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, 2016, Intel Corporation.
  25  */
  26 /*
  27  * lustre/target/tgt_handler.c
  28  *
  29  * Lustre Unified Target request handler code
  30  *
  31  * Author: Brian Behlendorf <behlendorf1@llnl.gov>
  32  * Author: Mikhail Pershin <mike.pershin@intel.com>
  33  */
  34
  35 #define DEBUG_SUBSYSTEM S_CLASS
  36
  37 #include <linux/user_namespace.h>
  38 #ifdef HAVE_UIDGID_HEADER
  39 # include <linux/uidgid.h>
  40 #endif
  41
  42 #include <obd.h>
  43 #include <obd_class.h>
  44 #include <obd_cksum.h>
  45 #include <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 HABEO_CORPUS flag is set for this request type check whether object
  67  *  actually exists on storage (lu_object_exists()).
  68  *
  69  */
  70 static int tgt_mdt_body_unpack(struct tgt_session_info *tsi, __u32 flags)
  71 {
  72         const struct mdt_body   *body;
  73         struct lu_object        *obj;
  74         struct req_capsule      *pill = tsi->tsi_pill;
  75         int                      rc;
  76
  77         ENTRY;
  78
  79         body = req_capsule_client_get(pill, &RMF_MDT_BODY);
  80         if (body == NULL)
  81                 RETURN(-EFAULT);
  82
  83         tsi->tsi_mdt_body = body;
  84
  85         if (!(body->mbo_valid & OBD_MD_FLID))
  86                 RETURN(0);
  87
  88         /* mdc_pack_body() doesn't check if fid is zero and set OBD_ML_FID
  89          * in any case in pre-2.5 clients. Fix that here if needed */
  90         if (unlikely(fid_is_zero(&body->mbo_fid1)))
  91                 RETURN(0);
  92
  93         if (!fid_is_sane(&body->mbo_fid1)) {
  94                 CERROR("%s: invalid FID: "DFID"\n", tgt_name(tsi->tsi_tgt),
  95                        PFID(&body->mbo_fid1));
  96                 RETURN(-EINVAL);
  97         }
  98
  99         obj = lu_object_find(tsi->tsi_env,
 100                              &tsi->tsi_tgt->lut_bottom->dd_lu_dev,
 101                              &body->mbo_fid1, NULL);
 102         if (!IS_ERR(obj)) {
 103                 if ((flags & HABEO_CORPUS) && !lu_object_exists(obj)) {
 104                         lu_object_put(tsi->tsi_env, obj);
 105                         rc = -ENOENT;
 106                 } else {
 107                         tsi->tsi_corpus = obj;
 108                         rc = 0;
 109                 }
 110         } else {
 111                 rc = PTR_ERR(obj);
 112         }
 113
 114         tsi->tsi_fid = body->mbo_fid1;
 115
 116         RETURN(rc);
 117 }
 118
 119 /**
 120  * Validate oa from client.
 121  * If the request comes from 2.0 clients, currently only RSVD seq and IDIF
 122  * req are valid.
 123  *    a. objects in Single MDT FS  seq = FID_SEQ_OST_MDT0, oi_id != 0
 124  *    b. Echo objects(seq = 2), old echo client still use oi_id/oi_seq to
 125  *       pack ost_id. Because non-zero oi_seq will make it diffcult to tell
 126  *       whether this is oi_fid or real ostid. So it will check
 127  *       OBD_CONNECT_FID, then convert the ostid to FID for old client.
 128  *    c. Old FID-disable osc will send IDIF.
 129  *    d. new FID-enable osc/osp will send normal FID.
 130  *
 131  * And also oi_id/f_oid should always start from 1. oi_id/f_oid = 0 will
 132  * be used for LAST_ID file, and only being accessed inside OST now.
 133  */
 134 int tgt_validate_obdo(struct tgt_session_info *tsi, struct obdo *oa)
 135 {
 136         struct ost_id   *oi     = &oa->o_oi;
 137         u64              seq    = ostid_seq(oi);
 138         u64              id     = ostid_id(oi);
 139         int              rc;
 140         ENTRY;
 141
 142         if (unlikely(!(exp_connect_flags(tsi->tsi_exp) & OBD_CONNECT_FID) &&
 143                      fid_seq_is_echo(seq))) {
 144                 /* Sigh 2.[123] client still sends echo req with oi_id = 0
 145                  * during create, and we will reset this to 1, since this
 146                  * oi_id is basically useless in the following create process,
 147                  * but oi_id == 0 will make it difficult to tell whether it is
 148                  * real FID or ost_id. */
 149                 oi->oi_fid.f_seq = FID_SEQ_ECHO;
 150                 oi->oi_fid.f_oid = id ?: 1;
 151                 oi->oi_fid.f_ver = 0;
 152         } else {
 153                 struct tgt_thread_info *tti = tgt_th_info(tsi->tsi_env);
 154
 155                 if (unlikely((oa->o_valid & OBD_MD_FLID) && id == 0))
 156                         GOTO(out, rc = -EPROTO);
 157
 158                 /* Note: this check might be forced in 2.5 or 2.6, i.e.
 159                  * all of the requests are required to setup FLGROUP */
 160                 if (unlikely(!(oa->o_valid & OBD_MD_FLGROUP))) {
 161                         ostid_set_seq_mdt0(oi);
 162                         oa->o_valid |= OBD_MD_FLGROUP;
 163                         seq = ostid_seq(oi);
 164                 }
 165
 166                 if (unlikely(!(fid_seq_is_idif(seq) || fid_seq_is_mdt0(seq) ||
 167                                fid_seq_is_norm(seq) || fid_seq_is_echo(seq))))
 168                         GOTO(out, rc = -EPROTO);
 169
 170                 rc = ostid_to_fid(&tti->tti_fid1, oi,
 171                                   tsi->tsi_tgt->lut_lsd.lsd_osd_index);
 172                 if (unlikely(rc != 0))
 173                         GOTO(out, rc);
 174
 175                 oi->oi_fid = tti->tti_fid1;
 176         }
 177
 178         RETURN(0);
 179
 180 out:
 181         CERROR("%s: client %s sent bad object "DOSTID": rc = %d\n",
 182                tgt_name(tsi->tsi_tgt), obd_export_nid2str(tsi->tsi_exp),
 183                seq, id, rc);
 184         return rc;
 185 }
 186 EXPORT_SYMBOL(tgt_validate_obdo);
 187
 188 static int tgt_io_data_unpack(struct tgt_session_info *tsi, struct ost_id *oi)
 189 {
 190         unsigned                 max_brw;
 191         struct niobuf_remote    *rnb;
 192         struct obd_ioobj        *ioo;
 193         int                      obj_count;
 194
 195         ENTRY;
 196
 197         ioo = req_capsule_client_get(tsi->tsi_pill, &RMF_OBD_IOOBJ);
 198         if (ioo == NULL)
 199                 RETURN(-EPROTO);
 200
 201         rnb = req_capsule_client_get(tsi->tsi_pill, &RMF_NIOBUF_REMOTE);
 202         if (rnb == NULL)
 203                 RETURN(-EPROTO);
 204
 205         max_brw = ioobj_max_brw_get(ioo);
 206         if (unlikely((max_brw & (max_brw - 1)) != 0)) {
 207                 CERROR("%s: client %s sent bad ioobj max %u for "DOSTID
 208                        ": rc = %d\n", tgt_name(tsi->tsi_tgt),
 209                        obd_export_nid2str(tsi->tsi_exp), max_brw,
 210                        POSTID(oi), -EPROTO);
 211                 RETURN(-EPROTO);
 212         }
 213         ioo->ioo_oid = *oi;
 214
 215         obj_count = req_capsule_get_size(tsi->tsi_pill, &RMF_OBD_IOOBJ,
 216                                         RCL_CLIENT) / sizeof(*ioo);
 217         if (obj_count == 0) {
 218                 CERROR("%s: short ioobj\n", tgt_name(tsi->tsi_tgt));
 219                 RETURN(-EPROTO);
 220         } else if (obj_count > 1) {
 221                 CERROR("%s: too many ioobjs (%d)\n", tgt_name(tsi->tsi_tgt),
 222                        obj_count);
 223                 RETURN(-EPROTO);
 224         }
 225
 226         if (ioo->ioo_bufcnt == 0) {
 227                 CERROR("%s: ioo has zero bufcnt\n", tgt_name(tsi->tsi_tgt));
 228                 RETURN(-EPROTO);
 229         }
 230
 231         if (ioo->ioo_bufcnt > PTLRPC_MAX_BRW_PAGES) {
 232                 DEBUG_REQ(D_RPCTRACE, tgt_ses_req(tsi),
 233                           "bulk has too many pages (%d)",
 234                           ioo->ioo_bufcnt);
 235                 RETURN(-EPROTO);
 236         }
 237
 238         RETURN(0);
 239 }
 240
 241 static int tgt_ost_body_unpack(struct tgt_session_info *tsi, __u32 flags)
 242 {
 243         struct ost_body         *body;
 244         struct req_capsule      *pill = tsi->tsi_pill;
 245         struct lu_nodemap       *nodemap;
 246         int                      rc;
 247
 248         ENTRY;
 249
 250         body = req_capsule_client_get(pill, &RMF_OST_BODY);
 251         if (body == NULL)
 252                 RETURN(-EFAULT);
 253
 254         rc = tgt_validate_obdo(tsi, &body->oa);
 255         if (rc)
 256                 RETURN(rc);
 257
 258         nodemap = nodemap_get_from_exp(tsi->tsi_exp);
 259         if (IS_ERR(nodemap))
 260                 RETURN(PTR_ERR(nodemap));
 261
 262         body->oa.o_uid = nodemap_map_id(nodemap, NODEMAP_UID,
 263                                         NODEMAP_CLIENT_TO_FS,
 264                                         body->oa.o_uid);
 265         body->oa.o_gid = nodemap_map_id(nodemap, NODEMAP_GID,
 266                                         NODEMAP_CLIENT_TO_FS,
 267                                         body->oa.o_gid);
 268         nodemap_putref(nodemap);
 269
 270         tsi->tsi_ost_body = body;
 271         tsi->tsi_fid = body->oa.o_oi.oi_fid;
 272
 273         if (req_capsule_has_field(pill, &RMF_OBD_IOOBJ, RCL_CLIENT)) {
 274                 rc = tgt_io_data_unpack(tsi, &body->oa.o_oi);
 275                 if (rc < 0)
 276                         RETURN(rc);
 277         }
 278
 279         if (!(body->oa.o_valid & OBD_MD_FLID)) {
 280                 if (flags & HABEO_CORPUS) {
 281                         CERROR("%s: OBD_MD_FLID flag is not set in ost_body "
 282                                "but OID/FID is mandatory with HABEO_CORPUS\n",
 283                                tgt_name(tsi->tsi_tgt));
 284                         RETURN(-EPROTO);
 285                 } else {
 286                         RETURN(0);
 287                 }
 288         }
 289
 290         ost_fid_build_resid(&tsi->tsi_fid, &tsi->tsi_resid);
 291
 292         /*
 293          * OST doesn't get object in advance for further use to prevent
 294          * situations with nested object_find which is potential deadlock.
 295          */
 296         tsi->tsi_corpus = NULL;
 297         RETURN(rc);
 298 }
 299
 300 /*
 301  * Do necessary preprocessing according to handler ->th_flags.
 302  */
 303 static int tgt_request_preprocess(struct tgt_session_info *tsi,
 304                                   struct tgt_handler *h,
 305                                   struct ptlrpc_request *req)
 306 {
 307         struct req_capsule      *pill = tsi->tsi_pill;
 308         __u32                    flags = h->th_flags;
 309         int                      rc = 0;
 310
 311         ENTRY;
 312
 313         if (tsi->tsi_preprocessed)
 314                 RETURN(0);
 315
 316         LASSERT(h->th_act != NULL);
 317         LASSERT(h->th_opc == lustre_msg_get_opc(req->rq_reqmsg));
 318         LASSERT(current->journal_info == NULL);
 319
 320         LASSERT(ergo(flags & (HABEO_CORPUS | HABEO_REFERO),
 321                      h->th_fmt != NULL));
 322         if (h->th_fmt != NULL) {
 323                 req_capsule_set(pill, h->th_fmt);
 324                 if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_CLIENT)) {
 325                         rc = tgt_mdt_body_unpack(tsi, flags);
 326                         if (rc < 0)
 327                                 RETURN(rc);
 328                 } else if (req_capsule_has_field(pill, &RMF_OST_BODY,
 329                                                  RCL_CLIENT)) {
 330                         rc = tgt_ost_body_unpack(tsi, flags);
 331                         if (rc < 0)
 332                                 RETURN(rc);
 333                 }
 334         }
 335
 336         if (flags & MUTABOR && tgt_conn_flags(tsi) & OBD_CONNECT_RDONLY)
 337                 RETURN(-EROFS);
 338
 339         if (flags & HABEO_CLAVIS) {
 340                 struct ldlm_request *dlm_req;
 341
 342                 LASSERT(h->th_fmt != NULL);
 343
 344                 dlm_req = req_capsule_client_get(pill, &RMF_DLM_REQ);
 345                 if (dlm_req != NULL) {
 346                         if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
 347                                      LDLM_IBITS &&
 348                                      dlm_req->lock_desc.l_policy_data.\
 349                                      l_inodebits.bits == 0)) {
 350                                 /*
 351                                  * Lock without inodebits makes no sense and
 352                                  * will oops later in ldlm. If client miss to
 353                                  * set such bits, do not trigger ASSERTION.
