_timeout(req);
 301
 302         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 303         LASSERT(body);
 304         lustre_set_wire_obdo(&req->rq_import->imp_connect_data, &body->oa,
 305                              oa);
 306
 307         req_ladvise_hdr = req_capsule_client_get(&req->rq_pill,
 308                                                  &RMF_OST_LADVISE_HDR);
 309         memcpy(req_ladvise_hdr, ladvise_hdr, sizeof(*ladvise_hdr));
 310
 311         req_ladvise = req_capsule_client_get(&req->rq_pill, &RMF_OST_LADVISE);
 312         memcpy(req_ladvise, ladvise, sizeof(*ladvise) * num_advise);
 313         ptlrpc_request_set_replen(req);
 314
 315         if (rqset == NULL) {
 316                 /* Do not wait for response. */
 317                 ptlrpcd_add_req(req);
 318                 RETURN(0);
 319         }
 320
 321         req->rq_interpret_reply = osc_ladvise_interpret;
 322         la = ptlrpc_req_async_args(la, req);
 323         la->la_oa = oa;
 324         la->la_upcall = upcall;
 325         la->la_cookie = cookie;
 326
 327         ptlrpc_set_add_req(rqset, req);
 328
 329         RETURN(0);
 330 }
 331
 332 static int osc_create(const struct lu_env *env, struct obd_export *exp,
 333                       struct obdo *oa)
 334 {
 335         struct ptlrpc_request *req;
 336         struct ost_body       *body;
 337         int                    rc;
 338         ENTRY;
 339
 340         LASSERT(oa != NULL);
 341         LASSERT(oa->o_valid & OBD_MD_FLGROUP);
 342         LASSERT(fid_seq_is_echo(ostid_seq(&oa->o_oi)));
 343
 344         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_CREATE);
 345         if (req == NULL)
 346                 GOTO(out, rc = -ENOMEM);
 347
 348         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_CREATE);
 349         if (rc) {
 350                 ptlrpc_request_free(req);
 351                 GOTO(out, rc);
 352         }
 353
 354         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 355         LASSERT(body);
 356
 357         lustre_set_wire_obdo(&req->rq_import->imp_connect_data, &body->oa, oa);
 358
 359         ptlrpc_request_set_replen(req);
 360
 361         rc = ptlrpc_queue_wait(req);
 362         if (rc)
 363                 GOTO(out_req, rc);
 364
 365         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 366         if (body == NULL)
 367                 GOTO(out_req, rc = -EPROTO);
 368
 369         CDEBUG(D_INFO, "oa flags %x\n", oa->o_flags);
 370         lustre_get_wire_obdo(&req->rq_import->imp_connect_data, oa, &body->oa);
 371
 372         oa->o_blksize = cli_brw_size(exp->exp_obd);
 373         oa->o_valid |= OBD_MD_FLBLKSZ;
 374
 375         CDEBUG(D_HA, "transno: %lld\n",
 376                lustre_msg_get_transno(req->rq_repmsg));
 377 out_req:
 378         ptlrpc_req_finished(req);
 379 out:
 380         RETURN(rc);
 381 }
 382
 383 int osc_punch_send(struct obd_export *exp, struct obdo *oa,
 384                    obd_enqueue_update_f upcall, void *cookie)
 385 {
 386         struct ptlrpc_request *req;
 387         struct osc_setattr_args *sa;
 388         struct obd_import *imp = class_exp2cliimp(exp);
 389         struct ost_body *body;
 390         int rc;
 391
 392         ENTRY;
 393
 394         req = ptlrpc_request_alloc(imp, &RQF_OST_PUNCH);
 395         if (req == NULL)
 396                 RETURN(-ENOMEM);
 397
 398         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_PUNCH);
 399         if (rc < 0) {
 400                 ptlrpc_request_free(req);
 401                 RETURN(rc);
 402         }
 403
 404         osc_set_io_portal(req);
 405
 406         ptlrpc_at_set_req_timeout(req);
 407
 408         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 409
 410         lustre_set_wire_obdo(&imp->imp_connect_data, &body->oa, oa);
 411
 412         ptlrpc_request_set_replen(req);
 413
 414         req->rq_interpret_reply = osc_setattr_interpret;
 415         sa = ptlrpc_req_async_args(sa, req);
 416         sa->sa_oa = oa;
 417         sa->sa_upcall = upcall;
 418         sa->sa_cookie = cookie;
 419
 420         ptlrpcd_add_req(req);
 421
 422         RETURN(0);
 423 }
 424 EXPORT_SYMBOL(osc_punch_send);
 425
 426 /**
 427  * osc_fallocate_base() - Handles fallocate request.
 428  *
 429  * @exp:        Export structure
 430  * @oa:         Attributes passed to OSS from client (obdo structure)
 431  * @upcall:     Primary & supplementary group information
 432  * @cookie:     Exclusive identifier
 433  * @rqset:      Request list.
 434  * @mode:       Operation done on given range.
 435  *
 436  * osc_fallocate_base() - Handles fallocate requests only. Only block
 437  * allocation or standard preallocate operation is supported currently.
 438  * Other mode flags is not supported yet. ftruncate(2) or truncate(2)
 439  * is supported via SETATTR request.
 440  *
 441  * Return: Non-zero on failure and O on success.
 442  */
 443 int osc_fallocate_base(struct obd_export *exp, struct obdo *oa,
 444                        obd_enqueue_update_f upcall, void *cookie, int mode)
 445 {
 446         struct ptlrpc_request *req;
 447         struct osc_setattr_args *sa;
 448         struct ost_body *body;
 449         struct obd_import *imp = class_exp2cliimp(exp);
 450         int rc;
 451         ENTRY;
 452
 453         /*
 454          * Only mode == 0 (which is standard prealloc) is supported now.
 455          * Punch is not supported yet.
 456          */
 457         if (mode & ~FALLOC_FL_KEEP_SIZE)
 458                 RETURN(-EOPNOTSUPP);
 459         oa->o_falloc_mode = mode;
 460
 461         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
 462                                    &RQF_OST_FALLOCATE);
 463         if (req == NULL)
 464                 RETURN(-ENOMEM);
 465
 466         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_FALLOCATE);
 467         if (rc != 0) {
 468                 ptlrpc_request_free(req);
 469                 RETURN(rc);
 470         }
 471
 472         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 473         LASSERT(body);
 474
 475         lustre_set_wire_obdo(&imp->imp_connect_data, &body->oa, oa);
 476
 477         ptlrpc_request_set_replen(req);
 478
 479         req->rq_interpret_reply = (ptlrpc_interpterer_t)osc_setattr_interpret;
 480         BUILD_BUG_ON(sizeof(*sa) > sizeof(req->rq_async_args));
 481         sa = ptlrpc_req_async_args(sa, req);
 482         sa->sa_oa = oa;
 483         sa->sa_upcall = upcall;
 484         sa->sa_cookie = cookie;
 485
 486         ptlrpcd_add_req(req);
 487
 488         RETURN(0);
 489 }
 490
 491 static int osc_sync_interpret(const struct lu_env *env,
 492                               struct ptlrpc_request *req, void *args, int rc)
 493 {
 494         struct osc_fsync_args *fa = args;
 495         struct ost_body *body;
 496         struct cl_attr *attr = &osc_env_info(env)->oti_attr;
 497         unsigned long valid = 0;
 498         struct cl_object *obj;
 499         ENTRY;
 500
 501         if (rc != 0)
 502                 GOTO(out, rc);
 503
 504         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 505         if (body == NULL) {
 506                 CERROR("can't unpack ost_body\n");
 507                 GOTO(out, rc = -EPROTO);
 508         }
 509
 510         *fa->fa_oa = body->oa;
 511         obj = osc2cl(fa->fa_obj);
 512
 513         /* Update osc object's blocks attribute */
 514         cl_object_attr_lock(obj);
 515         if (body->oa.o_valid & OBD_MD_FLBLOCKS) {
 516                 attr->cat_blocks = body->oa.o_blocks;
 517                 valid |= CAT_BLOCKS;
 518         }
 519
 520         if (valid != 0)
 521                 cl_object_attr_update(env, obj, attr, valid);
 522         cl_object_attr_unlock(obj);
 523
 524 out:
 525         rc = fa->fa_upcall(fa->fa_cookie, rc);
 526         RETURN(rc);
 527 }
 528
 529 int osc_sync_base(struct osc_object *obj, struct obdo *oa,
 530                   obd_enqueue_update_f upcall, void *cookie,
 531                   struct ptlrpc_request_set *rqset)
 532 {
 533         struct obd_export     *exp = osc_export(obj);
 534         struct ptlrpc_request *req;
 535         struct ost_body       *body;
 536         struct osc_fsync_args *fa;
 537         int                    rc;
 538         ENTRY;
 539
 540         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_SYNC);
 541         if (req == NULL)
 542                 RETURN(-ENOMEM);
 543
 544         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SYNC);
 545         if (rc) {
 546                 ptlrpc_request_free(req);
 547                 RETURN(rc);
 548         }
 549
 550         /* overload the size and blocks fields in the oa with start/end */
 551         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 552         LASSERT(body);
 553         lustre_set_wire_obdo(&req->rq_import->imp_connect_data, &body->oa, oa);
 554
 555         ptlrpc_request_set_replen(req);
 556         req->rq_interpret_reply = osc_sync_interpret;
 557
 558         fa = ptlrpc_req_async_args(fa, req);
 559         fa->fa_obj = obj;
 560         fa->fa_oa = oa;
 561         fa->fa_upcall = upcall;
 562         fa->fa_cookie = cookie;
 563
 564         ptlrpc_set_add_req(rqset, req);
 565
 566         RETURN (0);
 567 }
 568
 569 /* Find and cancel locally locks matched by @mode in the resource found by
 570  * @objid. Found locks are added into @cancel list. Returns the amount of
 571  * locks added to @cancels list. */
 572 static int osc_resource_get_unused(struct obd_export *exp, struct obdo *oa,
 573                                    struct list_head *cancels,
 574                                    enum ldlm_mode mode, __u64 lock_flags)
 575 {
 576         struct ldlm_namespace *ns = exp->exp_obd->obd_namespace;
 577         struct ldlm_res_id res_id;
 578         struct ldlm_resource *res;
 579         int count;
 580         ENTRY;
 581
 582         /* Return, i.e. cancel nothing, only if ELC is supported (flag in
 583          * export) but disabled through procfs (flag in NS).
 584          *
 585          * This distinguishes from a case when ELC is not supported originally,
 586          * when we still want to cancel locks in advance and just cancel them
 587          * locally, without sending any RPC. */
 588         if (exp_connect_cancelset(exp) && !ns_connect_cancelset(ns))
 589                 RETURN(0);
 590
 591         ostid_build_res_name(&oa->o_oi, &res_id);
 592         res = ldlm_resource_get(ns, NULL, &res_id, 0, 0);
 593         if (IS_ERR(res))
 594                 RETURN(0);
 595
 596         LDLM_RESOURCE_ADDREF(res);
 597         count = ldlm_cancel_resource_local(res, cancels, NULL, mode,
 598                                            lock_flags, 0, NULL);
 599         LDLM_RESOURCE_DELREF(res);
 600         ldlm_resource_putref(res);
 601         RETURN(count);
 602 }
 603
 604 static int osc_destroy_interpret(const struct lu_env *env,
 605                                  struct ptlrpc_request *req, void *args, int rc)
 606 {
 607         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
 608
 609         atomic_dec(&cli->cl_destroy_in_flight);
 610         wake_up(&cli->cl_destroy_waitq);
 611
 612         return 0;
 613 }
 614
 615 static int osc_can_send_destroy(struct client_obd *cli)
 616 {
 617         if (atomic_inc_return(&cli->cl_destroy_in_flight) <=
 618             cli->cl_max_rpcs_in_flight) {
 619                 /* The destroy request can be sent */
 620                 return 1;
 621         }
 622         if (atomic_dec_return(&cli->cl_destroy_in_flight) <
 623             cli->cl_max_rpcs_in_flight) {
 624                 /*
 625                  * The counter has been modified between the two atomic
 626                  * operations.
 627                  */
 628                 wake_up(&cli->cl_destroy_waitq);
 629         }
 630         return 0;
 631 }
 632
 633 static int osc_destroy(const struct lu_env *env, struct obd_export *exp,
 634                        struct obdo *oa)
 635 {
 636         struct client_obd     *cli = &exp->exp_obd->u.cli;
 637         struct ptlrpc_request *req;
 638         struct ost_body       *body;
 639         LIST_HEAD(cancels);
 640         int rc, count;
 641         ENTRY;
 642
 643         if (!oa) {
 644                 CDEBUG(D_INFO, "oa NULL\n");
 645                 RETURN(-EINVAL);
 646         }
 647
 648         count = osc_resource_get_unused(exp, oa, &cancels, LCK_PW,
 649                                         LDLM_FL_DISCARD_DATA);
 650
 651         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_DESTROY);
 652         if (req == NULL) {
 653                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
 654                 RETURN(-ENOMEM);
 655         }
 656
 657         rc = ldlm_prep_elc_req(exp, req, LUSTRE_OST_VERSION, OST_DESTROY,
 658                                0, &cancels, count);
 659         if (rc) {
 660                 ptlrpc_request_free(req);
 661                 RETURN(rc);
 662         }
 663
 664         req->rq_request_portal = OST_IO_PORTAL; /* bug 7198 */
 665         ptlrpc_at_set_req_timeout(req);
 666
 667         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 668         LASSERT(body);
 669         lustre_set_wire_obdo(&req->rq_import->imp_connect_data, &body->oa, oa);
 670
 671         ptlrpc_request_set_replen(req);
 672
 673         req->rq_interpret_reply = osc_destroy_interpret;
 674         if (!osc_can_send_destroy(cli)) {
 675                 /*
 676                  * Wait until the number of on-going destroy RPCs drops
 677                  * under max_rpc_in_flight
 678                  */
 679                 rc = l_wait_event_abortable_exclusive(
 680                         cli->cl_destroy_waitq,
 681                         osc_can_send_destroy(cli));
 682                 if (rc) {
 683                         ptlrpc_req_finished(req);
 684                         RETURN(-EINTR);
 685                 }
 686         }
 687
 688         /* Do not wait for response */
 689         ptlrpcd_add_req(req);
 690         RETURN(0);
 691 }
 692
 693 static void osc_announce_cached(struct client_obd *cli, struct obdo *oa,
 694                                 long writing_bytes)
 695 {
 696         u64 bits = OBD_MD_FLBLOCKS | OBD_MD_FLGRANT;
 697
 698         LASSERT(!(oa->o_valid & bits));
 699
 700         oa->o_valid |= bits;
 701         spin_lock(&cli->cl_loi_list_lock);
 702         if (OCD_HAS_FLAG(&cli->cl_import->imp_connect_data, GRANT_PARAM))
 703                 oa->o_dirty = cli->cl_dirty_grant;
 704         else
 705                 oa->o_dirty = cli->cl_dirty_pages << PAGE_SHIFT;
 706         if (unlikely(cli->cl_dirty_pages > cli->cl_dirty_max_pages)) {
 707                 CERROR("dirty %lu > dirty_max %lu\n",
 708                        cli->cl_dirty_pages,
 709                        cli->cl_dirty_max_pages);
 710                 oa->o_undirty = 0;
 711         } else if (unlikely(atomic_long_read(&obd_dirty_pages) >
 712                             (long)(obd_max_dirty_pages + 1))) {
 713                 /* The atomic_read() allowing the atomic_inc() are
 714                  * not covered by a lock thus they may safely race and trip
 715                  * this CERROR() unless we add in a small fudge factor (+1). */
 716                 CERROR("%s: dirty %ld > system dirty_max %ld\n",
 717                        cli_name(cli), atomic_long_read(&obd_dirty_pages),
 718                        obd_max_dirty_pages);
 719                 oa->o_undirty = 0;
 720         } else if (unlikely(cli->cl_dirty_max_pages - cli->cl_dirty_pages >
 721                             0x7fffffff)) {
 722                 CERROR("dirty %lu - dirty_max %lu too big???\n",
 723                        cli->cl_dirty_pages, cli->cl_dirty_max_pages);
 724                 oa->o_undirty = 0;
 725         } else {
 726                 unsigned long nrpages;
 727                 unsigned long undirty;
 728
 729                 nrpages = cli->cl_max_pages_per_rpc;
 730                 nrpages *= cli->cl_max_rpcs_in_flight + 1;
 731                 nrpages = max(nrpages, cli->cl_dirty_max_pages);
 732                 undirty = nrpages << PAGE_SHIFT;
 733                 if (OCD_HAS_FLAG(&cli->cl_import->imp_connect_data,
 734                                  GRANT_PARAM)) {
 735                         int nrextents;
 736
 737                         /* take extent tax into account when asking for more
 738                          * grant space */
 739                         nrextents = (nrpages + cli->cl_max_extent_pages - 1)  /
 740                                      cli->cl_max_extent_pages;
 741                         undirty += nrextents * cli->cl_grant_extent_tax;
 742                 }
 743                 /* Do not ask for more than OBD_MAX_GRANT - a margin for server
 744                  * to add extent tax, etc.
