lustre/osc/osc_request.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * Copyright (c) 2011 Whamcloud, Inc.
  34  */
  35 /*
  36  * This file is part of Lustre, http://www.lustre.org/
  37  * Lustre is a trademark of Sun Microsystems, Inc.
  38  */
  39
  40 #ifndef EXPORT_SYMTAB
  41 # define EXPORT_SYMTAB
  42 #endif
  43 #define DEBUG_SUBSYSTEM S_OSC
  44
  45 #include <libcfs/libcfs.h>
  46
  47 #ifndef __KERNEL__
  48 # include <liblustre.h>
  49 #endif
  50
  51 #include <lustre_dlm.h>
  52 #include <lustre_net.h>
  53 #include <lustre/lustre_user.h>
  54 #include <obd_cksum.h>
  55 #include <obd_ost.h>
  56 #include <obd_lov.h>
  57
  58 #ifdef  __CYGWIN__
  59 # include <ctype.h>
  60 #endif
  61
  62 #include <lustre_ha.h>
  63 #include <lprocfs_status.h>
  64 #include <lustre_log.h>
  65 #include <lustre_debug.h>
  66 #include <lustre_param.h>
  67 #include "osc_internal.h"
  68
  69 static quota_interface_t *quota_interface = NULL;
  70 extern quota_interface_t osc_quota_interface;
  71
  72 static void osc_release_ppga(struct brw_page **ppga, obd_count count);
  73 static int brw_interpret(const struct lu_env *env,
  74                          struct ptlrpc_request *req, void *data, int rc);
  75 int osc_cleanup(struct obd_device *obd);
  76
  77 /* Pack OSC object metadata for disk storage (LE byte order). */
  78 static int osc_packmd(struct obd_export *exp, struct lov_mds_md **lmmp,
  79                       struct lov_stripe_md *lsm)
  80 {
  81         int lmm_size;
  82         ENTRY;
  83
  84         lmm_size = sizeof(**lmmp);
  85         if (!lmmp)
  86                 RETURN(lmm_size);
  87
  88         if (*lmmp && !lsm) {
  89                 OBD_FREE(*lmmp, lmm_size);
  90                 *lmmp = NULL;
  91                 RETURN(0);
  92         }
  93
  94         if (!*lmmp) {
  95                 OBD_ALLOC(*lmmp, lmm_size);
  96                 if (!*lmmp)
  97                         RETURN(-ENOMEM);
  98         }
  99
 100         if (lsm) {
 101                 LASSERT(lsm->lsm_object_id);
 102                 LASSERT_SEQ_IS_MDT(lsm->lsm_object_seq);
 103                 (*lmmp)->lmm_object_id = cpu_to_le64(lsm->lsm_object_id);
 104                 (*lmmp)->lmm_object_seq = cpu_to_le64(lsm->lsm_object_seq);
 105         }
 106
 107         RETURN(lmm_size);
 108 }
 109
 110 /* Unpack OSC object metadata from disk storage (LE byte order). */
 111 static int osc_unpackmd(struct obd_export *exp, struct lov_stripe_md **lsmp,
 112                         struct lov_mds_md *lmm, int lmm_bytes)
 113 {
 114         int lsm_size;
 115         struct obd_import *imp = class_exp2cliimp(exp);
 116         ENTRY;
 117
 118         if (lmm != NULL) {
 119                 if (lmm_bytes < sizeof (*lmm)) {
 120                         CERROR("lov_mds_md too small: %d, need %d\n",
 121                                lmm_bytes, (int)sizeof(*lmm));
 122                         RETURN(-EINVAL);
 123                 }
 124                 /* XXX LOV_MAGIC etc check? */
 125
 126                 if (lmm->lmm_object_id == 0) {
 127                         CERROR("lov_mds_md: zero lmm_object_id\n");
 128                         RETURN(-EINVAL);
 129                 }
 130         }
 131
 132         lsm_size = lov_stripe_md_size(1);
 133         if (lsmp == NULL)
 134                 RETURN(lsm_size);
 135
 136         if (*lsmp != NULL && lmm == NULL) {
 137                 OBD_FREE((*lsmp)->lsm_oinfo[0], sizeof(struct lov_oinfo));
 138                 OBD_FREE(*lsmp, lsm_size);
 139                 *lsmp = NULL;
 140                 RETURN(0);
 141         }
 142
 143         if (*lsmp == NULL) {
 144                 OBD_ALLOC(*lsmp, lsm_size);
 145                 if (*lsmp == NULL)
 146                         RETURN(-ENOMEM);
 147                 OBD_ALLOC((*lsmp)->lsm_oinfo[0], sizeof(struct lov_oinfo));
 148                 if ((*lsmp)->lsm_oinfo[0] == NULL) {
 149                         OBD_FREE(*lsmp, lsm_size);
 150                         RETURN(-ENOMEM);
 151                 }
 152                 loi_init((*lsmp)->lsm_oinfo[0]);
 153         }
 154
 155         if (lmm != NULL) {
 156                 /* XXX zero *lsmp? */
 157                 (*lsmp)->lsm_object_id = le64_to_cpu (lmm->lmm_object_id);
 158                 (*lsmp)->lsm_object_seq = le64_to_cpu (lmm->lmm_object_seq);
 159                 LASSERT((*lsmp)->lsm_object_id);
 160                 LASSERT_SEQ_IS_MDT((*lsmp)->lsm_object_seq);
 161         }
 162
 163         if (imp != NULL &&
 164             (imp->imp_connect_data.ocd_connect_flags & OBD_CONNECT_MAXBYTES))
 165                 (*lsmp)->lsm_maxbytes = imp->imp_connect_data.ocd_maxbytes;
 166         else
 167                 (*lsmp)->lsm_maxbytes = LUSTRE_STRIPE_MAXBYTES;
 168
 169         RETURN(lsm_size);
 170 }
 171
 172 static inline void osc_pack_capa(struct ptlrpc_request *req,
 173                                  struct ost_body *body, void *capa)
 174 {
 175         struct obd_capa *oc = (struct obd_capa *)capa;
 176         struct lustre_capa *c;
 177
 178         if (!capa)
 179                 return;
 180
 181         c = req_capsule_client_get(&req->rq_pill, &RMF_CAPA1);
 182         LASSERT(c);
 183         capa_cpy(c, oc);
 184         body->oa.o_valid |= OBD_MD_FLOSSCAPA;
 185         DEBUG_CAPA(D_SEC, c, "pack");
 186 }
 187
 188 static inline void osc_pack_req_body(struct ptlrpc_request *req,
 189                                      struct obd_info *oinfo)
 190 {
 191         struct ost_body *body;
 192
 193         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 194         LASSERT(body);
 195
 196         lustre_set_wire_obdo(&body->oa, oinfo->oi_oa);
 197         osc_pack_capa(req, body, oinfo->oi_capa);
 198 }
 199
 200 static inline void osc_set_capa_size(struct ptlrpc_request *req,
 201                                      const struct req_msg_field *field,
 202                                      struct obd_capa *oc)
 203 {
 204         if (oc == NULL)
 205                 req_capsule_set_size(&req->rq_pill, field, RCL_CLIENT, 0);
 206         else
 207                 /* it is already calculated as sizeof struct obd_capa */
 208                 ;
 209 }
 210
 211 static int osc_getattr_interpret(const struct lu_env *env,
 212                                  struct ptlrpc_request *req,
 213                                  struct osc_async_args *aa, int rc)
 214 {
 215         struct ost_body *body;
 216         ENTRY;
 217
 218         if (rc != 0)
 219                 GOTO(out, rc);
 220
 221         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 222         if (body) {
 223                 CDEBUG(D_INODE, "mode: %o\n", body->oa.o_mode);
 224                 lustre_get_wire_obdo(aa->aa_oi->oi_oa, &body->oa);
 225
 226                 /* This should really be sent by the OST */
 227                 aa->aa_oi->oi_oa->o_blksize = PTLRPC_MAX_BRW_SIZE;
 228                 aa->aa_oi->oi_oa->o_valid |= OBD_MD_FLBLKSZ;
 229         } else {
 230                 CDEBUG(D_INFO, "can't unpack ost_body\n");
 231                 rc = -EPROTO;
 232                 aa->aa_oi->oi_oa->o_valid = 0;
 233         }
 234 out:
 235         rc = aa->aa_oi->oi_cb_up(aa->aa_oi, rc);
 236         RETURN(rc);
 237 }
 238
 239 static int osc_getattr_async(struct obd_export *exp, struct obd_info *oinfo,
 240                              struct ptlrpc_request_set *set)
 241 {
 242         struct ptlrpc_request *req;
 243         struct osc_async_args *aa;
 244         int                    rc;
 245         ENTRY;
 246
 247         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_GETATTR);
 248         if (req == NULL)
 249                 RETURN(-ENOMEM);
 250
 251         osc_set_capa_size(req, &RMF_CAPA1, oinfo->oi_capa);
 252         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GETATTR);
 253         if (rc) {
 254                 ptlrpc_request_free(req);
 255                 RETURN(rc);
 256         }
 257
 258         osc_pack_req_body(req, oinfo);
 259
 260         ptlrpc_request_set_replen(req);
 261         req->rq_interpret_reply = (ptlrpc_interpterer_t)osc_getattr_interpret;
 262
 263         CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
 264         aa = ptlrpc_req_async_args(req);
 265         aa->aa_oi = oinfo;
 266
 267         ptlrpc_set_add_req(set, req);
 268         RETURN(0);
 269 }
 270
 271 static int osc_getattr(struct obd_export *exp, struct obd_info *oinfo)
 272 {
 273         struct ptlrpc_request *req;
 274         struct ost_body       *body;
 275         int                    rc;
 276         ENTRY;
 277
 278         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_GETATTR);
 279         if (req == NULL)
 280                 RETURN(-ENOMEM);
 281
 282         osc_set_capa_size(req, &RMF_CAPA1, oinfo->oi_capa);
 283         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GETATTR);
 284         if (rc) {
 285                 ptlrpc_request_free(req);
 286                 RETURN(rc);
 287         }
 288
 289         osc_pack_req_body(req, oinfo);
 290
 291         ptlrpc_request_set_replen(req);
 292
 293         rc = ptlrpc_queue_wait(req);
 294         if (rc)
 295                 GOTO(out, rc);
 296
 297         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 298         if (body == NULL)
 299                 GOTO(out, rc = -EPROTO);
 300
 301         CDEBUG(D_INODE, "mode: %o\n", body->oa.o_mode);
 302         lustre_get_wire_obdo(oinfo->oi_oa, &body->oa);
 303
 304         /* This should really be sent by the OST */
 305         oinfo->oi_oa->o_blksize = PTLRPC_MAX_BRW_SIZE;
 306         oinfo->oi_oa->o_valid |= OBD_MD_FLBLKSZ;
 307
 308         EXIT;
 309  out:
 310         ptlrpc_req_finished(req);
 311         return rc;
 312 }
 313
 314 static int osc_setattr(struct obd_export *exp, struct obd_info *oinfo,
 315                        struct obd_trans_info *oti)
 316 {
 317         struct ptlrpc_request *req;
 318         struct ost_body       *body;
 319         int                    rc;
 320         ENTRY;
 321
 322         LASSERT(oinfo->oi_oa->o_valid & OBD_MD_FLGROUP);
 323
 324         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_SETATTR);
 325         if (req == NULL)
 326                 RETURN(-ENOMEM);
 327
 328         osc_set_capa_size(req, &RMF_CAPA1, oinfo->oi_capa);
 329         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SETATTR);
 330         if (rc) {
 331                 ptlrpc_request_free(req);
 332                 RETURN(rc);
 333         }
 334
 335         osc_pack_req_body(req, oinfo);
 336
 337         ptlrpc_request_set_replen(req);
 338
 339         rc = ptlrpc_queue_wait(req);
 340         if (rc)
 341                 GOTO(out, rc);
 342
 343         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 344         if (body == NULL)
 345                 GOTO(out, rc = -EPROTO);
 346
 347         lustre_get_wire_obdo(oinfo->oi_oa, &body->oa);
 348
 349         EXIT;
 350 out:
 351         ptlrpc_req_finished(req);
 352         RETURN(rc);
 353 }
 354
 355 static int osc_setattr_interpret(const struct lu_env *env,
 356                                  struct ptlrpc_request *req,
 357                                  struct osc_setattr_args *sa, int rc)
 358 {
 359         struct ost_body *body;
 360         ENTRY;
 361
 362         if (rc != 0)
 363                 GOTO(out, rc);
 364
 365         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 366         if (body == NULL)
 367                 GOTO(out, rc = -EPROTO);
 368
 369         lustre_get_wire_obdo(sa->sa_oa, &body->oa);
 370 out:
 371         rc = sa->sa_upcall(sa->sa_cookie, rc);
 372         RETURN(rc);
 373 }
 374
 375 int osc_setattr_async_base(struct obd_export *exp, struct obd_info *oinfo,
 376                            struct obd_trans_info *oti,
 377                            obd_enqueue_update_f upcall, void *cookie,
 378                            struct ptlrpc_request_set *rqset)
 379 {
 380         struct ptlrpc_request   *req;
 381         struct osc_setattr_args *sa;
 382         int                      rc;
 383         ENTRY;
 384
 385         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_SETATTR);
 386         if (req == NULL)
 387                 RETURN(-ENOMEM);
 388
 389         osc_set_capa_size(req, &RMF_CAPA1, oinfo->oi_capa);
 390         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SETATTR);
 391         if (rc) {
 392                 ptlrpc_request_free(req);
 393                 RETURN(rc);
 394         }
 395
 396         if (oti && oinfo->oi_oa->o_valid & OBD_MD_FLCOOKIE)
 397                 oinfo->oi_oa->o_lcookie = *oti->oti_logcookies;
 398
 399         osc_pack_req_body(req, oinfo);
 400
 401         ptlrpc_request_set_replen(req);
 402
 403         /* do mds to ost setattr asynchronously */
 404         if (!rqset) {
 405                 /* Do not wait for response. */
 406                 ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
 407         } else {
 408                 req->rq_interpret_reply =
 409                         (ptlrpc_interpterer_t)osc_setattr_interpret;
 410
 411                 CLASSERT (sizeof(*sa) <= sizeof(req->rq_async_args));
 412                 sa = ptlrpc_req_async_args(req);
 413                 sa->sa_oa = oinfo->oi_oa;
 414                 sa->sa_upcall = upcall;
 415                 sa->sa_cookie = cookie;
 416
 417                 if (rqset == PTLRPCD_SET)
 418                         ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
 419                 else
 420                         ptlrpc_set_add_req(rqset, req);
 421         }
 422
 423         RETURN(0);
 424 }
 425
 426 static int osc_setattr_async(struct obd_export *exp, struct obd_info *oinfo,
 427                              struct obd_trans_info *oti,
 428                              struct ptlrpc_request_set *rqset)
 429 {
 430         return osc_setattr_async_base(exp, oinfo, oti,
 431                                       oinfo->oi_cb_up, oinfo, rqset);
 432 }
 433
 434 int osc_real_create(struct obd_export *exp, struct obdo *oa,
 435                     struct lov_stripe_md **ea, struct obd_trans_info *oti)
 436 {
 437         struct ptlrpc_request *req;
 438         struct ost_body       *body;
 439         struct lov_stripe_md  *lsm;
 440         int                    rc;
 441         ENTRY;
 442
 443         LASSERT(oa);
 444         LASSERT(ea);
 445
 446         lsm = *ea;
 447         if (!lsm) {
 448                 rc = obd_alloc_memmd(exp, &lsm);
 449                 if (rc < 0)
 450                         RETURN(rc);
 451         }
 452
 453         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_CREATE);
 454         if (req == NULL)
 455                 GOTO(out, rc = -ENOMEM);
 456
 457         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_CREATE);
 458         if (rc) {
 459                 ptlrpc_request_free(req);
 460                 GOTO(out, rc);
 461         }
 462
 463         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 464         LASSERT(body);
 465         lustre_set_wire_obdo(&body->oa, oa);
 466
 467         ptlrpc_request_set_replen(req);
 468
 469         if ((oa->o_valid & OBD_MD_FLFLAGS) &&
 470             oa->o_flags == OBD_FL_DELORPHAN) {
 471                 DEBUG_REQ(D_HA, req,
 472                           "delorphan from OST integration");
 473                 /* Don't resend the delorphan req */
 474                 req->rq_no_resend = req->rq_no_delay = 1;
 475         }
 476
 477         rc = ptlrpc_queue_wait(req);
 478         if (rc)
 479                 GOTO(out_req, rc);
 480
 481         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 482         if (body == NULL)
 483                 GOTO(out_req, rc = -EPROTO);
 484
 485         lustre_get_wire_obdo(oa, &body->oa);
 486
 487         /* This should really be sent by the OST */
 488         oa->o_blksize = PTLRPC_MAX_BRW_SIZE;
 489         oa->o_valid |= OBD_MD_FLBLKSZ;
 490
 491         /* XXX LOV STACKING: the lsm that is passed to us from LOV does not
 492          * have valid lsm_oinfo data structs, so don't go touching that.
 493          * This needs to be fixed in a big way.
 494          */
 495         lsm->lsm_object_id = oa->o_id;
 496         lsm->lsm_object_seq = oa->o_seq;
 497         *ea = lsm;
 498
 499         if (oti != NULL) {
 500                 oti->oti_transno = lustre_msg_get_transno(req->rq_repmsg);
 501
 502                 if (oa->o_valid & OBD_MD_FLCOOKIE) {
 503                         if (!oti->oti_logcookies)
 504                                 oti_alloc_cookies(oti, 1);
 505                         *oti->oti_logcookies = oa->o_lcookie;
 506                 }
 507         }
 508
 509         CDEBUG(D_HA, "transno: "LPD64"\n",
 510                lustre_msg_get_transno(req->rq_repmsg));
 511 out_req:
 512         ptlrpc_req_finished(req);
 513 out:
 514         if (rc && !*ea)
 515                 obd_free_memmd(exp, &lsm);
 516         RETURN(rc);
 517 }
 518
 519 int osc_punch_base(struct obd_export *exp, struct obd_info *oinfo,
 520                    obd_enqueue_update_f upcall, void *cookie,
 521                    struct ptlrpc_request_set *rqset)
 522 {
 523         struct ptlrpc_request   *req;
 524         struct osc_setattr_args *sa;
 525         struct ost_body         *body;
 526         int                      rc;
 527         ENTRY;
 528
 529         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_PUNCH);
 530         if (req == NULL)
 531                 RETURN(-ENOMEM);
 532
 533         osc_set_capa_size(req, &RMF_CAPA1, oinfo->oi_capa);
 534         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_PUNCH);
 535         if (rc) {
 536                 ptlrpc_request_free(req);
 537                 RETURN(rc);
 538         }
 539         req->rq_request_portal = OST_IO_PORTAL; /* bug 7198 */
 540         ptlrpc_at_set_req_timeout(req);
 541
 542         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 543         LASSERT(body);
 544         lustre_set_wire_obdo(&body->oa, oinfo->oi_oa);
 545         osc_pack_capa(req, body, oinfo->oi_capa);
 546
 547         ptlrpc_request_set_replen(req);
 548
 549
 550         req->rq_interpret_reply = (ptlrpc_interpterer_t)osc_setattr_interpret;
 551         CLASSERT (sizeof(*sa) <= sizeof(req->rq_async_args));
 552         sa = ptlrpc_req_async_args(req);
 553         sa->sa_oa     = oinfo->oi_oa;
 554         sa->sa_upcall = upcall;
 555         sa->sa_cookie = cookie;
 556         if (rqset == PTLRPCD_SET)
 557                 ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
 558         else
 559                 ptlrpc_set_add_req(rqset, req);
 560
 561         RETURN(0);
 562 }
 563
 564 static int osc_punch(struct obd_export *exp, struct obd_info *oinfo,
 565                      struct obd_trans_info *oti,
 566                      struct ptlrpc_request_set *rqset)
 567 {
 568         oinfo->oi_oa->o_size   = oinfo->oi_policy.l_extent.start;
 569         oinfo->oi_oa->o_blocks = oinfo->oi_policy.l_extent.end;
 570         oinfo->oi_oa->o_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 571         return osc_punch_base(exp, oinfo,
 572                               oinfo->oi_cb_up, oinfo, rqset);
 573 }
 574
 575 static int osc_sync_interpret(const struct lu_env *env,
 576                               struct ptlrpc_request *req,
 577                               void *arg, int rc)
 578 {
 579         struct osc_async_args *aa = arg;
 580         struct ost_body *body;
 581         ENTRY;
 582
 583         if (rc)
 584                 GOTO(out, rc);
 585
 586         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 587         if (body == NULL) {
 588                 CERROR ("can't unpack ost_body\n");
 589                 GOTO(out, rc = -EPROTO);
 590         }
 591
 592         *aa->aa_oi->oi_oa = body->oa;
 593 out:
 594         rc = aa->aa_oi->oi_cb_up(aa->aa_oi, rc);
 595         RETURN(rc);
 596 }
 597
 598 static int osc_sync(struct obd_export *exp, struct obd_info *oinfo,
 599                     obd_size start, obd_size end,
 600                     struct ptlrpc_request_set *set)
 601 {
 602         struct ptlrpc_request *req;
 603         struct ost_body       *body;
 604         struct osc_async_args *aa;
 605         int                    rc;
 606         ENTRY;
 607
 608         if (!oinfo->oi_oa) {
 609                 CDEBUG(D_INFO, "oa NULL\n");
 610                 RETURN(-EINVAL);
 611         }
 612
 613         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_SYNC);
 614         if (req == NULL)
 615                 RETURN(-ENOMEM);
 616
 617         osc_set_capa_size(req, &RMF_CAPA1, oinfo->oi_capa);
 618         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SYNC);
 619         if (rc) {
 620                 ptlrpc_request_free(req);
 621                 RETURN(rc);
 622         }
 623
 624         /* overload the size and blocks fields in the oa with start/end */
 625         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 626         LASSERT(body);
 627         lustre_set_wire_obdo(&body->oa, oinfo->oi_oa);
 628         body->oa.o_size = start;
 629         body->oa.o_blocks = end;
 630         body->oa.o_valid |= (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS);
 631         osc_pack_capa(req, body, oinfo->oi_capa);
 632
 633         ptlrpc_request_set_replen(req);
 634         req->rq_interpret_reply = osc_sync_interpret;
 635
 636         CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
 637         aa = ptlrpc_req_async_args(req);
 638         aa->aa_oi = oinfo;
 639
 640         ptlrpc_set_add_req(set, req);
 641         RETURN (0);
 642 }
 643
 644 /* Find and cancel locally locks matched by @mode in the resource found by
 645  * @objid. Found locks are added into @cancel list. Returns the amount of
 646  * locks added to @cancels list. */
 647 static int osc_resource_get_unused(struct obd_export *exp, struct obdo *oa,
 648                                    cfs_list_t *cancels,
 649                                    ldlm_mode_t mode, int lock_flags)
 650 {
 651         struct ldlm_namespace *ns = exp->exp_obd->obd_namespace;
 652         struct ldlm_res_id res_id;
 653         struct ldlm_resource *res;
 654         int count;
 655         ENTRY;
 656
 657         osc_build_res_name(oa->o_id, oa->o_seq, &res_id);
 658         res = ldlm_resource_get(ns, NULL, &res_id, 0, 0);
 659         if (res == NULL)
 660                 RETURN(0);
 661
 662         LDLM_RESOURCE_ADDREF(res);
 663         count = ldlm_cancel_resource_local(res, cancels, NULL, mode,
 664                                            lock_flags, 0, NULL);
 665         LDLM_RESOURCE_DELREF(res);
 666         ldlm_resource_putref(res);
 667         RETURN(count);
 668 }
 669
 670 static int osc_destroy_interpret(const struct lu_env *env,
 671                                  struct ptlrpc_request *req, void *data,
 672                                  int rc)
 673 {
 674         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
 675
 676         cfs_atomic_dec(&cli->cl_destroy_in_flight);
 677         cfs_waitq_signal(&cli->cl_destroy_waitq);
 678         return 0;
 679 }
 680
 681 static int osc_can_send_destroy(struct client_obd *cli)
 682 {
 683         if (cfs_atomic_inc_return(&cli->cl_destroy_in_flight) <=
 684             cli->cl_max_rpcs_in_flight) {
 685                 /* The destroy request can be sent */
 686                 return 1;
 687         }
 688         if (cfs_atomic_dec_return(&cli->cl_destroy_in_flight) <
 689             cli->cl_max_rpcs_in_flight) {
 690                 /*
 691                  * The counter has been modified between the two atomic
 692                  * operations.
 693                  */
 694                 cfs_waitq_signal(&cli->cl_destroy_waitq);
 695         }
 696         return 0;
 697 }
 698
 699 /* Destroy requests can be async always on the client, and we don't even really
 700  * care about the return code since the client cannot do anything at all about
 701  * a destroy failure.