 354                                  *
 355                                  * For liblustre flock case, it maybe zero.
 356                                  */
 357                                 rc = -EPROTO;
 358                         } else {
 359                                 tsi->tsi_dlm_req = dlm_req;
 360                         }
 361                 } else {
 362                         rc = -EFAULT;
 363                 }
 364         }
 365         tsi->tsi_preprocessed = 1;
 366         RETURN(rc);
 367 }
 368
 369 /*
 370  * Invoke handler for this request opc. Also do necessary preprocessing
 371  * (according to handler ->th_flags), and post-processing (setting of
 372  * ->last_{xid,committed}).
 373  */
 374 static int tgt_handle_request0(struct tgt_session_info *tsi,
 375                                struct tgt_handler *h,
 376                                struct ptlrpc_request *req)
 377 {
 378         int      serious = 0;
 379         int      rc;
 380         __u32    opc = lustre_msg_get_opc(req->rq_reqmsg);
 381
 382         ENTRY;
 383
 384
 385         /* When dealing with sec context requests, no export is associated yet,
 386          * because these requests are sent before *_CONNECT requests.
 387          * A NULL req->rq_export means the normal *_common_slice handlers will
 388          * not be called, because there is no reference to the target.
 389          * So deal with them by hand and jump directly to target_send_reply().
 390          */
 391         switch (opc) {
 392         case SEC_CTX_INIT:
 393         case SEC_CTX_INIT_CONT:
 394         case SEC_CTX_FINI:
 395                 CFS_FAIL_TIMEOUT(OBD_FAIL_SEC_CTX_HDL_PAUSE, cfs_fail_val);
 396                 GOTO(out, rc = 0);
 397         }
 398
 399         /*
 400          * Checking for various OBD_FAIL_$PREF_$OPC_NET codes. _Do_ not try
 401          * to put same checks into handlers like mdt_close(), mdt_reint(),
 402          * etc., without talking to mdt authors first. Checking same thing
 403          * there again is useless and returning 0 error without packing reply
 404          * is buggy! Handlers either pack reply or return error.
 405          *
 406          * We return 0 here and do not send any reply in order to emulate
 407          * network failure. Do not send any reply in case any of NET related
 408          * fail_id has occured.
 409          */
 410         if (OBD_FAIL_CHECK_ORSET(h->th_fail_id, OBD_FAIL_ONCE))
 411                 RETURN(0);
 412         if (unlikely(lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT &&
 413                      OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_MULTI_NET)))
 414                 RETURN(0);
 415
 416         rc = tgt_request_preprocess(tsi, h, req);
 417         /* pack reply if reply format is fixed */
 418         if (rc == 0 && h->th_flags & HABEO_REFERO) {
 419                 /* Pack reply */
 420                 if (req_capsule_has_field(tsi->tsi_pill, &RMF_MDT_MD,
 421                                           RCL_SERVER))
 422                         req_capsule_set_size(tsi->tsi_pill, &RMF_MDT_MD,
 423                                              RCL_SERVER,
 424                                              tsi->tsi_mdt_body->mbo_eadatasize);
 425                 if (req_capsule_has_field(tsi->tsi_pill, &RMF_LOGCOOKIES,
 426                                           RCL_SERVER))
 427                         req_capsule_set_size(tsi->tsi_pill, &RMF_LOGCOOKIES,
 428                                              RCL_SERVER, 0);
 429                 if (req_capsule_has_field(tsi->tsi_pill, &RMF_ACL, RCL_SERVER))
 430                         req_capsule_set_size(tsi->tsi_pill,
 431                                              &RMF_ACL, RCL_SERVER,
 432                                              LUSTRE_POSIX_ACL_MAX_SIZE_OLD);
 433
 434                 rc = req_capsule_server_pack(tsi->tsi_pill);
 435         }
 436
 437         if (likely(rc == 0)) {
 438                 /*
 439                  * Process request, there can be two types of rc:
 440                  * 1) errors with msg unpack/pack, other failures outside the
 441                  * operation itself. This is counted as serious errors;
 442                  * 2) errors during fs operation, should be placed in rq_status
 443                  * only
 444                  */
 445                 rc = h->th_act(tsi);
 446                 if (!is_serious(rc) &&
 447                     !req->rq_no_reply && req->rq_reply_state == NULL) {
 448                         DEBUG_REQ(D_ERROR, req, "%s \"handler\" %s did not "
 449                                   "pack reply and returned 0 error\n",
 450                                   tgt_name(tsi->tsi_tgt), h->th_name);
 451                         LBUG();
 452                 }
 453                 serious = is_serious(rc);
 454                 rc = clear_serious(rc);
 455         } else {
 456                 serious = 1;
 457         }
 458
 459         req->rq_status = rc;
 460
 461         /*
 462          * ELDLM_* codes which > 0 should be in rq_status only as well as
 463          * all non-serious errors.
 464          */
 465         if (rc > 0 || !serious)
 466                 rc = 0;
 467
 468         LASSERT(current->journal_info == NULL);
 469
 470         if (likely(rc == 0 && req->rq_export))
 471                 target_committed_to_req(req);
 472
 473 out:
 474         target_send_reply(req, rc, tsi->tsi_reply_fail_id);
 475         RETURN(0);
 476 }
 477
 478 static int tgt_filter_recovery_request(struct ptlrpc_request *req,
 479                                        struct obd_device *obd, int *process)
 480 {
 481         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
 482         case MDS_DISCONNECT:
 483         case OST_DISCONNECT:
 484         case OBD_IDX_READ:
 485                 *process = 1;
 486                 RETURN(0);
 487         case MDS_CLOSE:
 488         case MDS_SYNC: /* used in unmounting */
 489         case OBD_PING:
 490         case MDS_REINT:
 491         case OUT_UPDATE:
 492         case SEQ_QUERY:
 493         case FLD_QUERY:
 494         case FLD_READ:
 495         case LDLM_ENQUEUE:
 496         case OST_CREATE:
 497         case OST_DESTROY:
 498         case OST_PUNCH:
 499         case OST_SETATTR:
 500         case OST_SYNC:
 501         case OST_WRITE:
 502         case MDS_HSM_PROGRESS:
 503         case MDS_HSM_STATE_SET:
 504         case MDS_HSM_REQUEST:
 505                 *process = target_queue_recovery_request(req, obd);
 506                 RETURN(0);
 507
 508         default:
 509                 DEBUG_REQ(D_ERROR, req, "not permitted during recovery");
 510                 *process = -EAGAIN;
 511                 RETURN(0);
 512         }
 513 }
 514
 515 /*
 516  * Handle recovery. Return:
 517  *        +1: continue request processing;
 518  *       -ve: abort immediately with the given error code;
 519  *         0: send reply with error code in req->rq_status;
 520  */
 521 static int tgt_handle_recovery(struct ptlrpc_request *req, int reply_fail_id)
 522 {
 523         ENTRY;
 524
 525         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
 526         case MDS_CONNECT:
 527         case OST_CONNECT:
 528         case MGS_CONNECT:
 529         case SEC_CTX_INIT:
 530         case SEC_CTX_INIT_CONT:
 531         case SEC_CTX_FINI:
 532                 RETURN(+1);
 533         }
 534
 535         if (!req->rq_export->exp_obd->obd_replayable)
 536                 RETURN(+1);
 537
 538         /* sanity check: if the xid matches, the request must be marked as a
 539          * resent or replayed */
 540         if (req_can_reconstruct(req, NULL)) {
 541                 if (!(lustre_msg_get_flags(req->rq_reqmsg) &
 542                       (MSG_RESENT | MSG_REPLAY))) {
 543                         DEBUG_REQ(D_WARNING, req, "rq_xid %llu matches "
 544                                   "saved xid, expected REPLAY or RESENT flag "
 545                                   "(%x)", req->rq_xid,
 546                                   lustre_msg_get_flags(req->rq_reqmsg));
 547                         req->rq_status = -ENOTCONN;
 548                         RETURN(-ENOTCONN);
 549                 }
 550         }
 551         /* else: note the opposite is not always true; a RESENT req after a
 552          * failover will usually not match the last_xid, since it was likely
 553          * never committed. A REPLAYed request will almost never match the
 554          * last xid, however it could for a committed, but still retained,
 555          * open. */
 556
 557         /* Check for aborted recovery... */
 558         if (unlikely(req->rq_export->exp_obd->obd_recovering)) {
 559                 int rc;
 560                 int should_process;
 561
 562                 DEBUG_REQ(D_INFO, req, "Got new replay");
 563                 rc = tgt_filter_recovery_request(req, req->rq_export->exp_obd,
 564                                                  &should_process);
 565                 if (rc != 0 || !should_process)
 566                         RETURN(rc);
 567                 else if (should_process < 0) {
 568                         req->rq_status = should_process;
 569                         rc = ptlrpc_error(req);
 570                         RETURN(rc);
 571                 }
 572         }
 573         RETURN(+1);
 574 }
 575
 576 /* Initial check for request, it is validation mostly */
 577 static struct tgt_handler *tgt_handler_find_check(struct ptlrpc_request *req)
 578 {
 579         struct tgt_handler      *h;
 580         struct tgt_opc_slice    *s;
 581         struct lu_target        *tgt;
 582         __u32                    opc = lustre_msg_get_opc(req->rq_reqmsg);
 583
 584         ENTRY;
 585
 586         tgt = class_exp2tgt(req->rq_export);
 587         if (unlikely(tgt == NULL)) {
 588                 DEBUG_REQ(D_ERROR, req, "%s: No target for connected export\n",
 589                           class_exp2obd(req->rq_export)->obd_name);
 590                 RETURN(ERR_PTR(-EINVAL));
 591         }
 592
 593         for (s = tgt->lut_slice; s->tos_hs != NULL; s++)
 594                 if (s->tos_opc_start <= opc && opc < s->tos_opc_end)
 595                         break;
 596
 597         /* opcode was not found in slice */
 598         if (unlikely(s->tos_hs == NULL)) {
 599                 CERROR("%s: no handlers for opcode 0x%x\n", tgt_name(tgt),
 600                        opc);
 601                 RETURN(ERR_PTR(-ENOTSUPP));
 602         }
 603
 604         LASSERT(opc >= s->tos_opc_start && opc < s->tos_opc_end);
 605         h = s->tos_hs + (opc - s->tos_opc_start);
 606         if (unlikely(h->th_opc == 0)) {
 607                 CERROR("%s: unsupported opcode 0x%x\n", tgt_name(tgt), opc);
 608                 RETURN(ERR_PTR(-ENOTSUPP));
 609         }
 610
 611         RETURN(h);
 612 }
 613
 614 static int process_req_last_xid(struct ptlrpc_request *req)
 615 {
 616         __u64   last_xid;
 617         ENTRY;
 618
 619         /* check request's xid is consistent with export's last_xid */
 620         last_xid = lustre_msg_get_last_xid(req->rq_reqmsg);
 621         if (last_xid > req->rq_export->exp_last_xid)
 622                 req->rq_export->exp_last_xid = last_xid;
 623
 624         if (req->rq_xid == 0 ||
 625             (req->rq_xid <= req->rq_export->exp_last_xid)) {
 626                 DEBUG_REQ(D_ERROR, req, "Unexpected xid %llx vs. "
 627                           "last_xid %llx\n", req->rq_xid,
 628                           req->rq_export->exp_last_xid);
 629                 /* Some request is allowed to be sent during replay,
 630                  * such as OUT update requests, FLD requests, so it
 631                  * is possible that replay requests has smaller XID
 632                  * than the exp_last_xid.
