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  *  Copyright (C) 2001-2003 Cluster File Systems, Inc.
   5  *   Author Peter Braam <braam@clusterfs.com>
   6  *
   7  *   This file is part of Lustre, http://www.lustre.org.
   8  *
   9  *   Lustre is free software; you can redistribute it and/or
  10  *   modify it under the terms of version 2 of the GNU General Public
  11  *   License as published by the Free Software Foundation.
  12  *
  13  *   Lustre is distributed in the hope that it will be useful,
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *   GNU General Public License for more details.
  17  *
  18  *   You should have received a copy of the GNU General Public License
  19  *   along with Lustre; if not, write to the Free Software
  20  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  *  For testing and management it is treated as an obd_device,
  23  *  although * it does not export a full OBD method table (the
  24  *  requests are coming * in over the wire, so object target modules
  25  *  do not have a full * method table.)
  26  *
  27  */
  28
  29 #ifndef EXPORT_SYMTAB
  30 # define EXPORT_SYMTAB
  31 #endif
  32 #define DEBUG_SUBSYSTEM S_OSC
  33
  34 #ifdef __KERNEL__
  35 # include <linux/version.h>
  36 # include <linux/module.h>
  37 # include <linux/mm.h>
  38 # include <linux/highmem.h>
  39 # include <linux/ctype.h>
  40 # include <linux/init.h>
  41 # if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
  42 #  include <linux/workqueue.h>
  43 #  include <linux/smp_lock.h>
  44 # else
  45 #  include <linux/locks.h>
  46 # endif
  47 #else /* __KERNEL__ */
  48 # include <liblustre.h>
  49 #endif
  50
  51 #include <linux/lustre_dlm.h>
  52 #include <libcfs/kp30.h>
  53 #include <linux/lustre_net.h>
  54 #include <linux/lustre_sec.h>
  55 #include <lustre/lustre_user.h>
  56 #include <linux/obd_ost.h>
  57 #include <linux/obd_lov.h>
  58
  59 #ifdef  __CYGWIN__
  60 # include <ctype.h>
  61 #endif
  62
  63 #include <linux/lustre_ha.h>
  64 #include <linux/lprocfs_status.h>
  65 #include <linux/lustre_log.h>
  66 #include <linux/lustre_lite.h>
  67 #include <linux/lustre_audit.h>
  68 #include <linux/lustre_gs.h>
  69
  70 #include "osc_internal.h"
  71
  72 /* Pack OSC object metadata for disk storage (LE byte order). */
  73 static int osc_packmd(struct obd_export *exp, struct lov_mds_md **lmmp,
  74                       struct lov_stripe_md *lsm)
  75 {
  76         int lmm_size;
  77         ENTRY;
  78
  79         lmm_size = sizeof(**lmmp);
  80         if (!lmmp)
  81                 RETURN(lmm_size);
  82
  83         if (*lmmp && !lsm) {
  84                 OBD_FREE(*lmmp, lmm_size);
  85                 *lmmp = NULL;
  86                 RETURN(0);
  87         }
  88
  89         if (!*lmmp) {
  90                 OBD_ALLOC(*lmmp, lmm_size);
  91                 if (!*lmmp)
  92                         RETURN(-ENOMEM);
  93         }
  94
  95         if (lsm) {
  96                 LASSERT(lsm->lsm_object_id);
  97                 LASSERT(lsm->lsm_object_gr);
  98                 (*lmmp)->lmm_object_id = cpu_to_le64(lsm->lsm_object_id);
  99                 (*lmmp)->lmm_object_gr = cpu_to_le64(lsm->lsm_object_gr);
 100         }
 101
 102         RETURN(lmm_size);
 103 }
 104
 105 /* Unpack OSC object metadata from disk storage (LE byte order). */
 106 static int osc_unpackmd(struct obd_export *exp, struct lov_stripe_md **lsmp,
 107                         struct lov_mds_md *lmm, int lmm_bytes)
 108 {
 109         int lsm_size;
 110         ENTRY;
 111
 112         if (lmm != NULL) {
 113                 if (lmm_bytes < sizeof (*lmm)) {
 114                         CERROR("lov_mds_md too small: %d, need %d\n",
 115                                lmm_bytes, (int)sizeof(*lmm));
 116                         RETURN(-EINVAL);
 117                 }
 118                 /* XXX LOV_MAGIC etc check? */
 119
 120                 if (lmm->lmm_object_id == 0) {
 121                         CERROR("lov_mds_md: zero lmm_object_id\n");
 122                         RETURN(-EINVAL);
 123                 }
 124         }
 125
 126         lsm_size = lov_stripe_md_size(1);
 127         if (lsmp == NULL)
 128                 RETURN(lsm_size);
 129
 130         if (*lsmp != NULL && lmm == NULL) {
 131                 OBD_FREE(*lsmp, lsm_size);
 132                 *lsmp = NULL;
 133                 RETURN(0);
 134         }
 135
 136         if (*lsmp == NULL) {
 137                 OBD_ALLOC(*lsmp, lsm_size);
 138                 if (*lsmp == NULL)
 139                         RETURN(-ENOMEM);
 140                 loi_init((*lsmp)->lsm_oinfo);
 141         }
 142
 143         if (lmm != NULL) {
 144                 /* XXX zero *lsmp? */
 145                 (*lsmp)->lsm_object_id = le64_to_cpu (lmm->lmm_object_id);
 146                 (*lsmp)->lsm_object_gr = le64_to_cpu (lmm->lmm_object_gr);
 147                 LASSERT((*lsmp)->lsm_object_id);
 148                 LASSERT((*lsmp)->lsm_object_gr);
 149         }
 150
 151         (*lsmp)->lsm_maxbytes = LUSTRE_STRIPE_MAXBYTES;
 152
 153         RETURN(lsm_size);
 154 }
 155
 156 static int osc_getattr_interpret(struct ptlrpc_request *req,
 157                                  struct osc_getattr_async_args *aa, int rc)
 158 {
 159         struct ost_body *body;
 160         ENTRY;
 161
 162         if (rc != 0)
 163                 RETURN(rc);
 164
 165         body = lustre_swab_repbuf(req, 0, sizeof(*body), lustre_swab_ost_body);
 166         if (body) {
 167                 CDEBUG(D_INODE, "mode: %o\n", body->oa.o_mode);
 168                 memcpy(aa->aa_oa, &body->oa, sizeof(*aa->aa_oa));
 169
 170                 /* This should really be sent by the OST */
 171                 aa->aa_oa->o_blksize = PTLRPC_MAX_BRW_SIZE;
 172                 aa->aa_oa->o_valid |= OBD_MD_FLBLKSZ;
 173         } else {
 174                 CERROR("can't unpack ost_body\n");
 175                 rc = -EPROTO;
 176                 aa->aa_oa->o_valid = 0;
 177         }
 178
 179         RETURN(rc);
 180 }
 181
 182 static int osc_getattr_async(struct obd_export *exp, struct obdo *oa,
 183                              struct lov_stripe_md *md,
 184                              struct ptlrpc_request_set *set)
 185 {
 186         struct ptlrpc_request *request;
 187         struct ost_body *body;
 188         int size = sizeof(*body);
 189         struct osc_getattr_async_args *aa;
 190         ENTRY;
 191
 192         request = ptlrpc_prep_req(class_exp2cliimp(exp), LUSTRE_OBD_VERSION,
 193                                   OST_GETATTR, 1, &size, NULL);
 194         if (!request)
 195                 RETURN(-ENOMEM);
 196
 197         body = lustre_msg_buf(request->rq_reqmsg, 0, sizeof (*body));
 198         memcpy(&body->oa, oa, sizeof(*oa));
 199
 200         request->rq_replen = lustre_msg_size(1, &size);
 201         request->rq_interpret_reply = osc_getattr_interpret;
 202
 203         LASSERT (sizeof (*aa) <= sizeof (request->rq_async_args));
 204         aa = (struct osc_getattr_async_args *)&request->rq_async_args;
 205         aa->aa_oa = oa;
 206
 207         ptlrpc_set_add_req (set, request);
 208         RETURN (0);
 209 }
 210
 211 static int osc_getattr(struct obd_export *exp, struct obdo *oa,
 212                        struct lov_stripe_md *md)
 213 {
 214         struct ptlrpc_request *request;
 215         struct ost_body *body;
 216         int rc, size = sizeof(*body);
 217         ENTRY;
 218
 219         request = ptlrpc_prep_req(class_exp2cliimp(exp), LUSTRE_OBD_VERSION,
 220                                   OST_GETATTR, 1, &size, NULL);
 221         if (!request)
 222                 RETURN(-ENOMEM);
 223
 224         body = lustre_msg_buf(request->rq_reqmsg, 0, sizeof (*body));
 225         memcpy(&body->oa, oa, sizeof(*oa));
 226
 227         request->rq_replen = lustre_msg_size(1, &size);
 228
 229         rc = ptlrpc_queue_wait(request);
 230         if (rc) {
 231                 CERROR("%s failed: rc = %d\n", __FUNCTION__, rc);
 232                 GOTO(out, rc);
 233         }
 234
 235         body = lustre_swab_repbuf(request, 0, sizeof (*body),
 236                                   lustre_swab_ost_body);
 237         if (body == NULL) {
 238                 CERROR ("can't unpack ost_body\n");
 239                 GOTO (out, rc = -EPROTO);
 240         }
 241
 242         CDEBUG(D_INODE, "mode: %o\n", body->oa.o_mode);
 243         memcpy(oa, &body->oa, sizeof(*oa));
 244
 245         /* This should really be sent by the OST */
 246         oa->o_blksize = PTLRPC_MAX_BRW_SIZE;
 247         oa->o_valid |= OBD_MD_FLBLKSZ;
 248
 249         EXIT;
 250  out:
 251         ptlrpc_req_finished(request);
 252         return rc;
 253 }
 254
 255 static int osc_setattr(struct obd_export *exp, struct obdo *oa,
 256                        struct lov_stripe_md *md, struct obd_trans_info *oti,
 257                        struct lustre_capa *capa)
 258 {
 259         struct ptlrpc_request *request;
 260         struct ost_body *body;
 261         int rc, size = sizeof(*body);
 262         ENTRY;
 263
 264         LASSERT(!(oa->o_valid & OBD_MD_FLGROUP) || oa->o_gr > 0);
 265
 266         request = ptlrpc_prep_req(class_exp2cliimp(exp), LUSTRE_OBD_VERSION,
 267                                   OST_SETATTR, 1, &size, NULL);
 268         if (!request)
 269                 RETURN(-ENOMEM);
 270
 271         body = lustre_msg_buf(request->rq_reqmsg, 0, sizeof(*body));
 272         memcpy(&body->oa, oa, sizeof(*oa));
 273
 274         request->rq_replen = lustre_msg_size(1, &size);
 275
 276         if (oti != NULL && (oti->oti_flags & OBD_MODE_ASYNC)) {
 277                 ptlrpcd_add_req(request);
 278                 rc = 0;
 279         } else {
 280                 rc = ptlrpc_queue_wait(request);
 281                 if (rc)
 282                         GOTO(out, rc);
 283
 284                 body = lustre_swab_repbuf(request, 0, sizeof(*body),
 285                                           lustre_swab_ost_body);
 286                 if (body == NULL)
 287                         GOTO(out, rc = -EPROTO);
 288
 289                 memcpy(oa, &body->oa, sizeof(*oa));
 290         }
 291         EXIT;
 292 out:
 293         ptlrpc_req_finished(request);
 294         RETURN(0);
 295 }
 296
 297 int osc_real_create(struct obd_export *exp, struct obdo *oa,
 298                     struct lov_stripe_md **ea, struct obd_trans_info *oti)
 299 {
 300         struct osc_creator *oscc = &exp->exp_obd->u.cli.cl_oscc;
 301         struct ptlrpc_request *request;
 302         struct ost_body *body;
 303         struct lov_stripe_md *lsm;
 304         int rc, size = sizeof(*body);
 305         ENTRY;
 306
 307         LASSERT(oa);
 308         LASSERT(ea);
 309
 310         lsm = *ea;
 311         if (!lsm) {
 312                 rc = obd_alloc_memmd(exp, &lsm);
 313                 if (rc < 0)
 314                         RETURN(rc);
 315         }
 316
 317         request = ptlrpc_prep_req(class_exp2cliimp(exp), LUSTRE_OBD_VERSION,
 318                                   OST_CREATE, 1, &size, NULL);
 319         if (!request)
 320                 GOTO(out, rc = -ENOMEM);
 321
 322         body = lustre_msg_buf(request->rq_reqmsg, 0, sizeof (*body));
 323         memcpy(&body->oa, oa, sizeof(body->oa));
 324
 325         request->rq_replen = lustre_msg_size(1, &size);
 326         if (oa->o_valid & OBD_MD_FLINLINE) {
 327                 LASSERT((oa->o_valid & OBD_MD_FLFLAGS) &&
 328                         oa->o_flags == OBD_FL_DELORPHAN);
 329                 DEBUG_REQ(D_HA, request,
 330                           "delorphan from OST integration");
 331                 /* Don't resend the delorphan request */
 332                 request->rq_no_resend = request->rq_no_delay = 1;
 333         }
 334
 335         rc = ptlrpc_queue_wait(request);
 336         if (rc)
 337                 GOTO(out_req, rc);
 338
 339         body = lustre_swab_repbuf(request, 0, sizeof(*body),
 340                                   lustre_swab_ost_body);
 341         if (body == NULL) {
 342                 CERROR ("can't unpack ost_body\n");
 343                 GOTO (out_req, rc = -EPROTO);
 344         }
 345
 346         if ((oa->o_valid & OBD_MD_FLFLAGS) && oa->o_flags == OBD_FL_DELORPHAN) {
 347                 struct obd_import *imp = class_exp2cliimp(exp);
 348                 /* MDS declares last known object, OSS responses
 349                  * with next possible object -bzzz */
 350                 spin_lock(&oscc->oscc_lock);
 351                 oscc->oscc_next_id = body->oa.o_id;
 352                 spin_unlock(&oscc->oscc_lock);
 353                 CDEBUG(D_HA, "%s: set nextid "LPD64" after recovery\n",
 354                        imp->imp_target_uuid.uuid, oa->o_id);
 355         }
 356         memcpy(oa, &body->oa, sizeof(*oa));
 357
 358         /* This should really be sent by the OST */
 359         oa->o_blksize = PTLRPC_MAX_BRW_SIZE;
 360         oa->o_valid |= OBD_MD_FLBLKSZ;
 361
 362         /* XXX LOV STACKING: the lsm that is passed to us from LOV does not
 363          * have valid lsm_oinfo data structs, so don't go touching that.
 364          * This needs to be fixed in a big way.
