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, PSCOPE_OTHER);
 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, PSCOPE_OTHER);
 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, PSCOPE_OTHER);
 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, PSCOPE_OTHER);
 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|
1223                                   OBD_BRW_NOCACHE|OBD_BRW_SYNC|OBD_BRW_ASYNC);
1224
1225                 /* warn if we try to combine flags that we don't know to be
1226                  * safe to combine */
1227                 if ((p1->flag & mask) != (p2->flag & mask))
1228                         CERROR("is it ok to have flags 0x%x and 0x%x in the "
1229                                "same brw?\n", p1->flag, p2->flag);
1230                 return 0;
1231         }
1232
1233         return (p1->off + p1->count == p2->off);
1234 }
1235
1236 static obd_count osc_checksum_bulk(int nob, obd_count pg_count,
1237                                    struct brw_page **pga, int opc,
1238                                    cksum_type_t cksum_type)
1239 {
1240         __u32 cksum;
1241         int i = 0;
1242
1243         LASSERT (pg_count > 0);
1244         cksum = init_checksum(cksum_type);
1245         while (nob > 0 && pg_count > 0) {
1246                 unsigned char *ptr = cfs_kmap(pga[i]->pg);
1247                 int off = pga[i]->off & ~CFS_PAGE_MASK;
1248                 int count = pga[i]->count > nob ? nob : pga[i]->count;
1249
1250                 /* corrupt the data before we compute the checksum, to
1251                  * simulate an OST->client data error */
1252                 if (i == 0 && opc == OST_READ &&
1253                     OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_RECEIVE))
1254                         memcpy(ptr + off, "bad1", min(4, nob));
1255                 cksum = compute_checksum(cksum, ptr + off, count, cksum_type);
1256                 cfs_kunmap(pga[i]->pg);
1257                 LL_CDEBUG_PAGE(D_PAGE, pga[i]->pg, "off %d checksum %x\n",
1258                                off, cksum);
1259
1260                 nob -= pga[i]->count;
1261                 pg_count--;
1262                 i++;
1263         }
1264         /* For sending we only compute the wrong checksum instead
1265          * of corrupting the data so it is still correct on a redo */
1266         if (opc == OST_WRITE && OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_SEND))
1267                 cksum++;
1268
1269         return cksum;
1270 }
1271
1272 static int osc_brw_prep_request(int cmd, struct client_obd *cli,struct obdo *oa,
1273                                 struct lov_stripe_md *lsm, obd_count page_count,
1274                                 struct brw_page **pga,
1275                                 struct ptlrpc_request **reqp,
1276                                 struct obd_capa *ocapa, int reserve,
1277                                 int resend)
1278 {
1279         struct ptlrpc_request   *req;
1280         struct ptlrpc_bulk_desc *desc;
1281         struct ost_body         *body;
1282         struct obd_ioobj        *ioobj;
1283         struct niobuf_remote    *niobuf;
1284         int niocount, i, requested_nob, opc, rc;
1285         struct osc_brw_async_args *aa;
1286         struct req_capsule      *pill;
1287         struct brw_page *pg_prev;
1288
1289         ENTRY;
1290         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_BRW_PREP_REQ))
1291                 RETURN(-ENOMEM); /* Recoverable */
1292         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_BRW_PREP_REQ2))
1293                 RETURN(-EINVAL); /* Fatal */
1294
1295         if ((cmd & OBD_BRW_WRITE) != 0) {
1296                 opc = OST_WRITE;
1297                 req = ptlrpc_request_alloc_pool(cli->cl_import,
1298                                                 cli->cl_import->imp_rq_pool,
1299                                                 &RQF_OST_BRW_WRITE);
1300         } else {
1301                 opc = OST_READ;
1302                 req = ptlrpc_request_alloc(cli->cl_import, &RQF_OST_BRW_READ);
1303         }
1304         if (req == NULL)
1305                 RETURN(-ENOMEM);
1306
1307         for (niocount = i = 1; i < page_count; i++) {
1308                 if (!can_merge_pages(pga[i - 1], pga[i]))
1309                         niocount++;
1310         }
1311
1312         pill = &req->rq_pill;
1313         req_capsule_set_size(pill, &RMF_OBD_IOOBJ, RCL_CLIENT,
1314                              sizeof(*ioobj));
1315         req_capsule_set_size(pill, &RMF_NIOBUF_REMOTE, RCL_CLIENT,
1316                              niocount * sizeof(*niobuf));
1317         osc_set_capa_size(req, &RMF_CAPA1, ocapa);
1318
1319         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, opc);
1320         if (rc) {
1321                 ptlrpc_request_free(req);
1322                 RETURN(rc);
1323         }
1324         req->rq_request_portal = OST_IO_PORTAL; /* bug 7198 */
1325         ptlrpc_at_set_req_timeout(req);
1326
1327         if (opc == OST_WRITE)
1328                 desc = ptlrpc_prep_bulk_imp(req, page_count,
1329                                             BULK_GET_SOURCE, OST_BULK_PORTAL);
1330         else
1331                 desc = ptlrpc_prep_bulk_imp(req, page_count,
1332                                             BULK_PUT_SINK, OST_BULK_PORTAL);
1333
1334         if (desc == NULL)
1335                 GOTO(out, rc = -ENOMEM);
1336         /* NB request now owns desc and will free it when it gets freed */
1337
1338         body = req_capsule_client_get(pill, &RMF_OST_BODY);
1339         ioobj = req_capsule_client_get(pill, &RMF_OBD_IOOBJ);
1340         niobuf = req_capsule_client_get(pill, &RMF_NIOBUF_REMOTE);
1341         LASSERT(body != NULL && ioobj != NULL && niobuf != NULL);
1342
1343         lustre_set_wire_obdo(&body->oa, oa);
1344
1345         obdo_to_ioobj(oa, ioobj);
1346         ioobj->ioo_bufcnt = niocount;
1347         osc_pack_capa(req, body, ocapa);
1348         LASSERT (page_count > 0);
1349         pg_prev = pga[0];
1350         for (requested_nob = i = 0; i < page_count; i++, niobuf++) {
1351                 struct brw_page *pg = pga[i];
1352                 int poff = pg->off & ~CFS_PAGE_MASK;
1353
1354                 LASSERT(pg->count > 0);
1355                 /* make sure there is no gap in the middle of page array */
1356                 LASSERTF(page_count == 1 ||
1357                          (ergo(i == 0, poff + pg->count == CFS_PAGE_SIZE) &&
1358                           ergo(i > 0 && i < page_count - 1,
1359                                poff == 0 && pg->count == CFS_PAGE_SIZE)   &&
1360                           ergo(i == page_count - 1, poff == 0)),
1361                          "i: %d/%d pg: %p off: "LPU64", count: %u\n",
1362                          i, page_count, pg, pg->off, pg->count);
1363 #ifdef __linux__
1364                 LASSERTF(i == 0 || pg->off > pg_prev->off,
1365                          "i %d p_c %u pg %p [pri %lu ind %lu] off "LPU64
1366                          " prev_pg %p [pri %lu ind %lu] off "LPU64"\n",
1367                          i, page_count,
1368                          pg->pg, page_private(pg->pg), pg->pg->index, pg->off,
1369                          pg_prev->pg, page_private(pg_prev->pg),
1370                          pg_prev->pg->index, pg_prev->off);
1371 #else
1372                 LASSERTF(i == 0 || pg->off > pg_prev->off,
1373                          "i %d p_c %u\n", i, page_count);
1374 #endif
1375                 LASSERT((pga[0]->flag & OBD_BRW_SRVLOCK) ==
1376                         (pg->flag & OBD_BRW_SRVLOCK));
1377
1378                 ptlrpc_prep_bulk_page(desc, pg->pg, poff, pg->count);
1379                 requested_nob += pg->count;
1380
1381                 if (i > 0 && can_merge_pages(pg_prev, pg)) {
1382                         niobuf--;
1383                         niobuf->len += pg->count;
1384                 } else {
1385                         niobuf->offset = pg->off;
1386                         niobuf->len    = pg->count;
1387                         niobuf->flags  = pg->flag;
1388                 }
1389                 pg_prev = pg;
1390         }
1391
1392         LASSERTF((void *)(niobuf - niocount) ==
1393                 req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE),
1394                 "want %p - real %p\n", req_capsule_client_get(&req->rq_pill,
1395                 &RMF_NIOBUF_REMOTE), (void *)(niobuf - niocount));
1396
1397         osc_announce_cached(cli, &body->oa, opc == OST_WRITE ? requested_nob:0);
1398         if (resend) {
1399                 if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0) {
1400                         body->oa.o_valid |= OBD_MD_FLFLAGS;
1401                         body->oa.o_flags = 0;
1402                 }
1403                 body->oa.o_flags |= OBD_FL_RECOV_RESEND;
1404         }
1405
1406         if (osc_should_shrink_grant(cli))
1407                 osc_shrink_grant_local(cli, &body->oa);
1408
1409         /* size[REQ_REC_OFF] still sizeof (*body) */
1410         if (opc == OST_WRITE) {
1411                 if (unlikely(cli->cl_checksum) &&
1412                     !sptlrpc_flavor_has_bulk(&req->rq_flvr)) {
1413                         /* store cl_cksum_type in a local variable since
1414                          * it can be changed via lprocfs */
1415                         cksum_type_t cksum_type = cli->cl_cksum_type;
1416
1417                         if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0) {
1418                                 oa->o_flags &= OBD_FL_LOCAL_MASK;
1419                                 body->oa.o_flags = 0;
1420                         }
1421                         body->oa.o_flags |= cksum_type_pack(cksum_type);
1422                         body->oa.o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1423                         body->oa.o_cksum = osc_checksum_bulk(requested_nob,
1424                                                              page_count, pga,
1425                                                              OST_WRITE,
1426                                                              cksum_type);
1427                         CDEBUG(D_PAGE, "checksum at write origin: %x\n",
1428                                body->oa.o_cksum);
1429                         /* save this in 'oa', too, for later checking */
1430                         oa->o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1431                         oa->o_flags |= cksum_type_pack(cksum_type);
1432                 } else {
1433                         /* clear out the checksum flag, in case this is a
1434                          * resend but cl_checksum is no longer set. b=11238 */
1435                         oa->o_valid &= ~OBD_MD_FLCKSUM;
1436                 }
1437                 oa->o_cksum = body->oa.o_cksum;
1438                 /* 1 RC per niobuf */
1439                 req_capsule_set_size(pill, &RMF_RCS, RCL_SERVER,
1440                                      sizeof(__u32) * niocount);
1441         } else {
1442                 if (unlikely(cli->cl_checksum) &&
1443                     !sptlrpc_flavor_has_bulk(&req->rq_flvr)) {
1444                         if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0)
1445                                 body->oa.o_flags = 0;
1446                         body->oa.o_flags |= cksum_type_pack(cli->cl_cksum_type);
1447                         body->oa.o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1448                 }
1449         }
1450         ptlrpc_request_set_replen(req);
1451
1452         CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
1453         aa = ptlrpc_req_async_args(req);
1454         aa->aa_oa = oa;
1455         aa->aa_requested_nob = requested_nob;
1456         aa->aa_nio_count = niocount;
1457         aa->aa_page_count = page_count;
1458         aa->aa_resends = 0;
1459         aa->aa_ppga = pga;
1460         aa->aa_cli = cli;
1461         CFS_INIT_LIST_HEAD(&aa->aa_oaps);
1462         if (ocapa && reserve)
1463                 aa->aa_ocapa = capa_get(ocapa);
1464
1465         *reqp = req;
1466         RETURN(0);
1467
1468  out:
1469         ptlrpc_req_finished(req);
1470         RETURN(rc);
1471 }
1472
1473 static int check_write_checksum(struct obdo *oa, const lnet_process_id_t *peer,
1474                                 __u32 client_cksum, __u32 server_cksum, int nob,
1475                                 obd_count page_count, struct brw_page **pga,
1476                                 cksum_type_t client_cksum_type)
1477 {
1478         __u32 new_cksum;
1479         char *msg;
1480         cksum_type_t cksum_type;
1481
1482         if (server_cksum == client_cksum) {
1483                 CDEBUG(D_PAGE, "checksum %x confirmed\n", client_cksum);
1484                 return 0;
1485         }
1486
1487         /* If this is mmaped file - it can be changed at any time */
1488         if (oa->o_valid & OBD_MD_FLFLAGS && oa->o_flags & OBD_FL_MMAP)
1489                 return 1;
1490
1491         cksum_type = cksum_type_unpack(oa->o_valid & OBD_MD_FLFLAGS ?
1492                                        oa->o_flags : 0);
1493         new_cksum = osc_checksum_bulk(nob, page_count, pga, OST_WRITE,
1494                                       cksum_type);
1495
1496         if (cksum_type != client_cksum_type)
1497                 msg = "the server did not use the checksum type specified in "
1498                       "the original request - likely a protocol problem";
1499         else if (new_cksum == server_cksum)
1500                 msg = "changed on the client after we checksummed it - "
1501                       "likely false positive due to mmap IO (bug 11742)";
1502         else if (new_cksum == client_cksum)
1503                 msg = "changed in transit before arrival at OST";
1504         else
1505                 msg = "changed in transit AND doesn't match the original - "
1506                       "likely false positive due to mmap IO (bug 11742)";
1507
1508         LCONSOLE_ERROR_MSG(0x132, "BAD WRITE CHECKSUM: %s: from %s inode "DFID
1509                            " object "LPU64"/"LPU64" extent ["LPU64"-"LPU64"]\n",
1510                            msg, libcfs_nid2str(peer->nid),
1511                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_seq : (__u64)0,
1512                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_oid : 0,
1513                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_ver : 0,
1514                            oa->o_id,
1515                            oa->o_valid & OBD_MD_FLGROUP ? oa->o_seq : (__u64)0,
1516                            pga[0]->off,
1517                            pga[page_count-1]->off + pga[page_count-1]->count - 1);
1518         CERROR("original client csum %x (type %x), server csum %x (type %x), "
1519                "client csum now %x\n", client_cksum, client_cksum_type,
1520                server_cksum, cksum_type, new_cksum);
1521         return 1;
1522 }
1523
1524 /* Note rc enters this function as number of bytes transferred */
1525 static int osc_brw_fini_request(struct ptlrpc_request *req, int rc)
1526 {
1527         struct osc_brw_async_args *aa = (void *)&req->rq_async_args;
1528         const lnet_process_id_t *peer =
1529                         &req->rq_import->imp_connection->c_peer;
1530         struct client_obd *cli = aa->aa_cli;
1531         struct ost_body *body;
1532         __u32 client_cksum = 0;
1533         ENTRY;
1534
1535         if (rc < 0 && rc != -EDQUOT) {
1536                 DEBUG_REQ(D_INFO, req, "Failed request with rc = %d\n", rc);
1537                 RETURN(rc);
1538         }
1539
1540         LASSERTF(req->rq_repmsg != NULL, "rc = %d\n", rc);
1541         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
1542         if (body == NULL) {
1543                 DEBUG_REQ(D_INFO, req, "Can't unpack body\n");
1544                 RETURN(-EPROTO);
1545         }
1546
1547 #ifdef HAVE_QUOTA_SUPPORT
1548         /* set/clear over quota flag for a uid/gid */
1549         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE &&
1550             body->oa.o_valid & (OBD_MD_FLUSRQUOTA | OBD_MD_FLGRPQUOTA)) {
1551                 unsigned int qid[MAXQUOTAS] = { body->oa.o_uid, body->oa.o_gid };
1552
1553                 CDEBUG(D_QUOTA, "setdq for [%u %u] with valid "LPX64", flags %x\n",
1554                        body->oa.o_uid, body->oa.o_gid, body->oa.o_valid,
1555                        body->oa.o_flags);
1556                 lquota_setdq(quota_interface, cli, qid, body->oa.o_valid,
1557                              body->oa.o_flags);
1558         }
1559 #endif
1560
1561         osc_update_grant(cli, body);
1562
1563         if (rc < 0)
1564                 RETURN(rc);
1565
1566         if (aa->aa_oa->o_valid & OBD_MD_FLCKSUM)
1567                 client_cksum = aa->aa_oa->o_cksum; /* save for later */
1568
1569         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE) {
1570                 if (rc > 0) {
1571                         CERROR("Unexpected +ve rc %d\n", rc);
1572                         RETURN(-EPROTO);
1573                 }
1574                 LASSERT(req->rq_bulk->bd_nob == aa->aa_requested_nob);
1575
1576                 if (sptlrpc_cli_unwrap_bulk_write(req, req->rq_bulk))
1577                         RETURN(-EAGAIN);
1578
1579                 if ((aa->aa_oa->o_valid & OBD_MD_FLCKSUM) && client_cksum &&
1580                     check_write_checksum(&body->oa, peer, client_cksum,
1581                                          body->oa.o_cksum, aa->aa_requested_nob,
1582                                          aa->aa_page_count, aa->aa_ppga,
1583                                          cksum_type_unpack(aa->aa_oa->o_flags)))
1584                         RETURN(-EAGAIN);
1585
1586                 rc = check_write_rcs(req, aa->aa_requested_nob,aa->aa_nio_count,
1587                                      aa->aa_page_count, aa->aa_ppga);
1588                 GOTO(out, rc);
1589         }
1590
1591         /* The rest of this function executes only for OST_READs */
1592
1593         /* if unwrap_bulk failed, return -EAGAIN to retry */
1594         rc = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk, rc);
1595         if (rc < 0)
1596                 GOTO(out, rc = -EAGAIN);
1597
1598         if (rc > aa->aa_requested_nob) {
1599                 CERROR("Unexpected rc %d (%d requested)\n", rc,
1600                        aa->aa_requested_nob);
1601                 RETURN(-EPROTO);
1602         }
1603
1604         if (rc != req->rq_bulk->bd_nob_transferred) {
1605                 CERROR ("Unexpected rc %d (%d transferred)\n",
1606                         rc, req->rq_bulk->bd_nob_transferred);
1607                 return (-EPROTO);
1608         }
1609
1610         if (rc < aa->aa_requested_nob)
1611                 handle_short_read(rc, aa->aa_page_count, aa->aa_ppga);
1612
1613         if (body->oa.o_valid & OBD_MD_FLCKSUM) {
1614                 static int cksum_counter;
1615                 __u32      server_cksum = body->oa.o_cksum;
1616                 char      *via;
1617                 char      *router;
1618                 cksum_type_t cksum_type;
1619
1620                 cksum_type = cksum_type_unpack(body->oa.o_valid &OBD_MD_FLFLAGS?