 702  * When the MDS is unlinking a filename, it saves the file objects into a
 703  * recovery llog, and these object records are cancelled when the OST reports
 704  * they were destroyed and sync'd to disk (i.e. transaction committed).
 705  * If the client dies, or the OST is down when the object should be destroyed,
 706  * the records are not cancelled, and when the OST reconnects to the MDS next,
 707  * it will retrieve the llog unlink logs and then sends the log cancellation
 708  * cookies to the MDS after committing destroy transactions. */
 709 static int osc_destroy(struct obd_export *exp, struct obdo *oa,
 710                        struct lov_stripe_md *ea, struct obd_trans_info *oti,
 711                        struct obd_export *md_export, void *capa)
 712 {
 713         struct client_obd     *cli = &exp->exp_obd->u.cli;
 714         struct ptlrpc_request *req;
 715         struct ost_body       *body;
 716         CFS_LIST_HEAD(cancels);
 717         int rc, count;
 718         ENTRY;
 719
 720         if (!oa) {
 721                 CDEBUG(D_INFO, "oa NULL\n");
 722                 RETURN(-EINVAL);
 723         }
 724
 725         count = osc_resource_get_unused(exp, oa, &cancels, LCK_PW,
 726                                         LDLM_FL_DISCARD_DATA);
 727
 728         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_DESTROY);
 729         if (req == NULL) {
 730                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
 731                 RETURN(-ENOMEM);
 732         }
 733
 734         osc_set_capa_size(req, &RMF_CAPA1, (struct obd_capa *)capa);
 735         rc = ldlm_prep_elc_req(exp, req, LUSTRE_OST_VERSION, OST_DESTROY,
 736                                0, &cancels, count);
 737         if (rc) {
 738                 ptlrpc_request_free(req);
 739                 RETURN(rc);
 740         }
 741
 742         req->rq_request_portal = OST_IO_PORTAL; /* bug 7198 */
 743         ptlrpc_at_set_req_timeout(req);
 744
 745         if (oti != NULL && oa->o_valid & OBD_MD_FLCOOKIE)
 746                 oa->o_lcookie = *oti->oti_logcookies;
 747         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 748         LASSERT(body);
 749         lustre_set_wire_obdo(&body->oa, oa);
 750
 751         osc_pack_capa(req, body, (struct obd_capa *)capa);
 752         ptlrpc_request_set_replen(req);
 753
 754         /* don't throttle destroy RPCs for the MDT */
 755         if (!(cli->cl_import->imp_connect_flags_orig & OBD_CONNECT_MDS)) {
 756                 req->rq_interpret_reply = osc_destroy_interpret;
 757                 if (!osc_can_send_destroy(cli)) {
 758                         struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP,
 759                                                           NULL);
 760
 761                         /*
 762                          * Wait until the number of on-going destroy RPCs drops
 763                          * under max_rpc_in_flight
 764                          */
 765                         l_wait_event_exclusive(cli->cl_destroy_waitq,
 766                                                osc_can_send_destroy(cli), &lwi);
 767                 }
 768         }
 769
 770         /* Do not wait for response */
 771         ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
 772         RETURN(0);
 773 }
 774
 775 static void osc_announce_cached(struct client_obd *cli, struct obdo *oa,
 776                                 long writing_bytes)
 777 {
 778         obd_flag bits = OBD_MD_FLBLOCKS|OBD_MD_FLGRANT;
 779
 780         LASSERT(!(oa->o_valid & bits));
 781
 782         oa->o_valid |= bits;
 783         client_obd_list_lock(&cli->cl_loi_list_lock);
 784         oa->o_dirty = cli->cl_dirty;
 785         if (cli->cl_dirty - cli->cl_dirty_transit > cli->cl_dirty_max) {
 786                 CERROR("dirty %lu - %lu > dirty_max %lu\n",
 787                        cli->cl_dirty, cli->cl_dirty_transit, cli->cl_dirty_max);
 788                 oa->o_undirty = 0;
 789         } else if (cfs_atomic_read(&obd_dirty_pages) -
 790                    cfs_atomic_read(&obd_dirty_transit_pages) >
 791                    obd_max_dirty_pages + 1){
 792                 /* The cfs_atomic_read() allowing the cfs_atomic_inc() are
 793                  * not covered by a lock thus they may safely race and trip
 794                  * this CERROR() unless we add in a small fudge factor (+1). */
 795                 CERROR("dirty %d - %d > system dirty_max %d\n",
 796                        cfs_atomic_read(&obd_dirty_pages),
 797                        cfs_atomic_read(&obd_dirty_transit_pages),
 798                        obd_max_dirty_pages);
 799                 oa->o_undirty = 0;
 800         } else if (cli->cl_dirty_max - cli->cl_dirty > 0x7fffffff) {
 801                 CERROR("dirty %lu - dirty_max %lu too big???\n",
 802                        cli->cl_dirty, cli->cl_dirty_max);
 803                 oa->o_undirty = 0;
 804         } else {
 805                 long max_in_flight = (cli->cl_max_pages_per_rpc << CFS_PAGE_SHIFT)*
 806                                 (cli->cl_max_rpcs_in_flight + 1);
 807                 oa->o_undirty = max(cli->cl_dirty_max, max_in_flight);
 808         }
 809         oa->o_grant = cli->cl_avail_grant;
 810         oa->o_dropped = cli->cl_lost_grant;
 811         cli->cl_lost_grant = 0;
 812         client_obd_list_unlock(&cli->cl_loi_list_lock);
 813         CDEBUG(D_CACHE,"dirty: "LPU64" undirty: %u dropped %u grant: "LPU64"\n",
 814                oa->o_dirty, oa->o_undirty, oa->o_dropped, oa->o_grant);
 815
 816 }
 817
 818 static void osc_update_next_shrink(struct client_obd *cli)
 819 {
 820         cli->cl_next_shrink_grant =
 821                 cfs_time_shift(cli->cl_grant_shrink_interval);
 822         CDEBUG(D_CACHE, "next time %ld to shrink grant \n",
 823                cli->cl_next_shrink_grant);
 824 }
 825
 826 /* caller must hold loi_list_lock */
 827 static void osc_consume_write_grant(struct client_obd *cli,
 828                                     struct brw_page *pga)
 829 {
 830         LASSERT_SPIN_LOCKED(&cli->cl_loi_list_lock.lock);
 831         LASSERT(!(pga->flag & OBD_BRW_FROM_GRANT));
 832         cfs_atomic_inc(&obd_dirty_pages);
 833         cli->cl_dirty += CFS_PAGE_SIZE;
 834         cli->cl_avail_grant -= CFS_PAGE_SIZE;
 835         pga->flag |= OBD_BRW_FROM_GRANT;
 836         CDEBUG(D_CACHE, "using %lu grant credits for brw %p page %p\n",
 837                CFS_PAGE_SIZE, pga, pga->pg);
 838         LASSERT(cli->cl_avail_grant >= 0);
 839         osc_update_next_shrink(cli);
 840 }
 841
 842 /* the companion to osc_consume_write_grant, called when a brw has completed.
 843  * must be called with the loi lock held. */
 844 static void osc_release_write_grant(struct client_obd *cli,
 845                                     struct brw_page *pga, int sent)
 846 {
 847         int blocksize = cli->cl_import->imp_obd->obd_osfs.os_bsize ? : 4096;
 848         ENTRY;
 849
 850         LASSERT_SPIN_LOCKED(&cli->cl_loi_list_lock.lock);
 851         if (!(pga->flag & OBD_BRW_FROM_GRANT)) {
 852                 EXIT;
 853                 return;
 854         }
 855
 856         pga->flag &= ~OBD_BRW_FROM_GRANT;
 857         cfs_atomic_dec(&obd_dirty_pages);
 858         cli->cl_dirty -= CFS_PAGE_SIZE;
 859         if (pga->flag & OBD_BRW_NOCACHE) {
 860                 pga->flag &= ~OBD_BRW_NOCACHE;
 861                 cfs_atomic_dec(&obd_dirty_transit_pages);
 862                 cli->cl_dirty_transit -= CFS_PAGE_SIZE;
 863         }
 864         if (!sent) {
 865                 cli->cl_lost_grant += CFS_PAGE_SIZE;
 866                 CDEBUG(D_CACHE, "lost grant: %lu avail grant: %lu dirty: %lu\n",
 867                        cli->cl_lost_grant, cli->cl_avail_grant, cli->cl_dirty);
 868         } else if (CFS_PAGE_SIZE != blocksize && pga->count != CFS_PAGE_SIZE) {
 869                 /* For short writes we shouldn't count parts of pages that
 870                  * span a whole block on the OST side, or our accounting goes
 871                  * wrong.  Should match the code in filter_grant_check. */
 872                 int offset = pga->off & ~CFS_PAGE_MASK;
 873                 int count = pga->count + (offset & (blocksize - 1));
 874                 int end = (offset + pga->count) & (blocksize - 1);
 875                 if (end)
 876                         count += blocksize - end;
 877
 878                 cli->cl_lost_grant += CFS_PAGE_SIZE - count;
 879                 CDEBUG(D_CACHE, "lost %lu grant: %lu avail: %lu dirty: %lu\n",
 880                        CFS_PAGE_SIZE - count, cli->cl_lost_grant,
 881                        cli->cl_avail_grant, cli->cl_dirty);
 882         }
 883
 884         EXIT;
 885 }
 886
 887 static unsigned long rpcs_in_flight(struct client_obd *cli)
 888 {
 889         return cli->cl_r_in_flight + cli->cl_w_in_flight;
 890 }
 891
 892 /* caller must hold loi_list_lock */
 893 void osc_wake_cache_waiters(struct client_obd *cli)
 894 {
 895         cfs_list_t *l, *tmp;
 896         struct osc_cache_waiter *ocw;
 897
 898         ENTRY;
 899         cfs_list_for_each_safe(l, tmp, &cli->cl_cache_waiters) {
 900                 /* if we can't dirty more, we must wait until some is written */
 901                 if ((cli->cl_dirty + CFS_PAGE_SIZE > cli->cl_dirty_max) ||
 902                    (cfs_atomic_read(&obd_dirty_pages) + 1 >
 903                     obd_max_dirty_pages)) {
 904                         CDEBUG(D_CACHE, "no dirty room: dirty: %ld "
 905                                "osc max %ld, sys max %d\n", cli->cl_dirty,
 906                                cli->cl_dirty_max, obd_max_dirty_pages);
 907                         return;
 908                 }
 909
 910                 /* if still dirty cache but no grant wait for pending RPCs that
 911                  * may yet return us some grant before doing sync writes */
 912                 if (cli->cl_w_in_flight && cli->cl_avail_grant < CFS_PAGE_SIZE) {
 913                         CDEBUG(D_CACHE, "%u BRW writes in flight, no grant\n",
 914                                cli->cl_w_in_flight);
 915                         return;
 916                 }
 917
 918                 ocw = cfs_list_entry(l, struct osc_cache_waiter, ocw_entry);
 919                 cfs_list_del_init(&ocw->ocw_entry);
 920                 if (cli->cl_avail_grant < CFS_PAGE_SIZE) {
 921                         /* no more RPCs in flight to return grant, do sync IO */
 922                         ocw->ocw_rc = -EDQUOT;
 923                         CDEBUG(D_INODE, "wake oap %p for sync\n", ocw->ocw_oap);
 924                 } else {
 925                         osc_consume_write_grant(cli,
 926                                                 &ocw->ocw_oap->oap_brw_page);
 927                 }
 928
 929                 cfs_waitq_signal(&ocw->ocw_waitq);
 930         }
 931
 932         EXIT;
 933 }
 934
 935 static void __osc_update_grant(struct client_obd *cli, obd_size grant)
 936 {
 937         client_obd_list_lock(&cli->cl_loi_list_lock);
 938         cli->cl_avail_grant += grant;
 939         client_obd_list_unlock(&cli->cl_loi_list_lock);
 940 }
 941
 942 static void osc_update_grant(struct client_obd *cli, struct ost_body *body)
 943 {
 944         if (body->oa.o_valid & OBD_MD_FLGRANT) {
 945                 CDEBUG(D_CACHE, "got "LPU64" extra grant\n", body->oa.o_grant);
 946                 __osc_update_grant(cli, body->oa.o_grant);
 947         }
 948 }
 949
 950 static int osc_set_info_async(struct obd_export *exp, obd_count keylen,
 951                               void *key, obd_count vallen, void *val,
 952                               struct ptlrpc_request_set *set);
 953
 954 static int osc_shrink_grant_interpret(const struct lu_env *env,
 955                                       struct ptlrpc_request *req,
 956                                       void *aa, int rc)
 957 {
 958         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
 959         struct obdo *oa = ((struct osc_grant_args *)aa)->aa_oa;
 960         struct ost_body *body;
 961
 962         if (rc != 0) {
 963                 __osc_update_grant(cli, oa->o_grant);
 964                 GOTO(out, rc);
 965         }
 966
 967         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 968         LASSERT(body);
 969         osc_update_grant(cli, body);
 970 out:
 971         OBDO_FREE(oa);
 972         return rc;
 973 }
 974
 975 static void osc_shrink_grant_local(struct client_obd *cli, struct obdo *oa)
 976 {
 977         client_obd_list_lock(&cli->cl_loi_list_lock);
 978         oa->o_grant = cli->cl_avail_grant / 4;
 979         cli->cl_avail_grant -= oa->o_grant;
 980         client_obd_list_unlock(&cli->cl_loi_list_lock);
 981         if (!(oa->o_valid & OBD_MD_FLFLAGS)) {
 982                 oa->o_valid |= OBD_MD_FLFLAGS;
 983                 oa->o_flags = 0;
 984         }
 985         oa->o_flags |= OBD_FL_SHRINK_GRANT;
 986         osc_update_next_shrink(cli);
 987 }
 988
 989 /* Shrink the current grant, either from some large amount to enough for a
 990  * full set of in-flight RPCs, or if we have already shrunk to that limit
 991  * then to enough for a single RPC.  This avoids keeping more grant than
 992  * needed, and avoids shrinking the grant piecemeal. */
 993 static int osc_shrink_grant(struct client_obd *cli)
 994 {
 995         long target = (cli->cl_max_rpcs_in_flight + 1) *
 996                       cli->cl_max_pages_per_rpc;
 997
 998         client_obd_list_lock(&cli->cl_loi_list_lock);
 999         if (cli->cl_avail_grant <= target)
1000                 target = cli->cl_max_pages_per_rpc;
1001         client_obd_list_unlock(&cli->cl_loi_list_lock);
1002
1003         return osc_shrink_grant_to_target(cli, target);
1004 }
1005
1006 int osc_shrink_grant_to_target(struct client_obd *cli, long target)
1007 {
1008         int    rc = 0;
1009         struct ost_body     *body;
1010         ENTRY;
1011
1012         client_obd_list_lock(&cli->cl_loi_list_lock);
1013         /* Don't shrink if we are already above or below the desired limit
1014          * We don't want to shrink below a single RPC, as that will negatively
1015          * impact block allocation and long-term performance. */
1016         if (target < cli->cl_max_pages_per_rpc)
1017                 target = cli->cl_max_pages_per_rpc;
1018
1019         if (target >= cli->cl_avail_grant) {
1020                 client_obd_list_unlock(&cli->cl_loi_list_lock);
1021                 RETURN(0);
1022         }
1023         client_obd_list_unlock(&cli->cl_loi_list_lock);
1024
1025         OBD_ALLOC_PTR(body);
1026         if (!body)
1027                 RETURN(-ENOMEM);
1028
1029         osc_announce_cached(cli, &body->oa, 0);
1030
1031         client_obd_list_lock(&cli->cl_loi_list_lock);
1032         body->oa.o_grant = cli->cl_avail_grant - target;
1033         cli->cl_avail_grant = target;
1034         client_obd_list_unlock(&cli->cl_loi_list_lock);
1035         if (!(body->oa.o_valid & OBD_MD_FLFLAGS)) {
1036                 body->oa.o_valid |= OBD_MD_FLFLAGS;
1037                 body->oa.o_flags = 0;
1038         }
1039         body->oa.o_flags |= OBD_FL_SHRINK_GRANT;
1040         osc_update_next_shrink(cli);
1041
1042         rc = osc_set_info_async(cli->cl_import->imp_obd->obd_self_export,
1043                                 sizeof(KEY_GRANT_SHRINK), KEY_GRANT_SHRINK,
1044                                 sizeof(*body), body, NULL);
1045         if (rc != 0)
1046                 __osc_update_grant(cli, body->oa.o_grant);
1047         OBD_FREE_PTR(body);
1048         RETURN(rc);
1049 }
1050
1051 #define GRANT_SHRINK_LIMIT PTLRPC_MAX_BRW_SIZE
1052 static int osc_should_shrink_grant(struct client_obd *client)
1053 {
1054         cfs_time_t time = cfs_time_current();
1055         cfs_time_t next_shrink = client->cl_next_shrink_grant;
1056
1057         if ((client->cl_import->imp_connect_data.ocd_connect_flags &
1058              OBD_CONNECT_GRANT_SHRINK) == 0)
1059                 return 0;
1060
1061         if (cfs_time_aftereq(time, next_shrink - 5 * CFS_TICK)) {
1062                 if (client->cl_import->imp_state == LUSTRE_IMP_FULL &&
1063                     client->cl_avail_grant > GRANT_SHRINK_LIMIT)
1064                         return 1;
1065                 else
1066                         osc_update_next_shrink(client);
1067         }
1068         return 0;
1069 }
1070
1071 static int osc_grant_shrink_grant_cb(struct timeout_item *item, void *data)
1072 {
1073         struct client_obd *client;
1074
1075         cfs_list_for_each_entry(client, &item->ti_obd_list,
1076                                 cl_grant_shrink_list) {
1077                 if (osc_should_shrink_grant(client))
1078                         osc_shrink_grant(client);
1079         }
1080         return 0;
1081 }
1082
1083 static int osc_add_shrink_grant(struct client_obd *client)
1084 {
1085         int rc;
1086
1087         rc = ptlrpc_add_timeout_client(client->cl_grant_shrink_interval,
1088                                        TIMEOUT_GRANT,
1089                                        osc_grant_shrink_grant_cb, NULL,
1090                                        &client->cl_grant_shrink_list);
1091         if (rc) {
1092                 CERROR("add grant client %s error %d\n",
1093                         client->cl_import->imp_obd->obd_name, rc);
1094                 return rc;
1095         }
1096         CDEBUG(D_CACHE, "add grant client %s \n",
1097                client->cl_import->imp_obd->obd_name);
1098         osc_update_next_shrink(client);
1099         return 0;
1100 }
1101
1102 static int osc_del_shrink_grant(struct client_obd *client)
1103 {
1104         return ptlrpc_del_timeout_client(&client->cl_grant_shrink_list,
1105                                          TIMEOUT_GRANT);
1106 }
1107
1108 static void osc_init_grant(struct client_obd *cli, struct obd_connect_data *ocd)
1109 {
1110         /*
1111          * ocd_grant is the total grant amount we're expect to hold: if we've
1112          * been evicted, it's the new avail_grant amount, cl_dirty will drop
1113          * to 0 as inflight RPCs fail out; otherwise, it's avail_grant + dirty.
1114          *
1115          * race is tolerable here: if we're evicted, but imp_state already
1116          * left EVICTED state, then cl_dirty must be 0 already.
