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 (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
1353                 LASSERT(pg->count > 0);
1354                 LASSERTF((pg->off & ~CFS_PAGE_MASK) + pg->count <= CFS_PAGE_SIZE,
1355                          "i: %d pg: %p off: "LPU64", count: %u\n", i, pg,
1356                          pg->off, pg->count);
1357 #ifdef __linux__
1358                 LASSERTF(i == 0 || pg->off > pg_prev->off,
1359                          "i %d p_c %u pg %p [pri %lu ind %lu] off "LPU64
1360                          " prev_pg %p [pri %lu ind %lu] off "LPU64"\n",
1361                          i, page_count,
1362                          pg->pg, page_private(pg->pg), pg->pg->index, pg->off,
1363                          pg_prev->pg, page_private(pg_prev->pg),
1364                          pg_prev->pg->index, pg_prev->off);
1365 #else
1366                 LASSERTF(i == 0 || pg->off > pg_prev->off,
1367                          "i %d p_c %u\n", i, page_count);
1368 #endif
1369                 LASSERT((pga[0]->flag & OBD_BRW_SRVLOCK) ==
1370                         (pg->flag & OBD_BRW_SRVLOCK));
1371
1372                 ptlrpc_prep_bulk_page(desc, pg->pg, pg->off & ~CFS_PAGE_MASK,
1373                                       pg->count);
1374                 requested_nob += pg->count;
1375
1376                 if (i > 0 && can_merge_pages(pg_prev, pg)) {
1377                         niobuf--;
1378                         niobuf->len += pg->count;
1379                 } else {
1380                         niobuf->offset = pg->off;
1381                         niobuf->len    = pg->count;
1382                         niobuf->flags  = pg->flag;
1383                 }
1384                 pg_prev = pg;
1385         }
1386
1387         LASSERTF((void *)(niobuf - niocount) ==
1388                 req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE),
1389                 "want %p - real %p\n", req_capsule_client_get(&req->rq_pill,
1390                 &RMF_NIOBUF_REMOTE), (void *)(niobuf - niocount));
1391
1392         osc_announce_cached(cli, &body->oa, opc == OST_WRITE ? requested_nob:0);
1393         if (resend) {
1394                 if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0) {
1395                         body->oa.o_valid |= OBD_MD_FLFLAGS;
1396                         body->oa.o_flags = 0;
1397                 }
1398                 body->oa.o_flags |= OBD_FL_RECOV_RESEND;
1399         }
1400
1401         if (osc_should_shrink_grant(cli))
1402                 osc_shrink_grant_local(cli, &body->oa);
1403
1404         /* size[REQ_REC_OFF] still sizeof (*body) */
1405         if (opc == OST_WRITE) {
1406                 if (unlikely(cli->cl_checksum) &&
1407                     !sptlrpc_flavor_has_bulk(&req->rq_flvr)) {
1408                         /* store cl_cksum_type in a local variable since
1409                          * it can be changed via lprocfs */
1410                         cksum_type_t cksum_type = cli->cl_cksum_type;
1411
1412                         if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0) {
1413                                 oa->o_flags &= OBD_FL_LOCAL_MASK;
1414                                 body->oa.o_flags = 0;
1415                         }
1416                         body->oa.o_flags |= cksum_type_pack(cksum_type);
1417                         body->oa.o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1418                         body->oa.o_cksum = osc_checksum_bulk(requested_nob,
1419                                                              page_count, pga,
1420                                                              OST_WRITE,
1421                                                              cksum_type);
1422                         CDEBUG(D_PAGE, "checksum at write origin: %x\n",
1423                                body->oa.o_cksum);
1424                         /* save this in 'oa', too, for later checking */
1425                         oa->o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1426                         oa->o_flags |= cksum_type_pack(cksum_type);
1427                 } else {
1428                         /* clear out the checksum flag, in case this is a
1429                          * resend but cl_checksum is no longer set. b=11238 */
1430                         oa->o_valid &= ~OBD_MD_FLCKSUM;
1431                 }
1432                 oa->o_cksum = body->oa.o_cksum;
1433                 /* 1 RC per niobuf */
1434                 req_capsule_set_size(pill, &RMF_RCS, RCL_SERVER,
1435                                      sizeof(__u32) * niocount);
1436         } else {
1437                 if (unlikely(cli->cl_checksum) &&
1438                     !sptlrpc_flavor_has_bulk(&req->rq_flvr)) {
1439                         if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0)
1440                                 body->oa.o_flags = 0;
1441                         body->oa.o_flags |= cksum_type_pack(cli->cl_cksum_type);
1442                         body->oa.o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1443                 }
1444         }
1445         ptlrpc_request_set_replen(req);
1446
1447         CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
1448         aa = ptlrpc_req_async_args(req);
1449         aa->aa_oa = oa;
1450         aa->aa_requested_nob = requested_nob;
1451         aa->aa_nio_count = niocount;
1452         aa->aa_page_count = page_count;
1453         aa->aa_resends = 0;
1454         aa->aa_ppga = pga;
1455         aa->aa_cli = cli;
1456         CFS_INIT_LIST_HEAD(&aa->aa_oaps);
1457         if (ocapa && reserve)
1458                 aa->aa_ocapa = capa_get(ocapa);
1459
1460         *reqp = req;
1461         RETURN(0);
1462
1463  out:
1464         ptlrpc_req_finished(req);
1465         RETURN(rc);
1466 }
1467
1468 static int check_write_checksum(struct obdo *oa, const lnet_process_id_t *peer,
1469                                 __u32 client_cksum, __u32 server_cksum, int nob,
1470                                 obd_count page_count, struct brw_page **pga,
1471                                 cksum_type_t client_cksum_type)
1472 {
1473         __u32 new_cksum;
1474         char *msg;
1475         cksum_type_t cksum_type;
1476
1477         if (server_cksum == client_cksum) {
1478                 CDEBUG(D_PAGE, "checksum %x confirmed\n", client_cksum);
1479                 return 0;
1480         }
1481
1482         /* If this is mmaped file - it can be changed at any time */
1483         if (oa->o_valid & OBD_MD_FLFLAGS && oa->o_flags & OBD_FL_MMAP)
1484                 return 1;
1485
1486         if (oa->o_valid & OBD_MD_FLFLAGS)
1487                 cksum_type = cksum_type_unpack(oa->o_flags);
1488         else
1489                 cksum_type = OBD_CKSUM_CRC32;
1490
1491         new_cksum = osc_checksum_bulk(nob, page_count, pga, OST_WRITE,
1492                                       cksum_type);
1493
1494         if (cksum_type != client_cksum_type)
1495                 msg = "the server did not use the checksum type specified in "
1496                       "the original request - likely a protocol problem";
1497         else if (new_cksum == server_cksum)
1498                 msg = "changed on the client after we checksummed it - "
1499                       "likely false positive due to mmap IO (bug 11742)";
1500         else if (new_cksum == client_cksum)
1501                 msg = "changed in transit before arrival at OST";
1502         else
1503                 msg = "changed in transit AND doesn't match the original - "
1504                       "likely false positive due to mmap IO (bug 11742)";
1505
1506         LCONSOLE_ERROR_MSG(0x132, "BAD WRITE CHECKSUM: %s: from %s inode "DFID
1507                            " object "LPU64"/"LPU64" extent ["LPU64"-"LPU64"]\n",
1508                            msg, libcfs_nid2str(peer->nid),
1509                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_seq : (__u64)0,
1510                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_oid : 0,
1511                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_ver : 0,
1512                            oa->o_id,
1513                            oa->o_valid & OBD_MD_FLGROUP ? oa->o_seq : (__u64)0,
1514                            pga[0]->off,
1515                            pga[page_count-1]->off + pga[page_count-1]->count - 1);
1516         CERROR("original client csum %x (type %x), server csum %x (type %x), "
1517                "client csum now %x\n", client_cksum, client_cksum_type,
1518                server_cksum, cksum_type, new_cksum);
1519         return 1;
1520 }
1521
1522 /* Note rc enters this function as number of bytes transferred */
1523 static int osc_brw_fini_request(struct ptlrpc_request *req, int rc)
1524 {
1525         struct osc_brw_async_args *aa = (void *)&req->rq_async_args;
1526         const lnet_process_id_t *peer =
1527                         &req->rq_import->imp_connection->c_peer;
1528         struct client_obd *cli = aa->aa_cli;
1529         struct ost_body *body;
1530         __u32 client_cksum = 0;
1531         ENTRY;
1532
1533         if (rc < 0 && rc != -EDQUOT) {
1534                 DEBUG_REQ(D_INFO, req, "Failed request with rc = %d\n", rc);
1535                 RETURN(rc);
1536         }
1537
1538         LASSERTF(req->rq_repmsg != NULL, "rc = %d\n", rc);
1539         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
1540         if (body == NULL) {
1541                 DEBUG_REQ(D_INFO, req, "Can't unpack body\n");
1542                 RETURN(-EPROTO);
1543         }
1544
1545 #ifdef HAVE_QUOTA_SUPPORT
1546         /* set/clear over quota flag for a uid/gid */
1547         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE &&
1548             body->oa.o_valid & (OBD_MD_FLUSRQUOTA | OBD_MD_FLGRPQUOTA)) {
1549                 unsigned int qid[MAXQUOTAS] = { body->oa.o_uid, body->oa.o_gid };
1550
1551                 CDEBUG(D_QUOTA, "setdq for [%u %u] with valid "LPX64", flags %x\n",
1552                        body->oa.o_uid, body->oa.o_gid, body->oa.o_valid,
1553                        body->oa.o_flags);
1554                 lquota_setdq(quota_interface, cli, qid, body->oa.o_valid,
1555                              body->oa.o_flags);
1556         }
1557 #endif
1558
1559         osc_update_grant(cli, body);
1560
1561         if (rc < 0)
1562                 RETURN(rc);
1563
1564         if (aa->aa_oa->o_valid & OBD_MD_FLCKSUM)
1565                 client_cksum = aa->aa_oa->o_cksum; /* save for later */
1566
1567         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE) {
1568                 if (rc > 0) {
1569                         CERROR("Unexpected +ve rc %d\n", rc);
1570                         RETURN(-EPROTO);
1571                 }
1572                 LASSERT(req->rq_bulk->bd_nob == aa->aa_requested_nob);
1573
1574                 if (sptlrpc_cli_unwrap_bulk_write(req, req->rq_bulk))
1575                         RETURN(-EAGAIN);
1576
1577                 if ((aa->aa_oa->o_valid & OBD_MD_FLCKSUM) && client_cksum &&
1578                     check_write_checksum(&body->oa, peer, client_cksum,
1579                                          body->oa.o_cksum, aa->aa_requested_nob,
1580                                          aa->aa_page_count, aa->aa_ppga,
1581                                          cksum_type_unpack(aa->aa_oa->o_flags)))
1582                         RETURN(-EAGAIN);
1583
1584                 rc = check_write_rcs(req, aa->aa_requested_nob,aa->aa_nio_count,
1585                                      aa->aa_page_count, aa->aa_ppga);
1586                 GOTO(out, rc);
1587         }
1588
1589         /* The rest of this function executes only for OST_READs */
1590
1591         /* if unwrap_bulk failed, return -EAGAIN to retry */
1592         rc = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk, rc);
1593         if (rc < 0)
1594                 GOTO(out, rc = -EAGAIN);
1595
1596         if (rc > aa->aa_requested_nob) {
1597                 CERROR("Unexpected rc %d (%d requested)\n", rc,
1598                        aa->aa_requested_nob);
1599                 RETURN(-EPROTO);
1600         }
1601
1602         if (rc != req->rq_bulk->bd_nob_transferred) {
1603                 CERROR ("Unexpected rc %d (%d transferred)\n",
1604                         rc, req->rq_bulk->bd_nob_transferred);
1605                 return (-EPROTO);
1606         }
1607
1608         if (rc < aa->aa_requested_nob)
1609                 handle_short_read(rc, aa->aa_page_count, aa->aa_ppga);
1610
1611         if (body->oa.o_valid & OBD_MD_FLCKSUM) {
1612                 static int cksum_counter;
1613                 __u32      server_cksum = body->oa.o_cksum;
1614                 char      *via;
1615                 char      *router;
1616                 cksum_type_t cksum_type;
1617
1618                 if (body->oa.o_valid & OBD_MD_FLFLAGS)
1619                         cksum_type = cksum_type_unpack(body->oa.o_flags);
1620                 else
1621                         cksum_type = OBD_CKSUM_CRC32;
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         CFS_LIST_HEAD(tmp_list);
2438         unsigned int ending_offset;
2439         unsigned  starting_offset = 0;
2440         int srvlock = 0, mem_tight = 0;
2441         struct cl_object *clob = NULL;
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, &tmp_list);
2450                 else
2451                         cfs_list_move_tail(&oap->oap_pending_item, &tmp_list);
2452                 if (++page_count >= cli->cl_max_pages_per_rpc)
2453                         break;
2454         }
2455
2456         cfs_list_splice(&tmp_list, &lop->lop_pending);
2457         page_count = 0;
2458
2459         /* first we find the pages we're allowed to work with */
2460         cfs_list_for_each_entry_safe(oap, tmp, &lop->lop_pending,
2461                                      oap_pending_item) {
2462                 ops = oap->oap_caller_ops;
2463
2464                 LASSERTF(oap->oap_magic == OAP_MAGIC, "Bad oap magic: oap %p, "
2465                          "magic 0x%x\n", oap, oap->oap_magic);
2466
2467                 if (clob == NULL) {
2468                         /* pin object in memory, so that completion call-backs
2469                          * can be safely called under client_obd_list lock. */
2470                         clob = osc_oap2cl_page(oap)->cp_obj;
2471                         cl_object_get(clob);
2472                 }
2473
2474                 if (page_count != 0 &&
2475                     srvlock != !!(oap->oap_brw_flags & OBD_BRW_SRVLOCK)) {
2476                         CDEBUG(D_PAGE, "SRVLOCK flag mismatch,"
2477                                " oap %p, page %p, srvlock %u\n",
2478                                oap, oap->oap_brw_page.pg, (unsigned)!srvlock);
2479                         break;
2480                 }
2481
2482                 /* If there is a gap at the start of this page, it can't merge
2483                  * with any previous page, so we'll hand the network a
2484                  * "fragmented" page array that it can't transfer in 1 RDMA */
2485                 if (page_count != 0 && oap->oap_page_off != 0)
2486                         break;
2487
2488                 /* in llite being 'ready' equates to the page being locked
2489                  * until completion unlocks it.  commit_write submits a page
2490                  * as not ready because its unlock will happen unconditionally
2491                  * as the call returns.  if we race with commit_write giving
2492                  * us that page we don't want to create a hole in the page
2493                  * stream, so we stop and leave the rpc to be fired by
2494                  * another dirtier or kupdated interval (the not ready page
2495                  * will still be on the dirty list).  we could call in
2496                  * at the end of ll_file_write to process the queue again. */
2497                 if (!(oap->oap_async_flags & ASYNC_READY)) {
2498                         int rc = ops->ap_make_ready(env, oap->oap_caller_data,
2499                                                     cmd);
2500                         if (rc < 0)
2501                                 CDEBUG(D_INODE, "oap %p page %p returned %d "
2502                                                 "instead of ready\n", oap,
2503                                                 oap->oap_page, rc);
2504                         switch (rc) {
2505                         case -EAGAIN:
2506                                 /* llite is telling us that the page is still
2507                                  * in commit_write and that we should try
2508                                  * and put it in an rpc again later.  we
2509                                  * break out of the loop so we don't create
2510                                  * a hole in the sequence of pages in the rpc
2511                                  * stream.*/
2512                                 oap = NULL;
2513                                 break;
2514                         case -EINTR:
2515                                 /* the io isn't needed.. tell the checks
2516                                  * below to complete the rpc with EINTR */
2517                                 cfs_spin_lock(&oap->oap_lock);
2518                                 oap->oap_async_flags |= ASYNC_COUNT_STABLE;
2519                                 cfs_spin_unlock(&oap->oap_lock);
2520                                 oap->oap_count = -EINTR;
2521                                 break;
2522                         case 0:
2523                                 cfs_spin_lock(&oap->oap_lock);
2524                                 oap->oap_async_flags |= ASYNC_READY;
2525                                 cfs_spin_unlock(&oap->oap_lock);
2526                                 break;
2527                         default:
2528                                 LASSERTF(0, "oap %p page %p returned %d "
2529                                             "from make_ready\n", oap,
2530                                             oap->oap_page, rc);
2531                                 break;
2532                         }
2533                 }
2534                 if (oap == NULL)
2535                         break;
2536                 /*
2537                  * Page submitted for IO has to be locked. Either by
2538                  * ->ap_make_ready() or by higher layers.
