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) 2013, 2017, 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 #include <linux/delay.h>
  39 #include <linux/uidgid.h>
  40
  41 #include <libcfs/linux/linux-mem.h>
  42 #include <obd.h>
  43 #include <obd_class.h>
  44 #include <obd_cksum.h>
  45 #include <lustre_lfsck.h>
  46 #include <lustre_nodemap.h>
  47 #include <lustre_acl.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 HAS_BODY 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 & HAS_BODY) && !lu_object_exists(obj)) {
 104                         lu_object_put(tsi->tsi_env, obj);
 105                         rc = -ENOENT;
 106                 } else {
 107                         tsi->tsi_corpus = obj;
 108                         rc = 0;
 109                 }
 110         } else {
 111                 rc = PTR_ERR(obj);
 112         }
 113
 114         tsi->tsi_fid = body->mbo_fid1;
 115
 116         RETURN(rc);
 117 }
 118
 119 /**
 120  * Validate oa from client.
 121  * If the request comes from 2.0 clients, currently only RSVD seq and IDIF
 122  * req are valid.
 123  *    a. objects in Single MDT FS  seq = FID_SEQ_OST_MDT0, oi_id != 0
 124  *    b. Echo objects(seq = 2), old echo client still use oi_id/oi_seq to
 125  *       pack ost_id. Because non-zero oi_seq will make it diffcult to tell
 126  *       whether this is oi_fid or real ostid. So it will check
 127  *       OBD_CONNECT_FID, then convert the ostid to FID for old client.
 128  *    c. Old FID-disable osc will send IDIF.
 129  *    d. new FID-enable osc/osp will send normal FID.
 130  *
 131  * And also oi_id/f_oid should always start from 1. oi_id/f_oid = 0 will
 132  * be used for LAST_ID file, and only being accessed inside OST now.
 133  */
 134 int tgt_validate_obdo(struct tgt_session_info *tsi, struct obdo *oa)
 135 {
 136         struct ost_id   *oi     = &oa->o_oi;
 137         u64              seq    = ostid_seq(oi);
 138         u64              id     = ostid_id(oi);
 139         int              rc;
 140         ENTRY;
 141
 142         if (unlikely(!(exp_connect_flags(tsi->tsi_exp) & OBD_CONNECT_FID) &&
 143                      fid_seq_is_echo(seq))) {
 144                 /* Sigh 2.[123] client still sends echo req with oi_id = 0
 145                  * during create, and we will reset this to 1, since this
 146                  * oi_id is basically useless in the following create process,
 147                  * but oi_id == 0 will make it difficult to tell whether it is
 148                  * real FID or ost_id. */
 149                 oi->oi_fid.f_seq = FID_SEQ_ECHO;
 150                 oi->oi_fid.f_oid = id ?: 1;
 151                 oi->oi_fid.f_ver = 0;
 152         } else {
 153                 struct tgt_thread_info *tti = tgt_th_info(tsi->tsi_env);
 154
 155                 if (unlikely((oa->o_valid & OBD_MD_FLID) && id == 0))
 156                         GOTO(out, rc = -EPROTO);
 157
 158                 /* Note: this check might be forced in 2.5 or 2.6, i.e.
 159                  * all of the requests are required to setup FLGROUP */
 160                 if (unlikely(!(oa->o_valid & OBD_MD_FLGROUP))) {
 161                         ostid_set_seq_mdt0(oi);
 162                         oa->o_valid |= OBD_MD_FLGROUP;
 163                         seq = ostid_seq(oi);
 164                 }
 165
 166                 if (unlikely(!(fid_seq_is_idif(seq) || fid_seq_is_mdt0(seq) ||
 167                                fid_seq_is_norm(seq) || fid_seq_is_echo(seq))))
 168                         GOTO(out, rc = -EPROTO);
 169
 170                 rc = ostid_to_fid(&tti->tti_fid1, oi,
 171                                   tsi->tsi_tgt->lut_lsd.lsd_osd_index);
 172                 if (unlikely(rc != 0))
 173                         GOTO(out, rc);
 174
 175                 oi->oi_fid = tti->tti_fid1;
 176         }
 177
 178         RETURN(0);
 179
 180 out:
 181         CERROR("%s: client %s sent bad object "DOSTID": rc = %d\n",
 182                tgt_name(tsi->tsi_tgt), obd_export_nid2str(tsi->tsi_exp),
 183                seq, id, rc);
 184         return rc;
 185 }
 186 EXPORT_SYMBOL(tgt_validate_obdo);
 187
 188 static int tgt_io_data_unpack(struct tgt_session_info *tsi, struct ost_id *oi)
 189 {
 190         unsigned                 max_brw;
 191         struct niobuf_remote    *rnb;
 192         struct obd_ioobj        *ioo;
 193         int                      obj_count;
 194
 195         ENTRY;
 196
 197         ioo = req_capsule_client_get(tsi->tsi_pill, &RMF_OBD_IOOBJ);
 198         if (ioo == NULL)
 199                 RETURN(-EPROTO);
 200
 201         rnb = req_capsule_client_get(tsi->tsi_pill, &RMF_NIOBUF_REMOTE);
 202         if (rnb == NULL)
 203                 RETURN(-EPROTO);
 204
 205         max_brw = ioobj_max_brw_get(ioo);
 206         if (unlikely((max_brw & (max_brw - 1)) != 0)) {
 207                 CERROR("%s: client %s sent bad ioobj max %u for "DOSTID
 208                        ": rc = %d\n", tgt_name(tsi->tsi_tgt),
 209                        obd_export_nid2str(tsi->tsi_exp), max_brw,
 210                        POSTID(oi), -EPROTO);
 211                 RETURN(-EPROTO);
 212         }
 213         ioo->ioo_oid = *oi;
 214
 215         obj_count = req_capsule_get_size(tsi->tsi_pill, &RMF_OBD_IOOBJ,
 216                                         RCL_CLIENT) / sizeof(*ioo);
 217         if (obj_count == 0) {
 218                 CERROR("%s: short ioobj\n", tgt_name(tsi->tsi_tgt));
 219                 RETURN(-EPROTO);
 220         } else if (obj_count > 1) {
 221                 CERROR("%s: too many ioobjs (%d)\n", tgt_name(tsi->tsi_tgt),
 222                        obj_count);
 223                 RETURN(-EPROTO);
 224         }
 225
 226         if (ioo->ioo_bufcnt == 0) {
 227                 CERROR("%s: ioo has zero bufcnt\n", tgt_name(tsi->tsi_tgt));
 228                 RETURN(-EPROTO);
 229         }
 230
 231         if (ioo->ioo_bufcnt > PTLRPC_MAX_BRW_PAGES) {
 232                 DEBUG_REQ(D_RPCTRACE, tgt_ses_req(tsi),
 233                           "bulk has too many pages (%d)",
 234                           ioo->ioo_bufcnt);
 235                 RETURN(-EPROTO);
 236         }
 237
 238         RETURN(0);
 239 }
 240
 241 static int tgt_ost_body_unpack(struct tgt_session_info *tsi, __u32 flags)
 242 {
 243         struct ost_body         *body;
 244         struct req_capsule      *pill = tsi->tsi_pill;
 245         struct lu_nodemap       *nodemap;
 246         int                      rc;
 247
 248         ENTRY;
 249
 250         body = req_capsule_client_get(pill, &RMF_OST_BODY);
 251         if (body == NULL)
 252                 RETURN(-EFAULT);
 253
 254         rc = tgt_validate_obdo(tsi, &body->oa);
 255         if (rc)
 256                 RETURN(rc);
 257
 258         nodemap = nodemap_get_from_exp(tsi->tsi_exp);
 259         if (IS_ERR(nodemap))
 260                 RETURN(PTR_ERR(nodemap));
 261
 262         body->oa.o_uid = nodemap_map_id(nodemap, NODEMAP_UID,
 263                                         NODEMAP_CLIENT_TO_FS,
 264                                         body->oa.o_uid);
 265         body->oa.o_gid = nodemap_map_id(nodemap, NODEMAP_GID,
 266                                         NODEMAP_CLIENT_TO_FS,
 267                                         body->oa.o_gid);
 268         nodemap_putref(nodemap);
 269
 270         tsi->tsi_ost_body = body;
 271         tsi->tsi_fid = body->oa.o_oi.oi_fid;
 272
 273         if (req_capsule_has_field(pill, &RMF_OBD_IOOBJ, RCL_CLIENT)) {
 274                 rc = tgt_io_data_unpack(tsi, &body->oa.o_oi);
 275                 if (rc < 0)
 276                         RETURN(rc);
 277         }
 278
 279         if (!(body->oa.o_valid & OBD_MD_FLID)) {
 280                 if (flags & HAS_BODY) {
 281                         CERROR("%s: OBD_MD_FLID flag is not set in ost_body but OID/FID is mandatory with HAS_BODY\n",
 282                                tgt_name(tsi->tsi_tgt));
 283                         RETURN(-EPROTO);
 284                 } else {
 285                         RETURN(0);
 286                 }
 287         }
 288
 289         ost_fid_build_resid(&tsi->tsi_fid, &tsi->tsi_resid);
 290
 291         /*
 292          * OST doesn't get object in advance for further use to prevent
 293          * situations with nested object_find which is potential deadlock.
 294          */
 295         tsi->tsi_corpus = NULL;
 296         RETURN(rc);
 297 }
 298
 299 /*
 300  * Do necessary preprocessing according to handler ->th_flags.
 301  */
 302 static int tgt_request_preprocess(struct tgt_session_info *tsi,
 303                                   struct tgt_handler *h,
 304                                   struct ptlrpc_request *req)
 305 {
 306         struct req_capsule      *pill = tsi->tsi_pill;
 307         __u32                    flags = h->th_flags;
 308         int                      rc = 0;
 309
 310         ENTRY;
 311
 312         if (tsi->tsi_preprocessed)
 313                 RETURN(0);
 314
 315         LASSERT(h->th_act != NULL);
 316         LASSERT(h->th_opc == lustre_msg_get_opc(req->rq_reqmsg));
 317         LASSERT(current->journal_info == NULL);
 318
 319         LASSERT(ergo(flags & (HAS_BODY | HAS_REPLY),
 320                      h->th_fmt != NULL));
 321         if (h->th_fmt != NULL) {
 322                 req_capsule_set(pill, h->th_fmt);
 323                 if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_CLIENT) &&
 324                     req_capsule_field_present(pill, &RMF_MDT_BODY,
 325                                               RCL_CLIENT)) {
 326                         rc = tgt_mdt_body_unpack(tsi, flags);
 327                         if (rc < 0)
 328                                 RETURN(rc);
 329                 } else if (req_capsule_has_field(pill, &RMF_OST_BODY,
 330                                                  RCL_CLIENT) &&
 331                            req_capsule_field_present(pill, &RMF_OST_BODY,
 332                                                  RCL_CLIENT)) {
 333                         rc = tgt_ost_body_unpack(tsi, flags);
 334                         if (rc < 0)
 335                                 RETURN(rc);
 336                 }
 337         }
 338
 339         if (flags & IS_MUTABLE && tgt_conn_flags(tsi) & OBD_CONNECT_RDONLY)
 340                 RETURN(-EROFS);
 341
 342         if (flags & HAS_KEY) {
 343                 struct ldlm_request *dlm_req;
 344
 345                 LASSERT(h->th_fmt != NULL);
 346
 347                 dlm_req = req_capsule_client_get(pill, &RMF_DLM_REQ);
 348                 if (dlm_req != NULL) {
 349                         union ldlm_wire_policy_data *policy =
 350                                         &dlm_req->lock_desc.l_policy_data;
 351
 352                         if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
 353                                      LDLM_IBITS &&
 354                                      (policy->l_inodebits.bits |
 355                                       policy->l_inodebits.try_bits) == 0)) {
 356                                 /*
 357                                  * Lock without inodebits makes no sense and
 358                                  * will oops later in ldlm. If client miss to
 359                                  * set such bits, do not trigger ASSERTION.
 360                                  *
 361                                  * For liblustre flock case, it maybe zero.
 362                                  */
 363                                 rc = -EPROTO;
 364                         } else {
 365                                 tsi->tsi_dlm_req = dlm_req;
 366                         }
 367                 } else {
 368                         rc = -EFAULT;
 369                 }
 370         }
 371         tsi->tsi_preprocessed = 1;
 372         RETURN(rc);
 373 }
 374
 375 /*
 376  * Invoke handler for this request opc. Also do necessary preprocessing
 377  * (according to handler ->th_flags), and post-processing (setting of
 378  * ->last_{xid,committed}).
 379  */
 380 static int tgt_handle_request0(struct tgt_session_info *tsi,
 381                                struct tgt_handler *h,
 382                                struct ptlrpc_request *req)
 383 {
 384         int      serious = 0;
 385         int      rc;
 386         __u32    opc = lustre_msg_get_opc(req->rq_reqmsg);
 387
 388         ENTRY;
 389
 390
 391         /* When dealing with sec context requests, no export is associated yet,
 392          * because these requests are sent before *_CONNECT requests.
 393          * A NULL req->rq_export means the normal *_common_slice handlers will
 394          * not be called, because there is no reference to the target.
 395          * So deal with them by hand and jump directly to target_send_reply().
 396          */
 397         switch (opc) {
 398         case SEC_CTX_INIT:
 399         case SEC_CTX_INIT_CONT:
 400         case SEC_CTX_FINI:
 401                 CFS_FAIL_TIMEOUT(OBD_FAIL_SEC_CTX_HDL_PAUSE, cfs_fail_val);
 402                 GOTO(out, rc = 0);
 403         }
 404
 405         /*
 406          * Checking for various OBD_FAIL_$PREF_$OPC_NET codes. _Do_ not try
 407          * to put same checks into handlers like mdt_close(), mdt_reint(),
 408          * etc., without talking to mdt authors first. Checking same thing
 409          * there again is useless and returning 0 error without packing reply
 410          * is buggy! Handlers either pack reply or return error.
 411          *
 412          * We return 0 here and do not send any reply in order to emulate
 413          * network failure. Do not send any reply in case any of NET related
 414          * fail_id has occured.