 745                  */
 746                 oa->o_undirty = min(undirty, OBD_MAX_GRANT &
 747                                     ~(PTLRPC_MAX_BRW_SIZE * 4UL));
 748         }
 749         oa->o_grant = cli->cl_avail_grant + cli->cl_reserved_grant;
 750         oa->o_dropped = cli->cl_lost_grant;
 751         cli->cl_lost_grant = 0;
 752         spin_unlock(&cli->cl_loi_list_lock);
 753         CDEBUG(D_CACHE, "dirty: %llu undirty: %u dropped %u grant: %llu\n",
 754                oa->o_dirty, oa->o_undirty, oa->o_dropped, oa->o_grant);
 755 }
 756
 757 void osc_update_next_shrink(struct client_obd *cli)
 758 {
 759         cli->cl_next_shrink_grant = ktime_get_seconds() +
 760                                     cli->cl_grant_shrink_interval;
 761
 762         CDEBUG(D_CACHE, "next time %lld to shrink grant\n",
 763                cli->cl_next_shrink_grant);
 764 }
 765
 766 static void __osc_update_grant(struct client_obd *cli, u64 grant)
 767 {
 768         spin_lock(&cli->cl_loi_list_lock);
 769         cli->cl_avail_grant += grant;
 770         spin_unlock(&cli->cl_loi_list_lock);
 771 }
 772
 773 static void osc_update_grant(struct client_obd *cli, struct ost_body *body)
 774 {
 775         if (body->oa.o_valid & OBD_MD_FLGRANT) {
 776                 CDEBUG(D_CACHE, "got %llu extra grant\n", body->oa.o_grant);
 777                 __osc_update_grant(cli, body->oa.o_grant);
 778         }
 779 }
 780
 781 /**
 782  * grant thread data for shrinking space.
 783  */
 784 struct grant_thread_data {
 785         struct list_head        gtd_clients;
 786         struct mutex            gtd_mutex;
 787         unsigned long           gtd_stopped:1;
 788 };
 789 static struct grant_thread_data client_gtd;
 790
 791 static int osc_shrink_grant_interpret(const struct lu_env *env,
 792                                       struct ptlrpc_request *req,
 793                                       void *args, int rc)
 794 {
 795         struct osc_grant_args *aa = args;
 796         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
 797         struct ost_body *body;
 798
 799         if (rc != 0) {
 800                 __osc_update_grant(cli, aa->aa_oa->o_grant);
 801                 GOTO(out, rc);
 802         }
 803
 804         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 805         LASSERT(body);
 806         osc_update_grant(cli, body);
 807 out:
 808         OBD_SLAB_FREE_PTR(aa->aa_oa, osc_obdo_kmem);
 809         aa->aa_oa = NULL;
 810
 811         return rc;
 812 }
 813
 814 static void osc_shrink_grant_local(struct client_obd *cli, struct obdo *oa)
 815 {
 816         spin_lock(&cli->cl_loi_list_lock);
 817         oa->o_grant = cli->cl_avail_grant / 4;
 818         cli->cl_avail_grant -= oa->o_grant;
 819         spin_unlock(&cli->cl_loi_list_lock);
 820         if (!(oa->o_valid & OBD_MD_FLFLAGS)) {
 821                 oa->o_valid |= OBD_MD_FLFLAGS;
 822                 oa->o_flags = 0;
 823         }
 824         oa->o_flags |= OBD_FL_SHRINK_GRANT;
 825         osc_update_next_shrink(cli);
 826 }
 827
 828 /* Shrink the current grant, either from some large amount to enough for a
 829  * full set of in-flight RPCs, or if we have already shrunk to that limit
 830  * then to enough for a single RPC.  This avoids keeping more grant than
 831  * needed, and avoids shrinking the grant piecemeal. */
 832 static int osc_shrink_grant(struct client_obd *cli)
 833 {
 834         __u64 target_bytes = (cli->cl_max_rpcs_in_flight + 1) *
 835                              (cli->cl_max_pages_per_rpc << PAGE_SHIFT);
 836
 837         spin_lock(&cli->cl_loi_list_lock);
 838         if (cli->cl_avail_grant <= target_bytes)
 839                 target_bytes = cli->cl_max_pages_per_rpc << PAGE_SHIFT;
 840         spin_unlock(&cli->cl_loi_list_lock);
 841
 842         return osc_shrink_grant_to_target(cli, target_bytes);
 843 }
 844
 845 int osc_shrink_grant_to_target(struct client_obd *cli, __u64 target_bytes)
 846 {
 847         int                     rc = 0;
 848         struct ost_body        *body;
 849         ENTRY;
 850
 851         spin_lock(&cli->cl_loi_list_lock);
 852         /* Don't shrink if we are already above or below the desired limit
 853          * We don't want to shrink below a single RPC, as that will negatively
 854          * impact block allocation and long-term performance. */
 855         if (target_bytes < cli->cl_max_pages_per_rpc << PAGE_SHIFT)
 856                 target_bytes = cli->cl_max_pages_per_rpc << PAGE_SHIFT;
 857
 858         if (target_bytes >= cli->cl_avail_grant) {
 859                 spin_unlock(&cli->cl_loi_list_lock);
 860                 RETURN(0);
 861         }
 862         spin_unlock(&cli->cl_loi_list_lock);
 863
 864         OBD_ALLOC_PTR(body);
 865         if (!body)
 866                 RETURN(-ENOMEM);
 867
 868         osc_announce_cached(cli, &body->oa, 0);
 869
 870         spin_lock(&cli->cl_loi_list_lock);
 871         if (target_bytes >= cli->cl_avail_grant) {
 872                 /* available grant has changed since target calculation */
 873                 spin_unlock(&cli->cl_loi_list_lock);
 874                 GOTO(out_free, rc = 0);
 875         }
 876         body->oa.o_grant = cli->cl_avail_grant - target_bytes;
 877         cli->cl_avail_grant = target_bytes;
 878         spin_unlock(&cli->cl_loi_list_lock);
 879         if (!(body->oa.o_valid & OBD_MD_FLFLAGS)) {
 880                 body->oa.o_valid |= OBD_MD_FLFLAGS;
 881                 body->oa.o_flags = 0;
 882         }
 883         body->oa.o_flags |= OBD_FL_SHRINK_GRANT;
 884         osc_update_next_shrink(cli);
 885
 886         rc = osc_set_info_async(NULL, cli->cl_import->imp_obd->obd_self_export,
 887                                 sizeof(KEY_GRANT_SHRINK), KEY_GRANT_SHRINK,
 888                                 sizeof(*body), body, NULL);
 889         if (rc != 0)
 890                 __osc_update_grant(cli, body->oa.o_grant);
 891 out_free:
 892         OBD_FREE_PTR(body);
 893         RETURN(rc);
 894 }
 895
 896 static int osc_should_shrink_grant(struct client_obd *client)
 897 {
 898         time64_t next_shrink = client->cl_next_shrink_grant;
 899
 900         if (client->cl_import == NULL)
 901                 return 0;
 902
 903         if (!OCD_HAS_FLAG(&client->cl_import->imp_connect_data, GRANT_SHRINK) ||
 904             client->cl_import->imp_grant_shrink_disabled) {
 905                 osc_update_next_shrink(client);
 906                 return 0;
 907         }
 908
 909         if (ktime_get_seconds() >= next_shrink - 5) {
 910                 /* Get the current RPC size directly, instead of going via:
 911                  * cli_brw_size(obd->u.cli.cl_import->imp_obd->obd_self_export)
 912                  * Keep comment here so that it can be found by searching. */
 913                 int brw_size = client->cl_max_pages_per_rpc << PAGE_SHIFT;
 914
 915                 if (client->cl_import->imp_state == LUSTRE_IMP_FULL &&
 916                     client->cl_avail_grant > brw_size)
 917                         return 1;
 918                 else
 919                         osc_update_next_shrink(client);
 920         }
 921         return 0;
 922 }
 923
 924 #define GRANT_SHRINK_RPC_BATCH  100
 925
 926 static struct delayed_work work;
 927
 928 static void osc_grant_work_handler(struct work_struct *data)
 929 {
 930         struct client_obd *cli;
 931         int rpc_sent;
 932         bool init_next_shrink = true;
 933         time64_t next_shrink = ktime_get_seconds() + GRANT_SHRINK_INTERVAL;
 934
 935         rpc_sent = 0;
 936         mutex_lock(&client_gtd.gtd_mutex);
 937         list_for_each_entry(cli, &client_gtd.gtd_clients,
 938                             cl_grant_chain) {
 939                 if (rpc_sent < GRANT_SHRINK_RPC_BATCH &&
 940                     osc_should_shrink_grant(cli)) {
 941                         osc_shrink_grant(cli);
 942                         rpc_sent++;
 943                 }
 944
 945                 if (!init_next_shrink) {
 946                         if (cli->cl_next_shrink_grant < next_shrink &&
 947                             cli->cl_next_shrink_grant > ktime_get_seconds())
 948                                 next_shrink = cli->cl_next_shrink_grant;
 949                 } else {
 950                         init_next_shrink = false;
 951                         next_shrink = cli->cl_next_shrink_grant;
 952                 }
 953         }
 954         mutex_unlock(&client_gtd.gtd_mutex);
 955
 956         if (client_gtd.gtd_stopped == 1)
 957                 return;
 958
 959         if (next_shrink > ktime_get_seconds()) {
 960                 time64_t delay = next_shrink - ktime_get_seconds();
 961
 962                 schedule_delayed_work(&work, cfs_time_seconds(delay));
 963         } else {
 964                 schedule_work(&work.work);
 965         }
 966 }
 967
 968 void osc_schedule_grant_work(void)
 969 {
 970         cancel_delayed_work_sync(&work);
 971         schedule_work(&work.work);
 972 }
 973
 974 /**
 975  * Start grant thread for returing grant to server for idle clients.
 976  */
 977 static int osc_start_grant_work(void)
 978 {
 979         client_gtd.gtd_stopped = 0;
 980         mutex_init(&client_gtd.gtd_mutex);
 981         INIT_LIST_HEAD(&client_gtd.gtd_clients);
 982
 983         INIT_DELAYED_WORK(&work, osc_grant_work_handler);
 984         schedule_work(&work.work);
 985
 986         return 0;
 987 }
 988
 989 static void osc_stop_grant_work(void)
 990 {
 991         client_gtd.gtd_stopped = 1;
 992         cancel_delayed_work_sync(&work);
 993 }
 994
 995 static void osc_add_grant_list(struct client_obd *client)
 996 {
 997         mutex_lock(&client_gtd.gtd_mutex);
 998         list_add(&client->cl_grant_chain, &client_gtd.gtd_clients);
 999         mutex_unlock(&client_gtd.gtd_mutex);
1000 }
1001
1002 static void osc_del_grant_list(struct client_obd *client)
1003 {
1004         if (list_empty(&client->cl_grant_chain))
1005                 return;
1006
1007         mutex_lock(&client_gtd.gtd_mutex);
1008         list_del_init(&client->cl_grant_chain);
1009         mutex_unlock(&client_gtd.gtd_mutex);
1010 }
1011
1012 void osc_init_grant(struct client_obd *cli, struct obd_connect_data *ocd)
1013 {
1014         /*
1015          * ocd_grant is the total grant amount we're expect to hold: if we've
1016          * been evicted, it's the new avail_grant amount, cl_dirty_pages will
1017          * drop to 0 as inflight RPCs fail out; otherwise, it's avail_grant +
1018          * dirty.
1019          *
1020          * race is tolerable here: if we're evicted, but imp_state already
1021          * left EVICTED state, then cl_dirty_pages must be 0 already.
1022          */
1023         spin_lock(&cli->cl_loi_list_lock);
1024         cli->cl_avail_grant = ocd->ocd_grant;
1025         if (cli->cl_import->imp_state != LUSTRE_IMP_EVICTED) {
1026                 cli->cl_avail_grant -= cli->cl_reserved_grant;
1027                 if (OCD_HAS_FLAG(ocd, GRANT_PARAM))
1028                         cli->cl_avail_grant -= cli->cl_dirty_grant;
1029                 else
1030                         cli->cl_avail_grant -=
1031                                         cli->cl_dirty_pages << PAGE_SHIFT;
1032         }
1033
1034         if (OCD_HAS_FLAG(ocd, GRANT_PARAM)) {
1035                 u64 size;
1036                 int chunk_mask;
1037
1038                 /* overhead for each extent insertion */
1039                 cli->cl_grant_extent_tax = ocd->ocd_grant_tax_kb << 10;
1040                 /* determine the appropriate chunk size used by osc_extent. */
1041                 cli->cl_chunkbits = max_t(int, PAGE_SHIFT,
1042                                           ocd->ocd_grant_blkbits);
1043                 /* max_pages_per_rpc must be chunk aligned */
1044                 chunk_mask = ~((1 << (cli->cl_chunkbits - PAGE_SHIFT)) - 1);
1045                 cli->cl_max_pages_per_rpc = (cli->cl_max_pages_per_rpc +
1046                                              ~chunk_mask) & chunk_mask;
1047                 /* determine maximum extent size, in #pages */
1048                 size = (u64)ocd->ocd_grant_max_blks << ocd->ocd_grant_blkbits;
1049                 cli->cl_max_extent_pages = size >> PAGE_SHIFT;
1050                 if (cli->cl_max_extent_pages == 0)
1051                         cli->cl_max_extent_pages = 1;
1052         } else {
1053                 cli->cl_grant_extent_tax = 0;
1054                 cli->cl_chunkbits = PAGE_SHIFT;
1055                 cli->cl_max_extent_pages = DT_MAX_BRW_PAGES;
1056         }
1057         spin_unlock(&cli->cl_loi_list_lock);
1058
1059         CDEBUG(D_CACHE,
1060                "%s, setting cl_avail_grant: %ld cl_lost_grant: %ld. chunk bits: %d cl_max_extent_pages: %d\n",
1061                cli_name(cli),
1062                cli->cl_avail_grant, cli->cl_lost_grant, cli->cl_chunkbits,
1063                cli->cl_max_extent_pages);
1064
1065         if (OCD_HAS_FLAG(ocd, GRANT_SHRINK) && list_empty(&cli->cl_grant_chain))
1066                 osc_add_grant_list(cli);
1067 }
1068 EXPORT_SYMBOL(osc_init_grant);
1069
1070 /* We assume that the reason this OSC got a short read is because it read
1071  * beyond the end of a stripe file; i.e. lustre is reading a sparse file
1072  * via the LOV, and it _knows_ it's reading inside the file, it's just that
1073  * this stripe never got written at or beyond this stripe offset yet. */
1074 static void handle_short_read(int nob_read, size_t page_count,
1075                               struct brw_page **pga)
1076 {
1077         char *ptr;
1078         int i = 0;
1079
1080         /* skip bytes read OK */
1081         while (nob_read > 0) {
1082                 LASSERT (page_count > 0);
1083
1084                 if (pga[i]->count > nob_read) {
1085                         /* EOF inside this page */
1086                         ptr = kmap(pga[i]->pg) +
1087                                 (pga[i]->off & ~PAGE_MASK);
1088                         memset(ptr + nob_read, 0, pga[i]->count - nob_read);
1089                         kunmap(pga[i]->pg);
1090                         page_count--;
1091                         i++;
1092                         break;
1093                 }
1094
1095                 nob_read -= pga[i]->count;
1096                 page_count--;
1097                 i++;
1098         }
1099
1100         /* zero remaining pages */
1101         while (page_count-- > 0) {
1102                 ptr = kmap(pga[i]->pg) + (pga[i]->off & ~PAGE_MASK);
1103                 memset(ptr, 0, pga[i]->count);
1104                 kunmap(pga[i]->pg);
1105                 i++;
1106         }
1107 }
1108
1109 static int check_write_rcs(struct ptlrpc_request *req,
1110                            int requested_nob, int niocount,
1111                            size_t page_count, struct brw_page **pga)
1112 {
1113         int     i;
1114         __u32   *remote_rcs;
1115
1116         remote_rcs = req_capsule_server_sized_get(&req->rq_pill, &RMF_RCS,
1117                                                   sizeof(*remote_rcs) *
1118                                                   niocount);
1119         if (remote_rcs == NULL) {
1120                 CDEBUG(D_INFO, "Missing/short RC vector on BRW_WRITE reply\n");
1121                 return(-EPROTO);
1122         }
1123
1124         /* return error if any niobuf was in error */
1125         for (i = 0; i < niocount; i++) {
1126                 if ((int)remote_rcs[i] < 0) {
1127                         CDEBUG(D_INFO, "rc[%d]: %d req %p\n",
1128                                i, remote_rcs[i], req);
1129                         return remote_rcs[i];
1130                 }
1131
1132                 if (remote_rcs[i] != 0) {
1133                         CDEBUG(D_INFO, "rc[%d] invalid (%d) req %p\n",
1134                                 i, remote_rcs[i], req);
1135                         return(-EPROTO);
1136                 }
1137         }
1138         if (req->rq_bulk != NULL &&
1139             req->rq_bulk->bd_nob_transferred != requested_nob) {
1140                 CERROR("Unexpected # bytes transferred: %d (requested %d)\n",
1141                        req->rq_bulk->bd_nob_transferred, requested_nob);
1142                 return(-EPROTO);
1143         }
1144
1145         return (0);
1146 }
1147
1148 static inline int can_merge_pages(struct brw_page *p1, struct brw_page *p2)
1149 {
1150         if (p1->flag != p2->flag) {
1151                 unsigned mask = ~(OBD_BRW_FROM_GRANT | OBD_BRW_NOCACHE |
1152                                   OBD_BRW_SYNC       | OBD_BRW_ASYNC   |
1153                                   OBD_BRW_NOQUOTA    | OBD_BRW_SOFT_SYNC);
