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 = tsi->tsi_exp->exp_target_data.ted_nodemap;
 259
 260         body->oa.o_uid = nodemap_map_id(nodemap, NODEMAP_UID,
 261                                         NODEMAP_CLIENT_TO_FS,
 262                                         body->oa.o_uid);
 263         body->oa.o_gid = nodemap_map_id(nodemap, NODEMAP_GID,
 264                                         NODEMAP_CLIENT_TO_FS,
 265                                         body->oa.o_gid);
 266
 267         tsi->tsi_ost_body = body;
 268         tsi->tsi_fid = body->oa.o_oi.oi_fid;
 269
 270         if (req_capsule_has_field(pill, &RMF_OBD_IOOBJ, RCL_CLIENT)) {
 271                 rc = tgt_io_data_unpack(tsi, &body->oa.o_oi);
 272                 if (rc < 0)
 273                         RETURN(rc);
 274         }
 275
 276         if (!(body->oa.o_valid & OBD_MD_FLID)) {
 277                 if (flags & HABEO_CORPUS) {
 278                         CERROR("%s: OBD_MD_FLID flag is not set in ost_body "
 279                                "but OID/FID is mandatory with HABEO_CORPUS\n",
 280                                tgt_name(tsi->tsi_tgt));
 281                         RETURN(-EPROTO);
 282                 } else {
 283                         RETURN(0);
 284                 }
 285         }
 286
 287         ost_fid_build_resid(&tsi->tsi_fid, &tsi->tsi_resid);
 288
 289         /*
 290          * OST doesn't get object in advance for further use to prevent
 291          * situations with nested object_find which is potential deadlock.
 292          */
 293         tsi->tsi_corpus = NULL;
 294         RETURN(rc);
 295 }
 296
 297 /*
 298  * Do necessary preprocessing according to handler ->th_flags.
 299  */
 300 static int tgt_request_preprocess(struct tgt_session_info *tsi,
 301                                   struct tgt_handler *h,
 302                                   struct ptlrpc_request *req)
 303 {
 304         struct req_capsule      *pill = tsi->tsi_pill;
 305         __u32                    flags = h->th_flags;
 306         int                      rc = 0;
 307
 308         ENTRY;
 309
 310         if (tsi->tsi_preprocessed)
 311                 RETURN(0);
 312
 313         LASSERT(h->th_act != NULL);
 314         LASSERT(h->th_opc == lustre_msg_get_opc(req->rq_reqmsg));
 315         LASSERT(current->journal_info == NULL);
 316
 317         LASSERT(ergo(flags & (HABEO_CORPUS | HABEO_REFERO),
 318                      h->th_fmt != NULL));
 319         if (h->th_fmt != NULL) {
 320                 req_capsule_set(pill, h->th_fmt);
 321                 if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_CLIENT)) {
 322                         rc = tgt_mdt_body_unpack(tsi, flags);
 323                         if (rc < 0)
 324                                 RETURN(rc);
 325                 } else if (req_capsule_has_field(pill, &RMF_OST_BODY,
 326                                                  RCL_CLIENT)) {
 327                         rc = tgt_ost_body_unpack(tsi, flags);
 328                         if (rc < 0)
 329                                 RETURN(rc);
 330                 }
 331         }
 332
 333         if (flags & MUTABOR && tgt_conn_flags(tsi) & OBD_CONNECT_RDONLY)
 334                 RETURN(-EROFS);
 335
 336         if (flags & HABEO_CLAVIS) {
 337                 struct ldlm_request *dlm_req;
 338
 339                 LASSERT(h->th_fmt != NULL);
 340
 341                 dlm_req = req_capsule_client_get(pill, &RMF_DLM_REQ);
 342                 if (dlm_req != NULL) {
 343                         if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
 344                                      LDLM_IBITS &&
 345                                      dlm_req->lock_desc.l_policy_data.\
 346                                      l_inodebits.bits == 0)) {
 347                                 /*
 348                                  * Lock without inodebits makes no sense and
 349                                  * will oops later in ldlm. If client miss to
 350                                  * set such bits, do not trigger ASSERTION.
 351                                  *
 352                                  * For liblustre flock case, it maybe zero.
 353                                  */
 354                                 rc = -EPROTO;
 355                         } else {
 356                                 tsi->tsi_dlm_req = dlm_req;
 357                         }
 358                 } else {
 359                         rc = -EFAULT;
 360                 }
 361         }
 362         tsi->tsi_preprocessed = 1;
 363         RETURN(rc);
 364 }
 365
 366 /*
 367  * Invoke handler for this request opc. Also do necessary preprocessing
 368  * (according to handler ->th_flags), and post-processing (setting of
 369  * ->last_{xid,committed}).
 370  */
 371 static int tgt_handle_request0(struct tgt_session_info *tsi,
 372                                struct tgt_handler *h,
 373                                struct ptlrpc_request *req)
 374 {
 375         int      serious = 0;
 376         int      rc;
 377         __u32    opc = lustre_msg_get_opc(req->rq_reqmsg);
 378
 379         ENTRY;
 380
 381
 382         /* When dealing with sec context requests, no export is associated yet,
 383          * because these requests are sent before *_CONNECT requests.
 384          * A NULL req->rq_export means the normal *_common_slice handlers will
 385          * not be called, because there is no reference to the target.
 386          * So deal with them by hand and jump directly to target_send_reply().
 387          */
 388         switch (opc) {
 389         case SEC_CTX_INIT:
 390         case SEC_CTX_INIT_CONT:
 391         case SEC_CTX_FINI:
 392                 CFS_FAIL_TIMEOUT(OBD_FAIL_SEC_CTX_HDL_PAUSE, cfs_fail_val);
 393                 GOTO(out, rc = 0);
 394         }
 395
 396         /*
 397          * Checking for various OBD_FAIL_$PREF_$OPC_NET codes. _Do_ not try
 398          * to put same checks into handlers like mdt_close(), mdt_reint(),
 399          * etc., without talking to mdt authors first. Checking same thing
 400          * there again is useless and returning 0 error without packing reply
 401          * is buggy! Handlers either pack reply or return error.
 402          *
 403          * We return 0 here and do not send any reply in order to emulate
 404          * network failure. Do not send any reply in case any of NET related
 405          * fail_id has occured.
 406          */
 407         if (OBD_FAIL_CHECK_ORSET(h->th_fail_id, OBD_FAIL_ONCE))
 408                 RETURN(0);
 409         if (unlikely(lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT &&
 410                      OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_MULTI_NET)))
 411                 RETURN(0);
 412
 413         rc = tgt_request_preprocess(tsi, h, req);
 414         /* pack reply if reply format is fixed */
 415         if (rc == 0 && h->th_flags & HABEO_REFERO) {
 416                 /* Pack reply */
 417                 if (req_capsule_has_field(tsi->tsi_pill, &RMF_MDT_MD,
 418                                           RCL_SERVER))
 419                         req_capsule_set_size(tsi->tsi_pill, &RMF_MDT_MD,
 420                                              RCL_SERVER,
 421                                              tsi->tsi_mdt_body->mbo_eadatasize);
 422                 if (req_capsule_has_field(tsi->tsi_pill, &RMF_LOGCOOKIES,
 423                                           RCL_SERVER))
 424                         req_capsule_set_size(tsi->tsi_pill, &RMF_LOGCOOKIES,
 425                                              RCL_SERVER, 0);
 426
 427                 rc = req_capsule_server_pack(tsi->tsi_pill);
 428         }
 429
 430         if (likely(rc == 0)) {
 431                 /*
 432                  * Process request, there can be two types of rc:
 433                  * 1) errors with msg unpack/pack, other failures outside the
 434                  * operation itself. This is counted as serious errors;
 435                  * 2) errors during fs operation, should be placed in rq_status
 436                  * only
 437                  */
 438                 rc = h->th_act(tsi);
 439                 if (!is_serious(rc) &&
 440                     !req->rq_no_reply && req->rq_reply_state == NULL) {
 441                         DEBUG_REQ(D_ERROR, req, "%s \"handler\" %s did not "
 442                                   "pack reply and returned 0 error\n",
 443                                   tgt_name(tsi->tsi_tgt), h->th_name);
 444                         LBUG();
 445                 }
 446                 serious = is_serious(rc);
 447                 rc = clear_serious(rc);
 448         } else {
 449                 serious = 1;
 450         }
 451
 452         req->rq_status = rc;
 453
 454         /*
 455          * ELDLM_* codes which > 0 should be in rq_status only as well as
 456          * all non-serious errors.