 415          */
 416         if (OBD_FAIL_CHECK_ORSET(h->th_fail_id, OBD_FAIL_ONCE))
 417                 RETURN(0);
 418         if (unlikely(lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT &&
 419                      OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_MULTI_NET)))
 420                 RETURN(0);
 421
 422         rc = tgt_request_preprocess(tsi, h, req);
 423         /* pack reply if reply format is fixed */
 424         if (rc == 0 && h->th_flags & HAS_REPLY) {
 425                 /* Pack reply */
 426                 if (req_capsule_has_field(tsi->tsi_pill, &RMF_MDT_MD,
 427                                           RCL_SERVER))
 428                         req_capsule_set_size(tsi->tsi_pill, &RMF_MDT_MD,
 429                                              RCL_SERVER,
 430                                              tsi->tsi_mdt_body->mbo_eadatasize);
 431                 if (req_capsule_has_field(tsi->tsi_pill, &RMF_LOGCOOKIES,
 432                                           RCL_SERVER))
 433                         req_capsule_set_size(tsi->tsi_pill, &RMF_LOGCOOKIES,
 434                                              RCL_SERVER, 0);
 435                 if (req_capsule_has_field(tsi->tsi_pill, &RMF_ACL, RCL_SERVER))
 436                         req_capsule_set_size(tsi->tsi_pill,
 437                                              &RMF_ACL, RCL_SERVER,
 438                                              LUSTRE_POSIX_ACL_MAX_SIZE_OLD);
 439
 440                 if (req_capsule_has_field(tsi->tsi_pill, &RMF_SHORT_IO,
 441                                           RCL_SERVER)) {
 442                         struct niobuf_remote *remote_nb =
 443                                 req_capsule_client_get(tsi->tsi_pill,
 444                                                        &RMF_NIOBUF_REMOTE);
 445                         struct ost_body *body = tsi->tsi_ost_body;
 446
 447                         req_capsule_set_size(tsi->tsi_pill, &RMF_SHORT_IO,
 448                                          RCL_SERVER,
 449                                          (body->oa.o_valid & OBD_MD_FLFLAGS &&
 450                                           body->oa.o_flags & OBD_FL_SHORT_IO) ?
 451                                          remote_nb[0].rnb_len : 0);
 452                 }
 453
 454                 rc = req_capsule_server_pack(tsi->tsi_pill);
 455         }
 456
 457         if (likely(rc == 0)) {
 458                 /*
 459                  * Process request, there can be two types of rc:
 460                  * 1) errors with msg unpack/pack, other failures outside the
 461                  * operation itself. This is counted as serious errors;
 462                  * 2) errors during fs operation, should be placed in rq_status
 463                  * only
 464                  */
 465                 rc = h->th_act(tsi);
 466                 if (!is_serious(rc) &&
 467                     !req->rq_no_reply && req->rq_reply_state == NULL) {
 468                         DEBUG_REQ(D_ERROR, req,
 469                                   "%s: %s handler did not pack reply but returned no error",
 470                                   tgt_name(tsi->tsi_tgt), h->th_name);
 471                         LBUG();
 472                 }
 473                 serious = is_serious(rc);
 474                 rc = clear_serious(rc);
 475         } else {
 476                 serious = 1;
 477         }
 478
 479         req->rq_status = rc;
 480
 481         /*
 482          * ELDLM_* codes which > 0 should be in rq_status only as well as
 483          * all non-serious errors.
 484          */
 485         if (rc > 0 || !serious)
 486                 rc = 0;
 487
 488         LASSERT(current->journal_info == NULL);
 489
 490         if (likely(rc == 0 && req->rq_export))
 491                 target_committed_to_req(req);
 492
 493 out:
 494         target_send_reply(req, rc, tsi->tsi_reply_fail_id);
 495         RETURN(0);
 496 }
 497
 498 static int tgt_filter_recovery_request(struct ptlrpc_request *req,
 499                                        struct obd_device *obd, int *process)
 500 {
 501         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
 502         case MDS_DISCONNECT:
 503         case OST_DISCONNECT:
 504         case OBD_IDX_READ:
 505                 *process = 1;
 506                 RETURN(0);
 507         case MDS_CLOSE:
 508         case MDS_SYNC: /* used in unmounting */
 509         case OBD_PING:
 510         case MDS_REINT:
 511         case OUT_UPDATE:
 512         case SEQ_QUERY:
 513         case FLD_QUERY:
 514         case FLD_READ:
 515         case LDLM_ENQUEUE:
 516         case OST_CREATE:
 517         case OST_DESTROY:
 518         case OST_PUNCH:
 519         case OST_SETATTR:
 520         case OST_SYNC:
 521         case OST_WRITE:
 522         case MDS_HSM_PROGRESS:
 523         case MDS_HSM_STATE_SET:
 524         case MDS_HSM_REQUEST:
 525         case OST_FALLOCATE:
 526                 *process = target_queue_recovery_request(req, obd);
 527                 RETURN(0);
 528
 529         default:
 530                 DEBUG_REQ(D_ERROR, req, "not permitted during recovery");
 531                 *process = -EAGAIN;
 532                 RETURN(0);
 533         }
 534 }
 535
 536 /*
 537  * Handle recovery. Return:
 538  *        +1: continue request processing;
 539  *       -ve: abort immediately with the given error code;
 540  *         0: send reply with error code in req->rq_status;
 541  */
 542 static int tgt_handle_recovery(struct ptlrpc_request *req, int reply_fail_id)
 543 {
 544         ENTRY;
 545
 546         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
 547         case MDS_CONNECT:
 548         case OST_CONNECT:
 549         case MGS_CONNECT:
 550         case SEC_CTX_INIT:
 551         case SEC_CTX_INIT_CONT:
 552         case SEC_CTX_FINI:
 553                 RETURN(+1);
 554         }
 555
 556         if (!req->rq_export->exp_obd->obd_replayable)
 557                 RETURN(+1);
 558
 559         /* sanity check: if the xid matches, the request must be marked as a
 560          * resent or replayed */
 561         if (req_can_reconstruct(req, NULL) == 1) {
 562                 if (!(lustre_msg_get_flags(req->rq_reqmsg) &
 563                       (MSG_RESENT | MSG_REPLAY))) {
 564                         DEBUG_REQ(D_WARNING, req,
 565                                   "rq_xid=%llu matches saved XID, expected REPLAY or RESENT flag (%x)",
 566                                   req->rq_xid,
 567                                   lustre_msg_get_flags(req->rq_reqmsg));
 568                         req->rq_status = -ENOTCONN;
 569                         RETURN(-ENOTCONN);
 570                 }
 571         }
 572         /* else: note the opposite is not always true; a RESENT req after a
 573          * failover will usually not match the last_xid, since it was likely
 574          * never committed. A REPLAYed request will almost never match the
 575          * last xid, however it could for a committed, but still retained,
 576          * open. */
 577
 578         /* Check for aborted recovery... */
 579         if (unlikely(req->rq_export->exp_obd->obd_recovering)) {
 580                 int rc;
 581                 int should_process;
 582
 583                 DEBUG_REQ(D_INFO, req, "Got new replay");
 584                 rc = tgt_filter_recovery_request(req, req->rq_export->exp_obd,
 585                                                  &should_process);
 586                 if (rc != 0 || !should_process)
 587                         RETURN(rc);
 588                 else if (should_process < 0) {
 589                         req->rq_status = should_process;
 590                         rc = ptlrpc_error(req);
 591                         RETURN(rc);
 592                 }
 593         }
 594         RETURN(+1);
 595 }
 596
 597 /* Initial check for request, it is validation mostly */
 598 static struct tgt_handler *tgt_handler_find_check(struct ptlrpc_request *req)
 599 {
 600         struct tgt_handler      *h;
 601         struct tgt_opc_slice    *s;
 602         struct lu_target        *tgt;
 603         __u32                    opc = lustre_msg_get_opc(req->rq_reqmsg);
 604
 605         ENTRY;
 606
 607         tgt = class_exp2tgt(req->rq_export);
 608         if (unlikely(tgt == NULL)) {
 609                 DEBUG_REQ(D_ERROR, req, "%s: no target for connected export",
 610                           class_exp2obd(req->rq_export)->obd_name);
 611                 RETURN(ERR_PTR(-EINVAL));
 612         }
 613
 614         for (s = tgt->lut_slice; s->tos_hs != NULL; s++)
 615                 if (s->tos_opc_start <= opc && opc < s->tos_opc_end)
 616                         break;
 617
 618         /* opcode was not found in slice */
 619         if (unlikely(s->tos_hs == NULL)) {
 620                 CERROR("%s: no handlers for opcode 0x%x\n", tgt_name(tgt),
 621                        opc);
 622                 RETURN(ERR_PTR(-ENOTSUPP));
 623         }
 624
 625         LASSERT(opc >= s->tos_opc_start && opc < s->tos_opc_end);
 626         h = s->tos_hs + (opc - s->tos_opc_start);
 627         if (unlikely(h->th_opc == 0)) {
 628                 CERROR("%s: unsupported opcode 0x%x\n", tgt_name(tgt), opc);
 629                 RETURN(ERR_PTR(-ENOTSUPP));
 630         }
 631
 632         RETURN(h);
 633 }
 634
 635 static int process_req_last_xid(struct ptlrpc_request *req)
 636 {
 637         __u64   last_xid;
 638         int rc = 0;
 639         struct obd_export *exp = req->rq_export;
 640         struct tg_export_data *ted = &exp->exp_target_data;
 641         bool need_lock = tgt_is_multimodrpcs_client(exp);
 642         ENTRY;
 643
 644         if (need_lock)
 645                 mutex_lock(&ted->ted_lcd_lock);
 646         /* check request's xid is consistent with export's last_xid */
 647         last_xid = lustre_msg_get_last_xid(req->rq_reqmsg);
 648         if (last_xid > exp->exp_last_xid)
 649                 exp->exp_last_xid = last_xid;
 650
 651         if (req->rq_xid == 0 || req->rq_xid <= exp->exp_last_xid) {
 652                 /* Some request is allowed to be sent during replay,
 653                  * such as OUT update requests, FLD requests, so it
 654                  * is possible that replay requests has smaller XID
 655                  * than the exp_last_xid.
 656                  *
 657                  * Some non-replay requests may have smaller XID as
 658                  * well:
 659                  *
 660                  * - Client send a no_resend RPC, like statfs;
 661                  * - The RPC timedout (or some other error) on client,
 662                  *   then it's removed from the unreplied list;
 663                  * - Client send some other request to bump the
 664                  *   exp_last_xid on server;
 665                  * - The former RPC got chance to be processed;
 666                  */
 667                 if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY))
 668                         rc = -EPROTO;
 669
 670                 DEBUG_REQ(D_WARNING, req,
 671                           "unexpected xid=%llx != exp_last_xid=%llx, rc = %d",
 672                           req->rq_xid, exp->exp_last_xid, rc);
 673                 if (rc)
 674                         GOTO(out, rc);
 675         }
 676
 677         /* The "last_xid" is the minimum xid among unreplied requests,
 678          * if the request is from the previous connection, its xid can
 679          * still be larger than "exp_last_xid", then the above check of
 680          * xid is not enough to determine whether the request is delayed.
