lustre/osc/osc_request.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * Copyright (c) 2011 Whamcloud, Inc.
  34  */
  35 /*
  36  * This file is part of Lustre, http://www.lustre.org/
  37  * Lustre is a trademark of Sun Microsystems, Inc.
  38  */
  39
  40 #ifndef EXPORT_SYMTAB
  41 # define EXPORT_SYMTAB
  42 #endif
  43 #define DEBUG_SUBSYSTEM S_OSC
  44
  45 #include <libcfs/libcfs.h>
  46
  47 #ifndef __KERNEL__
  48 # include <liblustre.h>
  49 #endif
  50
  51 #include <lustre_dlm.h>
  52 #include <lustre_net.h>
  53 #include <lustre/lustre_user.h>
  54 #include <obd_cksum.h>
  55 #include <obd_ost.h>
  56 #include <obd_lov.h>
  57
  58 #ifdef  __CYGWIN__
  59 # include <ctype.h>
  60 #endif
  61
  62 #include <lustre_ha.h>
  63 #include <lprocfs_status.h>
  64 #include <lustre_log.h>
  65 #include <lustre_debug.h>
  66 #include <lustre_param.h>
  67 #include "osc_internal.h"
  68
  69 static quota_interface_t *quota_interface = NULL;
  70 extern quota_interface_t osc_quota_interface;
  71
  72 static void osc_release_ppga(struct brw_page **ppga, obd_count count);
  73 static int brw_interpret(const struct lu_env *env,
  74                          struct ptlrpc_request *req, void *data, int rc);
  75 int osc_cleanup(struct obd_device *obd);
  76
  77 /* Pack OSC object metadata for disk storage (LE byte order). */
  78 static int osc_packmd(struct obd_export *exp, struct lov_mds_md **lmmp,
  79                       struct lov_stripe_md *lsm)
  80 {
  81         int lmm_size;
  82         ENTRY;
  83
  84         lmm_size = sizeof(**lmmp);
  85         if (!lmmp)
  86                 RETURN(lmm_size);
  87
  88         if (*lmmp && !lsm) {
  89                 OBD_FREE(*lmmp, lmm_size);
  90                 *lmmp = NULL;
  91                 RETURN(0);
  92         }
  93
  94         if (!*lmmp) {
  95                 OBD_ALLOC(*lmmp, lmm_size);
  96                 if (!*lmmp)
  97                         RETURN(-ENOMEM);
  98         }
  99
 100         if (lsm) {
 101                 LASSERT(lsm->lsm_object_id);
 102                 LASSERT_SEQ_IS_MDT(lsm->lsm_object_seq);
 103                 (*lmmp)->lmm_object_id = cpu_to_le64(lsm->lsm_object_id);
 104                 (*lmmp)->lmm_object_seq = cpu_to_le64(lsm->lsm_object_seq);
 105         }
 106
 107         RETURN(lmm_size);
 108 }
 109
 110 /* Unpack OSC object metadata from disk storage (LE byte order). */
 111 static int osc_unpackmd(struct obd_export *exp, struct lov_stripe_md **lsmp,
 112                         struct lov_mds_md *lmm, int lmm_bytes)
 113 {
 114         int lsm_size;
 115         struct obd_import *imp = class_exp2cliimp(exp);
 116         ENTRY;
 117
 118         if (lmm != NULL) {
 119                 if (lmm_bytes < sizeof (*lmm)) {
 120                         CERROR("lov_mds_md too small: %d, need %d\n",
 121                                lmm_bytes, (int)sizeof(*lmm));
 122                         RETURN(-EINVAL);
 123                 }
 124                 /* XXX LOV_MAGIC etc check? */
 125
 126                 if (lmm->lmm_object_id == 0) {
 127                         CERROR("lov_mds_md: zero lmm_object_id\n");
 128                         RETURN(-EINVAL);
 129                 }
 130         }
 131
 132         lsm_size = lov_stripe_md_size(1);
 133         if (lsmp == NULL)
 134                 RETURN(lsm_size);
 135
 136         if (*lsmp != NULL && lmm == NULL) {
 137                 OBD_FREE((*lsmp)->lsm_oinfo[0], sizeof(struct lov_oinfo));
 138                 OBD_FREE(*lsmp, lsm_size);
 139                 *lsmp = NULL;
 140                 RETURN(0);
 141         }
 142
 143         if (*lsmp == NULL) {
 144                 OBD_ALLOC(*lsmp, lsm_size);
 145                 if (*lsmp == NULL)
 146                         RETURN(-ENOMEM);
 147                 OBD_ALLOC((*lsmp)->lsm_oinfo[0], sizeof(struct lov_oinfo));
 148                 if ((*lsmp)->lsm_oinfo[0] == NULL) {
 149                         OBD_FREE(*lsmp, lsm_size);
 150                         RETURN(-ENOMEM);
 151                 }
 152                 loi_init((*lsmp)->lsm_oinfo[0]);
 153         }
 154
 155         if (lmm != NULL) {
 156                 /* XXX zero *lsmp? */
 157                 (*lsmp)->lsm_object_id = le64_to_cpu (lmm->lmm_object_id);
 158                 (*lsmp)->lsm_object_seq = le64_to_cpu (lmm->lmm_object_seq);
 159                 LASSERT((*lsmp)->lsm_object_id);
 160                 LASSERT_SEQ_IS_MDT((*lsmp)->lsm_object_seq);
 161         }
 162
 163         if (imp != NULL &&
 164             (imp->imp_connect_data.ocd_connect_flags & OBD_CONNECT_MAXBYTES))
 165                 (*lsmp)->lsm_maxbytes = imp->imp_connect_data.ocd_maxbytes;
 166         else
 167                 (*lsmp)->lsm_maxbytes = LUSTRE_STRIPE_MAXBYTES;
 168
 169         RETURN(lsm_size);
 170 }
 171
 172 static inline void osc_pack_capa(struct ptlrpc_request *req,
 173                                  struct ost_body *body, void *capa)
 174 {
 175         struct obd_capa *oc = (struct obd_capa *)capa;
 176         struct lustre_capa *c;
 177
 178         if (!capa)
 179                 return;
 180
 181         c = req_capsule_client_get(&req->rq_pill, &RMF_CAPA1);
 182         LASSERT(c);
 183         capa_cpy(c, oc);
 184         body->oa.o_valid |= OBD_MD_FLOSSCAPA;
 185         DEBUG_CAPA(D_SEC, c, "pack");
 186 }
 187
 188 static inline void osc_pack_req_body(struct ptlrpc_request *req,
 189                                      struct obd_info *oinfo)
 190 {
 191         struct ost_body *body;
 192
 193         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 194         LASSERT(body);
 195
 196         lustre_set_wire_obdo(&body->oa, oinfo->oi_oa);
 197         osc_pack_capa(req, body, oinfo->oi_capa);
 198 }
 199
 200 static inline void osc_set_capa_size(struct ptlrpc_request *req,
 201                                      const struct req_msg_field *field,
 202                                      struct obd_capa *oc)
 203 {
 204         if (oc == NULL)
 205                 req_capsule_set_size(&req->rq_pill, field, RCL_CLIENT, 0);
 206         else
 207                 /* it is already calculated as sizeof struct obd_capa */
 208                 ;
 209 }
 210
 211 static int osc_getattr_interpret(const struct lu_env *env,
 212                                  struct ptlrpc_request *req,
 213                                  struct osc_async_args *aa, int rc)
 214 {
 215         struct ost_body *body;
 216         ENTRY;
 217
 218         if (rc != 0)
 219                 GOTO(out, rc);
 220
 221         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 222         if (body) {
 223                 CDEBUG(D_INODE, "mode: %o\n", body->oa.o_mode);
 224                 lustre_get_wire_obdo(aa->aa_oi->oi_oa, &body->oa);
 225
 226                 /* This should really be sent by the OST */
 227                 aa->aa_oi->oi_oa->o_blksize = PTLRPC_MAX_BRW_SIZE;
 228                 aa->aa_oi->oi_oa->o_valid |= OBD_MD_FLBLKSZ;
 229         } else {
 230                 CDEBUG(D_INFO, "can't unpack ost_body\n");
 231                 rc = -EPROTO;
 232                 aa->aa_oi->oi_oa->o_valid = 0;
 233         }
 234 out:
 235         rc = aa->aa_oi->oi_cb_up(aa->aa_oi, rc);
 236         RETURN(rc);
 237 }
 238
 239 static int osc_getattr_async(struct obd_export *exp, struct obd_info *oinfo,
 240                              struct ptlrpc_request_set *set)
 241 {
 242         struct ptlrpc_request *req;
 243         struct osc_async_args *aa;
 244         int                    rc;
 245         ENTRY;
 246
 247         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_GETATTR);
 248         if (req == NULL)
 249                 RETURN(-ENOMEM);
 250
 251         osc_set_capa_size(req, &RMF_CAPA1, oinfo->oi_capa);
 252         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GETATTR);
 253         if (rc) {
 254                 ptlrpc_request_free(req);
 255                 RETURN(rc);
 256         }
 257
 258         osc_pack_req_body(req, oinfo);
 259
 260         ptlrpc_request_set_replen(req);
 261         req->rq_interpret_reply = (ptlrpc_interpterer_t)osc_getattr_interpret;
 262
 263         CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
 264         aa = ptlrpc_req_async_args(req);
 265         aa->aa_oi = oinfo;
 266
 267         ptlrpc_set_add_req(set, req);
 268         RETURN(0);
 269 }
 270
 271 static int osc_getattr(struct obd_export *exp, struct obd_info *oinfo)
 272 {
 273         struct ptlrpc_request *req;
 274         struct ost_body       *body;
 275         int                    rc;
 276         ENTRY;
 277
 278         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_GETATTR);
 279         if (req == NULL)
 280                 RETURN(-ENOMEM);
 281
 282         osc_set_capa_size(req, &RMF_CAPA1, oinfo->oi_capa);
 283         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GETATTR);
 284         if (rc) {
 285                 ptlrpc_request_free(req);
 286                 RETURN(rc);
 287         }
 288
 289         osc_pack_req_body(req, oinfo);
 290
 291         ptlrpc_request_set_replen(req);
 292
 293         rc = ptlrpc_queue_wait(req);
 294         if (rc)
 295                 GOTO(out, rc);
 296
 297         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 298         if (body == NULL)
 299                 GOTO(out, rc = -EPROTO);
 300
 301         CDEBUG(D_INODE, "mode: %o\n", body->oa.o_mode);
 302         lustre_get_wire_obdo(oinfo->oi_oa, &body->oa);
 303
 304         /* This should really be sent by the OST */
 305         oinfo->oi_oa->o_blksize = PTLRPC_MAX_BRW_SIZE;
 306         oinfo->oi_oa->o_valid |= OBD_MD_FLBLKSZ;
 307
 308         EXIT;
 309  out:
 310         ptlrpc_req_finished(req);
 311         return rc;
 312 }
 313
 314 static int osc_setattr(struct obd_export *exp, struct obd_info *oinfo,
 315                        struct obd_trans_info *oti)
 316 {
 317         struct ptlrpc_request *req;
 318         struct ost_body       *body;
 319         int                    rc;
 320         ENTRY;
 321
 322         LASSERT(oinfo->oi_oa->o_valid & OBD_MD_FLGROUP);
 323
 324         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_SETATTR);
 325         if (req == NULL)
 326                 RETURN(-ENOMEM);
 327
 328         osc_set_capa_size(req, &RMF_CAPA1, oinfo->oi_capa);
 329         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SETATTR);
 330         if (rc) {
 331                 ptlrpc_request_free(req);
 332                 RETURN(rc);
 333         }
 334
 335         osc_pack_req_body(req, oinfo);
 336
 337         ptlrpc_request_set_replen(req);
 338
 339         rc = ptlrpc_queue_wait(req);
 340         if (rc)
 341                 GOTO(out, rc);
 342
 343         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 344         if (body == NULL)
 345                 GOTO(out, rc = -EPROTO);
 346
 347         lustre_get_wire_obdo(oinfo->oi_oa, &body->oa);
 348
 349         EXIT;
 350 out:
 351         ptlrpc_req_finished(req);
 352         RETURN(rc);
 353 }
 354
 355 static int osc_setattr_interpret(const struct lu_env *env,
 356                                  struct ptlrpc_request *req,
 357                                  struct osc_setattr_args *sa, int rc)
 358 {
 359         struct ost_body *body;
 360         ENTRY;
 361
 362         if (rc != 0)
 363                 GOTO(out, rc);
 364
 365         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 366         if (body == NULL)
 367                 GOTO(out, rc = -EPROTO);
 368
 369         lustre_get_wire_obdo(sa->sa_oa, &body->oa);
 370 out:
 371         rc = sa->sa_upcall(sa->sa_cookie, rc);
 372         RETURN(rc);
 373 }
 374
 375 int osc_setattr_async_base(struct obd_export *exp, struct obd_info *oinfo,
 376                            struct obd_trans_info *oti,
 377                            obd_enqueue_update_f upcall, void *cookie,
 378                            struct ptlrpc_request_set *rqset)
 379 {
 380         struct ptlrpc_request   *req;
 381         struct osc_setattr_args *sa;
 382         int                      rc;
 383         ENTRY;
 384
 385         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_SETATTR);
 386         if (req == NULL)
 387                 RETURN(-ENOMEM);
 388
 389         osc_set_capa_size(req, &RMF_CAPA1, oinfo->oi_capa);
 390         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SETATTR);
 391         if (rc) {
 392                 ptlrpc_request_free(req);
 393                 RETURN(rc);
 394         }
 395
 396         if (oti && oinfo->oi_oa->o_valid & OBD_MD_FLCOOKIE)
 397                 oinfo->oi_oa->o_lcookie = *oti->oti_logcookies;
 398
 399         osc_pack_req_body(req, oinfo);
 400
 401         ptlrpc_request_set_replen(req);
 402
 403         /* do mds to ost setattr asynchronously */
 404         if (!rqset) {
 405                 /* Do not wait for response. */
 406                 ptlrpcd_add_req(req, PSCOPE_OTHER);
 407         } else {
 408                 req->rq_interpret_reply =
 409                         (ptlrpc_interpterer_t)osc_setattr_interpret;
 410
 411                 CLASSERT (sizeof(*sa) <= sizeof(req->rq_async_args));
 412                 sa = ptlrpc_req_async_args(req);
 413                 sa->sa_oa = oinfo->oi_oa;
 414                 sa->sa_upcall = upcall;
 415                 sa->sa_cookie = cookie;
 416
 417                 if (rqset == PTLRPCD_SET)
 418                         ptlrpcd_add_req(req, PSCOPE_OTHER);
 419                 else
 420                         ptlrpc_set_add_req(rqset, req);
 421         }
 422
 423         RETURN(0);
 424 }
 425
 426 static int osc_setattr_async(struct obd_export *exp, struct obd_info *oinfo,
 427                              struct obd_trans_info *oti,
 428                              struct ptlrpc_request_set *rqset)
 429 {
 430         return osc_setattr_async_base(exp, oinfo, oti,
 431                                       oinfo->oi_cb_up, oinfo, rqset);
 432 }
 433
 434 int osc_real_create(struct obd_export *exp, struct obdo *oa,
 435                     struct lov_stripe_md **ea, struct obd_trans_info *oti)
 436 {
 437         struct ptlrpc_request *req;
 438         struct ost_body       *body;
 439         struct lov_stripe_md  *lsm;
 440         int                    rc;
 441         ENTRY;
 442
 443         LASSERT(oa);
 444         LASSERT(ea);
 445
 446         lsm = *ea;
 447         if (!lsm) {
 448                 rc = obd_alloc_memmd(exp, &lsm);
 449                 if (rc < 0)
 450                         RETURN(rc);
 451         }
 452
 453         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_CREATE);
 454         if (req == NULL)
 455                 GOTO(out, rc = -ENOMEM);
 456
 457         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_CREATE);
 458         if (rc) {
 459                 ptlrpc_request_free(req);
 460                 GOTO(out, rc);
 461         }
 462
 463         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 464         LASSERT(body);
 465         lustre_set_wire_obdo(&body->oa, oa);
 466
 467         ptlrpc_request_set_replen(req);
 468
 469         if ((oa->o_valid & OBD_MD_FLFLAGS) &&
 470             oa->o_flags == OBD_FL_DELORPHAN) {
 471                 DEBUG_REQ(D_HA, req,
 472                           "delorphan from OST integration");
 473                 /* Don't resend the delorphan req */
 474                 req->rq_no_resend = req->rq_no_delay = 1;
 475         }
 476
 477         rc = ptlrpc_queue_wait(req);
 478         if (rc)
 479                 GOTO(out_req, rc);
 480
 481         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 482         if (body == NULL)
 483                 GOTO(out_req, rc = -EPROTO);
 484
 485         lustre_get_wire_obdo(oa, &body->oa);
 486
 487         /* This should really be sent by the OST */
 488         oa->o_blksize = PTLRPC_MAX_BRW_SIZE;
 489         oa->o_valid |= OBD_MD_FLBLKSZ;
 490
 491         /* XXX LOV STACKING: the lsm that is passed to us from LOV does not
 492          * have valid lsm_oinfo data structs, so don't go touching that.
 493          * This needs to be fixed in a big way.