 457          */
 458         if (rc > 0 || !serious)
 459                 rc = 0;
 460
 461         LASSERT(current->journal_info == NULL);
 462
 463         if (likely(rc == 0 && req->rq_export))
 464                 target_committed_to_req(req);
 465
 466 out:
 467         target_send_reply(req, rc, tsi->tsi_reply_fail_id);
 468         RETURN(0);
 469 }
 470
 471 static int tgt_filter_recovery_request(struct ptlrpc_request *req,
 472                                        struct obd_device *obd, int *process)
 473 {
 474         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
 475         case MDS_DISCONNECT:
 476         case OST_DISCONNECT:
 477         case OBD_IDX_READ:
 478                 *process = 1;
 479                 RETURN(0);
 480         case MDS_CLOSE:
 481         case MDS_SYNC: /* used in unmounting */
 482         case OBD_PING:
 483         case MDS_REINT:
 484         case OUT_UPDATE:
 485         case SEQ_QUERY:
 486         case FLD_QUERY:
 487         case FLD_READ:
 488         case LDLM_ENQUEUE:
 489         case OST_CREATE:
 490         case OST_DESTROY:
 491         case OST_PUNCH:
 492         case OST_SETATTR:
 493         case OST_SYNC:
 494         case OST_WRITE:
 495         case MDS_HSM_PROGRESS:
 496         case MDS_HSM_STATE_SET:
 497         case MDS_HSM_REQUEST:
 498                 *process = target_queue_recovery_request(req, obd);
 499                 RETURN(0);
 500
 501         default:
 502                 DEBUG_REQ(D_ERROR, req, "not permitted during recovery");
 503                 *process = -EAGAIN;
 504                 RETURN(0);
 505         }
 506 }
 507
 508 /*
 509  * Handle recovery. Return:
 510  *        +1: continue request processing;
 511  *       -ve: abort immediately with the given error code;
 512  *         0: send reply with error code in req->rq_status;
 513  */
 514 static int tgt_handle_recovery(struct ptlrpc_request *req, int reply_fail_id)
 515 {
 516         ENTRY;
 517
 518         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
 519         case MDS_CONNECT:
 520         case OST_CONNECT:
 521         case MGS_CONNECT:
 522         case SEC_CTX_INIT:
 523         case SEC_CTX_INIT_CONT:
 524         case SEC_CTX_FINI:
 525                 RETURN(+1);
 526         }
 527
 528         if (!req->rq_export->exp_obd->obd_replayable)
 529                 RETURN(+1);
 530
 531         /* sanity check: if the xid matches, the request must be marked as a
 532          * resent or replayed */
 533         if (req_can_reconstruct(req, NULL)) {
 534                 if (!(lustre_msg_get_flags(req->rq_reqmsg) &
 535                       (MSG_RESENT | MSG_REPLAY))) {
 536                         DEBUG_REQ(D_WARNING, req, "rq_xid "LPU64" matches "
 537                                   "saved xid, expected REPLAY or RESENT flag "
 538                                   "(%x)", req->rq_xid,
 539                                   lustre_msg_get_flags(req->rq_reqmsg));
 540                         req->rq_status = -ENOTCONN;
 541                         RETURN(-ENOTCONN);
 542                 }
 543         }
 544         /* else: note the opposite is not always true; a RESENT req after a
 545          * failover will usually not match the last_xid, since it was likely
 546          * never committed. A REPLAYed request will almost never match the
 547          * last xid, however it could for a committed, but still retained,
 548          * open. */
 549
 550         /* Check for aborted recovery... */
 551         if (unlikely(req->rq_export->exp_obd->obd_recovering)) {
 552                 int rc;
 553                 int should_process;
 554
 555                 DEBUG_REQ(D_INFO, req, "Got new replay");
 556                 rc = tgt_filter_recovery_request(req, req->rq_export->exp_obd,
 557                                                  &should_process);
 558                 if (rc != 0 || !should_process)
 559                         RETURN(rc);
 560                 else if (should_process < 0) {
 561                         req->rq_status = should_process;
 562                         rc = ptlrpc_error(req);
 563                         RETURN(rc);
 564                 }
 565         }
 566         RETURN(+1);
 567 }
 568
 569 /* Initial check for request, it is validation mostly */
 570 static struct tgt_handler *tgt_handler_find_check(struct ptlrpc_request *req)
 571 {
 572         struct tgt_handler      *h;
 573         struct tgt_opc_slice    *s;
 574         struct lu_target        *tgt;
 575         __u32                    opc = lustre_msg_get_opc(req->rq_reqmsg);
 576
 577         ENTRY;
 578
 579         tgt = class_exp2tgt(req->rq_export);
 580         if (unlikely(tgt == NULL)) {
 581                 DEBUG_REQ(D_ERROR, req, "%s: No target for connected export\n",
 582                           class_exp2obd(req->rq_export)->obd_name);
 583                 RETURN(ERR_PTR(-EINVAL));
 584         }
 585
 586         for (s = tgt->lut_slice; s->tos_hs != NULL; s++)
 587                 if (s->tos_opc_start <= opc && opc < s->tos_opc_end)
 588                         break;
 589
 590         /* opcode was not found in slice */
 591         if (unlikely(s->tos_hs == NULL)) {
 592                 CERROR("%s: no handlers for opcode 0x%x\n", tgt_name(tgt),
 593                        opc);
 594                 RETURN(ERR_PTR(-ENOTSUPP));
 595         }
 596
 597         LASSERT(opc >= s->tos_opc_start && opc < s->tos_opc_end);
 598         h = s->tos_hs + (opc - s->tos_opc_start);
 599         if (unlikely(h->th_opc == 0)) {
 600                 CERROR("%s: unsupported opcode 0x%x\n", tgt_name(tgt), opc);
 601                 RETURN(ERR_PTR(-ENOTSUPP));
 602         }
 603
 604         RETURN(h);
 605 }
 606
 607 static int process_req_last_xid(struct ptlrpc_request *req)
 608 {
 609         __u64   last_xid;
 610         ENTRY;
 611
 612         /* check request's xid is consistent with export's last_xid */
 613         last_xid = lustre_msg_get_last_xid(req->rq_reqmsg);
 614         if (last_xid > req->rq_export->exp_last_xid)
 615                 req->rq_export->exp_last_xid = last_xid;
 616
 617         if (req->rq_xid == 0 ||
 618             (req->rq_xid <= req->rq_export->exp_last_xid)) {
 619                 DEBUG_REQ(D_ERROR, req, "Unexpected xid %llx vs. "
 620                           "last_xid %llx\n", req->rq_xid,
 621                           req->rq_export->exp_last_xid);
 622                 /* Some request is allowed to be sent during replay,
 623                  * such as OUT update requests, FLD requests, so it
 624                  * is possible that replay requests has smaller XID
 625                  * than the exp_last_xid.
 626                  *
 627                  * Some non-replay requests may have smaller XID as
 628                  * well:
 629                  *
 630                  * - Client send a no_resend RPC, like statfs;
 631                  * - The RPC timedout (or some other error) on client,
 632                  *   then it's removed from the unreplied list;
 633                  * - Client send some other request to bump the
 634                  *   exp_last_xid on server;
 635                  * - The former RPC got chance to be processed;
 636                  */
 637                 if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)) {
 638                         req->rq_status = -EPROTO;
 639                         RETURN(ptlrpc_error(req));
 640                 }
 641         }
 642
 643         /* try to release in-memory reply data */
 644         if (tgt_is_multimodrpcs_client(req->rq_export)) {
 645                 tgt_handle_received_xid(req->rq_export,
 646                                 lustre_msg_get_last_xid(req->rq_reqmsg));
 647                 if (!(lustre_msg_get_flags(req->rq_reqmsg) &
 648                       (MSG_RESENT | MSG_REPLAY)))
 649                         tgt_handle_tag(req->rq_export,
 650                                        lustre_msg_get_tag(req->rq_reqmsg));
 651         }
 652         RETURN(0);
 653 }
 654
 655 int tgt_request_handle(struct ptlrpc_request *req)
 656 {
 657         struct tgt_session_info *tsi = tgt_ses_info(req->rq_svc_thread->t_env);
 658
 659         struct lustre_msg       *msg = req->rq_reqmsg;
 660         struct tgt_handler      *h;
 661         struct lu_target        *tgt;
 662         int                      request_fail_id = 0;
 663         __u32                    opc = lustre_msg_get_opc(msg);
 664         struct obd_device       *obd;
 665         int                      rc;
 666         bool                     is_connect = false;
 667         ENTRY;
 668
 669         /* Refill the context, to make sure all thread keys are allocated */
 670         lu_env_refill(req->rq_svc_thread->t_env);
 671
 672         req_capsule_init(&req->rq_pill, req, RCL_SERVER);
 673         tsi->tsi_pill = &req->rq_pill;
 674         tsi->tsi_env = req->rq_svc_thread->t_env;
 675
 676         /* if request has export then get handlers slice from corresponding
 677          * target, otherwise that should be connect operation */
 678         if (opc == MDS_CONNECT || opc == OST_CONNECT ||
 679             opc == MGS_CONNECT) {
 680                 is_connect = true;
 681                 req_capsule_set(&req->rq_pill, &RQF_CONNECT);
 682                 rc = target_handle_connect(req);
 683                 if (rc != 0) {
 684                         rc = ptlrpc_error(req);
 685                         GOTO(out, rc);
 686                 }
 687                 /* recovery-small test 18c asks to drop connect reply */
 688                 if (unlikely(opc == OST_CONNECT &&
 689                              OBD_FAIL_CHECK(OBD_FAIL_OST_CONNECT_NET2)))
 690                         GOTO(out, rc = 0);
 691         }
 692
 693         if (unlikely(!class_connected_export(req->rq_export))) {
 694                 if (opc == SEC_CTX_INIT || opc == SEC_CTX_INIT_CONT ||
 695                     opc == SEC_CTX_FINI) {
 696                         /* sec context initialization has to be handled
 697                          * by hand in tgt_handle_request0() */
 698                         tsi->tsi_reply_fail_id = OBD_FAIL_SEC_CTX_INIT_NET;
 699                         h = NULL;
 700                         GOTO(handle_recov, rc = 0);
 701                 }
 702                 CDEBUG(D_HA, "operation %d on unconnected OST from %s\n",
 703                        opc, libcfs_id2str(req->rq_peer));
 704                 req->rq_status = -ENOTCONN;
 705                 rc = ptlrpc_error(req);
 706                 GOTO(out, rc);
 707         }
 708
 709         tsi->tsi_tgt = tgt = class_exp2tgt(req->rq_export);
 710         tsi->tsi_exp = req->rq_export;
 711         if (exp_connect_flags(req->rq_export) & OBD_CONNECT_JOBSTATS)
 712                 tsi->tsi_jobid = lustre_msg_get_jobid(req->rq_reqmsg);
 713         else
 714                 tsi->tsi_jobid = NULL;
 715
 716         if (tgt == NULL) {
 717                 DEBUG_REQ(D_ERROR, req, "%s: No target for connected export\n",
 718                           class_exp2obd(req->rq_export)->obd_name);
 719                 req->rq_status = -EINVAL;
 720                 rc = ptlrpc_error(req);
 721                 GOTO(out, rc);
 722         }
 723
 724         /* Skip last_xid processing for the recovery thread, otherwise, the
 725          * last_xid on same request could be processed twice: first time when
 726          * processing the incoming request, second time when the request is
 727          * being processed by recovery thread. */
 728         obd = class_exp2obd(req->rq_export);
 729         if (is_connect) {
 730                 /* reset the exp_last_xid on each connection. */
 731                 req->rq_export->exp_last_xid = 0;
 732         } else if (obd->obd_recovery_data.trd_processing_task !=
 733                    current_pid()) {
 734                 rc = process_req_last_xid(req);
 735                 if (rc)
 736                         GOTO(out, rc);
 737         }
 738
 739         request_fail_id = tgt->lut_request_fail_id;
 740         tsi->tsi_reply_fail_id = tgt->lut_reply_fail_id;
 741
 742         h = tgt_handler_find_check(req);
 743         if (IS_ERR(h)) {
 744                 req->rq_status = PTR_ERR(h);
 745                 rc = ptlrpc_error(req);
 746                 GOTO(out, rc);
 747         }
 748
 749         LASSERTF(h->th_opc == opc, "opcode mismatch %d != %d\n",
 750                  h->th_opc, opc);
 751
 752         if (CFS_FAIL_CHECK_ORSET(request_fail_id, CFS_FAIL_ONCE))
 753                 GOTO(out, rc = 0);
 754
 755         rc = lustre_msg_check_version(msg, h->th_version);
 756         if (unlikely(rc)) {
 757                 DEBUG_REQ(D_ERROR, req, "%s: drop mal-formed request, version"
 758                           " %08x, expecting %08x\n", tgt_name(tgt),
 759                           lustre_msg_get_version(msg), h->th_version);
 760                 req->rq_status = -EINVAL;
 761                 rc = ptlrpc_error(req);
 762                 GOTO(out, rc);
 763         }
 764
 765 handle_recov:
 766         rc = tgt_handle_recovery(req, tsi->tsi_reply_fail_id);
 767         if (likely(rc == 1)) {
 768                 rc = tgt_handle_request0(tsi, h, req);
 769                 if (rc)
 770                         GOTO(out, rc);
 771         }
 772         EXIT;
 773 out:
 774         req_capsule_fini(tsi->tsi_pill);
 775         if (tsi->tsi_corpus != NULL) {
 776                 lu_object_put(tsi->tsi_env, tsi->tsi_corpus);
 777                 tsi->tsi_corpus = NULL;
 778         }
 779         return rc;
 780 }
 781 EXPORT_SYMBOL(tgt_request_handle);
 782
 783 /** Assign high priority operations to the request if needed. */
 784 int tgt_hpreq_handler(struct ptlrpc_request *req)
 785 {
 786         struct tgt_session_info *tsi = tgt_ses_info(req->rq_svc_thread->t_env);
 787         struct tgt_handler      *h;
 788         int                      rc;
 789
 790         ENTRY;
 791
 792         if (req->rq_export == NULL)
 793                 RETURN(0);
 794
 795         req_capsule_init(&req->rq_pill, req, RCL_SERVER);
 796         tsi->tsi_pill = &req->rq_pill;
 797         tsi->tsi_env = req->rq_svc_thread->t_env;
 798         tsi->tsi_tgt = class_exp2tgt(req->rq_export);
 799         tsi->tsi_exp = req->rq_export;
 800
 801         h = tgt_handler_find_check(req);
 802         if (IS_ERR(h)) {
 803                 rc = PTR_ERR(h);
 804                 RETURN(rc);
 805         }
 806
 807         rc = tgt_request_preprocess(tsi, h, req);
 808         if (unlikely(rc != 0))
 809                 RETURN(rc);
 810
 811         if (h->th_hp != NULL)
 812                 h->th_hp(tsi);
 813         RETURN(0);
 814 }
 815 EXPORT_SYMBOL(tgt_hpreq_handler);
 816
 817 void tgt_counter_incr(struct obd_export *exp, int opcode)
 818 {
 819         lprocfs_counter_incr(exp->exp_obd->obd_stats, opcode);
 820         if (exp->exp_nid_stats && exp->exp_nid_stats->nid_stats != NULL)
 821                 lprocfs_counter_incr(exp->exp_nid_stats->nid_stats, opcode);
 822 }
 823 EXPORT_SYMBOL(tgt_counter_incr);
 824
 825 /*
 826  * Unified target generic handlers.