1154
1155                 /* warn if we try to combine flags that we don't know to be
1156                  * safe to combine */
1157                 if (unlikely((p1->flag & mask) != (p2->flag & mask))) {
1158                         CWARN("Saw flags 0x%x and 0x%x in the same brw, please "
1159                               "report this at https://jira.whamcloud.com/\n",
1160                               p1->flag, p2->flag);
1161                 }
1162                 return 0;
1163         }
1164
1165         return (p1->off + p1->count == p2->off);
1166 }
1167
1168 #if IS_ENABLED(CONFIG_CRC_T10DIF)
1169 static int osc_checksum_bulk_t10pi(const char *obd_name, int nob,
1170                                    size_t pg_count, struct brw_page **pga,
1171                                    int opc, obd_dif_csum_fn *fn,
1172                                    int sector_size,
1173                                    u32 *check_sum)
1174 {
1175         struct ahash_request *req;
1176         /* Used Adler as the default checksum type on top of DIF tags */
1177         unsigned char cfs_alg = cksum_obd2cfs(OBD_CKSUM_T10_TOP);
1178         struct page *__page;
1179         unsigned char *buffer;
1180         __u16 *guard_start;
1181         unsigned int bufsize;
1182         int guard_number;
1183         int used_number = 0;
1184         int used;
1185         u32 cksum;
1186         int rc = 0;
1187         int i = 0;
1188
1189         LASSERT(pg_count > 0);
1190
1191         __page = alloc_page(GFP_KERNEL);
1192         if (__page == NULL)
1193                 return -ENOMEM;
1194
1195         req = cfs_crypto_hash_init(cfs_alg, NULL, 0);
1196         if (IS_ERR(req)) {
1197                 rc = PTR_ERR(req);
1198                 CERROR("%s: unable to initialize checksum hash %s: rc = %d\n",
1199                        obd_name, cfs_crypto_hash_name(cfs_alg), rc);
1200                 GOTO(out, rc);
1201         }
1202
1203         buffer = kmap(__page);
1204         guard_start = (__u16 *)buffer;
1205         guard_number = PAGE_SIZE / sizeof(*guard_start);
1206         while (nob > 0 && pg_count > 0) {
1207                 unsigned int count = pga[i]->count > nob ? nob : pga[i]->count;
1208
1209                 /* corrupt the data before we compute the checksum, to
1210                  * simulate an OST->client data error */
1211                 if (unlikely(i == 0 && opc == OST_READ &&
1212                              OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_RECEIVE))) {
1213                         unsigned char *ptr = kmap(pga[i]->pg);
1214                         int off = pga[i]->off & ~PAGE_MASK;
1215
1216                         memcpy(ptr + off, "bad1", min_t(typeof(nob), 4, nob));
1217                         kunmap(pga[i]->pg);
1218                 }
1219
1220                 /*
1221                  * The left guard number should be able to hold checksums of a
1222                  * whole page
1223                  */
1224                 rc = obd_page_dif_generate_buffer(obd_name, pga[i]->pg,
1225                                                   pga[i]->off & ~PAGE_MASK,
1226                                                   count,
1227                                                   guard_start + used_number,
1228                                                   guard_number - used_number,
1229                                                   &used, sector_size,
1230                                                   fn);
1231                 if (rc)
1232                         break;
1233
1234                 used_number += used;
1235                 if (used_number == guard_number) {
1236                         cfs_crypto_hash_update_page(req, __page, 0,
1237                                 used_number * sizeof(*guard_start));
1238                         used_number = 0;
1239                 }
1240
1241                 nob -= pga[i]->count;
1242                 pg_count--;
1243                 i++;
1244         }
1245         kunmap(__page);
1246         if (rc)
1247                 GOTO(out, rc);
1248
1249         if (used_number != 0)
1250                 cfs_crypto_hash_update_page(req, __page, 0,
1251                         used_number * sizeof(*guard_start));
1252
1253         bufsize = sizeof(cksum);
1254         cfs_crypto_hash_final(req, (unsigned char *)&cksum, &bufsize);
1255
1256         /* For sending we only compute the wrong checksum instead
1257          * of corrupting the data so it is still correct on a redo */
1258         if (opc == OST_WRITE && OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_SEND))
1259                 cksum++;
1260
1261         *check_sum = cksum;
1262 out:
1263         __free_page(__page);
1264         return rc;
1265 }
1266 #else /* !CONFIG_CRC_T10DIF */
1267 #define obd_dif_ip_fn NULL
1268 #define obd_dif_crc_fn NULL
1269 #define osc_checksum_bulk_t10pi(name, nob, pgc, pga, opc, fn, ssize, csum)  \
1270         -EOPNOTSUPP
1271 #endif /* CONFIG_CRC_T10DIF */
1272
1273 static int osc_checksum_bulk(int nob, size_t pg_count,
1274                              struct brw_page **pga, int opc,
1275                              enum cksum_types cksum_type,
1276                              u32 *cksum)
1277 {
1278         int                             i = 0;
1279         struct ahash_request           *req;
1280         unsigned int                    bufsize;
1281         unsigned char                   cfs_alg = cksum_obd2cfs(cksum_type);
1282
1283         LASSERT(pg_count > 0);
1284
1285         req = cfs_crypto_hash_init(cfs_alg, NULL, 0);
1286         if (IS_ERR(req)) {
1287                 CERROR("Unable to initialize checksum hash %s\n",
1288                        cfs_crypto_hash_name(cfs_alg));
1289                 return PTR_ERR(req);
1290         }
1291
1292         while (nob > 0 && pg_count > 0) {
1293                 unsigned int count = pga[i]->count > nob ? nob : pga[i]->count;
1294
1295                 /* corrupt the data before we compute the checksum, to
1296                  * simulate an OST->client data error */
1297                 if (i == 0 && opc == OST_READ &&
1298                     OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_RECEIVE)) {
1299                         unsigned char *ptr = kmap(pga[i]->pg);
1300                         int off = pga[i]->off & ~PAGE_MASK;
1301
1302                         memcpy(ptr + off, "bad1", min_t(typeof(nob), 4, nob));
1303                         kunmap(pga[i]->pg);
1304                 }
1305                 cfs_crypto_hash_update_page(req, pga[i]->pg,
1306                                             pga[i]->off & ~PAGE_MASK,
1307                                             count);
1308                 LL_CDEBUG_PAGE(D_PAGE, pga[i]->pg, "off %d\n",
1309                                (int)(pga[i]->off & ~PAGE_MASK));
1310
1311                 nob -= pga[i]->count;
1312                 pg_count--;
1313                 i++;
1314         }
1315
1316         bufsize = sizeof(*cksum);
1317         cfs_crypto_hash_final(req, (unsigned char *)cksum, &bufsize);
1318
1319         /* For sending we only compute the wrong checksum instead
1320          * of corrupting the data so it is still correct on a redo */
1321         if (opc == OST_WRITE && OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_SEND))
1322                 (*cksum)++;
1323
1324         return 0;
1325 }
1326
1327 static int osc_checksum_bulk_rw(const char *obd_name,
1328                                 enum cksum_types cksum_type,
1329                                 int nob, size_t pg_count,
1330                                 struct brw_page **pga, int opc,
1331                                 u32 *check_sum)
1332 {
1333         obd_dif_csum_fn *fn = NULL;
1334         int sector_size = 0;
1335         int rc;
1336
1337         ENTRY;
1338         obd_t10_cksum2dif(cksum_type, &fn, &sector_size);
1339
1340         if (fn)
1341                 rc = osc_checksum_bulk_t10pi(obd_name, nob, pg_count, pga,
1342                                              opc, fn, sector_size, check_sum);
1343         else
1344                 rc = osc_checksum_bulk(nob, pg_count, pga, opc, cksum_type,
1345                                        check_sum);
1346
1347         RETURN(rc);
1348 }
1349
1350 static inline void osc_release_bounce_pages(struct brw_page **pga,
1351                                             u32 page_count)
1352 {
1353 #ifdef HAVE_LUSTRE_CRYPTO
1354         int i;
1355
1356         for (i = 0; i < page_count; i++) {
1357                 if (pga[i]->pg->mapping)
1358                         /* bounce pages are unmapped */
1359                         continue;
1360                 if (pga[i]->flag & OBD_BRW_SYNC)
1361                         /* sync transfer cannot have encrypted pages */
1362                         continue;
1363                 llcrypt_finalize_bounce_page(&pga[i]->pg);
1364                 pga[i]->count -= pga[i]->bp_count_diff;
1365                 pga[i]->off += pga[i]->bp_off_diff;
1366         }
1367 #endif
1368 }
1369
1370 static int
1371 osc_brw_prep_request(int cmd, struct client_obd *cli, struct obdo *oa,
1372                      u32 page_count, struct brw_page **pga,
1373                      struct ptlrpc_request **reqp, int resend)
1374 {
1375         struct ptlrpc_request *req;
1376         struct ptlrpc_bulk_desc *desc;
1377         struct ost_body *body;
1378         struct obd_ioobj *ioobj;
1379         struct niobuf_remote *niobuf;
1380         int niocount, i, requested_nob, opc, rc, short_io_size = 0;
1381         struct osc_brw_async_args *aa;
1382         struct req_capsule *pill;
1383         struct brw_page *pg_prev;
1384         void *short_io_buf;
1385         const char *obd_name = cli->cl_import->imp_obd->obd_name;
1386         struct inode *inode;
1387
1388         ENTRY;
1389         inode = page2inode(pga[0]->pg);
1390         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_BRW_PREP_REQ))
1391                 RETURN(-ENOMEM); /* Recoverable */
1392         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_BRW_PREP_REQ2))
1393                 RETURN(-EINVAL); /* Fatal */
1394
1395         if ((cmd & OBD_BRW_WRITE) != 0) {
1396                 opc = OST_WRITE;
1397                 req = ptlrpc_request_alloc_pool(cli->cl_import,
1398                                                 osc_rq_pool,
1399                                                 &RQF_OST_BRW_WRITE);
1400         } else {
1401                 opc = OST_READ;
1402                 req = ptlrpc_request_alloc(cli->cl_import, &RQF_OST_BRW_READ);
1403         }
1404         if (req == NULL)
1405                 RETURN(-ENOMEM);
1406
1407         if (opc == OST_WRITE && inode && IS_ENCRYPTED(inode)) {
1408                 for (i = 0; i < page_count; i++) {
1409                         struct brw_page *pg = pga[i];
1410                         struct page *data_page = NULL;
1411                         bool retried = false;
1412                         bool lockedbymyself;
1413
1414 retry_encrypt:
1415                         /* The page can already be locked when we arrive here.
1416                          * This is possible when cl_page_assume/vvp_page_assume
1417                          * is stuck on wait_on_page_writeback with page lock
1418                          * held. In this case there is no risk for the lock to
1419                          * be released while we are doing our encryption
1420                          * processing, because writeback against that page will
1421                          * end in vvp_page_completion_write/cl_page_completion,
1422                          * which means only once the page is fully processed.
1423                          */
1424                         lockedbymyself = trylock_page(pg->pg);
1425                         data_page =
1426                                 llcrypt_encrypt_pagecache_blocks(pg->pg,
1427                                                                  PAGE_SIZE, 0,
1428                                                                  GFP_NOFS);
1429                         if (lockedbymyself)
1430                                 unlock_page(pg->pg);
1431                         if (IS_ERR(data_page)) {
1432                                 rc = PTR_ERR(data_page);
1433                                 if (rc == -ENOMEM && !retried) {
1434                                         retried = true;
1435                                         rc = 0;
1436                                         goto retry_encrypt;
1437                                 }
1438                                 ptlrpc_request_free(req);
1439                                 RETURN(rc);
1440                         }
1441                         pg->pg = data_page;
1442                         /* there should be no gap in the middle of page array */
1443                         if (i == page_count - 1) {
1444                                 struct osc_async_page *oap = brw_page2oap(pg);
1445
1446                                 oa->o_size = oap->oap_count +
1447                                         oap->oap_obj_off + oap->oap_page_off;
1448                         }
1449                         /* len is forced to PAGE_SIZE, and poff to 0
1450                          * so store the old, clear text info
1451                          */
1452                         pg->bp_count_diff = PAGE_SIZE - pg->count;
1453                         pg->count = PAGE_SIZE;
1454                         pg->bp_off_diff = pg->off & ~PAGE_MASK;
1455                         pg->off = pg->off & PAGE_MASK;
1456                 }
1457         }
1458
1459         for (niocount = i = 1; i < page_count; i++) {
1460                 if (!can_merge_pages(pga[i - 1], pga[i]))
1461                         niocount++;
1462         }
1463
1464         pill = &req->rq_pill;
1465         req_capsule_set_size(pill, &RMF_OBD_IOOBJ, RCL_CLIENT,
1466                              sizeof(*ioobj));
1467         req_capsule_set_size(pill, &RMF_NIOBUF_REMOTE, RCL_CLIENT,
1468                              niocount * sizeof(*niobuf));
1469
1470         for (i = 0; i < page_count; i++)
1471                 short_io_size += pga[i]->count;
1472
1473         /* Check if read/write is small enough to be a short io. */
1474         if (short_io_size > cli->cl_max_short_io_bytes || niocount > 1 ||
1475             !imp_connect_shortio(cli->cl_import))
1476                 short_io_size = 0;
1477
1478         req_capsule_set_size(pill, &RMF_SHORT_IO, RCL_CLIENT,
1479                              opc == OST_READ ? 0 : short_io_size);
1480         if (opc == OST_READ)
1481                 req_capsule_set_size(pill, &RMF_SHORT_IO, RCL_SERVER,
1482                                      short_io_size);
1483
1484         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, opc);
1485         if (rc) {
1486                 ptlrpc_request_free(req);
1487                 RETURN(rc);
1488         }
1489         osc_set_io_portal(req);
1490
1491         ptlrpc_at_set_req_timeout(req);
1492         /* ask ptlrpc not to resend on EINPROGRESS since BRWs have their own
1493          * retry logic */
1494         req->rq_no_retry_einprogress = 1;
1495
1496         if (short_io_size != 0) {
1497                 desc = NULL;
1498                 short_io_buf = NULL;
1499                 goto no_bulk;
1500         }
1501
1502         desc = ptlrpc_prep_bulk_imp(req, page_count,
1503                 cli->cl_import->imp_connect_data.ocd_brw_size >> LNET_MTU_BITS,
1504                 (opc == OST_WRITE ? PTLRPC_BULK_GET_SOURCE :
1505                         PTLRPC_BULK_PUT_SINK),
1506                 OST_BULK_PORTAL,
1507                 &ptlrpc_bulk_kiov_pin_ops);
1508
1509         if (desc == NULL)
1510                 GOTO(out, rc = -ENOMEM);
1511         /* NB request now owns desc and will free it when it gets freed */
1512 no_bulk:
1513         body = req_capsule_client_get(pill, &RMF_OST_BODY);
1514         ioobj = req_capsule_client_get(pill, &RMF_OBD_IOOBJ);
1515         niobuf = req_capsule_client_get(pill, &RMF_NIOBUF_REMOTE);
1516         LASSERT(body != NULL && ioobj != NULL && niobuf != NULL);
1517
1518         lustre_set_wire_obdo(&req->rq_import->imp_connect_data, &body->oa, oa);
1519
1520         /* For READ and WRITE, we can't fill o_uid and o_gid using from_kuid()
1521          * and from_kgid(), because they are asynchronous. Fortunately, variable
1522          * oa contains valid o_uid and o_gid in these two operations.
1523          * Besides, filling o_uid and o_gid is enough for nrs-tbf, see LU-9658.