1621                                                body->oa.o_flags : 0);
1622                 client_cksum = osc_checksum_bulk(rc, aa->aa_page_count,
1623                                                  aa->aa_ppga, OST_READ,
1624                                                  cksum_type);
1625
1626                 if (peer->nid == req->rq_bulk->bd_sender) {
1627                         via = router = "";
1628                 } else {
1629                         via = " via ";
1630                         router = libcfs_nid2str(req->rq_bulk->bd_sender);
1631                 }
1632
1633                 if (server_cksum == ~0 && rc > 0) {
1634                         CERROR("Protocol error: server %s set the 'checksum' "
1635                                "bit, but didn't send a checksum.  Not fatal, "
1636                                "but please notify on http://bugs.whamcloud.com/\n",
1637                                libcfs_nid2str(peer->nid));
1638                 } else if (server_cksum != client_cksum) {
1639                         LCONSOLE_ERROR_MSG(0x133, "%s: BAD READ CHECKSUM: from "
1640                                            "%s%s%s inode "DFID" object "
1641                                            LPU64"/"LPU64" extent "
1642                                            "["LPU64"-"LPU64"]\n",
1643                                            req->rq_import->imp_obd->obd_name,
1644                                            libcfs_nid2str(peer->nid),
1645                                            via, router,
1646                                            body->oa.o_valid & OBD_MD_FLFID ?
1647                                                 body->oa.o_parent_seq : (__u64)0,
1648                                            body->oa.o_valid & OBD_MD_FLFID ?
1649                                                 body->oa.o_parent_oid : 0,
1650                                            body->oa.o_valid & OBD_MD_FLFID ?
1651                                                 body->oa.o_parent_ver : 0,
1652                                            body->oa.o_id,
1653                                            body->oa.o_valid & OBD_MD_FLGROUP ?
1654                                                 body->oa.o_seq : (__u64)0,
1655                                            aa->aa_ppga[0]->off,
1656                                            aa->aa_ppga[aa->aa_page_count-1]->off +
1657                                            aa->aa_ppga[aa->aa_page_count-1]->count -
1658                                                                         1);
1659                         CERROR("client %x, server %x, cksum_type %x\n",
1660                                client_cksum, server_cksum, cksum_type);
1661                         cksum_counter = 0;
1662                         aa->aa_oa->o_cksum = client_cksum;
1663                         rc = -EAGAIN;
1664                 } else {
1665                         cksum_counter++;
1666                         CDEBUG(D_PAGE, "checksum %x confirmed\n", client_cksum);
1667                         rc = 0;
1668                 }
1669         } else if (unlikely(client_cksum)) {
1670                 static int cksum_missed;
1671
1672                 cksum_missed++;
1673                 if ((cksum_missed & (-cksum_missed)) == cksum_missed)
1674                         CERROR("Checksum %u requested from %s but not sent\n",
1675                                cksum_missed, libcfs_nid2str(peer->nid));
1676         } else {
1677                 rc = 0;
1678         }
1679 out:
1680         if (rc >= 0)
1681                 lustre_get_wire_obdo(aa->aa_oa, &body->oa);
1682
1683         RETURN(rc);
1684 }
1685
1686 static int osc_brw_internal(int cmd, struct obd_export *exp, struct obdo *oa,
1687                             struct lov_stripe_md *lsm,
1688                             obd_count page_count, struct brw_page **pga,
1689                             struct obd_capa *ocapa)
1690 {
1691         struct ptlrpc_request *req;
1692         int                    rc;
1693         cfs_waitq_t            waitq;
1694         int                    resends = 0;
1695         struct l_wait_info     lwi;
1696
1697         ENTRY;
1698
1699         cfs_waitq_init(&waitq);
1700
1701 restart_bulk:
1702         rc = osc_brw_prep_request(cmd, &exp->exp_obd->u.cli, oa, lsm,
1703                                   page_count, pga, &req, ocapa, 0, resends);
1704         if (rc != 0)
1705                 return (rc);
1706
1707         rc = ptlrpc_queue_wait(req);
1708
1709         if (rc == -ETIMEDOUT && req->rq_resend) {
1710                 DEBUG_REQ(D_HA, req,  "BULK TIMEOUT");
1711                 ptlrpc_req_finished(req);
1712                 goto restart_bulk;
1713         }
1714
1715         rc = osc_brw_fini_request(req, rc);
1716
1717         ptlrpc_req_finished(req);
1718         if (osc_recoverable_error(rc)) {
1719                 resends++;
1720                 if (!client_should_resend(resends, &exp->exp_obd->u.cli)) {
1721                         CERROR("too many resend retries, returning error\n");
1722                         RETURN(-EIO);
1723                 }
1724
1725                 lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(resends), NULL, NULL, NULL);
1726                 l_wait_event(waitq, 0, &lwi);
1727
1728                 goto restart_bulk;
1729         }
1730
1731         RETURN (rc);
1732 }
1733
1734 int osc_brw_redo_request(struct ptlrpc_request *request,
1735                          struct osc_brw_async_args *aa)
1736 {
1737         struct ptlrpc_request *new_req;
1738         struct ptlrpc_request_set *set = request->rq_set;
1739         struct osc_brw_async_args *new_aa;
1740         struct osc_async_page *oap;
1741         int rc = 0;
1742         ENTRY;
1743
1744         if (!client_should_resend(aa->aa_resends, aa->aa_cli)) {
1745                 CERROR("too many resent retries, returning error\n");
1746                 RETURN(-EIO);
1747         }
1748
1749         DEBUG_REQ(D_ERROR, request, "redo for recoverable error");
1750
1751         rc = osc_brw_prep_request(lustre_msg_get_opc(request->rq_reqmsg) ==
1752                                         OST_WRITE ? OBD_BRW_WRITE :OBD_BRW_READ,
1753                                   aa->aa_cli, aa->aa_oa,
1754                                   NULL /* lsm unused by osc currently */,
1755                                   aa->aa_page_count, aa->aa_ppga,
1756                                   &new_req, aa->aa_ocapa, 0, 1);
1757         if (rc)
1758                 RETURN(rc);
1759
1760         client_obd_list_lock(&aa->aa_cli->cl_loi_list_lock);
1761
1762         cfs_list_for_each_entry(oap, &aa->aa_oaps, oap_rpc_item) {
1763                 if (oap->oap_request != NULL) {
1764                         LASSERTF(request == oap->oap_request,
1765                                  "request %p != oap_request %p\n",
1766                                  request, oap->oap_request);
1767                         if (oap->oap_interrupted) {
1768                                 client_obd_list_unlock(&aa->aa_cli->cl_loi_list_lock);
1769                                 ptlrpc_req_finished(new_req);
1770                                 RETURN(-EINTR);
1771                         }
1772                 }
1773         }
1774         /* New request takes over pga and oaps from old request.
1775          * Note that copying a list_head doesn't work, need to move it... */
1776         aa->aa_resends++;
1777         new_req->rq_interpret_reply = request->rq_interpret_reply;
1778         new_req->rq_async_args = request->rq_async_args;
1779         new_req->rq_sent = cfs_time_current_sec() + aa->aa_resends;
1780
1781         new_aa = ptlrpc_req_async_args(new_req);
1782
1783         CFS_INIT_LIST_HEAD(&new_aa->aa_oaps);
1784         cfs_list_splice(&aa->aa_oaps, &new_aa->aa_oaps);
1785         CFS_INIT_LIST_HEAD(&aa->aa_oaps);
1786
1787         cfs_list_for_each_entry(oap, &new_aa->aa_oaps, oap_rpc_item) {
1788                 if (oap->oap_request) {
1789                         ptlrpc_req_finished(oap->oap_request);
1790                         oap->oap_request = ptlrpc_request_addref(new_req);
1791                 }
1792         }
1793
1794         new_aa->aa_ocapa = aa->aa_ocapa;
1795         aa->aa_ocapa = NULL;
1796
1797         /* use ptlrpc_set_add_req is safe because interpret functions work
1798          * in check_set context. only one way exist with access to request
1799          * from different thread got -EINTR - this way protected with
1800          * cl_loi_list_lock */
1801         ptlrpc_set_add_req(set, new_req);
1802
1803         client_obd_list_unlock(&aa->aa_cli->cl_loi_list_lock);
1804
1805         DEBUG_REQ(D_INFO, new_req, "new request");
1806         RETURN(0);
1807 }
1808
1809 /*
1810  * ugh, we want disk allocation on the target to happen in offset order.  we'll
1811  * follow sedgewicks advice and stick to the dead simple shellsort -- it'll do
1812  * fine for our small page arrays and doesn't require allocation.  its an
1813  * insertion sort that swaps elements that are strides apart, shrinking the
1814  * stride down until its '1' and the array is sorted.
1815  */
1816 static void sort_brw_pages(struct brw_page **array, int num)
1817 {
1818         int stride, i, j;
1819         struct brw_page *tmp;
1820
1821         if (num == 1)
1822                 return;
1823         for (stride = 1; stride < num ; stride = (stride * 3) + 1)
1824                 ;
1825
1826         do {
1827                 stride /= 3;
1828                 for (i = stride ; i < num ; i++) {
1829                         tmp = array[i];
1830                         j = i;
1831                         while (j >= stride && array[j - stride]->off > tmp->off) {
1832                                 array[j] = array[j - stride];
1833                                 j -= stride;
1834                         }
1835                         array[j] = tmp;
1836                 }
1837         } while (stride > 1);
1838 }
1839
1840 static obd_count max_unfragmented_pages(struct brw_page **pg, obd_count pages)
1841 {
1842         int count = 1;
1843         int offset;
1844         int i = 0;
1845
1846         LASSERT (pages > 0);
1847         offset = pg[i]->off & ~CFS_PAGE_MASK;
1848
1849         for (;;) {
1850                 pages--;
1851                 if (pages == 0)         /* that's all */
1852                         return count;
1853
1854                 if (offset + pg[i]->count < CFS_PAGE_SIZE)
1855                         return count;   /* doesn't end on page boundary */
1856
1857                 i++;
1858                 offset = pg[i]->off & ~CFS_PAGE_MASK;
1859                 if (offset != 0)        /* doesn't start on page boundary */
1860                         return count;
1861
1862                 count++;
1863         }
1864 }
1865
1866 static struct brw_page **osc_build_ppga(struct brw_page *pga, obd_count count)
1867 {
1868         struct brw_page **ppga;
1869         int i;
1870
1871         OBD_ALLOC(ppga, sizeof(*ppga) * count);
1872         if (ppga == NULL)
1873                 return NULL;
1874
1875         for (i = 0; i < count; i++)
1876                 ppga[i] = pga + i;
1877         return ppga;
1878 }
1879
1880 static void osc_release_ppga(struct brw_page **ppga, obd_count count)
1881 {
1882         LASSERT(ppga != NULL);
1883         OBD_FREE(ppga, sizeof(*ppga) * count);
1884 }
1885
1886 static int osc_brw(int cmd, struct obd_export *exp, struct obd_info *oinfo,
1887                    obd_count page_count, struct brw_page *pga,
1888                    struct obd_trans_info *oti)
1889 {
1890         struct obdo *saved_oa = NULL;
1891         struct brw_page **ppga, **orig;
1892         struct obd_import *imp = class_exp2cliimp(exp);
1893         struct client_obd *cli;
1894         int rc, page_count_orig;
1895         ENTRY;
1896
1897         LASSERT((imp != NULL) && (imp->imp_obd != NULL));
1898         cli = &imp->imp_obd->u.cli;
1899
1900         if (cmd & OBD_BRW_CHECK) {
1901                 /* The caller just wants to know if there's a chance that this
1902                  * I/O can succeed */
1903
1904                 if (imp->imp_invalid)
1905                         RETURN(-EIO);
1906                 RETURN(0);
1907         }
1908
1909         /* test_brw with a failed create can trip this, maybe others. */
1910         LASSERT(cli->cl_max_pages_per_rpc);
1911
1912         rc = 0;
1913
1914         orig = ppga = osc_build_ppga(pga, page_count);
1915         if (ppga == NULL)
1916                 RETURN(-ENOMEM);
1917         page_count_orig = page_count;
1918
1919         sort_brw_pages(ppga, page_count);
1920         while (page_count) {
1921                 obd_count pages_per_brw;
1922
1923                 if (page_count > cli->cl_max_pages_per_rpc)
1924                         pages_per_brw = cli->cl_max_pages_per_rpc;
1925                 else
1926                         pages_per_brw = page_count;
1927
1928                 pages_per_brw = max_unfragmented_pages(ppga, pages_per_brw);
1929
1930                 if (saved_oa != NULL) {
1931                         /* restore previously saved oa */
1932                         *oinfo->oi_oa = *saved_oa;
1933                 } else if (page_count > pages_per_brw) {
1934                         /* save a copy of oa (brw will clobber it) */
1935                         OBDO_ALLOC(saved_oa);
1936                         if (saved_oa == NULL)
1937                                 GOTO(out, rc = -ENOMEM);
1938                         *saved_oa = *oinfo->oi_oa;
1939                 }
1940
1941                 rc = osc_brw_internal(cmd, exp, oinfo->oi_oa, oinfo->oi_md,
1942                                       pages_per_brw, ppga, oinfo->oi_capa);
1943
1944                 if (rc != 0)
1945                         break;
1946
1947                 page_count -= pages_per_brw;
1948                 ppga += pages_per_brw;
1949         }
1950
1951 out:
1952         osc_release_ppga(orig, page_count_orig);
1953
1954         if (saved_oa != NULL)
1955                 OBDO_FREE(saved_oa);
1956
1957         RETURN(rc);
1958 }
1959
1960 /* The companion to osc_enter_cache(), called when @oap is no longer part of
1961  * the dirty accounting.  Writeback completes or truncate happens before
1962  * writing starts.  Must be called with the loi lock held. */
1963 static void osc_exit_cache(struct client_obd *cli, struct osc_async_page *oap,
1964                            int sent)
1965 {
1966         osc_release_write_grant(cli, &oap->oap_brw_page, sent);
1967 }
1968
1969
1970 /* This maintains the lists of pending pages to read/write for a given object
1971  * (lop).  This is used by osc_check_rpcs->osc_next_loi() and loi_list_maint()
1972  * to quickly find objects that are ready to send an RPC. */
1973 static int lop_makes_rpc(struct client_obd *cli, struct loi_oap_pages *lop,
1974                          int cmd)
1975 {
1976         int optimal;
1977         ENTRY;
1978
1979         if (lop->lop_num_pending == 0)
1980                 RETURN(0);
1981
1982         /* if we have an invalid import we want to drain the queued pages
1983          * by forcing them through rpcs that immediately fail and complete
1984          * the pages.  recovery relies on this to empty the queued pages
1985          * before canceling the locks and evicting down the llite pages */
1986         if (cli->cl_import == NULL || cli->cl_import->imp_invalid)
1987                 RETURN(1);
1988
1989         /* stream rpcs in queue order as long as as there is an urgent page
1990          * queued.  this is our cheap solution for good batching in the case
1991          * where writepage marks some random page in the middle of the file
1992          * as urgent because of, say, memory pressure */
1993         if (!cfs_list_empty(&lop->lop_urgent)) {
1994                 CDEBUG(D_CACHE, "urgent request forcing RPC\n");
1995                 RETURN(1);
1996         }
1997         /* fire off rpcs when we have 'optimal' rpcs as tuned for the wire. */
1998         optimal = cli->cl_max_pages_per_rpc;
1999         if (cmd & OBD_BRW_WRITE) {
2000                 /* trigger a write rpc stream as long as there are dirtiers
2001                  * waiting for space.  as they're waiting, they're not going to
2002                  * create more pages to coalesce with what's waiting.. */
2003                 if (!cfs_list_empty(&cli->cl_cache_waiters)) {
2004                         CDEBUG(D_CACHE, "cache waiters forcing RPC\n");
2005                         RETURN(1);
2006                 }
2007                 /* +16 to avoid triggering rpcs that would want to include pages
2008                  * that are being queued but which can't be made ready until
2009                  * the queuer finishes with the page. this is a wart for
2010                  * llite::commit_write() */
2011                 optimal += 16;
2012         }
2013         if (lop->lop_num_pending >= optimal)
2014                 RETURN(1);
2015
2016         RETURN(0);
2017 }
2018
2019 static int lop_makes_hprpc(struct loi_oap_pages *lop)
2020 {
2021         struct osc_async_page *oap;
2022         ENTRY;
2023
2024         if (cfs_list_empty(&lop->lop_urgent))
2025                 RETURN(0);
2026
2027         oap = cfs_list_entry(lop->lop_urgent.next,
2028                          struct osc_async_page, oap_urgent_item);
2029
2030         if (oap->oap_async_flags & ASYNC_HP) {
2031                 CDEBUG(D_CACHE, "hp request forcing RPC\n");
2032                 RETURN(1);
2033         }
2034
2035         RETURN(0);
2036 }
2037
2038 static void on_list(cfs_list_t *item, cfs_list_t *list,
2039                     int should_be_on)
2040 {
2041         if (cfs_list_empty(item) && should_be_on)
2042                 cfs_list_add_tail(item, list);
2043         else if (!cfs_list_empty(item) && !should_be_on)
2044                 cfs_list_del_init(item);
2045 }
2046
2047 /* maintain the loi's cli list membership invariants so that osc_send_oap_rpc
2048  * can find pages to build into rpcs quickly */
2049 void loi_list_maint(struct client_obd *cli, struct lov_oinfo *loi)
2050 {
2051         if (lop_makes_hprpc(&loi->loi_write_lop) ||
2052             lop_makes_hprpc(&loi->loi_read_lop)) {
2053                 /* HP rpc */
2054                 on_list(&loi->loi_ready_item, &cli->cl_loi_ready_list, 0);
2055                 on_list(&loi->loi_hp_ready_item, &cli->cl_loi_hp_ready_list, 1);
2056         } else {
2057                 on_list(&loi->loi_hp_ready_item, &cli->cl_loi_hp_ready_list, 0);
2058                 on_list(&loi->loi_ready_item, &cli->cl_loi_ready_list,
2059                         lop_makes_rpc(cli, &loi->loi_write_lop, OBD_BRW_WRITE)||
2060                         lop_makes_rpc(cli, &loi->loi_read_lop, OBD_BRW_READ));
2061         }
2062
2063         on_list(&loi->loi_write_item, &cli->cl_loi_write_list,
2064                 loi->loi_write_lop.lop_num_pending);
2065
2066         on_list(&loi->loi_read_item, &cli->cl_loi_read_list,
2067                 loi->loi_read_lop.lop_num_pending);
2068 }
2069
2070 static void lop_update_pending(struct client_obd *cli,
2071                                struct loi_oap_pages *lop, int cmd, int delta)
2072 {
2073         lop->lop_num_pending += delta;
2074         if (cmd & OBD_BRW_WRITE)
2075                 cli->cl_pending_w_pages += delta;
2076         else
2077                 cli->cl_pending_r_pages += delta;
2078 }
2079
2080 /**
2081  * this is called when a sync waiter receives an interruption.  Its job is to
2082  * get the caller woken as soon as possible.  If its page hasn't been put in an
2083  * rpc yet it can dequeue immediately.  Otherwise it has to mark the rpc as
2084  * desiring interruption which will forcefully complete the rpc once the rpc
2085  * has timed out.