1117          */
1118         client_obd_list_lock(&cli->cl_loi_list_lock);
1119         if (cli->cl_import->imp_state == LUSTRE_IMP_EVICTED)
1120                 cli->cl_avail_grant = ocd->ocd_grant;
1121         else
1122                 cli->cl_avail_grant = ocd->ocd_grant - cli->cl_dirty;
1123
1124         if (cli->cl_avail_grant < 0) {
1125                 CWARN("%s: available grant < 0, the OSS is probably not running"
1126                       " with patch from bug20278 (%ld) \n",
1127                       cli->cl_import->imp_obd->obd_name, cli->cl_avail_grant);
1128                 /* workaround for 1.6 servers which do not have
1129                  * the patch from bug20278 */
1130                 cli->cl_avail_grant = ocd->ocd_grant;
1131         }
1132
1133         client_obd_list_unlock(&cli->cl_loi_list_lock);
1134
1135         CDEBUG(D_CACHE, "%s, setting cl_avail_grant: %ld cl_lost_grant: %ld \n",
1136                cli->cl_import->imp_obd->obd_name,
1137                cli->cl_avail_grant, cli->cl_lost_grant);
1138
1139         if (ocd->ocd_connect_flags & OBD_CONNECT_GRANT_SHRINK &&
1140             cfs_list_empty(&cli->cl_grant_shrink_list))
1141                 osc_add_shrink_grant(cli);
1142 }
1143
1144 /* We assume that the reason this OSC got a short read is because it read
1145  * beyond the end of a stripe file; i.e. lustre is reading a sparse file
1146  * via the LOV, and it _knows_ it's reading inside the file, it's just that
1147  * this stripe never got written at or beyond this stripe offset yet. */
1148 static void handle_short_read(int nob_read, obd_count page_count,
1149                               struct brw_page **pga)
1150 {
1151         char *ptr;
1152         int i = 0;
1153
1154         /* skip bytes read OK */
1155         while (nob_read > 0) {
1156                 LASSERT (page_count > 0);
1157
1158                 if (pga[i]->count > nob_read) {
1159                         /* EOF inside this page */
1160                         ptr = cfs_kmap(pga[i]->pg) +
1161                                 (pga[i]->off & ~CFS_PAGE_MASK);
1162                         memset(ptr + nob_read, 0, pga[i]->count - nob_read);
1163                         cfs_kunmap(pga[i]->pg);
1164                         page_count--;
1165                         i++;
1166                         break;
1167                 }
1168
1169                 nob_read -= pga[i]->count;
1170                 page_count--;
1171                 i++;
1172         }
1173
1174         /* zero remaining pages */
1175         while (page_count-- > 0) {
1176                 ptr = cfs_kmap(pga[i]->pg) + (pga[i]->off & ~CFS_PAGE_MASK);
1177                 memset(ptr, 0, pga[i]->count);
1178                 cfs_kunmap(pga[i]->pg);
1179                 i++;
1180         }
1181 }
1182
1183 static int check_write_rcs(struct ptlrpc_request *req,
1184                            int requested_nob, int niocount,
1185                            obd_count page_count, struct brw_page **pga)
1186 {
1187         int     i;
1188         __u32   *remote_rcs;
1189
1190         remote_rcs = req_capsule_server_sized_get(&req->rq_pill, &RMF_RCS,
1191                                                   sizeof(*remote_rcs) *
1192                                                   niocount);
1193         if (remote_rcs == NULL) {
1194                 CDEBUG(D_INFO, "Missing/short RC vector on BRW_WRITE reply\n");
1195                 return(-EPROTO);
1196         }
1197
1198         /* return error if any niobuf was in error */
1199         for (i = 0; i < niocount; i++) {
1200                 if ((int)remote_rcs[i] < 0)
1201                         return(remote_rcs[i]);
1202
1203                 if (remote_rcs[i] != 0) {
1204                         CDEBUG(D_INFO, "rc[%d] invalid (%d) req %p\n",
1205                                 i, remote_rcs[i], req);
1206                         return(-EPROTO);
1207                 }
1208         }
1209
1210         if (req->rq_bulk->bd_nob_transferred != requested_nob) {
1211                 CERROR("Unexpected # bytes transferred: %d (requested %d)\n",
1212                        req->rq_bulk->bd_nob_transferred, requested_nob);
1213                 return(-EPROTO);
1214         }
1215
1216         return (0);
1217 }
1218
1219 static inline int can_merge_pages(struct brw_page *p1, struct brw_page *p2)
1220 {
1221         if (p1->flag != p2->flag) {
1222                 unsigned mask = ~(OBD_BRW_FROM_GRANT| OBD_BRW_NOCACHE|
1223                                   OBD_BRW_SYNC|OBD_BRW_ASYNC|OBD_BRW_NOQUOTA);
1224
1225                 /* warn if we try to combine flags that we don't know to be
1226                  * safe to combine */
1227                 if (unlikely((p1->flag & mask) != (p2->flag & mask))) {
1228                         CWARN("Saw flags 0x%x and 0x%x in the same brw, please "
1229                               "report this at http://bugs.whamcloud.com/\n",
1230                               p1->flag, p2->flag);
1231                 }
1232                 return 0;
1233         }
1234
1235         return (p1->off + p1->count == p2->off);
1236 }
1237
1238 static obd_count osc_checksum_bulk(int nob, obd_count pg_count,
1239                                    struct brw_page **pga, int opc,
1240                                    cksum_type_t cksum_type)
1241 {
1242         __u32 cksum;
1243         int i = 0;
1244
1245         LASSERT (pg_count > 0);
1246         cksum = init_checksum(cksum_type);
1247         while (nob > 0 && pg_count > 0) {
1248                 unsigned char *ptr = cfs_kmap(pga[i]->pg);
1249                 int off = pga[i]->off & ~CFS_PAGE_MASK;
1250                 int count = pga[i]->count > nob ? nob : pga[i]->count;
1251
1252                 /* corrupt the data before we compute the checksum, to
1253                  * simulate an OST->client data error */
1254                 if (i == 0 && opc == OST_READ &&
1255                     OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_RECEIVE))
1256                         memcpy(ptr + off, "bad1", min(4, nob));
1257                 cksum = compute_checksum(cksum, ptr + off, count, cksum_type);
1258                 cfs_kunmap(pga[i]->pg);
1259                 LL_CDEBUG_PAGE(D_PAGE, pga[i]->pg, "off %d checksum %x\n",
1260                                off, cksum);
1261
1262                 nob -= pga[i]->count;
1263                 pg_count--;
1264                 i++;
1265         }
1266         /* For sending we only compute the wrong checksum instead
1267          * of corrupting the data so it is still correct on a redo */
1268         if (opc == OST_WRITE && OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_SEND))
1269                 cksum++;
1270
1271         return cksum;
1272 }
1273
1274 static int osc_brw_prep_request(int cmd, struct client_obd *cli,struct obdo *oa,
1275                                 struct lov_stripe_md *lsm, obd_count page_count,
1276                                 struct brw_page **pga,
1277                                 struct ptlrpc_request **reqp,
1278                                 struct obd_capa *ocapa, int reserve,
1279                                 int resend)
1280 {
1281         struct ptlrpc_request   *req;
1282         struct ptlrpc_bulk_desc *desc;
1283         struct ost_body         *body;
1284         struct obd_ioobj        *ioobj;
1285         struct niobuf_remote    *niobuf;
1286         int niocount, i, requested_nob, opc, rc;
1287         struct osc_brw_async_args *aa;
1288         struct req_capsule      *pill;
1289         struct brw_page *pg_prev;
1290
1291         ENTRY;
1292         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_BRW_PREP_REQ))
1293                 RETURN(-ENOMEM); /* Recoverable */
1294         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_BRW_PREP_REQ2))
1295                 RETURN(-EINVAL); /* Fatal */
1296
1297         if ((cmd & OBD_BRW_WRITE) != 0) {
1298                 opc = OST_WRITE;
1299                 req = ptlrpc_request_alloc_pool(cli->cl_import,
1300                                                 cli->cl_import->imp_rq_pool,
1301                                                 &RQF_OST_BRW_WRITE);
1302         } else {
1303                 opc = OST_READ;
1304                 req = ptlrpc_request_alloc(cli->cl_import, &RQF_OST_BRW_READ);
1305         }
1306         if (req == NULL)
1307                 RETURN(-ENOMEM);
1308
1309         for (niocount = i = 1; i < page_count; i++) {
1310                 if (!can_merge_pages(pga[i - 1], pga[i]))
1311                         niocount++;
1312         }
1313
1314         pill = &req->rq_pill;
1315         req_capsule_set_size(pill, &RMF_OBD_IOOBJ, RCL_CLIENT,
1316                              sizeof(*ioobj));
1317         req_capsule_set_size(pill, &RMF_NIOBUF_REMOTE, RCL_CLIENT,
1318                              niocount * sizeof(*niobuf));
1319         osc_set_capa_size(req, &RMF_CAPA1, ocapa);
1320
1321         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, opc);
1322         if (rc) {
1323                 ptlrpc_request_free(req);
1324                 RETURN(rc);
1325         }
1326         req->rq_request_portal = OST_IO_PORTAL; /* bug 7198 */
1327         ptlrpc_at_set_req_timeout(req);
1328
1329         if (opc == OST_WRITE)
1330                 desc = ptlrpc_prep_bulk_imp(req, page_count,
1331                                             BULK_GET_SOURCE, OST_BULK_PORTAL);
1332         else
1333                 desc = ptlrpc_prep_bulk_imp(req, page_count,
1334                                             BULK_PUT_SINK, OST_BULK_PORTAL);
1335
1336         if (desc == NULL)
1337                 GOTO(out, rc = -ENOMEM);
1338         /* NB request now owns desc and will free it when it gets freed */
1339
1340         body = req_capsule_client_get(pill, &RMF_OST_BODY);
1341         ioobj = req_capsule_client_get(pill, &RMF_OBD_IOOBJ);
1342         niobuf = req_capsule_client_get(pill, &RMF_NIOBUF_REMOTE);
1343         LASSERT(body != NULL && ioobj != NULL && niobuf != NULL);
1344
1345         lustre_set_wire_obdo(&body->oa, oa);
1346
1347         obdo_to_ioobj(oa, ioobj);
1348         ioobj->ioo_bufcnt = niocount;
1349         osc_pack_capa(req, body, ocapa);
1350         LASSERT (page_count > 0);
1351         pg_prev = pga[0];
1352         for (requested_nob = i = 0; i < page_count; i++, niobuf++) {
1353                 struct brw_page *pg = pga[i];
1354                 int poff = pg->off & ~CFS_PAGE_MASK;
1355
1356                 LASSERT(pg->count > 0);
1357                 /* make sure there is no gap in the middle of page array */
1358                 LASSERTF(page_count == 1 ||
1359                          (ergo(i == 0, poff + pg->count == CFS_PAGE_SIZE) &&
1360                           ergo(i > 0 && i < page_count - 1,
1361                                poff == 0 && pg->count == CFS_PAGE_SIZE)   &&
1362                           ergo(i == page_count - 1, poff == 0)),
1363                          "i: %d/%d pg: %p off: "LPU64", count: %u\n",
1364                          i, page_count, pg, pg->off, pg->count);
1365 #ifdef __linux__
1366                 LASSERTF(i == 0 || pg->off > pg_prev->off,
1367                          "i %d p_c %u pg %p [pri %lu ind %lu] off "LPU64
1368                          " prev_pg %p [pri %lu ind %lu] off "LPU64"\n",
1369                          i, page_count,
1370                          pg->pg, page_private(pg->pg), pg->pg->index, pg->off,
1371                          pg_prev->pg, page_private(pg_prev->pg),
1372                          pg_prev->pg->index, pg_prev->off);
1373 #else
1374                 LASSERTF(i == 0 || pg->off > pg_prev->off,
1375                          "i %d p_c %u\n", i, page_count);
1376 #endif
1377                 LASSERT((pga[0]->flag & OBD_BRW_SRVLOCK) ==
1378                         (pg->flag & OBD_BRW_SRVLOCK));
1379
1380                 ptlrpc_prep_bulk_page(desc, pg->pg, poff, pg->count);
1381                 requested_nob += pg->count;
1382
1383                 if (i > 0 && can_merge_pages(pg_prev, pg)) {
1384                         niobuf--;
1385                         niobuf->len += pg->count;
1386                 } else {
1387                         niobuf->offset = pg->off;
1388                         niobuf->len    = pg->count;
1389                         niobuf->flags  = pg->flag;
1390                 }
1391                 pg_prev = pg;
1392         }
1393
1394         LASSERTF((void *)(niobuf - niocount) ==
1395                 req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE),
1396                 "want %p - real %p\n", req_capsule_client_get(&req->rq_pill,
1397                 &RMF_NIOBUF_REMOTE), (void *)(niobuf - niocount));
1398
1399         osc_announce_cached(cli, &body->oa, opc == OST_WRITE ? requested_nob:0);
1400         if (resend) {
1401                 if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0) {
1402                         body->oa.o_valid |= OBD_MD_FLFLAGS;
1403                         body->oa.o_flags = 0;
1404                 }
1405                 body->oa.o_flags |= OBD_FL_RECOV_RESEND;
1406         }
1407
1408         if (osc_should_shrink_grant(cli))
1409                 osc_shrink_grant_local(cli, &body->oa);
1410
1411         /* size[REQ_REC_OFF] still sizeof (*body) */
1412         if (opc == OST_WRITE) {
1413                 if (unlikely(cli->cl_checksum) &&
1414                     !sptlrpc_flavor_has_bulk(&req->rq_flvr)) {
1415                         /* store cl_cksum_type in a local variable since
1416                          * it can be changed via lprocfs */
1417                         cksum_type_t cksum_type = cli->cl_cksum_type;
1418
1419                         if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0) {
1420                                 oa->o_flags &= OBD_FL_LOCAL_MASK;
1421                                 body->oa.o_flags = 0;
1422                         }
1423                         body->oa.o_flags |= cksum_type_pack(cksum_type);
1424                         body->oa.o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1425                         body->oa.o_cksum = osc_checksum_bulk(requested_nob,
1426                                                              page_count, pga,
1427                                                              OST_WRITE,
1428                                                              cksum_type);
1429                         CDEBUG(D_PAGE, "checksum at write origin: %x\n",
1430                                body->oa.o_cksum);
1431                         /* save this in 'oa', too, for later checking */
1432                         oa->o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1433                         oa->o_flags |= cksum_type_pack(cksum_type);
1434                 } else {
1435                         /* clear out the checksum flag, in case this is a
1436                          * resend but cl_checksum is no longer set. b=11238 */
1437                         oa->o_valid &= ~OBD_MD_FLCKSUM;
1438                 }
1439                 oa->o_cksum = body->oa.o_cksum;
1440                 /* 1 RC per niobuf */
1441                 req_capsule_set_size(pill, &RMF_RCS, RCL_SERVER,
1442                                      sizeof(__u32) * niocount);
1443         } else {
1444                 if (unlikely(cli->cl_checksum) &&
1445                     !sptlrpc_flavor_has_bulk(&req->rq_flvr)) {
1446                         if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0)
1447                                 body->oa.o_flags = 0;
1448                         body->oa.o_flags |= cksum_type_pack(cli->cl_cksum_type);
1449                         body->oa.o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1450                 }
1451         }
1452         ptlrpc_request_set_replen(req);
1453
1454         CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
1455         aa = ptlrpc_req_async_args(req);
1456         aa->aa_oa = oa;
1457         aa->aa_requested_nob = requested_nob;
1458         aa->aa_nio_count = niocount;
1459         aa->aa_page_count = page_count;
1460         aa->aa_resends = 0;
1461         aa->aa_ppga = pga;
1462         aa->aa_cli = cli;
1463         CFS_INIT_LIST_HEAD(&aa->aa_oaps);
1464         if (ocapa && reserve)
1465                 aa->aa_ocapa = capa_get(ocapa);
1466
1467         *reqp = req;
1468         RETURN(0);
1469
1470  out:
1471         ptlrpc_req_finished(req);
1472         RETURN(rc);
1473 }
1474
1475 static int check_write_checksum(struct obdo *oa, const lnet_process_id_t *peer,
1476                                 __u32 client_cksum, __u32 server_cksum, int nob,
1477                                 obd_count page_count, struct brw_page **pga,
1478                                 cksum_type_t client_cksum_type)
1479 {
1480         __u32 new_cksum;
1481         char *msg;
1482         cksum_type_t cksum_type;
1483
1484         if (server_cksum == client_cksum) {
1485                 CDEBUG(D_PAGE, "checksum %x confirmed\n", client_cksum);
1486                 return 0;
1487         }
1488
1489         /* If this is mmaped file - it can be changed at any time */
1490         if (oa->o_valid & OBD_MD_FLFLAGS && oa->o_flags & OBD_FL_MMAP)
1491                 return 1;
1492
1493         cksum_type = cksum_type_unpack(oa->o_valid & OBD_MD_FLFLAGS ?
1494                                        oa->o_flags : 0);
1495         new_cksum = osc_checksum_bulk(nob, page_count, pga, OST_WRITE,
1496                                       cksum_type);
1497
1498         if (cksum_type != client_cksum_type)
1499                 msg = "the server did not use the checksum type specified in "
1500                       "the original request - likely a protocol problem";
1501         else if (new_cksum == server_cksum)
1502                 msg = "changed on the client after we checksummed it - "
1503                       "likely false positive due to mmap IO (bug 11742)";
1504         else if (new_cksum == client_cksum)
1505                 msg = "changed in transit before arrival at OST";
1506         else
1507                 msg = "changed in transit AND doesn't match the original - "
1508                       "likely false positive due to mmap IO (bug 11742)";
1509
1510         LCONSOLE_ERROR_MSG(0x132, "BAD WRITE CHECKSUM: %s: from %s inode "DFID
1511                            " object "LPU64"/"LPU64" extent ["LPU64"-"LPU64"]\n",
1512                            msg, libcfs_nid2str(peer->nid),
1513                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_seq : (__u64)0,
1514                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_oid : 0,
1515                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_ver : 0,
1516                            oa->o_id,
1517                            oa->o_valid & OBD_MD_FLGROUP ? oa->o_seq : (__u64)0,
1518                            pga[0]->off,
1519                            pga[page_count-1]->off + pga[page_count-1]->count - 1);
1520         CERROR("original client csum %x (type %x), server csum %x (type %x), "
1521                "client csum now %x\n", client_cksum, client_cksum_type,
1522                server_cksum, cksum_type, new_cksum);
1523         return 1;
1524 }
1525
1526 /* Note rc enters this function as number of bytes transferred */
1527 static int osc_brw_fini_request(struct ptlrpc_request *req, int rc)
1528 {
1529         struct osc_brw_async_args *aa = (void *)&req->rq_async_args;
1530         const lnet_process_id_t *peer =
1531                         &req->rq_import->imp_connection->c_peer;
1532         struct client_obd *cli = aa->aa_cli;
1533         struct ost_body *body;
1534         __u32 client_cksum = 0;
1535         ENTRY;
1536
1537         if (rc < 0 && rc != -EDQUOT) {
1538                 DEBUG_REQ(D_INFO, req, "Failed request with rc = %d\n", rc);
1539                 RETURN(rc);
1540         }
1541
1542         LASSERTF(req->rq_repmsg != NULL, "rc = %d\n", rc);
1543         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
1544         if (body == NULL) {
1545                 DEBUG_REQ(D_INFO, req, "Can't unpack body\n");
1546                 RETURN(-EPROTO);
1547         }
1548
1549 #ifdef HAVE_QUOTA_SUPPORT
1550         /* set/clear over quota flag for a uid/gid */
1551         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE &&
1552             body->oa.o_valid & (OBD_MD_FLUSRQUOTA | OBD_MD_FLGRPQUOTA)) {
1553                 unsigned int qid[MAXQUOTAS] = { body->oa.o_uid, body->oa.o_gid };
1554
1555                 CDEBUG(D_QUOTA, "setdq for [%u %u] with valid "LPX64", flags %x\n",
1556                        body->oa.o_uid, body->oa.o_gid, body->oa.o_valid,
1557                        body->oa.o_flags);
1558                 lquota_setdq(quota_interface, cli, qid, body->oa.o_valid,
1559                              body->oa.o_flags);
1560         }
1561 #endif
1562
1563         osc_update_grant(cli, body);
1564
1565         if (rc < 0)
1566                 RETURN(rc);
1567
1568         if (aa->aa_oa->o_valid & OBD_MD_FLCKSUM)
1569                 client_cksum = aa->aa_oa->o_cksum; /* save for later */
1570
1571         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE) {
1572                 if (rc > 0) {
1573                         CERROR("Unexpected +ve rc %d\n", rc);
1574                         RETURN(-EPROTO);
1575                 }
1576                 LASSERT(req->rq_bulk->bd_nob == aa->aa_requested_nob);
1577
1578                 if (sptlrpc_cli_unwrap_bulk_write(req, req->rq_bulk))
1579                         RETURN(-EAGAIN);
1580
1581                 if ((aa->aa_oa->o_valid & OBD_MD_FLCKSUM) && client_cksum &&
1582                     check_write_checksum(&body->oa, peer, client_cksum,
1583                                          body->oa.o_cksum, aa->aa_requested_nob,
1584                                          aa->aa_page_count, aa->aa_ppga,
1585                                          cksum_type_unpack(aa->aa_oa->o_flags)))
1586                         RETURN(-EAGAIN);
1587
1588                 rc = check_write_rcs(req, aa->aa_requested_nob,aa->aa_nio_count,
1589                                      aa->aa_page_count, aa->aa_ppga);
1590                 GOTO(out, rc);
1591         }
1592
1593         /* The rest of this function executes only for OST_READs */
1594
1595         /* if unwrap_bulk failed, return -EAGAIN to retry */
1596         rc = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk, rc);
1597         if (rc < 0)
1598                 GOTO(out, rc = -EAGAIN);
1599
1600         if (rc > aa->aa_requested_nob) {
1601                 CERROR("Unexpected rc %d (%d requested)\n", rc,
1602                        aa->aa_requested_nob);
1603                 RETURN(-EPROTO);
1604         }
1605
1606         if (rc != req->rq_bulk->bd_nob_transferred) {
1607                 CERROR ("Unexpected rc %d (%d transferred)\n",
1608                         rc, req->rq_bulk->bd_nob_transferred);
1609                 return (-EPROTO);
1610         }
1611
1612         if (rc < aa->aa_requested_nob)
1613                 handle_short_read(rc, aa->aa_page_count, aa->aa_ppga);
1614
1615         if (body->oa.o_valid & OBD_MD_FLCKSUM) {
1616                 static int cksum_counter;
1617                 __u32      server_cksum = body->oa.o_cksum;
1618                 char      *via;
1619                 char      *router;
1620                 cksum_type_t cksum_type;
1621
1622                 cksum_type = cksum_type_unpack(body->oa.o_valid &OBD_MD_FLFLAGS?
1623                                                body->oa.o_flags : 0);
1624                 client_cksum = osc_checksum_bulk(rc, aa->aa_page_count,
1625                                                  aa->aa_ppga, OST_READ,
1626                                                  cksum_type);
1627
1628                 if (peer->nid == req->rq_bulk->bd_sender) {
1629                         via = router = "";
1630                 } else {
1631                         via = " via ";
1632                         router = libcfs_nid2str(req->rq_bulk->bd_sender);
1633                 }
1634
1635                 if (server_cksum == ~0 && rc > 0) {
1636                         CERROR("Protocol error: server %s set the 'checksum' "
1637                                "bit, but didn't send a checksum.  Not fatal, "
1638                                "but please notify on http://bugs.whamcloud.com/\n",
1639                                libcfs_nid2str(peer->nid));
1640                 } else if (server_cksum != client_cksum) {
1641                         LCONSOLE_ERROR_MSG(0x133, "%s: BAD READ CHECKSUM: from "
1642                                            "%s%s%s inode "DFID" object "
1643                                            LPU64"/"LPU64" extent "
1644                                            "["LPU64"-"LPU64"]\n",
1645                                            req->rq_import->imp_obd->obd_name,
1646                                            libcfs_nid2str(peer->nid),
1647                                            via, router,
1648                                            body->oa.o_valid & OBD_MD_FLFID ?
1649                                                 body->oa.o_parent_seq : (__u64)0,
1650                                            body->oa.o_valid & OBD_MD_FLFID ?
1651                                                 body->oa.o_parent_oid : 0,
1652                                            body->oa.o_valid & OBD_MD_FLFID ?
1653                                                 body->oa.o_parent_ver : 0,
1654                                            body->oa.o_id,
1655                                            body->oa.o_valid & OBD_MD_FLGROUP ?
1656                                                 body->oa.o_seq : (__u64)0,
1657                                            aa->aa_ppga[0]->off,
1658                                            aa->aa_ppga[aa->aa_page_count-1]->off +
1659                                            aa->aa_ppga[aa->aa_page_count-1]->count -
1660                                                                         1);
1661                         CERROR("client %x, server %x, cksum_type %x\n",
1662                                client_cksum, server_cksum, cksum_type);
1663                         cksum_counter = 0;
1664                         aa->aa_oa->o_cksum = client_cksum;
1665                         rc = -EAGAIN;
1666                 } else {
1667                         cksum_counter++;
1668                         CDEBUG(D_PAGE, "checksum %x confirmed\n", client_cksum);
1669                         rc = 0;
1670                 }
1671         } else if (unlikely(client_cksum)) {
1672                 static int cksum_missed;
1673
1674                 cksum_missed++;
1675                 if ((cksum_missed & (-cksum_missed)) == cksum_missed)
1676                         CERROR("Checksum %u requested from %s but not sent\n",
1677                                cksum_missed, libcfs_nid2str(peer->nid));
1678         } else {
1679                 rc = 0;
1680         }
1681 out:
1682         if (rc >= 0)
1683                 lustre_get_wire_obdo(aa->aa_oa, &body->oa);
1684
1685         RETURN(rc);
1686 }
1687
1688 static int osc_brw_internal(int cmd, struct obd_export *exp, struct obdo *oa,
1689                             struct lov_stripe_md *lsm,
1690                             obd_count page_count, struct brw_page **pga,
1691                             struct obd_capa *ocapa)
1692 {
1693         struct ptlrpc_request *req;
1694         int                    rc;
1695         cfs_waitq_t            waitq;
1696         int                    resends = 0;
1697         struct l_wait_info     lwi;
1698
1699         ENTRY;
1700
1701         cfs_waitq_init(&waitq);
1702
1703 restart_bulk:
1704         rc = osc_brw_prep_request(cmd, &exp->exp_obd->u.cli, oa, lsm,
1705                                   page_count, pga, &req, ocapa, 0, resends);
1706         if (rc != 0)
1707                 return (rc);
1708
1709         rc = ptlrpc_queue_wait(req);
1710
1711         if (rc == -ETIMEDOUT && req->rq_resend) {
1712                 DEBUG_REQ(D_HA, req,  "BULK TIMEOUT");
1713                 ptlrpc_req_finished(req);
1714                 goto restart_bulk;
1715         }
1716
1717         rc = osc_brw_fini_request(req, rc);
1718
1719         ptlrpc_req_finished(req);
1720         if (osc_recoverable_error(rc)) {
1721                 resends++;
1722                 if (!client_should_resend(resends, &exp->exp_obd->u.cli)) {
1723                         CERROR("too many resend retries, returning error\n");
1724                         RETURN(-EIO);
1725                 }
1726
1727                 lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(resends), NULL, NULL, NULL);
1728                 l_wait_event(waitq, 0, &lwi);
1729
1730                 goto restart_bulk;
1731         }
1732
1733         RETURN (rc);
1734 }
1735
1736 int osc_brw_redo_request(struct ptlrpc_request *request,
1737                          struct osc_brw_async_args *aa)
1738 {
1739         struct ptlrpc_request *new_req;
1740         struct ptlrpc_request_set *set = request->rq_set;
1741         struct osc_brw_async_args *new_aa;
1742         struct osc_async_page *oap;
1743         int rc = 0;
1744         ENTRY;
1745
1746         if (!client_should_resend(aa->aa_resends, aa->aa_cli)) {
1747                 CERROR("too many resent retries, returning error\n");
1748                 RETURN(-EIO);
1749         }
1750
1751         DEBUG_REQ(D_ERROR, request, "redo for recoverable error");
1752
1753         rc = osc_brw_prep_request(lustre_msg_get_opc(request->rq_reqmsg) ==
1754                                         OST_WRITE ? OBD_BRW_WRITE :OBD_BRW_READ,
1755                                   aa->aa_cli, aa->aa_oa,
1756                                   NULL /* lsm unused by osc currently */,
1757                                   aa->aa_page_count, aa->aa_ppga,
1758                                   &new_req, aa->aa_ocapa, 0, 1);
1759         if (rc)
1760                 RETURN(rc);
1761
1762         client_obd_list_lock(&aa->aa_cli->cl_loi_list_lock);
1763
1764         cfs_list_for_each_entry(oap, &aa->aa_oaps, oap_rpc_item) {
1765                 if (oap->oap_request != NULL) {
1766                         LASSERTF(request == oap->oap_request,
1767                                  "request %p != oap_request %p\n",
1768                                  request, oap->oap_request);
1769                         if (oap->oap_interrupted) {
1770                                 client_obd_list_unlock(&aa->aa_cli->cl_loi_list_lock);
1771                                 ptlrpc_req_finished(new_req);
1772                                 RETURN(-EINTR);
1773                         }
1774                 }
1775         }
1776         /* New request takes over pga and oaps from old request.