1524          * OBD_MD_FLUID and OBD_MD_FLUID is not set in order to avoid breaking
1525          * other process logic */
1526         body->oa.o_uid = oa->o_uid;
1527         body->oa.o_gid = oa->o_gid;
1528
1529         obdo_to_ioobj(oa, ioobj);
1530         ioobj->ioo_bufcnt = niocount;
1531         /* The high bits of ioo_max_brw tells server _maximum_ number of bulks
1532          * that might be send for this request.  The actual number is decided
1533          * when the RPC is finally sent in ptlrpc_register_bulk(). It sends
1534          * "max - 1" for old client compatibility sending "0", and also so the
1535          * the actual maximum is a power-of-two number, not one less. LU-1431 */
1536         if (desc != NULL)
1537                 ioobj_max_brw_set(ioobj, desc->bd_md_max_brw);
1538         else /* short io */
1539                 ioobj_max_brw_set(ioobj, 0);
1540
1541         if (short_io_size != 0) {
1542                 if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0) {
1543                         body->oa.o_valid |= OBD_MD_FLFLAGS;
1544                         body->oa.o_flags = 0;
1545                 }
1546                 body->oa.o_flags |= OBD_FL_SHORT_IO;
1547                 CDEBUG(D_CACHE, "Using short io for data transfer, size = %d\n",
1548                        short_io_size);
1549                 if (opc == OST_WRITE) {
1550                         short_io_buf = req_capsule_client_get(pill,
1551                                                               &RMF_SHORT_IO);
1552                         LASSERT(short_io_buf != NULL);
1553                 }
1554         }
1555
1556         LASSERT(page_count > 0);
1557         pg_prev = pga[0];
1558         for (requested_nob = i = 0; i < page_count; i++, niobuf++) {
1559                 struct brw_page *pg = pga[i];
1560                 int poff = pg->off & ~PAGE_MASK;
1561
1562                 LASSERT(pg->count > 0);
1563                 /* make sure there is no gap in the middle of page array */
1564                 LASSERTF(page_count == 1 ||
1565                          (ergo(i == 0, poff + pg->count == PAGE_SIZE) &&
1566                           ergo(i > 0 && i < page_count - 1,
1567                                poff == 0 && pg->count == PAGE_SIZE)   &&
1568                           ergo(i == page_count - 1, poff == 0)),
1569                          "i: %d/%d pg: %p off: %llu, count: %u\n",
1570                          i, page_count, pg, pg->off, pg->count);
1571                 LASSERTF(i == 0 || pg->off > pg_prev->off,
1572                          "i %d p_c %u pg %p [pri %lu ind %lu] off %llu"
1573                          " prev_pg %p [pri %lu ind %lu] off %llu\n",
1574                          i, page_count,
1575                          pg->pg, page_private(pg->pg), pg->pg->index, pg->off,
1576                          pg_prev->pg, page_private(pg_prev->pg),
1577                          pg_prev->pg->index, pg_prev->off);
1578                 LASSERT((pga[0]->flag & OBD_BRW_SRVLOCK) ==
1579                         (pg->flag & OBD_BRW_SRVLOCK));
1580                 if (short_io_size != 0 && opc == OST_WRITE) {
1581                         unsigned char *ptr = kmap_atomic(pg->pg);
1582
1583                         LASSERT(short_io_size >= requested_nob + pg->count);
1584                         memcpy(short_io_buf + requested_nob,
1585                                ptr + poff,
1586                                pg->count);
1587                         kunmap_atomic(ptr);
1588                 } else if (short_io_size == 0) {
1589                         desc->bd_frag_ops->add_kiov_frag(desc, pg->pg, poff,
1590                                                          pg->count);
1591                 }
1592                 requested_nob += pg->count;
1593
1594                 if (i > 0 && can_merge_pages(pg_prev, pg)) {
1595                         niobuf--;
1596                         niobuf->rnb_len += pg->count;
1597                 } else {
1598                         niobuf->rnb_offset = pg->off;
1599                         niobuf->rnb_len    = pg->count;
1600                         niobuf->rnb_flags  = pg->flag;
1601                 }
1602                 pg_prev = pg;
1603         }
1604
1605         LASSERTF((void *)(niobuf - niocount) ==
1606                 req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE),
1607                 "want %p - real %p\n", req_capsule_client_get(&req->rq_pill,
1608                 &RMF_NIOBUF_REMOTE), (void *)(niobuf - niocount));
1609
1610         osc_announce_cached(cli, &body->oa, opc == OST_WRITE ? requested_nob:0);
1611         if (resend) {
1612                 if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0) {
1613                         body->oa.o_valid |= OBD_MD_FLFLAGS;
1614                         body->oa.o_flags = 0;
1615                 }
1616                 body->oa.o_flags |= OBD_FL_RECOV_RESEND;
1617         }
1618
1619         if (osc_should_shrink_grant(cli))
1620                 osc_shrink_grant_local(cli, &body->oa);
1621
1622         /* size[REQ_REC_OFF] still sizeof (*body) */
1623         if (opc == OST_WRITE) {
1624                 if (cli->cl_checksum &&
1625                     !sptlrpc_flavor_has_bulk(&req->rq_flvr)) {
1626                         /* store cl_cksum_type in a local variable since
1627                          * it can be changed via lprocfs */
1628                         enum cksum_types cksum_type = cli->cl_cksum_type;
1629
1630                         if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0)
1631                                 body->oa.o_flags = 0;
1632
1633                         body->oa.o_flags |= obd_cksum_type_pack(obd_name,
1634                                                                 cksum_type);
1635                         body->oa.o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1636
1637                         rc = osc_checksum_bulk_rw(obd_name, cksum_type,
1638                                                   requested_nob, page_count,
1639                                                   pga, OST_WRITE,
1640                                                   &body->oa.o_cksum);
1641                         if (rc < 0) {
1642                                 CDEBUG(D_PAGE, "failed to checksum, rc = %d\n",
1643                                        rc);
1644                                 GOTO(out, rc);
1645                         }
1646                         CDEBUG(D_PAGE, "checksum at write origin: %x\n",
1647                                body->oa.o_cksum);
1648
1649                         /* save this in 'oa', too, for later checking */
1650                         oa->o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1651                         oa->o_flags |= obd_cksum_type_pack(obd_name,
1652                                                            cksum_type);
1653                 } else {
1654                         /* clear out the checksum flag, in case this is a
1655                          * resend but cl_checksum is no longer set. b=11238 */
1656                         oa->o_valid &= ~OBD_MD_FLCKSUM;
1657                 }
1658                 oa->o_cksum = body->oa.o_cksum;
1659                 /* 1 RC per niobuf */
1660                 req_capsule_set_size(pill, &RMF_RCS, RCL_SERVER,
1661                                      sizeof(__u32) * niocount);
1662         } else {
1663                 if (cli->cl_checksum &&
1664                     !sptlrpc_flavor_has_bulk(&req->rq_flvr)) {
1665                         if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0)
1666                                 body->oa.o_flags = 0;
1667                         body->oa.o_flags |= obd_cksum_type_pack(obd_name,
1668                                 cli->cl_cksum_type);
1669                         body->oa.o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1670                 }
1671
1672                 /* Client cksum has been already copied to wire obdo in previous
1673                  * lustre_set_wire_obdo(), and in the case a bulk-read is being
1674                  * resent due to cksum error, this will allow Server to
1675                  * check+dump pages on its side */
1676         }
1677         ptlrpc_request_set_replen(req);
1678
1679         aa = ptlrpc_req_async_args(aa, req);
1680         aa->aa_oa = oa;
1681         aa->aa_requested_nob = requested_nob;
1682         aa->aa_nio_count = niocount;
1683         aa->aa_page_count = page_count;
1684         aa->aa_resends = 0;
1685         aa->aa_ppga = pga;
1686         aa->aa_cli = cli;
1687         INIT_LIST_HEAD(&aa->aa_oaps);
1688
1689         *reqp = req;
1690         niobuf = req_capsule_client_get(pill, &RMF_NIOBUF_REMOTE);
1691         CDEBUG(D_RPCTRACE, "brw rpc %p - object "DOSTID" offset %lld<>%lld\n",
1692                 req, POSTID(&oa->o_oi), niobuf[0].rnb_offset,
1693                 niobuf[niocount - 1].rnb_offset + niobuf[niocount - 1].rnb_len);
1694         RETURN(0);
1695
1696  out:
1697         ptlrpc_req_finished(req);
1698         RETURN(rc);
1699 }
1700
1701 char dbgcksum_file_name[PATH_MAX];
1702
1703 static void dump_all_bulk_pages(struct obdo *oa, __u32 page_count,
1704                                 struct brw_page **pga, __u32 server_cksum,
1705                                 __u32 client_cksum)
1706 {
1707         struct file *filp;
1708         int rc, i;
1709         unsigned int len;
1710         char *buf;
1711
1712         /* will only keep dump of pages on first error for the same range in
1713          * file/fid, not during the resends/retries. */
1714         snprintf(dbgcksum_file_name, sizeof(dbgcksum_file_name),
1715                  "%s-checksum_dump-osc-"DFID":[%llu-%llu]-%x-%x",
1716                  (strncmp(libcfs_debug_file_path_arr, "NONE", 4) != 0 ?
1717                   libcfs_debug_file_path_arr :
1718                   LIBCFS_DEBUG_FILE_PATH_DEFAULT),
1719                  oa->o_valid & OBD_MD_FLFID ? oa->o_parent_seq : 0ULL,
1720                  oa->o_valid & OBD_MD_FLFID ? oa->o_parent_oid : 0,
1721                  oa->o_valid & OBD_MD_FLFID ? oa->o_parent_ver : 0,
1722                  pga[0]->off,
1723                  pga[page_count-1]->off + pga[page_count-1]->count - 1,
1724                  client_cksum, server_cksum);
1725         filp = filp_open(dbgcksum_file_name,
1726                          O_CREAT | O_EXCL | O_WRONLY | O_LARGEFILE, 0600);
1727         if (IS_ERR(filp)) {
1728                 rc = PTR_ERR(filp);
1729                 if (rc == -EEXIST)
1730                         CDEBUG(D_INFO, "%s: can't open to dump pages with "
1731                                "checksum error: rc = %d\n", dbgcksum_file_name,
1732                                rc);
1733                 else
1734                         CERROR("%s: can't open to dump pages with checksum "
1735                                "error: rc = %d\n", dbgcksum_file_name, rc);
1736                 return;
1737         }
1738
1739         for (i = 0; i < page_count; i++) {
1740                 len = pga[i]->count;
1741                 buf = kmap(pga[i]->pg);
1742                 while (len != 0) {
1743                         rc = cfs_kernel_write(filp, buf, len, &filp->f_pos);
1744                         if (rc < 0) {
1745                                 CERROR("%s: wanted to write %u but got %d "
1746                                        "error\n", dbgcksum_file_name, len, rc);
1747                                 break;
1748                         }
1749                         len -= rc;
1750                         buf += rc;
1751                         CDEBUG(D_INFO, "%s: wrote %d bytes\n",
1752                                dbgcksum_file_name, rc);
1753                 }
1754                 kunmap(pga[i]->pg);
1755         }
1756
1757         rc = vfs_fsync_range(filp, 0, LLONG_MAX, 1);
1758         if (rc)
1759                 CERROR("%s: sync returns %d\n", dbgcksum_file_name, rc);
1760         filp_close(filp, NULL);
1761 }
1762
1763 static int
1764 check_write_checksum(struct obdo *oa, const struct lnet_process_id *peer,
1765                      __u32 client_cksum, __u32 server_cksum,
1766                      struct osc_brw_async_args *aa)
1767 {
1768         const char *obd_name = aa->aa_cli->cl_import->imp_obd->obd_name;
1769         enum cksum_types cksum_type;
1770         obd_dif_csum_fn *fn = NULL;
1771         int sector_size = 0;
1772         __u32 new_cksum;
1773         char *msg;
1774         int rc;
1775
1776         if (server_cksum == client_cksum) {
1777                 CDEBUG(D_PAGE, "checksum %x confirmed\n", client_cksum);
1778                 return 0;
1779         }
1780
1781         if (aa->aa_cli->cl_checksum_dump)
1782                 dump_all_bulk_pages(oa, aa->aa_page_count, aa->aa_ppga,
1783                                     server_cksum, client_cksum);
1784
1785         cksum_type = obd_cksum_type_unpack(oa->o_valid & OBD_MD_FLFLAGS ?
1786                                            oa->o_flags : 0);
1787
1788         switch (cksum_type) {
1789         case OBD_CKSUM_T10IP512:
1790                 fn = obd_dif_ip_fn;
1791                 sector_size = 512;
1792                 break;
1793         case OBD_CKSUM_T10IP4K:
1794                 fn = obd_dif_ip_fn;
1795                 sector_size = 4096;
1796                 break;
1797         case OBD_CKSUM_T10CRC512:
1798                 fn = obd_dif_crc_fn;
1799                 sector_size = 512;
1800                 break;
1801         case OBD_CKSUM_T10CRC4K:
1802                 fn = obd_dif_crc_fn;
1803                 sector_size = 4096;
1804                 break;
1805         default:
1806                 break;
1807         }
1808
1809         if (fn)
1810                 rc = osc_checksum_bulk_t10pi(obd_name, aa->aa_requested_nob,
1811                                              aa->aa_page_count, aa->aa_ppga,
1812                                              OST_WRITE, fn, sector_size,
1813                                              &new_cksum);
1814         else
1815                 rc = osc_checksum_bulk(aa->aa_requested_nob, aa->aa_page_count,
1816                                        aa->aa_ppga, OST_WRITE, cksum_type,
1817                                        &new_cksum);
1818
1819         if (rc < 0)
1820                 msg = "failed to calculate the client write checksum";
1821         else if (cksum_type != obd_cksum_type_unpack(aa->aa_oa->o_flags))
1822                 msg = "the server did not use the checksum type specified in "
1823                       "the original request - likely a protocol problem";
1824         else if (new_cksum == server_cksum)
1825                 msg = "changed on the client after we checksummed it - "
1826                       "likely false positive due to mmap IO (bug 11742)";
1827         else if (new_cksum == client_cksum)
1828                 msg = "changed in transit before arrival at OST";
1829         else
1830                 msg = "changed in transit AND doesn't match the original - "
1831                       "likely false positive due to mmap IO (bug 11742)";
1832
1833         LCONSOLE_ERROR_MSG(0x132, "%s: BAD WRITE CHECKSUM: %s: from %s inode "
1834                            DFID " object "DOSTID" extent [%llu-%llu], original "
1835                            "client csum %x (type %x), server csum %x (type %x),"
1836                            " client csum now %x\n",
1837                            obd_name, msg, libcfs_nid2str(peer->nid),
1838                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_seq : (__u64)0,
1839                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_oid : 0,
1840                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_ver : 0,
1841                            POSTID(&oa->o_oi), aa->aa_ppga[0]->off,
1842                            aa->aa_ppga[aa->aa_page_count - 1]->off +
1843                                 aa->aa_ppga[aa->aa_page_count-1]->count - 1,
1844                            client_cksum,
1845                            obd_cksum_type_unpack(aa->aa_oa->o_flags),
1846                            server_cksum, cksum_type, new_cksum);
1847         return 1;
1848 }
1849
1850 /* Note rc enters this function as number of bytes transferred */
1851 static int osc_brw_fini_request(struct ptlrpc_request *req, int rc)
1852 {
1853         struct osc_brw_async_args *aa = (void *)&req->rq_async_args;
1854         struct client_obd *cli = aa->aa_cli;
1855         const char *obd_name = cli->cl_import->imp_obd->obd_name;
1856         const struct lnet_process_id *peer =
1857                 &req->rq_import->imp_connection->c_peer;
1858         struct ost_body *body;
1859         u32 client_cksum = 0;
1860         struct inode *inode;
1861
1862         ENTRY;
1863
1864         if (rc < 0 && rc != -EDQUOT) {
1865                 DEBUG_REQ(D_INFO, req, "Failed request: rc = %d", rc);
1866                 RETURN(rc);
1867         }
1868
1869         LASSERTF(req->rq_repmsg != NULL, "rc = %d\n", rc);
1870         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
1871         if (body == NULL) {
1872                 DEBUG_REQ(D_INFO, req, "cannot unpack body");
1873                 RETURN(-EPROTO);
1874         }
1875
1876         /* set/clear over quota flag for a uid/gid/projid */
1877         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE &&
1878             body->oa.o_valid & (OBD_MD_FLALLQUOTA)) {
1879                 unsigned qid[LL_MAXQUOTAS] = {
1880                                          body->oa.o_uid, body->oa.o_gid,
1881                                          body->oa.o_projid };
1882                 CDEBUG(D_QUOTA,
1883                        "setdq for [%u %u %u] with valid %#llx, flags %x\n",
1884                        body->oa.o_uid, body->oa.o_gid, body->oa.o_projid,
1885                        body->oa.o_valid, body->oa.o_flags);
1886                        osc_quota_setdq(cli, req->rq_xid, qid, body->oa.o_valid,
1887                                        body->oa.o_flags);
1888         }
1889
1890         osc_update_grant(cli, body);
1891
1892         if (rc < 0)
1893                 RETURN(rc);
1894
1895         if (aa->aa_oa->o_valid & OBD_MD_FLCKSUM)
1896                 client_cksum = aa->aa_oa->o_cksum; /* save for later */
1897
1898         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE) {
1899                 if (rc > 0) {
1900                         CERROR("%s: unexpected positive size %d\n",
1901                                obd_name, rc);
1902                         RETURN(-EPROTO);
1903                 }
1904
1905                 if (req->rq_bulk != NULL &&
1906                     sptlrpc_cli_unwrap_bulk_write(req, req->rq_bulk))
1907                         RETURN(-EAGAIN);
1908
1909                 if ((aa->aa_oa->o_valid & OBD_MD_FLCKSUM) && client_cksum &&
1910                     check_write_checksum(&body->oa, peer, client_cksum,
1911                                          body->oa.o_cksum, aa))
1912                         RETURN(-EAGAIN);
1913
1914                 rc = check_write_rcs(req, aa->aa_requested_nob,
1915                                      aa->aa_nio_count, aa->aa_page_count,
1916                                      aa->aa_ppga);
1917                 GOTO(out, rc);
1918         }
1919
1920         /* The rest of this function executes only for OST_READs */
1921
1922         if (req->rq_bulk == NULL) {
1923                 rc = req_capsule_get_size(&req->rq_pill, &RMF_SHORT_IO,
1924                                           RCL_SERVER);
1925                 LASSERT(rc == req->rq_status);
1926         } else {
1927                 /* if unwrap_bulk failed, return -EAGAIN to retry */
1928                 rc = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk, rc);
1929         }
1930         if (rc < 0)
1931                 GOTO(out, rc = -EAGAIN);
1932
1933         if (rc > aa->aa_requested_nob) {
1934                 CERROR("%s: unexpected size %d, requested %d\n", obd_name,
1935                        rc, aa->aa_requested_nob);
1936                 RETURN(-EPROTO);
1937         }
1938
1939         if (req->rq_bulk != NULL && rc != req->rq_bulk->bd_nob_transferred) {
1940                 CERROR("%s: unexpected size %d, transferred %d\n", obd_name,
1941                        rc, req->rq_bulk->bd_nob_transferred);
1942                 RETURN(-EPROTO);
1943         }
1944
1945         if (req->rq_bulk == NULL) {
1946                 /* short io */
1947                 int nob, pg_count, i = 0;
1948                 unsigned char *buf;
1949
1950                 CDEBUG(D_CACHE, "Using short io read, size %d\n", rc);
1951                 pg_count = aa->aa_page_count;
1952                 buf = req_capsule_server_sized_get(&req->rq_pill, &RMF_SHORT_IO,
1953                                                    rc);
1954                 nob = rc;
1955                 while (nob > 0 && pg_count > 0) {
1956                         unsigned char *ptr;
1957                         int count = aa->aa_ppga[i]->count > nob ?