2086  */
2087 int osc_oap_interrupted(const struct lu_env *env, struct osc_async_page *oap)
2088 {
2089         struct loi_oap_pages *lop;
2090         struct lov_oinfo *loi;
2091         int rc = -EBUSY;
2092         ENTRY;
2093
2094         LASSERT(!oap->oap_interrupted);
2095         oap->oap_interrupted = 1;
2096
2097         /* ok, it's been put in an rpc. only one oap gets a request reference */
2098         if (oap->oap_request != NULL) {
2099                 ptlrpc_mark_interrupted(oap->oap_request);
2100                 ptlrpcd_wake(oap->oap_request);
2101                 ptlrpc_req_finished(oap->oap_request);
2102                 oap->oap_request = NULL;
2103         }
2104
2105         /*
2106          * page completion may be called only if ->cpo_prep() method was
2107          * executed by osc_io_submit(), that also adds page the to pending list
2108          */
2109         if (!cfs_list_empty(&oap->oap_pending_item)) {
2110                 cfs_list_del_init(&oap->oap_pending_item);
2111                 cfs_list_del_init(&oap->oap_urgent_item);
2112
2113                 loi = oap->oap_loi;
2114                 lop = (oap->oap_cmd & OBD_BRW_WRITE) ?
2115                         &loi->loi_write_lop : &loi->loi_read_lop;
2116                 lop_update_pending(oap->oap_cli, lop, oap->oap_cmd, -1);
2117                 loi_list_maint(oap->oap_cli, oap->oap_loi);
2118                 rc = oap->oap_caller_ops->ap_completion(env,
2119                                           oap->oap_caller_data,
2120                                           oap->oap_cmd, NULL, -EINTR);
2121         }
2122
2123         RETURN(rc);
2124 }
2125
2126 /* this is trying to propogate async writeback errors back up to the
2127  * application.  As an async write fails we record the error code for later if
2128  * the app does an fsync.  As long as errors persist we force future rpcs to be
2129  * sync so that the app can get a sync error and break the cycle of queueing
2130  * pages for which writeback will fail. */
2131 static void osc_process_ar(struct osc_async_rc *ar, __u64 xid,
2132                            int rc)
2133 {
2134         if (rc) {
2135                 if (!ar->ar_rc)
2136                         ar->ar_rc = rc;
2137
2138                 ar->ar_force_sync = 1;
2139                 ar->ar_min_xid = ptlrpc_sample_next_xid();
2140                 return;
2141
2142         }
2143
2144         if (ar->ar_force_sync && (xid >= ar->ar_min_xid))
2145                 ar->ar_force_sync = 0;
2146 }
2147
2148 void osc_oap_to_pending(struct osc_async_page *oap)
2149 {
2150         struct loi_oap_pages *lop;
2151
2152         if (oap->oap_cmd & OBD_BRW_WRITE)
2153                 lop = &oap->oap_loi->loi_write_lop;
2154         else
2155                 lop = &oap->oap_loi->loi_read_lop;
2156
2157         if (oap->oap_async_flags & ASYNC_HP)
2158                 cfs_list_add(&oap->oap_urgent_item, &lop->lop_urgent);
2159         else if (oap->oap_async_flags & ASYNC_URGENT)
2160                 cfs_list_add_tail(&oap->oap_urgent_item, &lop->lop_urgent);
2161         cfs_list_add_tail(&oap->oap_pending_item, &lop->lop_pending);
2162         lop_update_pending(oap->oap_cli, lop, oap->oap_cmd, 1);
2163 }
2164
2165 /* this must be called holding the loi list lock to give coverage to exit_cache,
2166  * async_flag maintenance, and oap_request */
2167 static void osc_ap_completion(const struct lu_env *env,
2168                               struct client_obd *cli, struct obdo *oa,
2169                               struct osc_async_page *oap, int sent, int rc)
2170 {
2171         __u64 xid = 0;
2172
2173         ENTRY;
2174         if (oap->oap_request != NULL) {
2175                 xid = ptlrpc_req_xid(oap->oap_request);
2176                 ptlrpc_req_finished(oap->oap_request);
2177                 oap->oap_request = NULL;
2178         }
2179
2180         cfs_spin_lock(&oap->oap_lock);
2181         oap->oap_async_flags = 0;
2182         cfs_spin_unlock(&oap->oap_lock);
2183         oap->oap_interrupted = 0;
2184
2185         if (oap->oap_cmd & OBD_BRW_WRITE) {
2186                 osc_process_ar(&cli->cl_ar, xid, rc);
2187                 osc_process_ar(&oap->oap_loi->loi_ar, xid, rc);
2188         }
2189
2190         if (rc == 0 && oa != NULL) {
2191                 if (oa->o_valid & OBD_MD_FLBLOCKS)
2192                         oap->oap_loi->loi_lvb.lvb_blocks = oa->o_blocks;
2193                 if (oa->o_valid & OBD_MD_FLMTIME)
2194                         oap->oap_loi->loi_lvb.lvb_mtime = oa->o_mtime;
2195                 if (oa->o_valid & OBD_MD_FLATIME)
2196                         oap->oap_loi->loi_lvb.lvb_atime = oa->o_atime;
2197                 if (oa->o_valid & OBD_MD_FLCTIME)
2198                         oap->oap_loi->loi_lvb.lvb_ctime = oa->o_ctime;
2199         }
2200
2201         rc = oap->oap_caller_ops->ap_completion(env, oap->oap_caller_data,
2202                                                 oap->oap_cmd, oa, rc);
2203
2204         /* ll_ap_completion (from llite) drops PG_locked. so, a new
2205          * I/O on the page could start, but OSC calls it under lock
2206          * and thus we can add oap back to pending safely */
2207         if (rc)
2208                 /* upper layer wants to leave the page on pending queue */
2209                 osc_oap_to_pending(oap);
2210         else
2211                 osc_exit_cache(cli, oap, sent);
2212         EXIT;
2213 }
2214
2215 static int brw_interpret(const struct lu_env *env,
2216                          struct ptlrpc_request *req, void *data, int rc)
2217 {
2218         struct osc_brw_async_args *aa = data;
2219         struct client_obd *cli;
2220         int async;
2221         ENTRY;
2222
2223         rc = osc_brw_fini_request(req, rc);
2224         CDEBUG(D_INODE, "request %p aa %p rc %d\n", req, aa, rc);
2225         if (osc_recoverable_error(rc)) {
2226                 /* Only retry once for mmaped files since the mmaped page
2227                  * might be modified at anytime. We have to retry at least
2228                  * once in case there WAS really a corruption of the page
2229                  * on the network, that was not caused by mmap() modifying
2230                  * the page. Bug11742 */
2231                 if ((rc == -EAGAIN) && (aa->aa_resends > 0) &&
2232                     aa->aa_oa->o_valid & OBD_MD_FLFLAGS &&
2233                     aa->aa_oa->o_flags & OBD_FL_MMAP) {
2234                         rc = 0;
2235                 } else {
2236                         rc = osc_brw_redo_request(req, aa);
2237                         if (rc == 0)
2238                                 RETURN(0);
2239                 }
2240         }
2241
2242         if (aa->aa_ocapa) {
2243                 capa_put(aa->aa_ocapa);
2244                 aa->aa_ocapa = NULL;
2245         }
2246
2247         cli = aa->aa_cli;
2248
2249         client_obd_list_lock(&cli->cl_loi_list_lock);
2250
2251         /* We need to decrement before osc_ap_completion->osc_wake_cache_waiters
2252          * is called so we know whether to go to sync BRWs or wait for more
2253          * RPCs to complete */
2254         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE)
2255                 cli->cl_w_in_flight--;
2256         else
2257                 cli->cl_r_in_flight--;
2258
2259         async = cfs_list_empty(&aa->aa_oaps);
2260         if (!async) { /* from osc_send_oap_rpc() */
2261                 struct osc_async_page *oap, *tmp;
2262                 /* the caller may re-use the oap after the completion call so
2263                  * we need to clean it up a little */
2264                 cfs_list_for_each_entry_safe(oap, tmp, &aa->aa_oaps,
2265                                              oap_rpc_item) {
2266                         cfs_list_del_init(&oap->oap_rpc_item);
2267                         osc_ap_completion(env, cli, aa->aa_oa, oap, 1, rc);
2268                 }
2269                 OBDO_FREE(aa->aa_oa);
2270         } else { /* from async_internal() */
2271                 obd_count i;
2272                 for (i = 0; i < aa->aa_page_count; i++)
2273                         osc_release_write_grant(aa->aa_cli, aa->aa_ppga[i], 1);
2274         }
2275         osc_wake_cache_waiters(cli);
2276         osc_check_rpcs(env, cli);
2277         client_obd_list_unlock(&cli->cl_loi_list_lock);
2278         if (!async)
2279                 cl_req_completion(env, aa->aa_clerq, rc);
2280         osc_release_ppga(aa->aa_ppga, aa->aa_page_count);
2281
2282         RETURN(rc);
2283 }
2284
2285 static struct ptlrpc_request *osc_build_req(const struct lu_env *env,
2286                                             struct client_obd *cli,
2287                                             cfs_list_t *rpc_list,
2288                                             int page_count, int cmd)
2289 {
2290         struct ptlrpc_request *req;
2291         struct brw_page **pga = NULL;
2292         struct osc_brw_async_args *aa;
2293         struct obdo *oa = NULL;
2294         const struct obd_async_page_ops *ops = NULL;
2295         void *caller_data = NULL;
2296         struct osc_async_page *oap;
2297         struct osc_async_page *tmp;
2298         struct ost_body *body;
2299         struct cl_req *clerq = NULL;
2300         enum cl_req_type crt = (cmd & OBD_BRW_WRITE) ? CRT_WRITE : CRT_READ;
2301         struct ldlm_lock *lock = NULL;
2302         struct cl_req_attr crattr;
2303         int i, rc, mpflag = 0;
2304
2305         ENTRY;
2306         LASSERT(!cfs_list_empty(rpc_list));
2307
2308         if (cmd & OBD_BRW_MEMALLOC)
2309                 mpflag = cfs_memory_pressure_get_and_set();
2310
2311         memset(&crattr, 0, sizeof crattr);
2312         OBD_ALLOC(pga, sizeof(*pga) * page_count);
2313         if (pga == NULL)
2314                 GOTO(out, req = ERR_PTR(-ENOMEM));
2315
2316         OBDO_ALLOC(oa);
2317         if (oa == NULL)
2318                 GOTO(out, req = ERR_PTR(-ENOMEM));
2319
2320         i = 0;
2321         cfs_list_for_each_entry(oap, rpc_list, oap_rpc_item) {
2322                 struct cl_page *page = osc_oap2cl_page(oap);
2323                 if (ops == NULL) {
2324                         ops = oap->oap_caller_ops;
2325                         caller_data = oap->oap_caller_data;
2326
2327                         clerq = cl_req_alloc(env, page, crt,
2328                                              1 /* only 1-object rpcs for
2329                                                 * now */);
2330                         if (IS_ERR(clerq))
2331                                 GOTO(out, req = (void *)clerq);
2332                         lock = oap->oap_ldlm_lock;
2333                 }
2334                 pga[i] = &oap->oap_brw_page;
2335                 pga[i]->off = oap->oap_obj_off + oap->oap_page_off;
2336                 CDEBUG(0, "put page %p index %lu oap %p flg %x to pga\n",
2337                        pga[i]->pg, cfs_page_index(oap->oap_page), oap, pga[i]->flag);
2338                 i++;
2339                 cl_req_page_add(env, clerq, page);
2340         }
2341
2342         /* always get the data for the obdo for the rpc */
2343         LASSERT(ops != NULL);
2344         crattr.cra_oa = oa;
2345         crattr.cra_capa = NULL;
2346         cl_req_attr_set(env, clerq, &crattr, ~0ULL);
2347         if (lock) {
2348                 oa->o_handle = lock->l_remote_handle;
2349                 oa->o_valid |= OBD_MD_FLHANDLE;
2350         }
2351
2352         rc = cl_req_prep(env, clerq);
2353         if (rc != 0) {
2354                 CERROR("cl_req_prep failed: %d\n", rc);
2355                 GOTO(out, req = ERR_PTR(rc));
2356         }
2357
2358         sort_brw_pages(pga, page_count);
2359         rc = osc_brw_prep_request(cmd, cli, oa, NULL, page_count,
2360                                   pga, &req, crattr.cra_capa, 1, 0);
2361         if (rc != 0) {
2362                 CERROR("prep_req failed: %d\n", rc);
2363                 GOTO(out, req = ERR_PTR(rc));
2364         }
2365
2366         if (cmd & OBD_BRW_MEMALLOC)
2367                 req->rq_memalloc = 1;
2368
2369         /* Need to update the timestamps after the request is built in case
2370          * we race with setattr (locally or in queue at OST).  If OST gets
2371          * later setattr before earlier BRW (as determined by the request xid),
2372          * the OST will not use BRW timestamps.  Sadly, there is no obvious
2373          * way to do this in a single call.  bug 10150 */
2374         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
2375         cl_req_attr_set(env, clerq, &crattr,
2376                         OBD_MD_FLMTIME|OBD_MD_FLCTIME|OBD_MD_FLATIME);
2377
2378         CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
2379         aa = ptlrpc_req_async_args(req);
2380         CFS_INIT_LIST_HEAD(&aa->aa_oaps);
2381         cfs_list_splice(rpc_list, &aa->aa_oaps);
2382         CFS_INIT_LIST_HEAD(rpc_list);
2383         aa->aa_clerq = clerq;
2384 out:
2385         if (cmd & OBD_BRW_MEMALLOC)
2386                 cfs_memory_pressure_restore(mpflag);
2387
2388         capa_put(crattr.cra_capa);
2389         if (IS_ERR(req)) {
2390                 if (oa)
2391                         OBDO_FREE(oa);
2392                 if (pga)
2393                         OBD_FREE(pga, sizeof(*pga) * page_count);
2394                 /* this should happen rarely and is pretty bad, it makes the
2395                  * pending list not follow the dirty order */
2396                 client_obd_list_lock(&cli->cl_loi_list_lock);
2397                 cfs_list_for_each_entry_safe(oap, tmp, rpc_list, oap_rpc_item) {
2398                         cfs_list_del_init(&oap->oap_rpc_item);
2399
2400                         /* queued sync pages can be torn down while the pages
2401                          * were between the pending list and the rpc */
2402                         if (oap->oap_interrupted) {
2403                                 CDEBUG(D_INODE, "oap %p interrupted\n", oap);
2404                                 osc_ap_completion(env, cli, NULL, oap, 0,
2405                                                   oap->oap_count);
2406                                 continue;
2407                         }
2408                         osc_ap_completion(env, cli, NULL, oap, 0, PTR_ERR(req));
2409                 }
2410                 if (clerq && !IS_ERR(clerq))
2411                         cl_req_completion(env, clerq, PTR_ERR(req));
2412         }
2413         RETURN(req);
2414 }
2415
2416 /**
2417  * prepare pages for ASYNC io and put pages in send queue.
2418  *
2419  * \param cmd OBD_BRW_* macroses
2420  * \param lop pending pages
2421  *
2422  * \return zero if no page added to send queue.
2423  * \return 1 if pages successfully added to send queue.
2424  * \return negative on errors.
2425  */
2426 static int
2427 osc_send_oap_rpc(const struct lu_env *env, struct client_obd *cli,
2428                  struct lov_oinfo *loi,
2429                  int cmd, struct loi_oap_pages *lop)
2430 {
2431         struct ptlrpc_request *req;
2432         obd_count page_count = 0;
2433         struct osc_async_page *oap = NULL, *tmp;
2434         struct osc_brw_async_args *aa;
2435         const struct obd_async_page_ops *ops;
2436         CFS_LIST_HEAD(rpc_list);
2437         int srvlock = 0, mem_tight = 0;
2438         struct cl_object *clob = NULL;
2439         obd_off starting_offset = OBD_OBJECT_EOF;
2440         unsigned int ending_offset;
2441         int starting_page_off = 0;
2442         ENTRY;
2443
2444         /* ASYNC_HP pages first. At present, when the lock the pages is
2445          * to be canceled, the pages covered by the lock will be sent out
2446          * with ASYNC_HP. We have to send out them as soon as possible. */
2447         cfs_list_for_each_entry_safe(oap, tmp, &lop->lop_urgent, oap_urgent_item) {
2448                 if (oap->oap_async_flags & ASYNC_HP)
2449                         cfs_list_move(&oap->oap_pending_item, &lop->lop_pending);
2450                 if (++page_count >= cli->cl_max_pages_per_rpc)
2451                         break;
2452         }
2453         page_count = 0;
2454
2455         /* first we find the pages we're allowed to work with */
2456         cfs_list_for_each_entry_safe(oap, tmp, &lop->lop_pending,
2457                                      oap_pending_item) {
2458                 ops = oap->oap_caller_ops;
2459
2460                 LASSERTF(oap->oap_magic == OAP_MAGIC, "Bad oap magic: oap %p, "
2461                          "magic 0x%x\n", oap, oap->oap_magic);
2462
2463                 if (clob == NULL) {
2464                         /* pin object in memory, so that completion call-backs
2465                          * can be safely called under client_obd_list lock. */
2466                         clob = osc_oap2cl_page(oap)->cp_obj;
2467                         cl_object_get(clob);
2468                 }
2469
2470                 if (page_count != 0 &&
2471                     srvlock != !!(oap->oap_brw_flags & OBD_BRW_SRVLOCK)) {
2472                         CDEBUG(D_PAGE, "SRVLOCK flag mismatch,"
2473                                " oap %p, page %p, srvlock %u\n",
2474                                oap, oap->oap_brw_page.pg, (unsigned)!srvlock);
2475                         break;
2476                 }
2477
2478                 /* If there is a gap at the start of this page, it can't merge
2479                  * with any previous page, so we'll hand the network a
2480                  * "fragmented" page array that it can't transfer in 1 RDMA */
2481                 if (oap->oap_obj_off < starting_offset) {
2482                         if (starting_page_off != 0)
2483                                 break;
2484
2485                         starting_page_off = oap->oap_page_off;
2486                         starting_offset = oap->oap_obj_off + starting_page_off;
2487                 } else if (oap->oap_page_off != 0)
2488                         break;
2489
2490                 /* in llite being 'ready' equates to the page being locked
2491                  * until completion unlocks it.  commit_write submits a page
2492                  * as not ready because its unlock will happen unconditionally
2493                  * as the call returns.  if we race with commit_write giving
2494                  * us that page we don't want to create a hole in the page
2495                  * stream, so we stop and leave the rpc to be fired by
2496                  * another dirtier or kupdated interval (the not ready page
2497                  * will still be on the dirty list).  we could call in
2498                  * at the end of ll_file_write to process the queue again. */
2499                 if (!(oap->oap_async_flags & ASYNC_READY)) {
2500                         int rc = ops->ap_make_ready(env, oap->oap_caller_data,
2501                                                     cmd);
2502                         if (rc < 0)
2503                                 CDEBUG(D_INODE, "oap %p page %p returned %d "
2504                                                 "instead of ready\n", oap,
2505                                                 oap->oap_page, rc);
2506                         switch (rc) {
2507                         case -EAGAIN:
2508                                 /* llite is telling us that the page is still
2509                                  * in commit_write and that we should try
2510                                  * and put it in an rpc again later.  we
2511                                  * break out of the loop so we don't create
2512                                  * a hole in the sequence of pages in the rpc
2513                                  * stream.*/
2514                                 oap = NULL;
2515                                 break;
2516                         case -EINTR:
2517                                 /* the io isn't needed.. tell the checks
2518                                  * below to complete the rpc with EINTR */
2519                                 cfs_spin_lock(&oap->oap_lock);
2520                                 oap->oap_async_flags |= ASYNC_COUNT_STABLE;
2521                                 cfs_spin_unlock(&oap->oap_lock);
2522                                 oap->oap_count = -EINTR;
2523                                 break;
2524                         case 0:
2525                                 cfs_spin_lock(&oap->oap_lock);
2526                                 oap->oap_async_flags |= ASYNC_READY;
2527                                 cfs_spin_unlock(&oap->oap_lock);
2528                                 break;
2529                         default:
2530                                 LASSERTF(0, "oap %p page %p returned %d "
2531                                             "from make_ready\n", oap,
2532                                             oap->oap_page, rc);
2533                                 break;
2534                         }
2535                 }
2536                 if (oap == NULL)
2537                         break;
2538                 /*
2539                  * Page submitted for IO has to be locked. Either by
2540                  * ->ap_make_ready() or by higher layers.