2539                  */
2540 #if defined(__KERNEL__) && defined(__linux__)
2541                 {
2542                         struct cl_page *page;
2543
2544                         page = osc_oap2cl_page(oap);
2545
2546                         if (page->cp_type == CPT_CACHEABLE &&
2547                             !(PageLocked(oap->oap_page) &&
2548                               (CheckWriteback(oap->oap_page, cmd)))) {
2549                                 CDEBUG(D_PAGE, "page %p lost wb %lx/%x\n",
2550                                        oap->oap_page,
2551                                        (long)oap->oap_page->flags,
2552                                        oap->oap_async_flags);
2553                                 LBUG();
2554                         }
2555                 }
2556 #endif
2557
2558                 /* take the page out of our book-keeping */
2559                 cfs_list_del_init(&oap->oap_pending_item);
2560                 lop_update_pending(cli, lop, cmd, -1);
2561                 cfs_list_del_init(&oap->oap_urgent_item);
2562
2563                 if (page_count == 0)
2564                         starting_offset = (oap->oap_obj_off+oap->oap_page_off) &
2565                                           (PTLRPC_MAX_BRW_SIZE - 1);
2566
2567                 /* ask the caller for the size of the io as the rpc leaves. */
2568                 if (!(oap->oap_async_flags & ASYNC_COUNT_STABLE)) {
2569                         oap->oap_count =
2570                                 ops->ap_refresh_count(env, oap->oap_caller_data,
2571                                                       cmd);
2572                         LASSERT(oap->oap_page_off + oap->oap_count <= CFS_PAGE_SIZE);
2573                 }
2574                 if (oap->oap_count <= 0) {
2575                         CDEBUG(D_CACHE, "oap %p count %d, completing\n", oap,
2576                                oap->oap_count);
2577                         osc_ap_completion(env, cli, NULL,
2578                                           oap, 0, oap->oap_count);
2579                         continue;
2580                 }
2581
2582                 /* now put the page back in our accounting */
2583                 cfs_list_add_tail(&oap->oap_rpc_item, &rpc_list);
2584                 if (oap->oap_brw_flags & OBD_BRW_MEMALLOC)
2585                         mem_tight = 1;
2586                 if (page_count == 0)
2587                         srvlock = !!(oap->oap_brw_flags & OBD_BRW_SRVLOCK);
2588                 if (++page_count >= cli->cl_max_pages_per_rpc)
2589                         break;
2590
2591                 /* End on a PTLRPC_MAX_BRW_SIZE boundary.  We want full-sized
2592                  * RPCs aligned on PTLRPC_MAX_BRW_SIZE boundaries to help reads
2593                  * have the same alignment as the initial writes that allocated
2594                  * extents on the server. */
2595                 ending_offset = (oap->oap_obj_off + oap->oap_page_off +
2596                                  oap->oap_count) & (PTLRPC_MAX_BRW_SIZE - 1);
2597                 if (ending_offset == 0)
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         if (cmd == OBD_BRW_READ) {
2632                 lprocfs_oh_tally_log2(&cli->cl_read_page_hist, page_count);
2633                 lprocfs_oh_tally(&cli->cl_read_rpc_hist, cli->cl_r_in_flight);
2634                 lprocfs_oh_tally_log2(&cli->cl_read_offset_hist,
2635                                       (starting_offset >> CFS_PAGE_SHIFT) + 1);
2636         } else {
2637                 lprocfs_oh_tally_log2(&cli->cl_write_page_hist, page_count);
2638                 lprocfs_oh_tally(&cli->cl_write_rpc_hist,
2639                                  cli->cl_w_in_flight);
2640                 lprocfs_oh_tally_log2(&cli->cl_write_offset_hist,
2641                                       (starting_offset >> CFS_PAGE_SHIFT) + 1);
2642         }
2643         ptlrpc_lprocfs_brw(req, aa->aa_requested_nob);
2644
2645         client_obd_list_lock(&cli->cl_loi_list_lock);
2646
2647         if (cmd == OBD_BRW_READ)
2648                 cli->cl_r_in_flight++;
2649         else
2650                 cli->cl_w_in_flight++;
2651
2652         /* queued sync pages can be torn down while the pages
2653          * were between the pending list and the rpc */
2654         tmp = NULL;
2655         cfs_list_for_each_entry(oap, &aa->aa_oaps, oap_rpc_item) {
2656                 /* only one oap gets a request reference */
2657                 if (tmp == NULL)
2658                         tmp = oap;
2659                 if (oap->oap_interrupted && !req->rq_intr) {
2660                         CDEBUG(D_INODE, "oap %p in req %p interrupted\n",
2661                                oap, req);
2662                         ptlrpc_mark_interrupted(req);
2663                 }
2664         }
2665         if (tmp != NULL)
2666                 tmp->oap_request = ptlrpc_request_addref(req);
2667
2668         DEBUG_REQ(D_INODE, req, "%d pages, aa %p. now %dr/%dw in flight",
2669                   page_count, aa, cli->cl_r_in_flight, cli->cl_w_in_flight);
2670
2671         req->rq_interpret_reply = brw_interpret;
2672         ptlrpcd_add_req(req, PSCOPE_BRW);
2673         RETURN(1);
2674 }
2675
2676 #define LOI_DEBUG(LOI, STR, args...)                                     \
2677         CDEBUG(D_INODE, "loi ready %d wr %d:%d rd %d:%d " STR,           \
2678                !cfs_list_empty(&(LOI)->loi_ready_item) ||                \
2679                !cfs_list_empty(&(LOI)->loi_hp_ready_item),               \
2680                (LOI)->loi_write_lop.lop_num_pending,                     \
2681                !cfs_list_empty(&(LOI)->loi_write_lop.lop_urgent),        \
2682                (LOI)->loi_read_lop.lop_num_pending,                      \
2683                !cfs_list_empty(&(LOI)->loi_read_lop.lop_urgent),         \
2684                args)                                                     \
2685
2686 /* This is called by osc_check_rpcs() to find which objects have pages that
2687  * we could be sending.  These lists are maintained by lop_makes_rpc(). */
2688 struct lov_oinfo *osc_next_loi(struct client_obd *cli)
2689 {
2690         ENTRY;
2691
2692         /* First return objects that have blocked locks so that they
2693          * will be flushed quickly and other clients can get the lock,
2694          * then objects which have pages ready to be stuffed into RPCs */
2695         if (!cfs_list_empty(&cli->cl_loi_hp_ready_list))
2696                 RETURN(cfs_list_entry(cli->cl_loi_hp_ready_list.next,
2697                                       struct lov_oinfo, loi_hp_ready_item));
2698         if (!cfs_list_empty(&cli->cl_loi_ready_list))
2699                 RETURN(cfs_list_entry(cli->cl_loi_ready_list.next,
2700                                       struct lov_oinfo, loi_ready_item));
2701
2702         /* then if we have cache waiters, return all objects with queued
2703          * writes.  This is especially important when many small files
2704          * have filled up the cache and not been fired into rpcs because
2705          * they don't pass the nr_pending/object threshhold */
2706         if (!cfs_list_empty(&cli->cl_cache_waiters) &&
2707             !cfs_list_empty(&cli->cl_loi_write_list))
2708                 RETURN(cfs_list_entry(cli->cl_loi_write_list.next,
2709                                       struct lov_oinfo, loi_write_item));
2710
2711         /* then return all queued objects when we have an invalid import
2712          * so that they get flushed */
2713         if (cli->cl_import == NULL || cli->cl_import->imp_invalid) {
2714                 if (!cfs_list_empty(&cli->cl_loi_write_list))
2715                         RETURN(cfs_list_entry(cli->cl_loi_write_list.next,
2716                                               struct lov_oinfo,
2717                                               loi_write_item));
2718                 if (!cfs_list_empty(&cli->cl_loi_read_list))
2719                         RETURN(cfs_list_entry(cli->cl_loi_read_list.next,
2720                                               struct lov_oinfo, loi_read_item));
2721         }
2722         RETURN(NULL);
2723 }
2724
2725 static int osc_max_rpc_in_flight(struct client_obd *cli, struct lov_oinfo *loi)
2726 {
2727         struct osc_async_page *oap;
2728         int hprpc = 0;
2729
2730         if (!cfs_list_empty(&loi->loi_write_lop.lop_urgent)) {
2731                 oap = cfs_list_entry(loi->loi_write_lop.lop_urgent.next,
2732                                      struct osc_async_page, oap_urgent_item);
2733                 hprpc = !!(oap->oap_async_flags & ASYNC_HP);
2734         }
2735
2736         if (!hprpc && !cfs_list_empty(&loi->loi_read_lop.lop_urgent)) {
2737                 oap = cfs_list_entry(loi->loi_read_lop.lop_urgent.next,
2738                                      struct osc_async_page, oap_urgent_item);
2739                 hprpc = !!(oap->oap_async_flags & ASYNC_HP);
2740         }
2741
2742         return rpcs_in_flight(cli) >= cli->cl_max_rpcs_in_flight + hprpc;
2743 }
2744
2745 /* called with the loi list lock held */
2746 void osc_check_rpcs(const struct lu_env *env, struct client_obd *cli)
2747 {
2748         struct lov_oinfo *loi;
2749         int rc = 0, race_counter = 0;
2750         ENTRY;
2751
2752         while ((loi = osc_next_loi(cli)) != NULL) {
2753                 LOI_DEBUG(loi, "%lu in flight\n", rpcs_in_flight(cli));
2754
2755                 if (osc_max_rpc_in_flight(cli, loi))
2756                         break;
2757
2758                 /* attempt some read/write balancing by alternating between
2759                  * reads and writes in an object.  The makes_rpc checks here
2760                  * would be redundant if we were getting read/write work items
2761                  * instead of objects.  we don't want send_oap_rpc to drain a
2762                  * partial read pending queue when we're given this object to
2763                  * do io on writes while there are cache waiters */
2764                 if (lop_makes_rpc(cli, &loi->loi_write_lop, OBD_BRW_WRITE)) {
2765                         rc = osc_send_oap_rpc(env, cli, loi, OBD_BRW_WRITE,
2766                                               &loi->loi_write_lop);
2767                         if (rc < 0) {
2768                                 CERROR("Write request failed with %d\n", rc);
2769
2770                                 /* osc_send_oap_rpc failed, mostly because of
2771                                  * memory pressure.