 827  */
 828
 829 /*
 830  * Security functions
 831  */
 832 static inline void tgt_init_sec_none(struct obd_connect_data *reply)
 833 {
 834         reply->ocd_connect_flags &= ~(OBD_CONNECT_RMT_CLIENT |
 835                                       OBD_CONNECT_RMT_CLIENT_FORCE);
 836 }
 837
 838 static int tgt_init_sec_level(struct ptlrpc_request *req)
 839 {
 840         struct lu_target        *tgt = class_exp2tgt(req->rq_export);
 841         char                    *client;
 842         struct obd_connect_data *data, *reply;
 843         int                      rc = 0;
 844         bool                     remote;
 845         ENTRY;
 846
 847         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 848         reply = req_capsule_server_get(&req->rq_pill, &RMF_CONNECT_DATA);
 849         if (data == NULL || reply == NULL)
 850                 RETURN(-EFAULT);
 851
 852         /* connection from MDT is always trusted */
 853         if (req->rq_auth_usr_mdt) {
 854                 tgt_init_sec_none(reply);
 855                 RETURN(0);
 856         }
 857
 858         if (unlikely(tgt == NULL)) {
 859                 DEBUG_REQ(D_ERROR, req, "%s: No target for connected export\n",
 860                           class_exp2obd(req->rq_export)->obd_name);
 861                 RETURN(-EINVAL);
 862         }
 863
 864         client = libcfs_nid2str(req->rq_peer.nid);
 865         /* no GSS support case */
 866         if (!req->rq_auth_gss) {
 867                 if (tgt->lut_sec_level > LUSTRE_SEC_NONE) {
 868                         CWARN("client %s -> target %s does not use GSS, "
 869                               "can not run under security level %d.\n",
 870                               client, tgt_name(tgt), tgt->lut_sec_level);
 871                         RETURN(-EACCES);
 872                 } else {
 873                         tgt_init_sec_none(reply);
 874                         RETURN(0);
 875                 }
 876         }
 877
 878         /* old version case */
 879         if (unlikely(!(data->ocd_connect_flags & OBD_CONNECT_RMT_CLIENT) ||
 880                      !(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         remote = data->ocd_connect_flags & OBD_CONNECT_RMT_CLIENT_FORCE;
 897         if (remote) {
 898                 if (!req->rq_auth_remote)
 899                         CDEBUG(D_SEC, "client (local realm) %s -> target %s "
 900                                "asked to be remote.\n", client, tgt_name(tgt));
 901         } else if (req->rq_auth_remote) {
 902                 remote = true;
 903                 CDEBUG(D_SEC, "client (remote realm) %s -> target %s is set "
 904                        "as remote by default.\n", client, tgt_name(tgt));
 905         }
 906
 907         if (remote == 0) {
 908                 if (!uid_valid(make_kuid(&init_user_ns, req->rq_auth_uid))) {
 909                         CDEBUG(D_SEC, "client %s -> target %s: user is not "
 910                                "authenticated!\n", client, tgt_name(tgt));
 911                         RETURN(-EACCES);
 912                 }
 913         }
 914
 915
 916         switch (tgt->lut_sec_level) {
 917         case LUSTRE_SEC_NONE:
 918                 if (remote) {
 919                         CDEBUG(D_SEC,
 920                                "client %s -> target %s is set as remote, "
 921                                "can not run under security level %d.\n",
 922                                client, tgt_name(tgt), tgt->lut_sec_level);
 923                         RETURN(-EACCES);
 924                 }
 925                 tgt_init_sec_none(reply);
 926                 break;
 927         case LUSTRE_SEC_REMOTE:
 928                 if (!remote)
 929                         tgt_init_sec_none(reply);
 930                 break;
 931         case LUSTRE_SEC_ALL:
 932                 if (remote)
 933                         break;
 934                 reply->ocd_connect_flags &= ~(OBD_CONNECT_RMT_CLIENT |
 935                                               OBD_CONNECT_RMT_CLIENT_FORCE);
 936                 reply->ocd_connect_flags &= ~OBD_CONNECT_OSS_CAPA;
 937                 reply->ocd_connect_flags &= ~OBD_CONNECT_MDS_CAPA;
 938                 break;
 939         default:
 940                 RETURN(-EINVAL);
 941         }
 942
 943         RETURN(rc);
 944 }
 945
 946 int tgt_connect_check_sptlrpc(struct ptlrpc_request *req, struct obd_export *exp)
 947 {
 948         struct lu_target        *tgt = class_exp2tgt(exp);
 949         struct sptlrpc_flavor    flvr;
 950         int                      rc = 0;
 951
 952         LASSERT(tgt);
 953         LASSERT(tgt->lut_obd);
 954         LASSERT(tgt->lut_slice);
 955
 956         /* always allow ECHO client */
 957         if (unlikely(strcmp(exp->exp_obd->obd_type->typ_name,
 958                             LUSTRE_ECHO_NAME) == 0)) {
 959                 exp->exp_flvr.sf_rpc = SPTLRPC_FLVR_ANY;
 960                 return 0;
 961         }
 962
 963         if (exp->exp_flvr.sf_rpc == SPTLRPC_FLVR_INVALID) {
 964                 read_lock(&tgt->lut_sptlrpc_lock);
 965                 sptlrpc_target_choose_flavor(&tgt->lut_sptlrpc_rset,
 966                                              req->rq_sp_from,
 967                                              req->rq_peer.nid,
 968                                              &flvr);
 969                 read_unlock(&tgt->lut_sptlrpc_lock);
 970
 971                 spin_lock(&exp->exp_lock);
 972                 exp->exp_sp_peer = req->rq_sp_from;
 973                 exp->exp_flvr = flvr;
 974
 975                 /* when on mgs, if no restriction is set, or if client
 976                  * is loopback, allow any flavor */
 977                 if ((strcmp(exp->exp_obd->obd_type->typ_name,
 978                            LUSTRE_MGS_NAME) == 0) &&
 979                      (exp->exp_flvr.sf_rpc == SPTLRPC_FLVR_NULL ||
 980                       LNET_NETTYP(LNET_NIDNET(exp->exp_connection->c_peer.nid))
 981                       == LOLND))
 982                         exp->exp_flvr.sf_rpc = SPTLRPC_FLVR_ANY;
 983
 984                 if (exp->exp_flvr.sf_rpc != SPTLRPC_FLVR_ANY &&
 985                     exp->exp_flvr.sf_rpc != req->rq_flvr.sf_rpc) {
 986                         CERROR("%s: unauthorized rpc flavor %x from %s, "
 987                                "expect %x\n", tgt_name(tgt),
 988                                req->rq_flvr.sf_rpc,
 989                                libcfs_nid2str(req->rq_peer.nid),
 990                                exp->exp_flvr.sf_rpc);
 991                         rc = -EACCES;
 992                 }
 993                 spin_unlock(&exp->exp_lock);
 994         } else {
 995                 if (exp->exp_sp_peer != req->rq_sp_from) {
 996                         CERROR("%s: RPC source %s doesn't match %s\n",
 997                                tgt_name(tgt),
 998                                sptlrpc_part2name(req->rq_sp_from),
 999                                sptlrpc_part2name(exp->exp_sp_peer));
1000                         rc = -EACCES;
1001                 } else {
1002                         rc = sptlrpc_target_export_check(exp, req);
1003                 }
1004         }
1005
1006         return rc;
1007 }
1008
1009 int tgt_adapt_sptlrpc_conf(struct lu_target *tgt, int initial)
1010 {
1011         struct sptlrpc_rule_set  tmp_rset;
1012         int                      rc;
1013
1014         if (unlikely(tgt == NULL)) {
1015                 CERROR("No target passed");
1016                 return -EINVAL;
1017         }
1018
1019         sptlrpc_rule_set_init(&tmp_rset);
1020         rc = sptlrpc_conf_target_get_rules(tgt->lut_obd, &tmp_rset, initial);
1021         if (rc) {
1022                 CERROR("%s: failed get sptlrpc rules: rc = %d\n",
1023                        tgt_name(tgt), rc);
1024                 return rc;
1025         }
1026
1027         sptlrpc_target_update_exp_flavor(tgt->lut_obd, &tmp_rset);
1028
1029         write_lock(&tgt->lut_sptlrpc_lock);
1030         sptlrpc_rule_set_free(&tgt->lut_sptlrpc_rset);
1031         tgt->lut_sptlrpc_rset = tmp_rset;
1032         write_unlock(&tgt->lut_sptlrpc_lock);
1033
1034         return 0;
1035 }
1036 EXPORT_SYMBOL(tgt_adapt_sptlrpc_conf);
1037
1038 int tgt_connect(struct tgt_session_info *tsi)
1039 {
1040         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1041         struct obd_connect_data *reply;
1042         int                      rc;
1043
1044         ENTRY;
1045
1046         rc = tgt_init_sec_level(req);
1047         if (rc != 0)
1048                 GOTO(out, rc);
1049
1050         /* XXX: better to call this check right after getting new export but
1051          * before last_rcvd slot allocation to avoid server load upon insecure
1052          * connects. This is to be fixed after unifiyng all targets.