2541                  */
2542 #if defined(__KERNEL__) && defined(__linux__)
2543                 {
2544                         struct cl_page *page;
2545
2546                         page = osc_oap2cl_page(oap);
2547
2548                         if (page->cp_type == CPT_CACHEABLE &&
2549                             !(PageLocked(oap->oap_page) &&
2550                               (CheckWriteback(oap->oap_page, cmd)))) {
2551                                 CDEBUG(D_PAGE, "page %p lost wb %lx/%x\n",
2552                                        oap->oap_page,
2553                                        (long)oap->oap_page->flags,
2554                                        oap->oap_async_flags);
2555                                 LBUG();
2556                         }
2557                 }
2558 #endif
2559
2560                 /* take the page out of our book-keeping */
2561                 cfs_list_del_init(&oap->oap_pending_item);
2562                 lop_update_pending(cli, lop, cmd, -1);
2563                 cfs_list_del_init(&oap->oap_urgent_item);
2564
2565                 /* ask the caller for the size of the io as the rpc leaves. */
2566                 if (!(oap->oap_async_flags & ASYNC_COUNT_STABLE)) {
2567                         oap->oap_count =
2568                                 ops->ap_refresh_count(env, oap->oap_caller_data,
2569                                                       cmd);
2570                         LASSERT(oap->oap_page_off + oap->oap_count <= CFS_PAGE_SIZE);
2571                 }
2572                 if (oap->oap_count <= 0) {
2573                         CDEBUG(D_CACHE, "oap %p count %d, completing\n", oap,
2574                                oap->oap_count);
2575                         osc_ap_completion(env, cli, NULL,
2576                                           oap, 0, oap->oap_count);
2577                         continue;
2578                 }
2579
2580                 /* now put the page back in our accounting */
2581                 cfs_list_add_tail(&oap->oap_rpc_item, &rpc_list);
2582                 if (page_count++ == 0)
2583                         srvlock = !!(oap->oap_brw_flags & OBD_BRW_SRVLOCK);
2584
2585                 if (oap->oap_brw_flags & OBD_BRW_MEMALLOC)
2586                         mem_tight = 1;
2587
2588                 /* End on a PTLRPC_MAX_BRW_SIZE boundary.  We want full-sized
2589                  * RPCs aligned on PTLRPC_MAX_BRW_SIZE boundaries to help reads
2590                  * have the same alignment as the initial writes that allocated
2591                  * extents on the server. */
2592                 ending_offset = oap->oap_obj_off + oap->oap_page_off +
2593                                 oap->oap_count;
2594                 if (!(ending_offset & (PTLRPC_MAX_BRW_SIZE - 1)))
2595                         break;
2596
2597                 if (page_count >= cli->cl_max_pages_per_rpc)
2598                         break;
2599
2600                 /* If there is a gap at the end of this page, it can't merge
2601                  * with any subsequent pages, so we'll hand the network a
2602                  * "fragmented" page array that it can't transfer in 1 RDMA */
2603                 if (oap->oap_page_off + oap->oap_count < CFS_PAGE_SIZE)
2604                         break;
2605         }
2606
2607         osc_wake_cache_waiters(cli);
2608
2609         loi_list_maint(cli, loi);
2610
2611         client_obd_list_unlock(&cli->cl_loi_list_lock);
2612
2613         if (clob != NULL)
2614                 cl_object_put(env, clob);
2615
2616         if (page_count == 0) {
2617                 client_obd_list_lock(&cli->cl_loi_list_lock);
2618                 RETURN(0);
2619         }
2620
2621         req = osc_build_req(env, cli, &rpc_list, page_count,
2622                             mem_tight ? (cmd | OBD_BRW_MEMALLOC) : cmd);
2623         if (IS_ERR(req)) {
2624                 LASSERT(cfs_list_empty(&rpc_list));
2625                 loi_list_maint(cli, loi);
2626                 RETURN(PTR_ERR(req));
2627         }
2628
2629         aa = ptlrpc_req_async_args(req);
2630
2631         starting_offset &= PTLRPC_MAX_BRW_SIZE - 1;
2632         if (cmd == OBD_BRW_READ) {
2633                 lprocfs_oh_tally_log2(&cli->cl_read_page_hist, page_count);
2634                 lprocfs_oh_tally(&cli->cl_read_rpc_hist, cli->cl_r_in_flight);
2635                 lprocfs_oh_tally_log2(&cli->cl_read_offset_hist,
2636                                       (starting_offset >> CFS_PAGE_SHIFT) + 1);
2637         } else {
2638                 lprocfs_oh_tally_log2(&cli->cl_write_page_hist, page_count);
2639                 lprocfs_oh_tally(&cli->cl_write_rpc_hist,
2640                                  cli->cl_w_in_flight);
2641                 lprocfs_oh_tally_log2(&cli->cl_write_offset_hist,
2642                                       (starting_offset >> CFS_PAGE_SHIFT) + 1);
2643         }
2644         ptlrpc_lprocfs_brw(req, aa->aa_requested_nob);
2645
2646         client_obd_list_lock(&cli->cl_loi_list_lock);
2647
2648         if (cmd == OBD_BRW_READ)
2649                 cli->cl_r_in_flight++;
2650         else
2651                 cli->cl_w_in_flight++;
2652
2653         /* queued sync pages can be torn down while the pages
2654          * were between the pending list and the rpc */
2655         tmp = NULL;
2656         cfs_list_for_each_entry(oap, &aa->aa_oaps, oap_rpc_item) {
2657                 /* only one oap gets a request reference */
2658                 if (tmp == NULL)
2659                         tmp = oap;
2660                 if (oap->oap_interrupted && !req->rq_intr) {
2661                         CDEBUG(D_INODE, "oap %p in req %p interrupted\n",
2662                                oap, req);
2663                         ptlrpc_mark_interrupted(req);
2664                 }
2665         }
2666         if (tmp != NULL)
2667                 tmp->oap_request = ptlrpc_request_addref(req);
2668
2669         DEBUG_REQ(D_INODE, req, "%d pages, aa %p. now %dr/%dw in flight",
2670                   page_count, aa, cli->cl_r_in_flight, cli->cl_w_in_flight);
2671
2672         req->rq_interpret_reply = brw_interpret;
2673         ptlrpcd_add_req(req, PSCOPE_BRW);
2674         RETURN(1);
2675 }
2676
2677 #define LOI_DEBUG(LOI, STR, args...)                                     \
2678         CDEBUG(D_INODE, "loi ready %d wr %d:%d rd %d:%d " STR,           \
2679                !cfs_list_empty(&(LOI)->loi_ready_item) ||                \
2680                !cfs_list_empty(&(LOI)->loi_hp_ready_item),               \
2681                (LOI)->loi_write_lop.lop_num_pending,                     \
2682                !cfs_list_empty(&(LOI)->loi_write_lop.lop_urgent),        \
2683                (LOI)->loi_read_lop.lop_num_pending,                      \
2684                !cfs_list_empty(&(LOI)->loi_read_lop.lop_urgent),         \
2685                args)                                                     \
2686
2687 /* This is called by osc_check_rpcs() to find which objects have pages that
2688  * we could be sending.  These lists are maintained by lop_makes_rpc(). */
2689 struct lov_oinfo *osc_next_loi(struct client_obd *cli)
2690 {
2691         ENTRY;
2692
2693         /* First return objects that have blocked locks so that they
2694          * will be flushed quickly and other clients can get the lock,
2695          * then objects which have pages ready to be stuffed into RPCs */
2696         if (!cfs_list_empty(&cli->cl_loi_hp_ready_list))
2697                 RETURN(cfs_list_entry(cli->cl_loi_hp_ready_list.next,
2698                                       struct lov_oinfo, loi_hp_ready_item));
2699         if (!cfs_list_empty(&cli->cl_loi_ready_list))
2700                 RETURN(cfs_list_entry(cli->cl_loi_ready_list.next,
2701                                       struct lov_oinfo, loi_ready_item));
2702
2703         /* then if we have cache waiters, return all objects with queued
2704          * writes.  This is especially important when many small files
2705          * have filled up the cache and not been fired into rpcs because
2706          * they don't pass the nr_pending/object threshhold */
2707         if (!cfs_list_empty(&cli->cl_cache_waiters) &&
2708             !cfs_list_empty(&cli->cl_loi_write_list))
2709                 RETURN(cfs_list_entry(cli->cl_loi_write_list.next,
2710                                       struct lov_oinfo, loi_write_item));
2711
2712         /* then return all queued objects when we have an invalid import
2713          * so that they get flushed */
2714         if (cli->cl_import == NULL || cli->cl_import->imp_invalid) {
2715                 if (!cfs_list_empty(&cli->cl_loi_write_list))
2716                         RETURN(cfs_list_entry(cli->cl_loi_write_list.next,
2717                                               struct lov_oinfo,
2718                                               loi_write_item));
2719                 if (!cfs_list_empty(&cli->cl_loi_read_list))
2720                         RETURN(cfs_list_entry(cli->cl_loi_read_list.next,
2721                                               struct lov_oinfo, loi_read_item));
2722         }
2723         RETURN(NULL);
2724 }
2725
2726 static int osc_max_rpc_in_flight(struct client_obd *cli, struct lov_oinfo *loi)
2727 {
2728         struct osc_async_page *oap;
2729         int hprpc = 0;
2730
2731         if (!cfs_list_empty(&loi->loi_write_lop.lop_urgent)) {
2732                 oap = cfs_list_entry(loi->loi_write_lop.lop_urgent.next,
2733                                      struct osc_async_page, oap_urgent_item);
2734                 hprpc = !!(oap->oap_async_flags & ASYNC_HP);
2735         }
2736
2737         if (!hprpc && !cfs_list_empty(&loi->loi_read_lop.lop_urgent)) {
2738                 oap = cfs_list_entry(loi->loi_read_lop.lop_urgent.next,
2739                                      struct osc_async_page, oap_urgent_item);
2740                 hprpc = !!(oap->oap_async_flags & ASYNC_HP);
2741         }
2742
2743         return rpcs_in_flight(cli) >= cli->cl_max_rpcs_in_flight + hprpc;
2744 }
2745
2746 /* called with the loi list lock held */
2747 void osc_check_rpcs(const struct lu_env *env, struct client_obd *cli)
2748 {
2749         struct lov_oinfo *loi;
2750         int rc = 0, race_counter = 0;
2751         ENTRY;
2752
2753         while ((loi = osc_next_loi(cli)) != NULL) {
2754                 LOI_DEBUG(loi, "%lu in flight\n", rpcs_in_flight(cli));
2755
2756                 if (osc_max_rpc_in_flight(cli, loi))
2757                         break;
2758
2759                 /* attempt some read/write balancing by alternating between
2760                  * reads and writes in an object.  The makes_rpc checks here
2761                  * would be redundant if we were getting read/write work items
2762                  * instead of objects.  we don't want send_oap_rpc to drain a
2763                  * partial read pending queue when we're given this object to
2764                  * do io on writes while there are cache waiters */
2765                 if (lop_makes_rpc(cli, &loi->loi_write_lop, OBD_BRW_WRITE)) {
2766                         rc = osc_send_oap_rpc(env, cli, loi, OBD_BRW_WRITE,
2767                                               &loi->loi_write_lop);
2768                         if (rc < 0) {
2769                                 CERROR("Write request failed with %d\n", rc);
2770
2771                                 /* osc_send_oap_rpc failed, mostly because of
2772                                  * memory pressure.
2773                                  *
2774                                  * It can't break here, because if:
2775                                  *  - a page was submitted by osc_io_submit, so
2776                                  *    page locked;
2777                                  *  - no request in flight
2778                                  *  - no subsequent request
2779                                  * The system will be in live-lock state,
2780                                  * because there is no chance to call
2781                                  * osc_io_unplug() and osc_check_rpcs() any
2782                                  * more. pdflush can't help in this case,
2783                                  * because it might be blocked at grabbing
2784                                  * the page lock as we mentioned.
2785                                  *
2786                                  * Anyway, continue to drain pages. */
2787                                 /* break; */
2788                         }
2789
2790                         if (rc > 0)
2791                                 race_counter = 0;
2792                         else if (rc == 0)
2793                                 race_counter++;
2794                 }
2795                 if (lop_makes_rpc(cli, &loi->loi_read_lop, OBD_BRW_READ)) {
2796                         rc = osc_send_oap_rpc(env, cli, loi, OBD_BRW_READ,
2797                                               &loi->loi_read_lop);
2798                         if (rc < 0)
2799                                 CERROR("Read request failed with %d\n", rc);
2800
2801                         if (rc > 0)
2802                                 race_counter = 0;
2803                         else if (rc == 0)
2804                                 race_counter++;
2805                 }
2806
2807                 /* attempt some inter-object balancing by issuing rpcs
2808                  * for each object in turn */
2809                 if (!cfs_list_empty(&loi->loi_hp_ready_item))
2810                         cfs_list_del_init(&loi->loi_hp_ready_item);
2811                 if (!cfs_list_empty(&loi->loi_ready_item))
2812                         cfs_list_del_init(&loi->loi_ready_item);
2813                 if (!cfs_list_empty(&loi->loi_write_item))
2814                         cfs_list_del_init(&loi->loi_write_item);
2815                 if (!cfs_list_empty(&loi->loi_read_item))
2816                         cfs_list_del_init(&loi->loi_read_item);
2817
2818                 loi_list_maint(cli, loi);
2819
2820                 /* send_oap_rpc fails with 0 when make_ready tells it to
2821                  * back off.  llite's make_ready does this when it tries
2822                  * to lock a page queued for write that is already locked.
2823                  * we want to try sending rpcs from many objects, but we
2824                  * don't want to spin failing with 0.  */
2825                 if (race_counter == 10)
2826                         break;
2827         }
2828         EXIT;
2829 }
2830
2831 /* we're trying to queue a page in the osc so we're subject to the
2832  * 'cl_dirty_max' limit on the number of pages that can be queued in the osc.
2833  * If the osc's queued pages are already at that limit, then we want to sleep
2834  * until there is space in the osc's queue for us.  We also may be waiting for
2835  * write credits from the OST if there are RPCs in flight that may return some
2836  * before we fall back to sync writes.
2837  *
2838  * We need this know our allocation was granted in the presence of signals */
2839 static int ocw_granted(struct client_obd *cli, struct osc_cache_waiter *ocw)
2840 {
2841         int rc;
2842         ENTRY;
2843         client_obd_list_lock(&cli->cl_loi_list_lock);
2844         rc = cfs_list_empty(&ocw->ocw_entry) || rpcs_in_flight(cli) == 0;
2845         client_obd_list_unlock(&cli->cl_loi_list_lock);
2846         RETURN(rc);
2847 };
2848
2849 /**
2850  * Non-blocking version of osc_enter_cache() that consumes grant only when it
2851  * is available.
2852  */
2853 int osc_enter_cache_try(const struct lu_env *env,
2854                         struct client_obd *cli, struct lov_oinfo *loi,
2855                         struct osc_async_page *oap, int transient)
2856 {
2857         int has_grant;
2858
2859         has_grant = cli->cl_avail_grant >= CFS_PAGE_SIZE;
2860         if (has_grant) {
2861                 osc_consume_write_grant(cli, &oap->oap_brw_page);
2862                 if (transient) {
2863                         cli->cl_dirty_transit += CFS_PAGE_SIZE;
2864                         cfs_atomic_inc(&obd_dirty_transit_pages);
2865                         oap->oap_brw_flags |= OBD_BRW_NOCACHE;
2866                 }
2867         }
2868         return has_grant;
2869 }
2870
2871 /* Caller must hold loi_list_lock - we drop/regain it if we need to wait for
2872  * grant or cache space. */
2873 static int osc_enter_cache(const struct lu_env *env,
2874                            struct client_obd *cli, struct lov_oinfo *loi,
2875                            struct osc_async_page *oap)
2876 {
2877         struct osc_cache_waiter ocw;
2878         struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
2879
2880         ENTRY;
2881
2882         CDEBUG(D_CACHE, "dirty: %ld/%d dirty_max: %ld/%d dropped: %lu "
2883                "grant: %lu\n", cli->cl_dirty, cfs_atomic_read(&obd_dirty_pages),
2884                cli->cl_dirty_max, obd_max_dirty_pages,
2885                cli->cl_lost_grant, cli->cl_avail_grant);
2886
2887         /* force the caller to try sync io.  this can jump the list
2888          * of queued writes and create a discontiguous rpc stream */
2889         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_NO_GRANT) ||
2890             cli->cl_dirty_max < CFS_PAGE_SIZE     ||
2891             cli->cl_ar.ar_force_sync || loi->loi_ar.ar_force_sync)
2892                 RETURN(-EDQUOT);
2893
2894         /* Hopefully normal case - cache space and write credits available */
2895         if (cli->cl_dirty + CFS_PAGE_SIZE <= cli->cl_dirty_max &&
2896             cfs_atomic_read(&obd_dirty_pages) + 1 <= obd_max_dirty_pages &&
2897             osc_enter_cache_try(env, cli, loi, oap, 0))
2898                 RETURN(0);
2899
2900         /* It is safe to block as a cache waiter as long as there is grant
2901          * space available or the hope of additional grant being returned
2902          * when an in flight write completes.  Using the write back cache
2903          * if possible is preferable to sending the data synchronously
2904          * because write pages can then be merged in to large requests.
