lustre/target/tgt_handler.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; if not, write to the
  18  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19  * Boston, MA 021110-1307, USA
  20  *
  21  * GPL HEADER END
  22  */
  23 /*
  24  * Copyright (c) 2012, 2015, Intel Corporation.
  25  */
  26 /*
  27  * lustre/target/tgt_handler.c
  28  *
  29  * Lustre Unified Target request handler code
  30  *
  31  * Author: Brian Behlendorf <behlendorf1@llnl.gov>
  32  * Author: Mikhail Pershin <mike.pershin@intel.com>
  33  */
  34
  35 #define DEBUG_SUBSYSTEM S_CLASS
  36
  37 #include <linux/user_namespace.h>
  38 #ifdef HAVE_UIDGID_HEADER
  39 # include <linux/uidgid.h>
  40 #endif
  41
  42 #include <obd.h>
  43 #include <obd_class.h>
  44 #include <obd_cksum.h>
  45 #include <md_object.h>
  46 #include <lustre_lfsck.h>
  47 #include <lustre_nodemap.h>
  48
  49 #include "tgt_internal.h"
  50
  51 char *tgt_name(struct lu_target *tgt)
  52 {
  53         LASSERT(tgt->lut_obd != NULL);
  54         return tgt->lut_obd->obd_name;
  55 }
  56 EXPORT_SYMBOL(tgt_name);
  57
  58 /*
  59  * Generic code handling requests that have struct mdt_body passed in:
  60  *
  61  *  - extract mdt_body from request and save it in @tsi, if present;
  62  *
  63  *  - create lu_object, corresponding to the fid in mdt_body, and save it in
  64  *  @tsi;
  65  *
  66  *  - if HABEO_CORPUS flag is set for this request type check whether object
  67  *  actually exists on storage (lu_object_exists()).
  68  *
  69  */
  70 static int tgt_mdt_body_unpack(struct tgt_session_info *tsi, __u32 flags)
  71 {
  72         const struct mdt_body   *body;
  73         struct lu_object        *obj;
  74         struct req_capsule      *pill = tsi->tsi_pill;
  75         int                      rc;
  76
  77         ENTRY;
  78
  79         body = req_capsule_client_get(pill, &RMF_MDT_BODY);
  80         if (body == NULL)
  81                 RETURN(-EFAULT);
  82
  83         tsi->tsi_mdt_body = body;
  84
  85         if (!(body->mbo_valid & OBD_MD_FLID))
  86                 RETURN(0);
  87
  88         /* mdc_pack_body() doesn't check if fid is zero and set OBD_ML_FID
  89          * in any case in pre-2.5 clients. Fix that here if needed */
  90         if (unlikely(fid_is_zero(&body->mbo_fid1)))
  91                 RETURN(0);
  92
  93         if (!fid_is_sane(&body->mbo_fid1)) {
  94                 CERROR("%s: invalid FID: "DFID"\n", tgt_name(tsi->tsi_tgt),
  95                        PFID(&body->mbo_fid1));
  96                 RETURN(-EINVAL);
  97         }
  98
  99         obj = lu_object_find(tsi->tsi_env,
 100                              &tsi->tsi_tgt->lut_bottom->dd_lu_dev,
 101                              &body->mbo_fid1, NULL);
 102         if (!IS_ERR(obj)) {
 103                 if ((flags & HABEO_CORPUS) && !lu_object_exists(obj)) {
 104                         lu_object_put(tsi->tsi_env, obj);
 105                         rc = -ENOENT;
 106                 } else {
 107                         tsi->tsi_corpus = obj;
 108                         rc = 0;
 109                 }
 110         } else {
 111                 rc = PTR_ERR(obj);
 112         }
 113
 114         tsi->tsi_fid = body->mbo_fid1;
 115
 116         RETURN(rc);
 117 }
 118
 119 /**
 120  * Validate oa from client.
 121  * If the request comes from 2.0 clients, currently only RSVD seq and IDIF
 122  * req are valid.
 123  *    a. objects in Single MDT FS  seq = FID_SEQ_OST_MDT0, oi_id != 0
 124  *    b. Echo objects(seq = 2), old echo client still use oi_id/oi_seq to
 125  *       pack ost_id. Because non-zero oi_seq will make it diffcult to tell
 126  *       whether this is oi_fid or real ostid. So it will check
 127  *       OBD_CONNECT_FID, then convert the ostid to FID for old client.
 128  *    c. Old FID-disable osc will send IDIF.
 129  *    d. new FID-enable osc/osp will send normal FID.
 130  *
 131  * And also oi_id/f_oid should always start from 1. oi_id/f_oid = 0 will
 132  * be used for LAST_ID file, and only being accessed inside OST now.
 133  */
 134 int tgt_validate_obdo(struct tgt_session_info *tsi, struct obdo *oa)
 135 {
 136         struct ost_id   *oi     = &oa->o_oi;
 137         u64              seq    = ostid_seq(oi);
 138         u64              id     = ostid_id(oi);
 139         int              rc;
 140         ENTRY;
 141
 142         if (unlikely(!(exp_connect_flags(tsi->tsi_exp) & OBD_CONNECT_FID) &&
 143                      fid_seq_is_echo(seq))) {
 144                 /* Sigh 2.[123] client still sends echo req with oi_id = 0
 145                  * during create, and we will reset this to 1, since this
 146                  * oi_id is basically useless in the following create process,
 147                  * but oi_id == 0 will make it difficult to tell whether it is
 148                  * real FID or ost_id. */
 149                 oi->oi_fid.f_seq = FID_SEQ_ECHO;
 150                 oi->oi_fid.f_oid = id ?: 1;
 151                 oi->oi_fid.f_ver = 0;
 152         } else {
 153                 struct tgt_thread_info *tti = tgt_th_info(tsi->tsi_env);
 154
 155                 if (unlikely((oa->o_valid & OBD_MD_FLID) && id == 0))
 156                         GOTO(out, rc = -EPROTO);
 157
 158                 /* Note: this check might be forced in 2.5 or 2.6, i.e.
 159                  * all of the requests are required to setup FLGROUP */
 160                 if (unlikely(!(oa->o_valid & OBD_MD_FLGROUP))) {
 161                         ostid_set_seq_mdt0(oi);
 162                         oa->o_valid |= OBD_MD_FLGROUP;
 163                         seq = ostid_seq(oi);
 164                 }
 165
 166                 if (unlikely(!(fid_seq_is_idif(seq) || fid_seq_is_mdt0(seq) ||
 167                                fid_seq_is_norm(seq) || fid_seq_is_echo(seq))))
 168                         GOTO(out, rc = -EPROTO);
 169
 170                 rc = ostid_to_fid(&tti->tti_fid1, oi,
 171                                   tsi->tsi_tgt->lut_lsd.lsd_osd_index);
 172                 if (unlikely(rc != 0))
 173                         GOTO(out, rc);
 174
 175                 oi->oi_fid = tti->tti_fid1;
 176         }
 177
 178         RETURN(0);
 179
 180 out:
 181         CERROR("%s: client %s sent bad object "DOSTID": rc = %d\n",
 182                tgt_name(tsi->tsi_tgt), obd_export_nid2str(tsi->tsi_exp),
 183                seq, id, rc);
 184         return rc;
 185 }
 186 EXPORT_SYMBOL(tgt_validate_obdo);
 187
 188 static int tgt_io_data_unpack(struct tgt_session_info *tsi, struct ost_id *oi)
 189 {
 190         unsigned                 max_brw;
 191         struct niobuf_remote    *rnb;
 192         struct obd_ioobj        *ioo;
 193         int                      obj_count;
 194
 195         ENTRY;
 196
 197         ioo = req_capsule_client_get(tsi->tsi_pill, &RMF_OBD_IOOBJ);
 198         if (ioo == NULL)
 199                 RETURN(-EPROTO);
 200
 201         rnb = req_capsule_client_get(tsi->tsi_pill, &RMF_NIOBUF_REMOTE);
 202         if (rnb == NULL)
 203                 RETURN(-EPROTO);
 204
 205         max_brw = ioobj_max_brw_get(ioo);
 206         if (unlikely((max_brw & (max_brw - 1)) != 0)) {
 207                 CERROR("%s: client %s sent bad ioobj max %u for "DOSTID
 208                        ": rc = %d\n", tgt_name(tsi->tsi_tgt),
 209                        obd_export_nid2str(tsi->tsi_exp), max_brw,
 210                        POSTID(oi), -EPROTO);
 211                 RETURN(-EPROTO);
 212         }
 213         ioo->ioo_oid = *oi;
 214
 215         obj_count = req_capsule_get_size(tsi->tsi_pill, &RMF_OBD_IOOBJ,
 216                                         RCL_CLIENT) / sizeof(*ioo);
 217         if (obj_count == 0) {
 218                 CERROR("%s: short ioobj\n", tgt_name(tsi->tsi_tgt));
 219                 RETURN(-EPROTO);
 220         } else if (obj_count > 1) {
 221                 CERROR("%s: too many ioobjs (%d)\n", tgt_name(tsi->tsi_tgt),
 222                        obj_count);
 223                 RETURN(-EPROTO);
 224         }
 225
 226         if (ioo->ioo_bufcnt == 0) {
 227                 CERROR("%s: ioo has zero bufcnt\n", tgt_name(tsi->tsi_tgt));
 228                 RETURN(-EPROTO);
 229         }
 230
 231         if (ioo->ioo_bufcnt > PTLRPC_MAX_BRW_PAGES) {
 232                 DEBUG_REQ(D_RPCTRACE, tgt_ses_req(tsi),
 233                           "bulk has too many pages (%d)",
 234                           ioo->ioo_bufcnt);
 235                 RETURN(-EPROTO);
 236         }
 237
 238         RETURN(0);
 239 }
 240
 241 static int tgt_ost_body_unpack(struct tgt_session_info *tsi, __u32 flags)
 242 {
 243         struct ost_body         *body;
 244         struct req_capsule      *pill = tsi->tsi_pill;
 245         struct lu_nodemap       *nodemap;
 246         int                      rc;
 247
 248         ENTRY;
 249
 250         body = req_capsule_client_get(pill, &RMF_OST_BODY);
 251         if (body == NULL)
 252                 RETURN(-EFAULT);
 253
 254         rc = tgt_validate_obdo(tsi, &body->oa);
 255         if (rc)
 256                 RETURN(rc);
 257
 258         nodemap = nodemap_get_from_exp(tsi->tsi_exp);
 259         if (IS_ERR(nodemap))
 260                 RETURN(PTR_ERR(nodemap));
 261
 262         body->oa.o_uid = nodemap_map_id(nodemap, NODEMAP_UID,
 263                                         NODEMAP_CLIENT_TO_FS,
 264                                         body->oa.o_uid);
 265         body->oa.o_gid = nodemap_map_id(nodemap, NODEMAP_GID,
 266                                         NODEMAP_CLIENT_TO_FS,
 267                                         body->oa.o_gid);
 268         nodemap_putref(nodemap);
 269
 270         tsi->tsi_ost_body = body;
 271         tsi->tsi_fid = body->oa.o_oi.oi_fid;
 272
 273         if (req_capsule_has_field(pill, &RMF_OBD_IOOBJ, RCL_CLIENT)) {
 274                 rc = tgt_io_data_unpack(tsi, &body->oa.o_oi);
 275                 if (rc < 0)
 276                         RETURN(rc);
 277         }
 278
 279         if (!(body->oa.o_valid & OBD_MD_FLID)) {
 280                 if (flags & HABEO_CORPUS) {
 281                         CERROR("%s: OBD_MD_FLID flag is not set in ost_body "
 282                                "but OID/FID is mandatory with HABEO_CORPUS\n",
 283                                tgt_name(tsi->tsi_tgt));
 284                         RETURN(-EPROTO);
 285                 } else {
 286                         RETURN(0);
 287                 }
 288         }
 289
 290         ost_fid_build_resid(&tsi->tsi_fid, &tsi->tsi_resid);
 291
 292         /*
 293          * OST doesn't get object in advance for further use to prevent
 294          * situations with nested object_find which is potential deadlock.
 295          */
 296         tsi->tsi_corpus = NULL;
 297         RETURN(rc);
 298 }
 299
 300 /*
 301  * Do necessary preprocessing according to handler ->th_flags.