 494          */
 495         lsm->lsm_object_id = oa->o_id;
 496         lsm->lsm_object_seq = oa->o_seq;
 497         *ea = lsm;
 498
 499         if (oti != NULL) {
 500                 oti->oti_transno = lustre_msg_get_transno(req->rq_repmsg);
 501
 502                 if (oa->o_valid & OBD_MD_FLCOOKIE) {
 503                         if (!oti->oti_logcookies)
 504                                 oti_alloc_cookies(oti, 1);
 505                         *oti->oti_logcookies = oa->o_lcookie;
 506                 }
 507         }
 508
 509         CDEBUG(D_HA, "transno: "LPD64"\n",
 510                lustre_msg_get_transno(req->rq_repmsg));
 511 out_req:
 512         ptlrpc_req_finished(req);
 513 out:
 514         if (rc && !*ea)
 515                 obd_free_memmd(exp, &lsm);
 516         RETURN(rc);
 517 }
 518
 519 int osc_punch_base(struct obd_export *exp, struct obd_info *oinfo,
 520                    obd_enqueue_update_f upcall, void *cookie,
 521                    struct ptlrpc_request_set *rqset)
 522 {
 523         struct ptlrpc_request   *req;
 524         struct osc_setattr_args *sa;
 525         struct ost_body         *body;
 526         int                      rc;
 527         ENTRY;
 528
 529         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_PUNCH);
 530         if (req == NULL)
 531                 RETURN(-ENOMEM);
 532
 533         osc_set_capa_size(req, &RMF_CAPA1, oinfo->oi_capa);
 534         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_PUNCH);
 535         if (rc) {
 536                 ptlrpc_request_free(req);
 537                 RETURN(rc);
 538         }
 539         req->rq_request_portal = OST_IO_PORTAL; /* bug 7198 */
 540         ptlrpc_at_set_req_timeout(req);
 541
 542         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 543         LASSERT(body);
 544         lustre_set_wire_obdo(&body->oa, oinfo->oi_oa);
 545         osc_pack_capa(req, body, oinfo->oi_capa);
 546
 547         ptlrpc_request_set_replen(req);
 548
 549
 550         req->rq_interpret_reply = (ptlrpc_interpterer_t)osc_setattr_interpret;
 551         CLASSERT (sizeof(*sa) <= sizeof(req->rq_async_args));
 552         sa = ptlrpc_req_async_args(req);
 553         sa->sa_oa     = oinfo->oi_oa;
 554         sa->sa_upcall = upcall;
 555         sa->sa_cookie = cookie;
 556         if (rqset == PTLRPCD_SET)
 557                 ptlrpcd_add_req(req, PSCOPE_OTHER);
 558         else
 559                 ptlrpc_set_add_req(rqset, req);
 560
 561         RETURN(0);
 562 }
 563
 564 static int osc_punch(struct obd_export *exp, struct obd_info *oinfo,
 565                      struct obd_trans_info *oti,
 566                      struct ptlrpc_request_set *rqset)
 567 {
 568         oinfo->oi_oa->o_size   = oinfo->oi_policy.l_extent.start;
 569         oinfo->oi_oa->o_blocks = oinfo->oi_policy.l_extent.end;
 570         oinfo->oi_oa->o_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 571         return osc_punch_base(exp, oinfo,
 572                               oinfo->oi_cb_up, oinfo, rqset);
 573 }
 574
 575 static int osc_sync_interpret(const struct lu_env *env,
 576                               struct ptlrpc_request *req,
 577                               void *arg, int rc)
 578 {
 579         struct osc_async_args *aa = arg;
 580         struct ost_body *body;
 581         ENTRY;
 582
 583         if (rc)
 584                 GOTO(out, rc);
 585
 586         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 587         if (body == NULL) {
 588                 CERROR ("can't unpack ost_body\n");
 589                 GOTO(out, rc = -EPROTO);
 590         }
 591
 592         *aa->aa_oi->oi_oa = body->oa;
 593 out:
 594         rc = aa->aa_oi->oi_cb_up(aa->aa_oi, rc);
 595         RETURN(rc);
 596 }
 597
 598 static int osc_sync(struct obd_export *exp, struct obd_info *oinfo,
 599                     obd_size start, obd_size end,
 600                     struct ptlrpc_request_set *set)
 601 {
 602         struct ptlrpc_request *req;
 603         struct ost_body       *body;
 604         struct osc_async_args *aa;
 605         int                    rc;
 606         ENTRY;
 607
 608         if (!oinfo->oi_oa) {
 609                 CDEBUG(D_INFO, "oa NULL\n");
 610                 RETURN(-EINVAL);
 611         }
 612
 613         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_SYNC);
 614         if (req == NULL)
 615                 RETURN(-ENOMEM);
 616
 617         osc_set_capa_size(req, &RMF_CAPA1, oinfo->oi_capa);
 618         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SYNC);
 619         if (rc) {
 620                 ptlrpc_request_free(req);
 621                 RETURN(rc);
 622         }
 623
 624         /* overload the size and blocks fields in the oa with start/end */
 625         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 626         LASSERT(body);
 627         lustre_set_wire_obdo(&body->oa, oinfo->oi_oa);
 628         body->oa.o_size = start;
 629         body->oa.o_blocks = end;
 630         body->oa.o_valid |= (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS);
 631         osc_pack_capa(req, body, oinfo->oi_capa);
 632
 633         ptlrpc_request_set_replen(req);
 634         req->rq_interpret_reply = osc_sync_interpret;
 635
 636         CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
 637         aa = ptlrpc_req_async_args(req);
 638         aa->aa_oi = oinfo;
 639
 640         ptlrpc_set_add_req(set, req);
 641         RETURN (0);
 642 }
 643
 644 /* Find and cancel locally locks matched by @mode in the resource found by
 645  * @objid. Found locks are added into @cancel list. Returns the amount of
 646  * locks added to @cancels list. */
 647 static int osc_resource_get_unused(struct obd_export *exp, struct obdo *oa,
 648                                    cfs_list_t *cancels,
 649                                    ldlm_mode_t mode, int lock_flags)
 650 {
 651         struct ldlm_namespace *ns = exp->exp_obd->obd_namespace;
 652         struct ldlm_res_id res_id;
 653         struct ldlm_resource *res;
 654         int count;
 655         ENTRY;
 656
 657         osc_build_res_name(oa->o_id, oa->o_seq, &res_id);
 658         res = ldlm_resource_get(ns, NULL, &res_id, 0, 0);
 659         if (res == NULL)
 660                 RETURN(0);
 661
 662         LDLM_RESOURCE_ADDREF(res);
 663         count = ldlm_cancel_resource_local(res, cancels, NULL, mode,
 664                                            lock_flags, 0, NULL);
 665         LDLM_RESOURCE_DELREF(res);
 666         ldlm_resource_putref(res);
 667         RETURN(count);
 668 }
 669
 670 static int osc_destroy_interpret(const struct lu_env *env,
 671                                  struct ptlrpc_request *req, void *data,
 672                                  int rc)
 673 {
 674         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
 675
 676         cfs_atomic_dec(&cli->cl_destroy_in_flight);
 677         cfs_waitq_signal(&cli->cl_destroy_waitq);
 678         return 0;
 679 }
 680
 681 static int osc_can_send_destroy(struct client_obd *cli)
 682 {
 683         if (cfs_atomic_inc_return(&cli->cl_destroy_in_flight) <=
 684             cli->cl_max_rpcs_in_flight) {
 685                 /* The destroy request can be sent */
 686                 return 1;
 687         }
 688         if (cfs_atomic_dec_return(&cli->cl_destroy_in_flight) <
 689             cli->cl_max_rpcs_in_flight) {
 690                 /*
 691                  * The counter has been modified between the two atomic
 692                  * operations.
 693                  */
 694                 cfs_waitq_signal(&cli->cl_destroy_waitq);
 695         }
 696         return 0;
 697 }
 698
 699 /* Destroy requests can be async always on the client, and we don't even really
 700  * care about the return code since the client cannot do anything at all about
 701  * a destroy failure.
 702  * When the MDS is unlinking a filename, it saves the file objects into a
 703  * recovery llog, and these object records are cancelled when the OST reports
 704  * they were destroyed and sync'd to disk (i.e. transaction committed).
 705  * If the client dies, or the OST is down when the object should be destroyed,
 706  * the records are not cancelled, and when the OST reconnects to the MDS next,
 707  * it will retrieve the llog unlink logs and then sends the log cancellation
 708  * cookies to the MDS after committing destroy transactions. */
 709 static int osc_destroy(struct obd_export *exp, struct obdo *oa,
 710                        struct lov_stripe_md *ea, struct obd_trans_info *oti,
 711                        struct obd_export *md_export, void *capa)
 712 {
 713         struct client_obd     *cli = &exp->exp_obd->u.cli;
 714         struct ptlrpc_request *req;
 715         struct ost_body       *body;
 716         CFS_LIST_HEAD(cancels);
 717         int rc, count;
 718         ENTRY;
 719
 720         if (!oa) {
 721                 CDEBUG(D_INFO, "oa NULL\n");
 722                 RETURN(-EINVAL);
 723         }
 724
 725         count = osc_resource_get_unused(exp, oa, &cancels, LCK_PW,
 726                                         LDLM_FL_DISCARD_DATA);
 727
 728         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_DESTROY);
 729         if (req == NULL) {
 730                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
 731                 RETURN(-ENOMEM);
 732         }
 733
 734         osc_set_capa_size(req, &RMF_CAPA1, (struct obd_capa *)capa);
 735         rc = ldlm_prep_elc_req(exp, req, LUSTRE_OST_VERSION, OST_DESTROY,
 736                                0, &cancels, count);
 737         if (rc) {
 738                 ptlrpc_request_free(req);
 739                 RETURN(rc);
 740         }
 741
 742         req->rq_request_portal = OST_IO_PORTAL; /* bug 7198 */
 743         ptlrpc_at_set_req_timeout(req);
 744
 745         if (oti != NULL && oa->o_valid & OBD_MD_FLCOOKIE)
 746                 oa->o_lcookie = *oti->oti_logcookies;
 747         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 748         LASSERT(body);
 749         lustre_set_wire_obdo(&body->oa, oa);
 750
 751         osc_pack_capa(req, body, (struct obd_capa *)capa);
 752         ptlrpc_request_set_replen(req);
 753
 754         /* don't throttle destroy RPCs for the MDT */
 755         if (!(cli->cl_import->imp_connect_flags_orig & OBD_CONNECT_MDS)) {
 756                 req->rq_interpret_reply = osc_destroy_interpret;
 757                 if (!osc_can_send_destroy(cli)) {
 758                         struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP,
 759                                                           NULL);
 760
 761                         /*
 762                          * Wait until the number of on-going destroy RPCs drops
 763                          * under max_rpc_in_flight
 764                          */
 765                         l_wait_event_exclusive(cli->cl_destroy_waitq,
 766                                                osc_can_send_destroy(cli), &lwi);
 767                 }
 768         }
 769
 770         /* Do not wait for response */
 771         ptlrpcd_add_req(req, PSCOPE_OTHER);
 772         RETURN(0);
 773 }
 774
 775 static void osc_announce_cached(struct client_obd *cli, struct obdo *oa,
 776                                 long writing_bytes)
 777 {
 778         obd_flag bits = OBD_MD_FLBLOCKS|OBD_MD_FLGRANT;
 779
 780         LASSERT(!(oa->o_valid & bits));
 781
 782         oa->o_valid |= bits;
 783         client_obd_list_lock(&cli->cl_loi_list_lock);
 784         oa->o_dirty = cli->cl_dirty;
 785         if (cli->cl_dirty - cli->cl_dirty_transit > cli->cl_dirty_max) {
 786                 CERROR("dirty %lu - %lu > dirty_max %lu\n",
 787                        cli->cl_dirty, cli->cl_dirty_transit, cli->cl_dirty_max);
 788                 oa->o_undirty = 0;
 789         } else if (cfs_atomic_read(&obd_dirty_pages) -
 790                    cfs_atomic_read(&obd_dirty_transit_pages) >
 791                    obd_max_dirty_pages + 1){
 792                 /* The cfs_atomic_read() allowing the cfs_atomic_inc() are
 793                  * not covered by a lock thus they may safely race and trip
 794                  * this CERROR() unless we add in a small fudge factor (+1). */
 795                 CERROR("dirty %d - %d > system dirty_max %d\n",
 796                        cfs_atomic_read(&obd_dirty_pages),
 797                        cfs_atomic_read(&obd_dirty_transit_pages),
 798                        obd_max_dirty_pages);
 799                 oa->o_undirty = 0;
 800         } else if (cli->cl_dirty_max - cli->cl_dirty > 0x7fffffff) {
 801                 CERROR("dirty %lu - dirty_max %lu too big???\n",
 802                        cli->cl_dirty, cli->cl_dirty_max);
 803                 oa->o_undirty = 0;
 804         } else {
 805                 long max_in_flight = (cli->cl_max_pages_per_rpc << CFS_PAGE_SHIFT)*
 806                                 (cli->cl_max_rpcs_in_flight + 1);
 807                 oa->o_undirty = max(cli->cl_dirty_max, max_in_flight);
 808         }
 809         oa->o_grant = cli->cl_avail_grant;
 810         oa->o_dropped = cli->cl_lost_grant;
 811         cli->cl_lost_grant = 0;
 812         client_obd_list_unlock(&cli->cl_loi_list_lock);
 813         CDEBUG(D_CACHE,"dirty: "LPU64" undirty: %u dropped %u grant: "LPU64"\n",
 814                oa->o_dirty, oa->o_undirty, oa->o_dropped, oa->o_grant);
 815
 816 }
 817
 818 static void osc_update_next_shrink(struct client_obd *cli)
 819 {
 820         cli->cl_next_shrink_grant =
 821                 cfs_time_shift(cli->cl_grant_shrink_interval);
 822         CDEBUG(D_CACHE, "next time %ld to shrink grant \n",
 823                cli->cl_next_shrink_grant);
 824 }
 825
 826 /* caller must hold loi_list_lock */
 827 static void osc_consume_write_grant(struct client_obd *cli,
 828                                     struct brw_page *pga)
 829 {
 830         LASSERT_SPIN_LOCKED(&cli->cl_loi_list_lock.lock);
 831         LASSERT(!(pga->flag & OBD_BRW_FROM_GRANT));
 832         cfs_atomic_inc(&obd_dirty_pages);
 833         cli->cl_dirty += CFS_PAGE_SIZE;
 834         cli->cl_avail_grant -= CFS_PAGE_SIZE;
 835         pga->flag |= OBD_BRW_FROM_GRANT;
 836         CDEBUG(D_CACHE, "using %lu grant credits for brw %p page %p\n",
 837                CFS_PAGE_SIZE, pga, pga->pg);
 838         LASSERT(cli->cl_avail_grant >= 0);
 839         osc_update_next_shrink(cli);
 840 }
 841
 842 /* the companion to osc_consume_write_grant, called when a brw has completed.
 843  * must be called with the loi lock held. */
 844 static void osc_release_write_grant(struct client_obd *cli,
 845                                     struct brw_page *pga, int sent)
 846 {
 847         int blocksize = cli->cl_import->imp_obd->obd_osfs.os_bsize ? : 4096;
 848         ENTRY;
 849
 850         LASSERT_SPIN_LOCKED(&cli->cl_loi_list_lock.lock);
 851         if (!(pga->flag & OBD_BRW_FROM_GRANT)) {
 852                 EXIT;
 853                 return;
 854         }
 855
 856         pga->flag &= ~OBD_BRW_FROM_GRANT;
 857         cfs_atomic_dec(&obd_dirty_pages);
 858         cli->cl_dirty -= CFS_PAGE_SIZE;
 859         if (pga->flag & OBD_BRW_NOCACHE) {
 860                 pga->flag &= ~OBD_BRW_NOCACHE;
 861                 cfs_atomic_dec(&obd_dirty_transit_pages);
 862                 cli->cl_dirty_transit -= CFS_PAGE_SIZE;
 863         }
 864         if (!sent) {
 865                 cli->cl_lost_grant += CFS_PAGE_SIZE;
 866                 CDEBUG(D_CACHE, "lost grant: %lu avail grant: %lu dirty: %lu\n",
 867                        cli->cl_lost_grant, cli->cl_avail_grant, cli->cl_dirty);
 868         } else if (CFS_PAGE_SIZE != blocksize && pga->count != CFS_PAGE_SIZE) {
 869                 /* For short writes we shouldn't count parts of pages that
 870                  * span a whole block on the OST side, or our accounting goes
 871                  * wrong.  Should match the code in filter_grant_check. */
 872                 int offset = pga->off & ~CFS_PAGE_MASK;
 873                 int count = pga->count + (offset & (blocksize - 1));
 874                 int end = (offset + pga->count) & (blocksize - 1);
 875                 if (end)
 876                         count += blocksize - end;
 877
 878                 cli->cl_lost_grant += CFS_PAGE_SIZE - count;
 879                 CDEBUG(D_CACHE, "lost %lu grant: %lu avail: %lu dirty: %lu\n",
 880                        CFS_PAGE_SIZE - count, cli->cl_lost_grant,
 881                        cli->cl_avail_grant, cli->cl_dirty);
 882         }
 883
 884         EXIT;
 885 }
 886
 887 static unsigned long rpcs_in_flight(struct client_obd *cli)
 888 {
 889         return cli->cl_r_in_flight + cli->cl_w_in_flight;
 890 }
 891
 892 /* caller must hold loi_list_lock */
 893 void osc_wake_cache_waiters(struct client_obd *cli)
 894 {
 895         cfs_list_t *l, *tmp;
 896         struct osc_cache_waiter *ocw;
 897
 898         ENTRY;
 899         cfs_list_for_each_safe(l, tmp, &cli->cl_cache_waiters) {
 900                 /* if we can't dirty more, we must wait until some is written */
 901                 if ((cli->cl_dirty + CFS_PAGE_SIZE > cli->cl_dirty_max) ||
 902                    (cfs_atomic_read(&obd_dirty_pages) + 1 >
 903                     obd_max_dirty_pages)) {
 904                         CDEBUG(D_CACHE, "no dirty room: dirty: %ld "
 905                                "osc max %ld, sys max %d\n", cli->cl_dirty,
 906                                cli->cl_dirty_max, obd_max_dirty_pages);
 907                         return;
 908                 }
 909
 910                 /* if still dirty cache but no grant wait for pending RPCs that
 911                  * may yet return us some grant before doing sync writes */
 912                 if (cli->cl_w_in_flight && cli->cl_avail_grant < CFS_PAGE_SIZE) {
 913                         CDEBUG(D_CACHE, "%u BRW writes in flight, no grant\n",
 914                                cli->cl_w_in_flight);
 915                         return;
 916                 }
 917
 918                 ocw = cfs_list_entry(l, struct osc_cache_waiter, ocw_entry);
 919                 cfs_list_del_init(&ocw->ocw_entry);
 920                 if (cli->cl_avail_grant < CFS_PAGE_SIZE) {
 921                         /* no more RPCs in flight to return grant, do sync IO */
 922                         ocw->ocw_rc = -EDQUOT;
 923                         CDEBUG(D_INODE, "wake oap %p for sync\n", ocw->ocw_oap);
 924                 } else {
 925                         osc_consume_write_grant(cli,
 926                                                 &ocw->ocw_oap->oap_brw_page);
 927                 }
 928
 929                 cfs_waitq_signal(&ocw->ocw_waitq);
 930         }
 931
 932         EXIT;
 933 }
 934
 935 static void __osc_update_grant(struct client_obd *cli, obd_size grant)
 936 {
 937         client_obd_list_lock(&cli->cl_loi_list_lock);
 938         cli->cl_avail_grant += grant;
 939         client_obd_list_unlock(&cli->cl_loi_list_lock);
 940 }
 941
 942 static void osc_update_grant(struct client_obd *cli, struct ost_body *body)
 943 {
 944         if (body->oa.o_valid & OBD_MD_FLGRANT) {
 945                 CDEBUG(D_CACHE, "got "LPU64" extra grant\n", body->oa.o_grant);
 946                 __osc_update_grant(cli, body->oa.o_grant);
 947         }
 948 }
 949
 950 static int osc_set_info_async(struct obd_export *exp, obd_count keylen,
 951                               void *key, obd_count vallen, void *val,
 952                               struct ptlrpc_request_set *set);
 953
 954 static int osc_shrink_grant_interpret(const struct lu_env *env,
 955                                       struct ptlrpc_request *req,
 956                                       void *aa, int rc)
 957 {
 958         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
 959         struct obdo *oa = ((struct osc_grant_args *)aa)->aa_oa;
 960         struct ost_body *body;
 961
 962         if (rc != 0) {
 963                 __osc_update_grant(cli, oa->o_grant);
 964                 GOTO(out, rc);
 965         }
 966
 967         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 968         LASSERT(body);
 969         osc_update_grant(cli, body);
 970 out:
 971         OBDO_FREE(oa);
 972         return rc;
 973 }
 974
 975 static void osc_shrink_grant_local(struct client_obd *cli, struct obdo *oa)
 976 {
 977         client_obd_list_lock(&cli->cl_loi_list_lock);
 978         oa->o_grant = cli->cl_avail_grant / 4;
 979         cli->cl_avail_grant -= oa->o_grant;
 980         client_obd_list_unlock(&cli->cl_loi_list_lock);
 981         if (!(oa->o_valid & OBD_MD_FLFLAGS)) {
 982                 oa->o_valid |= OBD_MD_FLFLAGS;
 983                 oa->o_flags = 0;
 984         }
 985         oa->o_flags |= OBD_FL_SHRINK_GRANT;
 986         osc_update_next_shrink(cli);
 987 }
 988
 989 /* Shrink the current grant, either from some large amount to enough for a
 990  * full set of in-flight RPCs, or if we have already shrunk to that limit
 991  * then to enough for a single RPC.  This avoids keeping more grant than
 992  * needed, and avoids shrinking the grant piecemeal. */
 993 static int osc_shrink_grant(struct client_obd *cli)
 994 {
 995         long target = (cli->cl_max_rpcs_in_flight + 1) *