2905          * The addition of this cache waiter will causing pending write
2906          * pages to be sent immediately. */
2907         if (cli->cl_w_in_flight || cli->cl_avail_grant >= CFS_PAGE_SIZE) {
2908                 cfs_list_add_tail(&ocw.ocw_entry, &cli->cl_cache_waiters);
2909                 cfs_waitq_init(&ocw.ocw_waitq);
2910                 ocw.ocw_oap = oap;
2911                 ocw.ocw_rc = 0;
2912
2913                 loi_list_maint(cli, loi);
2914                 osc_check_rpcs(env, cli);
2915                 client_obd_list_unlock(&cli->cl_loi_list_lock);
2916
2917                 CDEBUG(D_CACHE, "sleeping for cache space\n");
2918                 l_wait_event(ocw.ocw_waitq, ocw_granted(cli, &ocw), &lwi);
2919
2920                 client_obd_list_lock(&cli->cl_loi_list_lock);
2921                 if (!cfs_list_empty(&ocw.ocw_entry)) {
2922                         cfs_list_del(&ocw.ocw_entry);
2923                         RETURN(-EINTR);
2924                 }
2925                 RETURN(ocw.ocw_rc);
2926         }
2927
2928         RETURN(-EDQUOT);
2929 }
2930
2931
2932 int osc_prep_async_page(struct obd_export *exp, struct lov_stripe_md *lsm,
2933                         struct lov_oinfo *loi, cfs_page_t *page,
2934                         obd_off offset, const struct obd_async_page_ops *ops,
2935                         void *data, void **res, int nocache,
2936                         struct lustre_handle *lockh)
2937 {
2938         struct osc_async_page *oap;
2939
2940         ENTRY;
2941
2942         if (!page)
2943                 return cfs_size_round(sizeof(*oap));
2944
2945         oap = *res;
2946         oap->oap_magic = OAP_MAGIC;
2947         oap->oap_cli = &exp->exp_obd->u.cli;
2948         oap->oap_loi = loi;
2949
2950         oap->oap_caller_ops = ops;
2951         oap->oap_caller_data = data;
2952
2953         oap->oap_page = page;
2954         oap->oap_obj_off = offset;
2955         if (!client_is_remote(exp) &&
2956             cfs_capable(CFS_CAP_SYS_RESOURCE))
2957                 oap->oap_brw_flags = OBD_BRW_NOQUOTA;
2958
2959         LASSERT(!(offset & ~CFS_PAGE_MASK));
2960
2961         CFS_INIT_LIST_HEAD(&oap->oap_pending_item);
2962         CFS_INIT_LIST_HEAD(&oap->oap_urgent_item);
2963         CFS_INIT_LIST_HEAD(&oap->oap_rpc_item);
2964         CFS_INIT_LIST_HEAD(&oap->oap_page_list);
2965
2966         cfs_spin_lock_init(&oap->oap_lock);
2967         CDEBUG(D_CACHE, "oap %p page %p obj off "LPU64"\n", oap, page, offset);
2968         RETURN(0);
2969 }
2970
2971 int osc_queue_async_io(const struct lu_env *env, struct obd_export *exp,
2972                        struct lov_stripe_md *lsm, struct lov_oinfo *loi,
2973                        struct osc_async_page *oap, int cmd, int off,
2974                        int count, obd_flag brw_flags, enum async_flags async_flags)
2975 {
2976         struct client_obd *cli = &exp->exp_obd->u.cli;
2977         int rc = 0;
2978         ENTRY;
2979
2980         if (oap->oap_magic != OAP_MAGIC)
2981                 RETURN(-EINVAL);
2982
2983         if (cli->cl_import == NULL || cli->cl_import->imp_invalid)
2984                 RETURN(-EIO);
2985
2986         if (!cfs_list_empty(&oap->oap_pending_item) ||
2987             !cfs_list_empty(&oap->oap_urgent_item) ||
2988             !cfs_list_empty(&oap->oap_rpc_item))
2989                 RETURN(-EBUSY);
2990
2991         /* check if the file's owner/group is over quota */
2992         if ((cmd & OBD_BRW_WRITE) && !(cmd & OBD_BRW_NOQUOTA)) {
2993                 struct cl_object *obj;
2994                 struct cl_attr    attr; /* XXX put attr into thread info */
2995                 unsigned int qid[MAXQUOTAS];
2996
2997                 obj = cl_object_top(osc_oap2cl_page(oap)->cp_obj);
2998
2999                 cl_object_attr_lock(obj);
3000                 rc = cl_object_attr_get(env, obj, &attr);
3001                 cl_object_attr_unlock(obj);
3002
3003                 qid[USRQUOTA] = attr.cat_uid;
3004                 qid[GRPQUOTA] = attr.cat_gid;
3005                 if (rc == 0 &&
3006                     lquota_chkdq(quota_interface, cli, qid) == NO_QUOTA)
3007                         rc = -EDQUOT;
3008                 if (rc)
3009                         RETURN(rc);
3010         }
3011
3012         if (loi == NULL)
3013                 loi = lsm->lsm_oinfo[0];
3014
3015         client_obd_list_lock(&cli->cl_loi_list_lock);
3016
3017         LASSERT(off + count <= CFS_PAGE_SIZE);
3018         oap->oap_cmd = cmd;
3019         oap->oap_page_off = off;
3020         oap->oap_count = count;
3021         oap->oap_brw_flags = brw_flags;
3022         /* Give a hint to OST that requests are coming from kswapd - bug19529 */
3023         if (cfs_memory_pressure_get())
3024                 oap->oap_brw_flags |= OBD_BRW_MEMALLOC;
3025         cfs_spin_lock(&oap->oap_lock);
3026         oap->oap_async_flags = async_flags;
3027         cfs_spin_unlock(&oap->oap_lock);
3028
3029         if (cmd & OBD_BRW_WRITE) {
3030                 rc = osc_enter_cache(env, cli, loi, oap);
3031                 if (rc) {
3032                         client_obd_list_unlock(&cli->cl_loi_list_lock);
3033                         RETURN(rc);
3034                 }
3035         }
3036
3037         osc_oap_to_pending(oap);
3038         loi_list_maint(cli, loi);
3039
3040         LOI_DEBUG(loi, "oap %p page %p added for cmd %d\n", oap, oap->oap_page,
3041                   cmd);
3042
3043         osc_check_rpcs(env, cli);
3044         client_obd_list_unlock(&cli->cl_loi_list_lock);
3045
3046         RETURN(0);
3047 }
3048
3049 /* aka (~was & now & flag), but this is more clear :) */
3050 #define SETTING(was, now, flag) (!(was & flag) && (now & flag))
3051
3052 int osc_set_async_flags_base(struct client_obd *cli,
3053                              struct lov_oinfo *loi, struct osc_async_page *oap,
3054                              obd_flag async_flags)
3055 {
3056         struct loi_oap_pages *lop;
3057         int flags = 0;
3058         ENTRY;
3059
3060         LASSERT(!cfs_list_empty(&oap->oap_pending_item));
3061
3062         if (oap->oap_cmd & OBD_BRW_WRITE) {
3063                 lop = &loi->loi_write_lop;
3064         } else {
3065                 lop = &loi->loi_read_lop;
3066         }
3067
3068         if ((oap->oap_async_flags & async_flags) == async_flags)
3069                 RETURN(0);
3070
3071         if (SETTING(oap->oap_async_flags, async_flags, ASYNC_READY))
3072                 flags |= ASYNC_READY;
3073
3074         if (SETTING(oap->oap_async_flags, async_flags, ASYNC_URGENT) &&
3075             cfs_list_empty(&oap->oap_rpc_item)) {
3076                 if (oap->oap_async_flags & ASYNC_HP)
3077                         cfs_list_add(&oap->oap_urgent_item, &lop->lop_urgent);
3078                 else
3079                         cfs_list_add_tail(&oap->oap_urgent_item,
3080                                           &lop->lop_urgent);
3081                 flags |= ASYNC_URGENT;
3082                 loi_list_maint(cli, loi);
3083         }
3084         cfs_spin_lock(&oap->oap_lock);
3085         oap->oap_async_flags |= flags;
3086         cfs_spin_unlock(&oap->oap_lock);
3087
3088         LOI_DEBUG(loi, "oap %p page %p has flags %x\n", oap, oap->oap_page,
3089                         oap->oap_async_flags);
3090         RETURN(0);
3091 }
3092
3093 int osc_teardown_async_page(struct obd_export *exp, struct lov_stripe_md *lsm,
3094                             struct lov_oinfo *loi, struct osc_async_page *oap)
3095 {
3096         struct client_obd *cli = &exp->exp_obd->u.cli;
3097         struct loi_oap_pages *lop;
3098         int rc = 0;
3099         ENTRY;
3100
3101         if (oap->oap_magic != OAP_MAGIC)
3102                 RETURN(-EINVAL);
3103
3104         if (loi == NULL)
3105                 loi = lsm->lsm_oinfo[0];
3106
3107         if (oap->oap_cmd & OBD_BRW_WRITE) {
3108                 lop = &loi->loi_write_lop;
3109         } else {
3110                 lop = &loi->loi_read_lop;
3111         }
3112
3113         client_obd_list_lock(&cli->cl_loi_list_lock);
3114
3115         if (!cfs_list_empty(&oap->oap_rpc_item))
3116                 GOTO(out, rc = -EBUSY);
3117
3118         osc_exit_cache(cli, oap, 0);
3119         osc_wake_cache_waiters(cli);
3120
3121         if (!cfs_list_empty(&oap->oap_urgent_item)) {
3122                 cfs_list_del_init(&oap->oap_urgent_item);
3123                 cfs_spin_lock(&oap->oap_lock);
3124                 oap->oap_async_flags &= ~(ASYNC_URGENT | ASYNC_HP);
3125                 cfs_spin_unlock(&oap->oap_lock);
3126         }
3127         if (!cfs_list_empty(&oap->oap_pending_item)) {
3128                 cfs_list_del_init(&oap->oap_pending_item);
3129                 lop_update_pending(cli, lop, oap->oap_cmd, -1);
3130         }
3131         loi_list_maint(cli, loi);
3132         LOI_DEBUG(loi, "oap %p page %p torn down\n", oap, oap->oap_page);
3133 out:
3134         client_obd_list_unlock(&cli->cl_loi_list_lock);
3135         RETURN(rc);
3136 }
3137
3138 static int osc_set_lock_data_with_check(struct ldlm_lock *lock,
3139                                         struct ldlm_enqueue_info *einfo)
3140 {
3141         void *data = einfo->ei_cbdata;
3142         int set = 0;
3143
3144         LASSERT(lock != NULL);
3145         LASSERT(lock->l_blocking_ast == einfo->ei_cb_bl);
3146         LASSERT(lock->l_resource->lr_type == einfo->ei_type);
3147         LASSERT(lock->l_completion_ast == einfo->ei_cb_cp);
3148         LASSERT(lock->l_glimpse_ast == einfo->ei_cb_gl);
3149
3150         lock_res_and_lock(lock);
3151         cfs_spin_lock(&osc_ast_guard);
3152
3153         if (lock->l_ast_data == NULL)
3154                 lock->l_ast_data = data;
3155         if (lock->l_ast_data == data)
3156                 set = 1;
3157
3158         cfs_spin_unlock(&osc_ast_guard);
3159         unlock_res_and_lock(lock);
3160
3161         return set;
3162 }
3163
3164 static int osc_set_data_with_check(struct lustre_handle *lockh,
3165                                    struct ldlm_enqueue_info *einfo)
3166 {
3167         struct ldlm_lock *lock = ldlm_handle2lock(lockh);
3168         int set = 0;
3169
3170         if (lock != NULL) {
3171                 set = osc_set_lock_data_with_check(lock, einfo);
3172                 LDLM_LOCK_PUT(lock);
3173         } else
3174                 CERROR("lockh %p, data %p - client evicted?\n",
3175                        lockh, einfo->ei_cbdata);
3176         return set;
3177 }
3178
3179 static int osc_change_cbdata(struct obd_export *exp, struct lov_stripe_md *lsm,
3180                              ldlm_iterator_t replace, void *data)
3181 {
3182         struct ldlm_res_id res_id;
3183         struct obd_device *obd = class_exp2obd(exp);
3184
3185         osc_build_res_name(lsm->lsm_object_id, lsm->lsm_object_seq, &res_id);
3186         ldlm_resource_iterate(obd->obd_namespace, &res_id, replace, data);
3187         return 0;
3188 }
3189
3190 /* find any ldlm lock of the inode in osc
3191  * return 0    not find
3192  *        1    find one
3193  *      < 0    error */
3194 static int osc_find_cbdata(struct obd_export *exp, struct lov_stripe_md *lsm,
3195                            ldlm_iterator_t replace, void *data)
3196 {
3197         struct ldlm_res_id res_id;
3198         struct obd_device *obd = class_exp2obd(exp);
3199         int rc = 0;
3200
3201         osc_build_res_name(lsm->lsm_object_id, lsm->lsm_object_seq, &res_id);
3202         rc = ldlm_resource_iterate(obd->obd_namespace, &res_id, replace, data);
3203         if (rc == LDLM_ITER_STOP)
3204                 return(1);
3205         if (rc == LDLM_ITER_CONTINUE)
3206                 return(0);
3207         return(rc);
3208 }
3209
3210 static int osc_enqueue_fini(struct ptlrpc_request *req, struct ost_lvb *lvb,
3211                             obd_enqueue_update_f upcall, void *cookie,
3212                             int *flags, int rc)
3213 {
3214         int intent = *flags & LDLM_FL_HAS_INTENT;
3215         ENTRY;
3216
3217         if (intent) {
3218                 /* The request was created before ldlm_cli_enqueue call. */
3219                 if (rc == ELDLM_LOCK_ABORTED) {
3220                         struct ldlm_reply *rep;
3221                         rep = req_capsule_server_get(&req->rq_pill,
3222                                                      &RMF_DLM_REP);
3223
3224                         LASSERT(rep != NULL);
3225                         if (rep->lock_policy_res1)
3226                                 rc = rep->lock_policy_res1;
3227                 }
3228         }
3229
3230         if ((intent && rc == ELDLM_LOCK_ABORTED) || !rc) {
3231                 *flags |= LDLM_FL_LVB_READY;
3232                 CDEBUG(D_INODE,"got kms "LPU64" blocks "LPU64" mtime "LPU64"\n",
3233                        lvb->lvb_size, lvb->lvb_blocks, lvb->lvb_mtime);
3234         }
3235
3236         /* Call the update callback. */
3237         rc = (*upcall)(cookie, rc);
3238         RETURN(rc);
3239 }
3240
3241 static int osc_enqueue_interpret(const struct lu_env *env,
3242                                  struct ptlrpc_request *req,
3243                                  struct osc_enqueue_args *aa, int rc)
3244 {
3245         struct ldlm_lock *lock;
3246         struct lustre_handle handle;
3247         __u32 mode;
3248
3249         /* Make a local copy of a lock handle and a mode, because aa->oa_*
3250          * might be freed anytime after lock upcall has been called. */
3251         lustre_handle_copy(&handle, aa->oa_lockh);
3252         mode = aa->oa_ei->ei_mode;
3253
3254         /* ldlm_cli_enqueue is holding a reference on the lock, so it must
3255          * be valid. */
3256         lock = ldlm_handle2lock(&handle);
3257
3258         /* Take an additional reference so that a blocking AST that
3259          * ldlm_cli_enqueue_fini() might post for a failed lock, is guaranteed
3260          * to arrive after an upcall has been executed by
3261          * osc_enqueue_fini(). */
3262         ldlm_lock_addref(&handle, mode);
3263
3264         /* Let CP AST to grant the lock first. */
3265         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_ENQ_RACE, 1);
3266
3267         /* Complete obtaining the lock procedure. */
3268         rc = ldlm_cli_enqueue_fini(aa->oa_exp, req, aa->oa_ei->ei_type, 1,
3269                                    mode, aa->oa_flags, aa->oa_lvb,
3270                                    sizeof(*aa->oa_lvb), &handle, rc);
3271         /* Complete osc stuff. */
3272         rc = osc_enqueue_fini(req, aa->oa_lvb,
3273                               aa->oa_upcall, aa->oa_cookie, aa->oa_flags, rc);
3274
3275         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_CANCEL_RACE, 10);
3276
3277         /* Release the lock for async request. */
3278         if (lustre_handle_is_used(&handle) && rc == ELDLM_OK)
3279                 /*
3280                  * Releases a reference taken by ldlm_cli_enqueue(), if it is
3281                  * not already released by
3282                  * ldlm_cli_enqueue_fini()->failed_lock_cleanup()
3283                  */
3284                 ldlm_lock_decref(&handle, mode);
3285
3286         LASSERTF(lock != NULL, "lockh %p, req %p, aa %p - client evicted?\n",
3287                  aa->oa_lockh, req, aa);
3288         ldlm_lock_decref(&handle, mode);
3289         LDLM_LOCK_PUT(lock);
3290         return rc;
3291 }
3292
3293 void osc_update_enqueue(struct lustre_handle *lov_lockhp,
3294                         struct lov_oinfo *loi, int flags,
3295                         struct ost_lvb *lvb, __u32 mode, int rc)
3296 {
3297         if (rc == ELDLM_OK) {
3298                 struct ldlm_lock *lock = ldlm_handle2lock(lov_lockhp);
3299                 __u64 tmp;
3300
3301                 LASSERT(lock != NULL);
3302                 loi->loi_lvb = *lvb;
3303                 tmp = loi->loi_lvb.lvb_size;
3304                 /* Extend KMS up to the end of this lock and no further
3305                  * A lock on [x,y] means a KMS of up to y + 1 bytes! */
3306                 if (tmp > lock->l_policy_data.l_extent.end)
3307                         tmp = lock->l_policy_data.l_extent.end + 1;
3308                 if (tmp >= loi->loi_kms) {
3309                         LDLM_DEBUG(lock, "lock acquired, setting rss="LPU64
3310                                    ", kms="LPU64, loi->loi_lvb.lvb_size, tmp);
3311                         loi_kms_set(loi, tmp);
3312                 } else {
3313                         LDLM_DEBUG(lock, "lock acquired, setting rss="
3314                                    LPU64"; leaving kms="LPU64", end="LPU64,
3315                                    loi->loi_lvb.lvb_size, loi->loi_kms,
3316                                    lock->l_policy_data.l_extent.end);
3317                 }
3318                 ldlm_lock_allow_match(lock);
3319                 LDLM_LOCK_PUT(lock);
3320         } else if (rc == ELDLM_LOCK_ABORTED && (flags & LDLM_FL_HAS_INTENT)) {
3321                 loi->loi_lvb = *lvb;
3322                 CDEBUG(D_INODE, "glimpsed, setting rss="LPU64"; leaving"
3323                        " kms="LPU64"\n", loi->loi_lvb.lvb_size, loi->loi_kms);
3324                 rc = ELDLM_OK;
3325         }
3326 }
3327 EXPORT_SYMBOL(osc_update_enqueue);
3328
3329 struct ptlrpc_request_set *PTLRPCD_SET = (void *)1;
3330
3331 /* When enqueuing asynchronously, locks are not ordered, we can obtain a lock
3332  * from the 2nd OSC before a lock from the 1st one. This does not deadlock with
3333  * other synchronous requests, however keeping some locks and trying to obtain
3334  * others may take a considerable amount of time in a case of ost failure; and
3335  * when other sync requests do not get released lock from a client, the client
3336  * is excluded from the cluster -- such scenarious make the life difficult, so
3337  * release locks just after they are obtained. */
3338 int osc_enqueue_base(struct obd_export *exp, struct ldlm_res_id *res_id,
3339                      int *flags, ldlm_policy_data_t *policy,
3340                      struct ost_lvb *lvb, int kms_valid,
3341                      obd_enqueue_update_f upcall, void *cookie,
3342                      struct ldlm_enqueue_info *einfo,
3343                      struct lustre_handle *lockh,
3344                      struct ptlrpc_request_set *rqset, int async)
3345 {
3346         struct obd_device *obd = exp->exp_obd;
3347         struct ptlrpc_request *req = NULL;
3348         int intent = *flags & LDLM_FL_HAS_INTENT;
3349         ldlm_mode_t mode;
3350         int rc;
3351         ENTRY;
3352
3353         /* Filesystem lock extents are extended to page boundaries so that
3354          * dealing with the page cache is a little smoother.  */
3355         policy->l_extent.start -= policy->l_extent.start & ~CFS_PAGE_MASK;
3356         policy->l_extent.end |= ~CFS_PAGE_MASK;
3357
3358         /*
3359          * kms is not valid when either object is completely fresh (so that no
3360          * locks are cached), or object was evicted. In the latter case cached
3361          * lock cannot be used, because it would prime inode state with
3362          * potentially stale LVB.