 365          */
 366         lsm->lsm_object_id = oa->o_id;
 367         lsm->lsm_object_gr = oa->o_gr;
 368         *ea = lsm;
 369
 370         if (oti != NULL) {
 371                 oti->oti_transno = request->rq_repmsg->transno;
 372
 373                 if (oa->o_valid & OBD_MD_FLCOOKIE) {
 374                         if (!oti->oti_logcookies)
 375                                 oti_alloc_cookies(oti, 1);
 376                         memcpy(oti->oti_logcookies, obdo_logcookie(oa),
 377                                sizeof(oti->oti_onecookie));
 378                 }
 379         }
 380
 381         CDEBUG(D_HA, "transno: "LPD64"\n", request->rq_repmsg->transno);
 382         EXIT;
 383 out_req:
 384         ptlrpc_req_finished(request);
 385 out:
 386         if (rc && !*ea)
 387                 obd_free_memmd(exp, &lsm);
 388         return rc;
 389 }
 390
 391 static int osc_punch(struct obd_export *exp, struct obdo *oa,
 392                      struct lov_stripe_md *md, obd_size start,
 393                      obd_size end, struct obd_trans_info *oti,
 394                      struct lustre_capa *capa)
 395 {
 396         struct ptlrpc_request *request;
 397         struct ost_body *body;
 398         struct lustre_capa *req_capa;
 399         int bufcnt = 0;
 400         int rc, size[2] = { sizeof(*body), sizeof(*capa) };
 401         ENTRY;
 402
 403         if (!oa) {
 404                 CERROR("oa NULL\n");
 405                 RETURN(-EINVAL);
 406         }
 407
 408         request = ptlrpc_prep_req(class_exp2cliimp(exp), LUSTRE_OBD_VERSION,
 409                                   OST_PUNCH, capa ? 2 : 1, size, NULL);
 410         if (!request)
 411                 RETURN(-ENOMEM);
 412
 413         body = lustre_msg_buf(request->rq_reqmsg, bufcnt++, sizeof (*body));
 414
 415         memcpy(&body->oa, oa, sizeof(*oa));
 416
 417         /* overload the size and blocks fields in the oa with start/end */
 418         body->oa.o_size = start;
 419         body->oa.o_blocks = end;
 420         body->oa.o_valid |= (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS);
 421
 422         if (capa) {
 423                 req_capa = lustre_msg_buf(request->rq_reqmsg, bufcnt++,
 424                                           sizeof(*capa));
 425                 capa_dup2(req_capa, capa);
 426                 body->oa.o_valid |= OBD_MD_CAPA;
 427         }
 428
 429         request->rq_replen = lustre_msg_size(1, size);
 430
 431         rc = ptlrpc_queue_wait(request);
 432         if (rc)
 433                 GOTO(out, rc);
 434
 435         body = lustre_swab_repbuf (request, 0, sizeof (*body),
 436                                    lustre_swab_ost_body);
 437         if (body == NULL) {
 438                 CERROR ("can't unpack ost_body\n");
 439                 GOTO (out, rc = -EPROTO);
 440         }
 441
 442         memcpy(oa, &body->oa, sizeof(*oa));
 443
 444         EXIT;
 445  out:
 446         ptlrpc_req_finished(request);
 447         return rc;
 448 }
 449
 450 static int osc_sync(struct obd_export *exp, struct obdo *oa,
 451                     struct lov_stripe_md *md, obd_size start,
 452                     obd_size end)
 453 {
 454         struct ptlrpc_request *request;
 455         struct ost_body *body;
 456         int rc, size = sizeof(*body);
 457         ENTRY;
 458
 459         if (!oa) {
 460                 CERROR("oa NULL\n");
 461                 RETURN(-EINVAL);
 462         }
 463
 464         request = ptlrpc_prep_req(class_exp2cliimp(exp), LUSTRE_OBD_VERSION,
 465                                   OST_SYNC, 1, &size, NULL);
 466         if (!request)
 467                 RETURN(-ENOMEM);
 468
 469         body = lustre_msg_buf(request->rq_reqmsg, 0, sizeof (*body));
 470         memcpy(&body->oa, oa, sizeof(*oa));
 471
 472         /* overload the size and blocks fields in the oa with start/end */
 473         body->oa.o_size = start;
 474         body->oa.o_blocks = end;
 475         body->oa.o_valid |= (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS);
 476
 477         request->rq_replen = lustre_msg_size(1, &size);
 478
 479         rc = ptlrpc_queue_wait(request);
 480         if (rc)
 481                 GOTO(out, rc);
 482
 483         body = lustre_swab_repbuf(request, 0, sizeof(*body),
 484                                   lustre_swab_ost_body);
 485         if (body == NULL) {
 486                 CERROR ("can't unpack ost_body\n");
 487                 GOTO (out, rc = -EPROTO);
 488         }
 489
 490         memcpy(oa, &body->oa, sizeof(*oa));
 491
 492         EXIT;
 493  out:
 494         ptlrpc_req_finished(request);
 495         return rc;
 496 }
 497
 498 static int osc_destroy(struct obd_export *exp, struct obdo *oa,
 499                        struct lov_stripe_md *ea, struct obd_trans_info *oti)
 500 {
 501         struct ptlrpc_request *request;
 502         struct ost_body *body;
 503         int rc, size = sizeof(*body);
 504         ENTRY;
 505
 506         if (!oa) {
 507                 CERROR("oa NULL\n");
 508                 RETURN(-EINVAL);
 509         }
 510
 511         request = ptlrpc_prep_req(class_exp2cliimp(exp), LUSTRE_OBD_VERSION,
 512                                   OST_DESTROY, 1, &size, NULL);
 513         if (!request)
 514                 RETURN(-ENOMEM);
 515         request->rq_request_portal = OST_DESTROY_PORTAL;
 516
 517         body = lustre_msg_buf(request->rq_reqmsg, 0, sizeof (*body));
 518
 519         if (oti != NULL && oa->o_valid & OBD_MD_FLCOOKIE) {
 520                 memcpy(obdo_logcookie(oa), oti->oti_logcookies,
 521                        sizeof(*oti->oti_logcookies));
 522                 oti->oti_logcookies++;
 523         }
 524
 525         memcpy(&body->oa, oa, sizeof(*oa));
 526         request->rq_replen = lustre_msg_size(1, &size);
 527
 528         if (oti != NULL && (oti->oti_flags & OBD_MODE_ASYNC)) {
 529                 ptlrpcd_add_req(request);
 530                 rc = 0;
 531         } else {
 532                 rc = ptlrpc_queue_wait(request);
 533
 534                 if (rc == -ENOENT)
 535                         rc = 0;
 536
 537                 if (rc) {
 538                         ptlrpc_req_finished(request);
 539                         RETURN(rc);
 540                 }
 541
 542                 body = lustre_swab_repbuf(request, 0, sizeof(*body),
 543                                           lustre_swab_ost_body);
 544                 if (body == NULL) {
 545                         CERROR ("Can't unpack body\n");
 546                         ptlrpc_req_finished(request);
 547                         RETURN(-EPROTO);
 548                 }
 549
 550                 memcpy(oa, &body->oa, sizeof(*oa));
 551                 ptlrpc_req_finished(request);
 552         }
 553         RETURN(rc);
 554 }
 555
 556 static void osc_announce_cached(struct client_obd *cli, struct obdo *oa,
 557                                 long writing_bytes)
 558 {
 559         obd_valid bits = OBD_MD_FLBLOCKS|OBD_MD_FLGRANT;
 560
 561         LASSERT(!(oa->o_valid & bits));
 562
 563         oa->o_valid |= bits;
 564         spin_lock(&cli->cl_loi_list_lock);
 565         oa->o_dirty = cli->cl_dirty;
 566         oa->o_undirty = cli->cl_dirty_max - oa->o_dirty;
 567         oa->o_grant = cli->cl_avail_grant;
 568         oa->o_dropped = cli->cl_lost_grant;
 569         cli->cl_lost_grant = 0;
 570         spin_unlock(&cli->cl_loi_list_lock);
 571         CDEBUG(D_CACHE,"dirty: "LPU64" undirty: %u dropped %u grant: "LPU64"\n",
 572                oa->o_dirty, oa->o_undirty, oa->o_dropped, oa->o_grant);
 573 }
 574
 575 /* caller must hold loi_list_lock */
 576 static void osc_consume_write_grant(struct client_obd *cli,
 577                                     struct osc_async_page *oap)
 578 {
 579         cli->cl_dirty += PAGE_SIZE;
 580         cli->cl_avail_grant -= PAGE_SIZE;
 581         oap->oap_brw_flags |= OBD_BRW_FROM_GRANT;
 582         CDEBUG(D_CACHE, "using %lu grant credits for oap %p\n", PAGE_SIZE, oap);
 583         LASSERT(cli->cl_avail_grant >= 0);
 584 }
 585
 586 static unsigned long rpcs_in_flight(struct client_obd *cli)
 587 {
 588         return cli->cl_r_in_flight + cli->cl_w_in_flight;
 589 }
 590
 591 /* caller must hold loi_list_lock */
 592 void osc_wake_cache_waiters(struct client_obd *cli)
 593 {
 594         struct list_head *l, *tmp;
 595         struct osc_cache_waiter *ocw;
 596
 597         list_for_each_safe(l, tmp, &cli->cl_cache_waiters) {
 598                 /* if we can't dirty more, we must wait until some is written */
 599                 if (cli->cl_dirty + PAGE_SIZE > cli->cl_dirty_max) {
 600                         CDEBUG(D_CACHE, "no dirty room: dirty: %ld max %ld\n",
 601                                cli->cl_dirty, cli->cl_dirty_max);
 602                         return;
 603                 }
 604
 605                 /* if still dirty cache but no grant wait for pending RPCs that
 606                  * may yet return us some grant before doing sync writes */
 607                 if (cli->cl_w_in_flight && cli->cl_avail_grant < PAGE_SIZE) {
 608                         CDEBUG(D_CACHE, "%u BRW writes in flight, no grant\n",
 609                                cli->cl_w_in_flight);
 610                 }
 611                 ocw = list_entry(l, struct osc_cache_waiter, ocw_entry);
 612                 list_del_init(&ocw->ocw_entry);
 613                 if (cli->cl_avail_grant < PAGE_SIZE) {
 614                         /* no more RPCs in flight to return grant, do sync IO */
 615                         ocw->ocw_rc = -EDQUOT;
 616                         CDEBUG(D_INODE, "wake oap %p for sync\n", ocw->ocw_oap);
 617                 } else {
 618                         osc_consume_write_grant(cli, ocw->ocw_oap);
 619                 }
 620
 621                 wake_up(&ocw->ocw_waitq);
 622         }
 623
 624         EXIT;
 625 }
 626
 627 static void osc_update_grant(struct client_obd *cli, struct ost_body *body)
 628 {
 629         spin_lock(&cli->cl_loi_list_lock);
 630         CDEBUG(D_CACHE, "got "LPU64" extra grant\n", body->oa.o_grant);
 631         cli->cl_avail_grant += body->oa.o_grant;
 632         /* waiters are woken in brw_interpret_oap */
 633         spin_unlock(&cli->cl_loi_list_lock);
 634 }
 635
 636 /* We assume that the reason this OSC got a short read is because it read
 637  * beyond the end of a stripe file; i.e. lustre is reading a sparse file
 638  * via the LOV, and it _knows_ it's reading inside the file, it's just that
 639  * this stripe never got written at or beyond this stripe offset yet. */
 640 static void handle_short_read(int nob_read, obd_count page_count,
 641                               struct brw_page *pga)
 642 {
 643         char *ptr;
 644
 645         /* skip bytes read OK */
 646         while (nob_read > 0) {
 647                 LASSERT (page_count > 0);
 648
 649                 if (pga->count > nob_read) {
 650                         /* EOF inside this page */
 651                         ptr = kmap(pga->pg) + (pga->page_offset & ~PAGE_MASK);
 652                         memset(ptr + nob_read, 0, pga->count - nob_read);
 653                         kunmap(pga->pg);
 654                         page_count--;
 655                         pga++;
 656                         break;
 657                 }
 658
 659                 nob_read -= pga->count;
 660                 page_count--;
 661                 pga++;
 662         }
 663
 664         /* zero remaining pages */
 665         while (page_count-- > 0) {
 666                 ptr = kmap(pga->pg) + (pga->page_offset & ~PAGE_MASK);
 667                 memset(ptr, 0, pga->count);
 668                 kunmap(pga->pg);
 669                 pga++;
 670         }
 671 }
 672
 673 static int check_write_rcs(struct ptlrpc_request *request,
 674                            int requested_nob, int niocount,
 675                            obd_count page_count, struct brw_page *pga)
 676 {
 677         int *remote_rcs, i;
 678
 679         /* return error if any niobuf was in error */
 680         remote_rcs = lustre_swab_repbuf(request, 1,
 681                                         sizeof(*remote_rcs) * niocount, NULL);
 682         if (remote_rcs == NULL) {
 683                 CERROR("Missing/short RC vector on BRW_WRITE reply\n");
 684                 return(-EPROTO);
 685         }
 686         if (lustre_msg_swabbed(request->rq_repmsg))
 687                 for (i = 0; i < niocount; i++)
 688                         __swab32s((__u32 *)&remote_rcs[i]);
 689
 690         for (i = 0; i < niocount; i++) {
 691                 if (remote_rcs[i] < 0)
 692                         return(remote_rcs[i]);
 693
 694                 if (remote_rcs[i] != 0) {
 695                         CERROR("rc[%d] invalid (%d) req %p\n",
 696                                 i, remote_rcs[i], request);
 697                         return(-EPROTO);
 698                 }
 699         }
 700
 701         if (request->rq_bulk->bd_nob_transferred != requested_nob) {
 702                 CERROR("Unexpected # bytes transferred: %d (requested %d)\n",
 703                        requested_nob, request->rq_bulk->bd_nob_transferred);
 704                 return(-EPROTO);
 705         }
 706
 707         return (0);
 708 }
 709
 710 static inline int can_merge_pages(struct brw_page *p1, struct brw_page *p2)
 711 {
 712         if (p1->flag != p2->flag) {
 713                 unsigned mask = ~OBD_BRW_FROM_GRANT;
 714
 715                 /* warn if we try to combine flags that we don't know to be
 716                  * safe to combine */
 717                 if ((p1->flag & mask) != (p2->flag & mask))
 718                         CERROR("is it ok to have flags 0x%x and 0x%x in the "
 719                                "same brw?\n", p1->flag, p2->flag);
 720                 return 0;
 721         }
 722
 723         return (p1->disk_offset + p1->count == p2->disk_offset);
 724 }
 725
 726 #if CHECKSUM_BULK
 727 static obd_count cksum_pages(int nob, obd_count page_count,
 728                              struct brw_page *pga)
 729 {
 730         obd_count cksum = 0;
 731         char *ptr;
 732
 733         while (nob > 0) {
 734                 LASSERT (page_count > 0);
 735
 736                 ptr = kmap(pga->pg);
 737                 ost_checksum(&cksum, ptr + (pga->off & (PAGE_SIZE - 1)),
 738                              pga->count > nob ? nob : pga->count);
 739                 kunmap(pga->pg);
 740
 741                 nob -= pga->count;
 742                 page_count--;
 743                 pga++;
 744         }
 745
 746         return (cksum);
 747 }
 748 #endif
 749
 750 #define osc_encrypt_page(page, off, count)  \
 751         osc_crypt_page(page, off, count, ENCRYPT_DATA)
 752 #define osc_decrypt_page(page, off, count)  \
 753         osc_crypt_page(page, off, count, DECRYPT_DATA)
 754 /*Put a global call back var here is Ugly, but put it to client_obd
 755  *also seems not a good idea, WangDi*/
 756 crypt_cb_t  osc_crypt_cb = NULL;
 757
 758 static int osc_crypt_page(struct page *page, obd_off page_off, obd_off count,
 759                           int flags)
 760 {
 761         int rc = 0;
 762         ENTRY;
 763
 764         if (osc_crypt_cb != NULL)
 765                 rc = osc_crypt_cb(page, page_off, count, flags);
 766         if (rc != 0)
 767                 CERROR("crypt page error %d \n", rc);
 768         RETURN(rc);
 769 }
 770
 771 static int osc_decrypt_pages(struct brw_page *pga, int page_count)
 772 {
 773         int i =0;
 774         ENTRY;
 775
 776         for (i = 0; i < page_count; i++) {
 777                 struct brw_page *pg = &pga[i];
 778                 osc_decrypt_page(pg->pg, pg->page_offset, pg->count);
 779         }
 780         RETURN(0);
 781 }
 782
 783 static int osc_brw_prep_request(int cmd, struct obd_import *imp,struct obdo *oa,
 784                                 struct lov_stripe_md *lsm, obd_count page_count,
 785                                 struct brw_page *pga, int *requested_nobp,
 786                                 int *niocountp, struct ptlrpc_request **reqp)
 787 {
 788         struct ptlrpc_request   *req;
 789         struct ptlrpc_bulk_desc *desc;
 790         struct client_obd       *cli = &imp->imp_obd->u.cli;
 791         struct ost_body         *body;
 792         struct lustre_id        *raw_id = obdo_id(oa);
 793         struct obd_capa         *ocapa = NULL;
 794         struct lustre_capa      *capa = NULL;
 795         struct obd_ioobj        *ioobj;
 796         struct niobuf_remote    *niobuf;
 797         int                      niocount;
 798         int                      size[4];
 799         int                      i, bufcnt = 0;
 800         int                      requested_nob;
 801         int                      opc;
 802         int                      capa_op;
 803         int                      rc;
 804
 805         opc = ((cmd & OBD_BRW_WRITE) != 0) ? OST_WRITE : OST_READ;
 806
 807         for (niocount = i = 1; i < page_count; i++)
 808                 if (!can_merge_pages(&pga[i - 1], &pga[i]))
 809                         niocount++;
 810
 811         /* TODO: this could be optimized: thie capability can be
 812          * found from ll_inode_info->lli_capas. */
 813         capa_op = (opc == OST_WRITE) ? CAPA_WRITE : CAPA_READ;
 814 get_capa:
 815         ocapa = capa_get(oa->o_fsuid, capa_op, raw_id->li_fid.lf_group,
 816                          raw_id->li_stc.u.e3s.l3s_ino, CLIENT_CAPA);
 817         if (!ocapa) {
 818                 if (opc == OST_READ && capa_op == MAY_READ) {
 819                         /* partial write might cause read, MAY_WRITE capability
 820                          * should be used here */
 821                         capa_op = MAY_WRITE;
 822                         goto get_capa;
 823                 }
 824         }
 825
 826         size[bufcnt++] = sizeof(*body);
 827         size[bufcnt++] = sizeof(*ioobj);
 828         if (ocapa)
 829                 size[bufcnt++] = sizeof(*capa);
 830         size[bufcnt++] = niocount * sizeof(*niobuf);