 996                       cli->cl_max_pages_per_rpc;
 997
 998         client_obd_list_lock(&cli->cl_loi_list_lock);
 999         if (cli->cl_avail_grant <= target)
1000                 target = cli->cl_max_pages_per_rpc;
1001         client_obd_list_unlock(&cli->cl_loi_list_lock);
1002
1003         return osc_shrink_grant_to_target(cli, target);
1004 }
1005
1006 int osc_shrink_grant_to_target(struct client_obd *cli, long target)
1007 {
1008         int    rc = 0;
1009         struct ost_body     *body;
1010         ENTRY;
1011
1012         client_obd_list_lock(&cli->cl_loi_list_lock);
1013         /* Don't shrink if we are already above or below the desired limit
1014          * We don't want to shrink below a single RPC, as that will negatively
1015          * impact block allocation and long-term performance. */
1016         if (target < cli->cl_max_pages_per_rpc)
1017                 target = cli->cl_max_pages_per_rpc;
1018
1019         if (target >= cli->cl_avail_grant) {
1020                 client_obd_list_unlock(&cli->cl_loi_list_lock);
1021                 RETURN(0);
1022         }
1023         client_obd_list_unlock(&cli->cl_loi_list_lock);
1024
1025         OBD_ALLOC_PTR(body);
1026         if (!body)
1027                 RETURN(-ENOMEM);
1028
1029         osc_announce_cached(cli, &body->oa, 0);
1030
1031         client_obd_list_lock(&cli->cl_loi_list_lock);
1032         body->oa.o_grant = cli->cl_avail_grant - target;
1033         cli->cl_avail_grant = target;
1034         client_obd_list_unlock(&cli->cl_loi_list_lock);
1035         if (!(body->oa.o_valid & OBD_MD_FLFLAGS)) {
1036                 body->oa.o_valid |= OBD_MD_FLFLAGS;
1037                 body->oa.o_flags = 0;
1038         }
1039         body->oa.o_flags |= OBD_FL_SHRINK_GRANT;
1040         osc_update_next_shrink(cli);
1041
1042         rc = osc_set_info_async(cli->cl_import->imp_obd->obd_self_export,
1043                                 sizeof(KEY_GRANT_SHRINK), KEY_GRANT_SHRINK,
1044                                 sizeof(*body), body, NULL);
1045         if (rc != 0)
1046                 __osc_update_grant(cli, body->oa.o_grant);
1047         OBD_FREE_PTR(body);
1048         RETURN(rc);
1049 }
1050
1051 #define GRANT_SHRINK_LIMIT PTLRPC_MAX_BRW_SIZE
1052 static int osc_should_shrink_grant(struct client_obd *client)
1053 {
1054         cfs_time_t time = cfs_time_current();
1055         cfs_time_t next_shrink = client->cl_next_shrink_grant;
1056
1057         if ((client->cl_import->imp_connect_data.ocd_connect_flags &
1058              OBD_CONNECT_GRANT_SHRINK) == 0)
1059                 return 0;
1060
1061         if (cfs_time_aftereq(time, next_shrink - 5 * CFS_TICK)) {
1062                 if (client->cl_import->imp_state == LUSTRE_IMP_FULL &&
1063                     client->cl_avail_grant > GRANT_SHRINK_LIMIT)
1064                         return 1;
1065                 else
1066                         osc_update_next_shrink(client);
1067         }
1068         return 0;
1069 }
1070
1071 static int osc_grant_shrink_grant_cb(struct timeout_item *item, void *data)
1072 {
1073         struct client_obd *client;
1074
1075         cfs_list_for_each_entry(client, &item->ti_obd_list,
1076                                 cl_grant_shrink_list) {
1077                 if (osc_should_shrink_grant(client))
1078                         osc_shrink_grant(client);
1079         }
1080         return 0;
1081 }
1082
1083 static int osc_add_shrink_grant(struct client_obd *client)
1084 {
1085         int rc;
1086
1087         rc = ptlrpc_add_timeout_client(client->cl_grant_shrink_interval,
1088                                        TIMEOUT_GRANT,
1089                                        osc_grant_shrink_grant_cb, NULL,
1090                                        &client->cl_grant_shrink_list);
1091         if (rc) {
1092                 CERROR("add grant client %s error %d\n",
1093                         client->cl_import->imp_obd->obd_name, rc);
1094                 return rc;
1095         }
1096         CDEBUG(D_CACHE, "add grant client %s \n",
1097                client->cl_import->imp_obd->obd_name);
1098         osc_update_next_shrink(client);
1099         return 0;
1100 }
1101
1102 static int osc_del_shrink_grant(struct client_obd *client)
1103 {
1104         return ptlrpc_del_timeout_client(&client->cl_grant_shrink_list,
1105                                          TIMEOUT_GRANT);
1106 }
1107
1108 static void osc_init_grant(struct client_obd *cli, struct obd_connect_data *ocd)
1109 {
1110         /*
1111          * ocd_grant is the total grant amount we're expect to hold: if we've
1112          * been evicted, it's the new avail_grant amount, cl_dirty will drop
1113          * to 0 as inflight RPCs fail out; otherwise, it's avail_grant + dirty.
1114          *
1115          * race is tolerable here: if we're evicted, but imp_state already
1116          * left EVICTED state, then cl_dirty must be 0 already.
1117          */
1118         client_obd_list_lock(&cli->cl_loi_list_lock);
1119         if (cli->cl_import->imp_state == LUSTRE_IMP_EVICTED)
1120                 cli->cl_avail_grant = ocd->ocd_grant;
1121         else
1122                 cli->cl_avail_grant = ocd->ocd_grant - cli->cl_dirty;
1123
1124         if (cli->cl_avail_grant < 0) {
1125                 CWARN("%s: available grant < 0, the OSS is probably not running"
1126                       " with patch from bug20278 (%ld) \n",
1127                       cli->cl_import->imp_obd->obd_name, cli->cl_avail_grant);
1128                 /* workaround for 1.6 servers which do not have
1129                  * the patch from bug20278 */
1130                 cli->cl_avail_grant = ocd->ocd_grant;
1131         }
1132
1133         client_obd_list_unlock(&cli->cl_loi_list_lock);
1134
1135         CDEBUG(D_CACHE, "%s, setting cl_avail_grant: %ld cl_lost_grant: %ld \n",
1136                cli->cl_import->imp_obd->obd_name,
1137                cli->cl_avail_grant, cli->cl_lost_grant);
1138
1139         if (ocd->ocd_connect_flags & OBD_CONNECT_GRANT_SHRINK &&
1140             cfs_list_empty(&cli->cl_grant_shrink_list))
1141                 osc_add_shrink_grant(cli);
1142 }
1143
1144 /* We assume that the reason this OSC got a short read is because it read
1145  * beyond the end of a stripe file; i.e. lustre is reading a sparse file
1146  * via the LOV, and it _knows_ it's reading inside the file, it's just that
1147  * this stripe never got written at or beyond this stripe offset yet. */
1148 static void handle_short_read(int nob_read, obd_count page_count,
1149                               struct brw_page **pga)
1150 {
1151         char *ptr;
1152         int i = 0;
1153
1154         /* skip bytes read OK */
1155         while (nob_read > 0) {
1156                 LASSERT (page_count > 0);
1157
1158                 if (pga[i]->count > nob_read) {
1159                         /* EOF inside this page */
1160                         ptr = cfs_kmap(pga[i]->pg) +
1161                                 (pga[i]->off & ~CFS_PAGE_MASK);
1162                         memset(ptr + nob_read, 0, pga[i]->count - nob_read);
1163                         cfs_kunmap(pga[i]->pg);
1164                         page_count--;
1165                         i++;
1166                         break;
1167                 }
1168
1169                 nob_read -= pga[i]->count;
1170                 page_count--;
1171                 i++;
1172         }
1173
1174         /* zero remaining pages */
1175         while (page_count-- > 0) {
1176                 ptr = cfs_kmap(pga[i]->pg) + (pga[i]->off & ~CFS_PAGE_MASK);
1177                 memset(ptr, 0, pga[i]->count);
1178                 cfs_kunmap(pga[i]->pg);
1179                 i++;
1180         }
1181 }
1182
1183 static int check_write_rcs(struct ptlrpc_request *req,
1184                            int requested_nob, int niocount,
1185                            obd_count page_count, struct brw_page **pga)
1186 {
1187         int     i;
1188         __u32   *remote_rcs;
1189
1190         remote_rcs = req_capsule_server_sized_get(&req->rq_pill, &RMF_RCS,
1191                                                   sizeof(*remote_rcs) *
1192                                                   niocount);
1193         if (remote_rcs == NULL) {
1194                 CDEBUG(D_INFO, "Missing/short RC vector on BRW_WRITE reply\n");
1195                 return(-EPROTO);
1196         }
1197
1198         /* return error if any niobuf was in error */
1199         for (i = 0; i < niocount; i++) {
1200                 if ((int)remote_rcs[i] < 0)
1201                         return(remote_rcs[i]);
1202
1203                 if (remote_rcs[i] != 0) {
1204                         CDEBUG(D_INFO, "rc[%d] invalid (%d) req %p\n",
1205                                 i, remote_rcs[i], req);
1206                         return(-EPROTO);
1207                 }
1208         }
1209
1210         if (req->rq_bulk->bd_nob_transferred != requested_nob) {
1211                 CERROR("Unexpected # bytes transferred: %d (requested %d)\n",
1212                        req->rq_bulk->bd_nob_transferred, requested_nob);
1213                 return(-EPROTO);
1214         }
1215
1216         return (0);
1217 }
1218
1219 static inline int can_merge_pages(struct brw_page *p1, struct brw_page *p2)
1220 {
1221         if (p1->flag != p2->flag) {
1222                 unsigned mask = ~(OBD_BRW_FROM_GRANT|
1223                                   OBD_BRW_NOCACHE|OBD_BRW_SYNC|OBD_BRW_ASYNC);
1224
1225                 /* warn if we try to combine flags that we don't know to be
1226                  * safe to combine */
1227                 if ((p1->flag & mask) != (p2->flag & mask))
1228                         CERROR("is it ok to have flags 0x%x and 0x%x in the "
1229                                "same brw?\n", p1->flag, p2->flag);
1230                 return 0;
1231         }
1232
1233         return (p1->off + p1->count == p2->off);
1234 }
1235
1236 static obd_count osc_checksum_bulk(int nob, obd_count pg_count,
1237                                    struct brw_page **pga, int opc,
1238                                    cksum_type_t cksum_type)
1239 {
1240         __u32 cksum;
1241         int i = 0;
1242
1243         LASSERT (pg_count > 0);
1244         cksum = init_checksum(cksum_type);
1245         while (nob > 0 && pg_count > 0) {
1246                 unsigned char *ptr = cfs_kmap(pga[i]->pg);
1247                 int off = pga[i]->off & ~CFS_PAGE_MASK;
1248                 int count = pga[i]->count > nob ? nob : pga[i]->count;
1249
1250                 /* corrupt the data before we compute the checksum, to
1251                  * simulate an OST->client data error */
1252                 if (i == 0 && opc == OST_READ &&
1253                     OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_RECEIVE))
1254                         memcpy(ptr + off, "bad1", min(4, nob));
1255                 cksum = compute_checksum(cksum, ptr + off, count, cksum_type);
1256                 cfs_kunmap(pga[i]->pg);
1257                 LL_CDEBUG_PAGE(D_PAGE, pga[i]->pg, "off %d checksum %x\n",
1258                                off, cksum);
1259
1260                 nob -= pga[i]->count;
1261                 pg_count--;
1262                 i++;
1263         }
1264         /* For sending we only compute the wrong checksum instead
1265          * of corrupting the data so it is still correct on a redo */
1266         if (opc == OST_WRITE && OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_SEND))
1267                 cksum++;
1268
1269         return cksum;
1270 }
1271
1272 static int osc_brw_prep_request(int cmd, struct client_obd *cli,struct obdo *oa,
1273                                 struct lov_stripe_md *lsm, obd_count page_count,
1274                                 struct brw_page **pga,
1275                                 struct ptlrpc_request **reqp,
1276                                 struct obd_capa *ocapa, int reserve,
1277                                 int resend)
1278 {
1279         struct ptlrpc_request   *req;
1280         struct ptlrpc_bulk_desc *desc;
1281         struct ost_body         *body;
1282         struct obd_ioobj        *ioobj;
1283         struct niobuf_remote    *niobuf;
1284         int niocount, i, requested_nob, opc, rc;
1285         struct osc_brw_async_args *aa;
1286         struct req_capsule      *pill;
1287         struct brw_page *pg_prev;
1288
1289         ENTRY;
1290         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_BRW_PREP_REQ))
1291                 RETURN(-ENOMEM); /* Recoverable */
1292         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_BRW_PREP_REQ2))
1293                 RETURN(-EINVAL); /* Fatal */
1294
1295         if ((cmd & OBD_BRW_WRITE) != 0) {
1296                 opc = OST_WRITE;
1297                 req = ptlrpc_request_alloc_pool(cli->cl_import,
1298                                                 cli->cl_import->imp_rq_pool,
1299                                                 &RQF_OST_BRW_WRITE);
1300         } else {
1301                 opc = OST_READ;
1302                 req = ptlrpc_request_alloc(cli->cl_import, &RQF_OST_BRW_READ);
1303         }
1304         if (req == NULL)
1305                 RETURN(-ENOMEM);
1306
1307         for (niocount = i = 1; i < page_count; i++) {
1308                 if (!can_merge_pages(pga[i - 1], pga[i]))
1309                         niocount++;
1310         }
1311
1312         pill = &req->rq_pill;
1313         req_capsule_set_size(pill, &RMF_OBD_IOOBJ, RCL_CLIENT,
1314                              sizeof(*ioobj));
1315         req_capsule_set_size(pill, &RMF_NIOBUF_REMOTE, RCL_CLIENT,
1316                              niocount * sizeof(*niobuf));
1317         osc_set_capa_size(req, &RMF_CAPA1, ocapa);
1318
1319         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, opc);
1320         if (rc) {
1321                 ptlrpc_request_free(req);
1322                 RETURN(rc);
1323         }
1324         req->rq_request_portal = OST_IO_PORTAL; /* bug 7198 */
1325         ptlrpc_at_set_req_timeout(req);
1326
1327         if (opc == OST_WRITE)
1328                 desc = ptlrpc_prep_bulk_imp(req, page_count,
1329                                             BULK_GET_SOURCE, OST_BULK_PORTAL);
1330         else
1331                 desc = ptlrpc_prep_bulk_imp(req, page_count,
1332                                             BULK_PUT_SINK, OST_BULK_PORTAL);
1333
1334         if (desc == NULL)
1335                 GOTO(out, rc = -ENOMEM);
1336         /* NB request now owns desc and will free it when it gets freed */
1337
1338         body = req_capsule_client_get(pill, &RMF_OST_BODY);
1339         ioobj = req_capsule_client_get(pill, &RMF_OBD_IOOBJ);
1340         niobuf = req_capsule_client_get(pill, &RMF_NIOBUF_REMOTE);
1341         LASSERT(body != NULL && ioobj != NULL && niobuf != NULL);
1342
1343         lustre_set_wire_obdo(&body->oa, oa);
1344
1345         obdo_to_ioobj(oa, ioobj);
1346         ioobj->ioo_bufcnt = niocount;
1347         osc_pack_capa(req, body, ocapa);
1348         LASSERT (page_count > 0);
1349         pg_prev = pga[0];
1350         for (requested_nob = i = 0; i < page_count; i++, niobuf++) {
1351                 struct brw_page *pg = pga[i];
1352
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         obd_off starting_offset = OBD_OBJECT_EOF;
2440         int starting_page_off = 0;
2441         int srvlock = 0, mem_tight = 0;
2442         struct cl_object *clob = NULL;
2443         ENTRY;
2444
2445         /* ASYNC_HP pages first. At present, when the lock the pages is
2446          * to be canceled, the pages covered by the lock will be sent out
2447          * with ASYNC_HP. We have to send out them as soon as possible. */
2448         cfs_list_for_each_entry_safe(oap, tmp, &lop->lop_urgent, oap_urgent_item) {
2449                 if (oap->oap_async_flags & ASYNC_HP)
2450                         cfs_list_move(&oap->oap_pending_item, &tmp_list);
2451                 else
2452                         cfs_list_move_tail(&oap->oap_pending_item, &tmp_list);
2453                 if (++page_count >= cli->cl_max_pages_per_rpc)
2454                         break;
2455         }
2456
2457         cfs_list_splice(&tmp_list, &lop->lop_pending);
2458         page_count = 0;
2459
2460         /* first we find the pages we're allowed to work with */
2461         cfs_list_for_each_entry_safe(oap, tmp, &lop->lop_pending,
2462                                      oap_pending_item) {
2463                 ops = oap->oap_caller_ops;
2464
2465                 LASSERTF(oap->oap_magic == OAP_MAGIC, "Bad oap magic: oap %p, "
2466                          "magic 0x%x\n", oap, oap->oap_magic);
2467
2468                 if (clob == NULL) {
2469                         /* pin object in memory, so that completion call-backs
2470                          * can be safely called under client_obd_list lock. */
2471                         clob = osc_oap2cl_page(oap)->cp_obj;
2472                         cl_object_get(clob);
2473                 }
2474
2475                 if (page_count != 0 &&
2476                     srvlock != !!(oap->oap_brw_flags & OBD_BRW_SRVLOCK)) {
2477                         CDEBUG(D_PAGE, "SRVLOCK flag mismatch,"
2478                                " oap %p, page %p, srvlock %u\n",
2479                                oap, oap->oap_brw_page.pg, (unsigned)!srvlock);
2480                         break;
2481                 }
2482
2483                 /* If there is a gap at the start of this page, it can't merge
2484                  * with any previous page, so we'll hand the network a
2485                  * "fragmented" page array that it can't transfer in 1 RDMA */
2486                 if (oap->oap_obj_off < starting_offset) {
2487                         if (starting_page_off != 0)
2488                                 break;
2489
2490                         starting_page_off = oap->oap_page_off;
2491                         starting_offset = oap->oap_obj_off + starting_page_off;
2492                 } else if (oap->oap_page_off != 0)
2493                         break;
2494
2495                 /* in llite being 'ready' equates to the page being locked
2496                  * until completion unlocks it.  commit_write submits a page
2497                  * as not ready because its unlock will happen unconditionally
2498                  * as the call returns.  if we race with commit_write giving
2499                  * us that page we don't want to create a hole in the page
2500                  * stream, so we stop and leave the rpc to be fired by
2501                  * another dirtier or kupdated interval (the not ready page
2502                  * will still be on the dirty list).  we could call in
2503                  * at the end of ll_file_write to process the queue again. */
2504                 if (!(oap->oap_async_flags & ASYNC_READY)) {
2505                         int rc = ops->ap_make_ready(env, oap->oap_caller_data,
2506                                                     cmd);
2507                         if (rc < 0)
2508                                 CDEBUG(D_INODE, "oap %p page %p returned %d "
2509                                                 "instead of ready\n", oap,
2510                                                 oap->oap_page, rc);
2511                         switch (rc) {
2512                         case -EAGAIN:
2513                                 /* llite is telling us that the page is still
2514                                  * in commit_write and that we should try
2515                                  * and put it in an rpc again later.  we
2516                                  * break out of the loop so we don't create
2517                                  * a hole in the sequence of pages in the rpc
2518                                  * stream.*/
2519                                 oap = NULL;
2520                                 break;
2521                         case -EINTR:
2522                                 /* the io isn't needed.. tell the checks
2523                                  * below to complete the rpc with EINTR */
2524                                 cfs_spin_lock(&oap->oap_lock);
2525                                 oap->oap_async_flags |= ASYNC_COUNT_STABLE;
2526                                 cfs_spin_unlock(&oap->oap_lock);
2527                                 oap->oap_count = -EINTR;
2528                                 break;
2529                         case 0:
2530                                 cfs_spin_lock(&oap->oap_lock);
2531                                 oap->oap_async_flags |= ASYNC_READY;
2532                                 cfs_spin_unlock(&oap->oap_lock);
2533                                 break;
2534                         default:
2535                                 LASSERTF(0, "oap %p page %p returned %d "
2536                                             "from make_ready\n", oap,
2537                                             oap->oap_page, rc);
2538                                 break;
2539                         }
2540                 }
2541                 if (oap == NULL)
2542                         break;
2543                 /*
2544                  * Page submitted for IO has to be locked. Either by
2545                  * ->ap_make_ready() or by higher layers.