1958                                     nob : aa->aa_ppga[i]->count;
1959
1960                         CDEBUG(D_CACHE, "page %p count %d\n",
1961                                aa->aa_ppga[i]->pg, count);
1962                         ptr = kmap_atomic(aa->aa_ppga[i]->pg);
1963                         memcpy(ptr + (aa->aa_ppga[i]->off & ~PAGE_MASK), buf,
1964                                count);
1965                         kunmap_atomic((void *) ptr);
1966
1967                         buf += count;
1968                         nob -= count;
1969                         i++;
1970                         pg_count--;
1971                 }
1972         }
1973
1974         if (rc < aa->aa_requested_nob)
1975                 handle_short_read(rc, aa->aa_page_count, aa->aa_ppga);
1976
1977         if (body->oa.o_valid & OBD_MD_FLCKSUM) {
1978                 static int cksum_counter;
1979                 u32        server_cksum = body->oa.o_cksum;
1980                 char      *via = "";
1981                 char      *router = "";
1982                 enum cksum_types cksum_type;
1983                 u32 o_flags = body->oa.o_valid & OBD_MD_FLFLAGS ?
1984                         body->oa.o_flags : 0;
1985
1986                 cksum_type = obd_cksum_type_unpack(o_flags);
1987                 rc = osc_checksum_bulk_rw(obd_name, cksum_type, rc,
1988                                           aa->aa_page_count, aa->aa_ppga,
1989                                           OST_READ, &client_cksum);
1990                 if (rc < 0)
1991                         GOTO(out, rc);
1992
1993                 if (req->rq_bulk != NULL &&
1994                     peer->nid != req->rq_bulk->bd_sender) {
1995                         via = " via ";
1996                         router = libcfs_nid2str(req->rq_bulk->bd_sender);
1997                 }
1998
1999                 if (server_cksum != client_cksum) {
2000                         struct ost_body *clbody;
2001                         u32 page_count = aa->aa_page_count;
2002
2003                         clbody = req_capsule_client_get(&req->rq_pill,
2004                                                         &RMF_OST_BODY);
2005                         if (cli->cl_checksum_dump)
2006                                 dump_all_bulk_pages(&clbody->oa, page_count,
2007                                                     aa->aa_ppga, server_cksum,
2008                                                     client_cksum);
2009
2010                         LCONSOLE_ERROR_MSG(0x133, "%s: BAD READ CHECKSUM: from "
2011                                            "%s%s%s inode "DFID" object "DOSTID
2012                                            " extent [%llu-%llu], client %x, "
2013                                            "server %x, cksum_type %x\n",
2014                                            obd_name,
2015                                            libcfs_nid2str(peer->nid),
2016                                            via, router,
2017                                            clbody->oa.o_valid & OBD_MD_FLFID ?
2018                                                 clbody->oa.o_parent_seq : 0ULL,
2019                                            clbody->oa.o_valid & OBD_MD_FLFID ?
2020                                                 clbody->oa.o_parent_oid : 0,
2021                                            clbody->oa.o_valid & OBD_MD_FLFID ?
2022                                                 clbody->oa.o_parent_ver : 0,
2023                                            POSTID(&body->oa.o_oi),
2024                                            aa->aa_ppga[0]->off,
2025                                            aa->aa_ppga[page_count-1]->off +
2026                                            aa->aa_ppga[page_count-1]->count - 1,
2027                                            client_cksum, server_cksum,
2028                                            cksum_type);
2029                         cksum_counter = 0;
2030                         aa->aa_oa->o_cksum = client_cksum;
2031                         rc = -EAGAIN;
2032                 } else {
2033                         cksum_counter++;
2034                         CDEBUG(D_PAGE, "checksum %x confirmed\n", client_cksum);
2035                         rc = 0;
2036                 }
2037         } else if (unlikely(client_cksum)) {
2038                 static int cksum_missed;
2039
2040                 cksum_missed++;
2041                 if ((cksum_missed & (-cksum_missed)) == cksum_missed)
2042                         CERROR("%s: checksum %u requested from %s but not sent\n",
2043                                obd_name, cksum_missed,
2044                                libcfs_nid2str(peer->nid));
2045         } else {
2046                 rc = 0;
2047         }
2048
2049         inode = page2inode(aa->aa_ppga[0]->pg);
2050         if (inode && IS_ENCRYPTED(inode)) {
2051                 int idx;
2052
2053                 if (!llcrypt_has_encryption_key(inode)) {
2054                         CDEBUG(D_SEC, "no enc key for ino %lu\n", inode->i_ino);
2055                         GOTO(out, rc);
2056                 }
2057                 for (idx = 0; idx < aa->aa_page_count; idx++) {
2058                         struct brw_page *pg = aa->aa_ppga[idx];
2059
2060                         /* do not decrypt if page is all 0s */
2061                         if (memchr_inv(page_address(pg->pg), 0,
2062                                        PAGE_SIZE) == NULL) {
2063                                 /* if page is empty forward info to upper layers
2064                                  * (ll_io_zero_page) by clearing PagePrivate2
2065                                  */
2066                                 ClearPagePrivate2(pg->pg);
2067                                 continue;
2068                         }
2069
2070                         rc = llcrypt_decrypt_pagecache_blocks(pg->pg,
2071                                                               PAGE_SIZE, 0);
2072                         if (rc)
2073                                 GOTO(out, rc);
2074                 }
2075         }
2076
2077 out:
2078         if (rc >= 0)
2079                 lustre_get_wire_obdo(&req->rq_import->imp_connect_data,
2080                                      aa->aa_oa, &body->oa);
2081
2082         RETURN(rc);
2083 }
2084
2085 static int osc_brw_redo_request(struct ptlrpc_request *request,
2086                                 struct osc_brw_async_args *aa, int rc)
2087 {
2088         struct ptlrpc_request *new_req;
2089         struct osc_brw_async_args *new_aa;
2090         struct osc_async_page *oap;
2091         ENTRY;
2092
2093         /* The below message is checked in replay-ost-single.sh test_8ae*/
2094         DEBUG_REQ(rc == -EINPROGRESS ? D_RPCTRACE : D_ERROR, request,
2095                   "redo for recoverable error %d", rc);
2096
2097         rc = osc_brw_prep_request(lustre_msg_get_opc(request->rq_reqmsg) ==
2098                                 OST_WRITE ? OBD_BRW_WRITE : OBD_BRW_READ,
2099                                   aa->aa_cli, aa->aa_oa, aa->aa_page_count,
2100                                   aa->aa_ppga, &new_req, 1);
2101         if (rc)
2102                 RETURN(rc);
2103
2104         list_for_each_entry(oap, &aa->aa_oaps, oap_rpc_item) {
2105                 if (oap->oap_request != NULL) {
2106                         LASSERTF(request == oap->oap_request,
2107                                  "request %p != oap_request %p\n",
2108                                  request, oap->oap_request);
2109                 }
2110         }
2111         /*
2112          * New request takes over pga and oaps from old request.
2113          * Note that copying a list_head doesn't work, need to move it...
2114          */
2115         aa->aa_resends++;
2116         new_req->rq_interpret_reply = request->rq_interpret_reply;
2117         new_req->rq_async_args = request->rq_async_args;
2118         new_req->rq_commit_cb = request->rq_commit_cb;
2119         /* cap resend delay to the current request timeout, this is similar to
2120          * what ptlrpc does (see after_reply()) */
2121         if (aa->aa_resends > new_req->rq_timeout)
2122                 new_req->rq_sent = ktime_get_real_seconds() + new_req->rq_timeout;
2123         else
2124                 new_req->rq_sent = ktime_get_real_seconds() + aa->aa_resends;
2125         new_req->rq_generation_set = 1;
2126         new_req->rq_import_generation = request->rq_import_generation;
2127
2128         new_aa = ptlrpc_req_async_args(new_aa, new_req);
2129
2130         INIT_LIST_HEAD(&new_aa->aa_oaps);
2131         list_splice_init(&aa->aa_oaps, &new_aa->aa_oaps);
2132         INIT_LIST_HEAD(&new_aa->aa_exts);
2133         list_splice_init(&aa->aa_exts, &new_aa->aa_exts);
2134         new_aa->aa_resends = aa->aa_resends;
2135
2136         list_for_each_entry(oap, &new_aa->aa_oaps, oap_rpc_item) {
2137                 if (oap->oap_request) {
2138                         ptlrpc_req_finished(oap->oap_request);
2139                         oap->oap_request = ptlrpc_request_addref(new_req);
2140                 }
2141         }
2142
2143         /* XXX: This code will run into problem if we're going to support
2144          * to add a series of BRW RPCs into a self-defined ptlrpc_request_set
2145          * and wait for all of them to be finished. We should inherit request
2146          * set from old request. */
2147         ptlrpcd_add_req(new_req);
2148
2149         DEBUG_REQ(D_INFO, new_req, "new request");
2150         RETURN(0);
2151 }
2152
2153 /*
2154  * ugh, we want disk allocation on the target to happen in offset order.  we'll
2155  * follow sedgewicks advice and stick to the dead simple shellsort -- it'll do
2156  * fine for our small page arrays and doesn't require allocation.  its an
2157  * insertion sort that swaps elements that are strides apart, shrinking the
2158  * stride down until its '1' and the array is sorted.
2159  */
2160 static void sort_brw_pages(struct brw_page **array, int num)
2161 {
2162         int stride, i, j;
2163         struct brw_page *tmp;
2164
2165         if (num == 1)
2166                 return;
2167         for (stride = 1; stride < num ; stride = (stride * 3) + 1)
2168                 ;
2169
2170         do {
2171                 stride /= 3;
2172                 for (i = stride ; i < num ; i++) {
2173                         tmp = array[i];
2174                         j = i;
2175                         while (j >= stride && array[j - stride]->off > tmp->off) {
2176                                 array[j] = array[j - stride];
2177                                 j -= stride;
2178                         }
2179                         array[j] = tmp;
2180                 }
2181         } while (stride > 1);
2182 }
2183
2184 static void osc_release_ppga(struct brw_page **ppga, size_t count)
2185 {
2186         LASSERT(ppga != NULL);
2187         OBD_FREE_PTR_ARRAY(ppga, count);
2188 }
2189
2190 static int brw_interpret(const struct lu_env *env,
2191                          struct ptlrpc_request *req, void *args, int rc)
2192 {
2193         struct osc_brw_async_args *aa = args;
2194         struct osc_extent *ext;
2195         struct osc_extent *tmp;
2196         struct client_obd *cli = aa->aa_cli;
2197         unsigned long transferred = 0;
2198
2199         ENTRY;
2200
2201         rc = osc_brw_fini_request(req, rc);
2202         CDEBUG(D_INODE, "request %p aa %p rc %d\n", req, aa, rc);
2203
2204         /* restore clear text pages */
2205         osc_release_bounce_pages(aa->aa_ppga, aa->aa_page_count);
2206
2207         /*
2208          * When server returns -EINPROGRESS, client should always retry
2209          * regardless of the number of times the bulk was resent already.
2210          */
2211         if (osc_recoverable_error(rc) && !req->rq_no_delay) {
2212                 if (req->rq_import_generation !=
2213                     req->rq_import->imp_generation) {
2214                         CDEBUG(D_HA, "%s: resend cross eviction for object: "
2215                                ""DOSTID", rc = %d.\n",
2216                                req->rq_import->imp_obd->obd_name,
2217                                POSTID(&aa->aa_oa->o_oi), rc);
2218                 } else if (rc == -EINPROGRESS ||
2219                     client_should_resend(aa->aa_resends, aa->aa_cli)) {
2220                         rc = osc_brw_redo_request(req, aa, rc);
2221                 } else {
2222                         CERROR("%s: too many resent retries for object: "
2223                                "%llu:%llu, rc = %d.\n",
2224                                req->rq_import->imp_obd->obd_name,
2225                                POSTID(&aa->aa_oa->o_oi), rc);
2226                 }
2227
2228                 if (rc == 0)
2229                         RETURN(0);
2230                 else if (rc == -EAGAIN || rc == -EINPROGRESS)
2231                         rc = -EIO;
2232         }
2233
2234         if (rc == 0) {
2235                 struct obdo *oa = aa->aa_oa;
2236                 struct cl_attr *attr = &osc_env_info(env)->oti_attr;
2237                 unsigned long valid = 0;
2238                 struct cl_object *obj;
2239                 struct osc_async_page *last;
2240
2241                 last = brw_page2oap(aa->aa_ppga[aa->aa_page_count - 1]);
2242                 obj = osc2cl(last->oap_obj);
2243
2244                 cl_object_attr_lock(obj);
2245                 if (oa->o_valid & OBD_MD_FLBLOCKS) {
2246                         attr->cat_blocks = oa->o_blocks;
2247                         valid |= CAT_BLOCKS;
2248                 }
2249                 if (oa->o_valid & OBD_MD_FLMTIME) {
2250                         attr->cat_mtime = oa->o_mtime;
2251                         valid |= CAT_MTIME;
2252                 }
2253                 if (oa->o_valid & OBD_MD_FLATIME) {
2254                         attr->cat_atime = oa->o_atime;
2255                         valid |= CAT_ATIME;
2256                 }
2257                 if (oa->o_valid & OBD_MD_FLCTIME) {
2258                         attr->cat_ctime = oa->o_ctime;
2259                         valid |= CAT_CTIME;
2260                 }
2261
2262                 if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE) {
2263                         struct lov_oinfo *loi = cl2osc(obj)->oo_oinfo;
2264                         loff_t last_off = last->oap_count + last->oap_obj_off +
2265                                 last->oap_page_off;
2266
2267                         /* Change file size if this is an out of quota or
2268                          * direct IO write and it extends the file size */
2269                         if (loi->loi_lvb.lvb_size < last_off) {
2270                                 attr->cat_size = last_off;
2271                                 valid |= CAT_SIZE;
2272                         }
2273                         /* Extend KMS if it's not a lockless write */
2274                         if (loi->loi_kms < last_off &&
2275                             oap2osc_page(last)->ops_srvlock == 0) {
2276                                 attr->cat_kms = last_off;
2277                                 valid |= CAT_KMS;
2278                         }
2279                 }
2280
2281                 if (valid != 0)
2282                         cl_object_attr_update(env, obj, attr, valid);
2283                 cl_object_attr_unlock(obj);
2284         }
2285         OBD_SLAB_FREE_PTR(aa->aa_oa, osc_obdo_kmem);
2286         aa->aa_oa = NULL;
2287
2288         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE && rc == 0)
2289                 osc_inc_unstable_pages(req);
2290
2291         list_for_each_entry_safe(ext, tmp, &aa->aa_exts, oe_link) {
2292                 list_del_init(&ext->oe_link);
2293                 osc_extent_finish(env, ext, 1,
2294                                   rc && req->rq_no_delay ? -EWOULDBLOCK : rc);
2295         }
2296         LASSERT(list_empty(&aa->aa_exts));
2297         LASSERT(list_empty(&aa->aa_oaps));
2298
2299         transferred = (req->rq_bulk == NULL ? /* short io */
2300                        aa->aa_requested_nob :
2301                        req->rq_bulk->bd_nob_transferred);
2302
2303         osc_release_ppga(aa->aa_ppga, aa->aa_page_count);
2304         ptlrpc_lprocfs_brw(req, transferred);
2305
2306         spin_lock(&cli->cl_loi_list_lock);
2307         /* We need to decrement before osc_ap_completion->osc_wake_cache_waiters
2308          * is called so we know whether to go to sync BRWs or wait for more
2309          * RPCs to complete */
2310         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE)
2311                 cli->cl_w_in_flight--;
2312         else
2313                 cli->cl_r_in_flight--;
2314         osc_wake_cache_waiters(cli);
2315         spin_unlock(&cli->cl_loi_list_lock);
2316
2317         osc_io_unplug(env, cli, NULL);
2318         RETURN(rc);
2319 }
2320
2321 static void brw_commit(struct ptlrpc_request *req)
2322 {
2323         /* If osc_inc_unstable_pages (via osc_extent_finish) races with
2324          * this called via the rq_commit_cb, I need to ensure
2325          * osc_dec_unstable_pages is still called. Otherwise unstable
2326          * pages may be leaked. */
2327         spin_lock(&req->rq_lock);
2328         if (likely(req->rq_unstable)) {
2329                 req->rq_unstable = 0;
2330                 spin_unlock(&req->rq_lock);
2331
2332                 osc_dec_unstable_pages(req);
2333         } else {
2334                 req->rq_committed = 1;
2335                 spin_unlock(&req->rq_lock);
2336         }
2337 }
2338
2339 /**
2340  * Build an RPC by the list of extent @ext_list. The caller must ensure
2341  * that the total pages in this list are NOT over max pages per RPC.
2342  * Extents in the list must be in OES_RPC state.