 831
 832         req = ptlrpc_prep_req(imp, LUSTRE_OBD_VERSION, opc, bufcnt, size, NULL);
 833         if (req == NULL)
 834                 return (-ENOMEM);
 835
 836         if (opc == OST_WRITE)
 837                 desc = ptlrpc_prep_bulk_imp (req, page_count,
 838                                              BULK_GET_SOURCE, OST_BULK_PORTAL);
 839         else
 840                 desc = ptlrpc_prep_bulk_imp (req, page_count,
 841                                              BULK_PUT_SINK, OST_BULK_PORTAL);
 842         if (desc == NULL)
 843                 GOTO(out, rc = -ENOMEM);
 844         /* NB request now owns desc and will free it when it gets freed */
 845
 846         bufcnt = 0;
 847         body = lustre_msg_buf(req->rq_reqmsg, bufcnt++, sizeof(*body));
 848         memcpy(&body->oa, oa, sizeof(*oa));
 849         ioobj = lustre_msg_buf(req->rq_reqmsg, bufcnt++, sizeof(*ioobj));
 850         if (ocapa) {
 851                 capa = lustre_msg_buf(req->rq_reqmsg, bufcnt++, sizeof(*capa));
 852                 capa_dup(capa, ocapa);
 853                 body->oa.o_valid |= OBD_MD_CAPA;
 854         }
 855         niobuf = lustre_msg_buf(req->rq_reqmsg, bufcnt++,
 856                                 niocount * sizeof(*niobuf));
 857
 858         obdo_to_ioobj(oa, ioobj);
 859         ioobj->ioo_bufcnt = niocount;
 860
 861         LASSERT (page_count > 0);
 862
 863         for (requested_nob = i = 0; i < page_count; i++, niobuf++) {
 864                 struct brw_page *pg = &pga[i];
 865                 struct brw_page *pg_prev = pg - 1;
 866
 867                 LASSERT(pg->count > 0);
 868                 LASSERTF((pg->page_offset & ~PAGE_MASK)+ pg->count <= PAGE_SIZE,
 869                          "i: %d pg: %p pg_off: "LPU64", count: %u\n", i, pg,
 870                          pg->page_offset, pg->count);
 871                 LASSERTF(i == 0 || pg->disk_offset > pg_prev->disk_offset,
 872                          "i %d p_c %u pg %p [pri %lu ind %lu] off "LPU64
 873                          " prev_pg %p [pri %lu ind %lu] off "LPU64"\n",
 874                          i, page_count,
 875                          pg->pg, pg->pg->private, pg->pg->index, pg->disk_offset,
 876                          pg_prev->pg, pg_prev->pg->private, pg_prev->pg->index,
 877                          pg_prev->disk_offset);
 878
 879                 if (opc == OST_WRITE) {
 880                         rc = osc_encrypt_page(pg->pg, pg->page_offset, pg->count);
 881                         if (rc)
 882                                 GOTO(out, rc);
 883                 }
 884
 885                 ptlrpc_prep_bulk_page(desc, pg->pg,
 886                                       pg->page_offset & ~PAGE_MASK, pg->count);
 887                 requested_nob += pg->count;
 888
 889                 if (i > 0 && can_merge_pages(pg_prev, pg)) {
 890                         niobuf--;
 891                         niobuf->len += pg->count;
 892                 } else {
 893                         niobuf->offset = pg->disk_offset;
 894                         niobuf->len    = pg->count;
 895                         niobuf->flags  = pg->flag;
 896                 }
 897         }
 898
 899         LASSERT((void *)(niobuf - niocount) ==
 900                 lustre_msg_buf(req->rq_reqmsg, bufcnt - 1,
 901                                niocount * sizeof(*niobuf)));
 902         osc_announce_cached(cli, &body->oa, opc == OST_WRITE ? requested_nob:0);
 903
 904         /* size[0] still sizeof (*body) */
 905         if (opc == OST_WRITE) {
 906 #if CHECKSUM_BULK
 907                 body->oa.o_valid |= OBD_MD_FLCKSUM;
 908                 body->oa.o_cksum = cksum_pages(requested_nob, page_count, pga);
 909 #endif
 910                 /* 1 RC per niobuf */
 911                 size[1] = sizeof(__u32) * niocount;
 912                 req->rq_replen = lustre_msg_size(2, size);
 913         } else {
 914                 /* 1 RC for the whole I/O */
 915                 req->rq_replen = lustre_msg_size(1, size);
 916         }
 917
 918         *niocountp = niocount;
 919         *requested_nobp = requested_nob;
 920         *reqp = req;
 921         return (0);
 922
 923  out:
 924         ptlrpc_req_finished (req);
 925         return (rc);
 926 }
 927
 928 static int osc_brw_fini_request(struct ptlrpc_request *req, struct obdo *oa,
 929                                 int requested_nob, int niocount,
 930                                 obd_count page_count, struct brw_page *pga,
 931                                 int rc)
 932 {
 933         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
 934         struct ost_body *body;
 935         ENTRY;
 936
 937         if (rc < 0)
 938                 RETURN(rc);
 939
 940         body = lustre_swab_repbuf(req, 0, sizeof(*body), lustre_swab_ost_body);
 941         if (body == NULL) {
 942                 CERROR ("Can't unpack body\n");
 943                 RETURN(-EPROTO);
 944         }
 945
 946         osc_update_grant(cli, body);
 947         memcpy(oa, &body->oa, sizeof(*oa));
 948
 949         if (req->rq_reqmsg->opc == OST_WRITE) {
 950                 if (rc > 0) {
 951                         CERROR ("Unexpected +ve rc %d\n", rc);
 952                         RETURN(-EPROTO);
 953                 }
 954                 LASSERT (req->rq_bulk->bd_nob == requested_nob);
 955                 osc_decrypt_pages(pga, page_count);
 956                 RETURN(check_write_rcs(req, requested_nob, niocount,
 957                                        page_count, pga));
 958         }
 959
 960         if (rc > requested_nob) {
 961                 CERROR("Unexpected rc %d (%d requested)\n", rc, requested_nob);
 962                 RETURN(-EPROTO);
 963         }
 964
 965         if (rc != req->rq_bulk->bd_nob_transferred) {
 966                 CERROR ("Unexpected rc %d (%d transferred)\n",
 967                         rc, req->rq_bulk->bd_nob_transferred);
 968                 return (-EPROTO);
 969         }
 970
 971         if (rc < requested_nob)
 972                 handle_short_read(rc, page_count, pga);
 973
 974 #if CHECKSUM_BULK
 975         if (oa->o_valid & OBD_MD_FLCKSUM) {
 976                 const struct ptlrpc_peer *peer =
 977                         &req->rq_import->imp_connection->c_peer;
 978                 static int cksum_counter;
 979                 obd_count server_cksum = oa->o_cksum;
 980                 obd_count cksum = cksum_pages(rc, page_count, pga);
 981                 char str[PTL_NALFMT_SIZE];
 982
 983                 ptlrpc_peernid2str(peer, str);
 984
 985                 cksum_counter++;
 986                 if (server_cksum != cksum) {
 987                         CERROR("Bad checksum: server %x, client %x, server NID "
 988                                LPX64" (%s)\n", server_cksum, cksum,
 989                                peer->peer_id.nid, str);
 990                         cksum_counter = 0;
 991                         oa->o_cksum = cksum;
 992                 } else if ((cksum_counter & (-cksum_counter)) == cksum_counter){
 993                         CWARN("Checksum %u from "LPX64" (%s) OK: %x\n",
 994                               cksum_counter, peer->peer_id.nid, str, cksum);
 995                 }
 996         } else {
 997                 static int cksum_missed;
 998
 999                 cksum_missed++;
1000                 if ((cksum_missed & (-cksum_missed)) == cksum_missed)
1001                         CERROR("Request checksum %u from "LPX64", no reply\n",
1002                                cksum_missed,
1003                                req->rq_import->imp_connection->c_peer.peer_id.nid);
1004         }
1005 #endif
1006         osc_decrypt_pages(pga, page_count);
1007         RETURN(0);
1008 }
1009
1010 static int osc_brw_internal(int cmd, struct obd_export *exp,struct obdo *oa,
1011                             struct lov_stripe_md *lsm,
1012                             obd_count page_count, struct brw_page *pga)
1013 {
1014         int                    requested_nob;
1015         int                    niocount;
1016         struct ptlrpc_request *request;
1017         int                    rc;
1018         ENTRY;
1019
1020 restart_bulk:
1021         rc = osc_brw_prep_request(cmd, class_exp2cliimp(exp), oa, lsm,
1022                                   page_count, pga, &requested_nob, &niocount,
1023                                   &request);
1024         if (rc != 0)
1025                 return (rc);
1026
1027         rc = ptlrpc_queue_wait(request);
1028
1029         if (rc == -ETIMEDOUT && request->rq_resend) {
1030                 DEBUG_REQ(D_HA, request,  "BULK TIMEOUT");
1031                 ptlrpc_req_finished(request);
1032                 goto restart_bulk;
1033         }
1034
1035         rc = osc_brw_fini_request(request, oa, requested_nob, niocount,
1036                                   page_count, pga, rc);
1037
1038         ptlrpc_req_finished(request);
1039         RETURN (rc);
1040 }
1041
1042 static int brw_interpret(struct ptlrpc_request *request,
1043                          struct osc_brw_async_args *aa, int rc)
1044 {
1045         struct obdo *oa      = aa->aa_oa;
1046         int requested_nob    = aa->aa_requested_nob;
1047         int niocount         = aa->aa_nio_count;
1048         obd_count page_count = aa->aa_page_count;
1049         struct brw_page *pga = aa->aa_pga;
1050         ENTRY;
1051
1052         rc = osc_brw_fini_request(request, oa, requested_nob, niocount,
1053                                   page_count, pga, rc);
1054         RETURN (rc);
1055 }
1056
1057 static int async_internal(int cmd, struct obd_export *exp, struct obdo *oa,
1058                           struct lov_stripe_md *lsm, obd_count page_count,
1059                           struct brw_page *pga, struct ptlrpc_request_set *set)
1060 {
1061         struct ptlrpc_request     *request;
1062         int                        requested_nob;
1063         int                        nio_count;
1064         struct osc_brw_async_args *aa;
1065         int                        rc;
1066         ENTRY;
1067
1068         rc = osc_brw_prep_request(cmd, class_exp2cliimp(exp), oa, lsm,
1069                                   page_count, pga, &requested_nob, &nio_count,
1070                                   &request);
1071         if (rc == 0) {
1072                 LASSERT(sizeof(*aa) <= sizeof(request->rq_async_args));
1073                 aa = (struct osc_brw_async_args *)&request->rq_async_args;
1074                 aa->aa_oa = oa;
1075                 aa->aa_requested_nob = requested_nob;
1076                 aa->aa_nio_count = nio_count;
1077                 aa->aa_page_count = page_count;
1078                 aa->aa_pga = pga;
1079
1080                 request->rq_interpret_reply = brw_interpret;
1081                 ptlrpc_set_add_req(set, request);
1082         }
1083         RETURN (rc);
1084 }
1085
1086 #ifndef min_t
1087 #define min_t(type,x,y) \
1088         ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
1089 #endif
1090
1091 /*
1092  * ugh, we want disk allocation on the target to happen in offset order.  we'll
1093  * follow sedgewicks advice and stick to the dead simple shellsort -- it'll do
1094  * fine for our small page arrays and doesn't require allocation.  its an
1095  * insertion sort that swaps elements that are strides apart, shrinking the
1096  * stride down until its '1' and the array is sorted.
1097  */
1098 static void sort_brw_pages(struct brw_page *array, int num)
1099 {
1100         int stride, i, j;
1101         struct brw_page tmp;
1102
1103         if (num == 1)
1104                 return;
1105         for (stride = 1; stride < num ; stride = (stride * 3) + 1)
1106                 ;
1107
1108         do {
1109                 stride /= 3;
1110                 for (i = stride ; i < num ; i++) {
1111                         tmp = array[i];
1112                         j = i;
1113                         while (j >= stride && array[j - stride].disk_offset >
1114                                 tmp.disk_offset) {
1115                                 array[j] = array[j - stride];
1116                                 j -= stride;
1117                         }
1118                         array[j] = tmp;
1119                 }
1120         } while (stride > 1);
1121 }
1122
1123 /* make sure we the regions we're passing to elan don't violate its '4
1124  * fragments' constraint.  portal headers are a fragment, all full
1125  * PAGE_SIZE long pages count as 1 fragment, and each partial page
1126  * counts as a fragment.  I think.  see bug 934. */
1127 static obd_count check_elan_limit(struct brw_page *pg, obd_count pages)
1128 {
1129         int frags_left = 3;
1130         int saw_whole_frag = 0;
1131         int i;
1132
1133         for (i = 0 ; frags_left && i < pages ; pg++, i++) {
1134                 if (pg->count == PAGE_SIZE) {
1135                         if (!saw_whole_frag) {
1136                                 saw_whole_frag = 1;
1137                                 frags_left--;
1138                         }
1139                 } else {
1140                         frags_left--;
1141                 }
1142         }
1143         return i;
1144 }
1145
1146 static int osc_brw(int cmd, struct obd_export *exp, struct obdo *oa,
1147                    struct lov_stripe_md *lsm, obd_count page_count,
1148                    struct brw_page *pga, struct obd_trans_info *oti)
1149 {
1150         ENTRY;
1151
1152         if (cmd == OBD_BRW_CHECK) {
1153                 /* The caller just wants to know if there's a chance that this
1154                  * I/O can succeed */
1155                 struct obd_import *imp = class_exp2cliimp(exp);
1156
1157                 if (imp == NULL || imp->imp_invalid)
1158                         RETURN(-EIO);
1159                 RETURN(0);
1160         }
1161
1162         while (page_count) {
1163                 obd_count pages_per_brw;
1164                 int rc;
1165
1166                 if (page_count > PTLRPC_MAX_BRW_PAGES)
1167                         pages_per_brw = PTLRPC_MAX_BRW_PAGES;
1168                 else
1169                         pages_per_brw = page_count;
1170
1171                 sort_brw_pages(pga, pages_per_brw);
1172                 pages_per_brw = check_elan_limit(pga, pages_per_brw);
1173
1174                 rc = osc_brw_internal(cmd, exp, oa, lsm, pages_per_brw, pga);
1175
1176                 if (rc != 0)
1177                         RETURN(rc);
1178
1179                 page_count -= pages_per_brw;
1180                 pga += pages_per_brw;
1181         }
1182         RETURN(0);
1183 }
1184
1185 static int osc_brw_async(int cmd, struct obd_export *exp, struct obdo *oa,
1186                          struct lov_stripe_md *lsm, obd_count page_count,
1187                          struct brw_page *pga, struct ptlrpc_request_set *set,
1188                          struct obd_trans_info *oti)
1189 {
1190         ENTRY;
1191
1192         if (cmd == OBD_BRW_CHECK) {
1193                 /* The caller just wants to know if there's a chance that this
1194                  * I/O can succeed */
1195                 struct obd_import *imp = class_exp2cliimp(exp);
1196
1197                 if (imp == NULL || imp->imp_invalid)
1198                         RETURN(-EIO);
1199                 RETURN(0);
1200         }
1201
1202         while (page_count) {
1203                 obd_count pages_per_brw;
1204                 int rc;
1205
1206                 if (page_count > PTLRPC_MAX_BRW_PAGES)
1207                         pages_per_brw = PTLRPC_MAX_BRW_PAGES;
1208                 else
1209                         pages_per_brw = page_count;
1210
1211                 sort_brw_pages(pga, pages_per_brw);
1212                 pages_per_brw = check_elan_limit(pga, pages_per_brw);
1213
1214                 rc = async_internal(cmd, exp, oa, lsm, pages_per_brw, pga, set);
1215
1216                 if (rc != 0)
1217                         RETURN(rc);
1218
1219                 page_count -= pages_per_brw;
1220                 pga += pages_per_brw;
1221         }
1222         RETURN(0);
1223 }
1224
1225 static void osc_check_rpcs(struct client_obd *cli);
1226 static void osc_exit_cache(struct client_obd *cli, struct osc_async_page *oap,
1227                            int sent);
1228 static void loi_list_maint(struct client_obd *cli, struct lov_oinfo *loi);
1229 static void lop_update_pending(struct client_obd *cli,
1230                                struct loi_oap_pages *lop, int cmd, int delta);
1231
1232 /* this is called when a sync waiter receives an interruption.  Its job is to
1233  * get the caller woken as soon as possible.  If its page hasn't been put in an
1234  * rpc yet it can dequeue immediately.  Otherwise it has to mark the rpc as
1235  * desiring interruption which will forcefully complete the rpc once the rpc
1236  * has timed out */
1237 static void osc_occ_interrupted(struct oig_callback_context *occ)
1238 {
1239         struct osc_async_page *oap;
1240         struct loi_oap_pages *lop;
1241         struct lov_oinfo *loi;
1242         ENTRY;
1243
1244         /* XXX member_of() */
1245         oap = list_entry(occ, struct osc_async_page, oap_occ);
1246
1247         spin_lock(&oap->oap_cli->cl_loi_list_lock);
1248
1249         oap->oap_interrupted = 1;
1250
1251         /* ok, it's been put in an rpc. */
1252         if (oap->oap_request != NULL) {
1253                 ptlrpc_mark_interrupted(oap->oap_request);
1254                 ptlrpcd_wake(oap->oap_request);
1255                 GOTO(unlock, 0);
1256         }
1257
1258         /* we don't get interruption callbacks until osc_trigger_sync_io()
1259          * has been called and put the sync oaps in the pending/urgent lists.*/
1260         if (!list_empty(&oap->oap_pending_item)) {
1261                 list_del_init(&oap->oap_pending_item);
1262                 if (oap->oap_async_flags & ASYNC_URGENT)
1263                         list_del_init(&oap->oap_urgent_item);
1264
1265                 loi = oap->oap_loi;
1266                 lop = (oap->oap_cmd == OBD_BRW_WRITE) ?