 302  */
 303 static int tgt_request_preprocess(struct tgt_session_info *tsi,
 304                                   struct tgt_handler *h,
 305                                   struct ptlrpc_request *req)
 306 {
 307         struct req_capsule      *pill = tsi->tsi_pill;
 308         __u32                    flags = h->th_flags;
 309         int                      rc = 0;
 310
 311         ENTRY;
 312
 313         if (tsi->tsi_preprocessed)
 314                 RETURN(0);
 315
 316         LASSERT(h->th_act != NULL);
 317         LASSERT(h->th_opc == lustre_msg_get_opc(req->rq_reqmsg));
 318         LASSERT(current->journal_info == NULL);
 319
 320         LASSERT(ergo(flags & (HABEO_CORPUS | HABEO_REFERO),
 321                      h->th_fmt != NULL));
 322         if (h->th_fmt != NULL) {
 323                 req_capsule_set(pill, h->th_fmt);
 324                 if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_CLIENT)) {
 325                         rc = tgt_mdt_body_unpack(tsi, flags);
 326                         if (rc < 0)
 327                                 RETURN(rc);
 328                 } else if (req_capsule_has_field(pill, &RMF_OST_BODY,
 329                                                  RCL_CLIENT)) {
 330                         rc = tgt_ost_body_unpack(tsi, flags);
 331                         if (rc < 0)
 332                                 RETURN(rc);
 333                 }
 334         }
 335
 336         if (flags & MUTABOR && tgt_conn_flags(tsi) & OBD_CONNECT_RDONLY)
 337                 RETURN(-EROFS);
 338
 339         if (flags & HABEO_CLAVIS) {
 340                 struct ldlm_request *dlm_req;
 341
 342                 LASSERT(h->th_fmt != NULL);
 343
 344                 dlm_req = req_capsule_client_get(pill, &RMF_DLM_REQ);
 345                 if (dlm_req != NULL) {
 346                         if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
 347                                      LDLM_IBITS &&
 348                                      dlm_req->lock_desc.l_policy_data.\
 349                                      l_inodebits.bits == 0)) {
 350                                 /*
 351                                  * Lock without inodebits makes no sense and
 352                                  * will oops later in ldlm. If client miss to
 353                                  * set such bits, do not trigger ASSERTION.
 354                                  *
 355                                  * For liblustre flock case, it maybe zero.
 356                                  */
 357                                 rc = -EPROTO;
 358                         } else {
 359                                 tsi->tsi_dlm_req = dlm_req;
 360                         }
 361                 } else {
 362                         rc = -EFAULT;
 363                 }
 364         }
 365         tsi->tsi_preprocessed = 1;
 366         RETURN(rc);
 367 }
 368
 369 /*
 370  * Invoke handler for this request opc. Also do necessary preprocessing
 371  * (according to handler ->th_flags), and post-processing (setting of
 372  * ->last_{xid,committed}).
 373  */
 374 static int tgt_handle_request0(struct tgt_session_info *tsi,
 375                                struct tgt_handler *h,
 376                                struct ptlrpc_request *req)
 377 {
 378         int      serious = 0;
 379         int      rc;
 380         __u32    opc = lustre_msg_get_opc(req->rq_reqmsg);
 381
 382         ENTRY;
 383
 384
 385         /* When dealing with sec context requests, no export is associated yet,
 386          * because these requests are sent before *_CONNECT requests.
 387          * A NULL req->rq_export means the normal *_common_slice handlers will
 388          * not be called, because there is no reference to the target.
 389          * So deal with them by hand and jump directly to target_send_reply().
 390          */
 391         switch (opc) {
 392         case SEC_CTX_INIT:
 393         case SEC_CTX_INIT_CONT:
 394         case SEC_CTX_FINI:
 395                 CFS_FAIL_TIMEOUT(OBD_FAIL_SEC_CTX_HDL_PAUSE, cfs_fail_val);
 396                 GOTO(out, rc = 0);
 397         }
 398
 399         /*
 400          * Checking for various OBD_FAIL_$PREF_$OPC_NET codes. _Do_ not try
 401          * to put same checks into handlers like mdt_close(), mdt_reint(),
 402          * etc., without talking to mdt authors first. Checking same thing
 403          * there again is useless and returning 0 error without packing reply
 404          * is buggy! Handlers either pack reply or return error.
 405          *
 406          * We return 0 here and do not send any reply in order to emulate
 407          * network failure. Do not send any reply in case any of NET related
 408          * fail_id has occured.
 409          */
 410         if (OBD_FAIL_CHECK_ORSET(h->th_fail_id, OBD_FAIL_ONCE))
 411                 RETURN(0);
 412         if (unlikely(lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT &&
 413                      OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_MULTI_NET)))
 414                 RETURN(0);
 415
 416         rc = tgt_request_preprocess(tsi, h, req);
 417         /* pack reply if reply format is fixed */
 418         if (rc == 0 && h->th_flags & HABEO_REFERO) {
 419                 /* Pack reply */
 420                 if (req_capsule_has_field(tsi->tsi_pill, &RMF_MDT_MD,
 421                                           RCL_SERVER))
 422                         req_capsule_set_size(tsi->tsi_pill, &RMF_MDT_MD,
 423                                              RCL_SERVER,
 424                                              tsi->tsi_mdt_body->mbo_eadatasize);
 425                 if (req_capsule_has_field(tsi->tsi_pill, &RMF_LOGCOOKIES,
 426                                           RCL_SERVER))
 427                         req_capsule_set_size(tsi->tsi_pill, &RMF_LOGCOOKIES,
 428                                              RCL_SERVER, 0);
 429
 430                 rc = req_capsule_server_pack(tsi->tsi_pill);
 431         }
 432
 433         if (likely(rc == 0)) {
 434                 /*
 435                  * Process request, there can be two types of rc:
 436                  * 1) errors with msg unpack/pack, other failures outside the
 437                  * operation itself. This is counted as serious errors;
 438                  * 2) errors during fs operation, should be placed in rq_status
 439                  * only
 440                  */
 441                 rc = h->th_act(tsi);
 442                 if (!is_serious(rc) &&
 443                     !req->rq_no_reply && req->rq_reply_state == NULL) {
 444                         DEBUG_REQ(D_ERROR, req, "%s \"handler\" %s did not "
 445                                   "pack reply and returned 0 error\n",
 446                                   tgt_name(tsi->tsi_tgt), h->th_name);
 447                         LBUG();
 448                 }
 449                 serious = is_serious(rc);
 450                 rc = clear_serious(rc);
 451         } else {
 452                 serious = 1;
 453         }
 454
 455         req->rq_status = rc;
 456
 457         /*
 458          * ELDLM_* codes which > 0 should be in rq_status only as well as
 459          * all non-serious errors.
 460          */
 461         if (rc > 0 || !serious)
 462                 rc = 0;
 463
 464         LASSERT(current->journal_info == NULL);
 465
 466         if (likely(rc == 0 && req->rq_export))
 467                 target_committed_to_req(req);
 468
 469 out:
 470         target_send_reply(req, rc, tsi->tsi_reply_fail_id);
 471         RETURN(0);
 472 }
 473
 474 static int tgt_filter_recovery_request(struct ptlrpc_request *req,
 475                                        struct obd_device *obd, int *process)
 476 {
 477         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
 478         case MDS_DISCONNECT:
 479         case OST_DISCONNECT:
 480         case OBD_IDX_READ:
 481                 *process = 1;
 482                 RETURN(0);
 483         case MDS_CLOSE:
 484         case MDS_SYNC: /* used in unmounting */
 485         case OBD_PING:
 486         case MDS_REINT:
 487         case OUT_UPDATE:
 488         case SEQ_QUERY:
 489         case FLD_QUERY:
 490         case FLD_READ:
 491         case LDLM_ENQUEUE:
 492         case OST_CREATE:
 493         case OST_DESTROY:
 494         case OST_PUNCH:
 495         case OST_SETATTR:
 496         case OST_SYNC:
 497         case OST_WRITE:
 498         case MDS_HSM_PROGRESS:
 499         case MDS_HSM_STATE_SET:
 500         case MDS_HSM_REQUEST:
 501                 *process = target_queue_recovery_request(req, obd);
 502                 RETURN(0);
 503
 504         default:
 505                 DEBUG_REQ(D_ERROR, req, "not permitted during recovery");
 506                 *process = -EAGAIN;
 507                 RETURN(0);
 508         }
 509 }
 510
 511 /*
 512  * Handle recovery. Return:
 513  *        +1: continue request processing;
 514  *       -ve: abort immediately with the given error code;
 515  *         0: send reply with error code in req->rq_status;
 516  */
 517 static int tgt_handle_recovery(struct ptlrpc_request *req, int reply_fail_id)
 518 {
 519         ENTRY;
 520
 521         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
 522         case MDS_CONNECT:
 523         case OST_CONNECT:
 524         case MGS_CONNECT:
 525         case SEC_CTX_INIT:
 526         case SEC_CTX_INIT_CONT:
 527         case SEC_CTX_FINI:
 528                 RETURN(+1);
 529         }
 530
 531         if (!req->rq_export->exp_obd->obd_replayable)
 532                 RETURN(+1);
 533
 534         /* sanity check: if the xid matches, the request must be marked as a
 535          * resent or replayed */
 536         if (req_can_reconstruct(req, NULL)) {
 537                 if (!(lustre_msg_get_flags(req->rq_reqmsg) &
 538                       (MSG_RESENT | MSG_REPLAY))) {
 539                         DEBUG_REQ(D_WARNING, req, "rq_xid "LPU64" matches "
 540                                   "saved xid, expected REPLAY or RESENT flag "
 541                                   "(%x)", req->rq_xid,
 542                                   lustre_msg_get_flags(req->rq_reqmsg));
 543                         req->rq_status = -ENOTCONN;
 544                         RETURN(-ENOTCONN);
 545                 }
 546         }
 547         /* else: note the opposite is not always true; a RESENT req after a
 548          * failover will usually not match the last_xid, since it was likely
 549          * never committed. A REPLAYed request will almost never match the
 550          * last xid, however it could for a committed, but still retained,
 551          * open. */
 552
 553         /* Check for aborted recovery... */
 554         if (unlikely(req->rq_export->exp_obd->obd_recovering)) {
 555                 int rc;
 556                 int should_process;
 557
 558                 DEBUG_REQ(D_INFO, req, "Got new replay");
 559                 rc = tgt_filter_recovery_request(req, req->rq_export->exp_obd,
 560                                                  &should_process);
 561                 if (rc != 0 || !should_process)
 562                         RETURN(rc);
 563                 else if (should_process < 0) {
 564                         req->rq_status = should_process;
 565                         rc = ptlrpc_error(req);
 566                         RETURN(rc);
 567                 }
 568         }
 569         RETURN(+1);
 570 }
 571
 572 /* Initial check for request, it is validation mostly */
 573 static struct tgt_handler *tgt_handler_find_check(struct ptlrpc_request *req)
 574 {
 575         struct tgt_handler      *h;
 576         struct tgt_opc_slice    *s;
 577         struct lu_target        *tgt;
 578         __u32                    opc = lustre_msg_get_opc(req->rq_reqmsg);
 579
 580         ENTRY;
 581
 582         tgt = class_exp2tgt(req->rq_export);
 583         if (unlikely(tgt == NULL)) {
 584                 DEBUG_REQ(D_ERROR, req, "%s: No target for connected export\n",
 585                           class_exp2obd(req->rq_export)->obd_name);
 586                 RETURN(ERR_PTR(-EINVAL));
 587         }
 588
 589         for (s = tgt->lut_slice; s->tos_hs != NULL; s++)
 590                 if (s->tos_opc_start <= opc && opc < s->tos_opc_end)
 591                         break;
 592
 593         /* opcode was not found in slice */
 594         if (unlikely(s->tos_hs == NULL)) {
 595                 CERROR("%s: no handlers for opcode 0x%x\n", tgt_name(tgt),
 596                        opc);
 597                 RETURN(ERR_PTR(-ENOTSUPP));
 598         }
 599
 600         LASSERT(opc >= s->tos_opc_start && opc < s->tos_opc_end);
 601         h = s->tos_hs + (opc - s->tos_opc_start);
 602         if (unlikely(h->th_opc == 0)) {
 603                 CERROR("%s: unsupported opcode 0x%x\n", tgt_name(tgt), opc);
 604                 RETURN(ERR_PTR(-ENOTSUPP));
 605         }
 606
 607         RETURN(h);
 608 }
 609
 610 static int process_req_last_xid(struct ptlrpc_request *req)
 611 {
 612         __u64   last_xid;
 613         ENTRY;
 614
 615         /* check request's xid is consistent with export's last_xid */
 616         last_xid = lustre_msg_get_last_xid(req->rq_reqmsg);
 617         if (last_xid > req->rq_export->exp_last_xid)
 618                 req->rq_export->exp_last_xid = last_xid;
 619
 620         if (req->rq_xid == 0 ||
 621             (req->rq_xid <= req->rq_export->exp_last_xid)) {
 622                 DEBUG_REQ(D_ERROR, req, "Unexpected xid %llx vs. "
 623                           "last_xid %llx\n", req->rq_xid,
 624                           req->rq_export->exp_last_xid);
 625                 /* Some request is allowed to be sent during replay,
 626                  * such as OUT update requests, FLD requests, so it
 627                  * is possible that replay requests has smaller XID
 628                  * than the exp_last_xid.
