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 int tgt_request_handle(struct ptlrpc_request *req)
 608 {
 609         struct tgt_session_info *tsi = tgt_ses_info(req->rq_svc_thread->t_env);
 610
 611         struct lustre_msg       *msg = req->rq_reqmsg;
 612         struct tgt_handler      *h;
 613         struct lu_target        *tgt;
 614         int                      request_fail_id = 0;
 615         __u32                    opc = lustre_msg_get_opc(msg);
 616         int                      rc;
 617
 618         ENTRY;
 619
 620         /* Refill the context, to make sure all thread keys are allocated */
 621         lu_env_refill(req->rq_svc_thread->t_env);
 622
 623         req_capsule_init(&req->rq_pill, req, RCL_SERVER);
 624         tsi->tsi_pill = &req->rq_pill;
 625         tsi->tsi_env = req->rq_svc_thread->t_env;
 626
 627         /* if request has export then get handlers slice from corresponding
 628          * target, otherwise that should be connect operation */
 629         if (opc == MDS_CONNECT || opc == OST_CONNECT ||
 630             opc == MGS_CONNECT) {
 631                 req_capsule_set(&req->rq_pill, &RQF_CONNECT);
 632                 rc = target_handle_connect(req);
 633                 if (rc != 0) {
 634                         rc = ptlrpc_error(req);
 635                         GOTO(out, rc);
 636                 }
 637                 /* recovery-small test 18c asks to drop connect reply */
 638                 if (unlikely(opc == OST_CONNECT &&
 639                              OBD_FAIL_CHECK(OBD_FAIL_OST_CONNECT_NET2)))
 640                         GOTO(out, rc = 0);
 641         }
 642
 643         if (unlikely(!class_connected_export(req->rq_export))) {
 644                 if (opc == SEC_CTX_INIT || opc == SEC_CTX_INIT_CONT ||
 645                     opc == SEC_CTX_FINI) {
 646                         /* sec context initialization has to be handled
 647                          * by hand in tgt_handle_request0() */
 648                         tsi->tsi_reply_fail_id = OBD_FAIL_SEC_CTX_INIT_NET;
 649                         h = NULL;
 650                         GOTO(handle_recov, rc = 0);
 651                 }
 652                 CDEBUG(D_HA, "operation %d on unconnected OST from %s\n",
 653                        opc, libcfs_id2str(req->rq_peer));
 654                 req->rq_status = -ENOTCONN;
 655                 rc = ptlrpc_error(req);
 656                 GOTO(out, rc);
 657         }
 658
 659         tsi->tsi_tgt = tgt = class_exp2tgt(req->rq_export);
 660         tsi->tsi_exp = req->rq_export;
 661         if (exp_connect_flags(req->rq_export) & OBD_CONNECT_JOBSTATS)
 662                 tsi->tsi_jobid = lustre_msg_get_jobid(req->rq_reqmsg);
 663         else
 664                 tsi->tsi_jobid = NULL;
 665
 666         if (tgt == NULL) {
 667                 DEBUG_REQ(D_ERROR, req, "%s: No target for connected export\n",
 668                           class_exp2obd(req->rq_export)->obd_name);
 669                 req->rq_status = -EINVAL;
 670                 rc = ptlrpc_error(req);
 671                 GOTO(out, rc);
 672         }
 673
 674         /* check request's xid is consistent with export's last_xid */
 675         if (req->rq_export != NULL) {
 676                 __u64 last_xid = lustre_msg_get_last_xid(req->rq_reqmsg);
 677                 if (last_xid != 0)
 678                         req->rq_export->exp_last_xid = last_xid;
 679                 if (req->rq_xid == 0 ||
 680                     req->rq_xid <= req->rq_export->exp_last_xid) {
 681                         DEBUG_REQ(D_ERROR, req,
 682                                   "Unexpected xid %llx vs. last_xid %llx\n",
 683                                   req->rq_xid, req->rq_export->exp_last_xid);
 684 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 7, 93, 0)
 685                         LBUG();
 686 #endif
 687                         req->rq_status = -EPROTO;
 688                         rc = ptlrpc_error(req);
 689                         GOTO(out, rc);
 690                 }
 691         }
 692
 693         request_fail_id = tgt->lut_request_fail_id;
 694         tsi->tsi_reply_fail_id = tgt->lut_reply_fail_id;
 695
 696         /* try to release in-memory reply data */
 697         if (tgt_is_multimodrpcs_client(req->rq_export)) {
 698                 tgt_handle_received_xid(req->rq_export,
 699                                 lustre_msg_get_last_xid(req->rq_reqmsg));
 700                 if (!(lustre_msg_get_flags(req->rq_reqmsg) &
 701                       (MSG_RESENT | MSG_REPLAY)))
 702                         tgt_handle_tag(req->rq_export,
 703                                        lustre_msg_get_tag(req->rq_reqmsg));
 704         }
 705
 706         h = tgt_handler_find_check(req);
 707         if (IS_ERR(h)) {
 708                 req->rq_status = PTR_ERR(h);
 709                 rc = ptlrpc_error(req);
 710                 GOTO(out, rc);
 711         }
 712
 713         LASSERTF(h->th_opc == opc, "opcode mismatch %d != %d\n",
 714                  h->th_opc, opc);
 715
 716         if (CFS_FAIL_CHECK_ORSET(request_fail_id, CFS_FAIL_ONCE))
 717                 GOTO(out, rc = 0);
 718
 719         rc = lustre_msg_check_version(msg, h->th_version);
 720         if (unlikely(rc)) {
 721                 DEBUG_REQ(D_ERROR, req, "%s: drop mal-formed request, version"
 722                           " %08x, expecting %08x\n", tgt_name(tgt),
 723                           lustre_msg_get_version(msg), h->th_version);
 724                 req->rq_status = -EINVAL;
 725                 rc = ptlrpc_error(req);
 726                 GOTO(out, rc);
 727         }
 728
 729 handle_recov:
 730         rc = tgt_handle_recovery(req, tsi->tsi_reply_fail_id);
 731         if (likely(rc == 1)) {
 732                 rc = tgt_handle_request0(tsi, h, req);
 733                 if (rc)
 734                         GOTO(out, rc);
 735         }
 736         EXIT;
 737 out:
 738         req_capsule_fini(tsi->tsi_pill);
 739         if (tsi->tsi_corpus != NULL) {
 740                 lu_object_put(tsi->tsi_env, tsi->tsi_corpus);
 741                 tsi->tsi_corpus = NULL;
 742         }
 743         return rc;
 744 }
 745 EXPORT_SYMBOL(tgt_request_handle);
 746
 747 /** Assign high priority operations to the request if needed. */
 748 int tgt_hpreq_handler(struct ptlrpc_request *req)
 749 {
 750         struct tgt_session_info *tsi = tgt_ses_info(req->rq_svc_thread->t_env);
 751         struct tgt_handler      *h;
 752         int                      rc;
 753
 754         ENTRY;
 755
 756         if (req->rq_export == NULL)
 757                 RETURN(0);
 758
 759         req_capsule_init(&req->rq_pill, req, RCL_SERVER);
 760         tsi->tsi_pill = &req->rq_pill;
 761         tsi->tsi_env = req->rq_svc_thread->t_env;
 762         tsi->tsi_tgt = class_exp2tgt(req->rq_export);
 763         tsi->tsi_exp = req->rq_export;
 764
 765         h = tgt_handler_find_check(req);
 766         if (IS_ERR(h)) {
 767                 rc = PTR_ERR(h);
 768                 RETURN(rc);
 769         }
 770
 771         rc = tgt_request_preprocess(tsi, h, req);
 772         if (unlikely(rc != 0))
 773                 RETURN(rc);
 774
 775         if (h->th_hp != NULL)
 776                 h->th_hp(tsi);
 777         RETURN(0);
 778 }
 779 EXPORT_SYMBOL(tgt_hpreq_handler);
 780
 781 void tgt_counter_incr(struct obd_export *exp, int opcode)
 782 {
 783         lprocfs_counter_incr(exp->exp_obd->obd_stats, opcode);
 784         if (exp->exp_nid_stats && exp->exp_nid_stats->nid_stats != NULL)
 785                 lprocfs_counter_incr(exp->exp_nid_stats->nid_stats, opcode);
 786 }
 787 EXPORT_SYMBOL(tgt_counter_incr);
 788
 789 /*
 790  * Unified target generic handlers.