1267                         &loi->loi_write_lop : &loi->loi_read_lop;
1268                 lop_update_pending(oap->oap_cli, lop, oap->oap_cmd, -1);
1269                 loi_list_maint(oap->oap_cli, oap->oap_loi);
1270
1271                 oig_complete_one(oap->oap_oig, &oap->oap_occ, 0);
1272                 oap->oap_oig = NULL;
1273         }
1274
1275 unlock:
1276         spin_unlock(&oap->oap_cli->cl_loi_list_lock);
1277 }
1278
1279 /* this must be called holding the loi list lock to give coverage to exit_cache,
1280  * async_flag maintenance, and oap_request */
1281 static void osc_ap_completion(struct client_obd *cli, struct obdo *oa,
1282                               struct osc_async_page *oap, int sent, int rc)
1283 {
1284         osc_exit_cache(cli, oap, sent);
1285         oap->oap_async_flags = 0;
1286         oap->oap_interrupted = 0;
1287
1288         if (oap->oap_request != NULL) {
1289                 ptlrpc_req_finished(oap->oap_request);
1290                 oap->oap_request = NULL;
1291         }
1292
1293         if (rc == 0 && oa != NULL)
1294                 oap->oap_loi->loi_blocks = oa->o_blocks;
1295
1296         if (oap->oap_oig) {
1297                 oig_complete_one(oap->oap_oig, &oap->oap_occ, rc);
1298                 oap->oap_oig = NULL;
1299                 EXIT;
1300                 return;
1301         }
1302
1303         oap->oap_caller_ops->ap_completion(oap->oap_caller_data, oap->oap_cmd,
1304                                            oa, rc);
1305 }
1306
1307 static int brw_interpret_oap(struct ptlrpc_request *request,
1308                              struct osc_brw_async_args *aa, int rc)
1309 {
1310         struct osc_async_page *oap;
1311         struct client_obd *cli;
1312         struct list_head *pos, *n;
1313         struct timeval now;
1314         ENTRY;
1315
1316         do_gettimeofday(&now);
1317         rc = osc_brw_fini_request(request, aa->aa_oa, aa->aa_requested_nob,
1318                                   aa->aa_nio_count, aa->aa_page_count,
1319                                   aa->aa_pga, rc);
1320
1321         CDEBUG(D_INODE, "request %p aa %p rc %d\n", request, aa, rc);
1322
1323         cli = aa->aa_cli;
1324
1325         /* in failout recovery we ignore writeback failure and want
1326          * to just tell llite to unlock the page and continue */
1327         if (request->rq_reqmsg->opc == OST_WRITE &&
1328             (cli->cl_import == NULL || cli->cl_import->imp_invalid)) {
1329                 CDEBUG(D_INODE, "flipping to rc 0 imp %p inv %d\n",
1330                        cli->cl_import,
1331                        cli->cl_import ? cli->cl_import->imp_invalid : -1);
1332                 rc = 0;
1333         }
1334
1335         spin_lock(&cli->cl_loi_list_lock);
1336
1337         if (request->rq_reqmsg->opc == OST_WRITE)
1338                 lprocfs_stime_record(&cli->cl_write_stime, &now,
1339                                      &request->rq_rpcd_start);
1340         else
1341                 lprocfs_stime_record(&cli->cl_read_stime, &now,
1342                                      &request->rq_rpcd_start);
1343
1344         /* We need to decrement before osc_ap_completion->osc_wake_cache_waiters
1345          * is called so we know whether to go to sync BRWs or wait for more
1346          * RPCs to complete */
1347         if (request->rq_reqmsg->opc == OST_WRITE)
1348                 cli->cl_w_in_flight--;
1349         else
1350                 cli->cl_r_in_flight--;
1351
1352         /* the caller may re-use the oap after the completion call so
1353          * we need to clean it up a little */
1354         list_for_each_safe(pos, n, &aa->aa_oaps) {
1355                 oap = list_entry(pos, struct osc_async_page, oap_rpc_item);
1356
1357                 //CDEBUG(D_INODE, "page %p index %lu oap %p\n",
1358                        //oap->oap_page, oap->oap_page->index, oap);
1359
1360                 list_del_init(&oap->oap_rpc_item);
1361                 osc_ap_completion(cli, aa->aa_oa, oap, 1, rc);
1362         }
1363
1364         /* no write RPCs in flight, reset the time */
1365         if (request->rq_reqmsg->opc == OST_WRITE && cli->cl_w_in_flight == 0)
1366                 do_gettimeofday(&cli->cl_last_write_time);
1367
1368         osc_wake_cache_waiters(cli);
1369         osc_check_rpcs(cli);
1370         spin_unlock(&cli->cl_loi_list_lock);
1371
1372         obdo_free(aa->aa_oa);
1373         OBD_FREE(aa->aa_pga, aa->aa_page_count * sizeof(struct brw_page));
1374
1375         RETURN(0);
1376 }
1377
1378 static struct ptlrpc_request *osc_build_req(struct client_obd *cli,
1379                                             struct list_head *rpc_list,
1380                                             int page_count, int cmd)
1381 {
1382         struct ptlrpc_request *req;
1383         struct brw_page *pga = NULL;
1384         int requested_nob, nio_count;
1385         struct osc_brw_async_args *aa;
1386         struct obdo *oa = NULL;
1387         struct obd_async_page_ops *ops = NULL;
1388         void *caller_data = NULL;
1389         struct list_head *pos;
1390         int i, rc;
1391
1392         LASSERT(!list_empty(rpc_list));
1393
1394         OBD_ALLOC(pga, sizeof(*pga) * page_count);
1395         if (pga == NULL)
1396                 RETURN(ERR_PTR(-ENOMEM));
1397
1398         oa = obdo_alloc();
1399         if (oa == NULL)
1400                 GOTO(out, req = ERR_PTR(-ENOMEM));
1401
1402         i = 0;
1403         list_for_each(pos, rpc_list) {
1404                 struct osc_async_page *oap;
1405
1406                 oap = list_entry(pos, struct osc_async_page, oap_rpc_item);
1407                 if (ops == NULL) {
1408                         ops = oap->oap_caller_ops;
1409                         caller_data = oap->oap_caller_data;
1410                 }
1411                 pga[i].disk_offset = oap->oap_obj_off + oap->oap_page_off;
1412                 pga[i].page_offset = pga[i].disk_offset;
1413                 pga[i].pg = oap->oap_page;
1414                 pga[i].count = oap->oap_count;
1415                 pga[i].flag = oap->oap_brw_flags;
1416                 CDEBUG(0, "put page %p index %lu oap %p flg %x to pga\n",
1417                        pga[i].pg, oap->oap_page->index, oap, pga[i].flag);
1418                 i++;
1419         }
1420
1421         /* always get the data for the obdo for the rpc */
1422         LASSERT(ops != NULL);
1423         ops->ap_fill_obdo(caller_data, cmd, oa);
1424
1425         sort_brw_pages(pga, page_count);
1426         rc = osc_brw_prep_request(cmd, cli->cl_import, oa, NULL, page_count,
1427                                   pga, &requested_nob, &nio_count, &req);
1428         if (rc != 0) {
1429                 CERROR("prep_req failed: %d\n", rc);
1430                 GOTO(out, req = ERR_PTR(rc));
1431         }
1432
1433         LASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
1434         aa = (struct osc_brw_async_args *)&req->rq_async_args;
1435         aa->aa_oa = oa;
1436         aa->aa_requested_nob = requested_nob;
1437         aa->aa_nio_count = nio_count;
1438         aa->aa_page_count = page_count;
1439         aa->aa_pga = pga;
1440         aa->aa_cli = cli;
1441
1442 out:
1443         if (IS_ERR(req)) {
1444                 if (oa)
1445                         obdo_free(oa);
1446                 if (pga)
1447                         OBD_FREE(pga, sizeof(*pga) * page_count);
1448         }
1449         RETURN(req);
1450 }
1451
1452 /* strange write gap too long (15s) */
1453 #define CLI_ODD_WRITE_GAP 15000000
1454
1455 static void lop_update_pending(struct client_obd *cli,
1456                                struct loi_oap_pages *lop, int cmd, int delta)
1457 {
1458         lop->lop_num_pending += delta;
1459         if (cmd == OBD_BRW_WRITE)
1460                 cli->cl_pending_w_pages += delta;
1461         else
1462                 cli->cl_pending_r_pages += delta;
1463 }
1464
1465 static long timeval_sub(struct timeval *large, struct timeval *small)
1466 {
1467         return (large->tv_sec - small->tv_sec) * 1000000 +
1468                 (large->tv_usec - small->tv_usec);
1469 }
1470
1471 /* the loi lock is held across this function but it's allowed to release
1472  * and reacquire it during its work */
1473 static int osc_send_oap_rpc(struct client_obd *cli, struct lov_oinfo *loi,
1474                             int cmd, struct loi_oap_pages *lop)
1475 {
1476         struct ptlrpc_request *request;
1477         obd_count page_count = 0;
1478         struct list_head *tmp, *pos;
1479         struct osc_async_page *oap = NULL;
1480         struct osc_brw_async_args *aa;
1481         struct obd_async_page_ops *ops;
1482         LIST_HEAD(rpc_list);
1483         ENTRY;
1484
1485         LASSERT(lop != LP_POISON);
1486         LASSERT(lop->lop_pending.next != LP_POISON);
1487
1488         /* first we find the pages we're allowed to work with */
1489         list_for_each_safe(pos, tmp, &lop->lop_pending) {
1490                 oap = list_entry(pos, struct osc_async_page, oap_pending_item);
1491                 ops = oap->oap_caller_ops;
1492
1493                 LASSERT(oap->oap_magic == OAP_MAGIC);
1494
1495                 /* in llite being 'ready' equates to the page being locked
1496                  * until completion unlocks it.  commit_write submits a page
1497                  * as not ready because its unlock will happen unconditionally
1498                  * as the call returns.  if we race with commit_write giving
1499                  * us that page we dont' want to create a hole in the page
1500                  * stream, so we stop and leave the rpc to be fired by
1501                  * another dirtier or kupdated interval (the not ready page
1502                  * will still be on the dirty list).  we could call in
1503                  * at the end of ll_file_write to process the queue again. */
1504                 if (!(oap->oap_async_flags & ASYNC_READY)) {
1505                         int rc = ops->ap_make_ready(oap->oap_caller_data, cmd);
1506                         if (rc < 0)
1507                                 CDEBUG(D_INODE, "oap %p page %p returned %d "
1508                                                 "instead of ready\n", oap,
1509                                                 oap->oap_page, rc);
1510                         switch (rc) {
1511                         case -EAGAIN:
1512                                 /* llite is telling us that the page is still
1513                                  * in commit_write and that we should try
1514                                  * and put it in an rpc again later.  we
1515                                  * break out of the loop so we don't create
1516                                  * a hole in the sequence of pages in the rpc
1517                                  * stream.*/
1518                                 pos = NULL;
1519                                 break;
1520                         case -EINTR:
1521                                 /* the io isn't needed.. tell the checks
1522                                  * below to complete the rpc with EINTR */
1523                                 oap->oap_async_flags |= ASYNC_COUNT_STABLE;
1524                                 oap->oap_count = -EINTR;
1525                                 break;
1526                         case 0:
1527                                 oap->oap_async_flags |= ASYNC_READY;
1528                                 break;
1529                         default:
1530                                 LASSERTF(0, "oap %p page %p returned %d "
1531                                             "from make_ready\n", oap,
1532                                             oap->oap_page, rc);
1533                                 break;
1534                         }
1535                 }
1536                 if (pos == NULL)
1537                         break;
1538                 /*
1539                  * Page submitted for IO has to be locked. Either by
1540                  * ->ap_make_ready() or by higher layers.
1541                  *
1542                  * XXX nikita: this assertion should be adjusted when lustre
1543                  * starts using PG_writeback for pages being written out.
1544                  */
1545                 LASSERT(PageLocked(oap->oap_page));
1546
1547                 /* take the page out of our book-keeping */
1548                 list_del_init(&oap->oap_pending_item);
1549                 lop_update_pending(cli, lop, cmd, -1);
1550                 list_del_init(&oap->oap_urgent_item);
1551
1552                 /* ask the caller for the size of the io as the rpc leaves. */
1553                 if (!(oap->oap_async_flags & ASYNC_COUNT_STABLE))
1554                         oap->oap_count =
1555                                 ops->ap_refresh_count(oap->oap_caller_data,cmd);
1556                 if (oap->oap_count <= 0) {
1557                         CDEBUG(D_CACHE, "oap %p count %d, completing\n", oap,
1558                                oap->oap_count);
1559                         osc_ap_completion(cli, NULL, oap, 0, oap->oap_count);
1560                         continue;
1561                 }
1562
1563                 /* now put the page back in our accounting */
1564                 list_add_tail(&oap->oap_rpc_item, &rpc_list);
1565                 if (++page_count >= cli->cl_max_pages_per_rpc)
1566                         break;
1567         }
1568
1569         osc_wake_cache_waiters(cli);
1570
1571         if (page_count == 0)
1572                 RETURN(0);
1573
1574         loi_list_maint(cli, loi);
1575         spin_unlock(&cli->cl_loi_list_lock);
1576
1577         request = osc_build_req(cli, &rpc_list, page_count, cmd);
1578         if (IS_ERR(request)) {
1579                 /* this should happen rarely and is pretty bad, it makes the
1580                  * pending list not follow the dirty order */
1581                 spin_lock(&cli->cl_loi_list_lock);
1582                 list_for_each_safe(pos, tmp, &rpc_list) {
1583                         oap = list_entry(pos, struct osc_async_page,
1584                                          oap_rpc_item);
1585                         list_del_init(&oap->oap_rpc_item);
1586
1587                         /* queued sync pages can be torn down while the pages
1588                          * were between the pending list and the rpc */
1589                         if (oap->oap_interrupted) {
1590                                 CDEBUG(D_INODE, "oap %p interrupted\n", oap);
1591                                 osc_ap_completion(cli, NULL, oap, 0,
1592                                                   oap->oap_count);
1593                                 continue;
1594                         }
1595
1596                         /* put the page back in the loi/lop lists */
1597                         list_add_tail(&oap->oap_pending_item,
1598                                       &lop->lop_pending);
1599                         lop_update_pending(cli, lop, cmd, 1);
1600                         if (oap->oap_async_flags & ASYNC_URGENT)
1601                                 list_add(&oap->oap_urgent_item,
1602                                          &lop->lop_urgent);
1603                 }
1604                 loi_list_maint(cli, loi);
1605                 RETURN(PTR_ERR(request));
1606         }
1607
1608         LASSERT(sizeof(*aa) <= sizeof(request->rq_async_args));
1609         aa = (struct osc_brw_async_args *)&request->rq_async_args;
1610         INIT_LIST_HEAD(&aa->aa_oaps);
1611         list_splice(&rpc_list, &aa->aa_oaps);
1612         INIT_LIST_HEAD(&rpc_list);
1613
1614 #ifdef __KERNEL__
1615         if (cmd == OBD_BRW_READ) {
1616                 lprocfs_oh_tally_log2(&cli->cl_read_page_hist, page_count);
1617                 lprocfs_oh_tally(&cli->cl_read_rpc_hist, cli->cl_r_in_flight);
1618         } else {
1619                 lprocfs_oh_tally_log2(&cli->cl_write_page_hist, page_count);
1620                 lprocfs_oh_tally(&cli->cl_write_rpc_hist,
1621                                  cli->cl_w_in_flight);
1622         }
1623 #endif
1624
1625         spin_lock(&cli->cl_loi_list_lock);
1626
1627         /* collect write gaps and sum of them */
1628         if (cmd == OBD_BRW_WRITE && cli->cl_w_in_flight == 0) {
1629                 struct timeval now;
1630                 long diff;
1631
1632                 do_gettimeofday(&now);
1633
1634                 if (cli->cl_last_write_time.tv_sec) {
1635                         diff = timeval_sub(&now, &cli->cl_last_write_time);
1636                         if (diff < CLI_ODD_WRITE_GAP) {
1637                                 cli->cl_write_gap_sum += diff;
1638                                 cli->cl_write_gaps++;
1639                         }
1640                 }
1641         }
1642
1643         if (cmd == OBD_BRW_READ) {
1644                 cli->cl_r_in_flight++;
1645                 cli->cl_read_num++;
1646         } else {
1647                 cli->cl_w_in_flight++;
1648                 cli->cl_write_num++;
1649         }
1650
1651         /* queued sync pages can be torn down while the pages
1652          * were between the pending list and the rpc */
1653         list_for_each(pos, &aa->aa_oaps) {
1654                 oap = list_entry(pos, struct osc_async_page, oap_rpc_item);
1655                 if (oap->oap_interrupted) {
1656                         CDEBUG(D_INODE, "oap %p in req %p interrupted\n",
1657                                oap, request);
1658                         ptlrpc_mark_interrupted(request);
1659                         break;
1660                 }
1661         }
1662
1663         CDEBUG(D_INODE, "req %p: %d pages, aa %p.  now %dr/%dw in flight\n",
1664                         request, page_count, aa, cli->cl_r_in_flight,
1665                         cli->cl_w_in_flight);
1666
1667         oap->oap_request = ptlrpc_request_addref(request);
1668         request->rq_interpret_reply = brw_interpret_oap;
1669
1670         ptlrpcd_add_req(request);
1671         RETURN(1);
1672 }
1673
1674 static int lop_makes_rpc(struct client_obd *cli, struct loi_oap_pages *lop,
1675                          int cmd)
1676 {
1677         int optimal;
1678         ENTRY;
1679
1680         if (lop->lop_num_pending == 0)
1681                 RETURN(0);
1682
1683         /* if we have an invalid import we want to drain the queued pages
1684          * by forcing them through rpcs that immediately fail and complete
1685          * the pages.  recovery relies on this to empty the queued pages
1686          * before canceling the locks and evicting down the llite pages */
1687         if (cli->cl_import == NULL || cli->cl_import->imp_invalid)
1688                 RETURN(1);
1689
1690         /* stream rpcs in queue order as long as as there is an urgent page
1691          * queued.  this is our cheap solution for good batching in the case
1692          * where writepage marks some random page in the middle of the file as
1693          * urgent because of, say, memory pressure */
1694         if (!list_empty(&lop->lop_urgent))
1695                 RETURN(1);
1696
1697         /* fire off rpcs when we have 'optimal' rpcs as tuned for the wire. */
1698         optimal = cli->cl_max_pages_per_rpc;
1699         if (cmd == OBD_BRW_WRITE) {
1700                 /* trigger a write rpc stream as long as there are dirtiers
1701                  * waiting for space.  as they're waiting, they're not going to
1702                  * create more pages to coallesce with what's waiting.. */
1703                 if (!list_empty(&cli->cl_cache_waiters))
1704                         RETURN(1);
1705
1706                 /* *2 to avoid triggering rpcs that would want to include pages
1707                  * that are being queued but which can't be made ready until
1708                  * the queuer finishes with the page. this is a wart for
1709                  * llite::commit_write() */
1710                 optimal += 16;
1711         }
1712         if (lop->lop_num_pending >= optimal)
1713                 RETURN(1);
1714
1715         RETURN(0);
1716 }
1717
1718 static void on_list(struct list_head *item, struct list_head *list,
1719                     int should_be_on)
1720 {
1721         if (list_empty(item) && should_be_on)
1722                 list_add_tail(item, list);
1723         else if (!list_empty(item) && !should_be_on)
1724                 list_del_init(item);
1725 }
1726
1727 /* maintain the loi's cli list membership invariants so that osc_send_oap_rpc
1728  * can find pages to build into rpcs quickly */
1729 static void loi_list_maint(struct client_obd *cli, struct lov_oinfo *loi)
1730 {
1731         on_list(&loi->loi_cli_item, &cli->cl_loi_ready_list,
1732                 lop_makes_rpc(cli, &loi->loi_write_lop, OBD_BRW_WRITE) ||
1733                 lop_makes_rpc(cli, &loi->loi_read_lop, OBD_BRW_READ));
1734
1735         on_list(&loi->loi_write_item, &cli->cl_loi_write_list,
1736                 loi->loi_write_lop.lop_num_pending);
1737
1738         on_list(&loi->loi_read_item, &cli->cl_loi_read_list,
1739                 loi->loi_read_lop.lop_num_pending);
1740 }
1741
1742 #define LOI_DEBUG(LOI, STR, args...)                                     \
1743         CDEBUG(D_INODE, "loi ready %d wr %d:%d rd %d:%d " STR,           \
1744                !list_empty(&(LOI)->loi_cli_item),                        \
1745                (LOI)->loi_write_lop.lop_num_pending,                     \
1746                !list_empty(&(LOI)->loi_write_lop.lop_urgent),            \
1747                (LOI)->loi_read_lop.lop_num_pending,                      \
1748                !list_empty(&(LOI)->loi_read_lop.lop_urgent),             \
1749                args)                                                     \
1750
1751 struct lov_oinfo *osc_next_loi(struct client_obd *cli)
1752 {
1753         ENTRY;
1754         /* first return all objects which we already know to have
1755          * pages ready to be stuffed into rpcs */
1756         if (!list_empty(&cli->cl_loi_ready_list))
1757                 RETURN(list_entry(cli->cl_loi_ready_list.next,
1758                                   struct lov_oinfo, loi_cli_item));
1759
1760         /* then if we have cache waiters, return all objects with queued
1761          * writes.  This is especially important when many small files
1762          * have filled up the cache and not been fired into rpcs because
1763          * they don't pass the nr_pending/object threshhold */
1764         if (!list_empty(&cli->cl_cache_waiters) &&
1765             !list_empty(&cli->cl_loi_write_list))
1766                 RETURN(list_entry(cli->cl_loi_write_list.next,
1767                                   struct lov_oinfo, loi_write_item));
1768
1769         /* then return all queued objects when we have an invalid import
1770          * so that they get flushed */
1771         if (cli->cl_import == NULL || cli->cl_import->imp_invalid) {
1772                 if (!list_empty(&cli->cl_loi_write_list))
1773                         RETURN(list_entry(cli->cl_loi_write_list.next,
1774                                           struct lov_oinfo, loi_write_item));
1775                 if (!list_empty(&cli->cl_loi_read_list))
1776                         RETURN(list_entry(cli->cl_loi_read_list.next,
1777                                           struct lov_oinfo, loi_read_item));
1778         }
1779         RETURN(NULL);
1780 }
1781
1782 /* called with the loi list lock held */
1783 static void osc_check_rpcs(struct client_obd *cli)
1784 {
1785         struct lov_oinfo *loi;
1786         int rc = 0, race_counter = 0;
1787         ENTRY;
1788
1789         while ((loi = osc_next_loi(cli)) != NULL) {
1790                 LOI_DEBUG(loi, "%lu in flight\n", rpcs_in_flight(cli));
1791                 LASSERT(loi->loi_ost_idx != LL_POISON);
1792
1793                 if (rpcs_in_flight(cli) >= cli->cl_max_rpcs_in_flight)
1794                         break;
1795
1796                 /* attempt some read/write balancing by alternating between
1797                  * reads and writes in an object.  The makes_rpc checks here
1798                  * would be redundant if we were getting read/write work items
1799                  * instead of objects.  we don't want send_oap_rpc to drain a
1800                  * partial read pending queue when we're given this object to
1801                  * do io on writes while there are cache waiters */
1802                 if (lop_makes_rpc(cli, &loi->loi_write_lop, OBD_BRW_WRITE)) {
1803                         rc = osc_send_oap_rpc(cli, loi, OBD_BRW_WRITE,
1804                                               &loi->loi_write_lop);
1805                         if (rc < 0)
1806                                 break;
1807                         if (rc > 0)
1808                                 race_counter = 0;
1809                         else
1810                                 race_counter++;
1811                 }
1812                 if (lop_makes_rpc(cli, &loi->loi_read_lop, OBD_BRW_READ)) {
1813                         rc = osc_send_oap_rpc(cli, loi, OBD_BRW_READ,
1814                                               &loi->loi_read_lop);
1815                         if (rc < 0)
1816                                 break;
1817                         if (rc > 0)
1818                                 race_counter = 0;
1819                         else
1820                                 race_counter++;
1821                 }
1822
1823                 /* attempt some inter-object balancing by issueing rpcs
1824                  * for each object in turn */
1825                 if (!list_empty(&loi->loi_cli_item))
1826                         list_del_init(&loi->loi_cli_item);
1827                 if (!list_empty(&loi->loi_write_item))
1828                         list_del_init(&loi->loi_write_item);
1829                 if (!list_empty(&loi->loi_read_item))
1830                         list_del_init(&loi->loi_read_item);
1831
1832                 loi_list_maint(cli, loi);
1833
1834                 /* send_oap_rpc fails with 0 when make_ready tells it to
1835                  * back off.  llite's make_ready does this when it tries
1836                  * to lock a page queued for write that is already locked.