1777          * Note that copying a list_head doesn't work, need to move it... */
1778         aa->aa_resends++;
1779         new_req->rq_interpret_reply = request->rq_interpret_reply;
1780         new_req->rq_async_args = request->rq_async_args;
1781         new_req->rq_sent = cfs_time_current_sec() + aa->aa_resends;
1782
1783         new_aa = ptlrpc_req_async_args(new_req);
1784
1785         CFS_INIT_LIST_HEAD(&new_aa->aa_oaps);
1786         cfs_list_splice(&aa->aa_oaps, &new_aa->aa_oaps);
1787         CFS_INIT_LIST_HEAD(&aa->aa_oaps);
1788
1789         cfs_list_for_each_entry(oap, &new_aa->aa_oaps, oap_rpc_item) {
1790                 if (oap->oap_request) {
1791                         ptlrpc_req_finished(oap->oap_request);
1792                         oap->oap_request = ptlrpc_request_addref(new_req);
1793                 }
1794         }
1795
1796         new_aa->aa_ocapa = aa->aa_ocapa;
1797         aa->aa_ocapa = NULL;
1798
1799         /* use ptlrpc_set_add_req is safe because interpret functions work
1800          * in check_set context. only one way exist with access to request
1801          * from different thread got -EINTR - this way protected with
1802          * cl_loi_list_lock */
1803         ptlrpc_set_add_req(set, new_req);
1804
1805         client_obd_list_unlock(&aa->aa_cli->cl_loi_list_lock);
1806
1807         DEBUG_REQ(D_INFO, new_req, "new request");
1808         RETURN(0);
1809 }
1810
1811 /*
1812  * ugh, we want disk allocation on the target to happen in offset order.  we'll
1813  * follow sedgewicks advice and stick to the dead simple shellsort -- it'll do
1814  * fine for our small page arrays and doesn't require allocation.  its an
1815  * insertion sort that swaps elements that are strides apart, shrinking the
1816  * stride down until its '1' and the array is sorted.
1817  */
1818 static void sort_brw_pages(struct brw_page **array, int num)
1819 {
1820         int stride, i, j;
1821         struct brw_page *tmp;
1822
1823         if (num == 1)
1824                 return;
1825         for (stride = 1; stride < num ; stride = (stride * 3) + 1)
1826                 ;
1827
1828         do {
1829                 stride /= 3;
1830                 for (i = stride ; i < num ; i++) {
1831                         tmp = array[i];
1832                         j = i;
1833                         while (j >= stride && array[j - stride]->off > tmp->off) {
1834                                 array[j] = array[j - stride];
1835                                 j -= stride;
1836                         }
1837                         array[j] = tmp;
1838                 }
1839         } while (stride > 1);
1840 }
1841
1842 static obd_count max_unfragmented_pages(struct brw_page **pg, obd_count pages)
1843 {
1844         int count = 1;
1845         int offset;
1846         int i = 0;
1847
1848         LASSERT (pages > 0);
1849         offset = pg[i]->off & ~CFS_PAGE_MASK;
1850
1851         for (;;) {
1852                 pages--;
1853                 if (pages == 0)         /* that's all */
1854                         return count;
1855
1856                 if (offset + pg[i]->count < CFS_PAGE_SIZE)
1857                         return count;   /* doesn't end on page boundary */
1858
1859                 i++;
1860                 offset = pg[i]->off & ~CFS_PAGE_MASK;
1861                 if (offset != 0)        /* doesn't start on page boundary */
1862                         return count;
1863
1864                 count++;
1865         }
1866 }
1867
1868 static struct brw_page **osc_build_ppga(struct brw_page *pga, obd_count count)
1869 {
1870         struct brw_page **ppga;
1871         int i;
1872
1873         OBD_ALLOC(ppga, sizeof(*ppga) * count);
1874         if (ppga == NULL)
1875                 return NULL;
1876
1877         for (i = 0; i < count; i++)
1878                 ppga[i] = pga + i;
1879         return ppga;
1880 }
1881
1882 static void osc_release_ppga(struct brw_page **ppga, obd_count count)
1883 {
1884         LASSERT(ppga != NULL);
1885         OBD_FREE(ppga, sizeof(*ppga) * count);
1886 }
1887
1888 static int osc_brw(int cmd, struct obd_export *exp, struct obd_info *oinfo,
1889                    obd_count page_count, struct brw_page *pga,
1890                    struct obd_trans_info *oti)
1891 {
1892         struct obdo *saved_oa = NULL;
1893         struct brw_page **ppga, **orig;
1894         struct obd_import *imp = class_exp2cliimp(exp);
1895         struct client_obd *cli;
1896         int rc, page_count_orig;
1897         ENTRY;
1898
1899         LASSERT((imp != NULL) && (imp->imp_obd != NULL));
1900         cli = &imp->imp_obd->u.cli;
1901
1902         if (cmd & OBD_BRW_CHECK) {
1903                 /* The caller just wants to know if there's a chance that this
1904                  * I/O can succeed */
1905
1906                 if (imp->imp_invalid)
1907                         RETURN(-EIO);
1908                 RETURN(0);
1909         }
1910
1911         /* test_brw with a failed create can trip this, maybe others. */
1912         LASSERT(cli->cl_max_pages_per_rpc);
1913
1914         rc = 0;
1915
1916         orig = ppga = osc_build_ppga(pga, page_count);
1917         if (ppga == NULL)
1918                 RETURN(-ENOMEM);
1919         page_count_orig = page_count;
1920
1921         sort_brw_pages(ppga, page_count);
1922         while (page_count) {
1923                 obd_count pages_per_brw;
1924
1925                 if (page_count > cli->cl_max_pages_per_rpc)
1926                         pages_per_brw = cli->cl_max_pages_per_rpc;
1927                 else
1928                         pages_per_brw = page_count;
1929
1930                 pages_per_brw = max_unfragmented_pages(ppga, pages_per_brw);
1931
1932                 if (saved_oa != NULL) {
1933                         /* restore previously saved oa */
1934                         *oinfo->oi_oa = *saved_oa;
1935                 } else if (page_count > pages_per_brw) {
1936                         /* save a copy of oa (brw will clobber it) */
1937                         OBDO_ALLOC(saved_oa);
1938                         if (saved_oa == NULL)
1939                                 GOTO(out, rc = -ENOMEM);
1940                         *saved_oa = *oinfo->oi_oa;
1941                 }
1942
1943                 rc = osc_brw_internal(cmd, exp, oinfo->oi_oa, oinfo->oi_md,
1944                                       pages_per_brw, ppga, oinfo->oi_capa);
1945
1946                 if (rc != 0)
1947                         break;
1948
1949                 page_count -= pages_per_brw;
1950                 ppga += pages_per_brw;
1951         }
1952
1953 out:
1954         osc_release_ppga(orig, page_count_orig);
1955
1956         if (saved_oa != NULL)
1957                 OBDO_FREE(saved_oa);
1958
1959         RETURN(rc);
1960 }
1961
1962 /* The companion to osc_enter_cache(), called when @oap is no longer part of
1963  * the dirty accounting.  Writeback completes or truncate happens before
1964  * writing starts.  Must be called with the loi lock held. */
1965 static void osc_exit_cache(struct client_obd *cli, struct osc_async_page *oap,
1966                            int sent)
1967 {
1968         osc_release_write_grant(cli, &oap->oap_brw_page, sent);
1969 }
1970
1971
1972 /* This maintains the lists of pending pages to read/write for a given object
1973  * (lop).  This is used by osc_check_rpcs->osc_next_loi() and loi_list_maint()
1974  * to quickly find objects that are ready to send an RPC. */
1975 static int lop_makes_rpc(struct client_obd *cli, struct loi_oap_pages *lop,
1976                          int cmd)
1977 {
1978         int optimal;
1979         ENTRY;
1980
1981         if (lop->lop_num_pending == 0)
1982                 RETURN(0);
1983
1984         /* if we have an invalid import we want to drain the queued pages
1985          * by forcing them through rpcs that immediately fail and complete
1986          * the pages.  recovery relies on this to empty the queued pages
1987          * before canceling the locks and evicting down the llite pages */
1988         if (cli->cl_import == NULL || cli->cl_import->imp_invalid)
1989                 RETURN(1);
1990
1991         /* stream rpcs in queue order as long as as there is an urgent page
1992          * queued.  this is our cheap solution for good batching in the case
1993          * where writepage marks some random page in the middle of the file
1994          * as urgent because of, say, memory pressure */
1995         if (!cfs_list_empty(&lop->lop_urgent)) {
1996                 CDEBUG(D_CACHE, "urgent request forcing RPC\n");
1997                 RETURN(1);
1998         }
1999         /* fire off rpcs when we have 'optimal' rpcs as tuned for the wire. */
2000         optimal = cli->cl_max_pages_per_rpc;
2001         if (cmd & OBD_BRW_WRITE) {
2002                 /* trigger a write rpc stream as long as there are dirtiers
2003                  * waiting for space.  as they're waiting, they're not going to
2004                  * create more pages to coalesce with what's waiting.. */
2005                 if (!cfs_list_empty(&cli->cl_cache_waiters)) {
2006                         CDEBUG(D_CACHE, "cache waiters forcing RPC\n");
2007                         RETURN(1);
2008                 }
2009                 /* +16 to avoid triggering rpcs that would want to include pages
2010                  * that are being queued but which can't be made ready until
2011                  * the queuer finishes with the page. this is a wart for
2012                  * llite::commit_write() */
2013                 optimal += 16;
2014         }
2015         if (lop->lop_num_pending >= optimal)
2016                 RETURN(1);
2017
2018         RETURN(0);
2019 }
2020
2021 static int lop_makes_hprpc(struct loi_oap_pages *lop)
2022 {
2023         struct osc_async_page *oap;
2024         ENTRY;
2025
2026         if (cfs_list_empty(&lop->lop_urgent))
2027                 RETURN(0);
2028
2029         oap = cfs_list_entry(lop->lop_urgent.next,
2030                          struct osc_async_page, oap_urgent_item);
2031
2032         if (oap->oap_async_flags & ASYNC_HP) {
2033                 CDEBUG(D_CACHE, "hp request forcing RPC\n");
2034                 RETURN(1);
2035         }
2036
2037         RETURN(0);
2038 }
2039
2040 static void on_list(cfs_list_t *item, cfs_list_t *list,
2041                     int should_be_on)
2042 {
2043         if (cfs_list_empty(item) && should_be_on)
2044                 cfs_list_add_tail(item, list);
2045         else if (!cfs_list_empty(item) && !should_be_on)
2046                 cfs_list_del_init(item);
2047 }
2048
2049 /* maintain the loi's cli list membership invariants so that osc_send_oap_rpc
2050  * can find pages to build into rpcs quickly */
2051 void loi_list_maint(struct client_obd *cli, struct lov_oinfo *loi)
2052 {
2053         if (lop_makes_hprpc(&loi->loi_write_lop) ||
2054             lop_makes_hprpc(&loi->loi_read_lop)) {
2055                 /* HP rpc */
2056                 on_list(&loi->loi_ready_item, &cli->cl_loi_ready_list, 0);
2057                 on_list(&loi->loi_hp_ready_item, &cli->cl_loi_hp_ready_list, 1);
2058         } else {
2059                 on_list(&loi->loi_hp_ready_item, &cli->cl_loi_hp_ready_list, 0);
2060                 on_list(&loi->loi_ready_item, &cli->cl_loi_ready_list,
2061                         lop_makes_rpc(cli, &loi->loi_write_lop, OBD_BRW_WRITE)||
2062                         lop_makes_rpc(cli, &loi->loi_read_lop, OBD_BRW_READ));
2063         }
2064
2065         on_list(&loi->loi_write_item, &cli->cl_loi_write_list,
2066                 loi->loi_write_lop.lop_num_pending);
2067
2068         on_list(&loi->loi_read_item, &cli->cl_loi_read_list,
2069                 loi->loi_read_lop.lop_num_pending);
2070 }
2071
2072 static void lop_update_pending(struct client_obd *cli,
2073                                struct loi_oap_pages *lop, int cmd, int delta)
2074 {
2075         lop->lop_num_pending += delta;
2076         if (cmd & OBD_BRW_WRITE)
2077                 cli->cl_pending_w_pages += delta;
2078         else
2079                 cli->cl_pending_r_pages += delta;
2080 }
2081
2082 /**
2083  * this is called when a sync waiter receives an interruption.  Its job is to
2084  * get the caller woken as soon as possible.  If its page hasn't been put in an
2085  * rpc yet it can dequeue immediately.  Otherwise it has to mark the rpc as
2086  * desiring interruption which will forcefully complete the rpc once the rpc
2087  * has timed out.
2088  */
2089 int osc_oap_interrupted(const struct lu_env *env, struct osc_async_page *oap)
2090 {
2091         struct loi_oap_pages *lop;
2092         struct lov_oinfo *loi;
2093         int rc = -EBUSY;
2094         ENTRY;
2095
2096         LASSERT(!oap->oap_interrupted);
2097         oap->oap_interrupted = 1;
2098
2099         /* ok, it's been put in an rpc. only one oap gets a request reference */
2100         if (oap->oap_request != NULL) {
2101                 ptlrpc_mark_interrupted(oap->oap_request);
2102                 ptlrpcd_wake(oap->oap_request);
2103                 ptlrpc_req_finished(oap->oap_request);
2104                 oap->oap_request = NULL;
2105         }
2106
2107         /*
2108          * page completion may be called only if ->cpo_prep() method was
2109          * executed by osc_io_submit(), that also adds page the to pending list
2110          */
2111         if (!cfs_list_empty(&oap->oap_pending_item)) {
2112                 cfs_list_del_init(&oap->oap_pending_item);
2113                 cfs_list_del_init(&oap->oap_urgent_item);
2114
2115                 loi = oap->oap_loi;
2116                 lop = (oap->oap_cmd & OBD_BRW_WRITE) ?
2117                         &loi->loi_write_lop : &loi->loi_read_lop;
2118                 lop_update_pending(oap->oap_cli, lop, oap->oap_cmd, -1);
2119                 loi_list_maint(oap->oap_cli, oap->oap_loi);
2120                 rc = oap->oap_caller_ops->ap_completion(env,
2121                                           oap->oap_caller_data,
2122                                           oap->oap_cmd, NULL, -EINTR);
2123         }
2124
2125         RETURN(rc);
2126 }
2127
2128 /* this is trying to propogate async writeback errors back up to the
2129  * application.  As an async write fails we record the error code for later if
2130  * the app does an fsync.  As long as errors persist we force future rpcs to be
2131  * sync so that the app can get a sync error and break the cycle of queueing
2132  * pages for which writeback will fail. */
2133 static void osc_process_ar(struct osc_async_rc *ar, __u64 xid,
2134                            int rc)
2135 {
2136         if (rc) {
2137                 if (!ar->ar_rc)
2138                         ar->ar_rc = rc;
2139
2140                 ar->ar_force_sync = 1;
2141                 ar->ar_min_xid = ptlrpc_sample_next_xid();
2142                 return;
2143
2144         }
2145
2146         if (ar->ar_force_sync && (xid >= ar->ar_min_xid))
2147                 ar->ar_force_sync = 0;
2148 }
2149
2150 void osc_oap_to_pending(struct osc_async_page *oap)
2151 {
2152         struct loi_oap_pages *lop;
2153
2154         if (oap->oap_cmd & OBD_BRW_WRITE)
2155                 lop = &oap->oap_loi->loi_write_lop;
2156         else
2157                 lop = &oap->oap_loi->loi_read_lop;
2158
2159         if (oap->oap_async_flags & ASYNC_HP)
2160                 cfs_list_add(&oap->oap_urgent_item, &lop->lop_urgent);
2161         else if (oap->oap_async_flags & ASYNC_URGENT)
2162                 cfs_list_add_tail(&oap->oap_urgent_item, &lop->lop_urgent);
2163         cfs_list_add_tail(&oap->oap_pending_item, &lop->lop_pending);
2164         lop_update_pending(oap->oap_cli, lop, oap->oap_cmd, 1);
2165 }
2166
2167 /* this must be called holding the loi list lock to give coverage to exit_cache,
2168  * async_flag maintenance, and oap_request */
2169 static void osc_ap_completion(const struct lu_env *env,
2170                               struct client_obd *cli, struct obdo *oa,
2171                               struct osc_async_page *oap, int sent, int rc)
2172 {
2173         __u64 xid = 0;
2174
2175         ENTRY;
2176         if (oap->oap_request != NULL) {
2177                 xid = ptlrpc_req_xid(oap->oap_request);
2178                 ptlrpc_req_finished(oap->oap_request);
2179                 oap->oap_request = NULL;
2180         }
2181
2182         cfs_spin_lock(&oap->oap_lock);
2183         oap->oap_async_flags = 0;
2184         cfs_spin_unlock(&oap->oap_lock);
2185         oap->oap_interrupted = 0;
2186
2187         if (oap->oap_cmd & OBD_BRW_WRITE) {
2188                 osc_process_ar(&cli->cl_ar, xid, rc);
2189                 osc_process_ar(&oap->oap_loi->loi_ar, xid, rc);
2190         }
2191
2192         if (rc == 0 && oa != NULL) {
2193                 if (oa->o_valid & OBD_MD_FLBLOCKS)
2194                         oap->oap_loi->loi_lvb.lvb_blocks = oa->o_blocks;
2195                 if (oa->o_valid & OBD_MD_FLMTIME)
2196                         oap->oap_loi->loi_lvb.lvb_mtime = oa->o_mtime;
2197                 if (oa->o_valid & OBD_MD_FLATIME)
2198                         oap->oap_loi->loi_lvb.lvb_atime = oa->o_atime;
2199                 if (oa->o_valid & OBD_MD_FLCTIME)
2200                         oap->oap_loi->loi_lvb.lvb_ctime = oa->o_ctime;
2201         }
2202
2203         rc = oap->oap_caller_ops->ap_completion(env, oap->oap_caller_data,
2204                                                 oap->oap_cmd, oa, rc);
2205
2206         /* cl_page_completion() drops PG_locked. so, a new I/O on the page could
2207          * start, but OSC calls it under lock and thus we can add oap back to
2208          * pending safely */
2209         if (rc)
2210                 /* upper layer wants to leave the page on pending queue */
2211                 osc_oap_to_pending(oap);
2212         else
2213                 osc_exit_cache(cli, oap, sent);
2214         EXIT;
2215 }
2216
2217 static int brw_interpret(const struct lu_env *env,
2218                          struct ptlrpc_request *req, void *data, int rc)
2219 {
2220         struct osc_brw_async_args *aa = data;
2221         struct client_obd *cli;
2222         int async;
2223         ENTRY;
2224
2225         rc = osc_brw_fini_request(req, rc);
2226         CDEBUG(D_INODE, "request %p aa %p rc %d\n", req, aa, rc);
2227         if (osc_recoverable_error(rc)) {
2228                 /* Only retry once for mmaped files since the mmaped page
2229                  * might be modified at anytime. We have to retry at least
2230                  * once in case there WAS really a corruption of the page
2231                  * on the network, that was not caused by mmap() modifying
2232                  * the page. Bug11742 */
2233                 if ((rc == -EAGAIN) && (aa->aa_resends > 0) &&
2234                     aa->aa_oa->o_valid & OBD_MD_FLFLAGS &&
2235                     aa->aa_oa->o_flags & OBD_FL_MMAP) {
2236                         rc = 0;
2237                 } else {
2238                         rc = osc_brw_redo_request(req, aa);
2239                         if (rc == 0)
2240                                 RETURN(0);
2241                 }
2242         }
2243
2244         if (aa->aa_ocapa) {
2245                 capa_put(aa->aa_ocapa);
2246                 aa->aa_ocapa = NULL;
2247         }
2248
2249         cli = aa->aa_cli;
2250
2251         client_obd_list_lock(&cli->cl_loi_list_lock);
2252
2253         /* We need to decrement before osc_ap_completion->osc_wake_cache_waiters
2254          * is called so we know whether to go to sync BRWs or wait for more
2255          * RPCs to complete */
2256         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE)
2257                 cli->cl_w_in_flight--;
2258         else
2259                 cli->cl_r_in_flight--;
2260
2261         async = cfs_list_empty(&aa->aa_oaps);
2262         if (!async) { /* from osc_send_oap_rpc() */
2263                 struct osc_async_page *oap, *tmp;
2264                 /* the caller may re-use the oap after the completion call so
2265                  * we need to clean it up a little */
2266                 cfs_list_for_each_entry_safe(oap, tmp, &aa->aa_oaps,
2267                                              oap_rpc_item) {
2268                         cfs_list_del_init(&oap->oap_rpc_item);
2269                         osc_ap_completion(env, cli, aa->aa_oa, oap, 1, rc);
2270                 }
2271                 OBDO_FREE(aa->aa_oa);
2272         } else { /* from async_internal() */
2273                 obd_count i;
2274                 for (i = 0; i < aa->aa_page_count; i++)
2275                         osc_release_write_grant(aa->aa_cli, aa->aa_ppga[i], 1);
2276         }
2277         osc_wake_cache_waiters(cli);
2278         osc_check_rpcs(env, cli);
2279         client_obd_list_unlock(&cli->cl_loi_list_lock);
2280         if (!async)
2281                 cl_req_completion(env, aa->aa_clerq, rc < 0 ? rc :
2282                                   req->rq_bulk->bd_nob_transferred);
2283         osc_release_ppga(aa->aa_ppga, aa->aa_page_count);
2284         ptlrpc_lprocfs_brw(req, req->rq_bulk->bd_nob_transferred);
2285
2286         RETURN(rc);
2287 }
2288
2289 static struct ptlrpc_request *osc_build_req(const struct lu_env *env,
2290                                             struct client_obd *cli,
2291                                             cfs_list_t *rpc_list,
2292                                             int page_count, int cmd)
2293 {
2294         struct ptlrpc_request *req;
2295         struct brw_page **pga = NULL;
2296         struct osc_brw_async_args *aa;
2297         struct obdo *oa = NULL;
2298         const struct obd_async_page_ops *ops = NULL;
2299         void *caller_data = NULL;
2300         struct osc_async_page *oap;
2301         struct osc_async_page *tmp;
2302         struct ost_body *body;
2303         struct cl_req *clerq = NULL;
2304         enum cl_req_type crt = (cmd & OBD_BRW_WRITE) ? CRT_WRITE : CRT_READ;
2305         struct ldlm_lock *lock = NULL;
2306         struct cl_req_attr crattr;
2307         int i, rc, mpflag = 0;
2308
2309         ENTRY;
2310         LASSERT(!cfs_list_empty(rpc_list));
2311
2312         if (cmd & OBD_BRW_MEMALLOC)
2313                 mpflag = cfs_memory_pressure_get_and_set();
2314
2315         memset(&crattr, 0, sizeof crattr);
2316         OBD_ALLOC(pga, sizeof(*pga) * page_count);
2317         if (pga == NULL)
2318                 GOTO(out, req = ERR_PTR(-ENOMEM));
2319
2320         OBDO_ALLOC(oa);
2321         if (oa == NULL)
2322                 GOTO(out, req = ERR_PTR(-ENOMEM));
2323
2324         i = 0;
2325         cfs_list_for_each_entry(oap, rpc_list, oap_rpc_item) {
2326                 struct cl_page *page = osc_oap2cl_page(oap);
2327                 if (ops == NULL) {
2328                         ops = oap->oap_caller_ops;
2329                         caller_data = oap->oap_caller_data;
2330
2331                         clerq = cl_req_alloc(env, page, crt,
2332                                              1 /* only 1-object rpcs for
2333                                                 * now */);
2334                         if (IS_ERR(clerq))
2335                                 GOTO(out, req = (void *)clerq);
2336                         lock = oap->oap_ldlm_lock;
2337                 }
2338                 pga[i] = &oap->oap_brw_page;
2339                 pga[i]->off = oap->oap_obj_off + oap->oap_page_off;
2340                 CDEBUG(0, "put page %p index %lu oap %p flg %x to pga\n",
2341                        pga[i]->pg, cfs_page_index(oap->oap_page), oap, pga[i]->flag);
2342                 i++;
2343                 cl_req_page_add(env, clerq, page);
2344         }
2345
2346         /* always get the data for the obdo for the rpc */
2347         LASSERT(ops != NULL);
2348         crattr.cra_oa = oa;
2349         crattr.cra_capa = NULL;
2350         cl_req_attr_set(env, clerq, &crattr, ~0ULL);
2351         if (lock) {
2352                 oa->o_handle = lock->l_remote_handle;
2353                 oa->o_valid |= OBD_MD_FLHANDLE;
2354         }
2355
2356         rc = cl_req_prep(env, clerq);
2357         if (rc != 0) {
2358                 CERROR("cl_req_prep failed: %d\n", rc);
2359                 GOTO(out, req = ERR_PTR(rc));
2360         }
2361
2362         sort_brw_pages(pga, page_count);
2363         rc = osc_brw_prep_request(cmd, cli, oa, NULL, page_count,
2364                                   pga, &req, crattr.cra_capa, 1, 0);
2365         if (rc != 0) {
2366                 CERROR("prep_req failed: %d\n", rc);
2367                 GOTO(out, req = ERR_PTR(rc));
2368         }
2369
2370         if (cmd & OBD_BRW_MEMALLOC)
2371                 req->rq_memalloc = 1;
2372
2373         /* Need to update the timestamps after the request is built in case
2374          * we race with setattr (locally or in queue at OST).  If OST gets
2375          * later setattr before earlier BRW (as determined by the request xid),
2376          * the OST will not use BRW timestamps.  Sadly, there is no obvious
2377          * way to do this in a single call.  bug 10150 */
2378         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
2379         cl_req_attr_set(env, clerq, &crattr,
2380                         OBD_MD_FLMTIME|OBD_MD_FLCTIME|OBD_MD_FLATIME);
2381
2382         CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
2383         aa = ptlrpc_req_async_args(req);
2384         CFS_INIT_LIST_HEAD(&aa->aa_oaps);
2385         cfs_list_splice(rpc_list, &aa->aa_oaps);
2386         CFS_INIT_LIST_HEAD(rpc_list);
2387         aa->aa_clerq = clerq;
2388 out:
2389         if (cmd & OBD_BRW_MEMALLOC)
2390                 cfs_memory_pressure_restore(mpflag);
2391
2392         capa_put(crattr.cra_capa);
2393         if (IS_ERR(req)) {
2394                 if (oa)
2395                         OBDO_FREE(oa);
2396                 if (pga)
2397                         OBD_FREE(pga, sizeof(*pga) * page_count);
2398                 /* this should happen rarely and is pretty bad, it makes the
2399                  * pending list not follow the dirty order */
2400                 client_obd_list_lock(&cli->cl_loi_list_lock);
2401                 cfs_list_for_each_entry_safe(oap, tmp, rpc_list, oap_rpc_item) {
2402                         cfs_list_del_init(&oap->oap_rpc_item);
2403
2404                         /* queued sync pages can be torn down while the pages
2405                          * were between the pending list and the rpc */
2406                         if (oap->oap_interrupted) {
2407                                 CDEBUG(D_INODE, "oap %p interrupted\n", oap);
2408                                 osc_ap_completion(env, cli, NULL, oap, 0,
2409                                                   oap->oap_count);
2410                                 continue;
2411                         }
2412                         osc_ap_completion(env, cli, NULL, oap, 0, PTR_ERR(req));
2413                 }
2414                 if (clerq && !IS_ERR(clerq))
2415                         cl_req_completion(env, clerq, PTR_ERR(req));
2416         }
2417         RETURN(req);
2418 }
2419
2420 /**
2421  * prepare pages for ASYNC io and put pages in send queue.