2343  */
2344 int osc_build_rpc(const struct lu_env *env, struct client_obd *cli,
2345                   struct list_head *ext_list, int cmd)
2346 {
2347         struct ptlrpc_request           *req = NULL;
2348         struct osc_extent               *ext;
2349         struct brw_page                 **pga = NULL;
2350         struct osc_brw_async_args       *aa = NULL;
2351         struct obdo                     *oa = NULL;
2352         struct osc_async_page           *oap;
2353         struct osc_object               *obj = NULL;
2354         struct cl_req_attr              *crattr = NULL;
2355         loff_t                          starting_offset = OBD_OBJECT_EOF;
2356         loff_t                          ending_offset = 0;
2357         /* '1' for consistency with code that checks !mpflag to restore */
2358         int mpflag = 1;
2359         int                             mem_tight = 0;
2360         int                             page_count = 0;
2361         bool                            soft_sync = false;
2362         bool                            ndelay = false;
2363         int                             i;
2364         int                             grant = 0;
2365         int                             rc;
2366         __u32                           layout_version = 0;
2367         LIST_HEAD(rpc_list);
2368         struct ost_body                 *body;
2369         ENTRY;
2370         LASSERT(!list_empty(ext_list));
2371
2372         /* add pages into rpc_list to build BRW rpc */
2373         list_for_each_entry(ext, ext_list, oe_link) {
2374                 LASSERT(ext->oe_state == OES_RPC);
2375                 mem_tight |= ext->oe_memalloc;
2376                 grant += ext->oe_grants;
2377                 page_count += ext->oe_nr_pages;
2378                 layout_version = max(layout_version, ext->oe_layout_version);
2379                 if (obj == NULL)
2380                         obj = ext->oe_obj;
2381         }
2382
2383         soft_sync = osc_over_unstable_soft_limit(cli);
2384         if (mem_tight)
2385                 mpflag = memalloc_noreclaim_save();
2386
2387         OBD_ALLOC_PTR_ARRAY(pga, page_count);
2388         if (pga == NULL)
2389                 GOTO(out, rc = -ENOMEM);
2390
2391         OBD_SLAB_ALLOC_PTR_GFP(oa, osc_obdo_kmem, GFP_NOFS);
2392         if (oa == NULL)
2393                 GOTO(out, rc = -ENOMEM);
2394
2395         i = 0;
2396         list_for_each_entry(ext, ext_list, oe_link) {
2397                 list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) {
2398                         if (mem_tight)
2399                                 oap->oap_brw_flags |= OBD_BRW_MEMALLOC;
2400                         if (soft_sync)
2401                                 oap->oap_brw_flags |= OBD_BRW_SOFT_SYNC;
2402                         pga[i] = &oap->oap_brw_page;
2403                         pga[i]->off = oap->oap_obj_off + oap->oap_page_off;
2404                         i++;
2405
2406                         list_add_tail(&oap->oap_rpc_item, &rpc_list);
2407                         if (starting_offset == OBD_OBJECT_EOF ||
2408                             starting_offset > oap->oap_obj_off)
2409                                 starting_offset = oap->oap_obj_off;
2410                         else
2411                                 LASSERT(oap->oap_page_off == 0);
2412                         if (ending_offset < oap->oap_obj_off + oap->oap_count)
2413                                 ending_offset = oap->oap_obj_off +
2414                                                 oap->oap_count;
2415                         else
2416                                 LASSERT(oap->oap_page_off + oap->oap_count ==
2417                                         PAGE_SIZE);
2418                 }
2419                 if (ext->oe_ndelay)
2420                         ndelay = true;
2421         }
2422
2423         /* first page in the list */
2424         oap = list_entry(rpc_list.next, typeof(*oap), oap_rpc_item);
2425
2426         crattr = &osc_env_info(env)->oti_req_attr;
2427         memset(crattr, 0, sizeof(*crattr));
2428         crattr->cra_type = (cmd & OBD_BRW_WRITE) ? CRT_WRITE : CRT_READ;
2429         crattr->cra_flags = ~0ULL;
2430         crattr->cra_page = oap2cl_page(oap);
2431         crattr->cra_oa = oa;
2432         cl_req_attr_set(env, osc2cl(obj), crattr);
2433
2434         if (cmd == OBD_BRW_WRITE) {
2435                 oa->o_grant_used = grant;
2436                 if (layout_version > 0) {
2437                         CDEBUG(D_LAYOUT, DFID": write with layout version %u\n",
2438                                PFID(&oa->o_oi.oi_fid), layout_version);
2439
2440                         oa->o_layout_version = layout_version;
2441                         oa->o_valid |= OBD_MD_LAYOUT_VERSION;
2442                 }
2443         }
2444
2445         sort_brw_pages(pga, page_count);
2446         rc = osc_brw_prep_request(cmd, cli, oa, page_count, pga, &req, 0);
2447         if (rc != 0) {
2448                 CERROR("prep_req failed: %d\n", rc);
2449                 GOTO(out, rc);
2450         }
2451
2452         req->rq_commit_cb = brw_commit;
2453         req->rq_interpret_reply = brw_interpret;
2454         req->rq_memalloc = mem_tight != 0;
2455         oap->oap_request = ptlrpc_request_addref(req);
2456         if (ndelay) {
2457                 req->rq_no_resend = req->rq_no_delay = 1;
2458                 /* probably set a shorter timeout value.
2459                  * to handle ETIMEDOUT in brw_interpret() correctly. */
2460                 /* lustre_msg_set_timeout(req, req->rq_timeout / 2); */
2461         }
2462
2463         /* Need to update the timestamps after the request is built in case
2464          * we race with setattr (locally or in queue at OST).  If OST gets
2465          * later setattr before earlier BRW (as determined by the request xid),
2466          * the OST will not use BRW timestamps.  Sadly, there is no obvious
2467          * way to do this in a single call.  bug 10150 */
2468         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
2469         crattr->cra_oa = &body->oa;
2470         crattr->cra_flags = OBD_MD_FLMTIME | OBD_MD_FLCTIME | OBD_MD_FLATIME;
2471         cl_req_attr_set(env, osc2cl(obj), crattr);
2472         lustre_msg_set_jobid(req->rq_reqmsg, crattr->cra_jobid);
2473
2474         aa = ptlrpc_req_async_args(aa, req);
2475         INIT_LIST_HEAD(&aa->aa_oaps);
2476         list_splice_init(&rpc_list, &aa->aa_oaps);
2477         INIT_LIST_HEAD(&aa->aa_exts);
2478         list_splice_init(ext_list, &aa->aa_exts);
2479
2480         spin_lock(&cli->cl_loi_list_lock);
2481         starting_offset >>= PAGE_SHIFT;
2482         if (cmd == OBD_BRW_READ) {
2483                 cli->cl_r_in_flight++;
2484                 lprocfs_oh_tally_log2(&cli->cl_read_page_hist, page_count);
2485                 lprocfs_oh_tally(&cli->cl_read_rpc_hist, cli->cl_r_in_flight);
2486                 lprocfs_oh_tally_log2(&cli->cl_read_offset_hist,
2487                                       starting_offset + 1);
2488         } else {
2489                 cli->cl_w_in_flight++;
2490                 lprocfs_oh_tally_log2(&cli->cl_write_page_hist, page_count);
2491                 lprocfs_oh_tally(&cli->cl_write_rpc_hist, cli->cl_w_in_flight);
2492                 lprocfs_oh_tally_log2(&cli->cl_write_offset_hist,
2493                                       starting_offset + 1);
2494         }
2495         spin_unlock(&cli->cl_loi_list_lock);
2496
2497         DEBUG_REQ(D_INODE, req, "%d pages, aa %p, now %ur/%uw in flight",
2498                   page_count, aa, cli->cl_r_in_flight,
2499                   cli->cl_w_in_flight);
2500         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_DELAY_IO, cfs_fail_val);
2501
2502         ptlrpcd_add_req(req);
2503         rc = 0;
2504         EXIT;
2505
2506 out:
2507         if (mem_tight)
2508                 memalloc_noreclaim_restore(mpflag);
2509
2510         if (rc != 0) {
2511                 LASSERT(req == NULL);
2512
2513                 if (oa)
2514                         OBD_SLAB_FREE_PTR(oa, osc_obdo_kmem);
2515                 if (pga) {
2516                         osc_release_bounce_pages(pga, page_count);
2517                         osc_release_ppga(pga, page_count);
2518                 }
2519                 /* this should happen rarely and is pretty bad, it makes the
2520                  * pending list not follow the dirty order */
2521                 while (!list_empty(ext_list)) {
2522                         ext = list_entry(ext_list->next, struct osc_extent,
2523                                          oe_link);
2524                         list_del_init(&ext->oe_link);
2525                         osc_extent_finish(env, ext, 0, rc);
2526                 }
2527         }
2528         RETURN(rc);
2529 }
2530
2531 static int osc_set_lock_data(struct ldlm_lock *lock, void *data)
2532 {
2533         int set = 0;
2534
2535         LASSERT(lock != NULL);
2536
2537         lock_res_and_lock(lock);
2538
2539         if (lock->l_ast_data == NULL)
2540                 lock->l_ast_data = data;
2541         if (lock->l_ast_data == data)
2542                 set = 1;
2543
2544         unlock_res_and_lock(lock);
2545
2546         return set;
2547 }
2548
2549 int osc_enqueue_fini(struct ptlrpc_request *req, osc_enqueue_upcall_f upcall,
2550                      void *cookie, struct lustre_handle *lockh,
2551                      enum ldlm_mode mode, __u64 *flags, bool speculative,
2552                      int errcode)
2553 {
2554         bool intent = *flags & LDLM_FL_HAS_INTENT;
2555         int rc;
2556         ENTRY;
2557
2558         /* The request was created before ldlm_cli_enqueue call. */
2559         if (intent && errcode == ELDLM_LOCK_ABORTED) {
2560                 struct ldlm_reply *rep;
2561
2562                 rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
2563                 LASSERT(rep != NULL);
2564
2565                 rep->lock_policy_res1 =
2566                         ptlrpc_status_ntoh(rep->lock_policy_res1);
2567                 if (rep->lock_policy_res1)
2568                         errcode = rep->lock_policy_res1;
2569                 if (!speculative)
2570                         *flags |= LDLM_FL_LVB_READY;
2571         } else if (errcode == ELDLM_OK) {
2572                 *flags |= LDLM_FL_LVB_READY;
2573         }
2574
2575         /* Call the update callback. */
2576         rc = (*upcall)(cookie, lockh, errcode);
2577
2578         /* release the reference taken in ldlm_cli_enqueue() */
2579         if (errcode == ELDLM_LOCK_MATCHED)
2580                 errcode = ELDLM_OK;
2581         if (errcode == ELDLM_OK && lustre_handle_is_used(lockh))
2582                 ldlm_lock_decref(lockh, mode);
2583
2584         RETURN(rc);
2585 }
2586
2587 int osc_enqueue_interpret(const struct lu_env *env, struct ptlrpc_request *req,
2588                           void *args, int rc)
2589 {
2590         struct osc_enqueue_args *aa = args;
2591         struct ldlm_lock *lock;
2592         struct lustre_handle *lockh = &aa->oa_lockh;
2593         enum ldlm_mode mode = aa->oa_mode;
2594         struct ost_lvb *lvb = aa->oa_lvb;
2595         __u32 lvb_len = sizeof(*lvb);
2596         __u64 flags = 0;
2597
2598         ENTRY;
2599
2600         /* ldlm_cli_enqueue is holding a reference on the lock, so it must
2601          * be valid. */
2602         lock = ldlm_handle2lock(lockh);
2603         LASSERTF(lock != NULL,
2604                  "lockh %#llx, req %p, aa %p - client evicted?\n",
2605                  lockh->cookie, req, aa);
2606
2607         /* Take an additional reference so that a blocking AST that
2608          * ldlm_cli_enqueue_fini() might post for a failed lock, is guaranteed
2609          * to arrive after an upcall has been executed by
2610          * osc_enqueue_fini(). */
2611         ldlm_lock_addref(lockh, mode);
2612
2613         /* Let cl_lock_state_wait fail with -ERESTARTSYS to unuse sublocks. */
2614         OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_ENQUEUE_HANG, 2);
2615
2616         /* Let CP AST to grant the lock first. */
2617         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_ENQ_RACE, 1);
2618
2619         if (aa->oa_speculative) {
2620                 LASSERT(aa->oa_lvb == NULL);
2621                 LASSERT(aa->oa_flags == NULL);
2622                 aa->oa_flags = &flags;
2623         }
2624
2625         /* Complete obtaining the lock procedure. */
2626         rc = ldlm_cli_enqueue_fini(aa->oa_exp, req, aa->oa_type, 1,
2627                                    aa->oa_mode, aa->oa_flags, lvb, lvb_len,
2628                                    lockh, rc);
2629         /* Complete osc stuff. */
2630         rc = osc_enqueue_fini(req, aa->oa_upcall, aa->oa_cookie, lockh, mode,
2631                               aa->oa_flags, aa->oa_speculative, rc);
2632
2633         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_CANCEL_RACE, 10);
2634
2635         ldlm_lock_decref(lockh, mode);
2636         LDLM_LOCK_PUT(lock);
2637         RETURN(rc);
2638 }
2639
2640 /* When enqueuing asynchronously, locks are not ordered, we can obtain a lock
2641  * from the 2nd OSC before a lock from the 1st one. This does not deadlock with
2642  * other synchronous requests, however keeping some locks and trying to obtain
2643  * others may take a considerable amount of time in a case of ost failure; and
2644  * when other sync requests do not get released lock from a client, the client
2645  * is evicted from the cluster -- such scenarious make the life difficult, so
2646  * release locks just after they are obtained. */
2647 int osc_enqueue_base(struct obd_export *exp, struct ldlm_res_id *res_id,
2648                      __u64 *flags, union ldlm_policy_data *policy,
2649                      struct ost_lvb *lvb, osc_enqueue_upcall_f upcall,
2650                      void *cookie, struct ldlm_enqueue_info *einfo,
2651                      struct ptlrpc_request_set *rqset, int async,
2652                      bool speculative)
2653 {
2654         struct obd_device *obd = exp->exp_obd;
2655         struct lustre_handle lockh = { 0 };
2656         struct ptlrpc_request *req = NULL;
2657         int intent = *flags & LDLM_FL_HAS_INTENT;
2658         __u64 match_flags = *flags;
2659         enum ldlm_mode mode;
2660         int rc;
2661         ENTRY;
2662
2663         /* Filesystem lock extents are extended to page boundaries so that
2664          * dealing with the page cache is a little smoother.  */
2665         policy->l_extent.start -= policy->l_extent.start & ~PAGE_MASK;
2666         policy->l_extent.end |= ~PAGE_MASK;
2667
2668         /* Next, search for already existing extent locks that will cover us */
2669         /* If we're trying to read, we also search for an existing PW lock.  The
2670          * VFS and page cache already protect us locally, so lots of readers/
2671          * writers can share a single PW lock.
2672          *
2673          * There are problems with conversion deadlocks, so instead of
2674          * converting a read lock to a write lock, we'll just enqueue a new
2675          * one.