1837                  * we want to try sending rpcs from many objects, but we
1838                  * don't want to spin failing with 0.  */
1839                 if (race_counter == 10)
1840                         break;
1841         }
1842         EXIT;
1843 }
1844
1845 /* we're trying to queue a page in the osc so we're subject to the
1846  * 'cl_dirty_max' limit on the number of pages that can be queued in the osc.
1847  * If the osc's queued pages are already at that limit, then we want to sleep
1848  * until there is space in the osc's queue for us.  We also may be waiting for
1849  * write credits from the OST if there are RPCs in flight that may return some
1850  * before we fall back to sync writes.
1851  *
1852  * We need this know our allocation was granted in the presence of signals */
1853 static int ocw_granted(struct client_obd *cli, struct osc_cache_waiter *ocw)
1854 {
1855         int rc;
1856         ENTRY;
1857         spin_lock(&cli->cl_loi_list_lock);
1858         rc = list_empty(&ocw->ocw_entry) || rpcs_in_flight(cli) == 0;
1859         spin_unlock(&cli->cl_loi_list_lock);
1860         RETURN(rc);
1861 };
1862
1863 /* Caller must hold loi_list_lock - we drop/regain it if we need to wait for
1864  * grant or cache space. */
1865 static int osc_enter_cache(struct client_obd *cli, struct lov_oinfo *loi,
1866                            struct osc_async_page *oap)
1867 {
1868         struct osc_cache_waiter ocw;
1869         struct l_wait_info lwi = { 0 };
1870         struct timeval start, stop;
1871         ENTRY;
1872
1873         CDEBUG(D_CACHE, "dirty: %ld dirty_max: %ld dropped: %lu grant: %lu\n",
1874                cli->cl_dirty, cli->cl_dirty_max, cli->cl_lost_grant,
1875                cli->cl_avail_grant);
1876
1877         if (cli->cl_dirty_max < PAGE_SIZE)
1878                 GOTO(out, -EDQUOT);
1879
1880         if (~0ul - cli->cl_dirty_sum <= cli->cl_dirty) {
1881                 cli->cl_dirty_av = (cli->cl_dirty_av +
1882                                     (cli->cl_dirty_sum / cli->cl_dirty_num)) / 2;
1883                 cli->cl_dirty_num = 0;
1884                 cli->cl_dirty_sum = 0;
1885         } else {
1886                 if (cli->cl_dirty_num)
1887                         cli->cl_dirty_av = (cli->cl_dirty_sum / cli->cl_dirty_num);
1888         }
1889
1890         cli->cl_dirty_num++;
1891         cli->cl_dirty_sum += cli->cl_dirty;
1892
1893         if (cli->cl_dirty > cli->cl_dirty_dmax)
1894                 cli->cl_dirty_dmax = cli->cl_dirty;
1895         if (cli->cl_dirty < cli->cl_dirty_dmin || !cli->cl_dirty_dmin)
1896                 cli->cl_dirty_dmin = cli->cl_dirty;
1897
1898         /* Hopefully normal case - cache space and write credits available */
1899         if (cli->cl_dirty + PAGE_SIZE <= cli->cl_dirty_max &&
1900             cli->cl_avail_grant >= PAGE_SIZE) {
1901                 /* account for ourselves */
1902                 osc_consume_write_grant(cli, oap);
1903                 RETURN(0);
1904         }
1905
1906         /* Make sure that there are write rpcs in flight to wait for.  This
1907          * is a little silly as this object may not have any pending but
1908          * other objects sure might. */
1909         if (cli->cl_w_in_flight) {
1910                 list_add_tail(&ocw.ocw_entry, &cli->cl_cache_waiters);
1911                 init_waitqueue_head(&ocw.ocw_waitq);
1912                 ocw.ocw_oap = oap;
1913                 ocw.ocw_rc = 0;
1914
1915                 loi_list_maint(cli, loi);
1916                 osc_check_rpcs(cli);
1917                 spin_unlock(&cli->cl_loi_list_lock);
1918
1919                 CDEBUG(0, "sleeping for cache space\n");
1920                 do_gettimeofday(&start);
1921                 l_wait_event(ocw.ocw_waitq, ocw_granted(cli, &ocw), &lwi);
1922                 do_gettimeofday(&stop);
1923
1924                 cli->cl_cache_wait_num++;
1925                 cli->cl_cache_wait_sum += timeval_sub(&stop, &start);
1926
1927                 spin_lock(&cli->cl_loi_list_lock);
1928                 lprocfs_stime_record(&cli->cl_enter_stime, &stop, &start);
1929                 if (!list_empty(&ocw.ocw_entry)) {
1930                         list_del(&ocw.ocw_entry);
1931                         RETURN(-EINTR);
1932                 }
1933                 RETURN(ocw.ocw_rc);
1934         }
1935
1936         EXIT;
1937 out:
1938         cli->cl_sync_rpcs++;
1939         return -EDQUOT;
1940 }
1941
1942 /* the companion to enter_cache, called when an oap is no longer part of the
1943  * dirty accounting.. so writeback completes or truncate happens before writing
1944  * starts.  must be called with the loi lock held. */
1945 static void osc_exit_cache(struct client_obd *cli, struct osc_async_page *oap,
1946                            int sent)
1947 {
1948         ENTRY;
1949
1950         if (!(oap->oap_brw_flags & OBD_BRW_FROM_GRANT)) {
1951                 EXIT;
1952                 return;
1953         }
1954
1955         if (~0ul - cli->cl_dirty_sum <= cli->cl_dirty) {
1956                 cli->cl_dirty_av = (cli->cl_dirty_av +
1957                                     (cli->cl_dirty_sum / cli->cl_dirty_num)) / 2;
1958                 cli->cl_dirty_num = 0;
1959                 cli->cl_dirty_sum = 0;
1960         } else {
1961                 if (cli->cl_dirty_num)
1962                         cli->cl_dirty_av = (cli->cl_dirty_sum / cli->cl_dirty_num);
1963         }
1964
1965         cli->cl_dirty_num++;
1966         cli->cl_dirty_sum += cli->cl_dirty;
1967
1968         if (cli->cl_dirty > cli->cl_dirty_dmax)
1969                 cli->cl_dirty_dmax = cli->cl_dirty;
1970         if (cli->cl_dirty < cli->cl_dirty_dmin || !cli->cl_dirty_dmin)
1971                 cli->cl_dirty_dmin = cli->cl_dirty;
1972
1973         oap->oap_brw_flags &= ~OBD_BRW_FROM_GRANT;
1974         cli->cl_dirty -= PAGE_SIZE;
1975         if (!sent) {
1976                 cli->cl_lost_grant += PAGE_SIZE;
1977                 CDEBUG(D_CACHE, "lost grant: %lu avail grant: %lu dirty: %lu\n",
1978                        cli->cl_lost_grant, cli->cl_avail_grant, cli->cl_dirty);
1979         }
1980
1981         EXIT;
1982 }
1983
1984 int osc_prep_async_page(struct obd_export *exp, struct lov_stripe_md *lsm,
1985                         struct lov_oinfo *loi, struct page *page,
1986                         obd_off offset, struct obd_async_page_ops *ops,
1987                         void *data, void **res)
1988 {
1989         struct osc_async_page *oap;
1990         ENTRY;
1991
1992         OBD_ALLOC(oap, sizeof(*oap));
1993         if (oap == NULL)
1994                 return -ENOMEM;
1995
1996         oap->oap_magic = OAP_MAGIC;
1997         oap->oap_cli = &exp->exp_obd->u.cli;
1998         oap->oap_loi = loi;
1999
2000         oap->oap_caller_ops = ops;
2001         oap->oap_caller_data = data;
2002
2003         oap->oap_page = page;
2004         oap->oap_obj_off = offset;
2005
2006         INIT_LIST_HEAD(&oap->oap_pending_item);
2007         INIT_LIST_HEAD(&oap->oap_urgent_item);
2008         INIT_LIST_HEAD(&oap->oap_rpc_item);
2009
2010         oap->oap_occ.occ_interrupted = osc_occ_interrupted;
2011
2012         CDEBUG(D_CACHE, "oap %p page %p obj off "LPU64"\n", oap, page, offset);
2013         *res = oap;
2014         RETURN(0);
2015 }
2016
2017 static int osc_queue_async_io(struct obd_export *exp, struct lov_stripe_md *lsm,
2018                               struct lov_oinfo *loi, void *cookie,
2019                               int cmd, obd_off off, int count,
2020                               obd_flags brw_flags, enum async_flags async_flags)
2021 {
2022         struct client_obd *cli = &exp->exp_obd->u.cli;
2023         struct osc_async_page *oap;
2024         struct loi_oap_pages *lop;
2025         int rc;
2026         ENTRY;
2027
2028         oap = OAP_FROM_COOKIE(cookie);
2029
2030         if (cli->cl_import == NULL || cli->cl_import->imp_invalid)
2031                 RETURN(-EIO);
2032
2033         if (!list_empty(&oap->oap_pending_item) ||
2034             !list_empty(&oap->oap_urgent_item) ||
2035             !list_empty(&oap->oap_rpc_item))
2036                 RETURN(-EBUSY);
2037
2038         if (loi == NULL)
2039                 loi = &lsm->lsm_oinfo[0];
2040
2041         spin_lock(&cli->cl_loi_list_lock);
2042
2043         oap->oap_cmd = cmd;
2044         oap->oap_async_flags = async_flags;
2045         oap->oap_page_off = off;
2046         oap->oap_count = count;
2047         oap->oap_brw_flags = brw_flags;
2048
2049         if (cmd == OBD_BRW_WRITE) {
2050                 rc = osc_enter_cache(cli, loi, oap);
2051                 if (rc) {
2052                         spin_unlock(&cli->cl_loi_list_lock);
2053                         RETURN(rc);
2054                 }
2055                 lop = &loi->loi_write_lop;
2056         } else {
2057                 lop = &loi->loi_read_lop;
2058         }
2059
2060         if (oap->oap_async_flags & ASYNC_URGENT)
2061                 list_add(&oap->oap_urgent_item, &lop->lop_urgent);
2062         list_add_tail(&oap->oap_pending_item, &lop->lop_pending);
2063         lop_update_pending(cli, lop, cmd, 1);
2064
2065         loi_list_maint(cli, loi);
2066
2067         LOI_DEBUG(loi, "oap %p page %p added for cmd %d\n", oap, oap->oap_page,
2068                   cmd);
2069
2070         osc_check_rpcs(cli);
2071         spin_unlock(&cli->cl_loi_list_lock);
2072
2073         RETURN(0);
2074 }
2075
2076 /* aka (~was & now & flag), but this is more clear :) */
2077 #define SETTING(was, now, flag) (!(was & flag) && (now & flag))
2078
2079 static int osc_set_async_flags(struct obd_export *exp,
2080                                struct lov_stripe_md *lsm,
2081                                struct lov_oinfo *loi, void *cookie,
2082                                obd_flags async_flags)
2083 {
2084         struct client_obd *cli = &exp->exp_obd->u.cli;
2085         struct loi_oap_pages *lop;
2086         struct osc_async_page *oap;
2087         int rc = 0;
2088         ENTRY;
2089
2090         oap = OAP_FROM_COOKIE(cookie);
2091
2092         if (cli->cl_import == NULL || cli->cl_import->imp_invalid)
2093                 RETURN(-EIO);
2094
2095         if (loi == NULL)
2096                 loi = &lsm->lsm_oinfo[0];
2097
2098         if (oap->oap_cmd == OBD_BRW_WRITE) {
2099                 lop = &loi->loi_write_lop;
2100         } else {
2101                 lop = &loi->loi_read_lop;
2102         }
2103
2104         spin_lock(&cli->cl_loi_list_lock);
2105
2106         if (list_empty(&oap->oap_pending_item))
2107                 GOTO(out, rc = -EINVAL);
2108
2109         if ((oap->oap_async_flags & async_flags) == async_flags)
2110                 GOTO(out, rc = 0);
2111
2112         if (SETTING(oap->oap_async_flags, async_flags, ASYNC_READY))
2113                 oap->oap_async_flags |= ASYNC_READY;
2114
2115         if (SETTING(oap->oap_async_flags, async_flags, ASYNC_URGENT)) {
2116                 if (list_empty(&oap->oap_rpc_item)) {
2117                         list_add(&oap->oap_urgent_item, &lop->lop_urgent);
2118                         loi_list_maint(cli, loi);
2119                 }
2120         }
2121
2122         LOI_DEBUG(loi, "oap %p page %p has flags %x\n", oap, oap->oap_page,
2123                         oap->oap_async_flags);
2124 out:
2125         osc_check_rpcs(cli);
2126         spin_unlock(&cli->cl_loi_list_lock);
2127         RETURN(rc);
2128 }
2129
2130 static int osc_queue_group_io(struct obd_export *exp, struct lov_stripe_md *lsm,
2131                              struct lov_oinfo *loi,
2132                              struct obd_io_group *oig, void *cookie,
2133                              int cmd, obd_off off, int count,
2134                              obd_flags brw_flags,
2135                              obd_flags async_flags)
2136 {
2137         struct client_obd *cli = &exp->exp_obd->u.cli;
2138         struct osc_async_page *oap;
2139         struct loi_oap_pages *lop;
2140         ENTRY;
2141
2142         oap = OAP_FROM_COOKIE(cookie);
2143
2144         if (cli->cl_import == NULL || cli->cl_import->imp_invalid)
2145                 RETURN(-EIO);
2146
2147         if (!list_empty(&oap->oap_pending_item) ||
2148             !list_empty(&oap->oap_urgent_item) ||
2149             !list_empty(&oap->oap_rpc_item))
2150                 RETURN(-EBUSY);
2151
2152         if (loi == NULL)
2153                 loi = &lsm->lsm_oinfo[0];
2154
2155         spin_lock(&cli->cl_loi_list_lock);
2156
2157         oap->oap_cmd = cmd;
2158         oap->oap_page_off = off;
2159         oap->oap_count = count;
2160         oap->oap_brw_flags = brw_flags;
2161         oap->oap_async_flags = async_flags;
2162
2163         if (cmd == OBD_BRW_WRITE)
2164                 lop = &loi->loi_write_lop;
2165         else
2166                 lop = &loi->loi_read_lop;
2167
2168         list_add_tail(&oap->oap_pending_item, &lop->lop_pending_group);
2169         if (oap->oap_async_flags & ASYNC_GROUP_SYNC) {
2170                 oap->oap_oig = oig;
2171                 oig_add_one(oig, &oap->oap_occ);
2172         }
2173
2174         LOI_DEBUG(loi, "oap %p page %p on group pending\n", oap, oap->oap_page);
2175
2176         spin_unlock(&cli->cl_loi_list_lock);
2177
2178         RETURN(0);
2179 }
2180
2181 static void osc_group_to_pending(struct client_obd *cli, struct lov_oinfo *loi,
2182                                  struct loi_oap_pages *lop, int cmd)
2183 {
2184         struct list_head *pos, *tmp;
2185         struct osc_async_page *oap;
2186
2187         list_for_each_safe(pos, tmp, &lop->lop_pending_group) {
2188                 oap = list_entry(pos, struct osc_async_page, oap_pending_item);
2189                 list_del(&oap->oap_pending_item);
2190                 list_add_tail(&oap->oap_pending_item, &lop->lop_pending);
2191                 list_add(&oap->oap_urgent_item, &lop->lop_urgent);
2192                 lop_update_pending(cli, lop, cmd, 1);
2193         }
2194         loi_list_maint(cli, loi);
2195 }
2196
2197 static int osc_trigger_group_io(struct obd_export *exp,
2198                                 struct lov_stripe_md *lsm,
2199                                 struct lov_oinfo *loi,
2200                                 struct obd_io_group *oig)
2201 {
2202         struct client_obd *cli = &exp->exp_obd->u.cli;
2203         ENTRY;
2204
2205         if (loi == NULL)
2206                 loi = &lsm->lsm_oinfo[0];
2207
2208         spin_lock(&cli->cl_loi_list_lock);
2209
2210         osc_group_to_pending(cli, loi, &loi->loi_write_lop, OBD_BRW_WRITE);
2211         osc_group_to_pending(cli, loi, &loi->loi_read_lop, OBD_BRW_READ);
2212
2213         osc_check_rpcs(cli);
2214         spin_unlock(&cli->cl_loi_list_lock);
2215
2216         RETURN(0);
2217 }
2218
2219 static int osc_teardown_async_page(struct obd_export *exp,
2220                                    struct lov_stripe_md *lsm,
2221                                    struct lov_oinfo *loi, void *cookie)
2222 {
2223         struct client_obd *cli = &exp->exp_obd->u.cli;
2224         struct loi_oap_pages *lop;
2225         struct osc_async_page *oap;
2226         int rc = 0;
2227         ENTRY;
2228
2229         oap = OAP_FROM_COOKIE(cookie);
2230
2231         if (loi == NULL)
2232                 loi = &lsm->lsm_oinfo[0];
2233
2234         if (oap->oap_cmd == OBD_BRW_WRITE) {
2235                 lop = &loi->loi_write_lop;
2236         } else {
2237                 lop = &loi->loi_read_lop;
2238         }
2239
2240         spin_lock(&cli->cl_loi_list_lock);
2241
2242         if (!list_empty(&oap->oap_rpc_item))
2243                 GOTO(out, rc = -EBUSY);
2244
2245         osc_exit_cache(cli, oap, 0);
2246         osc_wake_cache_waiters(cli);
2247
2248         if (!list_empty(&oap->oap_urgent_item)) {
2249                 list_del_init(&oap->oap_urgent_item);
2250                 oap->oap_async_flags &= ~ASYNC_URGENT;
2251         }