2772                                  *
2773                                  * It can't break here, because if:
2774                                  *  - a page was submitted by osc_io_submit, so
2775                                  *    page locked;
2776                                  *  - no request in flight
2777                                  *  - no subsequent request
2778                                  * The system will be in live-lock state,
2779                                  * because there is no chance to call
2780                                  * osc_io_unplug() and osc_check_rpcs() any
2781                                  * more. pdflush can't help in this case,
2782                                  * because it might be blocked at grabbing
2783                                  * the page lock as we mentioned.
2784                                  *
2785                                  * Anyway, continue to drain pages. */
2786                                 /* break; */
2787                         }
2788
2789                         if (rc > 0)
2790                                 race_counter = 0;
2791                         else
2792                                 race_counter++;
2793                 }
2794                 if (lop_makes_rpc(cli, &loi->loi_read_lop, OBD_BRW_READ)) {
2795                         rc = osc_send_oap_rpc(env, cli, loi, OBD_BRW_READ,
2796                                               &loi->loi_read_lop);
2797                         if (rc < 0)
2798                                 CERROR("Read request failed with %d\n", rc);
2799
2800                         if (rc > 0)
2801                                 race_counter = 0;
2802                         else
2803                                 race_counter++;
2804                 }
2805
2806                 /* attempt some inter-object balancing by issuing rpcs
2807                  * for each object in turn */
2808                 if (!cfs_list_empty(&loi->loi_hp_ready_item))
2809                         cfs_list_del_init(&loi->loi_hp_ready_item);
2810                 if (!cfs_list_empty(&loi->loi_ready_item))
2811                         cfs_list_del_init(&loi->loi_ready_item);
2812                 if (!cfs_list_empty(&loi->loi_write_item))
2813                         cfs_list_del_init(&loi->loi_write_item);
2814                 if (!cfs_list_empty(&loi->loi_read_item))
2815                         cfs_list_del_init(&loi->loi_read_item);
2816
2817                 loi_list_maint(cli, loi);
2818
2819                 /* send_oap_rpc fails with 0 when make_ready tells it to
2820                  * back off.  llite's make_ready does this when it tries
2821                  * to lock a page queued for write that is already locked.
2822                  * we want to try sending rpcs from many objects, but we
2823                  * don't want to spin failing with 0.  */
2824                 if (race_counter == 10)
2825                         break;
2826         }
2827         EXIT;
2828 }
2829
2830 /* we're trying to queue a page in the osc so we're subject to the
2831  * 'cl_dirty_max' limit on the number of pages that can be queued in the osc.
2832  * If the osc's queued pages are already at that limit, then we want to sleep
2833  * until there is space in the osc's queue for us.  We also may be waiting for
2834  * write credits from the OST if there are RPCs in flight that may return some
2835  * before we fall back to sync writes.
2836  *
2837  * We need this know our allocation was granted in the presence of signals */
2838 static int ocw_granted(struct client_obd *cli, struct osc_cache_waiter *ocw)
2839 {
2840         int rc;
2841         ENTRY;
2842         client_obd_list_lock(&cli->cl_loi_list_lock);
2843         rc = cfs_list_empty(&ocw->ocw_entry) || rpcs_in_flight(cli) == 0;
2844         client_obd_list_unlock(&cli->cl_loi_list_lock);
2845         RETURN(rc);
2846 };
2847
2848 /**
2849  * Non-blocking version of osc_enter_cache() that consumes grant only when it
2850  * is available.
2851  */
2852 int osc_enter_cache_try(const struct lu_env *env,
2853                         struct client_obd *cli, struct lov_oinfo *loi,
2854                         struct osc_async_page *oap, int transient)
2855 {
2856         int has_grant;
2857
2858         has_grant = cli->cl_avail_grant >= CFS_PAGE_SIZE;
2859         if (has_grant) {
2860                 osc_consume_write_grant(cli, &oap->oap_brw_page);
2861                 if (transient) {
2862                         cli->cl_dirty_transit += CFS_PAGE_SIZE;
2863                         cfs_atomic_inc(&obd_dirty_transit_pages);
2864                         oap->oap_brw_flags |= OBD_BRW_NOCACHE;
2865                 }
2866         }
2867         return has_grant;
2868 }
2869
2870 /* Caller must hold loi_list_lock - we drop/regain it if we need to wait for
2871  * grant or cache space. */
2872 static int osc_enter_cache(const struct lu_env *env,
2873                            struct client_obd *cli, struct lov_oinfo *loi,
2874                            struct osc_async_page *oap)
2875 {
2876         struct osc_cache_waiter ocw;
2877         struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
2878
2879         ENTRY;
2880
2881         CDEBUG(D_CACHE, "dirty: %ld/%d dirty_max: %ld/%d dropped: %lu "
2882                "grant: %lu\n", cli->cl_dirty, cfs_atomic_read(&obd_dirty_pages),
2883                cli->cl_dirty_max, obd_max_dirty_pages,
2884                cli->cl_lost_grant, cli->cl_avail_grant);
2885
2886         /* force the caller to try sync io.  this can jump the list
2887          * of queued writes and create a discontiguous rpc stream */
2888         if (cli->cl_dirty_max < CFS_PAGE_SIZE || cli->cl_ar.ar_force_sync ||
2889             loi->loi_ar.ar_force_sync)
2890                 RETURN(-EDQUOT);
2891
2892         /* Hopefully normal case - cache space and write credits available */
2893         if (cli->cl_dirty + CFS_PAGE_SIZE <= cli->cl_dirty_max &&
2894             cfs_atomic_read(&obd_dirty_pages) + 1 <= obd_max_dirty_pages &&
2895             osc_enter_cache_try(env, cli, loi, oap, 0))
2896                 RETURN(0);
2897
2898         /* It is safe to block as a cache waiter as long as there is grant
2899          * space available or the hope of additional grant being returned
2900          * when an in flight write completes.  Using the write back cache
2901          * if possible is preferable to sending the data synchronously
2902          * because write pages can then be merged in to large requests.
2903          * The addition of this cache waiter will causing pending write
2904          * pages to be sent immediately. */
2905         if (cli->cl_w_in_flight || cli->cl_avail_grant >= CFS_PAGE_SIZE) {
2906                 cfs_list_add_tail(&ocw.ocw_entry, &cli->cl_cache_waiters);
2907                 cfs_waitq_init(&ocw.ocw_waitq);
2908                 ocw.ocw_oap = oap;
2909                 ocw.ocw_rc = 0;
2910
2911                 loi_list_maint(cli, loi);
2912                 osc_check_rpcs(env, cli);
2913                 client_obd_list_unlock(&cli->cl_loi_list_lock);
2914
2915                 CDEBUG(D_CACHE, "sleeping for cache space\n");
2916                 l_wait_event(ocw.ocw_waitq, ocw_granted(cli, &ocw), &lwi);
2917
2918                 client_obd_list_lock(&cli->cl_loi_list_lock);
2919                 if (!cfs_list_empty(&ocw.ocw_entry)) {
2920                         cfs_list_del(&ocw.ocw_entry);
2921                         RETURN(-EINTR);
2922                 }
2923                 RETURN(ocw.ocw_rc);
2924         }
2925
2926         RETURN(-EDQUOT);
2927 }
2928
2929
2930 int osc_prep_async_page(struct obd_export *exp, struct lov_stripe_md *lsm,
2931                         struct lov_oinfo *loi, cfs_page_t *page,
2932                         obd_off offset, const struct obd_async_page_ops *ops,
2933                         void *data, void **res, int nocache,
2934                         struct lustre_handle *lockh)
2935 {
2936         struct osc_async_page *oap;
2937
2938         ENTRY;
2939
2940         if (!page)
2941                 return cfs_size_round(sizeof(*oap));
2942
2943         oap = *res;
2944         oap->oap_magic = OAP_MAGIC;
2945         oap->oap_cli = &exp->exp_obd->u.cli;
2946         oap->oap_loi = loi;
2947
2948         oap->oap_caller_ops = ops;
2949         oap->oap_caller_data = data;
2950
2951         oap->oap_page = page;
2952         oap->oap_obj_off = offset;
2953         if (!client_is_remote(exp) &&
2954             cfs_capable(CFS_CAP_SYS_RESOURCE))
2955                 oap->oap_brw_flags = OBD_BRW_NOQUOTA;
2956
2957         LASSERT(!(offset & ~CFS_PAGE_MASK));
2958
2959         CFS_INIT_LIST_HEAD(&oap->oap_pending_item);
2960         CFS_INIT_LIST_HEAD(&oap->oap_urgent_item);
2961         CFS_INIT_LIST_HEAD(&oap->oap_rpc_item);
2962         CFS_INIT_LIST_HEAD(&oap->oap_page_list);
2963
2964         cfs_spin_lock_init(&oap->oap_lock);
2965         CDEBUG(D_CACHE, "oap %p page %p obj off "LPU64"\n", oap, page, offset);
2966         RETURN(0);
2967 }
2968
2969 int osc_queue_async_io(const struct lu_env *env, struct obd_export *exp,
2970                        struct lov_stripe_md *lsm, struct lov_oinfo *loi,
2971                        struct osc_async_page *oap, int cmd, obd_off off,
2972                        int count, obd_flag brw_flags,
2973                        enum async_flags async_flags)
2974 {
2975         struct client_obd *cli = &exp->exp_obd->u.cli;
2976         int rc = 0;
2977         ENTRY;
2978
2979         if (oap->oap_magic != OAP_MAGIC)
2980                 RETURN(-EINVAL);
2981
2982         if (cli->cl_import == NULL || cli->cl_import->imp_invalid)
2983                 RETURN(-EIO);
2984
2985         if (!cfs_list_empty(&oap->oap_pending_item) ||
2986             !cfs_list_empty(&oap->oap_urgent_item) ||
2987             !cfs_list_empty(&oap->oap_rpc_item))
2988                 RETURN(-EBUSY);
2989
2990         /* check if the file's owner/group is over quota */
2991         if ((cmd & OBD_BRW_WRITE) && !(cmd & OBD_BRW_NOQUOTA)) {
2992                 struct cl_object *obj;
2993                 struct cl_attr    attr; /* XXX put attr into thread info */
2994                 unsigned int qid[MAXQUOTAS];
2995
2996                 obj = cl_object_top(osc_oap2cl_page(oap)->cp_obj);
2997
2998                 cl_object_attr_lock(obj);
2999                 rc = cl_object_attr_get(env, obj, &attr);
3000                 cl_object_attr_unlock(obj);
3001
3002                 qid[USRQUOTA] = attr.cat_uid;
3003                 qid[GRPQUOTA] = attr.cat_gid;
3004                 if (rc == 0 &&
3005                     lquota_chkdq(quota_interface, cli, qid) == NO_QUOTA)
3006                         rc = -EDQUOT;
3007                 if (rc)
3008                         RETURN(rc);
3009         }
3010
3011         if (loi == NULL)
3012                 loi = lsm->lsm_oinfo[0];
3013
3014         client_obd_list_lock(&cli->cl_loi_list_lock);
3015
3016         LASSERT(off + count <= CFS_PAGE_SIZE);
3017         oap->oap_cmd = cmd;
3018         oap->oap_page_off = off;
3019         oap->oap_count = count;
3020         oap->oap_brw_flags = brw_flags;
3021         /* Give a hint to OST that requests are coming from kswapd - bug19529 */
3022         if (cfs_memory_pressure_get())
3023                 oap->oap_brw_flags |= OBD_BRW_MEMALLOC;
3024         cfs_spin_lock(&oap->oap_lock);
3025         oap->oap_async_flags = async_flags;
3026         cfs_spin_unlock(&oap->oap_lock);
3027
3028         if (cmd & OBD_BRW_WRITE) {
3029                 rc = osc_enter_cache(env, cli, loi, oap);
3030                 if (rc) {
3031                         client_obd_list_unlock(&cli->cl_loi_list_lock);
3032                         RETURN(rc);
3033                 }
3034         }
3035
3036         osc_oap_to_pending(oap);
3037         loi_list_maint(cli, loi);
3038
3039         LOI_DEBUG(loi, "oap %p page %p added for cmd %d\n", oap, oap->oap_page,
3040                   cmd);
3041
3042         osc_check_rpcs(env, cli);
3043         client_obd_list_unlock(&cli->cl_loi_list_lock);
3044
3045         RETURN(0);
3046 }
3047
3048 /* aka (~was & now & flag), but this is more clear :) */
3049 #define SETTING(was, now, flag) (!(was & flag) && (now & flag))
3050
3051 int osc_set_async_flags_base(struct client_obd *cli,
3052                              struct lov_oinfo *loi, struct osc_async_page *oap,
3053                              obd_flag async_flags)
3054 {
3055         struct loi_oap_pages *lop;
3056         int flags = 0;
3057         ENTRY;
3058
3059         LASSERT(!cfs_list_empty(&oap->oap_pending_item));
3060
3061         if (oap->oap_cmd & OBD_BRW_WRITE) {
3062                 lop = &loi->loi_write_lop;
3063         } else {
3064                 lop = &loi->loi_read_lop;
3065         }
3066
3067         if ((oap->oap_async_flags & async_flags) == async_flags)
3068                 RETURN(0);
3069
3070         if (SETTING(oap->oap_async_flags, async_flags, ASYNC_READY))
3071                 flags |= ASYNC_READY;
3072
3073         if (SETTING(oap->oap_async_flags, async_flags, ASYNC_URGENT) &&