2422  *
2423  * \param cmd OBD_BRW_* macroses
2424  * \param lop pending pages
2425  *
2426  * \return zero if no page added to send queue.
2427  * \return 1 if pages successfully added to send queue.
2428  * \return negative on errors.
2429  */
2430 static int
2431 osc_send_oap_rpc(const struct lu_env *env, struct client_obd *cli,
2432                  struct lov_oinfo *loi,
2433                  int cmd, struct loi_oap_pages *lop)
2434 {
2435         struct ptlrpc_request *req;
2436         obd_count page_count = 0;
2437         struct osc_async_page *oap = NULL, *tmp;
2438         struct osc_brw_async_args *aa;
2439         const struct obd_async_page_ops *ops;
2440         CFS_LIST_HEAD(rpc_list);
2441         int srvlock = 0, mem_tight = 0;
2442         struct cl_object *clob = NULL;
2443         obd_off starting_offset = OBD_OBJECT_EOF;
2444         unsigned int ending_offset;
2445         int starting_page_off = 0;
2446         ENTRY;
2447
2448         /* ASYNC_HP pages first. At present, when the lock the pages is
2449          * to be canceled, the pages covered by the lock will be sent out
2450          * with ASYNC_HP. We have to send out them as soon as possible. */
2451         cfs_list_for_each_entry_safe(oap, tmp, &lop->lop_urgent, oap_urgent_item) {
2452                 if (oap->oap_async_flags & ASYNC_HP)
2453                         cfs_list_move(&oap->oap_pending_item, &lop->lop_pending);
2454                 if (++page_count >= cli->cl_max_pages_per_rpc)
2455                         break;
2456         }
2457         page_count = 0;
2458
2459         /* first we find the pages we're allowed to work with */
2460         cfs_list_for_each_entry_safe(oap, tmp, &lop->lop_pending,
2461                                      oap_pending_item) {
2462                 ops = oap->oap_caller_ops;
2463
2464                 LASSERTF(oap->oap_magic == OAP_MAGIC, "Bad oap magic: oap %p, "
2465                          "magic 0x%x\n", oap, oap->oap_magic);
2466
2467                 if (clob == NULL) {
2468                         /* pin object in memory, so that completion call-backs
2469                          * can be safely called under client_obd_list lock. */
2470                         clob = osc_oap2cl_page(oap)->cp_obj;
2471                         cl_object_get(clob);
2472                 }
2473
2474                 if (page_count != 0 &&
2475                     srvlock != !!(oap->oap_brw_flags & OBD_BRW_SRVLOCK)) {
2476                         CDEBUG(D_PAGE, "SRVLOCK flag mismatch,"
2477                                " oap %p, page %p, srvlock %u\n",
2478                                oap, oap->oap_brw_page.pg, (unsigned)!srvlock);
2479                         break;
2480                 }
2481
2482                 /* If there is a gap at the start of this page, it can't merge
2483                  * with any previous page, so we'll hand the network a
2484                  * "fragmented" page array that it can't transfer in 1 RDMA */
2485                 if (oap->oap_obj_off < starting_offset) {
2486                         if (starting_page_off != 0)
2487                                 break;
2488
2489                         starting_page_off = oap->oap_page_off;
2490                         starting_offset = oap->oap_obj_off + starting_page_off;
2491                 } else if (oap->oap_page_off != 0)
2492                         break;
2493
2494                 /* in llite being 'ready' equates to the page being locked
2495                  * until completion unlocks it.  commit_write submits a page
2496                  * as not ready because its unlock will happen unconditionally
2497                  * as the call returns.  if we race with commit_write giving
2498                  * us that page we don't want to create a hole in the page
2499                  * stream, so we stop and leave the rpc to be fired by
2500                  * another dirtier or kupdated interval (the not ready page
2501                  * will still be on the dirty list).  we could call in
2502                  * at the end of ll_file_write to process the queue again. */
2503                 if (!(oap->oap_async_flags & ASYNC_READY)) {
2504                         int rc = ops->ap_make_ready(env, oap->oap_caller_data,
2505                                                     cmd);
2506                         if (rc < 0)
2507                                 CDEBUG(D_INODE, "oap %p page %p returned %d "
2508                                                 "instead of ready\n", oap,
2509                                                 oap->oap_page, rc);
2510                         switch (rc) {
2511                         case -EAGAIN:
2512                                 /* llite is telling us that the page is still
2513                                  * in commit_write and that we should try
2514                                  * and put it in an rpc again later.  we
2515                                  * break out of the loop so we don't create
2516                                  * a hole in the sequence of pages in the rpc
2517                                  * stream.*/
2518                                 oap = NULL;
2519                                 break;
2520                         case -EINTR:
2521                                 /* the io isn't needed.. tell the checks
2522                                  * below to complete the rpc with EINTR */
2523                                 cfs_spin_lock(&oap->oap_lock);
2524                                 oap->oap_async_flags |= ASYNC_COUNT_STABLE;
2525                                 cfs_spin_unlock(&oap->oap_lock);
2526                                 oap->oap_count = -EINTR;
2527                                 break;
2528                         case 0:
2529                                 cfs_spin_lock(&oap->oap_lock);
2530                                 oap->oap_async_flags |= ASYNC_READY;
2531                                 cfs_spin_unlock(&oap->oap_lock);
2532                                 break;
2533                         default:
2534                                 LASSERTF(0, "oap %p page %p returned %d "
2535                                             "from make_ready\n", oap,
2536                                             oap->oap_page, rc);
2537                                 break;
2538                         }
2539                 }
2540                 if (oap == NULL)
2541                         break;
2542
2543                 /* take the page out of our book-keeping */
2544                 cfs_list_del_init(&oap->oap_pending_item);
2545                 lop_update_pending(cli, lop, cmd, -1);
2546                 cfs_list_del_init(&oap->oap_urgent_item);
2547
2548                 /* ask the caller for the size of the io as the rpc leaves. */
2549                 if (!(oap->oap_async_flags & ASYNC_COUNT_STABLE)) {
2550                         oap->oap_count =
2551                                 ops->ap_refresh_count(env, oap->oap_caller_data,
2552                                                       cmd);
2553                         LASSERT(oap->oap_page_off + oap->oap_count <= CFS_PAGE_SIZE);
2554                 }
2555                 if (oap->oap_count <= 0) {
2556                         CDEBUG(D_CACHE, "oap %p count %d, completing\n", oap,
2557                                oap->oap_count);
2558                         osc_ap_completion(env, cli, NULL,
2559                                           oap, 0, oap->oap_count);
2560                         continue;
2561                 }
2562
2563                 /* now put the page back in our accounting */
2564                 cfs_list_add_tail(&oap->oap_rpc_item, &rpc_list);
2565                 if (page_count++ == 0)
2566                         srvlock = !!(oap->oap_brw_flags & OBD_BRW_SRVLOCK);
2567
2568                 if (oap->oap_brw_flags & OBD_BRW_MEMALLOC)
2569                         mem_tight = 1;
2570
2571                 /* End on a PTLRPC_MAX_BRW_SIZE boundary.  We want full-sized
2572                  * RPCs aligned on PTLRPC_MAX_BRW_SIZE boundaries to help reads
2573                  * have the same alignment as the initial writes that allocated
2574                  * extents on the server. */
2575                 ending_offset = oap->oap_obj_off + oap->oap_page_off +
2576                                 oap->oap_count;
2577                 if (!(ending_offset & (PTLRPC_MAX_BRW_SIZE - 1)))
2578                         break;
2579
2580                 if (page_count >= cli->cl_max_pages_per_rpc)
2581                         break;
2582
2583                 /* If there is a gap at the end of this page, it can't merge
2584                  * with any subsequent pages, so we'll hand the network a
2585                  * "fragmented" page array that it can't transfer in 1 RDMA */
2586                 if (oap->oap_page_off + oap->oap_count < CFS_PAGE_SIZE)
2587                         break;
2588         }
2589
2590         osc_wake_cache_waiters(cli);
2591
2592         loi_list_maint(cli, loi);
2593
2594         client_obd_list_unlock(&cli->cl_loi_list_lock);
2595
2596         if (clob != NULL)
2597                 cl_object_put(env, clob);
2598
2599         if (page_count == 0) {
2600                 client_obd_list_lock(&cli->cl_loi_list_lock);
2601                 RETURN(0);
2602         }
2603
2604         req = osc_build_req(env, cli, &rpc_list, page_count,
2605                             mem_tight ? (cmd | OBD_BRW_MEMALLOC) : cmd);
2606         if (IS_ERR(req)) {
2607                 LASSERT(cfs_list_empty(&rpc_list));
2608                 loi_list_maint(cli, loi);
2609                 RETURN(PTR_ERR(req));
2610         }
2611
2612         aa = ptlrpc_req_async_args(req);
2613
2614         starting_offset &= PTLRPC_MAX_BRW_SIZE - 1;
2615         if (cmd == OBD_BRW_READ) {
2616                 lprocfs_oh_tally_log2(&cli->cl_read_page_hist, page_count);
2617                 lprocfs_oh_tally(&cli->cl_read_rpc_hist, cli->cl_r_in_flight);
2618                 lprocfs_oh_tally_log2(&cli->cl_read_offset_hist,
2619                                       (starting_offset >> CFS_PAGE_SHIFT) + 1);
2620         } else {
2621                 lprocfs_oh_tally_log2(&cli->cl_write_page_hist, page_count);
2622                 lprocfs_oh_tally(&cli->cl_write_rpc_hist,
2623                                  cli->cl_w_in_flight);
2624                 lprocfs_oh_tally_log2(&cli->cl_write_offset_hist,
2625                                       (starting_offset >> CFS_PAGE_SHIFT) + 1);
2626         }
2627
2628         client_obd_list_lock(&cli->cl_loi_list_lock);
2629
2630         if (cmd == OBD_BRW_READ)
2631                 cli->cl_r_in_flight++;
2632         else
2633                 cli->cl_w_in_flight++;
2634
2635         /* queued sync pages can be torn down while the pages
2636          * were between the pending list and the rpc */
2637         tmp = NULL;
2638         cfs_list_for_each_entry(oap, &aa->aa_oaps, oap_rpc_item) {
2639                 /* only one oap gets a request reference */
2640                 if (tmp == NULL)
2641                         tmp = oap;
2642                 if (oap->oap_interrupted && !req->rq_intr) {
2643                         CDEBUG(D_INODE, "oap %p in req %p interrupted\n",
2644                                oap, req);
2645                         ptlrpc_mark_interrupted(req);
2646                 }
2647         }
2648         if (tmp != NULL)
2649                 tmp->oap_request = ptlrpc_request_addref(req);
2650
2651         DEBUG_REQ(D_INODE, req, "%d pages, aa %p. now %dr/%dw in flight",
2652                   page_count, aa, cli->cl_r_in_flight, cli->cl_w_in_flight);
2653
2654         req->rq_interpret_reply = brw_interpret;
2655
2656         /* XXX: Maybe the caller can check the RPC bulk descriptor to see which
2657          *      CPU/NUMA node the majority of pages were allocated on, and try
2658          *      to assign the async RPC to the CPU core (PDL_POLICY_PREFERRED)
2659          *      to reduce cross-CPU memory traffic.
2660          *
2661          *      But on the other hand, we expect that multiple ptlrpcd threads
2662          *      and the initial write sponsor can run in parallel, especially
2663          *      when data checksum is enabled, which is CPU-bound operation and
2664          *      single ptlrpcd thread cannot process in time. So more ptlrpcd
2665          *      threads sharing BRW load (with PDL_POLICY_ROUND) seems better.
2666          */
2667         ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
2668         RETURN(1);
2669 }
2670
2671 #define LOI_DEBUG(LOI, STR, args...)                                     \
2672         CDEBUG(D_INODE, "loi ready %d wr %d:%d rd %d:%d " STR,           \
2673                !cfs_list_empty(&(LOI)->loi_ready_item) ||                \
2674                !cfs_list_empty(&(LOI)->loi_hp_ready_item),               \
2675                (LOI)->loi_write_lop.lop_num_pending,                     \
2676                !cfs_list_empty(&(LOI)->loi_write_lop.lop_urgent),        \
2677                (LOI)->loi_read_lop.lop_num_pending,                      \
2678                !cfs_list_empty(&(LOI)->loi_read_lop.lop_urgent),         \
2679                args)                                                     \
2680
2681 /* This is called by osc_check_rpcs() to find which objects have pages that
2682  * we could be sending.  These lists are maintained by lop_makes_rpc(). */
2683 struct lov_oinfo *osc_next_loi(struct client_obd *cli)
2684 {
2685         ENTRY;
2686
2687         /* First return objects that have blocked locks so that they
2688          * will be flushed quickly and other clients can get the lock,
2689          * then objects which have pages ready to be stuffed into RPCs */
2690         if (!cfs_list_empty(&cli->cl_loi_hp_ready_list))
2691                 RETURN(cfs_list_entry(cli->cl_loi_hp_ready_list.next,
2692                                       struct lov_oinfo, loi_hp_ready_item));
2693         if (!cfs_list_empty(&cli->cl_loi_ready_list))
2694                 RETURN(cfs_list_entry(cli->cl_loi_ready_list.next,
2695                                       struct lov_oinfo, loi_ready_item));
2696
2697         /* then if we have cache waiters, return all objects with queued
2698          * writes.  This is especially important when many small files
2699          * have filled up the cache and not been fired into rpcs because
2700          * they don't pass the nr_pending/object threshhold */
2701         if (!cfs_list_empty(&cli->cl_cache_waiters) &&
2702             !cfs_list_empty(&cli->cl_loi_write_list))
2703                 RETURN(cfs_list_entry(cli->cl_loi_write_list.next,
2704                                       struct lov_oinfo, loi_write_item));
2705
2706         /* then return all queued objects when we have an invalid import
2707          * so that they get flushed */
2708         if (cli->cl_import == NULL || cli->cl_import->imp_invalid) {
2709                 if (!cfs_list_empty(&cli->cl_loi_write_list))
2710                         RETURN(cfs_list_entry(cli->cl_loi_write_list.next,
2711                                               struct lov_oinfo,
2712                                               loi_write_item));
2713                 if (!cfs_list_empty(&cli->cl_loi_read_list))
2714                         RETURN(cfs_list_entry(cli->cl_loi_read_list.next,
2715                                               struct lov_oinfo, loi_read_item));
2716         }
2717         RETURN(NULL);
2718 }
2719
2720 static int osc_max_rpc_in_flight(struct client_obd *cli, struct lov_oinfo *loi)
2721 {
2722         struct osc_async_page *oap;
2723         int hprpc = 0;
2724
2725         if (!cfs_list_empty(&loi->loi_write_lop.lop_urgent)) {
2726                 oap = cfs_list_entry(loi->loi_write_lop.lop_urgent.next,
2727                                      struct osc_async_page, oap_urgent_item);
2728                 hprpc = !!(oap->oap_async_flags & ASYNC_HP);
2729         }
2730
2731         if (!hprpc && !cfs_list_empty(&loi->loi_read_lop.lop_urgent)) {
2732                 oap = cfs_list_entry(loi->loi_read_lop.lop_urgent.next,
2733                                      struct osc_async_page, oap_urgent_item);
2734                 hprpc = !!(oap->oap_async_flags & ASYNC_HP);
2735         }
2736
2737         return rpcs_in_flight(cli) >= cli->cl_max_rpcs_in_flight + hprpc;
2738 }
2739
2740 /* called with the loi list lock held */
2741 void osc_check_rpcs(const struct lu_env *env, struct client_obd *cli)
2742 {
2743         struct lov_oinfo *loi;
2744         int rc = 0, race_counter = 0;
2745         ENTRY;
2746
2747         while ((loi = osc_next_loi(cli)) != NULL) {
2748                 LOI_DEBUG(loi, "%lu in flight\n", rpcs_in_flight(cli));
2749
2750                 if (osc_max_rpc_in_flight(cli, loi))
2751                         break;
2752
2753                 /* attempt some read/write balancing by alternating between
2754                  * reads and writes in an object.  The makes_rpc checks here
2755                  * would be redundant if we were getting read/write work items
2756                  * instead of objects.  we don't want send_oap_rpc to drain a
2757                  * partial read pending queue when we're given this object to
2758                  * do io on writes while there are cache waiters */
2759                 if (lop_makes_rpc(cli, &loi->loi_write_lop, OBD_BRW_WRITE)) {
2760                         rc = osc_send_oap_rpc(env, cli, loi, OBD_BRW_WRITE,
2761                                               &loi->loi_write_lop);
2762                         if (rc < 0) {
2763                                 CERROR("Write request failed with %d\n", rc);
2764
2765                                 /* osc_send_oap_rpc failed, mostly because of
2766                                  * memory pressure.
2767                                  *
2768                                  * It can't break here, because if:
2769                                  *  - a page was submitted by osc_io_submit, so
2770                                  *    page locked;
2771                                  *  - no request in flight
2772                                  *  - no subsequent request
2773                                  * The system will be in live-lock state,
2774                                  * because there is no chance to call
2775                                  * osc_io_unplug() and osc_check_rpcs() any
2776                                  * more. pdflush can't help in this case,
2777                                  * because it might be blocked at grabbing
2778                                  * the page lock as we mentioned.
2779                                  *
2780                                  * Anyway, continue to drain pages. */
2781                                 /* break; */
2782                         }
2783
2784                         if (rc > 0)
2785                                 race_counter = 0;
2786                         else if (rc == 0)
2787                                 race_counter++;
2788                 }
2789                 if (lop_makes_rpc(cli, &loi->loi_read_lop, OBD_BRW_READ)) {
2790                         rc = osc_send_oap_rpc(env, cli, loi, OBD_BRW_READ,
2791                                               &loi->loi_read_lop);
2792                         if (rc < 0)
2793                                 CERROR("Read request failed with %d\n", rc);
2794
2795                         if (rc > 0)
2796                                 race_counter = 0;
2797                         else if (rc == 0)
2798                                 race_counter++;
2799                 }
2800
2801                 /* attempt some inter-object balancing by issuing rpcs
2802                  * for each object in turn */
2803                 if (!cfs_list_empty(&loi->loi_hp_ready_item))
2804                         cfs_list_del_init(&loi->loi_hp_ready_item);
2805                 if (!cfs_list_empty(&loi->loi_ready_item))
2806                         cfs_list_del_init(&loi->loi_ready_item);
2807                 if (!cfs_list_empty(&loi->loi_write_item))
2808                         cfs_list_del_init(&loi->loi_write_item);
2809                 if (!cfs_list_empty(&loi->loi_read_item))
2810                         cfs_list_del_init(&loi->loi_read_item);
2811
2812                 loi_list_maint(cli, loi);
2813
2814                 /* send_oap_rpc fails with 0 when make_ready tells it to
2815                  * back off.  llite's make_ready does this when it tries
2816                  * to lock a page queued for write that is already locked.
2817                  * we want to try sending rpcs from many objects, but we
2818                  * don't want to spin failing with 0.  */
2819                 if (race_counter == 10)
2820                         break;
2821         }
2822         EXIT;
2823 }
2824
2825 /* we're trying to queue a page in the osc so we're subject to the
2826  * 'cl_dirty_max' limit on the number of pages that can be queued in the osc.
2827  * If the osc's queued pages are already at that limit, then we want to sleep
2828  * until there is space in the osc's queue for us.  We also may be waiting for
2829  * write credits from the OST if there are RPCs in flight that may return some
2830  * before we fall back to sync writes.
2831  *
2832  * We need this know our allocation was granted in the presence of signals */
2833 static int ocw_granted(struct client_obd *cli, struct osc_cache_waiter *ocw)
2834 {
2835         int rc;
2836         ENTRY;
2837         client_obd_list_lock(&cli->cl_loi_list_lock);
2838         rc = cfs_list_empty(&ocw->ocw_entry) || rpcs_in_flight(cli) == 0;
2839         client_obd_list_unlock(&cli->cl_loi_list_lock);
2840         RETURN(rc);
2841 };
2842
2843 /**
2844  * Non-blocking version of osc_enter_cache() that consumes grant only when it
2845  * is available.
2846  */
2847 int osc_enter_cache_try(const struct lu_env *env,
2848                         struct client_obd *cli, struct lov_oinfo *loi,
2849                         struct osc_async_page *oap, int transient)
2850 {
2851         int has_grant;
2852
2853         has_grant = cli->cl_avail_grant >= CFS_PAGE_SIZE;
2854         if (has_grant) {
2855                 osc_consume_write_grant(cli, &oap->oap_brw_page);
2856                 if (transient) {
2857                         cli->cl_dirty_transit += CFS_PAGE_SIZE;
2858                         cfs_atomic_inc(&obd_dirty_transit_pages);
2859                         oap->oap_brw_flags |= OBD_BRW_NOCACHE;
2860                 }
2861         }
2862         return has_grant;
2863 }
2864
2865 /* Caller must hold loi_list_lock - we drop/regain it if we need to wait for
2866  * grant or cache space. */
2867 static int osc_enter_cache(const struct lu_env *env,
2868                            struct client_obd *cli, struct lov_oinfo *loi,
2869                            struct osc_async_page *oap)
2870 {
2871         struct osc_cache_waiter ocw;
2872         struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
2873
2874         ENTRY;
2875
2876         CDEBUG(D_CACHE, "dirty: %ld/%d dirty_max: %ld/%d dropped: %lu "
2877                "grant: %lu\n", cli->cl_dirty, cfs_atomic_read(&obd_dirty_pages),
2878                cli->cl_dirty_max, obd_max_dirty_pages,
2879                cli->cl_lost_grant, cli->cl_avail_grant);
2880
2881         /* force the caller to try sync io.  this can jump the list
2882          * of queued writes and create a discontiguous rpc stream */
2883         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_NO_GRANT) ||
2884             cli->cl_dirty_max < CFS_PAGE_SIZE     ||
2885             cli->cl_ar.ar_force_sync || loi->loi_ar.ar_force_sync)
2886                 RETURN(-EDQUOT);
2887
2888         /* Hopefully normal case - cache space and write credits available */
2889         if (cli->cl_dirty + CFS_PAGE_SIZE <= cli->cl_dirty_max &&
2890             cfs_atomic_read(&obd_dirty_pages) + 1 <= obd_max_dirty_pages &&
2891             osc_enter_cache_try(env, cli, loi, oap, 0))
2892                 RETURN(0);
2893
2894         /* It is safe to block as a cache waiter as long as there is grant
2895          * space available or the hope of additional grant being returned
2896          * when an in flight write completes.  Using the write back cache
2897          * if possible is preferable to sending the data synchronously
2898          * because write pages can then be merged in to large requests.