2546                  */
2547 #if defined(__KERNEL__) && defined(__linux__)
2548                 {
2549                         struct cl_page *page;
2550
2551                         page = osc_oap2cl_page(oap);
2552
2553                         if (page->cp_type == CPT_CACHEABLE &&
2554                             !(PageLocked(oap->oap_page) &&
2555                               (CheckWriteback(oap->oap_page, cmd)))) {
2556                                 CDEBUG(D_PAGE, "page %p lost wb %lx/%x\n",
2557                                        oap->oap_page,
2558                                        (long)oap->oap_page->flags,
2559                                        oap->oap_async_flags);
2560                                 LBUG();
2561                         }
2562                 }
2563 #endif
2564
2565                 /* take the page out of our book-keeping */
2566                 cfs_list_del_init(&oap->oap_pending_item);
2567                 lop_update_pending(cli, lop, cmd, -1);
2568                 cfs_list_del_init(&oap->oap_urgent_item);
2569
2570                 /* ask the caller for the size of the io as the rpc leaves. */
2571                 if (!(oap->oap_async_flags & ASYNC_COUNT_STABLE)) {
2572                         oap->oap_count =
2573                                 ops->ap_refresh_count(env, oap->oap_caller_data,
2574                                                       cmd);
2575                         LASSERT(oap->oap_page_off + oap->oap_count <= CFS_PAGE_SIZE);
2576                 }
2577                 if (oap->oap_count <= 0) {
2578                         CDEBUG(D_CACHE, "oap %p count %d, completing\n", oap,
2579                                oap->oap_count);
2580                         osc_ap_completion(env, cli, NULL,
2581                                           oap, 0, oap->oap_count);
2582                         continue;
2583                 }
2584
2585                 /* now put the page back in our accounting */
2586                 cfs_list_add_tail(&oap->oap_rpc_item, &rpc_list);
2587                 if (oap->oap_brw_flags & OBD_BRW_MEMALLOC)
2588                         mem_tight = 1;
2589                 if (page_count == 0)
2590                         srvlock = !!(oap->oap_brw_flags & OBD_BRW_SRVLOCK);
2591                 if (++page_count >= cli->cl_max_pages_per_rpc)
2592                         break;
2593
2594                 /* End on a PTLRPC_MAX_BRW_SIZE boundary.  We want full-sized
2595                  * RPCs aligned on PTLRPC_MAX_BRW_SIZE boundaries to help reads
2596                  * have the same alignment as the initial writes that allocated
2597                  * extents on the server. */
2598                 ending_offset = (oap->oap_obj_off + oap->oap_page_off +
2599                                  oap->oap_count) & (PTLRPC_MAX_BRW_SIZE - 1);
2600                 if (ending_offset == 0)
2601                         break;
2602
2603                 /* If there is a gap at the end of this page, it can't merge
2604                  * with any subsequent pages, so we'll hand the network a
2605                  * "fragmented" page array that it can't transfer in 1 RDMA */
2606                 if (oap->oap_page_off + oap->oap_count < CFS_PAGE_SIZE)
2607                         break;
2608         }
2609
2610         osc_wake_cache_waiters(cli);
2611
2612         loi_list_maint(cli, loi);
2613
2614         client_obd_list_unlock(&cli->cl_loi_list_lock);
2615
2616         if (clob != NULL)
2617                 cl_object_put(env, clob);
2618
2619         if (page_count == 0) {
2620                 client_obd_list_lock(&cli->cl_loi_list_lock);
2621                 RETURN(0);
2622         }
2623
2624         req = osc_build_req(env, cli, &rpc_list, page_count,
2625                             mem_tight ? (cmd | OBD_BRW_MEMALLOC) : cmd);
2626         if (IS_ERR(req)) {
2627                 LASSERT(cfs_list_empty(&rpc_list));
2628                 loi_list_maint(cli, loi);
2629                 RETURN(PTR_ERR(req));
2630         }
2631
2632         aa = ptlrpc_req_async_args(req);
2633
2634         starting_offset &= PTLRPC_MAX_BRW_SIZE - 1;
2635         if (cmd == OBD_BRW_READ) {
2636                 lprocfs_oh_tally_log2(&cli->cl_read_page_hist, page_count);
2637                 lprocfs_oh_tally(&cli->cl_read_rpc_hist, cli->cl_r_in_flight);
2638                 lprocfs_oh_tally_log2(&cli->cl_read_offset_hist,
2639                                       (starting_offset >> CFS_PAGE_SHIFT) + 1);
2640         } else {
2641                 lprocfs_oh_tally_log2(&cli->cl_write_page_hist, page_count);
2642                 lprocfs_oh_tally(&cli->cl_write_rpc_hist,
2643                                  cli->cl_w_in_flight);
2644                 lprocfs_oh_tally_log2(&cli->cl_write_offset_hist,
2645                                       (starting_offset >> CFS_PAGE_SHIFT) + 1);
2646         }
2647         ptlrpc_lprocfs_brw(req, aa->aa_requested_nob);
2648
2649         client_obd_list_lock(&cli->cl_loi_list_lock);
2650
2651         if (cmd == OBD_BRW_READ)
2652                 cli->cl_r_in_flight++;
2653         else
2654                 cli->cl_w_in_flight++;
2655
2656         /* queued sync pages can be torn down while the pages
2657          * were between the pending list and the rpc */
2658         tmp = NULL;
2659         cfs_list_for_each_entry(oap, &aa->aa_oaps, oap_rpc_item) {
2660                 /* only one oap gets a request reference */
2661                 if (tmp == NULL)
2662                         tmp = oap;
2663                 if (oap->oap_interrupted && !req->rq_intr) {
2664                         CDEBUG(D_INODE, "oap %p in req %p interrupted\n",
2665                                oap, req);
2666                         ptlrpc_mark_interrupted(req);
2667                 }
2668         }
2669         if (tmp != NULL)
2670                 tmp->oap_request = ptlrpc_request_addref(req);
2671
2672         DEBUG_REQ(D_INODE, req, "%d pages, aa %p. now %dr/%dw in flight",
2673                   page_count, aa, cli->cl_r_in_flight, cli->cl_w_in_flight);
2674
2675         req->rq_interpret_reply = brw_interpret;
2676         ptlrpcd_add_req(req, PSCOPE_BRW);
2677         RETURN(1);
2678 }
2679
2680 #define LOI_DEBUG(LOI, STR, args...)                                     \
2681         CDEBUG(D_INODE, "loi ready %d wr %d:%d rd %d:%d " STR,           \
2682                !cfs_list_empty(&(LOI)->loi_ready_item) ||                \
2683                !cfs_list_empty(&(LOI)->loi_hp_ready_item),               \
2684                (LOI)->loi_write_lop.lop_num_pending,                     \
2685                !cfs_list_empty(&(LOI)->loi_write_lop.lop_urgent),        \
2686                (LOI)->loi_read_lop.lop_num_pending,                      \
2687                !cfs_list_empty(&(LOI)->loi_read_lop.lop_urgent),         \
2688                args)                                                     \
2689
2690 /* This is called by osc_check_rpcs() to find which objects have pages that
2691  * we could be sending.  These lists are maintained by lop_makes_rpc(). */
2692 struct lov_oinfo *osc_next_loi(struct client_obd *cli)
2693 {
2694         ENTRY;
2695
2696         /* First return objects that have blocked locks so that they
2697          * will be flushed quickly and other clients can get the lock,
2698          * then objects which have pages ready to be stuffed into RPCs */
2699         if (!cfs_list_empty(&cli->cl_loi_hp_ready_list))
2700                 RETURN(cfs_list_entry(cli->cl_loi_hp_ready_list.next,
2701                                       struct lov_oinfo, loi_hp_ready_item));
2702         if (!cfs_list_empty(&cli->cl_loi_ready_list))
2703                 RETURN(cfs_list_entry(cli->cl_loi_ready_list.next,
2704                                       struct lov_oinfo, loi_ready_item));
2705
2706         /* then if we have cache waiters, return all objects with queued
2707          * writes.  This is especially important when many small files
2708          * have filled up the cache and not been fired into rpcs because
2709          * they don't pass the nr_pending/object threshhold */
2710         if (!cfs_list_empty(&cli->cl_cache_waiters) &&
2711             !cfs_list_empty(&cli->cl_loi_write_list))
2712                 RETURN(cfs_list_entry(cli->cl_loi_write_list.next,
2713                                       struct lov_oinfo, loi_write_item));
2714
2715         /* then return all queued objects when we have an invalid import
2716          * so that they get flushed */
2717         if (cli->cl_import == NULL || cli->cl_import->imp_invalid) {
2718                 if (!cfs_list_empty(&cli->cl_loi_write_list))
2719                         RETURN(cfs_list_entry(cli->cl_loi_write_list.next,
2720                                               struct lov_oinfo,
2721                                               loi_write_item));
2722                 if (!cfs_list_empty(&cli->cl_loi_read_list))
2723                         RETURN(cfs_list_entry(cli->cl_loi_read_list.next,
2724                                               struct lov_oinfo, loi_read_item));
2725         }
2726         RETURN(NULL);
2727 }
2728
2729 static int osc_max_rpc_in_flight(struct client_obd *cli, struct lov_oinfo *loi)
2730 {
2731         struct osc_async_page *oap;
2732         int hprpc = 0;
2733
2734         if (!cfs_list_empty(&loi->loi_write_lop.lop_urgent)) {
2735                 oap = cfs_list_entry(loi->loi_write_lop.lop_urgent.next,
2736                                      struct osc_async_page, oap_urgent_item);
2737                 hprpc = !!(oap->oap_async_flags & ASYNC_HP);
2738         }
2739
2740         if (!hprpc && !cfs_list_empty(&loi->loi_read_lop.lop_urgent)) {
2741                 oap = cfs_list_entry(loi->loi_read_lop.lop_urgent.next,
2742                                      struct osc_async_page, oap_urgent_item);
2743                 hprpc = !!(oap->oap_async_flags & ASYNC_HP);
2744         }
2745
2746         return rpcs_in_flight(cli) >= cli->cl_max_rpcs_in_flight + hprpc;
2747 }
2748
2749 /* called with the loi list lock held */
2750 void osc_check_rpcs(const struct lu_env *env, struct client_obd *cli)
2751 {
2752         struct lov_oinfo *loi;
2753         int rc = 0, race_counter = 0;
2754         ENTRY;
2755
2756         while ((loi = osc_next_loi(cli)) != NULL) {
2757                 LOI_DEBUG(loi, "%lu in flight\n", rpcs_in_flight(cli));
2758
2759                 if (osc_max_rpc_in_flight(cli, loi))
2760                         break;
2761
2762                 /* attempt some read/write balancing by alternating between
2763                  * reads and writes in an object.  The makes_rpc checks here
2764                  * would be redundant if we were getting read/write work items
2765                  * instead of objects.  we don't want send_oap_rpc to drain a
2766                  * partial read pending queue when we're given this object to
2767                  * do io on writes while there are cache waiters */
2768                 if (lop_makes_rpc(cli, &loi->loi_write_lop, OBD_BRW_WRITE)) {
2769                         rc = osc_send_oap_rpc(env, cli, loi, OBD_BRW_WRITE,
2770                                               &loi->loi_write_lop);
2771                         if (rc < 0) {
2772                                 CERROR("Write request failed with %d\n", rc);
2773
2774                                 /* osc_send_oap_rpc failed, mostly because of
2775                                  * memory pressure.
2776                                  *
2777                                  * It can't break here, because if:
2778                                  *  - a page was submitted by osc_io_submit, so
2779                                  *    page locked;
2780                                  *  - no request in flight
2781                                  *  - no subsequent request
2782                                  * The system will be in live-lock state,
2783                                  * because there is no chance to call
2784                                  * osc_io_unplug() and osc_check_rpcs() any
2785                                  * more. pdflush can't help in this case,
2786                                  * because it might be blocked at grabbing
2787                                  * the page lock as we mentioned.
2788                                  *
2789                                  * Anyway, continue to drain pages. */
2790                                 /* break; */
2791                         }
2792
2793                         if (rc > 0)
2794                                 race_counter = 0;
2795                         else
2796                                 race_counter++;
2797                 }
2798                 if (lop_makes_rpc(cli, &loi->loi_read_lop, OBD_BRW_READ)) {
2799                         rc = osc_send_oap_rpc(env, cli, loi, OBD_BRW_READ,
2800                                               &loi->loi_read_lop);
2801                         if (rc < 0)
2802                                 CERROR("Read request failed with %d\n", rc);
2803
2804                         if (rc > 0)
2805                                 race_counter = 0;
2806                         else
2807                                 race_counter++;
2808                 }
2809
2810                 /* attempt some inter-object balancing by issuing rpcs
2811                  * for each object in turn */
2812                 if (!cfs_list_empty(&loi->loi_hp_ready_item))
2813                         cfs_list_del_init(&loi->loi_hp_ready_item);
2814                 if (!cfs_list_empty(&loi->loi_ready_item))
2815                         cfs_list_del_init(&loi->loi_ready_item);
2816                 if (!cfs_list_empty(&loi->loi_write_item))
2817                         cfs_list_del_init(&loi->loi_write_item);
2818                 if (!cfs_list_empty(&loi->loi_read_item))
2819                         cfs_list_del_init(&loi->loi_read_item);
2820
2821                 loi_list_maint(cli, loi);
2822
2823                 /* send_oap_rpc fails with 0 when make_ready tells it to
2824                  * back off.  llite's make_ready does this when it tries
2825                  * to lock a page queued for write that is already locked.
2826                  * we want to try sending rpcs from many objects, but we
2827                  * don't want to spin failing with 0.  */
2828                 if (race_counter == 10)
2829                         break;
2830         }
2831         EXIT;
2832 }
2833
2834 /* we're trying to queue a page in the osc so we're subject to the
2835  * 'cl_dirty_max' limit on the number of pages that can be queued in the osc.
2836  * If the osc's queued pages are already at that limit, then we want to sleep
2837  * until there is space in the osc's queue for us.  We also may be waiting for
2838  * write credits from the OST if there are RPCs in flight that may return some
2839  * before we fall back to sync writes.
2840  *
2841  * We need this know our allocation was granted in the presence of signals */
2842 static int ocw_granted(struct client_obd *cli, struct osc_cache_waiter *ocw)
2843 {
2844         int rc;
2845         ENTRY;
2846         client_obd_list_lock(&cli->cl_loi_list_lock);
2847         rc = cfs_list_empty(&ocw->ocw_entry) || rpcs_in_flight(cli) == 0;
2848         client_obd_list_unlock(&cli->cl_loi_list_lock);
2849         RETURN(rc);
2850 };
2851
2852 /**
2853  * Non-blocking version of osc_enter_cache() that consumes grant only when it
2854  * is available.
2855  */
2856 int osc_enter_cache_try(const struct lu_env *env,
2857                         struct client_obd *cli, struct lov_oinfo *loi,
2858                         struct osc_async_page *oap, int transient)
2859 {
2860         int has_grant;
2861
2862         has_grant = cli->cl_avail_grant >= CFS_PAGE_SIZE;
2863         if (has_grant) {
2864                 osc_consume_write_grant(cli, &oap->oap_brw_page);
2865                 if (transient) {
2866                         cli->cl_dirty_transit += CFS_PAGE_SIZE;
2867                         cfs_atomic_inc(&obd_dirty_transit_pages);
2868                         oap->oap_brw_flags |= OBD_BRW_NOCACHE;
2869                 }
2870         }
2871         return has_grant;
2872 }
2873
2874 /* Caller must hold loi_list_lock - we drop/regain it if we need to wait for
2875  * grant or cache space. */
2876 static int osc_enter_cache(const struct lu_env *env,
2877                            struct client_obd *cli, struct lov_oinfo *loi,
2878                            struct osc_async_page *oap)
2879 {
2880         struct osc_cache_waiter ocw;
2881         struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
2882
2883         ENTRY;
2884
2885         CDEBUG(D_CACHE, "dirty: %ld/%d dirty_max: %ld/%d dropped: %lu "
2886                "grant: %lu\n", cli->cl_dirty, cfs_atomic_read(&obd_dirty_pages),
2887                cli->cl_dirty_max, obd_max_dirty_pages,
2888                cli->cl_lost_grant, cli->cl_avail_grant);
2889
2890         /* force the caller to try sync io.  this can jump the list
2891          * of queued writes and create a discontiguous rpc stream */
2892         if (cli->cl_dirty_max < CFS_PAGE_SIZE || cli->cl_ar.ar_force_sync ||
2893             loi->loi_ar.ar_force_sync)
2894                 RETURN(-EDQUOT);
2895
2896         /* Hopefully normal case - cache space and write credits available */
2897         if (cli->cl_dirty + CFS_PAGE_SIZE <= cli->cl_dirty_max &&
2898             cfs_atomic_read(&obd_dirty_pages) + 1 <= obd_max_dirty_pages &&
2899             osc_enter_cache_try(env, cli, loi, oap, 0))
2900                 RETURN(0);
2901
2902         /* It is safe to block as a cache waiter as long as there is grant
2903          * space available or the hope of additional grant being returned
2904          * when an in flight write completes.  Using the write back cache
2905          * if possible is preferable to sending the data synchronously
2906          * because write pages can then be merged in to large requests.