3074             cfs_list_empty(&oap->oap_rpc_item)) {
3075                 if (oap->oap_async_flags & ASYNC_HP)
3076                         cfs_list_add(&oap->oap_urgent_item, &lop->lop_urgent);
3077                 else
3078                         cfs_list_add_tail(&oap->oap_urgent_item,
3079                                           &lop->lop_urgent);
3080                 flags |= ASYNC_URGENT;
3081                 loi_list_maint(cli, loi);
3082         }
3083         cfs_spin_lock(&oap->oap_lock);
3084         oap->oap_async_flags |= flags;
3085         cfs_spin_unlock(&oap->oap_lock);
3086
3087         LOI_DEBUG(loi, "oap %p page %p has flags %x\n", oap, oap->oap_page,
3088                         oap->oap_async_flags);
3089         RETURN(0);
3090 }
3091
3092 int osc_teardown_async_page(struct obd_export *exp, struct lov_stripe_md *lsm,
3093                             struct lov_oinfo *loi, struct osc_async_page *oap)
3094 {
3095         struct client_obd *cli = &exp->exp_obd->u.cli;
3096         struct loi_oap_pages *lop;
3097         int rc = 0;
3098         ENTRY;
3099
3100         if (oap->oap_magic != OAP_MAGIC)
3101                 RETURN(-EINVAL);
3102
3103         if (loi == NULL)
3104                 loi = lsm->lsm_oinfo[0];
3105
3106         if (oap->oap_cmd & OBD_BRW_WRITE) {
3107                 lop = &loi->loi_write_lop;
3108         } else {
3109                 lop = &loi->loi_read_lop;
3110         }
3111
3112         client_obd_list_lock(&cli->cl_loi_list_lock);
3113
3114         if (!cfs_list_empty(&oap->oap_rpc_item))
3115                 GOTO(out, rc = -EBUSY);
3116
3117         osc_exit_cache(cli, oap, 0);
3118         osc_wake_cache_waiters(cli);
3119
3120         if (!cfs_list_empty(&oap->oap_urgent_item)) {
3121                 cfs_list_del_init(&oap->oap_urgent_item);
3122                 cfs_spin_lock(&oap->oap_lock);
3123                 oap->oap_async_flags &= ~(ASYNC_URGENT | ASYNC_HP);
3124                 cfs_spin_unlock(&oap->oap_lock);
3125         }
3126         if (!cfs_list_empty(&oap->oap_pending_item)) {
3127                 cfs_list_del_init(&oap->oap_pending_item);
3128                 lop_update_pending(cli, lop, oap->oap_cmd, -1);
3129         }
3130         loi_list_maint(cli, loi);
3131         LOI_DEBUG(loi, "oap %p page %p torn down\n", oap, oap->oap_page);
3132 out:
3133         client_obd_list_unlock(&cli->cl_loi_list_lock);
3134         RETURN(rc);
3135 }
3136
3137 static int osc_set_lock_data_with_check(struct ldlm_lock *lock,
3138                                         struct ldlm_enqueue_info *einfo)
3139 {
3140         void *data = einfo->ei_cbdata;
3141         int set = 0;
3142
3143         LASSERT(lock != NULL);
3144         LASSERT(lock->l_blocking_ast == einfo->ei_cb_bl);
3145         LASSERT(lock->l_resource->lr_type == einfo->ei_type);
3146         LASSERT(lock->l_completion_ast == einfo->ei_cb_cp);
3147         LASSERT(lock->l_glimpse_ast == einfo->ei_cb_gl);
3148
3149         lock_res_and_lock(lock);
3150         cfs_spin_lock(&osc_ast_guard);
3151
3152         if (lock->l_ast_data == NULL)
3153                 lock->l_ast_data = data;
3154         if (lock->l_ast_data == data)
3155                 set = 1;
3156
3157         cfs_spin_unlock(&osc_ast_guard);
3158         unlock_res_and_lock(lock);
3159
3160         return set;
3161 }
3162
3163 static int osc_set_data_with_check(struct lustre_handle *lockh,
3164                                    struct ldlm_enqueue_info *einfo)
3165 {
3166         struct ldlm_lock *lock = ldlm_handle2lock(lockh);
3167         int set = 0;
3168
3169         if (lock != NULL) {
3170                 set = osc_set_lock_data_with_check(lock, einfo);
3171                 LDLM_LOCK_PUT(lock);
3172         } else
3173                 CERROR("lockh %p, data %p - client evicted?\n",
3174                        lockh, einfo->ei_cbdata);
3175         return set;
3176 }
3177
3178 static int osc_change_cbdata(struct obd_export *exp, struct lov_stripe_md *lsm,
3179                              ldlm_iterator_t replace, void *data)
3180 {
3181         struct ldlm_res_id res_id;
3182         struct obd_device *obd = class_exp2obd(exp);
3183
3184         osc_build_res_name(lsm->lsm_object_id, lsm->lsm_object_seq, &res_id);
3185         ldlm_resource_iterate(obd->obd_namespace, &res_id, replace, data);
3186         return 0;
3187 }
3188
3189 /* find any ldlm lock of the inode in osc
3190  * return 0    not find
3191  *        1    find one
3192  *      < 0    error */
3193 static int osc_find_cbdata(struct obd_export *exp, struct lov_stripe_md *lsm,
3194                            ldlm_iterator_t replace, void *data)
3195 {
3196         struct ldlm_res_id res_id;
3197         struct obd_device *obd = class_exp2obd(exp);
3198         int rc = 0;
3199
3200         osc_build_res_name(lsm->lsm_object_id, lsm->lsm_object_seq, &res_id);
3201         rc = ldlm_resource_iterate(obd->obd_namespace, &res_id, replace, data);
3202         if (rc == LDLM_ITER_STOP)
3203                 return(1);
3204         if (rc == LDLM_ITER_CONTINUE)
3205                 return(0);
3206         return(rc);
3207 }
3208
3209 static int osc_enqueue_fini(struct ptlrpc_request *req, struct ost_lvb *lvb,
3210                             obd_enqueue_update_f upcall, void *cookie,
3211                             int *flags, int rc)
3212 {
3213         int intent = *flags & LDLM_FL_HAS_INTENT;
3214         ENTRY;
3215
3216         if (intent) {
3217                 /* The request was created before ldlm_cli_enqueue call. */
3218                 if (rc == ELDLM_LOCK_ABORTED) {
3219                         struct ldlm_reply *rep;
3220                         rep = req_capsule_server_get(&req->rq_pill,
3221                                                      &RMF_DLM_REP);
3222
3223                         LASSERT(rep != NULL);
3224                         if (rep->lock_policy_res1)
3225                                 rc = rep->lock_policy_res1;
3226                 }
3227         }
3228
3229         if ((intent && rc == ELDLM_LOCK_ABORTED) || !rc) {
3230                 *flags |= LDLM_FL_LVB_READY;
3231                 CDEBUG(D_INODE,"got kms "LPU64" blocks "LPU64" mtime "LPU64"\n",
3232                        lvb->lvb_size, lvb->lvb_blocks, lvb->lvb_mtime);
3233         }
3234
3235         /* Call the update callback. */
3236         rc = (*upcall)(cookie, rc);
3237         RETURN(rc);
3238 }
3239
3240 static int osc_enqueue_interpret(const struct lu_env *env,
3241                                  struct ptlrpc_request *req,
3242                                  struct osc_enqueue_args *aa, int rc)
3243 {
3244         struct ldlm_lock *lock;
3245         struct lustre_handle handle;
3246         __u32 mode;
3247
3248         /* Make a local copy of a lock handle and a mode, because aa->oa_*
3249          * might be freed anytime after lock upcall has been called. */
3250         lustre_handle_copy(&handle, aa->oa_lockh);
3251         mode = aa->oa_ei->ei_mode;
3252
3253         /* ldlm_cli_enqueue is holding a reference on the lock, so it must
3254          * be valid. */
3255         lock = ldlm_handle2lock(&handle);
3256
3257         /* Take an additional reference so that a blocking AST that
3258          * ldlm_cli_enqueue_fini() might post for a failed lock, is guaranteed
3259          * to arrive after an upcall has been executed by
3260          * osc_enqueue_fini(). */
3261         ldlm_lock_addref(&handle, mode);
3262
3263         /* Let CP AST to grant the lock first. */
3264         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_ENQ_RACE, 1);
3265
3266         /* Complete obtaining the lock procedure. */
3267         rc = ldlm_cli_enqueue_fini(aa->oa_exp, req, aa->oa_ei->ei_type, 1,
3268                                    mode, aa->oa_flags, aa->oa_lvb,
3269                                    sizeof(*aa->oa_lvb), &handle, rc);
3270         /* Complete osc stuff. */
3271         rc = osc_enqueue_fini(req, aa->oa_lvb,
3272                               aa->oa_upcall, aa->oa_cookie, aa->oa_flags, rc);
3273
3274         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_CANCEL_RACE, 10);
3275
3276         /* Release the lock for async request. */
3277         if (lustre_handle_is_used(&handle) && rc == ELDLM_OK)
3278                 /*
3279                  * Releases a reference taken by ldlm_cli_enqueue(), if it is
3280                  * not already released by
3281                  * ldlm_cli_enqueue_fini()->failed_lock_cleanup()
3282                  */
3283                 ldlm_lock_decref(&handle, mode);
3284
3285         LASSERTF(lock != NULL, "lockh %p, req %p, aa %p - client evicted?\n",
3286                  aa->oa_lockh, req, aa);
3287         ldlm_lock_decref(&handle, mode);
3288         LDLM_LOCK_PUT(lock);
3289         return rc;
3290 }
3291
3292 void osc_update_enqueue(struct lustre_handle *lov_lockhp,
3293                         struct lov_oinfo *loi, int flags,
3294                         struct ost_lvb *lvb, __u32 mode, int rc)
3295 {
3296         if (rc == ELDLM_OK) {
3297                 struct ldlm_lock *lock = ldlm_handle2lock(lov_lockhp);
3298                 __u64 tmp;
3299
3300                 LASSERT(lock != NULL);
3301                 loi->loi_lvb = *lvb;
3302                 tmp = loi->loi_lvb.lvb_size;
3303                 /* Extend KMS up to the end of this lock and no further
3304                  * A lock on [x,y] means a KMS of up to y + 1 bytes! */
3305                 if (tmp > lock->l_policy_data.l_extent.end)
3306                         tmp = lock->l_policy_data.l_extent.end + 1;
3307                 if (tmp >= loi->loi_kms) {
3308                         LDLM_DEBUG(lock, "lock acquired, setting rss="LPU64
3309                                    ", kms="LPU64, loi->loi_lvb.lvb_size, tmp);
3310                         loi_kms_set(loi, tmp);
3311                 } else {
3312                         LDLM_DEBUG(lock, "lock acquired, setting rss="
3313                                    LPU64"; leaving kms="LPU64", end="LPU64,
3314                                    loi->loi_lvb.lvb_size, loi->loi_kms,
3315                                    lock->l_policy_data.l_extent.end);
3316                 }
3317                 ldlm_lock_allow_match(lock);
3318                 LDLM_LOCK_PUT(lock);
3319         } else if (rc == ELDLM_LOCK_ABORTED && (flags & LDLM_FL_HAS_INTENT)) {
3320                 loi->loi_lvb = *lvb;
3321                 CDEBUG(D_INODE, "glimpsed, setting rss="LPU64"; leaving"
3322                        " kms="LPU64"\n", loi->loi_lvb.lvb_size, loi->loi_kms);
3323                 rc = ELDLM_OK;
3324         }
3325 }
3326 EXPORT_SYMBOL(osc_update_enqueue);
3327
3328 struct ptlrpc_request_set *PTLRPCD_SET = (void *)1;
3329
3330 /* When enqueuing asynchronously, locks are not ordered, we can obtain a lock
3331  * from the 2nd OSC before a lock from the 1st one. This does not deadlock with
3332  * other synchronous requests, however keeping some locks and trying to obtain
3333  * others may take a considerable amount of time in a case of ost failure; and
3334  * when other sync requests do not get released lock from a client, the client
3335  * is excluded from the cluster -- such scenarious make the life difficult, so
3336  * release locks just after they are obtained. */
3337 int osc_enqueue_base(struct obd_export *exp, struct ldlm_res_id *res_id,
3338                      int *flags, ldlm_policy_data_t *policy,
3339                      struct ost_lvb *lvb, int kms_valid,
3340                      obd_enqueue_update_f upcall, void *cookie,
3341                      struct ldlm_enqueue_info *einfo,
3342                      struct lustre_handle *lockh,
3343                      struct ptlrpc_request_set *rqset, int async)
3344 {
3345         struct obd_device *obd = exp->exp_obd;
3346         struct ptlrpc_request *req = NULL;
3347         int intent = *flags & LDLM_FL_HAS_INTENT;
3348         ldlm_mode_t mode;
3349         int rc;
3350         ENTRY;
3351
3352         /* Filesystem lock extents are extended to page boundaries so that
3353          * dealing with the page cache is a little smoother.  */
3354         policy->l_extent.start -= policy->l_extent.start & ~CFS_PAGE_MASK;
3355         policy->l_extent.end |= ~CFS_PAGE_MASK;
3356
3357         /*
3358          * kms is not valid when either object is completely fresh (so that no
3359          * locks are cached), or object was evicted. In the latter case cached
3360          * lock cannot be used, because it would prime inode state with
3361          * potentially stale LVB.
3362          */
3363         if (!kms_valid)
3364                 goto no_match;
3365
3366         /* Next, search for already existing extent locks that will cover us */
3367         /* If we're trying to read, we also search for an existing PW lock.  The
3368          * VFS and page cache already protect us locally, so lots of readers/
3369          * writers can share a single PW lock.
3370          *
3371          * There are problems with conversion deadlocks, so instead of
3372          * converting a read lock to a write lock, we'll just enqueue a new
3373          * one.