 629                  *
 630                  * Some non-replay requests may have smaller XID as
 631                  * well:
 632                  *
 633                  * - Client send a no_resend RPC, like statfs;
 634                  * - The RPC timedout (or some other error) on client,
 635                  *   then it's removed from the unreplied list;
 636                  * - Client send some other request to bump the
 637                  *   exp_last_xid on server;
 638                  * - The former RPC got chance to be processed;
 639                  */
 640                 if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY))
 641                         RETURN(-EPROTO);
 642         }
 643
 644         /* try to release in-memory reply data */
 645         if (tgt_is_multimodrpcs_client(req->rq_export)) {
 646                 tgt_handle_received_xid(req->rq_export,
 647                                 lustre_msg_get_last_xid(req->rq_reqmsg));
 648                 if (!(lustre_msg_get_flags(req->rq_reqmsg) &
 649                       (MSG_RESENT | MSG_REPLAY)))
 650                         tgt_handle_tag(req->rq_export,
 651                                        lustre_msg_get_tag(req->rq_reqmsg));
 652         }
 653         RETURN(0);
 654 }
 655
 656 int tgt_request_handle(struct ptlrpc_request *req)
 657 {
 658         struct tgt_session_info *tsi = tgt_ses_info(req->rq_svc_thread->t_env);
 659
 660         struct lustre_msg       *msg = req->rq_reqmsg;
 661         struct tgt_handler      *h;
 662         struct lu_target        *tgt;
 663         int                      request_fail_id = 0;
 664         __u32                    opc = lustre_msg_get_opc(msg);
 665         struct obd_device       *obd;
 666         int                      rc;
 667         bool                     is_connect = false;
 668         ENTRY;
 669
 670         /* Refill the context, to make sure all thread keys are allocated */
 671         lu_env_refill(req->rq_svc_thread->t_env);
 672
 673         req_capsule_init(&req->rq_pill, req, RCL_SERVER);
 674         tsi->tsi_pill = &req->rq_pill;
 675         tsi->tsi_env = req->rq_svc_thread->t_env;
 676
 677         /* if request has export then get handlers slice from corresponding
 678          * target, otherwise that should be connect operation */
 679         if (opc == MDS_CONNECT || opc == OST_CONNECT ||
 680             opc == MGS_CONNECT) {
 681                 is_connect = true;
 682                 req_capsule_set(&req->rq_pill, &RQF_CONNECT);
 683                 rc = target_handle_connect(req);
 684                 if (rc != 0) {
 685                         rc = ptlrpc_error(req);
 686                         GOTO(out, rc);
 687                 }
 688                 /* recovery-small test 18c asks to drop connect reply */
 689                 if (unlikely(opc == OST_CONNECT &&
 690                              OBD_FAIL_CHECK(OBD_FAIL_OST_CONNECT_NET2)))
 691                         GOTO(out, rc = 0);
 692         }
 693
 694         if (unlikely(!class_connected_export(req->rq_export))) {
 695                 if (opc == SEC_CTX_INIT || opc == SEC_CTX_INIT_CONT ||
 696                     opc == SEC_CTX_FINI) {
 697                         /* sec context initialization has to be handled
 698                          * by hand in tgt_handle_request0() */
 699                         tsi->tsi_reply_fail_id = OBD_FAIL_SEC_CTX_INIT_NET;
 700                         h = NULL;
 701                         GOTO(handle_recov, rc = 0);
 702                 }
 703                 CDEBUG(D_HA, "operation %d on unconnected OST from %s\n",
 704                        opc, libcfs_id2str(req->rq_peer));
 705                 req->rq_status = -ENOTCONN;
 706                 rc = ptlrpc_error(req);
 707                 GOTO(out, rc);
 708         }
 709
 710         tsi->tsi_tgt = tgt = class_exp2tgt(req->rq_export);
 711         tsi->tsi_exp = req->rq_export;
 712         if (exp_connect_flags(req->rq_export) & OBD_CONNECT_JOBSTATS)
 713                 tsi->tsi_jobid = lustre_msg_get_jobid(req->rq_reqmsg);
 714         else
 715                 tsi->tsi_jobid = NULL;
 716
 717         if (tgt == NULL) {
 718                 DEBUG_REQ(D_ERROR, req, "%s: No target for connected export\n",
 719                           class_exp2obd(req->rq_export)->obd_name);
 720                 req->rq_status = -EINVAL;
 721                 rc = ptlrpc_error(req);
 722                 GOTO(out, rc);
 723         }
 724
 725         /* Skip last_xid processing for the recovery thread, otherwise, the
 726          * last_xid on same request could be processed twice: first time when
 727          * processing the incoming request, second time when the request is
 728          * being processed by recovery thread. */
 729         obd = class_exp2obd(req->rq_export);
 730         if (is_connect) {
 731                 /* reset the exp_last_xid on each connection. */
 732                 req->rq_export->exp_last_xid = 0;
 733         } else if (obd->obd_recovery_data.trd_processing_task !=
 734                    current_pid()) {
 735                 rc = process_req_last_xid(req);
 736                 if (rc) {
 737                         req->rq_status = rc;
 738                         rc = ptlrpc_error(req);
 739                         GOTO(out, rc);
 740                 }
 741         }
 742
 743         request_fail_id = tgt->lut_request_fail_id;
 744         tsi->tsi_reply_fail_id = tgt->lut_reply_fail_id;
 745
 746         h = tgt_handler_find_check(req);
 747         if (IS_ERR(h)) {
 748                 req->rq_status = PTR_ERR(h);
 749                 rc = ptlrpc_error(req);
 750                 GOTO(out, rc);
 751         }
 752
 753         LASSERTF(h->th_opc == opc, "opcode mismatch %d != %d\n",
 754                  h->th_opc, opc);
 755
 756         if (CFS_FAIL_CHECK_ORSET(request_fail_id, CFS_FAIL_ONCE))
 757                 GOTO(out, rc = 0);
 758
 759         rc = lustre_msg_check_version(msg, h->th_version);
 760         if (unlikely(rc)) {
 761                 DEBUG_REQ(D_ERROR, req, "%s: drop mal-formed request, version"
 762                           " %08x, expecting %08x\n", tgt_name(tgt),
 763                           lustre_msg_get_version(msg), h->th_version);
 764                 req->rq_status = -EINVAL;
 765                 rc = ptlrpc_error(req);
 766                 GOTO(out, rc);
 767         }
 768
 769 handle_recov:
 770         rc = tgt_handle_recovery(req, tsi->tsi_reply_fail_id);
 771         if (likely(rc == 1)) {
 772                 rc = tgt_handle_request0(tsi, h, req);
 773                 if (rc)
 774                         GOTO(out, rc);
 775         }
 776         EXIT;
 777 out:
 778         req_capsule_fini(tsi->tsi_pill);
 779         if (tsi->tsi_corpus != NULL) {
 780                 lu_object_put(tsi->tsi_env, tsi->tsi_corpus);
 781                 tsi->tsi_corpus = NULL;
 782         }
 783         return rc;
 784 }
 785 EXPORT_SYMBOL(tgt_request_handle);
 786
 787 /** Assign high priority operations to the request if needed. */
 788 int tgt_hpreq_handler(struct ptlrpc_request *req)
 789 {
 790         struct tgt_session_info *tsi = tgt_ses_info(req->rq_svc_thread->t_env);
 791         struct tgt_handler      *h;
 792         int                      rc;
 793
 794         ENTRY;
 795
 796         if (req->rq_export == NULL)
 797                 RETURN(0);
 798
 799         req_capsule_init(&req->rq_pill, req, RCL_SERVER);
 800         tsi->tsi_pill = &req->rq_pill;
 801         tsi->tsi_env = req->rq_svc_thread->t_env;
 802         tsi->tsi_tgt = class_exp2tgt(req->rq_export);
 803         tsi->tsi_exp = req->rq_export;
 804
 805         h = tgt_handler_find_check(req);
 806         if (IS_ERR(h)) {
 807                 rc = PTR_ERR(h);
 808                 RETURN(rc);
 809         }
 810
 811         rc = tgt_request_preprocess(tsi, h, req);
 812         if (unlikely(rc != 0))
 813                 RETURN(rc);
 814
 815         if (h->th_hp != NULL)
 816                 h->th_hp(tsi);
 817         RETURN(0);
 818 }
 819 EXPORT_SYMBOL(tgt_hpreq_handler);
 820
 821 void tgt_counter_incr(struct obd_export *exp, int opcode)
 822 {
 823         lprocfs_counter_incr(exp->exp_obd->obd_stats, opcode);
 824         if (exp->exp_nid_stats && exp->exp_nid_stats->nid_stats != NULL)
 825                 lprocfs_counter_incr(exp->exp_nid_stats->nid_stats, opcode);
 826 }
 827 EXPORT_SYMBOL(tgt_counter_incr);
 828
 829 /*
 830  * Unified target generic handlers.