2899          * The addition of this cache waiter will causing pending write
2900          * pages to be sent immediately. */
2901         if (cli->cl_w_in_flight || cli->cl_avail_grant >= CFS_PAGE_SIZE) {
2902                 cfs_list_add_tail(&ocw.ocw_entry, &cli->cl_cache_waiters);
2903                 cfs_waitq_init(&ocw.ocw_waitq);
2904                 ocw.ocw_oap = oap;
2905                 ocw.ocw_rc = 0;
2906
2907                 loi_list_maint(cli, loi);
2908                 osc_check_rpcs(env, cli);
2909                 client_obd_list_unlock(&cli->cl_loi_list_lock);
2910
2911                 CDEBUG(D_CACHE, "sleeping for cache space\n");
2912                 l_wait_event(ocw.ocw_waitq, ocw_granted(cli, &ocw), &lwi);
2913
2914                 client_obd_list_lock(&cli->cl_loi_list_lock);
2915                 if (!cfs_list_empty(&ocw.ocw_entry)) {
2916                         cfs_list_del(&ocw.ocw_entry);
2917                         RETURN(-EINTR);
2918                 }
2919                 RETURN(ocw.ocw_rc);
2920         }
2921
2922         RETURN(-EDQUOT);
2923 }
2924
2925
2926 int osc_prep_async_page(struct obd_export *exp, struct lov_stripe_md *lsm,
2927                         struct lov_oinfo *loi, cfs_page_t *page,
2928                         obd_off offset, const struct obd_async_page_ops *ops,
2929                         void *data, void **res, int nocache,
2930                         struct lustre_handle *lockh)
2931 {
2932         struct osc_async_page *oap;
2933
2934         ENTRY;
2935
2936         if (!page)
2937                 return cfs_size_round(sizeof(*oap));
2938
2939         oap = *res;
2940         oap->oap_magic = OAP_MAGIC;
2941         oap->oap_cli = &exp->exp_obd->u.cli;
2942         oap->oap_loi = loi;
2943
2944         oap->oap_caller_ops = ops;
2945         oap->oap_caller_data = data;
2946
2947         oap->oap_page = page;
2948         oap->oap_obj_off = offset;
2949         if (!client_is_remote(exp) &&
2950             cfs_capable(CFS_CAP_SYS_RESOURCE))
2951                 oap->oap_brw_flags = OBD_BRW_NOQUOTA;
2952
2953         LASSERT(!(offset & ~CFS_PAGE_MASK));
2954
2955         CFS_INIT_LIST_HEAD(&oap->oap_pending_item);
2956         CFS_INIT_LIST_HEAD(&oap->oap_urgent_item);
2957         CFS_INIT_LIST_HEAD(&oap->oap_rpc_item);
2958         CFS_INIT_LIST_HEAD(&oap->oap_page_list);
2959
2960         cfs_spin_lock_init(&oap->oap_lock);
2961         CDEBUG(D_CACHE, "oap %p page %p obj off "LPU64"\n", oap, page, offset);
2962         RETURN(0);
2963 }
2964
2965 int osc_queue_async_io(const struct lu_env *env, struct obd_export *exp,
2966                        struct lov_stripe_md *lsm, struct lov_oinfo *loi,
2967                        struct osc_async_page *oap, int cmd, int off,
2968                        int count, obd_flag brw_flags, enum async_flags async_flags)
2969 {
2970         struct client_obd *cli = &exp->exp_obd->u.cli;
2971         int rc = 0;
2972         ENTRY;
2973
2974         if (oap->oap_magic != OAP_MAGIC)
2975                 RETURN(-EINVAL);
2976
2977         if (cli->cl_import == NULL || cli->cl_import->imp_invalid)
2978                 RETURN(-EIO);
2979
2980         if (!cfs_list_empty(&oap->oap_pending_item) ||
2981             !cfs_list_empty(&oap->oap_urgent_item) ||
2982             !cfs_list_empty(&oap->oap_rpc_item))
2983                 RETURN(-EBUSY);
2984
2985         /* check if the file's owner/group is over quota */
2986         if ((cmd & OBD_BRW_WRITE) && !(cmd & OBD_BRW_NOQUOTA)) {
2987                 struct cl_object *obj;
2988                 struct cl_attr    attr; /* XXX put attr into thread info */
2989                 unsigned int qid[MAXQUOTAS];
2990
2991                 obj = cl_object_top(osc_oap2cl_page(oap)->cp_obj);
2992
2993                 cl_object_attr_lock(obj);
2994                 rc = cl_object_attr_get(env, obj, &attr);
2995                 cl_object_attr_unlock(obj);
2996
2997                 qid[USRQUOTA] = attr.cat_uid;
2998                 qid[GRPQUOTA] = attr.cat_gid;
2999                 if (rc == 0 &&
3000                     lquota_chkdq(quota_interface, cli, qid) == NO_QUOTA)
3001                         rc = -EDQUOT;
3002                 if (rc)
3003                         RETURN(rc);
3004         }
3005
3006         if (loi == NULL)
3007                 loi = lsm->lsm_oinfo[0];
3008
3009         client_obd_list_lock(&cli->cl_loi_list_lock);
3010
3011         LASSERT(off + count <= CFS_PAGE_SIZE);
3012         oap->oap_cmd = cmd;
3013         oap->oap_page_off = off;
3014         oap->oap_count = count;
3015         oap->oap_brw_flags = brw_flags;
3016         /* Give a hint to OST that requests are coming from kswapd - bug19529 */
3017         if (cfs_memory_pressure_get())
3018                 oap->oap_brw_flags |= OBD_BRW_MEMALLOC;
3019         cfs_spin_lock(&oap->oap_lock);
3020         oap->oap_async_flags = async_flags;
3021         cfs_spin_unlock(&oap->oap_lock);
3022
3023         if (cmd & OBD_BRW_WRITE) {
3024                 rc = osc_enter_cache(env, cli, loi, oap);
3025                 if (rc) {
3026                         client_obd_list_unlock(&cli->cl_loi_list_lock);
3027                         RETURN(rc);
3028                 }
3029         }
3030
3031         osc_oap_to_pending(oap);
3032         loi_list_maint(cli, loi);
3033
3034         LOI_DEBUG(loi, "oap %p page %p added for cmd %d\n", oap, oap->oap_page,
3035                   cmd);
3036
3037         osc_check_rpcs(env, cli);
3038         client_obd_list_unlock(&cli->cl_loi_list_lock);
3039
3040         RETURN(0);
3041 }
3042
3043 /* aka (~was & now & flag), but this is more clear :) */
3044 #define SETTING(was, now, flag) (!(was & flag) && (now & flag))
3045
3046 int osc_set_async_flags_base(struct client_obd *cli,
3047                              struct lov_oinfo *loi, struct osc_async_page *oap,
3048                              obd_flag async_flags)
3049 {
3050         struct loi_oap_pages *lop;
3051         int flags = 0;
3052         ENTRY;
3053
3054         LASSERT(!cfs_list_empty(&oap->oap_pending_item));
3055
3056         if (oap->oap_cmd & OBD_BRW_WRITE) {
3057                 lop = &loi->loi_write_lop;
3058         } else {
3059                 lop = &loi->loi_read_lop;
3060         }
3061
3062         if ((oap->oap_async_flags & async_flags) == async_flags)
3063                 RETURN(0);
3064
3065         if (SETTING(oap->oap_async_flags, async_flags, ASYNC_READY))
3066                 flags |= ASYNC_READY;
3067
3068         if (SETTING(oap->oap_async_flags, async_flags, ASYNC_URGENT) &&
3069             cfs_list_empty(&oap->oap_rpc_item)) {
3070                 if (oap->oap_async_flags & ASYNC_HP)
3071                         cfs_list_add(&oap->oap_urgent_item, &lop->lop_urgent);
3072                 else
3073                         cfs_list_add_tail(&oap->oap_urgent_item,
3074                                           &lop->lop_urgent);
3075                 flags |= ASYNC_URGENT;
3076                 loi_list_maint(cli, loi);
3077         }
3078         cfs_spin_lock(&oap->oap_lock);
3079         oap->oap_async_flags |= flags;
3080         cfs_spin_unlock(&oap->oap_lock);
3081
3082         LOI_DEBUG(loi, "oap %p page %p has flags %x\n", oap, oap->oap_page,
3083                         oap->oap_async_flags);
3084         RETURN(0);
3085 }
3086
3087 int osc_teardown_async_page(struct obd_export *exp, struct lov_stripe_md *lsm,
3088                             struct lov_oinfo *loi, struct osc_async_page *oap)
3089 {
3090         struct client_obd *cli = &exp->exp_obd->u.cli;
3091         struct loi_oap_pages *lop;
3092         int rc = 0;
3093         ENTRY;
3094
3095         if (oap->oap_magic != OAP_MAGIC)
3096                 RETURN(-EINVAL);
3097
3098         if (loi == NULL)
3099                 loi = lsm->lsm_oinfo[0];
3100
3101         if (oap->oap_cmd & OBD_BRW_WRITE) {
3102                 lop = &loi->loi_write_lop;
3103         } else {
3104                 lop = &loi->loi_read_lop;
3105         }
3106
3107         client_obd_list_lock(&cli->cl_loi_list_lock);
3108
3109         if (!cfs_list_empty(&oap->oap_rpc_item))
3110                 GOTO(out, rc = -EBUSY);
3111
3112         osc_exit_cache(cli, oap, 0);
3113         osc_wake_cache_waiters(cli);
3114
3115         if (!cfs_list_empty(&oap->oap_urgent_item)) {
3116                 cfs_list_del_init(&oap->oap_urgent_item);
3117                 cfs_spin_lock(&oap->oap_lock);
3118                 oap->oap_async_flags &= ~(ASYNC_URGENT | ASYNC_HP);
3119                 cfs_spin_unlock(&oap->oap_lock);
3120         }
3121         if (!cfs_list_empty(&oap->oap_pending_item)) {
3122                 cfs_list_del_init(&oap->oap_pending_item);
3123                 lop_update_pending(cli, lop, oap->oap_cmd, -1);
3124         }
3125         loi_list_maint(cli, loi);
3126         LOI_DEBUG(loi, "oap %p page %p torn down\n", oap, oap->oap_page);
3127 out:
3128         client_obd_list_unlock(&cli->cl_loi_list_lock);
3129         RETURN(rc);
3130 }
3131
3132 static int osc_set_lock_data_with_check(struct ldlm_lock *lock,
3133                                         struct ldlm_enqueue_info *einfo)
3134 {
3135         void *data = einfo->ei_cbdata;
3136         int set = 0;
3137
3138         LASSERT(lock != NULL);
3139         LASSERT(lock->l_blocking_ast == einfo->ei_cb_bl);
3140         LASSERT(lock->l_resource->lr_type == einfo->ei_type);
3141         LASSERT(lock->l_completion_ast == einfo->ei_cb_cp);
3142         LASSERT(lock->l_glimpse_ast == einfo->ei_cb_gl);
3143
3144         lock_res_and_lock(lock);
3145         cfs_spin_lock(&osc_ast_guard);
3146
3147         if (lock->l_ast_data == NULL)
3148                 lock->l_ast_data = data;
3149         if (lock->l_ast_data == data)
3150                 set = 1;
3151
3152         cfs_spin_unlock(&osc_ast_guard);
3153         unlock_res_and_lock(lock);
3154
3155         return set;
3156 }
3157
3158 static int osc_set_data_with_check(struct lustre_handle *lockh,
3159                                    struct ldlm_enqueue_info *einfo)
3160 {
3161         struct ldlm_lock *lock = ldlm_handle2lock(lockh);
3162         int set = 0;
3163
3164         if (lock != NULL) {
3165                 set = osc_set_lock_data_with_check(lock, einfo);
3166                 LDLM_LOCK_PUT(lock);
3167         } else
3168                 CERROR("lockh %p, data %p - client evicted?\n",
3169                        lockh, einfo->ei_cbdata);
3170         return set;
3171 }
3172
3173 static int osc_change_cbdata(struct obd_export *exp, struct lov_stripe_md *lsm,
3174                              ldlm_iterator_t replace, void *data)
3175 {
3176         struct ldlm_res_id res_id;
3177         struct obd_device *obd = class_exp2obd(exp);
3178
3179         osc_build_res_name(lsm->lsm_object_id, lsm->lsm_object_seq, &res_id);
3180         ldlm_resource_iterate(obd->obd_namespace, &res_id, replace, data);
3181         return 0;
3182 }
3183
3184 /* find any ldlm lock of the inode in osc
3185  * return 0    not find
3186  *        1    find one
3187  *      < 0    error */
3188 static int osc_find_cbdata(struct obd_export *exp, struct lov_stripe_md *lsm,
3189                            ldlm_iterator_t replace, void *data)
3190 {
3191         struct ldlm_res_id res_id;
3192         struct obd_device *obd = class_exp2obd(exp);
3193         int rc = 0;
3194
3195         osc_build_res_name(lsm->lsm_object_id, lsm->lsm_object_seq, &res_id);
3196         rc = ldlm_resource_iterate(obd->obd_namespace, &res_id, replace, data);
3197         if (rc == LDLM_ITER_STOP)
3198                 return(1);
3199         if (rc == LDLM_ITER_CONTINUE)
3200                 return(0);
3201         return(rc);
3202 }
3203
3204 static int osc_enqueue_fini(struct ptlrpc_request *req, struct ost_lvb *lvb,
3205                             obd_enqueue_update_f upcall, void *cookie,
3206                             int *flags, int rc)
3207 {
3208         int intent = *flags & LDLM_FL_HAS_INTENT;
3209         ENTRY;
3210
3211         if (intent) {
3212                 /* The request was created before ldlm_cli_enqueue call. */
3213                 if (rc == ELDLM_LOCK_ABORTED) {
3214                         struct ldlm_reply *rep;
3215                         rep = req_capsule_server_get(&req->rq_pill,
3216                                                      &RMF_DLM_REP);
3217
3218                         LASSERT(rep != NULL);
3219                         if (rep->lock_policy_res1)
3220                                 rc = rep->lock_policy_res1;
3221                 }
3222         }
3223
3224         if ((intent && rc == ELDLM_LOCK_ABORTED) || !rc) {
3225                 *flags |= LDLM_FL_LVB_READY;
3226                 CDEBUG(D_INODE,"got kms "LPU64" blocks "LPU64" mtime "LPU64"\n",
3227                        lvb->lvb_size, lvb->lvb_blocks, lvb->lvb_mtime);
3228         }
3229
3230         /* Call the update callback. */
3231         rc = (*upcall)(cookie, rc);
3232         RETURN(rc);
3233 }
3234
3235 static int osc_enqueue_interpret(const struct lu_env *env,
3236                                  struct ptlrpc_request *req,
3237                                  struct osc_enqueue_args *aa, int rc)
3238 {
3239         struct ldlm_lock *lock;
3240         struct lustre_handle handle;
3241         __u32 mode;
3242
3243         /* Make a local copy of a lock handle and a mode, because aa->oa_*
3244          * might be freed anytime after lock upcall has been called. */
3245         lustre_handle_copy(&handle, aa->oa_lockh);
3246         mode = aa->oa_ei->ei_mode;
3247
3248         /* ldlm_cli_enqueue is holding a reference on the lock, so it must
3249          * be valid. */
3250         lock = ldlm_handle2lock(&handle);
3251
3252         /* Take an additional reference so that a blocking AST that
3253          * ldlm_cli_enqueue_fini() might post for a failed lock, is guaranteed
3254          * to arrive after an upcall has been executed by
3255          * osc_enqueue_fini(). */
3256         ldlm_lock_addref(&handle, mode);
3257
3258         /* Let CP AST to grant the lock first. */
3259         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_ENQ_RACE, 1);
3260
3261         /* Complete obtaining the lock procedure. */
3262         rc = ldlm_cli_enqueue_fini(aa->oa_exp, req, aa->oa_ei->ei_type, 1,
3263                                    mode, aa->oa_flags, aa->oa_lvb,
3264                                    sizeof(*aa->oa_lvb), &handle, rc);
3265         /* Complete osc stuff. */
3266         rc = osc_enqueue_fini(req, aa->oa_lvb,
3267                               aa->oa_upcall, aa->oa_cookie, aa->oa_flags, rc);
3268
3269         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_CANCEL_RACE, 10);
3270
3271         /* Release the lock for async request. */
3272         if (lustre_handle_is_used(&handle) && rc == ELDLM_OK)
3273                 /*
3274                  * Releases a reference taken by ldlm_cli_enqueue(), if it is
3275                  * not already released by
3276                  * ldlm_cli_enqueue_fini()->failed_lock_cleanup()
3277                  */
3278                 ldlm_lock_decref(&handle, mode);
3279
3280         LASSERTF(lock != NULL, "lockh %p, req %p, aa %p - client evicted?\n",
3281                  aa->oa_lockh, req, aa);
3282         ldlm_lock_decref(&handle, mode);
3283         LDLM_LOCK_PUT(lock);
3284         return rc;
3285 }
3286
3287 void osc_update_enqueue(struct lustre_handle *lov_lockhp,
3288                         struct lov_oinfo *loi, int flags,
3289                         struct ost_lvb *lvb, __u32 mode, int rc)
3290 {
3291         if (rc == ELDLM_OK) {
3292                 struct ldlm_lock *lock = ldlm_handle2lock(lov_lockhp);
3293                 __u64 tmp;
3294
3295                 LASSERT(lock != NULL);
3296                 loi->loi_lvb = *lvb;
3297                 tmp = loi->loi_lvb.lvb_size;
3298                 /* Extend KMS up to the end of this lock and no further
3299                  * A lock on [x,y] means a KMS of up to y + 1 bytes! */
3300                 if (tmp > lock->l_policy_data.l_extent.end)
3301                         tmp = lock->l_policy_data.l_extent.end + 1;
3302                 if (tmp >= loi->loi_kms) {
3303                         LDLM_DEBUG(lock, "lock acquired, setting rss="LPU64
3304                                    ", kms="LPU64, loi->loi_lvb.lvb_size, tmp);
3305                         loi_kms_set(loi, tmp);
3306                 } else {
3307                         LDLM_DEBUG(lock, "lock acquired, setting rss="
3308                                    LPU64"; leaving kms="LPU64", end="LPU64,
3309                                    loi->loi_lvb.lvb_size, loi->loi_kms,
3310                                    lock->l_policy_data.l_extent.end);
3311                 }
3312                 ldlm_lock_allow_match(lock);
3313                 LDLM_LOCK_PUT(lock);
3314         } else if (rc == ELDLM_LOCK_ABORTED && (flags & LDLM_FL_HAS_INTENT)) {
3315                 loi->loi_lvb = *lvb;
3316                 CDEBUG(D_INODE, "glimpsed, setting rss="LPU64"; leaving"
3317                        " kms="LPU64"\n", loi->loi_lvb.lvb_size, loi->loi_kms);
3318                 rc = ELDLM_OK;
3319         }
3320 }
3321 EXPORT_SYMBOL(osc_update_enqueue);
3322
3323 struct ptlrpc_request_set *PTLRPCD_SET = (void *)1;
3324
3325 /* When enqueuing asynchronously, locks are not ordered, we can obtain a lock
3326  * from the 2nd OSC before a lock from the 1st one. This does not deadlock with
3327  * other synchronous requests, however keeping some locks and trying to obtain
3328  * others may take a considerable amount of time in a case of ost failure; and
3329  * when other sync requests do not get released lock from a client, the client
3330  * is excluded from the cluster -- such scenarious make the life difficult, so
3331  * release locks just after they are obtained. */
3332 int osc_enqueue_base(struct obd_export *exp, struct ldlm_res_id *res_id,
3333                      int *flags, ldlm_policy_data_t *policy,
3334                      struct ost_lvb *lvb, int kms_valid,
3335                      obd_enqueue_update_f upcall, void *cookie,
3336                      struct ldlm_enqueue_info *einfo,
3337                      struct lustre_handle *lockh,
3338                      struct ptlrpc_request_set *rqset, int async)
3339 {
3340         struct obd_device *obd = exp->exp_obd;
3341         struct ptlrpc_request *req = NULL;
3342         int intent = *flags & LDLM_FL_HAS_INTENT;
3343         ldlm_mode_t mode;
3344         int rc;
3345         ENTRY;
3346
3347         /* Filesystem lock extents are extended to page boundaries so that
3348          * dealing with the page cache is a little smoother.  */
3349         policy->l_extent.start -= policy->l_extent.start & ~CFS_PAGE_MASK;
3350         policy->l_extent.end |= ~CFS_PAGE_MASK;
3351
3352         /*
3353          * kms is not valid when either object is completely fresh (so that no
3354          * locks are cached), or object was evicted. In the latter case cached
3355          * lock cannot be used, because it would prime inode state with
3356          * potentially stale LVB.
3357          */
3358         if (!kms_valid)
3359                 goto no_match;
3360
3361         /* Next, search for already existing extent locks that will cover us */
3362         /* If we're trying to read, we also search for an existing PW lock.  The
3363          * VFS and page cache already protect us locally, so lots of readers/
3364          * writers can share a single PW lock.
3365          *
3366          * There are problems with conversion deadlocks, so instead of
3367          * converting a read lock to a write lock, we'll just enqueue a new
3368          * one.