3374          *
3375          * At some point we should cancel the read lock instead of making them
3376          * send us a blocking callback, but there are problems with canceling
3377          * locks out from other users right now, too. */
3378         mode = einfo->ei_mode;
3379         if (einfo->ei_mode == LCK_PR)
3380                 mode |= LCK_PW;
3381         mode = ldlm_lock_match(obd->obd_namespace,
3382                                *flags | LDLM_FL_LVB_READY, res_id,
3383                                einfo->ei_type, policy, mode, lockh, 0);
3384         if (mode) {
3385                 struct ldlm_lock *matched = ldlm_handle2lock(lockh);
3386
3387                 if (osc_set_lock_data_with_check(matched, einfo)) {
3388                         /* addref the lock only if not async requests and PW
3389                          * lock is matched whereas we asked for PR. */
3390                         if (!rqset && einfo->ei_mode != mode)
3391                                 ldlm_lock_addref(lockh, LCK_PR);
3392                         if (intent) {
3393                                 /* I would like to be able to ASSERT here that
3394                                  * rss <= kms, but I can't, for reasons which
3395                                  * are explained in lov_enqueue() */
3396                         }
3397
3398                         /* We already have a lock, and it's referenced */
3399                         (*upcall)(cookie, ELDLM_OK);
3400
3401                         /* For async requests, decref the lock. */
3402                         if (einfo->ei_mode != mode)
3403                                 ldlm_lock_decref(lockh, LCK_PW);
3404                         else if (rqset)
3405                                 ldlm_lock_decref(lockh, einfo->ei_mode);
3406                         LDLM_LOCK_PUT(matched);
3407                         RETURN(ELDLM_OK);
3408                 } else
3409                         ldlm_lock_decref(lockh, mode);
3410                 LDLM_LOCK_PUT(matched);
3411         }
3412
3413  no_match:
3414         if (intent) {
3415                 CFS_LIST_HEAD(cancels);
3416                 req = ptlrpc_request_alloc(class_exp2cliimp(exp),
3417                                            &RQF_LDLM_ENQUEUE_LVB);
3418                 if (req == NULL)
3419                         RETURN(-ENOMEM);
3420
3421                 rc = ldlm_prep_enqueue_req(exp, req, &cancels, 0);
3422                 if (rc) {
3423                         ptlrpc_request_free(req);
3424                         RETURN(rc);
3425                 }
3426
3427                 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
3428                                      sizeof *lvb);
3429                 ptlrpc_request_set_replen(req);
3430         }
3431
3432         /* users of osc_enqueue() can pass this flag for ldlm_lock_match() */
3433         *flags &= ~LDLM_FL_BLOCK_GRANTED;
3434
3435         rc = ldlm_cli_enqueue(exp, &req, einfo, res_id, policy, flags, lvb,
3436                               sizeof(*lvb), lockh, async);
3437         if (rqset) {
3438                 if (!rc) {
3439                         struct osc_enqueue_args *aa;
3440                         CLASSERT (sizeof(*aa) <= sizeof(req->rq_async_args));
3441                         aa = ptlrpc_req_async_args(req);
3442                         aa->oa_ei = einfo;
3443                         aa->oa_exp = exp;
3444                         aa->oa_flags  = flags;
3445                         aa->oa_upcall = upcall;
3446                         aa->oa_cookie = cookie;
3447                         aa->oa_lvb    = lvb;
3448                         aa->oa_lockh  = lockh;
3449
3450                         req->rq_interpret_reply =
3451                                 (ptlrpc_interpterer_t)osc_enqueue_interpret;
3452                         if (rqset == PTLRPCD_SET)
3453                                 ptlrpcd_add_req(req, PSCOPE_OTHER);
3454                         else
3455                                 ptlrpc_set_add_req(rqset, req);
3456                 } else if (intent) {
3457                         ptlrpc_req_finished(req);
3458                 }
3459                 RETURN(rc);
3460         }
3461
3462         rc = osc_enqueue_fini(req, lvb, upcall, cookie, flags, rc);
3463         if (intent)
3464                 ptlrpc_req_finished(req);
3465
3466         RETURN(rc);
3467 }
3468
3469 static int osc_enqueue(struct obd_export *exp, struct obd_info *oinfo,
3470                        struct ldlm_enqueue_info *einfo,
3471                        struct ptlrpc_request_set *rqset)
3472 {
3473         struct ldlm_res_id res_id;
3474         int rc;
3475         ENTRY;
3476
3477         osc_build_res_name(oinfo->oi_md->lsm_object_id,
3478                            oinfo->oi_md->lsm_object_seq, &res_id);
3479
3480         rc = osc_enqueue_base(exp, &res_id, &oinfo->oi_flags, &oinfo->oi_policy,
3481                               &oinfo->oi_md->lsm_oinfo[0]->loi_lvb,
3482                               oinfo->oi_md->lsm_oinfo[0]->loi_kms_valid,
3483                               oinfo->oi_cb_up, oinfo, einfo, oinfo->oi_lockh,
3484                               rqset, rqset != NULL);
3485         RETURN(rc);
3486 }
3487
3488 int osc_match_base(struct obd_export *exp, struct ldlm_res_id *res_id,
3489                    __u32 type, ldlm_policy_data_t *policy, __u32 mode,
3490                    int *flags, void *data, struct lustre_handle *lockh,
3491                    int unref)
3492 {
3493         struct obd_device *obd = exp->exp_obd;
3494         int lflags = *flags;
3495         ldlm_mode_t rc;
3496         ENTRY;
3497
3498         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_MATCH))
3499                 RETURN(-EIO);
3500
3501         /* Filesystem lock extents are extended to page boundaries so that
3502          * dealing with the page cache is a little smoother */
3503         policy->l_extent.start -= policy->l_extent.start & ~CFS_PAGE_MASK;
3504         policy->l_extent.end |= ~CFS_PAGE_MASK;
3505
3506         /* Next, search for already existing extent locks that will cover us */
3507         /* If we're trying to read, we also search for an existing PW lock.  The
3508          * VFS and page cache already protect us locally, so lots of readers/
3509          * writers can share a single PW lock. */
3510         rc = mode;
3511         if (mode == LCK_PR)
3512                 rc |= LCK_PW;
3513         rc = ldlm_lock_match(obd->obd_namespace, lflags,
3514                              res_id, type, policy, rc, lockh, unref);
3515         if (rc) {
3516                 if (data != NULL) {
3517                         if (!osc_set_data_with_check(lockh, data)) {
3518                                 if (!(lflags & LDLM_FL_TEST_LOCK))
3519                                         ldlm_lock_decref(lockh, rc);
3520                                 RETURN(0);
3521                         }
3522                 }
3523                 if (!(lflags & LDLM_FL_TEST_LOCK) && mode != rc) {
3524                         ldlm_lock_addref(lockh, LCK_PR);
3525                         ldlm_lock_decref(lockh, LCK_PW);
3526                 }
3527                 RETURN(rc);
3528         }
3529         RETURN(rc);
3530 }
3531
3532 int osc_cancel_base(struct lustre_handle *lockh, __u32 mode)
3533 {
3534         ENTRY;
3535
3536         if (unlikely(mode == LCK_GROUP))
3537                 ldlm_lock_decref_and_cancel(lockh, mode);
3538         else
3539                 ldlm_lock_decref(lockh, mode);
3540
3541         RETURN(0);
3542 }
3543
3544 static int osc_cancel(struct obd_export *exp, struct lov_stripe_md *md,
3545                       __u32 mode, struct lustre_handle *lockh)
3546 {
3547         ENTRY;
3548         RETURN(osc_cancel_base(lockh, mode));
3549 }
3550
3551 static int osc_cancel_unused(struct obd_export *exp,
3552                              struct lov_stripe_md *lsm,
3553                              ldlm_cancel_flags_t flags,
3554                              void *opaque)
3555 {
3556         struct obd_device *obd = class_exp2obd(exp);
3557         struct ldlm_res_id res_id, *resp = NULL;
3558
3559         if (lsm != NULL) {
3560                 resp = osc_build_res_name(lsm->lsm_object_id,
3561                                           lsm->lsm_object_seq, &res_id);
3562         }
3563
3564         return ldlm_cli_cancel_unused(obd->obd_namespace, resp, flags, opaque);
3565 }
3566
3567 static int osc_statfs_interpret(const struct lu_env *env,
3568                                 struct ptlrpc_request *req,
3569                                 struct osc_async_args *aa, int rc)
3570 {
3571         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
3572         struct obd_statfs *msfs;
3573         __u64 used;
3574         ENTRY;
3575
3576         if (rc == -EBADR)
3577                 /* The request has in fact never been sent
3578                  * due to issues at a higher level (LOV).
3579                  * Exit immediately since the caller is
3580                  * aware of the problem and takes care
3581                  * of the clean up */
3582                  RETURN(rc);
3583
3584         if ((rc == -ENOTCONN || rc == -EAGAIN) &&
3585             (aa->aa_oi->oi_flags & OBD_STATFS_NODELAY))
3586                 GOTO(out, rc = 0);
3587
3588         if (rc != 0)
3589                 GOTO(out, rc);
3590
3591         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
3592         if (msfs == NULL) {
3593                 GOTO(out, rc = -EPROTO);
3594         }
3595
3596         /* Reinitialize the RDONLY and DEGRADED flags at the client
3597          * on each statfs, so they don't stay set permanently. */
3598         cfs_spin_lock(&cli->cl_oscc.oscc_lock);
3599
3600         if (unlikely(msfs->os_state & OS_STATE_DEGRADED))
3601                 cli->cl_oscc.oscc_flags |= OSCC_FLAG_DEGRADED;
3602         else if (unlikely(cli->cl_oscc.oscc_flags & OSCC_FLAG_DEGRADED))
3603                 cli->cl_oscc.oscc_flags &= ~OSCC_FLAG_DEGRADED;
3604
3605         if (unlikely(msfs->os_state & OS_STATE_READONLY))
3606                 cli->cl_oscc.oscc_flags |= OSCC_FLAG_RDONLY;
3607         else if (unlikely(cli->cl_oscc.oscc_flags & OSCC_FLAG_RDONLY))
3608                 cli->cl_oscc.oscc_flags &= ~OSCC_FLAG_RDONLY;
3609
3610         /* Add a bit of hysteresis so this flag isn't continually flapping,
3611          * and ensure that new files don't get extremely fragmented due to
3612          * only a small amount of available space in the filesystem.
3613          * We want to set the NOSPC flag when there is less than ~0.1% free
3614          * and clear it when there is at least ~0.2% free space, so:
3615          *                   avail < ~0.1% max          max = avail + used
3616          *            1025 * avail < avail + used       used = blocks - free
3617          *            1024 * avail < used
3618          *            1024 * avail < blocks - free
3619          *                   avail < ((blocks - free) >> 10)
3620          *
3621          * On very large disk, say 16TB 0.1% will be 16 GB. We don't want to
3622          * lose that amount of space so in those cases we report no space left
3623          * if their is less than 1 GB left.                             */
3624         used = min_t(__u64,(msfs->os_blocks - msfs->os_bfree) >> 10, 1 << 30);
3625         if (unlikely(((cli->cl_oscc.oscc_flags & OSCC_FLAG_NOSPC) == 0) &&
3626                      ((msfs->os_ffree < 32) || (msfs->os_bavail < used))))
3627                 cli->cl_oscc.oscc_flags |= OSCC_FLAG_NOSPC;
3628         else if (unlikely(((cli->cl_oscc.oscc_flags & OSCC_FLAG_NOSPC) != 0) &&
3629                 (msfs->os_ffree > 64) && (msfs->os_bavail > (used << 1))))
3630                         cli->cl_oscc.oscc_flags &= ~OSCC_FLAG_NOSPC;
3631
3632         cfs_spin_unlock(&cli->cl_oscc.oscc_lock);
3633
3634         *aa->aa_oi->oi_osfs = *msfs;
3635 out:
3636         rc = aa->aa_oi->oi_cb_up(aa->aa_oi, rc);
3637         RETURN(rc);
3638 }
3639
3640 static int osc_statfs_async(struct obd_device *obd, struct obd_info *oinfo,
3641                             __u64 max_age, struct ptlrpc_request_set *rqset)
3642 {
3643         struct ptlrpc_request *req;
3644         struct osc_async_args *aa;
3645         int                    rc;
3646         ENTRY;
3647
3648         /* We could possibly pass max_age in the request (as an absolute
3649          * timestamp or a "seconds.usec ago") so the target can avoid doing
3650          * extra calls into the filesystem if that isn't necessary (e.g.
3651          * during mount that would help a bit).  Having relative timestamps
3652          * is not so great if request processing is slow, while absolute
3653          * timestamps are not ideal because they need time synchronization. */
3654         req = ptlrpc_request_alloc(obd->u.cli.cl_import, &RQF_OST_STATFS);
3655         if (req == NULL)
3656                 RETURN(-ENOMEM);
3657
3658         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_STATFS);
3659         if (rc) {
3660                 ptlrpc_request_free(req);
3661                 RETURN(rc);
3662         }
3663         ptlrpc_request_set_replen(req);
3664         req->rq_request_portal = OST_CREATE_PORTAL;
3665         ptlrpc_at_set_req_timeout(req);
3666
3667         if (oinfo->oi_flags & OBD_STATFS_NODELAY) {
3668                 /* procfs requests not want stat in wait for avoid deadlock */
3669                 req->rq_no_resend = 1;
3670                 req->rq_no_delay = 1;
3671         }
3672
3673         req->rq_interpret_reply = (ptlrpc_interpterer_t)osc_statfs_interpret;
3674         CLASSERT (sizeof(*aa) <= sizeof(req->rq_async_args));
3675         aa = ptlrpc_req_async_args(req);
3676         aa->aa_oi = oinfo;
3677
3678         ptlrpc_set_add_req(rqset, req);
3679         RETURN(0);
3680 }
3681
3682 static int osc_statfs(struct obd_device *obd, struct obd_statfs *osfs,
3683                       __u64 max_age, __u32 flags)
3684 {
3685         struct obd_statfs     *msfs;
3686         struct ptlrpc_request *req;
3687         struct obd_import     *imp = NULL;
3688         int rc;
3689         ENTRY;
3690
3691         /*Since the request might also come from lprocfs, so we need
3692          *sync this with client_disconnect_export Bug15684*/
3693         cfs_down_read(&obd->u.cli.cl_sem);
3694         if (obd->u.cli.cl_import)
3695                 imp = class_import_get(obd->u.cli.cl_import);
3696         cfs_up_read(&obd->u.cli.cl_sem);
3697         if (!imp)
3698                 RETURN(-ENODEV);
3699
3700         /* We could possibly pass max_age in the request (as an absolute
3701          * timestamp or a "seconds.usec ago") so the target can avoid doing
3702          * extra calls into the filesystem if that isn't necessary (e.g.