2676          *
2677          * At some point we should cancel the read lock instead of making them
2678          * send us a blocking callback, but there are problems with canceling
2679          * locks out from other users right now, too. */
2680         mode = einfo->ei_mode;
2681         if (einfo->ei_mode == LCK_PR)
2682                 mode |= LCK_PW;
2683         /* Normal lock requests must wait for the LVB to be ready before
2684          * matching a lock; speculative lock requests do not need to,
2685          * because they will not actually use the lock. */
2686         if (!speculative)
2687                 match_flags |= LDLM_FL_LVB_READY;
2688         if (intent != 0)
2689                 match_flags |= LDLM_FL_BLOCK_GRANTED;
2690         mode = ldlm_lock_match(obd->obd_namespace, match_flags, res_id,
2691                                einfo->ei_type, policy, mode, &lockh, 0);
2692         if (mode) {
2693                 struct ldlm_lock *matched;
2694
2695                 if (*flags & LDLM_FL_TEST_LOCK)
2696                         RETURN(ELDLM_OK);
2697
2698                 matched = ldlm_handle2lock(&lockh);
2699                 if (speculative) {
2700                         /* This DLM lock request is speculative, and does not
2701                          * have an associated IO request. Therefore if there
2702                          * is already a DLM lock, it wll just inform the
2703                          * caller to cancel the request for this stripe.*/
2704                         lock_res_and_lock(matched);
2705                         if (ldlm_extent_equal(&policy->l_extent,
2706                             &matched->l_policy_data.l_extent))
2707                                 rc = -EEXIST;
2708                         else
2709                                 rc = -ECANCELED;
2710                         unlock_res_and_lock(matched);
2711
2712                         ldlm_lock_decref(&lockh, mode);
2713                         LDLM_LOCK_PUT(matched);
2714                         RETURN(rc);
2715                 } else if (osc_set_lock_data(matched, einfo->ei_cbdata)) {
2716                         *flags |= LDLM_FL_LVB_READY;
2717
2718                         /* We already have a lock, and it's referenced. */
2719                         (*upcall)(cookie, &lockh, ELDLM_LOCK_MATCHED);
2720
2721                         ldlm_lock_decref(&lockh, mode);
2722                         LDLM_LOCK_PUT(matched);
2723                         RETURN(ELDLM_OK);
2724                 } else {
2725                         ldlm_lock_decref(&lockh, mode);
2726                         LDLM_LOCK_PUT(matched);
2727                 }
2728         }
2729
2730         if (*flags & (LDLM_FL_TEST_LOCK | LDLM_FL_MATCH_LOCK))
2731                 RETURN(-ENOLCK);
2732
2733         if (intent) {
2734                 req = ptlrpc_request_alloc(class_exp2cliimp(exp),
2735                                            &RQF_LDLM_ENQUEUE_LVB);
2736                 if (req == NULL)
2737                         RETURN(-ENOMEM);
2738
2739                 rc = ldlm_prep_enqueue_req(exp, req, NULL, 0);
2740                 if (rc) {
2741                         ptlrpc_request_free(req);
2742                         RETURN(rc);
2743                 }
2744
2745                 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
2746                                      sizeof *lvb);
2747                 ptlrpc_request_set_replen(req);
2748         }
2749
2750         /* users of osc_enqueue() can pass this flag for ldlm_lock_match() */
2751         *flags &= ~LDLM_FL_BLOCK_GRANTED;
2752
2753         rc = ldlm_cli_enqueue(exp, &req, einfo, res_id, policy, flags, lvb,
2754                               sizeof(*lvb), LVB_T_OST, &lockh, async);
2755         if (async) {
2756                 if (!rc) {
2757                         struct osc_enqueue_args *aa;
2758                         aa = ptlrpc_req_async_args(aa, req);
2759                         aa->oa_exp         = exp;
2760                         aa->oa_mode        = einfo->ei_mode;
2761                         aa->oa_type        = einfo->ei_type;
2762                         lustre_handle_copy(&aa->oa_lockh, &lockh);
2763                         aa->oa_upcall      = upcall;
2764                         aa->oa_cookie      = cookie;
2765                         aa->oa_speculative = speculative;
2766                         if (!speculative) {
2767                                 aa->oa_flags  = flags;
2768                                 aa->oa_lvb    = lvb;
2769                         } else {
2770                                 /* speculative locks are essentially to enqueue
2771                                  * a DLM lock  in advance, so we don't care
2772                                  * about the result of the enqueue. */
2773                                 aa->oa_lvb    = NULL;
2774                                 aa->oa_flags  = NULL;
2775                         }
2776
2777                         req->rq_interpret_reply = osc_enqueue_interpret;
2778                         ptlrpc_set_add_req(rqset, req);
2779                 } else if (intent) {
2780                         ptlrpc_req_finished(req);
2781                 }
2782                 RETURN(rc);
2783         }
2784
2785         rc = osc_enqueue_fini(req, upcall, cookie, &lockh, einfo->ei_mode,
2786                               flags, speculative, rc);
2787         if (intent)
2788                 ptlrpc_req_finished(req);
2789
2790         RETURN(rc);
2791 }
2792
2793 int osc_match_base(const struct lu_env *env, struct obd_export *exp,
2794                    struct ldlm_res_id *res_id, enum ldlm_type type,
2795                    union ldlm_policy_data *policy, enum ldlm_mode mode,
2796                    __u64 *flags, struct osc_object *obj,
2797                    struct lustre_handle *lockh, int unref)
2798 {
2799         struct obd_device *obd = exp->exp_obd;
2800         __u64 lflags = *flags;
2801         enum ldlm_mode rc;
2802         ENTRY;
2803
2804         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_MATCH))
2805                 RETURN(-EIO);
2806
2807         /* Filesystem lock extents are extended to page boundaries so that
2808          * dealing with the page cache is a little smoother */
2809         policy->l_extent.start -= policy->l_extent.start & ~PAGE_MASK;
2810         policy->l_extent.end |= ~PAGE_MASK;
2811
2812         /* Next, search for already existing extent locks that will cover us */
2813         /* If we're trying to read, we also search for an existing PW lock.  The
2814          * VFS and page cache already protect us locally, so lots of readers/
2815          * writers can share a single PW lock. */
2816         rc = mode;
2817         if (mode == LCK_PR)
2818                 rc |= LCK_PW;
2819         rc = ldlm_lock_match(obd->obd_namespace, lflags,
2820                              res_id, type, policy, rc, lockh, unref);
2821         if (rc == 0 || lflags & LDLM_FL_TEST_LOCK)
2822                 RETURN(rc);
2823
2824         if (obj != NULL) {
2825                 struct ldlm_lock *lock = ldlm_handle2lock(lockh);
2826
2827                 LASSERT(lock != NULL);
2828                 if (osc_set_lock_data(lock, obj)) {
2829                         lock_res_and_lock(lock);
2830                         if (!ldlm_is_lvb_cached(lock)) {
2831                                 LASSERT(lock->l_ast_data == obj);
2832                                 osc_lock_lvb_update(env, obj, lock, NULL);
2833                                 ldlm_set_lvb_cached(lock);
2834                         }
2835                         unlock_res_and_lock(lock);
2836                 } else {
2837                         ldlm_lock_decref(lockh, rc);
2838                         rc = 0;
2839                 }
2840                 LDLM_LOCK_PUT(lock);
2841         }
2842         RETURN(rc);
2843 }
2844
2845 static int osc_statfs_interpret(const struct lu_env *env,
2846                                 struct ptlrpc_request *req, void *args, int rc)
2847 {
2848         struct osc_async_args *aa = args;
2849         struct obd_statfs *msfs;
2850
2851         ENTRY;
2852         if (rc == -EBADR)
2853                 /*
2854                  * The request has in fact never been sent due to issues at
2855                  * a higher level (LOV).  Exit immediately since the caller
2856                  * is aware of the problem and takes care of the clean up.
2857                  */
2858                 RETURN(rc);
2859
2860         if ((rc == -ENOTCONN || rc == -EAGAIN) &&
2861             (aa->aa_oi->oi_flags & OBD_STATFS_NODELAY))
2862                 GOTO(out, rc = 0);
2863
2864         if (rc != 0)
2865                 GOTO(out, rc);
2866
2867         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
2868         if (msfs == NULL)
2869                 GOTO(out, rc = -EPROTO);
2870
2871         *aa->aa_oi->oi_osfs = *msfs;
2872 out:
2873         rc = aa->aa_oi->oi_cb_up(aa->aa_oi, rc);
2874
2875         RETURN(rc);
2876 }
2877
2878 static int osc_statfs_async(struct obd_export *exp,
2879                             struct obd_info *oinfo, time64_t max_age,
2880                             struct ptlrpc_request_set *rqset)
2881 {
2882         struct obd_device     *obd = class_exp2obd(exp);
2883         struct ptlrpc_request *req;
2884         struct osc_async_args *aa;
2885         int rc;
2886         ENTRY;
2887
2888         if (obd->obd_osfs_age >= max_age) {
2889                 CDEBUG(D_SUPER,
2890                        "%s: use %p cache blocks %llu/%llu objects %llu/%llu\n",
2891                        obd->obd_name, &obd->obd_osfs,
2892                        obd->obd_osfs.os_bavail, obd->obd_osfs.os_blocks,
2893                        obd->obd_osfs.os_ffree, obd->obd_osfs.os_files);
2894                 spin_lock(&obd->obd_osfs_lock);
2895                 memcpy(oinfo->oi_osfs, &obd->obd_osfs, sizeof(*oinfo->oi_osfs));
2896                 spin_unlock(&obd->obd_osfs_lock);
2897                 oinfo->oi_flags |= OBD_STATFS_FROM_CACHE;
2898                 if (oinfo->oi_cb_up)
2899                         oinfo->oi_cb_up(oinfo, 0);
2900
2901                 RETURN(0);
2902         }
2903
2904         /* We could possibly pass max_age in the request (as an absolute
2905          * timestamp or a "seconds.usec ago") so the target can avoid doing
2906          * extra calls into the filesystem if that isn't necessary (e.g.
2907          * during mount that would help a bit).  Having relative timestamps
2908          * is not so great if request processing is slow, while absolute
2909          * timestamps are not ideal because they need time synchronization. */
2910         req = ptlrpc_request_alloc(obd->u.cli.cl_import, &RQF_OST_STATFS);
2911         if (req == NULL)
2912                 RETURN(-ENOMEM);
2913
2914         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_STATFS);
2915         if (rc) {
2916                 ptlrpc_request_free(req);
2917                 RETURN(rc);
2918         }
2919         ptlrpc_request_set_replen(req);
2920         req->rq_request_portal = OST_CREATE_PORTAL;
2921         ptlrpc_at_set_req_timeout(req);
2922
2923         if (oinfo->oi_flags & OBD_STATFS_NODELAY) {
2924                 /* procfs requests not want stat in wait for avoid deadlock */
2925                 req->rq_no_resend = 1;
2926                 req->rq_no_delay = 1;
2927         }
2928
2929         req->rq_interpret_reply = osc_statfs_interpret;
2930         aa = ptlrpc_req_async_args(aa, req);
2931         aa->aa_oi = oinfo;
2932
2933         ptlrpc_set_add_req(rqset, req);
2934         RETURN(0);
2935 }
2936
2937 static int osc_statfs(const struct lu_env *env, struct obd_export *exp,
2938                       struct obd_statfs *osfs, time64_t max_age, __u32 flags)
2939 {
2940         struct obd_device     *obd = class_exp2obd(exp);
2941         struct obd_statfs     *msfs;
2942         struct ptlrpc_request *req;
2943         struct obd_import     *imp = NULL;
2944         int rc;
2945         ENTRY;
2946
2947
2948         /*Since the request might also come from lprocfs, so we need
2949          *sync this with client_disconnect_export Bug15684*/
2950         down_read(&obd->u.cli.cl_sem);
2951         if (obd->u.cli.cl_import)
2952                 imp = class_import_get(obd->u.cli.cl_import);
2953         up_read(&obd->u.cli.cl_sem);
2954         if (!imp)
2955                 RETURN(-ENODEV);
2956
2957         /* We could possibly pass max_age in the request (as an absolute
2958          * timestamp or a "seconds.usec ago") so the target can avoid doing
2959          * extra calls into the filesystem if that isn't necessary (e.g.
2960          * during mount that would help a bit).  Having relative timestamps
2961          * is not so great if request processing is slow, while absolute
2962          * timestamps are not ideal because they need time synchronization. */
2963         req = ptlrpc_request_alloc(imp, &RQF_OST_STATFS);
2964
2965         class_import_put(imp);
2966
2967         if (req == NULL)
2968                 RETURN(-ENOMEM);
2969
2970         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_STATFS);
2971         if (rc) {
2972                 ptlrpc_request_free(req);
2973                 RETURN(rc);
2974         }
2975         ptlrpc_request_set_replen(req);
2976         req->rq_request_portal = OST_CREATE_PORTAL;
2977         ptlrpc_at_set_req_timeout(req);
2978
2979         if (flags & OBD_STATFS_NODELAY) {
2980                 /* procfs requests not want stat in wait for avoid deadlock */
2981                 req->rq_no_resend = 1;
2982                 req->rq_no_delay = 1;
2983         }
2984
2985         rc = ptlrpc_queue_wait(req);
2986         if (rc)
2987                 GOTO(out, rc);
2988
2989         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
2990         if (msfs == NULL)
2991                 GOTO(out, rc = -EPROTO);
2992
2993         *osfs = *msfs;
2994
2995         EXIT;
2996 out:
2997         ptlrpc_req_finished(req);
2998         return rc;
2999 }
3000
3001 static int osc_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
3002                          void *karg, void __user *uarg)
3003 {
3004         struct obd_device *obd = exp->exp_obd;
3005         struct obd_ioctl_data *data = karg;
3006         int rc = 0;
3007
3008         ENTRY;
3009         if (!try_module_get(THIS_MODULE)) {
3010                 CERROR("%s: cannot get module '%s'\n", obd->obd_name,
3011                        module_name(THIS_MODULE));
3012                 return -EINVAL;
3013         }
3014         switch (cmd) {
3015         case OBD_IOC_CLIENT_RECOVER:
3016                 rc = ptlrpc_recover_import(obd->u.cli.cl_import,
3017                                            data->ioc_inlbuf1, 0);
3018                 if (rc > 0)
3019                         rc = 0;
3020                 break;
3021         case IOC_OSC_SET_ACTIVE:
3022                 rc = ptlrpc_set_import_active(obd->u.cli.cl_import,
3023                                               data->ioc_offset);
3024                 break;
3025         default:
3026                 rc = -ENOTTY;
3027                 CDEBUG(D_INODE, "%s: unrecognised ioctl %#x by %s: rc = %d\n",
3028                        obd->obd_name, cmd, current->comm, rc);
3029                 break;
3030         }
3031
3032         module_put(THIS_MODULE);
3033         return rc;
3034 }
3035
3036 int osc_set_info_async(const struct lu_env *env, struct obd_export *exp,
3037                        u32 keylen, void *key, u32 vallen, void *val,
3038                        struct ptlrpc_request_set *set)
3039 {
3040         struct ptlrpc_request *req;
3041         struct obd_device     *obd = exp->exp_obd;
3042         struct obd_import     *imp = class_exp2cliimp(exp);
3043         char                  *tmp;
3044         int                    rc;
3045         ENTRY;
3046
3047         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_SHUTDOWN, 10);
3048
3049         if (KEY_IS(KEY_CHECKSUM)) {
3050                 if (vallen != sizeof(int))
3051                         RETURN(-EINVAL);
3052                 exp->exp_obd->u.cli.cl_checksum = (*(int *)val) ? 1 : 0;
3053                 RETURN(0);
3054         }
3055
3056         if (KEY_IS(KEY_SPTLRPC_CONF)) {
3057                 sptlrpc_conf_client_adapt(obd);
3058                 RETURN(0);
3059         }
3060
3061         if (KEY_IS(KEY_FLUSH_CTX)) {
3062                 sptlrpc_import_flush_my_ctx(imp);
3063                 RETURN(0);
3064         }
3065
3066         if (KEY_IS(KEY_CACHE_LRU_SHRINK)) {
3067                 struct client_obd *cli = &obd->u.cli;
3068                 long nr = atomic_long_read(&cli->cl_lru_in_list) >> 1;
3069                 long target = *(long *)val;
3070
3071                 nr = osc_lru_shrink(env, cli, min(nr, target), true);
3072                 *(long *)val -= nr;
3073                 RETURN(0);
3074         }
3075
3076         if (!set && !KEY_IS(KEY_GRANT_SHRINK))
3077                 RETURN(-EINVAL);
3078
3079         /* We pass all other commands directly to OST. Since nobody calls osc
3080            methods directly and everybody is supposed to go through LOV, we
3081            assume lov checked invalid values for us.
3082            The only recognised values so far are evict_by_nid and mds_conn.
3083            Even if something bad goes through, we'd get a -EINVAL from OST
3084            anyway. */
3085
3086         req = ptlrpc_request_alloc(imp, KEY_IS(KEY_GRANT_SHRINK) ?
3087                                                 &RQF_OST_SET_GRANT_INFO :
3088                                                 &RQF_OBD_SET_INFO);
3089         if (req == NULL)
3090                 RETURN(-ENOMEM);
3091
3092         req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_KEY,
3093                              RCL_CLIENT, keylen);
3094         if (!KEY_IS(KEY_GRANT_SHRINK))
3095                 req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_VAL,
3096                                      RCL_CLIENT, vallen);
3097         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SET_INFO);
3098         if (rc) {
3099                 ptlrpc_request_free(req);
3100                 RETURN(rc);
3101         }
3102
3103         tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
3104         memcpy(tmp, key, keylen);
3105         tmp = req_capsule_client_get(&req->rq_pill, KEY_IS(KEY_GRANT_SHRINK) ?
3106                                                         &RMF_OST_BODY :
3107                                                         &RMF_SETINFO_VAL);
3108         memcpy(tmp, val, vallen);
3109
3110         if (KEY_IS(KEY_GRANT_SHRINK)) {
3111                 struct osc_grant_args *aa;
3112                 struct obdo *oa;
3113
3114                 aa = ptlrpc_req_async_args(aa, req);
3115                 OBD_SLAB_ALLOC_PTR_GFP(oa, osc_obdo_kmem, GFP_NOFS);
3116                 if (!oa) {
3117                         ptlrpc_req_finished(req);
3118                         RETURN(-ENOMEM);
3119                 }
3120                 *oa = ((struct ost_body *)val)->oa;
3121                 aa->aa_oa = oa;
3122                 req->rq_interpret_reply = osc_shrink_grant_interpret;
3123         }
3124
3125         ptlrpc_request_set_replen(req);
3126         if (!KEY_IS(KEY_GRANT_SHRINK)) {
3127                 LASSERT(set != NULL);
3128                 ptlrpc_set_add_req(set, req);
3129                 ptlrpc_check_set(NULL, set);
3130         } else {
3131                 ptlrpcd_add_req(req);
3132         }
3133
3134         RETURN(0);
3135 }
3136 EXPORT_SYMBOL(osc_set_info_async);
3137
3138 int osc_reconnect(const struct lu_env *env, struct obd_export *exp,
3139                   struct obd_device *obd, struct obd_uuid *cluuid,
3140                   struct obd_connect_data *data, void *localdata)
3141 {
3142         struct client_obd *cli = &obd->u.cli;
3143
3144         if (data != NULL && (data->ocd_connect_flags & OBD_CONNECT_GRANT)) {
3145                 long lost_grant;
3146                 long grant;
3147
3148                 spin_lock(&cli->cl_loi_list_lock);
3149                 grant = cli->cl_avail_grant + cli->cl_reserved_grant;
3150                 if (data->ocd_connect_flags & OBD_CONNECT_GRANT_PARAM) {
3151                         /* restore ocd_grant_blkbits as client page bits */
3152                         data->ocd_grant_blkbits = PAGE_SHIFT;
3153                         grant += cli->cl_dirty_grant;
3154                 } else {
3155                         grant += cli->cl_dirty_pages << PAGE_SHIFT;
3156                 }
3157                 data->ocd_grant = grant ? : 2 * cli_brw_size(obd);
3158                 lost_grant = cli->cl_lost_grant;
3159                 cli->cl_lost_grant = 0;
3160                 spin_unlock(&cli->cl_loi_list_lock);
3161
3162                 CDEBUG(D_RPCTRACE, "ocd_connect_flags: %#llx ocd_version: %d"
3163                        " ocd_grant: %d, lost: %ld.\n", data->ocd_connect_flags,
3164                        data->ocd_version, data->ocd_grant, lost_grant);
3165         }
3166
3167         RETURN(0);
3168 }
3169 EXPORT_SYMBOL(osc_reconnect);
3170
3171 int osc_disconnect(struct obd_export *exp)
3172 {
3173         struct obd_device *obd = class_exp2obd(exp);
3174         int rc;
3175
3176         rc = client_disconnect_export(exp);
3177         /**
3178          * Initially we put del_shrink_grant before disconnect_export, but it
3179          * causes the following problem if setup (connect) and cleanup
3180          * (disconnect) are tangled together.