2907          * The addition of this cache waiter will causing pending write
2908          * pages to be sent immediately. */
2909         if (cli->cl_w_in_flight || cli->cl_avail_grant >= CFS_PAGE_SIZE) {
2910                 cfs_list_add_tail(&ocw.ocw_entry, &cli->cl_cache_waiters);
2911                 cfs_waitq_init(&ocw.ocw_waitq);
2912                 ocw.ocw_oap = oap;
2913                 ocw.ocw_rc = 0;
2914
2915                 loi_list_maint(cli, loi);
2916                 osc_check_rpcs(env, cli);
2917                 client_obd_list_unlock(&cli->cl_loi_list_lock);
2918
2919                 CDEBUG(D_CACHE, "sleeping for cache space\n");
2920                 l_wait_event(ocw.ocw_waitq, ocw_granted(cli, &ocw), &lwi);
2921
2922                 client_obd_list_lock(&cli->cl_loi_list_lock);
2923                 if (!cfs_list_empty(&ocw.ocw_entry)) {
2924                         cfs_list_del(&ocw.ocw_entry);
2925                         RETURN(-EINTR);
2926                 }
2927                 RETURN(ocw.ocw_rc);
2928         }
2929
2930         RETURN(-EDQUOT);
2931 }
2932
2933
2934 int osc_prep_async_page(struct obd_export *exp, struct lov_stripe_md *lsm,
2935                         struct lov_oinfo *loi, cfs_page_t *page,
2936                         obd_off offset, const struct obd_async_page_ops *ops,
2937                         void *data, void **res, int nocache,
2938                         struct lustre_handle *lockh)
2939 {
2940         struct osc_async_page *oap;
2941
2942         ENTRY;
2943
2944         if (!page)
2945                 return cfs_size_round(sizeof(*oap));
2946
2947         oap = *res;
2948         oap->oap_magic = OAP_MAGIC;
2949         oap->oap_cli = &exp->exp_obd->u.cli;
2950         oap->oap_loi = loi;
2951
2952         oap->oap_caller_ops = ops;
2953         oap->oap_caller_data = data;
2954
2955         oap->oap_page = page;
2956         oap->oap_obj_off = offset;
2957         if (!client_is_remote(exp) &&
2958             cfs_capable(CFS_CAP_SYS_RESOURCE))
2959                 oap->oap_brw_flags = OBD_BRW_NOQUOTA;
2960
2961         LASSERT(!(offset & ~CFS_PAGE_MASK));
2962
2963         CFS_INIT_LIST_HEAD(&oap->oap_pending_item);
2964         CFS_INIT_LIST_HEAD(&oap->oap_urgent_item);
2965         CFS_INIT_LIST_HEAD(&oap->oap_rpc_item);
2966         CFS_INIT_LIST_HEAD(&oap->oap_page_list);
2967
2968         cfs_spin_lock_init(&oap->oap_lock);
2969         CDEBUG(D_CACHE, "oap %p page %p obj off "LPU64"\n", oap, page, offset);
2970         RETURN(0);
2971 }
2972
2973 int osc_queue_async_io(const struct lu_env *env, struct obd_export *exp,
2974                        struct lov_stripe_md *lsm, struct lov_oinfo *loi,
2975                        struct osc_async_page *oap, int cmd, int off,
2976                        int count, obd_flag brw_flags, enum async_flags async_flags)
2977 {
2978         struct client_obd *cli = &exp->exp_obd->u.cli;
2979         int rc = 0;
2980         ENTRY;
2981
2982         if (oap->oap_magic != OAP_MAGIC)
2983                 RETURN(-EINVAL);
2984
2985         if (cli->cl_import == NULL || cli->cl_import->imp_invalid)
2986                 RETURN(-EIO);
2987
2988         if (!cfs_list_empty(&oap->oap_pending_item) ||
2989             !cfs_list_empty(&oap->oap_urgent_item) ||
2990             !cfs_list_empty(&oap->oap_rpc_item))
2991                 RETURN(-EBUSY);
2992
2993         /* check if the file's owner/group is over quota */
2994         if ((cmd & OBD_BRW_WRITE) && !(cmd & OBD_BRW_NOQUOTA)) {
2995                 struct cl_object *obj;
2996                 struct cl_attr    attr; /* XXX put attr into thread info */
2997                 unsigned int qid[MAXQUOTAS];
2998
2999                 obj = cl_object_top(osc_oap2cl_page(oap)->cp_obj);
3000
3001                 cl_object_attr_lock(obj);
3002                 rc = cl_object_attr_get(env, obj, &attr);
3003                 cl_object_attr_unlock(obj);
3004
3005                 qid[USRQUOTA] = attr.cat_uid;
3006                 qid[GRPQUOTA] = attr.cat_gid;
3007                 if (rc == 0 &&
3008                     lquota_chkdq(quota_interface, cli, qid) == NO_QUOTA)
3009                         rc = -EDQUOT;
3010                 if (rc)
3011                         RETURN(rc);
3012         }
3013
3014         if (loi == NULL)
3015                 loi = lsm->lsm_oinfo[0];
3016
3017         client_obd_list_lock(&cli->cl_loi_list_lock);
3018
3019         LASSERT(off + count <= CFS_PAGE_SIZE);
3020         oap->oap_cmd = cmd;
3021         oap->oap_page_off = off;
3022         oap->oap_count = count;
3023         oap->oap_brw_flags = brw_flags;
3024         /* Give a hint to OST that requests are coming from kswapd - bug19529 */
3025         if (cfs_memory_pressure_get())
3026                 oap->oap_brw_flags |= OBD_BRW_MEMALLOC;
3027         cfs_spin_lock(&oap->oap_lock);
3028         oap->oap_async_flags = async_flags;
3029         cfs_spin_unlock(&oap->oap_lock);
3030
3031         if (cmd & OBD_BRW_WRITE) {
3032                 rc = osc_enter_cache(env, cli, loi, oap);
3033                 if (rc) {
3034                         client_obd_list_unlock(&cli->cl_loi_list_lock);
3035                         RETURN(rc);
3036                 }
3037         }
3038
3039         osc_oap_to_pending(oap);
3040         loi_list_maint(cli, loi);
3041
3042         LOI_DEBUG(loi, "oap %p page %p added for cmd %d\n", oap, oap->oap_page,
3043                   cmd);
3044
3045         osc_check_rpcs(env, cli);
3046         client_obd_list_unlock(&cli->cl_loi_list_lock);
3047
3048         RETURN(0);
3049 }
3050
3051 /* aka (~was & now & flag), but this is more clear :) */
3052 #define SETTING(was, now, flag) (!(was & flag) && (now & flag))
3053
3054 int osc_set_async_flags_base(struct client_obd *cli,
3055                              struct lov_oinfo *loi, struct osc_async_page *oap,
3056                              obd_flag async_flags)
3057 {
3058         struct loi_oap_pages *lop;
3059         int flags = 0;
3060         ENTRY;
3061
3062         LASSERT(!cfs_list_empty(&oap->oap_pending_item));
3063
3064         if (oap->oap_cmd & OBD_BRW_WRITE) {
3065                 lop = &loi->loi_write_lop;
3066         } else {
3067                 lop = &loi->loi_read_lop;
3068         }
3069
3070         if ((oap->oap_async_flags & async_flags) == async_flags)
3071                 RETURN(0);
3072
3073         if (SETTING(oap->oap_async_flags, async_flags, ASYNC_READY))
3074                 flags |= ASYNC_READY;
3075
3076         if (SETTING(oap->oap_async_flags, async_flags, ASYNC_URGENT) &&
3077             cfs_list_empty(&oap->oap_rpc_item)) {
3078                 if (oap->oap_async_flags & ASYNC_HP)
3079                         cfs_list_add(&oap->oap_urgent_item, &lop->lop_urgent);
3080                 else
3081                         cfs_list_add_tail(&oap->oap_urgent_item,
3082                                           &lop->lop_urgent);
3083                 flags |= ASYNC_URGENT;
3084                 loi_list_maint(cli, loi);
3085         }
3086         cfs_spin_lock(&oap->oap_lock);
3087         oap->oap_async_flags |= flags;
3088         cfs_spin_unlock(&oap->oap_lock);
3089
3090         LOI_DEBUG(loi, "oap %p page %p has flags %x\n", oap, oap->oap_page,
3091                         oap->oap_async_flags);
3092         RETURN(0);
3093 }
3094
3095 int osc_teardown_async_page(struct obd_export *exp, struct lov_stripe_md *lsm,
3096                             struct lov_oinfo *loi, struct osc_async_page *oap)
3097 {
3098         struct client_obd *cli = &exp->exp_obd->u.cli;
3099         struct loi_oap_pages *lop;
3100         int rc = 0;
3101         ENTRY;
3102
3103         if (oap->oap_magic != OAP_MAGIC)
3104                 RETURN(-EINVAL);
3105
3106         if (loi == NULL)
3107                 loi = lsm->lsm_oinfo[0];
3108
3109         if (oap->oap_cmd & OBD_BRW_WRITE) {
3110                 lop = &loi->loi_write_lop;
3111         } else {
3112                 lop = &loi->loi_read_lop;
3113         }
3114
3115         client_obd_list_lock(&cli->cl_loi_list_lock);
3116
3117         if (!cfs_list_empty(&oap->oap_rpc_item))
3118                 GOTO(out, rc = -EBUSY);
3119
3120         osc_exit_cache(cli, oap, 0);
3121         osc_wake_cache_waiters(cli);
3122
3123         if (!cfs_list_empty(&oap->oap_urgent_item)) {
3124                 cfs_list_del_init(&oap->oap_urgent_item);
3125                 cfs_spin_lock(&oap->oap_lock);
3126                 oap->oap_async_flags &= ~(ASYNC_URGENT | ASYNC_HP);
3127                 cfs_spin_unlock(&oap->oap_lock);
3128         }
3129         if (!cfs_list_empty(&oap->oap_pending_item)) {
3130                 cfs_list_del_init(&oap->oap_pending_item);
3131                 lop_update_pending(cli, lop, oap->oap_cmd, -1);
3132         }
3133         loi_list_maint(cli, loi);
3134         LOI_DEBUG(loi, "oap %p page %p torn down\n", oap, oap->oap_page);
3135 out:
3136         client_obd_list_unlock(&cli->cl_loi_list_lock);
3137         RETURN(rc);
3138 }
3139
3140 static int osc_set_lock_data_with_check(struct ldlm_lock *lock,
3141                                         struct ldlm_enqueue_info *einfo)
3142 {
3143         void *data = einfo->ei_cbdata;
3144         int set = 0;
3145
3146         LASSERT(lock != NULL);
3147         LASSERT(lock->l_blocking_ast == einfo->ei_cb_bl);
3148         LASSERT(lock->l_resource->lr_type == einfo->ei_type);
3149         LASSERT(lock->l_completion_ast == einfo->ei_cb_cp);
3150         LASSERT(lock->l_glimpse_ast == einfo->ei_cb_gl);
3151
3152         lock_res_and_lock(lock);
3153         cfs_spin_lock(&osc_ast_guard);
3154
3155         if (lock->l_ast_data == NULL)
3156                 lock->l_ast_data = data;
3157         if (lock->l_ast_data == data)
3158                 set = 1;
3159
3160         cfs_spin_unlock(&osc_ast_guard);
3161         unlock_res_and_lock(lock);
3162
3163         return set;
3164 }
3165
3166 static int osc_set_data_with_check(struct lustre_handle *lockh,
3167                                    struct ldlm_enqueue_info *einfo)
3168 {
3169         struct ldlm_lock *lock = ldlm_handle2lock(lockh);
3170         int set = 0;
3171
3172         if (lock != NULL) {
3173                 set = osc_set_lock_data_with_check(lock, einfo);
3174                 LDLM_LOCK_PUT(lock);
3175         } else
3176                 CERROR("lockh %p, data %p - client evicted?\n",
3177                        lockh, einfo->ei_cbdata);
3178         return set;
3179 }
3180
3181 static int osc_change_cbdata(struct obd_export *exp, struct lov_stripe_md *lsm,
3182                              ldlm_iterator_t replace, void *data)
3183 {
3184         struct ldlm_res_id res_id;
3185         struct obd_device *obd = class_exp2obd(exp);
3186
3187         osc_build_res_name(lsm->lsm_object_id, lsm->lsm_object_seq, &res_id);
3188         ldlm_resource_iterate(obd->obd_namespace, &res_id, replace, data);
3189         return 0;
3190 }
3191
3192 /* find any ldlm lock of the inode in osc
3193  * return 0    not find
3194  *        1    find one
3195  *      < 0    error */
3196 static int osc_find_cbdata(struct obd_export *exp, struct lov_stripe_md *lsm,
3197                            ldlm_iterator_t replace, void *data)
3198 {
3199         struct ldlm_res_id res_id;
3200         struct obd_device *obd = class_exp2obd(exp);
3201         int rc = 0;
3202
3203         osc_build_res_name(lsm->lsm_object_id, lsm->lsm_object_seq, &res_id);
3204         rc = ldlm_resource_iterate(obd->obd_namespace, &res_id, replace, data);
3205         if (rc == LDLM_ITER_STOP)
3206                 return(1);
3207         if (rc == LDLM_ITER_CONTINUE)
3208                 return(0);
3209         return(rc);
3210 }
3211
3212 static int osc_enqueue_fini(struct ptlrpc_request *req, struct ost_lvb *lvb,
3213                             obd_enqueue_update_f upcall, void *cookie,
3214                             int *flags, int rc)
3215 {
3216         int intent = *flags & LDLM_FL_HAS_INTENT;
3217         ENTRY;
3218
3219         if (intent) {
3220                 /* The request was created before ldlm_cli_enqueue call. */
3221                 if (rc == ELDLM_LOCK_ABORTED) {
3222                         struct ldlm_reply *rep;
3223                         rep = req_capsule_server_get(&req->rq_pill,
3224                                                      &RMF_DLM_REP);
3225
3226                         LASSERT(rep != NULL);
3227                         if (rep->lock_policy_res1)
3228                                 rc = rep->lock_policy_res1;
3229                 }
3230         }
3231
3232         if ((intent && rc == ELDLM_LOCK_ABORTED) || !rc) {
3233                 *flags |= LDLM_FL_LVB_READY;
3234                 CDEBUG(D_INODE,"got kms "LPU64" blocks "LPU64" mtime "LPU64"\n",
3235                        lvb->lvb_size, lvb->lvb_blocks, lvb->lvb_mtime);
3236         }
3237
3238         /* Call the update callback. */
3239         rc = (*upcall)(cookie, rc);
3240         RETURN(rc);
3241 }
3242
3243 static int osc_enqueue_interpret(const struct lu_env *env,
3244                                  struct ptlrpc_request *req,
3245                                  struct osc_enqueue_args *aa, int rc)
3246 {
3247         struct ldlm_lock *lock;
3248         struct lustre_handle handle;
3249         __u32 mode;
3250
3251         /* Make a local copy of a lock handle and a mode, because aa->oa_*
3252          * might be freed anytime after lock upcall has been called. */
3253         lustre_handle_copy(&handle, aa->oa_lockh);
3254         mode = aa->oa_ei->ei_mode;
3255
3256         /* ldlm_cli_enqueue is holding a reference on the lock, so it must
3257          * be valid. */
3258         lock = ldlm_handle2lock(&handle);
3259
3260         /* Take an additional reference so that a blocking AST that
3261          * ldlm_cli_enqueue_fini() might post for a failed lock, is guaranteed
3262          * to arrive after an upcall has been executed by
3263          * osc_enqueue_fini(). */
3264         ldlm_lock_addref(&handle, mode);
3265
3266         /* Let CP AST to grant the lock first. */
3267         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_ENQ_RACE, 1);
3268
3269         /* Complete obtaining the lock procedure. */
3270         rc = ldlm_cli_enqueue_fini(aa->oa_exp, req, aa->oa_ei->ei_type, 1,
3271                                    mode, aa->oa_flags, aa->oa_lvb,
3272                                    sizeof(*aa->oa_lvb), &handle, rc);
3273         /* Complete osc stuff. */
3274         rc = osc_enqueue_fini(req, aa->oa_lvb,
3275                               aa->oa_upcall, aa->oa_cookie, aa->oa_flags, rc);
3276
3277         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_CANCEL_RACE, 10);
3278
3279         /* Release the lock for async request. */
3280         if (lustre_handle_is_used(&handle) && rc == ELDLM_OK)
3281                 /*
3282                  * Releases a reference taken by ldlm_cli_enqueue(), if it is
3283                  * not already released by
3284                  * ldlm_cli_enqueue_fini()->failed_lock_cleanup()
3285                  */
3286                 ldlm_lock_decref(&handle, mode);
3287
3288         LASSERTF(lock != NULL, "lockh %p, req %p, aa %p - client evicted?\n",
3289                  aa->oa_lockh, req, aa);
3290         ldlm_lock_decref(&handle, mode);
3291         LDLM_LOCK_PUT(lock);
3292         return rc;
3293 }
3294
3295 void osc_update_enqueue(struct lustre_handle *lov_lockhp,
3296                         struct lov_oinfo *loi, int flags,
3297                         struct ost_lvb *lvb, __u32 mode, int rc)
3298 {
3299         if (rc == ELDLM_OK) {
3300                 struct ldlm_lock *lock = ldlm_handle2lock(lov_lockhp);
3301                 __u64 tmp;
3302
3303                 LASSERT(lock != NULL);
3304                 loi->loi_lvb = *lvb;
3305                 tmp = loi->loi_lvb.lvb_size;
3306                 /* Extend KMS up to the end of this lock and no further
3307                  * A lock on [x,y] means a KMS of up to y + 1 bytes! */
3308                 if (tmp > lock->l_policy_data.l_extent.end)
3309                         tmp = lock->l_policy_data.l_extent.end + 1;
3310                 if (tmp >= loi->loi_kms) {
3311                         LDLM_DEBUG(lock, "lock acquired, setting rss="LPU64
3312                                    ", kms="LPU64, loi->loi_lvb.lvb_size, tmp);
3313                         loi_kms_set(loi, tmp);
3314                 } else {
3315                         LDLM_DEBUG(lock, "lock acquired, setting rss="
3316                                    LPU64"; leaving kms="LPU64", end="LPU64,
3317                                    loi->loi_lvb.lvb_size, loi->loi_kms,
3318                                    lock->l_policy_data.l_extent.end);
3319                 }
3320                 ldlm_lock_allow_match(lock);
3321                 LDLM_LOCK_PUT(lock);
3322         } else if (rc == ELDLM_LOCK_ABORTED && (flags & LDLM_FL_HAS_INTENT)) {
3323                 loi->loi_lvb = *lvb;
3324                 CDEBUG(D_INODE, "glimpsed, setting rss="LPU64"; leaving"
3325                        " kms="LPU64"\n", loi->loi_lvb.lvb_size, loi->loi_kms);
3326                 rc = ELDLM_OK;
3327         }
3328 }
3329 EXPORT_SYMBOL(osc_update_enqueue);
3330
3331 struct ptlrpc_request_set *PTLRPCD_SET = (void *)1;
3332
3333 /* When enqueuing asynchronously, locks are not ordered, we can obtain a lock
3334  * from the 2nd OSC before a lock from the 1st one. This does not deadlock with
3335  * other synchronous requests, however keeping some locks and trying to obtain
3336  * others may take a considerable amount of time in a case of ost failure; and
3337  * when other sync requests do not get released lock from a client, the client
3338  * is excluded from the cluster -- such scenarious make the life difficult, so
3339  * release locks just after they are obtained. */
3340 int osc_enqueue_base(struct obd_export *exp, struct ldlm_res_id *res_id,
3341                      int *flags, ldlm_policy_data_t *policy,
3342                      struct ost_lvb *lvb, int kms_valid,
3343                      obd_enqueue_update_f upcall, void *cookie,
3344                      struct ldlm_enqueue_info *einfo,
3345                      struct lustre_handle *lockh,
3346                      struct ptlrpc_request_set *rqset, int async)
3347 {
3348         struct obd_device *obd = exp->exp_obd;
3349         struct ptlrpc_request *req = NULL;
3350         int intent = *flags & LDLM_FL_HAS_INTENT;
3351         ldlm_mode_t mode;
3352         int rc;
3353         ENTRY;
3354
3355         /* Filesystem lock extents are extended to page boundaries so that
3356          * dealing with the page cache is a little smoother.  */
3357         policy->l_extent.start -= policy->l_extent.start & ~CFS_PAGE_MASK;
3358         policy->l_extent.end |= ~CFS_PAGE_MASK;
3359
3360         /*
3361          * kms is not valid when either object is completely fresh (so that no
3362          * locks are cached), or object was evicted. In the latter case cached
3363          * lock cannot be used, because it would prime inode state with
3364          * potentially stale LVB.