 681          *
 682          * For example, if some replay request was delayed and caused
 683          * timeout at client and the replay is restarted, the delayed
 684          * replay request will have the larger xid than "exp_last_xid"
 685          */
 686         if (req->rq_export->exp_conn_cnt >
 687             lustre_msg_get_conn_cnt(req->rq_reqmsg))
 688                 GOTO(out, rc = -ESTALE);
 689
 690         /* try to release in-memory reply data */
 691         if (tgt_is_multimodrpcs_client(exp)) {
 692                 tgt_handle_received_xid(exp, last_xid);
 693                 rc = tgt_handle_tag(req);
 694         }
 695
 696 out:
 697         if (need_lock)
 698                 mutex_unlock(&ted->ted_lcd_lock);
 699
 700         RETURN(rc);
 701 }
 702
 703 int tgt_request_handle(struct ptlrpc_request *req)
 704 {
 705         struct tgt_session_info *tsi = tgt_ses_info(req->rq_svc_thread->t_env);
 706
 707         struct lustre_msg       *msg = req->rq_reqmsg;
 708         struct tgt_handler      *h;
 709         struct lu_target        *tgt;
 710         int                      request_fail_id = 0;
 711         __u32                    opc = lustre_msg_get_opc(msg);
 712         struct obd_device       *obd;
 713         int                      rc;
 714         bool                     is_connect = false;
 715         ENTRY;
 716
 717         if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_TGT_RECOVERY_REQ_RACE))) {
 718                 if (cfs_fail_val == 0 &&
 719                     lustre_msg_get_opc(msg) != OBD_PING &&
 720                     lustre_msg_get_flags(msg) & MSG_REQ_REPLAY_DONE) {
 721                         cfs_fail_val = 1;
 722                         cfs_race_state = 0;
 723                         wait_event_idle(cfs_race_waitq, (cfs_race_state == 1));
 724                 }
 725         }
 726
 727         req_capsule_init(&req->rq_pill, req, RCL_SERVER);
 728         tsi->tsi_pill = &req->rq_pill;
 729         tsi->tsi_env = req->rq_svc_thread->t_env;
 730
 731         /* if request has export then get handlers slice from corresponding
 732          * target, otherwise that should be connect operation */
 733         if (opc == MDS_CONNECT || opc == OST_CONNECT ||
 734             opc == MGS_CONNECT) {
 735                 is_connect = true;
 736                 req_capsule_set(&req->rq_pill, &RQF_CONNECT);
 737                 rc = target_handle_connect(req);
 738                 if (rc != 0) {
 739                         rc = ptlrpc_error(req);
 740                         GOTO(out, rc);
 741                 }
 742                 /* recovery-small test 18c asks to drop connect reply */
 743                 if (unlikely(opc == OST_CONNECT &&
 744                              OBD_FAIL_CHECK(OBD_FAIL_OST_CONNECT_NET2)))
 745                         GOTO(out, rc = 0);
 746         }
 747
 748         if (unlikely(!class_connected_export(req->rq_export))) {
 749                 if (opc == SEC_CTX_INIT || opc == SEC_CTX_INIT_CONT ||
 750                     opc == SEC_CTX_FINI) {
 751                         /* sec context initialization has to be handled
 752                          * by hand in tgt_handle_request0() */
 753                         tsi->tsi_reply_fail_id = OBD_FAIL_SEC_CTX_INIT_NET;
 754                         h = NULL;
 755                         GOTO(handle_recov, rc = 0);
 756                 }
 757                 CDEBUG(D_HA, "operation %d on unconnected OST from %s\n",
 758                        opc, libcfs_id2str(req->rq_peer));
 759                 req->rq_status = -ENOTCONN;
 760                 rc = ptlrpc_error(req);
 761                 GOTO(out, rc);
 762         }
 763
 764         tsi->tsi_tgt = tgt = class_exp2tgt(req->rq_export);
 765         tsi->tsi_exp = req->rq_export;
 766         if (exp_connect_flags(req->rq_export) & OBD_CONNECT_JOBSTATS)
 767                 tsi->tsi_jobid = lustre_msg_get_jobid(req->rq_reqmsg);
 768         else
 769                 tsi->tsi_jobid = NULL;
 770
 771         if (tgt == NULL) {
 772                 DEBUG_REQ(D_ERROR, req, "%s: No target for connected export",
 773                           class_exp2obd(req->rq_export)->obd_name);
 774                 req->rq_status = -EINVAL;
 775                 rc = ptlrpc_error(req);
 776                 GOTO(out, rc);
 777         }
 778
 779         /* Skip last_xid processing for the recovery thread, otherwise, the
 780          * last_xid on same request could be processed twice: first time when
 781          * processing the incoming request, second time when the request is
 782          * being processed by recovery thread. */
 783         obd = class_exp2obd(req->rq_export);
 784         if (is_connect) {
 785                 /* reset the exp_last_xid on each connection. */
 786                 req->rq_export->exp_last_xid = 0;
 787         } else if (obd->obd_recovery_data.trd_processing_task !=
 788                    current->pid) {
 789                 rc = process_req_last_xid(req);
 790                 if (rc) {
 791                         req->rq_status = rc;
 792                         rc = ptlrpc_error(req);
 793                         GOTO(out, rc);
 794                 }
 795         }
 796
 797         request_fail_id = tgt->lut_request_fail_id;
 798         tsi->tsi_reply_fail_id = tgt->lut_reply_fail_id;
 799
 800         h = tgt_handler_find_check(req);
 801         if (IS_ERR(h)) {
 802                 req->rq_status = PTR_ERR(h);
 803                 rc = ptlrpc_error(req);
 804                 GOTO(out, rc);
 805         }
 806
 807         LASSERTF(h->th_opc == opc, "opcode mismatch %d != %d\n",
 808                  h->th_opc, opc);
 809
 810         if ((cfs_fail_val == 0 || cfs_fail_val == opc) &&
 811              CFS_FAIL_CHECK_ORSET(request_fail_id, CFS_FAIL_ONCE))
 812                 GOTO(out, rc = 0);
 813
 814         rc = lustre_msg_check_version(msg, h->th_version);
 815         if (unlikely(rc)) {
 816                 DEBUG_REQ(D_ERROR, req,
 817                           "%s: drop malformed request version=%08x expect=%08x",
 818                           tgt_name(tgt), lustre_msg_get_version(msg),
 819                           h->th_version);
 820                 req->rq_status = -EINVAL;
 821                 rc = ptlrpc_error(req);
 822                 GOTO(out, rc);
 823         }
 824
 825 handle_recov:
 826         rc = tgt_handle_recovery(req, tsi->tsi_reply_fail_id);
 827         if (likely(rc == 1)) {
 828                 rc = tgt_handle_request0(tsi, h, req);
 829                 if (rc)
 830                         GOTO(out, rc);
 831         }
 832         EXIT;
 833 out:
 834         req_capsule_fini(tsi->tsi_pill);
 835         if (tsi->tsi_corpus != NULL) {
 836                 lu_object_put(tsi->tsi_env, tsi->tsi_corpus);
 837                 tsi->tsi_corpus = NULL;
 838         }
 839         return rc;
 840 }
 841 EXPORT_SYMBOL(tgt_request_handle);
 842
 843 /** Assign high priority operations to the request if needed. */
 844 int tgt_hpreq_handler(struct ptlrpc_request *req)
 845 {
 846         struct tgt_session_info *tsi = tgt_ses_info(req->rq_svc_thread->t_env);
 847         struct tgt_handler      *h;
 848         int                      rc;
 849
 850         ENTRY;
 851
 852         if (req->rq_export == NULL)
 853                 RETURN(0);
 854
 855         req_capsule_init(&req->rq_pill, req, RCL_SERVER);
 856         tsi->tsi_pill = &req->rq_pill;
 857         tsi->tsi_env = req->rq_svc_thread->t_env;
 858         tsi->tsi_tgt = class_exp2tgt(req->rq_export);
 859         tsi->tsi_exp = req->rq_export;
 860
 861         h = tgt_handler_find_check(req);
 862         if (IS_ERR(h)) {
 863                 rc = PTR_ERR(h);
 864                 RETURN(rc);
 865         }
 866
 867         rc = tgt_request_preprocess(tsi, h, req);
 868         if (unlikely(rc != 0))
 869                 RETURN(rc);
 870
 871         if (h->th_hp != NULL)
 872                 h->th_hp(tsi);
 873         RETURN(0);
 874 }
 875 EXPORT_SYMBOL(tgt_hpreq_handler);
 876
 877 void tgt_counter_incr(struct obd_export *exp, int opcode)
 878 {
 879         lprocfs_counter_incr(exp->exp_obd->obd_stats, opcode);
 880         if (exp->exp_nid_stats && exp->exp_nid_stats->nid_stats != NULL)
 881                 lprocfs_counter_incr(exp->exp_nid_stats->nid_stats, opcode);
 882 }
 883 EXPORT_SYMBOL(tgt_counter_incr);
 884
 885 /*
 886  * Unified target generic handlers.
 887  */
 888
 889 int tgt_connect_check_sptlrpc(struct ptlrpc_request *req, struct obd_export *exp)
 890 {
 891         struct lu_target *tgt = class_exp2tgt(exp);
 892         struct sptlrpc_flavor flvr;
 893         int rc = 0;
 894
 895         LASSERT(tgt);
 896         LASSERT(tgt->lut_obd);
 897         LASSERT(tgt->lut_slice);
 898
 899         /* always allow ECHO client */
 900         if (unlikely(strcmp(exp->exp_obd->obd_type->typ_name,
 901                             LUSTRE_ECHO_NAME) == 0)) {
 902                 exp->exp_flvr.sf_rpc = SPTLRPC_FLVR_ANY;
 903                 return 0;
 904         }
 905
 906         if (exp->exp_flvr.sf_rpc == SPTLRPC_FLVR_INVALID) {
 907                 read_lock(&tgt->lut_sptlrpc_lock);
 908                 sptlrpc_target_choose_flavor(&tgt->lut_sptlrpc_rset,
 909                                              req->rq_sp_from,
 910                                              req->rq_peer.nid,
 911                                              &flvr);
 912                 read_unlock(&tgt->lut_sptlrpc_lock);
 913
 914                 spin_lock(&exp->exp_lock);
 915                 exp->exp_sp_peer = req->rq_sp_from;
 916                 exp->exp_flvr = flvr;
 917
 918                 /* when on mgs, if no restriction is set, or if client
 919                  * is loopback, allow any flavor */
 920                 if ((strcmp(exp->exp_obd->obd_type->typ_name,
 921                            LUSTRE_MGS_NAME) == 0) &&
 922                      (exp->exp_flvr.sf_rpc == SPTLRPC_FLVR_NULL ||
 923                       exp->exp_connection->c_peer.nid == LNET_NID_LO_0))
 924                         exp->exp_flvr.sf_rpc = SPTLRPC_FLVR_ANY;
 925
 926                 if (exp->exp_flvr.sf_rpc != SPTLRPC_FLVR_ANY &&
 927                     exp->exp_flvr.sf_rpc != req->rq_flvr.sf_rpc) {
 928                         CERROR("%s: unauthorized rpc flavor %x from %s, "
 929                                "expect %x\n", tgt_name(tgt),
 930                                req->rq_flvr.sf_rpc,
 931                                libcfs_nid2str(req->rq_peer.nid),
 932                                exp->exp_flvr.sf_rpc);
 933                         rc = -EACCES;
 934                 }
 935                 spin_unlock(&exp->exp_lock);
 936         } else {
 937                 if (exp->exp_sp_peer != req->rq_sp_from) {
 938                         CERROR("%s: RPC source %s doesn't match %s\n",
 939                                tgt_name(tgt),
 940                                sptlrpc_part2name(req->rq_sp_from),
 941                                sptlrpc_part2name(exp->exp_sp_peer));
 942                         rc = -EACCES;
 943                 } else {
 944                         rc = sptlrpc_target_export_check(exp, req);
 945                 }
 946         }
 947
 948         return rc;
 949 }
 950
 951 int tgt_adapt_sptlrpc_conf(struct lu_target *tgt)
 952 {
 953         struct sptlrpc_rule_set  tmp_rset;
 954         int                      rc;
 955
 956         if (unlikely(tgt == NULL)) {
 957                 CERROR("No target passed");
 958                 return -EINVAL;
 959         }
 960
 961         sptlrpc_rule_set_init(&tmp_rset);
 962         rc = sptlrpc_conf_target_get_rules(tgt->lut_obd, &tmp_rset);
 963         if (rc) {
 964                 CERROR("%s: failed get sptlrpc rules: rc = %d\n",
 965                        tgt_name(tgt), rc);
 966                 return rc;
 967         }
 968
 969         sptlrpc_target_update_exp_flavor(tgt->lut_obd, &tmp_rset);
 970
 971         write_lock(&tgt->lut_sptlrpc_lock);
 972         sptlrpc_rule_set_free(&tgt->lut_sptlrpc_rset);
 973         tgt->lut_sptlrpc_rset = tmp_rset;
 974         write_unlock(&tgt->lut_sptlrpc_lock);
 975
 976         return 0;
 977 }
 978 EXPORT_SYMBOL(tgt_adapt_sptlrpc_conf);
 979
 980 int tgt_connect(struct tgt_session_info *tsi)
 981 {
 982         struct ptlrpc_request   *req = tgt_ses_req(tsi);
 983         struct obd_connect_data *reply;
 984         int                      rc;
 985
 986         ENTRY;
 987
 988         /* XXX: better to call this check right after getting new export but
 989          * before last_rcvd slot allocation to avoid server load upon insecure
 990          * connects. This is to be fixed after unifiyng all targets.
 991          */
 992         rc = tgt_connect_check_sptlrpc(req, tsi->tsi_exp);
 993         if (rc)
 994                 GOTO(out, rc);
 995
 996         /* To avoid exposing partially initialized connection flags, changes up
 997          * to this point have been staged in reply->ocd_connect_flags. Now that
 998          * connection handling has completed successfully, atomically update
 999          * the connect flags in the shared export data structure. LU-1623 */
1000         reply = req_capsule_server_get(tsi->tsi_pill, &RMF_CONNECT_DATA);
1001         spin_lock(&tsi->tsi_exp->exp_lock);
1002         *exp_connect_flags_ptr(tsi->tsi_exp) = reply->ocd_connect_flags;
1003         if (reply->ocd_connect_flags & OBD_CONNECT_FLAGS2)
1004                 *exp_connect_flags2_ptr(tsi->tsi_exp) =
1005                         reply->ocd_connect_flags2;
1006         tsi->tsi_exp->exp_connect_data.ocd_brw_size = reply->ocd_brw_size;
1007         spin_unlock(&tsi->tsi_exp->exp_lock);
1008
1009         if (strcmp(tsi->tsi_exp->exp_obd->obd_type->typ_name,
1010                    LUSTRE_MDT_NAME) == 0) {
1011                 rc = req_check_sepol(tsi->tsi_pill);
1012                 if (rc)
1013                         GOTO(out, rc);
1014         }
1015
1016         RETURN(0);
1017 out:
1018         obd_disconnect(class_export_get(tsi->tsi_exp));
1019         return rc;
1020 }
1021 EXPORT_SYMBOL(tgt_connect);
1022
1023 int tgt_disconnect(struct tgt_session_info *tsi)
1024 {
1025         int rc;
1026
1027         ENTRY;
1028
1029         OBD_FAIL_TIMEOUT(OBD_FAIL_OST_DISCONNECT_DELAY, cfs_fail_val);
1030
1031         rc = target_handle_disconnect(tgt_ses_req(tsi));
1032         if (rc)
1033                 RETURN(err_serious(rc));
1034
1035         RETURN(rc);
1036 }
1037 EXPORT_SYMBOL(tgt_disconnect);
1038
1039 /*
1040  * Unified target OBD handlers
1041  */
1042 int tgt_obd_ping(struct tgt_session_info *tsi)
1043 {
1044         int rc;
1045
1046         ENTRY;
1047
1048         /* The target-specific part of OBD_PING request handling.
1049          * It controls Filter Modification Data (FMD) expiration each time
1050          * PING is received.