1053          */
1054         rc = tgt_connect_check_sptlrpc(req, tsi->tsi_exp);
1055         if (rc)
1056                 GOTO(out, rc);
1057
1058         /* To avoid exposing partially initialized connection flags, changes up
1059          * to this point have been staged in reply->ocd_connect_flags. Now that
1060          * connection handling has completed successfully, atomically update
1061          * the connect flags in the shared export data structure. LU-1623 */
1062         reply = req_capsule_server_get(tsi->tsi_pill, &RMF_CONNECT_DATA);
1063         spin_lock(&tsi->tsi_exp->exp_lock);
1064         *exp_connect_flags_ptr(tsi->tsi_exp) = reply->ocd_connect_flags;
1065         tsi->tsi_exp->exp_connect_data.ocd_brw_size = reply->ocd_brw_size;
1066         spin_unlock(&tsi->tsi_exp->exp_lock);
1067
1068         RETURN(0);
1069 out:
1070         obd_disconnect(class_export_get(tsi->tsi_exp));
1071         return rc;
1072 }
1073 EXPORT_SYMBOL(tgt_connect);
1074
1075 int tgt_disconnect(struct tgt_session_info *tsi)
1076 {
1077         int rc;
1078
1079         ENTRY;
1080
1081         rc = target_handle_disconnect(tgt_ses_req(tsi));
1082         if (rc)
1083                 RETURN(err_serious(rc));
1084
1085         RETURN(rc);
1086 }
1087 EXPORT_SYMBOL(tgt_disconnect);
1088
1089 /*
1090  * Unified target OBD handlers
1091  */
1092 int tgt_obd_ping(struct tgt_session_info *tsi)
1093 {
1094         int rc;
1095
1096         ENTRY;
1097
1098         rc = target_handle_ping(tgt_ses_req(tsi));
1099         if (rc)
1100                 RETURN(err_serious(rc));
1101
1102         RETURN(rc);
1103 }
1104 EXPORT_SYMBOL(tgt_obd_ping);
1105
1106 int tgt_obd_log_cancel(struct tgt_session_info *tsi)
1107 {
1108         return err_serious(-EOPNOTSUPP);
1109 }
1110
1111 int tgt_send_buffer(struct tgt_session_info *tsi, struct lu_rdbuf *rdbuf)
1112 {
1113         struct tgt_thread_info  *tti = tgt_th_info(tsi->tsi_env);
1114         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1115         struct obd_export       *exp = req->rq_export;
1116         struct ptlrpc_bulk_desc *desc;
1117         struct l_wait_info      *lwi = &tti->tti_u.update.tti_wait_info;
1118         int                      i;
1119         int                      rc;
1120
1121         ENTRY;
1122
1123         desc = ptlrpc_prep_bulk_exp(req, rdbuf->rb_nbufs, 1,
1124                                   PTLRPC_BULK_PUT_SOURCE | PTLRPC_BULK_BUF_KVEC,
1125                                     MDS_BULK_PORTAL, &ptlrpc_bulk_kvec_ops);
1126         if (desc == NULL)
1127                 RETURN(-ENOMEM);
1128
1129         for (i = 0; i < rdbuf->rb_nbufs; i++)
1130                 desc->bd_frag_ops->add_iov_frag(desc,
1131                                         rdbuf->rb_bufs[i].lb_buf,
1132                                         rdbuf->rb_bufs[i].lb_len);
1133
1134         rc = target_bulk_io(exp, desc, lwi);
1135         ptlrpc_free_bulk(desc);
1136         RETURN(rc);
1137 }
1138 EXPORT_SYMBOL(tgt_send_buffer);
1139
1140 int tgt_sendpage(struct tgt_session_info *tsi, struct lu_rdpg *rdpg, int nob)
1141 {
1142         struct tgt_thread_info  *tti = tgt_th_info(tsi->tsi_env);
1143         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1144         struct obd_export       *exp = req->rq_export;
1145         struct ptlrpc_bulk_desc *desc;
1146         struct l_wait_info      *lwi = &tti->tti_u.rdpg.tti_wait_info;
1147         int                      tmpcount;
1148         int                      tmpsize;
1149         int                      i;
1150         int                      rc;
1151
1152         ENTRY;
1153
1154         desc = ptlrpc_prep_bulk_exp(req, rdpg->rp_npages, 1,
1155                                     PTLRPC_BULK_PUT_SOURCE |
1156                                         PTLRPC_BULK_BUF_KIOV,
1157                                     MDS_BULK_PORTAL,
1158                                     &ptlrpc_bulk_kiov_pin_ops);
1159         if (desc == NULL)
1160                 RETURN(-ENOMEM);
1161
1162         if (!(exp_connect_flags(exp) & OBD_CONNECT_BRW_SIZE))
1163                 /* old client requires reply size in it's PAGE_CACHE_SIZE,
1164                  * which is rdpg->rp_count */
1165                 nob = rdpg->rp_count;
1166
1167         for (i = 0, tmpcount = nob; i < rdpg->rp_npages && tmpcount > 0;
1168              i++, tmpcount -= tmpsize) {
1169                 tmpsize = min_t(int, tmpcount, PAGE_CACHE_SIZE);
1170                 desc->bd_frag_ops->add_kiov_frag(desc, rdpg->rp_pages[i], 0,
1171                                                  tmpsize);
1172         }
1173
1174         LASSERT(desc->bd_nob == nob);
1175         rc = target_bulk_io(exp, desc, lwi);
1176         ptlrpc_free_bulk(desc);
1177         RETURN(rc);
1178 }
1179 EXPORT_SYMBOL(tgt_sendpage);
1180
1181 /*
1182  * OBD_IDX_READ handler
1183  */
1184 static int tgt_obd_idx_read(struct tgt_session_info *tsi)
1185 {
1186         struct tgt_thread_info  *tti = tgt_th_info(tsi->tsi_env);
1187         struct lu_rdpg          *rdpg = &tti->tti_u.rdpg.tti_rdpg;
1188         struct idx_info         *req_ii, *rep_ii;
1189         int                      rc, i;
1190
1191         ENTRY;
1192
1193         memset(rdpg, 0, sizeof(*rdpg));
1194         req_capsule_set(tsi->tsi_pill, &RQF_OBD_IDX_READ);
1195
1196         /* extract idx_info buffer from request & reply */
1197         req_ii = req_capsule_client_get(tsi->tsi_pill, &RMF_IDX_INFO);
1198         if (req_ii == NULL || req_ii->ii_magic != IDX_INFO_MAGIC)
1199                 RETURN(err_serious(-EPROTO));
1200
1201         rc = req_capsule_server_pack(tsi->tsi_pill);
1202         if (rc)
1203                 RETURN(err_serious(rc));
1204
1205         rep_ii = req_capsule_server_get(tsi->tsi_pill, &RMF_IDX_INFO);
1206         if (rep_ii == NULL)
1207                 RETURN(err_serious(-EFAULT));
1208         rep_ii->ii_magic = IDX_INFO_MAGIC;
1209
1210         /* extract hash to start with */
1211         rdpg->rp_hash = req_ii->ii_hash_start;
1212
1213         /* extract requested attributes */
1214         rdpg->rp_attrs = req_ii->ii_attrs;
1215
1216         /* check that fid packed in request is valid and supported */
1217         if (!fid_is_sane(&req_ii->ii_fid))
1218                 RETURN(-EINVAL);
1219         rep_ii->ii_fid = req_ii->ii_fid;
1220
1221         /* copy flags */
1222         rep_ii->ii_flags = req_ii->ii_flags;
1223
1224         /* compute number of pages to allocate, ii_count is the number of 4KB
1225          * containers */
1226         if (req_ii->ii_count <= 0)
1227                 GOTO(out, rc = -EFAULT);
1228         rdpg->rp_count = min_t(unsigned int, req_ii->ii_count << LU_PAGE_SHIFT,
1229                                exp_max_brw_size(tsi->tsi_exp));
1230         rdpg->rp_npages = (rdpg->rp_count + PAGE_CACHE_SIZE -1) >> PAGE_CACHE_SHIFT;
1231
1232         /* allocate pages to store the containers */
1233         OBD_ALLOC(rdpg->rp_pages, rdpg->rp_npages * sizeof(rdpg->rp_pages[0]));
1234         if (rdpg->rp_pages == NULL)
1235                 GOTO(out, rc = -ENOMEM);
1236         for (i = 0; i < rdpg->rp_npages; i++) {
1237                 rdpg->rp_pages[i] = alloc_page(GFP_IOFS);
1238                 if (rdpg->rp_pages[i] == NULL)
1239                         GOTO(out, rc = -ENOMEM);
1240         }
1241
1242         /* populate pages with key/record pairs */
1243         rc = dt_index_read(tsi->tsi_env, tsi->tsi_tgt->lut_bottom, rep_ii, rdpg);
1244         if (rc < 0)
1245                 GOTO(out, rc);
1246
1247         LASSERTF(rc <= rdpg->rp_count, "dt_index_read() returned more than "
1248                  "asked %d > %d\n", rc, rdpg->rp_count);
1249
1250         /* send pages to client */
1251         rc = tgt_sendpage(tsi, rdpg, rc);
1252         if (rc)
1253                 GOTO(out, rc);
1254         EXIT;
1255 out:
1256         if (rdpg->rp_pages) {
1257                 for (i = 0; i < rdpg->rp_npages; i++)
1258                         if (rdpg->rp_pages[i])
1259                                 __free_page(rdpg->rp_pages[i]);
1260                 OBD_FREE(rdpg->rp_pages,
1261                          rdpg->rp_npages * sizeof(rdpg->rp_pages[0]));
1262         }
1263         return rc;
1264 }
1265
1266 struct tgt_handler tgt_obd_handlers[] = {
1267 TGT_OBD_HDL    (0,      OBD_PING,               tgt_obd_ping),
1268 TGT_OBD_HDL_VAR(0,      OBD_LOG_CANCEL,         tgt_obd_log_cancel),
1269 TGT_OBD_HDL    (0,      OBD_IDX_READ,           tgt_obd_idx_read)
1270 };
1271 EXPORT_SYMBOL(tgt_obd_handlers);
1272
1273 int tgt_sync(const struct lu_env *env, struct lu_target *tgt,
1274              struct dt_object *obj, __u64 start, __u64 end)
1275 {
1276         int rc = 0;
1277
1278         ENTRY;
1279
1280         /* if no objid is specified, it means "sync whole filesystem" */
1281         if (obj == NULL) {
1282                 rc = dt_sync(env, tgt->lut_bottom);
1283         } else if (dt_version_get(env, obj) >
1284                    tgt->lut_obd->obd_last_committed) {
1285                 rc = dt_object_sync(env, obj, start, end);
1286         }
1287
1288         RETURN(rc);
1289 }
1290 EXPORT_SYMBOL(tgt_sync);
1291 /*
1292  * Unified target DLM handlers.