 633                  *
 634                  * Some non-replay requests may have smaller XID as
 635                  * well:
 636                  *
 637                  * - Client send a no_resend RPC, like statfs;
 638                  * - The RPC timedout (or some other error) on client,
 639                  *   then it's removed from the unreplied list;
 640                  * - Client send some other request to bump the
 641                  *   exp_last_xid on server;
 642                  * - The former RPC got chance to be processed;
 643                  */
 644                 if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY))
 645                         RETURN(-EPROTO);
 646         }
 647
 648         /* try to release in-memory reply data */
 649         if (tgt_is_multimodrpcs_client(req->rq_export)) {
 650                 tgt_handle_received_xid(req->rq_export,
 651                                 lustre_msg_get_last_xid(req->rq_reqmsg));
 652                 if (!(lustre_msg_get_flags(req->rq_reqmsg) &
 653                       (MSG_RESENT | MSG_REPLAY)))
 654                         tgt_handle_tag(req->rq_export,
 655                                        lustre_msg_get_tag(req->rq_reqmsg));
 656         }
 657         RETURN(0);
 658 }
 659
 660 int tgt_request_handle(struct ptlrpc_request *req)
 661 {
 662         struct tgt_session_info *tsi = tgt_ses_info(req->rq_svc_thread->t_env);
 663
 664         struct lustre_msg       *msg = req->rq_reqmsg;
 665         struct tgt_handler      *h;
 666         struct lu_target        *tgt;
 667         int                      request_fail_id = 0;
 668         __u32                    opc = lustre_msg_get_opc(msg);
 669         struct obd_device       *obd;
 670         int                      rc;
 671         bool                     is_connect = false;
 672         ENTRY;
 673
 674         /* Refill the context, to make sure all thread keys are allocated */
 675         lu_env_refill(req->rq_svc_thread->t_env);
 676
 677         req_capsule_init(&req->rq_pill, req, RCL_SERVER);
 678         tsi->tsi_pill = &req->rq_pill;
 679         tsi->tsi_env = req->rq_svc_thread->t_env;
 680
 681         /* if request has export then get handlers slice from corresponding
 682          * target, otherwise that should be connect operation */
 683         if (opc == MDS_CONNECT || opc == OST_CONNECT ||
 684             opc == MGS_CONNECT) {
 685                 is_connect = true;
 686                 req_capsule_set(&req->rq_pill, &RQF_CONNECT);
 687                 rc = target_handle_connect(req);
 688                 if (rc != 0) {
 689                         rc = ptlrpc_error(req);
 690                         GOTO(out, rc);
 691                 }
 692                 /* recovery-small test 18c asks to drop connect reply */
 693                 if (unlikely(opc == OST_CONNECT &&
 694                              OBD_FAIL_CHECK(OBD_FAIL_OST_CONNECT_NET2)))
 695                         GOTO(out, rc = 0);
 696         }
 697
 698         if (unlikely(!class_connected_export(req->rq_export))) {
 699                 if (opc == SEC_CTX_INIT || opc == SEC_CTX_INIT_CONT ||
 700                     opc == SEC_CTX_FINI) {
 701                         /* sec context initialization has to be handled
 702                          * by hand in tgt_handle_request0() */
 703                         tsi->tsi_reply_fail_id = OBD_FAIL_SEC_CTX_INIT_NET;
 704                         h = NULL;
 705                         GOTO(handle_recov, rc = 0);
 706                 }
 707                 CDEBUG(D_HA, "operation %d on unconnected OST from %s\n",
 708                        opc, libcfs_id2str(req->rq_peer));
 709                 req->rq_status = -ENOTCONN;
 710                 rc = ptlrpc_error(req);
 711                 GOTO(out, rc);
 712         }
 713
 714         tsi->tsi_tgt = tgt = class_exp2tgt(req->rq_export);
 715         tsi->tsi_exp = req->rq_export;
 716         if (exp_connect_flags(req->rq_export) & OBD_CONNECT_JOBSTATS)
 717                 tsi->tsi_jobid = lustre_msg_get_jobid(req->rq_reqmsg);
 718         else
 719                 tsi->tsi_jobid = NULL;
 720
 721         if (tgt == NULL) {
 722                 DEBUG_REQ(D_ERROR, req, "%s: No target for connected export\n",
 723                           class_exp2obd(req->rq_export)->obd_name);
 724                 req->rq_status = -EINVAL;
 725                 rc = ptlrpc_error(req);
 726                 GOTO(out, rc);
 727         }
 728
 729         /* Skip last_xid processing for the recovery thread, otherwise, the
 730          * last_xid on same request could be processed twice: first time when
 731          * processing the incoming request, second time when the request is
 732          * being processed by recovery thread. */
 733         obd = class_exp2obd(req->rq_export);
 734         if (is_connect) {
 735                 /* reset the exp_last_xid on each connection. */
 736                 req->rq_export->exp_last_xid = 0;
 737         } else if (obd->obd_recovery_data.trd_processing_task !=
 738                    current_pid()) {
 739                 rc = process_req_last_xid(req);
 740                 if (rc) {
 741                         req->rq_status = rc;
 742                         rc = ptlrpc_error(req);
 743                         GOTO(out, rc);
 744                 }
 745         }
 746
 747         request_fail_id = tgt->lut_request_fail_id;
 748         tsi->tsi_reply_fail_id = tgt->lut_reply_fail_id;
 749
 750         h = tgt_handler_find_check(req);
 751         if (IS_ERR(h)) {
 752                 req->rq_status = PTR_ERR(h);
 753                 rc = ptlrpc_error(req);
 754                 GOTO(out, rc);
 755         }
 756
 757         LASSERTF(h->th_opc == opc, "opcode mismatch %d != %d\n",
 758                  h->th_opc, opc);
 759
 760         if (CFS_FAIL_CHECK_ORSET(request_fail_id, CFS_FAIL_ONCE))
 761                 GOTO(out, rc = 0);
 762
 763         rc = lustre_msg_check_version(msg, h->th_version);
 764         if (unlikely(rc)) {
 765                 DEBUG_REQ(D_ERROR, req, "%s: drop mal-formed request, version"
 766                           " %08x, expecting %08x\n", tgt_name(tgt),
 767                           lustre_msg_get_version(msg), h->th_version);
 768                 req->rq_status = -EINVAL;
 769                 rc = ptlrpc_error(req);
 770                 GOTO(out, rc);
 771         }
 772
 773 handle_recov:
 774         rc = tgt_handle_recovery(req, tsi->tsi_reply_fail_id);
 775         if (likely(rc == 1)) {
 776                 rc = tgt_handle_request0(tsi, h, req);
 777                 if (rc)
 778                         GOTO(out, rc);
 779         }
 780         EXIT;
 781 out:
 782         req_capsule_fini(tsi->tsi_pill);
 783         if (tsi->tsi_corpus != NULL) {
 784                 lu_object_put(tsi->tsi_env, tsi->tsi_corpus);
 785                 tsi->tsi_corpus = NULL;
 786         }
 787         return rc;
 788 }
 789 EXPORT_SYMBOL(tgt_request_handle);
 790
 791 /** Assign high priority operations to the request if needed. */
 792 int tgt_hpreq_handler(struct ptlrpc_request *req)
 793 {
 794         struct tgt_session_info *tsi = tgt_ses_info(req->rq_svc_thread->t_env);
 795         struct tgt_handler      *h;
 796         int                      rc;
 797
 798         ENTRY;
 799
 800         if (req->rq_export == NULL)
 801                 RETURN(0);
 802
 803         req_capsule_init(&req->rq_pill, req, RCL_SERVER);
 804         tsi->tsi_pill = &req->rq_pill;
 805         tsi->tsi_env = req->rq_svc_thread->t_env;
 806         tsi->tsi_tgt = class_exp2tgt(req->rq_export);
 807         tsi->tsi_exp = req->rq_export;
 808
 809         h = tgt_handler_find_check(req);
 810         if (IS_ERR(h)) {
 811                 rc = PTR_ERR(h);
 812                 RETURN(rc);
 813         }
 814
 815         rc = tgt_request_preprocess(tsi, h, req);
 816         if (unlikely(rc != 0))
 817                 RETURN(rc);
 818
 819         if (h->th_hp != NULL)
 820                 h->th_hp(tsi);
 821         RETURN(0);
 822 }
 823 EXPORT_SYMBOL(tgt_hpreq_handler);
 824
 825 void tgt_counter_incr(struct obd_export *exp, int opcode)
 826 {
 827         lprocfs_counter_incr(exp->exp_obd->obd_stats, opcode);
 828         if (exp->exp_nid_stats && exp->exp_nid_stats->nid_stats != NULL)
 829                 lprocfs_counter_incr(exp->exp_nid_stats->nid_stats, opcode);
 830 }
 831 EXPORT_SYMBOL(tgt_counter_incr);
 832
 833 /*
 834  * Unified target generic handlers.
 835  */
 836
 837 int tgt_connect_check_sptlrpc(struct ptlrpc_request *req, struct obd_export *exp)
 838 {
 839         struct lu_target        *tgt = class_exp2tgt(exp);
 840         struct sptlrpc_flavor    flvr;
 841         int                      rc = 0;
 842
 843         LASSERT(tgt);
 844         LASSERT(tgt->lut_obd);
 845         LASSERT(tgt->lut_slice);
 846
 847         /* always allow ECHO client */
 848         if (unlikely(strcmp(exp->exp_obd->obd_type->typ_name,
 849                             LUSTRE_ECHO_NAME) == 0)) {
 850                 exp->exp_flvr.sf_rpc = SPTLRPC_FLVR_ANY;
 851                 return 0;
 852         }
 853
 854         if (exp->exp_flvr.sf_rpc == SPTLRPC_FLVR_INVALID) {
 855                 read_lock(&tgt->lut_sptlrpc_lock);
 856                 sptlrpc_target_choose_flavor(&tgt->lut_sptlrpc_rset,
 857                                              req->rq_sp_from,
 858                                              req->rq_peer.nid,
 859                                              &flvr);
 860                 read_unlock(&tgt->lut_sptlrpc_lock);
 861
 862                 spin_lock(&exp->exp_lock);
 863                 exp->exp_sp_peer = req->rq_sp_from;
 864                 exp->exp_flvr = flvr;
 865
 866                 /* when on mgs, if no restriction is set, or if client
 867                  * is loopback, allow any flavor */
 868                 if ((strcmp(exp->exp_obd->obd_type->typ_name,
 869                            LUSTRE_MGS_NAME) == 0) &&
 870                      (exp->exp_flvr.sf_rpc == SPTLRPC_FLVR_NULL ||
 871                       LNET_NETTYP(LNET_NIDNET(exp->exp_connection->c_peer.nid))
 872                       == LOLND))
 873                         exp->exp_flvr.sf_rpc = SPTLRPC_FLVR_ANY;
 874
 875                 if (exp->exp_flvr.sf_rpc != SPTLRPC_FLVR_ANY &&
 876                     exp->exp_flvr.sf_rpc != req->rq_flvr.sf_rpc) {
 877                         CERROR("%s: unauthorized rpc flavor %x from %s, "
 878                                "expect %x\n", tgt_name(tgt),
 879                                req->rq_flvr.sf_rpc,
 880                                libcfs_nid2str(req->rq_peer.nid),
 881                                exp->exp_flvr.sf_rpc);
 882                         rc = -EACCES;
 883                 }
 884                 spin_unlock(&exp->exp_lock);
 885         } else {
 886                 if (exp->exp_sp_peer != req->rq_sp_from) {
 887                         CERROR("%s: RPC source %s doesn't match %s\n",
 888                                tgt_name(tgt),
 889                                sptlrpc_part2name(req->rq_sp_from),
 890                                sptlrpc_part2name(exp->exp_sp_peer));
 891                         rc = -EACCES;
 892                 } else {
 893                         rc = sptlrpc_target_export_check(exp, req);
 894                 }
 895         }
 896
 897         return rc;
 898 }
 899
 900 int tgt_adapt_sptlrpc_conf(struct lu_target *tgt)
 901 {
 902         struct sptlrpc_rule_set  tmp_rset;
 903         int                      rc;
 904
 905         if (unlikely(tgt == NULL)) {
 906                 CERROR("No target passed");
 907                 return -EINVAL;
 908         }
 909
 910         sptlrpc_rule_set_init(&tmp_rset);
 911         rc = sptlrpc_conf_target_get_rules(tgt->lut_obd, &tmp_rset);
 912         if (rc) {
 913                 CERROR("%s: failed get sptlrpc rules: rc = %d\n",
 914                        tgt_name(tgt), rc);
 915                 return rc;
 916         }
 917
 918         sptlrpc_target_update_exp_flavor(tgt->lut_obd, &tmp_rset);
 919
 920         write_lock(&tgt->lut_sptlrpc_lock);
 921         sptlrpc_rule_set_free(&tgt->lut_sptlrpc_rset);
 922         tgt->lut_sptlrpc_rset = tmp_rset;
 923         write_unlock(&tgt->lut_sptlrpc_lock);
 924
 925         return 0;
 926 }
 927 EXPORT_SYMBOL(tgt_adapt_sptlrpc_conf);
 928
 929 int tgt_connect(struct tgt_session_info *tsi)
 930 {
 931         struct ptlrpc_request   *req = tgt_ses_req(tsi);
 932         struct obd_connect_data *reply;
 933         int                      rc;
 934
 935         ENTRY;
 936
 937         /* XXX: better to call this check right after getting new export but
 938          * before last_rcvd slot allocation to avoid server load upon insecure
 939          * connects. This is to be fixed after unifiyng all targets.