1051          *
1052          * Valid only for replayable targets, e.g. MDT and OFD
1053          */
1054         if (tsi->tsi_exp->exp_obd->obd_replayable)
1055                 tgt_fmd_expire(tsi->tsi_exp);
1056
1057         rc = req_capsule_server_pack(tsi->tsi_pill);
1058         if (rc)
1059                 RETURN(err_serious(rc));
1060
1061         RETURN(rc);
1062 }
1063 EXPORT_SYMBOL(tgt_obd_ping);
1064
1065 int tgt_obd_log_cancel(struct tgt_session_info *tsi)
1066 {
1067         return err_serious(-EOPNOTSUPP);
1068 }
1069
1070 int tgt_send_buffer(struct tgt_session_info *tsi, struct lu_rdbuf *rdbuf)
1071 {
1072         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1073         struct obd_export       *exp = req->rq_export;
1074         struct ptlrpc_bulk_desc *desc;
1075         int                      i;
1076         int                      rc;
1077         int                      pages = 0;
1078
1079         ENTRY;
1080
1081         for (i = 0; i < rdbuf->rb_nbufs; i++) {
1082                 unsigned int offset;
1083
1084                 offset = (unsigned long)rdbuf->rb_bufs[i].lb_buf & ~PAGE_MASK;
1085                 pages += DIV_ROUND_UP(rdbuf->rb_bufs[i].lb_len + offset,
1086                                       PAGE_SIZE);
1087         }
1088
1089         desc = ptlrpc_prep_bulk_exp(req, pages, 1,
1090                                   PTLRPC_BULK_PUT_SOURCE,
1091                                     MDS_BULK_PORTAL,
1092                                     &ptlrpc_bulk_kiov_nopin_ops);
1093         if (desc == NULL)
1094                 RETURN(-ENOMEM);
1095
1096         for (i = 0; i < rdbuf->rb_nbufs; i++)
1097                 desc->bd_frag_ops->add_iov_frag(desc,
1098                                         rdbuf->rb_bufs[i].lb_buf,
1099                                         rdbuf->rb_bufs[i].lb_len);
1100
1101         rc = target_bulk_io(exp, desc);
1102         ptlrpc_free_bulk(desc);
1103         RETURN(rc);
1104 }
1105 EXPORT_SYMBOL(tgt_send_buffer);
1106
1107 int tgt_sendpage(struct tgt_session_info *tsi, struct lu_rdpg *rdpg, int nob)
1108 {
1109         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1110         struct obd_export       *exp = req->rq_export;
1111         struct ptlrpc_bulk_desc *desc;
1112         int                      tmpcount;
1113         int                      tmpsize;
1114         int                      i;
1115         int                      rc;
1116
1117         ENTRY;
1118
1119         desc = ptlrpc_prep_bulk_exp(req, rdpg->rp_npages, 1,
1120                                     PTLRPC_BULK_PUT_SOURCE,
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_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_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);
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_SIZE - 1) >> PAGE_SHIFT;
1195
1196         /* allocate pages to store the containers */
1197         OBD_ALLOC_PTR_ARRAY(rdpg->rp_pages, rdpg->rp_npages);
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_NOFS);
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_PTR_ARRAY(rdpg->rp_pages, rdpg->rp_npages);
1225         }
1226         return rc;
1227 }
1228
1229 struct tgt_handler tgt_obd_handlers[] = {
1230 TGT_OBD_HDL    (0,      OBD_PING,               tgt_obd_ping),
1231 TGT_OBD_HDL    (0,      OBD_IDX_READ,           tgt_obd_idx_read)
1232 };
1233 EXPORT_SYMBOL(tgt_obd_handlers);
1234
1235 int tgt_sync(const struct lu_env *env, struct lu_target *tgt,
1236              struct dt_object *obj, __u64 start, __u64 end)
1237 {
1238         int rc = 0;
1239
1240         ENTRY;
1241
1242         /* if no objid is specified, it means "sync whole filesystem" */
1243         if (obj == NULL) {
1244                 rc = dt_sync(env, tgt->lut_bottom);
1245         } else if (dt_version_get(env, obj) >
1246                    tgt->lut_obd->obd_last_committed) {
1247                 rc = dt_object_sync(env, obj, start, end);
1248         }
1249         atomic_inc(&tgt->lut_sync_count);
1250
1251         RETURN(rc);
1252 }
1253 EXPORT_SYMBOL(tgt_sync);
1254 /*
1255  * Unified target DLM handlers.
1256  */
1257
1258 /**
1259  * Unified target BAST
1260  *
1261  * Ensure data and metadata are synced to disk when lock is canceled if Sync on
1262  * Cancel (SOC) is enabled. If it's extent lock, normally sync obj is enough,
1263  * but if it's cross-MDT lock, because remote object version is not set, a
1264  * filesystem sync is needed.
1265  *
1266  * \param lock server side lock
1267  * \param desc lock desc
1268  * \param data ldlm_cb_set_arg
1269  * \param flag  indicates whether this cancelling or blocking callback
1270  * \retval      0 on success
1271  * \retval      negative number on error
1272  */
1273 static int tgt_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
1274                             void *data, int flag)
1275 {
1276         struct lu_env            env;
1277         struct lu_target        *tgt;
1278         struct dt_object        *obj = NULL;
1279         struct lu_fid            fid;
1280         int                      rc = 0;
1281
1282         ENTRY;
1283
1284         tgt = class_exp2tgt(lock->l_export);
1285
1286         if (unlikely(tgt == NULL)) {
1287                 CDEBUG(D_ERROR, "%s: No target for connected export\n",
1288                        class_exp2obd(lock->l_export)->obd_name);
1289                 RETURN(-EINVAL);
1290         }
1291
1292         if (flag == LDLM_CB_CANCELING &&
1293             (lock->l_granted_mode & (LCK_EX | LCK_PW | LCK_GROUP)) &&
1294             (tgt->lut_sync_lock_cancel == SYNC_LOCK_CANCEL_ALWAYS ||
1295              (tgt->lut_sync_lock_cancel == SYNC_LOCK_CANCEL_BLOCKING &&
1296               ldlm_is_cbpending(lock))) &&
1297             ((exp_connect_flags(lock->l_export) & OBD_CONNECT_MDS_MDS) ||
1298              lock->l_resource->lr_type == LDLM_EXTENT)) {
1299                 __u64 start = 0;
1300                 __u64 end = OBD_OBJECT_EOF;
1301
1302                 rc = lu_env_init(&env, LCT_DT_THREAD);
1303                 if (unlikely(rc != 0))
1304                         GOTO(err, rc);
1305
1306                 ost_fid_from_resid(&fid, &lock->l_resource->lr_name,
1307                                    tgt->lut_lsd.lsd_osd_index);
1308
1309                 if (lock->l_resource->lr_type == LDLM_EXTENT) {
1310                         obj = dt_locate(&env, tgt->lut_bottom, &fid);
1311                         if (IS_ERR(obj))
1312                                 GOTO(err_env, rc = PTR_ERR(obj));
1313
1314                         if (!dt_object_exists(obj))
1315                                 GOTO(err_put, rc = -ENOENT);
1316
1317                         start = lock->l_policy_data.l_extent.start;
1318                         end = lock->l_policy_data.l_extent.end;
1319                 }
1320
1321                 rc = tgt_sync(&env, tgt, obj, start, end);
1322                 if (rc < 0) {
1323                         CERROR("%s: syncing "DFID" (%llu-%llu) on lock "
1324                                "cancel: rc = %d\n",
1325                                tgt_name(tgt), PFID(&fid),
1326                                lock->l_policy_data.l_extent.start,
1327                                lock->l_policy_data.l_extent.end, rc);
1328                 }
1329 err_put:
1330                 if (obj != NULL)
1331                         dt_object_put(&env, obj);
1332 err_env:
1333                 lu_env_fini(&env);
1334         }
1335 err:
1336         rc = ldlm_server_blocking_ast(lock, desc, data, flag);
1337         RETURN(rc);
1338 }
1339
1340 static struct ldlm_callback_suite tgt_dlm_cbs = {
1341         .lcs_completion = ldlm_server_completion_ast,
1342         .lcs_blocking   = tgt_blocking_ast,
1343         .lcs_glimpse    = ldlm_server_glimpse_ast
1344 };
1345
1346 int tgt_enqueue(struct tgt_session_info *tsi)
1347 {
1348         struct ptlrpc_request *req = tgt_ses_req(tsi);
1349         int rc;
1350
1351         ENTRY;
1352         /*
1353          * tsi->tsi_dlm_req was already swapped and (if necessary) converted,
1354          * tsi->tsi_dlm_cbs was set by the *_req_handle() function.
1355          */
1356         LASSERT(tsi->tsi_dlm_req != NULL);
1357         rc = ldlm_handle_enqueue0(tsi->tsi_exp->exp_obd->obd_namespace, req,
1358                                   tsi->tsi_dlm_req, &tgt_dlm_cbs);
1359         if (rc)
1360                 RETURN(err_serious(rc));
1361
1362         switch (LUT_FAIL_CLASS(tsi->tsi_reply_fail_id)) {
1363         case LUT_FAIL_MDT:
1364                 tsi->tsi_reply_fail_id = OBD_FAIL_MDS_LDLM_REPLY_NET;
1365                 break;
1366         case LUT_FAIL_OST:
1367                 tsi->tsi_reply_fail_id = OBD_FAIL_OST_LDLM_REPLY_NET;
1368                 break;
1369         case LUT_FAIL_MGT:
1370                 tsi->tsi_reply_fail_id = OBD_FAIL_MGS_LDLM_REPLY_NET;
1371                 break;
1372         default:
1373                 tsi->tsi_reply_fail_id = OBD_FAIL_LDLM_REPLY;
1374                 break;
1375         }
1376         RETURN(req->rq_status);
1377 }
1378 EXPORT_SYMBOL(tgt_enqueue);
1379
1380 int tgt_convert(struct tgt_session_info *tsi)
1381 {
1382         struct ptlrpc_request *req = tgt_ses_req(tsi);
1383         int rc;
1384
1385         ENTRY;
1386         LASSERT(tsi->tsi_dlm_req);
1387         rc = ldlm_handle_convert0(req, tsi->tsi_dlm_req);
1388         if (rc)
1389                 RETURN(err_serious(rc));
1390
1391         RETURN(req->rq_status);
1392 }
1393
1394 int tgt_bl_callback(struct tgt_session_info *tsi)
1395 {
1396         return err_serious(-EOPNOTSUPP);
1397 }
1398
1399 int tgt_cp_callback(struct tgt_session_info *tsi)
1400 {
1401         return err_serious(-EOPNOTSUPP);
1402 }
1403
1404 /* generic LDLM target handler */
1405 struct tgt_handler tgt_dlm_handlers[] = {
1406 TGT_DLM_HDL(HAS_KEY, LDLM_ENQUEUE, tgt_enqueue),
1407 TGT_DLM_HDL(HAS_KEY, LDLM_CONVERT, tgt_convert),
1408 TGT_DLM_HDL_VAR(0, LDLM_BL_CALLBACK, tgt_bl_callback),
1409 TGT_DLM_HDL_VAR(0, LDLM_CP_CALLBACK, tgt_cp_callback)
1410 };
1411 EXPORT_SYMBOL(tgt_dlm_handlers);
1412
1413 /*
1414  * Unified target LLOG handlers.
1415  */
1416 int tgt_llog_open(struct tgt_session_info *tsi)
1417 {
1418         int rc;
1419
1420         ENTRY;
1421
1422         rc = llog_origin_handle_open(tgt_ses_req(tsi));
1423
1424         RETURN(rc);
1425 }
1426 EXPORT_SYMBOL(tgt_llog_open);
1427
1428 int tgt_llog_read_header(struct tgt_session_info *tsi)
1429 {
1430         int rc;
1431
1432         ENTRY;
1433
1434         rc = llog_origin_handle_read_header(tgt_ses_req(tsi));
1435
1436         RETURN(rc);
1437 }
1438 EXPORT_SYMBOL(tgt_llog_read_header);
1439
1440 int tgt_llog_next_block(struct tgt_session_info *tsi)
1441 {
1442         int rc;
1443
1444         ENTRY;
1445
1446         rc = llog_origin_handle_next_block(tgt_ses_req(tsi));
1447
1448         RETURN(rc);
1449 }
1450 EXPORT_SYMBOL(tgt_llog_next_block);
1451
1452 int tgt_llog_prev_block(struct tgt_session_info *tsi)
1453 {
1454         int rc;
1455
1456         ENTRY;
1457
1458         rc = llog_origin_handle_prev_block(tgt_ses_req(tsi));
1459
1460         RETURN(rc);
1461 }
1462 EXPORT_SYMBOL(tgt_llog_prev_block);
1463
1464 /* generic llog target handler */
1465 struct tgt_handler tgt_llog_handlers[] = {
1466 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_CREATE,      tgt_llog_open),
1467 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_NEXT_BLOCK,  tgt_llog_next_block),
1468 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_READ_HEADER, tgt_llog_read_header),
1469 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_PREV_BLOCK,  tgt_llog_prev_block),
1470 };
1471 EXPORT_SYMBOL(tgt_llog_handlers);
1472
1473 /*
1474  * sec context handlers
1475  */
1476 /* XXX: Implement based on mdt_sec_ctx_handle()? */
1477 static int tgt_sec_ctx_handle(struct tgt_session_info *tsi)
1478 {
1479         return 0;
1480 }
1481
1482 struct tgt_handler tgt_sec_ctx_handlers[] = {
1483 TGT_SEC_HDL_VAR(0,      SEC_CTX_INIT,           tgt_sec_ctx_handle),
1484 TGT_SEC_HDL_VAR(0,      SEC_CTX_INIT_CONT,      tgt_sec_ctx_handle),
1485 TGT_SEC_HDL_VAR(0,      SEC_CTX_FINI,           tgt_sec_ctx_handle),
1486 };
1487 EXPORT_SYMBOL(tgt_sec_ctx_handlers);
1488
1489 int (*tgt_lfsck_in_notify_local)(const struct lu_env *env,
1490                                  struct dt_device *key,
1491                                  struct lfsck_req_local *lrl,
1492                                  struct thandle *th) = NULL;
1493
1494 void tgt_register_lfsck_in_notify_local(int (*notify)(const struct lu_env *,
1495                                                       struct dt_device *,
1496                                                       struct lfsck_req_local *,
1497                                                       struct thandle *))
1498 {
1499         tgt_lfsck_in_notify_local = notify;
1500 }
1501 EXPORT_SYMBOL(tgt_register_lfsck_in_notify_local);
1502
1503 int (*tgt_lfsck_in_notify)(const struct lu_env *env,
1504                            struct dt_device *key,
1505                            struct lfsck_request *lr) = NULL;
1506
1507 void tgt_register_lfsck_in_notify(int (*notify)(const struct lu_env *,
1508                                                 struct dt_device *,
1509                                                 struct lfsck_request *))
1510 {
1511         tgt_lfsck_in_notify = notify;
1512 }
1513 EXPORT_SYMBOL(tgt_register_lfsck_in_notify);
1514
1515 static int (*tgt_lfsck_query)(const struct lu_env *env,
1516                               struct dt_device *key,
1517                               struct lfsck_request *req,
1518                               struct lfsck_reply *rep,
1519                               struct lfsck_query *que) = NULL;
1520
1521 void tgt_register_lfsck_query(int (*query)(const struct lu_env *,
1522                                            struct dt_device *,
1523                                            struct lfsck_request *,
1524                                            struct lfsck_reply *,
1525                                            struct lfsck_query *))
1526 {
1527         tgt_lfsck_query = query;
1528 }
1529 EXPORT_SYMBOL(tgt_register_lfsck_query);
1530
1531 /* LFSCK request handlers */
1532 static int tgt_handle_lfsck_notify(struct tgt_session_info *tsi)
1533 {
1534         const struct lu_env     *env = tsi->tsi_env;
1535         struct dt_device        *key = tsi->tsi_tgt->lut_bottom;
1536         struct lfsck_request    *lr;
1537         int                      rc;
1538         ENTRY;
1539
1540         lr = req_capsule_client_get(tsi->tsi_pill, &RMF_LFSCK_REQUEST);
1541         if (lr == NULL)
1542                 RETURN(-EPROTO);
1543
1544         rc = tgt_lfsck_in_notify(env, key, lr);
1545
1546         RETURN(rc);
1547 }
1548
1549 static int tgt_handle_lfsck_query(struct tgt_session_info *tsi)
1550 {
1551         struct lfsck_request    *request;
1552         struct lfsck_reply      *reply;
1553         int                      rc;
1554         ENTRY;
1555
1556         request = req_capsule_client_get(tsi->tsi_pill, &RMF_LFSCK_REQUEST);
1557         if (request == NULL)
1558                 RETURN(-EPROTO);
1559
1560         reply = req_capsule_server_get(tsi->tsi_pill, &RMF_LFSCK_REPLY);
1561         if (reply == NULL)
1562                 RETURN(-ENOMEM);
1563
1564         rc = tgt_lfsck_query(tsi->tsi_env, tsi->tsi_tgt->lut_bottom,
1565                              request, reply, NULL);
1566
1567         RETURN(rc < 0 ? rc : 0);
1568 }
1569
1570 struct tgt_handler tgt_lfsck_handlers[] = {
1571 TGT_LFSCK_HDL(HAS_REPLY,        LFSCK_NOTIFY,   tgt_handle_lfsck_notify),
1572 TGT_LFSCK_HDL(HAS_REPLY,        LFSCK_QUERY,    tgt_handle_lfsck_query),
1573 };
1574 EXPORT_SYMBOL(tgt_lfsck_handlers);
1575
1576 /*
1577  * initialize per-thread page pool (bug 5137).