1293  */
1294
1295 /* Ensure that data and metadata are synced to the disk when lock is cancelled
1296  * (if requested) */
1297 static int tgt_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
1298                             void *data, int flag)
1299 {
1300         struct lu_env            env;
1301         struct lu_target        *tgt;
1302         struct dt_object        *obj;
1303         struct lu_fid            fid;
1304         int                      rc = 0;
1305
1306         ENTRY;
1307
1308         tgt = class_exp2tgt(lock->l_export);
1309
1310         if (unlikely(tgt == NULL)) {
1311                 CDEBUG(D_ERROR, "%s: No target for connected export\n",
1312                        class_exp2obd(lock->l_export)->obd_name);
1313                 RETURN(-EINVAL);
1314         }
1315
1316         if (flag == LDLM_CB_CANCELING &&
1317             (lock->l_granted_mode & (LCK_PW | LCK_GROUP)) &&
1318             (tgt->lut_sync_lock_cancel == ALWAYS_SYNC_ON_CANCEL ||
1319              (tgt->lut_sync_lock_cancel == BLOCKING_SYNC_ON_CANCEL &&
1320               lock->l_flags & LDLM_FL_CBPENDING))) {
1321                 __u64 start = 0;
1322                 __u64 end = OBD_OBJECT_EOF;
1323
1324                 rc = lu_env_init(&env, LCT_DT_THREAD);
1325                 if (unlikely(rc != 0))
1326                         RETURN(rc);
1327
1328                 ost_fid_from_resid(&fid, &lock->l_resource->lr_name,
1329                                    tgt->lut_lsd.lsd_osd_index);
1330                 obj = dt_locate(&env, tgt->lut_bottom, &fid);
1331                 if (IS_ERR(obj))
1332                         GOTO(err_env, rc = PTR_ERR(obj));
1333
1334                 if (!dt_object_exists(obj))
1335                         GOTO(err_put, rc = -ENOENT);
1336
1337                 if (lock->l_resource->lr_type == LDLM_EXTENT) {
1338                         start = lock->l_policy_data.l_extent.start;
1339                         end = lock->l_policy_data.l_extent.end;
1340                 }
1341
1342                 rc = tgt_sync(&env, tgt, obj, start, end);
1343                 if (rc < 0) {
1344                         CERROR("%s: syncing "DFID" ("LPU64"-"LPU64") on lock "
1345                                "cancel: rc = %d\n",
1346                                tgt_name(tgt), PFID(&fid),
1347                                lock->l_policy_data.l_extent.start,
1348                                lock->l_policy_data.l_extent.end, rc);
1349                 }
1350 err_put:
1351                 lu_object_put(&env, &obj->do_lu);
1352 err_env:
1353                 lu_env_fini(&env);
1354         }
1355
1356         rc = ldlm_server_blocking_ast(lock, desc, data, flag);
1357         RETURN(rc);
1358 }
1359
1360 static struct ldlm_callback_suite tgt_dlm_cbs = {
1361         .lcs_completion = ldlm_server_completion_ast,
1362         .lcs_blocking   = tgt_blocking_ast,
1363         .lcs_glimpse    = ldlm_server_glimpse_ast
1364 };
1365
1366 int tgt_enqueue(struct tgt_session_info *tsi)
1367 {
1368         struct ptlrpc_request *req = tgt_ses_req(tsi);
1369         int rc;
1370
1371         ENTRY;
1372         /*
1373          * tsi->tsi_dlm_req was already swapped and (if necessary) converted,
1374          * tsi->tsi_dlm_cbs was set by the *_req_handle() function.
1375          */
1376         LASSERT(tsi->tsi_dlm_req != NULL);
1377         rc = ldlm_handle_enqueue0(tsi->tsi_exp->exp_obd->obd_namespace, req,
1378                                   tsi->tsi_dlm_req, &tgt_dlm_cbs);
1379         if (rc)
1380                 RETURN(err_serious(rc));
1381
1382         switch (LUT_FAIL_CLASS(tsi->tsi_reply_fail_id)) {
1383         case LUT_FAIL_MDT:
1384                 tsi->tsi_reply_fail_id = OBD_FAIL_MDS_LDLM_REPLY_NET;
1385                 break;
1386         case LUT_FAIL_OST:
1387                 tsi->tsi_reply_fail_id = OBD_FAIL_OST_LDLM_REPLY_NET;
1388                 break;
1389         case LUT_FAIL_MGT:
1390                 tsi->tsi_reply_fail_id = OBD_FAIL_MGS_LDLM_REPLY_NET;
1391                 break;
1392         default:
1393                 tsi->tsi_reply_fail_id = OBD_FAIL_LDLM_REPLY;
1394                 break;
1395         }
1396         RETURN(req->rq_status);
1397 }
1398 EXPORT_SYMBOL(tgt_enqueue);
1399
1400 int tgt_convert(struct tgt_session_info *tsi)
1401 {
1402         struct ptlrpc_request *req = tgt_ses_req(tsi);
1403         int rc;
1404
1405         ENTRY;
1406         LASSERT(tsi->tsi_dlm_req);
1407         rc = ldlm_handle_convert0(req, tsi->tsi_dlm_req);
1408         if (rc)
1409                 RETURN(err_serious(rc));
1410
1411         RETURN(req->rq_status);
1412 }
1413
1414 int tgt_bl_callback(struct tgt_session_info *tsi)
1415 {
1416         return err_serious(-EOPNOTSUPP);
1417 }
1418
1419 int tgt_cp_callback(struct tgt_session_info *tsi)
1420 {
1421         return err_serious(-EOPNOTSUPP);
1422 }
1423
1424 /* generic LDLM target handler */
1425 struct tgt_handler tgt_dlm_handlers[] = {
1426 TGT_DLM_HDL    (HABEO_CLAVIS,   LDLM_ENQUEUE,           tgt_enqueue),
1427 TGT_DLM_HDL_VAR(HABEO_CLAVIS,   LDLM_CONVERT,           tgt_convert),
1428 TGT_DLM_HDL_VAR(0,              LDLM_BL_CALLBACK,       tgt_bl_callback),
1429 TGT_DLM_HDL_VAR(0,              LDLM_CP_CALLBACK,       tgt_cp_callback)
1430 };
1431 EXPORT_SYMBOL(tgt_dlm_handlers);
1432
1433 /*
1434  * Unified target LLOG handlers.
1435  */
1436 int tgt_llog_open(struct tgt_session_info *tsi)
1437 {
1438         int rc;
1439
1440         ENTRY;
1441
1442         rc = llog_origin_handle_open(tgt_ses_req(tsi));
1443
1444         RETURN(rc);
1445 }
1446 EXPORT_SYMBOL(tgt_llog_open);
1447
1448 int tgt_llog_close(struct tgt_session_info *tsi)
1449 {
1450         int rc;
1451
1452         ENTRY;
1453
1454         rc = llog_origin_handle_close(tgt_ses_req(tsi));
1455
1456         RETURN(rc);
1457 }
1458 EXPORT_SYMBOL(tgt_llog_close);
1459
1460
1461 int tgt_llog_destroy(struct tgt_session_info *tsi)
1462 {
1463         int rc;
1464
1465         ENTRY;
1466
1467         rc = llog_origin_handle_destroy(tgt_ses_req(tsi));
1468
1469         RETURN(rc);
1470 }
1471
1472 int tgt_llog_read_header(struct tgt_session_info *tsi)
1473 {
1474         int rc;
1475
1476         ENTRY;
1477
1478         rc = llog_origin_handle_read_header(tgt_ses_req(tsi));
1479
1480         RETURN(rc);
1481 }
1482 EXPORT_SYMBOL(tgt_llog_read_header);
1483
1484 int tgt_llog_next_block(struct tgt_session_info *tsi)
1485 {
1486         int rc;
1487
1488         ENTRY;
1489
1490         rc = llog_origin_handle_next_block(tgt_ses_req(tsi));
1491
1492         RETURN(rc);
1493 }
1494 EXPORT_SYMBOL(tgt_llog_next_block);
1495
1496 int tgt_llog_prev_block(struct tgt_session_info *tsi)
1497 {
1498         int rc;
1499
1500         ENTRY;
1501
1502         rc = llog_origin_handle_prev_block(tgt_ses_req(tsi));
1503
1504         RETURN(rc);
1505 }
1506 EXPORT_SYMBOL(tgt_llog_prev_block);
1507
1508 /* generic llog target handler */
1509 struct tgt_handler tgt_llog_handlers[] = {
1510 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_CREATE,      tgt_llog_open),
1511 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_NEXT_BLOCK,  tgt_llog_next_block),
1512 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_READ_HEADER, tgt_llog_read_header),
1513 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_PREV_BLOCK,  tgt_llog_prev_block),
1514 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_DESTROY,     tgt_llog_destroy),
1515 TGT_LLOG_HDL_VAR(0,     LLOG_ORIGIN_HANDLE_CLOSE,       tgt_llog_close),
1516 };
1517 EXPORT_SYMBOL(tgt_llog_handlers);
1518
1519 /*
1520  * sec context handlers
1521  */
1522 /* XXX: Implement based on mdt_sec_ctx_handle()? */
1523 static int tgt_sec_ctx_handle(struct tgt_session_info *tsi)
1524 {
1525         return 0;
1526 }
1527
1528 struct tgt_handler tgt_sec_ctx_handlers[] = {
1529 TGT_SEC_HDL_VAR(0,      SEC_CTX_INIT,           tgt_sec_ctx_handle),
1530 TGT_SEC_HDL_VAR(0,      SEC_CTX_INIT_CONT,      tgt_sec_ctx_handle),
1531 TGT_SEC_HDL_VAR(0,      SEC_CTX_FINI,           tgt_sec_ctx_handle),
1532 };
1533 EXPORT_SYMBOL(tgt_sec_ctx_handlers);
1534
1535 int (*tgt_lfsck_in_notify)(const struct lu_env *env,
1536                            struct dt_device *key,
1537                            struct lfsck_request *lr,
1538                            struct thandle *th) = NULL;
1539
1540 void tgt_register_lfsck_in_notify(int (*notify)(const struct lu_env *,
1541                                                 struct dt_device *,
1542                                                 struct lfsck_request *,
1543                                                 struct thandle *))
1544 {
1545         tgt_lfsck_in_notify = notify;
1546 }
1547 EXPORT_SYMBOL(tgt_register_lfsck_in_notify);
1548
1549 static int (*tgt_lfsck_query)(const struct lu_env *env,
1550                               struct dt_device *key,
1551                               struct lfsck_request *lr) = NULL;
1552
1553 void tgt_register_lfsck_query(int (*query)(const struct lu_env *,
1554                                            struct dt_device *,
1555                                            struct lfsck_request *))
1556 {
1557         tgt_lfsck_query = query;
1558 }
1559 EXPORT_SYMBOL(tgt_register_lfsck_query);
1560
1561 /* LFSCK request handlers */
1562 static int tgt_handle_lfsck_notify(struct tgt_session_info *tsi)
1563 {
1564         const struct lu_env     *env = tsi->tsi_env;
1565         struct dt_device        *key = tsi->tsi_tgt->lut_bottom;
1566         struct lfsck_request    *lr;
1567         int                      rc;
1568         ENTRY;
1569
1570         lr = req_capsule_client_get(tsi->tsi_pill, &RMF_LFSCK_REQUEST);
1571         if (lr == NULL)
1572                 RETURN(-EPROTO);
1573
1574         rc = tgt_lfsck_in_notify(env, key, lr, NULL);
1575
1576         RETURN(rc);
1577 }
1578
1579 static int tgt_handle_lfsck_query(struct tgt_session_info *tsi)
1580 {
1581         struct lfsck_request    *request;
1582         struct lfsck_reply      *reply;
1583         int                      rc;
1584         ENTRY;
1585
1586         request = req_capsule_client_get(tsi->tsi_pill, &RMF_LFSCK_REQUEST);
1587         if (request == NULL)
1588                 RETURN(-EPROTO);
1589
1590         reply = req_capsule_server_get(tsi->tsi_pill, &RMF_LFSCK_REPLY);
1591         if (reply == NULL)
1592                 RETURN(-ENOMEM);
1593
1594         rc = tgt_lfsck_query(tsi->tsi_env, tsi->tsi_tgt->lut_bottom, request);
1595         reply->lr_status = rc;
1596
1597         RETURN(rc < 0 ? rc : 0);
1598 }
1599
1600 struct tgt_handler tgt_lfsck_handlers[] = {
1601 TGT_LFSCK_HDL(HABEO_REFERO,     LFSCK_NOTIFY,   tgt_handle_lfsck_notify),
1602 TGT_LFSCK_HDL(HABEO_REFERO,     LFSCK_QUERY,    tgt_handle_lfsck_query),
1603 };
1604 EXPORT_SYMBOL(tgt_lfsck_handlers);
1605
1606 /*
1607  * initialize per-thread page pool (bug 5137).