 940          */
 941         rc = tgt_connect_check_sptlrpc(req, tsi->tsi_exp);
 942         if (rc)
 943                 GOTO(out, rc);
 944
 945         /* To avoid exposing partially initialized connection flags, changes up
 946          * to this point have been staged in reply->ocd_connect_flags. Now that
 947          * connection handling has completed successfully, atomically update
 948          * the connect flags in the shared export data structure. LU-1623 */
 949         reply = req_capsule_server_get(tsi->tsi_pill, &RMF_CONNECT_DATA);
 950         spin_lock(&tsi->tsi_exp->exp_lock);
 951         *exp_connect_flags_ptr(tsi->tsi_exp) = reply->ocd_connect_flags;
 952         tsi->tsi_exp->exp_connect_data.ocd_brw_size = reply->ocd_brw_size;
 953         spin_unlock(&tsi->tsi_exp->exp_lock);
 954
 955         RETURN(0);
 956 out:
 957         obd_disconnect(class_export_get(tsi->tsi_exp));
 958         return rc;
 959 }
 960 EXPORT_SYMBOL(tgt_connect);
 961
 962 int tgt_disconnect(struct tgt_session_info *tsi)
 963 {
 964         int rc;
 965
 966         ENTRY;
 967
 968         rc = target_handle_disconnect(tgt_ses_req(tsi));
 969         if (rc)
 970                 RETURN(err_serious(rc));
 971
 972         RETURN(rc);
 973 }
 974 EXPORT_SYMBOL(tgt_disconnect);
 975
 976 /*
 977  * Unified target OBD handlers
 978  */
 979 int tgt_obd_ping(struct tgt_session_info *tsi)
 980 {
 981         int rc;
 982
 983         ENTRY;
 984
 985         rc = target_handle_ping(tgt_ses_req(tsi));
 986         if (rc)
 987                 RETURN(err_serious(rc));
 988
 989         RETURN(rc);
 990 }
 991 EXPORT_SYMBOL(tgt_obd_ping);
 992
 993 int tgt_obd_log_cancel(struct tgt_session_info *tsi)
 994 {
 995         return err_serious(-EOPNOTSUPP);
 996 }
 997
 998 int tgt_send_buffer(struct tgt_session_info *tsi, struct lu_rdbuf *rdbuf)
 999 {
1000         struct tgt_thread_info  *tti = tgt_th_info(tsi->tsi_env);
1001         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1002         struct obd_export       *exp = req->rq_export;
1003         struct ptlrpc_bulk_desc *desc;
1004         struct l_wait_info      *lwi = &tti->tti_u.update.tti_wait_info;
1005         int                      i;
1006         int                      rc;
1007
1008         ENTRY;
1009
1010         desc = ptlrpc_prep_bulk_exp(req, rdbuf->rb_nbufs, 1,
1011                                   PTLRPC_BULK_PUT_SOURCE | PTLRPC_BULK_BUF_KVEC,
1012                                     MDS_BULK_PORTAL, &ptlrpc_bulk_kvec_ops);
1013         if (desc == NULL)
1014                 RETURN(-ENOMEM);
1015
1016         for (i = 0; i < rdbuf->rb_nbufs; i++)
1017                 desc->bd_frag_ops->add_iov_frag(desc,
1018                                         rdbuf->rb_bufs[i].lb_buf,
1019                                         rdbuf->rb_bufs[i].lb_len);
1020
1021         rc = target_bulk_io(exp, desc, lwi);
1022         ptlrpc_free_bulk(desc);
1023         RETURN(rc);
1024 }
1025 EXPORT_SYMBOL(tgt_send_buffer);
1026
1027 int tgt_sendpage(struct tgt_session_info *tsi, struct lu_rdpg *rdpg, int nob)
1028 {
1029         struct tgt_thread_info  *tti = tgt_th_info(tsi->tsi_env);
1030         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1031         struct obd_export       *exp = req->rq_export;
1032         struct ptlrpc_bulk_desc *desc;
1033         struct l_wait_info      *lwi = &tti->tti_u.rdpg.tti_wait_info;
1034         int                      tmpcount;
1035         int                      tmpsize;
1036         int                      i;
1037         int                      rc;
1038
1039         ENTRY;
1040
1041         desc = ptlrpc_prep_bulk_exp(req, rdpg->rp_npages, 1,
1042                                     PTLRPC_BULK_PUT_SOURCE |
1043                                         PTLRPC_BULK_BUF_KIOV,
1044                                     MDS_BULK_PORTAL,
1045                                     &ptlrpc_bulk_kiov_pin_ops);
1046         if (desc == NULL)
1047                 RETURN(-ENOMEM);
1048
1049         if (!(exp_connect_flags(exp) & OBD_CONNECT_BRW_SIZE))
1050                 /* old client requires reply size in it's PAGE_SIZE,
1051                  * which is rdpg->rp_count */
1052                 nob = rdpg->rp_count;
1053
1054         for (i = 0, tmpcount = nob; i < rdpg->rp_npages && tmpcount > 0;
1055              i++, tmpcount -= tmpsize) {
1056                 tmpsize = min_t(int, tmpcount, PAGE_SIZE);
1057                 desc->bd_frag_ops->add_kiov_frag(desc, rdpg->rp_pages[i], 0,
1058                                                  tmpsize);
1059         }
1060
1061         LASSERT(desc->bd_nob == nob);
1062         rc = target_bulk_io(exp, desc, lwi);
1063         ptlrpc_free_bulk(desc);
1064         RETURN(rc);
1065 }
1066 EXPORT_SYMBOL(tgt_sendpage);
1067
1068 /*
1069  * OBD_IDX_READ handler
1070  */
1071 static int tgt_obd_idx_read(struct tgt_session_info *tsi)
1072 {
1073         struct tgt_thread_info  *tti = tgt_th_info(tsi->tsi_env);
1074         struct lu_rdpg          *rdpg = &tti->tti_u.rdpg.tti_rdpg;
1075         struct idx_info         *req_ii, *rep_ii;
1076         int                      rc, i;
1077
1078         ENTRY;
1079
1080         memset(rdpg, 0, sizeof(*rdpg));
1081         req_capsule_set(tsi->tsi_pill, &RQF_OBD_IDX_READ);
1082
1083         /* extract idx_info buffer from request & reply */
1084         req_ii = req_capsule_client_get(tsi->tsi_pill, &RMF_IDX_INFO);
1085         if (req_ii == NULL || req_ii->ii_magic != IDX_INFO_MAGIC)
1086                 RETURN(err_serious(-EPROTO));
1087
1088         rc = req_capsule_server_pack(tsi->tsi_pill);
1089         if (rc)
1090                 RETURN(err_serious(rc));
1091
1092         rep_ii = req_capsule_server_get(tsi->tsi_pill, &RMF_IDX_INFO);
1093         if (rep_ii == NULL)
1094                 RETURN(err_serious(-EFAULT));
1095         rep_ii->ii_magic = IDX_INFO_MAGIC;
1096
1097         /* extract hash to start with */
1098         rdpg->rp_hash = req_ii->ii_hash_start;
1099
1100         /* extract requested attributes */
1101         rdpg->rp_attrs = req_ii->ii_attrs;
1102
1103         /* check that fid packed in request is valid and supported */
1104         if (!fid_is_sane(&req_ii->ii_fid))
1105                 RETURN(-EINVAL);
1106         rep_ii->ii_fid = req_ii->ii_fid;
1107
1108         /* copy flags */
1109         rep_ii->ii_flags = req_ii->ii_flags;
1110
1111         /* compute number of pages to allocate, ii_count is the number of 4KB
1112          * containers */
1113         if (req_ii->ii_count <= 0)
1114                 GOTO(out, rc = -EFAULT);
1115         rdpg->rp_count = min_t(unsigned int, req_ii->ii_count << LU_PAGE_SHIFT,
1116                                exp_max_brw_size(tsi->tsi_exp));
1117         rdpg->rp_npages = (rdpg->rp_count + PAGE_SIZE - 1) >> PAGE_SHIFT;
1118
1119         /* allocate pages to store the containers */
1120         OBD_ALLOC(rdpg->rp_pages, rdpg->rp_npages * sizeof(rdpg->rp_pages[0]));
1121         if (rdpg->rp_pages == NULL)
1122                 GOTO(out, rc = -ENOMEM);
1123         for (i = 0; i < rdpg->rp_npages; i++) {
1124                 rdpg->rp_pages[i] = alloc_page(GFP_NOFS);
1125                 if (rdpg->rp_pages[i] == NULL)
1126                         GOTO(out, rc = -ENOMEM);
1127         }
1128
1129         /* populate pages with key/record pairs */
1130         rc = dt_index_read(tsi->tsi_env, tsi->tsi_tgt->lut_bottom, rep_ii, rdpg);
1131         if (rc < 0)
1132                 GOTO(out, rc);
1133
1134         LASSERTF(rc <= rdpg->rp_count, "dt_index_read() returned more than "
1135                  "asked %d > %d\n", rc, rdpg->rp_count);
1136
1137         /* send pages to client */
1138         rc = tgt_sendpage(tsi, rdpg, rc);
1139         if (rc)
1140                 GOTO(out, rc);
1141         EXIT;
1142 out:
1143         if (rdpg->rp_pages) {
1144                 for (i = 0; i < rdpg->rp_npages; i++)
1145                         if (rdpg->rp_pages[i])
1146                                 __free_page(rdpg->rp_pages[i]);
1147                 OBD_FREE(rdpg->rp_pages,
1148                          rdpg->rp_npages * sizeof(rdpg->rp_pages[0]));
1149         }
1150         return rc;
1151 }
1152
1153 struct tgt_handler tgt_obd_handlers[] = {
1154 TGT_OBD_HDL    (0,      OBD_PING,               tgt_obd_ping),
1155 TGT_OBD_HDL_VAR(0,      OBD_LOG_CANCEL,         tgt_obd_log_cancel),
1156 TGT_OBD_HDL    (0,      OBD_IDX_READ,           tgt_obd_idx_read)
1157 };
1158 EXPORT_SYMBOL(tgt_obd_handlers);
1159
1160 int tgt_sync(const struct lu_env *env, struct lu_target *tgt,
1161              struct dt_object *obj, __u64 start, __u64 end)
1162 {
1163         int rc = 0;
1164
1165         ENTRY;
1166
1167         /* if no objid is specified, it means "sync whole filesystem" */
1168         if (obj == NULL) {
1169                 rc = dt_sync(env, tgt->lut_bottom);
1170         } else if (dt_version_get(env, obj) >
1171                    tgt->lut_obd->obd_last_committed) {
1172                 rc = dt_object_sync(env, obj, start, end);
1173         }
1174         atomic_inc(&tgt->lut_sync_count);
1175
1176         RETURN(rc);
1177 }
1178 EXPORT_SYMBOL(tgt_sync);
1179 /*
1180  * Unified target DLM handlers.
1181  */
1182
1183 /**
1184  * Unified target BAST
1185  *
1186  * Ensure data and metadata are synced to disk when lock is canceled if Sync on
1187  * Cancel (SOC) is enabled. If it's extent lock, normally sync obj is enough,
1188  * but if it's cross-MDT lock, because remote object version is not set, a
1189  * filesystem sync is needed.
1190  *
1191  * \param lock server side lock
1192  * \param desc lock desc
1193  * \param data ldlm_cb_set_arg
1194  * \param flag  indicates whether this cancelling or blocking callback
1195  * \retval      0 on success
1196  * \retval      negative number on error
1197  */
1198 static int tgt_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
1199                             void *data, int flag)
1200 {
1201         struct lu_env            env;
1202         struct lu_target        *tgt;
1203         struct dt_object        *obj = NULL;
1204         struct lu_fid            fid;
1205         int                      rc = 0;
1206
1207         ENTRY;
1208
1209         tgt = class_exp2tgt(lock->l_export);
1210
1211         if (unlikely(tgt == NULL)) {
1212                 CDEBUG(D_ERROR, "%s: No target for connected export\n",
1213                        class_exp2obd(lock->l_export)->obd_name);
1214                 RETURN(-EINVAL);
1215         }
1216
1217         if (flag == LDLM_CB_CANCELING &&
1218             (lock->l_granted_mode & (LCK_EX | LCK_PW | LCK_GROUP)) &&
1219             (tgt->lut_sync_lock_cancel == ALWAYS_SYNC_ON_CANCEL ||
1220              (tgt->lut_sync_lock_cancel == BLOCKING_SYNC_ON_CANCEL &&
1221               ldlm_is_cbpending(lock))) &&
1222             ((exp_connect_flags(lock->l_export) & OBD_CONNECT_MDS_MDS) ||
1223              lock->l_resource->lr_type == LDLM_EXTENT)) {
1224                 __u64 start = 0;
1225                 __u64 end = OBD_OBJECT_EOF;
1226
1227                 rc = lu_env_init(&env, LCT_DT_THREAD);
1228                 if (unlikely(rc != 0))
1229                         RETURN(rc);
1230
1231                 ost_fid_from_resid(&fid, &lock->l_resource->lr_name,
1232                                    tgt->lut_lsd.lsd_osd_index);
1233
1234                 if (lock->l_resource->lr_type == LDLM_EXTENT) {
1235                         obj = dt_locate(&env, tgt->lut_bottom, &fid);
1236                         if (IS_ERR(obj))
1237                                 GOTO(err_env, rc = PTR_ERR(obj));
1238
1239                         if (!dt_object_exists(obj))
1240                                 GOTO(err_put, rc = -ENOENT);
1241
1242                         start = lock->l_policy_data.l_extent.start;
1243                         end = lock->l_policy_data.l_extent.end;
1244                 }
1245
1246                 rc = tgt_sync(&env, tgt, obj, start, end);
1247                 if (rc < 0) {
1248                         CERROR("%s: syncing "DFID" (%llu-%llu) on lock "
1249                                "cancel: rc = %d\n",
1250                                tgt_name(tgt), PFID(&fid),
1251                                lock->l_policy_data.l_extent.start,
1252                                lock->l_policy_data.l_extent.end, rc);
1253                 }
1254 err_put:
1255                 if (obj != NULL)
1256                         dt_object_put(&env, obj);
1257 err_env:
1258                 lu_env_fini(&env);
1259         }
1260
1261         rc = ldlm_server_blocking_ast(lock, desc, data, flag);
1262         RETURN(rc);
1263 }
1264
1265 static struct ldlm_callback_suite tgt_dlm_cbs = {
1266         .lcs_completion = ldlm_server_completion_ast,
1267         .lcs_blocking   = tgt_blocking_ast,
1268         .lcs_glimpse    = ldlm_server_glimpse_ast
1269 };
1270
1271 int tgt_enqueue(struct tgt_session_info *tsi)
1272 {
1273         struct ptlrpc_request *req = tgt_ses_req(tsi);
1274         int rc;
1275
1276         ENTRY;
1277         /*
1278          * tsi->tsi_dlm_req was already swapped and (if necessary) converted,
1279          * tsi->tsi_dlm_cbs was set by the *_req_handle() function.