3703          * during mount that would help a bit).  Having relative timestamps
3704          * is not so great if request processing is slow, while absolute
3705          * timestamps are not ideal because they need time synchronization. */
3706         req = ptlrpc_request_alloc(imp, &RQF_OST_STATFS);
3707
3708         class_import_put(imp);
3709
3710         if (req == NULL)
3711                 RETURN(-ENOMEM);
3712
3713         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_STATFS);
3714         if (rc) {
3715                 ptlrpc_request_free(req);
3716                 RETURN(rc);
3717         }
3718         ptlrpc_request_set_replen(req);
3719         req->rq_request_portal = OST_CREATE_PORTAL;
3720         ptlrpc_at_set_req_timeout(req);
3721
3722         if (flags & OBD_STATFS_NODELAY) {
3723                 /* procfs requests not want stat in wait for avoid deadlock */
3724                 req->rq_no_resend = 1;
3725                 req->rq_no_delay = 1;
3726         }
3727
3728         rc = ptlrpc_queue_wait(req);
3729         if (rc)
3730                 GOTO(out, rc);
3731
3732         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
3733         if (msfs == NULL) {
3734                 GOTO(out, rc = -EPROTO);
3735         }
3736
3737         *osfs = *msfs;
3738
3739         EXIT;
3740  out:
3741         ptlrpc_req_finished(req);
3742         return rc;
3743 }
3744
3745 /* Retrieve object striping information.
3746  *
3747  * @lmmu is a pointer to an in-core struct with lmm_ost_count indicating
3748  * the maximum number of OST indices which will fit in the user buffer.
3749  * lmm_magic must be LOV_MAGIC (we only use 1 slot here).
3750  */
3751 static int osc_getstripe(struct lov_stripe_md *lsm, struct lov_user_md *lump)
3752 {
3753         /* we use lov_user_md_v3 because it is larger than lov_user_md_v1 */
3754         struct lov_user_md_v3 lum, *lumk;
3755         struct lov_user_ost_data_v1 *lmm_objects;
3756         int rc = 0, lum_size;
3757         ENTRY;
3758
3759         if (!lsm)
3760                 RETURN(-ENODATA);
3761
3762         /* we only need the header part from user space to get lmm_magic and
3763          * lmm_stripe_count, (the header part is common to v1 and v3) */
3764         lum_size = sizeof(struct lov_user_md_v1);
3765         if (cfs_copy_from_user(&lum, lump, lum_size))
3766                 RETURN(-EFAULT);
3767
3768         if ((lum.lmm_magic != LOV_USER_MAGIC_V1) &&
3769             (lum.lmm_magic != LOV_USER_MAGIC_V3))
3770                 RETURN(-EINVAL);
3771
3772         /* lov_user_md_vX and lov_mds_md_vX must have the same size */
3773         LASSERT(sizeof(struct lov_user_md_v1) == sizeof(struct lov_mds_md_v1));
3774         LASSERT(sizeof(struct lov_user_md_v3) == sizeof(struct lov_mds_md_v3));
3775         LASSERT(sizeof(lum.lmm_objects[0]) == sizeof(lumk->lmm_objects[0]));
3776
3777         /* we can use lov_mds_md_size() to compute lum_size
3778          * because lov_user_md_vX and lov_mds_md_vX have the same size */
3779         if (lum.lmm_stripe_count > 0) {
3780                 lum_size = lov_mds_md_size(lum.lmm_stripe_count, lum.lmm_magic);
3781                 OBD_ALLOC(lumk, lum_size);
3782                 if (!lumk)
3783                         RETURN(-ENOMEM);
3784
3785                 if (lum.lmm_magic == LOV_USER_MAGIC_V1)
3786                         lmm_objects = &(((struct lov_user_md_v1 *)lumk)->lmm_objects[0]);
3787                 else
3788                         lmm_objects = &(lumk->lmm_objects[0]);
3789                 lmm_objects->l_object_id = lsm->lsm_object_id;
3790         } else {
3791                 lum_size = lov_mds_md_size(0, lum.lmm_magic);
3792                 lumk = &lum;
3793         }
3794
3795         lumk->lmm_object_id = lsm->lsm_object_id;
3796         lumk->lmm_object_seq = lsm->lsm_object_seq;
3797         lumk->lmm_stripe_count = 1;
3798
3799         if (cfs_copy_to_user(lump, lumk, lum_size))
3800                 rc = -EFAULT;
3801
3802         if (lumk != &lum)
3803                 OBD_FREE(lumk, lum_size);
3804
3805         RETURN(rc);
3806 }
3807
3808
3809 static int osc_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
3810                          void *karg, void *uarg)
3811 {
3812         struct obd_device *obd = exp->exp_obd;
3813         struct obd_ioctl_data *data = karg;
3814         int err = 0;
3815         ENTRY;
3816
3817         if (!cfs_try_module_get(THIS_MODULE)) {
3818                 CERROR("Can't get module. Is it alive?");
3819                 return -EINVAL;
3820         }
3821         switch (cmd) {
3822         case OBD_IOC_LOV_GET_CONFIG: {
3823                 char *buf;
3824                 struct lov_desc *desc;
3825                 struct obd_uuid uuid;
3826
3827                 buf = NULL;
3828                 len = 0;
3829                 if (obd_ioctl_getdata(&buf, &len, (void *)uarg))
3830                         GOTO(out, err = -EINVAL);
3831
3832                 data = (struct obd_ioctl_data *)buf;
3833
3834                 if (sizeof(*desc) > data->ioc_inllen1) {
3835                         obd_ioctl_freedata(buf, len);
3836                         GOTO(out, err = -EINVAL);
3837                 }
3838
3839                 if (data->ioc_inllen2 < sizeof(uuid)) {
3840                         obd_ioctl_freedata(buf, len);
3841                         GOTO(out, err = -EINVAL);
3842                 }
3843
3844                 desc = (struct lov_desc *)data->ioc_inlbuf1;
3845                 desc->ld_tgt_count = 1;
3846                 desc->ld_active_tgt_count = 1;
3847                 desc->ld_default_stripe_count = 1;
3848                 desc->ld_default_stripe_size = 0;
3849                 desc->ld_default_stripe_offset = 0;
3850                 desc->ld_pattern = 0;
3851                 memcpy(&desc->ld_uuid, &obd->obd_uuid, sizeof(uuid));
3852
3853                 memcpy(data->ioc_inlbuf2, &obd->obd_uuid, sizeof(uuid));
3854
3855                 err = cfs_copy_to_user((void *)uarg, buf, len);
3856                 if (err)
3857                         err = -EFAULT;
3858                 obd_ioctl_freedata(buf, len);
3859                 GOTO(out, err);
3860         }
3861         case LL_IOC_LOV_SETSTRIPE:
3862                 err = obd_alloc_memmd(exp, karg);
3863                 if (err > 0)
3864                         err = 0;
3865                 GOTO(out, err);
3866         case LL_IOC_LOV_GETSTRIPE:
3867                 err = osc_getstripe(karg, uarg);
3868                 GOTO(out, err);
3869         case OBD_IOC_CLIENT_RECOVER:
3870                 err = ptlrpc_recover_import(obd->u.cli.cl_import,
3871                                             data->ioc_inlbuf1);
3872                 if (err > 0)
3873                         err = 0;
3874                 GOTO(out, err);
3875         case IOC_OSC_SET_ACTIVE:
3876                 err = ptlrpc_set_import_active(obd->u.cli.cl_import,
3877                                                data->ioc_offset);
3878                 GOTO(out, err);
3879         case OBD_IOC_POLL_QUOTACHECK:
3880                 err = lquota_poll_check(quota_interface, exp,
3881                                         (struct if_quotacheck *)karg);
3882                 GOTO(out, err);
3883         case OBD_IOC_PING_TARGET:
3884                 err = ptlrpc_obd_ping(obd);
3885                 GOTO(out, err);
3886         default:
3887                 CDEBUG(D_INODE, "unrecognised ioctl %#x by %s\n",
3888                        cmd, cfs_curproc_comm());
3889                 GOTO(out, err = -ENOTTY);
3890         }
3891 out:
3892         cfs_module_put(THIS_MODULE);
3893         return err;
3894 }
3895
3896 static int osc_get_info(struct obd_export *exp, obd_count keylen,
3897                         void *key, __u32 *vallen, void *val,
3898                         struct lov_stripe_md *lsm)
3899 {
3900         ENTRY;
3901         if (!vallen || !val)
3902                 RETURN(-EFAULT);
3903
3904         if (KEY_IS(KEY_LOCK_TO_STRIPE)) {
3905                 __u32 *stripe = val;
3906                 *vallen = sizeof(*stripe);
3907                 *stripe = 0;
3908                 RETURN(0);
3909         } else if (KEY_IS(KEY_LAST_ID)) {
3910                 struct ptlrpc_request *req;
3911                 obd_id                *reply;
3912                 char                  *tmp;
3913                 int                    rc;
3914
3915                 req = ptlrpc_request_alloc(class_exp2cliimp(exp),
3916                                            &RQF_OST_GET_INFO_LAST_ID);
3917                 if (req == NULL)
3918                         RETURN(-ENOMEM);
3919
3920                 req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_KEY,
3921                                      RCL_CLIENT, keylen);
3922                 rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GET_INFO);
3923                 if (rc) {
3924                         ptlrpc_request_free(req);
3925                         RETURN(rc);
3926                 }
3927
3928                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
3929                 memcpy(tmp, key, keylen);
3930
3931                 req->rq_no_delay = req->rq_no_resend = 1;
3932                 ptlrpc_request_set_replen(req);
3933                 rc = ptlrpc_queue_wait(req);
3934                 if (rc)
3935                         GOTO(out, rc);
3936
3937                 reply = req_capsule_server_get(&req->rq_pill, &RMF_OBD_ID);
3938                 if (reply == NULL)
3939                         GOTO(out, rc = -EPROTO);
3940
3941                 *((obd_id *)val) = *reply;
3942         out:
3943                 ptlrpc_req_finished(req);
3944                 RETURN(rc);
3945         } else if (KEY_IS(KEY_FIEMAP)) {
3946                 struct ptlrpc_request *req;
3947                 struct ll_user_fiemap *reply;
3948                 char *tmp;
3949                 int rc;
3950
3951                 req = ptlrpc_request_alloc(class_exp2cliimp(exp),
3952                                            &RQF_OST_GET_INFO_FIEMAP);
3953                 if (req == NULL)
3954                         RETURN(-ENOMEM);
3955
3956                 req_capsule_set_size(&req->rq_pill, &RMF_FIEMAP_KEY,
3957                                      RCL_CLIENT, keylen);
3958                 req_capsule_set_size(&req->rq_pill, &RMF_FIEMAP_VAL,
3959                                      RCL_CLIENT, *vallen);
3960                 req_capsule_set_size(&req->rq_pill, &RMF_FIEMAP_VAL,
3961                                      RCL_SERVER, *vallen);
3962
3963                 rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GET_INFO);
3964                 if (rc) {
3965                         ptlrpc_request_free(req);
3966                         RETURN(rc);
3967                 }
3968
3969                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_FIEMAP_KEY);
3970                 memcpy(tmp, key, keylen);
3971                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_FIEMAP_VAL);
3972                 memcpy(tmp, val, *vallen);
3973
3974                 ptlrpc_request_set_replen(req);
3975                 rc = ptlrpc_queue_wait(req);
3976                 if (rc)
3977                         GOTO(out1, rc);
3978
3979                 reply = req_capsule_server_get(&req->rq_pill, &RMF_FIEMAP_VAL);
3980                 if (reply == NULL)
3981                         GOTO(out1, rc = -EPROTO);
3982
3983                 memcpy(val, reply, *vallen);
3984         out1:
3985                 ptlrpc_req_finished(req);
3986
3987                 RETURN(rc);
3988         }
3989
3990         RETURN(-EINVAL);
3991 }
3992
3993 static int osc_setinfo_mds_connect_import(struct obd_import *imp)
3994 {
3995         struct llog_ctxt *ctxt;
3996         int rc = 0;
3997         ENTRY;
3998
3999         ctxt = llog_get_context(imp->imp_obd, LLOG_MDS_OST_ORIG_CTXT);
4000         if (ctxt) {
4001                 rc = llog_initiator_connect(ctxt);
4002                 llog_ctxt_put(ctxt);
4003         } else {
4004                 /* XXX return an error? skip setting below flags? */
4005         }
4006
4007         cfs_spin_lock(&imp->imp_lock);
4008         imp->imp_server_timeout = 1;
4009         imp->imp_pingable = 1;
4010         cfs_spin_unlock(&imp->imp_lock);
4011         CDEBUG(D_RPCTRACE, "pinging OST %s\n", obd2cli_tgt(imp->imp_obd));
4012
4013         RETURN(rc);
4014 }
4015
4016 static int osc_setinfo_mds_conn_interpret(const struct lu_env *env,
4017                                           struct ptlrpc_request *req,
4018                                           void *aa, int rc)
4019 {
4020         ENTRY;
4021         if (rc != 0)
4022                 RETURN(rc);
4023
4024         RETURN(osc_setinfo_mds_connect_import(req->rq_import));
4025 }
4026
4027 static int osc_set_info_async(struct obd_export *exp, obd_count keylen,
4028                               void *key, obd_count vallen, void *val,
4029                               struct ptlrpc_request_set *set)
4030 {
4031         struct ptlrpc_request *req;
4032         struct obd_device     *obd = exp->exp_obd;
4033         struct obd_import     *imp = class_exp2cliimp(exp);
4034         char                  *tmp;
4035         int                    rc;
4036         ENTRY;
4037
4038         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_SHUTDOWN, 10);
4039
4040         if (KEY_IS(KEY_NEXT_ID)) {
4041                 obd_id new_val;
4042                 struct osc_creator *oscc = &obd->u.cli.cl_oscc;
4043
4044                 if (vallen != sizeof(obd_id))
4045                         RETURN(-ERANGE);
4046                 if (val == NULL)
4047                         RETURN(-EINVAL);
4048
4049                 if (vallen != sizeof(obd_id))
4050                         RETURN(-EINVAL);
4051
4052                 /* avoid race between allocate new object and set next id
4053                  * from ll_sync thread */
4054                 cfs_spin_lock(&oscc->oscc_lock);
4055                 new_val = *((obd_id*)val) + 1;
4056                 if (new_val > oscc->oscc_next_id)
4057                         oscc->oscc_next_id = new_val;
4058                 cfs_spin_unlock(&oscc->oscc_lock);
4059                 CDEBUG(D_HA, "%s: set oscc_next_id = "LPU64"\n",
4060                        exp->exp_obd->obd_name,
4061                        obd->u.cli.cl_oscc.oscc_next_id);
4062
4063                 RETURN(0);
4064         }
4065
4066         if (KEY_IS(KEY_CHECKSUM)) {
4067                 if (vallen != sizeof(int))
4068                         RETURN(-EINVAL);
4069                 exp->exp_obd->u.cli.cl_checksum = (*(int *)val) ? 1 : 0;
4070                 RETURN(0);
4071         }
4072
4073         if (KEY_IS(KEY_SPTLRPC_CONF)) {
4074                 sptlrpc_conf_client_adapt(obd);
4075                 RETURN(0);
4076         }
4077
4078         if (KEY_IS(KEY_FLUSH_CTX)) {
4079                 sptlrpc_import_flush_my_ctx(imp);
4080                 RETURN(0);
4081         }
4082
4083         if (!set && !KEY_IS(KEY_GRANT_SHRINK))
4084                 RETURN(-EINVAL);
4085
4086         /* We pass all other commands directly to OST. Since nobody calls osc
4087            methods directly and everybody is supposed to go through LOV, we
4088            assume lov checked invalid values for us.