1578  */
1579 int tgt_io_thread_init(struct ptlrpc_thread *thread)
1580 {
1581         struct tgt_thread_big_cache *tbc;
1582
1583         ENTRY;
1584
1585         LASSERT(thread != NULL);
1586         LASSERT(thread->t_data == NULL);
1587
1588         OBD_ALLOC_LARGE(tbc, sizeof(*tbc));
1589         if (tbc == NULL)
1590                 RETURN(-ENOMEM);
1591         thread->t_data = tbc;
1592         RETURN(0);
1593 }
1594 EXPORT_SYMBOL(tgt_io_thread_init);
1595
1596 /*
1597  * free per-thread pool created by tgt_thread_init().
1598  */
1599 void tgt_io_thread_done(struct ptlrpc_thread *thread)
1600 {
1601         struct tgt_thread_big_cache *tbc;
1602
1603         ENTRY;
1604
1605         LASSERT(thread != NULL);
1606
1607         /*
1608          * be prepared to handle partially-initialized pools (because this is
1609          * called from ost_io_thread_init() for cleanup.
1610          */
1611         tbc = thread->t_data;
1612         if (tbc != NULL) {
1613                 OBD_FREE_LARGE(tbc, sizeof(*tbc));
1614                 thread->t_data = NULL;
1615         }
1616         EXIT;
1617 }
1618 EXPORT_SYMBOL(tgt_io_thread_done);
1619
1620 /**
1621  * Helper function for getting Data-on-MDT file server DLM lock
1622  * if asked by client.
1623  */
1624 int tgt_mdt_data_lock(struct ldlm_namespace *ns, struct ldlm_res_id *res_id,
1625                       struct lustre_handle *lh, int mode, __u64 *flags)
1626 {
1627         union ldlm_policy_data policy = {
1628                 .l_inodebits.bits = MDS_INODELOCK_DOM,
1629         };
1630         int rc;
1631
1632         ENTRY;
1633
1634         LASSERT(lh != NULL);
1635         LASSERT(ns != NULL);
1636         LASSERT(!lustre_handle_is_used(lh));
1637
1638         rc = ldlm_cli_enqueue_local(NULL, ns, res_id, LDLM_IBITS, &policy, mode,
1639                                     flags, ldlm_blocking_ast,
1640                                     ldlm_completion_ast, ldlm_glimpse_ast,
1641                                     NULL, 0, LVB_T_NONE, NULL, lh);
1642
1643         RETURN(rc == ELDLM_OK ? 0 : -EIO);
1644 }
1645 EXPORT_SYMBOL(tgt_mdt_data_lock);
1646
1647 void tgt_mdt_data_unlock(struct lustre_handle *lh, enum ldlm_mode mode)
1648 {
1649         LASSERT(lustre_handle_is_used(lh));
1650         ldlm_lock_decref(lh, mode);
1651 }
1652 EXPORT_SYMBOL(tgt_mdt_data_unlock);
1653
1654 /**
1655  * Helper function for getting server side [start, start+count] DLM lock
1656  * if asked by client.
1657  */
1658 int tgt_extent_lock(const struct lu_env *env, struct ldlm_namespace *ns,
1659                     struct ldlm_res_id *res_id, __u64 start, __u64 end,
1660                     struct lustre_handle *lh, int mode, __u64 *flags)
1661 {
1662         union ldlm_policy_data policy;
1663         int rc;
1664
1665         ENTRY;
1666
1667         LASSERT(lh != NULL);
1668         LASSERT(ns != NULL);
1669         LASSERT(!lustre_handle_is_used(lh));
1670
1671         policy.l_extent.gid = 0;
1672         policy.l_extent.start = start & PAGE_MASK;
1673
1674         /*
1675          * If ->o_blocks is EOF it means "lock till the end of the file".
1676          * Otherwise, it's size of an extent or hole being punched (in bytes).
1677          */
1678         if (end == OBD_OBJECT_EOF || end < start)
1679                 policy.l_extent.end = OBD_OBJECT_EOF;
1680         else
1681                 policy.l_extent.end = end | ~PAGE_MASK;
1682
1683         rc = ldlm_cli_enqueue_local(env, ns, res_id, LDLM_EXTENT, &policy,
1684                                     mode, flags, ldlm_blocking_ast,
1685                                     ldlm_completion_ast, ldlm_glimpse_ast,
1686                                     NULL, 0, LVB_T_NONE, NULL, lh);
1687         RETURN(rc == ELDLM_OK ? 0 : -EIO);
1688 }
1689 EXPORT_SYMBOL(tgt_extent_lock);
1690
1691 void tgt_extent_unlock(struct lustre_handle *lh, enum ldlm_mode mode)
1692 {
1693         LASSERT(lustre_handle_is_used(lh));
1694         ldlm_lock_decref(lh, mode);
1695 }
1696 EXPORT_SYMBOL(tgt_extent_unlock);
1697
1698 static int tgt_brw_lock(const struct lu_env *env, struct obd_export *exp,
1699                         struct ldlm_res_id *res_id, struct obd_ioobj *obj,
1700                         struct niobuf_remote *nb, struct lustre_handle *lh,
1701                         enum ldlm_mode mode)
1702 {
1703         struct ldlm_namespace   *ns = exp->exp_obd->obd_namespace;
1704         __u64                    flags = 0;
1705         int                      nrbufs = obj->ioo_bufcnt;
1706         int                      i;
1707         int                      rc;
1708
1709         ENTRY;
1710
1711         LASSERT(mode == LCK_PR || mode == LCK_PW);
1712         LASSERT(!lustre_handle_is_used(lh));
1713
1714         if (ns->ns_obd->obd_recovering)
1715                 RETURN(0);
1716
1717         if (nrbufs == 0 || !(nb[0].rnb_flags & OBD_BRW_SRVLOCK))
1718                 RETURN(0);
1719
1720         for (i = 1; i < nrbufs; i++)
1721                 if (!(nb[i].rnb_flags & OBD_BRW_SRVLOCK))
1722                         RETURN(-EFAULT);
1723
1724         /* MDT IO for data-on-mdt */
1725         if (exp->exp_connect_data.ocd_connect_flags & OBD_CONNECT_IBITS)
1726                 rc = tgt_mdt_data_lock(ns, res_id, lh, mode, &flags);
1727         else
1728                 rc = tgt_extent_lock(env, ns, res_id, nb[0].rnb_offset,
1729                                      nb[nrbufs - 1].rnb_offset +
1730                                      nb[nrbufs - 1].rnb_len - 1,
1731                                      lh, mode, &flags);
1732         RETURN(rc);
1733 }
1734
1735 static void tgt_brw_unlock(struct obd_ioobj *obj, struct niobuf_remote *niob,
1736                            struct lustre_handle *lh, enum ldlm_mode mode)
1737 {
1738         ENTRY;
1739
1740         LASSERT(mode == LCK_PR || mode == LCK_PW);
1741         LASSERT((obj->ioo_bufcnt > 0 &&
1742                  (niob[0].rnb_flags & OBD_BRW_SRVLOCK)) ==
1743                 lustre_handle_is_used(lh));
1744
1745         if (lustre_handle_is_used(lh))
1746                 tgt_extent_unlock(lh, mode);
1747         EXIT;
1748 }
1749 static int tgt_checksum_niobuf(struct lu_target *tgt,
1750                                  struct niobuf_local *local_nb, int npages,
1751                                  int opc, enum cksum_types cksum_type,
1752                                  __u32 *cksum)
1753 {
1754         struct ahash_request           *req;
1755         unsigned int                    bufsize;
1756         int                             i, err;
1757         unsigned char                   cfs_alg = cksum_obd2cfs(cksum_type);
1758
1759         req = cfs_crypto_hash_init(cfs_alg, NULL, 0);
1760         if (IS_ERR(req)) {
1761                 CERROR("%s: unable to initialize checksum hash %s\n",
1762                        tgt_name(tgt), cfs_crypto_hash_name(cfs_alg));
1763                 return PTR_ERR(req);
1764         }
1765
1766         CDEBUG(D_INFO, "Checksum for algo %s\n", cfs_crypto_hash_name(cfs_alg));
1767         for (i = 0; i < npages; i++) {
1768                 /* corrupt the data before we compute the checksum, to
1769                  * simulate a client->OST data error */
1770                 if (i == 0 && opc == OST_WRITE &&
1771                     OBD_FAIL_CHECK(OBD_FAIL_OST_CHECKSUM_RECEIVE)) {
1772                         int off = local_nb[i].lnb_page_offset & ~PAGE_MASK;
1773                         int len = local_nb[i].lnb_len;
1774                         struct page *np = tgt_page_to_corrupt;
1775
1776                         if (np) {
1777                                 char *ptr = kmap_atomic(local_nb[i].lnb_page);
1778                                 char *ptr2 = page_address(np);
1779
1780                                 memcpy(ptr2 + off, ptr + off, len);
1781                                 memcpy(ptr2 + off, "bad3", min(4, len));
1782                                 kunmap_atomic(ptr);
1783
1784                                 /* LU-8376 to preserve original index for
1785                                  * display in dump_all_bulk_pages() */
1786                                 np->index = i;
1787
1788                                 cfs_crypto_hash_update_page(req, np, off,
1789                                                             len);
1790                                 continue;
1791                         } else {
1792                                 CERROR("%s: can't alloc page for corruption\n",
1793                                        tgt_name(tgt));
1794                         }
1795                 }
1796                 cfs_crypto_hash_update_page(req, local_nb[i].lnb_page,
1797                                   local_nb[i].lnb_page_offset & ~PAGE_MASK,
1798                                   local_nb[i].lnb_len);
1799
1800                  /* corrupt the data after we compute the checksum, to
1801                  * simulate an OST->client data error */
1802                 if (i == 0 && opc == OST_READ &&
1803                     OBD_FAIL_CHECK(OBD_FAIL_OST_CHECKSUM_SEND)) {
1804                         int off = local_nb[i].lnb_page_offset & ~PAGE_MASK;
1805                         int len = local_nb[i].lnb_len;
1806                         struct page *np = tgt_page_to_corrupt;
1807
1808                         if (np) {
1809                                 char *ptr = kmap_atomic(local_nb[i].lnb_page);
1810                                 char *ptr2 = page_address(np);
1811
1812                                 memcpy(ptr2 + off, ptr + off, len);
1813                                 memcpy(ptr2 + off, "bad4", min(4, len));
1814                                 kunmap_atomic(ptr);
1815
1816                                 /* LU-8376 to preserve original index for
1817                                  * display in dump_all_bulk_pages() */
1818                                 np->index = i;
1819
1820                                 cfs_crypto_hash_update_page(req, np, off,
1821                                                             len);
1822                                 continue;
1823                         } else {
1824                                 CERROR("%s: can't alloc page for corruption\n",
1825                                        tgt_name(tgt));
1826                         }
1827                 }
1828         }
1829
1830         bufsize = sizeof(*cksum);
1831         err = cfs_crypto_hash_final(req, (unsigned char *)cksum, &bufsize);
1832
1833         return 0;
1834 }
1835
1836 char dbgcksum_file_name[PATH_MAX];
1837
1838 static void dump_all_bulk_pages(struct obdo *oa, int count,
1839                                 struct niobuf_local *local_nb,
1840                                 __u32 server_cksum, __u32 client_cksum)
1841 {
1842         struct file *filp;
1843         int rc, i;
1844         unsigned int len;
1845         char *buf;
1846
1847         /* will only keep dump of pages on first error for the same range in
1848          * file/fid, not during the resends/retries. */
1849         snprintf(dbgcksum_file_name, sizeof(dbgcksum_file_name),
1850                  "%s-checksum_dump-ost-"DFID":[%llu-%llu]-%x-%x",
1851                  (strncmp(libcfs_debug_file_path_arr, "NONE", 4) != 0 ?