1280          */
1281         LASSERT(tsi->tsi_dlm_req != NULL);
1282         rc = ldlm_handle_enqueue0(tsi->tsi_exp->exp_obd->obd_namespace, req,
1283                                   tsi->tsi_dlm_req, &tgt_dlm_cbs);
1284         if (rc)
1285                 RETURN(err_serious(rc));
1286
1287         switch (LUT_FAIL_CLASS(tsi->tsi_reply_fail_id)) {
1288         case LUT_FAIL_MDT:
1289                 tsi->tsi_reply_fail_id = OBD_FAIL_MDS_LDLM_REPLY_NET;
1290                 break;
1291         case LUT_FAIL_OST:
1292                 tsi->tsi_reply_fail_id = OBD_FAIL_OST_LDLM_REPLY_NET;
1293                 break;
1294         case LUT_FAIL_MGT:
1295                 tsi->tsi_reply_fail_id = OBD_FAIL_MGS_LDLM_REPLY_NET;
1296                 break;
1297         default:
1298                 tsi->tsi_reply_fail_id = OBD_FAIL_LDLM_REPLY;
1299                 break;
1300         }
1301         RETURN(req->rq_status);
1302 }
1303 EXPORT_SYMBOL(tgt_enqueue);
1304
1305 int tgt_convert(struct tgt_session_info *tsi)
1306 {
1307         struct ptlrpc_request *req = tgt_ses_req(tsi);
1308         int rc;
1309
1310         ENTRY;
1311         LASSERT(tsi->tsi_dlm_req);
1312         rc = ldlm_handle_convert0(req, tsi->tsi_dlm_req);
1313         if (rc)
1314                 RETURN(err_serious(rc));
1315
1316         RETURN(req->rq_status);
1317 }
1318
1319 int tgt_bl_callback(struct tgt_session_info *tsi)
1320 {
1321         return err_serious(-EOPNOTSUPP);
1322 }
1323
1324 int tgt_cp_callback(struct tgt_session_info *tsi)
1325 {
1326         return err_serious(-EOPNOTSUPP);
1327 }
1328
1329 /* generic LDLM target handler */
1330 struct tgt_handler tgt_dlm_handlers[] = {
1331 TGT_DLM_HDL    (HABEO_CLAVIS,   LDLM_ENQUEUE,           tgt_enqueue),
1332 TGT_DLM_HDL_VAR(HABEO_CLAVIS,   LDLM_CONVERT,           tgt_convert),
1333 TGT_DLM_HDL_VAR(0,              LDLM_BL_CALLBACK,       tgt_bl_callback),
1334 TGT_DLM_HDL_VAR(0,              LDLM_CP_CALLBACK,       tgt_cp_callback)
1335 };
1336 EXPORT_SYMBOL(tgt_dlm_handlers);
1337
1338 /*
1339  * Unified target LLOG handlers.
1340  */
1341 int tgt_llog_open(struct tgt_session_info *tsi)
1342 {
1343         int rc;
1344
1345         ENTRY;
1346
1347         rc = llog_origin_handle_open(tgt_ses_req(tsi));
1348
1349         RETURN(rc);
1350 }
1351 EXPORT_SYMBOL(tgt_llog_open);
1352
1353 int tgt_llog_close(struct tgt_session_info *tsi)
1354 {
1355         int rc;
1356
1357         ENTRY;
1358
1359         rc = llog_origin_handle_close(tgt_ses_req(tsi));
1360
1361         RETURN(rc);
1362 }
1363 EXPORT_SYMBOL(tgt_llog_close);
1364
1365
1366 int tgt_llog_destroy(struct tgt_session_info *tsi)
1367 {
1368         int rc;
1369
1370         ENTRY;
1371
1372         rc = llog_origin_handle_destroy(tgt_ses_req(tsi));
1373
1374         RETURN(rc);
1375 }
1376
1377 int tgt_llog_read_header(struct tgt_session_info *tsi)
1378 {
1379         int rc;
1380
1381         ENTRY;
1382
1383         rc = llog_origin_handle_read_header(tgt_ses_req(tsi));
1384
1385         RETURN(rc);
1386 }
1387 EXPORT_SYMBOL(tgt_llog_read_header);
1388
1389 int tgt_llog_next_block(struct tgt_session_info *tsi)
1390 {
1391         int rc;
1392
1393         ENTRY;
1394
1395         rc = llog_origin_handle_next_block(tgt_ses_req(tsi));
1396
1397         RETURN(rc);
1398 }
1399 EXPORT_SYMBOL(tgt_llog_next_block);
1400
1401 int tgt_llog_prev_block(struct tgt_session_info *tsi)
1402 {
1403         int rc;
1404
1405         ENTRY;
1406
1407         rc = llog_origin_handle_prev_block(tgt_ses_req(tsi));
1408
1409         RETURN(rc);
1410 }
1411 EXPORT_SYMBOL(tgt_llog_prev_block);
1412
1413 /* generic llog target handler */
1414 struct tgt_handler tgt_llog_handlers[] = {
1415 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_CREATE,      tgt_llog_open),
1416 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_NEXT_BLOCK,  tgt_llog_next_block),
1417 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_READ_HEADER, tgt_llog_read_header),
1418 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_PREV_BLOCK,  tgt_llog_prev_block),
1419 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_DESTROY,     tgt_llog_destroy),
1420 TGT_LLOG_HDL_VAR(0,     LLOG_ORIGIN_HANDLE_CLOSE,       tgt_llog_close),
1421 };
1422 EXPORT_SYMBOL(tgt_llog_handlers);
1423
1424 /*
1425  * sec context handlers
1426  */
1427 /* XXX: Implement based on mdt_sec_ctx_handle()? */
1428 static int tgt_sec_ctx_handle(struct tgt_session_info *tsi)
1429 {
1430         return 0;
1431 }
1432
1433 struct tgt_handler tgt_sec_ctx_handlers[] = {
1434 TGT_SEC_HDL_VAR(0,      SEC_CTX_INIT,           tgt_sec_ctx_handle),
1435 TGT_SEC_HDL_VAR(0,      SEC_CTX_INIT_CONT,      tgt_sec_ctx_handle),
1436 TGT_SEC_HDL_VAR(0,      SEC_CTX_FINI,           tgt_sec_ctx_handle),
1437 };
1438 EXPORT_SYMBOL(tgt_sec_ctx_handlers);
1439
1440 int (*tgt_lfsck_in_notify_local)(const struct lu_env *env,
1441                                  struct dt_device *key,
1442                                  struct lfsck_req_local *lrl,
1443                                  struct thandle *th) = NULL;
1444
1445 void tgt_register_lfsck_in_notify_local(int (*notify)(const struct lu_env *,
1446                                                       struct dt_device *,
1447                                                       struct lfsck_req_local *,
1448                                                       struct thandle *))
1449 {
1450         tgt_lfsck_in_notify_local = notify;
1451 }
1452 EXPORT_SYMBOL(tgt_register_lfsck_in_notify_local);
1453
1454 int (*tgt_lfsck_in_notify)(const struct lu_env *env,
1455                            struct dt_device *key,
1456                            struct lfsck_request *lr) = NULL;
1457
1458 void tgt_register_lfsck_in_notify(int (*notify)(const struct lu_env *,
1459                                                 struct dt_device *,
1460                                                 struct lfsck_request *))
1461 {
1462         tgt_lfsck_in_notify = notify;
1463 }
1464 EXPORT_SYMBOL(tgt_register_lfsck_in_notify);
1465
1466 static int (*tgt_lfsck_query)(const struct lu_env *env,
1467                               struct dt_device *key,
1468                               struct lfsck_request *req,
1469                               struct lfsck_reply *rep,
1470                               struct lfsck_query *que) = NULL;
1471
1472 void tgt_register_lfsck_query(int (*query)(const struct lu_env *,
1473                                            struct dt_device *,
1474                                            struct lfsck_request *,
1475                                            struct lfsck_reply *,
1476                                            struct lfsck_query *))
1477 {
1478         tgt_lfsck_query = query;
1479 }
1480 EXPORT_SYMBOL(tgt_register_lfsck_query);
1481
1482 /* LFSCK request handlers */
1483 static int tgt_handle_lfsck_notify(struct tgt_session_info *tsi)
1484 {
1485         const struct lu_env     *env = tsi->tsi_env;
1486         struct dt_device        *key = tsi->tsi_tgt->lut_bottom;
1487         struct lfsck_request    *lr;
1488         int                      rc;
1489         ENTRY;
1490
1491         lr = req_capsule_client_get(tsi->tsi_pill, &RMF_LFSCK_REQUEST);
1492         if (lr == NULL)
1493                 RETURN(-EPROTO);
1494
1495         rc = tgt_lfsck_in_notify(env, key, lr);
1496
1497         RETURN(rc);
1498 }
1499
1500 static int tgt_handle_lfsck_query(struct tgt_session_info *tsi)
1501 {
1502         struct lfsck_request    *request;
1503         struct lfsck_reply      *reply;
1504         int                      rc;
1505         ENTRY;
1506
1507         request = req_capsule_client_get(tsi->tsi_pill, &RMF_LFSCK_REQUEST);
1508         if (request == NULL)
1509                 RETURN(-EPROTO);
1510
1511         reply = req_capsule_server_get(tsi->tsi_pill, &RMF_LFSCK_REPLY);
1512         if (reply == NULL)
1513                 RETURN(-ENOMEM);
1514
1515         rc = tgt_lfsck_query(tsi->tsi_env, tsi->tsi_tgt->lut_bottom,
1516                              request, reply, NULL);
1517
1518         RETURN(rc < 0 ? rc : 0);
1519 }
1520
1521 struct tgt_handler tgt_lfsck_handlers[] = {
1522 TGT_LFSCK_HDL(HABEO_REFERO,     LFSCK_NOTIFY,   tgt_handle_lfsck_notify),
1523 TGT_LFSCK_HDL(HABEO_REFERO,     LFSCK_QUERY,    tgt_handle_lfsck_query),
1524 };
1525 EXPORT_SYMBOL(tgt_lfsck_handlers);
1526
1527 /*
1528  * initialize per-thread page pool (bug 5137).
1529  */
1530 int tgt_io_thread_init(struct ptlrpc_thread *thread)
1531 {
1532         struct tgt_thread_big_cache *tbc;
1533
1534         ENTRY;
1535
1536         LASSERT(thread != NULL);
1537         LASSERT(thread->t_data == NULL);
1538
1539         OBD_ALLOC_LARGE(tbc, sizeof(*tbc));
1540         if (tbc == NULL)
1541                 RETURN(-ENOMEM);
1542         thread->t_data = tbc;
1543         RETURN(0);
1544 }
1545 EXPORT_SYMBOL(tgt_io_thread_init);
1546
1547 /*
1548  * free per-thread pool created by tgt_thread_init().
1549  */
1550 void tgt_io_thread_done(struct ptlrpc_thread *thread)
1551 {
1552         struct tgt_thread_big_cache *tbc;
1553
1554         ENTRY;
1555
1556         LASSERT(thread != NULL);
1557
1558         /*
1559          * be prepared to handle partially-initialized pools (because this is
1560          * called from ost_io_thread_init() for cleanup.
1561          */
1562         tbc = thread->t_data;
1563         if (tbc != NULL) {
1564                 OBD_FREE_LARGE(tbc, sizeof(*tbc));
1565                 thread->t_data = NULL;
1566         }
1567         EXIT;
1568 }
1569 EXPORT_SYMBOL(tgt_io_thread_done);
1570 /**
1571  * Helper function for getting server side [start, start+count] DLM lock
1572  * if asked by client.