 831  */
 832
 833 /*
 834  * Security functions
 835  */
 836 static inline void tgt_init_sec_none(struct obd_connect_data *reply)
 837 {
 838 }
 839
 840 static int tgt_init_sec_level(struct ptlrpc_request *req)
 841 {
 842         struct lu_target        *tgt = class_exp2tgt(req->rq_export);
 843         char                    *client;
 844         struct obd_connect_data *data, *reply;
 845         int                      rc = 0;
 846         ENTRY;
 847
 848         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 849         reply = req_capsule_server_get(&req->rq_pill, &RMF_CONNECT_DATA);
 850         if (data == NULL || reply == NULL)
 851                 RETURN(-EFAULT);
 852
 853         /* connection from MDT is always trusted */
 854         if (req->rq_auth_usr_mdt) {
 855                 tgt_init_sec_none(reply);
 856                 RETURN(0);
 857         }
 858
 859         if (unlikely(tgt == NULL)) {
 860                 DEBUG_REQ(D_ERROR, req, "%s: No target for connected export\n",
 861                           class_exp2obd(req->rq_export)->obd_name);
 862                 RETURN(-EINVAL);
 863         }
 864
 865         client = libcfs_nid2str(req->rq_peer.nid);
 866         /* no GSS support case */
 867         if (!req->rq_auth_gss) {
 868                 if (tgt->lut_sec_level > LUSTRE_SEC_NONE) {
 869                         CWARN("client %s -> target %s does not use GSS, "
 870                               "can not run under security level %d.\n",
 871                               client, tgt_name(tgt), tgt->lut_sec_level);
 872                         RETURN(-EACCES);
 873                 } else {
 874                         tgt_init_sec_none(reply);
 875                         RETURN(0);
 876                 }
 877         }
 878
 879         /* old version case */
 880         if (unlikely(!(data->ocd_connect_flags & OBD_CONNECT_MDS_CAPA) ||
 881                      !(data->ocd_connect_flags & OBD_CONNECT_OSS_CAPA))) {
 882                 if (tgt->lut_sec_level > LUSTRE_SEC_NONE) {
 883                         CWARN("client %s -> target %s uses old version, "
 884                               "can not run under security level %d.\n",
 885                               client, tgt_name(tgt), tgt->lut_sec_level);
 886                         RETURN(-EACCES);
 887                 } else {
 888                         CWARN("client %s -> target %s uses old version, "
 889                               "run under security level %d.\n",
 890                               client, tgt_name(tgt), tgt->lut_sec_level);
 891                         tgt_init_sec_none(reply);
 892                         RETURN(0);
 893                 }
 894         }
 895
 896         if (!uid_valid(make_kuid(&init_user_ns, req->rq_auth_uid))) {
 897                 CDEBUG(D_SEC, "client %s -> target %s: user is not "
 898                        "authenticated!\n", client, tgt_name(tgt));
 899                 RETURN(-EACCES);
 900         }
 901
 902         switch (tgt->lut_sec_level) {
 903         case LUSTRE_SEC_NONE:
 904         case LUSTRE_SEC_REMOTE:
 905                 tgt_init_sec_none(reply);
 906                 break;
 907         case LUSTRE_SEC_ALL:
 908                 reply->ocd_connect_flags &= ~OBD_CONNECT_OSS_CAPA;
 909                 reply->ocd_connect_flags &= ~OBD_CONNECT_MDS_CAPA;
 910                 break;
 911         default:
 912                 RETURN(-EINVAL);
 913         }
 914
 915         RETURN(rc);
 916 }
 917
 918 int tgt_connect_check_sptlrpc(struct ptlrpc_request *req, struct obd_export *exp)
 919 {
 920         struct lu_target        *tgt = class_exp2tgt(exp);
 921         struct sptlrpc_flavor    flvr;
 922         int                      rc = 0;
 923
 924         LASSERT(tgt);
 925         LASSERT(tgt->lut_obd);
 926         LASSERT(tgt->lut_slice);
 927
 928         /* always allow ECHO client */
 929         if (unlikely(strcmp(exp->exp_obd->obd_type->typ_name,
 930                             LUSTRE_ECHO_NAME) == 0)) {
 931                 exp->exp_flvr.sf_rpc = SPTLRPC_FLVR_ANY;
 932                 return 0;
 933         }
 934
 935         if (exp->exp_flvr.sf_rpc == SPTLRPC_FLVR_INVALID) {
 936                 read_lock(&tgt->lut_sptlrpc_lock);
 937                 sptlrpc_target_choose_flavor(&tgt->lut_sptlrpc_rset,
 938                                              req->rq_sp_from,
 939                                              req->rq_peer.nid,
 940                                              &flvr);
 941                 read_unlock(&tgt->lut_sptlrpc_lock);
 942
 943                 spin_lock(&exp->exp_lock);
 944                 exp->exp_sp_peer = req->rq_sp_from;
 945                 exp->exp_flvr = flvr;
 946
 947                 /* when on mgs, if no restriction is set, or if client
 948                  * is loopback, allow any flavor */
 949                 if ((strcmp(exp->exp_obd->obd_type->typ_name,
 950                            LUSTRE_MGS_NAME) == 0) &&
 951                      (exp->exp_flvr.sf_rpc == SPTLRPC_FLVR_NULL ||
 952                       LNET_NETTYP(LNET_NIDNET(exp->exp_connection->c_peer.nid))
 953                       == LOLND))
 954                         exp->exp_flvr.sf_rpc = SPTLRPC_FLVR_ANY;
 955
 956                 if (exp->exp_flvr.sf_rpc != SPTLRPC_FLVR_ANY &&
 957                     exp->exp_flvr.sf_rpc != req->rq_flvr.sf_rpc) {
 958                         CERROR("%s: unauthorized rpc flavor %x from %s, "
 959                                "expect %x\n", tgt_name(tgt),
 960                                req->rq_flvr.sf_rpc,
 961                                libcfs_nid2str(req->rq_peer.nid),
 962                                exp->exp_flvr.sf_rpc);
 963                         rc = -EACCES;
 964                 }
 965                 spin_unlock(&exp->exp_lock);
 966         } else {
 967                 if (exp->exp_sp_peer != req->rq_sp_from) {
 968                         CERROR("%s: RPC source %s doesn't match %s\n",
 969                                tgt_name(tgt),
 970                                sptlrpc_part2name(req->rq_sp_from),
 971                                sptlrpc_part2name(exp->exp_sp_peer));
 972                         rc = -EACCES;
 973                 } else {
 974                         rc = sptlrpc_target_export_check(exp, req);
 975                 }
 976         }
 977
 978         return rc;
 979 }
 980
 981 int tgt_adapt_sptlrpc_conf(struct lu_target *tgt, int initial)
 982 {
 983         struct sptlrpc_rule_set  tmp_rset;
 984         int                      rc;
 985
 986         if (unlikely(tgt == NULL)) {
 987                 CERROR("No target passed");
 988                 return -EINVAL;
 989         }
 990
 991         sptlrpc_rule_set_init(&tmp_rset);
 992         rc = sptlrpc_conf_target_get_rules(tgt->lut_obd, &tmp_rset, initial);
 993         if (rc) {
 994                 CERROR("%s: failed get sptlrpc rules: rc = %d\n",
 995                        tgt_name(tgt), rc);
 996                 return rc;
 997         }
 998
 999         sptlrpc_target_update_exp_flavor(tgt->lut_obd, &tmp_rset);
1000
1001         write_lock(&tgt->lut_sptlrpc_lock);
1002         sptlrpc_rule_set_free(&tgt->lut_sptlrpc_rset);
1003         tgt->lut_sptlrpc_rset = tmp_rset;
1004         write_unlock(&tgt->lut_sptlrpc_lock);
1005
1006         return 0;
1007 }
1008 EXPORT_SYMBOL(tgt_adapt_sptlrpc_conf);
1009
1010 int tgt_connect(struct tgt_session_info *tsi)
1011 {
1012         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1013         struct obd_connect_data *reply;
1014         int                      rc;
1015
1016         ENTRY;
1017
1018         rc = tgt_init_sec_level(req);
1019         if (rc != 0)
1020                 GOTO(out, rc);
1021
1022         /* XXX: better to call this check right after getting new export but
1023          * before last_rcvd slot allocation to avoid server load upon insecure
1024          * connects. This is to be fixed after unifiyng all targets.
1025          */
1026         rc = tgt_connect_check_sptlrpc(req, tsi->tsi_exp);
1027         if (rc)
1028                 GOTO(out, rc);
1029
1030         /* To avoid exposing partially initialized connection flags, changes up
1031          * to this point have been staged in reply->ocd_connect_flags. Now that
1032          * connection handling has completed successfully, atomically update
1033          * the connect flags in the shared export data structure. LU-1623 */
1034         reply = req_capsule_server_get(tsi->tsi_pill, &RMF_CONNECT_DATA);
1035         spin_lock(&tsi->tsi_exp->exp_lock);
1036         *exp_connect_flags_ptr(tsi->tsi_exp) = reply->ocd_connect_flags;
1037         tsi->tsi_exp->exp_connect_data.ocd_brw_size = reply->ocd_brw_size;
1038         spin_unlock(&tsi->tsi_exp->exp_lock);
1039
1040         RETURN(0);
1041 out:
1042         obd_disconnect(class_export_get(tsi->tsi_exp));
1043         return rc;
1044 }
1045 EXPORT_SYMBOL(tgt_connect);
1046
1047 int tgt_disconnect(struct tgt_session_info *tsi)
1048 {
1049         int rc;
1050
1051         ENTRY;
1052
1053         rc = target_handle_disconnect(tgt_ses_req(tsi));
1054         if (rc)
1055                 RETURN(err_serious(rc));
1056
1057         RETURN(rc);
1058 }
1059 EXPORT_SYMBOL(tgt_disconnect);
1060
1061 /*
1062  * Unified target OBD handlers
1063  */
1064 int tgt_obd_ping(struct tgt_session_info *tsi)
1065 {
1066         int rc;
1067
1068         ENTRY;
1069
1070         rc = target_handle_ping(tgt_ses_req(tsi));
1071         if (rc)
1072                 RETURN(err_serious(rc));
1073
1074         RETURN(rc);
1075 }
1076 EXPORT_SYMBOL(tgt_obd_ping);
1077
1078 int tgt_obd_log_cancel(struct tgt_session_info *tsi)
1079 {
1080         return err_serious(-EOPNOTSUPP);
1081 }
1082
1083 int tgt_send_buffer(struct tgt_session_info *tsi, struct lu_rdbuf *rdbuf)
1084 {
1085         struct tgt_thread_info  *tti = tgt_th_info(tsi->tsi_env);
1086         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1087         struct obd_export       *exp = req->rq_export;
1088         struct ptlrpc_bulk_desc *desc;
1089         struct l_wait_info      *lwi = &tti->tti_u.update.tti_wait_info;
1090         int                      i;
1091         int                      rc;
1092
1093         ENTRY;
1094
1095         desc = ptlrpc_prep_bulk_exp(req, rdbuf->rb_nbufs, 1,
1096                                   PTLRPC_BULK_PUT_SOURCE | PTLRPC_BULK_BUF_KVEC,
1097                                     MDS_BULK_PORTAL, &ptlrpc_bulk_kvec_ops);
1098         if (desc == NULL)
1099                 RETURN(-ENOMEM);
1100
1101         for (i = 0; i < rdbuf->rb_nbufs; i++)
1102                 desc->bd_frag_ops->add_iov_frag(desc,
1103                                         rdbuf->rb_bufs[i].lb_buf,
1104                                         rdbuf->rb_bufs[i].lb_len);
1105
1106         rc = target_bulk_io(exp, desc, lwi);
1107         ptlrpc_free_bulk(desc);
1108         RETURN(rc);
1109 }
1110 EXPORT_SYMBOL(tgt_send_buffer);
1111
1112 int tgt_sendpage(struct tgt_session_info *tsi, struct lu_rdpg *rdpg, int nob)
1113 {
1114         struct tgt_thread_info  *tti = tgt_th_info(tsi->tsi_env);
1115         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1116         struct obd_export       *exp = req->rq_export;
1117         struct ptlrpc_bulk_desc *desc;
1118         struct l_wait_info      *lwi = &tti->tti_u.rdpg.tti_wait_info;
1119         int                      tmpcount;
1120         int                      tmpsize;
1121         int                      i;
1122         int                      rc;
1123
1124         ENTRY;
1125
1126         desc = ptlrpc_prep_bulk_exp(req, rdpg->rp_npages, 1,
1127                                     PTLRPC_BULK_PUT_SOURCE |
1128                                         PTLRPC_BULK_BUF_KIOV,
1129                                     MDS_BULK_PORTAL,
1130                                     &ptlrpc_bulk_kiov_pin_ops);
1131         if (desc == NULL)
1132                 RETURN(-ENOMEM);
1133
1134         if (!(exp_connect_flags(exp) & OBD_CONNECT_BRW_SIZE))
1135                 /* old client requires reply size in it's PAGE_CACHE_SIZE,
1136                  * which is rdpg->rp_count */
1137                 nob = rdpg->rp_count;
1138
1139         for (i = 0, tmpcount = nob; i < rdpg->rp_npages && tmpcount > 0;
1140              i++, tmpcount -= tmpsize) {
1141                 tmpsize = min_t(int, tmpcount, PAGE_CACHE_SIZE);
1142                 desc->bd_frag_ops->add_kiov_frag(desc, rdpg->rp_pages[i], 0,
1143                                                  tmpsize);
1144         }
1145
1146         LASSERT(desc->bd_nob == nob);
1147         rc = target_bulk_io(exp, desc, lwi);
1148         ptlrpc_free_bulk(desc);
1149         RETURN(rc);
1150 }
1151 EXPORT_SYMBOL(tgt_sendpage);
1152
1153 /*
1154  * OBD_IDX_READ handler
1155  */
1156 static int tgt_obd_idx_read(struct tgt_session_info *tsi)
1157 {
1158         struct tgt_thread_info  *tti = tgt_th_info(tsi->tsi_env);
1159         struct lu_rdpg          *rdpg = &tti->tti_u.rdpg.tti_rdpg;
1160         struct idx_info         *req_ii, *rep_ii;
1161         int                      rc, i;
1162
1163         ENTRY;
1164
1165         memset(rdpg, 0, sizeof(*rdpg));
1166         req_capsule_set(tsi->tsi_pill, &RQF_OBD_IDX_READ);
1167
1168         /* extract idx_info buffer from request & reply */
1169         req_ii = req_capsule_client_get(tsi->tsi_pill, &RMF_IDX_INFO);
1170         if (req_ii == NULL || req_ii->ii_magic != IDX_INFO_MAGIC)
1171                 RETURN(err_serious(-EPROTO));
1172
1173         rc = req_capsule_server_pack(tsi->tsi_pill);
1174         if (rc)
1175                 RETURN(err_serious(rc));
1176
1177         rep_ii = req_capsule_server_get(tsi->tsi_pill, &RMF_IDX_INFO);
1178         if (rep_ii == NULL)
1179                 RETURN(err_serious(-EFAULT));
1180         rep_ii->ii_magic = IDX_INFO_MAGIC;
1181
1182         /* extract hash to start with */
1183         rdpg->rp_hash = req_ii->ii_hash_start;
1184
1185         /* extract requested attributes */
1186         rdpg->rp_attrs = req_ii->ii_attrs;
1187
1188         /* check that fid packed in request is valid and supported */
1189         if (!fid_is_sane(&req_ii->ii_fid))
1190                 RETURN(-EINVAL);
1191         rep_ii->ii_fid = req_ii->ii_fid;
1192
1193         /* copy flags */
1194         rep_ii->ii_flags = req_ii->ii_flags;
1195
1196         /* compute number of pages to allocate, ii_count is the number of 4KB
1197          * containers */
1198         if (req_ii->ii_count <= 0)
1199                 GOTO(out, rc = -EFAULT);
1200         rdpg->rp_count = min_t(unsigned int, req_ii->ii_count << LU_PAGE_SHIFT,
1201                                exp_max_brw_size(tsi->tsi_exp));
1202         rdpg->rp_npages = (rdpg->rp_count + PAGE_CACHE_SIZE -1) >> PAGE_CACHE_SHIFT;
1203
1204         /* allocate pages to store the containers */
1205         OBD_ALLOC(rdpg->rp_pages, rdpg->rp_npages * sizeof(rdpg->rp_pages[0]));
1206         if (rdpg->rp_pages == NULL)
1207                 GOTO(out, rc = -ENOMEM);
1208         for (i = 0; i < rdpg->rp_npages; i++) {
1209                 rdpg->rp_pages[i] = alloc_page(GFP_IOFS);
1210                 if (rdpg->rp_pages[i] == NULL)
1211                         GOTO(out, rc = -ENOMEM);
1212         }
1213
1214         /* populate pages with key/record pairs */
1215         rc = dt_index_read(tsi->tsi_env, tsi->tsi_tgt->lut_bottom, rep_ii, rdpg);
1216         if (rc < 0)
1217                 GOTO(out, rc);
1218
1219         LASSERTF(rc <= rdpg->rp_count, "dt_index_read() returned more than "
1220                  "asked %d > %d\n", rc, rdpg->rp_count);
1221
1222         /* send pages to client */
1223         rc = tgt_sendpage(tsi, rdpg, rc);
1224         if (rc)
1225                 GOTO(out, rc);
1226         EXIT;
1227 out:
1228         if (rdpg->rp_pages) {
1229                 for (i = 0; i < rdpg->rp_npages; i++)
1230                         if (rdpg->rp_pages[i])
1231                                 __free_page(rdpg->rp_pages[i]);
1232                 OBD_FREE(rdpg->rp_pages,
1233                          rdpg->rp_npages * sizeof(rdpg->rp_pages[0]));
1234         }
1235         return rc;
1236 }
1237
1238 struct tgt_handler tgt_obd_handlers[] = {
1239 TGT_OBD_HDL    (0,      OBD_PING,               tgt_obd_ping),
1240 TGT_OBD_HDL_VAR(0,      OBD_LOG_CANCEL,         tgt_obd_log_cancel),
1241 TGT_OBD_HDL    (0,      OBD_IDX_READ,           tgt_obd_idx_read)
1242 };
1243 EXPORT_SYMBOL(tgt_obd_handlers);
1244
1245 int tgt_sync(const struct lu_env *env, struct lu_target *tgt,
1246              struct dt_object *obj, __u64 start, __u64 end)
1247 {
1248         int rc = 0;
1249
1250         ENTRY;
1251
1252         /* if no objid is specified, it means "sync whole filesystem" */
1253         if (obj == NULL) {
1254                 rc = dt_sync(env, tgt->lut_bottom);
1255         } else if (dt_version_get(env, obj) >
1256                    tgt->lut_obd->obd_last_committed) {
1257                 rc = dt_object_sync(env, obj, start, end);
1258         }
1259         atomic_inc(&tgt->lut_sync_count);
1260
1261         RETURN(rc);
1262 }
1263 EXPORT_SYMBOL(tgt_sync);
1264 /*
1265  * Unified target DLM handlers.