3365          */
3366         if (!kms_valid)
3367                 goto no_match;
3368
3369         /* Next, search for already existing extent locks that will cover us */
3370         /* If we're trying to read, we also search for an existing PW lock.  The
3371          * VFS and page cache already protect us locally, so lots of readers/
3372          * writers can share a single PW lock.
3373          *
3374          * There are problems with conversion deadlocks, so instead of
3375          * converting a read lock to a write lock, we'll just enqueue a new
3376          * one.
3377          *
3378          * At some point we should cancel the read lock instead of making them
3379          * send us a blocking callback, but there are problems with canceling
3380          * locks out from other users right now, too. */
3381         mode = einfo->ei_mode;
3382         if (einfo->ei_mode == LCK_PR)
3383                 mode |= LCK_PW;
3384         mode = ldlm_lock_match(obd->obd_namespace,
3385                                *flags | LDLM_FL_LVB_READY, res_id,
3386                                einfo->ei_type, policy, mode, lockh, 0);
3387         if (mode) {
3388                 struct ldlm_lock *matched = ldlm_handle2lock(lockh);
3389
3390                 if (osc_set_lock_data_with_check(matched, einfo)) {
3391                         /* addref the lock only if not async requests and PW
3392                          * lock is matched whereas we asked for PR. */
3393                         if (!rqset && einfo->ei_mode != mode)
3394                                 ldlm_lock_addref(lockh, LCK_PR);
3395                         if (intent) {
3396                                 /* I would like to be able to ASSERT here that
3397                                  * rss <= kms, but I can't, for reasons which
3398                                  * are explained in lov_enqueue() */
3399                         }
3400
3401                         /* We already have a lock, and it's referenced */
3402                         (*upcall)(cookie, ELDLM_OK);
3403
3404                         /* For async requests, decref the lock. */
3405                         if (einfo->ei_mode != mode)
3406                                 ldlm_lock_decref(lockh, LCK_PW);
3407                         else if (rqset)
3408                                 ldlm_lock_decref(lockh, einfo->ei_mode);
3409                         LDLM_LOCK_PUT(matched);
3410                         RETURN(ELDLM_OK);
3411                 } else
3412                         ldlm_lock_decref(lockh, mode);
3413                 LDLM_LOCK_PUT(matched);
3414         }
3415
3416  no_match:
3417         if (intent) {
3418                 CFS_LIST_HEAD(cancels);
3419                 req = ptlrpc_request_alloc(class_exp2cliimp(exp),
3420                                            &RQF_LDLM_ENQUEUE_LVB);
3421                 if (req == NULL)
3422                         RETURN(-ENOMEM);
3423
3424                 rc = ldlm_prep_enqueue_req(exp, req, &cancels, 0);
3425                 if (rc) {
3426                         ptlrpc_request_free(req);
3427                         RETURN(rc);
3428                 }
3429
3430                 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
3431                                      sizeof *lvb);
3432                 ptlrpc_request_set_replen(req);
3433         }
3434
3435         /* users of osc_enqueue() can pass this flag for ldlm_lock_match() */
3436         *flags &= ~LDLM_FL_BLOCK_GRANTED;
3437
3438         rc = ldlm_cli_enqueue(exp, &req, einfo, res_id, policy, flags, lvb,
3439                               sizeof(*lvb), lockh, async);
3440         if (rqset) {
3441                 if (!rc) {
3442                         struct osc_enqueue_args *aa;
3443                         CLASSERT (sizeof(*aa) <= sizeof(req->rq_async_args));
3444                         aa = ptlrpc_req_async_args(req);
3445                         aa->oa_ei = einfo;
3446                         aa->oa_exp = exp;
3447                         aa->oa_flags  = flags;
3448                         aa->oa_upcall = upcall;
3449                         aa->oa_cookie = cookie;
3450                         aa->oa_lvb    = lvb;
3451                         aa->oa_lockh  = lockh;
3452
3453                         req->rq_interpret_reply =
3454                                 (ptlrpc_interpterer_t)osc_enqueue_interpret;
3455                         if (rqset == PTLRPCD_SET)
3456                                 ptlrpcd_add_req(req, PSCOPE_OTHER);
3457                         else
3458                                 ptlrpc_set_add_req(rqset, req);
3459                 } else if (intent) {
3460                         ptlrpc_req_finished(req);
3461                 }
3462                 RETURN(rc);
3463         }
3464
3465         rc = osc_enqueue_fini(req, lvb, upcall, cookie, flags, rc);
3466         if (intent)
3467                 ptlrpc_req_finished(req);
3468
3469         RETURN(rc);
3470 }
3471
3472 static int osc_enqueue(struct obd_export *exp, struct obd_info *oinfo,
3473                        struct ldlm_enqueue_info *einfo,
3474                        struct ptlrpc_request_set *rqset)
3475 {
3476         struct ldlm_res_id res_id;
3477         int rc;
3478         ENTRY;
3479
3480         osc_build_res_name(oinfo->oi_md->lsm_object_id,
3481                            oinfo->oi_md->lsm_object_seq, &res_id);
3482
3483         rc = osc_enqueue_base(exp, &res_id, &oinfo->oi_flags, &oinfo->oi_policy,
3484                               &oinfo->oi_md->lsm_oinfo[0]->loi_lvb,
3485                               oinfo->oi_md->lsm_oinfo[0]->loi_kms_valid,
3486                               oinfo->oi_cb_up, oinfo, einfo, oinfo->oi_lockh,
3487                               rqset, rqset != NULL);
3488         RETURN(rc);
3489 }
3490
3491 int osc_match_base(struct obd_export *exp, struct ldlm_res_id *res_id,
3492                    __u32 type, ldlm_policy_data_t *policy, __u32 mode,
3493                    int *flags, void *data, struct lustre_handle *lockh,
3494                    int unref)
3495 {
3496         struct obd_device *obd = exp->exp_obd;
3497         int lflags = *flags;
3498         ldlm_mode_t rc;
3499         ENTRY;
3500
3501         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_MATCH))
3502                 RETURN(-EIO);
3503
3504         /* Filesystem lock extents are extended to page boundaries so that
3505          * dealing with the page cache is a little smoother */
3506         policy->l_extent.start -= policy->l_extent.start & ~CFS_PAGE_MASK;
3507         policy->l_extent.end |= ~CFS_PAGE_MASK;
3508
3509         /* Next, search for already existing extent locks that will cover us */
3510         /* If we're trying to read, we also search for an existing PW lock.  The
3511          * VFS and page cache already protect us locally, so lots of readers/
3512          * writers can share a single PW lock. */
3513         rc = mode;
3514         if (mode == LCK_PR)
3515                 rc |= LCK_PW;
3516         rc = ldlm_lock_match(obd->obd_namespace, lflags,
3517                              res_id, type, policy, rc, lockh, unref);
3518         if (rc) {
3519                 if (data != NULL) {
3520                         if (!osc_set_data_with_check(lockh, data)) {
3521                                 if (!(lflags & LDLM_FL_TEST_LOCK))
3522                                         ldlm_lock_decref(lockh, rc);
3523                                 RETURN(0);
3524                         }
3525                 }
3526                 if (!(lflags & LDLM_FL_TEST_LOCK) && mode != rc) {
3527                         ldlm_lock_addref(lockh, LCK_PR);
3528                         ldlm_lock_decref(lockh, LCK_PW);
3529                 }
3530                 RETURN(rc);
3531         }
3532         RETURN(rc);
3533 }
3534
3535 int osc_cancel_base(struct lustre_handle *lockh, __u32 mode)
3536 {
3537         ENTRY;
3538
3539         if (unlikely(mode == LCK_GROUP))
3540                 ldlm_lock_decref_and_cancel(lockh, mode);
3541         else
3542                 ldlm_lock_decref(lockh, mode);
3543
3544         RETURN(0);
3545 }
3546
3547 static int osc_cancel(struct obd_export *exp, struct lov_stripe_md *md,
3548                       __u32 mode, struct lustre_handle *lockh)
3549 {
3550         ENTRY;
3551         RETURN(osc_cancel_base(lockh, mode));
3552 }
3553
3554 static int osc_cancel_unused(struct obd_export *exp,
3555                              struct lov_stripe_md *lsm,
3556                              ldlm_cancel_flags_t flags,
3557                              void *opaque)
3558 {
3559         struct obd_device *obd = class_exp2obd(exp);
3560         struct ldlm_res_id res_id, *resp = NULL;
3561
3562         if (lsm != NULL) {
3563                 resp = osc_build_res_name(lsm->lsm_object_id,
3564                                           lsm->lsm_object_seq, &res_id);
3565         }
3566
3567         return ldlm_cli_cancel_unused(obd->obd_namespace, resp, flags, opaque);
3568 }
3569
3570 static int osc_statfs_interpret(const struct lu_env *env,
3571                                 struct ptlrpc_request *req,
3572                                 struct osc_async_args *aa, int rc)
3573 {
3574         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
3575         struct obd_statfs *msfs;
3576         __u64 used;
3577         ENTRY;
3578
3579         if (rc == -EBADR)
3580                 /* The request has in fact never been sent
3581                  * due to issues at a higher level (LOV).
3582                  * Exit immediately since the caller is
3583                  * aware of the problem and takes care
3584                  * of the clean up */
3585                  RETURN(rc);
3586
3587         if ((rc == -ENOTCONN || rc == -EAGAIN) &&
3588             (aa->aa_oi->oi_flags & OBD_STATFS_NODELAY))
3589                 GOTO(out, rc = 0);
3590
3591         if (rc != 0)
3592                 GOTO(out, rc);
3593
3594         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
3595         if (msfs == NULL) {
3596                 GOTO(out, rc = -EPROTO);
3597         }
3598
3599         /* Reinitialize the RDONLY and DEGRADED flags at the client
3600          * on each statfs, so they don't stay set permanently. */
3601         cfs_spin_lock(&cli->cl_oscc.oscc_lock);
3602
3603         if (unlikely(msfs->os_state & OS_STATE_DEGRADED))
3604                 cli->cl_oscc.oscc_flags |= OSCC_FLAG_DEGRADED;
3605         else if (unlikely(cli->cl_oscc.oscc_flags & OSCC_FLAG_DEGRADED))
3606                 cli->cl_oscc.oscc_flags &= ~OSCC_FLAG_DEGRADED;
3607
3608         if (unlikely(msfs->os_state & OS_STATE_READONLY))
3609                 cli->cl_oscc.oscc_flags |= OSCC_FLAG_RDONLY;
3610         else if (unlikely(cli->cl_oscc.oscc_flags & OSCC_FLAG_RDONLY))
3611                 cli->cl_oscc.oscc_flags &= ~OSCC_FLAG_RDONLY;
3612
3613         /* Add a bit of hysteresis so this flag isn't continually flapping,
3614          * and ensure that new files don't get extremely fragmented due to
3615          * only a small amount of available space in the filesystem.
3616          * We want to set the NOSPC flag when there is less than ~0.1% free
3617          * and clear it when there is at least ~0.2% free space, so:
3618          *                   avail < ~0.1% max          max = avail + used
3619          *            1025 * avail < avail + used       used = blocks - free
3620          *            1024 * avail < used
3621          *            1024 * avail < blocks - free
3622          *                   avail < ((blocks - free) >> 10)
3623          *
3624          * On very large disk, say 16TB 0.1% will be 16 GB. We don't want to
3625          * lose that amount of space so in those cases we report no space left
3626          * if their is less than 1 GB left.                             */
3627         used = min_t(__u64,(msfs->os_blocks - msfs->os_bfree) >> 10, 1 << 30);
3628         if (unlikely(((cli->cl_oscc.oscc_flags & OSCC_FLAG_NOSPC) == 0) &&
3629                      ((msfs->os_ffree < 32) || (msfs->os_bavail < used))))
3630                 cli->cl_oscc.oscc_flags |= OSCC_FLAG_NOSPC;
3631         else if (unlikely(((cli->cl_oscc.oscc_flags & OSCC_FLAG_NOSPC) != 0) &&
3632                 (msfs->os_ffree > 64) && (msfs->os_bavail > (used << 1))))
3633                         cli->cl_oscc.oscc_flags &= ~OSCC_FLAG_NOSPC;
3634
3635         cfs_spin_unlock(&cli->cl_oscc.oscc_lock);
3636
3637         *aa->aa_oi->oi_osfs = *msfs;
3638 out:
3639         rc = aa->aa_oi->oi_cb_up(aa->aa_oi, rc);
3640         RETURN(rc);
3641 }
3642
3643 static int osc_statfs_async(struct obd_device *obd, struct obd_info *oinfo,
3644                             __u64 max_age, struct ptlrpc_request_set *rqset)
3645 {
3646         struct ptlrpc_request *req;
3647         struct osc_async_args *aa;
3648         int                    rc;
3649         ENTRY;
3650
3651         /* We could possibly pass max_age in the request (as an absolute
3652          * timestamp or a "seconds.usec ago") so the target can avoid doing
3653          * extra calls into the filesystem if that isn't necessary (e.g.
3654          * during mount that would help a bit).  Having relative timestamps
3655          * is not so great if request processing is slow, while absolute
3656          * timestamps are not ideal because they need time synchronization. */
3657         req = ptlrpc_request_alloc(obd->u.cli.cl_import, &RQF_OST_STATFS);
3658         if (req == NULL)
3659                 RETURN(-ENOMEM);
3660
3661         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_STATFS);
3662         if (rc) {
3663                 ptlrpc_request_free(req);
3664                 RETURN(rc);
3665         }
3666         ptlrpc_request_set_replen(req);
3667         req->rq_request_portal = OST_CREATE_PORTAL;
3668         ptlrpc_at_set_req_timeout(req);
3669
3670         if (oinfo->oi_flags & OBD_STATFS_NODELAY) {
3671                 /* procfs requests not want stat in wait for avoid deadlock */
3672                 req->rq_no_resend = 1;
3673                 req->rq_no_delay = 1;
3674         }
3675
3676         req->rq_interpret_reply = (ptlrpc_interpterer_t)osc_statfs_interpret;
3677         CLASSERT (sizeof(*aa) <= sizeof(req->rq_async_args));
3678         aa = ptlrpc_req_async_args(req);
3679         aa->aa_oi = oinfo;
3680
3681         ptlrpc_set_add_req(rqset, req);
3682         RETURN(0);
3683 }
3684
3685 static int osc_statfs(struct obd_device *obd, struct obd_statfs *osfs,
3686                       __u64 max_age, __u32 flags)
3687 {
3688         struct obd_statfs     *msfs;
3689         struct ptlrpc_request *req;
3690         struct obd_import     *imp = NULL;
3691         int rc;
3692         ENTRY;
3693
3694         /*Since the request might also come from lprocfs, so we need
3695          *sync this with client_disconnect_export Bug15684*/
3696         cfs_down_read(&obd->u.cli.cl_sem);
3697         if (obd->u.cli.cl_import)
3698                 imp = class_import_get(obd->u.cli.cl_import);
3699         cfs_up_read(&obd->u.cli.cl_sem);
3700         if (!imp)
3701                 RETURN(-ENODEV);
3702
3703         /* We could possibly pass max_age in the request (as an absolute
3704          * timestamp or a "seconds.usec ago") so the target can avoid doing
3705          * extra calls into the filesystem if that isn't necessary (e.g.
3706          * during mount that would help a bit).  Having relative timestamps
3707          * is not so great if request processing is slow, while absolute
3708          * timestamps are not ideal because they need time synchronization. */
3709         req = ptlrpc_request_alloc(imp, &RQF_OST_STATFS);
3710
3711         class_import_put(imp);
3712
3713         if (req == NULL)
3714                 RETURN(-ENOMEM);
3715
3716         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_STATFS);
3717         if (rc) {
3718                 ptlrpc_request_free(req);
3719                 RETURN(rc);
3720         }
3721         ptlrpc_request_set_replen(req);
3722         req->rq_request_portal = OST_CREATE_PORTAL;
3723         ptlrpc_at_set_req_timeout(req);
3724
3725         if (flags & OBD_STATFS_NODELAY) {
3726                 /* procfs requests not want stat in wait for avoid deadlock */
3727                 req->rq_no_resend = 1;
3728                 req->rq_no_delay = 1;
3729         }
3730
3731         rc = ptlrpc_queue_wait(req);
3732         if (rc)
3733                 GOTO(out, rc);
3734
3735         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
3736         if (msfs == NULL) {
3737                 GOTO(out, rc = -EPROTO);
3738         }
3739
3740         *osfs = *msfs;
3741
3742         EXIT;
3743  out:
3744         ptlrpc_req_finished(req);
3745         return rc;
3746 }
3747
3748 /* Retrieve object striping information.
3749  *
3750  * @lmmu is a pointer to an in-core struct with lmm_ost_count indicating
3751  * the maximum number of OST indices which will fit in the user buffer.