1573  */
1574 int tgt_extent_lock(struct ldlm_namespace *ns, struct ldlm_res_id *res_id,
1575                     __u64 start, __u64 end, struct lustre_handle *lh,
1576                     int mode, __u64 *flags)
1577 {
1578         union ldlm_policy_data policy;
1579         int rc;
1580
1581         ENTRY;
1582
1583         LASSERT(lh != NULL);
1584         LASSERT(ns != NULL);
1585         LASSERT(!lustre_handle_is_used(lh));
1586
1587         policy.l_extent.gid = 0;
1588         policy.l_extent.start = start & PAGE_MASK;
1589
1590         /*
1591          * If ->o_blocks is EOF it means "lock till the end of the file".
1592          * Otherwise, it's size of an extent or hole being punched (in bytes).
1593          */
1594         if (end == OBD_OBJECT_EOF || end < start)
1595                 policy.l_extent.end = OBD_OBJECT_EOF;
1596         else
1597                 policy.l_extent.end = end | ~PAGE_MASK;
1598
1599         rc = ldlm_cli_enqueue_local(ns, res_id, LDLM_EXTENT, &policy, mode,
1600                                     flags, ldlm_blocking_ast,
1601                                     ldlm_completion_ast, ldlm_glimpse_ast,
1602                                     NULL, 0, LVB_T_NONE, NULL, lh);
1603         RETURN(rc == ELDLM_OK ? 0 : -EIO);
1604 }
1605 EXPORT_SYMBOL(tgt_extent_lock);
1606
1607 void tgt_extent_unlock(struct lustre_handle *lh, enum ldlm_mode mode)
1608 {
1609         LASSERT(lustre_handle_is_used(lh));
1610         ldlm_lock_decref(lh, mode);
1611 }
1612 EXPORT_SYMBOL(tgt_extent_unlock);
1613
1614 int tgt_brw_lock(struct ldlm_namespace *ns, struct ldlm_res_id *res_id,
1615                  struct obd_ioobj *obj, struct niobuf_remote *nb,
1616                  struct lustre_handle *lh, enum ldlm_mode mode)
1617 {
1618         __u64                    flags = 0;
1619         int                      nrbufs = obj->ioo_bufcnt;
1620         int                      i;
1621
1622         ENTRY;
1623
1624         LASSERT(mode == LCK_PR || mode == LCK_PW);
1625         LASSERT(!lustre_handle_is_used(lh));
1626
1627         if (ns->ns_obd->obd_recovering)
1628                 RETURN(0);
1629
1630         if (nrbufs == 0 || !(nb[0].rnb_flags & OBD_BRW_SRVLOCK))
1631                 RETURN(0);
1632
1633         for (i = 1; i < nrbufs; i++)
1634                 if (!(nb[i].rnb_flags & OBD_BRW_SRVLOCK))
1635                         RETURN(-EFAULT);
1636
1637         RETURN(tgt_extent_lock(ns, res_id, nb[0].rnb_offset,
1638                                nb[nrbufs - 1].rnb_offset +
1639                                nb[nrbufs - 1].rnb_len - 1,
1640                                lh, mode, &flags));
1641 }
1642
1643 void tgt_brw_unlock(struct obd_ioobj *obj, struct niobuf_remote *niob,
1644                     struct lustre_handle *lh, enum ldlm_mode mode)
1645 {
1646         ENTRY;
1647
1648         LASSERT(mode == LCK_PR || mode == LCK_PW);
1649         LASSERT((obj->ioo_bufcnt > 0 &&
1650                  (niob[0].rnb_flags & OBD_BRW_SRVLOCK)) ==
1651                 lustre_handle_is_used(lh));
1652
1653         if (lustre_handle_is_used(lh))
1654                 tgt_extent_unlock(lh, mode);
1655         EXIT;
1656 }
1657
1658 static __u32 tgt_checksum_bulk(struct lu_target *tgt,
1659                                struct ptlrpc_bulk_desc *desc, int opc,
1660                                cksum_type_t cksum_type)
1661 {
1662         struct cfs_crypto_hash_desc     *hdesc;
1663         unsigned int                    bufsize;
1664         int                             i, err;
1665         unsigned char                   cfs_alg = cksum_obd2cfs(cksum_type);
1666         __u32                           cksum;
1667
1668         LASSERT(ptlrpc_is_bulk_desc_kiov(desc->bd_type));
1669
1670         hdesc = cfs_crypto_hash_init(cfs_alg, NULL, 0);
1671         if (IS_ERR(hdesc)) {
1672                 CERROR("%s: unable to initialize checksum hash %s\n",
1673                        tgt_name(tgt), cfs_crypto_hash_name(cfs_alg));
1674                 return PTR_ERR(hdesc);
1675         }
1676
1677         CDEBUG(D_INFO, "Checksum for algo %s\n", cfs_crypto_hash_name(cfs_alg));
1678         for (i = 0; i < desc->bd_iov_count; i++) {
1679                 /* corrupt the data before we compute the checksum, to
1680                  * simulate a client->OST data error */
1681                 if (i == 0 && opc == OST_WRITE &&
1682                     OBD_FAIL_CHECK(OBD_FAIL_OST_CHECKSUM_RECEIVE)) {
1683                         int off = BD_GET_KIOV(desc, i).kiov_offset &
1684                                 ~PAGE_MASK;
1685                         int len = BD_GET_KIOV(desc, i).kiov_len;
1686                         struct page *np = tgt_page_to_corrupt;
1687                         char *ptr = kmap(BD_GET_KIOV(desc, i).kiov_page) + off;
1688
1689                         if (np) {
1690                                 char *ptr2 = kmap(np) + off;
1691
1692                                 memcpy(ptr2, ptr, len);
1693                                 memcpy(ptr2, "bad3", min(4, len));
1694                                 kunmap(np);
1695
1696                                 /* LU-8376 to preserve original index for
1697                                  * display in dump_all_bulk_pages() */
1698                                 np->index = BD_GET_KIOV(desc,
1699                                                         i).kiov_page->index;
1700
1701                                 BD_GET_KIOV(desc, i).kiov_page = np;
1702                         } else {
1703                                 CERROR("%s: can't alloc page for corruption\n",
1704                                        tgt_name(tgt));
1705                         }
1706                 }
1707                 cfs_crypto_hash_update_page(hdesc,
1708                                   BD_GET_KIOV(desc, i).kiov_page,
1709                                   BD_GET_KIOV(desc, i).kiov_offset &
1710                                         ~PAGE_MASK,
1711                                   BD_GET_KIOV(desc, i).kiov_len);
1712
1713                  /* corrupt the data after we compute the checksum, to
1714                  * simulate an OST->client data error */
1715                 if (i == 0 && opc == OST_READ &&
1716                     OBD_FAIL_CHECK(OBD_FAIL_OST_CHECKSUM_SEND)) {
1717                         int off = BD_GET_KIOV(desc, i).kiov_offset
1718                           & ~PAGE_MASK;
1719                         int len = BD_GET_KIOV(desc, i).kiov_len;
1720                         struct page *np = tgt_page_to_corrupt;
1721                         char *ptr =
1722                           kmap(BD_GET_KIOV(desc, i).kiov_page) + off;
1723
1724                         if (np) {
1725                                 char *ptr2 = kmap(np) + off;
1726
1727                                 memcpy(ptr2, ptr, len);
1728                                 memcpy(ptr2, "bad4", min(4, len));
1729                                 kunmap(np);
1730
1731                                 /* LU-8376 to preserve original index for
1732                                  * display in dump_all_bulk_pages() */
1733                                 np->index = BD_GET_KIOV(desc,
1734                                                         i).kiov_page->index;
1735
1736                                 BD_GET_KIOV(desc, i).kiov_page = np;
1737                         } else {
1738                                 CERROR("%s: can't alloc page for corruption\n",
1739                                        tgt_name(tgt));
1740                         }
1741                 }
1742         }
1743
1744         bufsize = sizeof(cksum);
1745         err = cfs_crypto_hash_final(hdesc, (unsigned char *)&cksum, &bufsize);
1746
1747         return cksum;
1748 }
1749
1750 char dbgcksum_file_name[PATH_MAX];
1751
1752 static void dump_all_bulk_pages(struct obdo *oa, int count,
1753                                     lnet_kiov_t *iov, __u32 server_cksum,
1754                                     __u32 client_cksum)
1755 {
1756         struct file *filp;
1757         int rc, i;
1758         unsigned int len;
1759         char *buf;
1760         mm_segment_t oldfs;
1761
1762         /* will only keep dump of pages on first error for the same range in
1763          * file/fid, not during the resends/retries. */
1764         snprintf(dbgcksum_file_name, sizeof(dbgcksum_file_name),
1765                  "%s-checksum_dump-ost-"DFID":[%llu-%llu]-%x-%x",
1766                  (strncmp(libcfs_debug_file_path_arr, "NONE", 4) != 0 ?
1767                   libcfs_debug_file_path_arr :
1768                   LIBCFS_DEBUG_FILE_PATH_DEFAULT),
1769                  oa->o_valid & OBD_MD_FLFID ? oa->o_parent_seq : (__u64)0,
1770                  oa->o_valid & OBD_MD_FLFID ? oa->o_parent_oid : 0,
1771                  oa->o_valid & OBD_MD_FLFID ? oa->o_parent_ver : 0,
1772                  (__u64)iov[0].kiov_page->index << PAGE_SHIFT,
1773                  ((__u64)iov[count - 1].kiov_page->index << PAGE_SHIFT) +
1774                  iov[count - 1].kiov_len - 1, client_cksum, server_cksum);
1775         filp = filp_open(dbgcksum_file_name,
1776                          O_CREAT | O_EXCL | O_WRONLY | O_LARGEFILE, 0600);
1777         if (IS_ERR(filp)) {
1778                 rc = PTR_ERR(filp);
1779                 if (rc == -EEXIST)
1780                         CDEBUG(D_INFO, "%s: can't open to dump pages with "
1781                                "checksum error: rc = %d\n", dbgcksum_file_name,
1782                                rc);
1783                 else
1784                         CERROR("%s: can't open to dump pages with checksum "
1785                                "error: rc = %d\n", dbgcksum_file_name, rc);
1786                 return;
1787         }
1788
1789         oldfs = get_fs();
1790         set_fs(KERNEL_DS);
1791         for (i = 0; i < count; i++) {
1792                 len = iov[i].kiov_len;
1793                 buf = kmap(iov[i].kiov_page);
1794                 while (len != 0) {
1795                         rc = vfs_write(filp, (__force const char __user *)buf,
1796                                        len, &filp->f_pos);
1797                         if (rc < 0) {
1798                                 CERROR("%s: wanted to write %u but got %d "
1799                                        "error\n", dbgcksum_file_name, len, rc);
1800                                 break;
1801                         }
1802                         len -= rc;
1803                         buf += rc;
1804                         CDEBUG(D_INFO, "%s: wrote %d bytes\n",
1805                                dbgcksum_file_name, rc);
1806                 }
1807                 kunmap(iov[i].kiov_page);
1808         }
1809         set_fs(oldfs);
1810
1811         rc = ll_vfs_fsync_range(filp, 0, LLONG_MAX, 1);
1812         if (rc)
1813                 CERROR("%s: sync returns %d\n", dbgcksum_file_name, rc);
1814         filp_close(filp, NULL);
1815         return;
1816 }
1817
1818 static int check_read_checksum(struct ptlrpc_bulk_desc *desc, struct obdo *oa,
1819                                const lnet_process_id_t *peer,
1820                                __u32 client_cksum, __u32 server_cksum,
1821                                cksum_type_t server_cksum_type)
1822 {
1823         char *msg;
1824         cksum_type_t cksum_type;
1825
1826         /* unlikely to happen and only if resend does not occur due to cksum
1827          * control failure on Client */
1828         if (unlikely(server_cksum == client_cksum)) {
1829                 CDEBUG(D_PAGE, "checksum %x confirmed upon retry\n",
1830                        client_cksum);
1831                 return 0;
1832         }
1833
1834         if (desc->bd_export->exp_obd->obd_checksum_dump)
1835                 dump_all_bulk_pages(oa, desc->bd_iov_count,
1836                                     &BD_GET_KIOV(desc, 0), server_cksum,
1837                                     client_cksum);
1838
1839         cksum_type = cksum_type_unpack(oa->o_valid & OBD_MD_FLFLAGS ?