1852                   libcfs_debug_file_path_arr :
1853                   LIBCFS_DEBUG_FILE_PATH_DEFAULT),
1854                  oa->o_valid & OBD_MD_FLFID ? oa->o_parent_seq : (__u64)0,
1855                  oa->o_valid & OBD_MD_FLFID ? oa->o_parent_oid : 0,
1856                  oa->o_valid & OBD_MD_FLFID ? oa->o_parent_ver : 0,
1857                  local_nb[0].lnb_file_offset,
1858                  local_nb[count-1].lnb_file_offset +
1859                  local_nb[count-1].lnb_len - 1, client_cksum, server_cksum);
1860         filp = filp_open(dbgcksum_file_name,
1861                          O_CREAT | O_EXCL | O_WRONLY | O_LARGEFILE, 0600);
1862         if (IS_ERR(filp)) {
1863                 rc = PTR_ERR(filp);
1864                 if (rc == -EEXIST)
1865                         CDEBUG(D_INFO, "%s: can't open to dump pages with "
1866                                "checksum error: rc = %d\n", dbgcksum_file_name,
1867                                rc);
1868                 else
1869                         CERROR("%s: can't open to dump pages with checksum "
1870                                "error: rc = %d\n", dbgcksum_file_name, rc);
1871                 return;
1872         }
1873
1874         for (i = 0; i < count; i++) {
1875                 len = local_nb[i].lnb_len;
1876                 buf = kmap(local_nb[i].lnb_page);
1877                 while (len != 0) {
1878                         rc = cfs_kernel_write(filp, buf, len, &filp->f_pos);
1879                         if (rc < 0) {
1880                                 CERROR("%s: wanted to write %u but got %d "
1881                                        "error\n", dbgcksum_file_name, len, rc);
1882                                 break;
1883                         }
1884                         len -= rc;
1885                         buf += rc;
1886                         CDEBUG(D_INFO, "%s: wrote %d bytes\n",
1887                                dbgcksum_file_name, rc);
1888                 }
1889                 kunmap(local_nb[i].lnb_page);
1890         }
1891
1892         rc = vfs_fsync_range(filp, 0, LLONG_MAX, 1);
1893         if (rc)
1894                 CERROR("%s: sync returns %d\n", dbgcksum_file_name, rc);
1895         filp_close(filp, NULL);
1896 }
1897
1898 static int check_read_checksum(struct niobuf_local *local_nb, int npages,
1899                                struct obd_export *exp, struct obdo *oa,
1900                                const struct lnet_process_id *peer,
1901                                __u32 client_cksum, __u32 server_cksum,
1902                                enum cksum_types server_cksum_type)
1903 {
1904         char *msg;
1905         enum cksum_types cksum_type;
1906         loff_t start, end;
1907
1908         /* unlikely to happen and only if resend does not occur due to cksum
1909          * control failure on Client */
1910         if (unlikely(server_cksum == client_cksum)) {
1911                 CDEBUG(D_PAGE, "checksum %x confirmed upon retry\n",
1912                        client_cksum);
1913                 return 0;
1914         }
1915
1916         if (exp->exp_obd->obd_checksum_dump)
1917                 dump_all_bulk_pages(oa, npages, local_nb, server_cksum,
1918                                     client_cksum);
1919
1920         cksum_type = obd_cksum_type_unpack(oa->o_valid & OBD_MD_FLFLAGS ?
1921                                            oa->o_flags : 0);
1922
1923         if (cksum_type != server_cksum_type)
1924                 msg = "the server may have not used the checksum type specified"
1925                       " in the original request - likely a protocol problem";
1926         else
1927                 msg = "should have changed on the client or in transit";
1928
1929         start = local_nb[0].lnb_file_offset;
1930         end = local_nb[npages-1].lnb_file_offset +
1931                                         local_nb[npages-1].lnb_len - 1;
1932
1933         LCONSOLE_ERROR_MSG(0x132, "%s: BAD READ CHECKSUM: %s: from %s inode "
1934                 DFID " object "DOSTID" extent [%llu-%llu], client returned csum"
1935                 " %x (type %x), server csum %x (type %x)\n",
1936                 exp->exp_obd->obd_name,
1937                 msg, libcfs_nid2str(peer->nid),
1938                 oa->o_valid & OBD_MD_FLFID ? oa->o_parent_seq : 0ULL,
1939                 oa->o_valid & OBD_MD_FLFID ? oa->o_parent_oid : 0,
1940                 oa->o_valid & OBD_MD_FLFID ? oa->o_parent_ver : 0,
1941                 POSTID(&oa->o_oi),
1942                 start, end, client_cksum, cksum_type, server_cksum,
1943                 server_cksum_type);
1944
1945         return 1;
1946 }
1947
1948 static int tgt_pages2shortio(struct niobuf_local *local, int npages,
1949                              unsigned char *buf, int size)
1950 {
1951         int     i, off, len, copied = size;
1952         char    *ptr;
1953
1954         for (i = 0; i < npages; i++) {
1955                 off = local[i].lnb_page_offset & ~PAGE_MASK;
1956                 len = local[i].lnb_len;
1957
1958                 CDEBUG(D_PAGE, "index %d offset = %d len = %d left = %d\n",
1959                        i, off, len, size);
1960                 if (len > size)
1961                         return -EINVAL;
1962
1963                 ptr = kmap_atomic(local[i].lnb_page);
1964                 memcpy(buf + off, ptr, len);
1965                 kunmap_atomic(ptr);
1966                 buf += len;
1967                 size -= len;
1968         }
1969         return copied - size;
1970 }
1971
1972 static int tgt_checksum_niobuf_t10pi(struct lu_target *tgt,
1973                                      struct niobuf_local *local_nb,
1974                                      int npages, int opc,
1975                                      obd_dif_csum_fn *fn,
1976                                      int sector_size,
1977                                      u32 *check_sum)
1978 {
1979         enum cksum_types t10_cksum_type = tgt->lut_dt_conf.ddp_t10_cksum_type;
1980         unsigned char cfs_alg = cksum_obd2cfs(OBD_CKSUM_T10_TOP);
1981         const char *obd_name = tgt->lut_obd->obd_name;
1982         struct ahash_request *req;
1983         unsigned int bufsize;
1984         unsigned char *buffer;
1985         struct page *__page;
1986         __u16 *guard_start;
1987         int guard_number;
1988         int used_number = 0;
1989         __u32 cksum;
1990         int rc = 0;
1991         int used;
1992         int i;
1993
1994         __page = alloc_page(GFP_KERNEL);
1995         if (__page == NULL)
1996                 return -ENOMEM;
1997
1998         req = cfs_crypto_hash_init(cfs_alg, NULL, 0);
1999         if (IS_ERR(req)) {
2000                 CERROR("%s: unable to initialize checksum hash %s\n",
2001                        tgt_name(tgt), cfs_crypto_hash_name(cfs_alg));
2002                 return PTR_ERR(req);
2003         }
2004
2005         buffer = kmap(__page);
2006         guard_start = (__u16 *)buffer;
2007         guard_number = PAGE_SIZE / sizeof(*guard_start);
2008         for (i = 0; i < npages; i++) {
2009                 /* corrupt the data before we compute the checksum, to
2010                  * simulate a client->OST data error */
2011                 if (i == 0 && opc == OST_WRITE &&
2012                     OBD_FAIL_CHECK(OBD_FAIL_OST_CHECKSUM_RECEIVE)) {
2013                         int off = local_nb[i].lnb_page_offset & ~PAGE_MASK;
2014                         int len = local_nb[i].lnb_len;
2015                         struct page *np = tgt_page_to_corrupt;
2016
2017                         if (np) {
2018                                 char *ptr = kmap_atomic(local_nb[i].lnb_page);
2019                                 char *ptr2 = page_address(np);
2020
2021                                 memcpy(ptr2 + off, ptr + off, len);
2022                                 memcpy(ptr2 + off, "bad3", min(4, len));
2023                                 kunmap_atomic(ptr);
2024
2025                                 /* LU-8376 to preserve original index for
2026                                  * display in dump_all_bulk_pages() */
2027                                 np->index = i;
2028
2029                                 cfs_crypto_hash_update_page(req, np, off,
2030                                                             len);
2031                                 continue;
2032                         } else {
2033                                 CERROR("%s: can't alloc page for corruption\n",
2034                                        tgt_name(tgt));
2035                         }
2036                 }
2037
2038                 /*
2039                  * The left guard number should be able to hold checksums of a
2040                  * whole page
2041                  */
2042                 if (t10_cksum_type && opc == OST_READ &&
2043                     local_nb[i].lnb_guard_disk) {
2044                         used = DIV_ROUND_UP(local_nb[i].lnb_len, sector_size);
2045                         if (used > (guard_number - used_number)) {
2046                                 rc = -E2BIG;
2047                                 break;
2048                         }
2049                         memcpy(guard_start + used_number,
2050                                local_nb[i].lnb_guards,
2051                                used * sizeof(*local_nb[i].lnb_guards));
2052                 } else {
2053                         rc = obd_page_dif_generate_buffer(obd_name,
2054                                 local_nb[i].lnb_page,
2055                                 local_nb[i].lnb_page_offset & ~PAGE_MASK,
2056                                 local_nb[i].lnb_len, guard_start + used_number,
2057                                 guard_number - used_number, &used, sector_size,
2058                                 fn);
2059                         if (rc)
2060                                 break;
2061                 }
2062
2063                 LASSERT(used <= MAX_GUARD_NUMBER);
2064                 /*
2065                  * If disk support T10PI checksum, copy guards to local_nb.
2066                  * If the write is partial page, do not use the guards for bio
2067                  * submission since the data might not be full-sector. The bio
2068                  * guards will be generated later based on the full sectors. If
2069                  * the sector size is 512B rather than 4 KB, or the page size
2070                  * is larger than 4KB, this might drop some useful guards for
2071                  * partial page write, but it will only add minimal extra time
2072                  * of checksum calculation.
2073                  */
2074                 if (t10_cksum_type && opc == OST_WRITE &&
2075                     local_nb[i].lnb_len == PAGE_SIZE) {
2076                         local_nb[i].lnb_guard_rpc = 1;
2077                         memcpy(local_nb[i].lnb_guards,
2078                                guard_start + used_number,
2079                                used * sizeof(*local_nb[i].lnb_guards));
2080                 }
2081
2082                 used_number += used;
2083                 if (used_number == guard_number) {
2084                         cfs_crypto_hash_update_page(req, __page, 0,
2085                                 used_number * sizeof(*guard_start));
2086                         used_number = 0;
2087                 }
2088
2089                  /* corrupt the data after we compute the checksum, to
2090                  * simulate an OST->client data error */
2091                 if (unlikely(i == 0 && opc == OST_READ &&
2092                              OBD_FAIL_CHECK(OBD_FAIL_OST_CHECKSUM_SEND))) {
2093                         int off = local_nb[i].lnb_page_offset & ~PAGE_MASK;
2094                         int len = local_nb[i].lnb_len;
2095                         struct page *np = tgt_page_to_corrupt;
2096
2097                         if (np) {
2098                                 char *ptr = kmap_atomic(local_nb[i].lnb_page);
2099                                 char *ptr2 = page_address(np);
2100
2101                                 memcpy(ptr2 + off, ptr + off, len);
2102                                 memcpy(ptr2 + off, "bad4", min(4, len));
2103                                 kunmap_atomic(ptr);
2104
2105                                 /* LU-8376 to preserve original index for
2106                                  * display in dump_all_bulk_pages() */
2107                                 np->index = i;
2108
2109                                 cfs_crypto_hash_update_page(req, np, off,
2110                                                             len);
2111                                 continue;
2112                         } else {
2113                                 CERROR("%s: can't alloc page for corruption\n",
2114                                        tgt_name(tgt));
2115                         }
2116                 }
2117         }
2118         kunmap(__page);
2119         if (rc)
2120                 GOTO(out, rc);
2121
2122         if (used_number != 0)
2123                 cfs_crypto_hash_update_page(req, __page, 0,
2124                         used_number * sizeof(*guard_start));
2125
2126         bufsize = sizeof(cksum);
2127         rc = cfs_crypto_hash_final(req, (unsigned char *)&cksum, &bufsize);
2128
2129         if (rc == 0)
2130                 *check_sum = cksum;
2131 out:
2132         __free_page(__page);
2133         return rc;
2134 }
2135
2136 static int tgt_checksum_niobuf_rw(struct lu_target *tgt,
2137                                   enum cksum_types cksum_type,
2138                                   struct niobuf_local *local_nb,
2139                                   int npages, int opc, u32 *check_sum)
2140 {
2141         obd_dif_csum_fn *fn = NULL;
2142         int sector_size = 0;
2143         int rc;
2144
2145         ENTRY;
2146         obd_t10_cksum2dif(cksum_type, &fn, &sector_size);
2147
2148         if (fn)
2149                 rc = tgt_checksum_niobuf_t10pi(tgt, local_nb, npages,
2150                                                opc, fn, sector_size,
2151                                                check_sum);
2152         else
2153                 rc = tgt_checksum_niobuf(tgt, local_nb, npages, opc,
2154                                          cksum_type, check_sum);
2155         RETURN(rc);
2156 }
2157
2158 int tgt_brw_read(struct tgt_session_info *tsi)
2159 {
2160         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2161         struct ptlrpc_bulk_desc *desc = NULL;
2162         struct obd_export       *exp = tsi->tsi_exp;
2163         struct niobuf_remote    *remote_nb;
2164         struct niobuf_local     *local_nb;
2165         struct obd_ioobj        *ioo;
2166         struct ost_body         *body, *repbody;
2167         struct lustre_handle     lockh = { 0 };
2168         int                      npages, nob = 0, rc, i, no_reply = 0,
2169                                  npages_read;
2170         struct tgt_thread_big_cache *tbc = req->rq_svc_thread->t_data;
2171         const char *obd_name = exp->exp_obd->obd_name;
2172
2173         ENTRY;
2174
2175         if (ptlrpc_req2svc(req)->srv_req_portal != OST_IO_PORTAL &&
2176             ptlrpc_req2svc(req)->srv_req_portal != MDS_IO_PORTAL) {
2177                 CERROR("%s: deny read request from %s to portal %u\n",
2178                        tgt_name(tsi->tsi_tgt),
2179                        obd_export_nid2str(req->rq_export),
2180                        ptlrpc_req2svc(req)->srv_req_portal);
2181                 RETURN(-EPROTO);
2182         }
2183
2184         req->rq_bulk_read = 1;
2185
2186         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_READ_BULK))