3752  * lmm_magic must be LOV_MAGIC (we only use 1 slot here).
3753  */
3754 static int osc_getstripe(struct lov_stripe_md *lsm, struct lov_user_md *lump)
3755 {
3756         /* we use lov_user_md_v3 because it is larger than lov_user_md_v1 */
3757         struct lov_user_md_v3 lum, *lumk;
3758         struct lov_user_ost_data_v1 *lmm_objects;
3759         int rc = 0, lum_size;
3760         ENTRY;
3761
3762         if (!lsm)
3763                 RETURN(-ENODATA);
3764
3765         /* we only need the header part from user space to get lmm_magic and
3766          * lmm_stripe_count, (the header part is common to v1 and v3) */
3767         lum_size = sizeof(struct lov_user_md_v1);
3768         if (cfs_copy_from_user(&lum, lump, lum_size))
3769                 RETURN(-EFAULT);
3770
3771         if ((lum.lmm_magic != LOV_USER_MAGIC_V1) &&
3772             (lum.lmm_magic != LOV_USER_MAGIC_V3))
3773                 RETURN(-EINVAL);
3774
3775         /* lov_user_md_vX and lov_mds_md_vX must have the same size */
3776         LASSERT(sizeof(struct lov_user_md_v1) == sizeof(struct lov_mds_md_v1));
3777         LASSERT(sizeof(struct lov_user_md_v3) == sizeof(struct lov_mds_md_v3));
3778         LASSERT(sizeof(lum.lmm_objects[0]) == sizeof(lumk->lmm_objects[0]));
3779
3780         /* we can use lov_mds_md_size() to compute lum_size
3781          * because lov_user_md_vX and lov_mds_md_vX have the same size */
3782         if (lum.lmm_stripe_count > 0) {
3783                 lum_size = lov_mds_md_size(lum.lmm_stripe_count, lum.lmm_magic);
3784                 OBD_ALLOC(lumk, lum_size);
3785                 if (!lumk)
3786                         RETURN(-ENOMEM);
3787
3788                 if (lum.lmm_magic == LOV_USER_MAGIC_V1)
3789                         lmm_objects = &(((struct lov_user_md_v1 *)lumk)->lmm_objects[0]);
3790                 else
3791                         lmm_objects = &(lumk->lmm_objects[0]);
3792                 lmm_objects->l_object_id = lsm->lsm_object_id;
3793         } else {
3794                 lum_size = lov_mds_md_size(0, lum.lmm_magic);
3795                 lumk = &lum;
3796         }
3797
3798         lumk->lmm_object_id = lsm->lsm_object_id;
3799         lumk->lmm_object_seq = lsm->lsm_object_seq;
3800         lumk->lmm_stripe_count = 1;
3801
3802         if (cfs_copy_to_user(lump, lumk, lum_size))
3803                 rc = -EFAULT;
3804
3805         if (lumk != &lum)
3806                 OBD_FREE(lumk, lum_size);
3807
3808         RETURN(rc);
3809 }
3810
3811
3812 static int osc_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
3813                          void *karg, void *uarg)
3814 {
3815         struct obd_device *obd = exp->exp_obd;
3816         struct obd_ioctl_data *data = karg;
3817         int err = 0;
3818         ENTRY;
3819
3820         if (!cfs_try_module_get(THIS_MODULE)) {
3821                 CERROR("Can't get module. Is it alive?");
3822                 return -EINVAL;
3823         }
3824         switch (cmd) {
3825         case OBD_IOC_LOV_GET_CONFIG: {
3826                 char *buf;
3827                 struct lov_desc *desc;
3828                 struct obd_uuid uuid;
3829
3830                 buf = NULL;
3831                 len = 0;
3832                 if (obd_ioctl_getdata(&buf, &len, (void *)uarg))
3833                         GOTO(out, err = -EINVAL);
3834
3835                 data = (struct obd_ioctl_data *)buf;
3836
3837                 if (sizeof(*desc) > data->ioc_inllen1) {
3838                         obd_ioctl_freedata(buf, len);
3839                         GOTO(out, err = -EINVAL);
3840                 }
3841
3842                 if (data->ioc_inllen2 < sizeof(uuid)) {
3843                         obd_ioctl_freedata(buf, len);
3844                         GOTO(out, err = -EINVAL);
3845                 }
3846
3847                 desc = (struct lov_desc *)data->ioc_inlbuf1;
3848                 desc->ld_tgt_count = 1;
3849                 desc->ld_active_tgt_count = 1;
3850                 desc->ld_default_stripe_count = 1;
3851                 desc->ld_default_stripe_size = 0;
3852                 desc->ld_default_stripe_offset = 0;
3853                 desc->ld_pattern = 0;
3854                 memcpy(&desc->ld_uuid, &obd->obd_uuid, sizeof(uuid));
3855
3856                 memcpy(data->ioc_inlbuf2, &obd->obd_uuid, sizeof(uuid));
3857
3858                 err = cfs_copy_to_user((void *)uarg, buf, len);
3859                 if (err)
3860                         err = -EFAULT;
3861                 obd_ioctl_freedata(buf, len);
3862                 GOTO(out, err);
3863         }
3864         case LL_IOC_LOV_SETSTRIPE:
3865                 err = obd_alloc_memmd(exp, karg);
3866                 if (err > 0)
3867                         err = 0;
3868                 GOTO(out, err);
3869         case LL_IOC_LOV_GETSTRIPE:
3870                 err = osc_getstripe(karg, uarg);
3871                 GOTO(out, err);
3872         case OBD_IOC_CLIENT_RECOVER:
3873                 err = ptlrpc_recover_import(obd->u.cli.cl_import,
3874                                             data->ioc_inlbuf1);
3875                 if (err > 0)
3876                         err = 0;
3877                 GOTO(out, err);
3878         case IOC_OSC_SET_ACTIVE:
3879                 err = ptlrpc_set_import_active(obd->u.cli.cl_import,
3880                                                data->ioc_offset);
3881                 GOTO(out, err);
3882         case OBD_IOC_POLL_QUOTACHECK:
3883                 err = lquota_poll_check(quota_interface, exp,
3884                                         (struct if_quotacheck *)karg);
3885                 GOTO(out, err);
3886         case OBD_IOC_PING_TARGET:
3887                 err = ptlrpc_obd_ping(obd);
3888                 GOTO(out, err);
3889         default:
3890                 CDEBUG(D_INODE, "unrecognised ioctl %#x by %s\n",
3891                        cmd, cfs_curproc_comm());
3892                 GOTO(out, err = -ENOTTY);
3893         }
3894 out:
3895         cfs_module_put(THIS_MODULE);
3896         return err;
3897 }
3898
3899 static int osc_get_info(struct obd_export *exp, obd_count keylen,
3900                         void *key, __u32 *vallen, void *val,
3901                         struct lov_stripe_md *lsm)
3902 {
3903         ENTRY;
3904         if (!vallen || !val)
3905                 RETURN(-EFAULT);
3906
3907         if (KEY_IS(KEY_LOCK_TO_STRIPE)) {
3908                 __u32 *stripe = val;
3909                 *vallen = sizeof(*stripe);
3910                 *stripe = 0;
3911                 RETURN(0);
3912         } else if (KEY_IS(KEY_LAST_ID)) {
3913                 struct ptlrpc_request *req;
3914                 obd_id                *reply;
3915                 char                  *tmp;
3916                 int                    rc;
3917
3918                 req = ptlrpc_request_alloc(class_exp2cliimp(exp),
3919                                            &RQF_OST_GET_INFO_LAST_ID);
3920                 if (req == NULL)
3921                         RETURN(-ENOMEM);
3922
3923                 req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_KEY,
3924                                      RCL_CLIENT, keylen);
3925                 rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GET_INFO);
3926                 if (rc) {
3927                         ptlrpc_request_free(req);
3928                         RETURN(rc);
3929                 }
3930
3931                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
3932                 memcpy(tmp, key, keylen);
3933
3934                 req->rq_no_delay = req->rq_no_resend = 1;
3935                 ptlrpc_request_set_replen(req);
3936                 rc = ptlrpc_queue_wait(req);
3937                 if (rc)
3938                         GOTO(out, rc);
3939
3940                 reply = req_capsule_server_get(&req->rq_pill, &RMF_OBD_ID);
3941                 if (reply == NULL)
3942                         GOTO(out, rc = -EPROTO);
3943
3944                 *((obd_id *)val) = *reply;
3945         out:
3946                 ptlrpc_req_finished(req);
3947                 RETURN(rc);
3948         } else if (KEY_IS(KEY_FIEMAP)) {
3949                 struct ptlrpc_request *req;
3950                 struct ll_user_fiemap *reply;
3951                 char *tmp;
3952                 int rc;
3953
3954                 req = ptlrpc_request_alloc(class_exp2cliimp(exp),
3955                                            &RQF_OST_GET_INFO_FIEMAP);
3956                 if (req == NULL)
3957                         RETURN(-ENOMEM);
3958
3959                 req_capsule_set_size(&req->rq_pill, &RMF_FIEMAP_KEY,
3960                                      RCL_CLIENT, keylen);
3961                 req_capsule_set_size(&req->rq_pill, &RMF_FIEMAP_VAL,
3962                                      RCL_CLIENT, *vallen);
3963                 req_capsule_set_size(&req->rq_pill, &RMF_FIEMAP_VAL,
3964                                      RCL_SERVER, *vallen);
3965
3966                 rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GET_INFO);
3967                 if (rc) {
3968                         ptlrpc_request_free(req);
3969                         RETURN(rc);
3970                 }
3971
3972                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_FIEMAP_KEY);
3973                 memcpy(tmp, key, keylen);
3974                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_FIEMAP_VAL);
3975                 memcpy(tmp, val, *vallen);
3976
3977                 ptlrpc_request_set_replen(req);
3978                 rc = ptlrpc_queue_wait(req);
3979                 if (rc)
3980                         GOTO(out1, rc);
3981
3982                 reply = req_capsule_server_get(&req->rq_pill, &RMF_FIEMAP_VAL);
3983                 if (reply == NULL)
3984                         GOTO(out1, rc = -EPROTO);
3985
3986                 memcpy(val, reply, *vallen);
3987         out1:
3988                 ptlrpc_req_finished(req);
3989
3990                 RETURN(rc);
3991         }
3992
3993         RETURN(-EINVAL);
3994 }
3995
3996 static int osc_setinfo_mds_connect_import(struct obd_import *imp)
3997 {
3998         struct llog_ctxt *ctxt;
3999         int rc = 0;
4000         ENTRY;
4001
4002         ctxt = llog_get_context(imp->imp_obd, LLOG_MDS_OST_ORIG_CTXT);
4003         if (ctxt) {
4004                 rc = llog_initiator_connect(ctxt);
4005                 llog_ctxt_put(ctxt);
4006         } else {
4007                 /* XXX return an error? skip setting below flags? */
4008         }
4009
4010         cfs_spin_lock(&imp->imp_lock);
4011         imp->imp_server_timeout = 1;
4012         imp->imp_pingable = 1;
4013         cfs_spin_unlock(&imp->imp_lock);
4014         CDEBUG(D_RPCTRACE, "pinging OST %s\n", obd2cli_tgt(imp->imp_obd));
4015
4016         RETURN(rc);
4017 }
4018
4019 static int osc_setinfo_mds_conn_interpret(const struct lu_env *env,
4020                                           struct ptlrpc_request *req,
4021                                           void *aa, int rc)
4022 {
4023         ENTRY;
4024         if (rc != 0)
4025                 RETURN(rc);
4026
4027         RETURN(osc_setinfo_mds_connect_import(req->rq_import));
4028 }
4029
4030 static int osc_set_info_async(struct obd_export *exp, obd_count keylen,
4031                               void *key, obd_count vallen, void *val,
4032                               struct ptlrpc_request_set *set)
4033 {
4034         struct ptlrpc_request *req;
4035         struct obd_device     *obd = exp->exp_obd;
4036         struct obd_import     *imp = class_exp2cliimp(exp);
4037         char                  *tmp;
4038         int                    rc;
4039         ENTRY;
4040
4041         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_SHUTDOWN, 10);
4042
4043         if (KEY_IS(KEY_NEXT_ID)) {
4044                 obd_id new_val;
4045                 struct osc_creator *oscc = &obd->u.cli.cl_oscc;
4046
4047                 if (vallen != sizeof(obd_id))
4048                         RETURN(-ERANGE);
4049                 if (val == NULL)
4050                         RETURN(-EINVAL);
4051
4052                 if (vallen != sizeof(obd_id))
4053                         RETURN(-EINVAL);
4054
4055                 /* avoid race between allocate new object and set next id
4056                  * from ll_sync thread */
4057                 cfs_spin_lock(&oscc->oscc_lock);
4058                 new_val = *((obd_id*)val) + 1;
4059                 if (new_val > oscc->oscc_next_id)
4060                         oscc->oscc_next_id = new_val;
4061                 cfs_spin_unlock(&oscc->oscc_lock);
4062                 CDEBUG(D_HA, "%s: set oscc_next_id = "LPU64"\n",
4063                        exp->exp_obd->obd_name,
4064                        obd->u.cli.cl_oscc.oscc_next_id);
4065
4066                 RETURN(0);
4067         }
4068
4069         if (KEY_IS(KEY_CHECKSUM)) {
4070                 if (vallen != sizeof(int))
4071                         RETURN(-EINVAL);
4072                 exp->exp_obd->u.cli.cl_checksum = (*(int *)val) ? 1 : 0;
4073                 RETURN(0);
4074         }
4075
4076         if (KEY_IS(KEY_SPTLRPC_CONF)) {
4077                 sptlrpc_conf_client_adapt(obd);
4078                 RETURN(0);
4079         }
4080
4081         if (KEY_IS(KEY_FLUSH_CTX)) {
4082                 sptlrpc_import_flush_my_ctx(imp);
4083                 RETURN(0);
4084         }
4085
4086         if (!set && !KEY_IS(KEY_GRANT_SHRINK))
4087                 RETURN(-EINVAL);
4088
4089         /* We pass all other commands directly to OST. Since nobody calls osc
4090            methods directly and everybody is supposed to go through LOV, we
4091            assume lov checked invalid values for us.
4092            The only recognised values so far are evict_by_nid and mds_conn.
4093            Even if something bad goes through, we'd get a -EINVAL from OST
4094            anyway. */
4095
4096         if (KEY_IS(KEY_GRANT_SHRINK))
4097                 req = ptlrpc_request_alloc(imp, &RQF_OST_SET_GRANT_INFO);
4098         else
4099                 req = ptlrpc_request_alloc(imp, &RQF_OBD_SET_INFO);
4100
4101         if (req == NULL)
4102                 RETURN(-ENOMEM);
4103
4104         req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_KEY,
4105                              RCL_CLIENT, keylen);
4106         req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_VAL,
4107                              RCL_CLIENT, vallen);
4108         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SET_INFO);
4109         if (rc) {
4110                 ptlrpc_request_free(req);
4111                 RETURN(rc);
4112         }
4113
4114         tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
4115         memcpy(tmp, key, keylen);
4116         tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_VAL);
4117         memcpy(tmp, val, vallen);
4118
4119         if (KEY_IS(KEY_MDS_CONN)) {
4120                 struct osc_creator *oscc = &obd->u.cli.cl_oscc;
4121
4122                 oscc->oscc_oa.o_seq = (*(__u32 *)val);
4123                 oscc->oscc_oa.o_valid |= OBD_MD_FLGROUP;
4124                 LASSERT_SEQ_IS_MDT(oscc->oscc_oa.o_seq);
4125                 req->rq_no_delay = req->rq_no_resend = 1;
4126                 req->rq_interpret_reply = osc_setinfo_mds_conn_interpret;
4127         } else if (KEY_IS(KEY_GRANT_SHRINK)) {
4128                 struct osc_grant_args *aa;
4129                 struct obdo *oa;
4130
4131                 CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
4132                 aa = ptlrpc_req_async_args(req);
4133                 OBDO_ALLOC(oa);
4134                 if (!oa) {
4135                         ptlrpc_req_finished(req);
4136                         RETURN(-ENOMEM);
4137                 }
4138                 *oa = ((struct ost_body *)val)->oa;
4139                 aa->aa_oa = oa;
4140                 req->rq_interpret_reply = osc_shrink_grant_interpret;
4141         }
4142
4143         ptlrpc_request_set_replen(req);
4144         if (!KEY_IS(KEY_GRANT_SHRINK)) {
4145                 LASSERT(set != NULL);
4146                 ptlrpc_set_add_req(set, req);
4147                 ptlrpc_check_set(NULL, set);
4148         } else
4149                 ptlrpcd_add_req(req, PSCOPE_OTHER);
4150
4151         RETURN(0);
4152 }
4153
4154
4155 static struct llog_operations osc_size_repl_logops = {
4156         lop_cancel: llog_obd_repl_cancel
4157 };
4158
4159 static struct llog_operations osc_mds_ost_orig_logops;
4160
4161 static int __osc_llog_init(struct obd_device *obd, struct obd_llog_group *olg,
4162                            struct obd_device *tgt, struct llog_catid *catid)
4163 {
4164         int rc;
4165         ENTRY;
4166
4167         rc = llog_setup(obd, &obd->obd_olg, LLOG_MDS_OST_ORIG_CTXT, tgt, 1,
4168                         &catid->lci_logid, &osc_mds_ost_orig_logops);
4169         if (rc) {
4170                 CERROR("failed LLOG_MDS_OST_ORIG_CTXT\n");
4171                 GOTO(out, rc);
4172         }
4173
4174         rc = llog_setup(obd, &obd->obd_olg, LLOG_SIZE_REPL_CTXT, tgt, 1,
4175                         NULL, &osc_size_repl_logops);
4176         if (rc) {
4177                 struct llog_ctxt *ctxt =
4178                         llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
4179                 if (ctxt)
4180                         llog_cleanup(ctxt);
4181                 CERROR("failed LLOG_SIZE_REPL_CTXT\n");
4182         }
4183         GOTO(out, rc);
4184 out:
4185         if (rc) {
4186                 CERROR("osc '%s' tgt '%s' catid %p rc=%d\n",
4187                        obd->obd_name, tgt->obd_name, catid, rc);
4188                 CERROR("logid "LPX64":0x%x\n",
4189                        catid->lci_logid.lgl_oid, catid->lci_logid.lgl_ogen);
4190         }
4191         return rc;
4192 }
4193
4194 static int osc_llog_init(struct obd_device *obd, struct obd_llog_group *olg,
4195                          struct obd_device *disk_obd, int *index)
4196 {
4197         struct llog_catid catid;
4198         static char name[32] = CATLIST;
4199         int rc;
4200         ENTRY;
4201
4202         LASSERT(olg == &obd->obd_olg);
4203
4204         cfs_mutex_down(&olg->olg_cat_processing);
4205         rc = llog_get_cat_list(disk_obd, name, *index, 1, &catid);
4206         if (rc) {
4207                 CERROR("rc: %d\n", rc);
4208                 GOTO(out, rc);
4209         }
4210
4211         CDEBUG(D_INFO, "%s: Init llog for %d - catid "LPX64"/"LPX64":%x\n",
4212                obd->obd_name, *index, catid.lci_logid.lgl_oid,
4213                catid.lci_logid.lgl_oseq, catid.lci_logid.lgl_ogen);
4214
4215         rc = __osc_llog_init(obd, olg, disk_obd, &catid);
4216         if (rc) {
4217                 CERROR("rc: %d\n", rc);
4218                 GOTO(out, rc);
4219         }
4220
4221         rc = llog_put_cat_list(disk_obd, name, *index, 1, &catid);
4222         if (rc) {
4223                 CERROR("rc: %d\n", rc);
4224                 GOTO(out, rc);
4225         }
4226
4227  out:
4228         cfs_mutex_up(&olg->olg_cat_processing);
4229
4230         return rc;
4231 }
4232
4233 static int osc_llog_finish(struct obd_device *obd, int count)
4234 {
4235         struct llog_ctxt *ctxt;
4236         int rc = 0, rc2 = 0;
4237         ENTRY;
4238
4239         ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
4240         if (ctxt)
4241                 rc = llog_cleanup(ctxt);
4242
4243         ctxt = llog_get_context(obd, LLOG_SIZE_REPL_CTXT);
4244         if (ctxt)
4245                 rc2 = llog_cleanup(ctxt);
4246         if (!rc)
4247                 rc = rc2;
4248
4249         RETURN(rc);
4250 }
4251
4252 static int osc_reconnect(const struct lu_env *env,
4253                          struct obd_export *exp, struct obd_device *obd,
4254                          struct obd_uuid *cluuid,
4255                          struct obd_connect_data *data,
4256                          void *localdata)
4257 {
4258         struct client_obd *cli = &obd->u.cli;
4259
4260         if (data != NULL && (data->ocd_connect_flags & OBD_CONNECT_GRANT)) {
4261                 long lost_grant;
4262
4263                 client_obd_list_lock(&cli->cl_loi_list_lock);
4264                 data->ocd_grant = (cli->cl_avail_grant + cli->cl_dirty) ?:
4265                                 2 * cli->cl_max_pages_per_rpc << CFS_PAGE_SHIFT;
4266                 lost_grant = cli->cl_lost_grant;
4267                 cli->cl_lost_grant = 0;
4268                 client_obd_list_unlock(&cli->cl_loi_list_lock);
4269
4270                 CDEBUG(D_CACHE, "request ocd_grant: %d cl_avail_grant: %ld "
4271                        "cl_dirty: %ld cl_lost_grant: %ld\n", data->ocd_grant,
4272                        cli->cl_avail_grant, cli->cl_dirty, lost_grant);
4273                 CDEBUG(D_RPCTRACE, "ocd_connect_flags: "LPX64" ocd_version: %d"
4274                        " ocd_grant: %d\n", data->ocd_connect_flags,
4275                        data->ocd_version, data->ocd_grant);
4276         }
4277
4278         RETURN(0);
4279 }
4280
4281 static int osc_disconnect(struct obd_export *exp)
4282 {
4283         struct obd_device *obd = class_exp2obd(exp);
4284         struct llog_ctxt  *ctxt;
4285         int rc;
4286
4287         ctxt = llog_get_context(obd, LLOG_SIZE_REPL_CTXT);
4288         if (ctxt) {
4289                 if (obd->u.cli.cl_conn_count == 1) {
4290                         /* Flush any remaining cancel messages out to the
4291                          * target */
4292                         llog_sync(ctxt, exp);
4293                 }
4294                 llog_ctxt_put(ctxt);
4295         } else {
4296                 CDEBUG(D_HA, "No LLOG_SIZE_REPL_CTXT found in obd %p\n",
4297                        obd);
4298         }
4299
4300         rc = client_disconnect_export(exp);
4301         /**
4302          * Initially we put del_shrink_grant before disconnect_export, but it
4303          * causes the following problem if setup (connect) and cleanup
4304          * (disconnect) are tangled together.