2252         if (!list_empty(&oap->oap_pending_item)) {
2253                 list_del_init(&oap->oap_pending_item);
2254                 lop_update_pending(cli, lop, oap->oap_cmd, -1);
2255         }
2256         loi_list_maint(cli, loi);
2257
2258         LOI_DEBUG(loi, "oap %p page %p torn down\n", oap, oap->oap_page);
2259 out:
2260         spin_unlock(&cli->cl_loi_list_lock);
2261         if (rc == 0)
2262                 OBD_FREE(oap, sizeof(*oap));
2263         RETURN(rc);
2264 }
2265
2266 #ifdef __KERNEL__
2267 /* Note: caller will lock/unlock, and set uptodate on the pages */
2268 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
2269 static int sanosc_brw_read(struct obd_export *exp, struct obdo *oa,
2270                            struct lov_stripe_md *lsm, obd_count page_count,
2271                            struct brw_page *pga)
2272 {
2273         struct ptlrpc_request *request = NULL;
2274         struct ost_body *body;
2275         struct niobuf_remote *nioptr;
2276         struct obd_ioobj *iooptr;
2277         int rc, size[3] = {sizeof(*body)}, mapped = 0;
2278         int swab;
2279         ENTRY;
2280
2281         /* XXX does not handle 'new' brw protocol */
2282
2283         size[1] = sizeof(struct obd_ioobj);
2284         size[2] = page_count * sizeof(*nioptr);
2285
2286         request = ptlrpc_prep_req(class_exp2cliimp(exp), LUSTRE_OBD_VERSION,
2287                                   OST_SAN_READ, 3, size, NULL);
2288         if (!request)
2289                 RETURN(-ENOMEM);
2290
2291         body = lustre_msg_buf(request->rq_reqmsg, 0, sizeof(*body));
2292         iooptr = lustre_msg_buf(request->rq_reqmsg, 1, sizeof(*iooptr));
2293         nioptr = lustre_msg_buf(request->rq_reqmsg, 2,
2294                                 sizeof(*nioptr) * page_count);
2295
2296         memcpy(&body->oa, oa, sizeof(body->oa));
2297
2298         obdo_to_ioobj(oa, iooptr);
2299         iooptr->ioo_bufcnt = page_count;
2300
2301         for (mapped = 0; mapped < page_count; mapped++, nioptr++) {
2302                 LASSERT(PageLocked(pga[mapped].pg));
2303                 LASSERT(mapped == 0 ||
2304                         pga[mapped].disk_offset > pga[mapped - 1].disk_offset);
2305
2306                 nioptr->offset = pga[mapped].disk_offset;
2307                 nioptr->len    = pga[mapped].count;
2308                 nioptr->flags  = pga[mapped].flag;
2309         }
2310
2311         size[1] = page_count * sizeof(*nioptr);
2312         request->rq_replen = lustre_msg_size(2, size);
2313
2314         rc = ptlrpc_queue_wait(request);
2315         if (rc)
2316                 GOTO(out_req, rc);
2317
2318         body = lustre_swab_repbuf(request, 0, sizeof(*body),
2319                                   lustre_swab_ost_body);
2320         if (body == NULL) {
2321                 CERROR("Can't unpack body\n");
2322                 GOTO(out_req, rc = -EPROTO);
2323         }
2324
2325         memcpy(oa, &body->oa, sizeof(*oa));
2326
2327         swab = lustre_msg_swabbed(request->rq_repmsg);
2328         LASSERT_REPSWAB(request, 1);
2329         nioptr = lustre_msg_buf(request->rq_repmsg, 1, size[1]);
2330         if (!nioptr) {
2331                 /* nioptr missing or short */
2332                 GOTO(out_req, rc = -EPROTO);
2333         }
2334
2335         /* actual read */
2336         for (mapped = 0; mapped < page_count; mapped++, nioptr++) {
2337                 struct page *page = pga[mapped].pg;
2338                 struct buffer_head *bh;
2339                 kdev_t dev;
2340
2341                 if (swab)
2342                         lustre_swab_niobuf_remote (nioptr);
2343
2344                 /* got san device associated */
2345                 LASSERT(exp->exp_obd != NULL);
2346                 dev = exp->exp_obd->u.cli.cl_sandev;
2347
2348                 /* hole */
2349                 if (!nioptr->offset) {
2350                         CDEBUG(D_PAGE, "hole at ino %lu; index %ld\n",
2351                                         page->mapping->host->i_ino,
2352                                         page->index);
2353                         memset(page_address(page), 0, PAGE_SIZE);
2354                         continue;
2355                 }
2356
2357                 if (!page->buffers) {
2358                         create_empty_buffers(page, dev, PAGE_SIZE);
2359                         bh = page->buffers;
2360
2361                         clear_bit(BH_New, &bh->b_state);
2362                         set_bit(BH_Mapped, &bh->b_state);
2363                         bh->b_blocknr = (unsigned long)nioptr->offset;
2364
2365                         clear_bit(BH_Uptodate, &bh->b_state);
2366
2367                         ll_rw_block(READ, 1, &bh);
2368                 } else {
2369                         bh = page->buffers;
2370
2371                         /* if buffer already existed, it must be the
2372                          * one we mapped before, check it */
2373                         LASSERT(!test_bit(BH_New, &bh->b_state));
2374                         LASSERT(test_bit(BH_Mapped, &bh->b_state));
2375                         LASSERT(bh->b_blocknr == (unsigned long)nioptr->offset);
2376
2377                         /* wait it's io completion */
2378                         if (test_bit(BH_Lock, &bh->b_state))
2379                                 wait_on_buffer(bh);
2380
2381                         if (!test_bit(BH_Uptodate, &bh->b_state))
2382                                 ll_rw_block(READ, 1, &bh);
2383                 }
2384
2385
2386                 /* must do syncronous write here */
2387                 wait_on_buffer(bh);
2388                 if (!buffer_uptodate(bh)) {
2389                         /* I/O error */
2390                         rc = -EIO;
2391                         goto out_req;
2392                 }
2393         }
2394
2395 out_req:
2396         ptlrpc_req_finished(request);
2397         RETURN(rc);
2398 }
2399
2400 static int sanosc_brw_write(struct obd_export *exp, struct obdo *oa,
2401                             struct lov_stripe_md *lsm, obd_count page_count,
2402                             struct brw_page *pga)
2403 {
2404         struct ptlrpc_request *request = NULL;
2405         struct ost_body *body;
2406         struct niobuf_remote *nioptr;
2407         struct obd_ioobj *iooptr;
2408         int rc, size[3] = {sizeof(*body)}, mapped = 0;
2409         int swab;
2410         ENTRY;
2411
2412         size[1] = sizeof(struct obd_ioobj);
2413         size[2] = page_count * sizeof(*nioptr);
2414
2415         request = ptlrpc_prep_req(class_exp2cliimp(exp), LUSTRE_OBD_VERSION,
2416                                   OST_SAN_WRITE, 3, size, NULL);
2417         if (!request)
2418                 RETURN(-ENOMEM);
2419
2420         body = lustre_msg_buf(request->rq_reqmsg, 0, sizeof (*body));
2421         iooptr = lustre_msg_buf(request->rq_reqmsg, 1, sizeof (*iooptr));
2422         nioptr = lustre_msg_buf(request->rq_reqmsg, 2,
2423                                 sizeof (*nioptr) * page_count);
2424
2425         memcpy(&body->oa, oa, sizeof(body->oa));
2426
2427         obdo_to_ioobj(oa, iooptr);
2428         iooptr->ioo_bufcnt = page_count;
2429
2430         /* pack request */
2431         for (mapped = 0; mapped < page_count; mapped++, nioptr++) {
2432                 LASSERT(PageLocked(pga[mapped].pg));
2433                 LASSERT(mapped == 0 ||
2434                         pga[mapped].disk_offset > pga[mapped - 1].disk_offset);
2435
2436                 nioptr->offset = pga[mapped].disk_offset;
2437                 nioptr->len    = pga[mapped].count;
2438                 nioptr->flags  = pga[mapped].flag;
2439         }
2440
2441         size[1] = page_count * sizeof(*nioptr);
2442         request->rq_replen = lustre_msg_size(2, size);
2443
2444         rc = ptlrpc_queue_wait(request);
2445         if (rc)
2446                 GOTO(out_req, rc);
2447
2448         swab = lustre_msg_swabbed (request->rq_repmsg);
2449         LASSERT_REPSWAB (request, 1);
2450         nioptr = lustre_msg_buf(request->rq_repmsg, 1, size[1]);
2451         if (!nioptr) {
2452                 CERROR("absent/short niobuf array\n");
2453                 GOTO(out_req, rc = -EPROTO);
2454         }
2455
2456         /* actual write */
2457         for (mapped = 0; mapped < page_count; mapped++, nioptr++) {
2458                 struct page *page = pga[mapped].pg;
2459                 struct buffer_head *bh;
2460                 kdev_t dev;
2461
2462                 if (swab)
2463                         lustre_swab_niobuf_remote (nioptr);
2464
2465                 /* got san device associated */
2466                 LASSERT(exp->exp_obd != NULL);
2467                 dev = exp->exp_obd->u.cli.cl_sandev;
2468
2469                 if (!page->buffers) {
2470                         create_empty_buffers(page, dev, PAGE_SIZE);
2471                 } else {
2472                         /* checking */
2473                         LASSERT(!test_bit(BH_New, &page->buffers->b_state));
2474                         LASSERT(test_bit(BH_Mapped, &page->buffers->b_state));
2475                         LASSERT(page->buffers->b_blocknr ==
2476                                 (unsigned long)nioptr->offset);
2477                 }
2478                 bh = page->buffers;
2479
2480                 LASSERT(bh);
2481
2482                 /* if buffer locked, wait it's io completion */
2483                 if (test_bit(BH_Lock, &bh->b_state))
2484                         wait_on_buffer(bh);
2485
2486                 clear_bit(BH_New, &bh->b_state);
2487                 set_bit(BH_Mapped, &bh->b_state);
2488
2489                 /* override the block nr */
2490                 bh->b_blocknr = (unsigned long)nioptr->offset;
2491
2492                 /* we are about to write it, so set it
2493                  * uptodate/dirty
2494                  * page lock should garentee no race condition here */
2495                 set_bit(BH_Uptodate, &bh->b_state);
2496                 set_bit(BH_Dirty, &bh->b_state);
2497
2498                 ll_rw_block(WRITE, 1, &bh);
2499
2500                 /* must do syncronous write here */
2501                 wait_on_buffer(bh);
2502                 if (!buffer_uptodate(bh) || test_bit(BH_Dirty, &bh->b_state)) {
2503                         /* I/O error */
2504                         rc = -EIO;
2505                         goto out_req;
2506                 }
2507         }
2508
2509 out_req:
2510         ptlrpc_req_finished(request);
2511         RETURN(rc);
2512 }
2513
2514 static int sanosc_brw(int cmd, struct obd_export *exp, struct obdo *oa,
2515                       struct lov_stripe_md *lsm, obd_count page_count,
2516                       struct brw_page *pga, struct obd_trans_info *oti)
2517 {
2518         ENTRY;
2519
2520         while (page_count) {
2521                 obd_count pages_per_brw;
2522                 int rc;
2523
2524                 if (page_count > PTLRPC_MAX_BRW_PAGES)
2525                         pages_per_brw = PTLRPC_MAX_BRW_PAGES;
2526                 else
2527                         pages_per_brw = page_count;
2528
2529                 if (cmd & OBD_BRW_WRITE)
2530                         rc = sanosc_brw_write(exp, oa, lsm, pages_per_brw,pga);
2531                 else
2532                         rc = sanosc_brw_read(exp, oa, lsm, pages_per_brw, pga);
2533
2534                 if (rc != 0)
2535                         RETURN(rc);
2536
2537                 page_count -= pages_per_brw;
2538                 pga += pages_per_brw;
2539         }
2540         RETURN(0);
2541 }
2542 #endif
2543 #endif
2544
2545 static void osc_set_data_with_check(struct lustre_handle *lockh, void *data)
2546 {
2547         struct ldlm_lock *lock = ldlm_handle2lock(lockh);
2548
2549         if (lock == NULL) {
2550                 CERROR("lockh %p, data %p - client evicted?\n", lockh, data);
2551                 return;
2552         }
2553
2554         lock_res_and_lock(lock);
2555 #ifdef __KERNEL__
2556         if (lock->l_ast_data && lock->l_ast_data != data) {
2557                 struct inode *new_inode = data;
2558                 struct inode *old_inode = lock->l_ast_data;
2559                 if (!(old_inode->i_state & I_FREEING))
2560                         LDLM_ERROR(lock, "inconsistent l_ast_data found");
2561                 LASSERTF(old_inode->i_state & I_FREEING,
2562                          "Found existing inode %p/%lu/%u state %lu in lock: "
2563                          "setting data to %p/%lu/%u\n", old_inode,
2564                          old_inode->i_ino, old_inode->i_generation,
2565                          old_inode->i_state,
2566                          new_inode, new_inode->i_ino, new_inode->i_generation);
2567         }
2568 #endif
2569         lock->l_ast_data = data;
2570         unlock_res_and_lock(lock);
2571         LDLM_LOCK_PUT(lock);
2572 }
2573
2574 static int osc_change_cbdata(struct obd_export *exp, struct lov_stripe_md *lsm,
2575                              ldlm_iterator_t replace, void *data)
2576 {
2577         struct ldlm_res_id res_id = { .name = {0} };
2578         struct obd_device *obd = class_exp2obd(exp);
2579
2580         res_id.name[0] = lsm->lsm_object_id;
2581         res_id.name[2] = lsm->lsm_object_gr;
2582         ldlm_change_cbdata(obd->obd_namespace, &res_id, replace, data);
2583         return 0;
2584 }
2585
2586 static int osc_enqueue(struct obd_export *exp, struct lov_stripe_md *lsm,
2587                        __u32 type, ldlm_policy_data_t *policy, __u32 mode,
2588                        int *flags, void *bl_cb, void *cp_cb, void *gl_cb,
2589                        void *data, __u32 lvb_len, void *lvb_swabber,
2590                        struct lustre_handle *lockh)
2591 {
2592         struct obd_device *obd = exp->exp_obd;
2593         struct ldlm_res_id res_id = { .name = {0} };
2594         struct ost_lvb lvb;
2595         struct ldlm_reply *rep;
2596         struct ptlrpc_request *req = NULL;
2597         int rc;
2598         ENTRY;
2599
2600         res_id.name[0] = lsm->lsm_object_id;
2601         res_id.name[2] = lsm->lsm_object_gr;
2602
2603         /* Filesystem lock extents are extended to page boundaries so that
2604          * dealing with the page cache is a little smoother.  */
2605         policy->l_extent.start -= policy->l_extent.start & ~PAGE_MASK;
2606         policy->l_extent.end |= ~PAGE_MASK;
2607
2608         if (lsm->lsm_oinfo->loi_kms_valid == 0)
2609                 goto no_match;
2610
2611         /* Next, search for already existing extent locks that will cover us */
2612         rc = ldlm_lock_match(obd->obd_namespace, 0, &res_id, type, policy, mode,
2613                              lockh);
2614         if (rc == 1) {
2615                 if (ptlrpcs_check_cred(obd->u.cli.cl_import)) {
2616                         /* return immediately if no credential held */
2617                         ldlm_lock_decref(lockh, mode);
2618                         RETURN(-EACCES);
2619                 }
2620
2621                 osc_set_data_with_check(lockh, data);
2622                 if (*flags & LDLM_FL_HAS_INTENT) {
2623                         /* I would like to be able to ASSERT here that rss <=
2624                          * kms, but I can't, for reasons which are explained in
2625                          * lov_enqueue() */
2626                 }
2627                 /* We already have a lock, and it's referenced */
2628                 RETURN(ELDLM_OK);
2629         }
2630
2631         /* If we're trying to read, we also search for an existing PW lock.  The
2632          * VFS and page cache already protect us locally, so lots of readers/
2633          * writers can share a single PW lock.
2634          *
2635          * There are problems with conversion deadlocks, so instead of
2636          * converting a read lock to a write lock, we'll just enqueue a new
2637          * one.