1266  */
1267
1268 /**
1269  * Unified target BAST
1270  *
1271  * Ensure data and metadata are synced to disk when lock is canceled if Sync on
1272  * Cancel (SOC) is enabled. If it's extent lock, normally sync obj is enough,
1273  * but if it's cross-MDT lock, because remote object version is not set, a
1274  * filesystem sync is needed.
1275  *
1276  * \param lock server side lock
1277  * \param desc lock desc
1278  * \param data ldlm_cb_set_arg
1279  * \param flag  indicates whether this cancelling or blocking callback
1280  * \retval      0 on success
1281  * \retval      negative number on error
1282  */
1283 static int tgt_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
1284                             void *data, int flag)
1285 {
1286         struct lu_env            env;
1287         struct lu_target        *tgt;
1288         struct dt_object        *obj = NULL;
1289         struct lu_fid            fid;
1290         int                      rc = 0;
1291
1292         ENTRY;
1293
1294         tgt = class_exp2tgt(lock->l_export);
1295
1296         if (unlikely(tgt == NULL)) {
1297                 CDEBUG(D_ERROR, "%s: No target for connected export\n",
1298                        class_exp2obd(lock->l_export)->obd_name);
1299                 RETURN(-EINVAL);
1300         }
1301
1302         if (flag == LDLM_CB_CANCELING &&
1303             (lock->l_granted_mode & (LCK_EX | LCK_PW | LCK_GROUP)) &&
1304             (tgt->lut_sync_lock_cancel == ALWAYS_SYNC_ON_CANCEL ||
1305              (tgt->lut_sync_lock_cancel == BLOCKING_SYNC_ON_CANCEL &&
1306               ldlm_is_cbpending(lock))) &&
1307             ((exp_connect_flags(lock->l_export) & OBD_CONNECT_MDS_MDS) ||
1308              lock->l_resource->lr_type == LDLM_EXTENT)) {
1309                 __u64 start = 0;
1310                 __u64 end = OBD_OBJECT_EOF;
1311
1312                 rc = lu_env_init(&env, LCT_DT_THREAD);
1313                 if (unlikely(rc != 0))
1314                         RETURN(rc);
1315
1316                 ost_fid_from_resid(&fid, &lock->l_resource->lr_name,
1317                                    tgt->lut_lsd.lsd_osd_index);
1318
1319                 if (lock->l_resource->lr_type == LDLM_EXTENT) {
1320                         obj = dt_locate(&env, tgt->lut_bottom, &fid);
1321                         if (IS_ERR(obj))
1322                                 GOTO(err_env, rc = PTR_ERR(obj));
1323
1324                         if (!dt_object_exists(obj))
1325                                 GOTO(err_put, rc = -ENOENT);
1326
1327                         start = lock->l_policy_data.l_extent.start;
1328                         end = lock->l_policy_data.l_extent.end;
1329                 }
1330
1331                 rc = tgt_sync(&env, tgt, obj, start, end);
1332                 if (rc < 0) {
1333                         CERROR("%s: syncing "DFID" ("LPU64"-"LPU64") on lock "
1334                                "cancel: rc = %d\n",
1335                                tgt_name(tgt), PFID(&fid),
1336                                lock->l_policy_data.l_extent.start,
1337                                lock->l_policy_data.l_extent.end, rc);
1338                 }
1339 err_put:
1340                 if (obj != NULL)
1341                         lu_object_put(&env, &obj->do_lu);
1342 err_env:
1343                 lu_env_fini(&env);
1344         }
1345
1346         rc = ldlm_server_blocking_ast(lock, desc, data, flag);
1347         RETURN(rc);
1348 }
1349
1350 static struct ldlm_callback_suite tgt_dlm_cbs = {
1351         .lcs_completion = ldlm_server_completion_ast,
1352         .lcs_blocking   = tgt_blocking_ast,
1353         .lcs_glimpse    = ldlm_server_glimpse_ast
1354 };
1355
1356 int tgt_enqueue(struct tgt_session_info *tsi)
1357 {
1358         struct ptlrpc_request *req = tgt_ses_req(tsi);
1359         int rc;
1360
1361         ENTRY;
1362         /*
1363          * tsi->tsi_dlm_req was already swapped and (if necessary) converted,
1364          * tsi->tsi_dlm_cbs was set by the *_req_handle() function.
1365          */
1366         LASSERT(tsi->tsi_dlm_req != NULL);
1367         rc = ldlm_handle_enqueue0(tsi->tsi_exp->exp_obd->obd_namespace, req,
1368                                   tsi->tsi_dlm_req, &tgt_dlm_cbs);
1369         if (rc)
1370                 RETURN(err_serious(rc));
1371
1372         switch (LUT_FAIL_CLASS(tsi->tsi_reply_fail_id)) {
1373         case LUT_FAIL_MDT:
1374                 tsi->tsi_reply_fail_id = OBD_FAIL_MDS_LDLM_REPLY_NET;
1375                 break;
1376         case LUT_FAIL_OST:
1377                 tsi->tsi_reply_fail_id = OBD_FAIL_OST_LDLM_REPLY_NET;
1378                 break;
1379         case LUT_FAIL_MGT:
1380                 tsi->tsi_reply_fail_id = OBD_FAIL_MGS_LDLM_REPLY_NET;
1381                 break;
1382         default:
1383                 tsi->tsi_reply_fail_id = OBD_FAIL_LDLM_REPLY;
1384                 break;
1385         }
1386         RETURN(req->rq_status);
1387 }
1388 EXPORT_SYMBOL(tgt_enqueue);
1389
1390 int tgt_convert(struct tgt_session_info *tsi)
1391 {
1392         struct ptlrpc_request *req = tgt_ses_req(tsi);
1393         int rc;
1394
1395         ENTRY;
1396         LASSERT(tsi->tsi_dlm_req);
1397         rc = ldlm_handle_convert0(req, tsi->tsi_dlm_req);
1398         if (rc)
1399                 RETURN(err_serious(rc));
1400
1401         RETURN(req->rq_status);
1402 }
1403
1404 int tgt_bl_callback(struct tgt_session_info *tsi)
1405 {
1406         return err_serious(-EOPNOTSUPP);
1407 }
1408
1409 int tgt_cp_callback(struct tgt_session_info *tsi)
1410 {
1411         return err_serious(-EOPNOTSUPP);
1412 }
1413
1414 /* generic LDLM target handler */
1415 struct tgt_handler tgt_dlm_handlers[] = {
1416 TGT_DLM_HDL    (HABEO_CLAVIS,   LDLM_ENQUEUE,           tgt_enqueue),
1417 TGT_DLM_HDL_VAR(HABEO_CLAVIS,   LDLM_CONVERT,           tgt_convert),
1418 TGT_DLM_HDL_VAR(0,              LDLM_BL_CALLBACK,       tgt_bl_callback),
1419 TGT_DLM_HDL_VAR(0,              LDLM_CP_CALLBACK,       tgt_cp_callback)
1420 };
1421 EXPORT_SYMBOL(tgt_dlm_handlers);
1422
1423 /*
1424  * Unified target LLOG handlers.