3181          *      connect p1                     disconnect p2
3182          *   ptlrpc_connect_import
3183          *     ...............               class_manual_cleanup
3184          *                                     osc_disconnect
3185          *                                     del_shrink_grant
3186          *   ptlrpc_connect_interrupt
3187          *     osc_init_grant
3188          *   add this client to shrink list
3189          *                                      cleanup_osc
3190          * Bang! grant shrink thread trigger the shrink. BUG18662
3191          */
3192         osc_del_grant_list(&obd->u.cli);
3193         return rc;
3194 }
3195 EXPORT_SYMBOL(osc_disconnect);
3196
3197 int osc_ldlm_resource_invalidate(struct cfs_hash *hs, struct cfs_hash_bd *bd,
3198                                  struct hlist_node *hnode, void *arg)
3199 {
3200         struct lu_env *env = arg;
3201         struct ldlm_resource *res = cfs_hash_object(hs, hnode);
3202         struct ldlm_lock *lock;
3203         struct osc_object *osc = NULL;
3204         ENTRY;
3205
3206         lock_res(res);
3207         list_for_each_entry(lock, &res->lr_granted, l_res_link) {
3208                 if (lock->l_ast_data != NULL && osc == NULL) {
3209                         osc = lock->l_ast_data;
3210                         cl_object_get(osc2cl(osc));
3211                 }
3212
3213                 /* clear LDLM_FL_CLEANED flag to make sure it will be canceled
3214                  * by the 2nd round of ldlm_namespace_clean() call in
3215                  * osc_import_event(). */
3216                 ldlm_clear_cleaned(lock);
3217         }
3218         unlock_res(res);
3219
3220         if (osc != NULL) {
3221                 osc_object_invalidate(env, osc);
3222                 cl_object_put(env, osc2cl(osc));
3223         }
3224
3225         RETURN(0);
3226 }
3227 EXPORT_SYMBOL(osc_ldlm_resource_invalidate);
3228
3229 static int osc_import_event(struct obd_device *obd,
3230                             struct obd_import *imp,
3231                             enum obd_import_event event)
3232 {
3233         struct client_obd *cli;
3234         int rc = 0;
3235
3236         ENTRY;
3237         LASSERT(imp->imp_obd == obd);
3238
3239         switch (event) {
3240         case IMP_EVENT_DISCON: {
3241                 cli = &obd->u.cli;
3242                 spin_lock(&cli->cl_loi_list_lock);
3243                 cli->cl_avail_grant = 0;
3244                 cli->cl_lost_grant = 0;
3245                 spin_unlock(&cli->cl_loi_list_lock);
3246                 break;
3247         }
3248         case IMP_EVENT_INACTIVE: {
3249                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_INACTIVE);
3250                 break;
3251         }
3252         case IMP_EVENT_INVALIDATE: {
3253                 struct ldlm_namespace *ns = obd->obd_namespace;
3254                 struct lu_env         *env;
3255                 __u16                  refcheck;
3256
3257                 ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
3258
3259                 env = cl_env_get(&refcheck);
3260                 if (!IS_ERR(env)) {
3261                         osc_io_unplug(env, &obd->u.cli, NULL);
3262
3263                         cfs_hash_for_each_nolock(ns->ns_rs_hash,
3264                                                  osc_ldlm_resource_invalidate,
3265                                                  env, 0);
3266                         cl_env_put(env, &refcheck);
3267
3268                         ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
3269                 } else
3270                         rc = PTR_ERR(env);
3271                 break;
3272         }
3273         case IMP_EVENT_ACTIVE: {
3274                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_ACTIVE);
3275                 break;
3276         }
3277         case IMP_EVENT_OCD: {
3278                 struct obd_connect_data *ocd = &imp->imp_connect_data;
3279
3280                 if (ocd->ocd_connect_flags & OBD_CONNECT_GRANT)
3281                         osc_init_grant(&obd->u.cli, ocd);
3282
3283                 /* See bug 7198 */
3284                 if (ocd->ocd_connect_flags & OBD_CONNECT_REQPORTAL)
3285                         imp->imp_client->cli_request_portal =OST_REQUEST_PORTAL;
3286
3287                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_OCD);
3288                 break;
3289         }
3290         case IMP_EVENT_DEACTIVATE: {
3291                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_DEACTIVATE);
3292                 break;
3293         }
3294         case IMP_EVENT_ACTIVATE: {
3295                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_ACTIVATE);
3296                 break;
3297         }
3298         default:
3299                 CERROR("Unknown import event %d\n", event);
3300                 LBUG();
3301         }
3302         RETURN(rc);
3303 }
3304
3305 /**
3306  * Determine whether the lock can be canceled before replaying the lock
3307  * during recovery, see bug16774 for detailed information.
3308  *
3309  * \retval zero the lock can't be canceled
3310  * \retval other ok to cancel
3311  */
3312 static int osc_cancel_weight(struct ldlm_lock *lock)
3313 {
3314         /*
3315          * Cancel all unused and granted extent lock.
3316          */
3317         if (lock->l_resource->lr_type == LDLM_EXTENT &&
3318             ldlm_is_granted(lock) &&
3319             osc_ldlm_weigh_ast(lock) == 0)
3320                 RETURN(1);
3321
3322         RETURN(0);
3323 }
3324
3325 static int brw_queue_work(const struct lu_env *env, void *data)
3326 {
3327         struct client_obd *cli = data;
3328
3329         CDEBUG(D_CACHE, "Run writeback work for client obd %p.\n", cli);
3330
3331         osc_io_unplug(env, cli, NULL);
3332         RETURN(0);
3333 }
3334
3335 int osc_setup_common(struct obd_device *obd, struct lustre_cfg *lcfg)
3336 {
3337         struct client_obd *cli = &obd->u.cli;
3338         void *handler;
3339         int rc;
3340
3341         ENTRY;
3342
3343         rc = ptlrpcd_addref();
3344         if (rc)
3345                 RETURN(rc);
3346
3347         rc = client_obd_setup(obd, lcfg);
3348         if (rc)
3349                 GOTO(out_ptlrpcd, rc);
3350
3351
3352         handler = ptlrpcd_alloc_work(cli->cl_import, brw_queue_work, cli);
3353         if (IS_ERR(handler))
3354                 GOTO(out_ptlrpcd_work, rc = PTR_ERR(handler));
3355         cli->cl_writeback_work = handler;
3356
3357         handler = ptlrpcd_alloc_work(cli->cl_import, lru_queue_work, cli);
3358         if (IS_ERR(handler))
3359                 GOTO(out_ptlrpcd_work, rc = PTR_ERR(handler));
3360         cli->cl_lru_work = handler;
3361
3362         rc = osc_quota_setup(obd);
3363         if (rc)
3364                 GOTO(out_ptlrpcd_work, rc);
3365
3366         cli->cl_grant_shrink_interval = GRANT_SHRINK_INTERVAL;
3367         osc_update_next_shrink(cli);
3368
3369         RETURN(rc);
3370
3371 out_ptlrpcd_work:
3372         if (cli->cl_writeback_work != NULL) {
3373                 ptlrpcd_destroy_work(cli->cl_writeback_work);
3374                 cli->cl_writeback_work = NULL;
3375         }
3376         if (cli->cl_lru_work != NULL) {
3377                 ptlrpcd_destroy_work(cli->cl_lru_work);
3378                 cli->cl_lru_work = NULL;
3379         }
3380         client_obd_cleanup(obd);
3381 out_ptlrpcd:
3382         ptlrpcd_decref();
3383         RETURN(rc);
3384 }
3385 EXPORT_SYMBOL(osc_setup_common);
3386
3387 int osc_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
3388 {
3389         struct client_obd *cli = &obd->u.cli;
3390         int                adding;
3391         int                added;
3392         int                req_count;
3393         int                rc;
3394
3395         ENTRY;
3396
3397         rc = osc_setup_common(obd, lcfg);
3398         if (rc < 0)
3399                 RETURN(rc);
3400
3401         rc = osc_tunables_init(obd);
3402         if (rc)
3403                 RETURN(rc);
3404
3405         /*
3406          * We try to control the total number of requests with a upper limit
3407          * osc_reqpool_maxreqcount. There might be some race which will cause
3408          * over-limit allocation, but it is fine.
3409          */
3410         req_count = atomic_read(&osc_pool_req_count);
3411         if (req_count < osc_reqpool_maxreqcount) {
3412                 adding = cli->cl_max_rpcs_in_flight + 2;
3413                 if (req_count + adding > osc_reqpool_maxreqcount)
3414                         adding = osc_reqpool_maxreqcount - req_count;
3415
3416                 added = ptlrpc_add_rqs_to_pool(osc_rq_pool, adding);
3417                 atomic_add(added, &osc_pool_req_count);
3418         }
3419
3420         ns_register_cancel(obd->obd_namespace, osc_cancel_weight);
3421
3422         spin_lock(&osc_shrink_lock);
3423         list_add_tail(&cli->cl_shrink_list, &osc_shrink_list);
3424         spin_unlock(&osc_shrink_lock);
3425         cli->cl_import->imp_idle_timeout = osc_idle_timeout;
3426         cli->cl_import->imp_idle_debug = D_HA;
3427
3428         RETURN(0);
3429 }
3430
3431 int osc_precleanup_common(struct obd_device *obd)
3432 {
3433         struct client_obd *cli = &obd->u.cli;
3434         ENTRY;
3435
3436         /* LU-464
3437          * for echo client, export may be on zombie list, wait for
3438          * zombie thread to cull it, because cli.cl_import will be
3439          * cleared in client_disconnect_export():
3440          *   class_export_destroy() -> obd_cleanup() ->
3441          *   echo_device_free() -> echo_client_cleanup() ->
3442          *   obd_disconnect() -> osc_disconnect() ->
3443          *   client_disconnect_export()
3444          */
3445         obd_zombie_barrier();
3446         if (cli->cl_writeback_work) {
3447                 ptlrpcd_destroy_work(cli->cl_writeback_work);
3448                 cli->cl_writeback_work = NULL;
3449         }
3450
3451         if (cli->cl_lru_work) {
3452                 ptlrpcd_destroy_work(cli->cl_lru_work);
3453                 cli->cl_lru_work = NULL;
3454         }
3455
3456         obd_cleanup_client_import(obd);
3457         RETURN(0);
3458 }
3459 EXPORT_SYMBOL(osc_precleanup_common);
3460
3461 static int osc_precleanup(struct obd_device *obd)
3462 {
3463         ENTRY;
3464
3465         osc_precleanup_common(obd);
3466
3467         ptlrpc_lprocfs_unregister_obd(obd);
3468         RETURN(0);
3469 }
3470
3471 int osc_cleanup_common(struct obd_device *obd)
3472 {
3473         struct client_obd *cli = &obd->u.cli;
3474         int rc;
3475
3476         ENTRY;
3477
3478         spin_lock(&osc_shrink_lock);
3479         list_del(&cli->cl_shrink_list);
3480         spin_unlock(&osc_shrink_lock);
3481
3482         /* lru cleanup */
3483         if (cli->cl_cache != NULL) {
3484                 LASSERT(atomic_read(&cli->cl_cache->ccc_users) > 0);
3485                 spin_lock(&cli->cl_cache->ccc_lru_lock);
3486                 list_del_init(&cli->cl_lru_osc);
3487                 spin_unlock(&cli->cl_cache->ccc_lru_lock);
3488                 cli->cl_lru_left = NULL;
3489                 cl_cache_decref(cli->cl_cache);
3490                 cli->cl_cache = NULL;
3491         }
3492
3493         /* free memory of osc quota cache */
3494         osc_quota_cleanup(obd);
3495
3496         rc = client_obd_cleanup(obd);
3497
3498         ptlrpcd_decref();
3499         RETURN(rc);
3500 }
3501 EXPORT_SYMBOL(osc_cleanup_common);
3502
3503 static const struct obd_ops osc_obd_ops = {
3504         .o_owner                = THIS_MODULE,
3505         .o_setup                = osc_setup,
3506         .o_precleanup           = osc_precleanup,
3507         .o_cleanup              = osc_cleanup_common,
3508         .o_add_conn             = client_import_add_conn,
3509         .o_del_conn             = client_import_del_conn,
3510         .o_connect              = client_connect_import,
3511         .o_reconnect            = osc_reconnect,
3512         .o_disconnect           = osc_disconnect,
3513         .o_statfs               = osc_statfs,
3514         .o_statfs_async         = osc_statfs_async,
3515         .o_create               = osc_create,
3516         .o_destroy              = osc_destroy,
3517         .o_getattr              = osc_getattr,
3518         .o_setattr              = osc_setattr,
3519         .o_iocontrol            = osc_iocontrol,
3520         .o_set_info_async       = osc_set_info_async,
3521         .o_import_event         = osc_import_event,
3522         .o_quotactl             = osc_quotactl,
3523 };
3524
3525 static struct shrinker *osc_cache_shrinker;
3526 LIST_HEAD(osc_shrink_list);
3527 DEFINE_SPINLOCK(osc_shrink_lock);
3528
3529 #ifndef HAVE_SHRINKER_COUNT
3530 static int osc_cache_shrink(SHRINKER_ARGS(sc, nr_to_scan, gfp_mask))
3531 {
3532         struct shrink_control scv = {
3533                 .nr_to_scan = shrink_param(sc, nr_to_scan),
3534                 .gfp_mask   = shrink_param(sc, gfp_mask)
3535         };
3536         (void)osc_cache_shrink_scan(shrinker, &scv);
3537
3538         return osc_cache_shrink_count(shrinker, &scv);
3539 }
3540 #endif
3541
3542 static int __init osc_init(void)
3543 {
3544         unsigned int reqpool_size;
3545         unsigned int reqsize;
3546         int rc;
3547         DEF_SHRINKER_VAR(osc_shvar, osc_cache_shrink,
3548                          osc_cache_shrink_count, osc_cache_shrink_scan);
3549         ENTRY;
3550
3551         /* print an address of _any_ initialized kernel symbol from this
3552          * module, to allow debugging with gdb that doesn't support data
3553          * symbols from modules.*/
3554         CDEBUG(D_INFO, "Lustre OSC module (%p).\n", &osc_caches);
3555
3556         rc = lu_kmem_init(osc_caches);
3557         if (rc)
3558                 RETURN(rc);
3559
3560         rc = class_register_type(&osc_obd_ops, NULL, true, NULL,
3561                                  LUSTRE_OSC_NAME, &osc_device_type);
3562         if (rc)
3563                 GOTO(out_kmem, rc);
3564
3565         osc_cache_shrinker = set_shrinker(DEFAULT_SEEKS, &osc_shvar);
3566
3567         /* This is obviously too much memory, only prevent overflow here */
3568         if (osc_reqpool_mem_max >= 1 << 12 || osc_reqpool_mem_max == 0)
3569                 GOTO(out_type, rc = -EINVAL);
3570
3571         reqpool_size = osc_reqpool_mem_max << 20;
3572
3573         reqsize = 1;
3574         while (reqsize < OST_IO_MAXREQSIZE)
3575                 reqsize = reqsize << 1;
3576
3577         /*
3578          * We don't enlarge the request count in OSC pool according to
3579          * cl_max_rpcs_in_flight. The allocation from the pool will only be
3580          * tried after normal allocation failed. So a small OSC pool won't
3581          * cause much performance degression in most of cases.
3582          */
3583         osc_reqpool_maxreqcount = reqpool_size / reqsize;
3584
3585         atomic_set(&osc_pool_req_count, 0);
3586         osc_rq_pool = ptlrpc_init_rq_pool(0, OST_IO_MAXREQSIZE,
3587                                           ptlrpc_add_rqs_to_pool);
3588
3589         if (osc_rq_pool == NULL)
3590                 GOTO(out_type, rc = -ENOMEM);
3591
3592         rc = osc_start_grant_work();
3593         if (rc != 0)
3594                 GOTO(out_req_pool, rc);
3595
3596         RETURN(rc);
3597
3598 out_req_pool:
3599         ptlrpc_free_rq_pool(osc_rq_pool);
3600 out_type:
3601         class_unregister_type(LUSTRE_OSC_NAME);
3602 out_kmem:
3603         lu_kmem_fini(osc_caches);
3604
3605         RETURN(rc);
3606 }
3607
3608 static void __exit osc_exit(void)
3609 {
3610         osc_stop_grant_work();
3611         remove_shrinker(osc_cache_shrinker);
3612         class_unregister_type(LUSTRE_OSC_NAME);
3613         lu_kmem_fini(osc_caches);
3614         ptlrpc_free_rq_pool(osc_rq_pool);
3615 }
3616
3617 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
3618 MODULE_DESCRIPTION("Lustre Object Storage Client (OSC)");
3619 MODULE_VERSION(LUSTRE_VERSION_STRING);
3620 MODULE_LICENSE("GPL");
3621
3622 module_init(osc_init);
3623 module_exit(osc_exit);