2187                 RETURN(-EIO);
2188
2189         OBD_FAIL_TIMEOUT(OBD_FAIL_OST_BRW_PAUSE_BULK, cfs_fail_val > 0 ?
2190                          cfs_fail_val : (obd_timeout + 1) / 4);
2191
2192         /* Check if there is eviction in progress, and if so, wait for it to
2193          * finish */
2194         if (unlikely(atomic_read(&exp->exp_obd->obd_evict_inprogress))) {
2195                 /* We do not care how long it takes */
2196                 wait_event_idle(
2197                         exp->exp_obd->obd_evict_inprogress_waitq,
2198                         !atomic_read(&exp->exp_obd->obd_evict_inprogress));
2199         }
2200
2201         /* There must be big cache in current thread to process this request
2202          * if it is NULL then something went wrong and it wasn't allocated,
2203          * report -ENOMEM in that case */
2204         if (tbc == NULL)
2205                 RETURN(-ENOMEM);
2206
2207         body = tsi->tsi_ost_body;
2208         LASSERT(body != NULL);
2209
2210         ioo = req_capsule_client_get(tsi->tsi_pill, &RMF_OBD_IOOBJ);
2211         LASSERT(ioo != NULL); /* must exists after tgt_ost_body_unpack */
2212
2213         remote_nb = req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE);
2214         LASSERT(remote_nb != NULL); /* must exists after tgt_ost_body_unpack */
2215
2216         local_nb = tbc->local;
2217
2218         rc = tgt_brw_lock(tsi->tsi_env, exp, &tsi->tsi_resid, ioo, remote_nb,
2219                           &lockh, LCK_PR);
2220         if (rc != 0)
2221                 RETURN(rc);
2222
2223         /*
2224          * If getting the lock took more time than
2225          * client was willing to wait, drop it. b=11330
2226          */
2227         if (ktime_get_real_seconds() > req->rq_deadline ||
2228             OBD_FAIL_CHECK(OBD_FAIL_OST_DROP_REQ)) {
2229                 no_reply = 1;
2230                 CERROR("Dropping timed-out read from %s because locking object " DOSTID " took %lld seconds (limit was %lld).\n",
2231                        libcfs_id2str(req->rq_peer), POSTID(&ioo->ioo_oid),
2232                        ktime_get_real_seconds() - req->rq_arrival_time.tv_sec,
2233                        req->rq_deadline - req->rq_arrival_time.tv_sec);
2234                 GOTO(out_lock, rc = -ETIMEDOUT);
2235         }
2236
2237         repbody = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
2238         repbody->oa = body->oa;
2239
2240         npages = PTLRPC_MAX_BRW_PAGES;
2241         rc = obd_preprw(tsi->tsi_env, OBD_BRW_READ, exp, &repbody->oa, 1,
2242                         ioo, remote_nb, &npages, local_nb);
2243         if (rc != 0)
2244                 GOTO(out_lock, rc);
2245
2246         if (body->oa.o_valid & OBD_MD_FLFLAGS &&
2247             body->oa.o_flags & OBD_FL_SHORT_IO) {
2248                 desc = NULL;
2249         } else {
2250                 desc = ptlrpc_prep_bulk_exp(req, npages, ioobj_max_brw_get(ioo),
2251                                             PTLRPC_BULK_PUT_SOURCE,
2252                                             OST_BULK_PORTAL,
2253                                             &ptlrpc_bulk_kiov_nopin_ops);
2254                 if (desc == NULL)
2255                         GOTO(out_commitrw, rc = -ENOMEM);
2256         }
2257
2258         nob = 0;
2259         npages_read = npages;
2260         for (i = 0; i < npages; i++) {
2261                 int page_rc = local_nb[i].lnb_rc;
2262
2263                 if (page_rc < 0) {
2264                         rc = page_rc;
2265                         npages_read = i;
2266                         break;
2267                 }
2268
2269                 nob += page_rc;
2270                 if (page_rc != 0 && desc != NULL) { /* some data! */
2271                         LASSERT(local_nb[i].lnb_page != NULL);
2272                         desc->bd_frag_ops->add_kiov_frag
2273                           (desc, local_nb[i].lnb_page,
2274                            local_nb[i].lnb_page_offset & ~PAGE_MASK,
2275                            page_rc);
2276                 }
2277
2278                 if (page_rc != local_nb[i].lnb_len) { /* short read */
2279                         local_nb[i].lnb_len = page_rc;
2280                         npages_read = i + (page_rc != 0 ? 1 : 0);
2281                         /* All subsequent pages should be 0 */
2282                         while (++i < npages)
2283                                 LASSERT(local_nb[i].lnb_rc == 0);
2284                         break;
2285                 }
2286         }
2287
2288         if (body->oa.o_valid & OBD_MD_FLCKSUM) {
2289                 u32 flag = body->oa.o_valid & OBD_MD_FLFLAGS ?
2290                            body->oa.o_flags : 0;
2291                 enum cksum_types cksum_type = obd_cksum_type_unpack(flag);
2292
2293                 repbody->oa.o_flags = obd_cksum_type_pack(obd_name,
2294                                                           cksum_type);
2295                 repbody->oa.o_valid = OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
2296
2297                 rc = tgt_checksum_niobuf_rw(tsi->tsi_tgt, cksum_type,
2298                                             local_nb, npages_read, OST_READ,
2299                                             &repbody->oa.o_cksum);
2300                 if (rc < 0)
2301                         GOTO(out_commitrw, rc);
2302                 CDEBUG(D_PAGE, "checksum at read origin: %x\n",
2303                        repbody->oa.o_cksum);
2304
2305                 /* if a resend it could be for a cksum error, so check Server
2306                  * cksum with returned Client cksum (this should even cover
2307                  * zero-cksum case) */
2308                 if ((body->oa.o_valid & OBD_MD_FLFLAGS) &&
2309                     (body->oa.o_flags & OBD_FL_RECOV_RESEND))
2310                         check_read_checksum(local_nb, npages_read, exp,
2311                                             &body->oa, &req->rq_peer,
2312                                             body->oa.o_cksum,
2313                                             repbody->oa.o_cksum, cksum_type);
2314         } else {
2315                 repbody->oa.o_valid = 0;
2316         }
2317         /* We're finishing using body->oa as an input variable */
2318
2319         /* Check if client was evicted while we were doing i/o before touching
2320          * network */
2321         if (rc == 0) {
2322                 if (body->oa.o_valid & OBD_MD_FLFLAGS &&
2323                     body->oa.o_flags & OBD_FL_SHORT_IO) {
2324                         unsigned char *short_io_buf;
2325                         int short_io_size;
2326
2327                         short_io_buf = req_capsule_server_get(&req->rq_pill,
2328                                                               &RMF_SHORT_IO);
2329                         short_io_size = req_capsule_get_size(&req->rq_pill,
2330                                                              &RMF_SHORT_IO,
2331                                                              RCL_SERVER);
2332                         rc = tgt_pages2shortio(local_nb, npages_read,
2333                                                short_io_buf, short_io_size);
2334                         if (rc >= 0)
2335                                 req_capsule_shrink(&req->rq_pill,
2336                                                    &RMF_SHORT_IO, rc,
2337                                                    RCL_SERVER);
2338                         rc = rc > 0 ? 0 : rc;
2339                 } else if (!CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2)) {
2340                         rc = target_bulk_io(exp, desc);
2341                 }
2342                 no_reply = rc != 0;
2343         } else {
2344                 if (body->oa.o_valid & OBD_MD_FLFLAGS &&
2345                     body->oa.o_flags & OBD_FL_SHORT_IO)
2346                         req_capsule_shrink(&req->rq_pill, &RMF_SHORT_IO, 0,
2347                                            RCL_SERVER);
2348         }
2349
2350 out_commitrw:
2351         /* Must commit after prep above in all cases */
2352         rc = obd_commitrw(tsi->tsi_env, OBD_BRW_READ, exp, &repbody->oa, 1, ioo,
2353                           remote_nb, npages, local_nb, rc);
2354 out_lock:
2355         tgt_brw_unlock(ioo, remote_nb, &lockh, LCK_PR);
2356
2357         if (desc && !CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2))
2358                 ptlrpc_free_bulk(desc);
2359
2360         LASSERT(rc <= 0);
2361         if (rc == 0) {
2362                 rc = nob;
2363                 ptlrpc_lprocfs_brw(req, nob);
2364         } else if (no_reply) {
2365                 req->rq_no_reply = 1;
2366                 /* reply out callback would free */
2367                 ptlrpc_req_drop_rs(req);
2368                 LCONSOLE_WARN("%s: Bulk IO read error with %s (at %s), "
2369                               "client will retry: rc %d\n",
2370                               obd_name,
2371                               obd_uuid2str(&exp->exp_client_uuid),
2372                               obd_export_nid2str(exp), rc);
2373         }
2374         /* send a bulk after reply to simulate a network delay or reordering
2375          * by a router - Note that !desc implies short io, so there is no bulk
2376          * to reorder. */
2377         if (unlikely(CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2)) &&
2378             desc) {
2379                 CDEBUG(D_INFO, "reorder BULK\n");
2380
2381                 ssleep(3);
2382                 target_bulk_io(exp, desc);
2383                 ptlrpc_free_bulk(desc);
2384         }
2385
2386         RETURN(rc);
2387 }
2388 EXPORT_SYMBOL(tgt_brw_read);
2389
2390 static int tgt_shortio2pages(struct niobuf_local *local, int npages,
2391                              unsigned char *buf, unsigned int size)
2392 {
2393         int     i, off, len;
2394         char    *ptr;
2395
2396         for (i = 0; i < npages; i++) {
2397                 off = local[i].lnb_page_offset & ~PAGE_MASK;
2398                 len = local[i].lnb_len;
2399
2400                 if (len == 0)
2401                         continue;
2402
2403                 CDEBUG(D_PAGE, "index %d offset = %d len = %d left = %d\n",
2404                        i, off, len, size);
2405                 ptr = kmap_atomic(local[i].lnb_page);
2406                 if (ptr == NULL)
2407                         return -EINVAL;
2408                 memcpy(ptr + off, buf, len < size ? len : size);
2409                 kunmap_atomic(ptr);
2410                 buf += len;
2411                 size -= len;
2412         }
2413         return 0;
2414 }
2415
2416 static void tgt_warn_on_cksum(struct ptlrpc_request *req,
2417                               struct ptlrpc_bulk_desc *desc,
2418                               struct niobuf_local *local_nb, int npages,
2419                               u32 client_cksum, u32 server_cksum,
2420                               bool mmap)
2421 {
2422         struct obd_export *exp = req->rq_export;
2423         struct ost_body *body;
2424         char *router = "";
2425         char *via = "";
2426
2427         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
2428         LASSERT(body != NULL);
2429
2430         if (desc && req->rq_peer.nid != desc->bd_sender) {
2431                 via = " via ";
2432                 router = libcfs_nid2str(desc->bd_sender);
2433         }
2434
2435         if (exp->exp_obd->obd_checksum_dump)
2436                 dump_all_bulk_pages(&body->oa, npages, local_nb, server_cksum,
2437                                     client_cksum);
2438
2439         if (mmap) {
2440                 CDEBUG_LIMIT(D_INFO, "client csum %x, server csum %x\n",
2441                              client_cksum, server_cksum);
2442                 return;
2443         }
2444
2445         LCONSOLE_ERROR_MSG(0x168, "%s: BAD WRITE CHECKSUM: from %s%s%s inode "
2446                            DFID" object "DOSTID" extent [%llu-%llu"
2447                            "]: client csum %x, server csum %x\n",
2448                            exp->exp_obd->obd_name, libcfs_id2str(req->rq_peer),
2449                            via, router,
2450                            body->oa.o_valid & OBD_MD_FLFID ?
2451                            body->oa.o_parent_seq : (__u64)0,
2452                            body->oa.o_valid & OBD_MD_FLFID ?
2453                            body->oa.o_parent_oid : 0,
2454                            body->oa.o_valid & OBD_MD_FLFID ?
