lustre/osc/osc_request.c

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