 791  */
 792
 793 /*
 794  * Security functions
 795  */
 796 static inline void tgt_init_sec_none(struct obd_connect_data *reply)
 797 {
 798         reply->ocd_connect_flags &= ~(OBD_CONNECT_RMT_CLIENT |
 799                                       OBD_CONNECT_RMT_CLIENT_FORCE);
 800 }
 801
 802 static int tgt_init_sec_level(struct ptlrpc_request *req)
 803 {
 804         struct lu_target        *tgt = class_exp2tgt(req->rq_export);
 805         char                    *client;
 806         struct obd_connect_data *data, *reply;
 807         int                      rc = 0;
 808         bool                     remote;
 809         ENTRY;
 810
 811         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 812         reply = req_capsule_server_get(&req->rq_pill, &RMF_CONNECT_DATA);
 813         if (data == NULL || reply == NULL)
 814                 RETURN(-EFAULT);
 815
 816         /* connection from MDT is always trusted */
 817         if (req->rq_auth_usr_mdt) {
 818                 tgt_init_sec_none(reply);
 819                 RETURN(0);
 820         }
 821
 822         if (unlikely(tgt == NULL)) {
 823                 DEBUG_REQ(D_ERROR, req, "%s: No target for connected export\n",
 824                           class_exp2obd(req->rq_export)->obd_name);
 825                 RETURN(-EINVAL);
 826         }
 827
 828         client = libcfs_nid2str(req->rq_peer.nid);
 829         /* no GSS support case */
 830         if (!req->rq_auth_gss) {
 831                 if (tgt->lut_sec_level > LUSTRE_SEC_NONE) {
 832                         CWARN("client %s -> target %s does not use GSS, "
 833                               "can not run under security level %d.\n",
 834                               client, tgt_name(tgt), tgt->lut_sec_level);
 835                         RETURN(-EACCES);
 836                 } else {
 837                         tgt_init_sec_none(reply);
 838                         RETURN(0);
 839                 }
 840         }
 841
 842         /* old version case */
 843         if (unlikely(!(data->ocd_connect_flags & OBD_CONNECT_RMT_CLIENT) ||
 844                      !(data->ocd_connect_flags & OBD_CONNECT_MDS_CAPA) ||
 845                      !(data->ocd_connect_flags & OBD_CONNECT_OSS_CAPA))) {
 846                 if (tgt->lut_sec_level > LUSTRE_SEC_NONE) {
 847                         CWARN("client %s -> target %s uses old version, "
 848                               "can not run under security level %d.\n",
 849                               client, tgt_name(tgt), tgt->lut_sec_level);
 850                         RETURN(-EACCES);
 851                 } else {
 852                         CWARN("client %s -> target %s uses old version, "
 853                               "run under security level %d.\n",
 854                               client, tgt_name(tgt), tgt->lut_sec_level);
 855                         tgt_init_sec_none(reply);
 856                         RETURN(0);
 857                 }
 858         }
 859
 860         remote = data->ocd_connect_flags & OBD_CONNECT_RMT_CLIENT_FORCE;
 861         if (remote) {
 862                 if (!req->rq_auth_remote)
 863                         CDEBUG(D_SEC, "client (local realm) %s -> target %s "
 864                                "asked to be remote.\n", client, tgt_name(tgt));
 865         } else if (req->rq_auth_remote) {
 866                 remote = true;
 867                 CDEBUG(D_SEC, "client (remote realm) %s -> target %s is set "
 868                        "as remote by default.\n", client, tgt_name(tgt));
 869         }
 870
 871         if (remote == 0) {
 872                 if (!uid_valid(make_kuid(&init_user_ns, req->rq_auth_uid))) {
 873                         CDEBUG(D_SEC, "client %s -> target %s: user is not "
 874                                "authenticated!\n", client, tgt_name(tgt));
 875                         RETURN(-EACCES);
 876                 }
 877         }
 878
 879
 880         switch (tgt->lut_sec_level) {
 881         case LUSTRE_SEC_NONE:
 882                 if (remote) {
 883                         CDEBUG(D_SEC,
 884                                "client %s -> target %s is set as remote, "
 885                                "can not run under security level %d.\n",
 886                                client, tgt_name(tgt), tgt->lut_sec_level);
 887                         RETURN(-EACCES);
 888                 }
 889                 tgt_init_sec_none(reply);
 890                 break;
 891         case LUSTRE_SEC_REMOTE:
 892                 if (!remote)
 893                         tgt_init_sec_none(reply);
 894                 break;
 895         case LUSTRE_SEC_ALL:
 896                 if (remote)
 897                         break;
 898                 reply->ocd_connect_flags &= ~(OBD_CONNECT_RMT_CLIENT |
 899                                               OBD_CONNECT_RMT_CLIENT_FORCE);
 900                 reply->ocd_connect_flags &= ~OBD_CONNECT_OSS_CAPA;
 901                 reply->ocd_connect_flags &= ~OBD_CONNECT_MDS_CAPA;
 902                 break;
 903         default:
 904                 RETURN(-EINVAL);
 905         }
 906
 907         RETURN(rc);
 908 }
 909
 910 int tgt_connect_check_sptlrpc(struct ptlrpc_request *req, struct obd_export *exp)
 911 {
 912         struct lu_target        *tgt = class_exp2tgt(exp);
 913         struct sptlrpc_flavor    flvr;
 914         int                      rc = 0;
 915
 916         LASSERT(tgt);
 917         LASSERT(tgt->lut_obd);
 918         LASSERT(tgt->lut_slice);
 919
 920         /* always allow ECHO client */
 921         if (unlikely(strcmp(exp->exp_obd->obd_type->typ_name,
 922                             LUSTRE_ECHO_NAME) == 0)) {
 923                 exp->exp_flvr.sf_rpc = SPTLRPC_FLVR_ANY;
 924                 return 0;
 925         }
 926
 927         if (exp->exp_flvr.sf_rpc == SPTLRPC_FLVR_INVALID) {
 928                 read_lock(&tgt->lut_sptlrpc_lock);
 929                 sptlrpc_target_choose_flavor(&tgt->lut_sptlrpc_rset,
 930                                              req->rq_sp_from,
 931                                              req->rq_peer.nid,
 932                                              &flvr);
 933                 read_unlock(&tgt->lut_sptlrpc_lock);
 934
 935                 spin_lock(&exp->exp_lock);
 936                 exp->exp_sp_peer = req->rq_sp_from;
 937                 exp->exp_flvr = flvr;
 938
 939                 /* when on mgs, if no restriction is set, or if client
 940                  * is loopback, allow any flavor */
 941                 if ((strcmp(exp->exp_obd->obd_type->typ_name,
 942                            LUSTRE_MGS_NAME) == 0) &&
 943                      (exp->exp_flvr.sf_rpc == SPTLRPC_FLVR_NULL ||
 944                       LNET_NETTYP(LNET_NIDNET(exp->exp_connection->c_peer.nid))
 945                       == LOLND))
 946                         exp->exp_flvr.sf_rpc = SPTLRPC_FLVR_ANY;
 947
 948                 if (exp->exp_flvr.sf_rpc != SPTLRPC_FLVR_ANY &&
 949                     exp->exp_flvr.sf_rpc != req->rq_flvr.sf_rpc) {
 950                         CERROR("%s: unauthorized rpc flavor %x from %s, "
 951                                "expect %x\n", tgt_name(tgt),
 952                                req->rq_flvr.sf_rpc,
 953                                libcfs_nid2str(req->rq_peer.nid),
 954                                exp->exp_flvr.sf_rpc);
 955                         rc = -EACCES;
 956                 }
 957                 spin_unlock(&exp->exp_lock);
 958         } else {
 959                 if (exp->exp_sp_peer != req->rq_sp_from) {
 960                         CERROR("%s: RPC source %s doesn't match %s\n",
 961                                tgt_name(tgt),
 962                                sptlrpc_part2name(req->rq_sp_from),
 963                                sptlrpc_part2name(exp->exp_sp_peer));
 964                         rc = -EACCES;
 965                 } else {
 966                         rc = sptlrpc_target_export_check(exp, req);
 967                 }
 968         }
 969
 970         return rc;
 971 }
 972
 973 int tgt_adapt_sptlrpc_conf(struct lu_target *tgt, int initial)
 974 {
 975         struct sptlrpc_rule_set  tmp_rset;
 976         int                      rc;
 977
 978         if (unlikely(tgt == NULL)) {
 979                 CERROR("No target passed");
 980                 return -EINVAL;
 981         }
 982
 983         sptlrpc_rule_set_init(&tmp_rset);
 984         rc = sptlrpc_conf_target_get_rules(tgt->lut_obd, &tmp_rset, initial);
 985         if (rc) {
 986                 CERROR("%s: failed get sptlrpc rules: rc = %d\n",
 987                        tgt_name(tgt), rc);
 988                 return rc;
 989         }
 990
 991         sptlrpc_target_update_exp_flavor(tgt->lut_obd, &tmp_rset);
 992
 993         write_lock(&tgt->lut_sptlrpc_lock);
 994         sptlrpc_rule_set_free(&tgt->lut_sptlrpc_rset);
 995         tgt->lut_sptlrpc_rset = tmp_rset;
 996         write_unlock(&tgt->lut_sptlrpc_lock);
 997
 998         return 0;
 999 }
1000 EXPORT_SYMBOL(tgt_adapt_sptlrpc_conf);
1001
1002 int tgt_connect(struct tgt_session_info *tsi)
1003 {
1004         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1005         struct obd_connect_data *reply;
1006         int                      rc;
1007
1008         ENTRY;
1009
1010         rc = tgt_init_sec_level(req);
1011         if (rc != 0)
1012                 GOTO(out, rc);
1013
1014         /* XXX: better to call this check right after getting new export but
1015          * before last_rcvd slot allocation to avoid server load upon insecure
1016          * connects. This is to be fixed after unifiyng all targets.