2638          *
2639          * At some point we should cancel the read lock instead of making them
2640          * send us a blocking callback, but there are problems with canceling
2641          * locks out from other users right now, too. */
2642
2643         if (mode == LCK_PR) {
2644                 rc = ldlm_lock_match(obd->obd_namespace, 0, &res_id, type,
2645                                      policy, LCK_PW, lockh);
2646                 if (rc == 1) {
2647                         if (ptlrpcs_check_cred(obd->u.cli.cl_import)) {
2648                                 /* return immediately if no credential held */
2649                                 ldlm_lock_decref(lockh, LCK_PW);
2650                                 RETURN(-EACCES);
2651                         }
2652
2653                         /* FIXME: This is not incredibly elegant, but it might
2654                          * be more elegant than adding another parameter to
2655                          * lock_match.  I want a second opinion. */
2656                         ldlm_lock_addref(lockh, LCK_PR);
2657                         ldlm_lock_decref(lockh, LCK_PW);
2658                         osc_set_data_with_check(lockh, data);
2659                         RETURN(ELDLM_OK);
2660                 }
2661         }
2662         if (mode == LCK_PW) {
2663                 rc = ldlm_lock_match(obd->obd_namespace, 0, &res_id, type,
2664                                      policy, LCK_PR, lockh);
2665                 if (rc == 1) {
2666                         rc = ldlm_cli_convert(lockh, mode, flags);
2667                         if (!rc) {
2668                                 /* Update readers/writers accounting */
2669                                 ldlm_lock_addref(lockh, LCK_PW);
2670                                 ldlm_lock_decref(lockh, LCK_PR);
2671                                 osc_set_data_with_check(lockh, data);
2672                                 RETURN(ELDLM_OK);
2673                         }
2674                         /* If the conversion failed, we need to drop refcount
2675                            on matched lock before we get new one */
2676                         /* XXX Won't it save us some efforts if we cancel PR
2677                            lock here? We are going to take PW lock anyway and it
2678                            will invalidate PR lock */
2679                         ldlm_lock_decref(lockh, LCK_PR);
2680                         if (rc != EDEADLOCK) {
2681                                 RETURN(rc);
2682                         }
2683                 }
2684         }
2685
2686 no_match:
2687         if (*flags & LDLM_FL_HAS_INTENT) {
2688                 int size[2] = {0, sizeof(struct ldlm_request)};
2689
2690                 req = ptlrpc_prep_req(class_exp2cliimp(exp), LUSTRE_DLM_VERSION,
2691                                       LDLM_ENQUEUE, 2, size, NULL);
2692                 if (req == NULL)
2693                         RETURN(-ENOMEM);
2694
2695                 size[0] = sizeof(*rep);
2696                 size[1] = sizeof(lvb);
2697                 req->rq_replen = lustre_msg_size(2, size);
2698         }
2699         rc = ldlm_cli_enqueue(exp, req, obd->obd_namespace, res_id, type,
2700                               policy, mode, flags, bl_cb, cp_cb, gl_cb, data,
2701                               &lvb, sizeof(lvb), lustre_swab_ost_lvb, lockh);
2702         if (req != NULL) {
2703                 if (rc == ELDLM_LOCK_ABORTED) {
2704                         /* swabbed by ldlm_cli_enqueue() */
2705                         LASSERT_REPSWABBED(req, 0);
2706                         rep = lustre_msg_buf(req->rq_repmsg, 0, sizeof(*rep));
2707                         LASSERT(rep != NULL);
2708                         if (rep->lock_policy_res1)
2709                                 rc = rep->lock_policy_res1;
2710                 }
2711                 ptlrpc_req_finished(req);
2712         }
2713
2714         if ((*flags & LDLM_FL_HAS_INTENT && rc == ELDLM_LOCK_ABORTED) || !rc) {
2715                 CDEBUG(D_INODE, "received kms == "LPU64", blocks == "LPU64"\n",
2716                        lvb.lvb_size, lvb.lvb_blocks);
2717                 lsm->lsm_oinfo->loi_rss = lvb.lvb_size;
2718                 lsm->lsm_oinfo->loi_blocks = lvb.lvb_blocks;
2719         }
2720
2721         RETURN(rc);
2722 }
2723
2724 static int osc_match(struct obd_export *exp, struct lov_stripe_md *lsm,
2725                      __u32 type, ldlm_policy_data_t *policy, __u32 mode,
2726                      int *flags, void *data, struct lustre_handle *lockh)
2727 {
2728         struct ldlm_res_id res_id = { .name = {0} };
2729         struct obd_device *obd = exp->exp_obd;
2730         int rc;
2731         ENTRY;
2732
2733         res_id.name[0] = lsm->lsm_object_id;
2734         res_id.name[2] = lsm->lsm_object_gr;
2735
2736         OBD_FAIL_RETURN(OBD_FAIL_OSC_MATCH, -EIO);
2737
2738         /* Filesystem lock extents are extended to page boundaries so that
2739          * dealing with the page cache is a little smoother */
2740         policy->l_extent.start -= policy->l_extent.start & ~PAGE_MASK;
2741         policy->l_extent.end |= ~PAGE_MASK;
2742
2743         /* Next, search for already existing extent locks that will cover us */
2744         rc = ldlm_lock_match(obd->obd_namespace, *flags, &res_id, type,
2745                              policy, mode, lockh);
2746         if (rc) {
2747                // if (!(*flags & LDLM_FL_TEST_LOCK))
2748                         osc_set_data_with_check(lockh, data);
2749                 RETURN(rc);
2750         }
2751         /* If we're trying to read, we also search for an existing PW lock.  The
2752          * VFS and page cache already protect us locally, so lots of readers/
2753          * writers can share a single PW lock. */
2754         if (mode == LCK_PR) {
2755                 rc = ldlm_lock_match(obd->obd_namespace, *flags, &res_id, type,
2756                                      policy, LCK_PW, lockh);
2757                 if (rc == 1 && !(*flags & LDLM_FL_TEST_LOCK)) {
2758                         /* FIXME: This is not incredibly elegant, but it might
2759                          * be more elegant than adding another parameter to
2760                          * lock_match.  I want a second opinion. */
2761                         osc_set_data_with_check(lockh, data);
2762                         ldlm_lock_addref(lockh, LCK_PR);
2763                         ldlm_lock_decref(lockh, LCK_PW);
2764                 }
2765         }
2766         RETURN(rc);
2767 }
2768
2769 static int osc_cancel(struct obd_export *exp, struct lov_stripe_md *md,
2770                       __u32 mode, struct lustre_handle *lockh)
2771 {
2772         ENTRY;
2773
2774         if (mode == LCK_GROUP)
2775                 ldlm_lock_decref_and_cancel(lockh, mode);
2776         else
2777                 ldlm_lock_decref(lockh, mode);
2778
2779         RETURN(0);
2780 }
2781
2782 static int osc_cancel_unused(struct obd_export *exp,
2783                              struct lov_stripe_md *lsm,
2784                              int flags, void *opaque)
2785 {
2786         struct obd_device *obd = class_exp2obd(exp);
2787         struct ldlm_res_id res_id = { .name = {0} }, *resp = NULL;
2788
2789         if (lsm != NULL) {
2790                 res_id.name[0] = lsm->lsm_object_id;
2791                 res_id.name[2] = lsm->lsm_object_gr;
2792                 resp = &res_id;
2793         }
2794
2795         return ldlm_cli_cancel_unused(obd->obd_namespace, resp, flags, opaque);
2796 }
2797
2798 static int osc_statfs(struct obd_device *obd, struct obd_statfs *osfs,
2799                       unsigned long max_age)
2800 {
2801         struct obd_statfs *msfs;
2802         struct ptlrpc_request *request;
2803         int rc, size = sizeof(*osfs);
2804         ENTRY;
2805
2806         /* We could possibly pass max_age in the request (as an absolute
2807          * timestamp or a "seconds.usec ago") so the target can avoid doing
2808          * extra calls into the filesystem if that isn't necessary (e.g.
2809          * during mount that would help a bit).  Having relative timestamps
2810          * is not so great if request processing is slow, while absolute
2811          * timestamps are not ideal because they need time synchronization. */
2812         request = ptlrpc_prep_req(obd->u.cli.cl_import, LUSTRE_OBD_VERSION,
2813                                   OST_STATFS, 0, NULL, NULL);
2814         if (!request)
2815                 RETURN(-ENOMEM);
2816
2817         request->rq_replen = lustre_msg_size(1, &size);
2818         request->rq_request_portal = OST_CREATE_PORTAL; //XXX FIXME bug 249
2819
2820         rc = ptlrpc_queue_wait(request);
2821         if (rc)
2822                 GOTO(out, rc);
2823
2824         msfs = lustre_swab_repbuf(request, 0, sizeof(*msfs),
2825                                   lustre_swab_obd_statfs);
2826         if (msfs == NULL) {
2827                 CERROR("Can't unpack obd_statfs\n");
2828                 GOTO(out, rc = -EPROTO);
2829         }
2830
2831         memcpy(osfs, msfs, sizeof(*osfs));
2832
2833         EXIT;
2834  out:
2835         ptlrpc_req_finished(request);
2836         return rc;
2837 }
2838
2839 /* Retrieve object striping information.
2840  *
2841  * @lmmu is a pointer to an in-core struct with lmm_ost_count indicating
2842  * the maximum number of OST indices which will fit in the user buffer.
2843  * lmm_magic must be LOV_MAGIC (we only use 1 slot here).
2844  */
2845 static int osc_getstripe(struct lov_stripe_md *lsm, struct lov_user_md *lump)
2846 {
2847         struct lov_user_md lum, *lumk;
2848         int rc, lum_size;
2849         ENTRY;
2850
2851         if (!lsm)
2852                 RETURN(-ENODATA);
2853
2854         rc = copy_from_user(&lum, lump, sizeof(lum));
2855         if (rc)
2856                 RETURN(-EFAULT);
2857
2858         if (lum.lmm_magic != LOV_USER_MAGIC)
2859                 RETURN(-EINVAL);
2860
2861         if (lum.lmm_stripe_count > 0) {
2862                 lum_size = sizeof(lum) + sizeof(lum.lmm_objects[0]);
2863                 OBD_ALLOC(lumk, lum_size);
2864                 if (!lumk)
2865                         RETURN(-ENOMEM);
2866
2867                 lumk->lmm_objects[0].l_object_id = lsm->lsm_object_id;
2868                 lumk->lmm_objects[0].l_object_gr = lsm->lsm_object_gr;
2869         } else {
2870                 lum_size = sizeof(lum);
2871                 lumk = &lum;
2872         }
2873
2874         lumk->lmm_object_id = lsm->lsm_object_id;
2875         lumk->lmm_object_gr = lsm->lsm_object_gr;
2876         lumk->lmm_stripe_count = 1;
2877
2878         if (copy_to_user(lump, lumk, lum_size))
2879                 rc = -EFAULT;
2880
2881         if (lumk != &lum)
2882                 OBD_FREE(lumk, lum_size);
2883
2884         RETURN(rc);
2885 }
2886
2887 static int osc_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
2888                          void *karg, void *uarg)
2889 {
2890         struct obd_device *obd = exp->exp_obd;
2891         struct obd_ioctl_data *data = karg;
2892         int err = 0;
2893         ENTRY;
2894
2895 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
2896         MOD_INC_USE_COUNT;
2897 #else
2898         if (!try_module_get(THIS_MODULE)) {
2899                 CERROR("Can't get module. Is it alive?");
2900                 return -EINVAL;
2901         }
2902 #endif
2903         switch (cmd) {
2904         case OBD_IOC_LOV_GET_CONFIG: {
2905                 char *buf;
2906                 struct lov_desc *desc;
2907                 struct obd_uuid uuid;
2908
2909                 buf = NULL;
2910                 len = 0;
2911                 if (obd_ioctl_getdata(&buf, &len, (void *)uarg))
2912                         GOTO(out, err = -EINVAL);
2913
2914                 data = (struct obd_ioctl_data *)buf;
2915
2916                 if (sizeof(*desc) > data->ioc_inllen1) {
2917                         OBD_FREE(buf, len);
2918                         GOTO(out, err = -EINVAL);
2919                 }
2920
2921                 if (data->ioc_inllen2 < sizeof(uuid)) {
2922                         OBD_FREE(buf, len);
2923                         GOTO(out, err = -EINVAL);
2924                 }
2925
2926                 if (data->ioc_inllen3 < sizeof(__u32)) {
2927                         OBD_FREE(buf, len);
2928                         GOTO(out, err = -EINVAL);
2929                 }
2930
2931                 desc = (struct lov_desc *)data->ioc_inlbuf1;
2932                 desc->ld_tgt_count = 1;
2933                 desc->ld_active_tgt_count = 1;
2934                 desc->ld_default_stripe_count = 1;
2935                 desc->ld_default_stripe_size = 0;
2936                 desc->ld_default_stripe_offset = 0;
2937                 desc->ld_pattern = 0;
2938                 memcpy(&desc->ld_uuid, &obd->obd_uuid, sizeof(uuid));
2939                 memcpy(data->ioc_inlbuf2, &obd->obd_uuid, sizeof(uuid));
2940                 *((__u32 *)data->ioc_inlbuf3) = 1;
2941
2942                 err = copy_to_user((void *)uarg, buf, len);
2943                 if (err)
2944                         err = -EFAULT;
2945                 obd_ioctl_freedata(buf, len);
2946                 GOTO(out, err);
2947         }
2948         case LL_IOC_LOV_SETSTRIPE:
2949                 err = obd_alloc_memmd(exp, karg);
2950                 if (err > 0)
2951                         err = 0;
2952                 GOTO(out, err);
2953         case LL_IOC_LOV_GETSTRIPE:
2954                 err = osc_getstripe(karg, uarg);
2955                 GOTO(out, err);
2956         case OBD_IOC_CLIENT_RECOVER:
2957                 err = ptlrpc_recover_import(obd->u.cli.cl_import,
2958                                             data->ioc_inlbuf1);
2959                 if (err > 0)
2960                         err = 0;
2961                 GOTO(out, err);
2962         case IOC_OSC_SET_ACTIVE:
2963                 err = ptlrpc_set_import_active(obd->u.cli.cl_import,
2964                                                data->ioc_offset);
2965                 GOTO(out, err);
2966         case IOC_OSC_CTL_RECOVERY:
2967                 err = ptlrpc_import_control_recovery(obd->u.cli.cl_import,
2968                                                      data->ioc_offset);
2969                 GOTO(out, err);
2970         default:
2971                 CDEBUG(D_INODE, "unrecognised ioctl %#x by %s\n", cmd, current->comm);
2972                 GOTO(out, err = -ENOTTY);
2973         }
2974 out:
2975 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
2976         MOD_DEC_USE_COUNT;
2977 #else
2978         module_put(THIS_MODULE);
2979 #endif
2980         return err;
2981 }
2982
2983 static int osc_get_info(struct obd_export *exp, __u32 keylen,
2984                         void *key, __u32 *vallen, void *val)
2985 {
2986         ENTRY;
2987         if (!vallen || !val)
2988                 RETURN(-EFAULT);
2989
2990         if (keylen > strlen("lock_to_stripe") &&
2991             strcmp(key, "lock_to_stripe") == 0) {
2992                 __u32 *stripe = val;
2993                 *vallen = sizeof(*stripe);
2994                 *stripe = 0;
2995                 RETURN(0);
2996         } else if (keylen >= strlen("last_id") && strcmp(key, "last_id") == 0) {
2997                 struct ptlrpc_request *req;
2998                 obd_id *reply;
2999                 char *bufs[1] = {key};
3000                 int rc;
3001                 req = ptlrpc_prep_req(class_exp2cliimp(exp), LUSTRE_OBD_VERSION,
3002                                       OST_GET_INFO, 1, (int *)&keylen, bufs);
3003                 if (req == NULL)
3004                         RETURN(-ENOMEM);
3005
3006                 req->rq_replen = lustre_msg_size(1, (int *)vallen);
3007                 rc = ptlrpc_queue_wait(req);
3008                 if (rc)
3009                         GOTO(out, rc);
3010
3011                 reply = lustre_swab_repbuf(req, 0, sizeof(*reply),
3012                                            lustre_swab_ost_last_id);
3013                 if (reply == NULL) {
3014                         CERROR("Can't unpack OST last ID\n");
3015                         GOTO(out, rc = -EPROTO);
3016                 }
3017                 *((obd_id *)val) = *reply;
3018         out:
3019                 ptlrpc_req_finished(req);
3020                 RETURN(rc);
3021         } else if (keylen == 10 && strcmp(key, "client_nid") == 0) {
3022                 struct ptlrpc_connection * conn;
3023                 ptl_nid_t * nid = val;
3024                 ptl_process_id_t id;
3025                 int rc;
3026
3027                 *vallen = sizeof(*nid);
3028                 conn = class_exp2cliimp(exp)->imp_connection;
3029
3030                 if (!conn || !conn->c_peer.peer_ni)
3031                         RETURN(-ENOTCONN);
3032
3033                 rc = PtlGetId(conn->c_peer.peer_ni->pni_ni_h, &id);
3034                 if (rc == PTL_OK)
3035                         *nid = id.nid;
3036
3037                 RETURN(0);
3038         }
3039         RETURN(-EPROTO);
3040 }
3041
3042 static int osc_set_info(struct obd_export *exp, obd_count keylen,
3043                         void *key, obd_count vallen, void *val)
3044 {
3045         struct obd_device  *obd = exp->exp_obd;
3046         struct obd_import *imp = class_exp2cliimp(exp);
3047         struct llog_ctxt *ctxt;
3048         int rc = 0;
3049         ENTRY;
3050
3051         if (keylen == strlen("unlinked") &&
3052             memcmp(key, "unlinked", keylen) == 0) {
3053                 struct osc_creator *oscc = &obd->u.cli.cl_oscc;
3054                 spin_lock(&oscc->oscc_lock);
3055                 oscc->oscc_flags &= ~OSCC_FLAG_NOSPC;
3056                 spin_unlock(&oscc->oscc_lock);
3057                 RETURN(0);
3058         }
3059
3060         if (keylen == strlen("unrecovery") &&
3061             memcmp(key, "unrecovery", keylen) == 0) {
3062                 struct osc_creator *oscc = &obd->u.cli.cl_oscc;
3063                 spin_lock(&oscc->oscc_lock);
3064                 oscc->oscc_flags &= ~OSCC_FLAG_RECOVERING;
3065                 spin_unlock(&oscc->oscc_lock);
3066                 RETURN(0);
3067         }
3068
3069         if (keylen == strlen("initial_recov") &&
3070             memcmp(key, "initial_recov", strlen("initial_recov")) == 0) {
3071                 struct obd_import *imp = class_exp2cliimp(exp);
3072                 if (vallen != sizeof(int))
3073                         RETURN(-EINVAL);
3074                 imp->imp_initial_recov = *(int *)val;
3075                 CDEBUG(D_HA, "%s: set imp_no_init_recov = %d\n",
3076                        exp->exp_obd->obd_name,