1425  */
1426 int tgt_llog_open(struct tgt_session_info *tsi)
1427 {
1428         int rc;
1429
1430         ENTRY;
1431
1432         rc = llog_origin_handle_open(tgt_ses_req(tsi));
1433
1434         RETURN(rc);
1435 }
1436 EXPORT_SYMBOL(tgt_llog_open);
1437
1438 int tgt_llog_close(struct tgt_session_info *tsi)
1439 {
1440         int rc;
1441
1442         ENTRY;
1443
1444         rc = llog_origin_handle_close(tgt_ses_req(tsi));
1445
1446         RETURN(rc);
1447 }
1448 EXPORT_SYMBOL(tgt_llog_close);
1449
1450
1451 int tgt_llog_destroy(struct tgt_session_info *tsi)
1452 {
1453         int rc;
1454
1455         ENTRY;
1456
1457         rc = llog_origin_handle_destroy(tgt_ses_req(tsi));
1458
1459         RETURN(rc);
1460 }
1461
1462 int tgt_llog_read_header(struct tgt_session_info *tsi)
1463 {
1464         int rc;
1465
1466         ENTRY;
1467
1468         rc = llog_origin_handle_read_header(tgt_ses_req(tsi));
1469
1470         RETURN(rc);
1471 }
1472 EXPORT_SYMBOL(tgt_llog_read_header);
1473
1474 int tgt_llog_next_block(struct tgt_session_info *tsi)
1475 {
1476         int rc;
1477
1478         ENTRY;
1479
1480         rc = llog_origin_handle_next_block(tgt_ses_req(tsi));
1481
1482         RETURN(rc);
1483 }
1484 EXPORT_SYMBOL(tgt_llog_next_block);
1485
1486 int tgt_llog_prev_block(struct tgt_session_info *tsi)
1487 {
1488         int rc;
1489
1490         ENTRY;
1491
1492         rc = llog_origin_handle_prev_block(tgt_ses_req(tsi));
1493
1494         RETURN(rc);
1495 }
1496 EXPORT_SYMBOL(tgt_llog_prev_block);
1497
1498 /* generic llog target handler */
1499 struct tgt_handler tgt_llog_handlers[] = {
1500 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_CREATE,      tgt_llog_open),
1501 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_NEXT_BLOCK,  tgt_llog_next_block),
1502 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_READ_HEADER, tgt_llog_read_header),
1503 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_PREV_BLOCK,  tgt_llog_prev_block),
1504 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_DESTROY,     tgt_llog_destroy),
1505 TGT_LLOG_HDL_VAR(0,     LLOG_ORIGIN_HANDLE_CLOSE,       tgt_llog_close),
1506 };
1507 EXPORT_SYMBOL(tgt_llog_handlers);
1508
1509 /*
1510  * sec context handlers
1511  */
1512 /* XXX: Implement based on mdt_sec_ctx_handle()? */
1513 static int tgt_sec_ctx_handle(struct tgt_session_info *tsi)
1514 {
1515         return 0;
1516 }
1517
1518 struct tgt_handler tgt_sec_ctx_handlers[] = {
1519 TGT_SEC_HDL_VAR(0,      SEC_CTX_INIT,           tgt_sec_ctx_handle),
1520 TGT_SEC_HDL_VAR(0,      SEC_CTX_INIT_CONT,      tgt_sec_ctx_handle),
1521 TGT_SEC_HDL_VAR(0,      SEC_CTX_FINI,           tgt_sec_ctx_handle),
1522 };
1523 EXPORT_SYMBOL(tgt_sec_ctx_handlers);
1524
1525 int (*tgt_lfsck_in_notify)(const struct lu_env *env,
1526                            struct dt_device *key,
1527                            struct lfsck_request *lr,
1528                            struct thandle *th) = NULL;
1529
1530 void tgt_register_lfsck_in_notify(int (*notify)(const struct lu_env *,
1531                                                 struct dt_device *,
1532                                                 struct lfsck_request *,
1533                                                 struct thandle *))
1534 {
1535         tgt_lfsck_in_notify = notify;
1536 }
1537 EXPORT_SYMBOL(tgt_register_lfsck_in_notify);
1538
1539 static int (*tgt_lfsck_query)(const struct lu_env *env,
1540                               struct dt_device *key,
1541                               struct lfsck_request *req,
1542                               struct lfsck_reply *rep,
1543                               struct lfsck_query *que) = NULL;
1544
1545 void tgt_register_lfsck_query(int (*query)(const struct lu_env *,
1546                                            struct dt_device *,
1547                                            struct lfsck_request *,
1548                                            struct lfsck_reply *,
1549                                            struct lfsck_query *))
1550 {
1551         tgt_lfsck_query = query;
1552 }
1553 EXPORT_SYMBOL(tgt_register_lfsck_query);
1554
1555 /* LFSCK request handlers */
1556 static int tgt_handle_lfsck_notify(struct tgt_session_info *tsi)
1557 {
1558         const struct lu_env     *env = tsi->tsi_env;
1559         struct dt_device        *key = tsi->tsi_tgt->lut_bottom;
1560         struct lfsck_request    *lr;
1561         int                      rc;
1562         ENTRY;
1563
1564         lr = req_capsule_client_get(tsi->tsi_pill, &RMF_LFSCK_REQUEST);
1565         if (lr == NULL)
1566                 RETURN(-EPROTO);
1567
1568         rc = tgt_lfsck_in_notify(env, key, lr, NULL);
1569
1570         RETURN(rc);
1571 }
1572
1573 static int tgt_handle_lfsck_query(struct tgt_session_info *tsi)
1574 {
1575         struct lfsck_request    *request;
1576         struct lfsck_reply      *reply;
1577         int                      rc;
1578         ENTRY;
1579
1580         request = req_capsule_client_get(tsi->tsi_pill, &RMF_LFSCK_REQUEST);
1581         if (request == NULL)
1582                 RETURN(-EPROTO);
1583
1584         reply = req_capsule_server_get(tsi->tsi_pill, &RMF_LFSCK_REPLY);
1585         if (reply == NULL)
1586                 RETURN(-ENOMEM);
1587
1588         rc = tgt_lfsck_query(tsi->tsi_env, tsi->tsi_tgt->lut_bottom,
1589                              request, reply, NULL);
1590
1591         RETURN(rc < 0 ? rc : 0);
1592 }
1593
1594 struct tgt_handler tgt_lfsck_handlers[] = {
1595 TGT_LFSCK_HDL(HABEO_REFERO,     LFSCK_NOTIFY,   tgt_handle_lfsck_notify),
1596 TGT_LFSCK_HDL(HABEO_REFERO,     LFSCK_QUERY,    tgt_handle_lfsck_query),
1597 };
1598 EXPORT_SYMBOL(tgt_lfsck_handlers);
1599
1600 /*
1601  * initialize per-thread page pool (bug 5137).
1602  */
1603 int tgt_io_thread_init(struct ptlrpc_thread *thread)
1604 {
1605         struct tgt_thread_big_cache *tbc;
1606
1607         ENTRY;
1608
1609         LASSERT(thread != NULL);
1610         LASSERT(thread->t_data == NULL);
1611
1612         OBD_ALLOC_LARGE(tbc, sizeof(*tbc));
1613         if (tbc == NULL)
1614                 RETURN(-ENOMEM);
1615         thread->t_data = tbc;
1616         RETURN(0);
1617 }
1618 EXPORT_SYMBOL(tgt_io_thread_init);
1619
1620 /*
1621  * free per-thread pool created by tgt_thread_init().
1622  */
1623 void tgt_io_thread_done(struct ptlrpc_thread *thread)
1624 {
1625         struct tgt_thread_big_cache *tbc;
1626
1627         ENTRY;
1628
1629         LASSERT(thread != NULL);
1630
1631         /*
1632          * be prepared to handle partially-initialized pools (because this is
1633          * called from ost_io_thread_init() for cleanup.
1634          */
1635         tbc = thread->t_data;
1636         if (tbc != NULL) {
1637                 OBD_FREE_LARGE(tbc, sizeof(*tbc));
1638                 thread->t_data = NULL;
1639         }
1640         EXIT;
1641 }
1642 EXPORT_SYMBOL(tgt_io_thread_done);
1643 /**
1644  * Helper function for getting server side [start, start+count] DLM lock
1645  * if asked by client.
1646  */
1647 int tgt_extent_lock(struct ldlm_namespace *ns, struct ldlm_res_id *res_id,
1648                     __u64 start, __u64 end, struct lustre_handle *lh,
1649                     int mode, __u64 *flags)
1650 {
1651         union ldlm_policy_data policy;
1652         int rc;
1653
1654         ENTRY;
1655
1656         LASSERT(lh != NULL);
1657         LASSERT(ns != NULL);
1658         LASSERT(!lustre_handle_is_used(lh));
1659
1660         policy.l_extent.gid = 0;
1661         policy.l_extent.start = start & PAGE_MASK;
1662
1663         /*
1664          * If ->o_blocks is EOF it means "lock till the end of the file".
1665          * Otherwise, it's size of an extent or hole being punched (in bytes).
1666          */
1667         if (end == OBD_OBJECT_EOF || end < start)
1668                 policy.l_extent.end = OBD_OBJECT_EOF;
1669         else
1670                 policy.l_extent.end = end | ~PAGE_MASK;
1671
1672         rc = ldlm_cli_enqueue_local(ns, res_id, LDLM_EXTENT, &policy, mode,
1673                                     flags, ldlm_blocking_ast,
1674                                     ldlm_completion_ast, ldlm_glimpse_ast,
1675                                     NULL, 0, LVB_T_NONE, NULL, lh);
1676         RETURN(rc == ELDLM_OK ? 0 : -EIO);
1677 }
1678 EXPORT_SYMBOL(tgt_extent_lock);
1679
1680 void tgt_extent_unlock(struct lustre_handle *lh, enum ldlm_mode mode)
1681 {
1682         LASSERT(lustre_handle_is_used(lh));
1683         ldlm_lock_decref(lh, mode);
1684 }
1685 EXPORT_SYMBOL(tgt_extent_unlock);
1686
1687 int tgt_brw_lock(struct ldlm_namespace *ns, struct ldlm_res_id *res_id,
1688                  struct obd_ioobj *obj, struct niobuf_remote *nb,
1689                  struct lustre_handle *lh, enum ldlm_mode mode)
1690 {
1691         __u64                    flags = 0;
1692         int                      nrbufs = obj->ioo_bufcnt;
1693         int                      i;
1694
1695         ENTRY;
1696
1697         LASSERT(mode == LCK_PR || mode == LCK_PW);
1698         LASSERT(!lustre_handle_is_used(lh));
1699
1700         if (nrbufs == 0 || !(nb[0].rnb_flags & OBD_BRW_SRVLOCK))
1701                 RETURN(0);
1702
1703         for (i = 1; i < nrbufs; i++)
1704                 if (!(nb[i].rnb_flags & OBD_BRW_SRVLOCK))
1705                         RETURN(-EFAULT);
1706
1707         RETURN(tgt_extent_lock(ns, res_id, nb[0].rnb_offset,
1708                                nb[nrbufs - 1].rnb_offset +
1709                                nb[nrbufs - 1].rnb_len - 1,
1710                                lh, mode, &flags));
1711 }
1712
1713 void tgt_brw_unlock(struct obd_ioobj *obj, struct niobuf_remote *niob,
1714                     struct lustre_handle *lh, enum ldlm_mode mode)
1715 {
1716         ENTRY;
1717
1718         LASSERT(mode == LCK_PR || mode == LCK_PW);
1719         LASSERT((obj->ioo_bufcnt > 0 &&
1720                  (niob[0].rnb_flags & OBD_BRW_SRVLOCK)) ==
1721                 lustre_handle_is_used(lh));
1722
1723         if (lustre_handle_is_used(lh))
1724                 tgt_extent_unlock(lh, mode);
1725         EXIT;
1726 }
1727
1728 static __u32 tgt_checksum_bulk(struct lu_target *tgt,
1729                                struct ptlrpc_bulk_desc *desc, int opc,
1730                                cksum_type_t cksum_type)
1731 {
1732         struct cfs_crypto_hash_desc     *hdesc;
1733         unsigned int                    bufsize;
1734         int                             i, err;
1735         unsigned char                   cfs_alg = cksum_obd2cfs(cksum_type);
1736         __u32                           cksum;
1737
1738         LASSERT(ptlrpc_is_bulk_desc_kiov(desc->bd_type));
1739
1740         hdesc = cfs_crypto_hash_init(cfs_alg, NULL, 0);
1741         if (IS_ERR(hdesc)) {
1742                 CERROR("%s: unable to initialize checksum hash %s\n",
1743                        tgt_name(tgt), cfs_crypto_hash_name(cfs_alg));
1744                 return PTR_ERR(hdesc);
1745         }
1746
1747         CDEBUG(D_INFO, "Checksum for algo %s\n", cfs_crypto_hash_name(cfs_alg));
1748         for (i = 0; i < desc->bd_iov_count; i++) {
1749                 /* corrupt the data before we compute the checksum, to
1750                  * simulate a client->OST data error */
1751                 if (i == 0 && opc == OST_WRITE &&
1752                     OBD_FAIL_CHECK(OBD_FAIL_OST_CHECKSUM_RECEIVE)) {
1753                         int off = BD_GET_KIOV(desc, i).kiov_offset &
1754                                 ~PAGE_MASK;
1755                         int len = BD_GET_KIOV(desc, i).kiov_len;
1756                         struct page *np = tgt_page_to_corrupt;
1757                         char *ptr = kmap(BD_GET_KIOV(desc, i).kiov_page) + off;
1758
1759                         if (np) {
1760                                 char *ptr2 = kmap(np) + off;
1761
1762                                 memcpy(ptr2, ptr, len);
1763                                 memcpy(ptr2, "bad3", min(4, len));
1764                                 kunmap(np);
1765                                 BD_GET_KIOV(desc, i).kiov_page = np;
1766                         } else {
1767                                 CERROR("%s: can't alloc page for corruption\n",
1768                                        tgt_name(tgt));
1769                         }
1770                 }
1771                 cfs_crypto_hash_update_page(hdesc,
1772                                   BD_GET_KIOV(desc, i).kiov_page,
1773                                   BD_GET_KIOV(desc, i).kiov_offset &
1774                                         ~PAGE_MASK,
1775                                   BD_GET_KIOV(desc, i).kiov_len);
1776
1777                  /* corrupt the data after we compute the checksum, to
1778                  * simulate an OST->client data error */
1779                 if (i == 0 && opc == OST_READ &&
1780                     OBD_FAIL_CHECK(OBD_FAIL_OST_CHECKSUM_SEND)) {
1781                         int off = BD_GET_KIOV(desc, i).kiov_offset
1782                           & ~PAGE_MASK;
1783                         int len = BD_GET_KIOV(desc, i).kiov_len;
1784                         struct page *np = tgt_page_to_corrupt;
1785                         char *ptr =
1786                           kmap(BD_GET_KIOV(desc, i).kiov_page) + off;
1787
1788                         if (np) {
1789                                 char *ptr2 = kmap(np) + off;
1790
1791                                 memcpy(ptr2, ptr, len);
1792                                 memcpy(ptr2, "bad4", min(4, len));
1793                                 kunmap(np);
1794                                 BD_GET_KIOV(desc, i).kiov_page = np;
1795                         } else {
1796                                 CERROR("%s: can't alloc page for corruption\n",
1797                                        tgt_name(tgt));
1798                         }
1799                 }
1800         }
1801
1802         bufsize = sizeof(cksum);
1803         err = cfs_crypto_hash_final(hdesc, (unsigned char *)&cksum, &bufsize);
1804
1805         return cksum;
1806 }
1807
1808 int tgt_brw_read(struct tgt_session_info *tsi)
1809 {
1810         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1811         struct ptlrpc_bulk_desc *desc = NULL;
1812         struct obd_export       *exp = tsi->tsi_exp;
1813         struct niobuf_remote    *remote_nb;
1814         struct niobuf_local     *local_nb;
1815         struct obd_ioobj        *ioo;
1816         struct ost_body         *body, *repbody;
1817         struct l_wait_info       lwi;
1818         struct lustre_handle     lockh = { 0 };
1819         int                      npages, nob = 0, rc, i, no_reply = 0;
1820         struct tgt_thread_big_cache *tbc = req->rq_svc_thread->t_data;
1821
1822         ENTRY;
1823
1824         if (ptlrpc_req2svc(req)->srv_req_portal != OST_IO_PORTAL) {
1825                 CERROR("%s: deny read request from %s to portal %u\n",
1826                        tgt_name(tsi->tsi_tgt),
1827                        obd_export_nid2str(req->rq_export),
1828                        ptlrpc_req2svc(req)->srv_req_portal);
1829                 RETURN(-EPROTO);
1830         }
1831
1832         req->rq_bulk_read = 1;
1833
1834         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_READ_BULK))