1017          */
1018         rc = tgt_connect_check_sptlrpc(req, tsi->tsi_exp);
1019         if (rc)
1020                 GOTO(out, rc);
1021
1022         /* To avoid exposing partially initialized connection flags, changes up
1023          * to this point have been staged in reply->ocd_connect_flags. Now that
1024          * connection handling has completed successfully, atomically update
1025          * the connect flags in the shared export data structure. LU-1623 */
1026         reply = req_capsule_server_get(tsi->tsi_pill, &RMF_CONNECT_DATA);
1027         spin_lock(&tsi->tsi_exp->exp_lock);
1028         *exp_connect_flags_ptr(tsi->tsi_exp) = reply->ocd_connect_flags;
1029         tsi->tsi_exp->exp_connect_data.ocd_brw_size = reply->ocd_brw_size;
1030         spin_unlock(&tsi->tsi_exp->exp_lock);
1031
1032         RETURN(0);
1033 out:
1034         obd_disconnect(class_export_get(tsi->tsi_exp));
1035         return rc;
1036 }
1037 EXPORT_SYMBOL(tgt_connect);
1038
1039 int tgt_disconnect(struct tgt_session_info *tsi)
1040 {
1041         int rc;
1042
1043         ENTRY;
1044
1045         rc = target_handle_disconnect(tgt_ses_req(tsi));
1046         if (rc)
1047                 RETURN(err_serious(rc));
1048
1049         RETURN(rc);
1050 }
1051 EXPORT_SYMBOL(tgt_disconnect);
1052
1053 /*
1054  * Unified target OBD handlers
1055  */
1056 int tgt_obd_ping(struct tgt_session_info *tsi)
1057 {
1058         int rc;
1059
1060         ENTRY;
1061
1062         rc = target_handle_ping(tgt_ses_req(tsi));
1063         if (rc)
1064                 RETURN(err_serious(rc));
1065
1066         RETURN(rc);
1067 }
1068 EXPORT_SYMBOL(tgt_obd_ping);
1069
1070 int tgt_obd_log_cancel(struct tgt_session_info *tsi)
1071 {
1072         return err_serious(-EOPNOTSUPP);
1073 }
1074
1075 int tgt_send_buffer(struct tgt_session_info *tsi, struct lu_rdbuf *rdbuf)
1076 {
1077         struct tgt_thread_info  *tti = tgt_th_info(tsi->tsi_env);
1078         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1079         struct obd_export       *exp = req->rq_export;
1080         struct ptlrpc_bulk_desc *desc;
1081         struct l_wait_info      *lwi = &tti->tti_u.update.tti_wait_info;
1082         int                      i;
1083         int                      rc;
1084
1085         ENTRY;
1086
1087         desc = ptlrpc_prep_bulk_exp(req, rdbuf->rb_nbufs, 1,
1088                                   PTLRPC_BULK_PUT_SOURCE | PTLRPC_BULK_BUF_KVEC,
1089                                     MDS_BULK_PORTAL, &ptlrpc_bulk_kvec_ops);
1090         if (desc == NULL)
1091                 RETURN(-ENOMEM);
1092
1093         for (i = 0; i < rdbuf->rb_nbufs; i++)
1094                 desc->bd_frag_ops->add_iov_frag(desc,
1095                                         rdbuf->rb_bufs[i].lb_buf,
1096                                         rdbuf->rb_bufs[i].lb_len);
1097
1098         rc = target_bulk_io(exp, desc, lwi);
1099         ptlrpc_free_bulk(desc);
1100         RETURN(rc);
1101 }
1102 EXPORT_SYMBOL(tgt_send_buffer);
1103
1104 int tgt_sendpage(struct tgt_session_info *tsi, struct lu_rdpg *rdpg, int nob)
1105 {
1106         struct tgt_thread_info  *tti = tgt_th_info(tsi->tsi_env);
1107         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1108         struct obd_export       *exp = req->rq_export;
1109         struct ptlrpc_bulk_desc *desc;
1110         struct l_wait_info      *lwi = &tti->tti_u.rdpg.tti_wait_info;
1111         int                      tmpcount;
1112         int                      tmpsize;
1113         int                      i;
1114         int                      rc;
1115
1116         ENTRY;
1117
1118         desc = ptlrpc_prep_bulk_exp(req, rdpg->rp_npages, 1,
1119                                     PTLRPC_BULK_PUT_SOURCE |
1120                                         PTLRPC_BULK_BUF_KIOV,
1121                                     MDS_BULK_PORTAL,
1122                                     &ptlrpc_bulk_kiov_pin_ops);
1123         if (desc == NULL)
1124                 RETURN(-ENOMEM);
1125
1126         if (!(exp_connect_flags(exp) & OBD_CONNECT_BRW_SIZE))
1127                 /* old client requires reply size in it's PAGE_CACHE_SIZE,
1128                  * which is rdpg->rp_count */
1129                 nob = rdpg->rp_count;
1130
1131         for (i = 0, tmpcount = nob; i < rdpg->rp_npages && tmpcount > 0;
1132              i++, tmpcount -= tmpsize) {
1133                 tmpsize = min_t(int, tmpcount, PAGE_CACHE_SIZE);
1134                 desc->bd_frag_ops->add_kiov_frag(desc, rdpg->rp_pages[i], 0,
1135                                                  tmpsize);
1136         }
1137
1138         LASSERT(desc->bd_nob == nob);
1139         rc = target_bulk_io(exp, desc, lwi);
1140         ptlrpc_free_bulk(desc);
1141         RETURN(rc);
1142 }
1143 EXPORT_SYMBOL(tgt_sendpage);
1144
1145 /*
1146  * OBD_IDX_READ handler
1147  */
1148 static int tgt_obd_idx_read(struct tgt_session_info *tsi)
1149 {
1150         struct tgt_thread_info  *tti = tgt_th_info(tsi->tsi_env);
1151         struct lu_rdpg          *rdpg = &tti->tti_u.rdpg.tti_rdpg;
1152         struct idx_info         *req_ii, *rep_ii;
1153         int                      rc, i;
1154
1155         ENTRY;
1156
1157         memset(rdpg, 0, sizeof(*rdpg));
1158         req_capsule_set(tsi->tsi_pill, &RQF_OBD_IDX_READ);
1159
1160         /* extract idx_info buffer from request & reply */
1161         req_ii = req_capsule_client_get(tsi->tsi_pill, &RMF_IDX_INFO);
1162         if (req_ii == NULL || req_ii->ii_magic != IDX_INFO_MAGIC)
1163                 RETURN(err_serious(-EPROTO));
1164
1165         rc = req_capsule_server_pack(tsi->tsi_pill);
1166         if (rc)
1167                 RETURN(err_serious(rc));
1168
1169         rep_ii = req_capsule_server_get(tsi->tsi_pill, &RMF_IDX_INFO);
1170         if (rep_ii == NULL)
1171                 RETURN(err_serious(-EFAULT));
1172         rep_ii->ii_magic = IDX_INFO_MAGIC;
1173
1174         /* extract hash to start with */
1175         rdpg->rp_hash = req_ii->ii_hash_start;
1176
1177         /* extract requested attributes */
1178         rdpg->rp_attrs = req_ii->ii_attrs;
1179
1180         /* check that fid packed in request is valid and supported */
1181         if (!fid_is_sane(&req_ii->ii_fid))
1182                 RETURN(-EINVAL);
1183         rep_ii->ii_fid = req_ii->ii_fid;
1184
1185         /* copy flags */
1186         rep_ii->ii_flags = req_ii->ii_flags;
1187
1188         /* compute number of pages to allocate, ii_count is the number of 4KB
1189          * containers */
1190         if (req_ii->ii_count <= 0)
1191                 GOTO(out, rc = -EFAULT);
1192         rdpg->rp_count = min_t(unsigned int, req_ii->ii_count << LU_PAGE_SHIFT,
1193                                exp_max_brw_size(tsi->tsi_exp));
1194         rdpg->rp_npages = (rdpg->rp_count + PAGE_CACHE_SIZE -1) >> PAGE_CACHE_SHIFT;
1195
1196         /* allocate pages to store the containers */
1197         OBD_ALLOC(rdpg->rp_pages, rdpg->rp_npages * sizeof(rdpg->rp_pages[0]));
1198         if (rdpg->rp_pages == NULL)
1199                 GOTO(out, rc = -ENOMEM);
1200         for (i = 0; i < rdpg->rp_npages; i++) {
1201                 rdpg->rp_pages[i] = alloc_page(GFP_IOFS);
1202                 if (rdpg->rp_pages[i] == NULL)
1203                         GOTO(out, rc = -ENOMEM);
1204         }
1205
1206         /* populate pages with key/record pairs */
1207         rc = dt_index_read(tsi->tsi_env, tsi->tsi_tgt->lut_bottom, rep_ii, rdpg);
1208         if (rc < 0)
1209                 GOTO(out, rc);
1210
1211         LASSERTF(rc <= rdpg->rp_count, "dt_index_read() returned more than "
1212                  "asked %d > %d\n", rc, rdpg->rp_count);
1213
1214         /* send pages to client */
1215         rc = tgt_sendpage(tsi, rdpg, rc);
1216         if (rc)
1217                 GOTO(out, rc);
1218         EXIT;
1219 out:
1220         if (rdpg->rp_pages) {
1221                 for (i = 0; i < rdpg->rp_npages; i++)
1222                         if (rdpg->rp_pages[i])
1223                                 __free_page(rdpg->rp_pages[i]);
1224                 OBD_FREE(rdpg->rp_pages,
1225                          rdpg->rp_npages * sizeof(rdpg->rp_pages[0]));
1226         }
1227         return rc;
1228 }
1229
1230 struct tgt_handler tgt_obd_handlers[] = {
1231 TGT_OBD_HDL    (0,      OBD_PING,               tgt_obd_ping),
1232 TGT_OBD_HDL_VAR(0,      OBD_LOG_CANCEL,         tgt_obd_log_cancel),
1233 TGT_OBD_HDL    (0,      OBD_IDX_READ,           tgt_obd_idx_read)
1234 };
1235 EXPORT_SYMBOL(tgt_obd_handlers);
1236
1237 int tgt_sync(const struct lu_env *env, struct lu_target *tgt,
1238              struct dt_object *obj, __u64 start, __u64 end)
1239 {
1240         int rc = 0;
1241
1242         ENTRY;
1243
1244         /* if no objid is specified, it means "sync whole filesystem" */
1245         if (obj == NULL) {
1246                 rc = dt_sync(env, tgt->lut_bottom);
1247         } else if (dt_version_get(env, obj) >
1248                    tgt->lut_obd->obd_last_committed) {
1249                 rc = dt_object_sync(env, obj, start, end);
1250         }
1251
1252         RETURN(rc);
1253 }
1254 EXPORT_SYMBOL(tgt_sync);
1255 /*
1256  * Unified target DLM handlers.