3363          */
3364         if (!kms_valid)
3365                 goto no_match;
3366
3367         /* Next, search for already existing extent locks that will cover us */
3368         /* If we're trying to read, we also search for an existing PW lock.  The
3369          * VFS and page cache already protect us locally, so lots of readers/
3370          * writers can share a single PW lock.
3371          *
3372          * There are problems with conversion deadlocks, so instead of
3373          * converting a read lock to a write lock, we'll just enqueue a new
3374          * one.
3375          *
3376          * At some point we should cancel the read lock instead of making them
3377          * send us a blocking callback, but there are problems with canceling
3378          * locks out from other users right now, too. */
3379         mode = einfo->ei_mode;
3380         if (einfo->ei_mode == LCK_PR)
3381                 mode |= LCK_PW;
3382         mode = ldlm_lock_match(obd->obd_namespace,
3383                                *flags | LDLM_FL_LVB_READY, res_id,
3384                                einfo->ei_type, policy, mode, lockh, 0);
3385         if (mode) {
3386                 struct ldlm_lock *matched = ldlm_handle2lock(lockh);
3387
3388                 if (osc_set_lock_data_with_check(matched, einfo)) {
3389                         /* addref the lock only if not async requests and PW
3390                          * lock is matched whereas we asked for PR. */
3391                         if (!rqset && einfo->ei_mode != mode)
3392                                 ldlm_lock_addref(lockh, LCK_PR);
3393                         if (intent) {
3394                                 /* I would like to be able to ASSERT here that
3395                                  * rss <= kms, but I can't, for reasons which
3396                                  * are explained in lov_enqueue() */
3397                         }
3398
3399                         /* We already have a lock, and it's referenced */
3400                         (*upcall)(cookie, ELDLM_OK);
3401
3402                         /* For async requests, decref the lock. */
3403                         if (einfo->ei_mode != mode)
3404                                 ldlm_lock_decref(lockh, LCK_PW);
3405                         else if (rqset)
3406                                 ldlm_lock_decref(lockh, einfo->ei_mode);
3407                         LDLM_LOCK_PUT(matched);
3408                         RETURN(ELDLM_OK);
3409                 } else
3410                         ldlm_lock_decref(lockh, mode);
3411                 LDLM_LOCK_PUT(matched);
3412         }
3413
3414  no_match:
3415         if (intent) {
3416                 CFS_LIST_HEAD(cancels);
3417                 req = ptlrpc_request_alloc(class_exp2cliimp(exp),
3418                                            &RQF_LDLM_ENQUEUE_LVB);
3419                 if (req == NULL)
3420                         RETURN(-ENOMEM);
3421
3422                 rc = ldlm_prep_enqueue_req(exp, req, &cancels, 0);
3423                 if (rc) {
3424                         ptlrpc_request_free(req);
3425                         RETURN(rc);
3426                 }
3427
3428                 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
3429                                      sizeof *lvb);
3430                 ptlrpc_request_set_replen(req);
3431         }
3432
3433         /* users of osc_enqueue() can pass this flag for ldlm_lock_match() */
3434         *flags &= ~LDLM_FL_BLOCK_GRANTED;
3435
3436         rc = ldlm_cli_enqueue(exp, &req, einfo, res_id, policy, flags, lvb,
3437                               sizeof(*lvb), lockh, async);
3438         if (rqset) {
3439                 if (!rc) {
3440                         struct osc_enqueue_args *aa;
3441                         CLASSERT (sizeof(*aa) <= sizeof(req->rq_async_args));
3442                         aa = ptlrpc_req_async_args(req);
3443                         aa->oa_ei = einfo;
3444                         aa->oa_exp = exp;
3445                         aa->oa_flags  = flags;
3446                         aa->oa_upcall = upcall;
3447                         aa->oa_cookie = cookie;
3448                         aa->oa_lvb    = lvb;
3449                         aa->oa_lockh  = lockh;
3450
3451                         req->rq_interpret_reply =
3452                                 (ptlrpc_interpterer_t)osc_enqueue_interpret;
3453                         if (rqset == PTLRPCD_SET)
3454                                 ptlrpcd_add_req(req, PSCOPE_OTHER);
3455                         else
3456                                 ptlrpc_set_add_req(rqset, req);
3457                 } else if (intent) {
3458                         ptlrpc_req_finished(req);
3459                 }
3460                 RETURN(rc);
3461         }
3462
3463         rc = osc_enqueue_fini(req, lvb, upcall, cookie, flags, rc);
3464         if (intent)
3465                 ptlrpc_req_finished(req);
3466
3467         RETURN(rc);
3468 }
3469
3470 static int osc_enqueue(struct obd_export *exp, struct obd_info *oinfo,
3471                        struct ldlm_enqueue_info *einfo,
3472                        struct ptlrpc_request_set *rqset)
3473 {
3474         struct ldlm_res_id res_id;
3475         int rc;
3476         ENTRY;
3477
3478         osc_build_res_name(oinfo->oi_md->lsm_object_id,
3479                            oinfo->oi_md->lsm_object_seq, &res_id);
3480
3481         rc = osc_enqueue_base(exp, &res_id, &oinfo->oi_flags, &oinfo->oi_policy,
3482                               &oinfo->oi_md->lsm_oinfo[0]->loi_lvb,
3483                               oinfo->oi_md->lsm_oinfo[0]->loi_kms_valid,
3484                               oinfo->oi_cb_up, oinfo, einfo, oinfo->oi_lockh,
3485                               rqset, rqset != NULL);
3486         RETURN(rc);
3487 }
3488
3489 int osc_match_base(struct obd_export *exp, struct ldlm_res_id *res_id,
3490                    __u32 type, ldlm_policy_data_t *policy, __u32 mode,
3491                    int *flags, void *data, struct lustre_handle *lockh,
3492                    int unref)
3493 {
3494         struct obd_device *obd = exp->exp_obd;
3495         int lflags = *flags;
3496         ldlm_mode_t rc;
3497         ENTRY;
3498
3499         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_MATCH))
3500                 RETURN(-EIO);
3501
3502         /* Filesystem lock extents are extended to page boundaries so that
3503          * dealing with the page cache is a little smoother */
3504         policy->l_extent.start -= policy->l_extent.start & ~CFS_PAGE_MASK;
3505         policy->l_extent.end |= ~CFS_PAGE_MASK;
3506
3507         /* Next, search for already existing extent locks that will cover us */
3508         /* If we're trying to read, we also search for an existing PW lock.  The
3509          * VFS and page cache already protect us locally, so lots of readers/
3510          * writers can share a single PW lock. */
3511         rc = mode;
3512         if (mode == LCK_PR)
3513                 rc |= LCK_PW;
3514         rc = ldlm_lock_match(obd->obd_namespace, lflags,
3515                              res_id, type, policy, rc, lockh, unref);
3516         if (rc) {
3517                 if (data != NULL) {
3518                         if (!osc_set_data_with_check(lockh, data)) {
3519                                 if (!(lflags & LDLM_FL_TEST_LOCK))
3520                                         ldlm_lock_decref(lockh, rc);
3521                                 RETURN(0);
3522                         }
3523                 }
3524                 if (!(lflags & LDLM_FL_TEST_LOCK) && mode != rc) {
3525                         ldlm_lock_addref(lockh, LCK_PR);
3526                         ldlm_lock_decref(lockh, LCK_PW);
3527                 }
3528                 RETURN(rc);
3529         }
3530         RETURN(rc);
3531 }
3532
3533 int osc_cancel_base(struct lustre_handle *lockh, __u32 mode)
3534 {
3535         ENTRY;
3536
3537         if (unlikely(mode == LCK_GROUP))
3538                 ldlm_lock_decref_and_cancel(lockh, mode);
3539         else
3540                 ldlm_lock_decref(lockh, mode);
3541
3542         RETURN(0);
3543 }
3544
3545 static int osc_cancel(struct obd_export *exp, struct lov_stripe_md *md,
3546                       __u32 mode, struct lustre_handle *lockh)
3547 {
3548         ENTRY;
3549         RETURN(osc_cancel_base(lockh, mode));
3550 }
3551
3552 static int osc_cancel_unused(struct obd_export *exp,
3553                              struct lov_stripe_md *lsm,
3554                              ldlm_cancel_flags_t flags,
3555                              void *opaque)
3556 {
3557         struct obd_device *obd = class_exp2obd(exp);
3558         struct ldlm_res_id res_id, *resp = NULL;
3559
3560         if (lsm != NULL) {
3561                 resp = osc_build_res_name(lsm->lsm_object_id,
3562                                           lsm->lsm_object_seq, &res_id);
3563         }
3564
3565         return ldlm_cli_cancel_unused(obd->obd_namespace, resp, flags, opaque);
3566 }
3567
3568 static int osc_statfs_interpret(const struct lu_env *env,
3569                                 struct ptlrpc_request *req,
3570                                 struct osc_async_args *aa, int rc)
3571 {
3572         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
3573         struct obd_statfs *msfs;
3574         __u64 used;
3575         ENTRY;
3576
3577         if (rc == -EBADR)
3578                 /* The request has in fact never been sent
3579                  * due to issues at a higher level (LOV).
3580                  * Exit immediately since the caller is
3581                  * aware of the problem and takes care
3582                  * of the clean up */
3583                  RETURN(rc);
3584
3585         if ((rc == -ENOTCONN || rc == -EAGAIN) &&
3586             (aa->aa_oi->oi_flags & OBD_STATFS_NODELAY))
3587                 GOTO(out, rc = 0);
3588
3589         if (rc != 0)
3590                 GOTO(out, rc);
3591
3592         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
3593         if (msfs == NULL) {
3594                 GOTO(out, rc = -EPROTO);
3595         }
3596
3597         /* Reinitialize the RDONLY and DEGRADED flags at the client
3598          * on each statfs, so they don't stay set permanently. */
3599         cfs_spin_lock(&cli->cl_oscc.oscc_lock);
3600
3601         if (unlikely(msfs->os_state & OS_STATE_DEGRADED))
3602                 cli->cl_oscc.oscc_flags |= OSCC_FLAG_DEGRADED;
3603         else if (unlikely(cli->cl_oscc.oscc_flags & OSCC_FLAG_DEGRADED))
3604                 cli->cl_oscc.oscc_flags &= ~OSCC_FLAG_DEGRADED;
3605
3606         if (unlikely(msfs->os_state & OS_STATE_READONLY))
3607                 cli->cl_oscc.oscc_flags |= OSCC_FLAG_RDONLY;
3608         else if (unlikely(cli->cl_oscc.oscc_flags & OSCC_FLAG_RDONLY))
3609                 cli->cl_oscc.oscc_flags &= ~OSCC_FLAG_RDONLY;
3610
3611         /* Add a bit of hysteresis so this flag isn't continually flapping,
3612          * and ensure that new files don't get extremely fragmented due to
3613          * only a small amount of available space in the filesystem.
3614          * We want to set the NOSPC flag when there is less than ~0.1% free
3615          * and clear it when there is at least ~0.2% free space, so:
3616          *                   avail < ~0.1% max          max = avail + used
3617          *            1025 * avail < avail + used       used = blocks - free
3618          *            1024 * avail < used
3619          *            1024 * avail < blocks - free
3620          *                   avail < ((blocks - free) >> 10)
3621          *
3622          * On very large disk, say 16TB 0.1% will be 16 GB. We don't want to
3623          * lose that amount of space so in those cases we report no space left
3624          * if their is less than 1 GB left.                             */
3625         used = min_t(__u64,(msfs->os_blocks - msfs->os_bfree) >> 10, 1 << 30);
3626         if (unlikely(((cli->cl_oscc.oscc_flags & OSCC_FLAG_NOSPC) == 0) &&
3627                      ((msfs->os_ffree < 32) || (msfs->os_bavail < used))))
3628                 cli->cl_oscc.oscc_flags |= OSCC_FLAG_NOSPC;
3629         else if (unlikely(((cli->cl_oscc.oscc_flags & OSCC_FLAG_NOSPC) != 0) &&
3630                           (msfs->os_ffree > 64) &&
3631                           (msfs->os_bavail > (used << 1)))) {
3632                 cli->cl_oscc.oscc_flags &= ~(OSCC_FLAG_NOSPC |
3633                                              OSCC_FLAG_NOSPC_BLK);
3634         }
3635
3636         if (unlikely(((cli->cl_oscc.oscc_flags & OSCC_FLAG_NOSPC) != 0) &&
3637                      (msfs->os_bavail < used)))
3638                 cli->cl_oscc.oscc_flags |= OSCC_FLAG_NOSPC_BLK;
3639
3640         cfs_spin_unlock(&cli->cl_oscc.oscc_lock);
3641
3642         *aa->aa_oi->oi_osfs = *msfs;
3643 out:
3644         rc = aa->aa_oi->oi_cb_up(aa->aa_oi, rc);
3645         RETURN(rc);
3646 }
3647
3648 static int osc_statfs_async(struct obd_device *obd, struct obd_info *oinfo,
3649                             __u64 max_age, struct ptlrpc_request_set *rqset)
3650 {
3651         struct ptlrpc_request *req;
3652         struct osc_async_args *aa;
3653         int                    rc;
3654         ENTRY;
3655
3656         /* We could possibly pass max_age in the request (as an absolute
3657          * timestamp or a "seconds.usec ago") so the target can avoid doing
3658          * extra calls into the filesystem if that isn't necessary (e.g.
3659          * during mount that would help a bit).  Having relative timestamps
3660          * is not so great if request processing is slow, while absolute
3661          * timestamps are not ideal because they need time synchronization. */
3662         req = ptlrpc_request_alloc(obd->u.cli.cl_import, &RQF_OST_STATFS);
3663         if (req == NULL)
3664                 RETURN(-ENOMEM);
3665
3666         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_STATFS);
3667         if (rc) {
3668                 ptlrpc_request_free(req);
3669                 RETURN(rc);
3670         }
3671         ptlrpc_request_set_replen(req);
3672         req->rq_request_portal = OST_CREATE_PORTAL;
3673         ptlrpc_at_set_req_timeout(req);
3674
3675         if (oinfo->oi_flags & OBD_STATFS_NODELAY) {
3676                 /* procfs requests not want stat in wait for avoid deadlock */
3677                 req->rq_no_resend = 1;
3678                 req->rq_no_delay = 1;
3679         }
3680
3681         req->rq_interpret_reply = (ptlrpc_interpterer_t)osc_statfs_interpret;
3682         CLASSERT (sizeof(*aa) <= sizeof(req->rq_async_args));
3683         aa = ptlrpc_req_async_args(req);
3684         aa->aa_oi = oinfo;
3685
3686         ptlrpc_set_add_req(rqset, req);
3687         RETURN(0);
3688 }
3689
3690 static int osc_statfs(struct obd_device *obd, struct obd_statfs *osfs,
3691                       __u64 max_age, __u32 flags)
3692 {
3693         struct obd_statfs     *msfs;
3694         struct ptlrpc_request *req;
3695         struct obd_import     *imp = NULL;
3696         int rc;
3697         ENTRY;
3698
3699         /*Since the request might also come from lprocfs, so we need
3700          *sync this with client_disconnect_export Bug15684*/
3701         cfs_down_read(&obd->u.cli.cl_sem);
3702         if (obd->u.cli.cl_import)
3703                 imp = class_import_get(obd->u.cli.cl_import);
3704         cfs_up_read(&obd->u.cli.cl_sem);
3705         if (!imp)
3706                 RETURN(-ENODEV);
3707
3708         /* We could possibly pass max_age in the request (as an absolute
3709          * timestamp or a "seconds.usec ago") so the target can avoid doing
3710          * extra calls into the filesystem if that isn't necessary (e.g.
3711          * during mount that would help a bit).  Having relative timestamps
3712          * is not so great if request processing is slow, while absolute
3713          * timestamps are not ideal because they need time synchronization. */
3714         req = ptlrpc_request_alloc(imp, &RQF_OST_STATFS);
3715
3716         class_import_put(imp);
3717
3718         if (req == NULL)
3719                 RETURN(-ENOMEM);
3720
3721         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_STATFS);
3722         if (rc) {
3723                 ptlrpc_request_free(req);
3724                 RETURN(rc);
3725         }
3726         ptlrpc_request_set_replen(req);
3727         req->rq_request_portal = OST_CREATE_PORTAL;
3728         ptlrpc_at_set_req_timeout(req);
3729
3730         if (flags & OBD_STATFS_NODELAY) {
3731                 /* procfs requests not want stat in wait for avoid deadlock */
3732                 req->rq_no_resend = 1;
3733                 req->rq_no_delay = 1;
3734         }
3735
3736         rc = ptlrpc_queue_wait(req);
3737         if (rc)
3738                 GOTO(out, rc);
3739
3740         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
3741         if (msfs == NULL) {
3742                 GOTO(out, rc = -EPROTO);
3743         }
3744
3745         *osfs = *msfs;
3746
3747         EXIT;
3748  out:
3749         ptlrpc_req_finished(req);
3750         return rc;
3751 }
3752
3753 /* Retrieve object striping information.