3077                        imp->imp_initial_recov);
3078                 RETURN(0);
3079         }
3080
3081         if (keylen == strlen("async") &&
3082             memcmp(key, "async", keylen) == 0) {
3083                 struct client_obd *cl = &obd->u.cli;
3084                 if (vallen != sizeof(int))
3085                         RETURN(-EINVAL);
3086                 cl->cl_async = *(int *)val;
3087                 CDEBUG(D_HA, "%s: set async = %d\n",
3088                        obd->obd_name, cl->cl_async);
3089                 RETURN(0);
3090         }
3091
3092         if (keylen == 5 && strcmp(key, "audit") == 0) {
3093                 struct ptlrpc_request *req;
3094                 char *bufs[2] = {key, val};
3095                 int size[2] = {keylen, vallen};
3096
3097                 req = ptlrpc_prep_req(class_exp2cliimp(exp), LUSTRE_OBD_VERSION,
3098                                       OST_SET_INFO, 2, size, bufs);
3099                 if (req == NULL)
3100                         RETURN(-ENOMEM);
3101
3102                 req->rq_replen = lustre_msg_size(0, size);
3103                 lustre_swab_reqbuf(req, 1, sizeof(struct audit_attr_msg),
3104                                    lustre_swab_audit_attr);
3105                 rc = ptlrpc_queue_wait(req);
3106
3107                 ptlrpc_req_finished(req);
3108                 RETURN(rc);
3109         }
3110
3111         if (keylen == 9 && strcmp(key, "audit_obj") == 0) {
3112                 struct ptlrpc_request *req;
3113                 char *bufs[2] = {key, val};
3114                 int size[2] = {keylen, vallen};
3115
3116                 req = ptlrpc_prep_req(class_exp2cliimp(exp), LUSTRE_OBD_VERSION,
3117                                       OST_SET_INFO, 2, size, bufs);
3118                 if (req == NULL)
3119                         RETURN(-ENOMEM);
3120
3121                 req->rq_replen = lustre_msg_size(0, size);
3122                 lustre_swab_reqbuf(req, 1, sizeof(struct obdo),
3123                                    lustre_swab_obdo);
3124                 rc = ptlrpc_queue_wait(req);
3125
3126                 ptlrpc_req_finished(req);
3127                 RETURN(rc);
3128         }
3129
3130         if (keylen == 8 && memcmp(key, "auditlog", 8) == 0) {
3131                 struct ptlrpc_request *req;
3132                 char *bufs[2] = {key, val};
3133                 int size[2] = {keylen, vallen};
3134
3135                 req = ptlrpc_prep_req(class_exp2cliimp(exp), LUSTRE_OBD_VERSION,
3136                                       OST_SET_INFO, 2, size, bufs);
3137                 if (req == NULL)
3138                         RETURN(-ENOMEM);
3139
3140                 req->rq_replen = lustre_msg_size(0, size);
3141                 lustre_swab_reqbuf(req, 1, sizeof(struct audit_msg),
3142                                    lustre_swab_audit_msg);
3143                 rc = ptlrpc_queue_wait(req);
3144
3145                 ptlrpc_req_finished(req);
3146                 RETURN(rc);
3147         }
3148
3149         if (keylen == strlen("sec") && memcmp(key, "sec", keylen) == 0) {
3150                 struct client_obd *cli = &exp->exp_obd->u.cli;
3151
3152                 cli->cl_sec_flavor = ptlrpcs_name2flavor(val);
3153                 if (cli->cl_sec_flavor == PTLRPCS_FLVR_INVALID) {
3154                         CERROR("unrecognized security flavor %s\n", (char*) val);
3155                         RETURN(-EINVAL);
3156                 }
3157
3158                 RETURN(0);
3159         }
3160
3161         if (keylen == strlen("sec_flags") &&
3162             memcmp(key, "sec_flags", keylen) == 0) {
3163                 struct client_obd *cli = &exp->exp_obd->u.cli;
3164
3165                 cli->cl_sec_flags = *((unsigned long *) val);
3166                 RETURN(0);
3167         }
3168
3169         if (keylen == strlen("flush_cred") &&
3170             memcmp(key, "flush_cred", keylen) == 0) {
3171                 struct client_obd *cli = &exp->exp_obd->u.cli;
3172
3173                 if (cli->cl_import)
3174                         ptlrpcs_import_flush_current_creds(cli->cl_import);
3175                 RETURN(0);
3176         }
3177         if (keylen == strlen("crypto_cb") &&
3178             memcmp(key, "crypto_cb", keylen) == 0) {
3179                 LASSERT(vallen == sizeof(crypt_cb_t));
3180                 osc_crypt_cb = (crypt_cb_t)val;
3181                 RETURN(0);
3182         }
3183
3184         if (keylen == 8 && memcmp(key, "capa_key", 8) == 0) {
3185                 struct ptlrpc_request *req;
3186                 char *bufs[2] = {key, val};
3187                 unsigned long irqflags;
3188                 int rc, size[2] = {keylen, vallen};
3189
3190                 LASSERT(vallen == sizeof(struct lustre_capa_key));
3191
3192                 req = ptlrpc_prep_req(class_exp2cliimp(exp), LUSTRE_OBD_VERSION,
3193                                       OST_SET_INFO, 2, size, bufs);
3194                 if (req == NULL)
3195                         RETURN(-ENOMEM);
3196
3197                 spin_lock_irqsave (&req->rq_lock, irqflags);
3198                 req->rq_replay = 1;
3199                 spin_unlock_irqrestore (&req->rq_lock, irqflags);
3200
3201                 req->rq_replen = lustre_msg_size(0, NULL);
3202                 rc = ptlrpc_queue_wait(req);
3203                 ptlrpc_req_finished(req);
3204                 RETURN(rc);
3205         }
3206
3207         if (keylen == strlen("setext") &&
3208             memcmp(key, "setext", keylen) == 0) {
3209                 struct client_obd *cli = &exp->exp_obd->u.cli;
3210                 struct osc_creator *oscc = &cli->cl_oscc;
3211                 struct fid_extent *ext = val;
3212
3213                 oscc->oscc_next_id = (obd_id)ext->fe_start;
3214                 RETURN(0);
3215         }
3216
3217         if (keylen < strlen("mds_conn") ||
3218             memcmp(key, "mds_conn", keylen) != 0)
3219                 RETURN(-EINVAL);
3220
3221         ctxt = llog_get_context(&exp->exp_obd->obd_llogs,
3222                                 LLOG_UNLINK_ORIG_CTXT);
3223         if (ctxt) {
3224                 if (rc == 0)
3225                         rc = llog_initiator_connect(ctxt);
3226                 else
3227                         CERROR("cannot establish the connect for "
3228                                "ctxt %p: %d\n", ctxt, rc);
3229         }
3230
3231         imp->imp_server_timeout = 1;
3232         CDEBUG(D_HA, "pinging OST %s\n", imp->imp_target_uuid.uuid);
3233         imp->imp_pingable = 1;
3234
3235         RETURN(rc);
3236 }
3237
3238
3239 static struct llog_operations osc_size_repl_logops = {
3240         lop_cancel: llog_obd_repl_cancel
3241 };
3242
3243 static struct llog_operations osc_unlink_orig_logops;
3244
3245 static int osc_llog_init(struct obd_device *obd, struct obd_llogs *llogs,
3246                          struct obd_device *tgt, int count,
3247                          struct llog_catid *catid)
3248 {
3249         int rc;
3250         ENTRY;
3251
3252         osc_unlink_orig_logops = llog_lvfs_ops;
3253         osc_unlink_orig_logops.lop_setup = llog_obd_origin_setup;
3254         osc_unlink_orig_logops.lop_cleanup = llog_catalog_cleanup;
3255         osc_unlink_orig_logops.lop_add = llog_catalog_add;
3256         osc_unlink_orig_logops.lop_connect = llog_origin_connect;
3257
3258         rc = obd_llog_setup(obd, llogs, LLOG_UNLINK_ORIG_CTXT, tgt, count,
3259                             &catid->lci_logid, &osc_unlink_orig_logops);
3260         if (rc)
3261                 RETURN(rc);
3262
3263         rc = obd_llog_setup(obd, llogs, LLOG_SIZE_REPL_CTXT, tgt, count, NULL,
3264                             &osc_size_repl_logops);
3265         RETURN(rc);
3266 }
3267
3268 static int osc_llog_finish(struct obd_device *obd,
3269                            struct obd_llogs *llogs, int count)
3270 {
3271         int rc;
3272         ENTRY;
3273
3274         rc = obd_llog_cleanup(llog_get_context(llogs, LLOG_UNLINK_ORIG_CTXT));
3275         if (rc)
3276                 RETURN(rc);
3277
3278         rc = obd_llog_cleanup(llog_get_context(llogs, LLOG_SIZE_REPL_CTXT));
3279         RETURN(rc);
3280 }
3281
3282 static int osc_connect(struct lustre_handle *exph,
3283                        struct obd_device *obd, struct obd_uuid *cluuid,
3284                        struct obd_connect_data *data,
3285                        unsigned long connect_flags)
3286 {
3287         int rc;
3288         ENTRY;
3289         rc = client_connect_import(exph, obd, cluuid, data, connect_flags);
3290         RETURN(rc);
3291 }
3292
3293 static int osc_disconnect(struct obd_export *exp, unsigned long flags)
3294 {
3295         struct obd_device *obd = class_exp2obd(exp);
3296         struct llog_ctxt *ctxt;
3297         int rc;
3298         ENTRY;
3299
3300         ctxt = llog_get_context(&obd->obd_llogs, LLOG_SIZE_REPL_CTXT);
3301         if (obd->u.cli.cl_conn_count == 1)
3302                 /* flush any remaining cancel messages out to the target */
3303                 llog_sync(ctxt, exp);
3304
3305         rc = client_disconnect_export(exp, flags);
3306         RETURN(rc);
3307 }
3308
3309 static int osc_import_event(struct obd_device *obd,
3310                             struct obd_import *imp,
3311                             enum obd_import_event event)
3312 {
3313         struct client_obd *cli;
3314         int rc = 0;
3315         ENTRY;
3316
3317         LASSERT(imp->imp_obd == obd);
3318
3319         switch (event) {
3320         case IMP_EVENT_DISCON: {
3321                 /* Only do this on the MDS OSC's */
3322                 if (imp->imp_server_timeout) {
3323                         struct osc_creator *oscc = &obd->u.cli.cl_oscc;
3324
3325                         spin_lock(&oscc->oscc_lock);
3326                         oscc->oscc_flags |= OSCC_FLAG_RECOVERING;
3327                         spin_unlock(&oscc->oscc_lock);
3328                 }
3329                 break;
3330         }
3331         case IMP_EVENT_INACTIVE: {
3332                 if (obd->obd_observer)
3333                         rc = obd_notify(obd->obd_observer, obd, 0, 0);
3334                 break;
3335         }
3336         case IMP_EVENT_INVALIDATE: {
3337                 struct ldlm_namespace *ns = obd->obd_namespace;
3338
3339                 /* Reset grants */
3340                 cli = &obd->u.cli;
3341                 spin_lock(&cli->cl_loi_list_lock);
3342                 cli->cl_avail_grant = 0;
3343                 cli->cl_lost_grant = 0;
3344                 /* all pages go to failing rpcs due to the invalid import */
3345                 osc_check_rpcs(cli);
3346                 spin_unlock(&cli->cl_loi_list_lock);
3347
3348                 ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
3349
3350                 break;
3351         }
3352         case IMP_EVENT_ACTIVE: {
3353                 /* Only do this on the MDS OSC's */
3354                 if (imp->imp_server_timeout) {
3355                         struct osc_creator *oscc = &obd->u.cli.cl_oscc;
3356
3357                         spin_lock(&oscc->oscc_lock);
3358                         oscc->oscc_flags &= ~OSCC_FLAG_NOSPC;
3359                         spin_unlock(&oscc->oscc_lock);
3360                 }
3361
3362                 if (obd->obd_observer)
3363                         rc = obd_notify(obd->obd_observer, obd, 1, 0);
3364                 break;
3365         }
3366         default:
3367                 CERROR("Unknown import event %d\n", event);
3368                 LBUG();
3369         }
3370         RETURN(rc);
3371 }
3372
3373 static int osc_attach(struct obd_device *dev, obd_count len, void *data)
3374 {
3375         struct lprocfs_static_vars lvars;
3376         int rc;
3377         ENTRY;
3378
3379         lprocfs_init_vars(osc,&lvars);
3380         rc = lprocfs_obd_attach(dev, lvars.obd_vars);
3381         if (rc < 0)
3382                 RETURN(rc);
3383
3384         rc = lproc_osc_attach_seqstat(dev);
3385         if (rc < 0) {
3386                 lprocfs_obd_detach(dev);
3387                 RETURN(rc);
3388         }
3389
3390         ptlrpc_lprocfs_register_obd(dev);
3391         RETURN(0);
3392 }
3393
3394 static int osc_detach(struct obd_device *dev)
3395 {
3396         ptlrpc_lprocfs_unregister_obd(dev);
3397         return lprocfs_obd_detach(dev);
3398 }
3399
3400 static int osc_setup(struct obd_device *obd, obd_count len, void *buf)
3401 {
3402         int rc;
3403         ENTRY;
3404         rc = ptlrpcd_addref();
3405         if (rc)
3406                 RETURN(rc);
3407
3408         rc = client_obd_setup(obd, len, buf);
3409         if (rc)
3410                 ptlrpcd_decref();
3411         else
3412                 oscc_init(obd);
3413
3414         RETURN(rc);
3415 }
3416
3417 static int osc_cleanup(struct obd_device *obd, int flags)
3418 {
3419         struct osc_creator *oscc = &obd->u.cli.cl_oscc;
3420         int rc;
3421
3422         rc = ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
3423                                     LDLM_FL_CONFIG_CHANGE, NULL);
3424         if (rc)
3425                 RETURN(rc);
3426
3427         spin_lock(&oscc->oscc_lock);
3428         oscc->oscc_flags &= ~OSCC_FLAG_RECOVERING;
3429         oscc->oscc_flags |= OSCC_FLAG_EXITING;
3430         spin_unlock(&oscc->oscc_lock);
3431
3432         rc = client_obd_cleanup(obd, flags);
3433         ptlrpcd_decref();
3434         RETURN(rc);
3435 }
3436
3437
3438 struct obd_ops osc_obd_ops = {
3439         .o_owner                = THIS_MODULE,
3440         .o_attach               = osc_attach,
3441         .o_detach               = osc_detach,
3442         .o_setup                = osc_setup,
3443         .o_cleanup              = osc_cleanup,
3444         .o_add_conn             = client_import_add_conn,
3445         .o_del_conn             = client_import_del_conn,
3446         .o_connect              = osc_connect,
3447         .o_disconnect           = osc_disconnect,
3448         .o_statfs               = osc_statfs,
3449         .o_packmd               = osc_packmd,
3450         .o_unpackmd             = osc_unpackmd,
3451         .o_create               = osc_create,
3452         .o_destroy              = osc_destroy,
3453         .o_getattr              = osc_getattr,
3454         .o_getattr_async        = osc_getattr_async,
3455         .o_setattr              = osc_setattr,
3456         .o_brw                  = osc_brw,
3457         .o_brw_async            = osc_brw_async,
3458         .o_prep_async_page      = osc_prep_async_page,
3459         .o_queue_async_io       = osc_queue_async_io,
3460         .o_set_async_flags      = osc_set_async_flags,
3461         .o_queue_group_io       = osc_queue_group_io,
3462         .o_trigger_group_io     = osc_trigger_group_io,
3463         .o_teardown_async_page  = osc_teardown_async_page,
3464         .o_punch                = osc_punch,
3465         .o_sync                 = osc_sync,
3466         .o_enqueue              = osc_enqueue,
3467         .o_match                = osc_match,
3468         .o_change_cbdata        = osc_change_cbdata,
3469         .o_cancel               = osc_cancel,
3470         .o_cancel_unused        = osc_cancel_unused,
3471         .o_iocontrol            = osc_iocontrol,
3472         .o_get_info             = osc_get_info,
3473         .o_set_info             = osc_set_info,
3474         .o_import_event         = osc_import_event,
3475         .o_llog_init            = osc_llog_init,
3476         .o_llog_finish          = osc_llog_finish,
3477 };
3478
3479 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
3480 struct obd_ops sanosc_obd_ops = {
3481         .o_owner                = THIS_MODULE,
3482         .o_attach               = osc_attach,
3483         .o_detach               = osc_detach,
3484         .o_cleanup              = client_obd_cleanup,
3485         .o_add_conn             = client_import_add_conn,
3486         .o_del_conn             = client_import_del_conn,
3487         .o_connect              = osc_connect,
3488         .o_disconnect           = client_disconnect_export,
3489         .o_statfs               = osc_statfs,
3490         .o_packmd               = osc_packmd,
3491         .o_unpackmd             = osc_unpackmd,
3492         .o_create               = osc_real_create,
3493         .o_destroy              = osc_destroy,
3494         .o_getattr              = osc_getattr,
3495         .o_getattr_async        = osc_getattr_async,
3496         .o_setattr              = osc_setattr,
3497         .o_setup                = client_sanobd_setup,
3498         .o_brw                  = sanosc_brw,
3499         .o_punch                = osc_punch,
3500         .o_sync                 = osc_sync,
3501         .o_enqueue              = osc_enqueue,
3502         .o_match                = osc_match,
3503         .o_change_cbdata        = osc_change_cbdata,
3504         .o_cancel               = osc_cancel,
3505         .o_cancel_unused        = osc_cancel_unused,
3506         .o_iocontrol            = osc_iocontrol,
3507         .o_import_event         = osc_import_event,
3508         .o_llog_init            = osc_llog_init,
3509         .o_llog_finish          = osc_llog_finish,
3510 };
3511 #endif
3512
3513 int __init osc_init(void)
3514 {
3515         struct lprocfs_static_vars lvars;
3516 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
3517         struct lprocfs_static_vars sanlvars;
3518 #endif
3519         int rc;
3520         ENTRY;
3521
3522         lprocfs_init_vars(osc, &lvars);
3523 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
3524         lprocfs_init_vars(osc, &sanlvars);
3525 #endif
3526
3527         rc = class_register_type(&osc_obd_ops, NULL, lvars.module_vars,
3528                                  OBD_OSC_DEVICENAME);
3529         if (rc)
3530                 RETURN(rc);
3531
3532 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
3533         rc = class_register_type(&sanosc_obd_ops, NULL, sanlvars.module_vars,
3534                                  OBD_SANOSC_DEVICENAME);
3535         if (rc)
3536                 class_unregister_type(OBD_OSC_DEVICENAME);
3537 #endif
3538
3539         RETURN(rc);
3540 }
3541
3542 #ifdef __KERNEL__
3543 static void /*__exit*/ osc_exit(void)
3544 {
3545 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
3546         class_unregister_type(OBD_SANOSC_DEVICENAME);
3547 #endif
3548         class_unregister_type(OBD_OSC_DEVICENAME);
3549 }
3550
3551 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
3552 MODULE_DESCRIPTION("Lustre Object Storage Client (OSC)");
3553 MODULE_LICENSE("GPL");
3554
3555 module_init(osc_init);
3556 module_exit(osc_exit);
3557 #endif