1257  */
1258
1259 /* Ensure that data and metadata are synced to the disk when lock is cancelled
1260  * (if requested) */
1261 static int tgt_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
1262                             void *data, int flag)
1263 {
1264         struct lu_env            env;
1265         struct lu_target        *tgt;
1266         struct dt_object        *obj;
1267         struct lu_fid            fid;
1268         int                      rc = 0;
1269
1270         ENTRY;
1271
1272         tgt = class_exp2tgt(lock->l_export);
1273
1274         if (unlikely(tgt == NULL)) {
1275                 CDEBUG(D_ERROR, "%s: No target for connected export\n",
1276                        class_exp2obd(lock->l_export)->obd_name);
1277                 RETURN(-EINVAL);
1278         }
1279
1280         if (flag == LDLM_CB_CANCELING &&
1281             (lock->l_granted_mode & (LCK_PW | LCK_GROUP)) &&
1282             (tgt->lut_sync_lock_cancel == ALWAYS_SYNC_ON_CANCEL ||
1283              (tgt->lut_sync_lock_cancel == BLOCKING_SYNC_ON_CANCEL &&
1284               lock->l_flags & LDLM_FL_CBPENDING))) {
1285                 __u64 start = 0;
1286                 __u64 end = OBD_OBJECT_EOF;
1287
1288                 rc = lu_env_init(&env, LCT_DT_THREAD);
1289                 if (unlikely(rc != 0))
1290                         RETURN(rc);
1291
1292                 ost_fid_from_resid(&fid, &lock->l_resource->lr_name,
1293                                    tgt->lut_lsd.lsd_osd_index);
1294                 obj = dt_locate(&env, tgt->lut_bottom, &fid);
1295                 if (IS_ERR(obj))
1296                         GOTO(err_env, rc = PTR_ERR(obj));
1297
1298                 if (!dt_object_exists(obj))
1299                         GOTO(err_put, rc = -ENOENT);
1300
1301                 if (lock->l_resource->lr_type == LDLM_EXTENT) {
1302                         start = lock->l_policy_data.l_extent.start;
1303                         end = lock->l_policy_data.l_extent.end;
1304                 }
1305
1306                 rc = tgt_sync(&env, tgt, obj, start, end);
1307                 if (rc < 0) {
1308                         CERROR("%s: syncing "DFID" ("LPU64"-"LPU64") on lock "
1309                                "cancel: rc = %d\n",
1310                                tgt_name(tgt), PFID(&fid),
1311                                lock->l_policy_data.l_extent.start,
1312                                lock->l_policy_data.l_extent.end, rc);
1313                 }
1314 err_put:
1315                 lu_object_put(&env, &obj->do_lu);
1316 err_env:
1317                 lu_env_fini(&env);
1318         }
1319
1320         rc = ldlm_server_blocking_ast(lock, desc, data, flag);
1321         RETURN(rc);
1322 }
1323
1324 static struct ldlm_callback_suite tgt_dlm_cbs = {
1325         .lcs_completion = ldlm_server_completion_ast,
1326         .lcs_blocking   = tgt_blocking_ast,
1327         .lcs_glimpse    = ldlm_server_glimpse_ast
1328 };
1329
1330 int tgt_enqueue(struct tgt_session_info *tsi)
1331 {
1332         struct ptlrpc_request *req = tgt_ses_req(tsi);
1333         int rc;
1334
1335         ENTRY;
1336         /*
1337          * tsi->tsi_dlm_req was already swapped and (if necessary) converted,
1338          * tsi->tsi_dlm_cbs was set by the *_req_handle() function.
1339          */
1340         LASSERT(tsi->tsi_dlm_req != NULL);
1341         rc = ldlm_handle_enqueue0(tsi->tsi_exp->exp_obd->obd_namespace, req,
1342                                   tsi->tsi_dlm_req, &tgt_dlm_cbs);
1343         if (rc)
1344                 RETURN(err_serious(rc));
1345
1346         switch (LUT_FAIL_CLASS(tsi->tsi_reply_fail_id)) {
1347         case LUT_FAIL_MDT:
1348                 tsi->tsi_reply_fail_id = OBD_FAIL_MDS_LDLM_REPLY_NET;
1349                 break;
1350         case LUT_FAIL_OST:
1351                 tsi->tsi_reply_fail_id = OBD_FAIL_OST_LDLM_REPLY_NET;
1352                 break;
1353         case LUT_FAIL_MGT:
1354                 tsi->tsi_reply_fail_id = OBD_FAIL_MGS_LDLM_REPLY_NET;
1355                 break;
1356         default:
1357                 tsi->tsi_reply_fail_id = OBD_FAIL_LDLM_REPLY;
1358                 break;
1359         }
1360         RETURN(req->rq_status);
1361 }
1362 EXPORT_SYMBOL(tgt_enqueue);
1363
1364 int tgt_convert(struct tgt_session_info *tsi)
1365 {
1366         struct ptlrpc_request *req = tgt_ses_req(tsi);
1367         int rc;
1368
1369         ENTRY;
1370         LASSERT(tsi->tsi_dlm_req);
1371         rc = ldlm_handle_convert0(req, tsi->tsi_dlm_req);
1372         if (rc)
1373                 RETURN(err_serious(rc));
1374
1375         RETURN(req->rq_status);
1376 }
1377
1378 int tgt_bl_callback(struct tgt_session_info *tsi)
1379 {
1380         return err_serious(-EOPNOTSUPP);
1381 }
1382
1383 int tgt_cp_callback(struct tgt_session_info *tsi)
1384 {
1385         return err_serious(-EOPNOTSUPP);
1386 }
1387
1388 /* generic LDLM target handler */
1389 struct tgt_handler tgt_dlm_handlers[] = {
1390 TGT_DLM_HDL    (HABEO_CLAVIS,   LDLM_ENQUEUE,           tgt_enqueue),
1391 TGT_DLM_HDL_VAR(HABEO_CLAVIS,   LDLM_CONVERT,           tgt_convert),
1392 TGT_DLM_HDL_VAR(0,              LDLM_BL_CALLBACK,       tgt_bl_callback),
1393 TGT_DLM_HDL_VAR(0,              LDLM_CP_CALLBACK,       tgt_cp_callback)
1394 };
1395 EXPORT_SYMBOL(tgt_dlm_handlers);
1396
1397 /*
1398  * Unified target LLOG handlers.