3754  *
3755  * @lmmu is a pointer to an in-core struct with lmm_ost_count indicating
3756  * the maximum number of OST indices which will fit in the user buffer.
3757  * lmm_magic must be LOV_MAGIC (we only use 1 slot here).
3758  */
3759 static int osc_getstripe(struct lov_stripe_md *lsm, struct lov_user_md *lump)
3760 {
3761         /* we use lov_user_md_v3 because it is larger than lov_user_md_v1 */
3762         struct lov_user_md_v3 lum, *lumk;
3763         struct lov_user_ost_data_v1 *lmm_objects;
3764         int rc = 0, lum_size;
3765         ENTRY;
3766
3767         if (!lsm)
3768                 RETURN(-ENODATA);
3769
3770         /* we only need the header part from user space to get lmm_magic and
3771          * lmm_stripe_count, (the header part is common to v1 and v3) */
3772         lum_size = sizeof(struct lov_user_md_v1);
3773         if (cfs_copy_from_user(&lum, lump, lum_size))
3774                 RETURN(-EFAULT);
3775
3776         if ((lum.lmm_magic != LOV_USER_MAGIC_V1) &&
3777             (lum.lmm_magic != LOV_USER_MAGIC_V3))
3778                 RETURN(-EINVAL);
3779
3780         /* lov_user_md_vX and lov_mds_md_vX must have the same size */
3781         LASSERT(sizeof(struct lov_user_md_v1) == sizeof(struct lov_mds_md_v1));
3782         LASSERT(sizeof(struct lov_user_md_v3) == sizeof(struct lov_mds_md_v3));
3783         LASSERT(sizeof(lum.lmm_objects[0]) == sizeof(lumk->lmm_objects[0]));
3784
3785         /* we can use lov_mds_md_size() to compute lum_size
3786          * because lov_user_md_vX and lov_mds_md_vX have the same size */
3787         if (lum.lmm_stripe_count > 0) {
3788                 lum_size = lov_mds_md_size(lum.lmm_stripe_count, lum.lmm_magic);
3789                 OBD_ALLOC(lumk, lum_size);
3790                 if (!lumk)
3791                         RETURN(-ENOMEM);
3792
3793                 if (lum.lmm_magic == LOV_USER_MAGIC_V1)
3794                         lmm_objects = &(((struct lov_user_md_v1 *)lumk)->lmm_objects[0]);
3795                 else
3796                         lmm_objects = &(lumk->lmm_objects[0]);
3797                 lmm_objects->l_object_id = lsm->lsm_object_id;
3798         } else {
3799                 lum_size = lov_mds_md_size(0, lum.lmm_magic);
3800                 lumk = &lum;
3801         }
3802
3803         lumk->lmm_object_id = lsm->lsm_object_id;
3804         lumk->lmm_object_seq = lsm->lsm_object_seq;
3805         lumk->lmm_stripe_count = 1;
3806
3807         if (cfs_copy_to_user(lump, lumk, lum_size))
3808                 rc = -EFAULT;
3809
3810         if (lumk != &lum)
3811                 OBD_FREE(lumk, lum_size);
3812
3813         RETURN(rc);
3814 }
3815
3816
3817 static int osc_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
3818                          void *karg, void *uarg)
3819 {
3820         struct obd_device *obd = exp->exp_obd;
3821         struct obd_ioctl_data *data = karg;
3822         int err = 0;
3823         ENTRY;
3824
3825         if (!cfs_try_module_get(THIS_MODULE)) {
3826                 CERROR("Can't get module. Is it alive?");
3827                 return -EINVAL;
3828         }
3829         switch (cmd) {
3830         case OBD_IOC_LOV_GET_CONFIG: {
3831                 char *buf;
3832                 struct lov_desc *desc;
3833                 struct obd_uuid uuid;
3834
3835                 buf = NULL;
3836                 len = 0;
3837                 if (obd_ioctl_getdata(&buf, &len, (void *)uarg))
3838                         GOTO(out, err = -EINVAL);
3839
3840                 data = (struct obd_ioctl_data *)buf;
3841
3842                 if (sizeof(*desc) > data->ioc_inllen1) {
3843                         obd_ioctl_freedata(buf, len);
3844                         GOTO(out, err = -EINVAL);
3845                 }
3846
3847                 if (data->ioc_inllen2 < sizeof(uuid)) {
3848                         obd_ioctl_freedata(buf, len);
3849                         GOTO(out, err = -EINVAL);
3850                 }
3851
3852                 desc = (struct lov_desc *)data->ioc_inlbuf1;
3853                 desc->ld_tgt_count = 1;
3854                 desc->ld_active_tgt_count = 1;
3855                 desc->ld_default_stripe_count = 1;
3856                 desc->ld_default_stripe_size = 0;
3857                 desc->ld_default_stripe_offset = 0;
3858                 desc->ld_pattern = 0;
3859                 memcpy(&desc->ld_uuid, &obd->obd_uuid, sizeof(uuid));
3860
3861                 memcpy(data->ioc_inlbuf2, &obd->obd_uuid, sizeof(uuid));
3862
3863                 err = cfs_copy_to_user((void *)uarg, buf, len);
3864                 if (err)
3865                         err = -EFAULT;
3866                 obd_ioctl_freedata(buf, len);
3867                 GOTO(out, err);
3868         }
3869         case LL_IOC_LOV_SETSTRIPE:
3870                 err = obd_alloc_memmd(exp, karg);
3871                 if (err > 0)
3872                         err = 0;
3873                 GOTO(out, err);
3874         case LL_IOC_LOV_GETSTRIPE:
3875                 err = osc_getstripe(karg, uarg);
3876                 GOTO(out, err);
3877         case OBD_IOC_CLIENT_RECOVER:
3878                 err = ptlrpc_recover_import(obd->u.cli.cl_import,
3879                                             data->ioc_inlbuf1, 0);
3880                 if (err > 0)
3881                         err = 0;
3882                 GOTO(out, err);
3883         case IOC_OSC_SET_ACTIVE:
3884                 err = ptlrpc_set_import_active(obd->u.cli.cl_import,
3885                                                data->ioc_offset);
3886                 GOTO(out, err);
3887         case OBD_IOC_POLL_QUOTACHECK:
3888                 err = lquota_poll_check(quota_interface, exp,
3889                                         (struct if_quotacheck *)karg);
3890                 GOTO(out, err);
3891         case OBD_IOC_PING_TARGET:
3892                 err = ptlrpc_obd_ping(obd);
3893                 GOTO(out, err);
3894         default:
3895                 CDEBUG(D_INODE, "unrecognised ioctl %#x by %s\n",
3896                        cmd, cfs_curproc_comm());
3897                 GOTO(out, err = -ENOTTY);
3898         }
3899 out:
3900         cfs_module_put(THIS_MODULE);
3901         return err;
3902 }
3903
3904 static int osc_get_info(struct obd_export *exp, obd_count keylen,
3905                         void *key, __u32 *vallen, void *val,
3906                         struct lov_stripe_md *lsm)
3907 {
3908         ENTRY;
3909         if (!vallen || !val)
3910                 RETURN(-EFAULT);
3911
3912         if (KEY_IS(KEY_LOCK_TO_STRIPE)) {
3913                 __u32 *stripe = val;
3914                 *vallen = sizeof(*stripe);
3915                 *stripe = 0;
3916                 RETURN(0);
3917         } else if (KEY_IS(KEY_LAST_ID)) {
3918                 struct ptlrpc_request *req;
3919                 obd_id                *reply;
3920                 char                  *tmp;
3921                 int                    rc;
3922
3923                 req = ptlrpc_request_alloc(class_exp2cliimp(exp),
3924                                            &RQF_OST_GET_INFO_LAST_ID);
3925                 if (req == NULL)
3926                         RETURN(-ENOMEM);
3927
3928                 req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_KEY,
3929                                      RCL_CLIENT, keylen);
3930                 rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GET_INFO);
3931                 if (rc) {
3932                         ptlrpc_request_free(req);
3933                         RETURN(rc);
3934                 }
3935
3936                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
3937                 memcpy(tmp, key, keylen);
3938
3939                 req->rq_no_delay = req->rq_no_resend = 1;
3940                 ptlrpc_request_set_replen(req);
3941                 rc = ptlrpc_queue_wait(req);
3942                 if (rc)
3943                         GOTO(out, rc);
3944
3945                 reply = req_capsule_server_get(&req->rq_pill, &RMF_OBD_ID);
3946                 if (reply == NULL)
3947                         GOTO(out, rc = -EPROTO);
3948
3949                 *((obd_id *)val) = *reply;
3950         out:
3951                 ptlrpc_req_finished(req);
3952                 RETURN(rc);
3953         } else if (KEY_IS(KEY_FIEMAP)) {
3954                 struct ptlrpc_request *req;
3955                 struct ll_user_fiemap *reply;
3956                 char *tmp;
3957                 int rc;
3958
3959                 req = ptlrpc_request_alloc(class_exp2cliimp(exp),
3960                                            &RQF_OST_GET_INFO_FIEMAP);
3961                 if (req == NULL)
3962                         RETURN(-ENOMEM);
3963
3964                 req_capsule_set_size(&req->rq_pill, &RMF_FIEMAP_KEY,
3965                                      RCL_CLIENT, keylen);
3966                 req_capsule_set_size(&req->rq_pill, &RMF_FIEMAP_VAL,
3967                                      RCL_CLIENT, *vallen);
3968                 req_capsule_set_size(&req->rq_pill, &RMF_FIEMAP_VAL,
3969                                      RCL_SERVER, *vallen);
3970
3971                 rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GET_INFO);
3972                 if (rc) {
3973                         ptlrpc_request_free(req);
3974                         RETURN(rc);
3975                 }
3976
3977                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_FIEMAP_KEY);
3978                 memcpy(tmp, key, keylen);
3979                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_FIEMAP_VAL);
3980                 memcpy(tmp, val, *vallen);
3981
3982                 ptlrpc_request_set_replen(req);
3983                 rc = ptlrpc_queue_wait(req);
3984                 if (rc)
3985                         GOTO(out1, rc);
3986
3987                 reply = req_capsule_server_get(&req->rq_pill, &RMF_FIEMAP_VAL);
3988                 if (reply == NULL)
3989                         GOTO(out1, rc = -EPROTO);
3990
3991                 memcpy(val, reply, *vallen);
3992         out1:
3993                 ptlrpc_req_finished(req);
3994
3995                 RETURN(rc);
3996         }
3997
3998         RETURN(-EINVAL);
3999 }
4000
4001 static int osc_setinfo_mds_connect_import(struct obd_import *imp)
4002 {
4003         struct llog_ctxt *ctxt;
4004         int rc = 0;
4005         ENTRY;
4006
4007         ctxt = llog_get_context(imp->imp_obd, LLOG_MDS_OST_ORIG_CTXT);
4008         if (ctxt) {
4009                 rc = llog_initiator_connect(ctxt);
4010                 llog_ctxt_put(ctxt);
4011         } else {
4012                 /* XXX return an error? skip setting below flags? */
4013         }
4014
4015         cfs_spin_lock(&imp->imp_lock);
4016         imp->imp_server_timeout = 1;
4017         imp->imp_pingable = 1;
4018         cfs_spin_unlock(&imp->imp_lock);
4019         CDEBUG(D_RPCTRACE, "pinging OST %s\n", obd2cli_tgt(imp->imp_obd));
4020
4021         RETURN(rc);
4022 }
4023
4024 static int osc_setinfo_mds_conn_interpret(const struct lu_env *env,
4025                                           struct ptlrpc_request *req,
4026                                           void *aa, int rc)
4027 {
4028         ENTRY;
4029         if (rc != 0)
4030                 RETURN(rc);
4031
4032         RETURN(osc_setinfo_mds_connect_import(req->rq_import));
4033 }
4034
4035 static int osc_set_info_async(struct obd_export *exp, obd_count keylen,
4036                               void *key, obd_count vallen, void *val,
4037                               struct ptlrpc_request_set *set)
4038 {
4039         struct ptlrpc_request *req;
4040         struct obd_device     *obd = exp->exp_obd;
4041         struct obd_import     *imp = class_exp2cliimp(exp);
4042         char                  *tmp;
4043         int                    rc;
4044         ENTRY;
4045
4046         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_SHUTDOWN, 10);
4047
4048         if (KEY_IS(KEY_NEXT_ID)) {
4049                 obd_id new_val;
4050                 struct osc_creator *oscc = &obd->u.cli.cl_oscc;
4051
4052                 if (vallen != sizeof(obd_id))
4053                         RETURN(-ERANGE);
4054                 if (val == NULL)
4055                         RETURN(-EINVAL);
4056
4057                 if (vallen != sizeof(obd_id))
4058                         RETURN(-EINVAL);
4059
4060                 /* avoid race between allocate new object and set next id
4061                  * from ll_sync thread */
4062                 cfs_spin_lock(&oscc->oscc_lock);
4063                 new_val = *((obd_id*)val) + 1;
4064                 if (new_val > oscc->oscc_next_id)
4065                         oscc->oscc_next_id = new_val;
4066                 cfs_spin_unlock(&oscc->oscc_lock);
4067                 CDEBUG(D_HA, "%s: set oscc_next_id = "LPU64"\n",
4068                        exp->exp_obd->obd_name,
4069                        obd->u.cli.cl_oscc.oscc_next_id);
4070
4071                 RETURN(0);
4072         }
4073
4074         if (KEY_IS(KEY_CHECKSUM)) {
4075                 if (vallen != sizeof(int))
4076                         RETURN(-EINVAL);
4077                 exp->exp_obd->u.cli.cl_checksum = (*(int *)val) ? 1 : 0;
4078                 RETURN(0);
4079         }
4080
4081         if (KEY_IS(KEY_SPTLRPC_CONF)) {
4082                 sptlrpc_conf_client_adapt(obd);
4083                 RETURN(0);
4084         }
4085
4086         if (KEY_IS(KEY_FLUSH_CTX)) {
4087                 sptlrpc_import_flush_my_ctx(imp);
4088                 RETURN(0);
4089         }
4090
4091         if (!set && !KEY_IS(KEY_GRANT_SHRINK))
4092                 RETURN(-EINVAL);
4093
4094         /* We pass all other commands directly to OST. Since nobody calls osc
4095            methods directly and everybody is supposed to go through LOV, we
4096            assume lov checked invalid values for us.
4097            The only recognised values so far are evict_by_nid and mds_conn.
4098            Even if something bad goes through, we'd get a -EINVAL from OST
4099            anyway. */
4100
4101         if (KEY_IS(KEY_GRANT_SHRINK))
4102                 req = ptlrpc_request_alloc(imp, &RQF_OST_SET_GRANT_INFO);
4103         else
4104                 req = ptlrpc_request_alloc(imp, &RQF_OBD_SET_INFO);
4105
4106         if (req == NULL)
4107                 RETURN(-ENOMEM);
4108
4109         req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_KEY,
4110                              RCL_CLIENT, keylen);
4111         req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_VAL,
4112                              RCL_CLIENT, vallen);
4113         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SET_INFO);
4114         if (rc) {
4115                 ptlrpc_request_free(req);
4116                 RETURN(rc);
4117         }
4118
4119         tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
4120         memcpy(tmp, key, keylen);
4121         tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_VAL);
4122         memcpy(tmp, val, vallen);
4123
4124         if (KEY_IS(KEY_MDS_CONN)) {
4125                 struct osc_creator *oscc = &obd->u.cli.cl_oscc;
4126
4127                 oscc->oscc_oa.o_seq = (*(__u32 *)val);
4128                 oscc->oscc_oa.o_valid |= OBD_MD_FLGROUP;
4129                 LASSERT_SEQ_IS_MDT(oscc->oscc_oa.o_seq);
4130                 req->rq_no_delay = req->rq_no_resend = 1;
4131                 req->rq_interpret_reply = osc_setinfo_mds_conn_interpret;
4132         } else if (KEY_IS(KEY_GRANT_SHRINK)) {
4133                 struct osc_grant_args *aa;
4134                 struct obdo *oa;
4135
4136                 CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
4137                 aa = ptlrpc_req_async_args(req);
4138                 OBDO_ALLOC(oa);
4139                 if (!oa) {
4140                         ptlrpc_req_finished(req);
4141                         RETURN(-ENOMEM);
4142                 }
4143                 *oa = ((struct ost_body *)val)->oa;
4144                 aa->aa_oa = oa;
4145                 req->rq_interpret_reply = osc_shrink_grant_interpret;
4146         }
4147
4148         ptlrpc_request_set_replen(req);
4149         if (!KEY_IS(KEY_GRANT_SHRINK)) {
4150                 LASSERT(set != NULL);
4151                 ptlrpc_set_add_req(set, req);
4152                 ptlrpc_check_set(NULL, set);
4153         } else
4154                 ptlrpcd_add_req(req, PSCOPE_OTHER);
4155
4156         RETURN(0);
4157 }
4158
4159
4160 static struct llog_operations osc_size_repl_logops = {
4161         lop_cancel: llog_obd_repl_cancel
4162 };
4163
4164 static struct llog_operations osc_mds_ost_orig_logops;
4165
4166 static int __osc_llog_init(struct obd_device *obd, struct obd_llog_group *olg,
4167                            struct obd_device *tgt, struct llog_catid *catid)
4168 {
4169         int rc;
4170         ENTRY;
4171
4172         rc = llog_setup(obd, &obd->obd_olg, LLOG_MDS_OST_ORIG_CTXT, tgt, 1,
4173                         &catid->lci_logid, &osc_mds_ost_orig_logops);
4174         if (rc) {
4175                 CERROR("failed LLOG_MDS_OST_ORIG_CTXT\n");
4176                 GOTO(out, rc);
4177         }
4178
4179         rc = llog_setup(obd, &obd->obd_olg, LLOG_SIZE_REPL_CTXT, tgt, 1,
4180                         NULL, &osc_size_repl_logops);
4181         if (rc) {
4182                 struct llog_ctxt *ctxt =
4183                         llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
4184                 if (ctxt)
4185                         llog_cleanup(ctxt);
4186                 CERROR("failed LLOG_SIZE_REPL_CTXT\n");
4187         }
4188         GOTO(out, rc);
4189 out:
4190         if (rc) {
4191                 CERROR("osc '%s' tgt '%s' catid %p rc=%d\n",
4192                        obd->obd_name, tgt->obd_name, catid, rc);
4193                 CERROR("logid "LPX64":0x%x\n",
4194                        catid->lci_logid.lgl_oid, catid->lci_logid.lgl_ogen);
4195         }
4196         return rc;
4197 }
4198
4199 static int osc_llog_init(struct obd_device *obd, struct obd_llog_group *olg,
4200                          struct obd_device *disk_obd, int *index)
4201 {
4202         struct llog_catid catid;
4203         static char name[32] = CATLIST;
4204         int rc;
4205         ENTRY;
4206
4207         LASSERT(olg == &obd->obd_olg);
4208
4209         cfs_mutex_down(&olg->olg_cat_processing);
4210         rc = llog_get_cat_list(disk_obd, name, *index, 1, &catid);
4211         if (rc) {
4212                 CERROR("rc: %d\n", rc);
4213                 GOTO(out, rc);
4214         }
4215
4216         CDEBUG(D_INFO, "%s: Init llog for %d - catid "LPX64"/"LPX64":%x\n",
4217                obd->obd_name, *index, catid.lci_logid.lgl_oid,
4218                catid.lci_logid.lgl_oseq, catid.lci_logid.lgl_ogen);
4219
4220         rc = __osc_llog_init(obd, olg, disk_obd, &catid);
4221         if (rc) {
4222                 CERROR("rc: %d\n", rc);
4223                 GOTO(out, rc);
4224         }
4225
4226         rc = llog_put_cat_list(disk_obd, name, *index, 1, &catid);
4227         if (rc) {
4228                 CERROR("rc: %d\n", rc);
4229                 GOTO(out, rc);
4230         }
4231
4232  out:
4233         cfs_mutex_up(&olg->olg_cat_processing);
4234
4235         return rc;
4236 }
4237
4238 static int osc_llog_finish(struct obd_device *obd, int count)
4239 {
4240         struct llog_ctxt *ctxt;
4241         int rc = 0, rc2 = 0;
4242         ENTRY;
4243
4244         ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
4245         if (ctxt)
4246                 rc = llog_cleanup(ctxt);
4247
4248         ctxt = llog_get_context(obd, LLOG_SIZE_REPL_CTXT);
4249         if (ctxt)
4250                 rc2 = llog_cleanup(ctxt);
4251         if (!rc)
4252                 rc = rc2;
4253
4254         RETURN(rc);
4255 }
4256
4257 static int osc_reconnect(const struct lu_env *env,
4258                          struct obd_export *exp, struct obd_device *obd,
4259                          struct obd_uuid *cluuid,
4260                          struct obd_connect_data *data,
4261                          void *localdata)
4262 {
4263         struct client_obd *cli = &obd->u.cli;
4264
4265         if (data != NULL && (data->ocd_connect_flags & OBD_CONNECT_GRANT)) {
4266                 long lost_grant;
4267
4268                 client_obd_list_lock(&cli->cl_loi_list_lock);
4269                 data->ocd_grant = (cli->cl_avail_grant + cli->cl_dirty) ?:
4270                                 2 * cli->cl_max_pages_per_rpc << CFS_PAGE_SHIFT;
4271                 lost_grant = cli->cl_lost_grant;
4272                 cli->cl_lost_grant = 0;
4273                 client_obd_list_unlock(&cli->cl_loi_list_lock);
4274
4275                 CDEBUG(D_CACHE, "request ocd_grant: %d cl_avail_grant: %ld "
4276                        "cl_dirty: %ld cl_lost_grant: %ld\n", data->ocd_grant,
4277                        cli->cl_avail_grant, cli->cl_dirty, lost_grant);
4278                 CDEBUG(D_RPCTRACE, "ocd_connect_flags: "LPX64" ocd_version: %d"
4279                        " ocd_grant: %d\n", data->ocd_connect_flags,
4280                        data->ocd_version, data->ocd_grant);
4281         }
4282
4283         RETURN(0);
4284 }
4285
4286 static int osc_disconnect(struct obd_export *exp)
4287 {
4288         struct obd_device *obd = class_exp2obd(exp);
4289         struct llog_ctxt  *ctxt;
4290         int rc;
4291
4292         ctxt = llog_get_context(obd, LLOG_SIZE_REPL_CTXT);
4293         if (ctxt) {
4294                 if (obd->u.cli.cl_conn_count == 1) {
4295                         /* Flush any remaining cancel messages out to the
4296                          * target */
4297                         llog_sync(ctxt, exp);
4298                 }
4299                 llog_ctxt_put(ctxt);
4300         } else {
4301                 CDEBUG(D_HA, "No LLOG_SIZE_REPL_CTXT found in obd %p\n",
4302                        obd);
4303         }
4304
4305         rc = client_disconnect_export(exp);
4306         /**
4307          * Initially we put del_shrink_grant before disconnect_export, but it
4308          * causes the following problem if setup (connect) and cleanup
4309          * (disconnect) are tangled together.