4089            The only recognised values so far are evict_by_nid and mds_conn.
4090            Even if something bad goes through, we'd get a -EINVAL from OST
4091            anyway. */
4092
4093         if (KEY_IS(KEY_GRANT_SHRINK))
4094                 req = ptlrpc_request_alloc(imp, &RQF_OST_SET_GRANT_INFO);
4095         else
4096                 req = ptlrpc_request_alloc(imp, &RQF_OBD_SET_INFO);
4097
4098         if (req == NULL)
4099                 RETURN(-ENOMEM);
4100
4101         req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_KEY,
4102                              RCL_CLIENT, keylen);
4103         req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_VAL,
4104                              RCL_CLIENT, vallen);
4105         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SET_INFO);
4106         if (rc) {
4107                 ptlrpc_request_free(req);
4108                 RETURN(rc);
4109         }
4110
4111         tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
4112         memcpy(tmp, key, keylen);
4113         tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_VAL);
4114         memcpy(tmp, val, vallen);
4115
4116         if (KEY_IS(KEY_MDS_CONN)) {
4117                 struct osc_creator *oscc = &obd->u.cli.cl_oscc;
4118
4119                 oscc->oscc_oa.o_seq = (*(__u32 *)val);
4120                 oscc->oscc_oa.o_valid |= OBD_MD_FLGROUP;
4121                 LASSERT_SEQ_IS_MDT(oscc->oscc_oa.o_seq);
4122                 req->rq_no_delay = req->rq_no_resend = 1;
4123                 req->rq_interpret_reply = osc_setinfo_mds_conn_interpret;
4124         } else if (KEY_IS(KEY_GRANT_SHRINK)) {
4125                 struct osc_grant_args *aa;
4126                 struct obdo *oa;
4127
4128                 CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
4129                 aa = ptlrpc_req_async_args(req);
4130                 OBDO_ALLOC(oa);
4131                 if (!oa) {
4132                         ptlrpc_req_finished(req);
4133                         RETURN(-ENOMEM);
4134                 }
4135                 *oa = ((struct ost_body *)val)->oa;
4136                 aa->aa_oa = oa;
4137                 req->rq_interpret_reply = osc_shrink_grant_interpret;
4138         }
4139
4140         ptlrpc_request_set_replen(req);
4141         if (!KEY_IS(KEY_GRANT_SHRINK)) {
4142                 LASSERT(set != NULL);
4143                 ptlrpc_set_add_req(set, req);
4144                 ptlrpc_check_set(NULL, set);
4145         } else
4146                 ptlrpcd_add_req(req, PSCOPE_OTHER);
4147
4148         RETURN(0);
4149 }
4150
4151
4152 static struct llog_operations osc_size_repl_logops = {
4153         lop_cancel: llog_obd_repl_cancel
4154 };
4155
4156 static struct llog_operations osc_mds_ost_orig_logops;
4157
4158 static int __osc_llog_init(struct obd_device *obd, struct obd_llog_group *olg,
4159                            struct obd_device *tgt, struct llog_catid *catid)
4160 {
4161         int rc;
4162         ENTRY;
4163
4164         rc = llog_setup(obd, &obd->obd_olg, LLOG_MDS_OST_ORIG_CTXT, tgt, 1,
4165                         &catid->lci_logid, &osc_mds_ost_orig_logops);
4166         if (rc) {
4167                 CERROR("failed LLOG_MDS_OST_ORIG_CTXT\n");
4168                 GOTO(out, rc);
4169         }
4170
4171         rc = llog_setup(obd, &obd->obd_olg, LLOG_SIZE_REPL_CTXT, tgt, 1,
4172                         NULL, &osc_size_repl_logops);
4173         if (rc) {
4174                 struct llog_ctxt *ctxt =
4175                         llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
4176                 if (ctxt)
4177                         llog_cleanup(ctxt);
4178                 CERROR("failed LLOG_SIZE_REPL_CTXT\n");
4179         }
4180         GOTO(out, rc);
4181 out:
4182         if (rc) {
4183                 CERROR("osc '%s' tgt '%s' catid %p rc=%d\n",
4184                        obd->obd_name, tgt->obd_name, catid, rc);
4185                 CERROR("logid "LPX64":0x%x\n",
4186                        catid->lci_logid.lgl_oid, catid->lci_logid.lgl_ogen);
4187         }
4188         return rc;
4189 }
4190
4191 static int osc_llog_init(struct obd_device *obd, struct obd_llog_group *olg,
4192                          struct obd_device *disk_obd, int *index)
4193 {
4194         struct llog_catid catid;
4195         static char name[32] = CATLIST;
4196         int rc;
4197         ENTRY;
4198
4199         LASSERT(olg == &obd->obd_olg);
4200
4201         cfs_mutex_down(&olg->olg_cat_processing);
4202         rc = llog_get_cat_list(disk_obd, name, *index, 1, &catid);
4203         if (rc) {
4204                 CERROR("rc: %d\n", rc);
4205                 GOTO(out, rc);
4206         }
4207
4208         CDEBUG(D_INFO, "%s: Init llog for %d - catid "LPX64"/"LPX64":%x\n",
4209                obd->obd_name, *index, catid.lci_logid.lgl_oid,
4210                catid.lci_logid.lgl_oseq, catid.lci_logid.lgl_ogen);
4211
4212         rc = __osc_llog_init(obd, olg, disk_obd, &catid);
4213         if (rc) {
4214                 CERROR("rc: %d\n", rc);
4215                 GOTO(out, rc);
4216         }
4217
4218         rc = llog_put_cat_list(disk_obd, name, *index, 1, &catid);
4219         if (rc) {
4220                 CERROR("rc: %d\n", rc);
4221                 GOTO(out, rc);
4222         }
4223
4224  out:
4225         cfs_mutex_up(&olg->olg_cat_processing);
4226
4227         return rc;
4228 }
4229
4230 static int osc_llog_finish(struct obd_device *obd, int count)
4231 {
4232         struct llog_ctxt *ctxt;
4233         int rc = 0, rc2 = 0;
4234         ENTRY;
4235
4236         ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
4237         if (ctxt)
4238                 rc = llog_cleanup(ctxt);
4239
4240         ctxt = llog_get_context(obd, LLOG_SIZE_REPL_CTXT);
4241         if (ctxt)
4242                 rc2 = llog_cleanup(ctxt);
4243         if (!rc)
4244                 rc = rc2;
4245
4246         RETURN(rc);
4247 }
4248
4249 static int osc_reconnect(const struct lu_env *env,
4250                          struct obd_export *exp, struct obd_device *obd,
4251                          struct obd_uuid *cluuid,
4252                          struct obd_connect_data *data,
4253                          void *localdata)
4254 {
4255         struct client_obd *cli = &obd->u.cli;
4256
4257         if (data != NULL && (data->ocd_connect_flags & OBD_CONNECT_GRANT)) {
4258                 long lost_grant;
4259
4260                 client_obd_list_lock(&cli->cl_loi_list_lock);
4261                 data->ocd_grant = (cli->cl_avail_grant + cli->cl_dirty) ?:
4262                                 2 * cli->cl_max_pages_per_rpc << CFS_PAGE_SHIFT;
4263                 lost_grant = cli->cl_lost_grant;
4264                 cli->cl_lost_grant = 0;
4265                 client_obd_list_unlock(&cli->cl_loi_list_lock);
4266
4267                 CDEBUG(D_CACHE, "request ocd_grant: %d cl_avail_grant: %ld "
4268                        "cl_dirty: %ld cl_lost_grant: %ld\n", data->ocd_grant,
4269                        cli->cl_avail_grant, cli->cl_dirty, lost_grant);
4270                 CDEBUG(D_RPCTRACE, "ocd_connect_flags: "LPX64" ocd_version: %d"
4271                        " ocd_grant: %d\n", data->ocd_connect_flags,
4272                        data->ocd_version, data->ocd_grant);
4273         }
4274
4275         RETURN(0);
4276 }
4277
4278 static int osc_disconnect(struct obd_export *exp)
4279 {
4280         struct obd_device *obd = class_exp2obd(exp);
4281         struct llog_ctxt  *ctxt;
4282         int rc;
4283
4284         ctxt = llog_get_context(obd, LLOG_SIZE_REPL_CTXT);
4285         if (ctxt) {
4286                 if (obd->u.cli.cl_conn_count == 1) {
4287                         /* Flush any remaining cancel messages out to the
4288                          * target */
4289                         llog_sync(ctxt, exp);
4290                 }
4291                 llog_ctxt_put(ctxt);
4292         } else {
4293                 CDEBUG(D_HA, "No LLOG_SIZE_REPL_CTXT found in obd %p\n",
4294                        obd);
4295         }
4296
4297         rc = client_disconnect_export(exp);
4298         /**
4299          * Initially we put del_shrink_grant before disconnect_export, but it
4300          * causes the following problem if setup (connect) and cleanup
4301          * (disconnect) are tangled together.
4302          *      connect p1                     disconnect p2
4303          *   ptlrpc_connect_import
4304          *     ...............               class_manual_cleanup
4305          *                                     osc_disconnect
4306          *                                     del_shrink_grant
4307          *   ptlrpc_connect_interrupt
4308          *     init_grant_shrink
4309          *   add this client to shrink list
4310          *                                      cleanup_osc
4311          * Bang! pinger trigger the shrink.