1399  */
1400 int tgt_llog_open(struct tgt_session_info *tsi)
1401 {
1402         int rc;
1403
1404         ENTRY;
1405
1406         rc = llog_origin_handle_open(tgt_ses_req(tsi));
1407
1408         RETURN(rc);
1409 }
1410 EXPORT_SYMBOL(tgt_llog_open);
1411
1412 int tgt_llog_close(struct tgt_session_info *tsi)
1413 {
1414         int rc;
1415
1416         ENTRY;
1417
1418         rc = llog_origin_handle_close(tgt_ses_req(tsi));
1419
1420         RETURN(rc);
1421 }
1422 EXPORT_SYMBOL(tgt_llog_close);
1423
1424
1425 int tgt_llog_destroy(struct tgt_session_info *tsi)
1426 {
1427         int rc;
1428
1429         ENTRY;
1430
1431         rc = llog_origin_handle_destroy(tgt_ses_req(tsi));
1432
1433         RETURN(rc);
1434 }
1435
1436 int tgt_llog_read_header(struct tgt_session_info *tsi)
1437 {
1438         int rc;
1439
1440         ENTRY;
1441
1442         rc = llog_origin_handle_read_header(tgt_ses_req(tsi));
1443
1444         RETURN(rc);
1445 }
1446 EXPORT_SYMBOL(tgt_llog_read_header);
1447
1448 int tgt_llog_next_block(struct tgt_session_info *tsi)
1449 {
1450         int rc;
1451
1452         ENTRY;
1453
1454         rc = llog_origin_handle_next_block(tgt_ses_req(tsi));
1455
1456         RETURN(rc);
1457 }
1458 EXPORT_SYMBOL(tgt_llog_next_block);
1459
1460 int tgt_llog_prev_block(struct tgt_session_info *tsi)
1461 {
1462         int rc;
1463
1464         ENTRY;
1465
1466         rc = llog_origin_handle_prev_block(tgt_ses_req(tsi));
1467
1468         RETURN(rc);
1469 }
1470 EXPORT_SYMBOL(tgt_llog_prev_block);
1471
1472 /* generic llog target handler */
1473 struct tgt_handler tgt_llog_handlers[] = {
1474 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_CREATE,      tgt_llog_open),
1475 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_NEXT_BLOCK,  tgt_llog_next_block),
1476 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_READ_HEADER, tgt_llog_read_header),
1477 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_PREV_BLOCK,  tgt_llog_prev_block),
1478 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_DESTROY,     tgt_llog_destroy),
1479 TGT_LLOG_HDL_VAR(0,     LLOG_ORIGIN_HANDLE_CLOSE,       tgt_llog_close),
1480 };
1481 EXPORT_SYMBOL(tgt_llog_handlers);
1482
1483 /*
1484  * sec context handlers
1485  */
1486 /* XXX: Implement based on mdt_sec_ctx_handle()? */
1487 static int tgt_sec_ctx_handle(struct tgt_session_info *tsi)
1488 {
1489         return 0;
1490 }
1491
1492 struct tgt_handler tgt_sec_ctx_handlers[] = {
1493 TGT_SEC_HDL_VAR(0,      SEC_CTX_INIT,           tgt_sec_ctx_handle),
1494 TGT_SEC_HDL_VAR(0,      SEC_CTX_INIT_CONT,      tgt_sec_ctx_handle),
1495 TGT_SEC_HDL_VAR(0,      SEC_CTX_FINI,           tgt_sec_ctx_handle),
1496 };
1497 EXPORT_SYMBOL(tgt_sec_ctx_handlers);
1498
1499 int (*tgt_lfsck_in_notify)(const struct lu_env *env,
1500                            struct dt_device *key,
1501                            struct lfsck_request *lr,
1502                            struct thandle *th) = NULL;
1503
1504 void tgt_register_lfsck_in_notify(int (*notify)(const struct lu_env *,
1505                                                 struct dt_device *,
1506                                                 struct lfsck_request *,
1507                                                 struct thandle *))
1508 {
1509         tgt_lfsck_in_notify = notify;
1510 }
1511 EXPORT_SYMBOL(tgt_register_lfsck_in_notify);
1512
1513 static int (*tgt_lfsck_query)(const struct lu_env *env,
1514                               struct dt_device *key,
1515                               struct lfsck_request *lr) = NULL;
1516
1517 void tgt_register_lfsck_query(int (*query)(const struct lu_env *,
1518                                            struct dt_device *,
1519                                            struct lfsck_request *))
1520 {
1521         tgt_lfsck_query = query;
1522 }
1523 EXPORT_SYMBOL(tgt_register_lfsck_query);
1524
1525 /* LFSCK request handlers */
1526 static int tgt_handle_lfsck_notify(struct tgt_session_info *tsi)
1527 {
1528         const struct lu_env     *env = tsi->tsi_env;
1529         struct dt_device        *key = tsi->tsi_tgt->lut_bottom;
1530         struct lfsck_request    *lr;
1531         int                      rc;
1532         ENTRY;
1533
1534         lr = req_capsule_client_get(tsi->tsi_pill, &RMF_LFSCK_REQUEST);
1535         if (lr == NULL)
1536                 RETURN(-EPROTO);
1537
1538         rc = tgt_lfsck_in_notify(env, key, lr, NULL);
1539
1540         RETURN(rc);
1541 }
1542
1543 static int tgt_handle_lfsck_query(struct tgt_session_info *tsi)
1544 {
1545         struct lfsck_request    *request;
1546         struct lfsck_reply      *reply;
1547         int                      rc;
1548         ENTRY;
1549
1550         request = req_capsule_client_get(tsi->tsi_pill, &RMF_LFSCK_REQUEST);
1551         if (request == NULL)
1552                 RETURN(-EPROTO);
1553
1554         reply = req_capsule_server_get(tsi->tsi_pill, &RMF_LFSCK_REPLY);
1555         if (reply == NULL)
1556                 RETURN(-ENOMEM);
1557
1558         rc = tgt_lfsck_query(tsi->tsi_env, tsi->tsi_tgt->lut_bottom, request);
1559         reply->lr_status = rc;
1560
1561         RETURN(rc < 0 ? rc : 0);
1562 }
1563
1564 struct tgt_handler tgt_lfsck_handlers[] = {
1565 TGT_LFSCK_HDL(HABEO_REFERO,     LFSCK_NOTIFY,   tgt_handle_lfsck_notify),
1566 TGT_LFSCK_HDL(HABEO_REFERO,     LFSCK_QUERY,    tgt_handle_lfsck_query),
1567 };
1568 EXPORT_SYMBOL(tgt_lfsck_handlers);
1569
1570 /*
1571  * initialize per-thread page pool (bug 5137).
1572  */
1573 int tgt_io_thread_init(struct ptlrpc_thread *thread)
1574 {
1575         struct tgt_thread_big_cache *tbc;
1576
1577         ENTRY;
1578
1579         LASSERT(thread != NULL);
1580         LASSERT(thread->t_data == NULL);
1581
1582         OBD_ALLOC_LARGE(tbc, sizeof(*tbc));
1583         if (tbc == NULL)
1584                 RETURN(-ENOMEM);
1585         thread->t_data = tbc;
1586         RETURN(0);
1587 }
1588 EXPORT_SYMBOL(tgt_io_thread_init);
1589
1590 /*
1591  * free per-thread pool created by tgt_thread_init().
1592  */
1593 void tgt_io_thread_done(struct ptlrpc_thread *thread)
1594 {
1595         struct tgt_thread_big_cache *tbc;
1596
1597         ENTRY;
1598
1599         LASSERT(thread != NULL);
1600
1601         /*
1602          * be prepared to handle partially-initialized pools (because this is
1603          * called from ost_io_thread_init() for cleanup.
1604          */
1605         tbc = thread->t_data;
1606         if (tbc != NULL) {
1607                 OBD_FREE_LARGE(tbc, sizeof(*tbc));
1608                 thread->t_data = NULL;
1609         }
1610         EXIT;
1611 }
1612 EXPORT_SYMBOL(tgt_io_thread_done);
1613 /**
1614  * Helper function for getting server side [start, start+count] DLM lock
1615  * if asked by client.
1616  */
1617 int tgt_extent_lock(struct ldlm_namespace *ns, struct ldlm_res_id *res_id,
1618                     __u64 start, __u64 end, struct lustre_handle *lh,
1619                     int mode, __u64 *flags)
1620 {
1621         union ldlm_policy_data policy;
1622         int rc;
1623
1624         ENTRY;
1625
1626         LASSERT(lh != NULL);
1627         LASSERT(ns != NULL);
1628         LASSERT(!lustre_handle_is_used(lh));
1629
1630         policy.l_extent.gid = 0;
1631         policy.l_extent.start = start & PAGE_MASK;
1632
1633         /*
1634          * If ->o_blocks is EOF it means "lock till the end of the file".
1635          * Otherwise, it's size of an extent or hole being punched (in bytes).