2455                            body->oa.o_parent_ver : 0,
2456                            POSTID(&body->oa.o_oi),
2457                            local_nb[0].lnb_file_offset,
2458                            local_nb[npages-1].lnb_file_offset +
2459                            local_nb[npages - 1].lnb_len - 1,
2460                            client_cksum, server_cksum);
2461 }
2462
2463 int tgt_brw_write(struct tgt_session_info *tsi)
2464 {
2465         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2466         struct ptlrpc_bulk_desc *desc = NULL;
2467         struct obd_export       *exp = req->rq_export;
2468         struct niobuf_remote    *remote_nb;
2469         struct niobuf_local     *local_nb;
2470         struct obd_ioobj        *ioo;
2471         struct ost_body         *body, *repbody;
2472         struct lustre_handle     lockh = {0};
2473         __u32                   *rcs;
2474         int                      objcount, niocount, npages;
2475         int                      rc, i, j;
2476         enum cksum_types cksum_type = OBD_CKSUM_CRC32;
2477         bool                     no_reply = false, mmap;
2478         struct tgt_thread_big_cache *tbc = req->rq_svc_thread->t_data;
2479         bool wait_sync = false;
2480         const char *obd_name = exp->exp_obd->obd_name;
2481         /* '1' for consistency with code that checks !mpflag to restore */
2482         unsigned int mpflags = 1;
2483
2484         ENTRY;
2485
2486         if (ptlrpc_req2svc(req)->srv_req_portal != OST_IO_PORTAL &&
2487             ptlrpc_req2svc(req)->srv_req_portal != MDS_IO_PORTAL) {
2488                 CERROR("%s: deny write request from %s to portal %u\n",
2489                        tgt_name(tsi->tsi_tgt),
2490                        obd_export_nid2str(req->rq_export),
2491                        ptlrpc_req2svc(req)->srv_req_portal);
2492                 RETURN(err_serious(-EPROTO));
2493         }
2494
2495         if (OBD_FAIL_CHECK(OBD_FAIL_OST_ENOSPC))
2496                 RETURN(err_serious(-ENOSPC));
2497         if (OBD_FAIL_TIMEOUT(OBD_FAIL_OST_EROFS, 1))
2498                 RETURN(err_serious(-EROFS));
2499
2500         req->rq_bulk_write = 1;
2501
2502         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_WRITE_BULK))
2503                 RETURN(err_serious(-EIO));
2504         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_WRITE_BULK2))
2505                 RETURN(err_serious(-EFAULT));
2506
2507         /* pause before transaction has been started */
2508         CFS_FAIL_TIMEOUT(OBD_FAIL_OST_BRW_PAUSE_BULK, cfs_fail_val > 0 ?
2509                          cfs_fail_val : (obd_timeout + 1) / 4);
2510
2511         /* Delay write commit to show stale size information */
2512         CFS_FAIL_TIMEOUT(OBD_FAIL_OSC_NO_SIZE_DATA, cfs_fail_val);
2513
2514         /* There must be big cache in current thread to process this request
2515          * if it is NULL then something went wrong and it wasn't allocated,
2516          * report -ENOMEM in that case */
2517         if (tbc == NULL)
2518                 RETURN(-ENOMEM);
2519
2520         body = tsi->tsi_ost_body;
2521         LASSERT(body != NULL);
2522
2523         ioo = req_capsule_client_get(&req->rq_pill, &RMF_OBD_IOOBJ);
2524         LASSERT(ioo != NULL); /* must exists after tgt_ost_body_unpack */
2525
2526         objcount = req_capsule_get_size(&req->rq_pill, &RMF_OBD_IOOBJ,
2527                                         RCL_CLIENT) / sizeof(*ioo);
2528
2529         for (niocount = i = 0; i < objcount; i++)
2530                 niocount += ioo[i].ioo_bufcnt;
2531
2532         remote_nb = req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE);
2533         LASSERT(remote_nb != NULL); /* must exists after tgt_ost_body_unpack */
2534         if (niocount != req_capsule_get_size(&req->rq_pill,
2535                                              &RMF_NIOBUF_REMOTE, RCL_CLIENT) /
2536                         sizeof(*remote_nb))
2537                 RETURN(err_serious(-EPROTO));
2538
2539         if ((remote_nb[0].rnb_flags & OBD_BRW_MEMALLOC) &&
2540             ptlrpc_connection_is_local(exp->exp_connection))
2541                 mpflags = memalloc_noreclaim_save();
2542
2543         req_capsule_set_size(&req->rq_pill, &RMF_RCS, RCL_SERVER,
2544                              niocount * sizeof(*rcs));
2545         rc = req_capsule_server_pack(&req->rq_pill);
2546         if (rc != 0)
2547                 GOTO(out, rc = err_serious(rc));
2548
2549         CFS_FAIL_TIMEOUT(OBD_FAIL_OST_BRW_PAUSE_PACK, cfs_fail_val);
2550         rcs = req_capsule_server_get(&req->rq_pill, &RMF_RCS);
2551
2552         local_nb = tbc->local;
2553
2554         rc = tgt_brw_lock(tsi->tsi_env, exp, &tsi->tsi_resid, ioo, remote_nb,
2555                           &lockh, LCK_PW);
2556         if (rc != 0)
2557                 GOTO(out, rc);
2558
2559         /*
2560          * If getting the lock took more time than
2561          * client was willing to wait, drop it. b=11330
2562          */
2563         if (ktime_get_real_seconds() > req->rq_deadline ||
2564             OBD_FAIL_CHECK(OBD_FAIL_OST_DROP_REQ)) {
2565                 no_reply = true;
2566                 CERROR("%s: Dropping timed-out write from %s because locking object " DOSTID " took %lld seconds (limit was %lld).\n",
2567                        tgt_name(tsi->tsi_tgt), libcfs_id2str(req->rq_peer),
2568                        POSTID(&ioo->ioo_oid),
2569                        ktime_get_real_seconds() - req->rq_arrival_time.tv_sec,
2570                        req->rq_deadline - req->rq_arrival_time.tv_sec);
2571                 GOTO(out_lock, rc = -ETIMEDOUT);
2572         }
2573
2574         /* Because we already sync grant info with client when reconnect,
2575          * grant info will be cleared for resent req, then fed_grant and
2576          * total_grant will not be modified in following preprw_write */
2577         if (lustre_msg_get_flags(req->rq_reqmsg) & (MSG_RESENT | MSG_REPLAY)) {
2578                 DEBUG_REQ(D_CACHE, req, "clear resent/replay req grant info");
2579                 body->oa.o_valid &= ~OBD_MD_FLGRANT;
2580         }
2581
2582         repbody = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
2583         if (repbody == NULL)
2584                 GOTO(out_lock, rc = -ENOMEM);
2585         repbody->oa = body->oa;
2586
2587         npages = PTLRPC_MAX_BRW_PAGES;
2588         rc = obd_preprw(tsi->tsi_env, OBD_BRW_WRITE, exp, &repbody->oa,
2589                         objcount, ioo, remote_nb, &npages, local_nb);
2590         if (rc < 0)
2591                 GOTO(out_lock, rc);
2592         if (body->oa.o_valid & OBD_MD_FLFLAGS &&
2593             body->oa.o_flags & OBD_FL_SHORT_IO) {
2594                 unsigned int short_io_size;
2595                 unsigned char *short_io_buf;
2596
2597                 short_io_size = req_capsule_get_size(&req->rq_pill,
2598                                                      &RMF_SHORT_IO,
2599                                                      RCL_CLIENT);
2600                 short_io_buf = req_capsule_client_get(&req->rq_pill,
2601                                                       &RMF_SHORT_IO);
2602                 CDEBUG(D_INFO, "Client use short io for data transfer,"
2603                                " size = %d\n", short_io_size);
2604
2605                 /* Copy short io buf to pages */
2606                 rc = tgt_shortio2pages(local_nb, npages, short_io_buf,
2607                                        short_io_size);
2608                 desc = NULL;
2609         } else {
2610                 desc = ptlrpc_prep_bulk_exp(req, npages, ioobj_max_brw_get(ioo),
2611                                             PTLRPC_BULK_GET_SINK,
2612                                             OST_BULK_PORTAL,
2613                                             &ptlrpc_bulk_kiov_nopin_ops);
2614                 if (desc == NULL)
2615                         GOTO(skip_transfer, rc = -ENOMEM);
2616
2617                 /* NB Having prepped, we must commit... */
2618                 for (i = 0; i < npages; i++)
2619                         desc->bd_frag_ops->add_kiov_frag(desc,
2620                                         local_nb[i].lnb_page,
2621                                         local_nb[i].lnb_page_offset & ~PAGE_MASK,
2622                                         local_nb[i].lnb_len);
2623
2624                 rc = sptlrpc_svc_prep_bulk(req, desc);
2625                 if (rc != 0)
2626                         GOTO(skip_transfer, rc);
2627
2628                 rc = target_bulk_io(exp, desc);
2629         }
2630
2631         no_reply = rc != 0;
2632
2633 skip_transfer:
2634         if (body->oa.o_valid & OBD_MD_FLCKSUM && rc == 0) {
2635                 static int cksum_counter;
2636
2637                 if (body->oa.o_valid & OBD_MD_FLFLAGS)
2638                         cksum_type = obd_cksum_type_unpack(body->oa.o_flags);
2639
2640                 repbody->oa.o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
2641                 repbody->oa.o_flags &= ~OBD_FL_CKSUM_ALL;
2642                 repbody->oa.o_flags |= obd_cksum_type_pack(obd_name,
2643                                                            cksum_type);
2644
2645                 rc = tgt_checksum_niobuf_rw(tsi->tsi_tgt, cksum_type,
2646                                             local_nb, npages, OST_WRITE,
2647                                             &repbody->oa.o_cksum);
2648                 if (rc < 0)
2649                         GOTO(out_commitrw, rc);
2650
2651                 cksum_counter++;
2652
2653                 if (unlikely(body->oa.o_cksum != repbody->oa.o_cksum)) {
2654                         mmap = (body->oa.o_valid & OBD_MD_FLFLAGS &&
2655                                 body->oa.o_flags & OBD_FL_MMAP);
2656
2657                         tgt_warn_on_cksum(req, desc, local_nb, npages,
2658                                           body->oa.o_cksum,
2659                                           repbody->oa.o_cksum, mmap);
2660                         cksum_counter = 0;
2661                 } else if ((cksum_counter & (-cksum_counter)) ==
2662                            cksum_counter) {
2663                         CDEBUG(D_INFO, "Checksum %u from %s OK: %x\n",
2664                                cksum_counter, libcfs_id2str(req->rq_peer),
2665                                repbody->oa.o_cksum);
2666                 }
2667         }
2668
2669 out_commitrw:
2670         /* Must commit after prep above in all cases */
2671         rc = obd_commitrw(tsi->tsi_env, OBD_BRW_WRITE, exp, &repbody->oa,
2672                           objcount, ioo, remote_nb, npages, local_nb, rc);
2673         if (rc == -ENOTCONN)
2674                 /* quota acquire process has been given up because
2675                  * either the client has been evicted or the client
2676                  * has timed out the request already */
2677                 no_reply = true;
2678
2679         for (i = 0; i < niocount; i++) {
2680                 if (!(local_nb[i].lnb_flags & OBD_BRW_ASYNC)) {
2681                         wait_sync = true;
2682                         break;
2683                 }
2684         }
2685         /*
2686          * Disable sending mtime back to the client. If the client locked the
2687          * whole object, then it has already updated the mtime on its side,
2688          * otherwise it will have to glimpse anyway (see bug 21489, comment 32)
2689          */
2690         repbody->oa.o_valid &= ~(OBD_MD_FLMTIME | OBD_MD_FLATIME);
2691
2692         if (rc == 0) {
2693                 int nob = 0;
2694
2695                 /* set per-requested niobuf return codes */
2696                 for (i = j = 0; i < niocount; i++) {
2697                         int len = remote_nb[i].rnb_len;
2698
2699                         nob += len;
2700                         rcs[i] = 0;
2701                         do {
2702                                 LASSERT(j < npages);
2703                                 if (local_nb[j].lnb_rc < 0)
2704                                         rcs[i] = local_nb[j].lnb_rc;
2705                                 len -= local_nb[j].lnb_len;
2706                                 j++;
2707                         } while (len > 0);
2708                         LASSERT(len == 0);
2709                 }
2710                 LASSERT(j == npages);
2711                 ptlrpc_lprocfs_brw(req, nob);
2712         }
2713 out_lock:
2714         tgt_brw_unlock(ioo, remote_nb, &lockh, LCK_PW);
2715         if (desc)
2716                 ptlrpc_free_bulk(desc);
2717 out:
2718         if (unlikely(no_reply || (exp->exp_obd->obd_no_transno && wait_sync))) {
2719                 req->rq_no_reply = 1;
2720                 /* reply out callback would free */
2721                 ptlrpc_req_drop_rs(req);
2722                 if (!exp->exp_obd->obd_no_transno)
2723                         LCONSOLE_WARN("%s: Bulk IO write error with %s (at %s),"
2724                                       " client will retry: rc = %d\n",
2725                                       obd_name,
2726                                       obd_uuid2str(&exp->exp_client_uuid),
2727                                       obd_export_nid2str(exp), rc);
2728         }
2729
2730         if (mpflags)
2731                 memalloc_noreclaim_restore(mpflags);
2732
2733         RETURN(rc);
2734 }
2735 EXPORT_SYMBOL(tgt_brw_write);
2736
2737 /* Check if request can be reconstructed from saved reply data
2738  * A copy of the reply data is returned in @trd if the pointer is not NULL
2739  */
2740 int req_can_reconstruct(struct ptlrpc_request *req,
2741                          struct tg_reply_data *trd)
2742 {
2743         struct tg_export_data *ted = &req->rq_export->exp_target_data;
2744         struct lsd_client_data *lcd = ted->ted_lcd;
2745         int found;
2746
2747         if (tgt_is_multimodrpcs_client(req->rq_export))
2748                 return tgt_lookup_reply(req, trd);
2749
2750         mutex_lock(&ted->ted_lcd_lock);
2751         found = req->rq_xid == lcd->lcd_last_xid ||
2752                 req->rq_xid == lcd->lcd_last_close_xid;
2753
2754         if (found && trd != NULL) {
2755                 if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE) {
2756                         trd->trd_reply.lrd_xid = lcd->lcd_last_close_xid;
2757                         trd->trd_reply.lrd_transno =
2758                                                 lcd->lcd_last_close_transno;
2759                         trd->trd_reply.lrd_result = lcd->lcd_last_close_result;
2760                 } else {
2761                         trd->trd_reply.lrd_xid = lcd->lcd_last_xid;
2762                         trd->trd_reply.lrd_transno = lcd->lcd_last_transno;
2763                         trd->trd_reply.lrd_result = lcd->lcd_last_result;
2764                         trd->trd_reply.lrd_data = lcd->lcd_last_data;
2765                         trd->trd_pre_versions[0] = lcd->lcd_pre_versions[0];
2766                         trd->trd_pre_versions[1] = lcd->lcd_pre_versions[1];
2767                         trd->trd_pre_versions[2] = lcd->lcd_pre_versions[2];
2768                         trd->trd_pre_versions[3] = lcd->lcd_pre_versions[3];
2769                 }
2770         }
2771         mutex_unlock(&ted->ted_lcd_lock);
2772
2773         return found;
2774 }
2775 EXPORT_SYMBOL(req_can_reconstruct);
2776