4312          * So the osc should be disconnected from the shrink list, after we
4313          * are sure the import has been destroyed. BUG18662
4314          */
4315         if (obd->u.cli.cl_import == NULL)
4316                 osc_del_shrink_grant(&obd->u.cli);
4317         return rc;
4318 }
4319
4320 static int osc_import_event(struct obd_device *obd,
4321                             struct obd_import *imp,
4322                             enum obd_import_event event)
4323 {
4324         struct client_obd *cli;
4325         int rc = 0;
4326
4327         ENTRY;
4328         LASSERT(imp->imp_obd == obd);
4329
4330         switch (event) {
4331         case IMP_EVENT_DISCON: {
4332                 /* Only do this on the MDS OSC's */
4333                 if (imp->imp_server_timeout) {
4334                         struct osc_creator *oscc = &obd->u.cli.cl_oscc;
4335
4336                         cfs_spin_lock(&oscc->oscc_lock);
4337                         oscc->oscc_flags |= OSCC_FLAG_RECOVERING;
4338                         cfs_spin_unlock(&oscc->oscc_lock);
4339                 }
4340                 cli = &obd->u.cli;
4341                 client_obd_list_lock(&cli->cl_loi_list_lock);
4342                 cli->cl_avail_grant = 0;
4343                 cli->cl_lost_grant = 0;
4344                 client_obd_list_unlock(&cli->cl_loi_list_lock);
4345                 break;
4346         }
4347         case IMP_EVENT_INACTIVE: {
4348                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_INACTIVE, NULL);
4349                 break;
4350         }
4351         case IMP_EVENT_INVALIDATE: {
4352                 struct ldlm_namespace *ns = obd->obd_namespace;
4353                 struct lu_env         *env;
4354                 int                    refcheck;
4355
4356                 env = cl_env_get(&refcheck);
4357                 if (!IS_ERR(env)) {
4358                         /* Reset grants */
4359                         cli = &obd->u.cli;
4360                         client_obd_list_lock(&cli->cl_loi_list_lock);
4361                         /* all pages go to failing rpcs due to the invalid
4362                          * import */
4363                         osc_check_rpcs(env, cli);
4364                         client_obd_list_unlock(&cli->cl_loi_list_lock);
4365
4366                         ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
4367                         cl_env_put(env, &refcheck);
4368                 } else
4369                         rc = PTR_ERR(env);
4370                 break;
4371         }
4372         case IMP_EVENT_ACTIVE: {
4373                 /* Only do this on the MDS OSC's */
4374                 if (imp->imp_server_timeout) {
4375                         struct osc_creator *oscc = &obd->u.cli.cl_oscc;
4376
4377                         cfs_spin_lock(&oscc->oscc_lock);
4378                         oscc->oscc_flags &= ~OSCC_FLAG_NOSPC;
4379                         cfs_spin_unlock(&oscc->oscc_lock);
4380                 }
4381                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_ACTIVE, NULL);
4382                 break;
4383         }
4384         case IMP_EVENT_OCD: {
4385                 struct obd_connect_data *ocd = &imp->imp_connect_data;
4386
4387                 if (ocd->ocd_connect_flags & OBD_CONNECT_GRANT)
4388                         osc_init_grant(&obd->u.cli, ocd);
4389
4390                 /* See bug 7198 */
4391                 if (ocd->ocd_connect_flags & OBD_CONNECT_REQPORTAL)
4392                         imp->imp_client->cli_request_portal =OST_REQUEST_PORTAL;
4393
4394                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_OCD, NULL);
4395                 break;
4396         }
4397         case IMP_EVENT_DEACTIVATE: {
4398                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_DEACTIVATE, NULL);
4399                 break;
4400         }
4401         case IMP_EVENT_ACTIVATE: {
4402                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_ACTIVATE, NULL);
4403                 break;
4404         }
4405         default:
4406                 CERROR("Unknown import event %d\n", event);
4407                 LBUG();
4408         }
4409         RETURN(rc);
4410 }
4411
4412 /**
4413  * Determine whether the lock can be canceled before replaying the lock
4414  * during recovery, see bug16774 for detailed information.
4415  *
4416  * \retval zero the lock can't be canceled
4417  * \retval other ok to cancel
4418  */
4419 static int osc_cancel_for_recovery(struct ldlm_lock *lock)
4420 {
4421         check_res_locked(lock->l_resource);
4422
4423         /*
4424          * Cancel all unused extent lock in granted mode LCK_PR or LCK_CR.
4425          *
4426          * XXX as a future improvement, we can also cancel unused write lock
4427          * if it doesn't have dirty data and active mmaps.
4428          */
4429         if (lock->l_resource->lr_type == LDLM_EXTENT &&
4430             (lock->l_granted_mode == LCK_PR ||
4431              lock->l_granted_mode == LCK_CR) &&
4432             (osc_dlm_lock_pageref(lock) == 0))
4433                 RETURN(1);
4434
4435         RETURN(0);
4436 }
4437
4438 int osc_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
4439 {
4440         int rc;
4441         ENTRY;
4442
4443         ENTRY;
4444         rc = ptlrpcd_addref();
4445         if (rc)
4446                 RETURN(rc);
4447
4448         rc = client_obd_setup(obd, lcfg);
4449         if (rc) {
4450                 ptlrpcd_decref();
4451         } else {
4452                 struct lprocfs_static_vars lvars = { 0 };
4453                 struct client_obd *cli = &obd->u.cli;
4454
4455                 cli->cl_grant_shrink_interval = GRANT_SHRINK_INTERVAL;
4456                 lprocfs_osc_init_vars(&lvars);
4457                 if (lprocfs_obd_setup(obd, lvars.obd_vars) == 0) {
4458                         lproc_osc_attach_seqstat(obd);
4459                         sptlrpc_lprocfs_cliobd_attach(obd);
4460                         ptlrpc_lprocfs_register_obd(obd);
4461                 }
4462
4463                 oscc_init(obd);
4464                 /* We need to allocate a few requests more, because
4465                    brw_interpret tries to create new requests before freeing
4466                    previous ones. Ideally we want to have 2x max_rpcs_in_flight
4467                    reserved, but I afraid that might be too much wasted RAM
4468                    in fact, so 2 is just my guess and still should work. */
4469                 cli->cl_import->imp_rq_pool =
4470                         ptlrpc_init_rq_pool(cli->cl_max_rpcs_in_flight + 2,
4471                                             OST_MAXREQSIZE,
4472                                             ptlrpc_add_rqs_to_pool);
4473
4474                 CFS_INIT_LIST_HEAD(&cli->cl_grant_shrink_list);
4475                 cfs_sema_init(&cli->cl_grant_sem, 1);
4476
4477                 ns_register_cancel(obd->obd_namespace, osc_cancel_for_recovery);
4478         }
4479
4480         RETURN(rc);
4481 }
4482
4483 static int osc_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
4484 {
4485         int rc = 0;
4486         ENTRY;
4487
4488         switch (stage) {
4489         case OBD_CLEANUP_EARLY: {
4490                 struct obd_import *imp;
4491                 imp = obd->u.cli.cl_import;
4492                 CDEBUG(D_HA, "Deactivating import %s\n", obd->obd_name);
4493                 /* ptlrpc_abort_inflight to stop an mds_lov_synchronize */
4494                 ptlrpc_deactivate_import(imp);
4495                 cfs_spin_lock(&imp->imp_lock);
4496                 imp->imp_pingable = 0;
4497                 cfs_spin_unlock(&imp->imp_lock);
4498                 break;
4499         }
4500         case OBD_CLEANUP_EXPORTS: {
4501                 /* LU-464
4502                  * for echo client, export may be on zombie list, wait for
4503                  * zombie thread to cull it, because cli.cl_import will be
4504                  * cleared in client_disconnect_export():
4505                  *   class_export_destroy() -> obd_cleanup() ->
4506                  *   echo_device_free() -> echo_client_cleanup() ->
4507                  *   obd_disconnect() -> osc_disconnect() ->
4508                  *   client_disconnect_export()
4509                  */
4510                 obd_zombie_barrier();
4511                 /* If we set up but never connected, the
4512                    client import will not have been cleaned. */
4513                 if (obd->u.cli.cl_import) {
4514                         struct obd_import *imp;
4515                         cfs_down_write(&obd->u.cli.cl_sem);
4516                         imp = obd->u.cli.cl_import;
4517                         CDEBUG(D_CONFIG, "%s: client import never connected\n",
4518                                obd->obd_name);
4519                         ptlrpc_invalidate_import(imp);
4520                         if (imp->imp_rq_pool) {
4521                                 ptlrpc_free_rq_pool(imp->imp_rq_pool);
4522                                 imp->imp_rq_pool = NULL;
4523                         }
4524                         class_destroy_import(imp);
4525                         cfs_up_write(&obd->u.cli.cl_sem);
4526                         obd->u.cli.cl_import = NULL;
4527                 }
4528                 rc = obd_llog_finish(obd, 0);
4529                 if (rc != 0)
4530                         CERROR("failed to cleanup llogging subsystems\n");
4531                 break;
4532                 }
4533         }
4534         RETURN(rc);
4535 }
4536
4537 int osc_cleanup(struct obd_device *obd)
4538 {
4539         int rc;
4540
4541         ENTRY;
4542         ptlrpc_lprocfs_unregister_obd(obd);
4543         lprocfs_obd_cleanup(obd);
4544
4545         /* free memory of osc quota cache */
4546         lquota_cleanup(quota_interface, obd);
4547
4548         rc = client_obd_cleanup(obd);
4549
4550         ptlrpcd_decref();
4551         RETURN(rc);
4552 }
4553
4554 int osc_process_config_base(struct obd_device *obd, struct lustre_cfg *lcfg)
4555 {
4556         struct lprocfs_static_vars lvars = { 0 };
4557         int rc = 0;
4558
4559         lprocfs_osc_init_vars(&lvars);
4560
4561         switch (lcfg->lcfg_command) {
4562         default:
4563                 rc = class_process_proc_param(PARAM_OSC, lvars.obd_vars,
4564                                               lcfg, obd);
4565                 if (rc > 0)
4566                         rc = 0;
4567                 break;
4568         }
4569
4570         return(rc);
4571 }
4572
4573 static int osc_process_config(struct obd_device *obd, obd_count len, void *buf)
4574 {
4575         return osc_process_config_base(obd, buf);
4576 }
4577
4578 struct obd_ops osc_obd_ops = {
4579         .o_owner                = THIS_MODULE,
4580         .o_setup                = osc_setup,
4581         .o_precleanup           = osc_precleanup,
4582         .o_cleanup              = osc_cleanup,
4583         .o_add_conn             = client_import_add_conn,
4584         .o_del_conn             = client_import_del_conn,
4585         .o_connect              = client_connect_import,
4586         .o_reconnect            = osc_reconnect,
4587         .o_disconnect           = osc_disconnect,
4588         .o_statfs               = osc_statfs,
4589         .o_statfs_async         = osc_statfs_async,
4590         .o_packmd               = osc_packmd,
4591         .o_unpackmd             = osc_unpackmd,
4592         .o_precreate            = osc_precreate,
4593         .o_create               = osc_create,
4594         .o_create_async         = osc_create_async,
4595         .o_destroy              = osc_destroy,
4596         .o_getattr              = osc_getattr,
4597         .o_getattr_async        = osc_getattr_async,
4598         .o_setattr              = osc_setattr,
4599         .o_setattr_async        = osc_setattr_async,
4600         .o_brw                  = osc_brw,
4601         .o_punch                = osc_punch,
4602         .o_sync                 = osc_sync,
4603         .o_enqueue              = osc_enqueue,
4604         .o_change_cbdata        = osc_change_cbdata,
4605         .o_find_cbdata          = osc_find_cbdata,
4606         .o_cancel               = osc_cancel,
4607         .o_cancel_unused        = osc_cancel_unused,
4608         .o_iocontrol            = osc_iocontrol,
4609         .o_get_info             = osc_get_info,
4610         .o_set_info_async       = osc_set_info_async,
4611         .o_import_event         = osc_import_event,
4612         .o_llog_init            = osc_llog_init,
4613         .o_llog_finish          = osc_llog_finish,
4614         .o_process_config       = osc_process_config,
4615 };
4616
4617 extern struct lu_kmem_descr osc_caches[];
4618 extern cfs_spinlock_t       osc_ast_guard;
4619 extern cfs_lock_class_key_t osc_ast_guard_class;
4620
4621 int __init osc_init(void)
4622 {
4623         struct lprocfs_static_vars lvars = { 0 };
4624         int rc;
4625         ENTRY;
4626
4627         /* print an address of _any_ initialized kernel symbol from this
4628          * module, to allow debugging with gdb that doesn't support data
4629          * symbols from modules.*/
4630         CDEBUG(D_CONSOLE, "Lustre OSC module (%p).\n", &osc_caches);
4631
4632         rc = lu_kmem_init(osc_caches);
4633
4634         lprocfs_osc_init_vars(&lvars);
4635
4636         cfs_request_module("lquota");
4637         quota_interface = PORTAL_SYMBOL_GET(osc_quota_interface);
4638         lquota_init(quota_interface);
4639         init_obd_quota_ops(quota_interface, &osc_obd_ops);
4640
4641         rc = class_register_type(&osc_obd_ops, NULL, lvars.module_vars,
4642                                  LUSTRE_OSC_NAME, &osc_device_type);
4643         if (rc) {
4644                 if (quota_interface)
4645                         PORTAL_SYMBOL_PUT(osc_quota_interface);
4646                 lu_kmem_fini(osc_caches);
4647                 RETURN(rc);
4648         }
4649
4650         cfs_spin_lock_init(&osc_ast_guard);
4651         cfs_lockdep_set_class(&osc_ast_guard, &osc_ast_guard_class);
4652
4653         osc_mds_ost_orig_logops = llog_lvfs_ops;
4654         osc_mds_ost_orig_logops.lop_setup = llog_obd_origin_setup;
4655         osc_mds_ost_orig_logops.lop_cleanup = llog_obd_origin_cleanup;
4656         osc_mds_ost_orig_logops.lop_add = llog_obd_origin_add;
4657         osc_mds_ost_orig_logops.lop_connect = llog_origin_connect;
4658
4659         RETURN(rc);
4660 }
4661
4662 #ifdef __KERNEL__
4663 static void /*__exit*/ osc_exit(void)
4664 {
4665         lu_device_type_fini(&osc_device_type);
4666
4667         lquota_exit(quota_interface);
4668         if (quota_interface)
4669                 PORTAL_SYMBOL_PUT(osc_quota_interface);
4670
4671         class_unregister_type(LUSTRE_OSC_NAME);
4672         lu_kmem_fini(osc_caches);
4673 }
4674
4675 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
4676 MODULE_DESCRIPTION("Lustre Object Storage Client (OSC)");
4677 MODULE_LICENSE("GPL");
4678
4679 cfs_module(osc, LUSTRE_VERSION_STRING, osc_init, osc_exit);
4680 #endif