1608  */
1609 int tgt_io_thread_init(struct ptlrpc_thread *thread)
1610 {
1611         struct tgt_thread_big_cache *tbc;
1612
1613         ENTRY;
1614
1615         LASSERT(thread != NULL);
1616         LASSERT(thread->t_data == NULL);
1617
1618         OBD_ALLOC_LARGE(tbc, sizeof(*tbc));
1619         if (tbc == NULL)
1620                 RETURN(-ENOMEM);
1621         thread->t_data = tbc;
1622         RETURN(0);
1623 }
1624 EXPORT_SYMBOL(tgt_io_thread_init);
1625
1626 /*
1627  * free per-thread pool created by tgt_thread_init().
1628  */
1629 void tgt_io_thread_done(struct ptlrpc_thread *thread)
1630 {
1631         struct tgt_thread_big_cache *tbc;
1632
1633         ENTRY;
1634
1635         LASSERT(thread != NULL);
1636
1637         /*
1638          * be prepared to handle partially-initialized pools (because this is
1639          * called from ost_io_thread_init() for cleanup.
1640          */
1641         tbc = thread->t_data;
1642         if (tbc != NULL) {
1643                 OBD_FREE_LARGE(tbc, sizeof(*tbc));
1644                 thread->t_data = NULL;
1645         }
1646         EXIT;
1647 }
1648 EXPORT_SYMBOL(tgt_io_thread_done);
1649 /**
1650  * Helper function for getting server side [start, start+count] DLM lock
1651  * if asked by client.
1652  */
1653 int tgt_extent_lock(struct ldlm_namespace *ns, struct ldlm_res_id *res_id,
1654                     __u64 start, __u64 end, struct lustre_handle *lh,
1655                     int mode, __u64 *flags)
1656 {
1657         union ldlm_policy_data policy;
1658         int rc;
1659
1660         ENTRY;
1661
1662         LASSERT(lh != NULL);
1663         LASSERT(ns != NULL);
1664         LASSERT(!lustre_handle_is_used(lh));
1665
1666         policy.l_extent.gid = 0;
1667         policy.l_extent.start = start & PAGE_MASK;
1668
1669         /*
1670          * If ->o_blocks is EOF it means "lock till the end of the file".
1671          * Otherwise, it's size of an extent or hole being punched (in bytes).
1672          */
1673         if (end == OBD_OBJECT_EOF || end < start)
1674                 policy.l_extent.end = OBD_OBJECT_EOF;
1675         else
1676                 policy.l_extent.end = end | ~PAGE_MASK;
1677
1678         rc = ldlm_cli_enqueue_local(ns, res_id, LDLM_EXTENT, &policy, mode,
1679                                     flags, ldlm_blocking_ast,
1680                                     ldlm_completion_ast, ldlm_glimpse_ast,
1681                                     NULL, 0, LVB_T_NONE, NULL, lh);
1682         RETURN(rc == ELDLM_OK ? 0 : -EIO);
1683 }
1684 EXPORT_SYMBOL(tgt_extent_lock);
1685
1686 void tgt_extent_unlock(struct lustre_handle *lh, enum ldlm_mode mode)
1687 {
1688         LASSERT(lustre_handle_is_used(lh));
1689         ldlm_lock_decref(lh, mode);
1690 }
1691 EXPORT_SYMBOL(tgt_extent_unlock);
1692
1693 int tgt_brw_lock(struct ldlm_namespace *ns, struct ldlm_res_id *res_id,
1694                  struct obd_ioobj *obj, struct niobuf_remote *nb,
1695                  struct lustre_handle *lh, enum ldlm_mode mode)
1696 {
1697         __u64                    flags = 0;
1698         int                      nrbufs = obj->ioo_bufcnt;
1699         int                      i;
1700
1701         ENTRY;
1702
1703         LASSERT(mode == LCK_PR || mode == LCK_PW);
1704         LASSERT(!lustre_handle_is_used(lh));
1705
1706         if (nrbufs == 0 || !(nb[0].rnb_flags & OBD_BRW_SRVLOCK))
1707                 RETURN(0);
1708
1709         for (i = 1; i < nrbufs; i++)
1710                 if (!(nb[i].rnb_flags & OBD_BRW_SRVLOCK))
1711                         RETURN(-EFAULT);
1712
1713         RETURN(tgt_extent_lock(ns, res_id, nb[0].rnb_offset,
1714                                nb[nrbufs - 1].rnb_offset +
1715                                nb[nrbufs - 1].rnb_len - 1,
1716                                lh, mode, &flags));
1717 }
1718
1719 void tgt_brw_unlock(struct obd_ioobj *obj, struct niobuf_remote *niob,
1720                     struct lustre_handle *lh, enum ldlm_mode mode)
1721 {
1722         ENTRY;
1723
1724         LASSERT(mode == LCK_PR || mode == LCK_PW);
1725         LASSERT((obj->ioo_bufcnt > 0 &&
1726                  (niob[0].rnb_flags & OBD_BRW_SRVLOCK)) ==
1727                 lustre_handle_is_used(lh));
1728
1729         if (lustre_handle_is_used(lh))
1730                 tgt_extent_unlock(lh, mode);
1731         EXIT;
1732 }
1733
1734 static __u32 tgt_checksum_bulk(struct lu_target *tgt,
1735                                struct ptlrpc_bulk_desc *desc, int opc,
1736                                cksum_type_t cksum_type)
1737 {
1738         struct cfs_crypto_hash_desc     *hdesc;
1739         unsigned int                    bufsize;
1740         int                             i, err;
1741         unsigned char                   cfs_alg = cksum_obd2cfs(cksum_type);
1742         __u32                           cksum;
1743
1744         LASSERT(ptlrpc_is_bulk_desc_kiov(desc->bd_type));
1745
1746         hdesc = cfs_crypto_hash_init(cfs_alg, NULL, 0);
1747         if (IS_ERR(hdesc)) {
1748                 CERROR("%s: unable to initialize checksum hash %s\n",
1749                        tgt_name(tgt), cfs_crypto_hash_name(cfs_alg));
1750                 return PTR_ERR(hdesc);
1751         }
1752
1753         CDEBUG(D_INFO, "Checksum for algo %s\n", cfs_crypto_hash_name(cfs_alg));
1754         for (i = 0; i < desc->bd_iov_count; i++) {
1755                 /* corrupt the data before we compute the checksum, to
1756                  * simulate a client->OST data error */
1757                 if (i == 0 && opc == OST_WRITE &&
1758                     OBD_FAIL_CHECK(OBD_FAIL_OST_CHECKSUM_RECEIVE)) {
1759                         int off = BD_GET_KIOV(desc, i).kiov_offset &
1760                                 ~PAGE_MASK;
1761                         int len = BD_GET_KIOV(desc, i).kiov_len;
1762                         struct page *np = tgt_page_to_corrupt;
1763                         char *ptr = kmap(BD_GET_KIOV(desc, i).kiov_page) + off;
1764
1765                         if (np) {
1766                                 char *ptr2 = kmap(np) + off;
1767
1768                                 memcpy(ptr2, ptr, len);
1769                                 memcpy(ptr2, "bad3", min(4, len));
1770                                 kunmap(np);
1771                                 BD_GET_KIOV(desc, i).kiov_page = np;
1772                         } else {
1773                                 CERROR("%s: can't alloc page for corruption\n",
1774                                        tgt_name(tgt));
1775                         }
1776                 }
1777                 cfs_crypto_hash_update_page(hdesc,
1778                                   BD_GET_KIOV(desc, i).kiov_page,
1779                                   BD_GET_KIOV(desc, i).kiov_offset &
1780                                         ~PAGE_MASK,
1781                                   BD_GET_KIOV(desc, i).kiov_len);
1782
1783                  /* corrupt the data after we compute the checksum, to
1784                  * simulate an OST->client data error */
1785                 if (i == 0 && opc == OST_READ &&
1786                     OBD_FAIL_CHECK(OBD_FAIL_OST_CHECKSUM_SEND)) {
1787                         int off = BD_GET_KIOV(desc, i).kiov_offset
1788                           & ~PAGE_MASK;
1789                         int len = BD_GET_KIOV(desc, i).kiov_len;
1790                         struct page *np = tgt_page_to_corrupt;
1791                         char *ptr =
1792                           kmap(BD_GET_KIOV(desc, i).kiov_page) + off;
1793
1794                         if (np) {
1795                                 char *ptr2 = kmap(np) + off;
1796
1797                                 memcpy(ptr2, ptr, len);
1798                                 memcpy(ptr2, "bad4", min(4, len));
1799                                 kunmap(np);
1800                                 BD_GET_KIOV(desc, i).kiov_page = np;
1801                         } else {
1802                                 CERROR("%s: can't alloc page for corruption\n",
1803                                        tgt_name(tgt));
1804                         }
1805                 }
1806         }
1807
1808         bufsize = sizeof(cksum);
1809         err = cfs_crypto_hash_final(hdesc, (unsigned char *)&cksum, &bufsize);
1810
1811         return cksum;
1812 }
1813
1814 int tgt_brw_read(struct tgt_session_info *tsi)
1815 {
1816         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1817         struct ptlrpc_bulk_desc *desc = NULL;
1818         struct obd_export       *exp = tsi->tsi_exp;
1819         struct niobuf_remote    *remote_nb;
1820         struct niobuf_local     *local_nb;
1821         struct obd_ioobj        *ioo;
1822         struct ost_body         *body, *repbody;
1823         struct l_wait_info       lwi;
1824         struct lustre_handle     lockh = { 0 };
1825         int                      npages, nob = 0, rc, i, no_reply = 0;
1826         struct tgt_thread_big_cache *tbc = req->rq_svc_thread->t_data;
1827
1828         ENTRY;
1829
1830         if (ptlrpc_req2svc(req)->srv_req_portal != OST_IO_PORTAL) {
1831                 CERROR("%s: deny read request from %s to portal %u\n",
1832                        tgt_name(tsi->tsi_tgt),
1833                        obd_export_nid2str(req->rq_export),
1834                        ptlrpc_req2svc(req)->srv_req_portal);
1835                 RETURN(-EPROTO);
1836         }
1837
1838         req->rq_bulk_read = 1;
1839
1840         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_READ_BULK))