3369          *
3370          * At some point we should cancel the read lock instead of making them
3371          * send us a blocking callback, but there are problems with canceling
3372          * locks out from other users right now, too. */
3373         mode = einfo->ei_mode;
3374         if (einfo->ei_mode == LCK_PR)
3375                 mode |= LCK_PW;
3376         mode = ldlm_lock_match(obd->obd_namespace,
3377                                *flags | LDLM_FL_LVB_READY, res_id,
3378                                einfo->ei_type, policy, mode, lockh, 0);
3379         if (mode) {
3380                 struct ldlm_lock *matched = ldlm_handle2lock(lockh);
3381
3382                 if (osc_set_lock_data_with_check(matched, einfo)) {
3383                         /* addref the lock only if not async requests and PW
3384                          * lock is matched whereas we asked for PR. */
3385                         if (!rqset && einfo->ei_mode != mode)
3386                                 ldlm_lock_addref(lockh, LCK_PR);
3387                         if (intent) {
3388                                 /* I would like to be able to ASSERT here that
3389                                  * rss <= kms, but I can't, for reasons which
3390                                  * are explained in lov_enqueue() */
3391                         }
3392
3393                         /* We already have a lock, and it's referenced */
3394                         (*upcall)(cookie, ELDLM_OK);
3395
3396                         /* For async requests, decref the lock. */
3397                         if (einfo->ei_mode != mode)
3398                                 ldlm_lock_decref(lockh, LCK_PW);
3399                         else if (rqset)
3400                                 ldlm_lock_decref(lockh, einfo->ei_mode);
3401                         LDLM_LOCK_PUT(matched);
3402                         RETURN(ELDLM_OK);
3403                 } else
3404                         ldlm_lock_decref(lockh, mode);
3405                 LDLM_LOCK_PUT(matched);
3406         }
3407
3408  no_match:
3409         if (intent) {
3410                 CFS_LIST_HEAD(cancels);
3411                 req = ptlrpc_request_alloc(class_exp2cliimp(exp),
3412                                            &RQF_LDLM_ENQUEUE_LVB);
3413                 if (req == NULL)
3414                         RETURN(-ENOMEM);
3415
3416                 rc = ldlm_prep_enqueue_req(exp, req, &cancels, 0);
3417                 if (rc) {
3418                         ptlrpc_request_free(req);
3419                         RETURN(rc);
3420                 }
3421
3422                 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
3423                                      sizeof *lvb);
3424                 ptlrpc_request_set_replen(req);
3425         }
3426
3427         /* users of osc_enqueue() can pass this flag for ldlm_lock_match() */
3428         *flags &= ~LDLM_FL_BLOCK_GRANTED;
3429
3430         rc = ldlm_cli_enqueue(exp, &req, einfo, res_id, policy, flags, lvb,
3431                               sizeof(*lvb), lockh, async);
3432         if (rqset) {
3433                 if (!rc) {
3434                         struct osc_enqueue_args *aa;
3435                         CLASSERT (sizeof(*aa) <= sizeof(req->rq_async_args));
3436                         aa = ptlrpc_req_async_args(req);
3437                         aa->oa_ei = einfo;
3438                         aa->oa_exp = exp;
3439                         aa->oa_flags  = flags;
3440                         aa->oa_upcall = upcall;
3441                         aa->oa_cookie = cookie;
3442                         aa->oa_lvb    = lvb;
3443                         aa->oa_lockh  = lockh;
3444
3445                         req->rq_interpret_reply =
3446                                 (ptlrpc_interpterer_t)osc_enqueue_interpret;
3447                         if (rqset == PTLRPCD_SET)
3448                                 ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
3449                         else
3450                                 ptlrpc_set_add_req(rqset, req);
3451                 } else if (intent) {
3452                         ptlrpc_req_finished(req);
3453                 }
3454                 RETURN(rc);
3455         }
3456
3457         rc = osc_enqueue_fini(req, lvb, upcall, cookie, flags, rc);
3458         if (intent)
3459                 ptlrpc_req_finished(req);
3460
3461         RETURN(rc);
3462 }
3463
3464 static int osc_enqueue(struct obd_export *exp, struct obd_info *oinfo,
3465                        struct ldlm_enqueue_info *einfo,
3466                        struct ptlrpc_request_set *rqset)
3467 {
3468         struct ldlm_res_id res_id;
3469         int rc;
3470         ENTRY;
3471
3472         osc_build_res_name(oinfo->oi_md->lsm_object_id,
3473                            oinfo->oi_md->lsm_object_seq, &res_id);
3474
3475         rc = osc_enqueue_base(exp, &res_id, &oinfo->oi_flags, &oinfo->oi_policy,
3476                               &oinfo->oi_md->lsm_oinfo[0]->loi_lvb,
3477                               oinfo->oi_md->lsm_oinfo[0]->loi_kms_valid,
3478                               oinfo->oi_cb_up, oinfo, einfo, oinfo->oi_lockh,
3479                               rqset, rqset != NULL);
3480         RETURN(rc);
3481 }
3482
3483 int osc_match_base(struct obd_export *exp, struct ldlm_res_id *res_id,
3484                    __u32 type, ldlm_policy_data_t *policy, __u32 mode,
3485                    int *flags, void *data, struct lustre_handle *lockh,
3486                    int unref)
3487 {
3488         struct obd_device *obd = exp->exp_obd;
3489         int lflags = *flags;
3490         ldlm_mode_t rc;
3491         ENTRY;
3492
3493         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_MATCH))
3494                 RETURN(-EIO);
3495
3496         /* Filesystem lock extents are extended to page boundaries so that
3497          * dealing with the page cache is a little smoother */
3498         policy->l_extent.start -= policy->l_extent.start & ~CFS_PAGE_MASK;
3499         policy->l_extent.end |= ~CFS_PAGE_MASK;
3500
3501         /* Next, search for already existing extent locks that will cover us */
3502         /* If we're trying to read, we also search for an existing PW lock.  The
3503          * VFS and page cache already protect us locally, so lots of readers/
3504          * writers can share a single PW lock. */
3505         rc = mode;
3506         if (mode == LCK_PR)
3507                 rc |= LCK_PW;
3508         rc = ldlm_lock_match(obd->obd_namespace, lflags,
3509                              res_id, type, policy, rc, lockh, unref);
3510         if (rc) {
3511                 if (data != NULL) {
3512                         if (!osc_set_data_with_check(lockh, data)) {
3513                                 if (!(lflags & LDLM_FL_TEST_LOCK))
3514                                         ldlm_lock_decref(lockh, rc);
3515                                 RETURN(0);
3516                         }
3517                 }
3518                 if (!(lflags & LDLM_FL_TEST_LOCK) && mode != rc) {
3519                         ldlm_lock_addref(lockh, LCK_PR);
3520                         ldlm_lock_decref(lockh, LCK_PW);
3521                 }
3522                 RETURN(rc);
3523         }
3524         RETURN(rc);
3525 }
3526
3527 int osc_cancel_base(struct lustre_handle *lockh, __u32 mode)
3528 {
3529         ENTRY;
3530
3531         if (unlikely(mode == LCK_GROUP))
3532                 ldlm_lock_decref_and_cancel(lockh, mode);
3533         else
3534                 ldlm_lock_decref(lockh, mode);
3535
3536         RETURN(0);
3537 }
3538
3539 static int osc_cancel(struct obd_export *exp, struct lov_stripe_md *md,
3540                       __u32 mode, struct lustre_handle *lockh)
3541 {
3542         ENTRY;
3543         RETURN(osc_cancel_base(lockh, mode));
3544 }
3545
3546 static int osc_cancel_unused(struct obd_export *exp,
3547                              struct lov_stripe_md *lsm,
3548                              ldlm_cancel_flags_t flags,
3549                              void *opaque)
3550 {
3551         struct obd_device *obd = class_exp2obd(exp);
3552         struct ldlm_res_id res_id, *resp = NULL;
3553
3554         if (lsm != NULL) {
3555                 resp = osc_build_res_name(lsm->lsm_object_id,
3556                                           lsm->lsm_object_seq, &res_id);
3557         }
3558
3559         return ldlm_cli_cancel_unused(obd->obd_namespace, resp, flags, opaque);
3560 }
3561
3562 static int osc_statfs_interpret(const struct lu_env *env,
3563                                 struct ptlrpc_request *req,
3564                                 struct osc_async_args *aa, int rc)
3565 {
3566         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
3567         struct obd_statfs *msfs;
3568         __u64 used;
3569         ENTRY;
3570
3571         if (rc == -EBADR)
3572                 /* The request has in fact never been sent
3573                  * due to issues at a higher level (LOV).
3574                  * Exit immediately since the caller is
3575                  * aware of the problem and takes care
3576                  * of the clean up */
3577                  RETURN(rc);
3578
3579         if ((rc == -ENOTCONN || rc == -EAGAIN) &&
3580             (aa->aa_oi->oi_flags & OBD_STATFS_NODELAY))
3581                 GOTO(out, rc = 0);
3582
3583         if (rc != 0)
3584                 GOTO(out, rc);
3585
3586         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
3587         if (msfs == NULL) {
3588                 GOTO(out, rc = -EPROTO);
3589         }
3590
3591         /* Reinitialize the RDONLY and DEGRADED flags at the client
3592          * on each statfs, so they don't stay set permanently. */
3593         cfs_spin_lock(&cli->cl_oscc.oscc_lock);
3594
3595         if (unlikely(msfs->os_state & OS_STATE_DEGRADED))
3596                 cli->cl_oscc.oscc_flags |= OSCC_FLAG_DEGRADED;
3597         else if (unlikely(cli->cl_oscc.oscc_flags & OSCC_FLAG_DEGRADED))
3598                 cli->cl_oscc.oscc_flags &= ~OSCC_FLAG_DEGRADED;
3599
3600         if (unlikely(msfs->os_state & OS_STATE_READONLY))
3601                 cli->cl_oscc.oscc_flags |= OSCC_FLAG_RDONLY;
3602         else if (unlikely(cli->cl_oscc.oscc_flags & OSCC_FLAG_RDONLY))
3603                 cli->cl_oscc.oscc_flags &= ~OSCC_FLAG_RDONLY;
3604
3605         /* Add a bit of hysteresis so this flag isn't continually flapping,
3606          * and ensure that new files don't get extremely fragmented due to
3607          * only a small amount of available space in the filesystem.
3608          * We want to set the NOSPC flag when there is less than ~0.1% free
3609          * and clear it when there is at least ~0.2% free space, so:
3610          *                   avail < ~0.1% max          max = avail + used
3611          *            1025 * avail < avail + used       used = blocks - free
3612          *            1024 * avail < used
3613          *            1024 * avail < blocks - free
3614          *                   avail < ((blocks - free) >> 10)
3615          *
3616          * On very large disk, say 16TB 0.1% will be 16 GB. We don't want to
3617          * lose that amount of space so in those cases we report no space left
3618          * if their is less than 1 GB left.                             */
3619         used = min_t(__u64,(msfs->os_blocks - msfs->os_bfree) >> 10, 1 << 30);
3620         if (unlikely(((cli->cl_oscc.oscc_flags & OSCC_FLAG_NOSPC) == 0) &&
3621                      ((msfs->os_ffree < 32) || (msfs->os_bavail < used))))
3622                 cli->cl_oscc.oscc_flags |= OSCC_FLAG_NOSPC;
3623         else if (unlikely(((cli->cl_oscc.oscc_flags & OSCC_FLAG_NOSPC) != 0) &&
3624                           (msfs->os_ffree > 64) &&
3625                           (msfs->os_bavail > (used << 1)))) {
3626                 cli->cl_oscc.oscc_flags &= ~(OSCC_FLAG_NOSPC |
3627                                              OSCC_FLAG_NOSPC_BLK);
3628         }
3629
3630         if (unlikely(((cli->cl_oscc.oscc_flags & OSCC_FLAG_NOSPC) != 0) &&
3631                      (msfs->os_bavail < used)))
3632                 cli->cl_oscc.oscc_flags |= OSCC_FLAG_NOSPC_BLK;
3633
3634         cfs_spin_unlock(&cli->cl_oscc.oscc_lock);
3635
3636         *aa->aa_oi->oi_osfs = *msfs;
3637 out:
3638         rc = aa->aa_oi->oi_cb_up(aa->aa_oi, rc);
3639         RETURN(rc);
3640 }
3641
3642 static int osc_statfs_async(struct obd_device *obd, struct obd_info *oinfo,
3643                             __u64 max_age, struct ptlrpc_request_set *rqset)
3644 {
3645         struct ptlrpc_request *req;
3646         struct osc_async_args *aa;
3647         int                    rc;
3648         ENTRY;
3649
3650         /* We could possibly pass max_age in the request (as an absolute
3651          * timestamp or a "seconds.usec ago") so the target can avoid doing
3652          * extra calls into the filesystem if that isn't necessary (e.g.
3653          * during mount that would help a bit).  Having relative timestamps
3654          * is not so great if request processing is slow, while absolute
3655          * timestamps are not ideal because they need time synchronization. */
3656         req = ptlrpc_request_alloc(obd->u.cli.cl_import, &RQF_OST_STATFS);
3657         if (req == NULL)
3658                 RETURN(-ENOMEM);
3659
3660         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_STATFS);
3661         if (rc) {
3662                 ptlrpc_request_free(req);
3663                 RETURN(rc);
3664         }
3665         ptlrpc_request_set_replen(req);
3666         req->rq_request_portal = OST_CREATE_PORTAL;
3667         ptlrpc_at_set_req_timeout(req);
3668
3669         if (oinfo->oi_flags & OBD_STATFS_NODELAY) {
3670                 /* procfs requests not want stat in wait for avoid deadlock */
3671                 req->rq_no_resend = 1;
3672                 req->rq_no_delay = 1;
3673         }
3674
3675         req->rq_interpret_reply = (ptlrpc_interpterer_t)osc_statfs_interpret;
3676         CLASSERT (sizeof(*aa) <= sizeof(req->rq_async_args));
3677         aa = ptlrpc_req_async_args(req);
3678         aa->aa_oi = oinfo;
3679
3680         ptlrpc_set_add_req(rqset, req);
3681         RETURN(0);
3682 }
3683
3684 static int osc_statfs(struct obd_device *obd, struct obd_statfs *osfs,
3685                       __u64 max_age, __u32 flags)
3686 {
3687         struct obd_statfs     *msfs;
3688         struct ptlrpc_request *req;
3689         struct obd_import     *imp = NULL;
3690         int rc;
3691         ENTRY;
3692
3693         /*Since the request might also come from lprocfs, so we need
3694          *sync this with client_disconnect_export Bug15684*/
3695         cfs_down_read(&obd->u.cli.cl_sem);
3696         if (obd->u.cli.cl_import)
3697                 imp = class_import_get(obd->u.cli.cl_import);
3698         cfs_up_read(&obd->u.cli.cl_sem);
3699         if (!imp)
3700                 RETURN(-ENODEV);
3701
3702         /* We could possibly pass max_age in the request (as an absolute
3703          * timestamp or a "seconds.usec ago") so the target can avoid doing
3704          * extra calls into the filesystem if that isn't necessary (e.g.
3705          * during mount that would help a bit).  Having relative timestamps
3706          * is not so great if request processing is slow, while absolute
3707          * timestamps are not ideal because they need time synchronization. */
3708         req = ptlrpc_request_alloc(imp, &RQF_OST_STATFS);
3709
3710         class_import_put(imp);
3711
3712         if (req == NULL)
3713                 RETURN(-ENOMEM);
3714
3715         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_STATFS);
3716         if (rc) {
3717                 ptlrpc_request_free(req);
3718                 RETURN(rc);
3719         }
3720         ptlrpc_request_set_replen(req);
3721         req->rq_request_portal = OST_CREATE_PORTAL;
3722         ptlrpc_at_set_req_timeout(req);
3723
3724         if (flags & OBD_STATFS_NODELAY) {
3725                 /* procfs requests not want stat in wait for avoid deadlock */
3726                 req->rq_no_resend = 1;
3727                 req->rq_no_delay = 1;
3728         }
3729
3730         rc = ptlrpc_queue_wait(req);
3731         if (rc)
3732                 GOTO(out, rc);
3733
3734         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
3735         if (msfs == NULL) {
3736                 GOTO(out, rc = -EPROTO);
3737         }
3738
3739         *osfs = *msfs;
3740
3741         EXIT;
3742  out:
3743         ptlrpc_req_finished(req);
3744         return rc;
3745 }
3746
3747 /* Retrieve object striping information.
3748  *
3749  * @lmmu is a pointer to an in-core struct with lmm_ost_count indicating
3750  * the maximum number of OST indices which will fit in the user buffer.
3751  * lmm_magic must be LOV_MAGIC (we only use 1 slot here).
3752  */
3753 static int osc_getstripe(struct lov_stripe_md *lsm, struct lov_user_md *lump)
3754 {
3755         /* we use lov_user_md_v3 because it is larger than lov_user_md_v1 */
3756         struct lov_user_md_v3 lum, *lumk;
3757         struct lov_user_ost_data_v1 *lmm_objects;
3758         int rc = 0, lum_size;
3759         ENTRY;
3760
3761         if (!lsm)
3762                 RETURN(-ENODATA);
3763
3764         /* we only need the header part from user space to get lmm_magic and
3765          * lmm_stripe_count, (the header part is common to v1 and v3) */
3766         lum_size = sizeof(struct lov_user_md_v1);
3767         if (cfs_copy_from_user(&lum, lump, lum_size))
3768                 RETURN(-EFAULT);
3769
3770         if ((lum.lmm_magic != LOV_USER_MAGIC_V1) &&
3771             (lum.lmm_magic != LOV_USER_MAGIC_V3))
3772                 RETURN(-EINVAL);
3773
3774         /* lov_user_md_vX and lov_mds_md_vX must have the same size */
3775         LASSERT(sizeof(struct lov_user_md_v1) == sizeof(struct lov_mds_md_v1));
3776         LASSERT(sizeof(struct lov_user_md_v3) == sizeof(struct lov_mds_md_v3));
3777         LASSERT(sizeof(lum.lmm_objects[0]) == sizeof(lumk->lmm_objects[0]));
3778
3779         /* we can use lov_mds_md_size() to compute lum_size
3780          * because lov_user_md_vX and lov_mds_md_vX have the same size */
3781         if (lum.lmm_stripe_count > 0) {
3782                 lum_size = lov_mds_md_size(lum.lmm_stripe_count, lum.lmm_magic);
3783                 OBD_ALLOC(lumk, lum_size);
3784                 if (!lumk)
3785                         RETURN(-ENOMEM);
3786
3787                 if (lum.lmm_magic == LOV_USER_MAGIC_V1)
3788                         lmm_objects = &(((struct lov_user_md_v1 *)lumk)->lmm_objects[0]);
3789                 else
3790                         lmm_objects = &(lumk->lmm_objects[0]);
3791                 lmm_objects->l_object_id = lsm->lsm_object_id;
3792         } else {
3793                 lum_size = lov_mds_md_size(0, lum.lmm_magic);
3794                 lumk = &lum;
3795         }
3796
3797         lumk->lmm_object_id = lsm->lsm_object_id;
3798         lumk->lmm_object_seq = lsm->lsm_object_seq;
3799         lumk->lmm_stripe_count = 1;
3800
3801         if (cfs_copy_to_user(lump, lumk, lum_size))
3802                 rc = -EFAULT;
3803
3804         if (lumk != &lum)
3805                 OBD_FREE(lumk, lum_size);
3806
3807         RETURN(rc);
3808 }
3809
3810
3811 static int osc_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
3812                          void *karg, void *uarg)
3813 {
3814         struct obd_device *obd = exp->exp_obd;
3815         struct obd_ioctl_data *data = karg;
3816         int err = 0;
3817         ENTRY;
3818
3819         if (!cfs_try_module_get(THIS_MODULE)) {
3820                 CERROR("Can't get module. Is it alive?");
3821                 return -EINVAL;
3822         }
3823         switch (cmd) {
3824         case OBD_IOC_LOV_GET_CONFIG: {
3825                 char *buf;
3826                 struct lov_desc *desc;
3827                 struct obd_uuid uuid;
3828
3829                 buf = NULL;
3830                 len = 0;
3831                 if (obd_ioctl_getdata(&buf, &len, (void *)uarg))
3832                         GOTO(out, err = -EINVAL);
3833
3834                 data = (struct obd_ioctl_data *)buf;
3835
3836                 if (sizeof(*desc) > data->ioc_inllen1) {
3837                         obd_ioctl_freedata(buf, len);
3838                         GOTO(out, err = -EINVAL);
3839                 }
3840
3841                 if (data->ioc_inllen2 < sizeof(uuid)) {
3842                         obd_ioctl_freedata(buf, len);
3843                         GOTO(out, err = -EINVAL);
3844                 }
3845
3846                 desc = (struct lov_desc *)data->ioc_inlbuf1;
3847                 desc->ld_tgt_count = 1;
3848                 desc->ld_active_tgt_count = 1;
3849                 desc->ld_default_stripe_count = 1;
3850                 desc->ld_default_stripe_size = 0;
3851                 desc->ld_default_stripe_offset = 0;
3852                 desc->ld_pattern = 0;
3853                 memcpy(&desc->ld_uuid, &obd->obd_uuid, sizeof(uuid));
3854
3855                 memcpy(data->ioc_inlbuf2, &obd->obd_uuid, sizeof(uuid));
3856
3857                 err = cfs_copy_to_user((void *)uarg, buf, len);
3858                 if (err)
3859                         err = -EFAULT;
3860                 obd_ioctl_freedata(buf, len);
3861                 GOTO(out, err);
3862         }
3863         case LL_IOC_LOV_SETSTRIPE:
3864                 err = obd_alloc_memmd(exp, karg);
3865                 if (err > 0)
3866                         err = 0;
3867                 GOTO(out, err);
3868         case LL_IOC_LOV_GETSTRIPE:
3869                 err = osc_getstripe(karg, uarg);
3870                 GOTO(out, err);
3871         case OBD_IOC_CLIENT_RECOVER:
3872                 err = ptlrpc_recover_import(obd->u.cli.cl_import,
3873                                             data->ioc_inlbuf1, 0);
3874                 if (err > 0)
3875                         err = 0;
3876                 GOTO(out, err);
3877         case IOC_OSC_SET_ACTIVE:
3878                 err = ptlrpc_set_import_active(obd->u.cli.cl_import,
3879                                                data->ioc_offset);
3880                 GOTO(out, err);
3881         case OBD_IOC_POLL_QUOTACHECK:
3882                 err = lquota_poll_check(quota_interface, exp,
3883                                         (struct if_quotacheck *)karg);
3884                 GOTO(out, err);
3885         case OBD_IOC_PING_TARGET:
3886                 err = ptlrpc_obd_ping(obd);
3887                 GOTO(out, err);
3888         default:
3889                 CDEBUG(D_INODE, "unrecognised ioctl %#x by %s\n",
3890                        cmd, cfs_curproc_comm());
3891                 GOTO(out, err = -ENOTTY);
3892         }
3893 out:
3894         cfs_module_put(THIS_MODULE);
3895         return err;
3896 }
3897
3898 static int osc_get_info(struct obd_export *exp, obd_count keylen,
3899                         void *key, __u32 *vallen, void *val,
3900                         struct lov_stripe_md *lsm)
3901 {
3902         ENTRY;
3903         if (!vallen || !val)
3904                 RETURN(-EFAULT);
3905
3906         if (KEY_IS(KEY_LOCK_TO_STRIPE)) {
3907                 __u32 *stripe = val;
3908                 *vallen = sizeof(*stripe);
3909                 *stripe = 0;
3910                 RETURN(0);
3911         } else if (KEY_IS(KEY_LAST_ID)) {
3912                 struct ptlrpc_request *req;
3913                 obd_id                *reply;
3914                 char                  *tmp;
3915                 int                    rc;
3916
3917                 req = ptlrpc_request_alloc(class_exp2cliimp(exp),
3918                                            &RQF_OST_GET_INFO_LAST_ID);
3919                 if (req == NULL)
3920                         RETURN(-ENOMEM);
3921
3922                 req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_KEY,
3923                                      RCL_CLIENT, keylen);
3924                 rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GET_INFO);
3925                 if (rc) {
3926                         ptlrpc_request_free(req);
3927                         RETURN(rc);
3928                 }
3929
3930                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
3931                 memcpy(tmp, key, keylen);
3932
3933                 req->rq_no_delay = req->rq_no_resend = 1;
3934                 ptlrpc_request_set_replen(req);
3935                 rc = ptlrpc_queue_wait(req);
3936                 if (rc)
3937                         GOTO(out, rc);
3938
3939                 reply = req_capsule_server_get(&req->rq_pill, &RMF_OBD_ID);
3940                 if (reply == NULL)
3941                         GOTO(out, rc = -EPROTO);
3942
3943                 *((obd_id *)val) = *reply;
3944         out:
3945                 ptlrpc_req_finished(req);
3946                 RETURN(rc);
3947         } else if (KEY_IS(KEY_FIEMAP)) {
3948                 struct ptlrpc_request *req;
3949                 struct ll_user_fiemap *reply;
3950                 char *tmp;
3951                 int rc;
3952
3953                 req = ptlrpc_request_alloc(class_exp2cliimp(exp),
3954                                            &RQF_OST_GET_INFO_FIEMAP);
3955                 if (req == NULL)
3956                         RETURN(-ENOMEM);
3957
3958                 req_capsule_set_size(&req->rq_pill, &RMF_FIEMAP_KEY,
3959                                      RCL_CLIENT, keylen);
3960                 req_capsule_set_size(&req->rq_pill, &RMF_FIEMAP_VAL,
3961                                      RCL_CLIENT, *vallen);
3962                 req_capsule_set_size(&req->rq_pill, &RMF_FIEMAP_VAL,
3963                                      RCL_SERVER, *vallen);
3964
3965                 rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GET_INFO);
3966                 if (rc) {
3967                         ptlrpc_request_free(req);
3968                         RETURN(rc);
3969                 }
3970
3971                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_FIEMAP_KEY);
3972                 memcpy(tmp, key, keylen);
3973                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_FIEMAP_VAL);
3974                 memcpy(tmp, val, *vallen);
3975
3976                 ptlrpc_request_set_replen(req);
3977                 rc = ptlrpc_queue_wait(req);
3978                 if (rc)
3979                         GOTO(out1, rc);
3980
3981                 reply = req_capsule_server_get(&req->rq_pill, &RMF_FIEMAP_VAL);
3982                 if (reply == NULL)
3983                         GOTO(out1, rc = -EPROTO);
3984
3985                 memcpy(val, reply, *vallen);
3986         out1:
3987                 ptlrpc_req_finished(req);
3988
3989                 RETURN(rc);
3990         }
3991
3992         RETURN(-EINVAL);
3993 }
3994
3995 static int osc_setinfo_mds_connect_import(struct obd_import *imp)
3996 {
3997         struct llog_ctxt *ctxt;
3998         int rc = 0;
3999         ENTRY;
4000
4001         ctxt = llog_get_context(imp->imp_obd, LLOG_MDS_OST_ORIG_CTXT);
4002         if (ctxt) {
4003                 rc = llog_initiator_connect(ctxt);
4004                 llog_ctxt_put(ctxt);
4005         } else {
4006                 /* XXX return an error? skip setting below flags? */
4007         }
4008
4009         cfs_spin_lock(&imp->imp_lock);
4010         imp->imp_server_timeout = 1;
4011         imp->imp_pingable = 1;
4012         cfs_spin_unlock(&imp->imp_lock);
4013         CDEBUG(D_RPCTRACE, "pinging OST %s\n", obd2cli_tgt(imp->imp_obd));
4014
4015         RETURN(rc);
4016 }
4017
4018 static int osc_setinfo_mds_conn_interpret(const struct lu_env *env,
4019                                           struct ptlrpc_request *req,
4020                                           void *aa, int rc)
4021 {
4022         ENTRY;
4023         if (rc != 0)
4024                 RETURN(rc);
4025
4026         RETURN(osc_setinfo_mds_connect_import(req->rq_import));
4027 }
4028
4029 static int osc_set_info_async(struct obd_export *exp, obd_count keylen,
4030                               void *key, obd_count vallen, void *val,
4031                               struct ptlrpc_request_set *set)
4032 {
4033         struct ptlrpc_request *req;
4034         struct obd_device     *obd = exp->exp_obd;
4035         struct obd_import     *imp = class_exp2cliimp(exp);
4036         char                  *tmp;
4037         int                    rc;
4038         ENTRY;
4039
4040         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_SHUTDOWN, 10);
4041
4042         if (KEY_IS(KEY_NEXT_ID)) {
4043                 obd_id new_val;
4044                 struct osc_creator *oscc = &obd->u.cli.cl_oscc;
4045
4046                 if (vallen != sizeof(obd_id))
4047                         RETURN(-ERANGE);
4048                 if (val == NULL)
4049                         RETURN(-EINVAL);
4050
4051                 if (vallen != sizeof(obd_id))
4052                         RETURN(-EINVAL);
4053
4054                 /* avoid race between allocate new object and set next id
4055                  * from ll_sync thread */
4056                 cfs_spin_lock(&oscc->oscc_lock);
4057                 new_val = *((obd_id*)val) + 1;
4058                 if (new_val > oscc->oscc_next_id)
4059                         oscc->oscc_next_id = new_val;
4060                 cfs_spin_unlock(&oscc->oscc_lock);
4061                 CDEBUG(D_HA, "%s: set oscc_next_id = "LPU64"\n",
4062                        exp->exp_obd->obd_name,
4063                        obd->u.cli.cl_oscc.oscc_next_id);
4064
4065                 RETURN(0);
4066         }
4067
4068         if (KEY_IS(KEY_CHECKSUM)) {
4069                 if (vallen != sizeof(int))
4070                         RETURN(-EINVAL);
4071                 exp->exp_obd->u.cli.cl_checksum = (*(int *)val) ? 1 : 0;
4072                 RETURN(0);
4073         }
4074
4075         if (KEY_IS(KEY_SPTLRPC_CONF)) {
4076                 sptlrpc_conf_client_adapt(obd);
4077                 RETURN(0);
4078         }
4079
4080         if (KEY_IS(KEY_FLUSH_CTX)) {
4081                 sptlrpc_import_flush_my_ctx(imp);
4082                 RETURN(0);
4083         }
4084
4085         if (!set && !KEY_IS(KEY_GRANT_SHRINK))
4086                 RETURN(-EINVAL);
4087
4088         /* We pass all other commands directly to OST. Since nobody calls osc
4089            methods directly and everybody is supposed to go through LOV, we
4090            assume lov checked invalid values for us.