1840                                        oa->o_flags : 0);
1841
1842         if (cksum_type != server_cksum_type)
1843                 msg = "the server may have not used the checksum type specified"
1844                       " in the original request - likely a protocol problem";
1845         else
1846                 msg = "should have changed on the client or in transit";
1847
1848         LCONSOLE_ERROR_MSG(0x132, "%s: BAD READ CHECKSUM: %s: from %s inode "
1849                 DFID " object "DOSTID" extent [%llu-%llu], client returned csum"
1850                 " %x (type %x), server csum %x (type %x)\n",
1851                 desc->bd_export->exp_obd->obd_name,
1852                 msg, libcfs_nid2str(peer->nid),
1853                 oa->o_valid & OBD_MD_FLFID ? oa->o_parent_seq : 0ULL,
1854                 oa->o_valid & OBD_MD_FLFID ? oa->o_parent_oid : 0,
1855                 oa->o_valid & OBD_MD_FLFID ? oa->o_parent_ver : 0,
1856                 POSTID(&oa->o_oi),
1857                 (__u64)BD_GET_KIOV(desc, 0).kiov_page->index << PAGE_SHIFT,
1858                 ((__u64)BD_GET_KIOV(desc,
1859                                     desc->bd_iov_count - 1).kiov_page->index
1860                         << PAGE_SHIFT) +
1861                         BD_GET_KIOV(desc, desc->bd_iov_count - 1).kiov_len - 1,
1862                 client_cksum, cksum_type, server_cksum, server_cksum_type);
1863         return 1;
1864 }
1865
1866 int tgt_brw_read(struct tgt_session_info *tsi)
1867 {
1868         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1869         struct ptlrpc_bulk_desc *desc = NULL;
1870         struct obd_export       *exp = tsi->tsi_exp;
1871         struct niobuf_remote    *remote_nb;
1872         struct niobuf_local     *local_nb;
1873         struct obd_ioobj        *ioo;
1874         struct ost_body         *body, *repbody;
1875         struct l_wait_info       lwi;
1876         struct lustre_handle     lockh = { 0 };
1877         int                      npages, nob = 0, rc, i, no_reply = 0;
1878         struct tgt_thread_big_cache *tbc = req->rq_svc_thread->t_data;
1879
1880         ENTRY;
1881
1882         if (ptlrpc_req2svc(req)->srv_req_portal != OST_IO_PORTAL) {
1883                 CERROR("%s: deny read request from %s to portal %u\n",
1884                        tgt_name(tsi->tsi_tgt),
1885                        obd_export_nid2str(req->rq_export),
1886                        ptlrpc_req2svc(req)->srv_req_portal);
1887                 RETURN(-EPROTO);
1888         }
1889
1890         req->rq_bulk_read = 1;
1891
1892         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_READ_BULK))
1893                 RETURN(-EIO);
1894
1895         OBD_FAIL_TIMEOUT(OBD_FAIL_OST_BRW_PAUSE_BULK, cfs_fail_val > 0 ?
1896                          cfs_fail_val : (obd_timeout + 1) / 4);
1897
1898         /* Check if there is eviction in progress, and if so, wait for it to
1899          * finish */
1900         if (unlikely(atomic_read(&exp->exp_obd->obd_evict_inprogress))) {
1901                 /* We do not care how long it takes */
1902                 lwi = LWI_INTR(NULL, NULL);
1903                 rc = l_wait_event(exp->exp_obd->obd_evict_inprogress_waitq,
1904                          !atomic_read(&exp->exp_obd->obd_evict_inprogress),
1905                          &lwi);
1906         }
1907
1908         /* There must be big cache in current thread to process this request
1909          * if it is NULL then something went wrong and it wasn't allocated,
1910          * report -ENOMEM in that case */
1911         if (tbc == NULL)
1912                 RETURN(-ENOMEM);
1913
1914         body = tsi->tsi_ost_body;
1915         LASSERT(body != NULL);
1916
1917         ioo = req_capsule_client_get(tsi->tsi_pill, &RMF_OBD_IOOBJ);
1918         LASSERT(ioo != NULL); /* must exists after tgt_ost_body_unpack */
1919
1920         remote_nb = req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE);
1921         LASSERT(remote_nb != NULL); /* must exists after tgt_ost_body_unpack */
1922
1923         local_nb = tbc->local;
1924
1925         rc = tgt_brw_lock(exp->exp_obd->obd_namespace, &tsi->tsi_resid, ioo,
1926                           remote_nb, &lockh, LCK_PR);
1927         if (rc != 0)
1928                 RETURN(rc);
1929
1930         /*
1931          * If getting the lock took more time than
1932          * client was willing to wait, drop it. b=11330
1933          */
1934         if (ktime_get_real_seconds() > req->rq_deadline ||
1935             OBD_FAIL_CHECK(OBD_FAIL_OST_DROP_REQ)) {
1936                 no_reply = 1;
1937                 CERROR("Dropping timed-out read from %s because locking object " DOSTID " took %lld seconds (limit was %lld).\n",
1938                        libcfs_id2str(req->rq_peer), POSTID(&ioo->ioo_oid),
1939                        ktime_get_real_seconds() - req->rq_arrival_time.tv_sec,
1940                        req->rq_deadline - req->rq_arrival_time.tv_sec);
1941                 GOTO(out_lock, rc = -ETIMEDOUT);
1942         }
1943
1944         repbody = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
1945         repbody->oa = body->oa;
1946
1947         npages = PTLRPC_MAX_BRW_PAGES;
1948         rc = obd_preprw(tsi->tsi_env, OBD_BRW_READ, exp, &repbody->oa, 1,
1949                         ioo, remote_nb, &npages, local_nb);
1950         if (rc != 0)
1951                 GOTO(out_lock, rc);
1952
1953         desc = ptlrpc_prep_bulk_exp(req, npages, ioobj_max_brw_get(ioo),
1954                                     PTLRPC_BULK_PUT_SOURCE |
1955                                         PTLRPC_BULK_BUF_KIOV,
1956                                     OST_BULK_PORTAL,
1957                                     &ptlrpc_bulk_kiov_nopin_ops);
1958         if (desc == NULL)
1959                 GOTO(out_commitrw, rc = -ENOMEM);
1960
1961         nob = 0;
1962         for (i = 0; i < npages; i++) {
1963                 int page_rc = local_nb[i].lnb_rc;
1964
1965                 if (page_rc < 0) {
1966                         rc = page_rc;
1967                         break;
1968                 }
1969
1970                 nob += page_rc;
1971                 if (page_rc != 0) { /* some data! */
1972                         LASSERT(local_nb[i].lnb_page != NULL);
1973                         desc->bd_frag_ops->add_kiov_frag
1974                           (desc, local_nb[i].lnb_page,
1975                            local_nb[i].lnb_page_offset,
1976                            page_rc);
1977                 }
1978
1979                 if (page_rc != local_nb[i].lnb_len) { /* short read */
1980                         /* All subsequent pages should be 0 */
1981                         while (++i < npages)
1982                                 LASSERT(local_nb[i].lnb_rc == 0);
1983                         break;
1984                 }
1985         }
1986         if (OBD_FAIL_CHECK(OBD_FAIL_OST_READ_SIZE) &&
1987             nob != cfs_fail_val)
1988                 rc = -E2BIG;
1989
1990         if (body->oa.o_valid & OBD_MD_FLCKSUM) {
1991                 cksum_type_t cksum_type =
1992                         cksum_type_unpack(body->oa.o_valid & OBD_MD_FLFLAGS ?
1993                                           body->oa.o_flags : 0);
1994
1995                 repbody->oa.o_flags = cksum_type_pack(cksum_type);
1996                 repbody->oa.o_valid = OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1997                 repbody->oa.o_cksum = tgt_checksum_bulk(tsi->tsi_tgt, desc,
1998                                                         OST_READ, cksum_type);
1999                 CDEBUG(D_PAGE, "checksum at read origin: %x\n",
2000                        repbody->oa.o_cksum);
2001
2002                 /* if a resend it could be for a cksum error, so check Server
2003                  * cksum with returned Client cksum (this should even cover
2004                  * zero-cksum case) */
2005                 if ((body->oa.o_valid & OBD_MD_FLFLAGS) &&
2006                     (body->oa.o_flags & OBD_FL_RECOV_RESEND))
2007                         check_read_checksum(desc, &body->oa, &req->rq_peer,
2008                                             body->oa.o_cksum,
2009                                             repbody->oa.o_cksum, cksum_type);
2010         } else {
2011                 repbody->oa.o_valid = 0;
2012         }
2013         /* We're finishing using body->oa as an input variable */
2014
2015         /* Check if client was evicted while we were doing i/o before touching
2016          * network */
2017         if (likely(rc == 0 &&
2018                    !CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2) &&
2019                    !CFS_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_BULK))) {
2020                 rc = target_bulk_io(exp, desc, &lwi);
2021                 no_reply = rc != 0;
2022         }
2023
2024 out_commitrw:
2025         /* Must commit after prep above in all cases */
2026         rc = obd_commitrw(tsi->tsi_env, OBD_BRW_READ, exp, &repbody->oa, 1, ioo,
2027                           remote_nb, npages, local_nb, rc);
2028 out_lock:
2029         tgt_brw_unlock(ioo, remote_nb, &lockh, LCK_PR);
2030
2031         if (desc && !CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2))
2032                 ptlrpc_free_bulk(desc);
2033
2034         LASSERT(rc <= 0);
2035         if (rc == 0) {
2036                 rc = nob;
2037                 ptlrpc_lprocfs_brw(req, nob);
2038         } else if (no_reply) {
2039                 req->rq_no_reply = 1;
2040                 /* reply out callback would free */
2041                 ptlrpc_req_drop_rs(req);
2042                 LCONSOLE_WARN("%s: Bulk IO read error with %s (at %s), "
2043                               "client will retry: rc %d\n",
2044                               exp->exp_obd->obd_name,
2045                               obd_uuid2str(&exp->exp_client_uuid),
2046                               obd_export_nid2str(exp), rc);
2047         }
2048         /* send a bulk after reply to simulate a network delay or reordering
2049          * by a router */
2050         if (unlikely(CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2))) {
2051                 wait_queue_head_t        waitq;
2052                 struct l_wait_info       lwi1;
2053
2054                 CDEBUG(D_INFO, "reorder BULK\n");
2055                 init_waitqueue_head(&waitq);
2056
2057                 lwi1 = LWI_TIMEOUT_INTR(cfs_time_seconds(3), NULL, NULL, NULL);
2058                 l_wait_event(waitq, 0, &lwi1);
2059                 target_bulk_io(exp, desc, &lwi);
2060                 ptlrpc_free_bulk(desc);
2061         }
2062
2063         RETURN(rc);
2064 }
2065 EXPORT_SYMBOL(tgt_brw_read);
2066
2067 static void tgt_warn_on_cksum(struct ptlrpc_request *req,
2068                               struct ptlrpc_bulk_desc *desc,
2069                               struct niobuf_local *local_nb, int npages,
2070                               u32 client_cksum, u32 server_cksum,
2071                               bool mmap)
2072 {
2073         struct obd_export *exp = req->rq_export;
2074         struct ost_body *body;
2075         char *router = "";
2076         char *via = "";
2077
2078         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
2079         LASSERT(body != NULL);
2080
2081         if (req->rq_peer.nid != desc->bd_sender) {
2082                 via = " via ";
2083                 router = libcfs_nid2str(desc->bd_sender);
2084         }
2085
2086         if (exp->exp_obd->obd_checksum_dump)
2087                 dump_all_bulk_pages(&body->oa, desc->bd_iov_count,
2088                                     &BD_GET_KIOV(desc, 0), server_cksum,
2089                                     client_cksum);
2090
2091         if (mmap) {
2092                 CDEBUG_LIMIT(D_INFO, "client csum %x, server csum %x\n",
2093                              client_cksum, server_cksum);
2094                 return;
2095         }
2096
2097         LCONSOLE_ERROR_MSG(0x168, "%s: BAD WRITE CHECKSUM: from %s%s%s inode "
2098                            DFID" object "DOSTID" extent [%llu-%llu"
2099                            "]: client csum %x, server csum %x\n",
2100                            exp->exp_obd->obd_name, libcfs_id2str(req->rq_peer),
2101                            via, router,
2102                            body->oa.o_valid & OBD_MD_FLFID ?
2103                            body->oa.o_parent_seq : (__u64)0,
2104                            body->oa.o_valid & OBD_MD_FLFID ?
2105                            body->oa.o_parent_oid : 0,
2106                            body->oa.o_valid & OBD_MD_FLFID ?