1835                 RETURN(-EIO);
1836
1837         OBD_FAIL_TIMEOUT(OBD_FAIL_OST_BRW_PAUSE_BULK, cfs_fail_val > 0 ?
1838                          cfs_fail_val : (obd_timeout + 1) / 4);
1839
1840         /* Check if there is eviction in progress, and if so, wait for it to
1841          * finish */
1842         if (unlikely(atomic_read(&exp->exp_obd->obd_evict_inprogress))) {
1843                 /* We do not care how long it takes */
1844                 lwi = LWI_INTR(NULL, NULL);
1845                 rc = l_wait_event(exp->exp_obd->obd_evict_inprogress_waitq,
1846                          !atomic_read(&exp->exp_obd->obd_evict_inprogress),
1847                          &lwi);
1848         }
1849
1850         /* There must be big cache in current thread to process this request
1851          * if it is NULL then something went wrong and it wasn't allocated,
1852          * report -ENOMEM in that case */
1853         if (tbc == NULL)
1854                 RETURN(-ENOMEM);
1855
1856         body = tsi->tsi_ost_body;
1857         LASSERT(body != NULL);
1858
1859         ioo = req_capsule_client_get(tsi->tsi_pill, &RMF_OBD_IOOBJ);
1860         LASSERT(ioo != NULL); /* must exists after tgt_ost_body_unpack */
1861
1862         remote_nb = req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE);
1863         LASSERT(remote_nb != NULL); /* must exists after tgt_ost_body_unpack */
1864
1865         local_nb = tbc->local;
1866
1867         rc = tgt_brw_lock(exp->exp_obd->obd_namespace, &tsi->tsi_resid, ioo,
1868                           remote_nb, &lockh, LCK_PR);
1869         if (rc != 0)
1870                 RETURN(rc);
1871
1872         /*
1873          * If getting the lock took more time than
1874          * client was willing to wait, drop it. b=11330
1875          */
1876         if (cfs_time_current_sec() > req->rq_deadline ||
1877             OBD_FAIL_CHECK(OBD_FAIL_OST_DROP_REQ)) {
1878                 no_reply = 1;
1879                 CERROR("Dropping timed-out read from %s because locking"
1880                        "object "DOSTID" took %ld seconds (limit was %ld).\n",
1881                        libcfs_id2str(req->rq_peer), POSTID(&ioo->ioo_oid),
1882                        cfs_time_current_sec() - req->rq_arrival_time.tv_sec,
1883                        req->rq_deadline - req->rq_arrival_time.tv_sec);
1884                 GOTO(out_lock, rc = -ETIMEDOUT);
1885         }
1886
1887         repbody = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
1888         repbody->oa = body->oa;
1889
1890         npages = PTLRPC_MAX_BRW_PAGES;
1891         rc = obd_preprw(tsi->tsi_env, OBD_BRW_READ, exp, &repbody->oa, 1,
1892                         ioo, remote_nb, &npages, local_nb);
1893         if (rc != 0)
1894                 GOTO(out_lock, rc);
1895
1896         desc = ptlrpc_prep_bulk_exp(req, npages, ioobj_max_brw_get(ioo),
1897                                     PTLRPC_BULK_PUT_SOURCE |
1898                                         PTLRPC_BULK_BUF_KIOV,
1899                                     OST_BULK_PORTAL,
1900                                     &ptlrpc_bulk_kiov_nopin_ops);
1901         if (desc == NULL)
1902                 GOTO(out_commitrw, rc = -ENOMEM);
1903
1904         nob = 0;
1905         for (i = 0; i < npages; i++) {
1906                 int page_rc = local_nb[i].lnb_rc;
1907
1908                 if (page_rc < 0) {
1909                         rc = page_rc;
1910                         break;
1911                 }
1912
1913                 nob += page_rc;
1914                 if (page_rc != 0) { /* some data! */
1915                         LASSERT(local_nb[i].lnb_page != NULL);
1916                         desc->bd_frag_ops->add_kiov_frag
1917                           (desc, local_nb[i].lnb_page,
1918                            local_nb[i].lnb_page_offset,
1919                            page_rc);
1920                 }
1921
1922                 if (page_rc != local_nb[i].lnb_len) { /* short read */
1923                         /* All subsequent pages should be 0 */
1924                         while (++i < npages)
1925                                 LASSERT(local_nb[i].lnb_rc == 0);
1926                         break;
1927                 }
1928         }
1929         if (OBD_FAIL_CHECK(OBD_FAIL_OST_READ_SIZE) &&
1930             nob != cfs_fail_val)
1931                 rc = -E2BIG;
1932
1933         if (body->oa.o_valid & OBD_MD_FLCKSUM) {
1934                 cksum_type_t cksum_type =
1935                         cksum_type_unpack(body->oa.o_valid & OBD_MD_FLFLAGS ?
1936                                           body->oa.o_flags : 0);
1937                 repbody->oa.o_flags = cksum_type_pack(cksum_type);
1938                 repbody->oa.o_valid = OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1939                 repbody->oa.o_cksum = tgt_checksum_bulk(tsi->tsi_tgt, desc,
1940                                                         OST_READ, cksum_type);
1941                 CDEBUG(D_PAGE, "checksum at read origin: %x\n",
1942                        repbody->oa.o_cksum);
1943         } else {
1944                 repbody->oa.o_valid = 0;
1945         }
1946         /* We're finishing using body->oa as an input variable */
1947
1948         /* Check if client was evicted while we were doing i/o before touching
1949          * network */
1950         if (likely(rc == 0 &&
1951                    !CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2) &&
1952                    !CFS_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_BULK))) {
1953                 rc = target_bulk_io(exp, desc, &lwi);
1954                 no_reply = rc != 0;
1955         }
1956
1957 out_commitrw:
1958         /* Must commit after prep above in all cases */
1959         rc = obd_commitrw(tsi->tsi_env, OBD_BRW_READ, exp, &repbody->oa, 1, ioo,
1960                           remote_nb, npages, local_nb, rc);
1961 out_lock:
1962         tgt_brw_unlock(ioo, remote_nb, &lockh, LCK_PR);
1963
1964         if (desc && !CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2))
1965                 ptlrpc_free_bulk(desc);
1966
1967         LASSERT(rc <= 0);
1968         if (rc == 0) {
1969                 rc = nob;
1970                 ptlrpc_lprocfs_brw(req, nob);
1971         } else if (no_reply) {
1972                 req->rq_no_reply = 1;
1973                 /* reply out callback would free */
1974                 ptlrpc_req_drop_rs(req);
1975                 LCONSOLE_WARN("%s: Bulk IO read error with %s (at %s), "
1976                               "client will retry: rc %d\n",
1977                               exp->exp_obd->obd_name,
1978                               obd_uuid2str(&exp->exp_client_uuid),
1979                               obd_export_nid2str(exp), rc);
1980         }
1981         /* send a bulk after reply to simulate a network delay or reordering
1982          * by a router */
1983         if (unlikely(CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2))) {
1984                 wait_queue_head_t        waitq;
1985                 struct l_wait_info       lwi1;
1986
1987                 CDEBUG(D_INFO, "reorder BULK\n");
1988                 init_waitqueue_head(&waitq);
1989
1990                 lwi1 = LWI_TIMEOUT_INTR(cfs_time_seconds(3), NULL, NULL, NULL);
1991                 l_wait_event(waitq, 0, &lwi1);
1992                 target_bulk_io(exp, desc, &lwi);
1993                 ptlrpc_free_bulk(desc);
1994         }
1995
1996         RETURN(rc);
1997 }
1998 EXPORT_SYMBOL(tgt_brw_read);
1999
2000 static void tgt_warn_on_cksum(struct ptlrpc_request *req,
2001                               struct ptlrpc_bulk_desc *desc,
2002                               struct niobuf_local *local_nb, int npages,
2003                               u32 client_cksum, u32 server_cksum,
2004                               bool mmap)
2005 {
2006         struct obd_export *exp = req->rq_export;
2007         struct ost_body *body;
2008         char *router = "";
2009         char *via = "";
2010
2011         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
2012         LASSERT(body != NULL);
2013
2014         if (req->rq_peer.nid != desc->bd_sender) {
2015                 via = " via ";
2016                 router = libcfs_nid2str(desc->bd_sender);
2017         }
2018
2019         if (mmap) {
2020                 CDEBUG_LIMIT(D_INFO, "client csum %x, server csum %x\n",
2021                              client_cksum, server_cksum);
2022                 return;
2023         }
2024
2025         LCONSOLE_ERROR_MSG(0x168, "BAD WRITE CHECKSUM: %s from %s%s%s inode "
2026                            DFID" object "DOSTID" extent ["LPU64"-"LPU64
2027                            "]: client csum %x, server csum %x\n",
2028                            exp->exp_obd->obd_name, libcfs_id2str(req->rq_peer),
2029                            via, router,
2030                            body->oa.o_valid & OBD_MD_FLFID ?
2031                            body->oa.o_parent_seq : (__u64)0,
2032                            body->oa.o_valid & OBD_MD_FLFID ?
2033                            body->oa.o_parent_oid : 0,
2034                            body->oa.o_valid & OBD_MD_FLFID ?