4310          *      connect p1                     disconnect p2
4311          *   ptlrpc_connect_import
4312          *     ...............               class_manual_cleanup
4313          *                                     osc_disconnect
4314          *                                     del_shrink_grant
4315          *   ptlrpc_connect_interrupt
4316          *     init_grant_shrink
4317          *   add this client to shrink list
4318          *                                      cleanup_osc
4319          * Bang! pinger trigger the shrink.
4320          * So the osc should be disconnected from the shrink list, after we
4321          * are sure the import has been destroyed. BUG18662
4322          */
4323         if (obd->u.cli.cl_import == NULL)
4324                 osc_del_shrink_grant(&obd->u.cli);
4325         return rc;
4326 }
4327
4328 static int osc_import_event(struct obd_device *obd,
4329                             struct obd_import *imp,
4330                             enum obd_import_event event)
4331 {
4332         struct client_obd *cli;
4333         int rc = 0;
4334
4335         ENTRY;
4336         LASSERT(imp->imp_obd == obd);
4337
4338         switch (event) {
4339         case IMP_EVENT_DISCON: {
4340                 /* Only do this on the MDS OSC's */
4341                 if (imp->imp_server_timeout) {
4342                         struct osc_creator *oscc = &obd->u.cli.cl_oscc;
4343
4344                         cfs_spin_lock(&oscc->oscc_lock);
4345                         oscc->oscc_flags |= OSCC_FLAG_RECOVERING;
4346                         cfs_spin_unlock(&oscc->oscc_lock);
4347                 }
4348                 cli = &obd->u.cli;
4349                 client_obd_list_lock(&cli->cl_loi_list_lock);
4350                 cli->cl_avail_grant = 0;
4351                 cli->cl_lost_grant = 0;
4352                 client_obd_list_unlock(&cli->cl_loi_list_lock);
4353                 break;
4354         }
4355         case IMP_EVENT_INACTIVE: {
4356                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_INACTIVE, NULL);
4357                 break;
4358         }
4359         case IMP_EVENT_INVALIDATE: {
4360                 struct ldlm_namespace *ns = obd->obd_namespace;
4361                 struct lu_env         *env;
4362                 int                    refcheck;
4363
4364                 env = cl_env_get(&refcheck);
4365                 if (!IS_ERR(env)) {
4366                         /* Reset grants */
4367                         cli = &obd->u.cli;
4368                         client_obd_list_lock(&cli->cl_loi_list_lock);
4369                         /* all pages go to failing rpcs due to the invalid
4370                          * import */
4371                         osc_check_rpcs(env, cli);
4372                         client_obd_list_unlock(&cli->cl_loi_list_lock);
4373
4374                         ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
4375                         cl_env_put(env, &refcheck);
4376                 } else
4377                         rc = PTR_ERR(env);
4378                 break;
4379         }
4380         case IMP_EVENT_ACTIVE: {
4381                 /* Only do this on the MDS OSC's */
4382                 if (imp->imp_server_timeout) {
4383                         struct osc_creator *oscc = &obd->u.cli.cl_oscc;
4384
4385                         cfs_spin_lock(&oscc->oscc_lock);
4386                         oscc->oscc_flags &= ~(OSCC_FLAG_NOSPC |
4387                                               OSCC_FLAG_NOSPC_BLK);
4388                         cfs_spin_unlock(&oscc->oscc_lock);
4389                 }
4390                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_ACTIVE, NULL);
4391                 break;
4392         }
4393         case IMP_EVENT_OCD: {
4394                 struct obd_connect_data *ocd = &imp->imp_connect_data;
4395
4396                 if (ocd->ocd_connect_flags & OBD_CONNECT_GRANT)
4397                         osc_init_grant(&obd->u.cli, ocd);
4398
4399                 /* See bug 7198 */
4400                 if (ocd->ocd_connect_flags & OBD_CONNECT_REQPORTAL)
4401                         imp->imp_client->cli_request_portal =OST_REQUEST_PORTAL;
4402
4403                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_OCD, NULL);
4404                 break;
4405         }
4406         case IMP_EVENT_DEACTIVATE: {
4407                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_DEACTIVATE, NULL);
4408                 break;
4409         }
4410         case IMP_EVENT_ACTIVATE: {
4411                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_ACTIVATE, NULL);
4412                 break;
4413         }
4414         default:
4415                 CERROR("Unknown import event %d\n", event);
4416                 LBUG();
4417         }
4418         RETURN(rc);
4419 }
4420
4421 /**
4422  * Determine whether the lock can be canceled before replaying the lock
4423  * during recovery, see bug16774 for detailed information.
4424  *
4425  * \retval zero the lock can't be canceled
4426  * \retval other ok to cancel
4427  */
4428 static int osc_cancel_for_recovery(struct ldlm_lock *lock)
4429 {
4430         check_res_locked(lock->l_resource);
4431
4432         /*
4433          * Cancel all unused extent lock in granted mode LCK_PR or LCK_CR.
4434          *
4435          * XXX as a future improvement, we can also cancel unused write lock
4436          * if it doesn't have dirty data and active mmaps.
4437          */
4438         if (lock->l_resource->lr_type == LDLM_EXTENT &&
4439             (lock->l_granted_mode == LCK_PR ||
4440              lock->l_granted_mode == LCK_CR) &&
4441             (osc_dlm_lock_pageref(lock) == 0))
4442                 RETURN(1);
4443
4444         RETURN(0);
4445 }
4446
4447 int osc_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
4448 {
4449         int rc;
4450         ENTRY;
4451
4452         ENTRY;
4453         rc = ptlrpcd_addref();
4454         if (rc)
4455                 RETURN(rc);
4456
4457         rc = client_obd_setup(obd, lcfg);
4458         if (rc) {
4459                 ptlrpcd_decref();
4460         } else {
4461                 struct lprocfs_static_vars lvars = { 0 };
4462                 struct client_obd *cli = &obd->u.cli;
4463
4464                 cli->cl_grant_shrink_interval = GRANT_SHRINK_INTERVAL;
4465                 lprocfs_osc_init_vars(&lvars);
4466                 if (lprocfs_obd_setup(obd, lvars.obd_vars) == 0) {
4467                         lproc_osc_attach_seqstat(obd);
4468                         sptlrpc_lprocfs_cliobd_attach(obd);
4469                         ptlrpc_lprocfs_register_obd(obd);
4470                 }
4471
4472                 oscc_init(obd);
4473                 /* We need to allocate a few requests more, because
4474                    brw_interpret tries to create new requests before freeing
4475                    previous ones. Ideally we want to have 2x max_rpcs_in_flight
4476                    reserved, but I afraid that might be too much wasted RAM
4477                    in fact, so 2 is just my guess and still should work. */
4478                 cli->cl_import->imp_rq_pool =
4479                         ptlrpc_init_rq_pool(cli->cl_max_rpcs_in_flight + 2,
4480                                             OST_MAXREQSIZE,
4481                                             ptlrpc_add_rqs_to_pool);
4482
4483                 CFS_INIT_LIST_HEAD(&cli->cl_grant_shrink_list);
4484                 cfs_sema_init(&cli->cl_grant_sem, 1);
4485
4486                 ns_register_cancel(obd->obd_namespace, osc_cancel_for_recovery);
4487         }
4488
4489         RETURN(rc);
4490 }
4491
4492 static int osc_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
4493 {
4494         int rc = 0;
4495         ENTRY;
4496
4497         switch (stage) {
4498         case OBD_CLEANUP_EARLY: {
4499                 struct obd_import *imp;
4500                 imp = obd->u.cli.cl_import;
4501                 CDEBUG(D_HA, "Deactivating import %s\n", obd->obd_name);
4502                 /* ptlrpc_abort_inflight to stop an mds_lov_synchronize */
4503                 ptlrpc_deactivate_import(imp);
4504                 cfs_spin_lock(&imp->imp_lock);
4505                 imp->imp_pingable = 0;
4506                 cfs_spin_unlock(&imp->imp_lock);
4507                 break;
4508         }
4509         case OBD_CLEANUP_EXPORTS: {
4510                 /* LU-464
4511                  * for echo client, export may be on zombie list, wait for
4512                  * zombie thread to cull it, because cli.cl_import will be
4513                  * cleared in client_disconnect_export():
4514                  *   class_export_destroy() -> obd_cleanup() ->
4515                  *   echo_device_free() -> echo_client_cleanup() ->
4516                  *   obd_disconnect() -> osc_disconnect() ->
4517                  *   client_disconnect_export()
4518                  */
4519                 obd_zombie_barrier();
4520                 obd_cleanup_client_import(obd);
4521                 rc = obd_llog_finish(obd, 0);
4522                 if (rc != 0)
4523                         CERROR("failed to cleanup llogging subsystems\n");
4524                 break;
4525                 }
4526         }
4527         RETURN(rc);
4528 }
4529
4530 int osc_cleanup(struct obd_device *obd)
4531 {
4532         int rc;
4533
4534         ENTRY;
4535         ptlrpc_lprocfs_unregister_obd(obd);
4536         lprocfs_obd_cleanup(obd);
4537
4538         /* free memory of osc quota cache */
4539         lquota_cleanup(quota_interface, obd);
4540
4541         rc = client_obd_cleanup(obd);
4542
4543         ptlrpcd_decref();
4544         RETURN(rc);
4545 }
4546
4547 int osc_process_config_base(struct obd_device *obd, struct lustre_cfg *lcfg)
4548 {
4549         struct lprocfs_static_vars lvars = { 0 };
4550         int rc = 0;
4551
4552         lprocfs_osc_init_vars(&lvars);
4553
4554         switch (lcfg->lcfg_command) {
4555         default:
4556                 rc = class_process_proc_param(PARAM_OSC, lvars.obd_vars,
4557                                               lcfg, obd);
4558                 if (rc > 0)
4559                         rc = 0;
4560                 break;
4561         }
4562
4563         return(rc);
4564 }
4565
4566 static int osc_process_config(struct obd_device *obd, obd_count len, void *buf)
4567 {
4568         return osc_process_config_base(obd, buf);
4569 }
4570
4571 struct obd_ops osc_obd_ops = {
4572         .o_owner                = THIS_MODULE,
4573         .o_setup                = osc_setup,
4574         .o_precleanup           = osc_precleanup,
4575         .o_cleanup              = osc_cleanup,
4576         .o_add_conn             = client_import_add_conn,
4577         .o_del_conn             = client_import_del_conn,
4578         .o_connect              = client_connect_import,
4579         .o_reconnect            = osc_reconnect,
4580         .o_disconnect           = osc_disconnect,
4581         .o_statfs               = osc_statfs,
4582         .o_statfs_async         = osc_statfs_async,
4583         .o_packmd               = osc_packmd,
4584         .o_unpackmd             = osc_unpackmd,
4585         .o_precreate            = osc_precreate,
4586         .o_create               = osc_create,
4587         .o_create_async         = osc_create_async,
4588         .o_destroy              = osc_destroy,
4589         .o_getattr              = osc_getattr,
4590         .o_getattr_async        = osc_getattr_async,
4591         .o_setattr              = osc_setattr,
4592         .o_setattr_async        = osc_setattr_async,
4593         .o_brw                  = osc_brw,
4594         .o_punch                = osc_punch,
4595         .o_sync                 = osc_sync,
4596         .o_enqueue              = osc_enqueue,
4597         .o_change_cbdata        = osc_change_cbdata,
4598         .o_find_cbdata          = osc_find_cbdata,
4599         .o_cancel               = osc_cancel,
4600         .o_cancel_unused        = osc_cancel_unused,
4601         .o_iocontrol            = osc_iocontrol,
4602         .o_get_info             = osc_get_info,
4603         .o_set_info_async       = osc_set_info_async,
4604         .o_import_event         = osc_import_event,
4605         .o_llog_init            = osc_llog_init,
4606         .o_llog_finish          = osc_llog_finish,
4607         .o_process_config       = osc_process_config,
4608 };
4609
4610 extern struct lu_kmem_descr osc_caches[];
4611 extern cfs_spinlock_t       osc_ast_guard;
4612 extern cfs_lock_class_key_t osc_ast_guard_class;
4613
4614 int __init osc_init(void)
4615 {
4616         struct lprocfs_static_vars lvars = { 0 };
4617         int rc;
4618         ENTRY;
4619
4620         /* print an address of _any_ initialized kernel symbol from this
4621          * module, to allow debugging with gdb that doesn't support data
4622          * symbols from modules.*/
4623         CDEBUG(D_CONSOLE, "Lustre OSC module (%p).\n", &osc_caches);
4624
4625         rc = lu_kmem_init(osc_caches);
4626
4627         lprocfs_osc_init_vars(&lvars);
4628
4629         cfs_request_module("lquota");
4630         quota_interface = PORTAL_SYMBOL_GET(osc_quota_interface);
4631         lquota_init(quota_interface);
4632         init_obd_quota_ops(quota_interface, &osc_obd_ops);
4633
4634         rc = class_register_type(&osc_obd_ops, NULL, lvars.module_vars,
4635                                  LUSTRE_OSC_NAME, &osc_device_type);
4636         if (rc) {
4637                 if (quota_interface)
4638                         PORTAL_SYMBOL_PUT(osc_quota_interface);
4639                 lu_kmem_fini(osc_caches);
4640                 RETURN(rc);
4641         }
4642
4643         cfs_spin_lock_init(&osc_ast_guard);
4644         cfs_lockdep_set_class(&osc_ast_guard, &osc_ast_guard_class);
4645
4646         osc_mds_ost_orig_logops = llog_lvfs_ops;
4647         osc_mds_ost_orig_logops.lop_setup = llog_obd_origin_setup;
4648         osc_mds_ost_orig_logops.lop_cleanup = llog_obd_origin_cleanup;
4649         osc_mds_ost_orig_logops.lop_add = llog_obd_origin_add;
4650         osc_mds_ost_orig_logops.lop_connect = llog_origin_connect;
4651
4652         RETURN(rc);
4653 }
4654
4655 #ifdef __KERNEL__
4656 static void /*__exit*/ osc_exit(void)
4657 {
4658         lu_device_type_fini(&osc_device_type);
4659
4660         lquota_exit(quota_interface);
4661         if (quota_interface)
4662                 PORTAL_SYMBOL_PUT(osc_quota_interface);
4663
4664         class_unregister_type(LUSTRE_OSC_NAME);
4665         lu_kmem_fini(osc_caches);
4666 }
4667
4668 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
4669 MODULE_DESCRIPTION("Lustre Object Storage Client (OSC)");
4670 MODULE_LICENSE("GPL");
4671
4672 cfs_module(osc, LUSTRE_VERSION_STRING, osc_init, osc_exit);
4673 #endif