1841                 RETURN(-EIO);
1842
1843         OBD_FAIL_TIMEOUT(OBD_FAIL_OST_BRW_PAUSE_BULK, cfs_fail_val > 0 ?
1844                          cfs_fail_val : (obd_timeout + 1) / 4);
1845
1846         /* Check if there is eviction in progress, and if so, wait for it to
1847          * finish */
1848         if (unlikely(atomic_read(&exp->exp_obd->obd_evict_inprogress))) {
1849                 /* We do not care how long it takes */
1850                 lwi = LWI_INTR(NULL, NULL);
1851                 rc = l_wait_event(exp->exp_obd->obd_evict_inprogress_waitq,
1852                          !atomic_read(&exp->exp_obd->obd_evict_inprogress),
1853                          &lwi);
1854         }
1855
1856         /* There must be big cache in current thread to process this request
1857          * if it is NULL then something went wrong and it wasn't allocated,
1858          * report -ENOMEM in that case */
1859         if (tbc == NULL)
1860                 RETURN(-ENOMEM);
1861
1862         body = tsi->tsi_ost_body;
1863         LASSERT(body != NULL);
1864
1865         ioo = req_capsule_client_get(tsi->tsi_pill, &RMF_OBD_IOOBJ);
1866         LASSERT(ioo != NULL); /* must exists after tgt_ost_body_unpack */
1867
1868         remote_nb = req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE);
1869         LASSERT(remote_nb != NULL); /* must exists after tgt_ost_body_unpack */
1870
1871         local_nb = tbc->local;
1872
1873         rc = tgt_brw_lock(exp->exp_obd->obd_namespace, &tsi->tsi_resid, ioo,
1874                           remote_nb, &lockh, LCK_PR);
1875         if (rc != 0)
1876                 RETURN(rc);
1877
1878         /*
1879          * If getting the lock took more time than
1880          * client was willing to wait, drop it. b=11330
1881          */
1882         if (cfs_time_current_sec() > req->rq_deadline ||
1883             OBD_FAIL_CHECK(OBD_FAIL_OST_DROP_REQ)) {
1884                 no_reply = 1;
1885                 CERROR("Dropping timed-out read from %s because locking"
1886                        "object "DOSTID" took %ld seconds (limit was %ld).\n",
1887                        libcfs_id2str(req->rq_peer), POSTID(&ioo->ioo_oid),
1888                        cfs_time_current_sec() - req->rq_arrival_time.tv_sec,
1889                        req->rq_deadline - req->rq_arrival_time.tv_sec);
1890                 GOTO(out_lock, rc = -ETIMEDOUT);
1891         }
1892
1893         repbody = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
1894         repbody->oa = body->oa;
1895
1896         npages = PTLRPC_MAX_BRW_PAGES;
1897         rc = obd_preprw(tsi->tsi_env, OBD_BRW_READ, exp, &repbody->oa, 1,
1898                         ioo, remote_nb, &npages, local_nb);
1899         if (rc != 0)
1900                 GOTO(out_lock, rc);
1901
1902         desc = ptlrpc_prep_bulk_exp(req, npages, ioobj_max_brw_get(ioo),
1903                                     PTLRPC_BULK_PUT_SOURCE |
1904                                         PTLRPC_BULK_BUF_KIOV,
1905                                     OST_BULK_PORTAL,
1906                                     &ptlrpc_bulk_kiov_nopin_ops);
1907         if (desc == NULL)
1908                 GOTO(out_commitrw, rc = -ENOMEM);
1909
1910         nob = 0;
1911         for (i = 0; i < npages; i++) {
1912                 int page_rc = local_nb[i].lnb_rc;
1913
1914                 if (page_rc < 0) {
1915                         rc = page_rc;
1916                         break;
1917                 }
1918
1919                 nob += page_rc;
1920                 if (page_rc != 0) { /* some data! */
1921                         LASSERT(local_nb[i].lnb_page != NULL);
1922                         desc->bd_frag_ops->add_kiov_frag
1923                           (desc, local_nb[i].lnb_page,
1924                            local_nb[i].lnb_page_offset,
1925                            page_rc);
1926                 }
1927
1928                 if (page_rc != local_nb[i].lnb_len) { /* short read */
1929                         /* All subsequent pages should be 0 */
1930                         while (++i < npages)
1931                                 LASSERT(local_nb[i].lnb_rc == 0);
1932                         break;
1933                 }
1934         }
1935         if (OBD_FAIL_CHECK(OBD_FAIL_OST_READ_SIZE) &&
1936             nob != cfs_fail_val)
1937                 rc = -E2BIG;
1938
1939         if (body->oa.o_valid & OBD_MD_FLCKSUM) {
1940                 cksum_type_t cksum_type =
1941                         cksum_type_unpack(body->oa.o_valid & OBD_MD_FLFLAGS ?
1942                                           body->oa.o_flags : 0);
1943                 repbody->oa.o_flags = cksum_type_pack(cksum_type);
1944                 repbody->oa.o_valid = OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1945                 repbody->oa.o_cksum = tgt_checksum_bulk(tsi->tsi_tgt, desc,
1946                                                         OST_READ, cksum_type);
1947                 CDEBUG(D_PAGE, "checksum at read origin: %x\n",
1948                        repbody->oa.o_cksum);
1949         } else {
1950                 repbody->oa.o_valid = 0;
1951         }
1952         /* We're finishing using body->oa as an input variable */
1953
1954         /* Check if client was evicted while we were doing i/o before touching
1955          * network */
1956         if (likely(rc == 0 &&
1957                    !CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2))) {
1958                 rc = target_bulk_io(exp, desc, &lwi);
1959                 no_reply = rc != 0;
1960         }
1961
1962 out_commitrw:
1963         /* Must commit after prep above in all cases */
1964         rc = obd_commitrw(tsi->tsi_env, OBD_BRW_READ, exp, &repbody->oa, 1, ioo,
1965                           remote_nb, npages, local_nb, rc);
1966         if (rc == 0)
1967                 tgt_drop_id(exp, &repbody->oa);
1968 out_lock:
1969         tgt_brw_unlock(ioo, remote_nb, &lockh, LCK_PR);
1970
1971         if (desc && !CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2))
1972                 ptlrpc_free_bulk(desc);
1973
1974         LASSERT(rc <= 0);
1975         if (rc == 0) {
1976                 rc = nob;
1977                 ptlrpc_lprocfs_brw(req, nob);
1978         } else if (no_reply) {
1979                 req->rq_no_reply = 1;
1980                 /* reply out callback would free */
1981                 ptlrpc_req_drop_rs(req);
1982                 LCONSOLE_WARN("%s: Bulk IO read error with %s (at %s), "
1983                               "client will retry: rc %d\n",
1984                               exp->exp_obd->obd_name,
1985                               obd_uuid2str(&exp->exp_client_uuid),
1986                               obd_export_nid2str(exp), rc);
1987         }
1988         /* send a bulk after reply to simulate a network delay or reordering
1989          * by a router */
1990         if (unlikely(CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2))) {
1991                 wait_queue_head_t        waitq;
1992                 struct l_wait_info       lwi1;
1993
1994                 CDEBUG(D_INFO, "reorder BULK\n");
1995                 init_waitqueue_head(&waitq);
1996
1997                 lwi1 = LWI_TIMEOUT_INTR(cfs_time_seconds(3), NULL, NULL, NULL);
1998                 l_wait_event(waitq, 0, &lwi1);
1999                 target_bulk_io(exp, desc, &lwi);
2000                 ptlrpc_free_bulk(desc);
2001         }
2002
2003         RETURN(rc);
2004 }
2005 EXPORT_SYMBOL(tgt_brw_read);
2006
2007 static void tgt_warn_on_cksum(struct ptlrpc_request *req,
2008                               struct ptlrpc_bulk_desc *desc,
2009                               struct niobuf_local *local_nb, int npages,
2010                               u32 client_cksum, u32 server_cksum,
2011                               bool mmap)
2012 {
2013         struct obd_export *exp = req->rq_export;
2014         struct ost_body *body;
2015         char *router = "";
2016         char *via = "";
2017
2018         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
2019         LASSERT(body != NULL);
2020
2021         if (req->rq_peer.nid != desc->bd_sender) {
2022                 via = " via ";
2023                 router = libcfs_nid2str(desc->bd_sender);
2024         }
2025
2026         if (mmap) {
2027                 CDEBUG_LIMIT(D_INFO, "client csum %x, server csum %x\n",
2028                              client_cksum, server_cksum);
2029                 return;
2030         }
2031
2032         LCONSOLE_ERROR_MSG(0x168, "BAD WRITE CHECKSUM: %s from %s%s%s inode "
2033                            DFID" object "DOSTID" extent ["LPU64"-"LPU64
2034                            "]: client csum %x, server csum %x\n",
2035                            exp->exp_obd->obd_name, libcfs_id2str(req->rq_peer),
2036                            via, router,
2037                            body->oa.o_valid & OBD_MD_FLFID ?
2038                            body->oa.o_parent_seq : (__u64)0,
2039                            body->oa.o_valid & OBD_MD_FLFID ?
2040                            body->oa.o_parent_oid : 0,
2041                            body->oa.o_valid & OBD_MD_FLFID ?
2042                            body->oa.o_parent_ver : 0,
2043                            POSTID(&body->oa.o_oi),
2044                            local_nb[0].lnb_file_offset,
2045                            local_nb[npages-1].lnb_file_offset +
2046                            local_nb[npages - 1].lnb_len - 1,
2047                            client_cksum, server_cksum);
2048 }
2049
2050 int tgt_brw_write(struct tgt_session_info *tsi)
2051 {
2052         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2053         struct ptlrpc_bulk_desc *desc = NULL;
2054         struct obd_export       *exp = req->rq_export;
2055         struct niobuf_remote    *remote_nb;
2056         struct niobuf_local     *local_nb;
2057         struct obd_ioobj        *ioo;
2058         struct ost_body         *body, *repbody;
2059         struct l_wait_info       lwi;
2060         struct lustre_handle     lockh = {0};
2061         __u32                   *rcs;
2062         int                      objcount, niocount, npages;
2063         int                      rc, i, j;
2064         cksum_type_t             cksum_type = OBD_CKSUM_CRC32;
2065         bool                     no_reply = false, mmap;
2066         struct tgt_thread_big_cache *tbc = req->rq_svc_thread->t_data;
2067
2068         ENTRY;
2069
2070         if (ptlrpc_req2svc(req)->srv_req_portal != OST_IO_PORTAL) {
2071                 CERROR("%s: deny write request from %s to portal %u\n",
2072                        tgt_name(tsi->tsi_tgt),
2073                        obd_export_nid2str(req->rq_export),
2074                        ptlrpc_req2svc(req)->srv_req_portal);
2075                 RETURN(err_serious(-EPROTO));
2076         }
2077
2078         if (OBD_FAIL_CHECK(OBD_FAIL_OST_ENOSPC))
2079                 RETURN(err_serious(-ENOSPC));
2080         if (OBD_FAIL_TIMEOUT(OBD_FAIL_OST_EROFS, 1))
2081                 RETURN(err_serious(-EROFS));
2082
2083         req->rq_bulk_write = 1;
2084
2085         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_WRITE_BULK))
2086                 RETURN(err_serious(-EIO));
2087         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_WRITE_BULK2))