2107                            body->oa.o_parent_ver : 0,
2108                            POSTID(&body->oa.o_oi),
2109                            local_nb[0].lnb_file_offset,
2110                            local_nb[npages-1].lnb_file_offset +
2111                            local_nb[npages - 1].lnb_len - 1,
2112                            client_cksum, server_cksum);
2113 }
2114
2115 int tgt_brw_write(struct tgt_session_info *tsi)
2116 {
2117         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2118         struct ptlrpc_bulk_desc *desc = NULL;
2119         struct obd_export       *exp = req->rq_export;
2120         struct niobuf_remote    *remote_nb;
2121         struct niobuf_local     *local_nb;
2122         struct obd_ioobj        *ioo;
2123         struct ost_body         *body, *repbody;
2124         struct l_wait_info       lwi;
2125         struct lustre_handle     lockh = {0};
2126         __u32                   *rcs;
2127         int                      objcount, niocount, npages;
2128         int                      rc, i, j;
2129         cksum_type_t             cksum_type = OBD_CKSUM_CRC32;
2130         bool                     no_reply = false, mmap;
2131         struct tgt_thread_big_cache *tbc = req->rq_svc_thread->t_data;
2132         bool wait_sync = false;
2133
2134         ENTRY;
2135
2136         if (ptlrpc_req2svc(req)->srv_req_portal != OST_IO_PORTAL) {
2137                 CERROR("%s: deny write request from %s to portal %u\n",
2138                        tgt_name(tsi->tsi_tgt),
2139                        obd_export_nid2str(req->rq_export),
2140                        ptlrpc_req2svc(req)->srv_req_portal);
2141                 RETURN(err_serious(-EPROTO));
2142         }
2143
2144         if (OBD_FAIL_CHECK(OBD_FAIL_OST_ENOSPC))
2145                 RETURN(err_serious(-ENOSPC));
2146         if (OBD_FAIL_TIMEOUT(OBD_FAIL_OST_EROFS, 1))
2147                 RETURN(err_serious(-EROFS));
2148
2149         req->rq_bulk_write = 1;
2150
2151         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_WRITE_BULK))
2152                 RETURN(err_serious(-EIO));
2153         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_WRITE_BULK2))
2154                 RETURN(err_serious(-EFAULT));
2155
2156         /* pause before transaction has been started */
2157         CFS_FAIL_TIMEOUT(OBD_FAIL_OST_BRW_PAUSE_BULK, cfs_fail_val > 0 ?
2158                          cfs_fail_val : (obd_timeout + 1) / 4);
2159
2160         /* There must be big cache in current thread to process this request
2161          * if it is NULL then something went wrong and it wasn't allocated,
2162          * report -ENOMEM in that case */
2163         if (tbc == NULL)
2164                 RETURN(-ENOMEM);
2165
2166         body = tsi->tsi_ost_body;
2167         LASSERT(body != NULL);
2168
2169         ioo = req_capsule_client_get(&req->rq_pill, &RMF_OBD_IOOBJ);
2170         LASSERT(ioo != NULL); /* must exists after tgt_ost_body_unpack */
2171
2172         objcount = req_capsule_get_size(&req->rq_pill, &RMF_OBD_IOOBJ,
2173                                         RCL_CLIENT) / sizeof(*ioo);
2174
2175         for (niocount = i = 0; i < objcount; i++)
2176                 niocount += ioo[i].ioo_bufcnt;
2177
2178         remote_nb = req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE);
2179         LASSERT(remote_nb != NULL); /* must exists after tgt_ost_body_unpack */
2180         if (niocount != req_capsule_get_size(&req->rq_pill,
2181                                              &RMF_NIOBUF_REMOTE, RCL_CLIENT) /
2182                         sizeof(*remote_nb))
2183                 RETURN(err_serious(-EPROTO));
2184
2185         if ((remote_nb[0].rnb_flags & OBD_BRW_MEMALLOC) &&
2186             (exp->exp_connection->c_peer.nid == exp->exp_connection->c_self))
2187                 memory_pressure_set();
2188
2189         req_capsule_set_size(&req->rq_pill, &RMF_RCS, RCL_SERVER,
2190                              niocount * sizeof(*rcs));
2191         rc = req_capsule_server_pack(&req->rq_pill);
2192         if (rc != 0)
2193                 GOTO(out, rc = err_serious(rc));
2194
2195         CFS_FAIL_TIMEOUT(OBD_FAIL_OST_BRW_PAUSE_PACK, cfs_fail_val);
2196         rcs = req_capsule_server_get(&req->rq_pill, &RMF_RCS);
2197
2198         local_nb = tbc->local;
2199
2200         rc = tgt_brw_lock(exp->exp_obd->obd_namespace, &tsi->tsi_resid, ioo,
2201                           remote_nb, &lockh, LCK_PW);
2202         if (rc != 0)
2203                 GOTO(out, rc);
2204
2205         /*
2206          * If getting the lock took more time than
2207          * client was willing to wait, drop it. b=11330
2208          */
2209         if (ktime_get_real_seconds() > req->rq_deadline ||
2210             OBD_FAIL_CHECK(OBD_FAIL_OST_DROP_REQ)) {
2211                 no_reply = true;
2212                 CERROR("%s: Dropping timed-out write from %s because locking object " DOSTID " took %lld seconds (limit was %lld).\n",
2213                        tgt_name(tsi->tsi_tgt), libcfs_id2str(req->rq_peer),
2214                        POSTID(&ioo->ioo_oid),
2215                        ktime_get_real_seconds() - req->rq_arrival_time.tv_sec,
2216                        req->rq_deadline - req->rq_arrival_time.tv_sec);
2217                 GOTO(out_lock, rc = -ETIMEDOUT);
2218         }
2219
2220         /* Because we already sync grant info with client when reconnect,
2221          * grant info will be cleared for resent req, then fed_grant and
2222          * total_grant will not be modified in following preprw_write */
2223         if (lustre_msg_get_flags(req->rq_reqmsg) & (MSG_RESENT | MSG_REPLAY)) {
2224                 DEBUG_REQ(D_CACHE, req, "clear resent/replay req grant info");
2225                 body->oa.o_valid &= ~OBD_MD_FLGRANT;
2226         }
2227
2228         repbody = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
2229         if (repbody == NULL)
2230                 GOTO(out_lock, rc = -ENOMEM);
2231         repbody->oa = body->oa;
2232
2233         npages = PTLRPC_MAX_BRW_PAGES;
2234         rc = obd_preprw(tsi->tsi_env, OBD_BRW_WRITE, exp, &repbody->oa,
2235                         objcount, ioo, remote_nb, &npages, local_nb);
2236         if (rc < 0)
2237                 GOTO(out_lock, rc);
2238
2239         desc = ptlrpc_prep_bulk_exp(req, npages, ioobj_max_brw_get(ioo),
2240                                     PTLRPC_BULK_GET_SINK | PTLRPC_BULK_BUF_KIOV,
2241                                     OST_BULK_PORTAL,
2242                                     &ptlrpc_bulk_kiov_nopin_ops);
2243         if (desc == NULL)
2244                 GOTO(skip_transfer, rc = -ENOMEM);
2245
2246         /* NB Having prepped, we must commit... */
2247         for (i = 0; i < npages; i++)
2248                 desc->bd_frag_ops->add_kiov_frag(desc,
2249                                                  local_nb[i].lnb_page,
2250                                                  local_nb[i].lnb_page_offset,
2251                                                  local_nb[i].lnb_len);
2252
2253         rc = sptlrpc_svc_prep_bulk(req, desc);
2254         if (rc != 0)
2255                 GOTO(skip_transfer, rc);
2256
2257         rc = target_bulk_io(exp, desc, &lwi);
2258         no_reply = rc != 0;
2259
2260 skip_transfer:
2261         if (body->oa.o_valid & OBD_MD_FLCKSUM && rc == 0) {
2262                 static int cksum_counter;
2263
2264                 if (body->oa.o_valid & OBD_MD_FLFLAGS)
2265                         cksum_type = cksum_type_unpack(body->oa.o_flags);
2266
2267                 repbody->oa.o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
2268                 repbody->oa.o_flags &= ~OBD_FL_CKSUM_ALL;
2269                 repbody->oa.o_flags |= cksum_type_pack(cksum_type);
2270                 repbody->oa.o_cksum = tgt_checksum_bulk(tsi->tsi_tgt, desc,
2271                                                         OST_WRITE, cksum_type);
2272                 cksum_counter++;
2273
2274                 if (unlikely(body->oa.o_cksum != repbody->oa.o_cksum)) {
2275                         mmap = (body->oa.o_valid & OBD_MD_FLFLAGS &&
2276                                 body->oa.o_flags & OBD_FL_MMAP);
2277
2278                         tgt_warn_on_cksum(req, desc, local_nb, npages,
2279                                           body->oa.o_cksum,
2280                                           repbody->oa.o_cksum, mmap);
2281                         cksum_counter = 0;
2282                 } else if ((cksum_counter & (-cksum_counter)) ==
2283                            cksum_counter) {
2284                         CDEBUG(D_INFO, "Checksum %u from %s OK: %x\n",
2285                                cksum_counter, libcfs_id2str(req->rq_peer),
2286                                repbody->oa.o_cksum);
2287                 }
2288         }
2289
2290         /* Must commit after prep above in all cases */
2291         rc = obd_commitrw(tsi->tsi_env, OBD_BRW_WRITE, exp, &repbody->oa,
2292                           objcount, ioo, remote_nb, npages, local_nb, rc);
2293         if (rc == -ENOTCONN)
2294                 /* quota acquire process has been given up because
2295                  * either the client has been evicted or the client
2296                  * has timed out the request already */
2297                 no_reply = true;
2298
2299         for (i = 0; i < niocount; i++) {
2300                 if (!(local_nb[i].lnb_flags & OBD_BRW_ASYNC)) {
2301                         wait_sync = true;
2302                         break;
2303                 }
2304         }
2305         /*
2306          * Disable sending mtime back to the client. If the client locked the
2307          * whole object, then it has already updated the mtime on its side,
2308          * otherwise it will have to glimpse anyway (see bug 21489, comment 32)
2309          */
2310         repbody->oa.o_valid &= ~(OBD_MD_FLMTIME | OBD_MD_FLATIME);
2311
2312         if (rc == 0) {
2313                 int nob = 0;
2314
2315                 /* set per-requested niobuf return codes */
2316                 for (i = j = 0; i < niocount; i++) {
2317                         int len = remote_nb[i].rnb_len;
2318
2319                         nob += len;
2320                         rcs[i] = 0;
2321                         do {
2322                                 LASSERT(j < npages);
2323                                 if (local_nb[j].lnb_rc < 0)
2324                                         rcs[i] = local_nb[j].lnb_rc;
2325                                 len -= local_nb[j].lnb_len;
2326                                 j++;
2327                         } while (len > 0);
2328                         LASSERT(len == 0);
2329                 }
2330                 LASSERT(j == npages);
2331                 ptlrpc_lprocfs_brw(req, nob);
2332         }
2333 out_lock:
2334         tgt_brw_unlock(ioo, remote_nb, &lockh, LCK_PW);
2335         if (desc)
2336                 ptlrpc_free_bulk(desc);
2337 out:
2338         if (unlikely(no_reply || (exp->exp_obd->obd_no_transno && wait_sync))) {
2339                 req->rq_no_reply = 1;
2340                 /* reply out callback would free */
2341                 ptlrpc_req_drop_rs(req);
2342                 if (!exp->exp_obd->obd_no_transno)
2343                         LCONSOLE_WARN("%s: Bulk IO write error with %s (at %s),"
2344                                       " client will retry: rc = %d\n",
2345                                       exp->exp_obd->obd_name,
2346                                       obd_uuid2str(&exp->exp_client_uuid),
2347                                       obd_export_nid2str(exp), rc);
2348         }
2349         memory_pressure_clr();
2350         RETURN(rc);
2351 }
2352 EXPORT_SYMBOL(tgt_brw_write);
2353
2354 /* Check if request can be reconstructed from saved reply data
2355  * A copy of the reply data is returned in @trd if the pointer is not NULL
2356  */
2357 bool req_can_reconstruct(struct ptlrpc_request *req,
2358                          struct tg_reply_data *trd)
2359 {
2360         struct tg_export_data *ted = &req->rq_export->exp_target_data;
2361         struct lsd_client_data *lcd = ted->ted_lcd;
2362         bool found;
2363
2364         if (tgt_is_multimodrpcs_client(req->rq_export))
2365                 return tgt_lookup_reply(req, trd);
2366
2367         mutex_lock(&ted->ted_lcd_lock);
2368         found = req->rq_xid == lcd->lcd_last_xid ||
2369                 req->rq_xid == lcd->lcd_last_close_xid;
2370
2371         if (found && trd != NULL) {
2372                 if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE) {
2373                         trd->trd_reply.lrd_xid = lcd->lcd_last_close_xid;
2374                         trd->trd_reply.lrd_transno =
2375                                                 lcd->lcd_last_close_transno;
2376                         trd->trd_reply.lrd_result = lcd->lcd_last_close_result;
2377                 } else {
2378                         trd->trd_reply.lrd_xid = lcd->lcd_last_xid;
2379                         trd->trd_reply.lrd_transno = lcd->lcd_last_transno;
2380                         trd->trd_reply.lrd_result = lcd->lcd_last_result;
2381                         trd->trd_reply.lrd_data = lcd->lcd_last_data;
2382                         trd->trd_pre_versions[0] = lcd->lcd_pre_versions[0];
2383                         trd->trd_pre_versions[1] = lcd->lcd_pre_versions[1];
2384                         trd->trd_pre_versions[2] = lcd->lcd_pre_versions[2];
2385                         trd->trd_pre_versions[3] = lcd->lcd_pre_versions[3];
2386                 }
2387         }
2388         mutex_unlock(&ted->ted_lcd_lock);
2389
2390         return found;
2391 }
2392 EXPORT_SYMBOL(req_can_reconstruct);
2393