1636          */
1637         if (end == OBD_OBJECT_EOF || end < start)
1638                 policy.l_extent.end = OBD_OBJECT_EOF;
1639         else
1640                 policy.l_extent.end = end | ~PAGE_MASK;
1641
1642         rc = ldlm_cli_enqueue_local(ns, res_id, LDLM_EXTENT, &policy, mode,
1643                                     flags, ldlm_blocking_ast,
1644                                     ldlm_completion_ast, ldlm_glimpse_ast,
1645                                     NULL, 0, LVB_T_NONE, NULL, lh);
1646         RETURN(rc == ELDLM_OK ? 0 : -EIO);
1647 }
1648 EXPORT_SYMBOL(tgt_extent_lock);
1649
1650 void tgt_extent_unlock(struct lustre_handle *lh, enum ldlm_mode mode)
1651 {
1652         LASSERT(lustre_handle_is_used(lh));
1653         ldlm_lock_decref(lh, mode);
1654 }
1655 EXPORT_SYMBOL(tgt_extent_unlock);
1656
1657 int tgt_brw_lock(struct ldlm_namespace *ns, struct ldlm_res_id *res_id,
1658                  struct obd_ioobj *obj, struct niobuf_remote *nb,
1659                  struct lustre_handle *lh, enum ldlm_mode mode)
1660 {
1661         __u64                    flags = 0;
1662         int                      nrbufs = obj->ioo_bufcnt;
1663         int                      i;
1664
1665         ENTRY;
1666
1667         LASSERT(mode == LCK_PR || mode == LCK_PW);
1668         LASSERT(!lustre_handle_is_used(lh));
1669
1670         if (nrbufs == 0 || !(nb[0].rnb_flags & OBD_BRW_SRVLOCK))
1671                 RETURN(0);
1672
1673         for (i = 1; i < nrbufs; i++)
1674                 if (!(nb[i].rnb_flags & OBD_BRW_SRVLOCK))
1675                         RETURN(-EFAULT);
1676
1677         RETURN(tgt_extent_lock(ns, res_id, nb[0].rnb_offset,
1678                                nb[nrbufs - 1].rnb_offset +
1679                                nb[nrbufs - 1].rnb_len - 1,
1680                                lh, mode, &flags));
1681 }
1682
1683 void tgt_brw_unlock(struct obd_ioobj *obj, struct niobuf_remote *niob,
1684                     struct lustre_handle *lh, enum ldlm_mode mode)
1685 {
1686         ENTRY;
1687
1688         LASSERT(mode == LCK_PR || mode == LCK_PW);
1689         LASSERT((obj->ioo_bufcnt > 0 &&
1690                  (niob[0].rnb_flags & OBD_BRW_SRVLOCK)) ==
1691                 lustre_handle_is_used(lh));
1692
1693         if (lustre_handle_is_used(lh))
1694                 tgt_extent_unlock(lh, mode);
1695         EXIT;
1696 }
1697
1698 static __u32 tgt_checksum_bulk(struct lu_target *tgt,
1699                                struct ptlrpc_bulk_desc *desc, int opc,
1700                                cksum_type_t cksum_type)
1701 {
1702         struct cfs_crypto_hash_desc     *hdesc;
1703         unsigned int                    bufsize;
1704         int                             i, err;
1705         unsigned char                   cfs_alg = cksum_obd2cfs(cksum_type);
1706         __u32                           cksum;
1707
1708         LASSERT(ptlrpc_is_bulk_desc_kiov(desc->bd_type));
1709
1710         hdesc = cfs_crypto_hash_init(cfs_alg, NULL, 0);
1711         if (IS_ERR(hdesc)) {
1712                 CERROR("%s: unable to initialize checksum hash %s\n",
1713                        tgt_name(tgt), cfs_crypto_hash_name(cfs_alg));
1714                 return PTR_ERR(hdesc);
1715         }
1716
1717         CDEBUG(D_INFO, "Checksum for algo %s\n", cfs_crypto_hash_name(cfs_alg));
1718         for (i = 0; i < desc->bd_iov_count; i++) {
1719                 /* corrupt the data before we compute the checksum, to
1720                  * simulate a client->OST data error */
1721                 if (i == 0 && opc == OST_WRITE &&
1722                     OBD_FAIL_CHECK(OBD_FAIL_OST_CHECKSUM_RECEIVE)) {
1723                         int off = BD_GET_KIOV(desc, i).kiov_offset &
1724                                 ~PAGE_MASK;
1725                         int len = BD_GET_KIOV(desc, i).kiov_len;
1726                         struct page *np = tgt_page_to_corrupt;
1727                         char *ptr = kmap(BD_GET_KIOV(desc, i).kiov_page) + off;
1728
1729                         if (np) {
1730                                 char *ptr2 = kmap(np) + off;
1731
1732                                 memcpy(ptr2, ptr, len);
1733                                 memcpy(ptr2, "bad3", min(4, len));
1734                                 kunmap(np);
1735                                 BD_GET_KIOV(desc, i).kiov_page = np;
1736                         } else {
1737                                 CERROR("%s: can't alloc page for corruption\n",
1738                                        tgt_name(tgt));
1739                         }
1740                 }
1741                 cfs_crypto_hash_update_page(hdesc,
1742                                   BD_GET_KIOV(desc, i).kiov_page,
1743                                   BD_GET_KIOV(desc, i).kiov_offset &
1744                                         ~PAGE_MASK,
1745                                   BD_GET_KIOV(desc, i).kiov_len);
1746
1747                  /* corrupt the data after we compute the checksum, to
1748                  * simulate an OST->client data error */
1749                 if (i == 0 && opc == OST_READ &&
1750                     OBD_FAIL_CHECK(OBD_FAIL_OST_CHECKSUM_SEND)) {
1751                         int off = BD_GET_KIOV(desc, i).kiov_offset
1752                           & ~PAGE_MASK;
1753                         int len = BD_GET_KIOV(desc, i).kiov_len;
1754                         struct page *np = tgt_page_to_corrupt;
1755                         char *ptr =
1756                           kmap(BD_GET_KIOV(desc, i).kiov_page) + off;
1757
1758                         if (np) {
1759                                 char *ptr2 = kmap(np) + off;
1760
1761                                 memcpy(ptr2, ptr, len);
1762                                 memcpy(ptr2, "bad4", min(4, len));
1763                                 kunmap(np);
1764                                 BD_GET_KIOV(desc, i).kiov_page = np;
1765                         } else {
1766                                 CERROR("%s: can't alloc page for corruption\n",
1767                                        tgt_name(tgt));
1768                         }
1769                 }
1770         }
1771
1772         bufsize = sizeof(cksum);
1773         err = cfs_crypto_hash_final(hdesc, (unsigned char *)&cksum, &bufsize);
1774
1775         return cksum;
1776 }
1777
1778 int tgt_brw_read(struct tgt_session_info *tsi)
1779 {
1780         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1781         struct ptlrpc_bulk_desc *desc = NULL;
1782         struct obd_export       *exp = tsi->tsi_exp;
1783         struct niobuf_remote    *remote_nb;
1784         struct niobuf_local     *local_nb;
1785         struct obd_ioobj        *ioo;
1786         struct ost_body         *body, *repbody;
1787         struct l_wait_info       lwi;
1788         struct lustre_handle     lockh = { 0 };
1789         int                      npages, nob = 0, rc, i, no_reply = 0;
1790         struct tgt_thread_big_cache *tbc = req->rq_svc_thread->t_data;
1791
1792         ENTRY;
1793
1794         if (ptlrpc_req2svc(req)->srv_req_portal != OST_IO_PORTAL) {
1795                 CERROR("%s: deny read request from %s to portal %u\n",
1796                        tgt_name(tsi->tsi_tgt),
1797                        obd_export_nid2str(req->rq_export),
1798                        ptlrpc_req2svc(req)->srv_req_portal);
1799                 RETURN(-EPROTO);
1800         }
1801
1802         req->rq_bulk_read = 1;
1803
1804         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_READ_BULK))
1805                 RETURN(-EIO);
1806
1807         OBD_FAIL_TIMEOUT(OBD_FAIL_OST_BRW_PAUSE_BULK, cfs_fail_val > 0 ?
1808                          cfs_fail_val : (obd_timeout + 1) / 4);
1809
1810         /* Check if there is eviction in progress, and if so, wait for it to
1811          * finish */
1812         if (unlikely(atomic_read(&exp->exp_obd->obd_evict_inprogress))) {
1813                 /* We do not care how long it takes */
1814                 lwi = LWI_INTR(NULL, NULL);
1815                 rc = l_wait_event(exp->exp_obd->obd_evict_inprogress_waitq,
1816                          !atomic_read(&exp->exp_obd->obd_evict_inprogress),
1817                          &lwi);
1818         }
1819
1820         /* There must be big cache in current thread to process this request
1821          * if it is NULL then something went wrong and it wasn't allocated,
1822          * report -ENOMEM in that case */
1823         if (tbc == NULL)
1824                 RETURN(-ENOMEM);
1825
1826         body = tsi->tsi_ost_body;
1827         LASSERT(body != NULL);
1828
1829         ioo = req_capsule_client_get(tsi->tsi_pill, &RMF_OBD_IOOBJ);
1830         LASSERT(ioo != NULL); /* must exists after tgt_ost_body_unpack */
1831
1832         remote_nb = req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE);
1833         LASSERT(remote_nb != NULL); /* must exists after tgt_ost_body_unpack */
1834
1835         local_nb = tbc->local;
1836
1837         rc = tgt_brw_lock(exp->exp_obd->obd_namespace, &tsi->tsi_resid, ioo,
1838                           remote_nb, &lockh, LCK_PR);
1839         if (rc != 0)
1840                 RETURN(rc);
1841
1842         /*
1843          * If getting the lock took more time than
1844          * client was willing to wait, drop it. b=11330
1845          */
1846         if (cfs_time_current_sec() > req->rq_deadline ||
1847             OBD_FAIL_CHECK(OBD_FAIL_OST_DROP_REQ)) {
1848                 no_reply = 1;
1849                 CERROR("Dropping timed-out read from %s because locking"
1850                        "object "DOSTID" took %ld seconds (limit was %ld).\n",
1851                        libcfs_id2str(req->rq_peer), POSTID(&ioo->ioo_oid),
1852                        cfs_time_current_sec() - req->rq_arrival_time.tv_sec,
1853                        req->rq_deadline - req->rq_arrival_time.tv_sec);
1854                 GOTO(out_lock, rc = -ETIMEDOUT);
1855         }
1856
1857         repbody = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
1858         repbody->oa = body->oa;
1859
1860         npages = PTLRPC_MAX_BRW_PAGES;
1861         rc = obd_preprw(tsi->tsi_env, OBD_BRW_READ, exp, &repbody->oa, 1,
1862                         ioo, remote_nb, &npages, local_nb);
1863         if (rc != 0)
1864                 GOTO(out_lock, rc);
1865
1866         desc = ptlrpc_prep_bulk_exp(req, npages, ioobj_max_brw_get(ioo),
1867                                     PTLRPC_BULK_PUT_SOURCE |
1868                                         PTLRPC_BULK_BUF_KIOV,
1869                                     OST_BULK_PORTAL,
1870                                     &ptlrpc_bulk_kiov_nopin_ops);
1871         if (desc == NULL)
1872                 GOTO(out_commitrw, rc = -ENOMEM);
1873
1874         nob = 0;
1875         for (i = 0; i < npages; i++) {
1876                 int page_rc = local_nb[i].lnb_rc;
1877
1878                 if (page_rc < 0) {
1879                         rc = page_rc;
1880                         break;
1881                 }
1882
1883                 nob += page_rc;
1884                 if (page_rc != 0) { /* some data! */
1885                         LASSERT(local_nb[i].lnb_page != NULL);
1886                         desc->bd_frag_ops->add_kiov_frag
1887                           (desc, local_nb[i].lnb_page,
1888                            local_nb[i].lnb_page_offset,
1889                            page_rc);
1890                 }
1891
1892                 if (page_rc != local_nb[i].lnb_len) { /* short read */
1893                         /* All subsequent pages should be 0 */
1894                         while (++i < npages)
1895                                 LASSERT(local_nb[i].lnb_rc == 0);
1896                         break;
1897                 }
1898         }
1899         if (OBD_FAIL_CHECK(OBD_FAIL_OST_READ_SIZE) &&
1900             nob != cfs_fail_val)
1901                 rc = -E2BIG;
1902
1903         if (body->oa.o_valid & OBD_MD_FLCKSUM) {
1904                 cksum_type_t cksum_type =
1905                         cksum_type_unpack(body->oa.o_valid & OBD_MD_FLFLAGS ?