4305          *      connect p1                     disconnect p2
4306          *   ptlrpc_connect_import
4307          *     ...............               class_manual_cleanup
4308          *                                     osc_disconnect
4309          *                                     del_shrink_grant
4310          *   ptlrpc_connect_interrupt
4311          *     init_grant_shrink
4312          *   add this client to shrink list
4313          *                                      cleanup_osc
4314          * Bang! pinger trigger the shrink.
4315          * So the osc should be disconnected from the shrink list, after we
4316          * are sure the import has been destroyed. BUG18662
4317          */
4318         if (obd->u.cli.cl_import == NULL)
4319                 osc_del_shrink_grant(&obd->u.cli);
4320         return rc;
4321 }
4322
4323 static int osc_import_event(struct obd_device *obd,
4324                             struct obd_import *imp,
4325                             enum obd_import_event event)
4326 {
4327         struct client_obd *cli;
4328         int rc = 0;
4329
4330         ENTRY;
4331         LASSERT(imp->imp_obd == obd);
4332
4333         switch (event) {
4334         case IMP_EVENT_DISCON: {
4335                 /* Only do this on the MDS OSC's */
4336                 if (imp->imp_server_timeout) {
4337                         struct osc_creator *oscc = &obd->u.cli.cl_oscc;
4338
4339                         cfs_spin_lock(&oscc->oscc_lock);
4340                         oscc->oscc_flags |= OSCC_FLAG_RECOVERING;
4341                         cfs_spin_unlock(&oscc->oscc_lock);
4342                 }
4343                 cli = &obd->u.cli;
4344                 client_obd_list_lock(&cli->cl_loi_list_lock);
4345                 cli->cl_avail_grant = 0;
4346                 cli->cl_lost_grant = 0;
4347                 client_obd_list_unlock(&cli->cl_loi_list_lock);
4348                 break;
4349         }
4350         case IMP_EVENT_INACTIVE: {
4351                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_INACTIVE, NULL);
4352                 break;
4353         }
4354         case IMP_EVENT_INVALIDATE: {
4355                 struct ldlm_namespace *ns = obd->obd_namespace;
4356                 struct lu_env         *env;
4357                 int                    refcheck;
4358
4359                 env = cl_env_get(&refcheck);
4360                 if (!IS_ERR(env)) {
4361                         /* Reset grants */
4362                         cli = &obd->u.cli;
4363                         client_obd_list_lock(&cli->cl_loi_list_lock);
4364                         /* all pages go to failing rpcs due to the invalid
4365                          * import */
4366                         osc_check_rpcs(env, cli);
4367                         client_obd_list_unlock(&cli->cl_loi_list_lock);
4368
4369                         ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
4370                         cl_env_put(env, &refcheck);
4371                 } else
4372                         rc = PTR_ERR(env);
4373                 break;
4374         }
4375         case IMP_EVENT_ACTIVE: {
4376                 /* Only do this on the MDS OSC's */
4377                 if (imp->imp_server_timeout) {
4378                         struct osc_creator *oscc = &obd->u.cli.cl_oscc;
4379
4380                         cfs_spin_lock(&oscc->oscc_lock);
4381                         oscc->oscc_flags &= ~OSCC_FLAG_NOSPC;
4382                         cfs_spin_unlock(&oscc->oscc_lock);
4383                 }
4384                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_ACTIVE, NULL);
4385                 break;
4386         }
4387         case IMP_EVENT_OCD: {
4388                 struct obd_connect_data *ocd = &imp->imp_connect_data;
4389
4390                 if (ocd->ocd_connect_flags & OBD_CONNECT_GRANT)
4391                         osc_init_grant(&obd->u.cli, ocd);
4392
4393                 /* See bug 7198 */
4394                 if (ocd->ocd_connect_flags & OBD_CONNECT_REQPORTAL)
4395                         imp->imp_client->cli_request_portal =OST_REQUEST_PORTAL;
4396
4397                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_OCD, NULL);
4398                 break;
4399         }
4400         case IMP_EVENT_DEACTIVATE: {
4401                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_DEACTIVATE, NULL);
4402                 break;
4403         }
4404         case IMP_EVENT_ACTIVATE: {
4405                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_ACTIVATE, NULL);
4406                 break;
4407         }
4408         default:
4409                 CERROR("Unknown import event %d\n", event);
4410                 LBUG();
4411         }
4412         RETURN(rc);
4413 }
4414
4415 /**
4416  * Determine whether the lock can be canceled before replaying the lock
4417  * during recovery, see bug16774 for detailed information.
4418  *
4419  * \retval zero the lock can't be canceled
4420  * \retval other ok to cancel
4421  */
4422 static int osc_cancel_for_recovery(struct ldlm_lock *lock)
4423 {
4424         check_res_locked(lock->l_resource);
4425
4426         /*
4427          * Cancel all unused extent lock in granted mode LCK_PR or LCK_CR.
4428          *
4429          * XXX as a future improvement, we can also cancel unused write lock
4430          * if it doesn't have dirty data and active mmaps.
4431          */
4432         if (lock->l_resource->lr_type == LDLM_EXTENT &&
4433             (lock->l_granted_mode == LCK_PR ||
4434              lock->l_granted_mode == LCK_CR) &&
4435             (osc_dlm_lock_pageref(lock) == 0))
4436                 RETURN(1);
4437
4438         RETURN(0);
4439 }
4440
4441 int osc_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
4442 {
4443         int rc;
4444         ENTRY;
4445
4446         ENTRY;
4447         rc = ptlrpcd_addref();
4448         if (rc)
4449                 RETURN(rc);
4450
4451         rc = client_obd_setup(obd, lcfg);
4452         if (rc) {
4453                 ptlrpcd_decref();
4454         } else {
4455                 struct lprocfs_static_vars lvars = { 0 };
4456                 struct client_obd *cli = &obd->u.cli;
4457
4458                 cli->cl_grant_shrink_interval = GRANT_SHRINK_INTERVAL;
4459                 lprocfs_osc_init_vars(&lvars);
4460                 if (lprocfs_obd_setup(obd, lvars.obd_vars) == 0) {
4461                         lproc_osc_attach_seqstat(obd);
4462                         sptlrpc_lprocfs_cliobd_attach(obd);
4463                         ptlrpc_lprocfs_register_obd(obd);
4464                 }
4465
4466                 oscc_init(obd);
4467                 /* We need to allocate a few requests more, because
4468                    brw_interpret tries to create new requests before freeing
4469                    previous ones. Ideally we want to have 2x max_rpcs_in_flight
4470                    reserved, but I afraid that might be too much wasted RAM
4471                    in fact, so 2 is just my guess and still should work. */
4472                 cli->cl_import->imp_rq_pool =
4473                         ptlrpc_init_rq_pool(cli->cl_max_rpcs_in_flight + 2,
4474                                             OST_MAXREQSIZE,
4475                                             ptlrpc_add_rqs_to_pool);
4476
4477                 CFS_INIT_LIST_HEAD(&cli->cl_grant_shrink_list);
4478                 cfs_sema_init(&cli->cl_grant_sem, 1);
4479
4480                 ns_register_cancel(obd->obd_namespace, osc_cancel_for_recovery);
4481         }
4482
4483         RETURN(rc);
4484 }
4485
4486 static int osc_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
4487 {
4488         int rc = 0;
4489         ENTRY;
4490
4491         switch (stage) {
4492         case OBD_CLEANUP_EARLY: {
4493                 struct obd_import *imp;
4494                 imp = obd->u.cli.cl_import;
4495                 CDEBUG(D_HA, "Deactivating import %s\n", obd->obd_name);
4496                 /* ptlrpc_abort_inflight to stop an mds_lov_synchronize */
4497                 ptlrpc_deactivate_import(imp);
4498                 cfs_spin_lock(&imp->imp_lock);
4499                 imp->imp_pingable = 0;
4500                 cfs_spin_unlock(&imp->imp_lock);
4501                 break;
4502         }
4503         case OBD_CLEANUP_EXPORTS: {
4504                 /* LU-464
4505                  * for echo client, export may be on zombie list, wait for
4506                  * zombie thread to cull it, because cli.cl_import will be
4507                  * cleared in client_disconnect_export():
4508                  *   class_export_destroy() -> obd_cleanup() ->
4509                  *   echo_device_free() -> echo_client_cleanup() ->
4510                  *   obd_disconnect() -> osc_disconnect() ->
4511                  *   client_disconnect_export()
4512                  */
4513                 obd_zombie_barrier();
4514                 /* If we set up but never connected, the
4515                    client import will not have been cleaned. */
4516                 if (obd->u.cli.cl_import) {
4517                         struct obd_import *imp;
4518                         cfs_down_write(&obd->u.cli.cl_sem);
4519                         imp = obd->u.cli.cl_import;
4520                         CDEBUG(D_CONFIG, "%s: client import never connected\n",
4521                                obd->obd_name);
4522                         ptlrpc_invalidate_import(imp);
4523                         if (imp->imp_rq_pool) {
4524                                 ptlrpc_free_rq_pool(imp->imp_rq_pool);
4525                                 imp->imp_rq_pool = NULL;
4526                         }
4527                         class_destroy_import(imp);
4528                         cfs_up_write(&obd->u.cli.cl_sem);
4529                         obd->u.cli.cl_import = NULL;
4530                 }
4531                 rc = obd_llog_finish(obd, 0);
4532                 if (rc != 0)
4533                         CERROR("failed to cleanup llogging subsystems\n");
4534                 break;
4535                 }
4536         }
4537         RETURN(rc);
4538 }
4539
4540 int osc_cleanup(struct obd_device *obd)
4541 {
4542         int rc;
4543
4544         ENTRY;
4545         ptlrpc_lprocfs_unregister_obd(obd);
4546         lprocfs_obd_cleanup(obd);
4547
4548         /* free memory of osc quota cache */
4549         lquota_cleanup(quota_interface, obd);
4550
4551         rc = client_obd_cleanup(obd);
4552
4553         ptlrpcd_decref();
4554         RETURN(rc);
4555 }
4556
4557 int osc_process_config_base(struct obd_device *obd, struct lustre_cfg *lcfg)
4558 {
4559         struct lprocfs_static_vars lvars = { 0 };
4560         int rc = 0;
4561
4562         lprocfs_osc_init_vars(&lvars);
4563
4564         switch (lcfg->lcfg_command) {
4565         default:
4566                 rc = class_process_proc_param(PARAM_OSC, lvars.obd_vars,
4567                                               lcfg, obd);
4568                 if (rc > 0)
4569                         rc = 0;
4570                 break;
4571         }
4572
4573         return(rc);
4574 }
4575
4576 static int osc_process_config(struct obd_device *obd, obd_count len, void *buf)
4577 {
4578         return osc_process_config_base(obd, buf);
4579 }
4580
4581 struct obd_ops osc_obd_ops = {
4582         .o_owner                = THIS_MODULE,
4583         .o_setup                = osc_setup,
4584         .o_precleanup           = osc_precleanup,
4585         .o_cleanup              = osc_cleanup,
4586         .o_add_conn             = client_import_add_conn,
4587         .o_del_conn             = client_import_del_conn,
4588         .o_connect              = client_connect_import,
4589         .o_reconnect            = osc_reconnect,
4590         .o_disconnect           = osc_disconnect,
4591         .o_statfs               = osc_statfs,
4592         .o_statfs_async         = osc_statfs_async,
4593         .o_packmd               = osc_packmd,
4594         .o_unpackmd             = osc_unpackmd,
4595         .o_precreate            = osc_precreate,
4596         .o_create               = osc_create,
4597         .o_create_async         = osc_create_async,
4598         .o_destroy              = osc_destroy,
4599         .o_getattr              = osc_getattr,
4600         .o_getattr_async        = osc_getattr_async,
4601         .o_setattr              = osc_setattr,
4602         .o_setattr_async        = osc_setattr_async,
4603         .o_brw                  = osc_brw,
4604         .o_punch                = osc_punch,
4605         .o_sync                 = osc_sync,
4606         .o_enqueue              = osc_enqueue,
4607         .o_change_cbdata        = osc_change_cbdata,
4608         .o_find_cbdata          = osc_find_cbdata,
4609         .o_cancel               = osc_cancel,
4610         .o_cancel_unused        = osc_cancel_unused,
4611         .o_iocontrol            = osc_iocontrol,
4612         .o_get_info             = osc_get_info,
4613         .o_set_info_async       = osc_set_info_async,
4614         .o_import_event         = osc_import_event,
4615         .o_llog_init            = osc_llog_init,
4616         .o_llog_finish          = osc_llog_finish,
4617         .o_process_config       = osc_process_config,
4618 };
4619
4620 extern struct lu_kmem_descr osc_caches[];
4621 extern cfs_spinlock_t       osc_ast_guard;
4622 extern cfs_lock_class_key_t osc_ast_guard_class;
4623
4624 int __init osc_init(void)
4625 {
4626         struct lprocfs_static_vars lvars = { 0 };
4627         int rc;
4628         ENTRY;
4629
4630         /* print an address of _any_ initialized kernel symbol from this
4631          * module, to allow debugging with gdb that doesn't support data
4632          * symbols from modules.*/
4633         CDEBUG(D_CONSOLE, "Lustre OSC module (%p).\n", &osc_caches);
4634
4635         rc = lu_kmem_init(osc_caches);
4636
4637         lprocfs_osc_init_vars(&lvars);
4638
4639         cfs_request_module("lquota");
4640         quota_interface = PORTAL_SYMBOL_GET(osc_quota_interface);
4641         lquota_init(quota_interface);
4642         init_obd_quota_ops(quota_interface, &osc_obd_ops);
4643
4644         rc = class_register_type(&osc_obd_ops, NULL, lvars.module_vars,
4645                                  LUSTRE_OSC_NAME, &osc_device_type);
4646         if (rc) {
4647                 if (quota_interface)
4648                         PORTAL_SYMBOL_PUT(osc_quota_interface);
4649                 lu_kmem_fini(osc_caches);
4650                 RETURN(rc);
4651         }
4652
4653         cfs_spin_lock_init(&osc_ast_guard);
4654         cfs_lockdep_set_class(&osc_ast_guard, &osc_ast_guard_class);
4655
4656         osc_mds_ost_orig_logops = llog_lvfs_ops;
4657         osc_mds_ost_orig_logops.lop_setup = llog_obd_origin_setup;
4658         osc_mds_ost_orig_logops.lop_cleanup = llog_obd_origin_cleanup;
4659         osc_mds_ost_orig_logops.lop_add = llog_obd_origin_add;
4660         osc_mds_ost_orig_logops.lop_connect = llog_origin_connect;
4661
4662         RETURN(rc);
4663 }
4664
4665 #ifdef __KERNEL__
4666 static void /*__exit*/ osc_exit(void)
4667 {
4668         lu_device_type_fini(&osc_device_type);
4669
4670         lquota_exit(quota_interface);
4671         if (quota_interface)
4672                 PORTAL_SYMBOL_PUT(osc_quota_interface);
4673
4674         class_unregister_type(LUSTRE_OSC_NAME);
4675         lu_kmem_fini(osc_caches);
4676 }
4677
4678 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
4679 MODULE_DESCRIPTION("Lustre Object Storage Client (OSC)");
4680 MODULE_LICENSE("GPL");
4681
4682 cfs_module(osc, LUSTRE_VERSION_STRING, osc_init, osc_exit);
4683 #endif