4091            The only recognised values so far are evict_by_nid and mds_conn.
4092            Even if something bad goes through, we'd get a -EINVAL from OST
4093            anyway. */
4094
4095         if (KEY_IS(KEY_GRANT_SHRINK))
4096                 req = ptlrpc_request_alloc(imp, &RQF_OST_SET_GRANT_INFO);
4097         else
4098                 req = ptlrpc_request_alloc(imp, &RQF_OBD_SET_INFO);
4099
4100         if (req == NULL)
4101                 RETURN(-ENOMEM);
4102
4103         req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_KEY,
4104                              RCL_CLIENT, keylen);
4105         req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_VAL,
4106                              RCL_CLIENT, vallen);
4107         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SET_INFO);
4108         if (rc) {
4109                 ptlrpc_request_free(req);
4110                 RETURN(rc);
4111         }
4112
4113         tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
4114         memcpy(tmp, key, keylen);
4115         tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_VAL);
4116         memcpy(tmp, val, vallen);
4117
4118         if (KEY_IS(KEY_MDS_CONN)) {
4119                 struct osc_creator *oscc = &obd->u.cli.cl_oscc;
4120
4121                 oscc->oscc_oa.o_seq = (*(__u32 *)val);
4122                 oscc->oscc_oa.o_valid |= OBD_MD_FLGROUP;
4123                 LASSERT_SEQ_IS_MDT(oscc->oscc_oa.o_seq);
4124                 req->rq_no_delay = req->rq_no_resend = 1;
4125                 req->rq_interpret_reply = osc_setinfo_mds_conn_interpret;
4126         } else if (KEY_IS(KEY_GRANT_SHRINK)) {
4127                 struct osc_grant_args *aa;
4128                 struct obdo *oa;
4129
4130                 CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
4131                 aa = ptlrpc_req_async_args(req);
4132                 OBDO_ALLOC(oa);
4133                 if (!oa) {
4134                         ptlrpc_req_finished(req);
4135                         RETURN(-ENOMEM);
4136                 }
4137                 *oa = ((struct ost_body *)val)->oa;
4138                 aa->aa_oa = oa;
4139                 req->rq_interpret_reply = osc_shrink_grant_interpret;
4140         }
4141
4142         ptlrpc_request_set_replen(req);
4143         if (!KEY_IS(KEY_GRANT_SHRINK)) {
4144                 LASSERT(set != NULL);
4145                 ptlrpc_set_add_req(set, req);
4146                 ptlrpc_check_set(NULL, set);
4147         } else
4148                 ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
4149
4150         RETURN(0);
4151 }
4152
4153
4154 static struct llog_operations osc_size_repl_logops = {
4155         lop_cancel: llog_obd_repl_cancel
4156 };
4157
4158 static struct llog_operations osc_mds_ost_orig_logops;
4159
4160 static int __osc_llog_init(struct obd_device *obd, struct obd_llog_group *olg,
4161                            struct obd_device *tgt, struct llog_catid *catid)
4162 {
4163         int rc;
4164         ENTRY;
4165
4166         rc = llog_setup(obd, &obd->obd_olg, LLOG_MDS_OST_ORIG_CTXT, tgt, 1,
4167                         &catid->lci_logid, &osc_mds_ost_orig_logops);
4168         if (rc) {
4169                 CERROR("failed LLOG_MDS_OST_ORIG_CTXT\n");
4170                 GOTO(out, rc);
4171         }
4172
4173         rc = llog_setup(obd, &obd->obd_olg, LLOG_SIZE_REPL_CTXT, tgt, 1,
4174                         NULL, &osc_size_repl_logops);
4175         if (rc) {
4176                 struct llog_ctxt *ctxt =
4177                         llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
4178                 if (ctxt)
4179                         llog_cleanup(ctxt);
4180                 CERROR("failed LLOG_SIZE_REPL_CTXT\n");
4181         }
4182         GOTO(out, rc);
4183 out:
4184         if (rc) {
4185                 CERROR("osc '%s' tgt '%s' catid %p rc=%d\n",
4186                        obd->obd_name, tgt->obd_name, catid, rc);
4187                 CERROR("logid "LPX64":0x%x\n",
4188                        catid->lci_logid.lgl_oid, catid->lci_logid.lgl_ogen);
4189         }
4190         return rc;
4191 }
4192
4193 static int osc_llog_init(struct obd_device *obd, struct obd_llog_group *olg,
4194                          struct obd_device *disk_obd, int *index)
4195 {
4196         struct llog_catid catid;
4197         static char name[32] = CATLIST;
4198         int rc;
4199         ENTRY;
4200
4201         LASSERT(olg == &obd->obd_olg);
4202
4203         cfs_mutex_down(&olg->olg_cat_processing);
4204         rc = llog_get_cat_list(disk_obd, name, *index, 1, &catid);
4205         if (rc) {
4206                 CERROR("rc: %d\n", rc);
4207                 GOTO(out, rc);
4208         }
4209
4210         CDEBUG(D_INFO, "%s: Init llog for %d - catid "LPX64"/"LPX64":%x\n",
4211                obd->obd_name, *index, catid.lci_logid.lgl_oid,
4212                catid.lci_logid.lgl_oseq, catid.lci_logid.lgl_ogen);
4213
4214         rc = __osc_llog_init(obd, olg, disk_obd, &catid);
4215         if (rc) {
4216                 CERROR("rc: %d\n", rc);
4217                 GOTO(out, rc);
4218         }
4219
4220         rc = llog_put_cat_list(disk_obd, name, *index, 1, &catid);
4221         if (rc) {
4222                 CERROR("rc: %d\n", rc);
4223                 GOTO(out, rc);
4224         }
4225
4226  out:
4227         cfs_mutex_up(&olg->olg_cat_processing);
4228
4229         return rc;
4230 }
4231
4232 static int osc_llog_finish(struct obd_device *obd, int count)
4233 {
4234         struct llog_ctxt *ctxt;
4235         int rc = 0, rc2 = 0;
4236         ENTRY;
4237
4238         ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
4239         if (ctxt)
4240                 rc = llog_cleanup(ctxt);
4241
4242         ctxt = llog_get_context(obd, LLOG_SIZE_REPL_CTXT);
4243         if (ctxt)
4244                 rc2 = llog_cleanup(ctxt);
4245         if (!rc)
4246                 rc = rc2;
4247
4248         RETURN(rc);
4249 }
4250
4251 static int osc_reconnect(const struct lu_env *env,
4252                          struct obd_export *exp, struct obd_device *obd,
4253                          struct obd_uuid *cluuid,
4254                          struct obd_connect_data *data,
4255                          void *localdata)
4256 {
4257         struct client_obd *cli = &obd->u.cli;
4258
4259         if (data != NULL && (data->ocd_connect_flags & OBD_CONNECT_GRANT)) {
4260                 long lost_grant;
4261
4262                 client_obd_list_lock(&cli->cl_loi_list_lock);
4263                 data->ocd_grant = (cli->cl_avail_grant + cli->cl_dirty) ?:
4264                                 2 * cli->cl_max_pages_per_rpc << CFS_PAGE_SHIFT;
4265                 lost_grant = cli->cl_lost_grant;
4266                 cli->cl_lost_grant = 0;
4267                 client_obd_list_unlock(&cli->cl_loi_list_lock);
4268
4269                 CDEBUG(D_CACHE, "request ocd_grant: %d cl_avail_grant: %ld "
4270                        "cl_dirty: %ld cl_lost_grant: %ld\n", data->ocd_grant,
4271                        cli->cl_avail_grant, cli->cl_dirty, lost_grant);
4272                 CDEBUG(D_RPCTRACE, "ocd_connect_flags: "LPX64" ocd_version: %d"
4273                        " ocd_grant: %d\n", data->ocd_connect_flags,
4274                        data->ocd_version, data->ocd_grant);
4275         }
4276
4277         RETURN(0);
4278 }
4279
4280 static int osc_disconnect(struct obd_export *exp)
4281 {
4282         struct obd_device *obd = class_exp2obd(exp);
4283         struct llog_ctxt  *ctxt;
4284         int rc;
4285
4286         ctxt = llog_get_context(obd, LLOG_SIZE_REPL_CTXT);
4287         if (ctxt) {
4288                 if (obd->u.cli.cl_conn_count == 1) {
4289                         /* Flush any remaining cancel messages out to the
4290                          * target */
4291                         llog_sync(ctxt, exp);
4292                 }
4293                 llog_ctxt_put(ctxt);
4294         } else {
4295                 CDEBUG(D_HA, "No LLOG_SIZE_REPL_CTXT found in obd %p\n",
4296                        obd);
4297         }
4298
4299         rc = client_disconnect_export(exp);
4300         /**
4301          * Initially we put del_shrink_grant before disconnect_export, but it
4302          * causes the following problem if setup (connect) and cleanup
4303          * (disconnect) are tangled together.
4304          *      connect p1                     disconnect p2
4305          *   ptlrpc_connect_import
4306          *     ...............               class_manual_cleanup
4307          *                                     osc_disconnect
4308          *                                     del_shrink_grant
4309          *   ptlrpc_connect_interrupt
4310          *     init_grant_shrink
4311          *   add this client to shrink list
4312          *                                      cleanup_osc
4313          * Bang! pinger trigger the shrink.
4314          * So the osc should be disconnected from the shrink list, after we
4315          * are sure the import has been destroyed. BUG18662
4316          */
4317         if (obd->u.cli.cl_import == NULL)
4318                 osc_del_shrink_grant(&obd->u.cli);
4319         return rc;
4320 }
4321
4322 static int osc_import_event(struct obd_device *obd,
4323                             struct obd_import *imp,
4324                             enum obd_import_event event)
4325 {
4326         struct client_obd *cli;
4327         int rc = 0;
4328
4329         ENTRY;
4330         LASSERT(imp->imp_obd == obd);
4331
4332         switch (event) {
4333         case IMP_EVENT_DISCON: {
4334                 /* Only do this on the MDS OSC's */
4335                 if (imp->imp_server_timeout) {
4336                         struct osc_creator *oscc = &obd->u.cli.cl_oscc;
4337
4338                         cfs_spin_lock(&oscc->oscc_lock);
4339                         oscc->oscc_flags |= OSCC_FLAG_RECOVERING;
4340                         cfs_spin_unlock(&oscc->oscc_lock);
4341                 }
4342                 cli = &obd->u.cli;
4343                 client_obd_list_lock(&cli->cl_loi_list_lock);
4344                 cli->cl_avail_grant = 0;
4345                 cli->cl_lost_grant = 0;
4346                 client_obd_list_unlock(&cli->cl_loi_list_lock);
4347                 break;
4348         }
4349         case IMP_EVENT_INACTIVE: {
4350                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_INACTIVE, NULL);
4351                 break;
4352         }
4353         case IMP_EVENT_INVALIDATE: {
4354                 struct ldlm_namespace *ns = obd->obd_namespace;
4355                 struct lu_env         *env;
4356                 int                    refcheck;
4357
4358                 env = cl_env_get(&refcheck);
4359                 if (!IS_ERR(env)) {
4360                         /* Reset grants */
4361                         cli = &obd->u.cli;
4362                         client_obd_list_lock(&cli->cl_loi_list_lock);
4363                         /* all pages go to failing rpcs due to the invalid
4364                          * import */
4365                         osc_check_rpcs(env, cli);
4366                         client_obd_list_unlock(&cli->cl_loi_list_lock);
4367
4368                         ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
4369                         cl_env_put(env, &refcheck);
4370                 } else
4371                         rc = PTR_ERR(env);
4372                 break;
4373         }
4374         case IMP_EVENT_ACTIVE: {
4375                 /* Only do this on the MDS OSC's */
4376                 if (imp->imp_server_timeout) {
4377                         struct osc_creator *oscc = &obd->u.cli.cl_oscc;
4378
4379                         cfs_spin_lock(&oscc->oscc_lock);
4380                         oscc->oscc_flags &= ~(OSCC_FLAG_NOSPC |
4381                                               OSCC_FLAG_NOSPC_BLK);
4382                         cfs_spin_unlock(&oscc->oscc_lock);
4383                 }
4384                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_ACTIVE, NULL);
4385                 break;
4386         }
4387         case IMP_EVENT_OCD: {
4388                 struct obd_connect_data *ocd = &imp->imp_connect_data;
4389
4390                 if (ocd->ocd_connect_flags & OBD_CONNECT_GRANT)
4391                         osc_init_grant(&obd->u.cli, ocd);
4392
4393                 /* See bug 7198 */
4394                 if (ocd->ocd_connect_flags & OBD_CONNECT_REQPORTAL)
4395                         imp->imp_client->cli_request_portal =OST_REQUEST_PORTAL;
4396
4397                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_OCD, NULL);
4398                 break;
4399         }
4400         case IMP_EVENT_DEACTIVATE: {
4401                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_DEACTIVATE, NULL);
4402                 break;
4403         }
4404         case IMP_EVENT_ACTIVATE: {
4405                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_ACTIVATE, NULL);
4406                 break;
4407         }
4408         default:
4409                 CERROR("Unknown import event %d\n", event);
4410                 LBUG();
4411         }
4412         RETURN(rc);
4413 }
4414
4415 /**
4416  * Determine whether the lock can be canceled before replaying the lock
4417  * during recovery, see bug16774 for detailed information.
4418  *
4419  * \retval zero the lock can't be canceled
4420  * \retval other ok to cancel
4421  */
4422 static int osc_cancel_for_recovery(struct ldlm_lock *lock)
4423 {
4424         check_res_locked(lock->l_resource);
4425
4426         /*
4427          * Cancel all unused extent lock in granted mode LCK_PR or LCK_CR.
4428          *
4429          * XXX as a future improvement, we can also cancel unused write lock
4430          * if it doesn't have dirty data and active mmaps.
4431          */
4432         if (lock->l_resource->lr_type == LDLM_EXTENT &&
4433             (lock->l_granted_mode == LCK_PR ||
4434              lock->l_granted_mode == LCK_CR) &&
4435             (osc_dlm_lock_pageref(lock) == 0))
4436                 RETURN(1);
4437
4438         RETURN(0);
4439 }
4440
4441 int osc_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
4442 {
4443         int rc;
4444         ENTRY;
4445
4446         ENTRY;
4447         rc = ptlrpcd_addref();
4448         if (rc)
4449                 RETURN(rc);
4450
4451         rc = client_obd_setup(obd, lcfg);
4452         if (rc) {
4453                 ptlrpcd_decref();
4454         } else {
4455                 struct lprocfs_static_vars lvars = { 0 };
4456                 struct client_obd *cli = &obd->u.cli;
4457
4458                 cli->cl_grant_shrink_interval = GRANT_SHRINK_INTERVAL;
4459                 lprocfs_osc_init_vars(&lvars);
4460                 if (lprocfs_obd_setup(obd, lvars.obd_vars) == 0) {
4461                         lproc_osc_attach_seqstat(obd);
4462                         sptlrpc_lprocfs_cliobd_attach(obd);
4463                         ptlrpc_lprocfs_register_obd(obd);
4464                 }
4465
4466                 oscc_init(obd);
4467                 /* We need to allocate a few requests more, because
4468                    brw_interpret tries to create new requests before freeing
4469                    previous ones. Ideally we want to have 2x max_rpcs_in_flight
4470                    reserved, but I afraid that might be too much wasted RAM
4471                    in fact, so 2 is just my guess and still should work. */
4472                 cli->cl_import->imp_rq_pool =
4473                         ptlrpc_init_rq_pool(cli->cl_max_rpcs_in_flight + 2,
4474                                             OST_MAXREQSIZE,
4475                                             ptlrpc_add_rqs_to_pool);
4476
4477                 CFS_INIT_LIST_HEAD(&cli->cl_grant_shrink_list);
4478                 cfs_sema_init(&cli->cl_grant_sem, 1);
4479
4480                 ns_register_cancel(obd->obd_namespace, osc_cancel_for_recovery);
4481         }
4482
4483         RETURN(rc);
4484 }
4485
4486 static int osc_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
4487 {
4488         int rc = 0;
4489         ENTRY;
4490
4491         switch (stage) {
4492         case OBD_CLEANUP_EARLY: {
4493                 struct obd_import *imp;
4494                 imp = obd->u.cli.cl_import;
4495                 CDEBUG(D_HA, "Deactivating import %s\n", obd->obd_name);
4496                 /* ptlrpc_abort_inflight to stop an mds_lov_synchronize */
4497                 ptlrpc_deactivate_import(imp);
4498                 cfs_spin_lock(&imp->imp_lock);
4499                 imp->imp_pingable = 0;
4500                 cfs_spin_unlock(&imp->imp_lock);
4501                 break;
4502         }
4503         case OBD_CLEANUP_EXPORTS: {
4504                 /* LU-464
4505                  * for echo client, export may be on zombie list, wait for
4506                  * zombie thread to cull it, because cli.cl_import will be
4507                  * cleared in client_disconnect_export():
4508                  *   class_export_destroy() -> obd_cleanup() ->
4509                  *   echo_device_free() -> echo_client_cleanup() ->
4510                  *   obd_disconnect() -> osc_disconnect() ->
4511                  *   client_disconnect_export()
4512                  */
4513                 obd_zombie_barrier();
4514                 obd_cleanup_client_import(obd);
4515                 ptlrpc_lprocfs_unregister_obd(obd);
4516                 lprocfs_obd_cleanup(obd);
4517                 rc = obd_llog_finish(obd, 0);
4518                 if (rc != 0)
4519                         CERROR("failed to cleanup llogging subsystems\n");
4520                 break;
4521                 }
4522         }
4523         RETURN(rc);
4524 }
4525
4526 int osc_cleanup(struct obd_device *obd)
4527 {
4528         int rc;
4529
4530         ENTRY;
4531
4532         /* free memory of osc quota cache */
4533         lquota_cleanup(quota_interface, obd);
4534
4535         rc = client_obd_cleanup(obd);
4536
4537         ptlrpcd_decref();
4538         RETURN(rc);
4539 }
4540
4541 int osc_process_config_base(struct obd_device *obd, struct lustre_cfg *lcfg)
4542 {
4543         struct lprocfs_static_vars lvars = { 0 };
4544         int rc = 0;
4545
4546         lprocfs_osc_init_vars(&lvars);
4547
4548         switch (lcfg->lcfg_command) {
4549         default:
4550                 rc = class_process_proc_param(PARAM_OSC, lvars.obd_vars,
4551                                               lcfg, obd);
4552                 if (rc > 0)
4553                         rc = 0;
4554                 break;
4555         }
4556
4557         return(rc);
4558 }
4559
4560 static int osc_process_config(struct obd_device *obd, obd_count len, void *buf)
4561 {
4562         return osc_process_config_base(obd, buf);
4563 }
4564
4565 struct obd_ops osc_obd_ops = {
4566         .o_owner                = THIS_MODULE,
4567         .o_setup                = osc_setup,
4568         .o_precleanup           = osc_precleanup,
4569         .o_cleanup              = osc_cleanup,
4570         .o_add_conn             = client_import_add_conn,
4571         .o_del_conn             = client_import_del_conn,
4572         .o_connect              = client_connect_import,
4573         .o_reconnect            = osc_reconnect,
4574         .o_disconnect           = osc_disconnect,
4575         .o_statfs               = osc_statfs,
4576         .o_statfs_async         = osc_statfs_async,
4577         .o_packmd               = osc_packmd,
4578         .o_unpackmd             = osc_unpackmd,
4579         .o_precreate            = osc_precreate,
4580         .o_create               = osc_create,
4581         .o_create_async         = osc_create_async,
4582         .o_destroy              = osc_destroy,
4583         .o_getattr              = osc_getattr,
4584         .o_getattr_async        = osc_getattr_async,
4585         .o_setattr              = osc_setattr,
4586         .o_setattr_async        = osc_setattr_async,
4587         .o_brw                  = osc_brw,
4588         .o_punch                = osc_punch,
4589         .o_sync                 = osc_sync,
4590         .o_enqueue              = osc_enqueue,
4591         .o_change_cbdata        = osc_change_cbdata,
4592         .o_find_cbdata          = osc_find_cbdata,
4593         .o_cancel               = osc_cancel,
4594         .o_cancel_unused        = osc_cancel_unused,
4595         .o_iocontrol            = osc_iocontrol,
4596         .o_get_info             = osc_get_info,
4597         .o_set_info_async       = osc_set_info_async,
4598         .o_import_event         = osc_import_event,
4599         .o_llog_init            = osc_llog_init,
4600         .o_llog_finish          = osc_llog_finish,
4601         .o_process_config       = osc_process_config,
4602 };
4603
4604 extern struct lu_kmem_descr osc_caches[];
4605 extern cfs_spinlock_t       osc_ast_guard;
4606 extern cfs_lock_class_key_t osc_ast_guard_class;
4607
4608 int __init osc_init(void)
4609 {
4610         struct lprocfs_static_vars lvars = { 0 };
4611         int rc;
4612         ENTRY;
4613
4614         /* print an address of _any_ initialized kernel symbol from this
4615          * module, to allow debugging with gdb that doesn't support data
4616          * symbols from modules.*/
4617         CDEBUG(D_CONSOLE, "Lustre OSC module (%p).\n", &osc_caches);
4618
4619         rc = lu_kmem_init(osc_caches);
4620
4621         lprocfs_osc_init_vars(&lvars);
4622
4623         cfs_request_module("lquota");
4624         quota_interface = PORTAL_SYMBOL_GET(osc_quota_interface);
4625         lquota_init(quota_interface);
4626         init_obd_quota_ops(quota_interface, &osc_obd_ops);
4627
4628         rc = class_register_type(&osc_obd_ops, NULL, lvars.module_vars,
4629                                  LUSTRE_OSC_NAME, &osc_device_type);
4630         if (rc) {
4631                 if (quota_interface)
4632                         PORTAL_SYMBOL_PUT(osc_quota_interface);
4633                 lu_kmem_fini(osc_caches);
4634                 RETURN(rc);
4635         }
4636
4637         cfs_spin_lock_init(&osc_ast_guard);
4638         cfs_lockdep_set_class(&osc_ast_guard, &osc_ast_guard_class);
4639
4640         osc_mds_ost_orig_logops = llog_lvfs_ops;
4641         osc_mds_ost_orig_logops.lop_setup = llog_obd_origin_setup;
4642         osc_mds_ost_orig_logops.lop_cleanup = llog_obd_origin_cleanup;
4643         osc_mds_ost_orig_logops.lop_add = llog_obd_origin_add;
4644         osc_mds_ost_orig_logops.lop_connect = llog_origin_connect;
4645
4646         RETURN(rc);
4647 }
4648
4649 #ifdef __KERNEL__
4650 static void /*__exit*/ osc_exit(void)
4651 {
4652         lu_device_type_fini(&osc_device_type);
4653
4654         lquota_exit(quota_interface);
4655         if (quota_interface)
4656                 PORTAL_SYMBOL_PUT(osc_quota_interface);
4657
4658         class_unregister_type(LUSTRE_OSC_NAME);
4659         lu_kmem_fini(osc_caches);
4660 }
4661
4662 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
4663 MODULE_DESCRIPTION("Lustre Object Storage Client (OSC)");
4664 MODULE_LICENSE("GPL");
4665
4666 cfs_module(osc, LUSTRE_VERSION_STRING, osc_init, osc_exit);
4667 #endif