2035                            body->oa.o_parent_ver : 0,
2036                            POSTID(&body->oa.o_oi),
2037                            local_nb[0].lnb_file_offset,
2038                            local_nb[npages-1].lnb_file_offset +
2039                            local_nb[npages - 1].lnb_len - 1,
2040                            client_cksum, server_cksum);
2041 }
2042
2043 int tgt_brw_write(struct tgt_session_info *tsi)
2044 {
2045         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2046         struct ptlrpc_bulk_desc *desc = NULL;
2047         struct obd_export       *exp = req->rq_export;
2048         struct niobuf_remote    *remote_nb;
2049         struct niobuf_local     *local_nb;
2050         struct obd_ioobj        *ioo;
2051         struct ost_body         *body, *repbody;
2052         struct l_wait_info       lwi;
2053         struct lustre_handle     lockh = {0};
2054         __u32                   *rcs;
2055         int                      objcount, niocount, npages;
2056         int                      rc, i, j;
2057         cksum_type_t             cksum_type = OBD_CKSUM_CRC32;
2058         bool                     no_reply = false, mmap;
2059         struct tgt_thread_big_cache *tbc = req->rq_svc_thread->t_data;
2060
2061         ENTRY;
2062
2063         if (ptlrpc_req2svc(req)->srv_req_portal != OST_IO_PORTAL) {
2064                 CERROR("%s: deny write request from %s to portal %u\n",
2065                        tgt_name(tsi->tsi_tgt),
2066                        obd_export_nid2str(req->rq_export),
2067                        ptlrpc_req2svc(req)->srv_req_portal);
2068                 RETURN(err_serious(-EPROTO));
2069         }
2070
2071         if (OBD_FAIL_CHECK(OBD_FAIL_OST_ENOSPC))
2072                 RETURN(err_serious(-ENOSPC));
2073         if (OBD_FAIL_TIMEOUT(OBD_FAIL_OST_EROFS, 1))
2074                 RETURN(err_serious(-EROFS));
2075
2076         req->rq_bulk_write = 1;
2077
2078         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_WRITE_BULK))
2079                 RETURN(err_serious(-EIO));
2080         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_WRITE_BULK2))
2081                 RETURN(err_serious(-EFAULT));
2082
2083         /* pause before transaction has been started */
2084         CFS_FAIL_TIMEOUT(OBD_FAIL_OST_BRW_PAUSE_BULK, cfs_fail_val > 0 ?
2085                          cfs_fail_val : (obd_timeout + 1) / 4);
2086
2087         /* There must be big cache in current thread to process this request
2088          * if it is NULL then something went wrong and it wasn't allocated,
2089          * report -ENOMEM in that case */
2090         if (tbc == NULL)
2091                 RETURN(-ENOMEM);
2092
2093         body = tsi->tsi_ost_body;
2094         LASSERT(body != NULL);
2095
2096         ioo = req_capsule_client_get(&req->rq_pill, &RMF_OBD_IOOBJ);
2097         LASSERT(ioo != NULL); /* must exists after tgt_ost_body_unpack */
2098
2099         objcount = req_capsule_get_size(&req->rq_pill, &RMF_OBD_IOOBJ,
2100                                         RCL_CLIENT) / sizeof(*ioo);
2101
2102         for (niocount = i = 0; i < objcount; i++)
2103                 niocount += ioo[i].ioo_bufcnt;
2104
2105         remote_nb = req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE);
2106         LASSERT(remote_nb != NULL); /* must exists after tgt_ost_body_unpack */
2107         if (niocount != req_capsule_get_size(&req->rq_pill,
2108                                              &RMF_NIOBUF_REMOTE, RCL_CLIENT) /
2109                         sizeof(*remote_nb))
2110                 RETURN(err_serious(-EPROTO));
2111
2112         if ((remote_nb[0].rnb_flags & OBD_BRW_MEMALLOC) &&
2113             (exp->exp_connection->c_peer.nid == exp->exp_connection->c_self))
2114                 memory_pressure_set();
2115
2116         req_capsule_set_size(&req->rq_pill, &RMF_RCS, RCL_SERVER,
2117                              niocount * sizeof(*rcs));
2118         rc = req_capsule_server_pack(&req->rq_pill);
2119         if (rc != 0)
2120                 GOTO(out, rc = err_serious(rc));
2121
2122         CFS_FAIL_TIMEOUT(OBD_FAIL_OST_BRW_PAUSE_PACK, cfs_fail_val);
2123         rcs = req_capsule_server_get(&req->rq_pill, &RMF_RCS);
2124
2125         local_nb = tbc->local;
2126
2127         rc = tgt_brw_lock(exp->exp_obd->obd_namespace, &tsi->tsi_resid, ioo,
2128                           remote_nb, &lockh, LCK_PW);
2129         if (rc != 0)
2130                 GOTO(out, rc);
2131
2132         /*
2133          * If getting the lock took more time than
2134          * client was willing to wait, drop it. b=11330
2135          */
2136         if (cfs_time_current_sec() > req->rq_deadline ||
2137             OBD_FAIL_CHECK(OBD_FAIL_OST_DROP_REQ)) {
2138                 no_reply = true;
2139                 CERROR("%s: Dropping timed-out write from %s because locking "
2140                        "object "DOSTID" took %ld seconds (limit was %ld).\n",
2141                        tgt_name(tsi->tsi_tgt), libcfs_id2str(req->rq_peer),
2142                        POSTID(&ioo->ioo_oid),
2143                        cfs_time_current_sec() - req->rq_arrival_time.tv_sec,
2144                        req->rq_deadline - req->rq_arrival_time.tv_sec);
2145                 GOTO(out_lock, rc = -ETIMEDOUT);
2146         }
2147
2148         /* Because we already sync grant info with client when reconnect,
2149          * grant info will be cleared for resent req, then fed_grant and
2150          * total_grant will not be modified in following preprw_write */
2151         if (lustre_msg_get_flags(req->rq_reqmsg) & (MSG_RESENT | MSG_REPLAY)) {
2152                 DEBUG_REQ(D_CACHE, req, "clear resent/replay req grant info");
2153                 body->oa.o_valid &= ~OBD_MD_FLGRANT;
2154         }
2155
2156         repbody = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
2157         if (repbody == NULL)
2158                 GOTO(out_lock, rc = -ENOMEM);
2159         repbody->oa = body->oa;
2160
2161         npages = PTLRPC_MAX_BRW_PAGES;
2162         rc = obd_preprw(tsi->tsi_env, OBD_BRW_WRITE, exp, &repbody->oa,
2163                         objcount, ioo, remote_nb, &npages, local_nb);
2164         if (rc < 0)
2165                 GOTO(out_lock, rc);
2166
2167         desc = ptlrpc_prep_bulk_exp(req, npages, ioobj_max_brw_get(ioo),
2168                                     PTLRPC_BULK_GET_SINK | PTLRPC_BULK_BUF_KIOV,
2169                                     OST_BULK_PORTAL,
2170                                     &ptlrpc_bulk_kiov_nopin_ops);
2171         if (desc == NULL)
2172                 GOTO(skip_transfer, rc = -ENOMEM);
2173
2174         /* NB Having prepped, we must commit... */
2175         for (i = 0; i < npages; i++)
2176                 desc->bd_frag_ops->add_kiov_frag(desc,
2177                                                  local_nb[i].lnb_page,
2178                                                  local_nb[i].lnb_page_offset,
2179                                                  local_nb[i].lnb_len);
2180
2181         rc = sptlrpc_svc_prep_bulk(req, desc);
2182         if (rc != 0)
2183                 GOTO(skip_transfer, rc);
2184
2185         rc = target_bulk_io(exp, desc, &lwi);
2186         no_reply = rc != 0;
2187
2188 skip_transfer:
2189         if (body->oa.o_valid & OBD_MD_FLCKSUM && rc == 0) {
2190                 static int cksum_counter;
2191
2192                 if (body->oa.o_valid & OBD_MD_FLFLAGS)
2193                         cksum_type = cksum_type_unpack(body->oa.o_flags);
2194
2195                 repbody->oa.o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
2196                 repbody->oa.o_flags &= ~OBD_FL_CKSUM_ALL;
2197                 repbody->oa.o_flags |= cksum_type_pack(cksum_type);
2198                 repbody->oa.o_cksum = tgt_checksum_bulk(tsi->tsi_tgt, desc,
2199                                                         OST_WRITE, cksum_type);
2200                 cksum_counter++;
2201
2202                 if (unlikely(body->oa.o_cksum != repbody->oa.o_cksum)) {
2203                         mmap = (body->oa.o_valid & OBD_MD_FLFLAGS &&
2204                                 body->oa.o_flags & OBD_FL_MMAP);
2205
2206                         tgt_warn_on_cksum(req, desc, local_nb, npages,
2207                                           body->oa.o_cksum,
2208                                           repbody->oa.o_cksum, mmap);
2209                         cksum_counter = 0;
2210                 } else if ((cksum_counter & (-cksum_counter)) ==
2211                            cksum_counter) {
2212                         CDEBUG(D_INFO, "Checksum %u from %s OK: %x\n",
2213                                cksum_counter, libcfs_id2str(req->rq_peer),
2214                                repbody->oa.o_cksum);
2215                 }
2216         }
2217
2218         /* Must commit after prep above in all cases */
2219         rc = obd_commitrw(tsi->tsi_env, OBD_BRW_WRITE, exp, &repbody->oa,
2220                           objcount, ioo, remote_nb, npages, local_nb, rc);
2221         if (rc == -ENOTCONN)
2222                 /* quota acquire process has been given up because
2223                  * either the client has been evicted or the client
2224                  * has timed out the request already */
2225                 no_reply = true;
2226
2227         /*
2228          * Disable sending mtime back to the client. If the client locked the
2229          * whole object, then it has already updated the mtime on its side,
2230          * otherwise it will have to glimpse anyway (see bug 21489, comment 32)
2231          */
2232         repbody->oa.o_valid &= ~(OBD_MD_FLMTIME | OBD_MD_FLATIME);
2233
2234         if (rc == 0) {
2235                 int nob = 0;
2236
2237                 /* set per-requested niobuf return codes */
2238                 for (i = j = 0; i < niocount; i++) {
2239                         int len = remote_nb[i].rnb_len;
2240
2241                         nob += len;
2242                         rcs[i] = 0;
2243                         do {
2244                                 LASSERT(j < npages);
2245                                 if (local_nb[j].lnb_rc < 0)
2246                                         rcs[i] = local_nb[j].lnb_rc;
2247                                 len -= local_nb[j].lnb_len;
2248                                 j++;
2249                         } while (len > 0);
2250                         LASSERT(len == 0);
2251                 }
2252                 LASSERT(j == npages);
2253                 ptlrpc_lprocfs_brw(req, nob);
2254         }
2255 out_lock:
2256         tgt_brw_unlock(ioo, remote_nb, &lockh, LCK_PW);
2257         if (desc)
2258                 ptlrpc_free_bulk(desc);
2259 out:
2260         if (no_reply) {
2261                 req->rq_no_reply = 1;
2262                 /* reply out callback would free */
2263                 ptlrpc_req_drop_rs(req);
2264                 LCONSOLE_WARN("%s: Bulk IO write error with %s (at %s), "
2265                               "client will retry: rc %d\n",
2266                               exp->exp_obd->obd_name,
2267                               obd_uuid2str(&exp->exp_client_uuid),
2268                               obd_export_nid2str(exp), rc);
2269         }
2270         memory_pressure_clr();
2271         RETURN(rc);
2272 }
2273 EXPORT_SYMBOL(tgt_brw_write);
2274
2275 /* Check if request can be reconstructed from saved reply data
2276  * A copy of the reply data is returned in @trd if the pointer is not NULL
2277  */
2278 bool req_can_reconstruct(struct ptlrpc_request *req,
2279                          struct tg_reply_data *trd)
2280 {
2281         struct tg_export_data *ted = &req->rq_export->exp_target_data;
2282         struct lsd_client_data *lcd = ted->ted_lcd;
2283         bool found;
2284
2285         if (tgt_is_multimodrpcs_client(req->rq_export))
2286                 return tgt_lookup_reply(req, trd);
2287
2288         mutex_lock(&ted->ted_lcd_lock);
2289         found = req->rq_xid == lcd->lcd_last_xid ||
2290                 req->rq_xid == lcd->lcd_last_close_xid;
2291
2292         if (found && trd != NULL) {
2293                 if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE) {
2294                         trd->trd_reply.lrd_xid = lcd->lcd_last_close_xid;
2295                         trd->trd_reply.lrd_transno =
2296                                                 lcd->lcd_last_close_transno;
2297                         trd->trd_reply.lrd_result = lcd->lcd_last_close_result;
2298                 } else {
2299                         trd->trd_reply.lrd_xid = lcd->lcd_last_xid;
2300                         trd->trd_reply.lrd_transno = lcd->lcd_last_transno;
2301                         trd->trd_reply.lrd_result = lcd->lcd_last_result;
2302                         trd->trd_reply.lrd_data = lcd->lcd_last_data;
2303                         trd->trd_pre_versions[0] = lcd->lcd_pre_versions[0];
2304                         trd->trd_pre_versions[1] = lcd->lcd_pre_versions[1];
2305                         trd->trd_pre_versions[2] = lcd->lcd_pre_versions[2];
2306                         trd->trd_pre_versions[3] = lcd->lcd_pre_versions[3];
2307                 }
2308         }
2309         mutex_unlock(&ted->ted_lcd_lock);
2310
2311         return found;
2312 }
2313 EXPORT_SYMBOL(req_can_reconstruct);
2314