2088                 RETURN(err_serious(-EFAULT));
2089
2090         /* pause before transaction has been started */
2091         CFS_FAIL_TIMEOUT(OBD_FAIL_OST_BRW_PAUSE_BULK, cfs_fail_val > 0 ?
2092                          cfs_fail_val : (obd_timeout + 1) / 4);
2093
2094         /* There must be big cache in current thread to process this request
2095          * if it is NULL then something went wrong and it wasn't allocated,
2096          * report -ENOMEM in that case */
2097         if (tbc == NULL)
2098                 RETURN(-ENOMEM);
2099
2100         body = tsi->tsi_ost_body;
2101         LASSERT(body != NULL);
2102
2103         ioo = req_capsule_client_get(&req->rq_pill, &RMF_OBD_IOOBJ);
2104         LASSERT(ioo != NULL); /* must exists after tgt_ost_body_unpack */
2105
2106         objcount = req_capsule_get_size(&req->rq_pill, &RMF_OBD_IOOBJ,
2107                                         RCL_CLIENT) / sizeof(*ioo);
2108
2109         for (niocount = i = 0; i < objcount; i++)
2110                 niocount += ioo[i].ioo_bufcnt;
2111
2112         remote_nb = req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE);
2113         LASSERT(remote_nb != NULL); /* must exists after tgt_ost_body_unpack */
2114         if (niocount != req_capsule_get_size(&req->rq_pill,
2115                                              &RMF_NIOBUF_REMOTE, RCL_CLIENT) /
2116                         sizeof(*remote_nb))
2117                 RETURN(err_serious(-EPROTO));
2118
2119         if ((remote_nb[0].rnb_flags & OBD_BRW_MEMALLOC) &&
2120             (exp->exp_connection->c_peer.nid == exp->exp_connection->c_self))
2121                 memory_pressure_set();
2122
2123         req_capsule_set_size(&req->rq_pill, &RMF_RCS, RCL_SERVER,
2124                              niocount * sizeof(*rcs));
2125         rc = req_capsule_server_pack(&req->rq_pill);
2126         if (rc != 0)
2127                 GOTO(out, rc = err_serious(rc));
2128
2129         CFS_FAIL_TIMEOUT(OBD_FAIL_OST_BRW_PAUSE_PACK, cfs_fail_val);
2130         rcs = req_capsule_server_get(&req->rq_pill, &RMF_RCS);
2131
2132         local_nb = tbc->local;
2133
2134         rc = tgt_brw_lock(exp->exp_obd->obd_namespace, &tsi->tsi_resid, ioo,
2135                           remote_nb, &lockh, LCK_PW);
2136         if (rc != 0)
2137                 GOTO(out, rc);
2138
2139         /*
2140          * If getting the lock took more time than
2141          * client was willing to wait, drop it. b=11330
2142          */
2143         if (cfs_time_current_sec() > req->rq_deadline ||
2144             OBD_FAIL_CHECK(OBD_FAIL_OST_DROP_REQ)) {
2145                 no_reply = true;
2146                 CERROR("%s: Dropping timed-out write from %s because locking "
2147                        "object "DOSTID" took %ld seconds (limit was %ld).\n",
2148                        tgt_name(tsi->tsi_tgt), libcfs_id2str(req->rq_peer),
2149                        POSTID(&ioo->ioo_oid),
2150                        cfs_time_current_sec() - req->rq_arrival_time.tv_sec,
2151                        req->rq_deadline - req->rq_arrival_time.tv_sec);
2152                 GOTO(out_lock, rc = -ETIMEDOUT);
2153         }
2154
2155         /* Because we already sync grant info with client when reconnect,
2156          * grant info will be cleared for resent req, then fed_grant and
2157          * total_grant will not be modified in following preprw_write */
2158         if (lustre_msg_get_flags(req->rq_reqmsg) & (MSG_RESENT | MSG_REPLAY)) {
2159                 DEBUG_REQ(D_CACHE, req, "clear resent/replay req grant info");
2160                 body->oa.o_valid &= ~OBD_MD_FLGRANT;
2161         }
2162
2163         repbody = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
2164         if (repbody == NULL)
2165                 GOTO(out_lock, rc = -ENOMEM);
2166         repbody->oa = body->oa;
2167
2168         npages = PTLRPC_MAX_BRW_PAGES;
2169         rc = obd_preprw(tsi->tsi_env, OBD_BRW_WRITE, exp, &repbody->oa,
2170                         objcount, ioo, remote_nb, &npages, local_nb);
2171         if (rc < 0)
2172                 GOTO(out_lock, rc);
2173
2174         desc = ptlrpc_prep_bulk_exp(req, npages, ioobj_max_brw_get(ioo),
2175                                     PTLRPC_BULK_GET_SINK | PTLRPC_BULK_BUF_KIOV,
2176                                     OST_BULK_PORTAL,
2177                                     &ptlrpc_bulk_kiov_nopin_ops);
2178         if (desc == NULL)
2179                 GOTO(skip_transfer, rc = -ENOMEM);
2180
2181         /* NB Having prepped, we must commit... */
2182         for (i = 0; i < npages; i++)
2183                 desc->bd_frag_ops->add_kiov_frag(desc,
2184                                                  local_nb[i].lnb_page,
2185                                                  local_nb[i].lnb_page_offset,
2186                                                  local_nb[i].lnb_len);
2187
2188         rc = sptlrpc_svc_prep_bulk(req, desc);
2189         if (rc != 0)
2190                 GOTO(skip_transfer, rc);
2191
2192         rc = target_bulk_io(exp, desc, &lwi);
2193         no_reply = rc != 0;
2194
2195 skip_transfer:
2196         if (body->oa.o_valid & OBD_MD_FLCKSUM && rc == 0) {
2197                 static int cksum_counter;
2198
2199                 if (body->oa.o_valid & OBD_MD_FLFLAGS)
2200                         cksum_type = cksum_type_unpack(body->oa.o_flags);
2201
2202                 repbody->oa.o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
2203                 repbody->oa.o_flags &= ~OBD_FL_CKSUM_ALL;
2204                 repbody->oa.o_flags |= cksum_type_pack(cksum_type);
2205                 repbody->oa.o_cksum = tgt_checksum_bulk(tsi->tsi_tgt, desc,
2206                                                         OST_WRITE, cksum_type);
2207                 cksum_counter++;
2208
2209                 if (unlikely(body->oa.o_cksum != repbody->oa.o_cksum)) {
2210                         mmap = (body->oa.o_valid & OBD_MD_FLFLAGS &&
2211                                 body->oa.o_flags & OBD_FL_MMAP);
2212
2213                         tgt_warn_on_cksum(req, desc, local_nb, npages,
2214                                           body->oa.o_cksum,
2215                                           repbody->oa.o_cksum, mmap);
2216                         cksum_counter = 0;
2217                 } else if ((cksum_counter & (-cksum_counter)) ==
2218                            cksum_counter) {
2219                         CDEBUG(D_INFO, "Checksum %u from %s OK: %x\n",
2220                                cksum_counter, libcfs_id2str(req->rq_peer),
2221                                repbody->oa.o_cksum);
2222                 }
2223         }
2224
2225         /* Must commit after prep above in all cases */
2226         rc = obd_commitrw(tsi->tsi_env, OBD_BRW_WRITE, exp, &repbody->oa,
2227                           objcount, ioo, remote_nb, npages, local_nb, rc);
2228         if (rc == -ENOTCONN)
2229                 /* quota acquire process has been given up because
2230                  * either the client has been evicted or the client
2231                  * has timed out the request already */
2232                 no_reply = true;
2233
2234         /*
2235          * Disable sending mtime back to the client. If the client locked the
2236          * whole object, then it has already updated the mtime on its side,
2237          * otherwise it will have to glimpse anyway (see bug 21489, comment 32)
2238          */
2239         repbody->oa.o_valid &= ~(OBD_MD_FLMTIME | OBD_MD_FLATIME);
2240
2241         if (rc == 0) {
2242                 int nob = 0;
2243
2244                 /* set per-requested niobuf return codes */
2245                 for (i = j = 0; i < niocount; i++) {
2246                         int len = remote_nb[i].rnb_len;
2247
2248                         nob += len;
2249                         rcs[i] = 0;
2250                         do {
2251                                 LASSERT(j < npages);
2252                                 if (local_nb[j].lnb_rc < 0)
2253                                         rcs[i] = local_nb[j].lnb_rc;
2254                                 len -= local_nb[j].lnb_len;
2255                                 j++;
2256                         } while (len > 0);
2257                         LASSERT(len == 0);
2258                 }
2259                 LASSERT(j == npages);
2260                 ptlrpc_lprocfs_brw(req, nob);
2261
2262                 tgt_drop_id(exp, &repbody->oa);
2263         }
2264 out_lock:
2265         tgt_brw_unlock(ioo, remote_nb, &lockh, LCK_PW);
2266         if (desc)
2267                 ptlrpc_free_bulk(desc);
2268 out:
2269         if (no_reply) {
2270                 req->rq_no_reply = 1;
2271                 /* reply out callback would free */
2272                 ptlrpc_req_drop_rs(req);
2273                 LCONSOLE_WARN("%s: Bulk IO write error with %s (at %s), "
2274                               "client will retry: rc %d\n",
2275                               exp->exp_obd->obd_name,
2276                               obd_uuid2str(&exp->exp_client_uuid),
2277                               obd_export_nid2str(exp), rc);
2278         }
2279         memory_pressure_clr();
2280         RETURN(rc);
2281 }
2282 EXPORT_SYMBOL(tgt_brw_write);
2283
2284 /* Check if request can be reconstructed from saved reply data
2285  * A copy of the reply data is returned in @trd if the pointer is not NULL
2286  */
2287 bool req_can_reconstruct(struct ptlrpc_request *req,
2288                          struct tg_reply_data *trd)
2289 {
2290         struct tg_export_data *ted = &req->rq_export->exp_target_data;
2291         struct lsd_client_data *lcd = ted->ted_lcd;
2292         bool found;
2293
2294         if (tgt_is_multimodrpcs_client(req->rq_export))
2295                 return tgt_lookup_reply(req, trd);
2296
2297         mutex_lock(&ted->ted_lcd_lock);
2298         found = req->rq_xid == lcd->lcd_last_xid ||
2299                 req->rq_xid == lcd->lcd_last_close_xid;
2300
2301         if (found && trd != NULL) {
2302                 if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE) {
2303                         trd->trd_reply.lrd_xid = lcd->lcd_last_close_xid;
2304                         trd->trd_reply.lrd_transno =
2305                                                 lcd->lcd_last_close_transno;
2306                         trd->trd_reply.lrd_result = lcd->lcd_last_close_result;
2307                 } else {
2308                         trd->trd_reply.lrd_xid = lcd->lcd_last_xid;
2309                         trd->trd_reply.lrd_transno = lcd->lcd_last_transno;
2310                         trd->trd_reply.lrd_result = lcd->lcd_last_result;
2311                         trd->trd_reply.lrd_data = lcd->lcd_last_data;
2312                         trd->trd_pre_versions[0] = lcd->lcd_pre_versions[0];
2313                         trd->trd_pre_versions[1] = lcd->lcd_pre_versions[1];
2314                         trd->trd_pre_versions[2] = lcd->lcd_pre_versions[2];
2315                         trd->trd_pre_versions[3] = lcd->lcd_pre_versions[3];
2316                 }
2317         }
2318         mutex_unlock(&ted->ted_lcd_lock);
2319
2320         return found;
2321 }
2322 EXPORT_SYMBOL(req_can_reconstruct);
2323