1906                                           body->oa.o_flags : 0);
1907                 repbody->oa.o_flags = cksum_type_pack(cksum_type);
1908                 repbody->oa.o_valid = OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1909                 repbody->oa.o_cksum = tgt_checksum_bulk(tsi->tsi_tgt, desc,
1910                                                         OST_READ, cksum_type);
1911                 CDEBUG(D_PAGE, "checksum at read origin: %x\n",
1912                        repbody->oa.o_cksum);
1913         } else {
1914                 repbody->oa.o_valid = 0;
1915         }
1916         /* We're finishing using body->oa as an input variable */
1917
1918         /* Check if client was evicted while we were doing i/o before touching
1919          * network */
1920         if (likely(rc == 0 &&
1921                    !CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2))) {
1922                 rc = target_bulk_io(exp, desc, &lwi);
1923                 no_reply = rc != 0;
1924         }
1925
1926 out_commitrw:
1927         /* Must commit after prep above in all cases */
1928         rc = obd_commitrw(tsi->tsi_env, OBD_BRW_READ, exp, &repbody->oa, 1, ioo,
1929                           remote_nb, npages, local_nb, rc);
1930         if (rc == 0)
1931                 tgt_drop_id(exp, &repbody->oa);
1932 out_lock:
1933         tgt_brw_unlock(ioo, remote_nb, &lockh, LCK_PR);
1934
1935         if (desc && !CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2))
1936                 ptlrpc_free_bulk(desc);
1937
1938         LASSERT(rc <= 0);
1939         if (rc == 0) {
1940                 rc = nob;
1941                 ptlrpc_lprocfs_brw(req, nob);
1942         } else if (no_reply) {
1943                 req->rq_no_reply = 1;
1944                 /* reply out callback would free */
1945                 ptlrpc_req_drop_rs(req);
1946                 LCONSOLE_WARN("%s: Bulk IO read error with %s (at %s), "
1947                               "client will retry: rc %d\n",
1948                               exp->exp_obd->obd_name,
1949                               obd_uuid2str(&exp->exp_client_uuid),
1950                               obd_export_nid2str(exp), rc);
1951         }
1952         /* send a bulk after reply to simulate a network delay or reordering
1953          * by a router */
1954         if (unlikely(CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2))) {
1955                 wait_queue_head_t        waitq;
1956                 struct l_wait_info       lwi1;
1957
1958                 CDEBUG(D_INFO, "reorder BULK\n");
1959                 init_waitqueue_head(&waitq);
1960
1961                 lwi1 = LWI_TIMEOUT_INTR(cfs_time_seconds(3), NULL, NULL, NULL);
1962                 l_wait_event(waitq, 0, &lwi1);
1963                 target_bulk_io(exp, desc, &lwi);
1964                 ptlrpc_free_bulk(desc);
1965         }
1966
1967         RETURN(rc);
1968 }
1969 EXPORT_SYMBOL(tgt_brw_read);
1970
1971 static void tgt_warn_on_cksum(struct ptlrpc_request *req,
1972                               struct ptlrpc_bulk_desc *desc,
1973                               struct niobuf_local *local_nb, int npages,
1974                               u32 client_cksum, u32 server_cksum,
1975                               bool mmap)
1976 {
1977         struct obd_export *exp = req->rq_export;
1978         struct ost_body *body;
1979         char *router = "";
1980         char *via = "";
1981
1982         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
1983         LASSERT(body != NULL);
1984
1985         if (req->rq_peer.nid != desc->bd_sender) {
1986                 via = " via ";
1987                 router = libcfs_nid2str(desc->bd_sender);
1988         }
1989
1990         if (mmap) {
1991                 CDEBUG_LIMIT(D_INFO, "client csum %x, server csum %x\n",
1992                              client_cksum, server_cksum);
1993                 return;
1994         }
1995
1996         LCONSOLE_ERROR_MSG(0x168, "BAD WRITE CHECKSUM: %s from %s%s%s inode "
1997                            DFID" object "DOSTID" extent ["LPU64"-"LPU64
1998                            "]: client csum %x, server csum %x\n",
1999                            exp->exp_obd->obd_name, libcfs_id2str(req->rq_peer),
2000                            via, router,
2001                            body->oa.o_valid & OBD_MD_FLFID ?
2002                            body->oa.o_parent_seq : (__u64)0,
2003                            body->oa.o_valid & OBD_MD_FLFID ?
2004                            body->oa.o_parent_oid : 0,
2005                            body->oa.o_valid & OBD_MD_FLFID ?
2006                            body->oa.o_parent_ver : 0,
2007                            POSTID(&body->oa.o_oi),
2008                            local_nb[0].lnb_file_offset,
2009                            local_nb[npages-1].lnb_file_offset +
2010                            local_nb[npages - 1].lnb_len - 1,
2011                            client_cksum, server_cksum);
2012 }
2013
2014 int tgt_brw_write(struct tgt_session_info *tsi)
2015 {
2016         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2017         struct ptlrpc_bulk_desc *desc = NULL;
2018         struct obd_export       *exp = req->rq_export;
2019         struct niobuf_remote    *remote_nb;
2020         struct niobuf_local     *local_nb;
2021         struct obd_ioobj        *ioo;
2022         struct ost_body         *body, *repbody;
2023         struct l_wait_info       lwi;
2024         struct lustre_handle     lockh = {0};
2025         __u32                   *rcs;
2026         int                      objcount, niocount, npages;
2027         int                      rc, i, j;
2028         cksum_type_t             cksum_type = OBD_CKSUM_CRC32;
2029         bool                     no_reply = false, mmap;
2030         struct tgt_thread_big_cache *tbc = req->rq_svc_thread->t_data;
2031
2032         ENTRY;
2033
2034         if (ptlrpc_req2svc(req)->srv_req_portal != OST_IO_PORTAL) {
2035                 CERROR("%s: deny write request from %s to portal %u\n",
2036                        tgt_name(tsi->tsi_tgt),
2037                        obd_export_nid2str(req->rq_export),
2038                        ptlrpc_req2svc(req)->srv_req_portal);
2039                 RETURN(err_serious(-EPROTO));
2040         }
2041
2042         if (OBD_FAIL_CHECK(OBD_FAIL_OST_ENOSPC))
2043                 RETURN(err_serious(-ENOSPC));
2044         if (OBD_FAIL_TIMEOUT(OBD_FAIL_OST_EROFS, 1))
2045                 RETURN(err_serious(-EROFS));
2046
2047         req->rq_bulk_write = 1;
2048
2049         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_WRITE_BULK))
2050                 RETURN(err_serious(-EIO));
2051         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_WRITE_BULK2))
2052                 RETURN(err_serious(-EFAULT));
2053
2054         /* pause before transaction has been started */
2055         CFS_FAIL_TIMEOUT(OBD_FAIL_OST_BRW_PAUSE_BULK, cfs_fail_val > 0 ?
2056                          cfs_fail_val : (obd_timeout + 1) / 4);
2057
2058         /* There must be big cache in current thread to process this request
2059          * if it is NULL then something went wrong and it wasn't allocated,
2060          * report -ENOMEM in that case */
2061         if (tbc == NULL)
2062                 RETURN(-ENOMEM);
2063
2064         body = tsi->tsi_ost_body;
2065         LASSERT(body != NULL);
2066
2067         ioo = req_capsule_client_get(&req->rq_pill, &RMF_OBD_IOOBJ);
2068         LASSERT(ioo != NULL); /* must exists after tgt_ost_body_unpack */
2069
2070         objcount = req_capsule_get_size(&req->rq_pill, &RMF_OBD_IOOBJ,
2071                                         RCL_CLIENT) / sizeof(*ioo);
2072
2073         for (niocount = i = 0; i < objcount; i++)
2074                 niocount += ioo[i].ioo_bufcnt;
2075
2076         remote_nb = req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE);
2077         LASSERT(remote_nb != NULL); /* must exists after tgt_ost_body_unpack */
2078         if (niocount != req_capsule_get_size(&req->rq_pill,
2079                                              &RMF_NIOBUF_REMOTE, RCL_CLIENT) /
2080                         sizeof(*remote_nb))
2081                 RETURN(err_serious(-EPROTO));
2082
2083         if ((remote_nb[0].rnb_flags & OBD_BRW_MEMALLOC) &&
2084             (exp->exp_connection->c_peer.nid == exp->exp_connection->c_self))
2085                 memory_pressure_set();
2086
2087         req_capsule_set_size(&req->rq_pill, &RMF_RCS, RCL_SERVER,
2088                              niocount * sizeof(*rcs));
2089         rc = req_capsule_server_pack(&req->rq_pill);
2090         if (rc != 0)
2091                 GOTO(out, rc = err_serious(rc));
2092
2093         CFS_FAIL_TIMEOUT(OBD_FAIL_OST_BRW_PAUSE_PACK, cfs_fail_val);
2094         rcs = req_capsule_server_get(&req->rq_pill, &RMF_RCS);
2095
2096         local_nb = tbc->local;
2097
2098         rc = tgt_brw_lock(exp->exp_obd->obd_namespace, &tsi->tsi_resid, ioo,
2099                           remote_nb, &lockh, LCK_PW);
2100         if (rc != 0)
2101                 GOTO(out, rc);
2102
2103         /*
2104          * If getting the lock took more time than
2105          * client was willing to wait, drop it. b=11330
2106          */
2107         if (cfs_time_current_sec() > req->rq_deadline ||
2108             OBD_FAIL_CHECK(OBD_FAIL_OST_DROP_REQ)) {
2109                 no_reply = true;
2110                 CERROR("%s: Dropping timed-out write from %s because locking "
2111                        "object "DOSTID" took %ld seconds (limit was %ld).\n",
2112                        tgt_name(tsi->tsi_tgt), libcfs_id2str(req->rq_peer),
2113                        POSTID(&ioo->ioo_oid),
2114                        cfs_time_current_sec() - req->rq_arrival_time.tv_sec,
2115                        req->rq_deadline - req->rq_arrival_time.tv_sec);
2116                 GOTO(out_lock, rc = -ETIMEDOUT);
2117         }
2118
2119         /* Because we already sync grant info with client when reconnect,
2120          * grant info will be cleared for resent req, then fed_grant and
2121          * total_grant will not be modified in following preprw_write */
2122         if (lustre_msg_get_flags(req->rq_reqmsg) & (MSG_RESENT | MSG_REPLAY)) {
2123                 DEBUG_REQ(D_CACHE, req, "clear resent/replay req grant info");
2124                 body->oa.o_valid &= ~OBD_MD_FLGRANT;
2125         }
2126
2127         repbody = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
2128         if (repbody == NULL)
2129                 GOTO(out_lock, rc = -ENOMEM);
2130         repbody->oa = body->oa;
2131
2132         npages = PTLRPC_MAX_BRW_PAGES;
2133         rc = obd_preprw(tsi->tsi_env, OBD_BRW_WRITE, exp, &repbody->oa,
2134                         objcount, ioo, remote_nb, &npages, local_nb);
2135         if (rc < 0)
2136                 GOTO(out_lock, rc);
2137
2138         desc = ptlrpc_prep_bulk_exp(req, npages, ioobj_max_brw_get(ioo),
2139                                     PTLRPC_BULK_GET_SINK | PTLRPC_BULK_BUF_KIOV,
2140                                     OST_BULK_PORTAL,
2141                                     &ptlrpc_bulk_kiov_nopin_ops);
2142         if (desc == NULL)
2143                 GOTO(skip_transfer, rc = -ENOMEM);
2144
2145         /* NB Having prepped, we must commit... */
2146         for (i = 0; i < npages; i++)
2147                 desc->bd_frag_ops->add_kiov_frag(desc,
2148                                                  local_nb[i].lnb_page,
2149                                                  local_nb[i].lnb_page_offset,
2150                                                  local_nb[i].lnb_len);
2151
2152         rc = sptlrpc_svc_prep_bulk(req, desc);
2153         if (rc != 0)
2154                 GOTO(skip_transfer, rc);
2155
2156         rc = target_bulk_io(exp, desc, &lwi);
2157         no_reply = rc != 0;
2158
2159 skip_transfer:
2160         if (body->oa.o_valid & OBD_MD_FLCKSUM && rc == 0) {
2161                 static int cksum_counter;
2162
2163                 if (body->oa.o_valid & OBD_MD_FLFLAGS)
2164                         cksum_type = cksum_type_unpack(body->oa.o_flags);
2165
2166                 repbody->oa.o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
2167                 repbody->oa.o_flags &= ~OBD_FL_CKSUM_ALL;
2168                 repbody->oa.o_flags |= cksum_type_pack(cksum_type);
2169                 repbody->oa.o_cksum = tgt_checksum_bulk(tsi->tsi_tgt, desc,
2170                                                         OST_WRITE, cksum_type);
2171                 cksum_counter++;
2172
2173                 if (unlikely(body->oa.o_cksum != repbody->oa.o_cksum)) {
2174                         mmap = (body->oa.o_valid & OBD_MD_FLFLAGS &&
2175                                 body->oa.o_flags & OBD_FL_MMAP);
2176
2177                         tgt_warn_on_cksum(req, desc, local_nb, npages,
2178                                           body->oa.o_cksum,
2179                                           repbody->oa.o_cksum, mmap);
2180                         cksum_counter = 0;
2181                 } else if ((cksum_counter & (-cksum_counter)) ==
2182                            cksum_counter) {
2183                         CDEBUG(D_INFO, "Checksum %u from %s OK: %x\n",
2184                                cksum_counter, libcfs_id2str(req->rq_peer),
2185                                repbody->oa.o_cksum);
2186                 }
2187         }
2188
2189         /* Must commit after prep above in all cases */
2190         rc = obd_commitrw(tsi->tsi_env, OBD_BRW_WRITE, exp, &repbody->oa,
2191                           objcount, ioo, remote_nb, npages, local_nb, rc);
2192         if (rc == -ENOTCONN)
2193                 /* quota acquire process has been given up because
2194                  * either the client has been evicted or the client
2195                  * has timed out the request already */
2196                 no_reply = true;
2197
2198         /*
2199          * Disable sending mtime back to the client. If the client locked the
2200          * whole object, then it has already updated the mtime on its side,
2201          * otherwise it will have to glimpse anyway (see bug 21489, comment 32)
2202          */
2203         repbody->oa.o_valid &= ~(OBD_MD_FLMTIME | OBD_MD_FLATIME);
2204
2205         if (rc == 0) {
2206                 int nob = 0;
2207
2208                 /* set per-requested niobuf return codes */
2209                 for (i = j = 0; i < niocount; i++) {
2210                         int len = remote_nb[i].rnb_len;
2211
2212                         nob += len;
2213                         rcs[i] = 0;
2214                         do {
2215                                 LASSERT(j < npages);
2216                                 if (local_nb[j].lnb_rc < 0)
2217                                         rcs[i] = local_nb[j].lnb_rc;
2218                                 len -= local_nb[j].lnb_len;
2219                                 j++;
2220                         } while (len > 0);
2221                         LASSERT(len == 0);
2222                 }
2223                 LASSERT(j == npages);
2224                 ptlrpc_lprocfs_brw(req, nob);
2225
2226                 tgt_drop_id(exp, &repbody->oa);
2227         }
2228 out_lock:
2229         tgt_brw_unlock(ioo, remote_nb, &lockh, LCK_PW);
2230         if (desc)
2231                 ptlrpc_free_bulk(desc);
2232 out:
2233         if (no_reply) {
2234                 req->rq_no_reply = 1;
2235                 /* reply out callback would free */
2236                 ptlrpc_req_drop_rs(req);
2237                 LCONSOLE_WARN("%s: Bulk IO write error with %s (at %s), "
2238                               "client will retry: rc %d\n",
2239                               exp->exp_obd->obd_name,
2240                               obd_uuid2str(&exp->exp_client_uuid),
2241                               obd_export_nid2str(exp), rc);
2242         }
2243         memory_pressure_clr();
2244         RETURN(rc);
2245 }
2246 EXPORT_SYMBOL(tgt_brw_write);
2247
2248 /* Check if request can be reconstructed from saved reply data
2249  * A copy of the reply data is returned in @trd if the pointer is not NULL
2250  */
2251 bool req_can_reconstruct(struct ptlrpc_request *req,
2252                          struct tg_reply_data *trd)
2253 {
2254         struct tg_export_data *ted = &req->rq_export->exp_target_data;
2255         struct lsd_client_data *lcd = ted->ted_lcd;
2256         bool found;
2257
2258         if (tgt_is_multimodrpcs_client(req->rq_export))
2259                 return tgt_lookup_reply(req, trd);
2260
2261         mutex_lock(&ted->ted_lcd_lock);
2262         found = req->rq_xid == lcd->lcd_last_xid ||
2263                 req->rq_xid == lcd->lcd_last_close_xid;
2264
2265         if (found && trd != NULL) {
2266                 if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE) {
2267                         trd->trd_reply.lrd_xid = lcd->lcd_last_close_xid;
2268                         trd->trd_reply.lrd_transno =
2269                                                 lcd->lcd_last_close_transno;
2270                         trd->trd_reply.lrd_result = lcd->lcd_last_close_result;
2271                 } else {
2272                         trd->trd_reply.lrd_xid = lcd->lcd_last_xid;
2273                         trd->trd_reply.lrd_transno = lcd->lcd_last_transno;
2274                         trd->trd_reply.lrd_result = lcd->lcd_last_result;
2275                         trd->trd_reply.lrd_data = lcd->lcd_last_data;
2276                         trd->trd_pre_versions[0] = lcd->lcd_pre_versions[0];
2277                         trd->trd_pre_versions[1] = lcd->lcd_pre_versions[1];
2278                         trd->trd_pre_versions[2] = lcd->lcd_pre_versions[2];
2279                         trd->trd_pre_versions[3] = lcd->lcd_pre_versions[3];
2280                 }
2281         }
2282         mutex_unlock(&ted->ted_lcd_lock);
2283
2284         return found;
2285 }
2286 EXPORT_SYMBOL(req_can_reconstruct);
2287